CN-121999707-A - Pixel circuit, driving method thereof and display panel

CN121999707ACN 121999707 ACN121999707 ACN 121999707ACN-121999707-A

Abstract

The application discloses a pixel circuit, a driving method thereof and a display panel, wherein the pixel circuit comprises a driving module, a threshold compensation module, a storage module and a reset module, wherein the driving module is used for providing driving current for a light emitting module, the threshold compensation module is electrically connected between a second end and a control end of the driving module and used for transmitting voltage containing threshold voltage information to the control end of the driving module in a first stage, the storage module is electrically connected between the first end and the control end of the driving module and used for storing the voltage of the control end of the driving module, the first end of the reset module is connected with a reset voltage signal, and the second end of the reset module is electrically connected with the first end of the driving module and the first end of the light emitting module. In the application, the threshold compensation stage and the grid reset stage of the driving transistor are performed simultaneously, the time adjustable range of the threshold compensation stage is flexible, and the working efficiency of the pixel circuit is improved.

Inventors

JIN XIAOYANG
GAI CUILI
GUO ENQING
LU JIANJUN
GUO SHUANG
CHENG YUN

Assignees

云谷（固安）科技有限公司

Dates

Publication Date: 20260508
Application Date: 20260313

Claims (10)

1. A pixel circuit, which comprises a pixel circuit and a pixel electrode, characterized by comprising the following steps: a driving module for providing a driving current to the light emitting module; The threshold compensation module is electrically connected between the second end and the control end of the driving module and is used for transmitting voltage containing threshold voltage information to the control end of the driving module in a first stage; The storage module is electrically connected between the first end and the control end of the driving module and used for storing the voltage of the control end of the driving module; The first end of the reset module is connected with a reset voltage signal, and the second end of the reset module is electrically connected with the first end of the driving module and the first end of the light emitting module and is used for resetting the control end of the driving module, the first end of the driving module and the first end of the light emitting module in the first stage.
2. The pixel circuit according to claim 1, wherein a control end of the reset module is connected to a first scan signal, a control end of the threshold compensation module is connected to a second scan signal, and a pulse width of an active level in the first scan signal covers a pulse width of an active level in the second scan signal; preferably, the reset module includes a fourth transistor, a first pole of the fourth transistor is connected to the reset voltage signal, a second pole of the fourth transistor is electrically connected to the first end of the driving module and the first end of the light emitting module, and a gate of the fourth transistor is connected to the first scan signal; Preferably, the threshold compensation module includes a sixth transistor electrically connected between the second terminal and the control terminal of the driving module, and a gate of the sixth transistor is connected to the second scan signal; Preferably, in one frame, the start time of the active level in the first scan signal is the same as the start time of the active level in the second scan signal.
3. The pixel circuit of claim 1, further comprising a data writing module for writing a voltage containing data voltage information to a control terminal of the driving module in a second phase; preferably, in one frame, the first stage precedes the second stage; Preferably, the duration of the first stage is longer than the duration of the second stage.
4. A pixel circuit according to claim 3, wherein the data writing module comprises a data writing unit, an initializing unit and a coupling unit; The first end of the data writing unit is connected with a data voltage, the second end of the data writing unit is electrically connected with the first end of the coupling unit, the control end of the data writing unit is connected with a third scanning signal, the first end of the initializing unit is connected with a reference voltage, the second end of the initializing unit is electrically connected with the first end of the coupling unit, the control end of the initializing unit is connected with a second light-emitting control signal, and the second end of the coupling unit is used as the output end of the data writing module; Preferably, the data writing unit includes a second transistor, a first pole of the second transistor is used as a first end of the data writing unit, a second pole of the second transistor is used as a second end of the data writing unit, and a gate of the second transistor is used as a control end of the data writing unit; Preferably, the initializing unit includes a third transistor, a first pole of the third transistor is used as a first end of the initializing unit, a second pole of the third transistor is used as a second end of the initializing unit, and a gate of the third transistor is used as a control end of the initializing unit; preferably, the coupling unit includes a second capacitor, a first pole of the second capacitor being a first end of the coupling unit, and a second pole of the second capacitor being a second end of the coupling unit; Preferably, the active level in the third scan signal is located in the second stage, the pulse width of the active level in the first scan signal covers the pulse width of the active level in the third scan signal, and in one frame, the end time of the active level in the first scan signal is later than the end time of the active level in the third scan signal; Preferably, in one frame, the end time of the active level in the first scanning signal is the same as the end time of the active level in the third scanning signal; Preferably, the pulse width of the active level in the third scan signal does not overlap with the pulse width of the active level in the second light emission control signal, and the pulse width of the inactive level in the second light emission control signal covers the pulse width of the active level in the third scan signal; Preferably, in one frame, the end time of the inactive level in the second light emission control signal is later than the end time of the active level in the first scan signal; preferably, the reference voltage is a constant voltage.
5. A pixel circuit according to claim 3, further comprising a transmission module, wherein a first end of the transmission module is electrically connected to the output end of the data writing module, a second end of the transmission module is electrically connected to the control end of the driving module, and the control end of the transmission module is connected to the first scanning signal, and is configured to transmit the voltage containing the data voltage information output by the data writing module to the control end of the driving module in the second stage; Preferably, the transmission module includes a fifth transistor, a first pole of the fifth transistor is used as a first end of the transmission module, a second pole of the fifth transistor is used as a second end of the transmission module, and a gate of the fifth transistor is used as a control end of the transmission module.
6. The pixel circuit of claim 1, further comprising a first light emission control module and a second light emission control module; The first end of the first light-emitting control module is connected with a first power supply voltage, the second end of the first light-emitting control module is electrically connected with the second end of the driving module, and the control end of the first light-emitting control module is connected with a first light-emitting control signal; the first end of the second light-emitting control module is electrically connected with the first end of the driving module, the second end of the second light-emitting control module is electrically connected with the first end of the light-emitting module, and the control end of the second light-emitting control module is connected with a second light-emitting control signal; The first light-emitting control module and the second light-emitting control module are used for being conducted simultaneously in a third stage so that the light-emitting modules emit light; Preferably, the storage module is electrically connected between the control end of the driving module and the second end of the second light-emitting control module, and the second end of the reset module is electrically connected with the second end of the second light-emitting control module; Preferably, the first light emitting control module includes a seventh transistor, a first pole of the seventh transistor is used as a first end of the first light emitting control module, a second pole of the seventh transistor is used as a second end of the first light emitting control module, and a gate of the seventh transistor is used as a control end of the first light emitting control module; preferably, the second light emitting control module includes an eighth transistor, a first pole of the eighth transistor is used as a first end of the second light emitting control module, a second pole of the eighth transistor is used as a second end of the second light emitting control module, and a gate of the eighth transistor is used as a control end of the second light emitting control module; Preferably, the pulse width of the inactive level in the first light emission control signal covers the pulse width of the inactive level in the second light emission control signal.
7. The pixel circuit of claim 1, wherein the drive module comprises a first transistor having a first pole as a first terminal of the drive module, a second pole as a second terminal of the drive module, and a gate as a control terminal of the drive module; the storage module comprises a first capacitor, and the first capacitor is electrically connected between a first end and a control end of the driving module; the second end of the light emitting module is connected with a second power supply voltage, the light emitting module comprises a light emitting diode, a first pole of the light emitting diode is used as the first end of the light emitting module, and a second pole of the light emitting diode is used as the second end of the light emitting module.
8. A driving method of a pixel circuit for driving the pixel circuit according to any one of claims 1 to 7, comprising: The first stage, the control threshold compensation module and the reset module are conducted simultaneously, and the voltage containing threshold voltage information is transmitted to the control end of the driving module while the control end of the driving module, the first end of the driving module and the first end of the light emitting module are reset; The second stage, the data writing module is controlled to be conducted, and the voltage containing the data voltage information is written into the control end of the driving module; and in the third stage, the driving module generates driving current according to the voltage of the control end of the driving module so as to drive the light emitting module to emit light.
9. The driving method according to claim 8, wherein the reset module is turned on in response to a first scan signal, and the threshold compensation module is turned on in response to a second scan signal, and a pulse width of an active level in the first scan signal covers a pulse width of an active level in the second scan signal; Preferably, in one frame, the start time of the active level in the first scan signal is the same as the start time of the active level in the second scan signal.
10. A display panel comprising a pixel circuit as claimed in any one of claims 1-7.

Description

Pixel circuit, driving method thereof and display panel Technical Field The present invention relates to the field of display technologies, and in particular, to a pixel circuit, a driving method thereof, and a display panel. Background The N-type IGZO TFT (Indium Gallium Zinc Oxide, indium gallium zinc oxide; thin Film Transistor, thin film transistor) has the advantages of low leakage current, low process cost and the like, and is favorable for the refresh rate of low-medium-large-size screens. However, the conventional IGZO TFT may cause problems such as poor brightness uniformity, afterimage, smear, etc. in the pixel. Disclosure of Invention In view of the above, it is necessary to provide a pixel circuit, a driving method thereof, and a display panel. One aspect provides a pixel circuit comprising: a driving module for providing a driving current to the light emitting module; The threshold compensation module is electrically connected between the second end and the control end of the driving module and is used for transmitting voltage containing threshold voltage information to the control end of the driving module in a first stage; The storage module is electrically connected between the first end and the control end of the driving module and used for storing the voltage of the control end of the driving module; The first end of the reset module is connected with a reset voltage signal, and the second end of the reset module is electrically connected with the first end of the driving module and the first end of the light emitting module and is used for resetting the control end of the driving module, the first end of the driving module and the first end of the light emitting module in the first stage. In one embodiment, a control end of the reset module is connected with a first scanning signal, a control end of the threshold compensation module is connected with a second scanning signal, and a pulse width of an effective level in the first scanning signal covers a pulse width of the effective level in the second scanning signal; in one embodiment, the reset module includes a fourth transistor, a first pole of the fourth transistor is connected to the reset voltage signal, a second pole of the fourth transistor is electrically connected to the first end of the driving module and the first end of the light emitting module, and a gate of the fourth transistor is connected to the first scan signal; in one embodiment, the threshold compensation module includes a sixth transistor electrically connected between the second terminal and the control terminal of the driving module, and a gate of the sixth transistor is connected to the second scan signal; In one embodiment, the start time of the active level in the first scan signal is the same as the start time of the active level in the second scan signal in one frame. In one embodiment, the device further comprises a data writing module, wherein the data writing module is used for writing a voltage containing data voltage information to a control end of the driving module in a second stage; in one embodiment, the first phase precedes the second phase in a frame; In one embodiment, the duration of the first phase is greater than the duration of the second phase. In one embodiment, the data writing module comprises a data writing unit, an initializing unit and a coupling unit; The first end of the data writing unit is connected with a data voltage, the second end of the data writing unit is electrically connected with the first end of the coupling unit, the control end of the data writing unit is connected with a third scanning signal, the first end of the initializing unit is connected with a reference voltage, the second end of the initializing unit is electrically connected with the first end of the coupling unit, the control end of the initializing unit is connected with a second light-emitting control signal, and the second end of the coupling unit is used as the output end of the data writing module; In one embodiment, the data writing unit includes a second transistor, a first pole of the second transistor is used as a first end of the data writing unit, a second pole of the second transistor is used as a second end of the data writing unit, and a gate of the second transistor is used as a control end of the data writing unit; In one embodiment, the initializing unit includes a third transistor, a first pole of the third transistor is used as a first end of the initializing unit, a second pole of the third transistor is used as a second end of the initializing unit, and a gate of the third transistor is used as a control end of the initializing unit; In one embodiment, the coupling unit comprises a second capacitor, a first pole of the second capacitor being the first end of the coupling unit, and a second pole of the second capacitor being the second end of the coupling unit; In one embodiment, the active level in the third scan signal is in the second