Backlight module and display device

Abstract

The utility model provides a backlight module and a display device, and relates to the technical field of display, the backlight module comprises a back plate, a light guide plate, an optical film, a light bar and a rubber frame; the optical film and the light guide plate are sequentially stacked on one side of the back plate in the first direction, the light bar and the edge side of the light guide plate are oppositely arranged, the light bar comprises a circuit board and a light-emitting unit, light emitted by the light-emitting unit can be projected on the display panel after the direction of the light is changed through the light guide plate, and the rubber frame is fixedly connected to the back plate and surrounds the periphery of the light guide plate. A protrusion is arranged on an extension plate of the rubber frame and located between the light bar and the light guide plate. The display device comprises the backlight module and a display panel. The display panel is stacked on the side, away from the light guide plate, of the optical film in the first direction and connected to the extension plate. The protrusions are arranged to block the expanded light guide plate, and the light guide plate can be prevented from making contact with and extruding the light emitting unit.

Description

Technical Field

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

[0002] The backlight module is one of the key components of the display, and is mainly responsible for providing sufficient and evenly distributed light sources for the display panel so that it can display images normally. The backlight module can be divided into direct-type backlight modules and edge-type backlight modules according to different light entry methods; for edge-type backlight modules, the light-emitting unit is usually set on the side of the light guide plate, and the light emitted by the light-emitting unit is evenly guided to the display panel through the light guide plate; and because the light-emitting unit is located on the side of the light guide plate, the edge-type backlight module can be thinner and lighter, and the display effect is more uniform.

[0003] However, when the edge-entry backlight module is in use, the light guide plate will expand when it is in a high temperature or high humidity environment, so that the side of the light guide plate contacts and squeezes the light unit, causing damage to the light unit and affecting the light entry effect.

[0004] Therefore, how to prevent the expanded light guide plate from contacting and squeezing the light-emitting unit is a technical problem that needs to be solved urgently in display technology. Utility Model Content

[0005] In view of this, the purpose of the present disclosure is to provide a backlight module and a display device, which are used to solve the technical problem existing in the prior art of how to prevent the expanded light guide plate from contacting and squeezing the light-emitting unit.

[0006] In order to achieve at least one of the above purposes, the present disclosure provides the following technical solutions:

[0007] In a first aspect, a backlight module is provided, comprising:

[0008] Back panel;

[0009] A light guide plate, the light guide plate is stacked on one side of the back plate along a first direction, and a light incident surface is arranged on the outer peripheral side of the light guide plate;

[0010] An optical film, the optical film is stacked along a first direction and arranged on a side of the light guide plate away from the back plate;

[0011] Light bar, light bar includes:

[0012] A circuit board, the circuit board and the light incident surface are arranged opposite to each other along a second direction;

[0013] A light-emitting unit, the light-emitting unit is electrically connected to the circuit board, and the light-emitting unit is arranged on a side of the circuit board facing the light incident surface;

[0014] The light-emitting unit is configured to emit light toward the light-incident surface, and the light is redirected by the light guide plate and provided to the display panel through the optical film sheet;

[0015] A rubber frame, which is fixedly connected to the backplane and surrounds the outer periphery of the light guide plate;

[0016] The rubber frame has an extension plate extending in the second direction, and a protrusion is provided on the side of the extension plate facing the backplane;

[0017] Wherein, the protrusion is disposed between the circuit board and the light-incident surface;

[0018] The orthographic projection of the protrusion on the plane where the light-incident surface is located does not coincide with the orthographic projection of the light-emitting unit on the plane where the light-incident surface is located;

[0019] The surface of the protrusion facing the light-incident surface is a blocking surface, and the surface of the light-emitting unit facing the light-incident surface is a light-emitting surface;

[0020] In the second direction, the maximum distance between the blocking surface and the light-incident surface is less than the minimum distance between the light-emitting surface and the light-incident surface.

[0021] In the above technical solution, a protrusion is provided on the extension plate of the rubber frame. The protrusion is located between the circuit board and the light-incident surface of the light guide plate, and the blocking surface of the protrusion is closer to the light-incident surface of the light guide plate than the light-emitting surface of the light-emitting unit. After the light guide plate expands, its light-incident surface will first contact the protrusion, and the protrusion can block the light-incident surface of the light guide plate from continuing to move toward the light-emitting unit and squeezing the light-emitting unit, so as to avoid the expanded light guide plate from damaging the light-emitting unit; moreover, the protrusion is connected to the rubber frame through the extension plate, and the rubber frame is fixedly connected to the backplane, so that the rubber frame and the backplane can bear the extrusion force from the expanded light guide plate together with the protrusion, which can increase the structural strength of the protrusion and improve the blocking effect; in addition, the orthographic projections of the protrusion and the light-emitting unit on the plane where the light-incident surface is located do not coincide, so that the protrusion can be disposed outside the path of the light emitted by the light-emitting unit toward the light-incident surface, avoiding the protrusion from blocking the light from entering the light guide plate or reducing the blocking effect of the protrusion on the light.

[0022] In some embodiments, in the second direction, there is a first gap between the protrusion and the circuit board;

[0023] Wherein, the first gap is the minimum distance between the side of the protrusion facing away from the light-incident surface and the side of the circuit board facing the light-incident surface.

[0024] In the above technical solution, after the light guide plate expands, it will apply an extrusion force to the protrusion. By providing a first gap between the protrusion and the circuit board, it is possible to prevent the extrusion force received by the protrusion from being transmitted to the circuit board, and the first gap can also accommodate the deformation of the protrusion under the action of the extrusion force and ensure that the protrusion does not contact the circuit board, so as to avoid the circuit board from deforming due to the extrusion force of the light guide plate and affecting the light-incident effect of the light bar.

[0025] In some embodiments, in the second direction, there is a second gap between the protrusion and the light guide plate;

[0026] Wherein, the second gap is the minimum distance between the blocking surface and the light incident surface.

[0027] In the above technical solution, by providing a second gap between the protrusion and the light guide plate, the light guide plate can freely expand before touching the protrusion, that is, the second gap allows the light guide plate to have a reasonable expansion range; moreover, the protrusion blocks the continuous expansion of the light guide plate only when the light guide plate expands to a certain range, which can relatively reduce the time for structures such as the protrusion and the rubber frame to bear the extrusion force, and prolong the service life of structures such as the protrusion and the rubber frame; in addition, the existence of the second gap can make the size of the protrusion smaller in the second direction, which can further reduce the influence of the protrusion on the light (the light is the light emitted by the light-emitting unit towards the light incident surface).

[0028] In some embodiments, the protrusion and the extension plate are integrally formed; or,

[0029] The protrusion, the extension plate and the rubber frame are integrally formed.

[0030] In the above technical solution, by integrally forming the protrusion and the extension plate or integrally forming the two with the rubber frame, the connection strength between the protrusion and the extension plate and the rubber frame can be enhanced, and the integrally formed structure will also make the structure strength of the protrusion greater, improving the resistance of the protrusion to the expanded light guide plate, so that the protrusion will not easily fall off after being extruded by the light guide plate; moreover, the method of integrally forming the protrusion, the extension plate and the rubber frame can be integrally injection molded, which has a simple process and can relatively reduce the cost; in addition, by integrally forming the protrusion, the extension plate and the rubber frame, there is no need for assembly between the three, which helps to improve the assembly efficiency of the entire module.

[0031] In some embodiments, a reinforcing rib is provided between the protrusion and the extension plate;

[0032] Wherein, the reinforcing rib is connected between the side of the protrusion facing away from the light incident surface and the side of the extension plate facing the back plate.

[0033] In the above technical solution, by providing a reinforcing rib between the protrusion and the extension plate, the connection reliability between the protrusion and the extension plate can be enhanced; moreover, by arranging the reinforcing rib on the side of the protrusion facing away from the light incident surface, the protrusion can have a stronger ability to resist deformation.

[0034] In some embodiments, the blocking surface is a plane.

[0035] In the above technical solution, the light guide plate can contact the blocking surface of the protrusion after expansion. The blocking surface is designed to be a plane, so that the extrusion force applied by the light guide plate on the protrusion can be more evenly distributed on the protrusion, so that the protrusion is evenly stressed and not easy to bend.

[0036] In some embodiments, there are multiple protrusions, and the multiple protrusions are arranged on the extension plate at intervals along the third direction;

[0037] The third direction is perpendicular to a plane formed by the first direction and the second direction.

[0038] In the above technical solution, multiple protrusions are arranged on the extension plate, and the multiple protrusions can jointly block the light incident surface of the expanded light guide plate, which can effectively prevent the light incident surface of the light guide plate from continuing to move toward the light-emitting unit and squeeze the light-emitting unit, so as to avoid the expanded light guide plate damaging the light-emitting unit.

[0039] In some embodiments, there are multiple light-emitting units, and the multiple light-emitting units are arranged on the circuit board at intervals along the third direction;

[0040] The third direction is perpendicular to a plane formed by the first direction and the second direction.

[0041] In the above technical solution, multiple light-emitting units are arranged on the circuit board, and the multiple light-emitting units can simultaneously emit light to the light incident surface of the light guide plate. The light guide plate can convert these line light sources into surface light sources to form a backlight light source with better uniformity to enhance the display effect of the product.

[0042] In some embodiments, the surface of the extension plate facing the back plate is a limiting surface, and a portion of the limiting surface abuts against an edge of the optical film facing away from the light guide plate.

[0043] In the above technical solution, the limiting surface of the extension plate is abutted against the edge of the optical film, and in combination with the back plate, the stacked optical film and the light guide plate can be limited between the extension plate and the back plate, which can enhance the structural stability.

[0044] In a second aspect, a display device is provided, comprising a display panel and a backlight module according to any one of the first aspects;

[0045] The display panel is stacked along the first direction on a side of the optical film away from the light guide plate, and the display panel is connected to a side of the extension plate away from the back plate.

[0046] In the above technical solution, the display device includes the backlight module in the first aspect, and the display device can achieve the same technical effect as the backlight module; in addition, the display panel is connected to the extension plate, and the extension plate has a bearing function for the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] To more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present disclosure. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0048] Figure 1 Schematic three-dimensional structure diagram of a display device provided according to some embodiments of the present disclosure;

[0049] Figure 2 Schematic front view structure diagram of a display device provided according to some embodiments of the present disclosure;

[0050] Figure 3 Schematic bottom view structure diagram of a display device provided according to some embodiments of the present disclosure;

[0051] Figure 4 is Figure 3 Schematic enlarged structure diagram of the partial area A in;

[0052] Figure 5 Schematic structure diagram of an arrangement mode between a protrusion and a light-emitting unit provided according to some embodiments of the present disclosure;

[0053] Figure 6 Schematic partial three-dimensional structure diagram of an assembled glue frame and a light guide plate provided according to some embodiments of the present disclosure;

[0054] Figure 7 Schematic three-dimensional structure diagram of a glue frame at an angle provided according to some embodiments of the present disclosure;

[0055] Figure 8 Schematic three-dimensional structure diagram of a glue frame at another angle provided according to some embodiments of the present disclosure;

[0056] Figure 9 Schematic structure diagram of a reinforcing rib provided between a protrusion and an extension plate according to some embodiments of the present disclosure;

[0057] Figure 10 Schematic three-dimensional structure diagram of a lamp bar installed on a heat dissipation rack provided according to some embodiments of the present disclosure.

[0058] The reference numerals are as follows:

[0059] 1 - Backplane;

[0060] 2 - Light guide plate, 21 - Light incident surface;

[0061] 3 - Optical film;

[0062] 4 - Reflector;

[0063] 5 - light bar, 51 - circuit board, 52 - light emitting unit, 521 - light emitting surface;

[0064] 6 - heat dissipation frame;

[0065] 7 - rubber frame, 71 - extension plate, 711 - limiting surface, 72 - protrusion, 721 - blocking surface, 73 - reinforcing rib;

[0066] 8 - display panel;

[0067] a - first gap;

[0068] b - second gap. Detailed implementation mode

[0069] The present disclosure will be further described in detail below with reference to the accompanying drawings and embodiments. Through these descriptions, the features and advantages of the present disclosure will become more clearly defined.

[0070] Unless otherwise defined, all technical and scientific terms used in the present disclosure have the same meaning as commonly understood by those skilled in the technical field to which the present disclosure belongs; the terms used in the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure; the terms "including" and "having" and any variations thereof in the specification and the above - mentioned drawings of the present disclosure are intended to cover non - exclusive inclusion.

[0071] The "embodiment" mentioned in the present disclosure means that the specific features, structures or characteristics described in connection with the embodiment can be included in at least one embodiment of the present disclosure. The appearance of this phrase at various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described in the present disclosure can be combined with other embodiments.

[0072] The special term "exemplary" mentioned in the present disclosure means "serving as an example, an embodiment or an illustration". Among them, any embodiment described as "exemplary" does not have to be interpreted as superior to or better than other embodiments. Although various aspects of the embodiment are shown in the drawings, unless otherwise specified, the drawings do not have to be drawn to scale.

[0073] In the description of the present disclosure, the technical terms "first", "second", "third", etc. are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary - secondary relationship of the indicated technical features.

[0074] In the description of the present disclosure, the technical term "and / or" is merely a relational description of associated objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, in this text, the character " / " generally indicates an "or" relationship between the associated objects before and after.

[0075] In the description of the present disclosure, the orientation or positional relationships indicated by technical terms such as "upper", "lower", "inner", "outer", "front", "rear", "left", "right", "top", "bottom", etc. are based on the orientation or positional relationship in the working state of the present disclosure. It is only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present disclosure.

[0076] In the description of the present disclosure, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "joined", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0077] In the description of the present disclosure, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over", and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath", and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0078] In the description of the present disclosure, the meaning of "a plurality of" is two or more (including two), unless otherwise clearly and specifically limited.

[0079] In the description of the present disclosure, the same reference numerals represent the same components, and for the sake of brevity, in different embodiments, the detailed description of the same components is omitted. It should be understood that the thickness, length, and other dimensions of various components shown in the drawings of the embodiments of the present disclosure, as well as the overall thickness, length, and other dimensions of the integrated device, are only for illustrative purposes and should not constitute any limitation to the present disclosure.

[0080] As part of the creative concept of the present disclosure, before describing the embodiments of the present disclosure, it is necessary to analyze the reasons for the problem that the light guide plate contacts and squeezes the light-emitting unit after expansion in the related art, and obtain the technical solutions of the embodiments of the present disclosure through reasonable analysis.

[0081] In the related art, a display device generally includes a display panel and a backlight module disposed opposite to the display panel. The backlight module is mainly responsible for providing sufficient and evenly distributed light sources for the display panel so that the display panel can display images normally. Light-emitting diodes (LEDs) are used as typical point light sources in the backlight module. Usually, multiple LEDs are used as a point light source array and are arranged on the surface of the circuit board of the light source to form an LED light bar. The multiple LEDs emit line light sources under the drive of the circuit board, and then the light guide plate of the backlight module changes the light emission direction to obtain a uniform surface light source and provides it to the display panel. The backlight module can be divided into a direct-lit backlight module and a side-lit backlight module according to different light-incidence methods; for the side-lit backlight module, the light bar is usually arranged on the side of the light guide plate, and the light emitted by the LEDs can be evenly projected onto the display panel through the light guide plate; and since the light bar is located on the side of the light guide plate, the side-lit backlight module can be thinner and more lightweight, and the display effect is also more uniform.

[0082] However, in the side-lit backlight module, the light guide plate is generally made of a material with a high light transmittance, such as polymethyl methacrylate (PMMA) or methyl methacrylate-styrene copolymer (MS). Due to its material properties, the light guide plate will expand when it is in a high-temperature or high-humidity environment, causing the side of the light guide plate to contact and squeeze the LEDs, resulting in damage to the LEDs and the light bar, and further affecting the light-incidence effect.

[0083] Therefore, the present disclosure provides a backlight module and a display device to solve the technical problem of how to avoid the expanded light guide plate from contacting and squeezing the LEDs (i.e., the light-emitting units) in the prior art.

[0084] The following elaborates in detail on the technical solutions of the embodiments of the present disclosure with reference to the accompanying drawings. The technical features involved in different embodiments of the present disclosure described below can be combined with each other as long as they do not conflict with each other.

[0085] In the description of the present disclosure, taking the display device being statically placed on the ground in the vertical direction as an example, the first direction is the front-rear direction (thickness direction) of the display device, that is Figure 1 and Figures 3 to 10 the X direction shown, and the second direction is the left-right direction of the display device, that is Figures 1 to 4 and Figures 6 to 10The Y direction shown, the third direction is the up and down direction of the display device, that is Figure 1 , Figure 2 , Figures 5 to 8 and Figure 10 the Z direction shown.

[0086] Refer to Figures 3 to 10 , Figure 3 which shows a schematic diagram of a bottom view state of a display device including a backlight module, Figure 4 which shows the structural relationship between the components of the backlight module and the positional relationship between the backlight module and the display panel, Figure 5 which shows an arrangement mode between the protrusion 72 and the light-emitting unit 52, Figure 6 which shows the assembly relationship between the rubber frame 7 and the light guide plate 2, Figures 7 to 9 which shows the structural relationship between the components of the rubber frame 7, Figure 10 which shows the structural relationship between the lamp bar 5 and the heat dissipation frame 6.

[0087] As Figure 4 shown, in an embodiment of the present disclosure, a backlight module is provided, including a back plate 1, a light guide plate 2, an optical film 3, a lamp bar 5 and a rubber frame 7; wherein, the optical film 3 and the light guide plate 2 are stacked on one side of the back plate 1 in sequence along the first direction, the lamp bar 5 is disposed opposite to the side of the light guide plate 2, the light emitted by the lamp bar 5 can be projected onto the display panel 8 after the direction is changed by the light guide plate 2, the rubber frame 7 is fixedly connected to the back plate 1 and surrounds the outer periphery of the light guide plate 2, and a protrusion 72 is provided on the rubber frame 7, and the protrusion 72 is located between the lamp bar 5 and the light guide plate 2 and can prevent the expanded light guide plate 2 from contacting and squeezing the lamp bar 5.

[0088] In this embodiment, as Figure 4 and Figure 6 shown, the light guide plate 2 is generally in the shape of a rectangular plate, and it can be stacked and installed on the inner side of the back plate 1 along the first direction. The light guide plate 2 is mainly used to change the outgoing direction of the light emitted by the lamp bar 5 and uniformly guide the light to the back of the display panel 8.

[0089] In addition, in order to better reflect light, a reflective sheet 4 can be further provided on the side of the light guide plate 2 facing the back plate 1, and the reflective sheet 4 is stacked between the light guide plate 2 and the back plate 1 along the first direction. The reflective sheet 4 can receive the light emitted by the lamp bar 5 and reflect it back to the light guide plate 2 to improve the utilization rate of light.

[0090] Furthermore, a light incident surface 21 is provided on the outer peripheral side of the light guide plate 2, and the light incident surface 21 is configured to allow the light emitted by the lamp bar 5 to enter the light guide plate 2 from the light incident surface 21.

[0091] Optionally, the light incident surface 21 can be one or more of the top side, bottom side, left side, and right side of the light guide plate 2.

[0092] In this embodiment, if Figure 4 and Figure 6 As shown, the optical film 3 is roughly in the shape of a rectangular plate, and its outer contour can be adapted to the outer contour of the light guide plate 2. The optical film 3 is stacked along the first direction on the side of the light guide plate 2 away from the back plate 1. The optical film 3 may include a diffusion film, a brightness enhancement film, etc., which are used to further adjust the distribution of light and enhance the brightness, so that the light is more evenly irradiated onto the display panel 8.

[0093] In this embodiment, if Figure 4 , Figure 5 and Figure 10 As shown, the light bar 5 includes a circuit board 51 and a light-emitting unit 52 . The circuit board 51 and the light-emitting unit 52 are electrically connected, and the circuit board 51 can drive the light-emitting unit 52 to emit light.

[0094] In addition, the light bar 5 can be installed on the heat sink 6, and the heat sink 6 can be fixed on the back plate 1; by setting the heat sink 6, the connection between the light bar 5 and the back plate 1 can be achieved, and the heat sink 6 can also dissipate heat and cool the light bar 5.

[0095] Furthermore, the circuit board 51 is substantially in the shape of a long strip, and can be disposed opposite to the light incident surface 21 along the second direction; wherein, a side of the circuit board 51 away from the light incident surface 21 can be installed on the heat dissipation frame 6 .

[0096] Furthermore, the light-emitting unit 52 is arranged on the side of the circuit board 51 facing the light incident surface 21 ; the light-emitting unit 52 is configured to emit light toward the light incident surface 21 , and the light is changed in an exit direction by the light guide plate 2 and provided to the display panel 8 through the optical film 3 .

[0097] Optionally, the light emitting unit 52 may be an LED lamp bead.

[0098] Optionally, there are multiple light-emitting units 52, and the multiple light-emitting units 52 are arranged on the circuit board 51 at intervals along the third direction; wherein the third direction is perpendicular to the plane formed by the first direction and the second direction.

[0099] By arranging multiple light-emitting units 52 on the circuit board 51, the multiple light-emitting units 52 can simultaneously emit light to the light incident surface 21 of the light guide plate 2. The light guide plate 2 can convert these line light sources into surface light sources to form a backlight light source with better uniformity to enhance the display effect of the product.

[0100] In this embodiment, if Figures 4 to 9As shown in the figure, the rubber frame 7 has an extension plate 71 extending in the second direction, and the extension plate 71 is located inside the backlight module; a protrusion 72 is provided on the side of the extension plate 71 facing the back plate 1, and the protrusion 72 is provided between the circuit board 51 and the light incident surface 21 to block the expanded light guide plate 2 from contacting and squeezing the light emitting unit 52 and the circuit board 51.

[0101] Since the protrusion 72 is connected to the rubber frame 7 through the extension plate 71, and the rubber frame 7 is fixedly connected to the back plate 1, the rubber frame 7 and the back plate 1 can bear the extrusion force from the expanded light guide plate 2 together with the protrusion 72, which can increase the structural strength of the protrusion 72 and improve the blocking effect.

[0102] Further, the surface of the protrusion 72 facing the light incident surface 21 is the blocking surface 721, and the surface of the light emitting unit 52 facing the light incident surface 21 is the light emitting surface 521; wherein, in the second direction, the maximum distance between the blocking surface 721 and the light incident surface 21 is less than the minimum distance between the light emitting surface 521 and the light incident surface 21.

[0103] By providing a protrusion 72 on the extension plate 71 of the rubber frame 7, the protrusion 72 is located between the circuit board 51 and the light incident surface 21 of the light guide plate 2, and the blocking surface 721 of the protrusion 72 is closer to the light incident surface 21 of the light guide plate 2 than the light emitting surface 521 of the light emitting unit 52. After the light guide plate 2 expands, its light incident surface 21 will first contact the protrusion 72, and the protrusion 72 can block the light incident surface 21 of the light guide plate 2 from continuing to move towards the light emitting unit 52 and squeezing the light emitting unit 52, so as to prevent the expanded light guide plate 2 from damaging the light emitting unit 52.

[0104] Further, the orthographic projection of the protrusion 72 on the plane where the light incident surface 21 is located does not coincide with the orthographic projection of the light emitting unit 52 on the plane where the light incident surface 21 is located.

[0105] Adopting the design that the orthographic projections of the protrusion 72 and the light emitting unit 52 on the plane where the light incident surface 21 is located do not coincide can make the protrusion 72 arranged outside the path of the light emitted by the light emitting unit 52 towards the light incident surface 21, so as to prevent all the light emitted by the light emitting unit 52 from being blocked by the protrusion 72 and enable the light to be smoothly emitted to the light incident surface 21 and enter the light guide plate 2.

[0106] It should be noted that since the light source emitted by the light emitting unit 52 has a certain range of beam angles, when the orthographic projections of the protrusion 72 and the light emitting unit 52 on the plane where the light incident surface 21 is located do not coincide, the protrusion 72 may also block a part of the light from entering the light guide plate 2; therefore, in order to reduce the influence of the protrusion 72 on the light blocking, the distance between the protrusion 72 and the light emitting unit 52 in the third direction can be adjusted for optimization to achieve the purpose that the protrusion 72 does not block the light at all.

[0107] SeeFigure 4 , Figure 4 A first gap a between the protrusion 72 and the circuit board 51 is shown.

[0108] In some embodiments, Figure 4 As shown, in the second direction, there is a first gap a between the protrusion 72 and the circuit board 51 ; wherein the first gap a is the minimum distance between the side of the protrusion 72 facing away from the light incident surface 21 and the side of the circuit board 51 facing the light incident surface 21 .

[0109] Since the light guide plate 2 will apply an extrusion force to the protrusion 72 after expansion, by setting a first gap a between the protrusion 72 and the circuit board 51, the extrusion force on the protrusion 72 can be prevented from being transmitted to the circuit board 51, so as to prevent the circuit board 51 from being deformed due to the extrusion force of the light guide plate 2 and affecting the light entry effect of the light strip 5.

[0110] It should be understood that in an edge-entry backlight module, the circuit board 51 is usually a strip-shaped thin plate structure, and its own strength and connection strength in the backlight module are average. The circuit board 51 is easily deformed or even damaged under the action of external force; therefore, when designing the overall structure, the extrusion force of the expanded light guide plate 2 should be avoided from being transmitted to the circuit board 51 to reduce the impact on the circuit board 51.

[0111] It should be noted that when designing the size of the first gap a, it is also necessary to consider the deformation of the protrusion 72 after being squeezed by the light guide plate 2. The first gap a should be able to accommodate the deformation of the protrusion 72 and ensure that the deformed protrusion 72 does not contact the circuit board 51 to avoid the extrusion force on the protrusion 72 being transmitted to the circuit board 51.

[0112] See also Figure 4 , Figure 4 A second gap b between the protrusion 72 and the light guide plate 2 is shown.

[0113] In some embodiments, Figure 4 As shown, in the second direction, there is a second gap b between the protrusion 72 and the light guide plate 2 ; wherein the second gap b is the minimum distance between the blocking surface 721 and the light incident surface 21 .

[0114] By setting a second gap b between the protrusion 72 and the light guide plate 2, the light guide plate 2 can expand freely before touching the protrusion 72, that is, the second gap b allows the light guide plate 2 to have a reasonable expansion range; moreover, the protrusion 72 blocks the further expansion of the light guide plate 2 only when the light guide plate 2 expands to a certain range, which can relatively reduce the time that the protrusion 72 and the rubber frame 7 and other structures are subjected to the extrusion force, thereby extending the service life of the protrusion 72 and the rubber frame 7 and other structures.

[0115] It should be noted that the existence of the second gap b can reduce the size of the protrusion 72 in the second direction and create a certain space between the protrusion 72 and the light incident surface 21. The light emitted by the light emitting unit 52 towards the light incident surface 21 can exit from this space to the light incident surface 21 and enter the light guide plate 2. This structural design can further reduce the blocking effect of the protrusion 72 on the light.

[0116] See Figure 5 and Figures 7 to 9 , Figure 5 which shows the arrangement of multiple protrusions 72, Figure 7 and Figure 8 which shows the structural relationship between the protrusion 72, the extension plate 71 and the rubber frame 7, Figure 9 which shows the structural relationship between the reinforcing rib 73 and the protrusion 72 and the extension plate 71.

[0117] In some embodiments, as Figures 7 to 9 shown, the protrusion 72 and the extension plate 71 are integrally formed; alternatively, the protrusion 72, the extension plate 71 and the rubber frame 7 are integrally formed.

[0118] By integrally forming the protrusion 72 and the extension plate 71 or both of them and the rubber frame 7, the connection strength between the protrusion 72, the extension plate 71 and the rubber frame 7 can be enhanced. The integrally formed structure will also make the structural strength of the protrusion 72 greater, improving the resistance of the protrusion 72 to the expanded light guide plate 2, so that the protrusion 72 will not easily fall off after being squeezed by the light guide plate 2.

[0119] Optionally, the way of integrally forming the protrusion 72, the extension plate 71 and the rubber frame 7 can be by integral injection molding.

[0120] Integrally forming the protrusion 72, the extension plate 71 and the rubber frame 7 by integral injection molding has simple process, low cost, and no assembly is required between the three, which helps to improve the assembly efficiency of the whole module.

[0121] It should be understood that the protrusion 72, the extension plate 71 and the rubber frame 7 can also be fixed by connection methods such as locking with bolt assemblies, and the present disclosure does not limit this here.

[0122] Furthermore, as Figure 9 shown, a reinforcing rib 73 is provided between the protrusion 72 and the extension plate 71; wherein, the reinforcing rib 73 is connected between the side of the protrusion 72 facing away from the light incident surface 21 and the side of the extension plate 71 facing the back plate 1.

[0123] By providing the reinforcing rib 73 between the protrusion 72 and the extension plate 71, the connection reliability between the protrusion 72 and the extension plate 71 can be enhanced; moreover, by arranging the reinforcing rib 73 on the side of the protrusion 72 facing away from the light incident surface 21, the protrusion 72 can have a stronger ability to resist deformation.

[0124] Optionally, the reinforcing rib 73 may be in the shape of a triangular prism.

[0125] Optionally, the reinforcing rib 73 is integrally formed with the protrusion 72 and the extension plate 71 .

[0126] Optionally, there are multiple reinforcing ribs 73 , and the multiple reinforcing ribs 73 are arranged between the protrusion 72 and the extension plate 71 along the third direction.

[0127] It should be noted that when a reinforcing rib 73 is designed in the present disclosure, the first gap a between the protrusion 72 and the circuit board 51 should refer to the minimum distance between the side of the reinforcing rib 73 away from the protrusion 72 along the second direction and the side of the circuit board 51 facing the light incident surface 21.

[0128] Furthermore, if Figures 7 to 9 As shown, the blocking surface 721 on the protrusion 72 is a plane.

[0129] Since the light guide plate 2 can contact the blocking surface 721 of the protrusion 72 after expansion, the blocking surface 721 is designed to be a plane, so that the extrusion force applied by the light guide plate 2 on the protrusion 72 can be more evenly distributed on the protrusion 72, so that the protrusion 72 is evenly stressed and not easy to bend.

[0130] Of course, the blocking surface 721 may also be a curved surface that is recessed along the second direction toward the circuit board 51 , or a curved surface that is convex along the second direction toward the light incident surface 21 , etc., and the present disclosure is not limited thereto.

[0131] Furthermore, if Figure 5 and Figure 8 As shown, there are multiple protrusions 72, and the multiple protrusions 72 are arranged on the extension plate 71 at intervals along the third direction; wherein the third direction is perpendicular to the plane formed by the first direction and the second direction.

[0132] Optionally, the plurality of protrusions 72 are arranged at equal intervals.

[0133] Optionally, the protrusion 72 may be disposed between two adjacent light emitting units 52 ; preferably, in the third direction, the protrusion 72 is centrally disposed between two adjacent light emitting units 52 .

[0134] By arranging multiple protrusions 72 on the extension plate 71, the multiple protrusions 72 can jointly block the light incident surface 21 of the expanded light guide plate 2, and can effectively prevent the light incident surface 21 of the light guide plate 2 from continuing to move toward the light-emitting unit 52 and squeeze the light-emitting unit 52, so as to avoid the expanded light guide plate 2 from damaging the light-emitting unit 52.

[0135] See also Figure 4 , Figure 6 andFigure 7 , Figure 4 and Figure 6 The positional relationship between the extension plate 71, the optical film 3 and the light guide plate 2 is shown. Figure 7 The stop surface 711 feature on the extension plate 71 is shown.

[0136] In some embodiments, Figure 4 , Figure 6 and Figure 7 As shown, the surface of the extension plate 71 facing the back plate 1 is a limiting surface 711 , and a portion of the limiting surface 711 abuts against an edge of the optical film 3 facing away from the light guide plate 2 .

[0137] By making the limiting surface 711 of the extension plate 71 abut against the edge of the optical film 3, and at the same time because the extension plate 71 is connected to the rubber frame 7, and the rubber frame 7 is fixedly connected to the back plate 1, the extension plate 71 and the back plate 1 can be relatively fixed; this structural design, using the limiting surface 711 of the extension plate 71 and cooperating with the inner surface of the back plate 1, can limit the stacked optical film 3 and the light guide plate 2 between the extension plate 71 and the back plate 1, thereby enhancing the overall structural stability of the backlight module.

[0138] It should be noted that the limiting surface 711 of the extension plate 71 abuts against the edge of the optical film 3 along the first direction. When the light guide plate 2 expands, the expansion of the light guide plate 2 in the first direction will be suppressed by the extension plate 71, which can avoid excessive deformation of the light guide plate 2 in the first direction (the thickness direction of the backlight module), thereby avoiding affecting the structural layout of the backlight module in the thickness direction.

[0139] See also Figure 1 , Figure 2 and Figure 4 , Figure 1 and Figure 2 shows a schematic diagram of the external structure of the display device, Figure 4 A schematic diagram of the internal structure of a display device is shown.

[0140] like Figure 1 , Figure 2 and Figure 4 As shown, a display device is also provided in an embodiment of the present disclosure, comprising any one or more backlight modules and a display panel 8 in the above embodiments.

[0141] Since the display device includes the backlight module in the above embodiment, the display device can achieve the same technical effect as the backlight module, which will not be described in detail here.

[0142] Furthermore, the display panel 8 is stacked along the first direction on a side of the optical film 3 away from the light guide plate 2 , and the display panel 8 is connected to a side of the extension plate 71 away from the back plate 1 .

[0143] Among them, the display panel 8 is connected to the extension board 71, and the extension board 71 has a bearing effect on the display panel 8.

[0144] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than to limit them; although the present disclosure has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present disclosure, and they should all be covered by the scope of the claims and the description of the present disclosure. The present disclosure is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A backlight module, characterized in that: include: Back panel; A light guide plate, the light guide plate is stacked on one side of the back plate along a first direction, and a light incident surface is arranged on an outer peripheral side of the light guide plate; An optical film, wherein the optical film is stacked along the first direction and arranged on a side of the light guide plate away from the back plate; A light bar, the light bar comprising: A circuit board, wherein the circuit board and the light incident surface are arranged opposite to each other along a second direction; A light-emitting unit, the light-emitting unit is electrically connected to the circuit board, and the light-emitting unit is arranged on a side of the circuit board facing the light incident surface; The light emitting unit is configured to emit light toward the light incident surface, and the light is changed in an emission direction by the light guide plate and provided to the display panel through the optical film; A plastic frame, the plastic frame is fixedly connected to the back plate and is arranged around the outer periphery of the light guide plate; The plastic frame has an extension plate extending along the second direction, and a protrusion is provided on a side of the extension plate facing the back plate; Wherein, the protrusion is arranged between the circuit board and the light incident surface; The orthographic projection of the protrusion on the plane where the light incident surface is located does not overlap with the orthographic projection of the light emitting unit on the plane where the light incident surface is located; The surface of the protrusion facing the light incident surface is a blocking surface, and the surface of the light emitting unit facing the light incident surface is a light emitting surface; In the second direction, a maximum distance between the blocking surface and the light incident surface is smaller than a minimum distance between the light emitting surface and the light incident surface.

2. The backlight module according to claim 1, characterized in that: In the second direction, there is a first gap between the protrusion and the circuit board; The first gap is the minimum distance between a side of the protrusion facing away from the light incident surface and a side of the circuit board facing the light incident surface.

3. The backlight module according to claim 1 or 2, characterized in that: In the second direction, there is a second gap between the protrusion and the light guide plate; Wherein, the second gap is the minimum distance between the blocking surface and the light incident surface.

4. The backlight module according to claim 1, characterized in that: The protrusion is made integrally with the extension plate; or, The protrusion, the extension plate and the rubber frame are made in one piece.

5. The backlight module according to claim 1 or 4, characterized in that: A reinforcing rib is provided between the protrusion and the extension plate; Wherein, the reinforcing rib is connected between a side of the protrusion facing away from the light incident surface and a side of the extension plate facing the back plate.

6. The backlight module according to claim 1 or 4, characterized in that: The blocking surface is a plane.

7. The backlight module according to claim 1 or 4, characterized in that: The number of the protrusions is multiple, and the multiple protrusions are arranged on the extension plate at intervals along the third direction; The third direction is perpendicular to a plane formed by the first direction and the second direction.

8. The backlight module according to claim 1, characterized in that: There are multiple light-emitting units, and the multiple light-emitting units are arranged on the circuit board at intervals along the third direction; The third direction is perpendicular to a plane formed by the first direction and the second direction.

9. The backlight module according to claim 1, characterized in that: The surface of the extension plate facing the back plate is a limiting surface, and part of the limiting surface abuts against an edge of the optical film facing away from the light guide plate.

10. A display device, characterized in that: A display panel and a backlight module as claimed in any one of claims 1 to 9; The display panel is stacked along the first direction on a side of the optical film away from the light guide plate, and the display panel is connected to a side of the extension plate away from the back plate.

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