The PJ WX6170N supports a maximum resolution of 640 x 480 (VGA). That's 84% less resolution than the most common graphics resolution of 1600 x 1200 (UXGA). In addition, this data projector support a graphics resolution of 1920 x 1080 (HD 1080) and 1280 x 800 (WXGA).
This projector's resolution (640 x 480 (VGA)) is actually the worst supported resolution amongst all similar spec projectors that have been around for a comparable time to the PJ WX6170N.
Amongst similar types of projector the best supported resolution is 4096 x 2160.