JPS6488494A - Bias current circuit - Google Patents
Bias current circuitInfo
- Publication number
- JPS6488494A JPS6488494A JP24370587A JP24370587A JPS6488494A JP S6488494 A JPS6488494 A JP S6488494A JP 24370587 A JP24370587 A JP 24370587A JP 24370587 A JP24370587 A JP 24370587A JP S6488494 A JPS6488494 A JP S6488494A
- Authority
- JP
- Japan
- Prior art keywords
- mos
- current
- trs
- voltage
- prescribed
- 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.)
- Granted
Links
Abstract
PURPOSE: To obtain a high current switching ratio and a wide dynamic range by applying a prescribed voltage to each of gates of a plurality of MOS transistors TRs. CONSTITUTION: A plurality of MOS TRs 6 and 7 which are designed so as to be prescribed constant current sources respectively are connected in parallel and are used, and there is provided with a switching circuit 5 which switches the gate voltage of at least one MOS TR 6 to a voltage, which sets the MOS TR 6 to the cutoff state that no current is flowed, and a voltage required for flow of a prescribed current. In settling when a signal is written in a capacitive load like a liquid crystal cell, a plurality of MOS TRs are turned on to supply a large current; and thereafter, only a small number of MOS TRs are turned on to compensate an outflow current due to leakage. Thus, plural kinds of currents which have a large switching ratio and have small variances respectively are obtained, and the dynamic range is widened.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62243705A JP2753232B2 (en) | 1987-09-30 | 1987-09-30 | Liquid crystal display |
US07/567,703 US5006739A (en) | 1987-06-15 | 1990-08-15 | Capacitive load drive circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62243705A JP2753232B2 (en) | 1987-09-30 | 1987-09-30 | Liquid crystal display |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6488494A true JPS6488494A (en) | 1989-04-03 |
JP2753232B2 JP2753232B2 (en) | 1998-05-18 |
Family
ID=17107759
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62243705A Expired - Lifetime JP2753232B2 (en) | 1987-06-15 | 1987-09-30 | Liquid crystal display |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2753232B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6426744B2 (en) | 1997-09-12 | 2002-07-30 | Nec Corporation | Display driving apparatus having variable driving ability |
CN102098013A (en) * | 2009-12-10 | 2011-06-15 | 瑞萨电子株式会社 | Differential amplifier and control method for the same |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58172022A (en) * | 1982-03-29 | 1983-10-08 | インタ−ナシヨナル ビジネス マシ−ンズ コ−ポレ−シヨン | Drive circuit |
-
1987
- 1987-09-30 JP JP62243705A patent/JP2753232B2/en not_active Expired - Lifetime
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58172022A (en) * | 1982-03-29 | 1983-10-08 | インタ−ナシヨナル ビジネス マシ−ンズ コ−ポレ−シヨン | Drive circuit |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6426744B2 (en) | 1997-09-12 | 2002-07-30 | Nec Corporation | Display driving apparatus having variable driving ability |
CN102098013A (en) * | 2009-12-10 | 2011-06-15 | 瑞萨电子株式会社 | Differential amplifier and control method for the same |
JP2011124782A (en) * | 2009-12-10 | 2011-06-23 | Renesas Electronics Corp | Differential amplifier and method of controlling the same |
US9093964B2 (en) | 2009-12-10 | 2015-07-28 | Renesas Electronics Corporation | Differential amplifier and control method for the same |
Also Published As
Publication number | Publication date |
---|---|
JP2753232B2 (en) | 1998-05-18 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EXPY | Cancellation because of completion of term | ||
FPAY | Renewal fee payment |
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