| 摘要 |
PURPOSE:To obtain the light radiation pattern meeting the angle of field of a liquid crystal display device by arraying and disposing very small columnar lens-shaped curved surfaces or ellipse lens-shaped curved surfaces on one or both surfaces of a transparent film, thereby forming the light orientation control element. CONSTITUTION:This surface illumination device is used for the back illumination of the liquid crystal display device. A reflector 16 is provided around a light source 15 disposed adjacently to a light transmission plate 13. Scattering patterns 20 and a reflection plate 14 are provided on the rear side of the light transmission plate 13. A diffusion plate 12 and the light orientation control element 11 are disposed on the front side of the light transmission plate 13. The light orientation control element 11 is constituted by forming the many very small columnar lens-shaped curved surfaces 2 on the transparent film 1 and the columnar lens-shaped curved surfaces 2 are arrayed by directing the surfaces toward the direction X within the plane of the film 1. A resin film consisting or polycarbonate, PMMA, PET, etc., is used for the film 1. The columnar lens-shaped curved surfaces 2 are formed at the time of extrusion working of the film or compression working. |
