Touch Screen Technology
Group members Alisha Korpal Amandeep Singh Kalsi Kirandeep Kaur
- 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.
- Touch screens emerged from academic and corporate research labs
- In 1971, the first "Touch Sensor" was developed by Doctor Sam Hurst (founder of Elographics) while he was an instructor at the University of Kentucky.
- This sensor, called the “Elograph”.
- Touch screens first gained some visibility with the invention of the computer-assisted learning terminal, which came out in 1975 as part of the PLATO project .
- A basic touch screen has three main components :
- 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.
- The controller connects between the touch sensor and the PC.
- Take information from the touch sensor and translate it into information that PC can understand.
- 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.
- composed of several layers
- Two Electrically conductive layers
Surface acoustic wave
- Surface wave touch screen panels can be damaged by outside elements.
- When the panel is touched, a portion of the wave is absorbed.
Open Frame SAW Touch Monitor
- Consist of an insulator such as glass
- Coated with transparent conductor such as ITO (Indium Tin Oxide)
- touching the surface of the screen results in a distortion of the screen's electrostatic field, measurable as a change in capacitance.
- An infrared touch screen uses an array of X-Y infrared LED and photo detector pairs around the edges of the screen to detect a disruption in the pattern of LED beams.
- In this two or more image sensors are placed around the edges of the screen. A touch shows up as a shadow and each pair of cameras can then be pinpointed to locate the touch.
PROS & CONS
- Use finger , fingernail , gloved hands , stylus or any soft tip pointer
- Does not interfere mouse and keyboard
- Make computing easy , powerful and fun
- 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
- Airport terminal passenger internet and emails
- Designers are trying to use touch screen to simplify input commands
- Today , touch screen has becomes adopted by computers users of all abilities because it is simple, fast and innovative.
- In future there is no usage of mouse and keyboards as they will be replaced by touch screen .
- http:// www.google.co.in/#q = Touch+screen+technology&as_sitesearch = wikipedia.org&sa = X&ei =LjVqTf2TL86GrAfO7ujCCw&ved=0CC4Q2wE&hl= en&biw =1280&bih=869&fp=dcc4ce35a3a0f2a4
- http:// www.google.co.in/#sclient = psy&hl = en&site =&source= hp&q = ppts+on+touch+screen+technology&aq =0&aqi=g1&aql=& oq = PPTs+on+Touch+screen&fp =1&cad=b