WO2020235177A1 - Dispositif d'afichage d'image et procédé de commande pour dispositif d'affichage d'image - Google Patents

Dispositif d'afichage d'image et procédé de commande pour dispositif d'affichage d'image Download PDF

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Publication number
WO2020235177A1
WO2020235177A1 PCT/JP2020/009544 JP2020009544W WO2020235177A1 WO 2020235177 A1 WO2020235177 A1 WO 2020235177A1 JP 2020009544 W JP2020009544 W JP 2020009544W WO 2020235177 A1 WO2020235177 A1 WO 2020235177A1
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Prior art keywords
brightness
pixel
video signal
pixels
light sources
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PCT/JP2020/009544
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English (en)
Japanese (ja)
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高橋　昌之
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シャープ株式会社
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
    • G09G3/3426—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines the different display panel areas being distributed in two dimensions, e.g. matrix
    • G—PHYSICS
    • 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 present disclosure relates to an image display device and a control method for the image display device.
  • the present application claims priority to Japanese Patent Application No. 2019-099366 filed in Japan on May 17, 2019, the contents of which are incorporated herein by reference.
  • a technology called local dimming technology is known in an image display device that displays an image by irradiating a display panel with illumination light from a backlight.
  • the local dimming technology is a technology that divides the backlight into a plurality of light emitting regions and controls the plurality of light emitting regions independently to increase the contrast in one screen and at the same time suppress the power consumption.
  • Patent Document 1 discloses an example of an image display device using such a local dimming technique.
  • a conversion characteristic is set in which the brightness value of the processing target pixel is lowered as the brightness around the processing target pixel is higher, and gradation conversion is performed using the set conversion characteristic. ing. This makes it possible to compensate for image quality deterioration due to uneven brightness of the displayed image or partial decrease in contrast.
  • the image display device as described above may not be able to display an image faithful to the input video signal depending on the number of light emitting areas among the plurality of light emitting areas.
  • One aspect of the present disclosure is to realize an image display device capable of displaying an image having high fidelity to an input video signal regardless of the lighting state of a plurality of light sources (light emitting regions) that can be independently lit. ..
  • the image display device has a display area in which a plurality of pixels are arranged, a display panel for displaying an image based on an input video signal, and the display area.
  • a plurality of independently lit light sources that illuminate the plurality of pixels in the above
  • a luminance distribution calculation unit that calculates the brightness of illumination light from the plurality of light sources that illuminate each of the plurality of pixels, and attention.
  • the maximum brightness of the illumination light applied to the pixel of interest is set to 1, and the relative value with respect to the brightness calculated by the brightness distribution calculation unit.
  • the image display device has a display area in which a plurality of pixels are arranged, and independently illuminates a display panel that displays an image based on a video signal and the plurality of pixels in the display area.
  • a brightness distribution calculation unit that calculates the brightness of illumination light from the plurality of light sources that is irradiated to each of the plurality of pixels, and a pixel of interest among the plurality of light sources.
  • the maximum brightness of the illumination light applied to the pixel of interest is set as the maximum brightness, and there are pixels whose brightness calculated by the brightness distribution calculation unit is larger than the maximum brightness.
  • a light source data correction unit that reduces the output of some of the light sources is provided so that the brightness calculated by the brightness distribution calculation unit is equal to or less than the maximum brightness.
  • the control method of the image display device has a display area in which a plurality of pixels are arranged, and illuminates a display panel for displaying an image based on a video signal and the plurality of pixels in the display area.
  • a method of controlling an image display device including a plurality of light sources that can be turned on independently, and calculating a brightness distribution for calculating the brightness of illumination light from the plurality of light sources irradiated to each of the plurality of pixels.
  • the brightness calculated in the brightness distribution calculation step where the maximum brightness of the illumination light applied to the attention pixel is set to 1 when only one of the plurality of light sources corresponding to the process and the attention pixel is lit. It includes a correction coefficient calculation step of calculating a relative value of the above, and a video signal correction step of dividing the gradation value of the pixel of interest based on the input video signal by the relative value.
  • the control method of the image display device has a display area in which a plurality of pixels are arranged, illuminates a display panel for displaying an image based on a video signal, and the plurality of pixels in the display area.
  • the maximum brightness of the illumination light applied to the pixel of interest is set as the maximum brightness, and the brightness distribution is calculated.
  • a light source that reduces the output of some of the light sources so that the brightness calculated in the brightness distribution calculation step is equal to or less than the maximum brightness when there is a pixel whose brightness calculated in the step is greater than the maximum brightness. It includes a data correction step.
  • an image having high fidelity to an input video signal can be displayed regardless of the lighting state of a plurality of light sources that can be turned on independently.
  • FIG. (C) is a graph showing the liquid crystal transmittance after correction by the video signal correction unit
  • (d) is a graph showing the display brightness in the display unit 3. It is a figure which shows the state which displayed the solid image of 100% white on the whole surface on the display part.
  • A is a diagram showing the brightness of the window when a small window is displayed on the conventional display device
  • (b) is a diagram showing the brightness of the window when the small window is displayed on the display device. is there.
  • It is a block diagram which shows the structure of the display device which concerns on Embodiment 2.
  • It is a flowchart which shows an example of the processing flow in a display device.
  • It is a block diagram which shows the structure of the display device which concerns on Embodiment 3.
  • FIG. 1 is a block diagram showing a configuration of a display device 1 according to the present embodiment.
  • the display device 1 is an image display device that displays an input image which is an image indicated by an input video signal, and includes a main control unit 2, a display unit 3, and a storage unit 4.
  • the display device 1 may be a portable information terminal or a stationary display device.
  • the main control unit 2 is a device that comprehensively controls the display device 1, and particularly functions as an image processing device.
  • the storage unit 4 stores a program or the like processed by the main control unit 2.
  • the display unit 3 displays the input image processed by the main control unit 2.
  • the display unit 3 is a liquid crystal display.
  • the display unit 3 includes a display panel 31, a display panel drive unit 32, an LED backlight 33 (hereinafter referred to as BL33), and an LED drive unit 34 (hereinafter referred to as BL drive unit 34).
  • the display panel 31 has a display area in which a plurality of pixels 35 are arranged and displays an image based on an input video signal (input video signal), and is a liquid crystal display panel in the present embodiment.
  • the input video signal may be a signal indicating a moving image or a signal indicating a still image.
  • the display panel drive unit 32 drives the display panel 31 with the output value indicated by the liquid crystal data generated by the video signal correction unit 25, which will be described later.
  • the BL drive unit 34 controls the lighting of the BL 33 according to the backlight data (hereinafter, BL data) received from the BL control unit 27. By these drive controls, the input image is displayed on the display panel 31.
  • FIG. 2 is a diagram for explaining an example of display processing using the local dimming function in the display device 1.
  • a region having a high gradation value is shown in a color close to white.
  • the BL 33 includes a plurality of light emitting areas (LEDs) 36 as independently lit light sources that illuminate the plurality of pixels 35 in the display area of the display panel 31.
  • the display device 1 has a local dimming function that controls lighting for each light emitting region 36.
  • the light emitting regions 36 are arranged in a matrix, and in the example shown in FIG. 2, the BL 33 is divided into m ⁇ n light emitting regions 36.
  • Each light emitting area 36 may be realized by one LED, or two or more LEDs may be provided in each light emitting area 36.
  • the light source included in the BL33 is not limited to the LED, and may be another type of light emitting element.
  • the main control unit 2 includes a gamma conversion unit 21, a BL data calculation unit (light source data calculation unit) 22, a brightness distribution calculation unit 23, a correction coefficient calculation unit 24, a video signal correction unit 25, and an inverse gamma. It includes a conversion unit 26 and a BL control unit 27.
  • the gamma conversion unit 21 gamma-converts the input video signal according to the format of the input video signal by referring to a look-up table or the like to obtain a linear signal.
  • the BL data calculation unit 22 calculates the outputs (LED lighting rates) of the plurality of light emitting regions 36 based on the gamma-converted video signal, and the backlight data (BL data) indicating the outputs (see FIG. 2). To generate. Specifically, the input image is divided into an area corresponding to the light emitting area 36 (referred to as a divided display area), and corresponds to the maximum gradation value among the gradation values of the pixels 35 included in each divided display area. As described above, the output of the light emitting region 36 is determined.
  • the gradation value of a pixel 35 when it expresses as "the gradation value of a pixel 35", it means the gradation value corresponding to the pixel 35 of interest among a plurality of gradation values included in an input video signal. To do. It is assumed that the plurality of gradation values and the plurality of pixels 35 included in the input video signal have a one-to-one correspondence.
  • the BL control unit 27 controls the drive of the BL 33 by outputting the BL data generated by the BL data calculation unit 22 to the BL drive unit 34.
  • the brightness distribution calculation unit 23 calculates the brightness of the illumination light (backlight light) from the plurality of light emitting regions 36 that is irradiated to each of the plurality of pixels 35. Specifically, the luminance distribution calculation unit 23 calculates the luminance distribution of BL33 based on the luminance data and the luminance diffusion function (PSF, Point Spread Function) which is data expressing how the light is diffused numerically. To do.
  • PSF Point Spread Function
  • the correction coefficient calculation unit 24 illuminates the attention pixel when only one light emitting region 36 corresponding to one pixel 35 (attention pixel) of the plurality of pixels 35 included in the display panel 31 is lit.
  • a relative value (hereinafter, referred to as a correction coefficient) for the brightness of the illumination light calculated by the brightness distribution calculation unit 23 is calculated for the pixel of interest, with the maximum brightness of 1 being 1.
  • the correction coefficient calculation unit 24 performs this process on all the pixels 35 included in the display panel 31.
  • the inverse gamma conversion unit 26 converts the linear video signal generated by the gamma conversion unit 21 into an inverse gamma according to the display gamma of the display panel 31.
  • the video signal correction unit 25 corrects the gradation value of each pixel 35 indicated by the gamma-converted video signal by using the correction coefficient corresponding to the pixel 35. That is, the video signal correction unit 25 divides the gradation value of the pixel of interest based on the input video signal by the correction coefficient. For example, the video signal correction unit 25 divides the gradation value of each pixel 35 by the correction coefficient corresponding to the pixel 35. Therefore, when the correction coefficient is larger than 1, the gradation value of the pixel of interest to be corrected becomes small, and when the correction coefficient is smaller than 1, the gradation value of the pixel of interest becomes large. The video signal correction unit 25 may multiply the gradation value of each pixel 35 by the reciprocal of the correction coefficient.
  • the video signal correction unit 25 generates a final video signal by referring to the information of the video signal converted to the reverse gamma by the reverse gamma conversion unit 26, and outputs the final video signal as liquid crystal data to the display panel drive unit 32.
  • the liquid crystal data is data indicating the liquid crystal transmittance.
  • FIG. 3 is a diagram showing a luminance distribution when a plurality of light emitting regions 36 emit light. The significance of the processing in the correction coefficient calculation unit 24 and the video signal correction unit 25 will be described.
  • the peaks 51 and 52 are generated by the illumination light from the two light emitting regions 36, respectively.
  • the brightness of the illumination light in the pixel 35 (the pixel of interest) that receives the illumination light from these two light emitting regions 36 can be expressed as a peak 53. That is, the brightness of the illumination light in the pixel 35 increases by the amount indicated by the reference numeral 54.
  • the region indicated by reference numeral 55 corresponds to one light emitting region 36.
  • the correction coefficient calculation unit 24 is based on the input video signal so that even when the pixel of interest is illuminated with the maximum brightness of the peak 53, the same display brightness as when illuminated with the maximum brightness of one light emitting region 36 is realized.
  • a correction coefficient for correcting the gradation value of each pixel 35 is calculated. For example, if the increase indicated by reference numeral 54 is 1.2, the correction coefficient calculation unit 24 calculates 1.2 as the correction coefficient. In this case, the video signal correction unit 25 divides the gradation value of the pixel of interest indicated by the gamma-converted video signal by 1.2.
  • FIG. 4 is a flowchart showing an example of the processing flow in the display device 1.
  • the gamma conversion unit 21 receives the input video signal from an external device, it gamma-converts the input video signal by referring to a look-up table or the like corresponding to the format of the input video signal. Then, it becomes a linear signal (S1).
  • the inverse gamma conversion unit 26 performs inverse gamma conversion in accordance with the display gamma of the display panel 31 from the linear video signal generated by the gamma conversion unit 21 (S2).
  • the BL data calculation unit 22 calculates the outputs (LED lighting rates) of the plurality of light emitting regions 36 based on the video signal gamma-converted by the gamma conversion unit 21, and generates BL data indicating the outputs. (S3).
  • the BL data calculation unit 22 outputs the generated BL data to the luminance distribution calculation unit 23 and the BL control unit 27.
  • the brightness distribution calculation unit 23 calculates the brightness of the illumination light (brightness distribution of BL 33) from the plurality of light emitting regions 36 to be irradiated to each of the plurality of pixels 35 based on the BL data and the PSF (S4). (Brightness distribution calculation process).
  • the luminance distribution calculation unit 23 outputs data indicating the luminance distribution to the correction coefficient calculation unit 24.
  • the correction coefficient calculation unit 24 calculates a correction coefficient, which is a relative value for the brightness of the illumination light calculated by the brightness distribution calculation unit 23, for the pixel of interest (correction coefficient calculation step).
  • the correction coefficient calculation unit 24 performs this process on all the pixels 35 included in the display panel 31 (S5).
  • the correction coefficient calculation unit 24 outputs the calculated correction coefficient of each pixel 35 to the video signal correction unit 25.
  • the video signal correction unit 25 When the video signal correction unit 25 receives the correction coefficient from the correction coefficient calculation unit 24, the video signal correction unit 25 corrects the gradation value of each pixel 35 indicated by the gamma-converted video signal by using the correction coefficient corresponding to the pixel 35 ( S6) (Video signal correction step).
  • the video signal correction unit 25 generates a final video signal by referring to the information of the video signal converted to the reverse gamma by the reverse gamma conversion unit 26, and displays the display panel drive unit 32 as liquid crystal data indicating the liquid crystal transmittance. Output to.
  • the display panel drive unit 32 drives the display panel 31 with the output value indicated by the liquid crystal data generated by the video signal correction unit 25 (S7).
  • the BL control unit 27 controls the drive of the BL 33 by outputting the BL data generated by the BL data calculation unit 22 to the BL drive unit 34 (S8). By these drive controls, the input image is displayed on the display panel 31.
  • FIG. 5A and 5B are diagrams for explaining the effect of the display device 1
  • FIG. 5A is a graph showing the gradation value of the input video signal
  • FIG. 5B is a graph showing the gradation value of the input video signal according to the gradation value of the input video signal. It is a graph which shows the luminance distribution of the light emitting region 36 which emitted light
  • (c) is a graph which shows the liquid crystal transmittance after correction by a video signal correction part 25
  • (d) is a graph which shows display brightness in display part 3. is there.
  • each of the five horizontally arranged light emitting regions 36 is a gradation value (transmittance conversion) of the input video signal shown in FIG. 5A (FIG. 5). It is assumed that light is emitted according to the broken line 56) in (b) of 5. In this case, the actual luminance distribution is as shown by the solid line 57 in FIG. 5B. This is because the light emitting area 36 emits light so as to realize the maximum gradation value among the plurality of pixels 35 included in the corresponding divided display area.
  • the correction coefficient calculation unit 24 calculates the relative value of the brightness of the illumination light for each pixel 35 when the maximum brightness of the illumination light applied to the pixel of interest is 1 when the light emitting region 36 is lit by itself. To do.
  • the video signal correction unit 25 divides the gradation value of each pixel 35 included in the video signal by the relative value (correction coefficient).
  • the liquid crystal transmittance becomes as shown in the graph shown in FIG. 5 (c). Since the actual display luminance in the display unit 3 is the product of the solid line 57 shown in FIG. 5 (b) and the liquid crystal transmittance, the input gradation indicated by the input video signal is shown in FIG. 5 (d). The same display brightness as the value can be realized.
  • the gradation value of the pixel 35 can be appropriately corrected. As a result, an image having high fidelity to the input video signal can be displayed regardless of the number of lit light emitting regions 36 among the plurality of light emitting regions 36.
  • FIG. 6 is a diagram showing a state in which a solid image of 100% white on the entire surface is displayed on the display unit 3.
  • FIG. 7 shows the input video signal between A and B in FIG. 6 converted into transmittance (displayed as “input”), the luminance distribution of BL33 (displayed as “BL luminance distribution”), and the corrected liquid crystal transmittance. It is a figure which showed the actual display luminance in order in the display part 3. For convenience, it is assumed that the number of light emitting regions 36 between A and B is 5, and one light emitting region 36 includes 20 pixels 35.
  • FIG. 8 is a diagram showing a state in which a 100% white window on a 0% black background is displayed at a position slightly smaller than the size of the light emitting area 36 and shifted to the right side of the drawing from the center of the light emitting area 36.
  • FIG. 9 is a diagram showing the luminance distribution of BL33 in the state of FIG. In BL33, the light emitting area 36 corresponding to the white window and the light emitting area 36 around the light emitting area 36 are lit.
  • FIG. 10 shows a value obtained by converting the input signal between A and B in FIG. 8 into transmittance (displayed as “input”), the luminance distribution of BL33 (displayed as “BL luminance distribution”), and after correction by the video signal correction unit 25.
  • the liquid crystal transmittance of the above and the actual display brightness in the display unit 3 are shown in order. As in the case of FIG. 6, it is assumed that five light emitting regions 36 are included between A and B, and that one light emitting region 36 includes 20 pixels 35.
  • the image indicated by the input video signal has a window slightly to the right of the center of the central light emitting area 36 (referred to as the central area).
  • the central area is 100%
  • the light emitting area 36 on the right side of the central area is 80%
  • the light emitting area 36 on the left side of the central area is 50%
  • the other light emitting areas 36 are 0%. Since the brightness of the pixel 35 corresponding to the central area becomes larger than 1 when shining in this way, the desired brightness can be realized by lowering the gradation of the pixel 35 whose brightness becomes larger than 1.
  • FIG. 11A is a diagram showing the brightness of the window when the small window 61 is displayed on the conventional display device 300
  • FIG. 11B is a diagram showing the small window 62 on the display device 1. It is a figure which shows the brightness of the said window at the time.
  • the liquid crystal data is corrected with the maximum brightness when a completely white image is input, that is, when the LED emits light at the maximum emission intensity over the entire emission region. Is done.
  • the light emitting area is reduced, so that the backlight becomes dark and the displayed brightness becomes small. Therefore, the window 61 is displayed in gray.
  • the image can be displayed with the same brightness regardless of whether the white image is displayed on the entire surface or a small window is displayed. That is, in the example shown in FIG. 11B, the window 62 is displayed in white.
  • the brightness does not change regardless of the size of the window, but the backlight always emits light on the entire surface, so that the power consumption is large.
  • the power consumption it is necessary to lower the brightness, but in the display device 1, the power consumption can be suppressed and the contrast can be increased by local dimming.
  • FIG. 12 is a block diagram showing the configuration of the display device 1A according to the present embodiment. As shown in FIG. 12, the display device 1A of the present embodiment includes a BL power correction unit (power correction unit) 28 in addition to the configuration of the display device 1.
  • BL power correction unit power correction unit
  • the BL power correction unit 28 receives the BL data and calculates the total power consumption of the BL 33 from the outputs of the plurality of light emitting regions 36 calculated by the BL data calculation unit 22. Further, when the calculated power consumption exceeds a predetermined value, the BL power correction unit 28 reduces the output of at least a part of the light emitting region 36 in the BL data so that the power consumption does not exceed the predetermined value. ..
  • the BL power correction unit 28 reduces the output value of each light emitting region 36 in the BL data at a uniform rate or as the output value increases so that the power consumption of the BL 33 becomes equal to or less than the predetermined value. To lower it.
  • the mode for reducing the output value of the light emitting region 36 is not particularly limited.
  • the predetermined value of power consumption is, for example, the illumination from the light emitting region 36 when the brightness of each pixel 35 is the maximum brightness, that is, when only one of the light emitting regions 36 is lit in a state where the BL 33 is entirely lit.
  • the power consumption does not exceed the maximum value of the brightness of the illumination light in the pixel 35 that receives the light.
  • the predetermined value may be appropriately set according to the specifications of the display device 1A, and is not particularly limited.
  • the luminance distribution calculation unit 23 illuminates each of the plurality of pixels 35 based on the BL data output from the BL data calculation unit 22 from the plurality of light emitting regions 36.
  • the brightness of the light may be calculated.
  • the brightness distribution calculation unit 23 may receive the corrected BL data output from the BL power correction unit 28 and calculate the brightness of the illumination light.
  • FIG. 13 is a flowchart showing an example of the processing flow in the display device 1A.
  • each step of S11 to S17 is the same as each step of S1 to S7 shown in FIG.
  • the BL data calculation unit 22 generates BL data based on the video signal gamma-converted by the gamma conversion unit 21 (S13).
  • the BL data calculation unit 22 outputs the generated BL data to the luminance distribution calculation unit 23 and the BL power correction unit 28.
  • the BL power correction unit 28 calculates the total power consumption of the BL 33 from the outputs of the plurality of light emitting regions 36 indicated by the BL data (S18).
  • the BL power correction unit 28 covers at least a part of the light emitting region 36 in the BL data so that the power consumption does not exceed the predetermined value.
  • the output is reduced (S20). Further, the BL power correction unit 28 outputs the corrected BL data to the BL control unit 27.
  • the BL power correction unit 28 outputs the BL data to the BL control unit 27 without correcting it.
  • the BL control unit 27 controls the drive of the BL 33 by outputting the BL data received from the BL power correction unit 28 to the BL drive unit 34 (S21).
  • the BL power correction unit 28 consumes the power.
  • BL data is corrected so that is equal to or less than a predetermined value.
  • FIG. 8 in the state where only a small window is displayed, the power consumption of the BL 33 does not exceed a predetermined value, so that the BL power correction unit 28 does not correct the BL data. Therefore, it is possible to display an image having high fidelity to the input video signal while suppressing the power consumption within a predetermined range.
  • FIG. 14 is a block diagram showing the configuration of the display device 1B according to the present embodiment.
  • the display device 1B of the present embodiment includes a BL data correction unit (light source data correction unit) 29 in addition to the configuration of the display device 1.
  • BL data correction unit light source data correction unit
  • the correction coefficient calculation unit 24 Since the correction coefficient calculation unit 24 is not an indispensable component in the display device 1B, the correction coefficient calculation unit 24 may be omitted. In this case, the video signal correction unit 25 does not correct the gradation value using the correction coefficient, and similarly to the conventional case, the video signal correction unit 25 calculates the gradation value of the video signal based on the luminance distribution calculated by the luminance distribution calculation unit 23. It should be corrected.
  • the maximum amount of illumination light emitted to the pixel of interest is the maximum.
  • the brightness is called the maximum brightness.
  • the light emitting area 36 (central light emitting area) corresponding to the pixel of interest and the light emitting area 36 around the light emitting area 36 are lit. It means to light up.
  • the light emitting region 36 preset as the peripheral light emitting region may be a light emitting region 36 located around the central light emitting region (up / down, left / right, diagonal direction), and the light emitting region 36 surrounding the outer side thereof may be peripherally emitted. It may be included in the area.
  • the peripheral light emitting region may be set in consideration of, for example, the size or distribution shape of the light emitting points of the light emitting region 36 based on PSF.
  • the central light emitting region and the peripheral light emitting region are, for example, 5 ⁇ 5 light emitting regions 36.
  • the brightness distribution calculation unit 23 calculates the brightness of the illumination light from the plurality of light emitting regions 36 to be irradiated to each of the plurality of pixels 35.
  • the BL data correction unit 29 makes the brightness of the illumination light equal to or less than the maximum brightness when there is a pixel 35 (attention pixel) whose brightness of the illumination light calculated by the brightness distribution calculation unit 23 is larger than the maximum brightness.
  • the output of the partial light emitting region 36 that is, the central light emitting region and the peripheral light emitting region
  • the BL data correction unit 29 makes the brightness of the illumination light equal to or less than the maximum brightness when there is a pixel 35 whose brightness of the illumination light calculated by the brightness distribution calculation unit 23 is larger than the maximum brightness.
  • BL data is corrected for the part of the light emitting region 36.
  • the BL data correction unit 29 calculates the relative value of the brightness of the illumination light of the pixel of interest when the maximum brightness is 1, and divides the output value of the part of the light emitting region 36 by the relative value. To do.
  • the method for correcting BL data in the BL data correction unit 29 is not limited to this method, and any method may be used as long as the brightness of the illumination light of the pixel of interest is equal to or less than the maximum brightness.
  • FIG. 15 is a flowchart showing an example of the processing flow in the display device 1B.
  • each step of S31 to S33 is the same as each step of S1 to S3 shown in FIG.
  • the luminance distribution calculation unit 23 calculates the luminance distribution of BL33 based on the BL data and the PSF, as in the process in step S4 (S34).
  • the brightness distribution calculation unit 23 outputs data indicating the brightness distribution to the BL data correction unit 29.
  • the BL data correction unit 29 determines whether or not the brightness of the illumination light of each pixel 35 is the maximum brightness "1" or less. When the brightness of the attention pixel is not “1" or less (NO in S35), the BL data correction unit 29 performs the center corresponding to the attention pixel so that the brightness of the illumination light becomes the maximum brightness "1" or less. BL data is corrected in order to reduce the output of the light emitting region and the peripheral light emitting region (S36) (light source data correction step). The BL data correction unit 29 outputs the corrected BL data to the luminance distribution calculation unit 23, and performs the processes of steps S34 and S35 again.
  • the BL data correction unit 29 performs the correction coefficient calculation unit 24 and the BL control without correcting the BL data. Output to unit 27.
  • step S40 the BL control unit 27 acquires BL data from the BL data correction unit 29.
  • the BL data correction unit 29 makes the illumination light brightness of the pixel 35 equal to or less than the maximum brightness. As described above, the output of the central light emitting region corresponding to the pixel 35 and the light emitting region around the central light emitting region is reduced.
  • the power consumption of the display device 1B can be made lower than that of the display device 1.
  • Control blocks of display devices 1, 1A, 1B (particularly, BL data calculation unit 22, brightness distribution calculation unit 23, correction coefficient calculation unit 24, video signal correction unit 25, BL control unit 27, BL power correction unit 28, and BL data.
  • the correction unit 29 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 devices 1, 1A, and 1B include a computer that executes a program instruction, which is software that realizes each function.
  • the computer includes, for example, at least one processor (control device) and at least one computer-readable recording medium that stores the program. Then, in the computer, the processor reads the program from the recording medium and executes it, thereby achieving the object of the present disclosure.
  • the processor for example, a CPU (Central Processing Unit) can be used.
  • the recording medium in addition to a “non-temporary tangible medium” such as a ROM (Read Only Memory), a tape, a disk, a card, a semiconductor memory, a programmable logic circuit, or the like can be used.
  • a RAM RandomAccessMemory
  • the program may be supplied to the computer via an arbitrary transmission medium (communication network, broadcast wave, etc.) capable of transmitting the program.
  • a transmission medium communication network, broadcast wave, etc.
  • one aspect of the present disclosure can also be realized in the form of a data signal embedded in a carrier wave, in which the above program is embodied by electronic transmission.
  • the main control unit 2 which is the control device of the display devices 1, 1A, and 1B according to each aspect of the present disclosure may be realized by a computer.
  • each unit in this case, including the computer.
  • a control program of a display device that realizes the main control unit 2 on a computer by operating as a software element) and a computer-readable recording medium that records the control program are also included in the scope of the present disclosure.

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  • Chemical & Material Sciences (AREA)
  • Nonlinear Science (AREA)
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  • Optics & Photonics (AREA)
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Abstract

La présente invention concerne un dispositif d'affichage d'image qui comprend : un panneau d'affichage doté d'une zone d'affichage dans laquelle une pluralité de pixels sont agencés et qui affiche une image sur la base d'un signal vidéo d'entrée ; une pluralité de sources de lumière qui éclairent la pluralité de pixels dans la zone d'affichage et qui peuvent être activées indépendamment ; une unité de calcul de distribution de luminosité qui calcule la luminosité de la lumière d'éclairage qui est émise par la pluralité de sources de lumière et avec laquelle chaque pixel de la pluralité de pixels est irradié ; une unité de calcul de coefficient de correction qui calcule une valeur relative pour la luminosité calculée par l'unité de calcul de distribution de luminosité en prenant pour acquis que la luminosité maximale de la lumière d'éclairage avec laquelle un pixel d'intérêt est irradié lorsqu'une seule de la pluralité de sources de lumière correspondant au pixel d'intérêt est activée est réglée à 1 ; et une unité de correction de signal vidéo qui divise une valeur de gradation du pixel d'intérêt basée sur le signal vidéo d'entrée par la valeur relative.
PCT/JP2020/009544 2019-05-17 2020-03-06 Dispositif d'afichage d'image et procédé de commande pour dispositif d'affichage d'image WO2020235177A1 (fr)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011227143A (ja) * 2010-04-15 2011-11-10 Sanyo Electric Co Ltd 表示装置
JP2013225110A (ja) * 2012-03-22 2013-10-31 Canon Inc 光源制御装置およびその制御方法、液晶表示装置
JP2018036505A (ja) * 2016-08-31 2018-03-08 株式会社ジャパンディスプレイ 表示装置、電子機器及び表示装置の駆動方法
WO2018110056A1 (fr) * 2016-12-14 2018-06-21 シャープ株式会社 Dispositif de commande de source de lumière, dispositif d'affichage, dispositif de traitement d'image, procédé de commande de dispositif de commande de source lumineuse et programme de commande
US20180277046A1 (en) * 2017-03-24 2018-09-27 John Lang Display backlight brightness adjustment
JP2018194567A (ja) * 2017-05-12 2018-12-06 キヤノン株式会社 発光装置、表示装置、及び、発光装置の制御方法

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011227143A (ja) * 2010-04-15 2011-11-10 Sanyo Electric Co Ltd 表示装置
JP2013225110A (ja) * 2012-03-22 2013-10-31 Canon Inc 光源制御装置およびその制御方法、液晶表示装置
JP2018036505A (ja) * 2016-08-31 2018-03-08 株式会社ジャパンディスプレイ 表示装置、電子機器及び表示装置の駆動方法
WO2018110056A1 (fr) * 2016-12-14 2018-06-21 シャープ株式会社 Dispositif de commande de source de lumière, dispositif d'affichage, dispositif de traitement d'image, procédé de commande de dispositif de commande de source lumineuse et programme de commande
US20180277046A1 (en) * 2017-03-24 2018-09-27 John Lang Display backlight brightness adjustment
JP2018194567A (ja) * 2017-05-12 2018-12-06 キヤノン株式会社 発光装置、表示装置、及び、発光装置の制御方法

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