JPS63271229A - Liquid crystal display device - Google Patents

Liquid crystal display device

Info

Publication number
JPS63271229A
JPS63271229A JP62104326A JP10432687A JPS63271229A JP S63271229 A JPS63271229 A JP S63271229A JP 62104326 A JP62104326 A JP 62104326A JP 10432687 A JP10432687 A JP 10432687A JP S63271229 A JPS63271229 A JP S63271229A
Authority
JP
Japan
Prior art keywords
liquid crystal
crystal display
light
led
luminescent
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
Application number
JP62104326A
Other languages
Japanese (ja)
Inventor
Saburo Watanabe
三郎 渡辺
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Hitachi Consumer Electronics Co Ltd
Japan Display Inc
Original Assignee
Hitachi Device Engineering Co Ltd
Hitachi Ltd
Hitachi Consumer Electronics Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Device Engineering Co Ltd, Hitachi Ltd, Hitachi Consumer Electronics Co Ltd filed Critical Hitachi Device Engineering Co Ltd
Priority to JP62104326A priority Critical patent/JPS63271229A/en
Publication of JPS63271229A publication Critical patent/JPS63271229A/en
Pending legal-status Critical Current

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
    • G02F1/133603—Direct backlight with LEDs
    • 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
    • G02F1/133613—Direct backlight characterized by the sequence of 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
    • G02F1/133621—Illuminating devices providing coloured light
    • G02F1/133622—Colour sequential illumination

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)

Abstract

PURPOSE:To easily obtain plural luminescent colors of the titled device by constituting the light source for a back light by plural light emitting diodes (LED) having different luminescent colors respectively and a diffusion means capable of diffusing the luminescent light of the LED to the titled device. CONSTITUTION:The titled device is provided with the liquid crystal display element 1, a frame like panel 5 arranging in front of the element 1 and having an opening in response to the effective display surface of the element 1, and the light source 10 for the back light. Said light source is constituted by the plural light emitting diodes (LED) having the different luminescent colors respectively and the diffusion means capable of diffusing the luminescent light of the LED to the liquid crystal display element 1. And, the luminescent light of the LED is optionally selected by a controlling means and is diffused to the rear surface of said element by the diffusion means. Thus, as the back light color of said element is freely changed, the multiple color luminescent display makes possible, and the distinguish etc. of the display due to a color is easily effected.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、各種のキャラクタディスプレイあるいはグラ
フィックディスプレイとして広く用いられる液晶表示装
置に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a liquid crystal display device widely used as various character displays or graphic displays.

〔従来の技術〕[Conventional technology]

従来よりこの種の液晶表示装置として液晶表示素子の後
方に発光ダイオード（以下ＬＥＤと称す）等の照明用光
源を配置したバックライト形の液晶表示装置が例えば特
開昭５８−１７８３８９号公報で提案されている。Conventionally, as this type of liquid crystal display device, a backlight type liquid crystal display device in which a light source for illumination such as a light emitting diode (hereinafter referred to as LED) is arranged behind a liquid crystal display element has been proposed, for example, in Japanese Patent Laid-Open No. 178389/1989. has been done.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

このよりなＬＥＤバンクライト形の構造において、ＬＥ
Ｄは輝度が小さく、面発光には不利であることから、従
来、ＬＥＤ光源の光を液晶表示素子の有効面全面にわた
って拡散させることについて多くの努力がなされている
が、光源の発光色については全く配慮されておらず、所
要の発光色の要請に対してその都度ＬＥＤを交換しなけ
ればならないという不都合カ問題がアシ、さらには近年
の液晶表示装置の多色発光表示の要請に対してその実現
が不可能であった。In this solid LED bank light type structure, the LED
Since D has low brightness and is disadvantageous for surface emitting, many efforts have been made to diffuse the light from the LED light source over the entire effective surface of the liquid crystal display element. There is no consideration at all, and there is the inconvenient problem of having to replace LEDs each time the required luminous color is required.Furthermore, there is no consideration given to the requirement for multicolor luminous display of liquid crystal display devices in recent years. It was impossible to realize this.

したがって本発明紘前述した従来の問題に鑑みてなされ
たものであシ、その目的は、複数の発光色が容易に得ら
れるバックライト形の液晶表示装置を提供することにあ
る。Therefore, the present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a backlight type liquid crystal display device that can easily produce a plurality of emitted colors.

〔問題点を解決するための手段〕[Means for solving problems]

本発明による液晶表示装置は、液晶表示素子のバックラ
イト用光源を、発光色の異なる複数のしＥＤと、このＬ
ＥＤの発色光を液晶表示素子に拡散させる拡散装置とか
ら構成するものである。The liquid crystal display device according to the present invention includes a plurality of EDs emitting light of different colors as a backlight light source of a liquid crystal display element, and the L
It is composed of a diffusion device that diffuses the colored light of the ED to the liquid crystal display element.

〔作用〕[Effect]

本発明においては、制御装置によＦ）ＬＥＤ　の発色光
を自由に設定し、拡散装置によシ液晶表示素子の背面に
拡散させる。In the present invention, the control device freely sets the colored light of F) the LED, and the diffuser diffuses it to the back side of the liquid crystal display element.

〔実施例〕〔Example〕

第１図は本発明による液晶表示装置の一実施例を示す断
面図である。同図において、互いに対向して配置された
液晶表示素子（以下素子と称する）１と半導体素子２を
搭載した駆動回路基板（以下基板と称する）３との間に
は、両者の電極端子対向間に導電性ゴム４を配置し、素
子１の有効表示面に対応し九開口をするパネル５により
挾持させ、導電性ゴム４の圧縮によシ素子１と基板３と
を電気的に接続させ、さらにこの素子１と基板３との間
にはバックライト用光源１０が配設されて構成されてい
る。FIG. 1 is a sectional view showing an embodiment of a liquid crystal display device according to the present invention. In the figure, between a liquid crystal display element (hereinafter referred to as an element) 1 and a drive circuit board (hereinafter referred to as a substrate) 3 on which a semiconductor element 2 is mounted, which are arranged facing each other, there is a gap between opposing electrode terminals of the two. A conductive rubber 4 is arranged on the panel 5, and the conductive rubber 4 is sandwiched by a panel 5 having nine openings corresponding to the effective display surface of the element 1, and the element 1 and the substrate 3 are electrically connected by compression of the conductive rubber 4. Further, a backlight light source 10 is arranged between the element 1 and the substrate 3.

第２図（、）　、　（ｂ）は前述したバックライト用光
源１０の一実施例を示す要部平面図、そのＢ　−Ｂ’線
の断面図である。同図において、プリント配線基板１１
０表面には、図示されないが、第３図に示すように１本
の共通導体配線１２ｅおよび３本の導体配線１２ｒ、１
２ｇ、１２ｂに対応する配線がパターン形成されている
。そして、このプリント配線基板１１上の共通導体配線
１２ｅと各導体配線１２ｒ、　１２ｓｒ＠１２ｂとの間
にはそれぞれ赤、緑、青色に発光するＬｚＤ１３ｒ、１
３ｇ５１３ｂからなる１組のＬＥＤ素踏３が各表示セグ
メント１４毎に多数組並列接続されている。この場合の
接続方法は、第２図（ｂ）に示すように赤色発光ｔ、ｇ
ｏ１ｓｒの場合で説明すると、導体配線１２ｒ上にＬＥ
０１３Ｆの一方の電極を直接ボンディングし、その他方
の電極は共通導体配線１２ｃとボンディングワイヤ１５
によシそれぞれ電気的に接続され、他色発光のｔ、Ｅｏ
１３ｇ、１３ｂも同様の手段で接続される。また、これ
ら多数組のＬＥＤ素子１３が搭載されたプリント配線基
板１１の周縁１１には、各導体配線１２ｒ＋１２ｇ、１
２ｂ、１２ｅに接続される電極端子１（ｉｒ、１６ｇ、
１６ｂ、１６ｅを露出させて樹脂モールドからなる枠状
のケース１１が接着配置され、このケース１７内には透
光性のシリコン樹脂が充填されて光拡散層１８が形成さ
れている。この場合、拡散層１８はケース１１の高さの
約７０〜８０チ程度の高さまで形成し、その上には空気
層１９が設けられている。また、このケース１７の上に
はポリエステルフィルムの表面を拡散処理した光拡散板
２０が接着配置されている。FIGS. 2(a) and 2(b) are a plan view of a main part of an embodiment of the above-mentioned backlight light source 10, and a cross-sectional view thereof taken along the line B-B'. In the same figure, printed wiring board 11
Although not shown, one common conductor wiring 12e and three conductor wirings 12r, 1
Wiring patterns corresponding to 2g and 12b are formed. Between the common conductor wiring 12e on the printed wiring board 11 and each conductor wiring 12r, 12sr@12b, there are LzDs 13r, 1 that emit red, green, and blue light, respectively.
A large number of sets of LED elements 3 made of 3g513b are connected in parallel for each display segment 14. The connection method in this case is as shown in Fig. 2(b).
To explain in the case of o1sr, there is an LE on the conductor wiring 12r.
One electrode of 013F is directly bonded, and the other electrode is connected to the common conductor wiring 12c and the bonding wire 15.
t and Eo, which are electrically connected to each other and emit light in other colors.
13g and 13b are also connected by similar means. Further, on the periphery 11 of the printed wiring board 11 on which these multiple sets of LED elements 13 are mounted, each conductor wiring 12r+12g, 1
Electrode terminal 1 (ir, 16g,
A frame-shaped case 11 made of a resin mold is adhesively arranged with the parts 16b and 16e exposed, and the inside of this case 17 is filled with a light-transmitting silicone resin to form a light diffusion layer 18. In this case, the diffusion layer 18 is formed to a height of approximately 70 to 80 inches higher than the height of the case 11, and an air layer 19 is provided above it. Further, on the case 17, a light diffusing plate 20 whose surface is made of a polyester film and which is subjected to diffusion treatment is adhesively arranged.

このように構成されたバックライト用光源１０は、第１
図に示す素子１の後方に配設され、共通電極端子１６ｃ
と各電極端子１６ｒ＋１６ｇｔ１６ｂとの間に選択的に
電流を供給することによシ、プリント配線基板１１上に
搭載されたそれぞれ赤、緑、青色発光ＬＥＤ１３ｒ、１
３ｇ、１３ｂが発光する。この発色光は拡散層１８．空
気層１９および拡散板２０によシ相互に乱反射されて十
分に光拡散され、素子１を透過して素子１に表示される
パターンの背面がカラー表示されることになる。また、
各電極端子１６ｒ、１６ｇ、１６ｂの複数を選択するこ
とによシ、混合色を得ることができ、さらに第３図に示
すように各電極端子１６　ｒ　ｔ　１６　ｇ　ｓ　１６
　ｂと駆動回路基板３の電源との間に電流可変抵抗器２
１　ｒ　＋　２１ｇ　ｍ　２１　ｂを接続し、適宜可変
することによシ、色の混合比を変えることができる。ま
たＬＥＤの配列方法については、本例はトライアングル
であるが、ライン状にＲＧＢ等、他の方式でも可能であ
る。The backlight light source 10 configured in this way has a first
A common electrode terminal 16c is disposed at the rear of the element 1 shown in the figure.
By selectively supplying current between the electrode terminals 16r+16gt16b, the red, green, and blue light-emitting LEDs 13r, 1 mounted on the printed wiring board 11 are
3g and 13b emit light. This colored light is transmitted through the diffusion layer 18. The light is diffusely reflected from each other by the air layer 19 and the diffuser plate 20 and is sufficiently diffused, and the back side of the pattern that is transmitted through the element 1 and displayed on the element 1 is displayed in color. Also,
By selecting a plurality of each electrode terminal 16r, 16g, 16b, a mixed color can be obtained, and as shown in FIG.
A variable current resistor 2 is connected between b and the power supply of the drive circuit board 3.
By connecting 1 r + 21 g m 21 b and changing it appropriately, the color mixing ratio can be changed. Regarding the arrangement method of the LEDs, this example uses a triangle arrangement, but other arrangements such as a line arrangement of RGB are also possible.

〔発明の効果〕〔Effect of the invention〕

以上説明したように本発明によれば、液晶表示素子のバ
ックライトカラーを自由に可変できるので、多色発光表
示が可能と々るとともに、色による表示の区別等が容易
に可能となるなどの極めて優れた効果が得られる。As explained above, according to the present invention, since the backlight color of the liquid crystal display element can be freely changed, it is possible to perform multicolor luminous display, and it is also possible to easily distinguish the display by color. Extremely excellent effects can be obtained.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は本発明による液晶表示装置の一実施例を示す断
面図、第２図（ａ）　、　（ｂ）は第１図に示したバッ
クライト用光源の平面図、そのＢ−Ｂ’線の断面図、第
３図はバックライト用光源の回路図である。 １・−・・液晶表示素子、２・・・・半導体素子、３・
・・拳駆動回路基板、４−・・−導電性ゴム、５・・Φ
・パネル、１０・・・・パックライト用光源、１１・・
・・プリント配線基板、１２ｒ、１２ｇ１１２ｂ・・・
・導体配線、１３””ＬＥＤ素子、１３ｒ、１３ｇｗ１
３ｂ　−・・・ＬＥＤ。 １４＠ｅ・・セグメント、１５・会・・ボンディングワ
イヤ、１６ｒ、１６ｇ、１６ｂ、１６ｃ　＠　＠　＠　
＠電極端子、１７・・・・ケース、１Ｂ・・・・拡散層
、１９・・・・空気層、２０・・・・拡散板、２１　ｒ
　ｒ　２１　Ｋ　＊　２１　ｂ・・・・電流可変抵抗器
。FIG. 1 is a sectional view showing an embodiment of a liquid crystal display device according to the present invention, and FIGS. 2(a) and 2(b) are plan views of the backlight light source shown in FIG. 1, taken along the line BB'. FIG. 3 is a circuit diagram of a backlight light source. 1... Liquid crystal display element, 2... Semiconductor element, 3...
・・Fist drive circuit board, 4-・・-conductive rubber, 5・・Φ
・Panel, 10...Light source for pack light, 11...
...Printed wiring board, 12r, 12g112b...
・Conductor wiring, 13"" LED element, 13r, 13gw1
3b--LED. 14@e...Segment, 15....Bonding wire, 16r, 16g, 16b, 16c @ @ @
@ Electrode terminal, 17... Case, 1B... Diffusion layer, 19... Air layer, 20... Diffusion plate, 21 r
r 21 K * 21 b... Current variable resistor.

Claims (1)

【特許請求の範囲】[Claims] １、液晶表示素子と、前記液晶表示素子の前方に配置さ
れかつ当該液晶表示素子の有効表示面に対応した開口を
有する枠状のパネルと、前記液晶表示素子の背面に配置
したバックライト用光源とを備え、前記光源は発光色の
異なる複数種のＬＥＤと、当該ＬＥＤの発光色を液晶表
示素子に拡散させる拡散装置とから構成したことを特徴
とする液晶表示装置。1. A liquid crystal display element, a frame-shaped panel arranged in front of the liquid crystal display element and having an opening corresponding to the effective display surface of the liquid crystal display element, and a backlight light source arranged on the back side of the liquid crystal display element. A liquid crystal display device, characterized in that the light source is composed of a plurality of types of LEDs that emit light of different colors, and a diffusion device that diffuses the light emission color of the LEDs to a liquid crystal display element.
JP62104326A 1987-04-30 1987-04-30 Liquid crystal display device Pending JPS63271229A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62104326A JPS63271229A (en) 1987-04-30 1987-04-30 Liquid crystal display device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62104326A JPS63271229A (en) 1987-04-30 1987-04-30 Liquid crystal display device

Publications (1)

Publication Number Publication Date
JPS63271229A true JPS63271229A (en) 1988-11-09

Family

ID=14377809

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62104326A Pending JPS63271229A (en) 1987-04-30 1987-04-30 Liquid crystal display device

Country Status (1)

Country Link
JP (1) JPS63271229A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003207780A (en) * 2002-01-16 2003-07-25 Harison Toshiba Lighting Corp Back light unit
FR2878064A1 (en) * 2004-11-15 2006-05-19 Brandt Ind Sas Backlighted data display screen for e.g. portable telephone, has electronic units to control radiation of light emitting diodes to display color among range of colors obtained by combination of colors of diodes
JP2009503561A (en) * 2005-07-20 2009-01-29 クリー インコーポレイテッド Independent control of light emitting diodes for color display backlighting

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61226682A (en) * 1985-03-30 1986-10-08 日本精機株式会社 Luminaire
JPS6216989B2 (en) * 1977-12-12 1987-04-15 Yokohama Rubber Co Ltd

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6216989B2 (en) * 1977-12-12 1987-04-15 Yokohama Rubber Co Ltd
JPS61226682A (en) * 1985-03-30 1986-10-08 日本精機株式会社 Luminaire

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003207780A (en) * 2002-01-16 2003-07-25 Harison Toshiba Lighting Corp Back light unit
FR2878064A1 (en) * 2004-11-15 2006-05-19 Brandt Ind Sas Backlighted data display screen for e.g. portable telephone, has electronic units to control radiation of light emitting diodes to display color among range of colors obtained by combination of colors of diodes
JP2009503561A (en) * 2005-07-20 2009-01-29 クリー インコーポレイテッド Independent control of light emitting diodes for color display backlighting
US8328405B2 (en) 2005-07-20 2012-12-11 Cree, Inc. Independent control of light emitting diodes

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