# US 2021/0333631 A1 · Side-incidence 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 2021/0333631 A1 - Document ID: US20210333631A1 - Status: Published application - Kind: A1 - Application number: 16/328,880 - Filed: 2018-08-07 - Published: 2021-10-28 - Earliest claimed: 2017-10-19 - Assignees: Boe Technology Group Co., Ltd.; Beijing Boe Display Technology Co., Ltd. - Applicants: Boe Technology Group Co., Ltd.; Beijing Boe Display Technology Co., Ltd. - Inventors: Yanjun SUN - Web page: https://patentgrep.com/patent/US20210333631A1 ## CPC - G02F 1/133603: {with LEDs} - G02B 6/0031: {Reflecting element, sheet or layer} - G02B 6/0055: {Reflecting element, sheet or layer} - G02F 1/133605: {including specially adapted reflectors} - G02F 1/133615: {Edge-illuminating devices, i.e. illuminating from the side} - G02B 6/0046: {Tapered light guide, e.g. wedge-shaped light guide} - 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 - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## Abstract A side-incidence backlight module including a light guide plate, a light strip and a light leakage preventing member. The light strip is disposed at a side of a light incident surface of the light guide plate and includes at least one light emitting element. The light leakage preventing member is located between the light strip and the light guide plate and extends along a width direction of the light guide plate. The light leakage preventing member includes at least one groove. An opening of the groove faces the light strip. The at least one light emitting element is at least partially accommodated in the groove. ## Claims ### Claim 1 A side-incidence backlight module comprising: a light guide plate; a light strip arranged at a side of a light incident surface of the light guide plate and comprising at least one light emitting element; and a light leakage preventing member located between the light strip and the light guide plate and extending along a width direction of the light guide plate, wherein the light leakage preventing member comprises at least one groove, an opening of the at least one groove faces the light strip, and the at least one light emitting element is at least partially accommodated in the groove. ### Claim 2 (depends on 1) The side-incidence backlight module according to claim 1, wherein the light leakage preventing member comprises one groove, the groove runs through the light leakage preventing member along a width direction of the light guide plate. ### Claim 3 (depends on 1) The side-incidence backlight module according to claim 1, wherein there are a plurality of light emitting elements, a number of grooves is the same as a number of the light emitting elements, and the light emitting elements correspond to the grooves one by one. ### Claim 4 (depends on 1) The side-incidence backlight module according to claim 1, wherein an upper surface and/or a lower surface of the light leakage preventing member are provided with dots. ### Claim 5 (depends on 1) The side-incidence backlight module according to claim 1, wherein a thickness of the light leakage preventing member is the same as that of the light guide plate, an upper surface of the light leakage preventing member is flush with an upper surface of the light guide plate, and a lower surface of the light leakage preventing member is flush with a lower surface of the light guide plate; a length of the light leakage preventing member is the same as a width of the light guide plate. ### Claim 6 (depends on 1) The side-incidence backlight module according to claim 1, further comprising two reflective films, one of which is attached to an upper surface of the light leakage preventing member and part of an upper surface of the light guide plate at the light leakage preventing member side, and the other of which is attached to a lower surface of the light leakage preventing member and a lower surface of the light guide plate. ### Claim 7 (depends on 1) The side-incidence backlight module according to claim 1, further comprising three reflective films, wherein one reflective film is attached to an upper surface of the light leakage preventing member and part of an upper surface of the light guide plate at the light leakage preventing member side, one reflective film is attached to a lower surface of the light leakage preventing member, and the other reflective film is attached to a lower surface of the light guide plate. ### Claim 8 (depends on 7) The side-incidence backlight module according to claim 7, wherein at one side of the light strip, sides of the two reflective films are flush with a side of the light leakage preventing member. ### Claim 9 (depends on 1) The side-incidence backlight module according to claim 1, wherein a material of the light leakage preventing member is the same as that of the light guide plate. ### Claim 10 (depends on 1) The side-incidence backlight module according to claim 1, wherein the light incident surface of the light guide plate is an oblique surface, and distance between the light incident surface and the light leakage preventing member gradually increases in a direction from an upper surface of the light guide plate to a bottom surface of the light guide plate. ### Claim 11 (depends on 1) The side-incidence backlight module according to claim 1, wherein an inner surface of the groove is a smooth curved surface. ### Claim 12 (depends on 11) The side-incidence backlight module according to claim 11, wherein the curved surface is part of a circumferential surface or part of an elliptical surface. ### Claim 13 (depends on 1) The side-incidence backlight module according to claim 1, wherein the side-incidence backlight module further comprises a back plate, and the light guide plate and the light leakage preventing member are disposed on the back plate. ### Claim 14 (depends on 1) The side-incidence backlight module according to claim 1, wherein the light strip further comprises a printed circuit board, and the at least one light emitting element is disposed on the printed circuit board. ### Claim 15 (depends on 1) The side-incidence backlight module according to claim 1, wherein a gap exists between the light leakage preventing member and the light incident surface of the light guide plate. ### Claim 16 (depends on 1) A display device comprising the side-incidence backlight module according to claim 1. ### Claim 17 (depends on 2) The side-incidence backlight module according to claim 2, wherein a gap exists between the light leakage preventing member and the light incident surface of the light guide plate. ### Claim 18 (depends on 3) The side-incidence backlight module according to claim 3, wherein a gap exists between the light leakage preventing member and the light incident surface of the light guide plate. ### Claim 19 (depends on 2) A display device comprising the side-incidence backlight module according to claim 2. ### Claim 20 (depends on 3) A display device comprising the side-incidence backlight module according to claim 3.