Download - Touch Screen Technologies
Touch Screens technologies
Mohammed AL-Shirif
Eng. Mohedeen Awad
Outlines:
1. Introduction.
2. Types of the touch screen.
3. Resistive technology
4. Capacitive Technology.
5. SAW technology.
6. Infrared Technology
7. Market Trends
8. What is next?
1. Introduction:
Intuitive
Input/output Devices.
No skills are required.
No additional hardware.
Sensor+controller+software
2. Types of the touch screens:
4 main types.
No type is always the Best.
3.Resistive Technology:
Pressure sensitive.
voltage travel across 2 sheets.
X-sheet and Y-sheet.
isolating dots.
touch is a switch closing the circuit
3. Resistive >> Pros & Cons:
Low Cost
Finger or any stylus.
Low Durability.
Low Clarity (75%).
4. Capacitive Technology:
Rely on electricity of your body.
X-Electrodes & Y-Electrodes
grid of Capacitors is formed.
Your body is a capacitor.
Touch is a change in
capacitance.
4. Capacitive >> Pros & Cons:
Multi-Touch
Good clarity (90%)
Low scratch immunity.
Only Finger.
COMMERCIAL MARKET: The iPhone
5. SAW Technology:
uses ultrasonic waves.
4 transducers (converter).
Electrical / Ultrasonic.
comparing with a
Stored reference signal
Touch is a wave
attenuation
5. SAW >> Pros & Cons:
High clarity (99%)
High scratch immunity
Low weather immunity
can be activated inadvertently by dirt
6. Infrared Technology:
based on light-beam interruption.
a frame surrounds the display
X-LEDs and Y-LEDs.
Photo sensor for X and Y
6. Infrared >> Pros & Cons:
Excellent clarity
Very durable.
suitable for large-sizes
Very expensive.
Low performance in sunlight.
7. Market Trends: 2013
Resistive is shrinking
1.75 billion units in 2013.
Up 17.2% on year.
40% of mobile phones use
hhhhhh touchscreens
The leading technology is
kkk projected capacitive
7. Market Trends >>
Fast growth
8. What is next?
The market will double by 2017
Next market is touch
Large displays.
Touch screen projector
