A SEMINAR ON TOUCH SCREEN Presented By TAUPHIK AHAMAD B.TECH ( 3rd year) (1002810094)DEPARTMENT OF COMPUTER SCIENCE & ENGINEERING IDEAL INSTITUTE OF TECHNOLOGY,GHAZIABAD (INDIA) (1012-13)
What is Touchscreen ?A display which can detect the presence andlocation of a touch within the display area.
INTRODUCTION In 1974, the first touch screen developed by Sam Hurst and Elographics. The HP-150 from 1983 was probably the worlds earliest commercial touchscreen computer. Now days, Multipoint touchscreen facilitates the tracking of more than one finger on the screen.
How Does a Touchscreen Work? 1. Touch Sensor 2. Controller3. Software Driver
1.Resistive • A resistive touchscreen panel is composed of several layers. • It consists of a glass that is coated with electrically conductive and resistive layers.
Advantages of resistive touch screen technology…..Lower cost.Can operate with any pointing devices like stylus and nail.Good for hand writing recognition system.Resistive touch screen is not effected by any elements such as dust or water.
Disadvantages of resistive touch screen technology…. Can be relatively easily damaged by scratching. Can be relatively easily damaged by impact. It emits only 75% of light which make the image relatively bulky and dim.
[2. Infrared ] The new generation IR touchscreen LCD has been increased brightness, clarity and durability.Touched with a finger, gloved hand, fingernail, or stylus, it delivers a fast, accurate response every time.
Advantages of infrared touch screen technology…..Best image quality.Almost all kind of stylus materials can be used.High stability, change in time and environment will not effect.IR having no intermediate touch overlay so it transmit 100% light.It used in ATMs, plasma TV, Hospital operation room etc.
Disadvantages of infrared touchscreen technology…..High pressure may causes unwanted target selection. Infrared touch screen having low resolution.
3. Capacitive It consist of a 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.
Advantages of capacitive touch screen technology….. Visibilityof 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 .Capacitive touch screen can also implement multi touch gesture.This technology is used in smart phones (e.g. Apple iPhones , HTC mobiles and Samsung )
Disadvantages of capacitive touch screen technology…..Can not be used with gloved hand and stylus. need to have at least 5% humidity to achieve capacitive effect .Capacitive touch screen is more expensive.
4.Surface acoustic wave Surface wave technology uses ultrasonic wave that passes over the touch screen panel. Widely used in application such as computer based training and information.
Advantages of SAW touch screen technology….. High Resolution.SAW technology provides superior image clarity.Highly transmissivity transmit more than 92% of light .It has excellent durability that allow it to continue working if scratched.This technology is used in ATMs, Banking and Financial applications.
Disadvantages of SAW touch screen 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. Relatively expansive in comparison to other technologies .
Applications Many games use the touchscreens as a primary controlling device. Touchscreens becomes familiar in kiosk systems (retail and tourist settings). The popularity of smart phones, ATMs, and many types of information appliances is driving the demand for touchscreens. Touchscreens are popular in heavy industry and in other situations, such as museum displays or room automation.