WO2016106976A1 - 调整背光亮度的方法及装置 - Google Patents

调整背光亮度的方法及装置 Download PDF

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Publication number
WO2016106976A1
WO2016106976A1 PCT/CN2015/074172 CN2015074172W WO2016106976A1 WO 2016106976 A1 WO2016106976 A1 WO 2016106976A1 CN 2015074172 W CN2015074172 W CN 2015074172W WO 2016106976 A1 WO2016106976 A1 WO 2016106976A1
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Prior art keywords
brightness
backlight
duty ratio
sub
range
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PCT/CN2015/074172
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English (en)
French (fr)
Inventor
付华东
黄哲
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深圳创维－Rgb电子有限公司
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Priority to US14/906,562 priority Critical patent/US10490137B2/en
Priority to AU2015294824A priority patent/AU2015294824B2/en
Publication of WO2016106976A1 publication Critical patent/WO2016106976A1/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
    • 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
    • G09G3/3406—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
    • G09G3/2007—Display of intermediate tones
    • G09G3/2018—Display of intermediate tones by time modulation using two or more time intervals
    • 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
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0237—Switching ON and OFF the backlight within one frame
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/06—Details of flat display driving waveforms
    • 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
    • G09G2320/0633—Adjustment of display parameters for control of overall brightness by amplitude modulation of the brightness of the 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
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G09G2320/064—Adjustment of display parameters for control of overall brightness by time modulation of the brightness of the 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
    • 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
    • G09G2320/066—Adjustment of display parameters for control of contrast
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/021—Power management, e.g. power saving
    • 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 relates to the field of liquid crystal backlight technology, and in particular, to a method and device for adjusting brightness of a backlight.
  • Liquid crystal display (Liquid Crystal Display, LCD) is a passive illuminator that illuminates by a rear LED backlight. LED backlights have high luminous efficiency and flexible combination, and have been widely used in LCD flat panel TVs.
  • the direct-lit LED backlight can dynamically adjust the brightness of each LED through the area dimming algorithm to achieve energy saving and enhance the dynamic contrast of the image.
  • the traditional area dimming algorithm keeps the maximum current constant and controls the PWM duty cycle value according to the brightness content of the picture.
  • the method of dynamically increasing the contrast based on the area dimming algorithm still has certain limitations, and due to the limitation of contrast enhancement, The display effect of the liquid crystal display is still not ideal enough to affect the viewing effect.
  • the main object of the present invention is to provide a method and apparatus for adjusting the brightness of a backlight, which aims to solve the technical problem that the display effect is not ideal due to the limitation of improving the contrast of the liquid crystal display based on the area dimming algorithm.
  • the present invention provides a method of adjusting backlight brightness, and the method of adjusting backlight brightness includes the following steps:
  • the luminance of each sub-region is controlled correspondingly by the adjusted duty ratio and the driving current.
  • the step of dividing the backlight area of the liquid crystal display into a plurality of sub-areas and acquiring the maximum pixel brightness M of each sub-area, and obtaining the average pixel brightness A according to the maximum pixel brightness M comprises:
  • the maximum pixel brightness M of each sub-area is summed and an average value is calculated, with the average value being the average pixel brightness A.
  • the brightness range includes a first brightness range, a second brightness range, and a third brightness range, wherein the brightness in the first brightness range, the second brightness range, and the third brightness range are sequentially incremented, and the brightness is divided
  • the steps of adjusting the duty ratio and the driving current of the backlights of different brightness ranges according to the average pixel brightness A and the maximum pixel brightness M respectively include:
  • the driving current of the backlight of different brightness ranges is adjusted according to the average pixel brightness A and the maximum pixel brightness M and using a second algorithm.
  • the step of adjusting the duty ratio of the backlight according to the average pixel brightness A and the maximum pixel brightness M and adjusting the different brightness ranges by using the first algorithm comprises:
  • the first duty ratio P1 of the backlight is B1*(M+f(A)), wherein the B1 is a first duty ratio adjustment coefficient, B1>1;
  • the third duty ratio P3 of the backlight is the maximum duty ratio of the backlight.
  • the backlight is turned off, and the first duty ratio P1 of the backlight is zero.
  • the step of adjusting the driving current of the backlight according to the average pixel brightness A and the maximum pixel brightness M and using a second algorithm to adjust different brightness ranges comprises:
  • the first driving current I1 of the backlight is the maximum driving current I of the backlight
  • the second driving current I2 of the backlight is C1*I+f(M, A), wherein the C1 is the first current adjustment coefficient, 0 ⁇ C1 ⁇ 1, f( M, A)>0
  • the third driving current I3 of the backlight is I+f(M, A), where f(M, A) ⁇ 0.
  • the adjusted duty ratio is stored in at least one driver IC register, and the driver IC register outputs the The waveform signal corresponding to the space ratio controls the luminance of each sub-area.
  • the present invention also provides an apparatus for adjusting brightness of a backlight, the apparatus comprising:
  • An acquisition module configured to divide a backlight area of the liquid crystal display into a plurality of sub-areas, and obtain a maximum pixel brightness M of each sub-area, and obtain an average pixel brightness A according to the maximum pixel brightness M;
  • An adjustment module configured to divide the brightness into a plurality of brightness ranges, and adjust a duty ratio and a driving current of the backlights of different brightness ranges according to the average pixel brightness A and the maximum pixel brightness M;
  • a determining module configured to determine, according to a maximum pixel brightness M of each sub-region, a brightness range in which the sub-region is located, and obtain an adjusted duty ratio and a driving current corresponding to a brightness range in which each sub-region is located;
  • control module configured to control, according to the adjusted duty ratio and the driving current, the brightness of each sub-area.
  • the acquiring module is specifically configured to divide a backlight area of the liquid crystal display into a plurality of sub-areas, detect the brightness of the pixels of each sub-area, and obtain a maximum pixel brightness M of the light-emitting diodes in each sub-area according to the input screen; The maximum pixel brightness M of each sub-area is summed and an average value is calculated, with the average value being the average pixel brightness A.
  • the brightness range includes a first brightness range, a second brightness range, and a third brightness range, wherein the brightness in the first brightness range, the second brightness range, and the third brightness range are sequentially incremented, and the adjustment module includes :
  • a duty ratio adjusting unit configured to adjust a duty ratio of the backlight of different brightness ranges according to the average pixel brightness A and the maximum pixel brightness M according to the first algorithm
  • the driving current adjusting unit is configured to adjust driving currents of the backlights of different brightness ranges according to the average pixel brightness A and the maximum pixel brightness M and adopt a second algorithm.
  • the duty ratio adjustment unit comprises:
  • a first adjustment subunit configured to be a first duty ratio P1 of the backlight when the first brightness range is B1*(M+f(A)), wherein the B1 is a first duty ratio adjustment coefficient, B1>1;
  • the third adjusting subunit is configured to: when the third brightness range is, the third duty ratio P3 of the backlight is the maximum duty ratio of the backlight.
  • the driving current adjustment unit comprises:
  • the first driving current I1 of the backlight is the maximum driving current I of the backlight
  • a fifth adjustment subunit configured to: when the second brightness range is, the second driving current I2 of the backlight is C1*I+f(M, A), wherein the C1 is a first current adjustment coefficient, 0 ⁇ C1 ⁇ 1,f(M,A)>0
  • control module is configured to: when the brightness of each sub-area is controlled by using the adjusted duty ratio, store the adjusted duty ratio in at least one driver IC register, by using the The driving IC register outputs a waveform signal corresponding to the duty ratio to control the luminance of each sub-area.
  • the invention provides a method and a device for adjusting the brightness of a backlight, dividing the backlight area of the liquid crystal display into a plurality of sub-areas, dividing the brightness into a plurality of brightness ranges, and then dynamically according to the maximum pixel brightness M and the average pixel brightness A of each sub-area. Adjusting the duty ratio and driving current of the backlight to control the brightness of each sub-area. In this way, the duty ratio and driving current of the backlight can be dynamically adjusted according to the current picture, thereby widening the illumination of the backlight.
  • the range of the brightness of the diode enhances the contrast and enhances the display.
  • FIG. 1 is a schematic flow chart of an embodiment of a method for adjusting backlight brightness according to the present invention
  • FIG. 2 is a schematic diagram of a refinement process of step S102 in FIG. 1;
  • FIG. 3 is a schematic diagram of a graph of luminous power and current of an LED
  • FIG. 4 is a schematic diagram of functional modules of an embodiment of an apparatus for adjusting backlight brightness according to the present invention.
  • FIG. 5 is a schematic diagram of a refinement function module of the adjustment module in FIG. 4.
  • the present invention provides a method for adjusting the brightness of a backlight.
  • the method for adjusting brightness of a backlight includes:
  • Step S101 the backlight area of the liquid crystal display is divided into a plurality of sub-areas, and the maximum pixel brightness M of each sub-area is obtained, and the average pixel brightness A is obtained according to the maximum pixel brightness M;
  • the backlight area of the liquid crystal display is divided into a plurality of sub-areas of the same size, and the maximum pixel brightness M of each sub-area is obtained according to the transmitted picture for the LED LEDs in the divided sub-areas.
  • the maximum pixel brightness M of each sub-area is obtained, and then the maximum pixel brightness M of each sub-area is summed and an average value is calculated, which is the average pixel brightness.
  • the backlight area of the liquid crystal display is divided into a plurality of sub-areas to separately control the backlight brightness of the plurality of sub-areas.
  • Step S102 dividing brightness into a plurality of brightness ranges, and adjusting duty ratios and driving currents of the backlights of different brightness ranges according to the average pixel brightness A and the maximum pixel brightness M;
  • the luminance is divided into a plurality of luminance ranges, and an 8-bit gray scale is taken as an example for description.
  • an 8-bit gray scale is taken as an example for description.
  • two grayscales a1 and a2 (a1 ⁇ a2) located in the middle are taken, and 0 is ⁇ a1 is divided into a low-light range, a1 to a2 are divided into a medium-light range, and a2 to 255 are divided into a highlight range.
  • This embodiment is not limited to the above-described division method of luminance, and may be divided by other methods.
  • the duty ratios of the backlights of different brightness ranges are respectively adjusted according to the average pixel brightness A and the maximum pixel brightness M. As described above, if the brightness is divided into three brightness ranges, the three brightness ranges are respectively adjusted. Corresponding duty ratio, and making the duty ratio gain curves corresponding to the three brightness ranges continuous; respectively adjusting the driving currents corresponding to the three brightness ranges according to the light emitting characteristics of the light emitting diodes, and making the currents corresponding to the three brightness ranges The curve is continuous.
  • the duty ratio and the driving current of the backlights of different brightness ranges are respectively adjusted according to the average pixel brightness A and the maximum pixel brightness M, that is, the duty ratio and the driving of the backlight can be dynamically adjusted according to the current screen of the liquid crystal display.
  • the current thereby widening the range of the luminance of the light-emitting diode, further improves the contrast.
  • Step S103 determining a brightness range in which the sub-area is located according to a maximum pixel brightness M of each sub-area, and obtaining an adjusted duty ratio and a driving current corresponding to a brightness range in which each sub-area is located;
  • the brightness range of the sub-area is determined according to the maximum pixel brightness M of each sub-area, and it is determined whether it belongs to the low-light range, the medium-light range, or the highlight range, and then the corresponding brightness range is obtained according to the brightness range in which it is located. Adjusted duty cycle and drive current.
  • the brightness is divided into a plurality of brightness ranges, and the brightness range in which each sub-area is located is determined to separately control the backlight brightness of the sub-areas of different brightness ranges.
  • step S104 the brightness of each sub-area is controlled correspondingly by the adjusted duty ratio and the driving current.
  • the adjusted duty ratio when the brightness of each sub-area is controlled by the adjusted duty ratio, the adjusted duty ratio is stored in at least one driver IC register, and the output is output through the driver IC register.
  • the waveform signal corresponding to the duty ratio controls the luminance of each sub-area.
  • the main IC starts to acquire image information and sends image information to the processor through the SPI interface, and the processor adjusts the duty ratio of the image information, and
  • the adjusted duty ratio is stored in one driver or a plurality of IC registers, so that the IC register outputs waveform signals of different duty ratios to control the brightness of the light emitting diodes, thereby controlling the display brightness of each sub-area.
  • the duty ratio is dynamically adjusted according to the brightness of each sub-area picture, but also the driving current of the light-emitting diode is dynamically adjusted according to the light-emitting characteristics of the light-emitting diode, so that the backlight can be expanded in a dark scene and is bright.
  • the brightness can be increased in a short time, which can expand the range of dynamic brightness, further improve the contrast of the dynamic picture, and enhance the display effect.
  • the embodiment divides the backlight area of the liquid crystal display into a plurality of sub-areas, divides the brightness into a plurality of brightness ranges, and then dynamically adjusts the backlight according to the maximum pixel brightness M and the average pixel brightness A of each sub-area.
  • the duty ratio of the source and the driving current to control the brightness of each sub-area.
  • the duty ratio and driving current of the backlight can be dynamically adjusted according to the current picture, thereby widening the light-emitting diode of the backlight.
  • the range of the brightness of the light further enhances the contrast and enhances the display.
  • the foregoing step S102 includes:
  • Step S1021 according to the average pixel brightness A and the maximum pixel brightness M, and adopting a first algorithm to adjust a duty ratio of the backlight of different brightness ranges;
  • Step S1022 according to the average pixel brightness A and the maximum pixel brightness M, and using a second algorithm to adjust driving currents of the backlights of different brightness ranges.
  • the divided brightness range preferably includes a first brightness range, a second brightness range, and a third brightness range, wherein the brightness in the first brightness range, the second brightness range, and the third brightness range are sequentially incremented
  • the luminance range preferably includes a low luminance range, a medium luminance range, and a high luminance range.
  • the duty cycle is nonlinear, the more uniform the gray distribution, the smaller the drive current, so that the voltage of the drive circuit will decrease, then the power consumption will decrease;
  • the range is such that the duty ratio is constant and the gray distribution is more uniform, indicating that the brighter the picture and the lesser detail of the picture, the driving current needs to be reduced, so that the voltage of the driving circuit is also lowered, and the power consumption is lowered.
  • the step S1021 in the embodiment of FIG. 2 is configured to adjust the duty ratio of the backlight of different brightness ranges according to the average pixel brightness A and the maximum pixel brightness M and using a first algorithm.
  • the first duty ratio P1 of the backlight is B1*(M+f(A)), wherein the B1 is the first duty ratio adjustment coefficient, B1>1, and f(A) is a correction function with the average pixel brightness A as a variable, when the image of the input image is When the screen is 100% black, it is required to turn off the backlight, then the duty ratio of the corresponding sub-area is 0;
  • the third duty ratio P3 of the backlight is the maximum duty ratio of the backlight.
  • the first brightness range, the second brightness range, and the third brightness range are The duty cycle gain curve is continuous.
  • FIG. 3 is a schematic diagram of the light-emitting characteristics of the light-emitting diode.
  • the abscissa is the driving current value
  • the ordinate is the luminous power (the greater the luminous power, the greater the brightness value).
  • the light-emitting characteristics of the light-emitting diodes are different if the current values are input, but if the current exceeding the rated value is input, the light-emitting diodes will emit light in a short time and the brightness exceeds the rated state, and then slowly Fall back to the saturation zone and keep the brightness of the light fixed.
  • the driving current of the backlight can be adjusted by using the characteristic of the light emitting diode. Step S1022 in the embodiment of FIG. 2 adjusts the different brightness ranges according to the average pixel brightness A and the maximum pixel brightness M and adopts a second algorithm.
  • the step of driving current of the backlight includes:
  • the first driving current I1 of the backlight is the maximum driving current I of the backlight
  • the maximum driving current I is the maximum current value in the specification.
  • the second driving current I2 of the backlight is C1*I+f(M, A), wherein the C1 is the first current adjustment coefficient, 0 ⁇ C1 ⁇ 1, f( M, A) > 0, f (M, A)
  • the larger the difference between the maximum pixel brightness M of the picture of the sub-area and the average pixel brightness A the more discrete the gray level distribution of the sub-area, C1.
  • f(M, A) is larger; conversely, the smaller the difference between the maximum pixel brightness M and the average pixel brightness A of the picture of the sub-area, the more uniform the gray level distribution of the sub-area, C1, f(M, A) The smaller it is.
  • the third driving current I3 of the backlight is I+f(M, A), where f(M, A) ⁇ 0, f(M, A) It is also a function of the average pixel brightness A and the maximum pixel brightness M as variables, but the value range is different.
  • the difference between the maximum pixel brightness M of the picture of the sub-area and the average pixel brightness A is larger, the gray level of the sub-area is indicated. The more discrete the distribution, the larger f(M, A); the smaller f(M, A) is.
  • the current curve of the first brightness range, the second brightness range, and the third brightness range is continuous by adjusting the values of the first current adjustment coefficients C1, f(M, A).
  • the present invention also provides an apparatus for adjusting the brightness of a backlight. As shown in FIG. 4, in an embodiment, the apparatus includes:
  • the obtaining module 101 is configured to divide the backlight area of the liquid crystal display into a plurality of sub-areas, and obtain a maximum pixel brightness M of each sub-area, and obtain an average pixel brightness A according to the maximum pixel brightness M;
  • the backlight area of the liquid crystal display is divided into a plurality of sub-areas of the same size, and the maximum pixel brightness M of each sub-area is obtained according to the transmitted picture for the LED LEDs in the divided sub-areas.
  • the maximum pixel brightness M of each sub-area is obtained, and then the maximum pixel brightness M of each sub-area is summed and an average value is calculated, which is the average pixel brightness.
  • the backlight area of the liquid crystal display is divided into a plurality of sub-areas to separately control the backlight brightness of the plurality of sub-areas.
  • the adjusting module 102 is configured to divide the brightness into a plurality of brightness ranges, and adjust a duty ratio and a driving current of the backlights of different brightness ranges according to the average pixel brightness A and the maximum pixel brightness M;
  • the luminance is divided into a plurality of luminance ranges, and an 8-bit gray scale is taken as an example for description.
  • an 8-bit gray scale is taken as an example for description.
  • two grayscales a1 and a2 (a1 ⁇ a2) located in the middle are taken, and 0 is ⁇ a1 is divided into a low-light range, a1 to a2 are divided into a medium-light range, and a2 to 255 are divided into a highlight range.
  • This embodiment is not limited to the above-described division method of luminance, and may be divided by other methods.
  • the duty ratios of the backlights of different brightness ranges are respectively adjusted according to the average pixel brightness A and the maximum pixel brightness M. As described above, if the brightness is divided into three brightness ranges, the three brightness ranges are respectively adjusted. Corresponding duty ratio, and making the duty ratio gain curves corresponding to the three brightness ranges continuous; respectively adjusting the driving currents corresponding to the three brightness ranges according to the light emitting characteristics of the light emitting diodes, and making the currents corresponding to the three brightness ranges The curve is continuous.
  • the duty ratio and the driving current of the backlights of different brightness ranges are respectively adjusted according to the average pixel brightness A and the maximum pixel brightness M, that is, the duty ratio and the driving of the backlight can be dynamically adjusted according to the current screen of the liquid crystal display.
  • the current thereby widening the range of the luminance of the light-emitting diode, further improves the contrast.
  • the determining module 103 is configured to determine, according to the maximum pixel brightness M of each sub-area, a brightness range in which the sub-area is located, and obtain an adjusted duty ratio and a driving current corresponding to a brightness range in which each sub-area is located;
  • the brightness range of the sub-area is determined according to the maximum pixel brightness M of each sub-area, and it is determined whether it belongs to the low-light range, the medium-light range, or the highlight range, and then the corresponding brightness range is obtained according to the brightness range in which it is located. Adjusted duty cycle and drive current.
  • the brightness is divided into a plurality of brightness ranges, and the brightness range in which each sub-area is located is determined to separately control the backlight brightness of the sub-areas of different brightness ranges.
  • the control module 104 is configured to control the brightness of each sub-area correspondingly by using the adjusted duty ratio and the driving current.
  • the adjusted duty ratio when the brightness of each sub-area is controlled by the adjusted duty ratio, the adjusted duty ratio is stored in at least one driver IC register, and the output is output through the driver IC register.
  • the waveform signal corresponding to the duty ratio controls the luminance of each sub-area.
  • the main IC starts to acquire image information and sends image information to the processor through the SPI interface, and the processor adjusts the duty ratio of the image information, and
  • the adjusted duty ratio is stored in one driver or a plurality of IC registers, so that the IC register outputs waveform signals of different duty ratios to control the brightness of the light emitting diodes, thereby controlling the display brightness of each sub-area.
  • the duty ratio is dynamically adjusted according to the brightness of each sub-area picture, but also the driving current of the light-emitting diode is dynamically adjusted according to the light-emitting characteristics of the light-emitting diode, so that the backlight can be expanded in a dark scene and is bright.
  • the brightness can be increased in a short time, which can expand the range of dynamic brightness, further improve the contrast of the dynamic picture, and enhance the display effect.
  • the adjustment module 102 includes:
  • the duty ratio adjusting unit 1021 is configured to adjust a duty ratio of the backlight of different brightness ranges according to the average pixel brightness A and the maximum pixel brightness M and adopt a first algorithm;
  • the driving current adjusting unit 1022 is configured to adjust driving currents of the backlights of different brightness ranges according to the average pixel brightness A and the maximum pixel brightness M and adopt a second algorithm.
  • the divided brightness range preferably includes a first brightness range, a second brightness range, and a third brightness range, wherein the brightness in the first brightness range, the second brightness range, and the third brightness range are sequentially incremented
  • the luminance range preferably includes a low luminance range, a medium luminance range, and a high luminance range.
  • the duty cycle is nonlinear, the more uniform the gray distribution, the smaller the drive current, so that the voltage of the drive circuit will decrease, then the power consumption will decrease;
  • the range is such that the duty ratio is constant and the gray distribution is more uniform, indicating that the brighter the picture and the lesser detail of the picture, the driving current needs to be reduced, so that the voltage of the driving circuit is also lowered, and the power consumption is lowered.
  • the duty ratio adjusting unit 1021 in the embodiment of FIG. 5 includes:
  • a first adjustment subunit configured to be a first duty ratio P1 of the backlight when the first brightness range is B1*(M+f(A)), wherein the B1 is the first duty ratio adjustment coefficient, B1>1, and f(A) is a correction function with the average pixel brightness A as a variable, when the image of the input image is When the screen is 100% black, it is required to turn off the backlight, then the duty ratio of the corresponding sub-area is 0;
  • the third adjusting subunit is configured to: when the third brightness range is, the third duty ratio P3 of the backlight is the maximum duty ratio of the backlight.
  • the first brightness range, the second brightness range, and the third brightness range are The duty cycle gain curve is continuous.
  • FIG. 3 is a schematic diagram of the light-emitting characteristics of the light-emitting diode.
  • the driving current adjusting unit 1022 in the embodiment of FIG. 5 includes:
  • the first driving current I1 of the backlight is the maximum driving current I of the backlight
  • the maximum driving current I is the maximum current value in the specification
  • a fifth adjustment subunit configured to: when the second brightness range is, the second driving current I2 of the backlight is C1*I+f(M, A), wherein the C1 is a first current adjustment coefficient, 0 ⁇ C1 ⁇ 1, f(M,A)>0,f(M,A)
  • f(M, A) is larger; conversely, the smaller the difference between the maximum pixel brightness M and the average pixel brightness A of the picture of the sub-area, the more uniform the gray level distribution of the sub-area, C1, f(M, A) the smaller;
  • the difference between the maximum pixel brightness M of the picture of the sub-area and the average pixel brightness A is larger, the gray level of the sub-area is indicated. The more discrete the distribution, the larger f(M, A); the smaller f(M, A) is.
  • the current curve of the first brightness range, the second brightness range, and the third brightness range is continuous by adjusting the values of the first current adjustment coefficients C1, f(M, A).

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Abstract

提供了一种调整液晶显示器背光亮度的方法及装置，所述方法包括以下步骤：将液晶显示器的背光区域划分为多个子区域，并获取每个子区域的最大像素亮度M，根据所述最大像素亮度M获取平均像素亮度A（S101）；将亮度划分为多个亮度范围，根据所述平均像素亮度A及最大像素亮度M分别调整不同亮度范围的背光源的占空比及驱动电流（S102）；根据每个子区域的最大像素亮度M判断所述子区域所处的亮度范围，获取每个子区域所处的亮度范围对应的调整后的占空比及驱动电流（S103）；利用所述调整后的占空比及驱动电流对应地控制每个子区域的发光亮度（S104）。

Description

调整背光亮度的方法及装置
技术领域
本发明涉及液晶背光技术领域，尤其涉及一种调整背光亮度的方法及装置。
背景技术
液晶显示器（Liquid Crystal Display，LCD）是被动发光体，其靠后面的发光二极管背光源来发光。发光二极管背光源的发光效率高，组合方式灵活，在液晶平板电视上得到了广泛的应用。
目前，直下式发光二极管背光源可以通过区域调光算法动态调整每颗发光二极管的亮度，达到节能并增强图像动态对比度的目的。传统的区域调光算法是保持最大电流不变，根据画面的亮度内容来控制PWM占空比值。在这种方法中，由于大多数时间内发光二极管的背光亮度是达不到最大值的，因此，基于区域调光算法动态提升对比度的方法仍然具有一定的局限性，并且由于对比度提升的限制，使得液晶显示器的显示效果仍不够理想，影响观看效果。
上述内容仅用于辅助理解本发明的技术方案，并不代表承认上述内容是现有技术。
发明内容
本发明的主要目的在于提供一种调整背光亮度的方法及装置，旨在解决基于区域调光算法提升液晶显示器的对比度具有局限性导致显示效果不够理想的技术问题。
为实现上述目的，本发明提供一种调整背光亮度的方法，所述调整背光亮度的方法包括以下步骤：
将液晶显示器的背光区域划分为多个子区域，并获取每个子区域的最大像素亮度M，根据所述最大像素亮度M获取平均像素亮度A；
将亮度划分为多个亮度范围，根据所述平均像素亮度A及最大像素亮度M分别调整不同亮度范围的背光源的占空比及驱动电流；
根据每个子区域的最大像素亮度M判断所述子区域所处的亮度范围，获取每个子区域所处的亮度范围对应的调整后的占空比及驱动电流；
利用所述调整后的占空比及驱动电流对应地控制每个子区域的发光亮度。
优选地，所述将液晶显示器的背光区域划分为多个子区域，并获取每个子区域的最大像素亮度M，根据所述最大像素亮度M获取平均像素亮度A的步骤包括：
将液晶显示器的背光区域划分为多个子区域，对每个子区域的像素的亮度进行检测，根据输入画面获取每个子区域内的发光二极管的最大像素亮度M；
将每个子区域的最大像素亮度M进行求和并计算得到平均值，以所述平均值作为所述平均像素亮度A。
优选地，所述亮度范围包括第一亮度范围、第二亮度范围及第三亮度范围，所述第一亮度范围、第二亮度范围及第三亮度范围中的亮度依次递增，所述将亮度划分为多个亮度范围，根据所述平均像素亮度A及最大像素亮度M分别调整不同亮度范围的背光源的占空比及驱动电流的步骤包括：
根据所述平均像素亮度A及最大像素亮度M并采用第一算法调整不同亮度范围的所述背光源的占空比；
根据所述平均像素亮度A及最大像素亮度M并采用第二算法调整不同亮度范围的所述背光源的驱动电流。
优选地，所述根据所述平均像素亮度A及最大像素亮度M并采用第一算法调整不同亮度范围的所述背光源的占空比的步骤包括：
当为第一亮度范围时，所述背光源的第一占空比P1= B1*（M+f(A)），其中，所述B1为第一占空比调整系数，B1>1；
当为第二亮度范围时，所述背光源的第二占空比P2= B2* M，其中，所述B2为第二占空比调整系数，1<B2<2；
当为第三亮度范围时，所述背光源的第三占空比P3为所述背光源的最大占空比。
优选地，当输入画面为100%黑场画面时，将所述背光源关闭，所述背光源的第一占空比P1=0。
优选地，所述根据所述平均像素亮度A及最大像素亮度M并采用第二算法调整不同亮度范围的所述背光源的驱动电流的步骤包括：
当为第一亮度范围时，所述背光源的第一驱动电流I1为所述背光源的最大驱动电流I；
当为第二亮度范围时，所述背光源的第二驱动电流I2=C1*I+f(M，A)，其中，所述C1为第一电流调整系数，0<C1<1，f(M，A)>0
当为第三亮度范围时，所述背光源的第三驱动电流I3=I+ f(M，A)，其中，f(M，A)≤0。
优选地，在利用所述调整后的占空比控制每个子区域的发光亮度时，将所述调整后的占空比存储于至少一个驱动IC寄存器中，通过所述驱动IC寄存器输出所述占空比对应的波形信号控制每个子区域的发光亮度。
此外，为实现上述目的，本发明还提供一种调整背光亮度的装置，所述装置包括：
获取模块，用于将液晶显示器的背光区域划分为多个子区域，并获取每个子区域的最大像素亮度M，根据所述最大像素亮度M获取平均像素亮度A；
调整模块，用于将亮度划分为多个亮度范围，根据所述平均像素亮度A及最大像素亮度M分别调整不同亮度范围的背光源的占空比及驱动电流；
判断模块，用于根据每个子区域的最大像素亮度M判断所述子区域所处的亮度范围，获取每个子区域所处的亮度范围对应的调整后的占空比及驱动电流；
控制模块，用于利用所述调整后的占空比及驱动电流对应地控制每个子区域的发光亮度。
优选地，所述获取模块具体用于将液晶显示器的背光区域划分为多个子区域，对每个子区域的像素的亮度进行检测，根据输入画面获取每个子区域内的发光二极管的最大像素亮度M；将每个子区域的最大像素亮度M进行求和并计算得到平均值，以所述平均值作为所述平均像素亮度A。
优选地，所述亮度范围包括第一亮度范围、第二亮度范围及第三亮度范围，所述第一亮度范围、第二亮度范围及第三亮度范围中的亮度依次递增，所述调整模块包括：
占空比调整单元，用于根据所述平均像素亮度A及最大像素亮度M并采用第一算法调整不同亮度范围的所述背光源的占空比；
驱动电流调整单元，用于根据所述平均像素亮度A及最大像素亮度M并采用第二算法调整不同亮度范围的所述背光源的驱动电流。
优选地，所述占空比调整单元包括：
第一调整子单元，用于当为第一亮度范围时，所述背光源的第一占空比P1= B1*（M+f(A)），其中，所述B1为第一占空比调整系数，B1>1；
第二调整子单元，用于当为第二亮度范围时，所述背光源的第二占空比P2= B2* M，其中，所述B2为第二占空比调整系数，1<B2<2；
第三调整子单元，用于当为第三亮度范围时，所述背光源的第三占空比P3为所述背光源的最大占空比。
优选地，所述第一调整子单元还用于当输入画面为100%黑场画面时，将所述背光源关闭，所述背光源的第一占空比P1=0。
优选地，所述驱动电流调整单元包括：
第四调整子单元，用于当为第一亮度范围时，所述背光源的第一驱动电流I1为所述背光源的最大驱动电流I；
第五调整子单元，用于当为第二亮度范围时，所述背光源的第二驱动电流I2=C1*I+f(M，A)，其中，所述C1为第一电流调整系数，0<C1<1，f(M，A)>0
第六调整子单元，用于当为第三亮度范围时，所述背光源的第三驱动电流I3=I+ f(M，A)，其中，f(M，A)≤0。
优选地，所述控制模块具体用于在利用所述调整后的占空比控制每个子区域的发光亮度时，将所述调整后的占空比存储于至少一个驱动IC寄存器中，通过所述驱动IC寄存器输出所述占空比对应的波形信号控制每个子区域的发光亮度。
本发明一种调整背光亮度的方法及装置，将液晶显示器的背光区域划分为多个子区域，并将亮度划分为多个亮度范围，然后根据每个子区域的最大像素亮度M及平均像素亮度A动态调整背光源的占空比及驱动电流，以控制每个子区域的发光亮度，通过这种方式，能够根据当前的画面动态地调整背光源的占空比及驱动电流，从而扩宽背光源的发光二极管的发光亮度的范围，进一步提高对比度，增强显示效果。
附图说明
图1为本发明调整背光亮度的方法一实施例的流程示意图；
图2为图1中步骤S102的细化流程示意图；
图3为发光二极管发光功率与电流的的曲线示意图；
图4为本发明调整背光亮度的装置一实施例的功能模块示意图；
图5为图4中调整模块的细化功能模块示意图。
本发明目的的实现、功能特点及优点将结合实施例，参照附图做进一步说明。
具体实施方式
应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。
本发明提供一种调整背光亮度的方法，参照图1，在一实施例中，该调整背光亮度的方法包括：
步骤S101，将液晶显示器的背光区域划分为多个子区域，并获取每个子区域的最大像素亮度M，根据所述最大像素亮度M获取平均像素亮度A；
本实施例中，将液晶显示器的背光区域划分成若干个相同大小的子区域，对划分的各个子区域内的发光二极管LED灯根据传输的画面获取每个子区域的最大像素亮度M，本实施例通过对每个子区域的像素的亮度进行检测，从而得到每个子区域的最大像素亮度M，然后将每个子区域的最大像素亮度M进行求和并计算得到平均值，该平均值即为平均像素亮度A。
本实施例将液晶显示器的背光区域划分为多个子区域，以便对多个子区域的背光亮度分别进行控制。
步骤S102，将亮度划分为多个亮度范围，根据所述平均像素亮度A及最大像素亮度M分别调整不同亮度范围的所述背光源的占空比及驱动电流；
本实施例中，将亮度划分为多个亮度范围，以8比特灰度为例进行说明，在0～255灰度中取两个位于中间的灰度a1、a2（a1<a2），将0～a1划分为低亮范围，a1～a2划分为中亮范围，a2～255划分为高亮范围，本实施例不限定于上述的这种亮度的划分方式，还可以使用其他的方式进行划分。
本实施例中，根据平均像素亮度A及最大像素亮度M分别调整不同亮度范围的背光源的占空比，如上所述，如将亮度划分为3个亮度范围，则分别调整这3个亮度范围对应的占空比，并使得这3个亮度范围对应的占空比增益曲线连续；根据发光二极管的发光特性分别调整这3个亮度范围对应的驱动电流，并使得这3个亮度范围对应的电流曲线连续。
本实施例中，根据平均像素亮度A及最大像素亮度M分别调整不同亮度范围的背光源的占空比及驱动电流，即能够根据液晶显示器当前的画面动态地调整背光源的占空比及驱动电流，从而扩宽发光二极管的发光亮度的范围，进一步提高对比度。
步骤S103，根据每个子区域的最大像素亮度M判断所述子区域所处的亮度范围，获取每个子区域所处的亮度范围对应的调整后的占空比及驱动电流；
本实施例中，根据每个子区域的最大像素亮度M判断该子区域所处的亮度范围，判断其属于低亮范围、中亮范围还是高亮范围，然后根据其所处的亮度范围获取对应的调整后的占空比及驱动电流。
本实施例将亮度划分为多个亮度范围，判断每个子区域所处的亮度范围，以便对不同亮度范围的的子区域的背光亮度分别进行控制。
步骤S104，利用所述调整后的占空比及驱动电流对应地控制每个子区域的发光亮度。
本实施例中，在利用所述调整后的占空比控制每个子区域的发光亮度时，将所述调整后的占空比存储于至少一个驱动IC寄存器中，通过所述驱动IC寄存器输出所述占空比对应的波形信号控制每个子区域的发光亮度。
进一步地，当液晶显示器的主IC产生的垂直同步信号VSYNC的上升沿到来时，主IC就开始采集图像信息并通过SPI接口发送图像信息给处理器，处理器调整图像信息的占空比，将调整后的占空比存储于一个驱动或多个IC寄存器中，从而IC寄存器输出不同占空比的波形信号以达到控制发光二极管的发光亮度，从而控制每个子区域的显示亮度。
本实施例中，不仅根据每个子区域画面的亮度动态调整占空比，还根据发光二极管的发光特性，动态调整发光二极管的驱动电流，使得背光源在暗场景下还可以进行拓展，且在亮场景下可以短时间提高亮度，这样就能扩大动态亮度的范围，进一步提高动态画面的对比度，增强显示效果。
与现有技术相比，本实施例将液晶显示器的背光区域划分为多个子区域，并将亮度划分为多个亮度范围，然后根据每个子区域的最大像素亮度M及平均像素亮度A动态调整背光源的占空比及驱动电流，以控制每个子区域的发光亮度，通过这种方式，能够根据当前的画面动态地调整背光源的占空比及驱动电流，从而扩宽背光源的发光二极管的发光亮度的范围，进一步提高对比度，增强显示效果。
在一优选的实施例中，如图2所示，在上述图1的实施例的基础上，上述步骤S102包括：
步骤S1021，根据所述平均像素亮度A及最大像素亮度M并采用第一算法调整不同亮度范围的所述背光源的占空比；
步骤S1022，根据所述平均像素亮度A及最大像素亮度M并采用第二算法调整不同亮度范围的所述背光源的驱动电流。
本实施例中，所划分的亮度范围优选地包括第一亮度范围、第二亮度范围及第三亮度范围，所述第一亮度范围、第二亮度范围及第三亮度范围中的亮度依次递增，也可以理解为亮度范围优选地包括低亮度范围、中亮度范围及高亮度范围。采用第一算法调整第一亮度范围、第二亮度范围及第三亮度范围的背光源的占空比时及驱动电流时，在第一亮度范围，使占空比有增益，这样提高驱动电流有利于提高对比度；在第二亮度范围，使占空比呈现非线性，灰度分布越均匀，则驱动电流就越小，这样驱动电路的电压就会下降，那么功耗就下降；在第三亮度范围，使占空比恒定不变，灰度分布越均匀，说明画面越亮，画面细节少，那么驱动电流就需要削减，这样驱动电路的电压同样会下降，功耗就下降。
在一优选的实施例中，上述图2的实施例中的步骤S1021根据所述平均像素亮度A及最大像素亮度M并采用第一算法调整不同亮度范围的所述背光源的占空比的步骤包括：
当为第一亮度范围时，所述背光源的第一占空比P1= B1*（M+f(A)），其中，所述B1为第一占空比调整系数，B1>1，f(A)为以平均像素亮度A为变量的修正函数，当输入图像的画面为100%黑场画面时，则要求关闭背光，那么对应子区域的占空比为0；
当为第二亮度范围时，所述背光源的第二占空比P2= B2* M，其中，所述B2为第二占空比调整系数，1<B2<2；
当为第三亮度范围时，所述背光源的第三占空比P3为所述背光源的最大占空比。
本实施例中，通过调配第一占空比调整系数B1、第二占空比调整系数B2及修正函数f(A)的值，使得第一亮度范围、第二亮度范围及第三亮度范围的占空比增益曲线连续。
在一优选的实施例中，请结合参阅图3，图3为发光二极管的发光特性示意图，横坐标为驱动电流值，纵坐标为发光功率（发光功率越大，则亮度值越大），在给定直流驱动电流时，发光二极管工作后很快达到饱和区并保持稳定，发光亮度维持固定。即发光二极管的发光特性为若输入不同的电流值，发光亮度会有所不同，但若输入超出额定值的电流时，发光二极管会在短时间内发光亮度超过额定状态的亮度，然后再慢慢回落到饱和区，并保持发光亮度固定。利用发光二极管的这种特性，可对背光源的驱动电流进行调整，上述图2的实施例中的步骤S1022根据所述平均像素亮度A及最大像素亮度M并采用第二算法调整不同亮度范围的所述背光源的驱动电流的步骤包括：
当为第一亮度范围时，背光源的第一驱动电流I1为所述背光源的最大驱动电流I，最大驱动电流I是规格书上的最大电流值。
当为第二亮度范围时，所述背光源的第二驱动电流I2=C1*I+f(M，A)，其中，所述C1为第一电流调整系数，0<C1<1，f(M，A)>0，f(M，A) 为以平均像素亮度A及最大像素亮度M为变量的函数，当子区域的画面的最大像素亮度M与平均像素亮度A的差值越大，说明该子区域的灰度分布越离散，C1、f(M，A)就越大；反之，当子区域的画面的最大像素亮度M与平均像素亮度A的差值越小，说明该子区域的灰度分布越均匀，C1、f(M，A)就越小。
当为第三亮度范围时，所述背光源的第三驱动电流I3=I+ f(M，A)，其中，f(M，A)≤0，f(M，A) 也是以平均像素亮度A及最大像素亮度M为变量的函数，只是取值范围不同，当子区域的画面的最大像素亮度M与平均像素亮度A的差值越大，说明该子区域的灰度分布越离散，f(M，A)越大；反之f(M，A)就越小。
本实施例通过调配第一电流调整系数C1、f(M，A)的值，使得第一亮度范围、第二亮度范围及第三亮度范围的电流曲线连续。
本发明还提供一种调整背光亮度的装置，如图4所示，在一实施例中，所述装置包括：
获取模块101，用于将液晶显示器的背光区域划分为多个子区域，并获取每个子区域的最大像素亮度M，根据所述最大像素亮度M获取平均像素亮度A；
本实施例中，将液晶显示器的背光区域划分成若干个相同大小的子区域，对划分的各个子区域内的发光二极管LED灯根据传输的画面获取每个子区域的最大像素亮度M，本实施例通过对每个子区域的像素的亮度进行检测，从而得到每个子区域的最大像素亮度M，然后将每个子区域的最大像素亮度M进行求和并计算得到平均值，该平均值即为平均像素亮度A。
本实施例将液晶显示器的背光区域划分为多个子区域，以便对多个子区域的背光亮度分别进行控制。
调整模块102，用于将亮度划分为多个亮度范围，根据所述平均像素亮度A及最大像素亮度M分别调整不同亮度范围的背光源的占空比及驱动电流；
本实施例中，将亮度划分为多个亮度范围，以8比特灰度为例进行说明，在0～255灰度中取两个位于中间的灰度a1、a2（a1<a2），将0～a1划分为低亮范围，a1～a2划分为中亮范围，a2～255划分为高亮范围，本实施例不限定于上述的这种亮度的划分方式，还可以使用其他的方式进行划分。
本实施例中，根据平均像素亮度A及最大像素亮度M分别调整不同亮度范围的背光源的占空比，如上所述，如将亮度划分为3个亮度范围，则分别调整这3个亮度范围对应的占空比，并使得这3个亮度范围对应的占空比增益曲线连续；根据发光二极管的发光特性分别调整这3个亮度范围对应的驱动电流，并使得这3个亮度范围对应的电流曲线连续。
本实施例中，根据平均像素亮度A及最大像素亮度M分别调整不同亮度范围的背光源的占空比及驱动电流，即能够根据液晶显示器当前的画面动态地调整背光源的占空比及驱动电流，从而扩宽发光二极管的发光亮度的范围，进一步提高对比度。
判断模块103，用于根据每个子区域的最大像素亮度M判断所述子区域所处的亮度范围，获取每个子区域所处的亮度范围对应的调整后的占空比及驱动电流；
本实施例中，根据每个子区域的最大像素亮度M判断该子区域所处的亮度范围，判断其属于低亮范围、中亮范围还是高亮范围，然后根据其所处的亮度范围获取对应的调整后的占空比及驱动电流。
本实施例将亮度划分为多个亮度范围，判断每个子区域所处的亮度范围，以便对不同亮度范围的的子区域的背光亮度分别进行控制。
控制模块104，用于利用所述调整后的占空比及驱动电流对应地控制每个子区域的发光亮度。
本实施例中，在利用所述调整后的占空比控制每个子区域的发光亮度时，将所述调整后的占空比存储于至少一个驱动IC寄存器中，通过所述驱动IC寄存器输出所述占空比对应的波形信号控制每个子区域的发光亮度。
进一步地，当液晶显示器的主IC产生的垂直同步信号VSYNC的上升沿到来时，主IC就开始采集图像信息并通过SPI接口发送图像信息给处理器，处理器调整图像信息的占空比，将调整后的占空比存储于一个驱动或多个IC寄存器中，从而IC寄存器输出不同占空比的波形信号以达到控制发光二极管的发光亮度，从而控制每个子区域的显示亮度。
本实施例中，不仅根据每个子区域画面的亮度动态调整占空比，还根据发光二极管的发光特性，动态调整发光二极管的驱动电流，使得背光源在暗场景下还可以进行拓展，且在亮场景下可以短时间提高亮度，这样就能扩大动态亮度的范围，进一步提高动态画面的对比度，增强显示效果。
在一优选的实施例中，如图5所示，在上述图4的实施例的基础上，所述调整模块102包括：
占空比调整单元1021，用于根据所述平均像素亮度A及最大像素亮度M并采用第一算法调整不同亮度范围的所述背光源的占空比；
驱动电流调整单元1022，用于根据所述平均像素亮度A及最大像素亮度M并采用第二算法调整不同亮度范围的所述背光源的驱动电流。
本实施例中，所划分的亮度范围优选地包括第一亮度范围、第二亮度范围及第三亮度范围，所述第一亮度范围、第二亮度范围及第三亮度范围中的亮度依次递增，也可以理解为亮度范围优选地包括低亮度范围、中亮度范围及高亮度范围。采用第一算法调整第一亮度范围、第二亮度范围及第三亮度范围的背光源的占空比时及驱动电流时，在第一亮度范围，使占空比有增益，这样提高驱动电流有利于提高对比度；在第二亮度范围，使占空比呈现非线性，灰度分布越均匀，则驱动电流就越小，这样驱动电路的电压就会下降，那么功耗就下降；在第三亮度范围，使占空比恒定不变，灰度分布越均匀，说明画面越亮，画面细节少，那么驱动电流就需要削减，这样驱动电路的电压同样会下降，功耗就下降。
在一优选的实施例中，上述图5的实施例中的占空比调整单元1021包括：
第一调整子单元，用于当为第一亮度范围时，所述背光源的第一占空比P1= B1*（M+f(A)），其中，所述B1为第一占空比调整系数，B1>1，f(A)为以平均像素亮度A为变量的修正函数，当输入图像的画面为100%黑场画面时，则要求关闭背光，那么对应子区域的占空比为0；
第二调整子单元，用于当为第二亮度范围时，所述背光源的第二占空比P2= B2* M，其中，所述B2为第二占空比调整系数，1<B2<2；
第三调整子单元，用于当为第三亮度范围时，所述背光源的第三占空比P3为所述背光源的最大占空比。
本实施例中，通过调配第一占空比调整系数B1、第二占空比调整系数B2及修正函数f(A)的值，使得第一亮度范围、第二亮度范围及第三亮度范围的占空比增益曲线连续。
在一优选的实施例中，请结合参阅图3，图3为发光二极管的发光特性示意图，在给定直流驱动电流时，发光二极管工作后很快达到饱和区并保持稳定，发光亮度维持固定。即发光二极管的发光特性为若输入不同的电流值，发光亮度会有所不同，但若输入超出额定值的电流时，发光二极管会在短时间内发光亮度超过额定状态的亮度，然后再慢慢回落到饱和区，并保持发光亮度固定。利用发光二极管的这种特性，可对背光源的驱动电流进行调整，上述图5的实施例中的驱动电流调整单元1022包括：
第四调整子单元，用于当为第一亮度范围时，背光源的第一驱动电流I1为所述背光源的最大驱动电流I，最大驱动电流I是规格书上的最大电流值；
第五调整子单元，用于当为第二亮度范围时，所述背光源的第二驱动电流I2=C1*I+f(M，A)，其中，所述C1为第一电流调整系数，0<C1<1，f(M，A)>0，f(M，A) 为以平均像素亮度A及最大像素亮度M为变量的函数，当子区域的画面的最大像素亮度M与平均像素亮度A的差值越大，说明该子区域的灰度分布越离散，C1、f(M，A)就越大；反之，当子区域的画面的最大像素亮度M与平均像素亮度A的差值越小，说明该子区域的灰度分布越均匀，C1、f(M，A)就越小；
第六调整子单元，用于当为第三亮度范围时，所述背光源的第三驱动电流I3=I+ f(M，A)，其中，f(M，A)≤0，f(M，A) 也是以平均像素亮度A及最大像素亮度M为变量的函数，只是取值范围不同，当子区域的画面的最大像素亮度M与平均像素亮度A的差值越大，说明该子区域的灰度分布越离散，f(M，A)越大；反之f(M，A)就越小。
本实施例通过调配第一电流调整系数C1、f(M，A)的值，使得第一亮度范围、第二亮度范围及第三亮度范围的电流曲线连续。
以上仅为本发明的优选实施例，并非因此限制本发明的专利范围，凡是利用本发明说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本发明的专利保护范围内。

Claims (14)

  1. 一种调整背光亮度的方法，其特征在于，所述调整背光亮度的方法包括以下步骤：
    将液晶显示器的背光区域划分为多个子区域，并获取每个子区域的最大像素亮度M，根据所述最大像素亮度M获取平均像素亮度A；
    将亮度划分为多个亮度范围，根据所述平均像素亮度A及最大像素亮度M分别调整不同亮度范围的背光源的占空比及驱动电流；
    根据每个子区域的最大像素亮度M判断所述子区域所处的亮度范围，获取每个子区域所处的亮度范围对应的调整后的占空比及驱动电流；
    利用所述调整后的占空比及驱动电流对应地控制每个子区域的发光亮度。
  2. 如权利要求1所述的调整背光亮度的方法，其特征在于，所述将液晶显示器的背光区域划分为多个子区域，并获取每个子区域的最大像素亮度M，根据所述最大像素亮度M获取平均像素亮度A的步骤包括：
    将液晶显示器的背光区域划分为多个子区域，对每个子区域的像素的亮度进行检测，根据输入画面获取每个子区域内的发光二极管的最大像素亮度M；
    将每个子区域的最大像素亮度M进行求和并计算得到平均值，以所述平均值作为所述平均像素亮度A。
  3. 如权利要求1所述的调整背光亮度的方法，其特征在于，所述亮度范围包括第一亮度范围、第二亮度范围及第三亮度范围，所述第一亮度范围、第二亮度范围及第三亮度范围中的亮度依次递增，所述将亮度划分为多个亮度范围，根据所述平均像素亮度A及最大像素亮度M分别调整不同亮度范围的背光源的占空比及驱动电流的步骤包括：
    根据所述平均像素亮度A及最大像素亮度M并采用第一算法调整不同亮度范围的所述背光源的占空比；
    根据所述平均像素亮度A及最大像素亮度M并采用第二算法调整不同亮度范围的所述背光源的驱动电流。
  4. 如权利要求3所述的调整背光亮度的方法，其特征在于，所述根据所述平均像素亮度A及最大像素亮度M并采用第一算法调整不同亮度范围的所述背光源的占空比的步骤包括：
    当为第一亮度范围时，所述背光源的第一占空比P1= B1*（M+f(A)），其中，所述B1为第一占空比调整系数，B1>1；
    当为第二亮度范围时，所述背光源的第二占空比P2= B2* M，其中，所述B2为第二占空比调整系数，1<B2<2；
    当为第三亮度范围时，所述背光源的第三占空比P3为所述背光源的最大占空比。
  5. 如权利要求4所述的调整背光亮度的方法，其特征在于，当输入画面为100%黑场画面时，将所述背光源关闭，所述背光源的第一占空比P1=0。
  6. 如权利要求3所述的调整背光亮度的方法，其特征在于，所述根据所述平均像素亮度A及最大像素亮度M并采用第二算法调整不同亮度范围的所述背光源的驱动电流的步骤包括：
    当为第一亮度范围时，所述背光源的第一驱动电流I1为所述背光源的最大驱动电流I；
    当为第二亮度范围时，所述背光源的第二驱动电流I2=C1*I+f(M，A)，其中，所述C1为第一电流调整系数，0<C1<1，f(M，A)>0
    当为第三亮度范围时，所述背光源的第三驱动电流I3=I+ f(M，A)，其中，f(M，A)≤0。
  7. 如权利要求1-6任一项所述的调整背光亮度的方法，其特征在于，在利用所述调整后的占空比控制每个子区域的发光亮度时，将所述调整后的占空比存储于至少一个驱动IC寄存器中，通过所述驱动IC寄存器输出所述占空比对应的波形信号控制每个子区域的发光亮度。
  8. 一种调整背光亮度的装置，其特征在于，所述装置包括：
    获取模块，用于将液晶显示器的背光区域划分为多个子区域，并获取每个子区域的最大像素亮度M，根据所述最大像素亮度M获取平均像素亮度A；
    调整模块，用于将亮度划分为多个亮度范围，根据所述平均像素亮度A及最大像素亮度M分别调整不同亮度范围的背光源的占空比及驱动电流；
    判断模块，用于根据每个子区域的最大像素亮度M判断所述子区域所处的亮度范围，获取每个子区域所处的亮度范围对应的调整后的占空比及驱动电流；
    控制模块，用于利用所述调整后的占空比及驱动电流对应地控制每个子区域的发光亮度。
  9. 如权利要求8所述的调整背光亮度的装置，其特征在于，所述获取模块具体用于将液晶显示器的背光区域划分为多个子区域，对每个子区域的像素的亮度进行检测，根据输入画面获取每个子区域内的发光二极管的最大像素亮度M；将每个子区域的最大像素亮度M进行求和并计算得到平均值，以所述平均值作为所述平均像素亮度A。
  10. 如权利要求8所述的调整背光亮度的装置，其特征在于，所述亮度范围包括第一亮度范围、第二亮度范围及第三亮度范围，所述第一亮度范围、第二亮度范围及第三亮度范围中的亮度依次递增，所述调整模块包括：
    占空比调整单元，用于根据所述平均像素亮度A及最大像素亮度M并采用第一算法调整不同亮度范围的所述背光源的占空比；
    驱动电流调整单元，用于根据所述平均像素亮度A及最大像素亮度M并采用第二算法调整不同亮度范围的所述背光源的驱动电流。
  11. 如权利要求10所述的调整背光亮度的装置，其特征在于，所述占空比调整单元包括：
    第一调整子单元，用于当为第一亮度范围时，所述背光源的第一占空比P1= B1*（M+f(A)），其中，所述B1为第一占空比调整系数，B1>1；
    第二调整子单元，用于当为第二亮度范围时，所述背光源的第二占空比P2= B2* M，其中，所述B2为第二占空比调整系数，1<B2<2；
    第三调整子单元，用于当为第三亮度范围时，所述背光源的第三占空比P3为所述背光源的最大占空比。
  12. 如权利要求11所述的调整背光亮度的装置，其特征在于，所述第一调整子单元还用于当输入画面为100%黑场画面时，将所述背光源关闭，所述背光源的第一占空比P1=0。
  13. 如权利要求10所述的调整背光亮度的装置，其特征在于，所述驱动电流调整单元包括：
    第四调整子单元，用于当为第一亮度范围时，所述背光源的第一驱动电流I1为所述背光源的最大驱动电流I；
    第五调整子单元，用于当为第二亮度范围时，所述背光源的第二驱动电流I2=C1*I+f(M，A)，其中，所述C1为第一电流调整系数，0<C1<1，f(M，A)>0
    第六调整子单元，用于当为第三亮度范围时，所述背光源的第三驱动电流I3=I+ f(M，A)，其中，f(M，A)≤0。
  14. 如权利要求8-13任一项所述的调整背光亮度的装置，其特征在于，所述控制模块具体用于在利用所述调整后的占空比控制每个子区域的发光亮度时，将所述调整后的占空比存储于至少一个驱动IC寄存器中，通过所述驱动IC寄存器输出所述占空比对应的波形信号控制每个子区域的发光亮度。
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