Display device and method of manufacturing the same

Patent metadata

Field	Value
Publication number	US-9377649-B2
Application number	US-201414459189-A
Country	US
Kind code	B2
Filing date	Aug 13, 2014
Priority date	Jan 10, 2014
Publication date	Jun 28, 2016
Grant date	Jun 28, 2016

Abstract

A display device includes a substrate including a plurality of pixel areas and a non-pixel area disposed between the pixel areas, a tunnel-shaped cavity disposed on the substrate in each of the pixel areas, an image display layer disposed in the tunnel-shaped cavity, a roof layer disposed on the tunnel-shaped cavity and having an upper planarized surface, a black matrix disposed on the substrate in the non-pixel area, and a reflective electrode disposed under the tunnel-shaped cavity in a predetermined area of each of the pixel areas to reflect an external light.

First claim

What is claimed is:

1. A display device comprising:
a substrate including a plurality of pixel areas and a non-pixel area disposed between the pixel areas, wherein each of the pixel areas comprises a transmissive area and a reflective area;
a tunnel-shaped cavity disposed on the substrate in each of the pixel areas;
an image display layer disposed in the tunnel-shaped cavity;
a roof layer disposed on the tunnel-shaped cavity and having an upper planarized surface;
a black matrix disposed on the substrate in the non-pixel area; and
a reflective electrode disposed under the tunnel-shaped cavity in the reflective area of each of the pixel areas to reflect an external light,
wherein the tunnel-shaped cavity has a closed end and an open end facing each other, and the closed end is formed in the reflective area and the open end is formed in the transmissive area.

2. The display device of claim 1 , further comprising a color filter disposed on the substrate in each of the pixel areas.

3. The display device of claim 2 , wherein the color filter comprises a red color filter, a green color filter, or a blue color filter.

4. The display device of claim 2 , further comprising:
a first electrode disposed on the color filter; and
a second electrode extending in a first direction and spaced apart upward from the substrate in the pixel area and a predetermined area of the non-pixel area to define the tunnel-shaped cavity, wherein the roof layer is disposed on the second electrode.

5. The display device of claim 4 ,
wherein the non-pixel area comprises:
a first non-pixel area disposed between the pixel areas in the first direction and extending in a second direction crossing the first direction; and
a second non-pixel area disposed between the pixel areas in the second direction and extending in the first direction, the reflective area is disposed adjacent to the first non-pixel area, and the second electrode extends in a first area defined by a predetermined area of the second non-pixel area in the second direction.

6. The display device of claim 5 , wherein the tunnel-shaped cavity has a first height in the transmissive area, a second height in the reflective area, and a third height in the first area that does not overlap with the first non-pixel area, wherein the second height is less than the first height and greater than the third height.

7. The display device of claim 6 , wherein the second electrode is spaced apart from the color filter by the first height in the transmissive area, spaced apart from the color filter by the second height in the reflective area, and spaced apart from the black matrix by the third height in the first area that does not overlap with the first non-pixel area.

8. The display device of claim 6 , wherein the third height is equal to or less than about 1.1 micrometers.

9. The display device of claim 4 , further comprising:
a thin film transistor disposed on the substrate in the non-pixel area and connected to the first electrode; and
an insulating layer disposed on the substrate covering the thin film transistor and having a concavo-convex shape in the reflective area, wherein the reflective electrode is disposed on the insulating layer in the reflective area and having the concavo-convex shape, and the color filter and the black matrix are disposed on the insulating layer.

10. The display device of claim 9 , further comprising an alignment layer disposed on an inner surface of the second electrode in the tunnel-shaped cavity and on the substrate covering the first electrode, wherein the alignment layer encloses the tunnel-shaped cavity in the first area adjacent to the reflective area.

11. The display device of claim 10 , wherein the image display layer has a first distance corresponding to a difference in height between the alignment layer disposed on the first electrode in the transmissive area and the alignment layer disposed on the inner surface of the second electrode in the transmissive area, and a second distance corresponding to a difference in height between the alignment layer disposed on the first electrode in the reflective area and the alignment layer disposed on the inner surface of the second electrode in the reflective area, and wherein the second distance is about half of the first distance.

12. The display device of claim 1 , wherein the image display layer is a liquid crystal layer.

13. The display device of claim 1 , further comprising a sealing layer disposed on the roof layer and covering the substrate to seal the closed end of the tunnel-shaped cavity.

Assignees

• Samsung Display Co Ltd

Inventors

• Choi Sanggun
• Chae Seungyeon
• Cha Taewoon

Classifications

• H10W74/01

  Manufacture or treatment · CPC title

• H01L21/56

  Electricity · mapped topic

• G02F1/1368

  in which the switching element is a three-electrode device {(G02F1/136277 takes precedence)} · CPC title

• G02F1/1339

  Gaskets; Spacers; Sealing of cells · CPC title

• G02F1/1334 Primary

  based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals · CPC title