CN111613178A - Pixel circuit, driving method thereof, display substrate and display device - Google Patents
Pixel circuit, driving method thereof, display substrate and display device Download PDFInfo
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- CN111613178A CN111613178A CN202010606126.9A CN202010606126A CN111613178A CN 111613178 A CN111613178 A CN 111613178A CN 202010606126 A CN202010606126 A CN 202010606126A CN 111613178 A CN111613178 A CN 111613178A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0257—Reduction of after-image effects
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Abstract
The present invention provides a pixel circuit, including: the data writing sub-circuit, the first driving transistor, the second driving transistor, the first capacitor and the second capacitor are connected to the first node; the data write sub-circuit is configured to: transmitting a data voltage signal on the data line to the first node in response to the control of the scan signal line; the first drive transistor is configured to: in the odd frames, providing a driving current for the light emitting device according to the voltage difference between the grid potential and the first voltage signal; the second drive transistor is configured to: and supplying a driving current to the light emitting device according to a voltage difference between the gate potential and the second voltage signal in the even frame. The invention also provides a driving method of the pixel circuit, a display substrate and a display device. The invention can effectively solve the problem of short-term afterimage.
Description
Technical Field
The invention relates to the technical field of display, in particular to a pixel circuit, a driving method thereof, a display substrate and a display device.
Background
In the current pixel circuit, the problem of image retention of the display device during displaying is caused by the hysteresis effect of the driving transistor, and in order to solve the problem, the reset transistor is provided in the pixel circuit so as to turn off the driving transistor in the reset stage of one frame, thereby improving the problem of image retention.
However, the reset phase is usually only 100 μ s, the off time of the driving transistor is short, and the improvement effect is poor.
Disclosure of Invention
The invention aims to solve at least one technical problem in the prior art, and provides a pixel circuit, a driving method thereof, a display substrate and a display device.
In order to achieve the above object, the present invention provides a pixel circuit, comprising: the data writing circuit comprises a data writing sub-circuit, a first driving transistor, a second driving transistor, a first capacitor and a second capacitor, wherein a grid electrode of the first driving transistor, a grid electrode of the second driving transistor, one end of the first capacitor, one end of the second capacitor and the data writing sub-circuit are connected to a first node, a first electrode of the first driving transistor is connected with the other end of the first capacitor and a first voltage end, and a first electrode of the second driving transistor is connected with the other end of the second capacitor and a second voltage end; the first voltage end loads a first voltage signal in an active level state in an odd frame and loads a second voltage signal in an inactive level state in an even frame, and the second voltage end loads the second voltage signal in the odd frame and loads the first voltage signal in the even frame;
the data write subcircuit is configured to: transmitting a data voltage signal on a data line to the first node in response to control of a scan signal line;
the first drive transistor is configured to: in odd frames, providing a driving current for the light emitting device according to a voltage difference between the grid potential of the light emitting device and the first voltage signal;
the second drive transistor is configured to: and providing a driving current for the light emitting device according to a voltage difference between the gate potential of the light emitting device and the second voltage signal in an even frame.
Optionally, the data writing sub-circuit comprises: the data writing circuit comprises a data writing transistor and a threshold compensation transistor, wherein the grid electrode of the data writing transistor is connected with the scanning signal line, the first pole of the data writing transistor is connected with the data line, the second pole of the data writing transistor is connected with the first pole of the threshold compensation transistor, and the grid electrode and the second pole of the threshold compensation transistor are both connected with the first node.
Optionally, the pixel circuit further comprises a first reset sub-circuit configured to: resetting the potential of the first node in response to control of a reset control line.
Optionally, the first reset sub-circuit comprises: and a first pole of the first reset transistor is connected with a reference voltage end, a second pole of the first reset transistor is connected with the first node, and a grid electrode of the first reset transistor is connected with the reset control line.
Optionally, the pixel circuit further comprises: a light emission control sub-circuit configured to: and conducting the second poles of the first and second driving transistors to the light emitting device in response to control of the light emission control line.
Optionally, the light emission control sub-circuit comprises: and a first pole of the light emission control transistor is connected with the second pole of the first driving transistor and the second pole of the second driving transistor, the second pole of the light emission control transistor is connected with the first pole of the light emitting device, and a grid electrode of the light emission control transistor is connected with the light emission control line.
Optionally, the pixel circuit further comprises a second reset sub-circuit configured to: the potential of the first pole of the light emitting device is reset in response to control of a reset control line.
Optionally, the second reset sub-circuit comprises: and the first stage of the second reset transistor is connected with the reference voltage end, the second pole of the second reset transistor is connected with the first pole of the light-emitting device, and the grid of the second reset transistor is connected with the reset control line.
The invention also provides a display substrate, which comprises the pixel circuit.
The invention also provides a display device, which comprises the display substrate.
The invention further provides a driving method of the pixel circuit, wherein the pixel circuit is the pixel circuit, and the driving method comprises the following steps:
providing effective level signals to the scanning signal lines in both the data writing stage of the odd frame and the data writing stage of the even frame;
in an odd frame, the first voltage signal is further provided to the first voltage end, so that the first driving transistor provides a driving current for the light emitting device in a data writing stage of the odd frame; and in the even frame, the first voltage signal is also provided to the second voltage end, so that the second driving transistor provides driving current for the light-emitting device in the data writing stage of the even frame.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and 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 and not to limit the invention. In the drawings:
FIG. 1a is a diagram illustrating a display screen provided in the related art;
FIG. 1b is a diagram illustrating a short-term afterimage of an image provided in the related art;
FIG. 1c is a schematic diagram of a related art method for generating short-term afterimages;
FIG. 1d is a diagram of a pixel circuit provided in the related art;
fig. 1e is a timing diagram of a pixel circuit provided in the related art;
fig. 2 is a schematic structural diagram of a pixel circuit according to an embodiment of the invention;
fig. 3a is a second schematic structural diagram of a pixel circuit according to an embodiment of the invention;
fig. 3b is a third schematic structural diagram of a pixel circuit according to an embodiment of the invention;
FIG. 4 is a timing diagram of a pixel circuit according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
Unless otherwise defined, technical or scientific terms used in the embodiments of the present invention should have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. The use of "first," "second," and similar terms in the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. Likewise, the word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
Fig. 1a is a schematic diagram of a display screen provided in the related art, fig. 1b is a schematic diagram of an image provided in the related art with a short-term afterimage, fig. 1c is a schematic diagram of a short-term afterimage generated in the related art, and fig. 1a to 1c are combined, where a dotted line in fig. 1c is a characteristic curve of current and voltage of a driving Transistor (DTFT) in a pixel displaying a black screen in an OLED display device, and a solid line is a characteristic curve of current and voltage of a driving Transistor in a pixel displaying a white screen. As can be seen from fig. 1c, when a pixel displaying a white frame is switched to display a gray-scale frame, the luminance of the pixel displaying the white frame needs to be reduced, and the current of the driving transistor in the pixel needs to be reduced, so that the driving transistor in the pixel needs to perform charge discharging (Hole discharging) from a point a1 to a point a2, where the value of the gate-source voltage Vgs of the driving transistor is changed from Vwhite to Vgray; when a pixel displaying a black picture is switched to display a gray-scale picture, the luminance of the pixel displaying the black picture needs to be increased, and the current of the driving transistor in the pixel needs to be increased, so that the driving transistor in the pixel needs to perform charge Trapping (Hole Trapping) from a point A3 to a point a4, and the value of the gate-source voltage Vgs of the driving transistor is changed from Vblack to Vgray. As can be seen from fig. 1c, since the paths of the voltage changes during the charge trapping and discharging processes are different, the currents respectively corresponding to the points a2 and a4 reaching the voltage Vgray along different paths are different, so that the luminance difference exists between the pixel converted from the white picture to the gray-scale picture and the pixel converted from the black picture to the gray-scale picture, and the short-term afterimage phenomenon shown in fig. 1b occurs. Analysis shows that the short-term afterimage phenomenon is related to the hysteresis effect of the driving transistor.
Therefore, in the related art, the driving transistors are kept off by the reset transistors in the reset phase to discharge charges, so that when the next image frame is displayed, the brightness of each pixel needs to be increased, that is, the current of the driving transistors in each pixel needs to be increased, and therefore, the driving transistors need to capture charges, so that the charge capture paths of the driving transistors are the same from a point A3 to a point a4, thereby improving the problem of short-term afterimage to some extent.
Specifically, fig. 1d is a diagram of a pixel circuit provided in the related art, and fig. 1e is a timing diagram of a pixel circuit provided in the related art, which includes a data voltage writing transistor M11, a driving transistor M12, a reset transistor M13, and a storage capacitor C11, as shown in fig. 1d and fig. 1 e. A first pole of the Data voltage writing transistor M11 is connected to the Data line Data, a second pole of the Data voltage writing transistor M11 is connected to one end of the storage capacitor C11 and the gate of the driving transistor M12, the gate of the Data voltage writing transistor M11 is connected to the scan signal line Select, a first pole of the driving transistor M12 is connected to the first voltage terminal Vdd and the other end of the storage capacitor C11, a second pole of the driving transistor M12 is connected to the light emitting device OLED, a first pole and a gate of the reset transistor M13 are connected to the clock signal line CLK, and a second pole of the reset transistor M13 is connected to the gate of the driving transistor M12. As shown in fig. 1e, the operation phase of the pixel circuit comprises: a data write phase t1 and a reset phase t 2. In the Data writing phase t1, a scan signal is supplied to the scan signal line Select, the Data voltage writing transistor M11 is turned on, a Data voltage signal of the Data line Data is written into the storage capacitor C11, and the driving transistor M12 supplies a driving current to the light emitting device OLED according to a voltage difference between the gate and the first electrode thereof. At the reset period t2, when the reset signal is supplied to the clock signal line CLK, the reset transistor M13 is turned on, so that the reset signal supplied from the clock signal line CLK is transmitted to the gate of the driving transistor M12, and at this time, the voltage of the reset signal supplied from the clock signal line CLK may be made higher than the voltage of the first voltage terminal Vdd, so that the driving transistor M12 is turned off.
However, in order to ensure that the light emitting time of the light emitting device OLED in one frame is as long as possible, the reset period t2 is usually only about 100 μ s, the off time of the driving transistor M12 is short, and the degree of charge release of the driving transistor M12 is limited, so that it is difficult to effectively solve the problem of short-term afterimage.
In view of the above, the present invention provides a pixel circuit, and fig. 2 is a schematic structural diagram of a pixel circuit according to an embodiment of the present invention, as shown in fig. 2, the pixel circuit includes: the data writing sub-circuit 1, the first driving transistor MD1, the second driving transistor MD2, the first capacitor C1, and the second capacitor C2, the gate of the first driving transistor MD1, the gate of the second driving transistor MD2, one end of the first capacitor C1, one end of the second capacitor C2, and the data writing sub-circuit 1 are connected to a first node N1, the first pole of the first driving transistor MD1 is connected to the other end of the first capacitor C1 and the first voltage terminal Vdd _ odd, and the first pole of the second driving transistor MD2 is connected to the other end of the second capacitor C2 and the second voltage terminal Vdd _ even. The first voltage terminal Vdd _ odd loads a first voltage signal in an active level state in an odd frame and loads a second voltage signal in an inactive level state in an even frame, and the second voltage terminal Vdd _ even loads a second voltage signal in the odd frame and loads the first voltage signal in the even frame.
The data writing sub-circuit 1 is configured to: the Data voltage signal on the Data line Data is transmitted to the first node N1 in response to the control of the Scan signal line Scan.
The first drive transistor MD1 is configured to: in the odd frame, the driving current is supplied to the light emitting device 2 according to the voltage difference between the gate potential thereof and the first voltage signal.
The second drive transistor MD2 is configured to: in the even frame, the driving current is supplied to the light emitting device 2 according to the voltage difference between the gate potential thereof and the second voltage signal.
In the embodiment of the present invention, in the odd frame, the first voltage signal is supplied to the first voltage terminal Vdd _ odd, the second voltage signal is supplied to the second voltage terminal Vdd _ even, and when the Scan signal is supplied to the Scan signal line Scan and the Data voltage signal is supplied to the Data line Data, the first driving transistor MD1 is turned on and supplies the driving current to the light emitting device 2 according to the Data voltage signal and the first voltage signal; the second drive transistor MD2 is turned off. In an even frame, the second voltage signal is supplied to the first voltage terminal Vdd _ odd, the first voltage signal is supplied to the second voltage terminal Vdd _ even, and when the Scan signal is supplied to the Scan signal line Scan and the Data voltage signal is supplied to the Data line Data, the second driving transistor MD2 is turned on and supplies the driving current to the light emitting device 2 according to the Data voltage signal and the second voltage signal; the first driving transistor MD1 is turned off.
In summary, in the pixel circuit according to the embodiment of the invention, the first driving transistor MD1 and the second driving transistor MD2 both have an off time of one frame, which is long enough to enable the first driving transistor MD1 and the second driving transistor MD2 to perform sufficient charge release, so as to effectively solve the problem of short-term image retention.
It should be noted that the transistor used in the embodiment of the present invention may be a thin film transistor or a field effect transistor or other data writing devices with the same characteristics, and the thin film transistor may include an oxide semiconductor thin film transistor, an amorphous silicon thin film transistor, a polysilicon thin film transistor, or the like. The source and drain of the transistor may be symmetrical in structure, so that the source and drain may be physically indistinguishable. In the embodiment of the present invention, in order to distinguish transistors, in addition to the gate serving as the control electrode, one of the electrodes is directly described as a first electrode, and the other electrode is directly described as a second electrode, so that the first electrode and the second electrode of all or part of the transistors in the embodiment of the present invention can be interchanged as needed.
The Light Emitting device 2 in the embodiment of the present invention may be a current-driven Light Emitting device 2 such as an LED (Light Emitting Diode) or an OLED (Organic Light Emitting Diode), and in the embodiment of the present invention, the OLED is taken as an example for explanation.
Fig. 3a is a second schematic structural diagram of a pixel circuit according to an embodiment of the present invention, and as shown in fig. 3a, the pixel circuit further includes: a first reset sub-circuit 3, the first reset sub-circuit 3 being configured to: the potential of the first node N1 is reset in response to control of the reset control line Rst.
In some embodiments, the pixel circuit further comprises: a light emission control sub-circuit 4, the light emission control sub-circuit 4 being configured to: the second pole of the first driving transistor MD1 and the second pole of the second driving transistor MD2 are turned on with the light emitting device 2 in response to the control of the emission control line EM.
In some specific embodiments, the pixel circuit further comprises a second reset sub-circuit 5, the second reset sub-circuit 5 being configured to: the potential of the first pole of the light emitting device 2 is reset in response to the control of the reset control line Rst.
As shown in fig. 3a, the transistors of the pixel circuit provided in the embodiment of the present invention may be P-type transistors, and the data writing sub-circuit 1 includes: a Data writing transistor M1 and a threshold compensating transistor M2, the gate of the Data writing transistor M1 is connected to the Scan signal line Scan, the first pole of the Data writing transistor M1 is connected to the Data line Data, the second pole of the Data writing transistor M1 is connected to the first pole of the threshold compensating transistor M2, and the gate and the second pole of the threshold compensating transistor M2 are both connected to the first node N1.
In some embodiments, the first reset sub-circuit 3 includes: a first reset transistor M3, a first pole of the first reset transistor M3 is connected to the reference voltage terminal Vref, a second pole of the first reset transistor M3 is connected to the first node N1, and a gate of the first reset transistor M3 is connected to the reset control line Rst.
In some embodiments, the light emission control sub-circuit 4 includes: the light emission control transistor M4, a first pole of the light emission control transistor M4 is connected to the second pole of the first driving transistor MD1 and the second pole of the second driving transistor MD2, a second pole of the light emission control transistor M4 is connected to the first pole of the light emitting device 2, for example, the first pole of the light emitting device 2 is an anode, the second pole is a cathode, the cathode of the light emitting device 2 is connected to a low level voltage terminal Vss, and the gate of the light emission control transistor M4 is connected to the light emission control line EM.
In some embodiments, the second reset sub-circuit 5 includes: a second reset transistor M5, a first stage of the second reset transistor M5 is connected to the reference voltage terminal Vref, a second pole of the second reset transistor M5 is connected to the first pole of the light emitting device 2, and a gate of the second reset transistor M5 is connected to the reset control line Rst.
Fig. 4 is a timing diagram of a pixel circuit according to an embodiment of the present invention, and the following explains an operation process of the pixel circuit according to the embodiment of the present invention with reference to fig. 3a and fig. 4, specifically:
in the odd frame, the first voltage signal is supplied to the first voltage terminal Vdd _ odd, the second voltage signal is supplied to the second voltage terminal Vdd _ even, and the reset signal is supplied to the reset control line Rst during the reset period T1, at which the first and second reset transistors M3 and M5 are turned on to reset the first node N1 and the first pole of the light emitting device 2. In the Data writing phase T2, a Scan signal is supplied to the Scan signal line Scan, and a Data voltage signal is supplied to the Data line Data, at which time, the Data writing transistor M1 and the threshold compensation transistor M2 are turned on, and the Data signal Vdata and the threshold voltage Vth1 of the threshold compensation transistor M2 are written into the first capacitor C1 and the second capacitor C2. The gate voltage Vg of the first driving transistor MD1 transistor is Vdata + Vth1, the source (first pole) voltage Vs1 of the first driving transistor MD1 transistor is Vdd _ odd, the gate voltage Vg of the second driving transistor MD2 transistor is Vdata + Vth1, and the source (first pole) voltage Vs2 of the second driving transistor MD2 transistor is Vdd _ even, since the first driving transistor MD1 and the first driving transistor MD1 are both P-type transistors, Vgs1-VthD1<0 and Vgs2-VthD1>0 are enabled, so that the first driving transistor MD1 is turned on and the second driving transistor MD2 is turned off. Where Vgs1 is the gate-source voltage of the first driving transistor MD1, VthD1 is the threshold voltage of the first driving transistor MD1, Vgs2 is the gate-source voltage of the second driving transistor MD1, VthD2 is the threshold voltage of the second driving transistor MD1, the gate-source voltage Vgs of the first driving transistor MD1 is Vdata + Vth1-Vdd _ odd, and Vth1 is approximately equal to VthD1, so that the driving current I of the first driving transistor MD1 is 0.5k (Vgs-VthD1) ^2 0.5k (Vdata-Vdd) ^2, thereby compensating the threshold voltage of the first driving transistor MD1, and making the driving current I of the first driving transistor MD1 independent of the threshold voltage VthD1 of the first driving transistor MD 1. Wherein k is a constant.
In the even frame, the second voltage signal is supplied to the first voltage terminal Vdd _ odd, and the first voltage signal is supplied to the second voltage terminal Vdd _ even, at which time, in the data writing period T2, the second driving transistor MD2 is turned on, and the first driving transistor MD1 is turned off. Similarly to the odd frames, the driving current supplied to the light emitting device 2 at the even frames is independent of the threshold voltage of the second driving transistor MD 2.
Fig. 3b is a third schematic structural diagram of a pixel circuit according to an embodiment of the present invention, as shown in fig. 3b, in other specific embodiments, the transistors in the pixel circuit may also be N-type transistors, and at this time, the structure of the pixel circuit is as shown in fig. 3b, a first pole of the first driving transistor MD1 is connected to the third voltage terminal Vss _ odd, a first pole of the second driving transistor MD2 is connected to the fourth voltage terminal Vss _ even, a second pole of the light emission control transistor M4 is connected to the cathode of the light emitting device 2, and the anode of the light emitting device 2 is connected to a high level voltage terminal Vdd.
The embodiment of the invention also provides a display substrate, which comprises the pixel circuit.
The display substrate of the embodiment of the invention adopts the pixel circuits, so that the drive transistor in each pixel circuit has the cut-off time of one frame, and the problem of short-term afterimage is effectively solved.
The embodiment of the invention also provides a display device, which comprises the display substrate.
The display device may be: any product or component with a display function, such as electronic paper, a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like.
Fig. 5 is a schematic structural diagram of a display device according to an embodiment of the present invention, and as shown in fig. 5, the display device includes: the display device comprises a pixel circuit 10, a gate drive circuit 6, a drive module 7 and a control module 8, wherein the display device is provided with a display area, the pixel circuit 10 is arranged in the display area, and the gate drive circuit 6 is arranged on at least one side of the display area. In the embodiment of the present invention, the emission control line EM, the Scan signal line Scan, and the reset control line Rst may be connected to the gate driving circuit 6, the Data line Data may be connected to the driving block 7, and the first voltage terminal Vdd _ odd and the second voltage terminal Vdd _ even may be connected to the control block 8.
Alternatively, the display region includes a plurality of rows and a plurality of columns of pixels, each of the pixels has a pixel circuit 10 disposed therein, and the pixel circuits 10 in the same row are connected to the same Scan signal line Scan and the same reset control line Rst. In the pixel circuits 10 in two adjacent rows, the reset control line Rst connected to the pixel circuit 10 in the next row is the same as the scanning signal line Scan connected to the pixel circuit 10 in the previous row.
The present invention further provides a driving method of a pixel circuit, wherein the pixel circuit is the above pixel circuit, and the driving method includes:
in both the data writing stage of the odd frame and the data writing stage of the even frame, an active level signal is supplied to the scanning signal line.
And in the odd frame, a first voltage signal is also provided to the first voltage end, so that the first driving transistor provides driving current for the light-emitting device in the data writing stage of the odd frame. In the even frame, the first voltage signal is also provided to the second voltage end, so that the second driving transistor provides the driving current for the light-emitting device in the data writing stage of the even frame.
By adopting the driving method of the embodiment of the invention, the driving transistor in the pixel circuit can have the cut-off time of one frame, thereby effectively solving the problem of short-term afterimage.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (11)
1. A pixel circuit, comprising: the data writing circuit comprises a data writing sub-circuit, a first driving transistor, a second driving transistor, a first capacitor and a second capacitor, wherein a grid electrode of the first driving transistor, a grid electrode of the second driving transistor, one end of the first capacitor, one end of the second capacitor and the data writing sub-circuit are connected to a first node, a first electrode of the first driving transistor is connected with the other end of the first capacitor and a first voltage end, and a first electrode of the second driving transistor is connected with the other end of the second capacitor and a second voltage end; the first voltage end loads a first voltage signal in an active level state in an odd frame and loads a second voltage signal in an inactive level state in an even frame, and the second voltage end loads the second voltage signal in the odd frame and loads the first voltage signal in the even frame;
the data write subcircuit is configured to: transmitting a data voltage signal on a data line to the first node in response to control of a scan signal line;
the first drive transistor is configured to: in odd frames, providing a driving current for the light emitting device according to a voltage difference between the grid potential of the light emitting device and the first voltage signal;
the second drive transistor is configured to: and providing a driving current for the light emitting device according to a voltage difference between the gate potential of the light emitting device and the second voltage signal in an even frame.
2. The pixel circuit according to claim 1, wherein the data writing sub-circuit comprises: the data writing circuit comprises a data writing transistor and a threshold compensation transistor, wherein the grid electrode of the data writing transistor is connected with the scanning signal line, the first pole of the data writing transistor is connected with the data line, the second pole of the data writing transistor is connected with the first pole of the threshold compensation transistor, and the grid electrode and the second pole of the threshold compensation transistor are both connected with the first node.
3. The pixel circuit of claim 1, further comprising a first reset sub-circuit configured to: resetting the potential of the first node in response to control of a reset control line.
4. The pixel circuit of claim 3, wherein the first reset sub-circuit comprises: and a first pole of the first reset transistor is connected with a reference voltage end, a second pole of the first reset transistor is connected with the first node, and a grid electrode of the first reset transistor is connected with the reset control line.
5. The pixel circuit according to claim 1, further comprising: a light emission control sub-circuit configured to: and conducting the second poles of the first and second driving transistors to the light emitting device in response to control of the light emission control line.
6. The pixel circuit of claim 5, wherein the light emission control sub-circuit comprises: and a first pole of the light emission control transistor is connected with the second pole of the first driving transistor and the second pole of the second driving transistor, the second pole of the light emission control transistor is connected with the first pole of the light emitting device, and a grid electrode of the light emission control transistor is connected with the light emission control line.
7. The pixel circuit of claim 6, further comprising a second reset sub-circuit configured to: the potential of the first pole of the light emitting device is reset in response to control of a reset control line.
8. The pixel circuit of claim 7, wherein the second reset sub-circuit comprises: and the first stage of the second reset transistor is connected with the reference voltage end, the second pole of the second reset transistor is connected with the first pole of the light-emitting device, and the grid of the second reset transistor is connected with the reset control line.
9. A display substrate comprising the pixel circuit according to any one of claims 1 to 8.
10. A display device comprising the display substrate according to claim 9.
11. A driving method of a pixel circuit according to any one of claims 1 to 8, the driving method comprising:
providing effective level signals to the scanning signal lines in both the data writing stage of the odd frame and the data writing stage of the even frame;
in an odd frame, the first voltage signal is further provided to the first voltage end, so that the first driving transistor provides a driving current for the light emitting device in a data writing stage of the odd frame; and in the even frame, the first voltage signal is also provided to the second voltage end, so that the second driving transistor provides driving current for the light-emitting device in the data writing stage of the even frame.
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| CN202010606126.9A CN111613178A (en) | 2020-06-29 | 2020-06-29 | Pixel circuit, driving method thereof, display substrate and display device |
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| CN202010606126.9A CN111613178A (en) | 2020-06-29 | 2020-06-29 | Pixel circuit, driving method thereof, display substrate and display device |
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