# US 11,307,349 B2 · Backlight module and display module > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,307,349 B2 - Document ID: US11307349B2 - Status: Granted - Kind: B2 - Application number: 16/632,110 - Filed: 2019-11-14 - Published: 2021-12-30 - Granted: 2022-04-19 - Earliest claimed: 2019-07-29 - Assignees: Wuhan China Star Optoelectronics Technology Co., Ltd. - Applicants: Wuhan China Star Optoelectronics Technology Co., Ltd. - Inventors: Hua Gu - Web page: https://patentgrep.com/patent/US11307349B2 ## CPC - G02B 6/0088: {of the light guide or other optical sheets in the package} - G02B 6/0083: {Details of electrical connections of light sources to drivers, circuit boards, or the like} - G02B 6/009: {of the light source in the package (G02B6/0021 takes precedence)} - G02B 6/0091: {of the light source relative to the light guide (G02B6/0021 takes precedence)} - G02F 1/133615: {Edge-illuminating devices, i.e. illuminating from the side} - 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 ## Abstract A backlight module and a display module are provided. The backlight module includes a back plate, a light guide plate, and a light source. The back plate includes a receiving cavity. One side of the back plate is formed with a through hole. The light guide plate is disposed in the receiving cavity. A light incident surface of the light guide plate corresponds to the through hole, the light source is disposed in the through hole, and the light source corresponds to the light incident surface of the light guide plate. By forming the through hole on one side of the back plate and providing the light source in the through hole, a side frame is not required to be provided, a thickness of a frame of the backlight module is reduced, and a narrow frame is realized. ## Claims ### Claim 1 A backlight module, comprising: a back plate comprising a receiving cavity disposed therein, wherein a side of the back plate is provided with a through hole; a light guide plate disposed in the receiving cavity, wherein a light incident surface of the light guide plate corresponds to the through hole; and a light source disposed in the through hole, wherein the light source corresponds to the light incident surface of the light guide plate; wherein the back plate comprises a bottom plate, a top plate, and a first side plate and a second side plate that are oppositely disposed, the bottom plate, the first side plate, the second side plate, and the top plate are connected to each other to form the through hole. ### Claim 2 (depends on 1) The backlight module according to claim 1, wherein the top plate is formed separately from other portions of the back plate. ### Claim 3 (depends on 1) The backlight module according to claim 1, wherein a distance between the light incident surface of the light guide plate and a second side surface of the bottom plate is greater than or equal to a length of the light source. ### Claim 4 (depends on 1) The backlight module according to claim 1, wherein a height of the light guide plate is greater than or equal to a height of the light source. ### Claim 5 (depends on 1) The backlight module according to claim 1, wherein a first side surface of the top plate is flush with a second side surface of the bottom plate. ### Claim 6 (depends on 1) The backlight module according to claim 1, further comprising a black and white double-sided tape disposed on a light emitting surface of the light guide plate and corresponding to the top plate. ### Claim 7 A display module, comprising: a backlight module comprising a back plate, a light guide plate, and a light source, wherein the back plate comprises a receiving cavity disposed therein, a side of the back plate is provided with a through hole, the light guide plate is disposed in the receiving cavity, a light incident surface of the light guide plate corresponds to the through hole, the light source is disposed in the through hole, and the light source corresponds to the light incident surface of the light guide plate; a display panel disposed in a light emitting direction of the backlight module; and a flexible circuit board bound to the display panel and bent to a bottom surface of the back plate to be attached to the through hole and the bottom surface of the back plate; wherein the light source is disposed on a side of the flexible circuit board adjacent to the back plate; wherein the back plate comprises a bottom plate, a top plate, and a first side plate and a second side plate that are oppositely disposed, the bottom plate, the first side plate, the second side plate, and the top plate are connected to each other to form the through hole. ### Claim 8 (depends on 7) The display module according to claim 7, wherein the top plate is formed separately from other portions of the back plate. ### Claim 9 (depends on 7) The display module according to claim 7, wherein a distance between the light incident surface of the light guide plate and a second side surface of the bottom plate is greater than or equal to a length of the light source. ### Claim 10 (depends on 7) The display module according to claim 7, wherein a height of the light guide plate is greater than or equal to a height of the light source. ### Claim 11 (depends on 7) The display module according to claim 7, wherein a first side surface of the top plate is flush with a second side surface of the bottom plate. ### Claim 12 (depends on 7) The display module according to claim 7, wherein the backlight further comprises a black and white double-sided tape disposed on a light emitting surface of the light guide plate and corresponding to the top plate. ### Claim 13 (depends on 7) The display module according to claim 7, further comprising an adhesive layer disposed on a side of the flexible circuit board adjacent to the back plate and located at two sides of the light source, wherein the adhesive layer is configured to bond the back plate and the flexible circuit board. ### Claim 14 (depends on 7) The display module according to claim 7, wherein the flexible circuit board comprises a reflective area disposed around the light source, and the reflective area is provided with a reflective film. ### Claim 15 (depends on 7) The display module according to claim 7, further comprising a reinforcing plate disposed on a side of the flexible circuit board away from the back plate and corresponding to the light source. ### Claim 16 (depends on 15) The display module according to claim 15, wherein the reinforcing plate is made of metal. ### Claim 17 (depends on 7) The display module according to claim 7, further comprising a driving chip disposed on a side of the flexible circuit board adjacent to the back plate and attached to the bottom surface of the back plate.