Organic electroluminescent display device and method of fabricating the same

• US 6,933,574 B2
• Filed: 12/27/2002
• Issued: 08/23/2005
• Est. Priority Date: 05/03/2002
• Status: Expired due to Term

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Philips LCD Company Limited (LG Display Co., Ltd.)
• Inventors: Park, Jae-Yong, Lee, Nam-Yang, Yoo, Choong-Keun, Kim, Ock-Hee, Kim, Kwan-Soo
• Primary Examiner(s): Tran, Minhloan
• Assistant Examiner(s): TRAN, TAN N
• Application Number:
  US10/329,923
• Publication Number:
  US 20030205763A1
• Time in Patent Office: 970 Days
• Field of Search: 257/359, 257/40, 257/98, 257/59, 257/72, 257/82, 257/258, 257/291, 257/88, 257/89, 257/93, 257/99, 257/100, 257/642, 313/500, 313/505, 313/504, 313/506, 313/113, 438/82, 438/99, 438/48, 438/128, 438/149, 438/151, 438/157, 438/283
• US Class Current: 257/359
• CPC Class Codes: H10K 2102/3026 Top emission
• CPC Class Codes: H10K 50/841 Self-supporting sealing arrangements
• CPC Class Codes: H10K 59/122 Pixel-defining structures or layers, e.g. banks
• CPC Class Codes: H10K 59/127 comprising two substrates, e.g. display comprising OLED array and TFT driving circuitry on different substrates
• CPC Class Codes: H10K 59/1275 Electrical connections of the two substrates

Abstract

An organic electroluminescent display device includes a first substrate, a second substrate spaced apart and facing the first substrate, a switching thin film transistor disposed on an inner surface of the first substrate, a driving thin film transistor electrically connected to the switching thin film transistor, a connecting electrode electrically connected to the driving thin film transistor, a first electrode disposed on an inner surface of the second substrate, a partition wall disposed on the first electrode and having a transmissive hole corresponding to a pixel region between the first and second substrates, an organic layer disposed within the transmissive hole on the first electrode, and a second electrode disposed on the organic layer, wherein the second electrode is electrically connected to the driving thin film transistor through the connecting electrode.

Claims

1. A method of fabricating an organic electroluminescent display device, comprising steps of:

forming a switching thin film transistor and a driving thin film transistor electrically interconnected on a first substrate;

forming a connecting electrode electrically contacting the driving thin film transistor;

forming a first electrode on a second substrate;

forming a partition wall on the first electrode to have a transmissive hole corresponding to a pixel region between the first and second substrates;

forming an organic layer on the first electrode within the transmissive hole;

forming a second electrode on the organic layer; and

bonding the first and second substrates together,

wherein the connecting electrode electrically contacts the second electrode.

2. The method according to claim 1, wherein the step of forming a partition wall includes forming a first end of the partition wall having a first width contacting the first electrode and forming a second end of the partition wall having a second width contact the second electrode.

3. The method according to claim 2, wherein the second width is larger than the first width.

4. The method according to claim 2, wherein a first end of the insulating pattern adjacent to the first electrode has a third width equal to the second width of the partition wall.

5. The method according to claim 1, wherein the first electrode functions as an anode electrode for injecting holes into the organic layer and the second electrode functions as a cathode electrode for injecting electrons into the organic layer.

6. The method according to claim 5, wherein the first electrode includes indium-tin-oxide.

7. The method according to claim 5, wherein the second electrode includes one of calcium, aluminum, and magnesium.

8. The method according to claim 1, wherein the connecting electrode includes one of calcium, aluminum, and magnesium.

9. The method according to claim 1, wherein the step of forming an organic layer includes forming a hole transporting layer on the first electrode, forming an emissive layer on the hole transporting layer, and forming an electron transporting layer on the emissive layer.

10. The method according to claim 1, further including a step of forming an insulating pattern between the first electrode and the partition wall.

11. The method according to claim 1, wherein both of the switching and driving thin film transistors include a gate electrode, an active layer, and source and drain electrodes.