The highest resolution supported by the PT-LX270 is 1600 x 1200 (UXGA). That's over six times the resolution of a 640 x 480 (VGA) projector, which is the most common resolution supported by multimedia projectors that were launched around the same time as the PT-LX270. 640 x 480 (VGA) is also supported by this data projector.
This data projector's resolution (1600 x 1200 (UXGA)) is actually the best supported resolution across all 4000:1 contrast ratio multimedia projectors that have been available for around the same time as the PT-LX270.
A 640 x 480 (VGA) supported graphics resolutions is the worst supported resolution across comparable types of data projector.