IP Library Granted Patent US 12,446,455
Granted Patent B2
US 12,446,455 · App. 17/405,873 · Granted Oct 14, 2025

Flexible display panel

Inventors: Zhao Li (Beijing, CN); Pao Ming Tsai (Beijing, CN); Shiming Shi (Beijing, CN)
Assignee: BEIJING BOE TECHNOLOGY CO., LTD.
H10K77/111H10K50/844H10K50/86H10K59/40H10K59/873H10K59/8791H10K71/00H10K2102/311
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Quick Facts
Patent No.
US 12,446,455
App. No.
17/405,873
Granted
Oct 14, 2025
Kind
B2
Abstract

A flexible display panel is provided. The flexible display panel includes: a flexible substrate; a flexible display screen on the flexible substrate; a protection film disposed at a side of the flexible display screen away from the flexible substrate; and at least one optical clear adhesive layer between the flexible display screen and the protection film. The flexible display panel further includes a circular polarizer, and the circular polarizer is disposed on a side of the flexible display screen away from the flexible substrate. The flexible display panel is a flexible organic light-emitting display panel, the circular polarizer is between the flexible display screen and the at least one optical clear adhesive layer, and the protection film includes at least one inorganic material film.

Claims (46)

1. A flexible display panel, comprising:

a flexible substrate;

a flexible display screen on the flexible substrate;

a protection film disposed at a side of the flexible display screen away from the flexible substrate; and

at least one optical clear adhesive layer between the flexible display screen and the protection film,

wherein the flexible display panel further comprises a circular polarizer, and the circular polarizer is disposed on a side of the flexible display screen away from the flexible substrate,

the flexible display panel is a flexible organic light-emitting display panel,

the circular polarizer is between the flexible display screen and the at least one optical clear adhesive layer, and

the protection film comprises at least one inorganic material film,

wherein a stress neutral layer of the flexible display panel is between the flexible display screen and the circular polarizer, and the stress neutral layer is a plane formed by all positions where internal tangential stress is zero in case of the flexible display panel being bent and deformed.

2. The flexible display panel according to claim 1 , wherein the protection film further comprises at least one organic material film, and the at least one inorganic material film and the at least one organic material film are stacked.

3. The flexible display panel according to claim 1 , wherein the protection film further comprises at least two organic material film, and the at least one inorganic material film and the at least two organic material film form a stacked structure of inorganic material film—organic material film—inorganic material film.

4. The flexible display panel according to claim 2 , wherein the protection film further comprises at least one inorganic-organic material mixed film, and the at least one inorganic material film, the at least one organic material film and the at least one inorganic-organic material mixed film form a stacked structure of inorganic material film—organic material film—inorganic-organic material mixed film.

5. The flexible display panel according to claim 2 , wherein a material of the at least one organic material film comprises polyimide or polymethyl methacrylate.

6. The flexible display panel according to claim 1 , wherein the flexible substrate comprises an organic plastic substrate, and a material of the organic plastic substrate comprises polycarbonate, polyethylene terephthlate, polyethylene naphthalate, polyether sulfone, or polyimide.

7. The flexible display panel according to claim 1 , wherein the circular polarizer comprises a polarizing functional film, and a material of the polarizing functional film comprises polyvinyl alcohol or carbon nanotube.

8. A flexible display panel, comprising:

a flexible substrate;

a flexible display screen on the flexible substrate;

a protection film disposed at a side of the flexible display screen away from the flexible substrate; and

a connection layer sandwiched between the flexible display screen and the protection film,

wherein the connection layer comprises at least one hyperelasticity film and an optical clear adhesive layer,

the flexible display panel further comprises a circular polarizer, and the circular polarizer is disposed on a side of the flexible display screen away from the flexible substrate,

the flexible display panel is a flexible organic light-emitting display panel,

the circular polarizer is between the flexible display screen and the connection layer, and

the protection film comprises at least one inorganic material film,

wherein a stress neutral layer of the flexible display panel is between the flexible display screen and the circular polarizer, and the stress neutral layer is a plane formed by all positions where internal tangential stress is zero in case of the flexible display panel being bent and deformed.

9. The flexible display panel according to claim 8 , wherein the protection film further comprises at least one organic material film, and the at least one inorganic material film and the at least one organic material film are stacked.

10. The flexible display panel according to claim 8 , wherein the protection film further comprises at least two organic material film, and the at least one inorganic material film and the at least two organic material film form a stacked structure of inorganic material film—organic material film—inorganic material film.

11. The flexible display panel according to claim 9 , wherein the protection film further comprises at least one inorganic-organic material mixed film, and the at least one inorganic material film, the at least one organic material film and the at least one inorganic-organic material mixed film form a stacked structure of inorganic material film—organic material film—inorganic-organic material mixed film.

12. The flexible display panel according to claim 9 , wherein a material of the at least one organic material film comprises polyimide or polymethyl methacrylate.

13. The flexible display panel according to claim 8 , further comprising a touch screen,

wherein the touch screen is on a side of the flexible display screen closer to the protection film, and the stress neutral layer is on the touch screen.

14. A flexible display panel, comprising:

a flexible substrate;

a flexible display screen on the flexible substrate;

a protection film disposed at a side of the flexible display screen away from the flexible substrate; and

at least one optical clear adhesive layer between the flexible display screen and the protection film,

wherein the flexible display panel further comprises a circular polarizer, and the circular polarizer is disposed on a side of the flexible display screen away from the flexible substrate,

the flexible display panel is a flexible organic light-emitting display panel,

the circular polarizer is between the flexible display screen and the at least one optical clear adhesive layer, and

the protection film comprises at least one inorganic-organic material mixed film,

wherein a stress neutral layer of the flexible display panel is between the flexible display screen and the circular polarizer, and the stress neutral layer is a plane formed by all positions where internal tangential stress is zero in case of the flexible display panel being bent and deformed.

15. The flexible display panel according to claim 14 , wherein the protection film further comprises at least one organic material film, and the at least one inorganic-organic material mixed film and the at least one organic material film are stacked.

16. The flexible display panel according to claim 15 , wherein the at least one inorganic-organic material mixed film comprises two inorganic-organic material mixed films, and the two inorganic-organic material mixed films and the at least one organic material film form a stacked structure of inorganic-organic material mixed film—organic material film—inorganic-organic material mixed film.

17. The flexible display panel according to claim 15 , wherein a material of the at least one organic material film comprises polyimide or polymethyl methacrylate.

Assignments (6)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Nov 13, 2025
From: BOE TECHNOLOGY GROUP CO., LTD.
To: BEIJING BOE TECHNOLOGY DEVELOPMENT CO., LTD.
Reel/Frame 074243/0733 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Sep 12, 2025
From: BOE TECHNOLOGY GROUP CO., LTD.
To: BEIJING BOE TECHNOLOGY DEVELOPMENT CO., LTD.
Reel/Frame 072895/0836 →
CHANGE OF NAME Recorded Sep 11, 2025
From: BOE TECHNOLOGY GROUP CO., LTD.
To: BEIJING BOE TECHNOLOGY DEVELOPMENT CO., LTD.
Reel/Frame 072857/0525 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Aug 18, 2021
From: LI, ZHAO
To: BOE TECHNOLOGY GROUP CO., LTD.
Reel/Frame 057219/0825 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Aug 18, 2021
From: TSAI, PAO MING
To: BOE TECHNOLOGY GROUP CO., LTD.
Reel/Frame 057219/0857 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Aug 18, 2021
From: SHI, SHIMING
To: BOE TECHNOLOGY GROUP CO., LTD.
Reel/Frame 057219/0897 →
Priority Claims (1)
CN 201710094071.6 · Feb 21, 2017 · national
Continuity (2)
Continuation In Part 15764580
Related Publication 20210376270A1 · Dec 2, 2021
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