Computer graphics processing and selective visual display system – Display peripheral interface input device – Touch panel
Reexamination Certificate
2011-01-11
2011-01-11
Osorio, Ricardo L (Department: 2629)
Computer graphics processing and selective visual display system
Display peripheral interface input device
Touch panel
C345S173000
Reexamination Certificate
active
07868877
ABSTRACT:
A touch panel detection circuit includes current limiting circuitry that has a first portion coupled between a first supply voltage terminal and a first input node and a second portion coupled between a second input node and a second supply voltage terminal. Programmable precharge circuitry connects the first input node to the first supply voltage terminal via a conductive path that is in parallel with the first portion of the current limiting circuitry and precharges the first input node to a predetermined voltage. Comparison circuitry is coupled to the programmable precharge circuitry and to the first input node. The comparison circuitry detects a change in resistance between the first input node and the second input node and provides a signal in response thereto when the comparison circuitry is enabled by the programmable precharge circuitry.
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PCT/US2008/076390 International Search Report and Written Opinion.
Lin Sheng
Olmos Alfredo
Pietri Stefano
Tipple David R.
Chiu Joanna G.
Freescale Semiconductor Inc.
King Robert L.
Osorio Ricardo L
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