Patent ID: 11875742
Assignee: BEIJING BOE DISPLAY TECHNOLOGY CO., LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 0:
1. A display drive circuit, comprising: a pixel circuit and a compensation circuit, wherein the pixel circuit comprises: a drive transistor, a light emitting device and a storage capacitor, two terminals of the storage capacitor are connected to a control electrode and a first electrode of the drive transistor, respectively, the first electrode of the drive transistor is connected to a first power supply terminal, a second electrode of the drive transistor is connected to a first electrode of the light emitting device, and the drive transistor is configured to provide a drive current to the light emitting device;
the pixel circuit further includes: a gating sub-circuit configured to control connection and disconnection between the control electrode of the drive transistor and a control terminal of the compensation circuit and control connection and disconnection between a second electrode of the light emitting device and a sensing terminal of the compensation circuit in response to a signal of a scanning line; and
the compensation circuit comprises:
a voltage generating sub-circuit configured to generate a sensing voltage positively correlated with the drive current according to the drive current flowing through the light emitting device and a target data voltage of a data receiving terminal; and
a voltage adjusting sub-circuit configured to adjust a voltage of the control terminal according to relationship of magnitude between the sensing voltage output by the voltage generating sub-circuit and a voltage of a second power supply terminal until the sensing voltage output by the voltage generating sub-circuit is equal to the voltage of the second power supply terminal,
wherein the voltage adjusting sub-circuit comprises: a comparison module, a first resistance module and a second resistance module,
the comparison module is connected to the voltage generating sub-circuit, the second power supply terminal and the second resistance module, the comparison module is configured to output a voltage to the second resistance module, and when the sensing voltage output by the voltage generating sub-circuit is greater than the voltage of the second power supply terminal, the output voltage is increased until the sensing voltage output by the voltage generating sub-circuit is equal to the voltage of the second power supply terminal; when the sensing voltage output by the voltage generating sub-circuit is less than the voltage of the second power supply terminal, the output voltage is decreased until the sensing voltage output by the voltage generating sub-circuit is equal to the voltage of the second power supply terminal; and
the first resistance module and the second resistance module are connected in series between the first power supply terminal and the second power supply terminal, a connecting node between the first resistance module and the second resistance module is the sensing terminal of the compensation circuit, the second resistance module has an adjustable resistance, and the resistance of the second resistance module is positively correlated with the output voltage of the comparison module.