A little feedback from someone who KNOWS about touchscreens
I've finally given up lurking and registered here because of this thread. Why? Because I happen to be a touchscreen specialist. I work as an engineer for one of the major touchscreen manufacturers, and have been here over 12 years, so I know a little about not only the design and manufacture of touchscreens, but also about how people use them in real life. So, I thought this would be an ideal topic for me to jump in on
So, leaving aside details about exactly
which of the nine different touch technologies Apple are using (Projected Capacitive if you really want to know), I seriously doubt we will see a mainstream laptop device where a touchscreen is the primary point of input. The reason is that while a touchscreen on an iPod Touch or an iPhone draw low levels of power, the power
significantly increases for a glass based touch solution like this when you get over about 5" diagonal. Also, the way the screen is made (almost certainly ito sputtering onto a PET layer, is reasonably easy on small sizes, the yields fall off pretty rapidly as you increase the size. So, from a manufacturing/cost standpoint, we're not there yet. Also, the accuracy on a handhels device is typically between 5 or 10% of the viewing area diagonal. Think about it, on an iPhone, each button is reasonably big compared to the viewing area. Now, think of the same size button/icon on a 15" screen, and the accuracy required as a percentage of viewing area is a lot tighter. This means more complex electronics, so more cost and, more importantly, higher power consumption, reducing battery lifetime significantly (after all, the touchscreen would have to be always on to register a touch).
Seperately, most people find touch great for short periods of time, or where they're using maybe three or four buttons all the time. If it's more complex, people generally find it's too much hassle.
As for the idea of a second touch sensor to act as the whole keyboard, it's been tried by a few people. The drawback is that people find it ergonomically challenging, as they end up flicking their eyes a lot more between the two displays. On a physical keyboard, most people will concentrate on eith er the keyboard or the displa, not both together...
So, there's my view from the "inside". Hope this helps to stimulate debate.
