Patent ID: 8432511

Claim:
A plane light source having a plurality of light emitting devices arranged in a light emitting device matrix having rows and columns at a substrate, the plane light source comprising: a first matrix having a plurality of light emitting devices arranged in rows and columns; and a second matrix having a plurality of light emitting devices arranged in rows and columns, wherein at least one of the rows of the first matrix is disposed to be shifted in relation to at least one of the rows of the second matrix in order to form a zigzag structure, and a pitch S between one light emitting device included in at least a portion of the light emitting device matrix and another light emitting device most adjacent to the one light emitting device satisfies the following equation to obtain uniform luminance distribution at a position distant from a light emitting surface of the light emitting device by an optical length l, S ≤ l 2 × tan ⁡ ( θ 2 + α ) , Equation where −π/18≦α≦π/18 is satisfied, and θ is an orientation angle of the light emitting device.