Electrophoretic display fluid
First Claim
1. A display device comprising a plurality of display cells, wherein each of said display cells is filled with an electrophoretic display fluid, which electrophoretic display fluidA. comprises (i) a white non-mobile or semi-mobile phase, (ii) a first type of charged pigment particles which are black, (iii) a second type of charged pigment particles which are colored and transparent or opaque, and (iv) a solvent or solvent mixture;
- wherein said non-mobile or semi-mobile phase and the two types of charged pigment particles are dispersed in the solvent or solvent mixture, and the two types of charged pigment particles are oppositely charged, andB is sandwiched between a common electrode which is on the viewing side and at least two pixel electrodes,whereby a black color is displayed when the first type of charged pigment particles is driven to the common electrode, a color of the colored and transparent or opaque charged pigment particles is displayed when the second type of charged pigment particles is driven to the common electrode, and a white color is displayed when the first and the second types of charged pigment particles are driven to separate pixel electrodes.
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Abstract
This invention relates to an electrophoretic display fluid comprising a non-mobile or semi-mobile phase and two types of charged pigment particles dispersed in a solvent or solvent mixture, and an electrophoretic display device utilizing such an electrophoretic display fluid. The electrophoretic fluid of the present invention provides improved image qualities.
117 Citations
16 Claims
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1. A display device comprising a plurality of display cells, wherein each of said display cells is filled with an electrophoretic display fluid, which electrophoretic display fluid
A. comprises (i) a white non-mobile or semi-mobile phase, (ii) a first type of charged pigment particles which are black, (iii) a second type of charged pigment particles which are colored and transparent or opaque, and (iv) a solvent or solvent mixture; - wherein said non-mobile or semi-mobile phase and the two types of charged pigment particles are dispersed in the solvent or solvent mixture, and the two types of charged pigment particles are oppositely charged, and
B is sandwiched between a common electrode which is on the viewing side and at least two pixel electrodes, whereby a black color is displayed when the first type of charged pigment particles is driven to the common electrode, a color of the colored and transparent or opaque charged pigment particles is displayed when the second type of charged pigment particles is driven to the common electrode, and a white color is displayed when the first and the second types of charged pigment particles are driven to separate pixel electrodes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
- wherein said non-mobile or semi-mobile phase and the two types of charged pigment particles are dispersed in the solvent or solvent mixture, and the two types of charged pigment particles are oppositely charged, and
Specification