| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a wedge-shaped light guide plate for a front light which can uniformize luminance distribution while preventing the occurrence of interference fringes and improving luminance, and to provide a method for manufacturing the same. <P>SOLUTION: A light guide plate 4 has a nearly wedge-shaped cross section orthogonal to an incident plane 4a. The groove 7 is formed by an inclined plane 5 which forms an angle α to a light-emitting plane 4c and a light collection plane 6 which forms an angle γ to the light-emitting plane 4c, and both planes form a vertical angle β. The tiling angle α and the vertical angle βare uniformly set in all the grooves 7. The pack 8 and valley 9 of each groove 7 is formed by the inclined plane 5 and the light collection plane 6, and each pitch P between the peaks 8 are set uniformly. A groove depth dm increases monotonously from the groove 7 near the incident plane 4a toward the groove 7 near the plane 4b opposed to the incident plane 4a. <P>COPYRIGHT: (C)2003,JPO |
