Capacitive touch panel

• US 7,244,901 B1
• Filed: 04/11/2006
• Issued: 07/17/2007
• Est. Priority Date: 04/11/2006
• Status: Expired due to Fees

• Current Assignee: DanoTech Co., Ltd.
• Original Assignee: DanoTech Co., Ltd.
• Inventors: Li, Chia-Yen, Ku, Fu-Tien, Liao, Peter
• Primary Examiner(s): LEE, KYUNG S
• Application Number:
  US11/402,247
• Time in Patent Office: 462 Days
• Field of Search: 200/600, 345173-175, 345/177, 341 22- 25, 349/12, 349/130
• US Class Current: 200/600
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes
• CPC Class Codes: H03K 17/962 Capacitive touch switches
• CPC Class Codes: H03K 2017/9602 characterised by the type or shape of the sensing electrodes
• CPC Class Codes: H03K 2217/96015 Constructional details for touch switches

Abstract

The present invention discloses a capacitive touch panel, which comprises: an insulation substrate; an electrically-conductive layer, installed on the insulation substrate; and multiple electrically-conductive segments, installed on the perimeter of the electrically-conductive layer. The present invention improves the distribution characteristics of the electric field neighboring the frame of a touch panel via providing at least one chamfer for one end of each electrically-conductive segment. Thereby, the distribution of the electric field lines neighboring the frame can be smooth and uniform. Thus, the accuracy and the usable area of the touch panel are promoted.

Claims

1. A capacitive touch panel, comprising:

an insulation substrate;

an electrically-conductive layer, installed on said insulation substrate;

multiple electrically-conductive segments, installed on said electrically-conductive layer, with one end of each of said electrically-conductive segment having a chamfer and the center of said chamfer located at the centerline along the major axis of said electrically-conductive segment; and

wherein the width of each of said electrically-conductive segments is R, and the curvature radius of said chamfers is within the range from R/2 to 10R.

2. A capacitive touch panel, comprising:

an insulation substrate;

an electrically-conductive layer, installed on said insulation substrate;

multiple electrically-conductive segments, installed on said electrically-conductive layer, with one end of each said electrically-conductive segment having a chamfer; and

wherein the width of said electrically-conductive segments is R, and the curvature radius of said chamfer is within the range from R/10 to 10R.

3. The capacitive touch panel according to claim 2,

wherein one end of each of said electrically-conductive segment may have multiple chafers.

4. The capacitive touch panel according to claim 3,

wherein the positions of said chamfers are symmetrical with respect to the centerline along the major axis of said electrically-conductive segment.

5. The capacitive touch panel according to claim 3,

wherein the positions of said chamfers are unsymmetrical with respect to the centerline along the major axis of said electrically-conductive segment.