Download - Touch Screen
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TOUCH SCREENS
Represented by: Affan
Naim Roll:
114005
Comp. Sc & Engg
Orissa Engineering College
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INTRODUCTION HISTORY WORKING TECHNOLOGIES COMPARISON APPLICATION CONCLUSION
OVERVIEW
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INTRODUCTION
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HISTORY
In 1971, the first touch screen developed by SAM HURST.
The HP-150 from 1983 was probably the world’s earliest commercial touch screen computer.
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HOW DOES A TOUCH SCREEN WORK
HOW DOES A TOUCH SCREEN WORK
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TOUCH SENSOR
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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.
CONTROLLER
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The driver is a software that allows the touch screen and computer to work together
SOFTWARE DRIVER
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Resistive Capacitive Infrared Surface
Acoustic Wave
TECHNOLOGIES
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RESISTIVE
A resistive touchscreen panel is composed of several layers.
It consists of a glass that is coated with electrically conductive and resistive layers.
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Lower Cost. Can operate with any pointing
devices like stylus and nails. Good for hand writing recognition
system.
Advantages of Resistive touch screen technology…
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Can be relatively easily damaged by scratching.
It emits only 75% of light which make the image relatively bulky and dim
Disadvantages of Resistive touch screen technology…
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It consist of glass panel with capacitive (charge storing) material coating on its surface.
Circuits located at the corners of the screen measure capacitance of a person touching the overlay.
CAPACITIVE
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Visibility of the capacitive touch screen is good even in sunlight.
Highly sensitive to finger touch leading to easy to use.
Highly transmissivity transmit more than 85% of light.
Advantages of Capacitive touch screen technology…
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It is expensive Can not be used with gloved
hand and stylus. Need to have at least 5%
humidity to achieve capacitive effect.
Disadvantages of Capacitive
touch screen technology…
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The 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.
INFRARED
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Best image quality Almost all kind of stylus materials
can be used. High stability, change in time and
environment will not effect.
Advantages of Infrared touch screen technology…
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High pressure may causes unwanted target selection.
Infrared touch screen has low resolution.
Disadvantages of Infrared touch screen technology…
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Surface wave technology uses ultrasonic wave that passes over the touch screen panel.
Widely used in application such as computer based training and information.
SURFACE ACOUSTIC WAVE
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High resolution. SAW technology provides
superior image quality. Highly transmissivity transmit
more than 92% of light.
Advantages of SAW touch screen technology…
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Relatively expansive in comparison to other technology.
It must be touched by finger, gloved hand and soft stylus, something hard like a pen, credit card or finger nail won’t work.
Disadvantages of SAW touch screen technology…
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COMPARISON
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Smart phones ATM’s Airline ticket terminals Restaurants.
APPLICATION
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Designers are trying to use touch screen to simplify inputs commands.
Today, touch screen has become adopted by computers users of all abilities because it is simple, fast and innovative.
CONCLUSION
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THANK YOU