CN111599308B - Display device, control method thereof and electronic equipment - Google Patents

Display device, control method thereof and electronic equipment Download PDF

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Publication number
CN111599308B
CN111599308B CN202010601724.7A CN202010601724A CN111599308B CN 111599308 B CN111599308 B CN 111599308B CN 202010601724 A CN202010601724 A CN 202010601724A CN 111599308 B CN111599308 B CN 111599308B
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transistor
signal
control
pixel
circuit
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CN111599308A (en
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张蒙蒙
周星耀
高娅娜
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Wuhan Tianma Microelectronics Co Ltd
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Shanghai Tianma AM OLED Co Ltd
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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]
    • 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
    • G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
    • 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
    • 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]
    • G09G3/3266—Details of drivers for scan electrodes

Abstract

The embodiment of the invention provides a display device, a control method thereof and electronic equipment, wherein the display device comprises a display panel and a control circuit, and the control circuit is arranged in a control circuit arrangement area of the display panel; the display panel comprises a substrate, a scanning driving circuit, at least one virtual pixel and a plurality of sub-pixels, wherein the scanning driving circuit is positioned on one side of the substrate; each sub-pixel comprises at least one first transistor, and the dummy pixel is provided with a second transistor; the dummy pixel can output a threshold detection signal related to the threshold voltage of the second transistor according to the first reference signal and the second reference signal provided by the control circuit, so that the control circuit can output a corresponding control signal according to the threshold detection signal and control the scanning signal provided by the scanning driving circuit to control the first transistor in the sub-pixel to be switched on or switched off. According to the embodiment of the invention, the first transistor in the sub-pixel can be accurately controlled to be switched on or switched off, so that the display effect is improved.

Description

Display device, control method thereof and electronic equipment
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to a display device, a control method thereof and electronic equipment.
Background
The Organic Light-Emitting Diode (OLED) display panel has a wide application prospect because of its advantages of self-luminescence, high contrast, thin thickness, fast reaction speed, and applicability to flexible panels.
The OLED element of the OLED display panel belongs to a current-driven type element, and a corresponding pixel driving circuit needs to be provided to supply a driving current to the OLED element so that the OLED element can emit light. The pixel driving circuit of the OLED display panel generally includes a storage capacitor, a driving transistor, and other transistors electrically connected to the driving transistor. A scan driving circuit is generally provided in the active matrix OLED display, and the scan driving circuit can output a corresponding scan signal to control the transistors in the pixel driving circuit to be turned on or off. However, the threshold of the transistor is shifted due to the influence of the environment or the characteristics of the transistor, so that the scanning signal output by the scanning driving circuit cannot control the transistor in the pixel driving circuit to be turned off, thereby affecting the display effect of the display panel.
Disclosure of Invention
Embodiments of the present invention provide a display device, a control method thereof, and an electronic apparatus, so as to solve a technical problem in the prior art that a scan signal output by a scan driving circuit cannot control a corresponding transistor to be turned off due to transistor threshold drift, thereby affecting a display effect.
In a first aspect, an embodiment of the present invention provides a display device, including: a display panel and a control circuit; the display panel includes a display area and a non-display area surrounding the display area; the non-display area comprises a control circuit setting area; the control circuit setting area is used for setting the control circuit;
the display panel also comprises a substrate, a scanning driving circuit, at least one virtual pixel and a plurality of sub-pixels, wherein the scanning driving circuit, the at least one virtual pixel and the plurality of sub-pixels are positioned on one side of the substrate; the dummy pixels and the scanning drive circuit are both positioned in the non-display area; the sub-pixels are positioned in the display area, and the sub-pixels are arranged in an array;
the sub-pixel includes a pixel driving circuit and a light emitting element; the pixel driving circuit comprises a driving transistor and at least one first transistor; the driving transistor is used for providing driving current for the light-emitting element; the grid electrode of the first transistor is electrically connected with the scanning driving circuit; the first transistor is used for being switched on or switched off under the control of a scanning signal provided by the scanning driving circuit;
the dummy pixel includes a second transistor; the control end of the virtual pixel is electrically connected with the first reference signal end of the control circuit, the input end of the virtual pixel is electrically connected with the second reference signal end of the control circuit, and the output end of the virtual pixel is electrically connected with the signal receiving end of the control circuit; the virtual pixel is used for respectively receiving a first reference signal and a second reference signal output by the control circuit, and outputting a threshold detection signal according to the first reference signal and the second reference signal, so that the control circuit outputs a control signal according to the threshold detection signal and controls the scanning drive circuit to provide a scanning signal; wherein, the threshold detection signal V1 ═ V2 | -Vth 1 |; v2 is the second reference signal, and Vth1 is the threshold voltage of the second transistor.
In a second aspect, an embodiment of the present invention further provides a control method for a display device, where the control method is applied to the display device provided in the embodiment of the present invention, and the control method includes:
in a first stage, the control circuit outputs a first reference signal to the control end of the virtual pixel, and the control circuit outputs a second reference signal to the input end of the virtual pixel, so that the output end of the virtual pixel is the first reference signal;
in the second stage, the control circuit stops outputting the first reference signal to the control end of the virtual pixel, and the control circuit outputs the second reference signal to the input end of the virtual pixel until the output end of the virtual pixel is the threshold detection signal; wherein, the threshold detection signal V1 ═ V2 | -Vth 1 |; v2 is the second reference signal, Vth1 is the threshold voltage of the second transistor;
in a third stage, the threshold detection signal is output through the output end of the virtual pixel.
In a third aspect, an embodiment of the present invention further provides an electronic device including the display device provided in the embodiment of the present invention.
According to the display device, the control method thereof and the electronic device provided by the embodiment of the invention, the corresponding virtual pixel is arranged in the display panel of the display device, and the virtual pixel can output a threshold detection signal related to the threshold voltage of the second transistor when receiving the corresponding first reference signal and the second reference signal; because the virtual pixel and the sub-pixel are both arranged on one side of the substrate, the second transistor of the virtual pixel and the first transistor in the sub-pixel are in the same environment, and the threshold voltage of the first transistor and the threshold voltage of the second transistor have the same variation trend; therefore, the control circuit can acquire the variation trend of the threshold voltage of the second transistor according to the threshold detection signal so as to obtain the variation quantity of the threshold voltage of the first transistor, and output a corresponding control signal to the scanning drive circuit, so that the scanning signal output by the scanning drive circuit can accurately control the conduction or the closing of the first transistor, thereby preventing the phenomenon that the display effect of the display panel is influenced because the scanning signal output by the scanning drive circuit cannot control the conduction or the closing of the transistor in the pixel drive circuit, and further improving the display quality. Meanwhile, the change condition of the threshold voltage of the transistor in the display area is obtained by adopting the virtual pixel arranged in the non-display area, the real-time detection of the change condition of the threshold voltage of the transistor can be realized on the premise of not influencing the normal display luminescence of each sub-pixel, and the control signal output to the scanning driving circuit is timely adjusted after the detection, so that the scanning signal output by the scanning driving circuit can accurately control the first transistor to be switched on or switched off, an external detection device is not required to be adopted for detecting the threshold voltage of the transistor in the display area in the display panel, the detection efficiency is higher, and the detection cost is reduced.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
fig. 1 is a schematic structural diagram of a display device provided in the prior art;
fig. 2 is a schematic structural diagram of a display device according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a film structure of a display panel according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a virtual pixel according to an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of another virtual pixel provided in an embodiment of the present invention;
fig. 6 is a driving timing diagram of a dummy pixel corresponding to fig. 5;
FIG. 7 is a schematic structural diagram of a sub-pixel according to an embodiment of the present invention;
FIG. 8 is a schematic structural diagram of another display device according to an embodiment of the present invention;
FIG. 9 is a schematic structural diagram of another display device according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of another display device according to an embodiment of the invention;
fig. 11 is a schematic structural diagram of a signal conversion circuit according to an embodiment of the present invention;
fig. 12 is a specific circuit diagram of a signal conversion circuit according to an embodiment of the present invention;
fig. 13 is a specific circuit diagram of another signal conversion circuit according to an embodiment of the present invention;
FIG. 14 is a diagram illustrating a film structure of another display panel according to an embodiment of the present invention;
fig. 15 is a schematic structural diagram of another display device according to an embodiment of the invention;
fig. 16 is a flowchart of a control method of a display device according to an embodiment of the present invention;
fig. 17 is a flowchart of a control method of a display device according to another embodiment of the present invention;
fig. 18 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be fully described by the detailed description with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are a part of the embodiments of the present invention, not all embodiments, and all other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without inventive efforts fall within the scope of the present invention.
Fig. 1 is a schematic structural diagram of a display device in the related art, and as shown in fig. 1, a display device 0001 in the related art includes a display panel 001 and a driving chip 002. The display panel 001 includes a plurality of sub-pixels 010 arranged in an array, a scan driving circuit 020, a plurality of scan signal lines 030, and a plurality of data signal lines 040; each sub-pixel includes a pixel drive circuit 01 and a light emitting element 02, and the pixel drive circuit 01 includes a drive transistor T ' and another transistor electrically connected to the drive transistor T ' directly or indirectly, which may be, for example, a data write transistor M1 '. Since the sub-pixels 010 in the same row can share the scan signal line 030 and the sub-pixels 010 in the same column share the data signal line 040, the scan driving circuit 020 can supply a scan signal to the data writing transistor M1 'of the sub-pixel through the corresponding scan signal line 030 to control the data writing transistor M1' to be turned on or off; and when the data writing transistor M1' is turned on, the data signal provided by the driving chip 002 can be transmitted to the data writing transistor M1' of the corresponding sub-pixel 010 through the corresponding data signal line, and is written into the gate of the driving transistor T ' through the turned-on data writing transistor M1', so that the driving transistor T ' generates the corresponding driving current according to the data signal written into the gate thereof to drive the light emitting element 02 to emit light.
The scan signal provided by the scan driving circuit 020 is usually a pulse signal to control the corresponding transistor to be turned on or off in a specific time period, and the duty ratio, amplitude, and the like of the pulse signal are all related to the clock control signal provided by the driving chip 002. When the driving chip 002 provides a fixed clock control signal, the scan driving circuit 020 outputs a scan signal with a corresponding amplitude and duty ratio.
However, the transistor in the pixel driving circuit may have its threshold voltage shifted due to aging or environmental temperature, and at this time, the scan signal provided by the scan driving circuit cannot control the transistor in the pixel driving circuit to turn on or off, for example, when the scan signal provided by the scan driving circuit cannot control the data writing transistor of the previous row of sub-pixels to turn off, the data signal written to the gate of the driving transistor of the next row of sub-pixels will be written to the gate of the driving transistor of the previous row of sub-pixels through the turned-on data writing transistor, thereby affecting the gate potential of the driving transistor in the previous row of sub-pixels, so that the driving current generated by the driving transistor of the previous row according to the gate potential thereof will change, thereby affecting the light emitting brightness of the light emitting element 012 in the previous row of sub-pixels, and further affecting the display effect.
To solve the above technical problem, an embodiment of the present invention provides a display device, including: a display panel and a control circuit; the display panel comprises a display area and a non-display area surrounding the display area; the non-display area comprises a control circuit setting area; the control circuit setting area is used for setting a control circuit; the display panel also comprises a substrate, a scanning driving circuit, at least one virtual pixel and a plurality of sub-pixels, wherein the scanning driving circuit, the at least one virtual pixel and the plurality of sub-pixels are positioned on one side of the substrate; the virtual pixel and the scanning driving circuit are both positioned in the non-display area; the sub-pixels are positioned in the display area, and the plurality of sub-pixels are arranged in an array; the sub-pixel includes a pixel driving circuit and a light emitting element; the pixel driving circuit comprises a driving transistor and at least one first transistor; the driving transistor is used for providing a driving current for the light-emitting element; the grid electrode of the first transistor is electrically connected with the scanning driving circuit; the first transistor is used for being switched on or switched off under the control of a scanning signal provided by the scanning driving circuit; the dummy pixel includes a second transistor; the control end of the virtual pixel is electrically connected with the first reference signal end of the control circuit, the input end of the virtual pixel is electrically connected with the second reference signal end of the control circuit, and the output end of the virtual pixel is electrically connected with the signal receiving end of the control circuit; the virtual pixel is used for respectively receiving a first reference signal and a second reference signal output by the control circuit and outputting a threshold detection signal according to the first reference signal and the second reference signal, so that the control circuit outputs a control signal according to the threshold detection signal and controls the scanning driving circuit to provide a scanning signal; wherein, the threshold detection signal V1 ═ V2 | -Vth 1 |; v2 is the second reference signal, and Vth1 is the threshold voltage of the second transistor.
By adopting the technical scheme, the virtual pixel and the sub-pixel are arranged on one side of the substrate, so that the second transistor of the virtual pixel and the first transistor in the sub-pixel are in the same environment, and the threshold voltage of the first transistor and the threshold voltage of the second transistor have the same variation trend; on the one hand, by providing a corresponding dummy pixel in the display panel of the display device, the dummy pixel being capable of outputting a signal corresponding to the second transistor when receiving the corresponding first and second reference signals, so that the virtual pixel outputs a threshold detection signal related to the threshold voltage of the second transistor, and the control circuit can obtain the variation trend of the threshold voltage of the second transistor according to the threshold detection signal, so as to obtain the variation of the threshold voltage of the first transistor and output the corresponding control signal to the scan driving circuit, so that the scanning signal output by the scanning driving circuit can accurately control the first transistor to be switched on or switched off, therefore, the phenomenon that the display effect of the display panel is influenced because the scanning signals output by the scanning driving circuit cannot control the on or off of the transistors in the pixel driving circuit is prevented from being generated, and the display quality is improved; in a second aspect, the change of the threshold voltage of the transistor in the display area is obtained by using the dummy pixels disposed in the non-display area, so that the change of the threshold voltage of the transistor can be detected in real time without affecting the normal display and light emission of each sub-pixel, and the control signal output to the scan driving circuit is adjusted in time after the detection, so that the scan signal output by the scan driving circuit can accurately control the first transistor to be turned on or off, and therefore, the threshold voltage of the transistor in the display area in the display panel does not need to be detected by using an external detection device, and the detection efficiency is high, and the detection cost is reduced.
The above is the core idea of the present invention, and the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative work belong to the protection scope of the present invention.
In the embodiment of the present invention, at least one virtual pixel is disposed in the display panel, that is, one, two, or more virtual pixels may be disposed in the display panel, and on the premise that the core invention point of the embodiment of the present invention can be implemented, the embodiment of the present invention does not specifically limit the number of the virtual pixels disposed in the display panel.
Fig. 2 is a schematic structural diagram of a display device according to an embodiment of the present invention, and fig. 3 is a schematic structural diagram of a film layer of a display panel according to an embodiment of the present invention. As shown in fig. 2 and 3 in conjunction, the display device 100 includes a display panel 10 and a control circuit 20; the display panel 10 includes a display area 101 and a non-display area 102 surrounding the display area 101; the non-display area 102 includes a control circuit setting area for setting the control circuit 20. Illustratively, the control circuit 20 may include a driving chip, a flexible circuit board, and the like.
Correspondingly, the display panel 10 further includes a substrate 110, and a scan driving circuit 130, a dummy pixel 140 and a plurality of sub-pixels 120 located at one side of the substrate 110; the sub-pixels 120 are located in the display region 101, and the plurality of sub-pixels 120 are arranged in an array, and the scan driving circuit 130 and the dummy pixels 140 are located in the non-display region 102. The sub-pixel 120 includes a pixel driving circuit 121 and a light emitting element 122, the pixel driving circuit 121 includes a driving transistor T and at least one first transistor M1, and a gate of the first transistor M1 is electrically connected to the scan driving circuit 130, so that a scan signal provided by the scan driving circuit 130 can control the first transistor M1 to be turned on or off. For example, the first transistor M1 may be a transistor capable of receiving a data signal, and when the first transistor M1 is in a conducting state, the data signal received by the first transistor M1 can be written to the gate of the driving transistor T; the driving transistor T can generate a corresponding driving current according to the data signal written to the gate thereof to drive the light emitting element 122 to emit light.
Meanwhile, the dummy pixel 140 includes a second transistor M2, and the second transistor M2 and the first transistor M1 are both located at one side of the substrate, so that the second transistor M2 and the first transistor M1 are in the same environment. When the threshold shift of the first transistor M1 and the second transistor M2 occurs due to environmental influences, the threshold voltages of the second transistor M1 and the second transistor M2 have the same trend of change. At this time, when the control terminal of the dummy pixel 140 is electrically connected to the first reference signal terminal of the control circuit 20, the input terminal of the dummy pixel 140 is electrically connected to the second reference signal terminal of the control circuit 20, and the output terminal of the dummy pixel 140 is electrically connected to the signal receiving terminal of the control circuit 20, the dummy pixel 140 can receive the first reference signal Vg and the second reference signal V2 output by the control circuit 20, and output the threshold detection signal V1 according to the first reference signal Vg and the second reference signal V2, so that the control circuit 20 can output the control signal according to the threshold detection signal V2 and control the scan driving circuit 120 to provide the scan signal; wherein, the threshold detection signal V1 ═ V2 | -Vth 1 |; v2 is the second reference signal, and Vth1 is the threshold voltage of the second transistor, i.e. the threshold detection signal V1 is related to the actual threshold voltage of the second transistor.
For example, fig. 4 is a schematic structural diagram of a virtual pixel according to an embodiment of the present invention. As shown IN fig. 2 and 4, the gate electrode of the second transistor M2 may be electrically connected to the control terminal CON of the dummy pixel 120, the first electrode of the second transistor M2 may be electrically connected to the input terminal IN of the dummy pixel 120, the second electrode of the second transistor M2 may be electrically connected to the output terminal OUT of the dummy pixel 120, and the second electrode of the second transistor M2 is also electrically connected to the gate electrode thereof. At this time, when the control circuit 20 provides the first reference signal Vg to the control terminal CON of the dummy pixel 120 and provides the second reference signal V2 to the input terminal IN of the dummy pixel 120, the gate and the second electrode of the second transistor M2 are both the first reference signal Vg, so that the output terminal of the dummy pixel electrically connected to the second electrode of the second transistor M2 is the first reference signal Vg; and the first electrode of the second transistor M2 is a second reference signal V2. Taking the second transistor M2 as a P-type transistor as an example, if the voltage difference between the first reference signal Vg and the second reference signal V2 is less than the threshold voltage Vth1 of the second transistor M2, the second transistor M2 is in a conducting state. When the second transistor M2 is in a conducting state, the control circuit 20 may stop providing the first reference signal Vg to the control terminal of the dummy pixel 140; at this time, the second reference signal provided by the control circuit 20 to the input terminal of the dummy pixel 140 is transmitted to the second electrode of the second transistor M2 through the turned-on second transistor M2; since the second electrode of the second transistor M2 is electrically connected to the gate thereof, the potential of the second electrode of the second transistor M2 is the potential of the gate thereof; in the process that the control circuit 20 continuously provides the second reference signal to the input terminal of the dummy pixel 140, when the voltage difference between the gate potential of the second transistor M2 and the second reference signal V2 provided by the control circuit 20 is greater than the threshold voltage of the second transistor M2, the second transistor M2 is turned off, that is, when the second transistor M2 is turned off, the voltage V1 at the output terminal of the dummy pixel 140 is equal to V2 | Vth1|, and at this time, the dummy pixel 140 outputs the voltage at the output terminal thereof to the control circuit 20 as the threshold detection signal.
In this way, the threshold detection voltage V1 output by the dummy pixel 140 to the control circuit 20 is only related to the current threshold voltage of the second transistor M2, so that when the control circuit 20 obtains the threshold detection voltage V1, the current threshold voltage of the second transistor M2 can be known; by comparing the initial threshold voltage of the second transistor M2 with the current threshold voltage of the second transistor M2, the variation and the variation trend of the threshold voltage of the second transistor M2 can be obtained, and thus the variation and the variation trend of the threshold voltage of the first transistor M1 in the same environment as the second transistor M2 can be estimated; and the voltage of the scan signal for controlling the first transistor M1 to turn on or off is obtained according to the variation trend, the control circuit 20 can output a corresponding control signal to the scan driving circuit 130, so that the scan driving circuit 130 outputs a corresponding scan signal to the first transistor M1 of the corresponding sub-pixel 120, so as to accurately control the first transistor M1 of the sub-pixel 120 to turn on or off, and prevent the gate potential or output driving current of the driving transistor T from being affected by the abnormal turning on or off of the first transistor M1, so that the driving transistor T can provide a stable driving current to the light emitting element 122, and the light emitting element can stably emit light, thereby improving the display effect.
Meanwhile, since the dummy pixel 140 is directly disposed in the non-display area 101 of the display panel 10, the threshold voltage variation of the first transistor M1 in the sub-pixel 120 of the display area 101 can be directly estimated through the threshold variation of the second transistor M2 in the dummy pixel 140, so that the threshold voltage variation of the transistor can be detected in real time without affecting the normal display light emission of each sub-pixel 120, and the control signal output to the scan driving circuit 130 can be adjusted in time after the detection, so that the scan signal output by the scan driving circuit 130 can accurately control the first transistor M1 to be turned on or off, and therefore, the external detection device is not required to detect the threshold voltage of the transistor in the display area 101 of the display panel 100, which has high detection efficiency and reduces the detection cost.
It should be noted that, in the embodiment of the present invention, the channel types of the first transistor and the second transistor may be the same or different, and on the premise that the threshold voltage variation and the variation trend of the first transistor can be known through the threshold voltage variation and the variation trend of the second transistor, the channel types of the first transistor and the second transistor are not specifically limited in the embodiment of the present invention. For convenience of description, in the embodiments of the present invention, the channel types of the first transistor and the second transistor are taken as examples, and the technical solutions of the embodiments of the present invention are exemplarily described.
Alternatively, with continued reference to fig. 2 and 3, the second transistor M2 in the dummy pixel 140 may be formed of the same material and in the same process as the first transistor M1 in the sub-pixel 120; and the size of the second transistor M2 is the same as the size of the first transistor M1. Therefore, on one hand, when the second transistor M2 and the first transistor M1 are formed by using the same material in the same process, the process of the display device is simplified, the production efficiency of the display device is improved, and the production cost of the display device is reduced; on the other hand, when the second transistor M2 and the first transistor M1 are formed by the same material and have the same size in the same process, the second transistor M2 may have the same characteristics as the first transistor M1, and the threshold voltage variation and the variation trend of the second transistor M2 are the threshold voltage variation and the variation trend of the first transistor M1, so as to improve the efficiency and the accuracy of obtaining the threshold voltage variation of the first transistor M1, and further control the scan driving circuit 130 to output a corresponding scan signal according to the threshold voltage variation of the first transistor M1, so as to accurately control the on or off of the first transistor M1.
It should be noted that fig. 4 is an exemplary diagram of an embodiment of the present invention, and in the embodiment of the present invention, the dummy pixel may include other active or passive devices besides the second transistor, and when the threshold detection signal finally output by the dummy pixel is only related to the threshold voltage of the second transistor, the embodiment of the present invention does not specifically limit the specific structure of the dummy pixel. The active device may include, for example, a transistor, and the like, and the passive device may include, for example, a capacitor, a resistor, and the like.
For example, fig. 5 is a schematic structural diagram of another virtual pixel provided in the embodiment of the present invention. As shown in conjunction with fig. 2 and 5, the dummy pixel 140 includes a second transistor M2 and a first capacitor C1. A first end a1 of the first capacitor C1 receives a fixed voltage signal, and a second end a2 of the first capacitor C1 is electrically connected to the gate of the second transistor M2 and the first electrode of the second transistor M2; the gate of the second transistor M2 is the control terminal of the dummy pixel 140, the first electrode of the second transistor M2 is the output terminal of the dummy pixel 140, and the second electrode of the second transistor M2 is the input terminal of the dummy pixel 140.
Specifically, when the control circuit 20 provides the first reference signal Vg to the control terminal of the dummy pixel 140 and provides the second reference signal V2 to the input terminal of the dummy pixel 1410, the first reference signal Vg can initialize the second transistor M2 and the first capacitor C1, so that the second transistor M2 is turned on under the control of the first reference signal Vg and the second reference signal V2, and the second terminal a2 of the first capacitor C1 is the first reference signal Vg; when the control circuit 20 stops providing the first reference signal to the control terminal of the dummy pixel 140, the second reference signal V2 charges the first capacitor C1 through the turned-on second transistor M2 until the voltage level at the second terminal a2 of the first capacitor C1 is V2- | Vth1|, i.e., the gate voltage of the second transistor M2 is 2- | Vth1|, the second transistor M2 starts to turn off, and the second reference signal V2 cannot pass through the second transistor M2; at this time, the control circuit 20 obtains the potential of the second end a2 of the first capacitor C1, so that the current threshold voltage of the second transistor M2 can be obtained, and the variation trend of the threshold voltage of the second transistor M2 can be obtained; the variation and the variation trend of the threshold voltage of the first transistor M1 are obtained through the variation and the variation trend of the threshold voltage of the second transistor M2, so that the control signal provided to the scan driving circuit 130 is adjusted in time, and the scan signal output by the scan driving circuit 130 can accurately control the on or off of the first transistor M1, so as to prevent the driving current provided by the driving transistor T to the light emitting element 122 from being influenced by the non-on or non-off of the first transistor M1, thereby facilitating the improvement of the light emitting stability of the light emitting element 122 and improving the display effect.
In the embodiment of the present invention, the second transistor M2 may be a P-type transistor or an N-type transistor. The voltage difference between the grid electrode of the P-type transistor and the first electrode of the P-type transistor is smaller than the threshold voltage of the P-type transistor, the P-type transistor is switched on, and the P-type transistor is switched off in other situations; the N-type transistor is turned on when the voltage difference between the gate and the first electrode is greater than the threshold voltage, and is turned off in other cases. The operation principle of the dummy pixel shown in fig. 5 will be exemplarily described below by taking the second transistor M2 as an example of a P-type transistor.
Illustratively, fig. 6 is a driving timing diagram of a dummy pixel corresponding to fig. 5. As shown in fig. 2, 5 and 6, in the first phase t1, the control circuit 20 provides a first reference signal Vg to the control terminal of the dummy pixel 140 to initialize the second transistor M2 and the first capacitor C1; meanwhile, the control circuit 20 also provides the second reference signal V2 with a low level, so that the voltage difference between the first reference signal Vg at the gate of the second transistor M2 and the second reference signal V2 at the first electrode thereof can satisfy the turn-on condition of the second transistor M2. In the second phase t2, the control circuit 20 stops providing the first reference signal Vg to the control terminal of the dummy pixel 140, and at the same time, the control circuit 20 provides the second reference signal V2 with a high level to the input terminal of the dummy pixel 140, the second reference signal V2 with the level is written to the second terminal a2 of the first capacitor C1 through the turned-on second transistor M2 until the potential at the second terminal a2 of the first capacitor C1 is V2- | Vth1|, so that the potential difference between the gate of the second transistor M2 and the first electrode thereof is equal to the threshold voltage thereof, and the second transistor M2 starts to turn off. In the third stage t3, the second transistor M2 is turned off, and the control circuit 20 collects the potential of the second end a2 of the first capacitor C1, that is, the threshold detection signal V1 is output to the control circuit 20 through the output end of the dummy pixel 140, so that the control circuit 20 can provide a control signal to the scan driving circuit 130 according to the threshold detection signal to control the scan driving circuit 130 to provide the scan signal to the first transistor M1, thereby accurately controlling the on/off of the first transistor M1, enabling the light emitting element 122 to stably emit light, and further improving the display effect of the display panel.
When the first electrode of the driving transistor T is electrically connected to the first power supply, the first terminal a1 of the first capacitor C1 receives the fixed voltage signal VDD as the voltage signal of the first power supply. Therefore, a corresponding signal transmission line is not required to be arranged for the fixed voltage signal VDD independently, the structure of the display panel is simplified, the number of signal pins arranged in the control circuit and the display panel is reduced, and the cost of the display panel and the control circuit is reduced.
In the embodiment of the present invention, the pixel driving circuit of each sub-pixel includes at least one first transistor and a driving transistor, that is, the pixel driving circuit of each sub-pixel in the display device provided by the embodiment of the present invention may include one, two or more first transistors; in addition, other components can be included in the pixel driving circuit.
For example, fig. 7 is a schematic structural diagram of a sub-pixel according to an embodiment of the present invention. As shown in fig. 7, the pixel driving circuit of each sub-pixel includes seven transistors, which are a driving transistor T, an initialization transistor M11, a data writing transistor M12, a threshold compensation transistor M13, a first light emission controlling transistor M14, a second light emission controlling transistor M15, and a reset transistor M16, respectively, and a storage capacitor Cst. The gate of the initialization transistor M11 receives the first Scan signal Scan1, and is turned on or off under the control of the first Scan signal Scan1, and when the initialization transistor M11 is controlled to be turned on by the first Scan signal Scan1, the initialization signal Vref received by the second electrode of the initialization transistor M11 is written to the gate of the driving transistor T and the second end of the storage capacitor Cst, so as to initialize the driving transistor T and the storage capacitor Cst; the gate of the Data writing transistor M12 and the gate of the threshold compensating transistor M13 both receive the second Scan signal Scan2, so that the gate of the Data writing transistor M12 and the threshold compensating transistor M13 can be turned on or off under the control of the second Scan signal Scan2, and when the gate of the Data writing transistor M12 and the threshold compensating transistor M13 are controlled to be turned on by the second Scan signal Scan2, the Data signal Data received by the Data writing transistor M12 can be written to the gate of the driving transistor T, so that the gate potential of the driving transistor T is related to the threshold voltage of the driving transistor T; the gate of the reset transistor M16 receives the third Scan signal Scan3 and is turned on or off under the control of the third Scan signal Scan 3; the first electrode of the reset transistor M16 receives the reset signal Rset, and the second electrode of the reset transistor M16 is electrically connected to the anode of the light emitting element 22, so that the reset signal Rset can be supplied to the anode of the light emitting element 22 to reset the anode of the light emitting element 22 when the third Scan signal Scan3 controls the reset transistor M16 to be turned on; the gates of the first and second emission control transistors M14 and M15 both receive the emission control signal Emit, so that the first and second emission control transistors M14 and M15 can be turned on or off under the control of the emission control signal Emit; a first electrode of the first light emission control transistor M14 receives the first power voltage signal PVDD, and a second electrode of the first light emission control transistor M14 is electrically connected to the first electrode of the driving transistor T; a first electrode of the second light emission controlling transistor M15 is electrically connected to a second electrode of the driving transistor T, a second electrode of the second light emission controlling transistor M15 is electrically connected to an anode of the light emitting element 22, and a cathode of the light emitting element 22 receives a second power voltage signal PVEE; the first power voltage signal PVDD is different from the second power voltage signal PVEE, so that when the emission control signal Emit controls the first emission control transistor M14 and the second emission control transistor M15 to be turned on, a loop is formed between the first electrode of the first emission control transistor M14 receiving the first power voltage signal PVDD and the cathode of the light emitting element 22 receiving the second power voltage signal PVEE, so that the driving current generated by the driving transistor T according to the Data signal Data flows into the light emitting element 22, and the light emitting element 22 is controlled to Emit light. At this time, the fixed voltage signal received by the first terminal of the first capacitor in the dummy pixel may be the first power voltage signal PVDD.
The first Scan signal Scan1, the second Scan signal Scan2, the third Scan signal Scan3 and the emission control signal Emit can be provided by a Scan driving circuit. At this time, the initialization transistor M11, the data write transistor M12, the threshold compensation transistor M13, the first light emission control transistor M14, the second light emission control transistor M15, and the reset transistor M16 may all be first transistors. For convenience of description, the embodiment of the present invention takes the data writing transistor M12 as an example of the first transistor, and the technical solution of the embodiment of the present invention is exemplarily explained.
Optionally, with reference to fig. 2, the display panel 10 further includes a plurality of scan signal lines 150 and a plurality of data signal lines 160, and the first transistors M1 of the sub-pixels 120 in the same row are electrically connected to the scan driving circuit 130 through the same scan signal line 150, and the first transistors M1 of the sub-pixels 120 in the same column are electrically connected to the same data signal line 160.
Specifically, when the first transistors M1 of the sub-pixels located in the same row share the scan signal line 150, the scan signal provided by the scan driving circuit 130 can be sequentially provided to the gates of the first transistors M1 of the sub-pixels 120 in each row through each scan signal line 150, so as to sequentially control the first transistors M1 of the sub-pixels 120 in each row to be turned on; accordingly, the data signal transmitted by the data signal line 160 is written to the gate of the driving transistor T of the corresponding sub-pixel 120 through the turned-on first transistor M1. Illustratively, when a data signal needs to be written into the gate of the driving transistor T of the second row of sub-pixels, the scanning driving circuit 130 provides the scanning signal to control the first transistor M1 of the second row of sub-pixels to be turned on, and controls the first transistor M1 of the other row of sub-pixels to be turned off, so as to prevent the data signal transmitted through the data signal line 160 and written into the gate of the driving transistor T of the second row of sub-pixels from being written into the other row of sub-pixels, and to affect the gate potentials of the driving transistors of the other row of sub-pixels, so that the driving transistors T of the other row of sub-pixels are changed according to the gate potentials provided to the light-emitting elements 122, and the light-emitting stability of the light-emitting elements 122 of the other row of sub-pixels is affected. Thus, when the scan signal provided by the scan driving circuit 130 can accurately control the first transistor M1 of each row of sub-pixels to be turned on or off, the light emitting elements 122 of each row of sub-pixels can be made to emit light stably, thereby improving the display effect.
While the above description has been given by taking an example in which one dummy pixel is disposed on the substrate side of the display panel, in the embodiment of the present invention, a plurality of dummy pixels may be disposed on the substrate side of the display panel, for example, the dummy pixels may be disposed in one-to-one correspondence with each row of sub-pixels, in one-to-one correspondence with each column of sub-pixels, or in one-to-one correspondence with each sub-pixel in the display panel.
For example, fig. 8 is a schematic structural diagram of another display device provided in the embodiment of the present invention. As shown in fig. 8, the display panel 10 includes a plurality of dummy pixels 140, and the plurality of dummy pixels 140 are sequentially arranged in the column direction Y of the sub-pixels 120. At this time, a plurality of dummy pixels 140 that can be disposed on the display panel may be disposed in one-to-one correspondence with each row of sub-pixels, or one dummy pixel 140 may correspond to a plurality of rows of sub-pixels, or a plurality of dummy pixels 140 may correspond to a row of sub-pixels.
For example, taking an example that one virtual pixel 140 corresponds to one row of sub-pixels, the environment of the second transistor M2 of the virtual pixel 140 is the same as the environment of the first transistor M1 of the sub-pixel 120 of the row corresponding to the virtual pixel 140, so that the threshold voltage of the second transistor M2 of the virtual pixel 140 and the threshold voltage of the first transistor M1 of the sub-pixel of the corresponding row have the same trend of change. At this time, a first reference signal transmission line 171, a second reference signal transmission line 172, and a plurality of detection signal lines corresponding to the dummy pixels 140 one by one may be further disposed on one side of the substrate of the display panel 10, so that each dummy pixel 140 can output a corresponding threshold detection signal according to the first reference signal transmitted by the first reference signal transmission line 171 and the second reference signal transmitted by the second reference signal transmission line 172, and transmit the threshold detection signal to the control circuit 20 through the corresponding detection signal line 173, so that the control circuit 20 can adjust the control signal outputted to the scan driving circuit 130 in time according to the threshold detection signal, so that the scan driving circuit can output a corresponding scan signal to the gate of the first transistor M1 of the sub-pixel 120 of the corresponding row of the dummy pixel 140, and accurately controls the first transistor M1 of the row of sub-images 120 to be turned on or off, thereby improving the display effect.
Since the dummy pixels 140 are sequentially arranged along the row direction Y of the sub-pixels 120, the detection signal lines 173, the first reference signal transmission lines 171 and the second reference signal transmission lines 172 electrically connected to the dummy pixels 140 can all extend along the row direction Y of the sub-pixels 120, so that the detection signal lines 173, the first reference signal transmission lines 171 and the second reference signal transmission lines 172 can be formed by the same material and in the same process as the data signal lines 160 extending along the row direction Y of the sub-pixels 120, thereby simplifying the manufacturing process of the display panel 10, reducing the cost of the display device 100, and facilitating the thinning of the display device.
In the display device shown in fig. 8, the detection signal lines 173 are provided in one-to-one correspondence with the dummy pixels 140 so that the threshold voltage variation of the first transistors M1 of the sub-pixels in the row corresponding to each dummy pixel 140 can be known from the threshold detection signal output from each dummy pixel 140. In the embodiment of the invention, each dummy pixel can transmit the threshold detection signal to the control circuit through the same detection signal line.
For example, fig. 9 is a schematic structural diagram of another display device provided in the embodiment of the present invention. As shown in fig. 9, one detection signal line 173 is disposed on one side of the substrate of the display panel 10, and the output end of each dummy pixel 140 is electrically connected to the signal receiving end of the control circuit 20 through the detection signal line 173, so that the control circuit 20 can obtain the threshold detection signal output by each dummy pixel 140 through the detection signal line 173, and can obtain the threshold voltage variation condition of the second transistor M2 according to the threshold detection signal output by each dummy pixel 140, thereby improving the accuracy of the obtained threshold voltage variation condition, and when outputting the control signal to the scan driving circuit 130 according to the threshold detection signal, the scan signal output by the scan driving circuit 130 can accurately control the on/off of the first transistor M1 of each sub-pixel. The detection signal lines 173 and the data signal lines 160 are disposed on one side of the substrate and on the same layer, so that the detection signal lines 173 and the data signal lines 160 can be formed by the same material and in the same process, thereby simplifying the manufacturing process of the display panel 10, reducing the cost of the display device 100, and facilitating the thinning of the display device.
In this embodiment of the present invention, the control circuit of the display device may be composed of a driving chip and a corresponding signal conversion circuit, and on the premise that the control signal provided by the control circuit can control the scan driving circuit to provide a corresponding scan signal, so as to accurately turn on or off the first transistor M1 of the sub-pixel in the corresponding row, the structure of the control circuit is not specifically limited in this embodiment of the present invention.
Optionally, fig. 10 is a schematic structural diagram of another display device provided in the embodiment of the present invention. As shown in fig. 10, the control circuit 20 of the display device 100 may include at least one signal conversion circuit 210 and a driving chip 220; the signal input pin of the driving chip 220 is the signal receiving end of the control circuit 20; the driving chip 220 is configured to output a first level signal Vgh1 according to the threshold detection signal; the control end of the signal conversion circuit 210 is electrically connected to the first output pin of the driving chip 220, and the output end of the signal conversion circuit 210 is electrically connected to the scan driving circuit 130; the signal conversion circuit 210 is configured to receive the first level signal Vgh1, and output a control signal Vcon to the scan driving circuit 130 according to the first level signal Vgh1, so that the scan driving circuit 130 provides a scan signal according to the control signal Vcon.
It should be noted that fig. 10 is a diagram illustrating an embodiment of the present invention, and in fig. 10, the control circuit 20 includes a signal conversion circuit 210 and a driving chip 220; in this embodiment of the present invention, the control circuit includes at least one signal conversion circuit, that is, the control circuit may include one, two, or more signal conversion circuits, which is not specifically limited in this embodiment of the present invention. For convenience of description, in the embodiments of the present invention, the control circuit includes a signal conversion circuit as an example, and the technical solutions of the embodiments of the present invention are exemplarily described.
For example, as shown in fig. 10, when the driving chip 210 of the control circuit 20 receives the threshold detection signal output by the dummy pixel 140, it can output a corresponding first level signal Vgh1 to the control terminal of the signal conversion circuit 210, so that the signal conversion circuit 210 can output a corresponding control signal Vcon to the scan driving circuit 130 according to the first level signal Vgh1, so that the scan driving circuit 130 can provide a corresponding scan signal to the first transistor M1 of the sub-pixel 120, thereby accurately controlling the first transistor M1 to be turned on or off, ensuring that the light emitting element 122 can stably emit light, and further improving the display effect.
In the embodiment of the present invention, the signal conversion circuit may be composed of a plurality of active and/or passive devices, and on the premise that the functions of the signal conversion circuit can be realized, the structure of the signal conversion circuit is not specifically limited in the embodiment of the present invention. The active device may be, for example, a transistor, and the passive device may be, for example, a resistor, a capacitor, or the like.
Optionally, fig. 11 is a schematic structural diagram of a signal conversion circuit according to an embodiment of the present invention. As shown in fig. 10 and 11, the signal conversion circuit may include a switch module 211 and a voltage division module 212; the control end of the switch module 211 is electrically connected to the first output pin of the driving chip 220; a first end of the switch module 211 is electrically connected to a second output pin of the driving chip 220; the second output pin of the driver chip 220 is used for outputting a second level signal Vgh 2; the switch module 211 is configured to generate a divided current according to a voltage difference between the first level signal Vgh1 and the second level signal Vgh 2; the first end of the voltage dividing module 212 is electrically connected to the third output pin of the driving chip 220, and the second end of the voltage dividing module 212 and the second end of the switch module 211 are electrically connected to the first node a 1; the first node a1 is the output terminal of the signal conversion circuit 210; the third output pin of the driver chip 220 is used for outputting a third level signal Vgh 3; the voltage dividing module 212 is configured to divide the voltage of the third level signal Vgh3 according to the divided current, so that the signal conversion circuit 210 outputs the control signal Vcon to the scan driving circuit 130; the voltage of the second level signal Vgh2 is different from the voltage of the third level signal Vgh3, and the second level signal Vgh2 and the third level signal Vgh3 are both constant voltage signals.
Specifically, when the first level signal Vgh1 and the second level signal Vgh2 provided by the driving chip 220 control the switch module 211 to turn off, the switch module 211 cannot generate a corresponding divided current, and at this time, the third level signal Vgh3 can directly pass through the voltage dividing module 212 and then output a corresponding control signal Vcon to the three driving circuits 130; when the first level signal Vgh1 and the second level signal Vgh2 provided by the moving chip 220 control the switch module 211 to be turned on, the turned-on switch module 211 can generate a corresponding divided current according to the voltage difference between the first level signal Vgh1 and the second level signal Vgh2, and the divided current can control the magnitude of the potential difference between the two ends of the voltage dividing module 212; when the second level signal Vgh2 and the third level signal Vgh3 are both fixed values, the divided current can control the potential of the first node a1, that is, the magnitude of the control signal Vcon output by the signal conversion circuit can be adjusted, so that the scan driving circuit 130 can generate different scan signals according to different control signals Vcon, and the first transistor M1 can be accurately controlled to be turned on or off.
Optionally, the switch module in the signal conversion circuit provided in the embodiment of the present invention may be, for example, a third transistor, where the third transistor can generate a corresponding divided current according to a voltage difference between a gate of the third transistor and a first electrode of the third transistor; at this time, the gate of the third transistor may be a control end of the switch module, the first electrode of the third transistor may be a first end of the switch module, and the second electrode of the third transistor may be a second end of the switch module; or the first electrode of the third transistor is the control end of the switch module, the gate of the third transistor is the first end of the switch module, and the second electrode of the third transistor is the second end of the switch module.
Illustratively, fig. 12 is a specific circuit diagram of a signal conversion circuit according to an embodiment of the present invention. As shown in fig. 12, the switch module of the signal conversion circuit includes a third transistor M3, and the voltage dividing module may include a voltage dividing resistor R1. When the gate of the third transistor M3 is the first terminal of the switch module, the first electrode of the third transistor M3 is the control terminal of the switch module, and the second electrode of the third transistor M3 is the second terminal of the switch module, the divided current I generated by the third transistor M3 is:
I＝K(Vsg-|Vth|)2＝K(Vgh1-Vgh2-|Vth2|)2
wherein the content of the first and second substances,
Figure BDA0002558749800000221
μ is the mobility of the carrier in the third transistor M3, Cox is the channel capacitance per unit area in the third transistor M3,
Figure BDA0002558749800000222
for the width-to-length ratio of the third transistor M3, Vth2 is the threshold voltage of the third transistor M3. Thus, the voltage of the first level signal Vgh1 input to the first electrode of the third transistor M3 can be controlled to make the third transistor M3 generate a corresponding divided current, and the purpose of adjusting the potential of the first node a1 is achieved after voltage division is performed by using the voltage dividing resistor R1, so that when the signal conversion circuit outputs the control signal Vcon to the scan driving circuit 130, the scan driving circuit 130 can provide a corresponding scan signal to the gate of the first transistor M1 of the corresponding sub-pixel, thereby controlling the first transistor M1 to be accurately turned on or turned off.
For example, fig. 13 is a specific circuit diagram of another signal conversion circuit provided in the embodiment of the present invention. Fig. 13 is the same as fig. 12, reference may be made to the description of fig. 12, and only the differences from fig. 12 in fig. 13 will be exemplarily described. As shown in fig. 13, the gate of the third transistor M3 is the control terminal of the switch module, the first electrode of the third transistor M3 is the first terminal of the switch module, and the second electrode of the third transistor M3 is the second terminal of the switch module. At this time, the divided current I generated by the third transistor M3 is:
I＝K(Vsg-|Vth|)2＝K(Vgh2-Vgh1-|Vth2|)2
in this way, the voltage of the first level signal Vgh1 input to the gate of the third transistor M3 can be controlled, and the magnitude of the divided current generated by the third transistor M3 can be controlled, so that the purpose of adjusting the potential of the first node a1 after voltage division is performed by using the first resistor R1 is achieved, and thus when the signal conversion circuit outputs the control signal Vcon to the scan driving circuit 130, the scan driving circuit 130 can provide a corresponding scan signal to the gate of the first transistor M1 of the corresponding sub-pixel, so as to control the first transistor M1 to be accurately turned on or turned off.
Optionally, fig. 14 is a schematic view of a film structure of another display panel provided in an embodiment of the present invention. As shown in fig. 14, when the switch module of the signal conversion circuit includes the third transistor M3, the third transistor M3 and the second transistor M2 may be formed by using the same material in the same process, so as to simplify the process of the display device, reduce the manufacturing cost of the display device, and facilitate the thinning of the display device. Meanwhile, the size of the third transistor M3 may be the same as that of the second transistor M2, so that the third transistor M3 has the same threshold voltage as the second transistor M2. Thus, when the driving chip knows the threshold voltage of the second transistor M2 through the threshold detection signal output by the dummy pixel 140, the threshold voltage of the third transistor M3 can be known, so that the first level signal Vgh1 provided to the signal conversion circuit can be determined according to the threshold voltage of the third transistor M3, so that the third transistor M3 can generate a corresponding divided current according to the first level signal Vgh1, and the voltage dividing module divides the third level signal v 3 according to the divided current, so as to adjust the potential of the first node a1, that is, adjust the magnitude of the control signal Vcon output to the scan driving circuit, and further enable the scan driving circuit to provide a corresponding scan signal according to the control signal Vcon, so as to control the first transistor M1 to be accurately turned on or off.
Accordingly, with continued reference to fig. 14, when the switch module of the signal conversion circuit includes the third transistor M3 and the voltage dividing module of the signal conversion circuit includes the voltage dividing resistor R1, the display panel may include a semiconductor layer on the substrate 110 side, which may include the active layer S1 of the first transistor M1, the active layer S2 of the second transistor M2, the active layer S3 of the third transistor M3, and the voltage dividing resistor R1; thus, the voltage dividing resistor R1 and the active layers (S1, S2 and S3) of the transistors (M1, M2 and M3) can be arranged at the same layer, so that the process can be simplified, the production cost can be reduced, and the display device is beneficial to thinning.
The doping concentration of the voltage-dividing resistor R1 is greater than the doping concentration of the active layer S3 of the third transistor M3, and/or the length of the short side of the voltage-dividing resistor R1 is the same as the length of the short side of the active layer of the third transistor M3, and the length of the long side of the voltage-dividing resistor R1 is n (10 ≦ n ≦ 50) times the length of the short side of the voltage-dividing resistor R1, so that the voltage-dividing resistor R1 can have a sufficiently large resistance value, and when the third transistor M3 generates a voltage-dividing current, the voltage-dividing resistor R1 can divide the third level signal Vgh3 according to the voltage-dividing current, thereby adjusting the magnitude of the control signal Vcon output by the signal conversion circuit.
Optionally, fig. 15 is a schematic structural diagram of another display device provided in the embodiment of the present invention. As shown in fig. 15, the control circuit 20 of the display device 100 may further include a flexible circuit board 230, the flexible circuit board 230 may be directly bound to the control circuit setting region of the display panel 10, and the driving chip 220 may be disposed on the flexible circuit 230. When the voltage dividing module includes a voltage dividing resistor, the voltage dividing resistor may be disposed in the flexible circuit board 230. Thus, only one side of the substrate of the display panel 10 needs to be formed with the switch module, so that the manufacturing process of the display panel 10 can be simplified, and the manufacturing cost of the display panel 10 can be reduced; meanwhile, when the voltage dividing resistor of the voltage dividing module is disposed in the flexible circuit board 230, the area of the non-display area 102 of the display panel 10 occupied by the signal conversion circuit 210 can be reduced, thereby facilitating a narrow frame of the display panel 10.
Based on the same inventive concept, the embodiment of the invention also provides a control method of the display device, and the control method of the display device is applied to the display device provided by the embodiment of the invention. Fig. 16 is a flowchart of a control method of a display device according to an embodiment of the present invention. As shown in fig. 16, the control method of the display device includes:
s110, in the first stage, the control circuit outputs a first reference signal to the control end of the virtual pixel, and the control circuit outputs a second reference signal to the input end of the virtual pixel, so that the output end of the virtual pixel is the first reference signal;
s120, in the second stage, the control circuit stops outputting the first reference signal to the control end of the virtual pixel, and the control circuit outputs the second reference signal to the input end of the virtual pixel until the output end of the virtual pixel is a threshold detection signal; wherein, the threshold detection signal V1 ═ V2 | -Vth 1 |; v2 is the second reference signal, Vth1 is the threshold voltage of the second transistor;
s130, in the third stage, the threshold detection signal is outputted through the output terminal of the dummy pixel.
In this way, in the first stage, the control circuit provides the first reference signal to the control terminal of the virtual pixel and provides the second reference signal to the input terminal of the virtual pixel, so that the output terminal of the virtual pixel is adjusted to the first reference signal to initialize the potential of the output terminal of the virtual pixel; in the second stage, the control circuit stops providing the first reference signal to the control terminal of the dummy pixel, but keeps providing the second reference signal to the input terminal of the dummy pixel, and the second reference signal at this time may be the same as or different from the second reference signal provided in the first stage; when the second stage is finished, the second reference signal provided by the control circuit adjusts the output end of the second reference signal from the first reference signal to a threshold detection signal, and the threshold detection signal is a signal related to the threshold voltage of the second transistor; in the third stage, the control threshold detection signal is output to the control circuit, so that the control circuit can know the threshold voltage change condition of the second transistor according to the threshold detection signal, and accordingly, the control circuit can output a corresponding control signal to the scanning driving circuit according to the threshold voltage change condition of the first transistor in the same environment as the second transistor, so that the scanning signal provided by the scanning driving circuit can accurately control the first transistor to be switched on or switched off, the light-emitting element can stably emit light, and the display effect of the display device can be improved.
Optionally, fig. 17 is a flowchart of a control method of another display device according to an embodiment of the present invention. As shown in fig. 5, when the dummy pixel 140 includes the second transistor M2 and the first capacitor C1; a first end a1 of the first capacitor C1 receives the fixed voltage signal VDD, and a second end a2 of the first capacitor C1 is electrically connected to the gate of the second transistor M2 and the first electrode of the second transistor M2; when the gate of the second transistor M2 is the control terminal CON of the dummy pixel 140, the first electrode of the second transistor M2 is the output terminal of the dummy pixel 140, and the second electrode of the second transistor M2 is the input terminal of the dummy pixel 140, as shown in fig. 17, the control method of the display device specifically includes:
s210, in the first stage, a first reference signal and a second reference signal output by the control circuit control the conduction of a second transistor, and reset the second end of the first capacitor;
s220, in the second stage, the control circuit stops outputting the first reference signal, and a second reference signal output by the control circuit is written into the second end of the first capacitor through the conducted second transistor until the second end of the first capacitor is a threshold detection signal;
s230, in the third stage, the second transistor is turned off, and the threshold detection signal is outputted through the output terminal of the dummy pixel.
In this way, in the first stage, the first reference signal and the second reference signal provided by the control circuit can satisfy the conduction condition of the second transistor M2, so that the second transistor M2 is turned on, and at the same time, the first reference signal provided by the control circuit is transmitted to the second end a2 of the first capacitor C1 electrically connected to the gate of the second transistor M2, so as to reset the second end a2 of the first capacitor C1, so that the output end of the dummy pixel 140 is the first reference signal; in the second stage, the control circuit stops providing the first reference signal and starts providing the high-level second reference signal, the high-level second reference signal can be transmitted to the second end a2 of the first capacitor C1 through the turned-on second transistor M2 to charge the first capacitor C1, until the potential of the second end a2 of the first capacitor C1 is the potential of the threshold detection signal, the potential difference between the gate of the second transistor M2 and the first electrode thereof cannot satisfy the turn-on condition of the second transistor M2, so that the second transistor M2 is turned off; in the third stage, the second transistor M2 is in a turned-off state, and when the second transistor M2 is turned off, the threshold detection signal of the second terminal a2 of the first capacitor C1 is output to the control circuit through the output terminal of the dummy pixel, so that the control circuit can know the threshold voltage variation condition of the second transistor according to the threshold detection signal, and output a corresponding control signal to the scan driving circuit according to the threshold voltage variation condition of the first transistor in the same environment as the second transistor, so that the scan signal provided by the scan driving circuit can accurately control the first transistor to be turned on or off, and further the light emitting element can stably emit light, which is beneficial to improving the display effect of the display device.
Based on the same inventive concept, embodiments of the present invention further provide an electronic device, where the electronic device includes the display device provided in any embodiment of the present invention, so that the electronic device provided in the embodiments of the present invention has the technical features and advantages of the display device provided in the embodiments of the present invention, and reference may be made to the above description of the display device provided in the embodiments of the present invention for the same points.
For example, fig. 18 is a schematic structural diagram of an electronic device according to an embodiment of the present invention. As shown in fig. 18, an electronic device 200 provided in an embodiment of the present invention includes the display apparatus 100 provided in an embodiment of the present invention. The electronic device 200 may be any electronic device with a display function, such as a mobile phone, a tablet computer, a notebook computer, a television, or a wearable device.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (16)

1. A display device, comprising: a display panel and a control circuit; the display panel includes a display area and a non-display area surrounding the display area; the non-display area comprises a control circuit setting area; the control circuit setting area is used for setting the control circuit;
the display panel also comprises a substrate, a scanning driving circuit, at least one virtual pixel and a plurality of sub-pixels, wherein the scanning driving circuit, the at least one virtual pixel and the plurality of sub-pixels are positioned on one side of the substrate; the dummy pixels and the scanning drive circuit are both positioned in the non-display area; the sub-pixels are positioned in the display area, and the sub-pixels are arranged in an array;
the sub-pixel includes a pixel driving circuit and a light emitting element; the pixel driving circuit comprises a driving transistor and at least one first transistor; the driving transistor is used for providing driving current for the light-emitting element; the grid electrode of the first transistor is electrically connected with the scanning driving circuit; the first transistor is used for being switched on or switched off under the control of a scanning signal provided by the scanning driving circuit;
the dummy pixel includes a second transistor; the control end of the virtual pixel is electrically connected with the first reference signal end of the control circuit, the input end of the virtual pixel is electrically connected with the second reference signal end of the control circuit, and the output end of the virtual pixel is respectively electrically connected with the signal receiving end of the control circuit and the control end of the virtual pixel; the virtual pixel is used for respectively receiving a first reference signal and a second reference signal output by the control circuit, and outputting a threshold detection signal according to the first reference signal and the second reference signal, so that the control circuit outputs a control signal according to the threshold detection signal and controls the scanning drive circuit to provide a scanning signal; wherein, the threshold detection signal V1 ═ V2 | -Vth 1 |; v2 is the second reference signal, Vth1 is the threshold voltage of the second transistor;
wherein the display panel includes a plurality of virtual pixels; the plurality of virtual pixels are sequentially arranged along the column direction of the sub-pixels.
2. The display device according to claim 1, wherein the dummy pixel further comprises a first capacitance;
a first end of the first capacitor receives a fixed voltage signal, and a second end of the first capacitor is electrically connected with a grid electrode of the second transistor and a first electrode of the second transistor;
the gate of the second transistor is the control end of the dummy pixel, the first electrode of the second transistor is the output end of the dummy pixel, and the second electrode of the second transistor is the input end of the dummy pixel.
3. The display device according to claim 2, wherein the first electrode of the driving transistor is electrically connected to a first power supply;
the fixed voltage signal is a voltage signal of the first power supply.
4. The display device according to claim 1, wherein the second transistor is formed using the same material in the same process as the first transistor; and the size of the second transistor is the same as the size of the first transistor.
5. The display device according to claim 1, wherein the display panel further comprises a plurality of scanning signal lines and a plurality of data signal lines;
the first transistors of the sub-pixels in the same row are electrically connected with the scanning driving circuit through the same scanning signal line;
the first transistors of the sub-pixels in the same column are electrically connected to the same one of the data signal lines.
6. The display device according to claim 5, wherein the display panel further comprises a detection signal line; the output end of each virtual pixel is electrically connected with the signal receiving end of the control circuit through the detection signal line;
the detection signal line and the data signal line are both positioned on one side of the substrate base plate and are arranged on the same layer.
7. The display device according to claim 1, wherein the control circuit includes at least one signal conversion circuit and a driver chip;
a signal input pin of the driving chip is a signal receiving end of the control circuit; the driving chip is used for outputting a first level signal according to the threshold detection signal;
the control end of the signal conversion circuit is electrically connected with the first output pin of the driving chip, and the output end of the signal conversion circuit is electrically connected with the scanning driving circuit; the signal conversion circuit is used for receiving the first level signal and outputting a control signal to the scanning driving circuit according to the first level signal so that the scanning driving circuit provides a scanning signal according to the control signal.
8. The display device according to claim 7, wherein the signal conversion circuit comprises a switch module and a voltage division module;
the control end of the switch module is electrically connected with the first output pin of the driving chip; the first end of the switch module is electrically connected with the second output pin of the driving chip; the second output pin of the driving chip is used for outputting a second level signal; the switch module is used for generating a divided current according to the voltage difference between the first level signal and the second level signal;
the first end of the voltage division module is electrically connected with the third output pin of the driving chip, and the second end of the voltage division module and the second end of the switch module are electrically connected to a first node; the first node is an output end of the signal conversion circuit; the third output pin of the driving chip is used for outputting a third level signal; the voltage division module is used for dividing the voltage of the third level signal according to the divided current so as to enable the signal conversion circuit to output a control signal to the scanning driving circuit;
the voltage of the second level signal is different from the voltage of the third level signal, and the second level signal and the third level signal are both fixed voltage signals.
9. The display device according to claim 8, wherein the switch module includes a third transistor;
a gate of the third transistor is a control end of the switch module, a first electrode of the third transistor is a first end of the switch module, and a second electrode of the third transistor is a second end of the switch module;
or the first electrode of the third transistor is the control end of the switch module, the gate of the third transistor is the first end of the switch module, and the second electrode of the third transistor is the second end of the switch module.
10. The display device according to claim 9, wherein the third transistor and the second transistor are formed using the same material in the same process; and the size of the third transistor is the same as the size of the second transistor.
11. The display device according to claim 8, wherein the switch module includes a third transistor; the voltage division module comprises a voltage division resistor;
the display panel comprises a semiconductor layer positioned on one side of the substrate base plate; the semiconductor layer includes an active layer of the first transistor, an active layer of the second transistor, an active layer of the third transistor, and the voltage-dividing resistor;
the doping concentration of the voltage-dividing resistor is greater than that of the active layer of the third transistor.
12. The display device according to claim 11, wherein a length of a short side of the voltage division resistor is the same as a length of a short side of an active layer of the third transistor; the length of the long side of the voltage division resistor is n times of the length of the short side of the voltage division resistor; wherein n is more than or equal to 10 and less than or equal to 50.
13. The display device according to claim 8, wherein the control circuit further comprises a flexible circuit board;
the voltage division module comprises a voltage division resistor; the divider resistor is arranged in the flexible circuit board.
14. A control method for a display device, which is applied to the display device according to any one of claims 1 to 13, the control method comprising:
in a first stage, the control circuit outputs a first reference signal to the control end of the virtual pixel, and the control circuit outputs a second reference signal to the input end of the virtual pixel, so that the output end of the virtual pixel is the first reference signal;
in the second stage, the control circuit stops outputting the first reference signal to the control end of the virtual pixel, and the control circuit outputs the second reference signal to the input end of the virtual pixel until the output end of the virtual pixel is the threshold detection signal; wherein, the threshold detection signal V1 ═ V2 | -Vth 1 |; v2 is the second reference signal, Vth1 is the threshold voltage of the second transistor;
in a third stage, the threshold detection signal is output through the output end of the virtual pixel;
the output end of the virtual pixel is electrically connected with the control end of the virtual pixel; the display panel includes a plurality of virtual pixels; the plurality of virtual pixels are sequentially arranged along the column direction of the sub-pixels.
15. The control method according to claim 14, wherein the dummy pixel further includes a first capacitance; a first end of the first capacitor receives a fixed voltage signal, and a second end of the first capacitor is electrically connected with a grid electrode of the second transistor and a first electrode of the second transistor; a gate of the second transistor is a control end of the dummy pixel, a first electrode of the second transistor is an output end of the dummy pixel, and a second electrode of the second transistor is an input end of the dummy pixel;
the first stage specifically comprises: the first reference signal and the second reference signal output by the control circuit control the second transistor to be conducted and reset the second end of the first capacitor;
the second stage specifically comprises: the control circuit stops outputting a first reference signal, and a second reference signal output by the control circuit is written into the second end of the first capacitor through the conducted second transistor until the second end of the first capacitor is the threshold detection signal;
the third stage specifically includes: the second transistor is turned off, and the threshold detection signal is output through an output end of the dummy pixel.
16. An electronic device comprising the display device according to any one of claims 1 to 13.
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