CN112669748B - Pixel driving circuit, driving method thereof and display device - Google Patents
Pixel driving circuit, driving method thereof and display device Download PDFInfo
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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 data signals into the input end of the driving module; the threshold compensation module is used for writing compensation signals into a control end of the driving module, the compensation signals are 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 constant voltage signals at partial moments; and the driving module is used for providing 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 constant voltage signals at partial moments, so that the problem that the display uniformity is affected by different driving currents due to different voltage differences between the input end and the control end of the driving module is further compensated.
Description
Technical Field
The present invention relates to the field of display technologies, and 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 display as required. A pixel circuit generally includes a light emission control module, an initialization module, a data writing module, and the like, which are composed of a capacitor and a plurality of thin film transistors, wherein 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 at which the power supply signal passes through the VDD line varies, that is, the voltage at which the VDD line is supplied to the pixel circuits connected thereto varies from place to place. 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 supply signal (VDD), IRDrop can cause different gate-source voltages of the driving modules in the pixel circuits at different positions, and further cause 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 this, 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 thereof is used for providing a constant voltage signal at a part of time, so as to compensate for the problem that the difference in voltage difference between an input terminal and a control terminal of the driving module causes the difference in driving current to affect the display uniformity.
In one aspect, the present invention provides 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 data signals 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 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;
the driving module is used for providing driving current according to the data signal and the compensation signal.
In yet another aspect, the present application provides a display device including any one of the pixel driving circuits provided by the present application. The pixel driving circuit further comprises a light emitting element, one end of the light emitting element is connected to a fourth node in the pixel driving circuit, and the other end of the light emitting element is connected to a second power supply voltage input end.
In still another aspect, the present invention provides a driving method of a display device, for the display device described above, the display device including a display area and a non-display area surrounding the display area, the non-display area including a driving chip, the display area including 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 phase: the second control end in the first display area provides a first constant voltage signal, and the second control end 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 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 when the threshold compensation phase is finished.
Compared with the prior art, the pixel driving circuit, the driving method and the display device thereof provided by the invention have the advantages that the pixel driving circuit comprises the data writing module, the threshold compensation module and the driving module, the threshold compensation module is used for writing compensation signals into the control end of the driving module, the compensation signals are used for carrying out threshold compensation on the driving module, the threshold compensation module comprises the first control end and the second control end, the first control end is used for inputting the first scanning signals, and the second control end is used for providing constant voltage signals at partial moments. The threshold compensation module comprises the first control end and the second control end, the data writing capacity of the threshold compensation module is controlled by combining the electric field generated by the second control end and the electric field generated by the first control end, and the voltage of the control end of the driving module is regulated so as to compensate the difference of the voltage between the input end of the driving module and the control end, so that the driving current provided by the driving module is similar, and the problem of uneven display can be solved.
Of course, it is not necessary for any one product embodying the invention to achieve all of the above technical effects at the same time.
Other features of the present invention and its advantages will become apparent from the following detailed description of exemplary embodiments of the invention, 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 diagram of a pixel driving circuit according to the present invention;
FIG. 3 is a schematic diagram of a pixel driving circuit according to another embodiment of 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 diagram of a pixel driving circuit according to another embodiment of 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 diagram of a pixel driving circuit according to another embodiment of the present invention;
FIG. 9 is a schematic diagram 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 diagram of another display device according to the present invention;
FIG. 12 is a flow chart of a method of driving a display device;
FIG. 13 is a schematic view of a display device according to another embodiment of the present invention;
fig. 14 is a schematic view of another display device according to 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, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise.
The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods, and apparatus should be considered part of the specification.
In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of exemplary embodiments may have different values.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
Referring to fig. 1, fig. 1 is a schematic diagram of a prior art pixel driving circuit. In the pixel driving circuit 100 in the prior art, the pixel driving circuit comprises a data writing module 01, a threshold compensation module 02 and a driving module 03, wherein the driving module 03 comprises an input end a01, an output end b01 and a control end c01; a data writing module 01 for writing a data signal into an input terminal 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, the compensation signal is configured 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 configured to input a first scan signal, and the driving module 03 is configured to provide a driving current according to the 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, the reset voltage signal terminal Vref sends 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 a data signal provided by the data signal terminal Vdata is sent to the second node N2, the second node N2 sends the data signal to the driving module 03, and since the driving module 03 has a threshold voltage, the voltage sent to the third node N3 is the data signal minus the threshold voltage value, and the voltage is sent to the first node through the threshold compensation module 02 until the voltage of the control terminal c0 of the driving transistor 03 is the threshold voltage, the input terminal Vin sequentially sends the input signal to the second node N2, the driving module 03, the third node N3, and the output terminal Vout. However, since the input signal from the input terminal Vin has a voltage drop problem, the signal outputted to the output terminal Vout is different, which may result in uneven display.
In order to solve the above technical problems, the present invention provides a pixel driving circuit, a driving method thereof and a display device. Embodiments of the pixel driving circuit, the driving method thereof and the display device provided by the invention are described in detail below.
In this embodiment, please refer to fig. 2, fig. 2 is a schematic diagram of a pixel driving circuit according to the present invention. The pixel driving circuit 200 in the present embodiment includes: the device comprises a data writing module 1, a threshold compensation module 2 and a driving module 3, wherein the driving module 3 comprises an input end a0, an output end b0 and a control end c0; a data writing module 1 for writing a data signal into an input terminal 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, the compensation signal is configured 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 configured to input a first scan signal, and the second control terminal S2 is configured to provide a constant voltage signal at a part of time; and a driving module 3 for providing a driving current according to the data signal and the compensation signal.
The second control terminal S2 is configured to provide a constant voltage signal at a part of time, that is, in a period of time when the first control terminal S1 inputs the first scan signal to control the threshold compensation module 2 to start to perform threshold compensation, the second control terminal S2 is configured to provide the constant voltage signal at the part of time.
Optionally, the pixel driving circuit 200 further includes an input terminal Vin, an output terminal Vout, and a reset signal input terminal Vref, where the input terminal Vin is used for providing an input signal, the output terminal Vout is used for outputting an output signal, and the reset signal input terminal Vref is used for providing an initialization signal, and initializing 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 input at the first control terminal S1 to control the threshold compensation module 2 to start threshold compensation, and in the threshold compensation period, the second control terminal S2 is configured to provide a constant voltage signal, that is, change the data writing capability of the threshold compensation module 2 by using the constant voltage signal provided by the second control terminal, and provide different constant voltage signals to the second control terminals in different pixel driving circuits, so as to micro-adjust 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, and thus the problem that the input signal voltage drop provided by the input terminal Vin affects the output signal output by the output terminal Vout can be solved, and the problem of uneven display can be further solved. The driving currents provided by the driving modules 3 can be similar, the invention is not limited to the driving currents provided by the driving modules 3 being equal, and only the driving currents provided by the driving modules 3 are required to be similar, so that obvious differences can not be observed by human eyes.
In some alternative embodiments, as shown in fig. 3, fig. 3 is a schematic diagram of a pixel driving circuit according to another embodiment of the present invention. The pixel driving circuit 200 in the present embodiment includes: the driving module comprises a driving transistor M0, and the driving transistor M0 comprises an input end a0, an output end b0 and a control end c0; the control terminal c0 of the driving transistor M0 is connected to the first node N1, the input terminal a0 is connected to the second node N2, and the output terminal b0 is connected to the third node N3; the first node N1 is connected to the output b of the threshold compensation module 2, the second node N2 is connected to the output b data of the data writing module 1, and the third node N3 is connected to the input a of the threshold compensation module 2.
It will be appreciated that the driving module 3 includes a driving transistor M0, and the driving transistor M0 includes an input terminal a0, an output terminal b0, and a control terminal c0; 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, the first node N1 is connected to the output terminal b of the threshold compensation module 2, that is, the voltage signal of 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 electric potential of the control terminal c0 through the electric 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, the second node N2 is connected to the output terminal b data of the data writing module 1, and the output terminal b0 thereof 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 at the first control terminal S1 to control the threshold compensation module 2 to start threshold compensation, in the threshold compensation period, the second control terminal S2 is configured to provide a constant voltage signal, and the constant voltage signal provided by the second control terminal is utilized to change the data writing capability of the threshold compensation module 2, and by providing different constant voltage signals to the second control terminals in different pixel driving circuits, the potential of the control terminal c0 of each driving module 3 is finely adjusted 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 currents provided by each driving module 3 are similar, thereby solving the problem of uneven display.
In some alternative embodiments, as shown in fig. 4, fig. 4 is a schematic structural diagram of a pixel driving circuit according to another embodiment of the present invention. The pixel driving circuit 200 in the present embodiment further includes a light emission control module 4, the light emission control module 4 including a first transistor M1 and a second transistor M2; a first transistor M1 having a control terminal c1 connected to the emission signal input terminal Emit, an input terminal a1 connected to the first power supply voltage input terminal PVDD, and an output terminal b1 connected to the second node N2; the second transistor M2 has its control terminal c2 connected to the emission signal input terminal Emit, its input terminal a2 connected to the third node N3, and its output terminal b2 connected to the fourth node N4.
It will be appreciated that the pixel driving circuit 200 further includes a light emission control module 4, and the light emission control module 4 is configured to provide a light emission signal. The light emission control module 4 includes a first transistor M1 and a second transistor M2; the control ends of the first transistor M1 and the second transistor M2 are both connected to the light emitting signal input end Emit, that is, the on-off condition of the first transistor M1 and the second transistor M2 is controlled by the forensic signal provided by the light emitting signal input end Emit, further, when the first transistor M1 and the second transistor M2 are turned on, the first power voltage signal provided by the first power voltage input end PVDD sequentially passes through the first transistor M2, the second node N2, the driving transistor M0, and the second transistor M2 to the fourth node N4. The pixel driving circuit 200 emits light with the magnitude i=kv PVDD-(Vdata-Vth)-|Vth|]2, where K is a constant, V PVDD is a first power voltage signal provided by the first power voltage input terminal PVDD, V N1 is a voltage signal at the position of the first node N1, and V th is a compensation signal. Since the voltage drop problem of the first power voltage signal V PVDD provided by the first power voltage input end PVDD causes the first power voltage signal V PVDD to be changed, the first power voltage signal V PVDD is converted into V PVDD±VΔ1, and the driving current of the pixel driving circuit 200 at different positions is changed, so that the display is nonuniform. Therefore, the threshold compensation module 2 is provided in the present application, the threshold compensation module 2 inputs the first scan signal to control the threshold compensation module 2 to start threshold compensation, in the threshold compensation period, the second control terminal S2 is used 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 by providing different constant voltage signals to the second control terminal in different pixel driving circuits, the potential of the control terminal c0 of each driving module 3 is further micro-adjusted in the same writing time, so that the potential of the control terminal c0 is converted from V data-Vth to V data-Vth ±Δv, the magnitude of the light emitting signal current of the pixel driving circuit 200 at this time is converted into I＝K[(VPVDD±ΔV')-(Vdata-Vth±ΔV)-Vth]2＝K[(VPVDD-Vdata)±(ΔV'-ΔV)]2,, and the constant voltage signal provided by the second control terminal S2 can be used to compensate the voltage drop problem of the first power voltage signal V PVDD provided by the first power voltage input terminal PVDD, so that the magnitude of the light emitting signal current of the pixel driving circuit 200 is similar, thereby solving the problem of non-uniform display.
In some alternative embodiments, as shown in fig. 5, fig. 5 is a schematic diagram of a pixel driving circuit according to another embodiment of the present invention. The pixel driving circuit 200 in the present embodiment further includes a reset module 6, the reset module 6 including a third transistor M3 and a fourth transistor M4; the control terminal c3 of the third transistor M3 is connected to the first SCAN signal input terminal SCAN1, the input terminal a3 thereof is connected to the reference voltage signal terminal Vref, the output terminal b3 thereof is connected to the first node N1, and the first node N1 is initialized; the control terminal c4 of the fourth transistor M4 is connected to the second SCAN signal input terminal SCAN2, the input terminal a4 thereof is connected to the reference voltage signal terminal Vref, and the output terminal b4 thereof is connected to the fourth node N4, so as to initialize the fourth node N4.
It can be understood that, when the first SCAN signal input 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 second SCAN signal input SCAN2 controls the fourth transistor M4 to be turned on, 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, as shown in fig. 6, fig. 6 is a schematic structural diagram of a pixel driving circuit according to another embodiment of 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 the first power voltage input end PVDD, and the other end thereof is connected to the first node N1.
It can be understood that the electric charges are forced to move in the electric field, when a medium exists between the conductors, the movement of the electric charges is blocked, so that the electric charges are accumulated on the conductors, and accumulated storage of the electric charges is caused, the storage capacitor Cst can store the electric charges, and the storage capacitor Cst is used for keeping the voltage signal of the first node N1, that is, the first node N1 keeps 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 keep the on state continuously for writing data.
In some alternative embodiments, as shown in fig. 7, fig. 7 is a schematic diagram of a structure of a pixel driving circuit according to another embodiment of the present invention. The threshold compensation module 2 of the pixel driving circuit 200 in this embodiment includes an oxide transistor M, where the oxide transistor M includes a first gate S1, a second gate S2, an input terminal a and an output terminal b, the first gate c11 is connected to the first control terminal S1, the second gate c22 is connected to the second control terminal S2, the input terminal a of the oxide transistor M is connected to the output terminal b0 of the driving module 3, and the output terminal b of the oxide transistor M is connected to the control terminal c0 of the driving module 3.
It can be understood that the first gate c11 is connected to the first control terminal S1, and the first control terminal S1 is used for inputting a 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, and the second control terminal S2 is used for providing a constant voltage signal at a part of time. When the oxide transistor M is turned on, a 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 on time and the on current of the oxide transistor M, and the longer the on time is, the larger the on current is; the more fully the voltage signal of 3 at the third node N is written to the voltage signal at the first node N1. The second control terminal S2 is configured to provide a constant voltage signal, and the constant voltage signal provided by the second control terminal is used to change the data writing capability of the threshold compensation module 2, so that the voltage of the control terminal c0 of each driving module 3 is slightly adjusted within the same writing time by providing different constant voltage signals to the second control terminals in different pixel driving circuits, and the variation of the power voltage signal V PVDD can be compensated by the variation of the voltage of the control terminal c0 at this time, so that the constant voltage signal provided by the second control terminal S2 can be used to compensate the voltage drop problem of the first power voltage signal V PVDD provided by the first power voltage input terminal PVDD, so that the magnitude of the light-emitting signal current of the pixel driving circuit 200 is similar, and the problem of uneven display can be solved.
In some alternative embodiments, as shown in fig. 8, fig. 8 is a schematic structural diagram of a pixel driving circuit according to another embodiment of the present invention. The data writing module 1 in the pixel driving circuit 200 of the present embodiment includes a fifth transistor M5, the control terminal c5 of the fifth transistor M5 is connected to the second SCAN signal input terminal SCAN2, the input terminal a5 thereof is connected to the data signal input terminal Vdata, the output terminal b5 thereof corresponds to the output terminal b data of the data writing module 1, and the output terminal b5 thereof is connected to the second node N2.
It can be understood that the second SCAN signal provided by the second SCAN signal input SCAN2 controls whether the fifth transistor M5 is turned on, and when the fifth transistor M5 is turned on, the data signal provided by the data signal input Vdata is written into the second node N2, so that the third node N3 and the first node N1 are sequentially written therein, thereby completing the threshold compensation of the pixel driving circuit 200.
The present invention further provides a display device 300, and fig. 9 and 10 are combined, wherein fig. 9 is a schematic diagram 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 includes the pixel driving circuit 200 provided in any of the above embodiments of the present 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 the second power supply voltage input terminal PVEE.
It is understood that the display device 300 further includes a power signal line L PVDD for providing the first power voltage signal to the first power voltage input terminal PVDD, because of a certain resistance of the power signal line L PVDD. Therefore, the loss of the signal existing in the power signal line L PVDD, that is, the loss of the power signal line L PVDD increases gradually in the direction away from the input end of the power signal line L PVDD and toward the output end, that is, in the direction of the J and I, so that the power signal line L PVDD provides the first power voltage signal to the first power voltage input end PVDD to decrease gradually, which results in that the magnitude of the light emitting signal current received by the light emitting element O decreases gradually, and the brightness uniformity of the display device 300 is affected.
And since the pixel driving circuit 200 emits the light signal current of the magnitude i=k [ V PVDD-(Vdata-Vth)-|Vth|]2, where K is a constant, V PVDD is the first power voltage signal provided by the first power voltage input terminal PVDD, V N1 is the voltage signal at the position of the first node N1, and V th is the compensation signal. Since the voltage drop problem of the first power voltage signal V PVDD provided by the first power voltage input end PVDD causes the first power voltage signal V PVDD to be changed, the first power voltage signal V PVDD is converted into V PVDD±VΔ1, and the driving current of the pixel driving circuit 200 at different positions is changed, so that the display is nonuniform. Therefore, the threshold compensation module 2 is provided in the present application, the threshold compensation module 2 inputs the first scan signal to control the threshold compensation module 2 to start threshold compensation, in the threshold compensation period, the second control terminal S2 is used 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 by providing different constant voltage signals to the second control terminal in different pixel driving circuits, the potential of the control terminal c0 of each driving module 3 is further micro-adjusted in the same writing time, so that the potential of the control terminal c0 is converted from V data-Vth to V data-Vth ±Δv, the magnitude of the light emitting signal current of the pixel driving circuit 200 at this time is converted into I＝K[(VPVDD±ΔV')-(Vdata-Vth±ΔV)-Vth]2＝K[(VPVDD-Vdata)±(ΔV'-ΔV)]2,, and the constant voltage signal provided by the second control terminal S2 can be used to compensate the voltage drop problem of the first power voltage signal V PVDD provided by the first power voltage input terminal PVDD, so that the magnitude of the light emitting signal current of the pixel driving circuit 200 is similar, thereby solving the problem of non-uniform display.
In some alternative embodiments, as shown in connection with fig. 11, fig. 11 is a schematic diagram of yet another display device provided by the present invention. The display device 300 provided in this 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 configured to provide a first constant voltage signal at a part of the time, and the second control terminal S2 in the second display area AA2 is configured to provide a second constant voltage signal at a part of the time, wherein the voltage of the first constant voltage signal is smaller than the voltage of the second constant voltage signal.
The number of the pixel driving circuits 200 included in the first display area AA1 and the second display area AA2 is not particularly limited, and may be set according to practical situations, and will not be described in detail.
In some alternative embodiments, as further shown in connection with fig. 10, 11 and 12, fig. 12 is a flow chart of a method of driving 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 phase: 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 smaller than that of the second constant voltage signal, so that the potential of the control terminal c0 of the driving module 3 in the first display area AA1 is lower than that of the control terminal c0 of the driving module 3 in the second display area AA2 when the threshold compensation phase is ended.
Optionally, the method further comprises a reset phase: when the first SCAN signal input SCAN1 of the pixel driving circuit 200 in the display area AA1 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 at this time, the voltage signal of the first node N1 is the reference voltage signal, and 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 end SCAN2 controls the fifth transistor M5 to be turned on, the data signal is written into the second node N2, the first node N1 can control the driving transistor M0 to keep on under the action of the storage capacitor Cst, the data signal is written into the third node through the driving transistor M0, the first control end S1 inputs the first SCAN signal oxide transistor M to be turned on, the data signal is written into the first node N1 through the peroxide transistor M0, the constant voltage signal can be provided by the second control end S2, the data writing capability of the threshold compensation module 2 is changed by the constant voltage signal provided by the second control end, the potential of the control end c0 of each driving module 3 is further micro-adjusted in the same writing time by providing different constant voltage signals for the second control end in different pixel driving circuits, the variable quantity of the power voltage signal V PVDD can be compensated by the variable quantity of the potential of the control end c0, the second control end S2 can further provide a constant voltage signal which is provided by the constant voltage signal dd of the first control end dd, the first control end dd can provide a large voltage signal, the constant voltage signal PVDD is different from the first pixel driving circuit, and the problem of the first pixel is solved, and the problem of the voltage signal is solved, the voltage of the first signal is not similar, and the voltage of the first voltage signal is displayed, the voltage signal is displayed, and the voltage is low, the voltage is the voltage 200, and the voltage is low, the voltage is the voltage can and the signal is the voltage.
Further, since the second display area AA2 is located between the first display area AA1 and the driving chip IC, the power signal line L PVDD received by the first display area AA1 provides the first power voltage signal for the first power voltage input end PVDD smaller than the first power voltage signal provided by the second display area AA2 power signal line L PVDD for the first power voltage input end PVDD, so that the first display area AA1 needs to reduce the potential of the control end c0 of the driving module 3 relatively more than the second display area AA2 for compensating the difference between the first power voltage signal received by the first display area AA1 and the first power voltage signal of the second display area AA2, the first display area AA1 needs to have a stronger capability of compensating the electric field generated by the electric field S2 generated by the second control end of the threshold compensation module 2 in the first display area AA2, and further the second control end S2 in the first display area AA1 needs to provide the first constant voltage signal smaller than the second control end S2 in the second display area AA2 for providing the second constant voltage signal at a part of time.
In some alternative embodiments, as shown in connection with fig. 13, fig. 13 is a schematic view of yet 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, where 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 configured to provide a third constant voltage signal at a part of time, where the voltage of the third constant voltage signal is smaller than the voltage of the second constant voltage signal and greater than the voltage of the first constant voltage signal.
The number of the pixel driving circuits 200 included in the first display area AA1, the second display area AA2, and the third display area AA3 is not particularly limited, and may be set according to practical situations, and will not be described in detail.
And continues to be shown in connection with fig. 13. In the driving method of the display device provided in the embodiment, the display device 300 shown in fig. 13 is driven, the display device 300 includes a display area AA and 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 phase: 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 smaller than that of the second constant voltage signal, so that the potential of the control terminal c0 of the driving module 3 in the first display area AA1 is lower than that of the control terminal c0 of the driving module 3 in the second display area AA2 when the threshold compensation phase is ended. 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 the potential of the control end c0 of the driving module 3 in the third display area AA3 is lower than the potential of the control end c0 of the driving module 3 in the second display area AA2 and higher than the potential of the control end c0 of the driving module 3 in the first display area AA1 when the threshold compensation phase is finished.
It can be understood that, in the display device 300, along the direction in which the driving chip IC points 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 lines L PVDD received by the second display area AA2, the third display area AA3, and the first display area AA1 provide the first power voltage signal for the first power voltage input end PVDD to sequentially decrease. Therefore, the voltage of the third constant voltage signal is smaller than that of the second constant voltage signal and larger than that of the first constant voltage signal, so that the data writing capacity of the second display area AA2, the third display area AA3 and the first display area AA1 is sequentially reduced, and the problem of uneven brightness caused by the voltage drop of the power signal line L PVDD is further solved.
In some alternative embodiments, as further shown in fig. 13, the voltage of the second constant voltage signal of the display device 300 provided in this embodiment is 0V, where the voltages of the first constant voltage signal and the third constant voltage signal are both negative, and the first constant voltage signal is smaller than the third constant voltage signal.
It can be understood that, because the constant voltage signal provided by the second control terminal S2 is used to change the data writing capability of the threshold compensation module 2, by providing different constant voltage signals to the second control terminals S2 in different pixel driving circuits 200, the potential of the control terminal c0 of each driving module 3 is further micro-adjusted within the same writing time, and then the constant voltage signal provided by the second control terminal S2 can be used to compensate the voltage drop problem of the first power voltage signal V PVDD provided by the first power voltage input terminal PVDD, so that the magnitude of the light emitting signal current of the pixel driving circuit 200 is similar, and the problem of uneven display can be solved. Further, the second display area AA2 is the display area closest to the driver IC, so that the second display area AA2 is less affected by the voltage drop of the first power voltage signal V PVDD provided by the first power voltage input end PVDD, and the voltage drop of the first power voltage signal V PVDD provided by the first display area AA1 and the third display area AA3 is more affected.
Thus, the voltage of the second constant voltage signal may be set to 0V, the first constant voltage signal and the third constant voltage signal are both negative potentials, 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. In the pixel driving circuits 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 vertical electric fields, so as to offset the electric fields generated by the first control terminal S1, thereby reducing the number of holes to be attracted, and accordingly reducing the current, and further reducing the data writing capability of the threshold compensation module 2; because the absolute value of the voltage of the first constant voltage signal is larger than that of the third constant voltage signal, and the data writing capacity in the first display area AA1 is lower than that in the third display area AA3, the potential of the control end c0 of each driving module 3 is slightly adjusted in the same writing time by providing different constant voltage signals for the second control ends in different pixel driving circuits, so that the signal voltage drop received by the input end a0 of each driving module 3 is compensated, and the driving current provided by each driving module 3 is similar, thereby solving the problem of uneven display.
In some alternative embodiments, with continued 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 negative, and the first constant voltage signal is smaller than the third constant voltage signal.
It can be appreciated that in the threshold compensation phase: the voltage of the second constant voltage signal may be set to 0V, the first constant voltage signal and the third constant voltage signal are both negative potentials, 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. In the embodiment, only the oxide transistor M is an N-type oxide transistor, and when the first scanning signal is at a high potential, the second control terminal S2 provides a constant voltage signal, the second control terminal S2 of the threshold compensation module 2 inputs a negative bias voltage to generate a vertical electric field, and the electric field generated by the first control terminal S1 is offset, so that the number of holes attracted is reduced, and the current is correspondingly reduced, thereby reducing the data writing capability of the threshold compensation module 2. Because 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 all negative, 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 are sequentially increased, which is equivalent to that the second display area AA2, the third display area AA3 and the first display area AA1 are sequentially reduced in the same time when the oxide transistor M is turned on. Namely, by providing different constant voltage signals to the second control ends in different pixel driving circuits, the potential of the control end c0 of each driving module 3 is micro-adjusted in the same writing time, so as to compensate the signal voltage drop received by the input end a0 of the driving module 3, so that the driving current provided by each driving module 3 is similar, and the problem of uneven display can be solved.
In some alternative embodiments, with continued 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 is less than or equal to-0.5V and less than or equal to V1 and less than 0V, and the voltage V2 of the second constant voltage signal is less than or equal to 0V and less than or equal to 0.5V. It is understood that the first constant voltage signal is negative, the second constant voltage signal is positive, 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-0.5 v+.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 the difference range of the constant voltage signals of the second control end between every two adjacent display areas is 0-0.5 (excluding 0 and 0.5), so that the problem that the brightness of the compensated display area far away from the side of the IC is higher than that of other display areas due to overcompensation can be avoided, namely the brightness approximation of each compensated display area is effectively ensured, and the brightness uniformity of the display device during display is realized.
In some alternative embodiments, as shown in connection with fig. 14, fig. 14 is a schematic view of yet another display device provided by the present invention. The display device 300 provided in this embodiment includes a display area AA and a non-display area BB surrounding the display area AA, 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 is gradually reduced along the first direction X, where the first direction X is parallel to the light emitting surface (not shown in the figure) of the display device 300, and the side of the display device 300 close to the driving chip IC is directed away from the driving chip IC.
It will be appreciated 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 of the threshold compensation module 2 inputs a positive bias voltage, and the input terminal a and the control terminal c22 attract holes to gather to form a conductive channel, so as to drive the oxide transistor M0 to generate a current, which is equivalent to gradually reducing the data writing capability of the enhanced threshold compensation module 2 along the first direction X, i.e. reducing the voltage signal of the first node N1, and further compensating the problem of low brightness of the first display area caused by the voltage drop of the power signal line L PVDD. When the constant voltage signal is negative, 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, so as to offset the electric field generated by the first control terminal S1, thereby reducing the number of holes attracted, and accordingly reducing the current, so that 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 problem of low brightness of the first display area caused by the voltage drop of the power signal line L PVDD can be compensated.
As can be seen from the above embodiments, the pixel driving circuit, the driving method thereof and the display device provided by the invention at least realize the following beneficial effects:
Compared with the prior art, the pixel driving circuit, the driving method and the display device thereof provided by the invention have the advantages that the pixel driving circuit comprises the data writing module, the threshold compensation module and the driving module, the threshold compensation module is used for writing compensation signals into the control end of the driving module, the compensation signals are used for carrying out threshold compensation on the driving module, the threshold compensation module comprises the first control end and the second control end, the first control end is used for inputting the first scanning signals, and the second control end is used for providing constant voltage signals at partial moments. The threshold compensation module comprises the first control end and the second control end, the data writing capacity of the threshold compensation module is controlled by combining the electric field generated by the second control end and the electric field generated by the first control end, and the voltage of the control end of the driving module is regulated so as to compensate the difference of the voltage between the input end of the driving module and the control end, so that the driving current provided by the driving module is similar, and the problem of uneven display can be solved.
While certain specific embodiments of the invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the 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 for driving a light emitting element in a display device, the display device including a display region and a non-display region surrounding the display region, the non-display region including a driving chip, the display region including a first display region and a second display region, the second display region being located between the first display region and the driving chip;
Comprising the following steps: 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 data signals 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 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;
the driving module is used for providing driving current according to the data signal and the compensation signal;
One end of the light-emitting element is connected to the pixel driving circuit, and the other end of the light-emitting element is connected to a second power supply voltage input end;
The second control terminal in the first display area is used for providing a first constant voltage signal at a part of time, and the second control terminal in the second display area is used for providing a second constant voltage signal at a part of time, wherein the voltage of the first constant voltage signal is smaller than that of the second constant voltage 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 memory module including a storage capacitor;
One end of the storage capacitor is connected to the 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 control end of the third transistor is connected to the first scanning signal input end, the input end of the third transistor is connected to the reference voltage signal end, the output end of the third transistor is connected to the first node, and the first node is initialized;
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 according to 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, wherein 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 a pixel driving circuit according to any one of claims 1-6, 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.
8. The display device according to claim 7, comprising a display region and a non-display region surrounding the display region, the non-display region comprising a driving chip, the display region comprising a first display region and a second display region, the second display region being located between the first display region and the driving chip;
The second control terminal in the first display area is used for providing a first constant voltage signal at a part of time, and the second control terminal in the second display area is used for providing a second constant voltage signal at a part of time, wherein the voltage of the first constant voltage signal is smaller 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 area is configured to provide a third constant voltage signal at a part of time, where a voltage of the third constant voltage signal is smaller than a voltage of the second constant voltage signal and greater than a voltage of the first constant voltage signal.
10. The display device according to claim 9, wherein a 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 is gradually reduced along a first direction, wherein the first direction is parallel to the light emitting surface of the display device, and a side of the display device, which is close to the driving chip, is directed away from the driving chip.
12. A driving method of a display device for driving the display device according to claim 7, wherein 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 phase: the second control end in the first display area provides a first constant voltage signal, and the second control end 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 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 when the threshold compensation phase is finished.
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 phase: the second control end in the third display area provides a third constant voltage signal;
The voltage of the third constant voltage signal is smaller than that of the second constant voltage signal and larger than that of the first constant voltage signal, so that when the threshold compensation phase is finished, the control end potential of the driving module in the third display area is lower than that of the driving module in the second display area and higher than that of the driving module in the first display area.
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 according to claim 14, wherein a voltage V 1 of the first constant voltage signal satisfies-0.5 v+. 1 <0V, and a voltage V 2 of the second constant voltage signal satisfies 0V < V 2 +.0.5V.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
-
2020
- 2020-12-23 CN CN202011534523.6A patent/CN112669748B/en active Active
Patent Citations (5)
| 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 |
| 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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