Apparatus and method for displaying a video image
AssigneeCambridge Enterprise Limited
InventorsNeil Collings, Timothy Wilkinson, William Crossland, Edward Buckley, Adrian Cable, Nicholas Lawrence, Peter Mash
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Abstract
A method of displaying a video image comprises receiving sequential image frames at a processor. Each image frame is processed to obtain a kinoform. A programmable diffractive element such as an SLM represents the sequence of kinoforms allowing reproduction of the image using a suitable illumination beam.
Claims46
A method of projecting a 2-D video image onto a screen, the projected 2-D video image being made up of sequential image frames at a video frame rate, the method comprising:
- receiving an input video image made up of video frames at a processor;
- in the processor, processing each input video frame in real-time to obtain quantised data representative of one or more respective phase-only kinoforms;
- writing the quantised data representative of one or more respective phase-only kinoforms to a reflective pixellated LCOS phase-only spatial light modulator to sequentially represent each said kinoform;
- illuminating the reflective pixellated LCOS phase-only spatial light modulator with visible light from an illumination source to provide a phase modulated output beam;
- processing the phase modulated output beam from the reflective pixellated LCOS phase-only spatial light modulator by optics to reconstruct the sequential image frames across the screen at a replay field in real-time for viewing the 2-D video image, wherein the optics comprises a Fourier transform lens;
- and
- controlling the intensity of the illumination source to achieve a desired image brightness from frame to frame.
A projector for projecting a 2-D video image onto a screen, the projected 2-D video image being made up of sequential image frames at a video frame rate, the projector comprising:
- a processor, a reflective pixellated LCOS phase-only spatial light modulator and an illumination source for illuminating the reflective pixellated LCOS phase-only spatial light modulator with visible light, the processor having an input for receiving an input video image made up of video frames and an output for writing data to the reflective pixellated LCOS phase-only spatial light modulator, the processor being arranged to:
- process each image frame in real-time to obtain quantised data representative of one or more respective phase-only kinoforms;
- and
- write the quantised data representative of one or more respective phase-only kinoforms to the reflective pixellated LCOS phase-only spatial light modulator to sequentially represent each said kinoform;
- the illumination source arranged to illuminate the reflective pixellated LCOS phase-only spatial light modulator with visible light to provide a phase-modulated output beam, the projector further comprising optics to reconstruct the sequential image frames across the screen in real-time for viewing the 2-D video image, wherein the optics comprises a Fourier transform lens;
- and
- a controller arranged to control the intensity of the illumination source to achieve a desired image brightness from frame to frame.
Dependencies are inferred from the claim text.