Contact detecting device and display device having regions to be driven

• US 8,854,329 B2
• Filed: 01/29/2013
• Issued: 10/07/2014
• Est. Priority Date: 09/16/2008
• Status: Active Grant

• Current Assignee: Japan Display West Incorporated (Japan Display Incorporated)
• Original Assignee: Japan Display Incorporated
• Inventors: Noguchi, Koji, Takeuchi, Takeya
• Primary Examiner(s): Young, Wayne
• Assistant Examiner(s): FISCHER, MARK L
• Application Number:
  US13/753,270
• Publication Number:
  US 20130141377A1
• Time in Patent Office: 616 Days
• Field of Search: None
• US Class Current: 345/173
• 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

Disclosed herein is 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 contact detecting device comprising:

a contact responding section configured to produce an electric signal change in response to an object to be detected coming into contact with or proximity to a detecting surface, said contact responding section includes a plurality of regions extending in a second direction in parallel with each other;

a contact driving scanning section configured to scan application of a driving voltage to said contact responding section in a first direction within said detecting surface to control output of said electric signal change in time series, said contact driving scanning section applies said driving voltage to a group of a predetermined number of consecutive regions among said plurality of regions, said predetermined number of consecutive regions are electrically coupled to each other in common upon being applied with said driving voltage;

a plurality of detecting lines extending in said first direction in parallel with each other;

a detecting section configured to detect occurrence of said electric signal change from a voltage change in said plurality of detecting lines, and identify a position of the occurrence;

said detecting section is connected to each one end in said first direction of said detecting lines and identifies one of said plurality of regions with which said object to be detected is in contact or to which said object to be detected is in proximity on the basis of the voltage change of each detecting line;

said group includes N (≧

2) regions,

a predetermined number of N sets of detecting lines among said plurality of detecting lines are arranged in such a manner that a number of detecting lines included in said N sets and overlapping any of said N regions being different between said N regions, and

said contact driving scanning section supplies driving voltages of the same amplitude to said N regions.