Methods and apparatus for transferring data from a display screen
US6281820A · kind A · utility
34Cited by
51References
13Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 12, 1999 |
| Grant date | Aug 28, 2001 |
| Priority date | — |
| Expiry date | Jul 12, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/32
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Luminance or color modulation of a display screen is used to transfer data to an external receiving device. At least a portion of the display screen is modulated, such as by intensity modulation, to represent a data digit. By using a plurality of intensity levels greater than 2, it is possible to represent data digits having a numerical base greater than 2. For example, providing modulation with ten different intensity levels allows each modulation "dwell" to represent a decimal digit. The modulation is sensed by a photodetector in the external receiving device and converted to the corresponding data digit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.