LCD device and its display method

Abstract

A liquid crystal display device includes a liquid crystal display panel, a timing control circuit, a common voltage generating circuit, a gamma circuit and a scanning driving circuit. The liquid crystal display panel includes a plurality of thin film transistors. The scanning driving circuit is used to control the turn-on and turn-off of the thin film transistor. The timing control circuit is used to generate a common voltage timing signal and a grayscale voltage timing signal, and the two timing signals respectively control the common voltage generating circuit and the gamma circuit, so that the grayscale voltage generated by the gamma circuit when starting up Before being transmitted to the liquid crystal display panel, the common voltage generated by the common voltage generating circuit is transmitted to the liquid crystal display panel and stabilized, and makes the grayscale voltage and the common voltage drop to 0V at the same time when the power is turned off, and at this time the multiple The thin film transistors are all turned on.

Description

technical field [0001] The invention relates to a liquid crystal display device and a display method thereof. Background technique [0002] Liquid crystal display devices have the advantages of no radiation, thinness, and power saving, and gradually replace traditional CRT (Cathode Ray Tube, CRT) displays. At present, liquid crystal displays have been widely used in various high-quality digital televisions, notebook computers, digital cameras and other electronic products. [0003] see figure 1 , is a schematic circuit diagram of a pixel unit of a prior art liquid crystal display device. The pixel unit 1 includes a scanning line 5, a data line 6, a thin film transistor 2, a pixel electrode 31, a common electrode 32 and a liquid crystal layer (not shown) sandwiched between the two electrodes 31, 32 . The gate 22 of the TFT 2 is electrically connected to the scan line 5 , the source 21 is electrically connected to the data line 6 , and the drain 23 is electrically connecte...

AI Technical Summary

Problems solved by technology

Usually, when the liquid crystal display device is turned on to display images, the grayscale voltage Vd is generated before the common voltage Vcom, and when the grayscale voltage Vd is transmitted to the pixel electrode 31, the common voltage Vcom of the common electrode 32 still rises in a curve and does not reach a stable value. During the display period of the previous frames, the voltage difference between the common voltage Vcom and the pixel voltage Vd is different, so that the light transmittance of the liquid crystal capacitor 3 is different, so that the liquid crystal display device has a flicker phenomenon

[0006] In addition, the public voltage Vcom is gradually reduced to 0V at the moment of shutdown, and the charge inside the liquid crystal capacitor 3 cannot be quickly discharged, so that there is still a voltage difference between the two ends of the liquid crystal capacitor 3, that is, the electric field driving the deflection of the liquid crystal molecules still exists, and the liquid crystal molecules still have a certain Light transmittance, so the liquid crystal display device shows residual image under external light

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