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Appendix
Appendix B: Touchscreen
This section includes information on projected capacitive touchscreen (p-cap), its technology and
specifications.
Overview
Projected Capacitive Touch (PCAP) technology is a variant of capacitive touch technology. All
PCAP touch screens are made up of a matrix of rows and columns of conductive material, layered
on sheets of glass. Projected capacitive technology enables touches to be sensed through a
protective layer in front of a display, allowing touch monitors to be installed behind store windows
or vandal-resistant glass. In addition, the surface material is glass, which is scratch-resistant,
durable, and reliable in harsh environments.
The operational theory of a PCAP touch screen begins with two patterned Indium Tin Oxide (ITO)
layers under a glass substrate cover which create a X-axis and Y-axis electric field. These electric
fields project above the glass surface between adjacent ITO traces. When a finger approaches
the glass surface, a new balance in the electric field will be established between the finger and
the corresponding X-axis and Y-axis. The controller IC will locate the ITO traces exhibiting
capacitance changes to pinpoint the finger touch accurately.
Specifications
Subject
Details
Input Method
Finger, gloved hand
Positional Accuracy
<1.5% of reported position in recommended viewing area.
Resolution
Touch point density is based on controller resolution of 4096 x 4096
Touch Activation Force No minimum touch activation force is required
Light Transmission
Up to 90% per ASTM D1003-92
Summary of Contents for R15IB3S-65EX
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