DATA PROCESSING SYSTEM COMPRISING A USER INTERFACE

摘要

A data processing system comprises a user interface with an image display panel with row and column electrodes. Drive means generate electric signals on the row and column electrodes in order to generate an image on the image display panel. The interface comprises a signal pick-up member which can be displaced relative to the image display panel in order to pick-up measurement signals in response to the electric signals for generating the image. The signal pick-up member is coupled to measuring means in order to derive a position of the signal pick-up member relative to the image display panel from the measurement signals. The measuring means are arranged to detect the measurement signals in synchronism with the generation of at least a sub-set of the electric signals. The electric signals for generating the image thus also serve to determine the position of the signal pick-up member.