Driving method of image display device

摘要

An image display device includes an image display panel configured of pixels made up of first, second, third, and fourth sub-pixels being arrayed in a two-dimensional matrix shape, and a signal processing unit into which an input signal is input and from which an output signal based on an extension coefficient is output, and causes the signal processing unit to obtain a maximum value of luminosity with saturation S in the HSV color space enlarged by adding a fourth color, as a variable, and to obtain a reference extension coefficient based on the maximum value, and further to determine an extension coefficient at each pixel from the reference extension coefficient, an input signal correction coefficient based on the sub-pixel input signal values at each pixel, and an external light intensity correction coefficient based on external light intensity.

主权项

1. A driving method of an image display device including
an image display panel configured of
pixels being arrayed in a two-dimensional matrix shape in a first direction and a second direction, each of which is made up of
a first sub-pixel for displaying a first primary color,a second sub-pixel for displaying a second primary color, anda third sub-pixel for displaying a third primary color,a pixel group being made up of at least a first pixel and a second pixel arrayed in the first direction, anda fourth sub-pixel for displaying a fourth color being disposed between a first pixel and a second pixel at each pixel group, and a signal processing unit,the method causing the signal processing unit
with regard to a first pixel
to obtain a first sub-pixel output signal based on at least a first sub-pixel input signal and an extension coefficient α0 to output to the first sub-pixel,to obtain a second sub-pixel output signal based on at least a second sub-pixel input signal and the extension coefficient α0 to output to the second sub-pixel, andto obtain a third sub-pixel output signal based on at least a third sub-pixel input signal and the extension coefficient α0 to output to the third sub-pixel, and with regard to a second pixel
to obtain a first sub-pixel output signal based on at least a first sub-pixel input signal and the extension coefficient α0 to output to the first sub-pixel,to obtain a second sub-pixel output signal based on at least a second sub-pixel input signal and the extension coefficient α0 to output to the second sub-pixel, andto obtain a third sub-pixel output signal based on at least a third sub-pixel input signal and the extension coefficient α0 to output to the third sub-pixel, and with regard to a fourth sub-pixel
to obtain a fourth sub-pixel output signal based on a fourth sub-pixel control first signal obtained from the first sub-pixel input signal, the second sub-pixel input signal, and the third sub-pixel input signal as to the first pixel, a fourth sub-pixel control second signal obtained from the first sub-pixel input signal, the second sub-pixel input signal, and the third sub-pixel input signal as to the second pixel, to output the fourth sub-pixel;the method comprising:
obtaining the maximum value Vmax of luminosity at the signal processing unit with saturation S in the HSV color space enlarged by adding a fourth color, as a variable; obtaining a reference extension coefficient α0-std at the signal processing unit based on the maximum value Vmax; and determining an extension coefficient α0 at each pixel according to the following expression (i) using the reference extension coefficient α0-std, an input signal correction coefficient kIS based on the sub-pixel input signal values at each pixel, and an external light intensity correction coefficient kOL based on external light intensity;
α0=α0-std×(kIS×kOL+1)  (i), wherein the saturation S and luminosity V(S) are represented with
S=(Max−Min)/MaxV(S)=Maxwhere Max denotes the maximum value of three sub-pixel input signal values of a first sub-pixel input signal value, a second-sub pixel input signal value, and a third sub-pixel input signal value as to a pixel, and
Min denotes the minimum value of three sub-pixel input signal values of the first sub-pixel input signal value, the second-sub pixel input signal value, and the third sub-pixel input signal value as to the pixel.