Backlight module, display panel and manufacturing method of backlight module

Abstract

The invention relates to the technical field of display, particularly provides a backlight module, a display panel and a manufacturing method of the backlight module, and aims to solve the problem of how to improve the light emitting quality of the display module. In order to achieve the purpose, the backlight module comprises a first substrate and a second substrate, the second substrate comprises a groove opposite to the light-emitting area; the first filler is arranged in the groove and is used for converting the light in the first wavelength range emitted by the light-emitting element into light in a second wavelength range; the light guide structure extends to the position above the groove to form an eave structure, and a gap is formed between the eave structure and the first filler; the first reflecting layer is arranged in the groove; the second filler is used for packaging the first filler; and a glue filling channel by means of which the gap is filled with the second filler. The gap is filled with the glue filling channel, so that the light emitting quality can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, and specifically provides a backlight module, a display panel and a manufacturing method of the backlight module. BACKGROUND

[0002] For the backlight source of the liquid crystal display module, in the process, when the color conversion material is filled into the groove of the light guide plate, due to the existence of the surface tension of the color conversion material itself, a gap is formed between the eave structure and the light guide plate, which will cause problems in the later baking, film plating and other processes. For example, in the baking process, due to the existence of the gap, the film layer may be peeled off, affecting the yield of the final product. In addition, the existence of the gap will also cause refraction when the light propagates in different media, thereby affecting the light extraction process. SUMMARY

[0003] The present application aims to solve the above technical problems, that is, to solve the problem of how to improve the light extraction quality of the display module due to the gap formed between the eave structure of the backlight source and the light guide plate.

[0004] In a first aspect, the present application provides a backlight module, comprising:

[0005] a first substrate comprising a light emitting area provided with a light emitting element;

[0006] a second substrate oppositely arranged with the first substrate, the second substrate comprising a groove oppositely arranged with the light emitting area;

[0007] a first filler arranged in the groove, converting the light of a first wavelength range emitted by the light emitting element into light of a second wavelength range;

[0008] a light guiding structure arranged around the groove on the second substrate;

[0009] a first reflective layer arranged at a position of a bottom portion of the groove, the light guiding structure extending above the groove to form an eave structure, and a gap being formed between the eave structure and the first filler;

[0010] a second filler for encapsulating the first filler; and

[0011] a glue filling channel, by means of which the second filler fills the gap.

[0012] In one technical solution of the above backlight module, a surface of the first filler facing the first substrate is a concave surface, so that the glue filling channel is formed between the eave structure and the concave surface.

[0013] In one of the technical solutions of the backlight module, the second filler at least fills the groove.

[0014] In one of the technical solutions of the backlight module, the surface of the second filler facing the first substrate is convex, and the edge of the convex surface overlaps the roof structure.

[0015] In one of the technical solutions of the backlight module, the backlight module further comprises:

[0016] A liquid-repellent structure is arranged on the surface of the roof structure facing the first substrate, and the edge overlaps the liquid-repellent structure.

[0017] In one of the technical solutions of the backlight module, the surface of the first filler facing the first substrate is convex and abuts against the roof structure.

[0018] The backlight module further comprises a first opening formed in the roof structure, the first opening communicates with the gap and serves as the glue filling channel.

[0019] In one of the technical solutions of the backlight module, the backlight module further comprises a first blocking structure for blocking the first opening.

[0020] In one of the technical solutions of the backlight module, the first opening is arranged in multiple along the circumference of the roof structure layer.

[0021] In one of the technical solutions of the backlight module, the light guide structure comprises a dot structure and a second reflective layer stacked on the second substrate, and the light of at least part of the second wavelength range is reflected by the second reflective layer to the dot structure, so that the light is emitted from the dot structure in a direction away from the first substrate.

[0022] In one of the technical solutions of the backlight module, the surface of the first filler facing the first substrate is convex and abuts against the roof structure, and the backlight module further comprises:

[0023] A second opening formed in the second reflective layer and a liquid storage groove arranged in the second substrate opposite to the second opening, the second opening communicates with the gap through the liquid storage groove and serves as the glue filling channel;

[0024] The liquid storage groove is used for accommodating the second filler entering from the second opening.

[0025] In one of the technical solutions of the backlight module, the backlight module further comprises a second blocking structure for blocking the second opening.

[0026] In one of the technical solutions of the backlight module, the second opening is provided with a plurality of openings along the circumference of the second reflective layer.

[0027] In one of the technical solutions of the backlight module, the surface of the second filler towards the first substrate is a plane in the area encapsulating the first filler.

[0028] In one of the technical solutions of the backlight module, the surface of the second filler towards the first substrate is provided with a lens structure on the area encapsulating the first filler.

[0029] In one of the technical solutions of the backlight module, the backlight module further comprises:

[0030] A protruding portion is provided in the center area of the groove, and the protruding portion protrudes towards the first substrate, and the first reflective layer is provided near the protruding portion.

[0031] In one of the technical solutions of the backlight module, the first reflective layer is provided with a third opening.

[0032] In one of the technical solutions of the backlight module, the backlight module further comprises a metal trace provided on the surface of the light guide structure towards the first substrate, and the metal trace is used to supply power to the light emitting element.

[0033] In one of the technical solutions of the backlight module, the backlight module further comprises a third reflective layer covering the first substrate and the second substrate.

[0034] In one of the technical solutions of the backlight module, the material of the first filler is a fluorescent powder or a quantum dot material.

[0035] In a second aspect, the present application provides a display panel comprising the backlight module of any one of the first aspect.

[0036] In a third aspect, the present application provides a manufacturing method of a backlight module, comprising:

[0037] Oppositely arranging a first substrate structure and a second substrate structure;

[0038] Covering the first substrate structure and the second substrate structure with a reflective layer to form the backlight module;

[0039] The first substrate structure comprises a first substrate and a light emitting element provided on the first substrate.

[0040] The second substrate structure comprises:

[0041] A second substrate is disposed opposite to the first substrate, and the second substrate comprises a groove disposed opposite to the light emitting region;

[0042] A first filler is disposed in the groove and converts light of a first wavelength range emitted by the light emitting element into light of a second wavelength range;

[0043] A light guiding structure is disposed on the second substrate around the groove, and the light guiding structure extends above the groove to form a roof structure, and a gap is formed between the roof structure and the first filler;

[0044] A first reflective layer is disposed at a position of a bottom portion of the groove;

[0045] A second filler is used to encapsulate the first filler; and

[0046] A glue filling channel is used for filling the gap by the second filler.

[0047] As described above, the present application fills the gap between the roof structure and the second substrate by the glue filling channel during the filling of the second filler, so that the possibility of peeling off between the film structures is reduced during subsequent film coating, baking and other processes, thereby improving the processing yield of the backlight module and improving the light output quality. In addition, since the gap is filled with the second filler, the light propagates in the backlight module only through a solid medium, thereby avoiding the refraction phenomenon caused by the light propagating in different forms of medium. BRIEF DESCRIPTION OF DRAWINGS

[0048] The preferred embodiments of the present application will be described below with reference to the accompanying drawings, in which:

[0049] Figure 1 is a schematic diagram of a backlight module in the related art;

[0050] Figure 2 is a cross-sectional schematic diagram of a backlight module according to an embodiment of the present application;

[0051] Figure 3 is Figure 2 is a top view of the second substrate in

[0052] Figure 4 is based on Figure 2 is a schematic diagram of a backlight module during the filling of the first filler in the manufacturing process of the backlight module according to an embodiment of the present application;

[0053] Figure 5 is a cross-sectional schematic diagram of a backlight module according to an embodiment of the present application;

[0054] Figure 6 FIG. 1 is a schematic cross-sectional view of a backlight module according to an embodiment of the present application.

[0055] Reference Signs List

[0056] 1, first substrate; 11, light emitting region; 2, second substrate; 21, groove; 211, protrusion; 22, first filler; 23, light guiding structure; 231, dot structure; 232, second reflective layer; 233, second opening; 24, first reflective layer; 241, third opening; 25, roof structure; 251, first opening; 26, second filler; 27, liquid repellent structure; 28, liquid storage groove; 3, metal trace; 4, lens structure; 5, gap. DETAILED DESCRIPTION

[0057] The preferred embodiments of the present application will be described below with reference to the drawings. It should be understood by those skilled in the art that the embodiments are only used to explain the technical principles of the present application, and are not used to limit the protection scope of the present application. Those skilled in the art can make adjustments to them as needed in order to adapt to specific application occasions.

[0058] It should be noted that in the description of the present application, the terms indicating the direction or position relationship such as "upper", "lower", "left", "right", "inner", "outer" and the like are based on the direction or position relationship shown in the drawings, which is only for the convenience of description, and does not indicate or imply that the related devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the ordinal numbers "first", "second" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0059] In addition, it should also be noted that in the description of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting" should be understood broadly, for example, it can be fixed connection, or detachable connection or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the present application according to the specific circumstances.

[0060] In the embodiments of the present application, the same layer arrangement of two or more functional layers means that these same layer arranged functional layers can be formed by using the same material layer and the same preparation process (such as patterning, etc.), so that the preparation process of the display panel can be simplified.

[0061] Reference Figure 1 ​Fig. 1 is a schematic diagram of a backlight module in the related art, which has a light emitting area 110 on a first substrate 100, and a light guide plate 200 opposite to the first substrate 100, the light guide plate 200 has a groove 210, and the groove 210 has a color conversion material layer 220. The light emitted from the light emitting area 110 is converted to white light by the color conversion material layer 220, and then reflected to all directions by a reflection layer (shown by a dashed line) at the bottom of the groove 210, and scattered by a reflection layer 230 and a dot 231 below, so that the light emitted from the light guide plate 200 is uniformly emitted from the whole light guide plate 200 (i.e. the brightness of the light below the dot and the light below the groove is close to the same). However, during the manufacturing process of the backlight module, after the color conversion material layer 220 is filled into the groove 210, due to the surface tension of the color conversion material layer 220, the surface of the color conversion material layer 220 facing the first substrate 100 will form a convex surface, and a gap 240 will be formed between the convex surface and a roof structure 230 on the light guide plate 200. The existence of the gap 240 will cause the encapsulation glue to be unable to enter or fill the gap 240 during the encapsulation of the color conversion material layer 220 (since the roof structure 230 is made of metal material, the roof structure 230 has high liquid affinity, so that during the filling process of the glue, even if the glue enters the gap 240, the liquid surface will collapse and diffuse on the surface of the roof structure 230 due to the high liquid affinity of the roof structure 230, and it is difficult to fill the gap 240), which will affect the later encapsulation process of the backlight module. For example, the bubbles existing in the gap 240 will cause the film layers in the backlight module to peel off from each other during the later baking process, thereby affecting the processing yield of the backlight module.

[0062] In addition, due to the existence of the gap 240, part of the light emitted from the color conversion material layer 220 will enter the gap 240, and then enter other medium layers through the gap 240. Therefore, the light will be refracted twice during the process of passing through the gap 240, thereby affecting the transmission of the light in the backlight module. As described above, the existence of the gap 240 affects the overall structure of the backlight module, and therefore affects the light emitting quality of the backlight module.

[0063] Referring to Figure 2 and Figure 3 wherein Figure 2 Fig. 1 is a cross-sectional view of a backlight module according to an embodiment of the present application, Figure 3 Fig. 2 is a top view of the backlight module according to an embodiment of the present application. As shown in the figure, the backlight module comprises a first substrate 1 and a second substrate 2 opposite to the first substrate 1.

[0064] The first substrate 1 has a light emitting area 11, and the light emitting area 11 is provided with a light emitting element, which can be a structure such as an LED light strip.

[0065] The material of the second substrate 2 can be glass. The second substrate 2 is a carrier for mounting the devices, and has high strength and impact resistance. The surface of the second substrate 2 facing the light emitting region 11 is provided with a groove 21. The groove 21 is arranged opposite the light emitting region 11, so that the light emitted by the light emitting region 11 can enter the groove 21. As a possible implementation of the present application, the central region of the bottom of the groove 21 is provided with a protruding portion 211. The tip of the protruding portion 211 protrudes towards the first substrate 1.

[0066] The groove 21 is filled with a first filler 22. The material of the first filler 22 can be a fluorescent powder or a quantum dot material, etc. That is, the first filler 22 can be a quantum dot material mixed with red and green, or a fluorescent powder mixed with red and green. In actual filling, the solid material can be directly filled, or the material can be mixed into a glue material and then filled. The function of the first filler 22 is to convert the light of the first wavelength range emitted by the light emitting element into light of the second wavelength range. For example, in an embodiment of the present application, the light excited by the light emitting element is monochromatic light (such as red light and blue light). At this time, the first wavelength range refers to the wavelength of the monochromatic light, and the light of the second wavelength range converted by the first filler 22 is white light, that is, the wavelength range is large, so as to meet the light emission requirement. Alternatively, the first wavelength range is 430-490 nm, and the second wavelength range is 430-760 nm.

[0067] The surface of the second substrate 2 facing the first substrate 1 is provided with a light guiding structure 23 around the groove 21. Part of the bottom of the groove 21 is provided with a first reflecting layer 24 (shown by a dashed line). In the present application, the first reflecting layer 24 is arranged near the protruding portion 211. The first reflecting layer 24 is arranged to reflect at least part of the light of the second wavelength range to the light guiding structure 23, and then the light is emitted away from the first substrate 1 through the light guiding structure 23. In some implementations of the present application, the light of the second wavelength range can be partially reflected to the light guiding structure 23 through the first reflecting layer 24, and the other part of the light of the second wavelength range is directly emitted through the groove 21. For this purpose, a third opening 241 can be formed in the first reflecting layer 24, so that part of the light of the second wavelength range directly passes through the third opening 241 and the groove 21. Of course, the light of the second wavelength range can also be totally reflected to the light guiding structure 23 through the first reflecting layer 24, and then scattered by the light guiding structure 23, so that the light is emitted to the lower region of the groove 21.

[0068] In one embodiment of the present application, the cross section of the groove 21 is in the shape of a bowl or a cup, and the "bottom" of the groove 21 refers to the entire bottom surface of the groove 21, and the "part of the bottom of the groove 21 is provided with the first reflective layer 24" means that the first reflective layer 24 does not cover the entire bottom surface of the groove 21, but is arranged in the central region of the bottom surface of the groove 21 (i.e. the dashed portion in FIG. 2B), and the two side regions of the bottom surface of the groove 21 are not covered by the first reflective layer 24. In this way, the light emitted by the light emitting element can be reflected by the first reflective layer 24 to the two side regions of the bottom surface of the groove 21, and then enter the light guiding structure 23. Of course, when the third opening 241 is arranged on the first reflective layer 24, part of the light directly passes through the third opening 241 downward, and part of the light is reflected by the first reflective layer 24 and then enters the light guiding structure 23 through the two side regions of the bottom surface of the groove 21. Figure 2

[0069] The first reflective layer 24 can be made of a metal material, such as Ag or AL, and can be formed by a sputtering or evaporation process, or can be made of a resin material containing high-concentration scattering particles. In actual applications, the material of the first reflective layer 24 can be selected according to actual needs, and the present application does not limit the material of the first reflective layer 24.

[0070] It should be noted that although the above-mentioned embodiment of the present application is exemplarily described by arranging the protruding portion 211 on the bottom of the groove 21, this does not constitute a limitation on the present application. For example, in some other embodiments, the first reflective layer 24 can also be arranged in the form of a central protruding structure, and the same effect can also be achieved.

[0071] In yet another embodiment, the bottom of the groove 21 can be arranged without the protruding portion 211, and the first reflective layer 24 is also not in the form of a protruding structure, i.e. the central region of the bottom surface of the groove 21 and the first reflective layer 24 are both smooth transition surfaces.

[0072] The light guiding structure 23 is arranged to reflect the light reflected by the first reflective layer 24 in a direction away from the first substrate 1, and the "direction away from the first substrate 1" not only refers to the direction perpendicular to the first substrate 1, but also includes a direction at an angle relative to the first substrate 1, so as to enhance the uniformity of the distribution of the light in the second substrate 2.

[0073] ​To this end, in a possible implementation of the present application, the light guiding structure 23 comprises a dot structure 231 and a second reflective layer 232 which are arranged in layers on the second substrate 2. The second reflective layer 232 can be a metal layer with a thickness of 100nm-300nm, and the metal material can be Ag or AL or other high reflectivity material. The dot structure 231 can be made of resin material, and can be in the form of an array of lenses. In this way, the light of the second wavelength range is reflected by the first reflective layer 24 to the second reflective layer 232, and then reflected by the second reflective layer 232 to the dot structure 231, and finally exits through the dot structure 231. Therefore, based on the structure of the dot structure 231, the light can be scattered downward after passing through the dot structure 231, thereby increasing the uniformity of the light.

[0074] The second reflective layer 232 and the dot structure 231 are arranged around the groove 21, and the inner edge of the second reflective layer 232 extends towards the top of the groove 21 to form a roof structure 25.

[0075] The roof structure 25 is formed by laterally hollowing out the second substrate 2 adjacent to the light guiding structure 23 when etching the groove on the position of the second substrate 2 where the groove is to be formed after forming a patterned material layer (such as Ag or Mo metal material) above the position. Therefore, after the first filler 22 is filled into the groove 21, a gap is formed between the roof structure 25 and the first filler 22. In actual processing, the roof structure 25 and the second reflective layer 232 can be the same material or different materials. When the roof structure 25 and the second reflective layer 232 are the same material, they can be arranged in the same layer.

[0076] When the second filler 26 is filled to encapsulate the first filler 22, in order to enable the glue to be filled into the gap, in an implementation, the surface of the first filler 22 towards the first substrate 1 is concave (at this time, refer to Figure 4 , a gap 5 is formed between the roof structure 25 and the first filler 22), so that a glue filling channel (i.e. the area above the concave surface close to the center of the groove 21) is formed between the light emitting area 11 and the concave surface. The glue enters the gap 5 between the roof structure 25 and the concave surface through the glue filling channel, and fills the gap 5.

[0077] The second filler 26 can be made of acrylic resin, epoxy resin or other materials.

[0078] Specifically, the second filler 26 is arranged to at least fill the groove 21 to ensure the sealing of the overall structure of the backlight module. In an embodiment of the present application, the second filler 26 is arranged to protrude from the roof structure 25, i.e. the surface of the second filler 26 towards the first substrate 1 is convex, and the edge of the convex surface overlaps the roof structure 25.

[0079] Further, the roof structure 25 is also provided with a liquid-repellent structure 27 towards the surface of the first substrate 1, and the convex surface of the second filler 26 is overlapped on the liquid-repellent structure 27. The liquid-repellent structure 27 can be a fluorine-containing resin material, which can be an epoxy resin or an acrylic resin. The liquid-repellent structure 27 has the following effects: on the one hand, it prevents the second filler 26 from spreading along the roof structure 25 to the metal wire 3 during the filling of the second filler 26, so as to ensure that the metal wire 3 is not affected by the second filler 26; on the other hand, the liquid-repellent structure 27 is also used to make the second filler 26 form a convex surface.

[0080] In one embodiment, the second reflective layer 232 is provided with a metal wire 3 towards the surface of the first substrate 1, and the metal wire 3 is electrically connected to the light-emitting element, for supplying power to the light-emitting element.

[0081] Referring to Figure 5 FIG. 6 is a cross-sectional view of a backlight module according to an embodiment of the present application, which shows a second embodiment of the glue filling channel, and FIG. 7 is a cross-sectional view of a backlight module according to an embodiment of the present application, which shows a third embodiment of the glue filling channel. Figure 2 The difference between the embodiments shown in FIGS. 6 and 7 and the embodiment shown in FIG. 5 is that the first filler 22 is convex towards the surface of the first substrate 1, and the convex surface is in abutment with the roof structure 25, and an air gap is also formed between the convex surface and the roof structure 25. In this case, the glue filling channel is a first opening 251 formed on the roof structure 25, and the first opening 251 is in communication with the air gap, so that during the filling of the second filler 26, glue can be injected into the air gap through the first opening 251 to fill the air gap.

[0082] Optionally, a plurality of first openings 251 are arranged along the circumference of the roof structure 25, so that by increasing the number of the first openings 251, the injection speed of the glue can be increased, and the glue filling in the air gap can be more uniform, and the possibility of air bubbles in the air gap can be reduced.

[0083] Optionally, the first opening 251 is also plugged with a first plugging structure, and the material of the first plugging structure can be an epoxy resin or an acrylic resin. After the injection through the first opening 251 is completed, the opening end of the first opening 251 can be filled with an epoxy resin or an acrylic resin to form the first plugging structure, so as to ensure that the second filler 26 is stably filled in the air gap.

[0084] Referring to Figure 6 FIG. 8 is a cross-sectional view of a backlight module according to an embodiment of the present application, which shows a third embodiment of the glue filling channel, and similarly, the first filler 22 is convex towards the surface of the first substrate 1, and the convex surface is in abutment with the roof structure 25, and the difference between the embodiments shown in FIGS. 6 and 7 and the embodiment shown in FIG. 5 is that Figure 4The difference between the shown embodiment and the second embodiment is that the second opening 233 is formed on the second reflective layer 232, and the liquid storage groove 28 is formed on the second substrate 2 opposite to the second opening 233, and the second opening 233, the liquid storage groove 28 and the gap are sequentially communicated to form the glue filling channel. During the filling of the second filler 26, the glue liquid can enter the liquid storage groove 28 through the second opening 233, and then fill the gap.

[0085] Similarly, the second opening 233 can also be provided with multiple along the circumference of the second reflective layer 232, and the second sealing structure is formed at the opening end of the second opening 233. The above setting and the structure and the role of the second embodiment are the same, and this application will not be repeated here.

[0086] It should be noted that the difference between the third embodiment and the second embodiment is that the third embodiment opens the second opening 233 on the second reflective layer 232, which is relatively low in difficulty compared with the opening on the eaves structure 25 in the second embodiment, and can ensure the integrity of the eaves structure 25, but after forming the second opening 233, the liquid storage groove 28 needs to be etched on the second substrate 2 through the second opening 233 to make the second opening 233 and the gap communicate, and the second embodiment does not need this process step. Therefore, the second embodiment and the third embodiment have their own advantages, and in actual application, it can be selected according to actual needs.

[0087] As above, by setting the glue filling channel in the backlight module, the glue liquid can fill the gap between the eaves structure 25 and the second substrate 2 through the glue filling channel during the filling of the second filler 26, so that in the subsequent film coating, baking and other processes, the possibility of peeling off between each film structure is reduced, thereby improving the processing yield of the backlight module and improving the light output quality. In addition, since the gap is filled with the second filler 26, the light propagates in the backlight module only through the solid medium, thereby avoiding the refraction phenomenon caused by the light propagating in different forms of medium.

[0088] Referring to Figure 4 and Figure 5 In some implementations, the surface of the second filler 26 towards the first substrate 1 is planar in the area corresponding to the first filler 22, based on which a lens structure 4 can also be provided on the plane, and the lens structure 4 can be formed with multiple on the plane array, and the lens structure 4 can condense the light emitted by the light emitting area 11, thereby enhancing the brightness of the light entering the groove 21.

[0089] Further, the first substrate 1 is further provided with a third reflective layer, the third reflective layer covers the first substrate 1 and the second substrate 2, the third reflective layer can re-reflect the light in the area of the first substrate 1 into the groove 21, so as to fully utilize the light and further enhance the light brightness in the groove 21.

[0090] The application further discloses a manufacturing method of the backlight module, which comprises the following steps:

[0091] S101: oppositely arranging the first substrate structure and the second substrate structure.

[0092] The first substrate structure comprises but is not limited to the first substrate 1, the light emitting element and the like in the backlight module, and further comprises other necessary functional components arranged on the first substrate 1. The second substrate structure comprises but is not limited to the second substrate 2 and a series of functional components arranged on the second substrate 2, such as the groove, the color conversion layer, the light guiding structure and the like.

[0093] S102: covering the first substrate structure and the second substrate structure with the reflective layer to encapsulate and form the backlight module.

[0094] The following takes the first embodiment in the backlight module as an example to exemplarily illustrate the manufacturing steps of the second substrate structure:

[0095] Firstly, the second substrate 2 is provided, and the patterned light guiding structure 23 is formed on the second substrate 2 to expose the middle area of the surface of the surrounded second substrate 2. For example, the patterned process can comprise the formation, exposure, development and etching of photoresist and the like.

[0096] Next, the groove 21 is formed at the surface of the surrounded second substrate 2, wherein the groove 21 can be formed by using the etching process. The surface of the second substrate 2 in the central area is exposed by patterning the light guiding structure 23, and then the second substrate 2 is etched by using the etching liquid to form the groove 21. In the process of etching the second substrate 2 by the etching liquid, the etching liquid forms a side notch in the lower area of the light guiding structure 23, thereby forming the eave structure 25 extending upwards from the groove 21.

[0097] Next, the first reflective layer 24 is formed on the groove 21 by using the sputtering or evaporation method.

[0098] Then, the first filler 22 is formed in the groove 21, the first filler 22 forms a concave surface towards the surface of the first substrate 1, and the gap is formed between the first filler 22 and the eave structure 25. In this way, the glue filling channel for the glue liquid is formed between the light emitting area 11 and the first filler 22.

[0099] Finally, the glue is injected into the groove 21, and the glue fills the gap through the glue filling channel to form the second filler 26. In the process of forming the second filler 26, the second substrate structure after the glue injection can be placed into a vacuum decompression chamber, and the air bubbles in the gap are overflowed under the action of air pressure, so that the second filler 26 fills the gap better.

[0100] For the second embodiment of the backlight module, the first filler 22 is formed into a convex surface towards the surface of the first substrate 1 in the process of filling the first filler 22. Before filling the second filler 26, the first opening 251 is formed on the roof structure 25, and then the glue is injected into the gap through the first opening 251 in the process of filling the second filler 26 to fill the gap.

[0101] For the third embodiment of the backlight module, the liquid storage groove 28 is formed in the second substrate 2 before filling the second filler 26, and the second opening 233 is formed on the second reflecting layer 232. Finally, the glue is injected into the liquid storage groove 28 through the second opening 233 in the process of filling the second filler 26, and the glue enters the gap through the liquid storage groove 28 to fill the gap.

[0102] The application also discloses a display panel comprising the backlight module in any of the above embodiments and components such as a liquid crystal module, a glass cover plate and the like. The relative relationship between the liquid crystal module, the glass cover plate and the like and the backlight module is a known technology in the art, and thus is not described herein.

[0103] The technical scheme of the application has been described in combination with the preferred embodiments shown in the drawings, but it is easy for those skilled in the art to understand that the protection scope of the application is obviously not limited to these specific embodiments. Those skilled in the art can make equivalent changes or replacements to the related technical features without departing from the principles of the application, and the technical scheme after the changes or replacements will fall within the protection scope of the application.

Claims

1. A backlight module, characterized in that: include: A first substrate including a light-emitting area provided with a light-emitting element; a second substrate disposed opposite to the first substrate, the second substrate comprising a groove disposed opposite to the light-emitting area; a first filler, disposed in the groove, for converting light within a first wavelength range emitted by the light-emitting element into light within a second wavelength range; a light guiding structure provided on the second substrate around the groove, the light guiding structure extending above the groove to form an eaves structure, and a gap being formed between the eaves structure and the first filler; a first reflective layer disposed at a portion of the bottom of the groove; a second filler, used to encapsulate the first filler; as well as The glue fills the channel, and the second filler fills the gap with the help of the glue filling the channel.

2. The backlight module according to claim 1, wherein: The surface of the first filler facing the first substrate is a concave surface, so that the glue filling channel is formed between the eaves structure and the concave surface.

3. The backlight module according to claim 2, wherein: The second filler at least fills the groove.

4. The backlight module according to claim 3, wherein: The surface of the second filler facing the first substrate is a convex surface, and the edge of the convex surface overlaps the eaves structure.

5. The backlight module according to claim 4, wherein: The backlight module further includes: The liquid-repellent structure is arranged on the surface of the eaves structure facing the first substrate, and the edge is overlapped on the liquid-repellent structure.

6. The backlight module according to claim 1, wherein: The surface of the first filler facing the first substrate is a convex surface, which abuts against the eaves structure; The backlight module further includes a first opening formed in the eaves structure, wherein the first opening is connected to the gap and serves as the glue filling channel.

7. The backlight module according to claim 6, wherein: The backlight module further includes a first blocking structure for blocking the first opening.

8. The backlight module according to claim 6, wherein: A plurality of first openings are provided along the circumference of the eaves structure layer.

9. The backlight module according to claim 1, wherein: The light guiding structure includes a grid dot structure and a second reflective layer stacked on the second substrate. At least part of the light in the second wavelength range is reflected by the second reflective layer to the grid dot structure, so that the light is emitted from the grid dot structure in a direction away from the first substrate.

10. The backlight module according to claim 9, wherein: The surface of the first filler facing the first substrate is convex and abuts against the eaves structure. The backlight module further includes: a second opening formed in the second reflective layer, and a liquid reservoir disposed in the second substrate opposite to the second opening, wherein the second opening is connected to the gap through the liquid reservoir to serve as the glue filling channel; The liquid storage tank is used to accommodate the second filler entering from the second opening.

11. The backlight module according to claim 10, wherein: The backlight module further includes a second blocking structure for blocking the second opening.

12. The backlight module according to claim 10, wherein: A plurality of second openings are arranged along the circumference of the second reflective layer.

13. The backlight module according to any one of claims 6-8 and 10-12, characterized in that: A surface of the second filler facing the first substrate is a plane in a region where the first filler is encapsulated.

14. The backlight module according to claim 13, wherein: A lens structure is provided on a surface of the second filler facing the first substrate in an area encapsulating the first filler.

15. The backlight module according to claim 1, wherein: The backlight module further includes: The protrusion is arranged in the central area of ​​the groove and protrudes toward the first substrate. The first reflective layer is arranged at a position close to the protrusion.

16. The backlight module according to claim 15, wherein: A third opening is provided on the first reflective layer.

17. The backlight module according to claim 1, wherein: The backlight module further includes a metal trace disposed on a surface of the light guiding structure facing the first substrate, and the metal trace is used to supply power to the light emitting element.

18. The backlight module according to claim 1, wherein: The backlight module further includes a third reflective layer covering the first substrate and the second substrate.

19. The backlight module according to claim 1, wherein: The material of the first filler is phosphor or quantum dot material.

20. A display panel comprising the backlight module according to any one of claims 1 to 19.

21. A method for manufacturing a backlight module, characterized in that: include: Arrange the first substrate structure and the second substrate structure opposite to each other; using a reflective layer to cover the first substrate structure and the second substrate structure to form the backlight module; Wherein, the first substrate structure includes a first substrate and a light-emitting element arranged on the first substrate; The second substrate structure includes: a second substrate disposed opposite to the first substrate, the second substrate comprising a groove disposed opposite to the light-emitting area; a first filler, disposed in the groove, for converting light within a first wavelength range emitted by the light-emitting element into light within a second wavelength range; a light guiding structure provided on the second substrate around the groove; a first reflective layer disposed at a portion of the bottom of the groove, wherein the light guiding structure extends above the groove to form an eaves structure, and a gap is formed between the eaves structure and the first filler; a second filler, used to encapsulate the first filler; and The glue fills the channel, and the second filler fills the gap with the help of the glue filling the channel.

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