Patent ID: 8727579

Claim:
A light extraction member comprising a plurality of unit lenses arranged on one surface thereof, wherein each of the unit lenses comprises a first conic lens forming a lower part of the unit lens and a second conic lens forming an upper part of the unit lens; and wherein the first conic lens has a lens shape expressed as [Equation 1], and the second conic lens has a lens shape expressed as [Equation 2]: y = H 1 - x 2 / r 1 1 + 1 - ( 1 + k 1 ) ⁢ ( 1 / r 1 ) 2 ⁢ x 2 [ Equation ⁢ ⁢ 1 ] where r 1 represents a curvature radius at a virtual vertex of the first conic lens, k 1 represents a conic constant of the first conic lens, and H 1 represents a height from the bottom surface of the first conic lens to the virtual vertex, and y = H 2 - x 2 / r 2 1 + 1 - ( 1 + k 2 ) ⁢ ( 1 / r 2 ) 2 ⁢ x 2 + y 0 [ Equation ⁢ ⁢ 2 ] where r 2 represents a curvature radius at the vertex of the second conic lens, k 2 represents the conic constant of the second conic lens, H 2 represents a height from the bottom surface of the second conic lens to the vertex, and y 0 represents a height from the bottom surface of the first conic lens to a position where the diameter of the bottom surface of the second conic lens is equalized to the diameter of the cross-section of the first conic lens.