TOUCH SCREEN TECHNOLOGIES

PRESENTED BY: Deepak kumar

MCA

ABSTRACT The touch screen is an assistive technology.

This interface can be beneficial to those that have difficulty in using other input devices such as a mouse or keyboard.

When used in conjunction with software such as on-screen keyboards, or other assistive technology, they can help make computing resources more available to people that have difficulty in using computers.

Touch screen based system allows an easy navigation around a GUI based environment.

CONTENT INTRODUCTION TYPES OF TOUCH SCREEN COMPONENTS WORKING ADVANTAGES AND DISADVANTAGES APPLICATIONS CONCLUSION

INTRODUCTIONWhat is a Touch Screen?

A touch screen is an Electronic Visual Display that can detect the presence and location of a touch within the display area.

OR A touch screen is an Electronic Visual

Display that responds when it detects a touch on its Surface

EVOLUTION OF TOUCH SCREEN The touch screen was derived from

the digitizing tablet. The digitizing tablet was invented by Sam Hurst in 1971. It was designed to allow scientists to record data from graphs by placing the graph on the tablet and pressing the paper against the tablet with a stylus.

TYPES OF TOUCH SCREEN Resistive touch screen

Capacitive touch screen

Infrared touch screen

Surface acoustic wave (SAW) touch screen

RESISTIVE TOUCH SCREEN

Resistive LCD touch screen monitors rely on touch overlay, which is composed of a flexible top layer and a rigid bottom layer separated by insulating dots, attached to a touch screen controller.

Resistive touch screen panels are generally more affordable but offer only 75% clarity and the layer can be damaged by sharp objects. Resistive touch screen panels are not affected by outside elements such as dust or water.

Resistive Touch ScreenAdvantages:-

Low cost High resistance to dust Best used with finger ,stylus or gloved hand

Disadvantages:- Not too sensitive Poor contrast Doesn’t support multi-touch

Phones:-Samsung Star Duos, Samsung Champ Duos, Spice FLO, Nokia C2-02, LG Cookie Joy

CAPACITIVE TOUCH SCREEN

A capacitive touch screen panel is coated with a material that stores electrical charges. When the panel is touched, a small amount of charge is drawn to the point of contact.

Capacitive touch screens have excellent clarity, and there are no moving parts to wear out. Liquids, dirt, grease, or othercontaminants do not affect them.

Capacitive Touch ScreenAdvantages:- Brighter and Sharper High touch sensitive & doesn’t need stylus Support multi-touch

Disadvantages:- Expensive Glass is more prone to breaking

Nokia Lumia 800, HTC Explorer, Apple iPhone 4S, Spice Mi-310, Samsung Galaxy Note

Phones:-

Resistive touch screen

Capacitive touch screen

image clarity 75% only clarity of up to about 90%

INFRARED TOUCH SCREEN

An infrared touch screen uses an array of X-Y infrared LED and photo detector pairs around the edges of the screen to detect a disruption in the pattern of LED beams.

SAW TOUCH SCREEN

The Surface Acoustic Wave (SAW) technology is one of the most advanced touch screen types. The technology is based on two transducers (transmitting and receiving) placed for the both of X and Y axis on the touch panel.The Surface Acoustic Wave technology is recommended for ATMs, Amusement Parks, Banking and Financial Applications, public information kiosks, computer based training, or other high traffic indoor environments.

COMPONENT1. Touch Sensor2. Controller3. Software Driver

TOUCH SENSORS

Touch sensor

Covering screen

A touch screen sensor is a clear glass panel with a touch responsive surface.

CONTROLLER [RESISTIVE] NAME:

VS20UA CONTROLLER

Supply Voltage 5.0V  DC

Maximum Current  20mA

Resolution 12-bit

CONTROLLER [CAPACITIVE] Name:

5000 RSU SERIAL CONTROLLER

Supply Voltage: +5 V DC or +12V

Touch Resolution 12bit, size

independent.

SOFTWARE DRIVER

The driver is a software update for the PC system that allows the touch screen and computer to work together.

It tells the computer's operating system, How to interpret the touch event information that is sent from the controller.

WORKINGTouch screens are activated by the insertion or

removal of the fingertip or by pressing the controls, active areas or targets with a head stick, or other similar device (stylus).

Resistive touch screens are pressure sensitive, so they can be operated with any input device, including a gloved hand or stylus.

Capacitive touch screens offer higher clarity and are more durable, but they do not respond to gloved hands or most styluses.

Infrared touch screens are based on light-beam interruption technology.

Surface Acoustic Wave (SAW) is a newer technology that uses ultrasonic waves that pass over the screen.

ADVANTAGES Touching a visual display of choices requires

little thinking and is a form of direct manipulation that is easy to learn.

Touch screens are the fastest pointing devices.

Touch screens have easier hand eye coordination than mice or keyboards.

No extra work space is required as with other pointing devices.

DISADVANTAGES User's hand may obscure the screen.

Some reduction in image brightness may occur.

They cost more than alternative devices.

APPLICATIONS Public information displays

Tourism displays Trade show display Awareness kiosks

Customer self service General departmental Stores Restaurants ATM Airline ticket terminals

Other uses Digital jukeboxes Computerized gaming Student Registration systems

THANK YOU