CN204534282U - The liquid crystal display backlight module of rising angle can be reduced - Google Patents
The liquid crystal display backlight module of rising angle can be reduced Download PDFInfo
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- CN204534282U CN204534282U CN201520086578.3U CN201520086578U CN204534282U CN 204534282 U CN204534282 U CN 204534282U CN 201520086578 U CN201520086578 U CN 201520086578U CN 204534282 U CN204534282 U CN 204534282U
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- Prior art keywords
- light guide
- guide plate
- liquid crystal
- crystal display
- angle
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 22
- 230000000630 rising effect Effects 0.000 title claims abstract description 17
- 230000000737 periodic effect Effects 0.000 claims abstract description 7
- 238000005282 brightening Methods 0.000 claims description 15
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 8
- 229910052782 aluminium Inorganic materials 0.000 claims description 8
- 238000009792 diffusion process Methods 0.000 claims description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000000007 visual effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 9
- 230000003287 optical effect Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 239000012141 concentrate Substances 0.000 description 3
- 238000007598 dipping method Methods 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Abstract
The utility model belongs to technical field of liquid crystal display, disclose a kind of liquid crystal display backlight module that can reduce rising angle, use angle controls light guide plate module and LED light source module, and two pieces of light guide plates post triangular prism array and the lens arra of periodic arrangement respectively.The beneficial effects of the utility model are the rising angles that effectively can reduce liquid crystal display, are applicable to the occasion observation visual angle of liquid crystal display being had to particular/special requirement, as aircraft cockpit etc., have good transplantability and practicality.
Description
Technical field
The utility model and technical field of liquid crystal display, especially a kind of backlight module that can reduce rising angle.
Background technology
Have certain progress, nineteen nineties to lcd technology research both at home and abroad at present, along with popularizing of notebook computer, lcd technology starts develop rapidly.
But the rising angle of existing liquid crystal display is all very large.In the application scenario that some are special, as in the driving cabin of aircraft, if liquid crystal display rising angle is too large, then not only consume energy, and the reverberation shone in neighbouring instrument can interfere with the sight line of pilot, particularly during nighttime driving, can bring certain operation easier and potential danger, the lighting angle therefore accurately controlling liquid crystal display is very necessary.The rising angle of liquid crystal display is mainly determined by the rising angle of backlight module, and the rising angle therefore reducing backlight module is very important.
Summary of the invention
In order to solve the problem, the utility model discloses a kind of liquid crystal display backlight module that can reduce rising angle, the utility model solve the problem adopt technical scheme be: comprise Angle ambiguity light guide plate module and LED light source module, setting light guide plate is outer surface near the side of liquid crystal layer, side on the other side is inner surface, and Angle ambiguity light guide plate module comprises light guide plate one and light guide plate two; The outer surface of described light guide plate one posts triangular prism array; The inner surface of described light guide plate two posts brightening piece, and outer surface is embedded with lens arra; The small triangular prism of periodic arrangement that what described triangular prism array adopted is, Rhizoma Sparganii column length rib is parallel to each other and is parallel to light guide plate border, and the leg-of-mutton base angle, main cross section of triangular prism is asymmetric; Described brightening piece adopts the brightening piece of BEF series; The small elliptical lenses unit of periodic arrangement that what described lens arra adopted is, oval major axis is 0.2mm, and minor axis is 0.1mm, and major axis is parallel to each other and spacing is 0.2mm, minor axis is parallel to each other and spacing is 0.2mm, and major axis and minor axis are parallel to light guide plate border respectively; Described LED light source module comprises: aluminum base circuit board, diffuser plate, lower diffusion sheet, and the surface uniform of described aluminum base circuit board lays LED.
The utility model beneficial effect is: the rising angle that accurately can not only limit backlight module, can also save the energy, can reduce the reverberation be irradiated in around instrument, prevent light to the interference of pilot's sight line, improves security, and cheap.
Accompanying drawing explanation
Fig. 1 is the audio-visual picture of back light source brightness test in embodiment; Fig. 2 is the top view of back light source brightness test in embodiment; Fig. 3 is the side view of back light source brightness test in embodiment.
Fig. 4 is conventional prism sheet illustraton of model.
Fig. 5, Fig. 6, Fig. 7 are the three-view diagram of triangular prism micro-structure in embodiment respectively; Fig. 8 is triangular prism array schematic diagram in embodiment.
Fig. 9 utilizes tracepro software to liquid crystal display modeling.
Figure 10 is the light-out effect of conventional prism sheet and triangular prism array combination.
Figure 11 is elliptical lenses schematic diagram in embodiment; Figure 12 and Figure 13 is elliptical lenses array schematic diagram in embodiment.
Figure 14 is the backlight module schematic diagram of an embodiment; Figure 15 is the backlight module close-up schematic view of an embodiment.
Figure 16 is the light-out effect figure of embodiment.
In figure: 1. backlight, 2. luminance meter, the 3. triangular prism made of optical plastic, 4.PET basic unit, 5. aluminum base circuit board, 6.LED, 7. diffuser plate, 8. descend diffusion sheet, 9. light guide plate one, 10. light guide plate two, 11. optical screens, the partial enlarged drawing of 12. light guide plates one and light guide plate two, 13. elliptical lenses unit.
Detailed description of the invention
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in further detail.
A kind of liquid crystal display backlight module that can reduce rising angle, use angle controls light guide plate module and LED light source module, setting light guide plate is outer surface near the side of liquid crystal layer, and side on the other side is inner surface, and Angle ambiguity light guide plate module comprises light guide plate one and light guide plate two; The outer surface of described light guide plate one posts triangular prism array; The inner surface of described light guide plate two posts brightening piece, and outer surface is embedded with lens arra; The minute cells of what described triangular prism array adopted the is triangular prism of periodic arrangement, Rhizoma Sparganii column length rib is parallel to each other and is parallel to light guide plate border, and the leg-of-mutton base angle, main cross section of triangular prism is asymmetric; Described brightening piece adopts the brightening piece of BEF series; The small elliptical lenses unit of periodic arrangement that what described lens arra adopted is, oval major axis is 0.2mm, and minor axis is 0.1mm, and major axis is parallel to each other and spacing is 0.2mm, minor axis is parallel to each other and spacing is 0.2mm, and major axis and minor axis are parallel to light guide plate border respectively; Described LED light source module comprises: aluminum base circuit board, diffuser plate, lower diffusion sheet, and the surface uniform of described aluminum base circuit board lays LED.
Fig. 1, Fig. 2, Fig. 3 are back light source brightness test audio-visual picture, luminance test top view, luminance test side view in embodiment respectively.The center of regulation backlight is O point, and dead ahead S0 is specified test position, and S1, S0, S2 are in same level, and S3, S0, S4 are on same vertical guide.The line of S0 and O point is S
0the line of O, S1 and O point is S
1the line of O, S2 and O point is S
2the line of O, S3 and O point is S
3the line of O, S4 and O point is S
4o.S
1o and S
0o angle is 45 degree, S
0o and S
2o angle is 45 degree, S
3o and S
0o angle is 30 degree, S
0o and S
4o angle is 45 degree.The present embodiment final purpose is restricted to the backlight angle of directly-down liquid crystal display screen: reach 680cd/m at the brightness L of S0 point test O point
2the O point brightness tested from S1, S2, S3 and S4 point drops to 1/3rd below L, and when observation angle is larger time, brightness declines further, light mainly concentrates in the taper that S1, S2, S3, S4 and O point surrounds, and light beyond taper is very weak.
Triangular prism array and brightening piece is adopted to combine, traditional brightening piece utilizes the micro-reproduction technology of 3M, as Fig. 4, the prism structure made by acrylic resin is produced on the optical thin film that PET base material manufactures, and its surface is highly the micro-prism structure of 20 ~ 50 microns.According to geometric optical theory, the light of backlight outgoing, through the ringing of brightening piece and back light source system, finally converges in positive apparent direction outgoing, thus reaches brightening effect.Rising angle due to the brightening piece on domestic market be 70 ° symmetrical, can not meet the demands.
Fig. 5, Fig. 6, Fig. 7 are the three-view diagram of triangular prism micro-structure in embodiment respectively, Fig. 8 is the schematic diagram of triangular prism array, formed by a series of triangular prism dense arrangement, main cross section triangle two base angles of its micro-tri-prism element are y0 and y1, y0 and y1 is respectively 100 ° and 45 ° and plays a part respectively to control this side rising angle, x0 and x1 is decided to be 80 °, and prism heights is 0.05mm.
Tracepro optical design software is adopted to carry out modeling, as Fig. 9 to destination object.
The present embodiment uses the directly-down liquid crystal of 7 cun (83mm × 47mm) to shield, its LED light source module comprises following structure: aluminum base circuit board, 299 LEDs, the LED of to be the model of cree company the be cree Xlamp XQ-B of employing, and diffuser plate, lower diffusion sheet.Angle ambiguity light guide plate module comprises: the outer surface of light guide plate one posts triangular prism array, and the inner surface of light guide plate two posts brightening piece, and outer surface is embedded with lens arra.
Optical path-tracing is carried out to using the model of conventional prism sheet and triangular prism array combination, the result obtained is as Figure 10, article two, curve represents the Luminance Distribution observing O point obtain in perpendicular and horizontal plane respectively, there is asymmetry in the light in liquid crystal display front, in horizontal plane light mainly concentrate on ± 45 degree within, mainly concentrate in perpendicular+30 to-60 degree within.
But in Figure 10, brightness curve fluctuation is very large, and in the scope of specifying, bright dipping is uneven, and still has a lot of light beyond the angle of specifying, and for solving this problem, then increases the uniformity that lens arra improves bright dipping.Oval positive lens array is adopted to collimate in disorder emergent ray, elliptical lenses is added at the outer surface of light guide plate, oval major axis is 0.2mm, minor axis is 0.1mm, major axis is parallel to each other and spacing is 0.2mm, minor axis is parallel to each other and spacing is 0.2mm, major axis and minor axis are parallel to light guide plate border respectively, Figure 11 is elliptical lenses schematic diagram in embodiment, Figure 12 and Figure 13 is the schematic diagram of elliptical lenses array in embodiment, its degree of depth embedding light guide plate is 0.05mm, and this degree of depth light-emitting uniformity is best.Light distribution is now as Figure 16, and the light not only beyond specified angle obviously reduces, and the uniformity of brightness is significantly improved within specified angle.All produce a desired effect at S1, S2, S3, S4 each point, the LCD structure therefore finally determined is as Figure 14 and Figure 15.
Due to the symmetry that light guide plate is horizontal and vertical, therefore the liquid crystal display of other sizes is also applicable to, for the requirement of other rising angles, only need revise the size of leg-of-mutton y1 and y0 in main cross section of micro-tri-prism element of leading triangular prism array, and carry out collimated ray to achieve the goal by the insert depth revising elliptical lenses, therefore, this programme has good transplantability and practicality.
Above-mentioned example is illustrative principle of the present utility model and effect thereof only; for the person of ordinary skill of the art; under the prerequisite not departing from innovation thinking of the present utility model, the some distortion that can also make and improvement, these all belong within the protection domain of the application.
Claims (1)
1. can reduce the liquid crystal display backlight module of rising angle, comprise Angle ambiguity light guide plate module and LED light source module, setting light guide plate is outer surface near the side of liquid crystal layer, and side on the other side is inner surface, it is characterized in that: Angle ambiguity light guide plate module comprises light guide plate one and light guide plate two; The outer surface of described light guide plate one posts triangular prism array; The inner surface of described light guide plate two posts brightening piece, and outer surface is embedded with lens arra;
The small triangular prism of periodic arrangement that what described triangular prism array adopted is, Rhizoma Sparganii column length rib is parallel to each other and is parallel to light guide plate border, and the leg-of-mutton base angle, main cross section of triangular prism is asymmetric;
Described brightening piece adopts the brightening piece of BEF series;
The small elliptical lenses unit of periodic arrangement that what described lens arra adopted is, oval major axis is 0.2mm, and minor axis is 0.1mm, and major axis is parallel to each other and spacing is 0.2mm, minor axis is parallel to each other and spacing is 0.2mm, and major axis and minor axis are parallel to light guide plate border respectively;
Described LED light source module comprises: aluminum base circuit board, diffuser plate, lower diffusion sheet, and the surface uniform of described aluminum base circuit board lays LED.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520086578.3U CN204534282U (en) | 2015-02-06 | 2015-02-06 | The liquid crystal display backlight module of rising angle can be reduced |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520086578.3U CN204534282U (en) | 2015-02-06 | 2015-02-06 | The liquid crystal display backlight module of rising angle can be reduced |
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| CN204534282U true CN204534282U (en) | 2015-08-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520086578.3U Withdrawn - After Issue CN204534282U (en) | 2015-02-06 | 2015-02-06 | The liquid crystal display backlight module of rising angle can be reduced |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104654132A (en) * | 2015-02-06 | 2015-05-27 | 安徽师范大学 | Backlight module for limiting visual angles of LCD (Liquid Crystal Display) screen |
-
2015
- 2015-02-06 CN CN201520086578.3U patent/CN204534282U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104654132A (en) * | 2015-02-06 | 2015-05-27 | 安徽师范大学 | Backlight module for limiting visual angles of LCD (Liquid Crystal Display) screen |
| CN104654132B (en) * | 2015-02-06 | 2017-05-31 | 安徽师范大学 | A kind of backlight module for limiting liquid crystal display visual angle |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20150805 Effective date of abandoning: 20170531 |