CN-117059026-B - Display panel and display device

CN117059026BCN 117059026 BCN117059026 BCN 117059026BCN-117059026-B

Abstract

The invention relates to the technical field of display and discloses a display panel and a display device, wherein the display panel comprises a sub-pixel, a display panel and a display panel, wherein the sub-pixel comprises a pixel circuit and a light-emitting element; the pixel circuit comprises a driving module, a switching module and a light-emitting control module, wherein the working process of the pixel circuit comprises a first stage and a second stage in the period of displaying a picture in one frame of the display panel, the first stage comprises a first light-emitting stage and a first non-light-emitting stage, the second stage comprises a second light-emitting stage and a second non-light-emitting stage, the second non-light-emitting stage comprises a first bias compensation stage, the switching module is conducted in the first bias compensation stage, bias compensation voltage is transmitted by a first signal end, and the duty ratio of a light-emitting control signal in the first stage is different from that of a light-emitting control signal in the second stage. The invention effectively improves the problem of picture flickering when the display panel is displayed in the prior art.

Inventors

GAO YANA
HUANG GAOJUN
ZHOU XINGYAO

Assignees

厦门天马显示科技有限公司

Dates

Publication Date: 20260512
Application Date: 20230808

Claims (10)

1. A display panel, comprising: A substrate base; The sub-pixels are arranged on one side of the substrate and comprise pixel circuits and light-emitting elements; The pixel circuit comprises a driving module, a switch module and a light-emitting control module; the first end of the switch module is connected with the first signal end, and the second end of the switch module is electrically connected with the first end of the driving module; the light-emitting control module is connected between the first power supply signal end and the light-emitting element, the control end of the light-emitting control module is connected with the light-emitting control signal end, and the light-emitting control signal end is used for transmitting a light-emitting control signal; In the time of one frame of display picture of the display panel, the working process of the pixel circuit comprises a plurality of first phases and a plurality of second phases, the first phases and the second phases are alternately arranged, and the duration of the first phases is the same as the duration of the second phases; The first stage comprises a first light-emitting stage and a first non-light-emitting stage, wherein in the first stage, the switch module is closed, in the first light-emitting stage, the light-emitting control module is conducted, and in the first non-light-emitting stage, the light-emitting control module is closed; the second stage comprises a second light-emitting stage and a second non-light-emitting stage, wherein in the second light-emitting stage, the light-emitting control module is conducted, and in the second non-light-emitting stage, the light-emitting control module is turned off; The second non-light-emitting stage comprises a first bias compensation stage, wherein in the first bias compensation stage, the switch module is conducted, and the first signal end transmits bias compensation voltage; The duty ratio of the light emission control signal in the first phase is different from the duty ratio thereof in the second phase.
2. The display panel of claim 1, wherein the display panel comprises, The driving module comprises a driving transistor, the driving transistor is a P-type transistor, and the first end of the switch module is electrically connected with the source electrode of the driving transistor; the bias compensation voltage is a high level voltage; The duty cycle of the light emission control signal in the first phase is smaller than that in the second phase.
3. The display panel of claim 1, wherein the display panel comprises, The driving module comprises a driving transistor, the driving transistor is a P-type transistor, and the first end of the switch module is electrically connected with the source electrode of the driving transistor; the bias compensation voltage is a low level voltage; The duty cycle of the light emission control signal in the first phase is greater than that in the second phase.
4. The display panel of claim 2, wherein the display panel comprises, The pixel circuit further comprises a data writing module, wherein a first end of the data writing module is connected with a data voltage end, a second end of the data writing module is electrically connected with a source electrode of the driving transistor, and the data voltage end is used for transmitting data voltage; The working state of the pixel circuit comprises a first mode and a second mode, wherein in the first mode, the voltage value of the data voltage is V1, and in the second mode, the voltage value of the data voltage is V2, wherein V1 is smaller than V2; in the first mode, the duty ratio of the light emitting control signal in the first stage is A1, and in the second mode, the duty ratio of the light emitting control signal in the first stage is A2, wherein A1< A2.
5. The display panel of claim 4, wherein the display panel comprises, The |v1-v2| is positively correlated with |a1-a2|.
6. The display panel of claim 2, wherein the display panel comprises, The pixel circuit further comprises a data writing module, wherein a first end of the data writing module is connected with a data voltage end, a second end of the data writing module is electrically connected with a source electrode of the driving transistor, and the data voltage end is used for transmitting data voltage; in the time of one frame of display picture of the display panel, the working process of the pixel circuit further comprises a third stage, and a first stage is arranged between the third stage and a first stage and the second stage; The third stage comprises a third non-light-emitting stage and a third light-emitting stage which are sequentially arranged, the third non-light-emitting stage comprises a data writing stage, and in the data writing stage, the data writing module is conducted to write the data voltage into the driving module; in the first light-emitting stage, the second light-emitting stage and the third light-emitting stage, the light-emitting control module is conducted, and the first power supply signal end writes a first power supply signal into the driving transistor; in the same frame of display frame time of the display panel, the duration of the second lighting stage is A', the duration of the first lighting stage is A, wherein, VPVDD is the voltage value of the first power supply signal, vdata is the voltage value of the data voltage, and Δvth is the threshold voltage of the driving transistor.
7. The display panel of claim 6, wherein the display panel comprises, The third non-light-emitting stage further comprises a second bias compensation stage and a reset stage, wherein the second bias compensation stage is positioned after the data writing stage, and the switch module is conducted to write the bias compensation voltage into the driving module in the second bias compensation stage; the reset phase is located before the data writing phase, and in the reset phase, the switch module is conducted to write the bias compensation voltage into the driving module.
8. The display panel of claim 7, wherein the display panel comprises, The duty cycle of the light emission control signal in the third phase is greater than that in the first phase.
9. The display panel of claim 7, wherein the display panel comprises, The duty cycle of the light emission control signal in a first one of the first phases is greater than the duty cycle of the light emission control signal in a second one of the first phases.
10. A display device, characterized in that the display device comprises a display panel according to any one of claims 1-9.

Description

Display panel and display device Technical Field The present invention relates to the field of display technologies, and more particularly, to a display panel and a display device. Background The pixel circuit provides a driving current required for display to the light emitting element of the display device and controls whether the light emitting element enters a light emitting stage, so that the pixel circuit becomes an indispensable element in most display devices. However, as the service time increases, the internal characteristics of the driving transistor in the pixel circuit change slowly, so that the threshold voltage of the driving transistor shifts, thereby affecting the driving current generated by the driving transistor, further ensuring that the display effect of the display device is not ideal and the phenomenon of flicker of a picture is easy to occur. Disclosure of Invention In view of the above, the present invention provides a display panel and a display device to improve the flicker problem of the display panel in the prior art. The invention provides a display panel, which comprises a substrate, sub-pixels arranged in an array on one side of the substrate, wherein each sub-pixel comprises a pixel circuit and a light emitting element, each pixel circuit comprises a driving module, a switching module and a light emitting control module, a first end of each switching module is connected with a first signal end, a second end of each switching module is electrically connected with a first end of the driving module, the light emitting control module is connected between a first power signal end and the light emitting element, a control end of each light emitting control module is connected with a light emitting control signal end, the light emitting control signal end is used for transmitting light emitting control signals, in the time of a frame display picture of the display panel, the working process of each pixel circuit comprises a plurality of first phases and a plurality of second phases, the first phases and the second phases are alternately arranged, the duration of the first phases is identical to that of the second phases, each first phase comprises a first light emitting phase and a first non-light emitting phase, the switching module is closed in the first phases, the light emitting control module is conducted in the first light emitting phases, the first non-light emitting phases, the light emitting control module is closed, each second phase comprises a second light emitting phase and a second non-light emitting phase, in the second light emitting phase is conducted in the second phases, the second light emitting control phases, the light emitting control module is conducted in the second phases, the second phases are not light emitting phases, the light emitting control module is in the second phases, the second phases are in the second phases are different in the first duty ratio, and the first phase and second phase and are in the first phase and different in the first duty ratio and are in the first phase and second phase and different. Based on the same thought, the invention also provides a display device which comprises the display panel provided by the invention. Compared with the prior art, the display panel and the display device provided by the invention have the advantages that at least the following effects are realized: In the display panel provided by the invention, the duty ratio of the light-emitting control signal in the first stage is different from that in the second stage. The duration of the first stage is the same as the duration of the second stage, namely the duration of the first lighting stage in the first stage is different from the duration of the second lighting stage in the second stage, so that the phenomenon that the brightness of a display screen of a display panel is different from the brightness of the display screen of the display panel in the second stage due to the fact that a driving transistor is not biased in the first stage and is biased in the first bias compensation stage in the second stage is effectively relieved, the brightness of the display screen of the display panel in the first stage tends to be the same as the brightness of the display screen of the display panel in the second stage in one frame of picture time of the display panel, screen flickering is effectively improved, and visual experience is improved. Of course, it is not necessary for any one product to practice the invention to achieve all of the technical effects described above at the same time. Other features of the present invention and its advantages will become apparent from the following detailed description of exemplary embodiments of the invention, which proceeds with reference to the accompanying drawings. Drawings The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and t