CN110910833B - Display panel, brightness control method of display panel and electronic equipment - Google Patents

Display panel, brightness control method of display panel and electronic equipment Download PDF

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Publication number
CN110910833B
CN110910833B CN201911376559.3A CN201911376559A CN110910833B CN 110910833 B CN110910833 B CN 110910833B CN 201911376559 A CN201911376559 A CN 201911376559A CN 110910833 B CN110910833 B CN 110910833B
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voltage
power
display panel
time
display
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CN110910833A (en
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冷传利
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Wuhan Tianma Microelectronics Co Ltd
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Wuhan Tianma Microelectronics 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]
    • 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
    • G09G3/3258—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 voltage across 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]
    • G09G3/3275—Details of drivers for data electrodes
    • G09G3/3291—Details of drivers for data electrodes in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of El Displays (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

The application discloses a display panel, a brightness control method of the display panel and electronic equipment, wherein a plurality of display pixels and pixel circuits which correspond to the display pixels one by one and are connected with the display pixels are arranged in a display area of the display panel. At least one of the power voltage, the data voltage and the reference voltage received by the pixel circuit changes along with the power-on time of the display panel, so that the difference value between the brightness of the display panel and the power-on initial brightness of the display panel is smaller than a certain value (namely a preset threshold), the purpose of improving the stability of the display brightness of the display panel is achieved, the problem that the display brightness of the display panel changes along with the power-on time is avoided, and the problem that the difference between the actual display brightness of the display panel and the brightness set by a user is large is avoided.

Description

Display panel, brightness control method of display panel and electronic equipment
Technical Field
The present disclosure relates to the field of display technologies, and in particular, to a display panel, a brightness control method of the display panel, and an electronic device.
Background
As a new generation of display technology, an OLED (Organic Light-Emitting Diode) display panel has advantages of low power consumption, high color gamut, high brightness, high resolution, wide viewing angle, high response speed, and the like, and is therefore popular in the market.
In an OLED display panel, a pixel circuit generally includes a plurality of Thin Film Transistors (TFTs) and at least one capacitor, and in operation, the pixel circuit receives a data signal and a gate signal to control on/off and brightness of a display pixel connected to the pixel circuit.
In the actual application process, it is found that, under the condition that the display brightness set by the user is not changed, the display brightness of the OLED display panel is difficult to be kept unchanged at the set value, that is, the display brightness of the OLED display panel changes along with the change of the power-on time, so that the difference between the actual display brightness of the display panel and the display brightness set by the user is large, and adverse effects are brought to the use experience of the user.
Disclosure of Invention
In order to solve the technical problem, the application provides a display panel, a brightness control method of the display panel and an electronic device, so as to achieve the purpose of improving the stability of the display brightness of the display panel and avoid the problem that the display brightness of the display panel changes along with the power-on time, thereby avoiding the problem that the actual display brightness of the display panel is greatly different from the brightness set by a user.
In order to achieve the technical purpose, the embodiment of the application provides the following technical scheme:
a display panel for improving display brightness stability, comprising:
a substrate including a display area and a bezel area;
a plurality of display pixels arranged in an array on the display area;
pixel circuits corresponding to the display pixels one to one and connected to the display pixels;
the pixel circuit is used for controlling the display pixel to work according to the received power supply voltage, the data voltage and the reference voltage;
at least one of the power voltage, the data voltage and the reference voltage is changed along with the power-on time of the display panel, so that the difference value between the brightness of the display panel and the power-on initial brightness of the display panel is smaller than a preset threshold value;
the power supply voltage variation with the power-on time of the display panel includes: the amplitude of the power supply voltage is in positive correlation with the power-on time of the display panel;
the data voltage variation with the power-on time of the display panel includes: the amplitude of the data voltage is in a negative correlation with the power-on time of the display panel;
the reference voltage variation with the power-on time of the display panel comprises: the amplitude of the reference voltage is in positive correlation with the power-on time of the display panel.
A brightness control method of a display panel includes:
receiving a power supply voltage, a data voltage and a reference voltage;
controlling the display pixels to work according to the received power supply voltage, the data voltage and the reference voltage;
at least one of the power voltage, the data voltage and the reference voltage is changed along with the power-on time of the display panel, so that the difference value between the brightness of the display panel and the power-on initial brightness of the display panel is smaller than a preset threshold value;
the power supply voltage variation with the power-on time of the display panel includes: the amplitude of the power supply voltage is in positive correlation with the power-on time of the display panel;
the data voltage variation with the power-on time of the display panel includes: the amplitude of the data voltage is in a negative correlation with the power-on time of the display panel;
the reference voltage variation with the power-on time of the display panel comprises: the amplitude of the reference voltage is in positive correlation with the power-on time of the display panel.
An electronic device, comprising: a display panel as claimed in any one of the preceding claims.
It can be seen from the foregoing technical solutions that, the embodiments of the present application provide a display panel, a brightness control method of the display panel, and an electronic device, where a plurality of display pixels and pixel circuits that are in one-to-one correspondence with the display pixels and connected to the display pixels are disposed in a display area of the display panel. The inventor researches and discovers that the output current of the thin film transistor in the pixel circuit of the display panel can be attenuated to a certain degree along with the increase of the power-on time, the attenuation can cause the display brightness of the display panel to be reduced to a certain degree along with the increase of the power-on time, and through further research and discovery, the power supply voltage, the data voltage and the reference voltage received by the pixel circuit can affect the display brightness of the display pixel, and the power supply voltage and the reference voltage have positive correlation with the brightness of the display pixel, while the data voltage and the brightness of the display pixel have negative correlation, therefore, when at least one of the power supply voltage, the data voltage and the reference voltage is changed along with the power-on time of the display panel, the difference value of the brightness of the display panel and the power-on initial brightness of the display panel can be smaller than a certain value (namely the preset threshold), therefore, the purpose of improving the display brightness stability of the display panel is achieved, the problem that the display brightness of the display panel changes along with the power-on time is avoided, and the problem that the actual display brightness of the display panel is greatly different from the brightness set by a user is avoided.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic top view of a display panel according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a pixel circuit according to an embodiment of the present application;
fig. 3 is a graph of a power supply voltage versus an output current of a pixel circuit obtained through simulation according to an embodiment of the present application;
FIG. 4 is a graph of data voltage versus output current of a pixel circuit obtained by simulation according to an embodiment of the present application;
FIG. 5 is a graph of a reference voltage versus an output current of a pixel circuit obtained by simulation according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of a power supply circuit according to an embodiment of the present application;
fig. 7 is a schematic structural diagram of a power supply circuit according to another embodiment of the present application;
fig. 8 is a schematic structural diagram of a data driving circuit according to an embodiment of the present application;
fig. 9 is a schematic structural diagram of a voltage matrix unit according to an embodiment of the present application;
fig. 10 is a schematic structural diagram of a voltage matrix unit according to another embodiment of the present application;
fig. 11 is a schematic cross-sectional view illustrating a display panel according to an embodiment of the present disclosure;
fig. 12 is a flowchart illustrating a brightness control method for a display panel according to an embodiment of the present disclosure;
fig. 13 is an external view of an electronic device according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
An embodiment of the present application provides a display panel, as shown in fig. 1, fig. 1 is a schematic view of a top view structure of the display panel provided in the embodiment of the present application, where the display panel includes:
a substrate 100, the substrate 100 including a display area 110 and a bezel area 120;
a plurality of display pixels arranged in an array on the display area 110;
pixel circuits corresponding to the display pixels one to one and connected to the display pixels;
the pixel circuit is used for controlling the display pixel to work according to the received power supply voltage, the data voltage and the reference voltage;
at least one of the power voltage, the data voltage and the reference voltage is changed along with the power-on time of the display panel, so that the difference value between the brightness of the display panel and the power-on initial brightness of the display panel is smaller than a preset threshold value.
In fig. 1, reference numeral 115 denotes a pixel unit, the pixel unit 115 includes a display pixel and a pixel circuit corresponding thereto, and further, also shown in figure 1 are gate circuits located in the border region 120, a data driving circuit 113, a power supply circuit 116, and gate and data lines 112 and 111 located in the display region 110 in a crossed arrangement, the pixel unit 115 is disposed in an intersection defining area of the gate line 112 and the data line 111, the gate circuits include a first gate drive circuit 114A and a second gate drive circuit 114B, the first gate driving circuit 114A and the second gate driving circuit 114B are connected to the pixel circuit through the gate line 112, provide a gate voltage to the pixel circuit, the data driving circuit 113 is connected to the pixel circuit through the data line 111, and is configured to provide a data voltage to the pixel circuit; the power supply circuit 116 supplies a power supply voltage and a reference voltage to the pixel circuit through power supply lines (not shown in fig. 1).
In fig. 1, the gate driving method of the display panel is cross driving, and in other embodiments of the present application, the gate driving method of the display panel may also be single-side driving or double-side driving, which is not limited in the present application.
The pixel circuit generally includes a plurality of thin film transistors and at least one capacitor, and may be, for example, a 7T1C pixel circuit or a 2T1C pixel circuit. Referring to fig. 2, fig. 2 is a possible configuration of a 7T1C pixel circuit provided in an embodiment of the present application, where the 7T1C pixel circuit includes: a first transistor T1, a second transistor T2, a third transistor T3, a fourth transistor T4, a fifth transistor T5, a sixth transistor T6, a seventh transistor T7, and a first capacitor C1; wherein the content of the first and second substances,
a first terminal of the first transistor T1 is connected to one terminal of the first capacitor C1 for receiving a supply voltage; a second terminal of the first transistor T1 is connected to a first terminal of the second transistor T2 and a first terminal of a third transistor T3;
a second terminal of the second transistor T2 is for receiving a data voltage VDATA;
a second terminal of the third transistor T3 is connected to the first terminal of the fourth transistor T4 and the first terminal of the sixth transistor T6, and a control terminal of the third transistor T3 is connected to the first terminal of the fifth transistor T5, the second terminal of the fourth transistor T4, and a terminal of the first capacitor C1 away from the first transistor T1;
a second terminal of the fifth transistor T5 is connected to a second terminal of the seventh transistor T7 for receiving a reference voltage VREF, and a first terminal of the seventh transistor T7 is connected to a second terminal of the sixth transistor T6 and an anode of the display pixel D1;
the control ends of the first transistor T1, the second transistor T2, the fourth transistor T4, the sixth transistor T6, the seventh transistor T7 and the fifth transistor T5 are all used for receiving a gate voltage;
in fig. 2, the first transistor T1, the second transistor T2, the third transistor T3, the fourth transistor T4, the fifth transistor T5, the sixth transistor T6 and the seventh transistor T7 are P-type transistors, and it is found through simulation of the 7T1C pixel circuit shown in fig. 2 that:
when the pixel circuit is a 7T1C pixel circuit, and the transistors in the 7T1C pixel circuit are all P-type transistors, in order to achieve the purpose that the difference between the brightness of the display panel and the power-on initial brightness of the display panel is smaller than a preset threshold, the variation relationship of at least one of the power supply voltage, the data voltage and the reference voltage along with the power-on time of the display panel may be as follows:
the power supply voltage variation with the power-on time of the display panel includes: the amplitude of the power supply voltage is in positive correlation with the power-on time of the display panel;
the data voltage variation with the power-on time of the display panel includes: the amplitude of the data voltage is in a negative correlation with the power-on time of the display panel;
the reference voltage variation with the power-on time of the display panel comprises: the amplitude of the reference voltage is in positive correlation with the power-on time of the display panel.
In the case where the pixel circuit is a 7T1C pixel circuit, and the transistors in the 7T1C pixel circuit are all N-type transistors, in order to achieve the purpose that the difference between the brightness of the display panel and the power-on initial brightness of the display panel is smaller than a preset threshold, the variation relationship of at least one of the power supply voltage, the data voltage and the reference voltage with the power-on time of the display panel may be opposite to that when the transistors in the 7T1C pixel circuit are all P-type transistors, that is:
the power supply voltage variation with the power-on time of the display panel includes: the amplitude of the power supply voltage is in a negative correlation with the power-on time of the display panel;
the data voltage variation with the power-on time of the display panel includes: the amplitude of the data voltage is in positive correlation with the power-on time of the display panel;
the reference voltage variation with the power-on time of the display panel comprises: the amplitude of the reference voltage is in a negative correlation with the power-on time of the display panel.
In fig. 2, PVDD represents a positive voltage of the power supply, PVEE represents a negative voltage of the power supply, and the magnitude of the power supply voltage is determined by the values of PVDD and PVEE.
The inventor researches and discovers that after the display panel is powered on, particularly within one hour after the display panel is powered on, for the pixel circuit composed of a plurality of thin film transistors and at least one capacitor shown in fig. 2, the current output to the display pixel by the pixel circuit is attenuated due to the attenuation characteristics of the thin film transistors, so that the brightness of the display pixel is reduced by about 4% within one hour, and the brightness attenuation has a significant adverse effect on the service life of the display pixel.
The inventor finds through further research that the magnitudes of the power voltage, the data voltage VDATA and the reference voltage VREF received by the pixel circuit are all related to the output current of the pixel circuit, and further related to the luminance of the display pixel, that is, related to the overall display luminance of the display panel, and particularly, referring to fig. 3, fig. 3 is a relationship curve of the power voltage and the output current of the pixel circuit obtained through simulation, the abscissa in fig. 3 represents the magnitude of the power voltage, and the ordinate represents the output current value of the pixel circuit, and it can be seen from fig. 3 that the power voltage and the output current of the pixel circuit have a positive correlation, that is, as the power voltage increases, the output current of the pixel circuit increases, the luminance of the display pixel increases accordingly, and the luminance of the display panel increases accordingly; therefore, if the relationship of the magnitude of the power supply voltage and the power-on time is set to a positive correlation, it is possible to cancel out the luminance drop due to the attenuation of the thin film transistor to some extent.
Referring to fig. 4, fig. 4 is a graph of a relationship between a data voltage VDATA and an output current of a pixel circuit obtained through simulation, an abscissa in fig. 4 represents a magnitude of the data voltage VDATA, and an ordinate represents an output current value of the pixel circuit, and it can be seen from fig. 4 that the data voltage VDATA and the output current of the pixel circuit have a negative correlation, that is, as the magnitude of the data voltage VDATA decreases, the output current of the pixel circuit increases, the luminance of a display pixel increases, and the luminance of a display panel increases; therefore, if the relationship of the magnitude of the data voltage VDATA with the power-on time is set to be a negative correlation relationship, the luminance drop due to the attenuation of the thin film transistor can be cancelled to some extent.
Referring to fig. 5, fig. 5 is a relationship curve of a reference voltage VREF and an output current of a pixel circuit obtained through simulation, an abscissa in fig. 5 represents a magnitude of the reference voltage VREF, and an ordinate represents an output current value of the pixel circuit, and it can be seen from fig. 5 that the magnitude of the reference voltage VREF and the output current of the pixel circuit have a positive correlation, that is, as the reference voltage VREF increases, the output current of the pixel circuit also increases, the luminance of a display pixel increases accordingly, and the luminance of a display panel also increases accordingly; therefore, if the relationship of the magnitude of the reference voltage VREF and the power-on time is set to a positive correlation, it is possible to cancel out the luminance drop due to the attenuation of the thin film transistor to some extent.
By analyzing the simulation curves of fig. 3-5, it can be derived that: in order to compensate for brightness attenuation of the display panel caused by attenuation of the thin film transistor in the pixel circuit after power-on, the brightness attenuation problem of the display panel caused by attenuation of the thin film transistor can be eliminated or improved by adjusting the relationship between the amplitude of the power supply voltage, the data voltage VDATA and/or the reference voltage VREF and the power-on time.
Therefore, in the embodiment of the present application, at least one of the power voltage, the data voltage VDATA, and the reference voltage VREF is changed along with the power-on time of the display panel, that is, the difference between the brightness of the display panel and the power-on initial brightness of the display panel is smaller than a certain value (i.e., the preset threshold), so as to achieve the purpose of improving the stability of the display brightness of the display panel, avoid the problem that the display brightness of the display panel changes along with the power-on time, and avoid the problem that the actual display brightness of the display panel is greatly different from the brightness set by the user.
The value of the preset threshold value can be 0cd/m2、2cd/m2、5cd/m2、10cd/m2And the smaller luminance value.
The power-on initial brightness of the display panel refers to a stable brightness value of the display panel within a certain time after power-on, for example, the brightness value may be a brightness value of 10s-60s after power-on, and it may be considered that the thin film transistor has not been attenuated or the influence of attenuation on the brightness of the display panel may be negligible in the time period.
It should be noted that theoretically, any one of the power voltage, the data voltage VDATA and the reference voltage VREF varies with the power-on time of the display panel according to the above relationship, so that the problem of brightness reduction caused by the attenuation of the thin film transistor can be eliminated or improved. However, in some specific designs, it may be that all of the power voltage, the data voltage VDATA, and the reference voltage VREF change with the power-on time, or any two of the power voltage, the data voltage VDATA, and the reference voltage VREF change with the power-on time, so as to achieve the purpose of eliminating or improving the brightness reduction problem caused by the attenuation of the thin film transistor.
On the basis of the foregoing embodiments, in an embodiment of the present application, referring to fig. 6, fig. 6 is a schematic diagram of a possible structure of a power supply circuit 116 provided in an embodiment of the present application, where the power supply circuit 116 includes: a first parameter control unit 116A, a first amplification control unit 116B, a second parameter control unit 116C, and a second amplification control unit 116D;
when the power supply voltage changes along with the power-on time of the display panel, the first parameter control unit 116A is configured to obtain the power-on time of the display panel and a corresponding relationship between the amplitude of the power supply voltage and the power-on time, determine a corresponding relationship between an output parameter of the first amplification control unit 116B and the power-on time according to the corresponding relationship between the amplitude of the power supply voltage and the power-on time and the structural parameter of the first amplification control unit 116B, and control the output parameter of the first amplification control unit 116B according to the power-on time and the corresponding relationship between the output parameter of the first amplification control unit 116B and the power-on time, so that the amplitude of the power supply voltage changes along with the power-on time of the display panel; specifically, when the pixel circuit is a 7T1C pixel circuit, and the transistors in the 7T1C pixel circuit are all P-type transistors, the variation of the amplitude of the power supply voltage with the power-on time of the display panel is specifically: the amplitude of the power supply voltage is in positive correlation with the power-on time of the display panel.
When the reference voltage changes with the power-on time of the display panel, the second parameter control unit 116C is configured to obtain the power-on time of the display panel and a corresponding relationship between the amplitude of the reference voltage and the power-on time, determine a corresponding relationship between the output parameter of the second amplification control unit 116D and the power-on time according to the corresponding relationship between the amplitude of the reference voltage and the power-on time and the structural parameter of the second amplification control unit 116D, and control the output parameter of the second amplification control unit 116D according to the power-on time and the corresponding relationship between the output parameter of the second amplification control unit 116D and the power-on time, so that the amplitude of the reference voltage changes with the power-on time of the display panel. Specifically, when the pixel circuit is a 7T1C pixel circuit, and the transistors in the 7T1C pixel circuit are all P-type transistors, the amplitude of the reference voltage varies with the power-on time of the display panel specifically as follows: the amplitude of the reference voltage is in positive correlation with the power-on time of the display panel.
In the present embodiment, the first parameter control unit 116A and the first amplification control unit 116B in the power supply circuit 116 are configured to output a power supply voltage, and the second parameter control unit 116C and the second amplification control unit 116D are configured to output a reference voltage.
The operation mode of the first parameter control unit 116A may be controlled by inputting a first enable signal of different states to the first parameter control unit 116A, for example, when the first enable signal is at a high level, the first parameter control unit 116A obtains a correspondence relationship between a power-on time and a magnitude of the power supply voltage and the power-on time, determining the corresponding relation between the output parameter of the first amplification control unit 116B and the power-on time according to the corresponding relation between the amplitude of the power supply voltage and the power-on time and the structural parameter of the first amplification control unit 116B, controlling the output parameter of the first amplification control unit 116B according to the power-on time and the corresponding relationship between the output parameter of the first amplification control unit 116B and the power-on time, so that the amplitude of the power voltage changes with the power-on time of the display panel;
when the first enable signal is at a low level, the first parameter control unit 116A controls the first amplification control unit 116B to output a power voltage that does not change with the power-on time, and since the way in which the first parameter control unit 116A controls the first amplification control unit 116B to output the power voltage that does not change with the power-on time is well known to those skilled in the art, the details of the present application are omitted here.
Similarly, the operation mode of the second parameter control unit 116C may be controlled by inputting a second enable signal with different states to the second parameter control unit 116C, for example, when the second enable signal is at a high level, the second parameter control unit 116C obtains a power-on time of the display panel and a corresponding relationship between a magnitude of the reference voltage and the power-on time, determines a corresponding relationship between an output parameter of the second amplification control unit 116D and the power-on time according to the corresponding relationship between the magnitude of the reference voltage and the power-on time and a structural parameter of the second amplification control unit 116D, and controls the output parameter of the second amplification control unit 116D according to the power-on time and the corresponding relationship between the output parameter of the second amplification control unit 116D and the power-on time, so that the amplitude of the reference voltage is changed along with the power-on time of the display panel;
when the second enable signal is at a low level, the second parameter control unit 116C controls the second amplification control unit 116D to output a reference voltage that does not change with the power-on time, and since the way in which the second parameter control unit 116C controls the second amplification control unit 116D to output the reference voltage that does not change with the power-on time is well known to those skilled in the art, the details of the present application are not repeated herein.
As for the first amplification control unit and the second amplification control unit, they are generally composed of a charge pump and a power transistor, that is, referring to fig. 7, fig. 7 is a schematic diagram of a possible structure of a power supply circuit provided in the embodiment of the present application, in the circuit shown in fig. 7, the first amplification control unit 116B includes a first charge pump 116B1 and a first power transistor 116B 2;
the output parameter of the first amplification control unit 116B includes at least one of a switching frequency of the first charge pump 116B1, a voltage amplification factor of the first charge pump 116B1, and a gate voltage of the first power transistor 116B 2.
The second amplification control unit 116D includes a second charge pump 116D1 and a second power transistor 116D 2;
the output parameter of the second amplification control unit 116D includes at least one of a switching frequency of the second charge pump 116D1, a voltage amplification factor of the second charge pump 116D1, and a gate voltage of the second power transistor 116D 2.
The first charge pump 116B1 and the second charge pump 116D1 may be switched capacitor charge pumps or switched inductor charge pumps, with the first charge pump 116B1 and the second charge pump 116D1 being present as voltage boost circuits in the power supply circuit.
The first power transistor 116B2 and the second power transistor 116D2 are normally operated in a linear region, and the magnitude of the output current of the transistors can be controlled by controlling the gate voltage input to the transistors.
Accordingly, for the first amplification control unit 116B, the purpose of adjusting the magnitude of the power supply voltage output by the first amplification control unit 116B can be achieved by adjusting at least one of the switching frequency of the first charge pump 116B1, the voltage amplification factor of the first charge pump 116B1, and the gate voltage of the first power transistor 116B 2.
For the second amplification control unit 116D, the purpose of adjusting the magnitude of the power supply voltage output by the second amplification control unit 116D can be achieved by adjusting at least one of the switching frequency of the second charge pump 116D1, the voltage amplification factor of the second charge pump 116D1, and the gate voltage of the second power transistor 116D 2.
Referring to fig. 8, with respect to a data driving circuit, fig. 8 is a schematic structural diagram of a data driving circuit 113 according to an embodiment of the present application, where the data driving circuit 113 includes: a parameter writing unit 113A, a voltage register 113B, and a voltage matrix unit 113C;
the voltage matrix unit 113C is configured to generate a voltage matrix according to a first voltage and a second voltage which are input, where the voltage matrix includes a plurality of voltages to be output with different amplitudes, the voltage to be output is positively correlated with a value obtained by subtracting the second voltage from the first voltage, and the data voltage is determined from the voltage matrix according to a display signal of the display panel and is transmitted to the display pixel;
the parameter writing unit 113A is configured to obtain a power-on time of the display panel and a corresponding relationship between the data voltage and the power-on time, determine a corresponding relationship between a first voltage and the power-on time and a corresponding relationship between a second voltage and the power-on time according to the corresponding relationship between the data voltage and the power-on time and a structural parameter of the voltage matrix unit 113C, and write voltage address information into the voltage register 113B according to the corresponding relationship between the first voltage and the power-on time and the corresponding relationship between the second voltage and the power-on time;
the voltage register 113B is configured to determine the amplitudes of the first voltage and the second voltage according to the voltage address information and provide the determined amplitudes of the first voltage and the second voltage to the voltage matrix unit 113C, so that the amplitudes of the data voltages are changed along with the power-on time of the display panel. Specifically, when the pixel circuit is a 7T1C pixel circuit, and the transistors in the 7T1C pixel circuit are all P-type transistors, the amplitude of the data voltage varies with the power-on time of the display panel specifically as follows: the magnitude of the data voltage is in a negative correlation with the power-on time of the display panel.
In this embodiment, the data voltage is determined from the voltage matrix according to address information of the voltage to be output.
When the data driving circuit needs to output the data voltage changing along with the power-on time, a voltage matrix is generated through a voltage matrix unit according to the input first voltage and the input second voltage; and writing voltage address information into the voltage register according to the corresponding relation between the first voltage and the power-on time and the corresponding relation between the second voltage and the power-on time, so that the voltage register determines the amplitudes of the first voltage and the second voltage according to the voltage address information and supplies the amplitudes to the voltage matrix unit to realize the purpose of changing the amplitudes of the first voltage and the second voltage, so that the amplitudes of the voltages to be output in the voltage matrix form a negative correlation with the power-on time, and further the amplitude of the data voltage determined from the voltage matrix forms a negative correlation with the power-on time of the display panel.
Of course, the data driving circuit provided in the embodiment of the present application may also provide a data voltage that does not change with the power-on time, that is, the data voltage is determined from the voltage matrix only according to the address information of the voltage to be output, and each voltage to be output in the voltage matrix does not change with the power-on time. Since the process of outputting the data voltage that does not change with the power-on time by the data driving circuit is well known to those skilled in the art, the detailed description of the present application is omitted here.
Alternatively, referring to fig. 9, fig. 9 is a schematic structural diagram of a voltage matrix unit provided in an embodiment of the present application, where the voltage matrix unit includes a voltage dividing unit 113C1 and a switch matrix 113C 2;
the voltage dividing unit 113C1 is configured to generate a voltage matrix according to the input first voltage and second voltage, where the voltage matrix includes a plurality of to-be-output voltages with different amplitudes, and the to-be-output voltage is positively correlated to a value obtained by subtracting the second voltage from the first voltage;
the switch matrix 113C2 is connected to the output terminal of the voltage divider 113C1, and is used for determining the data voltage from the voltage matrix according to the display signal of the display panel and transmitting the data voltage to the display pixel;
the structural parameters of the voltage matrix unit are the structural parameters of the voltage dividing unit.
Referring to fig. 10, fig. 10 is a schematic structural diagram of a voltage dividing unit 113C according to an embodiment of the present disclosure, where the voltage dividing unit 113C includes N first resistors R1 connected in series, the N first resistors R1 connected in series include N-1 connection nodes located between adjacent first resistors R1, and N is an integer greater than 2;
the output end of the voltage division unit 113C is a part or all of the N-1 connection nodes;
the structural parameters of the voltage dividing unit 113C are the relationship between the output end of the voltage dividing unit 113C and the N-1 connection nodes and the resistance relationship between the N first resistors R1.
In fig. 10, V1 represents the first voltage, V2 represents the second voltage,
on the basis of the above embodiment, in another embodiment of the present application, when the power-on time of the display panel is less than a preset time threshold, at least one of the power supply voltage, the data voltage and the reference voltage varies with the power-on time of the display panel;
when the power-on time of the display panel is greater than or equal to a preset time threshold, the power voltage is kept unchanged when the power-on time is equal to the preset time threshold;
the data voltage is kept unchanged when the power-on time is equal to a preset time threshold;
and the reference voltage is kept unchanged when the power-on time is equal to a preset time threshold value.
As described above, in the previous hour of the power-up of the display panel, the attenuation of the thin film transistor in the pixel circuit is more significant, after one hour of powering up the display panel, the attenuation effect of the thin film transistors in the pixel circuits is greatly reduced, the effect on the brightness of the display panel is also greatly reduced, and therefore, in this embodiment, when the power-on time of the display panel is less than a certain value (the preset time threshold), at least one of the power supply voltage, the data voltage and the reference voltage varies with a power-on time of the display panel to eliminate brightness degradation of the display panel due to degradation of the thin film transistor, when the power-on time is greater than the preset time threshold, the attenuation of the thin film transistor is considered to have small influence on the brightness of the display panel, and at the moment, the power supply voltage can be kept unchanged when the power-on time is equal to the preset time threshold; the data voltage is kept unchanged when the power-on time is equal to a preset time threshold; and the reference voltage is kept unchanged when the power-on time is equal to a preset time threshold value, so that the operation amount of the data driving circuit and the power supply circuit is reduced, and the reduction of the power consumption of the data driving circuit and the power supply circuit is facilitated.
Optionally, referring to fig. 11, fig. 11 is a schematic cross-sectional structure diagram of the display panel, where the display panel further includes:
an encapsulation layer 200 covering the display area and the frame area;
a cover plate 300 on a side of the encapsulation layer 200 facing away from the substrate.
For the OLED display panel, after the structures such as each pixel circuit and display pixel on the substrate are prepared, the structures on the substrate 100 can be encapsulated by preparing an encapsulation layer, and the encapsulation layer can be protected by providing the cover plate 300.
Correspondingly, an embodiment of the present application further provides a brightness control method for a display panel, as shown in fig. 12, fig. 12 is a schematic flow chart of the brightness control method for a display panel provided in the embodiment of the present application, where the brightness control method for a display panel includes:
s101: receiving a power supply voltage, a data voltage and a reference voltage;
s102: controlling the display pixels to work according to the received power supply voltage, the data voltage and the reference voltage;
at least one of the power voltage, the data voltage and the reference voltage is changed along with the power-on time of the display panel, so that the difference value between the brightness of the display panel and the power-on initial brightness of the display panel is smaller than a preset threshold value;
as described above, when the pixel circuit is a 7T1C pixel circuit, and the transistors in the 7T1C pixel circuit are all P-type transistors, in order to achieve the purpose that the difference between the brightness of the display panel and the power-on initial brightness of the display panel is smaller than the preset threshold, the variation relationship of at least one of the power supply voltage, the data voltage and the reference voltage with the power-on time of the display panel may be as follows:
the power supply voltage variation with the power-on time of the display panel includes: the amplitude of the power supply voltage is in positive correlation with the power-on time of the display panel;
the data voltage variation with the power-on time of the display panel includes: the amplitude of the data voltage is in a negative correlation with the power-on time of the display panel;
the reference voltage variation with the power-on time of the display panel comprises: the amplitude of the reference voltage is in positive correlation with the power-on time of the display panel.
As described above, for the pixel circuit composed of a plurality of thin film transistors and at least one capacitor shown in fig. 2, after the display panel is powered on, especially within one hour after the display panel is powered on, the current output from the pixel circuit to the display pixel may be attenuated due to the attenuation characteristics of the thin film transistors, so that the brightness of the display pixel may be reduced by about 4% within one hour, and the brightness attenuation has a significant adverse effect on the lifetime of the display pixel.
The inventor finds through further research that the magnitudes of the power supply voltage, the data voltage and the reference voltage received by the pixel circuit are all related to the output current of the pixel circuit, and further related to the luminance of the display pixel, that is, related to the overall display luminance of the display panel, and particularly, referring to fig. 3, fig. 3 is a relationship curve of the power supply voltage and the output current of the pixel circuit obtained through simulation, the abscissa in fig. 3 represents the magnitude of the power supply voltage, and the ordinate represents the output current value of the pixel circuit, and it can be seen from fig. 3 that the power supply voltage and the output current of the pixel circuit have a positive relationship, that is, as the power supply voltage increases, the output current of the pixel circuit also increases, the luminance of the display pixel also increases, and the luminance of the display panel also increases; therefore, if the relationship of the magnitude of the power supply voltage and the power-on time is set to a positive correlation, it is possible to cancel out the luminance drop due to the attenuation of the thin film transistor to some extent.
Therefore, in the embodiment of the present application, at least one of the power voltage, the data voltage, and the reference voltage is changed along with the power-on time of the display panel, that is, a difference between the brightness of the display panel and the power-on initial brightness of the display panel is smaller than a certain value (that is, the preset threshold), so that the purpose of improving the stability of the display brightness of the display panel is achieved, the problem that the display brightness of the display panel changes along with the power-on time is avoided, and the problem that the difference between the actual display brightness of the display panel and the brightness set by the user is large is avoided.
Correspondingly, an electronic device is further provided in the embodiments of the present application, as shown in fig. 13, the electronic device 400 includes the display panel according to any of the embodiments.
To sum up, the embodiment of the application provides a display panel, a brightness control method of the display panel and an electronic device, wherein a plurality of display pixels and pixel circuits which are in one-to-one correspondence with the display pixels and connected with the display pixels are arranged in a display area of the display panel. The inventor researches and discovers that the output current of the thin film transistor in the pixel circuit of the display panel can be attenuated to a certain degree along with the increase of the power-on time, the attenuation can cause the display brightness of the display panel to be reduced to a certain degree along with the increase of the power-on time, and through further research and discovery, the power supply voltage, the data voltage and the reference voltage received by the pixel circuit can affect the display brightness of the display pixel, and the power supply voltage and the reference voltage have positive correlation with the brightness of the display pixel, while the data voltage and the brightness of the display pixel have negative correlation, therefore, when at least one of the power supply voltage, the data voltage and the reference voltage is changed along with the power-on time of the display panel, the difference value of the brightness of the display panel and the power-on initial brightness of the display panel can be smaller than a certain value (namely the preset threshold), therefore, the purpose of improving the display brightness stability of the display panel is achieved, the problem that the display brightness of the display panel changes along with the power-on time is avoided, and the problem that the actual display brightness of the display panel is greatly different from the brightness set by a user is avoided.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (11)

1. A display panel, comprising:
a substrate including a display area and a bezel area;
a plurality of display pixels arranged in an array on the display area;
pixel circuits corresponding to the display pixels one to one and connected to the display pixels;
the pixel circuit is used for controlling the display pixel to work according to the received power supply voltage, the data voltage and the reference voltage;
at least one of the power voltage, the data voltage and the reference voltage is changed along with the power-on time of the display panel, so that the difference value between the brightness of the display panel and the power-on initial brightness of the display panel is smaller than a preset threshold value;
further comprising: the data driving circuit and the power circuit are positioned in the frame area; wherein the content of the first and second substances,
the data driving circuit is used for providing data voltage for the pixel circuit;
the power supply circuit is used for providing power supply voltage and reference voltage for the pixel circuit;
when the data voltage varies with the power-on time of the display panel, the data driving circuit includes: the device comprises a parameter writing unit, a voltage register and a voltage matrix unit;
the voltage matrix unit is used for generating a voltage matrix according to a first voltage and a second voltage which are input, wherein the voltage matrix comprises a plurality of voltages to be output with different amplitudes, the voltage to be output is positively correlated with a value obtained by subtracting the second voltage from the first voltage, and the data voltage is determined from the voltage matrix according to a display signal of the display panel and is transmitted to the display pixel;
the parameter writing unit is used for acquiring the power-on time of the display panel and the corresponding relation between the data voltage and the power-on time, determining the corresponding relation between a first voltage and the power-on time and the corresponding relation between a second voltage and the power-on time according to the corresponding relation between the data voltage and the power-on time and the structural parameters of the voltage matrix unit, and writing voltage address information into the voltage register according to the corresponding relation between the first voltage and the power-on time and the corresponding relation between the second voltage and the power-on time;
and the voltage register is used for determining the amplitudes of the first voltage and the second voltage according to the voltage address information and providing the amplitudes of the first voltage and the second voltage to the voltage matrix unit so as to enable the amplitudes of the data voltages to change along with the power-on time of the display panel.
2. The display panel according to claim 1, wherein the power supply circuit comprises: the device comprises a first parameter control unit, a first amplification control unit, a second parameter control unit and a second amplification control unit;
when the power supply voltage changes along with the power-on time of the display panel, the first parameter control unit is configured to obtain the power-on time of the display panel and a corresponding relationship between the amplitude of the power supply voltage and the power-on time, determine a corresponding relationship between an output parameter of the first amplification control unit and the power-on time according to the corresponding relationship between the amplitude of the power supply voltage and the power-on time and a structural parameter of the first amplification control unit, and control the output parameter of the first amplification control unit according to the power-on time and the corresponding relationship between the output parameter of the first amplification control unit and the power-on time, so that the amplitude of the power supply voltage changes along with the power-on time of the display panel;
when the reference voltage changes along with the power-on time of the display panel, the second parameter control unit is configured to obtain the power-on time of the display panel and a corresponding relationship between the amplitude of the reference voltage and the power-on time, determine a corresponding relationship between an output parameter of the second amplification control unit and the power-on time according to the corresponding relationship between the amplitude of the reference voltage and the power-on time and a structural parameter of the second amplification control unit, and control the output parameter of the second amplification control unit according to the power-on time and the corresponding relationship between the output parameter of the second amplification control unit and the power-on time, so that the amplitude of the reference voltage changes along with the power-on time of the display panel.
3. The display panel according to claim 2, wherein the first amplification control unit includes a first charge pump and a first power transistor;
the output parameter of the first amplification control unit comprises at least one of a switching frequency of the first charge pump, a voltage amplification factor of the first charge pump, and a gate voltage of the first power transistor.
4. The display panel according to claim 2, wherein the second amplification control unit includes a second charge pump and a second power transistor;
the output parameter of the second amplification control unit comprises at least one of a switching frequency of the second charge pump, a voltage amplification factor of the second charge pump, and a gate voltage of the second power transistor.
5. The display panel according to claim 1, wherein the voltage matrix unit comprises a voltage dividing unit and a switch matrix;
the voltage dividing unit is used for generating a voltage matrix according to a first voltage and a second voltage which are input, wherein the voltage matrix comprises a plurality of voltages to be output with different amplitudes, and the voltage to be output is positively correlated with a value obtained by subtracting the second voltage from the first voltage;
the switch matrix is connected with the output end of the voltage division unit and used for determining the data voltage from the voltage matrix according to a display signal of a display panel and transmitting the data voltage to the display pixel;
the structural parameters of the voltage matrix unit are the structural parameters of the voltage dividing unit.
6. The display panel according to claim 5, wherein the voltage dividing unit comprises N first resistors connected in series in sequence, the N first resistors connected in series in sequence comprise N-1 connecting nodes between adjacent first resistors, and N is an integer greater than 2;
the output end of the voltage division unit is part or all of N-1 connection nodes;
the structural parameters of the voltage dividing unit are the relationship between the output end of the voltage dividing unit and the N-1 connecting nodes and the resistance value relationship between the N first resistors.
7. The display panel according to claim 1, further comprising: a plurality of gate lines and a plurality of data lines arranged in the display area in a crossed manner, and a gate circuit arranged in the frame area;
the intersection of the gate line and the data line defines an area for arranging the display pixel and the pixel circuit;
the gate line is connected to the gate circuit and the pixel circuit, and the data line is connected to the data driving circuit and the pixel circuit.
8. The display panel according to claim 1, wherein at least one of the power supply voltage, the data voltage, and the reference voltage varies with a power-on time of the display panel when the power-on time of the display panel is less than a preset time threshold;
when the power-on time of the display panel is greater than or equal to a preset time threshold, the power voltage is kept unchanged when the power-on time is equal to the preset time threshold;
the data voltage is kept unchanged when the power-on time is equal to a preset time threshold;
and the reference voltage is kept unchanged when the power-on time is equal to a preset time threshold value.
9. The display panel according to claim 1, further comprising:
an encapsulation layer covering the display area and the frame area;
and the cover plate is positioned on one side of the packaging layer, which faces away from the substrate.
10. A method for controlling brightness of a display panel, comprising:
receiving a power supply voltage, a data voltage and a reference voltage;
controlling the display pixels to work according to the received power supply voltage, the data voltage and the reference voltage;
at least one of the power voltage, the data voltage and the reference voltage is changed along with the power-on time of the display panel, so that the difference value between the brightness of the display panel and the power-on initial brightness of the display panel is smaller than a preset threshold value.
11. An electronic device, comprising: the display panel of any one of claims 1-9.
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