A TOUCHSCREEN is an electronic visual display that can detect the presence and location of the Touch within the display area.
ADVANTAGES:
***It enables one to interact directly with what is displayed.
***It lets one to do so without requiring any intermediate device.
TWO most popular kinds of TOUCHSCREEN are,
1. RESISTIVE TOUCHSCREEN
2. CAPACITIVE TOUCHSCREEN
1. RESISTIVE TOUCHSCREEN:
A RESISTIVE TOUCHSCREEN has two thin layers of conductive, transparent film above the screen And measures the change in resistance between the two layers due to the presence of the touch.
RESISTIVE TOUCHSCREEN can be made pressure sensitive, so that applications can distinguish
Between a light touch and a heavy touch.
ADVANTAGES:
***Cheaper to make.
***You can use stylus to operate.
***You can use while wearing gloves.
DISADVANTAGES:
***Don't support multi-touch.
***Needs recalibration over time, but it’s a very simple operation.
RESISTIVE TOUCHSCREEN phones:
NOKIA N97, NOKIA 5800 XPRESSMUSIC, NOKIA 5230, NOKIA 5233, LG COOKIE, SONY ERICSSON, XPERIA X1 & X2.
2. CAPACITIVE TOUCHSCREEN:
A CAPACITIVE TOUCHSCREEN panel makes use of an effective insulator such as glass, coated with a Transparent conductor like idium tin oxide. Since human body is likewise a conductor, touching the surface of the screen results in distortion of the local electrostatic field, results in changes the in capacitance, which can be measured to detect the presence and location of the touch.
ADVANTAGES:
***Smooth to operate, because it just requires the presence of your finger, not any pressure.
DISADVANTAGES:
***You can't use stylus.
***You can't use while wearing gloves.
CAPACITIVE TOUCHSCREEN MOBILE PHONES:
APPLE IPHONE, PALM PRE, HTC HERO, LG ARENA, SAMSUNG OMNIA HD.
