Touch screen capable of isolating noise signals

• US 6,661,408 B2
• Filed: 03/23/2001
• Issued: 12/09/2003
• Est. Priority Date: 03/23/2001
• Status: Active Grant

• Current Assignee: Eturbotouch Technology Inc., Wistron Corporation
• Original Assignee: Eturbotouch Technology Inc.
• Inventors: Chen, Chi-Ruey
• Primary Examiner(s): Hjerpe, Richard
• Assistant Examiner(s): Tran, Henry N.
• Application Number:
  US09/814,842
• Publication Number:
  US 20020135568A1
• Time in Patent Office: 991 Days
• Field of Search: 345/173-178, 178/18-1-, 178/18-5-, 178/20.01, 178/20.02, 341/5, 341/24, 174/32, 174/35.R, 174/35.CE, 174/138.A
• US Class Current: 345/173
• CPC Class Codes: G06F 2203/04113 Peripheral electrode pattern in resistive digitisers, i.e. electrodes at the periphery of the resistive sheet are shaped in patterns enhancing linearity of induced field
• CPC Class Codes: G06F 3/0418 for error correction or compensation, e.g. based on parallax, calibration or alignment
• 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 screen capable of isolating noise signals is mainly a touch screen installing at the front side of a liquid crystal display (LCD) screen or cathode ray tube (CRT) for eliminating electromagnetic and radio frequency interference received by the LCD and CRT. The touch screen includes an antenna like conductive wire which is able to receive same noise signals mixed in the touch control signals. The touch screen controller uses the noise signals received by the antenna wire to offset the noise signals in the controller for increasing accuracy of the touch screen.

Claims

1. A current sensing type touch screen capable of eliminating noise signals, comprising a glass layer, a conductive membrane layer, a linearization pattern layer, an isolation layer, a five wire silver printing layer and a tail cable;

wherein;

four conductive wires are connected to four ends of the linearization pattern layer and another four ends are connected to a-controller, the fifth conductive wire having one end suspended and another end linked to the controller;

the four conductive wires are printed on one side of the glass layer and the fifth conductive wire is printed on another side of the glass layer; and

the fifth conductive wire detects noise signals which affect the controller, and the controller uses the noise signals conductive wire to eliminate interference caused by the noise signals in the controller thereby forming a five wire current sensing type touch screen with offset noise signals.

2. The touch screen of claim 1, wherein the conductive wire has a connection end.

3. The touch screen of claim 1, wherein the conductive wire is printed as rectangular border lines.

4. A five wire voltage sensing type touch screen capable of eliminating noise signals, comprising a glass layer, a first conductive membrane layer, an insulation points layer, a first isolation layer, a five wire silver printing layer, a second isolation layer, a second conductive membrane layer, and an additional membrane layer;

wherein;

four conductive wires are connected to four respective ends of the first and second conductive membrane layers and another four ends are connected to a controller the fifth conductive wire having one end suspended and another end linked to the controller;

the four conductive wires are printed on one side of the glass layer and the fifth conductive wire is printed on another side of the glass layer; and

the fifth conductive wire detects noise signals which affect the controller, and the controller uses the noise signals detected by the fifth conductive wire to eliminate interference caused by the noise signals in the controller, thereby forming a five wire voltage sensing type touch screen with offset noise signals.

5. The touch screen of claim 4, wherein the conductive wire has a connection end.

6. The touch screen of claim 4, wherein the conductive wire is printed on another side of the glass layer.

7. A six wire voltage sensing type touch screen capable of eliminating noise signals, comprising a glass layer, a first conductive membrane layer, a linearization pattern layer, an insulation points layer, a first isolation layer, a five wire silver printing layer, a second isolation layer, a second conductive membrane layer, and an additional membrane layer;

wherein;

five conductive wires are connected to five ends of the linearization pattern layer and another five ends are connected to a controller, the sixth conductive wire having one end suspended and another end linked to the controller;

the five conductive wires are printed on one side of the glass layer and the sixth conductive wire is printed on another side of the glass layer; and

the sixth conductive wire detects noise signals which affect the controller, and the controller uses the noise signals detected by the sixth conductive wire to eliminate interference caused by the noise signals in the controller, thereby forming a six wire voltage sensing type touch screen with offset noise signals.

8. The touch screen of claim 7, wherein the conductive wire has a connection end.

9. The touch screen of claim 7, wherein the conductive wire is printed as rectangular border lines.