Patent ID: 7292391

Claim:
A method of manufacturing a lens substrate with straight light control portions, the lens substrate being provided with a plurality of microlenses each having a convex curved surface on a surface thereof, the lens substrate being used so that light enters the lens substrate from the side of the surface thereof on which the plurality of microlenses are provided, the convex curved surface of each microlens as a whole allowing the light to pass, the method comprising the steps of: preparing a substrate having a plurality of concave portions on one surface thereof; forming the plurality of microlenses using the substrate having the plurality of concave portions; and forming a straight light control portion in the vicinity of the apex of each of the plurality of microlenses, the straight light control portion being used for controlling the ratio of straight light in the light entering each of the plurality of microlenses from the side of the surface of the lens substrate, wherein, in the case where the average diameter of the microlenses and the average diameter of the straight light control portions are respectively defined as D and d when viewed from the apex of the lens substrate, then D and d satisfy the relation: 1.2≦D/d ≦5.