What is Touchscreen ?

A touchscreen is an electronic visual display thatcan detect the presence and location of a touch

within the display area.

History

• The Fairlight CMI was published as a light pen which the user could allocate and manipulate sample and synthesis data, as well as access different menus within its OS by touching the screen with the light pen.

• A first capacitive touch screen was developed by American

inventor G Samuel Hurst and the first version produced in

1982

• In 1983, the first touchscreen computer is published named HP-150

• IBM Simon is the first phone with touch screen (1992)

• The Game.com is the first handheld game console with touch screen and stylus in 1997

Advantages

• The input device is also the output device

• Reduces buttons and menus, making user interface simpler

• Fast command selection (compared to a mouse)

• Improved flexibility for customization and upgrades

• Easier cleaning and maintenance

Disadvantages

• The user must sit within arm’s reach of the display

• Difficult to select small items

• Possible retrofit problem (the touch screen must be fitted on the screen)

TechnologiesResistive

Resistive touch screen panels are using When pressure is applied to the screen, by a finger or other objects, the layers are brought into electrical contact which causes a switch closure and a command is

registered.

Capacitive

These screens are coated with those stores electrical charges. When the panel is touched, a charge is created and that specific

information is sent to be processed. Unlike its resistive counterpart, capacitive touch screens must be touched by a human finger or

some sort of conductive device being held by a human hand.

Surface Acoustic Wave (SAW)This type of touch screen is glass with a string of transducers and

reflectors and registers touches using acoustic waves. When touched, the wave is absorbed and the touch is registered and sent

to be processed. Since the panel is made of all glass the clarity is superior to the other touch screen types.

HCI IssuesThere are some important points in design of touch screen interfaces.

Normally, we don’t consider these things, but these little interactions are so essantial to give right response by brian.

• Response speed should be of utmost importance. The speed and ease with which a human can interact is increased within the touch screen interface environment.

• More space comes in at a close second to speed. All buttons (especially keyboards) or object in interface should design for fat fingers that helps to think worst and have to have enough space between items.

• Intuitiveness of your design also becomes a heightened concern.In the touch screen environment non-intuitive information architecture will be even more frustrating to your users, when simple action does not deliver as expected.

• Bright background colors or patterns can hide glare and reduce fingerprints. Solid black is the worst possible choice.

• Flyout or rollover menus become much less useful. You may want to consider placing navigation at the bottom of your touch screen area, with results/display at the top.

Future of the Touch Screens

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