CN100570448C

CN100570448C - Liquid crystal indicator and light-emitting device

Info

Publication number: CN100570448C
Application number: CNB2005100996121A
Authority: CN
Inventors: 谢明勋; 王健源
Original assignee: Epistar Corp
Current assignee: Epistar Corp
Priority date: 2004-09-30
Filing date: 2005-08-30
Publication date: 2009-12-16
Anticipated expiration: 2025-08-30
Also published as: CN1825183A

Abstract

The present invention discloses a kind of liquid crystal indicator and comprises a backlight module, and backlight module comprises a ultraviolet light unit, red light unit and blue light unit; One liquid crystal layer is in order to control the transmission of light that this backlight module sends; One filter layer, comprise a plurality of pixels, these a plurality of pixels are made up of at least one green pixel, at least one blue pixel and at least one red pixel, wherein this green pixel includes a material for transformation of wave length, this material for transformation of wave length is through the irradiation of this ultraviolet light unit and produce green glow, and the light that this backlight module sends respectively by this green pixel, this red pixel and this blue pixel produce to should pixel photochromic.The invention also discloses a kind of light-emitting device.

Description

Liquid crystal indicator and light-emitting device

Technical field

The present invention relates to a kind of liquid crystal indicator, it comprises a filter layer and backlight module, comprises a ultraviolet light unit in the backlight module at least, comprises in the filter layer can absorb from the ultraviolet light of ultraviolet light unit and produce the material for transformation of wave length of green glow.

Background technology

LCD belongs to non-self luminous display, therefore, need provide light source by another device, and these light sources are commonly referred to backlight module (Backlight Module).Backlight module generally can be divided into two kinds of forms: directly descend light-source type (Direct Light Type) and side direction light-source type (Edge Light Type); The light source of backlight module uses the fluorescent tube of cold-cathode tube (CCFL) and so on traditionally, yet the color saturation of cold-cathode tube is not good, can't present the realistic colour of picture.

For reaching preferable color saturation, use light emitting diode (Light Emitting Diode; LED) light source as backlight module is present market trend.Light emitting diode has advantages such as volume is little, power consumption is low, the life-span is long, reaction velocity is fast, physical strength is good, is to have one of illuminations of prospect this century.For reproducing various colors, the general white light that uses optical filter will come from backlight module filters to decomposite the three primary colors of color in the LCD, that is red, blue, green three looks form required various colors by trichromatic ratio in each pixel groups of control.And, must include three primary colors in this white light, just filtered out red, blue, green three looks.

The mode of using light emitting diode to form white light has several: (1) blue light-emitting diode cooperates yellow fluorescent powder, the general fluorescent powder that uses yttrium aluminum garnet (YAG), this is to form the most general a kind of means of white light at present, yet this kind white light forms with the institute of mixing of gold-tinted by blue light, its spectrum mainly is positioned at 460nm and two wavelength of 550nm, that is the composition of shortcoming ruddiness and green glow in this kind white light, so, use the LCD of this kind white light can't present the realistic colour of picture.(2) blue light-emitting diode cooperates redness and green emitting phosphor, use blue light-emitting diode excitated red with green emitting phosphor to produce ruddiness and green glow, and with blue light to form white light, crosstalk between red, blue, green three looks that this kind mode is produced yet (Crosstalk) is serious, that is the frequency range of red, blue, green three looks overlaps each other, and causes chroma (Hue) to reduce.(3) ultraviolet LED cooperates redness, blueness and green emitting phosphor, this uses ultraviolet LED to excite fluorescent powder more than three kinds or three kinds to produce red bluish-green three looks simultaneously, only between red, blue, green three looks that this kind mode is produced serious crosstalking also arranged, and the technical level of fluorescent powder of all kinds is also unequal.(4) independent red, blue, the light emitting diode of green three looks, the light emitting diode of independent three looks of use can make the color saturation of LCD reach more than the 105%NTSC as the light source of backlight module, use 1.5 times of LCD of cold-cathode tube for tradition, yet, because the luminescence efficiency difference of the light emitting diode of different colours, need the red of varying number during application, blue, green light emitting diode, generally speaking, the efficient of green LED is relatively poor, and need to use more quantity to balance each other with the light quantity that is produced with other color, but this measure certainly will cause the increase of cost, and the increase of quantity also makes the demand of accommodation space improve, for the electronic product of miniaturization day by day not less than being a big shortcoming.

Summary of the invention

Liquid crystal indicator of the present invention comprises a backlight module, comprises a ultraviolet light unit, red light unit and blue light unit; One liquid crystal layer is in order to control the flux of light that this backlight module sends; One filter layer, comprise a plurality of pixels, these a plurality of pixels are made up of at least one green pixel, at least one blue pixel and at least one red pixel, wherein this green pixel includes a material for transformation of wave length, this material for transformation of wave length is through the irradiation of this ultraviolet light unit and produce green glow, and the light that this backlight module sends respectively by this green pixel, this red pixel and this blue pixel produce to should pixel photochromic.

Preferably, be a light emitting diode one of at least in this ultraviolet light unit, this red light unit and this blue light unit.

For making full use of the light that backlight module sends, this filter layer has a reflection horizon with the light of selective reflecting from backlight module.Preferably, this filter layer comprises a Bragg reflecting layer (Distributed BraggReflector; DBR) with the light of selective reflecting from backlight module.

According to another aspect of the present invention, a kind of light-emitting device is provided, comprise: a smooth diverting device, have a wing teat, an incidence surface and a recess, this recess is away from this incidence surface; With an electrooptical device, comprise a ultraviolet light emission body, and a material for transformation of wave length inspires this incidence surface of green glow directive after this ultraviolet light emission body irradiation.

Description of drawings

Fig. 1 shows the synoptic diagram of embodiments of the invention;

Fig. 2 a～2e shows light diverting device and the surperficial synoptic diagram of optics adjustment in the embodiments of the invention;

Fig. 3 a and 3b show the synoptic diagram that semiconductor light-emitting elements is formed in the embodiments of the invention.

Description of reference numerals

10～liquid crystal indicator; 11～backlight module; 1101～ultraviolet light unit; 1102～red light unit; 1103～blue light unit; 12～mixed light; 13～liquid crystal layer; 14～filter layer; 1401～pixel; 1402～material for transformation of wave length; 1403～green glow; 1404～Bragg reflecting layer; 15～light diverting device; 1501～wing teat; 1502～recess; 1503～incidence surface; 16～optics is adjusted the surface; 1601～the first corrugated arrays; 17～blooming piece; 1701～first surface; 1702～second surface; 18～the second optics are adjusted the surface; 1801～the second dimple arrays; 19～semiconductor light-emitting elements is formed; 1901～composite substrate; 1902～gluing structure; 1903～circuit layout carrier; 1904～electrical contact; 1905～lead; 1906～dented space; 2001～soft sticky stuff layer; 2002～responding layer; 2003～responding layer; 21～planarization layer; 22～reflection horizon.

Embodiment

First embodiment

Fig. 1 shows the structural representation of liquid crystal indicator 10 of the present invention.Should comprise many elements in the liquid crystal indicator 10,, only represent the part that to discuss among the present invention among Fig. 1, close first Chen Ming so for for the purpose of clear.

Comprise a backlight module 11 in the liquid crystal indicator 10.Backlight module 11 provides light source to give liquid crystal indicator 10, because presenting the image of visible wavelength range, liquid crystal indicator 10 gives the user, therefore backlight module 11 generally also need provide the light source of visible-range, and be the complete color that presents real world, backlight module 11 generally need provide white light, and this white light preferably is made up of red, blue and green three primary colors light source, for example: red, blue and green light emitting diode.

Yet, for improving the luminescence efficiency of green glow, use a ultraviolet light emission body in the backlight module 11 of the present invention, as the ultraviolet light unit 1101 among Fig. 1, be preferably a ultraviolet light-emitting diodes (LightEmitting Diode; LED), a kind of material for transformation of wave length 1402 that can absorb ultraviolet light and produce green glow of arranging in pairs or groups (indicating P) to produce green glow, is the light of wavelength between 10～420nm at this so-called ultraviolet light, is preferably 200～420nm.If configuration can produce the red light unit 1102 and blue light unit 1103 of ruddiness and blue light in backlight module 11, then can mix and form white light with the green glow that ultraviolet light unit 1101 and material for transformation of wave length 1402 are produced, wherein, red light unit 1102 preferably also is a light emitting diode with blue light unit 1103, right other light-emitting device, as: fluorescent light, incandescent lamp, Halogen lamp LED etc. also are suitable for.

Material for transformation of wave length 1402 as a fluorescent powder (phosphor) can be excited and be sent green glow by the ultraviolet light that ultraviolet light unit 1101 is sent.If the wavelength coverage of the ultraviolet light that ultraviolet light unit 1101 is sent is between 200～420nm, be preferably 360～400nm, 1402 fluorescent powder that can use alkaline-earth-metal silicate of material for transformation of wave length, preferably use the fluorescent powder of the alkaline-earth-metal silicate of europium activation, the composition of this fluorescent powder is as (SrBaMg) ₂SiO ₄: Eu, it is wide that this kind fluorescent powder can form narrow ripple, for example: less than full width at half maximum (the Full Width Half Maximum of 35nm; FWHM), the full width at half maximum of the green glow that this width is produced less than the InGaN series LED, and form preferable chroma.The Green LightingG400 that similar products like such as Intematix company are produced on the market ^TM/ G380 ^TM/ G360 ^TMThe fluorescent powder of series.

In addition, other fluorescent powder that can go out green glow for ultraviolet excitation is as Ca ₈Mg (SiO ₄) ₄Cl ₂: Eu, Mn, Ba ₂SiO ₄: Eu, Ba ₂MgSi ₂O ₇: Eu, BaAl ₂O ₄: Eu, SrAl ₂O ₄: Eu and BaMg ₂Al ₁₆O ₂₇: Eu etc., excitation wavelength is between 330～420nm.

Ultraviolet light unit 1101, red light unit 1102 and the quantity of blue light unit 1103 depend on brightness, the unit brightness of unit 1101,1102,1103 and the optical design in the backlight module 11 etc. that the size, LCD 10 of LCD 10 is required.And trichromatic collating sequence can be for red bluish-green (ultraviolet light), red green (ultraviolet light) are blue, bluish-green (ultraviolet light) is red, Lan Hong is green (ultraviolet light), green (ultraviolet light) red indigo plant, green (ultraviolet light) Lan Hong, red bluish-green (ultraviolet light) red, red green (ultraviolet light) Lan Hong etc.

In this example, because ultraviolet light is non-visible light, so backlight module 11 emitted mixed lights 12 will only manifest the light after ruddiness and the blue light, that is the light of aubergine series.

At least comprise liquid crystal material and tft layer (Thin Film Transistor in the liquid crystal layer 13; TFT), when a bias voltage puts on the tft layer, the liquid crystal that is applied in the zone of bias voltage will turn to, and be the steering angle of may command liquid crystal by the size of control bias voltage, with the amount of passing through liquid crystal layer of adjusting mixed light 12, that is the light and shade of control LCD 10.The operation of LCD principle is a prior art, and detail section can be with reference to the correlation technique document.

Mixed light 12 arrives at filter layer 14 after by liquid crystal layer 13, filter layer 14 is formed on the glass substrate usually, comprise a plurality of pixels (pixel) 1401 (in Fig. 1, being denoted as R, P, B) in the filter layer 14, usually be one group with at least three pixels, be respectively in order to filter red to produce, blue and green three looks of mixed light 12.

Material for transformation of wave length 1402 (following this pixel is called green pixel (P)) is set in the pixel in the present embodiment in one group of pixel, produces green glow (G) behind the ultraviolet excitation that material for transformation of wave length 1402 is launched via ultraviolet light unit 1101.Two pixels in addition in one group of pixel are respectively red pixel (R) and blue pixel (B), it is respectively redness and blue organic material to be made in the corresponding pixel, to filter out ruddiness and blue light respectively, that is, therefore mixed light 12 will be by filtering through the light of the non-red light wavelength scope in red pixels (R) back, and will be by filtering, through the light of the non-blue light wavelength scope after the blue pixel (B), red pixel (R) will send ruddiness, and blue pixel (B) will be sent blue light.Three primary colors by green pixel (P), red pixel (R) and the formed green glow of blue pixel (B), ruddiness and blue light can be combined into various colors.

Except that using organic material to form red pixel (R) and the blue pixel (B), can also use the fluorescent powder formation red pixel (R) and blue pixel (B) that can go out ruddiness and blue light as ultraviolet excitation.The fluorescent powder that can go out ruddiness for ultraviolet excitation is as Y ₂O ₂S:Eu, Bi, Y ₂O ₃: Eu, Bi, 3.5MgO0.5MgF ₂GeO ₂: Mn ⁴⁺, excitation wavelength is between 330～420nm.The fluorescent powder that can go out blue light for ultraviolet excitation is as BaMg ₂Al ₁₆O ₂₇: Eu, (SrBaCa) ₅(PO ₄) ₃Cl:Eu, Sr ₄Al ₁₄O ₂₅: Eu, excitation wavelength is between 220～330nm.

Each pixel can the non-respective wavelength scope of filtering light, this means that this can't be by the pixel of allowing that it passes through by possibly of the light of filtering, and cause light extraction efficiency to descend, for example, in red pixel (R), be that red pixel (R) absorbs and can't pass through blue pixel (B) and green pixel (P) more most probably by the blue light of filtering and ultraviolet light.For improving the utilization factor of light, a Bragg reflecting layer (Distributed BraggReflector; DBR) 1404 be formed at before the filter layer 1401, light with different wavelength range in the selective reflecting mixed light 12, for example can reflect blue or the Bragg reflecting layer of ultraviolet light in the preceding formation one of red pixel (R), making blue light or ultraviolet light can not be entirely red pixel (R) absorbs, and through entering among blue pixel (B) or the green pixel (P) after the reflection for several times, produce corresponding coloured light, the principle of other pixel is also identical.In addition, because ultraviolet light is reflected by Bragg reflecting layer 1404, penetrate the outside of LCD 10 and can avoid ultraviolet light to overflow.

In addition, still comprise the blooming piece of other kind in the LCD 10, as: prismatic lens (PrismSheet), diffusion sheet (Diffuser), Polarizer (Polarizer) etc.Wherein prismatic lens and diffusion sheet are arranged among the backlight module 11 usually, with so that 1101～1103 of luminescence units send light uniformization and produce needed mixed light 12.Then common and liquid crystal layer 13 collocation of Polarizer are so that enter among the liquid crystal layer 13 after mixed light 12 polarizations again.

Though use ultraviolet excitation material for transformation of wave length 1402 to produce the output efficiency that green glow can improve green glow, but, part in the LCD 10, special in plastic products such as prismatic lens, diffusion sheet, Polarizers, may be easily because of long-time irradiating ultraviolet light deterioration, therefore, for preventing the generation of degradation phenomena, those blooming pieces or plastics preferably adopt can ultraviolet light material.

Other correlation technique data of present embodiment such as U.S. patent application case US2005/0001537A1, US2004/0061810A1, US6,686,691, US6,791,636, US6,844,903, US6,809,781, US6,252,254, US6,255,670, US6,278,135, US6,294,800, EP1138747, WO0189000, WO0189001 record in this paper all in the lump with reference now.

Second embodiment

The optics adjustment surface 16 that backlight module 11 comprises a smooth diverting device 15 and/or has a corrugated array in the present embodiment with guiding, mix and/or disperse light that each luminescence unit 1101～1103 produced towards liquid crystal layer 13, shown in Fig. 2 a.

Shown in Fig. 2 b, light diverting device 15 has wing teat 1501, recess 1502 and incidence surface 1503, and light diverting device 15 extends towards a length direction 1504, and recess 1502 is positioned at the position away from incidence surface 1503, preferably, recess 1502 is positioned at the opposite side of incidence surface 1503; Have the first corrugated array 1601 on the optics adjustment surface 16, light from ultraviolet light unit 1101, red light unit 1102 and/or blue light unit 1103 is disperseed equably and/or mix to avoid backlight module 11 to produce significant luminous points or manifest not mixed uniformly coloured light.After light is injected light diverting device 15 by incidence surface 1503, part light in recess 1502 places through total internal reflection (Total Internal Relection) and the both sides of directive recess 1502, that is, the direction of directive wing teat 1501; Part light directly penetrates in recess 1502 places, and owing to the difference of light diverting device 15 and the refraction coefficient of ambient light medium (Optical Medium) produces the effect of refraction, the direction of directive wing teat 1501 makes the light quantities that directly penetrated by recess 1502 reduce but because part light suffers total reflection in recess 1502 places, so can avoid forming local luminous point near the recess 1502, preferably, the shape approximation of recess 1502 is V-type or U type.The light that is directed to the light of wing teat 1501 or other directive wing teat 1501 via recess 1502 in wing teat 1501 places through refraction, reflection or directly penetrate light diverting device 15, for example light in a special angle be incident to light diverting device 15 in will be in wing teat 1501 be mixed into uniform coloured light gradually through the several total internal reflection and penetrate light diverting device 15 outside.Light enters via incidence surface 1503 among the light diverting device 15, and incidence surface 1503 does not exceed with the plane, can also help the shape that light receives for matrix or other.

Optics adjustment surface 16 has the first corrugated array 1601, and optics adjustment the surface 16 and first corrugated array 1601 is formed on the incidence surface 1503 of light diverting device 15.The first corrugated array 1601 is adjusted formed as wavy surface on the surface 16 in optics, and this wavy surface has the direction of a wave of fixing, that is the array direction of the first corrugated array 1601 or wavefront direction, wave on the first corrugated array 1601 is several micro lens, light adjusts at surperficial 16 o'clock through optics will produce the refraction of different angles because of the micro lens on the first corrugated array 1601, the light of selfluminous cell 1101～1103 blurs and has avoided local luminous point so in the future, and the coloured light that makes light diverting device 15 be produced is more even.For making the corrugated array 1601 of winning reach preferable astigmatic effect, the diameter of micro lens is about 50～60 μ m.When the first corrugated array 1601 is continuous when wavy, the distance of continuous two crests or trough is about 100～120 μ m.

Optics adjustment surface 16 can also be arranged among the light diverting device 15, it is by refraction coefficient is different in conjunction with two material, and on the faying face of these two light transmissive materials, form the corrugated array to reach above-mentioned spectrophotometric result, shown in Fig. 2 c, its bend partly has oblique line partly to have different refraction coefficient with not indicating.The first corrugated array 1601 is not limited to be arranged on the incidence surface 1503, can also be arranged on wing teat 1501 or the recess 1502, that is on the light path of passing through the first corrugated array 1601 can be set, shown in Fig. 2 e.

Wherein the material of light diverting device 15 is combination or other light transmissive material of acryl resin (Acrylic Resin), cyclic olefin polymer (COC), polymethylmethacrylate (PMMA), polycarbonate (PC), polyetherimide (Polyetherimide), fluorocarbon polymer (Fluorocarbon Polymer), silica gel (Silicone), above-mentioned material.

Shown in Fig. 2 d, optics adjustment surface 16 can also be formed at one to have on the blooming piece 17 of opposite first 1701 and second surface 1702, optics is adjusted surface 16 and is formed on one of them surface, on

first surface

1701,1601 of the first corrugated arrays are formed on the first surface 1701, and wherein blooming piece 17 can be arranged at light diverting device 15 tops or between light diverting device 15 and luminescence unit 1101～1103.In addition, can form second optics on the second surface 1702 and adjust surface 18, and be formed with second dimple array 1801 on the second optics adjustment surface 18, yet the array direction of the first corrugated array 1601 and second dimple array 1801 is different.The first corrugated array 1601 that coincides by different direction and second dimple array 1801 can produce a line (Moir é) repeatedly, and the first corrugated array 1601 and second dimple array 1801 are adjusted suitably that the light intensity that can make the light that passes through this line that changes distributes again and the effect that reaches even disperse light.Have repeatedly the blooming piece 17 of line or dimple array as the product that Supreme Being crystalline substance company (S-Light Optoelectronics) is produced.

Optics adjustment surface

16 or 18 be not limited to be arranged at light diverting device 15 or optics face 17 one of them, can also be arranged at simultaneously on light diverting device 15 and the optics face 17, in addition, as mentioned above,

optics adjustment surface

16 or 18 can be arranged among the light diverting device 15, it is by in conjunction with the material that has different refraction coefficients more than two kinds, and forms the corrugated array to reach the effect of beam split on the faying face of these a little light transmissive materials.The frequency of the ripple size on the first corrugated array 1601 and second dimple array 1801, the shape of ripple, ripple can be identical or different.

If the array direction of the parallel first corrugated array 1601 of orientation of luminescence unit 1101,1102 and/or 1103, that is the wavefront direction of ripple, light will produce the approximate light shape that is parallel to the wavefront direction of the first corrugated array 1601 after through the first corrugated array 1601.Therefore, when the wavefront direction of the orientation of light source 1101,1102 and/or 1103 and the first corrugated array 1601 is all straight line, light will be disperseed be a straight line.When the orientation of light source 1101,1102 and/or 1103 and the wavefront direction of the first corrugated array 1601 are arcuation or radial, light will be disperseed be an arcuation or radial.In theory, when the orientation of light source 1101,1102 and/or 1103 parallel or approximately parallel with the wavefront direction of the first corrugated array 1601, can be so that light source, 1102 and/or 1103 light that produce be broken up into the light shape of extending along the wavefront direction.

The 3rd embodiment

In the present embodiment, luminescence unit 1101～1103 is a semiconductor light-emitting elements, and for example light emitting diode preferably, is light-emitting diode chip for backlight unit (die).Along with power improves, the heat that light emitting diode produced is also high more, for the heat radiation of light emitting diode is provided, the ultraviolet light unit 1101 of present embodiment, red light unit 1102 and/or blue light unit 1103 are arranged on the composite substrate 1901, shown in Fig. 3 a, wherein, 19 expression semiconductor light-emitting elements are formed, for example a LED package; 1901 expression composite substrates; 1902 expression gluing structures; 1903～indication circuit layout carrier; 1904～expression electrical contact; 1905～expression lead.

Circuit layout carrier 1903 combines by gluing structure 1902 with composite substrate 1901.Ultraviolet light unit 1101, red light unit 1102 and/or blue light unit 1103 are fixed in the dented space 1906, and connect light-emitting component 1101,1102 and/or 1103 and be formed at electrical contact 1904 on the circuit layout carrier 1903 with lead 1905 or other electric connection mode.In addition, the difference of the thermal expansivity (Thermal Expansion Coefficient) of 1901 of light-emitting component 1101～1103 and composite substrates is not more than 10 * 10 ^-6/ ℃, so can slow down 1901 of light-emitting component 1101～1103 and composite substrates because of thermal stress that thermal expansion produced.

The thermal expansivity of the chip of light emitting diode is usually between 1～10 * 10 ^-6/ ℃ between, for example: gallium nitride (GaN) is 5.4 * 10 ^-6/ ℃, indium phosphide (InP) is 4.6 * 10 ^-6/ ℃, gallium phosphide (GaP) is 5.3 * 10 ^-6/ ℃.For the thermal expansivity with light-emitting component 1101～1103 is complementary, avoid too much thermal stress to be formed at storeroom contacted with it, present embodiment uses composite substrate 1901 as the bearing substrate of forming 19, except that support circuit layout carrier 1903 and light-emitting component 1101～1103, also as a heat radiation media, and select for use suitable composite substrate 1901 to make the difference of the thermal expansivity of 1101～1103 of itself and light-emitting components be not more than 10 * 10 ^-6/ ℃, so can slow down the influence of thermal stress.

Compound substance is made up of the material more than two kinds, and this material more than two kinds can't form him and plants molecule or atomic structure.In general, compound substance can form the material that more original composition material has better physical characteristics in conjunction with the advantage of individual material, in general, and advantage such as compound substance tool light weight, high strength, thermodynamic properties are good.Compound substance can roughly be divided into metal-base composites (MetalMatrix Composite; MMC), polymer-matrix compound (Polymer Matrix Composite; PMC), reach ceramic matrix composite (Ceramic Matrix Composite; CMC), it mixes carbon fiber or ceramic fiber etc. respectively with metal, polymkeric substance and ceramic phase.At this, be the high heat that conduction light-emitting component 1101～1103 is produced, preferably can use heat-conduction coefficient to be not less than 150W/m ° of K and thermal expansivity is not more than 12 * 10 ^-6/ ℃ metal-base composites, (at present, heat-conduction coefficient is about 100～640W/m ° of K as: aluminum matrix composite; Thermal expansivity is about 5～15 * 10 ^-6/ ℃), as composite substrate 1901.But polymer-matrix compound and ceramic matrix composite can also optionally use.

Circuit layout carrier 1903 is as printed circuit board (PCB) (Printed Circuit Board; PCB), flexible printed wiring board (Flexible Printed Circuit; FPC) etc., ceramic substrate or be silicon substrate semiconductor substrates such as (Sisubstrate).Use semiconductor substrate can utilize various semiconductor technologies,, make required circuit thereon, and can integrate mutually, help the lifting of performance efficiency with the technology of light emitting diode as etching, sputter etc. as circuit layout carrier 1903.In addition, (heat-conduction coefficient is about 150W/m ° of K to have more good heat conduction property as the semiconductor substrate of silicon substrate; Thermal expansivity is about 4 * 10 ^-6/ ℃), when using jointly,, therefore can effectively reduce the generation of thermal stress, and improve heat conducting usefulness because its two heat-conduction coefficient and thermal expansivity is close with the substrate of composite substrate 1901, particularly metal-base composites.But printed circuit board (PCB) or flexible printed wiring board etc. can also optionally use.

Circuit layout carrier 1903 of the present invention is connected via a gluing structure 1902 with composite substrate 1901.Gluing structure 1902 is a sticky stuff, is preferably a soft sticky stuff layer, more preferably, is to present the soft sticky stuff layer that sticks together character under room temperature or middle low temperature.The material of this soft sticky stuff layer such as benzocyclobutene (Benzocyclobutene; BCB), the combination of epoxy resin (epoxy), polyimide (polyimide), spin-coating glass (SOG), silicones (silicone), scolder (solder) etc. or above-mentioned material.Because those soft sticky stuffs can be heating and curing under a lower temperature (being generally below 300 ℃), so can slow down composite substrate 1901 and light-emitting component 1101～1103, and/or

composite substrate

1901 and 1903 thermal stress that Yin Gaowen produced of circuit layout carrier, and can also reduce the damage that light-emitting component 1101～1103 may be subjected to because of high temperature.

The gluing structure 1902 of present embodiment more can merge and use it to plant material further to promote the gluing characteristic of gluing structure 1902 except that using above-mentioned soft adhesive material.Shown in Fig. 3 b, gluing structure 1902 comprises a soft sticky stuff layer 2001, reaches responding layer 2002 and 2003.Soft sticky stuff layer 2001 as above-mentioned material.Responding layer 2002 and 2003 is formed at respectively between soft sticky stuff layer 2001 and circuit layout carrier 1903 and/or the composite substrate 1901, to improve the gluing effect of 1901 of soft sticky stuff layer 2001 and circuit layout carrier 1903 and/or composite substrates.Responding layer 2002 and 2003 is silicon nitride (SiN _X), the combination of titanium (Ti), chromium (Cr) or above-mentioned material.Can utilize modes such as physical vapour deposition (PVD), chemical vapor deposition to form responding layer 2002 and 2003 on circuit layout carrier 1903 and the composite substrate 1901 earlier, to on a wherein side of circuit layout carrier 1903 and composite substrate 1901, form soft sticky stuff layer 2001 again, recombinant circuit layout carrier 1903 and composite substrate 1901, and impose suitable pressure and/or temperature, for example 328g/cm ²～658g/cm ²And 150 ℃～600 ℃, be preferably 505g/cm ²And 200 ℃～300 ℃, with fixed bonded circuitry layout carrier 1903 and composite substrate 1901.

Moreover, because the surface of composite substrate 1901 may be a uneven surface.Therefore, can be attached to securely on the composite substrate 1901, can form a planarization layer 21 with the uneven surface on the filled composite materials substrate 1901 in the surface of composite substrate 1901 for making gluing structure 1902.The material of planarization layer 21 is that nickel (Ni) or he plant and can form the material that combine with gluing structure 1902.

In the present embodiment, material for transformation of wave length 1402 is covered in the top of light-emitting component 1101,1102 and/or 1103, square thereon again one-tenth light transmissive material, as lens, with fixing also/or protection material for transformation of wave length 1402.

Perhaps, with material for transformation of wave length 1402 and the top that is covered in light-emitting component 1101,1102 and/or 1103 after light transmissive material or other glueing material mix mutually again.Yet material for transformation of wave length 1402 can also utilize sedimentation (sedimentaion) directly to be covered in light-emitting component 1101,1102 and/or 1103 tops not with under light transmissive material or other glueing material mix mutually.

And for improving the light extraction efficiency of light-emitting component 1101～1103, more can form a reflection horizon 22 in dented space 1906, the light of being launched in order to reflection and guiding light-emitting component 1101～1103 is mostly towards same direction.Reflection horizon 22 be can reflection ray material, as metals such as gold, silver, copper, aluminium, tin.Reflection horizon 22 can utilize various thin film deposition modes to be formed at the part or all of inside surface of dented space 1906.In addition, when reflection horizon 22 is conductive material, keep insulation for making illuminating part 1101～1103 and reflection horizon 22, preferably, reflection horizon 22 is not formed at the zone that light-emitting component 1101～1103 is covered in composite substrate 1901 tops.In addition, can reach preferable reflecting effect for making reflection horizon 22, dented space 1906 is a taper (tapered) space, that is the inwall of dented space 1906 is an inclined-plane, forms as a funnel-form space.

Though the present invention with specific embodiment explanation as above, so it is not in order to limiting content of the present invention, and any those skilled in the art appoint and execute that the craftsman thinks and be to modify neither taking off as Protector that attached claim is desired as all.

Claims

1. liquid crystal indicator comprises:

One backlight module comprises a ultraviolet light unit, red light unit and blue light unit;

One liquid crystal layer is in order to control the flux of light that this backlight module sends;

One filter layer, comprise a plurality of pixels, these a plurality of pixels are made up of at least one green pixel, at least one blue pixel and at least one red pixel, wherein this green pixel includes a material for transformation of wave length, this material for transformation of wave length is through the irradiation of this ultraviolet light unit and produce green glow, and the light that this backlight module sends respectively by this green pixel, this red pixel and this blue pixel produce to should pixel photochromic.

2. liquid crystal indicator as claimed in claim 1 is a light emitting diode one of at least in this ultraviolet light unit, this red light unit and this blue light unit wherein.

3. liquid crystal indicator as claimed in claim 1, wherein the light wavelength that produced of this ultraviolet light unit is between 200～420nm.

4. liquid crystal indicator as claimed in claim 1, wherein the light wavelength that produced of this ultraviolet light unit is between 360～400nm.

5. liquid crystal indicator as claimed in claim 1, wherein this filter layer comprises a Bragg reflecting layer with the light of selective reflecting from backlight module.

6. liquid crystal indicator as claimed in claim 1, wherein this liquid crystal layer comprises a tft layer.

7. liquid crystal indicator as claimed in claim 1 more comprises a plurality of blooming pieces.

8. liquid crystal indicator as claimed in claim 7, wherein one of them ultraviolet light of those blooming pieces.

9. liquid crystal indicator as claimed in claim 7, wherein those blooming pieces one of them select from prismatic lens, diffusion barrier, and light polarizing film one of them.

10. liquid crystal indicator as claimed in claim 1, wherein this backlight module more comprises:

One smooth diverting device is in order to guide light in this backlight module towards this liquid crystal layer.

11. liquid crystal indicator as claimed in claim 10, wherein this light diverting device has wing teat, incidence surface and recess, and this recess is away from this incidence surface.

12. liquid crystal indicator as claimed in claim 10, wherein this backlight module more comprises:

One optics is adjusted the surface, has a corrugated array, and wherein this optics adjustment surface is formed on the incidence surface of this light diverting device.

13. liquid crystal indicator as claimed in claim 1, wherein this material for transformation of wave length comprises alkaline-earth-metal silicate.

14. liquid crystal indicator as claimed in claim 1, wherein this material for transformation of wave length comprises the alkaline-earth-metal silicate of europium activation.

15. liquid crystal indicator as claimed in claim 1, wherein this material for transformation of wave length is selected from (SrBaMg) ₂SiO ₄: Eu, Ca ₈Mg (SiO ₄) ₄Cl ₂: Eu, Mn, Ba ₂SiO ₄: Eu, Ba ₂MgSi ₂O ₇: Eu, BaAl ₂O ₄: Eu, SrAl ₂O ₄: Eu and BaMg ₂Al ₁₆O ₂₇: the group that Eu constituted.

16. liquid crystal indicator as claimed in claim 1, wherein this red light unit and this blue light unit comprise fluorescent powder.

17. liquid crystal indicator as claimed in claim 1, a material that wherein constitutes this red light unit is selected from Y ₂O ₂S:Eu, Bi, Y ₂O ₃: Eu, Bi and 3.5MgO0.5MgF ₂GeO ₂: Mn ⁴⁺A group that is constituted.

18. liquid crystal indicator as claimed in claim 1, a material that wherein constitutes this blue light unit is selected from BaMg ₂Al ₁₆O ₂₇: Eu, (SrBaCa) ₅(PO ₄) ₃Cl:Eu and Sr ₄Al ₁₄O ₂₅: the group that Eu constituted.