Organic light emitting diode display

Patent metadata

Field	Value
Publication number	US-9753200-B2
Application number	US-201514885905-A
Country	US
Kind code	B2
Filing date	Oct 16, 2015
Priority date	Apr 1, 2015
Publication date	Sep 5, 2017
Grant date	Sep 5, 2017

Abstract

An organic light emitting diode display including: a display panel; a first retarder on the display panel and including a first reactive liquid crystal; a second retarder on the first retarder and including a second reactive liquid crystal; and a polarizer on the second retarder, wherein a first optical axis of the first reactive liquid crystal is inclined by 2θ+45° relative to an absorption axis of the polarizer, and a second optical axis of the second reactive liquid crystal is inclined by θ relative to the absorption axis of the polarizer.

First claim

What is claimed is:

1. An organic light emitting diode display, comprising:
a display panel;
a first retarder on the display panel;
a second retarder on the first retarder; and
a polarizer on the second retarder,
wherein a first optical axis of the first retarder is inclined by 2θ+45° relative to an absorption axis of the polarizer, and a second optical axis of the second retarder is inclined by θ relative to the absorption axis of the polarizer; and
wherein the first retarder comprises a first reactive liquid crystal and the second retarder comprises a second reactive liquid crystal.

2. The organic light emitting diode display of claim 1 , wherein:
the first retarder has a λ/4 phase difference value and the second retarder has a λ/2 phase difference value.

3. The organic light emitting diode display of claim 1 , wherein:
the first retarder comprises a liquid crystal coating layer, and
the second retarder comprises a liquid crystal coating layer and/or an oriented film layer.

4. The organic light emitting diode display of claim 3 , wherein:
the liquid crystal coating layer comprises a reverse wavelength dispersion liquid crystal.

5. The organic light emitting diode display of claim 4 , wherein:
the liquid crystal coating layer comprises a photo-alignment layer and a liquid crystal layer aligned on the photo-alignment layer.

6. The organic light emitting diode display of claim 5 , wherein:
the liquid crystal coating layer comprises reactive mesogen.

7. The organic light emitting diode display of claim 3 , wherein:
the liquid crystal coating layer is an A-Plate liquid crystal coating layer.

8. The organic light emitting diode display of claim 7 , wherein:
the A-plate comprises a material selected from a group consisting of triacetyl cellulose (TAC), cycloolefin polymer (COP), cycloolefin copolymer (COC), polyethylene terephthalate (PET), polypropylene (PP), polycarbonate (PC), polysulfone (PSF), and a polymethyl methacrylate (PMMA).

9. The organic light emitting diode display of claim 7 , wherein:
the A-plate has a structure in which polymethyl methacrylate (PMMA), polystyrene (PS), and polymethyl methacrylate (PMMA) are sequentially stacked.

10. The organic light emitting diode display of claim 3 , wherein:
the second retarder comprises the oriented film layer and
the oriented film layer is a triacetyl cellulose (TAC)-based, polycarbonate (PC)-based, polymethyl(meta)acrylate-based, polyethylene terephthalate-based, and/or cycloolefin (COP)-based polymer layer.

11. The organic light emitting diode display of claim 1 , wherein:
the polarizer is a linear polarizer.

12. The organic light emitting diode display of claim 1 , further comprising:
a first pressure sensitivity adhesive between the first retarder and the second retarder.

13. The organic light emitting diode display of claim 1 , further comprising:
a second pressure sensitivity adhesive between the second retarder and the polarizer.

14. An organic light emitting diode display, comprising:
a display panel;
a first retarder on the display panel;
a second retarder on the first retarder; and
a polarizer on the second retarder,
wherein a first optical axis of the first retarder is inclined by 2θ+45° relative to an absorption axis of the polarizer, and a second optical axis of the second retarder is inclined by θ relative to the absorption axis of the polarizer; and
wherein a thickness of the first retarder is two times as large as that of the second retarder.

15. The organic light emitting diode display of claim 14 , wherein:
the thickness of the first retarder and the thickness of the second retarder meet the following Equation 1:

(

Δ
⁢

⁢

n
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(
λ
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Δ
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n
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(

550
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m

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-
1

)

f
⁢
irst

⁢

⁢
retarder

=

2
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x
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(

Δ
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n
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λ
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Δ
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n
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550

Assignees

• Samsung Display Co Ltd

Inventors

• Lee Hee Young
• Jang Yun
• Sang Hyeon Jeong
• Seo Eun Mi
• Choi Suk

Classifications

• G02B5/3016 Primary

  involving passive liquid crystal elements (optical properties of liquid crystals G02F1/0063; polarising elements associated with active liquid crystal devices G02F1/133528) · CPC title

• G02B5/32

  Holograms used as optical elements · CPC title

• G02B5/3083

  Birefringent or phase retarding elements (G02B5/3008, G02B5/3016 take precedence; systems for polarisation control G02B27/286; manufacturing phase modulating patterns by lithographic processes G03F7/001) · CPC title

• G02B27/286

  for controlling or changing the state of polarisation, e.g. transforming one polarisation state into another (G02B5/3083 takes precedence; light guide coupling means utilising polarising elements G02B6/34) · CPC title