CN102073090B - Light guide plate and backlight module - Google Patents
Light guide plate and backlight module Download PDFInfo
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- CN102073090B CN102073090B CN 201010536818 CN201010536818A CN102073090B CN 102073090 B CN102073090 B CN 102073090B CN 201010536818 CN201010536818 CN 201010536818 CN 201010536818 A CN201010536818 A CN 201010536818A CN 102073090 B CN102073090 B CN 102073090B
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- printing ink
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/004—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles
- G02B6/0043—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles provided on the surface of the light guide
Abstract
The invention provides a light guide plate and a backlight module. The light guide plate comprises a bottom surface, a light entering surface and a light emitting surface, wherein the light emitting surface is arranged opposite to the bottom surface; the bottom surface comprises a plurality of mesh points; the mesh points comprise fluorescent powder; and scattered particles are added selectively. Phenomena such as color offset caused by accelerated aging of the fluorescent powder which is close to a light-emitting diode (LED) chip and reduction in light emitting efficiency are avoided.
Description
[technical field]
The present invention relates to technical field of liquid crystal display, particularly relate to a kind of LGP and comprise the backlight module of this kind LGP.
[background technology]
Because the liquid crystal of display panels itself does not have the characteristics of luminescence, thereby, for reaching display effect, need light supply apparatus be provided to display panels, like backlight module, its role is to provides the area source that briliancy is abundant and be evenly distributed to display panels.
In the prior art, backlight module all comprises light source, LGP and some other necessary parts, and the effect of LGP is the transmission direction of direct light line, makes light by the even outgoing of the exiting surface of LGP, and light source for example adopts light emitting diode (LED).Wherein, The structure of LED is shown in Fig. 1 (a) and Fig. 1 (b); Wherein the structure of LED comprises: yttrium aluminum garnet (YAG) fluorescent powder 10 and blue-light LED chip 20; Or comprising RGB (RGB) fluorescent powder 30 and UV (ultraviolet light) led chip 40, its mechanism that produces white light mainly contains following four kinds: one, blue-light LED chip+yellow fluorescent powder (like YAG); Two, blue-light LED chip+yellow fluorescent powder+red fluorescence powder; Three, blue-light LED chip+green emitting phosphor+red fluorescence powder; Four, UV led chip+RGB fluorescent powder.The general direct coating of fluorescent powder covers on the led chip or is evenly distributed in the encapsulating material of LED itself.
Moreover; The side light type back light module structure is as shown in Figure 2: several LED that emit white light 110 direct light into LGP 120 from LGP 120 sides; Light is propagated through total reflection in LGP 120; When light incided the site 130 on the LGP, some light will be by scattering particle scattering on the site 130 and the exiting surface outgoing directly over the LGP 120.
As stated, fluorescent powder coating method of the prior art mainly comprises following shortcoming: at first, LED can produce great amount of heat in luminescence process, and the accumulation of heat causes fluorescent powder coated portion temperature higher, and fluorescent powder non-refractory and accelerated deterioration; In addition, fluorescent powder has also reduced the luminescence efficiency of LED to reflection of light absorption loss.So there are shortcomings such as light efficiency decline is fast, color is drifted about greatly in time, luminescence efficiency is low in the LED of this kind coating method.Please refer to that LED is with the light efficiency situation of change of temperature among Fig. 3, the longitudinal axis is represented light efficiency among Fig. 3, and transverse axis is represented Celsius temperature, side's point expression YAG fluorescent powder, and round dot is represented InGaN (InGaN) blue led.As shown in Figure 3, it is conflicting to the high request of color that this LED changes the unfavorable condition that taken place and demonstration field with the light efficiency of temperature.
[summary of the invention]
The objective of the invention is to avoid fluorescent powder because cause colour cast and luminescence efficiency decline phenomenon near the led chip accelerated deterioration.
For realizing above-mentioned purpose, the present invention adopts following technical scheme:
A kind of LGP; Comprise bottom surface, incidence surface and exiting surface; Said exiting surface and said bottom surface are oppositely arranged, and said bottom surface comprises some sites, and said LGP adopts LED as light source; The light that said led light source sends is via the incidence surface incident of said LGP; Said LED is a blue-ray LED, and said site is divided into printing ink site and the fluorescent powder site of containing scattering particle, saidly contains the printing ink site of scattering particle and the mode that alternately arranges the fluorescent powder site is the printing ink site row and the alternately arrangement of fluorescent powder site row that contains scattering particle; The printing ink site size of the said printing ink site row that contains scattering particle from the light source light incident side by little increase, the size of the fluorescent powder site of said fluorescent powder site row from said light source incident opposite side by little increase.
The present invention provides a kind of backlight module simultaneously; Comprise LGP and led light source; Comprise bottom surface, incidence surface and exiting surface on the said LGP, said exiting surface and said bottom surface are oppositely arranged, and said bottom surface comprises some sites; Said led light source and said incidence surface are oppositely arranged; Said LED is a blue-ray LED, and said site is divided into printing ink site and the fluorescent powder site of containing scattering particle, saidly contains the printing ink site of scattering particle and the mode that alternately arranges the fluorescent powder site is the printing ink site row and the alternately arrangement of fluorescent powder site row that contains scattering particle; The printing ink site size of the said printing ink site row that contains scattering particle from the light source light incident side by little increase, the size of the fluorescent powder site of said fluorescent powder site row from said light source incident opposite side by little increase.
Preferably, said fluorescent powder site comprises: the potpourri of red fluorescence powder and green emitting phosphor; The perhaps potpourri of yellow fluorescent powder and red fluorescence powder.
Preferably, apart from light source light incident side behavior printing ink site, site row the most nearby.
Preferably, apart from light source incident opposite side behavior fluorescent powder site, site row the most nearby.
The composition of employed fluorescent powder comprises aluminate (for example YAG), silicate, phosphate or nitride in the present invention.
The principle of generating white light is among the present invention: red+green+blueness=white (R+G+B=W).
LED of the present invention inside is not coated with fluorescent powder.
Beneficial effect of the present invention is, because LED of the present invention inside is not coated with fluorescent powder, so fluorescent powder ends the dependence upon the near-thermal source, and the led color of having avoided the accelerated deterioration because of fluorescent powder to cause changes the problem that causes light efficiency to descend; Once more; Because the light that the optical texture of LGP has determined all exiting surface outgoing directly over the LGP all must be at least through the scattering of site particle; Thereby in scattering particle, add fluorescent powder; Fluorescent powder itself has the effect of scattering on the one hand, can guarantee that on the other hand the light that scatters out can blend uniform color, thereby further improve the leaded light efficient of LGP.
[description of drawings]
Fig. 1 (a) and Fig. 1 (b) are the structural representation of LED in the prior art.
Fig. 2 is the structural representation of side light type back light module in the prior art.
Fig. 3 be in the prior art LED with the light efficiency situation of change synoptic diagram of temperature.
Fig. 4 is the structural representation of side light type back light module among the present invention.
Fig. 5 is the synoptic diagram that the site adopts fluorescent powder to mix with printing ink in the embodiment of the present invention.
Fig. 6 is the synoptic diagram that the site adopts printing ink site and fluorescent powder site alternately to arrange in second embodiment of the present invention.
Fig. 7 is two-layer synoptic diagram for site in the 3rd embodiment of the present invention.
[embodiment]
For making above-mentioned purpose of the present invention, characteristic and advantage more obviously understandable, hereinafter is special lifts preferred embodiment of the present invention, and conjunction with figs., elaborates as follows:
As shown in Figure 4, be side light type back light module one-piece construction synoptic diagram among the present invention.Side light type back light module comprises some LED210, LGP 220.Wherein, LGP 220 comprises bottom surface, incidence surface and exiting surface, and exiting surface and bottom surface are oppositely arranged, and the bottom surface comprises some sites 230.Alternatively, exiting surface is connected with incidence surface.LED210 places LGP 220 sides, is oppositely arranged with incidence surface, and the light that LED210 sends is via the incidence surface incident of LGP 220.
In the embodiment of the present invention, LED210 inside no longer is coated with fluorescent powder, and the light that LED210 sends directly through package lens (lens) outgoing of a LED210 itself, that is: separates led chip and fluorescent powder; Simultaneously; Become the site material on the site 230 of LGP 220 by common scattering particle and to comprise fluorescent powder; And selectivity is added scattering particle; Thereby the blue light or the UV light excitated fluorescent powder on the site of inciding LGP 220 230 that send via LED210 like this blend white light, and the exiting surface that scatters to then directly over the LGP 220 forms uniform surface light source.
The principle of generating white light is among the present invention: red+green+blueness=white.As preferred implementation, the present invention can comprise following four kinds of schemes at least:
One, LED adopts blue-ray LED, and the site composition adopts fluorescent powder and the potpourri that contains the printing ink of scattering particle.
Particularly, in this kind embodiment, the composition of site can comprise fluorescent powder and contain the printing ink of scattering particle, fluorescent powder can for:
Yellow fluorescent powder; Perhaps
The potpourri of yellow fluorescent powder and red fluorescence powder; Perhaps
The potpourri of green emitting phosphor and red fluorescence powder.
Two, LED adopts the UV ultraviolet leds, and the composition of said site is the potpourri of red fluorescence powder, green emitting phosphor and blue colour fluorescent powder.
Three, LED adopts blue-ray LED, and said site is that alternately arrange printing ink site and the fluorescent powder site of containing scattering particle, and the composition of said fluorescent powder site is:
The potpourri of red fluorescence powder and green emitting phosphor; Perhaps
The potpourri of yellow fluorescent powder and red fluorescence powder.
Four, LED adopts the UV ultraviolet leds, and said site is two-layer, and ground floor is the fluorescent powder site, adopts the potpourri of red fluorescence powder, green emitting phosphor and blue colour fluorescent powder; The second layer is the printing ink site, adopts the printing ink that contains scattering particle.It is understandable that when the site was two-layer, LED also can adopt blue-ray LED, the ground floor of site can be yellow fluorescent powder, and the second layer is the printing ink site of containing scattering particle.
As preferred implementation, used herein to fluorescent powder be the fluorescent powder that comprises aluminate serial fluorescent powder, silicate series fluorescent powder, series of phosphate fluorescent powder or nitride series.
As shown in Figure 5, be the synoptic diagram of site composition employing fluorescent powder and printing ink hybrid plan in the embodiment of the present invention, promptly aforementioned schemes one.Comprise LED310, LGP 320 and site 330 among Fig. 5.The composition of site 330 can be: yellow fluorescent powder and the printing ink that contains scattering particle; Perhaps yellow fluorescent powder, red fluorescence powder and contain the printing ink of scattering particle; Perhaps green emitting phosphor, red fluorescence powder and contain the printing ink of scattering particle.
In fluorescent powder and embodiment that printing ink mixes, when fluorescent powder evenly was mixed and made into site 330 with the printing ink that contains scattering particle, site 330 sizes did not have clear and definite requirement, can design according to actual needs.In this embodiment, the diameter of site 330 can be 0.2～0.4 millimeter, and particularly, minimum printing net-point can be accomplished 0.2mm, usually about 0.4mm.Owing to the dot number in the half tone is very many, among Fig. 5 the structure of site has been carried out simplification and illustrated.
In addition; When said LED310 adopts the UV ultraviolet leds; The composition of said site 330 can be the potpourri of red fluorescence powder, green emitting phosphor and blue colour fluorescent powder, and promptly aforementioned schemes two, and need not add the printing ink that contains scattering particle this moment; The diameter of site 330 is all identical with first embodiment with arrangement mode, repeats no more here.
As shown in Figure 6, be the synoptic diagram that site in second embodiment of the present invention adopts printing ink site and fluorescent powder site alternately to arrange, promptly aforementioned schemes three.Comprise LED410, LGP 420, fluorescent powder site 430a and printing ink site 430b among Fig. 6.In this embodiment; Alternately arranging of fluorescent powder site 430a and printing ink site 430b adopts row to replace the mode of arranging; The printing ink site row of promptly being made up of fluorescent powder site 430a fluorescent powder site row of forming and the printing ink site 430b that contains scattering particle is alternately arranged, and is not limited to this in the practical application.Wherein, the composition of fluorescent powder site 430a is: the potpourri of red fluorescence powder and green emitting phosphor; The perhaps potpourri of yellow fluorescent powder and red fluorescence powder.
In order to guarantee the homogeneity of color; Be that the final light that produces of exiting surface is white light; In this embodiment; The arrangement mode of fluorescent powder site 430a and printing ink site 430b is following: the light that light source led 410 sends is by light source light incident side S1 incident; Said printing ink site 430b that contains scattering particle and fluorescent powder site 430a adopt row alternately to arrange, the printing ink site 430b size of said printing ink site row from light source light incident side S1 by little increase, the fluorescent powder site 430a size of said fluorescent powder site row from light source incident opposite side (being the opposite side of light source light incident side) S2 by little increase; And apart from light source light incident side S1 delegation site the most nearby is printing ink site 430b, is fluorescent powder site 430a apart from light source incident opposite side S2 delegation site the most nearby.
Particularly, after blue light incides yellow fluorescent powder, can be converted into gold-tinted, wherein most of light will shine outside the LGP 420, and few part is propagated in LGP 420, up to being scattered away; Blue light has the part light scattering outside LGP 420 after inciding printing ink site 430b, and part continues in LGP 420, to propagate; Blue light incides blank space, will be continued in LGP 420, to propagate by total reflection.The gold-tinted that is transformed incides on the 430b of printing ink site, and outside the LGP 420 that partly is reflected out, part continues in LGP 420, to propagate; Gold-tinted incides on the 430a of fluorescent powder site, and part is scattered out LGP 420, and part continues in LGP 420, to propagate.Blue light incides the 430a outgoing of fluorescent powder site, and therefore, the color homogeneity of LGP 420 light is embodied in the blue light and the gold-tinted proportions constant of outgoing.At light source light incident side S1 place, because the light of incident all is blue light, so will there be bigger fluorescent powder site 430a just can blend white light near LGP 420.Along with light in 420 li propagation of LGP; The shared ratio of LGP 420 inner gold-tinteds constantly increases; Therefore need reduce the ratio that blue light is converted into gold-tinted, promptly fluorescent powder site 430a reduces, and printing ink site 430b size can be regulated according to the brightness of LGP 420.
As shown in Figure 7, for site in the 3rd embodiment of the present invention is two-layer synoptic diagram, promptly aforementioned schemes four.Comprise LGP 520, fluorescent powder site 530a and printing ink site 530b among Fig. 7.The site is divided into two-layer up and down, and the upper strata is the fluorescent powder site 530a of coating fluorescent powder, and the printing ink site 530b of scattering particle is contained in lower floor for coating.Wherein, fluorescent powder site 530a adopts the potpourri of red fluorescence powder, green emitting phosphor and blue colour fluorescent powder.
Thus, the present invention makes LED inside no longer be coated with fluorescent powder through LED and fluorescent powder are separated from each other, avoided causing that because of the LED heating causes the accelerated deterioration of fluorescent powder led color changes, and then the problem that causes light efficiency to descend.In scattering particle, add the mode of fluorescent powder, one side has been utilized the dispersion effect of fluorescent powder itself, can guarantee that on the other hand the light that scatters out blends uniform color, has improved the leaded light efficient of LGP.
The site size of LGP changes with size, panel size, typography, the ink type of dot spacing among the present invention, can adjust according to the design demand of specific product.For example, when with the side incident type televisor display device of liquid crystal indicator of the present invention as 42 time, the site diameter scope of the used LGP of its backlight module roughly is advisable at 0.4mm～1.4mm.
The present invention is described by above-mentioned related embodiment, yet the foregoing description is merely the example of embodiment of the present invention.Must be pointed out that disclosed embodiment does not limit scope of the present invention.On the contrary, being contained in the spirit of claims and the modification and impartial setting of scope includes in scope of the present invention.
Claims (5)
1. LGP; Comprise bottom surface, incidence surface and exiting surface; Said exiting surface and said bottom surface are oppositely arranged, and said bottom surface comprises some sites, and said LGP adopts LED as light source; The light that said led light source sends is via the incidence surface incident of said LGP; It is characterized in that: said LED is a blue-ray LED, and said site is divided into printing ink site and the fluorescent powder site of containing scattering particle, saidly contains the printing ink site of scattering particle and the mode that alternately arranges the fluorescent powder site is the printing ink site row and the alternately arrangement of fluorescent powder site row that contains scattering particle; The printing ink site size of the said printing ink site row that contains scattering particle from the light source light incident side by little increase, the size of the fluorescent powder site of said fluorescent powder site row from said light source incident opposite side by little increase.
2. backlight module; Comprise LGP and led light source; Said LGP comprises bottom surface, incidence surface and exiting surface, and said exiting surface and said bottom surface are oppositely arranged, and said bottom surface comprises some sites; Said led light source and said incidence surface are oppositely arranged; It is characterized in that: said LED is a blue-ray LED, and said site is divided into printing ink site and the fluorescent powder site of containing scattering particle, saidly contains the printing ink site of scattering particle and the mode that alternately arranges the fluorescent powder site is the printing ink site row and the alternately arrangement of fluorescent powder site row that contains scattering particle; The printing ink site size of the said printing ink site row that contains scattering particle from the light source light incident side by little increase, the size of the fluorescent powder site of said fluorescent powder site row from said light source incident opposite side by little increase.
3. backlight module according to claim 2 is characterized in that: the composition of said fluorescent powder site is:
The potpourri of red fluorescence powder and green emitting phosphor; Or
The potpourri of yellow fluorescent powder and red fluorescence powder.
4. backlight module according to claim 2 is characterized in that: apart from light source light incident side behavior printing ink site, site row the most nearby.
5. backlight module according to claim 2 is characterized in that: apart from light source incident opposite side behavior fluorescent powder site, site row the most nearby.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010536818 CN102073090B (en) | 2010-11-05 | 2010-11-05 | Light guide plate and backlight module |
| PCT/CN2010/079205 WO2012058833A1 (en) | 2010-11-05 | 2010-11-26 | Light guide plate and backlight module |
| US12/997,473 US8702293B2 (en) | 2010-11-05 | 2010-11-26 | Light guide plate and backlight module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010536818 CN102073090B (en) | 2010-11-05 | 2010-11-05 | Light guide plate and backlight module |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102073090A CN102073090A (en) | 2011-05-25 |
| CN102073090B true CN102073090B (en) | 2012-08-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010536818 Active CN102073090B (en) | 2010-11-05 | 2010-11-05 | Light guide plate and backlight module |
Country Status (2)
| Country | Link |
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| CN (1) | CN102073090B (en) |
| WO (1) | WO2012058833A1 (en) |
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| TWI447450B (en) * | 2011-11-30 | 2014-08-01 | Au Optronics Corp | Light guide panel, backlight module, and manufacturing method thereof |
| CN103322440B (en) * | 2012-03-23 | 2015-06-03 | 潘文莘 | Luminous module changing light advancing path through interior reflection |
| CN102661544B (en) * | 2012-04-27 | 2015-09-02 | 深圳市华星光电技术有限公司 | Backlight module and liquid crystal indicator |
| CN103277710B (en) * | 2012-10-30 | 2017-07-18 | 厦门天马微电子有限公司 | A kind of back light system and liquid crystal display module |
| KR102090036B1 (en) * | 2013-09-16 | 2020-03-18 | 삼성디스플레이 주식회사 | Backlight assembly and display divece having the same |
| CN104570191A (en) * | 2013-10-24 | 2015-04-29 | 华为终端有限公司 | Light guide plate and backlight module |
| CN103675989A (en) * | 2013-12-20 | 2014-03-26 | 康佳集团股份有限公司 | Light guide plate or diffusion plate used for LED backlight module and manufacturing method of light guide plate or diffusion plate |
| CN103818131B (en) * | 2014-02-11 | 2016-08-17 | 青岛歌尔声学科技有限公司 | A kind of method of printing-ink site on reflector plate |
| CN104269144B (en) * | 2014-09-30 | 2018-08-14 | 深圳市华星光电技术有限公司 | Field color-sequential method liquid crystal display device and its color control method |
| CN105717698A (en) * | 2014-12-04 | 2016-06-29 | 南京瀚宇彩欣科技有限责任公司 | Quantum tube, backlight module and liquid crystal display device |
| CN104595804B (en) * | 2014-12-12 | 2018-04-27 | 青岛歌尔声学科技有限公司 | A kind of backlight module and a kind of display device |
| CN105988159A (en) * | 2015-06-30 | 2016-10-05 | 乐视致新电子科技（天津）有限公司 | Fabrication method of light guide board, backlight module set and display device |
| CN105093387B (en) * | 2015-07-31 | 2018-12-07 | 深圳市华星光电技术有限公司 | Light guide plate, backlight module and display device |
| CN105929480A (en) * | 2016-04-12 | 2016-09-07 | 苏州星烁纳米科技有限公司 | Novel light guide plate and application thereof |
| CN105891936B (en) | 2016-05-20 | 2019-11-01 | 京东方科技集团股份有限公司 | Light-guide device and preparation method thereof and backlight module |
| CN106324746B (en) * | 2016-09-23 | 2019-08-30 | 纳晶科技股份有限公司 | Light guide plate, backlight module and display device |
| CN106569363A (en) * | 2016-10-21 | 2017-04-19 | 青岛海信电器股份有限公司 | Backlight module and manufacturing method thereof |
| CN107327747A (en) * | 2017-06-26 | 2017-11-07 | 青岛海信电器股份有限公司 | A kind of backlight module and display device |
| CN109427303B (en) * | 2017-08-21 | 2021-01-26 | 京东方科技集团股份有限公司 | Display panel, manufacturing method thereof, display method and display device |
| CN208041696U (en) * | 2018-04-16 | 2018-11-02 | 京东方科技集团股份有限公司 | Backlight, backlight module and display device |
| CN109186494A (en) * | 2018-07-30 | 2019-01-11 | 深圳阜时科技有限公司 | A kind of method for sensing |
| CN110906272B (en) * | 2018-09-14 | 2021-11-16 | 深圳市绎立锐光科技开发有限公司 | Light source device and car light |
| CN110045454B (en) * | 2019-05-22 | 2024-04-02 | 江苏铁锚玻璃股份有限公司 | Unidirectional light-emitting guide light plate and manufacturing method thereof |
| CN111176045A (en) * | 2020-03-02 | 2020-05-19 | 辽宁科技大学 | TFT liquid crystal display module capable of controlling transparent display in switchable mode |
| CN113311535B (en) * | 2021-05-18 | 2022-05-17 | 烽火通信科技股份有限公司 | Optical fiber ribbon and optical cable |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2012058833A1 (en) | 2012-05-10 |
| CN102073090A (en) | 2011-05-25 |
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Denomination of invention: Light guide plate and backlight module Effective date of registration: 20190426 Granted publication date: 20120822 Pledgee: Bank of Beijing Limited by Share Ltd Shenzhen branch Pledgor: Shenzhen Huaxing Optoelectronic Technology Co., Ltd. Registration number: 2019440020032 |
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