The highest resolution supported by the Panasonic PT-DW640 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 projectors that came out around the same time as the PT-DW640. 640 x 480 (VGA) is also supported by this data projector. This multimedia projector also supports a graphics resolution of 1280 x 800 (WXGA).
A 1920 x 1200 (WUXGA) graphics resolution is actually the best supported resolution amongst all data projectors that were launched around the same time as the PT-DW640.
Amongst similar types of data projector the worst supported resolution is 640 x 480 (VGA).