Patent ID: 7639222

Claim:
An image correction circuit of a fiat panel display, comprising: a digital to analog conversion unit, comprising: a gamma voltage generator having a resistance stream and a plurality of selectors coupled to the resistance stream for generating a plurality of gamma voltages according to a digital data; and a temperature sensor electrically connected to the gamma voltage generator for sensing a working temperature of the resistance stream of the gamma voltage generator; and a data processing unit electrically connected to the digital to analog conversion unit, and the data processing unit outputs the digital data, comprising a plurality of first control codes and a plurality of second control codes, to the digital to analog conversion unit according to the working temperature sensed by the temperature sensor, and the data processing unit comprising: a dynamic gamma correction unit for receiving an image data and analyzing a gray scale distribution of the image data so as to generate a gamma characteristic curve, wherein the gamma voltages are corresponding to the gamma characteristic curve; a first register, wherein the first control codes are stored in the first register, and each of the first control codes is corresponding to one of the gamma voltages; a second register, wherein the second control codes are stored in the second register, and each of the second control codes is corresponding to one of the gamma voltages and mapping to one of the first control codes, wherein the digital to analog conversion unit is selectively electrically connected to the first register or the second register to receive the first control code or the second control code according to the working temperature sensed by the temperature sensor, and one of the gamma voltages is output according to the first control code or the second control code received; and a switch controller, electrically connected between the digital to analog conversion unit and the first and second registers, in selection for electrically connecting the digital to analog conversion unit with the first register or electrically connecting the digital to analog conversion unit with the second register.