Display with three regions of color space
A pixelated color display where the emission corresponds to a color space comprised of three regions: an outer boundary of the entire color space which is defined by the most saturated colors; an inner region formed by less saturated colors which is defined by an inner region boundary; and between the inner region boundary and the outer boundary, an intermediate region where at least one color is approximated by dithering between a most saturated color and a less saturated color. The dithering can be color spatial, temporal, or physical spatial dithering or combinations thereof. The display is an OLED, preferably a multimodal (white light-emitting) microcavity with a color filter array and can have 3 or more stacks of light-emitting units. The color dithering in the intermediate region allows for generation of colors that cannot be emitted directly by the display.
1 . A pixelated color display where the emission, according to an image signal, corresponds to a color space comprised of three regions: an outer boundary of the entire color space according to the most saturated colors; an inner region formed by less saturated colors which has an inner region boundary; and between the inner region boundary and the outer boundary, an intermediate region where at least one color is generated by dithering between a most saturated color along the outer boundary and a less saturated color along the inner region boundary or within the inner region;
where each pixel has at least three independently addressed subpixels and the colors within the intermediate region are generated by dithering between a most saturated color where at least one subpixel is below its luminance threshold and a less saturated color where all subpixels have an emission above their luminance threshold, where the luminance threshold corresponds to an image signal of no emission for that subpixel.
2 . The display of claim 1 where the dithering is a temporal dithering method involving combining different ratios of the most saturated color and the less saturated color in a pattern over time.
3 . The display of claim 2 where the temporal dithering in which colors are combined by alternating emission of the most saturated color for a period of time with the emission of the less saturated color within one single time frame.
4 . The display of claim 2 where the temporal dithering in which the most saturated color and the less saturated color are emitted in alternating time frames.
5 . The display of claim 4 where the temporal dithering in which the duration of the individual time frame over which the most saturated color and the less saturated color emit differ from each other.
6 . The display of claim 1 where the dithering is a spatial dithering method involving color mapping of a color within the intermediate region to either the most saturated color or to the less saturated color.
7 . The display of claim 1 where the dithering is a spatial dithering in which colors within the intermediate region are combined in a spatial neighborhood of pixels by placing them in a spatially alternating pattern.
8 . The display of claim 1 wherein the most saturated color and the less saturated color lie on the same hue axis.
9 . The display of claim 1 wherein the less saturated color used for dithering in the intermediate region is a color located along the inner region boundary.
10 . The display of claim 1 wherein the display is an OLED display.
11 . The display of claim 10 where the display is a multimodal white light-emitting microcavity OLED with a color filter array and has three or more stacks of light-emitting units.
12 . The display of claim 1 where there are three subpixels which emit red, green and blue light or where there are four subpixels which emit red, green, blue and white light.
13 . The color display of claim 1 , comprising an image controller which, based on the image signal, generates colors within an intermediate region by dithering between the most saturated color, where at least one subpixel is below a luminance threshold, and the less saturated color, where all subpixels have an emission above a luminance threshold.