Gamma voltage generating circuit

Abstract

The gamma voltage generating circuit includes an amplifier and a resistor string composed of a plurality of resistors connected in series. The amplifier is used to provide a reference voltage. The resistor string includes a first part, a second part and a third part. One end of the first part is coupled to a reference voltage, and one end of the third part is coupled to a voltage smaller than the reference voltage. The resistor string is used to divide the reference voltage to form multiple gamma voltages. There is a first voltage difference between two adjacent gamma voltages divided by the first part and the third part of the resistor string. There is a second voltage difference between two adjacent gamma voltages divided by the second part of the resistor string. The second voltage difference is smaller than the first voltage difference.

Description

technical field [0001] The invention relates to a gamma voltage generating circuit, in particular to a gamma voltage generating circuit capable of generating non-linear gamma voltage. Background technique [0002] The function of the gamma voltage generation circuit is to set the gamma reference voltage according to the gamma curve required by the liquid crystal display, as a reference voltage for the grayscale display of the thin film transistor liquid crystal display. Each gamma reference voltage is input into the source driver of the thin film transistor liquid crystal display, and all gray scale voltages are generated through the digital-to-analog converter in the source driver. [0003] Generally speaking, in the display system, the human eye is most sensitive to the voltage value of the middle gray scale. Therefore, when the gray scale voltage here changes slightly, the human eye can feel the difference. However, the modulation method of the traditional gray scale volt...

AI Technical Summary

Problems solved by technology

[0003] Generally speaking, in the display system, the human eye is most sensitive to the voltage value of the middle gray scale. Therefore, when the gray scale voltage here changes slightly, the human eye can feel the difference. However, the modulation method of the traditional gray scale voltage , all use a linear method to form the required gamma reference voltage, without considering the sensitivity of the human eye, resulting in the inability to show the best image quality

In addition, in order to solve the problem of flickering quality deterioration of the display system caused by clock feedthrough, a non-linear method must also be used to form the required gamma reference voltage

[0004] Therefore, there is an urgent need for a gamma voltage generation circuit that can dynamically adjust the gamma reference voltage according to the sensitivity of the human eye, and at the same time solve the problem of poor picture quality caused by clock feed-in

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