Pixel compensation device, pixel compensation method and display apparatus

A pixel compensation device, comprising:

• a controller;
• and
• at least one external compensation circuit connected to the controller;
• wherein an external compensation circuit is configured to be connected to at least one pixel driving circuit;
• the pixel driving circuit includes a driving sub-circuit, and a first terminal of the driving sub-circuit is configured to be connected to a light-emitting device;
• and a light-emitting driving period of the pixel driving circuit includes an initialization phase, a pre-storage phase and a data compensation writing phase;
• wherein the external compensation circuit includes a first input circuit, a second input circuit and a sensing circuit;
• the first input circuit is connected to the sensing circuit;
• the first input circuit is configured to be further connected to the first terminal of the driving sub-circuit;
• and the first input circuit is further configured to:
• transmit a first voltage to the first terminal of the driving sub-circuit in the initialization phase;
• perform blanking in the pre-storage phase;
• and transmit a threshold compensation voltage to the first terminal of the driving sub-circuit in the data compensation writing phase;
• the second input circuit is configured to be connected to a control terminal of the driving sub-circuit;
• the second input circuit is further configured to transmit a second voltage to the control terminal of the driving sub-circuit in the initialization phase and the pre-storage phase, so that a voltage of the first terminal of the driving sub-circuit changes from the first voltage to the threshold compensation voltage in the pre-storage phase;
• wherein the first voltage and the threshold compensation voltage are both less than a turn-on voltage of the light-emitting device, and the threshold compensation voltage is equal to a difference between the second voltage and a threshold voltage of the driving sub-circuit;
• the sensing circuit is configured to be further connected to the first terminal of the driving sub-circuit, and the sensing circuit is further configured to:
• sense the threshold compensation voltage in the data compensation writing phase;
• and transmit the threshold compensation voltage to the first input circuit;
• the controller is configured to be further connected to the control terminal of the driving sub-circuit, and the controller is further configured to transmit a data voltage to the control terminal of the driving sub-circuit in the data compensation writing phase.