CN1542466A - Light conducting plate structure - Google Patents
Light conducting plate structure Download PDFInfo
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- CN1542466A CN1542466A CNA031240941A CN03124094A CN1542466A CN 1542466 A CN1542466 A CN 1542466A CN A031240941 A CNA031240941 A CN A031240941A CN 03124094 A CN03124094 A CN 03124094A CN 1542466 A CN1542466 A CN 1542466A
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Abstract
The side-lighting light guiding board structure with micro lugs is used in the back light module of LCD or similar object. The micro lugs in the light guiding board has parabolic density distribution, that is, the micro lugs density distribution is dense near light source, gradually rarer and densest in the ultimate far position. The micro lugs are in micron level size and interval. The parabolic design can result in efficient homogeneous area light source.
Description
Technical field
The present invention relates to a kind of side irradiation type light conducting plate structure, especially refer to a kind of light guide plate that particular design has micron-sized size and spacing micro-protuberance thing pattern that is distributed with thereon, this micro-protuberance thing pattern density distributes and is the parabolic type relation, to obtain even area source efficiently.
Background technology
Because LCD LCD is non-luminiferous device, need just can reach the function of demonstration by means of backlight module.The backlight module general reference can provide the assembly of area source, can be considered light source, light guide plate and blooming three parts basically.Wherein, the function of light guide plate (Light Guide Panel or LGP) is to guide the scattering direction of light, is used for improving the briliancy of panel, and guarantees the homogeneity of panel luminance.Backlight module has been widely used in backlight liquid crystal display illumination purposes such as (back-light).
Backlight light source technology commonly used mainly contains side-light type and straight-down negative.Under the trend of slimming, lightweight and low consumption electrification, highlight the characteristics of side-light type in recent years, the medium and small-sized panel adopts the design of side-light type light guide plate more.
The optical design of side-light type light guide plate is that the light source with side incident changes into uniform surface light source by the front stray mist efficiently, can not cause the loss of light intensity when just guiding light, and utilize the diffusion component of light guide plate bottom that light is derived.
Further specify, with light guide plate material PMMA material commonly used is example, its refractive index n is 1.55, the light that fluorescent tube sends enters the end face (being end face irradiation, edge light) of backlight through air, the light that enters light guide plate utilizes total reflection principle toward other end conduction, just light is in light guide plate in the natural transmission course, the light that penetrates can the dissipation loss and all the reflected back light guide plate (light with 90 ° of incidents is example, from the air transfer to the refractive index n 1.55 medium, its critical angle α
cBe approximately 40 °, α is approximately 50 °, so incident angle is all greater than reflection angle, light will transmit in light guide plate with total reflection phenomenon), if and the light in the total reflection process is run into the scattering point of bottom surface of light guide plate, its reflected light can be toward all angles diffusion, destroys total reflection condition and light is penetrated from light guide plate is positive.
Therefore, transferring to light in the light guide plate can change light source and assemble situation because of the difference of the scattering point of light guide plate design.The scattering point design of side-light type light guide plate is opened clear 63-24529 communique in fact by Japan previously and is disclosed, and is at the light guide plate back side, prints milky scattering point, and the light in transferring to light guide plate runs into scattering point, just penetrates the light guide plate exiting surface.
Yet scattering point can not satisfy the light extraction efficiency and the uniformity coefficient requirement of area source; Therefore, people's scattering pattern (pattern) of beginning one's study and meeting the optics requirement.This moment is in order to consider the area source uniformity coefficient of outgoing, so according to amount of light along with the phenomenon of successively decreasing away from light source, the adjustment of scattering pattern printing density has been arranged, promptly count from light source, the spacing of scattering pattern or area are by dredging to close, and this scattering pattern is by the thin uniformity coefficient that can increase light to close Density Distribution design.
On the other hand, breakthrough is arranged constantly also on the light guide plate manufacturing technology, for example comparatively succinct the and higher injection molding technology of precision on the processing procedure.The injection molding technology has the benefit of avoiding printing-ink material absorbing light, based on the injection molding technology, the light guide plate of injection molding can be etched scattering pattern, also scattering pattern can be designed and produced on die, promptly get the light guide plate of this scattering pattern behind the injection molding.For example No. 452088 " optical module of the trickle mirror surface structure of tool " patent cases of Republic of China's patent announcement disclose, and with the minute surface design of concavo-convex (giving prominence to) scattering pattern, increasing light derives efficient.
Say it more for example, utilize cutting (slot cut) technology to produce the long ditch type of rule structure, can be via the optical profile of the change modulates exiting surface of the width between long ditch type and the degree of depth.Say it more for example, all do the processing of prismatic lens at the light guide plate upper and lower faces, the prism pitch of bottom surface is by dredging to close, the design of drift angle then allows light upwards reflect, therefore luminous energy penetrates from the light guide plate surface equably, and has the directivity of suitable degree, improves front face brightness.
Along with the light guide plate development of technology, light guide plate has module structure to simplify the trend that reduces cost in recent years, i.e. the design of so-called integrated light guide plate, and its mode has (1) front processing with light guide plate, makes it have the function of prismatic lens; (2) utilize special forming technique (for example V-Cut), make diffusion barrier and prismatic lens consumption respectively reduce a slice; (3) when the light guide plate ejection formation, in propylene material, add the graininess material (as MMA) of a small amount of different refractivity, this kind light guide plate is by light and intergranular scattering process, allows light penetrate from the light guide plate surface.
The design of integrated light guide plate wherein has many choice problems that all face a difficult selection, and for example can reduce job sequence with diffusion layer is one-body molded simultaneously when making light guide plate, but directly makes the efficient that the diffusion point can the minimizing bright dipping on light guide plate.Though the material of for example adding again can increase the chance of scattering, more or less all can absorb the reduction that light produces service efficiency in light guide plate.
About printing or outstanding scattering pattern Density Distribution, promptly count from sparse to dense design since the light source place, can be by Republic of China's patent announcement No. 516671 " tool is input keyboard backlight evenly ", No. 493148 " manufacture method of liquid crystal indicator and light guide plate and light guide plate " and No. 493087 light guide plate. side light type planar light source device and liquid crystal indicator " etc. the patent case disclosed.
At the same time, the someone notices that the scattering pattern of light guide plate distributes, if merely by dredging to close, can not satisfy the requirement of uniformity coefficient.For example disclosed by No. 493055 " backlight dark corner elimination method and light guide plate thereof " patent cases of Republic of China's patent announcement, with the cold-cathode tube is the light guide plate of light source, handles to increase outgoing light homogeneity with closeer scattering pattern at the end face dark corner near light source.
Again with the explanation of backlight module example.Referring to Fig. 1, shown in Figure 2, produce its basic structure of side light type back light module of area source, (LED or cold-cathode tube-CCFL), light guide plate 102 (LGP), diffusion barrier (Diffuser) 104 and prismatic lens 105 spare parts such as (or claiming blooming, brightening piece) are formed by being attached to module bottom and lateral reflection film 103, light source 101.Wherein, the scattering pattern structure 106 of light guide plate 102 makes light guide plate have guide lights scattering direction, improves the briliancy of panel and guarantees the functions such as homogeneity of panel luminance.
The scattering pattern 106 of known technology has wire mark white ink, concavo-convex, wave lines, groove, mirror surface structure and dissymmetrical structure etc.In addition, consider that the area source of outgoing can be more even, then according to light quantity along with the phenomenon of successively decreasing away from light source, adjust the Size Distribution of scattering pattern, count by little 201 from light source and become big by 202 (seeing Fig. 3, Fig. 4).
Yet scattering pattern is simple changes from small to big or by dredging to close, can not satisfy the requirement of area source light uniformity coefficient.For example with cold-cathode tube (CCFL) as light source, CCFL end 203 (near the electrode part) causes the dark space 204 of light guide plate to need to handle to increase outgoing light homogeneity with closeer scattering pattern 205.Learnt by thumb rule that again light guide plate perpendicular light source direction both sides of the edge are darker, adjusting both sides of the edge concentration 301 can increase outgoing light homogeneity (seeing Fig. 7 and Fig. 8).
Therefore, the present invention proposes light guide plate and influenced by the end face reflection position, and its light quantity Density Distribution is not simple linear decrease relation, distributes but be parabolic type.Simultaneously, because known light guide plate pattern design is all adopted the thumb rule test and got, no certain basis designs so be devoted to find out the method that can follow for according to designing, to keep the stable of light guide plate and to increase briliancy, be fundamental purpose of the present invention.
Summary of the invention
The technical problem to be solved in the present invention is: at the problems referred to above, the object of the present invention is to provide a kind of new light conducting plate structure, its Density Distribution that proposes the micro-protuberance thing particularly is the parabolic type relation, the utilization parabolic formula is adjusted the scattering pattern CONCENTRATION DISTRIBUTION, can react the distribution of amount of light in the light guide plate efficiently and then increase uniformity coefficient, improving the disappearance of known integrated light conducting plate structure, and obtain an efficient uniform area light source.
Solving the technical scheme that technical matters of the present invention adopts is: apply to the side irradiation type light conducting plate structure with micro-protuberance thing in the side light type back light module, wherein the micro-protuberance thing pattern density of above-mentioned light guide plate distributes and is parabolic relation, promptly count from light source, micro-protuberance thing pattern distributes by close to dredging, arrive long-range the closelyest then gradually, obtain uniform surface light source through the design of above-mentioned parabolic density.
According to technique scheme, the Density Distribution that the present invention proposes the micro-protuberance thing is the parabolic type relation, except scattering pattern has micron-sized size and spacing, scattering pattern utilization parabolic formula can obtain best CONCENTRATION DISTRIBUTION, improves the uniformity coefficient of area source particularly and efficiently.
Beneficial effect of the present invention: in the present invention, a kind of new light conducting plate structure is provided, its Density Distribution that proposes the micro-protuberance thing particularly is the parabolic type relation, the utilization parabolic formula is adjusted the scattering pattern CONCENTRATION DISTRIBUTION, can react the distribution of amount of light in the light guide plate efficiently and then increase uniformity coefficient.
In addition, the design of light guide plate scattering pattern of the present invention, it is micro-protuberance thing with micron-sized size and spacing, the Density Distribution that adds the micro-protuberance thing is the parabolic type relation, can increase the uniformity coefficient of diffusion, produce the effect that luminous point is covered up, and the diffraction phenomenon of avoiding systematicness to distribute causing and can not improve area occupation ratio and cause the outgoing light quantity many earlier after few phenomenon.
And then, para-curve pattern design proposed by the invention, it is to design the pattern of light guide plate with one or more above para-curves according to the luminous point source and the size of light guide plate.
Description of drawings
Describe the present invention below in conjunction with the embodiment accompanying drawing.
Fig. 1 represents the backlight module synoptic diagram;
Fig. 2 represents the backlight module synoptic diagram;
Fig. 3 represents the Density Distribution of known light guide plate scattering pattern;
Fig. 4 represents the Density Distribution of known light guide plate scattering pattern;
Fig. 5 represents the Density Distribution of known light guide plate scattering pattern;
Fig. 6 represents the Density Distribution of known light guide plate scattering pattern;
Fig. 7 represents the density profile of another kind of known light guide plate scattering pattern;
Fig. 8 represents the density profile of another kind of known light guide plate scattering pattern;
Fig. 9 represents that scattering pattern of the present invention and scattering pattern Density Distribution are the parabolic relation synoptic diagram;
Figure 10 represents that scattering pattern of the present invention and scattering pattern Density Distribution are the parabolic relation synoptic diagram;
Figure 11 represents that another type scattering pattern Density Distribution of the present invention is the parabolic relation synoptic diagram;
Figure 12 represents that another type scattering pattern Density Distribution of the present invention is the parabolic relation curve;
Figure 13 represents the density profile of the first embodiment of the present invention;
Figure 14 represents the density profile of the first embodiment of the present invention;
Figure 15 represents the micro-protuberance thing part distribution plan of the second embodiment of the present invention;
Wherein: 101 light sources; 102 light guide plate; 103 reflection horizon; 104 diffusion layers;
105 prismatic lenses; 106 scattering patterns; 201 less scattering patterns;
202 big scattering patterns; 203 CCFL ends;
204 light sources cause the dark space in light guide plate corner;
205 big scattering patterns at the dark space in light guide plate corner;
301 big scattering patterns at dark space, light guide plate perpendicular light source direction edge;
401 micro-protuberance things of the present invention.
Embodiment
Referring to Fig. 9, Figure 10, for scattering pattern of the present invention and scattering pattern Density Distribution are parabolic relation synoptic diagram (the close distribution of another type scattering pattern of the present invention is the visible Figure 11 of parabolic relation synoptic diagram, Figure 12).Wherein, scattering pattern is a micro-protuberance thing 401 of the present invention.
The base diameter of micro-protuberance thing 401 of the present invention or side size range are that several microns (micro meter) are to hundreds of microns (0.1 micron taper thing to 800 micron diameters or the length of side), be several microns apart from scope between the micro-protuberance thing 401 and arrive hundreds of microns (0.1 micron to 800 microns), the design of this micron order scattering pattern size and spacing, except the uniformity coefficient that can increase diffusion with have the effect that luminous point is covered up, the area occupation ratio that also can not improve scattering pattern causes the few phenomenons in the many earlier backs of outgoing light quantity intensity.
Importantly, micro-protuberance thing 401 Density Distribution are the parabolic type relation, the Density Distribution of its irregular microtexture is except the distribution of amount of light in can the effecting reaction light guide plate and then increase uniformity coefficient, the diffraction phenomenon (being commonly called as rainbow) that can also avoid systematicness to distribute and caused.
Micro-protuberance thing 401 shapes of the present invention are hollow-cone bodies, and its true shape should be decided for the design of round, oval, square, rectangle, rhombus or asymmetric shape on the bottom of projection.
The production method of micro-protuberance thing of the present invention can utilize the LIGA processing procedure to make the die of this pattern, carry out again injection molding it.
Further specify, promptly at first selected backlight material and shape, determine the size and the degree of depth of micro-protuberance thing, based on parabola shaped fundamental formular Y=A (Y-Yo) ^2+B (Y-Yo)+C (or parabolic type derive formula), utilize Yo waypoint and the constant numerical value (A, B and C parameter) of adjusting parabolic formula, the Density Distribution of seeking best micro-protuberance thing 401.
Below will say in detail with embodiment.Wherein table one is the basic formula of first embodiment; And table two is A, B and C parameter values and the Yo waypoint of first embodiment.
Embodiment one is the CONCENTRATION DISTRIBUTION of 4 o'clock backlight.The light guide plate of 84mm * 60mm, making the bottom is the hollow pyramid of 40 μ m * 30 μ m, it highly is 5 μ m.At first according to table one, the increment Px of selected x direction is fixed value 125 μ m.The increment Py of Y direction is the formula basis with parabolic formula Y=A (Y-Yo) ^2+B (Y-Yo)+C, and with table two A, B, C and Yo, the formula 2 of Dai Huibiao one obtains the Coy value earlier, obtains the increment Py of Y direction again.The starting point coordinate that calculates back first the first five thrust of row is respectively (0,0) (0,0.18) (0,0.35) (0,0.53) (0,0.71).The uniformity coefficient measuring value of this light guide plate briliancy is 81%.Density Distribution such as Figure 13, shown in Figure 14.
Second embodiment is another type of CONCENTRATION DISTRIBUTION of 4 o'clock backlight.The light guide plate of 84mm * 60mm, making the bottom is the hollow pyramid of 40 μ m * 30 μ m, it highly is 5 μ m.Equally according to table one and table two, but the equal 62 μ m of displacement to the right of y direction even rows.The starting point coordinate that calculates back first the first five thrust of row is respectively (0,0) (0.062,0.18) (0,0.35) (0.062,0.53) (0,0.71).It is 86% that this light guide plate briliancy uniformity coefficient can reach.Micro-protuberance thing part distribution plan as shown in figure 15.
The uniformity coefficient of present embodiment (uniformity) calculate be according among the ANSI IT7.215-1992 to the definition of projection uniformity coefficient, be to measure resulting 9 measuring values from light output, take out maximum with minimum brightness value, the deviation of these two numerical value and 9 mean values is represented with percentage, be the uniformity coefficient that this projection is established.
In addition, light guide plate pattern of the present invention also can be done different variations according to the increase of light source, for example when bigger light guide plate area needs with both sides importing light source, pattern can be designed according to two para-curves, makes large-scale light guide plate also can present uniform briliancy.
Again for example when being light source with LED, also can according to light source design go out more a plurality of parabola calculation and micro-protuberance thing distribution pattern.
In sum, light guide plate innovation structure provided by the present invention has improved the shortcoming of known technology, and the briliancy that makes light guide plate represent reach suitable evenly.
Table one
| Px=0.04/Cox, Cox=0.32........................ formula 1 |
| Py=0.03/Coy, Coy=A (Y-Yo) ^2+B (Y-Yo)+C......... formula 2 |
Table two
| Y | ??Yo | ?A | ?B | ???? |
| 0～11 | ??0 | ?0.000136 | ?-0.00786 | ????0.17 |
| 11～5 0 | ??11 | ?0.000165 | ?-0.00209 | ????0.1 |
| 50～6 0 | ??50 | ?-0.00025 | ?0.0155 | ????0.27 |
Claims (5)
1, a kind of side irradiation type light conducting plate structure that applies in the side-light type module backlight with micro-protuberance thing, the micro-protuberance thing pattern density distribution that it is characterized in that above-mentioned light guide plate is parabolic relation, promptly count from light source, micro-protuberance thing pattern distributes by close to dredging, it is the closeest to arrive far-end then gradually, obtains uniform surface light source through above-mentioned parabolic density design.
2, light conducting plate structure according to claim 1 is characterized in that micro-protuberance thing shape is a hollow taper pattern structure, and above-mentioned taper pattern bottom shape can be rhombus, square, rectangle, circle, ellipse or asymmetric shape.
3, light conducting plate structure according to claim 2 is characterized in that micro-protuberance thing bottom is 0.1 micron taper thing to 800 micron diameters or the length of side.
4, light conducting plate structure according to claim 2 is characterized in that micro-protuberance thing spacing is 0.1 micron to 800 microns.
5, light conducting plate structure according to claim 1, when it is characterized in that the module backlight that uses has two sidelight sources, the pattern of the little projecture density of above-mentioned light guide plate is to get according to two parabolic density designs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA031240941A CN1542466A (en) | 2003-05-01 | 2003-05-01 | Light conducting plate structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA031240941A CN1542466A (en) | 2003-05-01 | 2003-05-01 | Light conducting plate structure |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100561660C (en) * | 2004-12-22 | 2009-11-18 | 鸿富锦精密工业（深圳）有限公司 | A kind of field emission light source and use the module backlight of this light source |
| CN101858508A (en) * | 2010-04-06 | 2010-10-13 | 友达光电股份有限公司 | Light source module |
| CN102242879A (en) * | 2010-05-10 | 2011-11-16 | 富士胶片株式会社 | Planar lighting device |
| CN102252230A (en) * | 2010-04-06 | 2011-11-23 | 友达光电股份有限公司 | Light source module |
| CN102588887A (en) * | 2007-07-27 | 2012-07-18 | 夏普株式会社 | Illumination device and liquid crystal display device |
| CN102981207A (en) * | 2011-09-06 | 2013-03-20 | 扬升照明股份有限公司 | Light guide plate and backlight module |
| US8419263B2 (en) | 2010-03-22 | 2013-04-16 | Au Optronics Corporation | Light source module provided with a light guide plate having reflective structure thereon |
| CN104169635A (en) * | 2012-03-30 | 2014-11-26 | 武藤工业株式会社 | Light-guide-plate creation method and device |
| CN104272016A (en) * | 2012-05-07 | 2015-01-07 | 科技信光控板有限公司 | Light guide plate structure controlling uniformity from central portion to edge, and lighting lamp using same |
| CN106292044A (en) * | 2015-06-01 | 2017-01-04 | 凌晖科技股份有限公司 | Double-sided display |
| CN113641038A (en) * | 2015-06-09 | 2021-11-12 | 瑞仪光电(苏州)有限公司 | Backlight module |
-
2003
- 2003-05-01 CN CNA031240941A patent/CN1542466A/en active Pending
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100561660C (en) * | 2004-12-22 | 2009-11-18 | 鸿富锦精密工业（深圳）有限公司 | A kind of field emission light source and use the module backlight of this light source |
| CN102588887A (en) * | 2007-07-27 | 2012-07-18 | 夏普株式会社 | Illumination device and liquid crystal display device |
| US8419263B2 (en) | 2010-03-22 | 2013-04-16 | Au Optronics Corporation | Light source module provided with a light guide plate having reflective structure thereon |
| CN101858508A (en) * | 2010-04-06 | 2010-10-13 | 友达光电股份有限公司 | Light source module |
| CN101858508B (en) * | 2010-04-06 | 2011-09-14 | 友达光电股份有限公司 | Light source module |
| CN102252230A (en) * | 2010-04-06 | 2011-11-23 | 友达光电股份有限公司 | Light source module |
| CN102242879A (en) * | 2010-05-10 | 2011-11-16 | 富士胶片株式会社 | Planar lighting device |
| CN102981207A (en) * | 2011-09-06 | 2013-03-20 | 扬升照明股份有限公司 | Light guide plate and backlight module |
| CN102981207B (en) * | 2011-09-06 | 2015-03-18 | 扬升照明股份有限公司 | Light guide plate and backlight module |
| CN104169635A (en) * | 2012-03-30 | 2014-11-26 | 武藤工业株式会社 | Light-guide-plate creation method and device |
| CN104272016A (en) * | 2012-05-07 | 2015-01-07 | 科技信光控板有限公司 | Light guide plate structure controlling uniformity from central portion to edge, and lighting lamp using same |
| CN104272016B (en) * | 2012-05-07 | 2018-07-24 | 明眼有限公司 | Control the optical plate structure of the uniformity from central part to edge and the headlamp using the optical plate structure |
| CN106292044A (en) * | 2015-06-01 | 2017-01-04 | 凌晖科技股份有限公司 | Double-sided display |
| CN113641038A (en) * | 2015-06-09 | 2021-11-12 | 瑞仪光电(苏州)有限公司 | Backlight module |
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