Display based optical communication system
US6118490A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 1, 1997 |
| Grant date | Sep 12, 2000 |
| Priority date | — |
| Expiry date | May 1, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N7/0255
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A communication system for transmitting information by digital binary signaling over an optical channel as a series of light pulses each beginning with a minimum duration and thereafter being variable to represent different binary states. Transmission is between an optical transmitter based on a portion of a display screen in a display device and a photodetector in a signal processing system. Information is recovered by finding averaged sample values, and is evaluated by comparing it against an accumulated averaged sample based threshold derived from the optical signal at a selected intensity. The information received can be used to verify user inputs to the signal processing system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.