Backlight module and display device

Abstract

The embodiment of the present disclosure discloses a backlight module and a display device, and relates to but is not limited to the technical field of display. The backlight module comprises a back plate, a light guide plate and an optical film. The back plate comprises a bottom plate and a first retaining wall arranged on the side of the bottom plate facing the display panel. The first retaining wall is located on the non-bonding side. The light guide plate is arranged on the side of the bottom plate facing the display panel. The optical film is arranged on the side of the light guide plate away from the bottom plate, and the plane on the side of the optical film facing the bottom plate is attached or spaced apart from the surface on the side of the first retaining wall away from the bottom plate along the direction perpendicular to the bottom plate. In this way, the side of the optical film facing the non-bonding side is not blocked by the back plate, the size of the frame of the display device on the non-bonding side can be reduced, the frame size can be reduced to 1.4 mm or less, and the expansion space of the optical film can be increased to avoid wrinkles of the optical film.

Description

Technical Field

[0001] This disclosure relates to, but is not limited to, the field of display technology, and more specifically, to a backlight module and a display device. Background Technology

[0002] Organic light-emitting diodes (OLEDs) are active-matrix display devices with advantages such as self-illumination, wide viewing angle, high contrast, low power consumption, extremely fast response speed, thinness, flexibility, and low cost. With the continuous development of display technology, notebook computer (NB) displays using OLEDs as the light-emitting device and thin-film transistors (TFTs) for signal control have become the mainstream products in the notebook computer industry.

[0003] As the proportion of OLED in notebook displays increases year by year, the concept of full-screen notebook displays is receiving more and more attention, especially the requirements for the product bezel specifications of notebook displays are becoming more and more stringent. Utility Model Content

[0004] This disclosure provides a backlight module configured to provide a light source for a display panel, wherein the display panel includes a non-bonded side, and the backlight module includes:

[0005] The back plate includes a base plate and a first barrier wall disposed on the side of the base plate facing the display panel, wherein the first barrier wall is located on the non-bonding side;

[0006] A light guide plate is disposed on the side of the base plate facing the display panel; and

[0007] An optical film is disposed on the side of the light guide plate away from the base plate. The plane of the optical film facing the base plate is attached to or spaced apart from the surface of the first retaining wall on the side away from the base plate in a direction perpendicular to the base plate.

[0008] In some embodiments of the backlight module, the side of the light guide plate facing the non-bonding side of its orthogonal projection on the base plate is located within the range of the orthogonal projection of the optical film on the base plate, and the minimum distance from the side of the light guide plate facing the non-bonding side of its orthogonal projection on the base plate to the edge of the orthogonal projection of the optical film on the base plate is 0 mm to 1 mm.

[0009] This disclosure also provides a display device, including:

[0010] Display panel;

[0011] The backlight module as described above; and

[0012] A fixing tape, at least partially located on the non-bonding side, is bonded between the display panel and the optical film and is also bonded to the back plate.

[0013] In some embodiments of the backlight module, the non-bonding side is not provided with a frame.

[0014] In some embodiments of the backlight module, the orthographic projection of the display panel along a direction perpendicular to the backlight module covers the backlight module, and the minimum distance from the edge of the orthographic projection of the display panel along a direction parallel to the backlight module to the backlight module is 0.05mm to 0.15mm.

[0015] In some embodiments of the backlight module, the fixing tape includes a transparent adhesive layer, which includes a first adhesive portion, a second adhesive portion, and a third adhesive portion;

[0016] The first adhesive portion is bonded between the display panel and the optical film;

[0017] The second adhesive portion is bonded to the side of the base plate opposite to the display panel;

[0018] The third adhesive portion is connected between the first adhesive portion and the second adhesive portion and is bonded to the first retaining wall.

[0019] In some embodiments of the backlight module, the orthographic projections of the display panel, the first adhesive portion, and the optical film on the substrate overlap, and the minimum dimension of the overlapping position along the direction parallel to the substrate is greater than or equal to 0.5 mm.

[0020] In some embodiments of the backlight module, the minimum dimension of the orthographic projection of the second adhesive portion onto the base plate along a direction parallel to the base plate is greater than or equal to 0.5 mm.

[0021] In some embodiments of the backlight module, the fixing tape further includes a light-shielding layer, which is bonded to the side of the second bonding portion away from the base plate and the side of the third bonding portion away from the first retaining wall.

[0022] In some embodiments of the backlight module, the display device further includes a light-shielding connection layer;

[0023] The light-shielding bonding layer is connected to the side of the display panel facing the non-bonded side and the side of the light-shielding layer facing away from the transparent adhesive layer.

[0024] In some embodiments of the backlight module, the light-shielding layer covers the side of the third adhesive portion facing the light-shielding connecting layer; or

[0025] The third adhesive portion includes a first portion disposed opposite to the light-shielding layer and a second portion disposed opposite to the light-shielding connecting layer, wherein the second portion is connected between the first adhesive portion and the first portion.

[0026] In some embodiments of the backlight module, the light-shielding bonding layer is configured to be formed by curing a first colloid;

[0027] The first colloid is a hot melt adhesive or a curing adhesive; and / or

[0028] The aspect ratio of the light-shielding connecting layer is greater than or equal to 7.

[0029] In some embodiments of the backlight module, there is a gap between the display panel and the light-shielding connecting layer, the gap being filled with a first connecting portion, the first connecting portion being configured to be formed by curing a second colloid.

[0030] In some embodiments of the backlight module, the display panel includes an array substrate, an opposing substrate, an upper polarizer, and a lower polarizer;

[0031] The opposing substrate is disposed on the side of the array substrate away from the backlight module, the upper polarizer is disposed on the side of the opposing substrate away from the backlight module, and the lower polarizer is disposed on the side of the array substrate facing the back plate.

[0032] The side of the opposing substrate facing the unbonded side and the side of the upper polarizer facing the unbonded side are projected onto the backlight module.

[0033] In some embodiments of the backlight module, the side of the array substrate facing the unbonded side and the side of the lower polarizer facing the unbonded side are projected onto the backlight module in orthographic projection.

[0034] The side of the array substrate facing the non-bonding side and the side of the opposing substrate facing the non-bonding side coincide on the orthographic projection of the array substrate onto the backlight module; or

[0035] The orthographic projection of the side of the array substrate facing the non-bonding side onto the backlight module is located on the side of the orthographic projection of the side of the opposing substrate facing the non-bonding side onto the backlight module that is farther away from the non-bonding side. The minimum distance between the orthographic projection of the side of the array substrate facing the non-bonding side onto the backlight module and the orthographic projection of the side of the opposing substrate facing the non-bonding side onto the backlight module is greater than or equal to 0.05 mm. A second connection portion is filled between the array substrate, the lower polarizer, and the light-shielding connection layer. The second connection portion is configured to be formed by curing a third colloid.

[0036] In some embodiments of the backlight module, the light-shielding connecting layer is edge-sealing shielding tape.

[0037] In some embodiments of the backlight module, the display device further includes a cover plate disposed on the side of the display panel opposite to the backlight module;

[0038] The cover plate covers the display panel, and the minimum distance from the edge of the cover plate to the edge of the display panel along the direction parallel to the backlight module is greater than or equal to 0.5 mm;

[0039] The light-shielding connecting layer is connected to the side of the cover plate facing the backlight module.

[0040] In some embodiments of the backlight module, the display panel further includes a bonding side, and the back plate further includes a second barrier wall, the second barrier wall being U-shaped with a folded edge, the second barrier wall being disposed on the side of the base plate facing the display panel and located on the bonding side;

[0041] The optical film has a lug located on the bonding side, and the lug is disposed on the second retaining wall.

[0042] Implementing the embodiments disclosed herein will have the following beneficial effects:

[0043] The backlight module and display device provided in this disclosure have, on the non-bonding side, the plane of the optical film facing the base plate and the surface of the first retaining wall away from the base plate are attached or spaced apart in a direction perpendicular to the base plate. This ensures that the side of the optical film facing the non-bonding side is not obstructed by the back plate, which can reduce the size of the display device's bezel on the non-bonding side, reducing the bezel size to 1.4mm or less, and can increase the expansion space of the optical film, avoiding wrinkles in the optical film.

[0044] Other features and advantages of this disclosure will be set forth in the following description and will be apparent in part from the description or may be learned by practicing the disclosure. The objects and other advantages of this disclosure may be realized and obtained by means of the structures particularly pointed out in the description and the drawings. Attached Figure Description

[0045] The accompanying drawings are provided to further understand the technical solutions of this disclosure and constitute a part of the specification. They are used together with the embodiments of this disclosure to explain the technical solutions of this disclosure and do not constitute a limitation on the technical solutions of this disclosure.

[0046] Figure 1 This is a partial cross-sectional view of a display device on the non-bonded side in related technologies;

[0047] Figure 2This is a partial cross-sectional view of the display device on the non-binding side in an embodiment of this disclosure;

[0048] Figure 3 A partial cross-sectional view of the display device on the non-bonded side after a light-shielding connection layer is provided in an embodiment of this disclosure;

[0049] Figure 4 This is a plan view of the display device after a light-shielding connection layer has been provided in an embodiment of this disclosure;

[0050] Figure 5 A partial cross-sectional view of the display device on the non-bonding side after the first connecting portion is provided in an embodiment of this disclosure;

[0051] Figure 6 A partial cross-sectional view on the non-bonded side of the display device after a light-shielding connection layer is provided in another embodiment of this disclosure;

[0052] Figure 7 This is a partial cross-sectional view on the non-bonded side of the display device after a light-shielding connection layer is provided in another embodiment of this disclosure;

[0053] Figure 8 A partial cross-sectional view of the display device on the non-bonding side after the second connecting portion is provided in an embodiment of this disclosure;

[0054] Figure 9 A partial cross-sectional view of the display device on the non-bonding side after the cover plate is provided in an embodiment of this disclosure;

[0055] Figure 10 A partial cross-sectional view of the display device on the non-bonding side after a cover plate is provided in another embodiment of this disclosure;

[0056] Figure 11 This is a partial cross-sectional view of the display device on the bonding side in an embodiment of this disclosure, wherein the cross-sectional position corresponds to... Figure 13 BB section in the middle;

[0057] Figure 12 This is a partial cross-sectional view of the display device on the bonding side after the cover plate is installed in an embodiment of this disclosure, wherein the cross-sectional position corresponds to... Figure 13 BB section in the middle;

[0058] Figure 13 This is a schematic diagram showing the connection relationship between the lug and the U-shaped fold in the display device in an embodiment of this disclosure.

[0059] Explanation of icon numbers:

[0060] 10' Backplate; 11' Barrier; 20' Display panel; 30' Edge-sealing shielding tape; 40' Frame; 50' Fixing tape; 10 Display panel; 11 Array substrate; 12 Opposing substrate; 13 Upper polarizer; 14 Lower polarizer; 20 Backlight module; 21 Backplate; 211 Base plate; 212 First barrier; 213 Second barrier; 2131 First barrier section; 2132 Second barrier section; 2133 Third barrier section; 214 Edge-sealing shielding tape layer; 215 Printed circuit board; 21 6. Components; 22. Light guide plate; 221. Light-incident side; 222. Light-emitting surface; 23. Optical film; 231. Lug; 24. Reflector; 25. LED strip; 251. LED strip circuit board; 252. Point light source; 30. Fixing tape; 31. Transparent adhesive layer; 311. First adhesive part; 312. Second adhesive part; 313. Third adhesive part; 32. Light-shielding layer; 40. Light-shielding connecting layer; 50. First connecting part; 60. Second connecting part; 70. Cover plate; 71. Optical adhesive; 80. LED strip light-shielding tape; 90. Buffer tape. Detailed Implementation

[0061] To make the objectives, technical solutions, and advantages of this disclosure clearer, the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described in this disclosure can be arbitrarily combined with each other.

[0062] The inventors of this disclosure have discovered that, on the non-binding side of a display device in the related technology (such as...) Figure 1 As shown, the retaining wall 11' of the back plate 10' extends to the plane where the display panel 20' is located, making the retaining wall 11' relatively thick. A cell tape 30' is attached to the side of the back plate 10' facing away from the display panel 20', and the cell tape 30' is attached to the retaining wall 11' and connected to the display panel 20'. A frame 40' is provided on the non-bonding side, located on the side of the back plate 10' facing the display panel 20', and the frame 40' is bonded to the display panel 20' and to the retaining wall 11' using fixing tape 50'. This results in a larger bezel size on the non-bonding side of the display device (i.e., the area from the display area AA to the outer edge of the display device), which cannot meet the requirement of a bezel size of 1.4mm or less.

[0063] Please combine them together Figure 2 , Figure 3 , Figures 5 to 12The display device provided in the embodiments of this disclosure will now be described. The display device includes a display panel 10 and a backlight module 20. The backlight module 20 is configured to provide a light source for the display panel 10. The display panel 10 includes a display area AA, a bonding side (DP side), and a non-bonding side. The bonding side can be an area of ​​the display panel 10 provided for bonding with a peripheral circuit board. For example, the bonding side can be bonded to the peripheral circuit board by bonding a flexible circuit board. The non-bonding side can be an area of ​​the display panel 10 that is not provided for bonding with a peripheral circuit board. The bonding side and the non-bonding side are arranged circumferentially outside the display area AA. The display area AA has four sides (L / R / U / D), at least one of the four sides is provided with a bonding side, and the remaining four sides are provided with non-bonding sides. Figure 4 As shown in this embodiment, the upper (U), left (L), and right (R) sides of the display area AA are all provided with unbound sides. The lower (D) side of the display area AA is provided with a bound side.

[0064] The backlight module 20 includes a backplate 21, a light guide plate 22, and an optical film 23. The backplate 21 includes a base plate 211 and a first barrier 212 disposed on the side of the base plate 211 facing the display panel 10. The first barrier 212 is located on the non-bonding side. The light guide plate 22 is disposed on the side of the base plate 211 facing the display panel 10. The optical film 23 is disposed on the side of the light guide plate 22 facing away from the base plate 211. The plane of the optical film 23 facing the base plate 211 and the surface of the first barrier 212 facing away from the base plate 211 are either bonded together or spaced apart along a direction perpendicular to the base plate 211. In this embodiment, the distance between the plane of the optical film 23 facing the base plate 211 and the surface of the first barrier 212 facing away from the base plate 211 along a direction perpendicular to the base plate 211 can be approximately 0 mm to 0.5 mm. For example, the distance between the plane of the optical film 23 facing the base plate 211 and the side of the first retaining wall 212 away from the base plate 211 along a direction perpendicular to the base plate 211 can be about 0.3 mm.

[0065] The backlight module 20 and display device provided in this embodiment have, on the non-bonding side, the plane of the optical film 23 facing the base plate 211 and the surface of the first barrier wall 212 away from the base plate 211 are attached or spaced apart in a direction perpendicular to the base plate 211. This makes the side of the optical film 23 facing the non-bonding side unobstructed by the back plate 21, which can reduce the size of the bezel of the display device on the non-bonding side, reducing the bezel size to 1.4mm or less, and can increase the expansion space of the optical film 23, avoiding wrinkles in the optical film 23.

[0066] In the exemplary embodiments, please refer to Figure 2 , Figure 3 , Figures 5 to 10 The side of the light guide plate 22 projected onto the base plate 211 facing the non-bonding side is located within the range of the optical film 23 projected onto the base plate 211, and the minimum distance from the side of the light guide plate 22 projected onto the base plate 211 facing the non-bonding side to the edge of the optical film 23 projected onto the base plate 211 can be approximately 0 mm to 1 mm. For example, the minimum distance from the side of the light guide plate 22 projected onto the base plate 211 facing the non-bonding side to the edge of the optical film 23 projected onto the base plate 211 can be approximately 0.5 mm. This design allows the edge of the optical film 23 on the non-bonding side to extend beyond the edge of the light guide plate 22 on the non-bonding side, enabling the optical film 23 to block local light concentration at the edge of the light guide plate 22, thus diffusing light more evenly and improving the brightness uniformity of the backlight module 20. Furthermore, the optical film 23 can also compensate for alignment errors during the assembly of the optical film 23 and the light guide plate 22, preventing light leakage or uneven brightness caused by the optical film 23 not covering the light guide plate 22. In addition, the optical film 23 and the light guide plate 22 are made of different materials, which may result in different rates of volume change when they expand due to heat. The edge of the optical film 23 on the non-bonding side extends beyond the edge of the light guide plate 22 on the non-bonding side, preventing warping or stretching deformation of the edge of the optical film 23 due to differences in thermal expansion, and preventing defects such as wrinkles.

[0067] In the exemplary embodiments, please continue to refer to Figure 2 , Figure 3 , Figures 5 to 10 The backlight module 20 also includes a reflective sheet 24. The reflective sheet 24 is disposed between the light guide plate 22 and the base plate 211. The side of the reflective sheet 24 facing the non-bonding side of its orthogonal projection on the base plate 211 coincides with the side of the light guide plate 22 facing the non-bonding side of its orthogonal projection on the base plate 211.

[0068] In the exemplary embodiments, please refer to Figure 11 and Figure 12 The backlight module 20 also includes a light strip 25. The light guide plate 22 includes a light-incident side 221 located on the bonding side and a light-emitting surface 222 disposed opposite to the display panel 10. An optical film 23 is disposed on the light-emitting surface 222. The light strip 25 is disposed on the light-incident side 221, and includes a light strip circuit board 251 and a plurality of point light sources 252 disposed on the light strip circuit board 251. The light strip circuit board 251 is disposed on the same layer as the reflector 24, and at least a portion of the light strip circuit board 251 is disposed between the light-emitting surface 222 and the base plate 211. The point light sources 252 are disposed on the side of the light strip circuit board 251 facing away from the base plate 211 and located on the light-incident side 221. The light strip circuit board 251 can be bonded and fixed to the light-emitting surface 222 and the base plate 211 respectively, thereby ensuring a stable gap between the point light sources 252 and the light-incident side 221, avoiding light decay defects, and achieving a high-brightness backlight module 20.

[0069] The optical film material 23 can be a composite film material. The composite film material may include a POP layer and a lower diffusion layer. The POP layer is a double prism layer. Alternatively, the composite film material may include a DPP layer and a lower diffusion layer. The DPP layer includes a double prism layer and a diffuser layer. The composite film material can also be, but is not limited to, a photonic patterned diffuser (PPD) or a dual polarized photonic dielectric (DPPD). The composite film material avoids wrinkling defects caused by residual adhesion (RA), and compared to multi-film stacking, it also prevents the risk of displacement as the backlight module 20 moves.

[0070] In the exemplary embodiments, please refer to Figure 2 , Figure 3 , Figures 5 to 10 The display device also includes a fixing tape 30, which is at least partially located on the non-bonding side. The fixing tape 30 is bonded between the display panel 10 and the optical film 23 and to the back plate 21. In this way, the fixing tape 30 can ensure the stability of the relative position and optical performance of the display panel 10 and the backlight module 20.

[0071] In the exemplary embodiments, please refer to Figures 1 to 3 , Figures 5 to 10 The non-bonding side does not have a frame 40'. Since the display panel 10 can be bonded to the optical film 23 via the fixing tape 30, the backlight module 20 can still provide stable support for the display panel 10 even without the frame 40'. Figure 1 As shown, in display devices of the related art, the frame 40' is generally disposed between the optical film 23 and the barrier 11'. In this embodiment of the present disclosure, the frame 40' is not disposed on the non-bonding side, which can reduce the distance between the optical film 23 and the first barrier 212 in the direction parallel to the base plate 211, thereby further reducing the size of the frame of the display device on the non-bonding side.

[0072] In the exemplary embodiments, please continue to refer to Figure 2 , Figure 3 , Figures 5 to 10The orthographic projection of the display panel 10 along a direction perpendicular to the backlight module 20 covers the backlight module 20, making the size of the display panel 10 larger than the size of the backlight module 20. The minimum distance from the edge of the orthographic projection of the display panel 10 along a direction parallel to the backlight module 20 to the backlight module 20 can be approximately 0.05mm to 0.15mm. For example, the minimum distance from the edge of the orthographic projection of the display panel 10 along a direction perpendicular to the backlight module 20 to the backlight module 20 can be approximately 0.1mm. This ensures the cutting accuracy of the display panel 10, facilitates the assembly of the backlight module 20, and improves the assembly accuracy of the display panel 10 and the backlight module 20.

[0073] In the exemplary embodiments, please continue to refer to Figure 2 , Figure 3 , Figures 5 to 10 The fixing tape 30 includes a transparent adhesive layer 31. The transparent adhesive layer 31 includes a first adhesive portion 311, a second adhesive portion 312, and a third adhesive portion 313. The first adhesive portion 311 is bonded between the display panel 10 and the optical film 23. The second adhesive portion 312 is bonded to the side of the base plate 211 facing away from the display panel 10. The third adhesive portion 313 connects the first adhesive portion 311 and the second adhesive portion 312 and is bonded to the first barrier 212. This makes the transparent adhesive layer 31 U-shaped, ensuring the connection area between the fixing tape 30 and the display panel 10 and the backlight module 20, improving bonding stability, and thus ensuring the connection stability between the display panel 10 and the backlight module 20. The first adhesive portion 311 is positioned close to the display area AA. When the side of the first adhesive portion 311 closest to the display area AA is too close to the display area AA, the transparency of the first adhesive portion 311 can avoid defects such as black edges caused by first adhesive portions 311 made of other colors.

[0074] In the exemplary embodiments, please continue to refer to Figure 2 , Figure 3 , Figures 5 to 10 The orthographic projections of the display panel 10, the first adhesive portion 311, and the optical film 23 onto the base plate 211 overlap, and the minimum dimension of the overlapping position along the direction parallel to the base plate 211 can be greater than or equal to 0.5 mm. This results in a larger connection area between the display panel 10 and the optical film 23. The first adhesive portion 311 is bonded to the side of the optical film 23 facing away from the base plate 211, avoiding the risk of displacement of the optical film 23 when the backlight module 20 is moved.

[0075] In the exemplary embodiments, please continue to refer to Figure 2 , Figure 3 , Figures 5 to 10The minimum dimension of the orthographic projection of the second adhesive portion 312 onto the base plate 211 along the direction parallel to the base plate 211 is greater than or equal to 0.5 mm. This ensures a large connection area between the transparent adhesive layer 31 and the base plate 211, preventing the adhesive tape 30 from lifting due to its small adhesion width to the back plate 21.

[0076] In the exemplary embodiments, please continue to refer to Figure 2 , Figure 3 , Figures 5 to 10 The fixing tape 30 also includes a light-shielding layer 32, which is bonded to the side of the second bonding portion 312 opposite to the base plate 211 and the side of the third bonding portion 313 opposite to the first retaining wall 212. The light-shielding layer 32 can be aluminum foil or an opaque material layer.

[0077] In this embodiment, the edge of the light-shielding layer 32 near the display area AA and the edge of the second adhesive portion 312 near the display area AA are projected onto the base plate 211 in orthographic projection. The light-shielding layer 32 can be aluminum foil, which can take advantage of the excellent bending properties of aluminum foil to further avoid defects such as curling of the fixing tape 30.

[0078] In the exemplary embodiments, please refer to Figure 3 and Figures 5 to 10 The display device also includes a light-shielding connecting layer 40; the light-shielding connecting layer 40 is connected to the side of the display panel 10 facing the non-bonding side and the side of the light-shielding layer 32 facing away from the transparent adhesive layer 31. In addition to blocking stray light and preventing backlight leakage, the light-shielding connecting layer 40 further increases the connection area between the display panel 10 and the backlight module 20, improving connection stability. Furthermore, the light-shielding connecting layer 40 also serves to seal and connect to the mid-frame. The light-shielding layer 32 covers the side of the third adhesive portion 313 facing the light-shielding connecting layer 40, thus bringing the side of the light-shielding layer 32 away from the base plate 211 closer to the display panel 10, further enhancing the light-shielding effect.

[0079] Furthermore, in some embodiments, the third adhesive portion 313 includes a first portion disposed opposite to the light-shielding layer 32 and a second portion disposed opposite to the light-shielding connecting layer 40, with the second portion connected between the first adhesive portion 311 and the first portion. This allows the light-shielding connecting layer 40 to be directly connected to the second portion, i.e., the light-shielding connecting layer 40 can be directly connected to the transparent adhesive layer 31. Compared to aluminum foil, the surface of the transparent adhesive layer 31 is rougher, making the connection between the light-shielding connecting layer 40 and the transparent adhesive layer 31 more stable, thereby improving the connection stability between the display panel 10 and the backlight module 20. To improve the light-shielding effect, the second portion may be provided with other opaque material layers. These other opaque material layers are made of light-colored opaque materials, such as white opaque materials, to prevent shadows from forming.

[0080] In an exemplary embodiment, the light-shielding connecting layer 40 is formed by curing a first adhesive. Since the edge-sealing shielding tape is applied from the polarizer (POL) of the display panel 10 to the outer contour of the display device, the application width of the edge-sealing shielding tape cannot meet the application requirements due to the reduced bezel size in this embodiment. The light-shielding connecting layer 40 can be formed using different types of equipment, with the first adhesive applied to the side of the display panel 10 facing the non-bonding side and the side of the light-shielding layer 32 facing away from the transparent adhesive layer 31, thereby connecting and fixing the display panel 10 and the backlight module 20, and also providing light-shielding for the sides of the display device. Different types of equipment include, but are not limited to, five-axis dispensing equipment with solenoid valve nozzles or electrohydraulic inkjet printing equipment. The first adhesive requires a high optical density (OD) value to ensure the light-shielding effect. In this embodiment, when the thickness of the first adhesive is greater than or equal to 0.1 mm, the optical density value of the first adhesive is greater than or equal to 3. The first adhesive can be, but is not limited to, hot melt adhesive or curable adhesive. The aspect ratio of the light-shielding connecting layer 40 is greater than or equal to 7 to meet the ultra-thin requirement of the light-shielding connecting layer 40.

[0081] like Figure 9 As shown, the light-shielding connecting layer 40 can also be edge-sealing shielding tape.

[0082] In an exemplary embodiment, such as Figure 5 As shown, there is a gap between the display panel 10 and the light-shielding connecting layer 40, which is filled with a first connecting portion 50. The first connecting portion 50 is formed by curing a second adhesive. This first connecting portion 50 fills the gap between the display panel 10 and the light-shielding connecting layer 40, preventing light leakage defects caused by sagging or indentation of the light-shielding connecting layer 40 after prolonged storage of the display device, even with the gap present. It also avoids the need for prolonged pressure control to prevent rebound due to the long curing time of the first adhesive. The first connecting portion 50 uses electrohydraulic inkjet printing technology to initially fix the second adhesive between the display panel 10 and the backlight module 20, without requiring a high light density value.

[0083] In the exemplary embodiments, please refer to Figures 2 to 12 The display panel 10 includes an array substrate 11, a counter substrate 12, an upper polarizer 13, and a lower polarizer 14. The counter substrate 12 is disposed on the side of the array substrate 11 facing away from the backlight module 20. In this embodiment, the array substrate 11 can be a thin-film transistor array (TFT) substrate. The counter substrate 12 can be a color filter (CF) substrate. The upper polarizer 13 is disposed on the side of the counter substrate 12 facing away from the backlight module 20, and the lower polarizer 14 is disposed on the side of the array substrate 11 facing the backplate 21.

[0084] In product design, it is generally required that the black matrix (BM) between the array substrate 11 and the opposing substrate 12 be located at the edge of the display panel 10. Therefore, the light-shielding connection layer 40 needs to extend beyond the side of the array substrate 11 away from the backlight module 20 in order to avoid light leakage defects.

[0085] like Figure 6 As shown, the orthographic projections of the side of the opposing substrate 12 facing the non-bonding side and the side of the upper polarizer 13 facing the non-bonding side on the backlight module 20 coincide. This allows the side of the opposing substrate 12 facing the non-bonding side to be flush with the side of the upper polarizer 13 facing the non-bonding side, thus enabling the light-shielding connection layer 40 to move further upward to the upper polarizer 13 (generally the outermost part of the display device), which helps to further block the side of the array substrate 11 away from the backlight module 20 and prevent side light leakage of the display device.

[0086] In an exemplary embodiment, such as Figure 7 As shown, the orthographic projection of the side of the array substrate 11 facing the non-bonding side and the side of the lower polarizer 14 facing the non-bonding side on the backlight module 20 coincides. The orthographic projection of the side of the array substrate 11 facing the non-bonding side and the side of the opposing substrate 12 facing the non-bonding side on the backlight module 20 also coincides.

[0087] This allows the sides of the opposing substrate 12 facing the non-bonding side, the upper polarizer 13 facing the non-bonding side, the array substrate 11 facing the non-bonding side, and the lower polarizer 14 facing the non-bonding side to be aligned, thereby reducing the gap between the display panel 10 and the backlight module 20 and helping to avoid the risk of light leakage; in addition, it can increase the connection area between the display panel 10 and the backlight module 20, which helps to increase the strength of the display device.

[0088] In an exemplary embodiment, such as Figure 8 As shown, the orthographic projections of the side of the array substrate 11 facing the non-bonding side and the side of the lower polarizer 14 facing the non-bonding side on the backlight module 20 coincide. The orthographic projection of the side of the array substrate 11 facing the non-bonding side on the backlight module 20 is located on the side of the orthographic projection of the side of the opposing substrate 12 facing the non-bonding side on the backlight module 20 that is away from the non-bonding side. This allows the side of the array substrate 11 facing the non-bonding side and the side of the lower polarizer 14 facing the non-bonding side to be flush, and the array substrate 11 and the lower polarizer 14 are recessed relative to the light-shielding bonding layer 40, forming an inner groove.

[0089] The minimum distance between the orthographic projection of the side of the array substrate 11 facing the non-bonding side onto the backlight module 20 and the orthographic projection of the side of the opposing substrate 12 facing the non-bonding side onto the backlight module 20 is greater than or equal to 0.05 mm. A second connecting portion 60 is filled between the array substrate 11, the lower polarizer 14, and the light-shielding connection layer 40. The second connecting portion 60 is formed by curing a third colloid. The second connecting portion 60 can connect to the side of the opposing substrate 12 facing the backlight module 20, which helps to further shield the side of the array substrate 11 away from the backlight module 20 and prevent side light leakage of the display device. The third colloid can be a transparent colloid or a colloid with a high optical density (OD) value. In this embodiment, the material of the third colloid is the same as that of the first colloid. The second connecting portion 60 can be filled with the third colloid into the groove using different types of equipment. Subsequently, the light-shielding bonding layer 40 can be formed using different types of equipment to form the first adhesive on the side of the display panel 10 facing the non-bonding side, the side of the light-shielding layer 32 facing away from the transparent adhesive layer 31, and the second bonding portion 60. These different types of equipment include, but are not limited to, five-axis dispensing equipment with solenoid valve nozzles or electro-hydraulic inkjet printing equipment.

[0090] In the exemplary embodiments, please refer to Figure 9 , Figure 10 and Figure 12 The display device also includes a cover plate 70, which is disposed on the side of the display panel 10 facing away from the backlight module 20. This allows the display device to be adapted to borderless products (e.g., laptops (NBs)), enhancing the full-screen effect and facilitating the achievement of ultra-narrow bezel specifications. The cover plate 70 covers the display panel 10, and the minimum distance from the edge of the cover plate 70 along the direction parallel to the backlight module 20 to the edge of the display panel 10 is greater than or equal to 0.5 mm. A light-shielding connecting layer 40 is connected to the side of the cover plate 70 facing the backlight module 20. This allows the cover plate 70 to have a larger area exposed above the display panel 10, and a larger area for connection with the light-shielding connecting layer 40, improving the connection stability between the cover plate 70, the display panel 10, and the backlight module 20. In this embodiment of the disclosure, the display panel 10 and the backlight module 20 can be components of a liquid crystal module (LCM), and the orthographic projection of the display panel 10 along the direction perpendicular to the backlight module 20 covers the backlight module 20, so that the edge of the cover plate 70 can extend beyond the liquid crystal module, that is, the minimum distance from the edge of the cover plate 70 along the direction parallel to the backlight module 20 to the edge of the liquid crystal module can be greater than or equal to 0.5mm.

[0091] The cover plate 70 is configured to protect the display panel 10 and can be a glass cover plate 70 (CG) made of glass. The cover plate 70 can be bonded to the side of the display panel 10 opposite to the backlight module 20 using optical adhesive 71 (OCA).

[0092] like Figure 9 As shown, the light-shielding connecting layer 40 is an edge-sealing shielding tape. The light-shielding connecting layer 40 is bonded to the side of the base plate 211 facing away from the display panel 10, the light-shielding layer 32, the display panel 10, and the side of the cover plate 70 facing the backlight module 20, respectively. The light-shielding connecting layer 40 can be first bonded to the side of the base plate 211 facing away from the display panel 10, and then positioned using marking lines, sequentially bonded to the light-shielding layer 32, the display panel 10, and the cover plate 70 facing the backlight module 20 from the side of the base plate 211 facing away from the display panel 10. This helps reduce the bezel of the LCD module and avoid light leakage defects, facilitating the achievement of ultra-narrow bezel specifications in the product.

[0093] like Figure 10 As shown, the light-shielding bonding layer 40 is formed by curing the first colloid, which is beneficial for the advancement of automated processes in display devices and reduces cycle time (TT).

[0094] In an exemplary embodiment, such as Figures 11 to 13As shown, the backplate 21 also includes a second baffle 213, which is U-shaped and disposed on the side of the base plate 211 facing the display panel 10 and located on the bonding side. The optical film 23 has a lug 231 located on the bonding side, which is disposed on the second baffle 213. The lug 231 can be a film layer of the optical film 23 extending entirely to the bonding side, or it can be a film layer of the optical film 23 partially extending to the bonding side. The light-incident side 221 of the light guide plate 22 extends into the space enclosed by the U-shaped second baffle 213. Multiple point light sources 252 are located between the light-incident side 221 and the second baffle 213, and within the space enclosed by the U-shaped second baffle 213. The second barrier 213 includes a first barrier portion 2131, a second barrier portion 2132, and a third barrier portion 2133. The first barrier portion 2131 is connected to the base plate 211. The second barrier portion 2132 is located on the side of the first barrier portion 2131 facing the display panel 10 and is spaced apart from the first barrier portion 2131. The third barrier portion 2133 connects the first barrier portion 2131 and the second barrier portion 2132, so that the second barrier 213 has a U-shaped folded edge. A light strip shielding tape 80 is provided on the side of the second barrier portion 2132 facing the first barrier portion 2131, and the lug 231 is connected to the second barrier portion 2132 through the light strip shielding tape 80. The orthographic projection of the light strip shielding tape 80 on the back plate 21 covers the orthographic projection of multiple point light sources 252 on the back plate 21. The second retaining wall portion 2132, on the side opposite to the first retaining wall portion 2131, is bonded to the display panel 10 via cushioning tape 90, increasing the connection area between the display panel 10 and the backlight module 20 and enhancing the cushioning effect on the display panel 10. The cushioning tape 90 may include a cushioning layer and adhesive layers located on opposite sides of the cushioning layer. The material of the cushioning layer may be, but is not limited to, foam or silicone. The cushioning layer is bonded to the display panel 10 and the second retaining wall portion 2132 via the adhesive layers.

[0095] The display device can also wrap the bonding side with an edge-sealing shielding tape layer 214. The edge-sealing shielding tape layer 214 is bonded to the side of the base plate 211 away from the display panel 10, and extends along the second retaining wall 213 to bond with the display panel 10. The edge-sealing shielding tape layer 214 avoids the printed circuit board 215 and the components 216 on the printed circuit board 215 disposed on the side of the base plate 211 away from the display panel 10, so that the printed circuit board 215 and the components 216 disposed on the printed circuit board 215 are located within the space enclosed by the back plate 21 and the edge-sealing shielding tape layer 214, thus protecting the printed circuit board 215 and the components 216 disposed on the printed circuit board 215.

[0096] In the description of this disclosure, it should be noted that the terms "upper", "lower", "one side", "the other side", "one end", "the other end", "side", "opposite", "four corners", "periphery", "'mouth' structure", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the structure referred to has a specific orientation, or is constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.

[0097] In the description of the embodiments of this disclosure, unless otherwise expressly specified and limited, the terms "connection," "direct connection," "indirect connection," "fixed connection," "installation," and "assembly" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. The terms "installation," "connection," and "fixed connection" can refer to a direct connection or an indirect connection through an intermediate medium, or they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.

[0098] While the embodiments disclosed herein are as described above, the content is merely for the purpose of facilitating understanding of this disclosure and is not intended to limit this disclosure. Any person skilled in the art to which this disclosure pertains may make any modifications and changes in the form and details of the implementation without departing from the spirit and scope disclosed herein; however, the scope of patent protection of this disclosure shall still be defined by the appended claims.

Claims

1. A backlight module configured to provide a light source for a display panel, the display panel including a non-bonded side, characterized in that, The backlight module includes: The back plate includes a base plate and a first barrier wall disposed on the side of the base plate facing the display panel, wherein the first barrier wall is located on the non-bonding side; A light guide plate is disposed on the side of the base plate facing the display panel; and An optical film is disposed on the side of the light guide plate away from the base plate. The plane of the optical film facing the base plate is attached to or spaced apart from the surface of the first retaining wall on the side away from the base plate in a direction perpendicular to the base plate.

2. The backlight module according to claim 1, characterized in that, The side of the light guide plate facing the non-bonding side of its orthogonal projection on the base plate is located within the range of the orthogonal projection of the optical film on the base plate, and the minimum distance from the side of the light guide plate facing the non-bonding side of its orthogonal projection on the base plate to the edge of the orthogonal projection of the optical film on the base plate is 0 mm to 1 mm.

3. A display device, characterized in that, include: Display panel; The backlight module as described in claim 1 or 2; and A fixing tape, at least partially located on the non-bonding side, is bonded between the display panel and the optical film and is also bonded to the back plate.

4. The display device according to claim 3, characterized in that, No adhesive frame is provided on the non-bonding side.

5. The display device according to claim 3, characterized in that, The orthographic projection of the display panel along the direction perpendicular to the backlight module covers the backlight module, and the minimum distance from the edge of the orthographic projection of the display panel along the direction parallel to the backlight module to the backlight module is 0.05mm to 0.15mm.

6. The display device according to claim 3, characterized in that, The fixing tape includes a transparent adhesive layer, which includes a first adhesive portion, a second adhesive portion, and a third adhesive portion; The first adhesive portion is bonded between the display panel and the optical film; The second adhesive portion is bonded to the side of the base plate opposite to the display panel; The third adhesive portion is connected between the first adhesive portion and the second adhesive portion and is bonded to the first retaining wall.

7. The display device according to claim 6, characterized in that, The orthographic projections of the display panel, the first adhesive portion, and the optical film on the base plate overlap, and the minimum dimension of the overlapping position along the direction parallel to the base plate is greater than or equal to 0.5 mm.

8. The display device according to claim 6, characterized in that, The minimum dimension of the second adhesive portion projected onto the base plate along a direction parallel to the base plate is greater than or equal to 0.5 mm.

9. The display device according to claim 6, characterized in that, The fixing tape also includes a light-shielding layer, which is bonded to the side of the second adhesive portion away from the base plate and the side of the third adhesive portion away from the first retaining wall.

10. The display device according to claim 9, characterized in that, The display device also includes a light-shielding connection layer; The light-shielding bonding layer is connected to the side of the display panel facing the non-bonded side and the side of the light-shielding layer facing away from the transparent adhesive layer.

11. The display device according to claim 10, characterized in that, The light-shielding layer covers the side of the third adhesive portion facing the light-shielding connection layer; or The third adhesive portion includes a first portion disposed opposite to the light-shielding layer and a second portion disposed opposite to the light-shielding connecting layer, wherein the second portion is connected between the first adhesive portion and the first portion.

12. The display device according to claim 10, characterized in that, The light-shielding bonding layer is configured to be formed by curing a first colloid. The first colloid is a hot melt adhesive or a curing adhesive; and / or The aspect ratio of the light-shielding connecting layer is greater than or equal to 7.

13. The display device according to claim 12, characterized in that, There is a gap between the display panel and the light-shielding connecting layer, and the gap is filled with a first connecting portion, which is configured to be formed by curing a second colloid.

14. The display device according to claim 12, characterized in that, The display panel includes an array substrate, an opposing substrate, an upper polarizer, and a lower polarizer; The opposing substrate is disposed on the side of the array substrate away from the backlight module, the upper polarizer is disposed on the side of the opposing substrate away from the backlight module, and the lower polarizer is disposed on the side of the array substrate facing the back plate. The side of the opposing substrate facing the unbonded side and the side of the upper polarizer facing the unbonded side are projected onto the backlight module.

15. The display device according to claim 14, characterized in that, The side of the array substrate facing the unbonded side and the side of the lower polarizer facing the unbonded side are projected onto the backlight module. The side of the array substrate facing the unbonded side and the side of the opposing substrate facing the unbonded side are projected onto the backlight module. or The orthographic projection of the side of the array substrate facing the non-bonding side onto the backlight module is located on the side of the orthographic projection of the side of the opposing substrate facing the non-bonding side onto the backlight module that is farther away from the non-bonding side. The minimum distance between the orthographic projection of the side of the array substrate facing the non-bonding side onto the backlight module and the orthographic projection of the side of the opposing substrate facing the non-bonding side onto the backlight module is greater than or equal to 0.05 mm. A second connection portion is filled between the array substrate, the lower polarizer, and the light-shielding connection layer. The second connection portion is configured to be formed by curing a third colloid.

16. The display device according to claim 10, characterized in that, The light-shielding connecting layer is edge-sealing shielding tape.

17. The display device according to any one of claims 10 to 16, characterized in that, The display device further includes a cover plate, which is disposed on the side of the display panel opposite to the backlight module; The cover plate covers the display panel, and the minimum distance from the edge of the cover plate to the edge of the display panel along the direction parallel to the backlight module is greater than or equal to 0.5 mm; The light-shielding connecting layer is connected to the side of the cover plate facing the backlight module.

18. The display device according to claim 17, characterized in that, The display panel also includes a bonding side, and the back plate also includes a second retaining wall. The second retaining wall is U-shaped and is disposed on the side of the base plate facing the display panel and located on the bonding side. The optical film has a lug located on the bonding side, and the lug is disposed on the second retaining wall.

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