WO2015043262A1 - 显示补偿方法、装置及显示补偿系统 - Google Patents

显示补偿方法、装置及显示补偿系统 Download PDF

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Publication number
WO2015043262A1
WO2015043262A1 PCT/CN2014/080899 CN2014080899W WO2015043262A1 WO 2015043262 A1 WO2015043262 A1 WO 2015043262A1 CN 2014080899 W CN2014080899 W CN 2014080899W WO 2015043262 A1 WO2015043262 A1 WO 2015043262A1
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Prior art keywords
value
brightness
pixel
display
compensation
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PCT/CN2014/080899
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English (en)
French (fr)
Inventor
田栋协
柳奉烈
安星俊
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京东方科技集团股份有限公司
鄂尔多斯市源盛光电有限责任公司
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Priority to US14/429,086 priority Critical patent/US9483976B2/en
Publication of WO2015043262A1 publication Critical patent/WO2015043262A1/zh

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Classifications

    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/22Control 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
    • G09G3/30Control 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
    • G09G3/32Control 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]
    • G09G3/3208Control 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]
    • G09G3/3225Control 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
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/006Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/02Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the way in which colour is displayed
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00Control of display operating conditions
    • G09G2320/02Improving the quality of display appearance
    • G09G2320/0285Improving the quality of display appearance using tables for spatial correction of display data
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00Control of display operating conditions
    • G09G2320/06Adjustment of display parameters
    • G09G2320/0626Adjustment of display parameters for control of overall brightness
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00Control of display operating conditions
    • G09G2320/06Adjustment of display parameters
    • G09G2320/0666Adjustment of display parameters for control of colour parameters, e.g. colour temperature
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00Control of display operating conditions
    • G09G2320/06Adjustment of display parameters
    • G09G2320/0693Calibration of display systems
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00Control of display operating conditions
    • G09G2320/08Arrangements within a display terminal for setting, manually or automatically, display parameters of the display terminal
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00Aspects of the architecture of display systems
    • G09G2360/14Detecting light within display terminals, e.g. using a single or a plurality of photosensors
    • G09G2360/145Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light originating from the display screen
    • G09G2360/147Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light originating from the display screen the originated light output being determined for each pixel
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/10Intensity circuits
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N17/00Diagnosis, testing or measuring for television systems or their details
    • H04N17/04Diagnosis, testing or measuring for television systems or their details for receivers

Definitions

  • the invention relates to a display compensation method, device and display compensation system. Background technique
  • OLED Organic Light Emitting Diode
  • PMOLED Passive Matrix Driving OLED
  • AMOLED Active Matrix Driving OLED
  • the TFT switching circuit uses a low temperature polysilicon thin film transistor (LTPS TFT) or an oxide thin film transistor (Oxide TFT).
  • LTPS TFT low temperature polysilicon thin film transistor
  • Oxide TFT oxide thin film transistor
  • ALD-Si TFTs general amorphous silicon transistors
  • LTPS TFTs and Oxide TFTs have higher mobility and more stable characteristics, and are more suitable for use in AMOLED displays.
  • the TFT switching circuit fabricated on the large-area glass substrate often exhibits non-uniformity in electrical parameters such as threshold voltage and mobility, thereby making the threshold voltage of each TFT biased.
  • the shift is inconsistent, which causes the current difference and the brightness difference of the OLED display device to be perceived by the human eye, thereby causing a problem that the display effect is not uniform between the pixels. Even if gray scale voltage of the same gray level is applied to all pixels, the unevenness between the pixels will cause uneven brightness between the pixels, resulting in degradation of display quality and seriously affecting the user's use. Feel. Summary of the invention
  • a display compensation method including: performing brightness measurement on each pixel in a full-color test screen output by the display device when a display device in an uncompensated state outputs a full-color test screen Obtaining a reference brightness value according to the measured brightness value of each pixel; obtaining a compensation coefficient of each of the pixels according to the reference brightness value and the brightness value of each of the pixels; respectively, according to the compensation coefficient A signal of each of the pixels is input for compensation correction.
  • a display compensation apparatus comprising: a measurement unit configured to be in a full-color test screen outputted to the display device when a display device in an uncompensated state outputs a full-color test screen Each of the pixels performs brightness measurement; the calculating unit is configured to obtain a reference brightness value according to the measured brightness value of each of the pixels; and the processing unit is configured to be configured according to the reference brightness value and each of the pixels The luminance value obtains a compensation coefficient for each of the pixels; and a compensation unit configured to perform compensation correction on the signal input to each of the pixels according to the compensation coefficient.
  • a display compensation system comprising: a display device and a display compensation device as described above.
  • a display compensation method, apparatus, and display compensation system when a display device in an uncompensated state outputs a full-color test screen, brightness is measured by each pixel in the full-color test screen output from the display device, And obtaining a reference brightness value according to the measured brightness value of each pixel, obtaining a compensation coefficient for each pixel according to the reference brightness value and the brightness value of each pixel, and further performing signal input to each pixel according to the compensation coefficient. Compensation correction.
  • the reference brightness obtains a compensation coefficient, and the brightness compensation of each pixel is corrected to the reference brightness by the compensation coefficient, which can effectively improve the display effect of the display device, and greatly improve the display effect of the display device.
  • FIG. 1 is a schematic flowchart of a display compensation method according to an embodiment of the present invention.
  • FIG. 2 is a schematic flowchart of another display compensation method according to an embodiment of the present invention.
  • FIG. 3 is a schematic structural diagram of a display compensation apparatus according to an embodiment of the present invention.
  • FIG. 4 is a schematic structural diagram of another display compensation device according to an embodiment of the present invention
  • FIG. 5 is a schematic structural diagram of a display compensation system according to an embodiment of the present invention. detailed description
  • FIG. 1 shows a display compensation method provided by an embodiment of the present invention.
  • step S101 when the display device in the uncompensated state outputs the full-color test screen, luminance measurement is performed on each pixel in the full-color test screen output from the display device.
  • step S102 a reference luminance value is obtained based on the measured luminance value of each pixel.
  • a value may be selected as a reference brightness value according to a preset formula or manually within a range of the values, and each pixel is adjusted according to the reference brightness value. Brightness, thereby achieving uniformity of display brightness per pixel of the display device. For example, an average value can be obtained from the measured luminance value of each pixel, and the average value is used as the reference luminance value.
  • step S103 a compensation coefficient for each pixel is obtained based on the reference luminance value and the luminance value of each pixel.
  • step S104 the signals input to each pixel are separately corrected for compensation according to the compensation coefficient.
  • the compensation coefficient of each pixel may be a numerical relationship between the brightness of the pixel and the reference brightness value, and the input signal (such as voltage or current) of the pixel is further adjusted according to the value relationship, thereby implementing compensation correction; or
  • the compensation coefficient of each pixel may also be a numerical relationship between the input signal of the pixel and the standard input signal corresponding to the reference luminance value, and the compensation correction of the pixel input signal may be directly guided according to the numerical relationship.
  • a display compensation method when a display device in an uncompensated state outputs a full-color test screen, brightness is measured by each pixel in the full-color test picture outputted from the display device, and then according to each measured The luminance value of one pixel obtains a reference luminance value, and a compensation coefficient for each pixel is obtained according to the reference luminance value and the luminance value of each pixel, and the signal input to each pixel is separately compensated and corrected according to the compensation coefficient.
  • the compensation coefficient can be obtained according to the actual brightness of each pixel and the reference brightness, and the brightness compensation of each pixel is corrected to the reference brightness by the compensation coefficient, thereby effectively improving the display.
  • the uncompensated state of the display device may specifically include an initial state when the display device is powered on for the first time, or may be an artificially set one for compensating brightness according to actual needs of the user during use of the display device. Test status.
  • the embodiment of the present invention mainly uses the full-color test screen to examine the brightness of each pixel. It is conceivable that, in an ideal case, when performing one-frame full-color picture display, the brightness of the full-color test picture output by each pixel of the display device should be the same, and the same brightness value is the reference brightness value. Since the brightness value of each pixel is the same as the reference brightness value, there is no need to compensate the signal of the input pixel.
  • the full-color test screen specifically refers to such a display screen in which all pixels of the display device display the same color.
  • the full color test screen may specifically include an all white test screen, or the full color test screen may further include a full red test screen, a full green test screen, and a full blue test screen.
  • the brightness of the color displayed by each pixel in the full-color test picture should be equal to the preset brightness gray level, wherein the preset brightness gray level can be freely selected according to actual needs, due to 8 bit
  • the range of the gray scale is usually 0 to 255, where 0 is the darkest and 255 is the brightest.
  • the luminance gray scale of the full-color test screen is preferably 255 gray scale.
  • the display compensation method provided by the embodiment of the present invention can be as shown in FIG. 2 .
  • step S101 in FIG. 1 may be specifically implemented by step S201 in FIG. 2, that is, the brightness measurement of each pixel in the full-color test picture outputted by the display device may be: Step S201, performing luminance measurement of a red R value, a green G value, and a blue B value for each pixel in the full color test screen output by the display device.
  • the white light is usually composed of three colors of red, green and blue (RGB) in a certain proportion
  • RGB red, green and blue
  • the full-color test screen uses the full red test screen, the all-green test screen, and the full blue test screen
  • the full red test screen, the all-green test screen, and the full blue test screen can all use the gray of 255 brightness. Step, you can use the corresponding measuring instrument to measure the RGB brightness of the full red test picture, the all green test picture and the full blue test picture, so that you can The color brightness difference is accurately compensated.
  • step S102 in FIG. 1 may be specifically implemented by step S202 in FIG. 2 according to an embodiment of the present invention.
  • step S202 the reference R value luminance, the reference G value luminance, and the reference B value luminance are respectively obtained based on the measured R value, G value, and B value luminance of each pixel.
  • a value may be selected as the reference brightness value within the range of the values, and the brightness of the pixel is adjusted according to the reference brightness value, thereby realizing display of each pixel of the display device. Uniform brightness.
  • the user can select the reference brightness value by using various methods according to actual needs, and the present invention does not limit this.
  • the manner in which the reference luminance value is selected is mainly used in the following three manners.
  • the average value of the brightness of all the pixels can be calculated from the measured brightness value of each pixel, and the average value of the brightness is used as the reference brightness value.
  • the method of obtaining the average value of the brightness of each pixel is usually simple, and the circuit structure for realizing the calculation process is relatively simple.
  • the difference in brightness of each pixel generally satisfies a random distribution, and the average brightness value as a reference value is usually closer to the current brightness setting of the display device, so that compensation can be minimized as much as possible.
  • the number of pixels increases the efficiency of display compensation.
  • Such a reference brightness value calculation method can avoid compensating the brightness of the pixel having the brightness by using the brightness value with the highest probability of occurrence as the reference brightness value, especially when only a small portion of the display device is uneven in brightness. ⁇ Using such a reference brightness value selection method can change the efficiency of display compensation to the greatest extent without changing most pixels with uniform brightness.
  • the reference brightness value can be obtained simply and quickly, and the circuit structure is simple, but the disadvantage is that, as a fast selection mode, other pixels except the most value point are excluded. The compensation of the brightness is required, which greatly reduces the efficiency of display compensation.
  • the selection method of the above three reference brightness values is merely an example, it should be thought that The user can also select other various known reference value selection methods according to the actual needs of the user, which is not limited by the embodiment of the present invention.
  • step S203 a compensation coefficient for each pixel is obtained based on the reference luminance value and the luminance value of each pixel.
  • the level of the input signal when there is a difference between the brightness of a pixel and the reference brightness, the level of the input signal may be correspondingly changed by multiplying the level of the input signal by the compensation coefficient to correct the pixel.
  • the brightness, the acquisition of the compensation coefficient can be used in various ways, and the present invention is not limited thereto.
  • the reference R value luminance may be respectively divided by the R value luminance of each pixel, and the reference G value luminance is respectively divided by each pixel.
  • the G value brightness, the reference B value brightness is divided by the B value brightness of each pixel, respectively, so that the R component compensation coefficient, the G component compensation coefficient, and the B component compensation coefficient of each pixel can be obtained separately.
  • the measurement device performs RGB three-color luminance measurement on each pixel in the display device, and assumes that the measured quantization value of the luminance of the pixel is respectively R value brightness 80, The G value is 100, the B value is 80, and the brightness ratio of the three colors in white light is not the same.
  • the luminance of the reference R value calculated based on the luminance values of all the pixels is 100
  • the luminance of the reference G value is 100
  • the luminance of the reference B value is 70. This indicates that the luminance of the pixel is too low due to the R value, and the luminance of the B value is too high.
  • the R component compensation coefficient is 1.25
  • the G component compensation coefficient is 1
  • the B component compensation coefficient is 0.875 for the pixel, so that the compensation coefficient can be multiplied by the RGB signal input to the pixel, respectively.
  • the display brightness of the pixel and the reference value is made uniform.
  • step S204 the compensation coefficients are stored in the non-volatile memory to compensate for the correction of the signal of each pixel when the display device is turned on or reset.
  • the non-volatile memory may specifically be various known non-volatile storage hardware including a hard disk.
  • the obtained compensation coefficient does not disappear due to the power failure of the storage medium, and is stored in the nonvolatile state when the user reopens the display device or the display device completes the reset operation.
  • the compensation coefficient of each pixel in the memory will be directly multiplied by the RGB pixel signal to achieve a compensated output of the pixel luminance.
  • step S205 the signals input to each pixel are separately compensated and corrected according to the compensation coefficient.
  • a pixel may also have a change in brightness due to the illumination of external light or a slight change in the drive current or voltage.
  • the change in brightness usually has a small change range and a change time. Short, if the change happens to occur in the measurement phase of display compensation, unnecessary compensation will occur, which is also not conducive to achieving uniformity of display of the display device. In order to avoid the influence of reasonable random variation on the display compensation, you can set the value or the value of the time to minimize the good pixel points that cause the brightness change due to random interference, and find the dead pixels with uneven brightness.
  • the absolute value of the difference between the measured brightness value of each pixel and the reference brightness value is within a preset value range, wherein the preset The value range can be set arbitrarily according to the actual situation. Specifically, if the absolute value of the difference is within a preset value range, determining that the pixel is a reasonable random change point does not need to perform display compensation; if the absolute value of the difference is not within a preset value range, determining the The pixel is a dead pixel, and the signal input to the pixel is compensated and corrected according to the compensation coefficient of the pixel.
  • the above method for determining the dead pixel is only an example. The user can also select other known dead point determination methods according to actual conditions, and the embodiments of the present invention are not listed here.
  • the display compensation method of the embodiment of the present invention when the display device in the uncompensated state outputs the full-color test screen, the brightness is measured by each pixel in the full-color test picture outputted by the display device, and then according to the measured The luminance value of each pixel obtains a reference luminance value, and a compensation coefficient for each pixel is obtained according to the reference luminance value and the luminance value of each pixel, and the signal input to each pixel is separately compensated and corrected according to the compensation coefficient.
  • the reference brightness obtains a compensation coefficient, and the brightness compensation of each pixel is corrected to the reference brightness by the compensation coefficient, which can effectively improve the display effect of the display device, and greatly improve the display effect of the display device.
  • the display compensation method according to an embodiment of the present invention can be applied to various known display devices.
  • the TFT switching circuit fabricated on the large-area glass substrate often appears on electrical parameters such as threshold voltage and mobility. Uniformity, thus making the threshold voltage of each TFT
  • the offsets are inconsistent, which will cause the current difference and brightness difference of the 0LED display device to be perceived by the human eye, resulting in a problem of uneven display effect between pixels.
  • the display compensation method provided by the embodiment of the present invention is particularly effective for improving the above problems.
  • the full-color luminance test is performed on the completed AMOLED display device, and after confirming the brightness of the all-white test screen, the brightness of each pixel is measured.
  • the white picture is the sum of the brightness of the three colors of RGB, in order to improve the accuracy, it is usually possible to separately test the RGB full-color picture.
  • a compensation coefficient for each pixel is obtained based on the reference luminance value and the luminance value of each pixel.
  • a compensation coefficient larger than 1 can be multiplied on a pixel smaller than the average value, and a compensation coefficient smaller than 1 is multiplied by a pixel larger than the average value, thereby exhibiting a ratio. More uniform brightness characteristics before compensation.
  • the compensation coefficient of each pixel may be a ratio of the brightness of the pixel to the reference brightness value (average value). When the brightness of the pixel is less than the average value, it may be multiplied by a compensation coefficient larger than 1; When the brightness is greater than the average value, it can be multiplied by a compensation factor smaller than 1, to adjust the brightness value of the pixel to an average value.
  • the voltage or current input to the pixel is further adjusted according to the compensation coefficient, thereby realizing compensation correction.
  • the compensation coefficient thus obtained can be saved to the non-volatile memory.
  • the input signal of the pixel multiplied by the value of the compensation coefficient is changed to the input of the driving IC, thereby obtaining a new brightness.
  • the compensation coefficient is applied to the entire gray scale, all gray scales such as high gray scale, low gray scale, medium gray scale, and the like can be applied. However, because of the possibility of signal loss during data processing. Therefore, under low gray scale and medium gray scale, there is a possibility of underflow; in high gray scale there is a possibility of overflow.
  • LSB least significant bit
  • the display compensation method of the embodiment of the present invention by measuring the brightness of each pixel in the full-color test picture outputted by the display device, the brightness unevenness between pixels in actual use can be clearly understood, and thus The actual brightness of one pixel and the reference brightness are compensated coefficients, and the brightness compensation of each pixel is corrected to the reference brightness by the compensation coefficient, which can effectively improve the display effect of the display device, and greatly improve the display of the display device. effect.
  • FIG. 3 is a schematic structural diagram of a display compensation apparatus according to an embodiment of the present invention.
  • the display compensation device includes: a measuring unit 31, a calculating unit 32, a processing unit 33, and a compensation unit 34.
  • the measuring unit 31 is configured to perform luminance measurement for each pixel in the full-color test picture output from the display device when the display device in the uncompensated state outputs the full-color test picture.
  • the calculation unit 32 is configured to obtain a reference luminance value based on the measured luminance value of each pixel.
  • the processing unit 33 is configured to obtain a compensation coefficient for each pixel based on the reference luminance value and the luminance value of each pixel.
  • the compensation unit 34 is configured to separately compensate for the signal input to each pixel based on the compensation coefficient.
  • a display compensation device when the display device in the uncompensated state outputs a full-color test screen, the brightness is measured by each pixel in the full-color test picture outputted from the display device, and then according to each measured The luminance value of one pixel obtains a reference luminance value, and a compensation coefficient for each pixel is obtained according to the reference luminance value and the luminance value of each pixel, and the signal input to each pixel is separately compensated and corrected according to the compensation coefficient.
  • the reference brightness obtains a compensation coefficient, and the brightness compensation of each pixel is corrected to the reference brightness by the compensation coefficient, which can effectively improve the display effect of the display device, and greatly improve the display effect of the display device.
  • the uncompensated state of the display device may specifically include an initial state when the display device is powered on for the first time, or may be an artificially set one for compensating brightness according to actual needs of the user during use of the display device. Test status.
  • the embodiment of the present invention mainly uses the full-color test screen to examine the brightness of each pixel. It is conceivable that, in an ideal case, the brightness of the full-color test picture output by each pixel of the display device should be the same, and the same brightness value is the reference brightness value, since the brightness value and the reference of each pixel The brightness values are the same, so there is no need to compensate for the signal of the input pixel.
  • the full color test screen may specifically include an all white test screen, or the full color test screen may further include a full red test screen, a full green test screen, and a full blue test screen.
  • the measuring unit 31 may be further configured to perform luminance measurement of a red R value, a green G value, and a blue B value for each pixel in the full color test picture output by the display device.
  • the white light is usually composed of three colors of red, green and blue (RGB) in a certain proportion
  • RGB red, green and blue
  • the corresponding measurement instrument can be used to perform RGB on the full red test screen, the full green test screen, and the full blue test screen. Brightness measurement, which allows accurate compensation of color brightness differences.
  • the calculating unit 32 may be further configured to obtain the reference R value brightness, the reference G value brightness, and the reference B value brightness according to the measured R value, G value, and B value brightness of each pixel, respectively.
  • a value may be selected as the reference brightness value within the range of the values, and the brightness of the pixel is adjusted according to the reference brightness value, thereby realizing display of each pixel of the display device. Uniform brightness.
  • the calculating unit 32 may specifically include: a mean calculating module 321, a probability calculating module 322 or a most value calculating module.
  • the mean value calculation module 321 may be configured to calculate a brightness average value of all pixels based on the measured brightness value of each pixel, and use the brightness average value as a reference brightness value.
  • the method of obtaining the average value of the brightness of each pixel is usually simple, and the circuit structure for realizing the calculation process is relatively simple.
  • the difference in brightness of each pixel generally satisfies a random distribution, and the average brightness value is used as a reference value.
  • it is also closer to the current brightness setting of the display device, so that the number of pixels to be compensated can be reduced as little as possible, and the efficiency of display compensation can be improved.
  • the probability calculation module 322 can be configured to calculate a brightness value having the highest probability of occurrence based on the measured brightness value of each pixel, and using the maximum probability brightness value as the reference brightness value.
  • Such a reference brightness value calculation method can avoid compensating the brightness of the pixel having the brightness by using the brightness value with the highest probability of occurrence as the reference brightness value, especially when only a small portion of the display device is uneven in brightness. ⁇ Using such a reference brightness value selection method can change the efficiency of display compensation to the greatest extent without changing most pixels with uniform brightness.
  • the maximum value calculation module 323 may be configured to compare the luminance value of each of the pixels measured to obtain a luminance maximum value or a luminance minimum value, and use the luminance maximum value or the luminance minimum value as a reference luminance value.
  • the reference brightness value can be obtained simply and quickly, and the circuit structure is simple, but the disadvantage is that, as a fast selection mode, other pixels except the most value point are excluded. The compensation of the brightness is required, which greatly reduces the efficiency of display compensation.
  • the method for selecting the above three reference brightness values is merely an example. It should be noted that the user can also select other various known reference value selection methods according to the actual needs of the user, which is not limited by the embodiment of the present invention.
  • the level of the input signal when there is a difference between the brightness of a pixel and the reference brightness, the level of the input signal may be correspondingly changed by multiplying the level of the input signal by the compensation coefficient to correct the pixel.
  • the brightness, the acquisition of the compensation coefficient can be used in various ways, and the present invention is not limited thereto.
  • the processing unit 33 further includes: an RGB processing module 331.
  • the RGB processing module 331 is configured to divide the reference R value luminance by the R value luminance of each pixel, divide the reference G value luminance by the G value luminance of each pixel, and divide the reference B value luminance by each pixel, respectively.
  • the B-value luminance is obtained by obtaining an R component compensation coefficient, a G component compensation coefficient, and a B component compensation coefficient for each pixel, respectively.
  • the measurement device performs RGB three-color luminance measurement on each pixel in the display device, and assumes that the measured quantization value of the luminance of the pixel is respectively R value brightness 80, G value brightness 100, B value brightness 80, brightness ratio of three color light in white light Not the same.
  • the luminance of the reference R value calculated based on the luminance values of all the pixels is 100
  • the luminance of the reference G value is 100
  • the luminance of the reference B value is 70. This indicates that the luminance of the pixel is too low due to the R value, and the luminance of the B value is too high. This causes uneven display brightness, while the G value brightness does not need to be adjusted.
  • the R component compensation coefficient is 1.25
  • the G component compensation coefficient is 1
  • the B component compensation coefficient is 0.875 for the pixel, so that the compensation coefficient can be multiplied by the RGB signal input to the pixel, respectively.
  • the display brightness of the pixel and the reference value is made uniform.
  • the display compensation device further includes: a storage unit 35 configured to store the compensation coefficient in the non-volatile memory for each pixel when the display device is turned on or reset The signal is compensated for correction.
  • the non-volatile memory may specifically be various known non-volatile storage hardware including a hard disk.
  • the obtained compensation coefficient does not disappear due to the power failure of the storage medium, and is stored in the nonvolatile state when the user reopens the display device or the display device completes the reset operation.
  • the compensation coefficient of each pixel in the memory will be directly multiplied by the RGB pixel signal to achieve a compensated output of the pixel luminance.
  • a pixel may also have a change in brightness due to external light irradiation or a slight difference in driving current or a reasonable change in voltage, and the brightness change usually has a small variation range.
  • the change time is short, and if the change happens to occur during the measurement phase in which the display compensation is performed, unnecessary compensation will occur, which is also disadvantageous for achieving uniformity of display of the display device.
  • the absolute value of the difference between the measured brightness value of each pixel and the reference brightness value is within a preset value range, wherein the preset The value range can be set arbitrarily according to the actual situation. Specifically, if the absolute value of the difference is within a preset value range, determining that the pixel is a reasonable random change point does not need to perform display compensation; if the absolute value of the difference is not within a preset value range, determining the The pixel is a dead pixel, and the signal input to the pixel is compensated and corrected according to the compensation coefficient of the pixel.
  • the above method for determining the dead pixel is only an example. The user can also select other known dead point determination methods according to actual conditions, and the embodiments of the present invention are not listed here.
  • the display compensation device of the embodiment of the present invention by measuring the brightness of each pixel in the full-color test picture outputted by the display device, it is possible to clearly understand the brightness between pixels in actual use.
  • the degree of non-uniformity can be obtained according to the actual brightness of each pixel and the reference brightness, and the brightness compensation of each pixel is corrected to the reference brightness by the compensation coefficient, thereby effectively improving the display effect of the display device.
  • the problem is that the display effect of the display device is greatly improved.
  • FIG. 5 is a schematic structural diagram of a display compensation system according to an embodiment of the present invention. As shown in FIG. 5, the display compensation system includes: a display device 51 and a display compensation device 52 as described above.
  • the display compensation device may be configured to: when the display device in the uncompensated state outputs a full color test screen, perform brightness measurement on each pixel in the full color test screen output by the display device; according to each pixel measured The brightness value obtains a reference brightness value; a compensation coefficient for each pixel is obtained according to the reference brightness value and the brightness value of each pixel; and the signal input to each pixel is separately compensated and corrected according to the compensation coefficient.
  • a display compensation system when a display device in an uncompensated state outputs a full-color test screen, brightness is measured by each pixel in the full-color test picture outputted from the display device, and then according to each measured The luminance value of one pixel obtains a reference luminance value, and a compensation coefficient for each pixel is obtained according to the reference luminance value and the luminance value of each pixel, and the signal input to each pixel is separately compensated and corrected according to the compensation coefficient.
  • the reference brightness obtains a compensation coefficient, and the brightness compensation of each pixel is corrected to the reference brightness by the compensation coefficient, which can effectively improve the display effect of the display device, and greatly improve the display effect of the display device.
  • the display device can use various known display devices including a TFT-LCD, a PMOLED, or an AMOLED, and the embodiment of the present invention is not limited thereto.
  • the detailed configuration of the display compensating device has been described in the foregoing embodiment and will not be described here.

Abstract

一种显示补偿方法、装置及显示补偿系统,涉及显示技术领域。所述显示补偿方法包括:当处于未补偿状态的显示装置输出全色测试画面时,对所述显示装置输出的全色测试画面中的每一个像素进行亮度测量;根据测量到的所述每一个像素的亮度值得到基准亮度值;根据所述基准亮度值与所述每一个像素的亮度值得到所述每一个像素的补偿系数;根据所述补偿系数分别对输入所述每一个像素的信号进行补偿修正。采用该方法可以有效改善显示装置的显示效果不均一的问题。

Description

显示补偿方法、 装置及显示补偿系统 技术领域
本发明涉及一种显示补偿方法、 装置及显示补偿系统。 背景技术
随着显示技术的不断发展, 越来越多的人们开始将注意力投向具有更优 显示性能的有机发光二极管 (Organic Light Emitting Diode, OLED )显示器 件。 OLED显示器件作为一种电流型发光器件, 因其所具有的自发光、 快速 响应、 宽视角和可制作在柔性衬底上等特点而越来越多地被应用于高性能显 示领域当中。 OLED 按驱动方式可分为 PMOLED(Passive Matrix Driving OLED, 无源矩阵驱动有机发光二极管)和 AMOLED ( Active Matrix Driving OLED, 有源矩阵驱动有机发光二极管) 两种。 传统的 PMOLED随着显示装 置尺寸的增大, 通常需要降低单个像素的驱动时间, 因而需要增大瞬态电流, 从而导致功耗的大幅上升。 而在 AMOLED技术中, 每个 OLED均通过 TFT (Thin Film Transistor, 薄膜晶体管)开关电路逐行扫描输入电流, 可以很好地 解决这些问题。
在现有的 AMOLED面板中, TFT开关电路多釆用低温多晶硅薄膜晶体 管 (LTPS TFT)或氧化物薄膜晶体管( Oxide TFT )。 与一般的非晶硅薄膜晶体 管 ( amorphous-Si TFT )相比, LTPS TFT和 Oxide TFT具有更高的迁移率和 更稳定的特性, 更适合应用于 AMOLED显示中。 但是由于晶化工艺和制作 水平的限制, 导致在大面积玻璃基板上制作的 TFT开关电路常常在诸如阔值 电压、 迁移率等电学参数上出现非均匀性, 从而使得各个 TFT的阔值电压偏 移不一致, 这将导致 OLED显示器件的电流差异和亮度差异, 并被人眼所感 知, 从而在像素之间产生显示效果不均一的问题。 即使在全部像素上施加了 同一个灰阶的灰阶电压, 也会因为各个像素之间的不均一性, 产生像素之间 的亮度不均一问题, 从而导致显示品质下降, 严重影响了用户的使用感受。 发明内容
为了解决上述问题, 本发明的实施例提供了一种显示补偿方法、 装置及 显示补偿系统, 可以有效改善显示装置的显示效果不均一的问题。 根据本发明一方面, 提供了一种显示补偿方法, 包括: 当处于未补偿状 态的显示装置输出全色测试画面时, 对所述显示装置输出的全色测试画面中 的每一个像素进行亮度测量; 根据测量到的所述每一个像素的亮度值得到基 准亮度值; 根据所述基准亮度值与所述每一个像素的亮度值得到所述每一个 像素的补偿系数; 根据所述补偿系数分别对输入所述每一个像素的信号进行 补偿修正。
根据本发明另一方面, 提供了一种显示补偿装置, 包括: 测量单元, 被 配置为当处于未补偿状态的显示装置输出全色测试画面时, 对所述显示装置 输出的全色测试画面中的每一个像素进行亮度测量; 计算单元, 被配置为根 据测量到的所述每一个像素的亮度值得到基准亮度值; 处理单元, 被配置为 根据所述基准亮度值与所述每一个像素的亮度值得到所述每一个像素的补偿 系数; 以及补偿单元, 被配置为根据所述补偿系数分别对输入所述每一个像 素的信号进行补偿修正。
根据本发明又一方面, 提供了一种显示补偿系统, 包括: 显示装置以及 如上所述的显示补偿装置。
釆用这样一种显示补偿方法、 装置及显示补偿系统, 当处于未补偿状态 的显示装置输出全色测试画面时, 通过对该显示装置输出的全色测试画面中 的每一个像素进行亮度测量, 再根据测量到的每一个像素的亮度值得到基准 亮度值, 根据该基准亮度值与每一个像素的亮度值得到每一个像素的补偿系 数, 进一步根据该补偿系数分别对输入每一个像素的信号进行补偿修正。 这 样一来, 通过测量显示装置输出的全色测试画面中的每一个像素的亮度, 可 以清楚的了解到实际使用中各像素之间的亮度不均一情况, 从而可以根据每 一个像素的实际亮度与基准亮度得到补偿系数, 通过该补偿系数将每一个像 素的亮度补偿修正至该基准亮度, 这样可以有效改善显示装置的显示效果不 均一的问题, 大大提升了显示装置的显示效果。 附图说明
图 1为本发明实施例提供的一种显示补偿方法的流程示意图
图 2为本发明实施例提供的另一显示补偿方法的流程示意图
图 3为本发明实施例提供的一种显示补偿装置的结构示意图
图 4为本发明实施例提供的另一显示补偿装置的结构示意图; 图 5为本发明实施例提供的一种显示补偿系统的结构示意图。 具体实施方式
下面将结合本发明实施例中的附图, 对本发明实施例中的技术方案进行 清楚、 完整地描述, 显然, 所描述的实施例仅仅是本发明一部分实施例, 而 不是全部的实施例。 基于本发明中的实施例, 本领域普通技术人员所获得的 所有其他实施例, 都属于本发明保护的范围。
图 1示出了本发明实施例提供的显示补偿方法。
在步骤 S101, 当处于未补偿状态的显示装置输出全色测试画面时, 对该 显示装置输出的全色测试画面中的每一个像素进行亮度测量。
在步骤 S102, 根据测量到的每一个像素的亮度值得到基准亮度值。
具体的, 在得到每一个像素的关于亮度的量化数值之后, 可以在这些数 值的范围内根据预设的公式或人工地选定一个数值作为基准亮度值, 根据该 基准亮度值调整每一个像素的亮度, 从而实现显示装置每一个像素显示亮度 的均一化。 例如, 可以根据测量到的每一个像素的亮度值得到平均值, 将该 平均值作为基准亮度值。
在步骤 S103,根据该基准亮度值与每一个像素的亮度值得到每一个像素 的补偿系数。
在步骤 S104,根据该补偿系数分别对输入每一个像素的信号进行补偿修 正。
具体的, 每一个像素的补偿系数可以是该像素的亮度与基准亮度值之间 的数值关系,根据该数值关系进一步调整该像素的输入信号(如电压或电流 ), 从而实现补偿修正; 或者, 每一个像素的补偿系数还可以是该像素的输入信 号与基准亮度值所对应的标准输入信号之间的数值关系, 根据该数值关系可 以直接指导该像素输入信号的补偿修正。
釆用这样一种显示补偿方法, 当处于未补偿状态的显示装置输出全色测 试画面时, 通过对该显示装置输出的全色测试画面中的每一个像素进行亮度 测量, 再根据测量到的每一个像素的亮度值得到基准亮度值, 根据该基准亮 度值与每一个像素的亮度值得到每一个像素的补偿系数, 进一步根据该补偿 系数分别对输入每一个像素的信号进行补偿修正。 这样一来, 通过测量显示 装置输出的全色测试画面中的每一个像素的亮度, 可以清楚的了解到实际使 用中各像素之间的亮度不均一情况, 从而可以根据每一个像素的实际亮度与 基准亮度得到补偿系数, 通过该补偿系数将每一个像素的亮度补偿修正至该 基准亮度, 这样可以有效改善显示装置的显示效果不均一的问题, 大大提升 了显示装置的显示效果。
显示装置的未补偿状态具体可以包括该显示装置第一次上电使用时的初 始状态, 或者还可以是在该显示装置的使用过程中根据用户的实际需要人为 设置的一种用于补偿亮度的测试状态。 为了直观准确地获取到该显示装置中 每一个像素的亮度差异情况, 本发明实施例主要釆用全色测试画面考察每一 个像素的亮度。 可以想到, 一种理想的情况下, 在进行一帧全色画面显示时, 显示装置的每一个像素所输出的全色测试画面的亮度应当是相同的, 该相同 的亮度值即为基准亮度值, 由于每一个像素的亮度值与基准亮度值均相同, 因此无需对输入像素的信号进行补偿修正。
在本发明实施例中, 全色测试画面具体是指显示装置全部像素均显示同 一种颜色的这样一种显示画面。 例如, 全色测试画面具体可以包括全白测试 画面, 或者全色测试画面还可以分别包括全红测试画面、 全绿测试画面以及 全蓝测试画面。 理想情况下, 在全色测试画面中的每一个像素所显示色彩的 亮度应当均与预设的亮度灰阶相等, 其中, 该预设的亮度灰阶可以根据实际 需要自由进行选择, 由于 8bit的灰阶范围通常为 0~255, 其中 0为最暗, 255 为最亮, 为了便于观察, 在本发明实施例中, 可以将全色测试画面的亮度灰 阶优选为 255灰阶进行测试。 本发明实施例提供的显示补偿方法可以如图 2 所示。根据本发明实施例, 图 1中的步骤 S101可以具体地通过图 2中的步骤 S201实现, 也就是说, 对显示装置输出的全色测试画面中的每一个像素进行 亮度测量具体可以为: 在步骤 S201, 对显示装置输出的全色测试画面中的每 一个像素分别进行红色 R值、 绿色 G值以及蓝色 B值的亮度测量。
具体的, 由于白光通常是由红绿蓝 (RGB )三种颜色的光线按照一定比 例组成, 当釆用全白测试画面测试像素的亮度时, 可以仅对每一个像素的白 光亮度进行测量,或者还可以釆用相应的测量仪器分别对白光中的 RGB分量 亮度进行测量。 此外, 当全色测试画面釆用全红测试画面、 全绿测试画面以 及全蓝测试画面时, 其中, 全红测试画面、 全绿测试画面以及全蓝测试画面 均可以釆用亮度为 255的灰阶, 可以釆用相应的测量仪器分别对全红测试画 面、 全绿测试画面以及全蓝测试画面进行 RGB亮度测量, 这样一来, 可以对 颜色亮度差异进行准确补偿。
进一步地, 根据本发明实施例, 图 1中的步骤 S102可以具体地通过图 2 中的步骤 S202实现。 在步骤 S202, 根据测量到的每一个像素的 R值、 G值 以及 B值的亮度分别得到基准 R值亮度、 基准 G值亮度以及基准 B值亮度。
具体的, 在得到每一个像素的关于亮度的量化数值之后, 可以在这些数 值的范围内选定一个数值作为基准亮度值, 根据该基准亮度值调整像素的亮 度, 从而实现显示装置每一个像素显示亮度的均一化。
需要说明的是,用户可以根据实际需要,釆用多种方法选取基准亮度值, 本发明对此并不做限制。 在本发明的所有实施例中, 选取基准亮度值的方式 主要釆用如下三种方式。
例如, 可以根据测量到的每一个像素的亮度值计算得到全部像素的亮度 平均值, 将该亮度平均值作为基准亮度值。
通过对每一个像素的亮度值求取亮度平均值的方法通常较为简单, 实现 这一计算过程的电路结构也较为简单。 此外, 在显示装置的实际应用的过程 中, 每一个像素的亮度差异通常满足随机分布, 釆用平均亮度值作为基准值 通常也较为接近显示装置当前的亮度设置, 从而能够尽量少的降低需要补偿 的像素的个数, 提高显示补偿的效率。
替代地, 还可以根据测量到的每一个像素的亮度值计算得到出现概率最 大的亮度值, 将最大概率亮度值作为基准亮度值。
这样一种基准亮度值计算方法, 通过将出现概率最大的亮度值作为基准 亮度值, 可以避免对具有这一亮度的像素亮度进行补偿, 尤其是当显示装置 仅有一小部分发生亮度不均一现象时, 釆用这样一种基准亮度值选取方法可 以无需对大部分亮度均一的像素进行改变, 从而最大限度的提高了进行显示 补偿的效率。
替代地, 还可以根据测量到的每一个像素的亮度值比较得到亮度最大值 或亮度最小值, 将该亮度最大值或亮度最小值作为基准亮度值。
釆用这样一种基准亮度值计算方法, 可以简单快速的得到基准亮度值且 实现电路结构简单, 但其不足之处在于, 作为一种快速选取的模式, 除过最 值点外的其他像素点均需要进行亮度的补偿, 很大程度上降低了显示补偿的 效率。
当然, 以上三种基准亮度值的选取方法也仅仅是举例说明, 应当想到, 用户同样可以根据自身的实际需要选取其他各种已知的基准值选取方法, 本 发明实施例对此并不作限制。
在分别得到基准 R值亮度、基准 G值亮度以及基准 B值亮度之后,本发 明实施例提供的显示补偿方法进行到步骤 S203。在步骤 S203,根据该基准亮 度值与每一个像素的亮度值得到每一个像素的补偿系数。
具体的, 在本发明实施例中, 当一个像素的亮度与基准亮度之间存在差 异时, 可以通过将输入信号的电平乘以补偿系数来相应的改变输入信号的电 平大小以便修正像素的亮度, 该补偿系数的获取可以釆用多种方式, 本发明 对此并不做限制。
例如,在分别得到基准 R值亮度、基准 G值亮度以及基准 B值亮度之后, 可以将基准 R值亮度分别除以每一个像素的 R值亮度、将基准 G值亮度分别 除以每一个像素的 G值亮度、将基准 B值亮度分别除以每一个像素的 B值亮 度, 从而可以分别得到每一个像素的 R分量补偿系数、 G分量补偿系数以及 B分量补偿系数。
以显示装置输出全白测试画面为例, 釆用测量设备对显示装置中的每一 个像素分别进行 RGB三色的亮度测量,假设测量到的该像素的亮度的量化值 分别为 R值亮度 80、 G值亮度 100、 B值亮度 80, 白光中三色光的亮度占比 并不相同。 而假设根据全部像素的亮度值计算得到的基准 R值亮度为 100、 基准 G值亮度为 100、 基准 B值亮度为 70, 由此可知, 该像素由于 R值亮度 过低、 B值亮度过高造成显示亮度的不均一, 而 G值亮度则无需调整。 通过 计算可以得到对于该像素而言 R分量补偿系数为 1.25、 G分量补偿系数为 1、 B分量补偿系数为 0.875, 这样一来, 可以将上述补偿系数分别与输入该像素 的 RGB信号相乘, 实现该像素点与基准值的显示亮度均一化。
进一步地, 如图 2所示, 在得到补偿系数之后, 本发明实施例提供的显 示补偿方法进行到步骤 S203。在步骤 S204,将补偿系数存储在非易失性存储 器中, 以便在显示装置开启或复位时对每一个像素的信号进行补偿修正。
非易失性存储器( non-volatile memory )具体可以为包括硬盘在内的各种 已知的非易失性存储硬件。 这样一来, 当用户对显示装置进行关机或复位操 作时, 已得到的补偿系数不会因存储介质断电而消失, 当用户重新打开显示 装置或显示装置完成复位操作时, 存储在非易失性存储器中的每一个像素的 补偿系数将直接乘上 RGB像素信号, 实现像素亮度的补偿输出。 具体地, 在步骤 S205, 根据该补偿系数分别对输入每一个像素的信号进 行补偿修正。
在显示装置实际应用的过程中, 一个像素也有可能会因为外界光线的照 射或是因为驱动电流或电压的合理变化等细微差别而产生亮度的变化, 该亮 度变化通常变化范围较小、 变化时间较短, 若该变化恰好发生在进行显示补 偿的测量阶段将导致出现不必要的补偿, 这同样不利于实现显示装置显示的 均一化。 为了避免合理的随机变化对显示补偿的影响, 可以通过设置数值或 时间的阔值, 最大限度的排除由于随机干扰而产生亮度变化的良好像素点, 找出亮度不均一的坏点。
例如, 在得到每一个像素的补偿系数之后, 可以进一步判断测量到的每 一个像素的亮度值与基准亮度值之间差的绝对值是否在预设的数值范围之 内, 其中, 该预设的数值范围可以根据实际情况任意进行设置。 具体的, 若 差的绝对值在预设的数值范围之内, 则判定该像素为合理的随机变化点, 无 需进行显示补偿; 若差的绝对值不在预设的数值范围之内, 则判定该像素为 坏点, 进而根据该像素的补偿系数分别对输入该像素的信号进行补偿修正。 当然, 以上判定坏点的方法也仅是举例说明, 用户还可以根据实际情况选择 其他已知的坏点判定方法, 本发明实施例在此不——列举。
根据本发明实施例的显示补偿方法, 当处于未补偿状态的显示装置输出 全色测试画面时, 通过对该显示装置输出的全色测试画面中的每一个像素进 行亮度测量, 再根据测量到的每一个像素的亮度值得到基准亮度值, 根据该 基准亮度值与每一个像素的亮度值得到每一个像素的补偿系数, 进一步根据 该补偿系数分别对输入每一个像素的信号进行补偿修正。 这样一来, 通过测 量显示装置输出的全色测试画面中的每一个像素的亮度, 可以清楚的了解到 实际使用中各像素之间的亮度不均一情况, 从而可以根据每一个像素的实际 亮度与基准亮度得到补偿系数, 通过该补偿系数将每一个像素的亮度补偿修 正至该基准亮度, 这样可以有效改善显示装置的显示效果不均一的问题, 大 大提升了显示装置的显示效果。
根据本发明实施例的显示补偿方法可以适用于各种已知的显示装置。 尤 其是对于 AMOLED显示装置而言,由于 AMOLED显示装置的晶化工艺和制 作水平的限制, 导致在大面积玻璃基板上制作的 TFT开关电路常常在诸如阔 值电压、 迁移率等电学参数上出现非均匀性, 从而使得各个 TFT的阔值电压 偏移不一致, 这将导致 0LED显示器件的电流差异和亮度差异, 并被人眼所 感知, 从而在像素之间产生显示效果不均一的问题。 即使在全部像素上施加 了同一个灰阶的输入电压, 也会因为各个像素之间的不均一性, 产生像素之 间的亮度不均一问题。 本发明实施例提供的显示补偿方法对于上述问题的改 善尤为明显。
首先, 对于制作完成的 AMOLED显示装置进行全色亮度测试, 在确认 全白测试画面的亮度后, 测定有关每一个像素的亮度。 白色画面虽然是 RGB 三色的亮度的和,但是为了提高其准确性, 通常还可以釆用分别测试 RGB全 彩画面的方法。
在测定完每一个像素的亮度之后, 再求出平均值, 以该平均值作为基准 亮度值。
根据该基准亮度值与每一个像素的亮度值得到每一个像素的补偿系数。 为了将每一个像素补偿至接近平均值, 可以在比平均值小的像素上乘以 一个比 1大的补偿系数,在比平均值大的像素上乘以一个比 1小的补偿系数, 从而显现出比起补偿前更加统一的亮度特性。
例如, 每一个像素的补偿系数可以是该像素的亮度与基准亮度值(平均 值) 的比值, 当该像素的亮度小于平均值时, 可以乘以一个比 1 大的补偿系 数; 当该像素的亮度大于平均值时, 可以乘以一个比 1 小的补偿系数, 以使 该像素的亮度值调整为平均值。 根据该补偿系数进一步调整输入该像素的电 压或电流, 从而实现补偿爹正。
这样求出的补偿系数可以保存到非易失性存储器上,在启动或者复位时, 像素的输入信号乘上该补偿系数的值变更为驱动 IC的输入,从而得出了新的 亮度。
因为该补偿系数适用于整个灰阶, 所以对于高灰阶, 低灰阶, 中灰阶等 全部灰阶都可以适用。 但是因为在数据处理( Data processing )的过程中, 存 在发生信号损失的可能性。 因此在低灰阶、 中灰阶情况下会有产生下溢 ( underflow ) 的可能; 在高灰阶会有产生上溢(overflow ) 的可能。
但是在本发明中, 产生上溢时, 无法处理比输入灰阶还要高的灰阶, 因 此处理时可以忽略不计。
为了提高准确率,在进行数据处理的过程中,可以分配比输入 bit数更多 的最低有效位 ( LSB ) bit再进行计算, 之后把 LSB bit删除使用, 从而可以 有效改善数据的下溢。
根据本发明实施例的显示补偿方法, 通过测量显示装置输出的全色测试 画面中的每一个像素的亮度, 可以清楚的了解到实际使用中各像素之间的亮 度不均一情况, 从而可以根据每一个像素的实际亮度与基准亮度得到补偿系 数, 通过该补偿系数将每一个像素的亮度补偿修正至该基准亮度, 这样可以 有效改善显示装置的显示效果不均一的问题, 大大提升了显示装置的显示效 果。
图 3示出了本发明实施例提供的显示补偿装置的结构示意图。 如图 3所 示, 所述显示补偿装置包括: 测量单元 31、 计算单元 32、 处理单元 33以及 补偿单元 34。
测量单元 31 被配置为当处于未补偿状态的显示装置输出全色测试画面 时, 对该显示装置输出的全色测试画面中的每一个像素进行亮度测量。
计算单元 32 被配置为根据测量到的每一个像素的亮度值得到基准亮度 值。
处理单元 33 被配置为根据基准亮度值与每一个像素的亮度值得到每一 个像素的补偿系数。
补偿单元 34 被配置为根据该补偿系数分别对输入每一个像素的信号进 行补偿修正。
釆用这样一种显示补偿装置, 当处于未补偿状态的显示装置输出全色测 试画面时, 通过对该显示装置输出的全色测试画面中的每一个像素进行亮度 测量, 再根据测量到的每一个像素的亮度值得到基准亮度值, 根据该基准亮 度值与每一个像素的亮度值得到每一个像素的补偿系数, 进一步根据该补偿 系数分别对输入每一个像素的信号进行补偿修正。 这样一来, 通过测量显示 装置输出的全色测试画面中的每一个像素的亮度, 可以清楚的了解到实际使 用中各像素之间的亮度不均一情况, 从而可以根据每一个像素的实际亮度与 基准亮度得到补偿系数, 通过该补偿系数将每一个像素的亮度补偿修正至该 基准亮度, 这样可以有效改善显示装置的显示效果不均一的问题, 大大提升 了显示装置的显示效果。
显示装置的未补偿状态具体可以包括该显示装置第一次上电使用时的初 始状态, 或者还可以是在该显示装置的使用过程中根据用户的实际需要人为 设置的一种用于补偿亮度的测试状态。 为了直观准确地获取到该显示装置中 每一个像素的亮度差异情况, 本发明实施例主要釆用全色测试画面考察每一 个像素的亮度。 可以想到, 一种理想的情况下, 显示装置的每一个像素所输 出的全色测试画面的亮度应当是相同的, 该相同的亮度值即为基准亮度值, 由于每一个像素的亮度值与基准亮度值均相同, 因此无需对输入像素的信号 进行补偿修正。
在本发明实施例中, 全色测试画面具体可以包括全白测试画面, 或者全 色测试画面还可以分别包括全红测试画面、全绿测试画面以及全蓝测试画面。
进一步地,测量单元 31还可以被配置为对显示装置输出的全色测试画面 中的每一个像素分别进行红色 R值、 绿色 G值以及蓝色 B值的亮度测量。
具体的, 由于白光通常是由红绿蓝 (RGB )三种颜色的光线按照一定比 例组成, 当釆用全白测试画面测试像素的亮度时, 可以仅对每一个像素的白 光亮度进行测量,或者还可以釆用相应的测量仪器分别对白光中的 RGB分量 亮度进行测量。 此外, 当全色测试画面釆用全红测试画面、 全绿测试画面以 及全蓝测试画面时, 可以釆用相应的测量仪器分别对全红测试画面、 全绿测 试画面以及全蓝测试画面进行 RGB亮度测量, 这样一来, 可以对颜色亮度差 异进行准确补偿。
进一步地, 计算单元 32还可以被配置为根据测量到的每一个像素的 R 值、 G值以及 B值的亮度分别得到基准 R值亮度、 基准 G值亮度以及基准 B 值亮度。
具体的, 在得到每一个像素的关于亮度的量化数值之后, 可以在这些数 值的范围内选定一个数值作为基准亮度值, 根据该基准亮度值调整像素的亮 度, 从而实现显示装置每一个像素显示亮度的均一化。
需要说明的是,用户可以根据实际需要,釆用多种方法选取基准亮度值, 本发明对此并不做限制。 在本发明的所有实施例中, 如图 4所示, 计算单元 32具体可以包括: 均值计算模块 321、 概率计算模块 322或者最值计算模块
323。
均值计算模块 321可以被配置为根据测量到的每一个像素的亮度值计算 得到全部像素的亮度平均值, 将该亮度平均值作为基准亮度值。
通过对每一个像素的亮度值求取亮度平均值的方法通常较为简单, 实现 这一计算过程的电路结构也较为简单。 此外, 在显示装置的实际应用的过程 中, 每一个像素的亮度差异通常满足随机分布, 釆用平均亮度值作为基准值 通常也较为接近显示装置当前的亮度设置, 从而能够尽量少的降低需要补偿 的像素的个数, 提高显示补偿的效率。
概率计算模块 322可以被配置为根据测量到的每一个像素的亮度值计算 得到出现概率最大的亮度值, 将最大概率亮度值作为基准亮度值。
这样一种基准亮度值计算方法, 通过将出现概率最大的亮度值作为基准 亮度值, 可以避免对具有这一亮度的像素亮度进行补偿, 尤其是当显示装置 仅有一小部分发生亮度不均一现象时, 釆用这样一种基准亮度值选取方法可 以无需对大部分亮度均一的像素进行改变, 从而最大限度的提高了进行显示 补偿的效率。
最值计算模块 323可以被配置为根据测量到的每一个像素的亮度值比较 得到亮度最大值或亮度最小值, 将该亮度最大值或亮度最小值作为基准亮度 值。
釆用这样一种基准亮度值计算方法, 可以简单快速的得到基准亮度值且 实现电路结构简单, 但其不足之处在于, 作为一种快速选取的模式, 除过最 值点外的其他像素点均需要进行亮度的补偿, 很大程度上降低了显示补偿的 效率。
当然, 以上三种基准亮度值的选取方法也仅仅是举例说明, 应当想到, 用户同样可以根据自身的实际需要选取其他各种已知的基准值选取方法, 本 发明实施例对此并不作限制。
具体的, 在本发明实施例中, 当一个像素的亮度与基准亮度之间存在差 异时, 可以通过将输入信号的电平乘以补偿系数来相应的改变输入信号的电 平大小以便修正像素的亮度, 该补偿系数的获取可以釆用多种方式, 本发明 对此并不做限制。
进一步地, 如图 4所示, 处理单元 33还包括: RGB处理模块 331。 RGB处理模块 331被配置为将基准 R值亮度分别除以每一个像素的 R 值亮度、将基准 G值亮度分别除以每一个像素的 G值亮度、将基准 B值亮度 分别除以每一个像素的 B值亮度, 分别得到每一个像素的 R分量补偿系数、 G分量补偿系数以及 B分量补偿系数。
以显示装置输出全白测试画面为例, 釆用测量设备对显示装置中的每一 个像素分别进行 RGB三色的亮度测量,假设测量到的该像素的亮度的量化值 分别为 R值亮度 80、 G值亮度 100、 B值亮度 80, 白光中三色光的亮度占比 并不相同。 而假设根据全部像素的亮度值计算得到的基准 R值亮度为 100、 基准 G值亮度为 100、 基准 B值亮度为 70, 由此可知, 该像素由于 R值亮度 过低、 B值亮度过高造成显示亮度的不均一, 而 G值亮度则无需调整。 通过 计算可以得到对于该像素而言 R分量补偿系数为 1.25、 G分量补偿系数为 1、 B分量补偿系数为 0.875, 这样一来, 可以将上述补偿系数分别与输入该像素 的 RGB信号相乘, 实现该像素点与基准值的显示亮度均一化。
进一步地, 如图 4所示, 显示补偿装置还包括: 存储单元 35, 其被配置 为将补偿系数存储在非易失性存储器中, 以便在所述显示装置开启或复位时 对每一个像素的信号进行补偿修正。
非易失性存储器( non-volatile memory )具体可以为包括硬盘在内的各种 已知的非易失性存储硬件。 这样一来, 当用户对显示装置进行关机或复位操 作时, 已得到的补偿系数不会因存储介质断电而消失, 当用户重新打开显示 装置或显示装置完成复位操作时, 存储在非易失性存储器中的每一个像素的 补偿系数将直接乘上 RGB像素信号, 实现像素亮度的补偿输出。
进一步地, 在显示装置实际应用的过程中, 一个像素也有可能会因为外 界光线的照射或是因为驱动电流或电压的合理变化等细微差别而产生亮度的 变化, 该亮度变化通常变化范围较小、 变化时间较短, 若该变化恰好发生在 进行显示补偿的测量阶段将导致出现不必要的补偿, 这同样不利于实现显示 装置显示的均一化。 为了避免合理的随机变化对显示补偿的影响, 可以通过 设置数值或时间的阔值, 最大限度的排除由于随机干扰而产生亮度变化的良 好像素点, 找出亮度不均一的坏点。
例如, 在得到每一个像素的补偿系数之后, 可以进一步判断测量到的每 一个像素的亮度值与基准亮度值之间差的绝对值是否在预设的数值范围之 内, 其中, 该预设的数值范围可以根据实际情况任意进行设置。 具体的, 若 差的绝对值在预设的数值范围之内, 则判定该像素为合理的随机变化点, 无 需进行显示补偿; 若差的绝对值不在预设的数值范围之内, 则判定该像素为 坏点, 进而根据该像素的补偿系数分别对输入该像素的信号进行补偿修正。 当然, 以上判定坏点的方法也仅是举例说明, 用户还可以根据实际情况选择 其他已知的坏点判定方法, 本发明实施例在此不——列举。
才艮据本发明实施例的显示补偿装置, 通过测量显示装置输出的全色测试 画面中的每一个像素的亮度, 可以清楚的了解到实际使用中各像素之间的亮 度不均一情况, 从而可以根据每一个像素的实际亮度与基准亮度得到补偿系 数, 通过该补偿系数将每一个像素的亮度补偿修正至该基准亮度, 这样可以 有效改善显示装置的显示效果不均一的问题, 大大提升了显示装置的显示效 果。
图 5示出了本发明实施例提供的显示补偿系统的结构示意图。 如图 5所 示, 所述显示补偿系统包括: 显示装置 51以及如上任一所述的显示补偿装置 52。
该显示补偿装置可以被配置为: 当处于未补偿状态的显示装置输出全色 测试画面时, 对该显示装置输出的全色测试画面中的每一个像素进行亮度测 量; 根据测量到的每一个像素的亮度值得到基准亮度值; 根据该基准亮度值 与每一个像素的亮度值得到每一个像素的补偿系数; 根据该补偿系数分别对 输入每一个像素的信号进行补偿修正。
釆用这样一种显示补偿系统, 当处于未补偿状态的显示装置输出全色测 试画面时, 通过对该显示装置输出的全色测试画面中的每一个像素进行亮度 测量, 再根据测量到的每一个像素的亮度值得到基准亮度值, 根据该基准亮 度值与每一个像素的亮度值得到每一个像素的补偿系数, 进一步根据该补偿 系数分别对输入每一个像素的信号进行补偿修正。 这样一来, 通过测量显示 装置输出的全色测试画面中的每一个像素的亮度, 可以清楚的了解到实际使 用中各像素之间的亮度不均一情况, 从而可以根据每一个像素的实际亮度与 基准亮度得到补偿系数, 通过该补偿系数将每一个像素的亮度补偿修正至该 基准亮度, 这样可以有效改善显示装置的显示效果不均一的问题, 大大提升 了显示装置的显示效果。
具体的, 显示装置可以釆用包括 TFT-LCD、 PMOLED或者 AMOLED在 内的各种已知的显示装置, 本发明实施例再次并不作限制。 显示补偿装置的 详细构造已在前述实施例中备述, 此处不做赞述。
本领域普通技术人员可以理解: 实现上述方法实施例的全部或部分步骤 可以通过程序指令相关的硬件来完成, 前述的程序可以存储于一计算机可读 取存储介质中, 该程序在执行时, 执行包括上述方法实施例的步骤; 而前述 的存储介质包括: OM, RAM, 磁碟或者光盘等各种可以存储程序代码的介 质。
以上所述, 仅为本发明的具体实施方式, 但本发明的保护范围并不局限 于此, 任何熟悉本技术领域的技术人员在本发明揭露的技术范围内, 可轻易 想到变化或替换, 都应涵盖在本发明的保护范围之内。 因此, 本发明的保护 范围应以所述权利要求的保护范围为准。
本申请要求 2013年 9月 30日提交的申请号为 201310461487.9且发明名 称为 "一种显示补偿方法、 装置及显示补偿系统" 的中国优先申请的优先权, 通过引用将其全部内容并入于此。

Claims

权 利 要 求 书
1、 一种显示补偿方法, 包括:
当处于未补偿状态的显示装置输出全色测试画面时, 对所述显示装置输 出的全色测试画面中的每一个像素进行亮度测量;
根据测量到的所述每一个像素的亮度值得到基准亮度值;
根据所述基准亮度值与所述每一个像素的亮度值得到所述每一个像素的 补偿系数;
根据所述补偿系数分别对输入所述每一个像素的信号进行补偿修正。
2、根据权利要求 1所述的显示补偿方法, 其中, 所述全色测试画面包括 全白测试画面, 或者所述全色测试画面分别包括全红测试画面、 全绿测试画 面以及全蓝测试画面; 所述对所述显示装置输出的全色测试画面中的每一个 像素进行亮度测量包括:
对所述显示装置输出的全色测试画面中的每一个像素分别进行红色 R 值、 绿色 G值以及蓝色 B值的亮度测量。
3、根据权利要求 2所述的显示补偿方法, 其中, 所述根据测量到的所述 每一个像素的亮度值得到基准亮度值包括:
根据测量到的所述每一个像素的 R值、 G值以及 B值的亮度分别得到基 准 R值亮度、 基准 G值亮度以及基准 B值亮度。
4、根据权利要求 3所述的显示补偿方法, 其中, 所述根据所述基准亮度 值与所述每一个像素的亮度值得到所述每一个像素的补偿系数包括:
将所述基准 R值亮度分别除以所述每一个像素的 R值亮度、将所述基准 G值亮度分别除以所述每一个像素的 G值亮度、 将所述基准 B值亮度分别除 以所述每一个像素的 B值亮度,分别得到所述每一个像素的 R分量补偿系数、 G分量补偿系数以及 B分量补偿系数。
5、 根据权利要求 1-4任一所述的显示补偿方法, 其中, 所述根据测量到 的所述每一个像素的亮度值得到基准亮度值包括:
根据测量到的所述每一个像素的亮度值计算得到全部像素的亮度平均 值, 将所述亮度平均值作为基准亮度值; 或,
根据测量到的所述每一个像素的亮度值计算得到出现概率最大的亮度 值, 将最大概率亮度值作为基准亮度值; 或, 根据测量到的所述每一个像素的亮度值比较得到亮度最大值或亮度最小 值, 将所述亮度最大值或所述亮度最小值作为基准亮度值。
6、 根据权利要求 1-4任一所述的显示补偿方法, 其中, 在得到补偿系数 之后, 所述方法还包括:
将所述补偿系数存储在非易失性存储器中, 以便在所述显示装置开启或 复位时对每一个像素的信号进行补偿修正。
7、 一种显示补偿装置, 包括:
测量单元,被配置为当处于未补偿状态的显示装置输出全色测试画面时, 对所述显示装置输出的全色测试画面中的每一个像素进行亮度测量;
计算单元, 被配置为根据测量到的所述每一个像素的亮度值得到基准亮 度值;
处理单元, 被配置为根据所述基准亮度值与所述每一个像素的亮度值得 到所述每一个像素的补偿系数;
补偿单元, 被配置为根据所述补偿系数分别对输入所述每一个像素的信 号进行补偿修正。
8、根据权利要求 7所述的显示补偿装置, 其中, 所述全色测试画面包括 全白测试画面, 或者所述全色测试画面分别包括全红测试画面、 全绿测试画 面以及全蓝测试画面;
所述测量单元被配置为对所述显示装置输出的全色测试画面中的每一个 像素分别进行红色 R值、 绿色 G值以及蓝色 B值的亮度测量。
9、根据权利要求 8所述的显示补偿装置, 其中, 所述计算单元被配置为 根据测量到的所述每一个像素的 R值、 G值以及 B值的亮度分别得到基准 R 值亮度、 基准 G值亮度以及基准 B值亮度。
10、 根据权利要求 9所述的显示补偿装置, 其中, 所述处理单元包括: RGB处理模块,用于将所述基准 R值亮度分别除以所述每一个像素的 R 值亮度、 将所述基准 G值亮度分别除以所述每一个像素的 G值亮度、 将所述 基准 B值亮度分别除以所述每一个像素的 B值亮度, 分别得到所述每一个像 素的 R分量补偿系数、 G分量补偿系数以及 B分量补偿系数。
11、 根据权利要求 7-10任一所述的显示补偿装置, 其中, 所述计算单元 包括:
均值计算模块, 被配置为根据测量到的所述每一个像素的亮度值计算得 到全部像素的亮度平均值, 将所述亮度平均值作为基准亮度值; 或, 概率计算模块, 被配置为根据测量到的所述每一个像素的亮度值计算得 到出现概率最大的亮度值, 将最大概率亮度值作为基准亮度值; 或,
最值计算模块, 被配置为根据测量到的所述每一个像素的亮度值比较得 到亮度最大值或亮度最小值, 将所述亮度最大值或所述亮度最小值作为基准 亮度值。
12、 根据权利要求 7-10任一所述的显示补偿装置, 其中, 所述装置还包 括:
存储单元, 被配置为将所述补偿系数存储在非易失性存储器中, 以便在 所述显示装置开启或复位时对每一个像素的信号进行补偿修正。
13、 一种显示补偿系统, 包括: 显示装置以及如权利要求 7-12任一所述 的显示补偿装置。
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