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Color display device

  • US 9,541,814 B2
  • Filed: 02/19/2015
  • Issued: 01/10/2017
  • Est. Priority Date: 02/19/2014
  • Status: Active Grant
First Claim
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1. An electrophoretic display comprising a first surface on a viewing side, a second surface on a non-viewing side, and an electrophoretic fluid sandwiched between a common electrode at the viewing side and a layer of pixel electrodes at the non-viewing side;

  • the electrophoretic fluid comprising a first type of particles, a second type of particles, a third type of particles, a fourth type of particles and a fifth type of particles, all of which are dispersed in a solvent or solvent mixture, wherein;

    (a) the five types of pigment particles have optical characteristics differing from one another;

    (b) the first and second types of particles carry opposite charge polarities;

    (c) the third and fourth types of particles carry the same charge polarity as the first type of particles, and the first type, the third type and the fourth type of particles have progressively lower magnitudes; and

    (d) the fifth type of particles carries the same charge polarity as the second type of particles, but their magnitude is lower than that of the second type of particles; and

    wherein application, to a pixel, of a mid-driving voltage causes a mixture of the particles of the first type and second type to stay in middle of the pixel and causes the particles of the third type to break away from the mixture and move at or near the viewing side; and

    wherein the application of the mid-driving voltage further causes the particles of the fifth type to break away from the mixture and move at or near the pixel electrode.

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