| 摘要 |
PURPOSE:To obtain the maximum condensing effect and improve the utilization efficiency of the illumination light by forming many spherical projections faced to liquid crystal opening windows on the surface of a transparent substrate, and setting various numerals to satisfy the preset conditional expression. CONSTITUTION:Many spherical projections 6 faced to liquid crystal opening windows 7 are formed on the surface of a transparent substrate 1 as a lens array to satisfy the expression I, where (t) is the thickness of the transparent substrate 1, n0 is the refraction factor of the transparent substrate 1, (r) is the radius of curvature of the projection 6, and n1 is the refraction factor of the projection 6. The illumination light is condensed to the liquid crystal opening windows 7 of a liquid crystal panel by the spherical projections 6, and the utilization efficiency of the illumination light can be improved. |
