WO2016173009A1 - 屏幕的动态背光调节方法 - Google Patents

屏幕的动态背光调节方法 Download PDF

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WO2016173009A1
WO2016173009A1 PCT/CN2015/079275 CN2015079275W WO2016173009A1 WO 2016173009 A1 WO2016173009 A1 WO 2016173009A1 CN 2015079275 W CN2015079275 W CN 2015079275W WO 2016173009 A1 WO2016173009 A1 WO 2016173009A1
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Prior art keywords
value
brightness
sub
screen
backlight
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English (en)
French (fr)
Inventor
陈黎暄
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TCL China Star Optoelectronics Technology Co Ltd
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Shenzhen China Star Optoelectronics Technology Co Ltd
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Priority to US14/766,182 priority Critical patent/US9886915B2/en
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—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
    • G09G3/3406—Control of illumination source
    • G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
    • G09G3/3426—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines the different display panel areas being distributed in two dimensions, e.g. matrix
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/16—Calculation or use of calculated indices related to luminance levels in display data

Definitions

  • the present invention generally relates to the field of dynamic backlight technology, and more particularly to a dynamic backlight adjustment method for a screen.
  • Liquid crystal displays have long life, power saving, low operating voltage, high color rendering index, low temperature operation, fast response, and environmental protection. Therefore, liquid crystal displays have been widely used in various electronic devices (for example, LCD TVs). Or computer).
  • the screen of a liquid crystal display is a passive light-emitting device that cannot emit light by itself, so a backlight must be provided to uniformly illuminate the entire screen from the rear surface.
  • the human eye is very sensitive to the brightness, that is, if the brightness is the same.
  • the brightness is displayed, the brightness of the image displayed on the screen will not change much, and the contrast of the image will be lower.
  • the local dimming technology is to display a dark area on the screen, control the backlight corresponding to the area to “exting out”, and control the backlight corresponding to the area to “turn on” in the bright area of the screen, thereby reducing the screen leakage.
  • For contrast images improve the contrast of the displayed image.
  • the existing method of adjusting the dynamic backlight of the screen is not smooth in the backlight adjustment process, and the bright and dark transition of the displayed image is unnatural.
  • An exemplary embodiment of the present invention provides a dynamic backlight adjustment method for a screen to solve the technical problem that the smoothness in the backlight adjustment process is not good and the light and dark transition of the display screen is unnatural.
  • a dynamic backlight adjustment method for a screen comprising dividing a screen into a plurality of sub-areas, and performing the following steps for one of the plurality of sub-areas: a) determining a maximum grayscale value of the video input signal of the one sub-region when the current frame image is displayed; (b) corresponding to the brightness of the plurality of backlights according to the predetermined plurality of grayscale intervals And determining a backlight brightness corresponding to the maximum grayscale value; and (c) adjusting a backlight brightness corresponding to the one sub-region to a backlight brightness corresponding to the maximum grayscale value.
  • the method may further include performing steps (a), (b), and (c) on a partial sub-region or all sub-regions other than the one sub-region among the plurality of sub-regions.
  • the step (a) may include: (a1) detecting a maximum grayscale value of each color component in the video input signal of the one sub-region when the current frame image is displayed; (a2) selecting the detected maximum grayscale value.
  • the maximum value is used as the maximum grayscale value of the video input signal of the one sub-region.
  • the correspondence between the predetermined plurality of grayscale intervals and the brightness of the plurality of backlights can be obtained by: (d) performing brightness uniformization processing on the display brightness; (e) targeting the one sub The region uses the first backlight brightness to cause the backlight to emit light, and measures a first actual display brightness of the one sub-region corresponding to the brightness of the first backlight, and calculates a first corresponding to the measured first actual display brightness a grayscale value, and then a first grayscale interval formed by the derived first grayscale value, wherein the first grayscale interval includes only the first grayscale value; (f) the jth backlight is used for the one subregion
  • the source brightness causes the backlight to emit light, and measures the jth actual display brightness of the one sub-region corresponding to the brightness of the jth backlight, wherein j is a natural number greater than or equal to 2; (g) deriving the same as the measurement j actually displays the jth grayscale value corresponding to the brightness; (h) takes the calculated j
  • the step (d) may include: performing brightness uniformization processing on display brightness of each pixel point corresponding to the plurality of sub-areas, or performing brightness on display brightness of each pixel point corresponding to the one sub-area Homogenization treatment.
  • the step of performing brightness uniformization processing on display brightness of each pixel point corresponding to the plurality of sub-regions may include: (d1) causing a screen to display a predetermined image, and measuring each of the plurality of sub-regions respectively a luminance value of a pixel; (d2) calculating a luminance value of a pixel of the plurality of sub-regions (d3) comparing a luminance value of one pixel corresponding to the plurality of sub-regions with an average value of the luminance values; (d4) if a luminance value of the one pixel is greater than the luminance value For the average value, step (d5) is performed: decreasing the grayscale value of the one pixel point such that the luminance value of the one pixel point is equal to the average value of the luminance value; (d6) if the one pixel point If the brightness value is not greater than the average value of the brightness values, step (d7) is performed: keeping the gray level value of the one pixel point unchanged.
  • the step of performing brightness uniformization processing on the display brightness of each pixel corresponding to the one sub-area may include: (d11) causing the screen to display a predetermined image, and measuring each of the plurality of sub-areas separately a luminance value of all the pixels corresponding to the region; (d22) respectively determining a minimum value of the luminance of the pixel corresponding to each of the sub-regions; (d33) calculating an average value of the minimum values of the luminances of the pixels corresponding to the plurality of sub-regions; (d44) comparing a luminance value of one pixel corresponding to the one sub-region with an average value of the luminance minimum; (d55) if a luminance value of the one pixel is greater than an average of the luminance minimum And performing step (d66): decreasing a grayscale value of the one pixel point such that a luminance value of the one pixel point is equal to an average value of the luminance minimum value; (d77) if a brightness of the one
  • the predetermined image may be an image of an all white screen.
  • the step of dividing the screen into the plurality of sub-areas may include: determining an effective area of the screen, and then dividing the effective area of the screen into the plurality of sub-areas, wherein determining the effective area of the screen comprises: in the horizontal direction, Determining, respectively, a first boundary from the first horizontal edge of the screen to a first predetermined distance and a second boundary from the second horizontal edge of the screen to a first predetermined distance; and in the vertical direction, respectively determining a first vertical edge of the distance screen a third boundary that is a second predetermined distance and a fourth boundary that is a second predetermined distance from the screen; a region formed by the first boundary, the second boundary, the third boundary, and the fourth boundary is used as a screen Effective area.
  • the value of the first predetermined distance may be 0 ⁇ d 1 ⁇ 0.1W
  • d 1 is a first predetermined distance
  • W is a length in a vertical direction of the screen
  • the second predetermined distance may be a value range of 0. ⁇ d 2 ⁇ 0.1L
  • d 2 is a second predetermined distance
  • L is a length in the horizontal direction of the screen.
  • FIG. 1 illustrates a top view of a screen in accordance with an exemplary embodiment of the present invention
  • FIG. 2 illustrates a flow chart of a dynamic backlight adjustment method of a screen according to an exemplary embodiment of the present invention
  • FIG. 3 illustrates a flow chart of steps of determining a maximum grayscale value of a video input signal of a sub-region, in accordance with an exemplary embodiment of the present invention
  • FIG. 4 illustrates a flow chart of steps of determining a correspondence between a predetermined plurality of grayscale intervals and a plurality of backlight luminances, according to an exemplary embodiment of the present invention
  • FIG. 5 illustrates a flowchart of steps of performing luminance uniformization processing on display luminance of each pixel point corresponding to the plurality of sub-regions, according to an exemplary embodiment of the present invention
  • FIG. 6 illustrates a flow chart of steps of performing luminance uniformization processing on display luminance of each pixel point corresponding to the one sub-region, according to an exemplary embodiment of the present invention.
  • the method of adjusting a screen dynamic backlight firstly divides the screen into a plurality of sub-areas, and then performs the adjustment method on each of the plurality of sub-areas. Specifically, the effective area of the screen is first determined, and then the effective area of the screen is divided to divide the effective area into a plurality of sub-areas.
  • the step of determining an effective area of the screen may include: determining, in the horizontal direction, a first boundary that is a first predetermined distance from the first horizontal edge of the screen and a second predetermined edge that is a first predetermined distance from the second horizontal edge of the screen a second boundary; in the vertical direction, respectively determining a third boundary from the first vertical edge of the screen to a second predetermined distance and a fourth boundary from the second vertical edge of the screen to a second predetermined distance; The area formed by the second boundary, the third boundary, and the fourth boundary is used as an effective area of the screen.
  • the first predetermined distance ranges from 0 ⁇ d 1 ⁇ 0.1W
  • d 1 is a first predetermined distance
  • W is a length in a vertical direction of the screen
  • the second predetermined distance may range from 0 ⁇ d 2 ⁇ 0.1 L
  • d 2 is a second predetermined distance
  • L is a length in the horizontal direction of the screen.
  • FIG. 1 illustrates a top view of a screen in accordance with an exemplary embodiment of the present invention.
  • 1 is the edge of the screen
  • 2 is the effective area of the screen
  • X i is the i-th sub-area where the effective area of the screen is divided
  • 1 ⁇ i ⁇ n is the number of sub-areas.
  • FIG. 2 illustrates a flow chart of a dynamic backlight adjustment method of a screen according to an exemplary embodiment of the present invention.
  • step S10 a maximum grayscale value of a video input signal of the one sub-area when the current frame image is displayed is determined.
  • FIG. 3 illustrates a flow chart of the steps of determining a maximum grayscale value of a video input signal for a sub-region, in accordance with an exemplary embodiment of the present invention.
  • step S11 the maximum grayscale value of each color component in the video input signal of the one sub-region at the time of displaying the current frame image is detected.
  • each pixel point corresponding to the one sub-region has a corresponding video input signal containing each color component when the current frame image is displayed, and can detect each color component in all video input signals in the sub-region.
  • the maximum grayscale value Preferably, the maximum grayscale value of each of R (red), G (green), and B (blue) components in the video input signal can be detected.
  • step S12 the maximum value of the detected maximum grayscale values is selected as the maximum grayscale value of the video input signal of the one subregion.
  • the following formula may be used to calculate the maximum grayscale value of the video input signal of the one subregion.
  • Gray m max(R m ,G m ,B m ) (1)
  • Gray m is the maximum gray scale value of the video input signal of the one sub-region
  • R m is the maximum gray scale value of the red component in the video input signal of the one sub-region
  • G m is The maximum gray scale value of the green component in the video input signal of one sub-region
  • B m is the maximum gray scale value of the blue component in the video input signal of the one sub-region
  • max represents R m , G m , The maximum value in B m .
  • step S20 the backlight brightness corresponding to the maximum grayscale value is determined according to a correspondence between a predetermined plurality of grayscale intervals and a plurality of backlight luminances.
  • the correspondence between the predetermined plurality of grayscale intervals and the plurality of backlight luminances may be stored in advance, and when the maximum grayscale value of the video input signal of the one subregion is determined when the current frame image is displayed, The S20 determines that the maximum grayscale value is in the grayscale interval of the plurality of grayscale intervals, and then finds the backlight brightness corresponding to the grayscale interval according to the relationship between the grayscale interval and the backlight brightness.
  • step S30 the backlight brightness corresponding to the one sub-area is adjusted to the backlight brightness corresponding to the maximum gray level value.
  • a sub-area may correspond to an independent backlight control unit, and a backlight control unit corresponding to the one sub-area may generate a corresponding backlight control signal according to the determined brightness of the backlight corresponding to the maximum gray-scale value. Adjusting a brightness of the backlight corresponding to the one sub-area to a brightness of the backlight corresponding to the maximum gray level value.
  • FIG. 4 illustrates a flow chart of steps of determining a correspondence between a predetermined plurality of grayscale intervals and a plurality of backlight luminances, according to an exemplary embodiment of the present invention.
  • step S100 luminance uniformization processing is performed on the display luminance.
  • brightness uniformity processing may be performed on display brightness of each pixel point corresponding to the plurality of sub-areas.
  • the plurality of sub-regions may be collectively used as an object of luminance uniformization processing, and the luminance value of each pixel corresponding to the effective region may be measured and calculated.
  • An average value of luminance values of pixel points of the effective area, and brightness uniformization processing is performed on the luminance of the one pixel point based on a comparison result of the luminance values of one pixel point corresponding to the effective area and the average value.
  • the brightness uniformization process may be performed on the brightness of each pixel point corresponding to the one sub-area.
  • the one sub-area may be used as an object of brightness uniformization processing, and the brightness values of all the pixel points corresponding to each sub-area may be measured, and the pixel points corresponding to each sub-area are determined. And a minimum value of the brightness, and further calculating an average value of the brightness minimum values of the pixel points corresponding to the plurality of sub-areas, and based on the brightness value of the one pixel point corresponding to the one sub-area and the brightness minimum value As a result of the comparison of the average values, luminance uniformization processing is performed on the luminance of one pixel corresponding to the one sub-region.
  • step S200 the backlight is illuminated using the first backlight brightness for the i-th sub-area, and the first actual display brightness of the i-th sub-region corresponding to the first backlight brightness is measured, and the measurement is calculated.
  • the first actually displays the first grayscale value corresponding to the brightness, and then forms the first grayscale interval from the derived first grayscale value.
  • the first grayscale interval includes only the first grayscale value.
  • step S300 the backlight is illuminated using the jth backlight luminance for the i-th sub-region of the plurality of sub-regions, and the j-th actual display luminance of the i-th sub-region corresponding to the luminance of the jth backlight is measured.
  • step S400 a jth grayscale value corresponding to the measured jth actual display luminance is derived.
  • the jth grayscale value corresponding to the measured jth actual display brightness may be derived based on the value of the current GAMMA of the screen.
  • the value of GAMMA may range from 1.8 to 2.5, and preferably, the value of GAMMA may be 2.2.
  • the following formula may be used to calculate a jth grayscale value corresponding to the measured actual display brightness of the jth,
  • Gray[Lv(j)] is a jth grayscale value corresponding to the measured jth actual display luminance Lv(j), and Lv(j) is the jth actual display luminance of the measurement.
  • Lv(m) is the mth actual display brightness of the measurement, and a is the value of the current GAMMA of the screen.
  • 2 ⁇ j ⁇ m m is the number of backlight luminances used, and m is a natural number of 2 or more, and preferably 2 ⁇ m ⁇ 32.
  • the first grayscale value corresponding to the measured first actual display luminance in step S200 may also be calculated using equation (2).
  • step S500 the jth grayscale value is used as the endpoint value of the lower interval of the jth grayscale interval, and the j-1th grayscale value is used as the endpoint value of the upper interval of the jth grayscale interval to form the jth gray.
  • Order interval the upper interval of the jth grayscale interval is an open interval, and the lower interval of the jth grayscale interval is a closed interval.
  • the number of grayscale intervals is the same as the number of backlights used, that is, the number of grayscale intervals formed at this time is also m.
  • step S600 it is judged whether or not j is equal to m.
  • step S800 determining whether i is equal to n.
  • the representation of the gray-scale interval shown in Table 1 is merely an example, and the present invention is not limited thereto, and the gray-scale interval corresponding to the serial number 2 is taken as an example, and the gray-scale interval can also be expressed as [Gray[Lv] (1)]+1, Gray[Lv(2)]].
  • FIG. 5 illustrates each pixel point corresponding to the plurality of sub-regions according to an exemplary embodiment of the present invention.
  • the screen is caused to display a predetermined image, and the luminance values of each of the plurality of sub-regions are respectively measured.
  • the predetermined image may be an image of an all white screen, and the grayscale value of each pixel is 255.
  • the luminance value of each pixel point corresponding to the plurality of sub-regions may be measured by a CCD (Charge-coupled Device) array.
  • step S120 an average value of luminance values of pixel points of the plurality of sub-regions is calculated.
  • the following formula may be used to calculate an average value of luminance values of pixel points of the plurality of sub-regions
  • step S130 comparing the brightness value of the kth pixel point corresponding to the plurality of sub-regions with the average value of the brightness value, that is, determining whether the brightness value of the kth pixel point is greater than the brightness value. average value.
  • step S140 is performed to keep the grayscale value of the kth pixel unchanged.
  • the grayscale value of the kth pixel point is still 255 (ie, R, G in the video input signal of the kth pixel point, The grayscale value of each component of B is still 255).
  • step S150 is performed: respectively calculating a gray level value of the kth pixel point corresponding to the brightness value of the kth pixel point, and The grayscale value corresponding to the average of the luminance values.
  • the method of calculating the grayscale value of the pixel point corresponding to the luminance value of one pixel point is a common knowledge in the art, and the present invention will not be described in detail in this part.
  • step S160 a difference between the grayscale value of the kth pixel point and the grayscale value corresponding to the average value of the luminance value is calculated.
  • step S170 the grayscale value of the kth pixel point is subtracted from the difference value to update the grayscale value of the kth pixel point, and the kth pixel point is updated with the updated grayscale value. Displayed such that the luminance value of the kth pixel is equal to the average of the luminance values.
  • the grayscale value of the kth pixel point may be lowered by the difference value to update the grayscale value of the pixel point, which may be found by searching the white balance table. a grayscale value of each color component corresponding to the updated grayscale value of the pixel, and then controlling the pixel point according to the grayscale value of each color component corresponding to the pixel point, so that the pixel point brightness value is equal to the The average of the brightness values.
  • the above white balance table is a common knowledge of those skilled in the art, the content of this part of the present invention will not be described in detail.
  • step S180 it is judged whether or not k is equal to p, and p is a natural number greater than or equal to 1.
  • the display luminance of each of the plurality of sub-regions may be made close to (ie, less than or equal to) the average value of the luminance values.
  • FIG. 6 illustrates a flow chart of steps of performing luminance uniformization processing on the luminance of each pixel point corresponding to the one sub-region, according to an exemplary embodiment of the present invention.
  • the screen is caused to display a predetermined image, and the luminance values of each of the plurality of sub-regions are respectively measured.
  • the predetermined image may be an image of an all white screen, and the grayscale value of each pixel is 255.
  • the luminance value of each pixel point corresponding to the plurality of sub-regions may be measured by a CCD array.
  • step S102 brightness minimum values of pixel points corresponding to each of the plurality of sub-regions are respectively determined.
  • step S103 an average value of the minimum values of the luminances of the pixel points corresponding to the plurality of sub-regions is calculated.
  • the following formula may be used to calculate an average value of the minimum values of the brightness of the pixel points corresponding to the plurality of sub-regions,
  • step S104 comparing the luminance value of the rth pixel corresponding to the i-th sub-region with the average value of the luminance minimum, that is, determining whether the luminance value of the r-th pixel corresponding to the i-th sub-region is An average value greater than the minimum value of the brightness.
  • step S105 is performed: keeping the grayscale value of the rth pixel point unchanged. For example, in a case where the predetermined image is an image of an all white screen, at this time, the grayscale value of the rth pixel point is still 255 (ie, R, G in the video input signal of the rth pixel point, The grayscale value of each component of B is still 255).
  • step S106 is performed: respectively calculating a gray level value of the rth pixel point corresponding to the brightness value of the rth pixel point, and The gray scale value corresponding to the average value of the minimum value of the luminance.
  • step S107 the difference between the grayscale value of the rth pixel point and the grayscale value corresponding to the average value of the luminance minimum value is calculated.
  • step S108 the grayscale value of the rth pixel is subtracted from the difference to update the grayscale value of the rth pixel, and the rth pixel is updated with the grayscale value. Displayed such that the luminance value of the rth pixel is equal to the average of the luminance minimum.
  • the grayscale value of the rth pixel point may be lowered by the difference value to update the grayscale value of the pixel point, which may be found by searching the white balance table. a grayscale value of each color component corresponding to the updated grayscale value of the pixel, and then controlling the pixel point according to the grayscale value of each color component corresponding to the pixel point, so that the pixel point brightness value is equal to the The average of the minimum brightness.
  • the above white balance table is a common knowledge of those skilled in the art, the content of this part of the present invention will not be described in detail.
  • step S109 it is determined whether r is equal to q, q is the total number of pixel points included in the i-th sub-region, and q is a natural number greater than or equal to 1.
  • the luminance uniformization processing of the display luminance of each pixel of the i-th sub-region is completed. If it is still necessary to perform the above-described step of the luminance equalization processing on the partial sub-regions or all the sub-regions other than the i-th sub-region, the step S112 may be further performed to determine whether i is equal to n.
  • the display luminance of each of the plurality of sub-regions may be made close to (ie, less than or equal to) the average value of the luminance values.
  • the dynamic backlight adjustment method of the above screen when determining the correspondence between the predetermined plurality of gray scale intervals and the brightness of the plurality of backlights, performing brightness uniformization processing on the display brightness corresponding to one sub-area, so that the backlight adjustment process
  • the smoothness in the screen is better, and the bright and dark transition of the screen display is more natural.

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Abstract

一种屏幕的动态背光调节方法，所述方法包括，将屏幕划分为多个子区域，针对所述多个子区域中的一个子区域执行以下步骤：(a)确定当前帧图像显示时所述一个子区域的视频输入信号的最大灰阶值（S10）；(b)根据预定的多个灰阶区间与多个背光源亮度之间的对应关系，确定所述最大灰阶值所对应的背光源亮度（S20）；(c)将所述一个子区域对应的背光源亮度调节至与所述最大灰阶值对应的背光源亮度（S30）。采用上述屏幕的动态背光调节方法，能够使得背光调节过程中的平滑度更好、屏幕显示画面的亮暗过渡更自然。

Description

屏幕的动态背光调节方法 技术领域
本发明总体说来涉及动态背光技术领域，更具体地讲，涉及一种屏幕的动态背光调节方法。
背景技术
液晶显示器具有超长寿命、省电、低操作电压、高显色指数、低温操作、反应速度快、环保等特点，因此，液晶显示器已普遍的被应用于各种电子设备中(例如，液晶电视或电脑)。但是，液晶显示器的屏幕是一种被动发光器件，无法自行发光，因此必须设置背光源，从其后表面均匀地照亮整个屏幕。
由于屏幕上所显示的不同图像的明暗程度是不同的，同一图像的不同区域的明暗程度也是不同的，而人眼对于明暗的感觉，也就是亮度是非常敏感的，所以如果以同样的背光源亮度进行显示，屏幕所显示的图像的亮度就不会有太大变化，图像的对比度也就比较低。
动态背光技术(local dimming)就是在屏幕显示暗的区域，控制与该区域对应的背光源“熄灭”，在屏幕显示亮的区域，控制与该区域对应的背光源“打开”，从而降低屏幕漏光对对比度的影像，提高所显示的图像的对比度。
但是，现有的调节屏幕的动态背光的方法，在背光调节过程中的平滑度不好、显示的图像的亮暗过渡不自然。
发明内容
本发明的示例性实施例在于提供一种屏幕的动态背光调节方法，以解决在背光调节过程中的平滑度不好、显示画面的亮暗过渡不自然的技术问题。
根据本发明示例性实施例的一方面，提供一种屏幕的动态背光调节方法，所述方法包括，将屏幕划分为多个子区域，针对所述多个子区域中的一个子区域执行以下步骤：(a)确定当前帧图像显示时所述一个子区域的视频输入信号的最大灰阶值；(b)根据预定的多个灰阶区间与多个背光源亮度之间的对应关 系，确定所述最大灰阶值所对应的背光源亮度；(c)将所述一个子区域对应的背光源亮度调节至与所述最大灰阶值对应的背光源亮度。
可选地，所述方法可还包括：对所述多个子区域中的除所述一个子区域之外的部分子区域或全部子区域执行步骤(a)、(b)、(c)。
可选地，步骤(a)可包括：(a1)检测当前帧图像显示时所述一个子区域的视频输入信号中的各颜色分量的最大灰阶值；(a2)选取检测的最大灰阶值中的最大值作为所述一个子区域的视频输入信号的最大灰阶值。
可选地，所述预定的多个灰阶区间与多个背光源亮度之间的对应关系可通过以下步骤获得：(d)对显示亮度进行亮度均匀化处理；(e)针对所述一个子区域使用第一背光源亮度使背光源发光，并测量与第一背光源亮度对应的所述一个子区域的第一实际显示亮度，并推算出与所述测量的第一实际显示亮度对应的第一灰阶值，然后由推算出的第一灰阶值形成第一灰阶区间，其中，第一灰阶区间仅包括第一灰阶值；(f)针对所述一个子区域使用第j背光源亮度使背光源发光，并测量与第j背光源亮度对应的所述一个子区域的第j实际显示亮度，其中，j为大于等于2的自然数；(g)推算出与所述测量的第j实际显示亮度对应的第j灰阶值；(h)将推算出的第j灰阶值作为第j灰阶区间的下区间的端点值，将推算出的第j-1灰阶值作为第j灰阶区间的上区间的端点值，以形成第j灰阶区间，其中，第j灰阶区间的上区间为开区间，第j灰阶区间的下区间为闭区间；(i)判断j是否等于m，m为使用的背光源亮度的个数，且m为大于等于2的自然数；(j)如果j不等于m，则令j＝j+1，并返回执行步骤(f)～步骤(i)；(k)如果j等于m，则获得多个背光源亮度与多个灰阶区间的对应关系。
可选地，步骤(d)可包括：对所述多个子区域对应的每个像素点的显示亮度进行亮度均匀化处理，或者对所述一个子区域对应的每个像素点的显示亮度进行亮度均匀化处理。
可选地，对所述多个子区域对应的每个像素点的显示亮度进行亮度均匀化处理的步骤可包括：(d1)使得屏幕显示预定图像，并分别测量所述多个子区域对应的每个像素点的亮度值；(d2)计算所述多个子区域的像素点的亮度值 的平均值；(d3)将所述多个子区域对应的一个像素点的亮度值与所述亮度值的平均值做比较；(d4)如果所述一个像素点的亮度值大于所述亮度值的平均值，则执行步骤(d5)：降低所述一个像素点的灰阶值，以使所述一个像素点的亮度值等于所述亮度值的平均值；(d6)如果所述一个像素点的亮度值不大于所述亮度值的平均值，则执行步骤(d7)：保持所述一个像素点的灰阶值不变。
可选地，对所述一个子区域对应的每个像素点的显示亮度进行亮度均匀化处理的步骤可包括：(d11)使得屏幕显示预定图像，并分别测量所述多个子区域中的每个子区域对应的所有像素点的亮度值；(d22)分别确定所述每个子区域对应的像素点的亮度最小值；(d33)计算所述多个子区域对应的像素点的亮度最小值的平均值；(d44)将所述一个子区域对应的一个像素点的亮度值与所述亮度最小值的平均值做比较；(d55)如果所述一个像素点的亮度值大于所述亮度最小值的平均值，则执行步骤(d66)：降低所述一个像素点的灰阶值，以使所述一个像素点的亮度值等于所述亮度最小值的平均值；(d77)如果所述一个像素点的亮度值不大于所述亮度最小值的平均值，则执行步骤(d88)：保持所述一个像素点的灰阶值不变。
可选地，所述预定图像可为全白画面的图像。
可选地，将屏幕划分为多个子区域的步骤可包括：确定屏幕的有效区域，然后将屏幕的有效区域划分为多个子区域，其中，确定屏幕的有效区域的步骤包括：在水平方向上，分别确定距离屏幕的第一水平边缘为第一预定距离的第一边界和距离屏幕的第二水平边缘为第一预定距离的第二边界；在垂直方向上，分别确定距离屏幕的第一垂直边缘为第二预定距离的第三边界和距离屏幕的第二垂直边缘为第二预定距离的第四边界；将由第一边界、第二边界、第三边界、第四边界包围形成的区域作为屏幕的有效区域。
可选地，第一预定距离的取值范围可为0＜d1＜0.1W，d1为第一预定距离，W为屏幕垂直方向上的长度，第二预定距离的取值范围可为0＜d2＜0.1L，d2为第二预定距离，L为屏幕水平方向上的长度。
采用上述屏幕的动态背光调节方法，能够使得背光调节过程中的平滑度更好、显示画面的亮暗过渡更自然。
附图说明
图1示出根据本发明示例性实施例的屏幕的俯视图；
图2示出根据本发明示例性实施例的屏幕的动态背光调节方法的流程图；
图3示出根据本发明示例性实施例的确定一个子区域的视频输入信号的最大灰阶值的步骤的流程图；
图4示出根据本发明示例性实施例的确定预定的多个灰阶区间与多个背光源亮度之间的对应关系的步骤的流程图；
图5示出根据本发明示例性实施例的对所述多个子区域对应的每个像素点的显示亮度进行亮度均匀化处理的步骤的流程图；
图6示出根据本发明示例性实施例的对所述一个子区域对应的每个像素点的显示亮度进行亮度均匀化处理的步骤的流程图。
具体实施方式
现将详细描述本发明的示例性实施例，所述实施例的示例在附图中示出，其中，相同的标号始终指的是相同的部件。
根据本发明示例性实施例的屏幕动态背光的调节方法需首先将屏幕划分为多个子区域，然后再对所述多个子区域中的每个子区域执行所述调节方法。具体说来，先确定屏幕的有效区域，然后再对屏幕的有效区域进行划分，以将该有效区域划分为多个子区域。
具体说来，确定屏幕的有效区域的步骤可包括：在水平方向上，分别确定距离屏幕的第一水平边缘为第一预定距离的第一边界和距离屏幕的第二水平边缘为第一预定距离的第二边界；在垂直方向上，分别确定距离屏幕的第一垂直边缘为第二预定距离的第三边界和距离屏幕的第二垂直边缘为第二预定距离的第四边界；将由第一边界、第二边界、第三边界、第四边界包围形成的区域作为屏幕的有效区域。可选地，第一预定距离的范围为0＜d1＜0.1W，d1为第一预定距离，W为屏幕垂直方向上的长度，第二预定距离的范围可为0＜d2＜0.1L，d2为第二预定距离，L为屏幕水平方向上的长度。
图1示出根据本发明示例性实施例的屏幕的俯视图。
如图1所示，1为屏幕的边缘，2为屏幕的有效区域，其中Xi为屏幕的有效区域被划分出的第i个子区域，1≤i≤n，n为子区域的个数。
下面将参照图2来详细描述对所述多个子区域中的一个子区域执行屏幕动态背光的调节方法的步骤。
图2示出根据本发明示例性实施例的屏幕的动态背光调节方法的流程图。
参照图2，在步骤S10中，确定当前帧图像显示时所述一个子区域的视频输入信号的最大灰阶值。
图3示出根据本发明示例性实施例的确定一个子区域的视频输入信号的最大灰阶值的步骤的流程图。
参照图3，在步骤S11中，检测当前帧图像显示时所述一个子区域的视频输入信号中的各颜色分量的最大灰阶值。
具体说来，在当前帧图像显示时所述一个子区域对应的每个像素点都有对应的包含各颜色分量的视频输入信号，可检测该子区域中所有视频输入信号中的各颜色分量的最大灰阶值。优选地，可检测该视频输入信号中的R(红色)、G(绿色)、B(蓝色)各分量的最大灰阶值。
在步骤S12中，选取检测的最大灰阶值中的最大值作为所述一个子区域的视频输入信号的最大灰阶值。
作为示例，在检测该视频输入信号中的R、G、B各分量的最大灰阶值的情况下，可利用下面的公式来计算所述一个子区域的视频输入信号的最大灰阶值，
Graym＝max(Rm,Gm,Bm)   (1)
公式(1)中，Graym为所述一个子区域的视频输入信号的最大灰阶值，Rm为所述一个子区域的视频输入信号中的红色分量的最大灰阶值，Gm为所述一个子区域的视频输入信号中的绿色分量的最大灰阶值，Bm为所述一个子区域的视频输入信号中的蓝色分量的最大灰阶值，max表示取Rm、Gm、Bm中的最大值。
返回图2，在步骤S20中，根据预定的多个灰阶区间与多个背光源亮度之间的对应关系，确定所述最大灰阶值所对应的背光源亮度。
这里，可预先存储预定的多个灰阶区间与多个背光源亮度之间的对应关系，当确定出当前帧图像显示时所述一个子区域的视频输入信号的最大灰阶值时，在步骤S20中判断所述最大灰阶值处于多个灰阶区间中的那个灰阶区间，然后按照该灰阶区间与背光源亮度的关系，找到该灰阶区间所对应的背光源亮度。
在步骤S30中，将所述一个子区域对应的背光源亮度调节至与所述最大灰阶值对应的背光源亮度。
作为示例，一个子区域可对应一个独立的背光控制单元，与所述一个子区域对应的背光控制单元可根据确定的所述最大灰阶值所对应的背光源亮度来产生相应的背光控制信号，以将所述一个子区域对应的背光源亮度调节至与所述最大灰阶值对应的背光源亮度。
下面参照图4来详细介绍图2中的确定预定的多个灰阶区间与多个背光源亮度之间的对应关系的步骤。
图4示出根据本发明示例性实施例的确定预定的多个灰阶区间与多个背光源亮度之间的对应关系的步骤的流程图。
参照图4，在步骤S100中，对显示亮度进行亮度均匀化处理。
在一个示例中，可对所述多个子区域对应的每个像素点的显示亮度进行亮度均匀化处理。
具体说来，在本示例中，可将所述多个子区域(即，屏幕的有效区域)整体作为亮度均匀化处理的对象，可测量该有效区域对应的每个像素点的亮度值，并计算有效区域的像素点的亮度值的平均值，并基于该有效区域对应的一个像素点的亮度值与所述平均值的比较结果，来对所述一个像素点的亮度进行亮度均匀化处理。
在另一示例中，可对所述一个子区域对应的每个像素点的亮度进行亮度均匀化处理。
具体说来，在本示例中，可将所述一个子区域作为亮度均匀化处理的对象，可测量每个子区域对应的所有像素点的亮度值，并确定出所述每个子区域对应的像素点的亮度最小值，再计算所述多个子区域对应的像素点的亮度最小值的平均值，并基于所述一个子区域对应的一个像素点的亮度值与所述亮度最小值 的平均值的比较结果，来对所述一个子区域对应的一个像素点的亮度进行亮度均匀化处理。
在步骤S200中，针对第i子区域使用第一背光源亮度使背光源发光，并测量与第一背光源亮度对应的第i子区域的第一实际显示亮度，并推算出与所述测量的第一实际显示亮度对应的第一灰阶值，然后由推算出的第一灰阶值形成第一灰阶区间。这里，第一灰阶区间仅包括第一灰阶值。
在步骤S300中，针对所述多个子区域中的第i子区域，使用第j背光源亮度使背光源发光，并测量与第j背光源亮度对应的第i子区域的第j实际显示亮度。
在步骤S400中，推算出与所述测量的第j实际显示亮度对应的第j灰阶值。
可选地，可基于屏幕当前GAMMA的取值来推算出与测量的第j实际显示亮度对应的第j灰阶值。作为示例，GAMMA的取值范围可为1.8～2.5，优选地，GAMMA的取值可为2.2。
可选地，可利用下面的公式计算与测量的第j实际显示亮度对应的第j灰阶值，
Figure PCTCN2015079275-appb-000001
公式(2)中，Gray[Lv(j)]为与所述测量的第j实际显示亮度Lv(j)对应的第j灰阶值，Lv(j)为所述测量的第j实际显示亮度，Lv(m)为所述测量的第m实际显示亮度，a为屏幕当前GAMMA的取值。这里，2≤j≤m，m为使用的背光源亮度的个数，且m为大于等于2的自然数，优选地，2≤m≤32。这里，应理解，还可利用公式(2)来计算在步骤S200中与所述测量的第一实际显示亮度对应的第一灰阶值。
在步骤S500中，将第j灰阶值作为第j灰阶区间的下区间的端点值，将第j-1灰阶值作为第j灰阶区间的上区间的端点值，以形成第j灰阶区间。这里，第j灰阶区间的上区间为开区间，第j灰阶区间的下区间为闭区间。这里， 灰阶区间的个数与使用的背光源亮度的个数一致，即，此时形成的灰阶区间的个数也为m个。
在步骤S600中，判断j是否等于m。
如果j不等于m，则执行步骤S700：令j＝j+1，并返回执行步骤S300。
如果j等于m，则获得第i区域的多个背光源亮度与多个灰阶区间的对应关系，并继续执行步骤S800：判断i是否等于n。
如果i不等于n，则执行步骤S900：令i＝i+1，并返回执行步骤S200。
如果i等于n，则获得多个区域的多个背光源亮度与多个灰阶区间的对应关系。
作为示例，可参照下表1来由多个灰阶值形成多个灰阶区间：
Figure PCTCN2015079275-appb-000002
如上表所示，表1所示的灰阶区间的表示形式仅为示例，本发明不限于此，以与序号2对应的灰阶区间为例，该灰阶区间还可表示为[Gray[Lv(1)]+1,Gray[Lv(2)]]。
下面将参照图5来详细介绍对所述多个子区域对应的每个像素点的显示亮度进行亮度均匀化处理的步骤。
图5示出根据本发明示例性实施例的对所述多个子区域对应的每个像素点 的显示亮度进行亮度均匀化处理的步骤的流程图。
参照图5，在步骤S110中，使得屏幕显示预定图像，并分别测量所述多个子区域对应的每个像素点的亮度值。优选地，所述预定图像可为全白画面的图像，此时，每个像素点的灰阶值为255。作为示例，可通过CCD(Charge-coupled Device)阵列量测所述多个子区域对应的每个像素点的亮度值。
在步骤S120中，计算所述多个子区域的像素点的亮度值的平均值。
可选地，可利用下面的公式来计算所述多个子区域的像素点的亮度值的平均值，
Figure PCTCN2015079275-appb-000003
公式(3)中，
Figure PCTCN2015079275-appb-000004
为所述多个子区域的像素点的亮度值的平均值，Sk为所述多个子区域对应的第k个像素点的亮度值，1≤k≤p，p为所述多个子区域包含的全部像素点的个数。
在步骤S130中，将所述多个子区域对应的第k个像素点的亮度值与所述亮度值的平均值做比较，即，判断第k个像素点的亮度值是否大于所述亮度值的平均值。
如果第k个像素点的亮度值不大于(即，小于等于)所述亮度值的平均值，则执行步骤S140：保持第k个像素点的灰阶值不变。例如，在所述预定图像为全白画面的图像的情况下，此时，第k个像素点的灰阶值仍为255(即，第k个像素点的视频输入信号中的R、G、B各分量的灰阶值仍为255)。
如果第k个像素点的亮度值大于所述亮度值的平均值，则执行步骤S150：分别计算与第k个像素点的亮度值对应的第k个像素点的灰阶值，以及与所述亮度值的平均值对应的灰阶值。这里，计算与一个像素点的亮度值对应的该像素点的灰阶值的方法为本领域的公知常识，本发明对此部分内容不再赘述。
在步骤S160中，计算第k个像素点的灰阶值和与所述亮度值的平均值对应的灰阶值的差值。
在步骤S170中，将第k个像素点的灰阶值与所述差值相减，以更新第k个像素点的灰阶值，并使第k个像素点以更新后的灰阶值进行显示，从而使得第k个像素点的亮度值等于所述亮度值的平均值。
例如，在所述预定图像为全白画面的图像的情况下，可将第k个像素点的灰阶值降低所述差值以更新该像素点的灰阶值，可通过查找白平衡表格找到与该像素点更新后的灰阶值对应的各颜色分量的灰阶值，然后根据该像素点对应的各颜色分量的灰阶值控制像素点进行显示，以使该像素点亮度值等于所述亮度值的平均值。这里，由于上述白平衡表格为本领域技术人员的公知常识，本发明对此部分的内容不再详述。
在步骤S180中，判断k是否等于p，p为大于等于1的自然数。
如果k不等于p，则执行步骤S190：令k＝k+1，并返回执行步骤S130。
如果k等于p，则完成对所述多个子区域的每个像素点的显示亮度的亮度均匀化处理。这里，在完成对显示亮度的亮度均匀化处理的步骤之后，可使得所述多个子区域的每个像素点的显示亮度均接近于(即，小于或等于)所述亮度值的平均值。
下面参照图6来详细介绍对所述一个子区域对应的每个像素点的亮度进行亮度均匀化处理的步骤。
图6示出根据本发明示例性实施例的对所述一个子区域对应的每个像素点的亮度进行亮度均匀化处理的步骤的流程图。
参照图6，在步骤S101中，使得屏幕显示预定图像，并分别测量所述多个子区域对应的每个像素点的亮度值。优选地，所述预定图像可为全白画面的图像，此时，每个像素点的灰阶值为255。作为示例，可通过CCD阵列量测所述多个子区域对应的每个像素点的亮度值。
在步骤S102中，分别确定所述多个子区域中的每个子区域对应的像素点的亮度最小值。
在步骤S103中，计算所述多个子区域对应的像素点的亮度最小值的平均值。
可选地，可利用下面的公式来计算所述多个子区域对应的像素点的亮度最小值的平均值，
Figure PCTCN2015079275-appb-000005
公式(4)中，
Figure PCTCN2015079275-appb-000006
为所述多个子区域对应的像素点的亮度最小值的平均值，Si为第i子区域对应的像素点的亮度最小值。
在步骤S104中，将第i子区域对应的第r个像素点的亮度值与所述亮度最小值的平均值做比较，即，判断第i子区域对应的第r个像素点的亮度值是否大于所述亮度最小值的平均值。
如果第r个像素点的亮度值不大于(即，小于等于)所述亮度最小值的平均值，则执行步骤S105：保持第r个像素点的灰阶值不变。例如，在所述预定图像为全白画面的图像的情况下，此时，第r个像素点的灰阶值仍为255(即，第r个像素点的视频输入信号中的R、G、B各分量的灰阶值仍为255)。
如果第r个像素点的亮度值大于所述亮度最小值的平均值，则执行步骤S106：分别计算与第r个像素点的亮度值对应的第r个像素点的灰阶值，以及与所述亮度最小值的平均值对应的灰阶值。
在步骤S107中，计算第r个像素点的灰阶值和与所述亮度最小值的平均值对应的灰阶值的差值。
在步骤S108中，将第r个像素点的灰阶值与所述差值相减，以更新第r个像素点的灰阶值，并使第r个像素点以更新后的灰阶值进行显示，从而使得第r个像素点的亮度值等于所述亮度最小值的平均值。
例如，在所述预定图像为全白画面的图像的情况下，可将第r个像素点的灰阶值降低所述差值以更新该像素点的灰阶值，可通过查找白平衡表格找到与该像素点更新后的灰阶值对应的各颜色分量的灰阶值，然后根据该像素点对应的各颜色分量的灰阶值控制像素点进行显示，以使该像素点亮度值等于所述亮度最小值的平均值。这里，由于上述白平衡表格为本领域技术人员的公知常识，本发明对此部分的内容不再详述。
在步骤S109中，判断r是否等于q，q为第i个子区域包含的像素点的总个数，且q为大于等于1的自然数。
如果r不等于q，则执行步骤S111：令r＝r+1，并返回执行步骤S104。
如果r等于q，则完成对第i子区域的每个像素点的显示亮度的亮度均匀化处理。如果还需对所述多个子区域中的除第i子区域之外的部分子区域或全部子区域执行上述亮度均匀化处理的步骤，则可继续执行步骤S112：判断i是否等于n。
如果i不等于n，则执行步骤S113：令i＝i+1，并返回执行步骤S104。
如果i等于n，则完成对所述多个子区域的每个像素点的显示亮度的亮度均匀化处理。这里，在完成对显示亮度的亮度均匀化处理的步骤之后，可使得所述多个子区域的每个像素点的显示亮度均接近于(即，小于或等于)所述亮度值的平均值。
上述屏幕的动态背光调节方法，由于在确定预定的多个灰阶区间与多个背光源亮度之间的对应关系时，对一个子区域对应的显示亮度进行了亮度均匀化处理，使得背光调节过程中的平滑度更好、屏幕显示画面的亮暗过渡更自然。
上面已经结合具体示例性实施例描述了本发明，但是本发明的实施不限于此。在本发明的精神和范围内，本领域技术人员可以进行各种修改和变型，这些修改和变型将落入权利要求限定的保护范围之内。

Claims (11)

  1. 一种屏幕的动态背光调节方法，所述方法包括，将屏幕划分为多个子区域，针对所述多个子区域中的一个子区域执行以下步骤：
    (a)确定当前帧图像显示时所述一个子区域的视频输入信号的最大灰阶值；
    (b)根据预定的多个灰阶区间与多个背光源亮度之间的对应关系，确定所述最大灰阶值所对应的背光源亮度；
    (c)将所述一个子区域对应的背光源亮度调节至与所述最大灰阶值对应的背光源亮度。
  2. 根据权利要求1所述的方法，还包括：对所述多个子区域中的除所述一个子区域之外的部分子区域或全部子区域执行步骤(a)、(b)、(c)。
  3. 根据权利要求1所述的方法，其中，步骤(a)包括：
    (a1)检测当前帧图像显示时所述一个子区域的视频输入信号中的各颜色分量的最大灰阶值；
    (a2)选取检测的最大灰阶值中的最大值作为所述一个子区域的视频输入信号的最大灰阶值。
  4. 根据权利要求1所述的方法，其中，所述预定的多个灰阶区间与多个背光源亮度之间的对应关系通过以下步骤获得：
    (d)对显示亮度进行亮度均匀化处理；
    (e)针对所述一个子区域使用第一背光源亮度使背光源发光，并测量与第一背光源亮度对应的所述一个子区域的第一实际显示亮度，并推算出与所述测量的第一实际显示亮度对应的第一灰阶值，然后由推算出的第一灰阶值形成第一灰阶区间，其中，第一灰阶区间仅包括第一灰阶值；
    (f)针对所述一个子区域使用第j背光源亮度使背光源发光，并测量与第j背光源亮度对应的所述一个子区域的第j实际显示亮度，其中，j为大于等于2的自然数；
    (g)推算出与所述测量的第j实际显示亮度对应的第j灰阶值；
    (h)将推算出的第j灰阶值作为第j灰阶区间的下区间的端点值，将推算出的第j-1灰阶值作为第j灰阶区间的上区间的端点值，以形成第j灰阶区间，其中，第j灰阶区间的上区间为开区间，第j灰阶区间的下区间为闭区间；
    (i)判断j是否等于m，m为使用的背光源亮度的个数，且m为大于等于2的自然数；
    (j)如果j不等于m，则令j＝j+1，并返回执行步骤(f)～步骤(i)；
    (k)如果j等于m，则获得多个背光源亮度与多个灰阶区间的对应关系。
  5. 根据权利要求4所述的方法，其中，步骤(d)包括：对所述多个子区域对应的每个像素点的显示亮度进行亮度均匀化处理，或者对所述一个子区域对应的每个像素点的显示亮度进行亮度均匀化处理。
  6. 根据权利要求5所述的方法，其中，对所述多个子区域对应的每个像素点的显示亮度进行亮度均匀化处理的步骤包括：
    (d1)使得屏幕显示预定图像，并分别测量所述多个子区域对应的每个像素点的亮度值；
    (d2)计算所述多个子区域的像素点的亮度值的平均值；
    (d3)将所述多个子区域对应的一个像素点的亮度值与所述亮度值的平均值做比较；
    (d4)如果所述一个像素点的亮度值大于所述亮度值的平均值，则执行步骤(d5)：降低所述一个像素点的灰阶值，以使所述一个像素点的亮度值等于所述亮度值的平均值；
    (d6)如果所述一个像素点的亮度值不大于所述亮度值的平均值，则执行步骤(d7)：保持所述一个像素点的灰阶值不变。
  7. 根据权利要求5所述的方法，其中，对所述一个子区域对应的每个像素点的显示亮度进行亮度均匀化处理的步骤包括：
    (d11)使得屏幕显示预定图像，并分别测量所述多个子区域中的每个子区域对应的所有像素点的亮度值；
    (d22)分别确定所述每个子区域对应的像素点的亮度最小值；
    (d33)计算所述多个子区域对应的像素点的亮度最小值的平均值；
    (d44)将所述一个子区域对应的一个像素点的亮度值与所述亮度最小值的平均值做比较；
    (d55)如果所述一个像素点的亮度值大于所述亮度最小值的平均值，则执行步骤(d66)：降低所述一个像素点的灰阶值，以使所述一个像素点的亮度值等于所述亮度最小值的平均值；
    (d77)如果所述一个像素点的亮度值不大于所述亮度最小值的平均值，则执行步骤(d88)：保持所述一个像素点的灰阶值不变。
  8. 根据权利要求6所述的方法，其中，所述预定图像为全白画面的图像。
  9. 根据权利要求7所述的方法，其中，所述预定图像为全白画面的图像。
  10. 根据权利要求1所述的方法，其中，将屏幕划分为多个子区域的步骤包括：确定屏幕的有效区域，然后将屏幕的有效区域划分为多个子区域，
    其中，确定屏幕的有效区域的步骤包括：
    在水平方向上，分别确定距离屏幕的第一水平边缘为第一预定距离的第一边界和距离屏幕的第二水平边缘为第一预定距离的第二边界；
    在垂直方向上，分别确定距离屏幕的第一垂直边缘为第二预定距离的第三边界和距离屏幕的第二垂直边缘为第二预定距离的第四边界；
    将由第一边界、第二边界、第三边界、第四边界包围形成的区域作为屏幕的有效区域。
  11. 根据权利要求10所述的方法，其中，第一预定距离的取值范围为0＜d1＜0.1W，d1为第一预定距离，W为屏幕垂直方向上的长度，第二预定距离的取值范围为0＜d2＜0.1L，d2为第二预定距离，L为屏幕水平方向上的长度。
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