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US 6,473,236 B2Granted
Projection lens and system
AssigneeDuke University
InventorsBiljana Tadic-Galeb, Robert E. Fischer
Life of this patent
Estimating the term…
Abstract
Projection lenses and projection lens systems are telecentric between an illumination subsystem and a set of imagers. The lenses and systems can exhibit color fringing correction, uniform imager illumination, athermalization, and component articulation for improved imaging. The lenses and systems may be employed in display apparatuses, such as folded display apparatuses that have decreased footprint size, but long effective projection lengths.
Claims26
A projection system, comprising:
- a projection lens comprising:
- a front lens unit;
- a back lens unit optically coupled to the front lens unit;
- and
- a linear reflecting polarizer optically coupled to the back lens unit and the front lens unit;
- an imager optically coupled to the linear reflecting polarizer and the back lens unit, wherein the back lens unit and the linear reflecting polarizer are adapted to provide substantially telecentric light to the imager;
- folded optics adapted to receive image light from the imager through the projection lens;
- and
- a display screen adapted to receive the image light from the folded optics for displaying an image, wherein the display screen comprises a beaded screen.
6 more elements
A projection system, comprising:
- a projection lens comprising:
- a front lens unit;
- a back lens unit optically coupled to the front lens unit;
- and
- a linear reflecting polarizer optically coupled to the back lens unit and the front lens unit;
- an imager optically coupled to the linear reflecting polarizer and the back lens unit, wherein the back lens unit and the linear reflecting polarizer are adapted to provide substantially telecentric light to the imager;
- folded optics adapted to receive image light from the imager through the projection lens;
- and
- a diffusive screen adapted to receive the image light from the folded optics for displaying an image.
6 more elements
A computer monitor, comprising:
- a projection lens comprising:
- a front lens unit;
- a back lens unit optically coupled to the front lens unit;
- and
- a linear reflecting polarizer optically coupled to the back lens unit and the front lens unit;
- an imager optically coupled to the linear reflecting polarizer and the back lens unit, wherein the back lens unit and the linear reflecting polarizer are adapted to provide substantially telecentric light to the imager;
- folded optics adapted to receive image light from the imager through the projection lens;
- and
- a display screen adapted to receive the image light from the folded optics for displaying an image, wherein the display screen comprises a beaded screen.
6 more elements
A television, comprising:
- a projection lens comprising:
- a front lens unit;
- a back lens unit optically coupled to the front lens unit;
- and
- a linear reflecting polarizer optically coupled to the back lens unit and the front lens unit;
- an imager optically coupled to the linear polarizer and the back lens unit, wherein the back lens unit and the linear reflecting polarizer are adapted to provide substantially telecentric light to the imager;
- folded optics adapted to receive image light from the image through the projection lens;
- and
- a display screen adapted to receive the image light from the folded optics for displaying an image, wherein the display screen comprises a beaded screen.
6 more elements
A holographic display system, comprising:
- a projection lens comprising:
- a front lens unit;
- a back lens unit optically coupled to the front lens unit;
- and
- a linear reflecting polarizer optically coupled to the back lens unit and the front lens unit;
- an imager optically coupled to the linear polarizer and the back lens unit, wherein the back lens unit and the linear reflecting polarizer are adapted to provide substantially telecentric light to the imager;
- folded optics adapted to receive image light from the imager through the projection lens;
- and
- a display screen adapted to receive the image light from the folded optics for displaying an image, wherein the display screen comprises a beaded screen.
6 more elements
A computer monitor, comprising:
- a projection lens comprising:
- a front lens unit;
- a back lens unit optically coupled to the front lens unit;
- and
- a linear reflecting polarizer optically coupled to the back lens unit and the front lens unit;
- an imager optically coupled to the linear reflecting polarizer and the back lens unit, wherein the back lens unit and the linear reflecting polarizer are adapted to provide substantially telecentric light to the imager;
- folded optics adapted to receive image light from the imager through the projection lens;
- and
- a display screen adapted to receive the image light from the folded optics for displaying an image, wherein the display screen comprises a diffusive screen.
6 more elements
A television, comprising:
- a projection lens comprising:
- a front lens unit;
- a back lens unit optically coupled to the front lens unit;
- and
- a linear reflecting polarizer optically coupled to the back lens unit and the front lens unit;
- an imager optically coupled to the linear polarizer and the back lens unit, wherein the back lens unit and the linear reflecting polarizer are adapted to provide substantially telecentric light to the imager;
- folded optics adapted to receive image light from the imager through the projection lens;
- and
- a display screen adapted to receive the image light from the folded optics for displaying an image, wherein the display screen comprises a diffusive screen.
6 more elements
A holographic display system, comprising:
- a projection lens comprising:
- a front lens unit;
- a back lens unit optically coupled to the front lens unit;
- and
- a linear reflecting polarizer optically coupled to the back lens unit and the front lens unit;
- an imager optically coupled to the linear polarizer and the back lens unit, wherein the back lens unit and the linear reflecting polarizer are adapted to provide substantially telecentric light to the imager;
- folded optics adapted to receive image light from the imager through the projection lens;
- and
- a display screen adapted to receive the image light from the folded optics for displaying an image, wherein the display screen comprises a diffusive screen.
6 more elements
Dependencies are inferred from the claim text.