Method one, using small dots to lock the screen
1. Open the virtual key of the iphone iphone5s How to open the Virtual home button (IOS7)
2. If we see a "device" on the Apple phone screen
4. After the lock screen, and then light the screen, test screen will automatically black screen, into the lock screen state.
method Two, shutdown and then boot
1. The smartphone may be used for a long time will have this problem, we put the phone at the top of the power supply button, activate the shutdown option, sliding slider off.
Method Three, close the software
You also switch other applications at this time and do not minimize to the background to run, exit the application.
Friendly Tips
Smart-phone systems are going to have some of these problems when the phone is restarted and then solved, there is another reason you can open other software is in use, this some software will let the screen is always on, as I used to PPTV in the download of TV is also the case, the software can be turned off to solve.