Anti-reflective optical film and bendable display apparatus including the optical film

Patent metadata

Field	Value
Publication number	US-2017278902-A1
Application number	US-201715410072-A
Country	US
Kind code	A1
Filing date	Jan 19, 2017
Priority date	Mar 24, 2016
Publication date	Sep 28, 2017
Grant date	—

Abstract

A display apparatus includes a display panel configured to display an image. The display panel has a folding axis extending in a first direction. An optical film is disposed over the display panel. The optical film includes a circular polarizer including at least two phase retarders and one polarizer. Slow axes of each of the at least two phase retarders are located in the same quadrant of four quadrants of the optical film.

First claim

What is claimed is:

1 . A display apparatus comprising:
a display panel configured to display an image, the display panel including a folding axis extending in a first direction; and an optical film disposed over the display panel, the optical film comprising a circular polarizer comprising at least two phase retarders and one polarizer, wherein slow axes of each of the at least two phase retarders are located in a same quadrant of four quadrants of the optical film, and wherein the four quadrants of the optical film are delineated by the folding axis and a virtual axis extending in a second direction perpendicular to the first direction.

2 . The display apparatus of claim 1 , wherein
the at least two phase retarders comprise a quarter wave (λ/4) phase retarder and a half wave (λ/2) phase retarder.

3 . The display apparatus of claim 2 , wherein
the circular polarizer comprises the λ/4 phase retarder, the λ/2 phase retarder, and the polarizer, which are sequentially disposed over the display panel.

4 . The display apparatus of claim 3 , wherein
the slow axis of the λ/4 phase retarder and the slow axis of the λ/2 phase retarder form an angle of about 55 degrees to about 65 degrees with respect to each other.

5 . The display apparatus of claim 2 , wherein
the λ/4 phase retarder and the λ/2 phase retarder each comprise reactive liquid crystals.

6 . The display apparatus of claim 5 , wherein
the λ/4 phase retarder comprises nematic liquid crystals, and the λ/2 phase retarder comprises discotic or nematic liquid crystals.

7 . The display apparatus of claim 1 , wherein
an absorption axis of the polarizer is located in a same quadrant, of the four quadrants, as the slow axes of each of the at least two phase retarders.

8 . The display apparatus of claim 1 , wherein.
the display panel comprises: a flexible substrate; and an organic light-emitting device disposed over the flexible substrate, the organic light-emitting device comprising a pixel electrode, an opposite electrode, and an intermediate layer disposed between the pixel electrode and the opposite electrode, wherein the intermediate layer includes an organic light-emitting layer.

9 . The display apparatus of claim 8 , wherein
the display panel further comprises: a protection film disposed below the flexible substrate; and an encapsulating layer disposed over the flexible substrate and covering the organic light-emitting device, the encapsulating layer comprising at least one inorganic encapsulating layer and at least one organic encapsulating layer.

10 . The display apparatus of claim 2 , wherein
a slow axis of the λ/4 phase retarder and the folding axis form a first angle of about 62.5 degrees to about 72.5 degrees with respect to each other, a slow axis of the λ/2 phase retarder and the folding axis form a second angle of about 2.5 degrees to about 12.5 degrees with respect to each other, and each of the first and second angles is measured counterclockwise with respect to the folding axis.

11 . The display apparatus of claim 10 , wherein
an absorption axis of the polarizer and the folding axis form a third angle of about 75 degrees to about 85 degrees with respect to each other.

12 . The display apparatus of claim 2 , wherein
a slow axis of the λ/4 phase retarder and the folding axis form a first angle of about 152.5 degrees to about 162.5 degrees with respect to each other, a slow axis of the λ/2 phase retarder and the folding axis form a second angle of about 92.5 degrees to about 102.5 degrees with respect to each other, and each of the first and second angles is measured counterclockwise with respect to the folding axis.

13 . The display apparatus of claim 12 , wherein
an absorption axis of the polarizer and the folding axis form a third angle of about 165 degrees to about 175 degrees with respect to each other.

14 . The display apparatus of claim 3 , wherein
the optical film further comprises: a first adhesion layer disposed between the λ/4 phase retarder and the λ/2 phase retarder; and a second adhesion layer disposed between the λ/2 phase retarder and the polarizer.

15 . The display apparatus of claim 2 , wherein
the at least two phase retarders further comprise an additional half wave (λ/2) phase retarder.

16 . An optical film comprising:
a protection layer having a folding axis that extends in a first direction; and a circular polarizer disposed over the protection layer, the circular polarizer comprising at least two phase retarders and one polarizer, wherein slow axes of each of the at least two phase retarders are located in a same quadrant of four quadrants of the optical film, and wherein the four quadrants of the optical film are delineated by the folding axis and a virtual axis extending in a second direction perpendicular to the first direction.

17 . The optical film of claim 16 , wherein
the circular polarizer comprises: the at least two phase retarders comprising a quarter wave (λ/4) phase retarder and a half wave (λ/2) phase retarder, which are sequentially disposed over a display panel; and a polarizer disposed over the at least two phase retarders.

18 . The optical film of claim 17 , wherein
the slow axis of the λ/4 phase retarder and the slow axis of the λ/2 phase retarder form an angle of about 55 degrees to about 65 degrees with respect to each other.

19 . The optical film of claim 17 , wherein
the λ/4 phase retarder and the λ/2 phase retarder each comprise reactive liquid crystals.

20 . The optical film of claim 19 , wherein
the λ/4 phase retarder comprises nematic liquid crystals, and the λ/2 phase retarder comprises discotic car nematic liquid crystals.

21 . The optical film of claim 16 , wherein
an absorption axis of the polarizer is located in a same quadrant, of the four quadrants, as the slow axes of each of the at least two phase retarders,

22 . The optical film of claim 17 , further comprising:
a first adhesion layer disposed between the λ/4 phase retarder and the λ/2 phase retarder; and a second adhesion layer disposed between the λ/2 phase retarder and the polarizer.

23 . A flexible display apparatus, comprising:
a flexible display panel; and an optical film disposed on the flexible display panel, the optical film comprising a first phase retarder and a second phase retarder, wherein a slow axis of the first phase retarder is aligned with a slow axis of the second phase retarder.

24 . The flexible display apparatus of claim 23 , wherein alignment of the slow axis of the second phase retarder with the slow axis of the first phase retarder includes disposing the second phase retarder such that an angle between the slow axis of the first phase retarder and the slow axis of the second phase retarder is within a range of between 55 and 65 degrees.

25 . The flexible display apparatus of claim 23 , wherein alignment of the slow axis of the second phase retarder with the slow axis of the first phase retarder includes disposing the second phase retarder such that the slow axis of the first phase retarder and the slow axis of the second phase retarder are located within a same quadrant of four quadrants of the optical film that are defined by a folding axis of the optical film and a perpendicular axis that is perpendicular to the folding axis.

26 . The flexible display apparatus of

Assignees

• Samsung Display Co Ltd

Inventors

• Choi Dongwook
• Kim Taeeun
• Lee Heeyoung
• Lee Dukjin
• Jung Woosuk

Classifications

• Y02E10/549

  Organic PV cells · CPC title

• G02B1/08

  made of polarising materials · 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

• G02B1/11

  Anti-reflection coatings · CPC title

• H01L27/3246

  Electricity · mapped topic