Method of detecting a position indicated by an electronic pen in a display-integrated panel for multilevel image display

摘要

In a display-integrated panel having first and second electrodes crossing each other and being operable to display a gray scale image, a position indicated by an electronic pen is detected by a method including the step of displaying information on a display panel by repeating a step of displaying one frame. This step of displaying one frame includes the step of applying to the second electrodes second direction drive signals of predetermined waveforms in accordance with a predetermined order at timings shifted from each other, applying to the first electrodes first direction drive signals of waveforms corresponding to display intensities of pixels, respectively, thereby performing gray scale image display on each pixel, and simultaneously detecting the position of the electronic pen in the first direction based on a waveform of an induced voltage induced at the electronic pen by the second electrode located near the electronic pen; and the step of applying a voltage for position detection to the first electrodes in accordance with the predetermined second order, and detecting a position of the electronic pen in the second direction based on an induced voltage induced at the electronic pen by the voltage for the position detection.