# US 11,906,776 B2 · Backlight module and display device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,906,776 B2 - Document ID: US11906776B2 - Status: Granted - Kind: B2 - Application number: 18/036,859 - Filed: 2020-11-17 - Published: 2023-12-21 - Granted: 2024-02-20 - Earliest claimed: 2020-11-17 - Assignees: Hefel BOE Display Lighting Co., Ltd.; Boe Technology Group Co., Ltd. - Applicants: Hefei BOE Display Lighting Co., Ltd.; BOE Technology Group Co., Ltd. - Inventors: Qiping Zhang - Web page: https://patentgrep.com/patent/US11906776B2 ## CPC - G02B 6/009: {of the light source in the package (G02B6/0021 takes precedence)} - G02B 6/0083: {Details of electrical connections of light sources to drivers, circuit boards, or the like} - G02B 6/0088: {of the light guide or other optical sheets in the package} - G02B 6/0091: {of the light source relative to the light guide (G02B6/0021 takes precedence)} - G02F 1/1336: {Illuminating devices} - H05K 1/189: characterised by the use of flexible or folded printed circuits - H05K 2201/10106: Light emitting diode [LED] - H05K 2201/10128: Display - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - 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 - H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS ## Abstract A backlight module includes a backplane, a light guide plate, a light bar assembly, and fixing adhesive tape. The backplane includes a bottom plate, a counter plate and a side plate connected to form an accommodating space. The light guide plate is in the accommodating space. The light bar assembly is in a U-shaped slot of the backplane and comprises a flexible circuit board and a light-emitting component. The flexible circuit board is on a side of the light guide plate facing away from the bottom plate, and the light-emitting component is at a side surface of the light guide plate. The fixing adhesive tape is between the counter plate and the flexible circuit board. The orthographic projection of the fixing adhesive tape on the bottom plate does not overlap the orthographic projection of the light-emitting component on the bottom plate. ## Claims ### Claim 1 A backlight module, comprising: a backplane comprising: a bottom plate; a counter plate opposite to the bottom plate; and a side plate connecting the bottom plate and the counter plate; wherein a part of the side plate connected to the bottom plate is arc-shaped, and the bottom plate, the side plate and the counter plate are connected to form an accommodating space and form a U-shaped slot at an end; a light guide plate in the accommodating space of the backplane; a light bar assembly, located in the U-shaped slot and comprising: a flexible circuit board; and a light-emitting component fixed to the flexible circuit board; wherein the flexible circuit board is on a side, facing away from the bottom plate, of the light guide plate, and the light-emitting component is at a side surface of the light guide plate; and fixing adhesive tape between the counter plate and the flexible circuit board; wherein the flexible circuit board is attached to the counter plate through the fixing adhesive tape, and an orthographic projection of the fixing adhesive tape on the bottom plate does not overlap an orthographic projection of the light-emitting component on the bottom plate. ### Claim 2 (depends on 1) The backlight module according to claim 1, wherein: the flexible circuit board comprises: a first portion overlapping the light-emitting component; a second portion extending out of the first portion along a side towards the light guide plate; and a third portion extending out of the first portion along a side towards the side plate; wherein the flexible circuit board is glued to the fixing adhesive tape at the second portion so as to be attached to the counter plate. ### Claim 3 (depends on 2) The backlight module according to claim 2, wherein: the second portion comprises: an overlapping portion overlapping the fixing adhesive tape; and an extending portion extending from the overlapping portion along a side towards the light-emitting component. ### Claim 4 (depends on 3) The backlight module according to claim 3, wherein in a direction pointing to the light guide plate from the light-emitting component, a length of the extending portion is 0.5 mm to 1 mm. ### Claim 5 (depends on 3) The backlight module according to claim 3, wherein: spacing between a surface of the first portion facing away from the light-emitting component and a first surface is equal to spacing between a surface of the overlapping portion facing away from the light guide plate and the first surface; wherein the first surface is a surface of the counter plate facing the bottom plate. ### Claim 6 (depends on 3) The backlight module according to claim 3, wherein: spacing between a surface of the first portion facing away from the light-emitting component and a first surface is greater than spacing between a surface of the overlapping portion facing away from the light guide plate and the first surface; wherein the first surface is a surface of the counter plate facing the bottom plate. ### Claim 7 (depends on 1) The backlight module according to claim 1, wherein: the fixing adhesive tape comprises: a first adhesive body, a first base material and a second adhesive body which are stacked. ### Claim 8 (depends on 7) The backlight module according to claim 7, further comprising: pad adhesive tape on a side of the counter plate facing away from the bottom plate. ### Claim 9 (depends on 8) The backlight module according to claim 8, wherein: the pad adhesive tape comprises: a second base material. ### Claim 10 (depends on 9) The backlight module according to claim 9, further comprising: a fourth base material connected to the first base material and the second base material; wherein the first base material, the second base material and the fourth base material are of an integrated structure. ### Claim 11 (depends on 10) The backlight module according to claim 10, wherein a thickness of the pad adhesive tape in a direction perpendicular to the bottom plate is greater than a thickness of the fixing adhesive tape in the direction perpendicular to the bottom plate. ### Claim 12 (depends on 10) The backlight module according to claim 10, wherein: the pad adhesive tape further comprises: a third adhesive body between the counter plate and the second base material, a fourth adhesive body on a side of the second base material facing away from the counter plate, and a third base material on a side of the fourth adhesive body facing away from the second base material. ### Claim 13 (depends on 1) The backlight module according to claim 1, further comprising: an optical film on a side of the light guide plate facing away from the bottom plate; wherein a gap exists between an end of the optical film facing the U-shaped slot and an end of the counter plate. ### Claim 14 (depends on 1) A display device, comprising: the backlight module according to claim 1; and a display panel on a light-exit side of the backlight module.