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TOUCH SCREEN TECHNOLOGY

TOUCH SCREEN TECHNOLOGY. Subrat kumar Moharana Regd. No:-0711016018 ENTC-A. TALK FLOW. INTRODUCTION HISTORY FUNCTIONS WORKING TOUCH SCREEN TECHNOLOGY APPLICATION CONCLUSION. INTRODUCTION.

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TOUCH SCREEN TECHNOLOGY

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  1. TOUCH SCREEN TECHNOLOGY SubratkumarMoharana Regd. No:-0711016018 ENTC-A

  2. TALK FLOW • INTRODUCTION • HISTORY • FUNCTIONS • WORKING • TOUCH SCREEN TECHNOLOGY • APPLICATION • CONCLUSION

  3. INTRODUCTION • A touch screen is a computer display screen that is sensitive to human touch, allowing a user to interact with the computer by touching pictures or words on the screen. • A touch screen is an input device that allows users to operate a PC by simply touchingthe display screen which has a sensitive glass overlay placed on it . • A touch screen accepts direct onscreeninputs.

  4. HISTORY • In 1971, the first "touch sensor" was developed by Doctor Sam Hurst (founder of Elographics) while he was an instructor at the University of Kentucky. • The University of Kentucky Research Foundation named it as “Elograph”. • The "Elograph" was not transparent like modern touch screens. • In 1974, the first true touch screen incorporating a transparent surface came.

  5. HOW DOES A TOUCHSCREEN WORK? A basic touch screen has three main components: • touch sensor • controller • software driver

  6. 1.TOUCH SENSOR • A touch screen sensor is a clear glass panel with a touch responsive surface which is placed over a display screen. • The sensor generally has an electrical current or signal going through it and touching the screen causes a voltage or signal change. This voltage change is used to determine the location of the touch to the screen.

  7. 2.CONTROLLER • The controller is a small PC card that connects between the touch sensor and the PC. • It takes information from the touch sensor and translates it into information that PC can understand.

  8. 3.SOFTWARE DRIVER • The driver is a software that allows the touch screen and computer to work together. • It tells the operating system how to interpret the touch event information that is sent from the controller. • Most touch screen drivers today are mouse-emulation type drivers. This makes touching the screen the same as clicking your mouse at the same location on the screen.

  9. DIFFERENT TOUCH SCREEN TECHNOLOGIES • RESISTIVE • CAPACITIVE • SURFACE WAVE • INFRARED • DISPERSIVE SIGNAL TECHNOLOGY

  10. RESISTIVE TOUCH SCREEN TECHNOLOGY • Polyester Film . • Top Resistive Layer. • Conductive Transparent Metal Coating. • Bottom Resistive Layer . • Insulating Dots . • Glass Substrate

  11. Contd. • Pressing the flexible top sheet creates electrical contact with the coating on the glass. • The touch screen controller gets the alternating voltages between the two layers and converts them into the digital X and Y coordinates of the activated area.

  12. Working of touch screen in an integrated circuit

  13. In case of measurement of X coordinate ,the top sheet caries a voltage gradient generated by applying a voltage between the electrodes of top sheet .the bottom sheet serve as a slider in a linear potentiometer .The X co-ordinate is estimated considering the equivalent resistance between the touch point to each linear electrode in top sheet.

  14. Internal Structure

  15. Implementation X1=k(Vrtl+Vrtr+Voffset) X2=k(Vrtl+Voffset) X3=k Voffset The x-coordinate is calaulated from: X=(X2-X3)/(X1-X3) similarly; Y=(Y2-Y1)/(Y1-Y3)

  16. Equivalent Resistance

  17. Block diagram

  18. Advantages of Resistive Technology • Can be activated with any device • Low cost solution • Low power consumption

  19. Disadvantages of Resistive Technology • Poor durability • Lower resolution • Less Accuracy

  20. APPLICATIONS • Public Information Displays tourism displays, trade show displays • Customer Self-Service stores, restaurants, transportation hubs, ATM and airline e-ticket terminals. • And many more uses... computerized gaming, student registration systems, multimedia software, financial and scientific applications, and more.

  21. CONCLUSION • Touchscreens, touch panels or touchscreen panels are display overlays which have the ability to display and receive information on the same screen. • Touchscreens also have assisted in recent changes in the PDAs, making these devices more usable.

  22. REFERENCES • [ 11 Sandbach, David Lee: Position detector constructed from fabric, European patent EP 0989509A2 • [2] Microtouch Systems, Inc.: Frontally Shielded Capacitive touch sensor system, United States Patent US5457289 • [3] Summagraphics Corporation: Method and apparatus for calibration of a charge ratio digitizer, United States Patent US483 1566 • [4] Microtouch Systems, Inc.: Touchscreen controller with pen andor finger inputs, United States Patent US5457289 • [5] Peptek, Incorporated: Touch panel system and Method, United states Patent US4353552

  23. THANK U QUESTIONS?

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