JPH01270029A - Liquid crystal display device - Google Patents

Liquid crystal display device

Info

Publication number
JPH01270029A
JPH01270029A JP9942488A JP9942488A JPH01270029A JP H01270029 A JPH01270029 A JP H01270029A JP 9942488 A JP9942488 A JP 9942488A JP 9942488 A JP9942488 A JP 9942488A JP H01270029 A JPH01270029 A JP H01270029A
Authority
JP
Japan
Prior art keywords
scanning
liquid crystal
crystal display
driver
electrodes
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
JP9942488A
Other languages
Japanese (ja)
Inventor
Yoshiaki Momose
百瀬　佳明
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.)
Seiko Epson Corp
Original Assignee
Seiko Epson 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 Seiko Epson Corp filed Critical Seiko Epson Corp
Priority to JP9942488A priority Critical patent/JPH01270029A/en
Publication of JPH01270029A publication Critical patent/JPH01270029A/en
Pending legal-status Critical Current

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  • Liquid Crystal (AREA)
  • Liquid Crystal Display Device Control (AREA)

Abstract

PURPOSE:To efficiently package driver LSIs to a printed circuit board by commonly using a piece of the driver LSI for scanning electrodes corresponding to both of divided signal electrodes when the number of scanning time divisions cannot be divided by the number of scanning side driver LSI outputs. CONSTITUTION:A piece of the driver LSI 9 (Dr3) is commonly used by inserting a circuit 11 to the input signal line of the scanning electrode side driver LSI 19 and the scanning lock signal 3 (YSCL) for selecting the scanning electrodes in time division and the signal 4 for turning off the time display thereof when the number of the scanning time divisions exceeds the number of the scanning electrodes are generated in case of driving the liquid crystal display panel 10 having the display capacity of 480 pieces of scanning lines (240 pieces X2 screens) by 5 pieces of the scanning side driver LSIs 9 (100 pieces of number of outputs). The effective use of the Dr3 and Dr5 is thereby attained and the driver LSIs are efficiently packaged to the printed circuit board.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は液晶表示装置の駆動方法に関する。[Detailed description of the invention] [Industrial application field] The present invention relates to a method for driving a liquid crystal display device.

〔従来の技術〕[Conventional technology]

従来、走査時分割数が走査側ドライバＬＳＩ出力数で割
り切れない場合においては、その余りの出力を開放とし
ていた。その回路例を第３図に示す。Conventionally, when the number of scanning time divisions is not divisible by the number of outputs of the scanning side driver LSI, the remaining outputs are left open. An example of the circuit is shown in FIG.

図中９のドライバＬＳＩ出力数１００本を使用し、１０
に示す走査電極数上２４０本、下２４０本を駆動する場
合には、Ｄｒ３、Ｄｒ６の出力は４０本のみを使用し余
りの６０本は開放（未使用）としていた。Using 100 driver LSI outputs (9 in the figure), 10
When driving the upper 240 scanning electrodes and the lower 240 scanning electrodes shown in the figure, only 40 outputs of Dr3 and Dr6 were used, and the remaining 60 were left open (unused).

また、走査時分割数が数種類ある場合、ドライバＬＳＩ
の開放本数、またはＣＯＦ使用の場合、液晶表示パネル
端子の開放本数を一対一対応で変更していた。In addition, if there are several types of scanning time division numbers, the driver LSI
The number of open terminals, or when using COF, the number of open terminals of the liquid crystal display panel was changed on a one-to-one basis.

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

しかし、前述の従来技術では端数使用のドライバＬＳＩ
　（Ｄｒ３、Ｄｒ６）のため、基板実装面積の増大によ
る実装効率の低下、またはＣ０Ｆ（チップ・オン・フレ
キ）使用時における液晶表示パネル上のＣＯＦ実装面積
増による液晶表示有効面積対液晶表示パネル外形の効率
低下という問照点を有する。However, in the prior art described above, the driver LSI uses fractions.
(Dr3, Dr6), there is a decrease in mounting efficiency due to an increase in the board mounting area, or an increase in the COF mounting area on the liquid crystal display panel when using COF (chip-on-flex), resulting in a decrease in the effective area of the liquid crystal display versus the external size of the liquid crystal display panel. There is a point of concern regarding the decrease in efficiency.

また、数種類の走査時分割数に対応する場合、プリント
基板のパターン変更、または液晶表示パネルのパターン
変更を必要とするという問題点を有する。Furthermore, when supporting several types of scanning time division numbers, there is a problem in that it is necessary to change the pattern of the printed circuit board or the pattern of the liquid crystal display panel.

そこで本発明はこのような問題点を解決するもので、そ
の目的とするところは、プリント基板へのドライバＬＳ
Ｉの効率良い実装、または、数種類の走査時分割数に対
して共用できる液晶表示装置を提供するところにある。Therefore, the present invention is intended to solve these problems, and its purpose is to provide driver LS to a printed circuit board.
The object of the present invention is to provide a liquid crystal display device that can efficiently implement I, or can be used in common for several types of scanning time division numbers.

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

本発明の液晶表示装置は、液晶表示パネルの走査電極側
ドライバＬＳＩの選択信号入力が単入力であり、該ドラ
イバＬＳＩをカスケード接続して複数使用し、走査時分
割数が全走査電極数と一致しない場合で、かつ信号電極
を上下二分割して使用する液晶表示装置において、走査
時分割数が前記ドライバＬＳＩ出力数で割り切れない場
合、一個の前記ドライバＬＳＩを分割された双方の信号
電極に対応する走査電極に共用したことを特徴とする。In the liquid crystal display device of the present invention, the selection signal input of the driver LSI on the scanning electrode side of the liquid crystal display panel is a single input, and a plurality of driver LSIs are connected in cascade to use, and the number of scanning time divisions matches the total number of scanning electrodes. If not, and in a liquid crystal display device in which the signal electrode is divided into upper and lower halves, and the number of scanning time divisions is not divisible by the number of outputs of the driver LSI, one driver LSI can be used for both divided signal electrodes. It is characterized in that it can be used commonly as a scanning electrode.

〔実　施　例〕〔Example〕

第１図に示す回路を走査電極側ドライバＬＳＩの入力信
号ラインに挿入することにより、第３図に示すＤｒ３、
Ｄｒ６の効率的な使用が計れ、かつ数種類の走査時分割
数に対して同一液晶表示パネルを共用化することが可能
となった。By inserting the circuit shown in FIG. 1 into the input signal line of the scanning electrode side driver LSI, Dr3 shown in FIG.
It has become possible to use the Dr6 efficiently and to share the same liquid crystal display panel for several types of scanning time division numbers.

第１図に示す回路の動作を説明すれば、走査電極を時分
割に選択するためのスキャンクロック信号３　（ＹＳＣ
Ｌ）および、走査時分割数が走査電極数を越えた場合に
、その時間表示ＯＦＦにするための信号４＜ＩＮＨ）を
発生するために、予めプリセットされた走査時分割数ま
で、−走査ライン毎に入力されるクロック２　（ＬＰ）
を１６進カウンタ５でカウントし、その出力をフリップ
フロップＡ６で状態反転し、アンドゲート８でＬＰと乗
じたものをＹＳＣＬ出力３としている。またフリップフ
ロラ１Ｂ７により（走査時分割数＋１）ラインになった
ときＩＮＨ出力がアクティブになる。To explain the operation of the circuit shown in FIG. 1, the scan clock signal 3 (YSC
L) and -scan line up to a preset number of scan time divisions in order to generate a signal 4<INH) to turn off the time display when the number of scan time divisions exceeds the number of scan electrodes. Clock 2 (LP) input every time
is counted by a hexadecimal counter 5, the state of the output is inverted by a flip-flop A6, and the result is multiplied by LP by an AND gate 8, which is the YSCL output 3. Furthermore, the INH output becomes active when the number of lines reaches (scanning time division number + 1) due to the flip roller 1B7.

第２図は、本発明の一実施例における回路例を示す。FIG. 2 shows an example of a circuit according to an embodiment of the present invention.

この回路は走査線本数４８０本（２４０本×２画面）の
表示容量を有する液晶表示パネルを駆動した例である。This circuit is an example of driving a liquid crystal display panel having a display capacity of 480 scanning lines (240 lines x 2 screens).

その特徴は走査側ドライバＬＳＩ９（出力本数１００本
）５個で構成され、かつ走査線の選択信号４（液晶表示
パネルの表示をオフにするための信号）をカスケード接
続しているにも拘らず本発明の回路１１を使用すること
により、走査線本数２４０本×２画面の液晶表示パネル
での走査時分割数１／２４０〜１／２５６デユーテイの
範囲内での使用が可能になったことである。Its feature is that it is composed of five scanning side driver LSIs (100 outputs), and that the scanning line selection signal 4 (signal for turning off the display on the liquid crystal display panel) is connected in cascade. By using the circuit 11 of the present invention, it is possible to use the scanning time division number within the range of 1/240 to 1/256 duty on a liquid crystal display panel with 240 scanning lines x 2 screens. be.

〔発明の効果〕〔Effect of the invention〕

以上述べたように本発明によれば、プリント基板へのド
ライバＬＳＩの効率良い実装ができまた数種類の走査時
分割数に対して液晶表示パネルの表示状態をくずすこと
なく使用することが可能な液晶表示装置を提供できた。As described above, according to the present invention, a driver LSI can be efficiently mounted on a printed circuit board, and a liquid crystal display panel can be used for several types of scanning time division numbers without changing the display state of the liquid crystal display panel. We were able to provide a display device.

また数種類の走査時分割数に対して、液晶表示パネルは
同一で良いという効果をも持つ。It also has the effect that the same liquid crystal display panel can be used for several types of scanning time division numbers.

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

第１図は本発明の液晶表示装置の一実施例を示す回路図
。 第２図は本発明の一実施例を示すブロック図。 第３図は従来の液晶表示装置を示すブロック図。 １・・・走査電極選択信号 ２・・・−走査ライン毎に入力されるクロック ３・・・走査電極を時分割に選択するためのスキャンク
ロック信号 ４・・・選択信号 ５・・・１６進カウンタ ６・・・フリップフロップＡ ７・・・フリップフロップＢ ８・・・アンドゲート ９・・・走査側ドライバＬＳ１ １０・・・液晶表示パネル １１・・・回路FIG. 1 is a circuit diagram showing an embodiment of the liquid crystal display device of the present invention. FIG. 2 is a block diagram showing one embodiment of the present invention. FIG. 3 is a block diagram showing a conventional liquid crystal display device. 1...Scanning electrode selection signal 2...-Clock input for each scanning line 3...Scan clock signal for time-divisionally selecting scanning electrodes 4...Selection signal 5...Hexadecimal Counter 6...Flip-flop A 7...Flip-flop B 8...And gate 9...Scanning side driver LS1 10...Liquid crystal display panel 11...Circuit

Claims (1)

【特許請求の範囲】[Claims] 液晶表示パネルの走査電極側ドライバＬＳＩの選択信号
入力が単入力であり、該ドライバＬＳＩをカスケード接
続して複数使用し、走査時分割数が全走査電極数と一致
しない場合で、かつ信号電極を上下二分割して使用する
液晶表示装置において、走査時分割数が前記ドライバＬ
ＳＩ出力数で割り切れない場合、一個の前記ドライバＬ
ＳＩを分割された双方の信号電極に対応する走査電極に
共用したことを特徴とする液晶表示装置。When the selection signal input of the driver LSI on the scan electrode side of the liquid crystal display panel is a single input, when multiple driver LSIs are connected in cascade and the number of scan time divisions does not match the total number of scan electrodes, and when the signal electrode is In a liquid crystal display device that is divided into upper and lower halves, the number of scanning time divisions is the same as the driver L.
If it is not divisible by the number of SI outputs, one driver L
A liquid crystal display device characterized in that an SI is shared as a scanning electrode corresponding to both divided signal electrodes.
JP9942488A 1988-04-22 1988-04-22 Liquid crystal display device Pending JPH01270029A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9942488A JPH01270029A (en) 1988-04-22 1988-04-22 Liquid crystal display device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9942488A JPH01270029A (en) 1988-04-22 1988-04-22 Liquid crystal display device

Publications (1)

Publication Number Publication Date
JPH01270029A true JPH01270029A (en) 1989-10-27

Family

ID=14247080

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9942488A Pending JPH01270029A (en) 1988-04-22 1988-04-22 Liquid crystal display device

Country Status (1)

Country Link
JP (1) JPH01270029A (en)

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