| 摘要 |
A system and method compensates for drift in electronic touch screens. A plurality of touch areas and drift areas are defined for a touch screen. From location coordinates generated by the screen, a ratio between detected touch hits in each defined touch area and detected touch hits in each corresponding drift area is computed. The computed ratio is compared to a calibration threshold to determine whether the number of touch hits in the drift area are excessive. If they are, a correction vector for all or a portion of the screen may be computed and used to adjust subsequent location coordinates or a calibration signal may be generated. The calibration signal may be a data message transmitted to a remote site to indicate a service call is required at the site of the touch screen and computer. Preferably, the system includes a location adjustor that determines whether the adjustment vectors for a plurality of keypad areas have a corresponding direction and magnitude. If they do, the location adjustor adjusts the definition of the touch and drift areas in the keypad memory.
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