Directional display apparatus
AssigneeRealD Spark, LLC
InventorsGraham J. Woodgate, Michael G. Robinson
Life of this patent
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Abstract
A dual view display for an automotive vehicle comprises a spatial light modulator and a polar control retarder comprising a switchable liquid crystal retarder arranged between a first pair of polarisers. The switchable liquid crystal retarder comprises a polarisation-switch retarder and a polar control retarder with an average director that is directed towards an off-axis viewing location. In a first temporal phase of operation, the spatial light modulator and polar control retarder are arranged to direct light comprising a first image towards a first direction and in a second temporal phase of operation to direct light comprising a second image towards a second direction.
Claims26
A display device comprising:
- a spatial light modulator arranged to output spatially modulated light;
- a display polariser arranged on a side of the spatial light modulator, the display polariser being a linear polariser;
- and
- a view angle control arrangement comprising:
- an additional polariser arranged on the same side of the spatial light modulator as the display polariser, the additional polariser being a linear polariser;
- and
- at least one polar control retarder and a polarisation-switch retarder arranged between the display polariser and the additional polariser,
- wherein
- the polarisation-switch retarder is switchable between a first mode in which the polarisation-switch retarder is arranged to output a first polarisation state and a second mode in which the polarisation-switch retarder is arranged to output a second polarisation state orthogonal to the first polarisation state, and
- the view angle control arrangement and display polariser have a profile of transmission by angle having a local minimum in a first direction in the first mode and a local minimum in a second direction in the second mode.
Dependencies are inferred from the claim text.