By Lisa Johnston
New products on display at the American International Toy Fair, held in N
Haier recently unveiled at the International CES a prototype of a large-screen TV that does not require wired connections for power or source components.
Power for the demo set was delivered using a new wireless power transfer technology based on magnetic coupling. It was developed by WiTricity, a U.S.-based venture firm founded in April 2007 by a professor from the Massachusetts Institute of Technology.
The demo TV used a coil measuring 1 foot by by 1 foot on its back to receive up to 100 watts of electricity transmitted from a distance of up to 1 meter away. The distance of the power transmission was said to equate to three to five times the size of the diameter of the coil.
In the demonstration Haier transmitted electricity through a feeder system located 20 cm to 30 cm away from the back of the TV.
For signal sources, the wireless TV used connections using the Wireless Home Digital Interface (WHDI) standard, which is a high-speed communication system for wirelessly transmitting high-definition images in a home.
The WHDI standard, which is based on wireless technology developed by Amimon, has a 5GHz frequency band.
Using a bandwidth of 40MHz, the system can transmit A/V signals including uncompressed 1080p/60Hz video at a 3Gbps rate. The maximum transmission range is 100 feet, and supports transmissions through walls.
The WHDI standard group announced WHDI 1.0 as an official standard in December 2009.
Haier said it has not yet determined when it will begin commercial production of the technology.
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