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IMAGE DISPLAY APPARATUS AND DRIVING METHOD THEREOF, AND IMAGE DISPLAY APPARATUS ASSEMBLY AND DRIVING METHOD THEREOF

  • US 20090315921A1
  • Filed: 06/15/2009
  • Published: 12/24/2009
  • Est. Priority Date: 06/23/2008
  • Status: Active Grant
First Claim
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1. An image display apparatus comprising:

  • (A) an image display panel having a two-dimensional matrix with (P×

    Q) pixels each including a first sub-pixel for displaying a first elementary color, a second sub-pixel for displaying a second elementary color, a third sub-pixel for displaying a third elementary color and a fourth sub-pixel for displaying a fourth color; and

    (B) a signal processing section configured to receivea first sub-pixel input signal provided with a signal value of x1-(p, q),a second sub-pixel input signal provided with a signal value of x2-(p, q) anda third sub-pixel input signal provided with a signal value of x3-(p, q), and to outputa first sub-pixel output signal provided with a signal value of X1-(p, q) and used for determining the display gradation of said first sub-pixel,a second sub-pixel output signal provided with a signal value of X2-(p, q) and used for determining the display gradation of said second sub-pixel,a third sub-pixel output signal provided with a signal value of X3-(p, q) and used for determining the display gradation of said third sub-pixel as well asa fourth sub-pixel output signal provided with a signal value of X4-(p, q) and used for determining the display gradation of said fourth sub-pixelwith regard to a (p, q)th pixel where notations p and q are integers satisfying equations 1≦

    p≦

    P and 1≦

    q≦

    Q,wherein a maximum lightness value Vmax(S) expressed as a function of variable saturation S in an HSV color space enlarged by adding said fourth color is stored in said signal processing section, andsaid signal processing section carries out the following processes of(B-1) finding said saturation S and said lightness value V(S) for each of a plurality of pixels on the basis of the signal values of sub-pixel input signals in said pixels,(B-2) finding an extension coefficient α

    0 on the basis of at least one of ratios Vmax(S)/V(S) found in said pixels,(B-3) finding said output signal value X4-(p, q) in said (p, q)th pixel on the basis of at least said input signal values x1-(p, q), x2-(p, q) and x3-(p, q), and(B-4) finding said output signal value X1-(p, q) in said (p, q)th pixel on the basis of said input signal value x1-(p, q) said extension coefficient α

    0 and said output signal value X4-(p, q), finding said output signal value X2-(p, q) in said (p, q)th pixel on the basis of said input signal value x2-(p, q), said extension coefficient α

    0 and said output signal value X4-(p, q) and finding said output signal value X3-(p, q) in said (p, q)th pixel on the basis of said input signal value x3-(p, q), said extension coefficient α

    0 and said output signal value X4-(p, q).

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