CN100383622C - Backlight module and liquid crystal display device - Google Patents

Backlight module and liquid crystal display device Download PDF

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Publication number
CN100383622C
CN100383622C CNB021521794A CN02152179A CN100383622C CN 100383622 C CN100383622 C CN 100383622C CN B021521794 A CNB021521794 A CN B021521794A CN 02152179 A CN02152179 A CN 02152179A CN 100383622 C CN100383622 C CN 100383622C
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China
Prior art keywords
light
upwards
light guide
microprism
guide plate
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Expired - Fee Related
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CNB021521794A
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Chinese (zh)
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CN1504804A (en
Inventor
余泰成
吕昌岳
陈杰良
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Hongfujin Precision Industry Shenzhen Co Ltd
Hon Hai Precision Industry Co Ltd
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Hongfujin Precision Industry Shenzhen Co Ltd
Hon Hai Precision Industry Co Ltd
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Priority to CNB021521794A priority Critical patent/CN100383622C/en
Publication of CN1504804A publication Critical patent/CN1504804A/en
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Publication of CN100383622C publication Critical patent/CN100383622C/en
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Abstract

The present invention relates to a liquid crystal display device which comprises a thin film transistor (TFT) glass substrate, a color filter (CF) glass substrate, a plurality of liquid crystal molecules which are arranged between the TFT glass substrate and the CF glass substrate, two polarizing plates which are positioned on both sides of the TFT glass substrate and the CF glass substrate, and a back light module which is arranged on the polarizing plate near the TFT glass substrate. The back light module comprises a light guide plate made of transparent materials, a light source, a light source cover, a 1/4 wave plate, an upward prism plate and a downward prism plate, wherein the upward prism plate is arranged on a light emergent surface of the light guide plate, and one side of the upward prism plate, which does not face the light guide plate, is continuously and uniformly provided with a plurality of upward micro prisms; one side of the upward prism plate, which is provided with micro prisms, is provided with the downward prism plate which comprises a brightening film and a plurality of downward micro prisms which are integrally extended from the brightening film, and the downward micro prisms are meshed with the upward micro prisms.

Description

Module backlight and liquid crystal indicator
[technical field]
The present invention relates to the liquid crystal indicator of this module backlight of a kind of module backlight and a kind of application as backlight.
[background technology]
Present stage, LCD is fast because of its reaction, display quality is good, radiationless, be applicable to advantage such as large-scale animation display, is widely used in notebook, desk-top computer monitor, workstation, industry monitoring device, Global Positioning System (GPS) (GPS), personal data processing, game machine, videophone, portable V CD, DVD and some other mancarried devices.So, liquid crystal itself is not luminous, must have light-source system to provide display image required light for it.
Please see Figure 1, a kind of liquid crystal indicator 10 that is usually used in notebook computer comprises a module 12 backlight, a thin film transistor (TFT) (Thin Film Transistor, TFT) glass substrate 14, a colored filter (Color Filter, CF) glass substrate 16, the liquid crystal molecule 18 between TFT glass substrate 14 and CF glass substrate 16 and the Polarizer 19,19 ' that is positioned the two both sides respectively, and this two Polarizer 19,19 ' vertical mutually setting of optical direction.This module 12 backlight provides required area source for this liquid crystal indicator 10, it comprises a tabular light guide plate 122, be positioned at the light source 124 of light guide plate 122 1 sides and the light source cover 126 that reflection source 124 emergent lights return light guide plate 122, be provided with a series of sites (figure does not show) in light guide plate 122 bottom surfaces, so that the light source emergent light is from the even outgoing of light guide plate 122 exit facets.
Light source 124 emergent lights are natural light, it is made of jointly polarization direction orthogonal P direction polarized light and S direction polarized light, when this natural light is coupled out when being incident upon Polarizer 19 through light guide plate 122, because Polarizer 19 only allows the polarization direction partial poolarized light parallel with its optical direction to pass through, the then whole absorption losss of partial poolarized light that the polarization direction is vertical with its optical direction, even do not consider the loss in the transmission course in light source cover 126 and light guide plate 122 of light source 124 emergent lights, because the absorption of Polarizer 19, have at least 50% luminous energy to be depleted, add the absorption loss of above-mentioned transmission course and TFT glass substrate 14 and CF glass substrate 16, the efficiency of light energy utilization of entire liquid crystal display device 10 only 10% less than, briliancy is also had a greatly reduced quality.
[summary of the invention]
For solving the module efficiency of light energy utilization backlight and the low defective of briliancy in the background technology, the invention provides the high module backlight of a kind of efficiency of light energy utilization and briliancy.
For solving the liquid crystal indicator efficiency of light energy utilization and the low defective of briliancy in the background technology, the present invention also provides a kind of efficiency of light energy utilization and high liquid crystal indicator of briliancy of using above-mentioned module backlight as area source.
The technical scheme of technical solution problem of the present invention is: a kind of module backlight is provided, and it comprises a light guide plate of being made by transparent material, a light source, a light source cover, a quarter wave plate, upwards a prism plate and a downward prism plate.This light guide plate comprises a light entrance face and one and the light-emitting face that intersects of light entrance face; This light source is positioned at light guide plate light entrance face one side; This light source cover reflection source emergent light is gone into this light guide plate; Upwards prism plate is arranged at light guide plate light-emitting face one side, and its face away from light guide one side surface evenly is provided with a plurality of upwards microprisms continuously; This downward prism plate is positioned at upwards prism plate microprism one side, it comprises a brightness enhancement film (BrightnessEnhanced Film, BEF) and an a plurality of downward microprism that extends from the brightness enhancement film one, its with a plurality of make progress that microprism is meshing with each other and its drift angle respectively between 125 ° to 145 °.
Liquid crystal indicator of the present invention comprises a thin film transistor (TFT) (Thin Film Transistor, TFT) glass substrate, a colored filter (Color Filter, CF) liquid crystal molecule, two between glass substrate, a plurality of TFT of being positioned at glass substrate and CF glass substrate is positioned the Polarizer of TFT glass substrate and CF glass substrate both sides respectively, the optical direction of this two Polarizer is vertical mutually to be provided with, and the module backlight of contiguous TFT glass substrate one a lateral deviation tabula rasa setting.This module backlight comprises a light guide plate of being made by transparent material, a light source, a quarter wave plate, upwards a prism plate and a downward prism plate.This light guide plate comprises a light entrance face and one and the light-emitting face that intersects of light entrance face; This light source is positioned at light guide plate light entrance face one side; Upwards prism plate is arranged at light guide plate light-emitting face one side, and its face away from light guide one side surface evenly is provided with a plurality of upwards microprisms continuously; This downward prism plate is positioned at upwards prism plate microprism one side, and it comprises a plurality of downward microprism that a brightness enhancement film and is extended from the brightness enhancement film one, its and this a plurality of make progress that microprisms are meshing with each other and its drift angle respectively between 125 ° to 145 °.
The present invention utilize a plurality of upwards, microprism is converted into the complete linearly polarized light of P direction and the complete linearly polarized light of S direction with natural light downwards, and the complete linearly polarized light of P direction is directly from prism plate transmission downwards, and the complete linearly polarized light of S direction is converted into the complete linearly polarized light of P direction for twice fully from prism plate outgoing downwards through quarter wave plate, light source 100% is utilized, and the complete linearly polarized light of two groups of P directions converges through the anti-reflection film outgoing, further improves the outgoing briliancy of module backlight and liquid crystal indicator.
[description of drawings]
The present invention is further described below in conjunction with drawings and embodiments.
Fig. 1 is the sectional view of background technology liquid crystal indicator;
Fig. 2 is the sectional view of the present invention's module backlight;
Fig. 3 is natural light is entered into another kind of index medium by a kind of index medium a light path synoptic diagram;
Fig. 4 is the sectional view of liquid crystal indicator of the present invention.
[embodiment]
Please see Figure 2, the module backlight 20 of embodiment of the present invention comprises a light guide plate of being made by transparent material 22, a light source 24, a light source cover 25, a quarter wave plate 23, upwards a prism plate 26 and a downward prism plate 28.Light guide plate 22 comprises a light entrance face 221 and one and light entrance face 221 light-emitting face 222 and bottom surface 223 that intersect, light source 24 is positioned at light guide plate 22 light entrance faces 221 1 sides, light source cover 25 reflection sources 24 emergent lights are gone into this light guide plate 22, upwards prism plate 26 is arranged on light guide plate 22 light-emitting faces 222, prism plate 28 is positioned at upwards prism plate 26 face away from light guide 22 1 sides downwards, quarter wave plate 23 is arranged at bottom surface 223 1 sides of light guide plate 22, and its face away from light guide 22 1 side bottom surfaces 232 are coated with reflectance coating.
Light guide plate 22 roughly becomes a rectangular parallelepiped, this light entrance face 221 is perpendicular to bottom surface 223 and light-emitting face 222, and further comprise first side (figure do not show), with first side second side surface opposite (scheming not show) and three side 226 relative with the plane of incidence 222, for making light from exit facet 222 even outgoing, usually 223 be provided with a plurality of sites (figure do not show) in the bottom surface, can there be the distribution of multiple kenel this site, and, be coated with anti-reflective film to reduce the absorption loss of luminous energy in this plane of incidence 221 and exit facet 222 for improving the light utilization ratio.Light guide plate 22 and this light source 24 and the angled setting of combination of light sources that light source cover 25 constitutes, make the combination of light sources outgoing to the directional light of light guide plate 22 with predetermined direction and position from 222 outgoing of light guide plate 22 exit facets.Usually, this light guide plate also can be a sphenoid, and to be that its bottom surface and the plane of incidence acutangulate crossing with rectangular parallelepiped light guide plate difference.
Upwards prism plate 26 face away from light guide 22 1 side surfaces evenly are provided with a plurality of upwards microprisms 262 continuously, this downward prism plate 28 comprises a brightness enhancement film 284 and an a plurality of downward microprism 282 from the extension of brightness enhancement film 284 one, and be meshing with each other with a plurality of upwards microprisms 262, be reserved with certain intervals 29 between the surface 263,283 relatively for 262,282 liang in these a plurality of upwards, downward microprisms, these are a plurality of upwards, the bottom side length of microprism 262,282 is 450 to 550 microns downwards, and height is 200 to 250 microns.Certainly, light guide plate 22 size differences, it is different that this bottom side length and high design also have, and decides on specific requirement.
Please see Figure 3, when unpolarized natural light from a kind of index medium n 0Enter into another kind of index medium n 1The time, reflection of light and refraction will take place in faying face simultaneously that join at two kinds of materials, suppose that incident angle is θ 0, the refraction angle is θ 1, the incident medium refractive index is n 0, the emergent medium refractive index is n 1, the light intensity reflectivity of P direction polarized light and S direction polarized light is respectively R in the reflected light p, R s, R then p, R sCan use following formulate respectively:
R p＝{n 1/cosθ 0-n 0/cosθ 1} 2/{n 1/cosθ 0+n 0/cosθ 1} 2
Rs＝{n 0/cosθ 0-n 1/cosθ 1} 2/{n 0/cosθ 0+n 1/cosθ 1} 2
Can draw, along with incident angle θ 0Increase, the light intensity reflectivity R of S direction polarized light sTotal dull rising, and the light intensity reflectivity R of P direction polarized light pDescended before this, at incident angle θ 0Arrive a certain special angle θ BThe time, P direction polarized light reflectivity is reduced to zero, this incident angle θ BBe called as Brewster angle, can derive draws θ BExpression formula be:
θ B＝tan -1n 0/n 1
So, when natural light with Brewster angle θ BDuring incident, reflected light is the complete linearly polarized light of S direction always, and for refract light, includes P direction polarized light about 92% and about 8% S direction polarized light.
Please see Fig. 2 in the lump, for making from light guide plate 22 light-emitting faces 222 emergent lights with Brewster angle θ BBe incident to a plurality of upwards microprisms 263, these are a plurality of upwards, microprism 262,282 drift angles are arranged between 125 ° to 145 ° downwards, are preferably 135 °; A plurality of upwards, downwards microprism 262,282 and therebetween the refringence of 29 of airspaces between 0.001 to 0.2.Thus, when light guide plate 22 emergent lights with Brewster angle θ BFrom these a plurality of upwards microprism 262 outgoing 29 o'clock extremely at interval, reflected light is the complete linearly polarized light of S direction, and refract light is the partial poolarized light of P direction, again by 29 outgoing at interval to these a plurality of downward microprisms 282, S direction polarized light is continued reflection, and P direction polarized light is continued refraction, at this moment, it is just very faint to arrive in the light beam of downward prism plate 28 S direction polarized light, is almost the complete linearly polarized light of 100%P direction.By a plurality of upwards, the S direction polarized light of microprism 262,282 reflections downwards is incident to quarter wave plate 23 through light guide plate 22, via quarter wave plate 23 bottom surfaces 232 reflected back quarter wave plates, S direction polarized light passes through quarter wave plate 23 twice, its polarization direction is rotated by 90 degrees and becomes complete polarized light reflected back light guide plate 22 on the P direction, via light guide plate 22 again outgoing to prism plate 26 upwards and prism plate 28 downwards, the P direction polarized light of this bundle reflected back and the aforementioned P direction polarized light combination that reflects provide liquid crystal indicator required bright area source by brightness enhancement film 284.
Please see Figure 4, liquid crystal indicator 30 of the present invention comprises a thin film transistor (TFT) (Thin Film Transistor, TFT) glass substrate 32, a colored filter (Color Filter, CF) liquid crystal molecule 34, two of 33 of glass substrate 33, a plurality of TFT of being positioned at glass substrate 32 and CF glass substrates is positioned the Polarizer 35,35 ' of TFT glass substrate 32 and CF glass substrate 33 both sides respectively, this two Polarizer 35,35 ' vertical mutually setting of optical direction, and the module backlight 20 that is provided with of contiguous TFT glass substrate 32 1 lateral deviation tabula rasas 35.
In the embodiment of the present invention, these are a plurality of upwards, 262,282 of microprisms can not keep interval 29 downwards, and refringence is arranged between 0.001 to 0.2 therebetween, light guide plate 22 emergent lights directly enter a plurality of downward microprisms 282 via these a plurality of upwards microprisms 262, P direction polarized light is refracted, S direction polarized light is reflected, and be converted to P direction polarized light via quarter wave plate 23 and enter a plurality of downward microprisms 282, therefore, also can provide the high efficiency efficiency of light energy utilization, improve the briliancy of liquid crystal indicator 30, realize the technical matters that the present invention solves.
The present invention utilizes upper and lower a plurality of microprism 262,282 that natural light is converted into the complete linearly polarized light of P direction and the complete linearly polarized light of S direction, and the complete linearly polarized light of P direction is directly from prism plate 28 transmissions downwards, and the complete linearly polarized light secondary of S direction is converted into the complete linearly polarized light of P direction fully from prism plate 28 outgoing downwards through quarter wave plate 23, light source 100% is utilized, and the complete linearly polarized light of two groups of P directions converges through brightness enhancement film 284 outgoing, has further improved the outgoing briliancy of module backlight and liquid crystal indicator.

Claims (14)

1. module backlight, it comprises: a light guide plate of being made by transparent material, one is positioned at the light source of light guide plate light entrance face one side and the light source cover that a reflection source emergent light is gone into this light guide plate, this light guide plate comprises a light entrance face and one and the light entrance face light-emitting face and the bottom surface of intersecting, it is characterized in that: this module backlight comprises that also one is arranged at the upwards prism plate of light guide plate light-emitting face, its face away from light guide one side surface evenly is provided with a plurality of upwards microprisms continuously, one is positioned at the upwards downward prism plate of prism plate microprism one side, it comprises a brightness enhancement film and an a plurality of downward microprism from the extension of brightness enhancement film one, and the quarter wave plate of a contiguous bottom surface of light guide plate setting, these are a plurality of upwards, downwards microprism be meshing with each other and its drift angle respectively between 125 ° to 145 °.
2. module backlight as claimed in claim 1 is characterized in that these are a plurality of upwards, the drift angle of microprism is 135 ° downwards.
3. module backlight as claimed in claim 1 is characterized in that this refringence a plurality of upwards, microprism downwards is between 0.001 to 0.2.
4. module backlight as claimed in claim 1 is characterized in that these are a plurality of upwards, the bottom side length of microprism is 450 to 550 microns downwards, and height is 200 to 250 microns.
5. module backlight as claimed in claim 1 is characterized in that these are a plurality of upwards, microprism two is reserved with a wall relatively between the surface downwards, and this wall and this refringence a plurality of upwards, microprism downwards are between 0.001 to 0.2.
6. module backlight as claimed in claim 1 is characterized in that this light guide plate is a rectangular parallelepiped or sphenoid, and this bottom surface is provided with a plurality of sites.
7. module backlight as claimed in claim 1 is characterized in that this quarter wave plate face away from light guide one side bottom surface is coated with reflectance coating.
8. liquid crystal indicator, it comprises a thin film transistor (TFT) glass substrate, one colored filter glass substrate, a plurality of liquid crystal molecules that are positioned between thin film transistor (TFT) glass substrate and colored filter glass substrate, two are positioned the Polarizer of thin film transistor (TFT) glass substrate and colored filter glass substrate both sides respectively, the optical direction of this two Polarizer is vertical mutually to be provided with, and the module backlight of the Polarizer of an adjacent films transistor glass substrate one side setting, it comprises a light guide plate of being made by transparent material, and this light guide plate comprises a light entrance face and one and the light-emitting face that intersects of the plane of incidence; One is positioned at the light source of light guide plate light entrance face one side; It is characterized in that: this module backlight comprises that also one is arranged at the upwards prism plate of light guide plate light-emitting face, its face away from light guide one side surface evenly is provided with a plurality of upwards microprisms, continuously and is positioned at the upwards downward prism plate of prism plate microprism one side, it comprises a brightness enhancement film and an a plurality of downward microprism from the extension of brightness enhancement film one, and the quarter wave plate that is provided with of contiguous bottom surface of light guide plate, this is a plurality of upwards, downwards microprisms be meshing with each other and its drift angle respectively between 125 ° to 145 °.
9. liquid crystal indicator as claimed in claim 8 is characterized in that these are a plurality of upwards, the drift angle of microprism is 135 ° downwards.
10. liquid crystal indicator as claimed in claim 8 is characterized in that this refringence a plurality of upwards, microprism downwards is between 0.001 to 0.2.
11. liquid crystal indicator as claimed in claim 8 is characterized in that these are a plurality of upwards, the bottom side length of microprism is 450 to 550 microns downwards, height is 200 to 250 microns.
12. liquid crystal indicator as claimed in claim 8 is characterized in that these are a plurality of upwards, microprism two is reserved with a wall relatively between the surface downwards, this wall and this refringence a plurality of upwards, microprism downwards are between 0.001 to 0.2.
13. liquid crystal indicator as claimed in claim 8 is characterized in that this light guide plate is a rectangular parallelepiped or sphenoid, this bottom surface is provided with a plurality of sites.
14. liquid crystal indicator as claimed in claim 8 is characterized in that this quarter wave plate face away from light guide one side bottom surface is coated with reflectance coating.
CNB021521794A 2002-12-03 2002-12-03 Backlight module and liquid crystal display device Expired - Fee Related CN100383622C (en)

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Application Number Priority Date Filing Date Title
CNB021521794A CN100383622C (en) 2002-12-03 2002-12-03 Backlight module and liquid crystal display device

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CN100383622C true CN100383622C (en) 2008-04-23

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Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI457619B (en) * 2011-09-07 2014-10-21 Au Optronics Corp Light guiding plate, backlight module and display device
CN103076693A (en) * 2011-10-26 2013-05-01 东莞万士达液晶显示器有限公司 Initiative element array substrate and display
CN108169949A (en) * 2016-12-07 2018-06-15 群创光电股份有限公司 Show equipment
CN107272250B (en) * 2017-07-07 2019-11-05 上海天马微电子有限公司 A kind of display panel and display device
KR102617385B1 (en) * 2018-08-23 2023-12-27 삼성디스플레이 주식회사 Optical unit and display device including the optical unit
CN111490078B (en) * 2020-02-13 2023-04-18 京东方科技集团股份有限公司 Display substrate and display device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5587816A (en) * 1992-10-09 1996-12-24 Asahi Glass Company Ltd. LCD device including an illumination device having a polarized light separating sheet between a light guide and the display
CN1038879C (en) * 1993-04-19 1998-06-24 布莱特维技术股份有限公司 A backlighting system with a multi-reflection light injection system and using microprisms
CN1191610A (en) * 1995-06-26 1998-08-26 美国3M公司 Liquid crystal display projection system using multilayer optical film polarizers

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5587816A (en) * 1992-10-09 1996-12-24 Asahi Glass Company Ltd. LCD device including an illumination device having a polarized light separating sheet between a light guide and the display
CN1038879C (en) * 1993-04-19 1998-06-24 布莱特维技术股份有限公司 A backlighting system with a multi-reflection light injection system and using microprisms
CN1191610A (en) * 1995-06-26 1998-08-26 美国3M公司 Liquid crystal display projection system using multilayer optical film polarizers

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