CN102095141A - Backlight module and display equipment - Google Patents
Backlight module and display equipment Download PDFInfo
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- CN102095141A CN102095141A CN2011100426886A CN201110042688A CN102095141A CN 102095141 A CN102095141 A CN 102095141A CN 2011100426886 A CN2011100426886 A CN 2011100426886A CN 201110042688 A CN201110042688 A CN 201110042688A CN 102095141 A CN102095141 A CN 102095141A
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Abstract
The invention discloses a backlight module and display equipment. The backlight module comprises a light source and a light guide plate, wherein the light guide plate is provided with six faces which comprise an incident face, an emergent face, a reflecting face, a first side face, a second side face and a third side face; the incident face faces the light source for receiving light from the light source; the emergent face is used for outputting the light from the light source; the reflecting face is arranged opposite to the emergent face; and the reflecting face of the light guide plate is provided with a reflective coating. Through the backlight module and the display equipment, the problem of more complex structure of the backlight module in the prior art can be solved, and the structure of the backlight module can be further simplified.
Description
Technical field
The present invention relates to field of display devices, in particular to a kind of module backlight and display device.
Background technology
Liquid crystal material has been widely used in LCD (the Liquid Crystal Display as different sizes such as TV, computer, mobile phone, personal digital assistant and various instrument and meters, abbreviate LCD as) on, liquid crystal material is not self luminous, in order to reach the video picture purpose, be necessary for panel of LCD a kind of planar light source device is provided, its function is to provide briliancy abundant to panel of LCD, and the area source that is evenly distributed is as module backlight.
Prior art provides a kind of module backlight 01, as shown in Figure 1, mainly by: light source 016, reflector 017, reflector plate 015, LGP 014, (descending) diffusion sheet 011, (level) prismatic lens 013, (vertically) prismatic lens 014, (on) diffusion sheet 011 forms.
Wherein, this light source can be arranged at LGP one side (being generally the bottom side) or relatively both sides (being generally the left and right sides) or " U " type three sides (being generally the bottom side and the left and right sides), and with light emission to this LGP.The effect of this LGP is to guide the light transmission direction, and light is evenly penetrated by the expectation exiting surface of LGP.Because it is the light that sends from light source has decay conductive process,, darker away from the part of light source so LGP is brighter near light part far away.So, for improving the briliancy and the uniformity of LGP, common one side setting " v " type groove or diffusion site at LGP, in order to destroy the total reflection condition of light in the LGP internal transmission, and make its scattering bringing up to the uniformity of tabula rasa emergent ray, and then improve the overall performance of back light source system.The size of this site, density all have different designs, and diffusion principle of describing in " diffusion point a method " as described above is to adapt to different back light source structures.
The patent No. provides a kind of back light source system for the patent of CN 101435892A, and as shown in Figure 2, backlight unit possesses light source 1, LGP 2, diffusion sheet 3, concentration piece 41,51 and reflector plate 6.Concentration piece 41,51 comprises first prismatic lens 41 and second prismatic lens 51.Be provided with light source 1 in the mode relative with at least one side 2a of LGP 2.Be provided with diffusion sheet 3 in the mode relative with the upper surface 2c of LGP 2.Be provided with reflector plate 6 in the mode relative with the lower surface 2b of LGP 2.Be provided with first prismatic lens 41 in the mode relative with diffusion sheet 3.With across first prismatic lens 41 and the mode relative with diffusion sheet 3 is provided with second prismatic lens 51.
LGP 2 at least with a side 2a be incidence surface, with side 2a roughly the upper surface 2c of quadrature be exiting surface.The light of light source 1 is from the side 2a incident of LGP 2, penetrates obliquely from the upper surface 2c of LGP.Understand coalescences to the vertical direction bending by two first prismatic lenses 41,51 from LGP 2 respectively by the light that diffusion sheet 3 incides concentration piece 41,51.The light that penetrates from the lower surface 2b of LGP 2 incides LGP 2 after by reflecting plate 6 reflections once more.
Yet, the inventor finds, though above-mentioned method can effectively reduce near the light inlet inequality of light source, and can improve positive briliancy by the light harvesting effect of prismatic lens, the passive dependence reflector plate that conventional light source adopted is reflective, the labyrinth of prismatic lens light harvesting but this light-source system has still followed, the whole light source system has used 6 parts altogether, and structure is comparatively complicated.
Summary of the invention
At the problem of back light module unit structure more complicated of the prior art and propose the present invention, for this reason, main purpose of the present invention is to provide a kind of module backlight and display device, to address the above problem.
To achieve these goals, according to an aspect of the present invention, provide a kind of module backlight.This module backlight comprises: light source; LGP, this LGP have six faces, and these six faces comprise: incidence surface towards light source, is used to receive the light from light source; Exiting surface is used to export the light from light source; Reflecting surface is oppositely arranged with exiting surface; First side is oppositely arranged with incidence surface; Second side and the 3rd side are oppositely arranged, and wherein, are provided with reflective coating at the reflecting surface of LGP.
To achieve these goals, according to a further aspect in the invention, provide a kind of display device.This display device comprises module backlight provided by the present invention.
By the present invention, adopt the module backlight that comprises with the lower part: light source; LGP, this LGP have six faces, and these six faces comprise: incidence surface towards light source, is used to receive the light from light source; Exiting surface is used to export the light from light source; Reflecting surface is oppositely arranged with exiting surface; And first side, second side and the 3rd side, wherein, reflecting surface at LGP is provided with reflective coating, because the reflective coating in the reflecting surface setting of LGP has been realized the function of reflector plate in the prior art, thereby can reflector plate no longer be set at module backlight, thereby solved the problem of back light module unit structure more complicated of the prior art, and then reached simplification back light module unit structure effect.
Description of drawings
The accompanying drawing that constitutes the application's a part is used to provide further understanding of the present invention, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the schematic diagram according to a kind of module backlight of prior art;
Fig. 2 is the schematic diagram according to the another kind of module backlight of prior art;
Fig. 3 is the schematic diagram according to the module backlight of the embodiment of the invention;
Fig. 4 is the schematic diagram according to the leaded light principle of the incidence surface of the LGP of the embodiment of the invention;
Fig. 5 is the schematic diagram according to the leaded light principle of the reflecting surface of the LGP of the embodiment of the invention;
Fig. 6 is the directions X perspective view of module backlight shown in Figure 3;
Fig. 7 is the Z direction projection figure of module backlight shown in Figure 3;
Fig. 8 is the Z direction projection figure of module backlight shown in Figure 3;
Fig. 9 is a H a kind of local enlarged diagram partly shown in Figure 8; And
Figure 10 is a H another kind of local enlarged diagram partly shown in Figure 8.
The specific embodiment
Need to prove that under the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.Describe the present invention below with reference to the accompanying drawings and in conjunction with the embodiments in detail.
Fig. 3 is the schematic diagram according to the module backlight of the embodiment of the invention.
As shown in Figure 3, this module 02 backlight comprises: light source 023; LGP 022, this LGP 022 has six faces, and these six faces comprise: incidence surface 022a towards light source 023, is used to receive the light from light source; Exiting surface 022b is used to export the light from light source; Reflecting surface 022d, 022b is oppositely arranged with exiting surface; And the first side 022c, the second side 022e and the 3rd side 022f, wherein, be provided with reflective coating at the reflecting surface 022d of LGP.
Because the reflective coating in the reflecting surface setting of described LGP has been realized the function of reflector plate in the prior art, thereby can reflector plate no longer be set at module backlight, thereby solved the problem of back light module unit structure more complicated of the prior art, and then reached the effect of simplifying back light module unit structure.
Preferably, any one among the first side 022c of LGP, the second side 022e and the 3rd side 022f or a plurality of face also are provided with reflective coating.By reflecting surface 022d, the first side 022c, the second side 022e and the 3rd side 022f reflective coating is set all, can farthest reduces the light loss consumption, and then can improve the brightness of LGP exiting surface at LGP.
Preferably, above-mentioned module backlight can also comprise: diffusion sheet, and with the adjacent setting of exiting surface of LGP.By diffusion sheet, can play further diffusion to light, and then can make the luminous more even of module backlight from the LGP exiting surface.
Preferably, module backlight can be made up of LGP, light source, prismatic lens and diffusion sheet, further preferably, module backlight can be made up of LGP, light source and diffusion sheet, thereby make module backlight only be double-decker, than 6 layers of structure of prior art, the very big structure of having simplified module backlight.
Preferably, the exiting surface of LGP and/or reflecting surface are waveform configuration.Owing to be arranged on the exiting surface of LGP and/or the waveform configuration of reflecting surface has been realized the function of prismatic lens in the prior art, thereby can prismatic lens no longer be set, thereby can simplify back light module unit structure further at module backlight.
Preferably, the cross section of waveform configuration be following any one or multiple: triangle, circle, ellipse, parabola shaped and hyperbola.
Preferably, module backlight also can only be made up of above-mentioned LGP and light source, and under this kind situation, module backlight is a single layer structure only, has simplified the structure of module backlight the biglyyest.
Preferably, waveform configuration is made of prism array.
Preferably, at least one waveform of above-mentioned waveform configuration is provided with a plurality of bulge-structures and sunk structure.Because bulge-structure and sunk structure can play the diffusion of light, thereby can play better light diffusion to the LGP surface of emission, thereby can make the surface of emission play better emission effect, and then improve the brightness of exiting surface and reduced the light loss consumption.
Preferably, above-mentioned sunk structure and/or bulge-structure are circular, near the diameter of the sunk structure of described light source and/or bulge-structure less than away from the depression mechanism of light source and/or the diameter of bulge-structure.
Preferably, be lower than density near the density of the sunk structure of light source away from the depression mechanism of light source.Because higher in the brightness near the LGP of light source one side, thereby littler by what will be provided with near the diameter of the sunk structure of light source, the density of sunk structure is lower, can be so that more even to the diffusion of light.
Structure below in conjunction with above-mentioned module backlight specifically describes LGP light harvesting blast principle of the present invention:
Light in inciding transparent substance is when meeting total reflection condition, according to total reflection principle, light will be done endless total reflection transmission and can not penetrate from upper and lower surface in this transparent substance such as PMMA, penetrate until the whole losses of luminous energy or from useless end face.The embodiment of the invention can illustrate how to destroy the purpose that the light total reflection condition reaches illumination and blast by the optical principle of LGP material.
Below set forth the realization of LGP illumination purpose:
General LGP material is polymetylmethacrylate (POLYMETHYL METHACRYLATE, MA is polymerized by monomer M), or is called " acrylic ", and its refraction coefficient is approximately 1.49, so the cirtical angle of total reflection is approximately 42.2 ° relatively.Total reflection phenomenon will take place in light when just, needing only incidence angle greater than 42.2 °.
For light can be penetrated from the surface of hope, promptly the condition of destroying total reflection with optical term.Light source imports the light in the LGP thus, referred to herein as incident light, the normal angle of supposing incident light and acrylic plate up and down is greater than 42 °, by total reflection principle as can be known, the theorem that this light can be in the acryl medium equals angle of reflection according to incidence angle is to and fro done total reflection, and light is transmitted in LGP.When light runs into the upper and lower surface of wedge shape, the angle between incidence angle and the surface normal (or lower surface), promptly incidence angle can diminish because of narrow gradually surface.And when incidence angle during less than the cirtical angle of total reflection, light promptly appears from narrow surface, because of the incidence angle that its total reflection condition is diminished is gradually destroyed, and reaches the effect of illumination.Since away from the light intensity of source ends a little less than, so general LGP at long-range thinner thickness, the light of derivation is more, and the thickness of close to sources end is thicker, the light of derivation is less.This thin shape in thick one side, one side is referred to as wedge shape.
The below realization of explanation LGP blast purpose:
Destroying total reflection according to above-mentioned wedges method and realize the illumination purpose, can continue to extend this favourable function of expansion, just the wedge shape of macroscopic view carry out microcosmicization, is little wedge shape array of a plurality of repetitions with a clapboard differential.
There is following comparing result in the technical scheme that can find out technical scheme provided by the present invention and prior art thus:
Flat light guide plate of the prior art does not have light or has only light seldom to penetrate from upper and lower surface because total reflection takes place.
Wedge shape LGP of the prior art: the light of a thicker end generation total reflection is many, and the light that total reflection does not take place is few, and therefore, the light that reflects the surface is just few; The light of a thin end generation total reflection is few, and the light that total reflection does not take place is many, and therefore, the light that penetrates the surface is just many.
As an example of waveform configuration, there are following characteristics in the little wedge shape LGP for the embodiment of the invention provided:
(1) the microcosmic degree of little wedge shape is high more, and the quantity of little wedge shape array is just many more in the unit length, and the degree of destroying total reflection is just high more, so it is just many more to penetrate the light on surface, the closeness of light is also high more, so brightness is also high more.
(2) little wedge shape is seen and is a little prism from another angle, and the function of prism according to the light refraction law as can be known, has the effect that changes radiation direction, makes original scattered light, gather in direction that we wish and angular range and penetrate, thereby increase the brightness of facing.Its blast principle, exactly the light of part small angle in the scattered light is gathered in direction that we wish and angular range through the micro-structural (being little prism) of upper surface and penetrated, part scattered light with great visual angle is then from little prism reflected back backlight LGP of upper surface, after the reflection of the reflection plated film of lower surface, again be used, final also in direction that we wish and angular range, penetrate.As shown in Figure 4 and Figure 5.
(3) as shown in Figure 4, the horizontal direction micro-structural of upper surface can be used for gathering the scattered light parallel with the YZ coordinate plane, therefore can improve brightness 50%; As shown in Figure 5, the vertical direction micro-structural of lower surface can be used for gathering the scattered light parallel with the XZ coordinate plane, therefore can improve brightness 50% again.Thereby preferably, the exiting surface and the reflecting surface of LGP are waveform configuration.
Therefore, after upper and lower surface all added micro-structural, its function can replace two prismatic lenses of requisite level and vertical direction in the traditional scheme fully.
Fig. 6 is the directions X perspective view of module backlight shown in Figure 3, and in the drawings, surface of emission 022d is provided with luminous plated film.
The present invention is just by turning to traditional LGP wedge shape a LGP that is made of a plurality of little wedge shapes, make a plurality of little wedge shapes realize the light harvesting effect of gathering of plural prism, be able to realize the blast purpose under the situation of two prismatic lenses in by light source in the cancellation tradition.
Need to prove in addition, little wedge shape in the micro-structural of the above upper and lower surface or little prism cross sectional shape only are that example illustrates its principle with the triangle, in fact in addition, also comprise the complex section that constitutes by various geometries such as circle, ellipse, parabola, hyperbolas.
The realization of LGP 022 diffusion function:
In the present invention program (as shown in Figure 3), in the micro-groove surface of the lower surface 022d of LGP 022 mould increases as Fig. 9 again H-(j) " salient point " (also being bulge-structure) or as Figure 10 in H-(k) " pit " (sunk structure as described in also being), to realize the diffusion of light.Details are as follows:
When a branch of light incides in the LGP, when projecting micro-groove lip-deep " salient point " or " pit " again, because the surface of " salient point " or " pit " is a curved surface, rather than plane, the normal at every bit place is a straight line through the center of circle on the curved surface, therefore different corresponding several normals of nothing that form of point are radial arrangement on the curved surface, all can produce a different incidence angle with a branch of light to the different normal of each bar, also will produce numerous different refraction angle or angle of reflection, thereby produced and do not had several different refract lights or reverberation, and be radial arrangement, finally realized the diffusion of light.
The placement scheme of " salient point " or " pit " is: the diameter near the part " salient point " of light source or " pit " is little, distribution density is low; Diameter away from light part far away " salient point " or " pit " is big, distribution density is high, and diameter, distribution density are the gradual change state variation.The main purpose of this kind distribution is to wish the less light of part scattering that the intensity of light source is stronger; And the more weak more light of part scattering of the intensity of light source reaches the even brightness requirement.Because stronger near the position light of light source, the diameter of " salient point " or " pit " is little, distribution density is low, just can the less light of scattering; Away from the position light of light a little less than, the diameter of " salient point " or " pit " is big, distribution density is high, just can the more light of scattering.
In addition, at 022c near LGP 022,022e, the area part 022g of three faces of 022f (seeing thick two-dot chain line area surrounded among Fig. 7), because catoptrical reason, part " bounce-back " phenomenon that changes from weak to strong can appear in light intensity in this long and narrow zone, so when above-mentioned " salient point " or " pit " diameter, when distribution density is the gradual change state variation and enters in this long and narrow zone, the diameter of " salient point " or " pit ", the distribution density height will be reverse gradual change and arrange, be that original diameter is ascending, density from low to high, descending at this regional diameter, density is ascending.Reaching irradiant whole homogenising, rather than edge shinny phenomenon suddenly appears.
What emphasize in addition, is that above " salient point " or " pit " only is the example explanation with the sphere curved surface.In fact " salient point " or " pit " that also comprises various complex geometric shapes such as cylindrical, prismatic, elliptical cylinder-shape in addition.
Being achieved as follows of LGP 022 reflection function:
In LGP 022 of the present invention, except that incidence surface 022a and exiting surface 022b, all the other four face 022c, 022d, 022e, 022f all increase reflective coating, to guarantee the effective utilization and the simplified structure of light.
The purpose of surface coating is:
When (1) preventing that light from transmitting in LGP, cause the loss of luminous energy.
After making that light is injected LGP 022 from incidence surface 022a, all penetrate from exiting surface 022b, play illuminating effect to be utilized by us.After light is injected LGP,, also can penetrate, cause the loss of luminous energy from all the other four face 022c, 022d, 022e, 022f except major part penetrates by our utilization from exiting surface 022b.Added be used for reflective surface coating after, four face 022c, 022d, 022e, 022f not only can not penetrate the loss that light causes luminous energy again, and the light of reflectance film reflected back can be reused and finally allow it penetrate from exiting surface 022b.
(2) another function of 022d surface coating is, in order to replace the reflector plate (as 015 among Fig. 1) in the conventional solution.
Behind the reflector plate in the cancellation conventional solution, the integrated level of LGP is higher, and back light module unit structure is also further simplified and optimized simultaneously.
(3) the light harvesting brightness enhancement function of reinforcement LGP 022: in the light harvesting brightness enhancement function of LGP 022, detailed description was arranged once, part in LGP scattered light with great visual angle is when little prism of upper surface reflects, can be reflected by the reflection plated film of lower surface, again be used then, final also in direction that we wish and angular range, penetrate, make luminous energy obtain the most effective utilization.
The embodiment of the invention also provides a kind of display device, and this display device comprises the module backlight that above-mentioned arbitrary embodiment is mentioned.
This display device can be the LCD of different sizes such as TV, computer, mobile phone, personal digital assistant (PersonalDigital Assistant abbreviates PDA as), MP4, handheld device (Handheld game console), GBA (GameBoy Advance SP), PSP (Play Station Portable), NDS (Nintendo DS), ipod touch4 and various instrument and meters.Light source radiation modality light in the past is reflective, also can be transmission-type backlight.
As can be seen from the above description, the present invention can simplify back light module unit structure effectively.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. module backlight comprises:
Light source;
LGP has six faces, and described six faces comprise:
Incidence surface towards described light source, is used to receive the light from described light source;
Exiting surface is used to export the light from described light source;
Reflecting surface is oppositely arranged with described exiting surface; And
First side, second side and the 3rd side,
It is characterized in that, be provided with reflective coating at the reflecting surface of described LGP.
2. module backlight according to claim 1 is characterized in that, any one in first side of described LGP, second side and the 3rd side or a plurality of face also are provided with reflective coating.
3. module backlight according to claim 1 is characterized in that also comprising:
Diffusion sheet is with the adjacent setting of exiting surface of described LGP.
4. module backlight according to claim 3 is characterized in that, described module backlight is made up of described LGP, described light source and described diffusion sheet.
5. module backlight according to claim 1 is characterized in that, the exiting surface of described LGP and/or reflecting surface are waveform configuration.
6. module backlight according to claim 5 is characterized in that, described module backlight is made up of described LGP and described light source, and, the cross section of described waveform configuration be following any one or multiple:
Triangle, circle, ellipse, parabola shaped and hyperbola.
7. module backlight according to claim 5 is characterized in that described waveform configuration is made of prism array.
8. module backlight according to claim 5 is characterized in that, at least one waveform of described waveform configuration is provided with a plurality of bulge-structures and/or sunk structure.
9. module backlight according to claim 8, it is characterized in that, described sunk structure and/or described bulge-structure are circular, near the diameter of the described sunk structure of described light source and/or described bulge-structure less than away from the described depression mechanism of described light source and/or the diameter of described bulge-structure, and, be lower than away from the described depression mechanism of described light source and/or the density of described bulge-structure near the described sunk structure of described light source and/or the density of described bulge-structure.
10. a display device is characterized in that comprising each described module backlight in the claim 1 to 9.
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| CN201110042688.6A CN102095141B (en) | 2011-02-22 | 2011-02-22 | Backlight module and display equipment |
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| CN201110042688.6A CN102095141B (en) | 2011-02-22 | 2011-02-22 | Backlight module and display equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103018952A (en) * | 2012-12-21 | 2013-04-03 | 京东方科技集团股份有限公司 | Display base plate and display device comprising display base plate |
| CN103791323A (en) * | 2013-12-31 | 2014-05-14 | 东莞市亚星半导体有限公司 | Backlight module |
| CN105093392A (en) * | 2015-08-14 | 2015-11-25 | 青岛海信电器股份有限公司 | Light guide plate and liquid crystal display |
| CN114137652A (en) * | 2021-12-07 | 2022-03-04 | 华玻视讯(珠海)科技有限公司 | Novel glass light guide plate |
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| CN1627152A (en) * | 2003-12-11 | 2005-06-15 | 鸿富锦精密工业（深圳）有限公司 | Light guiding plate |
| CN2736798Y (en) * | 2004-09-20 | 2005-10-26 | 清华大学 | Light guide plate and backlight module |
| CN1916722A (en) * | 2005-08-18 | 2007-02-21 | 鸿富锦精密工业（深圳）有限公司 | Plate of guiding light, backlight module, and double-faced liquid crystal display device |
| CN101738673A (en) * | 2008-11-20 | 2010-06-16 | 扬昕精密股份有限公司 | Light guide plate and backlight module |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1627152A (en) * | 2003-12-11 | 2005-06-15 | 鸿富锦精密工业（深圳）有限公司 | Light guiding plate |
| CN2736798Y (en) * | 2004-09-20 | 2005-10-26 | 清华大学 | Light guide plate and backlight module |
| CN1916722A (en) * | 2005-08-18 | 2007-02-21 | 鸿富锦精密工业（深圳）有限公司 | Plate of guiding light, backlight module, and double-faced liquid crystal display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103018952A (en) * | 2012-12-21 | 2013-04-03 | 京东方科技集团股份有限公司 | Display base plate and display device comprising display base plate |
| CN103791323A (en) * | 2013-12-31 | 2014-05-14 | 东莞市亚星半导体有限公司 | Backlight module |
| CN105093392A (en) * | 2015-08-14 | 2015-11-25 | 青岛海信电器股份有限公司 | Light guide plate and liquid crystal display |
| CN114137652A (en) * | 2021-12-07 | 2022-03-04 | 华玻视讯(珠海)科技有限公司 | Novel glass light guide plate |
| CN114137652B (en) * | 2021-12-07 | 2023-11-28 | 华玻视讯(珠海)科技有限公司 | Glass light guide plate |
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| Publication number | Publication date |
|---|---|
| CN102095141B (en) | 2014-03-26 |
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Address after: 266100 Zhuzhou Road, Laoshan District, Shandong, No. 151, No. Patentee after: Hisense Video Technology Co.,Ltd. Address before: 266100 Zhuzhou Road, Laoshan District, Shandong, No. 151, No. Patentee before: HISENSE ELECTRIC Co.,Ltd. |
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