touchscreenppt-130410103104-phpapp01.pptx

8/10/2019 touchscreenppt-130410103104-phpapp01.pptx

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Welcome to

touch screen world


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A display which can detect the presence and

location of a touch within the display area.

What is Touchscreen ?


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INTRODUCTION

In 1974, the first touch screen developed by

Sam Hurst and Elographics.

The HP-150 from 1983 was probably the

world's earliest commercial touchscreen

computer.

Now days, Multipoint touchscreen facilitates

the tracking of more than one finger on the

screen.


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How Does a

Touchscreen Work?

1.Touch Sensor

2.Controller

3. Software Driver


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1 Touchsensor


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2 Controller

A small PC cardwhich translates

information that PCcan understand.


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3 Software Driver

Driver allows towork with existing

software.


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echnologies

1. Resistive

2. Infrared

3. Capacitive

4. Surface acoustic wave


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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.


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Advantages of resistive touch

screen technology..

Lower cost.

Can operate with any pointing deviceslike stylus and nail.

Good for hand writing recognitionsystem.

Resistive touch screen is not effected

by any elements such as dust or water.


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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.


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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.


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Advantages of infrared touch

screen technology..

Best image quality.

Almost all kind of stylus materials can beused.

High stability, change in time andenvironment will not effect.

IR having no intermediate touch overlay so ittransmit 100% light.

It used in ATMs, plasma TV, Hospitaloperation room etc.


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Disadvantages of infrared touch

screen technology..

High pressure may causes unwanted

target selection.

Infrared touch screen having low

resolution.


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3. Capacitive

It consist of a glass panelwith capacitive (charge

storing) material coatingon its surface.

Circuits located at thecorners of the screenmeasure capacitance of aperson touching theoverlay.


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Advantages of capacitive touch

screen technology..

Visibility of the capacitive touch screen is goodeven in sunlight.

Highly sensitive to finger touch leading to easy touse.

Highly transmissivity transmit more than 85% oflight .

Capacitive touch screen can also implement multitouch gesture.

This technology is used in smart phones (e.g.

Apple iPhones , HTC mobiles and Samsung )


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4.Surface acoustic wave

Surface wave technologyuses ultrasonic wave that

passes over the touchscreen panel.

Widely used inapplication such ascomputer based trainingand information.


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Advantages of SAW touch screen

technology..

High Resolution.

SAW technology provides superior imageclarity.

Highly transmissivity transmit more than92% of light .

It has excellent durability that allow it tocontinue working if scratched.

This technology is used in ATMs, Bankingand Financial applications.


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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

wont work.

Relatively expansive in comparison to

other technologies .


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Applications

Many games use the touchscreens as a primary controllingdevice.

Touchscreens becomes familiar in kiosk systems (retail

and tourist settings).

The popularity of smart phones, ATMs, and many types ofinformation appliances is driving the demand fortouchscreens.

Touchscreens are popular in heavy industry and in othersituations, such as museum displays or room automation.


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Thank you.Presented by:Sayali

Anjali

AshwiniAnkita

Documents

touchscreenppt-130410103104-phpapp01.pptx