Invention Grant
- Patent Title: Projection display device for multimedia and wall display systems
- Patent Title (中): 多媒体和墙壁显示系统的投影显示设备
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Application No.: US11771003Application Date: 2007-06-29
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Publication No.: US07864435B2Publication Date: 2011-01-04
- Inventor: Ernesto M. Rodriguez, Jr. , Patricia M. Hughes , William E. Haushalter , Kai Chang Lu
- Applicant: Ernesto M. Rodriguez, Jr. , Patricia M. Hughes , William E. Haushalter , Kai Chang Lu
- Applicant Address: US MN St. Paul
- Assignee: 3M Innovative Properties Company
- Current Assignee: 3M Innovative Properties Company
- Current Assignee Address: US MN St. Paul
- Main IPC: G02B3/00
- IPC: G02B3/00 ; G02B9/00 ; G02B13/04 ; G02B13/18 ; G02B3/02

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.
Public/Granted literature
- US20070285624A1 PROJECTION DISPLAY DEVICE FOR MULTIMEDIA AND WALL DISPLAY SYSTEMS Public/Granted day:2007-12-13
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