Rear projection system with passive display screen

摘要

Described herein are systems and techniques for projecting content, periodically or continuously, onto a rear surface of a display medium from behind. The rear projected image is presented on an opposing or front surface of the display medium to a human audience for viewing. Additionally, non-visible light (e.g., IR light) is passed through the display medium to an area in front of the medium. The non-visible light is used to detect human gestures. In this manner, the rear projection arrangement avoids viewer obstruction during projection, yet detects and recognizes gestures made by the viewer in front of the display medium.

主权项

1. A system comprising:
a device comprising:
a processor;a projector; anda light emitter configured to emit non-visible light; a display medium that is physically separate from the device, the display medium configured to:
receive images projected onto a rear surface of the display medium by the projector, causing the images to be displayed for viewing on a front surface of the display medium at a first brightness level, andallow non-visible light directed to the rear surface of the display medium to pass, at least in part, through the display medium to an environment in front of the front surface of the display medium; and the device further comprising one or more computer-readable media storing computer-executable instructions that, when executed by the processor, cause the processor to perform acts comprising:
determining that the image has decreased from the first brightness level to a second brightness level that is less than the first brightness level;based at least partly on the image decreasing from the first brightness level to the second brightness level, causing an additional instance of the image to be projected onto the rear surface of the display medium;detecting, based at least in part on an interaction of a user of the display medium with the non-visible light passed through to the environment, one or more gestures made by the user;determining one or more operations to be performed based on the one or more gestures; andperforming at least one operation of the one or more operations.