Pixel circuit, driving method thereof, and display device

A method of driving a pixel circuit comprising a light-emitting device, a reset circuit, a write circuit, a compensation circuit configured to selectively transfer an uncompensated reference voltage or a compensated reference voltage to a third node, the compensated reference voltage being determined by the uncompensated reference voltage and a compensation voltage, the compensation voltage being related to a rated value of a power supply voltage, a light emission control circuit, and a drive circuit, the method comprising:

• in a reset phase, resetting by the reset circuit a first node and a second node;
• in a data write phase, writing by the write circuit a data voltage to the first node and a transition voltage to the second node;
• and
• in a light emission phase, selectively transferring by the light emission control circuit a voltage at the third node to the first node, providing by the light emission control circuit a path along which a drive current flows from a first power supply terminal to a second power supply terminal through the light-emitting device, and controlling by the drive circuit a magnitude of the drive current based on the voltage at the second node and the power supply voltage.

A display device, comprising:

• a plurality of scan lines for transferring scan signals;
• a plurality of light emission control lines for transferring light emission control signals;
• a plurality of data lines for transferring data voltages;
• and
• a plurality of pixels arranged in an array,
• wherein a pixel of the plurality of pixels arranged in an n-th row and an m-th column comprises:
• a light-emitting device;
• a reset circuit configured to reset a first node and a second node in response to the scan signal on an n-th one of the scan lines being active;
• a write circuit configured to, responsive to the scan signal on an (n+1)-th one of the scan lines being active, write the data voltage on an m-th one of the data lines to the first node and write a transition voltage to the second node, the transition voltage being related to an instantaneous value of a power supply voltage received at a first power supply terminal;
• a compensation circuit configured to selectively transfer an uncompensated reference voltage or a compensated reference voltage to a third node, the compensated reference voltage being determined by the uncompensated reference voltage and a compensation voltage, the compensation voltage being related to a rated value of the power supply voltage;
• a light emission control circuit configured to, responsive to the light emission control signal on an n-th one of the light emission control lines being active, transfer a voltage at the third node to the first node and provide a path along which a drive current flows from the first power supply terminal to a second power supply terminal through the light-emitting device, wherein the transfer of the voltage at the third node to the first node is configured to cause a change in a voltage at the second node;
• and
• a drive circuit configured to control a magnitude of the drive current based on the voltage at the second node and the power supply voltage, and
• wherein n and m are positive integers.