Pixel circuit, display panel, and display device

摘要

A pixel driving circuit includes a signal loading component, a storage capacitor, a compensation component, a mirror component, and a drive transistor. In a data transmission stage, the signal loading component transmits a received image data signal to the gate of a drive transistor, which is stored in a storage capacitor; and in a threshold voltage compensation stage, the compensation component connects the gate of the drive transistor to the source of the drive transistor so as to generate a drive signal dependent upon the threshold voltage of the drive transistor from the signal stored in the storage capacitor and to drive an organic light emitting diode to emit light, thus eliminating an influence of the threshold voltage of the drive transistor on the current through the organic light emitting diode and preventing the brightness of the organic light emitting diode from varying over its operating period of time.

主权项

1. A pixel circuit for driving an organic light emitting diode, the pixel circuit comprising a signal loading component, a storage capacitor, a compensation component, a mirror component, and a drive transistor, wherein
the signal loading component is configured to transmit a received image data signal to a gate of the drive transistor in a data transmission stage, wherein the signal loading component comprises a first end configured to receive the image data signal, a second end configured to receive a first control signal, and a third end configured to connect with the gate of the drive transistor; the storage capacitor is configured to store a signal at the gate of the drive transistor, wherein the storage capacitor comprises one end connected with the drain of the drive transistor and another end connected with the gate of the drive transistor; the drive transistor is configured to generate current at a drain thereof according to a difference between the signal stored at the gate thereof and a signal at a source thereof in a light emission stage, wherein the drain of the drive transistor is configured to receive a first power supply signal; the compensation component is configured to connect the gate of the drive transistor to the source of the drive transistor in a threshold voltage compensation stage to generate a drive signal from the image data signal stored in the storage capacitor in the data transmission stage, wherein the compensation component comprises a first end configured to receive a second control signal, a second end connected with the gate of the drive transistor, and a third end connected with the source of the drive transistor; the mirror component is configured to mirror the current generated by the drive transistor at the drain thereof into the organic light emitting diode in the light emission stage so that the organic light emitting diode emits light with a difference in voltage between the first power supply signal and a second power supply signal, wherein the mirror component comprises a first end configured to receive a third control signal, a second end connected with the source of the drive transistor, a third end configured to receive the second power supply signal, and a fourth end connected with a cathode of the organic light emitting diode; and the organic light emitting diode comprises an anode configured to receive the first power supply signal.