Shade is used widely for window shade, although blind is common in the Midland U.S. (as well as in Great Britain), and curtain is used chiefly in New England and the South Atlantic states.
Examples from the web for window shade
She wanted to know what new and forbidden thing was happening on the other side of the window shade.
After a moment she turned again in the bed and studied the two thin pencils of light shining in at the edge of the window shade.
She pushed up the window shade and looked out, into featureless darkness.
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In this case, the farm scene was painted on a fabric window shade.
The window shade information is shown for information only.
Contractor shall field verify all window shade sizes.
The identification sign must also be on any window shade, blind, or curtain blocking the rescue window from sight.