Shri Ram Murti Smarak College of Engineering And
PRESENTATION TOPIC :TOUCH SCREEN TECHNOLOGY
MR. ABHISHEK SRIVASTAVA
Points of Discussion
Advantages & Disadvantages
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
objects sensed is active, as with a
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.
Now days, Multipoint touchscreen facilitates the tracking of more
than one finger on the screen.
How Does a Touchscreen Work?
1. Touch Sensor
3. Software Driver
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.
3. 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.
Two layers of conductive material
Touch creates contact between
resistive layers completing circuit
Voltage in circuit changes based on
Controller determines location
based on voltages
Any material can trigger sensors
Uses infrared LEDs and matching
Touching screen interrupts LEDs
Cameras detect reflected LED
caused by touch
Controller able to calculate
coordinates from camera data
Glass panel with conductive layer
(Indium Tin Oxide)
Small amount of voltage applied to
four corners of touch screen
Touch draws minute
amount of current creating voltage
Coordinates of point of contact
calculated by controller
4. Surface acoustic wave:
Surface consists of glass overlay with
transmitting and receiving transducers
Electrical signals sent to the transmitting
transducers converts to ultrasonic waves
Waves are directed across screen by
reflectors then directed to receiving
Received values are compared to stored
digital maps to calculate x and y
Many games use the touchscreens as a primary controlling device.
The popularity of smart phones, ATMs, and many types of
information appliances is driving the demand for touchscreens.
Touchscreens are popular in heavy industry and in other situations,
such as museum displays or room automation.
Casino and other gaming systems
Computer access for the physically disabled
Employee time clocks
► Mostly used in manufacturing and medical applications since it
can be completely sealed.
► Operated using a stylus or a gloved finger.
► Mechanically stronger
► More wear resistant
►It is very sensitive and can be activated by stray touches.
Designers are trying to use touch screen to simplify input
Today , touch screen has becomes adopted by computers users of
all abilities because it is simple, fast and innovative.
In future there is no usage of mouse and keyboards as they will be
replaced by touch screen.