CN1162757A - Liquid crystal display device having side edge type back light system - Google Patents
Liquid crystal display device having side edge type back light system Download PDFInfo
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- CN1162757A CN1162757A CN 96105540 CN96105540A CN1162757A CN 1162757 A CN1162757 A CN 1162757A CN 96105540 CN96105540 CN 96105540 CN 96105540 A CN96105540 A CN 96105540A CN 1162757 A CN1162757 A CN 1162757A
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Abstract
The present invention relates to a liquid crystal display(LCD)device capable of improving the display quality by preventing light leakage in the end portion of a display window on the side adjacent a fluorescent tube. Said liquid crystal display device comprises a LCD panel, a light guide placed under the LCD panel, a fluorescent tube placed close to and along at least one side of the light guide, a lamp reflector sheet for covering substantially the whole length of the fluorescent tube, a diffusion sheet placed on the light guide under the LCD panel, and a reflective sheet placed under the light guide, wherein the surface of the lamp reflector sheet, reflective sheet or the diffusion sheet on one side of the light guide is printed in color.
Description
The present invention relates to a kind of LCD (LCD), relate in particular to a kind of LCD device or unit that is called lateral edges type back light system that bottom the LCD panel, have, back light system has one along light guide plate one side and be close to the fluorescent tube of its placement, and fluorescent tube almost total length is covered by lamp reflector spare.
The above-mentioned liquid crystal display of mentioning comprises a LCD (i.e. liquid crystal panel, LCD: LCD), one places under the LCD and is the back lighting device of its illumination, one places the liquid crystal display drive circuit plate in the LCD outside surface outside, one holds the metal frame that the framework and of putting above each parts puts these elements as module, also is furnished with display window on the metal frame.LCD is by keeping the stacked two clear glass liners of certain intervals, make by the film formed display element electrode surface of electrically conducting transparent oriented film, with two substrates and be close to its peripheral frame shape substrate between two substrates and between two substrates, be close to its peripheral frame shape envelope material bonding, the part envelope material of liquid crystal to provide from liquid crystal envelope material source is provided, liquid crystal is enclosed in the envelope material between two substrates, and series of steps such as polaroid preparation outside the substrate is provided.
For example, back lighting device also comprises the light guide plate of a clear acrylic plastic sheet form, and this plate will evenly throw light on to whole LCD from the photoconduction of light source to the direction opposite with light source; One is parallel to the fluorescent tube of adjacent its placement of light guide plate one side; One covers the lamp reflector plate of fluorescent tube total length in fact, and this sheet cross section takes the shape of the letter U, and its inside surface is made white or silver color, and one places and is used for the scattering of light sheet that scattering comes from photoconductive tube on the light guide plate; One is used for the light from light guide plate is reflected reflector plate to LCD.
In addition, the light that is sent by fluorescent tube is introduced after the light guide plate by total reflection.For light being sent from the end face of light guide plate by diffuse reflection, make the pattern of drawing out by chalk that a large amount of light diffuse reflection points are arranged in the bottom of light guide plate, or very well-regulated salient point or be loaded on groove bottom the light guide plate.
This traditional liquid crystal display had description, as be in 19474/1985 the document in Japanese patent application publication No. and Japanese Utility Model not the substantive examination publication number be in 22780/1992 the document.
Figure 17 A is the top view of conventional liquid crystal display (module), and Figure 17 B is the top view of nearest liquid crystal display, its label 63 expression liquid crystal display modules; 41 expression one metal frames (as shielding deposited box); 80 represent a display window; 62 represent a LCD.
Figure 18 is and the fluorescent tube synoptic diagram of light guide plate combination that wherein label 36 is represented fluorescent tubes; 37 expression light guide plate; 65 expression light-receiving sides; 81 expression euphotic zones.
In up-to-date liquid crystal display, people's attempt provides a giant-screen (i.e. effective luminous zone of large scale), reduces the size of display unit simultaneously.Therefore, trend is the frame around display window 80 is narrowed down (distance of promptly dwindling d1 among Figure 17 B).Based on above-mentioned this tendency, being dwindled greatly apart from d2 between the pixel (promptly in fluorescent tube 36 sides) of the preferably end of the light-receiving side 65 of photoconductive tube 37 and LCD reduced to 3.3mm as tens mm of 10-15mm-from routine.In other words, the end 80 of display window be set up very near fluorescent tube 36.Therefore, the problem of appearance is that light is revealed near (bright line) may use up the expression of the leakage band end of display window 80 zone generation.
The objective of the invention is to, provide a kind of and can reveal the brilliant display unit of the stream that improves display quality at the light of fluorescent tube one side display window end by avoiding light.
For achieving the above object, one liquid crystal display comprises a LCDs, one places the optical plate under the LCDs, one along light guide plate one side at least and be close to the fluorescent tube of its storing, in fact one comprise the lamp reflector plate of fluorescent tube total length, one is seated in diffusion disk and on the photoconductive tube that is positioned under the LCDs places reflector plate under the light guide plate, and the surface of reflector plate on light pipe one side is colored.
In addition, the lower surface that is placed on the lamp reflector plate end on light guide plate one side surface is colored.
In addition, the lower surface that is placed on the lamp reflector plate end on light guide plate one side is being to have on light guide plate one side to adopt colour band by adhesion layer at least.
In addition, the lower surface of the diffusion disk of light guide plate one side is colored.
In addition, pass through adhesion layer at least in the light guide plate side, the diffusive reflective plate lower surface on light pipe one side has adopts colour band.
In addition, diffusive reflective plate is not close on the light guide plate, but has air layer between diffusive reflective plate and light guide plate.
In addition, the end of lamp reflector plate sticks on the diffusive reflective plate end that is positioned on light guide plate one side.
In addition, one kind of colors such as grey, brownish black, purple, green and black are used to dyeing.
In addition, dyeing is to carry out with the form of point.
In addition, stain is become to be parallel in fact numerous row of fluorescent tube main shaft by linear array.The central point of any point is arranged in half place of the center that is actually 2 of front and rear rows among the row, and just, point preferably is arranged in serrate.
In addition, reflector plate tightly is not bonded on the photoconductive tube, or has an air layer between light guide plate and diffusion disk.
In addition, have at least a slice lens to be placed between diffusion disk and the LCDs.
According to the present invention, reflector plate is in light-receiving limit one side, facing to light guide plate, the lower surface of lamp reflector plate places on the light guide plate plate surface, diffusive reflective plate lower surface in light-receiving limit one side is colored facing to light guide plate or with the leukorrhea stickup, makes to cause that the unnecessary light that light is revealed is colored zone or colour band absorption.This will make, and the reduction near fluorescent tube place display quality is avoided on the screen that is caused by the light leakage.
To be further understood by following specific descriptions and accompanying drawing other purpose of the present invention, advantage, mode of operation and new feature.
Figure 1A is the back lighting device side view of first embodiment of the invention about the LCD lower end.
Figure 1B is the reflector plate major part top view of Figure 1A.
Fig. 2 is the side view of second embodiment of the invention back lighting device.
Fig. 3 is the side view of third embodiment of the invention back lighting device.
Fig. 4 is the side view of four embodiment of the invention back lighting device.
Fig. 5 is the side view of fifth embodiment of the invention lighting device.
Fig. 6 be Liquid Crystal Molecules Alignment direction among the present invention, yawing moment, polarizer axes to and direction such as single matrix type liquid crystal display birefringence element optical axis between the synoptic diagram that concerns.
Fig. 7 is the three-dimensional cutaway view of major part in the liquid crystal display example.
Fig. 8 be liquid crystal deflecting element direction in another liquid crystal example, polarizer axes to and direction such as birefringence element optical axis between the synoptic diagram that concerns.
Fig. 9 is the characteristic curve that concerns between the liquid crystal display contrast of Fig. 6 and transmitted light color and the crossing angle [alpha].
Figure 10 be Liquid Crystal Molecules Alignment and yawing moment in another liquid crystal display example, polarizer axes to and direction such as birefringence element optical axis between the synoptic diagram that concerns.
Figure 11 is the instrumentation plan of angle α, β, γ.
Figure 12 is the partial cross-sectional perspective view on the electrode substrate of Color Liquid Crystal Display.
Figure 13 is the three-dimensional cutaway view of liquid crystal display module example.
Figure 14 is the block scheme of folded formula PC example.
Figure 15 is the stereographic map of folded formula PC example.
Figure 16 is the perspective view of the used work matrices type liquid crystal display module of the present invention.
Figure 17 A is the top view of conventional liquid crystal display module.
Figure 17 B is the top view of up-to-date liquid crystal display module.
Figure 18 is with photoconductive tube and lets out the combined fluorescent tube diagrammatic sketch of light belt.
Figure 1A is the side view that places the back lighting device under the LCDs in the first embodiment of the invention; Figure 1B is the top view of reflector plate major part among Figure 1A.The similar characteristics that provides the identical function componentry in the description of following relevant accompanying drawing and repetition will be omitted.
Figure 1B is the synoptic diagram that reflector plate 38 is observed along the arrow A direction among Figure 1A.
According to first embodiment, as shown in Figure 1, on light-receiving limit face 65 1 sides of light guide plate 37, has the colored spots part 1 that reflector plate surface 38 is colored, the colored spots part 1 that the unnecessary light that causes light to be revealed is had avoid light leakage effect absorbs, thereby has also avoided go down (referring to the light belt of letting out among Figure 18) of the screen display quality of close fluorescent tube 36.
In up-to-date liquid crystal display, attempt reduces the yardstick of display unit when increasing screen size, and its trend is to use the so-called framework around display window to narrow down.Based on this trend, the light-receiving limit face 65 of optical plate 37 is shortened greatly with the distance of LCDs outermost end pixel (in fluorescent tube 36 1 sides), reduces to present 3.3mm for several ten millimeters as the 10mm-from routine.Also promptly, the end of display window is configured to very near fluorescent tube 36.Therefore, light is revealed near the generation of tending to the end is worn in demonstration (referring to letting out light belt 81 among Figure 18), and the present invention attempts to address this problem with easy method.
Except that grey, brownish black, any color in purple or the green may be used to the dyeing of position 1 round dot.Proportional with the situation of sewing light and intensity, control makes them reach optimum value by structure, size, direction, the color harmony color density of the round dot pattern in the position 1 of colour point printing.According to embodiment 1, the width W at the position of being printed by colour point 1 is 0.1-2mm.As the round dot pattern, so the orientation form makes round dot be linear contour being arranged in rows (being called dotted line arranges) at the major axes orientation of fluorescent tube 36 with the annular point that is easy to print.In addition, be oriented in fluorescent tube 36 major axes orientations the row of round dot between adjacent row the mutual translation of form and be positioned to serrate (being called indentation or rounded projections arranged: for example line up equilateral triangle or isosceles triangle).In addition, the area of each round dot reduces along with the increase of point and 36 distances of fluorescent tube proportionally, so that cannot see round dot on screen.
Go up on the surface of the reflector plate 38 of light-receiving limit face 65 1 sides or when a stain is printed thereon, duskiness lines will appear on the screen if a colour band (seeing the following embodiment that will describe 3) is attached to.This is a kind of phenomenon of occurring of not wishing, because this needs two diffusive reflective plate reach this line that disappears.
Fig. 2 is the side view of back lighting device in the second embodiment of the invention.
According to second embodiment of the present invention, the part 1 of the Vertex Coloring of printing with grey color dot is arranged on the lower surface of lamp reflector sheet 66 ends 70, and lamp reflector sheet 66 is to be placed on light-receiving limit face 65 1 sides on light guide plate 37 surfaces.Though the position at the position of printing with colored point 1 is different from the situation among the embodiment 1, screen is gone up letting out light and still can avoid near fluorescent tube 36 places as the first embodiment situation.The remainder of this structure is similar to first embodiment among Fig. 1.
Fig. 3 is the side view of back lighting device in the third embodiment of the invention.
According to the 3rd embodiment, fascia cinerea 2 pastes on the lower surface of lamp reflector sheet 66 ends 70 by adhesion layer 75, and lamp reflector sheet 66 is arranged on the surface of light-receiving limit face 65 1 sides of light guide plate 37.The first, the second embodiment avoids letting out light to print color dot, and stickup colour band 2 replacements of embodiment three.Therefore, let out that optical phenomenon is the same with situation among first and second embodiment can be avoided on the screen.At this, at least one side, promptly the lower surface of light guide plate 37 need be colored; Thereby the lower surface that is colored will be utilized with subsides band surperficial or that have dyeing to distinguish.
Though the light guide plate 37 among the first, two embodiment is to adopt dull and stereotyped (rectangular parallelepiped) shape.But light guide plate 37 is wedge shape (cross section is trapezoidal) in the 3rd embodiment, and the structure of others is the same with situation among first and second embodiment.Say that by the way colour band 2 is to paste on the surface of light guide plate 37 by adhesion layer 71.
Fig. 4 is the side view of back lighting device in the four embodiment of the invention.
According to the 4th embodiment, the position 1 that is printed with the grey round dot is arranged on the lower surface that diffusive reflective plate 39 is positioned at light-receiving limit face 65 1 sides.Though second embodiment of Fig. 2 is printed on color dot in order to avoid let out the lower surface that the position 1 of light is arranged on light guide plate 37 above lamp reflector spares 66, position 1 is arranged on the lower surface of diffusive reflective plate 39 in the 4th embodiment.Therefore, can go to avoid sewing by any form among several embodiment before the present invention.By the way, the end 70 of lamp reflector sheet 66 is to paste the lip-deep of diffusive reflective plate 39 by adhesive linkage 71.All the other aspects of this structure are similar to second embodiment of Fig. 2.
Fig. 5 is the side view of the back lighting device of fifth embodiment of the invention.
According to the 5th embodiment, grey colour band 2 is to paste on the lower surface of diffusive reflective plate 39 by adhesive linkage 75, and diffusive reflective plate 39 is on face 65 1 sides of the light-receiving limit of wedge shape light guide plate 37.Therefore, can be avoided with the same light leak of the aforesaid any form of the present invention.By the way, the end 70 of lamp reflector sheet 66 is to bond on the surface of diffusive reflective plate 39 by the two-sided colour band 79 that contains adhesion layer 78 basic units 76, adhesion layer 77.All the other aspects of this structure are similar to the 3rd embodiment of Fig. 3.
According to first to the 5th embodiment of the present invention, the effect of avoiding light to leak is thick-and-thin in both cases, that is, no matter stain district or colour band are set at the upside or the downside of light guide plate 37, work all to prevent that light from leaking.
To be example below, the accompanying drawing 1-5 of the present invention first to five embodiment will be described with the matrix type liquid crystal display.
Fig. 6 represents be the arrangement (being glide direction) of liquid crystal molecule and yawing moment, polaroid polarization (absorption) direction of principal axis, draw the optical axis of the element that on electrode substrate, causes birefringence effect, this is that the top of LCDs 62 of the liquid crystal display that obtains from the present invention is observed.Fig. 7 is the three-dimensional cutaway view of LCDs 62 major parts.
The yawing moment 10 of liquid crystal molecule and deflection angle are by the glide direction 6 of the orientation on the top electrode substrate 11 21, the factor regulations such as glide direction 7, the kind that is added to the stimulative substance that has positive anisotropic dielectric in the line liquid crystal layer 50 that is immobilizated between the upper/lower electrode lining 11,12 and quantity of alignment films 22 on the bottom electrode substrate 12.
In order to serve as a contrast the liquid crystal molecule orientation of the helical structure between 11,12 at two electrodes up and down that held liquid crystal layer 50, adopted so-called sliding technology, promptly, adopt single direction sliding technology such as cloth, the poly-of organic vibrin such as polyimide contacts with the upper and lower clear glass electrode substrate 11,12 of liquid crystal to the surface of film 21,22, then serves as a contrast the direction that frictional direction 6 in 11 and the frictional direction in bottom electrode substrate 12 7 just are defined in Liquid Crystal Molecules Alignment at top electrode.Thereby upper and lower two electrode substrate 11,12 are directed the d1 distance of being separated by and face one another, and in fact two frictional directions 6,7 have 180 °～360 ° angles.The one shaped as frame sealing 52 that is used to inject liquid crystal that has opening 51 (sealing liquid crystal) is used to bonding two electrode substrate 11,12.When positive anisotropy dielectric was enclosed in the breach with the nematic liquid crystal that contains the scheduled volume stimulative substance, the arrangement like this of liquid crystal molecule caused the helical structure that deflection angle is arranged between two electrode substrate.Label 31,32 is represented transparent upper/lower electrode respectively, as indium oxide or tin indium oxide.The element 40 (after this being called photorefractive element) that birefringence effect takes place is placed on the top electrode lining 11 of liquid crystal cells 60.In addition, upper and lower polaroid 15,16 and element 40 also have liquid crystal cells 60 to constitute an integral body.
The desirable deflection angle scope of liquid crystal molecule is between 180 °-360 ° in the liquid crystal layer 50, better between 200 °-300 °, preferably between 230 °-270 °, this is the angle from reality, this makes the printing opacity-light transmission state of effect voltage curve near threshold values the time begin just to obtain to suppress from light scattering phenomenon, divides equally characteristic to keep the good time.This condition makes liquid crystal molecule to voltage responsive reaction be arranged, and makes the good time divide equally characteristic and comes true.Be the display quality that obtains, the product n1d1 scope of the anisotropic refraction rate n1 of liquid crystal layer and its thickness d 1 can be preferably in the 0.6 μ m-0.9 μ m in 0.5 μ m-10 μ m.
Birefringence element 40 is used to modulate by the polarization situation of the light of liquid crystal cells 60 and will be shown by the colour that liquid crystal cells 60 produces as instance entity and change white and black displays into.Reason for this reason, the product Δ n2d2 of liquid crystal layer anisotropic refraction rate Δ n2 and thickness d 2 is considerable, preferably at 0.4 μ m-0.8 μ m, 0.5 μ m-0.7 μ m preferably.
When LCDs 62 is utilized the birefringent elliptic polarization light time, the axle of polaroid 15,16, and with single shaft transparent optical refracting plates during as photorefractive element 40, the relation between the liquid crystal orientation of the electrode substrate 11,12 of optical axis and liquid crystal cells 60 just seems extremely important.
Referring to Fig. 6, will effect and the effect with co-relation be described.Fig. 6 represents is relation between all directions such as direction of liquid crystal molecule in the optical axis of polaroid optical axis, the transparent birefringence element of single shaft and the liquid crystal cells electrode substrate of watching with the top of LCDs structure among Fig. 7.
In Fig. 7, the optical axis of the transparent birefringence element 40 of label 5 expression single shafts; The orientation of the liquid crystal molecule of the top electrode substrate 11 that 6 expressions and birefringence element 40 adjoin; The orientation of the liquid crystal molecule of 7 expression bottom electrode substrates 12; The absorption or the polarization axle of 8 expression upper polarizers 15; 9 expressions are the absorption or the polarization axle of polaroid 16 down.In addition, α represents the angle between the optical axis 5 of the liquid crystal molecule direction 6 of top electrode substrate 11 and uniaxial birefringence element 40; β represents the angle between the optical axis of the absorption of upper polarizer 15 or polarization axle 8 and the transparent birefringence element 40 of single shaft; Angle under γ represents between the Liquid Crystal Molecules Alignment direction of the absorption of polaroid 16 or polarization axle 9 and bottom electrode substrate 12.
To do definition to the measuring method at α, β, γ angle in this instructions.In Figure 11 A and 11B, the measuring method at angle will be by being that example describes with the angle between the Liquid Crystal Molecules Alignment direction of the optical axis 5 of birefringence element 40 and top electrode substrate.Angle between optical axis 5 and the Liquid Crystal Molecules Alignment direction 6 can be represented with Φ 1 and Φ 2, as Figure 11 A and 11B, to adopt less among Φ 1, the Φ 2 angle in this instructions because in Figure 11 A Φ 1＜Φ 2, so the angle between the orientation 6 of optical axis 5 and liquid crystal molecule is defined as α.Φ 1＞Φ 2 in Figure 11 B, this angle Φ 2 of optical axis 5 and Liquid Crystal Molecules Alignment direction 6 is defined as α.When Φ 1=Φ 2, as seen, any all can adopt.
Angle [alpha], β, γ are very important in this liquid crystal display.
Angle 0 can be selected between 50 °-90 °, is preferably between 70 °-90 °, and angle β can be selected between 20 °-70 °, is preferably in 30 °-60 °, and angle γ can be selected between 0 °-70 °, is preferably between 0 °-50 °.
As long as the deflection angle of the liquid crystal layer 50 of liquid crystal cells 60 is within 180 ° of-360 ° of scopes, angle α, β, γ all can be in above-mentioned scopes, no matter polarization occurs in clockwise still counterclockwise.
Though birefringence part 40 is set between upper polarizer 15 and the top electrode substrate 11, as shown in Figure 7, it also can be placed between bottom electrode substrate 12 and the following polaroid 16.In this case, all arrange all be provided with superincumbent identical.
What Fig. 8 represented is a special case of deflection angle theta.As shown in Figure 8, the deflection angle of liquid crystal molecule is 240 °, and the same with single axial birefringence element 40, is utilized by liquid crystal cells (similar in appearance to the orientation) formation of parallel orientation, and promptly deflection angle theta is zero.Thickness of liquid crystal layer d (μ m) and the ratio d/p that comprises the liquid crystal material pitch P (μ m) of stimulative substance are made as 0.67.
Before the experience friction process, form polyimide resin oriented film 22,21.Top rake is used for making oriented film to be subjected to friction process, and this process makes the liquid crystal molecules tilt orientation that contacts with oriented film with respect to substrate surface.The Δ n2d2 value of above-mentioned single shaft printing opacity refracting element 40 is about 0.6 μ m.On the other hand, the Δ n1d1 value of the liquid crystal layer that contains liquid crystal molecule 50 of deflection structure 240 is approximately 0.8 μ n.
At this moment, angle α, β, γ are set to about 90 °, 30 °, 30 ° respectively.When being added to voltage on the liquid crystal layer 50 by upper and lower electrode 31,32 less than threshold values, there is not light transmission, promptly be dark shape, when voltage surpasses a certain threshold values, light transmission is arranged, be white in color; In other words, white and black displays becomes possibility.At this moment, the polarization axle of following polaroid 16 changes 50 °-90 ° from above-mentioned position, and is white in color when voltage is added on the liquid crystal layer 50, is black when voltage surpasses threshold values, and therefore, white and black displays becomes possibility.
Fig. 9 represents, when the angle α curve that the contrast variation relation under the operation is described with 1/200 ratio with all the time during placement variation with Fig. 8.Though when angle α remains near 90 °, show very high contrast, when angle when this angle changes, the contrast reduction.In addition, when the α angle diminished, it is blue that half-light and light district become, when the α angle increases, and half-light district purpling, the flavescence of light district, white and black displays becomes impossible.Similar situation all can obtain under the situation of α and β, γ.As mentioned above, when the γ angle when 50 ° forward 90 ° to, counter-rotating appears in white and black displays.
What Fig. 8 represented is another special case of deflection angle theta.Its basic layout is same as shown in Figure 8.Cause under different the having of this example and list: the deflection angle of liquid crystal layer 50 liquid crystal molecules is 260 °, Δ n1d1 scope is about 0.65 μ m-0.75 μ m, the Δ n2d2 that is used as the parallel-oriented liquid crystal layer of single shaft printing opacity birefringence element 40 is about 0.58 μ m, and is identical with above-mentioned special case.Thickness of liquid crystal layer is d/p=0.72 with the ratio that contains the pitch p (μ m) of the nematic liquid crystal material of stimulative substance.
At this moment, angle α, β, γ value are made as about 100 ° respectively, and 35 °, 15 °.Thereby, similar in white and black displays situation and first example.In addition, same first example with descending the polarization axle of polaroid to change 50 ° to 90 ° from above-mentioned position, can obtain the white and black displays counter-rotating.The rotation trend at α, β, γ angle is similar to the first routine situation in fact.
In above-mentioned arbitrary example, the parallel-oriented liquid crystal cells that is not subjected to liquid crystal deflecting element has been used as single shaft printing opacity birefringence element 40.Yet, when using the liquid crystal layer of 20 ° to 60 ° of liquid crystal deflecting elements, the change color that comes from angle reduces, as above-mentioned liquid crystal layer 50, the liquid crystal layer of deflection is made of the liquid crystal that remains between two liners, so that the direction setting that experiences a pair of transparent substrates of orientation process is cross one another deflection angle, in such cases, in holding two orientation directions of liquid crystal deflecting element structure, one direction in two accurate half-angles of interior angle can be by the optical axis as photorefractive element.And, can use a transparent polyester film (the preferably film of uniaxial tension) as photorefractive element 40, in this case, PET (polyethylene terephthalate), acrylic plastics film and polycarbonate can be used as thin polymer film.
Though in the example in front, photorefractive element is a simple member, can between bottom electrode substrate 12 and following polaroid 16, inserts other using up and penetrate sheet.At this moment, the Δ n2d2 value of anaclasis sheet can be readjusted.
In addition, as shown in Figure 12, utilizing provides red, green, blue colored filter 33R, 33G, 33B to realize colored the demonstration on the film 330 that is in the light between top electrode lining 11 and each optical filter.Figure 10 represents the arrangement and the yawing moment of liquid crystal molecule in the precedent, the polaroid polarization axle to and direction such as photorefractive element optical axis between relation.
In Figure 12, for reducing hackly influence, on optical filter 33R, 33G, 33B and the film 33D that is in the light, form a smooth dielectric film, oriented film 21 and top electrode 31 also form thereon.
Figure 13 one comprises light source and drives the three-dimensional cutaway view of the integrated pocket LCDs module 63 of the driving circuit of LCDs 62.The integrated circuit 34 that is used to drive LCD 62 is arranged on shaped as frame printed panel 35.Having analysed a window puts wherein to be fit to LCDs 62.The printed panel 35 that has LCDs 62 is placed in the window of framework 42, and framework 42 is formed by mould of plastics, and metal frame 41 is put on it, and the gap 44 places bending of button pawl 43 on framework 42 is to be fixed to frame 41 on the framework 42.
Cold cathode fluorescent tube 36 is placed in the upper and lower end of LCDs 62 respectively, and the light guide plate 37 of being made by acrylic sheet makes light from cold cathode fluorescent tube 36 to liquid crystal 60 even irradiation.Reflector plate 38 is made by the sheet metal that white paint applies.Light from light guide plate 37 being carried out the scatter plate 39 of scattering puts into the window from the behind of framework 42 by the order of Figure 13.The reverse power supply circuit (mark) of cold cathode fluorescent tube 36 illumination is positioned in the groove (not shown, facing to the groove 45 of reflector plate 38) on the back side, framework 42 right side.Scatter plate 39, light guide plate 37, cold cathode fluorescent tube 36 and reflector plate 38 are bent in the hole of into stretching on the framework 42 47 and are fixed by being arranged on tongue piece 46 on the reflector plate 38.
Also can utilize the present invention first to the 5th embodiment shown in Fig. 1-5 to avoid near the leakage of the light on the screen at light source place.Though the explanation illustration in Figure 13 to him is omitted.Each two opposite side of liquid crystal display mask 63 in Figure 13 of two cold cathode fluorescent tubes 36 are laid.In addition, also the light in two cold cathode fluorescent tubes 36 is leaked and calculate.
Figure 14 is collapsible PC block scheme, and wherein liquid crystal display mask module 63 is as its display unit.Figure 15 is the collapsible PC synoptic diagram of liquid crystal display mask module 63 of packing into.In collapsible PC 64, utilize the controller LST 148 of liquid crystal drive SIC (semiconductor integrated circuit) 34 to drive liquid crystal display mask module 63 by one by microprocessor 49 result calculated.
As mentioned above, having superior time equal drive characteristic also can white and black displays can obtain as putting to the proof in the above special case with the colored field effect LCD that shows.
Below will provide active-matrix type LCD of the present invention and can be applicable to first shown in Fig. 1 to 5 to the 5th embodiment.
Figure 16 is the three-dimensional cutaway view of LCD module MDL ingredient.
In Figure 16, the shielded rack that on behalf of a sheet metal, SHD make; WD represents a display window; INS1-3 represents insulcrete; (PCB1 represents the circuit board of drain side to PCB1-3 indication circuit plate, and PCB2 represents the circuit board of control panel side; PCB3 represents the interface circuit plate); JN represents to electrically connect the web member of each circuit board PCB1-3; TCP1, TCP2 represent that band carries plug-in unit; PNL represents LCD panel; GC represents the rubber cushion pad; ILS represents the shading pad; PRS represents prismatic lens; SPS represents diffusion sheet; GLB represents light guide plate; RFS represents reflector plate; MCA represents the underframe made by the monoblock module; LP represents fluorescent tube; LPC indication lamp cable; GB represents to support the rubber bush of fluorescent tube LP.More than these elements as shown in Figure 16, stack with vertical position relation and to put among the liquid crystal display framework MDL.
LCD module MDL provides two kinds of elements to support low frame MCA and shielded rack to hold.Module MDL assembles by holding to couple together with the low framework MCA that holds the back illumination device BL that comprises fluorescent tube LP, light guide plate GLB, prismatic lens PRS and analog with the metallic shield frame SHD of shielding insulation sheet INS1-3, circuit board PCB1-3 and LCD panel PNL.
Leak the present invention first that also can utilize shown in Fig. 1-5 near the light at light source place on the screen and be avoided to the method for the 5th embodiment, though its explanation is omitted in Figure 16.
The present invention is described in detail with reference to embodiment, but this bright embodiment that is not limited only to, and can under the prerequisite that does not deviate from the scope of the invention and spirit, carry out the modification of multiple mode.For example according to first to the 5th embodiment shown in Fig. 1-5, the end of lamp reflector sheet 66 is adhered on the light pipe 37 or is attached to the surface of scatter plate 39 by adhesion layer 71 or double sticky tape 79, and the other end of lamp reflector sheet 66 then is to be pressed on the framework or the form similarly not paste.Yet, and nonessential with this kind mode.In other words, for example the end 70 of lamp reflector sheet 66 can be put on framework or the framework module by pressure, and the other end of lamp reflector 66 can paste on the lower surface or reflector plate 38 of light pipe 37 by adhesion layer.But 39 1 scatter plates of diffusion sheet also can be and reflector plate the combination of framework or analog.Though being printed with the layout at the position 1 of colored round dot is according to Figure 1A, 1B, 2 or 4 embodiment 1,2 or 4 does, and round dot structure or layout are not as among Figure 1A.Can control the structure, size, direction, tone, the color density that are printed with the round dot pattern on the colored some position with optimization according to the situation and the intensity of leak light.In addition, the intent of the present invention is not by the round dot pattern but reach by colour printing.In addition, grey, brownish black, purple, green, black and other look all are available for the colour band of dyeing part.
As above said, display quality can improve by preventing from effectively to shield near the light leakage at light source place and the liquid crystal display of compactness of the present invention and light weight.
Claims (21)
1. LCD with peripheral type back light system comprises:
One LCD panel;
One is positioned at the light guide plate under the above-mentioned LCD panel;
One scatter plate between above-mentioned light guide plate and above-mentioned LCD panel;
One along light guide plate one side at least and be close to the fluorescent tube of its storing;
One covers the lamp reflector sheet of fluorescent tube total length in fact, and its end is stacking the end of light guide plate;
One is positioned at the reflector plate under the light guide plate;
It is characterized in that, be the close light guide plate fluorescent tube place between light guide plate and scatter plate or reflecting plate of the color layer of light leakage prevention.
2. LCD according to claim 1 is characterized in that, above-mentioned color layer is printed in reflecting plate one side and formed, and this side of reflecting plate is facing to light guide plate.
3. LCD according to claim 1 is characterized in that, above-mentioned color layer is the color layer of printing in lamp reflector one side, and this side of above-mentioned reverberator is facing to light guide plate.
4. LCD according to claim 1 is characterized in that, above-mentioned color layer is the colour band that has on above-mentioned lamp reflector one side of adhesion layer, and this side of above-mentioned lamp reflector is to light guide plate.
5. LCD according to claim 1 is characterized in that, above-mentioned color layer is one to be printed on the color-printed layer on above-mentioned scatter plate one side, and this side of scatter plate is to light guide plate.
6. LCD according to claim 1 is characterized in that, above-mentioned color layer is the colour band that has on above-mentioned scatter plate one side of adhesion layer, and a side of above-mentioned scatter plate is to light guide plate.
7. according to claim 1,2,3,4,5 or 6 described LCD, it is characterized in that above-mentioned astigmatism plate is not to be bonded on the light guide plate, or between astigmatism plate and light guide plate, have an air layer.
8. according to claim 1,2,3,4,5 or 6 described LCD, it is characterized in that said reflection plate is not bonded on the light guide plate, but between light guide plate and astigmatism plate, have an air layer.
9. according to claim 1,2,3,4,5 and 6 described LCD, it is characterized in that having at least a lens to be placed on the rolling of above-mentioned scatter plate and liquid crystal and show between the panel.
10. according to claim 1,2,3,4,5,6,7,8 and 9 described LCD, it is characterized in that the color of above-mentioned color layer is a kind of in the color such as grey, dark brown, purple, green and black.
11., it is characterized in that above-mentioned color layer is that the form with round dot coats according to claim 2,3 or 5 described LCD.
12. LCD according to claim 11, it is characterized in that, each above-mentioned round dot is lined up the row who is parallel to the fluorescent tube major axes orientation, and in fact the point in wherein any two points of lining up in first row who is parallel to the fluorescent tube main shaft is arranged in the position at half place between second front or rear any two mid points of arranging of above-mentioned first row.
13. have the LCD of peripheral type back light system, it comprises:
One LCD panel;
One places the light guide plate under the LCD panel;
One places the scatter plate between above-mentioned light guide plate and the LCD panel;
One along light guide plate one side at least and be close to the fluorescent tube of its storing;
One covers the lamp reflector sheet of fluorescent tube total length, and this lamp reflector sheet overlays an end of above-mentioned light guide plate.
One places the reflecting plate of above-mentioned light guide plate, and reflecting plate is printed with color on the face of light guide plate one side.
14. one has the LCD of peripheral type back lighting device, it comprises:
One LCD panel;
One is positioned at the light guide plate of LCD panel below;
One scatter plate between above-mentioned light guide plate and LCD panel;
One at least along above-mentioned light guide plate one side, and is close to the fluorescent tube of its storing;
One covers the lamp reflector sheet of fluorescent tube total length, and an end of this sheet is stacked in the end of above-mentioned light guide plate;
One is positioned at the reflecting plate below the light guide plate,
It is characterized in that, be seated in light guide plate lip-deep lamp reflector sheet one end on one side below be printed with color.
15. have the LCD of peripheral type back light system, it comprises:
One LCD panel;
One is positioned at the light guide plate under the LCD panel;
One scatter plate between light guide plate and LCD panel;
One at least along light guide plate one side and the adjacent fluorescent tube that it is put;
One covers the lamp reflector sheet of fluorescent tube total length, and its end is stacked in an end of light guide plate;
One is positioned at the reflector plate under the light guide plate.
It is characterized in that the lower surface that is placed in the lamp reflector sheet end of light guide plate one side surface passes through adhesion layer, sticks colour band in a side that is light guide plate at least.
16. have the LCD of peripheral type back light system, it comprises:
One LCD panel;
One is positioned at the light guide plate below the LCD panel;
One scatter plate between light guide plate and LCD panel;
One at least along the fluorescent tube of light guide plate one side and adjacent its placement;
One covers the lamp reflector sheet of fluorescent tube total length, and its end is stacked in a side of light guide plate;
One is positioned at the reflector plate under the light guide plate;
It is characterized in that the lower surface that is positioned at the diffusion sheet of above-mentioned light guide plate one side is colored.
17. have the LCD of peripheral type back light system, it comprises:
One LCD panel;
One is positioned at the light guide plate under the LCD panel;
One scatter plate between light guide plate and LCD panel;
One at least along the fluorescent tube of light guide plate one side and adjacent its setting;
One covers the lamp reflector sheet of fluorescent tube total length, and its end is stacked in an end of light guide plate;
One is positioned at the reflector plate below the light guide plate;
It is characterized in that, have colour band by adhesion layer at the diffusion sheet lower surface of light guide plate one side.
18. have the LCD of peripheral type back lighting device, it comprises:
One LCD panel;
One is positioned at the light guide plate below the LCD panel;
One scatter plate between light guide plate and LCD panel;
One at least along a side of light guide plate, and the fluorescent tube of adjacent its setting;
One covers the lamp reflector sheet of fluorescent tube total length, and its end is stacked in a side of light guide plate;
One is positioned at the reflecting plate below the light guide plate,
It is characterized in that, the nonferrous layer of light leakage prevention is arranged near the light guide plate fluorescent tube place between light guide plate and scatter plate or reflecting plate, and above-mentioned a plurality of round dot linearity is lined up the row who is parallel to the fluorescent tube major axes orientation, and in fact point is arranged in the position at half place between second front or rear any two mid points of arranging of above-mentioned first row among any two points of lining up in first row who is parallel to the fluorescent tube main shaft.
19. LCD according to claim 18 is characterized in that, above-mentioned color layer is the dye layer on one side of above-mentioned reflection horizon, and a side of above-mentioned reflector plate is facing to above-mentioned light guide plate.
20. LCD according to claim 18 is characterized in that, above-mentioned nonferrous layer is that a side of the above-mentioned reverberator of dye layer on lamp reflector one side faces toward light guide plate.
21. LCD according to claim 18 is characterized in that, above-mentioned nonferrous layer is that above-mentioned scatter plate one side of the dye layer on scatter plate one side is facing to light guide plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96105540 CN1162757A (en) | 1995-03-06 | 1996-03-06 | Liquid crystal display device having side edge type back light system |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP45348/95 | 1995-03-06 | ||
| CN 96105540 CN1162757A (en) | 1995-03-06 | 1996-03-06 | Liquid crystal display device having side edge type back light system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1162757A true CN1162757A (en) | 1997-10-22 |
Family
ID=5118903
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96105540 Pending CN1162757A (en) | 1995-03-06 | 1996-03-06 | Liquid crystal display device having side edge type back light system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1162757A (en) |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6906767B1 (en) | 1999-09-14 | 2005-06-14 | Seiko Epson Corporation | LCD with diffuser having particular haze value and diffuser-reflector distance, and reduced parallax |
| CN1318865C (en) * | 2002-12-20 | 2007-05-30 | 鸿富锦精密工业（深圳）有限公司<Del/> | Light board and light source system |
| CN100349051C (en) * | 2001-11-13 | 2007-11-14 | 三星电子株式会社 | Liquid crystal display apparatus |
| CN100362370C (en) * | 2000-03-01 | 2008-01-16 | 日本板硝子株式会社 | Optical guider and linear luminating device |
| CN100390627C (en) * | 2001-03-29 | 2008-05-28 | 恩普乐股份有限公司 | Light conducting plate, surface light source device and liquid crystal display device |
| CN100432709C (en) * | 2004-09-27 | 2008-11-12 | 中华映管股份有限公司 | Notebook computer, backlight module and light guiding board |
| CN100439942C (en) * | 2002-12-12 | 2008-12-03 | 三星电子株式会社 | Optical conducting plate with stepped edge and display device with the same optical conductive plate |
| CN103547852A (en) * | 2011-05-24 | 2014-01-29 | 住友化学株式会社 | Light guide plate, surface light source device, and transmission type image display device |
| US9207386B2 (en) | 2008-12-30 | 2015-12-08 | Lg Display Co., Ltd. | Backlight unit and liquid crystal display module including the same |
| CN101583823B (en) * | 2007-01-19 | 2016-05-11 | 皇家飞利浦电子股份有限公司 | Lighting apparatus |
| CN106886099A (en) * | 2015-10-30 | 2017-06-23 | 乐金显示有限公司 | Display device |
| US9857521B2 (en) | 2015-04-20 | 2018-01-02 | Apple Inc. | Liquid crystal display with backlight color compensation structures |
| CN109782480A (en) * | 2017-11-15 | 2019-05-21 | 夏普株式会社 | Display device |
| CN112666648A (en) * | 2020-12-21 | 2021-04-16 | 滁州佳宏光电有限公司 | Light guide plate display device capable of reducing light leakage of light source |
-
1996
- 1996-03-06 CN CN 96105540 patent/CN1162757A/en active Pending
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6906767B1 (en) | 1999-09-14 | 2005-06-14 | Seiko Epson Corporation | LCD with diffuser having particular haze value and diffuser-reflector distance, and reduced parallax |
| CN100362370C (en) * | 2000-03-01 | 2008-01-16 | 日本板硝子株式会社 | Optical guider and linear luminating device |
| CN100390627C (en) * | 2001-03-29 | 2008-05-28 | 恩普乐股份有限公司 | Light conducting plate, surface light source device and liquid crystal display device |
| CN100349051C (en) * | 2001-11-13 | 2007-11-14 | 三星电子株式会社 | Liquid crystal display apparatus |
| CN100439942C (en) * | 2002-12-12 | 2008-12-03 | 三星电子株式会社 | Optical conducting plate with stepped edge and display device with the same optical conductive plate |
| CN1318865C (en) * | 2002-12-20 | 2007-05-30 | 鸿富锦精密工业（深圳）有限公司<Del/> | Light board and light source system |
| CN100432709C (en) * | 2004-09-27 | 2008-11-12 | 中华映管股份有限公司 | Notebook computer, backlight module and light guiding board |
| CN101583823B (en) * | 2007-01-19 | 2016-05-11 | 皇家飞利浦电子股份有限公司 | Lighting apparatus |
| US9207386B2 (en) | 2008-12-30 | 2015-12-08 | Lg Display Co., Ltd. | Backlight unit and liquid crystal display module including the same |
| CN103547852A (en) * | 2011-05-24 | 2014-01-29 | 住友化学株式会社 | Light guide plate, surface light source device, and transmission type image display device |
| US9857521B2 (en) | 2015-04-20 | 2018-01-02 | Apple Inc. | Liquid crystal display with backlight color compensation structures |
| CN106886099A (en) * | 2015-10-30 | 2017-06-23 | 乐金显示有限公司 | Display device |
| CN106886099B (en) * | 2015-10-30 | 2020-08-11 | 乐金显示有限公司 | Display device |
| CN109782480A (en) * | 2017-11-15 | 2019-05-21 | 夏普株式会社 | Display device |
| CN112666648A (en) * | 2020-12-21 | 2021-04-16 | 滁州佳宏光电有限公司 | Light guide plate display device capable of reducing light leakage of light source |
| CN112666648B (en) * | 2020-12-21 | 2022-05-10 | 滁州佳宏光电有限公司 | Light guide plate display device capable of reducing light leakage of light source |
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