Optical stack for directional display
AssigneeRealD Spark, LLC
InventorsMichael G. Robinson, Graham J. Woodgate, Robert A. Ramsey, Jonathan Harrold
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Abstract
A privacy display comprises a spatial light modulator and a passive retarder arranged between first and second polarisers arranged in series with the spatial light modulator. On-axis light from the spatial light modulator is directed without loss, and off-axis light has reduced luminance. The visibility of the display to off-axis snoopers is reduced by means of luminance reduction over a wide polar field of view. Off-axis visibility of the display in an automotive vehicle can be reduced.
Claims47
A display device comprising:
- a spatial light modulator;
- at least one display polariser arranged on a side of the spatial light modulator;
- an additional polariser arranged on the same side of the spatial light modulator as the display polariser;
- and
- at least one passive retarder arranged between the additional polariser and the display polariser.
A view angle control optical element for application to a display device comprising a spatial light modulator and a display polariser, the view angle control optical element comprising:
- control polariser and at least one passive retarder for arrangement between the control polariser and the display polariser on application of the view angle control optical element to the display device.
Dependencies are inferred from the claim text.