JPS6368815A - Backlighting structure for liquid crystal display device - Google Patents
Backlighting structure for liquid crystal display deviceInfo
- Publication number
- JPS6368815A JPS6368815A JP61214804A JP21480486A JPS6368815A JP S6368815 A JPS6368815 A JP S6368815A JP 61214804 A JP61214804 A JP 61214804A JP 21480486 A JP21480486 A JP 21480486A JP S6368815 A JPS6368815 A JP S6368815A
- Authority
- JP
- Japan
- Prior art keywords
- light source
- linear light
- display device
- liquid crystal
- crystal display
- 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.)
- Pending
Links
- 239000004973 liquid crystal related substance Substances 0.000 title claims description 7
- 230000004907 flux Effects 0.000 abstract description 6
- 238000000034 method Methods 0.000 description 3
- 241000252233 Cyprinus carpio Species 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000005338 frosted glass Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
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
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Liquid Crystal (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
- Light Guides In General And Applications Therefor (AREA)
Abstract
Description
【発明の詳細な説明】
〈産業上の利用分野〉
未発明は液晶テレビ等に用いられる液晶表示装置を照明
するためのバックライトの構造Ｅこ関する。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a structure E of a backlight for illuminating a liquid crystal display device used in a liquid crystal television or the like.
〈発明の概要〉
未発明は、液晶表示装置のバックライト構造として、表
示装置の中央背後に設けた線状光源力）らの光を透明体
ヲ介して前方へ導くようｌこしたものにおいて、線状光
源の直前部の透明体前面に光源と平行な溝部を刻設し、
光源直前部の高輝度光束を効率良く均一化できるように
したものである。<Summary of the Invention> The present invention provides a backlight structure for a liquid crystal display device in which light from a linear light source provided behind the center of the display device is guided forward through a transparent body. A groove parallel to the light source is carved on the front of the transparent body just in front of the linear light source.
This makes it possible to efficiently uniformize the high-intensity light flux immediately in front of the light source.
〈従来の技術〉
従来、ライトガイドとしては第３図のような比較的奥行
きの深め樋状の凹面鏡１０内番こ蛍光灯等の線状光源、
ｌを配した型が用いられていたが、この構造は光が均一
に発せられる利点があるが、奥行きが厚くなるという欠
点を有する。<Prior art> Conventionally, as a light guide, a linear light source such as a fluorescent lamp or the like is used as a light guide.
A type with an L shape has been used, but this structure has the advantage of emitting light uniformly, but has the disadvantage of being thick.
このため、第４図のよう番こ下側ｌこ斜面が形成された
透光板の側部１こ、光源ｌを配した型が用いられるよう
になった。しかし、この型では薄型化、輝度均一化には
有効であるが、光源からの光の利用効率が悪いとりう欠
点を有する。。For this reason, a mold, as shown in FIG. 4, has come to be used in which a light source is placed on one side of a light-transmitting plate on which a beveled surface is formed on the lower side. However, although this type is effective in reducing the thickness and making the brightness uniform, it has the drawback that it is inefficient in utilizing light from the light source. .
次に、第５図に示したものは第３図の構造を薄型化した
ものを示す。この型では、薄型化のためｋこ上方へ発せ
ら、れる光の輝度分布が、第６図、に示すように光源の
真上だけが高くなるという欠点を有する。Next, FIG. 5 shows a thinner version of the structure shown in FIG. 3. This type has the disadvantage that the luminance distribution of the light emitted upwards is high only directly above the light source, as shown in FIG. 6, due to its thin design.
この対応策として、第７図のように拡散板８の厚みを変
化させる方法や、第８図のように透明板に中央部付近だ
け密度の高め金属蒸竺ヲ施したライティングカーテンと
呼ばれる調光板Ｅこよって均−化する方法が用いられて
いるが、いずれも高輝度光束を減衰させるようにしたも
のであるため光の利用効率が低下するという欠点があっ
た。As a countermeasure for this, there is a method of changing the thickness of the diffuser plate 8 as shown in Figure 7, and a light control method called a lighting curtain in which a transparent plate is coated with metal sintered wire with a higher density near the center as shown in Figure 8. Methods of equalization using plate E have been used, but all of them are designed to attenuate high-intensity light fluxes, so they have the drawback of decreasing light utilization efficiency.
〈発明が解決しようとする問題点〉
従って、上記介挿従来例ではそのいずれの方式にも一長
一短があり、光の有効利用と均一化を両立させることが
できなかった。<Problems to be Solved by the Invention> Therefore, in the above-mentioned conventional examples of insertion, each of the systems has advantages and disadvantages, and it was not possible to achieve both effective use of light and uniformity.
〈問題点を解決するための手段〉
未発明では、表示装置の中央背後に設けた線状光源から
の光を透明体を介して前方へ導くようにしたものにおい
て、線状光源の直前部の透明体前面に光源と平行な溝部
を刻設している。<Means for solving the problem> In an uninvented device, in which light from a linear light source provided behind the center of a display device is guided forward through a transparent body, A groove parallel to the light source is carved on the front surface of the transparent body.
く作 用〉
従って、線状光源の直前部の高輝度光束を両側へ導いた
後、前方へ反射させることができる。Function: Therefore, the high-intensity light flux immediately in front of the linear light source can be guided to both sides and then reflected forward.
〈実施例〉 未発明を第１図、第２図にお論て説明する。<Example> The uninvention will be explained by referring to FIGS. 1 and 2.
ａ、第１実施例
第１図はバックライト構造の横断面を示して１／１７）
。a, 1st embodiment Figure 1 shows a cross section of the backlight structure (1/17)
.
この図におりで、■は直管型蛍光灯等からなる線状光源
、２は略放物曲線状の断面形状を有する下部反射板、３
は透明板であり、その断面形状は上辺が平担な偏平逆台
形をしており、７はその斜面であり、この斜面７の表面
はフレネル加工、ヘアーライン加工又はマント加工を施
しである。さら番こ透明板３の上面中央部ｌこは線状光
源ｌの上部を覆うようにＶ字型の溝部４を刻設し、この
溝部４の角度５は直下からの光線を全反射させうる角度
Ｅこ設定し、さらに溝部４の幅ｄは線状光源ｌの直径よ
り若干広く設定する。８はすりガラス状の拡散板である
。図示してｂないが拡散板８の上側（こ液晶表示板を取
付ける。In this figure, ■ is a linear light source such as a straight tube fluorescent lamp, 2 is a lower reflector having a substantially parabolic cross-sectional shape, and 3
is a transparent plate, and its cross-sectional shape is a flat inverted trapezoid with a flat upper side, and 7 is an inclined surface, and the surface of this inclined surface 7 is subjected to Fresnel processing, hairline processing, or mantle processing. A V-shaped groove 4 is carved in the center of the upper surface of the transparent plate 3 so as to cover the upper part of the linear light source 1, and the angle 5 of this groove 4 can completely reflect the light rays from directly below. The angle E is set, and the width d of the groove portion 4 is set slightly wider than the diameter of the linear light source l. 8 is a frosted glass diffuser plate. Although not shown in the figure, the upper side of the diffuser plate 8 (this is where the liquid crystal display panel is attached).
次にこの実施例の作用について説明する。Next, the operation of this embodiment will be explained.
線状光源ｌより発せられた光の内、側方及び下方に発せ
られたものは下部反射板２により上方へ反射され、透明
板３及び拡散板８を通過して上方へ発せられる。線状光
源ｌの上方に発せられた光は透明板３内に入った後、上
面の溝部４の内面で全反射され、透明板３内の両側へ導
ひかれ、さらに斜面７の内面で上方へ乱反射され、拡散
板８を通過して上方へ発せられる。これにより、線状光
源ｌの真上の高輝度光束は分散された後、上方へ発せら
れるため、線状光源１の光は効率良く均一化される。Of the light emitted from the linear light source 1, the light emitted laterally and downward is reflected upward by the lower reflector 2, passes through the transparent plate 3 and the diffuser plate 8, and is emitted upward. After the light emitted upward from the linear light source l enters the transparent plate 3, it is totally reflected on the inner surface of the groove 4 on the top surface, guided to both sides of the transparent plate 3, and then upwards on the inner surface of the slope 7. The light is diffusely reflected, passes through the diffuser plate 8, and is emitted upward. Thereby, the high-intensity light beam directly above the linear light source 1 is dispersed and then emitted upward, so that the light from the linear light source 1 is efficiently uniformized.
ｂ、第２実施例 第２図はバックライト構造の横断面を示している。b. Second embodiment FIG. 2 shows a cross section of the backlight structure.
この図（こおりて、１は線状光源、８は拡散板である。In this figure, 1 is a linear light source and 8 is a diffuser plate.
６は透明プラスチック等からなる透明体で、全体が蒲鯉
型をしており、下部中央ｌこ線状光源ｌを入れるための
Ｖ字型の溝部１０を刻設し、上部中央には第１図の溝部
４と同様の角度及び幅のＶ字型の溝部９全刻設し、さら
に下側曲面部の表面にはアルミ蒸着等による反射処理を
施している。Reference numeral 6 is a transparent body made of transparent plastic or the like, which is shaped like a carp as a whole, with a V-shaped groove 10 carved in the center of the lower part for inserting the linear light source l, and a first groove part 10 in the center of the upper part. A V-shaped groove 9 having the same angle and width as the groove 4 shown in the figure is entirely carved, and the lower curved surface is subjected to a reflective treatment such as aluminum vapor deposition.
次にこの実施例の作用について説明する。Next, the operation of this embodiment will be explained.
線状光源ｌより側方へ発せられた光は透明体６の下側曲
面部で上方へ反射され、拡散板８を通過して上方へ発せ
られる。線状光源１の上方＆Ｃ発せられた光は溝部９の
内面で全反射され、さら（こ透明体６の下側曲面部の内
面で上方へ反射され、拡散板８を通過して上方へ発せら
れる。The light emitted laterally from the linear light source 1 is reflected upward by the lower curved surface of the transparent body 6, passes through the diffuser plate 8, and is emitted upward. The light emitted upward & C from the linear light source 1 is totally reflected by the inner surface of the groove 9, and further reflected upward by the inner surface of the lower curved surface of the transparent body 6, passes through the diffuser plate 8, and is emitted upward. It will be done.
なお、上記各実施例では溝部４及び９ｋＶ字状Ｅこ刻設
しているが、Ｕ字状や半円状に形成してもよい。In each of the above embodiments, the groove portion 4 is formed in a 9kV-shaped E-shape, but it may be formed in a U-shape or a semicircular shape.
〈発明の効果〉
未発明では、線状光源の直前部の高輝度光束を両側へ導
１ｔｒｆ後、前方へ反射させることにより。<Effects of the Invention> In the present invention, the high-intensity luminous flux immediately in front of the linear light source is guided to both sides and then reflected forward.
光の有効利用と均一化を両立させることができる。It is possible to achieve both effective use and uniformity of light.
第１図は大発明の第１実施例のバックライト構造の横断
面図、
第２図は大発明の第２実施例のバックライト構造の横断
面図。
第３図は第１従来例のバックライト構造の横断面図。
第４図は第２従来例のバックライト構造の横断面図、
第５図は第３従来例のバックライト構造の横断面図、
第６図は第３従来例の輝度分布図。
第７図は第３従来例で輝度均一化に用いられる拡散板の
横断面図。
第８図は第７図のものと同様の目的に用いられるライテ
ィングカーテンの平面図である。
ｌ二線状光源、３：透明板、４二溝部、６：透明体、７
：斜面、８：拡散板、９：溝部、ＩＯ＝溝部。
代理人 弁理士 杉 山 毅 至（他１名）第１図
第３図
第５図
第２図
第４図
第６図FIG. 1 is a cross-sectional view of a backlight structure according to a first embodiment of the great invention, and FIG. 2 is a cross-sectional view of a backlight structure according to a second embodiment of the great invention. FIG. 3 is a cross-sectional view of the backlight structure of the first conventional example. FIG. 4 is a cross-sectional view of the backlight structure of the second conventional example, FIG. 5 is a cross-sectional view of the backlight structure of the third conventional example, and FIG. 6 is a luminance distribution diagram of the third conventional example. FIG. 7 is a cross-sectional view of a diffuser plate used to equalize brightness in a third conventional example. FIG. 8 is a plan view of a lighting curtain used for a purpose similar to that of FIG. l Two-line light source, 3: Transparent plate, 4 Two grooves, 6: Transparent body, 7
: slope, 8: diffuser plate, 9: groove, IO=groove. Agent Patent Attorney Takeshi Sugiyama (and 1 other person) Figure 1 Figure 3 Figure 5 Figure 2 Figure 4 Figure 6
Claims (1)
状光源からの光を前方へ導くよう介される透明体を備え
、前記透明体の前記表示装置側平担面に前記線状光源と
平行な溝部を刻設してなる液晶表示装置のバックライト
構造。1. A linear light source is disposed behind the center of the liquid crystal display device, and a transparent body is provided to guide light from the linear light source forward, and the linear light source is provided on a flat surface of the transparent body facing the display device. The backlight structure of a liquid crystal display device is made by carving a groove parallel to the light source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61214804A JPS6368815A (en) | 1986-09-09 | 1986-09-09 | Backlighting structure for liquid crystal display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61214804A JPS6368815A (en) | 1986-09-09 | 1986-09-09 | Backlighting structure for liquid crystal display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6368815A true JPS6368815A (en) | 1988-03-28 |
Family
ID=16661801
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61214804A Pending JPS6368815A (en) | 1986-09-09 | 1986-09-09 | Backlighting structure for liquid crystal display device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6368815A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02208631A (en) * | 1989-02-08 | 1990-08-20 | Copal Co Ltd | Surface light emission body device for lighting liquid crystal display element |
| JPH02293789A (en) * | 1989-05-02 | 1990-12-04 | Sharp Corp | Back light device |
| JPH0336523A (en) * | 1989-07-03 | 1991-02-18 | Sharp Corp | Plane light source device |
| WO2010082262A1 (en) * | 2009-01-16 | 2010-07-22 | 株式会社ナナオ | Image display apparatus |
| JP2012018274A (en) * | 2010-07-07 | 2012-01-26 | Panasonic Liquid Crystal Display Co Ltd | Liquid crystal display device |
-
1986
- 1986-09-09 JP JP61214804A patent/JPS6368815A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02208631A (en) * | 1989-02-08 | 1990-08-20 | Copal Co Ltd | Surface light emission body device for lighting liquid crystal display element |
| JPH02293789A (en) * | 1989-05-02 | 1990-12-04 | Sharp Corp | Back light device |
| JPH0336523A (en) * | 1989-07-03 | 1991-02-18 | Sharp Corp | Plane light source device |
| WO2010082262A1 (en) * | 2009-01-16 | 2010-07-22 | 株式会社ナナオ | Image display apparatus |
| JP4519201B1 (en) * | 2009-01-16 | 2010-08-04 | 株式会社ナナオ | Image display device |
| JP2010237688A (en) * | 2009-01-16 | 2010-10-21 | Nanao Corp | Image display apparatus |
| KR101233882B1 (en) * | 2009-01-16 | 2013-02-15 | 가부시키가이샤 나나오 | Image display apparatus |
| US8654443B2 (en) | 2009-01-16 | 2014-02-18 | Eizo Nanao Corporation | Image display apparatus |
| JP2012018274A (en) * | 2010-07-07 | 2012-01-26 | Panasonic Liquid Crystal Display Co Ltd | Liquid crystal display device |
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