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Originally Posted by Barty
Btw, why is the background of eink type display so gray? While it may not be desirable to have it completely white, the gray is hardly optimal and must be an inherent limitation at this stage of development.
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Limitations of the technology. As said, there are capsules of pigment that are charged negatively or positively. Positive charge shows white pigment, negative shows black pigment. However, sometimes a capsule doesn't entirely lose its charge, and will be stuck for a bit, ending up with a greyish color being apparent. You sometimes will see a faint "ghost" image on a display of text that was previously there. Newer displays are better about this. Also, another limitation, is that due to containing both color pigment capsules in a transparent substrate, light will sometimes shine through and reflect off the color pigment that is being hidden. Again, this has also been improved with newer displays.