# US 10,481,423 B2 · Cover window and foldable display device including the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,481,423 B2 - Document ID: US10481423B2 - Status: Granted - Kind: B2 - Application number: 15/812,258 - Filed: 2017-11-14 - Published: 2018-05-31 - Granted: 2019-11-19 - Earliest claimed: 2016-11-30 - Assignees: LG Display Co., Ltd. - Applicants: LG Display Co., Ltd. - Inventors: Kelly Soo Yeun Song; Jae-Hyoung Park; Yu-Lim Won - Web page: https://patentgrep.com/patent/US10481423B2 ## CPC - G02F 1/133305: {Flexible substrates, e.g. plastics, organic film} - G02F 1/133308: {Support structures for LCD panels, e.g. frames or bezels} - G06F 1/1652: {the display being flexible, e.g. mimicking a sheet of paper, or rollable} - G09F 9/301: {flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED} - H10K 77/111: {Flexible substrates} - G02B 6/0055: {Reflecting element, sheet or layer} - G02F 1/133331: {Cover glasses} - G02F 1/133528: {Polarisers} - G02F 1/1337: Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers - G02F 1/134309: {characterised by their geometrical arrangement} - G02F 1/134363: {for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]} - G02F 1/1368: in which the switching element is a three-electrode device {(G02F1/136277 takes precedence)} - G02F 2201/121: common or background - G02F 2201/123: pixel - G02F 2201/124: interdigital - G02F 2202/36: Micro- or nanomaterials - H10K 59/12: Active-matrix OLED [AMOLED] displays - H10K 59/80518: {Reflective anodes, e.g. ITO combined with thick metallic layers} - H10K 59/8052: {Cathodes} - H10K 59/871: {Self-supporting sealing arrangements} - H10K 59/8791: {Arrangements for improving contrast, e.g. preventing reflection of ambient light} - H10K 2102/103: {comprising indium oxides, e.g. ITO} - H10K 2102/3026: {Top emission} - H10K 2102/311: {Flexible OLED} - H10K 2102/331: {Nanoparticles used in non-emissive layers, e.g. in packaging layer} - Y02E 10/549: Organic PV cells - G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) - G09F: DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS - H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract The present invention provides a cover window including a first region having a first stiffness; a second region having a second stiffness being greater than the first stiffness; and a nano-particle in a boundary between the first and second regions. ## Claims ### Claim 1 A cover window, comprising: a first region having a first stiffness; a second region having a second stiffness greater than the first stiffness, the second region including a first portion and a second portion, wherein the first portion is closer to the first region than the second portion; and a nano-particle in the first portion and not in the second portion, wherein the first region has a first thickness, and the nano-particle is positioned within the first region at a second thickness smaller than the first thickness. ### Claim 2 (depends on 1) The cover window according to claim 1, wherein the first region includes a pattern region and a non-pattern region at a periphery of the pattern region, and the nano-particle is positioned in one of the pattern region and the non-pattern region except the other one of the pattern region and the non-pattern region. ### Claim 3 (depends on 1) The cover window according to claim 1, wherein the nano-particle has a size of about 50 to 500 nm. ### Claim 4 (depends on 1) The cover window according to claim 1, wherein the nano-particle has a weight % of about 1 to 10 in a region including the nano-particle. ### Claim 5 (depends on 1) The cover window according to claim 1, wherein the first region includes a pattern region and a non-pattern region at a periphery of the pattern region, and wherein the nano-particle has a first density in the pattern region and a second density in the non-pattern region, and the first density is different from the second density. ### Claim 6 (depends on 5) The cover window according to claim 5, wherein one of the first and second density is 0. ### Claim 7 (depends on 5) The cover window according to claim 5, wherein the first density is greater than the second density, and wherein when the cover window is folded, the pattern region has a first transmittance, and the non-pattern region has a second transmittance being greater than the first transmittance. ### Claim 8 (depends on 5) The cover window according to claim 5, wherein the first density is smaller than the second density, and wherein when the cover window is folded, the pattern region has a first transmittance, and the non-pattern region has a second transmittance being smaller than the first transmittance. ### Claim 9 (depends on 5) The cover window according to claim 5, wherein the first density is greater than the second density, and wherein when the cover window is folded, the pattern region has a first haze, and the non-pattern region has a second haze being greater than the first transmittance. ### Claim 10 (depends on 5) The cover window according to claim 5, wherein the first density is smaller than the second density, and wherein when the cover window is folded, the pattern region has a first haze, and the non-pattern region has a second haze being smaller than the first transmittance. ### Claim 11 A cover window, comprising: a first region having a first stiffness and including a pattern region and a non-pattern region at a periphery of the pattern region; a second region having a second stiffness greater than the first stiffness; and a nano-particle in the first region, wherein the nano-particle has a first density in the pattern region and a second density in the non-pattern region, and the first density is different from the second density, wherein the cover window has a single-layered structure, wherein the first region has a first thickness, and the nano-particle is positioned within the first region at a second thickness smaller than the first thickness. ### Claim 12 (depends on 11) The cover window according to claim 11, wherein one of the first and second density is 0. ### Claim 13 (depends on 11) The cover window according to claim 11, wherein the first density is greater than the second density, and wherein when the cover window is folded, the pattern region has a first transmittance, and the non-pattern region has a second transmittance being greater than the first transmittance. ### Claim 14 (depends on 11) The cover window according to claim 11, wherein the first density is smaller than the second density, and wherein when the cover window is folded, the pattern region has a first transmittance, and the non-pattern region has a second transmittance being smaller than the first transmittance. ### Claim 15 (depends on 11) The cover window according to claim 11, wherein the first density is greater than the second density, and wherein when the cover window is folded, the pattern region has a first haze, and the non-pattern region has a second haze being greater than the first transmittance. ### Claim 16 (depends on 11) The cover window according to claim 11, wherein the first density is smaller than the second density, and wherein when the cover window is folded, the pattern region has a first haze, and the non-pattern region has a second haze being smaller than the first transmittance. ### Claim 17 (depends on 11) The cover window according to claim 11, wherein the nano-particle has a size of about 50 to 500 nm. ### Claim 18 A foldable display device, comprising: a display panel; and a cover window on a display side of the display panel, the cover window including: a first region having a first stiffness; a second region having a second stiffness greater than the first stiffness, the second region including a first portion and a second portion, wherein the first portion is closer to the first region than the second portion; and a nano-particle in the first portion and not in the second portion, wherein the cover window has a single-layered structure, wherein the first region has a first thickness, and the nano-particle is positioned within the first region at a second thickness smaller than the first thickness. ### Claim 19 A foldable display device, comprising: a display panel; and a cover window on a display side of the display panel, the cover window including: a first region having a first stiffness and including a pattern region and a non-pattern region at a periphery of the pattern region; a second region having a second stiffness greater than the first stiffness; and a nano-particle in the first region, wherein the nano-particle has a first density in the pattern region and a second density in the non-pattern region, and the first density is different from the second density, wherein the cover window has a single-layered structure, wherein the first region has a first thickness, and the nano-particle is positioned within the first region at a second thickness smaller than the first thickness.