CN112669748A - Pixel driving circuit, driving method thereof and display device - Google Patents

Pixel driving circuit, driving method thereof and display device Download PDF

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Publication number
CN112669748A
CN112669748A CN202011534523.6A CN202011534523A CN112669748A CN 112669748 A CN112669748 A CN 112669748A CN 202011534523 A CN202011534523 A CN 202011534523A CN 112669748 A CN112669748 A CN 112669748A
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display area
voltage signal
module
constant voltage
driving
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谢锋
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Xiamen Tianma Microelectronics Co Ltd
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Xiamen Tianma Microelectronics Co Ltd
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Abstract

The invention discloses a pixel driving circuit, a driving method thereof and a display device, wherein the pixel driving circuit comprises a data writing module, a threshold compensation module and a driving module, and the driving module comprises an input end, an output end and a control end; the data writing module is used for writing the data signal into the input end of the driving module; the threshold compensation module is used for writing a compensation signal into a control end of the driving module, the compensation signal is used for threshold compensation of the driving module, the threshold compensation module comprises a first control end and a second control end, the first control end is used for inputting a first scanning signal, and the second control end is used for providing a constant voltage signal at part of time; and the driving module is used for providing a driving current according to the data signal and the compensation signal. According to the invention, the threshold compensation module is arranged, and the second control end of the threshold compensation module is used for providing a constant voltage signal at part of time, so that the problem that the display uniformity is influenced by different driving currents caused by different voltage differences between the input end and the control end of the driving module is compensated.

Description

Pixel driving circuit, driving method thereof and display device
Technical Field
The invention relates to the technical field of display, in particular to a pixel driving circuit, a driving method thereof and a display device.
Background
A Pixel Circuit (Pixel Circuit) is an important structure for controlling light-emitting elements in various display panels to perform display as required. The pixel circuit generally includes a light emission control module including a capacitor and a plurality of thin film transistors, an initialization module, a data write module, and the like, in which a power supply signal (VDD) is supplied to the light emission control module through a VDD line, but the VDD line has a certain resistance. Therefore, the voltage of the power supply signal passing through each of the VDD lines is different, that is, the voltage of the VDD line supplied to the pixel circuits connected thereto at each of the locations is different. This phenomenon is called IR Drop (English: IR Drop).
Because the brightness of the light-emitting control module of the pixel circuit is related to the power signal (VDD), the IRDrop causes different gate-source voltages of the driving modules in the pixel circuits at different positions, and further causes different driving currents generated by the driving modules, so that the brightness of the light-emitting control module is inconsistent, the brightness difference occurs, and the display uniformity is affected.
Disclosure of Invention
In view of the above, the present invention provides a pixel driving circuit, a driving method thereof, and a display device, wherein a threshold compensation module is provided, and a second control terminal of the threshold compensation module is used for providing a constant voltage signal at a part of time, so as to compensate a problem that a difference in voltage between an input terminal and a control terminal of the driving module causes a difference in driving current, which affects display uniformity.
In one aspect, the present invention provides a pixel driving circuit, including:
the device comprises a data writing module, a threshold compensation module and a driving module, wherein the driving module comprises an input end, an output end and a control end;
the data writing module is used for writing a data signal into the input end of the driving module;
the threshold compensation module is used for writing a compensation signal into the control end of the driving module, the compensation signal is used for threshold compensation of the driving module, the threshold compensation module comprises a first control end and a second control end, the first control end is used for inputting a first scanning signal, and the second control end is used for providing a constant voltage signal at a part of time;
the driving module is used for providing a driving current according to the data signal and the compensation signal.
In yet another aspect, the present invention provides a display device comprising any one of the pixel driving circuits provided in the present application. The pixel driving circuit further comprises a light emitting element, one end of the light emitting element is connected to the fourth node in the pixel driving circuit, and the other end of the light emitting element is connected to the second power supply voltage input end.
In another aspect, the present invention provides a driving method for a display device, which is used for the display device, the display device includes a display area and a non-display area surrounding the display area, the non-display area includes a driving chip, the display area includes a first display area and a second display area, and the second display area is located between the first display area and the driving chip;
the method comprises the following steps:
in the threshold compensation stage: the second control terminal in the first display area provides a first constant voltage signal, and the second control terminal in the second display area provides a second constant voltage signal;
the voltage of the first constant voltage signal is smaller than that of the second constant voltage signal, so that when the threshold compensation stage is finished, the control end potential of the driving module in the first display area is lower than that of the driving module in the second display area.
Compared with the prior art, the pixel driving circuit, the driving method thereof and the display device provided by the invention have the advantages that the pixel driving circuit comprises a data writing module, a threshold compensation module and a driving module, the threshold compensation module is used for writing a compensation signal into a control end of the driving module, the compensation signal is used for carrying out threshold compensation on the driving module, the threshold compensation module comprises a first control end and a second control end, the first control end is used for inputting a first scanning signal, and the second control end is used for providing a constant voltage signal at part of time. According to the invention, the threshold compensation module comprises the first control end and the second control end, the data writing capability of the threshold compensation module is controlled by combining the electric field generated by the second control end with the electric field generated by the first control end, and the voltage of the control end of the driving module is further adjusted to compensate different voltage difference values between the input end and the control end of the driving module, so that the driving currents provided by the driving module are similar, and the problem of uneven display can be solved.
Of course, it is not necessary for any product in which the present invention is practiced to specifically achieve all of the above technical effects simultaneously.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, 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 together with the description, serve to explain the principles of the invention.
FIG. 1 is a schematic diagram of a prior art pixel driving circuit;
fig. 2 is a schematic structural diagram of a pixel driving circuit according to the present invention;
FIG. 3 is a schematic structural diagram of another pixel driving circuit according to the present invention;
FIG. 4 is a schematic diagram of a pixel driving circuit according to another embodiment of the present invention;
FIG. 5 is a schematic diagram of a pixel driving circuit according to another embodiment of the present invention;
fig. 6 is a schematic structural diagram of another pixel driving circuit provided in the present invention;
FIG. 7 is a schematic diagram of a pixel driving circuit according to another embodiment of the present invention;
fig. 8 is a schematic structural diagram of another pixel driving circuit provided in the present invention;
FIG. 9 is a schematic view of a display device according to the present invention;
FIG. 10 is an enlarged view of a portion of Q of FIG. 9;
FIG. 11 is a schematic view of another display device provided in the present invention;
FIG. 12 is a flowchart of a driving method of the display device;
FIG. 13 is a schematic view of another display device provided in the present invention;
fig. 14 is a schematic view of another display device provided by the present invention.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
Referring to fig. 1, fig. 1 is a schematic diagram of a pixel driving circuit in the prior art. The pixel driving circuit 100 in the prior art includes a data writing module 01, a threshold compensation module 02 and a driving module 03, wherein the driving module 03 includes an input terminal a01, an output terminal b01 and a control terminal c 01; the data writing module 01 is used for writing a data signal into the input end a01 of the driving module 03; the threshold compensation module 02 is configured to write a compensation signal into the control terminal c01 of the driving module 03, where the compensation signal is used to perform threshold compensation on the driving module 03, the threshold compensation module 02 includes a first control terminal S01, the first control terminal S01 is used to input a first scan signal, and the driving module 03 is configured to provide a driving current according to a data signal and the compensation signal.
The pixel driving circuit 100 further includes an input terminal Vin, an output terminal Vou, and a reset signal input terminal Vref, where the reset voltage signal terminal Vref transmits a reset voltage signal to the first node N1, the potential of the first node N1 rises to the reset voltage signal, the third control terminal S03 controls the data writing module 01 to be turned on, so that the data signal provided by the data signal terminal Vdata is transmitted to the second node N2, the second node N2 transmits the data signal to the driving module 03, and since the driving module 03 has a threshold voltage, the voltage transmitted to the third node N3 is the data signal minus the threshold voltage value, and the data signal is transmitted to the first node through the threshold compensation module 02 until the voltage at the control terminal c0 of the driving transistor 03 is the threshold voltage, and the input terminal Vin sequentially transmits the input signal to the second node N2, the driving module 03, the third node N3, and the output terminal Vout. However, the input signal at the input terminal Vin has a voltage drop problem, and the output signal to the output terminal Vout is different, which may cause display non-uniformity.
In order to solve the above technical problems, the present invention provides a pixel driving circuit, a driving method thereof, and a display device. The pixel driving circuit, the driving method thereof, and the display device provided by the present invention are described in detail below.
In this embodiment, referring to fig. 2, fig. 2 is a schematic structural diagram of a pixel driving circuit according to the present invention. The pixel driving circuit 200 in the present embodiment includes: the driving module 3 comprises an input end a0, an output end b0 and a control end c 0; the data writing module 1 is used for writing a data signal into the input end a0 of the driving module 3; the threshold compensation module 2 is configured to write a compensation signal into the control terminal c0 of the driving module 3, where the compensation signal is used to perform threshold compensation on the driving module 3, the threshold compensation module 2 includes a first control terminal S1 and a second control terminal S2, the first control terminal S1 is used to input a first scan signal, and the second control terminal S2 is used to provide a constant voltage signal at a partial time; and the driving module 3 is used for providing a driving current according to the data signal and the compensation signal.
Wherein the second control terminal S2 is used for providing a constant voltage signal at a part of the time, i.e. the first scanning signal is inputted to the first control terminal S1 to control the threshold compensation module 2 to start the threshold compensation period, and the second control terminal S2 is used for providing a constant voltage signal at a part of the time.
Optionally, the pixel driving circuit 200 further includes an input terminal Vin for providing an input signal, an output terminal Vout for outputting an output signal, and a reset signal input terminal Vref for providing an initialization signal to initialize the first node N1. It can be understood that, by setting the threshold compensation module 2 to include the first control terminal S1 and the second control terminal S2, the first scan signal is inputted to the first control terminal S1 to control the threshold compensation module 2 to start the threshold compensation, during the threshold compensation period, the second control terminal S2 is used to provide a constant voltage signal, i.e. the data writing capability of the threshold compensation module 2 is changed by the constant voltage signal provided by the second control terminal, and by providing different constant voltage signals to the second control terminals of different pixel driving circuits, and then fine-adjusting the potential of the control terminal c0 of each driving module 3 in the same writing time, so as to compensate the signal voltage drop received by the input terminal a0 of the driving module 3, so that the driving current provided by each driving module 3 is similar, thereby solving the problem that the input signal voltage drop provided by the input terminal Vin affects the output signal output by the output terminal Vout, and then the problem of uneven display can be solved. The driving currents provided by the driving modules 3 can be similar, the driving currents provided by the driving modules 3 are not limited to be equal, only the driving currents provided by the driving modules 3 are similar, and the driving currents cannot be obviously different when observed by human eyes.
In some alternative embodiments, referring to fig. 3, fig. 3 is a schematic structural diagram of another pixel driving circuit provided in the present invention. The pixel driving circuit 200 in the present embodiment includes: the driving module comprises a driving transistor M0, wherein the driving transistor M0 comprises an input end a0, an output end b0 and a control end c 0; the control terminal c0 of the driving transistor M0 is connected to the first node N1, the input terminal a0 thereof is connected to the second node N2, and the output terminal b0 thereof is connected to the third node N3; the first node N1 is connected to the output terminal b of the threshold compensation block 2, and the second node N2 is connected to the output terminal b of the data write block 1dataThe third node N3 is connected to the input a of the threshold compensation module 2.
It is understood that the driving module 3 includes a driving transistor M0, the driving transistor M0 includes an input terminal a0, an output terminal b0 and a control terminal c 0; the input terminal a0 of the driving transistor M0 corresponds to the input terminal a0 of the driving module, the output terminal b0 of the driving transistor M0 corresponds to the output terminal b0 of the driving module, and the control terminal c0 of the driving transistor M0 corresponds to the control terminal c0 of the driving module. The control terminal c0 of the driving transistor M0 is connected to the first node N1, and the first node N1 is connected to the complementary thresholdThe voltage signal at the output terminal b of the compensation module 2, i.e. the output terminal b of the threshold compensation module 2, controls the voltage signal at the position of the first node N1, and the driving transistor M0 controls the potential of the control terminal c0 through the potential at the position of the first node N1, so as to control the conduction condition of the driving transistor M0. And the input terminal a0 of the driving transistor M0 is connected to the second node N2, and the second node N2 is connected to the output terminal b of the data writing module 1dataAnd its output terminal b0 is connected to the third node N3; the third node N3 is connected to the input a of the threshold compensation module 2.
Further, when the third node N3 writes the data signal into the threshold compensation module 2, the threshold compensation module 2 inputs the first scan signal into the first control terminal S1 to control the threshold compensation module 2 to start the threshold compensation, during the threshold compensation period, the second control terminal S2 is configured to provide a constant voltage signal, the data writing capability of the threshold compensation module 2 is changed by using the constant voltage signal provided by the second control terminal, and the voltage drop received by the input terminal a0 of the driving module 3 is compensated by providing different constant voltage signals to the second control terminals of different pixel driving circuits to fine-adjust the potential of the control terminal c0 of each driving module 3 within the same writing time, so that the driving currents provided by each driving module 3 are similar, and the problem of non-uniform display can be solved.
In some alternative embodiments, referring to fig. 4, fig. 4 is a schematic structural diagram of another pixel driving circuit provided in the present invention. The pixel driving circuit 200 in the present embodiment further includes a light emission control module 4, and the light emission control module 4 includes a first transistor M1 and a second transistor M2; a first transistor M1, of which a control terminal c1 is connected to the light-emitting signal input terminal Emit, an input terminal a1 is connected to the first power supply voltage input terminal PVDD, and an output terminal b1 is connected to the second node N2; the second transistor M2 has a control terminal c2 connected to the light-emitting signal input terminal Emit, an input terminal a2 connected to the third node N3, and an output terminal b2 connected to the fourth node N4.
It is understood that the pixel driving circuit 200 further includes a light emission control module 4, and the light emission control module 4 is used for providing a light emission signal. The light emission control module 4 includes a first transistor M1 and a second transistor M2; first crystalThe control terminals of the transistor M1 and the second transistor M2 are both connected to the light-emitting signal input terminal Emit, that is, the transistor M1 and the second transistor M2 are controlled to be turned on and off by a forensic signal provided by the light-emitting signal input terminal Emit, and further, when the transistor M1 and the second transistor M2 are turned on, a first power voltage signal provided by the first power voltage input terminal PVDD sequentially passes through the first transistor M2, the second node N2, the driving transistor M0, the second transistor M2 and the fourth node N4. Wherein, the magnitude of the light emitting signal current I ═ K [ V ] of the pixel driving circuit 200PVDD-(Vdata-Vth)-|Vth|]2Wherein K is a constant, VPVDDA first supply voltage signal V provided to a first supply voltage input PVDDN1Is a voltage signal at the position of the first node N1, VthTo compensate the signal. Due to the first supply voltage signal V provided by the first supply voltage input PVDDPVDDThe voltage drop problem can cause the first power supply voltage signal V to be acceptedPVDDIs changed, and thus the first supply voltage signal VPVDDConversion to VPVDD±VΔ1Further, the driving current of the pixel driving circuit 200 varies at different positions, thereby causing non-uniform display. Therefore, the present application provides the threshold compensation module 2, the threshold compensation module 2 inputs the first scan signal at the first control terminal S1 to control the threshold compensation module 2 to start the threshold compensation, during the threshold compensation period, the second control terminal S2 is used to provide the constant voltage signal, the constant voltage signal provided by the second control terminal is used to change the data writing capability of the threshold compensation module 2, the different constant voltage signals are provided to the second control terminals in different pixel driving circuits, and the potential of the control terminal c0 of each driving module 3 is finely adjusted within the same writing time, so that the potential of the control terminal c0 is adjusted from V0data-VthConversion to Vdata-VthWhen the current value of the light-emitting signal of the pixel driving circuit 200 is ± Δ V, the current value is converted to K [ (V)PVDD±ΔV')-(Vdata-Vth±ΔV)-Vth]2＝K[(VPVDD-Vdata)±(ΔV'-ΔV)]2Due to a supply voltage signal V at this timePVDDThe variation of the voltage can be compensated by the variation of the voltage at the control terminal c0, and the constant voltage signal provided by the second control terminal S2 can be used to compensate the first power voltage signal V provided by the first power voltage input terminal PVDDPVDDThe voltage drop problem of (2) makes the magnitude of the light-emitting signal current of the pixel driving circuit 200 similar, thereby solving the problem of non-uniform display.
In some alternative embodiments, referring to fig. 5, fig. 5 is a schematic structural diagram of another pixel driving circuit provided in the present invention. The pixel driving circuit 200 in the present embodiment further includes a reset module 6, wherein the reset module 6 includes a third transistor M3 and a fourth transistor M4; the third transistor M3, of which the control terminal c3 is connected to the first SCAN signal input terminal SCAN1, the input terminal a3 is connected to the reference voltage signal terminal Vref, the output terminal b3 is connected to the first node N1, and the first node N1 is initialized; the fourth transistor M4, having a control terminal c4 connected to the second SCAN signal input terminal SCAN2, an input terminal a4 connected to the reference voltage signal terminal Vref, and an output terminal b4 connected to the fourth node N4, initializes the fourth node N4.
It is understood that when the first SCAN signal input terminal SCAN1 controls the third transistor M3 to be turned on, the reference voltage signal provided by the reference voltage signal terminal Vref is written into the first node N1, and the voltage signal of the first node N1 is the reference voltage signal, so that the first node N1 initializes the potential of the control terminal c0 of the driving transistor M0. When the fourth transistor M4 is turned on under the control of the second SCAN signal input terminal SCAN2, the reference voltage signal provided by the reference voltage signal terminal Vref is written into the fourth node N4, and the fourth node N4 is initialized.
In some alternative embodiments, referring to fig. 6, fig. 6 is a schematic structural diagram of another pixel driving circuit provided in the present invention. The pixel driving circuit 200 in this embodiment further includes a storage module 5, where the storage module 5 includes a storage capacitor Cst; one end of the storage capacitor Cst is connected to a first power voltage input terminal PVDD, and the other end thereof is connected to the first node N1.
It can be understood that the charge is forced to move in the electric field, when a medium is present between the conductors, the movement of the charge is hindered, so that the charge is accumulated on the conductors, and the charge is accumulated and stored, the storage capacitor Cst can store the charge, and the storage capacitor Cst is used for maintaining the voltage signal of the first node N1, that is, the first node N1 maintains the reference voltage signal under the action of the storage capacitor Cst, so that the first node N1 can control the driving transistor M0 to continuously maintain the on state for data writing.
In some alternative embodiments, referring to fig. 7, fig. 7 is a schematic structural diagram of another pixel driving circuit provided in the present invention. The pixel driving circuit 200 of the present embodiment includes an oxide transistor M, the oxide transistor M includes a first gate S1, a second gate S2, an input end a, and an output end b, the first gate c11 is connected to the first control end S1, the second gate c22 is connected to the second control end S2, the input end a of the oxide transistor M is connected to the output end b0 of the driving module 3, and the output end b of the oxide transistor M is connected to the control end c0 of the driving module 3.
It is understood that the first gate c11 is connected to the first control terminal S1, the first control terminal S1 is used for inputting the first scan signal, the first control terminal S1 controls whether the oxide transistor M is turned on, and the second gate c22 is connected to the second control terminal S2, the second control terminal S2 is used for providing the constant voltage signal at some time. When the oxide transistor M is turned on, the voltage signal of 3 at the position of the third node N is written into the position of the first node N1, but the writing capability is different due to the influence of the turn-on time of the oxide transistor M and the current magnitude when the oxide transistor M is turned on, and the longer the oxide transistor M is turned on, the larger the turn-on current is; the more sufficient the voltage signal of 3 at the position of the third node N is written into the voltage signal at the position of the first node N1. The second control terminal S2 is used for providing a constant voltage signal, the data writing capability of the threshold compensation module 2 is changed by using the constant voltage signal provided by the second control terminal, and the potential of the control terminal c0 of each driving module 3 is fine-adjusted within the same writing time by providing different constant voltage signals to the second control terminals of different pixel driving circuits, because a power voltage signal V is applied at this timePVDDCan be controlled by the potential of the control terminal c0The variation compensation is performed, and the constant voltage signal provided by the second control terminal S2 can be used to compensate the first power voltage signal V provided by the first power voltage input terminal PVDDPVDDThe voltage drop problem of (2) makes the magnitude of the light-emitting signal current of the pixel driving circuit 200 similar, thereby solving the problem of non-uniform display.
In some alternative embodiments, referring to fig. 8, fig. 8 is a schematic structural diagram of another pixel driving circuit provided in the present invention. The data writing module 1 of the pixel driving circuit 200 in this embodiment includes a fifth transistor M5, a control terminal c5 of the fifth transistor M5 is connected to the second SCAN signal input terminal SCAN2, an input terminal a5 thereof is connected to the data signal input terminal Vdata, and an output terminal b5 thereof is equivalent to the output terminal b of the data writing module 1dataAnd an output terminal b5 thereof is connected to the second node N2.
It is understood that the second SCAN signal provided from the second SCAN signal input terminal SCAN2 controls whether the fifth transistor M5 is turned on, and when the fifth transistor M5 is turned on, the data signal provided from the data signal input terminal Vdata is written into the second node N2, so that the data signal is subsequently written into the third node N3 and the first node N1 in turn, thereby completing the threshold compensation of the pixel driving circuit 200.
The present invention further provides a display device 300, which is shown in fig. 9 and 10, wherein fig. 9 is a schematic view of the display device provided by the present invention, and fig. 10 is a partial enlarged view of Q in fig. 9. The display device 300 comprises the pixel driving circuit 200 provided by any of the above embodiments of the invention; and a light emitting element O having one end connected to the fourth node N4 in the pixel driving circuit 200 and the other end connected to a second power voltage input terminal PVEE.
It is understood that the display device 300 further includes a power source signal line LPVDDFor supplying a first supply voltage signal to the first supply voltage input terminal PVDD, due to the supply signal line LPVDDThere is a certain resistance. Thus, the power signal line LPVDDLoss of signal present, i.e. away from the power supply signal line LPVDDThe input end is directed to one side of the output end, i.e. J is directed to the direction of I, and the power signal line LPVDDGradually increase in loss ofLarge, and thus power signal line LPVDDThe first power voltage signal provided to the first power voltage input terminal PVDD decreases gradually, which causes the magnitude of the light-emitting signal current received by the light-emitting element O to decrease gradually, and affects the brightness uniformity of the display device 300.
And the magnitude of the current of the light-emitting signal of the pixel driving circuit 200 is K [ V ═ K [ ]PVDD-(Vdata-Vth)-|Vth|]2Wherein K is a constant, VPVDDA first supply voltage signal V provided to a first supply voltage input PVDDN1Is a voltage signal at the position of the first node N1, VthTo compensate the signal. Due to the first supply voltage signal V provided by the first supply voltage input PVDDPVDDThe voltage drop problem can cause the first power supply voltage signal V to be acceptedPVDDIs changed, and thus the first supply voltage signal VPVDDConversion to VPVDD±VΔ1Further, the driving current of the pixel driving circuit 200 varies at different positions, thereby causing non-uniform display. Therefore, the present application provides the threshold compensation module 2, the threshold compensation module 2 inputs the first scan signal at the first control terminal S1 to control the threshold compensation module 2 to start the threshold compensation, during the threshold compensation period, the second control terminal S2 is used to provide the constant voltage signal, the constant voltage signal provided by the second control terminal is used to change the data writing capability of the threshold compensation module 2, the different constant voltage signals are provided to the second control terminals in different pixel driving circuits, and the potential of the control terminal c0 of each driving module 3 is finely adjusted within the same writing time, so that the potential of the control terminal c0 is adjusted from V0data-VthConversion to Vdata-VthWhen the current value of the light-emitting signal of the pixel driving circuit 200 is ± Δ V, the current value is converted to K [ (V)PVDD±ΔV')-(Vdata-Vth±ΔV)-Vth]2＝K[(VPVDD-Vdata)±(ΔV'-ΔV)]2Due to a supply voltage signal V at this timePVDDThe variation of the voltage at the control terminal c0 can be compensated, and the constant voltage signal provided by the second control terminal S2 can be used to compensate the variation of the voltage at the first power voltage input terminal PVDDSupplied first supply voltage signal VPVDDThe voltage drop problem of (2) makes the magnitude of the light-emitting signal current of the pixel driving circuit 200 similar, thereby solving the problem of non-uniform display.
In some alternative embodiments, as shown in fig. 11, fig. 11 is a schematic view of another display device provided by the present invention. The display device 300 provided by the embodiment includes a display area AA and a non-display area BB surrounding the display area, the non-display area BB includes a driving chip IC, the display area AA includes a first display area AA1 and a second display area AA2, and the second display area AA2 is located between the first display area AA1 and the driving chip IC; the second control terminal S2 in the first display area AA1 is used to provide a first constant voltage signal at a partial time, and the second control terminal S2 in the second display area AA2 is used to provide a second constant voltage signal at a partial time, wherein the voltage of the first constant voltage signal is less than that of the second constant voltage signal.
In the invention, how many pixel driving circuits 200 are included in the first display area AA1 and the second display area AA2 is not specifically limited, and may be set according to actual situations, and details are not described below.
In some alternative embodiments, continuing with fig. 10, 11 and 12, fig. 12 is a flow chart of a driving method of a display device. The driving method of the display device provided in this embodiment is used for driving the display device 300 shown in fig. 11, that is, the display device 300 includes a display area AA and a non-display area BB surrounding the display area, the non-display area BB includes a driving chip IC, the display area AA includes a first display area AA1 and a second display area AA2, and the second display area AA2 is located between the first display area AA1 and the driving chip IC.
The method comprises the following steps:
in the threshold compensation stage: the second control terminal S2 in the first display area AA1 provides a first constant voltage signal, and the second control terminal S2 in the second display area AA2 provides a second constant voltage signal;
the voltage of the first constant voltage signal is less than that of the second constant voltage signal, so that the control terminal c0 of the driving module 3 in the first display area AA1 is lower than the control terminal c0 of the driving module 3 in the second display area AA2 when the threshold compensation phase is finished.
Optionally, the method further includes a reset phase: when the third transistor M3 is turned on under the control of the first SCAN signal input terminal SCAN1 of the pixel driving circuit 200 in the display area AA1, the reference voltage signal provided by the reference voltage signal terminal Vref is written into the first node N1, and the voltage signal of the first node N1 is the reference voltage signal, so that the first node N1 initializes the potential of the control terminal c0 of the driving transistor M0.
And, the threshold compensation stage further includes that the second SCAN signal input terminal SCAN2 controls the fifth transistor M5 to be turned on, the data signal is written into the second node N2, since the first node N1 maintains the reference voltage signal under the action of the storage capacitor Cst, the first node N1 can control the driving transistor M0 to be kept in a conducting state, the data signal is written into the third node through the driving transistor M0, the first control terminal S1 inputs the first SCAN signal that the oxide transistor M is turned on, the data signal is written into the first node N1 through the oxide transistor M0, the second control terminal S2 can be used to provide a constant voltage signal, the constant voltage signal provided by the second control terminal is used to change the data writing capability of the threshold compensation module 2, the potential of the control terminal c0 of each driving module 3 can be finely adjusted in the same writing time by providing different constant voltage signals to the second control terminals of different pixel driving circuits, since a supply voltage signal V is present at this timePVDDThe variation of the voltage can be compensated by the variation of the voltage at the control terminal c0, and the constant voltage signal provided by the second control terminal S2 can be used to compensate the first power voltage signal V provided by the first power voltage input terminal PVDDPVDDThe voltage drop problem of (2) makes the magnitude of the light-emitting signal current of the pixel driving circuit 200 similar, thereby solving the problem of non-uniform display.
Further, since the second display area AA2 is located between the first display area AA1 and the driver chip IC, the power signal line L received by the first display area AA1PVDDProviding the first power supply voltage input terminal PVDD with the first power supply voltage signal line L smaller than the second display area AA2PVDDThe first power voltage signal is provided to the first power voltage input terminal PVDD, so that the control of the driving module 3 in the first display area AA1 needs to be performed relative to the second display area AA2The relatively more decreased electric potential at the terminal c0 is used for compensating that the first power voltage signal received by the first display area AA1 is smaller than the difference of the first power voltage signal of the second display area AA2, so that the capability of the first display area AA1 for compensating the electric field generated by the electric field S2 generated by the second control terminal of the threshold compensation module 2 in the second display area AA2 needs to be stronger, and the second control terminal S2 in the first display area AA1 is further configured to provide the first constant voltage signal smaller than the second control terminal S2 in the second display area AA2 for providing the second constant voltage signal at a part of the time.
In some alternative embodiments, as shown in fig. 13, fig. 13 is a schematic view of another display device provided by the present invention. The display area AA of the display device 300 provided in this embodiment further includes a third display area AA3, and the third display area AA3 is located between the first display area AA1 and the second display area AA 2; the second control terminal S2 in the third display area AA3 is used for providing a third constant voltage signal at a partial time, wherein the voltage of the third constant voltage signal is less than that of the second constant voltage signal and greater than that of the first constant voltage signal.
In the invention, how many pixel driving circuits 200 are included in the first display area AA1, the second display area AA2, and the third display area AA3 are not specifically limited, and may be set according to actual situations, and will not be described in detail below.
As shown in continued relation to fig. 13. In the driving method of the display device provided in this embodiment, the display device 300 shown in fig. 13 is driven, the display device 300 further includes a third display area AA3, and the third display area AA3 is located between the first display area AA1 and the second display area AA 2.
The method comprises the following steps:
step S201, in the threshold compensation stage: the second control terminal S2 in the first display area AA1 provides a first constant voltage signal, and the second control terminal S2 in the second display area AA2 provides a second constant voltage signal; the second control terminal S2 in the third display area AA3 provides a third constant voltage signal.
The voltage of the first constant voltage signal is less than that of the second constant voltage signal, so that the control terminal c0 of the driving module 3 in the first display area AA1 is lower than the control terminal c0 of the driving module 3 in the second display area AA2 when the threshold compensation phase is finished. The voltage of the third constant voltage signal is smaller than the voltage of the second constant voltage signal and larger than the voltage of the first constant voltage signal, so that when the threshold compensation phase is finished, the potential of the control terminal c0 of the driving module 3 in the third display area AA3 is lower than the potential of the control terminal c0 of the driving module 3 in the second display area AA2 and higher than the potential of the control terminal c0 of the driving module 3 in the first display area AA 1.
It is understood that, in the display apparatus 300, along the direction from the driving chip IC to the display area AA, the display area AA sequentially includes the second display area AA2, the third display area AA3 and the first display area AA1, that is, the power signal line L received by the second display area AA2, the third display area AA3 and the first display area AA1PVDDThe first supply voltage signal is provided to the first supply voltage input PVDD to be sequentially reduced. Thus, the voltage of the third constant voltage signal is set to be less than the voltage of the second constant voltage signal and greater than the voltage of the first constant voltage signal, so that the data writing capability of the second display area AA2, the third display area AA3 and the first display area AA1 is sequentially reduced, and the power signal line L is compensatedPVDDThe brightness is not uniform due to the voltage drop.
In some alternative embodiments, with reference to fig. 13, the voltage of the second constant voltage signal of the display device 300 is 0V, wherein the voltages of the first constant voltage signal and the third constant voltage signal are both negative values, and the first constant voltage signal is smaller than the third constant voltage signal.
It can be understood that, since the data writing capability of the threshold compensation module 2 is changed by the constant voltage signal provided by the second control terminal S2, the constant voltage signal provided by the second control terminal S2 can be used to compensate the first power voltage signal V provided by the first power voltage input terminal PVDD by providing different constant voltage signals to the second control terminals S2 of different pixel driving circuits 200 to fine-tune the potential of the control terminal c0 of each driving module 3 in the same writing timePVDDThe voltage drop problem of (2) makes the magnitude of the light-emitting signal current of the pixel driving circuit 200 similar, thereby solving the problem of non-uniform display. Further, the second display area AA2 is the display closest to the side of the driving chip ICIt can be seen that the second display area AA2 is supplied with the first power voltage signal V from the first power voltage input terminal PVDDPVDDHas less influence on the voltage drop, the first display area AA1 and the third display area AA3 provide the first power voltage signal VPVDDThe pressure drop influence is large.
Thus, the voltage of the second constant voltage signal may be set to 0V, both the first constant voltage signal and the third constant voltage signal may be at a negative potential, the voltage of the first constant voltage signal may be less than the voltage of the third constant voltage signal, and the absolute value of the voltage of the first constant voltage signal may be greater than the absolute value of the voltage of the third constant voltage signal. In the pixel driving circuit 200 in the first display area AA1 and the third display area AA3, the second control terminal S2, the input terminal a and the control terminal c22 of the threshold compensation module 2 input negative bias voltages to generate a vertical electric field to counteract the electric field generated by the first control terminal S1, so that the number of the attracted holes is reduced, and therefore, the current is correspondingly reduced, thereby reducing the data writing capability of the threshold compensation module 2; since the absolute value of the voltage of the first constant voltage signal is greater than the absolute value of the voltage of the third constant voltage signal, which is equivalent to that the data writing capability in the first display area AA1 is lower than that in the third display area AA3, the potential of the control terminal c0 of each driving module 3 is finely adjusted within the same writing time by providing different constant voltage signals to the second control terminals of different pixel driving circuits, so as to compensate the signal voltage drop received by the input terminal a0 of the driving module 3, so that the driving currents provided by each driving module 3 are similar, and thus the problem of display non-uniformity can be solved.
In some optional embodiments, with continuing reference to fig. 13, the driving method of the display device provided in this embodiment includes: when the voltage of the second constant voltage signal is 0V, the voltages of the first constant voltage signal and the third constant voltage signal are both negative values, and the first constant voltage signal is smaller than the third constant voltage signal.
It will be appreciated that, during the threshold compensation phase: the voltage of the second constant voltage signal may be set to 0V, both the first constant voltage signal and the third constant voltage signal are negative potential, the voltage of the first constant voltage signal is smaller than the voltage of the third constant voltage signal, and the absolute value of the voltage of the first constant voltage signal is larger than the absolute value of the voltage of the third constant voltage signal. The first control terminal S1 is configured to input a first scan signal, where the first scan signal is a square wave signal, and the first scan signal controls the threshold compensation module 2 to be turned on. The present invention does not make any specific requirement on the type of the oxide transistor M in the threshold compensation module 2, and in this embodiment, the oxide transistor M is only an N-type oxide transistor, and is turned on at the time when the first scan signal is at a high potential, so that the second control terminal S2 provides a constant voltage signal at this time, and the second control terminal S2, the input terminal a and the control terminal c22 of the threshold compensation module 2 input a negative bias voltage to generate a vertical electric field to counteract the electric field generated by the first control terminal S1, so as to reduce the number of the attracted holes, and therefore, the current is correspondingly reduced, thereby reducing the data writing capability of the threshold compensation module 2. In the constant voltage signals provided by the second display area AA2, the third display area AA3 and the first display area AA1, the voltage of the second constant voltage signal is 0V, the voltages of the first constant voltage signal and the third constant voltage signal are both negative values, and the first constant voltage signal is smaller than the third constant voltage signal, that is, the absolute values of the second constant voltage signal, the third constant voltage signal and the first constant voltage signal sequentially increase, which is equivalent to that the data writing capability of the second display area AA2, the third display area AA3 and the first display area AA1 sequentially decreases within the same time when the oxide transistor M is turned on. That is, different constant voltage signals are provided to the second control terminals of different pixel driving circuits, and the potential of the control terminal c0 of each driving module 3 is further finely adjusted within the same writing time, so as to compensate the voltage drop of the signal received by the input terminal a0 of the driving module 3, so that the driving currents provided by each driving module 3 are similar, and thus the problem of display non-uniformity can be solved.
In some optional embodiments, with continuing reference to fig. 13, the driving method of the display device provided in this embodiment includes: the voltage V1 of the first constant voltage signal satisfies-0.5V < V1<0V, and the voltage V2 of the second constant voltage signal satisfies 0V < V2 < 0.5V. It is to be understood that the first constant voltage signal is at a negative potential, the second constant voltage signal is at a positive potential, and the voltage of the third constant voltage signal is 0V, and further it may be defined that the voltage V1 of the first constant voltage signal satisfies-0.5V ≦ V1<0V, the voltage V2 of the second constant voltage signal satisfies 0V < V2 ≦ 0.5V, and the voltage of the third constant voltage signal is 0V. And then the difference range of the constant voltage signal of the second control end between every two adjacent display areas is 0-0.5 (0 is not included) and 0.5 is included), so that the problem that the brightness of the display area which is far away from the IC side after compensation is higher than that of other display areas due to over compensation can be avoided, namely, the brightness approximation of each display area after compensation is effectively ensured, and the brightness uniformity of the display device during display is realized.
In some alternative embodiments, as shown in fig. 14, fig. 14 is a schematic view of another display device provided by the present invention. The display device 300 of the present embodiment includes a display area AA and a non-display area BB surrounding the display area AA, wherein the non-display area BB includes a driving chip IC, and the voltage of the constant voltage signal provided by the second control terminal S2 gradually decreases along a first direction X, wherein the first direction X is parallel to a light-emitting surface (not shown) of the display device 300 and points from a side of the display device 300 close to the driving chip IC to a side of the display device away from the driving chip IC.
It can be understood that the voltage of the constant voltage signal provided by the second control terminal S2 gradually decreases along the first direction X. When the constant voltage signal is positive, the second control terminal S2, the input terminal a and the control terminal c22 of the threshold compensation module 2 input positive bias voltage to attract the holes to gather to form a conductive channel, and the oxide transistor M0 is driven to generate current, so that the data writing capability of the threshold compensation module 2 is gradually enhanced along the first direction X, that is, the voltage signal of the first node N1 is reduced, and the power signal line L in the first display region can be compensatedPVDDA low brightness due to a voltage drop. When the constant voltage signal is negative potential, the second control terminal S2, the input terminal a and the control terminal c22 of the threshold compensation module 2 input negative bias voltage to generate a vertical electric field to cancel the electric field generated by the first control terminal S1, so that the number of attracted holes is reduced, and therefore the current is reduced correspondingly, and the data writing capability of the threshold compensation module 2 is reduced along the first direction X, that is, the voltage signal of the first node N1 is reduced, and the power signal line L in the first display region can be compensatedPVDDA low brightness due to a voltage drop.
As can be seen from the foregoing embodiments, the pixel driving circuit, the driving method thereof, and the display device provided in the present invention at least achieve the following advantages:
compared with the prior art, the pixel driving circuit, the driving method thereof and the display device provided by the invention have the advantages that the pixel driving circuit comprises a data writing module, a threshold compensation module and a driving module, the threshold compensation module is used for writing a compensation signal into a control end of the driving module, the compensation signal is used for carrying out threshold compensation on the driving module, the threshold compensation module comprises a first control end and a second control end, the first control end is used for inputting a first scanning signal, and the second control end is used for providing a constant voltage signal at part of time. According to the invention, the threshold compensation module comprises the first control end and the second control end, the data writing capability of the threshold compensation module is controlled by combining the electric field generated by the second control end with the electric field generated by the first control end, and the voltage of the control end of the driving module is further adjusted to compensate different voltage difference values between the input end and the control end of the driving module, so that the driving currents provided by the driving module are similar, and the problem of uneven display can be solved.
Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims (15)

1. A pixel driving circuit, comprising:
the device comprises a data writing module, a threshold compensation module and a driving module, wherein the driving module comprises an input end, an output end and a control end;
the data writing module is used for writing a data signal into the input end of the driving module;
the threshold compensation module is used for writing a compensation signal into the control end of the driving module, the compensation signal is used for threshold compensation of the driving module, the threshold compensation module comprises a first control end and a second control end, the first control end is used for inputting a first scanning signal, and the second control end is used for providing a constant voltage signal at a part of time;
the driving module is used for providing a driving current according to the data signal and the compensation signal.
2. The pixel driving circuit according to claim 1, wherein the driving module comprises a driving transistor comprising an input terminal, an output terminal, and a control terminal;
the control end of the driving transistor is connected to the first node, the input end of the driving transistor is connected to the second node, and the output end of the driving transistor is connected to the third node;
the first node is connected to the output end of the threshold compensation module, the second node is connected to the output end of the data writing module, and the third node is connected to the input end of the threshold compensation module.
3. The pixel driving circuit according to claim 2, further comprising a light emission control module including a first transistor and a second transistor;
the control end of the first transistor is connected to the light-emitting signal input end, the input end of the first transistor is connected to the first power supply voltage input end, and the output end of the first transistor is connected to the second node;
the control end of the second transistor is connected to the light-emitting signal input end, the input end of the second transistor is connected to the third node, and the output end of the second transistor is connected to the fourth node.
4. The pixel driving circuit according to claim 2, further comprising a storage module including a storage capacitor;
one end of the storage capacitor is connected to a first power supply voltage input end, and the other end of the storage capacitor is connected to the first node.
5. The pixel driving circuit according to claim 2, further comprising a reset module including a third transistor and a fourth transistor;
the third transistor, whose control end is connected to the first scanning signal input end, whose input end is connected to the reference voltage signal end, and whose output end is connected to the first node, initializes the first node;
and the control end of the fourth transistor is connected to the second scanning signal input end, the input end of the fourth transistor is connected to the reference voltage signal end, the output end of the fourth transistor is connected to a fourth node, and the fourth node is initialized.
6. The pixel driving circuit of claim 2, wherein the threshold compensation module comprises an oxide transistor,
the oxide transistor comprises a first grid electrode, a second grid electrode, an input end and an output end, the first grid electrode is connected with the first control end, the second grid electrode is connected with the second control end, the input end of the oxide transistor is connected to the output end of the driving module, and the output end of the oxide transistor is connected to the control end of the driving module.
7. A display device comprising the pixel driving circuit according to any one of claims 1 to 6, further comprising a light emitting element having one end connected to a fourth node in the pixel driving circuit and the other end connected to a second power supply voltage input terminal.
8. The display device according to claim 7, comprising a display area and a non-display area surrounding the display area, wherein the non-display area comprises a driver chip, and the display area comprises a first display area and a second display area, and the second display area is located between the first display area and the driver chip;
the second control terminal in the first display region is used for providing a first constant voltage signal at a partial moment, and the second control terminal in the second display region is used for providing a second constant voltage signal at a partial moment, wherein the voltage of the first constant voltage signal is less than that of the second constant voltage signal.
9. The display device of claim 8, wherein the display area further comprises a third display area, the third display area being located between the first display area and the second display area;
the second control terminal in the third display region is configured to provide a third constant voltage signal at a portion of the time, wherein the voltage of the third constant voltage signal is less than the voltage of the second constant voltage signal and greater than the voltage of the first constant voltage signal.
10. The display device according to claim 9, wherein the voltage of the second constant voltage signal is 0V.
11. The display device according to claim 7, comprising a display area and a non-display area surrounding the display area, wherein the non-display area comprises a driving chip, and the voltage of the constant voltage signal provided by the second control terminal gradually decreases along a first direction, wherein the first direction is parallel to the light emitting surface of the display device and is directed from a side of the display device close to the driving chip to a side away from the driving chip.
12. A driving method of a display device for driving the display device as claimed in claim 7, wherein the display device comprises a display area and a non-display area surrounding the display area, the non-display area comprising a driving chip, the display area comprising a first display area and a second display area, the second display area being located between the first display area and the driving chip;
the method comprises the following steps:
in the threshold compensation stage: the second control terminal in the first display area provides a first constant voltage signal, and the second control terminal in the second display area provides a second constant voltage signal;
the voltage of the first constant voltage signal is smaller than that of the second constant voltage signal, so that when the threshold compensation stage is finished, the control end potential of the driving module in the first display area is lower than that of the driving module in the second display area.
13. The driving method according to claim 12, wherein the display region further includes a third display region, the third display region being located between the first display region and the second display region;
in the threshold compensation stage: the second control terminal in the third display area provides a third constant voltage signal;
wherein the voltage of third constant voltage signal is less than the voltage of second constant voltage signal, and is greater than the voltage of first constant voltage signal, when making threshold value compensation stage end, in the third display area drive module's control end potential is less than in the second display area drive module's control end potential, and is higher than in the first display area drive module's control end potential.
14. The driving method according to claim 13, wherein when the voltage of the second constant voltage signal is 0V, the voltages of the first constant voltage signal and the second constant voltage signal are both negative values, and the first constant voltage signal is smaller than the second constant voltage signal.
15. The driving method as claimed in claim 14, wherein the voltage V of the first constant voltage signal1V is less than or equal to-0.5V1<0V, voltage V of the second constant voltage signal2Satisfies 0V<V2≤0.5V。
CN202011534523.6A 2020-12-23 2020-12-23 Pixel driving circuit, driving method thereof and display device Pending CN112669748A (en)

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KR20150071366A (en) * 2013-12-18 2015-06-26 엘지디스플레이 주식회사 Organic light emitting display device with compensation function
CN104809989A (en) * 2015-05-22 2015-07-29 京东方科技集团股份有限公司 Pixel circuit, drive method thereof and related device
CN108877650A (en) * 2017-05-12 2018-11-23 京东方科技集团股份有限公司 Pixel-driving circuit, driving compensation method, display base plate and display device
CN111754939A (en) * 2020-07-28 2020-10-09 京东方科技集团股份有限公司 Pixel circuit, driving method thereof and display device

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20150071366A (en) * 2013-12-18 2015-06-26 엘지디스플레이 주식회사 Organic light emitting display device with compensation function
CN104575398A (en) * 2015-02-10 2015-04-29 京东方科技集团股份有限公司 Pixel circuit, driving method thereof and display device
CN104809989A (en) * 2015-05-22 2015-07-29 京东方科技集团股份有限公司 Pixel circuit, drive method thereof and related device
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