Anamorphic lens for providing wide-screen images generated by a spatial light modulator
AssigneeTexas Instruments Incorporated
InventorDuane S. Dewald
Life of this patent
Estimating the term…
Abstract
An anamorphic lens (11) for use in a display system (10) that has a spatial light modulator (12) and a projection lens (13) and that projects images to a screen (14). The anamorphic lens (11) is placed between the projection lens (13) and the screen (14). The spatial light modulator (12) generates an image that is anamorphically squeezed in the horizontal dimension, and the anamorphic lens (11) widens the image so that the viewer perceives a normal wide-screen image on the screen (14).
Claims9
An anamorphic lens for use in a display system having a spatial light modulator for generating images and a projection lens for projecting the image to a screen, said spatial light modulator having an associated aspect ratio, and said screen and said projection lens having an optical path between them, comprising:
- a series of lens elements in an optical path between the screen and the projection lens, said series being:
- a first lens element that is a bi-concave lens;
- a second lens element spaced from said first lens element and having a first surface that is convex;
- a third lens element having a first surface that is convex, wherein said second lens and said third lens form a doublet;
- a fourth lens element spaced from said third lens element, thereby forming an air space, and having a first surface that is planar;
- and
- a fifth lens element having a first surface that is concave, wherein said fourth lens and said fifth lens form a doublet.
A method of displaying a wide-screen image with a display system having a spatial light modulator for generating the image and a projection lens for projecting the image to a screen, said spatial light modulator having an associated aspect ratio, and said screen and said projection lens having an optical path between them, comprising:
- providing a series of lens elements in an optical path between the screen and the projection lens, said series being:
- a first lens element that is a bi-concave lens;
- a second lens element spaced from said first lens element and having a first surface that is convex;
- a third lens element having a first surface that is convex, wherein said second lens and said third lens form a meniscus;
- a fourth lens spaced from said third lens element, thereby forming an air space, and having a first surface that is planar;
- and
- a fifth lens having a first surface that is concave, wherein said fourth lens and said fifth lens form a meniscus;
- and
- adjusting said air space between said third lens and said fourth lens.
Dependencies are inferred from the claim text.