nanoDLP

hi, i solved many problems on this forum, only last ones are left ))

My configuration:

Arduino Mega2560+Ramps 1.4+Raspberry PI 3, optic endstops on top and bottom
Screen 5Inch, resolution 800x480
Marlin 1.1.8
Arduino 1.8.5
Nano DLP - uptodate
=================

When Raspberry Pi 3 starts, there are the log text.
And this text doesnt go away.
When printing started
-Sliced image appears
-Sliced image disappears
-Log text appears
-Sliced image appears

My question is: how to blank the screen and clean that text ?

Thanks