Projection display system with pressure sensing at screen, and computer assisted alignment implemented by applying pressure at displayed calibration marks

• US 20040263488A1
• Filed: 04/27/2004
• Published: 12/30/2004
• Est. Priority Date: 10/21/1991
• Status: Active Grant

• Current Assignee: David A. Martin
• Original Assignee: David A. Martin
• Inventors: Martin, David A.
• Granted Patent: US 7,289,113 B2
• Time in Patent Office: Days
• US Class Current: 345/173
• CPC Class Codes: G03B 21/132 Overhead projectors, i.e. capable of projecting hand-writing or drawing during action epidiascopic projectors G03B21/08
• CPC Class Codes: G06F 3/033 Pointing devices displaced or positioned by the user , e.g. mice, trackballs, pens or joysticks; Accessories therefor digitisers characterised by the transducing means G06F3/041
• CPC Class Codes: G06F 3/0418 for error correction or compensation, e.g. based on parallax, calibration or alignment
• CPC Class Codes: G06F 3/0488 using a touch-screen or digitiser, e.g. input of commands through traced gestures
• CPC Class Codes: H04L 12/1813 for computer conferences, e.g. chat rooms instant messaging H04L51/04; protocols for multimedia communication H04L65/1101; arrangements for multi-party communication H04L65/403; telephonic conference arrangements H04M3/56; television conference systems H04N7/15
• CPC Class Codes: H04L 12/1822 Conducting the conference, e.g. admission, detection, selection or grouping of participants, correlating users to one or more conference sessions, prioritising transmission
• CPC Class Codes: H04L 12/1831 Tracking arrangements for later retrieval, e.g. recording contents, participants activities or behavior, network status

Abstract

An interactive display system comprising a touch sensitive display surface for sensing pressure applied thereto and in response generating control signals indicating locations of the applied pressure, a personal computer for receiving the control signals and in response generating graph images, and an LCD panel in combination with an overhead projector for receiving and projecting the graphic images onto the touch sensitive display surface at the indicated locations. The LCD panel and overhead projector may be provided an an integral unit.

Claims

1. An interactive display system, comprising:

a) one or more touch-sensitive display surfaces for detecting predetermined events associated therewith and in response generating control signals for identifying said events and indicating locations thereof,

b) one or more computers for selectively executing one or more application programs and in response generating screen video displays, said one or more computers being connected to respective ones of said touch-sensitive display surfaces,

c) driver means in each said one or more computers for receiving said control signals from an associated one of said touch-sensitive display surfaces and in response generating a command to a selected one of said applications programs for identifying an associated one or said computers and for identifying said events and indicating the locations, thereof, whereby said selected applications program executes said command and updates said screen video displays in accordance therewith, and

d) projector means connected to said one or more computers for receiving and projecting said screen video displays onto said one or more touch-sensitive display surfaces.

2-15. -15. (Cancelled)