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US 6,883,922 B2Granted
Display apparatus
AssigneeCanon Kabushiki Kaisha
InventorsKatsumi Kurematsu, Toshihiro Sunaga
Life of this patent
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Abstract
It is an object of this invention to provide a high-quality, high-precision, large-screen display apparatus which can obtain a sufficient light beam reception angle with respect to an image display unit, improve imaging performance, and obtain a thin structure. There is provided a display apparatus for obliquely projecting light from an image display unit onto a projection optical system, wherein the projection optical system includes a plurality of aspherical curved mirrors and projects an image without distortion (1.2% or less).
Claims3
A display apparatus comprising:
- at least one image display means:
- a projection surface;
- and
- a projection optical system for obliquely projecting image light from said at least one image display means onto said projection surface,
- wherein said projection optical system includes at least six aspherical curved mirrors and a plurality of plane mirrors which are sequentially arranged from the image display means side, and
- wherein said projection optical system projects the image light with a distortion equal to or less than 0.5% and a brightness unevenness on the projection surface by the image light is equal to or less than 20%.
3 more elements
Dependencies are inferred from the claim text.