Electronic device, control method, and integrated circuit

• US 9,857,898 B2
• Filed: 02/02/2015
• Issued: 01/02/2018
• Est. Priority Date: 02/28/2014
• Status: Active Grant

• Current Assignee: FCNT LLC
• Original Assignee: Fujitsu Limited
• Inventors: Takahashi, Yuji
• Primary Examiner(s): Sternbane, Larry
• Assistant Examiner(s): BRITTINGHAM, NATHANIEL P
• Application Number:
  US14/612,008
• Publication Number:
  US 20150248187A1
• Time in Patent Office: 1,065 Days
• Field of Search: None
• CPC Class Codes: G06F 2203/04101 2.5D-digitiser, i.e. digitiser detecting the X/Y position of the input means, finger or stylus, also when it does not touch, but is proximate to the digitiser's interaction surface and also measures the distance of the input means within a short range in the Z direction, possibly with a separate measurement setup
• CPC Class Codes: G06F 2203/04104 Multi-touch detection in digitiser, i.e. details about the simultaneous detection of a plurality of touching locations, e.g. multiple fingers or pen and finger
• CPC Class Codes: G06F 2203/04111 Cross over in capacitive digitiser, i.e. details of structures for connecting electrodes of the sensing pattern where the connections cross each other, e.g. bridge structures comprising an insulating layer, or vias through substrate
• CPC Class Codes: G06F 2203/04806 Zoom, i.e. interaction techniques or interactors for controlling the zooming operation
• CPC Class Codes: G06F 2203/04808 Several contacts: gestures triggering a specific function, e.g. scrolling, zooming, right-click, when the user establishes several contacts with the surface simultaneously; e.g. using several fingers or a combination of fingers and pen
• CPC Class Codes: G06F 3/017 Gesture based interaction, e.g. based on a set of recognized hand gestures interaction based on gestures traced on a digitiser G06F3/04883
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• 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
• CPC Class Codes: G06F 3/04847 Interaction techniques to control parameter settings, e.g. interaction with sliders or dials
• CPC Class Codes: G06F 3/04883 for inputting data by handwriting, e.g. gesture or text

Abstract

An electronic device includes a detector configured to detect a region touched on a touch panel, a memory, and a processor coupled to the memory, configured to approximate a first touched region detected by the detector at a first time and a second touched region detected by the detector at a second time to ellipses, calculate angles formed between the major axes of the approximated ellipses and a reference axis of the touch panel, and calculate reference points of the approximated ellipses, and control a predetermined process based on changes of the second angle and second reference point calculated from the second touched region with respect to the first angle and first reference point calculated from the first touched region.

Claims

1. An electronic device comprising:

a detector configured to detect a region touched on a touch panel;

a memory; and

a processor coupled to the memory, configured to;

approximate, to a first ellipse, a first touched region detected by the detector at a first time, the first ellipse is approximated based on first coordinates of first grids included in the first touched region;

approximate, to a second ellipse, a second touched region detected by the detector at a second time, the second ellipse is approximated based on second coordinates of second grids included in the second touched region,

calculate a first angle formed between a first major axis of the first ellipse and a reference axis of the touch panel;

calculate a first reference point of the first ellipse based on a first center of gravity of the first ellipse;

calculate a second angle formed between a second major axis of the second ellipse and the reference axis of the touch panel;

calculate a second reference point of the second ellipse based on a second center of gravity of the second ellipse;

determine an angle difference between the first angle and the second angle;

determine a location difference between the first reference point and the second reference point;

calculate an area of the second touched region;

determine a touch state of the touch panel based on the area; and

control to enlarge or reduce an image displayed on the touch panel based on the determined touch state, the angle difference, and the location difference, wherein a rate of the enlarging or reducing corresponds to the angle difference and the location difference.

4. The electronic device according to claim 1,

wherein the processor is configured to determine at least one of a first state in which a large region is touched, a second state in which a small region is touched, and an untouched state as the touch state of the touch panel.

5. The electronic device according to claim 4,

wherein the processor is configured to determine the first state when the area is larger than a first determination threshold, the second state when the area is equal to or smaller than the first determination threshold and larger than a second determination threshold, and the untouched state when the area is equal to or smaller than the second determination threshold.

6. The electronic device according to claim 4, wherein the processor is configured to determine to control to enlarge or reduce the image in response to determining that the touch state is the first touch state.

2. A control method comprising:

detecting a region touched on a touch panel;

approximating, to a first ellipse, a first touched region detected at a first time, the first ellipse is approximated based on first coordinates of first grids included in the first touched region;

approximating, to a second ellipse, a second touched region detected at a second time, the second ellipse is approximated based on second coordinates od second grids included in the second touched region;

calculating a first angle formed between a first major axis of the first ellipse and a reference axis of the touch panel;

calculating a first reference point of the first ellipse based on a first center of gravity of the first ellipse;

calculating a second angle formed between a second major axis of the second ellipse and the reference axis of the touch panel;

calculating a second reference point of the second ellipse based on a second center of gravity of the second ellipse;

determining an angle difference between the first angle and the second angle;

determining a location difference between the first reference point and the second reference point;

calculating an area of the second touched region;

determining a touch state of the touch panel based on the area; and

controlling to enlarge or reduce an image displayed on the touch panel based on the determined touch state, the angle difference, and the location difference, wherein a rate of the enlarging or reducing corresponds to the angle difference and the location difference.

3. An integrated circuit comprising:

a detector configured to detect a region touched on a touch panel;

a calculator configured to;

approximate, to a first ellipse, a first touched region detected by the detector at a first time, the first ellipse is approximated based on first coordinates of first grids included in the first touched region;

approximate, to a second ellipse, a second touched region detected by the detector at a second time, the second ellipse is approximated based on second coordinates of second grids included in the second touched region;

calculate a first angle formed between a first major axis of the first ellipse and a reference axis of the touch panel;

calculate a first reference point of the first ellipse based on a first center of gravity of the first ellipse;

calculate a second angle formed between a second major axis of the second ellipse and the reference axis of the touch panel;

calculate a second reference point of the second ellipse based on a second center of gravity of the second ellipse;

calculate an angle difference between the first angle and the second angle;

calculate an area of the second touched region; and

output the calculated results; and

a processor controller configured to;

determine a touch state of the touch panel based on the area; and

control to enlarge or reduce an image displayed on the touch panel based on the determined touch state, the angle difference, and the location difference, wherein a rate of the enlarging or reducing corresponds to the angle difference and the location difference.