JPH0125965Y2 - - Google Patents
Info
- Publication number
- JPH0125965Y2 JPH0125965Y2 JP1983135800U JP13580083U JPH0125965Y2 JP H0125965 Y2 JPH0125965 Y2 JP H0125965Y2 JP 1983135800 U JP1983135800 U JP 1983135800U JP 13580083 U JP13580083 U JP 13580083U JP H0125965 Y2 JPH0125965 Y2 JP H0125965Y2
- Authority
- JP
- Japan
- Prior art keywords
- light
- light source
- liquid crystal
- crystal display
- display panel
- 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
Links
- 239000004973 liquid crystal related substance Substances 0.000 claims description 15
- 230000005540 biological transmission Effects 0.000 claims description 3
- 230000007423 decrease Effects 0.000 claims 1
- 239000010408 film Substances 0.000 description 6
- 238000005286 illumination Methods 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 229920003002 synthetic resin Polymers 0.000 description 5
- 239000000057 synthetic resin Substances 0.000 description 5
- 239000011521 glass Substances 0.000 description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 2
- 238000000149 argon plasma sintering Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229920003217 poly(methylsilsesquioxane) Polymers 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000007772 electroless plating Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Landscapes
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
- Illuminated Signs And Luminous Advertising (AREA)
Description
【考案の詳細な説明】
〈技術分野〉
本考案は、受動型表示装置、特に液晶表示装置
に用いられるライトボツクスに関するものであ
る。[Detailed Description of the Invention] <Technical Field> The present invention relates to a light box used in a passive display device, particularly a liquid crystal display device.
〈従来技術〉
表示装置は、一般に能動型（発光型）と受動型
（非発光型）に大別することができる。能動型
（発光型）とは、発光ダイオード、プラズマデイ
スプレイ、エレクトロルミネツセントデイスプレ
イ等のように自ら光を発することにより表示を行
なうものである。これに対して受動型は、液晶表
示装置（以下LCDと略す）あるいはエレクトロ
クロミツク表示装置等の様に自らは発光せず、光
の透過率あるいは反射率を制御することにより、
自然光や他の照明源からの照射光を変調し、パタ
ーン表示を行なうものである。従つて、受動型は
周囲が暗い場合には照明手段を設けないと表示が
見難くなるという問題点を有している。<Prior Art> Display devices can generally be broadly classified into active types (light-emitting types) and passive types (non-light-emitting types). The active type (light-emitting type) is one that performs display by emitting its own light, such as a light emitting diode, plasma display, or electroluminescent display. On the other hand, passive types, such as liquid crystal display devices (hereinafter abbreviated as LCD) or electrochromic display devices, do not emit light themselves, but instead display light by controlling the transmittance or reflectance of light.
It modulates the light emitted from natural light or other illumination sources to display patterns. Therefore, the passive type has the problem that the display becomes difficult to see unless lighting means is provided when the surroundings are dark.
LCDは消費電力が少ないという特徴を有して
おり、電卓、腕時計等の携帯用電子機器に広汎に
活用されている。しかし、大部分のLCDの表示
モードは液晶の光学的異方性を利用するものであ
るため、偏光板を重ね合わせることが不可欠の構
成要素となつており、この偏光板のために照明光
の50％はカツトされてしまう。特にカラーフイル
ターを用いた液晶表示装置ではカラー化のために
さらに光量が減少するので一般的な使用状況では
照明手段を備えることが必須の要件になる。携帯
用電子機器では電源の制約が大きく、従つて少な
い消費電力でいかに明るい照明手段を得るかが表
示装置を製作する上での課題となる。 LCDs are characterized by low power consumption and are widely used in portable electronic devices such as calculators and wristwatches. However, since the display mode of most LCDs utilizes the optical anisotropy of liquid crystals, superimposing polarizing plates is an essential component, and this polarizing plate makes it difficult to control the illumination light. 50% will be cut. In particular, in a liquid crystal display device using a color filter, the amount of light is further reduced due to colorization, so it is essential to provide an illumination means under general usage conditions. Portable electronic devices are highly constrained by power supplies, and the challenge in manufacturing display devices is therefore how to obtain bright illumination means with low power consumption.
従来、上述の照明手段として用いられてきたラ
イトボツクスは次のようなものである。光源には
白熱豆電球や蛍光灯が用いられ、光源と表示パネ
ルとの間に、照明面の輝度を面全体にわたつて均
一にさせるために光散乱効果を有する乳白色のガ
ラスあるいは合成樹脂板からなる拡散透過板が設
けられる。また反射板としては鏡面反射板もしく
は光散乱アクリル板が用いられている。この反射
板は、光源から発して背面に向かう光を反射させ
て前面に導くことにより、光の利用率を向上する
ために設けられている。しかしながら、反射板と
して鏡面のものを使用すると、輝度のムラが生じ
易くなる。一方、拡散透過板と同様の乳白色のガ
ラスあるいは合成樹脂板を使用すると、かなりの
量の光が、背面に放散され、前面方向の輝度の向
上に寄与する割合が低下するという欠点を有す
る。 The light boxes conventionally used as the above-mentioned illumination means are as follows. Incandescent miniature bulbs or fluorescent lamps are used as the light source, and a milky-white glass or synthetic resin plate with a light scattering effect is placed between the light source and the display panel to make the brightness of the illumination surface uniform over the entire surface. A diffuser-transmitting plate is provided. Further, as the reflecting plate, a specular reflecting plate or a light scattering acrylic plate is used. This reflective plate is provided to improve the efficiency of light utilization by reflecting light emitted from the light source and directed toward the back surface and guiding it toward the front surface. However, when a reflective plate with a mirror surface is used, unevenness in brightness tends to occur. On the other hand, if a milky white glass or synthetic resin plate similar to the diffuse transmitting plate is used, a considerable amount of light will be diffused to the back side, which has the disadvantage that the proportion that contributes to improving the brightness in the front direction will be reduced.
〈考案の目的〉
本考案は、上述の問題点に鑑み、反射率の高い
拡散反射板を光源の背後に設け、光源の前面には
輝度均一化スクリーンを設けることにより光源の
発した光を有効に利用した明るいライトボツクス
を提供することを目的とする。<Purpose of the invention> In view of the above-mentioned problems, the present invention effectively utilizes the light emitted by the light source by providing a diffuse reflector with a high reflectance behind the light source and a brightness equalization screen in front of the light source. The purpose is to provide bright light boxes that can be used for.
〈実施例〉
第１図は本考案の１実施例を示すライトボツク
スの構成図である。<Embodiment> FIG. 1 is a block diagram of a light box showing one embodiment of the present invention.
光源１の前面側に拡散透過板２、背面側に拡散
反射板３が配置され、光源１と拡散透過板２の間
には輝度均一化のためのスクリーン４が介設され
ている。また拡散透過板２の前方には液晶表示パ
ネル５が設置される。 A diffuse transmitting plate 2 is arranged on the front side of the light source 1, and a diffuse reflecting plate 3 is arranged on the rear side, and a screen 4 is interposed between the light source 1 and the diffuse transmitting plate 2 for uniform brightness. Further, a liquid crystal display panel 5 is installed in front of the diffuser-transmitting plate 2.
光源１としては、白熱電球、蛍光灯あるいはエ
レクトロルミネツセンス発光灯が用いられ、拡散
透過板２としては乳白色のガラスあるいは合成樹
脂板その他が実施に供される。また、拡散反射板
３としては分光光度計（島津UV−200）と積分
球により求められる適宜の反射率を有する次のよ
うな部材が用いられる。 As the light source 1, an incandescent lamp, a fluorescent lamp, or an electroluminescent lamp is used, and as the diffuser-transmitting plate 2, milky white glass, a synthetic resin plate, or the like is used. Further, as the diffuse reflection plate 3, the following member having an appropriate reflectance determined by a spectrophotometer (Shimadzu UV-200) and an integrating sphere is used.
(1) 粗面化されたAl等の金属板…反射率70％
(2) 粗面化された合成樹脂フイルム上に無電解メ
ツキまたはスパツタ法によりAl等の金属薄膜
を設けたもの…反射率76％
(3) 合成樹脂フイルムにAl等の金属粉末顔料を
塗布したもの…反射率83％
上記いずれの部材を用いても可視域での反射率
はほぼ平坦であつた。尚、従来の乳白色アクリル
板（１mm厚）を用いたものでは、反射率は55％で
あつた。(1) Roughened metal plate such as Al...reflectance 70% (2) Roughened synthetic resin film with a thin metal film such as Al formed by electroless plating or sputtering method...reflectance 76% (3) Synthetic resin film coated with metal powder pigment such as Al...reflectance 83% No matter which member was used, the reflectance in the visible range was almost flat. Incidentally, when a conventional milky white acrylic plate (1 mm thick) was used, the reflectance was 55%.
スクリーン４は輝度の分布を均一化するために
光源１と拡散透過板２との間に設けられるもので
ある。このスクリーン４は第２図に示す如く透明
フイルム上にAl等の金属薄膜を設けたものであ
る。金属薄膜はモザイク状または網目写真状にパ
ターン化されており、入射光の一部が反射され、
残りは透過する。この場合の光の透過する割合
は、光源１に近い領域では反射面の面積比率を透
過面より大きく設定し、光源１から遠ざかるに従
つて反射面の面積比率を小さく透過面の面積比率
を大きくすることによつて、液晶表示パネル５の
表示面での輝度均一化を達成するように調整され
ている。反射面、透過面の面積比率は透明フイル
ム上に貼着される金属薄膜の密度によつて定ま
り、面積比率に応じて透過光量が制御設定され
る。スクリーン４で反射された光は背面側の拡散
反射板３で反射され、再びスクリーン４に入射さ
れる。スクリーン４を透過した光は液晶表示パネ
ル５に入射され、液晶表示パネル５で均一な輝度
の表示が実行される。 The screen 4 is provided between the light source 1 and the diffuser-transmitting plate 2 in order to make the distribution of brightness uniform. As shown in FIG. 2, this screen 4 has a thin metal film such as Al on a transparent film. The metal thin film is patterned in a mosaic or mesh pattern, and a portion of the incident light is reflected.
The rest will be transparent. In this case, the rate of light transmission is determined by setting the area ratio of the reflective surface to be larger than that of the transmitting surface in the area close to light source 1, and decreasing the area ratio of the reflective surface and increasing the area ratio of the transmitting surface as you move away from light source 1. By doing so, the brightness is adjusted to be uniform on the display surface of the liquid crystal display panel 5. The area ratio of the reflective surface and the transmitting surface is determined by the density of the metal thin film adhered on the transparent film, and the amount of transmitted light is controlled and set according to the area ratio. The light reflected by the screen 4 is reflected by the diffuse reflection plate 3 on the back side and enters the screen 4 again. The light transmitted through the screen 4 is incident on the liquid crystal display panel 5, and the liquid crystal display panel 5 displays a display with uniform brightness.
〈考案の効果〉
本考案により、光源からの出力光は、背面に設
けられた拡散反射板によつて液晶表示パネルの方
向へ無駄なく反射され、また液晶表示パネルとの
間に設けられたスクリーンによつて輝度が均一に
された後、拡散されて液晶表示パネルへ入射され
るため、光源からの出力光の利用効率が高く均一
な輝度で明るい表示を実行することのできる表示
装置用ライトボツクスが得られる。<Effects of the invention> According to the invention, the output light from the light source is reflected toward the liquid crystal display panel without waste by the diffuse reflection plate provided on the back side, and the light output from the light source is reflected without waste in the direction of the liquid crystal display panel. A light box for display devices that uses the output light from the light source with high efficiency and can perform bright displays with uniform brightness because the brightness is made uniform by the light source and then diffused before entering the liquid crystal display panel. is obtained.
第１図は本考案の１実施例を示すライトボツク
スの構成図である。第２図はスクリーンの細部を
詳細に示す要部拡大図である。
１……光源、２……拡散透過板、３……拡散反
射板、４……スクリーン、５……液晶表示パネ
ル。
FIG. 1 is a block diagram of a light box showing one embodiment of the present invention. FIG. 2 is an enlarged view of the main part showing details of the screen. 1...Light source, 2...Diffuse transmission plate, 3...Diffuse reflection plate, 4...Screen, 5...Liquid crystal display panel.
Claims (1)
と、 該光源の前面側と前記液晶表示パネルとの間に
設けられたスクリーンと、 前記光源の背面側に設けられた拡散反射板と、 を備え、 前記スクリーンは、前記光源から遠ざかるに従
つて反射面の面積比率を小さく、透過面の面積比
率を大きく設定してなることを特徴とする表示装
置用ライトボツクス。[Claims for Utility Model Registration] A liquid crystal display panel; a light source provided on the back side of the liquid crystal display panel; a screen provided between the front side of the light source and the liquid crystal display panel; A display comprising: a diffuse reflection plate provided on the back side; and the screen is configured such that the area ratio of the reflective surface decreases and the area ratio of the transmission surface increases as the distance from the light source increases. Light box for equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13580083U JPS6044076U (en) | 1983-08-31 | 1983-08-31 | Light box for display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13580083U JPS6044076U (en) | 1983-08-31 | 1983-08-31 | Light box for display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6044076U JPS6044076U (en) | 1985-03-28 |
| JPH0125965Y2 true JPH0125965Y2 (en) | 1989-08-03 |
Family
ID=30305539
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13580083U Granted JPS6044076U (en) | 1983-08-31 | 1983-08-31 | Light box for display device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6044076U (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH082707Y2 (en) * | 1988-07-31 | 1996-01-29 | エスアンドエフ株式会社 | Lighting panel |
| FI108576B (en) * | 2000-04-28 | 2002-02-15 | Fortum Oyj | Method and apparatus for changing the radiation intensity distribution of a radiation source |
| JP5631776B2 (en) * | 2010-03-03 | 2014-11-26 | 株式会社東芝 | LIGHTING DEVICE AND LIQUID CRYSTAL DISPLAY DEVICE HAVING THE SAME |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5118533A (en) * | 1974-08-06 | 1976-02-14 | Ono Gijutsu Kenkyusho Jugen | |
| JPS52142996A (en) * | 1976-05-20 | 1977-11-29 | Ebauches Sa | Passive optooelectric indicator |
| JPS5386597A (en) * | 1977-01-11 | 1978-07-31 | Toshiba Corp | Liquid display device mounting in cars |
| JPS5418886A (en) * | 1977-07-12 | 1979-02-13 | Mitsubishi Chem Ind Ltd | Production of olefin polymer |
| JPS5515126A (en) * | 1978-07-18 | 1980-02-02 | Ono Gijutsu Kenkyusho:Kk | Light unevenness removing member |
| JPS55133008A (en) * | 1979-04-03 | 1980-10-16 | Ono Gijutsu Kenkyusho:Kk | Thin type shaukasten |
| JPS5713478A (en) * | 1980-06-26 | 1982-01-23 | Epson Corp | Back light structure for display unit |
| JPS57165887A (en) * | 1981-03-13 | 1982-10-13 | Bosch Gmbh Robert | Apparatus for gradient-free lighting of passive display unit equipped with light source and method of making same |
| JPS5847884B2 (en) * | 1976-01-29 | 1983-10-25 | セイコーインスツルメンツ株式会社 | short side crystal oscillator |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53156480U (en) * | 1977-05-14 | 1978-12-08 | ||
| JPS55144371U (en) * | 1979-04-03 | 1980-10-16 | ||
| JPS56145078U (en) * | 1980-04-01 | 1981-11-02 | ||
| JPS5847884U (en) * | 1981-09-28 | 1983-03-31 | 株式会社東芝 | liquid crystal display device |
-
1983
- 1983-08-31 JP JP13580083U patent/JPS6044076U/en active Granted
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5118533A (en) * | 1974-08-06 | 1976-02-14 | Ono Gijutsu Kenkyusho Jugen | |
| JPS5847884B2 (en) * | 1976-01-29 | 1983-10-25 | セイコーインスツルメンツ株式会社 | short side crystal oscillator |
| JPS52142996A (en) * | 1976-05-20 | 1977-11-29 | Ebauches Sa | Passive optooelectric indicator |
| JPS5386597A (en) * | 1977-01-11 | 1978-07-31 | Toshiba Corp | Liquid display device mounting in cars |
| JPS5418886A (en) * | 1977-07-12 | 1979-02-13 | Mitsubishi Chem Ind Ltd | Production of olefin polymer |
| JPS5515126A (en) * | 1978-07-18 | 1980-02-02 | Ono Gijutsu Kenkyusho:Kk | Light unevenness removing member |
| JPS55133008A (en) * | 1979-04-03 | 1980-10-16 | Ono Gijutsu Kenkyusho:Kk | Thin type shaukasten |
| JPS5713478A (en) * | 1980-06-26 | 1982-01-23 | Epson Corp | Back light structure for display unit |
| JPS57165887A (en) * | 1981-03-13 | 1982-10-13 | Bosch Gmbh Robert | Apparatus for gradient-free lighting of passive display unit equipped with light source and method of making same |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6044076U (en) | 1985-03-28 |
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