CN202521382U - Light guide plate, backlight module and display device - Google Patents

Light guide plate, backlight module and display device Download PDF

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Publication number
CN202521382U
CN202521382U CN2012200094128U CN201220009412U CN202521382U CN 202521382 U CN202521382 U CN 202521382U CN 2012200094128 U CN2012200094128 U CN 2012200094128U CN 201220009412 U CN201220009412 U CN 201220009412U CN 202521382 U CN202521382 U CN 202521382U
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China
Prior art keywords
micro
structural
lgp
reflectivity
light
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Expired - Lifetime
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CN2012200094128U
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Chinese (zh)
Inventor
文喜平
宋志成
张智睿
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Hisense Visual Technology Co Ltd
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Qingdao Hisense Electronics Co Ltd
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Priority to CN2012200094128U priority Critical patent/CN202521382U/en
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Abstract

The utility model relates to a light guide plate. The light guide plate comprises a bottom surface, a light outgoing surface, a light incoming side and side surfaces, wherein the bottom surface and the light outgoing surface are opposite; the light outgoing surface is respectively connected with the bottom surface and the light outgoing surface; the side surfaces are respectively connected with the bottom surface, the light outgoing surface and the light incoming side; the light incoming side is provided with a plurality of first microstructures and a plurality of second microstructures which are mutually and alternatively arranged; and the reflectivity of the first microstructures to incident lights is larger than that of the second microstructures. The light guide plate has the advantages that since the reflectivity of the first microstructures to the incident lights is larger than that of the second microstructures, more lights enter after being reflected, and the light incoming uniformity of the light guide plate can be effectively improved. The utility model also provides a backlight module and a display device of the light guide plate.

Description

LGP, module backlight and display unit
Technical field
The utility model relates to Display Technique, relates in particular to a kind of LGP, comprises the module backlight and the display unit of said LGP.
Background technology
In recent years, the extensive use that obtains of LCD.Because liquid crystal layer itself is not luminous, therefore in general can use backlight in the LCD.Backlight generally comprises light source and LGP.Light source is arranged on the bottom surface or the side of LGP.That is to say bottom surface or side incident side as LGP.At present, along with the development of technology, light emitting diode spot lights such as (LED) replaces traditional cold-cathode fluorescence lamp gradually and is applied to backlight.
In side incident type LED-backlit module; The LED lamp is attached between printed circuit board (PCB) (PCB) each LED of last time and all has certain distance; So just inevitably can be higher relatively in the local brightness that the LED lamp is arranged, there is not the local brightness of LED lamp a little low relatively.From entire aphototropism mould, in the phenomenon that can show bright dark inequality in vain after the match.Common LGP just the density through network point and size to dwindle relative brightness poor, with realize as far as possible that incident side shows smoothly, but this method depends critically upon the typography of LGP.
To this problem, once proposed to attach the scheme of the material that is similar to prismatic lens in the prior art in the incident side of LGP.Its principle also is to utilize type prism structure to reflection of light, and the brightness that increases dark space between each LED alleviates lamp shadow.But the refractive index of its weak point type of being prism material can not be identical with the refractive index of LGP material; Light can cause the loss of light energy when after through the class prism material, getting into LGP; Simultaneously; Because the coefficient of expansion of material is different, the expansion of LGP is different certainly with the expansion of prism after being heated, and this will cause the stability of a system to reduce.
The utility model content
For addressing the above problem, the purpose of the utility model is to provide a kind of inhomogeneity module backlight of module light inlet backlight and display unit of promoting.
Above-mentioned each purpose of the utility model is to realize through following technical scheme:
A kind of LGP, it comprises opposed bottom surface and exiting surface, the incident side of joining with bottom surface and exiting surface respectively, and the side that joins with bottom surface, exiting surface and incident side respectively; Have a plurality of first micro-structurals and a plurality of second micro-structural on the incident side, first micro-structural and second micro-structural are arranged alternately each other, and first micro-structural to the reflectivity of incident ray greater than said second micro-structural.
Reflectivity through making first micro-structural in the above-mentioned LGP makes more light through reflection back incident greater than the reflectivity of second micro-structural, can effectively promote the optical uniformity of going into of LGP.
Among another embodiment of the utility model, for further being lifted into optical uniformity, the reflectivity ratio of the reflectivity of first micro-structural and second micro-structural is between 1.5 to 3.
Among another embodiment of the utility model, for further being lifted into optical uniformity, first micro-structural and second micro-structural comprise at least one V-shaped groove respectively.
Among another embodiment of the utility model, for further being lifted into optical uniformity, the drift angle of the V-shaped groove of first micro-structural is greater than the drift angle of the V-shaped groove of second micro-structural.
Among another embodiment of the utility model, for further being lifted into optical uniformity, the width ratio of first micro-structural and second micro-structural is between 0.8 to 5.
A kind of module backlight, it comprises LGP and light source assembly.Light source assembly comprises pedestal and establishes a plurality of light sources on the pedestal, and light source and the corresponding one by one setting of first micro-structural.LGP comprises opposed bottom surface and exiting surface, the incident side of joining with bottom surface and exiting surface respectively, and the side that joins with bottom surface, exiting surface and incident side respectively; Have a plurality of first micro-structurals and a plurality of second micro-structural on the incident side, first micro-structural and second micro-structural are arranged alternately each other, and first micro-structural to the reflectivity of incident ray greater than said second micro-structural.
Among another embodiment of the utility model,, has the gap between light source assembly and the incident side for further being lifted into optical uniformity.
Among another embodiment of the utility model, for further being lifted into optical uniformity, above-mentioned gap is an air layer.
Among another embodiment of the utility model, for further being lifted into optical uniformity, the width ratio of the width in gap and first micro-structural is between 0.1 to 0.6.
Among another embodiment of the utility model; For further being lifted into optical uniformity; Said base has a surface, and the surface comprises a plurality of low reflective areas and high reflective areas, and a plurality of low reflective areas separate each other; Each low reflective areas is around a corresponding light source setting, and the reflectivity of high reflective areas is greater than the reflectivity of low reflective areas.
A kind of display unit, it comprises module backlight and display layer.Module backlight comprises LGP and light source assembly.LGP comprises opposed bottom surface and exiting surface, the incident side of joining with bottom surface and exiting surface respectively, and the side that joins with bottom surface, exiting surface and incident side respectively; Have a plurality of first micro-structurals and a plurality of second micro-structural on the incident side, first micro-structural and second micro-structural are arranged alternately each other, and first micro-structural to the reflectivity of incident ray greater than said second micro-structural.Display layer is arranged on the exiting surface of LGP.
In above-mentioned LGP; Because first micro-structural is to the reflectivity of the incident ray reflectivity greater than said second micro-structural; The light at the first micro-structural place is more reflected from second micro-structural entering LGP, the optical uniformity of going into that promotes LGP can be arranged.
And in the module backlight and display unit that adopt above-mentioned LGP; The width in the gap of light source and the LGP incident side of also can further arranging in pairs or groups and the reflectivity of light source assembly base-plates surface zones of different promote from the second micro-structural quantity of incident light, thereby the optical uniformity of going into of LGP further is provided.For let the above-mentioned of the utility model and other purposes, feature and advantage can be more obviously understandable, hereinafter is special lifts preferred embodiment, and cooperates appended graphicly, elaborates as follows.
Description of drawings
The schematic perspective view of the LGP that Fig. 1 provides for the utility model first embodiment.
Fig. 2 is the local enlarged diagram of area I I among Fig. 1.
The local enlarged diagram of the LGP that Fig. 3 provides for the utility model second embodiment.
The local enlarged diagram of the LGP that Fig. 4 provides for the utility model the 3rd embodiment.
The local enlarged diagram of the LGP that Fig. 5 provides for the utility model the 4th embodiment.
The schematic perspective view of the module backlight that Fig. 6 provides for the utility model the 5th embodiment.
Fig. 7 is the light source assembly sketch map of the module backlight of Fig. 6
The schematic perspective view of the display unit that Fig. 8 provides for the utility model the 6th embodiment.
The specific embodiment
For further setting forth the utility model is technological means and the effect that the predetermined utility model purpose of realization is taked; Below in conjunction with accompanying drawing and preferred embodiment; To the specific embodiment, structure, characteristic and the effect thereof of the LGP, module backlight and the display unit that propose according to the utility model, specify as after.
The schematic perspective view of the LGP that Fig. 1 provides for the utility model first embodiment.See also Fig. 1; LGP 100 for example is a rectangular flat; It can be by the transparent material of high transmission rate, refractive index Merlon (Polycarbonate for example; PC), poly-methyl methacrylate acid (Poly (methyl methacrylate), PMMA), polystyrene (Polystyrene, PS) etc. processes.
LGP 100 comprise bottom surface 101, with the relative and parallel exiting surface 102 in bottom surface 101, the incident side 10 of joining with bottom surface 101 and exiting surface 102 respectively, and three sides 104.Wherein two sides 104 join with bottom surface 101, exiting surface 102 and incident side 103 respectively, and the another side is relative with incident side 103.
Incident side 10 has a plurality of first micro-structurals 11 and a plurality of second micro-structurals 12.First micro-structural 11 and second micro-structural 12 are arranged alternately each other, promptly except that with side 103 adjacents, each each micro-structural 11 is between two second adjacent micro-structurals 12, and each second micro-structural 12 is between two first adjacent micro-structurals 11.First micro-structural 11 mainly be used for to the light that light source directly sends reflect, scattering and refraction, and second micro-structural 12 mainly is to be used for non-direct light is carried out scattering and refraction.Above-mentioned non-direct light is meant after light source sends the light that is reflected by first micro-structural 11 or second micro-structural 12.Therefore, when LGP 100 was assembled into module backlight, first micro-structural 11 was over against the light source setting, and second micro-structural, 12 places do not have light source.
The reflectivity of first micro-structural 11 is greater than the reflectivity of second micro-structural 12.For example, the reflectivity ratio of the reflectivity of first micro-structural 11 and second micro-structural 12 can be between 1.5 to 3.This can realize through making first micro-structural 11 and second micro-structural 12 have various structure.
For example, consult Fig. 2, in the present embodiment, first micro-structural 11 and second micro-structural 12 are through V-shaped groove between bottom surface 101 and the exiting surface 102.At this moment, can be through drift angle that changes V-shaped groove and/or the reflectivity that the depth changes first micro-structural 11 and second micro-structural 12.For example, under suitable angle, can make the drift angle of the V-shaped groove in first micro-structural 11 realize the reflectivity of the reflectivity of first micro-structural 11 greater than second micro-structural 12 greater than the drift angle of the V-shaped groove in second micro-structural 12.
Be appreciated that; Though each first micro-structural 11 and second micro-structural 12 only comprise a V-shaped groove in Fig. 2; But the quantity of V-shaped groove is in fact also unrestricted in first micro-structural 11 and second micro-structural 12; As long as process conditions can reach, can form the littler secondary micro-structural of any amount.With present process conditions, the width of V-shaped groove can 200 microns and below, and minimum-depth is about 70 microns, the drift angle of V-shaped groove then can 0 be spent between 180 degree.
Consult Fig. 3, it is first micro-structural and the local enlarged diagram of second micro-structural among second embodiment.In the present embodiment, the second micro-structural 12a is identical with second micro-structural 12 among first embodiment.Yet the first micro-structural 11a comprises a plurality of grooves that are arranged side by side or protruding 112.The degree of depth of the groove of the first micro-structural 11a or convexity 112 is shallow than the V-shaped groove of the second micro-structural 12a.Many groove structures of the first micro-structural 11a are beneficial to and make light generation scattering and refraction in a subtle way, and the dark V-shaped groove of the second micro-structural 12a is beneficial to light LGP in a subtle way.
Consult Fig. 4, it is first micro-structural and the local enlarged diagram of second micro-structural among the 3rd embodiment.In the present embodiment, the first micro-structural 11b be with second embodiment in the first micro-structural 11a keep identical, yet the second micro-structural 12b arc-shaped groove.Than V-shaped groove, arc-shaped groove can further be avoided causing bright spot in the edges and corners of V-shaped groove.
Consult Fig. 5, it is first micro-structural and the local enlarged diagram of second micro-structural among the 4th embodiment.In the present embodiment, the second micro-structural 12c is identical with the second micro-structural 12b among the 3rd embodiment.Yet the first micro-structural 11c comprises a plurality of sites 114.Site 114 for example can be tapered, circular arc or rectangle.In the present embodiment, site 114 is tapered.
The concrete structure that is appreciated that first micro-structural and second micro-structural is not limited to the mode that above embodiment describes, as long as it can satisfy the reflectivity of the reflectivity of first micro-structural greater than second micro-structural.In the LGP of the foregoing description, can remember that the luminous flux that light source sends is Φ, when supposing that reflectivity in first micro-structural and second micro-structural is identical, the luminous flux of first micro-structural is Φ A, the luminous flux of second micro-structural is Φ B, Φ=Φ then A+ Φ B, the luminous flux contrast that this moment, we can obtain two zones is: And under the practical situation, because the reflectivity of first micro-structural, has more light greater than the reflectivity of second micro-structural and is reflected and gets into gap area from the first slight structure, the luminous flux of supposing this part is Φ ', and then the luminous flux of first micro-structural can become Φ A-Φ ', and the luminous flux of second micro-structural can become Φ B+ Φ ', promptly the luminous flux at the first micro-structural place can reduce, and the luminous flux at the second micro-structural place can increase.This moment two zones the luminous flux contrast can become clearly this just explanation through the size of adjustment reflectivity; The brightness contrast of first micro-structural and second micro-structural is reduced, and it is more level and smooth that the luminance transition between it can show.
Be appreciated that the width between first micro-structural 11 and second micro-structural 12 can influence the optical uniformity of going into of LGP 100 equally except the reflectivity of the reflectivity of first micro-structural 11 and second micro-structural 12.In the present embodiment, the width ratio of first micro-structural 11 and second micro-structural 12 can be between 0.8 to 5.Through the comprehensive setting of first micro-structural 11 and second micro-structural, 12 width, reflectivity, can further promote present embodiment LGP 100 go into optical uniformity, reduce the generation of clear zone and dark space, and can reduce the usage quantity of light source.
The schematic perspective view of the module backlight 200 of the employing LGP 100 that Fig. 6 provides for the utility model the 5th embodiment.See also Fig. 6, module 200 backlight comprises LGP 100 and is arranged on the light source assembly 20 of LGP 100 incident side 10.
Light source assembly 20 comprises pedestal 21 and a plurality of spot light 22 that is arranged on the pedestal 21.Pedestal 21 is a printed circuit board (PCB) for example, and spot light 22 for example is a LED source.
See also Fig. 7, spot light 22 is evenly distributed on the surface 210 of pedestal 21.As shown in Figure 6, surface 210 is 1 surface in the face of incident side 10.Have a plurality of low reflective areas 212 in the surface 210.Each low reflective areas 212 is provided with around a corresponding spot light 22, and is spaced from each other between each low reflective areas 212.The surface of low reflective areas 212 can be matsurface diffuse surface in other words.And the part of surface 210 except low reflective areas 212 is high reflective areas 214, can form high refractive index layer on it.The reflectivity of high reflective areas 214 is greater than low reflective areas 212.
Each spot light 22 and corresponding low reflective areas are provided with over against first micro-structural 11 of a correspondence.And light source assembly 20 is the high reflective areas 214 on surface 210 over against the position of second micro-structural 12.
Has gap 23 between light source assembly 20 and the incident side 10.The width W in gap 3 (directions X) can be between 20 microns to 120 microns.More specifically, the ratio of W and W1 can be between 0.1 to 0.6, in this seed ginseng said conditions following time, can make more light got into the zone of second micro-structural 12 by first micro-structural, 11 reflection backs.Be not filled with other media in the gap 23, that is to say, gap 23 is actually air layer or vacuum layer.Therefore, the light loss consumption when light is reflected through 23 inside, gap is very low.
In the module backlight 200 of present embodiment,, therefore have the excellent optical uniformity of going into, and the ratio of the width W through the gap is set and the width W 1 of first micro-structural 11 can further be lifted into optical uniformity owing to adopted LGP 100.
In addition; Owing on surface 210, form low reflective areas 212 and high reflective areas 214 respectively to first micro-structural 11 and second micro-structural 12 at pedestal 21; Therefore can further reduce the light that reflexes to first micro-structural, 11 places; Make more rays reflex to second micro-structural, 12 places, thereby the optical uniformity of going into of module 200 backlight further is provided.
Please refer to Fig. 8, the structural representation of the display unit 300 that it provides for the utility model the 6th embodiment.Display unit 300 comprises module backlight 200, reflecting plate 30, and display layer 40.Reflecting plate 30 by the material of high reflectance for example aluminium form, certainly, reflecting plate 30 also can be replaced by the reflectance coating on the bottom surface 101 of the LGP that is formed directly into module 100 backlight 10.Display layer 40 for example needs to rely on the display layer that backlight shows arbitrarily for display panels or electrophoresis showed layer etc.
Based on the above-mentioned advantage of module 200 backlight, the display unit 300 of present embodiment has the excellent optical uniformity of going into.
The above; It only is the preferred embodiment of the utility model; Not being that the utility model is done any pro forma restriction, though the utility model with the preferred embodiment announcement as above, yet is not in order to limit the utility model; Any those skilled in the art; In not breaking away from the utility model technical scheme scope, make a little change or be modified to the equivalent embodiment of equivalent variations when the technology contents of above-mentioned announcement capable of using, be not break away from the utility model technical scheme content in every case;, all still belong in the scope of the utility model technical scheme any brief introduction modification, equivalent variations and modification that above embodiment did according to the technical spirit of the utility model.

Claims (11)

1. LGP, it comprises opposed bottom surface and exiting surface, the incident side of joining with said bottom surface and said exiting surface respectively, and the side that joins with said bottom surface, said exiting surface and said incident side respectively;
It is characterized in that; Have a plurality of first micro-structurals and a plurality of second micro-structural on the said incident side; Said a plurality of first micro-structural and said a plurality of second micro-structural are arranged alternately each other, and said first micro-structural to the reflectivity of incident ray greater than said second micro-structural.
2. LGP as claimed in claim 1 is characterized in that, the reflectivity ratio of the reflectivity of said first micro-structural and second micro-structural is between 1.5 to 3.
3. LGP as claimed in claim 2 is characterized in that, said first micro-structural and said second micro-structural comprise at least one V-shaped groove respectively.
4. LGP as claimed in claim 3 is characterized in that the drift angle of the V-shaped groove of first micro-structural is greater than the drift angle of the V-shaped groove of said second micro-structural.
5. LGP as claimed in claim 1 is characterized in that, the width ratio of said first micro-structural and said second micro-structural is between 0.8 to 5.
6. module backlight, it comprises LGP and light source assembly; It is characterized in that,
Said LGP is each described LGP of claim 1-5, and said light source assembly comprises pedestal and is arranged at a plurality of light sources on the said pedestal, said a plurality of light sources and the corresponding one by one setting of said a plurality of first micro-structurals.
7. module backlight as claimed in claim 6 is characterized in that, has the gap between said light source assembly and the said incident side.
8. module backlight as claimed in claim 7 is characterized in that, said gap is an air layer.
9. module backlight as claimed in claim 7 is characterized in that, the width ratio of the width in said gap and said first micro-structural is between 0.1 to 0.6.
10. module backlight as claimed in claim 6; It is characterized in that; Said pedestal has a surface, and said surface comprises a plurality of low reflective areas and high reflective areas, and said a plurality of low reflective areas separate each other; Each low reflective areas is around a corresponding light source setting, and the reflectivity of said high reflective areas is greater than the reflectivity of said low reflective areas.
11. a display unit, it comprises module backlight and display layer; It is characterized in that,
Said module backlight is the described module backlight of claim 6, and said display layer is arranged on the said exiting surface of said LGP.
CN2012200094128U 2012-01-10 2012-01-10 Light guide plate, backlight module and display device Expired - Lifetime CN202521382U (en)

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Application Number Priority Date Filing Date Title
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102563466A (en) * 2012-01-10 2012-07-11 青岛海信电器股份有限公司 Backlight module and display device
CN103543558A (en) * 2013-10-30 2014-01-29 桂林福冈新材料有限公司 Method for removing backlight hot spot phenomenon of LED (Light Emitting Diode)
CN103926645A (en) * 2013-04-22 2014-07-16 上海天马微电子有限公司 Light guiding plate, backlight module and display device
CN104373863A (en) * 2013-08-14 2015-02-25 鸿富锦精密工业(深圳)有限公司 Backlight module and display device with same

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102563466A (en) * 2012-01-10 2012-07-11 青岛海信电器股份有限公司 Backlight module and display device
CN103926645A (en) * 2013-04-22 2014-07-16 上海天马微电子有限公司 Light guiding plate, backlight module and display device
CN104373863A (en) * 2013-08-14 2015-02-25 鸿富锦精密工业(深圳)有限公司 Backlight module and display device with same
CN103543558A (en) * 2013-10-30 2014-01-29 桂林福冈新材料有限公司 Method for removing backlight hot spot phenomenon of LED (Light Emitting Diode)

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CP01 Change in the name or title of a patent holder

Address after: 266555 Qingdao economic and Technological Development Zone, Shandong, Hong Kong Road, No. 218

Patentee after: Hisense Video Technology Co.,Ltd.

Address before: 266555 Qingdao economic and Technological Development Zone, Shandong, Hong Kong Road, No. 218

Patentee before: HISENSE ELECTRIC Co.,Ltd.

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Granted publication date: 20121107

CX01 Expiry of patent term