WO2011080875A1 - Dispositif et procédé d'affichage - Google Patents

Dispositif et procédé d'affichage Download PDF

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Publication number
WO2011080875A1
WO2011080875A1 PCT/JP2010/007018 JP2010007018W WO2011080875A1 WO 2011080875 A1 WO2011080875 A1 WO 2011080875A1 JP 2010007018 W JP2010007018 W JP 2010007018W WO 2011080875 A1 WO2011080875 A1 WO 2011080875A1
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WIPO (PCT)
Prior art keywords
color component
color
light source
light
unit
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PCT/JP2010/007018
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English (en)
Japanese (ja)
Inventor
敦士 中西
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パナソニック株式会社
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Publication of WO2011080875A1 publication Critical patent/WO2011080875A1/fr

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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
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133601—Illuminating devices for spatial active dimming
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133603—Direct backlight with LEDs
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133624—Illuminating devices characterised by their spectral emissions
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G09G2320/0646—Modulation of illumination source brightness and image signal correlated to each other

Definitions

  • the present invention relates to a display device and a display method using a backlight.
  • a liquid crystal display device using a liquid crystal display element (liquid crystal panel) as a light modulation element includes an illumination light source on the back surface, and displays an arbitrary image by controlling the transmittance of light emitted from the light source by the liquid crystal panel. Is realized.
  • the display screen is divided into a plurality of divided areas for the purpose of expanding the dynamic range of display luminance and reducing power consumption, and at least one light source is arranged for each area.
  • the display luminance in each divided area is detected and the emission luminance of each light source is divided in order to improve image quality while reducing power consumption.
  • the emission luminance of each light source is divided in order to improve image quality while reducing power consumption.
  • the display brightness range of the image display device is expanded to an ideal range, and a plurality of areas are supported for the purpose of ensuring image quality.
  • Luminance distribution calculating means for calculating the luminance distribution of the image signal and determining the brightness of the illumination light for each area, and illumination control for controlling the illumination light for each area of the illuminating means based on the determination of the luminance distribution calculating means
  • a configuration employing the means is known (for example, Patent Document 2).
  • Patent Document 1 and Patent Document 2 described above control the light emission luminance of each light source with respect to the input video signal, and the color emitted by each light source in order to further reduce power consumption. There are no studies on the control of ingredients.
  • the present invention focuses on the color components emitted by each light source that has not been studied in the past, and a display device that can provide video with appropriate image quality while reducing power consumption.
  • a display method is provided.
  • a display device includes a display panel that is conceptually divided into a plurality of divided regions each including a plurality of pixels and that displays an image corresponding to an input video signal, and each of the display panels includes the display panel.
  • a plurality of light sources arranged corresponding to each divided region, each configured to be able to irradiate a plurality of colors of light onto the display panel from the back, and for each of the divided regions irradiated with light from each of the light sources.
  • a detection unit for detecting a first color component based on the video signal, and a light source arranged corresponding to the divided region based on the first color component detected for each of the divided regions by the detection unit.
  • Determining the second color component for each of the divided regions as the color of the light to be irradiated, and the color of the video signal according to the second color component determined by the determination unit Included in divided area A correction unit that corrects the color of the third color component for each of the pixels, the light source is driven so that the light of the second color component is emitted from the light source, and the video signal is output by the correction unit. Is substantially the same as the first color component for each of the divided areas, and the determination unit converts the video signal to the third color component for each of the pixels.
  • the color that reduces the power consumption of the light source is determined as the second color component as compared with the power consumption of the light source when the color component is displayed on the display panel without color correction.
  • a display method includes a display panel that is conceptually divided into a plurality of divided regions each including a plurality of pixels, and displays a video corresponding to an input video signal,
  • a display method used for a display device that is arranged corresponding to each of the divided areas of the panel, and each includes a plurality of light sources configured to be able to irradiate light of a plurality of colors from the back to the display panel,
  • FIG. 1 is a diagram showing a configuration of a display device according to a first embodiment of the present invention.
  • FIG. 6 shows a configuration of a display device according to Embodiment 3 of the present invention.
  • FIG. 10 is a diagram illustrating another example of color component interpolation processing according to the third embodiment of the present invention.
  • the display device according to the first embodiment of the present invention includes a display panel 100, a panel drive control unit 102, a backlight unit 104, a backlight drive control unit 106, an in-region feature amount detection unit 108, and a determination.
  • the display panel 100 is conceptually divided into a plurality of divided areas and displays a video corresponding to the input video signal.
  • the panel drive control unit 102 controls the drive of the display panel 100.
  • the backlight unit 104 is installed on the back surface of the display panel 100, and includes a light source 105 (for example, an LED in this embodiment) corresponding to each of the divided areas.
  • the backlight drive control unit 106 controls the drive of the backlight unit 104 and drives the backlight unit 104 for each of the divided areas.
  • the in-region feature amount detection unit 108 detects the first color component in the target divided region from the input video signal.
  • the determination unit 110 determines a second color component to be output from the light source 105 of the backlight unit 104 from the first color component detected by the in-region feature amount detection unit 108.
  • the signal correction unit 112 performs color correction on the color component of the input video signal according to the second color component determined by the determination unit 110.
  • the display panel 100 includes a plurality of gate lines, a plurality of source lines, a switching element, and a plurality of pixel cells, and a plurality of pixels in a matrix at intersections of the plurality of source lines and the plurality of gate lines. Are arranged, and one scanning line is constituted by one line of pixels in the horizontal direction.
  • a plurality of source lines are supplied with pixel signals from the panel drive control unit 102, and a plurality of gate lines are supplied with gate pulses as scanning signals from the panel drive control unit 102, and a signal voltage is applied to the liquid crystal layer corresponding to each pixel. Is given to control the transmittance.
  • the display panel 100 is conceptually divided into a plurality of divided regions. Each divided region of the display panel 100 is configured to include a plurality of pixels.
  • the display panel 100 may be any method such as a VA (Vertical Alignment) method or a UV2A (Ultraviolet induced multi-domain Vertical Alignment) method that irradiates liquid crystal molecules with ultraviolet rays. Is applicable.
  • VA Vertical Alignment
  • UV2A Ultraviolet induced multi-domain Vertical Alignment
  • the present invention can be applied to the display panel 100 as long as it is not only a liquid crystal panel but also a panel that requires a backlight unit.
  • the concept of dividing the display panel 100 into divided areas is not that the display panel 100 is actually divided, but each divided area of the display panel 100 corresponds to each light source 105 of the backlight unit 104. This means that it is virtually divided.
  • the backlight unit 104 has a function of irradiating illumination light for displaying an image on the display panel 100 from the back side. As with the display panel 100, the backlight unit 104 is divided into a plurality of divided regions. Each target area (each divided area) illuminates the target area (divided area) at the same position on the display panel 100. Each target area (each divided area) has at least one light source 105. In other words, the backlight unit 104 includes a light source 105 arranged in each divided area, and each light source 105 irradiates light to a corresponding divided area of the display panel 100.
  • the light source 105 emits light of four or more colors, such as a single white LED, two yellow LEDs and blue LEDs, and three R, G, and B LEDs, that is, a red LED, a green LED, and a blue LED. Any of the configurations including four or more types of LEDs can be employed. That is, each light source 105 is configured to be able to irradiate light of a plurality of colors. In the first embodiment, for example, the light source 105 includes a red LED, a green LED, and a blue LED.
  • the LED belonging to each target area is driven by the backlight drive control unit 106.
  • the color component for each target region that is, the color of light emitted from the light source 105 arranged in each divided region to the display panel 100 is based on the second color component determined by the determination unit 110 described in detail later.
  • the backlight drive control unit 106 drives each independently. That is, the backlight drive control unit 106 generates a drive signal for each light source 105 so that the color of the light emitted from the light source 105 approaches the second color component.
  • each target area (each divided area) is connected to the backlight drive control unit 106 by a control line.
  • a configuration is adopted in which light emitted from the LEDs of the backlight unit 104 is made uniform by providing a diffusion sheet between the display panel 100 and the backlight unit 104. It is also possible to do.
  • the in-region feature amount detection unit 108 detects the feature amount of the first color component in the region for the video signal in each region divided in the display panel 100 described above. Specifically, it is possible to detect feature amounts relating to various color components such as an average color component in each divided region, a maximum value for each RGB in each divided region, and a maximum value of a color difference from white. . In addition, the in-region feature quantity detection unit 108 can be applied to video signals in various formats such as RGB and YUV.
  • the in-region feature amount detection unit 108 can output the color components of each divided region to the determination unit 110 described later. That is, the in-region feature amount detection unit 108 detects the first color component for each divided region based on the input video signal. In addition, the in-region feature amount detection unit 108 notifies the determination unit 110 of the detected first color component.
  • the determination unit 110 the second color component emitted by the LED in the backlight unit 104 is determined based on the first color component output from the in-region feature amount detection unit 108.
  • the power consumption of the LED of the backlight unit 104 can be reduced compared to the first color component of the video signal to which the LED of the backlight unit 104 is input. 2 color components.
  • the determination unit 110 uses the second color component of the light to be emitted from the backlight unit 104 for each divided region based on the first color component detected by the in-region feature amount detection unit 108. Determine the color component.
  • the determination unit 110 compares the power consumption of the light source 105 of the backlight unit 104 with the power consumption of the light source 105 of the backlight unit 104 when the input video signal is displayed on the display panel 100 as it is. Is determined as the second color component.
  • the configuration of the signal correction unit 112 will be described.
  • the color component of the input video signal is corrected according to the second color component emitted by the LED of the backlight unit 104 determined by the determination unit 110, and the first color component is corrected. Is corrected to the third color component.
  • the second color component emitted from the LED of the backlight unit 104 determined by the determination unit 110, and the third color component color-corrected by the signal correction unit 112, Are combined, the third color component is determined for each of R, G, and B so as to substantially match the first color component detected by the in-region feature quantity detection unit 108.
  • each light source 105 is driven by the backlight drive control unit 106 so that the light of the second color component determined by the determination unit 110 is emitted from the light source 105 of the backlight unit 104, and the inputted video
  • the third color component is divided into regions so as to substantially match the first color component. It is determined for each pixel.
  • Specific correction methods include a method of applying gain to the first color component of the input video signal, a method of performing gamma correction, and the like, and the specific method is limited to these. is not.
  • FIG. 2A conceptually shows processing in a display device that emits normal white light from a backlight unit as a comparative example
  • FIG. 2B shows the first embodiment of the present invention. The process in a display apparatus is shown notionally.
  • FIGS. 2A and 2B show signal levels for R, G, and B of the video signal output from the display panel 100 when displaying the skin color
  • FIGS. ) Shows the backlight level for each of R, G, and B output from the backlight unit 104 when displaying the skin color
  • the right diagrams in FIGS. 2 (A) and 2 (B) show the skin color.
  • the signal levels for R, G, and B that are output to the user as a display device that is the sum of the output from the display panel 100 and the output from the backlight unit 104 when displaying are shown. That is, the right diagrams in FIGS. 2A and 2B show the signal level of the video displayed on the display panel 100.
  • the present invention of FIG. 2B is implemented even in the case of the display device of the comparative example of FIG. Even in the case of the display device according to the first aspect, it is possible to output the same skin color video signal in any case.
  • the backlight level can be reduced in the case of FIG. 2B as compared with the case of FIG. 2A, and thereby the power consumption of each light source. Can be reduced. Further, by correcting the video signal at the same time, it becomes possible to express a color faithful to the input video signal.
  • FIG. 3 shows the case where the backlight unit 104 displays white (left figure), the backlight unit 104 displays red (right figure), and the backlight unit 104 displays an intermediate color between white and red.
  • the signal level of the backlight for each of R, G, and B in the case of being in the middle (center diagram) is displayed, and the level of power consumption is shown.
  • the determination unit 110 determines the second color component that is as far as possible from white as the first color component detected by the in-region feature amount detection unit 108.
  • the second determined by the determination unit 110 is used.
  • the second color component determined by the determination unit 110 is combined with the third color component corrected by the signal correction unit 112 described above.
  • the consumption of the light source of the backlight unit 104 is compared with the first color component detected by the in-region feature quantity detection unit 108 in the range in which the first color component detected by the in-area feature quantity detection unit 108 can be displayed. It is necessary to set to a value that reduces power.
  • the determination unit 110 drives the light source 105 so that the light of the second color component is emitted from the light source 105 of the backlight unit 104, and the input video signal is converted into the third color component by the signal correction unit 112.
  • the backlight has a color in a range that substantially matches the first color component and the input video signal is displayed on the display panel 100 as it is.
  • the color for which the power consumption of the light source 105 of the backlight unit 104 is reduced as compared with the power consumption of the light source 105 of the unit 104 is determined as the second color component.
  • the light source 105 is driven so that the light of the second color component is emitted from the light source 105 of the backlight unit 104, and the input video signal is color-corrected to the third color component by the signal correction unit 112 and displayed.
  • the fact that it substantially matches the first color component means that the video displayed on the display panel 100 substantially matches the video corresponding to the input video signal. means.
  • substantially match includes complete match. For example, a difference of about one digit in 8-bit data may be handled as matching. Further, “substantially coincidence” may include, for example, a slight error of about 5% (12 to 13) in 8-bit data.
  • Specific processing of the determination unit 110 includes a method of setting the average color of the target region as the color of the light source 105 of the backlight unit 104, and the maximum value for each of R, G, and B of the target region.
  • a method of setting the color of the light source 105 is conceivable. That is, the determination unit 110 may determine an average color obtained by averaging the colors of the pixels in the divided area as the second color component. Alternatively, the determination unit 110 determines, as the second color component, a color including the maximum value of the red component, the maximum value of the green component, and the maximum value of the blue component in each pixel as the maximum value of the specific color in the divided region. May be.
  • the power consumption can be reduced as the average color of the target area is farther from white, while the average When the opposite color is in the target area, it is difficult to display the color appropriately.
  • a signal level in which the color component is biased to any one of R, G, and B as shown in the right diagram of FIG. 3 represents the average color of the divided areas.
  • the signal level is determined by the determination unit 110 as the second color component and the light source 105 of the backlight unit 104 is controlled as the color of the light emitted from the light source 105 of the backlight unit 104, as described above.
  • power consumption can be greatly reduced.
  • a pixel having a color opposite to the signal level as shown in the right diagram of FIG. 3, that is, a pixel having a cyan color is present in this divided region, even if the signal correction unit 112 performs color correction, the cyan It is difficult to reproduce the colors of the system.
  • the signal correction unit 112 described above is used even when the opposite color is in the target area.
  • the correct color can be displayed by the color correction in. That is, the color consisting of the maximum value of the red component, the maximum value of the green component, and the maximum value of the blue component in each pixel included in the divided region is determined by the determination unit 110 as the second color component, and the backlight unit 104
  • the light source 105 of the backlight unit 104 may be controlled as the color of light emitted from the light source 105. In this case, even if the pixel having the opposite color of the second color component is included in the divided area, the opposite color can be reproduced. Therefore, the input video signal can be faithfully reproduced.
  • the backlight drive control unit 106 starts from the state shown in the left diagram of FIG.
  • the light source 105 of the backlight unit 104 is controlled so as to move to the state shown in the figure. That is, the second color component determined by the determination unit 110 is such that the light amount of at least one light source (G, B light source in FIG. 3) of the R, G, B light sources is reduced and the light amount is Combining the light emitted from each of the R, G, and B light sources when the respective light amounts of the R, G, and B light sources are set so as not to increase the light amounts of the light sources other than the light source that decreases (the R light source in FIG. 3).
  • the color is equal to the color.
  • the determination unit 110 does not determine the combined color obtained by increasing the light amount of any one of the R, G, and B light sources as the second color component. This is the same in the second and third embodiments described later.
  • FIG. 4 conceptually shows the processing of the signal correction unit 112
  • FIG. 5 shows a backlight when applying gain to an input video signal, which is an example of processing of the signal correction unit 112.
  • the relationship between the light emission value of the light source of the unit 104 and the value of a gain is shown.
  • FIG. 4A shows R, G, and B values output from the backlight unit 104 based on the second color component determined by the determination unit 110 described above.
  • FIG. 4B applies to the video signal input by the signal correction unit 112 when the backlight unit 104 outputs the values of R, G, and B shown in FIG. The gain values are shown for each of R, G, and B.
  • FIG. 4C shows R, G, and B values of the video signal input to the display device and input to the signal correction unit 112.
  • FIG. 4 (D) shows a case where FIG. 4 (B) and FIG. 4 (C) are multiplied, that is, R, G, B values obtained by applying gain to the input video signal. Show. This is an R, G, B signal having the third color component output from the signal correction unit 112, and a drive signal for driving the display panel 100 is generated in the panel drive control unit 102 based on this value. It becomes.
  • the backlight unit 104 outputs the R, G, B signals having the levels shown in FIG. 4A, and the signal correction unit 112 converts the input video signal into the third color component shown in FIG. 4D.
  • the signal correction unit 112 converts the input video signal into the third color component shown in FIG. 4D.
  • the signal correction unit 112 can employ various methods such as a configuration including FIG. 5 as a lookup table and a method of calculating FIG.
  • the gain characteristics shown in FIG. 5 are set for each of R, G, and B. That is, when the light source 105 of the backlight unit 104 emits light with reduced G component and B component as shown in FIG. 4A instead of white light as shown in the left diagram of FIG. Therefore, it is necessary to correct the input video signal so that the G component and the B component are increased by an amount corresponding to the decrease in the G component and the B component. Therefore, the signal correction unit 112 applies a correction gain as shown in FIG. 4B to the input video signal so that the G component and the B component are compared with the input video signal as shown in FIG. An increased output video signal is generated. Therefore, the signal correction unit 112 sets a set of correction gains set for each of R, G, and B for each light source 105 of the backlight unit 104, that is, for each divided region.
  • the present invention As a signal correction method in the signal correction unit 112, in the present embodiment, a method of applying gain to an input video signal has been described. However, the present invention is not limited to this, and for example, It is also possible to correct an input video signal by a method such as changing a gamma curve when performing gamma correction.
  • the input video signal is reduced while reducing the power consumption by changing the color of each light source 105 of the backlight unit 104 to the second color component.
  • the color of the input video signal and the color of the video signal output from the display panel 100 can be substantially matched.
  • a table 150 stored in a memory may be provided.
  • the table 150 includes a second color component output from each light source 105 of the backlight unit 104 and a signal correction unit for each color component with respect to the first color component detected by the in-region feature amount detection unit 108.
  • 112 is a table in which a third color component to be output after color correction of an input video signal is set. Based on the second color component and the third color component set in the table 150, the determination unit 110 determines the second color component, and the signal correction unit 112 determines the color of the third color component. It is also possible to employ a configuration for performing correction.
  • the color of the video signal input by the signal correction unit 112 is changed to the third color while the power consumption is reduced by changing the color of each light source 105 of the backlight unit 104 to the second color component.
  • the color of the input video signal and the color of the video signal output from the display panel 100 can be substantially matched.
  • signal processing in the determination unit 110 and the signal correction unit 112 of the display device can be easily performed in a shorter time.
  • the determination unit 110 determines the second color component to be output from the LED of the backlight unit 104 from the first color component detected by the in-region feature amount detection unit 108, The content of the color correction of the color component of the input video signal to the third color component according to the second color component in the signal correction unit 112 has been described.
  • the second color component may not be expressed as it is in each light source 105 depending on the configuration of the backlight unit 104, and the processing in this case is shown in the second embodiment.
  • the display device according to the second embodiment of the present invention includes a display panel 100, a panel drive control unit 102, a backlight unit 104, an in-region feature quantity detection unit 108, a determination unit 110, a storage unit 160, A backlight drive control unit 200, an estimation unit 202, and a signal correction unit 204 are provided.
  • the display panel 100 is conceptually divided into a plurality of divided areas and displays a video corresponding to the input video signal.
  • the panel drive control unit 102 controls the drive of the display panel 100.
  • the backlight unit 104 is installed on the back surface of the display panel 100 and includes a plurality of light sources 105 (for example, LEDs in this embodiment), and the storage unit 160 stores information about the configuration of the backlight unit 104. That is, the storage unit 160 stores information related to light of a plurality of colors that can be emitted from the backlight unit 104.
  • the backlight unit 104 includes, as the light source 105, a configuration including three types of LEDs, a red (R) LED, a green (G) LED, and a blue (B) LED, and a yellow (Y) LED and a blue ( B) Either a configuration including two types of LEDs, a configuration including white (W) LEDs, or a configuration including four or more types of LEDs that emit light of four or more colors can be employed.
  • the storage unit 160 stores information on which configuration the backlight unit 104 employs.
  • the in-region feature amount detection unit 108 detects the first color component in the target divided region from the input video signal.
  • the determination unit 110 determines the second color component as the color of light to be emitted from the light source 105 of the backlight unit 104 from the first color component detected by the in-region feature amount detection unit 108.
  • the backlight drive control unit 200 sets the backlight unit 104 for each divided region.
  • a drive signal for driving the light source 105 is generated.
  • the estimation unit 202 estimates the fourth color component that is the color actually emitted from each light source 105 of the backlight unit 104 based on the drive signal generated by the backlight drive control unit 200.
  • the signal correction unit 204 corrects the color of the input video signal to the third color component.
  • each light source 105 constituting the backlight unit 104 is constituted by three color LEDs or constituted by two color LEDs.
  • the processing is changed depending on whether it is configured by a single color LED or by an LED having four or more colors.
  • the storage unit 160 stores information related to the configuration of the backlight unit 104, and the backlight drive control unit 200 determines that the light source 105 of the backlight unit 104 is based on the information stored in the storage unit 160.
  • a drive signal corresponding to the irradiable color is generated. This will be described in detail below.
  • FIG. 8A shows processing when the light source 105 constituting the backlight unit 104 is constituted by three colors of LEDs, for example, a red LED, a green LED, and a blue LED.
  • FIG. 8B shows a process in the case where the light source 105 constituting the backlight unit 104 is constituted by, for example, two-color LEDs of a yellow LED and a blue LED.
  • FIG. 8C shows processing when the light source 105 constituting the backlight unit 104 is composed of, for example, only white LEDs.
  • the backlight unit 104 can be configured by, for example, four-color LEDs of a red LED, a green LED, a blue LED, and a white LED.
  • the in-region feature amount detection unit 108 detects the first color component composed of R, G, and B color components from the input video signal, For the second color component consisting of R, G, B color information determined by the determination unit 110 based on the first color component, the value of the second color component is expressed as it is with three colors of LEDs. It becomes possible. That is, the light of the second color component can be emitted from the light source 105 of the backlight unit 104.
  • the light source 105 constituting the backlight unit 104 is constituted by two-color LEDs.
  • these two-color LEDs it is possible to express a color such as white using two-color LEDs, a blue LED and a yellow LED.
  • the yellow LED an LED capable of emitting yellow light by adding green phosphor and red light to the green LED is used.
  • the light emission luminance of the LED for each color it is possible to express arbitrary luminance or light emission only for the color obtained by mixing two colors.
  • the in-region feature amount detection unit 108 detects the first color component composed of R, G, and B color components from the input video signal, and this The backlight drive control unit 200 converts the second color component including the RGB color information determined by the determination unit 110 based on the first color component into the color components of the blue LED and the yellow LED. .
  • the two-color LEDs can only express a limited range of color components, so that the color component output from the backlight unit 104 and the second color component are the best. Conversion is performed so that the color components are close. That is, the backlight drive control unit 200 generates drive signals for driving the blue LED and the yellow LED so that the color of the light emitted from the backlight unit 104 is close to the second color component.
  • the backlight drive control unit 200 controls the color component according to the magnitude of the current (voltage) applied to the LED, and further controls the LED together with the lighting duty indicating the lighting period.
  • Light emission having an arbitrary luminance and color temperature is obtained. That is, the backlight drive control unit 200 controls the color temperature by changing the current level supplied to the LED, and adjusts the brightness by controlling the lighting duty when the brightness changes due to the change of the current level. To do.
  • the in-region feature quantity detection unit 108 detects the first color component composed of R, G, and B color components from the input video signal, and this first
  • the backlight drive control unit 200 converts the second color component composed of the R, G, and B color information determined by the determination unit 110 based on the one color component into the LED current value and duty value. Do.
  • the color component output from the backlight unit 104 and the second color component are as close as possible to each other. Further, the backlight drive control unit 200 performs conversion. In addition, the duty value is set low in a range that does not become too dark in consideration of luminance emitted from the light source. That is, the backlight drive control unit 200 generates a drive signal for driving the white LED so that the color of the light emitted from the backlight unit 104 becomes the color closest to the second color component.
  • the light source 105 constituting the backlight unit 104 is input by the processing of the backlight drive control unit 200 regardless of the configuration adopted. From the second color component of the video signal, a drive signal composed of an appropriate color component corresponding to the configuration of each light source 105 constituting the backlight unit 104 (that is, the color of light that can be emitted by the backlight unit 104) is generated. It will be possible.
  • the backlight drive control unit 200 generates a drive signal for driving the light source 105 based on the second color component determined by the determination unit 110 and the configuration of the light source 105 of the backlight unit 104.
  • the second color component may differ from the fourth color component, which is the color of light actually emitted from the light source 105.
  • the signal correction unit 204 needs to correct the difference between the second color component and the fourth color component.
  • the estimation unit 202 needs to estimate the fourth color component that is the color of light actually emitted from the light source 105. Details will be described below.
  • FIG. 9A corresponds to FIG. 8A described above, and the light source 105 constituting the backlight unit 104 is configured by, for example, LEDs of three colors, a red LED, a green LED, and a blue LED. It shows the processing when there is.
  • FIG. 9B corresponds to FIG. 8B described above, and the light source 105 constituting the backlight unit 104 is configured by, for example, two color LEDs, a yellow LED and a blue LED. Shows the process.
  • FIG. 9C corresponds to FIG. 8C described above, and shows processing when the light source 105 constituting the backlight unit 104 is composed of, for example, only white LEDs. .
  • the second color component (left diagram in FIG. 9A) determined by the determination unit 110 and the fourth color component actually output from the light source 105 of the backlight unit 104.
  • the center diagram in FIG. 9A matches the second color component, and the actual emission estimated value (the right diagram in FIG. 9A) is directly used. That is, the estimation unit 202 sets the second color component as the estimated value of the fourth color component based on the drive signals of the red LED, the green LED, and the blue LED generated by the backlight drive control unit 200.
  • the estimation part 202 calculates
  • the luminance for each of R, G, and B when the color is assumed to be composed of R, G, and B colors is estimated.
  • various methods such as a method of processing with a lookup table and a method of calculating an additive color mixture can be adopted.
  • the second color component shown in the left diagram in FIG. 9B and the right diagram in FIG. 9B As is apparent from the comparison between the left diagram in FIG. 9B and the right diagram in FIG. 9B, the second color component shown in the left diagram in FIG. 9B and the right diagram in FIG. 9B.
  • the estimated value of the fourth color component indicated by is that the color component is changed in each of R, G, and B. That is, the estimation unit 202 changes the red (R), green (G), and blue (B) colors based on the yellow (Y) LED and blue (B) LED drive signals generated by the backlight drive control unit 200.
  • the fourth color component is estimated based on the converted values of R, G, and B.
  • the estimation unit 202 obtains a color component obtained by light emission of the white LED.
  • the luminance for each of R, G, and B is estimated when it is assumed that the color is composed of R, G, and B colors. .
  • various methods such as a method of processing with a lookup table and a method of calculating an additive color mixture can be adopted.
  • the second color shown in the left diagram of FIG. 9C is obvious when comparing the left diagram of FIG. 9C and the right diagram of FIG. 9C.
  • the component and the estimated value of the fourth color component shown in the right diagram of FIG. 9C are changed in R, G, and B, respectively. That is, the estimation unit 202 converts red (R), green (G), and blue (B) based on the current value and duty generated by the backlight drive control unit 200, and converts the converted R, G, and B Based on the value, a fourth color component is estimated.
  • each light source 105 constituting the backlight unit 104 actual output from each light source 105 of each backlight unit 104 is provided. It is possible for the estimation unit 202 to estimate the fourth color component to be performed. Based on the estimated value of the fourth color component, the signal correction unit 204 (to be described later) can perform more appropriate color correction. It will be possible.
  • FIG. 10 conceptually shows the processing of the signal correction unit 204.
  • FIG. 10A shows R, G, and B values based on the fourth color component of the light actually output from the backlight unit 104 estimated by the estimation unit 202 described above.
  • FIG. 10B illustrates a case where the signal correction unit 204 outputs an input video signal when the backlight unit 104 outputs the R, G, and B values illustrated in FIG. The gain value to be applied is shown for each of R, G, and B.
  • FIG. 10C shows the R, G, and B values of the video signal input to the display device and input to the signal correction unit 204.
  • FIG. 10D shows a case where FIG. 10B is multiplied by FIG. 10C, that is, the input video signal is actually output from the backlight unit 104.
  • 4 shows R, G, and B values multiplied by a gain calculated by estimating four color components. This is an R, G, B signal having the third color component output from the signal correction unit 204, and based on this value, a drive signal for driving the display panel 100 is generated in the panel drive control unit 102 described above. It becomes.
  • the signal correction unit 112 converts the color component of the input video signal into the third color for each pixel included in the divided area according to the second color component determined by the determination unit 110.
  • the component is color corrected.
  • the signal correction unit 204 according to the second embodiment obtains the third color component according to the fourth color component estimated by the estimation unit 202 instead of the second color component. .
  • the first color component is detected based on the input video signal regardless of the configuration of each light source 105 constituting the backlight unit 104.
  • the processing of the backlight drive control unit 200 is performed according to the configuration of each light source 105 constituting the backlight unit 104.
  • a drive signal composed of various color components can be generated.
  • the input image is considered in consideration of the color of the actually emitted light.
  • the determining unit 110 uses the second color component as the color of light to be emitted from the light source of the backlight unit 104 from the first color component detected by the in-region feature amount detection unit 108.
  • the configuration has been described in which the signal correction unit 112 performs color correction on the color of the input video signal to the third color component in accordance with the second color component.
  • Embodiment 2 no matter what configuration is adopted for each light source 105 constituting the backlight unit 104, the decision by the decision unit 110 is made by the processing of the backlight drive control unit 200. From the two color components, an appropriate drive signal corresponding to the configuration of each light source 105 constituting the backlight unit 104, that is, a drive signal that emits light of the fourth color component close to the second color component is generated.
  • a drive signal that emits light of the fourth color component close to the second color component is generated.
  • the color of the light actually emitted is used.
  • a certain fourth color component is estimated by the estimation unit 202, and the color component of the input video signal is color-corrected to the third color component by the signal correction unit 204 according to the estimated fourth color component.
  • the above-described in-region feature amount detection unit 108 divides the screen into a plurality of divided regions, and the first divided region, that is, the target divided portion. Only the processing for the area has been described.
  • the influence of adjacent divided areas adjacent to the periphery of the first divided area (target divided area) in the first divided area, that is, the target divided area is further considered. A process for providing a higher-quality video signal to the user will be described.
  • the display device according to the third embodiment of the present invention includes a display panel 100, a panel drive control unit 102, a backlight unit 104, an in-region feature amount detection unit 108, a determination unit 110, and an in-region feature amount.
  • a detection unit 300, a determination unit 302, a backlight drive control unit 210, and a signal correction unit 304 are provided.
  • the display panel 100 is conceptually divided into a plurality of divided areas and displays a video corresponding to the input video signal.
  • the panel drive control unit 102 controls the drive of the display panel 100.
  • the backlight unit 104 is installed on the back surface of the display panel 100 and includes a plurality of light sources 105 (for example, LEDs in this embodiment).
  • the in-region feature amount detection unit 108 detects the first color component in the divided region that is the target region from the input video signal.
  • the determination unit 110 uses the first color component detected by the in-region feature amount detection unit 108 as a color of light to be emitted from the light source 105 corresponding to the target divided region of the backlight unit 104. decide.
  • the in-region feature quantity detection unit 300 detects the fifth color component in each peripheral region (each adjacent divided region) adjacent to the target divided region from the input video signal.
  • the determination unit 302 is a color of light to be emitted from the light source 105 (LED) arranged in each adjacent divided region of the backlight unit 104 from the fifth color component detected by the in-region feature amount detection unit 300.
  • a sixth color component is determined.
  • the in-region feature quantity detection unit 300 corresponds to the “second detection unit” of the present invention
  • the determination unit 302 corresponds to the “second determination unit” of the present invention.
  • the backlight drive control unit 210 Based on the second color component output from the determination unit 110 and the sixth color component output from the determination unit 302, the backlight drive control unit 210 performs the light source 105 of the backlight unit 104 for each divided region. A drive signal for driving is generated, and each light source 105 is driven based on the generated drive signal. In other words, the backlight drive control unit 210 controls the driving of the light source 105 so that the light of the second color component determined by the determination unit 110 is emitted from the light source 105 arranged in the target divided region. Further, the backlight drive control unit 210 controls the driving of the light source 105 so that the light of the sixth color component determined by the determination unit 302 is emitted from the light source 105 arranged in the adjacent divided region.
  • the signal correction unit 304 determines the first divided region (that is, the target) according to the second color component determined by the determination unit 110 and the sixth color component determined by the second determination unit 302. In the divided area), the color of the input video signal is corrected to the third color component.
  • the in-region feature amount The first color component detected by the detection unit 108 and the color component substantially coincide with each other, and the second color component determined by the determination unit 110 is the power consumption of the light source compared with the first color component. Is set to a decreasing value.
  • the light source 105 is driven so that the light of the second color component determined by the determination unit 110 is emitted from the light source 105 of the backlight unit 104, and the input video signal is converted by the signal correction unit 304 to the third color component.
  • the third color component is determined for each pixel in the divided region so as to substantially match the first color component.
  • the determination unit 110 may reduce the power consumption of the light source 105 of the backlight unit 104 as compared with the power consumption of the light source 105 of the backlight unit 104 when the input video signal is displayed on the display panel 100 as it is.
  • a possible color is determined as the second color component.
  • a configuration area of the second color component and the sixth color component is provided for each of a plurality of configuration areas (described later) constituting the first division area (that is, the target division area).
  • a color component is set based on the contribution degree to the.
  • the first divided area which is one divided area obtained by dividing the screen described above, can be conceptually divided into a plurality of constituent areas as shown in FIG. These constituent areas are the first sub-area of the first sub-area and the constituent area located near the boundary between the first sub-area and the adjacent sub-area adjacent to the periphery of the first sub-area. The closer to the boundary with the adjacent divided areas, the more easily affected by the color components emitted in other divided areas.
  • the configuration areas a, b, c, d, f, g, h, and i are all in contact with other peripheral division areas and are not in contact with other peripheral division areas.
  • the influence of the light from other peripheral divided areas with the area e is different.
  • the signal correction unit 304 includes a plurality of interpolation units 400 to 424. Further, as shown in FIG. 13, the first divided region 1 and the second divided region 2 are adjacent to each other in the horizontal direction, and the third divided region is arranged in the vertical direction (upward) of the first divided region 1. The region 3 is adjacent, and the fourth divided region 4 is adjacent in the vertical direction (upward) of the second divided region 2. That is, the third divided area 3 and the fourth divided area 4 are adjacent to each other in the horizontal direction. Further, the distance between the centers of the adjacent divided regions in the vertical direction and the horizontal direction is L.
  • FIG. 1 the color components of the first divided region 1 and the second divided region 2 (the R color component of each light source 105) and the horizontal coordinate values x and (Lx) are input. Interpolate the color components at 13 points A1. Similarly, the interpolation unit 402 inputs the color components of the third divided region 3 and the fourth divided region 4 (the R color component of each light source 105) and the horizontal coordinate values x and (Lx). The color component at the point A2 in FIG. 13 is interpolated.
  • the interpolation unit 404 the color component at the point A1 and the color component at the point A2 and y and (L ⁇ y) which are the coordinate values in the vertical direction are input, and the estimation target pixel P (x, y) in FIG. Interpolate color components.
  • interpolation of the G color component is performed using the interpolation units 410, 412, and 414
  • interpolation of the B color component is performed using the interpolation units 420, 422, and 424.
  • the color distribution of the second color component from the light source 105 arranged in the first divided area and the first divided area for the plurality of constituent areas constituting the first divided area is set.
  • the signal correction unit 304 the light source 105 is driven so that the second color component is emitted from the light source 105 arranged in the target divided region with respect to the plurality of constituent regions constituting the target divided region. And the color distribution of light when the light source 105 is driven so that the sixth color component is emitted from the light source 105 arranged in the adjacent divided region adjacent to the target divided region. Thus, the contribution degree is determined, and the color of the light source in each constituent area is set. Therefore, the signal correction unit 304 can obtain the third color component for color correction of the input video signal with higher accuracy in consideration of the influence of the light source in the adjacent divided region.
  • interpolation is performed for each of the R, G, and B color components. That is, in the third embodiment, the contribution is determined in consideration of the color distribution of each light source 105 in the target divided area and the adjacent divided areas.
  • the contribution is the light from the light source 105 of the target divided area to which the constituent area belongs and the adjacent divided area adjacent to the target divided area with respect to the light emitted from the backlight unit 104 to the constituent area.
  • the distance from the light source arranged in the first divided area and the first divided area for the plurality of constituent areas constituting the first divided area is set.
  • the distance from the light source 105 of the divided region to which the target configuration region belongs to the target configuration region in the horizontal direction and the vertical direction Interpolation is performed according to the distance from the light source 105 of the adjacent divided region adjacent to the target configuration region to the target configuration region in the horizontal direction and the vertical direction. That is, in the third embodiment, the contribution is determined in consideration of the distance from the light source 105 in the divided area to which the target constituent area belongs and the distance from the light source 105 in the adjacent divided area. In the third embodiment, it is assumed that the light source 105 is arranged at the center of each divided region.
  • the color components of the first divided region and each of the surrounding divided regions can be detected at any position of the plurality of component regions constituting the first divided region. According to the contribution degree, it becomes possible to set the color components of a plurality of constituent areas constituting the first divided area.
  • the contribution from the adjacent divided areas is determined linearly according to the distance, but the present invention is not limited to this.
  • the contribution may be determined by giving a curve according to the distance, or the contribution may be determined by weighting the distance.
  • the interpolation is performed in both the vertical direction and the horizontal direction.
  • the interpolation is not limited to this, and the interpolation may be performed only in one direction of the vertical direction or the horizontal direction.
  • interpolation is performed only in the horizontal direction.
  • the interpolation unit from the color component of the first divided region 1, the color component of the second divided region 2, and the horizontal coordinate values x and (Lx), the interpolation unit performs the point shown in FIG.
  • the color component at A1 is interpolated.
  • the color component of the point A1 is used for the color component of the estimation target pixel P (x, y) having the same x coordinate as the point A1.
  • the vertical direction and the horizontal direction is larger than the other when the influence on the surrounding divided regions is larger, a good result can be obtained even if interpolation is performed only in one direction of the vertical direction or the horizontal direction.
  • the storage unit 160 stores information related to the configuration of the light source 105 of the backlight unit 104 as in the second embodiment.
  • the backlight drive control unit 500 includes the second color component determined by the determination unit 110, the sixth color component determined by the determination unit 302, and the light source of the backlight unit 104 stored in the storage unit 160. Based on the configuration of 105, a drive signal for driving the light source 105 of the backlight unit 104 is generated.
  • the backlight drive control unit 500 is based on the second color component determined by the determination unit 110 and the information stored in the storage unit 160, and the light source 105 arranged corresponding to the detection target divided region.
  • the first drive signal for driving the light source 105 is generated so that light of a color close to the second color component is emitted from
  • the backlight drive control unit 500 performs the first operation from the light source 105 arranged corresponding to the adjacent divided region based on the sixth color component determined by the determination unit 302 and the information stored in the storage unit 160.
  • a second drive signal for driving the light source 105 is generated so that light of a color close to the six color components is emitted.
  • the estimation unit 502 estimates a seventh color component, which is the color of light actually emitted from the light source 105 of the backlight unit 104, based on the drive signal generated by the backlight drive control unit 500. Specifically, the estimation unit 502 is a color of light emitted from the light source 105 arranged corresponding to the detection target divided region based on the first drive signal generated by the backlight drive control unit 500. 7 color components are estimated. In addition, the estimation unit 502 is based on the second drive signal generated by the backlight drive control unit 500, and an eighth color component that is the color of light emitted from the light source 105 arranged corresponding to the adjacent divided region. Is estimated.
  • the signal correction unit 504 corrects the color of the input video signal to the third color component according to the seventh and eighth color components estimated by the estimation unit 502.
  • the signal correction unit 304 obtains the third color component according to the second color component and the sixth color component.
  • the signal correction unit 504 uses the seventh color component instead of the second color component, and uses the eighth color component instead of the sixth color component. To obtain the third color component. That is, the signal correction unit 504 obtains the third color component based on the contributions of the seventh color component and the eighth color component in the configuration area.
  • the detection target divided region In FIG. 2 the first color component substantially coincides with the first color component.
  • the seventh color component which is the color of light emitted from the light source 105, is compared with the power consumption of the light source when the video signal is displayed on the display panel 100 without color correction to the third color component. In this color, the power consumption of the light source 105 is reduced.
  • the in-region feature amount detection unit 108 may detect a plurality of types of first color components in the divided regions. For example, the in-region feature amount detection unit 108 detects the average color in each divided region and the maximum value (maximum value of a specific color) for each of R, G, and B in each divided region as the first color component. It may be. When priority is given to reducing power consumption of the backlight unit 104, the determination unit 110 determines the average color in each divided region as the second color component, and prioritizes faithfully reproducing the input video signal. In this case, the color composed of the maximum values for each of R, G, and B in each divided region may be determined as the second color component.
  • the determination unit 110 faithfully inputs the input video signal according to the average color in each divided region and the maximum value for each R, G, and B in each divided region detected by the in-region feature amount detection unit 108. It is also possible to switch between reproducing the image and shifting to some extent. Further, for example, an input unit operated by the user may be provided so that the user can set which of power consumption reduction and faithful reproduction of the input video signal has priority. Further, whether to give priority to faithful color reproduction or to reduce power consumption may be set in advance according to the specifications of each display device.
  • the backlight unit 104 adopts a direct type
  • an edge light method may be adopted.
  • a backlight unit of an edge light system a plurality of LEDs are disposed along one end face of the display panel along the end face, and the other end side opposite to the one end side of the display panel is provided along the end face.
  • positioned several LED is employable.
  • a mode in which interpolation is performed only in one vertical direction or one horizontal direction as described with reference to FIG. 15 is preferable. Can be applied.
  • a display device includes a display panel that is conceptually divided into a plurality of divided regions each including a plurality of pixels, and that displays a video corresponding to an input video signal.
  • a plurality of light sources arranged corresponding to each of the divided regions, each configured to be capable of irradiating a plurality of colors of light onto the display panel from the back side, and the divided regions to which the light from each of the light sources is irradiated.
  • a detection unit that detects a first color component based on the video signal and a first color component that is detected by the detection unit for each of the divided regions.
  • the color of the video signal is determined according to the determination unit that determines a second color component for each of the divided regions and the second color component determined by the determination unit as the color of light to be emitted by the light source.
  • the division A correction unit that performs color correction to a third color component for each of the pixels included in the area, and the light source is driven so that the light of the second color component is emitted from the light source.
  • the video signal When the video signal is color-corrected to the third color component for each pixel, for each of the divided regions, the video signal substantially matches the first color component, and the determination unit converts the video signal to The color that reduces the power consumption of the light source is determined as the second color component as compared to the power consumption of the light source when displaying on the display panel without performing color correction on the third color component.
  • the first color component is detected by the detection unit based on the video signal for each divided region irradiated with the light from each light source, and the first color component is detected based on the detected first color component.
  • the second color component is determined by the determining unit as the color of light to be emitted by the light source arranged corresponding to the divided area. Further, according to the determined second color component, the color of the video signal is color-corrected by the correction unit to the third color component for each pixel included in the divided area.
  • the light source is driven so that the light of the second color component is emitted from the light source, and the video signal is color-corrected to the third color component for each pixel by the correction unit, Since it substantially matches the color component of 1, the video of the same color as the video corresponding to the input video signal can be displayed on the display panel.
  • the color that reduces the power consumption of the light source compared to the power consumption of the light source when the determining unit displays the video signal on the display panel without correcting the color to the third color component is the second color component. Therefore, the power consumption of the light source can be reduced for each divided region.
  • the determining unit determines a color other than white as the second color component.
  • the color of light is formed by additive color mixing, when the light source emits light of a plurality of colors, the light of the most color is emitted when irradiating white light. In other words, the power consumption of the light source is maximized when white light is irradiated. Therefore, according to this configuration, since the color other than white is determined as the second color component by the determination unit, the power consumption of the light source can be reduced.
  • the determination unit is configured such that the light source is driven so that the light of the second color component is emitted from the light source, and the video signal is converted into the third color component by the correction unit.
  • the color correction is performed, all the colors of the pixels included in the divided area of the video signal are in a range that can be displayed on the display panel, and the video signal is converted into the third signal. It is preferable to determine, as the second color component, a color that reduces the power consumption of the light source as compared to the power consumption of the light source when the color component is displayed on the display panel without color correction.
  • the divided region of the video signal Compared with the power consumption of the light source when displaying all the colors of each pixel included in the display panel on the display panel without correcting the video signal to the third color component. Then, the color that reduces the power consumption of the light source is determined as the second color component by the determination unit. Therefore, it is possible to reduce the power consumption of the light source while giving priority to displaying an image faithful to the input video signal on the display panel.
  • the table further includes a table that associates the color of each pixel with a third color component that performs color correction, and the determination unit corresponds to the first color component detected by the detection unit based on the table.
  • the attached second color component is obtained, and the correction unit obtains a third color component associated with the first color component detected by the detection unit based on the table.
  • the second color component that is the color of light to be emitted from the light source and the color component of each pixel of the video signal are changed.
  • a table is provided in which the third color components for color correction are associated with each other. Then, the second color component associated with the first color component detected by the detection unit is obtained by the determination unit, and the third color associated with the first color component detected by the detection unit The component is obtained by the correction unit. Therefore, the second color component and the third color component can be obtained at high speed with a simple configuration.
  • the storage unit that stores information on the light of the plurality of colors that can be irradiated by the light sources, the second color component determined by the determination unit, and the storage unit are stored. For each of the divided regions based on the information, and a drive control unit that generates a drive signal for driving the light source, and for each of the divided regions based on the drive signal generated by the drive control unit.
  • An estimation unit that estimates a fourth color component that is a color of light emitted from a light source, and the correction unit is configured to estimate the fourth color estimated by the estimation unit instead of the second color component.
  • the third color component is obtained according to the color component
  • the light of the fourth color component is emitted from the light source
  • the video signal is color-corrected to the third color component by the correction unit
  • the first The fourth color component of light that substantially matches a color component and is emitted from the light source is displayed when the video signal is displayed on the display panel without color correction to the third color component. It is preferable that the color is such that the power consumption of the light source is reduced compared to the power consumption of the light source.
  • the drive signal for driving the light source is generated for each divided region based on the determined second color component and information on the light of a plurality of colors that can be emitted from the light source stored in the storage unit. Generated by the drive controller.
  • a fourth color component that is the color of light emitted from the light source is estimated by the estimation unit for each divided region. Further, the third color component is obtained by the correction unit according to the fourth color component estimated by the estimation unit instead of the second color component.
  • the fourth color component of the light emitted from the light source is the power consumption of the light source compared to the power consumption of the light source when the video signal is displayed on the display panel without color correction to the third color component. Therefore, the power consumption of the light source can be reduced for each divided region.
  • a fifth color component is detected based on the video signal in an adjacent divided region adjacent to a detection target divided region that is a detection target of the first color component by the detection unit.
  • a sixth color A second determination unit that determines a component
  • the correction unit includes the second color component determined by the determination unit and the sixth color component determined by the second determination unit.
  • the correction unit further contributes the second color component and the sixth color component in a configuration area obtained by further dividing the divided area into a plurality of divided areas.
  • the third color component is obtained based on the degree. Arbitrariness.
  • the fifth color component is detected by the second detection unit based on the video signal in the adjacent divided region adjacent to the detection target divided region that is the detection target of the first color component by the detection unit.
  • the sixth color component is the second determination unit as the color of light to be emitted by the light source arranged corresponding to the adjacent divided region. Determined by.
  • the third color component is obtained by the correction unit in accordance with the determined second color component and sixth color component.
  • the correction unit further determines the third color component based on the contributions of the second color component and the sixth color component in the configuration area obtained by further dividing the divided area. Therefore, the third color component can be obtained more finely for each constituent region while taking into account the influence from the adjacent divided regions.
  • the correction unit may arrange the light of the second color component corresponding to the detection target divided region for each of the plurality of constituent regions constituting the detection target divided region.
  • the color distribution of light when the light source is driven so as to be emitted from the light source, and the light source so that the light of the sixth color component is emitted from the light source arranged corresponding to the adjacent divided region It is preferable to determine the degree of contribution in accordance with the color distribution of light when is driven.
  • the light source is driven so that the light of the second color component is emitted from the light source arranged corresponding to the detection target divided region for each of the plurality of constituent regions constituting the detection target divided region.
  • the contribution is determined by the correction unit. Therefore, since the contribution is determined according to the color distribution of the light from each light source, the third color component can be obtained more finely.
  • the correction unit may include, for each of the plurality of constituent regions constituting the detection target divided region, a distance from a light source arranged corresponding to the detection target divided region, and the adjacent division. It is preferable to determine the degree of contribution according to the distance from the light source arranged corresponding to the region.
  • the distance from the light source arranged corresponding to the detection target divided area and the distance from the light source arranged corresponding to the adjacent divided area for each of the plurality of constituent areas constituting the detection target divided area is determined by the correction unit according to the distance. Therefore, the third color component can be easily obtained by obtaining each distance.
  • the plurality of constituent regions are composed of a plurality or a single pixel. According to this configuration, since the plurality of configuration regions are configured by a plurality or a single pixel, the third color component can be obtained more finely for each of the plurality of pixels or the single pixel.
  • the storage unit stores information on the light of the plurality of colors that can be emitted by the light sources, the second color component determined by the determination unit, and the storage unit. And generating the first drive signal for driving the light source arranged corresponding to the detection target divided region, and storing the sixth color component determined by the second determination unit and the storage
  • a drive control unit that generates a second drive signal for driving a light source arranged corresponding to the adjacent divided region based on the information stored in the unit, and the first generated by the drive control unit Based on the drive signal, the seventh color component, which is the color of light emitted from the light source arranged corresponding to the detection target divided region, is estimated, and based on the second drive signal, corresponding to the adjacent divided region From the light source
  • An estimating unit that estimates an eighth color component that is the color of the emitted light, and the correction unit replaces the second color component with the seventh color component estimated by the estimating unit.
  • the eighth color component estimated by the estimation unit instead of the sixth color component to obtain the third color component, and the light of the seventh color component is emitted from the light source.
  • the detection target divided region substantially coincides with the first color component and is emitted from the light source.
  • the seventh color component which is a color of light, is compared with the power consumption of the light source when the video signal is displayed on the display panel without color correction to the third color component. It is preferable that the color reduce power consumption.
  • the second color component determined by the determination unit and the information related to the light of a plurality of colors that can be emitted by each light source stored in the storage unit are arranged corresponding to the detection target divided regions.
  • a first drive signal for driving the light source is generated by the drive control unit.
  • the light source is arranged corresponding to the adjacent divided region.
  • a second drive signal for driving the light source is generated by the drive control unit.
  • the estimation unit estimates the seventh color component that is the color of light emitted from the light source arranged in the detection target divided region.
  • an eighth color component that is the color of light emitted from the light source arranged in the adjacent divided region is estimated by the estimation unit.
  • the correction unit obtains the third color component by using the seventh color component instead of the second color component and using the eighth color component instead of the sixth color component.
  • the first color component substantially coincides with the detection target divided region. Therefore, an image having the same color as the image corresponding to the input image signal can be displayed on the display panel.
  • the seventh color component which is the color of light emitted from the light source, is compared with the power consumption of the light source when the video signal is displayed on the display panel without color correction to the third color component. Therefore, the power consumption of the light source can be reduced.
  • the detection unit may calculate at least one of an average color in the divided area of the video signal and a maximum value of a specific color in the divided area of the video signal in the first area. It is preferable to detect it as a color component.
  • At least one of the average color in the divided area of the video signal and the maximum value of the specific color in the divided area of the video signal is detected by the detection unit as the first color component.
  • the average color of each pixel included in the divided area of the video signal is detected as the first color component and the average color is determined as the second color component by the determination unit, the average color is white The farther away the color is, the lower the power consumption of the light source.
  • the correction unit By performing color correction according to the above, an image faithful to the input video signal can be displayed on the display panel.
  • each of the plurality of light sources emits a first light source that emits light of a first color, and a second light that emits light of a second color different from the first color.
  • the second color component determined by the determining unit includes a light source, and the first and second when the video signal is displayed on the display panel without color correction to the third color component.
  • the light amount of at least one of the first and second light sources is reduced, and the light amount of light sources other than the light source with the reduced light amount is not increased.
  • the second color component determined by the determination unit is the light amounts of the first and second light sources when the video signal is displayed on the display panel without color correction to the third color component.
  • the light amount of at least one of the first and second light sources is decreased, and the light amount of light sources other than the light source whose light amount is decreased is not increased.
  • the color is equal to the combined color of the light emitted from the first and second light sources. Therefore, the overall power consumption of the first and second light sources can be reduced as compared with the case where the input video signal is displayed on the display panel without color correction to the third color component.
  • a display method includes a display panel that is conceptually divided into a plurality of divided regions each including a plurality of pixels, and displays a video corresponding to an input video signal,
  • a display method used for a display device that is arranged corresponding to each of the divided areas of the panel, and each includes a plurality of light sources configured to be able to irradiate light of a plurality of colors from the back to the display panel,
  • the first color component is detected by the detection step based on the video signal for each divided region irradiated with the light from each light source, and based on the detected first color component,
  • the second color component is determined by the determining step as the color of light to be emitted by the light source arranged corresponding to the divided area. Further, according to the determined second color component, the color of the video signal is color-corrected to the third color component by the correction step for each pixel included in the divided area.
  • the light source is driven so that the light of the second color component is emitted from the light source, and the video signal is color corrected to the third color component for each pixel by the correction step, Since it substantially matches the color component of 1, the video of the same color as the video corresponding to the input video signal can be displayed on the display panel.
  • the color that reduces the power consumption of the light source compared to the power consumption of the light source when the video signal is displayed on the display panel without color correction to the third color component is the second color component. Therefore, the power consumption of the light source can be reduced for each divided region.
  • a fifth color component is detected based on the video signal in an adjacent divided region adjacent to a detection target divided region that is a detection target of the first color component in the detection step.
  • the sixth color A second determination step for determining a component, wherein the correction step includes the second color component determined by the determination step and the sixth color component determined by the second determination step.
  • determining the third color component, and the correcting step further includes: calculating the third color component between the second color component and the sixth color component in a configuration region obtained by further dividing the divided region. Based on Azukado, they are preferable to determine the third color component.
  • the fifth color component is detected by the second detection step based on the video signal in the adjacent divided region adjacent to the detection target divided region that is the detection target of the first color component by the detection step.
  • the sixth color component is the second determination step as the color of light to be emitted by the light source arranged corresponding to the adjacent divided region. Determined by.
  • the third color component is obtained by the correction step.
  • the third color component is obtained based on the contribution degree of the second color component and the sixth color component in the configuration area obtained by further dividing the divided area. Therefore, the third color component can be obtained more finely for each constituent region while taking into account the influence from the adjacent divided regions.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal (AREA)

Abstract

L'invention concerne un dispositif d'affichage capable de produire une vidéo présentant une qualité d'image appropriée et qui consomme moins d'énergie électrique. Un panneau d'affichage (100) est conçu de manière à être divisé en une pluralité de régions segmentées, et une unité de rétroéclairage (104) est pourvue d'une source lumineuse (105) correspondant à chacune des régions segmentées mentionnées. Ce dispositif d'affichage comporte une unité de détection (108) qui détecte, pour chaque région segmentée, une première composante de couleur sur la base du signal vidéo introduit; une unité de détermination (110) qui détermine une deuxième composante de couleur, sur la base de la première composante de couleur, comme la couleur devant être émise par une source lumineuse (105); et une unité de correction (112) qui règle la couleur du signal vidéo par rapport à une troisième composante de couleur, en fonction de la deuxième composante de couleur déterminée par l'unité de détermination (110). L'unité de détermination (110) détermine comme deuxième composante de couleur la couleur qui, combinée à la troisième composante de couleur, correspond sensiblement à la première composante de couleur, de sorte que la consommation d'énergie électrique de la source lumineuse (105) est inférieure à celle qui existe lorsque le signal vidéo ne comporte pas de réglage de la couleur en fonction de la troisième composante de couleur.
PCT/JP2010/007018 2009-12-28 2010-12-02 Dispositif et procédé d'affichage WO2011080875A1 (fr)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012114682A1 (fr) * 2011-02-23 2012-08-30 パナソニック株式会社 Dispositif d'affichage et procédé d'affichage
JP2014182192A (ja) * 2013-03-18 2014-09-29 Canon Inc 画像表示装置及びその制御方法
CN107393485A (zh) * 2017-08-14 2017-11-24 天津大学 应用于新型背光源的区域调光方法

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JP2008090076A (ja) * 2006-10-03 2008-04-17 Sharp Corp 液晶表示装置
WO2009110129A1 (fr) * 2008-03-03 2009-09-11 シャープ株式会社 Dispositif d'affichage à cristaux liquides

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008090076A (ja) * 2006-10-03 2008-04-17 Sharp Corp 液晶表示装置
WO2009110129A1 (fr) * 2008-03-03 2009-09-11 シャープ株式会社 Dispositif d'affichage à cristaux liquides

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012114682A1 (fr) * 2011-02-23 2012-08-30 パナソニック株式会社 Dispositif d'affichage et procédé d'affichage
US9305495B2 (en) 2011-02-23 2016-04-05 Panasonic Intellectual Property Management Co., Ltd. Display device and display method for estimating backlight luminance distribution
JP2014182192A (ja) * 2013-03-18 2014-09-29 Canon Inc 画像表示装置及びその制御方法
CN107393485A (zh) * 2017-08-14 2017-11-24 天津大学 应用于新型背光源的区域调光方法

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