Devices and techniques for electronically erasing a drawing device
First Claim
1. An electronically-erasable drawing device comprising:
- an electro-optic display, including;
an electrophoretic display medium comprising a first set of charged particles having a first polarity, a second set of charged particles having a second polarity opposite of the first polarity, and a third set of magnetic particles that are not charged, wherein the first, second, and third sets of particles are in a fluid, and the first set of charged particles and the second set of charged particles move within the fluid in response to an applied electric field, and the third set of magnetic particles moves within the fluid in response to an applied magnetic field, and the display medium is capable of displaying three extreme optical states and a state intermediate the three extreme optical states,interdigitated electrodes disposed adjacent one surface of the electrophoretic display medium and no electrodes disposed on an a drawing surface side of the electrophoretic medium, wherein the drawing surface side is adjacent a second surface of the electrophoretic medium opposite from the interdigitated electrodes, anda voltage controller for controlling the potential of the interdigitated electrodes and capable of applying to the interdigitated electrodes voltages such that a fringing field is presented to the electro-optic medium that drives at least a portion of the electro-optic display medium to the state intermediate the three extreme optical states; and
a stylus including two independently addressable stylus electrodes, wherein the voltage controller is arranged to control an electromagnetic difference between at least one of the interdigitated electrodes and at least one of the stylus electrodes to alter the optical state of a portion of the display medium.
1 Assignment
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Accused Products
Abstract
Devices and techniques for electronically erasing an externally addressed electrophoretic drawing device are described. An electronically-erasable drawing device comprises an electro-optic display medium and interdigitated electrodes disposed adjacent one surface of the medium and configured to drive the medium to an intermediate (gray) optical state. A mobile electronic drawing implement may include electrodes configured to apply a fringing electric field to an electro-optic display medium from one side of the medium, the fringing electric field being arranged to drive a portion of the display medium adjacent the implement to an intermediate optical state, the electrodes being movable relative to the medium.
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Citations
16 Claims
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1. An electronically-erasable drawing device comprising:
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an electro-optic display, including; an electrophoretic display medium comprising a first set of charged particles having a first polarity, a second set of charged particles having a second polarity opposite of the first polarity, and a third set of magnetic particles that are not charged, wherein the first, second, and third sets of particles are in a fluid, and the first set of charged particles and the second set of charged particles move within the fluid in response to an applied electric field, and the third set of magnetic particles moves within the fluid in response to an applied magnetic field, and the display medium is capable of displaying three extreme optical states and a state intermediate the three extreme optical states, interdigitated electrodes disposed adjacent one surface of the electrophoretic display medium and no electrodes disposed on an a drawing surface side of the electrophoretic medium, wherein the drawing surface side is adjacent a second surface of the electrophoretic medium opposite from the interdigitated electrodes, and a voltage controller for controlling the potential of the interdigitated electrodes and capable of applying to the interdigitated electrodes voltages such that a fringing field is presented to the electro-optic medium that drives at least a portion of the electro-optic display medium to the state intermediate the three extreme optical states; and a stylus including two independently addressable stylus electrodes, wherein the voltage controller is arranged to control an electromagnetic difference between at least one of the interdigitated electrodes and at least one of the stylus electrodes to alter the optical state of a portion of the display medium. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification