Pixel compensating circuit

Abstract

The invention provides a pixel compensating circuit. The pixel compensating circuit comprises a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor, a sixth transistor, a first capacitor, a second capacitor and an organic light emitting diode, wherein each of the first transistor, the second transistor, the third transistor, the fourth transistor, thefifth transistor and the sixth transistor comprises a drain electrode, a source electrode and a grid electrode. For the pixel compensating circuit provided by the invention, the compensation for thethreshold voltage of the drive transistors is realized, no matter whether the threshold voltage is a positive value or a negative value, and the compensation for the current attenuation of the organiclight emitting diode is realized.

Description

technical field [0001] The present invention relates to the field of pixel circuits based on transistors, in particular to a pixel compensation circuit. Background technique [0002] In transistor-based pixel circuits, the driving transistor serves as the core transistor to provide driving current to the organic light-emitting diode (OLED), thereby lighting up each pixel. The magnitude of the current directly determines the brightness of the pixel. However, during the working process of the pixel circuit, the threshold voltage of the driving transistor will drift due to the long-term operation of the transistor under the gate voltage, which will affect the stability of the driving current. Although many existing compensation circuits compensate the threshold voltage of the driving transistor, most of them can only compensate the enhanced (positive threshold voltage) driving transistor due to structural limitations; and the driving transistor is likely to be in a depleted sta...

AI Technical Summary

Problems solved by technology

However, during the working process of the pixel circuit, the threshold voltage of the driving transistor will drift due to the long-term operation of the transistor under the gate voltage, which will affect the stability of the driving current.

Although many existing compensation circuits compensate the threshold voltage of the driving transistor, most of them can only compensate the enhanced (positive threshold voltage) driving transistor due to structural limitations; and the driving transistor is likely to be in a depleted state (negative threshold voltage), so this type of compensation circuit is very limited

[0003] In addition, the turn-on voltage of organic light-emitting diodes (OLEDs) also tends to increase with the increase of working time, which means that under the same driving current conditions, the brightness emitted by organic light-emitting diodes will increase with the working time. increase and decrease

In the prior art, there are relatively few circuits for compensating for this problem

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