Display apparatus
AssigneeGEC-Marconi Limited
InventorsJohn M. Bagshaw, Donald C. Bowles
Life of this patent
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Abstract
A cathode ray tube is used to address a spatial light modulator. The light used to read the spatial light modulator is preferably passed through an acoustic optical tunable filter to enable the wavelength and intensity to be rapidly controlled to provide, for example, a multicolor display of variable intensity. This finds particular application in head-up displays for use by pilots of aircrafts.
Claims16
A display apparatus comprising a spatial light modulator having a photosensitive input surface and an output surface, the input surface being arranged to vary the light reflectance characteristics of the output surface according to an image formed on the input surface, a cathode ray tube having a phosphor screen, the phosphor screen being coupled to the input surface of the spatial light modulator, whereby successive frames of an image formed by the cathode ray tube onto said screen are each reproduced as a reflectance pattern at the output surface;
- and a light source operable to irradiate the output surface with light of a variable wavelength and/or variable intensity each selected cyclically in synchronism with and in accordance with each frame of the image formed by the cathode ray tube.
Dependencies are inferred from the claim text.