WO2016107267A1 - 背光控制方法和装置 - Google Patents

背光控制方法和装置 Download PDF

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Publication number
WO2016107267A1
WO2016107267A1 PCT/CN2015/093299 CN2015093299W WO2016107267A1 WO 2016107267 A1 WO2016107267 A1 WO 2016107267A1 CN 2015093299 W CN2015093299 W CN 2015093299W WO 2016107267 A1 WO2016107267 A1 WO 2016107267A1
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WIPO (PCT)
Prior art keywords
grayscale value
value
grayscale
gray
max
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PCT/CN2015/093299
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English (en)
French (fr)
Inventor
刘安昱
李国盛
杜慧
Original Assignee
小米科技有限责任公司
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Publication date
Application filed by 小米科技有限责任公司 filed Critical 小米科技有限责任公司
Priority to RU2016100188A priority Critical patent/RU2638080C2/ru
Priority to JP2016567122A priority patent/JP2017510856A/ja
Priority to BR112016001118A priority patent/BR112016001118A2/pt
Priority to KR1020157036862A priority patent/KR101779689B1/ko
Priority to MX2016000377A priority patent/MX357915B/es
Publication of WO2016107267A1 publication Critical patent/WO2016107267A1/zh

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—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
    • 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
    • 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
    • G09G3/36—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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G09G2320/0646—Modulation of illumination source brightness and image signal correlated to each other
    • 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
    • G09G2320/0686—Adjustment of display parameters with two or more screen areas displaying information with different brightness or colours
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/16—Calculation or use of calculated indices related to luminance levels in display data

Definitions

  • the present disclosure relates to the field of screen display technologies, and in particular, to a backlight control method and apparatus.
  • CABC Content Adaptive Brightness Control
  • CABC technology can adjust the relationship between the grayscale value of the image and the brightness of the screen backlight according to the image displayed on the screen, and effectively reduce the brightness of the screen backlight while substantially maintaining the display effect of the image. For example, increasing the grayscale value of the image by 30% makes the image brighter, and the backlight brightness of the LCD screen is reduced by 30% to make the image darker, so that the brightness of the image is basically consistent before and after processing, but reduced. 30% backlight power consumption.
  • the grayscale value of the pixels of the high grayscale value cannot be improved, and other low grays
  • the grayscale value of the pixel of the order value (such as black pixel) can be increased, which will cause the image contrast to be greatly reduced, which seriously affects the image display effect.
  • the embodiment of the present disclosure provides a backlight control method and device. .
  • the technical solution is as follows:
  • a backlight control method comprising:
  • each display block in the screen obtain a grayscale value of each pixel in the image to be displayed by the display block, and the screen includes at least one display block;
  • the grayscale value of the respective pixels is controlled to remain unchanged, and the backlight brightness of the display block is controlled to maintain the maximum backlight brightness.
  • the method further includes:
  • Obtaining a duty ratio corresponding to the grayscale value subinterval according to a preset correspondence where the preset correspondence includes a correspondence between different grayscale value subintervals and different duty ratios, and the duty
  • the size of the ratio is positively correlated with the magnitude of the grayscale value
  • the magnitude of the duty cycle is positively correlated with the brightness of the backlight
  • P 0 is the gray scale value threshold
  • P max is the maximum gray scale value that the screen can display, 0 ⁇ P 0 ⁇ P max ;
  • PWM Pulse Width Modulation
  • the method further includes:
  • a corresponding duty ratio is set for each grayscale value subinterval, and a correspondence relationship between the grayscale value subinterval and the duty ratio is saved.
  • the dividing the gray-scale value interval [0, P max ] into M gray-scale value sub-intervals includes:
  • the method further includes:
  • the predetermined number is set to 1 when the content that performs contrast loss on the image corresponds to backlight control CABC processing.
  • a backlight control apparatus comprising:
  • a first obtaining module configured to acquire, for each display block in the screen, a grayscale value of each pixel in the image to be displayed by the display block, where the screen includes at least one display block;
  • a second acquiring module configured to obtain a minimum value of a predetermined number of maximum grayscale values according to the grayscale value of each pixel
  • the control module is configured to control the grayscale value of the pixels to remain unchanged when the minimum value reaches the grayscale value threshold, and control the backlight brightness of the display block to maintain a maximum backlight brightness.
  • the device further includes:
  • a third acquiring module configured to acquire a grayscale value subinterval in which the minimum value is located when the minimum value does not reach the grayscale value threshold
  • the fourth acquiring module is configured to acquire a duty ratio corresponding to the grayscale value subinterval according to the preset correspondence, where the preset correspondence includes different grayscale value subintervals and different duty ratios Corresponding relationship, the magnitude of the duty ratio is positively correlated with the magnitude of the grayscale value, the magnitude of the duty cycle is positively correlated with the brightness of the backlight, and the grayscale value subinterval of the grayscale value is the largest [P 0 , The corresponding duty ratio of P max ] is 100%, P 0 is the gray scale value threshold, and P max is the maximum gray scale value that the screen can display, 0 ⁇ P 0 ⁇ P max ;
  • a transmitting module configured to send a PWM signal having the duty ratio to the backlight driving IC, the PWM signal being used to instruct the backlight driving IC to control a backlight brightness of the display block according to the duty ratio.
  • the device further includes:
  • a fifth obtaining module configured to acquire a grayscale value interval [0, P max ] corresponding to the screen
  • a dividing module configured to divide the grayscale value interval [0, Pmax ] into M grayscale value subintervals, M ⁇ 2 and M being an integer;
  • the first setting module is configured to respectively set a corresponding duty ratio for each grayscale value subinterval, and save a correspondence between the grayscale value subinterval and the duty ratio.
  • the dividing module includes:
  • the first dividing sub-module is configured to divide the gray-scale value interval [0, P max ] into the M gray-scale value sub-intervals by using an equal division manner, and the maximum gray-scale value corresponding to each gray-scale value sub-interval The difference from the minimum grayscale value is equal;
  • a second dividing sub-module configured to divide the gray-scale value interval [0, P max ] into the M gray-scale value sub-intervals by using a non-equal division method, and the i+1th gray-scale value sub-interval [P
  • the difference P (i+1)max - P (i+1)min between the maximum gray scale value and the minimum gray scale value corresponding to (i+1)min , P (i+1)max ] is greater than or equal to the first
  • the difference between the maximum gray scale value corresponding to the gray scale value subinterval [P (i)min , P (i) max ] and the minimum gray scale value P (i)max - P (i)min , P ( i+1)min P (i)max +1, 1 ⁇ i ⁇ M-1 and i is an integer.
  • the device further includes:
  • the second setting module is configured to set the predetermined number to be 1 when the contrast-lossless content of the image corresponds to the backlight control CABC processing.
  • a backlight control apparatus including:
  • a memory for storing executable instructions of the processor
  • processor is configured to:
  • each display block in the screen obtain a grayscale value of each pixel in the image to be displayed by the display block, and the screen includes at least one display block;
  • the grayscale value of the respective pixels is controlled to remain unchanged, and the backlight brightness of the display block is controlled to maintain the maximum backlight brightness.
  • FIG. 1 is a schematic structural diagram of a terminal for implementing backlight power saving control by using CABC technology
  • FIG. 2 is a flowchart of a backlight control method according to an exemplary embodiment
  • FIG. 3A is a flowchart of a backlight control method according to another exemplary embodiment
  • FIG. 3B is a schematic diagram of a histogram shown according to another exemplary embodiment
  • FIG. 3C is a schematic diagram showing a gray scale value distribution according to another exemplary embodiment
  • FIG. 3D is a schematic diagram showing another gray scale value distribution according to another exemplary embodiment
  • FIG. 4 is a block diagram of a backlight control apparatus according to an exemplary embodiment
  • FIG. 5 is a block diagram of a backlight control apparatus according to another exemplary embodiment
  • FIG. 6 is a block diagram of an apparatus, according to an exemplary embodiment.
  • the terminal involved has an LCD screen, which may be a Cold Cathode Fluorescent Lamp (CCFC) screen or a light emitting diode. : Light Emitting Diode; referred to as: LED) screen.
  • the terminal can be a mobile phone, a tablet computer, an e-book reader, a motion picture expert to compress a standard audio layer 3 (English: Moving Picture Experts Group Audio Layer III; abbreviation: MP3) player, and a motion picture expert compresses a standard audio layer 4 (English: Moving Picture Experts Group Audio Layer IV; referred to as: MP4) player, laptop portable computer and desktop computer, etc.
  • CCFC Cold Cathode Fluorescent Lamp
  • LED Light Emitting Diode
  • the terminal can be a mobile phone, a tablet computer, an e-book reader, a motion picture expert to compress a standard audio layer 3 (English: Moving Picture Experts Group Audio Layer III; abbreviation: MP3) player, and a motion picture expert compresses a standard audio layer 4
  • the terminal may be any of the terminals exemplified above having an LCD screen.
  • the terminal 10 includes an LCD screen 110, a screen driving integrated circuit (English: Integrated Circuit; IC) 120, a backlight driving IC 130, a backlight 140, and a central processing unit (English: Central Processing Unit; CPU) 150.
  • IC Integrated Circuit
  • CPU Central Processing Unit
  • the CPU 150 is electrically connected to the screen driving IC 120, and the CPU 150 is configured to transmit an image to be displayed to the screen driving IC 120.
  • the screen driving IC 120 is electrically connected to the LCD screen 110, and the screen driving IC 120 is used to control the LCD screen 110 to display an image.
  • the backlight driving IC 130 is electrically connected to the CPU 150 and/or the screen driving IC 120.
  • the backlight driving IC 130 is configured to receive a PWM signal sent by the CPU 150 and/or the screen driving IC 120, and control the backlight brightness of the backlight 140 according to the PWM signal.
  • the backlight control method provided by the embodiment of the present disclosure may be separately executed by the CPU 150 of FIG. 1 described above, or may be performed by the screen driving IC 120 alone, or may be performed by the CPU 150 and the screen driving IC 120.
  • the backlight control device provided by the embodiment of the present disclosure may be integrated into the CPU 150, or may be integrated into the screen driving IC 120, or different functional modules may be disposed in the CPU 150 and the screen driving IC 120.
  • FIG. 2 is a flowchart of a backlight control method according to an exemplary embodiment.
  • the backlight control method is applied to the terminal shown in FIG. 1 for illustration.
  • the backlight control method can include the following steps:
  • step 202 for each display block in the screen, the grayscale value of each pixel in the image to be displayed by the display block is obtained, and the screen includes at least one display block.
  • step 204 a minimum of the predetermined number of maximum grayscale values is obtained according to the grayscale value of each pixel.
  • step 206 when the minimum value reaches the grayscale value threshold, the grayscale value of each pixel is controlled to remain unchanged, and the backlight brightness of the display block is controlled to maintain the maximum backlight brightness.
  • the backlight control method obtains a grayscale value of each pixel in an image to be displayed in a display block, and then obtains a predetermined number of maximum grayscale values according to grayscale values of each pixel. Minimum value, and when the minimum value reaches the grayscale value threshold, the grayscale value of each pixel is controlled to remain unchanged, and the backlight brightness of the display block is controlled to maintain the maximum backlight brightness, that is, not in the display block.
  • the image is processed by CABC; when the pixel with high grayscale value in the image is solved, processing the image by CABC technology will result in a significant decrease in image contrast, which seriously affects the image display effect; When the pixels of the grayscale value are not subjected to CABC processing, the image contrast damage is avoided or reduced, and the image quality and display effect are improved.
  • FIG. 3A is a flowchart of a backlight control method according to another exemplary embodiment.
  • the present embodiment is applied to the terminal shown in FIG. 1 for illustration.
  • the backlight control method can include the following steps:
  • step 301 for each display block in the screen, the grayscale value of each pixel in the image to be displayed by the display block is obtained, and the screen includes at least one display block.
  • a display block can be set in the screen of the terminal, or multiple display blocks can be set. Among them, each one The display block corresponds to a set of backlights, and each set of backlights is used to individually control the backlight brightness of the display block corresponding thereto.
  • the one display block is usually used to display a complete image.
  • this embodiment does not limit other possible implementations.
  • the one display block can also be used to display a portion of a complete image; alternatively, the one display block can also be used to display multiple complete images, and so on.
  • the plurality of display blocks are generally used to display a complete image, and each display block is used to display a part of a complete image.
  • this embodiment does not limit other possible implementations.
  • the plurality of display blocks can also be used to display a plurality of complete images, each of the display blocks for displaying a completed image, and the like.
  • the backlight brightness of the display block is controlled by using the backlight control method provided in this embodiment.
  • the terminal For each display block in the screen, acquires the grayscale value of each pixel in the image to be displayed by the display block.
  • the terminal may perform histogram statistics on the grayscale values of each pixel in the image, and count the number of pixels corresponding to each grayscale value.
  • the horizontal axis 31 represents the grayscale value
  • the vertical axis 32 represents the number of pixels.
  • the image to be displayed on the display block in the screen may be a picture or a video, which is not limited in this embodiment.
  • step 302 a minimum of the predetermined number of maximum grayscale values is obtained according to the grayscale value of each pixel.
  • the predetermined number is a preset experience value.
  • the predetermined number is set to 1.
  • the predetermined number is set to be greater than 1, such as 5, 10, 15, and the like.
  • the predetermined number should not be too large. The larger the predetermined number, the larger the contrast damage allowed when performing CABC processing on the image, which is detrimental to the image display quality and display effect.
  • this step acquires the maximum value of the grayscale value of each pixel in the image. For example, in the case where the grayscale values of the pixels in the image are 255, 255, 255, 254, 254, 252, 252, etc., when the predetermined number is 1, the grayscale value obtained in this step is Is 255.
  • the predetermined number is greater than 1, the predetermined number is 5, and the grayscale values of the pixels in the image are 255, 255, 255, 254, 254, 252, 252, etc., as exemplified by this step.
  • the grayscale value is 254.
  • step 303 when the minimum value reaches the grayscale value threshold, the grayscale value of each pixel is controlled to remain unchanged, and the backlight brightness of the display block is controlled to maintain the maximum backlight brightness.
  • the grayscale value threshold is a preset empirical value.
  • the size of the grayscale value threshold is related to the screen. For example, when the screen is an 8-bit panel, the grayscale value interval that the screen can display is 0 to 255, and the grayscale value threshold can be set to a value close to the maximum grayscale value of 255, such as 250. For example, when the screen is a 10-bit panel, the grayscale value interval that the screen can display is 0 to 1023, and the grayscale value threshold can be set to a value such as 1000 that is close to the maximum grayscale value 1023.
  • the PWM signal with a duty ratio of 100% is used to instruct the backlight driving IC to control the backlight brightness of the display block to maintain the maximum backlight brightness.
  • the terminal when the minimum value does not reach the grayscale value threshold, the terminal performs CABC processing on the image to save backlight power consumption.
  • the terminal may perform the following steps 304 to 306:
  • step 304 when the minimum value does not reach the grayscale value threshold, the grayscale value subinterval in which the minimum value is located is obtained.
  • the terminal may divide the grayscale value interval [0, P max ] corresponding to the screen into M gray scale value subintervals, and the gray scale value subinterval with the largest gray scale value in the M gray scale value subintervals is [P 0 , P max ].
  • P 0 is the gray scale value threshold
  • P max is the maximum gray scale value that the screen can display
  • M is an integer.
  • the dividing process may include the following steps:
  • the grayscale value interval [0, Pmax ] corresponding to the screen refers to the interval formed by the minimum grayscale value that the screen can display and the maximum grayscale value that the screen can display. For example, when the screen is an 8-bit panel, the corresponding grayscale value interval of the screen is [0, 255]. For another example, when the screen is a 10-bit panel, the corresponding grayscale value interval of the screen is [0, 1023].
  • the division manner may be an equal division method or a non-equal division method.
  • the gray-scale value interval [0, P max ] is divided into M gray-scale value sub-intervals by an equal division method, and the maximum gray-scale value and the minimum gray corresponding to each gray-scale value sub-interval The difference between the order values is equal.
  • the grayscale value interval [0, 255] is equally divided into 32 grayscale value subintervals, and the 32 grayscale value subintervals are sequentially [0, 7], [8, 15], ..., [8i, 8i +7],...,[240,247], [248,255].
  • the gray-scale value interval [0, P max ] is divided into M gray-scale value sub-intervals by using a non-equal division method.
  • the gray-scale value sub-interval distribution of the low-order part is appropriately dense, and the gray-scale value sub-interval distribution of the middle-high-order part is appropriately sparse, because the lower-order part adjusts the gray-scale more. sensitive.
  • the gray-scale value interval [0, 255] is divided into 30 gray-scale value sub-intervals, and the 30 gray-scale value sub-intervals are sequentially [0, 5], [6, 11], ..., [130, 138] ,...,[245,255].
  • a corresponding duty ratio is set in advance for each grayscale value subinterval.
  • the magnitude of the duty cycle is positively correlated with the magnitude of the grayscale value, and the magnitude of the duty cycle is positively correlated with the brightness of the backlight.
  • the gray scale value subinterval [P 0 , P max ] having the largest gray scale value corresponds to a duty ratio of 100%.
  • the grayscale value interval [0, 255] is divided into 30 grayscale value subintervals, and the grayscale values of the 30 grayscale value subintervals are sequentially increased, and the duty ratio corresponding to the first grayscale value subinterval is sequentially increased.
  • the duty ratio corresponding to the 30th grayscale value subinterval is 100%, and the duty ratio corresponding to each grayscale value subinterval increases sequentially as the sequence number increases.
  • the terminal After acquiring the minimum value of the predetermined number of maximum grayscale values according to the grayscale value of each pixel, the terminal acquires the grayscale value subinterval in which the minimum value is located.
  • the grayscale value subinterval of the minimum value is the grayscale value subinterval [P 0 , P max ] with the largest grayscale value, it means that the minimum value reaches the grayscale value threshold.
  • the grayscale value subinterval at which the minimum value is located is not [P 0 , P max ], it means that the minimum value does not reach the grayscale value threshold.
  • a schematic diagram 33 of a grayscale value distribution is shown.
  • the horizontal axis 34 represents the serial number of the grayscale value subinterval, and the grayscale value increases sequentially with the increase of the serial number; the vertical axis 35 represents the number of pixels.
  • the gray-scale value interval [0, 255] into 30 gray-scale value sub-intervals as an example, when the minimum value is 255, it can be determined that the gray-scale value sub-interval is the 30th gray-scale value sub-interval (For example, the 30th grayscale value subinterval is [245, 255]).
  • a schematic diagram 36 of another grayscale value distribution is shown. When the minimum value is 187, it can be determined that the grayscale value subinterval in which it is located is the 22nd grayscale value subinterval (for example, the 22nd grayscale value subinterval is [182, 190]).
  • step 305 the duty ratio corresponding to the grayscale value subinterval is acquired according to the preset correspondence.
  • the preset correspondence relationship includes a correspondence between different grayscale value subintervals and different duty ratios, and the preset correspondence relationship is a correspondence relationship that is preset and saved through the foregoing step 3.
  • the duty ratio corresponding to the 30th grayscale value subinterval [245, 255] is 100%.
  • the duty ratio corresponding to the 22nd grayscale value subinterval [182, 190] is 80%.
  • step 306 a PWM signal having the above duty ratio is transmitted to the backlight driving IC, and the PWM signal is used to instruct the backlight driving IC to control the backlight brightness of the display block according to the duty ratio.
  • the size of the duty cycle is positively correlated with the brightness of the backlight. For example, when a PWM signal with a duty ratio of 100% is sent to the backlight driving IC, the PWM signal with a duty ratio of 100% is used to instruct the backlight driving IC to control the backlight brightness of the display block to maintain the maximum backlight brightness. For another example, when a PWM signal with a duty ratio of 80% is sent to the backlight driving IC, the PWM signal with a duty ratio of 80% is used to indicate that the backlight brightness of the backlight driving IC control display block becomes the maximum backlight brightness. %.
  • the duty ratio of the PWM signal when the duty ratio of the PWM signal is 100%, the grayscale value of the terminal control image remains unchanged.
  • the duty ratio of the PWM signal is less than 100%, the terminal increases the grayscale value of the image, so that the increase of the grayscale value of the image and the weakening of the backlight luminance are balanced, so that the brightness presented by the image is substantially consistent before and after the processing.
  • the image processing is processed by using CABC technology, and the effect of saving backlight power consumption can be achieved; when the terminal needs to display the image, When there are pixels with high grayscale values (such as white pixels), the image processing is not processed by CABC technology, which ensures image contrast and display effect.
  • a PWM signal with a duty ratio of 100% is output to instruct the backlight driving IC to control the backlight brightness to maintain the maximum backlight. Brightness, completely avoiding contrast damage.
  • the terminal does not need to compare the minimum value with the grayscale value threshold, and the terminal may directly perform the above step 304. Obtaining a grayscale value subinterval in which the minimum value is located, and further determining whether to perform CABC processing on the image according to the duty ratio corresponding to the obtained grayscale value subinterval.
  • the backlight control method obtains a grayscale value of each pixel in an image to be displayed in a display block, and then obtains a predetermined number of maximum grayscale values according to grayscale values of each pixel. Minimum value, and when the minimum value reaches the grayscale value threshold, the grayscale value of each pixel is controlled to remain unchanged, and the backlight brightness of the display block is controlled to maintain the maximum backlight brightness, that is, not in the display block.
  • the image is processed by CABC; when the pixel with high grayscale value in the image is solved, processing the image by CABC technology will result in a significant decrease in image contrast, which seriously affects the image display effect; When the pixels of the grayscale value are not subjected to CABC processing, the image contrast damage is avoided or reduced, and the image quality and display effect are improved.
  • the backlight control method provided in this embodiment uses the CABC technology to process an image when there are no pixels of high gray scale values (such as white pixels) in the image; when there are pixels with high gray scale values in the image (such as white) In the case of pixels, the image is not processed using CABC technology.
  • the above dynamic control method can achieve the effect of saving backlight power consumption, and ensures image contrast and display effect.
  • the backlight control method provided by the embodiment further divides the grayscale value interval that can be displayed on the screen into a plurality of grayscale value subintervals, and sets a corresponding PWM signal duty ratio for each grayscale value subinterval. It can simplify the calculation and processing flow and improve the efficiency of backlight control.
  • FIG. 4 is a block diagram of a backlight control apparatus that can be implemented as part or all of a terminal by software, hardware, or a combination of both, according to an exemplary embodiment.
  • the backlight control device may include a first acquisition module 410, a second acquisition module 420, and a control module 430.
  • the first obtaining module 410 is configured to acquire, for each display block in the screen, a grayscale value of each pixel in the image to be displayed by the display block, where the screen includes at least one display block.
  • the second obtaining module 420 is configured to obtain a minimum value of the predetermined number of maximum grayscale values according to the grayscale values of the pixels.
  • the control module 430 is configured to control the grayscale value of the pixels to remain unchanged when the minimum value reaches the grayscale value threshold, and control the backlight brightness of the display block to maintain the maximum backlight brightness.
  • the backlight control apparatus obtains a grayscale value of each pixel in an image to be displayed in a display block, and then obtains a predetermined number of maximum grayscale values according to grayscale values of each pixel. Minimum value, and when the minimum value reaches the grayscale value threshold, the grayscale value of each pixel is controlled to remain unchanged, and the backlight brightness of the display block is controlled to maintain the maximum backlight brightness, that is, not in the display block.
  • the image is processed by CABC; when the pixel with high grayscale value in the image is solved, processing the image by CABC technology will result in a sharp decrease in image contrast. The problem of affecting the image display effect is realized; when the pixels with high gray scale values in the image are not processed, the image is not subjected to CABC processing, which avoids or reduces image contrast damage, and improves image quality and display effect.
  • FIG. 5 is a block diagram of a backlight control apparatus that may be implemented as part or all of a terminal by software, hardware, or a combination of both, according to another exemplary embodiment.
  • the backlight control device may include a first acquisition module 410, a second acquisition module 420, and a control module 430.
  • the first obtaining module 410 is configured to acquire, for each display block in the screen, a grayscale value of each pixel in the image to be displayed by the display block, where the screen includes at least one display block.
  • the second obtaining module 420 is configured to obtain a minimum value of the predetermined number of maximum grayscale values according to the grayscale values of the pixels.
  • the control module 430 is configured to control the grayscale value of the pixels to remain unchanged when the minimum value reaches the grayscale value threshold, and control the backlight brightness of the display block to maintain the maximum backlight brightness.
  • control module 430 includes: a sending submodule and a control submodule (not shown).
  • the transmitting submodule is configured to send a PWM signal with a duty ratio of 100% to the backlight driving IC, and the PWM signal with a duty ratio of 100% is used to instruct the backlight driving IC to control the display block.
  • the backlight brightness maintains maximum backlight brightness.
  • the control submodule is configured to control the grayscale value of each pixel to remain unchanged.
  • the device further includes: a third obtaining module 422, a fourth obtaining module 424, and a sending module 426.
  • the third obtaining module 422 is configured to acquire a grayscale value subinterval in which the minimum value is located when the minimum value does not reach the grayscale value threshold.
  • the fourth obtaining module 424 is configured to acquire a duty ratio corresponding to the grayscale value subinterval according to the preset correspondence, where the preset correspondence includes different grayscale value subintervals and different duty ratios.
  • the magnitude of the duty ratio is positively correlated with the magnitude of the grayscale value
  • the magnitude of the duty cycle is positively correlated with the brightness of the backlight
  • the grayscale value subinterval of the grayscale value is the largest [P 0
  • the duty ratio corresponding to P max ] is 100%
  • P 0 is the gray scale value threshold
  • P max is the maximum gray scale value that the screen can display, 0 ⁇ P 0 ⁇ P max .
  • the transmitting module 426 is configured to send a PWM signal having the duty ratio to the backlight driving IC, the PWM signal being used to instruct the backlight driving IC to control the backlight brightness of the display block according to the duty ratio.
  • the device further includes: a fifth obtaining module 402, a dividing module 404, and a first setting module 406.
  • the fifth obtaining module 402 is configured to acquire a grayscale value interval [0, P max ] corresponding to the screen.
  • the dividing module 404 is configured to divide the grayscale value interval [0, Pmax ] into M grayscale value subintervals, M ⁇ 2 and M is an integer.
  • the first setting module 406 is configured to respectively set a corresponding duty ratio for each grayscale value subinterval, and save a correspondence between the grayscale value subinterval and the duty ratio.
  • the dividing module 404 includes: a first dividing submodule 404a; or a second dividing submodule 404b.
  • the first dividing sub-module 404a is configured to divide the gray-scale value interval [0, P max ] into the M gray-scale value sub-intervals by using an equal division manner, and the maximum gray-scale corresponding to each gray-scale value sub-interval The difference between the value and the minimum grayscale value is equal.
  • the second dividing sub-module 404b is configured to divide the gray-scale value interval [0, P max ] into the M gray-scale value sub-intervals, and the i+1th gray-scale value sub-intervals by using a non-equal division method [
  • the difference P (i+1)max - P (i+1)min between the maximum grayscale value and the minimum grayscale value corresponding to P (i+1)min , P (i+1)max ] is greater than or equal to
  • the difference between the maximum gray scale value corresponding to the i-th gray scale value subinterval [P (i)min , P (i)max ] and the minimum gray scale value P (i)max -P (i)min , P (i+1)min P (i) max +1, 1 ⁇ i ⁇ M-1 and i is an integer.
  • the device further includes: a second setting module 408.
  • the second setting module 408 is configured to set the predetermined number to be 1 when the contrast-lossless content of the image corresponds to the backlight control CABC processing.
  • the backlight control apparatus obtains a grayscale value of each pixel in an image to be displayed in a display block, and then obtains a predetermined number of maximum grayscale values according to grayscale values of each pixel. Minimum value, and when the minimum value reaches the grayscale value threshold, the grayscale value of each pixel is controlled to remain unchanged, and the backlight brightness of the display block is controlled to maintain the maximum backlight brightness, that is, not in the display block.
  • the image is processed by CABC; when the pixel with high grayscale value in the image is solved, processing the image by CABC technology will result in a significant decrease in image contrast, which seriously affects the image display effect; When the pixels of the grayscale value are not subjected to CABC processing, the image contrast damage is avoided or reduced, and the image quality and display effect are improved.
  • the backlight control apparatus processes the image by using CABC technology when there are no pixels of high gray scale value (such as white pixels) in the image; when there are pixels of high gray scale value in the image (such as white) In the case of pixels, the image is not processed using CABC technology.
  • the above dynamic control method can achieve the effect of saving backlight power consumption, and ensures image contrast and display effect.
  • the backlight control apparatus provided in this embodiment further divides the grayscale value interval that can be displayed on the screen into a plurality of grayscale value subintervals, and sets a corresponding PWM signal duty ratio for each grayscale value subinterval. It can simplify the calculation and processing flow and improve the efficiency of backlight control.
  • FIG. 6 is a block diagram of an apparatus 600 for controlling a backlight, according to an exemplary embodiment.
  • device 600 can be a mobile phone, a computer, a digital broadcast terminal, a messaging device, a gaming console, a tablet device, a medical device, a fitness device, a personal digital assistant, and the like.
  • device 600 can include one or more of the following components: processing component 602, memory 604, power component 606, multimedia component 608, audio component 610, input/output (I/O) interface 612, sensor component 614, And a communication component 616.
  • processing component 602 memory 604, power component 606, multimedia component 608, audio component 610, input/output (I/O) interface 612, sensor component 614, And a communication component 616.
  • Processing component 602 typically controls the overall operation of device 600, such as operations associated with display, telephone calls, data communications, camera operations, and recording operations.
  • Processing component 602 can include one or more processors 620 to execute instructions to perform all or part of the steps of the above described methods.
  • processing component 602 can include one or more modules to facilitate interaction between component 602 and other components.
  • processing component 602 can include a multimedia module to The interaction between the multimedia component 608 and the processing component 602 is facilitated.
  • Memory 604 is configured to store various types of data to support operation at device 600. Examples of such data include instructions for any application or method operating on device 600, contact data, phone book data, messages, pictures, videos, and the like.
  • the memory 604 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read only memory (EEPROM), erasable Programmable Read Only Memory (EPROM), Programmable Read Only Memory (PROM), Read Only Memory (ROM), Magnetic Memory, Flash Memory, Disk or Optical Disk.
  • SRAM static random access memory
  • EEPROM electrically erasable programmable read only memory
  • EPROM erasable Programmable Read Only Memory
  • PROM Programmable Read Only Memory
  • ROM Read Only Memory
  • Magnetic Memory Flash Memory
  • Disk Disk or Optical Disk.
  • Power component 606 provides power to various components of device 600.
  • Power component 606 can include a power management system, one or more power sources, and other components associated with generating, managing, and distributing power for device 600.
  • the multimedia component 608 includes a screen between the device 600 and the user that provides an output interface.
  • the screen can include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen can be implemented as a touch screen to receive input signals from the user.
  • the touch panel includes one or more touch sensors to sense touches, slides, and gestures on the touch panel. The touch sensor may sense not only the boundary of the touch or sliding action, but also the duration and pressure associated with the touch or slide operation.
  • the multimedia component 608 includes a front camera and/or a rear camera. When the device 600 is in an operation mode, such as a shooting mode or a video mode, the front camera and/or the rear camera can receive external multimedia data. Each front and rear camera can be a fixed optical lens system or have focal length and optical zoom capabilities.
  • the audio component 610 is configured to output and/or input an audio signal.
  • audio component 610 includes a microphone (MIC) that is configured to receive an external audio signal when device 600 is in an operational mode, such as a call mode, a recording mode, and a voice recognition mode.
  • the received audio signal may be further stored in memory 604 or transmitted via communication component 616.
  • audio component 610 also includes a speaker for outputting an audio signal.
  • the I/O interface 612 provides an interface between the processing component 602 and the peripheral interface module, which may be a keyboard, a click wheel, a button, or the like. These buttons may include, but are not limited to, a home button, a volume button, a start button, and a lock button.
  • Sensor assembly 614 includes one or more sensors for providing device 600 with a status assessment of various aspects.
  • sensor assembly 614 can detect an open/closed state of device 600, a relative positioning of components, such as the display and keypad of device 600, and sensor component 614 can also detect a change in position of one component of device 600 or device 600. The presence or absence of contact by the user with the device 600, the orientation or acceleration/deceleration of the device 600 and the temperature change of the device 600.
  • Sensor assembly 614 can include a proximity sensor configured to detect the presence of nearby objects without any physical contact.
  • Sensor assembly 614 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications.
  • the sensor component 614 can also include an acceleration sensor, a gyro sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.
  • Communication component 616 is configured to facilitate wired or wireless communication between device 600 and other devices.
  • the device 600 can access a wireless network based on a communication standard, such as WiFi, 2G or 3G, or a combination thereof.
  • communication component 616 receives broadcast signals or broadcast associated information from an external broadcast management system via a broadcast channel.
  • the communication component 616 also includes a near field communication (NFC) module to facilitate short range communication.
  • NFC near field communication
  • the NFC module can be implemented based on radio frequency identification (RFID) technology, infrared data association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT) technology, and other technologies.
  • RFID radio frequency identification
  • IrDA infrared data association
  • UWB ultra-wideband
  • Bluetooth Bluetooth
  • device 600 may be implemented by one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable A gate array (FPGA), controller, microcontroller, microprocessor, or other electronic component implementation for performing the above methods.
  • ASICs application specific integrated circuits
  • DSPs digital signal processors
  • DSPDs digital signal processing devices
  • PLDs programmable logic devices
  • FPGA field programmable A gate array
  • controller microcontroller, microprocessor, or other electronic component implementation for performing the above methods.
  • non-transitory computer readable storage medium comprising instructions, such as a memory 604 comprising instructions executable by processor 620 of apparatus 600 to perform the above method.
  • the non-transitory computer readable storage medium may be a ROM, a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, and an optical data storage device.
  • a non-transitory computer readable storage medium that, when executed by a processor of apparatus 600, enables apparatus 600 to perform the backlight control method illustrated in FIG. 2 or FIG. 3A above.

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Abstract

一种背光控制方法和装置，属于屏幕显示技术领域。背光控制方法包括：对于屏幕中的每一个显示区块，获取显示区块所需显示的图像中各像素的灰阶值，屏幕中包含至少一个显示区块（202）；根据各像素的灰阶值获取预定数量的最大灰阶值中的最小值（204）；当最小值达到灰阶值阈值时，控制各像素的灰阶值保持不变，并控制显示区块的背光亮度保持最大背光亮度（206）。背光控制方法和装置解决了当图像中有高灰阶值的像素时，采用CABC技术对图像进行处理会导致图像对比度大幅降低，严重影响图像显示效果的问题；实现了当图像中有高灰阶值的像素时不对图像进行CABC处理，避免或减轻了图像对比度损伤，提高了图像质量和显示效果。

Description

背光控制方法和装置
本申请要求于2015年1月8日提交中国专利局、申请号为201510009475.1的中国专利申请的优先权，以及2014年12月31日提交中国专利局、申请号为201410856892.5的中国专利申请的优先权，以上全部内容通过引用结合在本申请中。
技术领域
本公开涉及屏幕显示技术领域，特别涉及一种背光控制方法和装置。
背景技术
内容对应背光控制(英文：Content Adaptive Brightness Control；简称：CABC)技术是一种用于具有液晶显示(英文：Liquid Crystal Display；简称：LCD)屏幕的终端中的背光省电技术。
CABC技术可以根据屏幕显示的图像来调整该图像的灰阶值与屏幕背光亮度之间的关系，在有效降低屏幕背光亮度的同时，基本保持图像的显示效果。比如，将图像的灰阶值提高30％使得图像变亮，并将LCD屏幕的背光亮度降低30％使得图像变暗，这样就可以使得图像所呈现的亮度在处理前后基本保持一致，但减少了30％的背光功耗。
然而，当图像中有高灰阶值的像素(如白色像素)时，若采用CABC技术对该图像进行处理，则这部分高灰阶值的像素的灰阶值已无法提高，而其它低灰阶值的像素(如黑色像素)的灰阶值可以提高，就会导致图像对比度大幅降低，严重影响图像显示效果。
发明内容
为了解决当图像中有高灰阶值的像素时，采用CABC技术对该图像进行处理会导致图像对比度大幅降低，严重影响图像显示效果的问题，本公开实施例提供了一种背光控制方法和装置。所述技术方案如下：
根据本公开实施例的第一方面，提供了一种背光控制方法，所述方法包括：
对于屏幕中的每一个显示区块，获取所述显示区块所需显示的图像中各像素的灰阶值，所述屏幕中包含至少一个显示区块；
根据所述各像素的灰阶值获取预定数量的最大灰阶值中的最小值；
当所述最小值达到灰阶值阈值时，控制所述各像素的灰阶值保持不变，并控制所述显示区块的背光亮度保持最大背光亮度。
可选的，所述方法还包括：
当所述最小值未达到所述灰阶值阈值时，获取所述最小值所处的灰阶值子区间；
根据预设对应关系获取与所述灰阶值子区间对应的占空比，所述预设对应关系包括不同的灰阶值子区间与不同的占空比之间的对应关系，所述占空比的大小与灰阶值的大小呈 正相关关系，所述占空比的大小与背光亮度呈正相关关系，且灰阶值最大的灰阶值子区间[P0，Pmax]对应的占空比为100％，P0为所述灰阶值阈值，Pmax为所述屏幕所能显示的最大灰阶值，0＜P0≤Pmax；
向背光驱动IC发送具有所述占空比的脉冲宽度调制(英文：Pulse Width Modulation；简称：PWM)信号，所述PWM信号用于指示所述背光驱动IC根据所述占空比控制所述显示区块的背光亮度。
可选的，所述方法还包括：
获取与所述屏幕对应的灰阶值区间[0，Pmax]；
将所述灰阶值区间[0，Pmax]分成M个灰阶值子区间，M≥2且M为整数；
分别为每一个灰阶值子区间设置对应的占空比，并保存所述灰阶值子区间与所述占空比之间的对应关系。
可选的，所述将所述灰阶值区间[0，Pmax]分成M个灰阶值子区间，包括：
采用等分方式将所述灰阶值区间[0，Pmax]分成所述M个灰阶值子区间，每个灰阶值子区间对应的最大灰阶值与最小灰阶值之间的差值相等；
或者，
采用非等分方式将所述灰阶值区间[0，Pmax]分成所述M个灰阶值子区间，第i+1个灰阶值子区间[P(i+1)min，P(i+1)max]对应的最大灰阶值与最小灰阶值之间的差值P(i+1)max-P(i+1)min大于或者等于第i个灰阶值子区间[P(i)min，P(i)max]对应的最大灰阶值与最小灰阶值之间的差值P(i)max-P(i)min，P(i+1)min＝P(i)max+1，1≤i≤M-1且i为整数。
可选的，所述方法还包括：
当对所述图像进行对比度无损的内容对应背光控制CABC处理时，设置所述预定数量为1。
根据本公开实施例的第二方面，提供了一种背光控制装置，所述装置包括：
第一获取模块，被配置为对于屏幕中的每一个显示区块，获取所述显示区块所需显示的图像中各像素的灰阶值，所述屏幕中包含至少一个显示区块；
第二获取模块，被配置为根据所述各像素的灰阶值获取预定数量的最大灰阶值中的最小值；
控制模块，被配置为当所述最小值达到灰阶值阈值时，控制所述各像素的灰阶值保持不变，并控制所述显示区块的背光亮度保持最大背光亮度。
可选的，所述装置还包括：
第三获取模块，被配置为当所述最小值未达到所述灰阶值阈值时，获取所述最小值所处的灰阶值子区间；
第四获取模块，被配置为根据预设对应关系获取与所述灰阶值子区间对应的占空比，所述预设对应关系包括不同的灰阶值子区间与不同的占空比之间的对应关系，所述占空比的大小与灰阶值的大小呈正相关关系，所述占空比的大小与背光亮度呈正相关关系，且灰 阶值最大的灰阶值子区间[P0，Pmax]对应的占空比为100％，P0为所述灰阶值阈值，Pmax为所述屏幕所能显示的最大灰阶值，0＜P0≤Pmax；
发送模块，被配置为向背光驱动IC发送具有所述占空比的PWM信号，所述PWM信号用于指示所述背光驱动IC根据所述占空比控制所述显示区块的背光亮度。
可选的，所述装置还包括：
第五获取模块，被配置为获取与所述屏幕对应的灰阶值区间[0，Pmax]；
划分模块，被配置为将所述灰阶值区间[0，Pmax]分成M个灰阶值子区间，M≥2且M为整数；
第一设置模块，被配置为分别为每一个灰阶值子区间设置对应的占空比，并保存所述灰阶值子区间与所述占空比之间的对应关系。
可选的，所述划分模块，包括：
第一划分子模块，被配置为采用等分方式将所述灰阶值区间[0，Pmax]分成所述M个灰阶值子区间，每个灰阶值子区间对应的最大灰阶值与最小灰阶值之间的差值相等；
或者，
第二划分子模块，被配置为采用非等分方式将所述灰阶值区间[0，Pmax]分成所述M个灰阶值子区间，第i+1个灰阶值子区间[P(i+1)min，P(i+1)max]对应的最大灰阶值与最小灰阶值之间的差值P(i+1)max-P(i+1)min大于或者等于第i个灰阶值子区间[P(i)min，P(i)max]对应的最大灰阶值与最小灰阶值之间的差值P(i)max-P(i)min，P(i+1)min＝P(i)max+1，1≤i≤M-1且i为整数。
可选的，所述装置还包括：
第二设置模块，被配置为当对所述图像进行对比度无损的内容对应背光控制CABC处理时，设置所述预定数量为1。
根据本公开实施例的第三方面，提供了一种背光控制装置，包括：
处理器；
用于存储所述处理器的可执行指令的存储器；
其中，所述处理器被配置为：
对于屏幕中的每一个显示区块，获取所述显示区块所需显示的图像中各像素的灰阶值，所述屏幕中包含至少一个显示区块；
根据所述各像素的灰阶值获取预定数量的最大灰阶值中的最小值；
当所述最小值达到灰阶值阈值时，控制所述各像素的灰阶值保持不变，并控制所述显示区块的背光亮度保持最大背光亮度。
本公开实施例提供的技术方案可以包括以下有益效果：
通过获取显示区块所需显示的图像中各像素的灰阶值，然后根据各像素的灰阶值获取预定数量的最大灰阶值中的最小值，并当该最小值达到灰阶值阈值的情况下，控制各像素的灰阶值保持不变，并控制该显示区块的背光亮度保持最大背光亮度，也即不对该显示区块中的图像进行CABC处理；解决了当图像中有高灰阶值的像素时，采用CABC技术对 该图像进行处理会导致图像对比度大幅降低，严重影响图像显示效果的问题；实现了当图像中有高灰阶值的像素时不对图像进行CABC处理，避免或减轻了图像对比度损伤，提高了图像质量和显示效果。
应当理解的是，以上的一般描述和后文的细节描述仅是示例性和解释性的，并不能限制本公开。
附图说明
此处的附图被并入说明书中并构成本说明书的一部分，示出了符合本公开的实施例，并与说明书一起用于解释本公开的原理。
图1是一种采用CABC技术实现背光省电控制的终端的结构示意图；
图2是根据一示例性实施例示出的一种背光控制方法的流程图；
图3A是根据另一示例性实施例示出的一种背光控制方法的流程图；
图3B是根据另一示例性实施例示出的一种直方图的示意图；
图3C是根据另一示例性实施例示出的一种灰阶值分布的示意图；
图3D是根据另一示例性实施例示出的另一种灰阶值分布的示意图；
图4是根据一示例性实施例示出的一种背光控制装置的框图；
图5是根据另一示例性实施例示出的一种背光控制装置的框图；
图6是根据一示例性实施例示出的一种装置的框图。
通过上述附图，已示出本公开明确的实施例，后文中将有更详细的描述。这些附图和文字描述并不是为了通过任何方式限制本公开构思的范围，而是通过参考特定实施例为本领域技术人员说明本公开的概念。
具体实施方式
这里将详细地对示例性实施例进行说明，其示例表示在附图中。下面的描述涉及附图时，除非另有表示，不同附图中的相同数字表示相同或相似的要素。以下示例性实施例中所描述的实施方式并不代表与本公开相一致的所有实施方式。相反，它们仅是与如所附权利要求书中所详述的、本公开的一些方面相一致的装置和方法的例子。
首先需要说明的一点是：在本公开各个实施例中，所涉及的终端具有LCD屏幕，该LCD屏幕可以是冷阴极荧光灯管(英文：Cold Cathode Fluorescent Lamp；简称：CCFC)屏幕或者发光二极管(英文：Light Emitting Diode；简称：LED)屏幕。终端可以是手机、平板电脑、电子书阅读器、动态影像专家压缩标准音频层面3(英文：Moving Picture Experts Group Audio Layer III；简称：MP3)播放器、动态影像专家压缩标准音频层面4(英文：Moving Picture Experts Group Audio Layer IV；简称：MP4)播放器、膝上型便携计算机和台式计算机等等。
另外，结合参考图1，其示出了一种采用CABC技术实现背光省电控制的终端的结构 示意图。该终端可以是如上例举的任一具有LCD屏幕的终端。该终端10包括：LCD屏幕110、屏幕驱动集成电路(英文：Integrated Circuit；简称：IC)120、背光驱动IC130、背光源140和中央处理器(英文：Central Processing Unit；简称：CPU)150。
如图1所示，CPU150与屏幕驱动IC120之间电性相连，CPU150用于将需要显示的图像传送至屏幕驱动IC120。屏幕驱动IC120与LCD屏幕110之间电性相连，屏幕驱动IC120用于控制LCD屏幕110显示图像。背光驱动IC130与CPU150和/或屏幕驱动IC120之间电性相连，背光驱动IC130用于接收CPU150和/或屏幕驱动IC120发送的PWM信号，并根据该PWM信号控制背光源140的背光亮度。
本公开实施例提供的背光控制方法，可以由上述图1的CPU150单独执行，也可以由屏幕驱动IC120单独执行，或者由CPU150和屏幕驱动IC120配合执行。相应的，本公开实施例提供的背光控制装置，可以全部集成于CPU150中，也可以全部集成于屏幕驱动IC120中，或者不同的功能模块分置于CPU150和屏幕驱动IC120中。下面，通过几个实施例对本公开提供的技术方案进行介绍和说明。
图2是根据一示例性实施例示出的一种背光控制方法的流程图，本实施例以该背光控制方法应用于图1所示终端中进行举例说明。该背光控制方法可以包括如下几个步骤：
在步骤202中，对于屏幕中的每一个显示区块，获取该显示区块所需显示的图像中各像素的灰阶值，上述屏幕中包含至少一个显示区块。
在步骤204中，根据各像素的灰阶值获取预定数量的最大灰阶值中的最小值。
在步骤206中，当该最小值达到灰阶值阈值时，控制各像素的灰阶值保持不变，并控制该显示区块的背光亮度保持最大背光亮度。
综上所述，本实施例提供的背光控制方法，通过获取显示区块所需显示的图像中各像素的灰阶值，然后根据各像素的灰阶值获取预定数量的最大灰阶值中的最小值，并当该最小值达到灰阶值阈值的情况下，控制各像素的灰阶值保持不变，并控制该显示区块的背光亮度保持最大背光亮度，也即不对该显示区块中的图像进行CABC处理；解决了当图像中有高灰阶值的像素时，采用CABC技术对该图像进行处理会导致图像对比度大幅降低，严重影响图像显示效果的问题；实现了当图像中有高灰阶值的像素时不对图像进行CABC处理，避免或减轻了图像对比度损伤，提高了图像质量和显示效果。
图3A是根据另一示例性实施例示出的一种背光控制方法的流程图，本实施例以该背光控制方法应用于图1所示终端中进行举例说明。该背光控制方法可以包括如下几个步骤：
在步骤301中，对于屏幕中的每一个显示区块，获取该显示区块所需显示的图像中各像素的灰阶值，上述屏幕中包含至少一个显示区块。
终端的屏幕中可设置有一个显示区块，也可以设置有多个显示区块。其中，每一个显 示区块对应于一组背光源，每一组背光源用于单独控制与其对应的显示区块的背光亮度。
当终端的屏幕中设置有一个显示区块时，该一个显示区块通常用于显示一幅完整图像。当然，本实施例并不限定其它可能的实施方式。比如，该一个显示区块也可用于显示一幅完整图像中的部分；或者，该一个显示区块也可用于显示多幅完整图像，等等。
当终端的屏幕中设置有多个显示区块时，该多个显示区块通常用于显示一幅完整图像，且每一个显示区块用于显示一幅完整图像中的部分。当然，本实施例并不限定其它可能的实施方式。比如，该多个显示区块也可用于显示多幅完整图像，每一个或多个显示区块用于显示一幅完成图像，等等。当终端的屏幕中设置有多个显示区块时，对于每一个显示区块，分别采用本实施例提供的背光控制方法对该显示区块的背光亮度进行控制。
对于屏幕中的每一个显示区块，终端获取该显示区块所需显示的图像中各像素的灰阶值。在一种可能的实施方式中，终端可对图像中各像素的灰阶值进行直方图统计，统计每个灰阶值对应的像素数量。如图3B所示，在直方图30中，横轴31表示灰阶值，纵轴32表示像素数量。
另外，屏幕中的显示区块所需显示的图像可以是图片，也可以是视频，本实施例对此不作限定。
在步骤302中，根据各像素的灰阶值获取预定数量的最大灰阶值中的最小值。
其中，预定数量为预先设定的经验值。当对图像进行对比度无损的CABC处理时，设置预定数量为1。当对图像进行允许少量像素的对比度损伤的CABC处理时，设置预定数量大于1，如5、10、15等。但是，为了确保图像对比度和质量，预定数量不宜过大。预定数量越大，表示在对图像进行CABC处理时，所允许的对比度损伤越大，不利于图像显示质量和显示效果。
当预定数量为1时，本步骤即获取图像中各像素的灰阶值的最大值。比如，以图像中各像素的灰阶值由大到小依次为255、255、255、254、254、252、252……为例，当预定数量为1时，本步骤获取的灰阶值即为255。
当预定数量大于1时，以预定数量为5，且图像中各像素的灰阶值由大到小依次为255、255、255、254、254、252、252……为例，本步骤获取的灰阶值即为254。
在步骤303中，当该最小值达到灰阶值阈值时，控制各像素的灰阶值保持不变，并控制该显示区块的背光亮度保持最大背光亮度。
也即，当该最小值达到灰阶值阈值时，说明图像中存在一些高灰阶值的像素(如白色像素)，此时终端不对图像进行CABC处理，以确保图像对比度。其中，灰阶值阈值为预先设定的经验值。灰阶值阈值的大小与屏幕有关。比如，当屏幕为8bit面板时，屏幕所能显示的灰阶值区间为0至255，则灰阶值阈值可设定为250等接近于最大灰阶值255的数值。再比如，当屏幕为10bit面板时，屏幕所能显示的灰阶值区间为0至1023，则灰阶值阈值可设定为1000等接近于最大灰阶值1023的数值。
可选的，当该最小值达到灰阶值阈值时，向背光驱动IC发送占空比为100％的PWM 信号，该占空比为100％的PWM信号用于指示背光驱动IC控制显示区块的背光亮度保持最大背光亮度。
另外，当该最小值未达到灰阶值阈值时，终端对图像进行CABC处理，以节省背光功耗。在一种可能的实施方式中，终端可执行如下步骤304至步骤306：
在步骤304中，当该最小值未达到灰阶值阈值时，获取该最小值所处的灰阶值子区间。
终端可预先将屏幕对应的灰阶值区间[0，Pmax]划分为M个灰阶值子区间，该M个灰阶值子区间中灰阶值最大的灰阶值子区间为[P0，Pmax]。其中，P0为灰阶值阈值，Pmax为屏幕所能显示的最大灰阶值，0＜P0≤Pmax，M≥2且M为整数。
在一种可能的实施方式中，该划分过程可包括如下几个步骤：
1、获取与屏幕对应的灰阶值区间[0，Pmax]。
与屏幕对应的灰阶值区间[0，Pmax]是指屏幕所能显示的最小灰阶值与屏幕所能显示的最大灰阶值所构成的区间。比如，当屏幕为8bit面板时，该屏幕对应的灰阶值区间为[0，255]。再比如，当屏幕为10bit面板时，该屏幕对应的灰阶值区间为[0，1023]。
2、将灰阶值区间[0，Pmax]分成M个灰阶值子区间，M≥2且M为整数。
其中，划分方式可以是等分方式，也可以是非等分方式。
在第一种可能的实施方式中，采用等分方式将灰阶值区间[0，Pmax]分成M个灰阶值子区间，每个灰阶值子区间对应的最大灰阶值与最小灰阶值之间的差值相等。比如，将灰阶值区间[0，255]等分成32个灰阶值子区间，该32个灰阶值子区间依次为[0，7]、[8，15]、…、[8i，8i+7]、…、[240，247]、[248，255]。
在第二种可能的实施方式中，采用非等分方式将灰阶值区间[0，Pmax]分成M个灰阶值子区间。其中，第i+1个灰阶值子区间[P(i+1)min，P(i+1)max]对应的最大灰阶值与最小灰阶值之间的差值P(i+1)max-P(i+1)min大于或者等于第i个灰阶值子区间[P(i)min，P(i)max]对应的最大灰阶值与最小灰阶值之间的差值P(i)max-P(i)min，P(i+1)min＝P(i)max+1，1≤i≤M-1且i为整数。换句话说，当采用非等分方式时，低阶部分的灰阶值子区间分布适当密集，而中高阶部分的灰阶值子区间分布适当稀疏，原因在于低阶部分对灰阶调整更为敏感。比如，将灰阶值区间[0，255]分成30个灰阶值子区间，该30个灰阶值子区间依次为[0，5]、[6，11]、…、[130，138]、…、[245，255]。
3、分别为每一个灰阶值子区间设置对应的占空比，并保存灰阶值子区间与占空比之间的对应关系。
为了指导背光驱动IC对背光亮度进行控制，预先分别为每一个灰阶值子区间设置对应的占空比。其中，占空比的大小与灰阶值的大小呈正相关关系，且占空比的大小与背光亮度呈正相关关系。另外，灰阶值最大的灰阶值子区间[P0，Pmax]对应的占空比为100％。比如，将灰阶值区间[0，255]分成30个灰阶值子区间，该30个灰阶值子区间的灰阶值依次增大，第1个灰阶值子区间对应的占空比为40％，第30个灰阶值子区间对应的占空比为100％，且各个灰阶值子区间对应的占空比随序号增加而依次增加。
终端根据各像素的灰阶值获取预定数量的最大灰阶值中的最小值后，获取该最小值所处的灰阶值子区间。当该最小值所处的灰阶值子区间为上述灰阶值最大的灰阶值子区间[P0，Pmax]时，也即说明该最小值达到灰阶值阈值。当该最小值所处的灰阶值子区间不是[P0，Pmax]时，也即说明该最小值未达到灰阶值阈值。
如图3C所示，其示出了一种灰阶值分布的示意图33。其中，横轴34表示灰阶值子区间的序号，随着序号的增加灰阶值依次增大；纵轴35表示像素数量。以将灰阶值区间[0，255]分成30个灰阶值子区间为例，当上述最小值为255时，可确定其所处的灰阶值子区间为第30个灰阶值子区间(比如该第30个灰阶值子区间为[245，255])。如图3D所示，其示出了另一种灰阶值分布的示意图36。当上述最小值为187时，可确定其所处的灰阶值子区间为第22个灰阶值子区间(比如该第22个灰阶值子区间为[182，190])。
在步骤305中，根据预设对应关系获取与灰阶值子区间对应的占空比。
其中，预设对应关系包括不同的灰阶值子区间与不同的占空比之间的对应关系，该预设对应关系即为通过上述步骤3预先设置并保存的对应关系。比如，上述第30个灰阶值子区间[245，255]对应的占空比为100％。再比如，第22个灰阶值子区间[182，190]对应的占空比为80％。
在步骤306中，向背光驱动IC发送具有上述占空比的PWM信号，该PWM信号用于指示背光驱动IC根据该占空比控制上述显示区块的背光亮度。
占空比的大小与背光亮度呈正相关关系。比如，当向背光驱动IC发送占空比为100％的PWM信号时，该占空比为100％的PWM信号用于指示背光驱动IC控制显示区块的背光亮度保持最大背光亮度。再比如，当向背光驱动IC发送占空比为80％的PWM信号时，该占空比为80％的PWM信号用于指示背光驱动IC控制显示区块的背光亮度变为最大背光亮度的80％。
另外，当PWM信号的占空比为100％时，终端控制图像的灰阶值保持不变。当PWM信号的占空比小于100％时，终端增加图像的灰阶值，使得图像的灰阶值的增加与背光亮度的减弱达到平衡，使得图像所呈现的亮度在处理前后基本保持一致。这样，当终端所需显示的图像中不存在高灰阶值的像素(如白色像素)时，采用CABC技术对图像进行处理，可以达到节省背光功耗的效果；当终端所需显示的图像中存在高灰阶值的像素(如白色像素)时，不采用CABC技术对图像进行处理，保证了图像对比度和显示效果。
另外，当设置预定数量为1时，当图像中有一个高灰阶值的像素(如白色像素)时，即输出占空比为100％的PWM信号以指示背光驱动IC控制背光亮度保持最大背光亮度，完全避免了对比度损伤。
需要说明的一点是：终端在根据各像素的灰阶值获取预定数量的最大灰阶值中的最小值后，可不必将该最小值与灰阶值阈值进行比较，终端可直接执行上述步骤304以获取该最小值所处的灰阶值子区间，进而根据该获取的灰阶值子区间对应的占空比决策是否对图像进行CABC处理。
还需要说明的一点是：在实际应用中，对屏幕所能显示的灰阶值进行划分时，划分方式和划分数量可根据实际需求进行设定，上述例子进行示例性和解释性的。另外，在实际应用中，也可根据实际需求设定不同灰阶值子区间对应的占空比，上述举例仅是示例性和解释性的。
综上所述，本实施例提供的背光控制方法，通过获取显示区块所需显示的图像中各像素的灰阶值，然后根据各像素的灰阶值获取预定数量的最大灰阶值中的最小值，并当该最小值达到灰阶值阈值的情况下，控制各像素的灰阶值保持不变，并控制该显示区块的背光亮度保持最大背光亮度，也即不对该显示区块中的图像进行CABC处理；解决了当图像中有高灰阶值的像素时，采用CABC技术对该图像进行处理会导致图像对比度大幅降低，严重影响图像显示效果的问题；实现了当图像中有高灰阶值的像素时不对图像进行CABC处理，避免或减轻了图像对比度损伤，提高了图像质量和显示效果。
另外，本实施例提供的背光控制方法，当图像中不存在高灰阶值的像素(如白色像素)时，采用CABC技术对图像进行处理；当图像中存在高灰阶值的像素(如白色像素)时，不采用CABC技术对图像进行处理。上述动态控制的方式既可以达到节省背光功耗的效果，又保证了图像对比度和显示效果。
另外，本实施例提供的背光控制方法，还通过将屏幕所能显示的灰阶值区间划分为若干个灰阶值子区间，并为每一个灰阶值子区间设置对应的PWM信号占空比，可以简化计算和处理流程，提高背光控制效率。
下述为本公开装置实施例，可以用于执行本公开方法实施例。对于本公开装置实施例中未披露的细节，请参照本公开方法实施例。
图4是根据一示例性实施例示出的一种背光控制装置的框图，该背光控制装置可以通过软件、硬件或者两者的结合实现成为终端的部分或者全部。该背光控制装置可以包括：第一获取模块410、第二获取模块420和控制模块430。
第一获取模块410，被配置为对于屏幕中的每一个显示区块，获取所述显示区块所需显示的图像中各像素的灰阶值，所述屏幕中包含至少一个显示区块。
第二获取模块420，被配置为根据所述各像素的灰阶值获取预定数量的最大灰阶值中的最小值。
控制模块430，被配置为当所述最小值达到灰阶值阈值时，控制所述各像素的灰阶值保持不变，并控制所述显示区块的背光亮度保持最大背光亮度。
综上所述，本实施例提供的背光控制装置，通过获取显示区块所需显示的图像中各像素的灰阶值，然后根据各像素的灰阶值获取预定数量的最大灰阶值中的最小值，并当该最小值达到灰阶值阈值的情况下，控制各像素的灰阶值保持不变，并控制该显示区块的背光亮度保持最大背光亮度，也即不对该显示区块中的图像进行CABC处理；解决了当图像中有高灰阶值的像素时，采用CABC技术对该图像进行处理会导致图像对比度大幅降低，严 重影响图像显示效果的问题；实现了当图像中有高灰阶值的像素时不对图像进行CABC处理，避免或减轻了图像对比度损伤，提高了图像质量和显示效果。
图5是根据另一示例性实施例示出的一种背光控制装置的框图，该背光控制装置可以通过软件、硬件或者两者的结合实现成为终端的部分或者全部。该背光控制装置可以包括：第一获取模块410、第二获取模块420和控制模块430。
第一获取模块410，被配置为对于屏幕中的每一个显示区块，获取所述显示区块所需显示的图像中各像素的灰阶值，所述屏幕中包含至少一个显示区块。
第二获取模块420，被配置为根据所述各像素的灰阶值获取预定数量的最大灰阶值中的最小值。
控制模块430，被配置为当所述最小值达到灰阶值阈值时，控制所述各像素的灰阶值保持不变，并控制所述显示区块的背光亮度保持最大背光亮度。
可选的，控制模块430，包括：发送子模块和控制子模块(图中未示出)。
所述发送子模块，被配置为向背光驱动IC发送占空比为100％的PWM信号，所述占空比为100％的PWM信号用于指示所述背光驱动IC控制所述显示区块的背光亮度保持最大背光亮度。
所述控制子模块，被配置为控制所述各像素的灰阶值保持不变。
可选的，所述装置还包括：第三获取模块422、第四获取模块424和发送模块426。
第三获取模块422，被配置为当所述最小值未达到所述灰阶值阈值时，获取所述最小值所处的灰阶值子区间。
第四获取模块424，被配置为根据预设对应关系获取与所述灰阶值子区间对应的占空比，所述预设对应关系包括不同的灰阶值子区间与不同的占空比之间的对应关系，所述占空比的大小与灰阶值的大小呈正相关关系，所述占空比的大小与背光亮度呈正相关关系，且灰阶值最大的灰阶值子区间[P0，Pmax]对应的占空比为100％，P0为所述灰阶值阈值，Pmax为所述屏幕所能显示的最大灰阶值，0＜P0≤Pmax。
发送模块426，被配置为向背光驱动IC发送具有所述占空比的PWM信号，所述PWM信号用于指示所述背光驱动IC根据所述占空比控制所述显示区块的背光亮度。
可选的，所述装置还包括：第五获取模块402、划分模块404和第一设置模块406。
第五获取模块402，被配置为获取与所述屏幕对应的灰阶值区间[0，Pmax]。
划分模块404，被配置为将所述灰阶值区间[0，Pmax]分成M个灰阶值子区间，M≥2且M为整数。
第一设置模块406，被配置为分别为每一个灰阶值子区间设置对应的占空比，并保存所述灰阶值子区间与所述占空比之间的对应关系。
可选的，所述划分模块404，包括：第一划分子模块404a；或者，第二划分子模块404b。
第一划分子模块404a，被配置为采用等分方式将所述灰阶值区间[0，Pmax]分成所述M 个灰阶值子区间，每个灰阶值子区间对应的最大灰阶值与最小灰阶值之间的差值相等。
第二划分子模块404b，被配置为采用非等分方式将所述灰阶值区间[0，Pmax]分成所述M个灰阶值子区间，第i+1个灰阶值子区间[P(i+1)min，P(i+1)max]对应的最大灰阶值与最小灰阶值之间的差值P(i+1)max-P(i+1)min大于或者等于第i个灰阶值子区间[P(i)min，P(i)max]对应的最大灰阶值与最小灰阶值之间的差值P(i)max-P(i)min，P(i+1)min＝P(i)max+1，1≤i≤M-1且i为整数。
可选的，所述装置还包括：第二设置模块408。
第二设置模块408，被配置为当对所述图像进行对比度无损的内容对应背光控制CABC处理时，设置所述预定数量为1。
综上所述，本实施例提供的背光控制装置，通过获取显示区块所需显示的图像中各像素的灰阶值，然后根据各像素的灰阶值获取预定数量的最大灰阶值中的最小值，并当该最小值达到灰阶值阈值的情况下，控制各像素的灰阶值保持不变，并控制该显示区块的背光亮度保持最大背光亮度，也即不对该显示区块中的图像进行CABC处理；解决了当图像中有高灰阶值的像素时，采用CABC技术对该图像进行处理会导致图像对比度大幅降低，严重影响图像显示效果的问题；实现了当图像中有高灰阶值的像素时不对图像进行CABC处理，避免或减轻了图像对比度损伤，提高了图像质量和显示效果。
另外，本实施例提供的背光控制装置，当图像中不存在高灰阶值的像素(如白色像素)时，采用CABC技术对图像进行处理；当图像中存在高灰阶值的像素(如白色像素)时，不采用CABC技术对图像进行处理。上述动态控制的方式既可以达到节省背光功耗的效果，又保证了图像对比度和显示效果。
另外，本实施例提供的背光控制装置，还通过将屏幕所能显示的灰阶值区间划分为若干个灰阶值子区间，并为每一个灰阶值子区间设置对应的PWM信号占空比，可以简化计算和处理流程，提高背光控制效率。
关于上述实施例中的装置，其中各个模块执行操作的具体方式已经在有关该方法的实施例中进行了详细描述，此处将不做详细阐述说明。
图6是根据一示例性实施例示出的一种用于控制背光的装置600的框图。例如，装置600可以是移动电话，计算机，数字广播终端，消息收发设备，游戏控制台，平板设备，医疗设备，健身设备，个人数字助理等。
参照图6，装置600可以包括以下一个或多个组件：处理组件602，存储器604，电源组件606，多媒体组件608，音频组件610，输入/输出(I/O)的接口612，传感器组件614，以及通信组件616。
处理组件602通常控制装置600的整体操作，诸如与显示，电话呼叫，数据通信，相机操作和记录操作相关联的操作。处理组件602可以包括一个或多个处理器620来执行指令，以完成上述的方法的全部或部分步骤。此外，处理组件602可以包括一个或多个模块，便于处理组件602和其他组件之间的交互。例如，处理组件602可以包括多媒体模块，以 方便多媒体组件608和处理组件602之间的交互。
存储器604被配置为存储各种类型的数据以支持在装置600的操作。这些数据的示例包括用于在装置600上操作的任何应用程序或方法的指令，联系人数据，电话簿数据，消息，图片，视频等。存储器604可以由任何类型的易失性或非易失性存储设备或者它们的组合实现，如静态随机存取存储器(SRAM)，电可擦除可编程只读存储器(EEPROM)，可擦除可编程只读存储器(EPROM)，可编程只读存储器(PROM)，只读存储器(ROM)，磁存储器，快闪存储器，磁盘或光盘。
电源组件606为装置600的各种组件提供电力。电源组件606可以包括电源管理***，一个或多个电源，及其他与为装置600生成、管理和分配电力相关联的组件。
多媒体组件608包括在所述装置600和用户之间的提供一个输出接口的屏幕。在一些实施例中，屏幕可以包括液晶显示器(LCD)和触摸面板(TP)。如果屏幕包括触摸面板，屏幕可以被实现为触摸屏，以接收来自用户的输入信号。触摸面板包括一个或多个触摸传感器以感测触摸、滑动和触摸面板上的手势。所述触摸传感器可以不仅感测触摸或滑动动作的边界，而且还检测与所述触摸或滑动操作相关的持续时间和压力。在一些实施例中，多媒体组件608包括一个前置摄像头和/或后置摄像头。当装置600处于操作模式，如拍摄模式或视频模式时，前置摄像头和/或后置摄像头可以接收外部的多媒体数据。每个前置摄像头和后置摄像头可以是一个固定的光学透镜***或具有焦距和光学变焦能力。
音频组件610被配置为输出和/或输入音频信号。例如，音频组件610包括一个麦克风(MIC)，当装置600处于操作模式，如呼叫模式、记录模式和语音识别模式时，麦克风被配置为接收外部音频信号。所接收的音频信号可以被进一步存储在存储器604或经由通信组件616发送。在一些实施例中，音频组件610还包括一个扬声器，用于输出音频信号。
I/O接口612为处理组件602和***接口模块之间提供接口，上述***接口模块可以是键盘，点击轮，按钮等。这些按钮可包括但不限于：主页按钮、音量按钮、启动按钮和锁定按钮。
传感器组件614包括一个或多个传感器，用于为装置600提供各个方面的状态评估。例如，传感器组件614可以检测到装置600的打开/关闭状态，组件的相对定位，例如所述组件为装置600的显示器和小键盘，传感器组件614还可以检测装置600或装置600一个组件的位置改变，用户与装置600接触的存在或不存在，装置600方位或加速/减速和装置600的温度变化。传感器组件614可以包括接近传感器，被配置用来在没有任何的物理接触时检测附近物体的存在。传感器组件614还可以包括光传感器，如CMOS或CCD图像传感器，用于在成像应用中使用。在一些实施例中，该传感器组件614还可以包括加速度传感器，陀螺仪传感器，磁传感器，压力传感器或温度传感器。
通信组件616被配置为便于装置600和其他设备之间有线或无线方式的通信。装置600可以接入基于通信标准的无线网络，如WiFi，2G或3G，或它们的组合。在一个示例性实 施例中，通信组件616经由广播信道接收来自外部广播管理***的广播信号或广播相关信息。在一个示例性实施例中，所述通信组件616还包括近场通信(NFC)模块，以促进短程通信。例如，在NFC模块可基于射频识别(RFID)技术，红外数据协会(IrDA)技术，超宽带(UWB)技术，蓝牙(BT)技术和其他技术来实现。
在示例性实施例中，装置600可以被一个或多个应用专用集成电路(ASIC)、数字信号处理器(DSP)、数字信号处理设备(DSPD)、可编程逻辑器件(PLD)、现场可编程门阵列(FPGA)、控制器、微控制器、微处理器或其他电子元件实现，用于执行上述方法。
在示例性实施例中，还提供了一种包括指令的非临时性计算机可读存储介质，例如包括指令的存储器604，上述指令可由装置600的处理器620执行以完成上述方法。例如，所述非临时性计算机可读存储介质可以是ROM、随机存取存储器(RAM)、CD-ROM、磁带、软盘和光数据存储设备等。
一种非临时性计算机可读存储介质，当所述存储介质中的指令由装置600的处理器执行时，使得装置600能够执行如上图2或图3A所示的背光控制方法。
本领域技术人员在考虑说明书及实践这里公开的发明后，将容易想到本公开的其它实施方案。本申请旨在涵盖本公开的任何变型、用途或者适应性变化，这些变型、用途或者适应性变化遵循本公开的一般性原理并包括本公开未公开的本技术领域中的公知常识或惯用技术手段。说明书和实施例仅被视为示例性的，本公开的真正范围和精神由下面的权利要求指出。
应当理解的是，本公开并不局限于上面已经描述并在附图中示出的精确结构，并且可以在不脱离其范围进行各种修改和改变。本公开的范围仅由所附的权利要求来限制。

Claims (11)

  1. 一种背光控制方法，其特征在于，所述方法包括：
    对于屏幕中的每一个显示区块，获取所述显示区块所需显示的图像中各像素的灰阶值，所述屏幕中包含至少一个显示区块；
    根据所述各像素的灰阶值获取预定数量的最大灰阶值中的最小值；
    当所述最小值达到灰阶值阈值时，控制所述各像素的灰阶值保持不变，并控制所述显示区块的背光亮度保持最大背光亮度。
  2. 根据权利要求1所述的方法，其特征在于，所述方法还包括：
    当所述最小值未达到所述灰阶值阈值时，获取所述最小值所处的灰阶值子区间；
    根据预设对应关系获取与所述灰阶值子区间对应的占空比，所述预设对应关系包括不同的灰阶值子区间与不同的占空比之间的对应关系，所述占空比的大小与灰阶值的大小呈正相关关系，所述占空比的大小与背光亮度呈正相关关系，且灰阶值最大的灰阶值子区间[P0，Pmax]对应的占空比为100％，P0为所述灰阶值阈值，Pmax为所述屏幕所能显示的最大灰阶值，0＜P0≤Pmax；
    向背光驱动IC发送具有所述占空比的脉冲宽度调制PWM信号，所述PWM信号用于指示所述背光驱动IC根据所述占空比控制所述显示区块的背光亮度。
  3. 根据权利要求2所述的方法，其特征在于，所述方法还包括：
    获取与所述屏幕对应的灰阶值区间[0，Pmax]；
    将所述灰阶值区间[0，Pmax]分成M个灰阶值子区间，M≥2且M为整数；
    分别为每一个灰阶值子区间设置对应的占空比，并保存所述灰阶值子区间与所述占空比之间的对应关系。
  4. 根据权利要求3所述的方法，其特征在于，所述将所述灰阶值区间[0，Pmax]分成M个灰阶值子区间，包括：
    采用等分方式将所述灰阶值区间[0，Pmax]分成所述M个灰阶值子区间，每个灰阶值子区间对应的最大灰阶值与最小灰阶值之间的差值相等；
    或者，
    采用非等分方式将所述灰阶值区间[0，Pmax]分成所述M个灰阶值子区间，第i+1个灰阶值子区间[P(i+1)min，P(i+1)max]对应的最大灰阶值与最小灰阶值之间的差值P(i+1)max-P(i+1)min大于或者等于第i个灰阶值子区间[P(i)min，P(i)max]对应的最大灰阶值与最小灰阶值之间的差值P(i)max-P(i)min，P(i+1)min＝P(i)max+1，1≤i≤M-1且i为整数。
  5. 根据权利要求1至4任一所述的方法，其特征在于，所述方法还包括：
    当对所述图像进行对比度无损的内容对应背光控制CABC处理时，设置所述预定数量为1。
  6. 一种背光控制装置，其特征在于，所述装置包括：
    第一获取模块，被配置为对于屏幕中的每一个显示区块，获取所述显示区块所需显示的图像中各像素的灰阶值，所述屏幕中包含至少一个显示区块；
    第二获取模块，被配置为根据所述各像素的灰阶值获取预定数量的最大灰阶值中的最小值；
    控制模块，被配置为当所述最小值达到灰阶值阈值时，控制所述各像素的灰阶值保持不变，并控制所述显示区块的背光亮度保持最大背光亮度。
  7. 根据权利要求6所述的装置，其特征在于，所述装置还包括：
    第三获取模块，被配置为当所述最小值未达到所述灰阶值阈值时，获取所述最小值所处的灰阶值子区间；
    第四获取模块，被配置为根据预设对应关系获取与所述灰阶值子区间对应的占空比，所述预设对应关系包括不同的灰阶值子区间与不同的占空比之间的对应关系，所述占空比的大小与灰阶值的大小呈正相关关系，所述占空比的大小与背光亮度呈正相关关系，且灰阶值最大的灰阶值子区间[P0，Pmax]对应的占空比为100％，P0为所述灰阶值阈值，Pmax为所述屏幕所能显示的最大灰阶值，0＜P0≤Pmax；
    发送模块，被配置为向背光驱动IC发送具有所述占空比的脉冲宽度调制PWM信号，所述PWM信号用于指示所述背光驱动IC根据所述占空比控制所述显示区块的背光亮度。
  8. 根据权利要求7所述的装置，其特征在于，所述装置还包括：
    第五获取模块，被配置为获取与所述屏幕对应的灰阶值区间[0，Pmax]；
    划分模块，被配置为将所述灰阶值区间[0，Pmax]分成M个灰阶值子区间，M≥2且M为整数；
    第一设置模块，被配置为分别为每一个灰阶值子区间设置对应的占空比，并保存所述灰阶值子区间与所述占空比之间的对应关系。
  9. 根据权利要求8所述的装置，其特征在于，所述划分模块，包括：
    第一划分子模块，被配置为采用等分方式将所述灰阶值区间[0，Pmax]分成所述M个灰阶值子区间，每个灰阶值子区间对应的最大灰阶值与最小灰阶值之间的差值相等；
    或者，
    第二划分子模块，被配置为采用非等分方式将所述灰阶值区间[0，Pmax]分成所述M个灰阶值子区间，第i+1个灰阶值子区间[P(i+1)min，P(i+1)max]对应的最大灰阶值与最小灰阶 值之间的差值P(i+1)max-P(i+1)min大于或者等于第i个灰阶值子区间[P(i)min，P(i)max]对应的最大灰阶值与最小灰阶值之间的差值P(i)max-P(i)min，P(i+1)min＝P(i)max+1，1≤i≤M-1且i为整数。
  10. 根据权利要求6至9任一所述的装置，其特征在于，所述装置还包括：
    第二设置模块，被配置为当对所述图像进行对比度无损的内容对应背光控制CABC处理时，设置所述预定数量为1。
  11. 一种背光控制装置，其特征在于，包括：
    处理器；
    用于存储所述处理器的可执行指令的存储器；
    其中，所述处理器被配置为：
    对于屏幕中的每一个显示区块，获取所述显示区块所需显示的图像中各像素的灰阶值，所述屏幕中包含至少一个显示区块；
    根据所述各像素的灰阶值获取预定数量的最大灰阶值中的最小值；
    当所述最小值达到灰阶值阈值时，控制所述各像素的灰阶值保持不变，并控制所述显示区块的背光亮度保持最大背光亮度。
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