WO2022088954A1 - 用于显示装置的亮度补偿方法、驱动方法及装置 - Google Patents

用于显示装置的亮度补偿方法、驱动方法及装置 Download PDF

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Publication number
WO2022088954A1
WO2022088954A1 PCT/CN2021/115960 CN2021115960W WO2022088954A1 WO 2022088954 A1 WO2022088954 A1 WO 2022088954A1 CN 2021115960 W CN2021115960 W CN 2021115960W WO 2022088954 A1 WO2022088954 A1 WO 2022088954A1
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Prior art keywords
picture
frame
value
grayscale
compensation
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PCT/CN2021/115960
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English (en)
French (fr)
Inventor
陈文斌
晏荣建
宋广军
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京东方科技集团股份有限公司
成都京东方光电科技有限公司
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Priority to US17/788,360 priority Critical patent/US11721304B2/en
Publication of WO2022088954A1 publication Critical patent/WO2022088954A1/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
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/10—Intensity circuits
    • 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
    • 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
    • G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/2007—Display of intermediate tones
    • G09G3/2018—Display of intermediate tones by time modulation using two or more time intervals
    • G09G3/2022—Display of intermediate tones by time modulation using two or more time intervals using sub-frames
    • 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
    • G09G2320/0252—Improving the response speed
    • 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
    • G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
    • 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
    • G09G2320/06—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
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0673—Adjustment of display parameters for control of gamma adjustment, e.g. selecting another gamma curve
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2340/00—Aspects of display data processing
    • G09G2340/16—Determination of a pixel data signal depending on the signal applied in the previous frame
    • 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 disclosure relates to the field of display technology, and more particularly, to a brightness compensation method for a display device, a driving method of the display device, and a device thereof.
  • the present disclosure provides a brightness compensation method for a display device, a driving method of the display device, and a device thereof to at least partially solve the above problems.
  • a brightness compensation method for a display device comprising:
  • acquiring display brightness data of multiple frames of pictures displayed after the display picture of the display device is switched from the first grayscale value to the second grayscale value includes:
  • the display device After the display device displays the first picture with the first grayscale value, sequentially displaying multiple frames of second pictures with the second grayscale value;
  • the luminance coefficient of each frame of pictures in the multi-frame pictures is determined according to the following expression:
  • M(i) represents the luminance coefficient of the i-th frame of the multi-frame images
  • L i represents the luminance of the i-th frame
  • N is the multi-frame image The number of frames.
  • determining a reference picture and at least one frame of pictures to be compensated in the multi-frame pictures according to the luminance coefficient includes:
  • the next frame is It is determined as the reference picture, and each frame of pictures before the next frame of picture is determined as the at least one frame to be compensated.
  • the grayscale compensation value of the at least one frame of the picture to be compensated is determined, so that the display brightness of each frame of the picture to be compensated in the at least one frame of the picture to be compensated displayed by the display device is the same as the displayed brightness of each frame of the picture to be compensated.
  • the ratio of the display brightness of the reference picture greater than or equal to the preset first brightness threshold includes:
  • the selected grayscale adjustment step is used as the grayscale compensation value of the at least one frame to be compensated.
  • acquiring the display brightness data of at least one frame of the picture to be compensated and the reference picture displayed after the display picture of the display device is switched from the first grayscale value to the determined grayscale value after adjustment includes:
  • the display device uses the determined adjusted grayscale value as the grayscale value of the at least one frame to be compensated and the reference picture, after the display device displays the first picture with the first grayscale value, sequentially displaying the at least one frame of the picture to be compensated and the reference picture;
  • the display brightness of the at least one frame to be compensated and the reference picture is collected.
  • the display device includes a gamma unit
  • the gray scale adjustment step size is selected according to an integer multiple of the gray scale represented by the minimum resolution of the binding point voltage of the Gamma unit.
  • the display picture is a red picture, a green picture or a blue picture, and the first grayscale value is smaller than the second grayscale value.
  • a method for driving a display device comprising:
  • the grayscale compensation value in the luminance compensation lookup table is determined based on the method provided by the first aspect of the present disclosure.
  • querying the luminance compensation lookup table to obtain the grayscale compensation value includes:
  • the grayscale value m of the picture currently being displayed determine the first lower limit grayscale value a and the first upper limit grayscale value a' in the luminance compensation lookup table, such that a ⁇ m ⁇ a';
  • the second lower limit grayscale value b and the second upper limit grayscale value b' are determined in the luminance compensation lookup table, such that b ⁇ n ⁇ b'; as well as
  • the luminance compensation look-up table is consulted to obtain the gray-scale compensation value G off (a, b) that switches from the first lower-limit gray-scale value a to the second lower-limit gray-scale value b, from
  • the first upper limit grayscale value a' is switched to the grayscale compensation value G off (a', b) of the second lower limit grayscale value b, and the first lower limit grayscale value a is switched to the second upper limit grayscale value b'.
  • the compensated grayscale value m' of the next frame to be displayed is calculated according to the following expression:
  • the luminance compensation lookup table includes a red compensation lookup table, a green compensation lookup table, and a blue compensation lookup table
  • the querying the brightness compensation lookup table to obtain the grayscale compensation value includes:
  • the red compensation lookup table, the green compensation lookup table, and the blue compensation lookup table are respectively queried to obtain the red grayscale compensation value, the green grayscale compensation value, and the blue grayscale compensation value, respectively.
  • a luminance compensation device comprising:
  • a memory configured to store program instructions
  • a processor configured to execute the program instructions to perform the method provided by the first aspect of the present disclosure.
  • a display driver comprising:
  • a data processor including a compensation register, in which a luminance compensation look-up table is stored, and the grayscale compensation value in the luminance compensation look-up table is determined based on the method provided in the first aspect of the present disclosure
  • the data processor is configured to:
  • a display device is driven using the compensated grayscale values.
  • a display device comprising:
  • a display driver as provided in a fourth aspect of the present disclosure is a display driver as provided in a fourth aspect of the present disclosure.
  • the trailing phenomenon caused by insufficient display brightness of several initial frame images is improved.
  • the color of the smear can be adjusted while improving the smearing phenomenon, which further improves the user's visual experience.
  • FIG. 1 schematically shows a flowchart of a brightness compensation method for a display device according to an embodiment of the present disclosure
  • Fig. 2 schematically shows a block diagram of a test device for collecting the display brightness of a display screen
  • FIG. 3 schematically shows the change of the display brightness of the multi-frame display pictures after picture switching
  • FIG. 4 schematically shows a process of determining compensation parameters according to an embodiment of the present disclosure
  • FIG. 5 schematically shows a process of performing picture switching between a plurality of display pictures with different grayscale values
  • FIG. 6 schematically shows an example of a luminance compensation look-up table
  • FIG. 7 schematically shows a flowchart of a method for driving a display device according to another embodiment of the present disclosure
  • FIG. 8 schematically shows a block diagram of a DDIC that performs the driving method of the display device shown in FIG. 7;
  • FIG. 9 schematically shows a block diagram of a luminance compensation apparatus according to another embodiment of the present disclosure.
  • FIG. 10 schematically shows a block diagram of a display device according to another embodiment of the present disclosure.
  • connection to may mean that two components are directly connected, or may mean that two components are connected via one or more other components.
  • the two components may be connected or coupled by wired or wireless means.
  • FIG. 1 schematically shows a flowchart of a brightness compensation method 100 for a display device according to an embodiment of the present disclosure. As shown in FIG. 1 , the brightness compensation method 100 according to an embodiment of the present disclosure may include the following steps.
  • step S110 the display luminance data of the multi-frame picture displayed after the display picture of the display device is switched from the first grayscale value to the second grayscale value is acquired.
  • step S120 the brightness coefficient of each frame of the multi-frame picture is determined according to the display brightness data of the multi-frame picture.
  • step S130 a reference picture and at least one to-be-compensated picture in the multi-frame pictures are determined according to the luminance coefficient.
  • step S140 the grayscale compensation value of the at least one frame of the picture to be compensated is determined, so that the ratio of the display brightness of each frame of the to-be-compensated picture to the displayed reference picture in the at least one frame of the to-be-compensated picture displayed by the display device is greater than or equal to the preset first brightness threshold.
  • test device as shown in FIG. 2 can be used to simulate a scene in which the display device performs screen switching and measure the display brightness of the display screen.
  • FIG. 2 schematically shows a block diagram of a test apparatus for collecting display brightness of a display screen according to an embodiment of the present disclosure.
  • the test device includes a controller 201 , a picture generator 202 , an optical test probe 203 and a test stage 204 on which a display device 205 to be tested is placed.
  • the controller 201 may be a processor or a personal computer for controlling the operation of the picture generator 202 and the optical test probe 203 .
  • the screen generator 202 is connected to the controller 201, it receives instructions from the controller 201, generates a screen to be displayed on the display device 205 according to the received instructions, and sends the generated screen to the display device 205 in a specific order for processing. show.
  • the optical test probe 203 is used to detect the display brightness of the display image during the process of displaying the image on the display device 205 .
  • the test stage 204 is used to support and fix the display device 205 during testing.
  • the display device 205 or a display module (eg, a display screen) separated from the display device 205 is fixed on the test stage 204 , and the display device 205 is connected with the patch cable of the picture generator 202 at the same time.
  • the red picture is sent to the display device 205 for display.
  • the picture generator 202 can be controlled to generate only one frame of a red picture with the first grayscale value, and then only one frame of the red picture with the first grayscale value is displayed by the display device 205 before the picture switching. It is also possible to control the picture generator 202 to generate multiple frames of red pictures with the first grayscale value, and then display multiple frames of red pictures with the first grayscale value through the display device 205 before the picture switching. Do limit.
  • the controller 201 continues to use the controller 201 to control the picture generator 202 to generate a multi-frame red picture (the second picture) with the second grayscale value, and control the picture generator 202 to generate the red picture with the second grayscale value.
  • the multiple frames of red pictures are sequentially sent to the display device 205 for display.
  • the optical test probe 203 is used to synchronously collect the display brightness data of multiple frames of the red pictures with the second grayscale value, and the collected display brightness data is fed back
  • the controller 201 is stored.
  • FIG. 3 schematically shows the change of the display brightness of the multi-frame display images after the image switching.
  • the area between the vertical line L1 and the vertical line L2 represents the displayed 4 frames of the first picture with the first grayscale value
  • the area between the vertical line L2 and the vertical line L3 represents the display
  • the 4 frames have the second picture of the second grayscale value.
  • the switching of the first picture with the first grayscale value to the second picture with the second grayscale value occurs at the vertical line L2, and the first frame and the second grayscale value after the picture switching occurs
  • the display brightness of the second frame is significantly lower than the display brightness of the subsequent third and fourth frames. This is due to the insufficient charging and discharging speed of the storage capacitor in the pixel driving circuit of the display device 205 .
  • the charge stored in the storage capacitor cannot be adjusted to the required value in time, so that the current flowing through the light-emitting unit is lower than the expected current, which in turn causes the display brightness of the display screen to be low.
  • the low display brightness of the screen will lead to smearing phenomenon.
  • the smearing phenomenon is improved by performing brightness compensation on the above-mentioned several initial frames.
  • the controller 201 can control the picture generator 202 to generate solid color pictures of the red picture, green picture and blue picture respectively, and respectively collect the pictures of the display device 205 when the solid color pictures of different colors are switched. Brightness changes.
  • the number of second pictures with the second grayscale value generated by the picture generator 202 may be determined according to the display performance of the display device 205 . For example, if it is determined through testing that the display brightness of the display device 205 after 3 frames of the second picture is stable, it is considered that starting from the 4th frame of the second picture, the display brightness of the subsequent second pictures can be considered as expected.
  • the desired brightness is the brightness of the screen when the display device 205 stably displays the second grayscale value.
  • the picture generator 202 can be controlled to generate a second picture with 4 frames or more than 4 frames, for example, a 5-frame second picture, a 10-frame second picture, and the like.
  • the number of the second screens displayed in the test can be selected according to the test time and the performance of the product. According to the performance of the product, the time to reach the desired screen brightness after the screen switching is determined, thereby determining the number of screens to be displayed to achieve the desired screen brightness. Select the number of second frames.
  • the number of pictures to be subjected to brightness compensation is determined.
  • a luminance coefficient of each frame of the second picture in the multi-frame second pictures is calculated, and at least one picture to be compensated in the multi-frame pictures is determined according to the luminance coefficient of each frame of the second picture in the multi-frame second pictures.
  • the brightness coefficient of a frame of picture represents the degree of closeness between the display brightness of the frame of picture and the desired picture brightness of the same gray-scale value (second gray-scale value).
  • the first luminance threshold TH 1 is set according to the compensation requirements for the display device 205 .
  • the first brightness threshold TH1 may be set to 95%, thereby screening out the second picture whose display brightness does not reach 95% of the expected picture brightness as the picture to be compensated, and performing brightness compensation on it.
  • the display brightness of a frame of pictures and the expected brightness of the same gray-scale value can also be determined by comparing the difference between the display brightness of a frame of pictures and the expected picture brightness of the same gray-scale value. The degree of similarity between the brightness of the picture.
  • the display brightness of the selected reference picture can be used as the expected picture brightness, because when the at least one frame to be compensated is determined, it is considered that the picture displayed after the at least one frame to be compensated is considered as The display brightness has reached the required closeness to the desired picture brightness, and no compensation is required.
  • the trailing phenomenon caused by insufficient display brightness of several initial frame pictures is improved.
  • the color of the smear can be adjusted while improving the smearing phenomenon, which further improves the user's visual experience.
  • FIG. 4 schematically illustrates a process of determining compensation parameters according to an embodiment of the present disclosure.
  • step S401 the luminance coefficient of each frame of pictures in the multi-frame pictures is calculated.
  • the luminance coefficient of each frame of picture is calculated according to the following expression (1):
  • M( i ) represents the brightness coefficient of the ith frame of the multi-frame picture
  • Li represents the brightness of the ith frame of the picture
  • i is a natural number
  • i 1, 2, ..., N
  • N is the multi-frame picture. quantity.
  • the max ⁇ . ⁇ operator means to take the maximum value among all the values.
  • the value of N can be selected according to the test time and the performance of the product to select the number of the second pictures displayed in the test. For example, for common products, N can take a value of 3 or less. For products with poor performance, N can take a value greater than 3.
  • step S402 the brightness coefficient M(i) of each frame of pictures is compared with the preset second brightness threshold TH 2 respectively.
  • the next frame of picture that is, the i+1 th frame picture
  • the next frame picture before the next frame of picture That is, the 1st frame picture, the 2nd frame picture, ..., the ith frame picture are determined as the pictures to be compensated.
  • step S402 compare the luminance coefficients M(1) and M(2) of the first frame picture and the second frame picture with the size of the second luminance threshold TH 2 , and determine whether M(1) is satisfied ) ⁇ TH 2 and M(2) ⁇ TH 2 , as shown in step S403. If the conditions are satisfied, in step S404, the first frame is determined as the picture to be compensated, and the second frame is determined as the reference picture. If the condition is not satisfied, add 1 to i and return to step S402, compare M(2) and M(3) with TH 2 , if M(2) ⁇ TH 2 and M(3) ⁇ TH 2 are satisfied, then The first frame and the second frame are determined as the pictures to be compensated, and the third frame is determined as the reference picture.
  • step S403 If the comparison result determined in step S403 is still "No", i is incremented by 1 and returns to step S402 to continue the cyclic comparison process. If the comparison result determined in step S403 is "Yes”, then step S404 is executed, and the 1st to i frames are determined as the pictures to be compensated, and the i+1th frame is determined as the reference picture.
  • the second brightness threshold TH 2 is also used to indicate the closeness between the display brightnesses of the display images.
  • the second brightness threshold TH 2 represents the closeness of the display brightness of the picture to be compensated for at least one frame to the display brightness of the reference picture.
  • the display brightness of the reference picture is used to represent the stable display brightness after picture switching, that is, the desired picture brightness. Therefore, the second brightness threshold TH 2 represents the proportion of the display brightness of at least one frame of the picture to be compensated relative to the expected picture brightness. Compare. It should be noted that although the first brightness threshold TH 1 and the second brightness threshold TH 2 represent the same attribute, there are differences in setting basis and numerical value between the two.
  • the second brightness threshold TH 2 is the relative brightness requirement between at least one frame of the to-be-compensated picture and the reference picture on the premise that the compensation requirement can be achieved by displaying at least one frame of the to-be-compensated picture and the reference picture.
  • the second luminance threshold TH 2 may be determined according to the performance of the display device.
  • step S405 the gray scale adjustment step size G step is selected.
  • step S407 acquire the display luminance data L' 1 of at least one frame of the to-be-compensated picture and the reference picture displayed after the display picture of the display device is switched from the first grayscale value to the determined adjusted grayscale value.
  • L' 2 a display luminance data of at least one frame of the picture to be compensated
  • the reference picture displayed after the display picture of the display device is switched from the first grayscale value to the determined adjusted grayscale value includes: using the determined adjusted grayscale value
  • the grayscale value is used as the grayscale value of at least one frame of the picture to be compensated and the reference picture.
  • the display device After the display device displays the first picture with the first grayscale value, it sequentially displays at least one frame of the picture to be compensated and the reference picture, and collects at least one frame. Frame the display brightness of the picture to be compensated and the reference picture.
  • L′ 1 , L′ 2 , . . . , L′ i , L′ i+1 can be obtained with reference to the method for obtaining display luminance data of multi-frame pictures in the foregoing embodiments.
  • the number of second pictures with the second gray-scale value that is, the adjusted gray-scale value
  • the number of second pictures with the second gray-scale value that is, the adjusted gray-scale value
  • the sum of the number i.e. 1 frame).
  • step S408 according to the following expression (2), the ratio of the display brightness of the collected frames to be compensated to the display brightness of the collected reference pictures is calculated
  • M'(j) represents the ratio of the brightness L' j of the j-th frame to be compensated in the at least one frame to be compensated to the brightness L' i+1 of the reference picture, and i is the to-be-compensated determined in step S404.
  • step S409 the ratio M'(j) of the acquired display brightness of each frame to be compensated and the display brightness of the reference picture is compared with the preset first brightness threshold TH 1 , where TH 1 has the same meaning as the first luminance threshold in the foregoing embodiment. If the ratio M'(j) of the acquired brightness of the picture to be compensated to the display brightness of the reference picture is smaller than the first brightness threshold TH 1 , the process returns to step S405 , which indicates that the selected gray scale adjustment step size is small , still not enough to produce sufficient brightness.
  • Steps S405 to S409 are repeatedly performed until it is determined that the ratio M'(j) of the displayed brightness of each frame to be compensated and the displayed brightness of the reference picture is greater than or equal to the first brightness threshold TH 1 , and the loop is exited. Then in step S410, the selected gray scale adjustment step is used as the gray scale compensation value of at least one frame of the picture to be compensated.
  • two compensation parameters are determined, that is, the number of pictures to be compensated and the grayscale compensation value.
  • the compensated gray-scale value can be calculated according to the gray-scale compensation value, and the to-be-compensated pictures with the compensated gray-scale values are displayed multiple times according to the number of the to-be-compensated pictures.
  • the gray scale adjustment step size may be selected according to the tie-point voltage used by the Gamma cell included in the display device.
  • the gray scale adjustment step size can be selected as an integer multiple of the gray scale represented by the minimum resolution of the tie-point voltage of the Gamma unit.
  • the process of determining the compensation parameter in the foregoing embodiment is performed for switching a pair of grayscale values. Further, two sets of grayscale values may be traversed for switching, which are respectively recorded as the first set of grayscale values and the second set of grayscale values. , simulate the process of switching the screen grayscale value from the first grayscale value in the first set of grayscale values to the second grayscale value in the second set of grayscale values, and ensure that the first grayscale value is smaller than the second grayscale value order value.
  • the number of grayscale values contained in P and Q may not be equal, that is, m ⁇ n.
  • FIG. 5 schematically shows a process of screen switching among display screens with different grayscale values. As shown in FIG.
  • N frames of a first picture with a grayscale value G 1 are firstly displayed on the display device, then N frames of a second picture with a gray scale value G 2 are displayed, and then N frames of a gray scale value G 1 are displayed. , and then display N frames of the second picture with the grayscale value G3, and so on, can quickly complete all the switching from the grayscale value G1 to the grayscale value G2, G3, ... Gx test.
  • the process from a high-gray-scale image to a low-gray image can be performed.
  • compensation parameters can be determined for switching between multiple groups of different grayscale values, and thus a grayscale compensation value lookup table can be formed and programmed into a Display Driver IC (DDIC). , for driving the display device.
  • FIG. 6 schematically shows an example of a luminance compensation look-up table.
  • G1 when switching from the grayscale value G1 to the grayscale value G5 occurs, G1 can be selected from the column representing the first grayscale value, and G1 can be selected from the row representing the second grayscale value G 5 , the stored grayscale compensation value can be obtained from the intersection of the two.
  • "*" represents an example of the grayscale compensation value.
  • FIG. 7 schematically shows a flowchart of a method 700 for driving a display device according to another embodiment of the present disclosure. As shown in FIG. 7, the driving method 700 includes the following steps:
  • step S710 the grayscale value of the next frame to be displayed is received.
  • step S720 the grayscale value of the picture to be displayed in the next frame is compared with the grayscale value of the picture currently being displayed.
  • step S730 in the case that the grayscale value of the next frame of picture to be displayed is greater than the grayscale value of the picture currently being displayed, the brightness compensation lookup table is queried to obtain the grayscale compensation value.
  • step S740 the compensated grayscale value of the next frame of picture to be displayed is calculated according to the grayscale compensation value.
  • step S750 the display device is driven with the compensated gray scale value.
  • the grayscale compensation value in the luminance compensation lookup table in the embodiment of the present disclosure may be determined according to the method of the foregoing embodiment.
  • the specific form of the brightness compensation look-up table is shown in Figure 6.
  • the compensation parameter also includes the number of pictures to be compensated.
  • the number of pictures to be compensated can also be stored in the brightness compensation lookup table, so that when the display device is driven, the number of pictures with compensated grayscale values to be displayed is determined according to the number of pictures to be compensated.
  • the number of pictures to be compensated may be additionally stored as an independent lookup table. When driving the display device, two lookup tables can be simultaneously searched to obtain compensation parameters.
  • FIG. 8 schematically shows a block diagram of a DDIC performing the driving method 700 of the display device shown in FIG. 7 .
  • the data processor receives the grayscale value of the next frame to be displayed.
  • the data processor compares the received grayscale value of the next frame of picture to be displayed with the grayscale value of the picture currently being displayed, if it is determined that the grayscale value of the next frame of picture to be displayed is greater than the picture currently being displayed If the grayscale value is 1, the brightness compensation look-up table stored in the compensation register is called to start the compensation process.
  • the compensation process is not invoked, and the received grayscale value is directly displayed.
  • the data processor obtains the grayscale compensation value from the luminance compensation lookup table.
  • querying the brightness compensation lookup table to obtain the grayscale compensation value includes: determining a first lower limit grayscale value a and a first upper limit grayscale value in the brightness compensation lookup table according to the grayscale value m of the currently displayed picture a', such that a ⁇ m ⁇ a', according to the received grayscale value n of the next frame of picture to be displayed, determine the second lower limit grayscale value b and the second upper limit grayscale value b' in the brightness compensation lookup table , so that b ⁇ n ⁇ b', and query the brightness compensation lookup table according to a, a', b and b' to obtain the grayscale compensation value G that switches from the first lower limit grayscale value a to the second lower limit grayscale value b off (a, b), the gray scale compensation value G off (a', b), switching from the first upper limit gray scale value a' to the second lower limit gray scale value b, switching from the first lower limit gray scale value a to the th
  • the grayscale value of the displayed image is switched from m to n, m and n are not necessarily values that can be directly obtained in the luminance compensation lookup table, and a linear interpolation method is required to determine the grayscale compensation value.
  • the data processor executes the following expression (3) Calculate the compensated grayscale value m' of the next frame to be displayed:
  • the processor sends the calculated compensated grayscale value m' to the Gamma unit.
  • the Gamma unit calls the Gamma information in the Gamma register to process m' to obtain the corresponding Gamma data, and outputs the processed Gamma data to the digital-to-analog converter.
  • the digital-to-analog converter simultaneously receives the timing control signal provided by the timing controller from the timing signal latch, so as to provide the source driving circuit with the compensated data voltage according to the set timing.
  • the brightness of several initial frames in the picture switching process can be compensated by obtaining the grayscale compensation value based on the brightness compensation lookup table, thereby improving the smear phenomenon and improving the user's visual experience.
  • the data processor also obtains the number of pictures to be compensated while querying the luminance compensation lookup table, which can be obtained by reading the luminance compensation lookup table (stored in the same lookup table), or by reading Another separate lookup table (stored separately in another lookup table) to obtain.
  • the actual compensation process is associated with a relative change in the grayscale value of each frame to be displayed.
  • the grayscale values of the 6 frames to be displayed be G 1 , G 2 , G 3 , G 3 , G 3 , and G 3 in sequence, and each gray level value increases sequentially, that is, G 1 ⁇ G 2 ⁇ G 3 .
  • the compensation rule obtained by querying the brightness compensation lookup table is that when from G 1 ⁇ G 2 , 2 frames need to be compensated, and the gray-scale compensation value is G 12 ; when from G 2 ⁇ G 3 , 2 frames need to be compensated, and the gray-scale compensation value is G 23 .
  • the data processor first starts the first compensation driving process according to G 1 ⁇ G 2 , and calculates the compensated gray scale value G′ 1 according to G 12 .
  • the first compensation process it should be After displaying the picture with the gray-scale value G 1 , three frames of pictures are displayed with the compensated gray-scale value G′ 1 .
  • the data processor starts the second compensation process again according to G 2 ⁇ G 3 , and, The data processor obtains the compensated gray scale value G′ 2 according to the calculation.
  • the first compensation process will be interrupted. That is, after the first frame of the compensated picture after switching from G 1 ⁇ G 2 is displayed with the compensated gray-scale value G' 1 , the first frame after switching from G 1 ⁇ G 2 will be displayed with the compensated gray-scale value G' 2 . 2 frame compensation screen, or the 1st frame compensation screen after switching from G 2 ⁇ G 3 .
  • the data processor continues to determine that since the grayscale values of the next three frames are all G 3 , it is determined not to start the compensation process.
  • the display from G 2 ⁇ G with the compensated gray level value G′ 2 3 After the switched first frame compensation picture, continue to display the second frame compensation picture and the third frame reference picture after switching from G 2 ⁇ G 3 with the compensated grayscale value G′ 2 . After the compensation display of the initial 3-frame picture after switching from G 2 ⁇ G 3 is completed, the display continues with the uncompensated grayscale value G 3 . Therefore, the grayscale values of the actual displayed picture are G 1 , G′ 1 , G′ 2 , G′ 2 , G′ 2 , and G 3 in sequence.
  • the principle of consistent compensation rules needs to be followed in the compensation process, that is, in the process of creating the brightness compensation look-up table, if the compensated grayscale value (or the adjusted grayscale value) is used to display the reference picture to
  • the compensated grayscale value is determined, for example, as shown in step S407 in FIG. 4 , and the reference picture is also displayed using the compensated grayscale value during the driving process.
  • the step of acquiring the display brightness data of at least one frame of the picture to be compensated and the reference picture displayed after the display picture of the display device is switched from the first grayscale value to the determined grayscale value after adjustment
  • the display brightness of the reference picture is obtained by displaying the reference picture with the adjusted gray scale value, and the calculation is performed with the display brightness of the reference picture displayed with the second gray scale value. Since the display brightness of several initial frame pictures after the picture switching affects each other, it is preferable to obtain the display brightness of the reference picture by displaying the reference picture with the adjusted grayscale value.
  • the red compensation look-up table, the green compensation look-up table and the blue compensation look-up table may be created respectively, and in the step of querying the luminance compensation look-up table to obtain the gray-scale compensation value, the red compensation look-up table, the green The compensation lookup table and the blue compensation lookup table are used to obtain the red grayscale compensation value, the green grayscale compensation value and the blue grayscale compensation value respectively, and then, according to the obtained red grayscale compensation value, green grayscale compensation value and blue grayscale compensation value
  • the grayscale compensation value performs luminance compensation on the red sub-pixels, the green sub-pixels and the blue sub-pixels of the display device respectively.
  • a desired picture such as a white picture
  • a desired picture can be displayed only when the luminances of the red sub-pixels, the green sub-pixels and the blue sub-pixels all reach their respective desired luminances.
  • the brightness of one of the sub-pixels does not reach its expected brightness, it will cause the picture to change.
  • the picture will appear slightly yellow, that is, color smearing will occur. Phenomenon.
  • compensation is performed for different colors respectively, so that the color smearing phenomenon can be improved or eliminated.
  • the display brightness of a display device is closely related to the performance of the display device itself, so the compensation parameters determined for one display device are not applicable to other display devices, and each display device needs to be tested and compensated separately.
  • FIG. 9 schematically shows a block diagram of a luminance compensation apparatus according to another embodiment of the present disclosure.
  • the brightness compensation apparatus 900 includes a processor 901 and a memory 902, where machine-readable instructions are stored in the memory 902, and the processor 901 can execute these machine-readable instructions to implement the method for Brightness compensation method 100 of a display device.
  • Memory 902 may be in the form of non-volatile or volatile memory, eg, electrically erasable programmable read only memory (EEPROM), flash memory, and the like.
  • EEPROM electrically erasable programmable read only memory
  • Various components inside the brightness compensation apparatus 900 may be implemented by various devices, including but not limited to: analog circuit devices, digital circuit devices, digital signal processing (DSP) circuits, programmable processors , Application Specific Integrated Circuit (ASIC), Field Programmable Gate Array (FPGA), Programmable Logic Device (CPLD), etc.
  • DSP digital signal processing
  • ASIC Application Specific Integrated Circuit
  • FPGA Field Programmable Gate Array
  • CPLD Programmable Logic Device
  • FIG. 10 schematically shows a block diagram of a display apparatus 1000 according to another embodiment of the present disclosure.
  • a display device 1000 according to an embodiment of the present disclosure includes a display panel 1001 and a display driver DDIC 1002 according to an embodiment of the present disclosure.
  • the DDIC 1002 is connected to the display panel 1001 for driving the display panel 1001.
  • the display device 1000 according to the embodiment of the present disclosure may be any product or component with a display function, such as electronic paper, mobile phone, tablet computer, television, monitor, notebook computer, digital photo frame, and navigator.
  • the embodiments disclosed herein may be implemented on a computer program product.
  • the computer program product is a product having a computer-readable medium on which computer program logic is encoded that, when executed on a computing device, provides relevant operations to achieve The above technical solutions of the present disclosure.
  • computer program logic When executed on at least one processor of a computing system, computer program logic causes the processor to perform the operations (methods) described in the embodiments of the present disclosure.
  • Such arrangements of the present disclosure are typically provided as software, code and/or other data structures arranged or encoded on a computer-readable medium, such as an optical medium (eg, CD-ROM), a floppy or hard disk, or such as one or more Firmware or other medium of microcode on a ROM or RAM or PROM chip, or a downloadable software image in one or more modules, a shared database, etc.
  • Software or firmware or such a configuration may be installed on a computing device to cause one or more processors in the computing device to perform the technical solutions described in the embodiments of the present disclosure.

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Abstract

本公开提供了一种用于显示装置的亮度补偿方法和驱动方法，该亮度补偿方法包括：获取显示装置的显示画面从第一灰阶值切换至第二灰阶值后显示的多帧画面的显示亮度数据；根据多帧画面的显示亮度数据确定多帧画面中每帧画面的亮度系数；根据亮度系数确定多帧画面中的参考画面和至少一帧待补偿画面；以及确定至少一帧待补偿画面的灰阶补偿值，以使显示装置显示的至少一帧待补偿画面中每帧待补偿画面的显示亮度与显示的参考画面的显示亮度之比大于或等于预设第一亮度阈值。本公开还提供了一种亮度补偿装置和驱动装置。

Description

用于显示装置的亮度补偿方法、驱动方法及装置
本申请要求于2020年10月30日提交的、申请号为202011188003.4的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本公开涉及显示技术领域，更具体地，涉及一种用于显示装置的亮度补偿方法、一种显示装置的驱动方法及其装置。
背景技术
现有显示装置在显示时会存在拖尾现象。即在显示装置的屏幕上拖动对象时，在拖动对象移动的反方向上会出现非正常显示的画面。例如，在黑色背景的屏幕上拖动白色的文字会在拖动的反方向上出现深色或彩色的“尾巴”。拖尾现象严重影响了用户在使用显示装置时的视觉体验。
发明内容
本公开提供了一种用于显示装置的亮度补偿方法、一种显示装置的驱动方法及其装置，以至少部分地解决上述问题。
根据本公开的第一方面，提供了一种用于显示装置的亮度补偿方法，包括：
获取所述显示装置的显示画面从第一灰阶值切换至第二灰阶值后显示的多帧画面的显示亮度数据；
根据所述多帧画面的显示亮度数据确定所述多帧画面中每帧画面的亮度系数；
根据所述亮度系数确定所述多帧画面中的参考画面和至少一帧待补偿画面；以及
确定所述至少一帧待补偿画面的灰阶补偿值，以使所述显示装置显示的所述至少一帧待补偿画面中每帧待补偿画面的显示亮度与显示的所述参考画面的显示亮度之比大于或等于预设第一亮度阈值。
在一些实施例中，获取所述显示装置的显示画面从第一灰阶值切换至第二灰阶值后显示的多帧画面的显示亮度数据包括：
在所述显示装置显示具有第一灰阶值的第一画面之后，依次显示具有第二灰阶值的 多帧第二画面；以及
采集所述多帧第二画面的显示亮度数据。
在一些实施例中，根据如下表达式确定所述多帧画面中每帧画面的亮度系数：
M(i)＝L i/max{L 1，L 2，…，L N}
其中，M(i)表示所述多帧画面中第i帧画面的亮度系数，L i表示第i帧画面的亮度，i为自然数，i＝1，2，…，N，N为所述多帧画面的数量。
在一些实施例中，根据所述亮度系数确定所述多帧画面中的参考画面和至少一帧待补偿画面包括：
分别将所述亮度系数与预设第二亮度阈值进行比较；以及
在相邻两帧画面中的前一帧画面的亮度系数小于所述第二亮度阈值且后一帧画面的亮度系数大于或等于所述第二亮度阈值的情况下，将所述后一帧画面确定为所述参考画面，并将所述后一帧画面之前的各帧画面确定为所述至少一帧待补偿画面。
在一些实施例中，确定所述至少一帧待补偿画面的灰阶补偿值，以使所述显示装置显示的所述至少一帧待补偿画面中每帧待补偿画面的显示亮度与显示的所述参考画面的显示亮度之比大于或等于预设第一亮度阈值包括：
a.选定灰阶调整步长；
b.根据所述第二灰阶值和选定的灰阶调整步长之和来确定调整后灰阶值；
c.获取所述显示装置的显示画面从所述第一灰阶值切换至所确定的调整后灰阶值后显示的至少一帧待补偿画面和参考画面的显示亮度数据；
在所采集的各帧待补偿画面的显示亮度与所述参考画面的显示亮度之比大于所述预设第一亮度阈值的情况下，重复执行操作a至c，直到所述至少一帧待补偿画面中每帧待补偿画面的显示亮度与所述参考画面的显示亮度之比大于或等于所述预设第一亮度阈值；以及
将所选定的灰阶调整步长作为所述至少一帧待补偿画面的灰阶补偿值。
在一些实施例中，获取所述显示装置的显示画面从所述第一灰阶值切换至所确定的调整后灰阶值后显示的至少一帧待补偿画面和参考画面的显示亮度数据包括：
以所确定的调整后灰阶值作为所述至少一帧待补偿画面和所述参考画面的灰阶值，在所述显示装置显示具有第一灰阶值的第一画面之后，依次显示所述至少一帧待补偿画面和所述参考画面；以及
采集所述至少一帧待补偿画面和所述参考画面的显示亮度。
在一些实施例中，所述显示装置包括Gamma单元；
其中，所述灰阶调整步长是根据所述Gamma单元的绑点电压最小分辨率所表示的灰阶的整数倍来选定的。
在一些实施例中，所述显示画面是红色画面、绿色画面或蓝色画面，所述第一灰阶值小于所述第二灰阶值。
根据本公开的第二方面，提供了一种显示装置的驱动方法，包括：
接收待显示下一帧画面的灰阶值；
将所述待显示下一帧画面的灰阶值与当前正在显示的画面的灰阶值进行比较；
在所述待显示下一帧画面的灰阶值大于当前正在显示的画面的灰阶值的情况下，查询亮度补偿查找表以获取灰阶补偿值；
根据所述灰阶补偿值计算所述待显示下一帧画面的经补偿灰阶值；以及
利用所述经补偿灰阶值驱动所述显示装置；
其中，所述亮度补偿查找表中的灰阶补偿值是基于本公开第一方面所提供的方法确定的。
在一些实施例中，查询亮度补偿查找表以获取灰阶补偿值包括：
根据当前正在显示的画面的灰阶值m，在所述亮度补偿查找表中确定第一下限灰阶值a和第一上限灰阶值a’，使得a≤m≤a’；
根据接收到的待显示下一帧画面的灰阶值n，在所述亮度补偿查找表中确定第二下限灰阶值b和第二上限灰阶值b’，使得b≤n≤b’；以及
根据所述a、a’、b和b’查询亮度补偿查找表以获取从第一下限灰阶值a切换至第二下限灰阶值b的灰阶补偿值G off(a，b)、从第一上限灰阶值a’切换至第二下限灰阶值b的灰阶补偿值G off(a’，b)、从第一下限灰阶值a切换至第二上限灰阶值b’的灰阶补偿值G off(a，b’)和从第一上限灰阶值a’切换至第二上限灰阶值b’的灰阶补偿值G off(a’，b’)。
在一些实施例中，根据如下表达式计算所述待显示下一帧画面的经补偿灰阶值m’：
Figure PCTCN2021115960-appb-000001
在一些实施例中，所述亮度补偿查找表包括红色补偿查找表、绿色补偿查找表和蓝色补偿查找表；
其中，所述查询亮度补偿查找表以获取灰阶补偿值包括：
分别查询红色补偿查找表、绿色补偿查找表和蓝色补偿查找表以分别获取红色灰阶补偿值、绿色灰阶补偿值和蓝色灰阶补偿值。
根据本公开的第三方面，提供了一种亮度补偿装置，包括：
存储器，配置为存储程序指令；以及
处理器，配置为执行所述程序指令，以执行如本公开第一方面所提供的方法。
根据本公开的第四方面，提供了一种显示驱动器，包括：
数据处理器，包括补偿寄存器，在所述补偿寄存器中存储有亮度补偿查找表，所述亮度补偿查找表中的灰阶补偿值是基于如本公开第一方面所提供的方法确定的；
所述数据处理器被配置为：
接收待显示下一帧画面的灰阶值；
将待显示下一帧画面的灰阶值与当前正在显示的画面的灰阶值进行比较；
在待显示下一帧画面的灰阶值大于当前正在显示的画面的灰阶值的情况下，查询亮度补偿查找表以获取灰阶补偿值；
根据灰阶补偿值计算待显示下一帧画面的经补偿灰阶值；以及
利用所述经补偿灰阶值驱动显示装置。
根据本公开的第五方面，提供了一种显示装置，包括：
显示面板；以及
如本公开第四方面所提供的显示驱动器。
根据本公开实施例的技术方案，通过在显示画面切换之后对若干初始帧画面的显示亮度进行补偿，改善了由于若干初始帧画面的显示亮度不足而导致的拖尾现象。此外，通过针对红色、绿色和蓝色分别确定补偿参数，例如确定待补偿画面的数量和灰阶补偿值，可以在改善拖尾现象的同时调整拖尾的颜色，进一步提升用户的视觉体验。
附图说明
通过下面结合附图说明本公开实施例，将使本公开实施例的上述及其它目的、特征和优点更加清楚。应注意，贯穿附图，相同的元素由相同或相近的附图标记来表示。在附图中：
图1示意性地示出了根据本公开实施例的用于显示装置的亮度补偿方法的流程图；
图2示意性地示出了用于采集显示画面的显示亮度的测试装置的框图；
图3示意性地示出了画面切换后多帧显示画面的显示亮度变化；
图4示意性地示出了根据本公开实施例的确定补偿参数的过程；
图5示意性地示出了在多个不同灰阶值的显示画面之间进行画面切换的过程；
图6示意性地示出了亮度补偿查找表的示例；
图7示意性地示出了根据本公开另一实施例的显示装置的驱动方法的流程图；
图8示意性地示出了执行图7所示的显示装置的驱动方法的DDIC的框图；
图9示意性地示出了根据本公开另一实施例的亮度补偿装置的框图；以及
图10示意性地示出了根据本公开另一实施例的显示装置的框图。
具体实施方式
为使本公开实施例的目的、技术方案和优点更加清楚，下面将结合本公开实施例中的附图，对本公开实施例中的技术方案进行清楚、完整的描述。显然，所描述的实施例是本公开的一部分实施例，而不是全部。基于所描述的本公开实施例，本领域普通技术人员在无需创造性劳动的前提下获得的所有其他实施例都属于本公开保护的范围。在以下描述中，一些具体实施例仅用于描述目的，而不应该理解为对本公开有任何限制，而只是本公开实施例的示例。在可能导致对本公开的理解造成混淆时，将省略常规结构或构造。应注意，图中各部件的形状和尺寸不反映真实大小和比例，而仅示意本公开实施例的内容。
除非另外定义，本公开实施例使用的技术术语或科学术语应当是本领域技术人员所理解的通常意义。本公开实施例中使用的“第一”、“第二”以及类似词语并不表示任何顺序、数量或重要性，而只是用于区分不同的组成部分。
此外，在本公开实施例的描述中，术语“连接至”或“相连”可以是指两个组件直接连接，也可以是指两个组件之间经由一个或多个其他组件相连。此外，这两个组件可以通过有线或无线方式相连或相耦合。
图1示意性地示出了根据本公开实施例的用于显示装置的亮度补偿方法100的流程图。如图1所示，根据本公开实施例的亮度补偿方法100可以包括以下步骤。
在步骤S110中，获取显示装置的显示画面从第一灰阶值切换至第二灰阶值后显示的多帧画面的显示亮度数据。
在步骤S120中，根据多帧画面的显示亮度数据确定多帧画面中每帧画面的亮度系 数。
在步骤S130中，根据亮度系数确定多帧画面中的参考画面和至少一帧待补偿画面。
在步骤S140中，确定至少一帧待补偿画面的灰阶补偿值，以使显示装置显示的至少一帧待补偿画面中每帧待补偿画面的显示亮度与显示的参考画面的显示亮度之比大于或等于预设第一亮度阈值。
根据本公开的实施例，通过对显示装置进行画面切换的场景进行仿真，并通过对显示画面的显示亮度进行测量来获取显示装置的显示画面从第一灰阶值切换至第二灰阶值后显示的多帧画面的显示亮度数据。
在本公开的实施例中，可以采用如图2所示的测试装置来仿真显示装置进行画面切换的场景并测量显示画面的显示亮度。
图2示意性地示出了根据本公开实施例的用于采集显示画面的显示亮度的测试装置的框图。如图2所示，该测试装置包括控制器201、画面生成器202、光学测试探头203和测试载台204，在测试载台204上放置有待测试的显示装置205。根据实施例，控制器201可以是处理器或个人计算机，用于对画面生成器202和光学测试探头203的操作进行控制。画面生成器202与控制器201相连，其从控制器201接收指令，根据接收到的指令生成要在显示装置205上显示的画面，并将所生成的画面以特定的顺序发送给显示装置205进行显示。光学测试探头203用于在显示装置205显示画面的过程中对显示画面的显示亮度进行检测。测试载台204用于在测试时支撑并固定显示装置205。
根据实施例，首先将显示装置205或从显示装置205分拆的显示模组(例如显示屏)固定在测试载台204上，同时将显示装置205与画面生成器202的转接线相连接。通过控制器201向画面生成器202发出控制信号，以控制画面生成器202生成例如具有第一灰阶值的红色画面(第一画面)，并控制画面生成器202将该具有第一灰阶值的红色画面发送给显示装置205进行显示。根据实施例，可以控制画面生成器202仅生成一帧具有第一灰阶值的红色画面，则在画面切换之前仅通过显示装置205显示一帧具有第一灰阶值的红色画面。也可以控制画面生成器202生成多帧具有第一灰阶值的红色画面，则在画面切换之前通过显示装置205显示多帧具有第一灰阶值的红色画面，本公开的实施例对此不做限定。
接下来，根据实施例，继续利用控制器201控制画面生成器202生成具有第二灰阶值的多帧红色画面(第二画面)，并控制画面生成器202将该具有第二灰阶值的多帧红 色画面依次发送给显示装置205进行显示。在显示装置205显示各帧具有第二灰阶值的红色画面时，利用光学测试探头203同步采集多帧具有第二灰阶值的红色画面的显示亮度数据，并将采集到的显示亮度数据反馈给控制器201进行存储。
图3示意性地示出了画面切换后多帧显示画面的显示亮度变化。如图3所示，竖直线L1和竖直线L2之间的区域表示显示的4帧具有第一灰阶值的第一画面，竖直线L2和竖直线L3之间的区域表示显示的4帧具有第二灰阶值的第二画面。在竖直线L2处发生了具有第一灰阶值的第一画面向具有第二灰阶值的第二画面的切换，并且在发生画面切换之后的具有第二灰阶值的第1帧和第2帧的显示亮度明显小于之后的第3帧和第4帧的显示亮度。这是因为显示装置205的像素驱动电路中的存储电容充放电速度不足而导致的。在显示装置205发生画面切换时，存储电容所存储的电荷不能及时调整到所需的值，由此导致流过发光单元的电流比期望的电流低，进而导致显示画面的显示亮度偏低，显示画面的显示亮度偏低将导致拖尾现象。在本公开的实施例中，通过对上述若干初始帧画面进行亮度补偿来改善拖尾现象。
需要说明的是，在前述实施例中，仅以红色画面作为示例进行了说明，但根据实施例，可以采用其他颜色的画面，例如绿色画面或蓝色画面，以获取针对不同颜色的补偿参数，以从视觉上改善或消除彩色拖尾现象。在本公开的实施例中，可以通过控制器201控制画面生成器202分别生成红色画面、绿色画面和蓝色画面的纯色画面，并分别采集显示装置205在各不同颜色的纯色画面切换时画面的亮度变化。
此外，需要说明的是，画面生成器202生成的具有第二灰阶值的第二画面的数量可以根据显示装置205的显示性能来确定。例如，如果通过测试确定显示装置205在3帧第二画面之后的画面的显示亮度达到稳定，即认为从第4帧第二画面开始，其后的第二画面的显示亮度都可以被认为是期望的亮度，期望的亮度即显示装置205以第二灰阶值稳定地进行显示时画面的亮度。由此，可以控制画面生成器202生成4帧或多于4帧的第二画面，例如5帧第二画面、10帧第二画面等。容易理解，显示越多的第二画面，越有利于从中选择越多的画面进行亮度补偿，由此提高补偿的精度。因此，可以根据测试时间和产品的性能对测试中显示的第二画面的数量进行选择。根据产品的性能确定画面切换之后达到期望画面亮度的时间，由此确定达到期望画面亮度所需显示的画面的数量，在保证达到期望画面亮度的前提下，根据产品生产过程中的测试时间要求来选择第二画面的数量。
接下来，在从具有第一灰阶值的第一画面切换至具有第二灰阶值的第二画面的若干初始帧画面中，确定要对其进行亮度补偿的画面的数量。根据实施例，计算多帧第二画面中每帧第二画面的亮度系数，并根据多帧第二画面中每帧第二画面的亮度系数确定多帧画面中的至少一帧待补偿画面。在本公开的实施例中，一帧画面的亮度系数表示该帧画面的显示亮度与相同灰阶值(第二灰阶值)的期望画面亮度之间相接近的程度。亮度系数越大，说明画面的显示亮度越接近期望画面亮度，亮度系数越小，说明画面的显示亮度与期望画面亮度相差较大，会导致显示画面的拖尾现象，需要对其进行亮度补偿。根据实施例，根据对显示装置205的补偿要求设置第一亮度阈值TH 1。例如，如果希望显示装置205在从具有第一灰阶值的第一画面切换至具有第二灰阶值的第二画面切换时，画面切换之后初始帧画面的亮度达到期望画面亮度的95％，则可以将第一亮度阈值TH 1设置为95％，由此筛选出显示亮度未达到期望画面亮度95％的第二画面作为待补偿画面，并对其进行亮度补偿。通过一次或多次调整第二灰阶值的数值，即确定关于第二灰阶值的灰阶补偿值，来使待补偿画面的显示亮度达到期望画面亮度的95％。容易理解，在其他的实施例中，也可以通过比较一帧画面的显示亮度与相同灰阶值的期望画面亮度之间的差值，来确定该帧画面的显示亮度与相同灰阶值的期望画面亮度之间相接近的程度。
另外，在本公开的实施例中，可以以选择的参考画面的显示亮度作为期望画面亮度，这是因为在确定至少一帧待补偿画面时，认为在至少一帧待补偿画面后面显示的画面的显示亮度已经达到要求的与期望画面亮度的接近程度，不需要进行补偿。
根据本公开的实施例，通过在显示画面切换之后对若干初始帧画面的显示亮度进行补偿，改善了由于若干初始帧画面的显示亮度不足而导致的拖尾现象。此外，通过针对红色、绿色和蓝色分别确定补偿参数，例如确定待补偿画面的数量和灰阶补偿值，可以在改善拖尾现象的同时调整拖尾的颜色，进一步提升用户的视觉体验。
图4示意性地示出了根据本公开实施例的确定补偿参数的过程。
如图4所示，在步骤S401中，计算多帧画面中每帧画面的亮度系数。根据实施例，根据如下表达式(1)计算每帧画面的亮度系数：
M(i)＝L i/max{L 1，L 2，…，L N}    (1)
式中，M(i)表示多帧画面中第i帧画面的亮度系数，L i表示第i帧画面的亮度，i为自然数，i＝1，2，…，N，N为多帧画面的数量。max{.}运算符表示取所有值中的最大值。根据本公开实施例，N的取值可以根据测试时间和产品的性能对测试中显示的第二画面 的数量进行选择。例如，对于通常的产品，N可以取小于等于3的值。对于性能较差的产品，N可以取大于3的值。
接下来，在步骤S402中，分别比较每帧画面的亮度系数M(i)和预设的第二亮度阈值TH 2的大小。根据实施例，在相邻两帧画面中，例如在第i帧画面和第i+1帧画面中，如果前一帧画面的亮度系数M(i)小于第二亮度阈值TH 2且后一帧画面的亮度系数M(i+1)大于或等于第二亮度阈值TH 2，则将后一帧画面即第i+1帧画面确定为参考画面，并将后一帧画面之前的各帧画面，即第1帧画面、第2帧画面、……、第i帧画面确定为待补偿画面。如图4所示，在步骤S402中，比较第1帧画面和第2帧画面的亮度系数M(1)和M(2)与第二亮度阈值TH 2的大小，并确定是否满足M(1)＜TH 2且M(2)≥TH 2，如步骤S403所示。如果条件满足，则在步骤S404中，将第1帧确定为待补偿画面，将第2帧确定为参考画面。如果条件不满足，则将i加1并返回到步骤S402，比较M(2)和M(3)与TH 2，如果满足M(2)＜TH 2且M(3)≥TH 2，则将第1帧和第2帧确定为待补偿画面，将第3帧确定为参考画面。如果在步骤S403中确定的比较结果仍为“否”，则将i加1并返回到步骤S402继续执行循环比较的过程。如果在步骤S403中确定的比较结果为“是”，则执行步骤S404，将第1～i帧确定为待补偿画面，将第i+1帧确定为参考画面。
这里，与第一亮度阈值TH 1的含义类似，第二亮度阈值TH 2也用来表示显示画面的显示亮度之间的接近程度。例如，第二亮度阈值TH 2表示了至少一帧待补偿画面的显示亮度与参考画面的显示亮度的接近程度。根据实施例，以参考画面的显示亮度表示画面切换之后达到稳定的显示亮度，即期望画面亮度，因此，第二亮度阈值TH 2表示至少一帧待补偿画面的显示亮度相对于期望画面亮度的占比。需要注意的是，虽然第一亮度阈值TH 1和第二亮度阈值TH 2表示相同的属性，但两者在设置依据和数值上存在差异。如前所述，第一亮度阈值TH 1主要依据对显示装置的补偿要求来设置。例如，如果希望补偿后的显示装置效果更好，则可以设置相对较大的第一亮度阈值TH 1，例如设置TH 1＝98％。但同样的，较高的补偿要求会导致成本上升。而第二亮度阈值TH 2是在已经确定通过至少一帧待补偿画面和参考画面的显示就可以实现补偿要求的前提下，至少一帧待补偿画面和参考画面之间的相对亮度要求。第二亮度阈值TH 2可以依据显示装置的性能来确定。
接下来，在步骤S405中，选定灰阶调整步长G step。在步骤S406中，根据第二灰阶值和选定的灰阶调整步长之和来确定调整后灰阶值G out＝G in+G step，其中G in表示输入的 第二灰阶值，G out表示输出的调整后灰阶值。
接下来，在步骤S407中，获取显示装置的显示画面从第一灰阶值切换至所确定的调整后灰阶值后，显示的至少一帧待补偿画面和参考画面的显示亮度数据L′ 1，L′ 2，…，L′ i，L′ i+1。根据实施例，获取显示装置的显示画面从第一灰阶值切换至所确定的调整后灰阶值后显示的至少一帧待补偿画面和参考画面的显示亮度数据包括：以所确定的调整后灰阶值作为至少一帧待补偿画面和参考画面的灰阶值，在显示装置显示具有第一灰阶值的第一画面之后，依次显示至少一帧待补偿画面和参考画面，以及采集至少一帧待补偿画面和参考画面的显示亮度。可以参照前述实施例中获取多帧画面的显示亮度数据的方法获取L′ 1，L′ 2，…，L′ i，L′ i+1。需要注意的是，在该实施例中，需要显示的具有第二灰阶值(即调整后灰阶值)的第二画面的数量为所确定的至少一帧待补偿画面的数量与参考画面的数量(即1帧)之和。
接下来，在步骤S408中，根据如下表达式(2)计算所采集的各帧待补偿画面的显示亮度与所采集的参考画面的显示亮度之比，
M′(j)＝L′ j/L′ i+1     (2)
式中，M′(j)表示至少一帧待补偿画面中第j帧待补偿画面的亮度L′ j与参考画面的亮度L′ i+1之比，i为在步骤S404中确定的待补偿画面的帧数，j为自然数，j＝1，2，…，i。
接下来，在步骤S409中，将所采集的各帧待补偿画面的显示亮度与参考画面的显示亮度之比M′(j)，与预设的第一亮度阈值TH 1的大小进行比较，这里TH 1与前述实施例中第一亮度阈值的含义相同。如果所采集的各帧待补偿画面的显示亮度与参考画面的显示亮度之比M′(j)小于第一亮度阈值TH 1，则返回到步骤S405，这表明选定的灰阶调整步长小，仍不足以产生足够的亮度。重复执行步骤S405至步骤S409，直到确定所采集的各帧待补偿画面的显示亮度与参考画面的显示亮度之比M′(j)大于或等于第一亮度阈值TH 1，退出循环。然后在步骤S410中，将所选定的灰阶调整步长作为至少一帧待补偿画面的灰阶补偿值。
在该实施例中，确定了两个补偿参数，即待补偿画面的数量和灰阶补偿值。在实际应用中，可以根据灰阶补偿值计算得到经补偿灰阶值，并按照待补偿画面的数量将具有经补偿灰阶值的待补偿画面显示多次。
根据实施例，可以根据显示装置中所包括的Gamma单元使用的绑点电压来选定灰阶调整步长。例如，可以将灰阶调整步长选定为Gamma单元的绑点电压最小分辨率所 表示的灰阶的整数倍。
前述实施例中的确定补偿参数的过程是针对一对灰阶值切换进行的，进一步地，可以遍历两组灰阶值进行切换，分别记为第一组灰阶值和第二组灰阶值，对画面灰阶值从第一组灰阶值中的第一灰阶值向第二组灰阶值的第二灰阶值切换的过程进行仿真，并保证第一灰阶值小于第二灰阶值。例如，第一组灰阶值P可以包括m个第一灰阶值，即P＝{G 11，G 12，G 13，……，G 1m}，第二组灰阶值Q可以包括n个第二灰阶值，即Q＝{G 21，G 22，G 23，……，G 2n}，m和n为自然数。P和Q内所包含的灰阶值的数量可以不相等，即m≠n。在进行从第一灰阶值向第二灰阶值的切换时，对于任意一组G 1i→G 2j，其中“→”表示灰阶值之间的切换，1≤i≤m，1≤j≤n，i和j均为自然数，G 1i的数值小于G 2j的数值。在其他的实施例中，P和Q可以包括相同的灰阶值，即P＝{G 1，G 2，G 3，……，G x}，Q＝{G 1，G 2，G 3，……，G x}，如果G 1，G 2，G 3，……，G x为从小到大排列的灰阶值，则可以进行G 1→G 2、G 1→G 3、……G 1→G x、……的切换，可以遍历P和Q灰阶值的所有组合。图5示意性地示出了在多个不同灰阶值的显示画面之间进行画面切换的过程。如图5所示，先通过显示装置显示N帧具有灰阶值G 1的第一画面，然后显示N帧具有灰阶值G 2的第二画面，再接着显示N帧具有灰阶值G 1的第一画面，然后显示N帧具有灰阶值G 3的第二画面，依次类推，可以快速地完成从灰阶值G 1向灰阶值G 2、G 3、……G x切换的所有测试。进一步地，根据实施例，上述实施例中所选择的灰阶值G 1，G 2，G 3，……，G m可以均为与特定绑点电压相关联的灰阶值。
此外，需要说明的是，在本公开的实施例中，仅仿真了显示装置从低灰阶画面向高灰阶画面切换时的场景。这是因为，虽然显示装置在从高灰阶画面向低灰阶画面切换时也会导致拖尾现象，但从画面的显示上并不能分辨出来，即人眼并不能分辨出这种情况下的拖尾，也就是说这种情况下的拖尾不会影响用户的视觉体验。但容易理解的是，可以利用光学测试探头来检测亮度，因此，可以基于本公开实施例的从低灰阶画面向高灰阶画面切换时的场景的仿真原理来进行从高灰阶画面向低灰阶画面切换的场景的仿真。
根据本公开的实施例，可以分别针对多组不同灰阶值之间的切换确定补偿参数，并由此构成灰阶补偿值查找表，并烧录进显示驱动器IC(Display Driver IC，DDIC)中，以用于驱动显示装置。图6示意性地示出了亮度补偿查找表的示例。如图6所示，在发生从灰阶值G 1到灰阶值G 5的切换时，可以从表示第一灰阶值的列中选中G 1，从表示第二灰阶值的行中选中G 5，可以从两者相交处获取所存储的灰阶补偿值。如图6所示，“*” 表示灰阶补偿值的示例。
图7示意性地示出了根据本公开另一实施例的显示装置的驱动方法700的流程图。如图7所示，驱动方法700包括以下步骤：
在步骤S710中，接收待显示下一帧画面的灰阶值。
在步骤S720中，将待显示下一帧画面的灰阶值与当前正在显示的画面的灰阶值进行比较。
在步骤S730中，在待显示下一帧画面的灰阶值大于当前正在显示的画面的灰阶值的情况下，查询亮度补偿查找表以获取灰阶补偿值。
在步骤S740中，根据灰阶补偿值计算待显示下一帧画面的经补偿灰阶值。
在步骤S750中，利用经补偿灰阶值驱动显示装置。
本公开实施例中的亮度补偿查找表中的灰阶补偿值可以是根据前述实施例的方法所确定的。亮度补偿查找表的具体形式如图6所示。进一步地，补偿参数还包括待补偿画面的数量。在本实施例中，还可以在亮度补偿查找表中存储待补偿画面的数量，以在驱动显示装置时，根据待补偿画面的数量确定要显示的具有经补偿灰阶值的画面的次数。在一些其他的实施例中，也可以将待补偿画面的数量另外存储成一个独立的查找表。在驱动显示装置时，可以同时查找两个查找表获取补偿参数。
图8示意性地示出了执行图7所示的显示装置的驱动方法700的DDIC的框图。如图8所示，首先由数据处理器接收待显示下一帧画面的灰阶值。然后，数据处理器将所接收的待显示下一帧画面的灰阶值与当前正在显示的画面的灰阶值进行比较，如果确定待显示下一帧画面的灰阶值大于当前正在显示的画面的灰阶值，则调用补偿寄存器中所存储的亮度补偿查找表，启动补偿过程。如果确定待显示下一帧画面的灰阶值小于或等于当前正在显示的画面的灰阶值，则不调用补偿过程，直接以接收的灰阶值进行显示。在启动补偿过程之后，数据处理器从亮度补偿查找表中获取灰阶补偿值。根据实施例，查询亮度补偿查找表以获取灰阶补偿值包括：根据当前正在显示的画面的灰阶值m，在亮度补偿查找表中确定第一下限灰阶值a和第一上限灰阶值a’，使得a≤m≤a’，根据接收到的待显示下一帧画面的灰阶值n，在亮度补偿查找表中确定第二下限灰阶值b和第二上限灰阶值b’，使得b≤n≤b’，以及根据a、a’、b和b’查询亮度补偿查找表以获取从第一下限灰阶值a切换至第二下限灰阶值b的灰阶补偿值G off(a，b)、从第一上限灰阶值a’切换至第二下限灰阶值b的灰阶补偿值G off(a’，b)、从第一下限灰阶值a切换至第二 上限灰阶值b’的灰阶补偿值G off(a，b’)和从第一上限灰阶值a’切换至第二上限灰阶值b’的灰阶补偿值G off(a’，b’)。
在该实施例中，显示画面的灰阶值从m切换至n，m和n不一定是可以在亮度补偿查找表中直接获得的值，需要利用线性插值的方法来确定灰阶补偿值。在查询得到G off(a，b)、G off(a’，b)、G off(a，b’)和G off(a’，b’)之后，数据处理器根据如下表达式(3)计算待显示下一帧画面的经补偿灰阶值m’：
Figure PCTCN2021115960-appb-000002
接下来，如图8所示，处理器将计算得到的经补偿灰阶值m’发送给Gamma单元。Gamma单元调用Gamma寄存器中的Gamma信息对m’进行处理以得到对应的Gamma数据，并将处理得到的Gamma数据输出至数模转换器。数模转换器同时从时序信号锁存器中接收由时序控制器提供的时序控制信号，以根据设定的时序向源驱动电路提供经补偿的数据电压。
根据本公开实施例的驱动方法，可以通过基于亮度补偿查找表获取灰阶补偿值，来对画面切换过程中的若干初始帧画面的亮度进行补偿，从而改善拖尾现象，提升用户的视觉体验。
根据实施例，数据处理器在查询亮度补偿查找表的同时还要获取待补偿画面的数量，这可以通过读取亮度补偿查找表(存储在同一个查找表中)来获得，也可以通过读取另一个单独的查找表(单独存储在另一个查找表中)来获得。
根据实施例，实际的补偿过程与要显示的每帧画面的灰阶值的相对变化相关联。举例而言，令要显示的6帧画面的灰阶值依次为G 1、G 2、G 3、G 3、G 3、G 3，各灰阶值依次增加，即G 1＜G 2＜G 3。查询亮度补偿查找表获得的补偿规则是，从G 1→G 2时，需要补偿2帧，灰阶补偿值为G 12；从G 2→G 3时，需要补偿2帧，灰阶补偿值为G 23。则补偿驱动时，数据处理器首先根据G 1＜G 2来启动第一个补偿驱动过程，并根据G 12计算得到经补偿灰阶值G′ 1，在该第一个补偿过程中，应该在显示完灰阶值为G 1的画面之后以经补偿灰阶值G′ 1显示3帧画面。然而，在以经补偿灰阶值G′ 1显示完从G 1→G 2切换后的第1帧补偿画面之后，数据处理器又根据G 2＜G 3启动了第二个补偿过程，并且，数据处理器根据计算得到经补偿灰阶值G′ 2。根据实施例，如果第一个补偿过程和第二个补偿过程存在叠加，第一个补偿过程将被中断。即在以经补偿灰阶值G′ 1显示完从G 1→G 2切换后的第1帧补偿画面之后，将以经补偿灰阶值G′ 2显示从G 1→G 2切换后的第2 帧补偿画面，或从G 2→G 3切换后的第1帧补偿画面。接下来，数据处理器继续进行确定，由于之后的3帧画面的灰阶值均为G 3，因此确定不启动补偿过程，因此，在以经补偿灰阶值G′ 2显示从G 2→G 3切换后的第1帧补偿画面之后，继续以经补偿灰阶值G′ 2显示从G 2→G 3切换后的第2帧补偿画面和第3帧参考画面。在完成对从G 2→G 3切换后的初始3帧画面的补偿显示之后，以未经补偿的灰阶值G 3继续显示。因此，实际显示画面的灰阶值依次为G 1、G′ 1、G′ 2、G′ 2、G′ 2、G 3。
另外，需要说明的是，在补偿过程中需要遵循补偿规则一致的原则，即在创建亮度补偿查找表的过程中，如果采用经补偿灰阶值(或调整后灰阶值)来显示参考画面来确定补偿灰阶值，例如在图4中的步骤S407中所示，则在驱动过程中，也采用经补偿灰阶值显示参考画面。例如，在要显示灰阶值依次为G 1、G 2、G 3、G 3、G 3、G 3的6帧画面的实施例中，虽然从G 2到G 3切换时，需要显示2帧待补偿画面，但实际显示的时候却显示了3帧，即2帧待补偿画面和1帧参考画面。这是因为在创建亮度补偿查找表时，在根据待补偿画面的显示亮度与参考画面的显示亮度之比确定灰阶补偿值的时候，是利用经过补偿的参考画面的显示亮度确定的灰阶补偿值。容易理解，也可以在获取显示装置的显示画面从第一灰阶值切换至所确定的调整后灰阶值后显示的至少一帧待补偿画面和参考画面的显示亮度数据的步骤中，不通过以调整后灰阶值显示参考画面来获取参考画面的显示亮度，而是以第二灰阶值显示的参考画面的显示亮度来进行计算。由于画面切换后的若干初始帧画面之间的显示亮度是相互影响的，因此优选通过以调整后灰阶值显示参考画面来获取参考画面的显示亮度。
另外，根据实施例，可以分别创建红色补偿查找表、绿色补偿查找表和蓝色补偿查找表，并且，在查询亮度补偿查找表以获取灰阶补偿值的步骤中分别查询红色补偿查找表、绿色补偿查找表和蓝色补偿查找表以分别获取红色灰阶补偿值、绿色灰阶补偿值和蓝色灰阶补偿值，然后，根据所获取的红色灰阶补偿值、绿色灰阶补偿值和蓝色灰阶补偿值分别对显示装置的红色子像素、绿色子像素和蓝色子像素进行亮度补偿。这是因为，只有在红色子像素、绿色子像素和蓝色子像素的亮度均达到各自期望的亮度时才能表现出期望的画面，例如白色画面。如果其中某一子像素的亮度未达到其期望的亮度，则将导致画面变化，例如如果蓝色子像素的亮度未达到其期望的亮度，则画面将呈现出轻微的黄色，即产生彩色拖尾现象。根据本公开的实施例，分别针对不同的颜色进行补偿，能够改善或消除彩色拖尾现象。
另外，还需要说明的是，显示装置的显示亮度与显示装置自身的性能密切相关，因此针对一个显示装置所确定的补偿参数不适用于其他显示装置，需要针对每个显示装置分别测试和补偿。
图9示意性地示出了根据本公开另一实施例的亮度补偿装置的框图。如图9所示，该亮度补偿装置900包括处理器901和存储器902，在存储器902中存储有机器可读指令，处理器901可以执行这些机器可读指令来实现根据本公开实施例的用于显示装置的亮度补偿方法100。
存储器902可以具有以下形式：非易失性或易失性存储器，例如，电可擦除可编程只读存储器(EEPROM)、闪存等。
根据本公开实施例的亮度补偿装置900内部的各种组件可以通过多种器件来实现，这些器件包括但不限于：模拟电路器件、数字电路器件、数字信号处理(DSP)电路、可编程处理器、专用集成电路(ASIC)、现场可编程门阵列(FPGA)、可编程逻辑器件(CPLD)，等等。
图10示意性地示出了根据本公开另一实施例的显示装置1000的框图。如图10所示，根据本公开实施例的显示装置1000包括显示面板1001和根据本公开实施例的显示驱动器DDIC 1002。DDIC 1002与显示面板1001相连，用于驱动显示面板1001。根据本公开实施例的显示装置1000可以是电子纸、手机、平板电脑、电视机、显示器、笔记本电脑、数码相框、导航仪等任何具有显示功能的产品或部件。
此外，本文所公开的实施例可以在计算机程序产品上实现。更具体地，该计算机程序产品是如下的一种产品：具有计算机可读介质，计算机可读介质上编码有计算机程序逻辑，当在计算设备上执行时，该计算机程序逻辑提供相关的操作以实现本公开的上述技术方案。当在计算系统的至少一个处理器上执行时，计算机程序逻辑使得处理器执行本公开实施例所述的操作(方法)。本公开的这种设置典型地提供为设置或编码在例如光介质(例如CD-ROM)、软盘或硬盘等的计算机可读介质上的软件、代码和/或其他数据结构、或者诸如一个或多个ROM或RAM或PROM芯片上的固件或微代码的其他介质、或一个或多个模块中的可下载的软件图像、共享数据库等。软件或固件或这种配置可安装在计算设备上，以使得计算设备中的一个或多个处理器执行本公开实施例所描述的技术方案。
应当注意的是，在以上的描述中，仅以示例的方式，示出了本公开实施例的技术方 案，但并不意味着本公开实施例局限于上述步骤和结构。在可能的情形下，可以根据需要对步骤和结构进行调整和取舍。因此，某些步骤和单元并非实施本公开实施例的总体发明思想所必需的元素。
至此已经结合优选实施例对本公开进行了描述。应该理解，本领域技术人员在不脱离本公开实施例的精神和范围的情况下，可以进行各种其它的改变、替换和添加。因此，本公开实施例的范围不局限于上述特定实施例，而应由所附权利要求所限定。

Claims (15)

  1. 一种用于显示装置的亮度补偿方法，包括：
    获取所述显示装置的显示画面从第一灰阶值切换至第二灰阶值后显示的多帧画面的显示亮度数据；
    根据所述多帧画面的显示亮度数据确定所述多帧画面中每帧画面的亮度系数；
    根据所述亮度系数确定所述多帧画面中的参考画面和至少一帧待补偿画面；以及
    确定所述至少一帧待补偿画面的灰阶补偿值，以使所述显示装置显示的所述至少一帧待补偿画面中每帧待补偿画面的显示亮度与显示的所述参考画面的显示亮度之比大于或等于预设第一亮度阈值。
  2. 根据权利要求1所述的方法，其中，获取所述显示装置的显示画面从第一灰阶值切换至第二灰阶值后显示的多帧画面的显示亮度数据包括：
    在所述显示装置显示具有第一灰阶值的第一画面之后，依次显示具有第二灰阶值的多帧第二画面；以及
    采集所述多帧第二画面的显示亮度数据。
  3. 根据权利要求1或2所述的方法，其中，根据如下表达式确定所述多帧画面中每帧画面的亮度系数：
    M(i)＝L i/max{L 1，L 2，…，L N}
    其中，M(i)表示所述多帧画面中第i帧画面的亮度系数，L i表示第i帧画面的亮度，i为自然数，i＝1，2，…，N，N为所述多帧画面的数量。
  4. 根据权利要求1所述的方法，其中，根据所述亮度系数确定所述多帧画面中的参考画面和至少一帧待补偿画面包括：
    分别将所述亮度系数与预设第二亮度阈值进行比较；以及
    在相邻两帧画面中的前一帧画面的亮度系数小于所述第二亮度阈值且后一帧画面的亮度系数大于或等于所述第二亮度阈值的情况下，将所述后一帧画面确定为所述参考画面，并将所述后一帧画面之前的各帧画面确定为所述至少一帧待补偿画面。
  5. 根据权利要求1所述的方法，其中，确定所述至少一帧待补偿画面的灰阶补偿值，以使所述显示装置显示的所述至少一帧待补偿画面中每帧待补偿画面的显示亮度与显示的所述参考画面的显示亮度之比大于或等于预设第一亮度阈值包括：
    a.选定灰阶调整步长；
    b.根据所述第二灰阶值和选定的灰阶调整步长之和来确定调整后灰阶值；
    c.获取所述显示装置的显示画面从所述第一灰阶值切换至所确定的调整后灰阶值后显示的至少一帧待补偿画面和参考画面的显示亮度数据；
    在所采集的各帧待补偿画面的显示亮度与所述参考画面的显示亮度之比小于所述预设第一亮度阈值的情况下，重复执行操作a至c，直到所述至少一帧待补偿画面中每帧待补偿画面的显示亮度与所述参考画面的显示亮度之比大于或等于所述预设第一亮度阈值；以及
    将所选定的灰阶调整步长作为所述至少一帧待补偿画面的灰阶补偿值。
  6. 根据权利要求5所述的方法，其中，获取所述显示装置的显示画面从所述第一灰阶值切换至所确定的调整后灰阶值后显示的至少一帧待补偿画面和参考画面的显示亮度数据包括：
    以所确定的调整后灰阶值作为所述至少一帧待补偿画面和所述参考画面的灰阶值，在所述显示装置显示具有第一灰阶值的第一画面之后，依次显示所述至少一帧待补偿画面和所述参考画面；以及
    采集所述至少一帧待补偿画面和所述参考画面的显示亮度。
  7. 根据权利要求5或6所述的方法，其中，所述显示装置包括Gamma单元；
    其中，所述灰阶调整步长是根据所述Gamma单元的绑点电压最小分辨率所表示的灰阶的整数倍来选定的。
  8. 根据权利要求2所述的方法，其中，所述显示画面是红色画面、绿色画面或蓝色画面，所述第一灰阶值小于所述第二灰阶值。
  9. 一种显示装置的驱动方法，包括：
    接收待显示下一帧画面的灰阶值；
    将所述待显示下一帧画面的灰阶值与当前正在显示的画面的灰阶值进行比较；
    在所述待显示下一帧画面的灰阶值大于当前正在显示的画面的灰阶值的情况下，查询亮度补偿查找表以获取灰阶补偿值；
    根据所述灰阶补偿值计算所述待显示下一帧画面的经补偿灰阶值；以及
    利用所述经补偿灰阶值驱动所述显示装置；
    其中，所述亮度补偿查找表中的灰阶补偿值是基于如权利要求1至7中任一项所 述的方法确定的。
  10. 根据权利要求9所述的方法，其中，查询亮度补偿查找表以获取灰阶补偿值包括：
    根据当前正在显示的画面的灰阶值m，在所述亮度补偿查找表中确定第一下限灰阶值a和第一上限灰阶值a’，使得a≤m≤a’；
    根据接收到的待显示下一帧画面的灰阶值n，在所述亮度补偿查找表中确定第二下限灰阶值b和第二上限灰阶值b’，使得b≤n≤b’；以及
    根据所述a、a’、b和b’查询亮度补偿查找表以获取从第一下限灰阶值a切换至第二下限灰阶值b的灰阶补偿值G off(a，b)、从第一上限灰阶值a’切换至第二下限灰阶值b的灰阶补偿值G off(a’，b)、从第一下限灰阶值a切换至第二上限灰阶值b’的灰阶补偿值G off(a，b’)和从第一上限灰阶值a’切换至第二上限灰阶值b’的灰阶补偿值G off(a’，b’)。
  11. 根据权利要求10所述的方法，其中，根据如下表达式计算所述待显示下一帧画面的经补偿灰阶值m’：
    Figure PCTCN2021115960-appb-100001
  12. 根据权利要求9所述的方法，其中，所述亮度补偿查找表包括红色补偿查找表、绿色补偿查找表和蓝色补偿查找表；
    其中，所述查询亮度补偿查找表以获取灰阶补偿值包括：
    分别查询红色补偿查找表、绿色补偿查找表和蓝色补偿查找表以分别获取红色灰阶补偿值、绿色灰阶补偿值和蓝色灰阶补偿值。
  13. 一种亮度补偿装置，包括：
    存储器，配置为存储程序指令；以及
    处理器，配置为执行所述程序指令，以执行如权利要求1至8中任一项所述的方法。
  14. 一种显示驱动器，包括：
    数据处理器，包括补偿寄存器，在所述补偿寄存器中存储有亮度补偿查找表，所述亮度补偿查找表中的灰阶补偿值是基于如权利要求1至7中任一项所述的方法确定的；
    所述数据处理器被配置为：
    接收待显示下一帧画面的灰阶值；
    将待显示下一帧画面的灰阶值与当前正在显示的画面的灰阶值进行比较；
    在待显示下一帧画面的灰阶值大于当前正在显示的画面的灰阶值的情况下，查询亮度补偿查找表以获取灰阶补偿值；
    根据灰阶补偿值计算待显示下一帧画面的经补偿灰阶值；以及
    利用所述经补偿灰阶值驱动显示装置。
  15. 一种显示装置，包括：
    显示面板；以及
    如权利要求14所述的显示驱动器。
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