touchscreen 1
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WHAT IS TO BE EXPLAINED..
INTRODUCTION TO THEINTRODUCTION TO THE
TECHNOLOGYTECHNOLOGY
HOW IT WORKS ?HOW IT WORKS ?
TOUCH SCREEN DIVERSITYTOUCH SCREEN DIVERSITY
CONTROLERS USEDCONTROLERS USEDAPPLICATIONSAPPLICATIONS
CLOSING THOUGHTSCLOSING THOUGHTS
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HOW DOES A TOUCHSCREEN WORK?
Main touch screen components:Main touch screen components:
Touch sensor
Controller
Software driver
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CONTROLLER
The controller is a
small PC card that
connects between the
touch sensor and the
PC. It takes
information from the
touch sensor and
translates it into
information that PC
can understand.
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SOFTWARE DRIVER
The driver is a software that allows the touch screen
and computer to work together. It tells the operating
system how to interpret the touch event information
that is sent from the controller.
Most touch screen drivers today are a mouse-
emulation type driver. This makes touching the
screen the same as clicking your mouse at the same
location on the screen.
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TOUCH SCREEN DIVERSITY
Resistive Touch screen
Surface wave Touch screen
Capacitive Touch screen*Surface capacitive
*Projected capacitive
Near Field Imaging Touch screen
Infrared Touch screen
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RESISTIVE TOUCH SCREEN
1. Polyester Film .
2. Top Resistive Layer.
3. Conductive Transparent Metal Coating.4. Bottom Resistive Layer .
5. Insulating Dots .
6. Glass Substrate
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Continued
Resistive touch screen monitor is composed of a flexibletop layer and a rigid bottom layer separated by insulating
dots, attached to a touch screen controller.
The inside surface of each of the two layers is coated with
a transparent metal oxide coating Pressing the flexible top sheet creates electrical contact
between the resistive layers, producing a switch closing in
the circuit.
The controller gets the alternating voltages between the
two layers and converts them into the digital X and Y
coordinates of the activated area.
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VS20UA CONTROLLER
Supply Voltage
5.0V DC
Maximum
Current
20mA (Pick)
Resolution
12-bit
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SURFACE WAVE TECHNOLOGY
It has a transmitting and receiving transducers for boththe X and Y axes.
The touchscreen controller sends a 5 MHz electrical signal
to the transmitting transducer, which converts the signalinto ultrasonic waves within the glass.
These waves are directed across the front surface of thetouchscreen by an array of reflectors.
Reflectors on the opposite side gather and direct thewaves to the receiving transducer, which reconverts theminto an electrical signala digital map of the touchscreen
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Continued When you touch the screen, you absorb a portion of
the wave traveling across it. The received signal is thencompared to the stored digital map, the changerecognized, and a coordinate calculated. . The digitizedcoordinates are transmitted to the computer forprocessing.
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2701RSU CONTROLLER
Voltaze
+5 VDC
Baud Rate
9600 (default) and 19200
Touch Resolution
12bit, size independent
Conversion Time
10 ms per coordinate set
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CAPACITIVE TOUCH SCREENS
Surface Capacitive
It has a an uniform conductive coating on a glasspanel.
During operation, electrodes around the panel'sedge evenly distribute a low voltage across theconductive layer & creates an uniform electricfield.
A finger touch draws current from each corner.
Then the controller measures the ratio of thecurrent flow from the corners and calculates thetouch location
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5000 RSU SERIAL CONTROLLER
Supply Voltage :
+5 V DC or +12V
Baud Rate
9600 (default) and 19200
Touch Resolution
12bit, size independent.
Conversion Time
Approximately 15 ms percoordinate set
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Projected Capacitive
Touch screen
3layers:-front and
back protective glass
provides optical and
strength enhancement
options & middle
layer consists of a
laminated sensor grid
of micro-fine wires
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Continued During a touch,
capacitance formsbetween thefinger and thesensor grid.
The embeddedserial controller inthe touch screencalculates touch
locationcoordinates andtransmits them tothe computer forprocessing.
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APPLICATIONS..
Public Information Displays:::Tourism displays, Trade show display
Customer Self-Services:::Stores, Restaurants, ATMs, Airline ticketterminals and Transportation hubs.
More uses...Digital jukeboxes, Computerized gaming, StudentRegistration systems, Multimedia softwares ,Scientific applications etc.
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Pros & ConsDirect pointing to the
objects.
Fast
Finger or pen is usable(No cable required)
No keyboard necessary
Suited to: novices,
application forinformation retrievaletc
Low precision by usingfinger
User has to sit orstand closer to thescreen
The screen may becovered more by usinghand
No direct activation tothe selected function
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