Gray scale correction method and system of display panel

Abstract

The invention discloses a gray scale correction method and system of a display panel, and the gray scale correction method comprises the steps: storing a gamma voltage value corresponding to a node correction gray scale in a gamma register in the display panel, and obtaining an actual measurement brightness gray scale curve of a correction region of the display panel; obtaining a detection brightness value corresponding to the correction area at the maximum input gray scale according to the actually measured brightness gray scale curve; judging whether the detection brightness value corresponding to the maximum input gray scale is smaller than a standard brightness value or not; if yes, obtaining a gray scale correction table according to the actually-measured brightness gray scale curve and the standard brightness gray scale curve of the correction area and writting into a storage medium connected with the driving chip of the display panel, wherein the gray scale correction table records the correction amount corresponding to the input gray scale of each node.

Description

technical field [0001] The present invention relates to a technology in the field of OLED panels, and more specifically, relates to a method and system for gray scale correction of a display panel. Background technique [0002] An organic light emitting display device (OLED) is an active light emitting device. Compared with the current mainstream flat-panel display technology Thin Film Transistor Liquid Crystal Display (TFT-LCD), OLED has the advantages of high contrast, wide viewing angle, low power consumption, and thinner volume. It is expected to become the next-generation flat-panel display technology after LCD. It is one of the most concerned technologies in flat panel display technology. [0003] Due to the inhomogeneity of TFT and OLED characteristics, under the same gray scale and data voltage, the brightness of OLED is different, and various regional panels with uneven brightness appear, that is, the Mura phenomenon. Mura refers to a phenomenon in which various t...

AI Technical Summary

Problems solved by technology

The current LTPS-TFT is limited by the crystallization process, and the uneven electrical properties at different positions on the glass substrate often cause uneven brightness of the OLED display device, which is the Mura that the human eye can perceive.

In order to make up for the yield loss caused by this unevenness, in addition to sub-pixel circuit compensation and process optimization, the panel industry currently introduces the De-Mura method of external brightness compensation. Among them, the method of grayscale compensation is widely used. It also achieves good results in Mura's heavier mid-to-low grayscale, but for the higher grayscale displayed by 8bit (or higher bit), De-Mura has encountered a ceiling, and can only achieve partial pixel grayscale reduction. Under the premise of standard brightness, the effect of high grayscale compensation is limited

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