touch screen (2)

8/7/2019 Touch Screen (2)

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TOUCH SCREEN TECHNOLOGY

PRESENTED BY:Niraj Shah Karan Shah


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I NTRODUCT I ON

A touchscreen is an electronic visual displaythat can detect the presence and location of atouch within the display area.

I nput device --> Operates a PC by simplytouching the display screen.

Made of sensitive glass overlay & desired inputscan be given by touching it.

I nputs --> External (light pen) or an internaldevice (touch overlay and controller) .


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C OMPONENTS O F T OUCH S CREEN T hree major components viz,

T ouch sensor

Controller

Software driver


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T OUCH S ENSORS

T ouchsensor

Covering screen


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T ouch sensor --> I n between clear glass panels.

Responsive area --> Entire viewable area of thedisplay screen.

Sensors --> Detects electrical current or signal.

T ouching -->causes a voltage or signal change,

thereby the location can be determined.


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C ONTROLLER


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PC card --> T ouch sensor and the PC.

Change in voltage --> T ranslated into theinformation that CPU understands.

T ranslated bits --> Position where the touchoccurs.

Processor --> change the screen accordingly.


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S OFTWARE D R IV ER

Acts as a bridge --> Controller and processor.

Makes the operating system --> T o interpret thetouch event information.

T ouch screen drivers today --> Mouse-emulation

type driver ( like touching the screen the same asclicking mouse)


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T ECHNOLOGY B EH I ND T OUCH S CREENS

Resistive T ouch screen

Surface wave T ouch screen

Capacitive T ouch screen


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RES I ST

IV E TOUCH SCREENS


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R ES I ST IV E T OUCH S CREEN


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W ORK I NG O F R ES I ST IV E T OUCH

S CREEN W ith a light touch, the conductive coating makeselectrical contact with the coating on the glass.

T he voltages at the point of contact are theanalog representation of the position touched.

T he controller digitizes these voltages andtransmits them to the computer for processing.


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C ONTROLLER NAME:

y M T S690R T ouchScreen Controller

Supply Voltagey 5 .0VDC

M aximum Current y 2

0mA

R esolutiony 12 -bit


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Advantages of Resistive

H igh AccuracyFast Response

Pressure-activated by finger or gloved hand witha very light touchDurable hard-coat front surface can be nonglaretreated for reflection control or polished formaximum clarityT ouchscreens and controllers are safety agency-approved components,so certification of yoursystem is easier


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P ROPERT I ES

2 conductive layers that connects when touched.

Capable of multi touch.

Not affected by dirt or dust.

Good for outdoor use.


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S URFACE W A V E T OUCH S CREEN


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S URFACE W A V E T OUCH S CREEN


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W ORK I NG O F S URFACE W A V E S ENSORS


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C ONTROLLER NAME:y 2701 R SU

CO NT R OLL E R

Voltagey +5 VDC

B aud R atey 96 00

Touch

Resolutiony 12b it, size independent

Conversion T imey 10 ms per coordinate

set


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C APAC I T

IV E T OUCH S CREEN


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C APAC I T IV E T OUCHSCREEN


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W ORK I NG O F C APAC I T IV E T OUCH S CREEN

Small amount of voltage is applied to the four corners ofthe touch screen.

A finger touches the screen and draws a minute amount ofcurrent to the point of contact , creating a voltage drop.

The x,y location of the point of contact is calculated by thecontroller and transmitted to the PC


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L AYERS O F C APAC I T IV E T OUCH S CREEN

Contains 3 layers ,viz

y Front Protective glass

y Back protective glass- provides optical & strength enhancement options

y Middle layer- laminated sensor grid of micro-fine wires


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A D V ANTAGES OF C APAC I T IV E T OUCH S CREEN

H igh T ouch ResolutionH igh Clarity

Completely SealableScratch resistant, durable surfaceH igh endurance ( 225 million touches)Very accurateGood optical clarity ( 88+ % transmissivity)Liquids won't affect touch screen performance


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D I SAD V ANTAGES OF C APAC I T IV E T OUCH

S CREEN

Must be touched by finger- will not work with

any non- conductive input

Can be affected by electricity

May need re-calibration often


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P ROS & C ONS O F T OUCH S CREEN

Direct pointing to theobjects.

Fast.

Finger or pen is usable (Nocable required)

No keyboard necessary

Suited to all interactiveapplications.

Low precision when we usefinger.

Screen may be coveredmore by using hand

No direct activation to theselected function

PROS CONS


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A PPL I CAT I ON Public I nformation Displays:::

y T ourism displaysy T rade show displayy Awareness kiosks

Customer Self-Services:::y General departmental Storesy Restaurantsy A T Msy Airline ticket terminals, etc.

Other uses:::y Cell Phonesy T ouch T abletsy Student Registration Systems, etc.


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L ATEST T OUCH S CREEN D E VI CES


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R ECENT TRENDS A PPLE I- P AD


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F EATURES O F I- PAD P rocessor1 GH z Apple A4 custom-designed, high-performance,low-power system-on-a-chipCapa city 3

1 6GB, 3 2 GB, or 64GB flashdriveD is pla y9.7-inch (diagonal) LED-backlitglossy widescreen Multi- T ouchdisplay with I PS technology1

02

4-by-768

-pixel resolution at1 32 pixels per inch (ppi)Fingerprint-resistant oleophobiccoatingSupport for display of multiplelanguages and characterssimultaneously


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S OME M ORE T OUCH S CREEN D E VI CES


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Microsoft Samsung Surface 2.0


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CONCLUS I ON

T hough the T ouch screen technology containssome limitations its

y User Friendly.y Fast.y Accurate.y Easy to Operate.

I t has been widely accepted and have replacedthe mouse and keyboard up to much extent.


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R EFRENCES W ikipediahttp://en.wikipedia.org/wiki/Touchscreen

T yco E lectronicshttp://www.elotouch.com/Products/detech2.asp

G oogleT ouch Screen T echnologyhttp ://www .authorstream.com


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THANK YOU

touch screen (2)

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