Patent ID: 11915648
Assignee: CHENGDU BOE OPTOELECTRONICS TECHNOLOGY CO., LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 16:
17. A driving method of the display apparatus according to claim 1, the driving method comprising: in a frame:
transmitting, by pixel driving circuits, driving signals to light emitting devices of the plurality of sub-pixels according to image data of an image to be displayed; and
transmitting, by the emission time control chip, the emission time control signals to the emission time control circuits of the plurality of sub-pixels, so as to control durations of transmission of the driving signals to the light emitting devices of the plurality of sub-pixels; wherein the emission time control signals are pulse width modulation signals; wherein
the display panel further includes a data voltage terminal, a scan signal terminal, a first voltage terminal, an emission control signal terminal, an initial voltage terminal, and a reset signal terminal; and a pixel driving circuit of each sub-pixel includes a writing sub-circuit, a driving sub-circuit, an emission control sub-circuit, a first reset sub-circuit, and a second reset sub-circuit; the writing sub-circuit is electrically connected to the driving sub-circuit, the data voltage terminal, and the scan signal terminal; the driving sub-circuit is electrically connected to the emission control sub-circuit and the first voltage terminal; the emission control sub-circuit is electrically connected to the emission control signal terminal, the first voltage terminal, and the emission time control circuit; the first reset sub-circuit is electrically connected to the reset signal terminal, the initial voltage terminal, and the light emitting device of the sub-pixel; and the second reset sub-circuit is electrically connected to the reset signal terminal, the initial voltage terminal, and the driving sub-circuit; and
in a frame, each sub-pixel has a reset period, a scanning period, and a light emitting period in sequence; and transmitting, by the pixel driving circuits, the driving signals to the light emitting devices of the plurality of sub-pixels according to the image data of the image to be displayed includes:
in the reset period, transmitting, by the first reset sub-circuit, an initial voltage from the initial voltage terminal to the light emitting device in response to a reset signal from the reset signal terminal; and transmitting, by the second reset sub-circuit, the initial voltage to the driving sub-circuit in response to the reset signal;
in the scanning period, writing, by the writing sub-circuit, a data signal from the data voltage terminal into the driving sub-circuit in response to a scan signal from the scan signal terminal to perform a compensation of a threshold voltage on the driving sub-circuit; and
in the light emitting period, in response to an emission control signal from the emission control signal terminal, connecting, by the emission control sub-circuit, the first voltage terminal to the driving sub-circuit, and the driving sub-circuit to the emission time control circuit; and outputting, by the driving sub-circuit, the driving signal according to the data signal written into the driving sub-circuit and a first voltage signal from the first voltage terminal in response to the emission control sub-circuit, wherein a duration of an off level of the emission control signal is greater than or equal to 2H, and H represents a duration required by the sub-pixel to write the data signal.