WO2020232588A1 - Appareil et procédé de commande de luminosité d'affichage - Google Patents

Appareil et procédé de commande de luminosité d'affichage Download PDF

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Publication number
WO2020232588A1
WO2020232588A1 PCT/CN2019/087497 CN2019087497W WO2020232588A1 WO 2020232588 A1 WO2020232588 A1 WO 2020232588A1 CN 2019087497 W CN2019087497 W CN 2019087497W WO 2020232588 A1 WO2020232588 A1 WO 2020232588A1
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Prior art keywords
target
value
brightness
voltage
compensation
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PCT/CN2019/087497
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English (en)
Chinese (zh)
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陳伯銘
许景翔
彭德彰
刘洋
罗琨
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华为技术有限公司
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Priority to CN201980085981.5A priority Critical patent/CN113228152B/zh
Priority to PCT/CN2019/087497 priority patent/WO2020232588A1/fr
Publication of WO2020232588A1 publication Critical patent/WO2020232588A1/fr

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3233—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
    • 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
    • G09G3/34—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 by control of light from an independent source
    • G09G3/36—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 by control of light from an independent source using liquid crystals

Definitions

  • This application relates to the field of display displays, and in particular, to a device and method for controlling screen brightness.
  • OLED display devices are the main development direction of next-generation mobile phone panels due to their advantages of self-luminescence, thin thickness, high contrast, and large viewing angle. Among them, Active-matrix organic light emitting diode (AMOLED) has become a development focus because of its good flexibility.
  • AMOLED Active-matrix organic light emitting diode
  • screens usually use organic polymer materials such as OLED and AMOLED, which are often prone to aging behaviors such as thermal aging, moisture aging, and light aging.
  • OLED and AMOLED organic polymer materials
  • these organic light-emitting diodes in the screen age, their physical characteristics will also change, causing a certain pixel or a certain area of the screen to emit light unevenly or reduce efficiency compared with other pixels. This pixel or area is generally called Branding or burning screen.
  • OLEDs organic light-emitting diodes
  • the aging of these organic light-emitting diodes will continue to increase, resulting in greater changes in the physical characteristics of these organic light-emitting diodes.
  • the aging degree of different organic light emitting diodes in the screen may be different.
  • the LED corresponding to a pixel is aging, the actual brightness value displayed by the pixel is often different from the theoretical brightness value of the pixel in the input image source, and as the aging degree of the LED increases, the actual brightness of the pixel is The difference between the displayed brightness value and its theoretical brightness value will become larger and larger.
  • Burn-in compensation is to compensate and eliminate the aging pixels or areas. Therefore, in order to make the brightness of the image displayed on the screen consistent with the original brightness of the input image source, it is necessary to compensate the brightness of the pixels corresponding to the aging light-emitting diodes in the screen.
  • the embodiments of the present application provide a device and method for controlling screen brightness, which can effectively compensate the brightness of pixels in the screen, so that the brightness of the image displayed on the screen is basically consistent with the original brightness of the input image source.
  • an embodiment of the present application provides a device for controlling screen brightness.
  • the device includes: a burn-in compensation module for obtaining the target pixel when the current display brightness value is inconsistent with the target brightness value on the screen.
  • Grayscale value or reference grayscale value where the target grayscale value is a grayscale value that compensates for the brightness of the target pixel, and the reference grayscale value is a grayscale value that compensates for the brightness of a reference pixel ,
  • the reference pixel is other pixels in the screen except the target pixel; a digital-to-analog converter is used to control the display brightness of the target pixel according to the target grayscale value; or, The digital-to-analog converter is configured to control the display brightness of the reference pixel according to the reference grayscale value.
  • the brightness of the target pixel is compensated to make the target pixel display the target brightness value, or the brightness of the reference pixel In this way, the actual displayed brightness value of the reference pixel matches the current displayed brightness value of the target pixel to improve the overall display effect of the screen.
  • the brightness of the target pixel on the screen is inconsistent with the target brightness value
  • the brightness of the target pixel is compensated or the brightness of the pixel on the screen other than the target pixel is compensated.
  • the brightness compensation can effectively improve the display effect of the screen.
  • the burn-in compensation module is specifically configured to obtain the target when the current display brightness value is inconsistent with the target brightness value due to the aging of the light emitting diode corresponding to the target pixel.
  • the grayscale value or the reference grayscale value, the target brightness value is the theoretical brightness value of the target pixel in the input image source;
  • the digital-to-analog converter is specifically configured to perform according to the target grayscale value Control the display brightness of the target pixel to the target brightness value; or, the digital-to-analog converter is specifically configured to control the display brightness of the reference pixel to the reference brightness value according to the reference grayscale value, so
  • the reference brightness value is positively correlated with the current display brightness value.
  • the brightness of the target pixel is compensated so that the target pixel displays the target
  • the brightness value, or the brightness of the reference pixel to make the reference pixel display the reference brightness value can effectively solve the screen display effect caused by the current display brightness value of the target pixel on the screen and the target brightness value. The serious problem of falling.
  • the burn-in compensation module is specifically configured to obtain the target grayscale value when the aging degree of the light emitting diode corresponding to the target pixel meets a preset condition, so that the The digital-to-analog converter controls the display brightness of the target pixel according to the target grayscale value; when the aging degree of the light emitting diode corresponding to the target pixel does not meet a preset condition, obtains the reference grayscale value to The digital-to-analog converter controls the display brightness of the reference pixel according to the reference grayscale value.
  • the brightness of the target pixel can be compensated so that the target pixel can display the target brightness value; when the light-emitting diode corresponding to the target pixel has the When the aging degree does not meet the preset condition, even if the brightness of the target pixel is compensated, the target pixel cannot display the target brightness value when it is not aging, that is, the aging degree of the target pixel is serious and cannot be compensated by compensation.
  • the brightness of the reference pixel is compensated so that the display brightness of the reference pixel of the target pixel is compatible with the display brightness of the target pixel.
  • the purpose of compensating the brightness of the reference pixel is to make the overall display effect of the screen better.
  • the preset condition is that the target grayscale value is greater than the limit grayscale value.
  • the gray scale value that the digital-to-analog converter can handle has a certain range.
  • the limit gray scale value is the maximum gray scale value that the digital-to-analog converter can handle.
  • the burn-in compensation module is specifically configured to determine the target grayscale value or the reference grayscale value based on a burn-in compensation look-up table, and the burn-in compensation look-up table is used to characterize Correspondence between the aging degree of the light emitting diode corresponding to the pixel and the gray scale compensation value.
  • the screen burn compensation module can quickly determine the target gray scale value or the reference gray scale value based on the screen burn compensation lookup table, which is simple to implement.
  • the device further includes: a detection circuit configured to obtain a feedback voltage of a target pixel driving circuit of the target pixel point, the target pixel driving circuit including the light emitting diode and a driving tube, The feedback voltage is related to the aging degree of the light emitting diode corresponding to the target pixel; the application processor AP is configured to determine the burn-in compensation look-up table according to the feedback voltage and a pre-stored characteristic curve table, and the characteristic The curve table is used to characterize the correspondence between the voltage between the drain and source of the drive tube and the current in the light-emitting diode when the light-emitting diode is at a specified degree of aging, and to characterize when the drive tube is When the voltage between the gate and the source is fixed, the corresponding relationship between the voltage between the drain and the source and the current in the light emitting diode.
  • a detection circuit configured to obtain a feedback voltage of a target pixel driving circuit of the target pixel point, the target pixel driving circuit including the light emitting
  • the pre-stored characteristic curve table may include at least one set of correspondences between the voltage between the drain and the source of the drive tube and the current in the light-emitting diode when the light-emitting diode is at a specified degree of aging.
  • the specified aging degree can be any aging degree.
  • the pre-stored characteristic curve table may include multiple sets of correspondences between the voltage between the drain and the source of the driving tube and the current in the light-emitting diode when the light-emitting diode is at different aging degrees.
  • the feedback voltage is used to determine the current aging degree of the light-emitting diode.
  • the detection circuit may be an analog-to-digital converter ADC.
  • the application processor can accurately and quickly determine the grayscale compensation values corresponding to the pixels corresponding to the light-emitting diodes with different aging degrees according to the feedback voltage and the pre-stored characteristic curve table.
  • the device further includes: a detection circuit configured to obtain a feedback voltage of a target pixel drive circuit of the target pixel point, the target pixel drive circuit includes a light emitting diode, and the feedback voltage is The aging degree of the light emitting diode corresponding to the target pixel is related; the application processor AP is configured to determine the target grayscale value or the reference grayscale value according to the feedback voltage and a pre-stored characteristic curve table, The target grayscale value or the reference grayscale value is stored in a memory, and the characteristic curve table is used to characterize the difference between the drain and the source of the driving tube when the light-emitting diode is at a specified aging level.
  • a detection circuit configured to obtain a feedback voltage of a target pixel drive circuit of the target pixel point
  • the target pixel drive circuit includes a light emitting diode
  • the feedback voltage is The aging degree of the light emitting diode corresponding to the target pixel is related
  • the application processor AP is configured to determine the target gray
  • the corresponding relationship between the voltage and the current in the light-emitting diode and is used to characterize the voltage between the drain and the source when the voltage between the gate and the source of the drive tube is constant
  • the burn-in compensation module is specifically configured to obtain the target grayscale value or the reference grayscale value from the memory.
  • the application processor calculates the gray-scale compensation values corresponding to the pixel points corresponding to the light-emitting diodes with different aging degrees according to the feedback voltage and the pre-stored characteristic curve table.
  • the calculated compensation value is more accurate, and the memory is Instead of storing a large number of compensation values in advance, the AP calculates the compensation value according to the degree of aging, saving storage space.
  • the AP is specifically configured to determine the first compensation value according to the feedback voltage and the pre-stored characteristic curve table; the digital-to-analog converter is further configured to determine the first compensation value according to the first A compensation value is used to obtain an intermediate drive voltage, and the intermediate drive voltage is used to control the target pixel drive circuit; the AP is specifically used to determine the target according to the intermediate drive voltage and the pre-stored photoelectric characteristic curve table Grayscale value.
  • the application processor successively determines two gray-scale compensation values, and the burn-in compensation module can successively compensate the brightness of the target pixel twice, with high compensation accuracy.
  • the target pixel drive circuit further includes a drive tube
  • the pre-stored characteristic curve table includes: an aging compensation correspondence relationship and a photoelectric characteristic correspondence relationship
  • the aging compensation correspondence relationship is used to characterize all The corresponding relationship between the voltage between the drain and the source of the drive tube and the current in the light-emitting diode when the light-emitting diode corresponding to the target pixel is at a specified aging degree, and the corresponding relationship between photoelectric characteristics is used to characterize
  • the voltage between the gate and the source of the drive tube is fixed, the corresponding relationship between the voltage between the drain and the source and the current in the light emitting diode.
  • the pre-stored characteristic curve table includes: one or more sets of aging compensation correspondences and one or more sets of optoelectronic characteristic correspondences, each set of aging compensation correspondences corresponds to a different aging degree of the light emitting diode, and each set of optoelectronic characteristics corresponds to The voltage between the gate and the source of the driving tube corresponding to the relationship is different.
  • the device for controlling screen brightness can store one or more groups of discrete points, each group of discrete points corresponds to an aging compensation correspondence; it can also store one or more aging compensation curves, and each group of aging compensation curves corresponds to an aging compensation correspondence; One or more calculation formulas may also be stored, and each calculation formula represents an aging compensation corresponding relationship.
  • the device for controlling screen brightness can store one or more groups of discrete points, each group of discrete points corresponds to a photoelectric characteristic correspondence; it can also store one or more photoelectric characteristic curves, and each group of photoelectric characteristic curves corresponds to a photoelectric characteristic correspondence; One or more calculation formulas may also be stored, and each calculation formula represents a corresponding relationship between photoelectric characteristics.
  • the application processor can accurately and quickly determine the target grayscale value or the reference grayscale value according to the feedback voltage, the aging compensation correspondence relationship, and the photoelectric characteristic correspondence relationship.
  • the AP is specifically configured to determine a target aging compensation corresponding relationship from the pre-stored characteristic curve table according to the feedback voltage, and the target aging compensation corresponding relationship represents the target pixel
  • the corresponding relationship between the voltage between the drain and source of the drive tube and the current of the light-emitting diode when the light-emitting diode corresponding to a point is at the aging degree at the current moment; determined according to the target aging compensation correspondence
  • the first reference point, the current of the light emitting diode corresponding to the first reference point is a theoretical current, and the theoretical current is the current in the light emitting diode when the target pixel point displays the theoretical brightness value, the The theoretical current corresponds to a reference voltage in the target aging compensation correspondence relationship;
  • the target photoelectric characteristic correspondence relationship is determined according to the first reference point, and the theoretical current corresponds to the reference voltage in the target photoelectric characteristic correspondence relationship;
  • the target is determined
  • the application processor can accurately determine the target grayscale value that makes the current in the aging light-emitting diode the theoretical current, and the implementation is simple.
  • the device further includes a first Gamma corrector, a Mura corrector, and a second Gamma corrector; before the obtaining the target grayscale value or the reference grayscale value, the method further includes: The first Gamma corrector determines the initial brightness value corresponding to the target pixel in the current gear of the brightness adjustment according to the first Gamma correction table, and the first Gamma correction table is the display brightness under the current gear Gamma correction relationship between the value and the grayscale value; the Mura corrector performs uniformity compensation Demura on the initial brightness value of the target pixel to obtain the target brightness value; the second Gamma corrector is based on a preset The second Gamma correction table determines the initial grayscale value corresponding to the target brightness value; the second Gamma correction table shows the Gamma correction relationship between the brightness value and the grayscale value under the specified gear of the brightness adjustment , The first Gamma correction table is obtained according to the second Gamma correction table; the digital-to-analog converter controls the target
  • Each brightness adjustment level of the screen corresponds to a different Gamma curve.
  • the Gamma correction relationship is consistent with the different brightness adjustment levels.
  • Curve in theory, it is necessary to measure the screen under each brightness adjustment gear to obtain the Gamma curve corresponding to different gears and store them in the register or memory respectively.
  • the designated gear is a brightness adjustment gear corresponding to the maximum brightness value of the screen.
  • the second gamma correction table can correspond to the Gamma 2.2 curve.
  • the device only stores the Gamma curve (that is, the second gamma correction table) corresponding to the grayscale value of the screen pixel input under the specified gear of a certain brightness adjustment and the displayed brightness value, and calculates based on the curve Input the Gamma curve corresponding to the gray scale value and the display brightness value under the other gears of the brightness adjustment (that is, the first gamma correction table).
  • the device only needs to store one Gamma curve, which can effectively reduce the storage space occupied.
  • the AP is specifically configured to determine the first source voltage of the driving tube at the current moment according to the feedback voltage, and the first source voltage is related to the current aging of the target pixel.
  • the degree is related; the first compensation voltage is obtained according to the difference between the first source voltage and the initial voltage, and the initial voltage is the voltage across the light-emitting diode when the target pixel point displays the target brightness value when the light-emitting diode is not aging; calculate the first The sum of the compensation voltage and the initial drive voltage to obtain the intermediate drive voltage; send the first compensation value corresponding to the intermediate drive voltage to the digital-to-analog converter; the digital-to-analog converter is also used to obtain the intermediate drive voltage according to the first compensation value;
  • the intermediate drive voltage is used to control the target pixel drive circuit; the detection circuit is also used to obtain the target feedback voltage of the target pixel drive circuit driven by the intermediate drive voltage; the AP is specifically used to determine the target feedback voltage and pre-stored characteristics
  • the curve table determines the second compensation
  • the application processor successively determines two gray-scale compensation values, and the burn-in compensation module can successively compensate the brightness of the target pixel twice, with high compensation accuracy.
  • the device further includes: a first gamma corrector, configured to determine the initial grayscale value corresponding to the target brightness value.
  • the device further includes: a Mura corrector for performing uniformity compensation Demura on the target pixel to obtain the target brightness value.
  • the initial driving voltage is also used to control a reference pixel driving circuit so that the brightness displayed by the reference pixel is the target brightness value; the reference brightness value is equal to the target pixel
  • the driving circuit is driven by the initial driving voltage to display the brightness value of the target pixel.
  • burn-in compensation is performed on the reference pixel to make the brightness value displayed by the reference pixel equal to the current value of the target pixel.
  • the brightness value displayed is the same, which can improve the display effect of the screen.
  • an embodiment of the present application provides another device for controlling screen brightness.
  • the device includes: an application processor AP and a display driver integrated circuit DDIC.
  • the DDIC includes a burn-in compensation module and a digital-to-analog converter; AP is used to calculate the aging compensation value according to the feedback voltage of the target pixel and the pre-stored characteristic curve table; the burn-in compensation module is used to obtain the target grayscale value according to the aging compensation value; the digital-to-analog converter , For controlling the display brightness value of the target pixel according to the target grayscale value.
  • the feedback voltage may be the feedback voltage of the target pixel driving circuit of the target pixel.
  • the device for controlling the screen brightness is calculated by the AP according to the feedback voltage and several sets of pre-stored typical characteristic curves.
  • the brightness of the target pixel is adjusted so as to improve the deviation of the brightness value of the target pixel due to aging.
  • the DDIC further includes a detection circuit configured to obtain the feedback voltage, and the feedback voltage is related to the aging degree of the light emitting diode corresponding to the target pixel.
  • the application processor can determine the aging degree of the light-emitting diode according to the feedback voltage, and then compensate the brightness of the target pixel corresponding to the aging light-emitting diode.
  • the burn-in compensation look-up table is used to characterize the correspondence between the aging degree of the light emitting diode corresponding to the pixel point and the gray-scale compensation value.
  • the burn-in compensation module can quickly determine the aging grayscale value based on the burn-in compensation look-up table, which is simple to implement.
  • the detection circuit is specifically configured to obtain the feedback voltage of the target pixel driving circuit of the target pixel point, and the target pixel driving circuit includes the light emitting diode and the driving tube; an application processor AP is used to determine the burn-in compensation look-up table according to the feedback voltage and a pre-stored characteristic curve table, and the characteristic curve table is used to characterize the drain and the drain of the driving tube when the light-emitting diode is at a specified aging degree.
  • the corresponding relationship between the voltage between the sources and the current in the light-emitting diode and is used to characterize that when the voltage between the gate and the source of the drive tube is fixed, the drain and the source Correspondence between the voltage between the poles and the current in the light emitting diode.
  • the pre-stored characteristic curve table may include at least one set of correspondences between the voltage between the drain and the source of the drive tube and the current in the light-emitting diode when the light-emitting diode is at a specified degree of aging.
  • the detection circuit is specifically configured to obtain the feedback voltage of the target pixel drive circuit of the target pixel point
  • the target pixel drive circuit includes a light-emitting diode
  • the feedback voltage is compared with the target pixel.
  • the aging degree of the light emitting diode corresponding to the pixel point is related;
  • the application processor AP is configured to determine the aging compensation value according to the feedback voltage and the pre-stored characteristic curve table, and store the aging compensation value in a memory
  • the characteristic curve table is used to characterize the correspondence between the voltage between the drain and source of the drive tube and the current in the light-emitting diode when the light-emitting diode is at a specified degree of aging, and to characterize the current
  • the burn-in compensation module Specifically used to obtain the aging compensation value from the memory.
  • the application processor can accurately and quickly determine the aging compensation values corresponding to the pixels corresponding to the light-emitting diodes with different aging degrees according to the feedback voltage and the pre-stored characteristic curve table.
  • the AP is specifically configured to determine the first compensation value according to the feedback voltage and the pre-stored characteristic curve table; the digital-to-analog converter is further configured to determine the first compensation value according to the first A compensation value is used to obtain an intermediate drive voltage, and the intermediate drive voltage is used to control the target pixel drive circuit; the AP is specifically used to determine the aging according to the intermediate drive voltage and the pre-stored photoelectric characteristic curve table Compensation value.
  • the application processor successively determines two gray-scale compensation values, and the burn-in compensation module can successively compensate the brightness of the target pixel twice, with high compensation accuracy.
  • the target pixel drive circuit further includes a drive tube
  • the pre-stored characteristic curve table includes: an aging compensation correspondence relationship and a photoelectric characteristic correspondence relationship
  • the aging compensation correspondence relationship is used to characterize all The corresponding relationship between the voltage between the drain and the source of the drive tube and the current in the light-emitting diode when the light-emitting diode corresponding to the target pixel is at a specified aging degree, and the corresponding relationship between photoelectric characteristics is used to characterize
  • the voltage between the gate and the source of the drive tube is fixed, the corresponding relationship between the voltage between the drain and the source and the current in the light emitting diode.
  • the application processor can accurately and quickly determine the aging compensation value according to the feedback voltage, the aging compensation correspondence relationship, and the photoelectric characteristic correspondence relationship.
  • the AP is specifically configured to determine a target aging compensation corresponding relationship from the pre-stored characteristic curve table according to the feedback voltage, and the target aging compensation corresponding relationship represents the target pixel
  • the corresponding relationship between the voltage between the drain and source of the drive tube and the current of the light-emitting diode when the light-emitting diode corresponding to a point is at the aging degree at the current moment; determined according to the target aging compensation correspondence
  • the first reference point, the current of the light emitting diode corresponding to the first reference point is a theoretical current, and the theoretical current is the current in the light emitting diode when the target pixel point displays the theoretical brightness value, the The theoretical current corresponds to a reference voltage in the target aging compensation correspondence relationship;
  • the target photoelectric characteristic correspondence relationship is determined according to the first reference point, and the theoretical current corresponds to the reference voltage in the target photoelectric characteristic correspondence relationship;
  • the target is determined
  • the embodiment of the present application provides another device for controlling the brightness of the screen.
  • the device includes: a first gamma corrector for performing first gamma correction on the screen according to the first gamma correction table, so that The brightness value displayed by the target pixel is the same as the theoretical brightness value of the target pixel in the source image;
  • the first Gamma correction table is the brightness value of the screen and the initial input gray scale under the specified gear of brightness adjustment Gamma correction relationship of the value;
  • Mura corrector which performs Demura on the screen after the first Gamma correction, so that the display brightness of the screen is uniform;
  • the second Gamma corrector is used to perform the correction on the screen according to the second Gamma correction table
  • the screen performs a second Gamma correction, the second Gamma correction table is a Gamma correction table under the current brightness display gear; the second Gamma correction table is obtained according to the first Gamma correction table.
  • the device only stores the Gamma curve corresponding to the grayscale value input by the screen pixel point under the specified gear of the brightness adjustment and the displayed brightness value, and calculates the input grayscale under the other gears of the brightness adjustment based on the curve
  • the Gamma curve corresponding to the value and the display brightness value can effectively reduce the storage space occupied.
  • an embodiment of the present application provides a method for controlling screen brightness, which is applied to a device for controlling screen brightness.
  • the device includes a burn-in compensation module and a digital-to-analog converter.
  • the method includes: When the current display brightness value of the target pixel on the screen is inconsistent with the target brightness value, obtain a target grayscale value or a reference grayscale value, and the target grayscale value is a grayscale value that compensates for the brightness of the target pixel
  • the reference grayscale value is a grayscale value for compensating the brightness of a reference pixel, and the reference pixel is other pixels in the screen except the target pixel; the digital-to-analog converter is based on the The target grayscale value controls the display brightness of the target pixel; or, according to the reference grayscale value, the display brightness of the reference pixel is controlled.
  • the obtaining the target grayscale value or the reference grayscale value includes: the burn-in compensation module causes the current display brightness value to be different from the current display brightness value due to the aging of the light emitting diode corresponding to the target pixel.
  • the target grayscale value or the reference grayscale value is acquired, and the target brightness value is the theoretical brightness value of the target pixel in the input image source; the digital-to-analog converter is based on The target grayscale value controls the display brightness of the target pixel; or, controlling the display brightness of the reference pixel according to the reference grayscale value includes: the digital-to-analog converter controls according to the target grayscale value
  • the display brightness of the target pixel is the target brightness value; or, the display brightness of the reference pixel is controlled to be a reference brightness value according to the reference grayscale value, and the reference brightness value is the same as the current display brightness value Positive correlation.
  • the obtaining the target grayscale value or the reference grayscale value includes: the burn-in compensation module has a light-emitting diode corresponding to the target pixel whose aging degree meets a preset condition
  • the digital-to-analog converter controls the display brightness of the target pixel according to the target grayscale value
  • the burn-in compensation module emits light corresponding to the target pixel
  • the reference grayscale value is acquired, so that the digital-to-analog converter controls the display brightness of the reference pixel according to the reference grayscale value.
  • the acquiring the target grayscale value or the reference grayscale value includes: the burn-in compensation module determines the target grayscale value or the reference grayscale value based on a burn-in compensation lookup table Gray scale value, the burn-in compensation look-up table is used to characterize the correspondence between the aging degree of the light emitting diode corresponding to the pixel and the burn-in compensation value.
  • the device further includes a detection circuit and an application processor AP; before the screen burn compensation module determines the target gray scale value or the reference gray scale value based on the burn screen compensation lookup table, The method further includes: acquiring, by the detection circuit, a feedback voltage of a target pixel driving circuit of the target pixel, the target pixel driving circuit includes the light-emitting diode and a driving tube, the feedback voltage and the target pixel The aging degree of the corresponding light-emitting diode is related; the application processor AP determines the burn-in compensation look-up table according to the feedback voltage and a pre-stored characteristic curve table, and the characteristic curve table is used to indicate that the light-emitting diode is at a specified aging degree The corresponding relationship between the voltage between the drain and source of the drive tube and the current in the light-emitting diode, and is used to characterize when the voltage between the gate and the source of the drive tube is fixed , The corresponding relationship between the voltage between the drain and the
  • the device further includes a detection circuit and an application processor AP; before the obtaining the target grayscale value or the reference grayscale value, the method further includes: the detection circuit obtains the target pixel point
  • the target pixel driving circuit includes a light-emitting diode, and the feedback voltage is related to the aging degree of the light-emitting diode corresponding to the target pixel; the application processor AP is based on the feedback voltage and
  • the pre-stored characteristic curve table determines the target gray scale value or the reference gray scale value, and stores the target gray scale value or the reference gray scale value in a memory, and the characteristic curve table is used to represent all The corresponding relationship between the voltage between the drain and the source of the drive tube and the current in the light-emitting diode when the light-emitting diode is at a specified aging degree, and is used to characterize the relationship between the gate and the source of the drive tube When the voltage between the drain and the source is fixed, the corresponding relationship between the voltage between the drain and the source and
  • the application processor AP determining the target grayscale value or the reference grayscale value according to the feedback voltage and a pre-stored characteristic curve table includes: the AP according to the feedback The voltage and the pre-stored characteristic curve table determine a first compensation value, so that the digital-to-analog converter obtains an intermediate drive voltage according to the first compensation value, and the intermediate drive voltage is used to control the target pixel drive circuit The AP determines the target grayscale value according to the intermediate driving voltage and the pre-stored photoelectric characteristic curve table.
  • the target pixel drive circuit further includes a drive tube
  • the pre-stored characteristic curve table includes: an aging compensation correspondence relationship and a photoelectric characteristic correspondence relationship
  • the aging compensation correspondence relationship is used to characterize all The corresponding relationship between the voltage between the drain and the source of the drive tube and the current in the light-emitting diode when the light-emitting diode corresponding to the target pixel is at a specified aging degree, and the corresponding relationship between photoelectric characteristics is used to characterize
  • the voltage between the gate and the source of the drive tube is fixed, the corresponding relationship between the voltage between the drain and the source and the current in the light emitting diode.
  • the application processor AP determining the target grayscale value or the reference grayscale value according to the feedback voltage and a pre-stored characteristic curve table includes: the AP according to the feedback The voltage determines the target aging compensation correspondence from the pre-stored characteristic curve table, and the target aging compensation correspondence characterizes when the light emitting diode corresponding to the target pixel is at the aging degree of the current moment, the driving tube
  • the device further includes a first Gamma corrector, a Mura corrector, and a second Gamma corrector; before the obtaining the target grayscale value or the reference grayscale value, the method further includes: The first Gamma corrector determines the initial brightness value corresponding to the target pixel in the current gear of the brightness adjustment according to the first Gamma correction table, and the first Gamma correction table is the display brightness under the current gear Gamma correction relationship between the value and the grayscale value; the Mura corrector performs uniformity compensation Demura on the initial brightness value of the target pixel to obtain the target brightness value; the second Gamma corrector is based on a preset The second Gamma correction table determines the initial grayscale value corresponding to the target brightness value; the second Gamma correction table shows the Gamma correction relationship between the brightness value and the grayscale value under the specified gear of the brightness adjustment , The first Gamma correction table is obtained according to the second Gamma correction table; the digital-to-analog converter controls the target
  • the embodiments of the present application provide another method for controlling screen brightness, which is applied to a device for controlling screen brightness.
  • the device includes: an application processor AP and a display driver integrated circuit DDIC.
  • the DDIC includes a burn-in compensation module.
  • a digital-to-analog converter the method includes: the AP calculates an aging compensation value according to the feedback voltage of the target pixel and a pre-stored characteristic curve table; the burn-in compensation module obtains the target grayscale value according to the aging compensation value;
  • the digital-to-analog converter controls the display brightness value of the target pixel according to the target grayscale value.
  • the feedback voltage may be the feedback voltage of the target pixel driving circuit of the target pixel.
  • the DDIC further includes: a detection circuit; before the AP calculates the aging compensation value according to the feedback voltage of the target pixel and a pre-stored characteristic curve table, the method further includes: the detection The circuit obtains the feedback voltage, and the feedback voltage is related to the aging degree of the light emitting diode corresponding to the target pixel.
  • the device further includes an application processor AP; before the AP calculates the aging compensation value according to the feedback voltage of the target pixel and a pre-stored characteristic curve table, the method further includes: AP is used to determine the burn-in compensation look-up table according to the feedback voltage and a pre-stored characteristic curve table, and the characteristic curve table is used to characterize the drain and the drain of the driving tube when the light-emitting diode is at a specified aging degree.
  • AP is used to determine the burn-in compensation look-up table according to the feedback voltage and a pre-stored characteristic curve table, and the characteristic curve table is used to characterize the drain and the drain of the driving tube when the light-emitting diode is at a specified aging degree.
  • the corresponding relationship between the voltage between the sources and the current in the light-emitting diode is used to characterize that when the voltage between the gate and the source of the drive tube is fixed, the drain and the source Correspondence between the voltage between the poles and the current in the light emitting diode.
  • the application processor can accurately and quickly locate the grayscale compensation values corresponding to the pixels corresponding to the light-emitting diodes with different aging degrees according to the feedback voltage and the pre-stored characteristic curve table.
  • the pre-stored characteristic curve table includes: an aging compensation correspondence relationship and a photoelectric characteristic correspondence relationship, and the aging compensation correspondence relationship is used to characterize that the light emitting diode corresponding to the target pixel is in The corresponding relationship between the voltage between the drain and source of the drive tube and the current in the light-emitting diode when the degree of aging is specified, and the corresponding relationship between photoelectric characteristics is used to characterize when the gate and source of the drive tube When the voltage between the drain and the source is fixed, the corresponding relationship between the voltage between the drain and the source and the current in the light emitting diode.
  • the application processor can accurately and quickly determine the target grayscale value according to the feedback voltage, the corresponding relationship between the aging compensation and the corresponding relationship between the photoelectric characteristics.
  • an embodiment of the present application provides a terminal device.
  • the terminal device includes: a Mura corrector, a first Gamma corrector, a digital-to-analog converter, a processor, and a screen; a Mura corrector is used for the screen Demura is performed on the target pixel to obtain the target brightness value corresponding to the target pixel.
  • the target brightness value is the theoretical brightness value of the target pixel in the input image source; the first Gamma corrector is used to determine the target brightness The input gray scale value corresponding to the value; a digital-to-analog converter for obtaining an initial driving voltage according to the input gray scale value, and the initial driving voltage is used to control the target pixel driving circuit so that the brightness of the target pixel display is the target Brightness value; the processor is used to determine the target grayscale value of the aging target pixel when the target pixel is aging, and the brightness displayed by the aging target pixel under the initial driving voltage is not equal to the target brightness Value, the target grayscale value is the grayscale value when the aging target pixel displays the target brightness value.
  • an embodiment of the present application provides a chip, which includes: a burn-in compensation module and a digital-to-analog converter; a burn-in compensation module for displaying the current brightness value of the target pixel on the screen and the target brightness
  • a target grayscale value or a reference grayscale value the target grayscale value is a grayscale value that compensates for the brightness of the target pixel
  • the reference grayscale value is the brightness of the reference pixel
  • the gray scale value for compensation, the reference pixel is other pixels in the screen except the target pixel; a digital-to-analog converter is used to control the target pixel according to the target gray scale value Or, the digital-to-analog converter is used to control the display brightness of the reference pixel according to the reference grayscale value.
  • the present application provides a computer-readable storage medium, the computer storage medium stores a computer program, the computer program includes program instructions, and when the program instructions are executed by a processor, the processor executes the foregoing Operations performed by the application processor in the fourth to fifth aspects and optional implementation manners.
  • this application provides a computer program product containing instructions that, when it runs on a computer or processor, enables the computer or processor to perform the fourth to fifth aspects or any of the possible The method in the implementation.
  • FIG. 1 is a schematic structural diagram of a device for screen brightness provided by an embodiment of the present application
  • FIG. 2 is a schematic structural diagram of another device provided by an embodiment of the application.
  • FIG. 3 is a schematic diagram of a target aging compensation curve and a target photoelectric characteristic curve provided by an embodiment of the application;
  • FIG. 4 is a schematic structural diagram of an aging compensation circuit provided by an embodiment of the application.
  • FIG. 5 is a schematic diagram of a photoelectric characteristic curve and an aging compensation curve provided by an embodiment of the application
  • FIG. 6 is a schematic structural diagram of another aging compensation circuit provided by an embodiment of the application.
  • FIG. 7 is a schematic diagram of another photoelectric characteristic curve and aging compensation curve provided by an embodiment of the application.
  • FIG. 8 is a schematic diagram of another photoelectric characteristic curve and aging compensation curve provided by an embodiment of the application.
  • FIG. 9 is a schematic diagram of pixels of a screen provided by an embodiment of the application.
  • FIG. 10 is a schematic structural diagram of another device provided by an embodiment of the application.
  • FIG. 11 is a schematic structural diagram of yet another aging compensation circuit provided by an embodiment of the application.
  • FIG. 12 is a schematic flowchart of a method for controlling screen brightness according to an embodiment of the present application.
  • FIG. 13 is a schematic structural diagram of a terminal device provided by an embodiment of the present application.
  • the brightness of the image displayed on the screen and the original brightness of the original input image are usually not consistent, but there is a certain deviation.
  • the image output on the screen will be distorted compared to the input image, causing a large difference between the screen display color and the input image, or the screen displaying the image too bright or too dark.
  • the input grayscale value of the screen when the color displayed on the screen changes from black to white, the input grayscale value of the screen also changes, but this change is not linear.
  • the physical characteristics of the screen display determine if the input grayscale value changes linearly Yes, the output brightness value is not linear.
  • the grayscale value input on the screen In order to ensure that the displayed brightness value does not deviate from the brightness value expected on the screen, it is necessary to correct the grayscale value input on the screen, that is, perform the Gamma correction process on the screen to make It shows the desired brightness.
  • performing Gamma correction on the screen can make the change relationship between the grayscale value of the screen input and the brightness of the output meet a corresponding relationship curve, which is the Gamma curve.
  • the screen can display the preset brightness and color.
  • the Gamma curve When using the Gamma curve to correct the screen brightness, when the overall brightness of the screen changes, or the input and output characteristics of individual pixels on the screen change, it will affect the overall display of the screen brightness.
  • the screen brightness needs to be corrected to make it Display normal brightness.
  • it is not only necessary to correct the brightness of the screen, but also to solve the problem of uneven brightness (Mura) of individual pixels on the screen and the screen The aging problem and so on.
  • Mura uneven brightness
  • the screen is an AMOLED screen
  • the luminous characteristics of individual pixels will change due to process reasons (such as the uniformity of evaporation on the entire surface and film thickness control, etc.) during the production process of the AMOLED display panel.
  • process reasons such as the uniformity of evaporation on the entire surface and film thickness control, etc.
  • the driving voltage of individual pixels is the same
  • the current flowing through will appear different in size, which will cause the brightness of individual pixels on the screen to appear uneven (Mura) during display.
  • the screen In order to correct the Mura phenomenon of the screen, the screen also needs to compensate and eliminate the Mura phenomenon, that is, the Demura step. Therefore, a step for eliminating the Mura phenomenon can be added to the brightness control method of the screen.
  • Screens such as OLED are organic polymer materials, which are often prone to aging behaviors such as thermal aging, humidity aging, and light aging. When organic materials age, their physical properties will also change, causing a certain pixel or a certain area on the screen to emit light unevenly or lower its efficiency compared with other surroundings. Therefore, in the brightness control method of the screen, it is also necessary to perform aging compensation (also called burn-in compensation) on the aging pixels in the screen to solve the aging problem of the screen.
  • aging compensation also called burn-in compensation
  • Demura also known as uniformity compensation
  • gamma correction and burn-in compensation all affect each other, and they are all to make the brightness of the image displayed on the screen consistent with the original brightness of the original input image.
  • Demura, Gamma correction and burn-in compensation are not comprehensively considered when adjusting the brightness of the screen, resulting in poor display effect of the screen display brightness. Therefore, it is necessary to study the brightness device and brightness control method that comprehensively consider the Gamma correction, Demura and burn-in compensation of the screen.
  • FIG. 1 is a schematic structural diagram of a screen brightness device provided by an embodiment of the present application. As shown in Fig. 1, the device 10 includes:
  • the burn-in compensation module 104 is configured to obtain a target grayscale value or a reference grayscale value when the current display brightness value of the target pixel on the screen is not consistent with the target brightness value, and the target grayscale value is relative to the target pixel.
  • the grayscale value for compensating the brightness of a point is a grayscale value for compensating the brightness of a reference pixel, and the reference pixel is other than the target pixel in the screen pixel;
  • a digital-to-analog converter (DAC) 103 is used to control the display brightness of the target pixel according to the target grayscale value; or the digital-to-analog converter 103 is used to control the display brightness of the target pixel according to the reference grayscale value Control the display brightness of the reference pixel.
  • DAC digital-to-analog converter
  • the device 10 further includes: a mura corrector 101 for performing Demura on a target pixel in the screen to obtain a target brightness value corresponding to the target pixel, where the target brightness value is the input image of the target pixel The theoretical brightness value in the source.
  • the Mura corrector 101 may use pre-stored Demura data to perform Demura on each pixel in the screen to eliminate the Mura phenomenon in the screen.
  • the first gamma corrector 102 is used to determine the input grayscale value corresponding to the target brightness value.
  • the digital-to-analog converter 103 is also used to obtain an initial driving voltage according to the input grayscale value, and the initial driving voltage is used to control the target pixel driving circuit so that the brightness displayed by the target pixel is the target brightness value.
  • the initial driving voltage is a driving voltage that enables the brightness value of the target pixel to be the target brightness value before the light emitting diode corresponding to the target pixel is not aged. That is, if the light-emitting diode corresponding to the target pixel has not been aged, the brightness value of the target pixel when the driving voltage of the target pixel driving circuit is the initial driving voltage is the target brightness value.
  • the light emitting diode may be AMOLED, OLED, etc.
  • Each brightness adjustment level of the screen corresponds to a different Gamma curve.
  • the Gamma correction relationship is consistent with the different brightness adjustment levels.
  • Curve in theory, the screen needs to be measured at each brightness adjustment gear to obtain the Gamma curve corresponding to different gears and store them in the register or memory respectively, but this approach requires multiple production lines for measurement Measurement, it will also take up a lot of storage space.
  • the gear corresponding to the maximum brightness value that can be displayed on the screen can be selected as the specified gear for brightness adjustment, and the grayscale value and displayed brightness input to the screen under the brightness adjustment gear
  • the Gamma correction relationship of the value is measured to obtain a set of Gamma curves (corresponding to the second gamma correction table), which contains all the brightness values of the screen from the minimum brightness value to the maximum brightness value.
  • the brightness value displayed on the screen will be less than the brightness value under the specified gear of the brightness adjustment, so the brightness value displayed on the screen and the corresponding input grayscale value can still be found in the Gamma curve. Therefore, the Gamma curve under the brightness adjustment gear corresponding to the maximum brightness value can be pre-stored in the memory or register. After the brightness adjustment gear is changed, other brightness adjustment gears can be calculated based on the pre-stored Gamma curve. Input the Gamma curve of the grayscale value and the displayed brightness value (corresponding to the first gamma correction table) to realize the correction of the corresponding relationship between the input grayscale value and the displayed brightness value in other gears.
  • the apparatus 10 further includes:
  • the second gamma corrector 105 is configured to determine the initial brightness value corresponding to the target pixel in the current gear according to the first gamma correction table;
  • the mura corrector 101 is specifically configured to perform Demura on the initial brightness value of the target pixel to obtain the target brightness value;
  • the first gamma corrector 102 is specifically configured to determine the input grayscale value corresponding to the target brightness value according to the second gamma correction table; the second gamma correction table is the brightness value of the screen under the specified gear of brightness adjustment Gamma correction relationship with the initial input grayscale value; the first gamma correction table is obtained according to the second gamma correction table.
  • the first gamma correction table is obtained through a series of calculations based on the second gamma correction table.
  • the correction performed by the first Gamma corrector 102 and the correction performed by the second Gamma corrector 105 make the Gamma correction relationship between the grayscale value input by each pixel on the screen and the displayed brightness value even at different levels of brightness adjustment. Conforms to the Gamma curve.
  • the first gamma corrector 102 performs the first gamma correction on the screen according to the second gamma correction table, so that the brightness value displayed by the target pixel in the screen is the same as the theoretical brightness value of the target pixel in the source image; the Mura corrector 101 Demura is performed on the screen after the first gamma correction, so that the display brightness of the screen is uniform; the second gamma corrector performs the second gamma correction on the screen according to the first gamma correction table.
  • the second gamma correction table is the Gamma correction relationship between the brightness value of the screen and the input grayscale value under the specified gear of brightness adjustment.
  • the designated gear is a brightness adjustment gear corresponding to the maximum brightness value of the screen.
  • the second gamma correction table can correspond to the Gamma 2.2 curve. It can be understood that the input gray scale value and brightness value after correction by the first Gamma corrector 102 conforms to the Gamma 2.2 curve.
  • the Mura corrector 101 can use a fixed Mura compensation table (ie, compensation data) to perform Demura on the screen to make the display brightness of the screen uniform.
  • the function of the mura corrector 101 is to compensate the relationship between the grayscale value and the brightness value of each pixel on the screen, so that the input and output characteristics of each pixel on the screen are kept consistent, thereby eliminating the Mura phenomenon that may exist on the screen.
  • the Mura corrector 101 performs Demura on the screen, the input and output characteristics of each pixel on the screen are consistent.
  • the Mura corrector 101 it can be considered that the input and output characteristics of each pixel in the screen are consistent and the Mura corrector 101 does not exist. It can be understood that the Mura corrector 101 adjusts the input and output characteristics of each pixel on the screen, and has no effect on brightness adjustment.
  • the first gamma correction table is a gamma correction table under the current brightness display gear (corresponding to the Gamma curve of the current gear); the first gamma correction table is obtained according to the second gamma correction table.
  • the first Gamma corrector 102 will obtain the Gamma curve in the current gear. That is, every time the device 10 adjusts the gear position, it will obtain a first gamma correction table according to the second gamma correction table.
  • the second gamma correction table is fixed, and the device stores a new first gamma correction table every time the gear is adjusted.
  • the device 10 only needs to store the second gamma correction table and obtain the first gamma correction table according to the currently adjusted gear, instead of storing the gamma correction tables in each gear, which greatly reduces the storage space occupied.
  • the operations performed by the first gamma corrector 102 and the second gamma corrector 105 make the input gray scale value and the displayed brightness value of each pixel in the current gear conform to the Gamma curve.
  • the purpose of arranging two Gamma correctors in the device 10 is to reduce the storage space occupied.
  • the operations performed by the first Gamma corrector 102 and the second Gamma corrector 105 make the input gray scale value and the displayed brightness value of each pixel in the current gear conform to the Gamma curve; Mura corrector 101 keeps the input and output characteristics of each pixel on the screen consistent. It can be understood that the input gray scale value processed by the second Gamma corrector 105, the Mura corrector 101, and the first Gamma corrector 102 is such that the target pixel before aging displays the target brightness value, and the input gray The order value and the target brightness value conform to the Gamma curve.
  • the second gamma corrector 105 can determine the initial brightness value (that is, the brightness value of each pixel to be displayed) corresponding to each pixel on the screen in the current gear according to the first gamma correction table; the Mura corrector 101 can Perform Demura on each pixel to obtain the brightness value of each pixel after uniformity compensation, which can eliminate the Mura phenomenon in the screen; the first Gamma corrector 102 can determine the difference with each pixel based on the preset second Gamma correction table
  • the brightness value corresponds to the input grayscale value; the digital-to-analog converter 103 converts the input grayscale value into a driving voltage, which is the voltage provided to the pixel driving circuit corresponding to each pixel.
  • the pixel When the driving voltage changes, the pixel The display brightness of the dot will also change, so the display brightness of each pixel can be adjusted by changing the input grayscale value; the burn-in compensation module 104 obtains the compensation grayscale value corresponding to each pixel, and the digital-to-analog converter 103 converts each pixel The corresponding compensated grayscale value is converted into a corresponding driving voltage, and thus the brightness adjustment of each aging pixel point is realized.
  • the processing operation can make the brightness of the image displayed on the screen consistent with the theoretical brightness of the original input image (ie, the image source).
  • the device 10 uses the screen after Demura as the compensation reference point for burn-in compensation, uses the burn-in compensation module 104 to obtain the compensation grayscale value corresponding to the aging degree of each pixel, and the digital-to-analog converter 103 converts the compensation grayscale value It is the driving voltage of each pixel driving circuit to control the brightness value of each pixel to be consistent with the brightness value of each pixel when it is not aging, so as to achieve aging compensation.
  • the division of the various modules of the device shown in FIG. 1 is only a division of logical functions, and may be fully or partially integrated into one physical entity during actual implementation, or may be physically separated. And these modules can all be implemented in the form of software called by processing elements; they can also be implemented in the form of hardware; some modules can also be implemented in the form of software called by processing elements, and some of the modules can be implemented in the form of hardware.
  • the first Gamma corrector 102 can be a separately established processing element, or it can be integrated into a certain chip of the device for implementation.
  • it can also be stored in the memory of the device in the form of a program, which is controlled by a certain device of the device.
  • a processing element calls and executes the function of the first Gamma corrector 102.
  • the implementation of other modules is similar.
  • all or part of these modules can be integrated together or implemented independently.
  • the processing element here can be an integrated circuit with signal processing capability.
  • each step of the above method or each of the above units can be completed by an integrated logic circuit of hardware in the processor element or instructions in the form of software.
  • the device for screen brightness provided in the embodiments of the present application considers Demura, Gamma correction, and burn-in compensation, which can effectively eliminate Mura phenomenon, solve the aging problem of the screen, and realize Gamma correction on the brightness of the screen display, so that the screen displays
  • the brightness of the image is consistent with the original brightness of the original input image.
  • the following describes how the second Gamma corrector 105 determines the initial brightness value corresponding to the target pixel on the screen in the current gear.
  • the screen may have multiple different gears for adjusting brightness.
  • the range of brightness values that can be displayed on the screen under different brightness adjustment gears is different.
  • the maximum brightness value that the screen itself can display is 500 nits. If the screen has 5 different brightness adjustment gears, the first brightness adjustment gear, the lower screen can display the brightness value range of 0 -100nit, the range of the brightness value that can be displayed on the screen under the second brightness adjustment gear is 0-200nit,..., the range of the brightness value that can be displayed on the screen under the fifth brightness adjustment gear is 0-500nit,
  • the 5 brightness adjustment levels of the screen can correspond to the 5 scales on the brightness bar of the screen.
  • the rightmost scale on the screen brightness bar corresponds to the fifth brightness adjustment level, which is shifted by one to the left
  • the scale corresponds to the fourth brightness adjustment gear
  • the leftmost scale on the screen brightness bar corresponds to the first brightness adjustment gear (that is, the display brightness range is the smallest and the screen brightness is also the darkest).
  • the display brightness range is the smallest and the screen brightness is also the darkest.
  • the brightness value corresponding to the area with the same brightness will also change accordingly. It should be understood that the above-mentioned data is only an example of the brightness adjustment gear of the screen, and does not limit the brightness adjustment gear of the screen and the corresponding displayable brightness value range.
  • the pixels on the screen will still remain the same The ratio of light to dark, so that the entire display image can maintain the original texture and pattern features when the reference brightness value changes.
  • the brightness adjustment gear of the screen changes, the brightness value displayed by each pixel in the gear will also change along with the change of the gear.
  • there is a positive correlation between the brightness adjustment gear of the screen and the brightness value displayed by each pixel so that the image can be adjusted as a whole without damaging the image itself. And textures and other details.
  • the initial brightness value corresponding to each pixel of the screen in the current gear can be determined.
  • the device 10 may store the corresponding relationship between the grayscale value and the brightness value in at least one gear, and may determine the grayscale value and the brightness in other gears according to the corresponding relationship between the grayscale value and the brightness value in the gear Correspondence between the values; the second Gamma corrector 105 can determine the grayscale value of each pixel in the input image in the current gear according to the corresponding relationship between the grayscale value and the brightness value under the current gear (ie the first gamma correction table) Under the corresponding brightness value.
  • the mura corrector Since the mura corrector has nothing to do with brightness adjustment, and the first gamma corrector uses the gamma correction table under the specified gear, that is, the fixed gamma correction table.
  • the mura compensation table in the mura corrector When the display brightness of the screen is brightened or dimmed, there is no need to change the mura compensation table in the mura corrector and the second gamma correction table corresponding to the first gamma corrector. You only need to change the grayscale value of the second gamma corrector 105 and The corresponding relationship of the brightness value is the first gamma correction table.
  • each pixel on the screen Since each pixel on the screen is independent of each other, the brightness value of each pixel is also independent of each other, and will only change with the change of the brightness adjustment gear of the screen. Therefore, when the screen is in a certain brightness adjustment gear, such as the current brightness adjustment gear, each pixel on the screen will have an independent initial brightness value, and when the screen displays different images, each pixel will display The brightness value of can be the same or different. Specifically, when the same image is displayed, if the brightness adjustment gear of the screen is adjusted, the brightness value displayed when the grayscale value input on the screen is the largest can be determined first, and determined according to the specific ratio or other positive correlation. Each pixel is the display brightness value adjusted to display other grayscale values.
  • the initial brightness value displayed by each pixel can be positively correlated with the brightness adjustment gear of the screen, that is, the initial brightness value will change in the same direction as the display brightness adjustment gear of the screen changes.
  • the initial brightness value of each pixel becomes larger accordingly; and when the brightness of the screen is adjusted from that of the brighter image
  • the initial brightness value of each pixel will be correspondingly smaller.
  • the second Gamma corrector 105 can more accurately determine the brightness value of each pixel on the screen at the current gear, that is, the brightness value of each pixel to be displayed.
  • the following describes how the Mura corrector 101 performs Demura on the target pixel to obtain the target brightness value corresponding to the target pixel.
  • the mura compensation also called Demura may be based on the brightness value of each pixel determined by the second Gamma corrector 105. Among them, there are many types of mura compensation methods, such as internal compensation or external compensation.
  • the register (or memory) associated with the mura corrector 101 may store at least one mura compensation table (ie, Demura data), and each mura compensation table is used to indicate the corresponding brightness compensation value when the grayscale value of each pixel on the screen is the same.
  • each grayscale value corresponds to a mura compensation table
  • the mura corrector 101 can store a mura compensation table corresponding to each grayscale value; it can also store a mura compensation table corresponding to a part of the grayscale value, and according to this part of the grayscale value.
  • the mura compensation table corresponding to the level value determines the mura compensation table corresponding to each gray level value.
  • the screen when the screen is an 8-bit (8-bit) grayscale input, the screen can display a total of 256 grayscale values in the range of 0-255.
  • the associated register of the Mura corrector 101 can store 10 different grayscales.
  • the mura corrector 101 can obtain the mura compensation table corresponding to the other 246 gray-scale values by means of interpolation.
  • the mura corrector 101 can perform Demura on each pixel in the screen in the same manner.
  • the Mura corrector 101 can obtain the grayscale value corresponding to the brightness value (initial brightness value) of the target pixel to be displayed, and obtain the grayscale value in the mura compensation table corresponding to the grayscale value.
  • the brightness compensation value the sum of the initial brightness value and the brightness compensation value is used as the target brightness value, that is, the brightness value after mura compensation.
  • the Demura data (also known as compensation data) can be determined in the following way: provide a driving voltage corresponding to a certain gray scale value to the pixel driving circuit corresponding to each pixel on the screen, and use high-power cameras and other equipment to monitor the screen. Take a shot to obtain the actual brightness value of each pixel on the screen. If the screen has a Mura phenomenon, the brightness of the pixels in the area where the Mura phenomenon occurs will be different from the brightness of the pixels outside the area. In this way, the data captured by the camera can be analyzed to obtain compensation data, such as a Mura compensation table.
  • the compensation data may include the coordinates of the pixel to be compensated in the screen and the brightness compensation value corresponding to each pixel to be compensated.
  • the Mura compensation table may include brightness compensation data of each pixel on the screen, and the compensation data of pixels that do not need to be compensated for normal brightness display is 0.
  • the mura corrector 101 can be used to perform Demura on each pixel on the screen to adjust the brightness value of each pixel.
  • the Mura corrector 101 can use prestored Demura data to perform Demura on each pixel to eliminate the Mura phenomenon on the screen. In this way, after the Demura step, the Mura phenomenon of the screen can be compensated, so that each pixel of the screen has a uniform brightness.
  • the following describes how the first Gamma corrector 102 determines the input grayscale value corresponding to the target brightness value based on the preset second Gamma correction table.
  • the preset second Gamma correction table represents the correspondence between the output brightness value displayed on the screen and the input grayscale value of the screen.
  • the gray scale value is converted into an analog signal through the DAC103 to control the driving voltage and further control the display brightness value of the pixel, so that an image is normally displayed on the screen.
  • the screen is displayed, due to the sensitivity of the human eye or the photoelectric characteristics of the screen itself, there will be distortions between the image output on the screen and the input image, for example, the color difference between the screen display and the input image is large. Or there is a difference between the brightness of the screen display and the original brightness of the input image.
  • the voltage input on the screen can be corrected to make the brightness value of the image displayed on the screen equal to or have a linear relationship with the brightness value of the image actually input.
  • the Gamma correction relationship between the brightness value displayed by any pixel on the screen and the input grayscale value can be continuous or discrete.
  • the corresponding relationship between the brightness value displayed by any pixel and the input grayscale value will follow the same response curve, that is, the Gamma curve.
  • the Gamma curve can be used to indicate the correspondence between the brightness value displayed by the pixel and the input grayscale value under the gear, thereby forming a Gamma correction relationship between the brightness value and the input grayscale value .
  • the abscissa of the Gamma curve may represent the input gray scale value
  • the ordinate of the Gamma curve may represent the displayed brightness value.
  • the second Gamma correction table may include multiple discrete grayscale values and multiple display brightness values, the number of grayscale values is equal to the number of display brightness values, and the grayscale values correspond to the display brightness values one-to-one, discrete The number of grayscale values is equal to the total number of grayscale values of the screen.
  • the second Gamma correction table may also include multiple discrete grayscale values and multiple display brightness values. The number of grayscale values is equal to the number of display brightness values, and the grayscale values correspond to the display brightness values one-to-one. The number of gradation values is less than the total number of gradation values of the screen.
  • the two-dimensional coordinate points formed by the display brightness value corresponding to any one of the discrete grayscale values and the discrete grayscale values are located on a Gamma curve, where the abscissa of the Gamma curve represents the grayscale value.
  • the ordinate of the Gamma curve represents the display brightness value.
  • the screen satisfies a preset condition between the current brightness value in the current gear and the previous brightness value of the previous gear adjusted by the brightness, where the current brightness value corresponds to the same input grayscale value as the previous brightness value.
  • the condition is: the ratio of the brightness value difference between adjacent gears to the previous brightness value satisfies Weber's law.
  • the brightness value difference is the difference between the current brightness value and the previous brightness value.
  • the correspondence between multiple grayscale values and multiple display brightness values in the second Gamma correction table conforms to the Gamma correction formula, where the display brightness value is the input of the Gamma correction formula, and the grayscale value is the value of the Gamma correction formula Output.
  • the first Gamma corrector 102 is also used to first obtain the closest target brightness value in the second Gamma correction table. Display brightness value; and then use the grayscale value corresponding to the display brightness value closest to the target brightness value as the input grayscale value corresponding to the target brightness value.
  • the first Gamma corrector 102 is specifically configured to first determine the current gear for the brightness adjustment based on the second Gamma correction table.
  • the target brightness value under the target brightness value is directly adjacent to the two display brightness values; then a linear interpolation equation is established based on the two directly adjacent display brightness values and their corresponding grayscale values; finally, the current value adjusted according to the linear interpolation equation and brightness Obtain the input grayscale value corresponding to the target brightness value under the target brightness value of the gear.
  • the following describes how the digital-to-analog converter 103 obtains the initial driving voltage according to the input gray scale value.
  • the initial driving voltage is a driving voltage that enables the brightness value of the target pixel to be the target brightness value before the light emitting diode corresponding to the target pixel is not aged. That is, if the light-emitting diode corresponding to the target pixel has not been aged, the brightness value of the target pixel when the driving voltage of the target pixel driving circuit is the initial driving voltage is the target brightness value.
  • the unaging of the light emitting diode means that the object characteristics of the light emitting diode have not changed, that is, the object parameters of the light emitting diode have not changed, such as resistance.
  • the driving voltage of a pixel driving circuit of a light-emitting diode is 11V
  • the voltage across the light-emitting diode is 1V before the light-emitting diode is aged.
  • the voltage across the light-emitting diode gradually changes, for example, after a period of After time, the voltage across it becomes 2V.
  • the digital-to-analog converter 103 can be used to generate a corresponding driving voltage according to the input gray scale value.
  • the input grayscale value is usually a digital signal
  • a digital-to-analog converter is used to convert the input grayscale value into an analog driving voltage, so that each pixel drive circuit can be used Under the action of the driving voltage, each pixel on the screen displays the corresponding brightness value.
  • the digital-to-analog converter can change the input gray-scale value into the actual driving voltage after receiving the input gray-scale value in the form of a digital signal.
  • the device 10 may store the corresponding relationship between the input gray scale value and the driving voltage; the digital-to-analog converter 103 may use the corresponding relationship to generate the driving voltage corresponding to each input gray scale value.
  • the screen is an 8-bit (8bit) grayscale input
  • the screen can display a total of 256 grayscale values of any integer in the range of 0-255, and the digital-to-analog converter 103 can generate any grayscale value corresponding
  • the driving voltage is provided to the pixel driving circuit.
  • each gray scale value corresponds to a driving voltage
  • the driving voltage provided by the digital-to-analog converter 103 has a range, that is, all are in a target interval, for example, an interval greater than 2V and less than 12V.
  • the following describes how the burn-in compensation module 104 obtains a target grayscale value or a reference grayscale value when the brightness value displayed by the target pixel at the current moment is inconsistent with the target brightness value.
  • the brightness displayed by the unaging target pixel under the initial driving voltage is equal to the target brightness value; the brightness displayed by the aged target pixel under the initial driving voltage is not equal to the target brightness value.
  • the target grayscale value is the grayscale value when the aging target pixel point displays the target brightness value. Since the light-emitting diode corresponding to the target pixel is aging (that is, the target pixel is aging), the burn-in compensation module 104 needs to obtain the aging compensation data required to make the brightness of the target pixel value the target brightness value (that is, the target gray Order value).
  • the burn-in compensation module 104 compensates for the aging pixels, so that the actual brightness values of the aging pixels are the same as the theoretical brightness values corresponding to the aging pixels in the image source. For pixels that have not been aged, the burn-in compensation module 104 does not perform burn-in compensation for these pixels (ie, burn-in compensation). However, the burn-in compensation module 104 has a limited aging compensation capability. The burn-in compensation module 104 performs burn-in compensation for pixels with a serious degree of aging, and may not be able to make the brightness value of these pixels actually displayed in the image. The corresponding theoretical brightness values in the source are the same.
  • the reason for the limited aging compensation capability of the burn-in compensation module 104 is that the digital-to-analog converter 103 can only convert the input grayscale value that is less than the limit grayscale value into a driving voltage.
  • the burn-in compensation module 104 performs burn-in compensation for the pixel, which cannot make the pixel actually display the brightness
  • the value is the same as the theoretical brightness value of the pixel in the image source.
  • the limit gray scale value is positively related to the maximum gray scale value that can be displayed on the screen.
  • the grayscale value that the screen can display is 0-255
  • the limit grayscale value can be 255, 256, 257, 258, etc.
  • the physical characteristics of the light-emitting diode corresponding to the pixel will change, such as the current flowing through the light-emitting diode, the voltage across the light-emitting diode, the source voltage or the drain of the pixel driving circuit where the light-emitting diode is located.
  • the pole voltage, etc. will vary.
  • the brightness value displayed by the LED will also vary with the degree of aging, and the aging degree of the LED is different at different times.
  • the aging degree of the LED can be It is characterized by the current flowing through the LED and the voltage across the LED.
  • the burn-in compensation module 104 is specifically configured to determine the target gray scale value or the reference gray-scale value based on a burn-in compensation look-up table, and the burn-in compensation look-up table is used to characterize the aging degree of the LED corresponding to the pixel point and Correspondence of gray scale compensation value.
  • the burn-in compensation module 104 is specifically configured to obtain the target grayscale value when the aging degree of the light emitting diode corresponding to the target pixel meets a preset condition, so that the digital-to-analog converter is
  • the target grayscale value controls the display brightness of the target pixel; when the aging degree of the light-emitting diode corresponding to the target pixel does not meet a preset condition, the reference grayscale value is acquired to enable the digital-to-analog conversion
  • the device controls the display brightness of the reference pixel according to the reference grayscale value.
  • the preset condition may be that the target grayscale value is not greater than the limit grayscale value.
  • the burn-in compensation module 104 can send the target grayscale value to the digital-to-analog converter 103 when the target grayscale value is not greater than the limit grayscale value; the digital-to-analog converter 103 controls the target according to the target grayscale value The display brightness of the pixel.
  • the burn-in compensation module 104 can obtain the reference gray level value of the reference pixel when the target gray level value is greater than the limit gray level value, and send the reference gray level value to the digital-to-analog converter 103; the digital-to-analog converter 103 The display brightness of the reference pixel is controlled according to the reference grayscale value.
  • the burn-in compensation module 104 when the burn-in compensation module 104 performs burn-in compensation on the target pixel that cannot make the target pixel display the target brightness value, it performs burn-in compensation on the pixels on the screen other than the target pixel.
  • the burn-in compensation module 104 performs burn-in compensation on the target pixel and cannot make the target pixel
  • the burn-in compensation module 104 performs burn-in compensation on the pixels on the screen except the aging target pixel, so that the brightness value displayed by each pixel on the screen is different from that in the image source.
  • the corresponding theoretical brightness values are all reduced by 5%.
  • an embodiment of the present application provides a schematic structural diagram of another device, as shown in FIG. 2.
  • the device in FIG. 2 adds a screen 201, a detection circuit 202, and an application processor (AP) 203 on the basis of FIG.
  • AP application processor
  • each pixel on the screen 201 can display a corresponding brightness value under the control of the digital-to-analog converter 103, for example, the target pixel displays the target brightness value.
  • the detection circuit 202 is configured to obtain the feedback voltage of the target pixel driving circuit of the target pixel.
  • the target pixel driving circuit includes the light emitting diode and the driving tube, and the feedback voltage is the same as the The aging degree of the light emitting diode corresponding to the target pixel is related;
  • the application processor 203 is configured to determine the burn-in compensation look-up table according to the feedback voltage and a pre-stored characteristic curve table, and the characteristic curve table is used to characterize the driving tube when the light-emitting diode is at a specified aging degree.
  • the corresponding relationship between the voltage between the drain and the source and the current in the light-emitting diode and is used to characterize when the voltage between the gate and the source of the drive tube is fixed, the drain and The corresponding relationship between the voltage between the sources and the current in the light emitting diode.
  • the pre-stored characteristic curve table includes: aging compensation correspondence and photoelectric characteristic correspondence, and the aging compensation correspondence is used to characterize the performance of the drive tube when the light emitting diode corresponding to the target pixel is at a specified aging degree.
  • the corresponding relationship between the voltage between the drain and the source and the current in the light-emitting diode, and the corresponding relationship between the photoelectric characteristics is used to characterize when the voltage between the gate and the source of the drive tube is fixed, The corresponding relationship between the voltage between the drain and the source and the current in the light emitting diode.
  • the detection circuit 202 is configured to obtain the feedback voltage of the target pixel driving circuit of the target pixel.
  • the target pixel driving circuit includes a light emitting diode, and the feedback voltage is the same as that of the target pixel.
  • the aging degree of the light-emitting diode corresponds to the aging degree of the light-emitting diode;
  • the application processor 203 is configured to determine the target grayscale value or the reference grayscale value according to the feedback voltage and a pre-stored characteristic curve table, and store the target grayscale value or the reference grayscale value
  • the characteristic curve table is used to characterize the correspondence between the voltage between the drain and the source of the drive tube and the current in the light-emitting diode when the light-emitting diode is at a specified degree of aging, and for Characterize the correspondence between the voltage between the drain and the source and the current in the light emitting diode when the voltage between the gate and the source of the drive tube is fixed;
  • the burn-in compensation module 104 is specifically configured to obtain the target grayscale value or the reference grayscale value from the memory.
  • the application processor 203 may successively determine two compensation grayscale values, so as to obtain the target grayscale value that causes the target pixel to display the target brightness value.
  • the application processor 203 is specifically configured to determine a first compensation value according to the feedback voltage and the pre-stored characteristic curve table; the digital-to-analog converter 103 is also configured to obtain an intermediate drive according to the first compensation value
  • the intermediate driving voltage is used to control the target pixel driving circuit; the application processor 203 is specifically configured to determine the target grayscale value according to the intermediate driving voltage and the pre-stored photoelectric characteristic curve table.
  • the burn-in compensation module 104 can perform burn-in compensation once or multiple burn-in compensations for the aged pixels, so that the actual brightness value displayed by the aged pixel is the same as the theoretical brightness value corresponding to the image source.
  • the manner in which the application processor 203 determines the target grayscale value according to the feedback voltage and the pre-stored characteristic curve table will be described in detail below.
  • the application processor 203 is specifically configured to determine a target aging compensation corresponding relationship from the pre-stored characteristic curve table according to the feedback voltage, and the target aging compensation corresponding relationship represents the target pixel
  • the corresponding relationship between the voltage between the drain and the source of the drive tube and the current of the light emitting diode when the light emitting diode corresponding to the point is at the aging degree of the current moment;
  • the first reference point is determined according to the target aging compensation correspondence, the current of the light emitting diode corresponding to the first reference point is the theoretical current, and the theoretical current is the theoretical current when the target pixel points display the theoretical brightness value.
  • the current in the light-emitting diode, and the theoretical current in the target aging compensation correspondence relationship corresponds to a reference voltage;
  • the target grayscale value at the current moment is determined according to the first target voltage.
  • FIG. 3 is a schematic diagram of a target aging compensation curve and a target photoelectric characteristic curve provided by an embodiment of the application.
  • 301 is the target aging compensation curve
  • 302 is the target photoelectric characteristic curve
  • Y represents the first reference point.
  • the application processor 203 can first determine the target aging compensation curve 301 according to the feedback voltage; then, determine the first reference point Y corresponding to the theoretical current in the target aging compensation curve; determine the target photoelectric characteristic curve 302 according to the first reference point Y, and The voltage between the drain and the source of the first driving tube corresponding to the target photoelectric characteristic curve 302 is used as the first target voltage; the burn-in compensation driving voltage at the first moment is determined according to the first target voltage, and the burn-in compensation driving voltage is determined according to the burn-in The compensation driving voltage determines the target gray scale value.
  • the method of determining the target aging compensation curve according to the feedback voltage and the method of determining the screen burn-in compensation driving voltage at the first moment according to the first target voltage will be detailed later, which will not be described in detail here.
  • Each pixel in the screen 201 corresponds to a pixel driving circuit, and each pixel corresponds to a light emitting diode.
  • pixel drive circuits there are a variety of pixel drive circuits.
  • the pixel drive circuit corresponding to the pixel point is different, and the way the application processor 203 determines the target grayscale value is also different.
  • the following uses two pixel driving circuits as examples to introduce how the application processor 203 obtains the burn-in compensation driving voltage according to the feedback voltage.
  • a pixel driving circuit is taken as an example to illustrate how the application processor 203 determines the burn-in compensation driving voltage.
  • 4 is a schematic structural diagram of an aging compensation circuit provided by an embodiment of the application.
  • the aging compensation circuit is a part of the device 10 related to burn-in compensation.
  • the target pixel driving circuit in FIG. 4 is a pixel driving circuit corresponding to the target pixel in the screen.
  • the target pixel driving circuit includes a first driving tube 401 and a first light emitting diode 402 corresponding to the target pixel.
  • the initial driving voltage provided by the digital-to-analog converter 103 is the input voltage of the gate of the first driving tube 401.
  • the drain of the first driving tube 401 inputs a fixed voltage (for example, the power supply voltage V DD ), the source of the first driving tube 401 is connected to one end of the first light emitting diode 402, and the other end of the first light emitting diode 402 is grounded or a negative voltage .
  • the first driving tube 401 may be an N-type thin film field effect transistor (Thin Film Transistor, TFT), also called an N-type TFT driving transistor.
  • TFT Thin Film Transistor
  • the target pixel drive circuit in Figure 4 is a simplified pixel drive circuit. In practical applications, the pixel drive circuit may also include storage capacitors and other devices.
  • the application processor 203 can determine the voltage of the source of the first driving tube (ie, the source voltage) according to the feedback voltage of the target pixel driving circuit.
  • V D represents the drain voltage
  • V S represents the source voltage
  • V G represents the gate voltage
  • I DS represents the current in the first light emitting diode 402. Since the driving voltage of the gate of the first driving tube 401 is the initial driving voltage, the drain of the first driving tube 401 is a fixed voltage. After the application processor 203 obtains the feedback voltage of the target pixel driving circuit, the source voltage V S , the gate voltage V G , and the drain voltage V D of the first driving tube can be determined, so that the first driving tube can be determined The drain-source voltage V DS between the drain and source of 401, and the gate-source voltage V GS between the gate and source of the first driving tube 401.
  • V DS is the difference between the drain voltage V D and the source voltage V S
  • the gate-source voltage V GS is the difference between the gate voltage V G and the source voltage V S.
  • the application processor 203 may determine a target grayscale value, and the target grayscale value compensates the initial driving voltage to the burn-in compensation driving voltage, specifically as follows:
  • the application processor 203 is specifically configured to determine the first source voltage V S (that is, the voltage of the source of the first driving tube 401) of the first driving tube 401 at the first moment (that is, the current moment) according to the feedback voltage.
  • a source voltage is related to the current aging degree of the target pixel;
  • the first source voltage V S is the sum of the feedback voltage and the voltage connected to one end of the first light emitting diode 402, and one end of the first light emitting diode 402 is connected Known fixed voltage;
  • the first gate-source voltage V GS of the first driving tube 401 at the first moment and the first photoelectric characteristic curve corresponding to the first V GS are determined, and the photoelectric characteristic curve is used to characterize when the first When the gate-source voltage V GS of the driving tube is fixed, the corresponding relationship between the voltage V DS between the drain and the source of the first driving tube and the current I DS of the first light-emitting diode;
  • the drain of the first driving tube 401 is a known fixed voltage
  • a first aging compensation curve is determined according to the first aging point, the first aging compensation curve is related to the aging degree of the target pixel at the first moment, and the first aging compensation curve indicates that the target pixel is at the first moment.
  • the theoretical I DS determining a first reference point in the first aging compensation curve, the theoretical IDS current of the first target pixel display light emitting diode when the theoretical value for the brightness
  • V GS corresponding to the second photoelectric characteristic curve is the first target voltage
  • the burn-in compensation driving voltage at the first moment is determined.
  • FIG. 5 is a schematic diagram of a photoelectric characteristic curve and an aging compensation curve provided by an embodiment of the application.
  • 501 is the initial aging compensation curve, that is, the corresponding curve of V DS and I DS when the first light-emitting diode is not aged
  • 502 is the corresponding curve of V DS and I DS after the first light-emitting diode has been aged for a period of time. That is, the first aging compensation curve
  • 503 to 506 are the corresponding curves of V DS and I DS when V GS is 10.3V, 10V, 9V and 8V, that is, the photoelectric characteristic curve.
  • 501 is the corresponding curve of V DS and I DS before the first light-emitting diode is not aged; 502 is the corresponding curve of V DS and I DS after the first light-emitting diode has been aged for a period of time, that is, the current V DS and I DS Corresponding to the curve.
  • V DD 15V
  • V G 11V
  • the current I DS before aging is the position of point A in Figure 5
  • V S changes from 1V Is 2V
  • I DS is changed to the position B I DS point position
  • current I DS becomes smaller, because the brightness is proportional to the current size of the first light emitting diode, the first LED dimming.
  • V G is the driving voltage generated by the digital-to-analog converter according to the grayscale value of the pixel point
  • V G can be changed. Therefore, the input gray scale value sent to the digital-to-analog converter can be adjusted to adjust the driving voltage of the pixel, and the current flowing through the pixel can be adjusted by changing the driving voltage.
  • the current flowing through the pixel is related to the display of the pixel. Brightness is positively correlated.
  • the operations performed by the application processor 203 include: first determining the position of point B (ie, the first aging point) in the first photoelectric characteristic curve (505 in FIG. 5), and then determining the first Aging compensation curve (502 in Figure 5), then determine the position of point D in the first aging curve (ie, the first reference point), and then determine the second photoelectric characteristic curve (503 in Figure 5) according to the position of point D, Finally, determine the burn-in compensation drive voltage.
  • the application processor 203 quickly and accurately determines the burn-in compensation driving voltage according to the feedback voltage, so as to adjust the brightness value of the target pixel to the target brightness value, and the operation is simple.
  • the application processor 203 may first determine the first compensation value, which compensates the initial driving voltage to the intermediate driving voltage; and then determines the second compensation value, which will be the middle The driving voltage is compensated to the second driving voltage, and the specific implementation is as follows:
  • the application processor 203 is specifically configured to determine the first source voltage V S (that is, the voltage of the source of the first driving tube 401) of the first driving tube 401 at the first moment (that is, the current moment) according to the feedback voltage.
  • a source voltage is related to the current aging degree of the target pixel;
  • the first source voltage V S is the sum of the feedback voltage and the voltage connected to one end of the first light emitting diode 402, and one end of the first light emitting diode 402 is connected Known fixed voltage;
  • the first compensation voltage is obtained.
  • the initial voltage is the voltage across the first light emitting diode 402 when the target pixel point displays the target brightness value when the first light emitting diode 402 is not aged.
  • Any driving voltage of the circuit corresponds to the voltage across the first light emitting diode 402; calculate the sum of the first compensation voltage and the initial driving voltage to obtain the intermediate driving voltage; send the first corresponding to the intermediate driving voltage to the digital-to-analog converter 103 Compensation value
  • the digital-to-analog converter 103 is also used to obtain an intermediate drive voltage according to the first compensation value; the intermediate drive voltage is used to control the target pixel drive circuit;
  • the detection circuit 202 is also used to obtain the target feedback voltage of the target pixel driving circuit driven by the intermediate driving voltage;
  • the application processor 203 is specifically configured to determine the burn-in compensation driving voltage according to the target feedback voltage
  • the burn-in compensation module 104 is configured to obtain a second compensation value according to the burn-in compensation driving voltage, and send the second compensation value to the digital-to-analog converter 103.
  • the digital-to-analog converter 103 is also used to obtain a burn-in compensation drive voltage according to the second compensation value; the burn-in compensation drive voltage is used to control the target pixel drive circuit so that the brightness value displayed by the aging target pixel point is the target brightness value .
  • the memory associated with the application processor 203 may store any driving voltage of the target pixel driving circuit corresponding to a voltage across the first light emitting diode 402. For example, when the driving voltage of the target pixel driving circuit is 11V, the voltage across the corresponding first light emitting diode 402 is 1V. In other words, the memory associated with the application processor 203 can store the corresponding relationship between V G and V S before aging.
  • the manner in which the application processor 203 determines the burn-in compensation driving voltage according to the target feedback voltage is the same as the manner in which the screen burn-in compensation driving voltage is determined according to the feedback voltage in the previous implementation manner.
  • the application processor 203 may perform burn-in compensation only once for the aged pixels, that is, directly determine the burn-in compensation driving voltage according to the feedback voltage; it may also perform burn-in compensation for the aged pixels two or more times. Due to the limitation of the storage space of the device 10, the device usually only stores a limited number of photoelectric characteristic curves and aging compensation curves. In practical applications, the device usually needs to use multiple photoelectric characteristic curves for fitting to obtain the required photoelectric characteristic curve, and multiple aging compensation curves for fitting to obtain the required aging compensation curve. It can be understood that the accuracy of the photoelectric characteristic curve and the aging compensation curve used by the application processor 203 is difficult to guarantee, and the accuracy of the burn-in compensation cannot be guaranteed through one burn-in compensation.
  • the advantage of using one burn-in compensation method is that it takes a short time and the disadvantage is that the compensation accuracy is low; the advantage of using multiple burn-in compensation methods is that the compensation accuracy is high, but the disadvantage is that it takes a long time.
  • the operation performed by the application processor 203 includes: determining a first compensation value, and sending the first compensation value to the digital-to-analog converter 103, and the voltage and current in the first light-emitting diode under the initial driving voltage correspond to Point B in Figure 5, the voltage and current in the first light-emitting diode under the intermediate driving voltage correspond to point C in Figure 5; determine the position of point C in the photoelectric characteristic curve (504 in Figure 5), according to point C Determine the position of the first aging compensation curve (502 in Figure 5), then determine the position of point D in the first aging curve, determine the second photoelectric characteristic curve (503 in Figure 5) according to the position of point D, and finally determine the burn-in Compensate the driving voltage.
  • the application processor 203 adjusts the driving voltage of the target pixel driving circuit from the initial driving voltage to the intermediate driving voltage, and then adjusts the intermediate driving voltage to the burn-in compensation driving voltage, which can accurately adjust the target pixel
  • the brightness value is adjusted to the target brightness value.
  • the memory associated with the application processor 203 may store multiple photoelectric characteristic curves, and the multiple photoelectric characteristic curves all represent the voltage between the drain and the source of the first driving tube and the current in the first light emitting diode 402. And the voltage between the gate and the source of the first driving tube corresponding to any two photoelectric characteristic curves is different.
  • the memory associated with the application processor 203 stores multiple photoelectric characteristic curve tables, and each photoelectric characteristic curve table corresponds to a photoelectric characteristic curve.
  • the application processor 203 is further configured to obtain the first photoelectric characteristic curve from a plurality of preset photoelectric characteristic curves, or use the plurality of photoelectric characteristic curves to perform fitting to obtain the first photoelectric characteristic curve
  • the multiple photoelectric characteristic curves all represent the corresponding relationship between the voltage between the drain and source of the first drive tube and the current in the first light-emitting diode, and any two photoelectric characteristic curves correspond to the gate of the first drive tube
  • the voltage between the electrode and the source is different. Keep the voltage between the gate and the source of the first drive tube unchanged, and measure the corresponding relationship between the voltage between the drain and the source of the first drive tube and the current in the first light-emitting diode 402 to obtain a photoelectric characteristic curve.
  • the memory associated with the application processor 203 may store multiple aging compensation curves, and the multiple aging compensation curves all represent the voltage between the drain and the source of the first driving tube and the voltage in the first light emitting diode 402. The corresponding relationship of the current, and the aging degree of the first light emitting diode 402 corresponding to any two aging compensation curves is different.
  • the memory associated with the application processor 203 stores multiple aging compensation curve tables, and each aging compensation curve table corresponds to an aging compensation curve.
  • the application processor 203 is further configured to obtain the first aging compensation curve from multiple preset aging compensation curves, or use at least two of the multiple aging compensation curves to perform fitting to obtain the first aging compensation curve. An aging compensation curve.
  • FIG. 6 is a schematic structural diagram of another aging compensation circuit provided by an embodiment of the application.
  • the pixel drive circuit in FIG. 6 is the pixel drive circuit corresponding to the target pixel point in the screen.
  • the target pixel driving circuit includes a first driving tube 601 and a first light-emitting diode 602 corresponding to the target pixel.
  • the initial driving voltage provided by the digital-to-analog converter 103 is the input voltage of the gate of the first driving tube 601.
  • the source of the first driving tube 601 inputs a fixed voltage (for example, the power supply voltage V DD ), the drain of the first driving tube 601 is connected to one end of the first light emitting diode 602, and the other end of the first light emitting diode 602 is grounded (GND) Or negative voltage.
  • the detection circuit 202 in FIG. 6 is used to detect the voltage across the first light emitting diode 602, that is, the feedback voltage of the target pixel driving circuit.
  • one end of the first light emitting diode 602 is grounded, and the voltage across the first light emitting diode 602 detected by the detection circuit is used as the voltage of the drain of the first driving tube 601.
  • one end of the first light emitting diode 602 is connected to a negative voltage, and the sum of the voltage across the first light emitting diode 602 detected by the detection circuit and the negative voltage is used as the voltage of the drain of the first driving tube 601.
  • V D represents the drain voltage
  • V S represents the source voltage
  • V G represents the gate voltage
  • I SD represents the current in the first light emitting diode 602.
  • the driving tube in FIG. 6 has the opposite positions of the source and drain.
  • the voltage of the source of the first driving tube in FIG. 4 will change; since the source of the first driving tube in FIG. 6 is connected to a fixed voltage, its voltage will not change.
  • the aging of the light emitting diode will not affect the voltage between the gate and the source of the first drive tube in the target pixel drive circuit. In other words, when the driving voltage of the gate does not change, the voltage between the gate and the source of the driving tube does not change.
  • the source of the first driving tube 601 is a fixed voltage.
  • the application processor 203 obtains the feedback voltage of the target pixel drive circuit, the source voltage V S , the gate voltage V G , and the drain voltage V D of the first drive tube 601 can be determined, so that the first drive can be determined.
  • V DS is the difference between the drain voltage V D and the source voltage V S
  • the gate-source voltage V GS is the difference between the gate voltage V G and the source voltage V S.
  • FIG. 7 is a schematic diagram of another photoelectric characteristic curve and aging compensation curve provided by an embodiment of the application.
  • 701 is the initial aging compensation curve, that is, the corresponding curve of V DS and I DS when the first light-emitting diode is not aged
  • 702 is the corresponding curve of V DS and I DS after the first light-emitting diode has been aged for a period of time. That is, the third aging compensation curve
  • 703 represents the corresponding curve of V DS and I DS when V GS is 10.3V
  • 704 represents the corresponding curve of V DS and I DS when V GS is 10V.
  • the voltage and current in the first light-emitting diode 602 under the initial driving voltage correspond to point E in FIG. 7; after a period of aging, the first light-emitting diode 602 is initially driven
  • the voltage and current in the first light emitting diode 602 under voltage correspond to point F in FIG. 7. That is to say, when the driving voltage of the gate of the first driving tube is the initial driving voltage, the first light-emitting diode 602 ages after a period of time, and its current changes from I DS at point E to point F in FIG.
  • V G is a voltage generated by the digital-to-analog converter according to the grayscale value of the pixel, V G can be changed. Therefore, the driving voltage provided by the digital-to-analog converter to the pixel current can be adjusted to adjust the current in the first light emitting diode.
  • the application processor 203 may directly adjust the drive voltage of the target pixel drive circuit from the initial drive voltage to the burn-in compensation drive voltage.
  • the specific implementation manner is as follows:
  • the application processor 203 is specifically configured to determine the second drain voltage V D (that is, the voltage of the drain of the first driving tube 601) of the first driving tube 601 at the second moment (that is, the current moment) according to the feedback voltage.
  • the second drain voltage is related to the current aging degree of the target pixel;
  • the second drain voltage V D is the sum of the feedback voltage and the voltage connected to one end of the first light emitting diode 602, and one end of the first light emitting diode 602 is connected to one Known fixed voltage;
  • the second V D determine the second drain-source voltage V DS of the first driving tube at the second moment; the source of the first driving tube 601 is a known fixed voltage;
  • the third photoelectric characteristic curve is the photoelectric characteristic corresponding to the current V GS curve
  • a second aging compensation curve (702 in FIG. 7) is determined according to the second aging point, and the second aging compensation curve is related to the aging degree of the target pixel at the second moment, and the second aging compensation curve represents the target The corresponding relationship between the drain-source voltage V DS of the first driving tube and the current I DS of the first light-emitting diode when the pixel is at the aging degree at the second moment;
  • V GS corresponding to the fourth photoelectric characteristic curve is the second target voltage
  • the burn-in compensation driving voltage at the second moment is determined; the second V S is the source voltage of the first driving tube 601.
  • the operation performed by the application processor 203 includes: first determining the position of point F (ie, the second aging point) in the third photoelectric characteristic curve (704 in FIG. 7), and then determining the second Aging compensation curve (702 in Figure 7), and then determine the H point position (ie, the second reference point) in the second aging curve, and then determine the fourth photoelectric characteristic curve (703 in Figure 7) according to the H point position, Finally, determine the burn-in compensation drive voltage.
  • the application processor 203 can directly compensate the driving voltage of the target pixel driving circuit from the initial driving voltage to the burn-in compensation driving voltage, so as to adjust the brightness value of the target pixel to the target brightness value.
  • the operation is simple, It can effectively solve the aging problem of light-emitting diodes.
  • the device 10 Since the driving voltage provided by the digital-to-analog converter 103 has a range, the device 10 has a certain compensation effect limit for aging compensation. When the device 10 confirms that the aging compensation for the aging area has reached the limit of the compensation effect or is invalid, the photoelectric characteristic curve is used to correct the unaging area, so that the brightness of the unaging area is reduced close to that of the aging area, and gamma 2.2 is maintained. curve. In other words, there is no way to adjust the aging area. At this time, adjust the unaging area so that the brightness of the entire screen conforms to the gamma2.2 curve.
  • the aging area refers to the area where the pixels corresponding to the aging light-emitting diodes on the screen are located, and the unaging area refers to the area on the screen excluding the aging area.
  • the target grayscale value of any pixel determined by the application processor 203 is greater than the limit grayscale value, it is confirmed that the aging compensation for any pixel has reached the compensation effect limit or invalid.
  • FIG. 8 is a schematic diagram of another photoelectric characteristic curve and aging compensation curve provided by an embodiment of the application.
  • 801 is the initial aging compensation curve, that is, the corresponding curve of V DS and I DS when the first light emitting diode is not aged; 802 is the corresponding curve of V DS and I DS after the first light emitting diode has been aged for a period of time; 803 to 806 indicate the corresponding curves of V DS and I DS when V GS is 10.3V, 10V, 9V and 8.8V.
  • FIG. 9 is a schematic diagram of pixels of a screen provided by an embodiment of the application. In Figure 9, the initial current from pixel 1 to pixel 9 (which is proportional to the brightness) corresponds to the position of point A in Figure 8.
  • the current of pixel 1 after aging changes from the position of point A in Figure 8
  • the position of point B after confirming that the pixel point 1 cannot return to the position of point D in Figure 8, the photoelectric characteristic curve can be used to correct the current of pixel point 2 to pixel point 9, that is, the current of pixel point 2 to pixel point 9 can be changed from the figure
  • the position of point A in 8 is adjusted to the position of point M, and the current at point B is the same as the current at point M.
  • the application processor 203 performs burn-in compensation on the target pixel and cannot make the target pixel display the target brightness value, it performs burn-in compensation on the pixels on the screen other than the target pixel to make the screen
  • the brightness value of each pixel is decreased in an equal proportion or the brightness value of each pixel is made uniform.
  • the following takes the target pixel and reference pixel on the screen as an example to introduce how to perform burn-in compensation on the reference pixel when the brightness of the target pixel cannot be controlled to the target brightness value.
  • the aging degree of the first light emitting diode corresponding to the target pixel is different from the aging degree of the second light emitting diode corresponding to the reference pixel.
  • the application processor 203 may determine the reference gray scale value of the reference pixel when the determined target gray scale value of the target pixel is greater than the limit gray scale value, and the reference gray scale value is used to adjust the display of the reference pixel. The brightness value.
  • the reference grayscale value is the grayscale value when the reference pixel displays the reference brightness value, and the reference brightness value is equal to that of the target pixel drive circuit. Driven by the initial driving voltage, the brightness value displayed by the aging target pixel.
  • the reference grayscale value is the grayscale value when the reference pixel displays the intermediate brightness value, and the intermediate brightness value is relative to the image source.
  • the decrease (or increase) ratio of the theoretical brightness value of the reference pixel is equal to the decrease (or increase) ratio of the actual brightness value to the theoretical brightness value of the target pixel in the image source.
  • the actual brightness value is the target pixel drive circuit in the initial drive Driven by the voltage, the brightness value displayed by the aging target pixel.
  • the application processor 203 can use different methods to determine the brightness value of the reference pixel to be displayed, so that after the reference pixel is burn-in compensation, the brightness value of each pixel in the screen is equal in proportion Decrease or make the brightness value of each pixel uniform.
  • the method for the application processor 203 to perform burn-in compensation for the reference pixel is similar to the method for the target pixel to perform burn-in compensation, and will not be repeated here.
  • the device solves the problem that the aging pixel cannot be adjusted to the required brightness value through burn-in compensation by adjusting the driving voltage of the unaging pixel, which is simple to implement.
  • FIG. 10 is a schematic structural diagram of another device for screen brightness according to an embodiment of the application.
  • the device in FIG. 10 is a further subdivision of the device in FIG. 2.
  • the device 10 further includes an analog-to-digital converter (ADC) 1004, a first memory 1005, and a third memory 1006;
  • the burn-in compensation module 104 includes a burn-in compensation unit 1001, a second Storage 1002.
  • the ADC 1004 (that is, the detection circuit 203) is used to convert the acquired feedback voltage of the target pixel into a digital signal and store it in the first memory 1005.
  • the application processor 203 is configured to obtain a digital signal corresponding to the feedback voltage from the first memory 1005, and determine the burn-in compensation driving voltage of the target pixel according to the feedback voltage.
  • the second memory 1002 is used to store the data required by the application processor 203 to determine the burn-in compensation driving voltage according to the feedback voltage, such as photoelectric characteristic curves, aging compensation curves, etc.
  • the second memory 1002 is also used to store the burn-in compensation driving voltage.
  • the burn-in compensation unit 1001 is configured to determine the target gray-scale value corresponding to the burn-in compensation driving voltage, and send the target gray-scale value to the DAC103.
  • the third memory 1006 is used to store the Mura compensation table (ie, compensation data) required by the Mura corrector 101 to perform Demura on the pixels in the screen.
  • the burn-in compensation circuit related to burn-in compensation in the device 10 is further refined below, so as to describe the burn-in compensation process more clearly.
  • the aging compensation circuit in FIG. 11 is a further subdivision of the aging compensation circuit in FIG. 10.
  • the operation implemented by the application processor 203 includes: obtaining a digital signal corresponding to the feedback voltage of the target pixel driving circuit, and determining the preliminary aging compensation data of the target pixel according to the feedback voltage (that is, the intermediate data in the foregoing embodiment). Driving voltage); according to the photoelectric characteristic curve, the aging compensation curve and the preliminary aging compensation data, the preliminary aging compensation data is corrected to obtain the burn-in compensation driving voltage. As shown in FIG.
  • the burn-in compensation module 104 performs burn-in compensation twice for the aging target pixel. That is, the application processor 203 determines the intermediate driving voltage (that is, preliminary aging compensation data) according to the first feedback voltage of the target pixel driving circuit (the driving voltage is the initial driving voltage); the DAC103 provides the intermediate driving voltage to the target pixel driving circuit The application processor 203 determines the burn-in compensation driving voltage according to the second feedback voltage, the photoelectric characteristic curve and the aging compensation curve of the target pixel driving circuit (the driving voltage is the intermediate driving voltage), that is, corrects the preliminary aging compensation data to Obtain the burn-in compensation driving voltage.
  • the intermediate driving voltage that is, preliminary aging compensation data
  • Each module in the device 10 may be one or more integrated circuits configured to implement the above methods, for example: one or more application-specific integrated circuits (ASIC), or one or more digital signal processing Digital signal processor (DSP), or one or more field-programmable gate arrays (FPGA), etc.
  • ASIC application-specific integrated circuits
  • DSP digital signal processing Digital signal processor
  • FPGA field-programmable gate arrays
  • the processing element may be a general-purpose processor, such as a central processing unit (CPU) or other processors that can call programs.
  • CPU central processing unit
  • these modules can be integrated together and implemented in the form of a system-on-a-chip (SOC).
  • SOC system-on-a-chip
  • FIG. 12 is a schematic flowchart of a method for controlling screen brightness according to an embodiment of the present application.
  • the control method is applied to a device for screen brightness.
  • the device includes a processor, a Mura corrector, a first gamma corrector, and a second Gamma corrector and digital-to-analog converter, the method may include:
  • the second gamma corrector determines the initial brightness value corresponding to the target pixel in the current gear according to the first gamma correction table.
  • the target pixel is any pixel on the screen.
  • the Mura corrector performs Demura on the initial brightness value of the target pixel to obtain the target brightness value.
  • the first Gamma corrector determines the input grayscale value corresponding to the target brightness value according to the second Gamma correction table.
  • the second Gamma correction table includes multiple groups of Gamma correction relationships between brightness values and grayscale values.
  • the digital-to-analog converter obtains the initial driving voltage according to the input grayscale value.
  • the initial driving voltage is used to control the target pixel driving circuit, so that the brightness displayed by the target pixel is the target brightness value.
  • the processor determines the target grayscale value when the current display brightness value of the target pixel is inconsistent with the target brightness value.
  • the brightness displayed by the target pixel under the driving of the initial driving voltage is not equal to the target brightness value, and the target grayscale value is the grayscale value when the target pixel displays the target brightness value.
  • the processor sends the target grayscale value to the digital-to-analog converter.
  • the device further includes a burn-in compensation module and a memory.
  • the processor determines that the target gray-scale value is not greater than the limit gray-scale value
  • the target gray-scale value is stored in the burn-in compensation module.
  • the compensation module obtains the target grayscale value and sends it to the digital-to-analog converter.
  • the digital-to-analog converter obtains a burn-in compensation driving voltage according to the target grayscale value.
  • the target pixel driving circuit is driven by the burn-in compensation driving voltage to make the brightness value displayed by the aging target pixel point is the target brightness value.
  • Steps 1206 to 1207 can be replaced with: when the target grayscale value is greater than the limit grayscale value, the processor determines a reference grayscale value, where the reference pixel is that the aging degree of the screen is different from the aging degree of the target pixel.
  • the reference grayscale value is a grayscale value for compensating the brightness of the reference pixel, and the reference pixel is other pixels in the screen except the target pixel; the digital-to-analog converter is based on the The reference gray scale value obtains the reference burn-in compensation driving voltage.
  • the reference pixel driving circuit is driven by the reference burn-in compensation driving voltage, so that the brightness value displayed by the reference pixel is equal to the brightness value displayed by the target pixel driving circuit under the initial driving voltage and the aging target pixel.
  • the device for screen brightness provided in the embodiments of the present application considers Demura, Gamma correction, and burn-in compensation, which can effectively eliminate Mura phenomenon, solve the aging problem of the screen, and realize Gamma correction on the brightness of the screen display, so that the screen displays
  • the brightness of the image is consistent with the original brightness of the original input image.
  • FIG. 13 is a schematic diagram of the hardware structure of a terminal device provided by an embodiment of the present application.
  • the terminal device 1300 includes: a Mura corrector 1301, a first Gamma corrector 1302, a digital-to-analog converter 1303, a burn-in compensation module 1304, and a screen 1305.
  • the mura corrector 1301 is used to perform Demura on the target pixel on the screen 1305 to obtain the target brightness value corresponding to the target pixel, and the target brightness value is the theoretical brightness value of the target pixel in the input image source.
  • the first Gamma corrector 1302 is used to determine the input grayscale value corresponding to the target brightness value.
  • the digital-to-analog converter 1303 is configured to obtain an initial driving voltage according to the input grayscale value, and the initial driving voltage is used to control the target pixel driving circuit so that the brightness displayed by the target pixel is the target brightness value.
  • the burn-in compensation module 1304 is configured to obtain a target grayscale value or a reference grayscale value when the brightness value displayed by the target pixel at the current moment is inconsistent with the target brightness value, and the target grayscale value is the The grayscale value of the target pixel when the target brightness value is displayed at the current moment, the reference grayscale value is the grayscale value of the reference pixel when the reference brightness value is displayed at the current moment, the reference pixel For pixels on the screen with different aging degrees from those of the target pixel, the reference brightness value is positively correlated with the brightness value displayed by the target pixel at the current moment.
  • the digital-to-analog converter 1303 is further configured to control the display brightness of the target pixel according to the target grayscale value; or,
  • the digital-to-analog converter 1303 is also used to control the display brightness of the reference pixel according to the reference grayscale value.
  • the terminal device 1300 further includes:
  • the second gamma corrector 1306 is configured to determine the initial brightness value corresponding to the target pixel in the current gear according to the first gamma correction table;
  • the mura corrector 1301 is specifically configured to perform Demura on the initial brightness value of the target pixel to obtain the target brightness value;
  • the first gamma corrector 1302 is specifically configured to determine the input grayscale value corresponding to the target brightness value according to the second gamma correction table; the second gamma correction table is the brightness of the screen under the specified gear of brightness adjustment Gamma correction relationship between the value and the input grayscale value; the first gamma correction table is obtained according to the second gamma correction table.
  • the terminal device 1300 further includes: a detection circuit.
  • the terminal device in the embodiment of the present application can execute the brightness control method of the screen in the foregoing embodiment. The specific process and steps of the brightness control method of the screen have been described in detail in the foregoing embodiment, and will not be repeated here.
  • the terminal device in the embodiment of the present application may be the device 10 in the foregoing embodiment, or may be a device including the device 10, such as a mobile phone.
  • the first gamma corrector 1302, the second gamma corrector 1306, and the burn-in compensation module 1304 may be integrated on the same processor, or may be independent hardware logic or hardware circuits.
  • the Mura corrector 1301 may be integrated on the burn-in compensation module 1304, or may be a hardware logic or hardware circuit independent of the burn-in compensation module 1304.
  • the digital-to-analog converter 1303 can usually be independent hardware, such as a drive circuit.
  • the burn-in compensation module 1304 corresponds to the burn-in compensation module 104, or to the burn-in compensation module 104 and the application processor 203 (that is, the burn-in compensation module 1304 implements the functions of the burn-in compensation module 104 and the application processor 203).
  • the burn-in compensation module 1304 may be an application processor.
  • the terminal device 1300 may further include a memory 1307, where the memory 1307 is used to store a preset Gamma correction table and compensation data required by the Mura corrector 1301 to perform Demura.
  • the screen 1305 is usually composed of an organic light emitting display (Organic Light Emitting Display, OLED for short) or an active-matrix organic light emitting diode (AMOLED).
  • OLED Organic Light Emitting Display
  • AMOLED active-matrix organic light emitting diode
  • the digital-to-analog converter 1303 may include a voltage generator and a brightness controller.
  • the voltage generator can be used to generate the corresponding driving voltage according to the input gray scale value; and the brightness controller can be used to control the screen to display the display brightness value corresponding to the input gray scale value based on the driving voltage.
  • the voltage generator may be a digital-to-analog converter (DAC).
  • the digital-to-analog converter is used to convert the input grayscale value into an analog reference voltage value, so that the brightness controller can control the display brightness value of the screen according to the reference voltage, so that the screen displays the corresponding display brightness value when the screen is powered on.
  • the digital-to-analog converter can change the input gray-scale value into an actual voltage value after receiving the input gray-scale value in the form of a digital signal.
  • the corresponding voltage value will also change, so that the screen can emit light of different brightness under the excitation of different voltage values and current values to display the actual image.
  • the burn-in compensation module 1304, the Mura corrector 1301, the first Gamma corrector 1302, the second Gamma corrector 1306, the digital-to-analog converter 1303, and the memory 1307 can use a communication bus or other data paths to realize data and signal communication. Between the transmission. Since the memory 1307 is electrically connected to the burn-in compensation module 1304, the Mura corrector 1301, and the first Gamma corrector 1302, the preset second Gamma correction table stored in the memory 1307 can be transmitted to the first Gamma corrector 1302, the compensation data stored in the memory 1307 may be transmitted to the Mura corrector 1301.
  • the burn-in compensation module 1304 is usually the control center of the terminal device, and can use the communication bus to connect with different hardware parts such as the memory 1307, and run or execute software programs and/or modules, and call data stored in the memory. , To perform various functions of the terminal device and process data to complete the brightness control operation of the screen.
  • the processor 1304 may be a Microcontroller Unit (MCU), or a central processing unit (CPU), or an independent system-on-a-chip (SOC), or it may be One or more integrated circuits configured to implement the above methods, for example: one or more application specific integrated circuits (ASIC), or, one or more microprocessors (digital singnal processors, DSP), or, One or more field programmable gate arrays (FPGA), etc.
  • MCU Microcontroller Unit
  • CPU central processing unit
  • SOC independent system-on-a-chip
  • ASIC application specific integrated circuits
  • DSP digital singnal processors
  • FPGA field programmable gate arrays
  • the burn-in compensation module 1304 may include one or more processing units; and use different processing units to execute the above-mentioned different instructions and programs to execute different functions respectively.
  • the memory 1307 may be a read-only memory (ROM) or other types of static storage devices that can store static information and instructions, random access memory (RAM), or other types that can store information and instructions.
  • the type of dynamic storage device can also be electrically erasable programmable read-only memory (EEPROM), compact disc read-only memory (CD-ROM), or other optical disk storage, CD-ROM Storage (including compact discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or can be used to carry or store desired program codes in the form of instructions or data structures and can be used by Any other medium accessed by the computer, but not limited to this.
  • the memory 1307 may exist independently, and is connected to the burn-in compensation module 1304 and the first Gamma correction 1303 through a bus.
  • the memory 1307 may also be integrated with the burn-in compensation module 1304.
  • the memory 1307 can also be used to store application program codes for executing the solution of the present application, and the burn-in compensation module 1304 controls the execution.
  • the burn-in compensation module 1304 is configured to execute the application program code stored in the memory 1307, so as to implement the brightness control method of the screen provided in the foregoing embodiment of the present application.
  • the terminal device may also include an I/O subsystem for connecting the external device and the terminal device itself.
  • the I/O subsystem can be used to realize data interaction with external devices, so as to realize the input and output of data collected by external devices, and control the working status of external devices.
  • the above embodiments it may be implemented in whole or in part by software, hardware, firmware or any combination thereof.
  • a software program it may be implemented in the form of a computer program product in whole or in part.
  • the computer program product includes one or more computer instructions.
  • the computer may be a general-purpose computer, a dedicated computer, a computer network, or other programmable devices.
  • the computer instruction may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium.
  • the computer instruction may be transmitted from a website, computer, server, or data center through a cable (Such as coaxial cable, optical fiber, digital subscriber line (digital subscriber line, DSL)) or wireless (such as infrared, wireless, microwave, etc.) to another website site, computer, server or data center.
  • the computer-readable storage medium may be any available medium that can be accessed by a computer or may include one or more data storage devices such as a server or a data center that can be integrated with the medium.
  • the usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, and a magnetic tape), an optical medium (for example, a DVD), or a semiconductor medium (for example, a solid state disk (SSD)).

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Abstract

La présente invention concerne un appareil et un procédé de commande de luminosité d'affichage. L'appareil comprend : un module de compensation de rémanence d'image (104, 1304) servant à acquérir une valeur d'échelle de gris cible ou une valeur d'échelle de gris de référence lorsqu'une valeur de luminosité d'affichage actuelle d'un point de pixel cible dans un écran est incohérente par rapport à une valeur de luminosité cible de celui-ci, la valeur d'échelle de gris cible étant une valeur d'échelle de gris servant à compenser la luminosité du point de pixel cible, la valeur d'échelle de gris de référence étant une valeur d'échelle de gris servant à compenser la luminosité d'un point de pixel de référence, et le point de pixel de référence étant un point de pixel autre que le point de pixel cible dans l'écran ; et un convertisseur numérique-analogique (103, 1303) servant à commander la luminosité d'affichage du point de pixel cible selon la valeur d'échelle de gris cible, ou un convertisseur numérique-analogique (103, 1303) servant à commander la luminosité d'affichage du point de pixel de référence selon la valeur d'échelle de gris de référence. L'effet d'affichage de luminosité d'affichage peut être efficacement amélioré.
PCT/CN2019/087497 2019-05-17 2019-05-17 Appareil et procédé de commande de luminosité d'affichage WO2020232588A1 (fr)

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