this presentation is helpful to gain basic knowledge on working on touch screens

1. WHAT IS HAPPENING????

3. HOW
TOUCHSCREENS
WORK???

4. THINGS IN DISCUSSION

5. HISTORY OF
TOUCHSCREENS

7. Types of touchscreens
(most commonly used)
1.Resistive
 These screens literally “resist” your
touch; if you press hard enough you can
feel the screen bend slightly.
 This is what makes resistive screens
work – two electrically conductive
layers bending to touch one another.
 Resistive touch screens are durable and consistent, but
they’re harder to read because the multiple layers reflect
more ambient light.

8. Capacitive touch screens
• Capacitive touch screens are constructed from materials like
copper or indium tin oxide that store electrical charges in an
electrostatic grid of tiny wires, each smaller than a human hair.
• There are two main types of capacitive touch screens
1. surface
2. projective.
Surface capacitive uses sensors at the corners and a thin evenly
distributed film across the surface
Projective capacitive uses a grid of rows and columns with a
separate chip for sensing

9. Advanced touch screen technologies
1. Infrared
In infrared touch screen technology, an array of X and Y axis is fitted with pairs of
IR Leds and photo detectors. Photo detectors will detect any image in the pattern
of light emitted by the Leds whenever the user touches the screen.
2. Surface Acoustic wave:
The surface acoustic wave technology contains two transducers placed along X-axis and Y-
axis of the monitor’s glass plate along with some reflectors. When the screen is touched,
the waves are absorbed and a touch is detected at that point. These reflectors reflect all
electrical signals sent from one transducer to another. This technology provides excellent
through put and quality

11. Its question
time

12. Thank you