Patent · US Expired

Projection display system

US6331848A · kind A · utility

110Cited by

9References

7Claims

0Family size

Assignee

U.S. Philips Corporation · US

Inventors

Andrew G. Stove · Reigate, GB
Ruediger Grewer · Hamburg, DE
Ingwer-Curt Carlsen · Hamburg, DE
Heino Svensson · Hamburg, DE
Karl-Juergan Moennich · Wedel, DE
Joachim Schmidt · Schlangen, DE
Thomas Wendler · Hamburg, DE

Key dates

Filing date	Apr 24, 1997
Grant date	Dec 18, 2001
Priority date	—
Expiry date	Apr 24, 2017

Classification

Technology area (CPC H)Electricity
CPC primaryH04N9/3185
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

A projection display system comprises a presentation computer (1) which generates images which are projected onto a screen (4) using a projector (3) controlled over a line (2) by the computer (1). A video camera (5) views the screen and a laser pointer (8) is supplied for pointing at the screen (4). An interaction computer (7) analyses the signal produced by the video camera (5) to determine the position of peak value in a frame to locate the point at which the laser pointer (5) is pointed. The laser pointer (6) is provided with buttons (10) which perform conventional computer mouse button functions. The state of the buttons (10) may be signalled to the computer (7) over an infra red link (9).

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.