Optical coupler for projection display
Assignee3M Innovative Properties Company
InventorsRoy Auerbach, Gunnar Hans Gunnarsson
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Abstract
An optical element is disclosed that includes a face plate of a cathode ray tube and a lens element facing the face plate. The optical element further includes an optical coupling material disposed between the lens element and the face plate. The optical coupling material includes particles dispersed in a host material.
Claims38
An optical element comprising:
- a face plate of a cathode ray tube having an average index of refraction n1 over the visible range;
- a lens element facing the face plate having an average index of refraction n3 over the visible range;
- and
- an optical coupling material disposed between the lens element and the face plate for optically coupling the face plate to the lens element, the optical coupling material having an index of refraction n2 over the visible range, the optical coupling material comprising nano-particles dispersed in a fluid host material, the nano-particles having an average index of refraction na over the visible range, and the host material having an average index of refraction nb over the visible range.
A projection display system comprising:
- a CRT image source for forming an image, the CRT having a face plate;
- a lens element for projecting the image formed by the source, the lens element facing the face plate;
- and
- an optical coupling material disposed between the lens element and the face plate for optically coupling the face plate to the lens element, the optical coupling material comprising nano-particles dispersed in a fluid host material.
The projection display system of 32, further comprising a viewing screen for displaying the image projected by the lens element.
The projection display system of 32 comprising three CRT image sources.
The projection display system of 32 being a front projection display system.
The projection display system of 32 being a rear projection display system.
A cathode ray tube projection system comprising:
- a face plate of a cathode ray tube and a lens element arranged in spaced-apart opposing positions defining a coupler cavity;
- and
- a coupling fluid dispersed within the coupler cavity, the coupling fluid including nano-particles.
Dependencies are inferred from the claim text.