Electro-optic displays with reduced remnant voltage
AssigneeE Ink Corporation
InventorsRussell J. Wilcox, Thomas H. Whitesides, Karl R. Amundson, Guy M. Danner, Richard M. Webber, Charles H. Honeyman, Lan Cao, Richard J. Paolini, Jr., Rajesh Chebiyam
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Abstract
The invention provides materials and methods (including driving methods) for reducing the effects of remnant voltages in electro-optic displays.
Claims8
An electrophoretic medium comprising a suspending fluid, a plurality of a first type of electrically-charged particles held in the suspending fluid and capable of moving therethrough on application of an electric field to the electrophoretic medium, and a plurality of a second type of electrically-charged particles held in the suspending fluid and capable of moving therethrough on application of an electric field to the electrophoretic medium, the particles of the second type having a charge of an opposite polarity to the particles of the first type, wherein the total charge on the particles of the second type is from about one-half to about twice the total charge on the particles of the first type.
An electrophoretic medium comprising a suspending fluid, a plurality of a first type of electrically-charged particles held in the suspending fluid and capable of moving therethrough on application of an electric field to the electrophoretic medium, and a plurality of a second type of electrically-charged particles held in the suspending fluid and capable of moving therethrough on application of an electric field to the electrophoretic medium, the particles of the second type having a charge of an opposite polarity to the particles of the first type, the medium displaying a remnant voltage of less than about 1 Volt one second after the application thereto of a square wave addressing pulse of 15 Volts for 300 milliseconds.
An electrophoretic medium comprising a plurality of discrete droplets of a suspending fluid dispersed in a continuous phase, the droplets further comprising a plurality of electrically-charged particles held in the suspending fluid and capable of moving therethrough on application of an electric field to the electrophoretic medium, wherein the continuous phase has a volume resistivity not greater than about one-half of a volume resistivity of the droplets, and that both the continuous phase and the droplets having a volume resistivity of less than about 1011 ohm cm.
Dependencies are inferred from the claim text.