Methods and apparatus for transferring data from a display screen
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United States of America Patent
Stats
-
Aug 28, 2001
Grant Date -
N/A
app pub date -
Jul 12, 1999
filing date -
Jul 12, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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