Threshold voltage detection method of OLED (organic light emitting diode) driver thin film transistor

Abstract

The invention provides a threshold voltage detection method of an OLED (organic light emitting diode) driver thin film transistor. According to the method, by setting data signals, two different data voltages are offered, so that two different gate-source voltages are formed by virtue of the driver thin film transistor; then, by virtue of an external detection processing circuit, currents, passing through the driver thin film transistor under two different gate-source voltages, are detected; and by virtue of the two gate-source voltages, two current data and a calculating formula based on a driver thin film transistor current formula, a threshold voltage of the OLED driver thin film transistor is calculated by virtue of a central processing unit; therefore, the threshold voltage of the driver thin film transistor of each pixel in an OLED display device can be accurately acquired, and subsequently, a threshold voltage compensating effect of the OLED driver thin film transistor is improved and OLED display quality is enhanced.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a method for detecting the threshold voltage of an OLED driving thin film transistor. 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 generally include: a substrate, an anode disposed on the substrate, a hole injection layer disposed on the anode, a hole transport layer disposed on the hole injection layer, a light emitting layer disposed on the hole transport layer, a device An electron transport layer on the light em...

AI Technical Summary

Problems solved by technology

[0006] Generally, 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 will The quality is degraded, so it is necessary to 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, and the first task to realize the threshold voltage compensation is to complete the detection of the threshold voltage

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