Display device and manufacturing method thereof

• US 9,235,074 B2
• Filed: 08/07/2013
• Issued: 01/12/2016
• Est. Priority Date: 01/23/2013
• Status: Expired due to Fees

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Park, Hong Sick, Kim, Seon-II, Kong, Hyang-Shik, Kim, Yeun Tae, Jeong, Chang Oh, Moon, Min Ho
• Primary Examiner(s): Kim, Dennis Y
• Application Number:
  US13/961,793
• Publication Number:
  US 20140204300A1
• Time in Patent Office: 888 Days
• US Class Current: 1/1
• CPC Class Codes: G02F 1/133305 Flexible substrates, e.g. plastics, organic film
• CPC Class Codes: G02F 1/133377 Cells with plural compartments or having plurality of liquid crystal microcells partitioned by walls, e.g. one microcell per pixel
• CPC Class Codes: G02F 1/1341 Filling or closing of cells
• CPC Class Codes: G02F 1/13458 Terminal pads
• CPC Class Codes: G02F 1/136286 Wiring, e.g. gate line, drain line
• CPC Class Codes: G02F 1/1368 in which the switching element is a three-electrode device G02F1/136277 takes precedence

Abstract

The present invention relates to a display device and a manufacturing method thereof, wherein a spoilage layer generated in a manufacturing process is removed, and a manufacturing method of a display device according to an exemplary embodiment of the present invention includes: forming a thin film transistor on a substrate including a plurality of pixel areas; forming a pixel electrode connected to the thin film transistor in the pixel area; forming a sacrificial layer on the pixel electrode; forming a barrier layer on the sacrificial layer; forming a common electrode on the barrier layer; forming a roof layer on the common electrode; patterning the barrier layer, the common electrode, and the roof layer to exposed a portion of the sacrificial layer thereby forming an injection hole; removing the sacrificial layer to form a microcavity for a plurality of pixel areas; removing the barrier layer.

Claims

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

forming a thin film transistor on a substrate including a plurality of pixel areas;

forming a pixel electrode connected to the thin film transistor in the pixel area;

forming a sacrificial layer on the pixel electrode;

forming a barrier layer on the sacrificial layer;

forming a common electrode on the barrier layer;

forming a roof layer on the common electrode;

patterning the barrier layer, the common electrode, and the roof layer to expose a portion of the sacrificial layer, thereby forming an injection hole;

removing the sacrificial layer to form a microcavity for a plurality of pixel areas;

removing the barrier layer;

injecting a liquid crystal into the microcavity through the injection hole; and

forming an encapsulation layer on the roof layer to seal the microcavity,wherein the barrier layer is made of metal or metal oxide having a different etching rate from the common electrode.

2. The method of claim 1, wherein

the barrier layer is made of a material having a different etching rate from the common electrode.

3. The method of claim 1, wherein

the barrier layer is made of one of zinc-aluminum oxide (ZAO), gallium-zinc oxide (GZO), and copper.

4. The method of claim 3, wherein

the common electrode is made of indium-zinc oxide (IZO).

5. The method of claim 1, wherein

the barrier layer is formed with a thinner thickness than the common electrode.

6. The method of claim 5, wherein

the thickness of the barrier layer is 50 Å

or more.

7. The method of claim 1, wherein

the sacrificial layer is made of a photosensitive organic material, and

removing the sacrificial layer includes supplying a developer through the injection hole to remove the sacrificial layer.

8. The method of claim 7, wherein removing the barrier layer includes supplying an etchant through the injection hole to remove the barrier layer.

9. The method of claim 1, wherein

the sacrificial layer is formed with the same pattern as the barrier layer.

10. The method of claim 1, further comprising:

forming a gate line and a gate pad connected to the gate line on the substrate;

forming a gate insulating layer on the gate line and the gate pad;

forming a data line and a data pad connected to the data line on the gate insulating layer; and

forming a passivation layer on the data line and the data pad,

wherein a portion of the thin film transistor is connected to the gate line and another portion of the thin film transistor is connected to the data line.

11. The method of claim 10, further comprising

patterning the passivation layer and the gate insulating layer to remove at least a portion of the gate insulating layer and the passivation layer positioned on the gate pad and at least a portion of the passivation layer positioned on the data pad,

wherein forming the pixel electrode includes,

forming a first assistance gate pad on the gate pad and forming a first assistance data pad on the data pad, and

forming the first assistance gate pad and the second assistance data pad with the same material as the pixel electrode.

12. The method of claim 11, further comprising

patterning the sacrificial layer to remove a portion of the sacrificial layer positioned on the first assistance gate pad and the first assistance data pad,

wherein forming the barrier layer includes forming a second assistance gate pad on the first assistance gate pad and forming a second assistance data pad on the first assistance data pad, and

forming the second assistance gate pad and the second assistance data pad with the same material as the barrier layer.

13. The method of claim 12, wherein

forming the common electrode includes forming a third assistance gate pad on the second assistance gate pad and a third assistance data pad is formed on the second assistance data pad, and

forming the third assistance gate pad and the third assistance data pad with the same material as the common electrode.