JPH0245522U - - Google Patents
Info
- Publication number
- JPH0245522U JPH0245522U JP12245488U JP12245488U JPH0245522U JP H0245522 U JPH0245522 U JP H0245522U JP 12245488 U JP12245488 U JP 12245488U JP 12245488 U JP12245488 U JP 12245488U JP H0245522 U JPH0245522 U JP H0245522U
- Authority
- JP
- Japan
- Prior art keywords
- drive voltage
- liquid crystal
- circuit
- segment
- resistors
- 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 description 12
- 239000004065 semiconductor Substances 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 1
Landscapes
- Semiconductor Integrated Circuits (AREA)
- Liquid Crystal (AREA)
- Liquid Crystal Display Device Control (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Description
第１図は本考案の液晶駆動電圧発生回路を示す
回路図、第２図は本考案の液晶駆動電圧発生回路
を内蔵した半導体集積回路内におけるコモン駆動
回路及びセグメント駆動回路を示すブロツク図、
第３図は第１図及び第２図によつて作成された、
各液晶駆動方式に対応するコモン駆動電圧及びセ
グメント駆動電圧の波形を示す波形図である。
１，２，３，４，５…抵抗、６，７，８…トラ
ンスフアゲート、９…スイツチ制御回路、１０―
１，１０―２……１０―ｎ…コモン駆動回路、１
２―１，１２―２……１２―ｍ…セグメント駆動
回路。
FIG. 1 is a circuit diagram showing a liquid crystal drive voltage generation circuit of the present invention, and FIG. 2 is a block diagram showing a common drive circuit and a segment drive circuit in a semiconductor integrated circuit incorporating the liquid crystal drive voltage generation circuit of the present invention.
Figure 3 was created based on Figures 1 and 2.
FIG. 3 is a waveform diagram showing waveforms of a common drive voltage and a segment drive voltage corresponding to each liquid crystal drive method. 1, 2, 3, 4, 5...Resistor, 6, 7, 8...Transfer gate, 9...Switch control circuit, 10-
1, 10-2...10-n...Common drive circuit, 1
2-1, 12-2...12-m...Segment drive circuit.
Claims (1)
各接続点に得られる液晶駆動電圧によつて、液晶
表示装置のコモン電極及びセグメント電極に夫々
印加されるコモン駆動電圧及びセグメント駆動電
圧を作成させる複数の抵抗と、 該複数の抵抗中における所定の抵抗を短絡して
前記コモン駆動電圧及び前記セグメント駆動電圧
の電圧レベルを制御すべく、前記所定の抵抗と並
列接続されるスイツチ回路と、 該スイツチ回路のオン／オフを制御するスイツ
チ制御回路と、 を備えたことを特徴とする液晶駆動電圧発生回
路。 (2) 第１電源及び第２電源間に直列接続され、
各接続点に得られる液晶駆動電圧によつて、液晶
表示装置のコモン電極及びセグメント電極に夫々
印加されるコモン駆動電圧及びセグメント駆動電
圧を作成させる複数の抵抗と、 該複数の抵抗中における所定の抵抗を短絡して
前記コモン駆動電圧及び前記セグメント駆動電圧
の電圧レベルを制御すべく、前記所定の抵抗と並
列接続されるスイツチ回路と、 該スイツチ回路のオン／オフを制御するスイツ
チ制御回路と、 前記複数の抵抗の所定の接続点に得られる液晶
駆動電圧が印加され、液晶駆動方式の異なるコモ
ン駆動電圧を発生するコモン駆動回路と、 前記複数の抵抗の所定の接続点に得られる液晶
駆動電圧が印加され、液晶駆動方式の異なるセグ
メント駆動電圧を発生するセグメント駆動回路と
、 を備えたことを特徴とする半導体集積回路。[Claims for utility model registration] (1) Connected in series between the first power source and the second power source,
A plurality of resistors that create a common drive voltage and a segment drive voltage that are respectively applied to the common electrode and segment electrode of the liquid crystal display device according to the liquid crystal drive voltage obtained at each connection point; a switch circuit connected in parallel with the predetermined resistor in order to short-circuit the resistors and control the voltage levels of the common drive voltage and the segment drive voltage; a switch control circuit that controls on/off of the switch circuit; A liquid crystal drive voltage generation circuit characterized by comprising: (2) connected in series between the first power source and the second power source,
A plurality of resistors that create a common drive voltage and a segment drive voltage that are respectively applied to the common electrode and segment electrode of the liquid crystal display device according to the liquid crystal drive voltage obtained at each connection point; a switch circuit connected in parallel with the predetermined resistor in order to short-circuit the resistors and control the voltage levels of the common drive voltage and the segment drive voltage; a switch control circuit that controls on/off of the switch circuit; a common drive circuit that generates common drive voltages for different liquid crystal drive systems by applying a liquid crystal drive voltage obtained at a predetermined connection point of the plurality of resistors; and a liquid crystal drive voltage obtained at a predetermined connection point of the plurality of resistors. A semiconductor integrated circuit comprising: a segment drive circuit that generates segment drive voltages for different liquid crystal drive systems upon application of segment drive voltages;
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12245488U JPH0245522U (en) | 1988-09-19 | 1988-09-19 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12245488U JPH0245522U (en) | 1988-09-19 | 1988-09-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0245522U true JPH0245522U (en) | 1990-03-28 |
Family
ID=31370403
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12245488U Pending JPH0245522U (en) | 1988-09-19 | 1988-09-19 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0245522U (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57104185A (en) * | 1980-12-20 | 1982-06-29 | Tokyo Shibaura Electric Co | Power source division circuit |
-
1988
- 1988-09-19 JP JP12245488U patent/JPH0245522U/ja active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57104185A (en) * | 1980-12-20 | 1982-06-29 | Tokyo Shibaura Electric Co | Power source division circuit |
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