Sharp Kabushiki Kaisha Corporation

Robert George Brown

Gillian Margaret Davis

Nicholas Mayhew

Duncan James Anderson

Kathryn Walsh

Michael Geraint Robinson

Haruhisa Takiguchi

Craig Tombling

Michael G Robinson

Stephen Peter Najda

Jason Kempton Slack

Masayuki Nakazawa

Anderson James Duncan

A broadband cholesteric optical device such as a polarizer or a spectral filter includes a broadband cholesteric layer, for instance, of a graded pitch type such that the cholesteric pitch increases monotonically from one surface of the film to the other surface. In order to improve the off-axis performance, a compensator is provided in the form of a positive birefringence film whose optic axis is substantially perpendicular to the film. Another negative birefringence film whose optic axis is also perpendicular to the film may also be provided.

Broadband cholesteric optical device having a broadband cholesteric layer, a positive C-plate and a negative C-plate

A dark field projection display includes a light source, a spatial light modulator, and an optical system for directing light from the light source onto the spatial light modulator. The optical system includes a plurality of optical subsystems and a plurality of reflectors. Each of the optical subsystems has an input aperture and is arranged to image light from the light source, the subsystems forming a spatial distribution of source images whose relative positions are different from the relative positions of the input apertures. Each of the optical subsystems further includes a plurality of reflectors disposed at the relative positions of the source images. Each of the reflectors is arranged to reflect light from a respective one of the subsystems onto the spatial light modulator.

Dark field projection display

A broadband cholesteric polariser includes at least one pair of adjacent layers. The at least one pair includes a cholesteric layer and a compensating layer. The compensating layer has a refractive index perpendicular to the compensating layer greater than a refractive index oriented within the compensating layer.

Broadband cholesteric polarizer and an optical device employing the same

An eye detection system comprises a source, such as an infrared laser diodes for emitting a divergent beam of infrared radiation. A spatial light modulator is controlled so as to act as a deflector for scanning the beam. A detector detects radiation which is retro-reflected by the eye back along the path of the scanning beam. The deflection angle of the SLM and, for a position sensitive detector, the location of the center of illumination on the detector can be used to determine the angle to the center of the pupil of the eye. By subsequently detecting the angle to the glints corresponding to other sources and, the gaze position of the eye on a screen can be determined.

Eye detection system for providing eye gaze tracking

A color semiconductor display device in which optoelectronic elements capable of emitting/absorbing light of different predetermined wavelengths in the visible wavelength range (e.g. red, green, blue) are formed on a common substrate and comprise similar alloy compositions which are lattice matched to the substrate material. The alloy is preferably a III-V nitride alloy lattice matched to Si or GaP substrate material. In the disclosed embodiment, a color display device comprises a silicon or GaP substrate with an array of pixels, each being formed by a group of three (red, green, blue) color sub-pixels provided on the substrate. The pixels are formed of InAINSb alloy, with a quantum well regions of InNSb and barrier regions of AINSb, or are formed of AIGaAsSbN alloy, with quantum well regions of GaAsN and barrier regions of AINSb. Tuning of the wavelength emission/absorption characteristics of the sub-pixels is by doping of the quantum well material with aluminum and/or by quantum confinement.

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Thame, United Kingdom

Robert George Brown