| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical sheet having high light utilization efficiency. SOLUTION: The optical sheet 1 for a backlight is constituted so that a diffusion sheet 4 and a prism sheet 5 are arranged in this order from the side of a light source. Prisms 6 are arranged in parallel on the side of the light emission surface of the prism sheet 5. The light emission surface of the diffusion sheet 4 is stuck to the light entrance surface of the prism sheet 5 while interposing a light reflective layer 7 between them. The light reflective layer 7 is disposed like a stripe perpendicular to the longitudinal direction of each prism 6. As a result, since the light made incident on the stuck portion can be restrained from entering each prism at a large incident angle, light beams can be concentrated effectively to the front surface direction. Moreover, a moire obstruction owing to the interference of each prism with a pitch of the light reflective layers is hardly caused. COPYRIGHT: (C)2009,JPO&INPIT
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