Touch Screen Devices
by kari webb
Are used on some Samsung, HTC and LG phones, and are typical of ATMs, supermarket checkout stations and the electronic signature doodad the UPS guy carries - have a glass panel that’s covered with conductive and resistive metallic layers. These two layers are held apart by spacers, and an electrical current runs through them when the screen is operational. When a user touches the screen, the two layers make contact in that spot. The change in the electrical field is noted and the device coordinates the point of contact so a device driver can translate user touches and movements into something that the OS can understand.
Microsoft Surface: a touch screen table
- A new $10,000 touchscreen table
Touch Screen Computors
-This is a Windows 8 touchscreen laptop
Touch Screen Kindle
-Built in Wi-Fi - get books in 60 seconds. Sleek design - Only 213 grams, holds up to 3,000 books. Up to two month battery life
Are used on the iPhone, Droid Eris and Blackberry Storm, among other smartphones - have a glass screen covered by a transparent conductor layer that stores an electrical charge. When a user touches a finger (which is also conductive) to the screen, the electrical field distorts and the device uses that to figure out where the screen was touched and relays the info to the driver.
The big drawbacks of capacitative touchscreens
The big drawback of capacitative screens is that they don’t work well, or at all, when the user's fingers are covered by electrically insulating material, like gloves. If the choice between cold hands and using your phone is a hard one, you can get around the issue by buying gloves that have conductive threads woven into the fingertips, or by making your own.