CN110032004B - Wedge-shaped plate for collimating backlight module and collimating backlight module - Google Patents
Wedge-shaped plate for collimating backlight module and collimating backlight module Download PDFInfo
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- CN110032004B CN110032004B CN201910382522.5A CN201910382522A CN110032004B CN 110032004 B CN110032004 B CN 110032004B CN 201910382522 A CN201910382522 A CN 201910382522A CN 110032004 B CN110032004 B CN 110032004B
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133605—Direct backlight including specially adapted reflectors
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
- G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Planar Illumination Modules (AREA)
Abstract
The invention discloses a wedge-shaped plate for collimating a backlight module, which comprises a light inlet surface opposite to a light source, a first light outlet surface opposite to a reflector and a second light outlet surface opposite to a light collimating mechanism, wherein a wedge angle is formed between the first light outlet surface and the second light outlet surface, at least one air gap layer parallel to the first light outlet surface is arranged in the wedge-shaped plate, and the second light outlet surface is a seamless closed plane. So that uniform light emission is formed on the whole second light emitting surface, and the light emitting uniformity of the wedge-shaped plate is greatly improved.
Description
Technical Field
The present invention relates to a collimating backlight module, and more particularly, to a wedge plate for a collimating backlight module and a collimating backlight module applied to a liquid crystal display system.
Background
Liquid crystal displays are widely used because of their advantages such as low cost, high resolution, and vivid color. However, since the liquid crystal in the lcd panel does not have the light-emitting property, the backlight module is required to provide the light source to achieve the display effect of the display. Because the divergence angle of the light source is large, the light emitted by the light source is coupled into the display through the light guide plate, and the actually and finally utilized energy is less than 10%, so that the light energy utilization rate of the whole display is low.
In recent years, with the development of display industry, more and more small-sized liquid crystal displays such as mobile phones, calculators, watches and the like not only require the displays to be light and thin, compact in structure and low in power consumption, but also have more special requirements on the light-emitting angle, for example, a display screen with a peep-proof effect requires the divergence angle of the displays to be smaller than a specific angle, and is mainly used for protecting private information in public places. These demands put higher demands on the structure of the backlight, the light emitting angle of the light source, and the efficiency of the light source. In summary, the lcd has a certain alignment requirement for the emergent light of the backlight module, and especially in the special display industry, the alignment requirement is higher.
PCT patent publication WO 2008/100443 a2, published on 21/8/2008, proposes a compact collimating reflector film (CCR) that produces a collimated beam of light, as shown in fig. 1 (a). The collimation reflection film is positioned at the lowest part of the backlight module and is similar to a boat-shaped structure as a whole, and the light sources are positioned at two ends of the collimation reflection film. The collimating and reflecting film comprises a light incident surface, namely a light reflecting surface, and the structure of the light incident surface is a sawtooth structure. Each sawtooth is designed with different angles and slopes, and light emitted by the light source at different angles is reflected by the sawteeth at different angles and slopes and changes direction to be emitted in a direction vertical to the liquid crystal screen.
Although the structure shown in fig. 1(a) can generate collimated light beams, the light emitted by the light source is continuous large-angle divergent light, and the collimating reflective film is a discontinuous zigzag structure, so that the collimating effect of the generated collimated light is not ideal. Meanwhile, due to the fact that the discontinuous sawtooth structure is fine, each sawtooth has a specific angle and slope, the processing difficulty is very high, and the manufacturing cost is very high.
The patent application publication No. 201210026819.6, published on 7/18/2012, discloses a collimating backlight module capable of generating parallel light beams, which is used in a side-entry backlight display and includes a main body including a reflective film, a wedge-shaped film, a prism film and a collimating film. The wedge-shaped film comprises a light incident surface and two light emergent surfaces, wherein one light emergent surface is attached to the reflecting film. The wedge-shaped film generates a certain parallel light beam with a small divergence angle, and the prism film collimates the light emitted by the wedge-shaped film into the direction vertical to the liquid crystal screen for emission. However, as shown in fig. 1(b), although this structure can produce a collimated light beam, the brightness of the produced collimated light beam at the wedge tip is greater than that at the wedge tail, and the uniformity is to be further improved.
Disclosure of Invention
The invention aims to solve the technical problem of providing a wedge-shaped plate with good emergent light uniformity for a collimation backlight module and the collimation backlight module.
The technical scheme adopted by the invention for solving the technical problems is as follows: a wedge-shaped plate for collimating a backlight module comprises a light inlet face opposite to a light source, a first light outlet face opposite to a reflector and a second light outlet face opposite to a light collimating mechanism, wherein a wedge angle is formed between the first light outlet face and the second light outlet face, at least one air gap layer parallel to the first light outlet face is arranged in the wedge-shaped plate, and the second light outlet face is a seamless closed plane.
Compared with the prior art, the light-emitting device has the advantages that the air gap layers parallel to the first light-emitting surface are arranged, the whole wedge-shaped plate is formed by overlapping a plurality of layered wedge-shaped plates with the same wedge angle, when light is transmitted, the wedge-shaped plate structure divides light of a light source into a plurality of parts, the tail end of each layered wedge-shaped plate generates strong emergent light, the emergent light is emitted at different positions of the second light-emitting surface, and therefore the light-emitting position can be adjusted manually by adjusting the lengths of different air gap layers, namely changing the positions and the sizes of the layered wedge-shaped plates, uniform emergent light is formed on the whole second light-emitting surface, and the uniformity of emergent light of the wedge-shaped plate is greatly improved.
Another technical solution adopted by the present invention to solve the above technical problems is to apply the above wedge plate to a collimating backlight module, and the specific technical solution is: the utility model provides a collimation backlight unit, includes light source, speculum, light collimation mechanism and wedge plate, the wedge plate include with the relative income plain noodles of light source, with the relative first play plain noodles of speculum and with the relative second play plain noodles of light collimation mechanism, first go out the plain noodles with the second go out the plain noodles between become the wedge angle, its characterized in that the wedge plate in be provided with at least one deck with the parallel air gap layer of first play plain noodles, the second go out the plain noodles and be seamless plane of sealing.
The light incident surface is a seamless closed plane.
The included angle between the light incident surface and the first light emergent surface is an obtuse angle, so that the light energy utilization rate can be improved.
The wedge angle is less than or equal to 10 degrees.
The light collimation mechanism can be a parallelepiped prism array or a triangular prism array.
The other technical scheme is a liquid crystal display system using the collimation backlight module.
Drawings
FIG. 1a is a schematic diagram of a collimating backlight module according to a prior art;
FIG. 1b is a schematic diagram of a collimating backlight module according to a second prior art;
fig. 2 is a schematic structural view of a wedge plate according to example 1 of the present invention;
fig. 3 is a schematic structural view of a wedge plate according to example 2 of the present invention;
fig. 4 is a schematic structural view of a wedge plate according to example 3 of the present invention;
fig. 5 is a schematic structural diagram of a collimating backlight module according to example 4 of the present invention;
fig. 6 is a schematic structural diagram of a collimating backlight module according to example 5 of the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
Example 1 of an embodiment of the present invention is as follows: a wedge-shaped plate 20 for collimating backlight module comprises a light incident surface 21 opposite to a light source 10, a first light emitting surface 22 opposite to a reflector 30, and a second light emitting surface 23 opposite to a light collimating mechanism, wherein a wedge angle is formed between the first light emitting surface 22 and the second light emitting surface 23, and the wedge angle is usually less than or equal to 10 degrees. The wedge-shaped plate 20 is provided therein with a plurality of air gap layers parallel to the first light-emitting surface 22, and the second light-emitting surface 23 is a seamless closed plane. The whole wedge plate 20 is thus divided into a multi-layered wedge plate having a plurality of parallel optical layers in a comb-like structure, the optical layers may be the same or different in thickness and length, but the ends are connected to form a whole. The whole structure of the wedge-shaped plate is made of optical materials, and the number of optical layered layers is more than two layers and can reach dozens of layers according to the requirement of light-emitting uniformity. In the figure 223, 224 are optical layers with different lengths and thicknesses, and the upper surface and the lower surface of each optical layer are parallel planes. Fig. 2 illustrates in detail the light path trajectory of a light ray passing through the wedge plate 20 of the present invention, the light ray enters each optical layer from the light incident surface 21 of the wedge plate 20, and the light beam entering the wedge plate 20 from the light source 10 is divided into the same number of parts as the optical layers by this structure, in the figure, 221 and 222 are air gap layers between the optical layers, and the light ray follows snell's law when propagating in each parallel optical layer (for example, n is 1.58); at this time, the angle range of the light ray entering the wedge-shaped plate 20 is α ═ arcsin (1/1.58) ± 40 °, when the light ray propagates in each optical layer, the included angle β between the light ray and the normal lines of the upper and lower parallel planes is 90- α or more than 50 °, and when the included angle β is 40 °, the total reflection condition is satisfied, so the light ray does not exit. When the light reaches the wedge-shaped plate 20 at the tail end of each layer, the included angle between the light and the normal line of the first light-emitting surface 22 or the second light-emitting surface 23 of the wedge-shaped plate 20 is reduced by one wedge angle after every reflection, and the light is emitted until the emission condition is met. It can be understood that the wedge-shaped plate structure divides the light of the light source 10 into a plurality of parts to be emitted at different positions of the two light-emitting surfaces, and the light-emitting positions are adjusted by adjusting the lengths of different optical layers, i.e. the positions and the sizes of the layered wedge-shaped plate, so as to form uniform light emission on the second light-emitting surface 23. The reflector 30 is disposed on one side of the first light-emitting surface 22 on the short side of the wedge-shaped film 20, and the reflection surface of the reflector 30 is parallel to the first light-emitting surface 22 of the adjacent wedge-shaped film 20, and the emergent light from the first light-emitting surface 22 in the wedge-shaped film 20 irradiates the reflector 30, and is reflected back to the wedge-shaped plate by the reflector 30 to be reused.
As shown in fig. 3, in the example 2 of this embodiment, in order to improve the light energy utilization rate, an included angle between the light incident surface 21 of the wedge-shaped plate 20 and the first light emitting surface 22 is set to be an obtuse angle, so that an included angle between the light ray propagating to the tail end small wedge-shaped plate in different optical layers and a normal line of the second light emitting surface 23 of the wedge-shaped plate becomes smaller, and the light ray can be emitted from the second light emitting surface 23 of the wedge-shaped plate 20 earlier, thereby increasing the light emitting rate.
In example 3 of this embodiment, as shown in fig. 4, the light incident surface 21 and the second light emitting surface 23 of the wedge-shaped plate 20 are both seamless closed planes, the middle region is a multi-optical layered structure, an air gap layer is formed between each optical layered layer, the thickness and the length of each optical layered layer may be the same or different, the overall structure of the wedge-shaped plate is made of an optical material, and the number of optical layered layers is greater than two layers and may be as many as several tens of layers according to the requirement of light emitting uniformity.
Example 4 of the present embodiment as shown in fig. 5, a backlight module capable of providing parallel plane light beams, which can be applied to a liquid crystal display system, includes a light source 10, a multi-layer structural plate 20, a reflector 30 and a collimating prism array 40, wherein the bases of the wedge-shaped plate 20 and the collimating prism array 40 are optical materials, and the reflector 30 is a film with a certain reflectivity. The collimating prism array 40 is disposed at the second light-emitting surface 23 of the wedge plate 20, and has a structure of a parallelepiped prism array, a surface of the collimating prism array adjacent to the light-emitting surface of the wedge plate 20 is referred to as a collimating prism array light-in surface 441, and the other opposite plane is referred to as a collimating prism array light-out surface 442. The collimating prism array is used for refracting the quasi-parallel light beams 01, 02 and 03 which are emitted from the second light emitting surface 23 of the wedge-shaped plate and have a larger incident angle with the light incident surface 441 of the collimating prism array into quasi-parallel light beams which are perpendicular to the light emitting surface 442 of the collimating prism array 40 or have a specific included angle after being totally reflected by the surface 443.
Example 5 of this embodiment is shown in fig. 6, a triangular prism is used to replace a parallelepiped prism, a sawtooth surface of a triangular prism array is a light incident surface, light is transmitted through a 541 surface, total reflection is achieved on a surface 542, and finally, the light is transmitted through a plane 543 of the triangular prism array. The inclination angle of the surface 542 is determined by the angles of the incident light rays 01 and 02 entering the structure, so that the totally reflected light rays are approximately collimated and emitted, and the structure can also realize the effect of the prism array on light ray collimation.
Claims (10)
1. A wedge-shaped plate for collimating a backlight module comprises a light inlet face opposite to a light source, a first light outlet face opposite to a reflector and a second light outlet face opposite to a light collimating mechanism, wherein a wedge angle is formed between the first light outlet face and the second light outlet face.
2. The wedge plate for a collimating backlight module of claim 1, wherein said light-entering surface is a seamless closed plane.
3. The wedge plate for collimating backlight module of claim 1, wherein an angle between the light incident surface and the first light emitting surface is an obtuse angle.
4. A wedge plate for collimating backlight modules as in claim 1, wherein said wedge angle is 10 degrees or less.
5. The utility model provides a collimation backlight unit, includes light source, speculum, light collimation mechanism and wedge plate, the wedge plate include with the relative income plain noodles of light source, with the relative first play plain noodles of speculum and with the relative second play plain noodles of light collimation mechanism, first go out the plain noodles with the second go out the plain noodles between become the wedge angle, its characterized in that the wedge plate in be provided with at least one deck with the parallel air gap layer of first play plain noodles, the second go out the plain noodles and be seamless plane of sealing.
6. The collimating backlight module of claim 5, wherein the light-incident surface is a seamless closed plane.
7. The collimating backlight module of claim 5, wherein an included angle between the light incident surface and the first light emitting surface is an obtuse angle.
8. The collimating backlight module of claim 5, wherein the wedge angle is 10 degrees or less.
9. The collimating backlight module of any of claims 5-8, wherein the light collimating mechanism is a parallelepiped prism array or a triangular prism array.
10. A liquid crystal display system using the collimating backlight module of any of claims 5-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910382522.5A CN110032004B (en) | 2019-05-09 | 2019-05-09 | Wedge-shaped plate for collimating backlight module and collimating backlight module |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910382522.5A CN110032004B (en) | 2019-05-09 | 2019-05-09 | Wedge-shaped plate for collimating backlight module and collimating backlight module |
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| Publication Number | Publication Date |
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| CN110032004A CN110032004A (en) | 2019-07-19 |
| CN110032004B true CN110032004B (en) | 2021-09-07 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113238314B (en) * | 2021-05-06 | 2022-11-01 | 苏州晶智科技有限公司 | Wedge-shaped light guide plate for collimating backlight module and collimating backlight module thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0539496A1 (en) * | 1990-07-16 | 1993-05-05 | SIMON, Jerome H. | Tapered optical waveguides for uniform energy distribution including energy bridging |
| CN102200659A (en) * | 2010-03-24 | 2011-09-28 | 三星电子株式会社 | Display apparatus |
| CN102588835A (en) * | 2012-02-08 | 2012-07-18 | 苏州晶智科技有限公司 | Novel backlight module for liquid crystal display |
| CN102606955A (en) * | 2012-03-12 | 2012-07-25 | 深圳市华星光电技术有限公司 | Backlight module and liquid crystal display |
| CN104832886A (en) * | 2015-05-06 | 2015-08-12 | 合肥京东方显示光源有限公司 | Light guide plate, backlight module, and equipment and method for manufacturing light guide plate |
| CN106646718A (en) * | 2016-10-20 | 2017-05-10 | 苏州向隆塑胶有限公司 | Lateral backlight module with section light emitting control, and display apparatus |
| CN107329202A (en) * | 2017-07-12 | 2017-11-07 | 上海誉沛光电科技有限公司 | A kind of collimated back structure |
| CN108153054A (en) * | 2018-01-03 | 2018-06-12 | 京东方科技集团股份有限公司 | Backlight module and display device |
-
2019
- 2019-05-09 CN CN201910382522.5A patent/CN110032004B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0539496A1 (en) * | 1990-07-16 | 1993-05-05 | SIMON, Jerome H. | Tapered optical waveguides for uniform energy distribution including energy bridging |
| CN102200659A (en) * | 2010-03-24 | 2011-09-28 | 三星电子株式会社 | Display apparatus |
| CN102588835A (en) * | 2012-02-08 | 2012-07-18 | 苏州晶智科技有限公司 | Novel backlight module for liquid crystal display |
| CN102606955A (en) * | 2012-03-12 | 2012-07-25 | 深圳市华星光电技术有限公司 | Backlight module and liquid crystal display |
| CN104832886A (en) * | 2015-05-06 | 2015-08-12 | 合肥京东方显示光源有限公司 | Light guide plate, backlight module, and equipment and method for manufacturing light guide plate |
| CN106646718A (en) * | 2016-10-20 | 2017-05-10 | 苏州向隆塑胶有限公司 | Lateral backlight module with section light emitting control, and display apparatus |
| CN107329202A (en) * | 2017-07-12 | 2017-11-07 | 上海誉沛光电科技有限公司 | A kind of collimated back structure |
| CN108153054A (en) * | 2018-01-03 | 2018-06-12 | 京东方科技集团股份有限公司 | Backlight module and display device |
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| CN110032004A (en) | 2019-07-19 |
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