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 modulated video signal;
a remote receiver configured to receive said modulated 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 modulated video signal to control and drive said video display device;
said modulated 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 portion of each said field time containing a burst of pixel luminance and control data.
2 Assignments
0 Petitions
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 shaped by a shaping lens. Designs for shaping lenses and collecting lens assemblies are described. Some embodiments include return audio transmission.
119 Citations
78 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 modulated video signal; a remote receiver configured to receive said modulated 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 modulated video signal to control and drive said video display device; said modulated 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 portion of each said field time containing a burst of pixel luminance and control data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. An apparatus including a video interface for a remote display, comprising:
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a video processing circuit configured to output a modulated video signal; a remote receiver;
said receiver configured to receive said modulated video signal;a remote electronic circuit interconnected between said receiver and a video display device, said remote electronic circuit configured to apply said modulated video signal to control and drive said video display device; and a shaping lens assembly located proximate to said receiver, said shaping lens assembly being configured to output said modulated video signal to said receiver at least in part through a free atmospheric path on a modulated beam of electromagnetic energy, such that said modulated beam of electromagnetic energy is concentrated substantially within a volume including the probable location of said receiver. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37, 38, 39, 40)
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41. An apparatus including a shaping lens assembly configured for shaping a beam of electromagnetic radiation, said assembly comprising:
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a convergent output lens having a hollow conic input surface and a substantially hemispherical output surface; and a divergent input lens having a hollow conic input surface and a flat output surface; said input lens and said output lens being aligned and adjustably separated along a mutual axis. - View Dependent Claims (42, 43)
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44. 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 attached coaxially to said inner light cone; and an outer conic cavity disposed coaxially around said wide-angle collecting lens, said outer conic cavity having polished reflective inner walls. - View Dependent Claims (45, 46, 47, 48)
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49. A method of operating a remote video display device, comprising:
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generating a modulated video signal; transmitting said modulated video signal to a remote receiver; and applying said modulated video signal to control and drive said video display device; said modulated 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 portion of each said field time containing a burst of pixel luminance and control data. - View Dependent Claims (50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67)
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68. A method of operating a remote video display device, comprising:
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generating a modulated video signal; transmitting said modulated video signal on a modulated beam of electromagnetic energy through a free atmospheric path to a remote receiver; and applying said modulated video signal to control and drive said video display device; and shaping said modulated beam of electromagnetic energy, thereby concentrating said modulated beam of electromagnetic energy within a volume including the probable location of said receiver. - View Dependent Claims (69, 70, 71, 72, 73, 74, 75, 76, 77, 78)
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Specification