CN102537767A - Display backlight module with multiple multilayer film reflectors and manufacturing method for same - Google Patents
Display backlight module with multiple multilayer film reflectors and manufacturing method for same Download PDFInfo
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- CN102537767A CN102537767A CN2010106196718A CN201010619671A CN102537767A CN 102537767 A CN102537767 A CN 102537767A CN 2010106196718 A CN2010106196718 A CN 2010106196718A CN 201010619671 A CN201010619671 A CN 201010619671A CN 102537767 A CN102537767 A CN 102537767A
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Abstract
The invention relates to a display backlight module with multiple multilayer film reflectors and a manufacturing method for the same, in particular to a multilayer film reflector comprising a plurality of mutually overlapped polymer films with different refractivity. A liquid crystal display is provided with the backlight module with the multiple multilayer film reflectors, and light with a specific wavelength range is reflected or penetrated by means of the interference principle applied to the multilayer film reflectors, so that more uniform backlight can be obtained. The display backlight module comprises a backlight source module such as a direct-type or side-type light source, first multilayer film reflectors, second multilayer film reflectors and an optical film, wherein the optical film can be a diffusion film.
Description
Technical field
The present invention relates to a kind of display backlight module and manufacturing approach thereof, particularly be provided with in the display backlight module of multilayer film reflector plate of two or more adjustable light source wave-length coverages with multilayer multilayer film reflector plate.
Background technology
The backlight module that is applied to LCD (LCD) panel can be divided into side direction type (edge type) and straight-down negative (direct type) according to light-source structure.
The structure of side direction type light source as shown in Figure 1, light source itself possibly be negative electrode fluorescent tube (CCFL), or light emitting diode (LED), are arranged at the panel side.The side direction type backlight module that Fig. 1 shows is arranged at display panels 101 belows; Backlight module generally includes the prismatic lens (prism) 102 that helps the light diffusion, the diffusion barrier (diffuser) 103 that helps equalizing light rays and the LGP (light guide plate) 104 of wedge type; 105 of light sources are located at a side of LGP 104, and the below has and can light be reflected the reflecting piece (reflector) 106 that gets into panel in the backlight module.
Wherein, Light is sent by light source 105; Light is interspersed among in the integral display panel through LGP 104, descending light can get in the panel through reflecting piece 106 reflections, and the optical system that up light then can pass through to be made up by diffusion barrier 103 and prismatic lens 102 is with equalizing light rays; Wherein diffusion barrier 103 can reduce the equal problem of light and shade that the light interference produces, and makes that the light that gets into display panels 101 can uniformly light-emitting.Each optical element wherein, like diffusion barrier 103, LGP 104, its surface or the inner particle or structure that can produce some diffusion usefulness through technology through reflection and refraction principle, let light more show mixed and disorderly and promote the effect of homogenising.
Fig. 2 is the direct type backlight module sketch map of prior art.Direct type backlight module is that light sources such as negative electrode fluorescent tube or light emitting diode are directly placed display panels 201 belows, and direct type backlight module includes prismatic lens 202, diffusion barrier 203 that helps equalizing light rays and the lamp box 204 with light source 205 and reflective structure 206 that helps the light diffusion.Be different from the side direction type light source; Directly-down light source can be directly with light directive display panels 201; For asking uniform light source, also need optical elements such as prismatic lens, diffusion barrier equally, the surface of optical element or inside also are the particle or the structures that can produce some diffusion usefulness through technology.
In the prior art, each optical element that is applied in the backlight module can be with reference to United States Patent (USP) the 7th, 763, the optical module of the display that is disclosed for No. 331, and relevant drawings can be with reference to figure 3.
Show a liquid crystal indicator 30 in this example; Wherein main element is the backlight optical module of liquid crystal panel 301 and its below; Comprise the light source 308 of blooming 303, brightness enhancement film (brightness enhancing film) 305, LGP 307 and one of which side in the optical module, LGP 307 belows then have a reflector 309 in order to reflect descending light.
Wherein blooming 303 can be diffusion barrier, reflection polarizing film or another brightness enhancement film.In this example; Brightness enhancement film 305 is arranged between LGP 307 and the liquid crystal panel 301, and in general, liquid crystal panel 301 upper and lower surfaces have light polarizing film; Light is through above-mentioned blooming 303, LGP 307; And light polarizing film, will have consume, the brightness enhancement film 305 (like DBEF, branch light brightness enhancement film (prismatic brightness enhancement film)) that is made up of reflection multilayer polarisation module then helps to improve backlight illumination and can save energy loss.
Prior art:
Blooming 303 brightness enhancement film 305
LGP 307 reflectors 309
Inventive embodiments:
Side direction type backlight module 40 display panels 401
The first multilayer film reflector plate, 403 diffusion barriers 405
Diffusion barrier 406 second multilayer film reflector plates 407 backlight
Side direction type light source 408 LGPs 409
Reflecting piece 410 direct-light-type backlight modules 509
The first multilayer film reflector plate, 503 second multilayer film reflector plates 507
Reflecting piece 510 surface textures 70,62
Diffusion particle 708,709 base materials 711,712
Polymeric optical film 701,703,705,707
Draw direction 911,912,913,914
Step S601～S609 backlight module manufacturing approach
Step S801～S807 multilayer film reflector plate manufacturing approach
Summary of the invention
Be the solution that provides to be different from optical element in the prior art backlight module; The present invention proposes a kind of backlight liquid crystal display module that is applied to; Comprising the backlight module of side direction type or straight-down negative, on an exiting surface of backlight module, two or more multilayer film reflector plates are set especially also; The multilayer film reflector plate has different refractivity by multilayer and the high molecular polymer film that is superimposed with each other is formed, and is arranged between backlight module and the display panels.In one embodiment, other has a blooming, like diffusion barrier.
Particularly, the display backlight module according to one aspect of the invention comprises: a side direction type backlight module; One first multilayer film reflector plate; Be arranged between a said side direction type backlight module and the display panels; Have different refractivity and the high molecular polymer film that is superimposed with each other is formed by multilayer, wherein use the principle of interference design reflectivity or penetrate light with particular range of wavelengths; And a diffusion barrier, be attached at a side of this first multilayer film reflector plate, utilize the micro-structural in the film evenly to spread the light that this side direction type backlight module produces.Wherein, this side direction type backlight module comprises again: a side direction type light source; One LGP is coupled to this side direction type light source; One reflecting piece is arranged at a side of this LGP, in order to get into a descending light of this LGP in the light that reflects this side direction type light source; One second multilayer film reflector plate; Be arranged on the exiting surface of this side direction type backlight module; Have different refractivity and the high molecular polymer film that is superimposed with each other is formed by multilayer, wherein use the principle of interference design reflectivity or penetrate light with particular range of wavelengths; Definition one reflecting chamber between this second multilayer film reflector plate and this reflecting piece, light produces multipath reflection, refraction and scattering in this reflecting chamber.
The further improved technical scheme according to the present invention is coated with or extrudes a surface texture on one surface of this first multilayer film reflector plate or this second multilayer film reflector plate.
The further improved technical scheme according to the present invention, this surface texture of this first multilayer film reflector plate or this second multilayer film reflector plate also includes a plurality of diffusion particles.
The further improved technical scheme according to the present invention is pasted with diffusion barrier on this surface of this first multilayer film reflector plate or this second multilayer film reflector plate.
The further improved technical scheme according to the present invention, this lip-deep this diffusion barrier has a plurality of diffusion particles.
The further improved technical scheme according to the present invention also comprises a ultraviolet reflecting layer of uv reflectance in the sandwich construction of this first multilayer film reflector plate or this second multilayer film reflector plate.
The further improved technical scheme according to the present invention, this first multilayer film reflector plate or this second multilayer film reflector plate are made through a uniaxial extension technology.
The further improved technical scheme according to the present invention, this first multilayer film reflector plate or this second multilayer film reflector plate after this uniaxial extension technology, in the average penetration rate of spectrum 400nm～700nm between 30% and 90%.
The further improved technical scheme according to the present invention, this first multilayer film reflector plate or this second multilayer film reflector plate are made through a twin shaft extension process.
The further improved technical scheme according to the present invention, this first multilayer film reflector plate or this second multilayer film reflector plate be behind this twin shaft extension process, in the average penetration rate of spectrum 400nm～700nm between 30% and 90%.
The further improved technical scheme according to the present invention, this first multilayer film reflector plate or this second multilayer film reflector plate are made through a twin shaft extension process, and the multilayer film reflector plate has polarized light property.
The further improved technical scheme according to the present invention, this first multilayer film reflector plate or this second multilayer film reflector plate are made through a twin shaft extension process, and the multilayer film reflector plate does not have polarized light property.
The further improved technical scheme according to the present invention, this display backlight module, be applied to also comprise in the liquid crystal indicator: a direct-light-type backlight module comprises: a light source; One reflector is coupled to this light source, in order to reflect the descending light that this source light produces through refraction; One second multilayer film reflector plate; Be arranged on the exiting surface of this direct-light-type backlight module; Have different refractivity and the high molecular polymer film that is superimposed with each other is formed by multilayer, wherein use the principle of interference design reflectivity or penetrate light with particular range of wavelengths; Definition one reflecting chamber between this multilayer film reflector plate and this reflector, light produces multipath reflection, refraction and scattering in this reflecting chamber; And one first multilayer film reflector plate; Be arranged between this direct-light-type backlight module and the display panels; Have different refractivity and the high molecular polymer film that is superimposed with each other is formed by multilayer, wherein use the principle of interference design reflectivity or penetrate light with particular range of wavelengths; And a diffusion barrier, be attached at a side of this first multilayer film reflector plate, utilize the micro-structural in the film evenly to spread the light that this direct-light-type backlight module produces.
The further improved technical scheme according to the present invention, the light source of this direct-light-type backlight module is a light emitting diode matrix.
The further improved technical scheme according to the present invention; This light emitting diode matrix is by many groups of light emitting diode, the laser diodes with red, green, blue three looks, or the light-emitting component of the light emitting diode of the light emitting diode of blue-light excited fluorescent material or ultraviolet ray excited multicolor phosphor is formed.
The further improved technical scheme according to the present invention is coated with or extrudes a surface texture on one surface of this first multilayer film reflector plate or this second multilayer film reflector plate.
The further improved technical scheme according to the present invention, this surface texture of this first multilayer film reflector plate or this second multilayer film reflector plate also includes a plurality of diffusion particles.
The further improved technical scheme according to the present invention is pasted with diffusion barrier on this surface of this first multilayer film reflector plate or this second multilayer film reflector plate.
The further improved technical scheme according to the present invention, this lip-deep this diffusion barrier has a plurality of diffusion particles.
The further improved technical scheme according to the present invention also comprises a ultraviolet reflecting layer of uv reflectance in the sandwich construction of this first multilayer film reflector plate or this second multilayer film reflector plate.
The further improved technical scheme according to the present invention, this first multilayer film reflector plate or this second multilayer film reflector plate are made through a uniaxial extension technology.
The further improved technical scheme according to the present invention, this first multilayer film reflector plate or this second multilayer film reflector plate be after this uniaxial extension technology, in the average penetration rate of spectrum 400nm～700nm between 30% and 90%.
The further improved technical scheme according to the present invention, this first multilayer film reflector plate or this second multilayer film reflector plate are made through a twin shaft extension process.
The further improved technical scheme according to the present invention, this first multilayer film reflector plate or this second multilayer film reflector plate be behind this twin shaft extension process, in the average penetration rate of spectrum 400nm～700nm between 30% and 90%.
The further improved technical scheme according to the present invention, this first multilayer film reflector plate or this second multilayer film reflector plate are made through a twin shaft extension process, and the multilayer film reflector plate has polarized light property.
The further improved technical scheme according to the present invention, this first multilayer film reflector plate or this second multilayer film reflector plate are made through a twin shaft extension process, and the multilayer film reflector plate does not have polarized light property.
According to a further aspect in the invention, the manufacturing approach that it provides a kind of display backlight module comprises: a display panels is set; One backlight module is set, has a light source and a reflecting element; One first multilayer film reflector plate is set; Fit with this display panels; This first multilayer film reflector plate has different refractivity by multilayer and the high molecular polymer film that is superimposed with each other is formed, utilization principle of interference design reflectivity or penetrate the light with particular range of wavelengths; One second multilayer film reflector plate is set; Fit with this backlight module; This second multilayer film reflector plate has different refractivity by multilayer and the high molecular polymer film that is superimposed with each other is formed, utilization principle of interference design reflectivity or penetrate the light with particular range of wavelengths; And, definition one reflecting chamber between this reflecting element in this second multilayer film reflector plate and this backlight module, light produces multipath reflection, refraction and scattering in this reflecting chamber; And between this first multilayer film reflector plate and this second multilayer film reflector plate, a blooming is set.
The further improved technical scheme according to the present invention, this first multilayer film reflector plate and this second multilayer film reflector plate are by a coextrusion processes made.
The further improved technical scheme according to the present invention, this first multilayer film reflector plate or this second multilayer film reflector plate be also through a uniaxial extension technology, form one have the polarisation effect optical element.
The further improved technical scheme according to the present invention, this first multilayer film reflector plate that this uniaxial extension technology is made or this second multilayer film reflector plate in the average penetration rate of spectrum 400nm～700nm between 30% and 90%.
The further improved technical scheme according to the present invention; This first multilayer film reflector plate and this second multilayer film reflector plate be also through a twin shaft extension process, so as to control through the P polarization of the light of this first multilayer film reflector plate or this second multilayer film reflector plate and the ratio of S polarization.
The further improved technical scheme according to the present invention, this first multilayer film reflector plate that this twin shaft extension process is made or this second multilayer film reflector plate in the average penetration rate of spectrum 400nm～700nm between 30% and 90%.
The further improved technical scheme according to the present invention, this backlight module is a side light type back light source module.
The further improved technical scheme according to the present invention, this backlight module is a direct-light-type backlight module.
The further improved technical scheme according to the present invention, the light source of this direct-light-type backlight module is a light emitting diode matrix, this light emitting diode matrix has red, green, blue three looks by many groups, or the light-emitting component of the light emitting diode of other type is formed.
The further improved technical scheme according to the present invention also forms a surface texture with a coating process on one surface of this first multilayer film reflector plate or this second multilayer film reflector plate.
The further improved technical scheme according to the present invention, this surface texture has a plurality of diffusion particles.
The further improved technical scheme according to the present invention also comprises a ultraviolet reflecting layer that utilizes a coextrusion, coating, sputter or evaporation process to make in the sandwich construction of this multilayer film reflector plate.
Specifically, in general backlight liquid crystal display module, be provided with the blooming that adds lustre to, increases diffusion, the uniformity usually, such as 3M
TMThe reflective brightness enhancement film (DBEF) of company, or some utilize multilayer film to form the blooming of multipath reflection optical path, or utilize surface texture to produce the optical texture of diffusion function.And one of them the multilayer film reflector plate in the display backlight module will replace prior art and be usually used in the 3M in the backlight module
TMThe reflective brightness enhancement film (DBEF) of company cooperates another multilayer film reflector plate can reach the effect of effective mixed light and polarisation, more can use the principle of interference designing institute to reflect or penetrates the light with particular range of wavelengths.
According to embodiment; Have at least the first multilayer film reflector plate and the second multilayer film reflector plate to be arranged at simultaneously in the backlight liquid crystal display module; Principle of interference in the utilization multilayer film reflector plate between the film of multilayer different refractivity stack; Set institute and will reflect or penetrate light with particular range of wavelengths, and can be because light path increases and repeatedly reflects and obtain backlight more uniformly.
The embodiment of display backlight module comprises a backlight module, like the straight-down negative or the light source of side direction type, also comprises above-mentioned first and second multilayer film reflector plate, with another blooming.
With regard to light source; The present invention is special, and proposition can be applicable to the direct-light-type backlight module that light source is a light emitting diode matrix; And this light emitting diode matrix can be main by a plurality of white lights; In addition can select especially to form, comprise that many group red, green, blue three colour cells are closed, the combination of blue light-emitting diode and yellow fluorescent powder by the light emitting diode of many group patterns pattern, or the backlight of the light-emitting component of the light emitting diode of other type composition.
The technology of aforementioned display device backlight module then mainly is provided with a display panels earlier; With a backlight module is set; Two or above multilayer film reflector plate by multilayer has different refractivity and the high molecular polymer film that is superimposed with each other is formed are set therebetween; And the blooming of fitting, being incorporated into afterwards on the surface of display panels, blooming can be a diffusion barrier.
Specifically, the multilayer film reflector plate can be by a coextrusion processes made, more can be through a uniaxial extension technology, form one have polarisation (polarization) effect optical element.Or through the twin shaft extension process, can be so as to control through the P polarization of the light of multilayer film reflector plate and the ratio of S polarization.
Main embodiment having thus described the invention; Particularly the display backlight module of side-light type wherein has the first multilayer film reflector plate, has the ability of reflection particular range of wavelengths light; Organize separately and closed diffusion barrier, be incorporated on another surface of the first multilayer film reflector plate display panels.Include backlight module in the module, wherein optical element mainly contains diffusion barrier backlight, the second multilayer film reflector plate, light source, LGP and reflecting piece.The second multilayer film reflector plate is arranged on the exiting surface of backlight module; The special ability that has reflection particular range of wavelengths light because produce internal intervention; Definition one reflecting chamber between the reflecting element in this second multilayer film reflector plate and the backlight module, light can produce multipath reflection, refraction and scattering in this reflecting chamber.
The above-mentioned first multilayer film reflector plate or the second multilayer film reflector plate are after uniaxial extension technology, and the average penetration rate that can make spectrum 400nm～700nm is between 30% and 90%.
And can process the first multilayer film reflector plate or the second multilayer film reflector plate through a twin shaft extension process, the average penetration rate that makes spectrum 400nm～700nm equally is between 30% and 90%.The wavelength of the 400nm～700nm that describes among the present invention is the general visible light wave range scope of general reference, but everyone eyes structure is variant to the impression meeting of wavelength, and visible wavelength also maybe be slightly toward more long wavelength or more short wavelength's skew.
Other has embodiment to disclose a kind of display backlight module of straight-down negative; Wherein have the first multilayer film reflector plate and another second multilayer film reflector plate between display panels and the light source module simultaneously; Can be provided with other blooming between two multilayer film reflector plates, like diffusion barrier, brightness enhancement film etc.
The manufacturing approach of display backlight module comprises a display panels and a backlight module is set; Has multilayer optical device in display panels and the backlight module; Comprise the first multilayer film reflector plate and the second multilayer film reflector plate are set, and between the first multilayer film reflector plate and the second multilayer film reflector plate, at least one blooming is set.
Description of drawings
Shown in Figure 1 is the structural representation of the side direction type backlight module of prior art;
Shown in Figure 2 is the direct type backlight module sketch map of prior art;
Shown in Figure 3ly be applied to the backlight liquid crystal display module diagram for prior art;
Fig. 4 is the sketch map of display backlight module embodiment one of the present invention;
Fig. 5 is the sketch map of display backlight module embodiment two of the present invention;
Shown in Figure 6 for the process chart of display backlight module of the present invention;
Fig. 7 A, Fig. 7 B and Fig. 7 C are depicted as the structure embodiment sketch map of multilayer film reflector plate of the present invention;
Shown in Figure 8 for the manufacturing approach of multilayer film reflector plate embodiment of the present invention; And
Fig. 9 A is depicted as the sketch map that different multilayer film reflector plates have the different stretch direction in the backlight module of the present invention with Fig. 9 B.
The main element symbol description
The specific embodiment
The present invention proposes a kind of display backlight module and manufacturing approach thereof; Being different from operated by rotary motion has the mode of optical elements such as bright enhancement film, diffusion barrier; Special be provided with two-layer at least by multilayer has different refractivity and the high molecular polymer film that is superimposed with each other is formed multilayer film reflector plate; Each multilayer film reflector plate utilization principle of interference, can through design alternative to reflect or penetrate light with particular range of wavelengths, obtain backlight more uniformly.
With regard to material; The film of above-mentioned high molecular polymer can be selected from group or copolymer or the mixture that following polymer substance is formed: ethylene glycol terephthalate (Polyethylene Terephthalate; PET), polycarbonate (Polycarbonate, PC), Triafol T (Tri-acetyl Cellulose, TAC), polymethyl methacrylate particle (Polymethylmethacrylate; PMMA), MS plastics (Methylmethacrylate styrene), polypropylene (Polypropylene; PP), polystyrene (Polystyrene, PS), polymethyl methacrylate (PMMA) or cyclenes copolymer (Cyclic Olefin Copolymer, COC), PEN (Polyethylene Naphthalate; PEN); Polyvinyl fluoride (Ethylene-Tetrafluoroethylene, ETFE), PLA (Polylactide; PLA), coPEN, coPET, wherein coPET and coPEN then for part PET and part PEN according to copolymer that certain proportion mixed.
The embodiment of display backlight module can be with reference to embodiment sketch map shown in Figure 4, and particularly using has a kind of side direction type backlight module in the display panels.
It shown in the figure backlight module that is arranged at display panels 401 belows; Comprising side direction type backlight module 40 is arranged; Optical element therebetween can include multi-layer optical film, has the first multilayer film reflector plate 403 and diffusion barrier 405 at least, and can be provided with the second multilayer film reflector plate 407 on the exiting surface of side direction type backlight module 40; And in another embodiment, a diffusion barrier 406 backlight can be set on this exiting surface again.The optical thin film structure generation diffusion of forming and the effect of adding lustre to that wherein have different refractivity especially through the multilayer in the newly-increased multilayer film reflector plate 403 and 407.
Have two groups of multilayer film reflector plates 403,407 in the above-mentioned module at least, this has the structure that the different refractivity film is superimposed with each other for multilayer, can be with reference to the description of Fig. 7 A to Fig. 7 C of the present invention.One side of side direction type backlight module 40 is provided with side direction type light source 408, is coupled to a LGP 409, gets into backlight module so as to directing light, and below (side of LGP 409) also is provided with the reflecting piece 410 of reflection ray.
Wherein, LGP 409 effectively guides light source 408 to get into side direction type backlight module 40 through inner design with surface texture; Light traveling process therein maybe be towards the up directive second multilayer film reflector plate 407, and the descending light that produces through refraction then need be got in the backlight module 40 by reflecting piece 410 reflections again.
Specifically, the first multilayer film reflector plate 403 is arranged at than the position near display panels 401, and the second multilayer film reflector plate 407 then is arranged in the side direction type backlight module 40, and the diffusion barrier backlight 406 of assisting diffused light source wherein can be set simultaneously.Diffusion barrier 406 main purposes backlight here provide support and all effects of light are provided, and diffusion barrier 406 materials backlight generally can be materials such as PC, PMMA, MS or PS, and thickness is about 500um～6mm.
Diffusion barrier 406 can be a structural type or adds the diffusion barrier of granule proliferation; Diffusion barrier 406 is attached at a side of the first multilayer film reflector plate 403; Utilize the micro-structural in the film evenly to spread the light that side direction type backlight module 40 produces, reach the purpose of diffusion light with the micro-structural in the film.Diffusion barrier 406 combines with multilayer film reflector plate 407, can produce better evenly effect
In the side direction type backlight module 40; Except the diffusion barrier 406 backlight and the second multilayer film reflector plate 407, also auxiliary have reflecting piece 410, defines a reflecting chamber therebetween; Light can produce multipath reflection, refraction and scattering in this cavity, increase light path and the purpose of reaching homogenising whereby.
The above-mentioned first multilayer film reflector plate 403 and the second multilayer film reflector plate 407 will provide a plurality of optical paths that repeatedly reflect and penetrate, because structure is thinner, and can the too many energy of loss.The multilayer film reflector plate 403,407 whereby, except producing the effect of equalizing light rays, also cause the effect of adding lustre to because the multilayer film generation is reflected, penetrates.Can use wherein principle of optical interference selection reflection especially or penetrate light, the light of specific wavelength section is passed through, or make the light reflection of other wavelength section with particular range of wavelengths.Can the arrange in pairs or groups design of multilayer film reflector plate of structure of the present invention produces different designs, comprises the polarisation effect that produces through extension process, or to each P light and S polarisation of light proportional difference, or the design of polarization direction, all can make according to demand.
In another embodiment; In the manufacturing process of above-mentioned multilayer optical film; The ultraviolet reflecting layer (not being shown among the figure) that can add uv reflectance (UV) especially in order to the unnecessary ultraviolet ray of reflection by the light source generation, and can be made when extruding or be coated on other optical thin film.In this embodiment; Be different from other and use the practice that absorbs ultraviolet material; This ultraviolet reflecting layer can reflect by light emitting diode (LED), laser diode (Laser diode), the cold-cathode tube ultraviolet rays that light source produced such as (CCFL), and can utilize again.When light source is semiconductor light sources such as laser diode or light emitting diode, more can utilize the several layers of ultraviolet function of optical thin films ability usable reflection to promote the efficient of light emitting diode.Common main semiconductor white light source mainly contains following three kinds of modes at present: one, form the white-light emitting module with red bluish-green Tricolor LED crystal grain; Have high-luminous-efficiency, high color rendering advantage; But also different simultaneously, thereby make voltage characteristic also different thereupon because of different colours crystal grain epitaxial material.Therefore make that cost is higher, control circuit complex design and mixed light be difficult for.Two, propose to excite yellow YAG (Y3Al5O12:Ce for a day inferior chemistry with blue light-emitting diode; Yttrium-aluminium-garnet) fluorescent material produces white light emitting diode, is existing market main flow mode.Japan's day inferior chemical white light emitting diode of being developed; Be to fill the optical cement that is mixed with gold-tinted YAG fluorescent material in the periphery of blue LED chip; The wavelength of blue light that this blue LED chip sends is about 400-530nm, and the light that utilizes blue LED chip to send excites gold-tinted fluorescent material to produce sodium yellow.But the blue light that also has part simultaneously emits, and this part blue light cooperates goes up the sodium yellow that fluorescent material is sent, and promptly forms the white light of blue yellow two wavelength that mix.Yet the white light emitting diode that this kind utilizes blue LED chip and gold-tinted phosphor combination to form has following several deficiencies: one, because blue light accounts for the major part of luminescent spectrum, therefore, have the higher and uneven phenomenon of colour temperature.For these reasons, must improve the chance of blue light and the effect of gold-tinted fluorescent material, to reduce the blue light strength or the intensity of raising gold-tinted.Two,, and then cause the control of white light source color to be difficult for because the blue light-emitting diode emission wavelength can change with temperature increase.Three, because of luminous red spectrum a little less than, cause the relatively poor phenomenon of color rendering (color rendition).
The another kind of mode that obtains white light is that radium-shine or ultraviolet LED excites to contain in the transparent optical cement and evenly is mixed with a certain proportion of blueness, green, red fluorescence powder with ultraviolet ray, can obtain the white light that three-wavelength mixes after exciting.Three wavelengh white light light-emitting diode has the high color rendering advantage, but the not enough shortcoming of luminous efficiency is arranged.At present white light LEDs forms with the fluorescent material collocation with ultraviolet ray (UV) or blue chip, and its drawback is that luminosity is not enough difficult with uniformity control.Industrial quarters is to increase light transmittance and to derive or draw out the problem that more how available luminous quantity solves the light-emitting diode luminance deficiency from crystal grain at present.For example use transparent conductive material with the amount of light that increases crystal grain, change crystal grain extension or electrode structural designs so that draw out more how available luminous quantity.
In addition when using ultraviolet LED to make the light source of excited white light, because of the shorter injury to human eye of ultraviolet wavelength is bigger, must being barred from the white-light LED structure ultraviolet ray also, shielding of ultraviolet leaks outside.Be not to be provided with to absorb ultraviolet absorbent in the multilayer film reflector plate of the present invention; But the function that ultraviolet reflecting layer can just reach increases optical efficiency is set in the multilayer film reflector plate; Especially for the white light LEDs that ultraviolet LED inspired that uses high color rendering direct help is arranged more; This technology is applied to can increase in the backlight in the liquid crystal display device module LED luminous efficiency and promotes back light source brightness, and can reduce led color improves color to the susceptibility of variations in temperature stability.
For instance; If light source is the combination of blue light-emitting diode (LED) and yellow fluorescent powder; The ultraviolet reflection that above-mentioned ultraviolet reflecting layer can produce light source is in backlight module, and row reflection and going out again not only can not influence other optical element; Also can reuse and excite LED fluorescent material, also can increase the luminous efficiency of LED.In the above-mentioned appearance attitude of utilizing ultraviolet ray excited generation white light; The part of fluorescent material can be considered adding can be by ultraviolet ray excited composition; That is to say; Blending together white light generally will have two kinds of primary colours, and the frequency spectrum (excitation spectrum) that excites of the fluorescent material in this example contains more than two crests at least, just possibly excited the generation white light by the ultraviolet ray except the light of script light emitting diode.
Other optical element, the blooming like diffusion barrier 405 or 406 etc. then can then be incorporated on the surface of the first multilayer film reflector plate 403 or the second multilayer film reflector plate 407, receives through the multilayer film reflector plate and produces light uniformly.Diffusion barrier 405 or 406 mainly is through its surface texture or particle, or built-in granule proliferation in the technology, or inner packet contains the chaotic path that gets into light of mode of bubble etc., produces the effect of diffusion.
Another directly-down light source can be with reference to the sketch map of display backlight module embodiment two of the present invention shown in Figure 5.
In this example, also include the second multilayer film reflector plate 507 on the direct-light-type backlight module 509 that light source 508, reflecting piece 510 are formed.Wherein, reflector 510 is coupled to light source 508, the main descending light that produces through refraction in order to the light of reflection source 508.
The first multilayer film reflector plate 503 is arranged between direct-light-type backlight module 509 and the display panels 501.507 of the second multilayer film reflector plates are arranged on the exiting surface of direct-light-type backlight module 509; And and definition one reflecting chamber between the reflecting element in the direct-light-type backlight module 509 (reflecting piece 510); Light can produce multipath reflection, refraction and scattering in this cavity, increase light path and the purpose of reaching homogenising whereby.
Multilayer film reflector plate as the multilayer in the backlight module that is applied to the side direction type light source; The above-mentioned first multilayer film reflector plate 503 and the second multilayer film reflector plate 507 will provide a plurality of optical paths that repeatedly reflect and penetrate; Can produce the effect of equalizing light rays whereby, and cause the effect of adding lustre to because the multilayer film generation is reflected, penetrates.And can use wherein principle of optical interference selection reflection or penetrate light, the light of specific wavelength section is passed through, or make the light reflection of other wavelength section with particular range of wavelengths.
In this example; Can select one one or more diffusion barrier is set, like first diffusion barrier 505 or second diffusion barrier 506, the use of maybe can arranging in pairs or groups; Diffusion barrier will be attached at a side of the first multilayer film reflector plate 503, utilize the micro-structural in the film evenly to spread the light that this direct-light-type backlight module produces
What deserves to be mentioned is that the light source of this direct-light-type backlight module can be a light emitting diode matrix, preferred embodiment many groups of serving as reasons have red, green, blue three looks, or the light emitting diode matrix formed of the light-emitting component of the combination of other light emitting diode.
The process chart of the invention described above display backlight module can be with reference to figure 6.
Step begins like S601, and a display panels is set, and S603 is provided with backlight module with step, and backlight module comprises the backlight module of side direction type or two kinds of kenels of directly-down light source.
Then, the first multilayer film reflector plate is set, this has different refractivity by multilayer and the high molecular polymer film that is superimposed with each other is formed the first multilayer film reflector plate and display panels applying like step S605.
Blooming then is set, particularly between the first multilayer film reflector plate and the following square structure, can be a kind of blooming (step S607) that makes the homodisperse diffusion barrier of light source, brightness enhancement film or other type have specific function.
At the exiting surface of backlight module, promptly upper surface is provided with the second multilayer film reflector plate (step S609) among the figure, utilizes wherein multi-layer film structure to produce to interfere and repeatedly reflects to form evenly backlightly, and can select the optical wavelength that need penetrate or reflect.
Above-mentioned process application is in the display backlight module with side direction type or directly-down light source.Specifically, the second multilayer film reflector plate that above-mentioned steps S609 forms can be integrated in the side direction type backlight module, be all the part of backlight module, also can mend into other blooming diffusion barrier backlight (406) as shown in Figure 4; And in the display backlight module of directly-down light source, first and second multilayer film reflector plate, or more multilayer multilayer film reflector plate will be arranged between backlight module and the display panels together.
The structure of above-mentioned first and second multilayer film reflector plate is the high low-refraction order stack of multilayer and closes and form; Superimposed polymeric optical film 701,703,705 shown in sketch map such as Fig. 7 A; 707; And in fact the inner layer high molecule blooming of the multilayer film reflector plate number of plies of being piled up can be by tens of layers more than hundreds of layers, and only illustrate sandwich construction in scheming, hundreds of layers the structure of not drawing.Multi-layer film structure forms interference condition, can make light therein through repeatedly reflection row ejaculation again, and the effect of homogenising light source is arranged; Also can and go out, the effect of adding lustre to is arranged the capable again reflection of the light that reflects.Change its optical characteristics through extension degree in integral multi-layered film reflector plate thickness, the material and technology, can design according to actual demand.The characteristic of multilayer film reflector plate can be adjusted according to demand especially, and particularly after single shaft or twin shaft extension process, can make spectrum is that the penetrance of light of 400nm～700nm is between 30% and 90%.
When light source is made up of multiple color; As using by the multi-colored led light source of forming of RGB; The normal uneven color spot phenomenon of colour mixture that takes place; Be called moire (MURA), the multilayer film reflector plate can utilize single shaft or twin shaft extension process can effectively adjust the ratio of P and S polarization state, also can only utilize twin shaft to extend the light that adjustment produces no polarization state; When light will just can increase the briliancy uniformity of backlight module and the uniformity reduction MURA phenomenon of color effectively with the light light path lengthening of each light source during interreflection among multilayer film reflector plate and reflector plate and optical module.
The multilayer film reflector plate is except above-mentioned multi-layer film structure; In another embodiment; Also comprise the ultraviolet reflecting layer that utilizes coextrusion processes or coating process to make; Wherein can add the light-passing plastic particle of uv reflectance and make this ultraviolet reflecting layer, make it to be formed in the multilayer film reflector plate.Other technology also can comprise with multilayer film sputter (sputtering) or vapor deposition (evaporation) uvioresistant film fits with the multilayer film reflector plate on this multilayer film reflector plate or after being plated on the base material again.
In the manufacturing, specifically, when the multilayer film reflector plate forms; Can pass through the single shaft direction or the extension process of biaxially oriented again, comprise machine or manual tension, make inner high molecular strand and alignment structure change; Change the characteristic of its physical characteristic, particularly polarisation.
As after utilizing uniaxial extension (uniaxial extension multiplying power can reach 1.5 to 6 times, even bigger multiplying power is looked demand and thin-film material and decided); Wherein thin-film material comprise ethylene glycol terephthalate (Polyethylene Terephthalate, PET), polycarbonate (Polycarbonate, PC), Triafol T (Tri-acetyl Cellulose; TAC), polymethyl methacrylate particle (Polymethylmethacrylate; PMMA), MS plastics (Methylmethacrylate styrene), polypropylene (Polypropylene, PP), polystyrene (Polystyrene, PS), polymethyl methacrylate (PMMA) or cyclenes copolymer (Cyclic Olefin Copolymer; COC), PEN (Polyethylene Naphthalate; PEN), and polyvinyl fluoride (Ethylene-Tetrafluoroethylene, ETFE); PLA (Polylactide, PLA).Optical element after uniaxial extension technology can have the polarisation effect of specific direction, and can be so as to adjusting the wavelength of light scope of its polarization.
If the twin shaft extension process (twin shaft extends the diaxon extension ratio can be inequality, also can be in regular turn twin shaft or simultaneously twin shaft extend), except adjusting the wave-length coverage, more can control through the P polarization of the light of multilayer film reflector plate and the ratio of S polarization.And can cooperate with the characteristic of other blooming (like above-mentioned diffusion barrier and bright enhancement film), make whole backlight module have more homogenising, diffusion, color difference eliminating, adjustment polarization state, adjustment reflectivity, reduce moire (MURA) and the light that can utilize principle of interference adjustment particular range of wavelengths.
Embodiment sees also the structure embodiment sketch map that Fig. 7 B and Fig. 7 C are depicted as multilayer film reflector plate of the present invention again.
Multilayer film reflector plate shown in Fig. 7 B is outside structuring polymer optical thin film 701,703,705,707, and (upper surface or surface below in like figure) goes up to utilize and extrude or coating process (coating) formation surface texture 70 in a surface.Surface texture 70 generally can be length or width is formed between the microstructured bodies of 5um～100um approximately; The microstructured bodies shape of forming surface texture 70 often is spherical (sphere), hemispherical, rhombus (prism) or pyramid (pyramid) etc., or is made up of the various structures that can spread light.The distribution of microstructured bodies can become even or chaotic uneven distribution, to avoid with the folded line phenomenon (Moir é pattern) of the overlapping generation of other element.The function of surface texture 70 be can be chaotic the optical path of light after penetrating, increase light path, can increase the light uniformity.Also can in the technology of making surface texture 70, increase diffusion particle 708 in addition; Increase the diffusivity of light; Diffusion particle 708 can be selected from the macromolecule of acryl, silica or titanium dioxide and so on; Purpose is to cause light refraction and scattering by different refractivity difference, and the shape of particle also can have strip or approaching oval or circular, and diffusion particle 708 can be mixed in the employed optical cement of coating inside.
The both sides of the polymeric optical film of multilayer film reflector plate shown in Fig. 7 C 701,703,705,707 utilize optical cement (optical glue) applying base material 711,712; Comprise above-mentioned upper surface and opposite side lower surface; So as to all making surface texture 70,62 through coating process in both sides up and down; And in like manner can form diffusion particle 708,709 simultaneously, can increase the diffusivity of multilayer film reflector plate whereby.In this example; Surface texture 70 (the lamination process capable of using of can fitting of top; Lamination) diffusion barrier in display backlight module of the present invention or other blooming form holistic optical element, such as on the upper surface of each multilayer film reflector plate, attaching first diffusion barrier; On lower surface, attach second diffusion barrier, and in optical elements such as first diffusion barrier and second diffusion barrier, all can have a plurality of diffusion particles.
The above-mentioned base material 711,712 that is used to form surface texture is as the plastics that support the multilayer film reflector plate structure; It can be polycarbonate (PC), polypropylene (Polypropylene; PP), the PS plastics (Polystyrene, PS), the blue or green butadiene styrene (ABS) of polymethyl methacrylate (PMMA), MS plastics (Methylmethacrylate styrene), propylene, PETG (PET), polyacetals plastics (Polyoxymethylene, POM), nylon (Nylon), PEN (Polyethylene Naphthalate; PEN); Or the CoPEN that blendes together of PET and PEN certain proportion or CoPET polyvinyl fluoride (Ethylene-Tetrafluoroethylene, ETFE), PLA (Polylactide; Material such as PLA), but do not exceed with above-mentioned.
Shown in Figure 8 for the manufacturing approach of multilayer film reflector plate embodiment of the present invention.
Like step S801; Utilize coextrusion processes (co-extrusion) to make the multilayer film reflector plate that forms by the layer high molecule film; Wherein capable of using one or most platform extruder respectively the macromolecular material of multiple different materials to be delivered into a co-extrusion die head inner, after extruding, can experience cooling and shaping, draw and step such as get and block; Like step S803, form the multilayer film reflector plate.
Can before extruding back, typing, adopt online (online) uniaxial extension technology therebetween, or after off-line (offline) is received film, carry out a uniaxial extension technology, the optical element that formation one has the polarisation effect; Or online or off-line execution twin shaft extension process; So as to control through the P polarization of the light of this multilayer film reflector plate and the ratio of S polarization; Or the multilayer film reflector plate (step S805) of the characteristic of the no tool polarisation of formation; Extension process changes multilayer film reflector plate physical characteristic, and generation can be to the optical element of particular range of wavelengths light reflection, and the extension ratio according to single shaft or twin shaft changes polarization effect simultaneously.At last, more can on the multilayer film reflector plate, form surface texture (step S807).
Fig. 9 A is depicted as the sketch map that different multilayer film reflector plates have the different stretch direction in the backlight module of the present invention with Fig. 9 B.
After the multilayer film reflector plate is through extension process (stretching); Wherein molecule in the material or the particle that other extra interpolation arranged are at the draw direction that is produced in the process of stretching than systematicness; The outrigger shaft (stretching axis) that produces whereby has obvious difference with vertical this axial optical activity, produces the effect of polarisation.
Like Fig. 9 A, wherein show one group of backlight module sketch map, include backlight module 901, the first multilayer film reflector plate 903, diffusion barrier 905, the second multilayer film reflector plate 907 and display panels 909.According to this embodiment, wherein the first multilayer film reflector plate 903 and the second multilayer film reflector plate 907 have been introduced extension process shown in Figure 8 in the process of making, through the twin shaft extension of uniaxial extension or different proportion; The first multilayer film reflector plate 903 has different directions with the molecules align of the second multilayer film reflector plate 907; Be respectively the draw direction 911,912 among the figure, whereby the design of extension process; Make two multilayer film reflector plates 903; 907 have different characteristic, when this backlight module of light penetration, produce different effects.
It is two-layer up and down that Fig. 9 B shows that then above-mentioned first multilayer film reflector plate 903 and 907 designs of the second multilayer film reflector plate are positioned at, and different draw direction 913,914 is arranged respectively, even be not the design of vertical direction.So; The first multilayer film reflector plate 903 and the second multilayer film reflector plate 907 are designed with different optical characteristics; As the polarization effect of different directions is arranged after stretched, its polarization direction can be asymmetric, or rotate an angle; And can different polarization ratios be arranged, even produce the different light effects that penetrates through the design of different-thickness to different polarization light (P light, S light).The blooming of different layers has different draw direction 913,914 among the figure, and an angle is arranged.
Comprehensive foregoing, the display backlight module that the present invention proposes is provided with two or more by the multilayer film reflector plate that multilayer different refractivity film is formed by stacking especially except the diffusion barrier with diffusion effect, following a few specific character is arranged:
1. the first multilayer film reflector plate and the second multilayer film reflector plate are arranged in the backlight liquid crystal display module simultaneously; Principle of interference in the utilization multilayer film reflector plate between the film of multilayer different refractivity stack; Set institute and will reflect or penetrate light with particular range of wavelengths, and can be because light path increases and repeatedly reflects and obtain backlight more uniformly;
2. define a reflecting chamber between the reflecting piece (reflector) in the first multilayer film reflector plate and the backlight module, light can produce physical phenomenons such as multipath reflection, refraction, scattering in this cavity, increases the path of mixed light whereby, reaches the function of homogenising;
3. the design of the first multilayer film reflector plate and the second multilayer film reflector plate is two-layer about being positioned at, and its polarization direction can be asymmetric, or rotate an angle;
4. the penetrance of multilayer film reflector plate can change by the multiple condition of the material of plural layers, thickness, extension;
5. by control reflectivity and penetrance, after diffusion barrier collocation use, can adjust the state of the MURA of light source, can assist diffusion barrier and LGP to increase inhomogeneity function, make this display backlight module produce more uniform light;
6. can adjust the physical characteristic of laminated reflective film by the technology of uniaxial extension, make that the light under different polarization states has different reflectivity and refractive index, by the reflectivity and the penetrance of this multilayer film reflector plate of adjustment;
7. the multilayer film reflector plate of at least two groups is arranged in pairs or groups each other, can design the effect that produces the different optical characteristic, comprises the light that produces special polarization state, the P light and the S light of different polarization ratio;
8. the multilayer film reflector plate that extends through twin shaft can be designed to not have the film of polarisation effect, but can design the film with reflection and filter effect;
9. alternative one deck ultraviolet reflecting layer of making in the multilayer film reflector plate, makes it and can utilize again by the unnecessary ultraviolet ray that light source produces so as to reflection, excites the specific composition in the LED fluorescent material, to increase luminous efficiency.
The above is merely preferred possible embodiments of the present invention, and is non-so promptly limit to claim of the present invention, so the equivalent structure that uses specification of the present invention and accompanying drawing content to do such as changes, all in like manner is contained in the scope of the present invention.
Claims (38)
1. display backlight module is applied to comprise in the liquid crystal indicator:
One side direction type backlight module comprises:
One side direction type light source;
One LGP is coupled to said side direction type light source;
One reflecting piece is arranged at a side of said LGP, in order to get into a descending light of said LGP in the light that reflects said side direction type light source;
One second multilayer film reflector plate; Be arranged on the exiting surface of said side direction type backlight module; Have different refractivity and the high molecular polymer film that is superimposed with each other is formed by multilayer, wherein use the principle of interference design reflectivity or penetrate light with particular range of wavelengths; Definition one reflecting chamber between said second multilayer film reflector plate and said reflecting piece, light produces multipath reflection, refraction and scattering in said reflecting chamber; And
One first multilayer film reflector plate; Be arranged between a said side direction type backlight module and the display panels; Have different refractivity and the high molecular polymer film that is superimposed with each other is formed by multilayer, wherein use the principle of interference design reflectivity or penetrate light with particular range of wavelengths; And
One diffusion barrier is attached at a side of the said first multilayer film reflector plate, utilizes the even light that produces of the said side direction type backlight module of diffusion of micro-structural in the film.
2. display backlight module according to claim 1 wherein, is coated with or extrudes a surface texture on the surface of said first multilayer film reflector plate or the said second multilayer film reflector plate.
3. display backlight module according to claim 2, wherein, the said surface texture of said first multilayer film reflector plate or the said second multilayer film reflector plate also includes a plurality of diffusion particles.
4. display backlight module according to claim 2 wherein, is pasted with diffusion barrier on the said surface of said first multilayer film reflector plate or the said second multilayer film reflector plate.
5. display backlight module according to claim 4, wherein, said lip-deep said diffusion barrier has a plurality of diffusion particles.
6. display backlight module according to claim 1 wherein, also comprises a ultraviolet reflecting layer of uv reflectance in the sandwich construction of said first multilayer film reflector plate or the said second multilayer film reflector plate.
7. display backlight module according to claim 1, wherein, said first multilayer film reflector plate or the said second multilayer film reflector plate are made through a uniaxial extension technology.
8. display backlight module according to claim 7, wherein, said first multilayer film reflector plate or the said second multilayer film reflector plate after said uniaxial extension technology, in the average penetration rate of spectrum 400nm～700nm between 30% and 90%.
9. display backlight module according to claim 1, wherein, said first multilayer film reflector plate or the said second multilayer film reflector plate are made through a twin shaft extension process.
10. display backlight module according to claim 9, wherein, said first multilayer film reflector plate or the said second multilayer film reflector plate be behind said twin shaft extension process, in the average penetration rate of spectrum 400nm～700nm between 30% and 90%.
11. display backlight module according to claim 1, wherein, said first multilayer film reflector plate or the said second multilayer film reflector plate are made through a twin shaft extension process, and the multilayer film reflector plate has polarized light property.
12. display backlight module according to claim 1, wherein, said first multilayer film reflector plate or the said second multilayer film reflector plate are made through a twin shaft extension process, and the multilayer film reflector plate does not have polarized light property.
13. a display backlight module is applied to comprise in the liquid crystal indicator:
One direct-light-type backlight module comprises:
One light source;
One reflector is coupled to said light source, in order to reflect the descending light that said source light produces through refraction;
One second multilayer film reflector plate; Be arranged on the exiting surface of said direct-light-type backlight module; Have different refractivity and the high molecular polymer film that is superimposed with each other is formed by multilayer, wherein use the principle of interference design reflectivity or penetrate light with particular range of wavelengths; Definition one reflecting chamber between said multilayer film reflector plate and said reflector, light produces multipath reflection, refraction and scattering in said reflecting chamber; And
One first multilayer film reflector plate; Be arranged between a said direct-light-type backlight module and the display panels; Have different refractivity and the high molecular polymer film that is superimposed with each other is formed by multilayer, wherein use the principle of interference design reflectivity or penetrate light with particular range of wavelengths; And
One diffusion barrier is attached at a side of the said first multilayer film reflector plate, utilizes the even light that produces of the said direct-light-type backlight module of diffusion of micro-structural in the film.
14. display backlight module according to claim 13, wherein, the light source of said direct-light-type backlight module is a light emitting diode matrix.
15. display backlight module according to claim 14; Wherein, Said light emitting diode matrix is by many groups of light emitting diode, the laser diodes with red, green, blue three looks, or the light-emitting component of the light emitting diode of the light emitting diode of blue-light excited fluorescent material or ultraviolet ray excited multicolor phosphor is formed.
16. display backlight module according to claim 13 wherein, is coated with or extrudes a surface texture on the surface of said first multilayer film reflector plate or the said second multilayer film reflector plate.
17. display backlight module according to claim 16, wherein, the said surface texture of said first multilayer film reflector plate or the said second multilayer film reflector plate also includes a plurality of diffusion particles.
18. display backlight module according to claim 16 wherein, is pasted with diffusion barrier on the said surface of said first multilayer film reflector plate or the said second multilayer film reflector plate.
19. display backlight module according to claim 18, wherein, said lip-deep said diffusion barrier has a plurality of diffusion particles.
20. display backlight module according to claim 13 wherein, also comprises a ultraviolet reflecting layer of uv reflectance in the sandwich construction of said first multilayer film reflector plate or the said second multilayer film reflector plate.
21. display backlight module according to claim 13, wherein, said first multilayer film reflector plate or the said second multilayer film reflector plate are made through a uniaxial extension technology.
22. display backlight module according to claim 21, wherein, said first multilayer film reflector plate or the said second multilayer film reflector plate be after said uniaxial extension technology, in the average penetration rate of spectrum 400nm～700nm between 30% and 90%.
23. display backlight module according to claim 13, wherein, said first multilayer film reflector plate or the said second multilayer film reflector plate are made through a twin shaft extension process.
24. according to 23 described display backlight modules of claim the; Wherein, Said first multilayer film reflector plate or the said second multilayer film reflector plate be behind said twin shaft extension process, in the average penetration rate of spectrum 400nm～700nm between 30% and 90%.
25. display backlight module according to claim 13, wherein, said first multilayer film reflector plate or the said second multilayer film reflector plate are made through a twin shaft extension process, and the multilayer film reflector plate has polarized light property.
26. display backlight module according to claim 13, wherein, said first multilayer film reflector plate or the said second multilayer film reflector plate are made through a twin shaft extension process, and the multilayer film reflector plate does not have polarized light property.
27. the manufacturing approach of a display backlight module comprises:
One display panels is set;
One backlight module is set, has a light source and a reflecting element;
One first multilayer film reflector plate is set; Fit with said display panels; The said first multilayer film reflector plate has different refractivity by multilayer and the high molecular polymer film that is superimposed with each other is formed, utilization principle of interference design reflectivity or penetrate the light with particular range of wavelengths;
One second multilayer film reflector plate is set; Fit with said backlight module; The said second multilayer film reflector plate has different refractivity by multilayer and the high molecular polymer film that is superimposed with each other is formed, utilization principle of interference design reflectivity or penetrate the light with particular range of wavelengths; And, definition one reflecting chamber between the said reflecting element in said second multilayer film reflector plate and the said backlight module, light produces multipath reflection, refraction and scattering in said reflecting chamber; And
Between said first multilayer film reflector plate and the said second multilayer film reflector plate, a blooming is set.
28. the manufacturing approach of display backlight module according to claim 27, wherein, said first multilayer film reflector plate and the said second multilayer film reflector plate are by a coextrusion processes made.
29. the manufacturing approach of display backlight module according to claim 28, wherein said first multilayer film reflector plate or the said second multilayer film reflector plate be also through a uniaxial extension technology, form one have the polarisation effect optical element.
30. the manufacturing approach of display backlight module according to claim 29; Wherein, said first multilayer film reflector plate of making through said uniaxial extension technology or the said second multilayer film reflector plate in the average penetration rate of spectrum 400nm～700nm between 30% and 90%.
31. the manufacturing approach of display backlight module according to claim 28; Wherein, Said first multilayer film reflector plate and the said second multilayer film reflector plate be more through a twin shaft extension process, so as to control through the P polarization of the light of said first multilayer film reflector plate or the said second multilayer film reflector plate and the ratio of S polarization.
32. the manufacturing approach of display backlight module according to claim 31; Wherein, said first multilayer film reflector plate of making through said twin shaft extension process or the said second multilayer film reflector plate in the average penetration rate of spectrum 400nm～700nm between 30% and 90%.
33. the manufacturing approach of display backlight module according to claim 27, wherein said backlight module are a side light type back light source module.
34. the manufacturing approach of display backlight module according to claim 27, wherein, said backlight module is a direct-light-type backlight module.
35. the manufacturing approach of display backlight module according to claim 34; Wherein, The light source of said direct-light-type backlight module is a light emitting diode matrix; Said light emitting diode matrix has red, green, blue three looks by many groups, or the light-emitting component of the light emitting diode of other type is formed.
36. the manufacturing approach of display backlight module according to claim 27 wherein, also forms a surface texture with a coating process on the surface of said first multilayer film reflector plate or the said second multilayer film reflector plate.
37. the manufacturing approach of display backlight module according to claim 36, wherein, said surface texture has a plurality of diffusion particles.
38. the manufacturing approach of display backlight module according to claim 27 wherein, also comprises a ultraviolet reflecting layer that utilizes a coextrusion, coating, sputter or evaporation process to make in the sandwich construction of said multilayer film reflector plate.
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Application publication date: 20120704 |