CN-122024641-A - Pixel circuit, driving method of pixel circuit and display panel

CN122024641ACN 122024641 ACN122024641 ACN 122024641ACN-122024641-A

Abstract

The embodiment of the invention discloses a pixel circuit, a driving method of the pixel circuit and a display panel. The pixel circuit comprises a driving module, a compensation module, a first storage module and a second storage module, wherein the driving module is connected with a first node and a light-emitting module, the driving module is connected with a first power end, a first control end of the compensation module is connected with a second node, the compensation module is connected with a first signal wire, a control end of the compensation module is connected with a first scanning wire and used for compensating threshold voltage of the driving module, the first storage module is connected between the first node and the second node and used for storing threshold voltage of the driving module, a second control end of the driving module inputs data voltage, a first scanning signal transmitted by the first scanning wire is a global control signal, and duration of the threshold voltage stored by the first storage module is integral multiple of a frame period. The technical scheme provided by the embodiment reduces the brightness fluctuation depth of the display picture, suppresses screen flicker, and improves the comfort level of a user looking at the screen.

Inventors

GUO ENQING
GAI CUILI
CHENG YUN
GUO SHUANG

Assignees

云谷（固安）科技有限公司

Dates

Publication Date: 20260512
Application Date: 20260317

Claims (10)

1. A pixel circuit, which comprises a pixel circuit and a pixel electrode, characterized by comprising the following steps: The driving module and the light-emitting module are connected to the first node and connected with the first power supply end; The compensation module is connected with the first control end of the driving module and the second node, is connected with the first signal line, and is connected with the first scanning line and used for compensating the threshold voltage of the driving module; The first storage module is connected between the first node and the second node and is used for storing the threshold voltage of the driving module; the first storage module stores the threshold voltage with the duration being an integer multiple of the frame period.
2. The pixel circuit of claim 1, wherein the pixel circuit further comprises: the data writing module is connected with the second control end of the driving module and the third node, the data writing module is connected with a data line, the control end of the data writing module is connected with a second scanning line, and the data writing module is used for transmitting a first initialization voltage to the third node in a resetting stage and transmitting a data voltage to the third node in a data writing stage; The first scanning signal transmitted by the second scanning line is a global control signal in the reset stage, and is a progressive scanning signal in the data writing stage.
3. The pixel circuit of claim 2, wherein the pixel circuit further comprises: A second storage module connected between the third node and the first node, the second storage module being configured to store the data voltage; the compensation module comprises a first switch tube, wherein the first storage module comprises a first capacitor, a first electrode of the first switch tube is connected with the first signal line, a second electrode of the first switch tube and a first end of the first capacitor are connected with a third node, a control electrode of the first switch tube is connected with the first scanning line, and a second end of the first capacitor is connected with a first power supply end; The data writing module comprises a second switch tube, the second storage module comprises a second capacitor, a first electrode of the second switch tube is connected with the data line, a second electrode of the second switch tube and a first end of the second capacitor are connected to a third node, a control electrode of the second switch tube is connected with the second scanning line, and a second end of the second capacitor is connected with the first node.
4. The pixel circuit of claim 2, wherein the pixel circuit further comprises: The system comprises an initialization module, a first scanning line, a second scanning line, a first initialization voltage and a second initialization voltage, wherein the initialization module is connected between an initialization line and an anode of the light-emitting module, and a control end of the initialization module is connected with the second scanning line; the second initialization voltage is equal to the first initialization voltage; Preferably, the initialization module comprises a third switching tube, wherein a first pole of the third switching tube is connected with the initialization line, a second pole of the third switching tube is connected with the anode of the light-emitting module, and a control pole of the third switching tube is connected with the second scanning line; Preferably, the driving module comprises a driving transistor, the light emitting module comprises an organic light emitting diode, a first pole of the driving transistor is connected with the first power end, a second pole of the driving transistor is connected with the first node and an anode of the organic light emitting diode, a cathode of the organic light emitting diode is connected with the second power end, a first control end of the driving transistor and the compensation module are connected with the second node, and a second control end of the driving transistor and the data writing module are connected with the third node.
5. The pixel circuit according to claim 2, wherein, When the first control end is a top gate, the second control end is a bottom gate, or when the first control end is a bottom gate, the second control end is a top gate; The data line is used for transmitting a first initialization voltage in a reset stage and transmitting the data voltage in a data writing stage.
6. A driving method of a pixel circuit, characterized in that the method is performed by the pixel circuit according to any one of claims 1 to 5, the method comprising: In the compensation stage, all compensation modules in the pixel circuit compensate the threshold voltage of a driving module according to a first scanning signal at the same time and store the threshold voltage of the driving module through the first storage module, wherein the duration of the first storage module for storing the threshold voltage is an integral multiple of a frame period; in the data writing stage, the second control end of the driving module inputs data voltage.
7. The method according to claim 6, wherein the compensating means for compensating the threshold voltages of the driving means according to the first scan signal and storing the threshold voltages of the driving means by the first storage means simultaneously in the compensating step comprises: In the compensation stage of the nth frame, all compensation modules in the pixel circuits compensate the threshold voltage of the driving module according to the first scanning signal at the same time and store the threshold voltage of the driving module through the first storage module, wherein n is an integer greater than or equal to 1; in the (n+1) -th to (n+m) -th frames, the threshold voltage stored by the first storage module in the pixel circuit is kept to be compensated for the threshold voltage of the driving module, m is an integer greater than or equal to 1; in the compensation stage of the n+m+1 frame, all compensation modules in the pixel circuits compensate the threshold voltage of the driving module according to the first scanning signal at the same time, and the threshold voltage of the driving module is stored by the first storage module; preferably, in the compensation phase, the first storage modules in all the pixel circuits store the threshold voltages of the driving modules at the same time, and the duration of storing the threshold voltages is m times of the frame period.
8. The method of driving a pixel circuit according to claim 6, wherein the driving module has a second control terminal for inputting a data voltage during the data writing stage, comprising: The data writing module of the pixel circuit transmits data voltage to a second control end of the driving module row by row according to a second scanning signal, wherein the second scanning signal is a progressive scanning signal in the data writing stage; In a data writing stage, a second storage module in the pixel circuit stores the data voltage of the driving module row by row; Preferably, in the compensation frame, all the pixel circuits include a compensation phase and a data writing phase, and the compensation phase is set in an idle phase of the data writing phase in all the pixel circuits; at least one write frame is included between two adjacent compensation frames, where all of the pixel circuits do not include a compensation phase.
9. The method according to claim 6, wherein in the compensation phase, the compensation modules in all the pixel circuits compensate the threshold voltages of the driving modules according to the first scan signals at the same time, and before storing the threshold voltages of the driving modules by the first storage module, the method further comprises: In a resetting stage, all the data writing modules in the pixel circuits initialize a second control end of the driving module through a first initialization voltage transmitted by a data line according to a second scanning signal; and initializing anodes of the light emitting modules by all the initializing modules in the pixel circuits according to a second initializing voltage transmitted by the second scanning signal through an initializing line at the same time in the resetting stage, wherein the second scanning signal is a global control signal in the resetting stage, and the first initializing voltage is equal to the second initializing voltage.
10. A display panel comprising a light emitting module and at least one pixel circuit according to any one of claims 1 to 5; Preferably, the display panel comprises a compensation frame and a writing frame, wherein in the compensation frame, all the pixel circuits comprise a compensation stage and a data writing stage, and the compensation stage is arranged in an idle stage of the data writing stage in all the pixel circuits; In the compensation frame, the compensation phase is arranged before the data writing phase in the pixel circuits of the first row or after the data writing phase in the pixel circuits of the last row; At least one of the write frames is included between two adjacent compensation frames.

Description

Pixel circuit, driving method of pixel circuit and display panel Technical Field The embodiment of the invention relates to the technical field of display, in particular to a pixel circuit, a driving method of the pixel circuit and a display panel. Background With the development of display technology, the requirements of people on the display panel are increasing. The display picture of the existing display panel has overlarge brightness fluctuation depth, so that the screen flickers, and the comfort level of watching the screen by a user is affected. Disclosure of Invention The embodiment of the invention provides a pixel circuit, a driving method of the pixel circuit and a display panel, which are used for solving the problem that a display picture of the display panel has overlarge brightness fluctuation depth, so that a screen flickers and the comfort level of a user watching the screen is affected. In order to realize the technical problems, the invention adopts the following technical scheme: the embodiment of the invention provides a pixel circuit, which comprises: The driving module is connected with the light-emitting module, the first node and the first power supply end; The compensation module is connected with the first control end of the driving module and the second node, the compensation module is connected with the first signal line, and the control end of the compensation module is connected with the first scanning line and is used for compensating the threshold voltage of the driving module; The first storage module is connected between a first node and a second node and is used for storing the threshold voltage of the driving module; the first scanning signal transmitted by the first scanning line is a global control signal, and the duration of the first storage module for storing the threshold voltage is an integral multiple of the frame period. Optionally, the pixel circuit further includes: The data writing module is connected with the second control end of the driving module and the third node, the data writing module is connected with the data line, the control end of the data writing module is connected with the second scanning line, and the data writing module is used for transmitting a first initialization voltage to the third node in a resetting stage and transmitting a data voltage to the third node in a data writing stage; The first scanning signal transmitted by the first scanning line is a global control signal in a reset stage and is a progressive scanning signal in a data writing stage. Optionally, the pixel circuit further includes: the second storage module is connected between the third node and the first node and is used for storing data voltages; Preferably, the compensation module comprises a first switch tube, the first storage module comprises a first capacitor, a first electrode of the first switch tube is connected with a first signal line, a second electrode of the first switch tube and a first end of the first capacitor are connected with a third node, a control electrode of the first switch tube is connected with a first scanning line, and a second end of the first capacitor is connected with a first power supply end; Preferably, the data writing module comprises a second switch tube, the second storage module comprises a second capacitor, a first electrode of the second switch tube is connected with the data line, a second electrode of the second switch tube and a first end of the second capacitor are connected to a third node, a control electrode of the second switch tube is connected with a second scanning line, and a second end of the second capacitor is connected with the first node. Optionally, the pixel circuit further includes: The system comprises an initialization module, a first scanning line, a second scanning line, a first initialization voltage and a second initialization voltage, wherein the initialization module is connected between an initialization line and an anode of the light-emitting module; Preferably, the second initialization voltage is equal to the first initialization voltage; Preferably, the initialization module comprises a third switching tube, wherein a first electrode of the third switching tube is connected with the initialization line, a second electrode of the third switching tube is connected with an anode of the light-emitting module, and a control electrode of the third switching tube is connected with the second scanning line; Preferably, the driving module comprises a driving transistor, the light emitting module comprises an organic light emitting diode, a first pole of the driving transistor is connected with a first power end, a second pole of the driving transistor is connected with a first node and an anode of the organic light emitting diode, a cathode of the organic light emitting diode is connected with a second power end, a first control end of the driving transistor is connected with the compensation module and