CN111650684A - Light guide plate - Google Patents
Light guide plate Download PDFInfo
- Publication number
- CN111650684A CN111650684A CN201910159744.0A CN201910159744A CN111650684A CN 111650684 A CN111650684 A CN 111650684A CN 201910159744 A CN201910159744 A CN 201910159744A CN 111650684 A CN111650684 A CN 111650684A
- Authority
- CN
- China
- Prior art keywords
- light
- face
- reflecting
- guide plate
- plate body
- 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.)
- Pending
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Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/0045—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide
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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
- G02F1/133606—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
Landscapes
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Planar Illumination Modules (AREA)
- Light Guides In General And Applications Therefor (AREA)
Abstract
A light guide plate comprises a plate body. The plate body is provided with a light-emitting surface, a reflecting surface and a light-incident end surface which are positioned on two opposite sides. The light incident end face is connected to one side of the light emergent face and the reflecting face and used for allowing light of a light source to be emitted into the plate body and then to be emitted out of the light emergent face, the light incident end face is provided with a vertical face portion vertically connected with the light emergent face and an inclined face portion connected with the vertical face portion and the reflecting face, and the inclined face portion is inclined inwards towards the reflecting face from the vertical face portion towards the reflecting face. The thickness of the plate body in the thickness direction perpendicular to the light emergent surface is T1, the thickness of the perpendicular face in the thickness direction is T2, wherein 0 ≦ T2< T1, so that the phenomenon of gradient light spots generated in the visible area of the light emergent surface close to the light incident end surface can be avoided, and the oblique light beam phenomenon can be improved.
Description
Technical Field
The present invention relates to a light guide plate, and more particularly, to a light guide plate for a side-light type backlight module.
Background
The lcd generally requires a backlight module to display the lcd panel, and the backlight module generally includes a light source and a light guide plate to guide the light scattering direction through the light guide plate to improve the brightness of the lcd panel and ensure the uniformity of the panel brightness.
Referring to fig. 1, a conventional edge-lit backlight module includes a light guide plate 91, a light source 92, and a reflector 93. The light guide plate 91 has a light exit surface 911, a reflective surface 912 opposite to the light exit surface 911, and a light entrance end surface 913 connecting the light exit surface 911 and one side of the reflective surface 912. The light source 92 is disposed opposite to the light-incident end face 913 such that light enters the light guide plate 91 through the light-incident end face 913 and is reflected by the reflecting surface 912, such that most of the light incident on the light guide plate 91 can be emitted from the light-emitting surface 911. The reflection surface 912 and the light incident surface 913 have microstructures (not shown) for diffusing light, so that the light emitted from the light emitting surface 911 is distributed more uniformly. The reflective sheet 93 is disposed opposite to the reflective surface 912 for reflecting the light passing through the reflective surface 912 back into the light guide plate 91, so as to increase the utilization rate of the light. The light source 92 is disposed parallel to the light incident surface 913 to reduce light leakage when light enters the light incident surface 913, and in order to prevent loss of light energy, the thickness t1 of the light incident surface 913 is generally almost equal to the thickness t2 of the light emitting surface of the light source 92. That is, the entire surface of the light incident surface 913 is substantially aligned with the light emitting surface of the light source 92 and is spaced apart from and parallel to each other.
Referring to fig. 2, the light guide plate 91 generally has a visible area 911a corresponding to a screen (not shown) of a display, and due to the requirement of a narrow frame of the display on the full screen, a distance d between the light incident end surface 913 and the visible area 911a is narrower, and microstructures on the light incident end surface 913 for processing light diffusion are shallower and denser in arrangement density, and the diffusion microstructure design on the reflection surface 912 is prone to have a highly directional microstructure design due to the requirement of luminance, so that the requirement of light uniformity required by an area adjacent to the light incident end surface 913 is higher. However, the conventional light guide plate 91 is easy to generate the gradual flare phenomenon near the light incident end surface 913, and when the light emitting surface 911 of the light guide plate 91 is provided with micro-grooves (V-CUT, R-CUT), the oblique light beams are easy to form, which is not in accordance with the usage requirement.
Disclosure of Invention
One objective of the present invention is to provide a light guide plate capable of solving at least one of the above problems.
In some embodiments, the light guide plate of the present invention comprises a plate body. The plate body is provided with a light-emitting surface, a reflecting surface and a light-incident end surface which are positioned on two opposite sides. The light incident end face is connected to one side of the light emergent face and the reflecting face and used for allowing light of a light source to be emitted into the plate body and then to be emitted out of the light emergent face, the light incident end face is provided with a vertical face portion vertically connected with the light emergent face and an inclined face portion connected with the vertical face portion and the reflecting face, and the inclined face portion is inclined inwards towards the reflecting face from the vertical face portion towards the reflecting face. The thickness of the plate body in the thickness direction perpendicular to the light emergent surface is T1, the thickness of the perpendicular surface portion in the thickness direction is T2, and T2 is less than or equal to 0 and less than or equal to T1.
In some embodiments, the inclined surface has an inclination angle a degrees with respect to the light exit surface, where 3 ≦ a ≦ 85.
In some embodiments, the inclined surface has an inclination angle a degrees with respect to the light exit surface, wherein a is less than or equal to 5 and less than or equal to 50.
In some embodiments, 1/3T1 ≦ T2 ≦ 2/3T 1.
The invention has at least the following effects: the light incident end face is provided with the inclined plane part, so that the phenomenon of gradual facula generation in the visible area of the light emergent face close to the light incident end face can be avoided, and the phenomenon of inclined light beams can be improved.
Drawings
Other features and effects of the present invention will become apparent from the following detailed description of the embodiments with reference to the accompanying drawings, in which:
FIG. 1 is a schematic side view illustrating a conventional light guide plate, a light source and a reflective sheet;
FIG. 2 is a schematic diagram illustrating a distance between a viewing area and a light incident end surface of the light guide plate; and
FIG. 3 is a schematic view illustrating a configuration relationship between a light guide plate and a light source according to an embodiment of the present invention.
Detailed Description
Referring to fig. 3, an embodiment of the light guide plate 1 of the present invention includes a plate body 11, where the plate body 11 has an exit surface 111 and a reflection surface 112 located at two opposite sides, and an entrance end surface 113. The light incident end surface 113 is connected to one side of the light emitting surface 111 and the reflecting surface 112 and is used for allowing light of a light source 2 to enter the board 11 and then to be emitted from the light emitting surface 111, so as to be used as a backlight source of a display (not shown). The light incident end surface 113 has a vertical surface portion 113a vertically connected to the light exiting surface 111 and an inclined surface portion 113b connecting the vertical surface portion 113a and the reflecting surface 112, and the inclined surface portion 113b is inclined inward from the vertical surface portion 113a toward the reflecting surface 112 toward the plate 11. The thickness of the plate 11 in a thickness direction D perpendicular to the light emitting surface 111 is T1, the thickness of the vertical surface portion 113a in the thickness direction D is T2 and T2 is smaller than T1 and may be 0, that is, 0 ≦ T2< T1, when T2 is 0, the vertical surface portion 113a does not exist and the inclined surface portion 113b is directly connected to the light emitting surface 111, and a preferred range of T2 is 1/3T1 to 2/3T1, that is, 1/3T1 ≦ T2 ≦ 2/3T 1. The inclined angle of the inclined surface 113b relative to the light emitting surface 111 is a degree, and the inclined angle may be between 3 and 85 degrees, i.e. 3 ≦ a ≦ 85, preferably between 5 and 50 degrees, i.e. 5 ≦ a ≦ 50. The thickness of the vertical surface portion 113a and the inclined angle of the inclined surface portion 113b can be adjusted according to the thickness of the plate body 11, and the distance between the connection portion of the inclined surface portion 113b and the reflection surface 112 is preferably not less than 0.03mm compared with the inward shrinkage distance of the vertical surface portion 113 a. The light incident end surface 113 having the inclined surface portion 113b can prevent the visible area of the light emitting surface 111 from generating a gradual layer flare near the light incident end surface 113.
In the present embodiment, the surface of the light-incident end surface 113 is a smooth surface, but in a modified embodiment, the light-incident end surface 113 may also be a rough surface, or the light-incident end surface 113 may be provided with a light-splitting (diffusing) microstructure, which may be determined according to the usage requirement, and is not limited to the present embodiment. In the present embodiment, the reflective surface 112 is provided with a dot 112a and is a directional reflective structure, and the structure of the dot 112a can be manufactured by using the prior art and can be designed according to the use requirement. In addition, in the present embodiment, the light-emitting surface 111 is a flat surface, but in a modified embodiment, the light-emitting surface 111 may have a micro-groove structure (V-CUT, R-CUT), and if the light-emitting surface 111 has the micro-groove structure, the oblique light beam phenomenon caused by the micro-groove structure can be improved by the inclined surface portion 113b of the light-incident end surface 113.
In summary, the light incident surface 113 having the inclined surface portion 113b can prevent the visible area of the light emitting surface 111 from generating a gradual flare near the light incident surface 113, and can improve the oblique beam phenomenon.
The above description is only an example of the present invention, and the scope of the present invention should not be limited thereby, and the invention is still within the scope of the present invention by simple equivalent changes and modifications made according to the claims and the contents of the specification.
Claims (4)
1. A light guide plate, comprising: a plate body; the plate body is provided with a light-emitting surface and a reflecting surface which are positioned at two opposite sides, and a light-entering end surface which is connected with one side of the light-emitting surface and one side of the reflecting surface and is used for allowing light rays of a light source to be emitted into the plate body and then emitted from the light-emitting surface; the method is characterized in that:
the light incident end face is provided with a vertical face part vertically connected with the light emergent face and an inclined face part connecting the vertical face part and the reflecting face, and the inclined face part is inclined inwards towards the reflecting face from the vertical face part;
the thickness of the plate body in the thickness direction perpendicular to the light emergent surface is T1, the thickness of the perpendicular surface portion in the thickness direction is T2, and T2 is less than or equal to 0 and less than or equal to T1.
2. The light guide plate according to claim 1, wherein: the inclination angle of the inclined plane part relative to the light emergent surface is A degrees, wherein 3 is less than or equal to A is less than or equal to 85.
3. The light guide plate according to claim 1, wherein: the inclination angle of the inclined plane part relative to the light emergent surface is A degrees, wherein A is less than or equal to 5 and less than or equal to 50.
4. The light guide plate according to claim 1, wherein: 1/3T1 ≦ T2 ≦ 2/3T 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910159744.0A CN111650684A (en) | 2019-03-04 | 2019-03-04 | Light guide plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910159744.0A CN111650684A (en) | 2019-03-04 | 2019-03-04 | Light guide plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111650684A true CN111650684A (en) | 2020-09-11 |
Family
ID=72346149
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910159744.0A Pending CN111650684A (en) | 2019-03-04 | 2019-03-04 | Light guide plate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111650684A (en) |
Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201310821Y (en) * | 2008-11-17 | 2009-09-16 | 冠捷投资有限公司 | Light-guiding plate and backlight module |
| TW200942743A (en) * | 2008-04-08 | 2009-10-16 | Teknowledge Dev Corp | Light source apparatus |
| CN201437963U (en) * | 2009-07-07 | 2010-04-14 | 台湾奈普光电科技股份有限公司 | Structural improvement for light guide plate |
| CN203324500U (en) * | 2013-05-16 | 2013-12-04 | 富昱科技开发股份有限公司 | Light guiding board with wedge-shaped light incidence structure |
| CN203324502U (en) * | 2013-06-14 | 2013-12-04 | 富昱科技开发股份有限公司 | Light guide plate with microstructures |
| CN103576359A (en) * | 2012-07-26 | 2014-02-12 | 扬升照明股份有限公司 | Composite light guide plate and display device |
| CN104421770A (en) * | 2013-09-11 | 2015-03-18 | 联想(北京)有限公司 | Backlight module and display device |
| CN104678479A (en) * | 2013-12-02 | 2015-06-03 | 四川省迪特尔电子有限公司 | Light guide plate |
| CN105842775A (en) * | 2016-04-25 | 2016-08-10 | 深圳市华星光电技术有限公司 | Light guide plate, backlight module and display device |
| CN106094097A (en) * | 2016-08-18 | 2016-11-09 | 京东方科技集团股份有限公司 | Light guide plate and apply its backlight module, display device |
| TWI571594B (en) * | 2016-03-01 | 2017-02-21 | 茂林光電科技股份有限公司 | Lighting apparatus and the light guide plate design method thereof |
| CN106772771A (en) * | 2017-01-03 | 2017-05-31 | 合肥鑫晟光电科技有限公司 | Light guide plate, backlight module and display device |
| CN106772760A (en) * | 2016-12-23 | 2017-05-31 | 武汉华星光电技术有限公司 | A kind of light guide plate and liquid crystal module |
| CN206831404U (en) * | 2017-03-22 | 2018-01-02 | 上海顿格电子贸易有限公司 | A kind of light guide structure and lighting device |
| CN107561630A (en) * | 2017-09-15 | 2018-01-09 | 青岛海信电器股份有限公司 | Backlight module and display device |
-
2019
- 2019-03-04 CN CN201910159744.0A patent/CN111650684A/en active Pending
Patent Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW200942743A (en) * | 2008-04-08 | 2009-10-16 | Teknowledge Dev Corp | Light source apparatus |
| CN201310821Y (en) * | 2008-11-17 | 2009-09-16 | 冠捷投资有限公司 | Light-guiding plate and backlight module |
| CN201437963U (en) * | 2009-07-07 | 2010-04-14 | 台湾奈普光电科技股份有限公司 | Structural improvement for light guide plate |
| CN103576359A (en) * | 2012-07-26 | 2014-02-12 | 扬升照明股份有限公司 | Composite light guide plate and display device |
| CN203324500U (en) * | 2013-05-16 | 2013-12-04 | 富昱科技开发股份有限公司 | Light guiding board with wedge-shaped light incidence structure |
| CN203324502U (en) * | 2013-06-14 | 2013-12-04 | 富昱科技开发股份有限公司 | Light guide plate with microstructures |
| CN104421770A (en) * | 2013-09-11 | 2015-03-18 | 联想(北京)有限公司 | Backlight module and display device |
| CN104678479A (en) * | 2013-12-02 | 2015-06-03 | 四川省迪特尔电子有限公司 | Light guide plate |
| TWI571594B (en) * | 2016-03-01 | 2017-02-21 | 茂林光電科技股份有限公司 | Lighting apparatus and the light guide plate design method thereof |
| CN105842775A (en) * | 2016-04-25 | 2016-08-10 | 深圳市华星光电技术有限公司 | Light guide plate, backlight module and display device |
| CN106094097A (en) * | 2016-08-18 | 2016-11-09 | 京东方科技集团股份有限公司 | Light guide plate and apply its backlight module, display device |
| CN106772760A (en) * | 2016-12-23 | 2017-05-31 | 武汉华星光电技术有限公司 | A kind of light guide plate and liquid crystal module |
| CN106772771A (en) * | 2017-01-03 | 2017-05-31 | 合肥鑫晟光电科技有限公司 | Light guide plate, backlight module and display device |
| CN206831404U (en) * | 2017-03-22 | 2018-01-02 | 上海顿格电子贸易有限公司 | A kind of light guide structure and lighting device |
| CN107561630A (en) * | 2017-09-15 | 2018-01-09 | 青岛海信电器股份有限公司 | Backlight module and display device |
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