Selective photo-curing three-dimensional (3D) printer provided with liquid crystal display (LCD) screen

The invention provides a selective photo-curing three-dimensional (3D) printer provided with a liquid crystal display (LCD) screen. The selective photo-curing 3D printer comprises a light-emitting unit, an imaging unit, a molding unit and a raw material supply and recovery unit, wherein the imaging unit comprises a condensing lens, a Fresnel lens, an upper layer polarizing film, an LCD screen and a lower layer polarizing film; the molding unit comprises a part support plate, a Z-axis movement device, a liquid storage tank and a scraper plate; the raw material supply and recovery unit comprises a raw material tank, a charge pipe and a liquid pump; ultraviolet (UV) light sources are evenly distributed on the Fresnel lens by the condensing lens; the light path is changed by the Fresnel lens, so that the LCD screen is vertically irradiated by the light; under the irradiation of the UV light sources, the blockage of an image transparent area of the LCD screen for the UV light is reduced, so that the UV light is blocked at the area where no image is displayed, and a resin liquid layer between a part support plate and the upper liquid level of resin is cured under the irradiation of the light transmitting the LCD screen. The selective photo-curing 3D printer can be used for manufacturing products with the sizes equal to that of a large LCD screen; surface curing is adopted, so that the forming efficiency is greatly improved.