Abstract: The disclosure provides a display system and a method for displaying a virtual image to a viewer An optical system of the disclosure includes a spatial light modulator, a light source, a Fourier transform lens, a viewing system and a processing system. The spatial light modulator is arranged to display holographic data in the Fourier domain, illuminated by the light source. The Fourier transform lens is arranged to produce a 2D holographic reconstruction in the spatial domain corresponding to the holographic data. The viewing system is arranged to produce a virtual image of the 2D holographic reconstruction. The processing system is arranged to combine the Fourier domain data representative of a 2D image with Fourier domain data representative of a phase only lens to produce first holographic data, and provide the first holographic data to the optical system to produce a virtual image.

Abstract: A head-up display for a windscreen having spatially variant optical power. The head-up display includes a diffuser arranged to display an image. The diffuser is shaped to compensate for the spatially variant optical power of the windscreen. A holographic projector may be provided, which is arranged to project the image for display onto the diffuser and includes a spatial light modulator arranged to apply a phase-delay distribution to incident light. The phase-delay distribution includes phase-only data representative of an object. The projector further includes Fourier transform means arranged to perform a Fourier transform of phase modulated light received from the spatial light modulator and to form the image on the diffuser.

Abstract: An imaging device includes a projection optic arranged to form a virtual image of an object. The imaging device further includes a first diffuser positioned a first distance from the virtual projection optic and a second diffuser positioned a second distance from the virtual projection optic. The controller is arranged to control the first and second diffuser to make the real image visible on one of the diffusers.

Abstract: A method of processing a pixellated image to retrieve a phase distribution representative of the image. The phase distribution representative of the image is in the Fourier domain. The method includes padding the image pixels with padding, or non-image, pixels to increase the total number of pixels in the pixellated image. The method further includes processing the padding or non-image pixels differently to the image pixels in each iteration of the iterative method.

Abstract: An iterative method of retrieving phase information in the Fourier domain representative of the nth frame of a sequence of 2D image frames. The method comprises using at least one parameter related to retrieval of phase information Fourier domain of the (n?1) frame as a starting point for the iterative method.

Abstract: There is provided a method of projection using an optical element (502,602) having spatially variant optical power. The method comprises combining Fourier domain data representative of a 2D image with Fourier domain data having a first lensing effect (604a) to produce first holographic data. Light is spatially modulated (504,603a) with the first holographic data to form a first spatially modulated light beam. The first spatially modulated light beam is redirected using the optical element (502,602) by illuminating a first region (607) of the optical element (602) with the first spatially modulated beam. The first lensing effect (604a) compensates for the optical power of the optical element in the first region (607). Advantageous embodiments relate to a head-up display for a vehicle using the vehicle windscreen (502,602) as an optical element to redirect light to the viewer (505,609).

Abstract: A display system (300) comprising an optical system and a processing system. The optical system comprising a spatial light modulator (380), a light source, a Fourier transform lens, a viewing system (320, 330) and a processing system. The spatial light modulator is arranged to display holographic data in the Fourier domain, illuminated by the light source. The Fourier transform lens is arranged to produce a 2D holographic reconstruction in the spatial domain (310) corresponding to the holographic data. The viewing system is arranged to produce a virtual image (350) of the 2D holographic reconstruction. The processing system is arranged to combine the Fourier domain data representative of a 2D image with Fourier domain data representative of a phase only lens to produce first holographic data, and provide the first holographic data to the optical system to produce a virtual image.

Abstract: A method of processing a pixellated image to retrieve a phase distribution representative of the image. The phase distribution representative of the image is in the Fourier domain. The method includes padding the image pixels with padding, or non-image, pixels to increase the total number of pixels in the pixellated image. The method further includes processing the padding or non-image pixels differently to the image pixels in each iteration of the iterative method.

Abstract: A near-eye device includes a spatial light modulator and a beam combiner. The spatial light modulator includes an array of phase modulating elements arranged to apply a phase delay distribution to incident light. The beam combiner includes a first optical input arranged to receive spatially modulated light from the spatial light modulator and a second optical input having a field of view of the real world.

Abstract: An iterative method of retrieving phase information in the Fourier domain representative of the nth frame of a sequence of 2D image frames. The method comprises using at least one parameter related to retrieval of phase information Fourier domain of the (n?1) frame as a starting point for the iterative method.

Abstract: A display system (300) comprising an optical system and a processing system. The optical system comprising a spatial light modulator (380), a light source, a Fourier transform lens, a viewing system (320, 330) and a processing system. The spatial light modulator is arranged to display holographic data in the Fourier domain, illuminated by the light source. The Fourier transform lens is arranged to produce a 2D holographic reconstruction in the spatial domain (310) corresponding to the holographic data. The viewing system is arranged to produce a virtual image (350) of the 2D holographic reconstruction. The processing system is arranged to combine the Fourier domain data representative of a 2D image with Fourier domain data representative of a phase only lens to produce first holographic data, and provide the first holographic data to the optical system to produce a virtual image.