FIG. 1 is an isometric view a digital projector; FIG. 2 is a front elevation view thereof; FIG. 3 is a rear elevation view thereof; FIG. 4 is a top plan view thereof; FIG. 5 is a left side elevation view thereof; FIG. 6 is a right side elevation view thereof; and, FIG. 7 is a bottom plan view thereof. The broken lines are shown to illustrate the environment only and form no part of the claimed design.