Patent · US12185575B2 · B2 · US

Display device

(11) Publication number

US12185575B2

(21) Application number

17/379,055

(22) Filing date

2021-07-19

(30) Priority date

2020-07-31

(43) Publication date

2024-12-31

(45) Date of grant

2024-12-31

(51) IPC

H10K 50/84; H10K 50/86

(52) CPC

G02F Optical devices or arrangements for the control of light by modification of the optical properties of the media of the elements involved therein; non-linear optics; frequency-changing of light; optical logic elements; optical analogue/digital converters: 1/133305, 1/133388, 1/133528, 2201/501, 2201/54
B66F Hoisting, lifting, hauling or pushing, not otherwise provided for, e.g. devices which apply a lifting or pushing force directly to the surface of a load: 3/22
G02B Optical elements, systems or apparatus: 5/3025, 5/3033
G03B Apparatus or arrangements for taking photographs or for projecting or viewing them; apparatus or arrangements employing analogous techniques using waves other than optical waves; accessories therefor: 21/58, 21/604
G06F Electric digital data processing: 1/1601, 1/1652
G09F Displaying; advertising; signs; labels or name-plates; seals: 9/30, 9/301
H10K Organic electric solid-state devices: 2102/311, 50/84, 50/86, 59/12, 59/50, 59/873, 59/874, 59/8791
H10W Generic packages, interconnections, connectors or other constructional details of devices covered by class H10: 90/00

(73) Assignee

LG Display Co Ltd

(72) Inventors

Jihun SONG; Hoiyong Kwon

(54) Title

Display device

(57) Abstract

The display device includes a display panel including an active area and a non-active area; and a polarization plate on the display panel, the polarization plate including a polarization layer. The polarization layer includes a first pattern corresponding to the active area and a second pattern corresponding to the non-active area, and the second pattern is spaced apart from the first pattern. Thus, it is possible to delay moisture absorption of a polarization layer.

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Claims (21)

A display device, comprising: a display panel including an active area and a non-active area; and a polarization plate on the display panel, the polarization plate including a polarization layer and protection layers respectively disposed on opposite surfaces of the polarization layer, wherein the polarization layer includes a first pattern corresponding to the active area and a second pattern corresponding to the non-active area, wherein the first pattern is continuous and planar across the first pattern and the second pattern is spaced apart from the first pattern, the second pattern being different from the first pattern, wherein the first pattern and the second pattern are spaced apart from each other by at least one of the protection layers, and wherein the polarization layer is a polyvinyl alcohol (PVA)-based polymer film.
The display device according to claim 1, wherein the second pattern is disposed to surround the first pattern.
The display device according to claim 1, wherein the second pattern includes a plurality of sub-patterns, the display device further comprising: a plurality of holes between the plurality of sub-patterns, wherein the plurality of sub-patterns each have a closed loop shape surrounding the first pattern and are sequentially disposed by the plurality of holes further away from the first pattern than a preceding one of the plurality of sub-patterns.
The display device according to claim 1, wherein the second pattern includes: a plurality of first sub-patterns corresponding to edges of the first pattern; and a plurality of second sub-patterns disposed between ends of the plurality of first sub-patterns and corresponding to corners of the first pattern, wherein the plurality of second sub-patterns at the corners of the first pattern are different in shape and arrangement from the plurality of first sub-patterns at the edges of the first pattern, and wherein each of the plurality of first sub-patterns and each of the plurality of second sub-patterns are different from the first pattern.
The display device according to claim 4, wherein the plurality of first sub-patterns has a line shape, and wherein the plurality of second sub-patterns has a dot shape.
The display device according to claim 4, wherein the plurality of first sub-patterns have outlines and the plurality of second sub-patterns have outlines, at least one of the outlines of the plurality of first sub-patterns and at least one of the outlines of the plurality of second sub-patterns having a zigzag shape.
The display device according to claim 1, wherein the second pattern includes a plurality of sub-patterns each having a dot shape and spaced from each other in successive rows and columns with each row and column being spaced further from the first pattern than a preceding row and column.
The display device according to claim 1, further comprising: a back cover on a rear surface of the display panel; and a barrier film on the polarization plate.
The display device according to claim 8, wherein the barrier film covers at least a part of side portions of the polarization plate and at least a part of side portions of the display panel.
The display device according to claim 9, wherein the display panel has a first side and a plurality of second sides different from the first side, the display device further comprising: a flexible film on the first side of the display panel, wherein the barrier film covers the side portions of the polarization plate and the side portions of the display panel on the plurality of second sides.
The display device according to claim 8, wherein the barrier film is in contact with one surface of the back cover.
The display device according to claim 8, further comprising: a roller coupled to the display panel and configured to wind or unwind the display panel and the back cover.
The display device according to claim 1, wherein the protection layers include a first protection layer and a second protection layer, and wherein the polarization plate is a multi-layer stack that includes, in sequential order: a phase delay layer; the first protection layer; the polarization layer; the second protection layer; and a surface layer.
A display device, comprising: a display panel including an active area and a non-active area; a polarization plate on the display panel, the polarization plate including a polarization layer and protection layers respectively disposed on opposite surfaces of the polarization layer in sequential order in a multi-layer stack; and a roller coupled to the display panel and configured to wind or unwind the display panel, wherein the polarization layer includes a first pattern corresponding to the active area, and a second pattern corresponding to the non-active area and surrounding the first pattern, wherein the first pattern and the second pattern are spaced apart from each other by at least one of the protection layers, wherein the polarization layer is a polyvinyl alcohol (PVA)-based polymer film, and wherein an entirety of the first pattern is continuous and absent of spacing and the second pattern is different from the first pattern.
The display device according to claim 14, wherein the second pattern includes a plurality of sub-patterns, and wherein one or more of the plurality of sub-patterns have a closed loop shape surrounding the first pattern, the display device further comprising: at least one hole in the polarization layer between the first pattern and the second pattern, the first pattern and the second pattern spaced apart by the at least one hole, wherein the polarization layer is a single layer and the at least one is hole is only through the polarization layer and is absent from any other layer in the multi-layer stack of the polarization plate.
The display device according to claim 15, wherein the protection layers between the first pattern and the second pattern have a closed loop shape.
The display device according to claim 14, wherein the second pattern includes a plurality of sub-patterns, and wherein at least one of the plurality of sub-patterns have a line shape or a dot shape.
The display device according to claim 14, wherein the second pattern includes a plurality of sub-patterns each having outlines, and wherein at least one of the outlines of the plurality of sub-patterns have a zigzag shape.
The display device according to claim 14, further comprising: a back cover on a rear surface of the display panel; and a barrier film on the polarization plate.
The display device according to claim 19, wherein the barrier film extends to one surface of the back cover and covers a part of side surfaces of the display panel.
The display device according to claim 14, wherein the second pattern includes a plurality of sub-patterns that are spaced apart from each other by a plurality of holes, and wherein the at least one of the protection layers fills the plurality of holes between the spaced apart plurality of sub-patterns of the second pattern.

Description

The present disclosure relates to a display device, and more particularly, to a rollable display device in which warpage of a display panel caused by moisture may be improved.

Display devices employed by the monitor of a computer, a TV, a mobile phone or the like include an organic light emitting display (OLED) that emits light by itself, and a liquid crystal display (LCD) with a separate light source.

As the display devices have been increasingly applied to diverse fields such as a computer monitor, a TV, and a personal mobile device, display devices having a large display area and a reduced volume and weight have been studied.

Further, recently, rollable display devices have attracted attention as a next-generation display device.

An object to be achieved by the present disclosure is to provide a display device in which moisture absorption of a polarization plate can be minimized.

Another object to be achieved by the present disclosure is to provide a display device in which moisture permeation occurring through side surfaces of a display panel and a polarization plate can be minimized.

Yet another object to be achieved by the present disclosure is to provide a display device in which warpage of a display panel caused by moisture absorption of a polarization plate can be improved.

Still another object to be achieved by the present disclosure is to provide a display device in which cracks in a substrate of a display panel caused by moisture absorption of a polarization plate can be suppressed.

Citations (13)

US20040137224A1
US20080186576A1
US20130193832A1
KR20130136805A
US20150339563A1
KR20170041792A
US20160299380A1
US20170156225A1
KR20170062896A
US20180024399A1
US20180040268A1
JP2020098326A
KR20200073387A

Record as JSON

{
  "publication_number": "US12185575B2",
  "country": "US",
  "kind": "B2",
  "title": "Display device",
  "abstract": "The display device includes a display panel including an active area and a non-active area; and a polarization plate on the display panel, the polarization plate including a polarization layer. The polarization layer includes a first pattern corresponding to the active area and a second pattern corresponding to the non-active area, and the second pattern is spaced apart from the first pattern. Thus, it is possible to delay moisture absorption of a polarization layer.",
  "claims": [
    "1. A display device, comprising: a display panel including an active area and a non-active area; and a polarization plate on the display panel, the polarization plate including a polarization layer and protection layers respectively disposed on opposite surfaces of the polarization layer, wherein the polarization layer includes a first pattern corresponding to the active area and a second pattern corresponding to the non-active area, wherein the first pattern is continuous and planar across the first pattern and the second pattern is spaced apart from the first pattern, the second pattern being different from the first pattern, wherein the first pattern and the second pattern are spaced apart from each other by at least one of the protection layers, and wherein the polarization layer is a polyvinyl alcohol (PVA)-based polymer film.",
    "2. The display device according to claim 1, wherein the second pattern is disposed to surround the first pattern.",
    "3. The display device according to claim 1, wherein the second pattern includes a plurality of sub-patterns, the display device further comprising: a plurality of holes between the plurality of sub-patterns, wherein the plurality of sub-patterns each have a closed loop shape surrounding the first pattern and are sequentially disposed by the plurality of holes further away from the first pattern than a preceding one of the plurality of sub-patterns.",
    "4. The display device according to claim 1, wherein the second pattern includes: a plurality of first sub-patterns corresponding to edges of the first pattern; and a plurality of second sub-patterns disposed between ends of the plurality of first sub-patterns and corresponding to corners of the first pattern, wherein the plurality of second sub-patterns at the corners of the first pattern are different in shape and arrangement from the plurality of first sub-patterns at the edges of the first pattern, and wherein each of the plurality of first sub-patterns and each of the plurality of second sub-patterns are different from the first pattern.",
    "5. The display device according to claim 4, wherein the plurality of first sub-patterns has a line shape, and wherein the plurality of second sub-patterns has a dot shape.",
    "6. The display device according to claim 4, wherein the plurality of first sub-patterns have outlines and the plurality of second sub-patterns have outlines, at least one of the outlines of the plurality of first sub-patterns and at least one of the outlines of the plurality of second sub-patterns having a zigzag shape.",
    "7. The display device according to claim 1, wherein the second pattern includes a plurality of sub-patterns each having a dot shape and spaced from each other in successive rows and columns with each row and column being spaced further from the first pattern than a preceding row and column.",
    "8. The display device according to claim 1, further comprising: a back cover on a rear surface of the display panel; and a barrier film on the polarization plate.",
    "9. The display device according to claim 8, wherein the barrier film covers at least a part of side portions of the polarization plate and at least a part of side portions of the display panel.",
    "10. The display device according to claim 9, wherein the display panel has a first side and a plurality of second sides different from the first side, the display device further comprising: a flexible film on the first side of the display panel, wherein the barrier film covers the side portions of the polarization plate and the side portions of the display panel on the plurality of second sides.",
    "11. The display device according to claim 8, wherein the barrier film is in contact with one surface of the back cover.",
    "12. The display device according to claim 8, further comprising: a roller coupled to the display panel and configured to wind or unwind the display panel and the back cover.",
    "13. The display device according to claim 1, wherein the protection layers include a first protection layer and a second protection layer, and wherein the polarization plate is a multi-layer stack that includes, in sequential order: a phase delay layer; the first protection layer; the polarization layer; the second protection layer; and a surface layer.",
    "14. A display device, comprising: a display panel including an active area and a non-active area; a polarization plate on the display panel, the polarization plate including a polarization layer and protection layers respectively disposed on opposite surfaces of the polarization layer in sequential order in a multi-layer stack; and a roller coupled to the display panel and configured to wind or unwind the display panel, wherein the polarization layer includes a first pattern corresponding to the active area, and a second pattern corresponding to the non-active area and surrounding the first pattern, wherein the first pattern and the second pattern are spaced apart from each other by at least one of the protection layers, wherein the polarization layer is a polyvinyl alcohol (PVA)-based polymer film, and wherein an entirety of the first pattern is continuous and absent of spacing and the second pattern is different from the first pattern.",
    "15. The display device according to claim 14, wherein the second pattern includes a plurality of sub-patterns, and wherein one or more of the plurality of sub-patterns have a closed loop shape surrounding the first pattern, the display device further comprising: at least one hole in the polarization layer between the first pattern and the second pattern, the first pattern and the second pattern spaced apart by the at least one hole, wherein the polarization layer is a single layer and the at least one is hole is only through the polarization layer and is absent from any other layer in the multi-layer stack of the polarization plate.",
    "16. The display device according to claim 15, wherein the protection layers between the first pattern and the second pattern have a closed loop shape.",
    "17. The display device according to claim 14, wherein the second pattern includes a plurality of sub-patterns, and wherein at least one of the plurality of sub-patterns have a line shape or a dot shape.",
    "18. The display device according to claim 14, wherein the second pattern includes a plurality of sub-patterns each having outlines, and wherein at least one of the outlines of the plurality of sub-patterns have a zigzag shape.",
    "19. The display device according to claim 14, further comprising: a back cover on a rear surface of the display panel; and a barrier film on the polarization plate.",
    "20. The display device according to claim 19, wherein the barrier film extends to one surface of the back cover and covers a part of side surfaces of the display panel.",
    "21. The display device according to claim 14, wherein the second pattern includes a plurality of sub-patterns that are spaced apart from each other by a plurality of holes, and wherein the at least one of the protection layers fills the plurality of holes between the spaced apart plurality of sub-patterns of the second pattern."
  ],
  "description_excerpt": "The present disclosure relates to a display device, and more particularly, to a rollable display device in which warpage of a display panel caused by moisture may be improved.\n\nDisplay devices employed by the monitor of a computer, a TV, a mobile phone or the like include an organic light emitting display (OLED) that emits light by itself, and a liquid crystal display (LCD) with a separate light source.\n\nAs the display devices have been increasingly applied to diverse fields such as a computer monitor, a TV, and a personal mobile device, display devices having a large display area and a reduced volume and weight have been studied.\n\nFurther, recently, rollable display devices have attracted attention as a next-generation display device.\n\nAn object to be achieved by the present disclosure is to provide a display device in which moisture absorption of a polarization plate can be minimized.\n\nAnother object to be achieved by the present disclosure is to provide a display device in which moisture permeation occurring through side surfaces of a display panel and a polarization plate can be minimized.\n\nYet another object to be achieved by the present disclosure is to provide a display device in which warpage of a display panel caused by moisture absorption of a polarization plate can be improved.\n\nStill another object to be achieved by the present disclosure is to provide a display device in which cracks in a substrate of a display panel caused by moisture absorption of a polarization plate can be suppressed.",
  "cpc": [
    "G02F 1/133305",
    "B66F 3/22",
    "G02B 5/3025",
    "G02B 5/3033",
    "G02F 1/133388",
    "G02F 1/133528",
    "G02F 2201/501",
    "G02F 2201/54",
    "G03B 21/58",
    "G03B 21/604",
    "G06F 1/1601",
    "G06F 1/1652",
    "G09F 9/30",
    "G09F 9/301",
    "H10K 2102/311",
    "H10K 50/84",
    "H10K 50/86",
    "H10K 59/12",
    "H10K 59/50",
    "H10K 59/873",
    "H10K 59/874",
    "H10K 59/8791",
    "H10W 90/00"
  ],
  "ipc": [
    "H10K 50/84",
    "H10K 50/86"
  ],
  "assignees": [
    "LG Display Co Ltd"
  ],
  "inventors": [
    "Jihun SONG",
    "Hoiyong Kwon"
  ],
  "filing_date": "2021-07-19",
  "publication_date": "2024-12-31",
  "grant_date": "2024-12-31",
  "priority_date": "2020-07-31",
  "application_number": "US-202117379055-A",
  "family_id": "77103965",
  "cited_by_count": 0,
  "citations": [
    "US20040137224A1",
    "US20080186576A1",
    "US20130193832A1",
    "KR20130136805A",
    "US20150339563A1",
    "KR20170041792A",
    "US20160299380A1",
    "US20170156225A1",
    "KR20170062896A",
    "US20180024399A1",
    "US20180040268A1",
    "JP2020098326A",
    "KR20200073387A"
  ]
}

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