Patent ID: 8227797

Claim:
A transparent display apparatus having a transparent organic light emitting diode, the transparent organic light emitting diode comprising a glass substrate, a transparent anode, a hole transport layer, an emitting layer, an electron transport layer, and a transparent cathode, the transparent display apparatus comprising: an insulating layer stacked on the transparent cathode; first and second transparent Indium-Tin Oxide (ITO) layers stacked on an upper part of the insulating layer to deliver electromotive force onto an entire surface of the transparent display apparatus and to transmit or block light of images according to an on/off state of a power source; an electro chromic layer disposed between the first and the second transparent ITO layers and comprising transparent and colorless chemicals, wherein the electro chromic layer forms a color through an oxidation-reduction reaction of the chemicals according to the on/off state of the power source to absorb or block the light of images; and a substrate stacked on the second transparent ITO.