The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 04, 2011
Filed:
Jun. 29, 2007
Ernesto M. Rodriguez, Jr., Austin, TX (US);
Patricia M. Hughes, Round Rock, TX (US);
William E. Haushalter, Spicewood, TX (US);
Kai Chang LU, Sutton Coldfield, GB;
Ernesto M. Rodriguez, Jr., Austin, TX (US);
Patricia M. Hughes, Round Rock, TX (US);
William E. Haushalter, Spicewood, TX (US);
Kai Chang Lu, Sutton Coldfield, GB;
3M Innovative Properties Company, St. Paul, MN (US);
Abstract
A front projection display device includes an optical engine including an illumination system, an imaging system, and projection optics. The projection optics include a first lens group of negative refractive power that has at least one aspheric surface. The projection optics output an image at a half field angle of at least 45°, where the image has substantially no distortion. For example, when the first lens group is placed at a distance of less than 1 meter from a viewing screen, the output image has a size of about 40 inches diagonal or greater, and requires substantially no keystone correction. In other aspects, the optical engine can be implemented in a wall-mounted projection system, a multimedia system, a compact integrated monitor system, and a portable projection unit.