CN100395634C - Backlight module - Google Patents
Backlight module Download PDFInfo
- Publication number
- CN100395634C CN100395634C CNB2004100510532A CN200410051053A CN100395634C CN 100395634 C CN100395634 C CN 100395634C CN B2004100510532 A CNB2004100510532 A CN B2004100510532A CN 200410051053 A CN200410051053 A CN 200410051053A CN 100395634 C CN100395634 C CN 100395634C
- Authority
- CN
- China
- Prior art keywords
- guide plate
- light guide
- catoptron
- module backlight
- pointolite
- 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 - Fee Related
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Abstract
The present invention discloses a backlight module which comprises a point light source, a light guide plate and a micro-mirror surface device, wherein the point light source emits light rays; the light guide plate has a light incident surface; the micro-mirror surface device is provided with a reflector and a drive device which drives the reflector to rotate. The light rays emitted by the point light source are reflected to the light incident surface of the light guide plate with variable angles after projected to the rotary reflector.
Description
[technical field]
The invention relates to a kind of backlight liquid crystal display module that is applied to, particularly about the higher module backlight of a kind of outgoing light homogeneity.
[background technology]
Because the liquid crystal of panel of LCD itself does not have the characteristics of luminescence, thereby, for reaching display effect, need to give the LCD panel that a light-source system is provided, as module backlight, its function is area source abundant to panel of LCD supply brightness and that be evenly distributed.
A kind of module backlight of prior art can be consulted the TaiWan, China patent the 556th of bulletin on October 1st, 2003, No. 972, as shown in Figure 1, this module backlight comprises a plurality of light emitting diodes 3 and a light guide plate 1, after the emergent ray of these a plurality of light emitting diodes 3 enters light guide plate 1 from the incidence surface 11 of light guide plate 1, from its exiting surface 2 outgoing, form an area source by light guide plate 1 transmission back.
But, because light emitting diode 3 has the restriction of irradiating angle θ, its light that sends is after this incidence surface 11 enters light guide plate 1, with light emitting diode 3 is that the center is in bright state over against the area of space in the certain limit of light guide plate 1, between adjacent light emitting diode 3, then produce irradiate light less than dark space Z, this dark space Z can influence the light-emitting uniformity of module backlight, and then influences the display quality of LCD.
[summary of the invention]
For overcoming the not high problem of module outgoing light homogeneity backlight of prior art, the invention provides the higher module backlight of a kind of outgoing light homogeneity.
Module backlight of the present invention comprises a pointolite, one light guide plate and a micro mirror device, this pointolite emits beam, this light guide plate has an incidence surface, this micro mirror device has a catoptron and a drive unit, this drive unit drives this catoptron and rotates, it is to swing repeatedly around a rotating shaft that this catoptron rotates, the ray cast that pointolite sends is behind the catoptron of swing, reflex to the incidence surface of light guide plate with the angle that changes, the hunting frequency of this catoptron satisfies the persistence of vision phenomenon of human eye and plays the time demand of useful effect and the pendulum angle of catoptron makes reflection ray be enough to shine the gamut of the incidence surface of light guide plate.
Compared to prior art, because module backlight of the present invention utilizes a drive unit to drive catoptron and rotates, this catoptron that is rotating can will be reflexed to the incidence surface of light guide plate with the angle that changes by the light of fixed angle incident, and enter light guide plate, when the rotational frequency of catoptron satisfies the persistence of vision phenomenon of human eye, the observer feels that promptly light transmission is all arranged in the light guide plate, thereby reaches module emitting uniform visual effect backlight.
[description of drawings]
Fig. 1 is the floor map of a kind of prior art module backlight.
Fig. 2 is the floor map of the present invention's module backlight.
Fig. 3 is the floor map of the micro mirror device that adopted of the present invention's module backlight.
Fig. 4 is the light path synoptic diagram of the present invention's module backlight.
[embodiment]
As shown in Figure 2, be the floor map of the present invention's module backlight.This module 5 backlight comprises a pointolite 51, a light guide plate 52 and a micro mirror device.
This pointolite 51 is that (Light Emitting Diode, LED), it is in order to emit beam for a light emitting diode.
This light guide plate 52 is plate shaped light guide plate, and it has an incidence surface 521.
With reference to Fig. 3, this micro mirror device has a catoptron 54 and a drive unit 53 together.This drive unit 53 is that (Micro-Electro-Mechanical Systems, MEMS), it comprises a silicon base 534, an insulation course 531, an electrode 532, an electrode 533 and a change-over circuit 535 to a microelectromechanicdevices devices.This drive unit 53 is provided with two supports 542 (figure only show one), and one 541 cooperates with these two supports 542, and this catoptron 54 is arranged on this axle 541.This change-over circuit 535 with change in voltage be applied on one of this electrode 532,533.These catoptron 54 ground connection.By electrostatic adsorption, this drive unit 53 can drive this catoptron 54 and swing repeatedly.
With reference to Fig. 4, when drive unit 53 these catoptrons 54 of driving rotate with high-frequency, after the light 511 that pointolite 51 sends projects the catoptron 54 of rotation, reflex to the incidence surface 521 of light guide plate 52 with the angle that changes together.To be illustrated as example, when catoptron 54 rotates with rotation direction 540, the light 511 that projects on the catoptron 54 with fixed angle is reflected into light 512, this light 512 rotates with rotation direction 510 because of the rotation of catoptron 54 is also corresponding, thereby makes light 512 can shine the gamut of incidence surface 521 in turn.
Certainly, owing to have certain emission angle as the light emitting diode of pointolite 51 itself, the rotational angle of this catoptron 54 can suitably be adjusted, and its each bar light that does not need pointolite 51 to send all shines the gamut of incidence surface 521 in turn.
Compared to prior art, because module backlight 5 of the present invention utilizes drive unit 53 to drive catoptron 54 and rotates, this catoptron that is rotating 54 can will reflex to the incidence surface 521 of light guide plate 52 with the angle that changes with the light 511 of fixed angle incident, and enter light guide plate 52, when the rotational frequency of catoptron 54 satisfies the persistence of vision phenomenon of human eye, the observer feels that promptly light transmission is all arranged in the light guide plate 52, thereby reaches module 5 emitting uniform visual effects backlight.
Module backlight 5 of the present invention can have following other change design, for example:
This pointolite 51 can be the CNT element (Carbon Nano Tubes, CNT);
This pointolite 51 can be laser diode (Laser Diode, LD);
This light guide plate 52 also can be a wedge type light guide plate.
Claims (7)
1. module backlight, comprise a pointolite and a light guide plate, this pointolite is in order to emit beam, this light guide plate has an incidence surface, it is characterized in that: this module backlight further comprises a micro mirror device, this micro mirror device has a catoptron and a drive unit, this drive unit drives this catoptron and rotates, it is to swing repeatedly around a rotating shaft that this catoptron rotates, the ray cast that pointolite sends is behind the catoptron of swing, reflex to the incidence surface of light guide plate with the angle that changes, the hunting frequency of this catoptron satisfies the persistence of vision phenomenon of human eye and plays the time demand of useful effect and the pendulum angle of catoptron makes reflection ray be enough to shine the gamut of the incidence surface of light guide plate.
2. module backlight as claimed in claim 1 is characterized in that: this pointolite is a light emitting diode.
3. module backlight as claimed in claim 1 is characterized in that: this pointolite is the CNT element.
4. module backlight as claimed in claim 1 is characterized in that: this pointolite is a laser diode.
5. module backlight as claimed in claim 1 is characterized in that: the drive unit of this micro mirror device is a microelectromechanicdevices devices.
6. module backlight as claimed in claim 5 is characterized in that: described microelectromechanicdevices devices comprises two supports and the rotating shaft that matches with support, and this catoptron is arranged at rotating shaft.
7. module backlight as claimed in claim 1 is characterized in that: described light guide plate is plate shaped light guide plate or wedge shape light guide plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100510532A CN100395634C (en) | 2004-08-07 | 2004-08-07 | Backlight module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100510532A CN100395634C (en) | 2004-08-07 | 2004-08-07 | Backlight module |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1731253A CN1731253A (en) | 2006-02-08 |
| CN100395634C true CN100395634C (en) | 2008-06-18 |
Family
ID=35963637
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100510532A Expired - Fee Related CN100395634C (en) | 2004-08-07 | 2004-08-07 | Backlight module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100395634C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103062676B (en) * | 2012-11-21 | 2015-03-25 | 京东方科技集团股份有限公司 | Backlight and display device |
| CN104344275A (en) * | 2013-07-25 | 2015-02-11 | 鸿富锦精密工业（深圳）有限公司 | Backlight module and display device |
| CN104865750B (en) * | 2015-06-12 | 2018-08-07 | 深圳市华星光电技术有限公司 | Light valve and display device |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5515198A (en) * | 1993-01-23 | 1996-05-07 | Nippon Sheet Glass Co., Ltd. | Optical active matrix display |
| CN1206218A (en) * | 1997-05-13 | 1999-01-27 | 新型轻工业有限公司 | Video image viewing device and method |
| JPH1124164A (en) * | 1997-07-03 | 1999-01-29 | Randatsuku:Kk | Color liquid crystal projector |
| US20030156310A1 (en) * | 2002-01-23 | 2003-08-21 | Mitsuo Suzuki | Image forming system employing effective optical scan-line control device |
| CN1444395A (en) * | 2002-03-07 | 2003-09-24 | 株式会社日立制作所 | Projection image display equipment |
| CN2607593Y (en) * | 2002-12-20 | 2004-03-24 | 鸿富锦精密工业（深圳）有限公司 | Poor light source |
| CN1492469A (en) * | 2003-09-10 | 2004-04-28 | 西安交通大学 | Carbon nano tube field emission light-emitting tube and its preparing method |
| TW589495B (en) * | 2003-08-19 | 2004-06-01 | Au Optronics Corp | Liquid crystal display |
-
2004
- 2004-08-07 CN CNB2004100510532A patent/CN100395634C/en not_active Expired - Fee Related
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5515198A (en) * | 1993-01-23 | 1996-05-07 | Nippon Sheet Glass Co., Ltd. | Optical active matrix display |
| CN1206218A (en) * | 1997-05-13 | 1999-01-27 | 新型轻工业有限公司 | Video image viewing device and method |
| JPH1124164A (en) * | 1997-07-03 | 1999-01-29 | Randatsuku:Kk | Color liquid crystal projector |
| US20030156310A1 (en) * | 2002-01-23 | 2003-08-21 | Mitsuo Suzuki | Image forming system employing effective optical scan-line control device |
| CN1444395A (en) * | 2002-03-07 | 2003-09-24 | 株式会社日立制作所 | Projection image display equipment |
| CN2607593Y (en) * | 2002-12-20 | 2004-03-24 | 鸿富锦精密工业（深圳）有限公司 | Poor light source |
| TW589495B (en) * | 2003-08-19 | 2004-06-01 | Au Optronics Corp | Liquid crystal display |
| CN1492469A (en) * | 2003-09-10 | 2004-04-28 | 西安交通大学 | Carbon nano tube field emission light-emitting tube and its preparing method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1731253A (en) | 2006-02-08 |
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Legal Events
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080618 Termination date: 20170807 |