Display apparatus

• US 20050052428A1
• Filed: 07/09/2004
• Published: 03/10/2005
• Est. Priority Date: 07/10/2003
• Status: Abandoned Application

• Current Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Original Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Inventors: Sugimura, Toshiaki, Hayashi, Kouki, Hiraiwa, Akira, Manabe, Hiroyuki, Hiraiwa, Yumiko
• Application Number:
  US10/886,631
• Publication Number:
  US 20050052428A1
• Time in Patent Office: Days
• US Class Current: 345/173
• CPC Class Codes: G06F 3/0488 using a touch-screen or digitiser, e.g. input of commands through traced gestures

Abstract

A display apparatus comprises a display, a transparent conductive film having a plurality of stimulation electrodes, an insensitive electrode electrically isolated from the stimulation electrodes and maintained at a constant potential, and a voltage applying device for establishing a potential difference between each stimulant electrode and the insensitive electrode. When the transparent conductive film is given a touch, the voltage applying device causes a state in which the potential of the stimulation electrodes is higher than that of the insensitive electrode, plural times intermittently or once in a predetermined period immediately after the touch, and varies the potential of the stimulation electrodes with time so as to intermittently cause a state in which the potential of the insensitive electrode is higher than that of the stimulation electrodes, in a predetermined pulse width and at a predetermined frequency during a continuing period of the touch thereafter.

Claims

1. A display apparatus comprising:

a display;

a transparent electrode layer overlaid on a screen of the display and having a plurality of transparent electrodes arranged in a two-dimensional array on the opposite side to a surface facing the screen;

an insensitive electrode electrically isolated from the transparent electrodes and maintained at a constant potential; and

voltage applying means for varying a potential of the transparent electrodes to establish a potential difference between each said transparent electrode and the insensitive electrode;

wherein in response to a touch on the transparent electrode layer, the voltage applying means varies the potential of a transparent electrode in a region of the transparent electrode layer given the touch, with time.

2. The display apparatus according to claim 1, wherein when the transparent electrode layer is given the touch, the voltage applying means varies with time the potential of a transparent electrode in a region of the transparent electrode layer given the touch so as to cause a first state in which the potential of the transparent electrode is higher than that of the insensitive electrode, in the predetermined time immediately after the touch and to cause a second state in which the potential of the insensitive electrode is higher than that of the transparent electrode, during a continuing period of the touch thereafter.

3. The display apparatus according to claim 2, wherein the potential of the transparent electrode is set higher at least once in a predetermined pulse width and at a predetermined frequency.

4. The display apparatus according to claim 2, wherein the potential of the transparent electrode is set lower intermittently in a predetermined pulse width and at a predetermined frequency.

5. The display apparatus according to claim 1, comprising touch pressure detecting means for, when the transparent electrode layer is given a touch, detecting a pressure of the touch,

wherein when the transparent electrode layer is given the touch, the voltage applying means varies with time the potential of the transparent electrode in a region of the transparent electrode layer given the touch so as to intermittently cause the second state in which the potential of the insensitive electrode is higher than that of the transparent electrode in the predetermined pulse width and at the predetermined frequency during the continuing period of the touch and so that the frequency is varied as needed, based on the pressure of the touch detected by the touch pressure detecting means.

6. The display apparatus according to claim 1, wherein the voltage applying means further sets the potential of the transparent electrode higher than that of the insensitive electrode in a predetermined time before an end of the touch.

7. The touch panel display apparatus according to claim 1, wherein the voltage applying means varies with time the potential of a transparent electrode in a predetermined area, out of the transparent electrodes in the region of the transparent electrode layer given the touch, and

wherein the predetermined area is set corresponding to an image displayed on the display.