Touch panel structure for increasing active area

• US 7,075,522 B2
• Filed: 03/06/2003
• Issued: 07/11/2006
• Est. Priority Date: 03/27/2002
• Status: Expired due to Fees

• Current Assignee: Inotouch Technology, Co., Ltd.
• Original Assignee: Inotouch Technology, Co., Ltd.
• Inventors: Han, Jae Heung
• Primary Examiner(s): Awad, Amr A.
• Assistant Examiner(s): Shapiro, Leonid
• Application Number:
  US10/379,693
• Publication Number:
  US 20030184527A1
• Time in Patent Office: 1,223 Days
• Field of Search: 345/173, 345156-157, 345/174, 178/18.01, 178/18.03, 178/18.05, 178/19.01, 178/19.04
• 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 3/045 using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact

Abstract

The present invention relates to a touch panel structure for increasing an active area of a touch panel. The touch panel structure comprises a resistive surface for constructing an inner portion of the panel taking the shape of a rectangle with four sides and four corners; a plurality of electrode segments arranged in a predetermined length and at a constant interval in the resistive surface adjacent to the four sides of the panel to be symmetric with each other disposed at corresponding positions; a plurality of compensation electrode segments arranged in a predetermined length and at a constant interval between the plurality of electrode segments and the sides of the panel to be symmetric with each other disposed at corresponding positions; and compensation patterns formed through connection of the electrode segments disposed at any side of the panel with the compensation electrode segments adjacent thereto. According to the present invention, it is possible to minimize the voltage gradient or voltage drop generated from the corners of the panel to the middle portions of the sides of the panel owing to the compensation electrode segments and the compensation patterns, thereby increasing an effective active area of the panel and securing linearity of equipotential lines in the panel.

Claims

1. A touch panel structure for increasing an active area of a touch panel, comprising:

a resistive surface for constructing an inner portion of the panel taking the shape of a rectangle with four sides and four corners;

a plurality of electrode segments arranged in a predetermined length and at a constant interval in the resistive surface adjacent to the four sides of the panel to be symmetric with each other disposed at corresponding positions;

a plurality of compensation electrode segments, including first compensation electrode segments and second compensation electrode segments, arranged in a predetermined length and at a constant interval between the plurality of electrode segments and the sides of the panel to be symmetric with each other disposed at corresponding positions, said first and second said compensation electrode segments being arranged in different lines; and

compensation patterns formed through connection of the electrode segments disposed at any side of the panel with the compensation electrode segments adjacent thereto, wherein first said compensation patterns connect said eletrode segments with said first compensation electrode segments, and second said compensation patterns connect said electrode segments with said first compensation segments and said second compensation electrode segments.

2. The touch panel structure as claimed in claim 1, further comprising “

Z-shaped”

edge electrodes arranged in the resistive surface at both ends of each of the four sides of the panel with the four corners of the panel interposed therebetween.

3. The touch panel structure as claimed in claim 2, wherein the edge electrodes are arranged between the plurality of electrode segments and the sides of the panel.

4. The touch panel structure as claimed in claim 2 or 3, wherein the electrode segments, the compensation electrode segments, the compensation patterns and the edge electrodes are formed through a printing process for metals or metal compounds.

5. The touch panel structure as claimed in claim 1, wherein the compensation patterns are arranged in middle portions of the four sides of the panel, or at portions where a voltage gradient or voltage drop occurs.

6. The touch panel structure as claimed in claim 1, wherein the compensation patterns are widened from the resistive surface toward the sides of the panel.

7. The touch panel structure as claimed in claim 1, further comprising third electrode compensation segments arranged in a third line, and third compensation patterns connecting said electrode segments with said first electrode compensation segments, said second electrode compensation segments, and said third electrode compensation segments.