Padmaraja L Yedamale from 2340 E Binner Dr, Chandler, AZ 85225, age 51

Padmaraja Yedamale Phones & Addresses

Touch Sense Using Time Domain Reflectometry
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US Patent:

20110267287, Nov 3, 2011
Filed:

Oct 27, 2010
Appl. No.:

12/912964
Inventors:

James S. Bartling - Chandler AZ, US
Padmaraja Yedamale - Chandler AZ, US
Jerry Hanauer - Germantown WI, US
International Classification:

G06F 3/041
US Classification:

345173
Abstract:

A touch panel or screen has a serpentine transmission line fabricated on a substrate, e.g., printed circuit board, LCD, plasma or LED screen, etc., and has a constant impedance. A touch to the touch panel will cause a change of impedance of the transmission line at the location of the touch. Time domain reflectometry (TDR) is used for determining the location of the change of impedance of the transmission line by accurately measuring the return pulse time at the source of the initial pulse, and then converting the return pulse time to X-Y coordinates of the touch panel or screen.

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