Play lot of games on Android devices through MHL / HDMI mirroring on TV? I have a free Android application that you should try ~ Screen Standby by nkaHnt. Screen Standby switches off the screen temporarily without actually putting the phone into sleep mode. The phone is still running and this saves your battery, avoids heating to prolong battery life. Of course, you still enjoy games and movie on your big TV. Note – root access is required.