Contact detecting device and display device for multi-touch sensing

摘要

According to one aspect of the invention, a contact detecting device includes: a contact responding section configured to produce an electric change in response to an object to be detected coming into contact with or proximity to a detecting surface; and a contact driving scanning section configured to scan application of driving voltage to the contact responding section in one direction within the detecting surface, and control output of the electric change in time series, wherein the contact driving scanning section performs a plurality of scans of different regions of the contact responding section in parallel with each other, and outputs a plurality of the electric changes in parallel with each other.

主权项

1. A contact detecting device comprising:
a contact responding section configured to produce an electric change in response to an object to be detected coming into contact with or proximity to a detecting surface; a plurality of first detecting lines arranged for a first region of said contact responding section to output said electric change in the first region; a plurality of first driving lines arranged to intersect the first detecting lines in the first region; a plurality of second detecting lines arranged for a second region of said contact responding section to output said electric change in the second region, the second region being different from the first region; a plurality of second driving lines arranged to intersect the second detecting lines in the second region; a contact driving scanning section shared with the first region and the second region, and configured to supply a scan driving voltage to the first region and the second region of the contact responding section via the plurality of first driving lines and the plurality of second driving lines, and control output of the electric change in time series; and two detecting sections respectively disposed on both ends of the contact responding section in the longitudinal direction of the first and second detecting lines, each of the detecting sections being configured to detect occurrence of the electric change from a voltage change in the corresponding detecting lines, and identify a position of the occurrence, wherein the plurality of regions are in parallel with each other in a direction of the driving lines, the contact driving scanning section performs a plurality of scans of the first and second regions of the contact responding section in parallel with each other by identically supplying the scan driving voltage as a common driving signal that is an alternating-current pulse signal having a predetermined frequency to the first and second driving lines in parallel, so that the first and second driving lines of the contact detecting device are sequentially scanned simultaneously, and output a plurality of electric changes in parallel to the corresponding detecting sections, respectively.