JPH0276782U - - Google Patents
Info
- Publication number
- JPH0276782U JPH0276782U JP15710188U JP15710188U JPH0276782U JP H0276782 U JPH0276782 U JP H0276782U JP 15710188 U JP15710188 U JP 15710188U JP 15710188 U JP15710188 U JP 15710188U JP H0276782 U JPH0276782 U JP H0276782U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- liquid crystal
- cpu
- resistor
- correction
- 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 claims 5
- 230000007704 transition Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 5
Description
第１図は本考案を実施した電卓等の電子機器に
おける電気回路の概略ブロツク図、第２図はその
駆動回路、駆動電圧調整回路並びに補正回路の具
体的回路図、第３図は電池駆動の小型電子機器の
概略電気ブロツク図であつて電源電圧降下を説明
する原理図である。
１……ＣＰＵ、３……駆動電圧調整回路、４…
…駆動回路、６……補正回路。
Figure 1 is a schematic block diagram of an electric circuit in an electronic device such as a calculator in which the present invention is implemented, Figure 2 is a specific circuit diagram of its drive circuit, drive voltage adjustment circuit, and correction circuit, and Figure 3 is a battery-driven circuit diagram. 1 is a schematic electrical block diagram of a small electronic device, and is a principle diagram illustrating power supply voltage drop. FIG. 1...CPU, 3...Drive voltage adjustment circuit, 4...
...Drive circuit, 6...Correction circuit.
Claims (1)
路を制御するＣＰＵを有する機器に備えられて上
記液晶表示素子への供給電圧を抵抗器よりなる駆
動電圧調整回路により調整し液晶の表示コントラ
ストを選択設定するものにおいて、 上記駆動電圧調整回路に直列に補正回路を付加
し、該補正回路は補正抵抗器及び該補正抵抗器と
並列に接続されたスイツチング手段よりなり、該
スイツチング手段をＣＰＵが出力するＨＡＬＴ信
号によりＣＰＵが動作モード状態のときはオンし
て上記補正抵抗器を短絡させ、待機モード状態の
ときはオフして上記補正抵抗器を短絡させないよ
うにし、ＣＰＵが動作モードに転移した時には強
制的に液晶への供給電圧を高めるようにしたこと
を特徴とする液晶表示コントラスト補正回路。[Claims for Utility Model Registration] A device having a drive circuit for driving a liquid crystal display element and a CPU for controlling the drive circuit is equipped with a drive voltage adjustment circuit comprising a resistor to adjust the voltage supplied to the liquid crystal display element. A correction circuit is added in series to the drive voltage adjustment circuit, and the correction circuit is comprised of a correction resistor and switching means connected in parallel with the correction resistor; When the CPU is in the operating mode, the switching means is turned on to short-circuit the compensation resistor, and when the CPU is in the standby mode, it is turned off to prevent the compensation resistor from being short-circuited, and the CPU A liquid crystal display contrast correction circuit characterized in that the voltage supplied to the liquid crystal is forcibly increased when the liquid crystal transitions to an operation mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15710188U JPH0276782U (en) | 1988-11-30 | 1988-11-30 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15710188U JPH0276782U (en) | 1988-11-30 | 1988-11-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0276782U true JPH0276782U (en) | 1990-06-12 |
Family
ID=31436249
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15710188U Pending JPH0276782U (en) | 1988-11-30 | 1988-11-30 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0276782U (en) |
-
1988
- 1988-11-30 JP JP15710188U patent/JPH0276782U/ja active Pending
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