Patent ID: 8300185

Claim:
A liquid crystal display device, comprising: a liquid crystal display panel which has a pair of polarizing plates; and first and second light diffusing layers, each of which has a first major surface and a second major surface opposing each other and each of which is arranged such that the first major surface opposes a viewer side surface of the liquid crystal display panel; wherein each of the first and second light diffusing layers includes a first region formed of a first substance which has a first refractive index N 1 and a plurality of second regions formed of a second substance which has a second refractive index N 2 , the second refractive index N 2 being smaller than the first refractive index N 1 ; the plurality of second regions are arranged in the first region at a predetermined pitch P in one direction in a plane parallel to the second major surface, and each of the plurality of second regions forms a plurality of interfaces with the first region, the interfaces being inclined by α° from a normal of the second major surface; the first light diffusing layer is closer to the liquid crystal display panel than the second light diffusing layer is, and the plurality of second regions of the first light diffusing layer are arranged in a stripe pattern along a horizontal direction of the liquid crystal display panel; each of the second regions of the first and second light diffusing layers is approximated to an isosceles triangle where a base is on the second major surface side, a vertex is on the first major surface side, and a vertex angle is 2α; and formulae shown below are met: H ≤ P tan ⁢ ⁢ 2 ⁢ α + tan ⁢ ⁢ α and cos ⁡ [ α ⁡ ( 2 ⁢ n - 1 ) ] > N 2 N 1 where H is a height of the isosceles triangle, and n is an integer not less than 2.