CN1271459C - Planar light source device and liquid crystal display device using it as back light module - Google Patents
Planar light source device and liquid crystal display device using it as back light module Download PDFInfo
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- CN1271459C CN1271459C CN 02128659 CN02128659A CN1271459C CN 1271459 C CN1271459 C CN 1271459C CN 02128659 CN02128659 CN 02128659 CN 02128659 A CN02128659 A CN 02128659A CN 1271459 C CN1271459 C CN 1271459C
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Abstract
The present invention relates to a planar light source device and a liquid crystal display which uses the planar light source device as a back light module. The present invention provides a light source which has the advantages of simple structure, low cost, high energy utilization rate, uniform illumination and high brightness, and a display which uses the light source as a back light module. The planar light source device comprises a light source and a light guide plate, wherein the light guide plate is provided with an incident surface which faces the light source and an emergent surface, light is emitted into the light guide plate by the incident surface and is emitted out of the light guide plate by the emergent surface, a plurality of metal ruled lines are arranged between the incident surface on the side edge of the light guide plate and the light source, specific polarization direction light can pass through the metal ruled lines, and other light is reflected. The liquid crystal display comprises a liquid crystal display panel and a back light module which is used as a planar light source device; the back light module comprises a light source, a U-shaped reflector and a light guide plate, wherein the light guide plate is provided with an incident surface and an emergent surface, a plurality of metal ruled lines are arranged between the incident surface on the side edge of the light guide plate and the light source, specific polarization direction light can pass through the metal ruled lines, and other light is reflected; a plurality of optical films are arranged between the emergent surface of the light guide plate and the liquid crystal display panel.
Description
Technical field
The invention belongs to display and parts thereof, particularly a kind of planar light source device reaches and makes the LCD of module backlight with it.
Background technology
As shown in Figure 1, the LCD of commonly using (LCD) comprises by the centre and is provided with panel of LCD 10, the module backlight 20 that is disposed at liquid crystal panel 10 belows and the upper and lower shell 11,12 that the two substrates of liquid crystal material constitutes.
Module 20 backlight is to be uniformly distributed to liquid crystal panel 10 surfaces in order to the light that light source is sent.Be used for backlight liquid crystal display module 20 and generally can be divided into straight light source pattern and side light source pattern down.
As shown in Figure 2, directly descend the down straight aphototropism mode set 21 of light source pattern to comprise shell 70, be disposed at shell 70 lower surface reflector plate 60, be positioned at shell 70 bottoms cold cathode tubing fluorescent tube 50, be positioned at the diffusion sheet 40 on the shell 70 and be disposed at prismatic lens 30 on the diffusion sheet 40.
As shown in Figure 3, the side type of side light source pattern module 22 backlight comprise light guide plate 80, at least one fluorescent tube 50 that is installed in light guide plate 80 sides, around the U-shaped reverberator 61 of fluorescent tube 50a, be fixed in light guide plate 80 bottoms reflector plate 60a, be fixed in the diffusion sheet 40a on the light guide plate 80 and be fixed in prismatic lens 30a on the diffusion sheet 40a.Light guide plate 80 sides are fixed in the opening portion system of U-shaped reverberator 61.Because of fluorescent tube 50a system is disposed at light guide plate 80 sides, so the thickness of LCD just is minimized.
Light guide plate has the point-like of printing or the pattern of v-depression on 80 at least one surfaces, and in order to the light scatter in the light guide plate 80 is illuminated panel of LCD, and general system is shaped with PMMA calendering mode or shoot mode.
Diffusion sheet 40a system is disposed on the light guide plate 80, and system is with translucent PET or polycarbonate (polyca rbonate usually; PC), poly terephthalic acid diethylester plastic cement (PET) makes, with so that the light that light guide plate 80 penetrates homogenising more.
Because panel of LCD 10 has in order to the light of specific polarization direction being imported panel of LCD 10 and to absorb the Polarizer of the light of another polarization direction, so light will lose about 50% optical energy during by Polarizer.Therefore; usually can be on prismatic lens 30 configuration polarisation circulation film (PolarizationRecycle Film) 35, in order to reflecting the light of another polarization direction, and behind the change of reflection polarization direction by the below optical element; recycling in addition again, the brightness that improves LCD 10 by this.Yet aforesaid polarisation circulation film 35 is the 3M available from the Minn. usually
TMCompany, commodity are called DualBrightness Enhancement Film (DBEF), it can make the brightness of LCD increase to about 160%-170% relatively, but polarisation circulation film 35 is quite expensive, and under the more and more large-sized development trend of panel of LCD 10, manufacturing cost will significantly increase.
In sum, the backlight liquid crystal display module must satisfy high S. E. A., increases screen brightness, uniform illumination is provided, reduces power consumption, reduces manufacturing cost and reduces demand such as volume.For this reason, many prior arts of attempting to satisfy aforementioned requirement are disclosed.Give people's such as Hooker No. the 5th, 477,422, United States Patent (USP) as No. the 6th, 164,790, United States Patent (USP), the Dec 19 nineteen ninety-five of giving Lee on Dec 26th, 2000 and gave people's such as Ciupke No. the 5th, 485,354, United States Patent (USP) on January 16th, 1996.Yet above-mentioned patent and the module backlight that prior art provided still can't satisfy above-mentioned requirement for module backlight.
For this reason, in No. the 6th, 086,212, the United States Patent (USP) of giving people such as Onishi on July 11st, 2000, disclosed a kind of module backlight, its have the emergent light control panel on the light guide plate of being disposed at and be disposed at light source and light guide plate between the incident light control panel.Yet the structure of this kind module backlight is quite complicated, and the illumination of panel of LCD also can't strengthen effectively.
Summary of the invention
The purpose of this invention is to provide a kind of simple in structure, cost is low, capacity usage ratio is high, illumination is even, brightness is high planar light source device and make the LCD of module backlight with it.
Planar light source device of the present invention comprises light source and light guide plate; Light guide plate has towards light source to be injected the plane of incidence of light guide plate and makes the exit facet that light penetrates in the light guide plate to make light; Be provided with between the light guide plate side plane of incidence and the light source with so that specific polar biased direction light by and reflect the plural metal ruling of all the other light; LCD comprises panel of LCD and is the module backlight of the planar light source device of uniform irradiation panel of LCD; Module backlight comprises at least one light source, at least one U-shaped reverberator and light guide plate around light source; Light guide plate has towards light source to be injected the plane of incidence of light guide plate and makes the exit facet that light penetrates in the light guide plate to make light; Be provided with between the light guide plate side plane of incidence and the light source with so that specific polar biased direction light by and reflect the reflecting type polarizing element of all the other light; Be provided with most blooming pieces between light guide plate exit facet and the panel of LCD.
Wherein:
The reflecting type polarizing element is plural metal ruling.
The light source outer shroud is arranged with the U-shaped reverberator.
Light guide plate has plural number in order to scatter incident light line and the dispersing element that penetrated by exit facet.
The metal grid wire material is aluminium, silver or alloying metal.
The metal grid wire material is an aluminium.
Spacing between the metal ruling is less than 300nm.
The thickness of metal ruling is between 30nm～200nm.
The width of metal ruling and spacing ratio are between 0.1 to 0.8.
The metal ruling directly is formed on the light guide plate.
The reflecting type polarizing element is a sheet cholesteric liquid crystalline polymer.
A kind of LCD, it comprises panel of LCD and is the module backlight of the planar light source device of uniform irradiation panel of LCD; Module backlight comprises at least one light source, at least one U-shaped reverberator and light guide plate around light source; Light guide plate has towards light source to be injected the plane of incidence of light guide plate and makes the exit facet that light penetrates in the light guide plate to make light; It is characterized in that being provided with between the described light guide plate side plane of incidence and the light source with so that specific polar biased direction light by and reflect the reflecting type polarizing element of all the other light; Be provided with multi-layer optical membrane between light guide plate exit facet and the panel of LCD.
Multi-layer optical membrane is for so that light diffusion sheet and with so that light concentrates on the prismatic lens of vertical direction more uniformly.
The reflecting type polarizing element is a sheet cholesteric liquid crystalline polymer.
Because planar light source device of the present invention comprises light source and light guide plate; Light guide plate has towards light source to be injected the plane of incidence of light guide plate and makes the exit facet that light penetrates in the light guide plate to make light; Be provided with between the light guide plate side plane of incidence and the light source with so that specific polar biased direction light by and reflect the reflecting type polarizing element of all the other light; LCD comprises panel of LCD and is the module backlight of planar light source device; Module backlight comprises at least one light source, at least one U-shaped reverberator and light guide plate around light source; The light guide plate plane of incidence and exit facet; Be provided with between the light guide plate side plane of incidence and the light source with so that specific polar biased direction light by and reflect the plural metal ruling of all the other light; Be provided with most blooming pieces between light guide plate exit facet and the panel of LCD.The light of light emitted is non-polarization light, and it has the parallel component that is parallel to the metal ruling and is reflected and enters vertical component in the light guide plate perpendicular to the metal ruling and by the metal ruling.Therefore, only there is deflection polarity can enter in the light guide plate perpendicular to the vertical component of metal ruling; After the reflection of horizontal component mat and change deflection polarity that is reflected, pass the metal ruling again and enter in the light guide plate; Enter in the light guide plate for the vertical component of polar biased light in light guide plate and go into to inject in the panel of LCD with the polar biased direction perpendicular to the metal ruling substantially; Promptly form the light that can directly pass through the LCD polarization by the planar light source device of tool reflecting type polarizing element and with its LCD as module backlight, the light that reduces display panels by this and absorbed, do not need to use the expensive optical film sheet, just can improve the manufacturing cost of the capacity usage ratio of whole LCD, the illumination that increases LCD, reduction LCD.Not only simple in structure, cost is low, and the capacity usage ratio height, illumination is even, brightness is high, thereby reaches purpose of the present invention.
Description of drawings
Fig. 1, be known LCD decomposition texture schematic isometric.
Fig. 2, be known down straight aphototropism mode set structural representation cut-open view.
Fig. 3, be known side type back light module unit structure schematic sectional view.
Fig. 4, be the embodiment of the invention one liquid crystal display device structure schematic sectional view.
Fig. 5, be the local amplification stereogram of A portion among Fig. 4.
Fig. 6, be the embodiment of the invention two liquid crystal display device structure schematic sectional views.
Fig. 7, be the embodiment of the invention three liquid crystal display device structure schematic sectional views.
Fig. 8, be the embodiment of the invention four liquid crystal display device structure schematic sectional views.
Embodiment
Embodiment one
As shown in Figure 1, LCD 100 of the present invention comprises panel of LCD 110 and is the module backlight 120 of planar light source device.
Panel of LCD 110 comprises two transparency carriers 112,113 and is disposed at liquid crystal material 116 in the two substrates 112,113.
Have light polarizing film 118,119 respectively on 110 liang of transparency carriers of panel of LCD, 112,114 outer surfaces, have on its inner surface in order to change Liquid Crystal Molecules Alignment and use the on-off element (switching element) that produces image.
Module 120 backlight is the planar light source device as uniform irradiation panel of LCD 110.It comprises light source 150, around the U-shaped reverberator 161 of light source 150, be roughly the light guide plate 180 and the multi-layer optical membrane of wedge shape.
The light guide plate side is fixed in the opening portion system of U-shaped reverberator 161.
The dispersing element 182 of light guide plate 180 is dot pattern or v-depression, and it is in order to penetrating and become uniform surface light source with the light scatter in the light guide plate 180 and by light guide plate 180 upper surfaces/exit facet, and illuminates panel of LCD 110.Plural number dispersing element 182 general systems are shaped with PMMA calendering mode or shoot mode.
As shown in Figure 5, the plane of incidence 184 of light guide plate 180 has plural metal ruling 190.Plural number metal ruling 190 is directly to be formed on the plane of incidence 184 at interval.
Multi-layer optical membrane system is arranged between light guide plate 180 exit facets 185 and the panel of LCD 110, and it is for so that the uniform more diffusion sheet 140 of light and with so that light concentrates on the prismatic lens 130 of vertical direction.
Light source 150 can be cold cathode ray tube (cold cathode fluorescent lamp; CCFL).
Prismatic lens 130 can be available from 3M
TMCompany, commodity are called BEF II (Brightness EnhancementFilm II),
Polar biased light perpendicular to metal ruling 190 directions enters in the light guide plate 180 by the plane of incidence 184; The polar biased light that is parallel to metal ruling 190 directions is then reflexed to reverberator 161 by metal ruling 190.
As shown in Figure 4, the light of light source 150 emission is non-polarization light, and it has and is parallel to metal ruling 190 on the plane of incidence 184 and the parallel component that is reflected and enters vertical component in the light guide plate 180 perpendicular to the plane of incidence 184 metal rulings 190 and by metal ruling 190.Therefore, only there is deflection polarity can enter in the light guide plate 180 perpendicular to the vertical component of metal ruling 190.And the horizontal component that is reflected is passed metal ruling 190 again and is entered in the light guide plate 180 by after reverberator 161 reflections and changing deflection polarity.The vertical component for polar biased light that enters in the light guide plate 180 is plural dispersing element 182 reflections in light guide plate 190, and to go into to inject in the panel of LCD 110 perpendicular to the polar biased direction of metal ruling 190 substantially, reduce display panels 110 light polarizing film 118,119 light that absorbed by this, and improve the light utilization of LCD 100.
Metal ruling 190 preferable systems are by aluminium, silver or alloying metal manufacturing, and wherein the best is with the aluminium manufacturing.
As shown in Figure 5, the spacing system between the metal ruling 190 is less than 300nm, and the thickness of metal ruling 190 is that the width of metal ruling 190 and spacing ratio are between about 0.1 to 0.8 by between 30nm～200nm.Metal ruling 190 also can be formed on the substrate, is placed between light guide plate 180 and the light source 150 again.
Metal ruling 190 is a kind of reflecting type polarizing element, its reflection parallel direction polar biased light, and these light that are reflected can change the direction of polar biased by the reflection of reverberator 161, again by metal ruling 190, so just are improved the light utilization of LCD 110.Therefore, the reflecting type polarizing element of other kinds is such as sheet cholesteric liquid crystalline polymer (cholesteric liquid crystallinepolymer), have the sheet cholesteric liquid crystalline polymer and the 3M of 1/4 λ plate
TMThe DBEF of company's manufacturing also can be in order to replace metal ruling 190.
The polar biased direction of the light polarizing film 118,119 on the panel of LCD 110 should be corresponding with the polar biased direction of reflecting type polarizing plate, uses the illumination that improves LCD 100.Generally speaking, because of the configuration of LCD 100, module 20 backlight is specially adapted to membrane transistor (the Thin Film Transistor) panel of LCD of transverse electric field effect (In-Plane-Switching), vertical orientation (Vertical Alignment) and multiregional vertical align (Multi-Domain VerticalAlignment).
Embodiment two
As shown in Figure 6, LCD 200 of the present invention comprises panel of LCD 210 and is the module backlight 220 of planar light source device.
Panel of LCD 210 comprises two transparency carriers 212,214 and is disposed at liquid crystal material 216 in the two substrates 212,214.
Have light polarizing film 218,219 respectively on 210 liang of transparency carriers of panel of LCD, 212,214 outer surfaces, have on its inner surface in order to change Liquid Crystal Molecules Alignment and use the on-off element (switching element) that produces image.
Two light sources 250 and two U-shaped reverberators 261 are to be disposed at light guide plate 280 dual-sides, and U-shaped reverberator 261 is fixed in light guide plate 280 sides with its opening portion system.
Embodiment three
As shown in Figure 7, LCD 300 of the present invention comprises panel of LCD and is the module backlight 320 of planar light source device.
Module 320 backlight comprises light guide plate 380 and is disposed at three light sources 350 of light guide plate 380 3 sides respectively.Light guide plate 380 3 sides and three 350 of light sources are respectively the plane of incidence 384 that is provided with plural metal ruling 390.
Embodiment four
As shown in Figure 8, LCD of the present invention comprises panel of LCD and is the module backlight 420 of planar light source device.
In sum, the present invention by as the module backlight of planar light source so that the light of polarization to be provided.The light of this polarization can be directly by the light polarizing film of LCD, thereby reduce the light that light polarizing film absorbed.And module backlight of the present invention does not need to use the expensive optical film sheet, just can improve the manufacturing cost of the capacity usage ratio of whole LCD, the illumination that increases LCD, reduction LCD.
Claims (22)
1, a kind of planar light source device, it comprises light source and light guide plate; Light guide plate has towards light source to be injected the plane of incidence of light guide plate and makes the exit facet that light penetrates in the light guide plate to make light; It is characterized in that being provided with between the described light guide plate side plane of incidence and the light source with so that specific polar biased direction light by and reflect the reflecting type polarizing element of all the other light.
2, planar light source device according to claim 1 is characterized in that described reflecting type polarizing element is plural metal ruling.
3, planar light source device according to claim 2 is characterized in that described light source outer shroud is arranged with the U-shaped reverberator.
4, planar light source device according to claim 2 is characterized in that described light guide plate has plural number in order to scatter incident light line and the dispersing element that penetrated by exit facet.
5, planar light source device according to claim 2 is characterized in that described metal grid wire material is aluminium, silver or alloying metal.
6, planar light source device according to claim 5 is characterized in that described metal grid wire material is an aluminium.
7, planar light source device according to claim 2, it is characterized in that described metal ruling between spacing less than 300nm.
8, planar light source device according to claim 2, the thickness that it is characterized in that described metal ruling is between 30nm～200nm.
9, planar light source device according to claim 2 is characterized in that the width of described metal ruling and spacing ratio are between 0.1 to 0.8.
10, planar light source device according to claim 2 is characterized in that described metal ruling directly is formed on the light guide plate.
11, planar light source device according to claim 1 is characterized in that described reflecting type polarizing element is a sheet cholesteric liquid crystalline polymer.
12, planar light source device according to claim 11 is characterized in that described light source outer shroud is arranged with the U-shaped reverberator.
13, planar light source device according to claim 11 is characterized in that described light guide plate has plural number in order to scatter incident light line and the dispersing element that penetrated by exit facet.
14, a kind of LCD, it comprises panel of LCD and is the module backlight of the planar light source device of uniform irradiation panel of LCD; Module backlight comprises at least one light source, at least one U-shaped reverberator and light guide plate around light source; Light guide plate has towards light source to be injected the plane of incidence of light guide plate and makes the exit facet that light penetrates in the light guide plate to make light; It is characterized in that being provided with between the described light guide plate side plane of incidence and the light source with so that specific polar biased direction light by and reflect the reflecting type polarizing element of all the other light; Be provided with multi-layer optical membrane between light guide plate exit facet and the panel of LCD.
15, LCD according to claim 14 is characterized in that described reflecting type polarizing element is plural metal ruling.
16, LCD according to claim 15 is characterized in that described metal grid wire material is aluminium, silver or alloying metal.
17, LCD according to claim 16 is characterized in that described metal grid wire material is an aluminium.
18, LCD according to claim 15, it is characterized in that described metal ruling between spacing less than 300nm.
19, LCD according to claim 15, the thickness that it is characterized in that described metal ruling is between 30nm～200nm.
20, LCD according to claim 15 is characterized in that the width of described metal ruling and spacing ratio are between 0.1 to 0.8.
21, LCD according to claim 15 is characterized in that described multi-layer optical membrane is for so that light diffusion sheet and with so that light concentrates on the prismatic lens of vertical direction more uniformly.
22, LCD according to claim 14 is characterized in that described reflecting type polarizing element is a sheet cholesteric liquid crystalline polymer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02128659 CN1271459C (en) | 2002-08-09 | 2002-08-09 | Planar light source device and liquid crystal display device using it as back light module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02128659 CN1271459C (en) | 2002-08-09 | 2002-08-09 | Planar light source device and liquid crystal display device using it as back light module |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1474214A CN1474214A (en) | 2004-02-11 |
| CN1271459C true CN1271459C (en) | 2006-08-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02128659 Expired - Fee Related CN1271459C (en) | 2002-08-09 | 2002-08-09 | Planar light source device and liquid crystal display device using it as back light module |
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| CN (1) | CN1271459C (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100346210C (en) * | 2004-05-28 | 2007-10-31 | 友达光电股份有限公司 | Structure and method for light background module internal compensated dark space brightness |
| CN1725922A (en) | 2004-07-22 | 2006-01-25 | 清华大学 | Field transmitting plane light source device and its cathode |
| CN1728329A (en) | 2004-07-30 | 2006-02-01 | 清华大学 | Light source equipment |
| CN1881023B (en) * | 2005-06-16 | 2011-11-23 | 清华大学 | Backlight module assembly |
| KR20060135153A (en) | 2005-06-24 | 2006-12-29 | 삼성전자주식회사 | Liquid crystal display device |
| CN103185226A (en) * | 2011-12-28 | 2013-07-03 | 东莞万士达液晶显示器有限公司 | Illuminating module |
| CN104282225B (en) * | 2013-07-01 | 2017-07-14 | 元太科技工业股份有限公司 | Display device |
| CN104344280A (en) | 2013-07-31 | 2015-02-11 | 扬升照明股份有限公司 | Light source module |
| TWI547668B (en) * | 2014-12-09 | 2016-09-01 | 揚昇照明股份有限公司 | Light source module |
| CN107300806A (en) * | 2017-05-27 | 2017-10-27 | 京东方科技集团股份有限公司 | Backlight module and display device |
| CN114355670A (en) * | 2022-01-10 | 2022-04-15 | Tcl华星光电技术有限公司 | Light source module, liquid crystal display device and display equipment |
-
2002
- 2002-08-09 CN CN 02128659 patent/CN1271459C/en not_active Expired - Fee Related
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| CN1474214A (en) | 2004-02-11 |
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Granted publication date: 20060823 Termination date: 20160809 |