With this application,if you want to lock screen,you don’t need to press the key physically, just cover the right-top area of your phone.You can also set the cover-times and timeout for your own.
Application – LightLock for Nokia N9/N950 – MeeGo Harmattan mge.bz/CA #fb
— MeeGoExperts (@MeeGoExperts) June 14, 2012
Source Nokia Store