| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical sheet capable of generating excellent visual field characteristics.SOLUTION: An optical sheet 60 includes a body part 65 and unit prisms 70 arranged on the incident side of the body part. Each of the unit prisms includes a first surface 71 and a second surface 72. An incident surface angle &thetas;b changes to be larger from an apex 75 of the unit prism toward a base end part 74 of the unit prism. An apex side straight line TEL2 has an angle of 45° or more and 55° or less to a sheet surface of the body part. A base end side straight line DEL2 has an angle of 60° or more and 70° or less to the sheet surface of the body part. A ratio of a maximum clearance Dx2 from a straight line SL2 connecting the apex to the base end part to the second surface and a distance Dy2 between the apex and the base end part is 0.04 or more and 0.06 or less. |
