CN-121999708-A - Pixel circuit, driving method thereof and display panel

CN121999708ACN 121999708 ACN121999708 ACN 121999708ACN-121999708-A

Abstract

The embodiment of the invention discloses a pixel circuit, a driving method thereof and a display panel, wherein the pixel circuit comprises a driving module, a data writing module, a compensation module, a storage module and a light emitting module, wherein the compensation module is connected between a first control end and a first end of the driving module and is used for carrying out threshold voltage compensation on the driving module in a compensation stage, the data writing module is connected with a second control end of the driving module and is used for transmitting a first voltage to the second control end of the driving module in an initialization stage and transmitting a data voltage to the second control end of the driving module in a data writing stage, the storage module is respectively connected with the first control end and the second control end of the driving module, and the compensation stage is arranged between the initialization stage and the data writing stage corresponding to at least two rows of light emitting modules in one frame period. The technical scheme provided by the embodiment of the invention can reduce the frequency of threshold voltage compensation, increase the time duty ratio of the light-emitting module in the on state, and further reduce the fluctuation depth of brightness.

Inventors

GUO ENQING
GAI CUILI
GUO SHUANG
LU JIANJUN
JIN XIAOYANG

Assignees

北京维信诺科技有限公司

Dates

Publication Date: 20260508
Application Date: 20260320

Claims (10)

1. The pixel circuit is characterized by comprising a driving module, a data writing module, a compensation module, a storage module and a light emitting module; The compensation module is connected between the first control end and the first end of the driving module and is used for carrying out threshold voltage compensation on the driving module in a compensation stage; The data writing module is connected with the second control end of the driving module and is used for transmitting a first voltage to the second control end of the driving module in an initialization stage and transmitting a data voltage to the second control end of the driving module in a data writing stage; The storage module is respectively connected with a first control end and a second control end of the driving module; The light-emitting module is connected with the driving module, and the driving module is used for driving the light-emitting module to emit light in a light-emitting stage; In one frame period, the compensation phase is between the initialization phase and the data writing phase corresponding to at least two rows of the light emitting modules.
2. The pixel circuit according to claim 1, wherein a first end of the light emitting module is connected to a first power line, a second end of the light emitting module is connected to a first end of the driving module, and a second end of the driving module is connected to a second power line; The light emitting module comprises a light emitting diode, the driving module comprises a first transistor, a first pole of the light emitting diode is connected with the first power line, a second pole of the light emitting diode is connected with the first pole of the first transistor, a second pole of the first transistor is connected with the second power line, a first grid electrode of the first transistor is used as a first control end of the driving module, and a second grid electrode of the first transistor is used as a second control end of the driving module; The first power supply voltage transmitted on the first power supply line is greater than the second power supply voltage transmitted on the second power supply line.
3. The pixel circuit of claim 1, wherein the memory module comprises a first memory cell and a second memory cell, the first memory cell is connected between a first control terminal of the driving module and a second power line, the first memory cell is used for storing voltage information associated with a threshold voltage of the driving module, the second memory cell is connected between a second control terminal of the driving module and the second power line, the second memory cell is used for storing a voltage of a second control terminal of the driving module, the first memory cell comprises a first capacitor, and the second memory cell comprises a second capacitor.
4. A pixel circuit according to claim 3, wherein the threshold voltage duration stored on the first memory cell is an integer multiple of the frame period.
5. The pixel circuit according to claim 1, wherein the data writing module is connected between a data line and a second control terminal of the driving module, the control terminal of the data writing module is connected to a scanning signal line, the control terminal of the compensation module is connected to a control signal line, the data line is configured to transmit the first voltage in the initialization phase, and the data voltage in the data writing phase; The scanning signal transmitted on the scanning signal line comprises a first pulse signal and a second pulse signal, at least in a first frame, the end time of the effective level of the first pulse signal is later than the start time of the effective level of the control signal transmitted on the control signal line and earlier than the end time of the effective level of the control signal, and the start time of the effective level of the second pulse signal is later than the end time of the effective level of the control signal.
6. The pixel circuit of claim 1, further comprising an initialization module connected between an initialization signal line and the first terminal of the drive module, the initialization module configured to transmit an initialization voltage on the initialization signal line to the first control terminal of the drive module via the compensation module during the initialization phase; Preferably, the control end of the initialization module and the control end of the data writing module access the same signal.
7. The driving method of the pixel circuit is characterized in that the pixel circuit comprises a driving module, a data writing module, a compensation module, a storage module and a light emitting module, wherein the compensation module is connected between a first control end and a first end of the driving module, and the storage module is respectively connected with the first control end and a second control end of the driving module; the driving method of the pixel circuit comprises the following steps: In an initialization stage, the data writing module is controlled to transmit a first voltage to a second control end of the driving module, and the storage module stores the voltage of the second control end of the driving module; In the compensation stage, controlling the compensation module to perform threshold voltage compensation on the driving module, and storing the voltage of the first control end of the driving module by the storage module; In a data writing stage, controlling the data writing module to transmit data voltage to a second control end of the driving module, and storing the voltage of the second control end of the driving module by the storage module; in the light-emitting stage, controlling the driving module to drive the light-emitting module to emit light; in one frame period, the data writing stage corresponds to at least two rows of the light emitting modules.
8. The method according to claim 7, wherein the first end of the light emitting module is connected to a first power line, the second end of the light emitting module is connected to the first end of the driving module, and the second end of the driving module is connected to a second power line; The driving method of the pixel circuit further includes: in the initialization stage, the initialization module is controlled to transmit an initialization voltage on an initialization signal line to a first control end of the driving module through the compensation module; preferably, in the compensation phase, the compensation module is controlled to compensate the threshold voltage of the driving module, and the storage module stores the voltage of the first control terminal of the driving module, including: And in the compensation stage, a first control end of the driving module is controlled to discharge through the compensation module, the driving module and the second power line until the driving module is turned off, the voltage of the first control end of the driving module is voltage information related to the threshold voltage of the driving module, and the storage module stores the voltage information.
9. A display panel comprising the pixel circuit of any one of claims 1-6.
10. The display panel according to claim 9, further comprising a plurality of scan signal lines and a plurality of control signal lines, wherein the pixel circuit comprises a driving module, a data writing module, a compensation module, a memory module, an initialization module and a light emitting module, wherein the compensation module is connected between a first control terminal and a first terminal of the driving module, the data writing module is connected with a second control terminal of the driving module, the memory module comprises a first memory cell and a second memory cell, the first memory cell is connected between the first control terminal and the second power line of the driving module, the second memory cell is connected between the second control terminal and the second power line of the driving module, the initialization module is connected between the initialization signal line and the first terminal of the driving module, each row of the pixel circuit is connected with one scan signal line and one control signal line, the plurality of scan signal lines are used for transmitting scan signals to the data writing module and the initialization module of the pixel circuit row by row, and the plurality of scan signal lines are used for transmitting all the pixel signals to the pixel circuit at the same time.

Description

Pixel circuit, driving method thereof 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 thereof and a display panel. Background With the rapid development of display technology, display requirements for display panels are increasing. At present, the brightness fluctuation depth of the display panel is large, which is unfavorable for improving the display quality. Disclosure of Invention The embodiment of the invention provides a pixel circuit, a driving method thereof and a display panel, so as to reduce the brightness fluctuation depth of the display panel and improve the display quality. According to an aspect of the present invention, there is provided a pixel circuit, The device comprises a driving module, a data writing module, a compensation module, a storage module and a light emitting module; The compensation module is connected between the first control end and the first end of the driving module and is used for carrying out threshold voltage compensation on the driving module in a compensation stage; The data writing module is connected with the second control end of the driving module and is used for transmitting a first voltage to the second control end of the driving module in an initialization stage and transmitting a data voltage to the second control end of the driving module in a data writing stage; The storage module is respectively connected with a first control end and a second control end of the driving module; The light-emitting module is connected with the driving module, and the driving module is used for driving the light-emitting module to emit light in a light-emitting stage; In one frame period, the compensation phase is between the initialization phase and the data writing phase corresponding to at least two rows of the light emitting modules. Optionally, the first end of the light emitting module is connected with a first power line, the second end of the light emitting module is connected with the first end of the driving module, and the second end of the driving module is connected with a second power line; optionally, the light emitting module includes a light emitting diode, the driving module includes a first transistor, a first pole of the light emitting diode is connected to the first power line, a second pole of the light emitting diode is connected to the first pole of the first transistor, a second pole of the first transistor is connected to the second power line, a first gate of the first transistor is used as a first control end of the driving module, and a second gate of the first transistor is used as a second control end of the driving module; Optionally, the first transistor is an N-type vertical double-gate transistor, the first gate of the first transistor is a top gate, the second gate of the first transistor is a bottom gate, or the first gate of the first transistor is a bottom gate, and the second gate of the first transistor is a top gate; optionally, the first transistor is a metal oxide transistor; Optionally, the first power supply voltage transmitted on the first power supply line is greater than the second power supply voltage transmitted on the second power supply line. Optionally, the storage module includes a first storage unit and a second storage unit, the first storage unit is connected between a first control end of the driving module and a second power line, and the first storage unit is used for storing voltage information associated with a threshold voltage of the driving module; the second storage unit is connected between the second control end of the driving module and the second power line and is used for storing the voltage of the second control end of the driving module; Optionally, the first storage unit includes a first capacitor, the second storage unit includes a second capacitor, a first pole of the first capacitor is connected to the first control end of the driving module, a second pole of the first capacitor is connected to the second power line, a first pole of the second capacitor is connected to the second control end of the driving module, and a second pole of the second capacitor is connected to the second power line. Optionally, the threshold voltage duration stored on the first memory cell is an integer multiple of the frame period. Optionally, the data writing module is connected between a data line and a second control end of the driving module, the control end of the data writing module is connected with a scanning signal line, the control end of the compensation module is connected with a control signal line, the data line is configured to transmit the first voltage in the initialization stage, and transmit the data voltage in the data writing stage; optionally, the first voltage is a direct current voltage; Optionally, the scan signal transmitted on the scan signal line includes a first pulse signal and a