Driving method of pixel circuit

Inventors: Po-Cheng Lai (Hsinchu City, TW); Ming-Ci Siao (Hsinchu City, TW); Wei-Ting Wu (Hsinchu City, TW); Wei-Jen Chen (Hsinchu City, TW); Hung-Chi Chen (Hsinchu City, TW); Po-Chun Lai (Hsinchu City, TW); Yi-Yo Dai (Hsinchu City, TW); Li-Wei Shih (Hsinchu City, TW)

Assignee: AUO Corporation

G09G3/3233 G09G2320/0247 G09G2320/064

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Quick Facts

Patent No.: US 12706047
App. No.: 19/206,120
Granted: Aug 11, 2026
Kind: B2

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Abstract

A driving method of a pixel circuit includes: providing a preset light-emission control signal to the pixel circuit, in which the pixel circuit includes a light-emitting element; measuring the light-emitting element while the light-emitting element emits light according to the preset light-emission control signal, thereby obtaining an initial instantaneous brightness waveform of the light-emitting element; and modulating the number of plural pulse signals included in each display frame of the preset light-emission control signal and the pulse width of each of the pulse signals according to the initial instantaneous brightness waveform, thereby generating a compensated light-emission control signal; and providing the compensated light-emission control signal to the pixel circuit. In response to the light-emitting element emitting light according to the compensated light-emission control signal, an instantaneous brightness waveform of the light-emitting element appears to converge in each display frame.

Claims (26)

1 . A driving method of a pixel circuit, comprising:

providing a preset light-emission control signal to the pixel circuit, wherein the pixel circuit comprises a light-emitting element;

measuring the light-emitting element while the light-emitting element emits light according to the preset light-emission control signal, thereby obtaining an initial instantaneous brightness waveform of the light-emitting element;

modulating a number of plural pulse signals included in each display frame of the preset light-emission control signal and a pulse width of each of the pulse signals according to the initial instantaneous brightness waveform, thereby generating a compensated light-emission control signal; and

providing the compensated light-emission control signal to the pixel circuit, wherein in response to the light-emitting element emitting light according to the compensated light-emission control signal, an instantaneous brightness waveform of the light-emitting element appears to converge in each display frame;

wherein modifications to the pulse width of each of the pulse signals are determined based on a brightness magnitude at corresponding time points in the initial instantaneous brightness waveform.

2 . The driving method according to claim 1 , wherein each display frame comprises a refresh frame and at least one skip frame, wherein each of the refresh frame and the at least one skip frame in each display frame of the preset light-emission control signal comprises one pulse signal, wherein each of the refresh frame and the at least one skip frame in each display frame of the compensated light-emission control signal comprises at least two pulse signals, wherein the pixel circuit is operated at a low refresh rate.

3 . The driving method according to claim 2 , wherein numbers of the at least two pulse signals respectively included in the refresh frame and the at least one skip frame in each display frame of the compensated light-emission control signal are identical to each other.

4 . The driving method according to claim 3 , wherein pulse widths of the at least two pulse signals included in each of the at least one skip frame in each display frame of the compensated light-emission control signal are different from each other.

5 . The driving method according to claim 3 , wherein the at least two pulse signals included in each of the at least one skip frame in each display frame of the compensated light-emission control signal comprise a preceding pulse signal and a succeeding pulse signal later than the preceding pulse signal, wherein a pulse width of the preceding pulse signal is greater than a pulse width of the succeeding pulse signal.

6 . The driving method according to claim 3 , wherein the at least two pulse signals included in each of the at least one skip frame in each display frame of the compensated light-emission control signal comprise a preceding pulse signal and a succeeding pulse signal later than the preceding pulse signal, wherein a pulse width of the preceding pulse signal is less than a pulse width of the succeeding pulse signal.

7 . The driving method according to claim 2 , wherein numbers of the at least two pulse signals respectively included in the refresh frame and the at least one skip frame in each display frame of the compensated light-emission control signal are not all the same.

8 . The driving method according to claim 7 , wherein pulse widths of the at least two pulse signals included in each of the refresh frame and the at least one skip frame in each display frame of the compensated light-emission control signal are identical to each other.

9 . The driving method according to claim 2 , wherein each display frame comprises at least three skip frames, and a pulse width of a j-th pulse signal of the at least two pulse signals included in an i-th skip frame of the at least three skip frames is greater than a pulse width of a j-th pulse signal of the at least two pulse signals included in an (i+2)-th skip frame of the at least three skip frames, wherein i and j are natural numbers.

10 . The driving method according to claim 2 , wherein each display frame comprises at least three skip frames, and a pulse width of a j-th pulse signal of the at least two pulse signals included in an i-th skip frame of the at least three skip frames is less than a pulse width of a j-th pulse signal of the at least two pulse signals included in an (i+2)-th skip frame of the at least three skip frames, wherein i and j are natural numbers.

11 . The driving method according to claim 2 , further comprising:

increasing a frequency of the preset light-emission control signal in the refresh frame and the at least one skip frame included in each display frame to modulate the number of the pulse signals included in each display frame of the preset light-emission control signal.

12 . The driving method according to claim 1 , further comprising:

using a display color analyzer to measure the light-emitting element while the light-emitting element emits light according to the preset light-emission control signal.

13 . A driving method of a pixel circuit, comprising:

providing a preset light-emission control signal to the pixel circuit, wherein the pixel circuit comprises a light-emitting element;

providing the compensated light-emission control signal to the pixel circuit;

wherein each display frame comprises a refresh frame and at least one skip frame, wherein each of the refresh frame and the at least one skip frame in each display frame of the preset light-emission control signal comprises one pulse signal, wherein each of the refresh frame and the at least one skip frame in each display frame of the compensated light-emission control signal comprises at least two pulse signals.

14 . The driving method according to claim 13 , wherein in response to the light-emitting element emitting light according to the compensated light-emission control signal, an instantaneous brightness waveform of the light-emitting element appears to converge in each display frame, wherein the pixel circuit is operated at a low refresh rate.