CN102563466B - Backlight module and display device - Google Patents
Backlight module and display device Download PDFInfo
- Publication number
- CN102563466B CN102563466B CN201210006002.2A CN201210006002A CN102563466B CN 102563466 B CN102563466 B CN 102563466B CN 201210006002 A CN201210006002 A CN 201210006002A CN 102563466 B CN102563466 B CN 102563466B
- Authority
- CN
- China
- Prior art keywords
- microstructure
- guide plate
- light guide
- light
- backlight module
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Abstract
The invention relates to a light guide plate, which comprises a bottom surface, a light emergent surface, a light incident side and side surfaces. The bottom surface is opposite to the light emergent surface, the light incident side is respectively connected with the bottom surface and the light emergent surface, the side surfaces are respectively connected with the bottom surface, the light emergent surface and the light incident side, a plurality of first microstructures and a plurality of second microstructures are disposed on the light incident side and are arranged alternately mutually, and reflectivity of each first microstructure to incident light rays is higher than that of each second microstructure to the incident light rays. As the reflectivity of each first microstructure is higher than that of each second microstructure in the light guide plate, more light rays can be incident after being reflected, and incident light uniformity of the light guide plate can be effectively improved. The invention further provides a backlight module comprising the light guide plate and a display device comprising the light guide plate.
Description
Technical field
The present invention relates to display technique, particularly relate to a kind of light guide plate, comprise backlight module and the display device of described light guide plate.
Background technology
In recent years, the widespread use that obtains of liquid crystal display.Because liquid crystal layer itself is not luminous, therefore in general backlight can be used in liquid crystal display.Backlight generally comprises light source and light guide plate.Light source is arranged on bottom surface or the side of light guide plate.That is bottom surface or side are as the incident side of light guide plate.At present, along with the development of technology, the pointolites such as light emitting diode (LED) replace traditional cold-cathode fluorescence lamp gradually and are applied to backlight.
In the incident type LED-backlit module of side, certain distance is all there is between each LED when LED is attached on printed circuit board (PCB) (PCB), so just inevitably there iing the local brightness of LED relatively higher, do not having the local brightness of LED relatively lower.From whole backlight module, the phenomenon of bright dark inequality can shown in vain after the match.Common light guide plate just reduces relative brightness difference by the density of network point and size, and to realize the level and smooth of incident side display as far as possible, but this method depends critically upon the typography of light guide plate.
For this problem, once proposed in prior art to attach in the incident side of light guide plate the scheme being similar to the material of prismatic lens.Its principle is also utilize class prism structure to the reflection of light, increases the brightness of dark space between each LED to alleviate lamp shadow.But its weak point is that the refractive index of class prism material can not be identical with the refractive index of light guide panel material, light can cause the loss of luminous energy when entering light guide plate after by class prism material, simultaneously, because the expansion coefficient of material is different after being heated, the expansion of light guide plate is certainly different from the expansion of prism, and this will cause system stability to reduce.
Summary of the invention
For solving the problem, the object of the present invention is to provide and a kind ofly promote backlight module and the display device that backlight module enters optical uniformity.
The above-mentioned each object of the present invention is realized by following technical scheme:
A kind of light guide plate, it comprises relative bottom surface and exiting surface, the incident side connected with bottom surface and exiting surface respectively, and the side connected with bottom surface, exiting surface and incident side respectively; Incident side has multiple first microstructure and multiple second microstructure, the first microstructure and the second microstructure are arranged alternately mutually, and the reflectivity of the first microstructure to incident ray is greater than described second microstructure.
Reflectivity by making the reflectivity of the first microstructure be greater than the second microstructure in above-mentioned light guide plate makes more light incident after reflection, and what effectively can promote light guide plate enters optical uniformity.
In another embodiment of the present invention, for being lifted into optical uniformity further, the reflectivity of the first microstructure and the reflectivity ratio of the second microstructure are between 1.5 to 3.
In another embodiment of the present invention, for being lifted into optical uniformity further, the first microstructure and the second microstructure comprise at least one V-shaped groove respectively.
In another embodiment of the present invention, for being lifted into optical uniformity further, the drift angle of the V-shaped groove of the first microstructure is greater than the drift angle of the V-shaped groove of the second microstructure.
In another embodiment of the present invention, for being lifted into optical uniformity further, the width ratio of the first microstructure and the second microstructure is between 0.8 to 5.
A kind of backlight module, it comprises light guide plate and light source assembly.Light source assembly comprises pedestal and establishes the multiple light sources on pedestal, and light source and the first microstructure one_to_one corresponding are arranged.Light guide plate comprises relative bottom surface and exiting surface, the incident side connected with bottom surface and exiting surface respectively, and the side connected with bottom surface, exiting surface and incident side respectively; Incident side has multiple first microstructure and multiple second microstructure, the first microstructure and the second microstructure are arranged alternately mutually, and the reflectivity of the first microstructure to incident ray is greater than described second microstructure.
In another embodiment of the present invention, for being lifted into optical uniformity further, between light source assembly and incident side, there is gap.
In another embodiment of the present invention, for being lifted into optical uniformity further, above-mentioned gap is air layer.
In another embodiment of the present invention, for being lifted into optical uniformity further, the width in gap and the width ratio of the first microstructure are between 0.1 to 0.6.
In another embodiment of the present invention, for being lifted into optical uniformity further, said base has a surface, surface comprises multiple low reflective areas and high reflective areas, multiple low reflective areas separates each other, each low reflective areas is arranged around a corresponding light source, and the reflectivity of high reflective areas is greater than the reflectivity of low reflective areas.
A kind of display device, it comprises backlight module and display layer.Backlight module comprises light guide plate and light source assembly.Light guide plate comprises relative bottom surface and exiting surface, the incident side connected with bottom surface and exiting surface respectively, and the side connected with bottom surface, exiting surface and incident side respectively; Incident side has multiple first microstructure and multiple second microstructure, the first microstructure and the second microstructure are arranged alternately mutually, and the reflectivity of the first microstructure to incident ray is greater than described second microstructure.Display layer is arranged on the exiting surface of light guide plate.
In above-mentioned light guide plate, because the reflectivity of the first microstructure to incident ray is greater than the reflectivity of described second microstructure, the light at the first microstructure place can be made more to reflect and enter light guide plate from the second microstructure, what can have lifting light guide plate enters optical uniformity.
And in the backlight module adopting above-mentioned light guide plate and display device, the width in the gap of light source and the light guide plate incident side of also can arranging in pairs or groups further and the reflectivity of light source assembly base-plates surface zones of different promote the light quantity from the second microstructure incidence, thus light guide plate is provided further enter optical uniformity.For above and other object of the present invention, feature and advantage can be become apparent, preferred embodiment cited below particularly, and coordinate institute's accompanying drawings, be described in detail below.
Accompanying drawing explanation
The schematic perspective view of the light guide plate that Fig. 1 provides for first embodiment of the invention.
Fig. 2 is the close-up schematic view of region II in Fig. 1.
The close-up schematic view of the light guide plate that Fig. 3 provides for second embodiment of the invention.
The close-up schematic view of the light guide plate that Fig. 4 provides for third embodiment of the invention.
The close-up schematic view of the light guide plate that Fig. 5 provides for fourth embodiment of the invention.
The schematic perspective view of the backlight module that Fig. 6 provides for fifth embodiment of the invention.
Fig. 7 is the light source assembly schematic diagram of the backlight module of Fig. 6
The schematic perspective view of the display device that Fig. 8 provides for sixth embodiment of the invention.
Embodiment
For further setting forth the present invention for the technological means that realizes predetermined goal of the invention and take and effect, below in conjunction with accompanying drawing and preferred embodiment, to the embodiment of the light guide plate proposed according to the present invention, backlight module and display device, structure, feature and effect thereof, be described in detail as follows.
The schematic perspective view of the light guide plate that Fig. 1 provides for first embodiment of the invention.Refer to Fig. 1, light guide plate 100 is such as rectangular flat, it can by the transparent material of high transmission rate, refractive index such as polycarbonate (Polycarbonate, PC), poly-methyl methacrylate acid (Poly (methylmethacrylate), PMMA), polystyrene (Polystyrene, PS) etc. are made.
Light guide plate 100 comprises bottom surface 101, the exiting surface 102 relative and parallel with bottom surface 101, the incident side 10 connected with bottom surface 101 and exiting surface 102 respectively and three sides 104.Wherein two sides 104 connect with bottom surface 101, exiting surface 102 and incident side 103 respectively, and another side is relative with incident side 103.
Incident side 10 has multiple first microstructures 11 and multiple second microstructure 12.First microstructure 11 and the second microstructure 12 are arranged alternately mutually, and namely except with except the adjacent of side 103, each microstructure 11 each is between two adjacent the second microstructures 12, and each second microstructure 12 is between two adjacent the first microstructures 11.First microstructure 11 is mainly used for reflecting the light that light source directly sends, scattering and refraction, and the second microstructure 12 is mainly used for carrying out scattering and refraction to non-immediate light.Above-mentioned non-immediate light refers to after light source sends by light that the first microstructure 11 or the second microstructure 12 reflect.Therefore, when light guide plate 100 is assembled into backlight module, the first microstructure 11 is just arranging light source, and the second microstructure 12 place does not have light source.
The reflectivity of the first microstructure 11 is greater than the reflectivity of the second microstructure 12.Such as, the reflectivity of the first microstructure 11 and the reflectivity ratio of the second microstructure 12 can between 1.5 to 3.This realizes by making the first microstructure 11 have different structures from the second microstructure 12.
Such as, consult Fig. 2, in the present embodiment, the first microstructure 11 and the second microstructure 12 are through V-shaped groove between bottom surface 101 and exiting surface 102.Now, the reflectivity of the first microstructure 11 and the second microstructure 12 can be changed by the drift angle and/or the depth changing V-shaped groove.Such as, under suitable angle, the reflectivity that the drift angle of the V-shaped groove that the drift angle of the V-shaped groove in the first microstructure 11 can be made to be greater than in the second microstructure 12 realizes the first microstructure 11 is greater than the reflectivity of the second microstructure 12.
Be appreciated that, although each first microstructure 11 and the second microstructure 12 only comprise a V-shaped groove in fig. 2, but the quantity of V-shaped groove in fact and unrestricted in the first microstructure 11 and the second microstructure 12, as long as process conditions can reach, the less secondary microstructure of any amount can be formed.With current process conditions, the width of V-shaped groove can at 200 microns and following, and minimum-depth is at 70 microns, and the drift angle of V-shaped groove then can between 0 degree to 180 degree.
Consult Fig. 3, it is the close-up schematic view of the first microstructure in the second embodiment and the second microstructure.In the present embodiment, the second microstructure 12a is identical with the second microstructure 12 in the first embodiment.But the first microstructure 11a comprises multiple groove or protruding 112 be arranged side by side.The groove of the first microstructure 11a or protruding 112 the degree of depth shallow compared with the V-shaped groove of the second microstructure 12a.Many groove structures of the first microstructure 11a are beneficial to and make light generation scattering and refraction in a subtle way, and the dark V-shaped groove of the second microstructure 12a is beneficial to light light guide plate in a subtle way.
Consult Fig. 4, it is the close-up schematic view of the first microstructure in the 3rd embodiment and the second microstructure.In the present embodiment, the first microstructure 11b keeps identical with the first microstructure 11a in the second embodiment, but the second microstructure 12b arc-shaped groove.Compared to V-shaped groove, arc-shaped groove can be avoided causing bright spot in the edges and corners of V-shaped groove further.
Consult Fig. 5, it is the close-up schematic view of the first microstructure in the 4th embodiment and the second microstructure.In the present embodiment, the second microstructure 12c is identical with the second microstructure 12b in the 3rd embodiment.But the first microstructure 11c comprises multiple site 114.Site 114 such as can tapered, circular arc or rectangle.In the present embodiment, site 114 is tapered.
Be appreciated that the mode that the concrete structure of the first microstructure and the second microstructure is not limited to above embodiment and describes, as long as its reflectivity that can meet the first microstructure is greater than the reflectivity of the second microstructure.In the light guide plate of above-described embodiment, can remember that the luminous flux that light source sends is Φ, suppose when the first microstructure is identical with the reflectivity of the second microstructure, the luminous flux of the first microstructure is Φ
a, the luminous flux of the second microstructure is Φ
b, then Φ=Φ
a+ Φ
b, the luminous flux contrast that now we can obtain two regions is:
and under practical situation, the reflectivity due to the first microstructure is greater than the reflectivity of the second microstructure, have more light and entered gap area from the first slight structure by reflecting, suppose that the luminous flux of this part is Φ ', then the luminous flux of the first microstructure can become Φ
a-Φ ', and the luminous flux of the second microstructure can become Φ
b+ Φ ', namely the luminous flux at the first microstructure place can reduce, and the luminous flux at the second microstructure place can increase.The now luminous flux contrast in two regions can become
clearly
this just illustrates the size by adjusting reflectivity, and the brightness contrast of the first microstructure and the second microstructure can be made to reduce, and it is more level and smooth that the luminance transition between it can show.
Be appreciated that except the reflectivity of the first microstructure 11 and the reflectivity of the second microstructure 12, the width between the first microstructure 11 with the second microstructure 12 is same can affect light guide plate 100 enter optical uniformity.In the present embodiment, the width ratio of the first microstructure 11 and the second microstructure 12 can between 0.8 to 5.By the comprehensive setting of the first microstructure 11 and the second microstructure 12 width, reflectivity, what can promote the light guide plate 100 of the present embodiment further enters optical uniformity, reduces the generation of clear zone and dark space, and can reduce the usage quantity of light source.
The schematic perspective view of the backlight module 200 of the employing light guide plate 100 that Fig. 6 provides for fifth embodiment of the invention.Refer to Fig. 6, backlight module 200 comprises light guide plate 100 and is arranged on the light source assembly 20 of light guide plate 100 incident side 10.
Light source assembly 20 comprises pedestal 21 and multiple pointolite 22 be arranged on pedestal 21.Pedestal 21 is such as printed circuit board (PCB), and pointolite 22 is such as LED source.
Refer to Fig. 7, pointolite 22 is evenly distributed on the surface 210 of pedestal 21.As shown in Figure 6, surface 210 is the surface of incident side 10 faced by 1.In surface 210, there is multiple low reflective areas 212.Each low reflective areas 212 is arranged around a corresponding pointolite 22, and is spaced from each other between each low reflective areas 212.The surface of low reflective areas 212 can be uneven surface diffuse surface in other words.And the part of surface 210 except low reflective areas 212 is high reflective areas 214, it can form high refractive index layer.The reflectivity of high reflective areas 214 is greater than low reflective areas 212.
Each pointolite 22 and corresponding low reflective areas are just arranged corresponding first microstructure 11.And light source assembly 20 is being just the high reflective areas 214 on surface 210 to the position of the second microstructure 12.
There is between light source assembly 20 and incident side 10 gap 23.The width W (X-direction) in gap 3 can between 20 microns to 120 microns.More specifically, the ratio of W and W1 between 0.1 to 0.6, time under this kind of Parameter Conditions, can enter the region of the second microstructure 12 after more light can be made to be reflected by the first microstructure 11.Be not filled with other media in gap 23, that is, gap 23 is actually air layer or vacuum layer.Therefore, the light loss when light is reflected inner through gap 23 is very low.
In the backlight module 200 of the present embodiment, owing to have employed light guide plate 100, therefore have and excellent enter optical uniformity, and, by the ratio of the width W 1 of the width W and the first microstructure 11 that arrange gap, optical uniformity can be lifted into further.
In addition, owing to forming low reflective areas 212 and high reflective areas 214 respectively for the first microstructure 11 and the second microstructure 12 on the surface 210 of pedestal 21, therefore the light reflexing to the first microstructure 11 place can be reduced further, make more light reflection to the second microstructure 12 place, thus backlight module 200 is provided further enter optical uniformity.
Please refer to Fig. 8, the structural representation of its display device 300 provided for sixth embodiment of the invention.Display device 300 comprises backlight module 200, reflecting plate 30 and display layer 40.Reflecting plate 30 is formed by the material such as aluminium of high reflectance, certainly, reflecting plate 30 also can by be formed directly into backlight module 100 light guide plate 10 bottom surface 101 on reflectance coating replace.Display layer 40 is such as display panels or electrophoretic display layer etc. need arbitrarily dependence backlight to carry out the display layer shown.
Based on the above-mentioned advantage of backlight module 200, the display device 300 of the present embodiment has and excellent enters optical uniformity.
The above, it is only preferred embodiment of the present invention, not any pro forma restriction is done to the present invention, although the present invention discloses as above with preferred embodiment, but and be not used to limit the present invention, any those skilled in the art, do not departing within the scope of technical solution of the present invention, make a little change when the technology contents of above-mentioned announcement can be utilized or be modified to the Equivalent embodiments of equivalent variations, in every case be do not depart from technical solution of the present invention content, according to any brief introduction amendment that technical spirit of the present invention is done above embodiment, equivalent variations and modification, all still belong in the scope of technical solution of the present invention.
Claims (10)
1. a light guide plate, it comprises relative bottom surface and exiting surface, the incident side connected with described bottom surface and described exiting surface respectively, and the side connected with described bottom surface, described exiting surface and described incident side respectively;
It is characterized in that, described incident side have multiple first microstructure and multiple second microstructure, described multiple first microstructure and described multiple second microstructure are arranged alternately mutually, and the reflectivity of described first microstructure to incident ray is greater than described second microstructure to the reflectivity of incident ray, and described first microstructure is just arranging light source, the second microstructure place does not have light source; The reflectivity of described first microstructure and the reflectivity ratio of the second microstructure are between 1.5 to 3.
2. light guide plate as claimed in claim 1, it is characterized in that, described first microstructure and described second microstructure comprise at least one V-shaped groove respectively.
3. light guide plate as claimed in claim 2, it is characterized in that, the drift angle of the V-shaped groove of the first microstructure is greater than the drift angle of the V-shaped groove of described second microstructure.
4. light guide plate as claimed in claim 1, it is characterized in that, the width ratio of described first microstructure and described second microstructure is between 0.8 to 5.
5. a backlight module, it comprises light guide plate and light source assembly; It is characterized in that,
Described light guide plate is the light guide plate described in any one of claim 1-4, and described light source assembly comprises pedestal and is arranged at the multiple light sources on described pedestal, and described multiple light source and described multiple first microstructure one_to_one corresponding are arranged.
6. backlight module as claimed in claim 5, is characterized in that having gap between described light source assembly and described incident side.
7. backlight module as claimed in claim 6, it is characterized in that, described gap is air layer.
8. backlight module as claimed in claim 6, it is characterized in that, the width in described gap and the width ratio of described first microstructure are between 0.1 to 0.6.
9. backlight module as claimed in claim 5, it is characterized in that, described pedestal has a surface, described surface comprises multiple low reflective areas and high reflective areas, described multiple low reflective areas separates each other, each low reflective areas is arranged around a corresponding light source, and the reflectivity of described high reflective areas is greater than the reflectivity of described low reflective areas.
10. a display device, it comprises backlight module and display layer; It is characterized in that,
Described backlight module is backlight module according to claim 5, and described display layer is arranged on the described exiting surface of described light guide plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210006002.2A CN102563466B (en) | 2012-01-10 | 2012-01-10 | Backlight module and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210006002.2A CN102563466B (en) | 2012-01-10 | 2012-01-10 | Backlight module and display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102563466A CN102563466A (en) | 2012-07-11 |
| CN102563466B true CN102563466B (en) | 2015-04-01 |
Family
ID=46409638
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210006002.2A Active CN102563466B (en) | 2012-01-10 | 2012-01-10 | Backlight module and display device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102563466B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103032773B (en) * | 2012-12-26 | 2015-06-03 | 广州大学 | LED (Light-Emitting Diode) backlight module based on liquid crystal display television |
| CN104849793A (en) | 2014-02-19 | 2015-08-19 | 广州奥翼电子科技有限公司 | Electronic paper display screen light-guiding plate and electronic paper display screen |
| CN109407403B (en) * | 2018-12-19 | 2021-07-16 | 厦门天马微电子有限公司 | Backlight module and display device |
| CN111722433A (en) * | 2019-03-22 | 2020-09-29 | 中强光电股份有限公司 | Light source module and display device |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4247035B2 (en) * | 2003-04-21 | 2009-04-02 | シチズン電子株式会社 | Planar light source |
| TWI302221B (en) * | 2006-09-08 | 2008-10-21 | Innolux Display Corp | Liquid crystal display device |
| CN201035177Y (en) * | 2007-01-19 | 2008-03-12 | 台湾奈普光电科技股份有限公司 | Improved structure of light conducting plate |
| TWI378297B (en) * | 2008-04-03 | 2012-12-01 | Chimei Innolux Corp | Backlight module and liquid crystal display using the same |
| CN102128418B (en) * | 2010-01-15 | 2013-01-02 | 群康科技(深圳)有限公司 | Backlight module and liquid crystal display device |
| CN102192450B (en) * | 2011-05-31 | 2014-04-09 | 中航华东光电有限公司 | Backlight module and liquid crystal display device |
| CN202521382U (en) * | 2012-01-10 | 2012-11-07 | 青岛海信电器股份有限公司 | Light guide plate, backlight module and display device |
-
2012
- 2012-01-10 CN CN201210006002.2A patent/CN102563466B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN102563466A (en) | 2012-07-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100370329C (en) | Light conducting plate and back light module | |
| CN100445827C (en) | Light-conducting board and backlight mould set | |
| CN101630037B (en) | Backlight module and light guide plate thereof | |
| CN2862089Y (en) | Light conducting board and back light module unit | |
| US8287172B2 (en) | Planar illumination device | |
| CN101344609B (en) | Back light module and optical plate | |
| CN102287679A (en) | Light source module and backlight module | |
| US20070139968A1 (en) | Light guide plate and backlight module using the same | |
| US9128220B2 (en) | Light guide body with continuously variable refractive index, and devices using such body | |
| KR102266737B1 (en) | lens,light emitting apparatus including the lens, and backlight unit including the apparatus | |
| CN111727403B (en) | Direct type backlight source, manufacturing method thereof and display device | |
| CN101418930B (en) | Area source device for LED | |
| JP4755165B2 (en) | Backlight module | |
| CN102563466B (en) | Backlight module and display device | |
| CN102207565B (en) | Multifunctional optical sheet, and backlight module and liquid crystal display device with optical sheet | |
| CN102279436B (en) | Backlight module and display device | |
| CN101295103B (en) | Back light module and optical plate | |
| US20140211483A1 (en) | Optical sheet | |
| CN202521382U (en) | Light guide plate, backlight module and display device | |
| CN202141827U (en) | Light guide plate, scanning backlight module and LCD | |
| CN102313208A (en) | Backlight module group | |
| CN102878525A (en) | Prism film, side-light type backlight module and liquid crystal display device | |
| CN104216041B (en) | Light guide plate with fillet polygon pattern and the liquid crystal display device with it | |
| CN103399371B (en) | Light guide plate, backlight module and liquid crystal indicator | |
| US20100008062A1 (en) | Optical plate and backlight module using the same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
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. |
|
| CP01 | Change in the name or title of a patent holder |