Organic light emitting display device and method of manufacturing the same

Abstract

A design for an organic light-emitting display device that increases capacitor capacity and increases aperture ratio by forming an initializing voltage electrode on a different layer than an electrode of the capacitor and forming only one via hole for an entire set of three sub-pixels. One of the source electrodes and the drain electrodes of switching transistors for the three sub-pixels are formed in common, along with the gate electrodes of the switching transistors.

What is claimed: 
     
       1. An organic light-emitting display device, comprising:
 first through third sub-pixels each comprising at least one capacitor, at least one thin-film transistor (TFT), and an organic light-emitting device (OLED);   first, second and third switching devices including one of a common source electrode and a common drain electrode, the first, second and third switching devices being electrically connected to the first through third sub-pixels, respectively to apply an initializing voltage to the first, second and third sub-pixels when the first, second and third switching devices are turned on;   a planarization layer arranged on the first, second and third switching devices;   a via-hole arranged through the planarization layer to expose the one of a common source electrode and a common drain electrode; and   an initializing electrode electrically connected to the one of a common source electrode and a common drain electrode through the via-hole, the initializing electrode to transmit the initializing voltage to the one of a common source electrode and a common drain electrode.   
     
     
       2. The organic light-emitting display device of  claim 1 , the organic light-emitting display device is composed of just one via hole to serve first, second and third sub-pixels. 
     
     
       3. The organic light-emitting display device of  claim 1 , wherein each organic light-emitting device comprises:
 a pixel electrode;   a counter electrode; and   an organic layer arranged between the pixel electrode and the counter electrode.   
     
     
       4. The organic light-emitting display device of  claim 3 , wherein the initializing electrode is comprised of a same material and is arranged on a same layer as the pixel electrode. 
     
     
       5. The organic light-emitting display device of  claim 1 ,
 wherein the first switching device comprises:
 a first active layer to form a channel, 
 a first gate electrode insulated from the first active layer, 
 a first source electrode electrically connected to the first active layer, and 
 a first drain electrode; 
   wherein the second switching device comprises:
 a second active layer to form a channel, 
 a second gate electrode insulated from the second active layer, 
   a second source electrode electrically connected to the second active layer, and
 a second drain electrode; 
   wherein the third switching device comprises:
 a third active layer to form a channel, 
 a third gate electrode insulated from the third active layer, 
 a third source electrode electrically connected to the third active layer, and 
 a third drain electrode; and 
   wherein the first through third source electrodes commonly constitute a common source electrode.   
     
     
       6. The organic light-emitting display device of  claim 5 , wherein the first, second and third active layers are connected together. 
     
     
       7. The organic light-emitting display device of  claim 5 , wherein the first, second and third gate electrodes are connected together. 
     
     
       8. The organic light-emitting display device of  claim 5 , further comprising:
 a gate insulating layer arranged between the first, second and third active layers and the first through third gate electrodes;   an insulating interlayer arranged on the first, second and third gate electrodes; and   a common contact hole arranged in the gate insulating layer and in the insulating interlayer to electrically connect the common source electrode to the first, second and third active layers.   
     
     
       9. The organic light-emitting display device of  claim 8 , the organic light-emitting display device being composed of just one common contact hole to serve the first, second and third sub-pixels. 
     
     
       10. The organic light-emitting display device of  claim 8 , wherein the common contact hole is arranged near the via-hole. 
     
     
       11. A method of manufacturing an organic light-emitting display device, the method comprising:
 defining first through third sub-pixels each comprising at least one capacitor, at least one thin-film transistor (TFT), and an organic light-emitting device (OLED);   forming first through third switching devices electrically connected to first through third sub-pixels, respectively, the first through third switching devices include one of a commonly formed drain electrode or a commonly formed source electrode, the first through third switching devices to apply an initializing voltage to the first through third sub-pixels when the first through third switching devices are turned on;   forming a planarization layer on the first through third switching devices;   forming a via-hole through the planarization layer to expose the one of a commonly formed drain electrode or a commonly formed source electrode; and   forming an initializing electrode electrically connected to the one of a commonly formed drain electrode or a commonly formed source electrode via the via-hole to transmit the initializing voltage to the one of a commonly formed drain electrode or a commonly formed source electrode.   
     
     
       12. The method of  claim 11 , the organic light-emitting display device is composed of just one via hole to serve first through third sub-pixels. 
     
     
       13. The method of  claim 11 , wherein each organic light-emitting device comprises:
 a pixel electrode;   a counter electrode; and   an organic layer arranged between the pixel electrode and the counter electrode.   
     
     
       14. The method of  claim 13 , wherein the initializing electrode is comprised of the same material and is arranged on the same layer as the pixel electrode. 
     
     
       15. The method of  claim 11 , wherein the first switching device is formed by sequentially forming a first active layer to form a channel, a first gate electrode insulated from the first active layer, a first source electrode electrically connected to the first active layer, and a first drain electrode; the second switching device is formed by sequentially forming a second active layer to form a channel, a second gate electrode insulated from the second active layer, a second source electrode electrically connected to the second active layer, and a second drain electrode; the third switching device is formed by sequentially forming a third active layer to form a channel, a third gate electrode insulated from the third active layer, a third source electrode electrically connected to the third active layer, and a third drain electrode; and wherein the first through third source electrodes commonly constitute a common source electrode. 
     
     
       16. The method of  claim 15 , wherein the first through third active layers are connected together. 
     
     
       17. The method of  claim 15 , wherein the first through third gate electrodes are connected together. 
     
     
       18. The method of  claim 15 , further comprising:
 forming a gate insulating layer between the first through third active layers and the first through third gate electrodes;   forming an insulating interlayer on the first through third gate electrodes; and   forming a common contact hole in the gate insulating layer and in the insulating interlayer to electrically connect the common source electrode to the first through third active layers.   
     
     
       19. The method of  claim 18 , the organic light-emitting display device being composed of just one common contact hole to serve the first through third sub-pixels. 
     
     
       20. The method of  claim 11 , wherein the organic light emitting display device comprises:
 the first through third sub-pixels each comprising at least one capacitor, at least one thin-film transistor (TFT), and an organic light-emitting device (OLED);   first through third switching devices including one of the commonly formed source electrode and the commonly formed drain electrode, the first through third switching devices being electrically connected to the first through third sub-pixels, respectively to apply the initializing voltage to the first through third sub-pixels when the first through third switching devices are turned on;   the planarization layer arranged on the first through third switching devices;   the via-hole arranged through the planarization layer to expose the one of the commonly formed source electrode and the commonly formed drain electrode; and   the initializing electrode electrically connected to the one of the commonly formed source electrode and the commonly formed drain electrode through the via-hole, the initializing electrode to transmit the initializing voltage to the one of the commonly formed source electrode and the commonly formed drain electrode.   
     
     
       21. An organic light-emitting display device, comprising:
 first through third sub-pixels each comprising at least one capacitor, at least one thin-film transistor (TFT), and an organic light-emitting device (OLED) including a pixel electrode;   first, second and third switching devices including a common active layer and one of a common source electrode and a common drain electrode, the first, second and third switching devices being electrically connected to the first through third sub-pixels, respectively to apply an initializing voltage to the first, second and third sub-pixels when the first, second and third switching devices are turned on;   a planarization layer;   a via hole in the planarization layer; and   an initializing electrode disposed on a same layer as one of the pixel electrodes and electrically connected to the one of a common source electrode and a common drain electrode through the via hole to transmit the initializing voltage to the one of a common source electrode and a common drain electrode.    
     
     
       22. The organic light-emitting display device of claim 21, wherein
 the first switching device comprises:
 a first gate electrode insulated from the common active layer, 
 a first source electrode electrically connected to the common active layer, and 
 a first drain electrode; 
   wherein the second switching device comprises:
 a second gate electrode insulated from the common active layer, 
 a second source electrode electrically connected to the common active layer, and 
 a second drain electrode; 
   wherein the third switching device comprises:
 a third gate electrode insulated from the common active layer, 
 a third source electrode electrically connected to the common active layer, and 
 a third drain electrode; and 
   wherein the first through third source electrodes commonly constitute a common source electrode.    
     
     
       23. The organic light-emitting display device of claim 22, wherein the first, second and third gate electrodes are connected together.  
     
     
       24. The organic light-emitting display device of claim 22, further comprising:
 a gate insulating layer disposed between the common active layer and the first through third gate electrodes;   an insulating interlayer disposed on the first, second and third gate electrodes; and   a common contact hole defined in the gate insulating layer and in the insulating interlayer to electrically connect the common source electrode to the common active layer.    
     
     
       25. The organic light-emitting display device of claim 24, wherein the organic light-emitting display device is composed of just one common contact hole to serve the first, second and third sub-pixels.  
     
     
       26. The organic light-emitting display device of claim 22, further comprising:
 a gate insulating layer between the common active layer and the first through third gate electrodes;   an insulating interlayer disposed on the first, second and third gate electrodes; and   a common contact hole defined in the gate insulating layer and in the insulating interlayer to electrically connect the common source electrode to the common active layer,   wherein the planarization layer is disposed on the first, second and third switching devices; and   the via hole exposes the one of a common source electrode and a common drain electrode, and wherein the common contact hole is arranged near the via-hole.    
     
     
       27. The organic light-emitting display device of claim 26, wherein the common contact hole does not overlap the via-hole.  
     
     
       28. The organic light-emitting display device of claim 21, wherein:
 the planarization layer is disposed on the first, second and third switching devices; and   the via hole exposes the one of a common source electrode and a common drain electrode.    
     
     
       29. The organic light-emitting display device of claim 28, the organic light-emitting display device is composed of just one via hole to serve first, second and third sub-pixels.  
     
     
       30. A method of manufacturing an organic light-emitting display device, the method comprising:
 defining first through third sub-pixels each comprising at least one capacitor, at least one thin-film transistor (TFT), and an organic light-emitting device (OLED) including a pixel electrode;   forming first through third switching devices electrically connected to first through third sub-pixels, respectively, the first through third switching devices including a common active layer and one of a commonly formed drain electrode or a commonly formed source electrode, the first through third switching devices applying an initializing voltage to the first through third sub-pixels when the first through third switching devices are turned on;   forming a planarization layer;   forming a via hole through the planarization layer; and   forming an initializing electrode on a same layer as one of the pixel electrodes, the initializing electrode being electrically connected to the one of a commonly formed drain electrode or a commonly formed source electrode through the via hole to transmit the initializing voltage to the one of a commonly formed drain electrode or a commonly formed source electrode.    
     
     
       31. The method of claim 30, wherein
 the first switching device is formed by sequentially forming a first gate electrode insulated from the common active layer, a first source electrode electrically connected to the common active layer, and a first drain electrode;   the second switching device is formed by sequentially forming a second gate electrode insulated from the common active layer, a second source electrode electrically connected to the common active layer, and a second drain electrode;   the third switching device is formed by sequentially forming a third gate electrode insulated from the common active layer, a third source electrode electrically connected to the common active layer, and a third drain electrode; and wherein   the first through third source electrodes commonly constitute a common source electrode.    
     
     
       32. The method of claim 31, wherein the first through third gate electrodes are connected together.  
     
     
       33. The method of claim 31, further comprising:
 forming a gate insulating layer between the common active layer and the first through third gate electrodes;   forming an insulating interlayer on the first through third gate electrodes; and   forming a common contact hole in the gate insulating layer and in the insulating interlayer to electrically connect the common source electrode to the common active layer.    
     
     
       34. The method of claim 33, the organic light-emitting display device being composed of just one common contact hole to serve the first through third sub-pixels.  
     
     
       35. The method of claim 31, further comprising:
 forming a gate insulating layer between the common active layer and the first through third gate electrodes;   forming an insulating interlayer on the first, second and third gate electrodes; and   forming a common contact hole in the gate insulating layer and in the insulating interlayer to electrically connect the common source electrode to the common active layer,   wherein the planarization layer is formed on the first, second and third switching devices; and   the via hole exposes the one of a common source electrode and a common drain electrode, and wherein the common contact hole is arranged near the via-hole.    
     
     
       36. The method of claim 35, wherein the common contact hole does not overlap the via-hole.  
     
     
       37. The method of claim 30, wherein:
 the step of forming a planarization layer comprises forming the planarization layer on the first, second and third switching devices; and   the step of forming a via hole through the planarization layer comprises exposing the one of a commonly formed source electrode and a commonly formed drain electrode.    
     
     
       38. The method of claim 37, the organic light-emitting display device is composed of just one via hole to serve first, second and third sub-pixels.