Patent ID: 7012743

Claim:
A lenticular lens sheet comprising a light-emission surface provided with lens elements, a black strip portion being provided at each border between the lens elements, wherein each lens element and a corresponding side wall of the black stripe portion is in contact with each other, wherein when it is assumed that P represents the pitch of the lens element; and H represents the width of the black stripe portion when viewed in a cross section perpendicular to the lens element, the difference F in height between the black stripe portion and the lens element is set to have a range that is expressed by the inequality: 0.098 P≦F≦ ( P−H )/2 tan(π/3) and wherein the width B as measured from an apex portion of the black stripe portion in regard to a colored portion on a side wall of the black stripe portion is set to have a range that is expressed by the inequality: 0.30 F≦B≦0.89 F.