Published on September 24, 2010
TOUCH SCREEN : TOUCH SCREEN D.ROOPA DEVIII-MCA10029 INTRODUCTION : INTRODUCTION A touchscreen is an electronic visual display that can detect the presence and location of a touch within the display area The screens are sensitive to pressure; a user interacts with the computer by touching pictures or words on the screen History : History Touchscreens emerged from corporate research labs in the second half of the 1940s. In everyday life. Companies use touch screens for kiosk systems in retail and tourist settings, point of sale systems, ATMs, and PDAs The HP-150 from 1983 was one of the world's earliest commercial touchscreen computer. Technologies : Technologies Resistive Surface acoustic wave Capacitive Surface capacitance Technologies(Cont’d) : Technologies(Cont’d) Projected capacitance Mutual Capacitance Self Capacitance Coded LCD: Bidirectional Screen : Coded LCD: Bidirectional Screen A new system that turns LCD displays into giant cameras that provide gestural control of objects on-screen Instead of an LCD, an array of pinholes is placed in front of sensors Light passing through each pinhole strikes a small block of sensors, producing a low-resolution image. Construction : Construction There are several principal ways to build a touchscreen Top polyester layer Adhesive spacer Glass layer Adhesive layer Development : Development The development of multipoint touchscreens facilitated the tracking of more than one finger on the screen As such, touchscreen displays are found today in airplanes, automobiles, gaming consoles, machine control systems The touchscreen market for mobile devices is projected to produce US$5 billion in 2009. Ergonomics and usage : Ergonomics and usage Finger stress Fingerprints Combined with haptics Gorilla arm How Does a Touchscreen Work? : How Does a Touchscreen Work? Touch Sensor Controller Drivers 3M Multi-Touch Technology : 3M Multi-Touch Technology 3M Multi-touch Technology offers software developers fast, accurate and simultaneous 20-finger multi touch functionality 3M Multi-touch Technology is compatible with Windows 7 by communicating directly (via USB HID protocol) Attributes : Attributes 20-finger multi-touch input Multi-user and multi-tasking capabilities Projected Capacitive touch technology with a durable glass front surface 3M Multi-touch Display M2256PW : 3M Multi-touch Display M2256PW The 22-inch 3MTM Display M2256PW, featuring industry-leading technology from its fast 20-finger multi-touch input to its high-definition It offers full multi-touch capabilities with less than 6 millisecond response time for 20 simultaneous touches Slide 15: 3M Multi-touch Display Slide 16: DISADVANTAGES Difficult to select small items Little electrical shocks when using with wet hands Reduction in Image brightness may occur Cost more than alternative devices.