CN1145836C - Light conducting plate, and area source and liquid crystal display device using the same light conducting plate - Google Patents
Light conducting plate, and area source and liquid crystal display device using the same light conducting plate Download PDFInfo
- Publication number
- CN1145836C CN1145836C CNB981214355A CN98121435A CN1145836C CN 1145836 C CN1145836 C CN 1145836C CN B981214355 A CNB981214355 A CN B981214355A CN 98121435 A CN98121435 A CN 98121435A CN 1145836 C CN1145836 C CN 1145836C
- Authority
- CN
- China
- Prior art keywords
- light
- guide plate
- taken
- light guide
- liquid crystal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
- G02B6/0028—Light guide, e.g. taper
-
- 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
- G02F1/133524—Light-guides, e.g. fibre-optic bundles, louvered or jalousie light-guides
-
- 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
- G02F1/133618—Illuminating devices for ambient light
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)
- Planar Illumination Modules (AREA)
- Light Guides In General And Applications Therefor (AREA)
- Liquid Crystal (AREA)
Abstract
The present invention provides a light guiding plate to reduce power consumption in a main light source by improving the external light intake efficiency. By using the surface light source and LCD display apparatus of the light guide plate, an external light intake part 1a is formed simultaneously with the production of a light guiding plate 1 by resin molding using a metallic mold. Since an external light intake surface of the intake part 1a is directed to an upper oblique part shown by a black arrow, external light can be most taken in from the shown direction and external light can be also incident from a just upper or side direction efficiently. Incident light from a light source through a light incident surface 1c and external light are reflected on a light reflection surface 1d and on two side faces 1b of the light guiding plate 1 and synthetic light having uniform directivity is emitted from a light exit surface 1e.
Description
The present invention relates to light guide plate, use the area source and the liquid crystal indicator of this light guide plate, be particularly related to and be used for the backlight of liquid crystal indicator and be used for lighting advertisement and the area source of traffic sign etc. and be furnished with the light guide plate of this area source and the liquid crystal indicator of mode backlight such as view finder.
As the area source of the usefulness backlight of liquid crystal indicator, known with the area source of light transmission flat board as the sidelight mode of light guide plate.In this area source, side end face one side from the light guide plate that constitutes by transparent parallel flat and section plate wedge, incident is from the light of light sources such as fluorescent light, utilize the dull and stereotyped inner total reflection of light transmission, the light propagation is spreaded all over the whole zone of light guide plate, the scattered reflection light of the part of this propagates light, from light guide plate surface emitting diffusion light (opening clear 55-162201 in fact) with the light scattering reflecting plate formation critical angle deficiency of light guide plate the inside.
In addition, for outer light such as sunshine and room lights as secondary light source, light was taken into the area source of usefulness backlight of part outside known side end face in light guide plate was provided with, this outer light be taken into partly to be shaped as section circular-arc, constitute a cylindrical lens (spy opens flat 5-11249).
Fig. 1 is a synoptic diagram of representing liquid crystal indicator in the past.
Liquid crystal indicator in the past is furnished with liquid crystal display 9 and light guide plate 1, under the situation that for example the quiet view finder that resembles camera uses as electronics liquid crystal indicator, as camera body, the cameraman utilizes the ejaculation light of light emergence face 1e to watch subject from the right side of liquid crystal display 9 in the left side of light guide plate 1.
In addition, end on light guide plate 1 top of being furnished with liquid crystal indicator in the past, in order to be taken into outer light as fill-in light, be provided with the outer light that constitutes by the circular-arc cylindrical lens of section and be taken into part 1a, because the outer light of cylindrical lens is taken into face (among this figure, the face that dotted line A-A ' forms when the paper vertical direction moves) towards the last direction of paper (among the figure with the direction shown in ' direction of face '), thus can be taken into best from directly over outer light.
But, in the light guide plate of in the past liquid crystal indicator, as mentioned above, although the quiet camera that resembles of electronics is contained in the left side, although the outer light from left side or top is less and since become the best be taken into from directly over the structure of outer light, its result, the efficient that is taken into outer light is very low, and existence can not realize reducing the problem of consumed power.
In order to address the above problem, the object of the present invention is to provide light guide plate, use the area source and the liquid crystal indicator of this light guide plate, wherein this light guide plate is taken into efficient by improving outer light, can reduce the consumed power in the main light source, and then can not want main light source.
To achieve these goals, the light guide plate of the present invention's first scheme is shaped integratedly with resin, it is characterized in that, the top of described light guide plate one end be furnished be taken into outside the outer light of light be taken into part, the outer light that described outer light is taken into part is taken into and faces obliquely upward.
The area source of alternative plan of the present invention is characterised in that, is furnished with the light source of installing on described light guide plate of first scheme and the face beyond the outer light of described light guide plate is taken into part and light emergence face.
The liquid crystal indicator of third party's case of the present invention is characterised in that, the liquid crystal display of being furnished with scheme 1 described light guide plate and installing near the light emergence face of described light guide plate.
Fig. 1 is the mode chart of liquid crystal indicator in the past.
Fig. 2 is the mode chart of light guide plate of the present invention.
Fig. 3 is the synoptic diagram of expression area source of the present invention.
Fig. 4 is the synoptic diagram that expression is furnished with the liquid crystal indicator of area source of the present invention.
Below, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Fig. 2 is the mode chart of light guide plate of the present invention.
The 1st, light guide plate when preparation utilizes the light guide plate 1 of metal pattern by ester moulding, also forms following outer light at the top of light guide plate 1 end and is taken into part 1a.
1a is that outer light is taken into part, is taken into as outer light such as the sunshine of fill-in light and room lights.It is the circular-arc cylindrical lens of section that this outer light is taken into part 1a, owing to should be taken into face (among the figure by outer light, the face that dotted line A-A ' forms when the direction of a side side 1b moves) towards the black direction of arrow (among the figure with the direction shown in ' oblique upper '), so can be taken into outer light best from oblique upper, even from directly over and the outer light of positive side surface direction, also incident expeditiously.But outer light is taken into part 1a and is not limited to circular-arc cylindrical lens, as long as outer light is taken into and faces obliquely upward, for example triangular prism lens etc. also can.
1c is a light entrance face, and is as described below, the light that incident is omitted and is shone near the light source (not shown) of light entrance face 1c setting abreast.Have, the side at two side 1b also can dispose light source again, with it as light entrance face.
1d is a light reflection surface, behind ester moulding, for leakage and the raising reflectivity that prevents light, reflecting plate (not shown)s such as aluminium is installed after carrying out the point-like printing.
1e is a light emergence face, is taken into the light of part 1a and light entrance face 1c incident with two offside reflections of light reflection surface 1d and light guide plate 1 from outer light, and the most of of incident light finally penetrates as the synthetic light that even directivity is arranged from light emergence face 1e.And, on the 1b of this side,, white adhesive tape etc. is housed prevents leak part in order to prevent the leakage of light.
As the material of light guide plate 1, can from translucent material, select, use propenyl or polycarbonate resin usually.Light guide plate be shaped as parallel flat and section plate wedge, its thickness is generally about 1～10mm.
In addition, as other translucent material, but can use the acrylate of polymethylmethacrylate, polyacrylic acid methyl etc. or methacrylate etc. separately or transparent resin, clear glass, crystalline ceramics etc. such as the acrylate of the crosslinked polyfunctional polyurethane-acrylate of thermoplastic resin such as the polyester of copolymer, polyethylene terephthalate, polybutyleneterephthalate etc., polycarbonate, polystyrene, poly-methyl butene or ultraviolet ray or electron ray, polyester acrylate etc., unsaturated polyester (UP).
Below, the action of light guide plate of the present invention is described with reference to Fig. 2.
Outdoor sunshine or indoor outer light such as fluorescent light, the outer light that is incident on light guide plate 1 is taken on the part 1a.Being taken into by the outer light that makes this outer light be taken into part 1a and facing obliquely upward, be taken into part (with reference to Fig. 1) relatively with the outer light of in the past light guide plate, is that the outer light of center incident is taken into outer light expeditiously and is taken into part 1a with the oblique upper direction.Its result, under the situation of the liquid crystal indicator of being furnished with light guide plate of the present invention as view finder etc., owing under the degree that needn't put bright light source, can throw light on fully, so can realize the reduction of consumed power.
In addition, under the situation of a bright light source, with two side 1b reflections of light reflection surface 1d and light guide plate 1 light and outer light from light source from light entrance face 1c incident, from light emergence face 1e as the synthetic light ejaculation that even directivity is arranged.
Fig. 3 is the synoptic diagram of expression area source of the present invention.
The 2nd, area source is made of light sources 3 such as light guide plate 1 of the present invention, fluorescent tube and various control circuit (not shown)s etc.In this control circuit, also comprise the total amount that for example detects the light that penetrates from the light emergence face of light guide plate 1, adjust the circuit that the power of supplying with on the light source 3 makes quantity of light emission become best.
The light that penetrates from light source 3 is reflected by reflecting body 4, enter the inside of light guide plate 1 from the light entrance face 1c of light guide plate 1, in addition, outer light such as natural light is taken into the inside that part 1a enters light guide plate 1 from the outer light of light guide plate 1, be used in the reflecting plate 5 and the side end face 1b that install light reflection surface 1d bottom and carry out reflecting condensation repeatedly, penetrate to diffuser plate 6 from the light emergence face 1e of light guide plate 1.In addition, utilize the isotropically diffusion equably in the desired angle scope of diffuser plate 6 and lens 7, penetrate from lens 7 to the light of diffuser plate 6 incidents.
Fig. 4 is the synoptic diagram that expression is furnished with the liquid crystal indicator of area source of the present invention.
The 8th, liquid crystal indicator is made of liquid crystal display 9 and area source of the present invention 2.Isotropically spread the light that penetrates equably from above-mentioned area source 2 and be imported into liquid crystal display 9.But, also can be to remove light source 3 from area source 2, only be used to liquid crystal indicator from the outer light of light guide plate 1.
As described above, according to light guide plate of the present invention, because this outer light is taken into the outer light of part and is taken into the direction of face towards ' oblique upper ', so can be taken into outer light best from oblique upper, but and since also incident from directly over and the outer light of positive side, make it become possibility so be taken into outer light such as sunshine and room light expeditiously as main light.
In addition,, improve owing to use above-mentioned light guide plate to make outer light be taken into efficient according to area source of the present invention and liquid crystal indicator, thus under the situation that obtains certain quantity of light emission, not only can reduce the power of supplying with to light source, and shouldn't light source according to purposes.
Claims (3)
1. a light guide plate is shaped integratedly with resin, it is characterized in that, the top of described light guide plate one end be furnished be taken into outside the outer light of light be taken into part, the outer light that described outer light is taken into part is taken into and faces obliquely upward.
2. an area source is characterized in that, is furnished with the light source of installing on light guide plate as claimed in claim 1 and the face beyond the outer light of described light guide plate is taken into part and light emergence face.
3. a liquid crystal indicator is characterized in that, the liquid crystal display of being furnished with light guide plate as claimed in claim 1 and installing near the light emergence face of described light guide plate.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP300444/1997 | 1997-10-31 | ||
| JP300444/97 | 1997-10-31 | ||
| JP9300444A JPH11133237A (en) | 1997-10-31 | 1997-10-31 | Light transmission plate, surface light source and liquid crystal display device using the light transmission plate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1216370A CN1216370A (en) | 1999-05-12 |
| CN1145836C true CN1145836C (en) | 2004-04-14 |
Family
ID=17884883
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB981214355A Expired - Fee Related CN1145836C (en) | 1997-10-31 | 1998-10-30 | Light conducting plate, and area source and liquid crystal display device using the same light conducting plate |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPH11133237A (en) |
| KR (1) | KR100277154B1 (en) |
| CN (1) | CN1145836C (en) |
| TW (1) | TW432251B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100395620C (en) * | 2004-12-30 | 2008-06-18 | 鸿富锦精密工业（深圳）有限公司 | Plate for guiding light, and backlight module of using the plate |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002133907A (en) * | 2000-10-25 | 2002-05-10 | Seiko Epson Corp | Illumination apparatus and liquid crystal device using it |
| KR100883098B1 (en) * | 2002-04-26 | 2009-02-11 | 삼성전자주식회사 | Back light assembly and liquid crystal display device using the same |
| JP5784769B2 (en) * | 2014-02-12 | 2015-09-24 | ミネベア株式会社 | Surface lighting device |
| CN104391350B (en) * | 2014-11-26 | 2018-01-16 | 深圳市华星光电技术有限公司 | A kind of light guide plate and backlight module |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6347297U (en) * | 1986-09-10 | 1988-03-30 | ||
| JP3033980B2 (en) * | 1989-05-31 | 2000-04-17 | 松下電工株式会社 | Indoor lighting fixtures |
-
1997
- 1997-10-31 JP JP9300444A patent/JPH11133237A/en active Pending
-
1998
- 1998-09-11 TW TW087115141A patent/TW432251B/en not_active IP Right Cessation
- 1998-10-30 CN CNB981214355A patent/CN1145836C/en not_active Expired - Fee Related
- 1998-10-30 KR KR1019980046347A patent/KR100277154B1/en not_active IP Right Cessation
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100395620C (en) * | 2004-12-30 | 2008-06-18 | 鸿富锦精密工业（深圳）有限公司 | Plate for guiding light, and backlight module of using the plate |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1216370A (en) | 1999-05-12 |
| TW432251B (en) | 2001-05-01 |
| JPH11133237A (en) | 1999-05-21 |
| KR19990037537A (en) | 1999-05-25 |
| KR100277154B1 (en) | 2001-01-15 |
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| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |