Brightness compensation method, brightness compensation circuit and display device

Abstract

The invention discloses a brightness compensation method, a brightness compensation circuit and a display device. The brightness compensation method includes the steps: a display panel acquires a reference compensation coefficient from a flash memory at the beginning of display; the obtained reference compensation coefficient is stored in a random access memory; and finally, a scaling coefficientcorresponding to the current to-be-displayed frame image is obtained, and the reference compensation coefficient corresponding to each sub-pixel in the random access memory is multiplied by the scaling coefficient to generate a target compensation coefficient corresponding to the current to-be-displayed frame image and display according to the target compensation coefficient. By means of the compensation method, no matter how many frame frequencies are supported by the display panel, as only the reference compensation coefficients need to be stored in the random access memory and the flash memory, compared with an existing driving method, the size can be reduced by at least one time, and when the frame frequency is switched, the target compensation coefficient can be obtained only by multiplying the reference compensation coefficient by the scaling coefficient, and the compensation coefficient does not need to be reloaded, so that the switching time is short, and a screen does not needto be turned off.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a brightness compensation method, a brightness compensation circuit and a display device. Background technique [0002] The organic light-emitting display panel has different threshold values ​​due to different crystallization degrees of low-temperature polysilicon transistors, and the film thickness of the entire display panel is not completely uniform, and the final result is display unevenness (mura). OLED display panels need to eliminate display unevenness (demura) before leaving the factory. Since the demura coefficients corresponding to different frame rates are not the same, there are two methods in the prior art. Take the display panel that can display two frame rates as an example: one of them is to store two sets of Demura compensation coefficients in the flash memory (Flash), and when the display panel is turned on, the two sets (such as 60Hz and 90Hz) can be simulta...

AI Technical Summary

Problems solved by technology

However, the above two methods have the following technical problems: 1. It is necessary to store two sets of Demura compensation coefficients, and the space of the Flash will be doubled, and the cost will be increased; 2. The RAM size of the DDIC will be doubled, and the size and cost of the DDIC will increase. Increase; 3. When switching the frame rate, because the Demura compensation coefficient needs to be reloaded, it needs to go through the process of turning off the screen → erasing data → reloading data → turning on the screen, so the switching time is longer, and the screen needs to be turned off. poor user experience

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