Circuit and method for eliminating power-down residual image of IGZO display panel

A technology for display panels and afterimages, applied to static indicators, instruments, etc., can solve the problems of not considering the discharge speed of common electrodes, slow discharge, etc., and achieve the effect of eliminating afterimages after shutdown, accelerating discharge speed, and simple structure

Active Publication Date: 2018-12-07
NANJING PANDA ELECTRONICS MFG
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  • Abstract
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Problems solved by technology

However, because the discharge speed of the common

Method used

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  • Circuit and method for eliminating power-down residual image of IGZO display panel
  • Circuit and method for eliminating power-down residual image of IGZO display panel
  • Circuit and method for eliminating power-down residual image of IGZO display panel

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Embodiment Construction

[0031] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0032] The pixel structure of the liquid crystal panel is composed of the pixel electrode connected to the data signal line DL, the common electrode VCOM, the gate signal line SL of the switching transistor, the liquid crystal capacitor Clc and the storage capacitor Cs, such as figure 1 shown. Under the control of the grid signal, the liquid crystal molecules control the rotation angle of the liquid crystal molecules through the electric field formed on the liquid crystal capacitor by the pixel electrode and the common electrode respectivel...

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Abstract

The invention provides a circuit for eliminating a power-down residual image of an IGZO display panel. The circuit comprises a power supply module, a voltage comparison module, a voltage compensationstabilization module, a control module and a VCOM discharge module. A common electrode voltage VCOM is quickly pulled down to a GND when an IGZO display panel is powered down without adding an external circuit, so that the pixel electrode voltage is reduced, and the discharge speed of the pixel electrode and the common electrode at both ends of a liquid crystal capacitor is accelerated. The phenomenon of shutdown residual images can be effectively eliminated; and the voltage compensation stabilization module can effectively avoid the display abnormality of the IGZO panel due to voltage instability and control the stability of VCOM charge rapid release in the power-down state.

Description

technical field [0001] The invention belongs to the technical field of liquid crystal display, in particular to a circuit and a method for eliminating afterimage after power failure of an IGZO display panel. 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 in which switching transistors are formed in each pixel distributed in a matrix in a liquid crystal panel is now widely used. 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 pixe...

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Application Information

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IPC IPC(8): G09G3/36
CPCG09G3/36G09G2320/0257
Inventor 文博沈佳洁齐学敏杜柏霖龚雨菲
Owner NANJING PANDA ELECTRONICS MFG
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