Gamma reference voltage generation circuit

Abstract

This invention discloses one Gamma reference voltage generation circuit for film transistor LCD, which comprises direct stable voltage, positive gamma reference voltage generation circuit and is characterized by the following: the said reference voltage generate circuit output end is connected with switch and reverse charge pump circuit to form negative Gamma reference generation circuit; according to LCD symmetric voltage to transparence property curve by simple circuit and positive Gamma reference voltage to Gamma reference voltage.

Description

technical field [0001] The invention relates to a thin film transistor liquid crystal display (TFT-LCD), in particular to a gamma (GAMMA) reference voltage generating circuit of the thin film transistor liquid crystal display. Background technique [0002] Liquid crystal display technology is developing very fast, and due to its light weight, liquid crystal display devices are widely used in various display fields. [0003] As an important part of the TFT-LCD module, the gamma reference voltage generation circuit plays a vital role in the gray scale adjustment of the TFT-LCD. The function of the gamma reference voltage generation circuit is to set the gamma reference voltages GMA1, GMA2, etc. according to the required gamma curve, as the reference voltage for the grayscale display of the thin film transistor liquid crystal display. For example, the gamma reference voltages in the positive pressure area are GMA1 to GMA5, the gamma reference voltages in the negative pressure ...

AI Technical Summary

Problems solved by technology

[0006] The main disadvantage of the prior art is that the determination of the gamma resistance value is very cumbersome, and different TFT liquid crystal display panels and different liquid crystal material characteristics need to be adjusted with different gamma resistance values, so a large amount of calculation and debugging work is required , greatly affecting the work efficiency of engineers and technicians

Moreover, each gamma reference voltage value should be input to the pins of the corresponding signal drive circuit, and often in order to improve the grayscale display characteristics, the number of gamma reference voltages will be increased, and the prior art needs to increase the corresponding number of signal drive circuits. Circuit input pins, so it is not conducive to the integration of signal drive circuits, which limits the display resolution

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