| 摘要 |
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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