INSTITUTE OF BUSINESS MANAGEMENT COLLEGE OF BUSINESS MANAGEMENT MIS 102E-Computer Concepts Touch Sensor TechnologyStudent ID: 2012-1-93-14425Student Name: Sohail Mumtaz KhanProgram: BBA (H)Course: Computer ConceptsFaculty: Sir Faisal Mushabbar
Points of Discussion Introduction to touch technology History & Development Touch Sensor Types of Touch Technologies Applications Advantages Disadvantages Closing Thought
IntroductionA touch screen is an electronic visualdisplay that can detect the presenceand location of a touch within thedisplay area. Touch screens can senseFinger and other passive objects, suchas a stylus. However, if the objectsensed is active, as with a light pen.
History & Development• In 1971 Dr. Sam Hurst, founder of Elographics developed the first touch opaque sensor “Elograph” at the University of Kentucky.• In 1974 He developed the first real touch screen.• In 1977, Elographics developed the five-wire resistive technology then with the backing of Siemens Corporation, developed a curved glass sensor called the touch screen.• The new transparent technology, AccuTouch, was later developed by the founders of Elographics, Dr. Hurst and Bill Colwell
Touch Sensor A touch screen sensor is a clear glass panel with a touch responsive surface which is placed over a display screen so that the responsive area of the panel covers the viewable area of the display screen. The sensor generally has an electrical current or signal going through it and touching the screen causes a voltage or signal change. This voltage change is used to determine the location of the touch to the screen
Types of Touch TechnologiesThere are mainly 4 types of touch Technologies:-1.Resistive2. Surface acoustic wave3. Capacitive4. Infrared
Resistive A resistive touch screen panel is composedof several layers, the most important ofwhich are two thin, metallic, electricallyconductive layers separated by a narrowgap. When an object, such as a finger,presses down on a point on the panels outersurface the two metallic layers becomeconnected at that point. This causes achange in the electrical current, which isregistered as a touch event and sent tothe controller for processing. It is usedin Grocery Stores, Hotels, Restaurants andRetail Stores.
Surface Acoustic Wave (SAW) Surface acoustic wave (SAW)technologyuses ultrasonic waves that passover the touch screen panel.When the panel is touched, aportion of the wave isabsorbed. This change in theultrasonic waves registers theposition of the touch event andsends this information tothe controller for processing.SAW touch screen technologyis suggested for use in ATMs,Amusement Parks, GamingEnvironments, IndustrialControl Rooms etc.
Capacitive A capacitive touch screen panelconsists of an insulator suchas glass, coated with atransparent conductor suchas indium tin oxide (ITO). As thehuman body is also a conductor,touching the surface of the screenresults in a distortion of thebodys electrostatic field,measurable as a changein capacitance.
Applications of Touch Screens•Informational kiosks•Trade show displays•Museum / tourism displays•Point-of-sale terminals•Restaurant systems•Employee time clocks•Industrial process controls•World Wide Web access kiosks•Home automation systems•Casino and other gaming systems•Computer access for the physically disabled
Advantages of Touch TechnologyTouch screens have several advantages over other pointing devices:• A touch screen is easy to use (as the user simply touches what he or she sees on the display).• Save space as no buttons are required.• Touching a visual display of choices requires little thinking and is a form of direct manipulation that is easy to learn.• Touch screens are the fastest pointing devices.• Touch screens have easier hand eye coordination than buttons.• Touch screens are durable in public access and in high volume usage.
Disadvantages of Touch Technology• Screen has to be really big not to miss things when pressing them with your finger:• Big screen leads to low battery life.• Touch screen means screen can’t be read too well in direct sunlight as it applies an additional not 100% transparent.• Touch screen devices usually has no additional keys (see the iPhone) and this means when an app crashes, without crashing the OS, you can’t get to the main menu as the whole screen becomes unresponsive.• Most user interfaces are not optimized for thumb operation, so a stylus in necessary, and this means using two hands• Screens get very dirty.• These devices require massive computing power which leads to slow devices.
CLOSING THOUGHTS Though the touch sensortechnology contains somelimitations it’s very userfriendly, fast, accurate, easyfor the novices & fun tooperate. It has been widelyaccepted. And now by justmodifying a little it canreplace the mouse and keyboard completely in nearfuture.