# US 12,193,315 B2 · Flexible display panel, method for forming the same and adhesive application device for the method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,193,315 B2 - Document ID: US12193315B2 - Status: Granted - Kind: B2 - Application number: 17/552,312 - Filed: 2021-12-15 - Published: 2022-07-28 - Granted: 2025-01-07 - Earliest claimed: 2021-01-28 - Assignees: Chengdu Boe Optoelectronics Technology Co., Ltd.; Boe Technology Group Co., Ltd. - Applicants: Chengdu BOE Optoelectronics Technology Co., Ltd.; BOE Technology Group Co., Ltd. - Inventors: Yaming Wang; Jia Deng; Haitao Liang; Dongdong Zhao; Mingqi Gang; Shaoxiong Zhang; Jialin Wang - Web page: https://patentgrep.com/patent/US12193315B2 ## CPC - H10K 77/111: {Flexible substrates} - B32B 7/12: using interposed adhesives or interposed materials with bonding properties - B32B 37/1292: {selectively, e.g. in stripes, in patterns (B32B37/0076 takes precedence)} - H10K 59/8722: {Peripheral sealing arrangements, e.g. adhesives, sealants} - H10K 59/873: {Encapsulations} - B32B 2307/30: having particular thermal properties - B32B 2307/42: Polarizing, birefringent, filtering - B32B 2457/20: Displays, e.g. liquid crystal displays, plasma displays - G02B 5/3033: {in the form of a thin sheet or foil, e.g. Polaroid} - H10K 71/40: Thermal treatment, e.g. annealing in the presence of a solvent vapour - H10K 2102/311: {Flexible OLED} - H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES - B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## Abstract The present disclosure provides a flexible display panel, a method for forming the flexible display panel and an adhesive application device for the method. The flexible display panel includes a cover plate layer and a screen film layer. The screen film layer includes a plurality of film layers laminated one on another at one side of the cover plate layer, and an adhesive is filled into a gap between an edge of an outermost film layer of the screen film layer relative to the cover plate layer and the cover plate layer. ## Claims ### Claim 1 A flexible display panel, comprising a cover plate layer and a screen film layer, wherein the screen film layer comprises a plurality of film layers laminated one on another at one side of the cover plate layer, and an adhesive is filled into a gap between an edge of an outermost film layer of the screen film layer relative to the cover plate layer and the cover plate layer; wherein the screen film layer comprises a polarizer, a display film, a back film and a heat dissipation layer sequentially laminated one on another onto the cover plate layer in a direction away from the cover plate layer, and the adhesive covers each of edges of the polarizer, the display film, the back film and the heat dissipation layer; wherein the polarizer, the display film, the back film and the heat dissipation layer each comprise a first bending portion and a first non-bending portion, the cover plate layer comprises a second bending portion and a second non-bending portion, and an edge of the screen film layer and an edge of the cover plate layer are arranged adjacent to the first bending portion of the screen film layer and the second bending portion of the cover plate layer respectively. ### Claim 2 (depends on 1) The flexible display panel according to claim 1, wherein projections of at least two film layers of the plurality of film layers onto the cover plate layer partially overlap each other. ### Claim 3 (depends on 1) The flexible display panel according to claim 1, wherein in a case where the screen film layer comprises a polarizer, a display film and a back film laminated one on another in a direction away from the cover plate layer, and the adhesive is arranged between the back film and the cover plate layer and covers each of edges of the polarizer and the display film. ### Claim 4 (depends on 1) The flexible display panel according to claim 1, wherein in a case where the screen film layer comprises a polarizer, a display film, a back film and a heat dissipation layer laminated one on another in a direction away from the cover plate layer, and the adhesive is arranged between the heat dissipation layer and the cover plate layer and covers each of edges of the polarizer, the display film and the back film. ### Claim 5 A method for forming a flexible display panel, wherein the flexible display panel comprises a cover plate layer and a screen film layer, and the screen film layer comprises a plurality of film layers, wherein the method comprises: attaching the plurality of film layers sequentially onto one side of the cover plate layer; and applying an adhesive into a gap between an edge of an outermost film layer of the screen film layer relative to the cover plate layer and the cover plate layer; wherein the screen film layer comprises a polarizer, a display film, a back film and a heat dissipation layer sequentially laminated one on another onto the cover plate layer in a direction away from the cover plate layer, prior to applying the adhesive into the gap between the edge of the outermost film layer of the screen film layer relative to the cover plate layer and the cover plate layer, the method further comprises: bending the cover plate layer and the screen film layer, wherein the polarizer, the display film, the back film and the heat dissipation layer each comprise a first bending portion and a first non-bending portion, the bent cover plate layer comprises a second bending portion and a second non-bending portion, and an edge of the screen film layer and an edge of the cover plate layer are arranged adjacent to the first bending portion of the screen film layer and the second bending portion of the cover plate layer respectively; wherein the applying the adhesive into the gap between the edge of the outermost film layer of the screen film layer relative to the cover plate layer and the cover plate layer comprises: applying the adhesive into a gap between an edge of the heat dissipation layer and the cover plate layer in such a manner that the adhesive covers each of edges of the polarizer, the display film, the back film and the heat dissipation layer. ### Claim 6 (depends on 5) The method according to claim 5, wherein projections of at least two film layers of the plurality of film layers onto the cover plate layer partially overlap each other. ### Claim 7 (depends on 5) The method according to claim 5, wherein in a case where the screen film layer comprises a polarizer, a display film and a back film laminated one on another in a direction away from the cover plate layer, wherein the applying the adhesive into the gap between the edge of the outermost film layer of the screen film layer relative to the cover plate layer and the cover plate layer comprises: applying the adhesive into a gap between an edge of the back film and the cover plate layer in such a manner that the adhesive covers each of edges of the polarizer and the display film; wherein the screen film layer further comprises a heat dissipation layer, and the method further comprises attaching the heat dissipation layer onto a side of the back film away from the cover plate layer. ### Claim 8 (depends on 5) The method according to claim 5, wherein in a case where the screen film layer comprises a polarizer, a display film and a back film laminated one on another in a direction away from the cover plate layer, wherein the applying the adhesive into the gap between the edge of the outermost film layer of the screen film layer relative to the cover plate layer and the cover plate layer comprises: applying the adhesive into a gap between an edge of the back film and the cover plate layer in such a manner that the adhesive covers each of edges of the polarizer, the display film and the back film; wherein the screen film layer further comprises a heat dissipation layer, and the method further comprises attaching the heat dissipation layer onto a side of the back film away from the cover plate layer in such a manner that the adhesive is arranged between the heat dissipation layer and the cover plate layer. ### Claim 9 (depends on 5) The method according to claim 5, wherein after the application of the adhesive, the method further comprises irradiating the adhesive with ultraviolet. ### Claim 10 An adhesive application device for a method for forming a flexible display panel, wherein the flexible display panel comprises a cover plate layer and a screen film layer, and the screen film layer comprises a plurality of film layers laminated one on another at one side of the cover plate layer, wherein the adhesive application device comprises a position capturing unit and an adhesive application mechanism, the position capturing unit is configured to obtain position information about an edge of an outermost film layer of the screen film layer relative to the cover plate layer and directly or indirectly transmit the position information to the adhesive application mechanism, and the adhesive application mechanism is configured to apply an adhesive into a gap between the edge of the outermost film layer of the screen film layer relative to the cover plate layer and the cover plate layer; wherein the screen film layer comprises a polarizer, a display film, a back film and a heat dissipation layer sequentially laminated one on another onto the cover plate layer in a direction away from the cover plate layer, and the adhesive covers each of edges of the polarizer, the display film, the back film and the heat dissipation layer; wherein the polarizer, the display film, the back film and the heat dissipation layer each comprise a first bending portion and a first non-bending portion, the cover plate layer comprises a second bending portion and a second non-bending portion, and an edge of the screen film layer and an edge of the cover plate layer are arranged adjacent to the first bending portion of the screen film layer and the second bending portion of the cover plate layer respectively. ### Claim 11 (depends on 10) The adhesive application device according to claim 10, wherein when a bending angle at a bending portion of the flexible display panel is smaller than or equal to 90°, the position capturing unit is directly aligned with the edge of the outermost film layer of the screen film layer relative to the cover plate layer to capture the position information about the edge of the outermost film layer of the screen film layer relative to the cover plate layer. ### Claim 12 (depends on 10) The adhesive application device according to claim 10, wherein when a bending angle at a bending portion of the flexible display panel is 180°, the position capturing unit is configured to capture the position information about the edge of the outermost film layer of the screen film layer relative to the cover plate layer through a reflector. ### Claim 13 (depends on 10) The adhesive application device according to claim 10, wherein when a bending angle at a bending portion of the flexible display panel is greater than 90° and smaller than 180°, the position capturing unit is directly aligned with the edge of the screen film layer to capture the position information about the edge of the outermost film layer of the screen film layer relative to the cover plate layer, or the position capturing unit is configured to capture the position information about the edge of the outermost film layer of the screen film layer relative to the cover plate layer through a reflector. ### Claim 14 (depends on 12) The adhesive application device according to claim 12, wherein the reflector has a planar or curved surface, or a surface having at least two linear portions. ### Claim 15 (depends on 10) The adhesive application device according to claim 10, wherein the adhesive application mechanism is a one-piece or split-type mechanism.