Patent ID: 7686463

Claim:
A display device having a view angle control sheet being bonded to a liquid crystal display panel, wherein the view angle control sheet comprises lens portions having trapezoidal shapes in cross section arranged at predetermined intervals, a wedge-shaped portion between the lens portions adjacent to each other is filled with the same material as that of the lens portions or with a material different from the lens portions, a base sheet on the liquid crystal display panel side of the lens portions and the wedge-shaped portion, wherein a light from the liquid crystal display panel side is the light with various angles, the wedge-shaped portion has a bottom surface on the liquid crystal display panel side while having a leading edge on an observer side with an outside light beam absorption effect, and the following relationship is held at least between a refractive index (N 2 ) of a material constituting a slope portion of the wedge-shaped portion and a refractive index (N 1 ) of a material constituting the lens portions: N2≧N1 and when a ratio of the refractive indexes (N 1 ) and (N 2 ) is N 2 /N 1 =R, the following relationship is held further in the angle (θ) (degree) formed by the slope portion of the wedge-shaped portion and a normal line of the light beam outgoing plane: −0.01< R −cos θ<0.002, and 3≦θ≦20.