# US 2019/0172377 A1 · Flexible display device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0172377 A1 - Document ID: US20190172377A1 - Status: Published application - Kind: A1 - Application number: 16/208,419 - Filed: 2018-12-03 - Published: 2019-06-06 - Earliest claimed: 2017-12-06 - Assignees: LG Display Co., Ltd. - Applicants: LG Display Co., Ltd. - Inventors: JeongHun KIM; PyungYong LEE - Web page: https://patentgrep.com/patent/US20190172377A1 ## CPC - G09F 9/301: {flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED} - 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} - H04M 1/0268: {including a flexible display panel} - G02F 1/133314: {Back frames} - G02F 1/133322: {Mechanical guidance or alignment of LCD panel support components} - Y02E 10/549: Organic PV cells - G09F: DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS - 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) - H04M: TELEPHONIC COMMUNICATION (circuits for controlling other apparatus via a telephone cable and not involving telephone switching apparatus G08) - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract A flexible display device includes a plurality of back bars coupled to the rear surface of a display panel, and a spacing member disposed up to a boundary between a non-display area and a display area such that the display panel can be prevented from being scratched and damaged by friction during the rolling of the display panel. According to the aspects disclosed herein, in a flexible display device capable of implementing a rollable display or a foldable display, when rolling a display panel, it is possible to prevent the display panel from being scratched or damaged. ## Claims ### Claim 1 A flexible display device comprising: a display panel; a cylindrical roller having an outer peripheral surface on which the display panel is rolled and unrolled; a connection member having a first end attached to the outer peripheral surface of the cylindrical roller and a second end connected to an end of the display panel; a plurality of back bars coupled to rear surfaces of the display panel and the connection member and disposed in a horizontal direction with respect to a longer side of the display panel; and a spacing member coupled to a rear surface of the one end of the connection member and disposed from each of both side ends of the connection member to a boundary between a non-display area and a display area of the display panel. ### Claim 2 (depends on 1) The flexible display device of claim 1, further comprising adhesive members provided between the rear surface of the display panel and front surfaces of the back bars, between the rear surface of the connection member and the front surfaces of the back bars, and between the rear surface of the connection member and a front surface of the spacing member. ### Claim 3 (depends on 1) The flexible display device of claim 1, further comprising a fixing member securing the plurality of back bars disposed on the display panel and the connection member with respect to a connection portion where the end of the display panel and the connection member are connected to each other. ### Claim 4 (depends on 3) The flexible display device of claim 3, wherein the fixing member is provided on at least one of outer peripheral surfaces and side surfaces of the plurality of back bars, which are disposed on the display panel and the connection member with respect to the connection member. ### Claim 5 (depends on 1) The flexible display device of claim 1, further comprising a wide back bar having first and second ends with respect to a connection portion where the end of the display panel and the connection member are connected to each other. ### Claim 6 (depends on 5) The flexible display device of claim 5, wherein the first end of the wide back bar is positioned on the display panel and the second end of the wide back bar is positioned on the connection member. ### Claim 7 (depends on 5) The flexible display device of claim 5, wherein the wide back bar has an outer peripheral surface with a convex curved shape. ### Claim 8 A flexible display device comprising: a display panel; a cylindrical roller having an outer peripheral surface on which the display panel is rolled and unrolled; a connection member having a first end fixed to the outer peripheral surface of the cylindrical roller and a second end connected to an end of the display panel; and a plurality of back bars coupled to rear surfaces of the display panel and the connection member and disposed in a horizontal direction with respect to a longer side of the display panel, wherein the plurality of back bars adjacent to the first end of the connection member has a height sequentially reduced toward the first end of connection member. ### Claim 9 (depends on 8) The flexible display device of claim 8, wherein the plurality of back bar includes a back bar disposed closest to the first end of the connection member having a wedge shape with a convex outer surface. ### Claim 10 (depends on 8) The flexible display device of claim 8, further comprising a fixing member respectively securing the plurality of back bars disposed on the display panel and the connection member with respect to a connection portion where the end of the display panel and the connection member are connected to each other. ### Claim 11 (depends on 10) The flexible display device of claim 10, wherein the fixing member is provided on at least one of an outer peripheral surface and a side surface of the plurality of back bars respectively disposed on the display panel and the connection member with respect to the connection member. ### Claim 12 (depends on 8) The flexible display device of claim 8, further comprising a wide back bar having a first end and a second end with respect to a connection portion where the end of the display panel and the connection member are connected to each other, ### Claim 13 (depends on 12) The flexible display device of claim 12, wherein the first end of the wide back bar is disposed on the display panel and the second end of the wide back bar is disposed on the connection member. ### Claim 14 (depends on 12) The flexible display device of claim 12, wherein the wide back bar has an outer peripheral surface with a convex curved shape. ### Claim 15 A flexible display device comprising: a display panel; a cylindrical roller having an outer peripheral surface, around which the display panel is wound; a connection member having a first end fixed to the outer peripheral surface of the cylindrical roller and a second end connected to the display panel; a plurality of back bars coupled to rear surfaces of the display panel and the connection member and disposed in an extending direction of the cylindrical roller; and a fixing member configured to fix at least two adjacent back bars disposed on the display panel and the connection member with respect to a connection portion where the display panel and the connection member are connected to each other, so as to prevent the connection portion from protruding to outside when the connection member and the display panel are wound around the outer peripheral surface of the cylindrical roller. ### Claim 16 (depends on 15) The flexible display device of claim 15, wherein back bars adjacent to the first end of the connection member have heights sequentially lowered toward the first end of connection member. ### Claim 17 (depends on 15) The flexible display device of claim 15, wherein the plurality of back bars includes a back bar disposed closest to the first end of the connection member and having a convex outer surface with a wedge shape inclined towards the first end of the connection member. ### Claim 18 (depends on 15) The flexible display device of claim 15, wherein the fixing member is provided on at least one of an outer peripheral surface and a side surface of the at least two adjacent back bars disposed on the display panel and the connection member with respect to the connection portion. ### Claim 19 A flexible display device comprising: a display panel; a cylindrical roller having an outer peripheral surface, around which the display panel is wound; a connection member having a first end fixed to the outer peripheral surface of the cylindrical roller and a second end connected to the display panel; a plurality of back bars coupled to rear surfaces of the display panel and the connection member and disposed in an extending direction of the cylindrical roller; and a wide back bar having first and second ends with respect to a connection portion where the display panel and the connection member are connected to each other, and disposed in the extending direction of the cylindrical roller. ### Claim 20 (depends on 19) The flexible display device of claim 19, wherein the first end of the wide back bar is disposed on the display panel and the second end of the wide back bar is disposed on the connection member. ### Claim 21 (depends on 20) The flexible display device of claim 20, wherein the wide back bar has an outer peripheral surface with a convex curved shape. ### Claim 22 (depends on 19) The flexible display device of claim 19, wherein back bars adjacent to the first end of the connection member have heights sequentially lowered toward the first end of connection member. ### Claim 23 (depends on 19) The flexible display device of claim 19, wherein the plurality of back bars includes a back bar disposed closest to the first end of the connection member and having a convex outer surface with a wedge shape inclined towards the first end of the connection member.