Organic light emitting diode pixel circuit integrated with external processor and driving method thereof

Abstract

The invention provides an organic light emitting diode pixel circuit integrated with an external processor and a driving method thereof, which can eliminate influences caused by transistor threshold voltage variation. However, due to influences of factors such as internal parasitic parameters of the transistor, the threshold voltage variation is not always completely counteracted, and thus, through the external processor, in a light emitting stage, sensing and compensation value calculation are carried out for anode voltage of the organic light emitting diode, the originally-outputted data voltage is adjusted through the compensation value, and influences of uneven brightness caused by threshold voltage variation and organic light emitting diode deterioration are improved.

Description

technical field [0001] The technology of the present invention relates to the field of display panels, and in particular refers to an active organic light-emitting diode pixel circuit that integrates an external processor to improve OLED degradation or uneven brightness caused by threshold voltage variation. Background technique [0002] Due to the limited thin film transistor (TFT) process conditions of the current active organic light emitting diode (AMOLED), its threshold voltage (Threshould Voltage, Vth) will drift under long-term pressure and high temperature. Furthermore, due to the different display screens, the threshold voltage shifts of the thin film transistors in each part of the panel are also different, forming non-uniformity of each threshold voltage, which will be converted into organic light-emitting diode (OLED) display devices. The current difference and brightness difference are finally perceived by human eyes, which is the so-called brightness unevenness...

AI Technical Summary

Problems solved by technology

The internal pixel circuit of the traditional organic light-emitting diode panel, because there is no compensation design for the drift of the threshold voltage, there will be serious brightness unevenness when displaying the picture. Therefore, in the current process, in order to overcome the problem of non-uniformity , mostly improve the pixel circuit structure to compensate for the problem of threshold voltage drift

[0003] After continuous research and development in recent years, the internal pixel compensation circuit architecture has reached the bottleneck stage, and it is difficult to have a practical architecture breakthrough. In fact, due to the influence of thin film transistor parasitic parameters and driving speed, the threshold voltage cannot be completely offset. When the deviation exceeds a certain range, the consistency of the current cannot be guaranteed

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