How to clear display?

[rozrabiak]

Hi, after restart cpu display always show last digits.
My setup:

  tmDisplay.begin();  
  tmDisplay.setBrightnessPercent(90);

tmDisplay.clearScreen();

Above set's display to 00.

 tmDisplay.offMode();

Above switch off display's, but when I turned ON again - on displays I have last number's :-(

What I can do to clear registry (buffer) in TM1637 using this library?
I want to have my display without any digits after start program.

Regards!

[rozrabiak]

I need turn ON only colon - as status.

And another question, how to select (I have two displays) which colon turn ON?
Now when:

tmDisplay.colonOn();

Two colons are turned ON :-)