# US 2024/0201742 A1 · Foldable Display Device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2024/0201742 A1 - Document ID: US20240201742A1 - Status: Published application - Kind: A1 - Application number: 18/534,515 - Filed: 2023-12-08 - Published: 2024-06-20 - Earliest claimed: 2022-12-19 - Assignees: LG Display Co., Ltd. - Applicants: LG Display Co., Ltd. - Inventors: Seonghyeon Lee; Minwoo Jeon; Jungmin Lee; Hyejeong Park - Web page: https://patentgrep.com/patent/US20240201742A1 ## CPC - G06F 1/1652: {the display being flexible, e.g. mimicking a sheet of paper, or rollable} - H10K 50/865: {comprising light absorbing layers, e.g. light-blocking layers} - H10K 59/126: Shielding, e.g. light-blocking means over the TFTs - H10K 59/38: comprising colour filters or colour changing media [CCM] - H10K 59/8792: {comprising light absorbing layers, e.g. black layers} - H10K 77/111: {Flexible substrates} - H10K 2102/311: {Flexible OLED} - H10K 2102/351: {Thickness} - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) - H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES ## Abstract A foldable display device includes a display panel including a display area and a non-display area, wherein the display panel includes a light-emitting element, an encapsulation layer disposed on the light-emitting element, and color filters disposed on the encapsulation layer; and a cover window assembly disposed on the display panel, wherein the cover window assembly includes a protective film and a multi-functional layer disposed under the protective film, wherein the multi-functional layer includes: a light-transmissive portion overlapping the display area of the display panel; and a light-blocking portion overlapping both the display area and the non-display area of the display panel, wherein the light-blocking portion has a light-transmittance lower than a light-transmittance of the light-transmissive portion. ## Claims ### Claim 1 A foldable display device comprising: a display panel including a display area and a non-display area, wherein the display panel includes a light-emitting element, an encapsulation layer on the light-emitting element, and color filters on the encapsulation layer; and a cover window assembly on the display panel, the cover window assembly including a protective film and a multi-functional layer under the protective film, wherein the multi-functional layer includes: a light-transmissive portion overlapping the display area of the display panel; and a light-blocking portion overlapping both the display area and the non-display area of the display panel, the light-blocking portion having a light-transmittance that is less than a light-transmittance of the light-transmissive portion. ### Claim 2 (depends on 1) The foldable display device of claim 1, wherein the light-blocking portion comprises: an outer light-blocking portion surrounding side surfaces of the light-transmissive portion; and an inner light-blocking portion covering at least one of an upper surface or a lower surface of the light-transmissive portion, wherein a light-transmittance of the inner light-blocking portion is greater than a light-transmittance of the outer light-blocking portion. ### Claim 3 (depends on 2) The foldable display device of claim 2, wherein the light-blocking portion includes a thermoplastic elastomer containing a pigment or dye that render a black color. ### Claim 4 (depends on 3) The foldable display device of claim 3, wherein the light-blocking portion includes a thermoplastic polyurethane containing a black pigment or dye. ### Claim 5 (depends on 3) The foldable display device of claim 3, wherein the light-blocking portion includes a thermoplastic polyurethane containing a red pigment or dye, a green pigment or dye, and a blue pigment or dye. ### Claim 6 (depends on 3) The foldable display device of claim 3, wherein a content of the pigment or dye contained in the outer light-blocking portion of the light-blocking portion is greater than a content of the pigment or dye contained in the inner light-blocking portion of the light-blocking portion. ### Claim 7 (depends on 6) The foldable display device of claim 6, wherein the content of the pigment or dye contained in the outer light-blocking portion of the light-blocking portion is in a range of 0.5 wt % to 5 wt %, and the content of the pigment or dye contained in the inner light-blocking portion of the light-blocking portion is in a range of 0.05 wt % to 2 wt %. ### Claim 8 (depends on 3) The foldable display device of claim 3, wherein the outer light-blocking portion of the light-blocking portion includes two layers having different contents of the pigment or dye. ### Claim 9 (depends on 2) The foldable display device of claim 2, wherein a thickness of the outer light-blocking portion of the light-blocking portion is greater than a thickness of the inner light-blocking portion of the light-blocking portion. ### Claim 10 (depends on 9) The foldable display device of claim 9, wherein a thickness of the outer light-blocking portion of the light-blocking portion is in a range of 50 μm to 120 μm, and the thickness of the inner light-blocking portion of the light-blocking portion is in a range of 0.5 μm to 10 μm. ### Claim 11 (depends on 2) The foldable display device of claim 2, wherein a thickness of the inner light-blocking portion of the light-blocking portion is less than a thickness of the light-transmissive portion. ### Claim 12 (depends on 1) The foldable display device of claim 1, wherein the multi-functional layer of the cover window assembly is directly coated on a lower surface of the protective film and is attached to an upper surface of the display panel via an adhesive layer. ### Claim 13 (depends on 1) The foldable display device of claim 1, wherein the cover window assembly further comprises: a cover window between the protective film and the multi-functional layer, wherein the multi-functional layer is directly coated on a lower surface of the cover window and is attached to an upper surface of the display panel via an adhesive layer. ### Claim 14 A foldable display device comprising: a display panel including a light-emitting element, an encapsulation layer on the light-emitting element, and color filters on the encapsulation layer; a protective film on the display panel; and a multi-functional layer between the protective film and the display panel, and the multi-functional layer is attached to an upper surface of the display panel, the multi-functional layer including: a light-transmissive portion having an area size that is smaller than an area size of the display panel; and a light-blocking portion covering at least one of a lower surface or an upper surface of the light-transmissive portion, and side surfaces of the light-transmissive portion, the light-blocking portion having a light-transmittance that is less than a light-transmittance of the light-transmissive portion. ### Claim 15 (depends on 14) The foldable display device of claim 14, wherein the light-blocking portion of the multi-functional layer covers the lower surface and the side surfaces of the light-transmissive portion, and the light-transmissive portion of the multi-functional layer directly contacts a lower surface of the protective film. ### Claim 16 (depends on 14) The foldable display device of claim 14, wherein the light-blocking portion of the multi-functional layer covers the upper surface and the side surfaces of the light-transmissive portion, and the light-blocking portion of the multi-functional layer directly contacts a lower surface of the protective film. ### Claim 17 (depends on 14) The foldable display device of claim 14, wherein the foldable display device further comprises: a cover window between the protective film and the multi-functional layer, wherein the light-blocking portion of the multi-functional layer covers the lower surface and the side surfaces of the light-transmissive portion, and the light-transmissive portion of the multi-functional layer directly contacts a lower surface of the cover window. ### Claim 18 (depends on 14) The foldable display device of claim 14, wherein the foldable display device further comprises: a cover window between the protective film and the multi-functional layer, wherein the light-blocking portion of the multi-functional layer covers the upper surface and the side surfaces of the light-transmissive portion, and the light-blocking portion of the multi-functional layer directly contacts a lower surface of the cover window. ### Claim 19 (depends on 14) The foldable display device of claim 14, wherein the light-blocking portion includes a thermoplastic elastomer containing a pigment or dye that render a black color. ### Claim 20 (depends on 19) The foldable display device of claim 19, wherein the light-blocking portion includes: an outer light-blocking portion surrounding side surfaces of the light-transmissive portion; and an inner light-blocking portion covering at least one of an upper surface or a lower surface of the light-transmissive portion, wherein a content of the pigment or dye contained in the outer light-blocking portion of the light-blocking portion is greater than a content of the pigment or dye contained in the inner light-blocking portion of the light-blocking portion.