JPH09212137A - Liquid crystal driving device - Google Patents
Liquid crystal driving deviceInfo
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- JPH09212137A JPH09212137A JP1786896A JP1786896A JPH09212137A JP H09212137 A JPH09212137 A JP H09212137A JP 1786896 A JP1786896 A JP 1786896A JP 1786896 A JP1786896 A JP 1786896A JP H09212137 A JPH09212137 A JP H09212137A
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- liquid crystal
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- short
- output terminals
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、液晶パネルを駆
動する液晶駆動装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal driving device for driving a liquid crystal panel.
【０００２】[0002]
【従来の技術】近年、多色表示、小型、軽量の携帯型パ
ーソナルコンピュータが開発されてきている。特に携帯
できることにより、作業場所を選ばずに使用することが
できるため、その利用はますます拡大しつつある。この
ようななかで、液晶パネルの駆動に用いる液晶駆動装置
はますます低消費電力のものが望まれてきている。2. Description of the Related Art In recent years, a portable personal computer having multicolor display, small size and light weight has been developed. In particular, since it is portable, it can be used in any place, and its use is expanding. Under such circumstances, a liquid crystal driving device used for driving a liquid crystal panel is required to have lower power consumption.
【０００３】従来、この種の液晶駆動装置は図５に示す
構成をとるものが一般的であった。この従来の液晶駆動
装置について、図３〜図５を参照しながら説明する。は
じめに液晶の基本駆動を説明する。図３は液晶の基本駆
動方法を示す図である。液晶は電気化学的特性により、
一定方向の電界を長時間印加し続けていると劣化する。
したがって、液晶に印加される電界の方向が一定周期毎
に逆方向になるように、図３の（ａ）と（ｂ）のように
電界の方向を変えなければならない。Conventionally, a liquid crystal driving device of this type generally has a structure shown in FIG. This conventional liquid crystal driving device will be described with reference to FIGS. First, the basic driving of the liquid crystal will be described. FIG. 3 is a diagram showing a basic driving method of liquid crystal. Liquid crystal has an electrochemical property,
It deteriorates when an electric field in a fixed direction is continuously applied for a long time.
Therefore, it is necessary to change the direction of the electric field as shown in FIGS. 3A and 3B so that the direction of the electric field applied to the liquid crystal becomes opposite in every constant period.
【０００４】液晶パネルにおける電界の印加方法には上
記の一定周期毎の反転駆動の他、パネルのドット単位で
の反転駆動が考えられる。図４は各種反転駆動方式の例
を示すもので、●と〇は互いに逆方向に電界が印加され
たドットを示し、（ａ）は反転駆動を全ドットを１フレ
ーム単位で同時に変化させるもの、（ｂ）は表示垂直方
向に１ライン毎に反転する方法であり、フレームが代わ
ればフレーム単位でも変化する。さらに（ｃ）は（ｂ）
に加え、水平方向のドット単位でも反転制御するもので
ある。各方式において、表示システムの構築性、画質の
優劣が異なるが、（ｃ）の駆動方式が最も高画質を得ら
れる。As a method of applying an electric field in a liquid crystal panel, inversion driving in dot units of the panel can be considered in addition to the inversion driving in the above-described constant cycle. FIG. 4 shows examples of various inversion driving methods. ● and ◯ indicate dots to which an electric field is applied in the opposite directions, and (a) shows that inversion driving changes all dots at the same time in 1-frame units. (B) is a method of reversing every line in the display vertical direction, and if the frame is changed, it also changes in frame units. Furthermore, (c) is (b)
In addition, inversion control is also performed in units of horizontal dots. Although the configurability of the display system and the superiority or inferiority of the image quality are different in each system, the drive system of (c) can obtain the highest image quality.
【０００５】図５は、図４（ｃ）の駆動方式を行なう従
来の液晶駆動装置の構成図であり、５０１は表示用メモ
リ、５０２は表示制御回路、５０３は表示用メモリ５０
１からの読みだし信号をビット反転するデータ反転制御
回路、５０４はシフトレジスタ、５０５，５０６は第
１，第２データラッチ、５０７は第２データラッチ５０
６のデジタルラッチデータをアナログに変換するデジタ
ル・アナログ変換手段、５０８はシフトレジスタ５０４
に入力するスタート信号、５０９はシフトレジスタ５０
４から出力されるキャリー信号、５１０はシフトレジス
タ５０４から順次出力されるシフト信号である。FIG. 5 is a block diagram of a conventional liquid crystal driving device which employs the driving method of FIG. 4C. 501 is a display memory, 502 is a display control circuit, and 503 is a display memory 50.
A data inversion control circuit that bit-inverts the read signal from 1; 504, a shift register; 505, 506, first and second data latches; and 507, a second data latch 50.
6, digital-analog conversion means for converting the digital latch data of 6 into analog, 508 is a shift register 504
To the shift register 50.
A carry signal 510 output from the shift register 4 is a shift signal sequentially output from the shift register 504.
【０００６】上記従来の液晶駆動装置について動作を説
明する。表示用メモリ５０１には表示するデータが蓄積
されており、表示制御回路５０２によりデータが読み出
される。読み出されたデータはデータ反転制御回路５０
３に入力され、液晶駆動方式に応じて反転、非反転制御
が行なわれる。次に、液晶駆動を構成する部分を説明す
る。シフトレジスタ５０４にスタート信号５０８が入力
されるとシフトレジスタ５０４からシフト信号５１０が
順次出力される。このシフト信号５１０は第１データラ
ッチ５０５へ入力され、ラッチのゲートを制御する。順
次ゲートを開くことでデータ反転制御回路５０３からの
データ信号を順次ラッチしていく。The operation of the above conventional liquid crystal driving device will be described. Display data is accumulated in the display memory 501, and the display control circuit 502 reads the data. The read data is the data inversion control circuit 50.
3 is input, and inversion / non-inversion control is performed according to the liquid crystal driving method. Next, a part which constitutes liquid crystal driving will be described. When the start signal 508 is input to the shift register 504, the shift signal 510 is sequentially output from the shift register 504. The shift signal 510 is input to the first data latch 505 and controls the gate of the latch. The data signals from the data inversion control circuit 503 are sequentially latched by sequentially opening the gates.
【０００７】１ライン分のデータを全ての第１データラ
ッチ５０５に入力した後、全ての第１データラッチ５０
５のデータを同時に第２データラッチ５０６に転送す
る。これは、表示用メモリ５０１からのデータが順次転
送されてくるため、次のラインのデータを第１データラ
ッチ５０５に入力していくために、データを第２データ
ラッチ５０６に移動させるものである。After the data for one line is input to all the first data latches 505, all the first data latches 50 are input.
5 data are simultaneously transferred to the second data latch 506. This is to move the data to the second data latch 506 in order to input the data of the next line to the first data latch 505 because the data from the display memory 501 is sequentially transferred. .
【０００８】第２データラッチ５０６の出力はデジタル
・アナログ変換手段５０７によってアナログ信号に変換
され、液晶パネルに加えられる。さて、液晶駆動方式の
うち、図４（ｃ）に相当するドット反転制御を行なう場
合、白ドットの位相を図２（ａ）に示し、黒ドットの位
相を図２（ｂ）に示す。ドット反転表示方式によると、
隣接する出力端子毎に反転した信号が出力されることに
なる。The output of the second data latch 506 is converted into an analog signal by the digital / analog conversion means 507 and applied to the liquid crystal panel. Now, in the liquid crystal driving method, when the dot inversion control corresponding to FIG. 4C is performed, the phase of white dots is shown in FIG. 2A and the phase of black dots is shown in FIG. 2B. According to the dot inversion display method,
An inverted signal is output for each adjacent output terminal.
【０００９】[0009]
【発明が解決しようとする課題】しかしながら、上記従
来の構成では、各デジタル・アナログ変換手段５０７毎
に反転制御を行なうことになり、デジタル・アナログ変
換手段５０７における消費電力が大きくなってしまう。
この発明は上記課題を解決するもので、消費電力を低減
できる液晶駆動装置を提供することを目的とする。However, in the above-mentioned conventional configuration, the inversion control is performed for each digital / analog conversion means 507, and the power consumption in the digital / analog conversion means 507 becomes large.
This invention solves the said subject, and it aims at providing the liquid crystal drive device which can reduce power consumption.
【００１０】[0010]
【課題を解決するための手段】請求項１記載の液晶駆動
装置は、液晶パネルに駆動信号を出力する複数の出力端
子を有し、隣接する出力端子毎に極性の反転した駆動信
号を出力し、かつ１走査期間毎に同一出力端子から出力
される駆動信号の極性を反転するようにした液晶駆動装
置であって、ブランキング期間に出力端子間を短絡する
短絡手段を設けたことを特徴とする。A liquid crystal driving device according to claim 1 has a plurality of output terminals for outputting a driving signal to a liquid crystal panel, and outputs a driving signal whose polarity is inverted for each adjacent output terminal. A liquid crystal drive device in which the polarities of the drive signals output from the same output terminal are inverted every scanning period, wherein short-circuit means for short-circuiting the output terminals during the blanking period is provided. To do.
【００１１】この構成によれば、ブランキング期間に短
絡手段により出力端子間を短絡することにより、同一出
力端子に印加される駆動信号を反転する際に、出力端子
間が短絡して同電位となるまでの期間の電力の消費はな
く、電力消費は、出力端子間が短絡して同電位となった
後、反転までの期間においてのみ発生し、出力端子間短
絡により同電位となった出力端子の電位は反転時の駆動
信号の電位に近くなっているので、駆動信号反転時の消
費電力を低減することができる。According to this structure, the output terminals are short-circuited by the short-circuiting means during the blanking period, so that when the drive signal applied to the same output terminal is inverted, the output terminals are short-circuited to have the same potential. There is no power consumption during the period until the output terminal becomes short. Since the potential of is close to the potential of the drive signal at the time of inversion, the power consumption at the time of inversion of the drive signal can be reduced.
【００１２】請求項２記載の液晶駆動装置は、請求項１
記載の液晶駆動装置において、ブランキング期間に出力
端子を浮遊状態にする切離し手段を設けている。この構
成により、本体の出力が短絡して、過電流が発生した
り、出力が不安定になることを防止することができる。A liquid crystal driving device according to a second aspect is the first aspect.
The liquid crystal drive device described above is provided with a disconnecting means that brings the output terminal into a floating state during the blanking period. With this configuration, it is possible to prevent the output of the main body from being short-circuited, resulting in an overcurrent or an unstable output.
【００１３】[0013]
【発明の実施の形態】以下、この発明の実施の形態につ
いて、図１および図２を参照しながら説明する。図１は
この発明の実施の形態の液晶駆動装置の構成図である。
図１において、１０１は出力端子間を相互に短絡する短
絡スイッチ（短絡手段）、１０２は出力端子をデジタル
・アナログ変換手段５０７から切り離して出力端子を浮
遊状態にする切離しスイッチ（切離し手段）であり、そ
の他は従来例と同じ構成のため同じ符号を付して説明を
省略する。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS. FIG. 1 is a configuration diagram of a liquid crystal drive device according to an embodiment of the present invention.
In FIG. 1, 101 is a short-circuiting switch (short-circuiting means) for short-circuiting the output terminals to each other, and 102 is a disconnecting switch (disconnecting means) for disconnecting the output terminal from the digital-analog conversion means 507 to put the output terminal in a floating state. Since the other configurations are the same as those of the conventional example, the same reference numerals are given and the description thereof is omitted.
【００１４】この液晶駆動装置は、対向電圧一定で、ド
ット反転を行う液晶パネルの駆動装置であり、図５の構
成に、短絡スイッチ１０１と切離しスイッチ１０２を付
加した構成である。この短絡スイッチ１０１と切離しス
イッチ１０２とは互いに開閉状態が逆のタイミングで行
われ、出力短絡制御信号により開閉状態が制御される。
出力短絡制御信号は、ブランキング期間において、切離
しスイッチ１０２を開状態にするとともに、短絡スイッ
チ１０１を閉状態にし、その他の期間では、開閉状態を
逆にする。なお、デジタル・アナログ変換手段５０７か
ら出力される出力信号は、図４（ｃ）のように、隣接し
た出力端子毎に反転した信号が出力される。This liquid crystal driving device is a driving device for a liquid crystal panel which performs dot inversion with a constant counter voltage, and has a structure in which a short circuit switch 101 and a disconnection switch 102 are added to the structure of FIG. The short-circuit switch 101 and the disconnection switch 102 are opened and closed at opposite timings, and the open-close state is controlled by the output short-circuit control signal.
The output short-circuit control signal causes the disconnection switch 102 to be in the open state and the short-circuit switch 101 to be in the closed state during the blanking period, and reverses the open / closed state during the other periods. The output signal output from the digital-analog converter 507 is an inverted signal for each adjacent output terminal as shown in FIG. 4C.
【００１５】図２はこの液晶駆動装置の動作を説明する
ためのタイミング図である。図２の（ａ）および（ｂ）
は従来の液晶駆動装置の隣接する出力端子からの出力信
号を示す。（ｃ）はこの実施の形態におけるスイッチ１
０１，１０２の開閉を制御する出力短絡制御信号を示
す。（ｄ）および（ｅ）はこの実施の形態の液晶駆動装
置の隣接する出力端子からの出力信号を示す。FIG. 2 is a timing chart for explaining the operation of this liquid crystal drive device. 2 (a) and (b)
Indicates an output signal from an adjacent output terminal of the conventional liquid crystal driving device. (C) is the switch 1 in this embodiment
The output short-circuit control signal which controls opening and closing of 01 and 102 is shown. (D) and (e) show output signals from adjacent output terminals of the liquid crystal drive device of this embodiment.
【００１６】図２において、ｔ1 〜ｔ3 の間がブランキ
ング期間であり、時刻ｔ1 までは、出力短絡信号がハイ
レベル“Ｈ”で、切離しスイッチ１０２は閉状態（オ
ン）、短絡スイッチ１０１は開状態（オフ）であり、従
来と同じ回路構成となり、デジタル・アナログ変換手段
５０７から切離しスイッチ１０２および出力端子を介し
て出力される出力信号（ｄ），（ｅ）は、従来の出力信
号（ａ），（ｂ）と同じである。[0016] In FIG. 2, a blanking period between t 1 ~t 3, until time t 1, the output short circuit signal is at the high level "H", trip switch 102 is closed (ON), the short-circuit switch 101 is in an open state (OFF), has the same circuit configuration as the conventional one, and the output signals (d) and (e) output from the digital / analog conversion means 507 via the switch 102 and the output terminal are the conventional output. It is the same as the signals (a) and (b).
【００１７】そして、時刻ｔ1 のタイミングで、出力短
絡制御信号がローレベル“Ｌ”に切り換わり、切離しス
イッチ１０２はオフし、短絡スイッチ１０１はオンす
る。切離しスイッチ１０２がオフすることにより、デジ
タル・アナログ変換手段５０７と出力端子とが電気的に
切り離され、短絡スイッチ１０１がオンすることによ
り、出力端子間が電気的に接続されて端子間で電荷が移
動し、時刻ｔ2 で出力信号（ｄ）と（ｅ）は同電位とな
る。ここで、ｔ1 〜ｔ2 間は出力端子間で電荷が移動す
るため、電力は消費されない。Then, at the timing of time t 1 , the output short circuit control signal is switched to the low level "L", the disconnection switch 102 is turned off, and the short circuit switch 101 is turned on. When the disconnection switch 102 is turned off, the digital-analog conversion means 507 and the output terminal are electrically disconnected, and when the short-circuit switch 101 is turned on, the output terminals are electrically connected and electric charge is generated between the terminals. After moving, the output signals (d) and (e) have the same potential at time t 2 . Here, since the electric charge moves between the output terminals during t 1 to t 2 , no electric power is consumed.
【００１８】つぎに、時刻ｔ3 のタイミングで、出力短
絡制御信号がハイレベル“Ｈ”に切り換わり、切離しス
イッチ１０２はオンし、短絡スイッチ１０１はオフする
ことにより、時刻ｔ1 までの回路状態と同じになり、デ
ジタル・アナログ変換手段５０７が負荷の電荷を充放電
し、電力が消費され、時刻ｔ4 で出力信号（ｄ）と
（ｅ）は所望の電位となる。Next, at the timing of time t 3 , the output short circuit control signal is switched to the high level "H", the disconnection switch 102 is turned on, and the short circuit switch 101 is turned off, so that the circuit state until the time t 1 is reached. In the same manner as above, the digital-analog conversion means 507 charges and discharges the electric charge of the load, power is consumed, and the output signals (d) and (e) become the desired potentials at time t 4 .
【００１９】ドット単位の反転を行うときに、従来の出
力信号（ａ），（ｂ）となる図５の構成では、ｔ3 〜ｔ
5 の期間において、デジタル・アナログ変換手段５０７
で電力消費が発生する。これに対して、この実施の形態
によれば、ｔ1 〜ｔ4 の期間において反転を行うが、ｔ
1 〜ｔ3 のブランキング期間では、切離しスイッチ１０
２がオフで短絡スイッチ１０１がオンとなり、デジタル
・アナログ変換手段５０７と出力端子とが切り離され、
出力端子間が短絡されているため、この期間の電力の消
費はない。電力消費は、出力端子間が短絡して同電位と
なった後、反転までのｔ3 〜ｔ4 の期間において発生す
るが、端子間短絡により同電位となった出力端子の電位
は反転時の出力信号の電位に近くなっているので、ｔ3
〜ｔ4 の期間におけるデジタル・アナログ変換手段５０
７の消費電力は小さくなり、消費電力を低減することが
できる。In the configuration shown in FIG. 5, in which the output signals (a) and (b) of the related art are obtained when the dot unit inversion is performed, t 3 to t
During period 5 , digital / analog conversion means 507
Power consumption occurs. On the other hand, according to this embodiment, inversion is performed in the period of t 1 to t 4 ,
In the blanking period of 1 to t 3 , the disconnection switch 10
2 is turned off, the short-circuit switch 101 is turned on, the digital-analog conversion means 507 and the output terminal are disconnected,
Since the output terminals are short-circuited, no power is consumed during this period. Power consumption occurs during the period from t 3 to t 4 after the output terminals are short-circuited to have the same potential and then to the inversion. Since it is close to the potential of the output signal, t 3
Digital-to-analog conversion means 50 in the period from t 4 to t 4.
The power consumption of No. 7 is small, and the power consumption can be reduced.
【００２０】なお、各デジタル・アナログ変換手段５０
７は、それぞれ独立した任意の電圧が各出力端子から出
力されているため、切離しスイッチ１０２をオンした状
態で、短絡スイッチ１０１をオンすると、デジタル・ア
ナログ変換手段５０７の出力が短絡してしまい、過電流
が発生したり、出力が不安定になることがあるため、短
絡スイッチ１０１をオンするときには切離しスイッチ１
０２をオフするようにしている。Each digital / analog conversion means 50
Since the independent arbitrary voltages of 7 are output from the respective output terminals, if the short-circuit switch 101 is turned on while the disconnection switch 102 is turned on, the output of the digital / analog conversion means 507 is short-circuited, When the short circuit switch 101 is turned on, the disconnection switch 1 may be generated because overcurrent may occur or the output may become unstable.
02 is turned off.
【００２１】[0021]
【発明の効果】この発明の液晶駆動装置は、ブランキン
グ期間において、短絡手段により出力端子間を短絡する
ことにより、同一出力端子に印加される駆動信号を反転
する際に、出力端子間が短絡して同電位となるまでの期
間の電力の消費はなく、電力消費は、出力端子間が短絡
して同電位となった後、反転までの期間においてのみ発
生し、出力端子間短絡により同電位となった出力端子の
電位は反転時の駆動信号の電位に近くなっているので、
駆動信号反転時の消費電力を低減することができる。According to the liquid crystal drive device of the present invention, the output terminals are short-circuited by the short-circuiting means during the blanking period so that the output terminals are short-circuited when the drive signal applied to the same output terminal is inverted. There is no power consumption during the period until the same potential is reached, and power consumption occurs only during the period until the inversion after the output terminals are short-circuited to the same potential and the same potential is generated due to the short circuit between the output terminals. Since the potential of the output terminal that became is close to the potential of the drive signal at the time of inversion,
It is possible to reduce power consumption when the drive signal is inverted.
【００２２】さらに、ブランキング期間に、切離し手段
により出力端子を浮遊状態にすることより、本体の出力
が短絡して、過電流が発生したり、出力が不安定になる
ことを防止することができる。Further, during the blanking period, it is possible to prevent the output of the main body from being short-circuited to cause an overcurrent or the output from becoming unstable by making the output terminal floating by the disconnecting means. it can.
【図１】この発明の実施の形態の液晶駆動装置の構成
図。FIG. 1 is a configuration diagram of a liquid crystal drive device according to an embodiment of the present invention.
【図２】この発明の実施の形態の液晶駆動装置の動作を
説明するためのタイミング図。FIG. 2 is a timing chart for explaining the operation of the liquid crystal drive device according to the embodiment of the present invention.
【図３】液晶の基本駆動方法を示す図。FIG. 3 is a diagram showing a basic driving method of liquid crystal.
【図４】各種反転駆動方式を示す図。FIG. 4 is a diagram showing various inversion driving methods.
【図５】従来の液晶駆動装置の構成図。FIG. 5 is a configuration diagram of a conventional liquid crystal drive device.
１０１ 短絡スイッチ（短絡手段） １０２ 切離しスイッチ（切離し手段） ５０１ 表示用メモリ ５０２ 表示制御回路 ５０３ データ反転制御回路 ５０４ シフトレジスタ ５０５ 第１データラッチ ５０６ 第２データラッチ ５０７ デジタル・アナログ変換手段 ５０８ スタート信号 ５０９ キャリー信号 ５１０ シフト信号 101 short-circuit switch (short-circuit means) 102 disconnection switch (separation means) 501 display memory 502 display control circuit 503 data inversion control circuit 504 shift register 505 first data latch 506 second data latch 507 digital / analog conversion means 508 start signal 509 Carry signal 510 shift signal
Claims (2)
出力端子を有し、隣接する前記出力端子毎に極性の反転
した駆動信号を出力し、かつ１走査期間毎に同一出力端
子から出力される駆動信号の極性を反転するようにした
液晶駆動装置であって、 ブランキング期間に前記出力端子間を短絡する短絡手段
を設けたことを特徴とする液晶駆動装置。1. A liquid crystal panel having a plurality of output terminals for outputting a drive signal, each adjacent output terminal outputs a drive signal of which polarity is inverted, and is output from the same output terminal every scanning period. A liquid crystal driving device in which the polarity of a driving signal is inverted, and a liquid crystal driving device is provided with short-circuiting means for short-circuiting the output terminals during a blanking period.
にする切離し手段を設けた請求項１記載の液晶駆動装
置。2. The liquid crystal drive device according to claim 1, further comprising a disconnecting means for bringing the output terminal into a floating state during the blanking period.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1786896A JPH09212137A (en) | 1996-02-02 | 1996-02-02 | Liquid crystal driving device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1786896A JPH09212137A (en) | 1996-02-02 | 1996-02-02 | Liquid crystal driving device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09212137A true JPH09212137A (en) | 1997-08-15 |
Family
ID=11955659
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1786896A Pending JPH09212137A (en) | 1996-02-02 | 1996-02-02 | Liquid crystal driving device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09212137A (en) |
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