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I mean, a "blank page" because then I want that just the module will be shown. Do you get this?
Your English is perfectly clear. It's the "concept" that has me scratching my head.
I do not get this.
I don't think there's anything wrong with our English here, but maybe with our "Joomla". Let me make sure we're using the same definition for some terms -
"module" - applet that displays content in a position other than the main content area (i.e.: top, left, right, bottom, etc., etc.)
"blank page" - I am interpreting this as meaning having nothing in your main content area which is normally controlled by com_content, but can be whichever component you are displaying if it is not com_content.
Now, since you have not specified a component, I assume you are using com_content for your "blank page". And here is where you want only a single module to display? What about your page heading, logo images, site name, etc., etc.?
Either you haven't given me enough information, or we are using different definitions for our terms or I haven't had enough coffee this morning.