A rigid reflector and a direct-lit backlight module

Abstract

This utility model discloses a rigid reflector and a direct-lit backlight module. The rigid reflector includes: a reflector formed by injection molding; the reflector includes a reflector body and multiple reflective cups, which are arranged in a matrix on the reflector body; the end face of the reflector body facing away from the multiple reflective cups is a planar structure, and a fixing structure for fixing a back plate is provided on the periphery of the reflector body. The direct-lit backlight module includes: a back plate, a lamp plate, optical elements, and the aforementioned rigid reflector. The lamp plate includes a substrate and multiple LEDs, which are arranged in a matrix on the substrate. The back plate, substrate, reflector, and optical elements are stacked sequentially, and the LEDs are located at the opening of the reflector; the planar structure is fixedly connected to the substrate, and the inner sidewall of the back plate is fixedly connected to the fixing structure. This utility model can improve the problem of reflector warping during assembly and has the characteristics of efficient assembly, making the direct-lit backlight module have the characteristics of high assembly efficiency and good optical effect.

Description

Technical Field

[0001] This utility model belongs to the field of liquid crystal display technology, specifically relating to a rigid reflector and a direct-lit backlight module. Background Technology

[0002] A backlight module is a device located behind an LCD display that provides a light source. The luminous effect of the backlight module directly affects the visual effect of the LCD display module. The LCD itself does not emit light; the graphics or characters it displays are the result of the modulation of light generated by the backlight module. The position of the light source varies depending on the size of the LCD panel. Backlight modules are categorized into direct-lit backlight modules, where the light source is placed directly below the module, and edge-lit backlight modules, which are suitable for smaller panels and have the light source placed on the side.

[0003] In direct-lit backlight modules, to achieve better zoned display effects, a reflective segmentation mechanism is typically used as the reflector, thus isolating the direct-lit backlight module into individual display zones. The backlight module's reflector consists of multiple reflective cups, each with one or more openings to accommodate one or more LED light sources. This makes it suitable for direct-lit lamp panel structures with different LED pitch values, such as automotive backlight modules.

[0004] The reflector is fixed to the back panel with double-sided adhesive. However, since the reflector is generally made by vacuum forming, it is soft and easily deformed during assembly, which affects the bonding area between it and the back panel. In particular, the bonding area between the peripheral edge of the reflector and the back panel is small, which can easily lead to problems such as lifting and cracking. This results in poor assembly of the reflector and affects the optical performance of the backlight module. Utility Model Content

[0005] The purpose of this invention is to disclose a rigid reflector and a direct-lit backlight module, which can ensure the assembly effect of the reflector to guarantee the optical effect of the backlight module.

[0006] To achieve the above objectives, the first aspect of this utility model discloses a rigid reflector, comprising:

[0007] A reflector formed by injection molding;

[0008] The reflector includes a reflector body and multiple reflector cups, which are arranged in a matrix on the reflector body;

[0009] The end face of the reflector body facing away from the multiple reflector cups is a planar structure, and the periphery of the reflector body is provided with a fixing structure for fixing and connecting the back plate.

[0010] As an optional implementation, the reflector body includes a first end face, a second end face, and a frame. The first end face and the second end face are arranged opposite to each other. Multiple reflective cups are formed on the first end face. The second end face has a planar structure. The frame surrounds the periphery of the first end face and the second end face and has a fixing structure.

[0011] As an optional implementation, the fixing structure includes a plurality of protrusions provided on the periphery of the frame, the protrusions being used to fix the recesses of the connecting back plate.

[0012] As an alternative implementation, the side of the protrusion closest to the first end face extends a longer distance away from the frame than the side closest to the second end face, so that the side of the protrusion facing away from the frame is a slope.

[0013] When a protrusion is used to connect a recess, the recess is shorter on the side closer to the first end face than on the side closer to the second end face.

[0014] As an optional implementation, the periphery of the frame is provided with a slanted groove, the side of the slanted groove near the first end face extends toward the inside of the frame compared to the side near the second end face, and the slanted groove is provided on the side of the protrusion near the first end face.

[0015] As an optional implementation, the second end face is provided with a plurality of positioning posts, which are used to fix the positioning groove of the connecting back plate.

[0016] As an optional implementation, the reflector cup includes an open mouth, an opening, and a reflective side. The open mouth and the opening are arranged opposite to each other and pass through the first end face and the second end face respectively. The reflective side surrounds the open mouth and the opening. The positioning post is arranged to avoid the opening. The opening is used to accommodate the LED beads.

[0017] The second aspect of this utility model discloses a direct-lit backlight module, including: a back plate, a lamp plate, optical elements and the aforementioned rigid reflector. The lamp plate includes a substrate and multiple LEDs, which are distributed in a matrix on the substrate. The back plate, substrate, reflector and optical elements are stacked in sequence, and the LEDs are disposed in the opening of the reflector.

[0018] The planar structure is fixedly connected to the substrate, and the inner sidewall of the back plate is fixedly connected to the fixed structure.

[0019] As an optional implementation, the backplate, substrate, reflector, and optical elements are sequentially bonded together with double-sided adhesive.

[0020] As an optional implementation, the reflector has a positioning post on the side facing the substrate, the back plate has a positioning groove adapted to the positioning post on the side facing the substrate, and the substrate has a positioning hole adapted to the positioning post. In the assembled state, the positioning post passes through the positioning hole and is located in the positioning groove.

[0021] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0022] The reflector of this invention is injection molded, resulting in a rigid material that allows for a regular planar structure on the assembly end face, facilitating bonding and fixing. Combined with the peripheral fixing structure, this improves the issue of reflector warping during assembly, ensuring a better assembly effect. Furthermore, the rigid reflector is easier to assemble than the flexible reflector, increasing assembly efficiency. Therefore, the direct-lit backlight module using this reflector features high assembly efficiency and excellent optical performance. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a first-view structural schematic diagram of the rigid reflector of this utility model;

[0025] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0026] Figure 3 This is a structural schematic diagram of the rigid reflector of this utility model from a second perspective;

[0027] Figure 4 yes Figure 3 Enlarged view at point B in the middle;

[0028] Figure 5 This is a structural schematic diagram of the direct-lit backlight module of this utility model;

[0029] Figure 6 yes Figure 5 Enlarged view at point C;

[0030] Figure 7 This is an exploded view of the direct-lit backlight module of this utility model;

[0031] Figure 8 This is a cross-sectional view and a partial enlarged view of the first position of the direct-lit backlight module of this utility model;

[0032] Figure 9 This is a cross-sectional view and a partial enlarged view of the second position of the direct-lit backlight module of this utility model.

[0033] Explanation of key figure labels:

[0034] 1. Reflector; 11. Reflector body; 111. Fixing structure; 1111. Protrusion; 112. First end face; 113. Second end face; 114. Frame; 1141. Sloping groove; 12. Reflector cup; 121. Opening; 122. Opening; 123. Reflective side; 13. Positioning post; 2. Back plate; 21. Recess; 22. Positioning groove; 3. Lamp board; 31. Lamp bead; 32. Substrate; 321. Positioning hole; 4. Double-sided adhesive; 41. First clearance hole; 42. Second clearance hole. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0036] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0037] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0038] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.

[0039] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0040] The technical solution of this utility model will be further described below with reference to the embodiments and accompanying drawings.

[0041] Please see Figure 1 and Figure 3 As shown, this application embodiment provides a rigid reflector, including a reflector 1 formed by injection molding. The reflector 1 includes a reflector body 11 and a plurality of reflector cups 12. The plurality of reflector cups 12 are distributed in a matrix on the reflector body 11. The end face of the reflector body 11 facing away from the plurality of reflector cups 12 is a planar structure. The periphery of the reflector body 11 is provided with a fixing structure 111 for fixing and connecting a back plate 2.

[0042] The reflector 1 is injection molded and has a hard texture, which makes its end face used for assembly a regular planar structure, making it easier to bond and fix. Combined with the peripheral fixing structure 111, it can improve the problem of lifting during the assembly of the reflector 1, thereby ensuring the assembly effect of the reflector 1. Furthermore, the hard reflector is easier to assemble than the soft reflector, which helps to improve the assembly efficiency of the reflector 1.

[0043] Combination Figure 2 and Figure 4 The reflector body 11 includes a first end face 112, a second end face 113, and a frame 114. The first end face 112 and the second end face 113 are arranged opposite to each other. Multiple reflective cups 12 are formed on the first end face 112. The second end face 113 has a planar structure. The frame 114 surrounds the periphery of the first end face 112 and the second end face 113, and the frame 114 is provided with a fixing structure 111. The first end face 112 is positioned away from the back plate 2, and the second end face 113 is positioned towards the back plate 2. The planar structure of the second end face 113 can achieve planar contact and is not easily deformed when assembled onto the back plate 2 or the lamp plate 3 on the back plate 2, so as to ensure a sufficiently large bonding area and firmly fix the bottom of the reflector 1. Combined with the fixed connection between the fixing structure 111 and the side wall of the back plate 2, efficient and high-quality installation of the reflector 1 can be achieved.

[0044] Generally, the first end face 112 is the top end face of the reflector 1, the second end face 113 is the bottom end face of the reflector 1, the top end of the frame 114 is connected to the periphery of the first end face 112, and the bottom end of the frame 114 is connected to the periphery of the second end face 113. Thus, the reflector body 11 is formed by the connection structure of the first end face 112, the second end face 113 and the frame 114, so as to facilitate the forming of the reflector cup 12 on the reflector body 11.

[0045] The fixing structure 111 generally adopts a snap-fit ​​structure, that is, the side wall of the reflector 1 and the side wall of the back plate 2 are fixedly connected by a concave-convex fit. One embodiment may have a slot in the frame 114, and a corresponding protrusion in the side wall of the back plate 2, so that the side wall of the reflector 1 and the side wall of the back plate 2 are fixedly connected by the fit between the protrusion and the slot. Alternatively, as shown in the embodiments of this application, the fixing structure 111 includes a plurality of protrusions 1111 on the periphery of the frame 114, the protrusions 1111 being used to fix and connect the recesses 21 of the back plate 2, so that the side wall of the reflector 1 and the side wall of the back plate 2 are fixedly connected by the fit between the protrusions 1111 and the recesses 21.

[0046] Multiple protrusions 1111 are spaced apart on the periphery of the frame 114. Their specific positions are not limited, as long as they extend toward the inner wall of the back plate 2, thus ensuring smooth engagement between the protrusions 1111 and the recesses 21. The protrusions 1111 can be integrally molded with the reflector body 11 by injection molding, which is convenient for processing. Similarly, the recesses 21 of the back plate 2 can also be integrally molded with the back plate 2 by injection molding, which simplifies the production process of the back plate 2.

[0047] In one or more embodiments, the side of the protrusion 1111 closest to the first end face 112 extends a longer distance away from the frame 114 than the side closest to the second end face 113, so that the side of the protrusion 1111 facing away from the frame 114 is a slope; when the protrusion 1111 is used to connect to the recess 21, the side of the recess 21 closest to the first end face 112 is recessed a shorter distance than the side closest to the second end face. The inclined structure of the protrusion 1111 and the recess 21 facilitates the smooth engagement of the protrusion 1111 with the recess 21 during the assembly of the reflector 1, thereby improving assembly efficiency.

[0048] Furthermore, a sloping groove 1141 is provided on the periphery of the frame 114. The side of the sloping groove 1141 near the first end face 112 extends toward the inner side of the frame 114 compared to the side near the second end face 113. The sloping groove 1141 is located on the side of the protrusion 1111 near the first end face 112. The sloping groove 1141 is located on the top of the protrusion 1111. During injection molding of the reflector 1, the sloping groove 1141 can improve the demolding speed of the molded reflector 1, thereby achieving rapid demolding of the reflector 1.

[0049] Meanwhile, the second end face 113 is provided with a plurality of positioning posts 13, which are used to fix and connect the positioning groove 22 of the back plate 2. Positioning post 13 is just a name and is not limited to a columnar structure. It can be a structure of any shape that protrudes from the second end face 113, as long as it can extend to connect with the positioning groove 22 of the back plate 2. Thus, the precise assembly of the direct-lit backlight module can be achieved by using the cooperation between the positioning post 13 and the positioning groove 22.

[0050] For reflector cup 12, see Figure 1-4 The reflector cup 12 includes an opening 121, an opening 122, and a reflective side 123. The opening 121 and the opening 122 are arranged opposite to each other and respectively penetrate the first end face 112 and the second end face 113. The reflective side 123 surrounds the periphery of the opening 121 and the opening 122. The positioning post 13 is arranged to avoid the opening 122. The opening 122 is used to accommodate the LED chip 31. The reflector cup 12 is used to reflect and refract the light emitted by the LED chip 31 to improve the uniformity and brightness of the light emitted by the backlight module. The reflector cup 12 has a truncated pyramidal structure. During injection molding, it is formed by being recessed from the first end face toward the second end face. The area of ​​the opening 121 is larger than the area of ​​the opening 122. The periphery of the opening 121 and the opening 122 are connected by the reflective side 123. The opening 122 is used to accommodate the LED chip 31. The light emitted by the LED chip 31 is reflected and refracted by the reflective side 123 and then emitted through the opening 121.

[0051] It should be noted that the LED chip 31 and the reflector cup 12 need to be stably assembled, and there should be no relative displacement between them, so as not to affect the light output effect of the backlight module.

[0052] In addition to the above structure, see [link / reference] Figure 5-8 This application embodiment also provides a direct-lit backlight module, including: a back plate 2, a lamp plate 3, optical elements and the aforementioned rigid reflector. The lamp plate 3 includes a substrate 32 and a plurality of lamp beads 31, which are distributed in a matrix on the substrate 32. The back plate 2, the substrate 32, the reflector 1 and the optical elements are stacked sequentially. The lamp beads 31 are disposed in the opening 122 of the reflector 1. The planar structure is fixedly connected to the substrate 32, and the inner sidewall of the back plate 2 is fixedly connected to the fixing structure 111.

[0053] Optical components may include diffusers, light guides, brightness enhancement films, etc., to improve the light output of the backlight module. The backplate 2 is an upward-opening cavity structure, in which the lamp plate 3, optical components, and reflector 1 are all mounted. During assembly, the substrate 32 is laid flat on the backplate 2, the reflector 1 is laid on the substrate 32, and the number and position of the reflector cups 12 are equal to those of the lamp beads 31, allowing the lamp beads 31 to pass through the opening 122. The fixing structure 111 of the reflector 1 is fixedly connected to the side wall of the backplate 2, and then the optical components are laid on the reflector 1. Thus, the backlight module can utilize the reflector 1 to reflect and refract the light emitted by the lamp beads 31, and use optical components to improve the uniformity and brightness of the emitted light, thereby giving the direct-lit backlight module the characteristics of uniform light output and high brightness.

[0054] Furthermore, since the reflector 1 is connected to the substrate 32 plane and the side wall of the reflector 1 is fixedly connected to the side wall of the back plate 2, the reflector 1 can be installed stably and efficiently, thus enabling the direct-lit backlight module to have the characteristics of high assembly efficiency and good optical effect.

[0055] See Figure 7-9 The backplate 2, substrate 32, reflector 1, and optical components are sequentially bonded and fixed using double-sided adhesive 4. The double-sided adhesive 4 provides good adhesion, enabling stable assembly of the backlight module. Due to the connection structure between the LED bead 31 and the opening 122, the double-sided adhesive 4 between the reflector 1 and the substrate 32 has a first clearance hole 41 corresponding to the LED bead 31, ensuring that the LED bead 31 can smoothly pass through the opening 122.

[0056] A positioning post 13 is provided on the side of the reflector 1 facing the substrate 32. A positioning groove 22 adapted to the positioning post 13 is provided on the side of the back plate 2 facing the substrate 32. A positioning hole 321 adapted to the positioning post 13 is provided on the substrate 32. In the assembled state, the positioning post 13 passes through the positioning hole 321 and is located in the positioning groove 22. The connection structure of the positioning post 13, the positioning hole 321 and the positioning groove 22 can ensure the installation accuracy between the reflector 1, the lamp plate 3 and the back plate 2, so as to ensure the light output effect of the backlight module. The double-sided adhesive 4 between the back plate 2 and the substrate 32 and the double-sided adhesive 4 between the substrate 32 and the reflector 1 are provided with a second clearance hole 42 corresponding to the positioning post 13, so as to ensure that the positioning post 13 can pass smoothly through the positioning hole 321 and extend into the positioning groove 22.

[0057] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

Claims

1. A hard reflector characterized in that, include: A reflector formed by injection molding; The reflector includes a reflector body and multiple reflective cups, with the multiple reflective cups distributed in a matrix on the reflector body; The end face of the reflector body facing away from the plurality of reflector cups is a planar structure, and the periphery of the reflector body is provided with a fixing structure for fixing and connecting the back plate.

2. The hard reflector shell of claim 1, wherein: The reflector body includes a first end face, a second end face, and a frame. The first end face and the second end face are arranged opposite to each other. A plurality of reflective cups are formed on the first end face. The second end face has a planar structure. The frame surrounds the periphery of the first end face and the second end face. The frame is provided with the fixing structure.

3. The hard reflector shell of claim 2, wherein: The fixing structure includes a plurality of protrusions provided on the periphery of the frame, the protrusions being used to fix and connect to the recesses of the back plate.

4. The hard reflector shell of claim 3, wherein: The side of the protrusion closest to the first end face extends a longer distance away from the frame than the side closest to the second end face, so that the side of the protrusion facing away from the frame is a slope. When the protrusion is used to connect the recess, the recess is shorter in the distance of the side of the recess near the first end face than the side of the recess near the second end face.

5. The hard reflector shell of claim 3, wherein: The periphery of the frame is provided with a slanted groove, and the side of the slanted groove near the first end face extends toward the inside of the frame compared to the side near the second end face. The slanted groove is provided on the side of the protrusion near the first end face.

6. The hard reflector shell of claim 2, wherein: The second end face is provided with a plurality of positioning posts, which are used to fix and connect the positioning groove of the back plate.

7. The rigid reflector according to claim 6, characterized in that: The reflector cup includes an open mouth, an opening, and a reflective side. The open mouth and the opening are arranged opposite to each other and respectively penetrate the first end face and the second end face. The reflective side surrounds the periphery of the open mouth and the opening. The positioning post is arranged to avoid the opening. The opening is used to accommodate the LED bead.

8. A direct-lit backlight module, characterized in that, include: The back plate, the lamp plate, the optical element, and the rigid reflector according to any one of claims 1-7, wherein the lamp plate includes a substrate and a plurality of lamp beads, the plurality of lamp beads are distributed in a matrix on the substrate, the back plate, the substrate, the reflector and the optical element are stacked in sequence, and the lamp beads are disposed in the opening of the reflector; The planar structure is fixedly connected to the substrate, and the inner sidewall of the back plate is fixedly connected to the fixing structure.

9. The direct-lit backlight module according to claim 8, characterized in that: The back plate, the substrate, the reflector, and the optical element are sequentially bonded together with double-sided adhesive.

10. The direct-lit backlight module according to claim 8, characterized in that: The reflector has a positioning post on the side facing the substrate, the back plate has a positioning groove adapted to the positioning post on the side facing the substrate, and the substrate has a positioning hole adapted to the positioning post. In the assembled state, the positioning post passes through the positioning hole and is located in the positioning groove.

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