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US 11,454,853 B2Granted
Optical stack for privacy display
AssigneeRealD Spark, LLC
InventorsGraham J. Woodgate, Michael G. Robinson, Jonathan Harrold, Robert A. Ramsey, Ben Ihas
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Abstract
A switchable privacy display apparatus comprises a spatial light modulator, a light control film, and a polar control retarder that comprises plural retarders arranged between a display polariser of the spatial light modulator and an additional polariser. The display achieves high image visibility to an off-axis user in a public mode of operation and high image security to an off-axis snooper in privacy mode of operation.
Claims31
A display device comprising:
- a spatial light modulator arranged to output spatially modulated light, the spatial light modulator including a display polariser arranged on a side of the spatial light modulator, the display polariser being a linear polariser;
- an additional polariser arranged on the same side of the spatial light modulator as the display polariser, the additional polariser being a linear polariser;
- at least one switchable liquid crystal retarder arranged between the additional polariser and the display polariser, and
- a light control film arranged in series with the spatial light modulator, the additional polariser and the at least one switchable liquid crystal retarder,
- wherein the light control film comprises an input surface, an output surface facing the input surface, an array of transmissive regions extending between the input surface and the output surface, and absorptive regions between the transmissive regions and extending at least partway between the input surface and the output surface.
2 more elements
Dependencies are inferred from the claim text.