Compensation system and method for oled display panel

Abstract

A compensation system and method for an organic light-emitting diode (OLED) display panel. The compensation system comprises: a gray scale input module (10), a weighting modulation module (20), a compensation calculation module (30), a digital-to-analogue conversion module (50), OLED sub-pixels (60) and a current monitoring module (70). The compensation calculation module (30) may calculate a target feedback current corresponding to an initial gray scale according to an initial gray scale inputted by the gray scale input module (10), a pre-measured modulation coefficient and maximum feedback current and calculate a weighting coefficient according to the target feedback current and an actual feedback current of the OLED sub-pixels (60) monitored by the current monitoring module (70); the weighting modulation module (20) may adjust the initial gray scale according to the weighting coefficient to obtain a target gray scale and utilize the target gray scale to illuminate the OLED sub-pixels (60), so that the phenomenon of nonuniform display caused by ageing of an organic light emitting diode may be compensated for, the storage space required by a compensation system is decreased, and the picture uniformity of the display panel is improved.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a compensation system and method for an OLED display panel. Background technique [0002] Organic light emitting diode (Organic Light Emitting Display, OLED) display device has self-illumination, low driving voltage, high luminous efficiency, short response time, high definition and contrast, nearly 180° viewing angle, wide operating temperature range, and can realize flexible display and With many advantages such as large-area full-color display, it is recognized by the industry as a display device with the most potential for development. [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 types. Among them, AMOLED has pixels arrang...

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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