Title: Gamma correction circuit, liquid crystal driving circuit, display and power supply circuit
Application Number: 200410048260 Application Date: 2004.06.14
Publication Number: 1573425 Publication Date: 2005.02.02
Approval Pub. Date: 2007.01.10 Granted Pub. Date: 2007.01.10
International Classifi-cation: G02F1/01;G09G3/00;H04N5/00;H04N9/00
Applicant(s) Name: Seiko Epson Corp. Address:
Inventor(s) Name: Hara Taro
Attorney & Agent: yu gang
Abstract:
    Provided is a gamma correction circuit which can deal with various gamma characteristics and can supply stable gray scale voltages while suppressing power consumption. A gamma correction resistance 401 on an input side is connected in series between input voltages (VDDR and VSS). The gamma correction resistance near the input voltages (VDDR and VSS) is a variable resistance and others are fixed resistances. The gamma correction resistance 403 on an output side is connected in series between the input voltages (VDDR and VSS). The gamma correction resistance 403 near the input voltages (VDDR and VSS) is a variable resistance and others are fixed resistances. Even when the setting of the gray scale voltages is changed by changing the gamma correction resistance on the input side, the potentials on the input side and output side of an operational amplifier can be maintained always equal and an overcurrent between the gamma correction resistance and the operational amplifier does not flow by simultaneously changing the gamma correction resistances on the output side.
Time: 5