JPS6488494A - Bias current circuit - Google Patents

Bias current circuit

Info

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
Application number
JP24370587A
Other languages
Japanese (ja)
Other versions
JP2753232B2 (en
Inventor
Satoshi Takashimizu
Nobuaki Kabuto
Katsuhiro Masujima
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP62243705A priority Critical patent/JP2753232B2/en
Publication of JPS6488494A publication Critical patent/JPS6488494A/en
Priority to US07/567,703 priority patent/US5006739A/en
Application granted granted Critical
Publication of JP2753232B2 publication Critical patent/JP2753232B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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.
JP62243705A 1987-06-15 1987-09-30 Liquid crystal display Expired - Lifetime JP2753232B2 (en)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Patent Citations (1)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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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