One of the iPhone's greatest features is its
highly intuitive touch screen.
Unlike other electronic device touch screens,
your iPhone doesn't operate using the blockage of light to decipher which keys
and commands you're pressing.
This makes it a viable choice for cell phone
users who may not be able to complete other types of commands.
While you cannot alter the sensitivity of your
iPhone, you can toggle certain features that make your phone easier to use.
How It Works
The key to understanding the sensitivity level of your
iPhone's touch screen is first understanding how the touch screen actually
works.
Instead of detecting light blockages or heat to interpret
your finger's movements, the iPhone actually has a grid that lies underneath
the surface of the touch screen.
When your finger touches the screen, electrical impulses
detect the area on the grid that you're touching to interpret the letter,
command or motion you're making to issue the correct response.
Screen Sensitivity
While previous models of the iPhone did offer the ability to
change the screen sensitivity and the speed by which your phone responds to
commands, the iPhones 4 and 4S no longer offer the option.
Instead, the touch sensitivity on newer phones is
automatically calibrated for the fastest speeds, which means your phone
responds quickly to your touch.
If this frustrates you and results in commands and calls you
didn't mean to make, locking the screen by pressing the button on the top
right-hand rim of the phone helps stop unwanted commands.
Assistive Touch
Update iPhones running on iOS 5 with an option known as
"AssistiveTouch," which allows users who may not have complete
control over their bodies and motions to use the iPhone.
This program allows you to change the speed at which the
phone responds to your touch.
By tapping the "General" icon, then touching
"Accessibility" and "AssistiveTouch," you'll enter the
assistive touch menu.
When you turn on the option, an overlay appears on the
screen that allows you to give commands by touch, rather than by shaking,
swiping or pinching the screen.
When setting up AssistiveTouch, you'll have the opportunity
to select your command tracking speed, which deals with how sensitive your
iPhone is to your various gestures and custom commands.
Case Issues
Your touch screen isn't the only place where your phone is
sensitive to movements.
Your iPhone has a feature called a proximity sensor.
The role of the proximity sensor is to sense the closeness
of your face during a phone call. When the phone senses that your face is close
to the phone, it locks your screen to prevent you from accidentally activating
the touch screen with your cheek or ear.
This is handy, except when the proximity sensor is partially
obscured by a case and is no longer sensitive to the position of your face.
The proximity sensor is found on the upper right-hand corner
of your screen, so ensure that it remains uncovered to preserve its
sensitivity.
http://www.gadgetvenue.com/how-the-iphone-touch-screen-works-02223447/
http://www.appleinsider.com/articles/11/07/11/inside_apples_ios_5_assistive_touch_allows_accessible_gesture_commands/
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