Flexible OLED display panel and encapsulation method thereof

• US 10,629,850 B2
• Filed: 11/28/2017
• Issued: 04/21/2020
• Est. Priority Date: 11/21/2017
• Status: Active Grant

• Current Assignee: Wuhan China Star Optoelectronics Semiconductor Display Technology Ltd.
• Original Assignee: Wuhan China Star Optoelectronics Semiconductor Display Technology Ltd.
• Inventors: Peng, Simin, Hsu, Hsiang lun, Cao, Jun
• Primary Examiner(s): Tran, Long K
• Application Number:
  US15/580,216
• Publication Number:
  US 20190157617A1
• Time in Patent Office: 875 Days
• Field of Search: 257 40
• CPC Class Codes: H10K 2102/311 Flexible OLED
• CPC Class Codes: H10K 50/8445 multilayered coatings having a repetitive structure, e.g. having multiple organic-inorganic bilayers
• CPC Class Codes: H10K 50/846 comprising getter material or desiccants
• CPC Class Codes: H10K 71/00 Manufacture or treatment specially adapted for the organic devices covered by this subclass
• CPC Class Codes: H10K 77/111 Flexible substrates
• CPC Class Codes: Y02E 10/549 Organic PV cells

Abstract

A flexible OLED display panel is disclosed and includes an encapsulation structure. The encapsulation structure includes: a first inorganic thin film formed on a surface of an OLED display layer and a surrounding region of the surface; a first organic thin film formed on a surface of the first inorganic thin film; and a plurality of dams. Each of the dams has a first sub-dam close to the first inorganic thin film and a second sub-dam away from the first inorganic thin film. A gap is formed between the first sub-dam and the second sub-dam which are located at a same side. The gap is filled with desiccant.

Claims

1. A flexible OLED display panel, comprising:

a flexible substrate;

an OLED display layer formed on a surface of the flexible substrate; and

an encapsulation structure formed on the flexible substrate, covering the OLED display layer and configured to prevent permeation of moisture into the OLED display layer;

wherein the encapsulation structure includes;

a first inorganic thin film formed on a surface of the OLED display layer and a surrounding region of the surface;

a first organic thin film formed on a surface of the first inorganic thin film; and

a plurality of dams arranged on the surface of the flexible substrate and disposed at ends of the first inorganic thin film;

a second inorganic thin film formed on the flexible substrate and covering the first organic thin film and the dams;

a second organic thin film formed on a surface of the second inorganic thin film;

a third inorganic thin film formed on a surface of the second organic thin film;

wherein each of the dams includes a first sub-dam close to the first inorganic thin film and a second sub-dam away from the first inorganic thin film, a gap is formed between the first sub-dam and the second sub-dam which are located at a same end of the first inorganic thin film, and the gap is filled with waterproof material; and

a space is reserved between an edge of the first organic thin film and the first sub-dam to connect the first inorganic thin film and the second inorganic thin film;

the space is filled with a first inorganic material layer made of the same material as the first inorganic thin film and the second inorganic thin film;

wherein a sum of a film thickness of the first inorganic thin film and a film thickness of the first organic thin film is greater than a height of the dams.

2. The flexible OLED display panel as claimed in claim 1, wherein the flexible OLED display panel further comprises:

a third organic thin film formed on a surface of the third inorganic thin film, and a fourth inorganic thin film formed on a surface of the third organic thin film.

3. The flexible OLED display panel as claimed in claim 1, wherein the waterproof material is a cured liquid desiccant or a combination of a cured liquid desiccant and a second inorganic material layer which is made of the same material as the first inorganic material layer.

4. The flexible OLED display panel as claimed in claim 3, wherein a top surface of the desiccant is coplanar with a top surface of the dams.

5. The flexible OLED display panel as claimed in claim 4, wherein a gap between the first sub-dam and the second sub-dam is filled with the second inorganic material layer having a height less than a height of the first sub-dam and of the second sub-dam, and a liquid desiccant to be cured is formed on a surface of the second inorganic material layer.

6. A flexible OLED display panel, comprising:

a flexible substrate;

an OLED display layer formed on a surface of the flexible substrate; and

an encapsulation structure formed on the flexible substrate, covering the OLED display layer and configured to prevent permeation of moisture into the OLED display layer;

wherein the encapsulation structure includes;

a first inorganic thin film formed on a surface of the OLED display layer and a surrounding region of the surface;

a first organic thin film formed on a surface of the first inorganic thin film; and

a plurality of dams arranged on the surface of the flexible substrate and disposed at ends of the first inorganic thin film;

a second inorganic thin film formed on the flexible substrate and covering the first organic thin film and the dams;

a second organic thin film formed on a surface of the second inorganic thin film;

a third inorganic thin film formed on a surface of the second organic thin film;

wherein each of the dams includes a first sub-dam close to the first inorganic thin film and a second sub-dam away from the first inorganic thin film, a gap is formed between the first sub-dam and the second sub-dam which are located at a same end of the first inorganic thin film, and the gap is filled with waterproof material;

wherein a sum of a film thickness of the first inorganic thin film and a film thickness of the first organic thin film is greater than a height of the dams.

7. The flexible OLED display panel as claimed in claim 6, wherein the flexible OLED display panel further comprises:

a third organic thin film formed on a surface of the third inorganic thin film, and a fourth inorganic thin film formed on a surface of the third organic thin film.

8. The flexible OLED display panel as claimed in claim 6, wherein the waterproof material is a cured liquid desiccant or a combination of a cured liquid desiccant and a second inorganic material layer which is made of the same material as the first inorganic material layer.

9. The flexible OLED display panel as claimed in claim 8, wherein a top surface of the desiccant is coplanar with a top surface of the dams.

10. The flexible OLED display panel as claimed in claim 9, wherein a gap between the first sub-dam and the second sub-dam is filled with the second inorganic material layer having a height less than a height of the first sub-dam and of the second sub-dam, and a liquid desiccant to be cured is formed on a surface of the second inorganic material layer.