Peripheral compensation system and method of pixel matrix and display system

Abstract

The invention provides a peripheral compensation system and method of a pixel matrix and a display system. The peripheral compensation system includes a row scanning driver (200), a compensator (400) and a column driver (300), wherein the column driver (300) includes a display signal generation module (301), and the display signal generation module (301) includes a first digital-to-analog conversion module (311) having a gamma correction function, a second digital-to-analog conversion module (312) and a first analog addition module (313). While performing precise gamma correction on a digital original signal, the peripheral compensation system is simple in structure, and the number of bits of the first digital-to-analog conversion module is small; and the peripheral compensation system can also perform correction operation during display of a display system, thereby greatly increasing the refreshing frequency of compensation information.

Description

technical field [0001] The present application relates to the field of display technology, in particular to a peripheral compensation system, method and display system of a pixel matrix. Background technique [0002] Due to the advantages of high brightness, high luminous efficiency, wide viewing angle and low power consumption, Organic Light-Emitting Diode (OLED) has been extensively studied in recent years and has been rapidly applied to a new generation of display systems. There are two driving methods of organic light emitting diodes: passive matrix driving (Passive Matrix OLED, PMOLED) and active matrix driving (Active Matrix OLED, AMOLED). Although the cost of the passive matrix driving method is low, it cannot realize high-resolution display because of the phenomenon of crosstalk. In addition, the passive matrix driving current is large, which will reduce the service life of the organic light emitting diode. In contrast, the active matrix driving method is to set a d...

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Problems solved by technology

[0006] The structure circuit of the two thin film field effect transistors of the pixel unit driven by the active matrix above is simple, but as time goes by, the components in it will age, especially the drive transistor and the organic light emitting diode will age, directly The consequence is that the threshold voltages of the driving transistor and the organic light-emitting diode will drift, and the threshold voltage drift of the driving transistor and the organic light-emitting diode in each pixel unit in the pixel matrix is ​​also different; made, which will lead to the threshold voltage V of the driving transistor of each pixel unit in the pixel matrix TH It has the characteristics of non-uniformity; in the above two cases, according to the formula (1), it can be seen that the driving current I DS At this time, it will change, which will cause the inhomogeneity of the pixel matrix display

[0007] Aiming at the problem of non-uniform pixel matrix display caused by threshold voltage drift and non-uniformity of driving transistors and organic light-emitting diodes, there are currently two types of threshold voltage compensation methods: pixel unit internal compensation and peripheral compensation

Compensation within the pixel unit is to provide a constant driving current for the organic light-emitting diode through a complex pixel unit circuit structure. In comparison, a simpler pixel unit structure can be used, so it is more suitable for industrial applications

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