CN110047436B - Pixel circuit, array substrate, driving method of array substrate, display panel and display device - Google Patents
Pixel circuit, array substrate, driving method of array substrate, display panel and display device Download PDFInfo
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- CN110047436B CN110047436B CN201910491973.2A CN201910491973A CN110047436B CN 110047436 B CN110047436 B CN 110047436B CN 201910491973 A CN201910491973 A CN 201910491973A CN 110047436 B CN110047436 B CN 110047436B
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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]
- G09G3/3225—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] using an active matrix
- G09G3/3233—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] using an active matrix with pixel circuitry controlling the current through the light-emitting element
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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]
- G09G3/3275—Details of drivers for data electrodes
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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
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
Abstract
The embodiment of the invention provides a pixel circuit, an array substrate, a driving method thereof, a display panel and a display device, wherein the pixel circuit comprises: a driving transistor, an electroluminescent device, and a first light emission controlling transistor connected between the driving transistor and the electroluminescent device; the first light emitting control transistor is configured to control a loading time period of the driving current according to a load amount of a data line providing the data signal, the larger the load amount of the data line, the longer the time period of the driving current loading. In the process of driving the pixel circuit, under the same driving voltage, the larger the load of the data line, the smaller the current loaded by the data line, which may cause the lower brightness of the electroluminescent device connected to the data line with large load at the same driving time.
Description
Technical Field
The invention relates to the technical field of display, in particular to a pixel circuit, an array substrate, a driving method of the pixel circuit, a display panel and a display device.
Background
The display panel comprises a plurality of sub-pixel areas defined by gate lines and data lines in a crossed mode, each sub-pixel area comprises an electroluminescent device with a corresponding color, the electroluminescent devices are current-driven type luminescent devices, the magnitude of loaded current of the electroluminescent devices can directly influence the electroluminescent devices, different loading amounts of the data lines can exist in the process of designing the display panel, the different loading amounts of the data lines can cause the brightness of the electroluminescent devices connected with the data lines to be different, the display brightness of the sub-pixels in different columns is different, and the display quality is influenced.
Therefore, how to compensate for the display brightness unevenness of the sub-pixels in different columns due to the different loading amounts of the data lines is an urgent technical problem to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, embodiments of the present invention provide a pixel circuit, an array substrate, a driving method thereof, a display panel and a display device, so as to solve the problem in the related art that display brightness of sub-pixels in different rows is not uniform due to different loading amounts of data lines.
In a first aspect, an embodiment of the present invention provides a pixel circuit, including: the electroluminescent device comprises a driving transistor, an electroluminescent device and a first light-emitting control transistor connected between the driving transistor and the electroluminescent device;
the driving transistor is configured to provide a driving current to the electroluminescent device according to a received data signal;
the first light emitting control transistor is configured to control a loading time period of the driving current according to a load amount of a data line providing the data signal, and the larger the load amount of the data line is, the longer the driving current is loaded.
In one possible implementation manner, in the pixel circuit provided by the embodiment of the present invention, a gate of the first light-emitting control transistor is electrically connected to a first light-emitting control signal line, a first pole of the first light-emitting control transistor is electrically connected to a second pole of the driving transistor, and the second pole of the first light-emitting control transistor is electrically connected to an anode of the electroluminescent device;
wherein the first light emitting control signal line is configured to load a first light emitting control signal, and the duty ratio of the first light emitting control signal is larger the load amount of the data line is.
In a possible implementation manner, in the pixel circuit provided in an embodiment of the present invention, the pixel circuit further includes: a second light emission control transistor;
a gate of the second light emission control transistor is electrically connected to a second light emission control signal line, a first electrode of the second light emission control transistor is electrically connected to a first voltage signal terminal, and a second electrode of the second light emission control transistor is electrically connected to the first electrode of the driving transistor;
the second light-emitting control signal line is configured to be loaded with a second light-emitting control signal, and the duty ratio of the second light-emitting control signal is greater than or equal to the maximum duty ratio of the first light-emitting control signal received by each pixel circuit connected to the second light-emitting control signal line.
In a possible implementation manner, in the pixel circuit provided in an embodiment of the present invention, the pixel circuit further includes: a third light emission control transistor;
the grid electrode of the third light-emitting control transistor is electrically connected with the second light-emitting control signal line, the first pole of the third light-emitting control transistor is electrically connected with the second pole of the first light-emitting control transistor, and the second pole of the third light-emitting control transistor is electrically connected with the anode of the electroluminescent device.
In a possible implementation manner, in the pixel circuit provided in an embodiment of the present invention, the pixel circuit further includes: a data writing transistor, a potential control transistor, a first reset transistor, a second reset transistor and a capacitor;
a gate of the data writing transistor is electrically connected to a scanning signal line, a first pole of the data writing transistor is electrically connected to the data line, and a second pole of the data writing transistor is electrically connected to the first pole of the driving transistor;
the grid electrode of the potential control transistor is electrically connected with the scanning signal line, the first pole of the potential control transistor is electrically connected with the grid electrode of the driving transistor, and the second pole of the potential control transistor is electrically connected with the second pole of the driving transistor;
the grid electrode of the first reset transistor is electrically connected with the reset control end, the first electrode of the first reset transistor is electrically connected with the initial signal end, and the second electrode of the first reset transistor is electrically connected with the grid electrode of the driving transistor;
the grid electrode of the second reset transistor is electrically connected with the reset control end, the first electrode of the second reset transistor is electrically connected with the initial signal end, and the second electrode of the second reset transistor is electrically connected with the anode of the electroluminescent device;
the first electrode of the capacitor is electrically connected with the grid electrode of the driving transistor, and the second electrode of the capacitor is electrically connected with the first voltage signal end.
In a second aspect, an embodiment of the present invention further provides an array substrate, including: a plurality of pixel circuits according to the embodiment of the first aspect arranged in an array;
the same data line is electrically connected with a row of pixel circuits;
a plurality of first light emission control signal lines, the same one of which is electrically connected to one of the rows of the pixel circuits;
the duty ratio of the first light-emitting control signal loaded by the first light-emitting control signal line is larger as the load amount of the data line electrically connected with the pixel circuit in the same column is larger.
In one possible implementation manner, an array substrate provided in an embodiment of the present invention includes:
a plurality of gate lines, the same gate line being electrically connected to one row of the pixel circuits;
a plurality of second light emission control signal lines, the same one of which is electrically connected to one of the rows of the pixel circuits;
the duty ratio of a second light-emitting control signal provided by the second light-emitting control signal line is greater than or equal to the maximum duty ratio of the first light-emitting control signal received by each pixel circuit connected with the second light-emitting control signal line.
In one possible implementation manner, an array substrate provided in an embodiment of the present invention includes: the display device comprises a display area, a binding area and a wiring area positioned between the display area and the binding area;
the display region includes a plurality of pixel regions defined by intersections of the data lines and the gate lines, and the pixel circuits corresponding to the respective pixel regions;
the routing area comprises fan-out routing lines which correspond to the data lines one by one, at least the first fan-out routing line and the second fan-out routing line have different resistances, and the resistance of the first fan-out routing line is greater than that of the second fan-out routing line;
the binding region comprises binding components, and the binding components are configured to provide driving signals provided by a driving chip to the corresponding fan-out routing lines respectively;
the duty ratio of the first light emitting control signal received by the pixel circuit corresponding to the first fan-out wiring is larger than the duty ratio of the first light emitting control signal received by the pixel circuit corresponding to the second fan-out wiring.
In a possible implementation manner, in the array substrate provided in this embodiment of the present invention, the larger the resistance of the fan-out trace is, the larger the duty ratio of the first lighting control signal received by the pixel circuit corresponding to the fan-out trace is.
In one possible implementation manner, in the array substrate provided in an embodiment of the present invention, the display area includes: the display device comprises a first sub-display area and a second sub-display area, wherein the first sub-display area and the second sub-display area are axially symmetrical along the extending direction of a data line;
in each sub-display area, along the extending direction of the grid line and the direction of the symmetrical axis, the resistance of the fan-out routing line connected with each data line is reduced in sequence.
In a third aspect, an embodiment of the present invention further provides a driving method for an array substrate, including:
providing first light-emitting control signals with different duty ratios to the pixel circuits according to the load of a data line for providing the data signals;
wherein, the larger the load amount of the data line, the longer the time of the driving current loading.
In one possible implementation manner, in the driving method of an array substrate provided in an embodiment of the present invention, the method further includes:
providing a second light-emitting control signal to each pixel circuit according to the duty ratio of the first light-emitting control signal line received by the pixel circuit connected with the same second light-emitting control signal line;
the duration of the second light-emitting control signal is greater than or equal to the maximum duration of the first light-emitting control signal received by each pixel circuit connected with the second light-emitting control signal line.
In a fourth aspect, an embodiment of the present invention further provides a display panel, including the array substrate according to the embodiment of the second aspect.
In a fifth aspect, embodiments of the present invention further provide a display device, including the display panel according to the second aspect.
The embodiment of the invention has the following beneficial effects:
the embodiment of the invention provides a pixel circuit, an array substrate, a driving method thereof, a display panel and a display device, wherein the pixel circuit comprises: the electroluminescent device comprises a driving transistor, an electroluminescent device and a first light-emitting control transistor connected between the driving transistor and the electroluminescent device; the driving transistor is configured to provide a driving current to the electroluminescent device according to a received data signal; the first light emitting control transistor is configured to control a loading time period of the driving current according to a load amount of a data line providing the data signal, and the larger the load amount of the data line is, the longer the driving current is loaded. In the process of driving the pixel circuit, under the same driving voltage, the larger the load of the data line, the smaller the current loaded by the data line, which may cause the lower brightness of the electroluminescent device connected to the data line with large load at the same driving time.
Drawings
Fig. 1 is a schematic structural view of an array substrate in the related art;
fig. 2 is a second schematic structural view of an array substrate in the related art;
fig. 3 is a third schematic structural view of an array substrate in the related art;
fig. 4 is a schematic structural diagram of a pixel circuit according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of an array substrate according to an embodiment of the present invention;
fig. 6 is a timing diagram illustrating driving of the array substrate according to an embodiment of the invention;
fig. 7 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Detailed Description
In the related art, due to different designs of the display panel, the load amount of the Data lines may vary, as shown in fig. 1, the array substrate includes pixel circuits 1 arranged in an array, the array substrate further includes a display area a and an opening area B, due to the existence of the opening area B, the length of the Data line Data1 at the position corresponding to the opening area B is smaller than the length of the Data line Data at the position where the opening area B is not provided, and due to the different lengths of the Data lines (Data 1 and Data), the load amount of each Data line (Data 1 and Data) varies, and under the same driving voltage, the magnitude of the current applied to the electroluminescent devices in the pixel circuits connected with the different Data lines (1 and Data) may vary.
In addition to fig. 1, the array substrate may also be the structure shown in fig. 2, in which the display area a includes the pixel circuits 1 arranged in an array, and no opening area is provided in the display area 1, so that there is no difference in the length of each Data line Data, but each Data line Data is electrically connected to the bonding terminal PAD through the fan-out trace 2 provided in the trace area C, to realize the transmission of the driving signal, as shown in fig. 2, the distances between the Data lines Data and the binding terminals PAD located at different areas are different, this results in different lengths of the fan-out traces 2 to which different Data lines Data are connected, and thus in different amounts of Data lines Data (the amounts of Data lines Data include the resistance of the Data lines Data themselves and the resistance of the connected fan-out traces 2), so that the magnitude of the current applied to the electroluminescent devices in the pixel circuits 1 connected by the different Data lines Data may not be uniform.
As shown in fig. 3, in the array substrate in the related art, the fan-out traces 2 with smaller resistance are arranged in a roundabout trace manner to increase the resistance of the corresponding fan-out traces 2, so that the resistance of each fan-out trace 2 tends to be consistent, but the arrangement greatly increases the width of the frame, which is not beneficial to realizing narrow frame design.
The above description is only for describing that different structural designs of the display panel lead to different loads of the data lines, but the invention is not limited thereto, and other structures of the array substrate that can lead to different loads of the data lines are also within the scope of the invention, and are not limited thereto.
In view of the foregoing problems in the related art, embodiments of the present invention provide a pixel circuit, an array substrate, a driving method thereof, a display panel, and a display device. In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The shapes and sizes of the various elements in the drawings are not to scale and are merely intended to illustrate the invention.
An embodiment of the present invention provides a pixel circuit, as shown in fig. 4, including: a driving transistor DT, an electroluminescent device OLED, and a first light emission controlling transistor T1 connected between the driving transistor DT and the electroluminescent device OLED;
the driving transistor DT is configured to supply a driving current to the electroluminescent device OLED according to the received data signal;
the first light emitting control transistor T1 is configured to control a loading time period of the driving current according to a load amount of the Data line Data supplying the Data signal, the greater the load amount of the Data line Data, the longer the time period of the driving current loading.
Specifically, in the pixel circuit provided by the embodiment of the present invention, since the light emission luminance of the electroluminescent device is related to the magnitude of the current loaded by the electroluminescent device and the duration of the loaded current, when the magnitude of the loaded current is the same, the longer the time of the loaded current is, the larger the luminance is, that is, when the current loaded by the electroluminescent device in one column of the pixel circuit is smaller than that of the electroluminescent devices in other columns of the pixel circuit, the duration of the current loaded by the electroluminescent device in the column of the pixel circuit can be increased, so that the light emission luminance of the column of the sub-pixels is consistent with the light emission luminance of the sub-pixels in other columns, and the uniformity of the display is improved.
In the process of driving the pixel circuit, under the same driving voltage, the larger the load of the data line, the smaller the current loaded by the data line, which may cause the lower brightness of the electroluminescent device connected to the data line with large load at the same driving time.
The loading duration of the driving current is controlled by adding the first light-emitting control transistor in the pixel circuit and controlling the opening duration of the first light-emitting control transistor.
Alternatively, in the pixel circuit provided in the embodiment of the invention, as shown in fig. 4, the gate of the first emission control transistor T1 is electrically connected to the first emission control signal line EM1, the first pole of the first emission control transistor T1 is electrically connected to the second pole of the driving transistor DT, and the second pole of the first emission control transistor T1 is electrically connected to the anode of the electroluminescent device OLED;
wherein the first lighting control signal line EM1 is configured to load the first lighting control signal, and the larger the load amount of the Data line Data, the larger the duty ratio of the first lighting control signal.
Specifically, in the pixel circuit provided in the embodiment of the present invention, the driving transistor supplies the driving current to the first electrode of the first light emitting control transistor, and the driving current can be supplied to the electroluminescent device only when the first light emitting control transistor is turned on, so that by designing the duty ratio of the signal supplied by the first light emitting control signal line, the on-time of the first light emitting control transistor, that is, the time period for supplying the driving current to the electroluminescent device can be controlled, and when the load amount of the data line is greater than that of the other data lines, the duty ratio of the first light emitting control signal corresponding to the data line can be increased, thereby compensating for the brightness difference caused by the load amount of the data line.
Optionally, in the pixel circuit provided in the embodiment of the present invention, as shown in fig. 4, the pixel circuit further includes: a second light emission controlling transistor T2;
a gate electrode of the second light emission controlling transistor T2 is electrically connected to the second light emission controlling signal line EM2, a first electrode of the second light emission controlling transistor T2 is electrically connected to the first voltage signal terminal ELVDD, and a second electrode of the second light emission controlling transistor T2 is electrically connected to the first electrode of the driving transistor DT;
the second emission control signal line EM2 is configured to be loaded with the second emission control signal, and the duty ratio of the second emission control signal is greater than or equal to the maximum duty ratio of the first emission control signal received by each pixel circuit to which the second emission control signal line is connected.
Specifically, in the pixel circuit provided by the embodiment of the invention, the second light-emitting control transistor is turned on in the light-emitting stage, the voltage of the first voltage signal terminal is provided to the first electrode of the driving transistor, and the driving current is formed through the driving transistor. The duty ratio of the second light emission control signal is set to be greater than or equal to the maximum duty ratio of the first light emission control signal received by each pixel circuit to which the second light emission control signal line is connected, in order to ensure that a drive current is present as long as the first light emission control transistor is turned on, so that the drive current can be supplied to the electroluminescent device through the turned-on first light emission control transistor.
Optionally, in the pixel circuit provided in the embodiment of the present invention, as shown in fig. 4, the pixel circuit further includes: a third light emission controlling transistor T3;
a gate of the third light emission controlling transistor T3 is electrically connected to the second light emission controlling signal line EM2, a first pole of the third light emission controlling transistor T3 is electrically connected to the second pole of the first light emission controlling transistor T1, and a second pole of the third light emission controlling transistor T3 is electrically connected to the anode of the electroluminescent device OLED.
Specifically, in the pixel circuit provided in the embodiment of the present invention, the third light-emitting control transistor is connected between the driving transistor and the electroluminescent device, and the third light-emitting control transistor and the second light-emitting control transistor are electrically connected to the same light-emitting control line, so that the third light-emitting control transistor and the second light-emitting control transistor are simultaneously turned on and off, and the third light-emitting control transistor is configured to electrically connect the electroluminescent device only in a light-emitting stage, and the electroluminescent device is not turned on even if a weak driving current is provided in other stages, thereby prolonging the service life of the electroluminescent device.
Optionally, in the pixel circuit provided in the embodiment of the present invention, as shown in fig. 4, the pixel circuit further includes: a data write transistor T4, a potential control transistor T5, a first reset transistor T6, a second reset transistor T7, and a capacitor C;
a Gate of the Data writing transistor T4 is electrically connected to the scanning signal line Gate, a first pole of the Data writing transistor T4 is electrically connected to the Data line Data, and a second pole of the Data writing transistor T4 is electrically connected to the first pole of the driving transistor DT;
a Gate of the potential control transistor T5 is electrically connected to the scanning signal line Gate, a first pole of the potential control transistor T5 is electrically connected to the Gate of the driving transistor DT, and a second pole of the potential control transistor T5 is electrically connected to the second pole of the driving transistor DT;
a gate electrode of the first Reset transistor T6 is electrically connected to the Reset control terminal Reset, a first pole of the first Reset transistor T6 is electrically connected to the initial signal terminal Vint, and a second pole of the first Reset transistor T6 is electrically connected to the gate electrode of the driving transistor DT;
a gate electrode of the second Reset transistor T7 is electrically connected to the Reset control terminal Reset, a first electrode of the second Reset transistor T7 is electrically connected to the initial signal terminal Vint, and a second electrode of the second Reset transistor T7 is electrically connected to an anode electrode of the electroluminescent device OLED;
a first electrode of the capacitor C is electrically connected to the gate electrode of the driving transistor DT, and a second electrode of the capacitor C is electrically connected to the first voltage signal terminal ELVDD.
The connection relationship and the working principle between the data writing transistor, the potential control transistor, the first reset transistor, the second reset transistor and the capacitor, and the connection relationship and the working principle between the corresponding transistor and the capacitor in the pixel circuit in the related art are not described herein again.
Based on the same inventive concept, an embodiment of the present invention further provides an array substrate, as shown in fig. 5, including: a plurality of pixel circuits provided in the above embodiments arranged in an array;
a plurality of data lines (not specifically shown in the drawings), the same data line being electrically connected to a column of pixel circuits;
a plurality of first light emission control signal lines EM1, the same first light emission control signal line EM1 being electrically connected to one column of pixel circuits;
the larger the load amount of the data line electrically connected to the same column of pixel circuits, the larger the duty ratio of the first light emission control signal loaded on the first light emission control signal line EM 1.
Specifically, in the array substrate provided by the embodiment of the present invention, the same row of pixel circuits is electrically connected to the same first light-emitting control signal line, that is, the same load amount of the same data line is the same, so that the time for providing the driving current to the pixel circuits connected to the same data line is the same, and the same brightness of the electroluminescent devices in the same row of pixel circuits is ensured. For data lines with different load amounts, the larger the load amount is, the smaller the driving current loaded by the corresponding pixel circuit is, so that the duration for loading the driving current needs to be increased to compensate for the magnitude of the driving current exceeding the loss of the load amount.
Optionally, in the array substrate provided in the embodiment of the present invention, the array substrate includes:
the same grid line is electrically connected with a row of pixel circuits;
a plurality of second light emission control signal lines electrically connected to the one row of pixel circuits;
the duty ratio of the second light-emitting control signal provided by the second light-emitting control signal line is greater than or equal to the maximum duty ratio of the first light-emitting control signal received by each pixel circuit connected with the second light-emitting control signal line.
Specifically, in the array substrate provided in the embodiment of the present invention, the same row of pixel circuits is electrically connected to the same second light emission control signal line, and the light emission shift register disposed in the frame region of the array substrate provides a control signal to the first light emission control signal line. The duty ratio of the second light-emitting control signal is greater than or equal to that of the first light-emitting control signal, so as to ensure that the driving current is always loaded into the electroluminescent device when the first light-emitting control transistor is turned on, if the duty ratio of the second light-emitting control signal is smaller than that of the first light-emitting control signal, the second light-emitting control transistor is already turned off at the stage that the first light-emitting control transistor is turned on, the second light-emitting control transistor is turned off, and the driving transistor cannot provide the driving current for the first light-emitting control transistor, so that even if the first light-emitting control transistor is turned on, the duration of loading the driving current is not prolonged.
Optionally, in the array substrate provided in the embodiment of the present invention, the array substrate includes: the display device comprises a display area, a binding area and a wiring area positioned between the display area and the binding area;
the display region includes a plurality of pixel regions defined by intersections of data lines and gate lines, and pixel circuits corresponding to the respective pixel regions;
the routing area comprises fan-out routing which corresponds to the data lines one by one, at least the first fan-out routing and the second fan-out routing have different resistances, and the resistance of the first fan-out routing is greater than that of the second fan-out routing;
the binding region comprises binding components, and the binding components are configured to provide the driving signals provided by the driving chip to the corresponding fan-out wires respectively;
the duty ratio of the first light-emitting control signal received by the pixel circuit corresponding to the first fan-out wiring is larger than the duty ratio of the first light-emitting control signal received by the pixel circuit corresponding to the second fan-out wiring.
Specifically, in the array substrate provided in the embodiment of the present invention, since the resistance of the first fan-out trace is greater than the resistance of the second fan-out trace, the driving current loaded by the pixel circuit corresponding to the first fan-out trace is smaller than the driving current loaded by the pixel circuit corresponding to the second fan-out trace, and thus, by increasing the duration for loading the driving current by the pixel circuit corresponding to the first fan-out trace, the difference between the driving current loaded by the pixel circuit corresponding to the first fan-out trace and the driving current loaded by the pixel circuit corresponding to the second fan-out trace is compensated.
Optionally, in the array substrate provided in the embodiment of the present invention, the larger the resistance of the fan-out trace is, the larger the duty ratio of the first lighting control signal received by the pixel circuit corresponding to the fan-out trace is.
Specifically, in the array substrate provided in the embodiment of the present invention, the larger the resistance of the fan-out trace is, the smaller the magnitude of the driving current loaded by the pixel circuit corresponding to the fan-out trace is, so that a longer time of loading the driving current is required to compensate for the difference in the magnitudes of the currents.
Optionally, in the array substrate provided in the embodiment of the present invention, the display area includes: the display device comprises a first sub-display area and a second sub-display area, wherein the first sub-display area and the second sub-display area are axially symmetrical along the extension direction of a data line;
in each sub-display area, along the extension of the grid line and in the direction pointing to the symmetry axis, the resistance of the fan-out routing lines respectively connected with each data line is reduced in sequence.
Specifically, in the array substrate provided in the embodiment of the present invention, the resistances of the fan-out traces connected to the data lines corresponding to the middle row of pixel circuits are smaller, and extend from the middle row to both sides along the extending direction of the gate line, and the resistances of the fan-out traces are sequentially increased, so that the duration of the current loaded to the pixel circuits in the middle row is minimized, and the durations of the driving current loaded to the pixel circuits in the extending directions of both sides are sequentially increased to compensate for the difference in the magnitudes of the driving currents. As shown in fig. 6, the duty ratio of the first light emission control signal line closer to the middle column is smaller.
Based on the same inventive concept, an embodiment of the present invention further provides a driving method of an array substrate, including:
providing first light-emitting control signals with different duty ratios to each pixel circuit according to the load of a data line for providing data signals;
wherein, the larger the load amount of the data line, the longer the time of loading the driving current.
Optionally, in the driving method of the array substrate provided in the embodiment of the present invention, the method further includes:
providing a second light-emitting control signal to each pixel circuit according to the duty ratio of the first light-emitting control signal line received by the pixel circuit connected with the same second light-emitting control signal line;
the duration of the second light-emitting control signal is greater than or equal to the maximum duration of the first light-emitting control signal received by each pixel circuit connected with the second light-emitting control signal line.
The principle and the implementation of the driving method of the array substrate are the same as those of the array substrate provided in the above embodiments, and the implementation may be specifically performed with reference to the embodiments of the array substrate, and are not described herein again.
Based on the same inventive concept, an embodiment of the present invention further provides a display panel, including the array substrate provided in any of the above embodiments.
The principle and implementation of the display panel are the same as those of the array substrate provided in the above embodiments, and the implementation may be specifically performed with reference to the embodiments of the array substrate, which is not described herein again.
Based on the same inventive concept, as shown in fig. 7, an embodiment of the present invention further provides a display device, including the display panel provided in any of the above embodiments.
The display device is suitable for various displays such as an Organic electroluminescent display, an inorganic electroluminescent display, an Active Matrix Organic Light Emitting Diode (AMOLED) display and the like. The display device may be: any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, etc., is not limited herein.
The embodiment of the invention provides a pixel circuit, an array substrate, a driving method thereof, a display panel and a display device, wherein the pixel circuit comprises: the electroluminescent device comprises a driving transistor, an electroluminescent device and a first light-emitting control transistor connected between the driving transistor and the electroluminescent device; the driving transistor is configured to provide a driving current to the electroluminescent device according to a received data signal; the first light emitting control transistor is configured to control a loading time period of the driving current according to a load amount of a data line providing the data signal, and the larger the load amount of the data line is, the longer the driving current is loaded. In the process of driving the pixel circuit, under the same driving voltage, the larger the load of the data line, the smaller the current loaded by the data line, which may cause the lower brightness of the electroluminescent device connected to the data line with large load at the same driving time.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (9)
1. An array substrate, comprising: a plurality of pixel circuits arranged in an array;
the pixel circuit includes: the electroluminescent device comprises a driving transistor, an electroluminescent device and a first light-emitting control transistor connected between the driving transistor and the electroluminescent device;
the driving transistor is configured to provide a driving current to the electroluminescent device according to a received data signal;
the first light emitting control transistor is configured to control a loading time period of the driving current according to a load amount of a data line providing the data signal, the larger the load amount of the data line is, the longer the driving current is loaded;
the grid electrode of the first light-emitting control transistor is electrically connected with a first light-emitting control signal line, the first pole of the first light-emitting control transistor is electrically connected with the second pole of the driving transistor, and the second pole of the first light-emitting control transistor is electrically connected with the anode of the electroluminescent device;
wherein the first lighting control signal line is configured to load a first lighting control signal, and the duty ratio of the first lighting control signal is larger the load amount of the data line is;
the pixel circuit further includes: a second light emission control transistor;
a gate of the second light emission control transistor is electrically connected to a second light emission control signal line, a first electrode of the second light emission control transistor is electrically connected to a first voltage signal terminal, and a second electrode of the second light emission control transistor is electrically connected to the first electrode of the driving transistor;
the second light-emitting control signal line is configured to be loaded with a second light-emitting control signal, and the duty ratio of the second light-emitting control signal is greater than or equal to the maximum duty ratio of the first light-emitting control signal received by each pixel circuit connected with the second light-emitting control signal line;
the pixel circuit further includes: a third light emission control transistor;
the third light-emitting control transistor and the second light-emitting control transistor are electrically connected with the same light-emitting control line;
a gate of the third light emission control transistor is electrically connected to the second light emission control signal line, a first electrode of the third light emission control transistor is electrically connected to a second electrode of the first light emission control transistor, and the second electrode of the third light emission control transistor is electrically connected to an anode of the electroluminescent device;
the array substrate further includes:
the same data line is electrically connected with a row of pixel circuits;
a plurality of first light emission control signal lines, the same one of which is electrically connected to one of the rows of the pixel circuits; the duty ratio of the first light-emitting control signal loaded by the first light-emitting control signal line is larger when the load amount of the data line electrically connected with the pixel circuit in the same column is larger;
a plurality of gate lines, the same gate line being electrically connected to one row of the pixel circuits;
and the same second light-emitting control signal line is electrically connected with one row of the pixel circuits.
2. The array substrate of claim 1, wherein the pixel circuit further comprises: a data writing transistor, a potential control transistor, a first reset transistor, a second reset transistor and a capacitor;
a gate of the data writing transistor is electrically connected to a scanning signal line, a first pole of the data writing transistor is electrically connected to the data line, and a second pole of the data writing transistor is electrically connected to the first pole of the driving transistor;
the grid electrode of the potential control transistor is electrically connected with the scanning signal line, the first pole of the potential control transistor is electrically connected with the grid electrode of the driving transistor, and the second pole of the potential control transistor is electrically connected with the second pole of the driving transistor;
the grid electrode of the first reset transistor is electrically connected with the reset control end, the first electrode of the first reset transistor is electrically connected with the initial signal end, and the second electrode of the first reset transistor is electrically connected with the grid electrode of the driving transistor;
the grid electrode of the second reset transistor is electrically connected with the reset control end, the first electrode of the second reset transistor is electrically connected with the initial signal end, and the second electrode of the second reset transistor is electrically connected with the anode of the electroluminescent device;
the first electrode of the capacitor is electrically connected with the grid electrode of the driving transistor, and the second electrode of the capacitor is electrically connected with the first voltage signal end.
3. The array substrate of claim 1, comprising: the display device comprises a display area, a binding area and a wiring area positioned between the display area and the binding area;
the display region includes a plurality of pixel regions defined by intersections of the data lines and the gate lines, and the pixel circuits corresponding to the respective pixel regions;
the routing area comprises fan-out routing lines which correspond to the data lines one by one, at least the first fan-out routing line and the second fan-out routing line have different resistances, and the resistance of the first fan-out routing line is greater than that of the second fan-out routing line;
the binding region comprises binding components, and the binding components are configured to provide driving signals provided by a driving chip to the corresponding fan-out routing lines respectively;
the duty ratio of the first light emitting control signal received by the pixel circuit corresponding to the first fan-out wiring is larger than the duty ratio of the first light emitting control signal received by the pixel circuit corresponding to the second fan-out wiring.
4. The array substrate of claim 3, wherein the greater the resistance of the fan-out trace, the greater the duty cycle of the first lighting control signal received by the pixel circuit corresponding to the fan-out trace.
5. The array substrate of claim 4, wherein the display area comprises: the display device comprises a first sub-display area and a second sub-display area, wherein the first sub-display area and the second sub-display area are axially symmetrical along the extending direction of a data line;
in each sub-display area, along the extending direction of the grid line and the direction of the symmetrical axis, the resistance of the fan-out routing line connected with each data line is reduced in sequence.
6. A driving method of the array substrate according to any one of claims 1 to 5, comprising:
providing first light-emitting control signals with different duty ratios to the pixel circuits according to the load of a data line for providing the data signals;
wherein, the larger the load amount of the data line, the longer the time of the driving current loading.
7. The driving method of the array substrate according to claim 6, further comprising:
providing a second light-emitting control signal to each pixel circuit according to the duty ratio of the first light-emitting control signal line received by the pixel circuit connected with the same second light-emitting control signal line;
the duration of the second light-emitting control signal is greater than or equal to the maximum duration of the first light-emitting control signal received by each pixel circuit connected with the second light-emitting control signal line.
8. A display panel comprising the array substrate according to any one of claims 1 to 5.
9. A display device characterized by comprising the display panel according to claim 8.
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