Transparent display apparatus

Abstract

A transparent display apparatus is provided that is constructed to transmit or block a light of images selectively according to a supply of electric power to a conventional transparent organic light emitting diode. The transparent display apparatus includes a transparent organic light emitting diode having 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 includes an insulating layer stacked on the transparent cathode, and first and second transparent ITOs stacked on the insulating layer to deliver electromotive force onto an entire surface and to transmit or block the light of images according to the on/off state of a power source. The transparent display apparatus also includes an electro chromic layer provided between the first and the second transparent ITOs and including transparent and colorless chemicals. The electro chromic layer forms a color through oxidation-reduction reaction of the chemicals according to the on/off state of the power source to absorb or block the light of images. The transparent display apparatus further includes a substrate stacked on the second transparent ITO.

What is claimed is: 
     
       1. 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.   
     
     
       2. The transparent display apparatus as claimed in  claim 1 , wherein the electro chromic layer comprises transparent and colorless chemicals in a gel state, and the electro chromic layer has a sealing apparatus for sealing the gel. 
     
     
       3. The transparent display apparatus as claimed in  claim 1 , wherein the electro chromic layer forms a black color through an oxidation-reduction reaction of two kinds of chemicals, so as to block a light of background images and display a front side first screen, when the power source (0.4 to 1.6 V dc) is on, and
 wherein the electro chromic layer forms a transparent color, so as to absorb and transmit the light of background images and display a back side second screen, when the power source is off.   
     
     
       4. The transparent display apparatus as claimed in  claim 3 , wherein the front side first screen of the electro chromic layer is a phone-mode background of a watch-type phone, and
 wherein the back side second screen is a watch background of the watch-type phone.   
     
     
       5. The transparent display apparatus as claimed in  claim 1 , wherein the electro chromic layer adjusts transmittance through an intensity of the power source. 
     
     
       6. A watch-type electronic device having a watch portion providing time information, the watch-type electronic device comprising:
 an electro-chromic layer capable of being transparent or opaque based on an on/off state of a power source; and   a display including a display layer for displaying a phone-mode screen when the electro-chromic layer is opaqued by the power source being on,   wherein a call is made with the phone-mode screen, and time information is provided through the electro-chromic layer being transparent by the power source being off,   wherein the display includes:
 a transparent cathode; 
 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 display and to transmit or block light of images according to the on/off state of the power source; and 
 a substrate stacked on the second transparent ITO, 
   wherein the electro-chromic layer is disposed between the first and the second transparent ITO layers and includes transparent and colorless chemicals, and   wherein the electro chromic layer forms a black color when the power source is on.   
     
     
       7. The watch-type electronic device as claimed in claim 6, wherein the display is stacked on an upper part of the electro-chromic layer.