1. A light emitting device, comprising: a first electrode layer; an organic light emitting layer formed on the first electrode layer; and a second electrode layer formed on the organic light emitting layer, wherein the organic light emitting layer is sandwiched between the first electrode layer and the second electrode layer, the second electrode layer includes a plurality of electrode patterns separated from one another, the electrode patterns of the second electrode correspond to a plurality of monochromatic blocks and have different sizes or numbers to form different density, and the electrode patterns are divided into a plurality of electrode pattern groups that are arranged in an alternate manner, wherein each of the electrode patterns is free from being connected to a thin film transistor (TFT) and a chiplet.