WO2023216321A1 - 亮度补偿方法及装置、可读存储介质、显示装置 - Google Patents

亮度补偿方法及装置、可读存储介质、显示装置 Download PDF

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Publication number
WO2023216321A1
WO2023216321A1 PCT/CN2022/095097 CN2022095097W WO2023216321A1 WO 2023216321 A1 WO2023216321 A1 WO 2023216321A1 CN 2022095097 W CN2022095097 W CN 2022095097W WO 2023216321 A1 WO2023216321 A1 WO 2023216321A1
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Prior art keywords
brightness value
sub
pixel
brightness
value
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English (en)
French (fr)
Inventor
田凡
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Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
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Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
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Priority to US17/790,165 priority Critical patent/US12380846B2/en
Publication of WO2023216321A1 publication Critical patent/WO2023216321A1/zh
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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
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/04—Maintaining the quality of display appearance
    • G09G2320/043—Preventing or counteracting the effects of ageing
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/021—Power management, e.g. power saving
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/16—Calculation or use of calculated indices related to luminance levels in display data

Definitions

  • the present application relates to the field of display technology, and specifically to a brightness compensation method and device, a readable storage medium, and a display device.
  • OLED Organic Light Emitting Diode
  • OLED is a current-type organic light-emitting device that emits light through the injection and recombination of carriers.
  • the luminous intensity is proportional to the injected current.
  • the holes generated by the anode and the electrons generated by the cathode will move, inject into the hole transport layer and electron transport layer respectively, and migrate to the light-emitting layer.
  • the two meet in the light-emitting layer they generate energy excitons, which excite the light-emitting molecules and ultimately produce visible light.
  • OLED display panels have been applied to mobile phones, tablets and other display fields.
  • the existing compensation method is to compensate the brightness of the OLED by increasing the current.
  • the existing compensation method will advance the life of the OLED and cannot fundamentally increase the life of the OLED device. On the contrary, it accelerates the aging of the device.
  • This application provides a brightness compensation method and device, a readable storage medium, and a display device to solve the problems of uneven brightness and accelerated aging of the display device.
  • This application provides a brightness compensation method, which includes:
  • the step of obtaining the brightness value of each sub-pixel in all sub-pixels when the working time is t includes:
  • the N driving current values are converted into current stress values, thereby obtaining N current stress values, respectively:
  • the brightness value L of the sub-pixel is obtained according to the accumulated value sum stress ,
  • L 0 is the initial brightness value of the sub-pixel
  • ⁇ and ⁇ are the characteristic parameters of the organic light-emitting device of the sub-pixel.
  • the step of obtaining the driving current value I of the sub-pixel in each of the time periods includes:
  • M is greater than or equal to 1;
  • An average driving current value of the M driving current values is obtained, and the average driving current value is used as the driving current value I of the sub-pixel in each of the time periods.
  • the step of obtaining the brightness value of each sub-pixel in all sub-pixels when the working time is t includes:
  • L 0 is the initial brightness value of the sub-pixel
  • P is the driving electrical performance parameter
  • c and d are the characteristic parameters of the organic light-emitting device of the sub-pixel.
  • the step of obtaining the standard brightness value of the sub-pixel when the working time is t includes:
  • the standard brightness value of the sub-pixel when the working time is t is obtained through the standard brightness curve.
  • the step of comparing the minimum brightness value with the standard brightness value to obtain a compensated brightness value includes:
  • the standard brightness value is a compensation brightness value
  • the minimum brightness value is greater than the standard brightness value, the minimum brightness value is a compensated brightness value.
  • the step of comparing the minimum brightness value with the standard brightness value to obtain a compensated brightness value includes:
  • the standard brightness value is a compensation brightness value
  • the minimum brightness value is greater than the standard brightness value, a maximum brightness value among the brightness values of all sub-pixels is obtained, and the maximum brightness value is a compensation brightness value.
  • the step of driving all sub-pixels according to the compensated brightness value includes:
  • the compensation coefficient ⁇ is obtained according to the ratio between the compensated brightness value and the brightness value of the sub-pixel
  • ⁇ L t /L, where L t is the compensation brightness value and L is the brightness value of the sub-pixel;
  • the value of the driving electrical performance parameter of the sub-pixel is adjusted to the value of the compensation driving electrical performance parameter.
  • the driving electrical performance parameters include any one of the driving voltage and driving current of the sub-pixel.
  • this application also provides a brightness compensation device, which includes:
  • a brightness acquisition module which is used to acquire the brightness value of each sub-pixel in all sub-pixels when the working time is t;
  • a brightness comparison module the brightness comparison module is used to obtain the minimum brightness value among the brightness values of all sub-pixels
  • a standard brightness module which is used to obtain the standard brightness value of the sub-pixel when the working time is t;
  • a compensation module the compensation module is used to compare the minimum brightness value with the standard brightness value to obtain a compensation brightness value
  • a driving module the driving module is used to drive all sub-pixels according to the compensated brightness value.
  • this application also provides a readable storage medium that stores a computer program that can be run on a processor, and the processor executes the computer program to implement the brightness compensation method.
  • the brightness compensation method includes:
  • the present application also provides a display device.
  • the display device includes a processor, a memory, and a computer program stored in the memory and executable on the processor.
  • the processor executes the computer program. Program to implement the steps in the brightness adjustment method; wherein the brightness compensation method includes:
  • the step of obtaining the brightness value of each sub-pixel in all sub-pixels when the working time is t includes:
  • the N driving current values are converted into current stress values, thereby obtaining N current stress values, respectively:
  • the brightness value L of the sub-pixel is obtained according to the accumulated value sum stress ,
  • L 0 is the initial brightness value of the sub-pixel
  • ⁇ and ⁇ are the characteristic parameters of the organic light-emitting device of the sub-pixel.
  • the step of obtaining the driving current value I of the sub-pixel in each of the time periods includes:
  • M is greater than or equal to 1;
  • An average driving current value of the M driving current values is obtained, and the average driving current value is used as the driving current value I of the sub-pixel in each of the time periods.
  • the step of obtaining the brightness value of each sub-pixel in all sub-pixels when the working time is t includes:
  • L 0 is the initial brightness value of the sub-pixel
  • P is the driving electrical performance parameter
  • c and d are the characteristic parameters of the organic light-emitting device of the sub-pixel.
  • the step of obtaining the standard brightness value of the sub-pixel when the working time is t includes:
  • the standard brightness value of the sub-pixel when the working time is t is obtained through the standard brightness curve.
  • the step of comparing the minimum brightness value with the standard brightness value to obtain a compensated brightness value includes:
  • the standard brightness value is a compensation brightness value
  • the minimum brightness value is greater than the standard brightness value, the minimum brightness value is a compensated brightness value.
  • the step of comparing the minimum brightness value with the standard brightness value to obtain a compensated brightness value includes:
  • the standard brightness value is a compensation brightness value
  • the minimum brightness value is greater than the standard brightness value, a maximum brightness value among the brightness values of all sub-pixels is obtained, and the maximum brightness value is a compensation brightness value.
  • the step of driving all sub-pixels according to the compensated brightness value includes:
  • the compensation coefficient ⁇ is obtained according to the ratio between the compensated brightness value and the brightness value of the sub-pixel
  • ⁇ L t /L, where L t is the compensation brightness value and L is the brightness value of the sub-pixel;
  • the value of the driving electrical performance parameter of the sub-pixel is adjusted to the value of the compensation driving electrical performance parameter.
  • the driving electrical performance parameters include any one of the driving voltage and driving current of the sub-pixel.
  • the brightness compensation method includes: obtaining the brightness value of each sub-pixel in all sub-pixels when the working time is t; obtaining the brightness of all sub-pixels. The minimum brightness value in the value; obtain the standard brightness value of the sub-pixel when the working time is t; compare the minimum brightness value with the standard brightness value to obtain the compensation brightness value; calculate the compensation brightness value according to the compensation brightness value All sub-pixels are driven.
  • This application first obtains the brightness value of all sub-pixels, and then obtains the brightness value of the most severely aged sub-pixel among all sub-pixels, which is the minimum brightness value, and then compares the minimum brightness value with the standard brightness value to obtain the compensation brightness value. , and then use the compensated brightness value to drive all the sub-pixels, thereby improving the uniformity of the brightness of the display device, while reducing the aging speed of the display device and extending its life.
  • Figure 1 is a flow chart of the brightness compensation method provided by this application.
  • Figure 2 is the actual brightness curve of the sub-pixel
  • FIG. 3 is a flow chart of the first embodiment of step S10 of the brightness compensation method provided by this application;
  • FIG. 4 is a flow chart of step S12 of the brightness compensation method provided by this application.
  • FIG. 5 is a flow chart of step S30 of the brightness compensation method provided by this application.
  • Figure 6 is the standard brightness curve of sub-pixels
  • FIG. 7 is a flow chart of the first embodiment of step S40 of the brightness compensation method provided by this application.
  • Figure 8 is a schematic diagram where the minimum brightness value is less than the standard brightness value
  • Figure 9 is a schematic diagram where the minimum brightness value is greater than the standard brightness value
  • FIG. 10 is a flow chart of step S50 of the brightness compensation method provided by this application.
  • FIG 11 is a flow chart of step S10 of the second embodiment of the brightness compensation method provided by this application.
  • Figure 12 is a flow chart of step S40 of the second embodiment of the brightness compensation method provided by this application.
  • FIG 13 is a schematic diagram of the brightness compensation device provided by this application.
  • first and second are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, features defined as “first” and “second” may explicitly or implicitly include one or more of the described features. In the description of this application, “plurality” means two or more than two, unless otherwise explicitly and specifically limited.
  • the display device is a self-luminous display device, such as an OLED display device, and the display device includes a plurality of sub-pixels, each Each sub-pixel includes an organic light-emitting device.
  • the description order of the following embodiments is not intended to limit the preferred order of the embodiments of the present application.
  • FIG. 1 is a flow chart of the brightness compensation method provided by this application.
  • This application provides a brightness compensation method, which includes the following steps:
  • the luminous efficiency of the organic light-emitting devices of the OLED display panel will decrease. That is, under the same driving current, the brightness of the organic light-emitting devices will decrease, that is, the organic light-emitting devices will age. Therefore, the brightness values of the sub-pixels at different working hours are obtained, and the brightness values can reflect the aging degree of the organic light-emitting device.
  • the initial brightness of the sub-pixels of the OLED display panel is 1, that is, when the working time is zero, the brightness value of the sub-pixels of the OLED display panel is 1.
  • the working time increases, the brightness of the sub-pixels of the OLED display panel increases. The value will be below 1 and in the range 0 to 1.
  • the minimum brightness value of the brightness values of all sub-pixels is obtained by comparing the brightness values of all sub-pixels.
  • Figure 2 is an actual brightness curve of a sub-pixel. The brightness value of each sub-pixel can be statistically accumulated to form an actual brightness curve.
  • the sub-pixels include red light sub-pixels, green light sub-pixels, blue light sub-pixels and white light sub-pixels.
  • the standard brightness value of the sub-pixels may be the standard brightness value of the red light sub-pixel, the green light sub-pixel and the red light sub-pixel. Any one of the standard brightness value of the photosub-pixel, the standard brightness value of the blue-light sub-pixel, and the standard brightness value of the white-light sub-pixel, or the red-light sub-pixel, the green-light sub-pixel, or the blue-light sub-pixel.
  • the same standard brightness value is used as the white light sub-pixel, and can be set according to specific needs.
  • the luminous efficiency of the organic light-emitting devices of the OLED display panel will decrease. That is, under the same driving current, the brightness of the organic light-emitting devices will decrease, that is, the organic light-emitting devices will age. Therefore, in order to reflect the standard aging of organic light-emitting devices, when the organic light-emitting device operates for t, the organic light-emitting device has a corresponding standard brightness value under the same driving current.
  • the brightness value of the sub-pixel is greater than
  • the brightness value of the sub-pixel is less than the standard brightness value, it means that the aging speed of the sub-pixel is slower than the standard aging speed.
  • the brightness value of the sub-pixel is less than the standard brightness value, it means that the aging speed of the sub-pixel is faster than the standard aging speed.
  • the minimum brightness value is compared with the standard brightness value to obtain the aging condition of the sub-pixels of the OLED display panel. Then determine the compensation brightness value based on the aging situation.
  • the compensation brightness value is between 0 and 1.
  • the compensation brightness value is converted into a driving electrical performance parameter, and then the driving electrical performance parameter is set to the electrical performance of the sub-pixel.
  • Performance parameters can drive sub-pixels. Since all sub-pixels are driven using compensated brightness values, the brightness of the OLED display panel is uniform. At the same time, this application drives all sub-pixels based on the compensated brightness value. It does not simply improve the brightness uniformity of the OLED display panel by increasing the driving current of the sub-pixels, thereby reducing the aging rate of the display device and extending its life.
  • steps S10, S20, S30, S40 and S50 in the above process to illustrate the process of the brightness compensation method of the present application is only to facilitate the understanding of the method process, and does not describe the specific sequence of steps of the brightness compensation method of the present application. limitation, the brightness compensation method of the present application may also have other step sequences that can achieve the purpose of the invention of the present application, which is not limited here.
  • Figure 3 is a flow chart of a first embodiment of step S10 of the brightness compensation method provided by this application.
  • S10 includes:
  • the working time t of the sub-pixel is divided into N time periods.
  • the N time periods may be N time periods of equal length, or N time periods of unequal length.
  • the N time periods may also include multiple time periods. time periods of equal length.
  • stress IN a ⁇ stress ref
  • stress ref is the current stress value corresponding to the sub-pixel at the reference current I ref
  • b is Characteristic parameters of sub-pixel organic light-emitting devices.
  • L 0 is the initial brightness value of the sub-pixel
  • ⁇ and ⁇ are the characteristic parameters of the organic light-emitting device of the sub-pixel.
  • N time periods that can be N time periods of equal length as an example to illustrate step S10: the working time t is 150 hours, and 150 hours is divided into 10 time periods of equal length, then 10 time periods They are: the first time period is from 0 to the 15th hour, the second time period is from the 15th hour to the 30th hour, the third time period is from the 30th hour to the 45th hour, and the fourth time period is from the 45th hour to the 45th hour.
  • the fifth time period is from the 60th to the 75th hour
  • the sixth time period is from the 75th to the 90th hour
  • the seventh time period is from the 90th to the 105th hour
  • the eighth time period is from the 105th hour to the 120th hour
  • the ninth time period is from the 120th hour to the 135th hour
  • the tenth time period is from the 135th hour to the 150th hour. That is to say, the driving current value I of the sub-pixel in each of the time periods is obtained. For a total of N driving current values of N time periods, the driving current value I of the sub-pixel in the first time period is obtained.
  • the driving current value I 10 for ten time periods. Convert the above 10 driving current values into current stress values to obtain 10 current stress values, namely stress I1 , stress I2 , stress I3, stress I4 , stress I5 , stress I6 , stress I7 , stress I8 , stress I9 .
  • sum stress stress I1 +stress I2 +stress I3 +stress I4 +stress I5 +stress I6 +stress I7 +stress I8 +stress I9 +stress I10 .
  • FIG. 4 is a flow chart of step S12 of the brightness compensation method provided by this application.
  • S12 includes:
  • the working time is 150 hours
  • divide 150 hours into 10 equal-length time periods obtain the 5 driving current values of the sub-pixel in the first time period, and then obtain the average driving current value of the 5 driving current values, Then the average driving current value is the driving current value I 1 of the sub-pixel in the first time period, and by analogy, the driving current values in the remaining time periods are obtained in the above manner.
  • M driving current values of the sub-pixel in each time period and then obtaining the average driving current value of the M driving current values, the accuracy of the driving current value can be improved.
  • the value of M in each time period may be the same or different, and the value of M in each time period may be selected according to actual needs.
  • FIG. 5 is a flow chart of step S30 of the brightness compensation method provided by this application.
  • S30 includes:
  • the standard brightness curve is a graph of the standard brightness of the sub-pixel and the working time T;
  • the standard brightness curve of the sub-pixel includes any one of the standard brightness curve of the red light sub-pixel, the standard brightness curve of the green light sub-pixel, the standard brightness curve of the blue light sub-pixel and the standard brightness curve of the white light sub-pixel, or , it is also possible that the red light sub-pixel, the green light sub-pixel, the blue light sub-pixel and the white light sub-pixel have a common standard brightness curve.
  • Figure 6 is a standard brightness curve of a sub-pixel.
  • the standard brightness curve is a process in which the standard brightness of a sub-pixel will gradually decrease as the working time increases.
  • the standard brightness curve can be stored in the display device before it leaves the factory. In memory, the standard brightness curve can also be stored on the server or in the cloud.
  • the provided brightness compensation method also includes the step of establishing a standard brightness curve of the sub-pixel.
  • This step includes the following process: test the standard brightness of the sub-pixel under different working durations, and obtain at least two sets of working durations and standard brightness curves. Correspondence data of brightness values; fit according to the correspondence data of at least two sets of working hours and standard brightness values obtained through testing to obtain a standard brightness curve.
  • the fitting performed can be a linear function fitting.
  • the number of groups of data corresponding to the measured working hours and standard brightness values can be selected according to actual needs. The more groups, the more accurate the final standard brightness curve will be.
  • the corresponding standard brightness value only needs to be found on the standard brightness curve according to the working time being t.
  • FIG. 7 is a flow chart of step S40 of the brightness compensation method provided by the present application in a first embodiment.
  • the step S40 includes:
  • the standard brightness value is a compensation brightness value
  • the minimum brightness value is greater than the standard brightness value, the minimum brightness value is a compensated brightness value.
  • Figure 8 is a schematic diagram when the minimum brightness value is less than the standard brightness value.
  • Figure 9 is a schematic diagram when the minimum brightness value is greater than the standard brightness value. If the minimum brightness value is less than or equal to the standard brightness value, the standard brightness value is used as the compensation brightness value for compensation. After compensation, the actual life curve of the OLED display panel can reach the specified life specification. If the minimum brightness value is greater than the standard brightness value, and the minimum brightness value is higher than the standard brightness value, if the compensation brightness value is selected according to the standard brightness curve, the actual life at this time is a life curve that just meets the life specification. Although it can The life specification is met, but the compensation effect at this time is not optimal.
  • the current minimum brightness value of the OLED display panel can be used as the compensation brightness value for comprehensive compensation.
  • the remaining Each sub-pixel reduces the current to achieve the target brightness.
  • the brightness uniformity can be improved and the power consumption can be reduced.
  • the actual life of the OLED display panel is higher than the standard life specification.
  • Step S50 includes:
  • ⁇ L t /L, where L t is the compensation brightness value and L is the brightness value of the sub-pixel;
  • the compensated brightness value is obtained, the compensated brightness value is compared with the brightness value of the sub-pixel, and then the compensation coefficient is obtained, and then the driving electrical performance parameters of the sub-pixel are obtained. Since the driving electrical performance parameters and the brightness value have similar Corresponding relationship, therefore by multiplying the compensation coefficient and the driving electrical performance parameter, the compensated driving electrical performance parameter can be obtained, and finally the value of the driving electrical performance parameter of the sub-pixel is adjusted to the compensated driving electrical performance At this time, the brightness value of the sub-pixel can reach the compensation brightness value. All sub-pixels of the OLED display panel are compensated in the above manner, so that all sub-pixels of the OLED display panel have the same compensation brightness value. Make the brightness of the OLED display panel uniform.
  • the driving electrical performance parameter includes any one of a driving voltage and a driving current of the sub-pixel.
  • the driving electrical performance parameters can also be other parameters of the sub-pixel, such as power, resistance, etc., but since the driving voltage and driving current of the sub-pixel have a positive linear correlation with the brightness value of the sub-pixel, , can be easily set.
  • the compensation driving electrical performance parameter is the compensation driving voltage V t .
  • Figure 11 is a flow chart of a second embodiment of step S10 of the brightness compensation method provided by the present application.
  • the step S10 includes:
  • L 0 is the initial brightness value of the sub-pixel
  • P is the driving electrical performance parameter
  • c and d are the characteristic parameters of the organic light-emitting device of the sub-pixel.
  • Figure 12 is a flow chart of a second embodiment of step S40 of the brightness compensation method provided by the present application.
  • the step S40 includes:
  • the standard brightness value is a compensation brightness value
  • the minimum brightness value is greater than the standard brightness value, a maximum brightness value among the brightness values of all sub-pixels is obtained, and the maximum brightness value is a compensation brightness value.
  • the standard brightness value is used as the compensation brightness value for compensation. After compensation, the actual life curve of the OLED display panel can reach the specified life specification. If the minimum brightness value is greater than the standard brightness value, and the minimum brightness value is higher than the standard brightness value, if the compensation brightness value is selected according to the standard brightness curve, the actual life at this time is a life curve that just meets the life specification. Although it can The life specification is met, but the compensation effect at this time is not optimal.
  • the maximum brightness value of the brightness values of all sub-pixels is obtained, and the maximum brightness value of the current OLED display panel can be used as a comprehensive compensation.
  • Brightness value, at this time, all sub-pixels except the sub-pixel with the maximum brightness value increase the current to achieve the target brightness. After compensation, the brightness uniformity can be improved, and at the same time, the actual life of the OLED display panel can be higher than the standard life specification.
  • Figure 13 is a schematic diagram of a brightness compensation device provided by this application.
  • An embodiment of this application also provides a brightness compensation device, which includes: a brightness acquisition module 10, a brightness contrast module 20, a standard brightness module 30, and a compensation module. 40 and drive module 50.
  • the brightness acquisition module 10 is used to obtain the brightness value of each sub-pixel in all sub-pixels when the working time is t;
  • the brightness comparison module 20 is used to obtain the minimum brightness value among the brightness values of all sub-pixels;
  • the standard brightness module 30 is used to obtain the standard brightness value of the sub-pixel when the working time is t;
  • the compensation module 40 is used to compare the minimum brightness value with the standard brightness value to obtain a compensated brightness value; so
  • the driving module 50 is used to drive all sub-pixels according to the compensated brightness value.
  • All sub-pixels in this application are driven using compensated brightness values, thus making the brightness of the OLED display panel uniform.
  • this application drives all sub-pixels based on the compensated brightness value. It does not simply improve the brightness uniformity of the OLED display panel by increasing the driving current of the sub-pixels, thereby reducing the aging rate of the display device and extending its life.
  • Embodiments of the present application also provide a readable storage medium that stores a computer program that can be run on a processor, and the processor executes the computer program to implement the above brightness compensation method. steps in.
  • the readable storage medium may include a computer-readable storage medium such as a non-volatile memory or a non-transitory memory.
  • Storage media may include but are not limited to ROM, RAM, magnetic disks or optical disks, etc.
  • An embodiment of the present application also provides a display device.
  • the display device includes a processor, a memory, and a computer program stored in the memory and executable on the processor.
  • the processor executes the computer program to Implement the steps in the brightness adjustment method described above.
  • the processor can be a central processing unit (CPU for short).
  • the processor can also be other general-purpose processors or digital signal processors (DSP for short).
  • DSP digital signal processors
  • ASIC application specific integrated circuit
  • ASIC off-the-shelf programmable gate array
  • field programmable gate array field programmable gate array
  • FPGA field-programmable gate array
  • a general-purpose processor may be a microprocessor or the processor may be any conventional processor, etc.
  • non-volatile memory may be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory.
  • non-volatile memory can be read-only memory (ROM), programmable ROM (PROM), erasable programmable read-only memory (erasable PROM, EPROM) , electrically erasable programmable read-only memory (electrically EPROM, referred to as EEPROM) or flash memory.
  • Volatile memory can be random access memory (RAM), which is used as an external cache.
  • RAM random access memory
  • static random access memory static random access memory
  • DRAM dynamic random access memory
  • DRAM synchronous Dynamic random access memory
  • SDRAM synchronous Dynamic random access memory
  • DDR SDRAM double data rate synchronous dynamic random access memory
  • ESDRAM enhanced synchronous dynamic random access memory
  • SLDRAM Synchronously connect dynamic random access memory
  • DRAM direct memory bus random access memory
  • DRRAM direct rambus RAM

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Abstract

本申请公开一种亮度补偿方法及装置、可读存储介质、显示装置，本申请先通过获得所有子像素的亮度值，再获得所有子像素中老化程度最严重的子像素的亮度值，即为最小亮度值，然后将最小亮度值与标准亮度值进行对比获得补偿亮度值，再用补偿亮度值对所述所有子像素进行驱动，从而提高显示装置亮度的均匀性。

Description

亮度补偿方法及装置、可读存储介质、显示装置 技术领域
本申请涉及显示技术领域，具体涉及一种亮度补偿方法及装置、可读存储介质、显示装置。
背景技术
有机发光二极管(Organic Light Emitting Diode，OLED)属于一种电流型的有机发光器件，是通过载流子的注入和复合而致发光的现象，发光强度与注入的电流成正比。OLED在电场的作用下，阳极产生的空穴和阴极产生的电子就会发生移动，分别向空穴传输层和电子传输层注入，迁移到发光层。当二者在发光层相遇时，产生能量激子，从而激发发光分子最终产生可见光。目前，OLED显示面板已经应用到手机、平板等显示领域。
对于OLED显示面板而言，随着使用时间的增加，OLED的发光效率将会降低，即同样的驱动电流下，亮度将会降低，与此同时，由于各像素的OLED器件老化程度存在差异，将会导致亮度的不均匀性和色度的不均匀性。然而，现有的补偿方式是通过提高电流的方式对OLED进行亮度补偿，现有的补偿方式会提前预支了OLED的寿命，并不能从根本上增加OLED器件的寿命，反而加速了器件的老化。
技术问题
本申请提供一种亮度补偿方法及装置、可读存储介质、显示装置，以解决显示装置亮度不均以及加速老化的问题。
技术解决方案
本申请提供一种亮度补偿方法，其包括：
获取工作时长为t时所有子像素中每个子像素的亮度值；
获得所述所有子像素的亮度值中的最小亮度值；
获得工作时长为t时所述子像素的标准亮度值；
将所述最小亮度值与所述标准亮度值进行对比得到补偿亮度值；
根据所述补偿亮度值对所述所有子像素进行驱动。
可选的，在本申请一些实施例中，所述获取工作时长为t时所有子像素中 每个子像素的亮度值的步骤包括：
将所述子像素的工作时长t分为N个时间段，N大于或等于1；
获取所述子像素在每个所述时间段的驱动电流值I，一共获得所述子像素在所述N个时间段的N个驱动电流值，分别为I 1、I 2……I N；
将所述N个驱动电流值转换为电流应力值，从而得到N个电流应力值，分别为
stress I1、stress I2……stress IN，
stress IN＝a×stress ref，其中，stress ref为所述子像素在参考电流I ref时对应的电流应力值，a＝I N/I ref或a＝(I N/I ref) b，b为子像素的有机发光器件的特性参数；
将所述N个电流应力值相加得到累积值sum stress；
根据所述累积值sum stress得到所述子像素的亮度值L，
Figure PCTCN2022095097-appb-000001
其中，L 0为子像素的初始亮度值，β和τ为子像素的有机发光器件的特性参数。
可选的，在本申请一些实施例中，所述获取所述子像素在每个所述时间段的驱动电流值I的步骤包括：
获取所述子像素在每个时间段内的M个驱动电流值，M大于或等于1；
获得所述M个驱动电流值的平均驱动电流值，将所述平均驱动电流值作为所述子像素在每个所述时间段的驱动电流值I。
可选的，在本申请一些实施例中，所述获取工作时长为t时所有子像素中每个子像素的亮度值的步骤包括：
获取所述子像素的驱动电性能参数；
根据所述驱动电性能参数得到所述子像素的亮度值L，
L＝(c×P+d)×L 0
其中，L 0为子像素的初始亮度值，P为驱动电性能参数，c和d为子像素的有机发光器件的特性参数。
可选的，在本申请一些实施例中，所述获得工作时长为t时所述子像素的标准亮度值的步骤包括：
建立子像素的标准亮度曲线，标准亮度曲线为所述子像素的标准亮度和工作时长T的曲线图；
通过所述标准亮度曲线获得工作时长为t时所述子像素的标准亮度值。
可选的，在本申请一些实施例中，将所述最小亮度值与所述标准亮度值进行对比得到补偿亮度值的步骤包括：
将所述最小亮度值与所述标准亮度值进行对比；
如果所述最小亮度值小于或等于所述标准亮度值，则所述标准亮度值为补偿亮度值；
如果所述最小亮度值大于所述标准亮度值，则所述最小亮度值为补偿亮度值。
可选的，在本申请一些实施例中，将所述最小亮度值与所述标准亮度值进行对比得到补偿亮度值的步骤包括：
将所述最小亮度值与所述标准亮度值进行对比；
如果所述最小亮度值小于或等于所述标准亮度值，则所述标准亮度值为补偿亮度值；
如果所述最小亮度值大于所述标准亮度值，则获得所述所有子像素的亮度值中的最大亮度值，所述最大亮度值为补偿亮度值。
可选的，在本申请一些实施例中，所述根据所述补偿亮度值对所述所有子像素进行驱动的步骤包括：
根据所述补偿亮度值和所述子像素的亮度值之间的比值得到补偿系数α，
α＝L t/L，其中L t为补偿亮度值，L为子像素的亮度值；
获得工作时长为t时所述子像素的驱动电性能参数；
将所述补偿系数和所述驱动电性能参数相乘得到补偿驱动电性能参数；
将所述子像素的驱动电性能参数的值调整为所述补偿驱动电性能参数的值。
可选的，在本申请一些实施例中，所述驱动电性能参数包括所述子像素的驱动电压和驱动电流中的任一个。
相对应地，本申请还提供一种亮度补偿装置，其包括：
亮度获取模块，所述亮度获取模块用于获取工作时长为t时所有子像素中每个子像素的亮度值；
亮度对比模块，所述亮度对比模块用于获得所述所有子像素的亮度值中的最小亮度值；
标准亮度模块，所述标准亮度模块用于获得工作时长为t时所述子像素的标准亮度值；
补偿模块，所述补偿模块用于将所述最小亮度值与所述标准亮度值进行对比得到补偿亮度值；
驱动模块，所述驱动模块用于根据所述补偿亮度值对所述所有子像素进行驱动。
相对应地，本申请还提供一种可读存储介质，所述可读存储介质中存储有可在处理器上运行的计算机程序，所述处理器执行所述计算机程序以实现亮度补偿方法中的步骤；其中，所述亮度补偿方法包括：
获取工作时长为t时所有子像素中每个子像素的亮度值；
获得所述所有子像素的亮度值中的最小亮度值；
获得工作时长为t时所述子像素的标准亮度值；
将所述最小亮度值与所述标准亮度值进行对比得到补偿亮度值；
根据所述补偿亮度值对所述所有子像素进行驱动。
相对应地，本申请还提供一种显示装置，所述显示装置包括处理器、存储器以及存储于所述存储器中并可在所述处理器上运行的计算机程序，所述处理器执行所述计算机程序以实现亮度调节方法中的步骤；其中，所述亮度补偿方法包括：
获取工作时长为t时所有子像素中每个子像素的亮度值；
获得所述所有子像素的亮度值中的最小亮度值；
获得工作时长为t时所述子像素的标准亮度值；
将所述最小亮度值与所述标准亮度值进行对比得到补偿亮度值；
根据所述补偿亮度值对所述所有子像素进行驱动。
可选的，在本申请一些实施例中，所述获取工作时长为t时所有子像素中每个子像素的亮度值的步骤包括：
将所述子像素的工作时长t分为N个时间段，N大于或等于1；
获取所述子像素在每个所述时间段的驱动电流值I，一共获得所述子像素 在所述N个时间段的N个驱动电流值，分别为I 1、I 2……I N；
将所述N个驱动电流值转换为电流应力值，从而得到N个电流应力值，分别为
stress I1、stress I2……stress IN，
stress IN＝a×stress ref，其中，stress ref为所述子像素在参考电流I ref时对应的电流应力值，a＝I N/I ref或a＝(I N/I ref) b，b为子像素的有机发光器件的特性参数；
将所述N个电流应力值相加得到累积值sum stress；
根据所述累积值sum stress得到所述子像素的亮度值L，
Figure PCTCN2022095097-appb-000002
其中，L 0为子像素的初始亮度值，β和τ为子像素的有机发光器件的特性参数。
可选的，在本申请一些实施例中，所述获取所述子像素在每个所述时间段的驱动电流值I的步骤包括：
获取所述子像素在每个时间段内的M个驱动电流值，M大于或等于1；
获得所述M个驱动电流值的平均驱动电流值，将所述平均驱动电流值作为所述子像素在每个所述时间段的驱动电流值I。
可选的，在本申请一些实施例中，所述获取工作时长为t时所有子像素中每个子像素的亮度值的步骤包括：
获取所述子像素的驱动电性能参数；
根据所述驱动电性能参数得到所述子像素的亮度值L，
L＝(c×P+d)×L 0
其中，L 0为子像素的初始亮度值，P为驱动电性能参数，c和d为子像素的有机发光器件的特性参数。
可选的，在本申请一些实施例中，所述获得工作时长为t时所述子像素的标准亮度值的步骤包括：
建立子像素的标准亮度曲线，标准亮度曲线为所述子像素的标准亮度和工作时长T的曲线图；
通过所述标准亮度曲线获得工作时长为t时所述子像素的标准亮度值。
可选的，在本申请一些实施例中，将所述最小亮度值与所述标准亮度值进行对比得到补偿亮度值的步骤包括：
将所述最小亮度值与所述标准亮度值进行对比；
如果所述最小亮度值小于或等于所述标准亮度值，则所述标准亮度值为补偿亮度值；
如果所述最小亮度值大于所述标准亮度值，则所述最小亮度值为补偿亮度值。
可选的，在本申请一些实施例中，将所述最小亮度值与所述标准亮度值进行对比得到补偿亮度值的步骤包括：
将所述最小亮度值与所述标准亮度值进行对比；
如果所述最小亮度值小于或等于所述标准亮度值，则所述标准亮度值为补偿亮度值；
如果所述最小亮度值大于所述标准亮度值，则获得所述所有子像素的亮度值中的最大亮度值，所述最大亮度值为补偿亮度值。
可选的，在本申请一些实施例中，所述根据所述补偿亮度值对所述所有子像素进行驱动的步骤包括：
根据所述补偿亮度值和所述子像素的亮度值之间的比值得到补偿系数α，
α＝L t/L，其中L t为补偿亮度值，L为子像素的亮度值；
获得工作时长为t时所述子像素的驱动电性能参数；
将所述补偿系数和所述驱动电性能参数相乘得到补偿驱动电性能参数；
将所述子像素的驱动电性能参数的值调整为所述补偿驱动电性能参数的值。
可选的，在本申请一些实施例中，所述驱动电性能参数包括所述子像素的驱动电压和驱动电流中的任一个。
有益效果
本申请提供一种亮度补偿方法及装置、可读存储介质、显示装置，其中亮度补偿方法包括：获取工作时长为t时所有子像素中每个子像素的亮度值；获得所述所有子像素的亮度值中的最小亮度值；获得工作时长为t时所述子像素的标准亮度值；将所述最小亮度值与所述标准亮度值进行对比得到补偿亮度值；根据所述补偿亮度值对所述所有子像素进行驱动。本申请先通过获得所有子像 素的亮度值，再获得所有子像素中老化程度最严重的子像素的亮度值，即为最小亮度值，然后将最小亮度值与标准亮度值进行对比获得补偿亮度值，再用补偿亮度值对所述所有子像素进行驱动，从而提高显示装置亮度的均匀性，同时降低显示装置的老化速度并延长寿命。
附图说明
为了更清楚地说明本申请实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图得到其他的附图。
图1为本申请提供的亮度补偿方法的流程图；
图2为子像素的实际亮度曲线图；
图3为本申请提供的亮度补偿方法的步骤S10第一实施例的流程图；
图4为本申请提供的亮度补偿方法的步骤S12的流程图；
图5为本申请提供的亮度补偿方法的步骤S30的流程图；
图6为子像素的标准亮度曲线图；
图7为本申请提供的亮度补偿方法的步骤S40第一实施例的流程图；
图8为最小亮度值小于所述标准亮度值的示意图；
图9为最小亮度值大于所述标准亮度值的示意图；
图10为本申请提供的亮度补偿方法的步骤S50的流程图；
图11为本申请提供的亮度补偿方法的步骤S10第二实施例的流程图；
图12为本申请提供的亮度补偿方法的步骤S40第二实施例的流程图；
图13为本申请提供的亮度补偿装置的示意图。
本发明的实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域技术人员在没有作出创造性劳动前提下所得到的所有其他实施例，都属于本申请保护的范围。
在本申请的描述中，需要理解的是，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数 量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括一个或者更多个所述特征。在本申请的描述中，“多个”的含义是两个或两个以上，除非另有明确具体的限定。
本申请提供一种亮度补偿方法及装置、可读存储介质、显示装置，以下进行详细说明。需要说明的是，本申请实施例所提供的亮度补偿方法可应用于具有如下结构的显示装置中：该显示装置为自发光显示装置，例如，OLED显示装置，该显示装置包括多个子像素，每个子像素均包括一有机发光器件。以下实施例的描述顺序不作为对本申请实施例优选顺序的限定。
请参阅图1，图1为本申请提供的亮度补偿方法的流程图。本申请提供一种亮度补偿方法，其包括以下步骤：
S10、获取工作时长为t时所有子像素中每个子像素的亮度值。
由于OLED显示面板随着使用时间的增加，OLED显示面板的有机发光器件的发光效率将会降低，即同样的驱动电流下，有机发光器件的亮度将会降低，也即是有机发光器件发生老化，因此获取子像素在不同工作时长时的亮度值，该亮度值可以体现有机发光器件的老化程度。一般而言，OLED显示面板的子像素的初始亮度为1，即工作时长为零时，OLED显示面板的子像素的亮度值为1，随着工作时长的增加，OLED显示面板的子像素的亮度值会低于1，并位于0至1的区间。
S20、获得所述所有子像素的亮度值中的最小亮度值。
在获取OLED显示面板在工作时长为t时所有子像素中每个子像素的亮度值后，通过对比所有子像素的亮度值得到所有子像素的亮度值中的最小亮度值。请参考图2，图2为子像素的实际亮度曲线图，可以将每次每个子像素的亮度值统计累积形成实际亮度曲线。
S30、获得工作时长为t时所述子像素的标准亮度值。
具体地，所述子像素包括红光子像素、绿光子像素、蓝光子像素和白光子像素，对应地，所述子像素的标准亮度值可以为所述红光子像素的标准亮度值、所述绿光子像素的标准亮度值、所述蓝光子像素的标准亮度值和所述白光子像素的标准亮度值中的任一个，或者，所述红光子像素、所述绿光子像素、所述蓝光子像素和所述白光子像素采用共同的标准亮度值，可以根据具体需要进行设定。由于OLED显示面板随着使用时间的增加，OLED显示面板的有机发光 器件的发光效率将会降低，即同样的驱动电流下，有机发光器件的亮度将会降低，也即是有机发光器件发生老化，因此为了体现有机发光器件标准的老化情况，在有机发光器件工作时长为t时，有机发光器件在同样的驱动电流下具有相应的标准亮度值，当工作时长为t时，子像素的亮度值大于标准亮度值时，则说明该子像素老化速度比标准老化速度慢，子像素的亮度值小于标准亮度值时，则说明该子像素老化速度比标准老化速度快。
S40、将所述最小亮度值与所述标准亮度值进行对比得到补偿亮度值。
将所述最小亮度值与所述标准亮度值进行对比得到OLED显示面板的子像素的老化情况。然后根据老化情况来决定补偿亮度值。
S50、根据所述补偿亮度值对所述所有子像素进行驱动。
由上可知，OLED显示面板的子像素的初始亮度为1，则补偿亮度值位于0至1区间，通过将补偿亮度值转化为驱动电性能参数，然后将驱动电性能参数设为子像素的电性能参数，则能对子像素进行驱动。由于所有子像素都采用补偿亮度值进行驱动，因此使得OLED显示面板的亮度均匀。同时本申请是根据补偿亮度值对所有子像素进行驱动，并不只是单纯通过提高子像素的驱动电流改善OLED显示面板的亮度均匀性，从而降低显示装置的老化速度并延长寿命。
其中，需要说明的是，上述过程中使用步骤S10、S20、S30、S40和S50对本申请亮度补偿方法的过程进行说明只是为了便于对方法过程理解，并不是对本申请亮度补偿方法的具体步骤顺序的限定，本申请亮度补偿方法也可以具有其他可以实现本申请发明目的的步骤顺序，在此不做限定。
在一些实施例中，请参考图3，图3为本申请提供的亮度补偿方法的步骤S10第一实施例的流程图，所述S10包括：
S11、将所述子像素的工作时长t分为N个时间段，N大于或等于1。
所述子像素的工作时长t分为N个时间段，N个时间段可以是N个相等时长的时间段，也可以是N个互不相等时长的时间段，N个时间段也可以包括多个相等时长的时间段。
S12、获取所述子像素在每个所述时间段的驱动电流值I，一共获得所述子像素在所述N个时间段的N个驱动电流值，分别为I 1、I 2……I N。
S13、将所述N个驱动电流值转换为电流应力值，从而得到N个电流应力 值，分别为stress I1、stress I2……stress IN，
stress IN＝a×stress ref，其中，stress ref为所述子像素在参考电流I ref时对应的电流应力值，a＝I N/I ref或a＝(I N/I ref) b，b为子像素的有机发光器件的特性参数。
S14、将所述N个电流应力值相加得到累积值sum stress。
S15、根据所述累积值sum stress得到所述子像素的亮度值L，
Figure PCTCN2022095097-appb-000003
其中，L 0为子像素的初始亮度值，β和τ为子像素的有机发光器件的特性参数。
下面以N个时间段可以是N个相等时长的时间段为例，对S10步骤进行举例说明：工作时长t为150小时，将150小时分为10个相等时长的时间段，则10个时间段分别为：第一时间段为0至第15小时、第二时间段为第15小时至第30小时、第三时间段为第30小时至第45小时、第四时间段为第45小时至第60小时、第五时间段为第60小时至第75小时、第六时间段为第75小时至第90小时、第七时间段为第90小时至第105小时、第八时间段为第105小时至第120小时、第九时间段为第120小时至第135小时、第十时间段为第135小时至第150小时。也即是获取所述子像素在每个所述时间段中的驱动电流值I，一共N个时间段的N个驱动电流值，则获得所述子像素在第一时间段的驱动电流值I 1，在第二时间段的驱动电流值I 2，在第三时间段的驱动电流值I 3，在第四时间段的驱动电流值I 4，在第五时间段的驱动电流值I 5，在第六时间段的驱动电流值I 6，在第七时间段的驱动电流值I 7，在第八时间段的驱动电流值I 8，在第九时间段的驱动电流值I 9，在第十时间段的驱动电流值I 10。将上述10个驱动电流值转换为电流应力值得到10个电流应力值，分别为stress I1、stress I2、stress I3、stress I4、stress I5、stress I6、stress I7、stress I8、stress I9、。将上述10个电流应力值相加得到累积值，此时，sum stress＝stress I1+stress I2+stress I3+stress I4+stress I5+stress I6+stress I7+stress I8+stress I9+stress I10。
最后，由于OLED显示面板的子像素的初始亮度为1，则所述子像素的亮度值
Figure PCTCN2022095097-appb-000004
在一些实施例中，请参考图4，图4为本申请提供的亮度补偿方法的步骤S12的流程图，所述S12包括：
S121、获取所述子像素在每个时间段内的M个驱动电流值，M大于或等于1；
S122、获得所述M个驱动电流值的平均驱动电流值，将所述平均驱动电流值作为所述子像素在每个所述时间段的驱动电流值I。
当工作时长为150小时，将150小时分为10个相等时长的时间段，获得子像素在第一时间段内的5个驱动电流值，然后求得5个驱动电流值的平均驱动电流值，则该平均驱动电流值为所述子像素在第一时间段的驱动电流值I 1，以此类推，其余时间段内的驱动电流值依照上述方式获得。通过获取子像素在每个时间段内的M个驱动电流值，再求得M个驱动电流值的平均驱动电流值，可以提高驱动电流值的准确性。需要说明的是，每个时间段内M的取值可以相同也可以不相同，每个时间段可以根据实际需要选定M的值。
在一些实施例中，请参考图5，图5为本申请提供的亮度补偿方法的步骤S30的流程图，所述S30包括：
S31、建立子像素的标准亮度曲线，标准亮度曲线为所述子像素的标准亮度和工作时长T的曲线图；
S32、通过所述标准亮度曲线获得工作时长为t时所述子像素的标准亮度值。
具体地，所述子像素的标准亮度曲线包括红光子像素的标准亮度曲线、绿光子像素的标准亮度曲线、蓝光子像素的标准亮度曲线和白光子像素的标准亮度曲线中的任一种，或者，也可以为所述红光子像素、所述绿光子像素、所述蓝光子像素和所述白光子像素具有共同的的标准亮度曲线。请参考图6，图6为子像素的标准亮度曲线图，标准亮度曲线为随着工作时长的增加而子像素的标准亮度会逐渐下降的过程，标准亮度曲线可在显示装置出厂前存储在其存储器中，标准亮度曲线也可以储存在服务器或云端。在一些实施例中，所提供的亮度补偿方法还包括建立子像素的标准亮度曲线的步骤，该步骤包括如下过程：测试子像素在不同工作时长下的标准亮度，得到至少两组工作时长与标准亮度值的对应关系数据；根据测试得到的所述至少两组工作时长与标准亮度值的对应关系数据进行拟合，得到标准亮度曲线。其中，所进行的拟合可为一次函数 拟合。测试得到的工作时长与标准亮度值的对应关系数据的组数可根据实际需要选定，组数越多，最终得到的标准亮度曲线越准确。当需要获取工作时长为t时所述子像素的标准亮度值时，只需要在标准亮度曲线上根据工作时长为t即可找到对应的标准亮度值。
在一些实施例中，请参考图7，图7为本申请提供的亮度补偿方法的步骤S40第一实施例的流程图，所述S40步骤包括：
S41、将所述最小亮度值与所述标准亮度值进行对比；
S42、如果所述最小亮度值小于或等于所述标准亮度值，则所述标准亮度值为补偿亮度值；
如果所述最小亮度值大于所述标准亮度值，则所述最小亮度值为补偿亮度值。
请参考图8和图9，图8为最小亮度值小于所述标准亮度值的示意图，图9为最小亮度值大于所述标准亮度值的示意图。如果所述最小亮度值小于或等于所述标准亮度值，以标准亮度值为补偿亮度值进行补偿，补偿后OLED显示面板的实际寿命曲线可达到制定的寿命规格。如果所述最小亮度值大于所述标准亮度值，最小亮度值高于标准亮度值，此时若按照标准亮度曲线选取补偿亮度值，此时的实际寿命为刚好满足寿命规格的寿命曲线，虽然可以满足寿命规格，但此时的补偿效果非最佳状态。因此，当OLED显示面板子像素的最小亮度值高于标准亮度值时，可将当前OLED显示面板的最小亮度值作为全面补偿的补偿亮度值，此时，除最小亮度值的子像素外的其余子像素均降低电流以达到目标亮度，补偿后可实现亮度均匀性的提升且功耗的下降，同时使得OLED显示面板的实际寿命高于标准寿命规格。
在一些实施例中，请参考图10，图10为本申请提供的亮度补偿方法的步骤S50的流程图，所述S50步骤包括：
S51、根据所述补偿亮度值和所述子像素的亮度值之间的比值得到补偿系数α，
α＝L t/L，其中L t为补偿亮度值，L为子像素的亮度值；
S52、获得工作时长为t时所述子像素的驱动电性能参数；
S53、将所述补偿系数和所述驱动电性能参数相乘得到补偿驱动电性能参数；
S54、将所述子像素的驱动电性能参数的值调整为所述补偿驱动电性能参数的值。
当获得补偿亮度值后，将所述补偿亮度值和所述子像素的亮度值进行对比，然后得到补偿系数，接着再得到子像素的驱动电性能参数，由于驱动电性能参数和亮度值具有相对应的关系，因此通过将所述补偿系数和所述驱动电性能参数相乘即可得到补偿驱动电性能参数，最后将所述子像素的驱动电性能参数的值调整为所述补偿驱动电性能参数的值，此时该子像素的亮度值即可达到补偿亮度值，对OLED显示面板的所有子像素都采用上述方式进行补偿，从而实现OLED显示面板的所有子像素具有同一个补偿亮度值，使得OLED显示面板亮度均匀。
此外，在一些实施例中，所述驱动电性能参数包括所述子像素的驱动电压和驱动电流中的任一个。当然容易想到的是，驱动电性能参数也可以为所述子像素的其他参数，例如功率、电阻等，但是由于子像素的驱动电压和驱动电流为与子像素的亮度值具有正线性相关的关系，能够方便设置。
当驱动电性能参数为驱动电流时，补偿驱动电性能参数则为补偿驱动电流I t，I t＝α×I，根据所述补偿亮度值和所述子像素的亮度值计算获得补偿系数，并根据补偿系数对电流进行调整，从而对亮度进行补偿。
当驱动电性能参数为驱动电压时，补偿驱动电性能参数则为补偿驱动电压V t，先通过公式获得补偿驱动电流I t＝α×I，再根据公式I＝k(Vgs-Vth) 2获得补偿驱动电压，其中Vgs为子像素的晶体管的栅极和源极的压差，Vth为子像素的晶体管的阈值电压，从而对亮度进行补偿。
在本申请的另一些实施例中，请参考图11，图11为本申请提供的亮度补偿方法的步骤S10第二实施例的流程图，所述S10步骤包括：
S16、获取所述子像素的驱动电性能参数；
S17、根据所述驱动电性能参数得到所述子像素的亮度值L，
L＝(c×P+d)×L 0
其中，L 0为子像素的初始亮度值，P为驱动电性能参数，c和d为子像素的有机发光器件的特性参数。
另外，所述驱动电性能参数包括所述子像素的驱动电压和驱动电流中的任 一个，子像素的初始亮度值为1，则L＝c×P+d。也即是本申请在一些实施例中，通过获得子像素的驱动电性能参数后，即可计算出子像素的亮度值，过程高效便捷。
在本申请的另一些实施例中，请参考图12，图12为本申请提供的亮度补偿方法的步骤S40第二实施例的流程图，所述S40步骤包括：
S43、将所述最小亮度值与所述标准亮度值进行对比；
S44、如果所述最小亮度值小于或等于所述标准亮度值，则所述标准亮度值为补偿亮度值；
如果所述最小亮度值大于所述标准亮度值，则获得所述所有子像素的亮度值中的最大亮度值，所述最大亮度值为补偿亮度值。
请参考图8和图9，如果所述最小亮度值小于或等于所述标准亮度值，以标准亮度值为补偿亮度值进行补偿，补偿后OLED显示面板的实际寿命曲线可达到制定的寿命规格。如果所述最小亮度值大于所述标准亮度值，最小亮度值高于标准亮度值，此时若按照标准亮度曲线选取补偿亮度值，此时的实际寿命为刚好满足寿命规格的寿命曲线，虽然可以满足寿命规格，但此时的补偿效果非最佳状态。因此，当OLED显示面板子像素的最小亮度值高于标准亮度值时，则获得所述所有子像素的亮度值中的最大亮度值，可将当前OLED显示面板的最大亮度值作为全面补偿的补偿亮度值，此时，除最大亮度值的子像素外的其余子像素均提高电流以达到目标亮度，补偿后可实现亮度均匀性的提升，同时使得OLED显示面板的实际寿命高于标准寿命规格。
请参考图13，图13为本申请提供的亮度补偿装置的示意图，本申请实施例还提供一种亮度补偿装置，其包括：亮度获取模块10、亮度对比模块20、标准亮度模块30、补偿模块40和驱动模块50。
其中，所述亮度获取模块10用于获取工作时长为t时所有子像素中每个子像素的亮度值；所述亮度对比模块20用于获得所述所有子像素的亮度值中的最小亮度值；所述标准亮度模块30用于获得工作时长为t时所述子像素的标准亮度值；所述补偿模块40用于将所述最小亮度值与所述标准亮度值进行对比得到补偿亮度值；所述驱动模块50用于根据所述补偿亮度值对所述所有子像素进行驱动。
本申请的所有子像素都采用补偿亮度值进行驱动，因此使得OLED显示面板的亮度均匀。同时本申请是根据补偿亮度值对所有子像素进行驱动，并不只是单纯通过提高子像素的驱动电流改善OLED显示面板的亮度均匀性，从而降低显示装置的老化速度并延长寿命。
本申请实施例还提供了一种可读存储介质，所述可读存储介质中存储有可在处理器上运行的计算机程序，所述处理器执行所述计算机程序以实现上述所述亮度补偿方法中的步骤。优选地，可读存储介质可以包括诸如非挥发性(non-volatile)存储器或者非瞬态(non-transitory)存储器等计算机可读存储介质。存储介质可以包括但不限于ROM、RAM、磁盘或光盘等。
本申请实施例还提供一种显示装置，所述显示装置包括处理器、存储器以及存储于所述存储器中并可在所述处理器上运行的计算机程序，所述处理器执行所述计算机程序以实现上述所述亮度调节方法中的步骤。
具体地，在本申请实施例中所述处理器可以为中央处理单元(centra processing unit，简称CPU)，该处理器还可以是其他通用处理器、数字信号处理器(digital signal processor，简称DSP)、专用集成电路(application specific integrated circuit，简称ASIC)、现成可编程门阵列(field programmable gate array，
简称FPGA)或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件等。通用处理器可以是微处理器或者该处理器也可以是任何常规的处理器等。
还应理解，本申请实施例中的存储器可以是易失性存储器或非易失性存储器，或可包括易失性和非易失性存储器两者。其中，非易失性存储器可以是只读存储器(read-only memory，简称ROM)、可编程只读存储器(programmable ROM，简称PROM)、可擦除可编程只读存储器(erasable PROM，简称EPROM)、电可擦除可编程只读存储器(electrically EPROM，简称EEPROM)或闪存。易失性存储器可以是随机存取存储器(random accessmemory，简称RAM)，其用作外部高速缓存。通过示例性但不是限制性说明，许多形式的随机存取存储器(random access memory，简称RAM)可用，例如静态随机存取存储器(static RAM，简称SRAM)、动态随机存取存储器(DRAM)、同步动态随机存取存储器(synchronous DRAM，简称SDRAM)、双倍数据速率同步动态随机存取存储器 (double data rate SDRAM，简称DDR SDRAM)、增强型同步动态随机存取存储器(enhanced SDRAM，简称ESDRAM)、同步连接动态随机存取存储器(synchlink DRAM，简称SLDRAM)和直接内存总线随机存取存储器(direct rambus RAM，简称DRRAM)。
以上对本申请实施例所提供的一种亮度补偿方法及装置、可读存储介质、显示装置进行了详细介绍，本文中应用了具体个例对本申请的原理及实施方式进行了阐述，以上实施例的说明只是用于帮助理解本申请的方法及其核心思想；同时，对于本领域的技术人员，依据本申请的思想，在具体实施方式及应用范围上均会有改变之处，综上，本说明书内容不应理解为对本申请的限制。

Claims (20)

  1. 一种亮度补偿方法，其中，包括：
    获取工作时长为t时所有子像素中每个子像素的亮度值；
    获得所述所有子像素的亮度值中的最小亮度值；
    获得工作时长为t时所述子像素的标准亮度值；
    将所述最小亮度值与所述标准亮度值进行对比得到补偿亮度值；
    根据所述补偿亮度值对所述所有子像素进行驱动。
  2. 根据权利要求1所述的亮度补偿方法，其中，所述获取工作时长为t时所有子像素中每个子像素的亮度值的步骤包括：
    将所述子像素的工作时长t分为N个时间段，N大于或等于1；
    获取所述子像素在每个所述时间段的驱动电流值I，一共获得所述子像素在所述N个时间段的N个驱动电流值，分别为I 1、I 2……I N；
    将所述N个驱动电流值转换为电流应力值，从而得到N个电流应力值，分别为
    stress I1、stress I2……stress IN，
    stress IN＝a×stress ref，其中，stress ref为所述子像素在参考电流I ref时对应的电流应力值，a＝I N/I ref或a＝(I N/I ref) b，b为子像素的有机发光器件的特性参数；
    将所述N个电流应力值相加得到累积值sum stress；
    根据所述累积值sum stress得到所述子像素的亮度值L，
    Figure PCTCN2022095097-appb-100001
    其中，L 0为子像素的初始亮度值，β和τ为子像素的有机发光器件的特性参数。
  3. 根据权利要求2所述的亮度补偿方法，其中，所述获取所述子像素在每个所述时间段的驱动电流值I的步骤包括：
    获取所述子像素在每个时间段内的M个驱动电流值，M大于或等于1；
    获得所述M个驱动电流值的平均驱动电流值，将所述平均驱动电流值作为所述子像素在每个所述时间段的驱动电流值I。
  4. 根据权利要求1所述的亮度补偿方法，其中，所述获取工作时长为t时所有子像素中每个子像素的亮度值的步骤包括：
    获取所述子像素的驱动电性能参数；
    根据所述驱动电性能参数得到所述子像素的亮度值L，
    L＝(c×P+d)×L 0
    其中，L 0为子像素的初始亮度值，P为驱动电性能参数，c和d为子像素的有机发光器件的特性参数。
  5. 根据权利要求1所述的亮度补偿方法，其中，所述获得工作时长为t时所述子像素的标准亮度值的步骤包括：
    建立子像素的标准亮度曲线，标准亮度曲线为所述子像素的标准亮度和工作时长T的曲线图；
    通过所述标准亮度曲线获得工作时长为t时所述子像素的标准亮度值。
  6. 根据权利要求1所述的亮度补偿方法，其中，将所述最小亮度值与所述标准亮度值进行对比得到补偿亮度值的步骤包括：
    将所述最小亮度值与所述标准亮度值进行对比；
    如果所述最小亮度值小于或等于所述标准亮度值，则所述标准亮度值为补偿亮度值；
    如果所述最小亮度值大于所述标准亮度值，则所述最小亮度值为补偿亮度值。
  7. 根据权利要求1所述的亮度补偿方法，其中，将所述最小亮度值与所述标准亮度值进行对比得到补偿亮度值的步骤包括：
    将所述最小亮度值与所述标准亮度值进行对比；
    如果所述最小亮度值小于或等于所述标准亮度值，则所述标准亮度值为补偿亮度值；
    如果所述最小亮度值大于所述标准亮度值，则获得所述所有子像素的亮度值中的最大亮度值，所述最大亮度值为补偿亮度值。
  8. 根据权利要求1所述的亮度补偿方法，其中，所述根据所述补偿亮度值对所述所有子像素进行驱动的步骤包括：
    根据所述补偿亮度值和所述子像素的亮度值之间的比值得到补偿系数α，
    α＝L t/L，其中L t为补偿亮度值，L为子像素的亮度值；
    获得工作时长为t时所述子像素的驱动电性能参数；
    将所述补偿系数和所述驱动电性能参数相乘得到补偿驱动电性能参数；
    将所述子像素的驱动电性能参数的值调整为所述补偿驱动电性能参数的值。
  9. 根据权利要求8所述的亮度补偿方法，其中，所述驱动电性能参数包括所述子像素的驱动电压和驱动电流中的任一个。
  10. 一种亮度补偿装置，其中，包括：
    亮度获取模块，所述亮度获取模块用于获取工作时长为t时所有子像素中每个子像素的亮度值；
    亮度对比模块，所述亮度对比模块用于获得所述所有子像素的亮度值中的最小亮度值；
    标准亮度模块，所述标准亮度模块用于获得工作时长为t时所述子像素的标准亮度值；
    补偿模块，所述补偿模块用于将所述最小亮度值与所述标准亮度值进行对比得到补偿亮度值；
    驱动模块，所述驱动模块用于根据所述补偿亮度值对所述所有子像素进行驱动。
  11. 一种可读存储介质，其中，所述可读存储介质中存储有可在处理器上运行的计算机程序，所述处理器执行所述计算机程序以实现亮度补偿方法中的步骤；其中，所述亮度补偿方法包括：
    获取工作时长为t时所有子像素中每个子像素的亮度值；
    获得所述所有子像素的亮度值中的最小亮度值；
    获得工作时长为t时所述子像素的标准亮度值；
    将所述最小亮度值与所述标准亮度值进行对比得到补偿亮度值；
    根据所述补偿亮度值对所述所有子像素进行驱动。
  12. 一种显示装置，其中，所述显示装置包括处理器、存储器以及存储于所述存储器中并可在所述处理器上运行的计算机程序，所述处理器执行所述计算机程序以实现亮度调节方法中的步骤；其中，所述亮度补偿方法包括：
    获取工作时长为t时所有子像素中每个子像素的亮度值；
    获得所述所有子像素的亮度值中的最小亮度值；
    获得工作时长为t时所述子像素的标准亮度值；
    将所述最小亮度值与所述标准亮度值进行对比得到补偿亮度值；
    根据所述补偿亮度值对所述所有子像素进行驱动。
  13. 根据权利要求12所述的显示装置，其中，所述获取工作时长为t时所有子像素中每个子像素的亮度值的步骤包括：
    将所述子像素的工作时长t分为N个时间段，N大于或等于1；
    获取所述子像素在每个所述时间段的驱动电流值I，一共获得所述子像素在所述N个时间段的N个驱动电流值，分别为I 1、I 2……I N；
    将所述N个驱动电流值转换为电流应力值，从而得到N个电流应力值，分别为
    stress I1、stress I2……stress IN，
    stress IN＝a×stress ref，其中，stress ref为所述子像素在参考电流I ref时对应的电流应力值，a＝I N/I ref或a＝(I N/I ref) b，b为子像素的有机发光器件的特性参数；
    将所述N个电流应力值相加得到累积值sum stress；
    根据所述累积值sum stress得到所述子像素的亮度值L，
    Figure PCTCN2022095097-appb-100002
    其中，L 0为子像素的初始亮度值，β和τ为子像素的有机发光器件的特性参数。
  14. 根据权利要求13所述的显示装置，其中，所述获取所述子像素在每个所述时间段的驱动电流值I的步骤包括：
    获取所述子像素在每个时间段内的M个驱动电流值，M大于或等于1；
    获得所述M个驱动电流值的平均驱动电流值，将所述平均驱动电流值作为所述子像素在每个所述时间段的驱动电流值I。
  15. 根据权利要求12所述的显示装置，其中，所述获取工作时长为t时所有子像素中每个子像素的亮度值的步骤包括：
    获取所述子像素的驱动电性能参数；
    根据所述驱动电性能参数得到所述子像素的亮度值L，
    L＝(c×P+d)×L 0
    其中，L 0为子像素的初始亮度值，P为驱动电性能参数，c和d为子像素的 有机发光器件的特性参数。
  16. 根据权利要求12所述的显示装置，其中，所述获得工作时长为t时所述子像素的标准亮度值的步骤包括：
    建立子像素的标准亮度曲线，标准亮度曲线为所述子像素的标准亮度和工作时长T的曲线图；
    通过所述标准亮度曲线获得工作时长为t时所述子像素的标准亮度值。
  17. 根据权利要求12所述的显示装置，其中，将所述最小亮度值与所述标准亮度值进行对比得到补偿亮度值的步骤包括：
    将所述最小亮度值与所述标准亮度值进行对比；
    如果所述最小亮度值小于或等于所述标准亮度值，则所述标准亮度值为补偿亮度值；
    如果所述最小亮度值大于所述标准亮度值，则所述最小亮度值为补偿亮度值。
  18. 根据权利要求12所述的显示装置，其中，将所述最小亮度值与所述标准亮度值进行对比得到补偿亮度值的步骤包括：
    将所述最小亮度值与所述标准亮度值进行对比；
    如果所述最小亮度值小于或等于所述标准亮度值，则所述标准亮度值为补偿亮度值；
    如果所述最小亮度值大于所述标准亮度值，则获得所述所有子像素的亮度值中的最大亮度值，所述最大亮度值为补偿亮度值。
  19. 根据权利要求12所述的显示装置，其中，所述根据所述补偿亮度值对所述所有子像素进行驱动的步骤包括：
    根据所述补偿亮度值和所述子像素的亮度值之间的比值得到补偿系数α，
    α＝L t/L，其中L t为补偿亮度值，L为子像素的亮度值；
    获得工作时长为t时所述子像素的驱动电性能参数；
    将所述补偿系数和所述驱动电性能参数相乘得到补偿驱动电性能参数；
    将所述子像素的驱动电性能参数的值调整为所述补偿驱动电性能参数的值。
  20. 根据权利要求19所述的显示装置，其中，所述驱动电性能参数包括所述子像素的驱动电压和驱动电流中的任一个。
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