Plasma, VFD, CRT, real LED and OLED/AMOLED use R, G, B emission, though OLED/AMOLED are not real LEDs so often also have filters too.ĭLP come in two kinds. LCD twists polarisation of light and uses polarising film, so it varies from transparent to black, though a single colour is possible, the physics doesn't allow layers that vary from transparent to complementary colour, so all LCDs are monochrome with RGB filters on top. No electronic C Y M layer technology yet exists. So White (or black on negatives) has no dye/colour and lets all the light through. Also black on printing) in layers rather than side by side R G B dots. Printing, film negatives and colour slides use C Y M (cyan, yellow and Magenta. It's basic physics and the trick of how fake RGB colour takes advantage of how our eyes work if you have average colour vision. Though direct sunlight will work well with no frontlight. Otherwise you need twice the front light power of an LCD backlight. So decent white, not too grey needs poorer filters (more transparent) which results in poor range of colours and pastel shades. Not a problem for LCD, just increase the backlight. Then since the light is reflected off the milky white liquid, the coloured light is attenuated twice by the filter. In practice that would not be possible and the R G B mix technique to give white and decent colour saturation and range of hues requires that each R, G, B subpixel blocks about 7/8ths of spectrum at least. So it makes the white 2/3 rds dimmer (greyer) if the filter was 1/3 rd of spectrum for each pixel. If the balls in a cell stick to the front then it's black.Ĭolour is usually by a filter printed on the front of the screen/cells. The background is a milky liquid the tiny black balls are in.
ILLUMINATED BY YOU IREADER FULL
LCDs use filters so can't manage as perfect saturations.ĭoes a colour screen actually increase the contrast?īecause right now every ereaders background is gray, the font is black but can colour screens make the background purely white?Įdit: Short answer is that, full colour makes the greyish white even greyer on eInk! We are not having so much discernment on saturations, likely existing displays are better than our eye and the CRT, plasma and OLED 100% saturations mostly don't exist in nature / real life. Most people can separate maybe over a million hues and a bigger range of brightness than any display.
I agree that programmatically there are 4096 distinct "Colours", including the greys and variations of brigtenesses and saturations. Some will shift in apparent colour to olives or oranges etc. There are 15 saturations of R, G, B, Yellow, Cyan, Magenta. Yes, I realised after I posted that the math was wrong, but I don't think 16 x16 x 16 is quite right as one shade is black, one is "white" and the darkest colours and palest colours may be indistinguishable from darkest grey and brightest grey.
The colour range would be from 0x0000 to 0x0FFF. I don't agree on the math - the correct number of potential colours is given by 16x16x16 which does give the 4096 total number of colours.
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