HOW TOUCH TECHNOLOGY DIFFERS
FROM OTHER DEVICES
• No special commands to learn.
• The user doesn’t need to look away from the
screen to a keyboard and back again.
• Entering wrong information is impossible, only
valid options are offered on the screen.
• There are no loose pieces of hardware to be
damaged or lost.
>>The touch sensor is a clear
glass panel with a touch
responsive area and it is
placed over the display
>>It allows the electric
current and signal to pass
through it and change in
these signal is used to detect
the location of touch on the
>>The controller connects
between the touch sensor and
>>Take information from the
touch sensor and translate it
into the information that PC
The driver allows the touch
screen and the computer to work
It tells the computer's operating
system how to interpret the touch
event information that is sent from
This makes touching the screen
the same as clicking your mouse at
the same location on the screen.
Cost effective solutions.
Activated by a stylus, a finger or a gloved
Not affected by dirt , dust , water and light.
Resistive layers can be damaged by a very
Multi touch capabilities are not there.
CAPACITIVE TOUCH SCREEN
• It consists of a glass panel
with a capacitive (charge
storing) material coating
• Touching the surface of
the screen results in a
distortion of the screen’s
field,measurable as a
change in the capacitance.
TYPES OF CAPACITIVE TOUCHSCREEN
Surface Capacitive Projected Capacitive
High touch resolution
Durable and resistant to scratches for demanding
Faster and more responsive.
Immune to surface contaminants.
Must be touched by fingers, will not work with
any non conductive input.
Multi touch capabilities are there.
Comparison of Resistive and Capacitive
Resistive Touchscreen Capacitive Touchscreen
Visibility in indoor: Very Good Very Good
Visibility in sunlight: Not very Good Good
Touch sensitivity: Light Pressure is needed. Touch
screen can respond with fingers
(even with gloves on), fingernails,
Responds very well even with
the slightest contact of your
finger .Doesn't work with
Accuracy: Accurate to at least display pixel
resolution, as can be seen when
drawing (or writing characters)
with a stylus. Useful for
handwriting recognition .
Accurate to within a few pixels,
in theory, but seriously limited
by the physical size of your
fingertips, which make it hard to
accurately press any control
Cost: Affordable More expensive than resistive
Multi-touch: No Yes
Screen Durability: Vulnerable to scratches is more resistant to casual
Error free input
Use finger , fingernail
, gloved hands , stylus
or any soft tip pointer
Easy to clean
Does not interfere
mouse and keyboard
Make computing easy
, powerful and fun
It benefits children
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
• Designers are trying to use touchscreen to simplify
input commands for largely unsophisticated computer
• Today, a larger share of population is PC literate, yet
the touchscreen has become adopted by computer
users of all abilities because it is simple, fast, and
• In future there is no usage of mouse and keyboards as
they will be replaced by touchscreens.
RPO’ s Digital Waveguide Touch:
• Minimal power requirements.
• High inherent accuracy & precession.
• Zero-pressure touch & allows finger scrolling.
• Allows100% display light output, picture
definition and colour clarity.
• Low-cost & Excellent durability.