Switchable retardation device with reduced residual retardation

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United States of America Patent

PATENT NO 11435641
SERIAL NO

17137916

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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A switchable optical retardation device includes a switchable retardation element including liquid crystals and an electrical driver circuit. While in a first state, the switchable retardation element modifies light transmitted through the switchable retardation element by causing a phase shift of a first retardation angle. While in a second state, the switchable retardation element modifies the light transmitted through the switchable retardation element by causing a phase shift of a second retardation angle distinct from the first retardation angle. The electrical driver circuit provides a first voltage for placing the switchable retardation element in the first state and a second voltage for placing the switchable retardation element in the second state. The first voltage is greater than the second voltage, the second voltage is a non-zero voltage, and the electrical driver circuit alternatingly provides the first voltage and the second voltage with a predefined frequency.

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Patent Owner(s)

  • META PLATFORMS TECHNOLOGIES, LLC

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Boromand, Arman Redmond, US 49 19
Jamali, Afsoon Redmond, US 62 62
Pintz, Sandro Menlo Park, US 12 25
Sears, Jasmine Soria Kirkland, US 46 119

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