The PJD6353s has a maximum resolution of XGA (1024x768). That's 62% less resolution than the most frequently found native projector resolution of 1080p (1920x1080).
This multimedia projector's resolution (XGA (1024x768)) is in fact the worst resolution amongst all projectors of a comparable age and spec to the PJD6353s.
The best resolution amongst similar types of multimedia projector is 1080p (1920x1080).
If the resolution of this Viewsonic multimedia projector is too low for you then you might want to consider the Optoma GT760 (£449.99) (WXGA (1280x800 and cheaper) and cheaper); or the Infocus IN1142 (£336.99) (WXGA (1280x800 and higher rated) and higher rated).