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Input device

  • US 6,091,405 A
  • Filed: 08/08/1994
  • Issued: 07/18/2000
  • Est. Priority Date: 06/30/1992
  • Status: Expired due to Fees
First Claim
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1. An input device for a visual display screen, the device comprising a first assembly including:

  • a source of diverging light comprising rays directed substantially parallel to the surface of the screen, said rays substantially covering the screena shutter disposed to interrupt a portion of said light before it reaches the screen, said shutter comprising an array of shutter elements, each element having a unique address, further wherein each element has a transparent state in which light from said light source is transmitted and an opaque state in which light from said light source is blocked;

    shutter drive circuit means coupled to said shutter elements for controlling the state of each of said shutter elements so as to provide a scanning light beam as an output of said shutter; and

    a photodetector for detecting interruption of said light beam by an article positioned in the plane and for providing a first output signal upon detecting said interruption of said light beam.

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