Patent ID: 8342708

Claim:
A light emitting device comprising: a double-sided light emitting element including a first light emitting element on one side of a substrate that emits light having a first wavelength and a second light emitting element on another side of the substrate that emits light having a second wavelength, wherein the first wavelength and the second wavelength are different each other; a first variable resistor coupled to the first light emitting element, the first variable resistor adjusting a first driving power applied to the first light emitting element; and a second variable resistor coupled to the second light emitting element, the second variable resistor adjusting a second driving power applied to the second light emitting element; and a support substrate and first and second power supply patterns positioned on the support substrate, the first and second power supply patterns applying power to the first and the second light emitting elements, respectively, wherein the first and the second variable resistors are connected to the first and second power supply patterns, respectively, and wherein at least one of the first and the second variable resistors includes a resistor pattern, multiple conductive patterns formed on the resistor pattern, and a resistance control wire that connects more than two conductive patterns selected from the multiple conductive patterns.