Tunable lenses for spectacles
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United States of America Patent
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Jun 14, 2022
Grant Date -
Apr 18, 2019
app pub date -
Jun 13, 2017
filing date -
Jun 16, 2016
priority date (Note) -
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status (Latency Note)
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Abstract
Optical apparatus (20) includes a transparent envelope (26) configured to be mounted in a spectacle frame. An electro-optical layer (46) is contained within the envelope, with an array of transparent excitation electrodes (50) disposed over a first surface of the transparent envelope. A transparent common electrode (52) is disposed over a second surface of the transparent envelope, opposite the first surface, and is electrically separated into a central region defining an active area (24) of the electro-optical layer and a peripheral region, which at least partially surrounds the central region. Control circuitry (72, 82, 92) holds the central region of the transparent common electrode at a predefined common voltage while allowing the peripheral region to float electrically, and to apply control voltage waveforms to the excitation electrodes, relative to the common voltage, so as to generate a specified phase modulation profile in the active area of the electro-optical layer.
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