JPH01185526A - Liquid crystal display device - Google Patents

Liquid crystal display device

Info

Publication number
JPH01185526A
JPH01185526A JP864888A JP864888A JPH01185526A JP H01185526 A JPH01185526 A JP H01185526A JP 864888 A JP864888 A JP 864888A JP 864888 A JP864888 A JP 864888A JP H01185526 A JPH01185526 A JP H01185526A
Authority
JP
Japan
Prior art keywords
display range
effective display
liquid crystal
electrode
outside
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
JP864888A
Other languages
Japanese (ja)
Inventor
Taiichi Kawamura
川村　泰一
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP864888A priority Critical patent/JPH01185526A/en
Priority to KR1019880017326A priority patent/KR890012184A/en
Priority to GB8901175A priority patent/GB2214342A/en
Priority to DE3901761A priority patent/DE3901761A1/en
Publication of JPH01185526A publication Critical patent/JPH01185526A/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
    • G02F1/1343—Electrodes
    • G02F1/134309—Electrodes characterised by their geometrical arrangement
    • G02F1/134336—Matrix
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0232—Special driving of display border areas

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Nonlinear Science (AREA)
  • Engineering & Computer Science (AREA)
  • Liquid Crystal (AREA)
  • Mathematical Physics (AREA)
  • Geometry (AREA)
  • Optics & Photonics (AREA)
  • Computer Hardware Design (AREA)
  • Theoretical Computer Science (AREA)
  • Liquid Crystal Display Device Control (AREA)

Abstract

PURPOSE:To obtain superior display quality even when characters or patterns are constituted by using display elements at the outermost ends of the effective display range of a liquid crystal panel by providing electrode patterns corresponding to scanning electrodes and signal electrodes outside the effective display range. CONSTITUTION:A part 14 outside the effective display range is provided with an upper electrode 15 and a lower electrode 16 outside the effective display range corresponding to scanning electrodes 5 and a left electrode and a right electrode 8 outside the effective display range corresponding to signal electrodes 6 so that the effective display range 8 is surrounded. Then when the liquid crystal display panel 1 is in a display state, a driving circuit 9 for the scanning electrodes and a driving circuit 10 for the signal electrodes apply those electrodes with such voltages that display picture elements 7 within the effective display range 8 make no display. Therefore, the background color of the part 14 outside the effective display range has the same hue with the background color of the part 8 within the effective display range and their border is eliminated. Consequently, even when characters or patterns are constituted by using display picture elements 7 at the outermost ends of the effective display range 8, their display quality is improved.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明はコンピュータやワードプロセッサ等の事務用機
器の表示装置として使用するドツトマトリックス形液晶
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 dot matrix liquid crystal display device used as a display device for office equipment such as computers and word processors.

〔従来の技術〕[Conventional technology]

第５図は従来の液晶表示パネルの正面図、第６図はその
電極配置図、第７図は第５図の断面図、第８図はそのＡ
部拡大図である０図において、（１）は液晶表示パネル
、（２）はその上面に設けられた上面ガラス基板、（３
）は下面に設けられた下面ガラス基板、（４）は両ガラ
ス基板（２）　、　（３）間に充填された液晶、（５）
は下面ガラス基板（３）の液晶（４）側に横方向に配置
された走査電極、（６）は上面ガラス基板（２）の液晶
（４）側に縦方向に配置された信号電極、（７）は周電
極（５）、（６）の交点に形成された表示画素、（８）
は表示画素（７）によって形成される有効表示範囲であ
る。（９）は走査電極用駆動回路、（ｌＯ）は信号電極
用駆動回路で、駆動回路搭載基板（１１）に搭載されて
いる。（１２）は液晶表示パネル（１）と駆動回路搭載
基板（１１）を接続するケーブル、（１３）は封止材で
ある。Figure 5 is a front view of a conventional liquid crystal display panel, Figure 6 is its electrode arrangement, Figure 7 is a sectional view of Figure 5, and Figure 8 is its A.
In Figure 0, which is an enlarged view of a portion, (1) is a liquid crystal display panel, (2) is a top glass substrate provided on its top surface, and (3
) is the lower glass substrate provided on the lower surface, (4) is the liquid crystal filled between both glass substrates (2) and (3), (5)
(6) is a scanning electrode arranged horizontally on the liquid crystal (4) side of the lower glass substrate (3), a signal electrode (6) arranged vertically on the liquid crystal (4) side of the upper glass substrate (2), ( 7) is a display pixel formed at the intersection of circumferential electrodes (5) and (6); (8)
is the effective display range formed by the display pixels (7). (9) is a drive circuit for scanning electrodes, and (lO) is a drive circuit for signal electrodes, which are mounted on a drive circuit mounting board (11). (12) is a cable connecting the liquid crystal display panel (1) and the drive circuit mounting board (11), and (13) is a sealing material.

従来の液晶表示装置は液晶表示パネル（１）の上面ガラ
ス基板（２）と下面ガラス基板（３）に、透明電極膜に
より信号電極（６）と走査電極（５）がマトリックス状
に構成されており、走査電極（５）と信号電極（６）の
交点が表示画素（７）となる。In a conventional liquid crystal display device, signal electrodes (6) and scanning electrodes (5) are arranged in a matrix shape using transparent electrode films on the upper glass substrate (2) and lower glass substrate (3) of the liquid crystal display panel (1). The intersection of the scanning electrode (5) and the signal electrode (6) becomes a display pixel (7).

上記の構成において、走査電極用駆動回路（９）から走
査電極（５）に走査信号を送り、信号電極用駆動回路（
１０）から信号電極（６）に信号を送ると、両信号が送
られた電極（５）、　（６）の交点の表示画素（７）に
対応する液晶（４）が表示状態となる。この表示画素（
７）の集まった範囲が有効表示範囲（８）となっており
、液晶表示パネル（１）の表示状態の時、有効表示範囲
外（１４）の下地色は、有効表示範囲（８）の下地色と
色相が異なる。In the above configuration, a scanning signal is sent from the scanning electrode drive circuit (9) to the scanning electrode (5), and the signal electrode drive circuit (
When a signal is sent from 10) to the signal electrode (6), the liquid crystal (4) corresponding to the display pixel (7) at the intersection of the electrodes (5) and (6) to which both signals are sent enters a display state. This display pixel (
The range where 7) are collected is the effective display range (8), and when the LCD panel (1) is in the display state, the background color of the area outside the effective display range (14) is the base color of the effective display range (8). Different colors and hues.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

従来の液晶表示装置は以上のように構成されているので
、有効表示範囲（８）の最外端の表示画素（７）を用い
て文字や画像を構成する場合、有効表示範囲（８）の下
地色と有効表示範囲外（１４）の下地色との色相が異な
り、表示品位が悪くなる。特に有効表示範囲外（１４）
の下地色が文字や画像の表示色と同じになる場合は、文
字や画像の識別が困難になる。Conventional liquid crystal display devices are configured as described above, so when configuring characters or images using the outermost display pixels (7) of the effective display range (8), the outermost display pixels (7) of the effective display range (8) The hue of the base color and the base color outside the effective display range (14) is different, resulting in poor display quality. Especially outside the effective display range (14)
If the background color of the image is the same as the display color of the text or image, it becomes difficult to distinguish the text or image.

この発明は上記のような問題点を解消するためになされ
たもので、液晶表示パネルの表示状態のときに、有効表
示範囲外の下地色を有効表示範囲の下地色と同じにして
、表示品位を改善した液晶表示装置を得ることを目的と
する。This invention was made in order to solve the above-mentioned problems, and it improves the display quality by making the base color outside the effective display range the same as the base color in the effective display range during the display state of the liquid crystal display panel. The object of the present invention is to obtain a liquid crystal display device with improved characteristics.

〔課題を解決するための手段〕[Means to solve the problem]

この発明に係る液晶表示装置は、文字や画像を表示する
液晶表示装置において、液晶表示パネルの有効表示範囲
外に走査電極および信号電極に対応する電極パターンを
設け、液晶表示パネルの表示状態の際、有効表示範囲外
の下地色が有効表示範囲の下地色と同じ色相になるよう
に、上記電極パターンを走査電極用駆動回路および信号
電極用駆動回路により駆動するようにしたものである。A liquid crystal display device according to the present invention is a liquid crystal display device for displaying characters and images, in which electrode patterns corresponding to scanning electrodes and signal electrodes are provided outside the effective display range of the liquid crystal display panel, and when the display state of the liquid crystal display panel is changed. The electrode pattern is driven by a scanning electrode drive circuit and a signal electrode drive circuit so that the base color outside the effective display range has the same hue as the base color within the effective display range.

すなわち本発明は、液晶表示パネルの有効表示範囲外に
走査電極と信号電極に相当する電極パターンを設け、液
晶表示パネルの表示状態で、これらの電極に表示画素が
表示しない状態と同じ電圧を走査電極用および信号電極
用駆動回路から印加するようにしたものである。That is, the present invention provides an electrode pattern corresponding to a scanning electrode and a signal electrode outside the effective display range of a liquid crystal display panel, and scans these electrodes with the same voltage as in a state where no display pixel is displayed in the display state of the liquid crystal display panel. The voltage is applied from electrode and signal electrode drive circuits.

〔作　用〕[For production]

この発明の液晶表示装置においては、液晶表示パネルの
有効表示範囲外に走査電極と信号電極に相当する電極パ
ターンを設けることにより、液晶表示パネルの表示状態
時に、有効表示範囲外の電極パターンにも有効表示範囲
内に印加されるのと同様な電圧を走査電極用および信号
電極用駆動回路から印加し、これにより有効表示範囲内
外とも同じ下地色となり、有効表示範囲の最外端の表示
画素を用いて、文字や画像を構成する場合でも優れた表
示品位の文字や画像を得ることができる。In the liquid crystal display device of the present invention, by providing electrode patterns corresponding to scanning electrodes and signal electrodes outside the effective display range of the liquid crystal display panel, the electrode patterns outside the effective display range can also be used during the display state of the liquid crystal display panel. A voltage similar to that applied within the effective display range is applied from the scanning electrode and signal electrode drive circuits, so that the base color is the same both inside and outside the effective display range, and the outermost display pixel of the effective display range is Even when composing characters and images using the above-mentioned method, it is possible to obtain characters and images with excellent display quality.

〔発明の実施例〕[Embodiments of the invention]

以下、この発明の一実施例を図について説明する。第１
図は実施例の液晶表示パネルの正面図、第２図はその′
ｉｔ極配置図、第３図は第１図の断面図、第４図はその
Ｂ部拡大図であり、図において、（１）〜（１４）は第
５図ないし第８図と同一または相当部分を示す。（１５
）は有効表示範囲外上側電極、（１６）は有効表示範囲
外下側電極で、それぞれ上下の有効表示範囲外（１４）
に走査電極（５）に対応して設けられており、走査電極
用駆動回路（９）により駆動されるようになっている。An embodiment of the present invention will be described below with reference to the drawings. 1st
The figure is a front view of the liquid crystal display panel of the example, and Figure 2 is its '
FIG. 3 is a sectional view of FIG. 1, and FIG. 4 is an enlarged view of part B. In the figures, (1) to (14) are the same as or equivalent to FIGS. 5 to 8. Show parts. (15
) is the upper electrode outside the effective display range, (16) is the lower electrode outside the effective display range, and (14) is outside the upper and lower effective display range, respectively.
The electrodes are provided corresponding to the scanning electrodes (5), and are driven by a scanning electrode drive circuit (9).

（１７）は有効表示範囲外左側電極、（１８）は有効表
示範囲外右側電極で、それぞれ左右の有効表示範囲外（
１４）に信号電極（６）に対応して設けられており、信
号電極用駆動回路（１０）により駆動されるようになっ
ている。(17) is the left electrode outside the effective display range, and (18) is the right electrode outside the effective display range.
14) corresponding to the signal electrode (6), and is driven by a signal electrode drive circuit (10).

上記のように構成された液晶表示装置においては、有効
表示範囲外（１４）に、液晶表示パネル（１）の有効表
示範囲（８）を囲むように、走査電極（５）に対応する
有効表示範囲外上側電極（１５）と有効表示範囲外下側
電極（１６）、ならびに信号電極（６）に対応する有効
表示範囲外左側電極（１７）と有効表示範囲外右側電極
（１８）を設け、液晶表示パネル（１）の表示状態のと
き、これらの電極に有効表示範囲（８）の表示画素（７
）が表示しない状態の電圧を走査電極用駆動回路（９）
および信号電極用駆動回路（１０）から印加することに
より、有効表示範囲外（１４）の下地色は有効表示範囲
（８）の下地色と同じ色相となり、有効表示範囲内外の
境界が無くなる。そのため有効表示範囲（８）の最外端
の表示画素（７）を用いて文字や画像を構成する場合で
も、これらの表示品位が改善される。In the liquid crystal display device configured as described above, an effective display area corresponding to the scanning electrode (5) is placed outside the effective display area (14) so as to surround the effective display area (8) of the liquid crystal display panel (1). An upper electrode outside the effective display range (15), a lower electrode outside the effective display range (16), and a left electrode outside the effective display range (17) and a right electrode outside the effective display range (18) corresponding to the signal electrode (6) are provided, When the liquid crystal display panel (1) is in the display state, these electrodes are connected to the display pixels (7) in the effective display range (8).
) is not displayed on the scanning electrode drive circuit (9)
By applying voltage from the signal electrode drive circuit (10), the base color of the outside of the effective display range (14) becomes the same hue as the base color of the effective display range (8), and there is no boundary between the inside and outside of the effective display range. Therefore, even when characters and images are constructed using the outermost display pixels (7) of the effective display range (8), the display quality of these is improved.

なお、上記実施例では、液晶表示パネル（１）の有効表
示範囲外（１４）に上側電極（１５）　、下側電極（１
６）、左側電極（１７）、右側電極（１８）をそれぞれ
１本づつ設けたものを示したが、それぞれ複数本の電極
を設けてもよく、上記実施例と同様の効果を奏する。In the above embodiment, the upper electrode (15) and the lower electrode (1) are located outside the effective display range (14) of the liquid crystal display panel (1).
6), one left electrode (17) and one right electrode (18) are shown, but a plurality of electrodes may be provided for each, and the same effect as in the above embodiment can be obtained.

〔発明の効果〕〔Effect of the invention〕

以上のように、この発明によれば、液晶表示パネルの有
効表示範囲外に電極パターンを設けることにより、液晶
表示パネルの全面が同一の下地色となり、有効表示範囲
の最外端の表示画素を用いて文字や画像を構成しても優
れた表示品位を得られる効果がある。As described above, according to the present invention, by providing an electrode pattern outside the effective display range of the liquid crystal display panel, the entire surface of the liquid crystal display panel has the same base color, and the display pixels at the outermost end of the effective display range are Even if characters and images are constructed using the above-described method, excellent display quality can be obtained.

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

第１図はこの発明の一実施例による液晶表示パネルの正
面図、第２図はその電極配置図、第３図は第１図の断面
図、第４図はそのＢ部拡大図、第５図は従来の液晶表示
パネルの正面図、第６図はその電極配置図、第７図は第
５図の断面図、第８図はそのＡ部拡大図である。 各図中、同一符号は同一または相当部分を示し、（１）
は液晶表示パネル、（２）は上面ガラス基板、（３）は
下面ガラス基板、（４）は液晶、（５）は走査電極、（
６）は信号電極、（７）は表示画素、（８）は有効表示
範囲、（９）は走査電極用駆動回路、（１０）は信号電
極用駆動回路、（１１）は駆動回路搭載基板、（１４）
は有効表示範囲外、（１５）は有効表示範囲外上側電極
、（１６）は有効表示範囲外下側電極、（１７）は有効
表示範囲外左側電極、（１８）は有効表示範囲外右側電
極である。FIG. 1 is a front view of a liquid crystal display panel according to an embodiment of the present invention, FIG. 2 is a diagram of its electrode arrangement, FIG. 3 is a sectional view of FIG. 1, FIG. 4 is an enlarged view of section B, and FIG. 6 is a front view of a conventional liquid crystal display panel, FIG. 6 is a diagram of its electrode arrangement, FIG. 7 is a sectional view of FIG. 5, and FIG. 8 is an enlarged view of section A thereof. In each figure, the same reference numerals indicate the same or corresponding parts, (1)
is a liquid crystal display panel, (2) is a top glass substrate, (3) is a bottom glass substrate, (4) is a liquid crystal, (5) is a scanning electrode, (
6) is a signal electrode, (7) is a display pixel, (8) is an effective display range, (9) is a scanning electrode drive circuit, (10) is a signal electrode drive circuit, (11) is a drive circuit mounting board, (14)
is outside the effective display range, (15) is the upper electrode outside the effective display range, (16) is the lower electrode outside the effective display range, (17) is the left electrode outside the effective display range, (18) is the right electrode outside the effective display range. It is.

Claims (1)

【特許請求の範囲】[Claims] （１）文字や画像を表示する液晶表示装置において、液
晶表示パネルの有効表示範囲外に走査電極および信号電
極に対応する電極パターンを設け、液晶表示パネルの表
示状態の際、有効表示範囲外の下地色が有効表示範囲の
下地色と同じ色相になるように、上記電極パターンを走
査電極用駆動回路および信号電極用駆動回路により駆動
するようにしたことを特徴とする液晶表示装置。(1) In a liquid crystal display device that displays characters and images, electrode patterns corresponding to scanning electrodes and signal electrodes are provided outside the effective display range of the liquid crystal display panel, and when the liquid crystal display panel is in the display state, A liquid crystal display device characterized in that the electrode pattern is driven by a scanning electrode drive circuit and a signal electrode drive circuit so that the base color has the same hue as the base color of the effective display range.
JP864888A 1988-01-19 1988-01-19 Liquid crystal display device Pending JPH01185526A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP864888A JPH01185526A (en) 1988-01-19 1988-01-19 Liquid crystal display device
KR1019880017326A KR890012184A (en) 1988-01-19 1988-12-23 LCD Display
GB8901175A GB2214342A (en) 1988-01-19 1989-01-19 Liquid crystal display apparatus
DE3901761A DE3901761A1 (en) 1988-01-19 1989-01-19 LIQUID CRYSTAL DISPLAY DEVICE

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP864888A JPH01185526A (en) 1988-01-19 1988-01-19 Liquid crystal display device

Publications (1)

Publication Number Publication Date
JPH01185526A true JPH01185526A (en) 1989-07-25

Family

ID=11698762

Family Applications (1)

Application Number Title Priority Date Filing Date
JP864888A Pending JPH01185526A (en) 1988-01-19 1988-01-19 Liquid crystal display device

Country Status (1)

Country Link
JP (1) JPH01185526A (en)

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