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Touch screens

Everything is copy-pasted...

Jonathan Koruga

on 13 September 2014

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Transcript of Touch screens

There are three basic methods that allow detection. These are;
Resistive: Quite simply, there is a glass screen and another material held away from the screen. Touching causes the two materials to meet, changing electrical current.
Capacitive: There is a layer of capacitors above the screen, with each location storing charge. Touching the location will alter the charges.
Surface acoustic wave: Waves are sent across the screen. Reflectors on the edge can tell disruption.
Possible problem...?
With such a delicate piece of technology, there are an array of problems associated with touch screens, and these can cause the touch screen to be difficult and/or impossible to use.

There are two types of problems that may affect the use of touch screens.
Exterior damage
Technical problems/screen malfunction
Touch screens

What is a touchscreen?
One of the marvels of modern technology, a touchscreen is an device with a screen that can be controlled merely by touch. Examples include Android and iPhone touchscreens. These systems are so popular because they allow otherwise long and boring tasks to be done with speed and relative ease.
What causes the problem?
Robbie Agaba, Jonathan Koruga, Toby Marlow and Nigel Lin
How does it work?
iPhone Processor Touch Interpretation
The iPhone's processor and software are central to correctly interpreting input from the touch screen. The capacitive material sends raw touch-location data to the iPhone's processor. The processor uses software located in the iPhone's memory to interpret the raw data as commands and gestures.

1. Signals travel from the touch screen to the processor as electrical impulses.
2. The processor uses software to analyze the data and determine the features of each touch. This includes size, shape and location of the affected area on the screen. If necessary, the processor arranges touches with similar features into groups. If you move your finger, the processor calculates the difference between the starting point and ending point of your touch.
3. The processor uses its gesture-interpretation software to determine which gesture you made. It combines your physical movement with information about which application you were using and what the application was doing when you touched the screen.
4. The processor relays your instructions to the program in use. If necessary, it also sends commands to the iPhone's screen and other hardware. If the raw data doesn't match any applicable gestures or commands, the iPhone disregards it as an extraneous touch.
All these steps happen in a nanosecond -- you see changes in the screen based on your input almost instantly. This process allows you to access and use all of the iPhone's applications with your fingers. We'll look at these programs and the iPhone's other features, as well as how the iPhone's cost measures up to its abilities, in more detail in the next section.

Multi-touch System
The iPhone is able to react to multiple touches

This is achieved by arranging the capacitors in a co-ordinate system.

The set of unique signals allow the electronics react to multiple touches.
Cawley, Christian 2013, 5 Tips to resolve your tablet’s touchscreen problems, makeuseof, viewed 14/07/14, <http://www.makeuseof.com/tag/5-tips-to-resolve-your-tablets-touchscreen-problems/>

Westlake, Daniel 2014, Common Touch Screen Failures, eHow, viewed 14/07/14, <http://www.ehow.com/list_6141382_common-touch-screen-failures.html>

Wilson, Tracy V. 2014, How the iPhone works, HowStuffWorks, viewed 14/07/14, <http://electronics.howstuffworks.com/iphone.htm>

Kazmeyer, Milton 2014, Benefits of touch-screen technology, Houston Chronicle, viewed 14/07/14, <http://smallbusiness.chron.com/benefits-touch-screen-technology-54942.html>

McClain, Shaun 2014, How to fix an unresponsive touch screen, iTech Channel, viewed 14/07/14, <http://techchannel.radioshack.com/fix-unresponsive-touchscreen-1269.html>

Wright, James 2014, Common Touch Screen Problems, eHow, viewed 14/07/14, <http://www.ehow.com/about_5652107_common-touch-screen-problems.html>

Johnson, Daniel 2013, Smartphone screen repair: seven DIY fixes, The Telegraph, London, viewed 14/07/14, <http://www.telegraph.co.uk/technology/mobile-phones/10477640/Smartphone-screen-repair-seven-DIY-fixes.html>

Popular Mechanics. 2012. How to Fix a Scratched Touchscreen. [ONLINE] Available at: http://www.popularmechanics.com/technology/how-to/tips/how-to-fix-a-scratched-touchscreen-6643768. [Accessed 15 July 14].

Exterior Damage
Touch screens are delicate and are extremely prone to exterior damage

Exterior damage can be caused by
1. Scratching and damaging
2. Dirt and grease

Damages occur frequently because of mishandling and lack of protection
Screen protectors can prevent material from coming in contact with touch screens
Screen Malfunction/Technical Problems
Sometimes, no matter how much protection one user may place on their touch screen device, they can still be affected by technical problems and can leave one's touch screen unresponsive. This can be a major problem as most modern devices heavily rely on touch screen interfaces and if the touch screen is unresponsive, the user may be unable to use the device at all.

Over time, one's touch screen can be prone to many technical problems like calibration issues or delayed response.
How to fix the problem?
Exterior Damage
First: scratches.
Polishes and waxes, such as Turtle Wax, do not work.
Glass buffing does work, but it's nature, plus the amount of water, means it will likely kill the touchscreen.

Second: Dirt and grease
Oleophobic covering makes using liquid cleaners less advisable
Dry or damp cloths are generally best
Screen Malfunction/Technical Issues
There are three methods that can fix the problem.

1. Restart your phone

2. Reset your phone

3. Restore your phone with iTunes

If this doesn't work, then it is most likely a problem for the Apple support team.
Full transcript