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US 2021/0063799 A1Published application
Touch screen for privacy display
AssigneeRealD Spark, LLC
InventorsJonathan Harrold, Graham J. Woodgate
Life of this patent
Estimating the term…
Abstract
A display comprises a polarised output spatial light modulator, switchable liquid crystal retarder, absorbing polariser and touch panel electrodes. The electrodes of the switchable liquid crystal retarder shield the touch panel electrodes from the electrical noise of the spatial light modulator addressing. The touch panel control and sensing may be synchronised with the driving signal of the switchable liquid crystal retarder. The touch panel may be operated independently of the timing of the data addressing of the spatial light modulator.
Claims34
1-32. (canceled)
A touch input display device comprising:
- a spatial light modulator (SLM) arranged to output light;
- a display polariser arranged on the output side of the SLM, wherein the display polariser is a linear polariser;
- an additional polariser arranged on the output side of the display polariser wherein the additional polariser is a linear polariser;
- a switchable liquid crystal retarder comprising a layer of liquid crystal material arranged between the display polariser and the additional polariser, wherein the switchable liquid crystal retarder is a polar control retarder that is arranged, in a switchable state of the switchable liquid crystal retarder, simultaneously to introduce no net relative phase shift to orthogonal polarisation components of light passed by the display polariser along an axis along a normal to the plane of the switchable liquid crystal retarder and introducing a relative phase shift to orthogonal polarisation components of light passed by the display polariser along an axis inclined to a normal to the plane of the switchable liquid crystal retarder;
- switchable retarder control electrodes arranged to apply a voltage for controlling the state of the switchable liquid crystal retarder;
- at least one passive retarder arranged between the display polariser and the additional polariser;
- and
- a pair of touch electrode arrays arranged in layers separated by at least one dielectric layer that is not a retarder, the pair of touch electrode arrays and the at least one dielectric layer being arranged between the switchable retarder control electrodes and the additional polariser.
5 more elements
Dependencies are inferred from the claim text.