Stabilization for privacy display
AssigneeRealD Spark, LLC
InventorsJonathan Harrold, Graham J. Woodgate, Robert Ramsey
Life of this patent
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Abstract
A display comprises a polarised output spatial light modulator, switchable liquid crystal retarder, absorbing polariser and touch panel electrodes. The switchable liquid crystal layer is stabilised by a cured reactive mesogen material during application of an applied voltage. Light scatter in privacy mode is reduced and visual security level enhanced. Visibility of disclinations during application of applied pressure, for example from a finger on a touch screen is minimised.
Claims25
A display device comprising:
- a spatial light modulator;
- 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;
- and
- at least one polar control retarder arranged between the additional polariser and the display polariser,
- wherein the at least one polar control retarder comprises a switchable liquid crystal retarder comprising:
- first and second support substrates;
- a liquid crystal layer disposed between the first and second transparent support substrates, the liquid crystal layer comprising non-curable liquid crystal material and cured polymer material;
- electrodes arranged to apply a voltage for controlling the liquid crystal layer;
- and
- respective liquid crystal alignment layers supported on the first and second the support substrates adjacent the liquid crystal layer for aligning the non-curable liquid crystal material.
A method of manufacturing a switchable liquid crystal retarder which is a polar control retarder for a display device, the method comprising:
- providing first and second support substrates having electrodes for controlling a liquid crystal layer and having first and second liquid crystal alignment layers supported thereon for aligning liquid crystal material of the liquid crystal layer;
- disposing a liquid crystal layer disposed between the first and second transparent support substrates with the first and second liquid crystal alignment layers adjacent the liquid crystal layer, the liquid crystal layer comprising non-curable liquid crystal material and curable liquid crystal material;
- and
- curing the curable liquid crystal material while applying a predetermined voltage to the electrodes.
Dependencies are inferred from the claim text.