Flicker debugging method and device for a liquid crystal display panel

Abstract

Disclosed are a flicker debugging method and apparatus for a liquid crystal display panel. The liquid crystal display panel comprises a plurality of pixel electrodes and at least one common electrode. The flicker debugging method comprises: applying a first common voltage to the common electrode, and acquiring a specific grayscale voltage, complying with a gamma curve, of a specific grayscale and acquiring at least one sampling grayscale voltage, complying with the gamma curve, of at least one sampling grayscale; applying the specific grayscale voltage to the pixel electrodes, adjusting the common voltage applied to the common electrode, and obtaining, by means of detecting a flicker value of a display image of the liquid crystal display panel, a common voltage when the flicker value is minimum and taking same as a second common voltage; and applying the second common voltage to the common electrode, adjusting the at least one sampling grayscale voltage, and obtaining, by means of detecting the flicker value of the display image of the liquid crystal display panel, a grayscale voltage when the flicker value is minimum and taking same as a gamma reference voltage of a corresponding sampling grayscale. In such a way, the probability of a disadvantageous flicker occurring in a display image when displayed in full grayscale can be reduced.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a method and device for debugging the flicker of a liquid crystal display panel. Background technique [0002] In a Liquid Crystal Display (LCD for short), the pixel voltage Vn applied to the pixel electrode varies up and down with the common voltage Vcom applied to the common electrode, as shown in figure 1 As shown, the pixel voltages V0-V255 correspond to gray scale 0 to gray scale 255, wherein, when the pixel voltage is greater than the common voltage Vcom, the pixel is positive; when the pixel voltage is lower than the common voltage Vcom, the pixel is negative. For the pixel voltage corresponding to each gray scale, the two frames before and after are greater than the common voltage Vcom and greater than the common voltage Vcom, and the absolute value of the difference between the signal voltage of the two frames before and after and the common voltage Vcom is the same, so...

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Problems solved by technology

[0003] However, due to differences in LCD manufacturing processes and the influence of impurity ions in the liquid crystal cell, the above-mentioned common voltage Vcom has a certain offset in the actual display, that is, there is an offset voltage between the actual common voltage and the theoretical common voltage △V, when the liquid crystal panel is used for display, especially for some special industries (instrument panel, long-time display instrument, map, etc.), it will seriously affect the normal flip of the liquid crystal molecules in the liquid crystal cell, which will easily lead to the When a gray-scale voltage (including positive gray-scale voltage and negative polarity gray-scale voltage) is applied to the display panel, the brightness of the display screen corresponding to the positive polarity gray-scale voltage and the negative polarity gray-scale voltage will be different, and the display screen will flicker, which will cause afterimage phenomenon

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