DRIVING WAVEFORMS FOR SWITCHABLE LIGHT-COLLIMATING LAYER INCLUDING BISTABLE ELECTROPHORETIC FLUID
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United States of America
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Issued Date -
Feb 13, 2020
app pub date -
Aug 9, 2019
filing date -
Aug 9, 2019
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Abstract
Methods and controllers for driving a light-collimating film including elongated chambers of bistable electrophoretic fluids. The light-collimating films are suitable to control the amount and/or direction of light incident to a transmissive substrate. Such films may be integrated into devices, such as LCD displays, to provide a zone of privacy for a user viewing the LCD display. Because the light-collimating film is switchable, it allows a user to alter the collimation of the emitted light on demand. Because the films are bistable, they do not require additional power after they have been switched to a display state.
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