touchsreen technology

7/30/2019 Touchsreen Technology

1/17

Submitted By:

Vijay KumarVarinder

Singh

KulwinderKaur

Jaspreet

Kaur

Capacitive & Resistive

Touchscreen


2/17

Content Introduction

History

How Does a Touch screen Work?

Use of Touch screen

Touch screen technologies

Working of various touch screen

Advantages & Disadvantages Comparing Touch Technologies

Conclusion.


3/17

IntroductionA touch screen is an electronic

visual display that can detect the

presence and location of a touch

within the display area. The termgenerally refers to touching the

display of the device with a finger or

hand. Touch screens can also

sense other passive objects, suchas a stylus.

In other words, a touch screen is

any monitor, based either on LCD

(Liquid Crystal Display) or CRT

(Cathode Ray Tube) technology

that accepts direct onscreen input.


4/17

History Touch screen technology first

entered the public eye in 1971,

with the invention of the

Elograph, by Elographics, Inc.This company was created to

produce Graphical Data Digitizers

for use in research and industrial

applications. . One of the next devices to be

invented was the HP-150, the first

touch screen computer. Hewlett

Packard invented this device in

1983.


5/17

How does a touch

screen work? Touch sensor

Controller

Software driver


6/17

Use of touch screen Public Information Displays

Retail and Restaurant Systems

Customer Self-Service Control and Automation Systems

Computer Based Training

Assistive Technology

And many more uses.


7/17

Touch screen TechnologyCapacitive

Surface

Projected

Resistive

4 Wire

5 Wire


8/17

Working of various touch

screenResistive

4 -Wire Resistive Touch screen

Technology


9/17

Cont. 5-Wire Resistive Touch screen

Technology


10/17

Advantages of

Resistive touch screen Low production cost

High resistance to dust and water

Best used with a finger, gloved hand

or stylus

Best suited for handwriting

recognition


11/17

Disadvantages of Resistive

touch screen

Not too sensitive, you have to press

down harder

Poor contrast because of havingadditional reflections from extra

layer of material placed over the

screen

Does not support multi-touch


12/17

Capacitive touch screenSurface capacitive technology

Projected capacitive technology


13/17

Advantages of Capacitive

touch screen Because capacitive touch screen

has glass layer instead of plastic, it

looks brighter and sharper

Highly touch sensititive and doesnt

need a stylus

Supports multi-touch


14/17

Disadvantages of Capacitive

touch-screen Because the technology is

dependent on the conductive nature

of human body, it doesnt work if the

user is wearing gloves Because of having a complex

structure, these are quite expensive

Glass is more prone to breaking


15/17

Comparing Touch

Technologies Technology

Transparency

Input Method Response time

Multiple Events Support

Monitor Options

Stability

Cost


16/17

Cont. Durability

Drag and Drop

Size Constraints

Sensor Substrate

Sensitivity


17/17

Conclusion There are many choices in todays

market for one to select the right

touch screen technology and each

technology has its own advantageand disadvantages. The choice of

technology depends on the intended

application or design; whether it is a

small size portable application or alarge size home entertainment

device to high end medical/industrial

applications. The correct choice of

Touch screen technology will help

enhance the human machineinterface experience.

touchsreen technology

Documents