Standard four-wire resistive touch-screen technology depends on a uniform Indium Tin Oxide (ITO) coating as a voltage divider. Operation entails applying a voltage gradient across the resistive surface of one layer and measuring the voltage on the other. Touch-screen life and positional accuracy depend on maintaining ITO uniformity on each substrate, andminimizing positional drift due to property changes.
The ITO voltage divider is difficult to apply uniformly, and it's resistance changes with temperature, humidity, general use, and abuse. The result is positional drift and a need for constant recalibration.
This design uses a proprietary deposited resistor instead of ITO as a voltage divider. The result is a more durable design that is less expensive to manufacture, and requires no recalibration. Eliminating the ITO results in higher process yields and a 10 to 20% cost savings.
Brian Heiser, CAM Graphics Co., 15 Ranick Drive, Amityville, NY 11701; (516) 842-3400.
At the Design News webinar on June 27, learn all about aluminum extrusion: designing the right shape so it costs the least, is simplest to manufacture, and best fits the application's structural requirements.
For industrial control applications, or even a simple assembly line, that machine can go almost 24/7 without a break. But what happens when the task is a little more complex? That’s where the “smart” machine would come in. The smart machine is one that has some simple (or complex in some cases) processing capability to be able to adapt to changing conditions. Such machines are suited for a host of applications, including automotive, aerospace, defense, medical, computers and electronics, telecommunications, consumer goods, and so on. This radio show will show what’s possible with smart machines, and what tradeoffs need to be made to implement such a solution.