OLED (Organic Light Emitting Diodes) pixel compensating circuit, display panel and display device

Abstract

The invention provides an OLED (Organic Light Emitting Diodes) pixel compensating circuit, a display panel and a display device, used for compensating threshold voltage and supply voltage of TFT (Thin Film Transistor) in an existing pixel circuit to overcome the asymmetry of image display. In the circuit, a first transistor in the circuit is used for transmitting a data signal to a first electrode of a first capacitor under the control of a scanning signal; a second transistor is used for transmitting a reference signal to the first electrode of the first capacitor under the control of a first light-emitting signal; a third transistor is used for connecting the grid of a driving transistor with a drain of the driving transistor under the control of the scanning signal, so as to read a difference between the supply voltage and the threshold voltage of the driving transistor, and transmitting the difference to a second electrode of the first capacitor and a first electrode of a second capacitor; and the driving transistor is used for generating a driving current to drive the OLED to light according to the supply voltage and the voltage on the second electrode of the first capacitor.

Description

technical field [0001] The invention relates to the field of display technology, in particular to an organic light emitting diode pixel compensation circuit, a display panel and a display device. Background technique [0002] Active Matrix Organic Light Emitting Diode (AMOLED) displays have been widely used due to their advantages of wide viewing angle, good color contrast effect, fast response speed and low cost. However, due to the unevenness and stability of the thin film transistor (Thin Film Transistor, TFT) backplane during the process, the threshold voltage will drift, which will lead to the unevenness of the entire image display. [0003] Moreover, as the size of the AMOLED continues to increase, the transmission line of the power supply used to supply power to each pixel circuit also continues to increase, resulting in the larger the size of the AMOLED, the more serious the voltage attenuation on the transmission line of the power supply, which affects the uniformit...

AI Technical Summary

Problems solved by technology

However, due to the unevenness and stability of the thin film transistor (Thin Film Transistor, TFT) backplane during the process, the threshold voltage will drift, which will lead to the unevenness of the entire image display.

[0003] Moreover, as the size of the AMOLED continues to increase, the transmission lines of the power supply used to supply power to each pixel circuit also continue to increase, resulting in the larger the size of the AMOLED, the more serious the voltage attenuation on the transmission lines of the power supply, which affects the uniformity of the display. sex

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