Patent ID: 8143779
Filing Date: 2012-03-27
Classification: H01L

Abstract:
1. A system for displaying images, comprising: a tandem electroluminescent device, comprising: a first electrode; N electroluminescent units disposed on the first electrode in sequence, wherein N is an integral and not less than 2; a second electrode disposed on the Nth electroluminescent unit; and N−1 interconnecting electrodes, wherein each of the interconnecting electrodes is disposed between two adjacent electroluminescent units, wherein the first electroluminescent unit comprises a first emitting layer and a second emitting layer in sequence from the first electrode and the first and second emitting layers have different physical quantities, wherein the Nth electroluminescent unit comprises a third emitting layer and a fourth emitting layer in sequence from the first electrode and the third and fourth emitting layers have different physical quantities, wherein the physical quantity of the third emitting layer is the same as that of the second emitting layer and the physical quantity of the fourth emitting layer is the same as that of the first emitting layer.