Compensation system and method of OLED display panel

Abstract

The invention provides a compensation system and method of an OLED display panel. The compensation system comprises a gray scale input module, a weighting modulation module, a compensation calculationmodule, a digital-to-analogue conversion, OLED sub-pixels and a current monitoring module. The compensation calculation module can calculate target feedback current corresponding an initial gray scale according to the initial gray scale input through the gray scale input module and pre-measured modulation factor and maximum feedback current and calculate a weighting coefficient according to the target feedback current and actual feedback currents, monitored by the current monitoring module, of the OLED sub-pixels, the weighting modulation module can adjust initial gray scale according to theweighting coefficient to obtain target gray scale and utilize the target gray scale to lighten the OLED sub-pixels, the uniform display phenomenon caused by ageing of organic light emitting diodes themselves can be compensated, the storage space required by the compensation system is decreased, and the picture uniformity of the display panel is improved.

Description

technical field [0001] The present invention relates to the field of display technology, and in particular, to a compensation system and method for an OLED display panel. Background technique [0002] Organic Light Emitting Display (OLED) display device has self-luminescence, low driving voltage, high luminous efficiency, short response time, high definition and contrast, nearly 180° viewing angle, and wide operating temperature range, which can realize flexible display and It has many advantages such as large-area full-color display and is recognized by the industry as the display device with the most development potential. [0003] OLED display devices can be divided into passive matrix OLED (Passive Matrix OLED, PMOLED) and active matrix OLED (Active Matrix OLED, AMOLED) two categories according to the driving method, namely direct addressing and thin film transistor (Thin Film Transistor, TFT) matrix addressing two categories. Among them, AMOLED has pixels arranged in ...

AI Technical Summary

Problems solved by technology

Usually AMOLED pixel driving circuits are equipped with driving thin film transistors for driving organic light emitting diodes to emit light. During use, due to the aging of organic light emitting diodes and the shift of the threshold voltage of driving thin film transistors, the display of OLED display devices The quality is degraded, so it is necessary to detect and compensate the threshold voltage of the driving thin film transistor during the use of the OLED display device, so as to ensure the display quality of the OLED display device

[0005] Although some compensation techniques solve the influence of Vth, the cost is that the complex compensation circuit reduces the pixel aperture ratio, and there is also a certain limit on the number of pixels per inch of the display panel. The evaporation process leads to characteristic differences between sub-pixels, such as OLED The cross-voltage and luminous efficiency are different. The existing solution is to use external optical compensation to make the panel display normally, but the external optical compensation needs to use expensive memory, and as the screen size increases, the memory space doubles. , thus greatly increasing the cost; and still unable to solve the impact of OLED device aging

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