System and method for transmitting data from a computer to a portable information device using RF emissions from a computer monitor
US5801664A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 12, 1996 |
| Grant date | Sep 1, 1998 |
| Priority date | — |
| Expiry date | Feb 12, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/14
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A data transmission system includes a programmable portable information device, a frame-scanning graphics display device (e.g., a CRT monitor), and a display device controller (e.g., a personal computer). The display device controller supplies pixel data to the frame-scanning graphics display device which causes the display device to depict a particular changing optical pattern. To display the particular pattern, the frame-scanning graphics display device inherently fluctuates in energy output as different pixel intensities require different degrees of power. As a result, the frame-scanning graphics display device effectively emits an RF carrier signal. The programmable portable information device is equipped with an RF receiver that can receive the RF signal from the display device when the programmable portable information device is within a transmission range. The RF carrier signal is modulated to carry programming data to the portable information device. The portable information device demodulates the RF signal to obtain the digital data stream.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.