Base capacitance compensation for a touchpad sensor

Details Base capacitance compensation for a touchpad sensor Base capacitance compensation for a touchpad sensor

2006-10-03

2011-10-18

Liang, Regina (Department: 2629)

Computer graphics processing and selective visual display system

Display peripheral interface input device

Touch panel

C345S174000, C178S018060

Reexamination Certificate

active

08040325

ABSTRACT:
Methods are provided for base capacitance compensation of traces in a touchpad sensor. Compensation areas are calculated by evaluating the differences between the base capacitances of the traces, or the differences between the base capacitances of the traces and a target value. The compensation areas are electrically connected to respective traces to equalize the base capacitances of the traces. Alternatively, a relationship between the areas of the traces and the distances from the traces to a grounding layer for equalizing the base capacitances of the traces is derived and from which the areas of the traces or the position of the grounding layer are adjusted.

REFERENCES:
patent: 5495077 (1996-02-01), Miller et al.
patent: 2004/0252109 (2004-12-01), Trent et al.

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