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Touchscreen technology


Published on

comparative study of various types of touch screen technology

Published in: Technology, Health & Medicine

Touchscreen technology

  1. 1. HOW TOUCH TECHNOLOGY DIFFERS FROM OTHER DEVICES • No special commands to learn. • The user doesn’t need to look away from the screen to a keyboard and back again. • Entering wrong information is impossible, only valid options are offered on the screen. • There are no loose pieces of hardware to be damaged or lost.
  2. 2. The Basic Touchscreen Components
  3. 3. TOUCH SENSOR >>The touch sensor is a clear glass panel with a touch responsive area and it is placed over the display screen. >>It allows the electric current and signal to pass through it and change in these signal is used to detect the location of touch on the screen.
  4. 4. Controller >>The controller connects between the touch sensor and the PC. >>Take information from the touch sensor and translate it into the information that PC can understand.
  5. 5. Software Driver The driver allows the touch screen and the computer to work together It tells the computer's operating system how to interpret the touch event information that is sent from the controller. This makes touching the screen the same as clicking your mouse at the same location on the screen.
  8. 8. TYPES OF RESISTIVE TOUCHSCREEN 4 Wire Resistive 5 Wire Resistive
  9. 9. CHARACTERISTICS Cost effective solutions. 75% clarity Activated by a stylus, a finger or a gloved hand. Not affected by dirt , dust , water and light. Resistive layers can be damaged by a very sharp objects. Multi touch capabilities are not there.
  10. 10. CAPACITIVE TOUCH SCREEN • It consists of a glass panel with a capacitive (charge storing) material coating its surface. • Touching the surface of the screen results in a distortion of the screen’s electostatic field,measurable as a change in the capacitance.
  11. 11. TYPES OF CAPACITIVE TOUCHSCREEN Surface Capacitive Projected Capacitive
  12. 12. CHARACTERISTICS High touch resolution High clarity Durable and resistant to scratches for demanding applications. Faster and more responsive. Immune to surface contaminants. Must be touched by fingers, will not work with any non conductive input. Multi touch capabilities are there.
  13. 13. Comparison of Resistive and Capacitive Resistive Touchscreen Capacitive Touchscreen Visibility in indoor: Very Good Very Good Visibility in sunlight: Not very Good Good Touch sensitivity: Light Pressure is needed. Touch screen can respond with fingers (even with gloves on), fingernails, stylus, etc. Responds very well even with the slightest contact of your finger .Doesn't work with gloved fingers/stylus. Accuracy: Accurate to at least display pixel resolution, as can be seen when drawing (or writing characters) with a stylus. Useful for handwriting recognition . Accurate to within a few pixels, in theory, but seriously limited by the physical size of your fingertips, which make it hard to accurately press any control element. Cost: Affordable More expensive than resistive Multi-touch: No Yes Screen Durability: Vulnerable to scratches is more resistant to casual scratches.
  14. 14. Fast response Error free input Use finger , fingernail , gloved hands , stylus or any soft tip pointer Easy to clean Does not interfere mouse and keyboard Make computing easy , powerful and fun It benefits children Fingerprints Finger stress Screen has to be really big not to miss things when pressing them with your finger big screen leads to low battery life touch screen means screen can’t be read too well in direct sunlight Fatigue
  15. 15. Applications Industrial and Medical instrument ation
  16. 16. CONCLUSION • Designers are trying to use touchscreen to simplify input commands for largely unsophisticated computer users. • Today, a larger share of population is PC literate, yet the touchscreen has become adopted by computer 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 touchscreens.
  17. 17. FUTURE SCOPE RPO’ s Digital Waveguide Touch: • Minimal power requirements. • High inherent accuracy & precession. • Zero-pressure touch & allows finger scrolling. • Allows100% display light output, picture definition and colour clarity. • Low-cost & Excellent durability. 3-dimensional Touchscreens
  18. 18. Thank you Any QUERIES……????