Abstract of Disclosure The
rear projection television of the present invention comprises an optical
assembly; an optical engine disposed on the lower supporting base of the optical
assembly; a hood member coupled to an end of the supporting base at the front end of the optical engine; an inlet disposed on the hood member, the inlet having an elastic sealed cover which allows the
projection lens of the optical engine to be extended inside the hood member and closely wraps the external
diameter of the
projection lens; a first mirror disposed in front of the
projection lens; a second mirroris disposed on the upper end of the inner side of the hood member along the
optical path of the small reflective projection lens. A screen is coupled to the outlet of the hood member along the
optical reflection path of the second mirror. Covering the components one by one by means of a hood member and a screen according to the size of the
optical path and excluding the optical engine of the heat-generating element outside constitute a sealed space with an isolation of air from the exterior for preventing the external dust,
moisture, and temperature. Thus, such arrangement constitutes an optical
assembly of the present invention.