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WHAT IS A TOUCH SCREEN ?A Touch screen is an electronic visual display that can detect the presence and the location of a touch within the display area. Theterm generally refers to touching the display of the device with a finger or hand.
THE TOUCH SCREEN HAS TWO MAINATTRIBUTES First, it enables one to interact directly with what is displayed, rather than indirectly with a cursor controlled by a mouse or touchpad. Secondly, it lets one do so without requiring any intermediate device that would need to be held in the hand. Such displays can be attached to computers, or to networks as terminals.
TYPES OF TOUCH SCREEN TECHNOLOGY Resistive Surface wave Capacitive
RESISTIVE TECHNOLOGY A resistive touch screen panel is coated with a thin metallic electrically conductive and resistive layer that causes a change in the electric current which is registered as a touch event and sent to the controller for processing. Resistive touch screen panels are generally more affordable but offers only 75%clarity and the layer can be damaged by sharp objects. Resistive touch screen panels are not affected by outside elements such as dust or water.
SURFACE WAVE Surface wave technology uses ultrasonic waves that pass over the touch screen panel. When the panel is touched, a portion of the wave is observed. This change in the ultrasonic waves registers the position of the touch event and sends this information to the controller for processing. Surface wave touch screen panels are the most advanced of the three types, but they can be damaged by the outside elements.
CAPACITIVE A capacitive touch screen panel is coated with a material that stores electrical charges. When the panel is touched, a small amount of charge is drawn to the point of contact. Circuits located at each corners of the panel measure the charge and sends this information to the controller for processing. Capacitive touch screen panels must be touched with a finger unlike resistive and surface wave panels that can use fingers and stylus. They are not affected by the outside elements.
WHAT IS A TOUCH SCREEN USED FOR? Self-Service Check Outs ATM Machines PDAs iPhone Nintendo DS
SELF-SERVICE CHECK OUTS Many supermarkets use touch screens to save time for both customers and cashiers. Customers can weigh produce, look up codes, and choose methods of payment from touch screen displays.
ATM MACHINES Most ATM machines use touch screen technology. It allows users to input their information. without having to press buttons, which makes ATM use much easier.
PDAS PDAs are one of the first popular users of touch screen technology. Todays stand-alone PDAs are used for Internet browsing and media playing, but are declining in usage these days.
IPHONE The Apple iPhone uses its touch screen display to provide users with an easy way to navigate. Users can dial, text, listen to music and navigate the Web using the touch screen.
NINTENDO DS The Nintendo DS handheld video game system has two display screens, with the lower used for touch screen capabilities. Most of the games are played by using a stylus. Providing a very unique gaming experience.
Big screen is ideal for web browser, picture and movies. Touch screen gadgets usually have single user interfaces, which are more intuitive e.g. iphones. Touch screen devices have fewer buttons that might break after a few months/years of operation.
Screens has to be really big not to miss things when processing them with your finger. Big screens leads to low battery life massive computer power leads to slow devices. Touch screen means screen cant be read too well in direct sunlight as it applies an additional not 100% transparent. Screens get very dirty.
USES OF TOUCH SCREENS Public information display: A touch screen can help make your information more easily accessible by allowing users to navigate your presentation by simply touching the display screen. In restaurants system: Touch screen systems are easy to use so employees can get work done faster, and training time can be reduced for new employees. Customer self-service: Customers can quickly place their own orders or check themselves in or out, saving them time, and decreasing wait times for other customers.
Control and Automation Systems :The touch screen interface is useful in systems ranging from industrial process control to home automation. Computer Based Training :It can also help to make learning more fun and interactive, which can lead to a more beneficial training experience for both students and educators. Assistive Technology :The touch screen interface can be beneficial to those that have difficulty using other input devices such as a mouse or keyboard.