Patent ID: 9633605
Date: 2017-04-25
CPC Classifications: G09G

Claim:
1. A method for driving a pixel circuit, the method comprising: providing an emission element with current corresponding to a gray scale data voltage during a light-emitting period of a horizontal period; writing the gray scale data voltage to a gate of a driving transistor through a first path during a first period of the horizontal period such that a voltage level of the gate of the driving transistor is same as a voltage level of the gray scale data voltage; shifting the voltage level of the gray scale data voltage written at the gate of the driving transistor during the first period to set an initialization voltage of the driving transistor during a second period of the horizontal period, the second period being after the first period and before the light-emitting period in the horizontal period; shifting the gray scale data voltage being shifted during the second period according to a threshold voltage of the driving transistor through a second path including the driving transistor during a third period of the horizontal period, the second path being different from the first path; and changing a voltage level of a second control signal coupled to a terminal of a capacitor electrically connected to a gate of the driving transistor, the voltage level of the second control signal changed between a first operation of writing the gray scale data voltage through the first path and a second operation of writing the gray scale data voltage through the second path, wherein providing the emission element with the current corresponding to the gray scale data voltage is after the second operation, wherein: the first operation is performed by turning on a first switch and writing the gray scale data voltage to the gate of the driving transistor through the first switch, the first switch electrically connected to a gray scale data signal line providing the gray scale data voltage and the gate of the driving transistor, the first switch controlled by a first control signal, and the second operation is performed by turning on a second switch and writing the gray scale data voltage to the gate of the driving transistor through the second switch and the driving transistor, the second switch electrically connected to a terminal and the gate of the driving transistor, the second switch controlled by a third control signal, and wherein the first operation is performed when the second switch is turned off.