Quote:
Originally Posted by geekmaster
Each kindle screen has custom tuning parameters stored in a ROM chip on the flex cable attached to the screen. It is possible that a screen may have been miscalibrated, or was not at the "standard" 25C temperature when it was originally calibrated, or perhaps the viscosity of the oil changed over time.
I noticed with my kindles that they improve with "exercise". There is less contrast and more ghosting for awhile when they have been unused for some time. Forcing the white zinc oxide particles to move through the oil warms it from friction. Cycling the pixels like this may also help separate white particles that may be stuck to the beads or stuck to each other.
I have 7 kindles (for software testing), and some of them get neglected for awhile. Also when they are cold (below body temperature), it makes a HUGE difference. When cold they can do different shades of "medium gray".
Store your "not so good" kindle in a warm place for a bit to "soften" the oil in the display, then test it again.
To some people the K4 and Touch may APPEAR to be lower contrast than the K3 and DXG, because of reflected light off the silver bezel affecting visual perception. Putting a "graphite" skin on the K4NT and Touch may make them appear to be higher contrast.
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My understanding for most of people's complained in this thread is that some claim to notice literally "whiter" background on K3 than the K4 under any circumstances(although from my testing of 4x KT, 1x K4 & 2x K3, they're identical), including having done a full refresh, not just the texts rendering or contrast difference. Since the background is the off state for the eInk display, it should have nothing to do with the software settings or temperature when compared side by side.