Patent ID: 8179497

Claim:
A liquid crystal display device comprising: a pair of substrates; a pair of polarizing plates which sandwiches the pair of substrates; a liquid crystal layer sandwiched by the pair of substrates; transmission openings formed in a pixel to limit the quantity of light which penetrates the liquid crystal layer; condensing elements formed on the side of one of the substrates, opposite to the side on which the liquid crystal layer is disposed, to condense light to the transmission openings; and a planar light-emitting element which emits light to be applied to the condensing elements; wherein the light to be emitted from the planar light-emitting element forms a certain angle with respect to a perpendicular of the planar light-emitting element when emitted; wherein the position of the transmission opening is relatively shifted with respect to that of the condensing element so as to increase the quantity of light which penetrates the transmission opening, in association with a light-emitting direction of the planar light-emitting element, wherein a light output angle of the planar light-emitting element at a peak luminance is tilted at an angle θ with respect to the perpendicular of the planar light-emitting element, the angle θ being more than 0 degree, and wherein a shift amount δ between a center of the transmission opening and a center of the condensing element is represented by the following equation, δ≅ C 1 T tan(θ/ n 2 ), where T denotes a thickness of one of the pair of substrates, disposed on the side of the planar light-emitting element; n 2 is a refraction index of the one of the pair of substrates; and C 1 is a coefficient ranging between 0.4 and 1.