EP-4738331-A1 - PIXEL CIRCUIT DRIVING METHOD, APPARATUS, AND DEVICE

EP4738331A1EP 4738331 A1EP4738331 A1EP 4738331A1EP-4738331-A1

Abstract

This application discloses a method for driving a pixel circuit, an apparatus, and a device, and relates to the field of display technologies, to resolve an excessively large brightness difference between a non-emitting phase and an emitting phase in a picture display process, an excessively long non-emitting time, and excessively strong flickers caused by non-emitting or weak emitting in a part of periods. In this application, duty cycles can be flexibly and unevenly configured for duration of level phases in control periods. For example, duration of one or more level phases that are used for emitting and that are after anode reset is flexibly configured depending on whether each control period is used for the anode reset, or differentiated driving is performed, in a refresh frame period and a holding frame period based on different reset frequencies and/or different displaying refresh rates, for level phases not used for the emitting. On a premise that it is ensured that pixels can normally emit in the control periods, emitting in a plurality of control periods is uniform, or an emitting duty cycle is increased to optimize screen flickering, thereby achieving better display and eye comfort effect.

Inventors

FU, RUHAI
LI, XIAO
MENG, Chao

Assignees

Huawei Technologies Co., Ltd.

Dates

Publication Date: 20260506
Application Date: 20250102

Claims (20)

A method for driving a pixel circuit, wherein a display period of the pixel circuit comprises a plurality of consecutive control periods, each of the plurality of control periods comprises a first level phase not used for emitting and a second level phase used for the emitting, the plurality of control periods comprise a first control period, the first control period is used for anode reset, the pixel circuit comprises an emitting control circuit and an anode reset circuit, the anode reset circuit receives an anode reset control signal, and controls the anode reset based on the first control period, and the method comprises: detecting a screen brightness value; when the screen brightness value is less than a first brightness threshold, configuring duration of second level phases in the plurality of control periods based on the first control period; and receiving, by the emitting control circuit, an emitting control signal, and controlling the emitting based on duration of first level phases and the duration of the second level phases in the plurality of control periods.
The method according to claim 1, wherein the plurality of control periods further comprise a second control period, the second control period is not used for the anode reset, and the configuring the duration of the second level phases in the plurality of control periods based on the first control period comprises: configuring duration of a second level phase in the first control period as first duration, and configuring duration of a second level phase in the second control period as second duration, wherein the first duration is greater than the second duration.
The method according to claim 2, wherein the first control period comprises at least one second level phase, and the first duration comprises total duration of the at least one second level phase in the first control period.
The method according to claim 2 or 3, wherein the plurality of control periods further comprise a third control period, the third control period is a control period after the first control period, the third control period is not used for the anode reset, and the configuring the duration of the second level phases in the plurality of control periods based on the first control period comprises: configuring duration of a second level phase in the third control period as third duration, wherein the third duration is greater than the second duration.
The method according to claim 4, wherein the third control period comprises at least one second level phase, and the third duration comprises total duration of the at least one second level phase in the third control period.
The method according to claim 4 or 5, wherein the third duration is less than or equal to the first duration.
The method according to any one of claims 1 to 6, wherein the first level phase is a high level phase, and the second level phase is a low level phase; or the first level phase is a low level phase, and the second level phase is a high level phase.
The method according to any one of claims 1 to 7, wherein the first control period comprises at least one control period; and/or the second control period comprises at least one control period; and/or the third control period comprises at least one control period.
A method for driving a pixel circuit, wherein a display period of the pixel circuit comprises a plurality of consecutive control periods, each of the plurality of control periods comprises a first level phase not used for emitting and a second level phase used for the emitting, the plurality of control periods comprise a refresh frame period, the refresh frame period is used for displaying refresh and gate reset, the pixel circuit comprises an emitting control circuit and a reset circuit, the reset circuit receives a reset control signal, and controls the gate reset and the displaying refresh based on the refresh frame period, and the method comprises: detecting a screen brightness value; when the screen brightness value is greater than a second brightness threshold, configuring duration of first level phases in the plurality of control periods based on a displaying refresh rate corresponding to an emitting control signal and/or a reset frequency corresponding to the reset control signal; and receiving, by the emitting control circuit, the emitting control signal, and controlling the emitting based on the duration of the first level phases and duration of second level phases in the plurality of control periods.
The method according to claim 9, wherein the plurality of control periods further comprise a holding frame period, the holding frame period is used for display holding, the displaying refresh rate corresponding to the emitting control signal is a first refresh rate, the reset frequency corresponding to the reset control signal is a first frequency, and the configuring the duration of the first level phases in the plurality of control periods based on the displaying refresh rate corresponding to the emitting control signal and/or the reset frequency corresponding to the reset control signal comprises: configuring duration of a first level phase in the refresh frame period as fourth duration, and configuring duration of a first level phase in the holding frame period as fifth duration, wherein the fifth duration is less than the fourth duration.
The method according to claim 9, wherein the plurality of control periods further comprise a holding frame period, the holding frame period is used for display holding, the displaying refresh rate corresponding to the emitting control signal is a second refresh rate, the second refresh rate is less than a first refresh rate, the reset frequency corresponding to the reset control signal is a first frequency, and the configuring the duration of the first level phases in the plurality of control periods based on the displaying refresh rate corresponding to the emitting control signal and/or the reset frequency corresponding to the reset control signal comprises: configuring duration of a first level phase in the refresh frame period as fourth duration, and configuring duration of a first level phase in the holding frame period as sixth duration, wherein the sixth duration is less than the fourth duration, and the sixth duration is greater than fifth duration.
The method according to any one of claims 9 to 11, wherein the first level phase is a high level phase, and the second level phase is a low level phase; or the first level phase is a low level phase, and the second level phase is a high level phase.
The method according to any one of claims 10 to 12, wherein the refresh frame period comprises one control period; and/or the holding frame period comprises at least one control period.
A display, wherein the display comprises an integrated circuit, a gate drive unit, and a pixel circuit, a display period of the pixel circuit comprises a plurality of consecutive control periods, each of the plurality of control periods comprises a first level phase not used for emitting and a second level phase used for the emitting, the plurality of control periods comprise a first control period, the first control period is used for anode reset, and the pixel circuit comprises an emitting control circuit and an anode reset circuit; the anode reset circuit is configured to: receive an anode reset control signal, and control the anode reset based on the first control period; the integrated circuit is configured to: obtain a screen brightness value, and when the screen brightness value is less than a first brightness threshold, configure duration of second level phases in the plurality of control periods based on the first control period; and the emitting control circuit is configured to: receive an emitting control signal, and control the emitting based on duration of first level phases and the duration of the second level phases in the plurality of control periods.
The display according to claim 14, wherein the plurality of control periods further comprise a second control period, the second control period is not used for the anode reset, and the integrated circuit is specifically configured to: configure duration of a second level phase in the first control period as first duration, and configure duration of a second level phase in the second control period as second duration, wherein the first duration is greater than the second duration.
The display according to claim 15, wherein the first control period comprises at least one second level phase, and the first duration comprises total duration of the at least one second level phase in the first control period.
The display according to any one of claims 14 to 16, wherein the plurality of control periods further comprise a third control period, the third control period is a control period after the first control period, the third control period is not used for the anode reset, and the integrated circuit is further configured to: configure duration of a second level phase in the third control period as third duration, wherein the third duration is greater than the second duration.
The display according to claim 17, wherein the third control period comprises at least one second level phase, and the third duration comprises total duration of the at least one second level phase in the third control period.
The display according to claim 17 or 18, wherein the third duration is less than or equal to the first duration.
The display according to any one of claims 14 to 19, wherein the first level phase is a high level phase, and the second level phase is a low level phase; or the first level phase is a low level phase, and the second level phase is a high level phase.

Description

This application claims priority to Chinese Patent Application No. 202410175957.3, filed with the China National Intellectual Property Administration on February 7, 2024 and entitled "METHOD FOR DRIVING PIXEL CIRCUIT, APPARATUS, AND DEVICE", which is incorporated herein by reference in its entirety. TECHNICAL FIELD This application relates to the field of display technologies, and in particular, to a method for driving a pixel circuit, an apparatus, and a device. BACKGROUND Currently, when a display of an electronic device displays a picture, a dimming strategy such as pulse-width modulation (pulse-width modulation, PWM) or direct current (direct current, DC) modulation is usually used to perform dimming, to achieve good display effect and improve visual experience of a user. For example, in a conventional technology, an error of emitting duration of each emitting period in a picture frame is usually controlled to be kept within a given range, to implement consistency of emitting periods, thereby improving the visual experience of the user. However, because the display usually further includes other components such as an electroluminance (electroluminance, EL) component and an anode of a pixel circuit, or operations such as data writing, anode reset, and gate reset need to be performed in some periods, the data writing, the gate reset, or anode reset of the EL component may shorten emitting duration of one or more periods, or cause a part or all of emitting currents in a period to be used for charging a component (such as a capacitor) instead of pixel emitting, leading to an excessively large brightness difference between a non-emitting phase and an emitting phase in a picture display process, an excessively long non-emitting time, and excessively strong flickers caused by non-emitting or weak emitting in a part of periods. SUMMARY This application provides a method for driving a pixel circuit, an apparatus, and a device, to resolve an excessively large brightness difference between a non-emitting phase and an emitting phase in a picture display process, an excessively long non-emitting time, and excessively strong flickers caused by non-emitting or weak emitting in a part of periods, thereby improving visual experience of a user upon use. To achieve the foregoing objective, this application uses the following technical solutions. According to a first aspect, a method for driving a pixel circuit is provided. A display period of the pixel circuit includes a plurality of consecutive control periods, each of the plurality of control periods includes a first level phase not used for emitting and a second level phase used for the emitting, the plurality of control periods include a first control period, the first control period is used for anode reset, the pixel circuit includes an emitting control circuit and an anode reset circuit, the anode reset circuit receives an anode reset control signal, and controls the anode reset based on the first control period, and the method includes: detecting a screen brightness value; when the screen brightness value is less than a first brightness threshold, configuring duration of second level phases in the plurality of control periods based on the first control period; and receiving, by the emitting control circuit, an emitting control signal, and controlling the emitting based on duration of first level phases and the duration of the second level phases in the plurality of control periods. For example, the foregoing method may be applied to a display panel, a display, or an electronic device including a display, such as a mobile phone or a tablet computer. This is not limited. For example, the first level phase in the control period is, for example, a high level phase, and the second level phase is, for example, a low level phase. Alternatively, the first level phase is, for example, a low level phase, and the second level phase is, for example, a high level phase. This is not limited. According to the solution provided in the first aspect, in a scenario in which the screen brightness value is less than the first brightness threshold, for example, in a medium and low brightness scenario, duty cycles are flexibly and unevenly configured, based on an actual case such as whether the control periods are used for the anode reset, for duration of level phases (for example, second level phases) used for the emitting in the control periods. For example, duration of one or more second level phases after the anode reset is flexibly configured. On a premise that it is ensured that pixels can normally emit in the control periods, the emitting in the plurality of control periods is uniform, and screen flickering is optimized, thereby achieving better display and eye comfort effect. In a possible implementation, the plurality of control periods further include a second control period, the second control period is not used for the anode reset, and the configuring the duration of the seco