5.5 inch surface capacitive touch screen technology
Here's a question: What is a technology that you can't see, but is essential to smartphones, tablets and other mobile devices -- and is estimated to generate $16 billion in revenues this year (according to DisplaySearch)? The answer is multitouch touch screens -- which have sparked the explosive growth of the mobile device market.
It was not so long ago that we would tap away on a PalmPilot with a tiny stylus, or exercise our thumbs on a BlackBerry micro-keyboard. Then, in January 2007, along came the Apple iPhone, and everything changed. Suddenly, people were wiping their fingers across screens, pinching images and performing other maneuvers that had not previously been part of the smartphone interface.
Now we not only take touch input for granted, we expect to be able to use multitouch (using more than one finger on the screen at a time) and gestures as well. What made this touch screen revolution possible, and where is it likely to take us?
Many paths to touch
To begin with, not all touch is created equal. There are many different touch technologies available to design engineers.
According to touch industry expert Geoff Walker of Walker Mobile, there are 18 distinctly different touch technologies available. Some rely on visible or infrared light; some use sound waves and some use force sensors. They all have individual combinations of advantages and disadvantages, including size, accuracy, reliability, durability, number of touches sensed and -- of course -- cost.
As it turns out, two of these technologies dominate the market for transparent touch technology applied to display screens in mobile devices. And the two approaches have very distinct differences. One requires moving parts, while the other is solid state. One relies on electrical resistance to sense touches, while the other relies on electrical capacitance. One is analog and the other is digital. (Analog approaches measure a change in the value of a signal, such as the voltage, while digital technologies rely on the binary choice between the presence and absence of a signal.) Their respective advantages and disadvantages present clearly different experiences to end users.
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