Implementation of multi-touch gestures using a resistive touch display

• US 8,416,215 B2
• Filed: 02/03/2011
• Issued: 04/09/2013
• Est. Priority Date: 02/07/2010
• Status: Expired due to Fees

• Current Assignee: Itay Sherman
• Original Assignee: Itay Sherman
• Inventors: Sherman, Itay
• Primary Examiner(s): ABDULSELAM, ABBAS I
• Application Number:
  US13/020,026
• Publication Number:
  US 20110193819A1
• Time in Patent Office: 796 Days
• Field of Search: 345/173, 345/174, 178/18.01, 178/18.03, 178/18.05, 178/18.06, 178/18.07, 200/511, 200/512, 338/114, 338/115, 430/312, 430/313, 438/384
• US Class Current: 345/174
• 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 2203/04808 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 3/0416 Control or interface arrangements specially adapted for digitisers
• CPC Class Codes: G06F 3/045 using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact
• CPC Class Codes: G06F 3/04883 for inputting data by handwriting, e.g. gesture or text

Abstract

A system based on a standard resistive touch screen that is capable of detecting double point or finger taps or gestures, and districting them from single point or finger taps or gestures. The system uses either a standard analog touch controller capable of four measurement types or a modified analog touch controller capable of six or more measurement types, and the fixed known resistance ratio of the touch film layers, to calculate an approximation of the location of up to two separate touch points on the screen. A collection of the location samples is used to detect different single and double finger gestures.

Claims

1. A system for detection of single and double stylus and finger taps and gestures, comprising:

a resistive touch screen, comprising;

a dual layer of conducting film;

an isolation layer between the two conducting films; and

two electrodes on each film sheet sides;

an analog touch controller capable of;

applying voltage gap between two electrodes attached to one film and measuring the sensed voltage on both of the electrodes on the other sheet; and

applying voltage gap between two electrodes when one is attached to one film and the other to the second, and measuring the sensed voltage on the other two electrodes; and

a touch analysis controller operating as standalone device or embedded in a system controller,

wherein said touch analysis controller collects at least six different measurements from said analog touch controller and uses them to determine if the touch screen is touched on a single or multiple points, and to estimate the location of a single or double touch points.

2. The system of claim 1 wherein touch said analysis controller uses measurements of DX, DY and D or Ry′

to determine if the touch screen is touched on a single or multiple points and to estimate the location of a single or double touch points.

3. The system of claim 2 wherein said touch analysis controller determines, based on the magnitude of the measurements of DX, DY, whether to approximate the gap between touch points (dX and dY) based on a calculation using DX and DY, or based on a calculation using D or DR.

4. The system of claim 1 wherein only a single finger touch is required to calibrate the touch display and derive the Ry value.

5. The system of claim 1 wherein consecutive samples of approximated touch points are used to detect single and double finger gestures.

6. The system of claim 1 wherein the controller samples X, Y, X′

, Y′ and

based on their results determines which Z measurement pairs to execute and/or use for the dual touch point calculations.

7. A system for detection of single and double stylus and finger taps and gestures, comprising:

a resistive touch screen, comprising;

a dual layer of conducting film;

an isolation layer between the two conducting films; and

two electrodes on each film sheet sides;

an analog touch controller capable of

applying voltage gap between two electrodes attached to one film and measuring the sensed voltage on an electrode on the other sheet; and

applying voltage gap between two electrodes when one is attached to one film and the other to the second, and measuring the sensed voltage on the other two electrodes; and

a touch analysis controller operating as standalone device or embedded in a system controller,

wherein said touch analysis controller collects all four measurements from said analog touch controller (X, Y, Z1, Z2) and uses them to determine if the touch screen is touched at a single point or at multiple points.

8. The system of claim 7 wherein said touch analysis controller uses a value D or DR as described in this application as a distinction between single and double or more finger touch.

9. The system of claim 7 wherein said touch analysis controller uses the value D or DR as a distinction between single and double finger touch, and the sign of D or DR to distinguish between horizontal and vertical separation of the two fingers.

10. The system of claim 7 wherein said gestures include one of the following:

double finger tap, double finger swipe up, down, left or right and double finger pinch in or out on the horizontal or vertical direction.