US-12626656-B2 - Driving method for a display panel and display device

US12626656B2US 12626656 B2US12626656 B2US 12626656B2US-12626656-B2

Abstract

A driving process of the display panel includes a first stage, a display stage, and a second stage. The driving method of the display panel includes the following steps. A first voltage is started to be provided to the metal pattern at the first time in the first stage, where the first voltage is greater than 0. A first black-state voltage is started to be provided to the data line at the second time in the first stage. A second voltage is stopped to be provided to the metal pattern at the third time in the second stage, where the second voltage is greater than 0. A second black-state voltage is stopped to be provided to the data line at the fourth time in the second stage. The first time is before the second time, and/or the third time is after the fourth time.

Inventors

Dipeng Li
Qi XIAO
Qiang Chen
Ying Sun
JINGXIONG ZHOU

Assignees

Xiamen Tianma Display Technology Co., Ltd.

Dates

Publication Date: 20260512
Application Date: 20240806
Priority Date: 20231008

Claims (20)

1 . A driving method for a display panel, wherein the display panel comprises a substrate, a metal pattern, a pixel circuit, and a light-emitting element; in a thickness direction of the display panel, the metal pattern is disposed between the substrate and the pixel circuit, the metal pattern overlaps an orthographic projection of a channel of at least a portion of transistors in the pixel circuit on the substrate, and the pixel circuit is electrically connected to a data line; a driving process of the display panel comprises a first stage, a display stage, and a second stage, and the display stage is between the first stage and the second stage; and the driving method comprises: starting providing a first voltage to the metal pattern at first time in the first stage, wherein the first voltage is greater than 0; starting providing a first black-state voltage to the data line at second time in the first stage; stopping providing a second voltage to the metal pattern at third time in the second stage, wherein the second voltage is greater than 0; and stopping providing a second black-state voltage to the data line at fourth time in the second stage; wherein at least one of following configurations is satisfied: the first time is before the second time, and the third time is after the fourth time.
2 . The driving method for the display panel of claim 1 , wherein an anode of the light-emitting element is electrically connected to an initialization signal line; and the driving method further comprises: starting providing a first initialization voltage to the initialization signal line at fifth time in the first stage, wherein the first initialization voltage is less than 0; and stopping providing a second initialization signal to the initialization signal line at sixth time in the second stage, wherein the second initialization voltage is less than 0; wherein the fifth time is before the first time, and/or the sixth time is after the third time.
3 . The driving method for the display panel of claim 1 , wherein a time interval between the first time and the second time is t12, and t12≥1/F; and/or a time interval between the third time and the fourth time is t34, and t34≥1/F; wherein F is frame refresh frequency of the display panel.
4 . The driving method for the display panel of claim 1 , wherein a time interval between the first time and the second time is t12, and t12 ≤2/F; and/or a time interval between the third time and the fourth time is t34, and t34 ≤2/F; wherein F is frame refresh frequency of the display panel.
5 . The driving method for the display panel of claim 1 , wherein a time interval between the first time and the second time is t12, a time interval between the third time and the fourth time is t34, and t12=t34.
6 . The driving method for the display panel of claim 2 , wherein a time interval between the first time and the fifth time is t15, and t15≥1/F; and/or a time interval between the third time and the sixth time is t36, and t36≥1/F; wherein F is frame refresh frequency of the display panel.
7 . The driving method for the display panel of claim 2 , wherein a time interval between the first time and the fifth time is t15, and t15≤2/F; and/or a time interval between the third time and the sixth time is t36, and t36≤2/F; wherein F is frame refresh frequency of the display panel.
8 . The driving method for the display panel of claim 2 , wherein a time interval between the first time and the fifth time is t15, a time interval between the third time and the sixth time is t36, and t15=t36.
9 . The driving method for the display panel of claim 1 , wherein the first voltage is equal to the second voltage, and/or the first black-state voltage is equal to the second black-state voltage.
10 . The driving method for the display panel of claim 1 , wherein starting providing the first black-state voltage to the data line at the second time in the first stage comprises: starting providing the first black-state voltage to the data line at the second time in the first stage for a duration t10, wherein 1/F≤t10≤2/F, and F is frame refresh frequency of the display panel; and/or wherein stopping providing the second black-state voltage to the data line at the fourth time in the second stage comprises: stopping providing the second black-state voltage to the data line at the fourth time in the second stage, wherein a duration of providing the second black-state voltage to the data line in the second stage is t40, wherein 1/F≤t40≤2/F.
11 . The driving method for the display panel of claim 1 , wherein the pixel circuit comprises a drive transistor and at least one switch transistor, and the metal pattern overlaps at least an orthographic projection of a channel of the drive transistor on the substrate.
12 . The driving method for the display panel of claim 1 , wherein the pixel circuit is further electrically connected to a first power line, and the first power line and the metal pattern are electrically connected to different signal terminals; and/or wherein the pixel circuit is further electrically connected to the first power line, and the first power line is electrically connected to the metal pattern.
13 . The driving method for the display panel of claim 12 , wherein the light-emitting element is further electrically connected to a second power line; and the driving method comprises: starting providing a first power voltage to the second power line at the first time, wherein the first power voltage is less than 0; and stopping providing a second power voltage to the second power line at the third time, wherein the second power voltage is less than 0.
14 . The driving method for the display panel of claim 13 , wherein the first power voltage is equal to the second power voltage.
15 . The driving method for the display panel of claim 2 , wherein a drive transistor of the pixel circuit is electrically connected to a reset signal line; and the driving method further comprises: starting providing a first reset voltage to the reset signal line at the fifth time, wherein the first reset voltage is less than 0; and stopping providing a second reset voltage to the reset signal line at the sixth time, wherein the second reset voltage is less than 0; or the driving method further comprises: starting providing the first reset voltage to the reset signal line at seventh time in the first stage, wherein the first reset voltage is less than 0; and stopping providing the second reset voltage to the reset signal line at eighth time in the second stage, wherein the second reset voltage is less than 0; wherein the seventh time and the fifth time are different, and/or the eighth time and the sixth time are different.
16 . The driving method for the display panel of claim 1 , wherein a drive transistor of the pixel circuit is electrically connected to a bias adjustment signal line; and the driving method further comprises: starting providing a first bias adjustment voltage to the bias adjustment signal line at the second time in the first stage; and stopping providing a second bias adjustment voltage to the bias adjustment signal line at the fourth time in the second stage.
17 . The driving method for the display panel of claim 1 , wherein the pixel circuit is further electrically connected to a light emission control signal line; and the driving method further comprises: providing a light-emitting non-enable voltage to the light emission control signal line in the first stage and the second stage; and providing alternating light-emitting non-enable voltage and light-emitting enable voltage to the light emission control signal line in the display stage.
18 . The driving method for the display panel of claim 1 , wherein the pixel circuit is further electrically connected to a scan line; and the driving method further comprises: providing an enable voltage to the scan line during at least a portion of time periods of the first stage and the second stage.
19 . A display device, comprising: a display panel, which comprises a substrate, a metal pattern, a pixel circuit, and a light-emitting element; wherein in a thickness direction of the display panel, the metal pattern is disposed between the substrate and the pixel circuit, the metal pattern overlaps an orthographic projection of a channel of at least a portion of transistors in the pixel circuit on the substrate, and the pixel circuit is electrically connected to a data line; and a driving process of the display panel comprises a first stage, a display stage, and a second stage, and the display stage is between the first stage and the second stage; a power drive chip configured to start providing a first voltage to the metal pattern at first time in the first stage and stop providing a second voltage to the metal pattern at third time in the second stage, wherein the first voltage is greater than 0, and the second voltage is greater than 0; and a display drive chip configured to start providing a first black-state voltage to the data line at second time in the first stage and stop providing a second black-state voltage to the data line at fourth time in the second stage; wherein at least one of following configurations is satisfied: the first time is before the second time, and the third time is after the fourth time.
20 . The display device of claim 19 , wherein an anode of the light-emitting element is electrically connected to an initialization signal line; and the power drive chip is further configured to start providing a first initialization voltage to the initialization signal line at fifth time in the first stage and stop providing a second initialization signal to the initialization signal line at sixth time in the second stage, wherein the first initialization voltage is less than 0, and the second initialization voltage is less than 0; wherein the fifth time is before the first time, and/or the sixth time is after the third time.

Description

CROSS-REFERENCE TO RELATED APPLICATION(S) This application claims the priority of a Chinese Patent Application No. 202311290428.X, filed on Oct. 8, 2023, the disclosure of which is incorporated herein by reference in its entirety. TECHNICAL FIELD The present application relates to the field of display technology, in particular, a driving method for a display panel and a display device. BACKGROUND With the continuous development of display technology, users have increasingly higher requirements for the performance of display panels in all aspects. Pixel circuits may be configured in a display panel to drive a light-emitting element for display. A pixel circuit includes multiple transistors that can be used for, for example, writing data and generating drive currents. However, transistors in the pixel circuit are prone to leakage. As a result, screen flickering is likely to occur in the process of powering on and off of the display panel, affecting the user experience. SUMMARY Embodiments of the present application provide a driving method for a display panel and a display device. In a first aspect, embodiments of the present application provide a driving method for a display panel. The display panel includes a substrate, a metal pattern, a pixel circuit, and a light-emitting element. In the direction of the thickness of the display panel, the metal pattern is disposed between the substrate and the pixel circuit, the metal pattern overlaps an orthographic projection of a channel of at least a portion of transistors in the pixel circuit on the substrate, and the pixel circuit is electrically connected to a data line. The driving process of the display panel includes a first stage, a display stage, and a second stage. The display stage is between the first stage and the second stage. The driving method includes the steps described below. A first voltage is started to be provided to the metal pattern at the first time in the first stage, where the first voltage is greater than 0. A first black-state voltage is started to be provided to the data line at the second time in the first stage. A second voltage is stopped to be provided to the metal pattern at the third time in the second stage, where the second voltage is greater than 0. A second black-state voltage is stopped to be provided to the data line at the fourth time in the second stage. The first time is before the second time, and/or the third time is after the fourth time. In a second aspect, embodiments of the present application provide a display device. The display device includes a display panel, a power drive chip, and a display drive chip. The display panel includes a substrate, a metal pattern, a pixel circuit, and a light-emitting element. In the direction of the thickness of the display panel, the metal pattern is disposed between the substrate and the pixel circuit, the metal pattern overlaps an orthographic projection of a channel of at least a portion of transistors in the pixel circuit on the substrate, and the pixel circuit is electrically connected to a data line. The driving process of the display panel includes a first stage, a display stage, and a second stage. The display stage is between the first stage and the second stage. The power drive chip is configured to start providing a first voltage to the metal pattern at the first time in the first stage and stop providing a second voltage to the metal pattern at the third time in the second stage; the first voltage is greater than 0, and the second voltage is greater than 0. The display drive chip is configured to start providing a first black-state voltage to the data line at the second time in the first stage and stop providing a second black-state voltage to the data line at the fourth time in the second stage. The display stage of the display panel is between the first stage and the second stage; the first time is before the second time, and/or the third time is after the fourth time. BRIEF DESCRIPTION OF DRAWINGS Other features, objects, and advantages of the present application are more apparent after a detailed description of non-limiting embodiments with reference to the drawings below is read. The same or similar reference numerals denote the same or similar features. The drawings are not drawn to actual scale. FIG. 1 is a top view illustrating the structure of a display device according to an embodiment of the present application. FIG. 2 is a sectional view illustrating the structure of a display panel according to an embodiment of the present application. FIG. 3 is a schematic diagram illustrating the circuit structure of a pixel circuit in a display panel according to an embodiment of the present application. FIG. 4 is a timing diagram of a display panel according to an embodiment of the present application. FIG. 5 is another timing diagram of the display panel according to an embodiment of the present application. FIG. 6 is another timing diagram of the display panel accordin