CN101737725B - Backlight module and liquid crystal display - Google Patents
Backlight module and liquid crystal display Download PDFInfo
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- CN101737725B CN101737725B CN 200810176745 CN200810176745A CN101737725B CN 101737725 B CN101737725 B CN 101737725B CN 200810176745 CN200810176745 CN 200810176745 CN 200810176745 A CN200810176745 A CN 200810176745A CN 101737725 B CN101737725 B CN 101737725B
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- plane
- guide plate
- microstructure
- light guide
- backlight module
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Abstract
The invention relates to a backlight module and a liquid crystal display. The backlight module comprises at least one point light source and a light guide plate, wherein the light guide plate comprises a light emergent surface, a bottom surface, a light incoming surface, a first lateral surface, a second lateral surface, a first microstructure and a second microstructure, wherein the bottom surface is opposite to the light emergent surface; the light incoming surface is connected with the light emergent surface and the bottom surface; the point light source is configured on a position adjacent to the light incoming surface; the first microstructure is formed on the light incoming surface; the first lateral surface is opposite to the light incoming surface and connected with the light emergent surface and the bottom surface; the second lateral surface is connected with the light emergent surface, the bottom surface, the light incoming surface and the first lateral surface; and the second microstructure is formed on the second lateral surface and used for reflecting incoming light beams incoming into the second microstructure.
Description
Technical field
The present invention relates to a kind of backlight module and comprise the liquid crystal display of this backlight module.
Background technology
Figure 1 shows that the schematic diagram of the existing backlight module 100 take pointolite as side light source.As shown in Figure 1, when adopting pointolite 102 (for example light emitting diode) as side light source, the light characteristic that goes out based on pointolite 102, the front end of light guide plate 104 can produce alternatively distributed clear zone (hot spot) HS and dark space (dark spot) DS, therefore need to reserve large-area mixed light zone luminous energy is evenly spread, cause light guide plate 104 effectively even bright dipping zones significantly to reduce.For addressing this problem, as shown in Figure 2, in the design of another existing backlight module 200, can microstructure 106 be set in the light inlet side of light guide plate 104, owing to can strengthen the deviation angle of incident beam by the light beam of microstructure 106, can make thus clear zone HS be formed at the zone of the close light inlet side of light guide plate 104, thereby effectively reduce the area in mixed light zone.Yet, as shown in Figure 1, side direction light beam I can be returned in the light guide plate 104 by light guide plate side 104a reflection originally,, in case as shown in Figure 2 since the expansion light effect of microstructure 106 so that after the deviation angle of incident beam strengthens, can cause part side direction light beam I ' to reflect outside the light guide plate 104, so not only reduce the light utilization ratio, and meet with external member when reflecting light guide plate 104 outer part side direction light beam I ', when for example having the glue frame 108 of cloudy surface reflecting material, part side direction light beam I ' can be formed obvious side bright spot 112 by the surface reflection of glue frame 108.
Summary of the invention
The invention provides a kind of backlight module and liquid crystal display, it can effectively be avoided the generation of backlight module side bright spot and have good light utilization ratio.
One embodiment of the invention propose a kind of backlight module, comprise at least one pointolite and a light guide plate.Light guide plate comprises exiting surface, bottom surface, incidence surface, the first side, the second side, the first microstructure and the second microstructure.The bottom surface is with respect to exiting surface, and incidence surface connects exiting surface and bottom surface, and pointolite is disposed at the position of contiguous incidence surface, and the first microstructure is formed at incidence surface.The first side is with respect to incidence surface, and connection exiting surface and bottom surface.The second side connects exiting surface, bottom surface, incidence surface and the first side.The second microstructure is formed at the second side, return in the light guide plate for the beam reflection that will be incident in the second microstructure, wherein said the second microstructure comprises a plurality of cylinders from described the second side extending projection, and wherein each described cylinder has the first inclined-plane and connects second inclined-plane on described the first inclined-plane, described the first inclined-plane than described the second inclined-plane more near described incidence surface, and the length on described the first inclined-plane is greater than the length on described the second inclined-plane, and the angle of wherein said the first inclined-plane and described the second side is more than or equal to 10 degree and is less than or equal to 30 degree.
For reaching one of above-mentioned or partly or entirely purpose or other purpose, one embodiment of the invention propose a kind of liquid crystal display, comprise display panels and above-mentioned backlight module.Backlight module is disposed at a side of display panels, and being used for provides display panels required area source, and the exiting surface of the light guide plate of backlight module is towards display panels.
Design based on above-mentioned each embodiment, when the side direction light beam that is had wide-angle by the microstructure deviation of incidence surface is incident to the light guide plate side, the microstructure that the side direction beam encounters is formed at the second side will satisfy total reflection condition and be reflected back toward in the light guide plate, so can effectively avoid the side direction light beam to reflect light guide plate and form the situation of side bright spot, and can improve the light utilization ratio because the side direction light beam is reflected back toward light guide plate.
Other purpose of the present invention and advantage can be further understood from technical characterictic disclosed in this invention.The present invention is above-mentioned to be become apparent more with other objects, features and advantages in order to allow, and embodiment cited below particularly also cooperates accompanying drawing, is described in detail below.
Description of drawings
Figure 1 shows that the schematic diagram of the existing backlight module take pointolite as side light source;
Figure 2 shows that the schematic diagram of another the existing backlight module take pointolite as side light source;
Fig. 3 is the schematic side view according to the liquid crystal display of one embodiment of the invention;
Fig. 4 is the schematic top plan view of the partial component of the backlight module among Fig. 3;
Fig. 5 is the part enlarged diagram according to the light guide plate of one embodiment of the invention;
Fig. 6 and Fig. 7 are schematic diagram, illustrate microstructure to be set in the effect of light guide plate side;
Fig. 8 is the schematic top plan view according to the backlight module of another embodiment of the present invention; And
Fig. 9 is the schematic top plan view according to the backlight module of another embodiment of the present invention.
[primary clustering symbol description]
10 liquid crystal display
20 display panels
30 backlight modules
32 light guide plate
321 incidence surfaces
322 exiting surfaces
323 bottom surfaces
324,325,326 sides
34 pointolites
36 reflector plates
38 optical diaphragm group
42,44,44a, 44b microstructure
100 backlight modules
102 pointolites
104 light guide plate
104a light guide plate side
106 microstructures
108 glue frames
112 side bright spots
200 backlight modules
D orthogonal projection length
I, I ', R, T side direction light beam
The P cylinder
S1 the first inclined-plane
S2 the second inclined-plane
The S3 cambered surface
The θ angle
The IN spacing
The DS dark space
The HS clear zone
Embodiment
About aforementioned and other technology contents, characteristics and effect of the present invention, in the detailed description below in conjunction with reference to the accompanying drawings embodiment, can clearly present.The direction term of mentioning in following examples such as: upper and lower, left and right, front or rear etc., only is direction with reference to the accompanying drawings.Therefore, the direction term of use is to illustrate not to be to limit the present invention.
Fig. 3 is the schematic side view according to the liquid crystal display of one embodiment of the invention, and Fig. 4 is the schematic top plan view of the partial component of the backlight module among Fig. 3.With reference to figure 3 and Fig. 4, liquid crystal display 10 comprises display panels 20 and backlight module 30.Backlight module 30 for example is side light-entering type backlight module (side type backlight module), its side that is disposed at display panels 20 to be providing display panels 20 required area source, and comprises light guide plate 32 and at least one pointolite 34.In the present embodiment, light guide plate 32 is Wedge shape light conduction board, but it does not limit, and for example also can be plate light guide plate.Moreover pointolite 34 for example can be light emitting diode (light emitting diode, LED).
Fig. 6 and Fig. 7 are schematic diagram, illustrate the effect of microstructure 44 on side 325,326 is set.As shown in Figure 6, the side direction light beam R of the microstructure 42 by incidence surface 321 has larger deviation angle, when the side direction light beam R of wide-angle is incident to the light guide plate side, easily reflects light guide plate and forms the side bright spot.Yet, as shown in Figure 7, the side 325,326 of light guide plate has microstructure 44, when the side direction light beam T that is had wide-angle by microstructure 42 deviations is incident to the light guide plate side, side direction light beam T will satisfy total reflection condition when meeting with the first inclined-plane S1 of microstructure 44 and be reflected back toward in the light guide plate, so can effectively avoid side direction light beam T to reflect light guide plate and form the situation of side bright spot, and side direction light beam T can be reflected back light guide plate and can improve the light utilization ratio.
Although the cylinder P of above-described embodiment is that prism and reflecting surface S1 are clinoplane, it does not limit.As shown in Figure 8, the reflecting surface of cylinder P can be the from the side cambered surface S3 of 325,326 projections, when the side direction light beam that is had wide-angle by microstructure 42 deviations is incident to the light guide plate side, will satisfies total reflection condition during side direction beam encounters cambered surface S3 and be reflected back toward in the light guide plate.Moreover, the arrangement form of microstructure 44 on side 325,326 do not limit, for example cylinder P can be on side 325,326 continuous arrangement (Fig. 4), perhaps be arranged in per two adjacent cylinder P on the side 325,326 and can not link to each other and have spacing IN (Fig. 9).In addition, the cylinder P that consists of microstructure 44 can utilize the cut mode, directly cuts the light guide plate side and forms.
With reference to figure 3, backlight module 30 can also comprise reflector plate (reflective sheet) 36 and optical diaphragm group (optical film set) 38 again.Reflector plate 36 is disposed on the bottom surface of light guide plate 323, and optical diaphragm group 38 is disposed on the light guide plate exiting surface 322, and between display panels 20 and light guide plate 32.Optical diaphragm group 38 comprise diffuser plate (diffusion plate), prismatic lens (prism plate) or bright enhancement film (brightness enhanced film, BEF) at least one of them.Reflector plate 36 is used for penetrating the beam reflection of light guide plate 32 and returns light guide plate 32, so that light beam is by exiting surface 322 outgoing, and the required area source of formation display panels 20.Optical diaphragm group 38 is used for will be by the area source homogenising (homogenize) of exiting surface 322 outgoing, and the brightness that can be used for improving area source.
Although the present invention with preferred embodiment openly as above; so it is not to limit the present invention, any those skilled in the art, without departing from the spirit and scope of the invention; when can making various modifications and variations, so protection scope of the present invention should be as the criterion with the scope of appended claims.In addition, arbitrary embodiment of the present invention or claim must not reached whole purpose disclosed in this invention or advantage or characteristics.In addition, summary part and title only are auxiliary patent document search, are not to limit interest field of the present invention.
Claims (13)
1. backlight module comprises:
At least one pointolite; And
Light guide plate comprises:
Exiting surface;
The bottom surface is with respect to described exiting surface;
Incidence surface connects described exiting surface and described bottom surface, and wherein said pointolite is disposed at the position of contiguous described incidence surface;
The first microstructure is formed at described incidence surface;
The first side with respect to described incidence surface, and connects described exiting surface and described bottom surface;
The second side connects described exiting surface, described bottom surface, described incidence surface and described the first side; And
The second microstructure is formed at described the second side, returns in the described light guide plate for the beam reflection that will be incident in described the second microstructure,
Wherein said the second microstructure comprises a plurality of cylinders from described the second side extending projection, and wherein each described cylinder has the first inclined-plane and connects second inclined-plane on described the first inclined-plane, described the first inclined-plane than described the second inclined-plane more near described incidence surface, and the length on described the first inclined-plane is greater than the length on described the second inclined-plane
The angle of wherein said the first inclined-plane and described the second side is more than or equal to 10 degree and is less than or equal to 30 degree.
2. backlight module according to claim 1, wherein each described cylinder orthogonal projection in the length of described the second side for more than or equal to 100 microns and be less than or equal to 400 microns.
3. backlight module according to claim 1, wherein each described cylinder has cambered surface, and the beam reflection that described cambered surface is used for being incident in described cambered surface is returned in the described light guide plate.
4. backlight module according to claim 1, wherein said a plurality of cylinders are at described the second side continuous arrangement.
5. backlight module according to claim 1 wherein has a spacing between per two adjacent described cylinders.
6. backlight module according to claim 1, wherein said pointolite is light emitting diode.
7. liquid crystal display comprises:
Display panels; And
Backlight module is disposed at a side of described display panels, is used for providing described display panels required area source, and wherein said backlight module comprises:
At least one pointolite; And
Light guide plate comprises:
Exiting surface;
The bottom surface is with respect to described exiting surface;
Incidence surface connects described exiting surface and described bottom surface, and wherein said pointolite is disposed at the position of contiguous described incidence surface;
The first microstructure is formed at described incidence surface;
The first side with respect to described incidence surface, and connects described exiting surface and described bottom surface;
The second side connects described exiting surface, described bottom surface, described incidence surface and described the first side; And
The second microstructure is formed at described the second side, returns in the described light guide plate for the beam reflection that will be incident in described the second microstructure,
Wherein said the second microstructure comprises a plurality of cylinders from described the second side extending projection, and wherein each described cylinder has the first inclined-plane and connects second inclined-plane on described the first inclined-plane, described the first inclined-plane than described the second inclined-plane more near described incidence surface, and the length on described the first inclined-plane is greater than the length on described the second inclined-plane
The angle of wherein said the first inclined-plane and described the second side is more than or equal to 10 degree and is less than or equal to 30 degree.
8. liquid crystal display according to claim 7, wherein each described cylinder orthogonal projection in the length of described the second side for more than or equal to 100 microns and be less than or equal to 400 microns.
9. liquid crystal display according to claim 7, wherein each described cylinder has cambered surface, and the beam reflection that described cambered surface is used for being incident in described cambered surface is returned in the described light guide plate.
10. liquid crystal display according to claim 7, wherein said a plurality of cylinders are at described the second side continuous arrangement.
11. liquid crystal display according to claim 7 wherein has a spacing between per two adjacent described cylinders.
12. liquid crystal display according to claim 7, wherein said pointolite are light emitting diode.
13. liquid crystal display according to claim 7, wherein said light guide plate are Wedge shape light conduction board or plate light guide plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810176745 CN101737725B (en) | 2008-11-20 | 2008-11-20 | Backlight module and liquid crystal display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810176745 CN101737725B (en) | 2008-11-20 | 2008-11-20 | Backlight module and liquid crystal display |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101737725A CN101737725A (en) | 2010-06-16 |
| CN101737725B true CN101737725B (en) | 2013-03-06 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200810176745 Expired - Fee Related CN101737725B (en) | 2008-11-20 | 2008-11-20 | Backlight module and liquid crystal display |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101737725B (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI413834B (en) * | 2010-07-22 | 2013-11-01 | Global Lighting Technolog Inc | Backlight module and liquid crystal display |
| CN101852375B (en) * | 2010-06-18 | 2011-09-07 | 苏州向隆塑胶有限公司 | Back light module and liquid crystal display device thereof |
| CN102032529A (en) * | 2010-10-25 | 2011-04-27 | 苏州向隆塑胶有限公司 | Light-guiding assembly |
| WO2014017346A1 (en) * | 2012-07-24 | 2014-01-30 | シャープ株式会社 | Display device, and television receiver |
| CN104315407A (en) * | 2014-10-13 | 2015-01-28 | 京东方科技集团股份有限公司 | Backlight module and display device |
| CN104330920A (en) * | 2014-11-07 | 2015-02-04 | 深圳市华星光电技术有限公司 | Light guide plate and backlight module with same |
| CN106292056A (en) | 2015-06-09 | 2017-01-04 | 瑞仪光电(苏州)有限公司 | Backlight module |
| CN105759335B (en) * | 2015-12-18 | 2019-07-05 | 上海天马微电子有限公司 | Light guide plate, backlight module and display device |
| CN111458925A (en) * | 2019-01-18 | 2020-07-28 | 中强光电股份有限公司 | Light source module and display device |
| CN112764150A (en) * | 2019-10-21 | 2021-05-07 | 元太科技工业股份有限公司 | Front light module and display device |
| CN112788422A (en) * | 2019-11-04 | 2021-05-11 | 海信视像科技股份有限公司 | Display device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002260427A (en) * | 2001-03-05 | 2002-09-13 | Olympus Optical Co Ltd | Lighting device |
| JP2004319228A (en) * | 2003-04-15 | 2004-11-11 | Fujitsu Kasei Kk | Surface lighting system, and liquid crystal display device |
| JP2005285704A (en) * | 2004-03-31 | 2005-10-13 | Citizen Watch Co Ltd | Translucent member and lighting system using it |
| CN1914460A (en) * | 2004-01-29 | 2007-02-14 | 三菱丽阳株式会社 | Surface light source unit-use light guide and production method therefor and surface light source unit |
-
2008
- 2008-11-20 CN CN 200810176745 patent/CN101737725B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002260427A (en) * | 2001-03-05 | 2002-09-13 | Olympus Optical Co Ltd | Lighting device |
| JP2004319228A (en) * | 2003-04-15 | 2004-11-11 | Fujitsu Kasei Kk | Surface lighting system, and liquid crystal display device |
| CN1914460A (en) * | 2004-01-29 | 2007-02-14 | 三菱丽阳株式会社 | Surface light source unit-use light guide and production method therefor and surface light source unit |
| JP2005285704A (en) * | 2004-03-31 | 2005-10-13 | Citizen Watch Co Ltd | Translucent member and lighting system using it |
Non-Patent Citations (1)
| Title |
|---|
| JP特开2004-134223A 2004.04.30 |
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| Publication number | Publication date |
|---|---|
| CN101737725A (en) | 2010-06-16 |
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Granted publication date: 20130306 Termination date: 20131120 |