Touchscreens. They’re everywhere, as if electronics makers aren’t cool unless their phones or media players have them, and soon that will be true for laptops as well. Touchscreens aren’t going to completely replace the mouse and keyboard in the next year or two, but we’re hurtling toward a future where they’re the dominant way we interact with devices. The catch is that “touchscreen” can describe a few very different technologies that all perform a similar function. Here’s a breakdown of the most popular techniques for making touchscreen magic happen—and the crazy new techniques that will succumb to your caresses in years to come.

At a basic level, they all perform the same function—sensing a disturbance in the force when your finger or stylus or whatever pointy object you’ve got touches the screen, and then extrapolating that into knowing where you’re touching it and relaying that to the software. The differences lie in how each screen detects a touch.

Resistive touchscreens are the ones you’ve probably put your greasy fingers on more than any other kind, mostly because they’re the cheapest and oldest. They’re in most touchscreen cellphones, many tablets and the Nintendo DS, to name a very few.

How it works: On the bottom you’ve got a layer of glass, and on top of that, you’ve got two more: a conductive and a resistive layer. They’ve got a sliver of space between them. And on top of that you’ve got one more layer, which is the one you touch. So, when you push down on the screen, the conductive and resistive layer touch each other, which changes the electrical current running through ‘em, and the device can tell from that where your finger or stylus is touching.

Good and bad: While resistive is a good deal cheaper to manufacture at the moment, one downside is that it’s hard to do multitouch, because of the constraints and shortcomings of a pressure-based system. Another problem is that the multiple layers of touch technology on top of the LCD block an awful lot of light—think of how much dimmer the DS’s bottom screen is than the top one. read this entry »

This concept for a Wiimote of the future is showing over at T3, and yes… I know what you’re thinking. I do. Honest. But my real problem with the design is that it’s for just two years away, and do we really think Nintendo is going to redevelop things so radically by then? I’m sure fans would approve… but PS2 controllers haven’t evolved much over the years, in comparison. And I know it’s supposed to interact with that brainwave headset control, and that’s groovy. But I’m sure it’d kill Wii Fit stone dead, unless you’re talking mental agility. Still… with that cyberbabe to demonstrate the gizmos, I can’t complain too much. [T3 via Yanko]