A new study by OptoFidelity for the first put smartphone touchscreens to a test by a robotic hand that touched the display at specific points and then compared what the phone actually registered. Interestingly, iPhones were most accurate in the bottom part of the screen - exactly where the keyboard is located, while in other parts of the display and even around the edges of the keyboard they do not register touch accurately at all.
Green areas show accurate touch registration, red once show deviations.
The moral of the story is simple. Be more careful when you type on the iPhone keyboard, especially around the edges where the Q, O and P buttons are located. Don’t be too surprised if most of the typing mistakes you make occur there! The digression might look tiny - it’s just around 1mm - but let’s not forget that those buttons are not all that large either.
Here are the areas around the edge of the iPhone keyboard that have inaccurate touch response.
Right below is a video demonstration of the equipment used to test the screen accuracy. Have you ever noticed you have trouble hitting those buttons right?
source: OptoFidelity via GSM Arena