System and method for transmitting data from a computer to a portable information device using RF emissions from a computer monitor
First Claim
1. A data transmission system, comprising:
- a programmable portable information device having an RF receiver;
a frame-scanning graphics display device to display a sequence of changing optical patterns;
a display device controller connected to cause the frame-scanning graphics display device to depict a particular changing optical pattern that produces energy fluctuation in the frame-scanning graphics display device, the energy fluctuation defining an RF signal representing a digital data stream that can be detected by the RF receiver when the programmable portable information device is within a transmission range; and
the portable information device receiving the RF signal to obtain the digital data stream.
2 Assignments
0 Petitions
Accused Products
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.
54 Citations
30 Claims
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1. A data transmission system, comprising:
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a programmable portable information device having an RF receiver; a frame-scanning graphics display device to display a sequence of changing optical patterns; a display device controller connected to cause the frame-scanning graphics display device to depict a particular changing optical pattern that produces energy fluctuation in the frame-scanning graphics display device, the energy fluctuation defining an RF signal representing a digital data stream that can be detected by the RF receiver when the programmable portable information device is within a transmission range; and the portable information device receiving the RF signal to obtain the digital data stream. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A data transmission system, comprising:
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a programmable portable information device having an RF receiver; a frame-scanning graphics display device to display a sequence of changing optical patterns; a display device controller connected to supply pixel data to the frame-scanning graphics display device to define the particular changing optical pattern, the pixel data causing the frame-scanning graphics display device to vary pixel intensities during depiction of the particular changing optical pattern to produce energy fluctuation in the frame-scanning graphics display device which emits an RF carrier signal at a selected frequency and modulated according to a digital data stream; and the portable information device receiving the modulated RF carrier signal when the programmable portable information device is within a transmission range, the portable information device further having a demodulator to demodulate the RF carrier signal to obtain the digital data stream. - View Dependent Claims (15, 16, 17)
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18. A computer system for transmitting data to a remote programmable portable information device, the computer system comprising:
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a frame-scanning graphics display device to display a sequence of changing optical patterns; and a display device controller connected to cause the frame-scanning graphics display device to depict a particular changing optical pattern that produces energy fluctuation in the frame-scanning graphics display device, the energy fluctuation defining an RF signal representing a digital data stream that can be detected by the programmable portable information device when the programmable portable information device is within a transmission range. - View Dependent Claims (19, 20, 21)
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22. A method for transmitting data from a computer monitor to a portable information device, the portable information device being equipped with an RF receiver, the method comprising the following steps:
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displaying a pattern on the computer monitor that produces energy fluctuation in the computer monitor, the energy fluctuation defining an RF signal representing a digital data stream; receiving the RF signal at the portable information device when the portable information device is within a transmission range; and extracting the digital data stream from the RF signal at the portable information device. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30)
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Specification