3m Innovative Properties Company

Kai Chang Lu

Ernesto M Rodriguez, Jr

Patricia M Hughes

William Edward Haushalter

Steven G Saxe

Ernesto M Rodriguez

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&#xb0;, 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.

Projection display device for multimedia and wall display systems

A front projection display device having a projection module and a docking station. The docking station has a base. Further, the docking station can include an extendable arm attached to the base. The projection module contains an optical engine. The optical engine includes an illumination system, an imaging system, and a wide-angle projection lens. The optical engine outputs an image at a half field angle of at least 45&#xb0;. The projected image has substantially no distortion and requires substantially no keystone correction.

Projection display device with a projection module

A portable projection device comprises a housing, a handle, and an optical engine. The optical engine comprises an illumination source, an imaging system, and a wide angle projection lens that includes a first lens group of negative refractive power, the first lens group having at least one aspheric surface, a second lens group, and a third lens group of positive refractive power. For the wide angle projection lens, the following Conditions (1) to (4) are satisfied: |F/F|&#x2267;4.5 (Condition (1)); 2.5&#x2266;|F/F|&#x2266;6.0 (Condition (2)); 3.8&#x2266;|F/F|&#x2266;5.0 (Condition (3)); and 0.8&#x2266;BFL/F&#x2266;1.4 (Condition (4)). The portable projection device can be implemented as a personal gaming system and can also be configured as a portable, fully integrated video gaming system that allows gamers to plug in and play at nearly any location, with only a wall or other viewing surface being used to view the projected image.

Projection lens and portable display device for gaming and other applications

A wide angle projection lens includes, in sequential order from an image side, a first lens group of negative refractive power, the first lens group having at least one aspheric surface, a second lens group, and a third lens group of positive refractive power. For the wide angle projection lens, the following Conditions (1) to (4) are satisfied: |F/F|&#x2267;4.5 (Condition (1)); 2.5&#x2266;|F/F|&#x2266;6.0 (Condition (2)); 3.8&#x2266;|F/F|&#x2266;5.0 (Condition (3)); and 0.8&#x2266;BFL/F&#x2266;1.4 (Condition (4)). An optical engine, including the wide angle projection lens, can be implemented in a projection display device.

Projection lens and display device for multimedia and other systems

A wide-angle projection lens includes a first lens group of negative refractive power, the first lens group having at least one aspheric surface. The projection lens also includes a second lens group of substantially zero refractive power and a third lens group of positive refractive power. The projection lens satisfies the following three conditions: |F/F|&#x3c;4.0 (Condition (1)), |F/F|&#x3e;50 (Condition (2)) and |F/F|&#x3c;3.5 (Condition (3)). In these conditions, F is the focal length of the wide-angle projection lens; Fis the focal length of the first lens group; Fis the focal length of the second lens group; and Fis the focal length of the third lens group. The wide-angle projection lens is used in a front projection display device.

Wide-angle projection lens for front projection display systems

A wide angle projection lens include a first lens group of negative refractive power that has at least one aspheric surface. The wide angle projection lens can output an image at a half field angle of at least 45&#xb0;, where the image has substantially no distortion and requires little or no keystone correction. The wide angle projection lens can be part of an optical engine that can be implemented in rear projection or front projection display devices.

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Birmingham, United Kingdom

Kai Chang Lu