Patent
Optical stack for switchable directional display
Jonathan Harrold,Michael G. Robinson,Graham John Woodgate +2 more
- 16 Jul 2019
11
TL;DR: In this article, the authors proposed a privacy display consisting of a spatial light modulator and a compensated switchable guest-host liquid crystal retarder arranged between first and second polarisers arranged in series with the spatial modulator, which reduced the visibility of the display to off-axis snoopers by means of luminance reduction over a wide polar field.
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Abstract: A privacy display comprises a spatial light modulator and a compensated switchable guest-host liquid crystal retarder arranged between first and second polarisers arranged in series with the spatial light modulator. In a privacy mode of operation, 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 means of luminance reduction over a wide polar field. In a wide angle mode of operation, the switchable liquid crystal retardance is adjusted so that off-axis luminance is substantially unmodified.
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Citations
Patent
Optical stack for privacy display
Michael G. Robinson,Graham John Woodgate,Robert A. Ramsey,Jonathan Harrold +3 more
- 18 Jul 2018
TL;DR: In this paper, a switchable privacy display consisting of a polarised output spatial light modulator, and an additional polariser is proposed to provide high contrast images for display users while maintaining high visual security level for off-axis snoopers.
14
Patent
Reflective optical stack for privacy display
Michael G. Robinson,Graham John Woodgate,Jonathan Harrold,Robert A. Ramsey +3 more
- 18 Jul 2018
TL;DR: In this paper, the visibility of the display to off-axis snoopers is reduced by means of luminance reduction and increased frontal reflectivity to ambient light, while display reflectivity is reduced for on-axis reflections of ambient light.
9
Patent
Optical waveguide for directional backlight
Graham John Woodgate,Michael G. Robinson +1 more
- 26 Sep 2019
TL;DR: In this article, a switchable directional backlight for a privacy display comprises a waveguide with first and second opposing input ends and a turning film arranged to collect light output from the waveguide for input into a spatial light modulator.
7
Patent
Touch screen for privacy display
Jonathan Harrold,Graham John Woodgate +1 more
- 24 Jan 2019
TL;DR: In this article, a display consisting of a polarised output spatial light modulator, switchable liquid crystal retarder, absorbing polariser and touch panel electrodes is used for data addressing.
7
Patent
Display device with uniform off-axis luminance reduction
Michael G. Robinson,Graham John Woodgate +1 more
- 20 May 2021
TL;DR: In this paper, a display device comprising a spatial light modulator having a display polariser arranged on one side of the spatial modulator is provided with an additional polariser with two surface alignment layers disposed adjacent to a layer of liquid crystal material on opposite sides.
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Patent
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