TOUCHSCREENS
BY: YASHASWEE
TOUCHSCREENS
There are four different types of touchscreens: resistive, capacitive, infra red and surface acoustic wave (SAW), depending on what environment the touch screen will be confirm what type of touch screen you will use. Touch screens no matter what type, size or style all work in the same basic way. Contact is made on the screen, a signal is sent to the touch controller telling it what area was touched using X&Y coordinates, which is processed and then sent into the computer where the software you use confirms what action will be taken.
RESISTIVE
Resistive- Is the most commonly used touch screen because it is the strongest but is not the most sensitive. There are two layers in it which have a small gap in between and when you apply any pressure to the screen a contact is created by the top layer touching the bottom layer of the touchscreen.
CAPACITIVE
Capacitive – Has a steady voltage and when the front glass of the touch screen is touched it creates an electrostatic field and then the screen reacts by sending the information to the touch controller. Capacitive touchscreens can be controlled with a very light touch they are very sensitive. they cannot be used with gloved hands or mechanical stylus.
INFRA RED
Infra red – works with small infra red LEDs covered around the outer edges of the glass front and basically divides the surface of the screen into small squares. You can also use a stylus or have gloves on to make this work as it does not require a conductor, your finger is the one for it to work.