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AssigneeRealD Spark, LLC
InventorsJonathan Harrold, Michael G Robinson, Graham J. Woodgate
Estimating the term…
A switchable privacy display comprises a spatial light modulator and a compensated switchable guest-host liquid crystal retarder arranged between an output display polariser of the spatial light modulator and an additional polariser. A reflective polariser is arranged between the guest-host liquid crystal retarder and the output display polariser. In privacy mode, on-axis light from the spatial light modulator is directed without loss, whereas off-axis light has reduced luminance. The visibility of the display to off-axis snoopers is reduced by luminance reduction and reflection increase over a wide polar field. The colour of the reflected light may be modified by selection of the spectral absorption of the guest material in correspondence to the spectral transmission of the additional polariser. An aesthetically desirable display appearance may be achieved in privacy mode from non-viewing directions. In wide-angle mode, the switchable liquid crystal retardance is adjusted so off-axis luminance and reflectance is substantially unmodified.
A display device comprising:
Dependencies are inferred from the claim text.