Electro-optic displays
First Claim
1. An electrophoretic display comprising:
- an electrophoretic medium having a plurality of charged particles suspended in a suspending fluid, andtwo electrodes disposed on opposed sides of the electrophoretic medium, at least one of the electrodes being light-transmissive and forming a viewing surface through which an observer can view the display,the display having a closed optical state in which the charged particles are spread over substantially the entire viewing surface so that light cannot pass through the electrophoretic medium, and an open optical state in which the electrophoretic particles form chains extending between the electrodes so that light can pass through the electrophoretic medium,the display further comprising insulating layers disposed between the electrodes and the electrophoretic medium.
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Accused Products
Abstract
An electrophoretic display comprises an electrophoretic medium having a plurality of charged particles suspended in a suspending fluid, and two electrodes disposed on opposed sides of the electrophoretic medium. At least one of the electrodes is light-transmissive and forming a viewing surface. The display has a closed optical state in which the charged particles are spread over substantially the entire viewing surface so that light cannot pass through the medium, and an open optical state in which the electrophoretic particles form chains extending between the electrodes so that light can pass through the electrophoretic medium. Insulating layers are disposed between the electrodes and the electrophoretic medium. Similarly electrophoretic displays are provided equipped with color filter arrays or reflectors.
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Citations
24 Claims
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1. An electrophoretic display comprising:
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an electrophoretic medium having a plurality of charged particles suspended in a suspending fluid, and two electrodes disposed on opposed sides of the electrophoretic medium, at least one of the electrodes being light-transmissive and forming a viewing surface through which an observer can view the display, the display having a closed optical state in which the charged particles are spread over substantially the entire viewing surface so that light cannot pass through the electrophoretic medium, and an open optical state in which the electrophoretic particles form chains extending between the electrodes so that light can pass through the electrophoretic medium, the display further comprising insulating layers disposed between the electrodes and the electrophoretic medium. - View Dependent Claims (2, 3, 4)
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5. An electrophoretic display having a plurality of pixels and comprising:
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an electrophoretic medium having a plurality of charged particles in a fluid, and electrodes disposed on opposed sides of the electrophoretic medium, at least one of the electrodes being light-transmissive and forming a viewing surface through which an observer can view the display, each pixel of the display having a closed optical state in which the charged particles are spread over substantially the entire viewing surface of the pixel so that light cannot pass through the electrophoretic medium, and an open optical state in which the electrophoretic particles form chains extending between the electrodes of the pixel so that light can pass through the pixel, the display further comprising a color array adjacent the display so as to be visible to the observer, such that the color of the display perceived by the observer can be varied by changing the open and closed optical states of the various pixels of the display. - View Dependent Claims (6, 7, 8, 9, 10, 11, 16, 17, 18, 19, 23, 24)
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12. An electrophoretic display having a plurality of pixels and comprising:
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an electrophoretic medium having a plurality of charged particles in a fluid, and electrodes disposed on opposed sides of the electrophoretic medium, at least one of the electrodes being light-transmissive and forming a viewing surface through which an observer can view the display, each pixel of the display having a closed optical state in which the charged particles are spread over substantially the entire viewing surface of the pixel so that light cannot pass through the electrophoretic medium, and an open optical state in which the electrophoretic particles form chains extending between the electrodes of the pixel so that light can pass through the pixel, the display further comprising a color array adjacent the display so as to be visible to the observer, such that the color of the display perceived by the observer can be varied by changing the open and closed optical states of the various pixels of the display, and insulating layers disposed between the electrodes and the electrophoretic medium. - View Dependent Claims (13, 14, 15)
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20. An electrophoretic display having a plurality of pixels and comprising:
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an electrophoretic medium having a plurality of charged particles in a fluid, and electrodes disposed on opposed sides of the electrophoretic medium, at least one of the electrodes being light-transmissive and forming a viewing surface through which an observer can view the display, each pixel of the display having a closed optical state in which the charged particles are spread over substantially the entire viewing surface of the pixel so that light cannot pass through the electrophoretic medium, and an open optical state in which the electrophoretic particles form chains extending between the electrodes of the pixel so that light can pass through the pixel, the display further comprising a color array adjacent the display so as to be visible to the observer, such that the color of the display perceived by the observer can be varied by changing the open and closed optical states of the various pixels of the display, and voltage supply means for applying voltages to the two electrodes, the voltage supply means being arranged to supply both a high frequency alternating current voltage effective to drive the display to its open optical state and a low frequency alternating or direct current voltage effective to drive the display to its closed optical state. - View Dependent Claims (21, 22)
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Specification