Gamma correction method and device of display panel

Abstract

The invention provides a gamma correction method and device of a display panel, and the method and device receive an image signal of a front end, detect the refresh frequency of the image signal in real time, and then call different gamma correction curves according to whether the refresh frequency of the image signal exceeds a preset refresh frequency or not, calls the gamma correction curve with higher brightness at the low refresh frequency, so that the gamma correction curve with higher brightness can be used for compensating certain brightness when the electric leakage is higher and the display brightness is reduced at the low refresh frequency of the display panel. Because the number of the target gray scales of each gamma correction curve is small, the number of data voltages corresponding to each group of target gray scales is small, so that when the display panel is switched from a high refresh frequency to a low refresh frequency, the display brightness of the display panel can be quickly adjusted, the display brightness of the display panel can be kept unchanged, the flicker phenomenon is avoided, and the storage space of the register is saved.

Description

technical field [0001] The present application relates to the field of display technology, and in particular to a gamma correction method and device for a display panel. Background technique [0002] Variable refresh rate VRR is an important function of the display panel. The VRR mode can make the display panel freely switch between high refresh rate and low refresh rate without causing screen tearing. However, some display panels switch from high refresh rate through VRR mode. When the refresh rate is low, the figure 1 A schematic diagram of the charging time and field blanking time included in each frame of image in the prior art, such as figure 1 As shown, when the charging time of each frame of image is the same, the field blanking time (also called blank time or blank time) of the high refresh rate is longer than that of the low refresh rate, that is, the time for the picture to be maintained at the low refresh rate is prolonged, which means This will increase the lea...

AI Technical Summary

Problems solved by technology

However, there are two problems in the method of using the white balance tracking table. On the one hand, the white balance tracking table includes the RGB grayscale parameters of each frequency. For example, an 8bit display panel needs to set 256*3=768 grayscales at each frequency. Level parameters, a 10bit display panel needs to set 1024*3=3072 grayscale parameters at each frequency, so the white balance tracking parameter table requires a large storage space, and on the other hand, it is necessary to call the frequency corresponding to each frequency Therefore, there is a certain delay in the current adjustment method when switching from a high refresh rate to a low refresh rate. If the frequency is switched quickly, the human eye may still feel flickering on the display panel.

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