CN107144914B - Point light source backlight plate and light guide sheet thereof - Google Patents
Point light source backlight plate and light guide sheet thereof Download PDFInfo
- Publication number
- CN107144914B CN107144914B CN201710419889.0A CN201710419889A CN107144914B CN 107144914 B CN107144914 B CN 107144914B CN 201710419889 A CN201710419889 A CN 201710419889A CN 107144914 B CN107144914 B CN 107144914B
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- light
- light source
- area
- light inlet
- point
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Classifications
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- 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
-
- 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
- G02B6/0075—Arrangements of multiple light guides
-
- 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
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Planar Illumination Modules (AREA)
Abstract
The invention discloses a point light source backlight plate, which comprises a base and a point light source, wherein the base is provided with a groove capable of accommodating a light guide plate, the light guide plate comprises a light guide area and a light inlet area arranged on one side of the light guide area, the interface between the light inlet area and the light guide area is the inner side surface of the light inlet area, one end of the light inlet area is a light inlet end, the side surface of the light inlet end is a light inlet surface, one side of the light inlet surface is intersected with the inner side surface of the light inlet area, the intersection angle is an acute angle, the other end of the light inlet surface is intersected with the outer side surface of the light inlet area, the intersection angle is an obtuse angle, and the outer side surface of the light inlet area gradually approaches to the inner side surface along the direction from the light inlet end to the other end until the outer side surface is intersected with the inner side surface.
Description
Technical Field
The present invention relates to backlight technology, and more particularly, to a point light source backlight and a light guide plate thereof.
Background
The backlight plate is a light source device for ensuring the back of the liquid crystal display to emit light, and generally adopts a side light structure in order to realize uniform light emission. The specific structure is usually a bottom groove, a light source plate and a light guide plate, wherein the light source plate and the light guide plate are arranged on the bottom groove, the light source plate is arranged on one inner side wall of the bottom groove, and the side surface of the light guide plate is abutted to the light emitting surface of the light source plate. When the width of the inner side wall of the backlight plate is wider, the structure can meet the brightness requirement of the backlight plate even if only one point light source is adopted, but a plurality of point light sources are also required to be combined to form the surface light source, so that the backlight plate can emit light uniformly in the whole range in the width direction. This approach increases the cost of the product due to the need for multiple point light sources, and the gradual light emission differences of the multiple point light sources can also result in reduced uniformity of the backlight. Therefore, it is necessary to provide an effect that even when the width of the backlight is relatively wide, uniform light emission in a wide range can be achieved with a single point light source.
Disclosure of Invention
The invention aims to avoid the defects in the prior art and provide a backlight plate and a light guide plate thereof, wherein the backlight plate can realize the effect of full-range uniform light emission by using a single point light source even under the condition that the width of the backlight plate is relatively wide, so that the production cost is saved and the light emitting uniformity is improved.
The aim of the invention is achieved by the following technical scheme:
the utility model provides a light guide piece suitable for pointolite backlight, this light guide piece include light guide area and set up in the light inlet area of one side of light guide area, the interface of light inlet area and light guide area is the medial surface of light inlet area, the one end of light inlet area is the light inlet end, the side of light inlet end forms into the light inlet face, the light inlet area makes the light that gets into from the light inlet face evenly diffuses to the medial surface of light inlet area, and then diffuses to the light guide area.
The light incoming surface is intersected with the inner side surface of the light incoming area at an acute angle, the other end of the light incoming surface is intersected with the outer side surface of the light incoming area at an obtuse angle, and the outer side surface of the light incoming area gradually approaches the inner side surface along the direction from the light incoming end to the other end until the outer side surface is intersected with the inner side surface.
The width of the light inlet end of the light inlet area is smaller than half of the width of the light guide area.
The outer side surface of the light inlet region comprises a first section close to the light inlet end and a second section far away from the light inlet end, and the first section is closer to the inner side surface than the second section in the same interval.
The utility model also provides a pointolite backlight, includes base and pointolite, the base is formed with the recess that can hold arbitrary one kind of light guide piece of claim 1-4, the recess includes the light source district that can hold the pointolite, the pointolite set up in the light source district to make the play plain noodles of pointolite support tightly the light inlet face of light guide piece.
Wherein, be provided with the interlayer between base and the light guide piece.
The interlayer comprises a light absorption layer arranged below the point light source, and the light absorption layer is a black coating.
The interlayer is provided with a positioning notch, and the inner wall of the groove is provided with a bump matched with the positioning notch.
The light source plate is arranged above the light inlet area of the guide tube sheet, the point light source is fixed on the light source plate, the base comprises a frame, a plate groove is formed in the frame, and the light source plate is positioned in the plate groove.
Wherein, be provided with the location bump in the board groove, the light source board be provided with the locating hole that the location bump matees.
The invention has the beneficial effects that: the backlight plate comprises a base and a point light source, wherein the base is provided with a groove capable of accommodating a light guide plate, the light guide plate comprises a light guide area and a light inlet area arranged on one side of the light guide area, the interface between the light inlet area and the light guide area is the inner side surface of the light inlet area, one end of the light inlet area is a light inlet end, the side surface of the light inlet end is a light inlet surface, one side of the light inlet surface is intersected with the inner side surface of the light inlet area and the intersection angle is an acute angle, the other end is intersected with the outer side surface of the light inlet area and the intersection angle is an obtuse angle, and the outer side surface of the light inlet area gradually approaches to the inner side surface along the direction from the light inlet end to the other end until the outer side surface is intersected with the inner side surface. The groove also comprises a light source area capable of accommodating a point light source, and the point light source is arranged in the light source area, so that the light emitting surface of the point light source abuts against the light entering surface of the light guide sheet. Compared with the prior art, the light emitted by the light source of the technology can firstly enter the light inlet area, and the light inlet area can disperse the light emitted by the point light source and guide the light to the light guide area; in addition, because the intersection angle of the light inlet surface of the light inlet region and the side surface of the light guide region (the interface between the light inlet region and the light guide region) is an acute angle, light can diffuse towards the light guide region, on the other hand, the intersection angle of the light inlet surface and the outer side surface of the light inlet region is an obtuse angle, and therefore, part of light can be totally reflected by the outer side surface to dead angles which cannot be irradiated when passing through the surface for direct irradiation, and compared with the prior art, the invention can realize the uniform light emission of the light guide region in the whole range by adopting only a single point light source.
Drawings
The invention will be further described with reference to the accompanying drawings, in which embodiments do not constitute any limitation of the invention, and other drawings can be obtained by one of ordinary skill in the art without inventive effort from the following drawings.
Fig. 1 is an exploded view of a backlight panel of a point light source according to the present invention.
Fig. 2 is a schematic diagram of a combined structure of a light source of a point light source backlight board, a light source board and a light guide board according to the present invention (for showing the light source, the view angle of this drawing is the bottom view angle of fig. 1).
Included in fig. 1 and 2 are:
1-base, 11-groove, 12-light source area, 13-plate groove, 14-positioning convex point, 15-convex block, 2-point light source, 3-light source plate, 31-positioning hole, 4-light guide sheet, 41-light guide area, 42-light inlet area, 43-light inlet surface, 44-first section, 45-second section, 5-diaphragm, 51-light absorption area, 52-light reflection area, 53-positioning notch.
Detailed Description
The invention will be further described with reference to the following examples.
The embodiment of a backlight plate of a point light source 2 according to the present invention, as shown in fig. 1 to 2, comprises:
the utility model provides a point light source 2 backlight, includes base 1, point light source 2 (LED lamp pearl), light source board 3, light guide piece 4 and diaphragm 5, base 1 is formed with the recess 11 that can hold light guide piece 4, and the upper left corner of recess 11 (with fig. 1 as the reference, the below is as the nothing specially indicates, and the azimuthal relation is with fig. 1 as the reference) is the light source district 12 of holding point light source 2, and point light source 2 sets up in light source district 12 to make the play plain noodles of point light source 2 support tightly light inlet face 43 of light guide piece 4.
Specifically, the light guide sheet 4 includes a light guide region 41 and a light inlet region 42 disposed at one side of the light guide region 41, an interface (a dotted line in the drawing, a surface is assumed for convenience of description) between the light inlet region 42 and the light guide region 41 is an inner side surface of the light inlet region 42, one end of the light inlet region 42 is a light inlet end, a side surface of the light inlet end is a light inlet surface 43, and the light inlet region 42 makes light entering from the light inlet surface 43 uniformly diffuse to the inner side surface of the light inlet region 42 and further diffuse to the light guide region 41.
Compared with the prior art, the light emitted by the light source of the technology firstly enters the light inlet area 42, and the light inlet area 42 disperses the light emitted by the point light source 2 and guides the dispersed light to the light guide area 41; in addition, since the intersection angle of the light-entering surface 43 of the light-entering region 42 and the side surface of the light-guiding region 41 (the interface between the light-entering region 42 and the light-guiding region 41) is an acute angle, light will be diffused toward the light-guiding region 41, and on the other hand, the intersection angle of the light-entering surface 43 and the outer side surface of the light-entering region 42 is an obtuse angle, so that part of light will be totally reflected by the outer side surface to dead angles which cannot be irradiated when passing through the surface for direct irradiation, and therefore, compared with the prior art, the invention can realize the uniform light emission of the light-guiding region 41 in the whole range by using only a single point light source 2.
In order to uniformly diffuse the light entering from the light inlet surface 43 to the inner side surface of the light inlet region 42, one side of the light inlet surface 43 intersects with the inner side surface of the light inlet region 42 at an acute angle, the other side intersects with the outer side surface of the light inlet region 42 at an obtuse angle, and the outer side surface of the light inlet region 42 gradually approaches the inner side surface along the direction from the light inlet end to the other side until the outer side surface intersects with the inner side surface. Typically, the width of the light entrance end of the light entrance area 42 is less than half the width of the light guide area 41.
Further, the outer side of the light inlet region 42 includes a first section 44 close to the light inlet end and a second section 45 far from the light inlet end, and the first section 44 is closer to the inner side than the second section 45 in the same interval.
In this embodiment, the light guide 4 and the base 1 are gradually provided with a spacer layer, the spacer layer includes a light absorption region 51 (black coating) and a light reflection region 52, the light absorption region 51 is disposed below the point light source 2, and the light reflection region 52 is disposed below the light guide 4. Since the light at the bottom of the light source is not effectively transmitted to the light guide 4, the light absorption region 51 can effectively absorb the light at the bottom of the point light source 2, thereby avoiding the problem of overlarge local light intensity. In addition, in order to facilitate positioning and installation of the diaphragm 5 and ensure that the light absorbing region 51 is accurately positioned below the light source, the interlayer in the embodiment is provided with a positioning notch 53, and the inner wall of the groove 11 is provided with a bump 15 matched with the positioning notch 53.
In this embodiment, the light source plate 3 for supplying power to the point light source 2 is horizontally disposed above the light inlet end of the upper left corner of the light guide plate, the base 1 includes a frame, the frame is formed with a plate groove 13 corresponding to the light source plate 3 in the upper left corner, the light source plate 3 is positioned in the plate groove 13, in particular, a positioning protruding point 14 is disposed in the plate groove 13, and the light source plate 3 is provided with a positioning hole 31 matched with the positioning protruding point 14. Thereby facilitating installation.
The interlayer is provided with a positioning notch 53, and the inner wall of the groove 11 is provided with a convex block 15 matched with the positioning notch 53. In order to avoid the problem of excessive concentration of light intensity, the front surface of the light source plate 3 is also coated with a light absorbing layer (i.e., a black coating).
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention.
Claims (8)
1. A light guide sheet adapted for point light source backlight plate, characterized in that: the light guide sheet comprises a light guide area and a light inlet area arranged on one side of the light guide area, wherein the interface between the light inlet area and the light guide area is an inner side surface of the light inlet area, one end of the light inlet area is a light inlet end, the side surface of the light inlet end is formed into a light inlet surface, the light entering from the light inlet surface is uniformly diffused to the inner side surface of the light inlet area by the light inlet area and then diffused to the light guide area, one side of the light inlet surface is intersected with the inner side surface of the light inlet area, the intersection angle is an acute angle, the other end is intersected with the outer side surface of the light inlet area, the intersection angle is an obtuse angle, the outer side surface of the light inlet area gradually approaches the inner side surface along the direction from the light inlet end to the other end until the outer side surface is intersected with the inner side surface, the outer side surface of the light inlet area comprises a first section close to the light inlet end and a second section far away from the light inlet end, and the inner side surface of the first section is close to the inner side surface is larger than the second section within the same interval.
2. The lightguide of claim 1 adapted for use in point source backlights, wherein: the width of the light inlet end of the light inlet area is smaller than half of the width of the light guide area.
3. A point light source backlight plate, includes base and pointolite, its characterized in that: the base is formed with a groove capable of accommodating any one of the light guide sheets according to claims 1-2, the groove comprises a light source area capable of accommodating a point light source, and the point light source is arranged in the light source area, so that the light emitting surface of the point light source abuts against the light entering surface of the light guide sheet.
4. A point light source backlight as claimed in claim 3, wherein: an interlayer is arranged between the base and the light guide plate.
5. A point light source backlight as defined in claim 4, wherein: the interlayer comprises a light absorption layer arranged below the point light source, and the light absorption layer is a black coating.
6. A point light source backlight as defined in claim 4, wherein: the interlayer is provided with a positioning notch, and the inner wall of the groove is provided with a bump matched with the positioning notch.
7. A point light source backlight as claimed in claim 3, wherein: the light source plate is arranged above the light inlet area of the light guide plate, the point light source is fixed on the light source plate, the base comprises a frame, a plate groove is formed in the frame, and the light source plate is positioned in the plate groove.
8. A point light source backlight as defined in claim 7, wherein: and positioning protruding points are arranged in the plate grooves, and the light source plate is provided with positioning holes matched with the positioning protruding points.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710419889.0A CN107144914B (en) | 2017-06-06 | 2017-06-06 | Point light source backlight plate and light guide sheet thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710419889.0A CN107144914B (en) | 2017-06-06 | 2017-06-06 | Point light source backlight plate and light guide sheet thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107144914A CN107144914A (en) | 2017-09-08 |
| CN107144914B true CN107144914B (en) | 2023-09-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710419889.0A Active CN107144914B (en) | 2017-06-06 | 2017-06-06 | Point light source backlight plate and light guide sheet thereof |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007066701A (en) * | 2005-08-31 | 2007-03-15 | Optrex Corp | Surface light-emitting device and liquid crystal display device |
| CN1963624A (en) * | 2005-11-10 | 2007-05-16 | 鸿富锦精密工业（深圳）有限公司 | Backlight module |
| CN101750666A (en) * | 2008-12-05 | 2010-06-23 | 清华大学 | Light guide plate and backlight module using thereof |
| TW201400943A (en) * | 2012-12-17 | 2014-01-01 | Synergy Optoelectronics Shenzhen Co Ltd | Backlight module and liquid crystal display |
| CN207037145U (en) * | 2017-06-06 | 2018-02-23 | 东莞恒扬光电有限公司 | A kind of spot light backlight and its light guide sheet |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040212981A1 (en) * | 2003-04-28 | 2004-10-28 | Toppoly Optoelectronics Corp. | LED lighting module |
| JP4835936B2 (en) * | 2007-01-12 | 2011-12-14 | ミネベア株式会社 | Surface lighting device |
-
2017
- 2017-06-06 CN CN201710419889.0A patent/CN107144914B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007066701A (en) * | 2005-08-31 | 2007-03-15 | Optrex Corp | Surface light-emitting device and liquid crystal display device |
| CN1963624A (en) * | 2005-11-10 | 2007-05-16 | 鸿富锦精密工业（深圳）有限公司 | Backlight module |
| CN101750666A (en) * | 2008-12-05 | 2010-06-23 | 清华大学 | Light guide plate and backlight module using thereof |
| TW201400943A (en) * | 2012-12-17 | 2014-01-01 | Synergy Optoelectronics Shenzhen Co Ltd | Backlight module and liquid crystal display |
| CN207037145U (en) * | 2017-06-06 | 2018-02-23 | 东莞恒扬光电有限公司 | A kind of spot light backlight and its light guide sheet |
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| Publication number | Publication date |
|---|---|
| CN107144914A (en) | 2017-09-08 |
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