×

Input apparatus and display system

  • US 8,890,835 B2
  • Filed: 02/08/2011
  • Issued: 11/18/2014
  • Est. Priority Date: 02/24/2010
  • Status: Active Grant
First Claim
Patent Images

1. An input apparatus comprising:

  • a touch sensor including a transparent substrate with which an object is brought into contact, and a rectangular single sheet electrode formed on the transparent substrate from a transparent conductive film, to detect a contact point of the contacting object;

    first detection means which inputs a measurement signal to the rectangular single sheet electrode from one of two opposing perimeter portions along a first direction, and takes out the measurement signal propagated through the rectangular single sheet electrode from another one of the two opposing perimeter portions, to detect the contact point along the first direction; and

    second detection means which, after the contact point in the first direction is detected, inputs a measurement signal to the rectangular single sheet electrode from one of two opposing perimeter portions along a second direction intersecting the first direction, and takes out the measurement signal propagated through the rectangular single sheet electrode from another one of the two opposing perimeter portions, to detect the contact point along the second direction,wherein the measurement signal comprises an alternating current signal containing a frequency band in which contact between the rectangular single sheet electrode and the contacting object changes the alternating current signal, andwherein the input apparatus further comprises a correction circuit configured to correct the alternating current signal so as to contain a frequency at a peak value of a differential frequency characteristic, which is a difference between frequency characteristics of the rectangular single sheet electrode observed when the object is not in contact with the touch sensor and the frequency characteristics of the rectangular single sheet electrode observed when the object is in contact with the touch sensor, at a maximum value.

View all claims
  • 8 Assignments
Timeline View
Assignment View
    ×
    ×