Computer graphics processing and selective visual display system – Display peripheral interface input device – Touch panel
Reexamination Certificate
2011-03-29
2011-03-29
Awad, Amr (Department: 2629)
Computer graphics processing and selective visual display system
Display peripheral interface input device
Touch panel
C178S018010, C178S018050
Reexamination Certificate
active
07916127
ABSTRACT:
A touch screen digitizing system includes a first resistive screen and a touch screen controller including an ADC and self-test circuitry having a driver switch coupled between a reference voltage and a first terminal of the first resistive screen, and a first test switch coupled between ground and a conductor connected to generate a first test voltage on the conductor indicative of connection resistance between the first resistive screen and the touch screen controller. Another test switch couples the test voltage to an input of the ADC. An output of the ADC is compared with a reference to determine whether the connection resistance is excessive. Connection resistance between a second resistive screen and the touch screen controller is measured similarly. Similar self-test circuitry operates to detect a short circuit between the first resistive screen and the second resistive screen.
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Awad Amr
Brady III Wade J.
Bray Stephen A
Patti John J.
Telecky , Jr. Frederick J.
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