JPS6283725A - Liquid crystal displaying device - Google Patents
Liquid crystal displaying deviceInfo
- Publication number
- JPS6283725A JPS6283725A JP22352985A JP22352985A JPS6283725A JP S6283725 A JPS6283725 A JP S6283725A JP 22352985 A JP22352985 A JP 22352985A JP 22352985 A JP22352985 A JP 22352985A JP S6283725 A JPS6283725 A JP S6283725A
- Authority
- JP
- Japan
- Prior art keywords
- resistance
- voltage
- liquid crystal
- time division
- displaying
- 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
Landscapes
- Liquid Crystal Display Device Control (AREA)
- Liquid Crystal (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は液晶表示装置に係り、特に表示時分割数を変え
る場合に好適な液晶表示素子駆動回路に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a liquid crystal display device, and particularly to a liquid crystal display element drive circuit suitable for changing the number of display time divisions.
従来の液晶表示装置のコントラスト調整は、人がボリュ
ームを動かすことで行っていたので（実公昭５８−１５
９５９号公報）、時分割数を変えた場合、ボリュームの
調整をし直さなければならないし、またバイアス値が固
定されていたため最適バイアス値から大きく離れてしま
うという欠点があった。Contrast adjustment of conventional liquid crystal display devices was done by a person moving the volume (Jikko Kouko 58-15).
No. 959), when the number of time divisions is changed, the volume must be readjusted, and since the bias value is fixed, it has the disadvantage that it deviates greatly from the optimum bias value.
本発明の目的は、時分割数を変えたとき、同時にバイア
ス値およびあるいは電圧供給回路の電圧を変え、時分割
数が変わってもコントラスト良く表示が見えるようにす
ることにある。An object of the present invention is to simultaneously change the bias value and/or the voltage of the voltage supply circuit when changing the number of time divisions, so that the display can be seen with good contrast even if the number of time divisions changes.
電圧平均化法（日経エレクトロニクス１９ｇ０．８゜１
８号第１６２〜１６６頁）により液晶表示素子を駆動す
る場合の液晶表示装置の概要を第１図に示す。図中、１
は液晶表示素子、２は表示電極駆動ＩＣｌ３は走査電極
部ＩＪＩＩＩｃ、４は電圧供給回路、５はコントロール
回路である。駆動ＩＣは、ある一定の電位レベルが必要
である。この電位レベルを供給するのが、電圧供給回路
である。電圧供給回路は普通第２図のような抵抗分割回
路で構成される。Voltage averaging method (Nikkei Electronics 19g0.8゜1
8, pp. 162-166), an outline of a liquid crystal display device in which a liquid crystal display element is driven is shown in FIG. In the figure, 1
2 is a liquid crystal display element, 2 is a display electrode drive ICl3 is a scanning electrode portion IJIIIc, 4 is a voltage supply circuit, and 5 is a control circuit. The drive IC requires a certain potential level. A voltage supply circuit supplies this potential level. The voltage supply circuit usually consists of a resistor divider circuit as shown in FIG.
ｖ６Ｄ端子＋ ＶＥ６’端子に電位が印加される。６は
抵抗値Ｒの抵抗であり、７は抵抗値（ａ−４）Ｒの抵抗
である（バイアス値１／ａ）。時分割数Ｎの場合、液晶
表示素子のあるドツトに印加される点灯時の電圧Ｖｏｎ
は式（１）のとおりである。A potential is applied to the v6D terminal + VE6' terminal. 6 is a resistor with a resistance value R, and 7 is a resistor with a resistance value (a-4)R (bias value 1/a). When the number of time divisions is N, the voltage applied to a certain dot of the liquid crystal display element during lighting Von
is as shown in equation (1).
ｖｏｎ＝ｖｏ４アＮ／ａ （１）ここで
Ｖ ｏ ” ＶＤ′ＯＶ≦６である。時分割数をＮ１→
Ｎ２に又はバイアス値を１／ａ１→１／ａ２に変えても
点灯時開加電圧Ｖａｎを同じにするためには１次の（２
）式を満足しなければならない。von=vo4AN/a (1) Here, V o ” VD'OV≦6.The number of time divisions is N1→
Even if the bias value is changed to N2 or the bias value is changed from 1/a1 to 1/a2, the first-order (2
) formula must be satisfied.
ｖｏＪｚ■７ｍ０／ａ ｔ ：ｖｏ５−訂巧バゴ／ａｔ
（２）バイアスを変えない場合はＶｏ、は（３）
式のとおりとなる（ ａ ｚ ” ａ ｚ ” ａ ）
ｓＶｏ、＝Ｖｏ、Ｎ、（ａ”＋Ｎ１−］）／（Ｎｘ（
ａ”＋Ｎ、−１）） （３）また常に最適バイアスを
選択する場合は、最適バイアスが（４）式となることか
ら、（５）式のようになる。voJz■7m0/at: vo5-Sekiko Bago/at
(2) If the bias is not changed, Vo is (3)
The formula is as follows ( a z ” a z ” a )
sVo, = Vo, N, (a”+N1-])/(Nx(
a''+N, -1)) (3) Furthermore, when the optimal bias is always selected, the optimal bias is expressed by equation (4), so equation (5) is obtained.
ａｂ２５＋＝ Ｉ汀＋１（４）
ＶＯ２＝ＶＯ，Ｎ２” ｚ）／（Ｎｔ” 、）
（５）一般的にはｖ、６′の方を可変にして
、（３）式や（５）式のような電圧が印加されるように
する。実際には正確に（１）式のような電圧が印加され
ることはないので、人が表示を見て適当と思われる電圧
を設定する。ab25+=I+1(4) VO2=VO,N2"z)/(Nt",)
(5) Generally, v and 6' are made variable so that the voltages expressed by equations (3) and (5) are applied. In reality, a voltage exactly as shown in equation (1) is not applied, so a person looks at the display and sets a voltage that seems appropriate.
本発明の一実施例を第３図により説明する。第２図と同
じものは同符号を用いている。６は抵抗値Ｒの抵抗であ
り、８は抵抗値Ｒ１の抵抗〔バイアス値： Ｒ／（４Ｒ
＋Ｒ１））であり、９は抵抗値Ｒ２の抵抗〔バイアス値
： Ｒ／（４Ｒ＋Ｒ，））である、１０は時分割数が切
り替わると同時に切り替わるようにした連動切り替えス
イッチである。ＶＥ’ｌ 、’ ｒ■６１′に印加され
る電位あるいはその比、その差等はあらかじめ表示がど
ちらの時分割数でも良く見えるよう設定しておく必要が
ある０本実施例によれば、バイアス値およびｖＥ！／の
電位を時分割数の切り替えとともに変えることが可能と
なるという効果がある。An embodiment of the present invention will be described with reference to FIG. Components that are the same as in FIG. 2 are designated by the same reference numerals. 6 is a resistor with a resistance value R, and 8 is a resistor with a resistance value R1 [bias value: R/(4R
+R1)), 9 is a resistor with a resistance value R2 [bias value: R/(4R+R,)), and 10 is an interlocking changeover switch that is switched at the same time as the number of time divisions is switched. The potentials applied to VE'l and 'r61', their ratios, and their differences must be set in advance so that the display can be clearly seen in either time division number.According to this embodiment, the bias Value and vE! This has the effect that the potential of / can be changed at the same time as the number of time divisions is changed.
本発明によれば、時分割数とともにバイアス値および電
圧供給回路の電圧を変えることができるので、常に表示
がコントラスト良く見えるという効果がある。According to the present invention, since the bias value and the voltage of the voltage supply circuit can be changed together with the number of time divisions, there is an effect that the display always looks good in contrast.
第１図は液晶表示装置の概要図、第２図はそれにおける
従来の電圧供給回路の分圧抵抗布回路図。
第３図は本発明の一実施例による電圧供給回路の分圧抵
抗布回路図である。
１・・・液晶表示素子、２・・・表示電極駆動ＩＣｌ３
・・・走査電極駆動ＩＣ，４・・・電圧供給回路、５°
・・コントロール回路、６・・・抵抗（抵抗値Ｒ）、７
・・・抵抗（抵抗値（ａ−４） Ｒ）、８・・・抵抗（
抵抗値Ｒ，）、９・・・抵抗（抵抗値第 １ 図
ＶｔＥｚ Ｖｔｔ＋FIG. 1 is a schematic diagram of a liquid crystal display device, and FIG. 2 is a voltage dividing resistor cloth circuit diagram of a conventional voltage supply circuit therein. FIG. 3 is a voltage dividing resistor cloth circuit diagram of a voltage supply circuit according to an embodiment of the present invention. 1...Liquid crystal display element, 2...Display electrode drive ICl3
...Scanning electrode drive IC, 4...Voltage supply circuit, 5°
...Control circuit, 6...Resistance (resistance value R), 7
...Resistance (resistance value (a-4) R), 8...Resistance (
Resistance value R,), 9...Resistance (Resistance value 1st figure VtEz Vtt+
Claims (1)
ＩＣと、このＩＣに電圧を供給する回路および駆動ＩＣ
をコントロールする回路よりなる液晶表示装置において
、表示時分割数を切り換えると同時にバイアスおよびあ
るいは電圧供給回路の電圧を変える回路を設けたことを
特徴とする液晶表示装置。1. A liquid crystal display element, an IC that drives it using the voltage averaging method, a circuit that supplies voltage to this IC, and a drive IC
What is claimed is: 1. A liquid crystal display device comprising a circuit for controlling a display time division number and at the same time changing a bias and/or a voltage of a voltage supply circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22352985A JPS6283725A (en) | 1985-10-09 | 1985-10-09 | Liquid crystal displaying device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22352985A JPS6283725A (en) | 1985-10-09 | 1985-10-09 | Liquid crystal displaying device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6283725A true JPS6283725A (en) | 1987-04-17 |
Family
ID=16799576
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22352985A Pending JPS6283725A (en) | 1985-10-09 | 1985-10-09 | Liquid crystal displaying device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6283725A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5301047A (en) * | 1989-05-17 | 1994-04-05 | Hitachi, Ltd. | Liquid crystal display |
-
1985
- 1985-10-09 JP JP22352985A patent/JPS6283725A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5301047A (en) * | 1989-05-17 | 1994-04-05 | Hitachi, Ltd. | Liquid crystal display |
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