Light-emitting diode lighting device

A light-emitting diode (LED) lighting device, comprising:

• a substrate;
• at least one first bottom electrode disposed on the substrate, wherein the first bottom electrode is reflective;
• a bottom transparent isolation layer covering the substrate, wherein the bottom transparent isolation layer has a first opening and a second opening therein to respectively expose at least a first part and a second part of the first bottom electrode;
• at least one first vertical LED disposed on the first exposed part of the first bottom electrode;
• at least one second vertical LED disposed on the second exposed part of the first bottom electrode, wherein the other part of the first bottom electrode surrounds the first part and the second part of the first bottom electrode and is configured to reflect light emitted from the first vertical LED and the second vertical LED;
• a first top transparent electrode electrically connected to the first vertical LED;
• a second top transparent electrode electrically connected to the second vertical LED, wherein the first top transparent electrode, the second top transparent electrode, and the first bottom electrode cooperate to electrically connect the first vertical LED and the second vertical LED in series;
• a second bottom electrode disposed on the substrate, wherein the bottom transparent isolation layer has a third opening therein to expose at least a part of the second bottom electrode;
• at least one third vertical LED disposed on the exposed part of the second bottom electrode, wherein the second top transparent electrode is further electrically connected to the third vertical LED, and the first bottom electrode, the second top transparent electrode, and the second bottom electrode cooperate to electrically connect the second vertical LED and the third vertical LED in series;
• and
• at least one auxillary electrode disposed between the second vertical LED and the third vertical LED and electrically coupled with the second top transparent electrode, wherein the auxiliary electrode is made of metal.