Quote:
Originally Posted by Sil_liS
If you apply a voltage between two plates and place a charged particle between them the particle would move towards the plate with the opposite charge with a constant acceleration which is proportional with the strength of the electrical field between the plates. For example you would have negative charges on one plate, a negatively charged particle and positive charges on the other plate so the particle moves away from the negative charges on one plate and towards the positive charges on the other plate. In the case of eink you have many charged particles between the plates and they will have an effect on the strength of the field.
In the case of ghosts you had the charges move between the plates so if you apply the same voltage you have negative charges on a plate, positive charged particles inside the capsule on that side of the plate, a mixture of positive and negative charged particles in the middle, negative charged particles on the other side of the capsule then the positive charges on the other plate. The particles in the middle are going to move very slowly towards the plates with the opposite charge because in effect the electric field is lower.
If you apply voltage with the opposite sign, then the charged particles on the side of the plates will have the the same signs as the charges on the plates and the charged particles will be under a stronger field and move faster.
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I guess this makes sense if you assume that they apply some voltage for some specific amount of time that is tailored to shift a pixel from one grayscale value to another. If the pixel is actually displaying a different grayscale colour to start with than the driver thinks it should be (like in the ghosted regions), then the resulting pixel colour will be wrong. A full refresh means driving each pixel to full black or full white (i.e. a known state), and then applying the fine-tuned electric field to produce the final desired grayscale colour value. Does that sound right?