Patent ID: 8052319

Claim:
A display apparatus comprising: a display panel; a plurality of light sources provided below the display panel to emit light; and a diffusion plate provided between the display panel and the light sources to diffuse the light, the diffusion plate comprising a base having a front surface and a rear surface, and a plurality of convex portions on the front surface of the base, wherein a sectional surface of each convex portion is a crescent of an ellipse, wherein the sectional surface is perpendicular to the front surface, a ratio of a major axis to a minor axis of the ellipse is from about 2.6 to about 3.3, a ratio of a distance between two adjacent sources and a distance between one of the light sources and the diffusion plate is about 2.0 and more, and when a length from the front surface of the base to a vertex of each convex portion is h and a length of the chord of the ellipse is p, equation h = 1 2 ⁢ p × tan ⁢ ⁢ θ is satisfied, wherein θ is about 41° to about 45° .