Organic Light Emitting Display Device and Method of Manufacturing the Same

• US 20180122883A1
• Filed: 10/31/2017
• Published: 05/03/2018
• Est. Priority Date: 10/31/2016
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: BEAK, Jung-Sun, KIM, Jeong-Oh, LEE, Jong-Won
• Granted Patent: US 10,446,631 B2
• Time in Patent Office: Days
• CPC Class Codes: H01L 27/1225 with semiconductor materials not belonging to the group IV of the periodic table, e.g. InGaZnO
• CPC Class Codes: H01L 27/124 with a particular composition, shape or layout of the wiring layers specially adapted to the circuit arrangement, e.g. scanning lines in LCD pixel circuits wiring structures per se H01L23/52
• CPC Class Codes: H01L 27/1248 with a particular composition or shape of the interlayer dielectric specially adapted to the circuit arrangement
• CPC Class Codes: H01L 27/1255 integrated with passive devices, e.g. auxiliary capacitors
• CPC Class Codes: H01L 27/1262 with a particular formation, treatment or coating of the substrate
• CPC Class Codes: H01L 29/45 Ohmic electrodes
• CPC Class Codes: H01L 29/78633 with a light shield
• CPC Class Codes: H10K 59/1201 Manufacture or treatment
• CPC Class Codes: H10K 59/1213 the pixel elements being TFTs
• CPC Class Codes: H10K 59/1216 the pixel elements being capacitors
• CPC Class Codes: H10K 59/123 Connection of the pixel electrodes to the thin film transistors [TFT]
• CPC Class Codes: H10K 59/124 Insulating layers formed between TFT elements and OLED elements
• CPC Class Codes: H10K 59/131 Interconnections, e.g. wiring lines or terminals
• CPC Class Codes: H10K 59/351 comprising more than three subpixels, e.g. red-green-blue-white [RGBW]
• CPC Class Codes: H10K 59/38 comprising colour filters or colour changing media [CCM]
• CPC Class Codes: H10K 71/00 Manufacture or treatment specially adapted for the organic devices covered by this subclass
• CPC Class Codes: H10K 77/10 Substrates, e.g. flexible substrates
• CPC Class Codes: Y02E 10/549 Organic PV cells
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product

Abstract

Disclosed are an organic light emitting display device to improve an aperture ratio, and a method of manufacturing the same. The organic light emitting display device includes a plurality of contact holes overlapping an anode of an organic light emitting element in each sub-pixel region, wherein conductive films connected through at least one of the contact holes are transparent, thus allowing regions, where the contact holes are formed, to be used as light emitting regions, thereby improving an aperture ratio.

Claims

1. A display device, comprising:

a transparent substrate;

a plurality of pixels on the substrate, each pixel comprising;

a light emitting element on the substrate;

a first thin film transistor (TFT) on the substrate, the first TFT including an active layer and a first electrode electrically connected to the active layer, wherein the first electrode includes;

a first conductive layer formed of transparent conductive material, the first conductive layer including a first portion and a second portion, and

a second conductive layer contacting the first portion of the first conductive layer,

wherein the second portion of the first conductive layer is disposed below the light emitting element, and does not contact the second conductive layer.

2. The display device of claim 1, wherein the pixel further comprises an insulating layer on the first electrode, wherein the insulating layer contacts a top surface of the second conductive layer, and contacts a top surface of the second portion of the first conductive layer.

3. The display device of claim 1, wherein the pixel further comprises an insulating layer on the substrate formed with an opening, and wherein the second portion of the first conductive layer is disposed in the opening.

4. The display device of claim 3, wherein the light emitting element includes an anode electrode, and the anode electrode contacts the second portion of the first conductive layer.

5. The display device of claim 3, wherein the pixel further comprises a third conductive layer below the insulating layer, wherein the third conductive layer is formed of transparent conductive material, and wherein the second portion of the first conductive layer contacts a portion of the third conductive layer exposed through the opening.

6. The display device of claim 5, wherein the pixel further comprises a storage capacitor below the light emitting element, and wherein the third conductive layer is a lower storage electrode of the storage capacitor.

7. The display device of claim 5, wherein the pixel further comprises a driving TFT for driving the light emitting element, and wherein the third conductive layer extends from at least a part of a gate electrode of the driving transistor.

8. The display device of claim 1, wherein the second conductive layer is formed of opaque metal.

9. The display device of claim 1, further comprising:

a conductive line on the substrate extending in a first direction; and

a jumping line on the substrate electrically connected to the conductive line, wherein the jumping line extends in a second direction different from the first direction, and wherein the jumping line is formed of transparent conductive material.

10. The display device of claim 9, wherein a portion of the jumping line is disposed below the light emitting element.

11. The display device of claim 9, wherein the conductive line is a power line and the first TFT is a driving transistor for driving the light emitting element, and wherein the jumping line is electrically connected to the first TFT.

12. The display device of claim 9, wherein the pixel further comprises a sensing transistor for sensing a threshold voltage of the light emitting element, wherein the conductive line is a reference line electrically connected to the sensing transistor, and wherein the jumping line is electrically connected to the sensing transistor.

13. The display device of claim 9, wherein the first TFT includes a gate electrode, and the jumping line is formed in a same layer as a part of the gate electrode.

14. A method of manufacturing a display device, comprising:

forming an active layer of a first thin film transistor (TFT) on the substrate;

forming a first electrode of the first TFT electrically connected to the active layer, wherein the first electrode includes a first conductive layer formed of transparent conductive material, and includes a second conductive layer that contacts a first portion of the first conductive layer; and

forming a light emitting element on the substrate,

wherein a second portion of the first conductive layer is disposed below the light emitting element, and does not contact the second conductive layer.

15. The method of claim 14, wherein forming the first electrode further comprises:

depositing a first conductive pattern formed of the transparent conductive material on the substrate;

depositing a second conductive pattern on the first conductive pattern;

patterning the first conductive pattern and the second conductive pattern to form the first conductive layer and a third conductive pattern on the first conductive layer; and

etching a part of the third conductive pattern to form the second conductive layer and expose the second portion of the first conductive layer.

16. The method of claim 14, further comprising forming an insulating layer on the first electrode, wherein the insulating layer contacts a top surface of the second conductive layer, and contacts a top surface of the second portion of the first conductive layer.

17. The method of claim 14, further comprising:

forming an insulating layer on the substrate; and

forming an opening in the insulating layer,

wherein the second portion of the first conductive layer is disposed in the opening.

18. The method of claim 17, wherein the light emitting element includes an anode electrode, and the anode electrode contacts the second portion of the first conductive layer.

19. The method of claim 14, further comprising:

forming a conductive line on the substrate extending in a first direction; and

forming a jumping line on the substrate electrically connected to the conductive line, wherein the jumping line extends in a second direction different from the first direction, and wherein the jumping line is formed of transparent conductive material.

20. The method of claim 19, wherein a portion of the jumping line is disposed below the light emitting element.