CN100437281C - Back light module - Google Patents
Back light module Download PDFInfo
- Publication number
- CN100437281C CN100437281C CNB2005101005408A CN200510100540A CN100437281C CN 100437281 C CN100437281 C CN 100437281C CN B2005101005408 A CNB2005101005408 A CN B2005101005408A CN 200510100540 A CN200510100540 A CN 200510100540A CN 100437281 C CN100437281 C CN 100437281C
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- Prior art keywords
- light
- guide plate
- incidence surface
- light guide
- light source
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Abstract
The invention relates to a backlight module, including a light guide plate and at least a light source, the light guide plate includes an incidence surface that receives light, the light source is set on the incidence surface of the light guide plate, wherein a light-wave conversion device is set on the vertical direction of the connection between the light source and the incidence surface of the light guide plate, the light-wave conversion device can convert the S-wave that comes from the light source into the P-wave.
Description
[technical field]
The invention relates to a kind of module backlight, particularly about a kind of side-light type module backlight.
[background technology]
Because the liquid crystal itself in the panel of LCD is not luminous, thereby, for reaching display effect, need to give the LCD panel that one planar light source device is provided, as module backlight, to realize Presentation Function.
The module backlight of prior art mainly is made up of light source and light guide plate.Wherein, this light source can be arranged on the incidence surface side of this light guide plate.The effect of this light guide plate is the transmission direction of direct light line, and light is evenly penetrated by the exiting surface of light guide plate.
A kind of module backlight of prior art as shown in Figure 1, this module 1 backlight comprises a light guide plate 11 and a plurality of light emitting diode (LED) 12.
This light guide plate 11 is flat boards, and it comprises an incidence surface 111 and one and the exiting surface 112 that intersects of incidence surface 111.These a plurality of light emitting diodes 12 are disposed on incidence surface 111 sides of light guide plate 11.
The light that light emitting diode 12 sends enters light guide plate 11 from incidence surface 111, and changes into uniform surface light source by exiting surface 112 ejaculations.
But, between the two adjacent light emitting diodes 12,, and then, cause the bright dipping of light guide plate inhomogeneous in the light guide plate 11 inner blanking bar districts 13 that form of contiguous incidence surface 111 because of the relation of angle of output light produces an angle.
Seeing also Fig. 2, is that the light that light emitting diode 12 sends enters the synoptic diagram of light guide plate 11 from incidence surface 111.The light that light emitting diode 12 sends according to the polarization state of light wave, can be divided into S ripple and P ripple, and the S ripple is meant the light wave of direction of an electric field perpendicular to the incidence surface 111 of light guide plate 11, and the P ripple is meant that direction of an electric field is parallel to the light wave of the incidence surface 111 of light guide plate 11.
The irradiate light that light emitting diode 12 sends is to incidence surface 111, and when its incident angle was Brewster angle, because the direction of vibration of S ripple and P ripple is vertical mutually, its direction of propagation can change.P ripple all refraction enters light guide plate 11, and part S ripple reflects away at incidence surface 111.Thereby cause the efficiency of light energy utilization to reduce.
[summary of the invention]
For solving the problem that prior art module bright dipping backlight is inhomogeneous, the efficiency of light energy utilization is low, be necessary to provide a kind of module backlight that improves the outgoing light homogeneity and the efficiency of light energy utilization.
A kind of module backlight, it comprises a light guide plate and at least one light source, this light guide plate is a tabular light guide plate, this light guide plate comprises that one receives the incidence surface of light, one intersects in order to the exiting surface of directing light outgoing and one and the exiting surface opposed bottom surface with this incidence surface, this incidence surface is an inclined-plane, the complementary angle of the angle of this incidence surface and bottom surface and the Brewster angle of incidence surface equates, this light source is arranged on light guide plate incidence surface side, on the vertical direction of the incidence surface line of this light source and light guide plate the light wave conversion equipment is set, the S ripple that this light wave conversion equipment can emit beam light source is converted to the P ripple.
Compared to prior art, described module backlight comprises the light wave conversion equipment, this light wave conversion equipment comprises optical phase put-off diaphragm and spectroscope, the light that light source sends can be divided into S ripple and P ripple by spectroscope, this S ripple can change the P ripple into by the optical phase put-off diaphragm, thereby the light that light source sends can all be converted to the P ripple, and the light guide plate of this module backlight is a tabular light guide plate, and this incidence surface is an inclined-plane, the complementary angle of the angle of this incidence surface and bottom surface and the Brewster angle of incidence surface equates, thereby but the light major part that light source sends enters light guide plate, and can avoid the inner blanking bar district that forms of light guide plate of contiguous incidence surface.
[description of drawings]
Fig. 1 is the synoptic diagram of prior art module backlight.
Fig. 2 is the light path synoptic diagram of prior art module backlight.
Fig. 3 is the synoptic diagram of the present invention's module first embodiment backlight.
Fig. 4 is the synoptic diagram of light guide plate among Fig. 3.
Fig. 5 is the synoptic diagram of the present invention's module second embodiment backlight.
[embodiment]
See also Fig. 3 and Fig. 4, Fig. 3 is the synoptic diagram of the present invention's module first embodiment backlight, and Fig. 4 is the synoptic diagram of light guide plate among Fig. 3.This module 3 backlight comprises a light guide plate 31, two light sources 32 and two light wave conversion equipments 33.
This light guide plate 31 comprises that one receives the incidence surface 311 of light, one and incidence surface 311 intersect exiting surfaces 312 in order to the directing light outgoing, one and exiting surface 312 opposed bottom surface 313, wherein, this incidence surface 311 is inclined-planes, and the complementary angle of the Brewster angle of the angle of incidence surface 311 and bottom surface 313 and incidence surface 311 is equated.
This light source 32 is light emitting diodes, and this light source 32 is positioned at incidence surface 311 sides of light guide plate 31, has light wave conversion equipment 33 between this light source 32 and the incidence surface 311.This light wave conversion equipment 33 comprises a catoptron 331, a λ/2 optical phase put-off diaphragms 332 and a spectroscope 333.This catoptron 331, λ/2 optical phase put-off diaphragms 332 and spectroscope 333 are successively set on the vertical direction of light source 32 and incidence surface 311 lines, and wherein, spectroscope 333 is positioned at the dead ahead of light source 32, and catoptron 331 and horizontal direction are miter angle.
The light that light source 32 sends incides spectroscope 333, this moment is according to the polarization state of light wave, this light beam can be divided into S ripple and P ripple, and the S ripple is meant the light wave of direction of an electric field perpendicular to the incidence surface (figure does not show) of spectroscope 333, and the P ripple is meant that direction of an electric field is parallel to the light wave of the incidence surface of spectroscope 333.The P ripple directly sees through spectroscope 333 and incides light guide plate 31 by incidence surface 311, the S ripple reflects towards vertical direction, and make its phase delay λ/2 by λ/2 optical phase put-off diaphragms 332, this moment, the S ripple changed the P ripple into, mirror 331 reflection that is reflected again of this P ripple, and then incide light guide plate 31 by incidence surface 311.In this process, be the effect of the catoptron 331 of 45 degree through over-angle, the effect of pointolite 32 is similar to line source, thereby can avoid the light guide plate 31 inner blanking bar districts that form of contiguous incidence surface 311, and then improves the efficiency of light energy utilization.
As mentioned above, P involves all can incide light guide plate 31 by incidence surface 311 after the S ripple changes the P ripple into, at this moment, because of the complementary angle of the Brewster angle of the angle of the incidence surface 311 of light guide plate 31 and bottom surface 313 and incidence surface 311 equates, the P ripple can all incide light guide plate 31, the light that light source 32 sends can not produce reflection on incidence surface 311 surfaces, thereby improves the efficiency of light energy utilization.
Seeing also Fig. 5, is the synoptic diagram of the present invention's module second embodiment backlight.The backlight film group 3 that is different from first embodiment, the light wave conversion equipment 53 of this module 5 backlight comprise first catoptron 531, a λ/4 optical phase put-off diaphragms 532, a spectroscope 533 and one second catoptron 534.
This first catoptron 531, λ/4 optical phase put-off diaphragms 532, spectroscope 533 and second catoptron 534 are successively set on the vertical direction of light source 32 and incidence surface 311 lines, wherein, spectroscope 533 is positioned at the dead ahead of light source 32, first catoptron 331 and horizontal direction are an angle of 90 degrees, and second catoptron and horizontal direction are miter angle.
The light that light source 52 sends incides spectroscope 533, this moment is according to the polarization state of light wave, this light beam can be divided into S ripple and P ripple, and the S ripple is meant the light wave of direction of an electric field perpendicular to the incidence surface (figure does not show) of spectroscope 533, and the P ripple is meant that direction of an electric field is parallel to the light wave of the incidence surface of spectroscope 533.The P ripple directly sees through spectroscope 533 and incides light guide plate 51 by incidence surface 511, the S ripple reflects towards vertical direction, and make its phase delay λ/4 by λ/4 optical phase put-off diaphragms 532, again by 531 reflections of first catoptron, make its phase delay λ/4 by λ/4 optical phase put-off diaphragms 532 once more, the S ripple passes through λ/4 optical phase put-off diaphragms 532 twice, its phase delay λ/2, this moment, the S ripple changed the P ripple into, this P ripple angle that is reflected again is second catoptrons 534 reflection of 45 degree, and then incides light guide plate 51 by incidence surface 511.In this process, be the effect of the catoptron 534 of 45 degree through over-angle, the effect of pointolite 52 is similar to line source, thereby can avoid the light guide plate 51 inner blanking bar districts that form of contiguous incidence surface 511, and then improves the efficiency of light energy utilization.
Identical with first embodiment, because of the complementary angle of the Brewster angle of the angle of the incidence surface 511 of light guide plate 51 and bottom surface and incidence surface 511 equates.The P ripple can all incide light guide plate 51, and the light that light source 52 sends can not produce reflection on incidence surface 511 surfaces, thereby improves the efficiency of light energy utilization.
Claims (6)
1. module backlight, it comprises a light guide plate and at least one light source, this light guide plate is a tabular light guide plate, this light guide plate comprises that one receives the incidence surface of light, one intersects in order to the exiting surface of directing light outgoing and one and the exiting surface opposed bottom surface with this incidence surface, this light source is arranged on light guide plate incidence surface side, on the vertical direction of this light source and light guide plate incidence surface line the light wave conversion equipment is set, the S ripple that this light wave conversion equipment can emit beam light source is converted to the P ripple, it is characterized in that: this incidence surface is an inclined-plane, and the complementary angle of the angle of this incidence surface and bottom surface and the Brewster angle of incidence surface equates.
2. module backlight as claimed in claim 1, it is characterized in that: this light wave conversion equipment comprises catoptron, optical phase put-off diaphragm and spectroscope, and described catoptron, optical phase put-off diaphragm and spectroscope are successively set on the vertical direction of light source and light guide plate incidence surface line.
3. module backlight as claimed in claim 2 is characterized in that: this optical phase put-off diaphragm is λ/2 optical phase put-off diaphragms.
4. module backlight as claimed in claim 2 is characterized in that: this optical phase put-off diaphragm is λ/4 optical phase put-off diaphragms.
5. module backlight as claimed in claim 2 is characterized in that: this spectroscope is positioned at the dead ahead of light source.
6. module backlight as claimed in claim 1 is characterized in that: this light source is a light emitting diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101005408A CN100437281C (en) | 2005-10-20 | 2005-10-20 | Back light module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101005408A CN100437281C (en) | 2005-10-20 | 2005-10-20 | Back light module |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1952754A CN1952754A (en) | 2007-04-25 |
| CN100437281C true CN100437281C (en) | 2008-11-26 |
Family
ID=38059164
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005101005408A Expired - Fee Related CN100437281C (en) | 2005-10-20 | 2005-10-20 | Back light module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100437281C (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102454915B (en) * | 2010-10-14 | 2014-10-15 | 京东方科技集团股份有限公司 | Backlight module and liquid crystal display (LCD) |
| CN103234152B (en) * | 2013-04-23 | 2015-03-25 | 京东方科技集团股份有限公司 | Backlight device and liquid crystal display device |
| CN103411160B (en) * | 2013-07-26 | 2016-01-20 | 京东方科技集团股份有限公司 | Backlight module and display unit |
| CN103968306A (en) * | 2014-05-27 | 2014-08-06 | 深圳市华星光电技术有限公司 | Backlight module and liquid crystal display |
| CN106033161B (en) * | 2015-02-09 | 2019-10-08 | 苏州优维毕光电科技有限公司 | A kind of smooth orientation device and method |
| CN105676340B (en) * | 2016-02-25 | 2019-12-17 | 福州大学 | Polarization multiplexing light guide structure of composite parabolic reflection micro-collimating lens and implementation method thereof |
| CN105700239A (en) | 2016-04-22 | 2016-06-22 | 深圳市华星光电技术有限公司 | Backlight module and display device |
| CN106405933B (en) | 2016-10-31 | 2019-08-13 | 京东方科技集团股份有限公司 | Backlight module and liquid crystal display device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2178906Y (en) * | 1993-10-16 | 1994-10-05 | 中国大恒公司 | Broad band light polarization state function table |
| JPH0973083A (en) * | 1995-09-05 | 1997-03-18 | Toshiba Corp | Illuminator and liquid crystal display device |
| JPH1010995A (en) * | 1996-06-20 | 1998-01-16 | Fujitsu General Ltd | Liquid crystal projector lighting system |
| JPH1078581A (en) * | 1996-09-05 | 1998-03-24 | Hitachi Ltd | Liquid crystal display device |
| JPH10288778A (en) * | 1997-04-14 | 1998-10-27 | Fujitsu Kasei Kk | Back light unit |
| JP2003015084A (en) * | 2001-06-28 | 2003-01-15 | Nagano Kogaku Kenkyusho:Kk | Polarized light beam source device |
-
2005
- 2005-10-20 CN CNB2005101005408A patent/CN100437281C/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2178906Y (en) * | 1993-10-16 | 1994-10-05 | 中国大恒公司 | Broad band light polarization state function table |
| JPH0973083A (en) * | 1995-09-05 | 1997-03-18 | Toshiba Corp | Illuminator and liquid crystal display device |
| JPH1010995A (en) * | 1996-06-20 | 1998-01-16 | Fujitsu General Ltd | Liquid crystal projector lighting system |
| JPH1078581A (en) * | 1996-09-05 | 1998-03-24 | Hitachi Ltd | Liquid crystal display device |
| JPH10288778A (en) * | 1997-04-14 | 1998-10-27 | Fujitsu Kasei Kk | Back light unit |
| JP2003015084A (en) * | 2001-06-28 | 2003-01-15 | Nagano Kogaku Kenkyusho:Kk | Polarized light beam source device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1952754A (en) | 2007-04-25 |
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Granted publication date: 20081126 Termination date: 20161020 |
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| CF01 | Termination of patent right due to non-payment of annual fee |