| 摘要 |
PROBLEM TO BE SOLVED: To allow low-cost production even in multi-product-small-volume production by, manufacturing olefinic thermoplastic resin in an injection and compression molding method using a mold. SOLUTION: An optical sheet 10 which is obtained by manufacturing polypropylene as olefinic thermoplastic resin in an injection and compression molding method is arranged between a liquid crystal panel 9 and a light guide plate 1 to tend light emitted from a protrusion 5 on the light guide plate 1 toward an observer at the liquid crystal panel 9. The optical sheet 10 which is manufactured in the injection and compression molding method can be formed by using a mold at a lower manufacturing cost than a roll, which is inexpensive in many-type and few-lot production. By using polypropylene as olefinic thermoplastic resin with good drawing and transfer properties, the optical sheet 10 is made thinner and well molded. The optical sheet 10, if 1 mm or less thick, is sufficiently usable without marring light transmissivity. |
