WO2019001355A1 - 一种显示面板的灰阶调整方法及装置 - Google Patents

一种显示面板的灰阶调整方法及装置 Download PDF

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Publication number
WO2019001355A1
WO2019001355A1 PCT/CN2018/092368 CN2018092368W WO2019001355A1 WO 2019001355 A1 WO2019001355 A1 WO 2019001355A1 CN 2018092368 W CN2018092368 W CN 2018092368W WO 2019001355 A1 WO2019001355 A1 WO 2019001355A1
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Prior art keywords
display panel
value
brightness
grayscale
preset
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PCT/CN2018/092368
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English (en)
French (fr)
Inventor
王明良
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惠科股份有限公司
重庆惠科金渝光电科技有限公司
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Priority to US16/625,146 priority Critical patent/US11302275B2/en
Publication of WO2019001355A1 publication Critical patent/WO2019001355A1/zh

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    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
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    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
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    • H04N1/407—Control or modification of tonal gradation or of extreme levels, e.g. background level
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    • H04N1/4078—Control or modification of tonal gradation or of extreme levels, e.g. background level dependent on references outside the picture using gradational references, e.g. grey-scale test pattern analysis
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/80—Camera processing pipelines; Components thereof
    • H04N23/84—Camera processing pipelines; Components thereof for processing colour signals
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Definitions

  • the present disclosure relates to the field of liquid crystal panel display, and in particular, to a gray scale adjustment method and apparatus for a display panel.
  • unevenness of brightness display also called mura phenomenon
  • a certain area of the panel is block-shaped due to the difference in display brightness.
  • Trace phenomenon reducing the quality level of the panel.
  • the technique of eliminating unevenness also called Demura technology
  • the technique of eliminating unevenness belongs to a kind.
  • this technology is mainly to illuminate the backplane, through the CCD (Charge-coupled Device) optical camera to extract the luminance signal, to detect the unevenness of the display image, based on the central area of the panel, by comparison The difference between the brightness of the other areas of the panel and the central area, and then calculate the display data to be compensated according to the standard Gamma2.2 curve (the gamma value of most displays is 2.2), so that the brightness of the whole panel is uniform.
  • CCD Charge-coupled Device
  • the technology for eliminating unevenness has the advantages of simple structure and flexible mode, so it is widely used at the present stage; however, the premise of calculating the compensation data is that the panel is already a standard Gamma2.2 curve, but the actual production process of the panel is impossible.
  • the Gamma curve of each piece is precisely controlled, which causes the uneven gray scale compensation value to be inaccurate and easily affects the final effect of De unevenness.
  • the main purpose of the present disclosure is to provide a gray scale adjustment method and device for a display panel, which aims to solve the problem that the final unevenness of the unevenness is caused by the inaccurate compensation value of the uneven mura during the process of manufacturing the liquid crystal display panel. .
  • the present disclosure provides a grayscale adjustment method for a display panel, the method comprising the following steps:
  • the display panel is driven to display by using the second common voltage, the plurality of modified gray scale voltages, and a preset initial gray scale voltage corresponding to 255 gray scales.
  • the method before the determining the target input gray level corresponding to the preset target brightness according to the actual gamma curve value, the method further includes:
  • n is an integer greater than or equal to 2;
  • the average of the reference gamma curve values is taken as the actual gamma curve value.
  • n is an integer greater than or equal to 5.
  • the calculating a reference gamma curve value of each reference image includes:
  • the gamma mathematical model is:
  • Tx is the reference output brightness
  • T255 is the corresponding output brightness when the input gray level is 255
  • To is the corresponding output brightness when the input gray level is 0
  • Lx is the reference input gray level
  • Gamma is the actual gamma curve value.
  • the method before the determining the target input gray level corresponding to the preset target brightness according to the actual gamma curve value, the method further includes:
  • the output brightness of the center point of the panel is used as a preset target brightness.
  • the method before the determining the target input gray level corresponding to the preset target brightness according to the actual gamma curve value, the method further includes:
  • the average value of the acquired output luminance is taken as the preset target luminance.
  • the method further includes:
  • the method further comprises burning the grayscale compensation value into the memory to achieve a compensation effect of the current image.
  • the display panel is a liquid crystal display panel.
  • the liquid crystal display panel can be applied to a computer display screen, a television display screen, and a tablet display screen.
  • the specific process of acquiring the actual gamma curve of the display panel is: providing a brightness sensing device, so that the display panel respectively displays a 0 grayscale image and a 255 grayscale image, and the brightness sensing device is utilized. Obtain the brightness when the display panel displays the 0 grayscale screen and the 255 grayscale screen, and use the display panel to display the 0 grayscale image and the brightness of the 255 grayscale image, and the preset actual gamma value to obtain the actual gamma of the display panel. curve.
  • the brightness of the display panel is detected by the identification module to determine whether the brightness of the display panel reaches the target brightness value.
  • the voltage offset is greater than 0 and less than or equal to 2V.
  • the first common voltage that causes the blinking value of the display panel to be a preset blinking value is specifically inputting an initial common voltage to the display panel and a preset corresponding 255 gray.
  • the initial gray scale voltage of the order causes the display panel to display a 255 gray scale picture, and detects the flicker value of the display panel while adjusting the initial common voltage until the flicker value of the display panel is a preset flicker value, and obtains the first common voltage.
  • two unequal initial gray scale voltages are preset for each preset gray scale.
  • the present disclosure further provides a gray scale adjusting device for a display panel, the device comprising:
  • An image acquisition module configured to perform image acquisition on the display panel to obtain a current image
  • An identification module configured to identify a non-uniform block in the current image, and detect an original output brightness of the uneven block and an original input gray level
  • a calculation module configured to determine, according to an actual gamma curve value, a target input gray level corresponding to a preset target brightness, where the actual gamma curve value is obtained by testing the display panel;
  • an adjustment module configured to use a difference between the original input grayscale and the target input grayscale as a grayscale compensation value of the uneven block.
  • the image acquisition module is an optical CCD camera.
  • the identification module is further configured to detect brightness of the display panel to determine whether the brightness of the display panel reaches a target brightness value.
  • the present disclosure also proposes a display device including a display panel and a gray scale adjusting device of the display panel as described above.
  • the method for adjusting the gray scale of the display panel proposed by the present disclosure can compensate the gray level value of the uneven area of the display panel according to the actual gamma curve and the preset target brightness during the process of producing each liquid crystal panel, thereby achieving the most accurate The compensation effect, thereby accurately and effectively eliminating the unevenness in the display panel, thereby solving the problem that the effect of the unevenness of the uneven mura compensation value is not accurate due to the inaccuracy of the uneven mura compensation value in the process of manufacturing the liquid crystal display panel,
  • the present disclosure can drive the display panel to display by using the second common voltage, the plurality of modified gray scale voltages, and the preset initial gray scale voltage corresponding to 255 gray scales, so that the region displaying the 255 gray scale can generate DC residual, and then display Other grayscale images offset the difference in brightness from other regions, which effectively improves the reverse afterimage and improves the display quality.
  • 1 is a schematic diagram showing a conventional acquisition method of a panel gray scale compensation value
  • FIG. 2 is a schematic structural diagram of a grayscale adjusting device of a display panel of a hardware operating environment according to an embodiment of the present disclosure
  • FIG. 3 is a schematic flow chart of a first embodiment of a gray scale adjustment method of a display panel of the present disclosure
  • FIG. 4 is a schematic diagram showing the principle of eliminating a uneven area of a display panel in an embodiment of the present disclosure
  • FIG. 5 is a schematic diagram showing the principle of data compensation for a non-uniform area of a display panel according to an embodiment of the present disclosure
  • FIG. 6 is a schematic flow chart of a second embodiment of a gray scale adjustment method of a display panel of the present disclosure
  • FIG. 7 is a schematic block diagram of a gray scale adjusting apparatus of a display panel according to an embodiment of the present disclosure.
  • FIG. 8 is a schematic block diagram of a display device according to an embodiment of the present disclosure.
  • the technology of eliminating unevenness also called Demura technology
  • the technology of eliminating unevenness has the advantages of simple structure and flexible mode, so it is widely used at this stage; however, the premise of calculating compensation data is that the panel is already a standard Gamma2.2 curve, but the actual panel It is impossible to accurately control the gamma-gamma curve of each piece during the production process, so it will easily affect the final effect of Demura technology.
  • Fig. 1 it is the principle of calculating compensation data of the commonly used Demura technology, such as the Gamma curve in Fig.
  • the abscissa is the input gray level R (that is, the objective physical quantity of things), and the ordinate is the output brightness T (ie
  • the uniformity assumes that the gamma curve is 2.2, the point T in the figure represents the target brightness, and the point R represents the actual brightness of the uneven area, so that the brightness of the uneven area is raised to
  • the target brightness of the display panel that is, the effect of obtaining a compensated brightness L1 in the figure
  • the compensation gray scale L2 corresponding to the abscissa is obtained on the curve of Gamma 2.2.
  • the shortcoming of this approach is that if the actual Gamma curve of the panel is not 2.2, then the compensation effect will be biased, and even the uneven mura phenomenon will not be improved.
  • FIG. 2 is a schematic structural diagram of a grayscale adjustment apparatus of a display panel in a hardware operating environment according to an embodiment of the present disclosure.
  • the apparatus may include a processor 1001, such as a CPU, a communication bus 1002, a hardware interface 1003, a camera 1004, and a memory 1005.
  • the communication bus 1002 is used to implement connection communication between these components.
  • the hardware interface 1003 may include a liquid crystal display panel.
  • the camera 1004 can be selected as a camera of a high-precision, high-resolution optical CCD camera that can achieve the resolution of the human eye.
  • the memory 1005 may be a high speed RAM memory or a non-volatile memory, and may include an EEPROM (Electrically Erasable Programmable Read-Only Memory) electrically erasable programmable read only memory.
  • EEPROM Electrically Erasable Programmable Read-Only Memory
  • FIG. 2 does not constitute a limitation to the device, and may include more or less components than those illustrated, or some components may be combined, or different component arrangements.
  • the memory 1005 as a computer storage medium may include an operating system, a data storage module, a hardware interface module, and a grayscale adjustment program of the display panel.
  • the camera 1004 is configured to perform image acquisition on the display panel;
  • the hardware interface 1003 is mainly used for data interaction with the display panel;
  • the processor 1001 and the memory 1005 in the device of the present disclosure may be disposed in the device.
  • the device invokes the grayscale adjustment program of the display panel stored in the memory 1005 by the processor 1001, and performs the following operations:
  • the display panel is driven to display by using the second common voltage, the plurality of modified gray scale voltages, and a preset initial gray scale voltage corresponding to 255 gray scales.
  • processor 1001 may call the grayscale adjustment program of the display panel stored in the memory 1005, and further perform the following operations:
  • n is an integer greater than or equal to 2;
  • the average of the reference gamma curve values is taken as the actual gamma curve value.
  • processor 1001 may call the grayscale adjustment program of the display panel stored in the memory 1005, and further perform the following operations:
  • processor 1001 may call the grayscale adjustment program of the display panel stored in the memory 1005, and further perform the following operations:
  • processor 1001 may call the grayscale adjustment program of the display panel stored in the memory 1005, and further perform the following operations:
  • the average value of the acquired output luminance is taken as the preset target luminance.
  • processor 1001 may call the grayscale adjustment program of the display panel stored in the memory 1005, and further perform the following operations:
  • processor 1001 may call the grayscale adjustment program of the display panel stored in the memory 1005, and further perform the following operations:
  • the display panel respectively displays a 0 grayscale image and a 255 grayscale image
  • the brightness sensing device is used to obtain brightness of the display panel display 0 grayscale image and 255 grayscale image
  • display The panel displays the brightness of the 0 grayscale image and the 255 grayscale image, and the preset actual gamma value, to obtain the actual gamma curve of the display panel.
  • image acquisition is performed on the display panel to obtain a current image; the uneven block in the current image is identified, and the original output brightness of the uneven block and the original input gray level are detected; according to the actual gamma
  • the curve value determines a target input gray level corresponding to the preset target brightness, the actual gamma curve value being obtained by testing the display panel; and the difference between the original input gray level and the target input gray level a value as a grayscale compensation value of the uneven block; obtaining, according to the actual gamma curve, a plurality of target luminance values respectively corresponding to a plurality of preset grayscales other than 255 grayscale; acquiring in the display When the panel displays 255 grayscale pictures, the flicker value of the display panel is a first common voltage of a preset flicker value; and the first common voltage is increased or decreased by a preset voltage offset to obtain a second common voltage; Inputting a second common voltage to the display panel, and sequentially inputting, to the display panel, a
  • the embodiment of the present disclosure can solve the problem that the final effect of eliminating the unevenness technology is poor due to the inaccurate compensation value of the uneven mura during the process of manufacturing the liquid crystal display panel, and the display panel is displayed 255.
  • the common voltage when the flicker value is a preset flicker value is the first common voltage
  • the first common voltage is the optimal common voltage when the display panel displays the 255 gray scale picture
  • the first common voltage a common voltage is increased or decreased by a preset voltage offset to obtain a second common voltage
  • a plurality of preset gray scales other than 255 gray scales are obtained according to the actual gamma curve of the display panel based on the second common voltage
  • Corresponding initial gray scale voltage is adjusted to obtain a modified gray scale voltage corresponding to a plurality of preset gray scales, that is, the second common voltage is used as an optimum common voltage of other gray scales other than the 255 gray scale
  • the display panel is displayed, it is driven by the second common voltage, the plurality of modified gray scale voltages,
  • the area displaying the white grid that is, the area of 255 gray scale
  • the area displaying the 0 gray scale will generate DC residual, so that when the black and white alternate checkerboard screen is changed to a preset grayscale screen. Because the DC residual effect makes the area of the previously displayed white grid brighter, the brightness difference between the previously displayed 255 gray scale and the area displaying the 0 gray scale can be offset, which effectively improves the reverse afterimage and improves the display quality; similarly, When the display panel performs normal display, the area displaying 255 gray levels also generates DC residual. When other gray scale pictures are displayed later, the area picture is bright, which offsets the brightness difference with other areas, effectively improving the reverse residual. Improve the display quality.
  • FIG. 3 is a schematic flow chart of a first embodiment of a gray scale adjustment method for a display panel according to the present disclosure.
  • the method includes the following steps:
  • the current image is the current display image of the display panel
  • the current display image (ie, the current image) can be captured by the optical CCD camera;
  • the display panel in this embodiment may be a liquid crystal display panel, and the liquid crystal display panel can be applied to display devices such as a computer display screen, a television display screen, and a tablet computer display screen.
  • S20 Identify a non-uniform block in the current image, and detect an original output brightness of the uneven block and an original input gray level;
  • unevenness may occur in the current display image displayed by the display panel during the process of producing the display panel (that is, there may be uneven blocks appearing); while the image is being collected on the display panel, Extracting a luminance signal of a middle uneven block of the current image;
  • the brightness signal includes an input gray level and an output brightness;
  • the input gray level is a gray level that the display can recognize, and the gray level represents an actual objective brightness, that is, an objective objective natural physical quantity, and
  • the display will continuously acquire different input voltages (also called gamma voltages), and different input voltages will react differently in gray scale;
  • the output brightness is subjective brightness perception of the human eye. Since people's perception of the stimulation of nature is non-linear, the outside world strengthens the stimulus in a certain proportion. For people, this stimulus is evenly increased. Similarly, the human eye is also nonlinear in perception of natural brightness, so people The subjective brightness of the eye perception is not exactly the same as the actual objective brightness.
  • the gamma curve (ie, the gamma curve) is used to coordinate the relationship between the subjective brightness perception of the human eye and the actual objective natural brightness, ie, to coordinate the output brightness and input gray.
  • the output brightness value of the initial display picture ie, the subjective brightness perception of the human eye
  • the grayscale value of the initially displayed picture ie, the input gray level
  • the display screen is displayed under this gray level.
  • the display is uneven, that is, unevenness is generated; when detecting the uneven block, some unevenness is obvious, the human eye can see, some unevenness is not visible to the human eye; the professional device detects and recognizes the machine.
  • the uneven block in the current image that is, the pixel (pixel) distribution feature is analyzed according to the display data in the collected current image, and the unevenness is identified according to the relevant algorithm; there are many related algorithms in the process of detecting unevenness
  • the embodiment is not limited herein.
  • S30 determining, according to an actual gamma curve value, a target input gray level corresponding to a preset target brightness, where the actual gamma curve value is obtained by testing the display panel;
  • the output brightness value of the display area is used, and the output brightness value is used as the preset target brightness value;
  • an output brightness of a panel center point of the current image may be acquired, and an output brightness of the panel center point is used as a preset target brightness. That is, the output brightness of the central area of the panel of the current image is obtained, and the difference between the brightness of the other areas of the panel and the central area is compared based on the central area of the panel.
  • the center point of the display panel is the best place for optical taste. Therefore, when debugging the panel, the center point of the panel is debugged;
  • the output brightness of each pixel in the area other than the uneven area in the current image may be acquired, and an average value of the output brightness of the pixel point is calculated, and an average value of the output brightness is used as a preset. Target brightness.
  • the picture on the left side has a white block unevenness W and a black block unevenness B in the horizontal direction, and the original (input) gray scale value and the target gray scale are performed by the above step S40.
  • the difference value is used as the compensation data of the uneven block (ie, the gray scale compensation value), and data compensation is performed on the two regions, that is, the display data of the region is the addition of the original display data and the compensation data, and the white region
  • the compensation data of uneven block is negative, that is, the display data will be reduced, and the data corresponding to the black block unevenness will be increased accordingly, so that uniform brightness can be obtained finally, and unevenness can be eliminated.
  • the actual Gamma curve value of the measured panel is 2.4
  • the dotted line is the Gamma 2.4 curve
  • the solid line is the Gamma 2.2 curve
  • the compensated grayscale value L3 obtained under the curve is different from the compensated grayscale value L2 obtained under the Gamma 2.4 curve, that is, the compensated grayscale values obtained by different Gamma curves are different, and the compensation gray on the Gamma2.2 curve is different.
  • the order value L3 is smaller than the compensated gray scale value L2 on the actual Gamma 2.4 curve, so only the compensation that meets the characteristics of the panel itself is optimal.
  • the obtained grayscale compensation value may be burned into an electrically erasable programmable read only memory (EEPROM) to achieve a compensation effect of the current image, that is, the gray
  • EEPROM electrically erasable programmable read only memory
  • the gray level value compensation is performed on the uneven area of the display panel according to the actual gamma curve and the preset target brightness, thereby achieving the most accurate compensation effect, and the accurate and effective pairing can be accurately and effectively The mura in the display panel is eliminated.
  • S50 Obtain, according to the actual gamma curve, a plurality of target brightness values respectively corresponding to a plurality of preset gray levels except 255 gray levels;
  • the specific process of obtaining the actual gamma curve of the display panel may be: providing a brightness sensing device, so that the display panel respectively displays a 0 grayscale image and a 255 grayscale image, and the brightness sense is utilized.
  • the measuring device obtains the brightness when the display panel displays the 0 grayscale image and the 255 grayscale image, and uses the display panel to display the brightness of the 0 grayscale image and the 255 grayscale image, and the preset actual gamma value, to obtain the actual display panel.
  • Gamma curve may be: providing a brightness sensing device, so that the display panel respectively displays a 0 grayscale image and a 255 grayscale image, and the brightness sense is utilized.
  • the measuring device obtains the brightness when the display panel displays the 0 grayscale image and the 255 grayscale image, and uses the display panel to display the brightness of the 0 grayscale image and the 255 grayscale image, and the preset actual gamma value, to obtain the actual display panel.
  • Gamma curve may be:
  • S60 Acquire a first common voltage that causes a flicker value of the display panel to be a preset flicker value when the display panel displays 255 grayscale pictures;
  • the first common voltage that causes the blinking value of the display panel to be a preset blinking value is specifically inputting an initial common voltage to the display panel and a preset corresponding to 255.
  • the initial gray scale voltage of the gray scale causes the display panel to display a 255 gray scale picture, and the initial public voltage is adjusted while detecting the flicker value of the display panel until the flicker value of the display panel is a preset flicker value, and the first common voltage is obtained. .
  • S70 increasing or decreasing the first common voltage by a preset voltage offset to obtain a second common voltage
  • the voltage offset is greater than 0 and less than or equal to 2V.
  • S80 input a second common voltage to the display panel, and sequentially input a preset plurality of initial grayscale voltages corresponding to the plurality of preset grayscales to the display panel, and each time an initial grayscale voltage is input, continuously Adjusting the initial gray scale voltage until the brightness of the display panel reaches a target luminance value corresponding to a preset gray scale corresponding to the initial gray scale voltage, and obtaining a plurality of modified gray scale voltages corresponding to the plurality of preset gray scales;
  • the identification module may be used to detect the brightness of the display panel to determine whether the brightness of the display panel reaches the target brightness value, and two unequal initial gray scale voltages are preset for each preset gray level.
  • S90 driving the display panel to display by using the second common voltage, the plurality of modified gray scale voltages, and a preset initial gray scale voltage corresponding to 255 gray scales.
  • FIG. 6 a second embodiment of a grayscale adjustment method for a display panel is provided. Based on the first embodiment of the above method, FIG. 6 is based on the embodiment shown in FIG.
  • the method before determining the target input gray level corresponding to the preset target brightness according to the actual gamma curve value in step S30, the method further includes the following steps:
  • the initial display state (ie, the current image) of the current display panel can be captured by the high-resolution resolution CCD camera, and the CCD camera additionally captures the display status of the current display panel.
  • Image information of different grayscale values is used as reference images in image information of different grayscale values, and the uneven regions in the reference images are identical to the uneven regions of the initial display state (ie, the current image);
  • increasing the number of pictures taken does not result in too much work and difficulty, and is simple and easy.
  • the middle three reference images mentioned above may be detected to extract corresponding reference input grayscale values and reference output luminances; then, according to the above reference input grayscale values, reference output luminances, and gamma mathematical models A reference gamma curve value of each reference image is calculated, the gamma mathematical model characterizing a correspondence between the reference input grayscale value and the reference output luminance.
  • each reference picture that is, it can represent the gamma voltage, that is, the objective physical quantity of the computer recognized object
  • the output brightness value ie, the subjective brightness perception of the human eye
  • mapping relationship ie, the gamma curve can reflect this mapping relationship between them, this mapping relationship can also be called gamma mathematical model
  • the gamma mathematical model is:
  • Tx is the reference output brightness
  • T255 is the corresponding output brightness when the input gray level is 255
  • To is the corresponding output brightness when the input gray level is 0
  • Lx is the reference input gray level
  • Gamma is the actual gamma curve value.
  • the embodiment introduces the gamma mathematical model such that the value of the gamma curve of each reference picture obtained by calculation is closer to the value of the actual gamma curve of the current display panel.
  • the gamma curve value of each reference image is calculated by the above formula, and the error between the calculated result and the actual gamma curve value of the display panel can be further reduced.
  • the actual gamma curve of the display panel is measured in advance, that is, by taking an image of the display panel at different gray levels, and combining the gamma mathematical model to detect the reference gamma curve value of the display panel at different gray levels, and
  • the average value of the reference gamma curve value is used as the actual gamma curve value closest to the actual condition of the display panel, and the actual gamma curve of the display panel can be effectively obtained during the production of the display panel, thereby enabling more accurate acquisition.
  • FIG. 7 is a schematic block diagram of a grayscale adjustment device for a display panel according to an embodiment of the present disclosure.
  • the grayscale adjustment device 302 of the display panel includes:
  • the image acquisition module 10 is configured to perform image collection on the display panel to obtain a current image.
  • the current image is the current display image of the display panel
  • the current display image (ie, the current image) can be captured by the optical CCD camera;
  • the display panel in this embodiment may be a liquid crystal display panel, and the liquid crystal display panel can be applied to display devices such as a computer display screen, a television display screen, and a tablet computer display screen.
  • the identification module 20 is configured to identify a non-uniform block in the current image, and detect an original output brightness of the uneven block and an original input gray level;
  • unevenness may occur in the current display image displayed by the display panel during the process of producing the display panel (that is, there may be uneven blocks appearing); while the image is being collected on the display panel, Extracting a luminance signal of a middle uneven block of the current image;
  • the brightness signal includes an input gray level and an output brightness;
  • the input gray level is a gray level that the display can recognize, and the gray level represents an actual objective brightness, that is, an objective objective natural physical quantity, and
  • the display will continuously acquire different input voltages (also called gamma voltages), and different input voltages will react differently in gray scale;
  • the output brightness is subjective brightness perception of the human eye. Since people's perception of the stimulation of nature is non-linear, the outside world strengthens the stimulus in a certain proportion. For people, this stimulus is evenly increased. Similarly, the human eye is also nonlinear in perception of natural brightness, so people The subjective brightness of the eye perception is not exactly the same as the actual objective brightness.
  • the gamma curve (ie, the gamma curve) is used to coordinate the relationship between the subjective brightness perception of the human eye and the actual objective natural brightness, ie, to coordinate the output brightness and input gray.
  • the output brightness value of the initial display picture ie, the subjective brightness perception of the human eye
  • the grayscale value of the initially displayed picture ie, the input gray level
  • the display screen is displayed under this gray level.
  • the display is uneven, that is, unevenness is generated; when detecting the uneven block, some unevenness is obvious, the human eye can see, some unevenness is not visible to the human eye; the professional device detects and recognizes the machine.
  • the uneven block in the current image that is, the pixel (pixel) distribution feature is analyzed according to the display data in the collected current image, and the unevenness is identified according to the relevant algorithm; there are many related algorithms in the process of detecting unevenness
  • the embodiment is not limited herein.
  • a calculating module 30 configured to determine, according to an actual gamma curve value, a target input gray level corresponding to a preset target brightness, where the actual gamma curve value is obtained by testing the display panel;
  • the output brightness value of the display area is used, and the output brightness value is used as the preset target brightness value;
  • an output brightness of a panel center point of the current image may be acquired, and an output brightness of the panel center point is used as a preset target brightness. That is, the output brightness of the central area of the panel of the current image is obtained, and the difference between the brightness of the other areas of the panel and the central area is compared based on the central area of the panel.
  • the center point of the display panel is the best place for optical taste. Therefore, when debugging the panel, the center point of the panel is debugged;
  • the output brightness of each pixel in the area other than the uneven area in the current image may be acquired, and an average value of the output brightness of the pixel point is calculated, and an average value of the output brightness is used as a preset. Target brightness.
  • the adjusting module 40 is configured to use a difference between the original input gray scale and the target input gray scale as a grayscale compensation value of the uneven block.
  • the adjustment module 40 sets the original (input) gray scale value and the target gray scale value.
  • the difference value is used as the compensation data of the uneven block (ie, the gray scale compensation value), and data compensation is performed on the two regions, that is, the display data of the region is the addition of the original display data and the compensation data, and the white block is
  • the uneven compensation data is negative, that is, the display data will be reduced, and the data corresponding to the black block unevenness will be increased accordingly, so that uniform brightness can be obtained finally, and unevenness can be eliminated.
  • the actual Gamma curve value of the measured panel is 2.4
  • the dotted line is the Gamma 2.4 curve
  • the solid line is the Gamma 2.2 curve
  • the compensated grayscale value L3 obtained under the curve is different from the compensated grayscale value L2 obtained under the Gamma 2.4 curve, that is, the compensated grayscale values obtained by different Gamma curves are different, and the compensation gray on the Gamma2.2 curve is different.
  • the order value L3 is smaller than the compensated gray scale value L2 on the actual Gamma 2.4 curve, so only the compensation that meets the characteristics of the panel itself is optimal.
  • the obtained grayscale compensation value is burned into an electrically erasable programmable read only memory (EEPROM) to realize the compensation effect of the current image, that is, the grayscale compensation value is transmitted to the display panel.
  • EEPROM electrically erasable programmable read only memory
  • FIG. 8 is a schematic block diagram of a display device according to an embodiment of the present disclosure.
  • the display device 300 may include a display panel 301 and a grayscale adjustment device 302 of the display panel, and the grayscale adjustment of the display panel Device 302 includes,
  • the image acquisition module 10 is configured to perform image collection on the display panel to obtain a current image.
  • the identification module 20 is configured to identify a non-uniform block in the current image, and detect an original output brightness of the uneven block and an original input gray level;
  • a calculating module 30 configured to determine, according to an actual gamma curve value, a target input gray level corresponding to a preset target brightness, where the actual gamma curve value is obtained by testing the display panel;
  • the adjusting module 40 is configured to use a difference between the original input gray scale and the target input gray scale as a grayscale compensation value of the uneven block.
  • the display panel in this embodiment may be a liquid crystal display panel, and the liquid crystal display panel can be applied to display devices such as a computer display screen, a television display screen, and a tablet computer display screen.
  • the gray level value compensation is performed on the uneven area of the display panel according to the actual gamma curve and the preset target brightness, thereby achieving the most accurate compensation effect, and the accurate and effective pairing can be accurately and effectively The mura in the display panel is eliminated.
  • the identification module 20 is further configured to detect the brightness of the display panel to determine whether the brightness of the display panel reaches the target brightness value.
  • an embodiment of the present disclosure further provides a computer readable storage medium, where the grayscale adjustment program of the display panel is stored, and the grayscale adjustment program of the display panel is implemented by the processor as follows: operating:
  • the display panel is driven to display by using the second common voltage, the plurality of modified gray scale voltages, and a preset initial gray scale voltage corresponding to 255 gray scales.
  • n is an integer greater than or equal to 2;
  • the average of the reference gamma curve values is taken as the actual gamma curve value.
  • An average value of the output luminances of the pixel points is calculated, and an average value of the output luminances is used as a preset target luminance.
  • the method further includes burning the grayscale compensation value into a memory to achieve a compensation effect of the current image.
  • the display panel is a liquid crystal display panel, and the liquid crystal display panel can be applied to a computer display screen, a television display screen, and a tablet computer display screen.
  • the specific process of acquiring the actual gamma curve of the display panel is: providing a brightness sensing device, so that the display panel respectively displays a 0 grayscale image and a 255 grayscale image, and the brightness sensing device is used to obtain
  • the display panel displays the brightness of the 0 grayscale image and the 255 grayscale image, and uses the display panel to display the 0 grayscale image and the brightness of the 255 grayscale image, and the preset actual gamma value to obtain the actual gamma curve of the display panel.
  • the brightness of the display panel is detected by the identification module to determine whether the brightness of the display panel reaches the target brightness value.
  • the voltage offset is greater than 0 and less than or equal to 2V.
  • the first common voltage that causes the blinking value of the display panel to be a preset blinking value is specifically inputting an initial common voltage to the display panel and a preset corresponding 255 grayscale
  • the initial gray scale voltage causes the display panel to display a 255 gray scale picture
  • the initial public voltage is adjusted while detecting the flicker value of the display panel until the blink value of the display panel is a preset flicker value, and the first common voltage is obtained.
  • the gamma curve value of the display panel at different gray levels is detected by capturing the image of the display panel at different gray levels, and the average value of the gamma curve value is detected by combining the gamma mathematical model.
  • the actual gamma curve value closest to the actual condition of the display panel the actual gamma curve of the display panel can be effectively obtained during the production of the display panel, thereby obtaining the gray scale value compensation value of the uneven region more accurately.
  • the invention solves the problem that the effect of the unevenness compensation value is not accurate enough to finally eliminate the unevenness in the process of manufacturing the liquid crystal display panel, and the present disclosure can utilize the second common voltage, the plurality of modified gray scale voltages, and the preset Corresponding to the initial gray scale voltage of 255 gray scales, the display panel is driven to display, which can generate DC residual in the area where 255 gray scale is displayed, and cancel the difference of brightness between other regions when displaying other gray scale images, thereby effectively improving the brightness. Reverse image sticking improves display quality.

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Abstract

一种显示面板的灰阶调整方法及装置（302），所述方法包括：对显示面板进行图像采集，获得当前图像（S10）；识别所述当前图像中的不匀区块，并检测所述不匀区块的原始输出亮度和原始输入灰阶（S20）；根据实际伽马曲线值确定与预设目标亮度对应的目标输入灰阶，所述实际伽马曲线值通过对所述显示面板进行测试获得（S30）；将所述原始输入灰阶与所述目标输入灰阶之间的差值作为所述不匀区块的灰阶补偿值（S40）。

Description

一种显示面板的灰阶调整方法及装置 技术领域
本公开涉及液晶面板显示领域，尤其涉及一种显示面板的灰阶调整方法及装置。
背景技术
液晶面板由于生产工艺复杂，管控难度大，在生产的过程中容易出现亮度显示不均匀的不匀现象(也叫mura现象)，即面板的某个区域由于显示亮度的差异造成的区块状的痕迹现象，降低面板的质量等级。近些年来，随着2K和4K等电视的普及，不匀现象越来越严重，要解决不匀现象，消除不匀技术(也叫Demura技术)便应运而生，消除不匀技术属于一种外部补偿技术，目前这种技术主要是将背板点亮，通过CCD(Charge-coupled Device)光学照相机将亮度信号抽取出来，检测出显示图像的不匀，以面板的中心区域为基准，通过比较面板其他区域的亮度与中心区域的差异，再根据标准的Gamma2.2曲线(目前绝大多数显示器的伽马值为2.2)去计算需要补偿的显示数据，达到整块面板的亮度均匀。
目前消除不匀技术具有结构简单，方式灵活的优点，因此在现阶段被广泛采用；但是计算补偿数据的前提是假定面板已经是标准的Gamma2.2曲线，但面板的实际生产过程中是不可能对每一片的Gamma曲线做到精准管控的，从而造成不匀灰阶补偿值不够精确，容易影响到De不匀的最终效果。
上述内容仅用于辅助理解本公开的技术方案，并不代表承认上述内容是现有技术。
发明内容
本公开的主要目的在于提供一种显示面板的灰阶调整方法及装置，旨在解决目前在制作液晶显示面板过程中，由于不匀mura补偿值不够精确导致最终消除不匀的效果不佳的问题。
为实现上述目的，本公开提供了一种显示面板的灰阶调整方法，所述方法包括以下步骤：
对显示面板进行图像采集，获得当前图像；
识别所述当前图像中的不匀区块，并检测所述不匀区块的原始输出亮度和原始输入灰阶；
根据实际伽马曲线值确定与预设目标亮度对应的目标输入灰阶，所述实际伽马曲线值通过对所述显示面板进行测试获得；
将所述原始输入灰阶与所述目标输入灰阶之间的差值作为所述不匀区块的灰阶补偿值；
根据所述实际伽马曲线获得分别与除255灰阶外的多个预设的灰阶对应的多个目标亮度值；
获取在所述显示面板显示255灰阶画面时，使得显示面板的闪烁值为一预设闪烁值的第一公共电压；
将所述第一公共电压增加或减少预设的电压偏移量，得到第二公共电压；
向所述显示面板输入第二公共电压，并依次向所述显示面板输入预设的对应多个预设的灰阶的多个初始灰阶电压，每输入一初始灰阶电压时，不断调整该初始灰阶电压直至所述显示面板的亮度达到对应该初始灰阶电压的预设的灰阶对应的目标亮度值，得到与多个预设的灰阶对应的多个修正灰阶电压；
利用所述第二公共电压、多个修正灰阶电压及预设的对应255灰阶的初始灰阶电压驱动显示面板进行显示。
可选地，所述根据实际伽马曲线值确定与预设目标亮度对应的目标输入灰阶之前，所述方法还包括：
获取所述显示面板在不同输入灰阶时的n张参考图像，所述n为大于等于2的整数；
计算各参考图像的参考伽马曲线值；
将所述参考伽马曲线值的平均值作为实际伽马曲线值。
可选地，所述n为大于等于5的整数。
可选地，所述计算各参考图像的参考伽马曲线值，具体包括：
检测各参考图像的参考输入灰阶和参考输出亮度；
根据所述参考输入灰阶、参考输出亮度和伽马数学模型计算各参考图像的参考伽马曲线值；所述伽马数学模型表征所述参考输入灰阶和参考输出亮度的对应关系。
可选地，所述伽马数学模型为：
Figure PCTCN2018092368-appb-000001
其中，Tx为参考输出亮度，T255为输入灰阶为255时对应的输出亮度，To为输入灰阶为0时对应的输出亮度，Lx为参考输入灰阶，Gamma为所述实际伽马曲线值。
可选地，在所述根据实际伽马曲线值确定与预设目标亮度对应的目标输入灰阶之前，所述方法还包括：
获取所述当前图像的面板中心点的输出亮度；
将所述面板中心点的输出亮度作为预设目标亮度。
可选地，在所述根据实际伽马曲线值确定与预设目标亮度对应的目标输入灰阶之前，所述方法还包括：
获取当前图像中不匀区域之外的其他区域中各像素点的输出亮度；
将获取的输出亮度的平均值作为预设目标亮度。
可选地，所述将所述原始输入灰阶与所述目标输入灰阶的差值作为所述不匀区块的灰阶补偿值之后，所述方法还包括：
将所述灰阶补偿值传输至显示面板，以使得所述显示面板将所述灰阶补偿值与所述不匀区块的原始输入灰阶相加后的结果作为所述不匀区块的新的输入灰阶，以消除当前图像中的不匀区块。
可选地，所述方法还包括将所述灰阶补偿值烧录到存储器中，以实现当前图像的补偿效果。
可选地，所述显示面板是液晶显示面板。
可选地，所述液晶显示面板能够适用于电脑显示屏、电视机显示屏以及平板电脑显示屏。
可选地，获取所述显示面板的实际伽马曲线的具体过程为：提供一亮度感测装置，使所述显示面板分别显示0灰阶画面及255灰阶画面，利用所述亮度感测装置获取显示面板显示0灰阶画面及255灰阶画面时的亮度，利用显示面板显示0灰阶画面及255灰阶画面时的亮度、及预设的实际伽马值，得到显示面板的实际伽马曲线。
可选地，利用识别模块检测显示面板的亮度，以判定显示面板的亮度是否达到目标亮度值。
可选地，所述电压偏移量大于0且小于等于2V。
可选地，获取在所述显示面板显示255灰阶画面时，使得显示面板的闪烁值为一预设闪烁值的第一公共电压具体为向显示面板输入初始公共电压及预设的对应255灰阶的初始灰阶电压，使显示面板显示255灰阶画面，调整初始公共电压的同时对显示面板的闪烁值进行侦测，直至显示面板的闪烁值为预设闪烁值，获得第一公共电压。
可选地，对应每一预设的灰阶预设有两个不相等的初始灰阶电压。
此外，为实现上述目的，本公开还提出一种显示面板的灰阶调整装置，所述装置包括：
图像获取模块，用于对显示面板进行图像采集，获得当前图像；
识别模块，用于识别所述当前图像中的不匀区块，并检测所述不匀区块的原始输出亮度和原始输入灰阶；
计算模块，用于根据实际伽马曲线值确定与预设目标亮度对应的目标输入灰阶，所述实际伽马曲线值通过对所述显示面板进行测试获得；
调整模块，用于将所述原始输入灰阶与所述目标输入灰阶之间的差值作为所述不匀区块的灰阶补偿值。
可选地，所述图像获取模块为光学CCD照相机。
可选地，所述识别模块还用于检测显示面板的亮度，以判定显示面板的亮度是否达到目标亮度值。
此外，为实现上述目的，本公开还提出一种显示装置，其中，包括显示面板及如上文 所述的显示面板的灰阶调整装置。
本公开提出的显示面板的灰阶调整的方法，能够在生产每一片液晶面板过程中，根据实际的伽马曲线及预设目标亮度对显示面板的不匀区域进行灰阶值补偿，达到最精准的补偿效果，进而精确有效地对显示面板中的不匀进行消除，从而解决了目前在制作液晶显示面板过程中，由于不匀mura补偿值不够精确导致最终消除不匀的效果不佳的问题，同时本公开可以利用第二公共电压、多个修正灰阶电压及预设的对应255灰阶的初始灰阶电压驱动显示面板进行显示，能够使显示255灰阶的区域产生直流残留，在之后显示其他灰阶画面时抵消与其他区域之间的亮度差异，从而有效地改善了反向残影，提升了显示品质。
附图说明
图1是显示面板灰阶补偿值的常规获取方法的示意图；
图2是本公开实施例方案涉及的硬件运行环境的显示面板的灰阶调整装置的结构示意图；
图3为本公开显示面板的灰阶调整方法第一实施例的流程示意图；
图4为本公开实施例中消除显示面板的不匀区域的原理示意图；
图5为本公开实施例中对显示面板的不匀区域进行数据补偿的原理示意图；
图6为本公开显示面板的灰阶调整方法第二实施例的流程示意图；
图7为本公开实施例提供的一种显示面板的灰阶调整装置的示意框图；
图8为本公开实施例提供的一种显示装置的示意框图。
本公开目的的实现、功能特点及优点将结合实施例，参照附图做进一步说明。
具体实施方式
应当理解，此处所描述的具体实施例仅用以解释本公开，并不用于限定本公开。
目前消除不匀技术(也叫Demura技术)具有结构简单，方式灵活的优点，因此在现阶段被广泛采用；但是计算补偿数据的前提是假定面板已经是标准的Gamma2.2曲线，但面板的实际生产过程中是不可能对每一片的伽马Gamma曲线做到精准管控的，所以会比较容易影响到Demura技术的最终效果。如图1所示，是目前常用的Demura技术的计算补偿数据的原理，如图1中的Gamma曲线，横坐标是输入灰阶R(即事物客观的物理量)，纵坐标是输出亮度T(即人眼主观亮度感受)，现阶段为了方便计算，统一会假定此Gamma曲线为2.2，图中点T代表目标亮度，点R代表不匀区域的实际亮度，那么为了将不匀区域的亮度提升到显示面板目标亮度(即最终达到一个如图中能够得到一个补偿亮度L1的效果)，需在Gamma2.2的曲线上得到对应横坐标的补偿灰阶L2即可。那么这种做法的缺点就是，如果面板实际的Gamma曲线不是2.2的话，那么补偿的效果就会有偏差，严重的甚至无法改善不匀mura现象。
参照图2，图2为本公开实施例方案涉及的硬件运行环境的显示面板的灰阶调整装置结构示意图。
如图2所示，该装置可以包括：处理器1001，例如CPU，通信总线1002、硬件接口1003，摄像头1004，存储器1005。其中，通信总线1002用于实现这些组件之间的连接通信。硬件接口1003可以包括液晶显示面板。摄像头1004可选为高精度高分辨率的光学CCD相机的摄像头，所述CCD相机能达到人眼的分辨率。存储器1005可以是高速RAM存储器，也可以是稳定的存储器(non-volatile memory)，同时可以包括EEPROM(Electrically Erasable Programmable Read-Only Memory)电可擦可编程只读存储器。
本领域技术人员可以理解，图2中示出的装置结构并不构成对装置的限定，可以包括比图示更多或更少的部件，或者组合某些部件，或者不同的部件布置。
如图2所示，作为一种计算机存储介质的存储器1005中可以包括操作系统、数据存储模块、硬件接口模块以及显示面板的灰阶调整程序。
在图2所示的装置中，摄像头1004，配置为对显示面板进行图像采集；硬件接口1003主要用于与显示面板进行数据交互；本公开装置中的处理器1001、存储器1005可以设置在装置中，所述装置通过处理器1001调用存储器1005中存储的显示面板的灰阶调整程序，并执行以下操作：
对显示面板进行图像采集，获得当前图像；
识别所述当前图像中的不匀区块，并检测所述不匀区块的原始输出亮度和原始输入灰阶；
根据实际伽马曲线值确定与预设目标亮度对应的目标输入灰阶，所述实际伽马曲线值通过对所述显示面板进行测试获得；
将所述原始输入灰阶与所述目标输入灰阶之间的差值作为所述不匀区块的灰阶补偿值；
根据所述实际伽马曲线获得分别与除255灰阶外的多个预设的灰阶对应的多个目标亮度值；
获取在所述显示面板显示255灰阶画面时，使得显示面板的闪烁值为一预设闪烁值的第一公共电压；
将所述第一公共电压增加或减少预设的电压偏移量，得到第二公共电压；
向所述显示面板输入第二公共电压，并依次向所述显示面板输入预设的对应多个预设的灰阶的多个初始灰阶电压，每输入一初始灰阶电压时，不断调整该初始灰阶电压直至所述显示面板的亮度达到对应该初始灰阶电压的预设的灰阶对应的目标亮度值，得到与多个预设的灰阶对应的多个修正灰阶电压；
利用所述第二公共电压、多个修正灰阶电压及预设的对应255灰阶的初始灰阶电压驱动显示面板进行显示。
进一步地，处理器1001可以调用存储器1005中存储的显示面板的灰阶调整程序，还执行以下操作：
获取所述显示面板在不同输入灰阶时的n张参考图像，所述n为大于等于2的整数；
计算各参考图像的参考伽马曲线值；
将所述参考伽马曲线值的平均值作为实际伽马曲线值。
进一步地，处理器1001可以调用存储器1005中存储的显示面板的灰阶调整程序，还执行以下操作：
检测各参考图像的参考输入灰阶和参考输出亮度；
根据所述参考输入灰阶、参考输出亮度和伽马数学模型计算各参考图像的参考伽马曲线值；所述伽马数学模型表征所述参考输入灰阶和参考输出亮度的对应关系。
进一步地，处理器1001可以调用存储器1005中存储的显示面板的灰阶调整程序，还执行以下操作：
获取所述当前图像的面板中心点的输出亮度，将所述面板中心点的输出亮度作为预设目标亮度。
进一步地，处理器1001可以调用存储器1005中存储的显示面板的灰阶调整程序，还执行以下操作：
获取当前图像中不匀区域之外的其他区域中各像素点的输出亮度；
将获取的输出亮度的平均值作为预设目标亮度。
进一步地，处理器1001可以调用存储器1005中存储的显示面板的灰阶调整程序，还执行以下操作：
将所述灰阶补偿值传输至显示面板，以使得所述显示面板将所述灰阶补偿值与所述不匀区块的原始输入灰阶相加后的结果作为所述不匀区块的新的输入灰阶，以消除当前图像中的不匀区块。
进一步地，处理器1001可以调用存储器1005中存储的显示面板的灰阶调整程序，还执行以下操作：
提供一亮度感测装置，使所述显示面板分别显示0灰阶画面及255灰阶画面，利用所述亮度感测装置获取显示面板显示0灰阶画面及255灰阶画面时的亮度，利用显示面板显示0灰阶画面及255灰阶画面时的亮度、及预设的实际伽马值，得到显示面板的实际伽马曲线。
本公开实施例，对显示面板进行图像采集，获得当前图像；识别所述当前图像中的不匀区块，并检测所述不匀区块的原始输出亮度和原始输入灰阶；根据实际伽马曲线值确定与预设目标亮度对应的目标输入灰阶，所述实际伽马曲线值通过对所述显示面板进行测试获得；将所述原始输入灰阶与所述目标输入灰阶之间的差值作为所述不匀区块的灰阶补偿值；根据所述实际伽马曲线获得分别与除255灰阶外的多个预设的灰阶对应的多个目标亮 度值；获取在所述显示面板显示255灰阶画面时，使得显示面板的闪烁值为一预设闪烁值的第一公共电压；将所述第一公共电压增加或减少预设的电压偏移量，得到第二公共电压；向所述显示面板输入第二公共电压，并依次向所述显示面板输入预设的对应多个预设的灰阶的多个初始灰阶电压，每输入一初始灰阶电压时，不断调整该初始灰阶电压直至所述显示面板的亮度达到对应该初始灰阶电压的预设的灰阶对应的目标亮度值，得到与多个预设的灰阶对应的多个修正灰阶电压；利用所述第二公共电压、多个修正灰阶电压及预设的对应255灰阶的初始灰阶电压驱动显示面板进行显示。本实施例通过本公开实施例的技术方案，能够解决目前在制作液晶显示面板过程中，由于不匀mura补偿值不够精确导致消除不匀技术的最终效果不佳的问题，同时在显示面板显示255灰阶的画面时取闪烁值为一预设闪烁值时的公共电压为第一公共电压，该第一公共电压即为显示面板在显示255灰阶画面时的最佳公共电压，之后将该第一公共电压增加或减少预设的电压偏移量得到第二公共电压，在第二公共电压的基础上依据该显示面板的实际伽马曲线对除255灰阶外的多个预设的灰阶对应的初始灰阶电压进行调整，得到与多个预设的灰阶对应的修正灰阶电压，也即以该第二公共电压作为除255灰阶外的其他灰阶的最佳公共电压，在显示面板进行显示时，利用第二公共电压、多个修正灰阶电压、及预设的对应255灰阶的初始灰阶电压对其进行驱动，在进行残影检测使显示面板保持显示黑白交替的棋盘格画面时，显示白格的区域也即255灰阶的区域会产生直流残留，使将黑白交替的棋盘格画面变为一预设检测灰阶的画面时，由于直流残留作用使之前显示白格的区域偏亮，能够抵消之前显示255灰阶与显示0灰阶的区域之间的亮度差异，有效地改善了反向残影，提升显示品质；同理，在显示面板进行正常显示时，显示255灰阶的区域同样产生直流残留，在之后显示其他灰阶画面时该区域画面偏亮，抵消与其他区域之间的亮度差异，有效地改善了反向残影，提升显示品质。
基于上述硬件结构，提出本公开显示面板的灰阶调整方法实施例。
参照图3，图3为本公开一种显示面板的灰阶调整方法第一实施例的流程示意图。
本实施例中，所述方法包括以下步骤：
S10：对显示面板进行图像采集，获得当前图像；
可理解的是，上述当前图像为该显示面板的当前显示画面；
在具体实现中，在点亮该显示面板后，可通过光学CCD照相机拍摄当前显示画面(即当前图像)；
需要说明的是，本实施例中的所述显示面板可以是液晶显示面板，该液晶显示面板可适用于电脑显示屏、电视机显示屏以及平板电脑显示屏等显示装置。
S20：识别所述当前图像中的不匀区块，并检测所述不匀区块的原始输出亮度和原始输入灰阶；
可理解的是，在生产该显示面板过程当中显示面板所展示的当前显示图像内可能会出 现不匀现象(即可能有不匀区块出现)；在对显示面板进行图像采集的同时，将所述当前图像的中不匀区块的亮度信号抽取出来；
需要说明的是，上述亮度信号包含一个输入灰阶和一个输出亮度；所述输入灰阶为显示器能够识别的灰阶，该灰阶表征一种实际客观亮度，也就是实物客观的自然物理量，并且显示器会不断获取不同的输入电压(也称之为伽马电压)，不同的输入电压所反应的灰阶是不同的；所述输出亮度为人眼主观亮度感受。由于人对自然界的刺激的感知是非线性的，外界以一定的比例加强刺激，对人来说，这个刺激是匀均增长的；同理，人眼对自然亮度感知是也非线性的，因此人眼感知的主观亮度和实际客观亮度并非完全相同，伽马曲线(即Gamma曲线)是用来协调人眼主观亮度感受和实际客观自然亮度这二者的映射关系，即为了协调输出亮度和输入灰阶这二者的映射关系，可以通过公式：输出值＝输入值Gamma反应这两者之间的关系。
可理解的是，最初显示画面的输出亮度值(即人眼主观亮度感受)是已知的；最初显示画面的灰阶值(即输入灰阶)也是已知的，只是这个灰阶下显示屏幕显示不均匀，即有不匀产生；在检测不匀区块时，有些不匀很明显，人眼可以看到，有些不匀很轻微人眼看不到；通过专业的设备去检测并机识别出所述当前图像中的不匀区块，即根据采集到的当前图像中的显示数据分析pixel(像素)分布特征，并根据相关算法识别出不匀；在检测不匀过程中的相关算法有很多种，本实施例在此不加以限制。
S30：根据实际伽马曲线值确定与预设目标亮度对应的目标输入灰阶，所述实际伽马曲线值通过对所述显示面板进行测试获得；
需要说明的是，在本实施例中，所述当前图像中会有一个均匀的亮度显示区域，将该显示区域的输出亮度值，并将该输出亮度值作为预设目标亮度值；
在具体实现中，可获取所述当前图像的面板中心点的输出亮度，将所述面板中心点的输出亮度作为预设目标亮度。即获取所述当前图像的面板中心区域的输出亮度，以面板的中心区域为基准，来比较面板其他区域的亮度与中心区域的差异。通常在实际生产显示面板过程中，显示面板的中心点是光学品味最好的地方，因此在调试面板时，都是以面板的中心点进行调试；
可选地，可通过获取当前图像中不匀区域之外的其他区域中各像素点的输出亮度，并计算所述像素点的输出亮度的平均值，将所述输出亮度的平均值作为预设目标亮度。
S40：将所述原始输入灰阶与所述目标输入灰阶之间的差值作为所述不匀区块的灰阶补偿值。
可理解的是，参考图4中假设左侧的图片示意水平方向有一个白色区块不匀W和一个黑色区块不匀B，通过上述步骤S40将原始(输入)灰阶值与目标灰阶值的差值作为所述不匀区块的补偿数据(即灰阶补偿值)，对两个区域做数据补偿，即该区域的显示数据将是原始显示数据与补偿数据的相加，白色区块不匀的补偿数据是负数，即显示数据会被 减小一些，而对应黑色区块不匀的数据会相应增加一些，这样最终可以得到均匀的亮度，实现不匀的消除。
在具体实现中，参考图5，假设测得面板实际Gamma曲线值为2.4，所示虚线为Gamma2.4曲线，实线为Gamma 2.2曲线；可以看到，补偿同样的亮度差L1，在Gamma 2.2曲线下得到的补偿灰阶值L3与在Gamma 2.4曲线下得到的补偿灰阶值L2是不同的，即不同的Gamma曲线得到的补偿灰阶值是不同的，在Gamma2.2曲线上的补偿灰阶值L3要小于实际Gamma2.4曲线上的补偿灰阶值L2，因此只有符合面板本身特性的补偿才是最优的。
在步骤S40之后，可将所述得到的灰阶补偿值烧录到电可擦可编程只读存储器EEPROM(Electrically Erasable Programmable Read-Only Memory)中，以实现当前图像的补偿效果，即将所述灰阶补偿值传输至显示面板，以使得所述显示面板将所述灰阶补偿值与所述不匀区块的原始输入灰阶相加后的结果作为所述不匀区块的新的输入灰阶，以消除当前图像中的不匀区块(mura现象)。
本实施例在生产制造每一片液晶面板过程中，根据实际的伽马曲线及预设目标亮度对显示面板的不匀区域进行灰阶值补偿，进而达到最精准的补偿效果，能够精确有效地对显示面板中的不匀(mura)进行消除。
S50：根据所述实际伽马曲线获得分别与除255灰阶外的多个预设的灰阶对应的多个目标亮度值；
在具体实现中，获取所述显示面板的实际伽马曲线的具体过程可以为：提供一亮度感测装置，使所述显示面板分别显示0灰阶画面及255灰阶画面，利用所述亮度感测装置获取显示面板显示0灰阶画面及255灰阶画面时的亮度，利用显示面板显示0灰阶画面及255灰阶画面时的亮度、及预设的实际伽马值，得到显示面板的实际伽马曲线。
S60：获取在所述显示面板显示255灰阶画面时，使得显示面板的闪烁值为一预设闪烁值的第一公共电压；
在具体实现中，获取在所述显示面板显示255灰阶画面时，使得显示面板的闪烁值为一预设闪烁值的第一公共电压具体为向显示面板输入初始公共电压及预设的对应255灰阶的初始灰阶电压，使显示面板显示255灰阶画面，调整初始公共电压的同时对显示面板的闪烁值进行侦测，直至显示面板的闪烁值为预设闪烁值，获得第一公共电压。
S70：将所述第一公共电压增加或减少预设的电压偏移量，得到第二公共电压；
可选的，所述电压偏移量大于0且小于等于2V。
S80：向所述显示面板输入第二公共电压，并依次向所述显示面板输入预设的对应多个预设的灰阶的多个初始灰阶电压，每输入一初始灰阶电压时，不断调整该初始灰阶电压直至所述显示面板的亮度达到对应该初始灰阶电压的预设的灰阶对应的目标亮度值，得到与多个预设的灰阶对应的多个修正灰阶电压；
在具体实现中，可利用识别模块检测显示面板的亮度，以判定显示面板的亮度是否达 到目标亮度值，同时对应每一预设的灰阶预设有两个不相等的初始灰阶电压。
S90：利用所述第二公共电压、多个修正灰阶电压及预设的对应255灰阶的初始灰阶电压驱动显示面板进行显示。
参照图6，本公开一种显示面板的灰阶调整方法的第二实施例，基于上述方法的第一实施例，图6以基于图3所示的实施例为例。
本实施例中，在步骤S30根据实际伽马曲线值确定与预设目标亮度对应的目标输入灰阶之前，所述方法还包括以下步骤：
S01：获取所述显示面板在不同输入灰阶时的n张参考图像，所述n为大于等于2的整数；
在具体实现中，驱动电路将显示面板点亮之后，可通过高精度分辨率CCD照相机会拍摄当前显示面板最初的显示状况(即当前图像)，同时CCD照相机会额外地拍摄当前显示面板的显示状况在不同灰阶值的图像信息，将这些不同灰阶值的图像信息作为参考图像，这些参考图像中的不匀区域和最初的显示状况(即当前图像)的不匀区域是完全相同的；
视实际需要决定，可使用原本的CCD相机去拍摄额外5张或更多张参考图像；以拍摄5张参考图像为例，这5张图片是通过将眼前显示面板中的画面取5个灰阶值：第1张取0灰阶、第5张取255灰阶，中间3张图取3个不同灰阶值时拍摄得到的5张图像。此外，增加拍摄图片的数量并不会带来过多的工作量和难度，简便易行。
S02：计算各参考图像的参考伽马曲线值；
在本实施例中，可以对上述提到的中间3张参考图像进行检测以提取对应的参考输入灰阶值和参考输出亮度；然后根据上述参考输入灰阶值、参考输出亮度和伽马数学模型计算各参考图像的参考伽马曲线值，所述伽马数学模型表征所述参考输入灰阶值和参考输出亮度的对应关系。
可理解的是，每一张参考图片的输入灰阶值(即它可以代表伽马电压，即计算机识别的事物客观的物理量)和输出亮度值(即人眼主观亮度感受)之间具有非线性的映射关系(即伽马曲线能够反映出它们之间的这种映射关系，这种映射关系也可称之为伽马数学模型)，这种非线性的映射关系通常默认地用公式：输出亮度＝输入灰阶Gamma来表示；由上述可知，每一张参考图片的输入灰阶值是已知的；同时，由于参考图片是通过CCD照相机获得的，因此每一张参考图片的输出亮度值是可以测量得到的，所述输出亮度值也是已知的；因此可以通过公式输出亮度＝输入灰阶Gamma求出各张参考图片的Gamma值，其中，各张参考图片的Gamma值不一定相同，它们之间会存在一定的误差；
在具体实现中，所述伽马数学模型为：
Figure PCTCN2018092368-appb-000002
其中，Tx为参考输出亮度，T255为输入灰阶为255时对应的输出亮度，To为输入灰阶为0时对应的输出亮度，Lx为参考输入灰阶，Gamma为所述实际伽马曲线值。
本实施例引入所述伽马数学模型，从而使得通过计算得到各张参考图片的伽马曲线的数值更加接近当前显示面板的实际伽马曲线的数值。通过上述公式计算各张参考图像的伽马曲线值，所计算的结果与显示面板的实际伽马曲线值的误差能够进一步缩小。
S03：将所述参考伽马曲线值的平均值作为实际伽马曲线值。
可理解的是，由上述可知，通过计算得到的各张参考图片的伽马曲线值会存在误差，因此通过求取它们的伽马曲线值的平均值对应的伽马曲线，便可以得到一个最接近面板实际状况的伽马曲线，将这个伽马曲线作为实际伽马曲线，再以这个实际伽马曲线作为基准，去找到显示面板的当前图像中各个不匀区域实际需要的补偿值，便可以做到最精确的补偿。
本实施例提前量测显示面板的实际伽马曲线，即通过拍摄显示面板在不同灰阶时的图像，并结合伽马数学模型检测显示面板在不同灰阶时的参考伽马曲线值，并将所述参考伽马曲线值的平均值作为最接近显示面板实际状况的实际伽马曲线值，能够在生产该显示面板过程中有效地获得该显示面板的实际伽马曲线，进而能够更加精确地获得不匀区域的灰阶补偿值。
参照图7，为本公开实施例提供的一种显示面板的灰阶调整装置的示意框图，所述显示面板的灰阶调整装置302包括：
图像获取模块10，用于对显示面板进行图像采集，获得当前图像；
可理解的是，上述当前图像为该显示面板的当前显示画面；
在具体实现中，在点亮该显示面板后，可通过光学CCD照相机拍摄当前显示画面(即当前图像)；
需要说明的是，本实施例中的所述显示面板可以是液晶显示面板，该液晶显示面板可适用于电脑显示屏、电视机显示屏以及平板电脑显示屏等显示装置。
识别模块20，用于识别所述当前图像中的不匀区块，并检测所述不匀区块的原始输出亮度和原始输入灰阶；
可理解的是，在生产该显示面板过程当中显示面板所展示的当前显示图像内可能会出现不匀现象(即可能有不匀区块出现)；在对显示面板进行图像采集的同时，将所述当前图像的中不匀区块的亮度信号抽取出来；
需要说明的是，上述亮度信号包含一个输入灰阶和一个输出亮度；所述输入灰阶为显示器能够识别的灰阶，该灰阶表征一种实际客观亮度，也就是实物客观的自然物理量，并且显示器会不断获取不同的输入电压(也称之为伽马电压)，不同的输入电压所反应的灰阶是不同的；所述输出亮度为人眼主观亮度感受。由于人对自然界的刺激的感知是非线性的，外界以一定的比例加强刺激，对人来说，这个刺激是匀均增长的；同理，人眼对自然亮度感知是也非线性的，因此人眼感知的主观亮度和实际客观亮度并非完全相同，伽马曲 线(即Gamma曲线)是用来协调人眼主观亮度感受和实际客观自然亮度这二者的映射关系，即为了协调输出亮度和输入灰阶这二者的映射关系，可以通过公式：输出值＝输入值Gamma反应这两者之间的关系。
可理解的是，最初显示画面的输出亮度值(即人眼主观亮度感受)是已知的；最初显示画面的灰阶值(即输入灰阶)也是已知的，只是这个灰阶下显示屏幕显示不均匀，即有不匀产生；在检测不匀区块时，有些不匀很明显，人眼可以看到，有些不匀很轻微人眼看不到；通过专业的设备去检测并机识别出所述当前图像中的不匀区块，即根据采集到的当前图像中的显示数据分析pixel(像素)分布特征，并根据相关算法识别出不匀；在检测不匀过程中的相关算法有很多种，本实施例在此不加以限制。
计算模块30，用于根据实际伽马曲线值确定与预设目标亮度对应的目标输入灰阶，所述实际伽马曲线值通过对所述显示面板进行测试获得；
需要说明的是，在本实施例中，所述当前图像中会有一个均匀的亮度显示区域，将该显示区域的输出亮度值，并将该输出亮度值作为预设目标亮度值；
在具体实现中，可获取所述当前图像的面板中心点的输出亮度，将所述面板中心点的输出亮度作为预设目标亮度。即获取所述当前图像的面板中心区域的输出亮度，以面板的中心区域为基准，来比较面板其他区域的亮度与中心区域的差异。通常在实际生产显示面板过程中，显示面板的中心点是光学品味最好的地方，因此在调试面板时，都是以面板的中心点进行调试；
可选地，可通过获取当前图像中不匀区域之外的其他区域中各像素点的输出亮度，并计算所述像素点的输出亮度的平均值，将所述输出亮度的平均值作为预设目标亮度。
调整模块40，用于将所述原始输入灰阶与所述目标输入灰阶之间的差值作为所述不匀区块的灰阶补偿值。
可理解的是，参考图4中假设左侧的图片示意水平方向有一个白色区块不匀W和一个黑色区块不匀B，调整模块40将原始(输入)灰阶值与目标灰阶值的差值作为所述不匀区块的补偿数据(即灰阶补偿值)，对两个区域做数据补偿，即该区域的显示数据将是原始显示数据与补偿数据的相加，白色区块不匀的补偿数据是负数，即显示数据会被减小一些，而对应黑色区块不匀的数据会相应增加一些，这样最终可以得到均匀的亮度，实现不匀的消除。
在具体实现中，参考图5，假设测得面板实际Gamma曲线值为2.4，所示虚线为Gamma2.4曲线，实线为Gamma 2.2曲线；可以看到，补偿同样的亮度差L1，在Gamma 2.2曲线下得到的补偿灰阶值L3与在Gamma 2.4曲线下得到的补偿灰阶值L2是不同的，即不同的Gamma曲线得到的补偿灰阶值是不同的，在Gamma2.2曲线上的补偿灰阶值L3要小于实际Gamma2.4曲线上的补偿灰阶值L2，因此只有符合面板本身特性的补偿才是最优的。最后将得到的灰阶补偿值烧录到电可擦可编程只读存储器EEPROM(Electrically Erasable  Programmable Read-Only Memory)中，以实现当前图像的补偿效果，即将所述灰阶补偿值传输至显示面板，以使得所述显示面板将所述灰阶补偿值与所述不匀区块的原始输入灰阶相加后的结果作为所述不匀区块的新的输入灰阶，以消除当前图像中的不匀区块(mura现象)。
参照图8，为本公开实施例还提供的一种显示装置的示意框图，如图所示显示装置300可以包括显示面板301及显示面板的灰阶调整装置302，所述显示面板的灰阶调整装置302包括，
图像获取模块10，用于对显示面板进行图像采集，获得当前图像；
识别模块20，用于识别所述当前图像中的不匀区块，并检测所述不匀区块的原始输出亮度和原始输入灰阶；
计算模块30，用于根据实际伽马曲线值确定与预设目标亮度对应的目标输入灰阶，所述实际伽马曲线值通过对所述显示面板进行测试获得；
调整模块40，用于将所述原始输入灰阶与所述目标输入灰阶之间的差值作为所述不匀区块的灰阶补偿值。
需要说明的是，本实施例中的所述显示面板可以是液晶显示面板，该液晶显示面板可适用于电脑显示屏、电视机显示屏以及平板电脑显示屏等显示装置。
本实施例在生产制造每一片液晶面板过程中，根据实际的伽马曲线及预设目标亮度对显示面板的不匀区域进行灰阶值补偿，进而达到最精准的补偿效果，能够精确有效地对显示面板中的不匀(mura)进行消除。
进一步地，所述识别模块20还用于检测显示面板的亮度，以判定显示面板的亮度是否达到目标亮度值。
此外，本公开实施例还提出一种计算机可读存储介质，所述计算机可读存储介质上存储有显示面板的灰阶调整程序，所述显示面板的灰阶调整程序被处理器执行时实现如下操作：
对显示面板进行图像采集，获得当前图像；
识别所述当前图像中的不匀区块，并检测所述不匀区块的原始输出亮度和原始输入灰阶；
根据实际伽马曲线值确定与预设目标亮度对应的目标输入灰阶，所述实际伽马曲线值通过对所述显示面板进行测试获得；
将所述原始输入灰阶与所述目标输入灰阶之间的差值作为所述不匀区块的灰阶补偿值；
根据所述实际伽马曲线获得分别与除255灰阶外的多个预设的灰阶对应的多个目标亮度值；
获取在所述显示面板显示255灰阶画面时，使得显示面板的闪烁值为一预设闪烁值的第一公共电压；
将所述第一公共电压增加或减少预设的电压偏移量，得到第二公共电压；
向所述显示面板输入第二公共电压，并依次向所述显示面板输入预设的对应多个预设的灰阶的多个初始灰阶电压，每输入一初始灰阶电压时，不断调整该初始灰阶电压直至所述显示面板的亮度达到对应该初始灰阶电压的预设的灰阶对应的目标亮度值，得到与多个预设的灰阶对应的多个修正灰阶电压；
利用所述第二公共电压、多个修正灰阶电压及预设的对应255灰阶的初始灰阶电压驱动显示面板进行显示。
进一步地，所述显示面板的灰阶调整程序被处理器执行时还实现如下操作：
获取所述显示面板在不同输入灰阶时的n张参考图像，所述n为大于等于2的整数；
计算各参考图像的参考伽马曲线值；
将所述参考伽马曲线值的平均值作为实际伽马曲线值。
进一步地，所述显示面板的灰阶调整程序被处理器执行时还实现如下操作：
检测各参考图像的参考输入灰阶和参考输出亮度；
根据所述参考输入灰阶、参考输出亮度和伽马数学模型计算各参考图像的参考伽马曲线值；所述伽马数学模型表征所述参考输入灰阶和参考输出亮度的对应关系。
进一步地，所述显示面板的灰阶调整程序被处理器执行时还实现如下操作：
获取所述当前图像的面板中心点的输出亮度，将所述面板中心点的输出亮度作为预设目标亮度。
进一步地，所述显示面板的灰阶调整程序被处理器执行时还实现如下操作：
获取当前图像中不匀区域之外的其他区域中各像素点的输出亮度；
计算所述像素点的输出亮度的平均值，将所述输出亮度的平均值作为预设目标亮度。
进一步地，所述显示面板的灰阶调整程序被处理器执行时还实现如下操作：
将所述灰阶补偿值传输至显示面板，以使得所述显示面板将所述灰阶补偿值与所述不匀区块的原始输入灰阶相加后的结果作为所述不匀区块的新的输入灰阶，以消除当前图像中的不匀区块。
进一步地，所述方法还包括将所述灰阶补偿值烧录到存储器中，以实现当前图像的补偿效果。
进一步地，所述显示面板是液晶显示面板，所述液晶显示面板能够适用于电脑显示屏、电视机显示屏以及平板电脑显示屏。
进一步地，获取所述显示面板的实际伽马曲线的具体过程为：提供一亮度感测装置，使所述显示面板分别显示0灰阶画面及255灰阶画面，利用所述亮度感测装置获取显示面板显示0灰阶画面及255灰阶画面时的亮度，利用显示面板显示0灰阶画面及255灰阶画 面时的亮度、及预设的实际伽马值，得到显示面板的实际伽马曲线。
进一步地，利用识别模块检测显示面板的亮度，以判定显示面板的亮度是否达到目标亮度值。
进一步地，所述电压偏移量大于0且小于等于2V。
进一步地，获取在所述显示面板显示255灰阶画面时，使得显示面板的闪烁值为一预设闪烁值的第一公共电压具体为向显示面板输入初始公共电压及预设的对应255灰阶的初始灰阶电压，使显示面板显示255灰阶画面，调整初始公共电压的同时对显示面板的闪烁值进行侦测，直至显示面板的闪烁值为预设闪烁值，获得第一公共电压。
进一步地，对应每一预设的灰阶预设有两个不相等的初始灰阶电压。
本实施例通过上述方案，通过拍摄显示面板在不同灰阶时的图像，并结合伽马数学模型检测显示面板在不同灰阶时的伽马曲线值，并将所述伽马曲线值的平均值作为最接近显示面板实际状况的实际伽马曲线值，能够在生产该显示面板过程中有效地获得该显示面板的实际伽马曲线，进而能够更加精确地获得不匀区域的灰阶值补偿值，解决了目前在制作液晶显示面板过程中，由于不匀补偿值不够精确导致最终消除不匀的效果不佳的问题，同时本公开可以利用第二公共电压、多个修正灰阶电压及预设的对应255灰阶的初始灰阶电压驱动显示面板进行显示，能够使显示255灰阶的区域产生直流残留，在之后显示其他灰阶画面时抵消与其他区域之间的亮度差异，从而有效地改善了反向残影，提升了显示品质。
需要说明的是，在本文中，术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、物品或者系统不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过程、方法、物品或者系统所固有的要素。在没有更多限制的情况下，由语句“包括一个……”限定的要素，并不排除在包括该要素的过程、方法、物品或者系统中还存在另外的相同要素。
上述本公开实施例序号仅仅为了描述，不代表实施例的优劣。
通过以上的实施方式的描述，本领域的技术人员可以清楚地了解到上述实施例方法可借助软件加必需的通用硬件平台的方式来实现，当然也可以通过硬件，但很多情况下前者是更佳的实施方式。基于这样的理解，本公开的技术方案本质上或者说对现有技术做出贡献的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质(如ROM/RAM、磁碟、光盘)中，包括若干指令用以使得一台终端设备(可以是手机，计算机，服务器，空调器，或者网络设备等)执行本公开各个实施例所述的方法。
以上仅为本公开的可选实施例，并非因此限制本公开的专利范围，凡是利用本公开说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本公开的专利保护范围内。

Claims (20)

  1. 一种显示面板的灰阶调整方法，其中，所述方法包括：
    对显示面板进行图像采集，获得当前图像；
    识别所述当前图像中的不匀区块，并检测所述不匀区块的原始输出亮度和原始输入灰阶；
    根据实际伽马曲线值确定与预设目标亮度对应的目标输入灰阶，所述实际伽马曲线值通过对所述显示面板进行测试获得；
    将所述原始输入灰阶与所述目标输入灰阶之间的差值作为所述不匀区块的灰阶补偿值；
    根据所述实际伽马曲线获得分别与除255灰阶外的多个预设的灰阶对应的多个目标亮度值；
    获取在所述显示面板显示255灰阶画面时，使得显示面板的闪烁值为一预设闪烁值的第一公共电压；
    将所述第一公共电压增加或减少预设的电压偏移量，得到第二公共电压；
    向所述显示面板输入第二公共电压，并依次向所述显示面板输入预设的对应多个预设的灰阶的多个初始灰阶电压，每输入一初始灰阶电压时，不断调整该初始灰阶电压直至所述显示面板的亮度达到对应该初始灰阶电压的预设的灰阶对应的目标亮度值，得到与多个预设的灰阶对应的多个修正灰阶电压；
    利用所述第二公共电压、多个修正灰阶电压及预设的对应255灰阶的初始灰阶电压驱动显示面板进行显示。
  2. 如权利要求1所述的方法，其中，所述根据实际伽马曲线值确定与预设目标亮度对应的目标输入灰阶之前，所述方法还包括：
    获取所述显示面板在不同输入灰阶时的n张参考图像，所述n为大于等于2的整数；
    计算各参考图像的参考伽马曲线值；
    将所述参考伽马曲线值的平均值作为实际伽马曲线值。
  3. 如权利要求2所述的方法，其中，所述计算各参考图像的参考伽马曲线值，具体包括：
    检测各参考图像的参考输入灰阶和参考输出亮度；
    根据所述参考输入灰阶、参考输出亮度和伽马数学模型计算各参考图像的参考伽马曲线值；所述伽马数学模型表征所述参考输入灰阶和参考输出亮度的对应关系。
  4. 如权利要求3所述的方法，其中，所述伽马数学模型为：
    Figure PCTCN2018092368-appb-100001
    其中，Tx为参考输出亮度，T255为输入灰阶为255时对应的输出亮度，To为输入 灰阶为0时对应的输出亮度，Lx为参考输入灰阶，Gamma为所述实际伽马曲线值。
  5. 如权利要求2所述的方法，其中，所述n为大于等于5的整数。
  6. 如权利要求1所述的方法，其中，所述根据实际伽马曲线值确定与预设目标亮度对应的目标输入灰阶之前，所述方法还包括：
    获取所述当前图像的中心点的输出亮度，将所述当前图像的中心点的输出亮度作为预设目标亮度。
  7. 如权利要求1所述的方法，其中，所述根据实际伽马曲线值确定与预设目标亮度对应的目标输入灰阶之前，所述方法还包括：
    获取当前图像中不匀区域之外的其他区域中各像素点的输出亮度；
    将获取的输出亮度的平均值作为预设目标亮度。
  8. 如权利要求1所述的方法，其中，所述将所述原始输入灰阶与所述目标输入灰阶的差值作为所述不匀区块的灰阶补偿值之后，所述方法还包括：
    将所述灰阶补偿值传输至显示面板，以使得所述显示面板将所述灰阶补偿值与所述不匀区块的原始输入灰阶相加后的结果作为所述不匀区块的新的输入灰阶，以消除当前图像中的不匀区块。
  9. 如权利要求1所述的方法，其中，所述方法还包括将所述灰阶补偿值烧录到存储器中，以实现当前图像的补偿效果。
  10. 如权利要求1所述的方法，其中，所述显示面板是液晶显示面板。
  11. 如权利要求10所述的方法，其中，所述液晶显示面板能够适用于电脑显示屏、电视机显示屏以及平板电脑显示屏。
  12. 如权利要求1所述的方法，其中，获取所述显示面板的实际伽马曲线的具体过程为：提供一亮度感测装置，使所述显示面板分别显示0灰阶画面及255灰阶画面，利用所述亮度感测装置获取显示面板显示0灰阶画面及255灰阶画面时的亮度，利用显示面板显示0灰阶画面及255灰阶画面时的亮度、及预设的实际伽马值，得到显示面板的实际伽马曲线。
  13. 如权利要求1所述的方法，其中，利用识别模块检测显示面板的亮度，以判定显示面板的亮度是否达到目标亮度值。
  14. 如权利要求1所述的方法，其中，所述电压偏移量大于0且小于等于2V。
  15. 如权利要求1所述的方法，其中，获取在所述显示面板显示255灰阶画面时，使得显示面板的闪烁值为一预设闪烁值的第一公共电压具体为向显示面板输入初始公共电压及预设的对应255灰阶的初始灰阶电压，使显示面板显示255灰阶画面，调整初始公共电压的同时对显示面板的闪烁值进行侦测，直至显示面板的闪烁值为预设闪烁值，获得第一公共电压。
  16. 如权利要求1所述的方法，其中，对应每一预设的灰阶预设有两个不相等的初 始灰阶电压。
  17. 一种显示面板的灰阶调整装置，其中，所述装置包括：
    图像获取模块，用于对显示面板进行图像采集，获得当前图像；
    识别模块，用于识别所述当前图像中的不匀区块，并检测所述不匀区块的原始输出亮度和原始输入灰阶；
    计算模块，用于根据实际伽马曲线值确定与预设目标亮度对应的目标输入灰阶，所述实际伽马曲线值通过对所述显示面板进行测试获得；
    调整模块，用于将所述原始输入灰阶与所述目标输入灰阶之间的差值作为所述不匀区块的灰阶补偿值。
  18. 如权利要求17所述的灰阶调整装置，其中，所述图像获取模块为光学CCD照相机。
  19. 如权利要求17所述的灰阶调整装置，其中，所述识别模块还用于检测显示面板的亮度，以判定显示面板的亮度是否达到目标亮度值。
  20. 一种显示装置，其中，包括：
    显示面板；以及
    如权利要求17所述的显示面板的灰阶调整装置。
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