Electrophoretic display with dual mode switching
First Claim
1. An electrophoretic display comprising an array of electrophoretic cells wherein each of said electrophoretic cells comprisesa) a top layer comprising a top electrode,b) a bottom layer comprising a bottom electrode and at least one in-plane electrode,c) opaque partition walls,d) a cell background, ande) an electrophoretic composition filled therein which electrophoretic composition comprises charged pigment particles of the same color and carrying the same charge polarity dispersed in a dyed dielectric solvent or solvent mixture,whereby the charged pigment particles are capable of moving in a vertical or planar direction.
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Abstract
The present invention relates to an improved EPD which comprises both the traditional up/down switching and the in-plane switching modes. The monochrome EPDs of the present invention are capable of displaying highlight color of choice which is different from the text. For example, white background, blue text, and red highlight can be shown in any selected areas of the display. Furthermore, the full color EPDs of the present invention are capable of displaying high contrast images of high color saturation. Both high quality black and white states are possible in the full color displays of the present invention. The EPDs of the present invention do not need complex circuitry design, and are compatible with low cost and high yield roll-to-roll manufacturing processes. The EPD cells of the present invention may have opaque partition walls, or a black matrix top surface of the partition walls or a combination thereof.
181 Citations
19 Claims
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1. An electrophoretic display comprising an array of electrophoretic cells wherein each of said electrophoretic cells comprises
a) a top layer comprising a top electrode, b) a bottom layer comprising a bottom electrode and at least one in-plane electrode, c) opaque partition walls, d) a cell background, and e) an electrophoretic composition filled therein which electrophoretic composition comprises charged pigment particles of the same color and carrying the same charge polarity dispersed in a dyed dielectric solvent or solvent mixture, whereby the charged pigment particles are capable of moving in a vertical or planar direction.
Specification