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WO2011058713A1 - Dispositif et procede d'affichage - Google Patents

Dispositif et procede d'affichage Download PDF

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Publication number
WO2011058713A1
WO2011058713A1 PCT/JP2010/006428 JP2010006428W WO2011058713A1 WO 2011058713 A1 WO2011058713 A1 WO 2011058713A1 JP 2010006428 W JP2010006428 W JP 2010006428W WO 2011058713 A1 WO2011058713 A1 WO 2011058713A1
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WIPO (PCT)
Prior art keywords
luminance value
divided
region
divided region
area
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
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PCT/JP2010/006428
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English (en)
Japanese (ja)
Inventor
敦士 中西
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Panasonic Corp
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Panasonic Corp
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Filing date
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Publication of WO2011058713A1 publication Critical patent/WO2011058713A1/fr
Anticipated expiration legal-status Critical
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
    • G09G3/3426—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines the different display panel areas being distributed in two dimensions, e.g. matrix
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/431—Generation of visual interfaces for content selection or interaction; Content or additional data rendering
    • H04N21/4318—Generation of visual interfaces for content selection or interaction; Content or additional data rendering by altering the content in the rendering process, e.g. blanking, blurring or masking an image region
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs
    • H04N21/44008—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs involving operations for analysing video streams, e.g. detecting features or characteristics in the video stream
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/57—Control of contrast or brightness
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133601—Illuminating devices for spatial active dimming
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133603—Direct backlight with LEDs
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G09G2320/0646—Modulation of illumination source brightness and image signal correlated to each other
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/16—Calculation or use of calculated indices related to luminance levels in display data

Definitions

  • the present invention relates to a display device and a display method using a backlight.
  • a liquid crystal display device using a liquid crystal display element (liquid crystal panel) as a light modulation element includes an illumination light source on the back surface, and displays an arbitrary image by controlling the transmittance of light emitted from the light source by the liquid crystal panel. Is realized.
  • the display screen is divided into a plurality of divided areas for the purpose of expanding the dynamic range of display luminance and reducing power consumption, and at least one light source is arranged for each area.
  • the display luminance in each divided area is detected and the emission luminance of each light source is divided in order to improve image quality while reducing power consumption.
  • the emission luminance of each light source is divided in order to improve image quality while reducing power consumption.
  • the display brightness range of the image display device is expanded to an ideal range, and a plurality of areas are supported for the purpose of ensuring image quality.
  • Luminance distribution calculating means for calculating the luminance distribution of the image signal and determining the brightness of the illumination light for each area, and illumination control for controlling the illumination light for each area of the illuminating means based on the determination of the luminance distribution calculating means
  • a configuration employing the means is known (for example, Patent Document 2).
  • the light emission luminance of each light source is calculated based on the display luminance detected including the influence on the region of other light sources that are not arranged corresponding to each divided region. Describes a configuration in which the amount of light from other light sources is calculated as constant.
  • Patent Document 2 describes a configuration for obtaining a luminance distribution between backlight regions using an approximate function.
  • the light emission luminance value from each light source is specified, and further, for each of the constituent areas constituting each divided area, the distance from each light source is considered, A configuration in which the luminance value of each component area is set is conceivable.
  • the horizontal axis indicates the distance between the divided regions, while the vertical axis indicates the light emission luminance of each light source.
  • the luminance value from the light source is set to 200
  • the luminance value from the light source is set to 80
  • the luminance value from the light source is set. It is assumed that 40 is set.
  • the luminance value of each component area can be set.
  • the horizontal axis indicates the distance of each divided region, while the vertical axis indicates the light emission luminance of each light source.
  • the luminance value from the light source is set to 200
  • the luminance value from the light source is set to 40
  • the luminance value from the light source is set. It is assumed that 80 is set.
  • these numbers are used for ease of explanation, and may actually be other values.
  • the constituent areas between the divided areas A and B are determined from the center of the divided area A and the central area of the divided area B in each constituent area. Accordingly, the luminance value of each component area is set linearly as shown in FIG. Will be.
  • the distance between the center of the divided area B and the central area of the divided area C and the luminance of the divided areas B and C in each constituent area Since the brightness value of each constituent area is set according to the value, the brightness of each constituent area is set linearly as shown in FIG.
  • the present invention is intended to provide a high-quality image regardless of the luminance value between a plurality of divided regions.
  • a display device is conceptually divided into a plurality of divided areas, includes a display panel that displays an input video signal, and first to third light sources, and each divided area of the display panel.
  • a plurality of light sources respectively illuminating from the back, a luminance value of the first divided region illuminated by the first light source based on the video signal, the second divided region adjacent to the first divided region, and the second The luminance value of the second divided area illuminated by the light source of the second and the third divided area illuminated by the third light source adjacent to the first divided area on the opposite side of the second divided area
  • calculating the luminance value of the first divided region calculated by the calculating unit to a luminance value for each of a plurality of constituent regions obtained by further dividing the first divided region.
  • a signal correction unit for determining a correction luminance value and the video A video correction unit that corrects the signal based on the corrected luminance value determined by the signal correction unit, the signal correction unit including the luminance value of the first divided region and the second and third divided regions
  • the display device is characterized in that the respective corrected luminance values are determined in accordance with the magnitude relationship with the respective luminance values.
  • a display method conceptually includes a display panel that is divided into a plurality of divided regions and displays an input video signal, and first to third light sources, and each of the divisions of the display panel.
  • a display method used for a display device including a plurality of light sources that respectively illuminate a region from the back, wherein the luminance value of the first divided region illuminated by the first light source based on the video signal; Adjacent to the first divided area, adjacent to the first divided area on the side opposite to the second divided area, the luminance value of the second divided area illuminated by the second light source, A calculation step of calculating a luminance value of the third divided region illuminated by the third light source; a luminance value of the first divided region calculated in the calculating step; and the first divided region further Luminance for each of the divided component areas
  • a signal correction step for determining the corrected luminance value corrected to the image correction step, and a video correction step for correcting the video signal based on the correction luminance value determined in the signal correction step.
  • the present invention has a plurality of configurations in which the first divided region is further divided according to the magnitude relationship between the luminance value of the first divided region and the luminance values of the second and third divided regions.
  • FIG. 1 is a diagram showing a configuration of a liquid crystal display device in Embodiment 1 of the present invention.
  • the figure which shows the processing content (keystone correction) of the liquid crystal display device of this invention The figure which shows the processing content (trapezoid and linear correction) of the liquid crystal display device of this invention.
  • the figure which shows the processing content (trapezoid and linear correction) of the liquid crystal display device of this invention The figure which shows the division area and structure area of this invention.
  • FIG. 1 is a block diagram showing the configuration of the liquid crystal display device according to the first embodiment of the present invention. 1 includes a calculation unit 102, a signal correction unit 104, a display panel driving unit 106, a display panel 108, a backlight driving unit 110, and a backlight unit 112. Hereinafter, each configuration will be described in detail.
  • the calculation unit 102 calculates a luminance value from the input video signal and outputs the calculated luminance value to the signal correction unit 104.
  • the calculation of the luminance value at this time is performed in units of divided areas obtained by dividing the display panel 108 described later into a plurality of areas.
  • the calculation unit 102 generates a luminance value from the input video signal based on the peak value and average value of the pixels in each divided region.
  • the signal correction unit 104 corrects the luminance value of each divided region unit calculated by the calculation unit 102 to a luminance value for each component region (described later) obtained by further dividing the divided region into a plurality of regions, and then a display panel described later.
  • the transmittance of the liquid crystal layer 108 is set. That is, the signal correction unit 104 obtains a corrected luminance value, notifies the obtained corrected luminance value to the video correcting unit 160, and the video correcting unit 160 sets the transmittance of the liquid crystal layer of the display panel 108.
  • the detailed configuration of the signal correction unit 104 will be described in detail with reference to FIG.
  • the display panel driving unit 106 and the display panel 108 will be described.
  • the display panel 108 includes a plurality of gate lines, a plurality of source lines, a switching element, and a plurality of pixel cells, and a plurality of pixels in a matrix at intersections of the plurality of source lines and the plurality of gate lines. Are arranged, and one scanning line is constituted by one line of pixels in the horizontal direction.
  • a plurality of source lines are supplied with pixel signals from the display panel driver 106, and a plurality of gate lines are supplied with gate pulses serving as scanning signals from the display panel driver 106, and a signal voltage is applied to the liquid crystal layer corresponding to each pixel. Is given to control the transmittance.
  • the display panel 108 is conceptually divided into a plurality of divided regions as indicated by dotted lines in FIG.
  • the display panel 108 may be any method such as a VA (Vertical Alignment) method or a UV2A (Ultraviolet induced multi-domain Vertical Alignment) method that irradiates liquid crystal molecules with ultraviolet rays. Is applicable.
  • VA Vertical Alignment
  • UV2A Ultraviolet induced multi-domain Vertical Alignment
  • the backlight unit 112 has a function of irradiating illumination light for displaying an image on the display panel 108 from the back side.
  • the backlight unit 112 is divided into a plurality of divided regions, like the display panel 108.
  • Each divided area illuminates a divided area at the same position on the display panel 108.
  • Each divided area has at least one light source.
  • the light source white LEDs or RGB LEDs that obtain white light using RGB three-color LEDs are used.
  • each divided area is driven by the backlight driving unit 110.
  • the luminance for each divided area is independently driven by the backlight driving unit 110 based on the luminance value calculated by the calculating unit 102.
  • each divided area is connected to the backlight drive unit 110 by a control line.
  • a configuration is adopted in which light emitted from the LEDs of the backlight unit 112 is made uniform by providing a diffusion sheet between the display panel 108 and the backlight unit 112. It is also possible to do.
  • the signal correction unit 104 is connected to the calculation unit 102 and the video correction unit 160, and includes a comparison unit 150, a straight line correction unit 152, a trapezoid correction unit 154, a selection unit 156, and a storage unit 158. It is comprised by.
  • the luminance value of each divided region is calculated by the calculation unit 102 described above, and the luminance value for each divided region is input.
  • the comparison unit 150 the luminance value of one divided area calculated by the calculating unit 102 and the luminance value of the divided areas around the divided area, that is, adjacent to the divided areas across the divided areas, respectively.
  • the luminance values of the two divided areas to be compared are compared.
  • the luminance value calculated by the calculating unit 102 is set such that the LED is in a non-luminous luminance state 0 and the maximum light emitting state is 255. In the present embodiment, for simplicity of explanation.
  • the luminance values emitted from the LEDs arranged in each divided area are shown, but the present invention is not limited to this, and for example, the luminance values emitted from the LEDs arranged in each divided area.
  • the A region includes A (1,1), A (1,2), A (1,3), A (2,1), A (2,2), A (2, 3)
  • the B region includes B (1, 1), B (1, 2), B (1, 3), B (2, 1), B (2, 2), B (2, 3).
  • B (3,1), B (3,2), and B (3,3) emit light from one LED
  • the C region includes C (1,1), C ( 1, 2), C (1, 3), C (2, 1), C (2, 2), C (2, 3), C (3, 1), C (3, 2), C (3 , 3) emits light from nine pixels.
  • the luminance value of the A region is 200
  • the luminance value of the B region is 40
  • the luminance value of the C region is 80.
  • the target area B has lower luminance than the luminance values of the adjacent areas A and C, that is, the adjacent areas A and C adjacent to the target divided area B, respectively.
  • only the horizontal direction is compared.
  • the present invention is not limited to this, and only the vertical direction, the vertical direction, and the horizontal direction are compared. It is also possible to employ a configuration that compares both regions.
  • the luminance value of the A region is 40
  • the luminance value of the B region is 200
  • the luminance value of the C region is 80.
  • the target area is B
  • the target area B has higher luminance than the luminance values of the peripheral areas A and C.
  • only the horizontal direction is compared.
  • the present invention is not limited to this, and only the vertical direction, the vertical direction, and the horizontal direction are compared. It is also possible to employ a configuration that compares both regions.
  • the A region includes A (1,1), A (1,2), A (1,3), A (2,1), A (2 , 2), A (2, 3), A (3, 1), A (3, 2), and A (3, 3), an example is shown in which one LED emits light.
  • the B region includes B (1, 1), B (1, 2), B (1, 3), B (2, 1), B (2, 2), B (2, 3).
  • B (3,1), B (3,2), and B (3,3) emit light from one LED
  • the C region includes C (1,1), C ( 1, 2), C (1, 3), C (2, 1), C (2, 2), C (2, 3), C (3, 1), C (3, 2), C (3 , 3) emits light from nine pixels.
  • each of the divided areas A, B, and C is further divided into nine parts and configured by nine constituent areas, and each constituent area is configured by one pixel. Has been.
  • the luminance value of the A region is 200
  • the luminance value of the B region is 80
  • the luminance value of the C region is 40.
  • the target area is B
  • the target area B has lower luminance than the peripheral area A, but higher luminance than the peripheral area C, and is an intermediate luminance value of the luminance values of the peripheral areas A and C. It has become.
  • only the horizontal direction is compared.
  • the present invention is not limited to this, and only the vertical direction, the vertical direction, and the horizontal direction are compared. It is also possible to employ a configuration that compares both regions.
  • the luminance value of the A region is 40
  • the luminance value of the B region is 80
  • the luminance value of the C region is 200.
  • the target area is B
  • the target area B has lower luminance than the peripheral area C, but higher luminance than the peripheral area A, and is an intermediate luminance value of the luminance values of the peripheral areas A and C. It has become.
  • only the horizontal direction is compared.
  • the present invention is not limited to this, and only the vertical direction, the vertical direction, and the horizontal direction are compared. It is also possible to employ a configuration that compares both regions.
  • the comparison unit 150 the luminance value of one divided area calculated by the calculation unit 102 and the luminance value of the divided areas around the divided area, that is, the divided areas are sandwiched between the divided areas. Compare each brightness value of two adjacent divided areas, and whether the brightness value of the target divided area is lower or higher (in the case of FIGS. 3 and 4) than the brightness value of the surrounding area Then, it is determined whether the luminance value of the target divided region is an intermediate luminance value (in the case of FIGS. 5 and 6) of the luminance values of the peripheral region.
  • FIG. 7 shows processing of the straight line correction unit 152 and the trapezoidal correction unit 154 for the cases of FIGS. 3 and 4 described above.
  • a solid line indicates the luminance value corrected by the trapezoid correction unit 154, while a dotted line indicates the luminance value corrected by the straight line correction unit 152.
  • FIG. 8 shows the processing of the straight line correction unit 152 and the trapezoidal correction unit 154 for the cases of FIGS. 5 and 6 described above.
  • a solid line indicates the luminance value corrected by the straight line correction unit 152, while a dotted line indicates the luminance value corrected by the trapezoid correction unit 154.
  • the trapezoid correcting unit 154 sets the target divided region B as the target divided region B.
  • luminance values of a predetermined constituent area that is, constituent areas in the vicinity of the center of the divided area B and peripheral areas along the horizontal direction (direction in which the divided areas are adjacent) of the constituent areas in the vicinity of the center.
  • the luminance value of the constituent area is a substantially constant value.
  • the straight line correction unit 152 sets the target divided region B as The luminance values of the plurality of constituent areas that constitute the luminance values are linearly distributed with the luminance values of the peripheral area A and the peripheral area C.
  • the trapezoidal correction unit 154 among the plurality of constituent areas constituting the target divided area B, the luminance value of a predetermined constituent area, that is, the constituent area in the vicinity of the center of the divided area B and the constituent area in the vicinity of the center.
  • the luminance value of the surrounding constituent areas along the horizontal direction is a substantially constant value, and the luminance of this part becomes a uniform luminance, so it becomes a flat image, There arises a problem that the quality of the image is lowered.
  • the comparison unit 150 causes either the straight line correction unit 152 or the trapezoid correction unit 154 to be selected depending on the relationship between the luminance value of the target divided region and the luminance value of the peripheral region. By selecting in the selection unit 156, an appropriate correction method can be selected.
  • the selection unit 156 selects the trapezoid correction unit 154 to select the target divided region B when the target divided region has lower or higher luminance than any luminance value of the surrounding region.
  • the luminance value of the component area becomes a substantially constant value. Therefore, it is possible to solve the problem that “a region (sharp break point) having a large change in luminance value distribution is generated in the central region of the divided region B, so that false contours are generated and image quality is lowered”. It becomes possible.
  • the selection unit 156 selects a plurality of lines that constitute the target divided region B by selecting the straight line correction unit 152.
  • the brightness value of the component area can be set to a brightness value that is linear with the brightness values of the peripheral area A and the peripheral area C, and an image without a sense of incongruity can be provided.
  • the straight line correction unit 152 and the trapezoid correction unit 154 are both horizontal in the plurality of constituent regions constituting the target divided region (the divided regions are adjacent to each other).
  • the luminance value of the component region near the center in the direction) is set to the luminance value of the divided region calculated by the calculation unit 102. That is, for example, in the upper diagram of FIG. 7, the trapezoid correcting unit 154 sets the luminance value of the component region near the center in the horizontal direction of the divided region B to the luminance value 40 of the divided region B calculated by the calculating unit 102. In the lower diagram of FIG. 7, the luminance value 200 is set. Further, for example, in the upper and lower diagrams of FIG. 8, the straight line correction unit 152 calculates the luminance value of the component region near the center in the horizontal direction of the divided region B, and the luminance value of the divided region B calculated by the calculating unit 102. 80 is set.
  • the component region in the vicinity of the center of the divided region in the horizontal direction refers to a component region including the center point in the horizontal direction of the divided region.
  • the center point in the horizontal direction of the divided area is located at the boundary between the two constituent areas, one of the two constituent areas may be a constituent area in the vicinity of the center in the horizontal direction of the divided area.
  • the video correction unit 160 corrects the video signal based on the luminance value corrected by either the straight line correction unit 152 or the trapezoidal correction unit 154 selected by the selection unit 156, and the corrected video is displayed.
  • the transmittance of the display panel 108 is set based on the signal.
  • the trapezoidal correction unit 154 performs processing other than the above-described method of setting the luminance value of the predetermined configuration region to a substantially constant value, as shown in FIG. 9, the gradient of the luminance value with respect to the input video signal. It can also be realized by changing.
  • an inclination correction unit 155 is provided in the trapezoid correction unit 154 and the angle of the luminance value calculated by the calculation unit 102 is corrected, so that the predetermined configuration area described above is corrected. It is possible to set the luminance value to be a substantially constant value.
  • FIGS. 9 and 10 a specific example of trapezoid correction by the inclination correction unit 155 will be described with reference to FIGS. 9 and 10.
  • FIG. 9 is a view for explaining generation of a correction line for trapezoid correction by the inclination correction unit 155
  • FIG. 10 is a view showing a correction line generated when trapezoid correction and straight line correction are continued.
  • the luminance values of the divided areas A, B, C, and D calculated by the calculation unit 102 are set as luminance values La, Lb, Lc, and Ld, respectively, and the magnitude relationship is La> Lb ⁇ Lc ⁇ .
  • Ld Ld.
  • the divided region B is the target region
  • Lb ⁇ Since Lc ⁇ Ld straight line correction is selected by the selection unit 156.
  • an intersection K1 between the line connecting the luminance values Lb and Lc and the boundary between the divided areas B and C is obtained.
  • a line M2 is generated in which the slope of the line M1 connecting the luminance values Lb and Lc is changed to a steep angle while passing through the intersection K1.
  • an intersection N1 between the line M2 and the luminance value Lb is obtained, and a horizontal line M3 passing through the intersection N1 is obtained.
  • an intersection K2 between a line connecting the luminance values La and Lb and the boundary between the divided areas A and B is obtained, and the luminance values La and Lb are connected while passing through the intersection K2.
  • a line M4 in which the slope of the line is changed to a steep angle is generated.
  • an intersection N2 between the line M4 and the horizontal line M3 is obtained.
  • the trapezoidal correction correction lines M2, M3, and M4 in the divided region B passing through the intersections K1 and N1, the luminance value Lb, and the intersections N2 and K2 are obtained.
  • the luminance value is a constant value Lb in the range of the correction line M3 as shown in FIG.
  • an intersection K3 between the line connecting the luminance values Lc and Ld and the boundary between the divided areas C and D is obtained.
  • a line M5 in the divided area C among the lines connecting the luminance values Lb and Lc and a line M6 in the divided area C among the lines connecting the luminance values Lc and Ld are obtained.
  • correction lines M5 and M6 for straight line correction in the divided area C passing through the intersection K1, the luminance value Lc, and the intersection K3 are obtained.
  • the luminance value of the target region is the target compared to the case where the luminance value of the target region is an intermediate luminance value of each luminance value of the peripheral region of the target region.
  • the amount of change in the luminance value of the target region is set gently.
  • the selection unit 156 selects linear correction. For example, straight line correction is selected in the divided area C of FIG.
  • the corrected luminance values of the plurality of constituent areas constituting the divided area C are the luminance values Lb and Lc of the constituent areas near the center of the divided areas B, C, and D.
  • Ld are interpolated luminance values obtained by linear interpolation.
  • the luminance value of the target divided region is adjacent to the target divided region as compared to the change in luminance value when linear correction is selected and the interpolated luminance value is obtained by linear interpolation.
  • the corrected luminance value is determined so that the change in the luminance value of each component area constituting the target divided area becomes gradual.
  • the keystone correction is selected by the selection unit 156.
  • correction lines M14 and M15 passing through the intersection point K2, the luminance value Lb, and the intersection point K1 are obtained as shown by dotted lines in FIG.
  • the change from the correction line M4 to the correction line M3 in the trapezoidal correction and the change in the luminance value from the correction line M3 to the correction line M2 are changed from the correction line M14 to the correction line M15 in the linear correction.
  • it is moderate.
  • the state in which the luminance value is decreased The luminance value changes more slowly than the linear correction that changes to an increasing state. That is, the straight line correction unit 152 is selected in the target region (when the luminance value of the target region is lower or higher than each luminance value in the adjacent region) for which the inclination correction unit 155 (trapezoid correction unit 154) is to be selected.
  • the change of the luminance value in the target region is gentle.
  • the size of the luminance value in the trapezoid correction that is, the length of the correction line M3 is substantially the same from left to right from the center of the divided region B, and the left and right inclination angles, that is, the correction line
  • the inclination angles of M4 and M2 have different values, but are not limited to this.
  • the left and right inclination angles, that is, the inclination angles of the correction lines M4 and M2 may be the same value
  • the luminance value may be the same value, that is, the length of the correction line M3 may be different from the center of the divided region B to the left and right. .
  • the length of the correction line M3 and the inclination angle of the correction lines M4 and M2 may be set according to the characteristics of the display panel 108 and the backlight unit 112, for example, and these set values are stored in the storage unit 158 (FIG. 2). You just have to.
  • FIG. 11 is a diagram illustrating a correction line generated when trapezoidal correction is selected in both adjacent divided areas
  • FIG. 12 is a correction generated when trapezoidal correction and straight line correction are selected in adjacent divided areas. It is a figure which shows a line.
  • the connection procedure of the correction lines is changed. 11 and 12, the same elements as those in FIGS. 9 and 10 are denoted by the same reference numerals.
  • the magnitude relation between the luminance values La, Lb, Lc, and Ld of the divided areas A, B, C, and D calculated by the calculation unit 102 is La> Lb ⁇ Lc> Ld.
  • the magnitude relationship between the luminance values La, Lb, Lc, and Ld of the divided areas A, B, C, and D calculated by the calculating unit 102 is La> Lb ⁇ Lc ⁇ Ld.
  • the intersection K1 connecting the correction lines M2 and M5 is shifted downward to be the intersection K10, and accordingly, the inclinations of the correction lines M2 and M5 are also changed to generate the correction lines M20 and M50.
  • the amount by which the intersection point K1 is shifted downward is 1 ⁇ 2 of the difference between the luminance value of the intersection point K1 and the luminance value Lb in FIG. 12, but is not limited thereto.
  • the shift amount may be set according to the characteristics of the display panel 108 and the backlight unit 112. This shift amount may be stored in the storage unit 158 (FIG. 2) in the signal correction unit 104.
  • the line connecting the luminance values Lb and Lc and the boundary between the divided regions B and C are displayed.
  • the correction lines M20 and M50 are generated by changing the inclination so as to pass through the intersection K10 shifted downward without passing through the intersection K1. Accordingly, the case shown in FIG. 12 where the horizontal correction line M3 moves to the correction line M20 from the horizontal correction line M3 to the correction line M20 is compared with the case shown in FIG. 12 where the horizontal correction line M3 moves to the correction line M20 at the intersection N1.
  • the change in the luminance value at N1 can be further moderated.
  • the magnitude relationship between the luminance values La, Lb, and Lc of the divided areas A, B, and C is La> Lb ⁇ Lc
  • the trapezoidal correction correction line in the divided area B has a downwardly convex shape. Therefore, the intersection point K1 is shifted downward to be the intersection point K10.
  • the magnitude relationship between the luminance values La, Lb, and Lc of the divided areas A, B, and C is La ⁇ Lb> Lc
  • the correction line for trapezoid correction in the divided area B is convex upward. If it has, the intersection K1 should just be shifted upward.
  • shifting the intersection point K1 downward to the intersection point K10 and replacing the correction line M2 with the correction line M20 means the following. That is, among the constituent areas of the divided area B, the corrected luminance value of the constituent area in the vicinity of the boundary between the divided areas B and C is a displacement luminance value shifted downward from the average value of the luminance value Lb and the luminance value Lc. This means that the corrected luminance value from the component region near the boundary to the component region located at the intersection N1 is a luminance value corresponding to the correction line M20 obtained by linearly interpolating the displacement luminance value and the luminance value Lb.
  • shifting the intersection point K1 downward to the intersection point K10 and replacing the correction line M5 with the correction line M50 means the following. That is, among the constituent areas of the divided area C, the corrected luminance value of the constituent area in the vicinity of the boundary between the divided areas B and C is a displacement luminance value shifted downward from the average value of the luminance value Lb and the luminance value Lc. This means that the corrected luminance value from the component region near the boundary to the component region near the center of the divided region C is set to a luminance value corresponding to the correction line M50 obtained by linearly interpolating the displacement luminance value and the luminance value Lc.
  • the constituent area in the vicinity of the boundary between the divided areas B and C is a constituent area adjacent to the boundary between the divided areas B and C.
  • each of the divided areas A, B, and C is further divided into nine parts and configured by nine constituent areas, and each constituent area is configured by one pixel.
  • each constituent area may be composed of a plurality of pixels.
  • the configuration areas a, b, c, d, f, g, h, and i are all in contact with the other divided areas, and are not in contact with the other divided areas. The effect of light from other divided areas is different.
  • the luminance value set for each divided region by correcting the luminance value set for each divided region according to the position of each pixel from the center of the plurality of divided regions, It is possible to set a luminance value according to the position of the constituent area constituting the divided area.
  • the luminance value of each component area is changed according to the luminance distribution from the light source arranged in the target divided area and the luminance distribution from the light source arranged in the peripheral area around the target divided area. It is possible to do that.
  • the interpolation unit 202 inputs the luminance values L1 and L2 of the light sources of the divided areas 1 and 2 and x that is the horizontal coordinate value in FIG.
  • the luminance value at the point Q1 is interpolated.
  • the interpolation unit 204 the luminance values L3 and L4 of the light sources in the divided areas 3 and 4 and x which is the coordinate value in the horizontal direction are input, and the luminance value at the point Q2 in FIG. 14 is interpolated.
  • the interpolation unit 206 the luminance value at the point Q1, the luminance value at the point Q2, and y which is a coordinate value in the vertical direction are input, and the luminance value Lp1 of the estimation target pixel P1 (x, y) in FIG. 14 is interpolated. .
  • each component area is determined according to the luminance distribution from the light source arranged in the target divided area and the luminance distribution from the light source arranged in the divided area around the target divided area.
  • the present invention is not limited to this.
  • the luminance value of each component area of the divided area may be further corrected according to only the luminance distribution from the light source arranged in the target divided area.
  • the second embodiment which also considers the luminance distribution from the light sources arranged in the peripheral divided regions, is preferable because high image quality can be obtained.
  • the vertical configuration areas that is, the configuration areas a, d, and g, the configuration areas b, e, and h, and the configuration areas c, f, and i in FIG. It explained on the assumption. That is, in the first embodiment, only the influence of the peripheral divided areas adjacent in the horizontal direction is considered. On the other hand, in the third embodiment, the influence of peripheral divided areas adjacent in the vertical direction is also taken into consideration.
  • the divided areas 1 to 3, the divided areas 4 to 6, and the divided areas 7 to 9 are adjacent to each other in the horizontal direction in order from the left.
  • the divided areas 2, 5, 8 and the divided areas 3, 6, 9 are adjacent to each other in the vertical direction from the top, and the divided area 5 is the target area.
  • the same components as those in the first embodiment are denoted by the same reference numerals.
  • signal correction units 212, 214, 216, and 218 are provided.
  • the signal correction unit 212 receives the luminance values L1, L2, and L3 of the light sources in the divided regions 1, 2, and 3 calculated by the calculation unit 102 and x that is the horizontal coordinate value. Then, the signal correction unit 212 selects trapezoidal correction or straight line correction according to the magnitude relationship between the luminance values L1, L2, and L3, and obtains the luminance value Lq1 at the point Q11 in FIG.
  • the luminance values L4, L5, and L6 of the light sources in the divided areas 4, 5, and 6 calculated by the calculation unit 102 and x that is the horizontal coordinate value are input to the signal correction unit 214. Then, the signal correction unit 214 selects trapezoidal correction or straight line correction according to the magnitude relationship between the luminance values L4, L5, and L6, and obtains the luminance value Lq2 at the point Q12 in FIG.
  • the luminance values L7, L8, and L9 of the light sources in the divided areas 7, 8, and 9 calculated by the calculation unit 102 and x that is the coordinate value in the horizontal direction are input to the signal correction unit 216.
  • the signal correction unit 216 selects trapezoidal correction or straight line correction according to the magnitude relationship between the luminance values L7, L8, and L9, and obtains the luminance value Lq3 at the point Q13 in FIG.
  • the luminance value Lq1 at the point Q11, the luminance value Lq2 at the point Q12, the luminance value Lq3 at the point Q13, and y that is the coordinate value in the vertical direction are input to the signal correction unit 218.
  • the signal correction unit 218 selects trapezoidal correction or linear correction according to the magnitude relationship between the luminance values Lq1, Lq2, and Lq3, and the luminance value of the estimation target pixel P2 (x, y) at the point P2 in FIG. Lp2 is obtained.
  • the backlight unit 112 adopts a direct type is described, but the present invention is not limited to this, and an edge light method may be adopted.
  • a backlight unit of an edge light system a plurality of LEDs are disposed along one end face of the display panel along the end face, and the other end side opposite to the one end side of the display panel is provided along the end face.
  • positioned several LED is employable.
  • a display device is conceptually divided into a plurality of divided regions, includes a display panel that displays an input video signal, and first to third light sources, and each of the display panels.
  • a plurality of light sources that illuminate each of the divided areas from the back, a luminance value of the first divided area illuminated by the first light source based on the video signal, and adjacent to the first divided area, The luminance value of the second divided region illuminated by the second light source, and the third illumination illuminated by the third light source adjacent to the first divided region on the side opposite to the second divided region
  • a signal correction unit for determining a corrected luminance value and A video correction unit that corrects the video signal based on the corrected luminance value determined by the signal correction unit, the signal correction unit including the luminance value of the first divided region and the second and third luminance values.
  • the corrected luminance values are determined according to the magnitude relationship with the luminance values of the divided areas.
  • the luminance value of the first divided region illuminated by the first light source and the luminance value of the second divided region adjacent to the first divided region and illuminated by the second light source is calculated by the calculation unit based on the input video signal. Calculated. Then, the calculated luminance value of the first divided region is obtained by further calculating the first region according to the magnitude relationship between the luminance value of the first divided region and the luminance values of the second and third divided regions.
  • the signal correction unit corrects the luminance value for each of the plurality of divided configuration areas to determine each corrected luminance value.
  • the third divided region is adjacent to the first divided region on the side opposite to the second divided region, which means that the first divided region is sandwiched between the second and third divided regions. Will be.
  • the first divided region according to the magnitude relationship between the luminance value of the first divided region and the luminance values of the second and third divided regions sandwiching the first divided region.
  • the correction luminance value for each of the plurality of constituent areas obtained by further dividing the above is determined by the signal correction unit. Therefore, it is possible to suitably determine the corrected luminance value of each component area constituting the first divided area.
  • the signal correction unit calculates a corrected luminance value of a constituent region near the center of the first divided region in a direction adjacent to the first to third divided regions by the calculating unit.
  • a luminance value of the first divided region is determined, and a corrected luminance value of a component region near the center in the adjacent direction among a plurality of component regions obtained by further dividing the second divided region is calculated by the calculation unit.
  • the luminance value of the second divided region is determined, and the corrected luminance value of the component region near the center in the adjacent direction among the plurality of component regions obtained by further dividing the third divided region is calculated by the calculation unit. It is preferable to determine the luminance value of the third divided area.
  • the corrected luminance value of the component region near the center of the first divided region in the adjacent direction of the first to third divided regions is the luminance value of the first divided region calculated by the calculation unit.
  • the corrected luminance value of the component region near the center in the adjacent direction among the plurality of component regions obtained by further dividing the second divided region is determined as the luminance value of the second divided region calculated by the calculation unit,
  • the corrected luminance value of the component region near the center in the adjacent direction among the plurality of component regions obtained by further dividing the third divided region is determined as the luminance value of the third divided region calculated by the calculation unit.
  • the corrected luminance value for each of the plurality of component areas constituting the first divided area is determined according to the magnitude relationship between the luminance value of the first divided area and the luminance values of the second and third divided areas. Since it is determined by the signal correction unit, the correction luminance value of each constituent region other than the constituent region near the center of the first divided region can be suitably determined by the signal correction unit.
  • the signal correction unit may be configured such that the luminance value of the first divided region is lower or higher than the luminance value of any of the second and third divided regions.
  • the corrected luminance value of the peripheral constituent area along the adjacent direction of the constituent area in the vicinity of the center in the adjacent direction of the first divided area It is preferable that the luminance value of the first divided region calculated by the calculating unit is substantially the same value.
  • the corrected luminance value of the peripheral constituent region along the adjacent direction of the constituent region near the center in the adjacent direction of the first divided region is the luminance value of the first divided region calculated by the calculating unit Is set to approximately the same value.
  • the luminance value of the first divided area sandwiched between the second and third divided areas is lower or higher than the luminance value of any of the second and third divided areas.
  • the signal correcting unit calculates the corrected luminance value of the peripheral constituent region along the adjacent direction of the constituent region near the center in the adjacent direction of the first divided region by the calculating unit. It is set to a value substantially the same as the luminance value of one divided area. Therefore, when the luminance value is reduced from rising to rising or from rising to lowering, the luminance value once becomes a substantially constant value, so that the change in the luminance value becomes gradual. Therefore, no false contour is generated in the video, and it is possible to prevent the video quality from being deteriorated.
  • the signal correction unit may be configured such that the luminance value of the first divided region is an intermediate luminance value between the luminance value of the second divided region and the luminance value of the third divided region.
  • the correction brightness value of each of the plurality of constituent areas constituting the first divided area is set to a value between the brightness value of the second divided area and the brightness value of the third divided area. preferable.
  • each corrected luminance value of the plurality of component regions is a value between the luminance value of the second divided region and the luminance value of the third divided region.
  • the luminance value of the first divided region sandwiched between the second and third divided regions is an intermediate luminance value between the luminance value of the second divided region and the luminance value of the third divided region.
  • the luminance value decreases or increases when moving from the second divided region to the first divided region, and the luminance value further decreases or increases when moving from the first divided region to the third divided region. means.
  • each corrected luminance value of the plurality of component areas constituting the first divided area is a value between the luminance values of the second and third divided areas.
  • the signal correction unit corrects the corrected luminance values of a plurality of constituent areas constituting the first divided area in the vicinity of the center in the adjacent direction of the second divided area.
  • Linear interpolation of the luminance value, the corrected luminance value of the component region near the center in the adjacent direction of the first divided region, and the corrected luminance value of the component region near the center in the adjacent direction of the third divided region The luminance value of the first divided region is lower or higher than the luminance value of the second and third divided regions, compared to the change of the luminance value when the interpolated luminance value is set.
  • the luminance value of the first divided region sandwiched between the second and third divided regions is lower or higher than the luminance value of any of the second and third divided regions.
  • the luminance value decreases or increases when moving from the second divided region to the first divided region, and the luminance value increases or decreases conversely when moving from the first divided region to the third divided region.
  • the corrected brightness values of the plurality of constituent areas constituting the first divided area are the same as the corrected brightness values of the constituent areas near the center in the adjacent direction of the second divided area and the adjacent directions of the first divided area.
  • the corrected luminance value of the component region near the center and the corrected luminance value of the component region near the center in the adjacent direction of the third divided region are interpolated luminance values obtained by linear interpolation, the luminance value increases from a decrease or It changes abruptly from rising to lowering, and there is a possibility that a false contour is generated in the video.
  • the luminance values of the plurality of component areas constituting the first divided area in the adjacent direction Since the correction luminance value is determined by the inclination correction unit so that the change of the image becomes gradual, a false contour is not generated in the video, and the video quality can be prevented from deteriorating.
  • the plurality of light sources may further include a fourth light source
  • the calculation unit may calculate a luminance value of a fourth divided region illuminated by the fourth light source based on the video signal.
  • the fourth divided region is adjacent to the third divided region on the opposite side of the first divided region in the adjacent direction, and the signal correction unit is calculated by the calculating unit.
  • the third divided region is further divided according to the magnitude relationship between the luminance value of the third divided region and the luminance value of the first and fourth divided regions.
  • the corrected luminance value corrected to the luminance value for each of the plurality of component regions is determined, and the signal correction unit further determines whether the luminance value of the first divided region is any of the luminance values of the second and third divided regions.
  • the luminance value of the three divided areas is a luminance value between the luminance value of the first divided area and the luminance value of the fourth divided area
  • the first and The corrected luminance value of the constituent area near the boundary of the third divided area and the corrected luminance value of the constituent area of the third divided area near the boundary of the first and third divided areas are respectively It is preferable to determine a displacement luminance value that is lowered or increased from an average value of the luminance value of one divided region and the luminance value of the third divided region.
  • the fourth divided region is adjacent to the third divided region on the opposite side in the adjacent direction to the first divided region. That is, each divided region is adjacent in the adjacent direction, for example, in the order of the second, first, third, and fourth divided regions.
  • the case where the luminance value of the first divided region is lower or higher than the luminance value of any of the second and third divided regions is, for example, from the second divided region to the first It means that the luminance value decreases or increases when moving to the divided area, and the luminance value increases or decreases conversely when moving from the first divided area to the third divided area.
  • the luminance value of the third divided region is an intermediate luminance value between the luminance value of the first divided region and the luminance value of the fourth divided region, for example, the first divided region to the third divided region It means that the luminance value decreases or increases when moving to, and the luminance value further decreases or increases when moving from the third divided region to the fourth divided region.
  • the luminance value decreases when the second divided area moves to the first divided area, and the first When it moves from the divided area to the third divided area, it rises conversely, and when it moves from the third divided area to the fourth divided area, it rises further, or it moves from the second divided area to the first divided area.
  • the first divided region to the third divided region it decreases, and when it moves from the third divided region to the fourth divided region, it further decreases.
  • the luminance value decreases when moving from the second divided area to the first divided area, and increases when moving from the first divided area to the third divided area, and from the third divided area to the fourth divided area.
  • the corrected luminance value of the component region in the vicinity of the boundary between the first and third divided regions, the first and third divided regions, The corrected luminance value of the component region in the vicinity of the boundary of the third divided region is determined as a displacement luminance value reduced from the average value of the luminance value of the first divided region and the luminance value of the third divided region.
  • the luminance value increases when moving from the second divided region to the first divided region, and conversely decreases when moving from the first divided region to the third divided region, and from the third divided region to the fourth divided region.
  • the corrected luminance value of the component region in the vicinity of the boundary between the first and third divided regions, the first and third divided regions, The corrected luminance value of the component region in the vicinity of the boundary of the third divided region is determined as a displacement luminance value increased from the average value of the luminance value of the first divided region and the luminance value of the third divided region.
  • the first divided region is changed from the component region near the center.
  • the displacement luminance value is reduced compared to the average value. That is, the amount of change in the corrected luminance value in the first divided region after the luminance value is inverted in the component region near the center of the first divided region is shifted from the second divided region to the first divided region.
  • the change in the corrected luminance value can be made more gradual. Therefore, it is possible to further suppress the occurrence of false contours and prevent the video quality from deteriorating.
  • the signal correction unit further sets the correction luminance value for each of the plurality of constituent areas constituting the first divided area according to the luminance distribution of the illumination light of the first light source. It is preferable to correct. According to this configuration, since each corrected luminance value for each of the plurality of component areas constituting the first divided area is further corrected according to the luminance distribution of the illumination light of the first light source, the first divided area It is possible to more suitably determine the corrected luminance values of the plurality of constituent areas constituting the.
  • the signal correction unit may convert the corrected luminance values for each of the plurality of constituent areas constituting the first divided area into luminance distributions of illumination light of the first to third light sources. It is preferable to further correct accordingly. According to this configuration, each corrected luminance value for each of the plurality of component areas constituting the first divided area is further corrected according to the luminance distribution of the illumination light of the first to third light sources. The corrected luminance value of each component area of the divided areas can be determined more suitably.
  • the plurality of constituent regions constituting the first divided region are configured by a plurality of pixels or a single pixel. According to this configuration, since the plurality of configuration areas constituting the first divided area are configured by a plurality or a single pixel, the correction luminance value can be set finely for each of the plurality of pixels or a single pixel. Can do.
  • a display method conceptually includes a display panel that is divided into a plurality of divided regions and displays an input video signal, and first to third light sources, and each of the divisions of the display panel.
  • a display method used for a display device including a plurality of light sources that respectively illuminate a region from the back, wherein the luminance value of the first divided region illuminated by the first light source based on the video signal; Adjacent to the first divided area, adjacent to the first divided area on the side opposite to the second divided area, the luminance value of the second divided area illuminated by the second light source, A calculation step of calculating a luminance value of the third divided region illuminated by the third light source; a luminance value of the first divided region calculated in the calculating step; and the first divided region further Luminance for each of the divided component areas
  • a signal correction step for determining the corrected luminance value corrected to the image correction step, and a video correction step for correcting the video signal based on the correction luminance value determined in the signal correction step.
  • the luminance value of the first divided region illuminated by the first light source and the luminance value of the second divided region adjacent to the first divided region and illuminated by the second light source is calculated based on the input video signal. Calculated. Then, the calculated luminance value of the first divided region is obtained by further calculating the first region according to the magnitude relationship between the luminance value of the first divided region and the luminance values of the second and third divided regions. The luminance value for each of the plurality of divided configuration areas is corrected in the signal correction step, and each corrected luminance value is determined.
  • the third divided region is adjacent to the first divided region on the side opposite to the second divided region, which means that the first divided region is sandwiched between the second and third divided regions.
  • the first divided region according to the magnitude relationship between the luminance value of the first divided region and the luminance values of the second and third divided regions sandwiching the first divided region.
  • the corrected luminance value for each of the plurality of constituent regions obtained by further dividing the above is determined. Therefore, it is possible to suitably determine the corrected luminance value of each component area constituting the first divided area.
  • a corrected luminance value of a component region near the center of the first divided region in the adjacent direction of the first to third divided regions is calculated in the calculating step.
  • the luminance value of the first divided region is determined, and the corrected luminance value of the component region near the center in the adjacent direction among the plurality of component regions obtained by further dividing the second divided region is calculated in the calculating step.
  • the brightness value of the second divided area is determined, and the corrected brightness value of the constituent area near the center in the adjacent direction among the plurality of constituent areas obtained by further dividing the third divided area is calculated in the calculating step. It is preferable to determine the luminance value of the third divided area.
  • the corrected luminance value of the component region near the center of the first divided region in the adjacent direction of the first to third divided regions is the luminance value of the first divided region calculated in the calculating step.
  • the corrected luminance value of the component region near the center in the adjacent direction among the plurality of component regions obtained by further dividing the second divided region is determined as the luminance value of the second divided region calculated in the calculation step
  • the corrected luminance value of the component region near the center in the adjacent direction among the plurality of component regions obtained by further dividing the third divided region is determined as the luminance value of the third divided region calculated in the calculation step.
  • the corrected luminance value for each of the plurality of component areas constituting the first divided area is determined according to the magnitude relationship between the luminance value of the first divided area and the luminance values of the second and third divided areas. Since it is determined in the signal correction step, the corrected luminance value of each constituent region other than the constituent region near the center of the first divided region can be suitably determined in the signal correction step.
  • the signal correction step when the luminance value of the first divided region is lower or higher than the luminance value of any of the second and third divided regions, Among the plurality of constituent areas constituting the first divided area, the corrected luminance value of the peripheral constituent area along the adjacent direction of the constituent area in the vicinity of the center in the adjacent direction of the first divided area, It is preferable that the luminance value of the first divided region calculated in the calculating step is substantially the same value.
  • the corrected luminance value of the peripheral constituent region along the adjacent direction of the constituent region near the center in the adjacent direction of the first divided region is the luminance value of the first divided region calculated in the calculating step Is set to approximately the same value.
  • the luminance value of the first divided area sandwiched between the second and third divided areas is lower or higher than the luminance value of any of the second and third divided areas.
  • the corrected luminance value of the peripheral constituent region along the adjacent direction of the constituent region near the center in the adjacent direction of the first divided region is calculated in the calculating step. It is set to a value substantially the same as the luminance value of one divided area. Therefore, when the luminance value is reduced from rising to rising or from rising to lowering, the luminance value once becomes a substantially constant value, so that the change in the luminance value becomes gradual. Therefore, no false contour is generated in the video, and it is possible to prevent the video quality from being deteriorated.
  • the luminance value of the first divided region is an intermediate luminance value between the luminance value of the second divided region and the luminance value of the third divided region.
  • the correction brightness value of each of the plurality of constituent areas constituting the first divided area is set to a value between the brightness value of the second divided area and the brightness value of the third divided area. preferable.
  • each corrected luminance value of the plurality of component regions is a value between the luminance value of the second divided region and the luminance value of the third divided region.
  • the luminance value of the first divided region sandwiched between the second and third divided regions is an intermediate luminance value between the luminance value of the second divided region and the luminance value of the third divided region.
  • the luminance value decreases or increases when moving from the second divided region to the first divided region, and the luminance value further decreases or increases when moving from the first divided region to the third divided region. means.
  • each corrected luminance value of the plurality of component areas constituting the first divided area is a value between the luminance values of the second and third divided areas.
  • the signal correction step includes correcting the corrected luminance values of the plurality of constituent areas constituting the first divided area and correcting the constituent areas near the center in the adjacent direction of the second divided area.
  • Linear interpolation of the luminance value, the corrected luminance value of the component region near the center in the adjacent direction of the first divided region, and the corrected luminance value of the component region near the center in the adjacent direction of the third divided region The luminance value of the first divided region is lower or higher than the luminance value of the second and third divided regions, compared to the change of the luminance value when the interpolated luminance value is set.
  • a slope correction step of determining the correction luminance value so that the change in the luminance value of the plurality of component areas constituting the first divided area in the adjacent direction becomes gentle.
  • the luminance value of the first divided region sandwiched between the second and third divided regions is lower or higher than the luminance value of any of the second and third divided regions.
  • the luminance value decreases or increases when moving from the second divided region to the first divided region, and the luminance value increases or decreases conversely when moving from the first divided region to the third divided region.
  • the corrected brightness values of the plurality of constituent areas constituting the first divided area are the same as the corrected brightness values of the constituent areas near the center in the adjacent direction of the second divided area and the adjacent directions of the first divided area.
  • the corrected luminance value of the component region near the center and the corrected luminance value of the component region near the center in the adjacent direction of the third divided region are interpolated luminance values obtained by linear interpolation, the luminance value increases from a decrease or It changes abruptly from rising to lowering, and there is a possibility that a false contour is generated in the video.
  • the luminance values of the plurality of component areas constituting the first divided area in the adjacent direction Since the correction luminance value is determined in the inclination correction step so that the change of the image becomes gradual, no false contour is generated in the video image, and the video quality can be prevented from deteriorating.
  • the calculation step illumination is performed by a fourth light source included in the plurality of light sources based on the video signal, and the first divided region is opposite to the first divided region in the adjacent direction.
  • the luminance value of the fourth divided region adjacent to the three divided regions is calculated, and in the signal correction step, the luminance value of the third divided region calculated in the calculating step is calculated using the luminance value of the third divided region.
  • a corrected luminance value corrected to the luminance value for each of a plurality of constituent areas obtained by further dividing the third divided area is determined.
  • the luminance value of the first divided region is lower or higher than the luminance value of any of the second and third divided regions, and Brightness of the third divided area
  • the value is a luminance value between the luminance value of the first divided area and the luminance value of the fourth divided area
  • the first divided area and the third divided area of the first divided area are respectively the luminances of the first divided region. It is preferable to determine a displacement luminance value that is lowered or increased from an average value of the value and the luminance value of the third divided region.
  • the fourth divided region is adjacent to the third divided region on the opposite side in the adjacent direction to the first divided region. That is, each divided region is adjacent in the adjacent direction, for example, in the order of the second, first, third, and fourth divided regions.
  • the case where the luminance value of the first divided region is lower or higher than the luminance value of any of the second and third divided regions is, for example, from the second divided region to the first It means that the luminance value decreases or increases when moving to the divided area, and the luminance value increases or decreases conversely when moving from the first divided area to the third divided area.
  • the luminance value of the third divided region is an intermediate luminance value between the luminance value of the first divided region and the luminance value of the fourth divided region, for example, the first divided region to the third divided region It means that the luminance value decreases or increases when moving to, and the luminance value further decreases or increases when moving from the third divided region to the fourth divided region.
  • the luminance value decreases when the second divided area moves to the first divided area, and the first When it moves from the divided area to the third divided area, it rises conversely, and when it moves from the third divided area to the fourth divided area, it rises further, or it moves from the second divided area to the first divided area.
  • the first divided region to the third divided region it decreases, and when it moves from the third divided region to the fourth divided region, it further decreases.
  • the luminance value decreases when moving from the second divided area to the first divided area, and increases when moving from the first divided area to the third divided area, and from the third divided area to the fourth divided area.
  • the corrected luminance value of the component region in the vicinity of the boundary between the first and third divided regions, the first and third divided regions, The corrected luminance value of the component region in the vicinity of the boundary of the third divided region is determined as a displacement luminance value reduced from the average value of the luminance value of the first divided region and the luminance value of the third divided region.
  • the luminance value increases when moving from the second divided region to the first divided region, and conversely decreases when moving from the first divided region to the third divided region, and from the third divided region to the fourth divided region.
  • the corrected luminance value of the component region in the vicinity of the boundary between the first and third divided regions, the first and third divided regions, The corrected luminance value of the component region in the vicinity of the boundary of the third divided region is determined as a displacement luminance value increased from the average value of the luminance value of the first divided region and the luminance value of the third divided region.
  • the first divided region is changed from the component region near the center.
  • the displacement luminance value is reduced compared to the average value. That is, the amount of change in the corrected luminance value in the first divided region after the luminance value is inverted in the component region near the center of the first divided region is shifted from the second divided region to the first divided region.
  • the change in the corrected luminance value can be made more gradual. Therefore, it is possible to further suppress the occurrence of false contours and prevent the video quality from deteriorating.
  • the corrected luminance values for each of the plurality of constituent areas constituting the first divided area are further set in accordance with a luminance distribution of illumination light of the first light source. It is preferable to correct. According to this configuration, since each corrected luminance value for each of the plurality of component areas constituting the first divided area is further corrected according to the luminance distribution of the illumination light of the first light source, the first divided area It is possible to more suitably determine the corrected luminance values of the plurality of constituent areas constituting the.
  • the corrected luminance values for each of the plurality of constituent areas constituting the first divided area are converted into luminance distributions of illumination light of the first to third light sources. It is preferable to further correct accordingly. According to this configuration, each corrected luminance value for each of the plurality of component areas constituting the first divided area is further corrected according to the luminance distribution of the illumination light of the first to third light sources.
  • the corrected luminance value of each component area of the divided areas can be determined more suitably.
  • the plurality of constituent regions constituting the first divided region are configured by a plurality or a single pixel. According to this configuration, since the plurality of configuration areas constituting the first divided area are configured by a plurality or a single pixel, the correction luminance value can be set finely for each of the plurality of pixels or a single pixel. Can do.
  • a display device including a display panel that displays an input video signal and a plurality of light sources that irradiate the display panel from the back, it is useful as a display device and a display method that can display high-quality video.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Liquid Crystal (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Transforming Electric Information Into Light Information (AREA)

Abstract

L'invention concerne une unité de calcul qui calcule, sur la base d'un signal d'image, la valeur de luminance d'une première région divisée qui est éclairée par une première source lumineuse, la valeur de luminance d'une deuxième région divisée contiguë à la première région divisée et éclairée par une deuxième source lumineuse, et la valeur de luminance d'une troisième région divisée contiguë à la première région divisée sur le côté opposé de la deuxième région divisée et éclairée par une troisième source lumineuse; une unité de correction de signal (104) qui détermine une valeur de luminance corrigée, la valeur de luminance de la première région divisée ayant été corrigée dans la valeur de luminance de chacune d'une pluralité de régions de formation dans lesquelles la première région divisée a été encore divisée; et une unité de correction d'image (160) qui corrige le signal d'image sur la base de la valeur de luminance corrigée qui a été déterminée par l'unité de correction de signal (104). Ladite unité de correction de signal (104) détermine les valeurs de luminance corrigées en fonction de la relation d'amplitude entre la valeur de luminance de la première région divisée et les valeurs de luminance de la deuxième et de la troisième région divisée.
PCT/JP2010/006428 2009-11-13 2010-11-01 Dispositif et procede d'affichage Ceased WO2011058713A1 (fr)

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WO2012114682A1 (fr) * 2011-02-23 2012-08-30 パナソニック株式会社 Dispositif d'affichage et procédé d'affichage
CN119052363A (zh) * 2024-08-28 2024-11-29 深圳市新龙鹏科技有限公司 一种手机副屏补光控制方法、装置、设备及存储介质

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US10783839B2 (en) * 2015-06-01 2020-09-22 Tianman Microelectronics Co., Ltd. Display device with memory function, terminal device, and driving method thereof

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JP2002099250A (ja) * 2000-09-21 2002-04-05 Toshiba Corp 表示装置
WO2008126904A1 (fr) * 2007-04-11 2008-10-23 Taiyo Yuden Co., Ltd. Dispositif d'affichage vidéo

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JP2002099250A (ja) * 2000-09-21 2002-04-05 Toshiba Corp 表示装置
WO2008126904A1 (fr) * 2007-04-11 2008-10-23 Taiyo Yuden Co., Ltd. Dispositif d'affichage vidéo

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012114682A1 (fr) * 2011-02-23 2012-08-30 パナソニック株式会社 Dispositif d'affichage et procédé d'affichage
US9305495B2 (en) 2011-02-23 2016-04-05 Panasonic Intellectual Property Management Co., Ltd. Display device and display method for estimating backlight luminance distribution
CN119052363A (zh) * 2024-08-28 2024-11-29 深圳市新龙鹏科技有限公司 一种手机副屏补光控制方法、装置、设备及存储介质

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