WO2010109633A1 - Color unevenness correction apparatus and color unevenness correction method - Google Patents

Color unevenness correction apparatus and color unevenness correction method Download PDF

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Publication number
WO2010109633A1
WO2010109633A1 PCT/JP2009/056134 JP2009056134W WO2010109633A1 WO 2010109633 A1 WO2010109633 A1 WO 2010109633A1 JP 2009056134 W JP2009056134 W JP 2009056134W WO 2010109633 A1 WO2010109633 A1 WO 2010109633A1
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WO
WIPO (PCT)
Prior art keywords
color unevenness
correction
color
unevenness correction
correction data
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PCT/JP2009/056134
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French (fr)
Japanese (ja)
Inventor
巳千男 小林
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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 PCT/JP2009/056134 priority Critical patent/WO2010109633A1/en
Priority to JP2011505756A priority patent/JPWO2010109633A1/en
Publication of WO2010109633A1 publication Critical patent/WO2010109633A1/en

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    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/34Control 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
    • G09G3/36Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3607Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00Details of colour television systems
    • H04N9/12Picture reproducers
    • H04N9/31Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3102Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators
    • H04N9/3105Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators for displaying all colours simultaneously, e.g. by using two or more electronic spatial light modulators
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00Details of colour television systems
    • H04N9/12Picture reproducers
    • H04N9/31Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3179Video signal processing therefor
    • H04N9/3182Colour adjustment, e.g. white balance, shading or gamut
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00Control of display operating conditions
    • G09G2320/02Improving the quality of display appearance
    • G09G2320/0242Compensation of deficiencies in the appearance of colours
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00Aspects of the architecture of display systems
    • G09G2360/14Detecting light within display terminals, e.g. using a single or a plurality of photosensors
    • G09G2360/145Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light originating from the display screen

Definitions

  • the present invention relates to a color unevenness correction device and a color unevenness correction method for correcting color unevenness in a video display device, particularly a three-plate projection type liquid crystal display device.
  • a three-plate projection liquid crystal display device that projects and displays a color image on a screen using three liquid crystal panels of red (R), green (G), and blue (B).
  • three liquid crystals are used.
  • color unevenness occurs due to luminance variations in the display screens of the three liquid crystal panels.
  • an apparatus for correcting color unevenness caused by such luminance variations is considered, and is disclosed in, for example, Japanese Patent Application Laid-Open No. 10-84551.
  • FIG. 1 is a block diagram showing an example of a color unevenness correction device used in a three-plate projection type liquid crystal display device, and shows a configuration of one color among red, green, and blue.
  • the color unevenness correction apparatus in this example corrects color unevenness caused by variations in luminance of an input video signal 201 and a VT correction circuit 202 that performs VT correction on the input video signal 201.
  • the color unevenness correction signal generation circuit 206 for generating the color unevenness correction signal for the color unevenness correction signal generated by the color unevenness correction signal generation circuit 206 is determined according to the input H synchronization signal 207 and V synchronization signal 208.
  • Color generation correction signal addition for adding the color unevenness correction signal generated by the color unevenness correction signal generation circuit 206 to the video signal that has been subjected to the VT correction by the timing generation circuit 209 and the VT correction circuit 202 for reading at the timing.
  • the circuit 203 includes a liquid crystal panel 205 and a liquid crystal panel drive circuit 204 that drives the liquid crystal panel 205.
  • the VT correction circuit 202 uses the liquid crystal for the input video signal input 201.
  • the VT correction is performed by converting the voltage-transmittance characteristics of the above into linear characteristics.
  • the VT corrected signal is input to the color unevenness correction signal adding circuit 203 and the color unevenness correction signal generating circuit 206.
  • color unevenness correction signal generation circuit 206 color unevenness correction data obtained from the luminance level of the projected video signal is stored in an internal memory (not shown).
  • the timing generation circuit 209 the H synchronization signal of the video signal is stored.
  • the correction data is read at a timing according to 207 and the V synchronization signal 208.
  • the correction data stored in the memory of the color unevenness correction signal generation circuit 206 is set based on the luminance data obtained by measuring in-plane luminance data for each of the red, green, and blue liquid crystal panels. Then, the color unevenness correction signal adding circuit 203 adds the correction data read from the color unevenness correction signal generating circuit 206 to the video signal that has been VT corrected by the VT correction circuit 202. Thereafter, the liquid crystal panel drive circuit 204 drives the liquid crystal panel 205 based on the signal to which the correction data is added.
  • the brightness unevenness of each liquid crystal panel is reduced by correcting the in-plane brightness distribution for each of the red, green, and blue liquid crystal panels. It is possible to reduce the color unevenness of the image made by combining green and blue.
  • the color unevenness caused by the variation in luminance can be reduced for each of red, green, and blue, but in reality, any one of red, green, and blue is used.
  • color unevenness occurs in which the entire image does not look uniform.
  • the in-plane chromaticity distribution is not strictly uniform in a lamp that is a light source, such color unevenness occurs.
  • optical system elements such as the spectral characteristics of the cross prism in addition to the luminance unevenness due to the liquid crystal panel.
  • the color unevenness is not a single color, for example, in the case where the color unevenness of the blue component occurs in the yellow video generated by the red and green liquid crystal panels, the color unevenness similarly occurs.
  • the present invention has been made in view of the problems of the above-described technology, and in the case of projecting and displaying a color image using a plurality of liquid crystal panels having different colors, the whole of each of a plurality of colors.
  • An object of the present invention is to provide a color unevenness correction apparatus and a color unevenness correction method capable of correcting color unevenness that does not appear to be uniform.
  • Each liquid crystal panel is used in a video display device that projects and displays a color image using a plurality of liquid crystal panels having different colors, and corrects color unevenness in an image projected and displayed using the plurality of liquid crystal panels.
  • a color unevenness correction device comprising a plurality of color unevenness correction means provided corresponding to each of the above, Each of the plurality of uneven color correction means includes The first correction data for correcting the color unevenness using the color of the liquid crystal panel corresponding to the other color unevenness correction means is requested to the other color unevenness correction means, and the other color unevenness correction means requests the first correction data.
  • First correction signal generating means for outputting the first correction data when one correction data is requested; Adding means for adding the first correction data output from the first correction signal generating means to the input video signal;
  • each of the color unevenness correction means requests the other color unevenness correction means for the first correction data for correcting the color unevenness using the color of the liquid crystal panel corresponding to the other color unevenness correction means.
  • the first correction signal generating means for outputting the first correction data, and the input video signal is output from the first correction signal generating means.
  • adding means for adding the first correction data, and the first correction data for correcting the color unevenness is input.
  • FIG. 3 is a diagram illustrating a configuration of a color unevenness correction signal generation circuit illustrated in FIG. 2. It is a block diagram which shows the structure of the video display apparatus with which other embodiment of the color nonuniformity correction apparatus of this invention was used.
  • FIG. 5 is a diagram illustrating a configuration of a color unevenness correction signal generation circuit illustrated in FIG. 4.
  • FIG. 2 is a block diagram showing a configuration of a video display device in which an embodiment of the uneven color correction device of the present invention is used.
  • an image display for projecting and displaying a color image on a screen using three liquid crystal panels 5a to 5c having red (R), green (G), and blue (B) colors. It is used in a three-plate projection type liquid crystal display device, which is a device, and is composed of three color unevenness correction units 13a to 13c provided corresponding to the three liquid crystal panels 5a to 5c, respectively.
  • the liquid crystal panels 5a to 5c are driven by the liquid crystal panel drive circuit 4a.
  • the color unevenness correction unit 13a is provided corresponding to the red liquid crystal panel 5a, and includes a VT correction circuit 2a that performs VT correction on the input red video signal 1a, and the input red video signal 1a.
  • Color unevenness correction signal generating circuit 6a which is a second correction signal generating means for generating luminance unevenness correction data to be second correction data for correcting the brightness unevenness with respect to, and the input red video signal 1a.
  • Color unevenness correction data serving as first data for correcting color unevenness using green is requested to the color unevenness correcting unit 13b provided corresponding to the green liquid crystal panel 5b, and the color unevenness correcting unit.
  • Color unevenness correction data serving as the first data for correcting the color unevenness of the green video signal 1b input to the color unevenness correcting unit 13b from red is used from 13b
  • the color unevenness is requested.
  • Color unevenness correction signal generating circuit 7a which is a first correction signal generating means for outputting correction data, and a color that becomes first data for correcting the color unevenness of the input red video signal 1a using blue.
  • the uneven color correction data is requested to the color unevenness correction unit 13c provided corresponding to the blue liquid crystal panel 5c, and the blue image signal 1c input to the color unevenness correction unit 13c from the color unevenness correction unit 13c is requested.
  • a color unevenness correction signal generating circuit which is a first correction signal generating means for outputting color unevenness correction data when color unevenness correction data serving as first data for correcting color unevenness using red is requested.
  • 8a and luminance unevenness correction data generated by the color unevenness correction signal generation circuit 6a and color unevenness correction data generated by the color unevenness correction signal generation circuits 7a and 8a are input to the H synchronization signal 11a and A timing generation circuit 9a for reading out at a timing according to the V synchronization signal 12a, luminance unevenness correction data generated by the color unevenness correction signal generation circuit 6a, and a video signal corrected by VT by the VT correction circuit 2a;
  • the color unevenness correction signal adding circuit 3a adds color unevenness correction data generated by the color unevenness correction signal generating circuits 7a and 8a.
  • the color unevenness correction unit 13b is provided corresponding to the green liquid crystal panel 5b, and includes a VT correction circuit 2b that performs VT correction on the input green video signal 1b, and an input green video signal 1b.
  • Color unevenness correction signal generating circuit 6b which is a second correction signal generating means for generating luminance unevenness correction data to be second correction data for correcting luminance unevenness, and an input green video signal 1b.
  • Color unevenness correction data serving as first data for correcting color unevenness using blue is requested to the color unevenness correcting unit 13c provided corresponding to the blue liquid crystal panel 5c, and the color unevenness correcting unit.
  • Color unevenness correction data serving as the first data for correcting the color unevenness of the blue video signal 1c input to the color unevenness correcting unit 13c from green is used from 13c, the color unevenness is requested.
  • Color unevenness correction signal generating circuit 7b which is a first correction signal generating means for outputting correction data, and a color that becomes the first data for correcting the color unevenness of the input green video signal 1b using red.
  • the color unevenness correction data is requested to the color unevenness correction unit 13a, and the color unevenness of the red video signal 1a input from the color unevenness correction unit 13a to the color unevenness correction unit 13a is corrected using green.
  • Is generated by the color unevenness correction signal generation circuit 8b and the color unevenness correction signal generation circuit 6b which are the first correction signal generation means for outputting the color unevenness correction data when the color unevenness correction data to be the color data is requested.
  • Brightness unevenness correction data and color unevenness correction signal generated by the color unevenness correction signal generation circuits 7b and 8b are read at a timing according to the input H synchronization signal 11b and V synchronization signal 12b.
  • Luminance generation correction data generated by the color unevenness correction signal generation circuit 6b and the color unevenness correction signal generation circuits 7b and 8b are added to the video signal VT corrected by the timing generation circuit 9b and the VT correction circuit 2b.
  • the color unevenness correction signal adding circuit 3b for adding the color unevenness correction data generated in (1).
  • the uneven color correction unit 13c is provided corresponding to the blue liquid crystal panel 5c, and includes a VT correction circuit 2c that performs VT correction on the input blue video signal 1c, and the input blue video signal 1c.
  • Color unevenness correction signal generating circuit 6c which is a second correction signal generating means for generating luminance unevenness correction data to be second correction data for correcting brightness unevenness, and an input blue video signal 1c.
  • the color unevenness correction data that is the first data for correcting the color unevenness using red is requested to the color unevenness correction unit 13a, and the red color input from the color unevenness correction unit 13a to the color unevenness correction unit 13a.
  • the first correction signal generator that outputs the color unevenness correction data is requested.
  • the color unevenness correction signal generation circuit 7c and the color unevenness correction unit 13b are requested to obtain color unevenness correction data as first data for correcting the color unevenness of the input blue video signal 1c using green.
  • the color unevenness correction unit 13b requested color unevenness correction data serving as first data for correcting the color unevenness of the green video signal 1b input to the color unevenness correction unit 13b using blue.
  • the color unevenness correction signal generation circuit 8c which is the first correction signal generation means for outputting the color unevenness correction data, and the luminance unevenness correction data and the color unevenness correction signal generation circuit generated by the color unevenness correction signal generation circuit 6c.
  • a timing generation circuit 9c for reading the color unevenness correction data generated in 7c and 8c at a timing according to the input H synchronization signal 11c and V synchronization signal 12c, and a VT compensation The luminance unevenness correction data generated by the color unevenness correction signal generation circuit 6c and the color unevenness correction data generated by the color unevenness correction signal generation circuits 7c and 8c are added to the video signal that has been VT corrected by the circuit 2c.
  • the color unevenness correction signal adding circuit 3c is constituted.
  • the red video signal 1a, the green video signal 1b, and the blue video signal 1c are input to the color unevenness correction units 13a to 13c, respectively, the input red video signal 1a, green video signal 1b, and VT correction is performed by converting the voltage-transmittance characteristics of the liquid crystal into linear characteristics for the blue video signal 1c.
  • the VT corrected signal is input to the color unevenness correction signal adding circuits 3a to 3c and the color unevenness correction signal generating circuits 6a to 6c, respectively.
  • luminance nonuniformity correction data obtained from the luminance level of the projected video signal is stored in an internal memory (not shown).
  • the timing generation circuits 9a to 9c the video signal The correction data is read at a timing according to the H synchronization signals 7a to 7c and the V synchronization signals 8a to 8c.
  • the brightness unevenness correction data stored in the memories of the color unevenness correction signal generation circuits 6a to 6c are measured in the plane for each of the red, green, and blue liquid crystal panels 5a to 5c, and based on the brightness data. Is set.
  • the red video signal 1a, the green video signal 1b, and the blue video signal 1c respectively input to the color unevenness correction units 13a to 13c are input to the color unevenness correction signal generation circuits 7a and 8a in the color unevenness correction unit 13a.
  • the color unevenness correction unit 13b inputs the color unevenness correction signal generation circuits 7b and 8b
  • the color unevenness correction unit 13c inputs the color unevenness correction signal generation circuits 7c and 8c.
  • FIG. 3 is a diagram showing a configuration of the color unevenness correction signal generation circuit 7a shown in FIG.
  • the configuration of the color unevenness correction signal generation circuits 7b, 7c, 8a to 8c shown in FIG. 2 is the same as this.
  • the uneven color correction signal generation circuits 7a to 7c and 8a to 8c shown in FIG. 2 include a look-up table 14 as storage means, a correction data request unit 15 as correction signal request means, The correction data generation unit 18 is configured.
  • the lookup table 14 stores correction data for correcting color unevenness in images displayed using the liquid crystal panels 5a to 5c for each of the color unevenness correction signal generation circuits 7a to 7c and 8a to 8c. .
  • images displayed using the liquid crystal panels 5a to 5c are taken in advance using a color camera or the like, and correction data is set so as to eliminate color unevenness.
  • the video display screen projected and displayed from the liquid crystal panels 5a to 5c is divided into a plurality of blocks, and the color unevenness is measured for each block.
  • the in-plane chromaticity distribution of each of red, green, and blue is strictly, for example, in a lamp that is a light source.
  • color unevenness occurs that the whole color does not appear to be uniform. Therefore, for example, when red is displayed in a single color using the liquid crystal panel 5a for each of the plurality of divided blocks, the color is changed using other colors so that the entire color becomes uniform with other green and blue.
  • a correction amount for correcting the unevenness is generated. This also corresponds to the brightness of the input video signal.
  • the color unevenness correction signal generation circuit 7a of the color unevenness correction unit 13a the red video input for each of the plurality of blocks described above.
  • An amplitude sufficient to correct color unevenness using green is set according to the brightness of the signal 1a, and the color unevenness correction signal generation circuit 8a is input to each of the plurality of blocks described above.
  • an amplitude sufficient to correct color unevenness using blue is set.
  • the color unevenness correction signal generation circuit 7b of the color unevenness correction unit 13b corrects the color unevenness using blue for each of the plurality of blocks described above according to the brightness of the input green video signal 1b.
  • the color unevenness correction signal generation circuit 8b the color unevenness using red is determined for each of the plurality of blocks according to the brightness of the input green video signal 1b. A sufficient amplitude is set to correct Further, the color unevenness correction signal generation circuit 7c of the color unevenness correction unit 13c corrects color unevenness using red for each of the plurality of blocks described above according to the brightness of the input blue video signal 1c. In the color unevenness correction signal generation circuit 8c, for each of the plurality of blocks described above, the color unevenness using green according to the brightness of the input blue video signal 1c. A sufficient amplitude is set to correct As the number of blocks divided as described above increases, finer control becomes possible, but the amount of information stored in the lookup table 14 becomes enormous. For this reason, the block data is held to some extent discretely, and interpolation is performed on the data between the blocks, thereby enabling fine control without making the amount of information stored in the lookup table 14 enormous. it can.
  • the color unevenness correction signal generation circuits 7a and 8a refer to the look-up table 14 and the brightness of the input red video signal 1a. Accordingly, correction data for correcting the color unevenness of the red video signal 1a is requested.
  • the look-up table 14 of the color unevenness correction signal generation circuit 7a has an amplitude sufficient to correct color unevenness using green according to the brightness of the input red video signal 1a. Since the amount is set for each of the plurality of blocks, the correction data requesting unit 15 of the color unevenness correction signal generating circuit 7a determines the red video for each of the plurality of blocks according to the brightness of the input red video signal 1a.
  • the color unevenness correction unit 13b is requested to output green color unevenness correction data having an amplitude for correcting the color unevenness of the signal 1a.
  • the look-up table 14 of the color unevenness correction signal generation circuit 8a has an amplitude sufficient to correct color unevenness using blue according to the brightness of the input red video signal 1a. Since it is set for each of the plurality of blocks, the correction data requesting unit 15 of the color unevenness correction signal generating circuit 8a determines the red video signal 1a for each of the plurality of blocks according to the brightness of the input red video signal 1a.
  • the color unevenness correction unit 13c is requested to output blue color unevenness correction data having an amplitude for correcting the color unevenness.
  • the look-up table 14 of the color unevenness correction signal generation circuit 7b has an amplitude sufficient to correct the color unevenness using blue according to the brightness of the input green video signal 1b.
  • the correction data requesting unit 15 of the color unevenness correction signal generating circuit 7b is set according to the brightness of the input green video signal 1b for each of the plurality of blocks.
  • the color unevenness correction unit 13c is requested to output the color unevenness correction data in blue having an amplitude for correcting the color unevenness of the green video signal 1b.
  • the correction data requesting unit 15 of the color unevenness correction signal generating circuit 8b determines the green video signal 1b for each of the plurality of blocks according to the brightness of the input green video signal 1b.
  • the color unevenness correction unit 13a is requested to output red color unevenness correction data having an amplitude for correcting the color unevenness.
  • the look-up table 14 of the color unevenness correction signal generation circuit 7c has an amplitude sufficient to correct color unevenness using red according to the brightness of the input blue video signal 1c. Is set for each of the plurality of blocks as the correction amount, the correction data requesting unit 15 of the color unevenness correction signal generating circuit 7c is set for each of the plurality of blocks according to the brightness of the input blue video signal 1c. The color unevenness correction unit 13a is requested to output red color unevenness correction data having an amplitude for correcting the color unevenness of the blue video signal 1c.
  • the correction data requesting unit 15 of the color unevenness correction signal generating circuit 8c determines the blue video signal 1c for each of the plurality of blocks according to the brightness of the input blue video signal 1c.
  • the color unevenness correction unit 13a is requested to output green color unevenness correction data having an amplitude for correcting the color unevenness.
  • the color unevenness correction signal generation circuits 7a to 7c and 8a to 8c are requested to output the color unevenness correction data to the different color unevenness correction units 13a to 13c, the color that has received this request.
  • the unevenness correction units 13a to 13c in the correction data generation unit 18 of the color unevenness correction signal generation circuits 7a to 7c and 8a to 8c, the color according to the request from the color unevenness correction signal generation circuits 7a to 7c and 8a to 8c. Unevenness correction data is generated.
  • the correction data in red whose amplitude is designated for each of the plurality of blocks described above from the color unevenness correction signal generation circuit 8b of the color unevenness correction unit 13b. Is output for each of a plurality of blocks in response to the request, the color unevenness correction data in red having the amplitude requested from the color unevenness correction signal generation circuit 8b is generated.
  • the correction data generation unit 18 of the color unevenness correction signal generation circuit 8a correction is performed in red from the color unevenness correction signal generation circuit 7c of the color unevenness correction unit 13c with the amplitude specified for each of the plurality of blocks described above. Since it is requested to output data, in response to the request, the color unevenness correction data in red having the amplitude requested from the color unevenness correction signal generation circuit 7c is generated for each of the plurality of blocks.
  • the correction is performed in green in which the amplitude is designated for each of the plurality of blocks from the color unevenness correction signal generation circuit 7a of the color unevenness correction unit 13a. Since it is requested to output data, in response to the request, color unevenness correction data in green having the amplitude requested from the color unevenness correction signal generation circuit 7a is generated for each of a plurality of blocks.
  • the correction data in blue in which the amplitude is designated for each of the plurality of blocks from the color unevenness correction signal generation circuit 8a of the color unevenness correction unit 13a Is output for each of a plurality of blocks in response to the request, and color unevenness correction data for blue having the amplitude requested from the color unevenness correction signal generation circuit 8a is generated.
  • the color unevenness correction signal generation circuit 7b of the color unevenness correction unit 13b corrects with blue whose amplitude is designated for each of the plurality of blocks described above. Since it is requested to output data, in response to the request, color unevenness correction data in blue having the amplitude requested from the color unevenness correction signal generation circuit 7b is generated for each of a plurality of blocks.
  • the color unevenness correction data generated in this way is the H synchronization signal 7a of the video signal in the timing generation circuits 9a to 9c, similarly to the luminance unevenness correction data stored in the memories of the color unevenness correction signal generation circuits 6a to 6c.
  • To 7c and V synchronization signals 8a to 8c are read at timings.
  • the luminance unevenness correction data read from the color unevenness correction signal generating circuits 6a to 6c are converted into the video signals that have been subjected to VT correction in the VT correction circuits 2a to 2c.
  • the uneven color correction data read from the uneven color correction signal generation circuits 7a to 7c and 8a to 8c are added.
  • the luminance unevenness correction signal addition circuits 3a to 3c read the luminance unevenness correction data read from the color unevenness correction signal generation circuits 6a to 6c and the color unevenness correction signal generation circuits 7a to 7c and 8a to 8c.
  • the liquid crystal panel drive circuits 4a to 4c drive the liquid crystal panels 5a to 5c based on the video signal added with the color unevenness correction data, and are projected through the red, green, and blue liquid crystal panels 5a to 5c. The images are combined and a color image is displayed.
  • the luminance unevenness correction signals output from the color unevenness correction signal generating circuits 6a to 6c are added to the video signals output from the color unevenness correction signal adding circuits 3a to 3c, the red video signal 1a, Since the luminance unevenness due to the green video signal 1b and the blue video signal 1c is corrected, and the color unevenness correction signals output from the color unevenness correction signal generation circuits 7a to 7c and 8a to 8c are added, the red video signal 1a The color unevenness due to the single color of the green video signal 1b and the blue video signal 1c is corrected.
  • the color unevenness due to the single color of the red video signal 1a is corrected in the green and blue images projected via the liquid crystal panels 5b and 5c. Therefore, when the color unevenness correction data of green and blue and the image of red projected through the liquid crystal panel 5a are combined, the single color of the red video signal 1a is included. The color unevenness is corrected and the entire color becomes uniform.
  • the color unevenness due to the single color of the green video signal 1b is corrected in the red and blue images projected through the liquid crystal panels 5a and 5c. Therefore, when the color unevenness correction data of red and blue and the image of green projected through the liquid crystal panel 5b are combined, a single color of the green video signal 1b is included. The color unevenness is corrected and the entire color becomes uniform.
  • the color unevenness due to the single color of the blue video signal 1c is corrected in the red and green images projected via the liquid crystal panels 5a and 5b. Therefore, when the color unevenness correction data of red and green and the image of blue projected through the liquid crystal panel 5c are combined, a single color of the blue video signal 1c is included. The color unevenness is corrected and the entire color becomes uniform.
  • the color unevenness correction signal generation circuits 7a to 7c and 8a to 8c signal levels before VT correction by the VT correction circuits 2a to 2c are used. This is because the VT correction in the VT correction circuits 2a to 2c converts the voltage-transmittance characteristics of the liquid crystal into linear characteristics for the input red video signal 1a, green video signal 1b and blue video signal 1c. As a result, the VT-corrected signal includes the characteristics of the liquid crystal panels 5a to 5c, while the single color unevenness of the red video signal 1a, the green video signal 1b, and the blue video signal 1c is included in the optical system. This is because color unevenness correction does not depend on the characteristics of the liquid crystal panels 5a to 5c.
  • FIG. 4 is a block diagram showing a configuration of a video display apparatus in which another embodiment of the color unevenness correction apparatus of the present invention is used.
  • FIG. 5 is a diagram showing a configuration of the color unevenness correction signal generation circuit 107a shown in FIG.
  • the configuration of the color unevenness correction signal generation circuits 107b, 107c, 108a to 108c shown in FIG. 4 is the same as this.
  • each of the color unevenness correction units 113a to 113c further includes two amplitude control circuits 116a to 116c and 117a to 117c.
  • the amplitude control circuits 116a to 116c and 117a to 117c can be configured by, for example, multipliers.
  • the color unevenness correction signals 107a to 107c in the present embodiment are composed of a look-up table 114 as storage means, a correction data request section 115 as correction signal request means, and a correction data generation section 118. ing.
  • the look-up table 114 corrects color unevenness in an image displayed using the liquid crystal panels 105a to 105c for each of the color unevenness correction signal generation circuits 107a to 107c and 108a to 108c.
  • the correction data stored in the look-up table 114 in this embodiment does not correspond to the brightness of the input video signal. Therefore, one correction data is stored for each of the plurality of blocks described above.
  • the amplitude control circuits 116a to 116c and 117a to 117c send the requested correction data to the input video signal. Specify the corresponding amplitude.
  • the amplitude control circuit 116a the input red video signal for the correction data requested to the color unevenness correction signal generation circuit 108b of the color unevenness correction unit 113b by the color unevenness correction signal generation circuit 107a.
  • an amplitude is specified so that the color unevenness due to a single color of the red video signal 101a is corrected.
  • the correction data requested to the color unevenness correction signal generation circuit 107c of the color unevenness correction unit 113c by the color unevenness correction signal generation circuit 108a is applied to the input red video signal 101a.
  • an amplitude is specified such that the color unevenness due to the single color of the red video signal 101a is corrected.
  • the amplitude control circuit 116b the brightness of the input green video signal 101b with respect to the correction data requested to the color unevenness correction signal generation circuit 108c of the color unevenness correction unit 113c by the color unevenness correction signal generation circuit 107b. Accordingly, the amplitude is specified so that the color unevenness due to the single color of the green video signal 101b is corrected.
  • the correction data requested to the color unevenness correction signal generation circuit 107a of the color unevenness correction unit 113a in the color unevenness correction signal generation circuit 108b is applied to the input green video signal 101b. In accordance with the brightness, an amplitude is specified such that the color unevenness due to a single color of the green video signal 101a is corrected.
  • the amplitude control circuit 116c the brightness of the input blue video signal 101c with respect to the correction data requested to the color unevenness correction signal generation circuit 108a of the color unevenness correction unit 113a by the color unevenness correction signal generation circuit 107c. Accordingly, the amplitude is specified so that the color unevenness due to the single color of the blue video signal 101c is corrected.
  • the correction data requested to the color unevenness correction signal generation circuit 107b of the color unevenness correction unit 113b by the color unevenness correction signal generation circuit 108c is applied to the input blue video signal 101c. In accordance with the brightness, an amplitude is specified such that the color unevenness due to the single color of the blue video signal 101c is corrected.
  • the look-up table 114 corrects color unevenness in an image displayed using the liquid crystal panels 105a to 105c for each of the color unevenness correction signal generation circuits 107a to 107c and 108a to 108c. Since only one correction data is stored for each of the plurality of blocks described above, the amount of data stored in the lookup table 114 can be reduced.

Abstract

A color unevenness correction device is composed of a plurality of color unevenness correction units (13a to 13c). The color unevenness correction units (13a to 13c) comprise color unevenness correction signal generation circuits (7a to 7c, 8a to 8c) and color unevenness correction signal adding circuits (3a to 3c). An amplitude as a correction amount is set in the color unevenness correction signal generation circuits (7a to 7c, 8a to 8c) such that the correction amount is sufficient to correct color unevenness in an image projected and displayed using a liquid crystal panel (5a to 5c) corresponding to a concerned color unevenness correction unit (13a to 13c) by use of the color of the liquid crystal panel (5a to 5c) corresponding to another color unevenness correction unit (13a to 13c). The color unevenness correction signal generation circuit (7a to 7c, 8a to 8c) outputs the correction amount to another color unevenness correction unit (13a to 13c) and when a correction amount is inputted from another color unevenness correction unit (13a to 13c), outputs color unevenness correction data. An color unevenness correction signal adding circuit (3a to 3c) adds to an inputted image signal the color unevenness correction data outputted from the color unevenness correction signal generation circuit (7a to 7c, 8a to 8c).

Description

色むら補正装置及び色むら補正方法Color unevenness correction apparatus and color unevenness correction method
 本発明は、映像表示装置、特に3板式投射型液晶表示装置における色むらを補正する色むら補正装置及び色むら補正方法に関する。 The present invention relates to a color unevenness correction device and a color unevenness correction method for correcting color unevenness in a video display device, particularly a three-plate projection type liquid crystal display device.
 一般的に、赤色(R)、緑色(G)、青色(B)の3枚の液晶パネルを用いてスクリーン上にカラー画像を投写表示する3板式投射型液晶表示装置においては、3枚の液晶パネルが重ね合わされた際に、3枚の液晶パネルの表示画面における輝度のばらつきによって色むらが生じる。そこで、このような輝度のばらつきによって生じる色むらを補正する装置が考えられており、例えば、特開平10-84551号公報に開示されている。 Generally, in a three-plate projection liquid crystal display device that projects and displays a color image on a screen using three liquid crystal panels of red (R), green (G), and blue (B), three liquid crystals are used. When the panels are overlaid, color unevenness occurs due to luminance variations in the display screens of the three liquid crystal panels. In view of this, an apparatus for correcting color unevenness caused by such luminance variations is considered, and is disclosed in, for example, Japanese Patent Application Laid-Open No. 10-84551.
 図1は、3板式投射型液晶表示装置に用いる色むら補正装置の一例を示すブロック図であり、赤色、緑色、青色のうち1色の構成について示す。 FIG. 1 is a block diagram showing an example of a color unevenness correction device used in a three-plate projection type liquid crystal display device, and shows a configuration of one color among red, green, and blue.
 本例における色むら補正装置は図1に示すように、入力された映像信号201をV-T補正するVT補正回路202と、入力された映像信号201について輝度のばらつきによって生じる色むらを補正するための色むら補正信号を発生させる色むら補正信号発生回路206と、色むら補正信号発生回路206にて発生する色むら補正信号を、入力されるH同期信号207及びV同期信号208に応じたタイミングで読み出すためのタイミング発生回路209と、VT補正回路202にてV-T補正された映像信号に、色むら補正信号発生回路206にて発生した色むら補正信号を加算する色むら補正信号加算回路203と、液晶パネル205と、液晶パネル205を駆動する液晶パネル駆動回路204とから構成されている。 As shown in FIG. 1, the color unevenness correction apparatus in this example corrects color unevenness caused by variations in luminance of an input video signal 201 and a VT correction circuit 202 that performs VT correction on the input video signal 201. The color unevenness correction signal generation circuit 206 for generating the color unevenness correction signal for the color unevenness correction signal generated by the color unevenness correction signal generation circuit 206 is determined according to the input H synchronization signal 207 and V synchronization signal 208. Color generation correction signal addition for adding the color unevenness correction signal generated by the color unevenness correction signal generation circuit 206 to the video signal that has been subjected to the VT correction by the timing generation circuit 209 and the VT correction circuit 202 for reading at the timing. The circuit 203 includes a liquid crystal panel 205 and a liquid crystal panel drive circuit 204 that drives the liquid crystal panel 205.
 上記のように構成された色むら補正回路は、赤色、緑色、青色のうちいずれか1色の映像信号入力201が入力されると、VT補正回路202において、入力された映像信号入力201について液晶の電圧-透過率特性をリニアな特性に変換することでV-T補正を行う。このV-T補正された信号は、色むら補正信号加算回路203と色むら補正信号発生回路206に入力される。色むら補正信号発生回路206においては、投写した映像信号の輝度レベルから求めた色むら補正データが内部のメモリ(不図示)に記憶されており、タイミング発生回路209において、映像信号のH同期信号207及びV同期信号208に応じたタイミングでこの補正データを読み出す。この色むら補正信号発生回路206のメモリに記憶された補正データは、赤色、緑色、青色の液晶パネル毎に面内の輝度データが測定され、その輝度データに基づいて設定されている。そして、色むら補正信号加算回路203において、VT補正回路202にてV-T補正された映像信号に色むら補正信号発生回路206から読み出された補正データを加算する。その後、補正データが加算された信号に基づいて液晶パネル駆動回路204が液晶パネル205を駆動する。 In the color unevenness correction circuit configured as described above, when the video signal input 201 of any one of red, green, and blue is input, the VT correction circuit 202 uses the liquid crystal for the input video signal input 201. The VT correction is performed by converting the voltage-transmittance characteristics of the above into linear characteristics. The VT corrected signal is input to the color unevenness correction signal adding circuit 203 and the color unevenness correction signal generating circuit 206. In the color unevenness correction signal generation circuit 206, color unevenness correction data obtained from the luminance level of the projected video signal is stored in an internal memory (not shown). In the timing generation circuit 209, the H synchronization signal of the video signal is stored. The correction data is read at a timing according to 207 and the V synchronization signal 208. The correction data stored in the memory of the color unevenness correction signal generation circuit 206 is set based on the luminance data obtained by measuring in-plane luminance data for each of the red, green, and blue liquid crystal panels. Then, the color unevenness correction signal adding circuit 203 adds the correction data read from the color unevenness correction signal generating circuit 206 to the video signal that has been VT corrected by the VT correction circuit 202. Thereafter, the liquid crystal panel drive circuit 204 drives the liquid crystal panel 205 based on the signal to which the correction data is added.
 このように、図1に示した色むら補正装置においては、赤色、緑色、青色の液晶パネル毎に面内の輝度分布を補正することにより各液晶パネルの輝度むらを減少させ、それにより、赤色、緑色、青色が合成されて作られる映像の色むらを軽減することが可能となっている。 As described above, in the color unevenness correction apparatus shown in FIG. 1, the brightness unevenness of each liquid crystal panel is reduced by correcting the in-plane brightness distribution for each of the red, green, and blue liquid crystal panels. It is possible to reduce the color unevenness of the image made by combining green and blue.
 ところが、上述したような3板式投射型液晶表示装置においては、赤色、緑色、青色それぞれについて輝度のばらつきによって生じる色むらを減少させることはできるものの、現実には、赤色、緑色、青色のいずれか単色を表示させた場合に全体が均一な色に見えないという色むらが発生する。例えば、光源であるランプにおいて面内の色度分布が厳密には一様でない場合にこのような色むらが発生する。これは、色むらが、液晶パネルに起因する輝度むらの他に、クロスプリズムの分光特性等の光学系要素に起因するものであるためである。また、単色でなくても、例えば、赤色と緑色の液晶パネルで生成される黄色映像について、青色成分の色むらが発生していた場合についても同様に色むらが発生する。 However, in the above-described three-plate projection type liquid crystal display device, the color unevenness caused by the variation in luminance can be reduced for each of red, green, and blue, but in reality, any one of red, green, and blue is used. When a single color is displayed, color unevenness occurs in which the entire image does not look uniform. For example, when the in-plane chromaticity distribution is not strictly uniform in a lamp that is a light source, such color unevenness occurs. This is because the color unevenness is caused by optical system elements such as the spectral characteristics of the cross prism in addition to the luminance unevenness due to the liquid crystal panel. Even if the color is not a single color, for example, in the case where the color unevenness of the blue component occurs in the yellow video generated by the red and green liquid crystal panels, the color unevenness similarly occurs.
 本発明は、上述した技術が有する問題点に鑑みてなされたものであって、互いに異なる色を具備する複数の液晶パネルを用いてカラー画像を投写表示する場合に、複数の色のそれぞれにおいて全体が均一な色に見えない色むらを補正することができる色むら補正装置及び色むら補正方法を提供することを目的とする。 The present invention has been made in view of the problems of the above-described technology, and in the case of projecting and displaying a color image using a plurality of liquid crystal panels having different colors, the whole of each of a plurality of colors. An object of the present invention is to provide a color unevenness correction apparatus and a color unevenness correction method capable of correcting color unevenness that does not appear to be uniform.
 上記目的を達成するために本発明は、
 互いに異なる色を具備する複数の液晶パネルを用いてカラー画像を投写表示する映像表示装置に用いられ、前記複数の液晶パネルを用いて投写表示される画像における色むらを補正するために各液晶パネルのそれぞれに対応して設けられた複数の色むら補正手段からなる色むら補正装置であって、
 前記複数の色むら補正手段のそれぞれは、
 他の色むら補正手段に対応する液晶パネルの色を用いて前記色むらを補正するための第1の補正データを前記他の色むら補正手段に要求し、他の色むら補正手段から前記第1の補正データが要求された場合に該第1の補正データを出力する第1の補正信号発生手段と、
 入力された映像信号に、前記第1の補正信号発生手段から出力された第1の補正データを加算する加算手段とを有する。
In order to achieve the above object, the present invention provides:
Each liquid crystal panel is used in a video display device that projects and displays a color image using a plurality of liquid crystal panels having different colors, and corrects color unevenness in an image projected and displayed using the plurality of liquid crystal panels. A color unevenness correction device comprising a plurality of color unevenness correction means provided corresponding to each of the above,
Each of the plurality of uneven color correction means includes
The first correction data for correcting the color unevenness using the color of the liquid crystal panel corresponding to the other color unevenness correction means is requested to the other color unevenness correction means, and the other color unevenness correction means requests the first correction data. First correction signal generating means for outputting the first correction data when one correction data is requested;
Adding means for adding the first correction data output from the first correction signal generating means to the input video signal;
 以上説明したように本発明においては、互いに異なる色を具備する複数の液晶パネルにを用いて投写表示される画像における色むらを補正するために各液晶パネルのそれぞれに対応して設けられた複数の色むら補正手段のそれぞれが、他の色むら補正手段に対応する液晶パネルの色を用いて色むらを補正するための第1の補正データを他の色むら補正手段に要求し、他の色むら補正手段から第1の補正データが要求された場合にその第1の補正データを出力する第1の補正信号発生手段と、入力された映像信号に、第1の補正信号発生手段から出力された第1の補正データを加算する加算手段とを有する構成とし、色むらが発生した色とは異なる他の色からなり、この色むらを補正するための第1の補正データが入力された映像信号に加算されるので、複数の液晶パネルを介して投写された画像が合成されると、この加算された第1の補正データの色によって色むらが補正されることになり、それにより、互いに異なる色を具備する複数の液晶パネルを用いてカラー画像を投写表示する場合に、複数の色のそれぞれにおいて全体が均一な色に見えない色むらを補正することができる。 As described above, in the present invention, in order to correct color unevenness in an image projected and displayed using a plurality of liquid crystal panels having different colors, a plurality of liquid crystal panels provided corresponding to each of the liquid crystal panels. Each of the color unevenness correction means requests the other color unevenness correction means for the first correction data for correcting the color unevenness using the color of the liquid crystal panel corresponding to the other color unevenness correction means. When the first correction data is requested from the color unevenness correcting means, the first correction signal generating means for outputting the first correction data, and the input video signal is output from the first correction signal generating means. And adding means for adding the first correction data, and the first correction data for correcting the color unevenness is input. Add to video signal Therefore, when the images projected through the plurality of liquid crystal panels are combined, the color unevenness is corrected by the color of the added first correction data, thereby providing different colors. When a color image is projected and displayed using a plurality of liquid crystal panels, color unevenness that does not appear to be uniform as a whole can be corrected for each of the plurality of colors.
3板式投射型液晶表示装置に用いる色むら補正装置の一例を示すブロック図である。It is a block diagram which shows an example of the color nonuniformity correction apparatus used for 3 plate type | mold projection-type liquid crystal display device. 本発明の色むら補正装置の実施の一形態が用いられた映像表示装置の構成を示すブロック図である。It is a block diagram which shows the structure of the video display apparatus with which one Embodiment of the color nonuniformity correction apparatus of this invention was used. 図2に示した色むら補正信号発生回路の構成を示す図である。FIG. 3 is a diagram illustrating a configuration of a color unevenness correction signal generation circuit illustrated in FIG. 2. 本発明の色むら補正装置の他の実施の形態が用いられた映像表示装置の構成を示すブロック図である。It is a block diagram which shows the structure of the video display apparatus with which other embodiment of the color nonuniformity correction apparatus of this invention was used. 図4に示した色むら補正信号発生回路の構成を示す図である。FIG. 5 is a diagram illustrating a configuration of a color unevenness correction signal generation circuit illustrated in FIG. 4.
発明を実施するための形態BEST MODE FOR CARRYING OUT THE INVENTION
 以下に、本発明の実施の形態について図面を参照して説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
 図2は、本発明の色むら補正装置の実施の一形態が用いられた映像表示装置の構成を示すブロック図である。 FIG. 2 is a block diagram showing a configuration of a video display device in which an embodiment of the uneven color correction device of the present invention is used.
 本形態は図2に示すように、赤色(R)、緑色(G)、青色(B)の色を有する3枚の液晶パネル5a~5cを用いてスクリーン上にカラー画像を投写表示する映像表示装置である3板式投射型液晶表示装置に用いられ、3枚の液晶パネル5a~5cにそれぞれ対応して設けられた3つの色むら補正部13a~13cから構成されている。なお、液晶パネル5a~5cは、液晶パネル駆動回路4aによって駆動する。 In this embodiment, as shown in FIG. 2, an image display for projecting and displaying a color image on a screen using three liquid crystal panels 5a to 5c having red (R), green (G), and blue (B) colors. It is used in a three-plate projection type liquid crystal display device, which is a device, and is composed of three color unevenness correction units 13a to 13c provided corresponding to the three liquid crystal panels 5a to 5c, respectively. The liquid crystal panels 5a to 5c are driven by the liquid crystal panel drive circuit 4a.
 色むら補正部13aは、赤色の液晶パネル5aに対応して設けられたものであって、入力された赤色映像信号1aをV-T補正するVT補正回路2aと、入力された赤色映像信号1aについての輝度むらを補正するための第2の補正データとなる輝度むら補正データを発生させる第2の補正信号発生手段である色むら補正信号発生回路6aと、入力された赤色映像信号1aについての色むらを緑色を用いて補正するための第1のデータとなる色むら補正データを、緑色の液晶パネル5bに対応して設けられた色むら補正部13bに要求し、また、色むら補正部13bから、色むら補正部13bに入力された緑色映像信号1bについての色むらを赤色を用いて補正するための第1のデータとなる色むら補正データが要求された場合にその色むら補正データを出力する第1の補正信号発生手段である色むら補正信号発生回路7aと、入力された赤色映像信号1aについての色むらを青色を用いて補正するための第1のデータとなる色むら補正データを、青色の液晶パネル5cに対応して設けられた色むら補正部13cに要求し、また、色むら補正部13cから、色むら補正部13cに入力された青色映像信号1cについての色むらを赤色を用いて補正するための第1のデータとなる色むら補正データが要求された場合にその色むら補正データを出力する第1の補正信号発生手段である色むら補正信号発生回路8aと、色むら補正信号発生回路6aにて発生する輝度むら補正データや色むら補正信号発生回路7a,8aにて発生する色むら補正データを、入力されるH同期信号11a及びV同期信号12aに応じたタイミングで読み出すためのタイミング発生回路9aと、VT補正回路2aにてV-T補正された映像信号に、色むら補正信号発生回路6aにて発生した輝度むら補正データと色むら補正信号発生回路7a,8aにて発生した色むら補正データを加算する色むら補正信号加算回路3aとから構成されている。 The color unevenness correction unit 13a is provided corresponding to the red liquid crystal panel 5a, and includes a VT correction circuit 2a that performs VT correction on the input red video signal 1a, and the input red video signal 1a. Color unevenness correction signal generating circuit 6a which is a second correction signal generating means for generating luminance unevenness correction data to be second correction data for correcting the brightness unevenness with respect to, and the input red video signal 1a. Color unevenness correction data serving as first data for correcting color unevenness using green is requested to the color unevenness correcting unit 13b provided corresponding to the green liquid crystal panel 5b, and the color unevenness correcting unit. When the color unevenness correction data serving as the first data for correcting the color unevenness of the green video signal 1b input to the color unevenness correcting unit 13b from red is used from 13b, the color unevenness is requested. Color unevenness correction signal generating circuit 7a, which is a first correction signal generating means for outputting correction data, and a color that becomes first data for correcting the color unevenness of the input red video signal 1a using blue. The uneven color correction data is requested to the color unevenness correction unit 13c provided corresponding to the blue liquid crystal panel 5c, and the blue image signal 1c input to the color unevenness correction unit 13c from the color unevenness correction unit 13c is requested. A color unevenness correction signal generating circuit which is a first correction signal generating means for outputting color unevenness correction data when color unevenness correction data serving as first data for correcting color unevenness using red is requested. 8a and luminance unevenness correction data generated by the color unevenness correction signal generation circuit 6a and color unevenness correction data generated by the color unevenness correction signal generation circuits 7a and 8a are input to the H synchronization signal 11a and A timing generation circuit 9a for reading out at a timing according to the V synchronization signal 12a, luminance unevenness correction data generated by the color unevenness correction signal generation circuit 6a, and a video signal corrected by VT by the VT correction circuit 2a; The color unevenness correction signal adding circuit 3a adds color unevenness correction data generated by the color unevenness correction signal generating circuits 7a and 8a.
 色むら補正部13bは、緑色の液晶パネル5bに対応して設けられたものであって、入力された緑色映像信号1bをV-T補正するVT補正回路2bと、入力された緑色映像信号1bについての輝度むらを補正するための第2の補正データとなる輝度むら補正データを発生させる第2の補正信号発生手段である色むら補正信号発生回路6bと、入力された緑色映像信号1bについての色むらを青色を用いて補正するための第1のデータとなる色むら補正データを、青色の液晶パネル5cに対応して設けられた色むら補正部13cに要求し、また、色むら補正部13cから、色むら補正部13cに入力された青色映像信号1cについての色むらを緑色を用いて補正するための第1のデータとなる色むら補正データが要求された場合にその色むら補正データを出力する第1の補正信号発生手段である色むら補正信号発生回路7bと、入力された緑色映像信号1bについての色むらを赤色を用いて補正するための第1のデータとなる色むら補正データを色むら補正部13aに要求し、また、色むら補正部13aから、色むら補正部13aに入力された赤色映像信号1aについての色むらを緑色を用いて補正するための第1のデータとなる色むら補正データが要求された場合にその色むら補正データを出力する第1の補正信号発生手段である色むら補正信号発生回路8bと、色むら補正信号発生回路6bにて発生する輝度むら補正データや色むら補正信号発生回路7b,8bにて発生する色むら補正データを、入力されるH同期信号11b及びV同期信号12bに応じたタイミングで読み出すためのタイミング発生回路9bと、VT補正回路2bにてV-T補正された映像信号に、色むら補正信号発生回路6bにて発生した輝度むら補正データと色むら補正信号発生回路7b,8bにて発生した色むら補正データを加算する色むら補正信号加算回路3bとから構成されている。 The color unevenness correction unit 13b is provided corresponding to the green liquid crystal panel 5b, and includes a VT correction circuit 2b that performs VT correction on the input green video signal 1b, and an input green video signal 1b. Color unevenness correction signal generating circuit 6b, which is a second correction signal generating means for generating luminance unevenness correction data to be second correction data for correcting luminance unevenness, and an input green video signal 1b. Color unevenness correction data serving as first data for correcting color unevenness using blue is requested to the color unevenness correcting unit 13c provided corresponding to the blue liquid crystal panel 5c, and the color unevenness correcting unit. When the color unevenness correction data serving as the first data for correcting the color unevenness of the blue video signal 1c input to the color unevenness correcting unit 13c from green is used from 13c, the color unevenness is requested. Color unevenness correction signal generating circuit 7b, which is a first correction signal generating means for outputting correction data, and a color that becomes the first data for correcting the color unevenness of the input green video signal 1b using red. First, the color unevenness correction data is requested to the color unevenness correction unit 13a, and the color unevenness of the red video signal 1a input from the color unevenness correction unit 13a to the color unevenness correction unit 13a is corrected using green. Is generated by the color unevenness correction signal generation circuit 8b and the color unevenness correction signal generation circuit 6b, which are the first correction signal generation means for outputting the color unevenness correction data when the color unevenness correction data to be the color data is requested. Brightness unevenness correction data and color unevenness correction signal generated by the color unevenness correction signal generation circuits 7b and 8b are read at a timing according to the input H synchronization signal 11b and V synchronization signal 12b. Luminance generation correction data generated by the color unevenness correction signal generation circuit 6b and the color unevenness correction signal generation circuits 7b and 8b are added to the video signal VT corrected by the timing generation circuit 9b and the VT correction circuit 2b. And the color unevenness correction signal adding circuit 3b for adding the color unevenness correction data generated in (1).
 色むら補正部13cは、青色の液晶パネル5cに対応して設けられたものであって、入力された青色映像信号1cをV-T補正するVT補正回路2cと、入力された青色映像信号1cについての輝度むらを補正するための第2の補正データとなる輝度むら補正データを発生させる第2の補正信号発生手段である色むら補正信号発生回路6cと、入力された青色映像信号1cについての色むらを赤色を用いて補正するための第1のデータとなる色むら補正データを色むら補正部13aに要求し、また、色むら補正部13aから、色むら補正部13aに入力された赤色映像信号1aについての色むらを青色を用いて補正するための第1のデータとなる色むら補正データが要求された場合にその色むら補正データを出力する第1の補正信号発生手段である色むら補正信号発生回路7cと、入力された青色映像信号1cについての色むらを緑色を用いて補正するための第1のデータとなる色むら補正データを色むら補正部13bに要求し、また、色むら補正部13bから、色むら補正部13bに入力された緑色映像信号1bについての色むらを青色を用いて補正するための第1のデータとなる色むら補正データが要求された場合にその色むら補正データを出力する第1の補正信号発生手段である色むら補正信号発生回路8cと、色むら補正信号発生回路6cにて発生する輝度むら補正データや色むら補正信号発生回路7c,8cにて発生する色むら補正データを、入力されるH同期信号11c及びV同期信号12cに応じたタイミングで読み出すためのタイミング発生回路9cと、VT補正回路2cにてV-T補正された映像信号に、色むら補正信号発生回路6cにて発生した輝度むら補正データと色むら補正信号発生回路7c,8cにて発生した色むら補正データを加算する色むら補正信号加算回路3cとから構成されている。 The uneven color correction unit 13c is provided corresponding to the blue liquid crystal panel 5c, and includes a VT correction circuit 2c that performs VT correction on the input blue video signal 1c, and the input blue video signal 1c. Color unevenness correction signal generating circuit 6c, which is a second correction signal generating means for generating luminance unevenness correction data to be second correction data for correcting brightness unevenness, and an input blue video signal 1c. The color unevenness correction data that is the first data for correcting the color unevenness using red is requested to the color unevenness correction unit 13a, and the red color input from the color unevenness correction unit 13a to the color unevenness correction unit 13a. When color unevenness correction data that is the first data for correcting the color unevenness of the video signal 1a using blue is requested, the first correction signal generator that outputs the color unevenness correction data is requested. The color unevenness correction signal generation circuit 7c and the color unevenness correction unit 13b are requested to obtain color unevenness correction data as first data for correcting the color unevenness of the input blue video signal 1c using green. In addition, the color unevenness correction unit 13b requested color unevenness correction data serving as first data for correcting the color unevenness of the green video signal 1b input to the color unevenness correction unit 13b using blue. In this case, the color unevenness correction signal generation circuit 8c, which is the first correction signal generation means for outputting the color unevenness correction data, and the luminance unevenness correction data and the color unevenness correction signal generation circuit generated by the color unevenness correction signal generation circuit 6c. A timing generation circuit 9c for reading the color unevenness correction data generated in 7c and 8c at a timing according to the input H synchronization signal 11c and V synchronization signal 12c, and a VT compensation The luminance unevenness correction data generated by the color unevenness correction signal generation circuit 6c and the color unevenness correction data generated by the color unevenness correction signal generation circuits 7c and 8c are added to the video signal that has been VT corrected by the circuit 2c. The color unevenness correction signal adding circuit 3c is constituted.
 以下に、上記のように構成された色むら補正装置の動作について説明する。 Hereinafter, the operation of the color unevenness correction apparatus configured as described above will be described.
 色むら補正部13a~13cに赤色映像信号1a、緑色映像信号1b及び青色映像信号1cがそれぞれ入力されると、VT補正回路2a~2cにおいて、入力された赤色映像信号1a、緑色映像信号1b及び青色映像信号1cについて液晶の電圧-透過率特性をリニアな特性に変換することでV-T補正を行う。このV-T補正された信号は、色むら補正信号加算回路3a~3cと色むら補正信号発生回路6a~6cにそれぞれ入力される。 When the red video signal 1a, the green video signal 1b, and the blue video signal 1c are input to the color unevenness correction units 13a to 13c, respectively, the input red video signal 1a, green video signal 1b, and VT correction is performed by converting the voltage-transmittance characteristics of the liquid crystal into linear characteristics for the blue video signal 1c. The VT corrected signal is input to the color unevenness correction signal adding circuits 3a to 3c and the color unevenness correction signal generating circuits 6a to 6c, respectively.
 色むら補正信号発生回路6a~6cにおいては、投写した映像信号の輝度レベルから求めた輝度むら補正データが内部のメモリ(不図示)に記憶されており、タイミング発生回路9a~9cにおいて、映像信号のH同期信号7a~7c及びV同期信号8a~8cに応じたタイミングでこの補正データを読み出す。この色むら補正信号発生回路6a~6cのメモリに記憶された輝度むら補正データは、赤色、緑色、青色の液晶パネル5a~5c毎に面内の輝度データが測定され、その輝度データに基づいて設定されている。 In the nonuniform color correction signal generation circuits 6a to 6c, luminance nonuniformity correction data obtained from the luminance level of the projected video signal is stored in an internal memory (not shown). In the timing generation circuits 9a to 9c, the video signal The correction data is read at a timing according to the H synchronization signals 7a to 7c and the V synchronization signals 8a to 8c. The brightness unevenness correction data stored in the memories of the color unevenness correction signal generation circuits 6a to 6c are measured in the plane for each of the red, green, and blue liquid crystal panels 5a to 5c, and based on the brightness data. Is set.
 また、色むら補正部13a~13cにそれぞれ入力された赤色映像信号1a、緑色映像信号1b及び青色映像信号1cは、色むら補正部13aにおいては色むら補正信号発生回路7a,8aに入力され、色むら補正部13bにおいては色むら補正信号発生回路7b,8bに入力され、色むら補正部13cにおいては色むら補正信号発生回路7c,8cに入力される。 The red video signal 1a, the green video signal 1b, and the blue video signal 1c respectively input to the color unevenness correction units 13a to 13c are input to the color unevenness correction signal generation circuits 7a and 8a in the color unevenness correction unit 13a. The color unevenness correction unit 13b inputs the color unevenness correction signal generation circuits 7b and 8b, and the color unevenness correction unit 13c inputs the color unevenness correction signal generation circuits 7c and 8c.
 図3は、図2に示した色むら補正信号発生回路7aの構成を示す図である。なお、図2に示した色むら補正信号発生回路7b,7c,8a~8cの構成もこれと同様である。 FIG. 3 is a diagram showing a configuration of the color unevenness correction signal generation circuit 7a shown in FIG. The configuration of the color unevenness correction signal generation circuits 7b, 7c, 8a to 8c shown in FIG. 2 is the same as this.
 図2に示した色むら補正信号発生回路7a~7c,8a~8cは、図3に示すように、記憶手段であるルックアップテーブル14と、補正信号要求手段である補正データ要求部15と、補正データ生成部18とから構成されている。 As shown in FIG. 3, the uneven color correction signal generation circuits 7a to 7c and 8a to 8c shown in FIG. 2 include a look-up table 14 as storage means, a correction data request unit 15 as correction signal request means, The correction data generation unit 18 is configured.
 ルックアップテーブル14には、色むら補正信号発生回路7a~7c,8a~8c毎に、液晶パネル5a~5cを用いて表示される画像における色むらを補正するための補正データが記憶されている。これは、液晶パネル5a~5cを用いて表示される画像をカラーカメラ等を用いて予め撮影し、色むらがなくなるような補正データを設定しておく。具体的には、まず、液晶パネル5a~5cから投写表示された映像表示画面を複数のブロックに分割し、そのブロック毎に色むらを測定する。上述したように、3枚の液晶パネル5a~5cを用いてカラー画像を投写表示する場合、赤色、緑色、青色のそれぞれについて、例えば、光源であるランプにおいて面内の色度分布が厳密には一様でない場合に、全体が均一な色に見えないという色むらが発生する。そこで、分割した複数のブロック毎に、例えば、液晶パネル5aを用いて赤色が単色表示される場合に、他の緑色や青色によって全体を均一な色となるように、他の色を用いて色むらを補正するための補正量を生成する。これは、入力された映像信号の明るさにも対応しており、例えば、色むら補正部13aの色むら補正信号発生回路7aにおいては、上述した複数のブロックのそれぞれについて、入力される赤色映像信号1aの明るさに応じて、緑色を用いて色むらを補正するのに十分な振幅が設定され、また、色むら補正信号発生回路8aにおいては、上述した複数のブロックのそれぞれについて、入力される赤色映像信号1aの明るさに応じて、青色を用いて色むらを補正するのに十分な振幅が設定されている。また、色むら補正部13bの色むら補正信号発生回路7bにおいては、上述した複数のブロックのそれぞれについて、入力される緑色映像信号1bの明るさに応じて、青色を用いて色むらを補正するのに十分な振幅が設定され、また、色むら補正信号発生回路8bにおいては、上述した複数のブロックのそれぞれについて、入力される緑色映像信号1bの明るさに応じて、赤色を用いて色むらを補正するのに十分な振幅が設定されている。また、色むら補正部13cの色むら補正信号発生回路7cにおいては、上述した複数のブロックのそれぞれについて、入力される青色映像信号1cの明るさに応じて、赤色を用いて色むらを補正するのに十分な振幅が設定され、また、色むら補正信号発生回路8cにおいては、上述した複数のブロックのそれぞれについて、入力される青色映像信号1cの明るさに応じて、緑色を用いて色むらを補正するのに十分な振幅が設定されている。なお、上述したように分割されるブロックについては、その数が多くなればなるほど、精細な制御が可能となるが、ルックアップテーブル14に記憶される情報量が膨大なものとなってしまう。そのため、ブロックのデータをある程度離散的に保持し、ブロック間のデータについて補間を行うことにより、ルックアップテーブル14に記憶される情報量を膨大なものとせずに精細な制御を可能とすることができる。 The lookup table 14 stores correction data for correcting color unevenness in images displayed using the liquid crystal panels 5a to 5c for each of the color unevenness correction signal generation circuits 7a to 7c and 8a to 8c. . For this, images displayed using the liquid crystal panels 5a to 5c are taken in advance using a color camera or the like, and correction data is set so as to eliminate color unevenness. Specifically, first, the video display screen projected and displayed from the liquid crystal panels 5a to 5c is divided into a plurality of blocks, and the color unevenness is measured for each block. As described above, when a color image is projected and displayed using the three liquid crystal panels 5a to 5c, the in-plane chromaticity distribution of each of red, green, and blue is strictly, for example, in a lamp that is a light source. In the case of non-uniformity, color unevenness occurs that the whole color does not appear to be uniform. Therefore, for example, when red is displayed in a single color using the liquid crystal panel 5a for each of the plurality of divided blocks, the color is changed using other colors so that the entire color becomes uniform with other green and blue. A correction amount for correcting the unevenness is generated. This also corresponds to the brightness of the input video signal. For example, in the color unevenness correction signal generation circuit 7a of the color unevenness correction unit 13a, the red video input for each of the plurality of blocks described above. An amplitude sufficient to correct color unevenness using green is set according to the brightness of the signal 1a, and the color unevenness correction signal generation circuit 8a is input to each of the plurality of blocks described above. In accordance with the brightness of the red video signal 1a, an amplitude sufficient to correct color unevenness using blue is set. Further, the color unevenness correction signal generation circuit 7b of the color unevenness correction unit 13b corrects the color unevenness using blue for each of the plurality of blocks described above according to the brightness of the input green video signal 1b. In the color unevenness correction signal generation circuit 8b, the color unevenness using red is determined for each of the plurality of blocks according to the brightness of the input green video signal 1b. A sufficient amplitude is set to correct Further, the color unevenness correction signal generation circuit 7c of the color unevenness correction unit 13c corrects color unevenness using red for each of the plurality of blocks described above according to the brightness of the input blue video signal 1c. In the color unevenness correction signal generation circuit 8c, for each of the plurality of blocks described above, the color unevenness using green according to the brightness of the input blue video signal 1c. A sufficient amplitude is set to correct As the number of blocks divided as described above increases, finer control becomes possible, but the amount of information stored in the lookup table 14 becomes enormous. For this reason, the block data is held to some extent discretely, and interpolation is performed on the data between the blocks, thereby enabling fine control without making the amount of information stored in the lookup table 14 enormous. it can.
 赤色映像信号1aが色むら補正信号発生回路7a,8aにそれぞれ入力されると、色むら補正信号発生回路7a,8aにおいて、ルックアップテーブル14を参照し、入力された赤色映像信号1aの明るさに応じて、赤色映像信号1aの色むらを補正するための補正データを要求する。上述したように、色むら補正信号発生回路7aのルックアップテーブル14には、入力される赤色映像信号1aの明るさに応じて、緑色を用いて色むらを補正するのに十分な振幅が補正量として複数のブロック毎に設定されているので、色むら補正信号発生回路7aの補正データ要求部15は、複数のブロック毎に、入力された赤色映像信号1aの明るさに応じて、赤色映像信号1aの色むらを補正するための振幅を有する緑色による色むら補正データを出力する旨を色むら補正部13bに要求する。同様に、色むら補正信号発生回路8aのルックアップテーブル14には、入力される赤色映像信号1aの明るさに応じて、青色を用いて色むらを補正するのに十分な振幅が補正量として複数のブロック毎に設定されているので、色むら補正信号発生回路8aの補正データ要求部15は、複数のブロック毎に、入力された赤色映像信号1aの明るさに応じて、赤色映像信号1aの色むらを補正するための振幅を有する青色による色むら補正データを出力する旨を色むら補正部13cに要求する。 When the red video signal 1a is input to the color unevenness correction signal generation circuits 7a and 8a, respectively, the color unevenness correction signal generation circuits 7a and 8a refer to the look-up table 14 and the brightness of the input red video signal 1a. Accordingly, correction data for correcting the color unevenness of the red video signal 1a is requested. As described above, the look-up table 14 of the color unevenness correction signal generation circuit 7a has an amplitude sufficient to correct color unevenness using green according to the brightness of the input red video signal 1a. Since the amount is set for each of the plurality of blocks, the correction data requesting unit 15 of the color unevenness correction signal generating circuit 7a determines the red video for each of the plurality of blocks according to the brightness of the input red video signal 1a. The color unevenness correction unit 13b is requested to output green color unevenness correction data having an amplitude for correcting the color unevenness of the signal 1a. Similarly, the look-up table 14 of the color unevenness correction signal generation circuit 8a has an amplitude sufficient to correct color unevenness using blue according to the brightness of the input red video signal 1a. Since it is set for each of the plurality of blocks, the correction data requesting unit 15 of the color unevenness correction signal generating circuit 8a determines the red video signal 1a for each of the plurality of blocks according to the brightness of the input red video signal 1a. The color unevenness correction unit 13c is requested to output blue color unevenness correction data having an amplitude for correcting the color unevenness.
 また、上述したように、色むら補正信号発生回路7bのルックアップテーブル14には、入力される緑色映像信号1bの明るさに応じて、青色を用いて色むらを補正するのに十分な振幅が補正量として複数のブロック毎に設定されているので、色むら補正信号発生回路7bの補正データ要求部15は、複数のブロック毎に、入力された緑色映像信号1bの明るさに応じて、緑色映像信号1bの色むらを補正するための振幅を有する青色による色むら補正データを出力する旨を色むら補正部13cに要求する。同様に、色むら補正信号発生回路8bのルックアップテーブル14には、入力される緑色映像信号1bの明るさに応じて、赤色を用いて色むらを補正するのに十分な振幅が補正量として複数のブロック毎に設定されているので、色むら補正信号発生回路8bの補正データ要求部15は、複数のブロック毎に、入力された緑色映像信号1bの明るさに応じて、緑色映像信号1bの色むらを補正するための振幅を有する赤色による色むら補正データを出力する旨を色むら補正部13aに要求する。 Further, as described above, the look-up table 14 of the color unevenness correction signal generation circuit 7b has an amplitude sufficient to correct the color unevenness using blue according to the brightness of the input green video signal 1b. Is set for each of the plurality of blocks as the correction amount, the correction data requesting unit 15 of the color unevenness correction signal generating circuit 7b is set according to the brightness of the input green video signal 1b for each of the plurality of blocks. The color unevenness correction unit 13c is requested to output the color unevenness correction data in blue having an amplitude for correcting the color unevenness of the green video signal 1b. Similarly, in the lookup table 14 of the color unevenness correction signal generation circuit 8b, an amplitude sufficient to correct color unevenness using red is used as a correction amount according to the brightness of the input green video signal 1b. Since it is set for each of the plurality of blocks, the correction data requesting unit 15 of the color unevenness correction signal generating circuit 8b determines the green video signal 1b for each of the plurality of blocks according to the brightness of the input green video signal 1b. The color unevenness correction unit 13a is requested to output red color unevenness correction data having an amplitude for correcting the color unevenness.
 また、上述したように、色むら補正信号発生回路7cのルックアップテーブル14には、入力される青色映像信号1cの明るさに応じて、赤色を用いて色むらを補正するのに十分な振幅が補正量として複数のブロック毎に設定されているので、色むら補正信号発生回路7cの補正データ要求部15は、複数のブロック毎に、入力された青色映像信号1cの明るさに応じて、青色映像信号1cの色むらを補正するための振幅を有する赤色による色むら補正データを出力する旨を色むら補正部13aに要求する。同様に、色むら補正信号発生回路8cのルックアップテーブル14には、入力される青色映像信号1cの明るさに応じて、緑色を用いて色むらを補正するのに十分な振幅が補正量として複数のブロック毎に設定されているので、色むら補正信号発生回路8cの補正データ要求部15は、複数のブロック毎に、入力された青色映像信号1cの明るさに応じて、青色映像信号1cの色むらを補正するための振幅を有する緑色による色むら補正データを出力する旨を色むら補正部13aに要求する。 Further, as described above, the look-up table 14 of the color unevenness correction signal generation circuit 7c has an amplitude sufficient to correct color unevenness using red according to the brightness of the input blue video signal 1c. Is set for each of the plurality of blocks as the correction amount, the correction data requesting unit 15 of the color unevenness correction signal generating circuit 7c is set for each of the plurality of blocks according to the brightness of the input blue video signal 1c. The color unevenness correction unit 13a is requested to output red color unevenness correction data having an amplitude for correcting the color unevenness of the blue video signal 1c. Similarly, in the lookup table 14 of the color unevenness correction signal generation circuit 8c, an amplitude sufficient to correct color unevenness using green is used as a correction amount according to the brightness of the input blue video signal 1c. Since it is set for each of the plurality of blocks, the correction data requesting unit 15 of the color unevenness correction signal generating circuit 8c determines the blue video signal 1c for each of the plurality of blocks according to the brightness of the input blue video signal 1c. The color unevenness correction unit 13a is requested to output green color unevenness correction data having an amplitude for correcting the color unevenness.
 このようにして色むら補正信号発生回路7a~7c,8a~8cにおいて、異なる色むら補正部13a~13cに対して色むら補正データを出力する旨が要求されると、この要求を受けた色むら補正部13a~13cにおいては、色むら補正信号発生回路7a~7c,8a~8cの補正データ生成部18において、色むら補正信号発生回路7a~7c,8a~8cからの要求に応じた色むら補正データを生成する。 In this way, when the color unevenness correction signal generation circuits 7a to 7c and 8a to 8c are requested to output the color unevenness correction data to the different color unevenness correction units 13a to 13c, the color that has received this request. In the unevenness correction units 13a to 13c, in the correction data generation unit 18 of the color unevenness correction signal generation circuits 7a to 7c and 8a to 8c, the color according to the request from the color unevenness correction signal generation circuits 7a to 7c and 8a to 8c. Unevenness correction data is generated.
 例えば、色むら補正信号発生回路7aの補正データ生成部18においては、色むら補正部13bの色むら補正信号発生回路8bから、上述した複数のブロック毎にその振幅が指定された赤色による補正データを出力する旨が要求されているため、その要求に応じて複数のブロック毎に、色むら補正信号発生回路8bから要求された振幅を有する赤色による色むら補正データを生成する。同様に、色むら補正信号発生回路8aの補正データ生成部18においては、色むら補正部13cの色むら補正信号発生回路7cから、上述した複数のブロック毎にその振幅が指定された赤色による補正データを出力する旨が要求されているため、その要求に応じて複数のブロック毎に、色むら補正信号発生回路7cから要求された振幅を有する赤色による色むら補正データを生成する。 For example, in the correction data generation unit 18 of the color unevenness correction signal generation circuit 7a, the correction data in red whose amplitude is designated for each of the plurality of blocks described above from the color unevenness correction signal generation circuit 8b of the color unevenness correction unit 13b. Is output for each of a plurality of blocks in response to the request, the color unevenness correction data in red having the amplitude requested from the color unevenness correction signal generation circuit 8b is generated. Similarly, in the correction data generation unit 18 of the color unevenness correction signal generation circuit 8a, correction is performed in red from the color unevenness correction signal generation circuit 7c of the color unevenness correction unit 13c with the amplitude specified for each of the plurality of blocks described above. Since it is requested to output data, in response to the request, the color unevenness correction data in red having the amplitude requested from the color unevenness correction signal generation circuit 7c is generated for each of the plurality of blocks.
 また、色むら補正信号発生回路7bの補正データ生成部18においては、色むら補正部13cの色むら補正信号発生回路8cから、上述した複数のブロック毎にその振幅が指定された緑色による補正データを出力する旨が要求されているため、その要求に応じて複数のブロック毎に、色むら補正信号発生回路8cから要求された振幅を有する緑色による色むら補正データを生成する。同様に、色むら補正信号発生回路8bの補正データ生成部18においては、色むら補正部13aの色むら補正信号発生回路7aから、上述した複数のブロック毎にその振幅が指定された緑色による補正データを出力する旨が要求されているため、その要求に応じて複数のブロック毎に、色むら補正信号発生回路7aから要求された振幅を有する緑色による色むら補正データを生成する。 Further, in the correction data generation unit 18 of the color unevenness correction signal generation circuit 7b, the correction data in green in which the amplitude is specified for each of the plurality of blocks described above from the color unevenness correction signal generation circuit 8c of the color unevenness correction unit 13c. Is output for each of a plurality of blocks in response to the request, the color unevenness correction data in green having the amplitude requested from the color unevenness correction signal generation circuit 8c is generated. Similarly, in the correction data generation unit 18 of the color unevenness correction signal generation circuit 8b, the correction is performed in green in which the amplitude is designated for each of the plurality of blocks from the color unevenness correction signal generation circuit 7a of the color unevenness correction unit 13a. Since it is requested to output data, in response to the request, color unevenness correction data in green having the amplitude requested from the color unevenness correction signal generation circuit 7a is generated for each of a plurality of blocks.
 また、色むら補正信号発生回路7cの補正データ生成部18においては、色むら補正部13aの色むら補正信号発生回路8aから、上述した複数のブロック毎にその振幅が指定された青色による補正データを出力する旨が要求されているため、その要求に応じて複数のブロック毎に、色むら補正信号発生回路8aから要求された振幅を有する青色による色むら補正データを生成する。同様に、色むら補正信号発生回路8cの補正データ生成部18においては、色むら補正部13bの色むら補正信号発生回路7bから、上述した複数のブロック毎にその振幅が指定された青色による補正データを出力する旨が要求されているため、その要求に応じて複数のブロック毎に、色むら補正信号発生回路7bから要求された振幅を有する青色による色むら補正データを生成する。 Further, in the correction data generation unit 18 of the color unevenness correction signal generation circuit 7c, the correction data in blue in which the amplitude is designated for each of the plurality of blocks from the color unevenness correction signal generation circuit 8a of the color unevenness correction unit 13a. Is output for each of a plurality of blocks in response to the request, and color unevenness correction data for blue having the amplitude requested from the color unevenness correction signal generation circuit 8a is generated. Similarly, in the correction data generation unit 18 of the color unevenness correction signal generation circuit 8c, the color unevenness correction signal generation circuit 7b of the color unevenness correction unit 13b corrects with blue whose amplitude is designated for each of the plurality of blocks described above. Since it is requested to output data, in response to the request, color unevenness correction data in blue having the amplitude requested from the color unevenness correction signal generation circuit 7b is generated for each of a plurality of blocks.
 このように生成された色むら補正データは、色むら補正信号発生回路6a~6cのメモリに記憶された輝度むら補正データと同様に、タイミング発生回路9a~9cにおいて、映像信号のH同期信号7a~7c及びV同期信号8a~8cに応じたタイミングで読み出される。 The color unevenness correction data generated in this way is the H synchronization signal 7a of the video signal in the timing generation circuits 9a to 9c, similarly to the luminance unevenness correction data stored in the memories of the color unevenness correction signal generation circuits 6a to 6c. To 7c and V synchronization signals 8a to 8c are read at timings.
 そして、色むら補正信号加算回路3a~3cにおいて、VT補正回路2a~2cにてV-T補正された映像信号に、色むら補正信号発生回路6a~6cから読み出された輝度むら補正データと、色むら補正信号発生回路7a~7c,8a~8cから読み出された色むら補正データとを加算する。 Then, in the color unevenness correction signal adding circuits 3a to 3c, the luminance unevenness correction data read from the color unevenness correction signal generating circuits 6a to 6c are converted into the video signals that have been subjected to VT correction in the VT correction circuits 2a to 2c. The uneven color correction data read from the uneven color correction signal generation circuits 7a to 7c and 8a to 8c are added.
 その後、色むら補正信号加算回路3a~3cにて、色むら補正信号発生回路6a~6cから読み出された輝度むら補正データと、色むら補正信号発生回路7a~7c,8a~8cから読み出された色むら補正データとが加算された映像信号に基づいて液晶パネル駆動回路4a~4cが液晶パネル5a~5cを駆動し、赤色、緑色、青色の液晶パネル5a~5cを介して投写される画像が合成されてカラー画像が表示されることになる。 Thereafter, the luminance unevenness correction signal addition circuits 3a to 3c read the luminance unevenness correction data read from the color unevenness correction signal generation circuits 6a to 6c and the color unevenness correction signal generation circuits 7a to 7c and 8a to 8c. The liquid crystal panel drive circuits 4a to 4c drive the liquid crystal panels 5a to 5c based on the video signal added with the color unevenness correction data, and are projected through the red, green, and blue liquid crystal panels 5a to 5c. The images are combined and a color image is displayed.
 この際、色むら補正信号加算回路3a~3cから出力される映像信号には、色むら補正信号発生回路6a~6cから出力された輝度むら補正信号が加算されているため、赤色映像信号1a、緑色映像信号1b及び青色映像信号1cによる輝度むらが補正され、また、色むら補正信号発生回路7a~7c,8a~8cから出力された色むら補正信号が加算されているため、赤色映像信号1a、緑色映像信号1b及び青色映像信号1cの単色による色むらが補正される。 At this time, since the luminance unevenness correction signals output from the color unevenness correction signal generating circuits 6a to 6c are added to the video signals output from the color unevenness correction signal adding circuits 3a to 3c, the red video signal 1a, Since the luminance unevenness due to the green video signal 1b and the blue video signal 1c is corrected, and the color unevenness correction signals output from the color unevenness correction signal generation circuits 7a to 7c and 8a to 8c are added, the red video signal 1a The color unevenness due to the single color of the green video signal 1b and the blue video signal 1c is corrected.
 例えば、色むら補正部13aに入力される赤色映像信号1aについては、液晶パネル5b,5cを介して投写される緑色及び青色による画像の中に、赤色映像信号1aの単色による色むらを補正するための色むら補正データがそれぞれ含まれているため、これら緑色及び青色による色むら補正データと、液晶パネル5aを介して投写される赤色による画像とが合成されると、赤色映像信号1aの単色においてはその色むらが補正されて全体が均一な色となる。 For example, for the red video signal 1a input to the color unevenness correction unit 13a, the color unevenness due to the single color of the red video signal 1a is corrected in the green and blue images projected via the liquid crystal panels 5b and 5c. Therefore, when the color unevenness correction data of green and blue and the image of red projected through the liquid crystal panel 5a are combined, the single color of the red video signal 1a is included. The color unevenness is corrected and the entire color becomes uniform.
 また、色むら補正部13bに入力される緑色映像信号1bについては、液晶パネル5a,5cを介して投写される赤色及び青色による画像の中に、緑色映像信号1bの単色による色むらを補正するための色むら補正データがそれぞれ含まれているため、これら赤色及び青色による色むら補正データと、液晶パネル5bを介して投写される緑色による画像とが合成されると、緑色映像信号1bの単色においてはその色むらが補正されて全体が均一な色となる。 For the green video signal 1b input to the color unevenness correction unit 13b, the color unevenness due to the single color of the green video signal 1b is corrected in the red and blue images projected through the liquid crystal panels 5a and 5c. Therefore, when the color unevenness correction data of red and blue and the image of green projected through the liquid crystal panel 5b are combined, a single color of the green video signal 1b is included. The color unevenness is corrected and the entire color becomes uniform.
 また、色むら補正部13cに入力される青色映像信号1cについては、液晶パネル5a,5bを介して投写される赤色及び緑色による画像の中に、青色映像信号1cの単色による色むらを補正するための色むら補正データがそれぞれ含まれているため、これら赤色及び緑色による色むら補正データと、液晶パネル5cを介して投写される青色による画像とが合成されると、青色映像信号1cの単色においてはその色むらが補正されて全体が均一な色となる。 For the blue video signal 1c input to the color unevenness correction unit 13c, the color unevenness due to the single color of the blue video signal 1c is corrected in the red and green images projected via the liquid crystal panels 5a and 5b. Therefore, when the color unevenness correction data of red and green and the image of blue projected through the liquid crystal panel 5c are combined, a single color of the blue video signal 1c is included. The color unevenness is corrected and the entire color becomes uniform.
 なお、色むら補正信号発生回路7a~7c,8a~8cにおいては、VT補正回路2a~2cによるV-T補正前の信号レベルを用いている。これは、VT補正回路2a~2cにおけるV-T補正は、入力された赤色映像信号1a、緑色映像信号1b及び青色映像信号1cについて液晶の電圧-透過率特性をリニアな特性に変換するものであることにより、V-T補正後の信号には液晶パネル5a~5cの特性も含まれている一方、赤色映像信号1a、緑色映像信号1b及び青色映像信号1cの単色の色むらは光学系にて発生するものであるため、色むらの補正を液晶パネル5a~5cの特性に依存させないためである。 In the color unevenness correction signal generation circuits 7a to 7c and 8a to 8c, signal levels before VT correction by the VT correction circuits 2a to 2c are used. This is because the VT correction in the VT correction circuits 2a to 2c converts the voltage-transmittance characteristics of the liquid crystal into linear characteristics for the input red video signal 1a, green video signal 1b and blue video signal 1c. As a result, the VT-corrected signal includes the characteristics of the liquid crystal panels 5a to 5c, while the single color unevenness of the red video signal 1a, the green video signal 1b, and the blue video signal 1c is included in the optical system. This is because color unevenness correction does not depend on the characteristics of the liquid crystal panels 5a to 5c.
 (他の実施の形態)
 図4は、本発明の色むら補正装置の他の実施の形態が用いられた映像表示装置の構成を示すブロック図である。また、図5は、図4に示した色むら補正信号発生回路107aの構成を示す図である。なお、図4に示した色むら補正信号発生回路107b,107c,108a~108cの構成もこれと同様である。
(Other embodiments)
FIG. 4 is a block diagram showing a configuration of a video display apparatus in which another embodiment of the color unevenness correction apparatus of the present invention is used. FIG. 5 is a diagram showing a configuration of the color unevenness correction signal generation circuit 107a shown in FIG. The configuration of the color unevenness correction signal generation circuits 107b, 107c, 108a to 108c shown in FIG. 4 is the same as this.
 本形態は図4に示すように、図2に示したものに対して、色むら補正部113a~113cのそれぞれに2つずつの振幅制御回路116a~116c,117a~117cをさらに有する点が異なるものである。この振幅制御回路116a~116c,117a~117cは、例えば、乗算器によって構成することが考えられる。 As shown in FIG. 4, the present embodiment is different from that shown in FIG. 2 in that each of the color unevenness correction units 113a to 113c further includes two amplitude control circuits 116a to 116c and 117a to 117c. Is. The amplitude control circuits 116a to 116c and 117a to 117c can be configured by, for example, multipliers.
 本形態における色むら補正信号107a~107cは図5に示すように、記憶手段であるルックアップテーブル114と、補正信号要求手段である補正データ要求部115と、補正データ生成部118とから構成されている。 As shown in FIG. 5, the color unevenness correction signals 107a to 107c in the present embodiment are composed of a look-up table 114 as storage means, a correction data request section 115 as correction signal request means, and a correction data generation section 118. ing.
 図3に示したものと同様に、ルックアップテーブル114には、色むら補正信号発生回路107a~107c,108a~108c毎に、液晶パネル105a~105cを用いて表示される画像における色むらを補正するための補正データが記憶されているが、本形態におけるルックアップテーブル114に記憶された補正データは、入力された映像信号の明るさには対応していない。そのため、上述した複数のブロックのそれぞれについて1つずつの補正データが記憶されていることになる。 Similar to the one shown in FIG. 3, the look-up table 114 corrects color unevenness in an image displayed using the liquid crystal panels 105a to 105c for each of the color unevenness correction signal generation circuits 107a to 107c and 108a to 108c. However, the correction data stored in the look-up table 114 in this embodiment does not correspond to the brightness of the input video signal. Therefore, one correction data is stored for each of the plurality of blocks described above.
 補正データ要求部115において、このルックアップテーブル114を参照してブロック毎に補正データを要求すると、振幅制御回路116a~116c,117a~117cにおいて、要求される補正データについて、入力された映像信号に応じた振幅を指定する。 When the correction data requesting unit 115 requests correction data for each block with reference to the lookup table 114, the amplitude control circuits 116a to 116c and 117a to 117c send the requested correction data to the input video signal. Specify the corresponding amplitude.
 具体的には、振幅制御回路116aにおいては、色むら補正信号発生回路107aにて色むら補正部113bの色むら補正信号発生回路108bに対して要求された補正データについて、入力された赤色映像信号101aの明るさに応じて、赤色映像信号101aの単色による色むらが補正されるような振幅を指定する。同様に、振幅制御回路117aにおいては、色むら補正信号発生回路108aにて色むら補正部113cの色むら補正信号発生回路107cに対して要求された補正データについて、入力された赤色映像信号101aの明るさに応じて、赤色映像信号101aの単色による色むらが補正されるような振幅を指定する。 Specifically, in the amplitude control circuit 116a, the input red video signal for the correction data requested to the color unevenness correction signal generation circuit 108b of the color unevenness correction unit 113b by the color unevenness correction signal generation circuit 107a. In accordance with the brightness of 101a, an amplitude is specified so that the color unevenness due to a single color of the red video signal 101a is corrected. Similarly, in the amplitude control circuit 117a, the correction data requested to the color unevenness correction signal generation circuit 107c of the color unevenness correction unit 113c by the color unevenness correction signal generation circuit 108a is applied to the input red video signal 101a. In accordance with the brightness, an amplitude is specified such that the color unevenness due to the single color of the red video signal 101a is corrected.
 また、振幅制御回路116bにおいては、色むら補正信号発生回路107bにて色むら補正部113cの色むら補正信号発生回路108cに対して要求された補正データについて、入力された緑色映像信号101bの明るさに応じて、緑色映像信号101bの単色による色むらが補正されるような振幅を指定する。同様に、振幅制御回路117bにおいては、色むら補正信号発生回路108bにて色むら補正部113aの色むら補正信号発生回路107aに対して要求された補正データについて、入力された緑色映像信号101bの明るさに応じて、緑色映像信号101aの単色による色むらが補正されるような振幅を指定する。 Also, in the amplitude control circuit 116b, the brightness of the input green video signal 101b with respect to the correction data requested to the color unevenness correction signal generation circuit 108c of the color unevenness correction unit 113c by the color unevenness correction signal generation circuit 107b. Accordingly, the amplitude is specified so that the color unevenness due to the single color of the green video signal 101b is corrected. Similarly, in the amplitude control circuit 117b, the correction data requested to the color unevenness correction signal generation circuit 107a of the color unevenness correction unit 113a in the color unevenness correction signal generation circuit 108b is applied to the input green video signal 101b. In accordance with the brightness, an amplitude is specified such that the color unevenness due to a single color of the green video signal 101a is corrected.
 また、振幅制御回路116cにおいては、色むら補正信号発生回路107cにて色むら補正部113aの色むら補正信号発生回路108aに対して要求された補正データについて、入力された青色映像信号101cの明るさに応じて、青色映像信号101cの単色による色むらが補正されるような振幅を指定する。同様に、振幅制御回路117cにおいては、色むら補正信号発生回路108cにて色むら補正部113bの色むら補正信号発生回路107bに対して要求された補正データについて、入力された青色映像信号101cの明るさに応じて、青色映像信号101cの単色による色むらが補正されるような振幅を指定する。 Further, in the amplitude control circuit 116c, the brightness of the input blue video signal 101c with respect to the correction data requested to the color unevenness correction signal generation circuit 108a of the color unevenness correction unit 113a by the color unevenness correction signal generation circuit 107c. Accordingly, the amplitude is specified so that the color unevenness due to the single color of the blue video signal 101c is corrected. Similarly, in the amplitude control circuit 117c, the correction data requested to the color unevenness correction signal generation circuit 107b of the color unevenness correction unit 113b by the color unevenness correction signal generation circuit 108c is applied to the input blue video signal 101c. In accordance with the brightness, an amplitude is specified such that the color unevenness due to the single color of the blue video signal 101c is corrected.
 このようにして振幅制御回路116a~116c,117a~117cにて振幅が指定された補正データが要求され、その後、図2に示したものと同様の処理が行われることになる。 In this way, correction data whose amplitude is designated by the amplitude control circuits 116a to 116c and 117a to 117c is requested, and thereafter, the same processing as shown in FIG. 2 is performed.
 上述したように本形態においては、ルックアップテーブル114には、色むら補正信号発生回路107a~107c,108a~108c毎に、液晶パネル105a~105cを用いて表示される画像における色むらを補正するための補正データが、上述した複数のブロックのそれぞれについて1つずつしか記憶されていないため、ルックアップテーブル114にて記憶されるデータ量を削減することができる。 As described above, in this embodiment, the look-up table 114 corrects color unevenness in an image displayed using the liquid crystal panels 105a to 105c for each of the color unevenness correction signal generation circuits 107a to 107c and 108a to 108c. Since only one correction data is stored for each of the plurality of blocks described above, the amount of data stored in the lookup table 114 can be reduced.
 以上、実施例を参照して本願発明を説明したが、本願発明は上記実施例に限定されるものではない。本願発明の構成や詳細には、本願発明のスコープ内で当業者が理解し得る様々な変更をすることができる。 Although the present invention has been described with reference to the embodiments, the present invention is not limited to the above embodiments. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention.

Claims (7)

  1.  互いに異なる色を具備する複数の液晶パネルを用いてカラー画像を投写表示する映像表示装置に用いられ、前記複数の液晶パネルを用いて投写表示される画像における色むらを補正するために各液晶パネルのそれぞれに対応して設けられた複数の色むら補正手段からなる色むら補正装置であって、
     前記複数の色むら補正手段のそれぞれは、
     他の色むら補正手段に対応する液晶パネルの色を用いて前記色むらを補正するための第1の補正データを前記他の色むら補正手段に要求し、他の色むら補正手段から前記第1の補正データが要求された場合に該第1の補正データを出力する第1の補正信号発生手段と、
     入力された映像信号に、前記第1の補正信号発生手段から出力された第1の補正データを加算する加算手段とを有する色むら補正装置。
    Each liquid crystal panel is used in a video display device that projects and displays a color image using a plurality of liquid crystal panels having different colors, and corrects color unevenness in an image projected and displayed using the plurality of liquid crystal panels. A color unevenness correction device comprising a plurality of color unevenness correction means provided corresponding to each of the above,
    Each of the plurality of uneven color correction means includes
    The first correction data for correcting the color unevenness using the color of the liquid crystal panel corresponding to the other color unevenness correction means is requested to the other color unevenness correction means, and the other color unevenness correction means requests the first correction data. First correction signal generating means for outputting the first correction data when one correction data is requested;
    An uneven color correction apparatus comprising: addition means for adding the first correction data output from the first correction signal generating means to the input video signal.
  2.  請求項1に記載の色むら補正装置において、
     前記複数の色むら補正手段のそれぞれは、
     入力された映像信号に基づいて、該映像信号による投写映像にて輝度むらを減少させる第2の補正データを発生する第2の補正信号発生手段を有し、
     前記加算手段は、入力された映像信号に、前記第1の補正信号発生手段から出力された第1の補正データと、前記第2の補正信号発生手段にて発生した第2の補正データとを加算する色むら補正装置。
    The uneven color correction device according to claim 1,
    Each of the plurality of uneven color correction means includes
    A second correction signal generating means for generating second correction data for reducing luminance unevenness in the projected image based on the input video signal;
    The adding means adds the first correction data output from the first correction signal generating means and the second correction data generated by the second correction signal generating means to the input video signal. Color unevenness correction device to add.
  3.  請求項1または請求項2に記載の色むら補正装置において、
     前記第1の補正信号発生手段は、
     映像表示画面を複数のブロックに分割し、該複数のブロック毎に前記色むらの補正量を記憶した記憶手段と、
     前記記憶手段に記憶された補正量に基づいて前記第1の補正データを要求する補正信号要求手段とを有する色むら補正装置。
    In the color unevenness correction apparatus according to claim 1 or 2,
    The first correction signal generating means includes
    Storage means for dividing the video display screen into a plurality of blocks, and storing the correction amount of the color unevenness for each of the plurality of blocks;
    An uneven color correction apparatus comprising correction signal requesting means for requesting the first correction data based on a correction amount stored in the storage means.
  4.  請求項3に記載の色むら補正装置において、
     前記記憶手段は、前記ブロック毎に、入力された映像信号による明るさに応じた色むらの補正量を記憶している色むら補正装置。
    The uneven color correction device according to claim 3,
    The color unevenness correction apparatus, wherein the storage means stores a color unevenness correction amount corresponding to the brightness of the input video signal for each block.
  5.  請求項3に記載の色むら補正装置において、
     前記補正信号要求手段にて要求される前記第1の補正データについて、入力された映像信号の明るさに応じた振幅を指定する振幅制御手段を有する色むら補正装置。
    The uneven color correction device according to claim 3,
    An uneven color correction apparatus comprising amplitude control means for specifying an amplitude according to the brightness of an input video signal for the first correction data requested by the correction signal request means.
  6.  互いに異なる色を具備する複数の液晶パネルを用いてカラー画像を投写表示する映像表示装置において前記複数の液晶パネルを用いて投写表示される画像における色むらを補正するために各液晶パネルのそれぞれに対応して設けられた複数の色むら補正手段を用いた色むら補正方法であって、
     他の色むら補正手段に対応する液晶パネルの色を用いて前記色むらを補正するための第1の補正データを前記他の色むら補正手段に要求する処理と、
     他の色むら補正手段から前記第1の補正データが要求された場合に該第1の補正データを出力する処理と、
     入力された映像信号に、前記出力された第1の補正データを加算する処理とを有する色むら補正方法。
    In a video display device that projects and displays a color image using a plurality of liquid crystal panels having different colors, each liquid crystal panel is corrected to correct color unevenness in an image projected and displayed using the plurality of liquid crystal panels. A color unevenness correction method using a plurality of color unevenness correction means provided correspondingly,
    A process of requesting the other color unevenness correcting means for first correction data for correcting the color unevenness using the color of the liquid crystal panel corresponding to the other color unevenness correcting means;
    A process of outputting the first correction data when the first correction data is requested from another color unevenness correction unit;
    A method of correcting color unevenness, comprising: adding the output first correction data to an input video signal.
  7.  請求項6に記載の色むら補正方法において、
     入力された映像信号に基づいて、該映像信号による投写映像にて輝度むらを減少させる第2の補正データを発生する処理と、
     入力された映像信号に、前記出力された第1の補正データと、前記第2の補正データとを加算する処理とを有する色むら補正方法。
    The color unevenness correction method according to claim 6,
    Processing for generating second correction data for reducing luminance unevenness in a projected video image based on the input video signal;
    A color unevenness correction method including a process of adding the output first correction data and the second correction data to an input video signal.
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