ORGANIC LIGHT EMITTING DIODE DISPLAY AND A METHOD OF MANUFACTURING THE SAME

• US 20170365649A1
• Filed: 06/16/2017
• Published: 12/21/2017
• Est. Priority Date: 06/17/2016
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Kim, Duk-Sung, An, Byung Seon
• Granted Patent: US 10,608,060 B2
• Time in Patent Office: Days
• CPC Class Codes: H01L 27/1222 with a particular composition, shape or crystalline structure of the active layer
• 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 27/1255 integrated with passive devices, e.g. auxiliary capacitors
• CPC Class Codes: H01L 27/1288 employing particular masking sequences or specially adapted masks, e.g. half-tone mask
• CPC Class Codes: H01L 28/60 Electrodes
• CPC Class Codes: H01L 29/41733 for thin film transistors with insulated gate
• CPC Class Codes: H01L 29/7869 having a semiconductor body comprising an oxide semiconductor material, e.g. zinc oxide, copper aluminium oxide, cadmium stannate
• CPC Class Codes: H10K 50/81 Anodes
• CPC Class Codes: H10K 50/82 Cathodes
• 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 59/122 Pixel-defining structures or layers, e.g. banks
• CPC Class Codes: H10K 59/123 Connection of the pixel electrodes to the thin film transistors [TFT]
• CPC Class Codes: H10K 59/131 Interconnections, e.g. wiring lines or terminals
• CPC Class Codes: H10K 71/00 Manufacture or treatment specially adapted for the organic devices covered by this subclass
• CPC Class Codes: H10K 71/621 Providing a shape to conductive layers, e.g. patterning or selective deposition

Abstract

An organic light-emitting diode display including a substrate, a first transistor, and an organic light-emitting element. The first transistor is positioned on the substrate. The first transistor includes a first active layer including a first source region, a first channel region extending from the first source region, a first drain region extending from the first channel region, a first conductive pattern, and a first gate electrode positioned on the first active layer. The organic light-emitting element is connected to the first transistor. The first conductive pattern is in contact with the first active layer and covers the first source region and the second source region.

Claims

1. An organic light-emitting diode display, comprising:

a substrate;

a first transistor positioned on the substrate, wherein the first transistor includes a first active layer including a first source region, a first channel region extending from the first source region, a first drain region extending from the first channel region, a first conductive pattern, and a first gate electrode positioned on the first active layer; and

an organic light-emitting element connected to the first transistor, wherein

the first conductive pattern is in contact with the first active layer and covers the first source region and the first drain region.

2. The organic light-emitting diode display of claim 1, wherein

the first conductive pattern does not overlap the first channel region.

3. The organic light-emitting diode display of claim 1, further comprising:

a second transistor, wherein the second transistor includes;

a second active layer including a second drain region connected to the first gate electrode;

a second channel region extending from the second drain region;

a second source region extending from the second channel region;

a second conductive pattern in contact with the second active layer and covering the second source region and the second drain region; and

a second gate electrode positioned on the second active layer.

4. The organic light-emitting diode display of claim 3, wherein

the second conductive pattern does not overlap the second channel region.

5. The organic light-emitting diode display of claim 3, wherein

the second active layer is positioned at the same layer as the first active layer, and

the second conductive pattern is positioned at the same layer as the first conductive pattern.

6. The organic light-emitting diode display of claim 3, further comprising:

a first capacitor electrode including a first capacitor pattern connecting the first gate electrode and the second drain region to each other, and a second capacitor pattern in contact with the first capacitor pattern and covering the first capacitor pattern; and

a second capacitor electrode positioned on the first capacitor electrode and connecting the first drain region and the organic light-emitting element to each other, wherein

the first capacitor electrode is disposed at the same layer as the first active layer and the second active layer.

7. The organic light-emitting diode display of claim 6, wherein

the second capacitor pattern is positioned at the same layer as the first conductive pattern and the second conductive pattern, and

the second capacitor electrode is positioned at the same layer as the first gate electrode and the second gate electrode.

8. The organic light-emitting diode display of claim 3, further comprising

a data line extending in a first direction along a substrate, the data line comprising:

a first data pattern connected to the second source region and positioned at the same layer as the second active layer; and

a second data pattern in contact with the first data pattern and covering the first data pattern.

9. The organic light-emitting diode display of claim 8, wherein

the second data pattern is positioned at the same layer as the first conductive pattern and the second conductive pattern.

10. The organic light-emitting diode display of claim 8, further comprising

a scan line extending in a second direction along the substrate, connected to the second gate electrode, and positioned at the same layer as the second gate electrode, wherein

the second direction crosses the first direction.

11. The organic light-emitting diode display of claim 10, further comprising

a driving power source line disposed on the substrate and separated from the scan line, extending in the second direction and configured to be connected to the first source region, and disposed at substantially the same layer as the scan line.

12. The organic light-emitting diode display of claim 11, further comprising

a bypass line disposed on the substrate and separated from each of the scan line and the driving power source line, extending in the second direction and connected to the organic light-emitting element, and positioned at the same layer as the driving power source line.

13. The organic light-emitting diode display of claim 1, wherein

the organic light-emitting element includes:

a first electrode connected to the first transistor;

an organic emission layer positioned on the first electrode;

a second electrode positioned on the organic emission layer; and

a pixel definition layer including an opening overlapping a part of the first electrode.

14. The organic light-emitting diode display of claim 13, wherein

the first electrode includes a plurality of first electrodes, and

the pixel definition layer includes a depressed portion, the depressed portion overlapping adjacent first electrodes.

15. The organic light-emitting diode display of claim 13, wherein

the surface of the pixel definition layer has a curved shape.

16. The organic light-emitting diode display of claim 1, wherein the first active layer includes polysilicon or an oxide semiconductor.

17. The organic light-emitting diode display of claim 1, wherein the first conductive pattern has an island shape.

18. A method of manufacturing an organic light-emitting diode display, comprising:

forming a semiconductor pattern and a first metal pattern on a substrate;

forming a first insulating layer on the first metal pattern, the first insulating layer including a first contact hole overlapping a part of the first metal pattern;

forming a second metal pattern on the first insulating layer;

forming a second insulating layer on the second metal pattern, the second insulating layer including a second contact hole overlapping a portion of the second metal pattern; and

forming an organic light-emitting element on the second insulating layer, wherein the organic light-emitting element is in contact with the second metal pattern through the second contact hole, wherein

the first metal pattern is in contact with the semiconductor pattern and covers a part of the semiconductor pattern, and

the second metal pattern is in contact with the first metal pattern through the first contact hole.

19. The method of claim 18, wherein

forming the semiconductor pattern and the first metal pattern is performed using a half-tone mask.

20. The method of claim 18, wherein

forming the organic light-emitting element includes:

forming a first electrode layer and an organic layer on the second insulating layer, wherein the organic layer covers the first electrode layer; and

etching the first electrode layer and the organic layer using a half-tone mask and reflowing the etched organic layer using heat.