Angled color dispersement and recombination prism
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United States of America Patent
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-
Nov 3, 1998
Grant Date -
N/A
app pub date -
Sep 26, 1996
filing date -
Sep 26, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An image projection arrangement is provided. The arrangement includes a light source assembly for producing a first light beam. A reflective image display system is arranged in the path of the first light beam and has at least one cell for generating an image to be projected. A projection lens system is arranged in the path of a second light beam originating from the image display system for projecting the image produced by the image display system onto a projection screen. Between the light source assembly and the image display system on the one hand, and between this system and the projection lens system on the other hand, a transition from a first to a second medium is provided. This transition occurs at an interface having a normal direction. The first and second media have different refractive indices. The transition is arranged such that one of the first and second light beams is totally reflected by the transition while the other light beam is transmitted by the transition. Between the light source assembly and the image display system on the one hand, and between this system and the projection lens system on the other hand, an angle is formed, the bisector of this angle defining an optic axis of the system. The bisector of the angle is not parallel to the interface normal.
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