Flexible display apparatus

Patent metadata

Field	Value
Publication number	US-12216353-B2
Application number	US-202318136396-A
Country	US
Kind code	B2
Filing date	Apr 19, 2023
Priority date	Nov 28, 2016
Publication date	Feb 4, 2025
Grant date	Feb 4, 2025

Abstract

A flexible display apparatus including a bending area and a non-bending area. The flexible display apparatus further includes a display panel and a polarizing structure disposed on the display panel. The polarizing structure includes a λ/4 phase retardation layer, a linear polarizer disposed on the λ/4 phase retardation layer, and a first adhesive structure disposed between the λ/4 phase retardation layer and the linear polarizer. The linear polarizer includes a stretched polymer film. The first adhesive structure is an adhesive layer with a glass transition temperature that is greater than or equal to 40° C. and less than or equal to 150° C. Accordingly, deformation of the λ/4 phase retardation layer may be prevented or reduced when the flexible display apparatus is folded or bent, thereby improving display quality.

First claim

What is claimed is:

1. A flexible display apparatus comprising:
a display panel; and
a polarizing structure disposed on the display panel,
wherein the polarizing structure comprises:
a λ/4 phase retardation layer;
a linear polarizer disposed on the λ/4 phase retardation layer;
a first adhesive structure disposed between the λ/4 phase retardation layer and the linear polarizer;
a λ/2 phase retardation layer disposed between the λ/4 phase retardation layer and the linear polarizer; and
a second adhesive structure disposed between the λ/2 phase retardation layer and the linear polarizer,

wherein, in a plan view, an angle between an absorption axis or a transmission axis of the linear polarizer and a bending axis of the flexible display apparatus is 45 degrees±30 degrees, and
wherein a glass transition temperature of the first adhesive structure is greater than a glass transition temperature of the second adhesive structure, and
the first adhesive structure is an adhesive layer having the glass transition temperature greater than or equal to 40° C. and less than or equal to 150° C.; and
the second adhesive structure is an adhesive layer having the glass transition temperature greater than or equal to −35° C. and less than or equal to 0° C.

2. The flexible display apparatus of claim 1 , wherein:
the first adhesive structure is disposed between the λ/4 phase retardation layer and the λ/2 phase retardation layer; and
the second adhesive structure is directly contact with the linear polarizer.

3. The flexible display apparatus of claim 1 , wherein a thickness of the second adhesive structure is greater than a thickness of the first adhesive structure.

4. The flexible display apparatus of claim 1 , wherein a thickness of the first adhesive structure and a thickness of the second adhesive structure is less than or equal to 5 μm, respectively.

5. The flexible display apparatus of claim 1 , wherein:
a thickness of the λ/4 phase retardation layer and a thickness of the λ/2 phase retardation layer is greater than or equal to 0.5 μm and less than or equal to 2 μm, respectively; and
a total thickness, including the λ/4 phase retardation layer, the first adhesive structure, the λ/2 phase retardation layer, and the second adhesive structure, is greater than or equal to 1.2 μm and less than or equal to 14 μm.

6. The flexible display apparatus of claim 1 , wherein:
the first adhesive structure comprises an ultraviolet curable adhesive; and
the second adhesive structure comprises a pressure sensitive adhesive.

7. The flexible display apparatus of claim 1 , wherein, in a plan view:
an angle between an absorption axis or a transmission axis of the linear polarizer and a first optical axis of λ/4 phase retardation layer is 75 degrees±30 degrees; and
an angle between the absorption axis or the transmission axis and a second optical axis of the λ/2 phase retardation layer is 15 degrees±13 degrees.

8. The flexible display apparatus of claim 1 , wherein, in a plan view, an angle between a first optical axis of the λ/4 phase retardation layer and a second optical axis of the λ/2 phase retardation layer is 60 degrees±30 degrees.

Assignees

• Samsung Display Co Ltd

Inventors

• Lee Heeyoung
• Seo Eunmi

Classifications

• G02B5/3016

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• H10K77/111

  Flexible substrates · CPC title

• H10K59/40

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• H10K50/86

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