Grid pulse modulation circuit and shading modulation method thereof

Abstract

The invention relates to a grid pulse modulation circuit and a shading modulation method thereof. The grid pulse modulation circuit is provided with an output end, a voltage modulation circuit and a comparison control circuit, wherein the voltage modulation circuit is coupled between a grid power supply voltage and a second preset voltage and receives control of a shading control signal so as to shade and make the output end output a voltage signal for shading; the comparison control circuit comprises a comparator and a switch component; and the first input end of the comparator is coupled to a node of the voltage modulation circuit, while the second input end is coupled to a first preset voltage. When the voltage modulation circuit performs shading operation, the relative magnitude relation between the voltage at the node point and the first preset voltage decides the switching on and switching off states of the switch component so as to decide the occasion that the first preset voltage is transmitted to the output end.

Description

technical field [0001] The present invention relates to the field of display technology, and in particular to a gate pulse modulation circuit and an angle-cutting modulation method thereof. Background technique [0002] The driving method of the thin film transistor liquid crystal display (TFT-LCD) is to use the gate pulse signal to drive each pixel transistor to control the on and off state of each pixel; when a gate pulse signal is input to make the pixel transistor turn on, The data signal to be displayed will be transmitted to the pixel through the pixel transistor. If the pixel transistor is cut off, the data signal to be displayed will not be transmitted to the pixel through the pixel transistor. [0003] In the pixel array of the display panel, each pixel can be composed of equivalent resistance and equivalent capacitance. In this case, each gate pulse signal scan will cause the input waveform at the front end of the scan line to be different from that at the rear end...

AI Technical Summary

Problems solved by technology

In the prior art, it utilizes the characteristics of forward conduction and reverse non-conduction of diode D0 to select an opportunity to transmit the power supply voltage AVDD to the output terminal 51 of the gate pulse modulation circuit 50, so as to control the lower limit of the chamfered voltage signal VGHM (corresponding to figure 2 The part enclosed by the dotted circle), however from figure 2 It can be found that the lower limit of the chamfered voltage signal VGHM is not a fixed value. One of the main reasons for the analysis is that the lower limit is affected by the conduction characteristics of the diode D0 itself. As a result, the flickering phenomenon of the screen has not been completely solved. improve

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