WO2023035613A1 - 像素电路及其驱动方法、显示面板 - Google Patents
像素电路及其驱动方法、显示面板 Download PDFInfo
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Definitions
- Embodiments of the present application provide a pixel circuit, a driving method thereof, and a display panel, so as to improve the uniformity of display brightness.
- the first lighting control module is connected between the first power supply and the first end of the driving module, and is configured to transmit the voltage provided by the first power supply to the first end of the driving module after being turned on;
- the pixel circuit provided by the embodiment of the present application can improve the uniformity of display brightness by changing the connection relationship of the circuit.
- the pixel circuit includes an initialization module, a first storage module, a second storage module, a driving module, a data writing module, a first light emitting control module and a light emitting module, and the first light emitting control module is connected to the first power supply and the first light emitting module of the driving module.
- the data writing module is connected between the control terminal of the driving module and the data line
- the light-emitting module is connected between the second terminal of the driving module and the second power supply
- the initialization module is used to control the driving module during the initialization stage.
- the initialization of the control terminal of the driving module and the writing of the data voltage are respectively implemented through two independent paths, and threshold compensation is performed before writing the data voltage to the control terminal of the driving module. It is precisely because the initialization of the control terminal of the drive module and the writing of data voltage are realized through different paths, and the initialization voltage is continuously written to the control terminal of the drive module during the compensation phase, so that the compensation phase and the data writing phase do not affect each other, thus Makes the compensation time adjustable.
- FIG. 3 is a schematic structural diagram of another pixel circuit provided by an embodiment of the present application.
- FIG. 4 is a schematic structural diagram of another pixel circuit provided by an embodiment of the present application.
- FIG. 8 is a schematic structural diagram of another pixel circuit provided by an embodiment of the present application.
- FIG. 9 is a schematic structural diagram of another pixel circuit provided by an embodiment of the present application.
- the pixel circuit provided by the embodiment of the present application can improve the uniformity of display brightness by changing the connection relationship of the circuit.
- the pixel circuit includes an initialization module, a first storage module, a second storage module, a driving module, a data writing module, a first light emitting control module and a light emitting module, and the first light emitting control module is connected to the first power supply and the first light emitting module of the driving module.
- the data writing module is connected between the control terminal of the driving module and the data line
- the light-emitting module is connected between the second terminal of the driving module and the second power supply
- the initialization module is set to control the driving module during the initialization stage.
- the initialization of the control terminal of the driving module 140 and the initialization of the light emitting module 170 may be implemented through two different paths.
- Fig. 2 is a schematic structural diagram of another pixel circuit provided by the embodiment of the present application
- Fig. 3 is a schematic structural diagram of another pixel circuit provided by the embodiment of the present application.
- the initialization module 110 includes a first initialization module 111 and a second initialization module 112 .
- the control terminal of the data writing module 150 is connected to the second scanning line S2 , the first terminal of the data writing module 150 is connected to the data line Data, and the second terminal of the data writing module 150 is connected to the control terminal of the driving module 140 .
- the control end of the second initialization module 112 is connected to the third scanning line S3, the first end of the second initialization module 112 is connected to the second initialization signal line Reset2, and the second end of the second initialization module 112 is connected to the first end of the light emitting module 170 .
- the gate of the third transistor T3 is connected to the first scanning line S1, the first pole of the third transistor T3 is connected to the first initialization signal line Reset1, the second pole of the third transistor T3 is connected to the gate of the first transistor T1,
- the first pole of the first transistor T1 is connected to the second pole of the fifth transistor T5, the first pole of the fifth transistor T5 is connected to the first power supply VDD, the gate of the fifth transistor T5 is connected to the light emission control signal line EM, and the first
- the second pole of the transistor T1 is connected to the first pole of the light emitting diode D1, and the second pole of the light emitting diode D2 is connected to the second power supply VSS.
- the gate of the second transistor T2 is connected to the second scanning line S2, the first pole of the second transistor T2 is connected to the data line Data, the second pole of the second transistor T2 is connected to the gate of the first transistor T1; the fourth transistor The gate of T4 is connected to the third scanning line S3, the first electrode of the fourth transistor T4 is connected to the second initialization signal line Reset2, and the second electrode of the fourth transistor T4 is connected to the second electrode of the first transistor T1.
- the signal output by the first scan line S1 is at high level
- the signal output by the second scan line S2 is at low level
- the signal output by the third scan line S3 is at high level
- the signal output by the light emission control signal line EM is at a high level, therefore, the third transistor T3 , the fourth transistor T4 and the fifth transistor T5 are turned on, and the second transistor T2 is turned off.
- the data writing module 150 writes the data voltage Vdata on the data line Data into the control terminal of the driving module 140 .
- the compensation phase since the first storage module 120 has stored the threshold voltage of the driving module 140, after writing the data voltage Vdata to the control terminal of the driving module 140, the voltage stored by the first storage module 120 is consistent with the data voltage Vdata and the threshold voltage voltages are linked.
- the first scanning line S1 outputs a high-level first scanning signal
- the second scanning line S2 outputs a low-level second scanning signal
- the third scanning line S3 outputs a high-level third scanning signal
- the luminescence control signal line EM outputs a low-level or high-level luminescence control signal, respectively controls the first initialization module 111 and the second initialization module 112 to turn on, controls the data writing module 150 to turn off, and controls the first luminescence control module 160 is turned on or off.
- the first initialization voltage V0 output by the first initialization signal line Reset1 is written into the gate of the first transistor T1 and the first terminal of the first capacitor Cst1 to initialize the potential of the gate of the first transistor T1 .
- the second initialization voltage Vref is lower than the first initialization voltage V0, and the first initialization voltage V0 is lower than the turn-on voltage of the LED D1, so as to ensure that the LED D1 does not emit light during the initialization phase.
- the first transistor T1 is an N-type transistor, setting the second initialization voltage Vref to be lower than the first initialization voltage V0 can make the voltage difference between the gate and the second electrode of the first transistor T1 (that is, the voltage difference between the first transistor T1
- the gate-source voltage of T1 is a positive voltage, which is favorable for turning on the first transistor T1.
- the first scan line S1 outputs a high-level first scan signal
- the second scan line S2 outputs a low-level second scan signal
- the third scan line S3 outputs a low-level third scan signal
- the light emission control signal line EM outputs a high level light emission control signal, respectively controls the first initialization module 111 and the first light emission control module 160 to be turned on, and controls the data writing module 150 and the second initialization module 112 to be turned off.
- the driving module 140 is in the on state, and the first power supply VDD charges the third node N3, so that the voltage of the third node N3 gradually increases from Vref.
- the potential of the control terminal of the driving module 140 is always the first initialization voltage V0. Therefore, when the voltage of the third node N3 rises to V0-Vth, the first transistor T1 is turned off.
- Vth is the threshold voltage of the first transistor T1.
- the first scan line S1 outputs a low-level first scan signal
- the second scan line S2 outputs a high-level second scan signal
- the third scan line S3 outputs a low-level third scan signal.
- the light emission control signal line EM outputs a low level light emission control signal, respectively controls the data writing module 150 to turn on, and controls the first initialization module 111, the second initialization module 112 and the first light emission control module 160 to turn off.
- the data voltage Vdata on the data line Data is written into the gate of the first transistor T1 through the second transistor T2.
- the voltage change at both ends of the first capacitor Cst1 is the same (charge conservation), so , the voltage variation Vdata-V0 of the first node N1 is coupled to the third node N3 through the first capacitor Cst1, since the third node N3 is connected between the first capacitor Cst1 and the second capacitor Cst2, the voltage of the third node N3
- the capacitance of the capacitor Cst1, c2 is the capacitance of the second capacitor Cst2.
- the first scan line S1, the second scan line S2, the third scan line S3 and the light emission control signal line EM are respectively connected to the gate drive circuit
- the data line Data is connected to the data drive circuit or the display drive chip, That is, the light emission control signal, the first scan signal, the second scan signal and the third scan signal can be respectively output by the gate drive circuit, and the data signal can be output by the data drive circuit or the display drive chip.
- the initialization module 110 includes a first initialization module 111 and a second initialization module 112; the first initialization module 111 is connected between the control terminal of the drive module 140 and the first initialization signal line Reset1, The second initialization module 112 is connected between the first terminal of the light emitting module 170 and the second initialization signal line Reset2.
- the first initialization module 111 and the second initialization module 112 are controlled to be turned on, and the data writing module 150 and the first lighting control module 160 are controlled to be turned off; in the data writing phase t3, the control The data writing module 150 is turned on, and the first initialization module 111 , the second initialization module 112 and the first lighting control module 160 are controlled to be turned off.
- the first light-emitting control module 160 is controlled to be turned on, and the first initialization module 111 , the second initialization module 112 and the data writing module 150 are controlled to be turned off.
- the embodiment of the present application also provides a display panel, the display panel includes the pixel circuit provided in any embodiment of the present application, so the display panel provided in the embodiment of the present application also has the advantages described in any of the above embodiments. Effect.
- Fig. 14 is a schematic structural diagram of a display panel provided by the embodiment of the present application. Referring to Fig. 14, the display panel can be the panel of the mobile phone shown in Fig. 14, or any panel of an electronic product with a display function, including but not Limited to the following categories: TVs, notebook computers, desktop monitors, tablet computers, digital cameras, smart bracelets, smart glasses, vehicle displays, medical equipment, industrial control equipment, touch interactive terminals, etc., the embodiment of this application does not make special limited.
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Abstract
Description
Claims (18)
- 一种像素电路,包括初始化模块、第一存储模块、第二存储模块、驱动模块、数据写入模块、第一发光控制模块和发光模块;所述第一发光控制模块连接于第一电源和所述驱动模块的第一端之间,设置为导通后将所述第一电源提供的电压传输至所述驱动模块的第一端;所述数据写入模块连接于所述驱动模块的控制端和数据线之间,设置为在数据写入阶段向所述驱动模块的控制端传输所述数据线提供的数据电压;所述发光模块连接于所述驱动模块的第二端和第二电源之间;所述第一存储模块连接于所述驱动模块的控制端,设置为存储所述驱动模块的控制端的电压;所述第二存储模块设置为存储所述驱动模块的第一端或者第二端的电压;所述初始化模块设置为在初始化阶段向所述驱动模块的控制端以及所述发光模块写入初始化电压,对所述驱动模块的控制端以及所述发光模块进行初始化,并在补偿阶段持续向所述驱动模块的控制端写入初始化电压。
- 根据权利要求1所述的像素电路,其中,所述初始化模块包括第一初始化模块和第二初始化模块;所述第一初始化模块连接于所述驱动模块的控制端和第一初始化信号线之间,所述第一初始化模块设置为导通后将所述第一初始化信号线提供的第一初始化电压传输至所述驱动模块的控制端;所述第二初始化模块连接于所述发光模块的第一端和第二初始化信号线之间,所述发光模块的第二端连接所述第二电源,所述第二初始化模块设置为在导通后将第二初始化信号线提供的第二初始化电压传输至所述发光模块的第一端。
- 根据权利要求2所述的像素电路,其中,所述第一初始化模块的控制端连接第一扫描线,所述第一初始化模块的第一端连接所述第一初始化信号线,所述第一初始化模块的第二端与所述驱动模块的控制端连接;所述数据写入模块的控制端连接第二扫描线,所述数据写入模块的第一端连接所述数据线,所述数据写入模块的第二端与所述驱动模块的控制端连接;所述第二初始化模块的控制端连接第三扫描线,所述第二初始化模块的第一端连接所述第二初始化信号线,所述第二初始化模块的第二端与所述发光模块的第一端连接;所述第一发光控制模块的控制端连接发光控制信号线,所述第一发光控制模块的第一端连接所述第一电源,所述第一发光控制模块的第二端与所述驱动 模块的第一端连接,所述驱动模块的第二端与所述发光模块的第一端连接;所述第一存储模块的第一端与所述驱动模块的控制端连接,所述第一存储模块的第二端与所述驱动模块的第二端连接;所述第二存储模块的第一端连接所述第一电源,所述第二存储模块的第二端与所述驱动模块的第二端连接。
- 根据权利要求3所述的像素电路,其中,所述驱动模块包括第一晶体管,所述数据写入模块包括第二晶体管,所述第一初始化模块包括第三晶体管,所述第二初始化模块包括第四晶体管,所述第一发光控制模块包括第五晶体管,所述第一存储模块包括第一电容,所述第二存储模块包括第二电容,所述发光模块包括发光二极管;所述第三晶体管的栅极与所述第一扫描线连接,所述第三晶体管的第一极与所述第一初始化信号线连接,所述第三晶体管的第二极与所述第一晶体管的栅极连接,所述第一晶体管的第一极与所述第五晶体管的第二极连接,所述第五晶体管的第一极与所述第一电源连接,所述第五晶体管的栅极连接所述发光控制信号线,所述第一晶体管的第二极与所述发光二极管的第一极连接,所述发光二极管的第二极与所述第二电源连接;所述第二晶体管的栅极与所述第二扫描线连接,所述第二晶体管的第一极与所述数据线连接,所述第二晶体管的第二极与所述第一晶体管的栅极连接;所述第四晶体管的栅极与所述第三扫描线连接,所述第四晶体管的第一极与所述第二初始化信号线连接,所述第四晶体管的第二极与所述第一晶体管的第二极连接;所述第一电容的第一端与所述第一晶体管的栅极连接,所述第一电容的第二端与所述第一晶体管的第二极连接,所述第二电容的第一端与所述第一电源连接,所述第二电容的第二端与所述第一晶体管的第二极连接。
- 根据权利要求4所述的像素电路,其中,所述第一晶体管、所述第二晶体管、所述第三晶体管、所述第四晶体管与所述第五晶体管分别为N型晶体管。
- 根据权利要求4所述的像素电路,其中,所述像素电路还包括第二发光控制模块,所述第二发光控制模块包括第六晶体管;所述第六晶体管的栅极与所述发光控制信号线连接,所述第六晶体管的第一极与所述第一晶体管的第二极连接,所述第六晶体管的第二极与所述发光二极管的第一极连接。
- 根据权利要求6所述的像素电路,其中,所述第一电容的第二端通过所述第六晶体管与所述第一晶体管的第二极连接。
- 根据权利要求3所述的像素电路,其中,所述第二初始化电压小于所述第一初始化电压,且所述第一初始化电压小于所述发光二极管的起亮电压。
- 根据权利要求3所述的像素电路,其中,在初始化阶段,所述第一发光控制模块被配置为关断或导通。
- 根据权利要求2所述的像素电路,其中,所述第一初始化模块的控制端连接第一扫描线,所述第一初始化模块的第一端连接所述第一初始化信号线,所述第一初始化模块的第二端与所述驱动模块的控制端连接;所述数据写入模块的控制端连接第二扫描线,所述数据写入模块的第一端连接所述数据线,所述数据写入模块的第二端与所述驱动模块的控制端连接;所述第二初始化模块的控制端连接所述第一扫描线,所述第二初始化模块的第一端连接所述第二初始化信号线,所述第二初始化模块的第二端与所述发光模块的第一端连接;所述第一发光控制模块的控制端连接发光控制信号线,所述第一发光控制模块的第一端连接所述第一电源,所述第一发光控制模块的第二端与所述驱动模块的第一端连接,所述驱动模块的第二端与所述发光模块的第一端连接;所述第一存储模块的第一端与所述驱动模块的控制端连接,所述第一存储模块的第二端与所述驱动模块的第一端连接;所述第二存储模块的第一端连接所述第一电源,所述第二存储模块的第二端与所述驱动模块的第一端连接。
- 根据权利要求10所述的像素电路,其中,所述驱动模块包括第一晶体管,所述数据写入模块包括第二晶体管,所述第一初始化模块包括第三晶体管,所述第二初始化模块包括第四晶体管,所述第一发光控制模块包括第五晶体管,所述第一存储模块包括第一电容,所述第二存储模块包括第二电容,所述发光模块包括发光二极管;所述第三晶体管的栅极与所述第一扫描线连接,所述第三晶体管的第一极与所述第一初始化信号线连接,所述第三晶体管的第二极与所述第一晶体管的栅极连接,所述第一晶体管的第一极与所述第五晶体管的第二极连接,所述第五晶体管的第一极与所述第一电源连接,所述第五晶体管的栅极连接所述发光控制信号线,所述第一晶体管的第二极与所述发光二极管的第一极连接,所述发光二极管的第二极与所述第二电源连接;所述第二晶体管的栅极与所述第二扫描线连接,所述第二晶体管的第一极与所述数据线连接,所述第二晶体管的第二极与所述第一晶体管的栅极连接;所述第四晶体管的栅极与所述第一扫描线连接,所述第四晶体管的第一极与所 述第二初始化信号线连接,所述第四晶体管的第二极与所述第一晶体管的第二极连接;所述第一电容的第一端与所述第一晶体管的栅极连接,所述第一电容的第二端与所述第一晶体管的第一极连接,所述第二电容的第一端与所述第一电源连接,所述第二电容的第二端与所述第一晶体管的第一极连接。
- 根据权利要求11所述的像素电路,其中,所述第一晶体管、所述第二晶体管、所述第三晶体管、所述第四晶体管与所述第五晶体管分别为P型晶体管。
- 根据权利要求11所述的像素电路,其中,所述像素电路还包括第二发光控制模块,所述第二发光控制模块包括第六晶体管;所述第六晶体管的栅极与所述发光控制信号线连接,所述第六晶体管的第一极与所述第一晶体管的第二极连接,所述第六晶体管的第二极与所述发光二极管的第一极连接。
- 根据权利要求10所述的像素电路,其中,所述第一初始化电压等于所述第二初始化电压,所述第一初始化电压小于所述第二电源提供的电压。
- 一种像素电路的驱动方法,所述像素电路包括初始化模块、第一存储模块、第二存储模块、驱动模块、数据写入模块、第一发光控制模块和发光模块;所述第一发光控制模块连接于第一电源和所述驱动模块的第一端之间,所述数据写入模块连接于所述驱动模块的控制端和数据线之间,所述发光模块连接于所述驱动模块的第二端和第二电源之间,所述第一存储模块连接于所述驱动模块的控制端,设置为存储所述驱动模块的控制端的电压,所述第二存储模块设置为存储所述驱动模块的第一端或者第二端的电压;所述像素电路的驱动方法包括:在初始化阶段,通过所述初始化模块向所述驱动模块的控制端以及所述发光模块写入初始化电压,对所述驱动模块的控制端以及所述发光模块进行初始化,并在补偿阶段持续向所述驱动模块的控制端写入初始化电压;在数据写入阶段,通过所述数据写入模块向所述驱动模块的控制端传输所述数据线提供的数据电压。
- 根据权利要求15所述的像素电路的驱动方法,其中,所述初始化模块包括第一初始化模块和第二初始化模块;所述第一初始化模块连接于所述驱动模块的控制端和第一初始化信号线之间,所述第二初始化模块连接于所述发光模块的第一端和第二初始化信号线之间;所述像素电路的驱动方法包括:在初始化阶段,控制所述第一初始化模块和所述第二初始化模块导通,控制所述数据写入模块关断,以及控制所述第一发光控制模块导通或关断;在补偿阶段,控制所述第一初始化模块和所述第一发光控制模块导通,控制所述数据写入模块和所述第二初始化模块关断;在数据写入阶段,控制所述数据写入模块导通,控制所述第一初始化模块、所述第二初始化模块和所述第一发光控制模块关断;在发光阶段,控制所述第一发光控制模块导通,控制所述第一初始化模块、所述第二初始化模块和所述数据写入模块关断。
- 根据权利要求15所述的像素电路的驱动方法,其中,所述初始化模块包括第一初始化模块和第二初始化模块;所述第一初始化模块连接于所述驱动模块的控制端和第一初始化信号线之间,所述第二初始化模块连接于所述发光模块的第一端和第二初始化信号线之间;所述像素电路的驱动方法包括:在初始化阶段和补偿阶段,控制所述第一初始化模块和所述第二初始化模块导通,控制所述数据写入模块、所述第一发光控制模块关断;在数据写入阶段,控制所述数据写入模块导通,控制所述第一初始化模块、所述第二初始化模块和所述第一发光控制模块关断;在发光阶段,控制所述第一发光控制模块导通,控制所述第一初始化模块、所述第二初始化模块和所述数据写入模块关断。
- 一种显示面板,包括如权利要求1-14任一项所述的像素电路。
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