WO2019064798A1 - Dispositif d'affichage - Google Patents

Dispositif d'affichage Download PDF

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Publication number
WO2019064798A1
WO2019064798A1 PCT/JP2018/025509 JP2018025509W WO2019064798A1 WO 2019064798 A1 WO2019064798 A1 WO 2019064798A1 JP 2018025509 W JP2018025509 W JP 2018025509W WO 2019064798 A1 WO2019064798 A1 WO 2019064798A1
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WIPO (PCT)
Prior art keywords
area
emission intensity
backlight
control
light emission
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PCT/JP2018/025509
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English (en)
Japanese (ja)
Inventor
彩 岡本
尚子 後藤
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シャープ株式会社
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Publication of WO2019064798A1 publication Critical patent/WO2019064798A1/fr

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    • 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
    • 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
    • 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
    • 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

Definitions

  • the following disclosure relates to backlight lighting control.
  • Patent Document 1 An example of the technology is disclosed in Patent Document 1.
  • the light control value (emission intensity) is set independently for each region in the backlight according to the feature amount and motion vector information of the moving object in the input moving image.
  • virtual motion vector information is added even in a region where there is no moving object, and the light control value is set according to the vector amount.
  • the light control value to be set is the same regardless of the position of the moving object in the region in the input image corresponding to the above region. Therefore, unnatural halo may occur as the moving object moves in the area.
  • the light control value is not set unless the moving object moves across the regions. Therefore, when such movement is performed, the dimming value may change significantly. In this case, flicker occurs on the display.
  • One aspect of the present disclosure is to suppress image quality deterioration of a displayed image.
  • a display device includes: a backlight divided into a plurality of control areas that can change emission intensity independently of each other; And a backlight control unit for controlling lighting of the light, wherein an area having a gradation value higher than that of the other area in the input image is set as a high gradation area, and the display of the high gradation area among the plurality of control areas A control area related to the reference control area, a position of a portion corresponding to the high gradation area in the reference control area is a high luminance position, and the backlight control unit changes the input image in the reference control area Control the light emission intensity of the control area other than the reference control area in accordance with the change of the high luminance position accompanying the Increased.
  • FIG. 2 is a functional block diagram showing the configuration of the main part of the display device according to Embodiment 1.
  • (A) to (c) are each a diagram for explaining a control area. It is a figure showing an example of a plurality of control areas. It is a figure which shows roughly an example of a process of the display apparatus of FIG. It is a figure which illustrates the flow of processing of luminescence control in the display of FIG. It is a figure which shows an example of the backlight lighting image in the display apparatus as a comparative example. It is a figure which shows an example of the backlight lighting image in the display apparatus of FIG. It is a figure which shows the case where a high gradation area
  • FIG. 11 It is a figure showing roughly an example of processing of a display concerning a modification.
  • (A) And (b) is a figure which shows the display apparatus which concerns on one modification, respectively.
  • (A)-(c) is a figure which shows the two-dimensional distribution of LED (i, j) respectively shown by LUT1-LUT3.
  • (A) to (c) are views showing backlight lighting images obtained when using LUT1 to LUT3 of FIG. 11, respectively.
  • FIG. 1 is a functional block diagram showing the configuration of the main part of the display device 1 of the first embodiment.
  • the display device 1 includes a control unit 10, an image input unit 70, a display unit 80, and a storage unit 90.
  • the image input unit 70 acquires data (image data) of an image to be displayed by the display device 1 (display unit 80).
  • the image represented by the image data acquired by the image input unit 70 is also referred to as an input image.
  • an input image is each frame which comprises a moving image (input moving image).
  • the display unit 80 includes a backlight 81 and a display panel 82.
  • the display panel 82 is, for example, a liquid crystal panel.
  • a plurality of pixels are arranged in a matrix.
  • the display panel 82 may include a color filter (not shown).
  • the horizontal direction horizontal direction, column direction
  • the vertical direction vertical direction, row direction
  • horizontal direction is indicated by the letter x or the letter i.
  • vertical direction is indicated by the letter y or the letter j (for example, see FIG. 3 described later).
  • the backlight 81 illuminates the display panel 82 with light (eg, white light).
  • the backlight 81 is disposed on the back side (the side opposite to the display surface) of the display panel 82 so as to overlap with the display panel 82.
  • the backlight 81 is provided with a plurality of light sources 810 (see FIG. 3).
  • the light source 810 is, for example, an LED (Light Emitting Diode).
  • the backlight 81 may be provided with a light guide plate (not shown).
  • a light guide plate By light emitted from the light source 810 of the backlight 81 to the display panel 82, an image can be formed by a plurality of pixels on the display surface (display area) of the display panel 82. That is, an image can be displayed in the display area.
  • the control unit 10 controls each part of the display device 1 in an integrated manner.
  • the control unit 10 includes a backlight emission intensity determination unit 11 (backlight control unit), a backlight control unit 12, a display data generation unit 13, and a display panel drive unit 14.
  • the display panel drive unit 14 drives the display panel 82.
  • the display panel drive unit 14 outputs to the display panel 82 a signal (voltage signal) for controlling the light transmittance of each pixel of the display panel 82.
  • a signal voltage signal
  • the display panel drive unit 14 may cause the display panel 82 to display an after-correction image represented by the after-correction image data (described later) acquired from the display data generation unit 13.
  • the backlight control unit 12 drives the backlight 81 (more specifically, the light source 810).
  • the backlight control unit 12 outputs a drive signal (for example, a current signal) to each of the plurality of light sources 810 based on light emission intensity data (described later) acquired from the backlight light emission intensity determination unit 11.
  • the drive signal can cause each of the plurality of light sources 810 to emit light at the emission intensity indicated by the emission intensity data.
  • the backlight 81 is divided into a plurality of control areas (for example, nine control areas such as Area (1, 1) to Area (3, 3)) described later.
  • the backlight control unit 12 controls lighting of the backlight 81 for each control area. That is, the backlight control unit 12 controls the light emission intensity of the backlight 81 by local dimming.
  • each of the plurality of control areas includes one or more light sources 810.
  • the backlight control unit 12 controls the light emission intensity of the light source 810 for each control area.
  • the backlight emission intensity determination unit 11 includes a distance calculation unit 110, an emission intensity calculation unit 111, an emission intensity setting unit 112, and an emission intensity adjustment unit 113. The processing of each functional unit of the backlight emission intensity determination unit 11 will be described later. As described below, the backlight emission intensity determination unit 11 determines the emission intensity of the light source 810 for each control area. The backlight emission intensity determination unit 11 generates emission intensity data indicating the emission intensity.
  • the backlight control unit 12 drives the light source 810 for each control area based on the emission intensity data acquired from the backlight emission intensity determination unit 11 (in other words, drives the backlight 81).
  • the backlight control unit 12 may have the function of the backlight emission intensity determination unit 11 as well. That is, the backlight control unit 12 and the backlight emission intensity determination unit 11 may be provided as an integral functional unit.
  • the display data generation unit 13 includes a luminance distribution calculation unit 130 and an image data correction unit 131.
  • the display data generation unit 13 generates corrected image data based on the light emission intensity data acquired from the backlight light emission intensity determination unit 11. The processes of the luminance distribution calculating unit 130 and the image data correcting unit 131 will be described later.
  • FIG. 2 is a diagram for explaining the control area. Specifically, (a) to (c) in FIG. 2 respectively indicate a plurality of control areas (for example, nine Area (1, 1) to Area (3, 3)) set in the backlight 81. It is a figure for demonstrating one control area (Area (i, j)) of.
  • FIG. 3 is a diagram showing Area (1, 1) to Area (3, 3) as an example of the plurality of control areas.
  • the solid line in FIG. 3 indicates the boundary of each pixel.
  • the broken lines in FIG. 3 indicate the boundaries of the control areas.
  • the direct-type backlight means a backlight in which a plurality of light sources 810 are disposed on the back of the display panel 82 in addition to the peripheral portion of the backlight 81.
  • each of nine control areas is the same as the control area of (a) of FIG. 2 is illustrated.
  • i and j are symbols indicating the horizontal and vertical positions (numbers) of the respective control areas in the display area.
  • i and j are integers that satisfy 1 ⁇ i ⁇ 3 and 1 ⁇ j ⁇ 3, respectively.
  • Area (1, 1) Of the nine control areas, the top left area
  • Area (2, 2) Of the nine control areas, the central area
  • Area (3, 3) Of the nine control areas, the lower right area; It is.
  • the positive direction of i is set to the right, and the positive direction of j is set to the lower.
  • x and y are symbols indicating the horizontal and vertical positions (numbers) of the pixels in the entire display area, respectively.
  • x and y are integers that satisfy 1 ⁇ x ⁇ 30 and 1 ⁇ y ⁇ 30, respectively.
  • the positive direction of x and y is set similarly to i and j.
  • P (x, y) P (9, 2) exists at the position of "the ninth from the left side of the display area and the second from the upper side of the display area" Indicates a pixel.
  • a high gradation area HGA An area in the input image where the gradation value is higher than that of the other area is called a high gradation area HGA.
  • the high gradation area HGA (a white rectangular area having 4 horizontal pixels and 3 vertical pixels) is included in the partial display area corresponding to Area (2, 2).
  • the control area related to the display of the high gradation area HGA is referred to as a reference control area SCA.
  • Area (2, 2) is the reference control area SCA.
  • the position of the portion corresponding to the high gradation area HGA in the reference control area SCA is referred to as a high luminance position HIP.
  • the control area means an area (unit of partial area) in which the light emission intensity can be changed independently of each other in the backlight 81.
  • the definition of the control area will be specifically described with reference to FIG. 2 again.
  • FIG. 2 shows the case where Area (i, j) is an area in which one light source 810 can be driven individually.
  • Area (i, j) includes one light source 810.
  • the backlight 81 of FIG. 3 includes nine light sources.
  • the light source 810 is located at the center Center (i, j) of Area (i, j).
  • Center (i, j) corresponds to the position of one light source 810 that can be driven individually.
  • Center (i, j) is a coordinate indicating the center position of Area (i, j). Center (i, j) may be used as a point representing the position of Area (i, j) (position representative point). Center (i, j) is represented by xy coordinates.
  • FIG. 2B shows the case where Area (i, j) includes four light sources 810.
  • the four light sources 810 are connected in series. Thus, the four light sources 810 are driven in conjunction with one another.
  • FIG. 2B illustrates the case where four light sources 810 can be driven.
  • the four light sources 810 are respectively located in the vicinity of Center (i, j) so as to surround the center Center (i, j) of Area (i, j).
  • FIG. 2C shows the case where Area (i, j) is defined by four light sources 810 that can be driven individually one by one.
  • Area (i, j) is set as an area surrounded by four light sources 810.
  • the four light sources 810 are respectively disposed at the four corners of the Area (i, j).
  • Center (i, j) does not have to be set based on only the position of one light source 810 that can be individually driven.
  • the light source 810 also belongs to another control area adjacent to the Area (i, j).
  • the light source 810 belongs to at most four control areas.
  • emission intensity of control area means the average luminance of the control area or the peak luminance of the control area.
  • the emission intensity of the control area is controlled by controlling the emission intensity of the light source 810 in the control area.
  • the distance calculation unit 110 controls the pixel P (x, y) and the control area Area (i, j) (example of each pixel P (x, y) in the display area (each pixel forming the input image). : Calculate the distance d to a predetermined point (eg, position representative point) of Area (1, 1) to Area (3, 3).
  • a predetermined point eg, position representative point
  • the backlight emission intensity determination unit 11 calculates the distance between the pixel P (x, y) and the center Center (i, j) of the control area Area (i, j) as the distance d.
  • the distance d means the inter-pixel distance between the pixel P (x, y) and the center Center (i, j).
  • the unit of the distance d is a pixel.
  • the inter-pixel distance means the Euclidean distance between pixels. For example, the inter-pixel distance between P (1,1) and P (2,2) is ⁇ 2 pixels.
  • An operation (a function in programming) for calculating the distance d is expressed as Dist (P (x, y), Area (i, j)).
  • the calculation of the distance d may be performed using a known algorithm.
  • the distance calculation unit 110 preferably calculates the distance d for all control areas. However, from the viewpoint of reduction of calculation cost, the distance calculation unit 110 may calculate the distance d for only a part of the control area.
  • the light emission intensity calculator 111 calculates candidate values (emission intensity) of the light emission intensity of the light source 810 included in each control area Area (i, j) for each of the pixels P (x, y) based on the distance d. Calculate candidate value).
  • the light emission intensity candidate value is also referred to as LED (i, j).
  • LED (i, j) (k / d) ⁇ L (x, y) (1) LED (i, j) is calculated by
  • L (x, y) is a gradation value (for example, an integer of 0 or more and 255 or less) of the pixel P (x, y).
  • the gradation value is used as an index indicating the luminance of the pixel P (x, y). Specifically, the luminance of the pixel P (x, y) is higher as the gradation value is larger. Further, the smaller the gradation value, the lower the luminance of the pixel P (x, y).
  • K is a constant.
  • the value of k may be arbitrarily set (changed) by the user.
  • the value of LED (i, j) is inversely proportional to d. That is, as d increases, LEDs (i, j) decrease.
  • LED (i, j) increases.
  • the method of calculating the LED (i, j) in the case of d ⁇ 0 is not limited to that using the equation (1).
  • the LED (i, j) may be calculated by
  • the value of the LED (i, j) may be inversely proportional to d 2.
  • the LEDs (i, j) can be more significantly reduced as the d is increased, as compared with the case where the equation (1) is used.
  • the LED (i, j) may be set using the threshold d limit of the distance d.
  • the value of d limit may be arbitrarily set by the user.
  • the LED (i, j) may be calculated by
  • non-zero LEDs (i, j) are set only if the distance d does not exceed d limit . That is, the non-zero LED (only in the control area relatively close to the pixel P (x, y)), ie, the light source 810 relatively close to the pixel P (x, y) i, j) can be set.
  • the method of setting the LED (i, j) in the light emission intensity calculation unit 111 is not particularly limited. Specifically, the light emission intensity calculator 111 causes the LED (i, j) to increase as the distance d decreases (in other words, to decrease the LED (i, j) as the distance d increases) , LED (i, j) can be set.
  • the smaller the distance d, the smaller the LED (i, j) means that “the LED (i, j) has a broad monotonically decreasing relationship with the distance d”. (See, for example, equation (4)).
  • the light emission intensity setting unit 112 performs statistical processing on the LED (i, j) calculated for each pixel by the light emission intensity calculation unit 111. Then, the light emission intensity setting unit 112 calculates the light emission intensity representative value LED 2 (i, j) for each control area (Area (i, j)) as a result of the statistical processing of the LED (i, j).
  • the light emission intensity setting unit 112 determines the maximum value of the LEDs (i, j) for each control area. Specifically, the light emission intensity setting unit 112 sets the value (hereinafter, tmp) of the LED (i, j) calculated for a pixel P (x, y) in one control area to the value of the control area. Compare with the maximum value of the LED (i, j) already calculated for the other pixels (hereinafter, max).
  • the maximum value of all the LEDs (i, j) in the control area can be set as a final value of tmp (hereinafter, tmp 2).
  • the light emission intensity setting unit 112 performs the above-described process on all the control areas (Area (1, 1) to Area (3, 3)) to make the light emission intensity representative value LED 2 (1 , 1) to LED 2 (3, 3).
  • FIG. 4 is a program code schematically showing an example of processing of the distance calculation unit 110 to the light emission intensity setting unit 112.
  • the case where Formulas (1) and (2) are used in the calculation in the light emission intensity calculation unit 111 is shown. It should be noted that the variables shown in FIG. 4 do not necessarily coincide with the above description.
  • the final value of “LED (i, j) in FIG. 4” corresponds to LED 2 (i, j) in the above description.
  • program code of FIG. 4 may be understood as schematically illustrating the process of the backlight emission intensity determination unit 11 when the emission intensity adjustment unit 113 is omitted. The same applies to FIG. 9 to be described later.
  • the calculation method of LED (i, j) in the light emission intensity calculation part 111 is not specifically limited. Therefore, the setting method of the LED 2 (i, j) in the light emission intensity setting unit 112 is not particularly limited.
  • the light emission intensity setting unit 112 sets, for each of the plurality of control areas, (i) gradation values (L (x, y)) of the plurality of pixels (P (x, y)) constituting the input image; , (Ii) by performing statistical processing based on the distance (for example, distance d) between each of the pixels and each predetermined position of the control area (for example, each central position of the control area), the LED 2 (i, j) should be set.
  • the light emission intensity adjustment unit 113 corrects the LED 2 (i, j) calculated by the light emission intensity setting unit 112, and sets a light emission intensity (hereinafter, LED 3 (i, j)).
  • the final value of the light emission intensity of the light source 810 set by the backlight light emission intensity determination unit 11 for the LED 3 (i, j) (specifically, LED 3 (1, 1) to LED 3 (3, 3)) It becomes.
  • the light emission intensity adjustment unit 113 generates data indicating LED 3 (1, 1) to LED 3 (3, 3) as light emission intensity data. Then, the light emission intensity adjustment unit 113 supplies the light emission intensity data to the backlight control unit 12 and the display data generation unit 13.
  • a known process may be used for the correction in the light emission intensity adjustment unit 113.
  • the correction may be processing of multiplying LED 2 (i, j) by a predetermined coefficient or processing of adding (offset) a predetermined constant to LED 2 (i, j).
  • the light emission intensity adjustment unit 113 is not an essential functional unit. When the correction of the LED 2 (i, j) is not necessary, the light emission intensity adjustment unit 113 can be removed from the backlight light emission intensity determination unit 11. In this case, the LED 2 (i, j) calculated by the light emission intensity setting unit 112 is the final light emission intensity set by the backlight light emission intensity determination unit 11.
  • the LED 2 (i, j) (emission intensity representative value) may be used as it is as the final emission intensity.
  • the light emission intensity setting unit 112 generates data indicating LED 2 (1, 1) to LED 2 (3, 3) as light emission intensity data. Then, the light emission intensity setting unit 112 supplies the light emission intensity data to the backlight control unit 12 and the display data generation unit 13.
  • FIG. 5 is a flowchart illustrating the flow of processing S1 to S9 of light emission control in the display device 1.
  • the image input unit 70 acquires data of an input image (input image data) (S1).
  • the distance calculation unit 110 calculates the pixel P (x, y) and the control area (Area (1, 1) for each pixel P (x, y) (each pixel constituting the input image) in the display area. )
  • the light emission intensity calculator 111 calculates light emission intensity candidate values (LED (1, 1) to LED (3, 3)) in each control area based on the distance d for each of the pixels P (x, y). Calculate (S3). As described above, the light emission intensity candidate value is set so as to increase as the distance d decreases.
  • the light emission intensity setting unit 112 determines, for each control area, the maximum value of the light emission intensity candidate values (LED (1, 1) to LED (3, 3)) calculated for each pixel. Then, the light emission intensity setting unit 112 calculates the maximum value of each control area as a light emission intensity representative value (LED2 (1,1) to LED2 (3,3)) in the control area (S4). As described above, the determination of the maximum value is an example of statistical processing for the light emission intensity candidate value.
  • the light emission intensity adjustment unit 113 corrects the light emission intensity representative value, and determines the final values (LED 3 (1, 1) to LED 3 (3, 3)) of the light emission intensity of the light source 810 (S5). Then, the light emission intensity adjustment unit 113 supplies the light emission intensity data indicating the value to the backlight control unit 12 and the display data generation unit 13.
  • the backlight control unit 12 acquires light emission intensity data from the backlight light emission intensity determination unit 11 (more specifically, the light emission intensity adjustment unit 113). Then, the backlight control unit 12 controls the light source 810 according to the light emission intensity (LED 3 (1, 1) to LED 3 (3, 3)) indicated in the light emission intensity data, and the control area (Area (1, 1) to Area). Control individually for each (3, 3). As described above, the backlight control unit 12 independently controls the light emission intensity of each control area of the backlight 81 based on the light emission intensity data (S6).
  • the luminance distribution calculation unit 130 acquires light emission intensity data from the backlight light emission intensity determination unit 11.
  • the luminance distribution calculation unit 130 calculates the luminance distribution on the display panel 82 (example: liquid crystal panel) based on the light emission intensity data (S7).
  • the image data correction unit 131 corrects the input image data based on the luminance distribution on the display panel 82, and generates corrected image data (S8). For example, when the light emission intensity of a certain light source 810 is set small, the luminance of the partial display area including the light source 810 may be insufficient.
  • the image data correction unit 131 calculates the luminance on the display panel 82 at a certain pixel calculated by the luminance distribution calculation unit 130 when all the light sources 810 of the backlight 81 are lit at the maximum luminance.
  • the luminance is 1/2 of the luminance on the display panel 82 in the pixel, the gradation value is doubled.
  • the image data correction unit 131 corrects such gradation values to generate an image after correction. Then, the image data correction unit 131 generates data indicating the image after correction as image data after correction. The image data correction unit 131 supplies the corrected image data to the display panel drive unit 14. The display panel drive unit 14 supplies the image data after correction to the display panel 82, and drives the display panel 82 (S9). As a result, the display panel 82 can display the corrected image.
  • the display data generation unit 13 can be omitted.
  • the display panel drive unit 14 supplies input image data to the display panel 82 and drives the display panel 82. That is, the display panel 82 can display an input image.
  • FIG. 6 is a view showing an example of a backlight lighting image in a display device 1 r as a comparative example.
  • the light emission intensity of the light source 810 is set by a conventional technique. In the following example, it is assumed that 25 (5 ⁇ 5) control areas (Area (1, 1) to Area (5, 5)) are provided. Further, as in FIG. 3, it is assumed that one light source 810 is included at the center of each control area. Further, the emission intensity of the light source 810 (hereinafter, LED emission intensity) is represented by the LED lighting rate (unit:%).
  • the moving image represents a situation in which a white (high gradation) rectangular object moves in the horizontal direction (right direction on the paper) with respect to a black (low gradation) background. Is illustrated.
  • an image (input image) showing one frame of the moving image is displayed in order of time ta, tb and tc.
  • FIG. 6 shows a “backlight on image” schematically showing how the backlight 81 is on.
  • the display screen at each time and the lighting state of the backlight 81 corresponding to the display screen are shown together.
  • the reference control area SCA (control area related to the display of the high gradation area HGA) is Area (3, 3). Therefore, the high luminance position HIP (the position of the portion corresponding to the high gradation area HGA) is also located in the Area (3, 3) (reference control area SCA).
  • the reference control area SCA is changed to Area (4, 3) as the moving object moves with the passage of time. For this reason, the high-intensity position HIP is also located in the Area (4, 3) (reference control area SCA).
  • the LED emission intensity is determined (calculated) using the maximum gradation value or the average gradation value of the image displayed in the partial display area corresponding to each control area.
  • the “emission intensity calculation result” of FIG. 6 shows the LED emission intensity in each control area determined in the prior art.
  • the “emission intensity correction value” in FIG. 6 indicates the LED emission intensity in each control area after the correction is performed in the related art.
  • the light emission intensity is corrected to 30 in eight control areas adjacent to the Area (3, 3) (reference control area SCA).
  • the light emission intensity is corrected to 10 in the 16 control areas (the peripheral portion of the backlight 81) not adjacent to the Area (3, 3).
  • the light emission luminance correction value is set to be vertically symmetrical and laterally symmetrical with respect to the reference control area SCA.
  • the light emission intensity is corrected to 30 in eight control areas adjacent to Area (4, 3) (reference control area SCA). Further, among the control areas not adjacent to the Area (4, 3), the light emission intensity is corrected to 10 in the eleven control areas (the peripheral part of the backlight 81) excluding the left end part of the backlight 81. In the five control areas at the left end of the backlight 81, the light emission intensity is not corrected and remains zero.
  • the light emission intensity in each control area does not change and remains constant unless the maximum gradation value or the average gradation value in each control area changes (see: time ta) , Tb). That is, in the prior art, the light emission intensity of the control area (hereinafter, non-reference control area) other than the reference control area SCA is not changed according to the change of the high luminance position HIP in the reference control area SCA. .
  • the shape of the light distribution in the backlight 81 tends to be asymmetrical with respect to the high gradation area HGA (high luminance position HIP) (refer to the vertical direction shown in the backlight lighting image at time ta) And left and right direction arrows). Therefore, an unnatural halo occurs for the viewer of the display screen.
  • HGA high luminance position HIP
  • the LED emission intensity in all control areas is suddenly changed.
  • the LED emission intensity in each control area is suddenly changed.
  • the combination of the light sources 810 to be lit is suddenly changed (reference: time tb, tc). Therefore, flicker occurs on the display screen.
  • FIG. 7 is a view showing an example of a backlight lighting image in the display device 1. Also in the example of FIG. 7, the arrangement of each control area and the light source 810 is the same as that of FIG. 6. Further, the state of the change of the position of the high gradation area HGA (the movement of the moving object) with the passage of time is the same as that of FIG.
  • FIG. 7 shows (i) the LED emission intensity (emission intensity calculation result) of each control area at each of the times ta, tb and tc, and (ii) the backlight lighting image.
  • the LED emission intensity in FIG. 7 indicates the above-mentioned LED 3 (i, j) (final value of the emission intensity of the light source 810 set by the backlight emission intensity determination unit 11).
  • the backlight emission intensity determination unit 11 can set the LED emission intensity based on the distance d (the distance between each pixel and the center of each control area). Therefore, the LED emission intensity can be set (controlled) in consideration of which position in the one reference control area SCA the high luminance position HIP is.
  • the backlight emission intensity determination unit 11 can set the LED emission intensities of the plurality of control areas according to the change of the high luminance position HIP in one reference control area SCA accompanying the change of the input image. For example, the backlight emission intensity determination unit 11 sets the LED emission intensity of the reference control area SCA in accordance with the change of the high luminance position HIP.
  • the backlight emission intensity determination unit 11 maximizes the LED emission intensity of the reference control area SCA among the plurality of control areas. That is, the backlight emission intensity determination unit 11 displays the high gradation area HGA of the input image the brightest.
  • the backlight emission intensity determination unit 11 reduces the LED emission intensity of the reference control area as the high luminance position HIP approaches the peripheral portion of the reference control area SCA.
  • the high-intensity position HIP is located near the center of the reference control area SCA (Area (3, 3)). In this case, the LED emission intensity in the reference control area SCA is “89”.
  • the high luminance position HIP is located near the peripheral portion (specifically, near the right end) of the reference control area SCA (Area (3, 3)). In this case, the LED emission intensity in the reference control area SCA is “75”.
  • the reference control area SCA (Area (4, 3)) at time tc is a control area adjacent to the reference control area SCA (Area (3, 3)) at time tb.
  • the high luminance position HIP is located in the vicinity of the peripheral portion (specifically, in the vicinity of the left end) of the reference control area SCA (Area (4, 3)). Also in this case, the LED emission intensity in the reference control area SCA is “75”.
  • the backlight emission intensity determination unit 11 controls the LED emission intensity of the non-reference control area (a control area other than the reference control area SCA) according to the change of the high luminance position HIP in the reference control area SCA. Specifically, the backlight emission intensity determination unit 11 increases the LED emission intensity in the control area closer to the high luminance position HIP among the non-reference control areas.
  • the backlight emission intensity determination unit 11 can change the LED emission intensity dynamically (smoothly and in real time) as the high gradation region HGA moves. Therefore, by dynamically changing the LED emission intensity, the shape of the halo can be made nearly symmetrical with respect to the high gradation region HGA (see: the backlight lighting image at time ta, Vertical and horizontal arrows). That is, the unnaturalness of the halo is eliminated.
  • the LED emission intensity of the reference control area is set to be lower (reference: times ta and tb). Therefore, even at the moment when the high gradation area HGA crosses the partial display area (the moment when the high luminance position HIP crosses the control area), the change in the LED light emission intensity in each control area is gradual compared to the prior art. (See: time tb, tc). As a result, flicker occurring on the display screen can be significantly reduced as compared to the prior art.
  • the backlight emission intensity determination unit 11 “(1) set LED emission intensity of each control area” ⁇ “(2) correct LED emission intensity around the reference control area SCA There is no need to perform two-step processing. That is, the backlight emission intensity determination unit 11 does not need to perform the correction process in the related art (the process for reducing the halo in the related art).
  • the calculation cost of the backlight emission intensity determination unit 11 can be reduced compared to the prior art.
  • the size of the circuit for realizing the backlight emission intensity determination unit 11 can be reduced as compared with the prior art.
  • the backlight emission intensity determination unit 11 can set the LED emission intensity even for one input image. Therefore, the delay time can be made sufficiently short as compared with the prior art.
  • the backlight emission intensity determination unit 11 unlike the prior art, in the distribution of LED emission intensity, it is difficult for the large value of the LED emission intensity to be concentrated only in one control area (especially the reference control area SCA) become. Therefore, the burden on the display device 1 (in particular, the backlight 81) can be reduced. In addition, the power consumption of the display device 1 can also be reduced.
  • the size of the high gradation area HGA is smaller than the size of the control area.
  • the size of the high gradation area HGA may be equal to or larger than the size of the control area. Also in this case, the same effect can be obtained.
  • the high gradation region HGA may be formed of only one pixel (high gradation pixel).
  • FIG. 8 is a diagram showing a case where the high gradation area HGA is configured by only one pixel.
  • the high gradation area HGA is configured by only one pixel P (13, 13). Also in this case, the same effect as that of the first embodiment can be obtained.
  • the process of light emission control for high gradation area HGA (eg, high gradation area HGA in FIG. 3) formed of a plurality of high gradation pixels is performed. It can also be done.
  • the process of determining the maximum value of the LEDs (i, j) is illustrated as an example of the statistical process for the LEDs (i, j) calculated for each pixel.
  • the statistical process is not limited to the process of determining the maximum value.
  • the statistical process may be a process of calculating an average value of the LEDs (i, j).
  • the light emission intensity setting unit 112 may calculate the average value of the LEDs (i, j) as the LED 2 (i, j).
  • FIG. 9 is a program code schematically showing an example of processing of the distance calculation unit 110 to the light emission intensity setting unit 112 according to a modification. The processes of the distance calculation unit 110 and the light emission intensity calculation unit 111 are the same as in FIG.
  • the light emission intensity setting unit 112 adds the values (tmp) of the LEDs (i, j) of each pixel in each control area. Then, the light emission intensity setting unit 112 calculates the sum (tmpsum) of tmp in each control area.
  • the backlight 81 may be an edge type.
  • the edge-type backlight means a backlight in which a plurality of light sources 810 are disposed only at the periphery of the backlight 81. The same effect can be obtained by using the edge type backlight 81.
  • FIG. 10 show display devices 1 u and 1 v provided with an edge type backlight 81, respectively.
  • the light source 810 may be disposed only at the lower end of the backlight 81.
  • the light source 810 may be disposed at the upper end and the lower end of the backlight 81.
  • the backlight 81 is divided into three only in the horizontal direction, and three control areas are set. However, the backlight 81 may be divided only in the vertical direction to set a plurality of control areas. In the display device 1v, the backlight 81 is divided into six, and six control areas are set. Specifically, the backlight 81 is divided into three in the horizontal direction and two in the vertical direction, and six control areas are set.
  • the number of divisions in the vertical direction may be different from the number of divisions in the horizontal direction. Also, the sizes of the plurality of control areas may be different.
  • the light emission intensity calculation unit 111 may set the LED (i, j) according to the distance d using a LUT (Look-Up Table, look-up table).
  • the LUT may be a two-dimensional LUT showing a two-dimensional distribution of the LEDs (i, j).
  • a Gaussian distribution hereinafter simply referred to as a Gaussian distribution.
  • Each of LUT1 to LUT3 has a Gaussian distribution with different half width.
  • the LUT 1 exhibits a Gaussian distribution (hereinafter, referred to as a first Gaussian distribution) having the narrowest half width.
  • LUT3 indicates a Gaussian distribution (hereinafter, referred to as a third Gaussian distribution) having the widest half width.
  • LUT2 has a Gaussian distribution (hereinafter, referred to as a second Gaussian distribution) whose half width is wider than the first Gaussian distribution and narrower than the third Gaussian distribution.
  • the two-dimensional distribution of the LEDs (i, j) indicated by the LUT is not limited to the Gaussian distribution.
  • the distribution may be set experimentally or by design.
  • the LUT may be stored, for example, in the storage unit 90.
  • the LUT stored in the storage unit 90 may be changeable by the user.
  • FIG. 12 shows a backlight lighting image in the second embodiment. Specifically, (a) to (c) in FIG. 12 show backlight lighting images obtained when using LUT1 to LUT3, respectively.
  • the LED emission intensity (emission intensity calculation result) of each control area can be changed by changing the LUT used by the emission intensity calculation unit 111. That is, since the lighting pattern of the backlight 81 can be changed, it is possible to change how much halo and flicker occur on the display screen.
  • the display device 1 may be provided with an illuminance sensor (not shown) that detects ambient illuminance.
  • the light emission intensity calculator 111 can select one LUT from LUT1 to LUT3 based on the illuminance (hereinafter, Ls) detected by the illuminance sensor.
  • the contrast of the display screen may be increased using LUT1. Therefore, the light emission intensity calculator 111 may select LUT1 when Ls is equal to or greater than the first illuminance threshold.
  • the light emission intensity calculator 111 may select the LUT 3 when Ls is equal to or less than the second illuminance threshold.
  • the second illuminance threshold needs to be set to a value smaller than the first illuminance threshold.
  • the light emission intensity calculator 111 may select LUT2.
  • LUT2 may be used when the brightness of the surrounding environment is medium.
  • the display device 1 (control unit 10) may be provided with an area calculation unit (not shown) that calculates the area of the high gradation region HGA.
  • the calculation of the area of the high gradation area HGA may be performed by known algorism.
  • the light emission intensity calculation unit 111 can select one LUT from LUT1 to LUT3 based on the area (hereinafter, Ss) of the high gradation area HGA detected by the area calculation unit.
  • the light emission intensity calculator 111 may select LUT1 when Ss is equal to or greater than the first area threshold.
  • the light emission intensity calculation unit 111 may select LUT3 when Ss is equal to or less than the second area threshold. Note that the second area threshold needs to be set to a value smaller than the first area threshold.
  • the light emission intensity calculator 111 may select LUT2.
  • the LUT 2 may be used when the area Ss is medium.
  • the control block (in particular, the control unit 10) of the display device 1 may be realized by a logic circuit (hardware) formed in an integrated circuit (IC chip) or the like, or may be realized by software.
  • the display device 1 includes a computer that executes instructions of a program that is software that implements each function.
  • the computer includes, for example, at least one processor (control device) and at least one computer readable storage medium storing the program.
  • the processor reads the program from the recording medium and executes the program to achieve the object of one aspect of the present disclosure.
  • a CPU Central Processing Unit
  • the above-mentioned recording medium a tape, a disk, a card, a semiconductor memory, a programmable logic circuit or the like can be used besides “a non-temporary tangible medium”, for example, a ROM (Read Only Memory).
  • a RAM Random Access Memory
  • the program may be supplied to the computer via any transmission medium (communication network, broadcast wave, etc.) capable of transmitting the program.
  • any transmission medium communication network, broadcast wave, etc.
  • one aspect of the present disclosure may also be realized in the form of a data signal embedded in a carrier wave in which the program is embodied by electronic transmission.
  • the display device (1) according to aspect 1 of the present disclosure includes a plurality of control areas (Area (i, j)) that can change emission intensity independently of each other (for example, Area (1, 1) to Area in FIG. 7). (5, 5) and the backlight control unit (the backlight emission intensity determination unit 11 and the backlight control unit 12) that controls lighting of the backlight for each of the control areas and the backlight (81)
  • An area in which the gradation value is higher than the other areas in the input image is defined as a high gradation area (HGA), and a control area related to display of the high gradation area among the plurality of control areas is reference control Area (SCA) (for example, Area (3, 3) at time ta ⁇ tb and Area (4, 3) at time tc in FIG.
  • the position of the portion is a high brightness position (HIP)
  • the backlight control unit controls the control area other than the reference control area according to the change of the high brightness position in the reference control area according to the change of the input image.
  • the light emission intensity is controlled, and the light emission intensity is increased as the control area is closer to the high luminance position.
  • the above configuration compared to the configuration in which the light emission intensity of the control area other than the reference control area (the non-reference control area described above) is not changed according to the change of the high luminance position in the reference control area It is possible to suppress the occurrence of unnatural halo that may occur when the high-intensity position moves. Moreover, it is possible to suppress display flicker that may occur when the reference control area changes from an arbitrary control area to an adjacent control area. So, according to the said display apparatus, the image quality deterioration of the image displayed can be suppressed.
  • the backlight control unit may control the light emission intensity of the reference control area in accordance with a change in the high luminance position in the reference control area.
  • the light emission intensity of the reference control area is also controlled according to the change of the high luminance position in the reference control area. Therefore, the generation of the above-mentioned unnatural halo and the flickering of the display can be further suppressed.
  • the backlight control unit may lower the light emission intensity of the reference control area as the high luminance position approaches the peripheral portion of the reference control area.
  • the generation of the above-mentioned unnatural halo and the flickering of the display can be suppressed more accurately.
  • the backlight control unit may make the light emission intensity of the reference control area the highest among the plurality of control areas.
  • the high gradation area of the input image can be displayed brightest.
  • each of the plurality of control areas includes one or more light sources (810), and the backlight control unit controls the one or more light sources for each control area.
  • the light emission intensity of the light may be controlled.
  • the emission intensity of each control area can be controlled by controlling the emission intensity of the light source.
  • the display device may be realized by a computer.
  • the computer is operated as each unit (software element) included in the display device, and the display device is operated by the computer.
  • a backlight control program for a display device to be realized, and a computer readable recording medium recording the same also fall within the scope of one aspect of the present disclosure.
  • an image display apparatus includes a display panel including a plurality of display elements, a backlight divided into a plurality of control areas, and capable of controlling light emission intensity for each control area, and an input image
  • a data generation unit a display panel drive unit that drives the display panel based on the display data
  • a backlight control unit that controls the backlight based on the light emission intensity of each control area;
  • one pixel at a position other than the center in any control area of the plurality of control areas is a high gradation pixel, and the other pixels are low
  • the backlight emission intensity determination unit maximizes the emission intensity of the control area including the high gradation pixel, and the high gradation pixel is set for the other control areas
  • an image display device is a display panel including a plurality of display elements, and a backlight divided into a plurality of control areas, each of the control areas being in the control area.
  • a backlight having one or more light sources belonging to a control area, wherein the light emission intensity of the one or more light sources belonging to the control area can be controlled for each control area, an image input unit for inputting an input image, and the input
  • a backlight emission intensity determination unit that determines emission intensities of the one or more light sources belonging to each control area according to an image, and a display data generation unit that generates display data based on the input image and the emission intensities of the light sources
  • a display panel drive unit that drives the display panel based on the display data; and a backlight control unit that controls the backlight based on the light emission intensity of the light source.
  • the backlight emission intensity determination unit maximizes the emission intensity of the one or more light sources belonging to the control area including the high gradation pixel, and the control area is close to the high gradation pixel for the other control areas.
  • the emission intensity of the one or more light sources belonging to the control area is increased.

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  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Theoretical Computer Science (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Nonlinear Science (AREA)
  • Liquid Crystal (AREA)
  • Mathematical Physics (AREA)
  • Optics & Photonics (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

La présente invention supprime la détérioration de qualité d'image d'une image affichée. Un rétroéclairage d'un dispositif d'affichage (1) est divisé en une pluralité de zones de commande où les intensités d'émission peuvent être modifiées indépendamment les unes des autres. Parmi les zones de commande, une zone de commande impliquée dans l'affichage d'une zone à gradation élevée (HGA) d'une image d'entrée est définie en tant que zone de commande standard (SCA) et la position d'une partie de la zone de commande standard (SCA) correspondant à la zone à gradation élevée (HGA) est définie en tant que position haute intensité (HIP). Une unité de commande de rétroéclairage du dispositif d'affichage (1) commande les intensités d'émission des zones de commande autres que la zone de commande standard (SCA) en fonction d'un changement de la position haute intensité (HIP) dans la zone de commande standard (SCA), et augmente les intensités d'émission des zones de commande davantage pour des zones de commande situées plus près de la position haute intensité (HIP).
PCT/JP2018/025509 2017-09-27 2018-07-05 Dispositif d'affichage WO2019064798A1 (fr)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011013402A1 (fr) * 2009-07-30 2011-02-03 シャープ株式会社 Dispositif d’affichage d’images et procédé d’affichage d’images
US20110148941A1 (en) * 2009-12-18 2011-06-23 Dong-Woo Kim Driving method for local dimming of liquid crystal display device and apparatus using the same
WO2013121707A1 (fr) * 2012-02-13 2013-08-22 パナソニック株式会社 Dispositif d'affichage et procédé d'affichage

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011013402A1 (fr) * 2009-07-30 2011-02-03 シャープ株式会社 Dispositif d’affichage d’images et procédé d’affichage d’images
US20110148941A1 (en) * 2009-12-18 2011-06-23 Dong-Woo Kim Driving method for local dimming of liquid crystal display device and apparatus using the same
WO2013121707A1 (fr) * 2012-02-13 2013-08-22 パナソニック株式会社 Dispositif d'affichage et procédé d'affichage

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