Infrared audio/video interface for head-mounted display
First Claim
1. An apparatus including a video interface for a remote display, comprising:
- a video processing circuit configured to output a baseband video signal, said video signal having a data structure comprising a repetitive sequence of frame times, each said frame time containing substantially equal consecutive field times for each of three color fields;
a transceiver module comprising a cluster of infrared light-emitting diodes coupled to said video processing circuit for transmitting said baseband video signal, and wherein the cluster includes a first group and a second group of light-emitting diodes that are arranged in an electronic dipole configuration such that the respective electromagnetic fields from the first and second groups cancel each other;
a remote receiver configured to receive said baseband video signal; and
a remote electronic circuit interconnected to said receiver and to a video display device, said remote electronic circuit configured to apply said baseband video signal to control and drive said video display device.
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Accused Products
Abstract
A video interface linking a base station with a remote display, e.g., a head-mounted display, converts input video signals from NTSC or PAL formats into modulated video signals containing repetitive sequences of frame times with embedded audio and control signals. Each frame time includes equal consecutive color field times. Frame rates are converted by inserting selected repeating color frames into the datastream. Bursts of image information occupy a portion of each field time. During each data burst, the display is loaded with pixel luminance data. Between bursts, the display is illuminated by a color LED. Two video displays can be driven alternately, i.e., the first display loads while the second is illuminated. The modulated video signal can travel through the atmosphere on an infrared (IR) beam with a wavelength between 700 nm and 1100 nm. In one embodiment, the beam is scattered from a diffuse reflecting surface. Alternatively, the beam is emitted from an array of infrared light emitting diodes (LEDs). Designs for collecting lens assemblies are described. Some embodiments include return audio transmission.
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Citations
52 Claims
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1. An apparatus including a video interface for a remote display, comprising:
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a video processing circuit configured to output a baseband video signal, said video signal having a data structure comprising a repetitive sequence of frame times, each said frame time containing substantially equal consecutive field times for each of three color fields;
a transceiver module comprising a cluster of infrared light-emitting diodes coupled to said video processing circuit for transmitting said baseband video signal, and wherein the cluster includes a first group and a second group of light-emitting diodes that are arranged in an electronic dipole configuration such that the respective electromagnetic fields from the first and second groups cancel each other;
a remote receiver configured to receive said baseband video signal; and
a remote electronic circuit interconnected to said receiver and to a video display device, said remote electronic circuit configured to apply said baseband video signal to control and drive said video display device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. An apparatus including a video interface for a remote display, comprising:
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a video processing circuit configured to output a baseband video signal;
a remote receiver, said receiver configured to receive said baseband video signal;
a remote electronic circuit interconnected between said receiver and a video display device, said remote electronic circuit configured to apply said baseband video signal to control and drive said video display device; and
a transceiver module comprising a cluster of infrared light-emitting diodes located proximate to said receiver, wherein the cluster includes a first group and a second group of light-emitting diodes, the first and second groups being arranged in an electronic dipole configuration such that the respective electromagnetic fields from the first and second groups cancel each other, said transceiver module being configured to output said baseband video signal to said receiver at least in part through a free atmospheric path. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
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38. An apparatus including a collecting lens assembly comprising:
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an inner light cone having diffusely reflecting outer walls;
a wide-angle collecting lens coupled coaxially to said inner light cone;
an outer conic cavity disposed coaxially around said wide-angle collecting lens, said outer conic cavity having polished reflective inner walls; and
a prismatic dispersion plate for widening a collecting angle of said assembly. - View Dependent Claims (39, 40, 41, 42)
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43. A method of operating a remote video display device, comprising:
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generating a baseband video signal;
transmitting said baseband video signal through a free atmospheric path to a remote receiver coupled to the remote video display device using a cluster of light-emitting diodes, and wherein the cluster includes a first group and a second group of light-emitting diodes that are arranged in an electronic dipole configuration such that the respective electromagnetic fields from the first and second groups cancel each other; and
applying said baseband video signal to control and drive said remote video display device. - View Dependent Claims (44, 45, 46, 47, 48, 49, 50, 51, 52)
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Specification