Common electrode discharge circuit, source drive circuit and common electrode discharge method
A common electrode and discharge circuit technology, applied in the field of common electrode discharge circuits, can solve the problems of screen flicker and slow discharge, and achieve the effect of improving the screen flicker phenomenon
Active Publication Date: 2021-07-23
TCL CHINA STAR OPTOELECTRONICS TECH CO LTD
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Problems solved by technology
The common electrode discharges slowly because there is no special discharge circuit.
A certain clamping pressure is formed between the pixel electrode and the common electrode, causing the liquid crystal to be in a distorted state for a certain period of time after the power is turned off. If the backlight is turned on or the outside light shines on the surface of the liquid crystal cell (cell), the screen flicker phenomenon will be visible.
Method used
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[0024] see figure 1 , which is a schematic circuit diagram of a preferred embodiment of the common electrode discharge circuit of the present invention. The common electrode discharge circuit mainly includes: a comparator and an NPN transistor T6; the inverting input of the comparator is connected to the power supply voltage VDD of the source drive circuit, and the non-inverting input of the comparator is connected to the preset power supply after the power is turned off. The threshold voltage V1 of the power supply voltage VDD when the pixel electrode starts to discharge, the output terminal of the comparator is connected to the base B of the transistor T6, the collector C of the transistor T6 is connected to the common electrode, and the emitter E of the transistor T6 is connected to the data signal line. Those skilled in the art can understand that in other embodiments, the transistor T6 can also be replaced by other types of switch transistors.
[0025] based on figure 1...
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The invention relates to a common electrode discharge circuit, a source drive circuit and a common electrode discharge method. The common electrode discharge circuit includes: a comparator and a switch tube; the inverting input terminal of the comparator is connected to the power supply voltage (VDD) of the source drive circuit, and the non-inverting input terminal of the comparator is connected to the pixel after the preset power is turned off. The threshold voltage (V1) of the power supply voltage (VDD) when the electrodes start to discharge, the output end of the comparator is connected to the control end of the switch tube, the first end of the switch tube is connected to the common electrode, and the first end of the switch tube is connected to the common electrode. The two ends are connected with the data signal line. The invention also provides a corresponding source drive circuit and a common electrode discharge method. The present invention specially designs a common electrode discharge circuit, which can be integrated in the source drive circuit. When the power is turned off, the common electrode and the pixel electrode are discharged at the same time, which can improve the screen flicker phenomenon caused by the inconsistency of the discharge speed between the pixel electrode and the common electrode. .
Description
technical field [0001] The invention relates to the field of display technology, in particular to a common electrode discharge circuit, a source drive circuit and a common electrode discharge method. Background technique [0002] In recent years, liquid crystal display devices (Liquid Crystal Display, LCD) have been widely used in many fields, and continue to present a rapid growth trend. With the improvement of drive technology, it has the advantages of low power consumption, thin and light weight, low voltage drive, etc., and has been widely used in video recorders, notebook computers, desktop display devices and various projection equipment. [0003] A liquid crystal display device generally has a gate driving circuit, a source driving circuit and a pixel array. There are multiple pixel circuits in the pixel array, and each pixel circuit is turned on and off according to the scan signal provided by the gate drive circuit, and displays a data picture according to the data...
Claims
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IPC IPC(8): G09G3/36
Inventor 黄顾
Owner TCL CHINA STAR OPTOELECTRONICS TECH CO LTD