1. Touch Screen Technology
Noor Al-Nassar

2. Overview : Introduction History Components Technologies Pros & Cons
Applications
Conclusion

3. 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.

4. History :
- Touch screen emerged from academic and corporate research labs.
- In 1971 , the first touch sensor was developed by Doctor Sam Hurts ( founder of Elographics ) while he was an instructor at the University of Kentucky.

5. - This sensor, called the “Elograph”.
- Touch screen first gained some visibility with the invention of the computer-assisted learning terminal, which came out in 1975 as part of the PLATO project.

6. components : A basic touch screen has three main components :
- Touch sensor.
- Controller
- Software drive.

7. 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.

8. Controller :
- The controller connects between the touch sensor and PC.
- Take information from the touch sensor and translate it into information that PC can understand.

9. Software drive :
- The drive allow the touch screen and computer to work together.
- This makes touching the screen as same as clicking the mouse at the same location on screen.

10. Technologies: - Resistive - Surface acoustic wave - Capacitive
- Infrared
- Optical imaging

11. Resistive : - Composed of several layers.
- Two Electrically conductive layers.

12. Surface acoustic wave :
- Uses ultrasonic waves.
- Surface wave touch screen panels can be damaged by outside elements.
- When the panel is touched, a portion of the wave is absorbed.

14. Open frame SAW Touch Monitor

15. Capacitive : - 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 screen’s electrostatic field, measurable as a change in capacitance.

17. Infrared :
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 pattern of LED beams.

18. Optical imaging :
In this two or more image sensor are placed around the edges of the screen. A touch shows up as a shadow and each pair of camera can then be pinpointed to locate the touch.

19. Comparison :

20. PROS & CONS

21. PROS : - User friendly. - Fast response. - Error free input.
- Use finger, fingernail, gloved hands, stylus or any soft tip pointer.
- Easy to clean.
- Does not interfere mouse and keyboard.
- Make computing easy, powerful and fun.
-It benefit children.

22. CONS : - Finger stress. - Fingerprints.
- 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.
- Fatigue.

23. Applications : - Museums. - Cell phones . - Library recourse guides.
- Corporate information.
- Airport terminal passenger internet and s.
- ATM’s.
- Restaurants'.

24. Conclusion :
- 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 keyboard as they will be replaced by touch screen.

25. References : http://en.wikipedia.org/wiki/Touchscreen
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