1 / 26

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.

thelma
Télécharger la présentation

TOUCH SCREEN TECHNOLOGY

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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?

More Related