The highest resolution supported by the Acer X1340 is 1920 x 1200 (WUXGA). That's over seven times the resolution of a 640 x 480 (VGA) data projector, which is the most common resolution supported by 10000:1 contrast ratio data projectors that have been available for a similar time to the X1340.
A 1920 x 1200 (WUXGA) graphics resolution is in fact the best supported resolution amongst all projectors of this spec and age.
Amongst similar types of data projector the worst supported resolution is 640 x 480 (VGA).
It may also be worth also looking at one of the other projectors that support a resolution of 1920 x 1200 (WUXGA) currently available including because of it's better review score, the Acer P1500.