Method for compensating pixel driving circuit of OLED display panel
AssigneeShenzhen China Star Optoelectronics Technology Co., Ltd.
InventorsYufeng Jin, Hongjun Xie
Life of this patent
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Abstract
Disclosed is a method for compensating a pixel driving circuit of an OLED display panel. In the compensation method, a driving transistor is enabled to operate stably in a saturation region for twice, and a threshold voltage of the driving transistor is calculated based on a collected charging voltage and charging time. A pixel driving circuit is compensated by establishing a threshold-voltage compensation table. The compensation method is easy to operate and can significantly improve a detecting speed of a threshold voltage. Moreover, an effect of a voltage-current conversion factor on detecting accuracy of a threshold voltage can be avoided.
Claims17
A method for compensating a pixel driving circuit of an OLED display panel,
- wherein the pixel driving circuit comprises a driving transistor and a storage capacitor, wherein a first plate of the storage capacitor is connected to a gate of the driving transistor, and a second plate of the storage capacitor is connected to a source/drain of the driving transistor and an anode of an OLED;
- and
- wherein the method comprises steps of:
- providing a detecting capacitor for each pixel, a first plate of the detecting to capacitor being connected to the anode of the OLED, and a second plate of the detecting capacitor being connected to ground;
- charging the detecting capacitor during a first detecting period, to a first charging voltage via the driving transistor, and recording a first charging time corresponding to the first charging voltage;
- charging the detecting capacitor during a second detecting period, to a second charging voltage via the driving transistor, and recording a second charging time corresponding to the second charging voltage;
- calculating a threshold voltage of the driving transistor based on the first charging voltage, the first charging time, the second charging voltage, and the second charging time;
- and
- establishing a threshold-voltage compensation table based on the threshold voltage of the driving transistor, and compensating the pixel driving circuit based on the threshold-voltage compensation table,
- wherein a value of a voltage between the two plates of the storage capacitor during the first detecting period is not equal to a value of a voltage between the two plates of the storage capacitor during the second detecting period.
Dependencies are inferred from the claim text.