Projektoroptiksystem und dieses verwendender Projektorfernseher

A projection optical system and a projection television employing the same are provided. The projection optical system includes a lens module and an electron beam tube optical module. The lens module includes a plastic power lens and a hybrid lens. The hybrid lens includes a spherical, biconvex, glass lens and an aspheric lens layer formed on at least one face of the spherical lens. The electron beam tube optical module includes a C-shaped aberration correction device, a window, and a coolant disposed between the window and the aberration correction device. Accordingly, the projection television can provide high quality pictures. In addition, it is possible to reduce the manufacturing costs of the projection television.