Hello,
I'm using two P10 led matrix module and DMD library.
How to clearScreen for one P10 module?
What does the data sheet tell?
Which data sheet? P10 datasheet?
Yes.
Hi,
What library are you using?
Have you looked at the examples that come with it?
Possibly;
dmd.clearScreen( true ); //true is normal (all pixels off), false is negative (all pixels on)
but it depends on the library.
Tom... 
Hi
With command below will cause all display P10 was cleared. If I use two P10 all display 1 and 2 cleared.
dmd.clearScreen( true ); //true is normal (all pixels off), false is negative (all pixels on)
Now I already solve with my way. I just write code below with big font will clear only one P10 panel.
dmd.selectFont(Arial_Black_16);
dmd.drawString( 0, 0, " ", 4, GRAPHICS_NORMAL ); //X,Y,"text",length
If need to clear the other panel to clear just change the X Y coordinate.