Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.

Touch screen technology


Published on

Published in: Technology, Business
  • Be the first to comment

  • Be the first to like this

Touch screen technology

  2. 2. INTRODUCTION Most sophisticated computer access technology. Detect the presence and location of a touch. Eliminates the need for the mouse and keyboard.
  3. 3. HISTORYEmerged in the second half of the 1960s.In 1971, Sam Hurst, invented first touch sensorIn 1977 , "touchscreen."
  4. 4. 1) SURFACE ACOUSTIC WAVE: Uses ultrasonic waves. It is based on sending waves across a clear glass panelwith a series of transducers and reflectors.
  5. 5. DisadvantagesTouched by finger, glovedhand, or soft-tip stylus.Not completely sealable.
  6. 6. TECHNOLOGIES2) RESISTIVE: Composed of two thin, metallic, conductive layers. Change in current is registered as touch event.
  7. 7. DISADVANTAGESOffer only 75% clarity.The layer can be damaged.Cannot press hand down on the screen while writing.
  8. 8. 3) CAPACITIVE:Consists of insulator coated with a transparentconductor.Touching results in a distortion of the electrostatic field.
  9. 9. 4) INFRARED:It employs one of two very different methodologies.Use an array of infrared light-emitting diodes.
  10. 10. 5) Strain gauge : The screen is spring-mounted on the four corners. Used to determine deflection when the screen istouched.
  11. 11. 6) Optical imaging: Two or more image sensors are placed around the edges ofthe screen. Revolutionizes the way we interface with computertechnology.
  12. 12. 7) Dispersive signal technology:Chemically-strengthened glass substrate with piezosmounted on each corner.Determines position by pinpointing the source of“bending waves”.
  13. 13. Comparison of touchscreen technologiesTechnology 4-Wire SAW 5-Wire Infrared CapacitiveDurability:5 year 5 Year 3 Year 3 Year 2 YearStability:High Higher High High OkTouch:Anything Finger/Pen Anything Sharp ConductiveResponsetime:<10ms 10ms <15ms <20ms <15msMonitoroption:CRT CRT CRT or LCD CRT or LCD CRT or LCDWaterproof:Good Ok Good Ok Good
  14. 14. CONSTRUCTIONThree main components:1) Touch SensorTouch response surface.It is a clear glass panel.
  15. 15. 2) ControllerInterface between a touch screen sensor and the devicethe sensor is used to control.Determines what type of interface/connection.
  16. 16. 3) SoftwareDriverSoftware update for thePC system.Allows the touchscreenand computer to worktogether.
  17. 17. APPLICATIONS Public Information Displays. Retail and Restaurant Systems . Customer Self-Service. Control and Automation Systems. Computer Based Training. Assistive Technology.
  18. 18. THANK YOU..!!