pickup electrodes 84 and the pickup lines 85 are made through holes in the substrate these holes may be formed by chemical etching laser drilling or other suitable process the conductive material in the holes may be deposited by either a chemical plating process of a deposition process the utility of this device is that the substrate may be thin and flexible and may be mounted to a flat or curved surface using a suitable adhesive after being manufactured fig9 a and 9 b show how a sensor is constructed with the second insulating layer limited to those areas where isolation is required between the drive lines and the pickup lines this reduces the need for resolution and accuracy in patterning the insulating layer providing insulation between the drive and pickup lines this is particularly useful when this layer cannot be accurately patterned such as when some plastic materials are used for the layer a first conducting layer 91 is placed on an insulating substrate 90 this layer is used to form the pickup electrodes 95 and pickup lines 96 insulating areas 98 are formed in a second insulating layer 92 where necessary for insulation between the pickup lines 96 and the combined drive lines and drive electrodes 97 the drive lines and drive electrodes are formed in a third conducting layer 93 a fourth insulating layer 94 is placed on top of the previous layer to provide protection for the array fig1 a and 10 b show how every other alternating pickup electrodes can be connected along a given pickup line this achieves less cross talk between.