Backlight module, curved surface display device and splicing display device

Abstract

The invention provides a backlight module, a curved surface display device and a splicing display device. The backlight module comprises a back plate, a light guide assembly, a light bar and a plurality of supporting assemblies. The back plate is bent at least once around a virtual axis parallel to the first direction. The back plate comprises a bottom wall and a side wall arranged around the bottom wall, the bottom wall and the side wall define a containing space, the containing space comprises a center area and a first sinking groove area which extends in the second direction and is located on one side of the center area, and the first sinking groove area makes contact with the side wall. The light guide assembly is arranged in the containing space and does not make contact with the side wall. The light bar is arranged in the first sinking groove area and comprises a substrate and a plurality of light-emitting elements arranged on the substrate, and the light-emitting elements are opposite to the end face, in the thickness direction, of the light guide assembly. And the multiple supporting assemblies are located in the first sinking groove area, are arranged at intervals in the long edge direction and are used for supporting the light guide assembly. According to the backlight module, alignment between the light bar and the light guide assembly is accurate, and light leakage is not prone to occurring.

Description

Technical Field

[0001] The present application relates to the field of curved display technology, and in particular to a backlight module, a curved display device and a spliced ​​display device. Background Art

[0002] In recent years, with the rapid development of technology in the display panel industry, consumers' demand for displays has not only stopped at conventional flat displays, and various special-shaped screens are increasingly available on the market, especially the demand for curved screens. Among curved screens, most display modules use OLED panels, while fewer display modules use liquid crystal display panels. Display panels have some advantages of their own, such as low cost, high yield, and viewing comfort. However, when making liquid crystal display panels into curved screen products, the backlight module needs to be made into a curved module, in which the backplane and light bar can be directly made into a curved form, and the light guide component is generally a flat light guide component that is bent and placed in the backplane. When the light guide component is bent into a curve, there will be a misalignment between the light guide component and the light bar, which will cause light leakage on the liquid crystal display screen. Summary of the invention

[0003] The purpose of the embodiments of the present application is to provide a backlight module, a curved display device and a spliced ​​display device to solve the problem of misalignment between the light bar and the light guide assembly. The specific technical solution is as follows:

[0004] According to a first aspect of the present application, there is provided a backlight module, comprising: a back plate, the back plate being bent at least once around a virtual axis parallel to a first direction, the back plate comprising a bottom wall and side walls arranged around the bottom wall, the bottom wall and the side walls forming a storage space, the storage space comprising a central area and a first groove area located on one side of the central area, the first groove area extending along a second direction and contacting the side wall; the light guide component being arranged in the storage space and not contacting the side wall; the light strip being arranged in the first groove area, comprising a substrate and a plurality of light-emitting elements arranged on the substrate; and a plurality of support components being located in the first groove area and spaced apart along the long side direction, for supporting the light guide component.

[0005] In some embodiments, the support assembly includes a plurality of first support portions, wherein the first support portion is arranged along the thickness direction, one end of the first support portion is supported on the bottom of the light guide assembly, and the other end is connected to the bottom wall; and / or, the support assembly includes a plurality of second support portions, wherein the second support portion is arranged along the short side direction and is located below the light-emitting element, one end of the second support portion is connected to the substrate, and the other end extends to below the light guide assembly and supports the bottom of the light guide assembly.

[0006] In some embodiments, the first support portion and the second support portion are integrally formed.

[0007] In some embodiments, the supporting assembly further includes a limiting portion, which is disposed between the adjacent light-emitting elements, with one end connected to the substrate and the other end abutting against the end surface of the light guide assembly along the thickness direction, the limiting portion being integrally formed with the first supporting portion or the limiting portion being integrally formed with the second supporting portion, the limiting portion being integrally formed with the first supporting portion or the limiting portion being integrally formed with the second supporting portion.

[0008] In some embodiments, the side wall has a flange extending toward the center of the back plate, which is used to limit the base plate of the light bar.

[0009] In some embodiments, the back panel also includes a second groove area, a third groove area and a fourth groove area, the second groove area, the third groove area, the fourth groove area and the first groove area are arranged around the central area, the second groove area is arranged opposite to the first groove area, and is located on the other side of the central area, the third groove area and the fourth groove area extend along the short side direction and are arranged opposite to each other, and elastic supporting members are respectively provided in the second groove area, the third groove area and the fourth groove area; the light guide assembly includes a light guide plate, and the elastic supporting member is supported by the light guide plate.

[0010] A second aspect of the present application provides a curved display device, which includes a display panel and the backlight module described above, wherein the backlight module is disposed below the display panel.

[0011] In some embodiments, the curved display device includes: at least one circuit board; at least one first chip-on-film package, the first chip-on-film package includes a first side and a second side parallel to each other and a third side and a fourth side connecting the first side and the second side, at least the first side and the second side are parallel to each other, at least one of the third side and the fourth side is a hypotenuse, the first side is electrically connected to a first position of the display panel, the second side is electrically connected to a second position of the circuit board, and the orthographic projections of the first position and the second position in the thickness direction at least partially do not overlap.

[0012] In some embodiments, the third side and the fourth side are both hypotenuses.

[0013] In some embodiments, the third side and the fourth side are parallel to each other.

[0014] In some embodiments, each circuit board corresponds to an even number of the first chip-on-film packages, and the even number of the first chip-on-film packages are arranged in mirror symmetry with respect to a central axis of the circuit board.

[0015] In some embodiments, the curved display device also includes a second chip-on-film package, which is arranged between the first chip-on-film packages that are mirror-symmetrical to each other, and the shape of the second chip-on-film package is rectangular. One end of the second chip-on-film package is electrically connected to the display panel, and the other end is electrically connected to the circuit board.

[0016] In some embodiments, the first angle between the first side and the third side is an acute angle, and the second angle between the first side and the fourth side is an obtuse angle; the curved display device is a convex product, and the distance between the fourth sides of the first flip chip film package that are mirror-symmetrical to each other is closer; the curved display device is a concave product, and the distance between the third sides of the first flip chip film package that are mirror-symmetrical to each other is closer.

[0017] In some embodiments, when the radius of curvature of the curved display device is less than or equal to 1500 mm, the second angle is greater than or equal to 120°; when the radius of curvature of the curved display device is greater than or equal to 1500 mm, the second angle is greater than or equal to 100°.

[0018] In some embodiments, the circuit board includes at least a first sub-board and a second sub-board, the first sub-board and the second sub-board are electrically connected through a flexible circuit board, the first sub-board is electrically connected to the display panel through at least one of the first chip-on-film packages, and the second sub-board is electrically connected to the display panel through at least one of the first chip-on-film packages.

[0019] In some embodiments, the flexible circuit board includes a first section, a middle section, and a second section connected in sequence, the first section is electrically connected to the first sub-board, the second section is electrically connected to the second sub-board, and the angle between the first section and the middle section and the angle between the second section and the middle section are greater than or equal to 90°.

[0020] In some embodiments, the display panel includes: a color film substrate, the color film substrate includes a first base substrate, a black matrix provided on the first base substrate, and a filter film of at least one color; an array substrate, arranged in a box with the color film substrate; wherein the curvature of the curved display device is denoted as X, the width of the black matrix is ​​denoted as Z, and the width of the black matrix and the curvature of the curved display device have the following relationship: Z=2(aX 3 +bX 2 -cX+72.5), where a ranges from -8E-09 to -6E-09, b ranges from 2E-05 to 4E-05, and c ranges from 0.0600 to 0.0800.

[0021] In some embodiments, the array substrate includes a pixel electrode, the offset between the pixel electrode and a color filter film is Y, and the black matrix width Z and the offset Y have the following relationship: Z=2Y.

[0022] In some embodiments, the black matrix has a width of 5 μm-35 μm.

[0023] In some embodiments, the curved display device is bent around the virtual axis, and the black matrices located on both sides of the virtual axis gradually increase in width in a direction away from the virtual axis.

[0024] In some embodiments, the widths of the black matrices at positions parallel to the virtual axis and at equal distances from the virtual axis are equal.

[0025] In some embodiments, the display panel includes an upper polarizer and a lower polarizer, the upper polarizer is arranged on a side of the display panel away from the back plate, and the lower polarizer is arranged on a side of the display panel close to the back plate, the upper polarizer and the lower polarizer include polyvinyl alcohol films, and the thickness of the polyvinyl alcohol films is less than 20 μm.

[0026] In some embodiments, the array substrate includes a second base substrate, and the thickness of the first base substrate and the second base substrate is 0.2 mm-0.3 mm.

[0027] A third aspect of the present application provides a spliced ​​display device, which includes at least two of the above-mentioned curved display devices.

[0028] Beneficial effects of the embodiments of the present application:

[0029] The backlight module, curved display device and spliced ​​display device provided by the embodiments of the present application, the backlight module includes a central area and a sinking area arranged around the central area, wherein the area for placing the light bar is called the first sinking area. Due to the existence of the step difference between the first sinking area and the central area, the accommodation space of the first sinking area is increased, which can meet the requirements of the light bar for the layout space. However, due to the increase in the accommodation space, the light guide component has a larger activity space during the bending process, especially for the concave backlight module, the light guide component is prone to sinking during the bending process, which leads to the misalignment between the light guide component and the light emitting element such as LED. Placing the support component at least partially in the second area for supporting the light guide component can reduce the risk of sinking of the light guide component during the bending process, thereby ensuring the accurate alignment between the light emitting element and the light guide component, so that the light emitted by the light emitting element can enter the light guide component, and is emitted after being homogenized by the light guide component, so that the display screen of the display device has uniform brightness and soft colors, and reduces the amount of light directly emitted without the light guide component. Therefore, after the backlight module is matched with the display panel, the light emitted by the light-emitting element can enter the display panel after being homogenized by the light guide component, thereby reducing the possibility of light leakage on the curved display screen.

[0030] Of course, implementing any product or method of the present application does not necessarily require achieving all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other embodiments can also be obtained based on these drawings.

[0032] Figure 1 A top view of the backlight module provided in an embodiment of the present application;

[0033] Figure 2 A front view of the back plate provided in the embodiment of the present application;

[0034] Figure 3 A back view of the back plate provided in the embodiment of the present application;

[0035] Figure 4 It is a schematic diagram of the structure of the back panel, light bar and supporting components;

[0036] Figure 5 for Figure 4 An enlarged schematic diagram of part I;

[0037] Figure 6 For curved display devices Figure 4 Sectional view at the AA position;

[0038] Figure 7 For curved display devices Figure 4 Cross-sectional view of the middle BB position;

[0039] Figure 8 A schematic diagram of the light bar structure provided in an embodiment of the present application;

[0040] Fig. 9 for Figure 8 The enlarged schematic diagram of the middle part II;

[0041] Fig.10 It is a schematic diagram of the position structure of the back panel, light bar and light guide plate;

[0042] Fig.11 for Fig.10 The enlarged schematic diagram of part III;

[0043] Fig.12 for Fig.10 The enlarged schematic diagram of part IV in the middle;

[0044] Fig.13 for Fig.10 The enlarged schematic diagram of part V in the middle;

[0045] Fig.14 For Fig.10 On this basis, a structural diagram of the optical film material is added;

[0046] Fig.15 for Fig.14 The enlarged schematic diagram of part VI in the middle;

[0047] Fig.16 This is a schematic diagram of the explosion structure on the back of the back plate;

[0048] Fig.17 A schematic diagram of the structure of a plastic frame provided in an embodiment of the present application;

[0049] Fig.18 It is the right side axial view of the backlight module;

[0050] Fig.19 For curved display devices Fig.18 Cross-sectional view at the mid-CC position;

[0051] Fig. 20 for Figure 1 Rear view of the backlight module;

[0052] Fig.21 A top view of a curved display device provided in an embodiment of the present application;

[0053] Fig. 22 for Fig.21 An exploded view of the curved display device;

[0054] Fig.23 for Fig.21 Right axial view of the mid-curved display device;

[0055] Fig.24 for Fig.23 A cross-sectional view of the curved display device DD;

[0056] Fig.25 A schematic diagram of an electrical connection structure between a circuit board and a convex display panel in one embodiment is provided for an embodiment of the present application;

[0057] Fig.26 A schematic diagram of an electrical connection structure between a circuit board and a concave display panel in one embodiment is provided for an embodiment of the present application;

[0058] Fig. 27 A schematic diagram of an electrical connection structure between a circuit board and a convex display panel in another embodiment is provided for the embodiment of the present application;

[0059] Fig.28 A schematic diagram of an electrical connection structure between a circuit board and a concave display panel in another embodiment is provided for the embodiment of the present application;

[0060] Fig.29a A schematic diagram of an electrical connection structure between a circuit board segment and a display panel in one embodiment is provided for an embodiment of the present application;

[0061] Fig.29b A schematic diagram of a connection structure between a circuit board segment and a display panel in another embodiment is provided for the embodiment of the present application;

[0062] Fig.30 A schematic diagram of a connection structure between a circuit board and a display panel in another embodiment is provided for the embodiment of the present application;

[0063] Fig.31 A simplified structure of a curved display device and a schematic diagram of light changes provided in an embodiment of the present application;

[0064] Fig.32 A schematic diagram comparing a conventional black matrix provided in an embodiment of the present application and a black matrix of the present application;

[0065] Fig.33 A graph showing the relationship between the offset and the curvature provided in the embodiment of the present application;

[0066] Fig.34 A schematic diagram of the structure of a black matrix provided in an embodiment of the present application;

[0067] Fig.35 A simplified structure of a direct display device and a schematic diagram of light changes provided in an embodiment of the present application.

[0068] The reference numerals are as follows:

[0069] Backlight module 1; back plate 11; long side 111; short side 112; virtual axis 113; bottom wall 114; first reinforcing rib 1141; second reinforcing rib 1142; third reinforcing rib 1143; side wall 115; flange 1151; first slot 1152; protrusion 1153; buckle 1154; elastic supporting member 116; central area 11a; first sinking groove area 11b; second sinking groove area 11c; third sinking groove Area 11d; fourth sink area 11e; light guide assembly 12; light guide plate 121; optical film 122; hanging ear 122a; upper diffuser 1221; composite prism sheet 1222; lower diffuser 1223; reflector 123; light bar 13; substrate 131; light emitting element 132; support assembly 14; first support portion 141; second support portion 142; stopper 143; plastic frame 15; second card slot 151;

[0070] Display panel 2; color filter substrate 21; black matrix 211; conventional black matrix 211'; array substrate 22; upper polarizer 23; lower polarizer 24; trim 25, third slot 251; screw hole 252; foam 253; screw 254; liquid crystal layer 26;

[0071] Circuit board 3; first sub-board 31; second sub-board 32; first chip-on-film package 4; first edge 41; second edge 42; third edge 43; fourth edge 44; second chip-on-film package 5; flexible circuit board 6; first section 61; middle section 62; third section 63; first angle α1; second angle α2. DETAILED DESCRIPTION

[0072] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field based on the present application belong to the scope of protection of the present application.

[0073] In a first aspect, the present application provides a backlight module 1, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 As shown, Figure 1 is a top view of the backlight module 1, Figure 2 is a front view of the back plate 11, Figure 3 is a back view of the back plate 11, Figure 4 is a schematic diagram of the structure of the back panel 11, the light bar 13 and the supporting assembly 14, Figure 5 for Figure 4The enlarged schematic diagram of part I in the figure. The backlight module 1 includes a back plate 11, a light guide component 12, a light bar 13 and a plurality of supporting components 14. The back plate 11 is bent at least once around a virtual axis 113 parallel to the first direction. The back plate 11 includes a bottom wall 114 and a side wall 115 arranged around the bottom wall 114. The bottom wall 114 and the side wall 115 enclose a receiving space. The receiving space includes a central area 11a and a first sinking groove area 11b extending along the second direction and located on one side of the central area 11a. The first sinking groove area 11b is in contact with the side wall 115. The light guide component 12 is arranged in the receiving space and does not contact the side wall 115. The light bar 13 is arranged in the first sinking groove area 11b. The light bar 13 includes a substrate 131 and a plurality of light-emitting elements 132 arranged on the substrate 131. The light-emitting elements 132 are opposite to the end face of the light guide component 12 in the thickness direction. A plurality of support components 14 are located in the first sink area 11b and are arranged at intervals along the long side 111 to support the light guide component 12. The first direction and the second direction are arranged at an angle, and in particular, the first direction and the second direction are perpendicular to each other. The backlight module 1 has an extended length along the first direction and the second direction. Taking the backlight module 1 as a rectangle as an example, the first direction may correspond to the long side 111 of the backlight module 1, and the second direction may correspond to the short side 112 of the backlight module 1.

[0074] It can be understood that the backlight module 1 can be a convex backlight module or a concave backlight module 1. The present application is mainly explained by taking the convex surface as an example, and the curved display device below is also mainly explained by taking the convex display device as an example, wherein the convex backlight module refers to a side for supporting the display panel 2 which is high in the middle and low on both sides, and the concave backlight module refers to a side for supporting the display panel 2 which is low in the middle and high on both sides.

[0075] In this embodiment, the accommodating space includes a central area 11a and a sink area arranged around the central area 11a, the bottom wall 114 opposite to the central area 11a is in contact with the light guide assembly 12, while the bottom wall 114 opposite to the sink area is not in contact with the light guide assembly 12, that is, relative to the light guide assembly 12, the bottom wall 114 opposite to the sink area is more recessed than the bottom wall 114 opposite to the central area 11a. The central area 11a and the sink area are connected, and there is a step difference between the two. The sinking area can be understood as a space surrounded by the inner side wall 115 with a step difference from the central area 11a, the side wall 115 of the back plate 11 itself, and the bottom wall 114 between the inner side wall 115 and the side wall 115 of the back plate 11 itself, wherein the inner side wall 115 can be an inclined wall, one end of the inclined wall is connected to the bottom wall 114 opposite to the central area 11a, and the other end is connected to the bottom wall 114 forming the sinking area. The inner side wall 115 is set as an inclined wall to reduce the bending degree of the sheet metal structure, which is conducive to reducing stress concentration. The area in the sinking area for placing the light bar 13 is called the first sinking area 11b, which extends along the long side 111 and is located on one side of the central area 11a.

[0076] Due to the step difference between the first sinking groove area 11b and the central area 11a, its own accommodation space is increased, which can meet the layout space requirements of the light bar 13. However, due to the larger accommodation space, the light guide component 12 has a larger activity space during the bending process, especially for the concave backlight module 1, the light guide component 12 is prone to sinking during the bending process, which leads to misalignment between the light guide component 12 and the light-emitting element 132 such as LED. Placing the support component 14 at least partially in the second area to support the light guide component 12 can reduce the risk of the light guide component 12 sinking during the bending process, thereby ensuring the accurate alignment between the light-emitting element 132 and the light guide component 12, so that the light emitted by the light-emitting element 132 can enter the light guide component 12, and is emitted after being homogenized by the light guide component 12, so that the display screen of the display device has uniform brightness and soft colors, and reduces the amount of light directly emitted without the light guide component 12. Therefore, after the backlight module 1 is matched with the display panel 2, the light emitted by the light-emitting element 132 can enter the display panel 2 after being homogenized by the light guide component 12, thereby reducing the possibility of light leakage on the curved display screen.

[0077] In addition, the backlight module 1 generally adopts a sheet metal structure, and a sink area is set around the central area 11a, which can also improve the strength of the back plate 11. This is because the sheet metal structure can not only increase the physical support points of the sheet metal, but also disperse the stress and reduce the possibility of deformation and cracking by adding bending, flanging 1151 or reverse bending and pressing processes, so it can effectively improve its own strength.

[0078] The light bar 13 can be one, two or more light bar 13. When there are two or more light bar 13, the virtual axis 113 for bending the backlight module 1 can be used as the dividing point, with one light bar on each side of the virtual axis 113. This can reduce the bending stress on the light bar 13 and help extend the service life of the light bar 13.

[0079] In some embodiments of the present application, Figure 5 , Figure 6 , Figure 7 As shown, the support assembly 14 includes a plurality of first support portions 141, which are arranged along the thickness direction, one end of which is supported on the bottom of the light guide assembly 12, and the other end of which is connected to the bottom wall 114. And / or, the support assembly 14 includes a plurality of second support portions 142, which are arranged along the short side 112 and are located below the light emitting element 132, one end of which is connected to the substrate 131, and the other end of which extends to the bottom of the light guide assembly 12 and supports the bottom of the light guide assembly 12. That is, the support assembly 14 may include only the first support portion 141 or only the second support portion 142, or may include both the first support portion 141 and the second support portion 142.

[0080] The first supporting portion 141 is separately provided, such as Figure 7 As shown, the first support portion 141 is directly disposed between the bottom wall 114 and the light guide assembly 12, has a simple structure, and does not affect the light bar 13. The first support portion 141 and the light guide assembly 12 can be bonded or abutted, etc. The first support portion 141 and the bottom wall 114 can be bonded, welded or clamped, etc. For clamping the bottom wall 114, a groove can be provided, and the first support portion 141 is provided with a buckle 1154.

[0081] The second supporting portion 142 is separately provided, such as Figure 6 As shown, the second support portion 142 is located below the light guide assembly 12, one end of which is connected to the substrate 131 of the light bar 13, and the other end is directly supported on the end of the light guide assembly 12, which can better ensure that the light emitting element 132 of the light bar 13 is arranged opposite to the end surface of the light guide assembly 12. The second support portion 142 and the substrate 131 can be bonded or welded, and the second support portion 142 and the light guide assembly 12 can be bonded or abutted.

[0082] The first support portion 141 and the second support portion 142 are provided simultaneously. Figure 5 As shown, the support area of ​​the light guide assembly 12 can be increased, thereby further reducing the risk of the light guide assembly 12 sinking when being bent.

[0083] In some embodiments of the present application, the first support portion 141 and the second support portion 142 are arranged at intervals along the long side 111 and / or the short side 112 .

[0084] The first support portion 141 and the second support portion 142 are arranged at intervals, and can support the light guide component 12 at different positions, thereby ensuring that the light guide component 12 is bent evenly as a whole, reducing the possibility of local sinking, and thus reducing the incidence of light leakage. In addition, the first support portion 141 and the second support portion 142 are arranged at intervals, which can also reduce the risk of interference between them, and is conducive to increasing the size of the first support portion 141 and the second support portion 142, so that the first support portion 141 and the second support portion 142 both have a larger area for supporting the light guide component 12, reducing the probability of the light guide component 12 sinking.

[0085] The spacing arrangement may be that the first support portion 141 and the second support portion 142 are spaced apart along the long side 111, or that the first support portion 141 and the second support portion 142 are spaced apart along the short side 112. Of course, the first support portion 141 and the second support portion 142 may be spaced apart along both the long side 111 and the short side 112, that is, the two are spaced apart and arranged in a staggered manner, such as Figure 5 shown.

[0086] The two are arranged at intervals or staggered at intervals along the long side 111 , which is more conducive to the dispersed arrangement of the first support portion 141 and the second support portion 142 .

[0087] Preferably, the first support portion 141 and the second support portion 142 are arranged in a staggered manner, so that the first support portion 141 and the second support portion 142 are arranged at more dispersed positions, and the light guide component 12 can be supported at different positions, thereby reducing the risk of the light guide component 12 sinking, thereby reducing the incidence of light leakage. When the first support portion 141 and the second support portion 142 are arranged in a staggered manner, the interval between adjacent first support portions 141 can be 3mm-5mm, such as Figure 5 As shown, for example, it may be 3 mm, 4 mm or 5 mm, so as to reserve enough space for the arrangement of the second supporting portion 142 .

[0088] It should be noted that, no matter the first support portion 141 and the second support portion 142 are provided separately or simultaneously, a plurality of them are evenly dispersed along the long side 111 of the back plate 11 , thereby ensuring accurate alignment between the light guide assembly 12 and the light emitting element 132 .

[0089] In some embodiments of the present application, the first support portion 141 and the second support portion 142 are integrally formed.

[0090] In this embodiment, the first support portion 141 and the second support portion 142 are integrally formed, that is, the two are combined into one, and the first support portion 141 is supported on the bottom of the light guide component 12. Relative to the first support portion 141, the second support portion 142 is supported on the bottom of the light guide component 12 closer to the edge. The two work together to better reduce the risk of sinking of the light guide component 12, and ensure that the light-emitting element 132 of the light bar 13 is arranged opposite to the end face of the light guide component 12, thereby reducing the probability of light leakage on the curved display screen caused by the backlight module 1 being applied to the curved display screen.

[0091] In some embodiments of the present application, Figure 5 As shown, the first support portion 141 is made of an elastic material, such as a silicone material or a rubber material. In this way, the first support portion 141 has a certain degree of compressibility, and while playing a supporting role, it allows the light guide component 12 to be slightly deformed, reducing the risk of stress concentration in the light guide component 12 and playing a role in protecting the light guide component 12.

[0092] As a feasible implementation method, Figure 5 As shown, the first support portion 141 can be in the shape of a long strip and is arranged at intervals in the first sink area 11b. The interval between the two first support portions 141 is at least 4 nm, so that the second support portion 142 can be arranged between the intervals of the first support portions 141 and bonded to the substrate 131 of the light bar 13 to avoid mutual interference between the two. The long strip-shaped first support portion 141 is arranged in sections, which is conducive to reducing the stress generated when it is distributed in the bent back plate 11. The length of the first support portion 141 can be between 120mm-150mm, such as 120mm, 130mm, 140mm, 150mm, etc. The size of the second support portion 142 can be 2mm*1.2mm*2mm, and it is made of transparent polycarbonate (PC) material. The second support portion 142 is distributed at approximately 0.3mm below the light-emitting element 132, and one is set every 120-mm150mm. The interval between the second support portions 142 depends on the length of the first support portion 141. For example, when the length of the first support portion 141 is 140mm, the interval between the second support portions 142 is approximately 140mm.

[0093] In some embodiments of the present application, Figure 8 , Fig. 9 As shown, the support assembly 14 also includes a limiting portion 143, which is arranged between adjacent light-emitting elements 132, one end of which is connected to the substrate 131, and the other end is arranged toward the end surface of the light guide assembly 12 along the thickness direction. The height of the limiting portion 143 is greater than the height of the light-emitting element 132.

[0094] In this embodiment, the height of the limiter 143 and the height of the light emitting element 132 both refer to the dimension along the short side 112. The limiter 143 is disposed between adjacent light emitting elements 132 and is disposed toward the end surface of the light guide assembly 12 along the thickness direction. The height of the limiter 143 is greater than the height of the light emitting element 132, which can prevent the light emitting element 132 from contacting the light guide assembly 12, prevent the light guide assembly 12 from damaging the light emitting element 132, and protect the light emitting element 132.

[0095] The limiting portion 143 can be abutted or bonded to the end surface of the light guide component 12 along the thickness direction. In this way, the limiting portion 143 can also fix the light guide component 12 and reduce the risk of displacement of the light guide component 12 along the short side 112.

[0096] In some embodiments of the present application, the limiting portion 143 is integrally formed with the first support portion 141 or the limiting portion 143 is integrally formed with the second support portion 142. The limiting portion 143 is integrally formed with the first support portion 141 or the limiting portion 143 is integrally formed with the second support portion 142, so that each support assembly 14 can prevent the light guide assembly 12 from damaging the light emitting element 132, fix the light guide assembly 12 in the direction of the short side 112, and prevent the light guide assembly 12 from sinking when bent. Moreover, since the limiting portion 143 and the first support portion 141 or the limiting portion 143 and the second support are integrally formed, multiple functions can be obtained through only one installation.

[0097] In some embodiments of the present application, Fig.10 and Fig.11 As shown, Fig.10 is a schematic diagram of the position structure of the back panel 11, the light bar 13 and the light guide plate 121, Fig.11 for Fig.10 The enlarged schematic diagram of part III is shown in the figure. Fig.11 It can be seen that the side wall 115 has a flange 1151 extending toward the center of the back plate 11, which is used to limit the substrate 131 of the light bar 13. In this embodiment, the side wall 115 refers to the side wall 115 corresponding to the first sink area 11b, that is, the side wall 115 located on the outside of the light bar 13. By setting the flange 1151, the light bar 13 can be limited to prevent the light bar 13 from moving up, ensuring the accurate alignment between the light bar 13 and the light guide component 12. Among them, the flange 1151 can be set in sections, which can save costs on the one hand and reduce the risk of interference with other components on the other hand.

[0098] Optionally, the width of the flange 1151 is less than or equal to the thickness of the substrate 131, which does not affect the assembly of other components such as the light guide assembly 12, and can limit the upper position of the substrate 131 of the light bar 13. The width of the flange 1151 and the thickness of the substrate 131 both refer to the dimensions along the short side 112.

[0099] Optionally, the width of the flange 1151 may be less than or equal to 1 mm, for example, 1 mm, 0.9 mm, 0.8 mm, 0.7 mm, etc. As a feasible embodiment, the width of the flange 1151 is consistent with the thickness of the substrate 131 of the light bar 13, both of which are 1 mm, which can better limit the substrate 131 without affecting the assembly of other components.

[0100] In some embodiments of the present application, Figure 4 , Fig.10 and Fig.12 , Fig.13 The back panel 11 also includes a second groove area 11c, a third groove area 11d and a fourth groove area 11e. The second groove area 11c, the third groove area 11d, the fourth groove area 11e and the first groove area 11b are arranged around the central area 11a. The second groove area 11c is arranged opposite to the first groove area 11b and is located on the other side of the central area 11a. The third groove area 11d and the fourth groove area 11e extend along the short side 112 and are arranged opposite to each other. Elastic supporting members 116 are respectively provided in the second groove area 11c, the third groove area 11d and the fourth groove area 11e; the light guide assembly 12 includes a light guide plate 121, and the elastic supporting member 116 is supported by the light guide plate 121.

[0101] In this embodiment, the second groove area 11c, the third groove area 11d and the fourth groove area 11e are provided with elastic supporting members 116 to support the end of the light guide plate 121, and combined with the limiting portion 143 to limit the end of the light guide plate 121, the light guide plate 121 can be limited along the long side 111 and the short side 112, thereby reducing the possibility of displacement of the light guide plate 121.

[0102] The elastic supporting member 116 refers to a component made of elastic material, such as silicone, rubber, foam, etc., which will not cause damage to the light guide plate 121 when supporting the light guide plate 121 .

[0103] Optionally, two or more elastic resisting members 116 may be provided in the second sinking groove area 11c, the third sinking groove area 11d and the fourth sinking groove area 11e, and one elastic resisting member 116 may be provided at the corner of the second sinking groove area 11c and the third sinking groove area 11d and at the corner of the second sinking groove area 11c and the fourth sinking groove area 11e, such as Fig.10 , Fig.12 , Fig.13 The elastic supporting member 116 can be bonded to the preset position by bonding.

[0104] It should be noted that the first sinking groove area 11b, the third sinking groove area 11d, the second sinking groove area 11c and the fourth sinking groove area 11e can be interconnected to simplify the molding process.

[0105] In some embodiments of the present application, Fig.14 , Fig.15 As shown, the light guide assembly 12 also includes an optical film material 122, which is disposed on a side of the light guide plate 121 away from the back plate 11, and a hanging ear 122a is provided on at least one side of the optical film material 122 adjacent to or opposite to the light bar 13, and a first card slot 1152 is provided at a position of the back plate 11 opposite to the hanging ear 122a, and the hanging ear 122a cooperates with the first card slot 1152 to limit the displacement of the optical film material 122.

[0106] Among them, Figure 7 As shown, the optical film 122 includes an upper diffuser 1221, a composite prism sheet 1222 and a lower diffuser 1223, and the lower diffuser 1223 is attached to the light guide plate 121. It should be noted that the light guide assembly 12 also includes a reflective sheet 123, which is located on the side of the light guide plate 121 close to the back plate 11.

[0107] like Fig.14 As shown, the optical film material 122 is provided with a hanging ear 122a on one or both sides adjacent to the light strip 13, and the hanging ear 122a is engaged with the first card slot 1152 on the back panel 11, which can limit the optical film material 122 along the short side 112 direction, reduce the possibility of displacement of the optical film material 122, and ensure the light output effect of the backlight module 1.

[0108] like Fig.14 As shown, the optical film material 122 is provided with a hanging ear 122a opposite to the light strip 13, and the hanging ear 122a is engaged with the first slot 1152 on the back panel 11, which can limit the optical film material 122 along the long side 111 direction, reduce the possibility of displacement of the optical film material 122, and ensure the light output effect of the backlight module 1.

[0109] like Fig.14 As shown, the optical film material 122 can be provided with hanging ears 122a on both sides adjacent to the light bar 13 and on the side opposite to the light bar 13. The hanging ears 122a are engaged with the first card slot 1152 on the back plate 11, and the optical film material 122 can be limited in the direction of the short side 112 and the long side 111 at the same time, so as to better reduce the possibility of displacement of the optical film material 122 and ensure the light output effect of the backlight module 1. In addition, on the side where the light bar 13 is located, the limiting portion 143 can abut against the end of the optical film material 122, so as to better limit the optical film material 122.

[0110] In some embodiments of the present application, reference Figure 3 , Figure 4 and Fig.16, the bottom wall 114 includes at least one reinforcing rib. By providing the reinforcing rib, the strength of the back plate 11 can be improved. Among them, the back plate 11 can be made of aluminum back plate 11, which has the advantages of light weight and good heat dissipation. Compared with conventional SECC / SGLC and other steel back plates 11, the temperature is reduced by about 15-20°C and the weight is reduced by about 60%. The specific temperature reference simulation formula is as follows: T = (T 参考 -T 环境 )×[LED Power 评估 ×LED Pitch 参考 / (LEDPower 参考 ×LED Pitch 评估 )]+T 环境 , where LED power is the power of a single LED on the light strip 13, and LED Pitch is the distance between the centers of two adjacent LEDs.

[0111] It is understandable that the reinforcing ribs may extend only in the central area 11 a , or may extend to the sink area but not contact the side wall 115 , or may extend to contact the side wall 115 .

[0112] Optionally, refer to Figure 3 , Figure 4 The reinforcing ribs are arranged in the central area 11a and include at least one first reinforcing rib 1141 extending along the long side 111.

[0113] Alternatively, refer to Figure 3 , Figure 4 The reinforcing rib is arranged in the central area 11a and includes at least one second reinforcing rib 1142 extending along the short side 112.

[0114] Alternatively, refer to Figure 3 , Figure 4 The reinforcing ribs are arranged in the central area 11a, and include at least one first reinforcing rib 1141 and at least one second reinforcing rib 1142. The first reinforcing rib 1141 and the second reinforcing rib 1142 are arranged at the same time, so as to further improve the strength of the back plate 11.

[0115] Optionally, refer to Figure 3 , Figure 4 and Fig.16 The reinforcing ribs also include a third reinforcing rib 1143 hanging on the outside of the bottom wall 114, wherein the third reinforcing rib 1143 is arranged corresponding to the first reinforcing rib 1141, which can improve the strength of the back plate 11 and prevent the back plate 11 from deforming. The third reinforcing rib 1143 can be a reinforcing rib made of steel. The outside here refers to the side where the optical component is not set, and the side where the optical component is set is the inner side of the bottom wall 114.

[0116] As a feasible implementation method, refer to Figure 3 , Figure 4 The bottom wall 114 includes two first reinforcing ribs 1141 and a plurality of second reinforcing ribs 1142 disposed between the two first reinforcing ribs 1141 , such as 3 or 4 second reinforcing ribs.

[0117] By providing two transverse first reinforcing ribs 1141 and a plurality of vertical second reinforcing ribs 1142, the strength of the back plate 11 can be further improved. The two first reinforcing ribs 1141 can be provided in the center area 11a near the edge of the long side 111 of the back plate 11, and the second reinforcing ribs 1142 are provided between the two first reinforcing ribs 1141, so that the first reinforcing ribs 1141 and the second reinforcing ribs 1142 can be connected and penetrated, thereby further improving the strength of the back plate 11.

[0118] Further, refer to Fig.16 A third reinforcing rib 1143 having a conformal structure similar to the first reinforcing rib 1141 may be attached to the outside of the bottom wall 114 at a position opposite to the first reinforcing rib 1141 to prevent deformation of the back plate 11. The third reinforcing rib 1143 made of steel may be fastened to the back plate 11 by screws.

[0119] In some embodiments of the present application, reference Fig.17 , Fig.18 , Fig.19 , Fig. 20 As shown, the backlight module 1 further includes a plastic frame 15 . The plastic frame 15 is disposed on a side of the light guide assembly 12 away from the back plate 11 . The plastic frame 15 is snap-fitted with the back plate 11 .

[0120] The plastic frame 15 is snap-fitted with the back plate 11, which has the advantage of simple structure and can simplify the assembly method. Fig.19 , Fig. 20 The side wall 115 of the back plate 11 may be provided with a protrusion 1153 protruding away from the center of the back plate 11 , and the plastic frame 15 is provided with a second slot 151 at a corresponding position, and the protrusion 1153 cooperates with the second slot 151 , so that the plastic frame 15 is engaged with the back plate 11 .

[0121] Among them, Fig.17 As shown, the plastic frame 15 can be made of PC (polycarbonate) + glass fiber, with an integrated structural design, and the four sides of the plastic frame are respectively provided with protrusions 1153 structures, for example, evenly distributed on the four sides at intervals of 80 to 100 mm. The plastic frame 15 bends the planar optical film material 122 and the light guide plate 121 into a curved surface, and the multiple protrusions 1153 design can strengthen the fixation of the back plate 11 and the plastic frame 15 to prevent the light guide plate 121 from jumping off.

[0122] A second aspect of the present application provides a curved display device, such as Fig.21 , Fig. 22 As shown, the curved display device includes the backlight module 1 and the display panel 2 mentioned above, and the backlight module 1 is placed below the display panel 2 .

[0123] In this embodiment, the backlight module 1 of the curved display device is provided with the support assembly 14 to ensure the alignment accuracy between the light emitting element 132 of the light bar 13 and the light guide assembly 12, so that light leakage of the curved display device due to misalignment is not likely to occur.

[0124] It should be noted that if Figure 2 , Fig.23 , Fig.24 As shown, the curved display device also includes a bezel 25. The bezel can be made of 0.8t SECC (Electrolytic Galvanized Cold Rolled Steel), an integrated curved structure design, and is stamped and integrally formed. The four folded edges on the side are respectively provided with a third card slot 251 or a screw hole 252. The back plate 11 is provided with a corresponding buckle 1154. The two are snap-fitted and then fixed by screws 254. The display panel 2 is embedded in the bezel, and foam 253 is attached to the inside of the bezel to prevent the display panel 2 from being scratched during the assembly process. The bezel can adopt a design in which the four front frames are equal, and can be spliced ​​with other products in either horizontal or vertical directions. Foam 253 is also provided between the display panel 2 and the plastic frame 15 to prevent the display panel 2 from being scratched.

[0125] In some embodiments of the present application, the curved display device includes: at least one circuit board 3 and at least one first chip-on-film package 4, such as Fig.25 , Fig.26 As shown, each circuit board 3 corresponds to two first COF packages 4. The first COF package 4 includes a first side 41 and a second side 42 parallel to each other, and a third side 43 and a fourth side 44 connecting the first side 41 and the second side 42, at least the first side 41 and the second side 42 are parallel to each other, at least one of the third side 43 and the fourth side 44 is a hypotenuse, the first side 41 is electrically connected to a first position of the display panel 2, the second side 42 is electrically connected to a second position of the circuit board 3, and the orthographic projections of the first position and the second position in the thickness direction at least partially do not overlap.

[0126] In this embodiment, the circuit board 3 is made of a hard material and is not flexible, while the display panel 2 is flexible. In the manufacturing process of the curved display device, because one end of the first COF package 4 is connected to the display panel 2 and the other end is connected to the circuit board 3, the circuit board 3 can only produce a slight deformation and cannot completely follow the display panel 2 to bend to the curvature required by the curved display device. The stress generated during the bending process will accumulate in the first COF package 4, causing damage, and ultimately resulting in poor display of the curved display device. The circuit board 3 is electrically connected to the display panel 2 through at least one first COF package 4. Since at least one of the third side 43 and the fourth side 44 of the first COF package 4 is a bevel, the connection positions corresponding to the first side 41 and the second side 42, i.e., the first position and the second position, at least partially do not overlap. Therefore, the first COF package 4 and its corresponding part have the ability to deform independently, which can reduce the tearing force on the first COF package 4 to a certain extent. Thereby, the circuit of the driving chip on the first COF package 4 and the normal display function of the curved display device can be maintained.

[0127] This embodiment does not limit the number of first chip-on-film packages 4 electrically connected to one end of each circuit board 3, but adjusts the number according to the actual product or process requirements. In addition, the number of first chip-on-film packages 4 may be different according to the distance from the virtual axis 113 of the curved display device. For example, the number of first chip-on-film packages 4 connected to the circuit board 3 is small at the position close to the virtual axis 113 of the curved display device, while the number of first chip-on-film packages 4 connected to the circuit board 3 is large at the position far from the virtual axis 113 of the curved display device.

[0128] In some embodiments of the present application, Fig.25 , Fig.26 As shown, the third side 43 and the fourth side 44 are both beveled sides. Both sides are beveled sides, and the first chip-on-film package 4 has non-overlapping parts on both sides of the middle overlapping part between the first position and the second position, which increases the area of ​​the first chip-on-film package 4 that can be deformed independently, thereby reducing the tearing force on the first chip-on-film package 4 during the bending process of the curved display device, and reducing the probability of the first chip-on-film package 4 being damaged due to tearing.

[0129] In some embodiments of the present application, Fig.25 , Fig.26 As shown, the third side 43 and the fourth side 44 are parallel to each other, that is, the shape of the first COF package 4 is a parallelogram. This can not only simplify the manufacturing difficulty of the first COF package 4, but also reduce the tearing force on the first COF package 4.

[0130] In some embodiments of the present application, Fig.25 , Fig.26 As shown, each circuit board 3 corresponds to an even number of first chip-on-film packages 4, and the even number of first chip-on-film packages 4 are arranged symmetrically with respect to the central axis of the circuit board 3. The first chip-on-film packages 4 are arranged in an even number and are arranged symmetrically with respect to the mirror surface. On the one hand, the force on each first chip-on-film package 4 can be kept uniform, and on the other hand, the curvature change of the curved display device can be better adapted to reduce the tearing force on the first chip-on-film package 4. In some embodiments of the present application, such as Fig. 27 , Fig.28 As shown, the curved display device also includes a second chip-on-film package 5, which is arranged between the first chip-on-film packages 4 that are mirror-symmetrical to each other. The second chip-on-film package 5 is rectangular in shape, and one end of the second chip-on-film package 5 is electrically connected to the display panel 2, and the other end is electrically connected to the circuit board 3.

[0131] In this embodiment, the circuit board 3 is electrically connected to the display panel 2 through an even number of first chip-on-film packages 4 and one second chip-on-film package 5. The second chip-on-film package 5 is located between the first chip-on-film packages 4. The second chip-on-film package 5 is rectangular, which is beneficial to balancing the force uniformly on the first chip-on-film packages 4 on both sides and avoiding mutual tearing between the chip-on-film packages, thereby helping to reduce the stress accumulated by deformation, and further maintaining the circuit of the driving chip on the chip-on-film package and the normal display function of the curved display device.

[0132] In some embodiments of the present application, the first angle α1 between the first side 41 and the third side 43 is an acute angle, and the second angle α2 between the first side 41 and the fourth side 44 is an obtuse angle; the curved display device is a convex product, such as Fig.25 As shown, the distance between the fourth sides 44 of the first flip chip film packages 4 which are mirror-symmetrical to each other is closer; the curved display device is a concave product, such as Fig.26 As shown, the distance between the third sides 43 of the first flip chip packages 4 which are mirror-symmetrical to each other is closer.

[0133] According to the different bending directions of the display surface of the curved display device, the bonding direction of the first chip-on-film package 4 is adjusted, so as to effectively reduce the tearing deformation of the first chip-on-film package 4 caused by the bending deformation.

[0134] In some embodiments of the present application, when the radius of curvature of the curved display device is less than or equal to 1500 mm, the second angle is greater than or equal to 120°, for example, it can be 120°, 130°, 140°, 150°, etc.; when the radius of curvature of the curved display device is greater than or equal to 1500 mm, the first angle α1 and the second angle α2 are less than or equal to 100°, for example, they can be 100°, 110°120°, 130°, 145°, 150°, etc.

[0135] The larger the radius of curvature of the curved display device, the smaller the degree of bending of the curved display device, and the smaller the radius of curvature of the curved display device, the larger the degree of bending of the curved display device. When the bending degree of the curved display device is large, setting the second angle α2 to be greater than or equal to 120° can effectively reduce the tearing deformation of the first COF package 4 caused by the bending deformation. When the bending degree is small, the setting range of the second angle α2 can be expanded to be greater than or equal to 100°, and within this range, the tearing deformation of the first COF package 4 caused by the bending deformation can be effectively reduced.

[0136] In other embodiments of the present application, Fig.29a As shown, the curved display device includes: the circuit board 3 includes at least a first sub-board 31 and a second sub-board 32, the first sub-board 31 and the second sub-board 32 are electrically connected through a flexible circuit board 6, the first sub-board 31 is electrically connected to the display panel 2 through at least one first chip-on-film package 4, and the second sub-board 32 is electrically connected to the display panel 2 through at least one first chip-on-film package 4.

[0137] In this embodiment, the circuit board 3 is divided into multiple sections, such as a first sub-board 31 and a second sub-board 32, and each section of the circuit board is connected by a flexible circuit board 6. Each section of the circuit board is electrically connected to the display panel 2 through at least one first flip chip package 4. Fig.29a Each circuit board segment is electrically connected to the display panel 2 through two first chip-on-film packages 4. The driving circuit is constructed in a segmented and grouped manner, so that each circuit board segment and multiple flexible circuit boards 6 can move along the bending curvature of the display panel 2 when the display panel 2 is bent, and stress will not be accumulated due to the bending of the display panel 2, thereby avoiding damage to the circuits of the first chip-on-film package 4 and the circuit board 3, and ensuring the normal display of the curved display device.

[0138] It is understandable that each circuit board 3 can also be electrically connected to the display panel 2 through at least one second chip-on-film package 5. Fig.29b As shown, the first sub-board 31 and the second sub-board 32 are both electrically connected to the display panel 2 through two second COF packages 5. Since the circuit board 3 is arranged in sections, the length of each section of the circuit board is reduced, and the bending degree during the bending process is also reduced, so the stress on the COF package is also reduced, and a conventional shape, such as a rectangular second COF package 5 can be used, which can reduce the difficulty of manufacturing the COF package. And since the second COF package 5 has a regular shape, it is convenient to electrically connect with the display panel 2 and the circuit board 3.

[0139] In some embodiments of the present application, Fig.29a , Fig.29b and Fig.30As shown, the flexible circuit board 6 includes a first section 61, a middle section 62 and a second section 63 connected in sequence, the first section 61 is electrically connected to the first sub-board 31, the second section 63 is electrically connected to the second sub-board 32, and the angle between the first section 61 and the middle section 62 and the angle between the second section 63 and the middle section 62 are greater than or equal to 90°.

[0140] Among them, the angle between the first section 61 and the middle section 62 of the flexible circuit board 6, and the angle between the second section 63 and the middle section 62 are greater than or equal to 90°, which is conducive to the deformation of the flexible circuit board 6 and can reduce the stress generated when the display panel 2 is deformed, thereby reducing the tearing of the chip-on-film package and reducing the risk of damage to the chip-on-film package.

[0141] It can be understood that the display panel 2 can be a LED (Light Emitting Diode, semiconductor light emitting diode) panel or an LCD (Liquid Crystal Display Panel, liquid crystal display) panel, and the present application does not impose any limitation on this.

[0142] Taking the display panel 2 as an LCD panel as an example, in some embodiments of the present application, Fig.31 , Fig.32 As shown, the display panel 2 includes a color filter substrate 21 and an array substrate 22. The color filter substrate 21 includes a first base substrate 131 (not shown in the figure), a black matrix 211 disposed on the first base substrate 131, and a filter film of at least one color (not shown in the figure); the array substrate 22 and the color filter substrate 21 are arranged in a box 22. The curvature of the curved display device is denoted as X, the width of the black matrix 211 is denoted as Z, and the width of the black matrix 211 and the curvature of the curved display device have the following relationship: Z=2(aX 3 +bX 2 -cX+72.5), where a ranges from -8E-09 to -6E-09, b ranges from 2E-05 to 4E-05, and c ranges from 0.0600 to 0.0800.

[0143] As a feasible implementation, Y = -7E-09x 3 +3E-05x 2 -0.0708x+72.5.

[0144] Among them, the black matrix and the filter film are arranged at intervals. Optionally, the color filter substrate 21 includes three colors of filter films, namely red filter film, green filter film and blue filter film; a liquid crystal layer 26 is arranged between the array substrate 22 and the color filter substrate 21, and the liquid crystal layer 26 includes a plurality of liquid crystal units, each liquid crystal unit corresponds to a color of filter film, and each pixel electrode drives a liquid crystal unit to deflect, and after the filter film acts, the corresponding color of light is emitted.

[0145] In this embodiment, when the display panel 2 is bent, the array substrate 22 and the color film substrate 21 will inevitably shift. The shift of the array substrate 22 and the color film substrate 21 causes the pixel electrodes on the array substrate 22 and the filter film on the color film substrate 21 to shift in position, resulting in the phenomenon that other pixels are also driven when a certain pixel is driven; for example, when driving a green pixel, the liquid crystal corresponding to the red or blue filter film is deflected, resulting in an uneven display of yellow or purple on the screen. Moreover, the offset amount of the position close to the virtual axis 113 is different from that of the position far from the virtual axis 113. As the offset amount is different, the degree of cross-color is also different, which seriously affects the display effect of the curved display device. In order to solve this problem, this embodiment increases the width of the black matrix 211 so that the black matrix 211 can block the abnormal light output caused by the pixel offset to avoid cross-color. Fig.32 As shown in the figure, 211' is the width of the conventional black matrix 211' of the non-curved display device, and 211 is the width of the black matrix 211 of the curved display device in the present application. Compared with the two, the width of the black matrix 211 calculated according to the above formula is increased because the influence of the curvature is taken into account, which can avoid cross-color.

[0146] In some embodiments of the present application, the array substrate 22 includes a pixel electrode, and the offset between the pixel electrode and a color filter film is Y=aX 3 +bX 2 -cX+72.5, where a ranges from -8E-09 to -6E-09, b ranges from 2E-05 to 4E-05, and c ranges from 0.0600 to 0.0800. That is, the width Z of the black matrix 211 and the offset Y have the following relationship: Z=2Y.

[0147] According to the relationship between the offset and the curvature of the curved display device, when the curvature X is known, the offset value can be calculated, and the offset value can be multiplied by 2 to obtain the value of the width Z of the black matrix 211. In this way, after the display panel 2 is bent, since the width of the black matrix 211 takes into account the offset between the pixel electrode and the filter film, cross-color can be effectively avoided.

[0148] like Fig.33 As shown in the figure, the dotted line is the offset Y value calculated according to the above formula, and the solid line is the actual measured offset value, and the two can fit well. Among them, for the display panel 2 with a curvature of R1000, the measured offset value is 30μm, the display panel 2 with a curvature of R1500, the measured offset value is 22.5μm, the display panel 2 with a curvature of R2000, the measured offset value is 17.5μm, and the display panel 2 with a curvature of R2500, the measured offset value is 10μm. The offset decreases as the curvature increases, and this rule conforms to conventional logic.

[0149] It should be noted that the above offset value has nothing to do with whether the display panel is convex or concave, but is only related to the curvature of the display panel 2 .

[0150] In some embodiments of the present application, the width of the black matrix 211 is 5 μm-35 μm. A suitable width of the black matrix 211 can be selected according to the curvature of the curved display device.

[0151] In some embodiments of the present application, the curved display device is bent around the virtual axis 113, and the widths of the black matrix 211 at positions parallel to the virtual axis 113 and at equal distances from the virtual axis 113 are equal, such as Fig.34 shown. Fig.34 In order to illustrate the width change of the black matrix 211 in the direction of the arrow in the figure, it is flattened for illustration.

[0152] In this embodiment, this is because at the same distance from the virtual axis 113, Fig.34 The position of a certain column of the black matrix 211 is shown in the figure. The direction of the column is parallel to the direction of the virtual axis 113. For the same column of the black matrix 211, the difference between the color film substrate 21 and the array substrate 22 is the same. Setting the width of the black matrix 211 to be the same can effectively block the light leakage caused by the offset, and can reduce the width of the black matrix 211 at different positions to the required value, which is beneficial to improve the aperture ratio of the display panel 2 and improve the display of the display panel 2.

[0153] The black matrices 211 on both sides of the virtual axis 113 are also symmetrically distributed. Because the offsets between the color film substrate 21 and the array substrate 22 are the same at symmetrical positions about the virtual axis 113, the widths of the black matrices 211 are designed to be the same, which can effectively block light leakage and avoid color crosstalk.

[0154] In some embodiments of the present application, Fig.34 As shown, the width of the black matrix 211 located on both sides of the virtual axis 113 gradually increases in a direction away from the virtual axis 113 .

[0155] In this embodiment, the width of the black matrix 211 gradually increases as it moves away from the virtual axis 113 , and is symmetrically distributed about the virtual axis 113 .

[0156] Since the curvatures of the array substrate 22 and the color filter substrate 21 are different, and the radius of curvature of the color filter substrate 21 is greater than the radius of curvature of the array substrate 22, the length on the color filter substrate 21 is greater than the length on the array substrate 22 for the same curvature change. In the direction away from the virtual axis 113, the difference between the color filter substrate 21 and the array substrate 22 becomes larger and larger, so the width of the black matrix 211 is designed to gradually increase from close to the virtual axis 113 to away from the virtual axis 113, which can effectively block light leakage and avoid color crosstalk. In some embodiments of the present application, the display panel 2 includes an upper polarizer 23 and a lower polarizer 24, the upper polarizer 23 is arranged on the side of the display panel 2 away from the back plate 11, and the lower polarizer 24 is arranged on the side of the display panel 2 close to the back plate 11, and the upper polarizer 23 and the lower polarizer 24 include a polyvinyl alcohol film, and the thickness of the polyvinyl alcohol film is less than 20μm.

[0157] In this embodiment, when the display panel 2 is bent, since the display panel 2 itself is composed of two layers of glass, namely the first base substrate 131 and the second base substrate 131, the glass itself is subjected to its own stress, and light leakage will occur in the dark state of the curved display device. In particular, the dark state light leakage will be aggravated at the four corners of the module due to the squeezing force of the frame. And according to the formula Retar=SOC*t*Δσ, where Retar is the amount of glass retardation caused by stress, SOC is the glass photoelastic coefficient, t is the glass thickness, and Δσ is the internal stress of the glass, it can be seen that the dark state light leakage and Retar are correlated. The larger the Retar, the more serious the dark state light leakage will be. It is known that SOC is a fixed value by default. When the surface is bent, the thinner the glass, the smaller the internal stress, that is: the smaller t*Δσ, so generally speaking, for curved screen products, the thinner the glass thickness, the better.

[0158] The thickness of the polyvinyl alcohol film of the upper polarizer 23 and the lower polarizer 24 is reduced to less than 20 μm. When the display panel 2 is bent, the stress on the first base substrate 131 and the second base substrate 131 can be reduced, thereby reducing the dark state light leakage of the display panel 2 itself, so that the curved display device can maintain uniform brightness in the dark state, thereby improving the user experience of the curved display device.

[0159] The specific light leakage process can be combined Fig.31 and Fig.35 For explanation. Fig.35 As shown, when the display panel 2 is not bent, the incident light passes through the lower polarizer 24, the array substrate 22, the liquid crystal layer 26, the color filter substrate 21 and the upper polarizer 23 from bottom to top. Since the stress on the first substrate 131 and the second substrate 131 in the array substrate 22 and the color filter substrate 21 is small, isotropy is maintained, and no phase difference is generated during the light emission process, and the incident light direction is maintained. The light change trend is as shown in FIG. Fig.35When the display panel 2 is bent, the stress on the first substrate 131 and the second substrate 131 in the array substrate 22 and the color filter substrate 21 increases, and the isotropy changes to anisotropy. When the incident light passes through each layer in sequence, a phase difference is generated, resulting in dark state light leakage. The light change trend is shown in FIG. Fig.31 Shown on the right.

[0160] In order to better improve the dark state light leakage of the curved display device, the thickness of the second base substrate 131 and the first base substrate 131 of the array substrate 22 is set to 0.2 mm-0.3 mm, for example, 0.22 mm, 0.25 mm, 0.28 mm, 0.3 mm, etc. As the thickness of the first base substrate 131 and the second base substrate 131 is reduced, the internal stress generated during bending is smaller, which can effectively improve the dark state light leakage.

[0161] The third aspect of the present application provides a spliced ​​display device, which includes at least two of the above-mentioned curved display devices. The curved display devices used for splicing can have different sizes and different concave and convex forms. The spliced ​​display devices can display synchronously or separately, and the present application does not limit this.

[0162] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0163] Each embodiment in this specification is described in a related manner, and the same or similar parts between the embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0164] The above description is only a preferred embodiment of the present application and is not intended to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application are included in the protection scope of the present application.

Claims

1. A backlight module, characterized in that: include: A back plate, the back plate is bent at least once around a virtual axis parallel to the first direction, the back plate comprises a bottom wall and a side wall arranged around the bottom wall, the bottom wall and the side wall enclose a receiving space, the receiving space comprises a central area and a first sinking groove area located on one side of the central area, the first sinking groove area extends along the second direction and contacts the side wall; The light guide assembly is disposed in the accommodation space and does not contact the side wall; A light bar, disposed in the first sink area, comprising a substrate and a plurality of light-emitting elements disposed on the substrate; A plurality of supporting components are located in the first sinking groove area and are arranged at intervals along the long side direction for supporting the light guide component.

2. The backlight module according to claim 1, characterized in that: The support assembly includes a plurality of first support portions, each of which is arranged along the thickness direction, one end of which is supported on the bottom of the light guide assembly, and the other end of which is connected to the bottom wall; And / or, the supporting assembly includes a plurality of second supporting portions, which are arranged along the short side direction and are located below the light-emitting element, one end of which is connected to the substrate, and the other end of which extends to below the light guide assembly and supports the bottom of the light guide assembly.

3. The backlight module according to claim 2, characterized in that: The first supporting portion and the second supporting portion are integrally formed.

4. The backlight module according to claim 2, characterized in that: The support component also includes a limiting portion, which is arranged between the adjacent light-emitting elements, one end of which is connected to the substrate, and the other end of which is abutted against the end surface of the light guide component along the thickness direction. The limiting portion is integrally formed with the first support portion or the limiting portion is integrally formed with the second support portion.

5. The backlight module according to any one of claims 1 to 4, characterized in that: The side wall has a flange extending toward the center of the back plate, which is used to limit the base plate of the light bar.

6. The backlight module according to any one of claims 1 to 4, characterized in that: The back plate further comprises a second sinking groove area, a third sinking groove area and a fourth sinking groove area, wherein the second sinking groove area, the third sinking groove area, the fourth sinking groove area and the first sinking groove area are arranged around the central area, the second sinking groove area is arranged opposite to the first sinking groove area and is located on the other side of the central area, the third sinking groove area and the fourth sinking groove area extend along the short side direction and are arranged opposite to each other, and elastic supporting members are respectively arranged in the second sinking groove area, the third sinking groove area and the fourth sinking groove area; The light guide assembly includes a light guide plate, and the elastic abutting member abuts against the light guide plate.

7. A curved display device, characterized in that: The curved display device comprises a display panel and a backlight module according to any one of claims 1 to 6, wherein the backlight module is disposed below the display panel.

8. The curved display device according to claim 7, characterized in that: The curved display device comprises: at least one circuit board; At least one first chip-on-film package, the first chip-on-film package includes a first side and a second side parallel to each other and a third side and a fourth side connecting the first side and the second side, at least the first side and the second side are parallel to each other, at least one of the third side and the fourth side is a hypotenuse, the first side is electrically connected to a first position of the display panel, the second side is electrically connected to a second position of the circuit board, and the orthographic projections of the first position and the second position in the thickness direction at least partially do not overlap.

9. The curved display device according to claim 8, characterized in that: The third side and the fourth side are both hypotenuses.

10. The curved display device according to claim 9, characterized in that: The third side and the fourth side are parallel to each other.

11. The curved display device according to any one of claims 8 to 10, characterized in that: Each circuit board corresponds to an even number of the first chip-on-film packages, and the even number of the first chip-on-film packages are arranged in a mirror-symmetrical manner with respect to a central axis of the circuit board.

12. The curved display device according to claim 11, characterized in that: The curved display device also includes a second chip-on-film package, which is arranged between the first chip-on-film packages that are mirror-symmetrical to each other, and the shape of the second chip-on-film package is rectangular. One end of the second chip-on-film package is electrically connected to the display panel, and the other end is electrically connected to the circuit board.

13. The curved display device according to claim 11, characterized in that: A first angle between the first side and the third side is an acute angle, and a second angle between the first side and the fourth side is an obtuse angle; The curved display device is a convex product, and the fourth sides of the first flip chip packages that are mirror-symmetrical to each other are closer; The curved display device is a concave product, and the distance between the third sides of the first flip chip packages that are mirror-symmetrical to each other is closer.

14. The curved display device according to claim 13, characterized in that: When the curvature radius of the curved display device is less than or equal to 1500 mm, the second angle is greater than or equal to 120°; When the curvature radius of the curved display device is greater than or equal to 1500 mm, the second angle is greater than or equal to 100°.

15. The curved display device according to any one of claims 8 to 10, characterized in that: The circuit board includes at least a first sub-board and a second sub-board, the first sub-board and the second sub-board are electrically connected through a flexible circuit board, the first sub-board is electrically connected to the display panel through at least one of the first chip-on-film packages, and the second sub-board is electrically connected to the display panel through at least one of the first chip-on-film packages.

16. The curved display device according to claim 15, characterized in that: The flexible circuit board includes a first section, a middle section and a second section connected in sequence, the first section is electrically connected to the first sub-board, the second section is electrically connected to the second sub-board, and the angle between the first section and the middle section and the angle between the second section and the middle section are greater than or equal to 90°.

17. The curved display device according to claim 7, characterized in that: The display panel comprises: A color filter substrate, the color filter substrate comprising a first base substrate, a black matrix provided on the first base substrate, and a filter film of at least one color; An array substrate is arranged in a box with the color filter substrate; The curvature of the curved display device is denoted as X, the width of the black matrix is ​​denoted as Z, and the width of the black matrix and the curvature of the curved display device have the following relationship: Z=2(aX 3 +bX 2 -cX+72.5), where a ranges from -8E-09 to -6E-09, b ranges from 2E-05 to 4E-05, and c ranges from 0.0600 to 0.0800.

18. The curved display device according to claim 17, characterized in that: The array substrate includes a pixel electrode, the offset between the pixel electrode and a color filter film is Y, and the black matrix width Z and the offset Y have the following relationship: Z=2Y.

19. The curved display device according to claim 17, characterized in that: The width of the black matrix is ​​5 μm-35 μm.

20. The curved display device according to claim 17, characterized in that: The curved display device is bent around the virtual axis, and the black matrices located on both sides of the virtual axis gradually increase in width in a direction away from the virtual axis.

21. The curved display device according to claim 20, characterized in that: The widths of the black matrices at positions parallel to the virtual axis and at equal distances from the virtual axis are equal.

22. The curved display device according to claim 17, characterized in that: The display panel includes an upper polarizer and a lower polarizer, the upper polarizer is arranged on a side of the display panel away from the back plate, and the lower polarizer is arranged on a side of the display panel close to the back plate, the upper polarizer and the lower polarizer include polyvinyl alcohol films, and the thickness of the polyvinyl alcohol films is less than 20μm.

23. The curved display device according to claim 17, characterized in that: The array substrate includes a second base substrate, and the thickness of the first base substrate and the second base substrate is 0.2 mm-0.3 mm.

24. A splicing display device, characterized in that: The spliced ​​display device comprises at least two curved display devices according to any one of claims 7-23.

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