Liquid crystal display device and method and apparatus for driving liquid crystal display device

Abstract

The invention provides a liquid crystal display (LCD) device and a method and apparatus for driving the LCD device, belonging to the liquid crystal display field. The method comprises the following steps: generating gray-scale data of sub-pixels according to the received image data; taking a plurality of sub-pixels as a processing unit, and generating polarity signals of gray-scale voltages corresponding to gray-scale data of each sub-pixel in the plurality of sub-pixels respectively, wherein the polarity signals of the gray-scale voltages are used for enabling the overall polarity of the gray-scale voltages of the plurality of the sub-pixels to approximate to zero; and outputting the gray-scale data of each sub-pixel and the corresponding polarity signals to a source driver of the LCD device. According to the LCD device and the method and apparatus for driving the LCD device provided by the invention, adverse effects of green adhesion, crosstalk, scintillation and the like caused by public voltage disturbance can be improved.

Description

technical field [0001] The invention relates to the field of liquid crystal display, in particular to a driving method of a liquid crystal display device, a driving device and a liquid crystal display device capable of improving defects such as green adhesion, crosstalk, and flicker caused by common voltage disturbances. Background technique [0002] Thin film transistor liquid crystal display (TFT-LCD) is a widely used display method at present. figure 1 It is the block diagram of the driving circuit of the existing thin film transistor liquid crystal display, such as figure 1 As shown, the driving circuit includes: a timing controller (TCON), a source driver (Source Driver), a gate driver (Gate Driver) and a grayscale voltage generator. The timing controller sends the grayscale data signal RGB, the polarity inversion signal POL, and the latch signal TP to the source driver, and sends the frame start signal STV, the clock signal CPV, and the output enable signal OE to the ...

AI Technical Summary

Problems solved by technology

The reasons for these phenomena are as follows: the liquid crystal display adopts a row scanning method. When the gate of a certain row is turned on, the pixel voltage of all sub-pixels is written into each sub-pixel through the data electrode, and there is a coupling capacitance between the data electrode and the Vcom electrode. , if the pixel voltage of a certain row is unbalanced, the capacitive coupling effect will be generated to pull the Vcom voltage, resulting in an error in the actual written voltage

like image 3 As shown, the dot inversion driving mode is adopted, but the gray scale voltage amplitudes of two adjacent pixels are different, causing the pixel voltage in the first row to be negative as a whole, pulling the Vcom voltage downward; while the pixel voltage in the second row is negative. The pixel voltage is generally positive, pulling the Vcom voltage up

Since Vcom is the reference common voltage, the deviation of Vcom causes an error in the voltage at both ends of the actual pixel

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