Touch Panel with Multi-Touch Function and Method for Detecting Multi-Touch Thereof

• US 20100149122A1
• Filed: 11/23/2009
• Published: 06/17/2010
• Est. Priority Date: 12/12/2008
• Status: Abandoned Application

• Current Assignee: ASUSTek Computer, Inc.
• Original Assignee: ASUSTek Computer, Inc.
• Inventors: Lin, Hung-Yi
• Application Number:
  US12/623,628
• Publication Number:
  US 20100149122A1
• Time in Patent Office: Days
• US Class Current: 345/173
• 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 3/045 using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact

Abstract

A touch panel with a multi-touch function and a method for detecting a multi-touch thereof are provided. The touch panel includes transparent conductive substrate, a transparent conductive film, first conducting wires, second conducting wires and a main detecting module. The transparent conductive film is disposed on the transparent conductive substrate. The two first conducting wires and second conducting wires are disposed at four corresponding sides of the transparent conductive substrate, to provide a constant voltage. A dividing voltage corresponding to the constant voltage is generated while the transparent conductive film is touched to conduct the transparent conductive film and transparent conductive substrate. The main detecting module obtains a touch resistance value based on the constant voltage and the dividing voltage, compares the touch resistance value with a preset resistance value and determines that a multi-touch mode is executed when the touch resistance value is less than the preset resistance value.

Claims

1. A touch panel having a multi-touch function, comprising:

a transparent conductive substrate;

a transparent conductive film disposed on the transparent conductive substrate;

two first conducting wires disposed at two sides of the transparent conductive substrate, respectively to provide a constant voltage;

two second conducting wires disposed at two sides of the transparent conductive film, respectively, wherein the second conducting wires are vertical to the first conducting wires and used to provide the constant voltage, and when the transparent conductive film is touched, a dividing voltage is generated; and

a main detecting module obtaining a touch resistance value according to the constant voltage and the dividing voltage, comparing the touch resistance value with a preset resistance value and determining that a multi-touch mode is executed when the touch resistance value is less than the preset resistance value.

2. The touch panel having the multi-touch function according to claim 1, further comprising:

a processing module obtaining a position change of a touch point in the multi-touch mode and obtaining key information according to the position change to control an image displayed by the touch panel.

3. The touch panel having the multi-touch function according to claim 2, wherein the key information is a key definition of a keyboard or a mouse.

4. The touch panel having the multi-touch function according to claim 2, wherein the displayed image is one of rotating, zooming in, zooming out, page turning and controlling a scroll bar of the image.

5. A method for detecting a multi-touch used in a touch panel, comprising the steps of:

receiving a constant voltage by the touch panel;

generating a dividing voltage corresponding to the constant voltage;

obtaining a touch resistance value according to the constant voltage and the dividing voltage;

comparing the touch resistance value with a preset resistance value; and

determining that the touch panel executes a multi-touch mode when the touch resistance value is less than the preset resistance value.

6. The method for detecting the multi-touch according to claim 5, further comprising the steps of:

obtaining a position change of a touch point in the multi-touch mode;

obtaining key information according to the position change; and

controlling an image displayed by the touch panel according to the key information.

7. The method for detecting the multi-touch according to claim 6, wherein the key information is a key definition of a keyboard or a mouse.

8. The method for detecting the multi-touch according to claim 6, wherein the displayed image is one of rotating, enlarging, reducing, page turning and controlling a scroll bar of the image.

9. The method for detecting the multi-touch according to claim 5, wherein the touch panel is a four-wire resistive touch panel.