Projection type image display apparatus
AssigneeFuji Photo Optical Co., Ltd.
InventorChikara Yamamoto
Life of this patent
Estimating the term…
Abstract
A projection type display apparatus decomposes white light emitted from a light source into color light components, combines the color light components after image modulation, and projects a desirable image onto a screen by using a projection lens. A lens element constituting a part of the projection lens is disposed upstream a color light combining device for combining the color light components.
Claims20
A projection type display apparatus chromatically decomposing white light emitted from a light source into color light components, chromatically combining said color light components after image modulation, and projecting a desirable image onto a screen by using a projection lens;
- said apparatus comprising:
- color light decomposing means for decomposing said white light into a first color light component in three color light components and the remaining second and third color light components, and emitting thus obtained color light components into respective directions different from each other;
- a first optical device for guiding said first color light component emitted from said color light decomposing means to a first reflection type light valve for optically modulating said first color light component and emitting said first color light component optically modulated by said first reflection type light valve;
- a second optical device consisting of a polarization separating/combining device for separating said second and third color light components emitted from said color light decomposing means into said second and third color light components, guiding said two color light components to second and third light valves for optically modulating the respective color light components, combining said second and third color light components optically modulated by said light valves, and emitting thus combined color light components;
- and
- color light combining means for combining said first color light component emitted from said first optical device and said second and third color light components emitted from said second optical device;
- wherein a first lens comprising at least one lens element is disposed between said first optical device and said color light combining means;
- and
- wherein a second lens comprising at least one lens element is disposed between said second optical device and said color light combining means.
A projection type display apparatus comprising:
- three-color light combining means for combining a first color light component of three primary color light components with the remaining second and third color light components, said first and said remaining second and third color light components being incident on said three-color light combining means in two directions different from each other after being optically modulated by respective reflection type light valves corresponding to said three primary color light components;
- two-color light combining means for combining said second and third color light components;
- a first lens disposed between said three-color light combining means and said reflection type light valve for optically modulating said first color light component, said first lens comprising at least one lens element;
- a second lens disposed between said two-color light combining means and said three-color light combining means, said second lens comprising at least one lens element;
- and
- a third lens disposed on a light exit side of said three-color light combining means;
- said first and third lenses constituting a projection lens;
- said second and third lenses constituting a projection lens.
Dependencies are inferred from the claim text.