Control circuit for eliminating glittering and shutdown ghosting phenomena of thin film field effect transistor

Abstract

The invention discloses a control circuit for eliminating glittering and shutdown ghosting phenomena of a thin film field effect transistor. The problems of glittering and shutdown ghosting in the working process of a conventional TFT-LCD (thin film transistor-liquid crystal display) panel are mainly solved. The control circuit comprises a comparing module, an input control module and an output control module; the comparing module generates four output signals through the input control module; a first output signal is connected to an LCD data driving module; a second output signal and a thirdoutput signal are connected to the output control module; and a fourth output signal is connected to an LCD door driving module through the output control module. The descending slope of an output voltage can be adjusted by controlling the strength of the discharging current of a capacitor in the output control module; the common-mode error in the working process of a TFT-LCD is compensated; the glittering phenomenon is eliminated; electric charges in the TFT-LCD are released by controlling the shutoff sequence of the LCD data driving module and the LCD door driving module; and the shutdown ghosting is eliminated. By using the control circuit, the image display quality of the TFT-LCD is effectively improved, and the control circuit can be used for TFT-LCD display equipment.

Description

technical field [0001] The invention belongs to the technical field of electronic circuits, and relates to an analog integrated circuit, in particular to a control circuit for eliminating the flickering phenomenon of a thin film field effect transistor liquid crystal display and the afterimage phenomenon after shutdown. Background technique [0002] Thin Film Field Effect Transistor Liquid Crystal Display TFT-LCD is one of the active matrix type liquid crystal display AM-LCD. Because of its advantages such as high color saturation, strong color reproduction ability, good picture quality and fast response speed, TFT-LCD has quickly become the mainstream product in the new century. With the rapid development of liquid crystal display technology, more and more attention has been paid to the research on liquid crystal. Among them, because the gamma correction technology can greatly improve the picture quality of TFT-LCD display equipment, it has become the mainstream of liquid ...

AI Technical Summary

Problems solved by technology

figure 2 The waveform diagram of the input signal EN, CTR and output signal OUT of the traditional TFT-LCD control circuit is given. It can be seen that the output control signal OUT is a complete square wave. The square wave signal drives the TFT-LCD through the gate drive circuit. A common mode error is generated, which causes the flicker phenomenon of TFT-LCD; at the same time, because the traditional circuit does not do any technical processing to eliminate the residual image after shutdown, the residual image after shutdown is inevitable, resulting in the degradation of the image display quality of TFT-LCD

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