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US 6,535,182 B2Granted
Head-mounted projection display system
AssigneeKoninklijke Philips Electronics N.V.
InventorDouglas A. Stanton
Life of this patent
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Abstract
A head-mounted projection display system is characterized by a pair of head-mounted low-power image projectors mounted adjacent the eyes of the viewer, and aimed to project in a direction along the line of sight of the viewer toward a high-gain, retro-reflective screen. Stereoscopic viewing is enabled by projecting separate images to the right and left projectors. The retro-reflectivity of the screen ensures that the right and left images will be returned to the right and left eye, respectively.
Claims3
A stereoscopic projection display method, comprising:
- projecting a first image in the line-of-sight of a viewer from a first projector including an electro-optical light modulator and a projection lens at a first location adjacent to a first one of viewer's eyes, onto a retroreflective projection display screen;
- projecting a second image in the line-of-sight of the viewer from a second location adjacent to a second one of viewer's eyes, onto the retroreflective projection display screen;
- and
- making the line-of-sight directions of projecting the first and second images dependent on the position of the viewer's head, such that said directions change with the line-of-sight of the viewer as the viewer's head moves,
- such that:
- the electro-optical light modulator and the projection lens are disposed on a headset to be worn by the viewer during said projecting of the first and second images;
- the position of the retroreflective projection display screen is independent of the position of the viewer's head;
- the first image and the second image comprise differing perspective views, so that the viewer experiences a stereoscopic image effect;
- the first image is reflected from the retroreflective projection display screen to the first one of viewer's eyes but not to the second one of viewer's eyes;
- and
- the second image is reflected from the retroreflective projection display screen to the second one of viewer's eyes but not to the first one of viewer's eyes.
8 more elements
Dependencies are inferred from the claim text.