A touch screen or virtual touch screen is an integration of an output and input device into a touch sensitive surface. The touch screen is usually layered on top of an ordinary computer image of an input device such as a mouse or keyboard. The surface is often either an organic light-emitting diode (LED) or an LCD or LED screen while the device is typically a touch-sensitive mobile phone, tablet computer, or laptop. Many people who use touch-screen technology, especially for touch screen mobile phones, refer to this surface as a “gesture display”. The term is technically accurate, but most commonly when people speak of a touch screen they are really talking about a capacitive or resistive display.
Resistive touch screens are the easiest to use because they use pressure instead of touch. Capacitive touch screen can be difficult to program and use, because the user must actually press the screen to interact with it. Many people, however, like the feel of a capacitive touch screen because they must physically interact with the computer display to tell the system what they want done. Touch-screens are also more sensitive than resistive because they have a backlight which makes them more responsive. Some touch screens have both a resistive and capacitive feature.
A resistive touch screen has no moving parts because it is composed of a thin film of plastic that picks up an electric charge from a finger and disperses that charge throughout the entire touch sensitive surface of the unit. This type of touch screen generally includes a physical keypad along with push-pots which facilitate point-of-entry input by writing particular symbols or words onto the touch screen. Pins are used in the circuitry to sense the finger’s interaction with the computer. An example of a resistive touch screen uses a conductive metal screen that detects touch on either side of the screen. The use of a resistive material means that the computer system does not have to compensate for any changes in the surrounding environment.
A capacitive system uses a semi-transparent semi-permeable membrane called capacitance. The membrane is sensitive to changes in pressure changes that it comes into contact with. This means that a slight push on the screen will register as a finger touch on one side of the membrane but no pressure on the other side. capacitive systems can detect any finger motion on the touch point and can respond by releasing some, if not all, of the capacitance when the finger is released. When the finger is still pressing the touch point it will not release any of the capacitance.
A touch screen is also sensitive to changes in the ambient temperature of its surrounding environment. Changes in temperature cause some keys to light up more brightly than others. Newer touch screen technology has been developed that includes a variety of different solutions to this problem including resistive and capacitive mechanisms.
Many new touch screens include a stylus mechanism that is integrated right into the display screen. The stylus is used to manipulate the various features of the display, much like a finger would be. Some older touch screens only require a simple stylus and do not incorporate other accessories that may make using the laptop easier.
The best quality touch screens are the ones that have a high level of image clarity. When you look at an image on the screen, it should be highly visible and not need to be magnified. High resolution monitors provide a better viewing experience than lower resolution ones. There should be no distortion when viewing an image with a touch screen because the display technology used is so good. Some of the best high resolution monitors come with 3D technology built in.
Image clarity should be very high because it allows the user to make faster, more precise movements while working with the computer. A thin, light touch screen allows the user to perform fine movements without having to actually pick up and hold onto the mouse. This can also allow the user to tap on elements on the screen which would normally trigger a finger movement. Many people who work on their laptops are worried about dropping their laptops, but if the display technology is high enough there is little to worry about. The image clarity will make it very difficult for anything to hit the screen causing it to become broken.