JPS61162028A - Liquid crystal driving circuit - Google Patents
Liquid crystal driving circuitInfo
- Publication number
- JPS61162028A JPS61162028A JP216985A JP216985A JPS61162028A JP S61162028 A JPS61162028 A JP S61162028A JP 216985 A JP216985 A JP 216985A JP 216985 A JP216985 A JP 216985A JP S61162028 A JPS61162028 A JP S61162028A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- voltage
- resistors
- crystal driving
- display quality
- 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
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は液晶駆動回路に係り、特に時分割数が大きく、
大型のマトリクスタイプの液晶表示素子に好適な液晶駆
動電圧供給用の液晶駆動用電源回路に関するものである
。[Detailed Description of the Invention] (Industrial Field of Application) The present invention relates to a liquid crystal drive circuit, particularly when the number of time divisions is large.
The present invention relates to a liquid crystal driving power supply circuit for supplying liquid crystal driving voltage suitable for large matrix type liquid crystal display elements.
（従来の技術）
近年、パーソナルコンピュータやワードプロセッサの普
及に伴い、低消費電力であり、かつ、フラットディスプ
レイであるという特徴を生かした液晶表示モジュールの
採用が増えている。(Prior Art) In recent years, with the spread of personal computers and word processors, the adoption of liquid crystal display modules that take advantage of their characteristics of low power consumption and flat displays has been increasing.
また、それに伴い、液晶表示パネルの大型化の傾向が進
み、表示品質の向上が強く要望されている。Additionally, along with this, there is a trend toward larger liquid crystal display panels, and there is a strong demand for improved display quality.
以下、図面を参照しながら従来の液晶駆動電圧供給用の
電源回路について説明する。Hereinafter, a conventional power supply circuit for supplying liquid crystal driving voltage will be described with reference to the drawings.
第２図は従来の液晶駆動回路の構成図であり。FIG. 2 is a block diagram of a conventional liquid crystal drive circuit.
５は液晶駆動用電源、 ６ａ、６ｂ、６ｃ、６ｄ、６ｅ
は駆動用電源５の分割抵抗であり、一般に液晶駆動には
複数個の基準電源が必要なため、液晶駆動用電源５を分
割抵抗で分割して、電圧の高い順にＶ。１Ｖ１ｔＶ２１
Ｖ、、Ｖ４．Ｖ、とする複数個の基準電源を作る。７ａ
、 ７ｂ 。5 is a power supply for driving the liquid crystal, 6a, 6b, 6c, 6d, 6e
is a dividing resistor of the driving power supply 5. Generally, a plurality of reference power supplies are required to drive the liquid crystal, so the liquid crystal driving power supply 5 is divided by the dividing resistor and the voltages are set to V in descending order of voltage. 1V1tV21
V,,V4. Create multiple reference power supplies of V. 7a
, 7b.
７ｃ 、 ７ｄは分割抵抗で作られた各基準電源の増幅
器であり、一般にオペアンプをボルテージフォロワとし
て使用する。（特開昭５８−１９５８８８）一般に、マ
トリクス形式の液晶の駆動は電圧平均化法が用いられる
。（電圧平均化法については、例えば、「液晶の最新技
術ＪＰ１０６、工業調査会、松本・角田共著、がある。Reference numerals 7c and 7d are amplifiers for each reference power source made of divided resistors, and generally use an operational amplifier as a voltage follower. (Japanese Unexamined Patent Publication No. 58-195888) Generally, a voltage averaging method is used to drive a matrix type liquid crystal. (For the voltage averaging method, for example, there is "Latest Technology of Liquid Crystals JP106, Kogyo Kenkyukai, co-authored by Matsumoto and Tsunoda.
）
電圧平均化法では、時分割数をｎ、１フレ一ム期間を２
Ｔ、また、各基準電圧を、
と設定すれば、
ａ＝−７７＋１ （２）の条件の時に、
液晶パネルの選択点の実効電圧値ＶＯＮと、非選択点の
実効電圧値Ｖ。Ｆ、の比αが最大となることが知られて
いる。この時のＶ。ＮｙＶ。Ｆ２の一例、およびαをそ
れぞれ（３）式、（４）式、（５）式に示す。) In the voltage averaging method, the number of time divisions is n, and the period of one frame is 2.
T, and if each reference voltage is set as , then under the condition of a=-77+1 (2),
The effective voltage value VON at the selected point and the effective voltage value V at the non-selected point of the liquid crystal panel. It is known that the ratio α of F is the maximum. V at this time. NyV. An example of F2 and α are shown in equations (3), (4), and (5), respectively.
すなわち、電圧平均化法によれば、液晶パネルが大画面
化し、時分割数ｎが増えてくるとｖｏえとＶＯＰＦの比
αが小さくなるので、微妙な基準電圧のずれが液晶の表
示品質に大きく影響を及ぼすようになる。In other words, according to the voltage averaging method, as the screen of the liquid crystal panel becomes larger and the number of time divisions n increases, the ratio α of VOPF to VOPF becomes smaller, so a slight deviation in the reference voltage will greatly affect the display quality of the liquid crystal. come to have an influence.
（発明が解決しようとする問題点）
このような従来の回路では、分割抵抗として精度の良い
金属被膜抵抗等を使っているが、それでも、抵抗値には
必ず誤差が存在するため、基準電圧設定に誤差が生じ、
液晶パネルが大型化した場合、この残された誤差が液晶
の表示品質を著しく劣化させる。(Problem to be solved by the invention) In such conventional circuits, highly accurate metal film resistors are used as dividing resistors, but even so, there is always an error in the resistance value, so it is difficult to set the reference voltage. An error occurs,
When a liquid crystal panel becomes larger, this remaining error significantly deteriorates the display quality of the liquid crystal.
本発明はかかる点に鑑みてなされたもので、簡単な構成
で上記誤差を取り除くことを目的としている。The present invention has been made in view of this point, and an object of the present invention is to eliminate the above-mentioned error with a simple configuration.
（問題点を解決するための手段）
本発明は上記問題点を解決するためは、液晶駆動用電源
と、前記液晶駆動用電源の電圧を分割する複数個の抵抗
を有し、前記複数個の抵抗を調整するための抵抗調整手
段を具備することを特徴とした液晶駆動回路である。(Means for Solving the Problems) In order to solve the above problems, the present invention includes a liquid crystal driving power source and a plurality of resistors that divide the voltage of the liquid crystal driving power source, and the plurality of resistors divide the voltage of the liquid crystal driving power source. This is a liquid crystal drive circuit characterized by comprising a resistance adjustment means for adjusting resistance.
（作用）
本発明は前記した構成により、基準電圧に残存している
電圧誤差を取り除くことにより、大画面液晶パネルの表
示品質の向上を図るものである。(Function) The present invention aims to improve the display quality of a large screen liquid crystal panel by removing voltage errors remaining in the reference voltage using the above-described configuration.
（実施例）
第１図は本発明の液晶駆動回路における液晶駆動電圧供
給用の電源回路の構成を示す一実施例図であり、１は液
晶駆動用電源、２ａ、２ｂ、２ｃ、２ｄ、２ｅは液晶駆
動用電源１の分割抵抗であり、液晶駆動用電源１を分割
して基準電源Ｖｏ＋Ｖｘ、ｖｚ、Ｖｉ−ｖ＊、Ｖｓを得
ている。３ａ 、 ３ｂ 、 ３ｃ 、 ３ｄ 、 ３
ｅは各分割抵抗の調整手段であり、本実施例では分割抵
抗を半固定抵抗で構成することにより、抵抗調整手段を
実現している。４ａ、４ｂ、４ｃ、４ｄは分割抵抗で作
られた各基準電源の増幅器であり、オペアンプをボルテ
ージフォロワとして利用している。(Embodiment) FIG. 1 is an embodiment diagram showing the configuration of a power supply circuit for supplying liquid crystal drive voltage in a liquid crystal drive circuit of the present invention, in which 1 is a power supply for liquid crystal drive, 2a, 2b, 2c, 2d, 2e. is a dividing resistor of the liquid crystal driving power source 1, which divides the liquid crystal driving power source 1 to obtain reference power sources Vo+Vx, vz, Vi-v*, and Vs. 3a, 3b, 3c, 3d, 3
Reference character e represents adjustment means for each divided resistor, and in this embodiment, the resistance adjustment means is realized by configuring the divided resistors with semi-fixed resistors. Reference numerals 4a, 4b, 4c, and 4d are amplifiers for each reference power source made of dividing resistors, and use an operational amplifier as a voltage follower.
上記の構成によれば、各基準電圧の電圧値或いは液晶の
表示品質を監視しながら半固定抵抗を調整することによ
り、基準電圧の設定誤差をなくし、液晶の表示品質の向
上を図ることができる。According to the above configuration, by adjusting the semi-fixed resistor while monitoring the voltage value of each reference voltage or the display quality of the liquid crystal, it is possible to eliminate setting errors in the reference voltage and improve the display quality of the liquid crystal. .
なお、前記実施例では、抵抗調整手段として半固定抵抗
を利用したが、たとえば、分割抵抗を印刷抵抗で構成し
、抵抗調整手段としてレーザーを利用するなど、抵抗値
を調整できる手段があれば何でも良いことは言うまでも
ない。In the above embodiment, a semi-fixed resistor was used as the resistance adjustment means, but any means that can adjust the resistance value may be used, such as configuring the divided resistors with printed resistors and using a laser as the resistance adjustment means. Needless to say, it's a good thing.
（発明の効果）
以上説明したように、本発明によれば、極めて簡易な方
法で基準電圧を精度良く設定でき、液晶の表示品質の向
上を図ることができるので、実用的に極めて有用である
。(Effects of the Invention) As explained above, according to the present invention, the reference voltage can be set with high accuracy using an extremely simple method, and the display quality of the liquid crystal can be improved, so that it is extremely useful in practice. .
第１図は本発明の液晶駆動回路における液晶駆動電圧供
給用の電源回路の構成を示す一実施例図、第２図は従来
の液晶駆動回路の構成図である。
１．５ ・・・液晶駆動用電源、
２ａ、２ｂ、２ｃ、２ｄ、２ｅ、６ａ、６ｂ、６ｃ、６
ｄ、６ｅ−抵抗、３ａ、３ｂ、３ｃ、３ｄ、３ｅ−抵抗
調整手段、４ａ、４ｂ＋４ｃ、４ｄ、７ａ、７ｂ、７ｃ
、７ｄ ’−・増幅器第１図
第２図FIG. 1 is an embodiment diagram showing the configuration of a power supply circuit for supplying liquid crystal driving voltage in the liquid crystal driving circuit of the present invention, and FIG. 2 is a configuration diagram of a conventional liquid crystal driving circuit. 1.5...Liquid crystal driving power supply, 2a, 2b, 2c, 2d, 2e, 6a, 6b, 6c, 6
d, 6e-resistance, 3a, 3b, 3c, 3d, 3e-resistance adjustment means, 4a, 4b+4c, 4d, 7a, 7b, 7c
, 7d'--Amplifier Fig. 1 Fig. 2
Claims (1)
する複数個の抵抗とを有し、前記複数個の抵抗を調整す
るための抵抗調整手段を具備することを特徴とする液晶
駆動回路。1. A liquid crystal driving circuit comprising a liquid crystal driving power source and a plurality of resistors that divide the voltage of the liquid crystal driving power source, and further comprising a resistance adjustment means for adjusting the plurality of resistors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP216985A JPS61162028A (en) | 1985-01-11 | 1985-01-11 | Liquid crystal driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP216985A JPS61162028A (en) | 1985-01-11 | 1985-01-11 | Liquid crystal driving circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61162028A true JPS61162028A (en) | 1986-07-22 |
Family
ID=11521860
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP216985A Pending JPS61162028A (en) | 1985-01-11 | 1985-01-11 | Liquid crystal driving circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61162028A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61124020U (en) * | 1985-01-19 | 1986-08-05 | ||
| JPS6330518A (en) * | 1986-07-23 | 1988-02-09 | Showa Highpolymer Co Ltd | Curable resin and its production |
| US5212573A (en) * | 1988-11-18 | 1993-05-18 | Seiko Instruments Inc. | Input protection circuit of electro-optical device |
-
1985
- 1985-01-11 JP JP216985A patent/JPS61162028A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61124020U (en) * | 1985-01-19 | 1986-08-05 | ||
| JPS6330518A (en) * | 1986-07-23 | 1988-02-09 | Showa Highpolymer Co Ltd | Curable resin and its production |
| US5212573A (en) * | 1988-11-18 | 1993-05-18 | Seiko Instruments Inc. | Input protection circuit of electro-optical device |
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