Display panel and common voltage adjusting method thereof

Abstract

The invention provides a display panel and a common voltage adjusting method thereof, and the method can firstly judge whether a display picture is a bright spot judgment picture or a normal display picture, and then carries out the picture display through employing a smaller first common voltage when the bright spot judgment picture is displayed at a low gray scale, thereby preventing pixels which are dark spots from being displayed as bright spots by mistake, and improving the display quality. Therefore, dark spots can be accurately detected, and the bright spot reject ratio is reduced; when the image is normally displayed, the larger second common voltage is used for displaying the image, the pixel leakage current in the field blanking stage can be reduced, the image brightness under the low frequency can be improved, and therefore the image flickering problem during high and low frequency switching is solved. According to the invention, the first common voltage and the second common voltage which are different in size are set, the problem of picture flicker during high and low frequency switching can be improved by adopting the larger second common voltage when a picture is normally displayed, and meanwhile, the problem that the defect rate of bright spots is increased is avoided by adopting the smaller first common voltage when the picture is judged by the bright spots.

Description

technical field [0001] The present invention relates to the field of display technology, and in particular, to a display panel and a method for adjusting a common voltage thereof. Background technique [0002] For display panels with adaptive frame rate or frequency conversion function (freesync), the refresh rate of the screen can be adjusted according to the display content. The refresh rate is generally realized by adjusting the duration of vertical blanking (Vblank). The blanking period is long. When the frame rate is low, the vertical blanking period is short, which will cause more leakage of the pixel at low frame rate and lower the brightness of the pixel. Noticeable flickering is felt. [0003] At present, in view of the above problems, it is generally used to increase the array common voltage (Array VCOM) to reduce the leakage of pixels during the vertical blanking period, that is, for figure 1 The common 1T2C pixel circuit structure shown includes a switching tra...

AI Technical Summary

Problems solved by technology

However, increasing the common voltage of the array will cause the display panel to judge dark spots in a low-gray-scale picture, and the dark spots that were not bright spots will become bright spots due to the increase in the brightness of the dark spots, resulting in an increase in the defective rate of bright spots.

[0004] In view of this, it is necessary to propose a method for adjusting the common voltage of the display panel that is applicable to both the normal display scene and the bright spot judgment scene, so as to solve the problem of bright spots derived from improving the picture flickering phenomenon when the display panel switches between high and low frequencies quickly. The problem of increasing defective rate

Images