WO2007040199A1 - 面光源装置 - Google Patents
面光源装置 Download PDFInfo
- Publication number
- WO2007040199A1 WO2007040199A1 PCT/JP2006/319689 JP2006319689W WO2007040199A1 WO 2007040199 A1 WO2007040199 A1 WO 2007040199A1 JP 2006319689 W JP2006319689 W JP 2006319689W WO 2007040199 A1 WO2007040199 A1 WO 2007040199A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- light source
- linear light
- partition plate
- plate
- source device
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133605—Direct backlight including specially adapted reflectors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V7/00—Reflectors for light sources
- F21V7/005—Reflectors for light sources with an elongated shape to cooperate with linear light sources
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133604—Direct backlight with lamps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2103/00—Elongate light sources, e.g. fluorescent tubes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2105/00—Planar light sources
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
Definitions
- the present invention relates to a surface light source device used for, for example, a backlight of a liquid crystal display device or an illumination signboard.
- a surface light source device used for a backlight of a liquid crystal display device or an illumination signboard there is one using a light reflecting plate made of a synthetic resin having a three-dimensional shape.
- a light reflecting plate for example, a film or sheet of foamed plastic that reflects light is formed with a linear fold line such as a perforation line, a pushing line, a half cut, and the like.
- a light reflecting plate in which a mountain-shaped portion is formed by bending a wire along the bending line see, for example, Patent Document 1).
- Patent Document 1 Japanese Patent Application Laid-Open No. 2004-138715
- the surface light source device using the light reflecting plate of Patent Document 1 has room for further improvement in terms of improvement in luminance and reduction in luminance unevenness.
- the present invention has been made in view of the above-described circumstances, and is a surface light source device using a light reflector having a three-dimensional shape, the surface light source device having high average luminance and small luminance unevenness.
- the purpose is to provide.
- a linear light source is disposed between the reflector and the diffuser, and between the adjacent linear light sources.
- a surface light source device provided with a reflective mountain-shaped partition plate, a surface light source device with high average luminance and small luminance unevenness can be obtained when the height and base angle of the mountain-shaped partition plate are appropriately set. I found out.
- the present invention has been made on the basis of the above-described knowledge, and is a reaction that is arranged in parallel to each other.
- a plurality of linear light sources are arranged in parallel between the projecting plate and the diffusing plate, and a reflective chevron partition plate that protrudes in a chevron shape from the reflecting plate is provided between adjacent linear light sources.
- the vertical distance from the reflector to the top of the mountain-shaped partition plate is ⁇
- the reflector power is Q
- the vertical distance to the center of the linear light source is Q
- the reflector power is the diffuser.
- the vertical distance is ⁇
- the horizontal distance from the center of the linear light source to the skirt of the mountain-shaped partition plate is L
- the horizontal distance between the centers of the adjacent linear light sources is P
- the diameter of the linear light source is D.
- a surface light source device that satisfies the following conditions (1), (2), and (3) when the base angle of the mountain-shaped partition plate is 0.
- the surface light source device of the present invention has a high average luminance and a small luminance unevenness.
- FIG. 1 is a diagram schematically showing one embodiment of a surface light source device according to the present invention.
- FIG. 2 is a graph showing the results of measuring the luminance of surface light source devices of examples and comparative examples.
- FIG. 3 is a graph showing the results of measuring the luminance of surface light source devices of examples and comparative examples.
- FIG. 1 is a diagram schematically showing an embodiment of a surface light source device according to the present invention.
- a plurality of linear light sources (cold cathode ray tubes) 16 are arranged in parallel and at equal intervals between a reflector 12 and a diffuser 14 arranged in parallel to each other.
- a reflective mountain-shaped partition plate 18 protruding in a mountain shape from the reflecting plate 12 is provided between the adjacent linear light sources 16.
- the chevron-shaped partition plate 18 may be formed integrally with the reflecting plate 12 or may be mechanically joined to the reflecting plate 12 or may be fixed to the reflecting plate 12 with an adhesive or the like.
- the vertical distance from the reflector 12 to the top 20 of the mountain-shaped partition 18 is ⁇
- the vertical distance from the reflector 12 to the center 22 of the linear light source 16 is Q
- Reflector 12 H The vertical distance to the diffuser 14 is H
- the horizontal distance from the center 22 of the linear light source 16 to the skirt 24 of the mountain-shaped partition 18 is L
- the horizontal distance between the centers 22 of the adjacent linear light sources 16 is P.
- Condition (1) is that the line 28 connecting the center 22 of the linear light source 16 and the portion 26 directly above the adjacent linear light source 16 of the diffuser 14 intersects the center line 30 between the adjacent linear light sources 16. This means that the apex 20 of the mountain-shaped partition plate 18 exists at a position 32 or more, which is lower by the distance of the radius of the linear light source 16 than the position 32.
- Condition (2) is that the reflected light (specular reflection component) 34 at the skirt 24 of the mountain-shaped partition plate 18 of light from the linear light source 16 is not reflected and projected outside the center 22 of the linear light source 16. means.
- Condition (3) is that the reflected light (specular reflection component) 36 of the light from the linear light source 16 at the top 20 of the mountain-shaped partition 18 is outside the top 20 of the mountain-shaped partition 18 (next to the light source side). ) Is reflected and projected.
- the surface light source device of this example since the height and inclination of the reflective mountain-shaped partition plate existing between the light sources satisfies the conditions (1) to (3), the light emitted from the light source is directly under the light source. Reflected and diffused by the reflector, and effectively reflected and diffused by the mountain-shaped partition, resulting in an improvement in average brightness and a reduction in brightness unevenness.
- the material for forming the reflecting plate and the reflective chevron partition plate is not limited, but a foamed sheet having a diffuse reflectance of 95% or more is preferably used. be able to. Particularly preferred is a thermoplastic resin film or sheet having fine bubbles or pores having an average bubble diameter of not less than the wavelength of light and not more than 50 m inside.
- thermoplastic resin film or sheet material examples include polyethylene, polypropylene, polystyrene, polychlorinated butyl, polychlorinated biphenyl, polyethylene terephthalate, polyvinyl alcohol, and other general-purpose resins, polycarbonate, and poly Butylene terephthalate, polyethylene naphthalate, polyamide, polyacetal, polyphenylene ether, ultrahigh molecular weight polyethylene, polysulfone, polyethersulfone, polyphenylene Examples include sulfide, polyarylate, polyamide imide, polyether imide, polyether ether ketone, polyimide, polytetrafluoroethylene, liquid crystal polymer, engineering plastics such as fluorine resin, and copolymers or mixtures thereof.
- polyester, polyethylene sulfide, polypropylene, and cyclopolyolefin are preferred because of their good heat resistance and impact resistance.
- antioxidants, UV inhibitors, lubricants, pigments, reinforcing agents, and the like can be added as appropriate to the thermoplastic resin.
- an extruded sheet of thermoplastic polyester is impregnated with carbon dioxide gas under high pressure and then heated and foamed.
- a polyester-based foam sheet for example, M CPET (registered trademark) manufactured by Furukawa Electric Co., Ltd.
- a cyclopolyolefin foam sheet having an internal cell diameter of 50 m or less can also be used.
- thermoplastic resin film or sheet containing a filler is a thermoplastic resin film or sheet containing a filler, and a large number of fillers are used as cores.
- examples thereof include a film or sheet in which a void is formed.
- the thermoplastic resin film or sheet containing the filler is formed into an unstretched film or sheet containing the filler, and the unstretched film or sheet is formed on the film or sheet. It is preferably a porous stretched film or sheet in which a number of voids are formed with the filler as a core by stretching.
- the thickness of the foam sheet forming the reflecting plate and the reflective chevron-shaped partition plate is preferably 200 to 2000 ⁇ m.
- the thickness of the foamed sheet is in the range of 200 to 2000 ⁇ m, rigidity is preferred.
- the specific gravity of the foamed sheet is preferably 0.1 to 0.7.
- the reflecting plate and the reflective mountain-shaped partition plate in the present invention may be formed by appropriately attaching the above-described film or sheet to a metal plate.
- the diffuse reflectance refers to the ratio of the diffuse reflection flux to the incident light flux, measured with a spectrophotometer in the wavelength range of 400 to 1200 nm, and fine powder of barium sulfate is consolidated.
- the value obtained as the relative value when the diffuse reflectance of the white board is 100%.
- Autospectroscopic light For example, UV-3100PC (trade name, manufactured by Shimadzu Corporation) can be used as the meter.
- linear light source for example, a straight tube fluorescent lamp or a cold cathode tube can be used.
- the diffusion plate can be appropriately selected and used.
- Example 1 and Example 2 satisfy all the conditions (1) to (3), Comparative Example 1 satisfies only the conditions (1) and (3), and Comparative Example 2 includes the conditions (1) and (2 ), And Comparative Example 3 satisfies only conditions (2) and (3). Further, as Comparative Example 4, a surface light source device similar to that of Example 1 was produced except that a mountain-shaped partition plate was not provided between adjacent fluorescent lamps.
- the reflective plate and the reflective chevron-shaped partition plate are polyethylene-terephthalate-based resin foams of fine bubbles having an average bubble diameter of 10 ⁇ m (trade name: MCPET, manufactured by Furukawa Electric Co., Ltd., thickness Lmm, specific gravity of 0.325, and diffuse reflectance at 550 nm (96.0%) were used.
- the surface light source device of the example and the comparative example is set on the liquid crystal television, and the digital luminance meter (TOPCOM: BM-9) and the digital luminance meter receiver (TOPCOM: BM-91 OD) are used.
- the luminance (cdZm 2 ) was measured.
- the results are shown in Figs. 2 and 3, it can be seen that the surface light source device of the example has a higher average luminance and less luminance unevenness than the surface light source device of the comparative example.
Landscapes
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Planar Illumination Modules (AREA)
- Liquid Crystal (AREA)
- Optical Elements Other Than Lenses (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP06811037A EP1933081A4 (en) | 2005-10-04 | 2006-10-02 | PLANAR LIGHT SOURCE |
US12/089,052 US7794097B2 (en) | 2005-10-04 | 2006-10-02 | Planar light source |
CA002624412A CA2624412A1 (en) | 2005-10-04 | 2006-10-02 | Planar light source |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005291078A JP2007103154A (ja) | 2005-10-04 | 2005-10-04 | 面光源装置 |
JP2005-291078 | 2005-10-04 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2007040199A1 true WO2007040199A1 (ja) | 2007-04-12 |
Family
ID=37906240
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2006/319689 WO2007040199A1 (ja) | 2005-10-04 | 2006-10-02 | 面光源装置 |
Country Status (8)
Country | Link |
---|---|
US (1) | US7794097B2 (ja) |
EP (1) | EP1933081A4 (ja) |
JP (1) | JP2007103154A (ja) |
KR (1) | KR20080063754A (ja) |
CN (1) | CN101278149A (ja) |
CA (1) | CA2624412A1 (ja) |
TW (1) | TW200715007A (ja) |
WO (1) | WO2007040199A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8212964B2 (en) | 2008-04-16 | 2012-07-03 | Lg Display Co., Ltd. | Backlight unit and liquid crystal display module including the same |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008270071A (ja) * | 2007-04-24 | 2008-11-06 | Matsushita Electric Ind Co Ltd | 直下型液晶ディスプレイ用バックライト |
WO2009020138A1 (ja) * | 2007-08-08 | 2009-02-12 | Sharp Kabushiki Kaisha | 照明装置および液晶表示装置 |
JP2010020275A (ja) * | 2008-06-10 | 2010-01-28 | Furukawa Electric Co Ltd:The | 内照式表示装置およびその表示パネル |
CN103225770A (zh) * | 2012-01-30 | 2013-07-31 | 群康科技(深圳)有限公司 | 背光模块及包括背光模块的显示装置 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002122863A (ja) * | 2000-10-17 | 2002-04-26 | Hitachi Ltd | 液晶表示装置 |
JP2003022701A (ja) * | 2001-07-09 | 2003-01-24 | Furukawa Electric Co Ltd:The | ライトボックス |
JP2004138715A (ja) | 2002-10-16 | 2004-05-13 | Furukawa Electric Co Ltd:The | 光反射板およびその製造方法 |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100965574B1 (ko) * | 2003-11-21 | 2010-06-23 | 엘지디스플레이 주식회사 | 액정표시모듈 |
-
2005
- 2005-10-04 JP JP2005291078A patent/JP2007103154A/ja active Pending
-
2006
- 2006-09-22 TW TW095135233A patent/TW200715007A/zh unknown
- 2006-10-02 KR KR1020087006540A patent/KR20080063754A/ko not_active Application Discontinuation
- 2006-10-02 WO PCT/JP2006/319689 patent/WO2007040199A1/ja active Application Filing
- 2006-10-02 CA CA002624412A patent/CA2624412A1/en not_active Abandoned
- 2006-10-02 EP EP06811037A patent/EP1933081A4/en not_active Withdrawn
- 2006-10-02 CN CNA2006800368784A patent/CN101278149A/zh active Pending
- 2006-10-02 US US12/089,052 patent/US7794097B2/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002122863A (ja) * | 2000-10-17 | 2002-04-26 | Hitachi Ltd | 液晶表示装置 |
JP2003022701A (ja) * | 2001-07-09 | 2003-01-24 | Furukawa Electric Co Ltd:The | ライトボックス |
JP2004138715A (ja) | 2002-10-16 | 2004-05-13 | Furukawa Electric Co Ltd:The | 光反射板およびその製造方法 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8212964B2 (en) | 2008-04-16 | 2012-07-03 | Lg Display Co., Ltd. | Backlight unit and liquid crystal display module including the same |
Also Published As
Publication number | Publication date |
---|---|
JP2007103154A (ja) | 2007-04-19 |
EP1933081A1 (en) | 2008-06-18 |
US20090231843A1 (en) | 2009-09-17 |
CN101278149A (zh) | 2008-10-01 |
CA2624412A1 (en) | 2007-04-12 |
EP1933081A4 (en) | 2009-09-30 |
TW200715007A (en) | 2007-04-16 |
US7794097B2 (en) | 2010-09-14 |
KR20080063754A (ko) | 2008-07-07 |
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