Touchscreen

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1 TOUCHSCREEN TECHNOLOGY

OVERVIEW:

OVERVIEW 2 INTRODUCTION TO THE TECHNOLOGY HISTORY HOW IT WORKS ? TOUCH SCREEN DIVERSITY CONTROLERS USED APPLICATIONS CONCLUSION

INTRODUCING THE TECHNOLOGY :

3 INTRODUCING THE TECHNOLOGY A touch screen is an input device or a display that can detect the presence and location of a touch within the display area. The display screen has a sensitive glass overlay placed on it and we could give the desired input by touching it.

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The touch screen has two main attributes: Enables to interact with what is displayed on screen. No intermediate devices required. 4

HISTORY:

HISTORY Emerged in the second half of the 1960s . The First touch screen was developed by E.A.Johnson . Sam Hurst-founder of Elographics . 5

HOW DOES A TOUCHSCREEN WORK?:

6 HOW DOES A TOUCHSCREEN WORK? Main touch screen components: Touch sensor Controller Software driver

TOUCH SENSOR:

7 TOUCH SENSOR A touch screen sensor is a clear glass panel with a touch responsive surface which is placed over a display screen so that the responsive area of the panel covers the viewable area of the 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

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8

CONTROLLER:

9 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.

SOFTWARE DRIVER:

10 SOFTWARE DRIVER The driver is a software that allows the touch screen and computer to work together. Most touch screen drivers today are a mouse-emulation type driver. This makes touching the screen the same as clicking your mouse at the same location on the screen.

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11

TOUCH SCREEN DIVERSITY:

12 TOUCH SCREEN DIVERSITY Resistive Touch screen Surface wave Touch screen Capacitive Touch screen *Surface capacitive *Projected capacitive Near Field Imaging Touch screen Infrared Touch screen

RESISTIVE TOUCH SCREEN:

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

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14

VS20UA CONTROLLER:

15 VS20UA CONTROLLER Supply Voltage 5.0V  DC Maximum Current 20mA Resolution 12-bit

ADVANTAGES:

ADVANTAGES Cost Effective Long life Durable & Consistent No limitation to operate screen with special object. 16

DISADVANTAGES:

DISADVANTAGES Only 75% optical transparency Vulnerability of being damaged by sharp objects 17

SURFACE WAVE TECHNOLOGY:

18 SURFACE WAVE TECHNOLOGY

SAW(continued):

SAW(continued) 19

ADVANTAGES:

ADVANTAGES Superior image clarity Highest resolution & durability factor Touch response time is high. Scratch resistant glass panel 20

DISADVANTAGES:

DISADVANTAGES Needs only fingers or gloved hands for activation. Damaged by outside elements and contaminants. Moderately expensive. 21

2701RSU CONTROLLER:

22 2701RSU CONTROLLER Voltage +5 VDC Baud Rate 9600 (default) and 19200 Touch Resolution 12bit, size independent Conversion Time 10 ms per coordinate set

CAPACITIVE TOUCH SCREENS Surface Capacitive:

23 CAPACITIVE TOUCH SCREENS Surface Capacitive

Projected Capacitive Touch screen:

24 Projected Capacitive Touch screen

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25

5000 RSU SERIAL CONTROLLER:

26 5000 RSU SERIAL CONTROLLER Supply Voltage : +5 V DC or +12V Baud Rate 9600 (default) and 19200 Touch Resolution 12bit, size independent. Conversion Time Approximately 15 ms per coordinate set

ADVANTAGES:

ADVANTAGES More efficient than resistive High touch resolution High clarity display 27

DISADVANTAGES:

DISADVANTAGES Respond to only conductive materials Expensive Capacitive stylus must be used 28

Comparison of touch screen technologies:

Comparison of touch screen technologies Technology Resistive SAW Infrared Capacitive Durability: 5 years 5 years 3 years 2 years Stability: High Higher High Ok Transparency: Ok Good Good Ok Touch: Anything Finger/ pen Sharp Conductive Response time: <10ms 10ms <20ms <15ms

PROS AND CONS:

PROS AND CONS User friendly. Fast response. Error free input. Easy to install. Use finger, fingernail, gloved hand, stylus or any soft-tip pointer to operate. Easy to clean and maintain. 30

Continued…:

Continued… Compatible with Windows, Macintosh and Linux. Does not interfere mouse and keyboard function. Make computing easy, powerful and fun. 31

CONS….:

CONS…. Finger stress Finger prints Screen is covered more by using hand. User has to sit closer to the screen 32

APPLICATIONS..:

33 APPLICATIONS.. Public Information Displays. Retail and Restaurant Systems . Customer Self-Service. Control and Automation Systems. Computer Based Training.

CONCLUSION:

34 CONCLUSION Though the touch screen technology contains some limitations it’s very user friendly, fast, accurate, easy for the novices & fun to operate. And now by just modifying a little it can replace the mouse and key board completely in near future.

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35 THANK YOU

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