# US 11,444,263 B2 · Flexible display panel, and display device having thin film packaging layer with protrusions > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,444,263 B2 - Document ID: US11444263B2 - Status: Granted - Kind: B2 - Application number: 16/765,052 - Filed: 2019-10-12 - Published: 2020-11-19 - Granted: 2022-09-13 - Earliest claimed: 2018-11-02 - Assignees: Ordos Yuansheng Optoelectronics Co., Ltd.; Beijing BOE Technology Development Co., Ltd. - Applicants: Ordos Yuansheng Optoelectronics Co., Ltd.; Boe Technology Group Co., Ltd. - Inventors: Xiaodong Meng; Lingling Ma; Zihua Li; Zhibo Wen; Hengbo Liu; Yu Yuan; Lu Cai; Dong Xu; Guofang Xu; Xinpeng Gao; Qiang Wang; Ruiqing Zhang; Qiang Guo; Wenqiang Jin; Xudong Wang - Web page: https://patentgrep.com/patent/US11444263B2 ## CPC - H10K 77/111: {Flexible substrates} - G09F 9/30: in which the desired character or characters are formed by combining individual elements (panels comprising a number of electrodes in a single cell controlling light arriving from an independent light source, e.g. electro-optical or magneto-optical cell, G02F1/00) - H10K 59/8731: {multilayered coatings having a repetitive structure, e.g. having multiple organic-inorganic bilayers} - H10K 71/00: Manufacture or treatment specially adapted for the organic devices covered by this subclass - H10H 20/82: Roughened surfaces, e.g. at the interface between epitaxial layers - H10H 20/821: of the light-emitting regions, e.g. non-planar junctions - H10K 59/12: Active-matrix OLED [AMOLED] displays - H10K 2102/00: Constructional details relating to the organic devices covered by this subclass - H10K 2102/311: {Flexible OLED} - H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES - G09F: DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS - H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS ## Abstract A flexible display panel. The flexible display panel includes: a flexible substrate; a display element arranged on the flexible substrate; and a packaging layer covering the display element, the packaging layer including an inorganic thin film and an organic thin film that are stacked alternately, in which two protrusion structures that are engaged with each other are arranged between at least two adjacent thin films of the packaging layer. ## Claims ### Claim 1 A flexible display panel, comprising: a flexible substrate; a display element arranged on the flexible substrate; and a packaging layer covering the display element, the packaging layer comprising an inorganic thin film and an organic thin film that are stacked alternately, and comprising a first inorganic thin film, an organic thin film, and a second inorganic thin film that are stacked sequentially, wherein two protrusion structures that are engaged with each other are arranged between at least two adjacent thin films of the packaging layer, and a longitudinal section of each protrusion perpendicular to the flexible substrate is a semi-ellipse or a semi-circle, wherein a first protrusion structure and a second protrusion structure that are engaged with each other are arranged between the first inorganic thin film and the organic thin film, and the first protrusion structure and the first inorganic thin film are of an integrated structure, wherein a third protrusion structure and a fourth protrusion structure that are engaged with each other are arranged between the organic thin film and the second inorganic thin film, and the third protrusion structure and the organic thin film are of an integrated structure. ### Claim 2 (depends on 1) The flexible display panel of claim 1, wherein the protrusion structure comprises a plurality of protrusions arranged in an array. ### Claim 3 (depends on 1) A display device, comprising the flexible display panel of claim 1. ### Claim 4 (depends on 3) The display device of claim 3, wherein the protrusion structure comprises a plurality of protrusions arranged in an array. ### Claim 5 A method for packaging a flexible display panel, wherein the flexible display panel comprises: a flexible substrate; a display element arranged on the flexible substrate; and a packaging layer covering the display element, the packaging layer comprising an inorganic thin film and an organic thin film that are stacked alternately, and comprising a first inorganic thin film, an organic thin film, and a second inorganic thin film that are stacked sequentially, wherein two protrusion structures that are engaged with each other are arranged between at least two adjacent thin films of the packaging layer, and a longitudinal section of each protrusion perpendicular to the flexible substrate is a semi-ellipse or a semi-circle, wherein a first protrusion structure and a second protrusion structure that are engaged with each other are arranged between the first inorganic thin film and the organic thin film, and the first protrusion structure and the first inorganic thin film are of an integrated structure, wherein a third protrusion structure and a fourth protrusion structure that are engaged with each other are arranged between the organic thin film and the second inorganic thin film, and the third protrusion structure and the organic thin film are of an integrated structure, the method comprising: alternately depositing an inorganic thin film and an organic thin film on a display element arranged on a flexible substrate to form a packaging layer covering the display element; and forming two protrusion structures that are engaged with each other between at least two adjacent thin films of the packaging layer. ### Claim 6 (depends on 5) The method of claim 5, wherein the alternately depositing the inorganic thin film and the organic thin film comprises: sequentially depositing a first inorganic thin film, depositing an organic thin film, and depositing a second inorganic thin film. ### Claim 7 (depends on 6) The method of claim 6, wherein the depositing the first inorganic thin film comprises: depositing a first inorganic thin film integrated with the first protrusion structure on the display element arranged on the flexible substrate. ### Claim 8 (depends on 6) The method of claim 6, wherein the depositing the organic thin film comprises: depositing an organic thin film integrated with the third protrusion structure on the first inorganic thin film.