Patent ID: 8390020

Claim:
A face-up optical semiconductor device, comprising: a first semiconductor layer of a first conductive type; an active layer provided on the first semiconductor layer; a second semiconductor layer of a second conductive type provided on the active layer; a transparent electrode layer provided on the second semiconductor layer; a first electrode having a pad portion provided on any of the second semiconductor layer and the transparent electrode layer and an auxiliary electrode portion connected to the pad portion; a second electrode provided on an exposed region of the first semiconductor layer; and at least one outside independent electrode disposed adjacent to the transparent electrode layer and between the auxiliary electrode portion and the second electrode, the outside independent electrode being physically independent of the auxiliary electrode portion, wherein the auxiliary electrode portion is disposed on a first circle having a center located at the second electrode or on a tangent line of the first circle, the outside independent electrode is disposed on a second circle having a center located at the second electrode or on a tangent line of the second circle so as to be an arc or linear electrode along the second circle or the tangent line of the second circle, and a first radial distance between the first circle of the auxiliary electrode portion and the second circle of the outer independent electrode is smaller than a minimum value distance, the minimum value distance is measured between the pad electrode of the first electrode and an area, the area is a region of the transparent electrode layer where a current density of the transparent electrode layer is a minimum when the at least one outside independent electrode is removed.