# US 12,007,805 B2 · Foldable display panel and manufacturing method of foldable display panel > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,007,805 B2 - Document ID: US12007805B2 - Status: Granted - Kind: B2 - Application number: 17/637,089 - Filed: 2022-01-11 - Published: 2023-07-13 - Granted: 2024-06-11 - Earliest claimed: 2021-12-28 - Assignees: Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd. - Applicants: Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd. - Inventors: Kang Liu; Baixiang Han - Web page: https://patentgrep.com/patent/US12007805B2 ## CPC - G06F 1/1616: {with folding flat displays, e.g. laptop computers or notebooks having a clamshell configuration, with body parts pivoting to an open position around an axis parallel to the plane they define in closed position} - G06F 1/1641: {the display being formed by a plurality of foldable display components (G06F1/1647 takes precedence)} - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) ## Abstract A foldable display panel and a manufacturing method of the display panel are provided. A plurality of photo spacers are disposed in a first region of the foldable display panel, i.e., the plurality of photo spacers are disposed at a folded position. Widths of the photo spacers gradually decrease from a flexible substrate to a direction away from the flexible substrate. When the foldable display panel is folded, the photo spacers can cooperate with a folding curve to contact with each other, thereby reducing extrusion between the plurality of photo spacers. ## Claims ### Claim 1 A foldable display panel, comprising: a flexible substrate, wherein the flexible substrate has a first region and second regions, the flexible substrate has at least two of the second regions, the first region is defined between adjacent two of the second regions, and the first region is a folded region; display screens, wherein the display screens are disposed in the second regions; a plurality of photo spacers, wherein the photo spacers are disposed in the first region, and widths of the photo spacers gradually decrease from the flexible substrate to a direction away from the flexible substrate; wherein the display screens comprise a passivation layer, a planarization layer, and a pixel definition layer disposed in a stack sequentially, and wherein the photo spacers comprise at least one layer of the passivation layer, the planarization layer, or the pixel definition layer. ### Claim 2 (depends on 1) The foldable display panel as claimed in claim 1, wherein a material of the photo spacers is an organic photoresist material. ### Claim 3 (depends on 1) The foldable display panel as claimed in claim 1, wherein a bumpy surface is formed on a side of the plurality of photo spacers away from the flexible substrate; and when the foldable display panel is folded, the bumpy surface is folded to form a stress space. ### Claim 4 (depends on 3) The foldable display panel as claimed in claim 3, wherein heights of the plurality of photo spacers are not equal; and when the foldable display panel is folded, the stress space is formed between the photo spacers. ### Claim 5 (depends on 4) The foldable display panel as claimed in claim 4, wherein the photo spacers comprise first photo spacers and second photo spacers, the first photo spacers have a first height, the second photo spacers have a second height, the first height and the second height are not equal, and the first photo spacers and the second photo spacers are disposed alternately. ### Claim 6 (depends on 1) The foldable display panel as claimed in claim 1, wherein a first bumpy structure is disposed on a lateral wall of the first photo spacers, and a second bumpy structure is disposed on a lateral wall of the second photo spacers, and wherein when the foldable display panel is folded, the first bumpy structure engages with the second bumpy structure. ### Claim 7 (depends on 4) The foldable display panel as claimed in claim 4, wherein the photo spacers comprise a plurality of photo spacer groups, one of the photo spacer groups comprises at least three photo spacers with different heights. ### Claim 8 (depends on 3) The foldable display panel as claimed in claim 3, wherein heights of the plurality of photo spacers are same; and when the foldable display panel is folded, the stress space is formed between the photo spacers. ### Claim 9 (depends on 1) The foldable display panel as claimed in claim 1, wherein widths of a side of the plurality of photo spacers away from the flexible substrate are same or different, and widths of a side of the plurality of photo spacers close to the flexible substrate are same or different. ### Claim 10 (depends on 9) The foldable display panel as claimed in claim 9, wherein the widths of the side of the photo spacers close to the flexible substrate range from 3 μm to 12 μm. ### Claim 11 (depends on 9) The foldable display panel as claimed in claim 9, wherein the widths of the photo spacers gradually increase along a direction of a center of the first region close toward the display screens. ### Claim 12 (depends on 1) The foldable display panel as claimed in claim 1, wherein a width of the first region ranges from 3 μm to 6 μm, and a height of the display screens does not exceed 6 μm. ### Claim 13 (depends on 1) The foldable display panel as claimed in claim 1, wherein heights of the photo spacers are not less than a half of a height of the display screens and do not exceed twice of the height of the display screens. ### Claim 14 (depends on 1) The foldable display panel as claimed in claim 1, wherein heights of the photo spacers are less than a height of the display screens. ### Claim 15 (depends on 1) The foldable display panel as claimed in claim 1, wherein an elastic layer is disposed on the flexible substrate, and the photo spacers are disposed on the elastic layer. ### Claim 16 A foldable display panel, comprising: a flexible substrate, wherein the flexible substrate has a first region and second regions, the flexible substrate has at least two of the second regions, the first region is defined between adjacent two of the second regions, and the first region is a folded region; display screens, wherein the display screens are disposed in the second regions; a plurality of photo spacers, wherein the photo spacers are disposed in the first region, widths of the photo spacers gradually decrease from the flexible substrate to a direction away from the flexible substrate, and a material of the photo spacers is an organic photoresist material, and wherein a bumpy surface is formed on a side of the plurality of photo spacers away from the flexible substrate; and when the foldable display panel is folded, the bumpy surface is folded to form a stress space; wherein the display screens comprise a passivation layer, a planarization layer, and a pixel definition layer disposed in a stack sequentially, and wherein the photo spacers comprise at least one layer of the passivation layer, the planarization layer, or the pixel definition layer. ### Claim 17 A manufacturing method of a foldable display panel, comprising: providing a flexible substrate, wherein the flexible substrate has a first region and second regions, the flexible substrate has at least two of the second regions, the first region is defined between adjacent two of the second regions, the foldable display panel is folded in the first region; manufacturing at least two display screens on the flexible substrate, wherein the display screens are disposed in the second regions, and the display screens comprise a passivation layer, a planarization layer, and a pixel definition layer disposed in a stack sequentially; manufacturing photo spacers on the flexible substrate, wherein the photo spacers are disposed in the first region, the photo spacers comprise at least one layer of the passivation layer, the planarization layer, or the pixel definition layer, and widths of the photo spacers gradually decrease from the flexible substrate to a direction away from the flexible substrate. ### Claim 18 (depends on 17) The manufacturing method of the foldable display panel as claimed in claim 17, wherein a material of the photo spacers is an organic photoresist material, and manufacturing the photo spacers on the flexible substrate comprises: manufacturing the flexible substrate in the first region by a photo manner.