Contact detecting device and display device using display scan signal for contact detection

• US 9,965,082 B2
• Filed: 08/28/2015
• Issued: 05/08/2018
• Est. Priority Date: 09/16/2008
• Status: Active Grant

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display Incorporated
• Inventors: Noguchi, Koji, Takeuchi, Takeya
• Primary Examiner(s): FISCHER, MARK L
• Application Number:
  US14/839,519
• Publication Number:
  US 20150370408A1
• Time in Patent Office: 984 Days
• CPC Class Codes: G06F 1/16 Constructional details or arrangements
• CPC Class Codes: G06F 3/041 Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0416 Control or interface arrangements specially adapted for digitisers
• CPC Class Codes: G06F 3/04166 Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184
• CPC Class Codes: G06F 3/044 by capacitive means
• CPC Class Codes: G06F 3/0445 using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
• CPC Class Codes: G06F 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes

Abstract

A contact detecting device including: 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.

Claims

1. A touch detecting device comprising:

a touch panel including a first region and a second region that is adjacent to the first region in a first direction;

a plurality of first detecting lines arranged in the first region;

a plurality of second detecting lines arranged in the second region;

a plurality of driving lines arranged to intersect the first detecting lines in the first region and the second detecting lines in the second region, wherein a region boundary between the first region and the second region is along the driving lines in a plan view;

a scan driving circuit configured to supply a scan driving signal to the driving lines, the scan driving signal being a signal that is also used for display driving of a display of the touch detecting device in generating image information for the display; and

a detecting section to detect a touch, based on a signal detected from the first detecting lines and/or the second detecting lines,

wherein the scan driving circuit, upon starting the display driving that includes writing for the display in the first region, performs a plurality of contact driving scans of the first and second regions in parallel by simultaneously supplying the scan driving signal that is an alternating voltage pulse signal having a predetermined frequency to the corresponding driving lines in the first region and the second region in parallel, without performing any display driving for the display in the second region.

2. The touch detecting device set forth in claim 1,

wherein the first region and the second region are in parallel with each other.

3. The touch detecting device set forth in claim 1,

wherein the first detecting lines are disposed completely separated from the second detecting lines in the first direction.