Touch panel with adaptive noise reduction
December 27, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesSignature authentication system Tablet input device Monophonic touch sensitive keyboard Touch activated controller and method Digital envelope generator Touch panel system and method Display device having unpatterned touch detection Touch-sensitive overlay Touch panel Digitizing method and apparatus for compensating cursor of stylus velocity errors InventorAssigneeApplicationNo. 455892 filed on 12/27/1989US Classes:345/173, Touch panel341/22Including keyboard or keypadExaminersPrimary: Brier, JefferyAssistant: Hjerpe, Richard Attorney, Agent or FirmInternational ClassG09G 005/00AbstractA touch panel has panel scanning signals selectively applied to the four sides of a touch sensing surface of the panel so as to establish alternating current voltage gradients in desired directions across the touch sensing surface. When the panel is touched, touch signals result and are utilized by a touch location circuit in determining the location of touch. The impedance touch current resulting from a user's touch may also be determined and used. The touch panel circuit automatically filters the touch signals to an extent which varies depending upon the rate of movement of touch from one location on the touch sensing surface to a subsequent location. Filtering is decreased with the increasing rates of movement. The touch panel thereby minimizes the effects of noise on touch location determination.Other References
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