Resistive screens are comprised of several layers. The top layer, usually a clear polyester film, is flexible. When a finger presses down, the top layer comes in contact with a lower glass layer. The voltage is measured and the location of the press is computed.
Resistive touchscreens have delivered on the promise of sturdy, reliable and economical touch-based user interaction on a variety of applications. Input is possible with fingers, both bare and gloved, as well as with a stylus. In Asia, where a character alphabet is used, a stylus and handwriting recognition are necessary, so resistive screens are hugely popular there.
The downsides to resistive screens include less-than-perfect transparency, scratch-prone surfaces and components that wear out and break over time.
iPhone, the G1 and BlackBerry Storm all use the more sophisticated “capacitive” technology. Capacitive touchscreens work well with crystal-clear glass as the touch surface. A circuit board sensor beneath the glass registers changes in electrical capacitance, or charge, when activated by a finger’s electrical charge. No pressure is necessary to activate the capacitive sensor.
A gentle stroke or glide along the surface of a capacitive pad is all that is required. There are no moving parts to wear out over time, and with a rated life of over 1 million uses. That support handwriting recognition input with a stylus is the main reason why capacitive touchscreen phones will not be the wave of the future for most mobile phones. And any phone with a glass screen, including the iPhone and BlackBerry Storm, requires extra care. Web discussion forums are jammed with customers' tales of iPhone screens shattered after being dropped.
yunnlai wrote:
至於電容式, 標榜的就是 multi-touch (或 multi-finger). 不管 "摸" 了幾點, 都可以偵測出.
所以電容式可以變出更方便的用法. 最常見就是用 拇指和食指 直接控制, 縮放照片....(恕刪)
其實並不完全所有的電容式都是不管摸了幾點都可以偵測出..
有部分的Multi-touch是利用對角線畫出來的方塊大小來判斷放大或縮小
也就是說，沒辦法偵測兩支手指正確的位置 (一個方塊有兩條對角線..)
當然，可以偵測所有觸控的multi touch也是有的..
市場上的電容式觸控面板還是比電阻式貴上一截..
尤其玻璃式的...
貼合良率不高，所以價格一直高人一等..
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