PPT on Touchscreen Technology by Satyam of HNB Garhwal Universeity

1. TOUCH SCREENTOUCH SCREEN
TECHNOLOGYTECHNOLOGY
Presented by:- Satyam SinghSatyam Singh
Department of Electronics and Communication Engineering
School of Engineering and Technology
H.N.B.Garhwal Central University ,Srinagar Garhwal
2018-19
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2. CONTENTCONTENT
1- Introduction
2- History and Development
3- First touch devices
4- Types of touch technology
5- Advantages and Disadvantages
6- Touch screen comprasion chat
7- Conclusion
8- Reference
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3. INTRODUCTIONINTRODUCTION
A touch screen is an electronic visual
display that can detect the presence
and location of a touch within the
display area. Touch screens can sense
Finger and other passive objects, such
as a stylus. However, if the object
sensed is active, as with a light pen.
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4. History & DevelopmentHistory & Development
 In 1971 Dr. Sam Hurst, founder of
Elographics developed the first touch
opaque sensor “Elograph” at the University
of Kentucky.
 In 1974 He developed the first real touch
screen.
 In 1977, Elographics developed the five-wire
resistive technology then with the backing of
Siemens Corporation, developed a curved
glass sensor called the touch screen.
 The new transparent technology, AccuTouch, was later developed
by the founders of Elographics, Dr. Hurst and Bill Colwell
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5. First Touch Phone First Touch Mobile
Apple was the first with
a touch screen phone
in 1983.
The Nokia 7710 is a first
touch screen mobile phone
model produced by Nokia.
The 7710 is based on
the Nokia 7700 .
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6. Types of Touch TechnologiesTypes of Touch Technologies
There are mainly 4 types of touch Technologies:-
1.Resistive
2. Surface acoustic wave
3. Capacitive
4. Infrared
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7. ResistiveResistive
A resistive touch screen panel is
composed of several layers, the most
important of which are two thin,
metallic,electrically
conductive layers separated by a
narrow gap. When an object, such as
a finger, presses down on a point on
the panel's outer surface the two
metallic layers become connected at
that point. This causes a change in
the electrical current, which is
registered as a touch event and sent
to the controller for processing.
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8. Advantages & Disadvantages of ResistiveAdvantages & Disadvantages of Resistive
 Advantages
◦ Cost-effective solution
◦ Activated by any stylus
◦ Very accurate
◦ Low power requirements
◦ Liquids won't affect touch screen performance
 Disadvantages
◦ Polyester surface can be damaged
◦ Lower endurance (35 million touches)
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9. Surface Acoustic Wave (SAW)Surface Acoustic Wave (SAW)
Surface acoustic wave (SAW) technology uses sound waves that pass
over the touch screen panel. When the panel is touched, a portion of
the wave is absorbed. This change in the ultrasonic waves registers
the position of the touch event and sends this information to
the controller for processing. SAW touch screen technology is
suggested for use
in ATMs,
Amusement Parks,
Gaming Environments,
Industrial Control
Rooms etc.
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10. Advantages & Disadvantages of SAWAdvantages & Disadvantages of SAW
 Advantages
◦ Durable glass construction
◦ High optical clarity
◦ Activated by a finger, gloved hand, or soft tip stylus
 Disadvantages
◦ Moving liquids or condensation can cause false
touches
◦ Solid contaminants create non-touch areas until
removed
◦ Doesn't support drag or draw effectively
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11. CapacitiveCapacitive
A capacitive touch screen panel
consists of an insulator such
as glass, coated with a
transparent conductor such
as indium tin oxide (ITO). As the
human body is also a conductor,
touching the surface of the
screen results in a distortion of
the body's electrostatic field,
measurable as a change
in capacitance.
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12. Advantages & Disadvantages of CapacitiveAdvantages & Disadvantages of Capacitive
 Advantages
◦ Scratch resistant, durable surface
◦ High endurance (225 million touches)
◦ Very accurate
◦ Good optical clarity
◦ Liquids won't affect touch screen performance
 Disadvantages
◦ Does not work with gloved fingers or stylus
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13. InfraredInfrared
An infrared touch screen uses
an array of X-Y
infrared LED and photo
detector pairs around the edges
of the screen to detect a
disruption in the pattern of LED
beams. Infra-red bezels have
proven to be a very reliable
technology for use in
ATMs,Medical Instrumentation
and Transportation Tracking
applications.
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14. Advantages & Disadvantages of InfraredAdvantages & Disadvantages of Infrared
Touch ScreenTouch Screen
 Advantages
-Highest quality of underlying image
-Very high transmittance
-Can be activated with almost any device
-Higher accuracy than other technologies
-Very high durability and reliability
 Disadvantages
- Surface obstructions can cause a false touch
– It is very sensitive and can be activated by stray touches.
– Low resolution
– Parallax problems
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15. Touch Screen Technology Comparison ChartTouch Screen Technology Comparison Chart
Resistive Infrared SAW Capacitive
Touch
Resolution
High High Average High
Clarity Average Good Good Good
Operation Finger or Stylus Finger or Stylus Finger or Soft-
tipped Stylus
Finger only
Durability Can be Damaged
by Sharp Objects
Highly Durable Susceptible to
Dirt and
Moisture
Highly durable
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16. Advantages & Disadvantages of all TouchAdvantages & Disadvantages of all Touch
TechnologyTechnology
Touch screens have several Advantages over other pointing devices:
 A touch screen is easy to use.
 Save space as no buttons are required.
 Touch screens are the fastest pointing devices.
 Touch screens have easier hand eye coordination than buttons.
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17. DisadvantagesDisadvantages
 Screen has to be really big not to miss things when pressing them
with your finger:
 Big screen leads to low battery life.
 Touch screen means screen can’t be read too well in direct sunlight.
 Most user interfaces are not optimized for thumb operation, so a
stylus in necessary, and this means using two hands.
 Screens get very dirty.
 These devices require massive computing power which leads to slow
processing and heating issues.
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18. CONCLUSIONCONCLUSION
Though the touch screen
technology contains some
limitations still it is very
user friendly, fast, accurate,
easy for the user & fun to
operate. It has been widely
accepted. And now by just
modifying a little it can
replace the mouse and
keyboard completely in near
future.
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19. ReferenceReference
https://www.google.com/webhp?source=sear
https://engineershub.co/
https://office.live.com/start/PowerPoint.aspx
https://www.google.com/imghp?hl=en
https://en.wikipedia.org/wiki/Touchscreen
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20. THANK YOU
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