US 12,226,985 B2
Supporting back film and manufacturing method therefor, and flexible display device
Huiqiang Song, Beijing (CN); Lei Yang, Beijing (CN); and Fengping Wu, Beijing (CN)
Assigned to CHENGDU BOE OPTOELECTRONICS TECHNOLOGY CO., LTD., Sichuan (CN); and BOE TECHNOLOGY GROUP CO., LTD., Beijing (CN)
Appl. No. 17/802,964
Filed by Chengdu BOE Optoelectronics Technology Co., Ltd., Sichuan (CN); and BOE Technology Group Co., Ltd., Beijing (CN)
PCT Filed Nov. 17, 2021, PCT No. PCT/CN2021/131320
§ 371(c)(1), (2) Date Aug. 29, 2022,
PCT Pub. No. WO2022/156334, PCT Pub. Date Jul. 28, 2022.
Claims priority of application No. 202110087536.1 (CN), filed on Jan. 22, 2021.
Prior Publication US 2023/0094074 A1, Mar. 30, 2023
Int. Cl. B32B 3/02 (2006.01); B32B 3/26 (2006.01); B32B 15/082 (2006.01); B32B 15/09 (2006.01); B32B 15/18 (2006.01); B32B 27/30 (2006.01); B32B 27/36 (2006.01); G06F 1/16 (2006.01)
CPC B32B 27/365 (2013.01) [B32B 3/266 (2013.01); B32B 15/082 (2013.01); B32B 15/09 (2013.01); B32B 15/18 (2013.01); B32B 27/308 (2013.01); B32B 2307/7376 (2023.05); B32B 2311/30 (2013.01); B32B 2333/12 (2013.01); B32B 2457/20 (2013.01); G06F 1/1652 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A supporting back film, provided on a back side of a flexible display panel, wherein, the flexible display panel is provided with a bendable area, and a bending axis corresponding to the bendable area extends in a first direction, wherein:
the supporting back film comprises a first supporting structure and a second supporting structure provided on at least one side of the first supporting structure in a second direction; the second direction intersects with the first direction; an orthographic projection of the first supporting structure on the flexible display panel covers the bendable area, and the first supporting structure is bendable; wherein,
a volume of the second supporting structure is greater than or equal to a volume of the first supporting structure, and a density of the second supporting structure is less than a density of the first supporting structure; or
a volume of the first supporting structure is greater than or equal to a volume of the second supporting structure, and a density of the first supporting structure is less than a density of the second supporting structure;
wherein the first supporting structure comprises a main body part and a plug-in part located on opposite sides of the main body part in the second direction; an orthographic projection of the main body part on the flexible display panel covers the bendable region; the plug-in part comprises at least one plug-in block, and the plug-in block is fitted in the second supporting structure.