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Single side all-point-addressable clear glass substrate sensor design.

IP.com Disclosure Number: IPCOM000181473D
Publication Date: 2009-Apr-02
Document File: 3 page(s) / 21K

Publishing Venue

The IP.com Prior Art Database

Related People

Calvin Wang: INVENTOR [+2]

Abstract

A more sensitive and efficient projected capacitive touch sensor can be made by reducing the amount of capacitive coupling between the transmitting and receiving sensor electrodes.

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Single side all-point-addressable clear glass substrate sensor design Calvin Wang

Single side all-point-addressable clear glass substrate sensor design

1. Inventor(s): Calvin Wang, Bic Schediwy
2. Synaptics Incorporated, Santa Clara, CA, USA

3. Short Summary

A more sensitive and efficient projected capacitive touch sensor can be made by reducing the amount of capacitive coupling between the transmitting and receiving sensor electrodes.

4. Some Problems Solved

Examples of some of the problems addressed by the invention include:

The invention addresses the problem of high capacitive coupling between the transmitting and receiving electrodes in projected capacitive sensing schemes. The area of overlap between emitting and receiving sensor electrodes is prone to high capacitive coupling, largely due to the extreme thinness of the separation between the transmitting and receiving electrodes. This invention introduces a layout of the electrodes, specifically the shape and dimensions of the electrodes in the area of overlap, resulting in a low capacitive coupling without the need of additional manufacturing steps.

5. General Description

Figure 1. A simplified view of a crossing between electrodes

Figure 1 shows a close-up, simplified view of a potential crossing design between a transmitting (red) electrode and a receiving electrode (blue). The overlap of between the electrodes results in a capacitive

Copyright © 2009 Synaptics Incorporated, All Rights Reserved. Page: 1 of 3

Information contained in this publication is provided as-is, with no express or implied warranties, including any warranty of merchantability, fitness for any particular purpose, or non-infringement. Synaptics Incorporated assumes no liability whatsoever for any use of the information contained herein, including any liability for intellectual property infringement. This publication conveys no express or implied licenses to any intellectual property rights belonging to Synaptics or any other party. Synaptics may, from time to time and at its sole option, update the information contained herein without notice.

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Single side all-point-addressable clear glass substrate sensor design Calvin Wang

coupling, assuming a typical separation distance in the axis into and out of the page. Reducing the width of the receiving electrode can result in a lower coupling value between the transmitting and receiving electrodes, but the increase in resistance of the receiving electrode can outweigh the benefits of the reduced capacitive coupling. This is especially likely where conductive material such as Indium tin oxide (ITO) is used to form the electrodes.

By reducing the area of overlap between the transmitting and receiving electrodes, the capacitive coupling can be reduced. Figure 2 shows an impr...