touch screen sensor final

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TOUCH SCREEN TECHNOLOGY

PRESENTED BY

ASHOK KUMAR PANIGRAHI

0811015101


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CONTENTS

HOW DOES IT WORK

DIFFERENT TECHNOLOGIES

WORKING

CHARACTERISTICS

CONTROLLER

SOFTWARE DRIVERS

CONCLUSION

REFERENCES

A VIDEO


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A basic touchscreen has three main components:

1 Touch sensor;

2 Controller;

3 Software driver.

HOW DOES A TOUCHSCREEN WORK?


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TOUCHSCREEN TECHNOLOGY

Resistive touchscreen

Capacitive touchscreen

Infrared touchscreen

Surface acoustic wave (SAW) touchscreen

Strain gauge touchscreen

Optical imaging touchscreen

Dispersive signal technology touchscreen


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RESISTIVE TOUCHSCREEN

Structure

Resistive touch screensconsist of a glass or acrylic

panel that is coated with

electrically conductive and

resistive layers made with

indium tin oxide (ITO) .The

thin layers are separated by

invisible spacers.


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RESISTIVE TOUCHSCREEN Characters:

1. Cost effective solutions

2. Activated by a stylus, a finger or glovedhand

3. Not affected by dirt, dust, water, or light

4. 75%~85% clarify

5. resistive layers can be damaged by a verysharp object


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INFRARED TOUCHSCREEN

Infrared (IR) technology relies on the interruption of an IR lightgrid in front of the display screen. The touch frame contains arow of IR-light emitting diode (LEDs) and photo transistors, eachmounted on two opposite sides to create a grid of invisible

infrared light.

The IR controller sequentially pulses the LEDs to create a gridof IR light beams. When a stylus, such as a finger, enters thegrid, it obstructs the beams. One or more photo transistors fromeach axis detect the absence of light and transmit signals that

identifies the x and y coordinates.


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Characters:

1. Clear as glass, improves reading ability

2. Most durable surface


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MULTI-TOUCH TECHNOLOGY


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CAPACITIVE TOUCHSCREEN

Characters:

1. Durable and resistant to scratches for demanding

applications2. Faster and more responsive

3. Immune to surface contaminants

4. Superior optical clarity, brighter display and lesssurface reflection


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SAW TOUCHSCREEN


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SAW TOUCHSCREEN

Characters:

1. Durable glass construction

2. High optical clarity

3. Activated by a finger, gloved hand or soft tip

4. Not completely sealable, can be affected by large amounts of

dirt, dust, and / or water in the environment


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CONTROLLER

The controller connects between the touch sensor and the PC. It

takes information from the touch sensor and translates it into

information that PC can understand. The controller determines

what type of interface/connection you will need on the PC.

Controllers are available that can connect to a Serial/COM port

(PC) or to a USB port. Specialized controllers are also available

that work with DVD players and other devices.


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SOFTWARE DRIVER

MT 7.13

UPPD

3M MICROTOUCH

MICROTOUCH M


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CONCLUSIONThis paper presents the importance, history, different

technologies and different aspects in using the touch screens.

Although touch screens provide a natural interface forcomputer novices, they are unsatisfactory for most

applications because the finger is such a relatively large

object.


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REFERENCES [1] Bent STUMPE (1978), Experiments to find manufacturing process for an x-y touch

screen, CERN.

[2] Bent STUMPE A new principle for x-y touch system CERN.

[3] Beyers, Tim "Innovation Series: Touch screen Technology".

[4] Frank BECK & Bent STUMPE (24 May 1973), Two devices for operator interaction

in the central control of the new CERN accelerator, CERN.

[5] Holsinger, Erik. (1994) How Multimedia Works. Emeryville, CA: Ziff-Davis

Press[6] Keuling, Christopher "Touchscreens Press Deep Into Consumer

Electronics". ECN Magazine.

[7] Larry K. Baxter (1996). Capacitive Sensors. John Wiley and Sons.

[8] Lunney, Kellie. (February 24, 2000). Texans get touchscreen access to

government.

[9] Mayhew, D. J. (1992). Principles and guidelines in software user interface

design. Englewood Cliffs: Prentice Hall.


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