WO2018120609A1 - 液晶显示装置及其驱动方法 - Google Patents

液晶显示装置及其驱动方法 Download PDF

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Publication number
WO2018120609A1
WO2018120609A1 PCT/CN2017/085349 CN2017085349W WO2018120609A1 WO 2018120609 A1 WO2018120609 A1 WO 2018120609A1 CN 2017085349 W CN2017085349 W CN 2017085349W WO 2018120609 A1 WO2018120609 A1 WO 2018120609A1
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Prior art keywords
backlight
sub
pixel
partition
frame image
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PCT/CN2017/085349
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English (en)
French (fr)
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陈猷仁
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惠科股份有限公司
重庆惠科金渝光电科技有限公司
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Priority to US15/743,954 priority Critical patent/US10546543B2/en
Publication of WO2018120609A1 publication Critical patent/WO2018120609A1/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
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3614—Control of polarity reversal in general
    • 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
    • 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
    • G09G3/3413—Details of control of colour illumination sources
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
    • G09G3/3426—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines the different display panel areas being distributed in two dimensions, e.g. matrix
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3607—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 for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
    • 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
    • G09G2320/0242—Compensation of deficiencies in the appearance of colours
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0285—Improving the quality of display appearance using tables for spatial correction of display data
    • 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
    • G09G2320/029—Improving the quality of display appearance by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference pixel
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/16—Calculation or use of calculated indices related to luminance levels in display data

Definitions

  • the present application relates to the field of liquid crystal display technology, and in particular, to a liquid crystal display device and a driving method thereof.
  • VA liquid crystal or IPS liquid crystal technology Conventional large-size liquid crystal display devices mostly use negative VA liquid crystal or IPS liquid crystal technology.
  • the VA type liquid crystal drive rapidly saturates the driving voltage with a large viewing angle, which leads to a serious visual role, which in turn affects the image quality.
  • a liquid crystal display device and a driving method thereof which are capable of improving the disadvantage of a visual character bias.
  • a driving method of a liquid crystal display device comprising:
  • Each frame is sequentially displayed using two frames of images;
  • the two frames of images include a first frame image and a second frame image; and driving voltages of two adjacent sub-pixels on each frame image are one high and one low, and The driving voltage of each sub-pixel in the image of the first frame and the driving voltage in the image of the second frame are one high and one low;
  • the backlight brightness adjustment signal is a group signal and the number of groups and color sub-pixels The same number of species
  • the backlight in the backlight partition in each frame image of the next frame is brightness-adjusted according to the backlight brightness adjustment signal of the backlight partition.
  • the driving voltage of each of the first frame image and the second frame image is searched and acquired using a lookup table according to an input signal of each picture.
  • the step of pre-storing the lookup table is also included.
  • the step of determining a backlight brightness adjustment signal of each backlight partition according to a driving voltage of the first frame image area and the second frame image area corresponding to each backlight partition comprises:
  • a backlight brightness adjustment signal is obtained according to an average driving voltage of each backlight partition, a reference backlight luminance signal, and a reference driving voltage.
  • the step of determining a backlight brightness adjustment signal according to the average driving voltage of each backlight partition, the reference backlight brightness signal, and the reference driving voltage, the backlight of each color sub-pixel in each backlight partition The calculation formula of the brightness adjustment signal is as follows:
  • a M_P1 *P M_ave1 A M_P2 *P M_ave2 ;
  • P denotes a target color sub-pixel
  • M denotes a sequence number of the backlight partition
  • a M_P1 denotes a backlight brightness adjustment for a backlight of a P sub-pixel in the backlight partition M corresponding to the first frame image of the next picture a backlight brightness adjustment signal
  • a M_P2 represents a backlight brightness adjustment signal for backlight brightness adjustment of the backlight of the P sub-pixel in the backlight partition M corresponding to the second frame image of the next picture
  • P M_ave1 An average value of driving voltages of the P sub-pixels in the backlight partition M corresponding to a first frame image of a current picture
  • P M_ave2 indicating the backlight partition M corresponding to a second frame image of a current picture An average value of the driving voltages of the P sub-pixels
  • a M_P represents a reference backlight luminance signal of the P sub-pixels in the backlight partition M corresponding to an image of a current picture
  • P M_ave
  • the backlight of the backlight partition is not performed. Dimming.
  • the step of brightness adjusting the backlight in the backlight partition in each frame image of the next frame according to the backlight brightness adjustment signal of the backlight partition includes:
  • the backlight adjustment object includes a backlight of at least one of a red sub-pixel, a green sub-pixel, and a blue sub-pixel;
  • the step of determining a backlight adjustment object according to the hue range of the average display hue is a step of determining a backlight adjustment object according to the hue range of the average display hue
  • the backlight adjustment object is a backlight corresponding to a red sub-pixel
  • the backlight adjustment object is a backlight corresponding to each of the red sub-pixel and the green sub-pixel;
  • the backlight adjustment object is a backlight corresponding to the green sub-pixel
  • the backlight adjustment object is a backlight corresponding to each of the green sub-pixel and the blue sub-pixel;
  • the backlight adjustment object is a backlight corresponding to the blue sub-pixel
  • the backlight adjustment object is a backlight corresponding to the blue sub-pixel and the red sub-pixel; H represents an average display hue.
  • a liquid crystal display device comprising:
  • a backlight module is disposed to provide backlight to the display panel; the backlight module is divided into a plurality of backlight partitions;
  • a driving component connected to the display panel, configured to sequentially display each frame using two frames of images; the two frames of images include a first frame image and a second frame image; adjacent two images on each frame image
  • the driving voltage of the sub-pixels is one high and one low, and the driving voltage of each sub-pixel in the image of the first frame and the driving voltage in the image of the second frame are one high and one low;
  • a backlight control component coupled to the drive component;
  • the backlight control component comprising a memory and at least one processor;
  • the memory storing computer executable instructions executable by the at least one processor, the computer executable The instructions are executed by the at least one processor such that the at least one processor performs the following steps:
  • the backlight brightness adjustment signal is a group signal and the number of groups and color sub-pixels The same number of categories;
  • the backlight adjusting component is configured to, when the backlight control component determines that an average color purity of the backlight partition is within a preset range, according to the The backlight brightness adjustment signal of the backlight partition adjusts the brightness of the backlight in the backlight partition in each frame image of the next picture.
  • a storage component is further included; the storage component is configured to store a lookup table; the lookup table is each of a first frame image and a second frame image corresponding to the input signal of the input signal a correspondence table of driving voltages of pixels; the driving unit acquires driving voltages of each of the sub-pixels on the first frame image and the second frame image through a lookup table.
  • the at least one processor when the computer executable instructions are executed by the at least one processor, the at least one processor is further caused to perform the steps of:
  • a statistical unit configured to count a first frame image area corresponding to each of the backlight partitions and a second The average driving voltage of the various color sub-pixels in the frame image area;
  • the calculating unit is configured to obtain a backlight brightness adjustment signal according to the average driving voltage, the reference backlight brightness signal, and the reference driving voltage of each backlight partition.
  • the formula for calculating the backlight brightness adjustment signal for each color sub-pixel in each backlight partition is as follows:
  • a M_P1 *P M_ave1 A M_P2 *P M_ave2 ;
  • P represents a target color sub-pixel
  • M represents a sequence number of the backlight partition
  • a M_P1 represents a backlight brightness adjustment of a backlight of a P sub-pixel in the backlight partition M corresponding to the first frame image of the next frame.
  • a M_P2 represents a backlight brightness adjustment signal set to backlight brightness adjustment of the backlight of the P sub-pixel in the backlight partition M corresponding to the second frame image of the next picture
  • P M_ave1 An average value of driving voltages of the P sub-pixels in the backlight partition M corresponding to a first frame image of a current picture
  • P M_ave2 corresponding to a second frame image of a current picture
  • a M_P represents the reference backlight luminance signal of the P sub-pixels in the backlight partition M corresponding to the image of the current picture
  • P M_ave represents the current picture An average value of the reference driving voltages of the P sub-pixels in the frame pattern region corresponding to the backlight partition M on the image.
  • the computer executable instructions when executed by the at least one processor, further causing the at least one processor to perform when determining that an average color purity of the backlight partition is not within a preset range The step of controlling the backlight adjustment component to not perform brightness adjustment on a backlight within the backlight partition.
  • the at least one processor when executed by the at least one processor, further causing the at least one processor to perform the calculating when determining that the average color purity is within a preset range a step of determining a hue adjustment object according to an average display hue of a current picture region corresponding to the backlight partition, and determining a backlight adjustment object according to the range of the average display hue;
  • the backlight adjustment object includes a red sub-pixel, a green sub-pixel, and a blue sub-pixel a backlight of at least one sub-pixel;
  • the backlight adjustment component is further configured to adjust a backlight adjustment signal according to the backlight adjustment object No independent brightness adjustment is performed on the backlight adjustment object.
  • the at least one processor when the computer executable instructions are executed by the at least one processor, the at least one processor is further caused to:
  • the backlight adjustment object is a backlight corresponding to the blue sub-pixel and the red sub-pixel; H represents an average display hue.
  • the backlight is a white backlight, an RGB backlight, an RGBW backlight, or an RGBY backlight.
  • a liquid crystal display device comprising:
  • a backlight module is disposed to provide backlight to the display panel; the backlight module is divided into a plurality of backlight partitions;
  • a driving component connected to the display panel, configured to sequentially display each frame using two frames of images; the two frames of images include a first frame image and a second frame image; adjacent two images on each frame image
  • the driving voltage of the sub-pixels is one high and one low, and the driving voltage of each sub-pixel in the image of the first frame and the driving voltage in the image of the second frame are one high and one low;
  • a backlight control component coupled to the drive component;
  • the backlight control component including a memory and at least one processor;
  • the memory storing a calculation executable by the at least one processor
  • the machine executable instructions when the computer executable instructions are executed by the at least one processor, cause the at least one processor to perform the following steps:
  • the backlight brightness adjustment signal is a group signal and the number of groups and color sub-pixels The same number of categories;
  • the backlight adjusting component is configured to, when the backlight control component determines that an average color purity of the backlight partition is within a preset range, according to the The backlight brightness adjustment signal of the backlight partition performs brightness adjustment on the backlight in the backlight partition in each frame image of the next picture;
  • the at least one processor when executed by the at least one processor, the at least one processor is further caused to perform the steps of:
  • a statistical unit configured to count an average driving voltage of each color sub-pixel in the image area of the first frame and the image area of the second frame corresponding to each backlight partition;
  • the calculating unit is configured to obtain a backlight brightness adjustment signal according to an average driving voltage of each backlight partition, a reference backlight brightness signal, and a reference driving voltage, and the calculation formula is as follows
  • a M_P1 *P M_ave1 A M_P2 *P M_ave2 ;
  • P denotes a target color sub-pixel
  • M denotes a sequence number of the backlight partition
  • a M_P1 denotes a backlight set to backlight brightness adjustment of a backlight of a P sub-pixel in the backlight partition M corresponding to the first frame image of the next picture
  • a M_P2 represents a backlight brightness adjustment signal set to backlight brightness adjustment of the backlight of the P sub-pixel in the backlight partition M corresponding to the second frame image of the next picture;
  • P M_ave1 indicates current The average value of the driving voltages of the P sub-pixels in the backlight partition M corresponding to the first frame image of one picture;
  • a M_P represents the reference backlight luminance signal of the P sub-pixels in the backlight partition M corresponding to the image of the current picture;
  • the at least one processor when executed by the at least one processor, further causing the at least one processor to perform the calculating when determining that the average color purity is within a preset range a step of determining a hue adjustment object according to an average display hue of a current picture region corresponding to the backlight partition, and determining a backlight adjustment object according to the range of the average display hue;
  • the backlight adjustment object includes a red sub-pixel, a green sub-pixel, and a blue sub-pixel a backlight of at least one sub-pixel;
  • the backlight adjustment component is further configured to perform independent brightness adjustment on the backlight adjustment object according to a backlight adjustment signal corresponding to the backlight adjustment object.
  • the liquid crystal display device and the driving method thereof wherein each frame is sequentially displayed using two frames of images, each frame image is driven by a high and low phase voltage signal, and the high and low driving voltages of the first frame image and the second frame image are used. Reverses and generates a backlight brightness adjustment signal for the next picture based on each drive voltage.
  • the average color purity of the current picture area corresponding to each backlight partition is calculated, and only when the average color purity is determined to be within the preset range, the corresponding image in each frame image of the next picture is
  • the backlight in the backlight partition is adjusted by backlight, so that the flicker discomfort caused by the difference of high and low voltage switching during driving can be reduced, and the problem of visible flicker which may be caused by frequent backlight adjustment can be avoided, and the liquid crystal display device can be effectively improved.
  • FIG. 1 is a flow chart showing a driving method of a liquid crystal display device in an embodiment
  • FIG. 2 is a schematic diagram of partitioning a backlight area of a liquid crystal display device in FIG. 1;
  • FIG. 3 is a schematic view of the display area of the liquid crystal display device of FIG. 1;
  • FIG. 4 and FIG. 5 are partial enlarged views of FIG. 3;
  • FIG. 6 is a specific flowchart of step S120 in FIG. 1;
  • FIG. 7 is a schematic diagram of a CIE LCH color space system employed in step S150 of FIG. 1;
  • FIG. 8 is a specific flowchart of step S150 in FIG. 1;
  • FIG. 9 is a block diagram showing the structure of a liquid crystal display device in an embodiment
  • Figure 10 is a block diagram showing the structure of a backlight control unit in an embodiment.
  • the liquid crystal display device may be a TN, OCB, VA type or curved liquid crystal display device, but is not limited thereto.
  • the liquid crystal display device can use a direct backlight, and the backlight can be white light, RGB three-color light source, RGBW four-color light source or RGBY four-color light source, but is not limited thereto.
  • the backlight area of the liquid crystal display device is divided into a plurality of backlight partitions, as shown in FIG. 2 .
  • 90 denotes a backlight module (or a backlight module).
  • the method includes the following steps:
  • step S110 each frame is sequentially displayed using two frames of images.
  • Each frame frame_N (that is, a conventional one frame) is sequentially displayed using two frames of images, that is, one frame is divided into two frames in time series. By dividing the picture in time series, the frame frequency multiplication can be realized, that is, the original 60Hz is multiplied to 120Hz.
  • the two frame images are a first frame image (frame_N-1) and a second frame image (frame_N-2), respectively.
  • the screen corresponding to the input signal is displayed to the user by mutually compensating the first frame image and the second frame image.
  • the driving voltages of two adjacent sub-pixels on each frame image are one high and one low
  • the driving voltage of each sub-pixel in the first frame image and the driving in the second frame image are One high and one low.
  • the driving voltage of each sub-pixel of the first frame image is inverted to form the driving voltage of each sub-pixel of the second frame image.
  • the driving voltage of each sub-pixel in the first frame image and the second frame image can be acquired by using a lookup table (LUT, Look UP Table).
  • the lookup table is stored in the hardware frame buffer in advance in the liquid crystal display device.
  • the lookup table is a correspondence table of the screen input signal and the driving voltage of each sub-pixel of the first frame image and the second frame image corresponding to the input signal.
  • each R/G/B input signal input color gray value 0 ⁇ 255 corresponds to 256 pairs of high and low voltage signals, and there are 3*256 pairs of high voltage signals R TH /G TH /B TH and low.
  • Voltage signal R TL /G TL /B TL corresponds to 256 pairs of high and low voltage signals, and there are 3*256 pairs of high voltage signals R TH /G TH /B TH and low.
  • the corresponding high driving voltage and the corresponding low driving voltage can be searched according to the color gray value of each sub-pixel in the input signal, thereby driving the high driving voltage to drive the corresponding sub-pixel in the first frame image and the low driving Driving a corresponding sub-pixel in the second frame image, or driving the low driving voltage to drive a corresponding sub-pixel in the first frame image and driving the high driving voltage to a corresponding sub-pixel in the second frame image, and simultaneously adjacent two sub-pixels
  • the pixel is driven by a high-low drive voltage phase-to-phase drive, as shown in Figure 3.
  • 4 is a partial enlarged view of the first frame in FIG. 3
  • FIG. 5 is a partial enlarged view of the second frame in FIG.
  • Step S120 determining a backlight brightness adjustment signal of each backlight partition according to driving voltages of the first frame image area and the second frame image area corresponding to each backlight partition.
  • the backlight brightness adjustment signal is used to adjust the brightness of the backlight of the two frames in the next picture to reduce the apparent role of the picture.
  • the backlight brightness adjustment signal is a group signal (A M_P1 and A M_P2 , P represents a target color sub-pixel) to adjust the backlight brightness of the backlight partition corresponding to the first frame image and the second frame image, respectively.
  • the number of sets of backlight brightness adjustment signals is the same as the type of color sub-pixels, so that independent backlight brightness control is performed for each color sub-pixel.
  • the color sub-pixels include a red sub-pixel (R sub-pixel), a green sub-pixel (G sub-pixel), and a blue sub-pixel (B sub-pixel), so each set of backlight brightness adjustment signals includes
  • R sub-pixel backlight brightness adjustment signal group, the G sub-pixel backlight brightness adjustment signal group, and the B sub-pixel backlight brightness adjustment signal are used to perform independent backlight brightness adjustment control on various color sub-pixels in each backlight partition.
  • the process of determining the backlight brightness adjustment signal is as shown in FIG. 6, and includes steps S210 and S220.
  • Step S210 counting the first frame image area and the second frame image area corresponding to each backlight partition The average driving voltage of the various color sub-pixels.
  • P represents a target color sub-pixel
  • M represents a sequence number of the backlight partition
  • ave1 represents an average driving voltage value of the first frame image
  • n represents a sequential number of the P sub-pixels in the backlight partition M.
  • the average driving voltage of each color sub-pixel is calculated as follows:
  • Step S220 determining a backlight brightness adjustment signal according to an average driving voltage of each backlight partition, a reference backlight luminance signal, and a reference driving voltage.
  • the reference backlight luminance signal refers to the backlight luminance signal required when high and low voltage compensation (that is, the conventional driving method) is not performed.
  • the reference driving voltage refers to the driving voltage of various sub-pixels when high and low voltage compensation are not performed. Since the corresponding backlights of the various color sub-pixels in each partition are independently controlled, it is required to take the backlight brightness adjustment signal of the backlight corresponding to the various color sub-pixels in each partition.
  • the calculation formula of the backlight brightness adjustment signal of each color sub-pixel in each backlight partition M is as follows:
  • a M_P1 *P M_ave1 A M_P2 *P M_ave2 ;
  • P represents the target color sub-pixel
  • M represents the serial number of the backlight partition.
  • a M_P1 represents a backlight brightness adjustment signal for backlight brightness adjustment of the backlight of the P sub-pixel in the backlight partition M corresponding to the first frame image of the next picture.
  • a M_P2 denotes a backlight brightness adjustment signal for performing backlight brightness adjustment on the backlight of the P sub-pixel in the backlight partition M corresponding to the second frame image of the next picture.
  • P M_ave1 represents the average value of the driving voltages of the P sub-pixels in the backlight partition M corresponding to the first frame image of the current picture.
  • the average value of the driving voltage can be used as an evaluation parameter of the viewing angle luminance of the color sub-pixel.
  • P M_ave2 represents the average value of the driving voltages of the P sub-pixels in the backlight partition M corresponding to the second frame image of the current picture.
  • AM_P represents the reference backlight luminance signal of the P sub-pixels in the backlight partition M corresponding to the image of the current picture.
  • P M_ave represents the average value of the reference driving voltages of the P sub-pixels in the frame pattern region corresponding to the backlight partition M on the image of the current picture.
  • one pixel of each frame image includes an R sub-pixel, a G sub-pixel, and a B sub-pixel. Therefore, the corresponding backlight brightness adjustment signal of the backlight of each color sub-pixel in each backlight partition is required, as follows:
  • the backlight brightness adjustment signals A M_R1 and A M_R2 of the R sub-pixels in the backlight partition M are calculated as
  • a M_R1 *R M_ave1 A M_R2 *R M_ave2 ;
  • the backlight brightness adjustment signals A M_G1 and A M_G2 of the G sub-pixels in the backlight partition M are calculated as
  • a M_G1 *G M_ave1 A M_G2 *G M_ave2 ;
  • the backlight brightness adjustment signals A M_B1 and A M_B2 of the B sub-pixels in the backlight partition M are calculated as
  • a M_B1 *B M_ave1 A M_B2 *B M_ave2 ;
  • Step S130 calculating an average color purity of a current picture area corresponding to each backlight partition.
  • L represents brightness
  • C represents color purity, which represents the degree of vividness of the color.
  • the range of C is represented by 0 to 100, and 100 represents the most vivid color.
  • the value of C exhibits a voltage signal at the time of display driving of the liquid crystal display device to a certain extent. Therefore, when the average color purity of each picture is obtained, it can be calculated by obtaining an average driving voltage.
  • the average color purity is obtained by first obtaining an average driving voltage of each color sub-pixel of the current one screen region corresponding to each backlight partition. That is, the driving voltages of the first and second color image sub-pixels corresponding to each of the backlight regions are summed and averaged.
  • the driving voltage of the second frame image is the inversion of the driving voltage of the first frame image, that is, the average driving voltage of the two frames of images is the same. Therefore, the average driving voltage of the color sub-pixel corresponding to the current picture region in the backlight partition can be obtained by simply obtaining the average driving voltage in one frame of the image.
  • the specific calculation formula is as follows:
  • R_ave Ave(R M_1 +RM_2+...+R M_n );
  • G_ave Ave(G M_1 +GM_2+...+G M_n );
  • B_ave Ave(B M_1 +BM_2+...+B M_n ).
  • step S140 it is determined whether the average color purity of each backlight partition is within a preset range.
  • the preset range that is, C TL and C TH can be set as needed. Determine whether the average color purity C is satisfied:
  • step S150 is performed on the backlight partition, otherwise step S160 is performed on the backlight partition.
  • Step S150 according to the backlight brightness adjustment signal of the backlight partition, each frame of the next picture The backlight in the backlight partition in the image is brightness adjusted.
  • independent backlight adjustments can be made to the backlights of the various color sub-pixels according to the generated multiple sets of backlight brightness adjustment signals.
  • the backlights of the R sub-pixel, the G sub-pixel and the B sub-pixel in the corresponding backlight partition M of the first frame image in the next picture are independently adjusted according to A M_R1 , A M_G1 and A M_B1 , and Independently adjusting the backlights of the R sub-pixel, the G sub-pixel, and the B sub-pixel in the corresponding backlight partition M of the second frame image in the next picture according to A M_R2 , A M_G2 , and A M_B2 to make the compensated
  • the picture brightness is the same as the picture brightness when no high and low voltage compensation (ie, conventional driving) is performed.
  • independent backlight control it is possible to reduce the flicker discomfort caused by the difference in high and low voltage switching during driving, and effectively improve the color shift defect caused by the refractive index mismatch of the large viewing angle
  • step S150 includes the following sub-steps, as shown in FIG.
  • Step S310 calculating an average display hue of the current picture area corresponding to the backlight partition.
  • H represents the display hue, that is, the color representation.
  • 0 to 360° represents different hue color representations, where 0° is defined as red, 90° is yellow, 180° is green, and 270° is blue.
  • Step S320 determining a backlight adjustment object according to the hue range of the average display hue.
  • the hue value is divided into a plurality of range regions in advance.
  • the division method can be set as needed.
  • the hue value is divided into six regions, each of which corresponds to a respective backlight adjustment object.
  • the backlight adjustment object is a backlight corresponding to the red sub-pixel; when 45° ⁇ H ⁇ 135°, the backlight adjustment object is a red sub-pixel a backlight corresponding to each of the green sub-pixels; when 135° ⁇ H ⁇ 205°, the backlight adjustment object is a backlight corresponding to the green sub-pixel; when 205° ⁇ H ⁇ 245°, the backlight adjustment object is a green sub-pixel and
  • Each of the blue sub-pixels corresponds to a backlight; when 245° ⁇ H ⁇ 295°, the backlight adjustment object is The backlight corresponding to the blue sub-pixel; when 295° ⁇ H ⁇ 315°, the backlight adjustment object is
  • Step S330 performing independent brightness adjustment on the backlight brightness adjustment target according to the backlight brightness adjustment signal corresponding to the backlight adjustment object.
  • the backlight adjustment object when 0° ⁇ H ⁇ 45° or 315° ⁇ H ⁇ 360°, the backlight adjustment object is a backlight corresponding to the red sub-pixel, that is, the backlight of the red sub-pixel in the backlight partition according to AM_R1 and AM_R2.
  • the source performs backlight adjustment without adjusting the backlight brightness of other color sub-pixels.
  • the backlight adjustment object is a backlight corresponding to each of the red sub-pixel and the green sub-pixel, that is, according to A M_R1 and A M_R2 , A M_G1 and A M_G2 respectively to the red sub-pixel and the blue sub-
  • the backlight of the pixel is independently backlighted. Other situations are similar to the processing of the above situation, and the description will not be repeated here.
  • step S160 the backlight brightness adjustment is not performed on the backlight partition.
  • each frame is sequentially displayed using two frames of images, each frame image is driven by a high and low phase voltage signal, and the high and low driving voltages of the first frame image and the second frame image are reversed. Turn, and generate the backlight brightness adjustment signal of the next picture according to each driving voltage.
  • the average color purity of the current picture area corresponding to each backlight partition is calculated, and only when the average color purity is determined to be within the preset range, the corresponding image in each frame image of the next picture is
  • the backlight in the backlight partition is adjusted by backlight, so that the flicker discomfort caused by the difference of high and low voltage switching during driving can be reduced, and the problem of visible flicker which may be caused by frequent backlight adjustment can be avoided, and the liquid crystal display device can be effectively improved.
  • the above driving method not only maintains the overall panel brightness and the uncompensated conventional driving brightness, but also realizes the Low color shift viewing angle compensation effect, and can avoid the difference between the high and low voltage switching when the original driving is performed.
  • the visible flicker discomfort of the naked eye effectively improves the color shift defect caused by the mismatch of the refractive index of the liquid crystal display device at a large viewing angle.
  • the above driving method can implement the cooperative driving on the time domain and the spatial domain.
  • the pixels of the liquid crystal display device do not need to be further divided into primary and secondary sub-pixels, thereby greatly reducing the display.
  • the process complexity of the panel greatly improves the transmittance and resolution of the liquid crystal display panel, and reduces the design of the backlight cost.
  • the present application also provides a liquid crystal display device as shown in FIG.
  • the liquid crystal display device can perform the above driving method.
  • the liquid crystal display device includes a display panel 810, a backlight module 820, and further includes a driving part 830, a backlight control part 840, and a backlight adjusting part 850.
  • the display panel 810 and the driving component 830 can be integrated on the display panel, and the backlight module 820, the backlight control component 840, and the backlight adjustment component 850 can be integrated on the backlight module. It will be understood that the manner in which the components are integrated is not limited thereto.
  • the display panel 810 can employ a TN, OCB, or VA type TFT display panel, but is not limited thereto.
  • the display panel 810 may be a display panel having a curved panel.
  • the backlight module 820 is configured to provide backlighting.
  • the backlight module 820 can use a direct backlight.
  • the backlight can be a white light, an RGB three-color light source, an RGBW four-color light source, or an RGBY four-color light source, but is not limited thereto.
  • the backlight area of the backlight module 820 is divided into a plurality of backlight partitions, as shown in FIG. 2 .
  • the drive unit 830 is connected to the display panel 810.
  • the drive unit 830 is arranged to display each frame using two frames of images.
  • the two frame images are the first frame image and the second frame image, respectively.
  • the screen corresponding to the input signal is displayed to the user by mutually compensating the first frame image and the second frame image.
  • the driving voltages of two adjacent sub-pixels on each frame image are one high and one low
  • the driving voltage of each sub-pixel in the first frame image and the driving in the second frame image are One high and one low. That is, the driving voltage of each sub-pixel of the first frame image is inverted to form the driving voltage of each sub-pixel of the second frame image.
  • the driving voltage that the driving part 730 drives each sub-pixel can be acquired by using a lookup table search.
  • the lookup table is stored in the hardware frame buffer in advance in the liquid crystal display device.
  • the lookup table is a correspondence table of an input signal and a driving voltage of each of the first frame image and the second frame image corresponding to the input signal.
  • the drive unit 730 includes a timing control circuit (TCON, an abbreviation for timing controller).
  • the liquid crystal display device further includes a storage device 860 configured to store the lookup table.
  • the backlight control unit 840 is connected to the driving unit 830.
  • the backlight control section 840 is arranged to determine a backlight brightness adjustment signal for each of the backlight sections in accordance with a driving voltage of the first frame image area and the second frame image area corresponding to each of the backlight sections.
  • backlight control component 840 includes a memory and at least one processor. Computer executable instructions executable by at least one processor are stored in the memory. The computer executable instructions are executed by the at least one processor such that the at least one processor performs backlight brightness adjustment for each backlight partition based on driving voltages of the first frame image region and the second frame image region corresponding to each backlight partition The steps of the signal.
  • the backlight brightness adjustment signal is a group signal (A M_P1 and A M_P2 , P represents a target color sub-pixel) to adjust the backlight brightness of the corresponding backlight partition of the first frame image and the second frame image, respectively.
  • the number of sets of backlight brightness adjustment signals is the same as the type of color sub-pixels, so that independent backlight brightness control is performed for each color sub-pixel.
  • the color sub-pixels include a red sub-pixel (R sub-pixel), a green sub-pixel (G sub-pixel), and a blue sub-pixel (B sub-pixel), so each set of backlight brightness adjustment signals includes
  • R sub-pixel backlight brightness adjustment signal group, the G sub-pixel backlight brightness adjustment signal group, and the B sub-pixel backlight brightness adjustment signal are used to perform independent backlight brightness adjustment control on various color sub-pixels in each backlight partition.
  • the at least one processor is further caused to perform the steps in the following units, as shown in FIG.
  • the statistical unit 842 is configured to calculate an average driving voltage of each color sub-pixel in the corresponding first frame image region in each backlight partition as follows:
  • P represents a target color sub-pixel
  • M represents a sequence number of the backlight partition
  • ave1 represents an average driving voltage value of the first frame image
  • n represents a sequential number of the P sub-pixels in the backlight partition M.
  • the average driving voltage of each color sub-pixel is calculated as follows:
  • the calculating unit 844 is configured to obtain a backlight brightness adjustment signal according to an average driving voltage of each backlight partition, a reference backlight luminance signal, and a reference driving voltage.
  • the reference backlight luminance signal refers to the backlight luminance signal required when high and low voltage compensation (that is, the conventional driving method) is not performed.
  • the reference drive voltage is Refers to the driving voltage of various sub-pixels when high and low voltage compensation is not performed. Since the corresponding backlights of the various color sub-pixels in each partition are independently controlled, it is required to take the backlight brightness adjustment signal of the backlight corresponding to the various color sub-pixels in each partition.
  • the calculation formula of the backlight brightness adjustment signal of each color sub-pixel in each backlight partition M is as follows:
  • a M_P1 *P M_ave1 A M_P2 *P M_ave2 ;
  • P represents the target color sub-pixel
  • M represents the serial number of the backlight partition.
  • a M_P1 represents a backlight brightness adjustment signal for backlight brightness adjustment of the backlight of the P sub-pixel in the backlight partition M corresponding to the first frame image of the next picture.
  • a M_P2 denotes a backlight brightness adjustment signal for performing backlight brightness adjustment on the backlight of the P sub-pixel in the backlight partition M corresponding to the second frame image of the next picture.
  • P M_ave1 represents the average value of the driving voltages of the P sub-pixels in the backlight partition M corresponding to the first frame image of the current picture.
  • the average value of the driving voltage can be used as an evaluation parameter of the viewing angle luminance of the color sub-pixel.
  • P M_ave2 represents the average value of the driving voltages of the P sub-pixels in the backlight partition M corresponding to the second frame image of the current picture.
  • a M_P represents the reference backlight luminance signal of the P sub-pixel in the backlight partition M corresponding to the image of the current picture.
  • P M_ave represents the average value of the reference driving voltages of the P sub-pixels in the frame pattern region corresponding to the backlight partition M on the image of the current picture.
  • the at least one processor is further caused to perform the steps in the determining unit 846.
  • the calculation unit 844 is further configured to calculate an average color purity of a current picture region corresponding to each backlight partition.
  • the determining unit 846 is configured to determine whether the average color purity of each backlight partition is within a preset range, and only control the backlight adjusting component 850 according to the backlight when it is determined that the average color purity of the backlight partition is within a preset range.
  • the partitioned backlight brightness adjustment signal adjusts the brightness of the backlight in the backlight partition in each frame image of the next picture, so that the compensated picture brightness is the same as the picture brightness when the high and low voltage compensation is not performed. Otherwise, the backlight adjustment section 850 is not controlled to perform backlight brightness adjustment on the backlight partition.
  • the backlight adjustment component 850 is based on The backlight brightness adjustment signal of each backlight partition performs independent brightness adjustment on the backlights of the respective color sub-pixels in the corresponding backlight partitions in each frame image of the next picture, so that the compensated picture brightness is not high or low.
  • the picture brightness at the time of voltage compensation is the same.
  • the backlight control component 840 is further configured to: when determining that the backlight partition needs to perform backlight brightness compensation, calculate, by the calculating unit 844, an average display hue of the current image area corresponding to the backlight partition, and according to the average The range in which the hue is displayed determines the backlight adjustment object.
  • the backlight adjustment object includes a backlight of at least one of a red sub-pixel, a green sub-pixel, and a blue sub-pixel.
  • the backlight adjustment component 850 performs independent brightness adjustment on the backlight adjustment object according to the backlight adjustment signal corresponding to the backlight adjustment object, thereby reducing flicker discomfort caused by high and low voltage switching differences during driving, and avoiding frequent startup.
  • the backlight adjusts the problem of visible flicker that may be caused by the naked eye, and effectively improves the color shift defect caused by the refractive index mismatch of the large viewing angle of the liquid crystal display device.
  • each frame is sequentially displayed using two frames of images, each frame image is driven by a high and low phase voltage signal, and the high and low driving voltages of the first frame image and the second frame image are reversed, and A backlight brightness adjustment signal of the next picture is generated according to each driving voltage.
  • the average color purity of the current picture area corresponding to each backlight partition is calculated, and only when the average color purity is determined to be within the preset range, the corresponding image in each frame image of the next picture is
  • the backlight of each color sub-pixel in the backlight partition performs independent backlight adjustment, thereby reducing the flicker discomfort caused by the difference between the high and low voltage switching during driving, and avoiding the visible flicker that may be caused by frequent backlight adjustment.
  • the problem is to effectively improve the color shift defect caused by the mismatch of the refractive index of the liquid crystal display device at a large viewing angle.
  • the above liquid crystal display device is supplemented by the compensation of the brightness of each backlight partition M, which not only maintains the overall panel brightness and the uncompensated conventional driving brightness, but also realizes the Low color shift viewing angle compensation effect, and can avoid the difference between the high and low voltage switching in the original driving.
  • the phenomenon of flicker discomfort which is visible to the naked eye is effective, and the color shift defect caused by the refractive index mismatch of the large viewing angle of the liquid crystal display device is effectively improved.
  • the above liquid crystal display device can realize cooperative driving in the time domain and the spatial domain.
  • the pixels of the liquid crystal display device do not need to be further divided into primary and secondary sub-pixels, so that the process complexity of the display panel can be greatly reduced. Degree, and greatly improve the transmittance and resolution of the liquid crystal display panel, reducing the design of backlight cost.
  • the storage medium may be a non-volatile storage medium such as a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

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Abstract

一种液晶显示装置及其驱动方法，驱动方法包括：将每一幅画面使用两帧图像依序显示（S110）；每一帧图像上的相邻两个子像素的驱动电压为一高一低，且每一个子像素在第一帧图像中的驱动电压和在第二帧图像中的驱动电压为一高一低；根据每个背光分区对应的第一帧图像区域和第二帧图像区域的驱动电压确定每个背光分区的背光亮度调节信号（S120）；背光亮度调节信号为成组信号且组数与颜色子像素的种类数相同；计算每个背光分区对应的当前一幅画面区域的平均色彩纯度（S130）；判断每个背光分区的平均色彩纯度是否在预设范围内（S140）；若是，则根据背光分区的背光亮度调节信号对下一幅画面的各帧图像中的背光分区内的背光源进行亮度调节（S150）。

Description

液晶显示装置及其驱动方法
本申请要求于2016年12月27日提交中国专利局、申请号为201611228633.3、申请名称为“液晶显示器件及其驱动方法”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及液晶显示技术领域，特别是涉及一种液晶显示装置及其驱动方法。
背景技术
传统的大尺寸液晶显示装置多采用负型VA液晶或者IPS液晶技术。VA型液晶驱动在大视角下亮度随驱动电压快速饱和，从而导致视角色偏较为严重，进而影响画质品质。
发明内容
根据本申请的各种实施例，提供一种液晶显示装置及其驱动方法，能够改善视角色偏的缺点。
一种液晶显示装置的驱动方法，包括：
将每一幅画面使用两帧图像依序显示；所述两帧图像包括第一帧图像和第二帧图像；每一帧图像上的相邻两个子像素的驱动电压为一高一低，且每一个子像素在第一帧图像中的驱动电压和在第二帧图像中的驱动电压为一高一低；
根据每个背光分区对应的第一帧图像区域和第二帧图像区域的驱动电压确定每个背光分区的背光亮度调节信号；所述背光亮度调节信号为成组信号且组数与颜色子像素的种类数相同；
计算每个背光分区对应的当前一幅画面区域的平均色彩纯度；
判断每个背光分区的平均色彩纯度否在预设范围内；
若是，则根据所述背光分区的背光亮度调节信号对下一幅画面的各帧图像中的所述背光分区内的背光源进行亮度调节。
在其中一个实施例中，所述第一帧图像和所述第二帧图像的每一子像素的驱动电压根据每一幅画面的输入信号利用查找表进行查找获取。
在其中一个实施例中，还包括预先存储所述查找表的步骤。
在其中一个实施例中，所述根据每个背光分区对应的第一帧图像区域和第二帧图像区域的驱动电压确定每个背光分区的背光亮度调节信号的步骤包括：
统计每个背光分区对应的第一帧图像区域和第二帧图像区域中各种颜色子像素的平均驱动电压；
根据各背光分区的平均驱动电压、基准背光亮度信号和基准驱动电压求取背光亮度调节信号。
在其中一个实施例中，所述根据各背光分区的平均驱动电压、基准背光亮度信号和基准驱动电压求取背光亮度调节信号的步骤中，每个背光分区中的每一种颜色子像素的背光亮度调节信号的计算公式如下：
AM_P1*PM_ave1＝AM_P2*PM_ave2；
2*AM_P*PM_ave＝AM_P1*PM_ave1+AM_P2*PM_ave2；
其中，P表示目标颜色子像素；M表示所述背光分区的序号；AM_P1表示用于对下一幅画面的第一帧图像对应的背光分区M内的P子像素的背光源进行背光亮度调节的背光亮度调节信号；AM_P2表示用于对下一幅画面的第二帧图像对应的所述背光分区M内的所述P子像素的背光源进行背光亮度调节的背光亮度调节信号；PM_ave1表示当前一幅画面的第一帧图像对应的所述背光分区M内的所述P子像素的驱动电压的平均值；PM_ave2表示当前一幅画面的第二帧图像对应的所述背光分区M内的所述P子像素的驱动电压的平均值；AM_P表示当前一幅画面的图像对应的所述背光分区M内的所述P子像素的基准背光亮度信号；PM_ave表示当前一幅画面的图像上与所述背光分区M对应 的帧图形区域内的所述P子像素的基准驱动电压的平均值。
在其中一个实施例中，所述判断每个背光分区的平均色彩纯度是否在预设范围内的步骤中，若所述平均色彩纯度不在预设范围内，则不对所述背光分区的背光源进行亮度调节。
在其中一个实施例中，所述根据所述背光分区的背光亮度调节信号对下一幅画面的各帧图像中的所述背光分区内的背光源进行亮度调节步骤包括：
计算所述背光分区对应的当前一幅画面区域的平均显示色相；
根据所述平均显示色相所属色相范围确定背光调节对象；所述背光调节对象包括红色子像素、绿色子像素和蓝色子像素中的至少一种子像素的背光源；
根据与所述背光调节对象对应的背光亮度调节信号对所述背光调节对象进行独立的亮度调节。
在其中一个实施例中，所述根据所述平均显示色相所属色相范围确定背光调节对象的步骤中，
当所述平均显示色相在0°＜H≤45°或者315°＜H≤360°时，所述背光调节对象为红色子像素对应的背光源；
当所述平均显示色相在45°＜H≤135°时，所述背光调节对象为红色子像素和绿色子像素各自对应的背光源；
当所述平均显示色相在135°＜H≤205°时，所述背光调节对象为绿色子像素对应的背光源；
当所述平均显示色相在205°＜H≤245°时，所述背光调节对象为绿色子像素和蓝色子像素各自对应的背光源；
当所述平均显示色相在245°＜H≤295°时，所述背光调节对象为蓝色子像素对应的背光源；及
当所述平均显示色相在295°＜H≤315°时，所述背光调节对象为蓝色子像素和红色子像素对应的背光源；H表示平均显示色相。
一种液晶显示装置，包括：
显示面板；
背光模组，设置为向所述显示面板提供背光；所述背光模组划分为多个背光分区；
驱动部件，与所述显示面板连接，设置为将每一幅画面使用两帧图像依序显示；所述两帧图像包括第一帧图像和第二帧图像；每一帧图像上的相邻两个子像素的驱动电压为一高一低，且每一个子像素在第一帧图像中的驱动电压和在第二帧图像中的驱动电压为一高一低；
背光控制部件，与所述驱动部件连接；所述背光控制部件包括存储器和至少一个处理器；所述存储器中存储有可被所述至少一个处理器执行的计算机可执行指令，所述计算机可执行指令被所述至少一个处理器执行时，使得所述至少一个处理器执行以下步骤：
根据每个背光分区对应的第一帧图像区域和第二帧图像区域的驱动电压确定每个背光分区的背光亮度调节信号；所述背光亮度调节信号为成组信号且组数与颜色子像素的种类数相同；及
计算每个背光分区对应的当前一幅画面区域的平均色彩纯度，并判断每个背光分区的平均色彩纯度是否在预设范围内；以及
背光调节部件，分别与所述背光控制部件和所述背光模组连接；所述背光调节部件设置为在所述背光控制部件判断出所述背光分区的平均色彩纯度在预设范围时，根据所述背光分区的背光亮度调节信号对下一幅画面的各帧图像中的所述背光分区内的背光源进行亮度调节。
在其中一个实施例中，还包括存储部件；所述存储部件设置为存储查找表；所述查找表为输入信号与所述输入信号对应的第一帧图像、第二帧图像中的每一个子像素的驱动电压的对应关系表；所述驱动部件通过查找表获取所述第一帧图像和所述第二帧图像上的每一个子像素的驱动电压。
在其中一个实施例中，所述计算机可执行指令被所述至少一个处理器执行时，还使得所述至少一个处理器执行以下单元中的步骤：
统计单元，设置为统计每个所述背光分区对应的第一帧图像区域和第二 帧图像区域中各种颜色子像素的平均驱动电压；以及
计算单元，设置为根据各背光分区的所述平均驱动电压、基准背光亮度信号和基准驱动电压求取背光亮度调节信号。
在其中一个实施例中，求取每个背光分区中的每一种颜色子像素的背光亮度调节信号的计算公式如下：
AM_P1*PM_ave1＝AM_P2*PM_ave2；
2*AM_P*PM_ave＝AM_P1*PM_ave1+AM_P2*PM_ave2；
其中，P表示目标颜色子像素；M表示所述背光分区的序号；AM_P1表示设置为对下一幅画面的第一帧图像对应的背光分区M内的P子像素的背光源进行背光亮度调节的背光亮度调节信号；AM_P2表示设置为对下一幅画面的第二帧图像对应的所述背光分区M内的所述P子像素的背光源进行背光亮度调节的背光亮度调节信号；PM_ave1表示当前一幅画面的第一帧图像对应的所述背光分区M内的所述P子像素的驱动电压的平均值；PM_ave2当前一幅画面的第二帧图像对应的所述背光分区M内的所述P子像素的驱动电压的平均值；AM_P表示当前一幅画面的图像对应的所述背光分区M内的所述P子像素的基准背光亮度信号；PM_ave表示当前一幅画面的图像上与所述背光分区M对应的帧图形区域内的所述P子像素的基准驱动电压的平均值。
在其中一个实施例中，所述计算机可执行指令被所述至少一个处理器执行时，还使得所述至少一个处理器在判断出所述背光分区的平均色彩纯度不在预设范围内时，执行控制所述背光调节部件不对所述背光分区内的背光源进行亮度调节的步骤。
在其中一个实施例中，所述计算机可执行指令被所述至少一个处理器执行时，还使得所述至少一个处理器在判断出所述平均色彩纯度在预设范围内时，执行计算所述背光分区对应的当前一幅画面区域的平均显示色相，并根据所述平均显示色相所属范围确定背光调节对象的步骤；所述背光调节对象包括红色子像素、绿色子像素和蓝色子像素中的至少一种子像素的背光源；
所述背光调节部件还设置为根据与所述背光调节对象对应的背光调节信 号对所述背光调节对象进行独立的亮度调节。
在其中一个实施例中，所述计算机可执行指令被所述至少一个处理器执行时，还使得所述至少一个处理器执行：
当所述平均显示色相在0°＜H≤45°或者315°＜H≤360°时，确定所述背光调节对象为红色子像素对应的背光源；
当所述平均显示色相在45°＜H≤135°时，确定所述背光调节对象为红色子像素和绿色子像素各自对应的背光源；
当所述平均显示色相在135°＜H≤205°时，确定所述背光调节对象为绿色子像素对应的背光源；
当所述平均显示色相在205°＜H≤245°时，确定所述背光调节对象为绿色子像素和蓝色子像素各自对应的背光源；
当所述平均显示色相在245°＜H≤295°时，确定所述背光调节对象为蓝色子像素对应的背光源；及
当所述平均显示色相在295°＜H≤315°时，确定所述背光调节对象为蓝色子像素和红色子像素对应的背光源；H表示平均显示色相。
在其中一个实施例中，所述背光源为白色背光源、RGB背光源、RGBW背光源或者RGBY背光源。
一种液晶显示装置，包括：
显示面板；
背光模组，设置为向所述显示面板提供背光；所述背光模组划分为多个背光分区；
驱动部件，与所述显示面板连接，设置为将每一幅画面使用两帧图像依序显示；所述两帧图像包括第一帧图像和第二帧图像；每一帧图像上的相邻两个子像素的驱动电压为一高一低，且每一个子像素在第一帧图像中的驱动电压和在第二帧图像中的驱动电压为一高一低；
背光控制部件，与所述驱动部件连接；所述背光控制部件包括存储器和至少一个处理器；所述存储器中存储有可被所述至少一个处理器执行的计算 机可执行指令，所述计算机可执行指令被所述至少一个处理器执行时，使得所述至少一个处理器执行以下步骤：
根据每个背光分区对应的第一帧图像区域和第二帧图像区域的驱动电压确定每个背光分区的背光亮度调节信号；所述背光亮度调节信号为成组信号且组数与颜色子像素的种类数相同；及
计算每个背光分区对应的当前一幅画面区域的平均色彩纯度，并判断每个背光分区的平均色彩纯度是否在预设范围内；以及
背光调节部件，分别与所述背光控制部件和所述背光模组连接；所述背光调节部件设置为在所述背光控制部件判断出所述背光分区的平均色彩纯度在预设范围时，根据所述背光分区的背光亮度调节信号对下一幅画面的各帧图像中的所述背光分区内的背光源进行亮度调节；
其中，所述计算机可执行指令被所述至少一个处理器执行时，还使得所述至少一个处理器执行以下单元中的步骤：
统计单元，设置为统计每个背光分区对应的第一帧图像区域和第二帧图像区域中各种颜色子像素的平均驱动电压；以及
计算单元，设置为根据各背光分区的平均驱动电压、基准背光亮度信号和基准驱动电压求取背光亮度调节信号，计算公式如下
AM_P1*PM_ave1＝AM_P2*PM_ave2；
2*AM_P*PM_ave＝AM_P1*PM_ave1+AM_P2*PM_ave2；
P表示目标颜色子像素；M表示所述背光分区的序号；AM_P1表示设置为对下一幅画面的第一帧图像对应的背光分区M内的P子像素的背光源进行背光亮度调节的背光亮度调节信号；AM_P2表示设置为对下一幅画面的第二帧图像对应的所述背光分区M内的所述P子像素的背光源进行背光亮度调节的背光亮度调节信号；PM_ave1表示当前一幅画面的第一帧图像对应的所述背光分区M内的所述P子像素的驱动电压的平均值；PM_ave2当前一幅画面的第二帧图像对应的所述背光分区M内的所述P子像素的驱动电压的平均值；AM_P表示当前一幅画面的图像对应的所述背光分区M内的所述P子像素的基准背 光亮度信号；PM_ave表示当前一幅画面的图像上与所述背光分区M对应的帧图形区域内的所述P子像素的基准驱动电压的平均值。
在其中一个实施例中，所述计算机可执行指令被所述至少一个处理器执行时，还使得所述至少一个处理器在判断出所述平均色彩纯度在预设范围内时，执行计算所述背光分区对应的当前一幅画面区域的平均显示色相，并根据所述平均显示色相所属范围确定背光调节对象的步骤；所述背光调节对象包括红色子像素、绿色子像素和蓝色子像素中的至少一种子像素的背光源；
所述背光调节部件还设置为根据与所述背光调节对象对应的背光调节信号对所述背光调节对象进行独立的亮度调节。上述液晶显示装置及其驱动方法，将每一幅画面使用两帧图像依序显示，每一帧图像均采用高低相间的电压信号进行驱动，且第一帧图像和第二帧图像的高低驱动电压反转，并根据各驱动电压生成下一幅画面的背光亮度调节信号。同时，还会计算每个背光分区对应的当前一幅画面区域的平均色彩纯度，并仅在判断出该平均色彩纯度在预设范围内时，才对下一幅画面的各帧图像中的相应背光分区内的背光源进行背光调节，从而可以减少驱动时高低电压切换差异造成肉眼可视的闪烁不适现象，并且可以避免频繁启动背光源调节可能造成的肉眼可见闪烁的问题，有效改善液晶显示装置在大视角折射率不匹配造成的色偏缺点。
附图说明
为了更清楚地说明本申请实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他实施例的附图。
图1为一实施例中的液晶显示装置的驱动方法的流程图；
图2为图1中对液晶显示装置的背光区进行分区的示意图；
图3为图1中对液晶显示装置的显示区进行驱动的示意图；
图4和图5为图3中的局部放大图；
图6为图1中的步骤S120的具体流程图；
图7为图1中的步骤S150中采用的CIE LCH颜色空间***的示意图；
图8为图1中的步骤S150的具体流程图；
图9为一实施例中的液晶显示装置的结构框图；
图10为一实施例中的背光控制部件的结构框图。
具体实施方式
为了便于理解本申请，下面将参照相关附图对本申请进行更全面的描述。附图中给出了本申请的较佳实施例。但是，本申请可以以许多不同的形式来实现，并不限于本文所描述的实施例。相反地，提供这些实施例的目的是使对本申请的公开内容的理解更加透彻全面。
图1为一实施例中的液晶显示装置的驱动方法的流程图。该液晶显示装置可以为TN、OCB、VA型、曲面型液晶显示装置，但并不限于此。该液晶显示装置可以运用直下背光，背光源可以为白光、RGB三色光源、RGBW四色光源或者RGBY四色光源，但并不限于此。在本实施例中，液晶显示装置的背光区划分为多个背光分区，如图2所示。图2中，90表示背光模组(或者背光模组)。
参见图1，该方法包括以下步骤：
步骤S110，将每一幅画面使用两帧图像依序显示。
将每一幅画面frame_N(也即传统的一帧画面)使用两帧图像依序显示，也即将一幅画面在时序上分割为两帧图像。通过时序上对画面进行分割，可以实现帧频的倍频，也即将原来的60Hz倍频至120Hz。两帧图像分别为第一帧图像(frame_N-1)和第二帧图像(frame_N-2)。通过第一帧图像和第二帧图像相互补偿向用户显示与输入信号对应的画面。在本实施例中，每一帧图像上的相邻两个子像素的驱动电压为一高一低，并且每一个子像素在第一帧图像中的驱动电压和在第二帧图像中的驱动为一高一低。也即，第一帧图像的各子像素的驱动电压反转形成第二帧图像的各子像素的驱动电压。第一帧 图像和第二帧图像中的每一子像素的驱动电压可以利用查找表(LUT，Look UP Table)查找获取。具体地，液晶显示装置内会预先将查找表存储在硬件帧缓存(frame buffer)里面。查找表为画面输入信号和与该输入信号对应的第一帧图像、第二帧图像的每一子像素的驱动电压的对应关系表。以8bit驱动信号来看，每一R/G/B输入信号输入颜色灰度值0～255对应有256对高低电压信号，共有3*256对高电压信号RTH/GTH/BTH与低电压信号RTL/GTL/BTL。因此，根据输入信号中每一子像素的颜色灰度值可以查找对应的高驱动电压和对应的低驱动电压，从而将该高驱动电压驱动第一帧图像中对应的子像素且将该低驱动电压驱动第二帧图像中对应的子像素，或者将该低驱动电压驱动第一帧图像中对应的子像素且将该高驱动电压驱动第二帧图像中对应的子像素，同时相邻两个子像素采用高低驱动电压相间的驱动方式进行驱动，如图3所示。其中，图4为图3中的第一帧中的局部放大图，图5为图3中第二帧中的局部放大图。
步骤S120，根据每个背光分区对应的第一帧图像区域和第二帧图像区域的驱动电压确定每个背光分区的背光亮度调节信号。
背光亮度调节信号用于对下一幅画面中的两帧图像进行背光亮度调节，以降低画面的视角色偏。背光亮度调节信号为成组信号(AM_P1和AM_P2，P表示目标颜色子像素)，以分别调节第一帧图像和第二帧图像对应的背光分区的背光亮度。并且，背光亮度调节信号的组数与颜色子像素的种类相同，以对各种颜色子像素进行独立的背光亮度控制。例如，在本实施例中，颜色子像素包括红色子像素(R子像素)、绿色子像素(G子像素)和蓝色子像素(B子像素)，因此每一组背光亮度调节信号均包括R子像素背光亮度调节信号组、G子像素背光亮度调节信号组和B子像素背光亮度调节信号，以对各背光分区内的各种颜色子像素进行独立的背光亮度调节控制。
在本实施例中，确定背光亮度调节信号的流程如图6所示，包括步骤S210和步骤S220。
步骤S210，统计每个背光分区对应的第一帧图像区域和第二帧图像区域 中各种颜色子像素的平均驱动电压。
每个背光分区内对应的第一帧图像区域中的每种颜色子像素的平均驱动电压的计算公式如下：
PM_ave1＝Ave(PM-n_TL，PM-n+1_TH，PM_n+2_TL，...)，n＝1，2，3......。
其中，P表示目标颜色子像素，M表示背光分区的序号，ave1表示第一帧图像的平均驱动电压值；n表示P子像素在背光分区M中的顺序编号。
具体地，各种颜色子像素的平均驱动电压的计算如下：
RM_ave1＝Ave(RM-n_TL，RM-n+1_TH，RM_n+2_TL，...)，n＝1，2，3...；
GM_ave1＝Ave(GM-n_TH，GM-n+1_TL，GM_n+2_TH，...)，n＝1，2，3...；
BM_ave1＝Ave(BM-n_TL，BM-n+1_TH，BM_n+2_TL，...)，n＝1，2，3...。
步骤S220，根据各背光分区的平均驱动电压、基准背光亮度信号和基准驱动电压求取背光亮度调节信号。
基准背光亮度信号是指不做高低电压补偿时(也即传统的驱动方式)所需的背光亮度信号。基准驱动电压是指不做高低电压补偿时的各种子像素的驱动电压。由于每个分区内的各种颜色子像素的对应的背光源为独立控制，因此需要求取每个分区内的各种颜色子像素对应的背光源的背光亮度调节信号。每个背光分区M中的每一种颜色子像素的背光亮度调节信号的计算公式如下：
AM_P1*PM_ave1＝AM_P2*PM_ave2；
2*AM_P*PM_ave＝AM_P1*PM_ave1+AM_P2*PM_ave2。
其中，P表示目标颜色子像素；M表示背光分区的序号。AM_P1表示用于对下一幅画面的第一帧图像对应的背光分区M内的P子像素的背光源进行背光亮度调节的背光亮度调节信号。AM_P2表示用于对下一幅画面的第二帧图像对应的背光分区M内的P子像素的背光源进行背光亮度调节的背光亮度调节信号。PM_ave1表示当前一幅画面的第一帧图像对应的背光分区M内的P子像素的驱动电压的平均值。在本实施例中，由于子像素的驱动电压与输入信号(也即对应颜色的灰阶值)匹配，从而使得驱动电压的平均值能作为该颜色 子像素的视角亮度的评价参数。PM_ave2表示当前一幅画面的第二帧图像对应的背光分区M内的P子像素的驱动电压的平均值。AM_P表示当前一幅画面的图像对应的背光分区M内的P子像素的基准背光亮度信号。PM_ave表示当前一幅画面的图像上与背光分区M对应的帧图形区域内的P子像素的基准驱动电压的平均值。具体地，PM_ave1＝Ave(Pn+Pn+1+Pn+2+...)，n＝1，2，3......。
在本实施例中，每一帧图像的一个像素包括R子像素、G子像素和B子像素。因此，对应的需要求取每个背光分区中各种颜色子像素的背光源的背光亮度调节信号，具体如下：
背光分区M内的R子像素的背光亮度调节信号AM_R1和AM_R2的求取公式为
AM_R1*RM_ave1＝AM_R2*RM_ave2；
2*AM_R*RM_ave＝AM_R1*RM_ave1+AM_R2*RM_ave2；
背光分区M内的G子像素的背光亮度调节信号AM_G1和AM_G2的求取公式为
AM_G1*GM_ave1＝AM_G2*GM_ave2；
2*AM_G*GM_ave＝AM_G1*GM_ave1+AM_G2*GM_ave2；
背光分区M内的B子像素的背光亮度调节信号AM_B1和AM_B2的求取公式为
AM_B1*BM_ave1＝AM_B2*BM_ave2；
2*AM_B*BM_ave＝AM_B1*BM_ave1+AM_B2*BM_ave2。
步骤S130，计算每个背光分区对应的当前一幅画面区域的平均色彩纯度。
色彩纯度是基于CIE LCH颜色空间***并参考CIE规范的各色彩空间坐标的函数求取得到的。具体地，L＝f1(R、G、B)，C＝f2(R、G、B)，H＝f3(R、G、B)，上述函数关系根据CIE规范即可获知。CIE LCH颜色空间***如图7所示。图7中仅给出了主要颜色代表颜色如红色、黄色、绿色和蓝色的位置示意，而并未给出其他颜色的位置示意。由于CIE LCH颜色空间***是本领域技术人员熟知的一个颜色空间***，故仅提供图7本领域技术人员也可以 知晓完整的CIE LCH颜色空间***的情况。图7中，L表示亮度，C表示色彩纯度，代表颜色的鲜艳程度。C的范围表示在0到100，100代表色彩最为鲜艳。C的数值在一定程度表现了液晶显示装置的显示驱动时的电压信号，因此在求取每一幅画面的平均色彩纯度时，可以通过求取平均的驱动电压来计算获得。
具体地，平均色彩纯度的求取需要先求取每个背光分区对应的当前一幅画面区域的各种颜色子像素的平均驱动电压。也即将每个背光分区对应的第一帧图像区域和第二帧图像区域的各种颜色子像素的驱动电压进行求和并取平均值。在本实施例中，由于第二帧图像的驱动电压是第一帧图像的驱动电压的反转，也即两帧图像的平均驱动电压相同。因此，只需要求取一帧图像中的平均驱动电压即可获取该背光分区内对应的当前一幅画面区域的该种颜色子像素的平均驱动电压，具体计算公式如下：
R_ave＝Ave(RM_1+RM_2+...+RM_n)；
G_ave＝Ave(GM_1+GM_2+...+GM_n)；
B_ave＝Ave(BM_1+BM_2+...+BM_n)。
其中，M表示背光分区的序号，n表示该子像素在背光分区M中所有该种颜色子像素中的顺序编号。因此，根据函数关系C＝f2(R、G、B)，将上述结果带入即可求得平均色彩纯度C：
C＝f2(R_ave、G_ave、B_ave)。
步骤S140，判断各背光分区的平均色彩纯度是否在预设范围内。
预设范围也即CTL和CTH可以根据需要设定。判断平均色彩纯度C是否满足：
CTL≤C≤CTH。
若当前背光分区的平均色彩纯度C满足上述条件，则对该背光分区执行步骤S150，否则对该背光分区执行步骤S160。通过对平均色彩纯度进行判断，可以避免频繁启动背光源调节可能造成的肉眼可见闪烁的问题。
步骤S150，根据该背光分区的背光亮度调节信号对下一幅画面的各帧图 像中的该背光分区内的背光源进行亮度调节。
在一实施例中，可以根据生成的多组背光亮度调节信号对各种颜色子像素的背光源均进行独立的背光调节。调节过程中，根据AM_R1、AM_G1和AM_B1对下一幅画面中的第一帧图像的相应背光分区M内的R子像素、G子像素和B子像素的背光源进行独立调节，并根据AM_R2、AM_G2和AM_B2对下一幅画面中的第二帧图像的相应背光分区M内的R子像素、G子像素和B子像素的背光源进行独立调节，以使得补偿后的画面亮度与不进行高低电压补偿(也即传统驱动)时的画面亮度表现相同。通过独立的背光源控制，可以减少驱动时高低电压切换差异造成肉眼可视的闪烁不适现象，有效改善液晶显示装置在大视角折射率不匹配造成的色偏缺点。
在本实施例中，步骤S150包括以下子步骤，如图8所示。
步骤S310，计算该背光分区对应的当前一幅画面区域的平均显示色相。
参见图7，在CIE LCH颜色空间***中，H表示显示色相，也即颜色代表。0～360°代表不同色相颜色呈现，其中定义0°为红色，90°为黄色，180°为绿色，270°为蓝色。平均显示色相H的求取方式和平均色彩纯度的求取方式相同，均是先求取该背光分区内对应的当前一幅画面区域的该种颜色子像素的平均驱动电压R_ave、G_ave和B_ave，然后根据函数关系H＝f3(R、G、B)即可求取。具体如下：
H＝f3(R_ave、G_ave、B_ave)。
步骤S320，根据该平均显示色相所属色相范围确定背光调节对象。
预先将色相值划分为多个范围区域。划分方法可以根据需要设定。在本实施例中，将色相值划分为6个区域，每个区域对应各自的背光调节对象。具体地，当0°＜H≤45°或者315°＜H≤360°时，背光调节对象为红色子像素对应的背光源；当45°＜H≤135°时，背光调节对象为红色子像素和绿色子像素各自对应的背光源；当135°＜H≤205°时，背光调节对象为绿色子像素对应的背光源；当205°＜H≤245°时，背光调节对象为绿色子像素和蓝色子像素各自对应的背光源；当245°＜H≤295°时，背光调节对象为 蓝色子像素对应的背光源；当295°＜H≤315°时，背光调节对象为蓝色子像素和红色子像素对应的背光源。
步骤S330，根据与该背光调节对象对应的背光亮度调节信号对该背光亮度调节对象进行独立的亮度调节。
具体地，当0°＜H≤45°或者315°＜H≤360°时，背光调节对象为红色子像素对应的背光源，也即根据AM_R1和AM_R2对该背光分区内的红色子像素的背光源进行背光调节，而不对其他颜色子像素的背光亮度做调整。当45°＜H≤135°时，背光调节对象为红色子像素和绿色子像素各自对应的背光源，也即根据AM_R1和AM_R2、AM_G1和AM_G2分别对红色子像素和蓝色子像素的背光源进行独立的背光调节。其他情况与上述情形的处理过程类似，此处不再重复一一介绍。
步骤S160，不对该背光分区进行背光亮度调节。
上述液晶显示装置的驱动方法，将每一幅画面使用两帧图像依序显示，每一帧图像均采用高低相间的电压信号进行驱动，且第一帧图像和第二帧图像的高低驱动电压反转，并根据各驱动电压生成下一幅画面的背光亮度调节信号。同时，还会计算每个背光分区对应的当前一幅画面区域的平均色彩纯度，并仅在判断出该平均色彩纯度在预设范围内时，才对下一幅画面的各帧图像中的相应背光分区内的背光源进行背光调节，从而可以减少驱动时高低电压切换差异造成肉眼可视的闪烁不适现象，并且可以避免频繁启动背光源调节可能造成的肉眼可见闪烁的问题，有效改善液晶显示装置在大视角折射率不匹配造成的色偏缺点。
上述驱动方法，辅以各背光分区M亮度的补偿，不仅维持整体面板亮度与不补偿的传统驱动亮度没有变化，还可以实现Low color shift视角补偿效果，又可以避免原先驱动时高低电压切换差异造成肉眼可视的闪烁不适现象，有效改善液晶显示装置在大视角折射率不匹配造成的色偏缺点。上述驱动方法可以实现时域和空间域上的配合驱动。并且，通过采用上述驱动方法，液晶显示装置的像素不需要再分为主要和次要子像素，从而可以大大降低显示 面板的工艺复杂度，且大大提升了液晶显示面板的穿透率和解析度，减少了背光成本的设计。
本申请还提供一种液晶显示装置，如图9所示。该液晶显示装置可以执行上述驱动方法。该液晶显示装置包括显示面板810、背光模组820、还包括驱动部件830、背光控制部件840和背光调节部件850。其中，显示面板810和驱动部件830可以集成在显示面板上，背光模组820、背光控制部件840和背光调节部件850则可以集成在背光模组上。可以理解，各部件的集成方式并不限于此。
显示面板810可以采用TN、OCB、VA型TFT显示面板，但并不限于此。显示面板810可以为具有曲面面板的显示面板。
背光模组820设置为提供背光。背光模组820可以运用直下背光，背光源可以为白光、RGB三色光源、RGBW四色光源或者RGBY四色光源，但并不限于此。背光模组820的背光区划分为多个背光分区，如图2所示。
驱动部件830与显示面板810连接。驱动部件830设置为将每一幅画面使用两帧图像显示。两帧图像分别为第一帧图像和第二帧图像。通过第一帧图像和第二帧图像相互补偿向用户显示与输入信号对应的画面。在本实施例中，每一帧图像上的相邻两个子像素的驱动电压为一高一低，并且每一个子像素在第一帧图像中的驱动电压和在第二帧图像中的驱动为一高一低。也即，第一帧图像的各子像素的驱动电压反转形成第二帧图像的各子像素的驱动电压。驱动部件730驱动各子像素的驱动电压可以利用查找表查找获取。具体地，液晶显示装置内会预先将查找表存储在硬件帧缓存里面。该查找表为输入信号和与该输入信号对应的第一帧图像、第二帧图像的每一子像素的驱动电压的对应关系表。驱动部件730包括时序控制电路(TCON，timing controller的缩写)。在一实施例中，该液晶显示装置还包括存储器件860，设置为存储该查找表。
背光控制部件840与驱动部件830连接。背光控制部件840设置为根据每个背光分区对应的第一帧图像区域和第二帧图像区域的驱动电压确定每个 背光分区的背光亮度调节信号。在一实施例中，背光控制部件840包括存储器和至少一个处理器。存储器中存储有可被至少一个处理器执行的计算机可执行指令。该计算机可执行指令被至少一个处理器执行，以使得至少一个的处理器执行根据每个背光分区对应的第一帧图像区域和第二帧图像区域的驱动电压确定每个背光分区的背光亮度调节信号的步骤。背光亮度调节信号为成组信号(AM_P1和AM_P2，P表示目标颜色子像素)，以分别调节第一帧图像和第二帧图像的对应背光分区的背光亮度。并且，背光亮度调节信号的组数与颜色子像素的种类相同，以对各种颜色子像素进行独立的背光亮度控制。例如，在本实施例中，颜色子像素包括红色子像素(R子像素)、绿色子像素(G子像素)和蓝色子像素(B子像素)，因此每一组背光亮度调节信号均包括R子像素背光亮度调节信号组、G子像素背光亮度调节信号组和B子像素背光亮度调节信号，以对各背光分区内的各种颜色子像素进行独立的背光亮度调节控制。
进一步地，背光控制部件840中存储器中存储的计算机可执行指令被至少一个处理器执行时，还使得至少一个处理器执行以下单元中的步骤，如图10所示。其中，统计单元842设置为计算每个背光分区内对应的第一帧图像区域中的每种颜色子像素的平均驱动电压的公式如下：
PM_ave1＝Ave(PM-n_TL，PM-n+1_TH，PM_n+2_TL，...)，n＝1，2，3......。
其中，P表示目标颜色子像素，M表示背光分区的序号，ave1表示第一帧图像的平均驱动电压值；n表示P子像素在背光分区M中的顺序编号。
具体地，各种颜色子像素的平均驱动电压的计算如下：
RM_ave1＝Ave(RM-n_TL，RM-n+1_TH，RM_n+2_TL，...)，n＝1，2，3...；
GM_ave1＝Ave(GM-n_TH，GM-n+1_TL，GM_n+2_TH，...)，n＝1，2，3...；
BM_ave1＝Ave(BM-n_TL，BM-n+1_TH，BM_n+2_TL，...)，n＝1，2，3...。
计算单元844设置为根据各背光分区的平均驱动电压、基准背光亮度信号和基准驱动电压求取背光亮度调节信号。基准背光亮度信号是指不做高低电压补偿时(也即传统的驱动方式)所需的背光亮度信号。基准驱动电压是 指不做高低电压补偿时的各种子像素的驱动电压。由于每个分区内的各种颜色子像素的对应的背光源为独立控制，因此需要求取每个分区内的各种颜色子像素对应的背光源的背光亮度调节信号。每个背光分区M中的每一种颜色子像素的背光亮度调节信号的计算公式如下：
AM_P1*PM_ave1＝AM_P2*PM_ave2；
2*AM_P*PM_ave＝AM_P1*PM_ave1+AM_P2*PM_ave2。
其中，P表示目标颜色子像素；M表示背光分区的序号。AM_P1表示用于对下一幅画面的第一帧图像对应的背光分区M内的P子像素的背光源进行背光亮度调节的背光亮度调节信号。AM_P2表示用于对下一幅画面的第二帧图像对应的背光分区M内的P子像素的背光源进行背光亮度调节的背光亮度调节信号。PM_ave1表示当前一幅画面的第一帧图像对应的背光分区M内的P子像素的驱动电压的平均值。在本实施例中，由于子像素的驱动电压与输入信号(也即对应颜色的灰阶值)匹配，从而使得驱动电压的平均值能作为该颜色子像素的视角亮度的评价参数。PM_ave2表示当前一幅画面的第二帧图像对应的背光分区M内的P子像素的驱动电压的平均值。AM_P表示当前一幅画面的图像对应的背光分区M内的P子像素的基准背光亮度信号。PM_ave表示当前一幅画面的图像上与背光分区M对应的帧图形区域内的P子像素的基准驱动电压的平均值。具体地，PM_ave1＝Ave(Pn+Pn+1+Pn+2+...)，n＝1，2，3......。
更进一步地，存储器中存储的计算机可执行指令被至少一个处理器执行时，还使得至少一个处理器执行判断单元846中的步骤。在本实施例中，计算单元844还设置为计算每个背光分区对应的当前一幅画面区域的平均色彩纯度。判断单元846设置为判断每个背光分区的平均色彩纯度是否在预设范围内，并仅在判断出该背光分区的平均色彩纯度在预设范围内时，才会控制背光调节部件850根据该背光分区的背光亮度调节信号对下一幅画面的各帧图像中的该背光分区内的背光源进行亮度调节，以使得补偿后的画面亮度与不进行高低电压补偿时的画面亮度表现相同。反之则不控制背光调节部件850对该背光分区执行背光亮度调节。在一实施例中，背光调节部件850会根据 每个背光分区的背光亮度调节信号对下一幅画面的各帧图像中对应的背光分区内的各种颜色子像素的背光源进行独立的亮度调节，以使得补偿后的画面亮度与不进行高低电压补偿时的画面亮度表现相同。
在本实施例中，背光控制部件840还设置为在确定该背光分区需要进行背光亮度补偿时，通过计算单元844先计算该背光分区对应的当前一幅画面区域的平均显示色相，并根据该平均显示色相所属范围确定背光调节对象。背光调节对象包括红色子像素、绿色子像素和蓝色子像素中的至少一种子像素的背光源。背光调节部件850则根据与该背光调节对象对应的背光调节信号对该背光调节对象进行独立的亮度调节，从而可以减少驱动时高低电压切换差异造成肉眼可视的闪烁不适现象，并且可以避免频繁启动背光源调节可能造成的肉眼可见闪烁的问题，有效改善液晶显示装置在大视角折射率不匹配造成的色偏缺点。
上述液晶显示装置，将每一幅画面使用两帧图像依序显示，每一帧图像均采用高低相间的电压信号进行驱动，且第一帧图像和第二帧图像的高低驱动电压反转，并根据各驱动电压生成下一幅画面的背光亮度调节信号。同时，还会计算每个背光分区对应的当前一幅画面区域的平均色彩纯度，并仅在判断出该平均色彩纯度在预设范围内时，才对下一幅画面的各帧图像中的相应背光分区内的各种颜色子像素的背光源进行独立的背光调节，从而可以减少驱动时高低电压切换差异造成肉眼可视的闪烁不适现象，并且可以避免频繁启动背光源调节可能造成的肉眼可见闪烁的问题，有效改善液晶显示装置在大视角折射率不匹配造成的色偏缺点。
上述液晶显示装置，辅以各背光分区M亮度的补偿，不仅维持整体面板亮度与不补偿的传统驱动亮度没有变化，还可以实现Low color shift视角补偿效果，又可以避免原先驱动时高低电压切换差异造成肉眼可视的闪烁不适现象，有效改善液晶显示装置在大视角折射率不匹配造成的色偏缺点。上述液晶显示装置可以实现时域和空间域上的配合驱动。并且，液晶显示装置的像素不需要再分为主要和次要子像素，从而可以大大降低显示面板的工艺复杂 度，且大大提升了液晶显示面板的穿透率和解析度，减少了背光成本的设计。
本领域普通技术人员可以理解实现上述实施例方法中的全部或部分流程，是可以通过计算机程序来指令相关的硬件来完成，所述的程序可存储于一计算机可读取存储介质中，该程序在执行时，可包括如上述各方法的实施例的流程。其中，所述的存储介质可为磁碟、光盘、只读存储记忆体(Read-Only Memory，ROM)等非易失性存储介质，或随机存储记忆体(Random Access Memory，RAM)等。
以上所述实施例的各技术特征可以进行任意的组合，为使描述简洁，未对上述实施例中的各个技术特征所有可能的组合都进行描述，然而，只要这些技术特征的组合不存在矛盾，都应当认为是本说明书记载的范围。
以上所述实施例仅表达了本申请的几种实施方式，其描述较为具体和详细，但并不能因此而理解为对申请专利范围的限制。应当指出的是，对于本领域的普通技术人员来说，在不脱离本申请构思的前提下，还可以做出若干变形和改进，这些都属于本申请的保护范围。因此，本申请专利的保护范围应以所附权利要求为准。

Claims (18)

  1. 一种液晶显示装置的驱动方法，包括：
    将每一幅画面使用两帧图像依序显示；所述两帧图像包括第一帧图像和第二帧图像；每一帧图像上的相邻两个子像素的驱动电压为一高一低，且每一个子像素在第一帧图像中的驱动电压和在第二帧图像中的驱动电压为一高一低；
    根据每个背光分区对应的第一帧图像区域和第二帧图像区域的驱动电压确定每个背光分区的背光亮度调节信号；所述背光亮度调节信号为成组信号且组数与颜色子像素的种类数相同；
    计算每个背光分区对应的当前一幅画面区域的平均色彩纯度；
    判断每个背光分区的平均色彩纯度否在预设范围内；
    若是，则根据所述背光分区的背光亮度调节信号对下一幅画面的各帧图像中的所述背光分区内的背光源进行亮度调节。
  2. 根据权利要求1所述的方法，其中，所述第一帧图像和所述第二帧图像的每一子像素的驱动电压根据每一幅画面的输入信号利用查找表进行查找获取。
  3. 根据权利要求2所述的方法，还包括预先存储所述查找表的步骤。
  4. 根据权利要求1所述的方法，其中，所述根据每个背光分区对应的第一帧图像区域和第二帧图像区域的驱动电压确定每个背光分区的背光亮度调节信号的步骤包括：
    统计每个背光分区对应的第一帧图像区域和第二帧图像区域中各种颜色子像素的平均驱动电压；
    根据各背光分区的平均驱动电压、基准背光亮度信号和基准驱动电压求取背光亮度调节信号。
  5. 根据权利要求4所述的方法，其中，所述根据各背光分区的平均驱动电压、基准背光亮度信号和基准驱动电压求取背光亮度调节信号的步骤中，每个背光分区中的每一种颜色子像素的背光亮度调节信号的计算公式如下：
    AM_P1*PM_ave1＝AM_P2*PM_ave2；
    2*AM_P*PM_ave＝AM_P1*PM_ave1+AM_P2*PM_ave2；
    其中，P表示目标颜色子像素；M表示所述背光分区的序号；AM_P1表示用于对下一幅画面的第一帧图像对应的背光分区M内的P子像素的背光源进行背光亮度调节的背光亮度调节信号；AM_P2表示用于对下一幅画面的第二帧图像对应的所述背光分区M内的所述P子像素的背光源进行背光亮度调节的背光亮度调节信号；PM_ave1表示当前一幅画面的第一帧图像对应的所述背光分区M内的所述P子像素的驱动电压的平均值；PM_ave2表示当前一幅画面的第二帧图像对应的所述背光分区M内的所述P子像素的驱动电压的平均值；AM_P表示当前一幅画面的图像对应的所述背光分区M内的所述P子像素的基准背光亮度信号；PM_ave表示当前一幅画面的图像上与所述背光分区M对应的帧图形区域内的所述P子像素的基准驱动电压的平均值。
  6. 根据权利要求1所述的方法，其中，所述判断每个背光分区的平均色彩纯度是否在预设范围内的步骤中，若所述平均色彩纯度不在预设范围内，则不对所述背光分区的背光源进行亮度调节。
  7. 根据权利要求1所述的方法，其中，所述根据所述背光分区的背光亮度调节信号对下一幅画面的各帧图像中的所述背光分区内的背光源进行亮度调节步骤包括：
    计算所述背光分区对应的当前一幅画面区域的平均显示色相；
    根据所述平均显示色相所属色相范围确定背光调节对象；所述背光调节对象包括红色子像素、绿色子像素和蓝色子像素中的至少一种子像素的背光源；
    根据与所述背光调节对象对应的背光亮度调节信号对所述背光调节对象进行独立的亮度调节。
  8. 根据权利要求7所述的方法，其中，所述根据所述平均显示色相所属色相范围确定背光调节对象的步骤中，
    当所述平均显示色相在0°＜H≤45°或者315°＜H≤360°时，所述背 光调节对象为红色子像素对应的背光源；
    当所述平均显示色相在45°＜H≤135°时，所述背光调节对象为红色子像素和绿色子像素各自对应的背光源；
    当所述平均显示色相在135°＜H≤205°时，所述背光调节对象为绿色子像素对应的背光源；
    当所述平均显示色相在205°＜H≤245°时，所述背光调节对象为绿色子像素和蓝色子像素各自对应的背光源；
    当所述平均显示色相在245°＜H≤295°时，所述背光调节对象为蓝色子像素对应的背光源；及
    当所述平均显示色相在295°＜H≤315°时，所述背光调节对象为蓝色子像素和红色子像素对应的背光源；H表示平均显示色相。
  9. 一种液晶显示装置，包括：
    显示面板；
    背光模组，设置为向所述显示面板提供背光；所述背光模组划分为多个背光分区；
    驱动部件，与所述显示面板连接，设置为将每一幅画面使用两帧图像依序显示；所述两帧图像包括第一帧图像和第二帧图像；每一帧图像上的相邻两个子像素的驱动电压为一高一低，且每一个子像素在第一帧图像中的驱动电压和在第二帧图像中的驱动电压为一高一低；
    背光控制部件，与所述驱动部件连接；所述背光控制部件包括存储器和至少一个处理器；所述存储器中存储有可被所述至少一个处理器执行的计算机可执行指令，所述计算机可执行指令被所述至少一个处理器执行时，使得所述至少一个处理器执行以下步骤：
    根据每个背光分区对应的第一帧图像区域和第二帧图像区域的驱动电压确定每个背光分区的背光亮度调节信号；所述背光亮度调节信号为成组信号且组数与颜色子像素的种类数相同；及
    计算每个背光分区对应的当前一幅画面区域的平均色彩纯度，并判断 每个背光分区的平均色彩纯度是否在预设范围内；以及
    背光调节部件，分别与所述背光控制部件和所述背光模组连接；所述背光调节部件设置为在所述背光控制部件判断出所述背光分区的平均色彩纯度在预设范围时，根据所述背光分区的背光亮度调节信号对下一幅画面的各帧图像中的所述背光分区内的背光源进行亮度调节。
  10. 根据权利要求9所述的液晶显示装置，还包括存储部件；所述存储部件设置为存储查找表；所述查找表为输入信号与所述输入信号对应的第一帧图像、第二帧图像中的每一个子像素的驱动电压的对应关系表；所述驱动部件通过查找表获取所述第一帧图像和所述第二帧图像上的每一个子像素的驱动电压。
  11. 根据权利要求9所述的液晶显示装置，其中，所述计算机可执行指令被所述至少一个处理器执行时，还使得所述至少一个处理器执行以下单元中的步骤：
    统计单元，设置为统计每个所述背光分区对应的第一帧图像区域和第二帧图像区域中各种颜色子像素的平均驱动电压；以及
    计算单元，设置为根据各背光分区的所述平均驱动电压、基准背光亮度信号和基准驱动电压求取背光亮度调节信号。
  12. 根据权利要求11所述的液晶显示装置，其中，求取每个背光分区中的每一种颜色子像素的背光亮度调节信号的计算公式如下：
    AM_P1*PM_ave1＝AM_P2*PM_ave2；
    2*AM_P*PM_ave＝AM_P1*PM_ave1+AM_P2*PM_ave2；
    其中，P表示目标颜色子像素；M表示所述背光分区的序号；AM_P1表示设置为对下一幅画面的第一帧图像对应的背光分区M内的P子像素的背光源进行背光亮度调节的背光亮度调节信号；AM_P2表示设置为对下一幅画面的第二帧图像对应的所述背光分区M内的所述P子像素的背光源进行背光亮度调节的背光亮度调节信号；PM_ave1表示当前一幅画面的第一帧图像对应的所述背光分区M内的所述P子像素的驱动电压的平均值；PM_ave2当前一幅画面的 第二帧图像对应的所述背光分区M内的所述P子像素的驱动电压的平均值；AM_P表示当前一幅画面的图像对应的所述背光分区M内的所述P子像素的基准背光亮度信号；PM_ave表示当前一幅画面的图像上与所述背光分区M对应的帧图形区域内的所述P子像素的基准驱动电压的平均值。
  13. 根据权利要求9所述的液晶显示装置，其中，所述计算机可执行指令被所述至少一个处理器执行时，还使得所述至少一个处理器在判断出所述背光分区的平均色彩纯度不在预设范围内时，执行控制所述背光调节部件不对所述背光分区内的背光源进行亮度调节的步骤。
  14. 根据权利要求9所述的液晶显示装置，其中，所述计算机可执行指令被所述至少一个处理器执行时，还使得所述至少一个处理器在判断出所述平均色彩纯度在预设范围内时，执行计算所述背光分区对应的当前一幅画面区域的平均显示色相，并根据所述平均显示色相所属范围确定背光调节对象的步骤；所述背光调节对象包括红色子像素、绿色子像素和蓝色子像素中的至少一种子像素的背光源；
    所述背光调节部件还设置为根据与所述背光调节对象对应的背光调节信号对所述背光调节对象进行独立的亮度调节。
  15. 根据权利要求14所述的液晶显示装置，其中，所述计算机可执行指令被所述至少一个处理器执行时，还使得所述至少一个处理器执行：
    当所述平均显示色相在0°＜H≤45°或者315°＜H≤360°时，确定所述背光调节对象为红色子像素对应的背光源；
    当所述平均显示色相在45°＜H≤135°时，确定所述背光调节对象为红色子像素和绿色子像素各自对应的背光源；
    当所述平均显示色相在135°＜H≤205°时，确定所述背光调节对象为绿色子像素对应的背光源；
    当所述平均显示色相在205°＜H≤245°时，确定所述背光调节对象为绿色子像素和蓝色子像素各自对应的背光源；
    当所述平均显示色相在245°＜H≤295°时，确定所述背光调节对象为 蓝色子像素对应的背光源；及
    当所述平均显示色相在295°＜H≤315°时，确定所述背光调节对象为蓝色子像素和红色子像素对应的背光源；H表示平均显示色相。
  16. 根据权利要求9所述的液晶显示装置，其中，所述背光源为白色背光源、RGB背光源、RGBW背光源或者RGBY背光源。
  17. 一种液晶显示装置，包括：
    显示面板；
    背光模组，设置为向所述显示面板提供背光；所述背光模组划分为多个背光分区；
    驱动部件，与所述显示面板连接，设置为将每一幅画面使用两帧图像依序显示；所述两帧图像包括第一帧图像和第二帧图像；每一帧图像上的相邻两个子像素的驱动电压为一高一低，且每一个子像素在第一帧图像中的驱动电压和在第二帧图像中的驱动电压为一高一低；
    背光控制部件，与所述驱动部件连接；所述背光控制部件包括存储器和至少一个处理器；所述存储器中存储有可被所述至少一个处理器执行的计算机可执行指令，所述计算机可执行指令被所述至少一个处理器执行时，使得所述至少一个处理器执行以下步骤：
    根据每个背光分区对应的第一帧图像区域和第二帧图像区域的驱动电压确定每个背光分区的背光亮度调节信号；所述背光亮度调节信号为成组信号且组数与颜色子像素的种类数相同；及
    计算每个背光分区对应的当前一幅画面区域的平均色彩纯度，并判断每个背光分区的平均色彩纯度是否在预设范围内；以及
    背光调节部件，分别与所述背光控制部件和所述背光模组连接；所述背光调节部件设置为在所述背光控制部件判断出所述背光分区的平均色彩纯度在预设范围时，根据所述背光分区的背光亮度调节信号对下一幅画面的各帧图像中的所述背光分区内的背光源进行亮度调节；
    其中，所述计算机可执行指令被所述至少一个处理器执行时，还使得所 述至少一个处理器执行以下单元中的步骤：
    统计单元，设置为统计每个背光分区对应的第一帧图像区域和第二帧图像区域中各种颜色子像素的平均驱动电压；以及
    计算单元，设置为根据各背光分区的平均驱动电压、基准背光亮度信号和基准驱动电压求取背光亮度调节信号，计算公式如下
    AM_P1*PM_ave1＝AM_P2*PM_ave2；
    2*AM_P*PM_ave＝AM_P1*PM_ave1+AM_P2*PM_ave2；
    P表示目标颜色子像素；M表示所述背光分区的序号；AM_P1表示设置为对下一幅画面的第一帧图像对应的背光分区M内的P子像素的背光源进行背光亮度调节的背光亮度调节信号；AM_P2表示设置为对下一幅画面的第二帧图像对应的所述背光分区M内的所述P子像素的背光源进行背光亮度调节的背光亮度调节信号；PM_ave1表示当前一幅画面的第一帧图像对应的所述背光分区M内的所述P子像素的驱动电压的平均值；PM_ave2当前一幅画面的第二帧图像对应的所述背光分区M内的所述P子像素的驱动电压的平均值；AM_P表示当前一幅画面的图像对应的所述背光分区M内的所述P子像素的基准背光亮度信号；PM_ave表示当前一幅画面的图像上与所述背光分区M对应的帧图形区域内的所述P子像素的基准驱动电压的平均值。
  18. 根据权利要求17所述的液晶显示装置，其中，所述计算机可执行指令被所述至少一个处理器执行时，还使得所述至少一个处理器在判断出所述平均色彩纯度在预设范围内时，执行计算所述背光分区对应的当前一幅画面区域的平均显示色相，并根据所述平均显示色相所属范围确定背光调节对象的步骤；所述背光调节对象包括红色子像素、绿色子像素和蓝色子像素中的至少一种子像素的背光源；
    所述背光调节部件还设置为根据与所述背光调节对象对应的背光调节信号对所述背光调节对象进行独立的亮度调节。
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