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1. A driving method for an image display apparatus which includes
(A) an image display panel wherein pixels each including a first subpixel for displaying a first primary color, a second subpixel for displaying a second primary color, a third subpixel for displaying a third primary color and a fourth subpixel for displaying a fourth color are arrayed in a two-dimensional matrix; and (B) a signal processing section; the signal processing section being capable of
determining a first subpixel output signal at least based on a first subpixel input signal and an expansion coefficient α0 and outputting the first subpixel output signal to the first subpixel;determining a second subpixel output signal at least based on a second subpixel input signal and the expansion coefficient α0 and outputting the second subpixel output signal to the second subpixel; anddetermining a third subpixel output signal at least based on a third subpixel input signal and the expansion coefficient α0 and outputting the third subpixel output signal to the third subpixel; the driving method being carried out by the signal processing section and comprising:
(a) determining a maximum value Vmax(S) of brightness taking a saturation S in an HSV color space enlarged by adding the fourth color as a variable, HSV of the HSV color space standing for hue, saturation and brightness value;(b) determining the saturation S and the brightness V(S) of a plurality of pixels based on subpixel input signal values to the plural pixels;(c) determining the expansion coefficient α0 based on at least one of values of Vmax(S)/V(S) determined with regard to the plural pixels;(d) for each of the pixels
determining a first correction signal value based on the expansion coefficient αo, the first subpixel input signal and a first constant;determining a second correction signal value based on the expansion coefficient α0, the second subpixel input signal and a second constant;determining a third correction signal value based on the expansion coefficient α0, the third subpixel input signal and a third constant;determining a correction signal value having a maximum value from among the first, second and third correction signal values as a fourth correction signal value; anddetermining a fifth correction signal value based on the expansion coefficient α0 and a minimum value from among the first subpixel input signal, the second subpixel input signal and the third subpixel input signal; and(e) determining, for each of the pixels, a fourth subpixel output signal from the fourth and fifth correction signal values and outputting the determined signal to the fourth subpixel.
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