CN100483204C - Light guide plate and back light module - Google Patents
Light guide plate and back light module Download PDFInfo
- Publication number
- CN100483204C CN100483204C CNB2004100269423A CN200410026942A CN100483204C CN 100483204 C CN100483204 C CN 100483204C CN B2004100269423 A CNB2004100269423 A CN B2004100269423A CN 200410026942 A CN200410026942 A CN 200410026942A CN 100483204 C CN100483204 C CN 100483204C
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- Prior art keywords
- guide plate
- light
- light guide
- substrate
- triangular prism
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- Light Guides In General And Applications Therefor (AREA)
- Planar Illumination Modules (AREA)
Abstract
The light guide plate for LCD device includes one substrate, one triangular prism and one converging lens. The substrate includes one light outgoing plane and one bottom plane opposite to the light outgoing plane. The triangular prism includes incident prism plane in the light incoming side and is formed integrally with one end of the substrate. The converging lens is set on the incident prism plane. The light guide plate of the present invention has high light coupling efficiency and homogeneous outgoing light brightness.
Description
[technical field]
The invention relates to a kind of light guide plate that is used for liquid crystal indicator.
[background technology]
Because liquid crystal indicator has advantages such as frivolous, little power consumption, radiation are low, is widely used in electronic equipments such as notebook computer, mobile phone, digital camera, electronic dictionary.Along with the continuous development of lcd technology and people's demand, the brightness uniformity of liquid crystal indicator is had higher requirement in recent years.
A kind of prior art module backlight as shown in Figure 1, this module 100 backlight comprises a light guide plate 10, a light source 11, a light source cover 12 and a reflector plate 13, this light guide plate 10 comprises an incidence surface 14, an exiting surface 15 and a bottom surface 16, this bottom surface 16 is reflectings surface, this reflector plate 13 is arranged at this bottom surface 16 1 sides, and this light source 11 is arranged in the light source cover 12 of incidence surface 14 1 sides of this light guide plate 10.
There is following defective in this module 100 backlight, one: because light guide plate 10 is thin plates, diameter with respect to light source 11, light guide plate 10 narrow incidence surfaces 14 only can make light source 11 towards entering than small part light that light guide plate 10 1 sides are directly sent, other light then needs once just can enter light guide plate 10 through light source cover 12 reflections at least, and it is lower to cause light guide plate 10 coupling light sources 11 to send the efficient of light; Its two: the light angle difference that this light source 11 sends, the light that exceeds certain angle incident light guide plate 10 can form bright spot, thereby cause the brightness irregularities of this module 100 backlight directly from exiting surface 15 outgoing of contiguous incidence surface 14.
[summary of the invention]
In order to overcome the problem of the low and brightness irregularities of prior art light guide plate coupling efficiency, the invention provides a kind of coupling efficiency height and even brightness light guide plate.
The technical scheme that technical solution problem of the present invention is adopted is: a kind of light guide plate is provided, this light guide plate comprises a substrate, one triangular prism and one is assembled lens, this substrate comprises an exiting surface and a bottom surface, this bottom surface and this exiting surface are oppositely arranged, this triangular prism and this substrate one end are one-body molded, this convergent lens is arranged on this triangular prism, this triangular prism comprises first reflecting surface, second reflecting surface and the entrance prism face that is positioned at light inlet side, this convergent lens is outstanding to be arranged on this entrance prism face, light behind this convergent lens by this first reflecting surface, enter this substrate after the reflection of second reflecting surface, this triangular prism, this entrance prism face and this exiting surface are overlapped.
Compare with prior art, the invention has the beneficial effects as follows: the convergent lens coupling area of light guide plate of the present invention is bigger, so its coupling efficiency height; Light guide plate of the present invention is converted to collimated light with the light that light source sends through this convergent lens, and this collimated light enters this substrate through this triangular prism again, conducts in this substrate, finally evenly penetrates from exiting surface, makes the emitting brightness of this light guide plate even.
[description of drawings]
Fig. 1 is the synoptic diagram of a kind of prior art module backlight.
Fig. 2 is the schematic perspective view of light guide plate first embodiment of the present invention.
Fig. 3 is the synoptic diagram of light guide plate second embodiment of the present invention.
Fig. 4 is the synoptic diagram of light guide plate the 3rd embodiment of the present invention.
Fig. 5 is the synoptic diagram of light guide plate the 4th embodiment of the present invention.
Fig. 6 is the synoptic diagram of light guide plate the 5th embodiment of the present invention.
Fig. 7 is the synoptic diagram of the present invention's module first embodiment backlight.
Fig. 8 is the synoptic diagram of the present invention's module second embodiment backlight.
Fig. 9 is the synoptic diagram of the present invention's module the 3rd embodiment backlight.
[embodiment]
Seeing also Fig. 2, is the schematic perspective view of light guide plate first embodiment of the present invention.This light guide plate 20 comprises a substrate 21, a triangular prism 22 and convergence lens 23, this substrate 21 comprises an exiting surface 211 and a bottom surface 212, this bottom surface 212 is oppositely arranged with this exiting surface 211, this light guide plate 20 also comprises a triangular prism 22 and convergence lens 23, this triangular prism 22 comprises the entrance prism face that is positioned at light inlet side, this triangular prism 22 is one-body molded with these substrate 21 1 ends, this convergent lens 23 is half-cylindrical, these convergent lens 23 outstanding being arranged on this entrance prism face 225.This substrate 21, triangular prism 22 and convergent lens 23 are one-body molded.The length of these triangular prism 22 first sides 221 is less than the length of second side 222, and first prism facets 223 at first side 221 and 222 places, second side and second prism facets 224 all be reflectings surface, and the vertex angle theta that form are intersected with second side 222 in first side 221
1It is the obtuse angle.This substrate 21 is flat boards, and this exiting surface 211 comprises a smooth directing mechanism 213, and this light directing mechanism 213 is prism arrays, and this bottom surface 212 is reflectings surface.On two reverse directions, a part of overlaid of the part of this entrance prism face 225 and this exiting surface 211.This convergent lens 23 is outstanding be arranged at this triangular prism 22 the central part of entrance prism face 225 on.
The coupling area of this convergent lens 23 is bigger, so its coupling efficiency height.This light guide plate 20 is converted to collimated light with the light that light source sends through this convergent lens 23, this collimated light is earlier after first prism facets 223 of this triangular prism 22 and the total reflection or the reflection of second prism facets 224, tilt to enter this substrate 21, and the total reflection by this bottom surface 212 or be reflected in conduction in this substrate 21, final light directing mechanism 213 by this exiting surface 211 evenly penetrates from this exiting surface 211, makes the emitting brightness homogenising of this light guide plate 20.
Seeing also Fig. 3, is the synoptic diagram of light guide plate second embodiment of the present invention.This light guide plate 30 is with the difference of the first embodiment light guide plate 20: this convergent lens 33 away from this substrate 31, extends outstanding the setting from a crest line to these substrate 31 directions on the entrance prism face 325 of this triangular prism 32.
Seeing also Fig. 4, is the synoptic diagram of light guide plate the 3rd embodiment of the present invention.This light guide plate 40 is with the difference of the first embodiment light guide plate 20: this convergent lens 43 is on the entrance prism face 425 of this triangular prism 42, and is crossing with an end face of this substrate 41, and to extending outstanding the setting away from the direction of this substrate 41.
Seeing also Fig. 5, is the synoptic diagram of light guide plate the 4th embodiment of the present invention.This light guide plate 50 is with the difference of the first embodiment light guide plate 20: the length of these triangular prism 52 first sides 521 is greater than the length of second side 522, and the vertex angle theta that forms is intersected with second side 522 in first side 521
2Be acute angle, this vertex angle theta
2One end line overlaid of one crest line of relative prism facets and the exiting surface 511 of this substrate 51, this triangular prism 52 and this substrate 51 are positioned at the homonymy of double line, this vertex angle theta
2A part of overlaid of relative prism facets and this exiting surface 511, these convergent lens 53 outstanding being arranged on the entrance prism face at 521 places, first side.The coupling area of this convergent lens 53 is bigger, so its coupling efficiency height.This light guide plate 50 is converted to collimated light with the light that light source sends through this convergent lens 53, this collimated light is in this triangular prism 52 incides this substrate 51, and the total reflection by this bottom surface 512 or be reflected in conduction in this substrate 51, finally the light directing mechanism 513 by this exiting surface 511 makes it evenly penetrate from this exiting surface 511, make the coupling efficiency height of this light guide plate 50, the emitting brightness homogenising.
Seeing also Fig. 6, is the synoptic diagram of light guide plate the 5th embodiment of the present invention.This light guide plate 60 is with the difference of the 4th embodiment light guide plate 50: the length of these triangular prism 62 first sides 621 and the equal in length of second side 622, the vertex angle theta that forms is intersected with second side 622 in first side 621
3Be the right angle, this vertex angle theta
3One end line overlaid of one crest line of relative prism facets and this bottom surface 612, this triangular prism 62 and this substrate 61 are positioned at the homonymy of double line, and this second side 622 is crossing with the exiting surface 611 of this substrate 61.
Seeing also Fig. 7, is the synoptic diagram of the present invention's module first embodiment backlight.This module 700 backlight comprises a light guide plate 70 and a light source 701, this light guide plate 70 comprises a substrate 71, a triangular prism 72 and convergence lens 73, this substrate 71 comprises an exiting surface 711 and a bottom surface 712, this bottom surface 712 is oppositely arranged with this exiting surface 711, this triangular prism 72 comprises the entrance prism face 725 that is positioned at light inlet side, this triangular prism 72 is one-body molded with these substrate 71 1 ends, these convergent lens 73 outstanding being arranged on this entrance prism face 725, this light source 701 is oppositely arranged with this convergent lens 73.
This substrate 71, triangular prism 72 and convergent lens 73 are one-body molded.The length of these triangular prism 72 first sides 721 is less than the length of second side 722, and the digonous minute surface at first side 721 and 722 places, second side all is reflectings surface, and the vertex angle theta that form are intersected with second side 722 in first side 721
4It is the obtuse angle.This substrate 71 is flat boards, and this exiting surface 711 comprises a smooth directing mechanism 713, and this light directing mechanism 713 is prism arrays, and this bottom surface 712 is reflectings surface.This convergent lens 73 is half-cylindrical, on two reverse directions, and a part of overlaid of the part of this exiting surface 711 and this entrance prism face 725.This convergent lens 73 is given prominence on the central part of the entrance prism face that is arranged at this triangular prism 72.These bottom surface 712 1 sides are provided with a reflector plate 702.This light source 701 is light emitting diodes.
Two limits at these light source 701 maximum luminous angles are simultaneously tangent with the cylinder of this convergent lens 73, and the light that light source can be sent all is coupled, so its coupling efficiency height.This light guide plate 70 is converted to collimated light with the light that this light source 701 sends through this convergent lens 73, this collimated light is earlier after the total reflection or the reflection of the digonous minute surface at the first side 721 of this triangular prism 72 and 722 places, second side, tilt to enter this substrate 71, and the total reflection by this bottom surface 712 or be reflected in conduction in this substrate 71, final light directing mechanism 713 by this exiting surface 711 evenly penetrates from this exiting surface 711, makes the emitting brightness homogenising of this light guide plate 70.Thereby make the emitting brightness homogenising of this module 700 backlight.This light guide plate 70 of light reflected back that this reflector plate 702 will spill from this bottom surface 712 improves light utilization efficiency.
Seeing also Fig. 8, is the synoptic diagram of the present invention's module second embodiment backlight.This module 800 backlight is with the difference of first embodiment module 700 backlight: this light source 801 is cold cathode fluorescent lamps, this cold cathode fluorescent lamp is arranged in the light source cover 803, and a reflectance coating 804 is pasted or be coated with to this light source cover 803 and this light source 801 relative one sides.This reflectance coating 804 can reflect the light that this light source 801 sends, and makes it see through this convergent lens 83 and this triangular prism 82 incides in this substrate 81, improves light utilization efficiency.
Seeing also Fig. 9, is the synoptic diagram of the present invention's module the 3rd embodiment backlight.This module 900 backlight is with the difference of first embodiment module 700 backlight: the length of these triangular prism 92 first sides 921 is greater than the length of second side 922, it is acute angles that the vertex angle theta 5 that forms is intersected with second side 922 in first side 921, one end line overlaid of one crest line of the prism facets that this vertex angle theta 5 is relative and the exiting surface 911 of this substrate 91, this triangular prism 92 and this substrate 91 are positioned at the homonymy of double line, this vertex angle theta
5A part of overlaid of relative prism facets and this exiting surface 911.Two limits at these light source 901 maximum luminous angles are simultaneously tangent with the cylinder of this convergent lens 93, and the light that light source can be sent all is coupled, so its coupling efficiency height.The light that the light source that this light guide plate 90 is sent this light source 901 sends is converted to collimated light through this convergent lens 93, this collimated light is in this triangular prism 92 incides this substrate 91, total reflection by this bottom surface 912 or be reflected in conduction in this substrate 91, final light directing mechanism 913 by this exiting surface 911 evenly penetrates from exiting surface 911, makes the emitting brightness homogenising of module 900 backlight.
It is described that light guide plate of the present invention is not limited to present embodiment, also can be semisphere as the convergent lens of this light guide plate, and the light directing mechanism also can be arrays such as circular cone, quadrangular pyramid and hexagonal awl.It is described that module backlight of the present invention is not limited to present embodiment, and this reflector plate and light guide plate also can be laminated together.
Claims (5)
1. light guide plate, comprise a substrate, this substrate comprises an exiting surface and a bottom surface, this bottom surface and this exiting surface are oppositely arranged, it is characterized in that: this light guide plate also comprise one with this one-body molded triangular prism of substrate one end and a convergent lens that is arranged on this triangular prism, this triangular prism comprises first reflecting surface, second reflecting surface and the entrance prism face that is positioned at light inlet side, this convergent lens is outstanding to be arranged on this entrance prism face, light behind this convergent lens by this first reflecting surface, enter this substrate after the reflection of second reflecting surface, this entrance prism face and this exiting surface are overlapped.
2. light guide plate according to claim 1 is characterized in that: this substrate, this triangular prism and this convergent lens are one-body molded.
3. light guide plate according to claim 1 is characterized in that: this first reflecting surface and second reflecting surface all intersect with this exiting surface.
4. light guide plate according to claim 1 is characterized in that: this convergent lens is half round post or semisphere.
5. light guide plate according to claim 1 is characterized in that: this bottom surface is a reflecting surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100269423A CN100483204C (en) | 2004-04-17 | 2004-04-17 | Light guide plate and back light module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100269423A CN100483204C (en) | 2004-04-17 | 2004-04-17 | Light guide plate and back light module |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1683966A CN1683966A (en) | 2005-10-19 |
| CN100483204C true CN100483204C (en) | 2009-04-29 |
Family
ID=35263369
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100269423A Expired - Fee Related CN100483204C (en) | 2004-04-17 | 2004-04-17 | Light guide plate and back light module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100483204C (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100354658C (en) * | 2005-10-20 | 2007-12-12 | 财团法人国家实验研究院国家高速网路与计算中心 | Micro structure of light conductive board |
| US8154689B2 (en) | 2007-04-26 | 2012-04-10 | Sharp Kabushiki Kaisha | Light emitting element and liquid crystal display apparatus |
| TWI477855B (en) * | 2012-01-20 | 2015-03-21 | Au Optronics Corp | Backlight module |
| TW201445221A (en) * | 2013-05-23 | 2014-12-01 | Hon Hai Prec Ind Co Ltd | Light guide plate, backlight module and liquid display device |
| TW201502607A (en) * | 2013-07-04 | 2015-01-16 | Era Optoelectronics Inc | Structure for guiding light into guide light plate to conduct total internal reflection |
| CN104456275A (en) * | 2013-09-22 | 2015-03-25 | 鸿富锦精密工业（深圳）有限公司 | Backlight module |
| CN104656183B (en) | 2015-03-10 | 2017-09-01 | 京东方科技集团股份有限公司 | Light guide plate assembly and display device |
| KR101608963B1 (en) * | 2015-06-19 | 2016-04-04 | (주)코이즈 | Light guide plate having complex pattern and method of manufacturing the same |
| CN106959545A (en) * | 2016-01-08 | 2017-07-18 | 京东方科技集团股份有限公司 | A kind of display panel and display device |
| CN106772771B (en) * | 2017-01-03 | 2019-09-03 | 合肥鑫晟光电科技有限公司 | Light guide plate, backlight module and display device |
| CN107219577B (en) * | 2017-07-31 | 2019-11-22 | 昆山龙腾光电有限公司 | Prism plate and display device |
| CN110058347B (en) * | 2018-01-18 | 2020-05-12 | 京东方科技集团股份有限公司 | Light source module and electronic device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6250767B1 (en) * | 1998-06-22 | 2001-06-26 | Sanyo Electric Co. Ltd. | Light guide plate, surface light source and display using the same |
| US6273577B1 (en) * | 1997-10-31 | 2001-08-14 | Sanyo Electric Co., Ltd. | Light guide plate, surface light source using the light guide plate, and liquid crystal display using the surface light source |
-
2004
- 2004-04-17 CN CNB2004100269423A patent/CN100483204C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6273577B1 (en) * | 1997-10-31 | 2001-08-14 | Sanyo Electric Co., Ltd. | Light guide plate, surface light source using the light guide plate, and liquid crystal display using the surface light source |
| US6250767B1 (en) * | 1998-06-22 | 2001-06-26 | Sanyo Electric Co. Ltd. | Light guide plate, surface light source and display using the same |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1683966A (en) | 2005-10-19 |
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