WO2019029070A1 - 一种amoled显示面板亮度补偿方法及装置 - Google Patents

一种amoled显示面板亮度补偿方法及装置 Download PDF

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WO2019029070A1
WO2019029070A1 PCT/CN2017/115594 CN2017115594W WO2019029070A1 WO 2019029070 A1 WO2019029070 A1 WO 2019029070A1 CN 2017115594 W CN2017115594 W CN 2017115594W WO 2019029070 A1 WO2019029070 A1 WO 2019029070A1
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module
compensation
brightness
display panel
gray scale
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PCT/CN2017/115594
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English (en)
French (fr)
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邓宇帆
许神贤
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深圳市华星光电半导体显示技术有限公司
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Priority to US15/736,311 priority Critical patent/US10593259B2/en
Publication of WO2019029070A1 publication Critical patent/WO2019029070A1/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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/2007—Display of intermediate tones
    • 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
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
    • 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
    • G09G2320/0285—Improving the quality of display appearance using tables for spatial correction of display data
    • 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
    • G09G2320/04—Maintaining the quality of display appearance
    • G09G2320/043—Preventing or counteracting the effects of ageing
    • G09G2320/045—Compensation of drifts in the characteristics of light emitting or modulating elements
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/04—Maintaining the quality of display appearance
    • G09G2320/043—Preventing or counteracting the effects of ageing
    • G09G2320/048—Preventing or counteracting the effects of ageing using evaluation of the usage time
    • 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
    • G09G2330/12—Test circuits or failure detection circuits included in a display system, as permanent part thereof

Definitions

  • the invention relates to a panel display technology, in particular to a method and a device for brightness compensation of an AMOLED display panel.
  • OLED Organic Light-Emitting Diode
  • OLED display devices can be classified into passive matrix type (Passive Matrix OLED, PMOLED) and active matrix type (Active Matrix OLED, AMOLED) according to the driving method, that is, direct addressing and Thin Film Transistor (TFT).
  • PMOLED Passive Matrix OLED
  • AMOLED Active Matrix OLED
  • TFT Thin Film Transistor
  • matrix addressing There are two types of matrix addressing. Among them, the AMOLED has pixels arranged in an array, belongs to an active display type, has high luminous efficiency, and is generally used as a high-definition large-sized display device.
  • organic electroluminescent diode display devices have spatial and temporal non-uniformity problems, and as the size of display devices becomes larger, such problems are exposed more and more, thus solving large-size OLEDs.
  • Display display non-uniformity has become one of the key technologies in production.
  • the display unevenness of the OLED display device is closely related to the fabrication process.
  • the value of the threshold voltage on the entire panel is largely different, the brightness uniformity of the entire display device is deteriorated.
  • the external circuit and image processing method to improve the lifetime of the OLED display it is first necessary to determine the degree of brightness attenuation of the OLED display.
  • the anodic voltage of the OLED display is detected in real time by an external detection circuit to determine the degree of attenuation, and the brightness attenuation degree of the OLED display cannot be directly determined according to the gradation value and display time of the image displayed by the OLED display.
  • this method can determine the aging state of the TFT, but cannot determine the aging state of the OLED light-emitting device; and, this method requires adding a measuring circuit to the panel.
  • the invention provides an AMOLED display panel brightness compensation device to solve the problem of brightness degradation of an AMOLED display panel.
  • the invention provides a method for compensating brightness of an AMOLED display panel, characterized in that the method comprises the steps of:
  • Step S20 converting the video signal received in the input module into an original gray level recognized by the correction module
  • Step S30 input the original gray scale to the correction module, and the correction module corrects the original gray scale according to a dynamic compensation table;
  • Step S40 transmitting the corrected original gray scale to the display module and the operation module;
  • Step S50 In the operation module, calculate an attenuation rule according to the corrected original gray scale, and modify the dynamic compensation table with time.
  • the method before the step S20, the method further includes:
  • Step S10 Calculate compensation data, and generate the dynamic compensation table, wherein the dynamic compensation table includes a one-to-one correspondence between at least one of a pixel brightness reduction value, a gray level current value, and a time and the compensation data.
  • the step S10 includes:
  • Step S101 performing an aging experiment on the pre-selected AMOLED display panel to obtain experimental data
  • f is the brightness attenuation ratio
  • f corresponds to the compensation data
  • k is the pixel brightness reduction value per unit time and unit current
  • gray(t) is the gray level current value at time t
  • ⁇ is the preselected AMOLED display panel
  • the gamma coefficient, t is time.
  • the step S30 includes:
  • the calibration module corrects the original grayscale x according to the compensation data and a correction formula x/(1-f) 1/ ⁇ ;
  • x is the original gray level and f is the brightness attenuation ratio.
  • the step S30 includes:
  • the dynamic compensation table receives the brightness attenuation ratio of the display panel sent by the operation module, adding the received value to the original value stored in the dynamic compensation table as an updated brightness attenuation ratio, and The corrected result is transmitted to the display module.
  • the invention provides an AMOLED display panel brightness compensation device, the compensation device comprises a compensation circuit timing controller, and the compensation circuit timing controller comprises: an input module, a correction module, an operation module, a dynamic compensation table and a display module;
  • the input module is configured to receive a video signal, where the video signal is converted in the input module to form an original gray scale recognized by the correction module;
  • the correction module is configured to correct the original gray scale according to the dynamic compensation table; the corrected original gray scale is transmitted to the display module and the operation module;
  • the dynamic compensation table includes a one-to-one correspondence between at least one of a pixel luminance reduction value, a grayscale current value, and a time and the compensation data.
  • an aging experiment is performed on the preselected AMOLED display panel in advance to obtain experimental data
  • the correction module corrects the original gray scale according to the brightness attenuation ratio stored in the dynamic compensation table, and transmits the corrected result to the display module; wherein the correction formula is x /(1-f) 1/ ⁇ , x is the original gray scale, and f is the luminance attenuation ratio.
  • the dynamic compensation table after receiving the brightness decay ratio of the display panel sent by the operation module, adds the received value to the original value stored in the dynamic compensation table as an update.
  • the subsequent brightness attenuation ratio is transmitted to the display module.
  • the input module is configured to receive a video signal, where the video signal is converted in the input module to form an original gray scale recognized by the correction module;
  • the attenuation rule is calculated according to the corrected original gray scale, and the dynamic compensation table is modified over time.
  • the correction module corrects the original gray scale according to the brightness attenuation ratio stored in the dynamic compensation table, and transmits the corrected result to the display module; wherein the correction formula is x /(1-f) 1/ ⁇ , x is the original gray scale, and f is the luminance attenuation ratio.
  • the dynamic compensation table after receiving the brightness decay ratio of the display panel sent by the operation module, adds the received value to the original value stored in the dynamic compensation table as an update.
  • the subsequent brightness attenuation ratio is transmitted to the display module.
  • FIG. 1 is a flow chart of a method for compensating brightness of an AMOLED display panel according to the present invention
  • FIG. 2 is a graph showing the gray scale luminance attenuation ratio of a sub-pixel displayed in a preferred embodiment of the present invention as a function of time;
  • FIG. 3 is a schematic structural diagram of an AMOLED display panel brightness compensation device according to the present invention.
  • Figure 4 is a graph showing the gray scale luminance attenuation ratio of a sub-pixel displayed in a preferred embodiment of the present invention as a function of time.
  • the present invention is directed to a conventional AMOLED display panel in which a brightness compensation device is required, and a circuit or a sensor for detecting a light-emitting state is required to be disposed in a display panel, and only an aging state of the TFT can be determined, and an aging state of the OLED light-emitting device cannot be determined. This makes the steps cumbersome and complicated in structure, and the present embodiment can improve the problem.
  • the invention provides a method for compensating brightness of an AMOLED display panel, characterized in that the method comprises the steps of:
  • Step S10 Calculate compensation data, and generate the dynamic compensation table, wherein the dynamic compensation table includes a one-to-one correspondence between at least one of a pixel brightness reduction value, a gray level current value, and a time and the compensation data.
  • an AMOLED display panel brightness compensation device performing an aging experiment on the AMOLED display panel, measuring and recording a brightness decrease value of the sub-pixels in the display panel or a change in a gray-scale current value with time; the aging experiment, That is, the brightness attenuation ratio of each of the sub-pixels caused by the projection process;
  • the compensation device includes a compensation circuit timing controller, and the compensation circuit timing controller includes: an input module, a correction module, an operation module, a dynamic compensation table, and a display module;
  • the compensation data is calculated, and the dynamic compensation table is generated; wherein the dynamic compensation table includes pixel brightness reduction a one-to-one correspondence between at least one of a value, a grayscale current value, and a time and the compensation data;
  • the data in the dynamic compensation table and the Sub-pixels form a one-to-one mapping
  • f in the formula is the brightness attenuation ratio
  • f corresponds to the compensation data
  • k is the pixel brightness reduction value per unit time and unit current
  • gray(t) is the gray level current value at time t
  • ⁇ is preselected.
  • the gamma coefficient of the AMOLED display panel, t is time.
  • Step S20 Convert the video signal received in the input module into an original gray scale recognized by the correction module.
  • Step S30 Input the original gray scale to the correction module, and the correction module corrects the original gray scale according to a dynamic compensation table.
  • the input original gray scale is corrected according to the established dynamic compensation table; wherein the correction formula is x/(1-f) 1/ ⁇ , x is the original gray scale, and f is The brightness attenuation ratio.
  • Step S40 The corrected original gray scale is transmitted to the display module and the operation module.
  • the dynamic compensation table After the dynamic compensation table receives the brightness attenuation ratio of the display panel sent by the operation module, adding the received value to the original value stored in the dynamic compensation table as the updated brightness attenuation ratio, and Transmitting the corrected result to the display module and the arithmetic module.
  • Step S50 In the operation module, calculate an attenuation rule according to the corrected original gray scale, and modify the dynamic compensation table with time.
  • an existing AMOLED display panel is selected, the display panel has a resolution of 1920*1080, and the display panel sub-pixel includes three sub-pixels of red, green, and blue, and the AMOLED display panel value is obtained by looking up the table.
  • ⁇ is 2.2.
  • an aging experiment is first performed on the preselected AMOLED display panel.
  • the display panel is measured and recorded under the conditions of pure green 64 gray scale, pure green 128 gray scale, and pure green 192 gray scale, respectively, for 200 hours, 400 hours, and 600 hours.
  • the brightness of the display panel; the experimental results are shown in Table 1, which The brightness attenuation ratio: (initial brightness - measured brightness) / initial brightness.
  • f is the brightness attenuation ratio
  • gray is the gray level
  • t is the hour number.
  • a dynamic compensation table having a size of 1920*1080*3 is established in the system, and a one-to-one mapping is formed with the sub-pixels.
  • the original gray scale is substituted into the functional formula to be corrected, the actual gray scale is obtained, and then the luminance attenuation ratio of each sub-pixel is calculated, and the dynamic compensation is filled in. table.
  • FIG. 2 shows the gray scale displayed by the sub-pixel.
  • the sub-pixels display 64 gray levels in the first 100 hours, 128 gray levels in the first 101-200 hours, 64 gray levels in the 201-300 hours, and 192 gray levels in the first 30-400 hours;
  • the brightness attenuation ratio of the sub-pixel after 400 hours can be estimated as:
  • the luminance attenuation ratio of the green sub-pixels in the 90th row and the 90th column is 16%.
  • the original gray level of the sub-pixel input into the correction module is 80 gray scale, it should be corrected to 80/(1-16%) 1/2.2 ⁇ 86 gray scale.
  • FIG. 3 is a schematic diagram of an AMOLED display panel brightness compensation device according to the present invention, wherein the brightness compensation device includes a compensation circuit timing controller, wherein the compensation circuit timing controller comprises: an input module, a correction module, and an operation. Module, dynamic compensation table and display module.
  • an aging experiment is performed on the preselected AMOLED display panel in advance, and the brightness decrease value of the sub-pixels in the display panel is measured and recorded with time and gray-scale current values; the aging experiment is caused by the screening process.
  • the brightness attenuation ratio of each of the sub-pixels is caused by the screening process.
  • the compensation data is calculated, and the dynamic compensation table is generated;
  • the dynamic compensation table includes a pixel brightness reduction value, a one-to-one correspondence between at least one of a gray scale current value and a time and the compensation data;
  • the data in the dynamic compensation table and the Sub-pixels form a one-to-one mapping
  • f is the brightness attenuation ratio
  • f corresponds to the compensation data
  • k is the pixel brightness reduction value per unit time and unit current
  • gray(t) is the gray level current value at time t
  • ⁇ is the preselected AMOLED display panel
  • the gamma coefficient, t is time.
  • the input original gray scale is corrected according to the established dynamic compensation table; wherein the correction formula is x/(1-f) 1/ ⁇ , x is the original gray scale, and f is The brightness attenuation ratio.
  • the corrected original gray scale is transmitted to the display module and the operation module; in the operation module, the attenuation law is calculated according to the corrected original gray scale, and the dynamic compensation table is updated with time;
  • the dynamic compensation table After the dynamic compensation table receives the brightness attenuation ratio of the display panel sent by the operation module, the received value is added to the original value stored in the dynamic compensation table as the updated brightness attenuation ratio. And transmitting the corrected result to the display module and the operation module.
  • an existing AMOLED display panel is selected, the display panel has a resolution of 1920*1080, and the display panel sub-pixel includes three sub-pixels of red, green, and blue, and the AMOLED display panel value is obtained by looking up the table.
  • ⁇ is 2.2.
  • the aging experiment of the preselected AMOLED display panel is first performed by the brightness compensation device.
  • the display panel is measured and recorded under the conditions of pure green 64 gray scale, pure green 128 gray scale, and pure green 192 gray scale, respectively, for 200 hours, 400 hours, and 600 hours.
  • the brightness of the display panel; the experimental results are shown in Table 2, wherein the brightness attenuation ratio: (initial brightness - measured brightness) / initial brightness.
  • f is the brightness attenuation ratio
  • gray is the gray level
  • t is the hour number.
  • a dynamic compensation table having a size of 1920*1080*3 is established in the system, and a one-to-one mapping is formed with the sub-pixels.
  • the original gray scale is substituted into the functional formula to be corrected, and the actual gray scale is obtained, and then the luminance attenuation ratio of each sub-pixel is calculated, and the dynamic compensation is filled in. table.
  • FIG. 4 shows the gray scale displayed by the sub-pixel.
  • the sub-pixels display 64 gray levels in the first 100 hours, 128 gray levels in the first 101-200 hours, 64 gray levels in the 201-300 hours, and 192 gray levels in the first 30-400 hours;
  • the brightness attenuation ratio of the sub-pixel after 400 hours can be estimated as:
  • the luminance attenuation ratio of the green sub-pixels in the 90th row and the 90th column is 16%.
  • the original gray level of the sub-pixel input into the correction module is 80 gray scale, it should be corrected to 80/(1-16%) 1/2.2 ⁇ 86 gray scale.
  • the invention provides a method and a device for compensating the brightness of an AMOLED display panel.
  • the method has the advantages of simple structure and simple operation.
  • the aging experiment of the display panel is performed in advance to obtain the brightness of the sub-pixel with gray scale and time. Decline Decrement the law, then calculate the attenuation ratio according to the gray scale of the projection, correct the original gray scale of the input, and compensate the brightness of the sub-pixel to make the display panel display normal; the invention can not set the circuit for detecting the illumination state in the display panel or In the case of a sensor, the aging of the TFT in the display and the attenuation of the OLED luminous efficiency can be compensated at the same time.

Abstract

一种AMOLED显示面板亮度补偿方法及装置，方法步骤简洁，装置结构简单、易于操作，通过预先对显示面板进行老化实验，得到子像素亮度随灰阶、时间的衰减规律，计算补偿数据，并生成动态补偿表；在校正模块中，根据动态补偿表对输入的原始灰阶进行修正，子像素的亮度得到补偿，使得显示面板显示正常。

Description

一种AMOLED显示面板亮度补偿方法及装置 技术领域
本发明涉及面板显示技术，特别涉及一种AMOLED显示面板亮度补偿方法及装置。
背景技术
目前，有机发光二极管(Organic Light-Emitting Diode，OLED)作为平面显示器新兴应用技术，由于具有自发光特性，不需背光源，能够节省电能，可视角度大等优势，已在手机、数码摄像机、平板电脑及电视机等终端中得到广泛应用。
OLED显示装置按照驱动方式可以分为无源矩阵型(Passive Matrix OLED，PMOLED)和有源矩阵型(Active Matrix OLED，AMOLED)两大类，即直接寻址和薄膜晶体管(Thin Film Transistor，TFT)矩阵寻址两类。其中，AMOLED具有呈阵列式排布的像素，属于主动显示类型，发光效能高，通常用作高清晰度的大尺寸显示装置。
在目前制作工艺条件下，有机电致发光二极管显示器件存在空间上和时间上的不均匀性问题，并且随着显示器件尺寸的变大，此类问题暴露的愈发明显，因此解决大尺寸OLED显示器件的显示不均匀性成为量产中不可缺少的关键技术之一。OLED显示器件的显示不均匀性与制作工艺紧密相关，当整个面板上的阈值电压的值有较大的差异时，显示器件整体的亮度均匀性变差。
随着LED显示器生产和封装技术工艺的不断改善和完善，从工艺上改善OLED显示器的寿命已经越来越难以突破了。内部电路补偿由于要增加TFT和电容数量，会导致开口率下降，因此改善OLED显示器寿命效能有限。因此，外部电路补偿和图像处理方法改善OLED显示器寿命是业界的研究方向。
对于外部电路和图像处理方法进行OLED显示器的寿命改善，首先要确定OLED显示器的亮度衰减程度。目前主要是通过外部检测电路实时检测OLED显示器阳极电压确定其衰减程度，无法直接根据OLED显示器显示图像的灰度值及显示时间确定OLED显示器的亮度衰减程度。另外，这种方式可以确定TFT的老化状态，但不能确定OLED发光器件的老化状态；并且，这种方式需要在面板中加入测量电路。
发明内容
本发明提供了一种AMOLED显示面板亮度补偿装置，以解决AMOLED显示面板亮度衰减的问题。
为解决上述问题，本发明提供的技术方案如下：
本发明提供一种AMOLED显示面板亮度补偿方法，其特征在于，所述方法包括步骤：
步骤S20、将输入模块中接收到的视频信号，转换成校正模块识别的原始灰阶；
步骤S30、将所述原始灰阶输入至所述校正模块，所述校正模块根据动态补偿表对所述原始灰阶进行修正；
步骤S40、将修正后的所述原始灰阶传输至显示模块及运算模块；
步骤S50、在所述运算模块中，根据修正后的所述原始灰阶，计算衰减规律，并随时间修改所述动态补偿表。
根据本发明一优选实施例，在所述步骤S20之前，所述方法还包括：
步骤S10、计算补偿数据，并生成所述动态补偿表，其中，所述动态补偿表包括像素亮度降幅值、灰阶电流值、时间中的至少一者与所述补偿数据的一一对应关系。
根据本发明一优选实施例，所述步骤S10包括：
步骤S101、对预选的AMOLED显示面板进行老化实验，以得到实验数据；
步骤S102、根据所述实验数据，结合公式f＝k·∫(gray(t)^γ)dt，计算得出补偿数据，并生成所述动态补偿表；
其中，f为亮度衰减比例，f与所述补偿数据对应，k为单位时间、单位电流下的像素亮度降幅值，gray(t)为t时刻的灰阶电流值，γ为预选的AMOLED显示面板的gamma系数，t为时间。
根据本发明一优选实施例，所述步骤S30包括：
S301、将所述原始灰阶输入至校正模块；
S302、所述校正模块根据所述补偿数据、修正公式x/(1-f)1/γ对所述原始灰阶x进行修正；
其中，x为原始灰阶，f为亮度衰减比例。
根据本发明一优选实施例，所述步骤S30包括：
当所述动态补偿表接收到所述运算模块发送的所述显示面板亮度衰减比例后，将接收的数值与所述动态补偿表内存储的原数值相加，作为更新后的亮度衰减比例，并将修正后的结果传输至所述显示模块。
本发明提供了一种AMOLED显示面板亮度补偿装置，所述补偿装置包括补偿电路时序控制器，所述补偿电路时序控制器包括：输入模块，校正模块，运算模块，动态补偿表和显示模块；
所述输入模块用于接收视频信号，所述视频信号在所述输入模块中转换形成被所述校正模块识别的原始灰阶；
所述校正模块用于根据所述动态补偿表中对所述原始灰阶进行修正；修正后的所述原始灰阶被传输至所述显示模块及所述运算模块；
其中，在所述运算模块中，根据修正后的所述原始灰阶，计算衰减规律，并随时间修改所述动态补偿表；
所述动态补偿表包括像素亮度降幅值、灰阶电流值、时间中的至少一者与所述补偿数据的一一对应关系。
根据本发明一优选实施例，预先对预选的所述AMOLED显示面板进行老化实验，得到实验数据；
根据所述实验数据，结合公式f＝k·∫(gray(t)^γ)dt，计算得出补偿数据，并生成所述动态补偿表；
其中，f为亮度衰减比例，f与所述补偿数据对应，k为单位时间、单位电流下的像素亮度降幅值，gray(t)为t时刻的灰阶电 流值，γ为预选的AMOLED显示面板的gamma系数，t为时间。
根据本发明一优选实施例，所述校正模块根据所述动态补偿表存储的亮度衰减比例，对所述原始灰阶进行修正，并将修正后的结果传输至显示模块；其中，修正公式为x/(1-f)1/γ，x为原始灰阶，f为亮度衰减比例。
根据本发明一优选实施例，所述动态补偿表接收到所述运算模块发送的所述显示面板亮度衰减比例后，将接收的数值与所述动态补偿表内存储的原数值相加，作为更新后的亮度衰减比例，并将修正后的结果传输至所述显示模块。
本发明还提供了一种AMOLED显示面板亮度补偿装置，所述补偿装置包括补偿电路时序控制器，所述补偿电路时序控制器包括：输入模块，校正模块，运算模块，动态补偿表和显示模块；
所述输入模块用于接收视频信号，所述视频信号在所述输入模块中转换形成被所述校正模块识别的原始灰阶；
所述校正模块用于根据所述动态补偿表中对所述原始灰阶进行修正；修正后的所述原始灰阶被传输至所述显示模块及所述运算模块；
其中，在所述运算模块中，根据修正后的所述原始灰阶，计算衰减规律，并随时间修改所述动态补偿表。
根据本发明一优选实施例，预先对预选的所述AMOLED显示面板进行老化实验，得到实验数据；
根据所述实验数据，结合公式f＝k·∫(gray(t)^γ)dt，计算得出补 偿数据，并生成所述动态补偿表；
其中，f为亮度衰减比例，f与所述补偿数据对应，k为单位时间、单位电流下的像素亮度降幅值，gray(t)为t时刻的灰阶电流值，γ为预选的AMOLED显示面板的gamma系数，t为时间。
根据本发明一优选实施例，所述校正模块根据所述动态补偿表存储的亮度衰减比例，对所述原始灰阶进行修正，并将修正后的结果传输至显示模块；其中，修正公式为x/(1-f)1/γ，x为原始灰阶，f为亮度衰减比例。
根据本发明一优选实施例，所述动态补偿表接收到所述运算模块发送的所述显示面板亮度衰减比例后，将接收的数值与所述动态补偿表内存储的原数值相加，作为更新后的亮度衰减比例，并将修正后的结果传输至所述显示模块。
本发明的有益效果为：相比现有技术，本发明的显示面板亮度补偿装置结构简单、易于操作，所述方法步骤简洁，通过预先对所述显示面板进行老化实验，得到子像素亮度随灰阶、时间的衰减规律，计算补偿数据，并生成动态补偿表，在校正模块中，根据所述动态补偿表对输入的原始灰阶进行修正，子像素的亮度得到补偿，使得显示面板在不设置检测发光状态的电路或传感器的情况下，能对显示器中TFT的老化及OLED发光效率的衰减进行补偿，使显示面板显示正常。
附图说明
为了更清楚地说明实施例或现有技术中的技术方案，下面将 对实施例或现有技术描述中所需要使用的附图作简单介绍，显而易见地，下面描述中的附图仅仅是发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为本发明一种AMOLED显示面板亮度补偿方法的流程图；
图2位本发明一优选实施例中某一子像素显示的灰阶亮度衰减比例随时间变化的曲线图；
图3为本发明一种AMOLED显示面板亮度补偿装置的结构示意图；
图4位本发明一优选实施例中某一子像素显示的灰阶亮度衰减比例随时间变化的曲线图。
具体实施方式
以下各实施例的说明是参考附加的图示，用以例示本发明可用以实施的特定实施例。本发明所提到的方向用语，例如[上]、[下]、[前]、[后]、[左]、[右]、[内]、[外]、[侧面]等，仅是参考附加图式的方向。因此，使用的方向用语是用以说明及理解本发明，而非用以限制本发明。在图中，结构相似的单元是用以相同标号表示。
本发明针对现有的AMOLED显示面板因亮度补偿装置，因需要在显示面板中设置检测发光状态的电路或传感器，且只能确定TFT的老化状态，不能确定OLED发光器件的老化状态等问题， 使得步骤繁琐，结构复杂，本实施例能改善所述问题。
本发明提供一种AMOLED显示面板亮度补偿方法，其特征在于，所述方法包括步骤：
步骤S10、计算补偿数据，并生成所述动态补偿表，其中，所述动态补偿表包括像素亮度降幅值、灰阶电流值、时间中的至少一者与所述补偿数据的一一对应关系。
提供一AMOLED显示面板亮度补偿装置，对所述AMOLED显示面板进行老化实验，测量并记录所述显示面板中子像素的亮度降幅值或者随着时间、灰阶电流值的变化；所述老化实验，即根据放映过程造成的各所述子像素的亮度衰减比例；
其中，所述补偿装置包括补偿电路时序控制器，所述补偿电路时序控制器包括：输入模块、校正模块、运算模块、动态补偿表和显示模块；
然后，根据所述实验数据，结合公式f＝k·∫(gray(t)^γ)dt，计算得出补偿数据，并生成所述动态补偿表；其中，所述动态补偿表包括像素亮度降幅值、灰阶电流值、时间中的至少一者与所述补偿数据的一一对应关系；
例如，所述显示面板的的分辨率为1920*1080，则所述显示面板中的子像素为1920*1080*3个，根据所述函数关系式，所述动态补偿表中的数据与所述子像素形成一一映射；
另外，公式中的f为亮度衰减比例，f与所述补偿数据对应，k为单位时间、单位电流下的像素亮度降幅值，gray(t)为t时刻的灰阶电流值，γ为预选的AMOLED显示面板的gamma系数，t为时间。
步骤S20、将输入模块中接收到的视频信号，转换成校正模块识别的原始灰阶。
步骤S30、将所述原始灰阶输入至所述校正模块，所述校正模块根据动态补偿表对所述原始灰阶进行修正。
在所述校正模块中，根据所建立的动态补偿表，对输入的所述原始灰阶进行校正；其中，修正公式为x/(1-f)1/γ，x为原始灰阶，f为亮度衰减比例。
步骤S40、将修正后的所述原始灰阶传输至显示模块及运算模块。
当所述动态补偿表收到所述运算模块发送的所述显示面板亮度衰减比例后，将接收的数值与所述动态补偿表内存储的原数值相加，作为更新后的亮度衰减比例，并将修正后的结果传输至所述显示模块及所述运算模块。
步骤S50、在所述运算模块中，根据修正后的所述原始灰阶，计算衰减规律，并随时间修改所述动态补偿表。
例如，选定一块现有的AMOLED显示面板，所述显示面板分辨率为1920*1080，所述显示面板子像素包括红、绿、蓝三种子像素，经查表得到所述AMOLED显示面板值的γ为2.2。
根据本发明所提供的亮度补偿方法，首先对预选的所述AMOLED显示面板进行老化实验。
以绿色子像素为例，使显示面板分别在纯绿64灰阶、纯绿128灰阶、纯绿192灰阶下，分别工作200小时、400小时、600小时的情下，测量并记录所述显示面板的亮度；实验结果如表1所示，其 中，所述亮度衰减比例：(初始亮度-测量亮度)/初始亮度。
表1亮度衰减比例与时间、灰阶的关系
Figure PCTCN2017115594-appb-000001
根据表1中的数据，并结合公式f＝k·∫(gray(t)^γ)dt，得出
f＝10-2·∫(gray(255)^2.2)dt              (1-1)
其中，f为亮度衰减比例，gray为灰阶，t为小时数。
根据式(1-1)，在系统中建立尺寸为1920*1080*3的动态补偿表，与子像素形成一一映射。
在使用过程中，根据式(1-1)，将所述原始灰阶代入所述函数式进行修正，得到实际的灰阶，然后计算各子像素的亮度衰减比例，并填入所述动态补偿表。
以第90行第90列的绿色子像素为例，其中，图2所示为所述子像素显示的灰阶。
从图中可以看出，所述子像素在前100小时显示64灰阶，第101-200小时显示128灰阶，第201-300小时显示64灰阶，第301-400小时显示192灰阶；
则根据函数式(1-1)可估算所述子像素400小时后的亮度衰减比例为：
f＝10-2·∫(gray(255)^2.2)dt＝16％
则所述动态补偿表中，所述第90行第90列的绿色子像素的亮度衰减比例为16％。
而在正常使用时，如果输入所述校正模块中该子像素的原始 灰阶为80灰阶时，则应修正为80/(1-16％)1/2.2≈86灰阶。
图3所示为本发明提供的一种AMOLED显示面板亮度补偿装置，所述亮度补偿装置包括补偿电路时序控制器，其特征在于，所述补偿电路时序控制器包括：输入模块，校正模块，运算模块，动态补偿表和显示模块。
首先，预先对预选的所述AMOLED显示面板进行老化实验，测量并记录所述显示面板中子像素的亮度降幅值随着时间、灰阶电流值的变化；所述老化实验，即根据放映过程造成的各所述子像素的亮度衰减比例。
其次，根据所述实验数据，结合公式f＝k·∫(gray(t)^γ)dt，计算得出补偿数据，并生成所述动态补偿表；所述动态补偿表包括像素亮度降幅值、灰阶电流值、时间中的至少一者与所述补偿数据的一一对应关系；
例如，所述显示面板的的分辨率为1920*1080，则所述显示面板中的子像素为1920*1080*3个，根据所述函数关系式，所述动态补偿表中的数据与所述子像素形成一一映射；
其中，f为亮度衰减比例，f与所述补偿数据对应，k为单位时间、单位电流下的像素亮度降幅值，gray(t)为t时刻的灰阶电流值，γ为预选的AMOLED显示面板的gamma系数，t为时间。
然后，将所述输入模块接收的视频信号转换成能被所述校正模块识别的原始灰阶，而所述校正模块根据动态补偿表对所述原始灰阶进行修正；
在所述校正模块中，根据所建立的动态补偿表，对输入的所述原始灰阶进行校正；其中，修正公式为x/(1-f)1/γ，x为原始灰阶，f为亮度衰减比例。
最后，将修正后的所述原始灰阶传输至显示模块及运算模块；在所述运算模块中，根据修正后的所述原始灰阶，计算衰减规律，并随时间更新所述动态补偿表；
其中，当所述动态补偿表收到所述运算模块发送的所述显示面板亮度衰减比例后，将接收的数值与所述动态补偿表内存储的原数值相加，作为更新后的亮度衰减比例，并将修正后的结果传输至所述显示模块及运算模块。
例如，选定一块现有的AMOLED显示面板，所述显示面板分辨率为1920*1080，所述显示面板子像素包括红、绿、蓝三种子像素，经查表得到所述AMOLED显示面板值的γ为2.2。
根据本发明所提供的亮度补偿装置，首先利用所述亮度补偿装置对预选的所述AMOLED显示面板进行老化实验。
以绿色子像素为例，使显示面板分别在纯绿64灰阶、纯绿128灰阶、纯绿192灰阶下，分别工作200小时、400小时、600小时的情下，测量并记录所述显示面板的亮度；实验结果如表2所示，其中，所述亮度衰减比例：(初始亮度-测量亮度)/初始亮度。
表2亮度衰减比例与时间、灰阶的关系
Figure PCTCN2017115594-appb-000002
根据表2中的数据，并结合公式f＝k·∫(gray(t)^γ)dt，得出
f＝10-2·∫(gray(255)^2.2)dt               (2-1)
其中，f为亮度衰减比例，gray为灰阶，t为小时数。
根据式(2-1)，在系统中建立尺寸为1920*1080*3的动态补偿表，与子像素形成一一映射。
在使用过程中，根据式(2-1)，将所述原始灰阶代入所述函数式进行修正，得到实际的灰阶，然后计算各子像素的亮度衰减比例，并填入所述动态补偿表。
以第90行第90列的绿色子像素为例，其中，图4所示为所述子像素显示的灰阶。
从图中可以看出，所述子像素在前100小时显示64灰阶，第101-200小时显示128灰阶，第201-300小时显示64灰阶，第301-400小时显示192灰阶；
则根据函数式(2-1)可估算所述子像素400小时后的亮度衰减比例为：
f＝10-2·∫(gray(255)^2.2)dt＝16％
则所述动态补偿表中，所述第90行第90列的绿色子像素的亮度衰减比例为16％。
而在正常使用时，如果输入所述校正模块中该子像素的原始灰阶为80灰阶时，则应修正为80/(1-16％)1/2.2≈86灰阶。
本发明提供了一种AMOLED显示面板亮度补偿方法及装置，所述方法步骤简洁，所述装置结构简单、易于操作，通过预先对所述显示面板进行老化实验，得到子像素亮度随灰阶、时间的衰 减规律，然后根据放映的灰阶推算衰减比例，对输入的原始灰阶进行修正，子像素的亮度得到补偿，使得显示面板显示正常；本发明能在显示面板中不设置检测发光状态的电路或传感器的情况下，能同时对所述显示器中TFT的老化及OLED发光效率的衰减进行补偿。
综上所述，虽然本发明已以优选实施例揭露如上，但上述优选实施例并非用以限制本发明，本领域的普通技术人员，在不脱离本发明的精神和范围内，均可作各种更动与润饰，因此本发明的保护范围以权利要求界定的范围为准。

Claims (13)

  1. 一种AMOLED显示面板亮度补偿方法，其中，所述方法包括步骤：
    步骤S20、将输入模块中接收到的视频信号，转换成校正模块识别的原始灰阶；
    步骤S30、将所述原始灰阶输入至所述校正模块，所述校正模块根据动态补偿表对所述原始灰阶进行修正；
    步骤S40、将修正后的所述原始灰阶传输至显示模块及运算模块；
    步骤S50、在所述运算模块中，根据修正后的所述原始灰阶，计算衰减规律，并随时间修改所述动态补偿表。
  2. 根据权利要求1所述的方法，其中，在所述步骤S20之前，所述方法还包括：
    步骤S10、计算补偿数据，并生成所述动态补偿表，其中，所述动态补偿表包括像素亮度降幅值、灰阶电流值、时间中的至少一者与所述补偿数据的一一对应关系。
  3. 根据权利要求2所述的方法，其中，所述步骤S10包括：
    步骤S101、对预选的AMOLED显示面板进行老化实验，以得到实验数据；
    步骤S102、根据所述实验数据，结合公式f＝k·∫(gray(t)^γ)dt，计算得出补偿数据，并生成所述动态补偿表；
    其中，f为亮度衰减比例，f与所述补偿数据对应，k为单位 时间、单位电流下的像素亮度降幅值，gray(t)为t时刻的灰阶电流值，γ为预选的AMOLED显示面板的gamma系数，t为时间。
  4. 根据权利要求3所述的方法，其中，所述步骤S30包括：
    S301、将所述原始灰阶输入至校正模块；
    S302、所述校正模块根据所述补偿数据、修正公式x/(1-f)1/γ对所述原始灰阶x进行修正；
    其中，x为原始灰阶，f为亮度衰减比例。
  5. 根据权利要求1所述的方法，其中，所述步骤S30包括：
    当所述动态补偿表接收到所述运算模块发送的所述显示面板亮度衰减比例后，将接收的数值与所述动态补偿表内存储的原数值相加，作为更新后的亮度衰减比例，并将修正后的结果传输至所述显示模块。
  6. 一种AMOLED显示面板亮度补偿装置，所述补偿装置包括补偿电路时序控制器，其中，所述补偿电路时序控制器包括：输入模块，校正模块，运算模块，动态补偿表和显示模块；
    所述输入模块用于接收视频信号，所述视频信号在所述输入模块中转换形成被所述校正模块识别的原始灰阶；
    所述校正模块用于根据所述动态补偿表中对所述原始灰阶进行修正；修正后的所述原始灰阶被传输至所述显示模块及所述运算模块；
    其中，在所述运算模块中，根据修正后的所述原始灰阶，计算衰减规律，并随时间修改所述动态补偿表；
    所述动态补偿表包括像素亮度降幅值、灰阶电流值、时间中 的至少一者与所述补偿数据的一一对应关系。
  7. 根据权利要求6所述的补偿装置，其中，预先对预选的所述AMOLED显示面板进行老化实验，得到实验数据；
    根据所述实验数据，结合公式f＝k·∫(gray(t)^γ)dt，计算得出补偿数据，并生成所述动态补偿表；
    其中，f为亮度衰减比例，f与所述补偿数据对应，k为单位时间、单位电流下的像素亮度降幅值，gray(t)为t时刻的灰阶电流值，γ为预选的AMOLED显示面板的gamma系数，t为时间。
  8. 根据权利要求6所述的补偿装置，其中，所述校正模块根据所述动态补偿表存储的亮度衰减比例，对所述原始灰阶进行修正，并将修正后的结果传输至显示模块；其中，修正公式为x/(1-f)1/γ，x为原始灰阶，f为亮度衰减比例。
  9. 根据权利要求6所述的补偿装置，其中，所述动态补偿表接收到所述运算模块发送的所述显示面板亮度衰减比例后，将接收的数值与所述动态补偿表内存储的原数值相加，作为更新后的亮度衰减比例，并将修正后的结果传输至所述显示模块。
  10. 一种AMOLED显示面板亮度补偿装置，所述补偿装置包括补偿电路时序控制器，其中，所述补偿电路时序控制器包括：输入模块，校正模块，运算模块，动态补偿表和显示模块；
    所述输入模块用于接收视频信号，所述视频信号在所述输入模块中转换形成被所述校正模块识别的原始灰阶；
    所述校正模块用于根据所述动态补偿表中对所述原始灰阶进行修正；修正后的所述原始灰阶被传输至所述显示模块及所述运 算模块；
    其中，在所述运算模块中，根据修正后的所述原始灰阶，计算衰减规律，并随时间修改所述动态补偿表。
  11. 根据权利要求10所述的补偿装置，其中，预先对预选的所述AMOLED显示面板进行老化实验，得到实验数据；
    根据所述实验数据，结合公式f＝k·∫(gray(t)^γ)dt，计算得出补偿数据，并生成所述动态补偿表；
    其中，f为亮度衰减比例，f与所述补偿数据对应，k为单位时间、单位电流下的像素亮度降幅值，gray(t)为t时刻的灰阶电流值，γ为预选的AMOLED显示面板的gamma系数，t为时间。
  12. 根据权利要求10所述的补偿装置，其中，所述校正模块根据所述动态补偿表存储的亮度衰减比例，对所述原始灰阶进行修正，并将修正后的结果传输至显示模块；其中，修正公式为x/(1-f)1/γ，x为原始灰阶，f为亮度衰减比例。
  13. 根据权利要求10所述的补偿装置，其中，所述动态补偿表接收到所述运算模块发送的所述显示面板亮度衰减比例后，将接收的数值与所述动态补偿表内存储的原数值相加，作为更新后的亮度衰减比例，并将修正后的结果传输至所述显示模块。
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