8/3/2019 touch ppt

http://slidepdf.com/reader/full/touch-ppt 1/21

BY: PRIYANKA KHARAYAT AND

MANISH NEGI

8/3/2019 touch ppt

http://slidepdf.com/reader/full/touch-ppt 2/21

Touch screen technologyy It provides the most direct interaction that is possible

on computers .

y It is a electronic visual display that can detect thepresence and location of a touch.

y It provides direct onscreen input.

8/3/2019 touch ppt

http://slidepdf.com/reader/full/touch-ppt 3/21

How does touch screen work?

8/3/2019 touch ppt

http://slidepdf.com/reader/full/touch-ppt 4/21

Main touch screen components

1.

Touch sensor2. Controller

3. Software driver

8/3/2019 touch ppt

http://slidepdf.com/reader/full/touch-ppt 5/21

Touch sensor

y Clear glass panel .

y It has touch responsive surface.

y Generally it has an electrical current or signalgoing through it

y Signal change is used to determine the location of the touch to the screen

8/3/2019 touch ppt

http://slidepdf.com/reader/full/touch-ppt 6/21

controllery The controller is a small

PC card that connects

between the touchsensor and the PC. Ittakes information fromthe touch sensor andtranslates it intoinformation that PC canunderstand.

8/3/2019 touch ppt

http://slidepdf.com/reader/full/touch-ppt 7/21

Software driver

The driver is a software that allows the touch screen

and computer to work together. It tells the operatingsystem how to interpret the touch event informationthat is sent from the controller.

8/3/2019 touch ppt

http://slidepdf.com/reader/full/touch-ppt 8/21

Types of touch screen

1. Resistive Touch screen

2. Capacitive Touch screen

*Surface capacitive

*Projected capacitive3. . Infrared Touch screen

4 Surface wave Touch screen

8/3/2019 touch ppt

http://slidepdf.com/reader/full/touch-ppt 9/21

Resistive touch screen

8/3/2019 touch ppt

http://slidepdf.com/reader/full/touch-ppt 10/21

y Two ResistiveSurfaces(Indium-Tin-Oxide)

y Metallically-coated

y Insulating Space

y Touch compresses andforms closed circuit

8/3/2019 touch ppt

http://slidepdf.com/reader/full/touch-ppt 11/21

capactive touch screen

8/3/2019 touch ppt

http://slidepdf.com/reader/full/touch-ppt 12/21

Surf ace capactive touch screeny Uniform conductive coating on a glass panel.

y It has an uniform electric field.

8/3/2019 touch ppt

http://slidepdf.com/reader/full/touch-ppt 13/21

Projected capactive touch screeny It has three layers.

y Front and back protective glass provides optical andstrength enhancement.

y Middle layer consists of laminated sensor grid of 

micro-fine wires

8/3/2019 touch ppt

http://slidepdf.com/reader/full/touch-ppt 14/21

8/3/2019 touch ppt

http://slidepdf.com/reader/full/touch-ppt 15/21

Infrared touch screeny It relies on the interruption of an IR light grid in front

of the display screen..

yIt contains a row of IR-light emitting diode (LEDs) andphoto transistors.

y Each mounted on two opposite sides.

y When touch produced ,it obstructs the beams.

8/3/2019 touch ppt

http://slidepdf.com/reader/full/touch-ppt 16/21

Surface Acoustic Wave touch

screen

yBased upon emission and absorption of sound waves

yMaterials used:

Glass screen

TransducersReflectors

Sensors

8/3/2019 touch ppt

http://slidepdf.com/reader/full/touch-ppt 17/21

8/3/2019 touch ppt

http://slidepdf.com/reader/full/touch-ppt 18/21

Advantages of touch screeny Most direct interaction.

y Easier to pin point

y Better drag and dropy Extra resolution

y Better sealing

y Better sensitive to environment

8/3/2019 touch ppt

http://slidepdf.com/reader/full/touch-ppt 19/21

Disadvantages

y Manufacturing cost is high

y Special types of material required for production

y Maintenance cost is highy Only replaceable in nature

8/3/2019 touch ppt

http://slidepdf.com/reader/full/touch-ppt 20/21

applications1. Public Information Displays..

Tourism displays, Trade show display 

2. Customer Self-Services..Stores, Restaurants, ATMs, Airline ticket terminals andTransportation hubs.

3. More uses...Computerized gaming, Student Registration systems,Multimedia softwares , Scientific applications etc.

8/3/2019 touch ppt

http://slidepdf.com/reader/full/touch-ppt 21/21

THANK YOU