Patent ID: 10663840

Abstract:
A projection-type display device, provided with: a reflection-type image display element (DP), in which illumination light is reflected at an image display surface so as to be converted to image light and emitted; a prism unit (PU1) that bends a light path of the illumination light and transmits image light; and a projection lens system (PO) that projects the image light transmitted through the prism unit onto a screen. The prism unit (PU1) has an air gap (AG) that is disposed obliquely with respect to the main light rays of the image light emitted from the center of the image display surface. At least one lens (DL) in the projection lens system (PO) is eccentric in relation to the optical axis of the projection lens system (PO) so that comatic aberration produced when the image light is transmitted through the air gap (AG) will be canceled out.