# US 10,770,667 B2 · Flexible display device and manufacturing method thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,770,667 B2 - Document ID: US10770667B2 - Status: Granted - Kind: B2 - Application number: 16/308,823 - Filed: 2018-09-20 - Published: 2020-02-27 - Granted: 2020-09-08 - Earliest claimed: 2018-08-21 - Assignees: Wuhan China Star Optoelectronics Semiconductor Display Technology Co., Ltd. - Applicants: Wuhan China Star Optoelectronics Semiconductor Display Technology Co., Ltd. - Inventors: Shasha Li; Shoucheng Wang - Web page: https://patentgrep.com/patent/US10770667B2 ## CPC - H10K 59/131: Interconnections, e.g. wiring lines or terminals - H05K 1/0281: {Reinforcement details thereof} - H05K 1/0393: {Flexible materials (H05K1/038 takes precedence; specific organic compositions are classified in H05K1/0313 and subgroups)} - H05K 3/4691: {Rigid-flexible multilayer circuits comprising rigid and flexible layers, e.g. having in the bending regions only flexible layers} - H10K 77/111: {Flexible substrates} - H10K 59/12: Active-matrix OLED [AMOLED] displays - H10K 59/124: Insulating layers formed between TFT elements and OLED elements - H10K 2102/311: {Flexible OLED} - H10K 2102/341: {Short-circuit prevention} - Y02E 10/549: Organic PV cells - H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES - H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract A flexible display device is provided, including: a display area, a bending area, and a driving printed circuit board. The bending area is located between the display area and the driving printed circuit board, and the driving printed circuit board is located on a rear side of the display area by bending of the bending area. The bending area includes: a substrate; an inorganic layer disposed on the substrate, where the inorganic layer is disposed on the substrate and distributed in a form of islands, and the inorganic layer includes a plurality of island-shaped blocks, and two adjacent island-shaped blocks are spaced apart from each other; and a first metal layer disposed on a whole surface of the inorganic layer and the substrate, where the first metal layer forms a plurality of first recesses corresponding to shapes of the plurality of island-shaped blocks. ## Claims ### Claim 1 A flexible display device, comprising: a display area, a bending area, and a driving printed circuit board, wherein the bending area is located between the display area and the driving printed circuit board, and the driving printed circuit board is located on a rear side of the display area by bending of the bending area, and the bending area comprises: a substrate; an inorganic layer disposed on the substrate, wherein the inorganic layer is disposed on the substrate and distributed in a form of islands, and the inorganic layer comprises a plurality of island-shaped blocks, and two adjacent island-shaped blocks are spaced apart from each other; a first metal layer disposed over a whole surface of the inorganic layer and the substrate, wherein the first metal layer forms a plurality of first recesses corresponding to shapes of the plurality of island-shaped blocks; and a second metal layer disposed between the first metal layer and the substrate; and wherein the second metal layer is formed from a plurality of patterning units, and the plurality, of patterning units are spaced apart from each other, and one of the patterning units is located between two adjacent island-shaped blocks. ### Claim 2 (depends on 1) The flexible display device as claimed in claim 1, wherein distances between the plurality of island-shaped blocks are different, and a distance between two adjacent island-shaped blocks located in a center of the bending area is greater than a distance between two adjacent island-shaped blocks located on both sides of the bending area. ### Claim 3 (depends on 1) The flexible display device as claimed in claim 1, wherein a material of the first metal layer in the bending area is the same as a material of a source/drain region in the display area. ### Claim 4 (depends on 1) The flexible display device as claimed in claim 1, wherein the bending area of the flexible display device further comprises an organic planarization layer disposed on the first metal layer, and the organic planarization layer covers the first metal layer and fills the plurality of first recesses. ### Claim 5 (depends on 1) The flexible display device as claimed in claim 1, wherein a material of the second metal layer in the bending area is the same as a material of a gate in the display area. ### Claim 6 A flexible display device, comprising: a display area, a bending area, and a driving printed circuit board, wherein the bending area is located between the display area and the driving printed circuit board, and the driving printed circuit board is located on a rear side of the display area by bending of the bending area, and the bending area comprises: a substrate; an inorganic layer disposed on substrate, wherein the inorganic layer is disposed on the substrate and distributed in a form of islands, and the inorganic layer comprises a plurality of island-shaped blocks, and two adjacent island-shaped blocks are spaced apart from each other; a first metal layer disposed on a whole surface of the inorganic layer and the substrate, wherein the first metal layer forms a plurality of first recesses corresponding to shapes of the plurality of island-shaped blocks; an organic disposed on the first metal layer, and the organic layer fills the plurality of first recesses; and a patterning dielectric layer disposed on the first metal layer and the organic layer, and the patterning dielectric layer is formed at a position corresponding to the plurality of island-shaped blocks of the inorganic layer. ### Claim 7 (depends on 6) The flexible display device as claimed in claim 6, wherein the bending area of the flexible display device further comprises a second metal layer, and the second metal layer is disposed on a whole surface of the patterning dielectric layer and the organic layer, and the second metal layer forms a plurality of second recesses corresponding to a shape of the patterning dielectric layer. ### Claim 8 (depends on 7) The flexible display device as claimed in claim 7, wherein the bending area of the flexible display device further comprises an organic planarization layer disposed on the second metal layer, and the organic planarization layer convers the second metal layer and fills the plurality of second recesses. ### Claim 9 A manufacturing method of a flexible display device, wherein a display area, a bending area, and a driving printed circuit board are defined within the flexible display device, the bending area is located between the display area and the driving printed circuit board, and the driving printed circuit board is located on a rear side of the display area by bending of the bending area, and the manufacturing method comprises: providing a substrate; disposing an inorganic layer on the substrate; patterning the inorganic layer, wherein in the bending area the inorganic layer is disposed on the substrate and distributed in a form of islands, and the inorganic layer comprises a plurality of island-shaped blocks, and two adjacent island-shaped blocks are spaced apart from each other; disposing a second metal layer on the inorganic layer; patterning the second metal layer, such that the second metal layer comprises a plurality of patterning units, and the plurality of patterning units are spaced apart from each other, and one of the patterning units is located between two adjacent island-shaped blocks; and disposing a first metal layer on the inorganic layer and the second metal layer, wherein in the bending area the first metal layer forms a plurality of first recesses corresponding to shapes of the plurality of island-shaped blocks. ### Claim 10 (depends on 9) The manufacturing method of the flexible display device as claimed in claim 9, wherein distances between the plurality of island-shaped blocks are different, and a distance between two adjacent island-shaped blocks located in a center of the bending area is greater than a distance between two adjacent island-shaped blocks located on both sides of the bending area. ### Claim 11 (depends on 9) The manufacturing method of the flexible display device as claimed in claim 9, wherein in the step of disposing the first metal layer on the inorganic layer, a source/drain region in the display area is simultaneously formed. ### Claim 12 (depends on 9) The manufacturing method of the flexible display device as claimed in claim 9, wherein after the step of disposing the first metal layer on the inorganic layer, the method further comprising: disposing an organic planarization layer on the first metal layer, wherein the organic planarization layer covers the first metal layer and fills the plurality of the first recesses. ### Claim 13 (depends on 9) The manufacturing method of the flexible display device as claimed in claim 9, wherein in the step of disposing the second metal layer on the inorganic layer and the step of patterning the second metal layer, a gate in the display area is simultaneously formed.