CN112289263A - Pixel compensation method, pixel compensation device and display device - Google Patents

Pixel compensation method, pixel compensation device and display device Download PDF

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Publication number
CN112289263A
CN112289263A CN202011282334.4A CN202011282334A CN112289263A CN 112289263 A CN112289263 A CN 112289263A CN 202011282334 A CN202011282334 A CN 202011282334A CN 112289263 A CN112289263 A CN 112289263A
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pixel
sub
driving voltage
gray scale
value
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CN112289263B (en
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刘敏
韩立静
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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
    • G09G3/20—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
    • G09G3/2007—Display of intermediate tones
    • G09G3/2074—Display of intermediate tones using sub-pixels
    • 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]
    • G09G3/3225—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
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping

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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 Indicators Other Than Cathode Ray Tubes (AREA)
  • Electroluminescent Light Sources (AREA)

Abstract

The embodiment of the invention provides a pixel compensation method, a pixel compensation device and a display device, and solves the technical problem that a display panel is prone to color cast or screen burn in the prior art. According to the pixel compensation method provided by the embodiment of the invention, the pixels are compensated according to the drive current attenuation rate of each sub-pixel under the first preset gray scale, so that the drive current difference between the sub-pixels is smaller no matter how long the display panel is used in the use process, and the probability of color cast or screen burn of the display panel is reduced; in addition, when the second sub-pixels are in different gray scales, the voltage difference values of the second sub-pixels between two adjacent gray scales are adjusted in equal proportion, so that after at least part of the second sub-pixels are subjected to voltage compensation, the gamma curve of the display panel is not shifted, and the display quality of the display panel is improved.

Description

Pixel compensation method, pixel compensation device and display device
[ technical field ] A method for producing a semiconductor device
The present invention relates to the field of display technologies, and in particular, to a pixel compensation method, a pixel compensation device, and a display device.
[ background of the invention ]
With the development of display technology, the variety of displays is increasing, and Organic Light-Emitting Diode (OLED) displays have the advantages of low power consumption, fast refresh rate, Light and thin screen body, no need of backlight source, and the like as active Light-Emitting display products. The luminous material of the OLED display is an organic luminous material, and due to the technical limitation of the current organic luminous material, the longer the service life of the OLED device is, the larger the attenuation proportion of the luminous brightness of the OLED device is, especially in the area for displaying the fixed icon, the more serious the luminous brightness attenuation of the OLED device is than that of other areas, so that the problem that the display panel has image sticking (also called burn-in or burning) is caused; in addition, since the OLED display includes three primary colors of red, blue and green, but due to the limitation of the organic light emitting materials, the decay periods of the light emitting materials of the three primary colors of blue, red and green are not the same, and after a period of time, the light emitting luminance of the light emitting devices of blue, red and green decay to different degrees, thereby causing the color cast of the display panel.
[ summary of the invention ]
In view of this, embodiments of the present invention provide a pixel compensation method, a pixel compensation device, and a display device, which solve the technical problems of color cast and screen burn-in of a display panel in the prior art after a period of use.
As an aspect of the present invention, an embodiment of the present invention provides a pixel compensation method, including:
acquiring the current driving current of each sub-pixel in the display panel under a first preset gray scale;
calculating the driving current attenuation rate of each sub-pixel according to the initial driving voltage of each sub-pixel under the first preset gray scale and the current driving current;
identifying the driving current attenuation rate with the largest value from the driving current attenuation rates of each sub-pixel, wherein the sub-pixel corresponding to the driving current attenuation rate with the largest value is a first sub-pixel, and the rest of sub-pixels in the display panel are all second sub-pixels;
determining a compensated driving voltage difference value between the compensated maximum driving voltage and the minimum driving voltage of the second sub-pixel according to the driving current attenuation rate of the first sub-pixel, the driving current attenuation rate of the second sub-pixel, and an initial driving voltage difference value between the maximum initial driving voltage and the minimum initial driving voltage of the second sub-pixel;
determining a compensated driving voltage stepping value according to the compensated driving voltage difference value of the second sub-pixels, and calculating an incremental voltage value of each second sub-pixel according to the compensated driving voltage stepping value and the gray scale stepping number under a first preset gray scale, wherein the incremental voltage value is a voltage value of the driving voltage under the first preset gray scale increased relative to the driving voltage under a second preset gray scale, and the difference between the first preset gray scale and the second preset gray scale is a gray scale;
and calculating the driving voltage of the second sub-pixel under the first preset gray scale according to the driving voltage of the second sub-pixel under the second preset gray scale and the incremental voltage value.
As a second aspect of the present invention, an embodiment of the present invention provides a pixel compensation device, including:
the pixel current detection circuit is used for acquiring the current driving current of each sub-pixel in the display panel under a first preset gray scale;
the calculating module is used for calculating the driving current attenuation rate of each sub-pixel according to the initial driving voltage of each sub-pixel under the first preset gray scale and the current driving current;
the identification module is configured to identify the driving current attenuation rate with the largest value from the driving current attenuation rates of each sub-pixel, where the sub-pixel corresponding to the driving current attenuation rate with the largest value is a first sub-pixel, and all the other sub-pixels in the display panel are second sub-pixels;
a driving voltage step value determining module, configured to determine a compensated driving voltage difference value between a maximum driving voltage and a minimum driving voltage compensated for the second subpixel according to the driving current attenuation rate of the first subpixel, the driving current attenuation rate of the second subpixel, and an initial driving voltage difference value between a maximum initial driving voltage and a minimum initial driving voltage of the second subpixel; determining a compensated driving voltage step value according to the compensated driving voltage difference value of the second sub-pixel; and
the driving voltage determining module is used for calculating an incremental voltage value of the second sub-pixel according to the compensated driving voltage step value and the gray scale step number under the first preset gray scale, wherein the incremental voltage value is a voltage value of the driving voltage under the first preset gray scale increased relative to the driving voltage under the second preset gray scale, and the difference between the first preset gray scale and the second preset gray scale is a gray scale;
and calculating the driving voltage of the second sub-pixel under the first preset gray scale according to the driving voltage of the second sub-pixel under the second preset gray scale and the incremental voltage value.
As a third aspect of the present invention, an embodiment of the present invention provides a display device, including:
the display panel comprises a plurality of sub-pixels distributed in an array; and
a pixel compensation device, the pixel compensation device comprising:
the pixel current detection circuit is used for acquiring the current driving current of each sub-pixel in the display panel under a first preset gray scale;
the calculating module is used for calculating the driving current attenuation rate of each sub-pixel according to the initial driving voltage of each sub-pixel under the first preset gray scale and the current driving current;
the identification module is configured to identify the driving current attenuation rate with the largest value from the driving current attenuation rates of each sub-pixel, where the sub-pixel corresponding to the driving current attenuation rate with the largest value is a first sub-pixel, and all the other sub-pixels in the display panel are second sub-pixels;
a driving voltage step value determining module, configured to determine a compensated driving voltage difference value between a maximum driving voltage and a minimum driving voltage compensated for the second subpixel according to the driving current attenuation rate of the first subpixel, the driving current attenuation rate of the second subpixel, and an initial driving voltage difference value between a maximum initial driving voltage and a minimum initial driving voltage of the second subpixel; determining a compensated driving voltage step value according to the compensated driving voltage difference value of the second sub-pixel; and
the driving voltage determining module is used for calculating an incremental voltage value of the second sub-pixel according to the compensated driving voltage step value and the gray scale step number under the first preset gray scale, wherein the incremental voltage value is a voltage value of the driving voltage under the first preset gray scale increased relative to the driving voltage under the second preset gray scale, and the difference between the first preset gray scale and the second preset gray scale is a gray scale;
and calculating the driving voltage of the second sub-pixel under the first preset gray scale according to the driving voltage of the second sub-pixel under the second preset gray scale and the incremental voltage value.
According to the pixel compensation method provided by the embodiment of the invention, the pixels are compensated according to the drive current attenuation rate of each sub-pixel under the first preset gray scale, so that the drive current difference between the sub-pixels is smaller no matter how long the display panel is used in the use process, and the probability of color cast or screen burn of the display panel is reduced; in addition, when the second sub-pixels are in different gray scales, the voltage difference values of the second sub-pixels between two adjacent gray scales are adjusted in equal proportion, so that after at least part of the second sub-pixels are subjected to voltage compensation, the gamma curve of the display panel is not shifted, and the display quality of the display panel is improved.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a display device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a display panel of the display device shown in FIG. 1;
FIG. 3 is a cross-sectional view of the display panel of FIG. 2 showing a sub-pixel in the display area along the direction A1-A2;
fig. 4 is a schematic flow chart illustrating a pixel compensation method according to an embodiment of the invention;
fig. 5 is a diagram illustrating a distribution of the circuit attenuation rate of each sub-pixel included in the display panel calculated after step S102 shown in fig. 4;
FIG. 6 is a gamma curve of the display panel at the initial brightness;
FIG. 7 is a gamma curve of the luminance of the display panel at 255 grayscales after the driving current of the first sub-pixel in the display panel is attenuated by 36% and at least a portion of the second sub-pixel is compensated by the pixel compensation method shown in FIG. 4;
FIG. 8 is a gamma curve of the display panel after the luminance of the display panel is normalized after the driving current of the first sub-pixel in the display panel is attenuated by 36% and at least a portion of the second sub-pixels at each gray level are compensated;
FIG. 9 is a flowchart illustrating a pixel compensation method according to another embodiment of the invention;
FIG. 10 is a flowchart illustrating a pixel compensation method according to another embodiment of the present invention;
fig. 11 is a schematic structural diagram of a pixel compensation device according to an embodiment of the invention;
fig. 12 is a schematic structural diagram of a pixel compensation device according to another embodiment of the invention.
[ detailed description ] embodiments
For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
Fig. 1 is a schematic structural diagram of a display device according to an embodiment of the present invention, where the display device in the embodiment of the present invention may be any electronic device with a display function, such as a touch display screen, a mobile phone, a tablet computer, a notebook computer, an electronic paper book, or a television. As shown in fig. 1, the display device includes: a display panel 100, wherein a schematic structural diagram of the display panel 100 is shown in fig. 2, and as shown in fig. 2, the display panel 100 includes an array substrate 11 and a light-emitting layer (not shown in fig. 2) disposed on one side of the array substrate 11, where the light-emitting layer includes a plurality of sub-pixels 120 distributed in an array, and each sub-pixel 120 includes a light-emitting unit 12 (not shown in fig. 2);
a cross-sectional view of a region of the display panel where one sub-pixel is located along a direction a1-a2 is shown in fig. 3, where as shown in fig. 3, the array substrate 11 includes a substrate 110, and a polysilicon layer 111, a gate insulating layer 112, a gate metal layer 113, a first insulating layer 114, a capacitor metal layer 115, a second insulating layer 116, a third insulating layer 117, a source drain metal layer 118, and a planarization layer 119 that are sequentially disposed along a direction away from the substrate 110. Wherein the polysilicon layer 111 includes an active layer, the gate metal layer includes a gate line (not shown in fig. 3), a gate electrode and a first plate, the capacitor metal layer 115 includes a second plate, and the source drain metal layer 118 includes a data line (not shown in fig. 3), a source electrode and a drain electrode; the first and second plates form a storage capacitor Cst, and the source and drain electrodes are connected to the active layer through via holes penetrating the third insulating layer 117, the second insulating layer 116, the first insulating layer 114, and the gate insulating layer 112, respectively.
The light emitting layer includes a plurality of sub-pixels arranged in an array, each sub-pixel including a light emitting unit 12 (i.e., an organic light emitting diode); the light-emitting unit 12 includes an anode 121, an organic light-emitting functional layer 122, and a cathode 123 sequentially stacked in a direction away from the base substrate 110 (in fig. 3, an upward direction), and the organic light-emitting functional layer 122 includes a hole injection layer, a hole transport layer, a light-emitting layer, an electron transport layer, and an electron injection layer sequentially stacked in a direction away from the base substrate 110. Alternatively, the cathodes 123 of all the light emitting cells are of a whole layer structure, so that the display device has a simple structure and is convenient to drive.
The gate line is electrically connected to the gate electrode, the data line is electrically connected to the source electrode, the drain electrode is electrically connected to an anode 121 of the light emitting unit 12 through a through hole penetrating the planarization layer 119, the gate electrode, the active layer, the source electrode, and the drain electrode constitute a driving transistor of the light emitting unit, and the magnitude of current flowing through the light emitting unit 12 can be controlled by the on state of the driving transistor, thereby controlling the luminance of light emitted by the light emitting unit 12.
However, due to the technical limitation of the current organic light emitting materials, the light emitting unit 12 has a larger attenuation ratio of the light emitting brightness of the light emitting unit 12 along with the increase of the service time, especially in the area displaying the fixed icon, the light emitting brightness of the light emitting unit 12 is more seriously attenuated than other areas, thereby causing the problem that the display panel has afterimage (also called burn-in or burning); in addition, since the light emitting unit 12 includes three basic light emitting units of red, blue and green, but due to the limitation of the organic light emitting material, the decay periods of the light emitting materials of the three primary colors of blue, red and green are different, and after a period of time, the light emitting luminance of the light emitting units of blue, red and green decay to different degrees, thereby causing the color cast phenomenon of the display panel.
Therefore, an embodiment of the present invention provides a pixel compensation method, as shown in fig. 4, the pixel compensation method includes the following steps:
step S101: acquiring the current driving current of each sub-pixel in the display panel under a first preset gray scale, for example, the current driving current of each sub-pixel when the display frame is 255 gray scales;
when the display panel is used for displaying and emitting light, the driving current of each sub-pixel is attenuated along with the extension of the service time, that is, the driving current of the same sub-pixel at different time is different, so that optionally, in the step S101, the current driving current of each sub-pixel at the first preset gray scale of the display picture is obtained in real time, the sub-pixels can be compensated in real time, and the probability of color cast or screen burn of the display panel is further reduced.
Specifically, in step S101, the current driving current I of each sub-pixel 120 shown in fig. 2 is obtainedAt present；
Step S102: calculating the driving current attenuation rate of each sub-pixel according to the initial driving voltage and the current driving current of each sub-pixel under the first preset gray scale;
in step S102, according to the initial driving voltage V of each sub-pixel at the first preset gray levelInitialThe initial driving current I of each sub-pixel when the display frame is the first preset gray scale can be calculatedInitialAccording to the present driving current I of each sub-pixel 120 obtained in step S101At presentThat is, the current attenuation rate d of each sub-pixel, i.e., d ═ I, can be calculatedInitial-IAt present)/IInitial(ii) a After the current attenuation rate of each sub-pixel is calculated, the current attenuation rate of each sub-pixel included in the display panel can be obtained;
specifically, after calculating the driving current decay rate of each sub-pixel, the distribution of the circuit decay rate of each sub-pixel included in the display panel is as shown in fig. 5;
step S103: identifying a driving current decay rate with the largest value from the driving current decay rates of each sub-pixel;
in step S102, the driving current attenuation rate distribution of each sub-pixel at the first preset gray level is calculated, so in step S103, the driving current attenuation rate with the largest value is identified from the driving current attenuation rates of each sub-pixel, the sub-pixel corresponding to the driving current attenuation rate with the largest value is defined as the first sub-pixel, and the rest of sub-pixels are defined as the second sub-pixels;
specifically, as shown in fig. 5, the largest driving current decay rate is 36%, and then the sub-pixel corresponding to 36% is defined as the first sub-pixel (e.g., the black-filled sub-pixel in fig. 5), and the sub-pixel having the driving current decay rate smaller than 36% is defined as the second sub-pixel (e.g., the white-filled sub-pixel in fig. 5).
Optionally, the number of the first sub-pixels may be one or multiple, as shown in fig. 5, the number of the first sub-pixels is 2.
After the sub-pixel with the largest driving current attenuation rate is obtained, the driving voltage compensation is performed on at least part of the second sub-pixels according to the largest driving current attenuation rate, so that the driving current of the at least part of the second sub-pixels can be compensated to reduce the luminance difference between the at least part of the second sub-pixels and the first sub-pixels. Specifically, the step of compensating the driving voltage of one second sub-pixel includes:
step S104: determining a compensated driving voltage difference value between the compensated maximum driving voltage and the minimum driving voltage of the second sub-pixel according to the driving current attenuation rate of the first sub-pixel, the driving current attenuation rate of the second sub-pixel and the initial driving voltage difference value between the maximum initial driving voltage and the minimum initial driving voltage of the second sub-pixel;
wherein, when the gray scale of the display panel is 256 gray scales, the maximum initial driving voltage of the second sub-pixel is the initial driving voltage V when the gray scale of the display frame is 255255The minimum initial driving voltage is the initial driving voltage V when the gray scale of the display frame is 00Then the initial driving voltage difference V between the maximum initial driving voltage and the minimum initial driving voltage of the second sub-pixelBefore compensation＝V255 initial-V0 initial；
A compensated drive voltage difference V between the compensated maximum drive voltage and the minimum drive voltage of the second sub-pixelAfter compensation＝VBefore compensation(1-L), wherein L is the decay rate of the first subpixel.
Specifically, as shown in fig. 5, the voltage compensation is performed on the second sub-pixel in the first row and the first column in fig. 5, the driving current attenuation rate of the second sub-pixel is 20%, and the driving current attenuation rate of the first sub-pixel is 36%; the initial driving voltage difference V between the maximum initial driving voltage and the minimum driving voltage of the second sub-pixel is according to 20%, 36%Before compensationDetermining a compensated driving voltage difference V between the compensated maximum driving voltage and the minimum driving voltage of the second sub-pixelAfter compensationAt this time, the compensated driving voltage difference V between the compensated maximum driving voltage and the minimum driving voltage of the second sub-pixelAfter compensation＝VBefore compensation*(1-36％)＝64％*VBefore compensation；
In step S104, the compensated driving voltage difference V of the second sub-pixel in the first row and the first column in FIG. 5 can be calculatedAfter compensation；
Step S105: according to the compensated driving voltage difference V of the second sub-pixelAfter compensationDetermining a driving voltage stepping value delta after compensation;
i.e. according to VAfter compensationTo calculate a second sub-pixel compensationThe subsequent driving voltage step value delta;
alternatively, the driving voltage step value Δ after the second subpixel compensation can be calculated by formula (one), that is, Δ ═ VAfter compensationS (formula one)
And S is a preset number of equally dividing the driving voltage difference value of 0-255 gray scales.
Optionally, S equals 1000.
Specifically, with continued reference to fig. 5, the compensated driving voltage step value Δ of the second sub-pixel in the first row and the first column in fig. 5 is 64% × VBefore compensation(iv) S, i.e. Δ 64% (V)255 initial-V0 initial) S, due to V255 initialAnd V0 initialThe driving voltage step values delta compensated by the second sub-pixel can be calculated;
since Δ is 64% (V)255 initial-V0 initial) S, therefore, due to V255 initialIs an initial driving voltage V when the display frame is 255 gray levels0 initialIs the initial driving voltage when the display frame is at 0 gray level, therefore, no matter what gray level the display frame is at, (V) for the second sub-pixel of the first row and the first column255 initial-V0 initial) Are all equal, i.e. Δ is also equal; for example, Δ of the display screen at the gray level of 100 is equal to Δ of the display screen at the gray level of 200.
The compensated driving voltage step value Δ of the second sub-pixel can be calculated by step S105.
Step S106: calculating the incremental voltage value V of the driving voltage of each second sub-pixel under the first preset gray scale relative to the increment of the driving voltage under the second preset gray scale through the compensated driving voltage step value delta and the gray scale step number under the first preset gray scaleIncreaseWherein, the difference between the first preset gray level and the second preset gray level is a gray level, i.e. the second preset gray level is the upper level gray level of the first preset gray level.
Optionally, VIncreaseCan be obtained by the calculation of the formula (two),
Vincrease＝Δ*NPreset of(formula two);
wherein N isPreset ofThe number of gray scale steps of the second sub-pixel under the first preset gray scale is obtained.
Specifically, with continued reference to FIG. 5, the second sub-pixel in the first row and the first column of FIG. 5 has an increasing voltage V at 255 grayscalesIncrease＝Δ*N255In which N is255The number of steps of the second sub-pixel under 255 gray levels is shown.
Step S106 is to complete the incremental voltage value V of the second sub-pixel increased under the first preset gray scale relative to the second preset gray scaleIncreaseFor example, when the first predetermined gray level is 200 gray levels and the second predetermined gray level is 199 gray levels, V isIncrease 200＝V200-V199。
Step S107: according to the driving voltage of the second sub-pixel under the second preset gray scale and the incremental voltage value VIncreaseAnd calculating the driving voltage of the second sub-pixel under the first preset gray scale.
For example, when the first predetermined gray level is 200 gray levels and the second predetermined gray level is 199 gray levels, V is200＝VIncrease 200+V199。
And V199It can be calculated by steps S101-S107, i.e. V199＝VIncrease 199+V198，V198It can be calculated by steps S101-S107, i.e. V198＝VIncrease 198+V197；
That is, V can be calculated in steps S101 to S1071I.e. V1＝V1. increasing+V0，V0The driving voltage value at 0 gray scale is a known value 0, therefore, V can be calculated through steps S101-S1071、V2、V3……V199、V200……V255。
Step S107 is to complete the calculation of the driving voltage value of the second sub-pixel at the first preset gray level, and the driving voltage of the second sub-pixel calculated in step S107 is transmitted to the gate of the driving transistor for driving the second sub-pixel to emit light, i.e. after step S107, step S108 is executed: namely, it is
And step S108, transmitting the driving voltage of the second sub-pixel to the grid of a driving transistor in the pixel driving circuit of the second sub-pixel through the data signal voltage input end so as to drive the second sub-pixel to emit light.
Specifically, with reference to fig. 5, the driving voltage V of the second sub-pixel in the first row and the first column at the 255 th gray scale is transmitted to the gate of the driving transistor for driving the second sub-pixel to emit light, and the second sub-pixel emits light under the driving of the driving voltage V.
Therefore, after at least a portion of the second sub-pixels in the display panel are compensated by the driving voltages of steps S104 to S108, the difference between the driving current of at least a portion of the second sub-pixels and the driving current of the first sub-pixels is reduced, and therefore, the luminance difference between at least a portion of the second sub-pixels and the first sub-pixels is also smaller, so that the probability of the display panel having afterimages is reduced, and the probability of the display panel having color cast is also reduced. On the other hand, when the display screen is 255 gray scale and the maximum attenuation rate of the driving current of the first sub-pixel is 36% (i.e. the brightness is 350nit), after at least part of the second sub-pixels are compensated, the gamma curve of the display panel is as shown in fig. 6, and fig. 7 is the gamma curve of the initial brightness (the brightness is 500nit) when the display screen is 255 gray scale; as shown in FIG. 6 and FIG. 7, when the display panel has a gray scale of 255, the gamma curve before and after the voltage compensation of at least a portion of the second sub-pixels does not shift, because V isIncrease＝Δ*NPreset ofFor the same sub-pixel, calculating V at each first preset gray levelIncreaseEquation V utilizedIncrease＝Δ*NPreset ofΔ in (a) is constant, i.e., the slope in the formula is constant. Therefore, the pixel compensation method improves the display quality of the display panel.
When the display frame is at each gray scale, at least a part of the second sub-pixels in the display panel are compensated according to the compensation method from step S101 to step S108, because the second sub-pixels are driven at the first preset gray scaleThe voltage is relative to the increasing voltage value V of the driving voltage under the upper-level gray scaleIncrease＝Δ*NPreset ofAnd Δ ═ V255 initial-V0 initial) (1-L)/S, in the same sub-pixel and under the condition that the attenuation rate of the driving current is the same, no matter which gray scale of the display screen of the display panel is, Δ of the sub-pixel is equal, so that the incremental value of the driving voltage of the second sub-pixel at each gray scale relative to the driving voltage of the previous gray scale is adjusted in equal proportion, namely, is multiplied by Δ. Then, after at least a portion of the second sub-pixels in the display panel are compensated at each gray level, the gamma curve is normalized, and the obtained curve is as shown in fig. 8, that is, the normalized gamma curve is not shifted.
In an embodiment of the invention, in step S106, the gray scale stepping number N of the second sub-pixel under the first predetermined gray scale isPreset ofCalculating according to a formula (III);
wherein, the formula (III) is:
Npreset ofAnd M is S/255, wherein M is a preset coefficient under the first preset gray scale.
Wherein, when the gray scale level is smaller, the number of M is smaller, and when the gray scale level is larger, the number of M is larger. For example,
the 10 th gray scale, M can be 1; the 200 th gray level, M may be 3. Wherein S is a preset number of evenly divided driving voltage difference values of 0-255 gray scales, and in general, the value of S is fixed and the value of M is also fixed under each gray scale for the same type of display panel, so that the gray scale stepping number N under each gray scale isPreset ofAlso fixed, in other words, under the condition that the attenuation rates of the driving currents of different sub-pixels or the same sub-pixel are different, the gray scale stepping number N of each sub-pixel under the same gray scalePreset ofAre all the same.
For convenience of understanding, the following description will take three sub-pixels (for example, a blue sub-pixel, a red sub-pixel, and a green sub-pixel, and the initial driving voltage difference values of the three sub-pixels are all 5V), and the brightness compensation method when the three sub-pixels are at different gray levels as an example:
when the display screen of the display panel displays 200 gray scales, at the same time, the driving current attenuation rate of the blue sub-pixel is 30%, the driving current attenuation rate of the red sub-pixel is 20%, and the driving current attenuation rate of the green sub-pixel is 10%, namely, the blue sub-pixel is the first sub-pixel, the red sub-pixel and the green sub-pixel are two second sub-pixels, and since 30% -20% is 10% greater than 5%, the red sub-pixel needs to be voltage compensated, therefore, the increasing voltage V between the driving voltage value of the red sub-pixel at the 200 gray scale and the driving voltage value at the 199 gray scale is increasedIncreasing red color＝Δ*NPreset ofWherein Δ ═ V255 initial-V0 initial)*(1-30％)/S＝5*70％/1000＝0.0035
Then VIncreasing red color＝Δ*NPreset of＝0.0035*NPreset of；
Similarly, since 30% -10% is 20% > 5%, the green sub-pixel needs to compensate the driving voltage, and the incremental voltage V between the driving voltage value of the green sub-pixel at the gray level of 200 and the driving voltage value of the green sub-pixel at the gray level of 199Increasing green color＝Δ*NPreset ofWherein Δ ═ V255 initial-V0 initial)*(1-30％)/S＝5*70％/1000＝0.0035；
Then VIncreasing green color＝Δ*NPreset of＝0.0035*NPreset of。
That is, the driving voltage at the 200 th gray level of the red sub-pixel and the driving voltage at the 199 th gray level of the green sub-pixel are equal in increment, and since the driving voltage value of each gray level can be calculated through the steps S101 to S108, after compensation, the driving current at the 200 th gray level of the green sub-pixel, the driving current at the 200 th gray level of the red sub-pixel and the driving current at the 200 th gray level of the blue sub-pixel are equal or have a small difference, so that the luminance at the 200 th gray level of the green sub-pixel, the luminance at the 200 th gray level of the red sub-pixel and the luminance at the 200 th gray level of the blue sub-pixel have no or a small difference, and therefore, the probability of color cast or screen burn-in the display panel is reduced.
Similarly, when the display panel displays the pictureWhen displaying 10 gray scales, at the same time, the attenuation rate of the driving current of the blue sub-pixel is 20%, the attenuation rate of the driving current of the red sub-pixel is 13%, and the attenuation rate of the driving current of the green sub-pixel is 10%, that is, the blue sub-pixel is the first sub-pixel, the red sub-pixel and the green sub-pixel are two second sub-pixels, and since 20% -13% is 7% greater than 5%, the voltage compensation is required for the red sub-pixel, and therefore, the incremental voltage V between the driving voltage value of the red sub-pixel at 10 gray scales and the driving voltage value at 9 gray scales is required for the red sub-pixelIncreasing red color＝Δ*NPreset ofWherein Δ ═ V255 initial-V0 initial)*(1-20％)/S＝5*80％/1000＝0.004；
Then VIncreasing red color＝Δ*NPreset of＝0.004*NPreset of；
Similarly, since 20% -10% > 10%, the green sub-pixel needs to compensate the driving voltage, and the incremental voltage V between the driving voltage value of the green sub-pixel at the 10 gray level and the driving voltage value at the 9 gray levelIncreasing green color＝Δ*NPreset ofWherein Δ ═ V255 initial-V0 initial)*(1-20％)/S＝5*80％/1000＝0.004；
Then VIncreasing green color＝Δ*NPreset of＝0.004*NPreset of。
That is, the driving voltage at the 10 th gray scale is equal to the increment of the driving voltage at the 9 th gray scale, and the driving voltage value of each gray scale can be calculated through steps S101 to S108, so that after compensation, when the display screen is at the 10 th gray scale, the driving current of the blue sub-pixel is equal to or slightly different from the driving current of the red sub-pixel, and therefore, the luminance of the green sub-pixel at the 10 th gray scale, the luminance of the red sub-pixel at the 10 th gray scale and the luminance of the blue sub-pixel at the 10 th gray scale have no difference or only a small difference, and therefore, the probability of color cast or burn-in of the display panel is reduced.
The driving voltage increment and N of two adjacent gray levels with 200-level display frame and 10-level display framePreset ofThere is a relationship that the larger the number of gray scale levels, NPreset ofThe larger the gamma curve, the larger the gamma curve of the entire display panel is compared to the gamma curve before compensation, since the compensation is performed for a portion of the second sub-pixels in the display panel at each gray level.
In an embodiment of the present invention, as shown in fig. 9, between step S103 and step S104, the pixel compensation method further includes step S1031, that is,
step S1031: judging whether the absolute value of the difference between the driving current attenuation rate of the second sub-pixel and the driving current attenuation rate of the first sub-pixel is larger than a first preset value or not;
when the absolute value of the difference between the attenuation rate of the driving current of the second sub-pixel and the attenuation rate of the driving current of the first sub-pixel is greater than the first preset value, step S104 is executed, that is, a compensated driving voltage difference value between the compensated maximum driving voltage and the minimum driving voltage of the second sub-pixel is determined according to the attenuation rate of the driving current of the first sub-pixel, the attenuation rate of the driving current of the second sub-pixel, and the initial driving voltage difference value between the maximum initial driving voltage and the minimum initial driving voltage of the second sub-pixel. Namely, the second sub-pixel is subjected to voltage compensation, so that the difference between the driving current of the second sub-pixel and the driving current of the first sub-pixel is smaller.
When the absolute value of the difference between the attenuation rate of the driving current of the second sub-pixel and the attenuation rate of the driving current of the first sub-pixel is less than or equal to the first preset value, step S109 is executed
Step S108: and transmitting the original driving voltage of the second sub-pixel under the first preset gray scale to the grid of a driving transistor in a pixel driving circuit of the second sub-pixel so as to drive the second sub-pixel to emit light. I.e. without voltage compensation for the second sub-pixel.
According to the embodiment of the invention, when the absolute value of the difference between the driving current attenuation rate of the second sub-pixel and the driving current attenuation rate of the first sub-pixel is greater than the first preset value, the second sub-pixel is compensated, and the second sub-pixel which is not much different from the driving current attenuation rate of the first sub-pixel is not compensated, so that the calculation difficulty in the compensation process is reduced, and the efficiency and the accuracy of pixel compensation are improved.
Optionally, the first predetermined value is equal to 5%. When the absolute value of the difference between the driving current attenuation rate of the second sub-pixel and the driving current attenuation rate of the first sub-pixel is more than 5%, voltage compensation is carried out on the second sub-pixel; specifically, referring to fig. 5, since the driving current attenuation rate of the first sub-pixel is 36%, the voltage compensation is not performed on the second sub-pixel having the driving current attenuation rate greater than or equal to 31% and less than 36%, that is, the second sub-pixel enclosed by the dashed line in fig. 5; and performing voltage compensation on the second sub-pixel with the absolute value of the difference between the driving current attenuation rate and the driving current attenuation rate of the first sub-pixel being more than 5%.
In another embodiment of the present invention, as shown in fig. 10, the pixel compensation method further includes: step S1091, i.e.
Step S1091: and transmitting the original driving voltage of the first sub-pixel under the first preset gray scale to the grid of a driving transistor in a pixel driving circuit of the first sub-pixel so as to drive the first sub-pixel to emit light. I.e. no voltage compensation is performed for the first sub-pixel.
Step S108 is to perform voltage compensation on the second sub-pixel where the absolute value of the difference between the driving current attenuation rate and the maximum driving current attenuation rate is greater than a first preset value, that is, the actual driving voltage of the second sub-pixel is equal to the sum of the original driving voltage and the compensated driving voltage;
step S1091 is to perform no voltage compensation on the first sub-pixel (i.e., the sub-pixel with the largest driving current decay rate), that is, the driving voltage of the first sub-pixel is still the original driving voltage;
in step S109, the second subpixel having the absolute value of the difference between the driving current decay rate and the maximum driving current decay rate less than or equal to the first predetermined value is not compensated for by any voltage, i.e., the driving voltage of the second subpixel is the original driving voltage, so that step S108, step S109 and step S1091 are performed simultaneously when the subpixels are actually driven to emit light.
As a second aspect of the present invention, fig. 11 is a schematic structural diagram of a pixel compensation apparatus according to an embodiment of the present invention, and as shown in fig. 11, the pixel compensation apparatus includes:
the pixel current detection circuit 13 is configured to obtain a current driving current of each sub-pixel in the display panel at a first preset gray level;
the calculating module 14 is configured to calculate a driving current decay rate of each sub-pixel according to an initial driving voltage of each sub-pixel at a first preset gray level and a current driving current;
the identifying module 15 is configured to identify a driving current attenuation rate with a largest value from the driving current attenuation rates of each sub-pixel, where the sub-pixel corresponding to the driving current attenuation rate with the largest value is a first sub-pixel, and all other sub-pixels in the display panel are second sub-pixels;
a driving voltage step value determining module 16, configured to determine a compensated driving voltage difference value between the maximum driving voltage and the minimum driving voltage compensated by the second subpixel according to the driving current attenuation rate of the first subpixel, the driving current attenuation rate of the second subpixel, and an initial driving voltage difference value between the maximum initial driving voltage and the minimum initial driving voltage of the second subpixel; determining a compensated driving voltage stepping value according to the compensated driving voltage difference value of the second sub-pixel; and
the driving voltage determining module 17 is configured to calculate, according to the compensated driving voltage step value and the number of gray scale steps under the first preset gray scale, an incremental voltage value of the driving voltage of the second sub-pixel increased relative to the second preset gray scale under the first preset gray scale, where a difference between the first preset gray scale and the second preset gray scale is a gray scale; and calculating the driving voltage of the second sub-pixel under the first preset gray scale according to the driving voltage of the second sub-pixel under the second preset gray scale and the incremental voltage value.
The specific process of compensating the pixel by the pixel compensation device in the embodiment of the present invention adopts the process in the pixel compensation method, and details are not repeated again.
The pixel compensation device provided by the embodiment of the invention can compensate the pixels according to the drive current attenuation rate of each sub-pixel under the first preset gray scale, so that the drive current difference between the sub-pixels is small no matter how long the display panel is used in the use process, and the probability of color cast or screen burning of the display panel is reduced; in addition, when the second sub-pixels are in different gray scales, the voltage difference values of the second sub-pixels between two adjacent gray scales are adjusted in equal proportion, so that after at least part of the second sub-pixels are subjected to voltage compensation, the gamma curve of the display panel is not shifted, and the display quality of the display panel is improved. In an embodiment of the present invention, as shown in fig. 12, the driving voltage step value determining module 16 includes:
a compensated driving voltage difference determining unit 161, configured to determine a compensated driving voltage difference between the compensated maximum driving voltage and the minimum driving voltage of the second subpixel according to the driving current attenuation rate of the first subpixel, the driving current attenuation rate of the second subpixel, and the initial driving voltage difference between the maximum initial driving voltage and the minimum initial driving voltage of the second subpixel;
a storage unit 162, configured to store a formula (one), where the formula (one) is: Δ ═ VAfter compensationS, where Δ is the driving voltage step value of the second sub-pixel, VAfter compensationThe compensated driving voltage difference value of the second sub-pixel is S, and S is a preset number of the driving voltage difference values of 0-255 gray scales are divided equally; and
and a step value calculating unit 163, configured to calculate the compensated driving voltage difference value of the second subpixel by using formula (one), and generate a driving voltage step value of the second subpixel.
The specific working process of each unit in the specific driving voltage step value determining module adopts the process of the pixel compensation method, which is not described herein again.
As a third aspect of the present invention, an embodiment of the present invention provides a display device, including:
the display panel comprises a plurality of sub-pixels distributed in an array; and
a pixel compensation device, wherein the pixel compensation device comprises:
the pixel current detection circuit 13 is configured to obtain a current driving current of each sub-pixel in the display panel at a first preset gray level;
the calculating module 14 is configured to calculate a driving current decay rate of each sub-pixel according to an initial driving voltage of each sub-pixel at a first preset gray level and a current driving current;
the identifying module 15 is configured to identify a driving current attenuation rate with a largest value from the driving current attenuation rates of each sub-pixel, where the sub-pixel corresponding to the driving current attenuation rate with the largest value is a first sub-pixel, and all other sub-pixels in the display panel are second sub-pixels;
a driving voltage step value determining module 16, configured to determine a compensated driving voltage difference value between the maximum driving voltage and the minimum driving voltage compensated by the second subpixel according to the driving current attenuation rate of the first subpixel, the driving current attenuation rate of the second subpixel, and an initial driving voltage difference value between the maximum initial driving voltage and the minimum initial driving voltage of the second subpixel; determining a compensated driving voltage stepping value according to the compensated driving voltage difference value of the second sub-pixel; and
the driving voltage determining module 17 is configured to calculate, according to the compensated driving voltage step value and the number of gray scale steps under the first preset gray scale, an incremental voltage value of the driving voltage of the second sub-pixel increased relative to the second preset gray scale under the first preset gray scale, where a difference between the first preset gray scale and the second preset gray scale is a gray scale; and calculating the driving voltage of the second sub-pixel under the first preset gray scale according to the driving voltage of the second sub-pixel under the second preset gray scale and the incremental voltage value.
When the display panel is used, the pixel compensation device can compensate the sub-pixels of the display panel in real time, so that the difference of the driving current among the sub-pixels is small no matter how long the display panel is used in the using process of the display panel, and the probability of color cast or screen burning of the display panel is reduced; in addition, when the second sub-pixels are in different gray scales, the voltage difference values of the second sub-pixels between two adjacent gray scales are adjusted in equal proportion, so that after at least part of the second sub-pixels are subjected to voltage compensation, the gamma curve of the display panel is not shifted, and the display quality of the display panel is improved.
In an embodiment of the invention, a structural diagram of the display panel is shown in fig. 2, a cross-sectional view of a display area where one sub-pixel in the display panel is located along a direction a1-a is shown in fig. 3, and the pixel detection circuit 13 (not shown in fig. 3) is electrically connected to the anode 121 of the light emitting unit 12 to detect a driving current of the pixel.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (15)

1. A pixel compensation method, comprising:
acquiring the current driving current of each sub-pixel in the display panel under a first preset gray scale;
calculating the driving current attenuation rate of each sub-pixel according to the initial driving voltage of each sub-pixel under the first preset gray scale and the current driving current;
identifying the driving current attenuation rate with the largest value from the driving current attenuation rates of each sub-pixel, wherein the sub-pixel corresponding to the driving current attenuation rate with the largest value is a first sub-pixel, and the rest of sub-pixels in the display panel are all second sub-pixels;
determining a compensated driving voltage difference value between the compensated maximum driving voltage and the minimum driving voltage of the second sub-pixel according to the driving current attenuation rate of the first sub-pixel, the driving current attenuation rate of the second sub-pixel, and an initial driving voltage difference value between the maximum initial driving voltage and the minimum initial driving voltage of the second sub-pixel;
determining a compensated driving voltage step value according to the compensated driving voltage difference value of the second sub-pixel, and calculating an incremental voltage value of the second sub-pixel according to the compensated driving voltage step value and the gray scale step number under a first preset gray scale, wherein the incremental voltage value is a voltage value of the driving voltage under the first preset gray scale increased relative to the driving voltage under a second preset gray scale, and the difference between the first preset gray scale and the second preset gray scale is a gray scale;
and calculating the driving voltage of the second sub-pixel under the first preset gray scale according to the driving voltage of the second sub-pixel under the second preset gray scale and the incremental voltage value.
2. The pixel compensation method according to claim 1, wherein after calculating the driving voltage of the second sub-pixel at the first predetermined gray scale according to the driving voltage of the second sub-pixel at the second predetermined gray scale and the incremental voltage value, the pixel compensation method further comprises:
and transmitting the driving voltage of the second sub-pixel to a gate of a driving transistor in a pixel driving circuit of the second sub-pixel through a data signal voltage input end so as to drive the second sub-pixel to emit light.
3. The pixel compensation method of claim 1, wherein determining a compensated drive voltage step value from the compensated drive voltage difference value of the second sub-pixel comprises:
calculating the compensated driving voltage difference value of the second sub-pixel by a formula (I) to generate a driving voltage stepping value of the second sub-pixel;
wherein the formula (one) is:
Δ＝Vafter compensationS (formula one)
Wherein Δ is a driving voltage step value of the second sub-pixel, VAfter compensationThe compensated driving voltage difference value of the second sub-pixel is S, and S is a preset number of the driving voltage difference values of 0-255 gray scales are divided equally;
wherein L is the decay rate of the first sub-pixel.
4. The pixel compensation method according to claim 3, wherein the calculating the incremental voltage value of the second sub-pixel by the compensated driving voltage step value and the number of gray scale steps at a first preset gray scale comprises:
calculating the compensated driving voltage stepping value and the gray scale stepping number under the first preset gray scale through a formula (II) to generate an incremental voltage value of the second sub-pixel;
wherein the formula (two) is:
Vincrease＝Δ*NPreset of(ii) a Wherein N isPreset ofAnd the gray scale stepping number of the second sub-pixel under the first preset gray scale is obtained.
5. The pixel compensation method according to claim 4, wherein the number of gray scale steps of the second sub-pixel at the first preset gray scale is calculated by a formula (III);
wherein, the formula (III) is:
Npreset ofAnd M is S/255, wherein M is a preset coefficient under the first preset gray scale.
6. The pixel compensation method according to claim 1, wherein after identifying the driving current decay rate with the largest value among the driving current decay rates of each of the sub-pixels, and before determining a compensated driving voltage difference between the compensated maximum driving voltage and the minimum driving voltage of the second sub-pixel according to the driving current decay rate of the first sub-pixel, the driving current decay rate of the second sub-pixel, and an initial driving voltage difference between a maximum initial driving voltage and a minimum initial driving voltage of the second sub-pixel, the pixel compensation method further comprises:
judging whether the absolute value of the difference between the driving current attenuation rate of the second sub-pixel and the driving current attenuation rate of the first sub-pixel is larger than a first preset value or not;
when the absolute value of the difference between the driving current decay rate current of the second sub-pixel and the driving current decay rate of the first sub-pixel is greater than the first preset value, determining a compensated driving voltage difference value between the compensated maximum driving voltage and the minimum driving voltage of the second sub-pixel according to the driving current decay rate of the first sub-pixel, the driving current decay rate of the second sub-pixel, and an initial driving voltage difference value between the maximum initial driving voltage and the minimum initial driving voltage of the second sub-pixel.
7. The pixel compensation method according to claim 6, wherein the first predetermined value is equal to 5%.
8. The pixel compensation method according to claim 6, wherein when an absolute value of a difference between the driving current decay rate of the second sub-pixel and the driving current decay rate of the first sub-pixel is less than or equal to the first preset value;
the pixel compensation method further includes:
and transmitting the original driving voltage of the second sub-pixel under the first preset gray scale to the grid of a driving transistor in a pixel driving circuit of the second sub-pixel so as to drive the second sub-pixel to emit light.
9. The pixel compensation method according to claim 1, further comprising:
and transmitting the original driving voltage of the first sub-pixel under the first preset gray scale to the grid of a driving transistor in a pixel driving circuit of the first sub-pixel so as to drive the first sub-pixel to emit light.
10. The pixel compensation method of claim 1, wherein the number of the first sub-pixels is greater than or equal to two.
11. The pixel compensation method according to claim 1, wherein the obtaining a current driving current of each sub-pixel in the display panel at a first preset gray level comprises:
and acquiring the current driving current of each sub-pixel in the display panel under the first preset gray scale in real time.
12. A pixel compensation apparatus, comprising:
the pixel current detection circuit is used for acquiring the current driving current of each sub-pixel in the display panel under a first preset gray scale;
the calculating module is used for calculating the driving current attenuation rate of each sub-pixel according to the initial driving voltage of each sub-pixel under the first preset gray scale and the current driving current;
the identification module is configured to identify the driving current attenuation rate with the largest value from the driving current attenuation rates of each sub-pixel, where the sub-pixel corresponding to the driving current attenuation rate with the largest value is a first sub-pixel, and all the other sub-pixels in the display panel are second sub-pixels;
a driving voltage step value determining module, configured to determine a compensated driving voltage difference value between a maximum driving voltage and a minimum driving voltage compensated for the second subpixel according to the driving current attenuation rate of the first subpixel, the driving current attenuation rate of the second subpixel, and an initial driving voltage difference value between a maximum initial driving voltage and a minimum initial driving voltage of the second subpixel; determining a compensated driving voltage step value according to the compensated driving voltage difference value of the second sub-pixel; and
the driving voltage determining module is used for calculating an incremental voltage value of the second sub-pixel according to the compensated driving voltage step value and the gray scale step number under the first preset gray scale, wherein the incremental voltage value is a voltage value of the driving voltage under the first preset gray scale increased relative to the driving voltage under the second preset gray scale, and the difference between the first preset gray scale and the second preset gray scale is a gray scale;
and calculating the driving voltage of the second sub-pixel under the first preset gray scale according to the driving voltage of the second sub-pixel under the second preset gray scale and the incremental voltage value.
13. The pixel compensation apparatus of claim 12, wherein the driving voltage step value determination module comprises:
a compensated driving voltage difference determining unit, configured to determine a compensated driving voltage difference between the maximum driving voltage and the minimum driving voltage compensated for the second sub-pixel according to the driving current attenuation rate of the first sub-pixel, the driving current attenuation rate of the second sub-pixel, and an initial driving voltage difference between the maximum initial driving voltage and the minimum initial driving voltage of the second sub-pixel;
a storage unit, configured to store a formula (one), where the formula (one) is: Δ ═ VAfter compensation(1-L)/S, wherein Δ is the voltage step value of the second sub-pixel, VAfter compensationThe compensated driving voltage difference value of the second sub-pixel is S, and S is a preset number of the driving voltage difference values of 0-255 gray scales are divided equally; l is the attenuation rate of the first sub-pixel; and
and the stepping value calculating unit is used for calculating the compensated driving voltage difference value of the second sub-pixel through a formula (I) to generate a driving voltage stepping value of the second sub-pixel.
14. A display device, comprising:
the display panel comprises a plurality of sub-pixels distributed in an array; and
a pixel compensation device, the pixel compensation device comprising:
the pixel current detection circuit is used for acquiring the current driving current of each sub-pixel in the display panel under a first preset gray scale;
the calculating module is used for calculating the driving current attenuation rate of each sub-pixel according to the initial driving voltage of each sub-pixel under the first preset gray scale and the current driving current;
the identification module is configured to identify the driving current attenuation rate with the largest value from the driving current attenuation rates of each sub-pixel, where the sub-pixel corresponding to the driving current attenuation rate with the largest value is a first sub-pixel, and all the other sub-pixels in the display panel are second sub-pixels;
a driving voltage step value determining module, configured to determine a compensated driving voltage difference value between a maximum driving voltage and a minimum driving voltage compensated for the second subpixel according to the driving current attenuation rate of the first subpixel, the driving current attenuation rate of the second subpixel, and an initial driving voltage difference value between a maximum initial driving voltage and a minimum initial driving voltage of the second subpixel; determining a compensated driving voltage step value according to the compensated driving voltage difference value of the second sub-pixel; and
the driving voltage determining module is used for calculating an incremental voltage value of the second sub-pixel according to the compensated driving voltage step value and the gray scale step number under the first preset gray scale, wherein the incremental voltage value is a voltage value of the driving voltage under the first preset gray scale increased relative to the driving voltage under the second preset gray scale, and the difference between the first preset gray scale and the second preset gray scale is a gray scale;
and calculating the driving voltage of the second sub-pixel under the first preset gray scale according to the driving voltage of the second sub-pixel under the second preset gray scale and the incremental voltage value.
15. The display device according to claim 14,
each of the sub-pixels includes a light emitting unit,
the pixel current detection circuit is electrically connected with the anode of the light emitting unit.
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