RESISTIVE TOUCH PANEL AND METHOD FOR DETECTING TOUCH POINTS THEREOF

• US 20100117983A1
• Filed: 11/02/2009
• Published: 05/13/2010
• Est. Priority Date: 11/10/2008
• Status: Abandoned Application

• Current Assignee: ASUSTek Computer, Inc.
• Original Assignee: ASUSTek Computer, Inc.
• Inventors: LIN, HUNG-YI, Huang, Yung-Lang
• Application Number:
  US12/610,423
• Publication Number:
  US 20100117983A1
• Time in Patent Office: Days
• US Class Current: 345/174
• 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
• CPC Class Codes: G06F 3/0488 using a touch-screen or digitiser, e.g. input of commands through traced gestures

Abstract

A resistive touch panel and a method for detecting touch points on the resistive touch panel are provided. The method includes steps as follows. The whole area of a touch panel is detected and a first touch point position is calculated during a touch point detecting procedure. The partial area of the touch panel including the first touch point position is detected and a second touch point position is calculated during a touch point verifying procedure. When the first touch point position and the second touch point position overlap each other, a single touch point is determined. When the first touch point position and the second touch point position do not overlap each other, multiple touch points are determined.

Claims

1. A method for detecting touch points of a resistive touch panel, comprising the steps of:

detecting the whole area of the touch panel and calculating a first touch point position during a touch point detecting procedure;

detecting the partial area of the touch panel which includes the first touch point position and calculating a second touch point position during a touch point verifying procedure;

confirming that a single touch point is generated when the first touch point position and the second touch point position overlap each other; and

confirming that multiple touch points are generated when the first touch point position and the second touch point position do not overlap each other.

2. The method for detecting the touch points according to claim 1, further comprising:

dividing the touch panel into multiple areas and determining the multiple touch points in sequence when the multiple touch points are confirmed.

3. A resistive touch panel comprising:

a first-direction first electrode group including multiple electrodes;

a first-direction second electrode group including multiple electrodes, wherein two ends of multiple first-group strip-shaped layers are connected to the first-direction first electrode group and the first-direction second electrode group, respectively;

a second-direction first electrode group including multiple electrodes;

a second-direction second electrode group including multiple electrodes, wherein two ends of multiple second-group strip-shaped layers are connected to the second-direction first electrode group and the second-direction second electrode group;

a multiplex switching circuit connected to all the electrodes; and

a control circuit controlling the multiplex switching circuit to selectively connect a first-direction first connecting line group to part or all electrodes in the first-direction first electrode group, connect a first-direction second connecting line group to part or all electrodes in the first-direction second electrode group, connect a second-direction first connecting line group to part or all electrodes in the second-direction first electrode group and connect a second-direction second connecting line group to part or all electrodes in the second-direction second electrode group.

4. The resistive touch panel according to claim 3, wherein during a touch point detecting procedure, the control circuit controls the multiplex switching circuit to connect the first-direction first connecting line group to all electrodes in the first-direction first electrode group, connect the first-direction second connecting line group to all electrodes in the first-direction second electrode group, connect the second-direction first connecting line group to all electrodes in the second-direction first electrode group, connect the second-direction second connecting line group to all electrodes in the second-direction second electrode group and determines a first touch point position.

5. The resistive touch panel according to claim 4, wherein during the touch point verifying procedure, the control circuit determines a first portion touch panel area and the first touch point position is included in the first portion touch panel area.

6. The resistive touch panel according to claim 5, wherein during the touch point verifying procedure, the control circuit determines the first portion touch panel area, and the control circuit controls the multiplex switching circuit to connect the first-direction first connecting line group to part of the electrodes in the first-direction first electrode group, connect the first-direction second connecting line group to part of the electrodes in the first-direction second electrode group, connect the second-direction first connecting line group to part of the electrodes in the second-direction first electrode group, connect the second-direction second connecting line group to part of the electrodes in the second-direction second electrode group and determines a second touch point position.

7. The resistive touch panel according to claim 6, wherein when the first touch point position and the second touch point position overlap, it is confirmed that a single touch point is generated, and when the first touch point position and the second touch point position do not overlap, it is confirmed that multiple touch points are generated.

8. The resistive touch panel according to claim 3, wherein each of the first-group strip-shaped layer and second-group strip-shaped layer is composed of an indium tin oxide (ITO) layer.