PPT on ”Transparent Technology”
Overview Introduction History Components Technologies Pros & cons Applications Conclusion
Introduction A touch screen is a display that can detect the presence and location of a touch within the display area. Touch screen can also sense other passive objects such as stylus and finger. The display screen has a sensitive glass overlay placed on it and we can give the desired input by touching on it. Touch screen technology is becoming a part of our everyday lives now.
History 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, Accu Touch, was later developed by the founders of Elographics, Dr. Hurst and Bill Colwell
Components A basic touch screen has three main components : 1. Touch Sensor 2. Controller 3. Software Driver
Touch sensor A touch screen sensor is a clear glass panel with a touch responsive area. The touch sensor is placed over a display screen so that the responsive area of the panel covers the viewable area of the screen.
Controller The controller connects between the touch sensor and the processor. Take information from the touch sensor and translate it into information that processor can understand.
Software Driver The driver allow the touch screen and computer to work together This makes touching the screen as same as clicking the your mouse at the same location on the screen.
Diagram showing How it Works
Technologies Resistive Surface acoustic wave Capacitive Infrared Optical Imaging
Resistive Two layers of conductive material Touch creates contact between resistive layers completing circuit Voltage in circuit changes based on position Controller determines location based on voltages When an object, such as a finger, presses down on a point on the panel's outer surface the two metallic layers become connected at that point. This causes a change in the electrical current, which is registered as a touch event and sent to the controller for processing. It is used in Grocery Stores, Hotels, Restaurants and Retail Stores etc.
Capacitive A capacitive touch screen panel consists of an insulator such as glass, coated with a transparent conductor such as indium tin oxide (ITO). As the human body is also a conductor, touching the surface of the screen results in a distortion of the body's electrostatic field, measurable as a change in capacitance. Small amount of voltage applied to four corners of touch screen
Surface Acoustic Wave Touch Screens Surface consists of glass overlay with transmitting and receiving transducers Electrical signals sent to the transmitting transducers converts to ultrasonic waves Waves are directed across screen by reflectors then directed to receiving transducers When finger touches screen it absorbs waves
ResistiveInfraredSAWCapacitive Touch ResolutionHigh AverageHigh ClarityAverageGood OperationFinger or Stylus Finger or Soft- tipped Stylus Finger only DurabilityCan be Damaged by Sharp Objects Highly DurableSusceptible to Dirt and Moisture Highly durable Touch Screen Technology Comparison Chart
Pros & Cons Direct pointing to the objects Fast response Finger or pen is usable (No cable required) No keyboard necessary Suited to: novices, application for information retrieval etc Low precision by using finger User has to sit or stand closer to the screen The screen may be covered more by using hand No direct activation to the selected function
Applications Atm Airport terminal passenger internet and systems Smart Phones, Ipad Grocery Stores Museums Corporate Information Digital Camera
Corning Gorilla Glass Visually stunning, lightweight, and highly damage-resistant, Corning Gorilla Glass is changing the way the world thinks about glass. It helps protect the world’s coolest Smartphone's, Tablets, PCs, and TVs from everyday wear and tear. Many mobile manufacturing companies demand these type of glasses.
Features and Applications Stylish: Thin and Light, Seamless design High performance High resolution Fast response time 3D Cost efficient Anti-glare Environment friendly Low power consumption Superior picture quality
Conclusion Touch screens, touch panels or touch screen panels are display overlays which have the ability to display and receive information on the same screen. In future there is no usage of mouse and keyboards as they will be replaced by touch screen Designers are trying to use touch screen to simplify input commands for largely unsophisticated computer users.
References technoloy.html technoloy.html D. Chen, H. Miyoshi, T. Akai, and T. Yazawa, “Colourless transparent fluorescence material: Sintered porous glass containing rare-earth and transition-metal ions,” Appl. Phys. Lett., vol. 86, no. 23, pp –1, Jun
NOW THE HOUSE IS OPEN FOR QUERIES..... ????