JPH0261612A - Liquid crystal display device - Google Patents

Liquid crystal display device

Info

Publication number
JPH0261612A
JPH0261612A JP21319388A JP21319388A JPH0261612A JP H0261612 A JPH0261612 A JP H0261612A JP 21319388 A JP21319388 A JP 21319388A JP 21319388 A JP21319388 A JP 21319388A JP H0261612 A JPH0261612 A JP H0261612A
Authority
JP
Japan
Prior art keywords
display
liquid crystal
larger
voltage
crystal 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.)
Pending
Application number
JP21319388A
Other languages
Japanese (ja)
Inventor
Toshiaki Naka
中 敏明
Takahide Ito
高英 伊藤
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP21319388A priority Critical patent/JPH0261612A/en
Publication of JPH0261612A publication Critical patent/JPH0261612A/en
Pending legal-status Critical Current

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

Abstract

PURPOSE:To make the light-dark brightness difference between a display dot and a nondisplay dot constant regardless of a display pattern and to make a display image plane clear by making the absolute value of a voltage applied to a liquid crystal panel larger and larger as the quantity of variation of display data of one image plane by a detecting means is larger and larger. CONSTITUTION:A liquid crystal display circuit 1 supplies display data and various timing signals to a driving circuit 2, which drives the liquid crystal panel 3 to make a display. The detecting means 4 detects the quantity of variation of the display data of one image plane and a voltage applying means 5 makes the absolute value of the voltage applied to the liquid crystal panel 3 from the driving circuit 2 larger and larger as the quantity of variation obtained by the detecting means 4 is larger and larger. Consequently, the rounding of the waveform of the applied voltage by the display panel 3 when a checkered pattern which is large in the quantity of variation of the display data displaced, is compensated. Consequently, the light-dark brightness difference between display dots and nondisplay dots is made constant regardless of the display pattern and the display image plane is made clear.

Description

【発明の詳細な説明】 〔概要〕 単純マトリクス方式の液晶表示装置に関し、表示パター
ンに拘らず表示ドツトと非表示ドツトとの明暗の胛度差
が一定で表示画面が鮮明なことを目的とし、 液晶パネルを単純マトリクス方式で駆動する液晶表示装
置において、一画面分の表示データの変化感を検出する
検出手段と、該検出手段で得られた変化mが大なる程、
該液晶パネルに印加する電圧の絶対値を大とする電圧印
加手段とを有し構成する。
[Detailed Description of the Invention] [Summary] An object of the present invention is to provide a simple matrix type liquid crystal display device with a clear display screen with a constant brightness difference between display dots and non-display dots regardless of the display pattern. In a liquid crystal display device that drives a liquid crystal panel in a simple matrix method, there is a detection means for detecting a change in display data for one screen, and the larger the change m obtained by the detection means, the more
and voltage applying means for increasing the absolute value of the voltage applied to the liquid crystal panel.

〔産業上の利用分野〕[Industrial application field]

本発明は液晶表示装置に関し、単純マトリクス方式の液
晶表示装置に関する。
The present invention relates to a liquid crystal display device, and more particularly to a simple matrix type liquid crystal display device.

液晶の駆動方法は各種あるが、最も一般的なものとして
、単純マトリクス方式がある。これは液晶パネルの上下
の基板に互いに直交するストライブ状のX信@電極(走
査電極)、Y信号電極(表示電極)を設け、時分割駆動
を行なう。
There are various methods of driving liquid crystals, but the most common one is the simple matrix method. In this method, X signal @ electrodes (scanning electrodes) and Y signal electrodes (display electrodes) are provided in a stripe shape orthogonal to each other on the upper and lower substrates of the liquid crystal panel, and time-division driving is performed.

液晶表示装置では表示される画像のパターンに拘らず、
表示ドツト(黒)及び非表示ドツト(白)夫々の輝度が
一定であることが要望されている。
Regardless of the image pattern displayed on a liquid crystal display device,
It is desired that the brightness of each of the display dots (black) and the non-display dots (white) be constant.

〔従来の技術〕[Conventional technology]

液晶表示装置では、選択X信号電極に電圧Vo。 In the liquid crystal display device, a voltage Vo is applied to the selected X signal electrode.

v5を印加し、非選択のX信号電極に電1fV+。Apply voltage V5 and apply voltage 1fV+ to the unselected X signal electrode.

v4を印加し、表示ドツトのY信号電極に電圧Vo、V
sを印加し、非表示ドツトのY信号電極に電圧V2 、
V3を印加する。なおVo >V+ >V2 >V3>
V4 >V5 (1)III係ニアル。
V4 is applied, and voltages Vo and V are applied to the Y signal electrode of the display dot.
s is applied to the Y signal electrode of the non-display dot, and a voltage V2,
Apply V3. Note that Vo >V+ >V2 >V3>
V4 > V5 (1) Section III.

従来装置では上記の電圧Vo 、V+ 、V2 。In the conventional device, the above voltages Vo, V+, and V2.

V3 、V4 、Vs夫々は常時一定とされている。V3, V4, and Vs are always constant.

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

市松パターンの画像を表示する場合にはX信号電極の印
加型HはVo又はv5とvl又はV4とが順次切換わる
波形となり、またY信号電極の印加電圧はVo又はv5
とvl又はv3が順次切換わる波形となる。液晶パネル
は等価的に抵抗容量成分で構成されているため、上記X
信号電極及びY信号電極夫々の印加電圧波形が積分され
なまってしまう。
When displaying a checkered pattern image, the voltage applied to the X signal electrode H has a waveform in which Vo or v5 and vl or V4 are sequentially switched, and the voltage applied to the Y signal electrode is Vo or v5.
The waveform is such that , vl or v3 are sequentially switched. Since the liquid crystal panel is equivalently composed of resistance-capacitance components, the above
The voltage waveforms applied to each of the signal electrode and the Y signal electrode are not integrated.

このため、全黒又は全白のパターンに対して印加型ロー
の切換わりが多い市松パターンでは表示ドラ]〜と非表
示ドツトとの引明の輝度差が小さく表示画面が不鮮明に
なるという問題があった。
For this reason, in a checkered pattern where there are many switching between applied low and all-black or all-white patterns, there is a problem that the difference in brightness between the display dots and the non-display dots is small and the display screen becomes unclear. there were.

本発明は上記の点に鑑みなされたもので、表示パターン
に拘らず表示ドツトと非表示ドツトとの明暗の輝度差が
一定で表示画面が鮮明な液晶表示装置を提供することを
目的とする。
The present invention has been made in view of the above points, and an object of the present invention is to provide a liquid crystal display device in which the brightness difference between display dots and non-display dots is constant regardless of the display pattern, and the display screen is clear.

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

第1図は本発明装置の原理図を示す−。 FIG. 1 shows a diagram of the principle of the device of the present invention.

同図中、液晶制御回路1は表示データ及び各種タイミン
グ信号を駆動回路2に供給し、駆動回路2によって液晶
パネル3が駆動されて表示が行なわれる。
In the figure, a liquid crystal control circuit 1 supplies display data and various timing signals to a drive circuit 2, and the drive circuit 2 drives a liquid crystal panel 3 to perform display.

検出手段4は−lI!11面分の表示データの変化mを
検出する。電圧印加手段5は、検出手段4で得られた変
化間が大なる稈、駆動回路2から液晶パネル3に印加す
る電圧の絶対値を大とする。
The detection means 4 is -lI! Changes m in display data for 11 screens are detected. The voltage applying means 5 increases the absolute value of the voltage applied from the drive circuit 2 to the liquid crystal panel 3 when the difference between the changes obtained by the detecting means 4 is large.

(作用) 本発明装置においでは、1画面分の表示データの変化5
1が大なる程液晶パネル3の印加電圧の絶対値が人とさ
れるので、表示データの変化間が大なる市松パターンを
表示するどさの表示パネル3による印加電圧波形のなま
りが補償され、表示パターンに拘らず表示画面は常時鮮
明となる。
(Function) In the device of the present invention, the change in display data for one screen 5
The larger the value of 1, the greater the absolute value of the voltage applied to the liquid crystal panel 3. Therefore, the rounding of the applied voltage waveform caused by the display panel 3, which displays a checkered pattern with a large interval between changes in display data, is compensated for. The display screen is always clear regardless of the display pattern.

〔実施例〕〔Example〕

第2図は本発明装置の一実施例のブロック図を示す。 FIG. 2 shows a block diagram of an embodiment of the device of the present invention.

fFi1図中、液晶制御回路10は、Xデータ(表示デ
ータ)及びXf−タシフト(f1号をX駆動回路11に
供給し、YデータをY駆動回路12に供給し、これと共
に水面走査周期(例えば1水平走査周期は垂直走査周期
の1/200>のラッチ信号をX駆動回路71及びYl
jA動回路12夫々に供給する。
In the fFi1 diagram, the liquid crystal control circuit 10 supplies X data (display data) and One horizontal scanning period is a latch signal of 1/200 of the vertical scanning period.
jA dynamic circuit 12 respectively.

また、上記液晶4制御回路10より水平走査周期毎にシ
リアルに出力され、るXデータはエツジカウンタ13の
計数端子に供給され、液晶制御回路10より垂直走査周
期で出ツノされるリセット信号はエツジカウンタ13の
リセットMFRに供給される。
Further, the X data serially outputted from the liquid crystal 4 control circuit 10 in each horizontal scanning period is supplied to the counting terminal of the edge counter 13, and the reset signal outputted from the liquid crystal control circuit 10 in the vertical scanning period is applied to the edge counter 13. It is supplied to the reset MFR of the counter 13.

エツジカウンタ13はリセット信号によりリセットされ
た後、1!r!直走査円走査のXデータの立上りエツジ
をカウントして、1画面中における表示ドツトと非表示
ドツトの切換わりをカウントする。
After being reset by the reset signal, the edge counter 13 is set to 1! r! The rising edges of the X data of direct scanning and circular scanning are counted, and the switching between display dots and non-display dots in one screen is counted.

このエツジカウンタ13の出力するカウント値はD/A
コンバータ14でアナログ化されて電源回路15に供給
される。
The count value output by this edge counter 13 is D/A
The signal is converted into an analog signal by the converter 14 and supplied to the power supply circuit 15 .

電源回路15は第3図に示す構成である。同図中、端子
20にはD/Aコンバータ14の出力信号が入来し、反
転増幅器21で反転されてpnQ形トランジスタQ1の
ベースに供給される。
The power supply circuit 15 has the configuration shown in FIG. In the figure, the output signal of the D/A converter 14 is input to a terminal 20, inverted by an inverting amplifier 21, and supplied to the base of a pnQ type transistor Q1.

トランジスタQ+ のエミッタには電源’4fGND 
(=OV)に接続され、そのコレクタはpnp形トラン
ジスタQ2のエミッタに接続されている。トランジスタ
Q2のベースは電源端子G N D トi411i!端
子V E E (=  24 V )との間に接続され
た可変抵抗VRの摺動接点に接続され、そのコレクタは
pnp形トランジスタQ3のベースに接続されている。
Power supply '4fGND is connected to the emitter of transistor Q+.
(=OV), and its collector is connected to the emitter of the pnp transistor Q2. The base of transistor Q2 is connected to the power supply terminal GND i411i! It is connected to a sliding contact of a variable resistor VR connected between terminal VEE (=24 V), and its collector is connected to the base of a pnp transistor Q3.

トランジスタQ3のエミッタは直列接続された抵抗R1
〜R5を介して電源端子GNDに接続され、コレクタは
電源端子v1.に接続されている。
The emitter of transistor Q3 is connected in series with resistor R1.
~R5 is connected to the power supply terminal GND, and the collector is connected to the power supply terminal v1. It is connected to the.

電源端子GNDの電圧は直接端?28より電圧Voとし
て出力され、抵抗R+ 、R2の接続点の電圧tよバッ
フ77ンプ23を介し電圧V1として端子29より出力
され、抵抗R2、R3の接続点の電圧はバッファアンプ
24を介し電圧v2と1ノで端子30より出力され、抵
抗Rz 、R4の接続点の電圧はバッファアンプ25を
介し電圧■3として端子31より出力され、抵抗R4、
Rsの接続点の電圧はバッファアンプ26を介し電圧V
4として端子32より出力され、トランジスタQ3のエ
ミッタ電圧はバッフ?7ンプ27を介し電圧v5として
端子33より出力される。
Is the voltage of the power supply terminal GND a direct terminal? The voltage t at the connection point of the resistors R+ and R2 is outputted from the terminal 29 as the voltage V1 via the buffer 77 amplifier 23, and the voltage at the connection point of the resistors R2 and R3 is outputted from the terminal 29 as the voltage Vo through the buffer amplifier 24. V2 and 1 are output from terminal 30, and the voltage at the connection point of resistors Rz and R4 is outputted from terminal 31 as voltage 3 through buffer amplifier 25, and resistor R4,
The voltage at the connection point of Rs is the voltage V via the buffer amplifier 26.
4 is output from terminal 32, and the emitter voltage of transistor Q3 is buffered? The voltage is outputted from the terminal 33 via the 7-amp 27 as a voltage v5.

ここで、可変抵抗VRの摺動接点の出り電jモはユーゾ
の設定により可変さ°れる。
Here, the output voltage of the sliding contact of the variable resistor VR is varied by the setting of the variable resistor VR.

エツジカウンタ13のカウント値が小なるとき、トラン
ジスタQ1のベース電圧は高く、トランジスタQ1のエ
ミッタ電流が小さく、トランジスタQ3のエミッタ電流
が小さい。これににつて電圧v1〜Vs夫々の絶対値は
小である。
When the count value of the edge counter 13 becomes small, the base voltage of the transistor Q1 is high, the emitter current of the transistor Q1 is small, and the emitter current of the transistor Q3 is small. In this regard, the absolute values of each of the voltages v1 to Vs are small.

エツジカウンタ13のカウント値が大となると、トラン
ジスタQIのベース電圧は低くなり、トランジスタQ1
のエミッタ電流が増加し、トランジスタQ3のエミッタ
電流が増加する。これによって電圧V+−Vs夫々の絶
対値が人となる。
When the count value of the edge counter 13 becomes large, the base voltage of the transistor QI becomes low, and the transistor Q1
The emitter current of transistor Q3 increases, and the emitter current of transistor Q3 increases. As a result, the respective absolute values of the voltages V+-Vs become equal.

上記電源回路15の端子28〜33より出力される電圧
Vo”−VsはX駆動回路11及びY駆動回路12に供
給される。
The voltage Vo''-Vs outputted from the terminals 28 to 33 of the power supply circuit 15 is supplied to the X drive circuit 11 and the Y drive circuit 12.

X駆動回路11は水平走査周期毎に供給されるXデータ
をXデータシフト信号でシフトして、ラッチ信号のタイ
ミングで液晶パネル16の複数のX4g月電極に上記交
流化信号及びXデータに応じた電圧を電圧V o ”−
’V s中から切換選択して印加する。Y信号回路12
はYデータをラッチ信号のタイミングでシフトして液晶
パネル16の複数のY信号電圧に上記交流化信号及びY
データに応じた電圧を電圧Vo〜v5中から切換選択し
て印加する。
The X drive circuit 11 shifts the X data supplied in each horizontal scanning period using the X data shift signal, and applies the data to the plurality of X4g electrodes of the liquid crystal panel 16 at the timing of the latch signal in response to the AC signal and the X data. The voltage is the voltage V o ”−
'Vs Select and apply. Y signal circuit 12
shifts the Y data at the timing of the latch signal and applies the above AC signal and the Y data to the plurality of Y signal voltages on the liquid crystal panel 16.
A voltage corresponding to the data is selected and applied from voltages Vo to v5.

このように、エツジカウンタ13のカウント値が大なる
程、液晶パネル16に印加される電圧V o ” V 
s夫々の絶対値が大となるため、液晶パネル16の抵抗
・容量成分による印加電圧波形のなまりが補償され、表
示パターンに拘らず表示ドツトと非表示ドツトとの明暗
の輝度差が一定で表示画面が鮮明となる。
In this way, as the count value of the edge counter 13 increases, the voltage V o '' V applied to the liquid crystal panel 16 increases.
Since the absolute value of each of s becomes large, the rounding of the applied voltage waveform due to the resistance and capacitance components of the liquid crystal panel 16 is compensated for, and the brightness difference between display dots and non-display dots is constant regardless of the display pattern. The screen becomes clearer.

〔発明の効果〕〔Effect of the invention〕

上述の如く、本発明の液晶表示装置によれば、表示パタ
ーンに拘らず表示ドツトと非表示ドツトとの明暗の輝度
差が一定で表示画面が鮮明となり、実用上きわめて有用
である。
As described above, the liquid crystal display device of the present invention has a constant brightness difference between display dots and non-display dots regardless of the display pattern, resulting in a clear display screen, which is extremely useful in practice.

第2図は本発明装置の一実施例のブ[1ツク図、第3図
は電源回路の一実施例の回路図である。
FIG. 2 is a block diagram of one embodiment of the device of the present invention, and FIG. 3 is a circuit diagram of one embodiment of the power supply circuit.

図において、 10は液晶制御装置、 11はX駆動回路、 12はY駆動回路、 13はエツジカウンタ、 14はD/Aコンバータ、 15は電源回路、 16は液晶パネル をンバす。In the figure, 10 is a liquid crystal control device; 11 is an X drive circuit; 12 is a Y drive circuit; 13 is the edge counter, 14 is a D/A converter; 15 is a power supply circuit; 16 is the liquid crystal panel .

特許出願人 富 士 通 株式会社Patent applicant: Tomitsu Co., Ltd.

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

第1図は本発明装置の原理図、 本肥ヨ月さ(−萱の原理国 第1図 FIG. 1 is a diagram of the principle of the device of the present invention. Honbi Yozukisa (-Kaya no Principle Country) Figure 1

Claims (1)

【特許請求の範囲】 液晶パネル(3)を単純マトリクス方式で駆動する液晶
表示装置において、 一画面分の表示データの変化量を検出する検出手段(4
)と、 該検出手段(4)で得られた変化量が大なる程、該液晶
パネル(3)に印加する電圧の絶対値を大とする電圧印
加手段(5)とを有することを特徴とする液晶表示装置
[Claims] In a liquid crystal display device in which a liquid crystal panel (3) is driven in a simple matrix method, a detection means (4) for detecting an amount of change in display data for one screen is provided.
), and voltage application means (5) that increases the absolute value of the voltage applied to the liquid crystal panel (3) as the amount of change obtained by the detection means (4) increases. LCD display device.
JP21319388A 1988-08-26 1988-08-26 Liquid crystal display device Pending JPH0261612A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP21319388A JPH0261612A (en) 1988-08-26 1988-08-26 Liquid crystal display device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP21319388A JPH0261612A (en) 1988-08-26 1988-08-26 Liquid crystal display device

Publications (1)

Publication Number Publication Date
JPH0261612A true JPH0261612A (en) 1990-03-01

Family

ID=16635078

Family Applications (1)

Application Number Title Priority Date Filing Date
JP21319388A Pending JPH0261612A (en) 1988-08-26 1988-08-26 Liquid crystal display device

Country Status (1)

Country Link
JP (1) JPH0261612A (en)

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