# US 2025/0093572 A1 · 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 2025/0093572 A1 - Document ID: US20250093572A1 - Status: Published application - Kind: A1 - Application number: 18/727,584 - Filed: 2022-09-23 - Published: 2025-03-20 - Earliest claimed: 2022-09-23 - Assignees: Fuzhou Boe Optoelectronics Technology Co., Ltd.; Boe Technology Group Co., Ltd. - Applicants: Fuzhou Boe Optoelectronics Technology Co., Ltd.; Boe Technology Group Co., Ltd. - Inventors: Zhijie Guo; Geng Chen; Kai Diao; Long Hu; Han Zhang; Ming Chen; Yuhang Lin; Liangliang Ren; Zhiying Chen - Web page: https://patentgrep.com/patent/US20250093572A1 ## CPC - G02B 6/0051: {Diffusing sheet or layer} - G02B 6/0068: {Arrangements of plural sources, e.g. multi-colour light sources} - G02B 6/00: Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings - G02B 6/005: {provided by one optical element, or plurality thereof, placed on the light output side of the light guide} - G02B 6/0076: {Stacked arrangements of multiple light guides of the same or different cross-sectional area} - G02B 6/0088: {of the light guide or other optical sheets in the package} - G02F 1/1336: {Illuminating devices} - 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 includes first and second light guide plates, an anti-peeping film, and first and second light sources. The anti-peeping film is located on a first light exit surface of the first light guide plates. The second light guide plate is located on a side of the anti-peeping film away from the first light guide plate. The first light source is opposite a first light incident surface of the first light guide plate. The second light source includes a first portion extending along the direction perpendicular to the reference plane and opposite a second light incident surface of the second light guide plate. A side of the first light source proximate to the fist light guide plate is staggered from a side of the second light source proximate to the second light guide plate, and closer to center of the first light guide plate than the second light source. ## Claims ### Claim 1 A backlight module, comprising: a first light guide plate having a first light exit surface and a first light incident surface intersecting the first light exit surface; an anti-peeping film located on a side of the first light exit surface of the first light guide plate; a second light guide plate located on a side of the anti-peeping film away from the first light guide plate, the second light guide plate having a second light exit surface away from the anti-peeping film and a second light incident surface intersecting the second light exit surface, wherein the second light incident surface and the first light incident surface are located at a same side of the first light guide plate; and a first light source and a second light source that are arranged along a direction perpendicular to a reference plane, the first light source being opposite the first light incident surface; wherein the second light source includes a first portion, the first portion extending along the direction perpendicular to the reference plane and being opposite the second light incident surface; a side of the first light source proximate to the first light guide plate is staggered from a side of the second light source proximate to the second light guide plate, and the side of the first light source proximate to the first light guide plate is closer to a center of the first light guide plate than the second light source; and the reference plane is a plane where the first light exit surface is located. ### Claim 2 (depends on 1) The backlight module according to claim 1, wherein the second light source further includes a second portion connected to the first portion, the second portion of the second light source being opposite the first light incident surface; and the first light source is located between the first light incident surface and the second portion of the second light source. ### Claim 3 (depends on 1) The backlight module according to claim 1, further comprising a light-shielding component, wherein in the direction perpendicular to the reference plane, the light-shielding component is located between the first light source and the second light guide plate; and an orthographic projection of the light-shielding component on the reference plane covers an orthographic projection of at least a portion of the first light source on the reference plane. ### Claim 4 (depends on 3) The backlight module according to claim 3, wherein in a direction parallel to the reference plane, the light-shielding component extends to a space between the first light guide plate and the second light guide plate; and the second light incident surface extends beyond the first light incident surface; and/or a partial boundary, away from second light source, of a boundary of the orthographic projection of the light-shielding component on the reference plane, and a partial boundary, away from the second light source, of a boundary of an orthographic projection of the first light source on the reference plane a distance therebetween, and the distance is greater than or equal to 3.5 mm. ### Claim 5 (canceled) ### Claim 6 (depends on 3) The backlight module according to claim 3, further comprising: a light adjustment layer located between the anti-peeping film and the first light guide plate, the light adjustment layer including a third portion extending to a top of the first light source; and a first light-shielding layer located on a surface, facing the first light guide plate, of the third portion of the light adjustment layer, wherein the first light-shielding layer and the third portion of the light adjustment layer form the light-shielding component. ### Claim 7 (depends on 6) The backlight module according to claim 6, wherein the light adjustment layer includes: a diffusion sheet located between the anti-peeping film and the first light guide plate; and a prism layer located between the anti-peeping film and the diffusion sheet; wherein a portion of the diffusion sheet extending to the top of the first light source forms the third portion, and the first light-shielding layer is located on a side of the diffusion sheet proximate to the first light guide plate; and/or the third portion of the light adjustment layer and the second portion of the second light source have a gap therebetween. ### Claim 8 (canceled) ### Claim 9 (depends on 6) The backlight module according to claim 6, wherein the first light source includes: a first light-emitting device and a first substrate arranged sequentially along a direction away from the first light incident surface, an extension direction of the first substrate being substantially perpendicular to the reference plane; and the orthographic projection of the light-shielding component on the reference plane covers an orthographic projection of the first light-emitting device on the reference plane, and an orthographic projection of a portion of the first substrate on the reference plane. ### Claim 10 (canceled) ### Claim 11 (depends on 4) The backlight module according to claim 4, wherein the second light guide plate further has a second non-light incident surface intersecting the second light exit surface, and the second non-light incident surface and the second light incident surface surround the second light exit surface; and the backlight module further comprises: a light adjustment layer located between the anti-peeping film and the first light guide plate; a back plate having an installation depression, wherein the first light guide plate, the anti-peeping film, the light adjustment layer, the second light guide plate, the first light source, and the second light source are located within the installation depression; and a plastic frame fastened to the back plate and including a first bending edge, wherein the first bending edge is located at a top of the back plate; wherein an orthographic projection of the first bending edge on the reference plane, covers an orthographic projection of an edge portion, corresponding to the second non-light incident surface, of the second light guide plate, an orthographic projection of an edge portion, corresponding to the second non-light incident surface, of the anti-peeping film, and an orthographic projection of an edge portion, corresponding to the second non-light incident surface, of the light adjustment layer. ### Claim 12 (depends on 3) The backlight module according to claim 3, further comprising a fixing component connected to the light-shielding component, wherein the fixing component is located between the first light source and the second portion of the second light source. ### Claim 13 (depends on 12) The backlight module according to claim 12, wherein the orthographic projection of the light-shielding component on the reference plane covers an orthographic projection of the first light source on the reference plane; and the fixing component is connected to a side surface of the light-shielding component proximate to the second light source to form a Structure, and along a direction perpendicular to an extension direction of the structure, a cross-section pattern of the structure of the light-shielding component and the fixing component is L-shaped. ### Claim 14 (depends on 12) The backlight module according to claim 12, wherein the second light guide plate further has a second non-light incident surface and a bottom surface, the bottom surface facing away from the second light exit surface; wherein the second non-light incident surface intersects and is perpendicular to the second light exit surface; and the backlight module further comprises: a second light-shielding layer covering the second non-light incident surface, and a third light-shielding layer covering a portion of the bottom surface proximate to the second non-light incident surface, the third light-shielding layer being connected to the second light-shielding layer: or the second non-light incident surface intersects the bottom surface, and the second non-light incident surface and the bottom surface have an included angle being an obtuse angle; and the backlight module further comprises a fourth light-shielding layer covering the second non-light incident surface. ### Claim 15 (canceled) ### Claim 16 (depends on 3) The backlight module according to claim 3, further comprising a mid-frame, the mid-frame including a bottom frame, wherein the bottom frame is located between the anti-peeping film and the second light guide plate, and is configured to carry the second light guide plate; and the bottom frame includes a first bottom plate at a same side as the first light source, wherein the first bottom plate extends to a top of the first light source; and an orthographic projection of the first bottom plate on the reference plane covers the orthographic projection of the at least a portion of the first light source on the reference plane, and the first bottom plate forms the light-shielding component. ### Claim at position 17 17-21. (canceled) ### Claim 22 (depends on 1) The backlight module according to claim 1, wherein the second light guide plate further has a second non-light incident surface intersecting the second light exit surface, the second non-light incident surface and the second light incident surface surrounding the second light exit surface; the backlight module further comprises: a back plate having an installation depression, the first light guide plate, the anti-peeping film, the first light source, and the second light source being located within the installation depression; and a plastic frame fastened to the back plate, the plastic frame including a first bending edge and a second bending edge; wherein the first bending edge is located at a top of the back plate; an orthographic projection of the first bending edge on the reference plane covers an orthographic projection of a portion, proximate to the second non-light incident surface, of the second light guide plate on the reference plane; and a width of the first bending edge is W1, 3 mm≤W1≤8 mm; and the second bending edge is located at the top of the back plate; an orthographic projection of the second bending edge on the reference plane covers an orthographic projection of a portion, proximate to the second light incident surface, of the second light guide plate on the reference plane; and a width of the second bending edge is W2, 10 mm≤W2≤17 mm. ### Claim 23 (depends on 1) The backlight module according to claim 1, wherein the anti-peeping film includes: a first protective layer, a connection layer and a second protective layer that are sequentially stacked along the direction perpendicular to the reference plane; a plurality of first light-shielding strips, located between the first protective layer and the connection layer and extending along a first direction; and a plurality of second light-shielding strips, located between the connection layer and the second protective layer and extending along a second direction; wherein the first direction and the second direction are both parallel to the reference plane; and the first direction is same as the second direction, or the first direction intersects the second direction. ### Claim 24 (canceled) ### Claim 25 (depends on 23) The backlight module according to claim 23, wherein the first light-shielding strips each have a cross-section along a direction perpendicular to the first direction, and the cross-section is in shape of a trapezoid; and the second light-shielding strips each have a cross-section along a direction perpendicular to the second direction, and the cross-section is in a shape of a trapezoid; and the first direction intersects the second direction; the anti-peeping film has anti-peeping directions being a third direction and a fourth direction, the third direction being opposite the fourth direction; and the first direction and the second direction both intersect the third direction; the connection layer includes: a third protective layer, a second adhesive layer and a fourth protective layer that are sequentially stacked along the direction perpendicular to the reference plane; an anti-peeping viewing angle of the anti-peeping film in the fourth direction satisfies a formula: γ 1 = 90 ⁢ ° - tan - 1 ⁢ 2 * cos ⁢ α * ( 2 ⁢ H + 2 ⁢ h + h 1 ) 2 ⁢ P + 2 ⁢ P 1 * cos ⁢ α - W - w , and an anti-peeping viewing angle of the anti-peeping film in the third direction satisfies a formula: δ 1 = 90 ⁢ ° - tan - 1 ⁢ 2 * cos ⁢ α * ( 2 ⁢ H + 2 ⁢ h + h 1 ) 2 ⁢ P + 2 ⁢ P 2 * cos ⁢ α - W - w , wherein γ1 is the anti-peeping viewing angle of the anti-peeping film in the fourth direction; δ1 is the anti-peeping viewing angle of the anti-peeping film in the third direction; H is a height of the first light-shielding strip or of the second light-shielding strip; h is a thickness of the third protective layer or of the fourth protective layer; h1 is a thickness of the second adhesive layer; a is a complementary angle of an included angle between the first direction and the third direction, and is a complementary angle of an included angle between the second direction and the fourth direction; P is a minimum distance between centers of cross-sections of two adjacent first light-shielding strips, and is a minimum distance between centers of cross-sections of two adjacent second light-shielding strips; W is a width of a lower base of the cross-section of the first light-shielding strip or of the cross-section of the second light-shielding strip; and w is a width of an upper base of the cross-section of the first light-shielding strip or of the cross-section of the second light-shielding strip; and P1 is a distance between a center of a cross-section of a second light-shielding strip and a center of a cross-section of a first light-shielding strip adjacent thereto along the third direction; P2 is a distance between the center of the cross-section of the second light-shielding strip and a center of a cross-section of another first light-shielding strip adjacent thereto along the fourth direction; and a sum of P1 and P2 is a distance, in the third direction, between the centers of the cross-sections of the two adjacent first light-shielding strips, and is a distance, in the fourth direction, between the centers of the cross-sections of the two adjacent second light-shielding strips. ### Claim 26 (depends on 25) The backlight module according to claim 25, wherein an included angle between the first direction and the second direction is greater than or equal to 15°. ### Claim 27 (depends on 25) The backlight module according to claim 25, wherein the first light-shielding strips each have a cross-section along a direction perpendicular to the first direction, and the cross-section is in a shape of a trapezoid; and the second light-shielding strips each have a cross-section along a direction perpendicular to the second direction, and the cross-section is in a shape of a trapezoid; and the first direction is same as the second direction; and orthographic projections of the first light-shielding strips on the reference plane overlaps orthographic projections of the second light-shielding strips on the reference plane; the connection layer includes: a third protective layer, a second adhesive layer and a fourth protective layer that are sequentially stacked along the direction perpendicular to the reference plane; an anti-peeping viewing angle of the anti-peeping film satisfies a formula: θ = 2 * ( 90 ⁢ ° - tan - 1 ⁢ 4 ⁢ H + 4 ⁢ h + 2 ⁢ h 1 2 ⁢ P - W - w ) , wherein θ is the anti-peeping viewing angle; H is a height of the first light-shielding strip or of the second light-shielding strip; h is a thickness of the third protective layer or of the fourth protective layer; h1 is a thickness of the second adhesive layer; P is a distance between centers of cross-sections of two adjacent first light-shielding strips, and is a distance between centers of cross-sections of two adjacent second light-shielding strips; W is a width of a lower base of the cross-section of the first light-shielding strip or of the cross-section of the second light-shielding strip; and w is a width of an upper base of the cross-section of the first light-shielding strip or of the cross-section of the second light-shielding strip. ### Claim 28 (depends on 25) The backlight module according to claim 25, wherein 7 μm≤w≤12 μm; and/or 13 μm≤W≤19 μm; and/or 60 μm≤P≤70 μm; and/or 135 μm≤H≤155 μm; and/or 170 μm≤h≤190 μm. ### Claim 29 (canceled) ### Claim 30 (canceled) ### Claim 31 (depends on 1) The backlight module according to claim 1, wherein a thickness of the first light guide plate is h2, a thickness of the second light guide plate is h3, and h2 and h3 satisfy: 0.5 < h 3 h 2 < 1. ### Claim 32 (canceled) ### Claim 33 (depends on 1) A display device, comprising: the backlight module according to claim 1; and a display panel located on a side, away from the first light guide, of the second light guide in the backlight module.