The DU978-WT has a maximum resolution of WUXGA (1920x1200). That's 11% more resolution than a 1080p (1920x1080) projector, which is the most common resolution.
This projector's resolution (WUXGA (1920x1200)) is actually the best resolution amongst all projectors of this age and type.
Amongst comparable types of projector the worst resolution is SVGA (800x600).
What does "projector native resolution" mean?