• what is to be explained

8/14/2019 What is to Be Explained..

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WHAT IS TO BE EXPLAINED..


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MAI N CO MPO NENTSAI N CO MPO NENTS

TOUCH SENSORTOUCH SENSOR

CONTROLLERCONTROLLER

SOFTWARE DRIVERSOFTWARE DRIVER

HOW DOES A TOUCHSCREEN

WORK?


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TOUCH SENS OROUCH SENS OR .A touch sensor is a clear glass panel with a touch

responsive surface .

The sensor generally has an electrical signal going

through it and touching the screen causing a signal

change.

The signal change is used to determine the location

of the touch to the screen.


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CONTROLLERONTROLLER The controller is

small PC card that

connects between

the touch sensor

and PC.

It takes information

from the touch

sensor and translatein to information that

PC can understand.


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SOF TWA RE DRI VEROF TWA RE DRI VERThe driver is a software that allows theThe driver is a software that allows the

touch screen and computer to worktouch screen and computer to work

together.together.

It tells the operating system how toIt tells the operating system how tointerpret the touch event information thatinterpret the touch event information that

sent from the controller.sent from the controller.

Most of the touch screen drivers todayMost of the touch screen drivers today

areare mousemouse emulation type driveremulation type driver ..


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WHY WE ARE USED TOUCH

SCREEN Si mpl if ie s the man /mach in e inte rface Becausetouch input is so simple and natural, touch screen requires notraining and no learning curve. Sui tab le for all en vi ronmen ts Rugged enough

for applications where a keyboard and mouse are notpractical, yet attractive enough for uses where appearance

is crucial.

Grea te r a ccur acy Clearly defined menus andintuitive touch virtually eliminate operator error.

Smal le r footprin t Input device is integrated intothe monitor, so no space is wasted.


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Response time Measured in milliseconds (ms), itreflects the screen's speed in reacting to touch. Mostscreens have response times between 8ms and 20ms;anything slower than 25ms may create problems forusers.

Touch contact requirement Also measured inmilliseconds, this denotes the amount of time you musttouch the screen before it reacts.

Touch resolution screen's ability to recognize touch

is measured in total number of The points per screen orpoints per inch (ppi). The higher the resolution, of course,the more accurate the determination of the locationtouched.


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Touch screen

1. Polyester Film

2. Upper Resistive Circuit

Layer

3. Conductive ITO

(Transparent MetalCoating)

4. Lower Resistive Circuit

Layer

5. Insulating Dots

6. Glass/Acrylic Substrate


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DIFFERENT TOUCH SCR EENIFFERENT TOUCH SCR EEN Surface wave

Resistive

Capacitive

Infrared


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Upper resistive

circuit layer

Flexible top layer

controller

Resi sti ve Touch S creenesi sti ve Touch S creenTechnol ogyechnol ogy

Metal

oxide

coating

Lowerresistive

circuit layer

Insulating

dots

glass


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ADVANTAGES :

Highly durable

Less susceptible

Less sensitive to the effects of severescratches

For industrial applications


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