Light source device

A light source device, comprising:

• a substrate having a first surface and a second surface that is opposite to the first surface;
• an upper electrode layer and a lower electrode layer disposed on the first surface and the second surface of the substrate, respectively, wherein the lower electrode layer includes a first lower electrode sub-layer and a second lower electrode sub-layer that is coplanar with the first lower electrode sub-layer;
• a light emitting unit mounted on the upper electrode layer, wherein the light emitting unit is electrically coupled to the first lower electrode sub-layer through the upper electrode layer;
• a surrounding frame disposed on the first surface and surrounding an external side of the light emitting unit;
• a conductive unit disposed on the surrounding frame and electrically coupled to the second lower electrode sub-layer, wherein the conductive unit includes a plurality of first pads or a plurality of second pads, and a first height of the first pads on the surrounding frame with respect to the substrate is different from a second height of the second pads of the surrounding frame with respect to the substrate;
• a light permeable member disposed on the surrounding frame and covering the light emitting unit;
• and
• at least one detecting circuit formed on the light permeable member and including at least two contacts, wherein the at least two contacts of the at least one detecting circuit are connected to the first pads or the second pads, and the at least one detecting circuit is electrically coupled to the second lower electrode sub-layer through the conductive unit.