The highest resolution supported by the Panasonic T-EW540 is 1920 x 1200 (WUXGA). That's over seven times the resolution of a 640 x 480 (VGA) multimedia projector, which is the most common resolution supported by similar spec projectors that are a comparable age to the T-EW540.
A 1920 x 1200 (WUXGA) graphics resolution is actually the best supported resolution across all data projectors of this age and type.
The worst supported resolution across comparable types of multimedia projector is 640 x 480 (VGA).
Projectors with a higher resolution that might also be worth looking at include the NEC NP-PA500 (1024 x 768 (XGA)|1280 x 1024 (SXGA)|1400 x 1050 (SXGA+)|1600 x 1200 (UXGA)|1920 x 1200 (WUXGA)|640 x 480 (VGA)|800 x 600 (SVGA)) which is also cheaper.