JPH03230116A - High-voltage bias circuit for driving liquid crystal - Google Patents
High-voltage bias circuit for driving liquid crystalInfo
- Publication number
- JPH03230116A JPH03230116A JP2553990A JP2553990A JPH03230116A JP H03230116 A JPH03230116 A JP H03230116A JP 2553990 A JP2553990 A JP 2553990A JP 2553990 A JP2553990 A JP 2553990A JP H03230116 A JPH03230116 A JP H03230116A
- Authority
- JP
- Japan
- Prior art keywords
- operational amplifier
- amplifier circuit
- liquid crystal
- voltage
- driving
- 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
Links
- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 34
- 230000015556 catabolic process Effects 0.000 description 1
Landscapes
- Liquid Crystal Display Device Control (AREA)
- Control Of Voltage And Current In General (AREA)
- Liquid Crystal (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、液晶表示装置等に用いる液晶駆動用高電圧バ
イアス回路に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a high voltage bias circuit for driving liquid crystal used in liquid crystal display devices and the like.
本発明は、液晶駆動用のバイアス回路を、高圧側（Ｖ＋
、Ｖｚ）と低圧側（Ｖｚ、Ｖｎ）に分けることにより、
バイアス回路に高電圧を供給できるようにしたものであ
る。In the present invention, the bias circuit for driving the liquid crystal is connected to the high voltage side (V+
, Vz) and low pressure side (Vz, Vn),
This allows high voltage to be supplied to the bias circuit.
第２図に示すように、液晶駆動用のバイアス回路は、一
つのオペアンプ回路４で構成することが知られている。As shown in FIG. 2, it is known that a bias circuit for driving a liquid crystal is composed of one operational amplifier circuit 4.
しかし、従来の液晶駆動バイアス回路は、１個のオペア
ンプ回路を利用し、その十電源端子ＶＣＣを、液晶駆動
の最高電位に相当する電圧ＶＬＣＤに、電源端子ＶＳＳ
を接地電位として使用する為、液晶駆動用最高単位ＶＢ
ｇが、オペアンプ回路４の電源電圧の耐圧に相当するよ
うになる。液晶の表示装置の増大に伴って、この電圧■
１６．は増加する。カラー化等の条件により液晶駆動用
最高電位Ｖ ＬＣＤは、さらに増加する傾向にあり、ま
すます高耐圧のオペアンプが必要となる。However, the conventional liquid crystal drive bias circuit uses one operational amplifier circuit, and connects the power supply terminal VCC to the voltage VLCD corresponding to the highest potential of the liquid crystal drive.
Since VB is used as the ground potential, the highest unit for driving the liquid crystal
g corresponds to the withstand voltage of the power supply voltage of the operational amplifier circuit 4. With the increase in liquid crystal display devices, this voltage
16. increases. Due to conditions such as colorization, the highest potential for driving liquid crystals (VLCD) tends to further increase, and operational amplifiers with higher withstand voltages are required.
そこで本発明は、従来のこのような欠点を解決するため
、前記オペアンプ回路４を２つに分けて、高耐圧な回路
を構成し、液晶の動作電圧増加に対応することを目的と
している。Therefore, in order to solve these conventional drawbacks, the present invention aims to divide the operational amplifier circuit 4 into two parts to form a circuit with high withstand voltage to cope with the increase in the operating voltage of the liquid crystal.
上記課題を解決するため、オペアンプのバイアス回路を
高圧側（Ｖｌ、Ｖ２）と低圧側（Ｖ３．Ｖ、）に分けて
バイアス回路を構成することにより、はぼ１ケのオペア
ンプの耐圧の２倍まで、液晶駆動用最高電位を増加でき
るようにした。In order to solve the above problem, by configuring the bias circuit of the operational amplifier by dividing it into the high voltage side (Vl, V2) and the low voltage side (V3. The maximum potential for driving liquid crystals can be increased up to
上記のように、バイアス回路のオペアンプを高圧側と低
圧側に分けたために、液晶駆動用最高電位の〃のみが、
１ケのオペアンプに印加されることになり、実質上、バ
イアス回路の耐圧を２倍に増加できる。As mentioned above, since the bias circuit operational amplifier is divided into high voltage side and low voltage side, only the highest potential for driving the liquid crystal is
Since the voltage is applied to one operational amplifier, the withstand voltage of the bias circuit can be practically doubled.
以下に、本発明の実施例を図面に基づいて説明する。 Embodiments of the present invention will be described below based on the drawings.
第１図において、液晶駆動用最高電位Ｖ ＬＣＤは、最
高電位を示し、接地電位に対して正電圧に印加されるも
のとする。第１のオペアンプ回路の十電源端子ａは、液
晶駆動用最高電位ＶＬｅＤに接続する。−を源端子すは
、後述する第２のオペアンプ回路の出力ｅに接続する。In FIG. 1, the highest potential for driving liquid crystal VLCD indicates the highest potential, and is assumed to be applied at a positive voltage with respect to the ground potential. A power supply terminal a of the first operational amplifier circuit is connected to the highest potential for driving the liquid crystal VLeD. - is connected to the output e of a second operational amplifier circuit, which will be described later.
第１のオペアンプ回路の出力Ｃには、液晶駆動用最高電
位Ｖ ＬＣＤと、接地電位を分割抵抗Ｒ１，Ｒ１で設定
された電圧が発生する。この電圧は、通常液晶駆動用最
高電位Ｖ ＬＣＩ＋の％程度に設定する。第１のオペア
ンプ回路の出力Ｃは、第２のオペアンプ回路の十電源端
子ｅの’ＫＮとなる。第２のオペアンプ回路の一電源端
子ｄは接地電位に接続する。第２のオペアンプ回路の出
力ｆは分割抵抗Ｖ、、Ｖ４で決められる電圧が発生する
。通常ｆは出力Ｃより２〜３ｖ低めの電圧になるように
設定する。第２のオペアンプ回路の出力ｆは、前記第１
のオペアンプ回路の電源端子すに接続する。At the output C of the first operational amplifier circuit, a voltage is generated which is the highest potential for driving the liquid crystal VLCD and a ground potential set by dividing resistors R1 and R1. This voltage is normally set to about % of the highest potential for driving the liquid crystal VLCI+. The output C of the first operational amplifier circuit becomes 'KN' of the power supply terminal e of the second operational amplifier circuit. One power supply terminal d of the second operational amplifier circuit is connected to ground potential. The output f of the second operational amplifier circuit generates a voltage determined by the dividing resistors V, , V4. Normally, f is set to a voltage 2 to 3 V lower than output C. The output f of the second operational amplifier circuit is
Connect to the power supply terminal of the operational amplifier circuit.
ここで、各電位関係を示すと、
第１のオペアンプ回路の
＋電源端子ａ″″Ｖ Ｌｅｅ
−電源端子ｂ ＝ ＶＣ−３
の電圧が印加されており、ｖｃ＝ｖＬｏ／２とすれば、
第１のオペアンプ回路の電源端子間電圧は、ａ−ｂ＝Ｖ
Ｌｃｅ ＶＬＣ／Ｄ／２＋３＃ＶＬＣ１１／２の電源
で動作しており、はぼ液晶駆動用最高電位Ｖ ＬＣＤの
半分が印加されていることになる。オペアンプ回路２の
ｔｆｌ端子間電圧もやはり、液晶駆動用最高電位Ｖ Ｌ
Ｃ１＋の半分が印加されている。Here, to show each potential relationship, if the voltage of +power supply terminal a''"V Lee -power supply terminal b = VC-3 of the first operational amplifier circuit is applied, and vc = vLo/2,
The voltage between the power supply terminals of the first operational amplifier circuit is a−b=V
It operates with a power source of Lce VLC/D/2+3#VLC11/2, and half of the highest potential for driving liquid crystal VLCD is applied thereto. The voltage between the tfl terminals of the operational amplifier circuit 2 is also the highest potential for driving the liquid crystal V L
Half of C1+ is applied.
第３のオペアンプ回路の十電源端子ｇは、液晶駆動用最
高電位Ｖ ＬＣＤに、−電子端子りは前記第２のオペア
ンプ回路の出力ｆに各々接続する。第３のオペアンプ回
路は、分割抵抗Ｒ２〜Ｒ７により、液晶駆動用のバイア
ス電源Ｖ３、Ｖ４を発生させる。The power terminal g of the third operational amplifier circuit is connected to the highest potential VLCD for driving the liquid crystal, and the negative terminal is connected to the output f of the second operational amplifier circuit. The third operational amplifier circuit generates bias power supplies V3 and V4 for driving the liquid crystal using dividing resistors R2 to R7.
第４のオペアンプ回路の十電′ａ端子ｉは前記第２のオ
ペアンプ回路の出力ｆに接続する。−電源端子ｊは接地
する。第４のオペアンプ回路は同様に分割抵抗Ｒ６〜Ｒ
７により、液晶駆動用のバイアス電源Ｖ ３ 、 Ｖ
ａを発生する。A terminal i of the fourth operational amplifier circuit is connected to the output f of the second operational amplifier circuit. - Power supply terminal j is grounded. Similarly, the fourth operational amplifier circuit has dividing resistors R6 to R.
7, bias power supplies V 3 and V for driving the liquid crystal
generate a.
第１図から明らかなように、第３及び第４のオペアンプ
回路はともに、液晶駆動用最高電位■、。As is clear from FIG. 1, both the third and fourth operational amplifier circuits are at the highest potential for driving the liquid crystal.
の半分の電源電圧で動作していることになる。ここで、
分割抵抗Ｒ２〜Ｒ１は、通常の電圧変均法に従った分割
比に設定する。This means that it is operating at half the power supply voltage. here,
The dividing resistors R2 to R1 are set at a dividing ratio according to a normal voltage equalization method.
前述したような回路構成にすることにより、オペアンプ
回路の電源端子間耐圧が、低いものでも見かけ上の耐圧
が２倍に増加でき、高デユティ−化や、カラー化による
液晶パネルの動作電圧増加によも充分対応して駆動でき
る。又、第２のオペアンプ回路をオペアンプで構成しで
あるため、出力ｆに流れるフォース及びシンク電流にも
安定した電圧が得られ、液晶の表示品質に好結果をもた
らす。By configuring the circuit as described above, the apparent withstand voltage can be doubled even if the voltage between the power supply terminals of the operational amplifier circuit is low, making it possible to increase the operating voltage of liquid crystal panels due to higher duty cycles and colorization. It can be driven very well. Furthermore, since the second operational amplifier circuit is constituted by an operational amplifier, a stable voltage can be obtained for the force and sink current flowing to the output f, resulting in good results for the display quality of the liquid crystal.
本発明は、以上説明したように、オペアンプ回路を複数
個使用して、非常にシンプルな回路で高耐圧な液晶駆動
バイアス回路が作れる。耐圧も２倍に引き上げられるた
め、はとんどの液晶表示パネルの駆動に対応ができる。As described above, the present invention uses a plurality of operational amplifier circuits to create a high-voltage liquid crystal drive bias circuit with a very simple circuit. Since the breakdown voltage has been doubled, it can be used to drive most liquid crystal display panels.
第１図は本発明の液晶駆動用高電圧バイアス回路の実施
例、第２図は従来技術による液晶駆動バイアス回路をそ
れぞれ示す。
・第１のオペアンプ回路
・第２のオペアンプ回路
・第３のオペアンプ回路
・第４のオペアンプ回路
以上FIG. 1 shows an embodiment of a high voltage bias circuit for driving a liquid crystal according to the present invention, and FIG. 2 shows a bias circuit for driving a liquid crystal according to the prior art.・First operational amplifier circuit・Second operational amplifier circuit・Third operational amplifier circuit・Fourth operational amplifier circuit and above
Claims (1)
位を＋電源端子とし、後述する第２のオペアンプ回路の
出力を−電源端子として、液晶駆動用最高電位を分割し
た出力を持つ第１のオペアンプ回路と、前記第１のオペ
アンプ回路の出力を＋電源端子とし、接地電位を−電源
端子とし、出力を前記第１のオペアンプ回路の−電源端
子に帰還させた第２のオペアンプ回路と、液晶駆動用最
高電位を＋電源端子とし、−電源端子に前記第２のオペ
アンプ回路の出力を接続しバイアス電圧Ｖ＿１、Ｖ＿２
を発生させる第３のオペアンプ回路と、前記第２のオペ
アンプ回路の出力を＋電源端子に、−電源端子を接地し
バイアス電圧Ｖ＿３、Ｖ＿４を発生させる第４のオペア
ンプ回路から構成する液晶駆動用高電圧バイアス回路。In the bias circuit for driving the liquid crystal, the highest potential for driving the liquid crystal is set as a + power supply terminal, and the output of a second operational amplifier circuit, which will be described later, is set as the - power supply terminal, and the first operational amplifier circuit has an output obtained by dividing the highest potential for driving the liquid crystal. and a second operational amplifier circuit in which the output of the first operational amplifier circuit is used as a + power supply terminal, the ground potential is used as a − power supply terminal, and the output is fed back to the − power supply terminal of the first operational amplifier circuit, and a second operational amplifier circuit for driving a liquid crystal. The highest potential is the + power supply terminal, the output of the second operational amplifier circuit is connected to the - power supply terminal, and the bias voltages V_1, V_2 are set.
a third operational amplifier circuit that generates bias voltages V_3 and V_4, and a fourth operational amplifier circuit that connects the output of the second operational amplifier circuit to the + power supply terminal and grounds the - power supply terminal and generates bias voltages V_3 and V_4. Voltage bias circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2553990A JPH03230116A (en) | 1990-02-05 | 1990-02-05 | High-voltage bias circuit for driving liquid crystal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2553990A JPH03230116A (en) | 1990-02-05 | 1990-02-05 | High-voltage bias circuit for driving liquid crystal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03230116A true JPH03230116A (en) | 1991-10-14 |
Family
ID=12168806
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2553990A Pending JPH03230116A (en) | 1990-02-05 | 1990-02-05 | High-voltage bias circuit for driving liquid crystal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03230116A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996021879A1 (en) * | 1995-01-13 | 1996-07-18 | Seiko Epson Corporation | Power supply circuit, power supply for liquid crystal display, and liquid crystal display |
| EP0772182A2 (en) * | 1995-10-04 | 1997-05-07 | Sharp Kabushiki Kaisha | Display-driving voltage generating apparatus |
| US6028598A (en) * | 1993-05-10 | 2000-02-22 | Kabushiki Kaisha Toshiba | Liquid crystal driving power supply circuit |
| WO2012127934A1 (en) * | 2011-03-23 | 2012-09-27 | シャープ株式会社 | Driving device and display device |
-
1990
- 1990-02-05 JP JP2553990A patent/JPH03230116A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6028598A (en) * | 1993-05-10 | 2000-02-22 | Kabushiki Kaisha Toshiba | Liquid crystal driving power supply circuit |
| WO1996021879A1 (en) * | 1995-01-13 | 1996-07-18 | Seiko Epson Corporation | Power supply circuit, power supply for liquid crystal display, and liquid crystal display |
| US6188395B1 (en) * | 1995-01-13 | 2001-02-13 | Seiko Epson Corporation | Power source circuit, power source for driving a liquid crystal display, and a liquid crystal display device |
| KR100290075B1 (en) * | 1995-01-13 | 2001-05-15 | 야스카와 히데아키 | Power supply circuit, power supply for driving liquid crystal display and liquid crystal display device |
| EP0772182A2 (en) * | 1995-10-04 | 1997-05-07 | Sharp Kabushiki Kaisha | Display-driving voltage generating apparatus |
| EP0772182A3 (en) * | 1995-10-04 | 1997-05-14 | Sharp Kabushiki Kaisha | Display-driving voltage generating apparatus |
| US5781001A (en) * | 1995-10-04 | 1998-07-14 | Sharp Kabushiki Kaisha | Display-driving voltage generating apparatus |
| WO2012127934A1 (en) * | 2011-03-23 | 2012-09-27 | シャープ株式会社 | Driving device and display device |
| JP2012198440A (en) * | 2011-03-23 | 2012-10-18 | Sharp Corp | Drive unit and display device |
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