Methods and apparatus for transferring data from a display screen
AssigneePointSet Corporation
InventorKyle Fields
Life of this patent
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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.
Claims12
A method of transferring data from a display screen to a receiving device comprising the steps of:
- modulating intensity of at least a portion of the display screen to represent a data digit having a numerical base greater than two with a corresponding one of a plurality of intensity levels greater than two, wherein said one intensity level is maintained for a dwell having a duration unrelated to the data digit;
- and
- sensing the modulated intensity level in the receiving device.
A method of transferring data from a display screen to a receiving device comprising the steps of:
- modulating color of at least a portion of the display screen to represent a data digit having a numerical base greater than two with a corresponding one of a plurality of colors greater than two, wherein said one color is maintained for a dwell having a duration unrelated to the data digit;
- and
- sensing the modulated color in the receiving device.
A method of transferring data from a display screen to a receiving device comprising the steps of:
- displaying a graphic pattern on the display screen, said graphic pattern comprising a first number of white pixels and a second number of black pixels, the first number of white pixels to the second number of black pixels being a predetermined ratio selected from a set of predetermined ratios, said set having more than two members so that the selected ratio represents a corresponding data digit having a numerical base greater than two, wherein said graphic pattern is maintained for a dwell having a duration unrelated to the data digit;
- and
- sensing the ratio of white pixels to black pixels in the receiving device.
A method of transferring data from a display screen to a receiving device comprising the steps of:
- modulating intensity of at least two colors on the display screen;
- modulating a phase relationship between the modulated colors to represent a data digit having a numerical base greater than two with a corresponding one of a plurality of phase relationships greater than two, wherein said one phase relationship is maintained for a dwell having a duration unrelated to the data digit;
- and
- sensing the modulated phase relationship in the receiving device.
Dependencies are inferred from the claim text.