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US 6,886,941 B2Granted
Compact light engine with light guides for projection display system
AssigneeKoninklijke Philips Electronics N.V.
InventorPeter J. Janssen
Life of this patent
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Abstract
A light engine for a single panel scrolling color projection display system employs a light guide to guide light from a source through unequal path lengths to an output lens. The light guide is characterized by little or no light loss or increase in etendue (angular extent) regardless of path length, resulting in a compact arrangement having high performance and low cost.
Claims14
A light engine for a projection display system comprising:
- a beam splitter for splitting light from a source into two or more light components;
- a light guide comprising:
- at least a source branch for guiding light from the source to the beam splitter;
- and
- at least first and second component branches for guiding the light components away from the beam splitter;
- each of the source branch and the first and second component branches consisting of at least one straight light guide section of rectangular cross-section and at least one light coupling element.
3 more elements
A projection display system comprising:
- a light engine for a projection display system comprising:
- a beam splitter for splitting light from a source into two or more light components;
- a light guide comprising:
- at least a source branch for guiding light from the source to the beam splitter;
- and
- at least first and second component branches for guiding the light components away from the beam splitter;
- each of the source branch and the first and second component branches consisting of at least one straight light guide section of rectangular cross-section and at least one light coupling element;
- at least one light modulator panel for modulating light in accordance with a display signal;
- and
- a projection lens for projecting the modulated light onto a display screen.
7 more elements
Dependencies are inferred from the claim text.