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Color display device

  • US 9,285,649 B2
  • Filed: 04/18/2014
  • Issued: 03/15/2016
  • Est. Priority Date: 04/18/2013
  • Status: Active Grant
First Claim
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1. A driving method for driving a display layer comprising an electrophoretic medium and having a first surface on the viewing side and a second surface on the opposite side of the first surface, the electrophoretic medium which is sandwiched between a common electrode and a layer of pixel electrodes comprising a first type of particles, a second type of particles, a third type of particles and a fourth type of particles which is additive particles, all dispersed in a solvent or solvent mixture;

  • the first, second and third types of particles having respectively first, second and third optical characteristics differing from one another;

    the first type of particles having a charge of one polarity and the second, third and fourth types of particles having charges of the opposite polarity, and the second type of particles having an electric field threshold;

    the method comprises;

    (a) applying a voltage potential difference between the common electrode and a pixel electrode to generate an electric field stronger than the electric field threshold, and the voltage potential difference has the same polarity as the second type of particles to cause a pixel corresponding to the pixel electrode to display the second optical characteristic at the first surface;

    (b) applying a voltage potential difference between the common electrode and a pixel electrode to generate an electric field stronger than the electric field threshold, and the voltage potential difference has the same polarity as the first type of particles to cause a pixel corresponding to the pixel electrode to display the first optical characteristic at the first surface;

    or (c) once the first optical characteristic is displayed at the first surface, applying a voltage potential difference between the common electrode and a pixel electrode to generate an electric field weaker than the electric field threshold, and the voltage potential difference has the same polarity as the third type of particles to cause a pixel corresponding to the pixel electrode to display the third optical characteristic at the first surface.

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