Touch Screen Sensors
Outline
What are touch screen sensors
Different types touch screen sensors
Working principles
Major applications
 Ref...
What are Touch Screen Sensors?
“A Touchscreen is a display which can detect the
location of touches within the display ar...
Types of Touch Screen Sensors
External add on touch screens
Integrated Touch Screen Monitors
External Add On Touch Screen Sensor
Can be added to your home computer
Brings touch screen technology to the common user
Integrated Touch Screens
The sensor system is already integrated into the
screen or monitor
Working Principles
•A clear touch sensor is placed over
the viewable video screen
Working Principles
A controller (2) takes information from the touch
screen (1)
The info is turned into information the ...
Working Principles
Multiple Types of Touch Sensors
Resistive
Surface Acoustic Wave
Capacitive
Infrared
Strain Gage
Resistive
Composed of several layer including two metallic
layers separated from each other
When metallic layers are con...
4-wire resistive touchscreen
Surface Acoustic Wave
•Uses Ultrasonic waves across the surface
•When the screen is touched part of the
wave is absorbed
•...
Capacitive
Coated with a current
conducting material
Sensor has a precisely controlled field of stored
electrons in hori...
Surface-capacitive touchscreen
Structure
Surface capacitive technology consists of a
uniform conductive coating on a glas...
Projected-capacitive touchscreen
During a touch, capacitance forms between the
finger and the sensor grid.The embedded se...
Surface-capacitive touchscreen
Working principle
A human body is an electric conductor, so when you touch the
screen with...
Infrared
An array of infrared sensors are placed horizontally
and vertically
The sensors send out pulses of light
The s...
Strain Gage
http://etestinc.com/db4/00336/etestinc.com/_uimages/str
ainguage.bmp
•Screen is mounted on
four springs one at...
Typical Applications
Consumer Electronics
Phones
Tab
Digital Cameras
GPS
etc
www.trafficdominatetricks.com/jv/prizes....
Typical Applications
ATM
Interactive Kiosks
and learning
stations
Etc. Etc. Etc.
THANKING
YOU
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Touch screen sensors

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Touch screen sensors

  1. 1. Touch Screen Sensors
  2. 2. Outline What are touch screen sensors Different types touch screen sensors Working principles Major applications  References
  3. 3. What are Touch Screen Sensors? “A Touchscreen is a display which can detect the location of touches within the display area. This allows the display to be used as an input device, removing the keyboard and/or the mouse as the primary input device for interacting with the display's content.”
  4. 4. Types of Touch Screen Sensors External add on touch screens Integrated Touch Screen Monitors
  5. 5. External Add On Touch Screen Sensor Can be added to your home computer Brings touch screen technology to the common user
  6. 6. Integrated Touch Screens The sensor system is already integrated into the screen or monitor
  7. 7. Working Principles •A clear touch sensor is placed over the viewable video screen
  8. 8. Working Principles A controller (2) takes information from the touch screen (1) The info is turned into information the computer can understand • A software driver is needed to allow the touch screen and computer to work together (3)
  9. 9. Working Principles Multiple Types of Touch Sensors Resistive Surface Acoustic Wave Capacitive Infrared Strain Gage
  10. 10. Resistive Composed of several layer including two metallic layers separated from each other When metallic layers are connected (touched) they act as like 2 voltage dividers Change in electric current is sent to controller and the location is determined
  11. 11. 4-wire resistive touchscreen
  12. 12. Surface Acoustic Wave •Uses Ultrasonic waves across the surface •When the screen is touched part of the wave is absorbed •This allows the controller to determine the position of the touch
  13. 13. Capacitive Coated with a current conducting material Sensor has a precisely controlled field of stored electrons in horizontal and vertical directions Humans also exhibit capacititance A controller detects when there is a disturbance in the electric field (touch) The controller then determines the location
  14. 14. Surface-capacitive touchscreen Structure Surface capacitive technology consists of a uniform conductive coating on a glass panel. Electrodes around the panel’s edge evenly distribute a low voltage across the conductive layer, creating a uniform electric field.
  15. 15. Projected-capacitive touchscreen During a touch, capacitance forms between the finger and the sensor grid.The embedded serial controller in the touchscreen calculates touch location coordinates and transmits them to the computer for processing.
  16. 16. Surface-capacitive touchscreen Working principle A human body is an electric conductor, so when you touch the screen with a finger, a slight amount of current is drawn, creating a voltage.s Theoretically, the amount of current that drifts through the four electrodes should be proportional to the distance from the touch point to the four corners. The controller precisely calculates the proportion of the current passed through the four electrodes and figures out the X/Y coordinate of a touch point.
  17. 17. Infrared An array of infrared sensors are placed horizontally and vertically The sensors send out pulses of light The sensors detect the interruption of the light The location is then determined by the controller
  18. 18. Strain Gage http://etestinc.com/db4/00336/etestinc.com/_uimages/str ainguage.bmp •Screen is mounted on four springs one at each corner •Deflection of screen when touched is measured by all four strain gages •Calculations are made based on each of the four deflections to determine the location of the touch
  19. 19. Typical Applications Consumer Electronics Phones Tab Digital Cameras GPS etc www.trafficdominatetricks.com/jv/prizes.htm techwoo.com/hp-ipaq-112-classic-pda-phone/
  20. 20. Typical Applications ATM Interactive Kiosks and learning stations Etc. Etc. Etc.
  21. 21. THANKING YOU

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