| 摘要 |
PURPOSE:To omit an independent converging Fresnel lens and a reflecting plate by providing substrates where electrodes are formed to the front and rear surfaces of liquid crystal, using a transparent electrode as the electrode on the front surface side and forming the converging Fresnel lens integrally, and forming a reflecting surface on the substrate on the back surface side. CONSTITUTION:When light beams, from a light source 11 are projected on a liquid crystal display plate 9 and electrodes 4 and 5 are selected and impressed with a voltage, dots are formed on liquid crystal to display an image. At this time, a condenser lens 12 diverges the illumination light beams from the light source 11 almost to the contour of the liquid crystal display plate 9. This illumination light beams are converged by the converging Fresnel lens 7 without any waste and projected on the liquid crystal 1, and the light beams are reflected by the electrode 5 and transmitted through the liquid crystal 1 again; and the light beams are converged by the converging Fresnel lens 7 to illuminate almost to the overall diameter of an image forming lens 13, and then projected on a screen 7. Consequently, the reflecting plate need not be provided independently and has its installation position adjusted, and converging Fresnel lens 7 is formed integrally with the transparent substrate 2, so it need not be provided independently and its fitting position need not be adjusted either. |
