Transparent proximity sensor

• US 8,829,926 B2
• Filed: 03/18/2013
• Issued: 09/09/2014
• Est. Priority Date: 11/19/2012
• Status: Expired due to Fees

• Current Assignee: Zrro Technologies 2009 Ltd.
• Original Assignee: Zrro Technologies 2009 Ltd.
• Inventors: Zachut, Rafi, Rimon, Ori
• Primary Examiner(s): Nguyen, Tung X
• Assistant Examiner(s): Astacio-Oquendo, Giovanni
• Application Number:
  US13/845,472
• Publication Number:
  US 20140139239A1
• Time in Patent Office: 540 Days
• Field of Search: 324/658, 324/661, 324/679, 345173-178
• US Class Current: 324/658
• CPC Class Codes: G06F 2203/04101 2.5D-digitiser, i.e. digitiser detecting the X/Y position of the input means, finger or stylus, also when it does not touch, but is proximate to the digitiser's interaction surface and also measures the distance of the input means within a short range in the Z direction, possibly with a separate measurement setup
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes
• CPC Class Codes: G06F 3/0448 Details of the electrode shape, e.g. for enhancing the detection of touches, for generating specific electric field shapes, for enhancing display quality
• CPC Class Codes: H03K 17/955 using a capacitive detector

Abstract

A sensing surface is presented for use in monitoring a three dimensional behavior of one or more objects above the surface. The sensing surface is associated with a self-capacitance sensor and comprises a plurality of self-capacitive sensing pads located on a single layer. The sensing surface is configured for providing measured data indicative of a three-dimensional behavior of one or more objects over an active area of the sensing surface. The pattern of the pads is configured such that each sensing pad can be connected to an edge of the sensing surface on said single layer. The technique further enables the use of a capacitive sensor comprising the sensing surface.

Claims

1. A sensing surface for providing measured data indicative of a three-dimensional behavior of one or more objects thereover, comprising:

an edge, at the periphery of the sensing surface, through which the sensing surface can be connected to electrical circuitry;

a pads layer, in the area within said edge, comprising an insulating sheet and a plurality of sensing pads overlaying said insulating sheet, the sensing pads being arranged on said insulating sheet in a pattern configured such that each such sensing pad is isolated from one another and there is an electrical connection between each said sensing pad of said pattern and said edge, wherein at least some of said sensing pads are connected to said edge by means of a respective wire; and

an upper shielding layer, in the area within said edge, comprising a conductive material isolated from but overlaying said wires, said upper shielding layer being capable of shielding the wires over which it lays from electrical effects that may be caused by proximity of the one or more objects to said wire when in use.

2. The sensing surface of claim 1, comprising a lower shielding layer located under said insulating sheet, said lower shielding layer comprising a film of conductive material.

3. The sensing surface of claim 1, wherein all of the components of said sensing surface, other than said edge, are made of a transparent material.

4. The sensing surface of claim 1, wherein the pattern in which said sensing pads are arranged on said insulating sheet comprises an arrangement of spaced-apart sensing pads such that at least two spaced-apart sensing pads flank a sensing pad-less region, the sensing pad-less region being a region without sensing pad or a region through which one or more of said wires pass.

5. The sensing surface of claim 1, wherein said sensing pads are arranged in groups, each sensing pad belonging to one of the groups having a geometrical shape chosen such that the sensing pads of the groups form a desired shaped perimeter.

6. The sensing surface of claim 1, wherein the pattern in which said sensing pads are arranged on said insulating sheet is a checkered pattern.

7. The sensing surface of claim 1, wherein said sensing pads are arranged in spaced-apart parallel lines, and said wires are located in the spacings between the parallel lines.

8. The sensing surface of claim 7, wherein said upper shielding layer overlays each of said spacings between the parallel lines of sensing pads.

9. The sensing surface of claim 1, wherein all of said sensing pads and said wires are coplanar.

10. The sensing surface of claim 1, wherein a second insulating sheet is placed in-between the pads layer and the conductive material of the upper shielding layer.

11. The sensing surface of claim 1, wherein each said sensing pad is a self-capacitance sensing pad.

12. The sensing surface of claim 1, wherein said upper shielding layer also overlays a part of said sensing pads but leaving at least a part of each said sensing pad exposed.

13. The sensing surface of claim 1, wherein some of said sensing pads are electrically connected directly to said edge.