WO2011111162A1 - Dispositif d'affichage d'image et procédé d'affichage d'image - Google Patents

Dispositif d'affichage d'image et procédé d'affichage d'image Download PDF

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Publication number
WO2011111162A1
WO2011111162A1 PCT/JP2010/053865 JP2010053865W WO2011111162A1 WO 2011111162 A1 WO2011111162 A1 WO 2011111162A1 JP 2010053865 W JP2010053865 W JP 2010053865W WO 2011111162 A1 WO2011111162 A1 WO 2011111162A1
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WIPO (PCT)
Prior art keywords
group
video
color
color space
filters
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PCT/JP2010/053865
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English (en)
Japanese (ja)
Inventor
堀　宏昭
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Ｎｅｃディスプレイソリューションズ株式会社
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Priority to JP2012504188A priority Critical patent/JPWO2011111162A1/ja
Priority to PCT/JP2010/053865 priority patent/WO2011111162A1/fr
Publication of WO2011111162A1 publication Critical patent/WO2011111162A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3102—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators
    • H04N9/3111—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators for displaying the colours sequentially, e.g. by using sequentially activated light sources
    • H04N9/3114—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators for displaying the colours sequentially, e.g. by using sequentially activated light sources by using a sequential colour filter producing one colour at a time
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G09G3/3413—Details of control of colour illumination sources
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3179—Video signal processing therefor
    • H04N9/3182—Colour adjustment, e.g. white balance, shading or gamut
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0235—Field-sequential colour display
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
    • G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2340/00—Aspects of display data processing
    • G09G2340/06—Colour space transformation
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/02—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the way in which colour is displayed

Definitions

  • the present invention relates to a video display device and a video display method.
  • a projector that displays a color image reproduces the color of an image using, for example, three light sources of red, green, and blue.
  • Patent Document 1 describes a projector using three-color optical filters.
  • the projector described in Patent Document 1 includes a color wheel on which optical filters for a blue light transmission region, a red light transmission region, and a green light transmission region are arranged, and a projection panel.
  • An object of the present invention is to provide a video display device and a video display method that solve the above-described problems.
  • the video display device of the present invention is a video display device having a light modulation element that modulates a plurality of sequentially incident color lights based on a video signal and displays them as a video image, and a plurality of color lights for expressing a first color space.
  • a color wheel that emits light passing through the filters of the first group and the second group in a time-division manner, and an image indicated by the image signal is in the first color space.
  • Detecting means for detecting whether or not the video indicated by the video signal is within the first color space by the detecting means, the first group and the second group The light passing through the filter is incident on the light modulation element, Control means for causing the light passing through the second group of filters to enter the light modulation element when the detection means detects that the image shown in the video signal is not in the first color space; ,including.
  • the image display method of the present invention includes a plurality of first group filters that respectively pass a plurality of first group lights for expressing the first color space, and a second wider than the first color space.
  • a color wheel including a plurality of second group filters that respectively pass a plurality of second group lights for expressing a color space, and sequentially modulating a plurality of color lights incident on the basis of a video signal as an image
  • the brightness of the displayed image can be improved.
  • FIG. 3 is a diagram illustrating a configuration example of a color wheel 2.
  • 3 is a block diagram illustrating a configuration example of a detector 4.
  • FIG. 4 is a flowchart illustrating an example of a processing procedure of a video display method in the video display device 10.
  • FIG. 1 is a block diagram illustrating a configuration example of a video display device according to an embodiment of the present invention.
  • the video display device 10 is a projection display device that receives a video signal from the video signal line 5i and projects a video on a screen.
  • the video display device 10 includes a light source 1, a color wheel 2, a projection lens 3, a detector 4, a signal interface 5, a signal processing circuit 6, a drive circuit 7, a video display device 8, and a synchronization circuit 9. And comprising.
  • the light source 1 is a lamp that emits white light.
  • the light source 1 irradiates the color wheel 2 with white light under the control of the synchronization circuit 9.
  • the color wheel 2 includes a plurality of first group filters (hereinafter referred to as “broadband filters”) that respectively pass a first group of light for expressing a first color space (hereinafter referred to as “color space a”). And a plurality of second group filters that respectively pass light of the second group for expressing a second color space (hereinafter referred to as “color space b”) wider than the first color space ( Hereinafter referred to as “narrow band filter”), and the light passing through the filters of the first group and the second group is emitted in a time division manner.
  • first group filters hereinafter referred to as “broadband filters”
  • color space b second color space
  • the color wheel 2 includes first to third narrow-pass filters that pass primary color lights of red, green, and blue for expressing the color space a, red for expressing the color space b, 4th to 6th wide-area filters that allow green and blue primary color light to pass therethrough, and these filters are constituted by disks that are arranged along the circumferential direction.
  • the color wheel 2 irradiates the video display device 8 with each color light color-separated by time division. That is, the color wheel 2 switches the timing of emitting each separated color light at a constant period.
  • the synchronization circuit 9 synchronizes the timing of color separation by the color wheel 2 and the timing of light modulation by the video display device 8 with each other.
  • the synchronization circuit 9 receives a vertical synchronization signal included in the video signal from the video signal line 5i from the signal interface 5, and rotates the color wheel 2 in synchronization with the vertical synchronization signal.
  • the synchronization circuit 9 supplies a synchronization signal based on the rotation period of the color wheel 2 to the drive circuit 7.
  • the synchronization circuit 9 controls the light source 1.
  • the signal interface 5 receives an analog video signal from the video signal line 5i. When receiving the video signal from the video signal line 5i, the signal interface 5 converts the video signal into a digital signal. The signal interface 5 supplies the converted video signal of the digital signal to the detector 4, the signal processing circuit 6, and the synchronization circuit 9.
  • the detector 4 can generally be called a detection means.
  • the detector 4 detects whether or not the video indicated by the video signal is in the first color space. In this embodiment, the detector 4 indicates that the video indicated by the video signal is in the color gamut of the color space a. (Hereinafter referred to as “basic area”) or a color gamut outside the basic area (hereinafter referred to as “extended area”).
  • the basic region is a color space a of the video display device 10 in the case where each color light color-separated by a wide-area filter of three colors among a plurality of filters constituting the color wheel 2 is used as a light source.
  • the basic region is defined on the basis of tristimulus values XYZ calculated from the measurement results of RGB chromaticity points measured using light of each color separated by a three-color wide-area filter.
  • the extended region is a color gamut belonging to the color space b of the video display device 10 when each color light color-separated by the narrow-color filters of three colors is used as a light source.
  • the extended area of the color space b measures RGB chromaticity points when each color light color-separated by the narrow-color filters of three colors is used as a light source, and based on the tristimulus values XYZ calculated from the measurement results. It is prescribed.
  • FIG. 2 is an xy chromaticity diagram conceptually showing an example of the relationship between the color space a and the color space b.
  • the color space a of the video display device 10 is indicated by a shaded line
  • the boundary line of the color space b of the video display device 10 is indicated by a solid line.
  • the color gamut of the color space (hereinafter referred to as “color space c”) of the video signal input from the video signal line 5i the boundary line of the color space c1 is indicated by a broken line
  • the color space c2 is indicated by a solid line. It is shown.
  • the color space c of the video signal for example, there is a color space (third color space) defined by sRGB (standard RGB).
  • an area belonging to the color space a in the color space c1 or the color space c2 is a basic area, and a color gamut outside the basic area in the color space c1 or the color space c2 is an extended area.
  • the detector 4 holds basic information for converting from the color space a to the color space c and extended information for converting from the color space b to the color space c.
  • the detector 4 receives the video signal from the signal interface 5 and converts the video signal into the first video data based on the basic information.
  • the detector 4 detects that the video indicated by the video signal is within the basic area.
  • the detector 4 supplies the first video data to the signal processing circuit 6 when detecting that the video shown in the video signal is in the basic region.
  • the detector 4 detects that the video shown in the video signal is outside the basic area. When the detector 4 detects that the video signal is outside the basic area, the detector 4 discards the first video data.
  • the detector 4 when the detector 4 receives a video signal from the signal interface 5, the detector 4 converts the video signal into second video data based on the extended information. The detector 4 supplies the converted second video data to the signal processing circuit 6.
  • the signal processing circuit 6 can be generally referred to as control means.
  • the signal processing circuit 6 enters the light passing through the first to sixth filters into the video display device 8.
  • the detector 4 detects that the image shown in the image signal is not in the color space a, the light passing through the fourth to sixth narrow-pass filters is incident on the image display device 8.
  • the signal processing circuit 6 when receiving the first or second video data from the detector 4, the signal processing circuit 6 holds the video data.
  • the signal processing circuit 6 supplies the held video data to the drive circuit 7 in accordance with the order of the color lights that are color-separated by the color wheel 2.
  • the white light from the light source 1 is converted into a red, green, blue wide band filter, a red, green, blue narrow band filter,
  • the first video data of red, green, and blue and the second video data of red, green, and blue are supplied to the drive circuit 7 in each period that passes through, respectively.
  • the red, green, and blue second light is emitted during each period when the white light from the light source 1 passes through the red, green, and blue narrow-pass filters.
  • the video data is supplied to the drive circuit 7 respectively.
  • the drive circuit 7 receives a synchronization signal from the synchronization circuit 9. Further, the drive circuit 7 receives the first or second video data from the signal processing circuit 6. The drive circuit 7 generates a control signal for driving the video display device 8 based on the first or second video data according to the synchronization signal. The drive circuit 7 supplies the control signal to the video display device 8.
  • the video display device 8 can generally be called a light modulation element.
  • the video display device 8 modulates a plurality of sequentially incident color lights based on the video signal and displays them as a video.
  • the video display device 8 modulates each color light color-separated by the color wheel 2 based on a control signal from the drive circuit 7.
  • the video display device 8 is realized by, for example, DMD (Digital Micromirror Device).
  • the video display device 8 outputs the modulated light to the projection lens 3 as a video.
  • the projection lens 3 projects the video output from the video display device 8 onto the screen.
  • FIG. 3 is a diagram showing a configuration example of the color wheel 2.
  • the color wheel 2 includes a red wide-area filter 21 as a first filter, a green wide-area filter 22 as a second filter, a blue wide-area filter 23 as a third filter, A red narrow band filter 24 as a fifth filter, a green narrow band filter 25 as a fifth filter, and a blue narrow band filter 26 as a sixth filter.
  • the red wide-area filter 21, the green wide-area filter 22, and the blue wide-area filter 23 are wide-area filters for expressing the color space a.
  • Each of the red wide band filter 21, the green wide band filter 22 and the blue wide band filter 23 has a wider pass band than each of the red narrow band filter 24, the green narrow band filter 25 and the blue narrow band filter 26.
  • each of the red wide band filter 21, the green wide band filter 22, and the blue wide band filter 23 has a wider filter area than each of the red narrow band filter 24, the green narrow band filter 25, and the blue narrow band filter 26. That is, the emission period of each passing light of the red wide band filter 21, the green wide band filter 22, and the blue wide band filter 23 is longer than the emission period of each passing light of the red narrow band filter 24, the green narrow band filter 25, and the blue narrow band filter 26. Also long.
  • the red wide-area filter 21 passes red light having a wide wavelength band and reflects or absorbs other color lights.
  • the green wide-area filter 22 passes only green light having a wide wavelength band, and reflects or absorbs other color lights.
  • the blue wide-area filter 23 passes only blue light having a wide wavelength band and reflects or absorbs other color lights.
  • the red narrow band filter 24, the green narrow band filter 25, and the blue narrow band filter 26 are narrow band filters for expressing the color space b.
  • the red narrow filter 24 allows only red light having a narrow wavelength band to pass and reflects or absorbs other color light.
  • the green narrow band filter 25 allows only green light having a narrow wavelength band to pass and reflects or absorbs other color lights.
  • the blue narrow band filter 26 passes only blue light having a narrow wavelength band and reflects or absorbs other color lights.
  • the color wheel 2 rotates in synchronization with the vertical synchronization of the video, and the red wide band filter 21, the green wide band filter 22, the blue wide band filter 23, the red narrow band filter 24, the green narrow band filter 25, Each segment of the blue narrow band filter 26 sequentially passes through the optical path.
  • the signal processing circuit 6 passes through the drive circuit 7 in each period in which the filters (segments) 21 to 26 of the color wheel 2 pass through the optical path.
  • Red, green, and blue first video data (seq1) and red, green, and blue second video data (seq2) are output to the video display device 8.
  • the video display device 8 sequentially displays the red video, green video, and blue video in the basic color space a, and the red video, green video, and blue video in the expanded color space b.
  • the signal processing circuit 6 passes the second video data (seq 2) of red, green, and blue, and the narrow band filters 24 to 26 pass through the optical path. Output during the period.
  • the video display device 10 temporally superimposes the video based on the basic color space a and the video based on the expanded color space b on the basis of the video shown in the video signal. To reproduce.
  • FIG. 4 is a block diagram showing a configuration example of the detector 4.
  • the video signal supplied from the signal line 4i conforms to the sRGB standard and is subjected to gamma correction.
  • the video signal includes an R (red) signal, a G (green) signal, and a B (blue) signal.
  • the detector 4 includes gamma reverse correction units 41r, 41g and 41b, matrix circuits 42, 43, 44, 53 and 54, a limit circuit 45, gamma correction units 46r, 46g, 46b, 56r, 56g and 56b, Data generation units 47 and 57.
  • the gamma reverse correction units 41r, 41g, and 41b perform degamma correction for correcting a video signal having gamma characteristics to linear characteristics.
  • the gamma reverse correction units 41r, 41g, and 41b respectively hold lookup tables LUT1r, LUT1g, and LUT1b for converting the video signal subjected to gamma correction into linear characteristics.
  • the gamma reverse correction unit 41r When receiving the R signal from the signal line 4i, the gamma reverse correction unit 41r performs degamma correction on the R signal based on the lookup table LUT1r.
  • the gamma reverse correction unit 41g When receiving the G signal from the signal line 4i, the gamma reverse correction unit 41g performs degamma correction on the G signal based on the lookup table LUT1g.
  • the gamma reverse correction unit 41b When receiving the B signal from the signal line 4i, the gamma reverse correction unit 41b performs degamma correction on the B signal based on the lookup table LUT1b.
  • the gamma reverse correction units 41r, 41g, and 41b supply the R signal, the G signal, and the B signal subjected to the degamma correction to the matrix circuit 42 as video signals.
  • the matrix circuit 42 can be generally referred to as first conversion means.
  • the matrix circuit 42 converts the video signal from the RGB space to the XYZ space.
  • the matrix circuit 42 holds a 3 ⁇ 3 matrix M1 calculated based on the sRGB chromaticity points.
  • the matrix circuit 42 When the matrix circuit 42 receives the video signal from the gamma inverse correction units 41r, 41g, and 41b, the matrix circuit 42 converts the video signal from the RGB space to the XYZ space using the matrix M1. The matrix circuit 42 converts the video signal according to the following equation.
  • R, B, and G are video signals received from the gamma reverse correction units 41r, 41g, and 41b.
  • Xi, Yi, and Zi are converted video signals.
  • the matrix circuit 42 supplies the converted video signal to the matrix circuit 43 and the matrix circuit 53, respectively.
  • the matrix circuit 43 can be generally referred to as second conversion means.
  • the matrix circuit 43 converts the video signal from the color space a of the video display device 10 to the sRGB color space c (third color space).
  • the matrix circuit 43 holds a conversion matrix K1 as reference information (conversion information) for converting a video signal from the color space a of the video display device 10 to the sRGB color space c.
  • the conversion coefficient K1 is expressed by Equation 1.
  • P1 is a matrix in which sRGB chromaticity points R (Xr, Yr, Zr), G (Xg, Yg, Zg), and B (Xb, Yb, Zb) are arranged vertically.
  • the chromaticity points R (Xr, Yr, Zr), G (Xg, Yg, Zg), and B (Xb, Yb, Zb) are values defined by sRGB.
  • P2 is a matrix in which chromaticity points R (Xr, Yr, Zr), G (Xg, Yg, Zg), and B (Xb, Yb, Zb) in the color space a of the video display device 10 are arranged vertically. It is.
  • the chromaticity point of the color space a is obtained by, for example, measuring x, y, L values using a color illuminometer or the like and converting the measurement results into XYZ values.
  • the matrix circuit 43 converts the video signal from the color space a of the video display device 10 to the sRGB color space c based on the conversion matrix K1.
  • the matrix circuit 43 converts the video signal according to the following equation.
  • Xo1, Yo1, and Zo1 are converted video signals.
  • the matrix circuit 43 supplies the converted video signal to the matrix circuit 44 as a first video signal.
  • the matrix circuit 44 can be generally referred to as third conversion means.
  • the matrix circuit 44 returns the video signal from the XYZ space to the RGB space.
  • the matrix circuit 44 holds a 3 ⁇ 3 matrix M4 for converting the video signal from the XYZ space to the RGB space.
  • the matrix circuit 44 When the matrix circuit 44 receives the first video signal from the matrix circuit 43, the matrix circuit 44 converts the video signal from the XYZ space to the RGB space using the matrix M4. The matrix circuit 44 converts the video signal according to the following equation.
  • R1, G1, and B1 are converted video signals.
  • the matrix circuit 44 supplies the converted first video signal to the limit circuit 45. Since the color space a is narrower than the sRGB color space c, all colors cannot be reproduced even if they can be calculated.
  • the limit circuit 45 can be generally called a determination means.
  • the limit circuit 45 determines whether each color value of the video signal converted by the matrix circuit 44 exceeds a predetermined output range. If the color value does not exceed the predetermined output range, the video signal is in the color space a. Is detected.
  • the limit circuit 45 when the limit circuit 45 receives the first video signal from the matrix circuit 44, the limit circuit 45 discards the first video signal not included in the color space a.
  • the limit circuit 45 discards the first video signal when the signal (gradation) level of at least one of the R signal, G signal, and B signal constituting the first video signal exceeds a predetermined output range. To do.
  • the limit circuit 45 when the first video signal is represented by an 8-bit gradation, the limit circuit 45 has one of the gradation levels of the R signal, the G signal, and the B signal that is “0” or less or exceeds “255”. In this case, the gradation levels of the R, G, and B signals are all set to “0”. Thereby, the limit circuit 45 invalidates the first video signal not included in the reference area of the color space a.
  • the limit circuit 45 sends the R signal, the G signal, and the B signal constituted by the first video signal to the gamma correction units 46r, 46g, and 46b. Supply each.
  • the gamma correction units 46r, 46g, and 46b perform gamma correction for correcting the video signal based on the gamma characteristic of the video display device 10.
  • the gamma correction units 46r, 46g, and 46b respectively hold lookup tables LUT2r, LUT2g, and LUT2b for performing gamma correction.
  • the gamma correction unit 46r When the R signal is received from the limiter circuit 45, the gamma correction unit 46r performs gamma correction on the R signal based on the lookup table LUT2r.
  • the gamma correction unit 46g When receiving the G signal from the limiter circuit 45, the gamma correction unit 46g performs gamma correction on the G signal based on the lookup table LUT2g.
  • the gamma correction unit 46b performs gamma correction on the B signal based on the lookup table LUT2b.
  • the gamma correction units 46r, 46g, and 46b supply the first video signals (Rout1, Gout1, and Bout1) subjected to the gamma correction to the data generation unit 47.
  • the data generation unit 47 When the data generation unit 47 receives the first video signal from the gamma correction units 46r, 46g, and 46b, the data generation unit 47 converts the first video signal into a predetermined format and outputs it to the signal processing unit 6 as first video data (seq1). Supply.
  • the matrix circuit 53 converts the video signal from the color space b of the video display device 10 to the sRGB color space c.
  • the matrix circuit 53 holds a conversion matrix K2 as extended information for converting the video signal from the color space b of the video display device 10 to the sRGB color space c. Note that the conversion coefficient K2 can be expressed in the same manner as Equation 1.
  • the matrix circuit 53 When the matrix circuit 53 receives the video signal from the matrix circuit 52, the matrix circuit 53 converts the video signal from the color space b of the video display device 10 to the sRGB color space c using the conversion matrix K2. The matrix circuit 53 supplies the converted video signal to the matrix circuit 54 as a second video signal.
  • the matrix circuit 54 converts the second video signal from the XYZ space to the RGB space.
  • the matrix circuit 54 holds a 3 ⁇ 3 matrix M5 for converting from the XYZ space to the RGB space.
  • the matrix circuit 54 converts the second video signal from the XYZ space to the RGB space using the matrix M5.
  • the matrix circuit 54 supplies the R signal, the G signal, and the B signal constituted by the converted second video signal to the gamma correction units 56r, 56g, and 56b, respectively.
  • the gamma correction units 56r, 56g, and 56b perform gamma correction for correcting the video signal based on the gamma characteristic of the video display device 10.
  • the gamma correction units 56r, 56g, and 56b hold lookup tables LUT2r, LUT2g, and LUT2b for performing gamma correction, respectively.
  • the gamma correction unit 56r When the R signal is received from the matrix circuit 54, the gamma correction unit 56r performs gamma correction on the R signal based on the lookup table LUT2r.
  • the gamma correction unit 56g When receiving the G signal from the matrix circuit 54, the gamma correction unit 56g performs gamma correction on the G signal based on the lookup table LUT2g.
  • the gamma correction unit 56b performs gamma correction on the B signal based on the lookup table LUT2b.
  • the gamma correction units 56r, 56g, and 56b supply the second video signals (Rout2, Gout2, and Bout2) subjected to the gamma correction to the data generation unit 57.
  • the data generation unit 57 When the data generation unit 57 receives the second video signal from the gamma correction units 56r, 56g, and 56b, the data generation unit 57 converts the second video signal into a predetermined format and outputs it to the signal processing unit 6 as second video data (seq2). Supply.
  • FIG. 5 is a flowchart showing a processing procedure example of the video display method of the video display device 10.
  • the gamma reverse correction units 41r, 41g, and 41b perform degamma correction on the video signal received by the signal interface 5 (step S911).
  • the matrix circuit 42 converts the video signal from the RGB space to the XYZ space (step S912).
  • the matrix circuit 42 converts the video signal from the RGB space to the XYZ space
  • the matrix circuit 43 converts the converted video signal into the first video signal based on the conversion matrix K1 (step S913).
  • the matrix circuit 42 converts the video signal from the RGB space to the XYZ space
  • the matrix circuit 53 converts the converted video signal into the second video signal based on the conversion matrix K2 (step S914).
  • the matrix circuits 43 and 53 convert the converted video signals into the first and second video signals, respectively
  • the matrix circuits 44 and 54 convert the first and second video signals from the XYZ space to the RGB space, respectively. (Step S915).
  • the limit circuit 45 determines whether or not the first video signal exceeds a predetermined output range (step S916).
  • the limit circuit 45 discards the first video signal (step S917). Further, when the matrix circuit 54 converts the second video signal from the XYZ space to the RGB space, the gamma correction units 56r, 56g, and 56b perform gamma correction on the second video signal, and via the data generation unit 57, The second video data is supplied to the signal processing circuit 6 (step S918).
  • the drive circuit 7 controls the video display device 8 so as to modulate each color light separated by the narrow band filter based on the second video data from the signal processing circuit 6 (step S919).
  • the gamma correction units 46r, 46g, and 46b, and the gamma correction units 56r, 56g, and 56b include the first and second videos.
  • the signal is subjected to gamma correction, and the first and second video data are supplied to the signal processing circuit 6 via the data generators 47 and 57 (step S921).
  • the drive circuit 7 controls the video display device 8 so as to modulate each color light separated by the wide-area filter based on the first video data from the signal processing circuit 6 (step S922).
  • the drive circuit 7 controls the video display device 8 to modulate each color light separated by the narrow band filter based on the second video data from the signal processing circuit 6 (step S923).
  • step S919 or 923 a series of processing procedures of the video display method ends.
  • the color wheel 2 is wider than the first color space and the plurality of first group filters that respectively pass the plurality of first group lights for expressing the first color space. And a plurality of second group filters that respectively pass a plurality of second group lights for expressing the second color space, and the light passing through the first group and second group filters is emitted in a time-sharing manner. To do. For this reason, the video display device 10 has first and second color spaces different from each other.
  • the detector 4 detects whether or not the video indicated by the video signal is in the first color space. Therefore, the video display device 10 can determine whether or not the video shown in the video signal is a color of a video that is frequently projected on the screen.
  • the signal processing circuit 6 detects that the video indicated by the video signal is in the first color space by the detector 4, the first group and the second group The light passing through the filter is incident on the video display device 8.
  • the video display device 10 uses all the light passing through the filters of the first group and the second group when the video shown in the video signal is the color of the video that is projected frequently.
  • the video display device 10 uses the light from the light source 1.
  • the utilization efficiency of the emitted light can be increased. Therefore, the video display apparatus 10 can improve the brightness of the displayed video.
  • the signal processing circuit 6 passes through the second group of filters when the detector 4 detects that the video indicated by the video signal is not in the first color space. Light is incident on the video display device 8.
  • the video display device 10 uses the light passing through the second group of filters with high color purity. Video that cannot be expressed can be reproduced. For this reason, the video display apparatus 10 can maintain high color reproducibility.
  • the video display device 10 combines the first color space and the second color space in accordance with the video signal to suppress a decrease in luminance of the display image while maintaining high color reproducibility. be able to.
  • each of the first group of filters has a wider pass band than each of the second group of filters. For this reason, since the video display apparatus 10 has a second color space wider than the first color space, an image having a color gamut wider than the first color space can be reproduced.
  • the matrix circuit 42 converts the video signal indicating each color value of red, blue, and green from the RGB space to the XYZ space, and the matrix circuit 43 converts the video signal into the first color space. To the third color space of the video signal wider than the first color space. Then, the matrix circuit 44 converts the converted video signal from the XYZ space to the RGB space, and if the limit circuit 45 does not exceed the predetermined output range of each color value of the converted video signal, the video signal Is detected as being in the first color space.
  • the video display device 10 can detect whether or not the video signals indicating the respective color values of red, blue, and green are in the first color space.
  • the video display device 10 measures the color space indicating the optical characteristics of the light source configured by the light passing through the first group of filters and the light source configured by the light passing through the second group of filters.
  • the color gamut assigned to each light source is defined based on the color space.
  • the boundary of the color gamut of each light source is defined in consideration of individual differences of each light source, and basic information is generated based on the defined color gamut. Since the video display device 10 switches the light source using the reference information, the light emitted from the light source 1 can be efficiently converted into color characteristics.
  • the video display apparatus 10 can reduce a decrease in luminance due to correction of the color space.
  • this embodiment may be applied to a display system of the xvYCC standard.
  • This display system is compatible with a conventional video signal, displays an image in an expanded color gamut when an expanded video signal is detected, and displays a conventional video signal when a conventional video signal is input.
  • This is a system that displays video in the color gamut.
  • the configuration of the detector 4 can be simplified when the present embodiment is applied.
  • the color wheel 2 is used to switch between a light source having a color space with a narrow color gamut and a light source having a color space with a wide color gamut has been described.
  • switching to a plurality of light sources is possible. Possible solid light sources or the like may be used.
  • a video display device using a switchable solid-state light source when the video signal does not include an extended area, only a light source with a color space with a narrow color gamut is used, and the entire display period of one image is Assign to the usage time of light source in narrow color space.
  • the extended area when the extended area is included in the video signal, the light source of the color space with a wide color gamut and the light source of the color space with a narrow color gamut are used.
  • the usage time of the light source in a color space with a narrow color gamut is set to a certain ratio. It should be noted that the brightness of the projected image can be adjusted by adjusting the ratio of the usage times of the light source in the color space with a wide color gamut and the light source in the color space with a narrow color gamut.
  • the color wheel 2 a high-pressure mercury lamp and a solid light source may be used.
  • the high-pressure mercury lamp is a light source in a color space with a narrow color gamut
  • the solid light source is a light source in a color space with a wide color gamut.
  • the light source may be switched by widening the pass band of each of the RGB filters and narrowing the pass band of each color light by another one filter.
  • Video display apparatus 1 Light source 2 Color wheel 3 Projection lens 4 Detector 5 Signal interface 6 Signal processing circuit 7 Drive circuit 8 Video display device 9 Synchronous circuit 21-26 Filter 41r, 41g, 41b Gamma reverse correction part 42-44, 53 , 54 Matrix circuit 45 Limit circuit 46r, 46g, 46b, 56r, 56g, 56b Gamma correction unit 47, 57 Data generation unit

Abstract

La présente invention se rapporte à un dispositif d'affichage d'image permettant d'améliorer la luminosité des images affichées. Ledit dispositif d'affichage d'image est pourvu d'une pluralité de filtres de premier groupe (21 à 23) qui permettent le passage d'une pluralité de rayons lumineux de premier groupe pour représenter un premier espace de couleur, respectivement, et d'une pluralité de filtres de second groupe (24 à 26) qui permettent le passage d'une pluralité de rayons lumineux de second groupe pour représenter un second espace de couleur plus important que le premier espace de couleur, respectivement, et qui comprend une roue de couleur pour émettre les rayons lumineux qui sont passés à travers les filtres de premier groupe et de second groupe (21 à 26) au moyen d'une division temporelle, un moyen de détection pour détecter si une image indiquée par un signal d'image est située ou non dans le premier espace de couleur, et un moyen de commande pour amener les rayons lumineux qui sont passés à travers les filtres de premier groupe et de second groupe (21 à 26) à être incidents sur un élément de modulation de lumière si le moyen de détection a détecté que l'image indiquée par le signal d'image est située dans le premier espace de couleur et pour amener les rayons lumineux qui sont passés à travers les filtres de second groupe (24 à 26) à être incidents sur l'élément de modulation de lumière si le moyen de détection a détecté que l'image indiquée par le signal d'image n'est pas située dans le premier espace de couleur.
PCT/JP2010/053865 2010-03-09 2010-03-09 Dispositif d'affichage d'image et procédé d'affichage d'image WO2011111162A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2012504188A JPWO2011111162A1 (ja) 2010-03-09 2010-03-09 映像表示装置および映像表示方法
PCT/JP2010/053865 WO2011111162A1 (fr) 2010-03-09 2010-03-09 Dispositif d'affichage d'image et procédé d'affichage d'image

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PCT/JP2010/053865 WO2011111162A1 (fr) 2010-03-09 2010-03-09 Dispositif d'affichage d'image et procédé d'affichage d'image

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004317528A (ja) * 2003-02-27 2004-11-11 Matsushita Electric Ind Co Ltd カラーホイールとそれを用いた色順次表示装置
JP2005265927A (ja) * 2004-03-16 2005-09-29 Seiko Epson Corp 映像表示装置
JP2007047766A (ja) * 2005-07-11 2007-02-22 Casio Comput Co Ltd 投影型表示装置及びその制御方法と制御プログラム
JP2008026682A (ja) * 2006-07-24 2008-02-07 Mitsubishi Electric Corp 色順次画像表示方法、および色順次画像表示装置
JP2008058897A (ja) * 2006-09-04 2008-03-13 Mitsubishi Electric Corp 色順次画像表示方法、および色順次画像表示装置
JP2009042744A (ja) * 2007-07-13 2009-02-26 Sanyo Electric Co Ltd 照明装置及び投写型映像表示装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004317528A (ja) * 2003-02-27 2004-11-11 Matsushita Electric Ind Co Ltd カラーホイールとそれを用いた色順次表示装置
JP2005265927A (ja) * 2004-03-16 2005-09-29 Seiko Epson Corp 映像表示装置
JP2007047766A (ja) * 2005-07-11 2007-02-22 Casio Comput Co Ltd 投影型表示装置及びその制御方法と制御プログラム
JP2008026682A (ja) * 2006-07-24 2008-02-07 Mitsubishi Electric Corp 色順次画像表示方法、および色順次画像表示装置
JP2008058897A (ja) * 2006-09-04 2008-03-13 Mitsubishi Electric Corp 色順次画像表示方法、および色順次画像表示装置
JP2009042744A (ja) * 2007-07-13 2009-02-26 Sanyo Electric Co Ltd 照明装置及び投写型映像表示装置

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