Apple patent describes a method to prevent your phone from falling display first

Credit: Apple/ übergizmo.

http://www.ubergizmo.com/2013/03/apple-patent-describes-a-method-to-prevent-your-phone-from-falling-display-first/

While this would provide a degree of protection for the display, other parts of the phone would suffer anyway.  May be better to try something from Otterbox:

http://www.otterbox.com/ / phone mobile cell impact drop resistance centre center of gravity shift move drop land lands crunching cracking sound glass falling shift center of mass gravity sensor sensors gyroscopes accelerometers GPS imaging detect fall is taking place statistics falls height time to impact speed of the fall can be stored in the phone, allowing the system to compute the best solution in the event you drop your phone weighted mass lift foils extend from the device thrust mechanism /