Light pen system for pixel-based displays
Filing Information
- Patent Number: US7421111
- Application Number: US10704098
- Filing date: 11/07/2003
- Issue date: 09/02/2008
- Prior Publication Data:
- US20050099405 - 05/12/2005
- Predicted expiration date: 01/09/2026
- Patent term adjustment: 794
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analyzing 100 million+ documents to uncover your network...- U.S. Classifications: 382/154 ·
- International Classifications: G06K900 ·
Abstract
An interactive display system includes a pixel-based display surface and a light pen. A sequence of patterns is projected onto the display surface. The sequence of patterns has a unique sequence of light intensities for each location of the display surface. Intensities of light at an arbitrary location are sensed by the light pen while projecting the sequence of patterns. The intensifies of light are decoded to determine coordinates of the arbitrary location.References Cited
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Foreign Patent Documents
| Document Number | Assignees | Inventors | Issue/Pub Date |
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Other Publications
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Referenced By
The current document is not referenced by other documents.Patent Family
| Document Number | Assignee | Inventors | Issue/Pub Date |
|---|---|---|---|
| US20050099405 | Paul Dietz et al. | May 2005 | |
| WO2005045655 | MITSUBISHI DENKI KABUSHIKI KAISHA | Paul H. DIETZ et al. | May 2005 |
| EP1680732 | MITSUBISHI DENKI KABUSHIKI KAISHA | Paul H. DIETZ et al. | Jul 2006 |
| CN1875337 | MITSUBISHI ELECTRIC CORP | CHUNG DIETZ PAUL H LEIGH DARRE | Dec 2006 |
| JP2007510966 | Apr 2007 | ||
| CN100388173 | MITSUBISHI ELECTRIC CORP | RAMESH RASKAR et al. | May 2008 |
| US7421111 | Mitsubishi Electric Research Laboratories, Inc. | Paul H. Dietz et al. | Sep 2008 |
Independent Claims | See all claims (17)
- 1. A method for determining coordinates of a location on a display surface, comprising: projecting a sequence of patterns onto the display surface using a projector, the sequence of patterns having a unique sequence of light intensities for each location of the display surface, and each unique sequence encoding coordinates of the corresponding location, and in which the sequence of patterns includes a header sequence of patterns; sensing the light intensities at an arbitrary location of the display surface using an optical sensor while projecting the sequence of patterns; determining a rate of the patterns from the header sequence of patterns; and decoding the sensed light intensities according to the rate of the patterns to determine coordinates of the arbitrary location on the display surface.
- 16. An interactive display system, comprising: a display surface; a projector configured to display a sequence of patterns onto the display surface, the sequence of patterns having a unique sequence of light intensities for each location of the display surface, and each unique sequence of light intensities encoding coordinates of the corresponding location, and in which the sequence of patterns includes a header sequence of patterns; an optical sensor configured to sense the light intensities at an arbitrary location on the display surface, while the projector displays the sequence of patterns; means for determining a rate of the patterns from the header sequence of patterns; and means for decoding the sensed light intensities according to the rate of the patterns to determine coordinates of the arbitrary location.
