Optical stack for privacy display
Number of patents in Portfolio can not be more than 2000
United States of America
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N/A
Issued Date -
Jan 2, 2020
app pub date -
Jun 21, 2019
filing date -
Jun 21, 2019
priority date (Note) -
Published
status (Latency Note)
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Abstract
A switchable privacy display apparatus comprises a polarised output spatial light modulator, and an additional polariser. A reflective polariser, switchable liquid crystal polar control retarder, passive polar control retarders and air gap are arranged between the display output polariser and additional polariser. The passive retarders are arranged to provide no phase difference to polarised light from the spatial light modulator for on-axis light; and simultaneously provide a non-zero phase difference for polarised light in off-axis directions. The polar control retarders are further arranged to achieve low reflectivity for light propagating through the air gap. A switchable privacy display that can be conveniently assembled at low cost can be provided with high contrast images for display users while maintaining high visual security level for off-axis snoopers.
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