CN2638098Y - Back light module and liquid crystal display - Google Patents
Back light module and liquid crystal display Download PDFInfo
- Publication number
- CN2638098Y CN2638098Y CN 03247707 CN03247707U CN2638098Y CN 2638098 Y CN2638098 Y CN 2638098Y CN 03247707 CN03247707 CN 03247707 CN 03247707 U CN03247707 U CN 03247707U CN 2638098 Y CN2638098 Y CN 2638098Y
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- CN
- China
- Prior art keywords
- light
- guide plate
- module backlight
- light guide
- liquid crystal
- 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.)
- Expired - Lifetime
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- Planar Illumination Modules (AREA)
- Light Guides In General And Applications Therefor (AREA)
Abstract
A liquid crystal display contains a liquid crystal faceplate and a backlight module that is positioned at the back of the liquid crystal faceplate and comprises a light guide plate and a plurality of point light sources. The light guide plate contains a light entering surface and a light extraction surface that are mutually connected; the point light sources are arranged opposite to the light entering surface. As the light entering surface is provided with a plurality of scattering cavities, the light generated by the light sources is provided with a comparatively large divergence angle to reduce diazone after the light enters into the light guide plate.
Description
[technical field]
The utility model is about a kind of module backlight and adopts the LCD of this module backlight.
[background technology]
Because advantages such as LCD has gently, approaches, power consumption is little are widely used in modernized information equipments such as notebook computer, mobile phone, personal digital assistant.Because liquid crystal itself does not have the characteristics of luminescence, being required to be it provides module backlight to realize Presentation Function.
Existing module backlight comprises light source and light guide plate, and light source is the incidence surface setting of relative light guide plate, and the transmission direction that this light-guide plate guides is sent light beam from light source converts line source or pointolite to the area source outgoing.A plurality of sites that distribute, the bottom surface of this light guide plate are used for broken beam at the total reflection condition of light guide plate internal transmission, and make its scattering improve the homogeneity of light guide plate outgoing beam, and then promote the overall performance of module backlight.The density of this site, size all can have different designs to adapt to different modules backlight.The pointolite that module backlight mainly uses is LED (Light Emitting Diode, light emitting diode) light source, and the emergent ray of LED pointolite has stronger optical directability, and the angle of divergence of its emergent ray is about 30 to 130 degree.
Fig. 1 is for adopting the module incident ray distribution schematic diagram backlight of LED pointolite, and a plurality of LED pointolites (figure does not show) are arranged on light guide plate 3 one sides.Light enters light guide plate 3 from a plurality of LED pointolite incidence points 2, because incident beam has certain angle of divergence, makes light guide plate 3 light inlet sides optics dark space 32 occur, and this optics dark space 32 mainly is distributed between the adjacent LED pointolite incidence point 2.
Seeing also Fig. 2, is a kind of module backlight that reduces light guide plate incident dark space that the TaiWan, China patent of on January 21st, 2002 bulletin discloses for the 530th, No. 919.This module backlight is provided with a plurality of potholes 10 on light guide plate 30, these a plurality of potholes 10 are arranged and are arranged on LED pointolite incidence point 20 dead aheads.Each LED pointolite incidence point 20 the place ahead is arranged with a plurality of potholes 10 of a group respectively, these a plurality of potholes 10 can run through light guide plate 30, when touching pothole 10 outer rims, incident ray produces anaclasis or light total reflection effect, it can destroy the stronger optical directability of LED pointolite and increase the light dispersion angle, helps to improve the defective that there is the dark space in light guide plate 30 light incident sides.
But this pothole 10 is arranged and is located near light guide plate 30 incidence surfaces, the light total reflection effect that incident ray contacts its surface generation makes the incident light that has partly entered light guide plate 30 be reflected, tail off towards the light guide plate 30 inner light quantities that continue transmission, reduce light utilization efficiency and module emitting brightness backlight; And these a plurality of potholes 10 are formed on light guide plate 30 inside, and light makes the light ray energy loss of inciding light guide plate inside in the refraction on pothole 10 surfaces with reflection; In addition, pothole 10 refractive indexes are different with the refractive index of light guide plate 30, hinder the deep transmission of incident ray, incidence point is stronger by the less regional light intensity that pothole 10 surrounds, other bigger zone is because factors such as the obstruction of the minimizing of incident light energy, pothole 10 and scattared energy losses, make be transferred to this big zone light intensity a little less than, influence the uniformity coefficient and the brightness of light guide plate bright dipping.
[utility model content]
For all not high defective of light beam utilization factor, outgoing light homogeneity and brightness that overcomes prior art module backlight, the utility model provides a kind of module backlight with higher light beam utilization factor, outgoing light homogeneity and brightness.
The utility model also provides a kind of LCD that adopts above-mentioned module backlight.
The technical scheme that the utility model technical solution problem is adopted is: a kind of module backlight is provided, it comprises a light guide plate and at least one light source, this light guide plate comprises at least one incidence surface, an exiting surface that links to each other with incidence surface and the bottom surface of a relative exiting surface, this at least one light source is oppositely arranged on a side of light guide plate incidence surface, wherein, this light guide plate incidence surface comprises a plurality of scattering cavitys.
LCD of the present utility model comprises that a liquid crystal panel and is arranged on liquid crystal panel module backlight behind, this module backlight comprises a light guide plate and at least one light source, this light guide plate comprises at least one incidence surface, an exiting surface that links to each other with incidence surface and the bottom surface of a relative exiting surface, this at least one light source is oppositely arranged on a side of light guide plate incidence surface, wherein, this light guide plate incidence surface comprises a plurality of scattering cavitys.
Compare with prior art, because the scattering cavity of the utility model module backlight is positioned at the light guide plate light inlet, the light beam that light source sends enters light guide plate with the bigger angle of divergence after this scattering cavity refraction can reduce blanking bar, incident light is at the unglazed total reflection effect of scattering cavity surface, can reduce light energy losses, improve the light beam utilization factor; And in the incident light transmission direction, do not hinder the structure that incident ray deeply transmits in this light guide plate, be beneficial to the transmission of incident ray, thereby improve the brightness and the uniformity coefficient of module backlight and LCD in light guide plate inside.
[description of drawings]
Fig. 1 is the module incident ray distribution schematic diagram backlight that adopts the LED pointolite.
Fig. 2 is the synoptic diagram of prior art module backlight.
Fig. 3 is the stereographic map of the utility model module backlight.
Fig. 4 is the planimetric map of module backlight shown in Figure 3.
Fig. 5 is the network point distribution synoptic diagram of module backlight shown in Figure 3.
Fig. 6 is the scattering cavity optical effect synoptic diagram of module backlight shown in Figure 3.
Fig. 7 is the side view of the utility model LCD.
[embodiment]
Seeing also Fig. 3, is the stereographic map of the utility model module first embodiment backlight.This module 100 backlight comprises at least one light source 110 and a light guide plate 120.This light source 110 is in order to send light beam, and the transmission direction that these light guide plate 120 these light sources 110 of guiding send light beam is converted into the area source outgoing.
This light source 110 is pointolites, and it can be LED or miniature bulb, and can allocate required light source colour and brightness by the LED or the miniature bulb that dispose a plurality of different colours.
See also Fig. 4 and Fig. 5, this light guide plate 120 is plate shaped light guide plate, be to adopt transparent materials such as acryl, glass or polycarbonate to make, exiting surface 122 and and exiting surface 122 opposed bottom surface 123 that it comprises an incidence surface 121, links to each other with incidence surface 121.This incidence surface 121 is in order to receive the light beam that light source 110 sends, to be provided with and light source 110 corresponding a plurality of scattering cavitys 124 on it.These a plurality of scattering cavitys 124 cave inward, and it is arranged on light beam that light source 110 sends in the view field of incidence surface 121, and has a determining deviation between the adjacent scattering cavity 124.This exiting surface 122 can be processed as the uneven surface with certain roughness.The bottom surface 123 of light guide plate 120 is provided with a plurality of sites 127, matches with scattering cavity 124 to improve the brightness and the homogeneity of light guide plate 120 outgoing beams in this site 127.The size of this site 127 is for along increasing progressively away from the direction of incidence surface 121, and it is a spherical shape, also can be cylindric, square, pyramid or other suitable shape.This site 127 can adopt modes such as printing or ejection formation to form.In addition, also can be 123 a plurality of V-type grooves, vaporific flower or the texture of picking be set to substitute these a plurality of sites 127 in the bottom surface.
Fig. 6 is the optical effect synoptic diagram of this scattering cavity 124.This scattering cavity 124 is the triangular pyramid structure, and it comprises a light inlet BCD, three light scattering face ABC, ABD and ACD that are distributed in different azimuth.The light ABC1 that light source 110 sends and ABC2, ABD1 and ABD2, ACD1 and ACD2 enter this diffusing structure via light light inlet BCD, incide face ABC, ABD and ACD respectively, take place to enter in the light guide plate after refraction and the reflection (figure does not show).In terms of existing technologies, the angle of divergence that light beam enters light guide plate 120 increases, thereby reduces the blanking bar area, improves the outgoing light homogeneity of module 100 backlight.And this scattering cavity 124 is arranged on the recessed cavity at light guide plate incidence surface 121 places, can not hinder the light that has incided light guide plate inside and continue deeply to propagate towards light guide plate is inner; In addition, light incides light scattering face ABC, ABD and ACD enters optically denser medium (optical index of light guide plate is about 1.49) by optically thinner medium (optical index of air is 1), according to the anaclasis law, incident light the light total reflection phenomenon can not occur on light scattering face ABC, ABD and ACD, it can improve the utilization factor of incident ray and the outgoing light homogeneity and the brightness of module backlight.
But scattering cavity 124 is not limited to the triangular pyramid structure, adopt other polyhedral structures such as pentahedron structure, hexahedron also can reach identical effect, and scattering cavity 124 also can be provided with continuously.This scattering cavity 124 can be one-body molded with light guide plate 120, also can adopt the V-Cut method to form.In addition, this scattering cavity 124 can be a curved-surface structure, and this curved-surface structure is preferably sphere or ellipsoid structure.
This module backlight also can have other change design, as: this light guide plate can be the wedge shape light guide plate; For making incident light realize colorize, can form a fluorescent layer to allocate required color and brightness at incidence surface; Bottom surface of light guide plate plating reflectance coating is mapped to the light beam of bottom surface with reflection, prevents that light beam from overflowing from the bottom surface, thereby increases the emitting brightness of module backlight; The light guide plate incidence surface is provided with anti-reflective film or anti-reflection film, to increase the light amount of incident.
Seeing also Fig. 7, is the side view of the utility model LCD.This LCD 90 comprises a liquid crystal panel 91 and an aforementioned module 100 backlight.During work, the light beam that light source 110 sends exiting surface 122 from light guide plate 120 after light guide plate 120 converts area source to shines liquid crystal panel 91.In order further to improve the brightness and the uniformity coefficient of outgoing beam, a prism plate 92 and a diffuser plate 93 are set between liquid crystal panel 91 and module backlight 100.For preventing light beam from 123 outgoing of the bottom surface of light guide plate 120, this LCD 90 further comprises the reflecting plate 94 that is positioned at these 123 places, bottom surface.But also can be at these bottom surface 123 plating reflectance coatings (figure does not show) to replace reflecting plate 94.Because the incidence surface 121 of this light guide plate 120 is provided with the scattering cavity 124 of given shape, itself and the improvement that can effectively realize module 100 backlight and LCD 90 whole optical properties cooperating of light source 110.
Claims (10)
1. module backlight, it comprises a light guide plate and at least one light source, this light guide plate comprises at least one incidence surface, an exiting surface that links to each other with incidence surface and the bottom surface of a relative exiting surface, this at least one light source is oppositely arranged on a side of light guide plate incidence surface, it is characterized in that: this light guide plate incidence surface comprises a plurality of scattering cavitys.
2. module backlight as claimed in claim 1 is characterized in that: this scattering cavity is a polyhedral structure.
3. module backlight as claimed in claim 2 is characterized in that: this polyhedral structure is the triangular pyramid structure, has spacing between adjacent triangular pyramid structure.
4. module backlight as claimed in claim 1 is characterized in that: the surface of this scattering cavity is a curved-surface structure.
5. module backlight as claimed in claim 4 is characterized in that: this curved-surface structure is sphere or ellipsoid.
6. module backlight as claimed in claim 1 is characterized in that: this light source is LED or miniature bulb.
7. module backlight as claimed in claim 1 is characterized in that: this scattering cavity is arranged on light beam that light source the sends projection in zone at incidence surface.
8. module backlight as claimed in claim 1 is characterized in that: this bottom surface is provided with the site or the V-shaped groove of a plurality of regular distribution.
9. module backlight as claimed in claim 1 is characterized in that: this bottom surface is coated with reflectance coating.
10. LCD, it comprises that a liquid crystal panel and is arranged on liquid crystal panel module backlight behind, it is characterized in that: this module backlight is any described module backlight in the claim 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03247707 CN2638098Y (en) | 2003-06-23 | 2003-06-23 | Back light module and liquid crystal display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03247707 CN2638098Y (en) | 2003-06-23 | 2003-06-23 | Back light module and liquid crystal display |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2638098Y true CN2638098Y (en) | 2004-09-01 |
Family
ID=34292925
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03247707 Expired - Lifetime CN2638098Y (en) | 2003-06-23 | 2003-06-23 | Back light module and liquid crystal display |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2638098Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1800941B (en) * | 2005-01-06 | 2010-05-12 | 群康科技(深圳)有限公司 | Backlight module assembly |
| WO2013143162A1 (en) * | 2012-03-29 | 2013-10-03 | 深圳市华星光电技术有限公司 | Backlight module and liquid crystal display device |
| CN108613095A (en) * | 2017-01-03 | 2018-10-02 | 联嘉光电股份有限公司 | Light emitting device and vehicle-mounted light emitting device |
-
2003
- 2003-06-23 CN CN 03247707 patent/CN2638098Y/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1800941B (en) * | 2005-01-06 | 2010-05-12 | 群康科技(深圳)有限公司 | Backlight module assembly |
| WO2013143162A1 (en) * | 2012-03-29 | 2013-10-03 | 深圳市华星光电技术有限公司 | Backlight module and liquid crystal display device |
| CN108613095A (en) * | 2017-01-03 | 2018-10-02 | 联嘉光电股份有限公司 | Light emitting device and vehicle-mounted light emitting device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20130623 Granted publication date: 20040901 |