CN110208983B - Side-in type backlight module - Google Patents
Side-in type backlight module Download PDFInfo
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- CN110208983B CN110208983B CN201910379005.2A CN201910379005A CN110208983B CN 110208983 B CN110208983 B CN 110208983B CN 201910379005 A CN201910379005 A CN 201910379005A CN 110208983 B CN110208983 B CN 110208983B
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- sawtooth
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- collimating prism
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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
- G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
-
- 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
Abstract
The invention discloses a side-in backlight module, which comprises a light source, a wedge-shaped plate, a reflecting film and a collimating prism film group, wherein the wedge-shaped plate comprises a light inlet surface, a first light outlet surface and a second light outlet surface, the light source is arranged at one side of the light inlet surface, the reflecting film is arranged at one side of the second light outlet surface, the side-in backlight module is characterized in that a first sawtooth film and a second sawtooth film which are parallel to each other in plane and opposite to each other in sawtooth surface are sequentially arranged at one side of the first light outlet surface of the wedge-shaped plate, the collimating prism film group consists of a plurality of collimating prism units which are arranged in parallel, the collimating prism units consist of first triangular sawteeth arranged on the first sawtooth film and second triangular teeth correspondingly arranged on the second sawtooth film, and the side-in backlight module has the advantages that a double-layer collimating prism film combination is used, the structure of the double-layer prism film can realize the function of the traditional rhombic prism film, but the realization is easier in process, the double-layer prism film has obvious advantages in large-scale batch production, and the light-emitting coverage surface of the double-layer prism film is optimized to a certain extent compared with the traditional rhombic prism film.
Description
Technical Field
The present invention relates to a backlight module, and more particularly, to a side-type backlight module for a liquid crystal display.
Background
With the development of the liquid crystal display industry and the increase of the consumption demand of people, the current liquid crystal display devices are increasingly light, thin and high-definition, and the current LED backlight module which still occupies the mainstream is also developed towards the direction of ultra-thin and composite.
As an indispensable part of LCD modules, the backlight module of the side-in type commonly used at present is generally composed of multiple layers, such as: a reflective film, a light guide plate, a diffusion film and two orthogonal brightness enhancement films. Meanwhile, the diffusion angle of light can only be reduced to +/-35 degrees in the prior art, and the application similar to a peep-proof screen puts higher requirements on the collimation of the light emitted by the backlight module.
201210026819.6 published in 7/18/2012 discloses a collimating backlight module capable of generating parallel light beams, which is used in a side-entry backlight display, as shown in fig. 1, the main body of the collimating backlight module includes a reflective film, a wedge plate, a prism film and a collimating film, the wedge plate includes a light-entering surface and two light-exiting surfaces, one of the light-exiting surfaces is attached to the reflective film, and the combination of the wedge plate and the prism film collimates light entering the wedge plate from a light source to exit in a direction perpendicular to a liquid crystal screen. This structure can produce collimated light beam, but wants to realize better collimation effect, and the prism membrane need have very big aspect ratio usually, need have even with the vertical direction's negative angle, and the processing degree of difficulty is big or can not use traditional mode processing, and the preparation degree of difficulty is big, and is with high costs, and is inefficient, is unsuitable as industrial production to there is the dark space of certain degree, influences visual effect.
Disclosure of Invention
The invention aims to solve the technical problem of providing a lateral-entering type backlight module which can achieve the function similar to that of an orthorhombic prism film, is easy to realize in process and is suitable for large-scale mass production.
The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a side income formula backlight unit, includes light source, wedge plate, reflectance coating and collimating prism membrane group, the wedge plate include income plain noodles, first play plain noodles and second play plain noodles, the light source setting be in income plain noodles one side, the reflectance coating setting be in second play plain noodles one side, first play plain noodles one side set gradually the plane parallel and relative first sawtooth membrane of sawtooth surface and second sawtooth membrane, collimating prism membrane group constitute by a plurality of collimating prism units that parallel, collimating prism unit by set up first triangle-shaped sawtooth of first sawtooth membrane with correspond the setting and be in the second triangle-shaped sawtooth of second sawtooth membrane constitute, the bottom surface of first triangle-shaped sawtooth be the income plain noodles of collimating prism unit, the long side of first triangle-shaped sawtooth go out the plain noodles for the centre, second triangle-shaped sawtooth on with the relative side of the middle play plain noodles be the middle plain noodles, the other side surface of the second triangular sawtooth is a reflecting surface, and the bottom surface of the second triangular sawtooth is a light-emitting surface of the collimating prism unit.
The first base angle of the first triangular sawtooth, which is not adjacent to the middle light-emitting surface, is equal to the second base angle of the second triangular sawtooth, which is adjacent to the reflecting surface, and the vertex angle of the second triangular sawtooth is an acute angle.
The vertex angle of the second triangular saw tooth is 20-50 degrees.
The height of the second triangular saw tooth is larger than that of the first triangular saw tooth, and the distance between the light incident surface of the collimating prism unit and the light emergent surface of the collimating prism unit is larger than or equal to the height of the second triangular saw tooth.
And the distance between the light incident surface of the collimating prism unit and the light emergent surface of the collimating prism unit is equal to the height of the second triangular saw teeth.
The distance between the light incident surface of the collimating prism unit and the light emergent surface of the collimating prism unit is greater than the height of the second triangular saw tooth plus the height of the first triangular saw tooth. This corresponds to an air space layer being provided between the two sawtooth films.
A plane film can be arranged in the air space layer between the first sawtooth film and the second sawtooth film.
The refractive index of the planar thin film is lower than that of the first sawtooth film and that of the second sawtooth film.
The vertex angle of the first triangular sawtooth is an obtuse angle.
Another technical solution adopted by the present invention to solve the above technical problems is: the liquid crystal display system using the lateral entrance type backlight module.
Compared with the prior art, the invention has the advantages that the double-layer collimating prism film combination is used, the structure can realize the functions of the traditional rhombic prism film, but the technology is easier to realize, the double-layer collimating prism film combination has obvious advantages in large-scale batch production, and the light-emitting coverage surface of the double-layer prism film is optimized to a certain degree compared with the traditional rhombic prism film.
Drawings
FIG. 1 is a schematic structural diagram of a side-entry backlight module in the prior art;
fig. 2 is a schematic structural view of a side-in type backlight module according to embodiment 1 of the present invention;
fig. 3 is a schematic view of an overall optical path of a side-entry backlight module according to embodiment 1 of the present invention;
fig. 4 is a schematic optical path diagram of a collimating prism unit of a side-entry backlight module according to embodiment 1 of the present invention;
fig. 5 is a schematic view of an overall optical path structure of a side-entry backlight module according to embodiment 2 of the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
Example 1: as shown in fig. 2 to 4, a side-in type backlight module includes an LED light source 21, a wedge plate 22, a collimating prism film group 23 and a reflective film 20, where the wedge plate 22 includes a light incident surface 223, a first light emitting surface 221 and a second light emitting surface 222, the LED light source 21 is disposed on one side of the light incident surface 223, the reflective film 20 is disposed on one side of the second light emitting surface 222, the first light emitting surface 221 of the wedge plate 22 is sequentially disposed with a first sawtooth film 24 and a second sawtooth film 25 which are parallel to each other and opposite to each other, the first sawtooth film 24 and the second sawtooth film 25 are made of optical materials, the collimating prism film group 23 is composed of a plurality of collimating prism units 231, each collimating prism unit 231 includes a first triangular sawtooth 241 disposed on the first sawtooth film 24 and a second triangular sawtooth 251 disposed on the second sawtooth film 25 correspondingly, a bottom surface 2411 of the first triangular sawtooth 241 is a light incident surface of the collimating prism unit 231, a long side 2412 of the first triangular saw tooth 241 is a middle light emitting surface, a side 2512 of the second triangular saw tooth 251 opposite to the middle light emitting surface is a middle light incident surface, another side 2513 of the second triangular saw tooth 251 is a reflecting surface, and a bottom 2511 of the second triangular saw tooth 251 is a light emitting surface of the collimating prism unit 231 (i.e., (ii) (i.e.,)Saw of collimating prism unit for only two films The teeth do not consider other film layers on the sawtooth film, so the definition of the light-emitting surface only refers to the light-emitting of the collimating prism unit Noodle)A first base angle β on the first triangular saw tooth 241, which is not adjacent to the middle light-emitting surface 2412, and a second base angle α on the second triangular saw tooth 251, which is adjacent to the reflecting surface 2513, may be equal to or different from each other, a vertex angle θ of the first triangular saw tooth 241 is an obtuse angle, and a vertex angle γ of the second triangular saw tooth 251 is an acute angle of 20 to 50 degrees, and the angle range is set to be 20 degreesChanging to 50 degrees, the light incident on the edge of the reflecting surface 2513 can be emitted from the edge of the light emitting surface 2511, and the dark area is optimized; height H of the second triangular saw tooth 2512Height H greater than the first triangular serration 2411The distance D between the light incident surface 2411 of the collimating prism unit 231 and the light emitting surface 2511 of the collimating prism unit 231 is equal to the height H of the second triangular saw teeth 2512。
As can be seen from fig. 4, the collimating prism unit 231 at this time corresponds to an oblique square prism. Inside the collimating prism unit 231, the light rays are deflected once through the middle light emitting surface 2412, the refracted light rays enter the second triangular saw teeth 251 through the middle light incident surface 2512, and are deflected twice through the reflecting surface 2513, and the reflected light rays are emitted to the light emitting surface 2511. The collimating prism unit 231 is used for refracting and reflecting the quasi-parallel light beams 01, 02 and 03 emitted from the wedge plate 22 and having a large incident angle with the light incident surface of the collimating prism film group 23 into light beams having a specific angle with the light emergent surface of the collimating prism film group 23.
Example 2: as shown in fig. 5, the other structure is the same as that of embodiment 1, except that the distance D between the light incident surface 2411 and the light emitting surface 2511 of the collimating prism unit 231 is equal to the height H of the second triangular saw teeth 2512Plus the height H of the first triangular serration 2411Plus a gap distance d, a planar film 26 of an optical material having a lower refractive index than the first sawtooth film 24 and the second sawtooth film 25 is disposed between the first sawtooth film 24 and the second sawtooth film 25, and the thickness of the planar film 26 is less than or equal to the gap distance d.
Claims (7)
1. The utility model provides a side income formula backlight unit, includes light source, wedge board, reflectance coating and collimating prism membrane group, the wedge board including going into plain noodles, first play plain noodles and second play plain noodles, the light source setting be in income plain noodles one side, the reflectance coating set up second play plain noodles one side, its characterized in that the first play plain noodles one side of wedge board set gradually the plane parallel and relative first sawtooth membrane of sawtooth plane and second sawtooth membrane, collimating prism membrane group constitute by a plurality of collimating prism units that parallel, collimating prism unit by set up first triangle-shaped sawtooth of first sawtooth membrane with correspond the setting and be in the second triangle-shaped sawtooth of second sawtooth membrane constitute, the bottom surface of first triangle-shaped sawtooth be the income plain noodles of collimating prism unit, the long side of first triangle-shaped sawtooth be middle play plain noodles, the side surface of the second triangular sawtooth, which is opposite to the middle light-emitting surface, is a middle light-entering surface, the other side surface of the second triangular sawtooth is a reflecting surface, the bottom surface of the second triangular sawtooth is the light-emitting surface of the collimating prism unit, a first base angle, which is not adjacent to the middle light-emitting surface, of the first triangular sawtooth is equal to a second base angle, which is adjacent to the reflecting surface, of the second triangular sawtooth, the vertex angle of the first triangular sawtooth is an obtuse angle, and the vertex angle of the second triangular sawtooth is an acute angle ranging from 20 degrees to 50 degrees.
2. The edge-type backlight module of claim 1, wherein the height of the second triangular saw tooth is greater than the height of the first triangular saw tooth, and the distance between the light incident surface of the collimating prism unit and the light emitting surface of the collimating prism unit is greater than or equal to the height of the second triangular saw tooth.
3. The edge-type backlight module of claim 2, wherein the distance between the light incident surface of the collimating prism unit and the light emitting surface of the collimating prism unit is equal to the height of the second triangular saw teeth.
4. The edge-type backlight module of claim 2, wherein the distance between the light incident surface of the collimating prism unit and the light emitting surface of the collimating prism unit is greater than the height of the second triangular saw tooth plus the height of the first triangular saw tooth.
5. The edge-lit backlight module of claim 4, wherein a planar film is disposed between the first sawtooth film and the second sawtooth film.
6. The edge-lit backlight module of claim 5, wherein the refractive index of the planar film is lower than the refractive indices of the first sawtooth film and the second sawtooth film.
7. A liquid crystal display system using the edge-type backlight module of any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910379005.2A CN110208983B (en) | 2019-05-08 | 2019-05-08 | Side-in type backlight module |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910379005.2A CN110208983B (en) | 2019-05-08 | 2019-05-08 | Side-in type backlight module |
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| CN110208983A CN110208983A (en) | 2019-09-06 |
| CN110208983B true CN110208983B (en) | 2022-02-18 |
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| CN201910379005.2A Active CN110208983B (en) | 2019-05-08 | 2019-05-08 | Side-in type backlight module |
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| 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 |
| CN103226261A (en) * | 2013-03-26 | 2013-07-31 | 苏州晶智科技有限公司 | Two-dimensional collimating backlight module used for LCD (liquid crystal display) |
| CN103235446A (en) * | 2013-04-18 | 2013-08-07 | 中国科学院苏州纳米技术与纳米仿生研究所 | Backlight module for liquid crystal display |
| CN105065976A (en) * | 2015-06-02 | 2015-11-18 | 苏州晶智科技有限公司 | Backlight module used for liquid crystal display |
| CN108873144A (en) * | 2017-05-10 | 2018-11-23 | 中国科学院苏州纳米技术与纳米仿生研究所 | Guiding device, backlight module and liquid crystal display |
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| JP4105736B2 (en) * | 2006-04-28 | 2008-06-25 | 日立マクセル株式会社 | Lens sheet, backlight and display device using the same |
| RU2617003C1 (en) * | 2015-11-05 | 2017-04-19 | Самсунг Электроникс Ко., Лтд. | Light guide plate and backlight device containing it |
| CN108646460B (en) * | 2018-06-25 | 2020-09-01 | 福州大学 | High-density pixel array device for realizing emergent light full polarization and manufacturing method thereof |
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2019
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010067441A (en) * | 2008-09-10 | 2010-03-25 | Dainippon Printing Co Ltd | Back light unit and liquid crystal display device |
| 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 |
| CN103226261A (en) * | 2013-03-26 | 2013-07-31 | 苏州晶智科技有限公司 | Two-dimensional collimating backlight module used for LCD (liquid crystal display) |
| CN103235446A (en) * | 2013-04-18 | 2013-08-07 | 中国科学院苏州纳米技术与纳米仿生研究所 | Backlight module for liquid crystal display |
| CN105065976A (en) * | 2015-06-02 | 2015-11-18 | 苏州晶智科技有限公司 | Backlight module used for liquid crystal display |
| CN108873144A (en) * | 2017-05-10 | 2018-11-23 | 中国科学院苏州纳米技术与纳米仿生研究所 | Guiding device, backlight module and liquid crystal display |
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| CN110208983A (en) | 2019-09-06 |
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