×

Display based optical communication system

  • US 6,118,490 A
  • Filed: 05/01/1997
  • Issued: 09/12/2000
  • Est. Priority Date: 05/01/1997
  • Status: Expired due to Fees
First Claim
Patent Images

1. A communication system for transmitting information by digital binary signaling over an optical channel, said system comprising:

  • an optical transmitter provided by a selected portion of a visual display in a display device which can provide light at selected intensities to thereby provide sequences of light pulses in said optical channel such that durations of said light pulses therein represent binary logic states in accord with digital data provided to said optical transmitter from a data source to thereby form a binary pulse duration modulated optical signal in said optical channel, said light pulses in said sequences of said optical signal each having a minimum duration after such pulse begins;

    a photodetector positioned across from said selected portion of said visual display to receive said optical signal from said optical channel and provide at an output thereof corresponding electrical signals serving as photodetector output signals; and

    a signal processor having an input electrically connected to said photodetector output to receive said photodetector output signals, said signal processor being capable of determining substantially when individual ones of said light pulses began and ended relative to neighboring said light pulses in said sequences thereof.

View all claims
  • 3 Assignments
Timeline View
Assignment View
    ×
    ×