# US 9,753,200 B2 · Organic light emitting diode display

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- Number: US 9,753,200 B2
- Document ID: US9753200B2
- Status: Granted
- Kind: B2
- Application number: 14/885,905
- Filed: 2015-10-16
- Published: 2016-10-06
- Granted: 2017-09-05
- Earliest claimed: 2015-04-01
- Assignees: Samsung Display Co., Ltd.
- Applicants: Samsung Display Co., Ltd.
- Inventors: Hee Young Lee; Yun Jang; Hyeon Jeong Sang; Eun Mi Seo; Suk Choi
- Web page: https://patentgrep.com/patent/US9753200B2

## CPC

- G02B 5/3016: {involving passive liquid crystal elements (optical properties of liquid crystals G02F1/0063; polarising elements associated with active liquid crystal devices G02F1/133528)}
- G02B 5/3083: {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)}
- G02B 5/32: Holograms used as optical elements
- G02B 27/286: {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)}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## 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.

## Claims

### Claim 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.

### Claim 2 (depends on 1)

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.

### Claim 3 (depends on 1)

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.

### Claim 4 (depends on 3)

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

### Claim 5 (depends on 4)

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.

### Claim 6 (depends on 5)

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

### Claim 7 (depends on 3)

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

### Claim 8 (depends on 7)

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).

### Claim 9 (depends on 7)

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.

### Claim 10 (depends on 3)

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.

### Claim 11 (depends on 1)

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

### Claim 12 (depends on 1)

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

### Claim 13 (depends on 1)

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

### Claim 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.

### Claim 15 (depends on 14)

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
′
⁡
(
λ
)
Δ
⁢
⁢
n
′
⁡
(
550
⁢
m
)
-
1
)
f
⁢
irst
⁢
⁢
retarder
=
2
⁢
x
⁢
(
Δ
⁢
⁢
n
″
⁡
(
λ
)
Δ
⁢
⁢
n
″
⁡
(
550
⁢
m
)
-
1
)
s
⁢
econd
⁢
⁢
retarder
Equation
⁢
⁢
1
wherein Δn′ represents a phase difference value in a thickness direction for λ in the first retarder and Δn″ represents a phase difference value in a thickness direction for λ in the second retarder.

### Claim 16

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 and the second retarder are each a film patterned retarder (FPR) which comprises a plurality of left retarder patterns and a plurality of right retarder patterns.

### Claim 17

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;
wherein the first retarder comprises a first reactive liquid crystal and the second retarder comprises a second reactive liquid crystal; and
wherein the display panel is flexible, bendable, rollable, foldable, and/or stretchable.