WO2021022704A1 - 液晶显示器及其图像显示方法、背光控制装置 - Google Patents

液晶显示器及其图像显示方法、背光控制装置 Download PDF

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WO2021022704A1
WO2021022704A1 PCT/CN2019/117315 CN2019117315W WO2021022704A1 WO 2021022704 A1 WO2021022704 A1 WO 2021022704A1 CN 2019117315 W CN2019117315 W CN 2019117315W WO 2021022704 A1 WO2021022704 A1 WO 2021022704A1
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pixel unit
max
pixel
dimming
dimming coefficient
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PCT/CN2019/117315
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English (en)
French (fr)
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朱江
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Tcl华星光电技术有限公司
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Priority to US16/625,715 priority Critical patent/US11308895B2/en
Publication of WO2021022704A1 publication Critical patent/WO2021022704A1/zh

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    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34Control 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
    • G09G3/3406Control of illumination source
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34Control 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
    • G09G3/3406Control of illumination source
    • G09G3/342Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34Control 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
    • G09G3/36Control 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
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34Control 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
    • G09G3/36Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611Control of matrices with row and column drivers
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00Control of display operating conditions
    • G09G2320/06Adjustment of display parameters
    • G09G2320/0626Adjustment of display parameters for control of overall brightness
    • G09G2320/0646Modulation of illumination source brightness and image signal correlated to each other
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00Control of display operating conditions
    • G09G2320/06Adjustment of display parameters
    • G09G2320/066Adjustment of display parameters for control of contrast
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00Aspects of the architecture of display systems
    • G09G2360/16Calculation or use of calculated indices related to luminance levels in display data

Definitions

  • This application relates to the field of display technology, and in particular to a liquid crystal display, an image display method thereof, and a backlight control device.
  • LCD TVs have entered thousands of households, and people have higher and higher requirements for the display effect of LCD TVs.
  • the purpose of this application is to provide a liquid crystal display, an image display method thereof, and a backlight control device, which have high contrast when displaying images.
  • a liquid crystal display comprising a backlight module, a backlight control device and a liquid crystal display panel, the backlight control device is located between the backlight module and the liquid crystal display panel,
  • the backlight module is used to output a first light signal
  • the backlight control device is used to receive the image signal and the first light signal, divide the image into a plurality of pixel units (j, i), and perform pixel information of the plurality of pixel units (j, i) Analyzing to correspondingly output multiple dimming coefficients, and adjusting the first optical signal according to the multiple dimming coefficients to output multiple second optical signals;
  • the liquid crystal display panel is configured to receive a plurality of the second light signals to display an image corresponding to the image signal;
  • each pixel unit (j, i) includes at least one pixel, each pixel unit (j, i) corresponds to one dimming coefficient, and the j represents the pixel unit (j, i) In the row, the i represents the column of the pixel unit (j, i).
  • the backlight control device includes a processor and a plurality of backlight control units.
  • the processor is configured to receive the image signal and divide the image into a plurality of pixel units (j, i).
  • the pixel information of each pixel unit (j, i) is analyzed to correspondingly output a plurality of the dimming coefficients, and each backlight control unit is used to adjust the first light signal according to one dimming coefficient to Correspondingly output one said second optical signal.
  • the processor includes a first dimming coefficient output unit, and the first dimming coefficient output unit is configured to receive the image signal and divide the image into a plurality of the pixel units (j , I), Y max Calculate the maximum gray scale value Y max of each pixel unit (j, i) and the average brightness value Y av of each pixel unit (j, i), according to the following formula (1) Calculate the first dimming coefficient L(j,i) corresponding to each pixel unit (j,i),
  • the first dimming coefficient L(j, i) is the dimming coefficient corresponding to each pixel unit (j, i).
  • the processor includes a first dimming coefficient output unit and a spatial filter
  • the first dimming coefficient output unit is configured to receive the image signal and divide the image into a plurality of the Pixel unit (j, i), calculate the maximum gray scale value Y max of each pixel unit (j, i) and the average brightness value Y av of each pixel unit (j, i), according to the following formula ( 1) Calculate the first dimming coefficient L(j,i) corresponding to each pixel unit (j,i),
  • the spatial filter is used to spatially filter the first dimming coefficient L(j, i) corresponding to each pixel unit (j, i) to output the corresponding pixel unit (j, i)
  • the second dimming coefficient L fin (j, i) of, and the second dimming coefficient L fin (j, i) is the dimming coefficient corresponding to each pixel unit (j, i).
  • the spatial filter includes a neighborhood dimming coefficient maximum value calculation unit, a smoothing factor calculation unit, and a second dimming coefficient output unit,
  • the maximum neighborhood dimming coefficient calculation unit is used to calculate the maximum neighborhood dimming coefficient N max of the pixel unit (j, i) according to the following formula (2),
  • N max max(L(j-1,i-1),L(j-1,i),L(j-1,i+1),L(j,i-1),L(j,i +1),L(j+1,i-1),L(j+1,i),L(j+1,i+1)) (2),
  • the L(j-1, i-1) represents the first dimming coefficient of the pixel unit (j-1, i-1), and the L(j-1, i) represents the pixel unit (j-1 , I) the first dimming coefficient
  • the L(j-1, i+1) represents the first dimming coefficient of the pixel unit (j-1, i+1)
  • the L(j, i-1) ) Represents the first dimming coefficient of the pixel unit (j, i-1)
  • the L(j, i+1) represents the first dimming coefficient of the pixel unit (j, i+1)
  • the L(j +1, i-1) represents the first dimming coefficient of the pixel unit (j+1, i-1)
  • the L(j+1, i) represents the first dimming coefficient of the pixel unit (j+1, i)
  • Light coefficient, said L(j+1, i+1) represents the first dimming coefficient of the pixel unit (j+1, i+1);
  • the smoothing factor calculation unit is used to calculate the smoothing factor sf max of the pixel unit (j, i) according to the following formula (3),
  • the tsf is a control coefficient
  • the tsf is a constant and has a value range of 0-1
  • the N max is the maximum value of the neighborhood dimming coefficient of the pixel unit (j, i);
  • the second dimming coefficient output unit is used to calculate the second dimming coefficient L fin (j, i) of the pixel unit (j, i) according to the following formula (4),
  • the L(j, i) represents the first dimming coefficient of the pixel unit (j, i), and the sf max represents the smoothing factor of the pixel unit (j, i).
  • the liquid crystal display panel includes a plurality of image display pixel units, each of the image display pixel units includes at least one image display pixel, and the image display pixel unit corresponds to the backlight control unit one-to-one and The second light signal corresponding to the output of the backlight control unit is received, and the image display pixels are in one-to-one correspondence with the pixels of the image.
  • each of the image display pixel units includes four of the image display pixels, and each of the pixel units (j, i) includes four of the pixels.
  • the backlight control device includes a liquid crystal panel, and the liquid crystal panel includes a plurality of the backlight control units.
  • An image display method of a liquid crystal display including a backlight module, a backlight control device and a liquid crystal display panel, the backlight control device is located between the backlight module and the liquid crystal display panel, the method includes The following steps:
  • the backlight module outputs a first light signal
  • the backlight control device receives the image signal and the first light signal, divides the image into a plurality of pixel units (j, i), and analyzes the pixel information of the plurality of pixel units (j, i) to Correspondingly outputting a plurality of dimming coefficients, and adjusting the first optical signal according to the plurality of dimming coefficients to output a plurality of second optical signals;
  • the liquid crystal display panel receives a plurality of the second light signals to display an image corresponding to the image signal
  • each pixel unit (j, i) includes at least one pixel, each pixel unit (j, i) corresponds to one dimming coefficient, and the j represents the pixel unit (j, i) In the row, the i represents the column of the pixel unit (j, i).
  • the backlight control device includes a processor and a plurality of backlight control units, and the processor receives the image signal and divides the image into a plurality of pixel units (j, i) Analyzing the pixel information of multiple pixel units (j, i) to correspondingly output multiple dimming coefficients, and each of the backlight control units adjusts the first light signal according to one dimming coefficient To correspondingly output one of the second optical signals.
  • a backlight control device the backlight control device is used to receive an image signal and a first light signal, divide the image into a plurality of pixel units (j, i), for the plurality of pixel units (j, i) Analyze the pixel information to output multiple dimming coefficients correspondingly, and adjust the first light signal according to the multiple dimming coefficients to output multiple second light signals,
  • each pixel unit (j, i) includes at least one pixel, each pixel unit (j, i) corresponds to one dimming coefficient, and the j represents the pixel unit (j, i) In the row, the i represents the column of the pixel unit (j, i).
  • the backlight control device includes a processor and a plurality of backlight control units, and the processor is configured to receive the image signal, divide the image into a plurality of pixel units (j, i), The pixel information of the plurality of pixel units (j, i) is analyzed to correspondingly output a plurality of the dimming coefficients, and each of the backlight control units is used to adjust the first light signal according to one dimming coefficient To correspondingly output one of the second optical signals.
  • the processor includes a first dimming coefficient output unit, and the first dimming coefficient output unit is configured to receive the image signal and divide the image into a plurality of the pixel units ( j, i), calculate the maximum grayscale value Y max of each pixel unit (j, i) and the average brightness Y av of each pixel unit (j, i), and calculate according to the following formula (1) Get the first dimming coefficient L(j, i) corresponding to each pixel unit (j, i),
  • the first dimming coefficient L(j, i) is the dimming coefficient corresponding to each pixel unit (j, i).
  • the processor includes a first dimming coefficient output unit and a spatial filter, and the first dimming coefficient output unit is configured to receive the image signal and divide the image into a plurality of For the pixel unit (j, i), calculate the maximum gray scale value Y max of each pixel unit (j, i) and the brightness average value Y av of each pixel unit (j, i) according to the following formula (1) Calculate the first dimming coefficient L(j, i) corresponding to each pixel unit (j, i),
  • the spatial filter is used to spatially filter the first dimming coefficient L(j, i) corresponding to each pixel unit (j, i) to output the corresponding pixel unit (j, i)
  • the second dimming coefficient L fin (j, i) of, and the second dimming coefficient L fin (j, i) is the dimming coefficient corresponding to each pixel unit (j, i).
  • the spatial filter includes a neighborhood dimming coefficient maximum value calculation unit, a smoothing factor calculation unit, and a second dimming coefficient output unit,
  • the maximum neighborhood dimming coefficient calculation unit is used to calculate the maximum neighborhood dimming coefficient N max of the pixel unit (j, i) according to the following formula (2),
  • N max max(L(j-1,i-1),L(j-1,i),L(j-1,i+1),L(j,i-1),L(j,i +1),L(j+1,i-1),L(j+1,i),L(j+1,i+1)) (2),
  • the L(j-1, i-1) represents the first dimming coefficient of the pixel unit (j-1, i-1), and the L(j-1, i) represents the pixel unit (j-1 , I) the first dimming coefficient
  • the L(j-1, i+1) represents the first dimming coefficient of the pixel unit (j-1, i+1)
  • the L(j, i-1) ) Represents the first dimming coefficient of the pixel unit (j, i-1)
  • the L(j, i+1) represents the first dimming coefficient of the pixel unit (j, i+1)
  • the L(j +1, i-1) represents the first dimming coefficient of the pixel unit (j+1, i-1)
  • the L(j+1, i) represents the first dimming coefficient of the pixel unit (j+1, i)
  • Light coefficient, said L(j+1, i+1) represents the first dimming coefficient of the pixel unit (j+1, i+1);
  • the smoothing factor calculation unit is used to calculate the smoothing factor sf max of the pixel unit (j, i) according to the following formula (3),
  • the tsf is a control coefficient
  • the tsf is a constant and has a value range of 0-1
  • the N max is the maximum value of the neighborhood dimming coefficient of the pixel unit (j, i);
  • the second dimming coefficient output unit is used to calculate the second dimming coefficient L fin (j, i) of the pixel unit (j, i) according to the following formula (4),
  • the L(j,i) represents the first dimming coefficient of the pixel unit (j,i), and the sfmax represents the smoothing factor of the pixel unit (j,i).
  • the backlight control device includes a liquid crystal panel, and the liquid crystal panel includes a plurality of the backlight control units.
  • This application provides a liquid crystal display, an image display method thereof, and a backlight control device.
  • the backlight control device is arranged between the backlight module and the liquid crystal display panel.
  • the backlight control device divides the image into a plurality of pixel units, and calculates each pixel unit According to the corresponding dimming coefficient, the first light signal output by the backlight module is adjusted according to the plurality of dimming coefficients to output a plurality of second light signals to achieve the purpose of partition dimming, thereby improving the contrast of the liquid crystal display when displaying images.
  • FIG. 1 is a schematic structural diagram of a liquid crystal display according to an embodiment of the application.
  • FIG. 2 is a schematic diagram of the correspondence between image display pixel units and backlight control units in the liquid crystal display shown in FIG. 1;
  • FIG. 3 is a flowchart of an image display method of a liquid crystal display according to an embodiment of the application.
  • FIG. 1 is a schematic structural diagram of a liquid crystal display according to an embodiment of the application.
  • the liquid crystal display 100 includes a backlight module 10, a backlight control device 20 and a liquid crystal display panel 30, and the backlight control device 20 is located between the backlight module 10 and the liquid crystal display panel 30.
  • the backlight module 10 is used to output the first light signal.
  • the backlight module 10 includes a light guide plate, an optical film located on the light emitting surface of the light guide plate, and a light emitting diode located on the light incident surface of the light guide plate.
  • the light-emitting diode is used as a point light source to enter the light into the light guide plate.
  • the light guide plate converts the light emitted by the light-emitting diode into a surface light source and emits it from the light exit surface.
  • the light emitted from the light guide plate is processed by the optical film and converted into a first light signal.
  • the backlight control device 20 is used to receive the image signal and the first light signal, and divide the image into a plurality of pixel units (j, i), each pixel unit (j, i) includes at least one pixel, and each pixel unit ( j, i) corresponding to a dimming coefficient, analyzing the pixel information of multiple pixel units (j, i) to correspondingly output multiple dimming coefficients, and adjust the first light signal according to the multiple dimming coefficients to output A plurality of second light signals, j represents the row of the pixel unit (j, i), and i represents the column of the pixel unit (j, i).
  • the liquid crystal display panel 30 is used for receiving a plurality of second light signals to display images corresponding to the image signals.
  • the liquid crystal display of this application is provided with a backlight control device between the backlight module and the liquid crystal display panel.
  • the backlight control device divides the image into a plurality of pixel units, calculates the dimming coefficient corresponding to each pixel unit, and according to the multiple dimming coefficients
  • the first light signal output by the backlight module is adjusted to output a plurality of second light signals to achieve the purpose of zone dimming, thereby improving the contrast of the liquid crystal display when displaying images.
  • the partition dimming the power consumption of the liquid crystal display can be reduced.
  • the screen displayed on the liquid crystal display can have a contrast of millions.
  • a liquid crystal display which includes a backlight module, a liquid crystal display panel, and a backlight control device.
  • the resolution of the liquid crystal display panel is 3840 ⁇ RGB ⁇ 2160, and the resolution of the backlight control device is 1920 ⁇ 1080.
  • the backlight control device includes a processor and a plurality of backlight control units.
  • the processor is used to receive the image signal, divide the image signal into multiple pixel units (j, i), analyze the pixel information of the multiple pixel units (j, i) to correspondingly output multiple dimming coefficients, j represents the pixel unit (j, i) is in the row, and i represents the column of the pixel unit (j, i).
  • Each backlight control unit is used to adjust the first light signal according to a dimming coefficient to correspondingly output a second light signal.
  • the processor includes a first dimming coefficient output unit, which is used to receive an image signal, divide the image into a plurality of pixel units (j, i), and calculate the maximum value of each pixel unit (j, i)
  • the gray scale value Y max and the average brightness value Ya v of each pixel unit (j, i) are calculated according to the following formula (1) to calculate the first dimming coefficient L(j, i),
  • the physical meaning of the above formula (1) is that when the brightness of a pixel in each pixel unit (j, i) is high, the brightness of the backlight (the second light signal) is high to ensure that the pixel unit (j, i) The highest brightness in the middle is not lost; when the brightness of the pixels in each pixel unit (j, i) is low, the brightness of the backlight (the second light signal) is low to ensure that the dark state is darker.
  • each pixel unit (j, i) includes four pixels. Calculate the maximum value Y max of the gray scale values of the four pixels, and calculate the average value Y av of the brightness of the four pixels, and obtain the weighting coefficient ⁇ according to the relationship between the weighting coefficient ⁇ and the maximum value Y max of the gray scale values of the four pixels , And substitute the weighting coefficients ⁇ , Y max, and Y av into formula (1) to obtain the first dimming coefficient L(j, i) of each pixel unit (j, i).
  • the backlight control unit corresponds to the pixel unit one to one.
  • Each backlight control unit adjusts the first light signal according to a dimming coefficient to correspondingly output a second light signal.
  • the first dimming coefficient L(j, i) is the dimming coefficient corresponding to each pixel unit (j, i).
  • the backlight control unit corresponding to the pixel unit (j, i) transmits all the light quantity of the first light signal through the The backlight control unit enables the backlight control unit to output the second light signal, that is, complete light transmission; when the first dimming coefficient L(j, i) corresponding to the pixel unit (j, i) is 511, the pixel unit (j, i) ) The corresponding backlight control unit transmits half of the light quantity of the first light signal through the backlight control unit so that the backlight control unit outputs the second light signal; the first dimming coefficient L(j) corresponding to the pixel unit (j, i) When i) is 0, the backlight control unit corresponding to the pixel unit (j, i) prevents the first light signal from passing through the backlight control unit, that is, the backlight control unit does not transmit light at all.
  • the same proportional analogy can be performed to obtain the first dimming coefficient L
  • the second optical signal and the first optical signal when the value of (j, i) is between 1023-0.
  • the backlight control device may include a liquid crystal panel, the liquid crystal panel including the above-mentioned multiple backlight control units, the liquid crystal panel plays a role of filtering light, that is, filtering the first light signal emitted by the backlight module to A plurality of second optical signals are output.
  • the difference between the liquid crystal panel and the ordinary liquid crystal display panel is that the liquid crystal panel does not have a color film layer, but only functions to adjust the light transmittance of the light emitted by the backlight module.
  • the plurality of backlight control units may also be composed of other structures with filtering functions.
  • the liquid crystal display panel includes a plurality of image display pixel units, each image display pixel unit includes at least one image display pixel, each image display unit corresponds to the backlight control unit one-to-one and receives the second light signal corresponding to the backlight control unit, that is, the image
  • the display unit corresponds to the pixel unit one-to-one
  • the image display pixel corresponds to the image pixel one-to-one.
  • each image display pixel unit 31 includes four image display pixels 310, the four image display pixels 310 correspond to one backlight control unit 21, and each image display pixel 310 includes a red image display. Pixel R, a green image display pixel G, and a blue image display pixel B.
  • Each image display pixel unit on the liquid crystal display panel receives the second light signal output by the corresponding backlight control unit to display the pixel information of the pixel unit corresponding to the image display pixel unit.
  • This embodiment provides a liquid crystal display.
  • the liquid crystal display of this embodiment is basically similar to the liquid crystal display of the first embodiment, except that the processor includes a first dimming coefficient output unit and a spatial filter, and the first dimming coefficient output
  • the unit is used to receive the image signal, divide the image into multiple pixel units (j, i), calculate the maximum gray scale value Y max of each pixel unit (j, i) and the brightness of each pixel unit (j, i)
  • the average value Y av is calculated according to the following formula (1) to calculate the first dimming coefficient L(j, i) corresponding to each pixel unit (j, i),
  • the spatial filter is used to spatially filter the first dimming coefficient L(j, i) corresponding to each pixel unit (j, i) to output the second dimming coefficient L fin corresponding to each pixel unit (j, i) (j, i).
  • the spatial filter includes a neighborhood dimming coefficient maximum value calculation unit, a smoothing factor calculation unit, and a second dimming coefficient output unit,
  • the maximum neighborhood dimming coefficient calculation unit is used to calculate the maximum neighborhood dimming coefficient N max of the pixel unit (j, i) according to the following formula (2),
  • N max max(L(j-1,i-1),L(j-1,i),L(j-1,i+1),L(j,i-1),L(j,i +1),L(j+1,i-1),L(j+1,i),L(j+1,i+1)) (2),
  • L(j-1, i-1) represents the first dimming coefficient of the pixel unit (j-1, i-1), and L(j-1, i) represents the pixel unit (j-1, i)
  • the first dimming coefficient, L(j-1, i+1) represents the first dimming coefficient of the pixel unit (j-1, i+1)
  • L(j, i-1) represents the pixel unit (j, i -1) the first dimming coefficient
  • L(j, i+1) represents the first dimming coefficient of the pixel unit (j, i+1)
  • L(j+1, i-1) represents the pixel unit (j +1, i-1) the first dimming coefficient
  • L(j+1, i) represents the first dimming coefficient of the pixel unit (j+1, i)
  • L(j+1, i+1) represents The first dimming coefficient of the pixel unit (j+1, i+1);
  • the smoothing factor calculation unit is used to calculate the smoothing factor sf max of the pixel unit (j, i) according to the following formula (3),
  • tsf is the control coefficient, tsf is a constant and the value range is 0-1, N max is the maximum value of the neighborhood dimming coefficient of the pixel unit (j, i),
  • the second dimming coefficient output unit is used to calculate the second dimming coefficient L fin (j, i) of the pixel unit (j, i) according to the following formula (4),
  • L(j, i) represents the first dimming coefficient of the pixel unit (j, i)
  • sf max represents the smoothing factor of the pixel unit (j, i).
  • the liquid crystal display of the second embodiment obtains a plurality of second dimming coefficients by spatially filtering the plurality of first dimming coefficients, so as to improve the viewing angle of the liquid crystal display when displaying images.
  • the liquid crystal display includes a backlight module, a backlight control device, and a liquid crystal display panel.
  • the backlight control device is located between the backlight module and the liquid crystal display panel.
  • the method includes the following steps:
  • the backlight module outputs the first light signal
  • the backlight control device receives the image signal and the first light signal, divides the image into multiple pixel units (j, i), and analyzes the pixel information of the multiple pixel units (j, i) to correspondingly output multiple dimming Coefficient, and adjust the first optical signal according to the multiple dimming coefficients to output multiple second optical signals;
  • Each pixel unit (j, i) includes at least one pixel, and each pixel unit (j, i) corresponds to a dimming coefficient, j represents the row of the pixel unit (j, i), and i represents the pixel unit (j, i) The column.
  • the backlight control device includes a processor and a plurality of backlight control units.
  • the processor receives image signals and divides the image into a plurality of pixel units (j, i).
  • the pixel information is analyzed to correspondingly output multiple dimming coefficients, and each backlight control unit adjusts the first light signal according to one dimming coefficient to correspondingly output a second light signal.
  • the processor includes a first dimming coefficient output unit, which receives an image signal, divides the image into a plurality of the pixel units (j, i), and calculates each pixel
  • the maximum grayscale value Y max of unit (j, i) and the average brightness value Y av of each pixel unit (j, i) are calculated according to the following formula (1) to calculate the first corresponding pixel unit (j, i)
  • the first dimming coefficient L(j, i) is the dimming coefficient corresponding to each pixel unit (j, i).
  • the processor further includes a spatial filter, and the spatial filter is used to spatially filter the first dimming coefficient L(j, i) corresponding to each pixel unit (j, i) to output each The second dimming coefficient L fin (j, i) corresponding to the pixel unit (j, i), and the second dimming coefficient L fin (j, i) is the dimming coefficient corresponding to each pixel unit (j, i).
  • the image display method of the liquid crystal display of this application is to provide a backlight control device between the backlight module and the liquid crystal display panel.
  • the backlight control device divides the image into a plurality of pixel units, calculates the dimming coefficient corresponding to each pixel unit, and calculates the dimming coefficient according to the A dimming coefficient adjusts the first light signal output by the backlight module to output a plurality of second light signals to achieve the purpose of partition dimming, thereby improving the contrast of the liquid crystal display when displaying images.
  • This embodiment provides a backlight control device, which is used to receive an image signal and a first light signal, and divide the image into a plurality of pixel units (j, i).
  • the pixel information of j, i) is analyzed to correspondingly output multiple dimming coefficients, and the first light signal is adjusted according to the multiple dimming coefficients to output multiple second light signals, where each pixel unit ( j, i) includes at least one pixel, and each pixel unit (j, i) corresponds to a dimming coefficient, j represents the row of the pixel unit (j, i), and i represents the column of the pixel unit (j, i).
  • the backlight control device of this embodiment divides the image into multiple pixel units, calculates the dimming coefficient corresponding to each pixel unit, and adjusts the first light signal input to the backlight control unit according to the multiple dimming coefficients to output multiple first light signals.

Abstract

公开了一种液晶显示器及其图像显示方法、背光控制装置。该液晶显示器在背光模组(10)和液晶显示面板(30)之间设置背光控制装置(20),背光控制装置(20)将图像分为多个像素单元,计算每个像素单元对应的调光系数,并根据多个调光系数调整背光模组(10)输出的第一光信号而输出多个第二光信号,以实现分区调光目的,从而提高液晶显示器显示画面时的对比度。

Description

液晶显示器及其图像显示方法、背光控制装置 技术领域
本申请涉及显示技术领域,尤其涉及一种液晶显示器及其图像显示方法、背光控制装置。
背景技术
随着经济技术的发展,液晶电视已走进千家万户,人们对液晶电视的显示效果的要求也越来越高。为了满足消费者对液晶电视的显示效果的要求,需要提高显示画面的对比度,以使显示画面黑的更黑,显示画面白的更白,以提高液晶电视的视觉效果。
因此,有必要提出一种技术方案以提高液晶显示器显示画面时的对比度。
技术问题
本申请的目的在于提供一种液晶显示器及其图像显示方法、背光控制装置,该液晶显示器显示画面时具有高的对比度。
技术解决方案
一种液晶显示器,所述液晶显示器包括背光模组、背光控制装置以及液晶显示面板,所述背光控制装置位于所述背光模组和所述液晶显示面板之间,
所述背光模组用于输出第一光信号;
所述背光控制装置用于接收图像信号和所述第一光信号,将所述图像分为多个像素单元(j,i),对多个所述像素单元(j,i)的像素信息进行分析以对应输出多个调光系数,并根据多个所述调光系数调整所 述第一光信号以输出多个第二光信号;
所述液晶显示面板用于接收多个所述第二光信号以显示所述图像信号对应的图像;
其中,每个所述像素单元(j,i)包括至少一个像素,每个所述像素单元(j,i)对应一个所述调光系数,所述j表示所述像素单元(j,i)所在行,所述i表示所述像素单元(j,i)所在列。
在上述液晶显示器中,所述背光控制装置包括处理器以及多个背光控制单元,所述处理器用于接收所述图像信号,将所述图像分为多个像素单元(j,i),对多个所述像素单元(j,i)的像素信息进行分析以对应输出多个所述调光系数,每个所述背光控制单元用于根据一个所述调光系数调整所述第一光信号以对应输出一个所述第二光信号。
在上述液晶显示器中,所述处理器包括第一调光系数输出单元,所述第一调光系数输出单元用于接收所述图像信号,将所述图像分为多个所述像素单元(j,i),Y max计算每个所述像素单元(j,i)的最大灰阶值Y max以及每个所述像素单元(j,i)的亮度平均值Y av,根据如下公式(1)计算出每个所述像素单元(j,i)对应的第一调光系数L(j,i),
L(j,i)=(1-α)×Y av+αY max    (1),
其中,所述α为加权系数,所述Y max的取值小于等于第一阈值时,所述α等于0,所述Y max的取值大于等于第二阈值时,所述α等于1,所述Y max的取值大于第一阈值且小于第二阈值时,所述α=kY max,所述k为大于0的常数,
所述第一调光系数L(j,i)为每个所述像素单元(j,i)对应的所述调光 系数。
在上述液晶显示器中,所述处理器包括第一调光系数输出单元以及空间滤波器,所述第一调光系数输出单元用于接收所述图像信号,将所述图像分为多个所述像素单元(j,i),计算每个所述像素单元(j,i)的最大灰阶值Y max以及每个所述像素单元(j,i)的亮度平均值Y av,根据如下公式(1)计算出每个所述像素单元(j,i)对应的第一调光系数L(j,i),
L(j,i)=(1-α)×Y av+αY max    (1),
其中,所述α为加权系数,所述Y max的取值小于等于第一阈值时,所述α等于0,所述Y max的取值大于等于第二阈值时,所述α等于1,所述Y max的取值大于第一阈值且小于第二阈值时,所述α=kY max,所述k为大于0的常数,
所述空间滤波器用于对每个所述像素单元(j,i)对应的所述第一调光系数L(j,i)进行空间滤波以输出每个所述像素单元(j,i)对应的第二调光系数L fin(j,i),所述第二调光系数L fin(j,i)为每个所述像素单元(j,i)对应的所述调光系数。
在上述液晶显示器中,所述空间滤波器包括邻域调光系数最大值计算单元、平滑因子计算单元以及第二调光系数输出单元,
所述邻域调光系数最大值计算单元用于根据如下公式(2)计算所述像素单元(j,i)邻域调光系数的最大值N max
N max=max(L(j-1,i-1),L(j-1,i),L(j-1,i+1),L(j,i-1),L(j,i+1),L(j+1,i-1),L(j+1,i),L(j+1,i+1))    (2),
其中,所述L(j-1,i-1)表示像素单元(j-1,i-1)的第一调光系数,所述L(j-1,i)表示像素单元(j-1,i)的第一调光系数,所述L(j-1,i+1)表示像素单元(j-1,i+1)的第一调光系数,所述L(j,i-1)表示像素单元(j,i-1)的第一调光系数,所述L(j,i+1)表示像素单元(j,i+1)的第一调光系数,所述L(j+1,i-1)表示像素单元(j+1,i-1)的第一调光系数,所述L(j+1,i)表示像素单元(j+1,i)的第一调光系数,所述L(j+1,i+1)表示像素单元(j+1,i+1)的第一调光系数;
所述平滑因子计算单元用于根据如下公式(3)计算所述像素单元(j,i)的平滑因子sf max
sf max=(1-tsf)×N max    (3),
其中,所述tsf为调控系数,所述tsf为常数且取值范围为0-1,所述N max为所述像素单元(j,i)邻域调光系数的最大值;
所述第二调光系数输出单元用于根据如下公式(4)计算像素单元(j,i)所述第二调光系数L fin(j,i),
L fin(j,i)=max(L(j,i),sf max)   (4),
所述L(j,i)表示所述像素单元(j,i)的第一调光系数,所述sf max表示所述像素单元(j,i)的平滑因子。
在上述液晶显示器中,所述液晶显示面板包括多个图像显示像素单元,每个所述图像显示像素单元包括至少一个图像显示像素,所述图像显示像素单元与所述背光控制单元一一对应且接收对应所述背光控制单元输出的所述第二光信号,所述图像显示像素与所述图像的像素一一对应。
在上述液晶显示器中,每个所述图像显示像素单元包括四个所述图像显示像素,每个所述像素单元(j,i)包括四个所述像素。
在上述液晶显示器中,所述背光控制装置包括液晶面板,所述液晶面板包括多个所述背光控制单元。
一种液晶显示器的图像显示方法,所述液晶显示器包括背光模组、背光控制装置以及液晶显示面板,所述背光控制装置位于所述背光模组和所述液晶显示面板之间,所述方法包括如下步骤:
所述背光模组输出第一光信号;
所述背光控制装置接收图像信号和所述第一光信号,将所述图像分为多个像素单元(j,i),对多个所述像素单元(j,i)的像素信息进行分析以对应输出多个调光系数,并根据多个所述调光系数调整所述第一光信号以输出多个第二光信号;
所述液晶显示面板接收多个所述第二光信号以显示所述图像信号对应的图像,
其中,每个所述像素单元(j,i)包括至少一个像素,每个所述像素单元(j,i)对应一个所述调光系数,所述j表示所述像素单元(j,i)所在行,所述i表示所述像素单元(j,i)所在列。
在上述液晶显示器的图像显示方法中,所述背光控制装置包括处理器以及多个背光控制单元,所述处理器接收所述图像信号,将所述图像分为多个像素单元(j,i),对多个所述像素单元(j,i)的像素信息进行分析以对应输出多个所述调光系数,每个所述背光控制单元根据一个所述调光系数调整所述第一光信号以对应输出一个所述第二光 信号。
一种背光控制装置,所述背光控制装置用于接收图像信号和第一光信号,将所述图像分为多个像素单元(j,i),对多个所述像素单元(j,i)的像素信息进行分析以对应输出多个调光系数,并根据多个所述调光系数调整所述第一光信号以输出多个第二光信号,
其中,每个所述像素单元(j,i)包括至少一个像素,每个所述像素单元(j,i)对应一个所述调光系数,所述j表示所述像素单元(j,i)所在行,所述i表示所述像素单元(j,i)所在列。
在上述背光控制装置中,所述背光控制装置包括处理器以及多个背光控制单元,所述处理器用于接收所述图像信号,将所述图像分为多个像素单元(j,i),对多个所述像素单元(j,i)的像素信息进行分析以对应输出多个所述调光系数,每个所述背光控制单元用于根据一个所述调光系数调整所述第一光信号以对应输出一个所述第二光信号。
在上述背光控制装置中,所述处理器包括第一调光系数输出单元,所述第一调光系数输出单元用于接收所述图像信号,将所述图像分为多个所述像素单元(j,i),计算每个所述像素单元(j,i)的最大灰阶值Y max以及每个所述像素单元(j,i)的亮度平均值Y av,根据如下公式(1)计算出每个所述像素单元(j,i)对应的第一调光系数L(j,i),
L(j,i)=(1-α)×Y av+αY max     (1),
其中,所述α为加权系数,所述Y max的取值小于等于第一阈值时,所述α等于0,所述Y max的取值大于等于第二阈值时,所述α等于1, 所述Y max的取值大于第一阈值且小于第二阈值时,所述α=kY max,所述k为大于0的常数,
所述第一调光系数L(j,i)为每个所述像素单元(j,i)对应的所述调光系数。
在上述背光控制装置中,所述处理器包括第一调光系数输出单元和空间滤波器,所述第一调光系数输出单元用于接收所述图像信号,将所述图像分为多个所述像素单元(j,i),计算每个所述像素单元(j,i)的最大灰阶值Y max以及每个所述像素单元(j,i)的亮度平均值Y av,根据如下公式(1)计算出每个所述像素单元(j,i)对应的第一调光系数L(j,i),
L(j,i)=(1-α)×Y av+αY max    (1),
其中,所述α为加权系数,所述Y max的取值小于等于第一阈值时,所述α等于0,所述Y max的取值大于等于第二阈值时,所述α等于1,所述Y max的取值大于第一阈值且小于第二阈值时,所述α=kY max,所述k为大于0的常数,
所述空间滤波器用于对每个所述像素单元(j,i)对应的所述第一调光系数L(j,i)进行空间滤波以输出每个所述像素单元(j,i)对应的第二调光系数L fin(j,i),所述第二调光系数L fin(j,i)为每个所述像素单元(j,i)对应的所述调光系数。
在上述背光控制装置中,所述空间滤波器包括邻域调光系数最大值计算单元、平滑因子计算单元以及第二调光系数输出单元,
所述邻域调光系数最大值计算单元用于根据如下公式(2)计算所述像素单元(j,i)邻域调光系数的最大值N max
N max=max(L(j-1,i-1),L(j-1,i),L(j-1,i+1),L(j,i-1),L(j,i+1),L(j+1,i-1),L(j+1,i),L(j+1,i+1))    (2),
其中,所述L(j-1,i-1)表示像素单元(j-1,i-1)的第一调光系数,所述L(j-1,i)表示像素单元(j-1,i)的第一调光系数,所述L(j-1,i+1)表示像素单元(j-1,i+1)的第一调光系数,所述L(j,i-1)表示像素单元(j,i-1)的第一调光系数,所述L(j,i+1)表示像素单元(j,i+1)的第一调光系数,所述L(j+1,i-1)表示像素单元(j+1,i-1)的第一调光系数,所述L(j+1,i)表示像素单元(j+1,i)的第一调光系数,所述L(j+1,i+1)表示像素单元(j+1,i+1)的第一调光系数;
所述平滑因子计算单元用于根据如下公式(3)计算所述像素单元(j,i)的平滑因子sf max
sf max=(1-tsf)×N max   (3),
其中,所述tsf为调控系数,所述tsf为常数且取值范围为0-1,所述N max为所述像素单元(j,i)邻域调光系数的最大值;
所述第二调光系数输出单元用于根据如下公式(4)计算像素单元(j,i)的所述第二调光系数L fin(j,i),
L fin(j,i)=max(L(j,i),sf max)    (4),
所述L(j,i)表示所述像素单元(j,i)的第一调光系数,所述sfmax表示所述像素单元(j,i)的平滑因子。
在上述背光控制装置中,所述背光控制装置包括液晶面板,所述 液晶面板包括多个所述背光控制单元。
有益效果
本申请提供一种液晶显示器及其图像显示方法、背光控制装置,通过在背光模组和液晶显示面板之间设置背光控制装置,背光控制装置将图像分为多个像素单元,计算每个像素单元对应的调光系数,并根据多个调光系数调整背光模组输出的第一光信号而输出多个第二光信号,以实现分区调光目的,从而提高液晶显示器显示画面时的对比度。
附图说明
图1为本申请实施例液晶显示器的结构示意图;
图2为图1所示液晶显示器中图像显示像素单元与背光控制单元的对应关系示意图;
图3为本申请实施例液晶显示器的图像显示方法的流程图。
本发明的实施方式
下面将结合本申请实施例中的附图,对本申请实施例中的技术方案进行清楚、完整地描述。显然,所描述的实施例仅仅是本申请一部分实施例,而不是全部的实施例。基于本申请中的实施例,本领域技术人员在没有作出创造性劳动前提下所获得的所有其他实施例,都属于本申请保护的范围。
请参阅图1,其为本申请实施例液晶显示器的结构示意图。液晶显示器100包括背光模组10、背光控制装置20以及液晶显示面板30, 背光控制装置20位于背光模组10和液晶显示面板30之间。
背光模组10用于输出第一光信号。背光模组10包括导光板、位于导光板出光面的光学膜片以及位于导光板的入光面的发光二极管。发光二极管作为点光源将光入射至导光板,导光板将发光二极管发出的光转换为面光源且从出光面射出,从导光板射出的光经过光学膜片处理转化为第一光信号。
背光控制装置20用于接收图像信号和第一光信号,将所述图像分为多个像素单元(j,i),每个像素单元(j,i)包括至少一个像素,每个像素单元(j,i)对应一个调光系数,对多个所述像素单元(j,i)的像素信息进行分析以对应输出多个调光系数,并根据多个调光系数调整第一光信号以输出多个第二光信号,j表示像素单元(j,i)所在行,i表示像素单元(j,i)所在列。
液晶显示面板30用于接收多个第二光信号以显示图像信号对应的图像。
本申请液晶显示器通过在背光模组和液晶显示面板之间设置背光控制装置,背光控制装置将图像分为多个像素单元,计算每个像素单元对应的调光系数,并根据多个调光系数调整背光模组输出的第一光信号而输出多个第二光信号,以实现分区调光目的,从而提高液晶显示器显示画面时的对比度。同时,由于分区调光,可以降低液晶显示器的使用功耗。另外,分区为百万级时,就可使液晶显示器显示的画面具有百万级的对比度。
以下结合具体实施例一和实施例二对上述技术方案进行描述。
实施例一
一种液晶显示器,液晶显示器包括背光模组、液晶显示面板以及背光控制装置。液晶显示面板的解析度为3840×RGB×2160,背光控制装置的解析度为1920×1080。
背光控制装置包括处理器以及多个背光控制单元。处理器用于接收图像信号,将图像信号分为多个像素单元(j,i),对多个像素单元(j,i)的像素信息进行分析以对应输出多个调光系数,j表示像素单元(j,i)所在行,i表示像素单元(j,i)所在列。每个背光控制单元用于根据一个调光系数调整第一光信号以对应输出一个第二光信号。
处理器包括第一调光系数输出单元,第一调光系数输出单元用于接收图像信号,将图像分为多个像素单元(j,i),计算每个像素单元(j,i)的最大灰阶值Y max以及每个像素单元(j,i)的亮度平均值Ya v,根据如下公式(1)计算出每个像素单元(j,i)对应的第一调光系数L(j,i),
L(j,i)=(1-α)×Y av+αY max    (1),
其中,α为加权系数,Y max的取值小于等于第一阈值时,α等于0,Y max的取值大于等于第二阈值时,α等于1,Y max的取值大于第一阈值且小于第二阈值时,α=kY max,k为大于0的常数。
上述公式(1)的物理含义在于,当每个像素单元(j,i)中有像素的亮度较高时,使得背光(第二光信号)亮度较高,以保证像素单元(j,i)中的最高亮度不损失;当每个像素单元(j,i)中像素的亮度都较低时,背光(第二光信号)亮度较低,保证暗态较暗。
具体地,每个像素的灰阶值的取值范围为0-1023。发明人经过大量的试验得出第一阈值为10,第二阈值为180,k值为1/170。每个像素单元(j,i)包括四个像素。计算四个像素的灰阶值的最大值Y max,并计算四个像素的亮度的平均值Y av,根据加权系数α和四个像素灰阶值的最大值Y max的关系求取加权系数α,并将加权系数α、Y max以及Y av代入公式(1)以求出每个像素单元(j,i)的第一调光系数L(j,i)。
背光控制单元与像素单元一一对应。每个背光控制单元根据一个调光系数调整第一光信号以对应输出一个第二光信号。在本实施例中,第一调光系数L(j,i)为每个像素单元(j,i)对应的调光系数。具体地,像素单元(j,i)对应的第一调光系数L(j,i)为1023时,像素单元(j,i)对应的背光控制单元使第一光信号的光量全部透过该背光控制单元以使该背光控制单元输出第二光信号,即完全透光;像素单元(j,i)对应的第一调光系数L(j,i)为511时,像素单元(j,i)对应的背光控制单元使第一光信号的光量的一半透过该背光控制单元以使该背光控制单元输出第二光信号;像素单元(j,i)对应的第一调光系数L(j,i)为0时,像素单元(j,i)对应的背光控制单元使第一光信号不能透过该背光控制单元,即该背光控制单元完全不透光。可以根据第一调光系数L(j,i)的取值为1023、511以及0时第一光信号和第二光信号之间对应的关系,进行等比例类推以得到第一调光系数L(j,i)的取值介于1023-0之间时第二光信号与第一光信号之间的对应关系。
需要说明的是,背光控制装置可以包括液晶面板,该液晶面板包 括上述多个背光控制单元,液晶面板起到滤光的作用,即对背光模组的发出的第一光信号进行滤光,以输出多个第二光信号。该液晶面板与普通的液晶显示面板的区别在于,该液晶面板没有彩色膜层,只是起到调整背光模组发出的光的透光率的作用。可以理解的是,多个背光控制单元也可以是其他具有滤光作用的结构组成。
液晶显示面板包括多个图像显示像素单元,每个图像显示像素单元包括至少一个图像显示像素,每个图像显示单元与背光控制单元一一对应且接收对应背光控制单元的第二光信号,即图像显示单元与像素单元一一对应,图像显示像素与图像的像素一一对应。
具体地,如图2所示,每个图像显示像素单元31包括四个图像显示像素310,四个图像显示像素310与一个背光控制单元21对应,每个图像显示像素310均包括一个红色图像显示像素R、一个绿色图像显示像素G以及一个蓝色图像显示像素B。液晶显示面板上的每个图像显示像素单元接收对应的背光控制单元输出的第二光信号以显示该图像显示像素单元对应的像素单元的像素信息。
实施例二
本实施例提供一种液晶显示器,本实施例液晶显示器与实施例一的液晶显示器基本相似,不同之处在于,处理器包括第一调光系数输出单元以及空间滤波器,第一调光系数输出单元用于接收图像信号,将图像分为多个像素单元(j,i),计算每个像素单元(j,i)的最大灰阶值Y max以及每个像素单元(j,i)的亮度平均值Y av,根据如下公式(1) 计算出每个所述像素单元(j,i)对应的第一调光系数L(j,i),
L(j,i)=(1-α)×Y av+αY max    (1),
其中,α为加权系数,Y max的取值小于等于第一阈值时,α等于0,Y max的取值大于等于第二阈值时,α等于1,Y max的取值大于第一阈值且小于第二阈值时,α=kY max,k为大于0的常数,
空间滤波器用于对每个像素单元(j,i)对应的第一调光系数L(j,i)进行空间滤波以输出每个像素单元(j,i)对应的第二调光系数L fin(j,i)。
在本实施例中,空间滤波器包括邻域调光系数最大值计算单元、平滑因子计算单元以及第二调光系数输出单元,
邻域调光系数最大值计算单元用于根据如下公式(2)计算像素单元(j,i)邻域调光系数的最大值N max
N max=max(L(j-1,i-1),L(j-1,i),L(j-1,i+1),L(j,i-1),L(j,i+1),L(j+1,i-1),L(j+1,i),L(j+1,i+1))    (2),
其中,L(j-1,i-1)表示像素单元(j-1,i-1)的第一调光系数,L(j-1,i)表示像素单元(j-1,i)的第一调光系数,L(j-1,i+1)表示像素单元(j-1,i+1)的第一调光系数,L(j,i-1)表示像素单元(j,i-1)的第一调光系数,L(j,i+1)表示像素单元(j,i+1)的第一调光系数,L(j+1,i-1)表示像素单元(j+1,i-1)的第一调光系数,L(j+1,i)表示像素单元(j+1,i)的第一调光系数,L(j+1,i+1)表示像素单元(j+1,i+1)的第一调光系数;
平滑因子计算单元用于根据如下公式(3)计算像素单元(j,i)的平 滑因子sf max
sf max=(1-tsf)×N max   (3),
tsf为调控系数,tsf为常数且取值范围为0-1,N max为像素单元(j,i)邻域调光系数的最大值,
第二调光系数输出单元用于根据如下公式(4)计算像素单元(j,i)的第二调光系数L fin(j,i),
L fin(j,i)=max(L(j,i),sf max)   (4),
L(j,i)表示像素单元(j,i)的第一调光系数,sf max表示像素单元(j,i)的平滑因子。
与实施例一的液晶显示器相比,实施例二的液晶显示器通过使多个第一调光系数经过空间滤波得到多个第二调光系数,以改善液晶显示器显示画面时的视角。
实施例三
如图3所示,其为本申请实施例液晶显示器的图像显示方法的流程图,液晶显示器包括背光模组、背光控制装置以及液晶显示面板,背光控制装置位于背光模组和液晶显示面板之间,方法包括如下步骤:
S10:背光模组输出第一光信号;
S11:背光控制装置接收图像信号和第一光信号,将图像分为多个像素单元(j,i),对多个像素单元(j,i)的像素信息进行分析以对应输出多个调光系数,并根据多个调光系数调整第一光信号以输出多个第二光 信号;
S12:液晶显示面板接收多个第二光信号以显示图像信号对应的图像。每个像素单元(j,i)包括至少一个像素,每个像素单元(j,i)对应一个调光系数,j表示像素单元(j,i)所在行,i表示所述像素单元(j,i)所在列。
在本实施例中,背光控制装置包括处理器以及多个背光控制单元,处理器接收图像信号,将图像分为多个像素单元(j,i),对多个像素单元(j,i)的像素信息进行分析以对应输出多个调光系数,每个背光控制单元根据一个调光系数调整第一光信号以对应输出一个第二光信号。
在本实施例中,处理器包括第一调光系数输出单元,所述第一调光系数输出单元接收图像信号,将图像分为多个所述像素单元(j,i),计算每个像素单元(j,i)的最大灰阶值Y max以及每个像素单元(j,i)的亮度平均值Y av,根据如下公式(1)计算出每个像素单元(j,i)对应的第一调光系数L(j,i),
L(j,i)=(1-α)×Y av+αY max    (1),
其中,α为加权系数,Y max的取值小于等于第一阈值时,α等于0,Y max的取值大于等于第二阈值时,α等于1,Y max的取值大于第一阈值且小于第二阈值时,α=kY max,k为大于0的常数,
第一调光系数L(j,i)为每个像素单元(j,i)对应的调光系数。
在其他实施例中,处理器还包括空间滤波器,空间滤波器用于对每个像素单元(j,i)对应的所述第一调光系数L(j,i)进行空间滤波以输出 每个像素单元(j,i)对应的第二调光系数L fin(j,i),第二调光系数L fin(j,i)为每个像素单元(j,i)对应的调光系数。
本申请液晶显示器的图像显示方法通过在背光模组和液晶显示面板之间设置背光控制装置,背光控制装置将图像分为多个像素单元,计算每个像素单元对应的调光系数,并根据多个调光系数调整背光模组输出的第一光信号而输出多个第二光信号,以实现分区调光目的,从而提高液晶显示器显示画面时的对比度。
实施例四
本实施例提供一种背光控制装置,所述背光控制装置用于接收图像信号和第一光信号,将所述图像分为多个像素单元(j,i),对多个所述像素单元(j,i)的像素信息进行分析以对应输出多个调光系数,并根据多个所述调光系数调整所述第一光信号以输出多个第二光信号,其中,每个像素单元(j,i)包括至少一个像素,每个像素单元(j,i)对应一个调光系数,j表示所述像素单元(j,i)所在行,i表示像素单元(j,i)所在列。
本实施例背光控制装置通过将图像分为多个像素单元,计算每个像素单元对应的调光系数,并根据多个调光系数调整输入至背光控制单元的第一光信号而输出多个第二光信号,将该背光控制装置应用于液晶显示器时,以实现分区调光目的,从而提高液晶显示器显示画面时的对比度。
以上实施例的说明只是用于帮助理解本申请的技术方案及其核 心思想;本领域的普通技术人员应当理解:其依然可以对前述各实施例所记载的技术方案进行修改,或者对其中部分技术特征进行等同替换;而这些修改或者替换,并不使相应技术方案的本质脱离本申请各实施例的技术方案的范围。

Claims (16)

  1. 一种液晶显示器,其中,所述液晶显示器包括背光模组、背光控制装置以及液晶显示面板,所述背光控制装置位于所述背光模组和所述液晶显示面板之间,
    所述背光模组用于输出第一光信号;
    所述背光控制装置用于接收图像信号和所述第一光信号,将所述图像分为多个像素单元(j,i),对多个所述像素单元(j,i)的像素信息进行分析以对应输出多个调光系数,并根据多个所述调光系数调整所述第一光信号以输出多个第二光信号;
    所述液晶显示面板用于接收多个所述第二光信号以显示所述图像信号对应的图像;
    其中,每个所述像素单元(j,i)包括至少一个像素,每个所述像素单元(j,i)对应一个所述调光系数,所述j表示所述像素单元(j,i)所在行,所述i表示所述像素单元(j,i)所在列。
  2. 根据权利要求1所述的液晶显示器,其中,所述背光控制装置包括处理器以及多个背光控制单元,所述处理器用于接收所述图像信号,将所述图像分为多个像素单元(j,i),对多个所述像素单元(j,i)的像素信息进行分析以对应输出多个所述调光系数,每个所述背光控制单元用于根据一个所述调光系数调整所述第一光信号以对应输出一个所述第二光信号。
  3. 根据权利要求2所述的液晶显示器,其中,所述处理器包括第一调光系数输出单元,所述第一调光系数输出单元用于接收所述图像信号,将所述图像分为多个所述像素单元(j,i),计算每个所述像素单元(j,i)的最大灰阶值Y max以及每个所述像素单元(j,i)的亮度平均值Y av,根据如下公式(1)计算出每个所述像素单元(j,i)对应的第一调光系数L(j,i),
    L(j,i)=(1-α)×Y av+αY max  (1),
    其中,所述α为加权系数,所述Y max的取值小于等于第一阈值时,所述α等于0,所述Y max的取值大于等于第二阈值时,所述α等于1,所述Y max的取值大于第一阈值且小于第二阈值时,所述α=kY max,所述k为大于0的常数,
    所述第一调光系数L(j,i)为每个所述像素单元(j,i)对应的所述调光系数。
  4. 根据权利要求2所述的液晶显示器,其中,所述处理器包括第一调光系数输出单元和空间滤波器,所述第一调光系数输出单元用于接收所述图像信号,将所述图像分为多个所述像素单元(j,i),计算每个所述像素单元(j,i)的最大灰阶值Y max以及每个所述像素单元(j,i)的亮度平均值Y av,根据如下公式(1)计算出每个所述像素单元(j,i)对应的第一调光系数L(j,i),
    L(j,i)=(1-α)×Y av+αY max  (1),
    其中,所述α为加权系数,所述Y max的取值小于等于第一阈值时,所述α等于0,所述Y max的取值大于等于第二阈值时,所述α等于1, 所述Y max的取值大于第一阈值且小于第二阈值时,所述α=kY max,所述k为大于0的常数,
    所述空间滤波器用于对每个所述像素单元(j,i)对应的所述第一调光系数L(j,i)进行空间滤波以输出每个所述像素单元(j,i)对应的第二调光系数L fin(j,i),所述第二调光系数L fin(j,i)为每个所述像素单元(j,i)对应的所述调光系数。
  5. 根据权利要求4所述的液晶显示器,其中,所述空间滤波器包括邻域调光系数最大值计算单元、平滑因子计算单元以及第二调光系数输出单元,
    所述邻域调光系数最大值计算单元用于根据如下公式(2)计算所述像素单元(j,i)邻域调光系数的最大值N max
    N max=max(L(j-1,i-1),L(j-1,i),L(j-1,i+1),L(j,i-1),L(j,i+1),L(j+1,i-1),L(j+1,i),L(j+1,i+1))  (2),
    其中,所述L(j-1,i-1)表示像素单元(j-1,i-1)的第一调光系数,所述L(j-1,i)表示像素单元(j-1,i)的第一调光系数,所述L(j-1,i+1)表示像素单元(j-1,i+1)的第一调光系数,所述L(j,i-1)表示像素单元(j,i-1)的第一调光系数,所述L(j,i+1)表示像素单元(j,i+1)的第一调光系数,所述L(j+1,i-1)表示像素单元(j+1,i-1)的第一调光系数,所述L(j+1,i)表示像素单元(j+1,i)的第一调光系数,所述L(j+1,i+1)表示像素单元(j+1,i+1)的第一调光系数;
    所述平滑因子计算单元用于根据如下公式(3)计算所述像素单元(j,i)的平滑因子sf max
    sf max=(1-tsf)×N max  (3),
    其中,所述tsf为调控系数,所述tsf为常数且取值范围为0-1,所述N max为所述像素单元(j,i)邻域调光系数的最大值;
    所述第二调光系数输出单元用于根据如下公式(4)计算像素单元(j,i)的所述第二调光系数L fin(j,i),
    L fin(j,i)=max(L(j,i),sf max)  (4),
    所述L(j,i)表示所述像素单元(j,i)的第一调光系数,所述sfmax表示所述像素单元(j,i)的平滑因子。
  6. 根据权利要求3所述的液晶显示器,其中,所述液晶显示面板包括多个图像显示像素单元,每个所述图像显示像素单元包括至少一个图像显示像素,所述图像显示像素单元与所述背光控制单元一一对应且接收对应的所述背光控制单元输出的所述第二光信号,所述图像显示像素与所述图像的像素一一对应。
  7. 根据权利要求6所述的液晶显示器,其中,每个所述图像显示像素单元包括四个所述图像显示像素,每个所述像素单元(j,i)包括四个所述像素。
  8. 根据权利要求2所述的液晶显示器,其中,所述背光控制装置包括液晶面板,所述液晶面板包括多个所述背光控制单元。
  9. 一种液晶显示器的图像显示方法,其中,所述液晶显示器包括背光模组、背光控制装置以及液晶显示面板,所述背光控制装置位于所述背光模组和所述液晶显示面板之间,所述方法包括如下步骤:
    所述背光模组输出第一光信号;
    所述背光控制装置接收图像信号和所述第一光信号,将所述图像分为多个像素单元(j,i),对多个所述像素单元(j,i)的像素信息进行分析以对应输出多个调光系数,并根据多个所述调光系数调整所述第一光信号以输出多个第二光信号;
    所述液晶显示面板接收多个所述第二光信号以显示所述图像信号对应的图像,
    其中,每个所述像素单元(j,i)包括至少一个像素,每个所述像素单元(j,i)对应一个所述调光系数,所述j表示所述像素单元(j,i)所在行,所述i表示所述像素单元(j,i)所在列。
  10. 根据权利要求9所述的图像显示方法,其中,所述背光控制装置包括处理器以及多个背光控制单元,所述处理器接收所述图像信号,将所述图像分为多个像素单元(j,i),对多个所述像素单元(j,i)的像素信息进行分析以对应输出多个所述调光系数,每个所述背光控制单元根据一个所述调光系数调整所述第一光信号以对应输出一个所述第二光信号。
  11. 一种背光控制装置,其中,所述背光控制装置用于接收图像信号和第一光信号,将所述图像分为多个像素单元(j,i),对多个所述像素单元(j,i)的像素信息进行分析以对应输出多个调光系数,并根据多个所述调光系数调整所述第一光信号以输出多个第二光信号,
    其中,每个所述像素单元(j,i)包括至少一个像素,每个所述像素单元(j,i)对应一个所述调光系数,所述j表示所述像素单元(j,i)所在行,所述i表示所述像素单元(j,i)所在列。
  12. 根据权利要求11所述的背光控制装置,其中,所述背光控制装置包括处理器以及多个背光控制单元,所述处理器用于接收所述图像信号,将所述图像分为多个像素单元(j,i),对多个所述像素单元(j,i)的像素信息进行分析以对应输出多个所述调光系数,每个所述背光控制单元用于根据一个所述调光系数调整所述第一光信号以对应输出一个所述第二光信号。
  13. 根据权利要求12所述的背光控制装置,其中,所述处理器包括第一调光系数输出单元,所述第一调光系数输出单元用于接收所述图像信号,将所述图像分为多个所述像素单元(j,i),计算每个所述像素单元(j,i)的最大灰阶值Y max以及每个所述像素单元(j,i)的亮度平均值Y av,根据如下公式(1)计算出每个所述像素单元(j,i)对应的第一调光系数L(j,i),
    L(j,i)=(1-α)×Y av+αY max  (1),
    其中,所述α为加权系数,所述Y max的取值小于等于第一阈值时,所述α等于0,所述Y max的取值大于等于第二阈值时,所述α等于1,所述Y max的取值大于第一阈值且小于第二阈值时,所述α=kY max,所述k为大于0的常数,
    所述第一调光系数L(j,i)为每个所述像素单元(j,i)对应的所述调光系数。
  14. 根据权利要求12所述的背光控制装置,其中,所述处理器包括第一调光系数输出单元和空间滤波器,所述第一调光系数输出单元用于接收所述图像信号,将所述图像分为多个所述像素单元(j,i),计算 每个所述像素单元(j,i)的最大灰阶值Y max以及每个所述像素单元(j,i)的亮度平均值Y av,根据如下公式(1)计算出每个所述像素单元(j,i)对应的第一调光系数L(j,i),
    L(j,i)=(1-α)×Y av+αY max  (1),
    其中,所述α为加权系数,所述Y max的取值小于等于第一阈值时,所述α等于0,所述Y max的取值大于等于第二阈值时,所述α等于1,所述Y max的取值大于第一阈值且小于第二阈值时,所述α=kY max,所述k为大于0的常数,
    所述空间滤波器用于对每个所述像素单元(j,i)对应的所述第一调光系数L(j,i)进行空间滤波以输出每个所述像素单元(j,i)对应的第二调光系数L fin(j,i),所述第二调光系数L fin(j,i)为每个所述像素单元(j,i)对应的所述调光系数。
  15. 根据权利要求14所述的背光控制装置,其中,所述空间滤波器包括邻域调光系数最大值计算单元、平滑因子计算单元以及第二调光系数输出单元,
    所述邻域调光系数最大值计算单元用于根据如下公式(2)计算所述像素单元(j,i)邻域调光系数的最大值N max
    N max=max(L(j-1,i-1),L(j-1,i),L(j-1,i+1),L(j,i-1),L(j,i+1),L(j+1,i-1),L(j+1,i),L(j+1,i+1))  (2),
    其中,所述L(j-1,i-1)表示像素单元(j-1,i-1)的第一调光系数,所述L(j-1,i)表示像素单元(j-1,i)的第一调光系数,所述L(j-1,i+1)表示像素单元(j-1,i+1)的第一调光系数,所述L(j,i-1)表示像素 单元(j,i-1)的第一调光系数,所述L(j,i+1)表示像素单元(j,i+1)的第一调光系数,所述L(j+1,i-1)表示像素单元(j+1,i-1)的第一调光系数,所述L(j+1,i)表示像素单元(j+1,i)的第一调光系数,所述L(j+1,i+1)表示像素单元(j+1,i+1)的第一调光系数;
    所述平滑因子计算单元用于根据如下公式(3)计算所述像素单元(j,i)的平滑因子sf max
    sf max=(1-tsf)×N max  (3),
    其中,所述tsf为调控系数,所述tsf为常数且取值范围为0-1,所述N max为所述像素单元(j,i)邻域调光系数的最大值;
    所述第二调光系数输出单元用于根据如下公式(4)计算像素单元(j,i)的所述第二调光系数L fin(j,i),
    L fin(j,i)=max(L(j,i),sf max)  (4),
    所述L(j,i)表示所述像素单元(j,i)的第一调光系数,所述sfmax表示所述像素单元(j,i)的平滑因子。
  16. 根据权利要求11所述的背光控制装置,其中,所述背光控制装置包括液晶面板,所述液晶面板包括多个所述背光控制单元。
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