A reflector and a direct-lit backlight module

Abstract

This utility model discloses a reflector and a direct-lit backlight module. The reflector is injection molded and includes a reflector body with multiple protrusions on its periphery for fixing and connecting a back plate; multiple reflective cups arranged in a matrix on the reflector body; and perforations on the reflective cups corresponding to the protrusions, with the perforations located near the sidewall of the reflector body. The direct-lit backlight module includes a back plate, a lamp plate, optical elements, and the aforementioned reflector. The lamp plate includes a substrate and multiple LEDs arranged in a matrix on the substrate. The back plate, substrate, reflector, and optical elements are stacked sequentially, with the LEDs located at the openings of the reflector. The back plate has corresponding recesses on the protrusions, and in the assembled state, the protrusions are fixed to the recesses. The perforations allow the structure near the protrusions to have a soft texture, facilitating assembly with the recesses of the back plate. Furthermore, since the perforations are located at the reflective cups corresponding to the protrusions, there is no need to widen the periphery of the reflector.

Description

Technical Field

[0001] This utility model belongs to the field of liquid crystal display technology, specifically relating to a 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] To improve the assembly effect of reflectors, the application of injection-molded reflectors has become a trend, and the peripheral edges of the reflector are generally connected to the back plate via a snap-fit ​​structure. Due to the rigidity of injection-molded reflectors, the peripheral frame of the reflector needs to be widened to facilitate the snap-fit ​​connection between the reflector and the back plate. A hollowed-out structure is also incorporated near the snap-fit ​​structure on the wide frame to give the snap-fit ​​structure some flexibility, facilitating the engagement between the reflector and the back plate. However, the wide frame structure of the reflector increases its size, leading to a larger and heavier backlight module, making it difficult to meet users' requirements for a narrow bezel and lightweight backlight module. Utility Model Content

[0005] The purpose of this utility model is to disclose a reflector and a direct-lit backlight module that can achieve the requirements of narrow bezel and lightweight, and meet the assembly requirements.

[0006] To achieve the above objectives, the first aspect of this utility model discloses a reflector, which is injection molded and includes:

[0007] The reflector body has multiple protrusions on its periphery for fixing and connecting the back plate.

[0008] Multiple reflective cups are arranged in a matrix on the reflector body. The reflective cups corresponding to the protrusions have hollow holes, which are located near the side wall of the reflector body.

[0009] 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 frame surrounds the periphery of the first end face and the second end face. The frame has multiple protrusions and hollow holes are arranged near the side wall of the frame.

[0010] As an alternative implementation, the cutout is made on the side wall of the frame, or the cutout is connected to the side wall of the frame.

[0011] As an optional implementation, the reflector cup includes an opening, an opening, and a reflective side. The opening and the opening are arranged opposite to each other and pass through the first end face and the second end face respectively. The size of the opening is larger than the size of the opening. The reflective side is arranged between the periphery of the opening and the opening and has an inclined structure. The opening is used to accommodate the LED.

[0012] A perforated hole is provided on the second end face. The perforated hole is connected to the opening and extends to the frame so that the reflective side located at the frame has a vertical structure.

[0013] 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.

[0014] When the protrusion is used to connect to the recess of the back plate, 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.

[0015] As an optional implementation, a slanted groove (1141) is provided on the periphery of the frame. The slanted groove (1141) extends toward the inside of the frame on the side near the first end face compared to the side near the second end face. The slanted groove (1141) is provided on the side of the protrusion near the first end face.

[0016] As an optional implementation, the second end face is provided with multiple positioning posts, which are used to fix the positioning groove of the back plate, and the positioning posts are provided to avoid the opening.

[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 reflector. The lamp plate includes a substrate and a plurality of lamp beads, which are distributed in a matrix on the substrate. The back plate, substrate, reflector and optical elements are stacked in sequence, and the lamp beads are disposed in the opening of the reflector.

[0018] The back panel has a corresponding recess for the protrusion, and in the assembled state, the protrusion is fixed to the recess.

[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 has a perforated hole near the protrusion, which makes the structure near the protrusion soft, facilitating assembly with the recessed part of the back plate and thus achieving efficient installation of the reflector. Furthermore, since the perforated hole is located at the reflector cup corresponding to the protrusion, there is no need to widen the peripheral structure of the reflector, giving it a narrow bezel, which is beneficial for meeting the requirements of a narrow bezel and lightweight backlight module. 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 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 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 9This 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. Protrusion; 112. First end face; 113. Second end face; 114. Frame; 1141. Sloping groove; 12. Reflector cup; 121. Opening; 122. Opening; 123. Reflective side; 124. Hole; 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 3-4 As shown, this application embodiment provides a reflector. The reflector 1 is injection molded and includes a reflector body 11 and a plurality of reflector cups 12. The reflector body 11 has a plurality of protrusions 111 for fixing and connecting a back plate 2 on its periphery. The plurality of reflector cups 12 are distributed in a matrix on the reflector body 11. The reflector cups 12 corresponding to the protrusions 111 have hollow holes 124. The hollow holes 124 are located close to the side wall of the reflector body 11.

[0042] The reflector 1 is injection molded, giving it a rigid texture. Combined with a perforated hole 124 near the protrusion 111, this allows the structure near the protrusion 111 to have a flexible texture, facilitating assembly with the recess 21 of the backplate 2, thus achieving efficient installation of the reflector 1. Furthermore, since the perforated hole 124 is located at the reflective cup 12 corresponding to the protrusion 111, there is no need to widen the peripheral structure of the reflector 1, resulting in a narrow bezel. This is beneficial for achieving the requirements of a narrow bezel and lightweight design for the backlight module.

[0043] In one or more embodiments, 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. A plurality of reflective cups 12 are formed on the first end face 112. The frame 114 surrounds the periphery of the first end face 112 and the second end face 113. The frame 114 has a plurality of protrusions 111, and a perforated hole 124 is provided near the side wall of the frame 114. 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. Because the reflector 1 is injection molded, it has the characteristics of being hard and not easily deformed during assembly, thus facilitating installation. Furthermore, the perforated hole 124 allows the frame 114 at the protrusions 111 to have a certain degree of flexibility, facilitating the connection between the protrusions 111 and the recesses 21 of the back plate 2, thereby achieving efficient assembly of the reflector 1. Furthermore, since the perforated hole 124 is located at the reflective cup 12 corresponding to the protrusion 111, rather than on the frame 114 as shown in the prior art, it is not necessary to widen the size of the frame 114 to achieve the purpose of a narrow frame.

[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] To ensure smooth installation of the protrusion 111 and the recess 21, the cutout 124 needs to be located close to the frame 114 to ensure that the frame 114 at the protrusion 111 has a certain degree of flexibility. Therefore, the cutout 124 is formed on the side wall of the frame 114, or the cutout 124 is connected to the side wall of the frame 114. In this way, the strength of the side wall or bottom wall of the frame 114 is weakened, allowing for slight deformation during the assembly of the protrusion 111 and the recess 21, thereby improving assembly efficiency.

[0046] In this embodiment, refer to 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 pass through the first end face 112 and the second end face 113 respectively. The size of the opening 121 is larger than the size of the opening 122. The reflective side 123 surrounds the periphery of the opening 121 and the opening 122 and has a sloping structure. The opening 122 is used to accommodate the lamp bead 31. A hollow hole 124 is provided on the second end face 113. The hollow hole 124 communicates with the opening 122 and extends to the frame 114 so that the reflective side 123 located at the frame 114 has a vertical structure.

[0047] The reflector cup 12 is used to reflect and refract the light emitted by the LED bead 31 to improve the uniformity and brightness of the light emitted by the backlight module. The reflector cup 12 has a truncated pyramidal structure and is formed by being recessed from the first end face to the second end face during injection molding. The area of ​​the opening 121 is larger than the area of ​​the opening 122. The peripheral edges of the opening 121 and the opening 122 are connected by the reflective side surface 123. The opening 122 is used to accommodate the LED bead 31. The light emitted by the LED bead 31 is reflected and refracted by the reflective side surface 123 and then emitted through the opening 121.

[0048] The structure of the reflective cup 12 causes the reflective side 123 to be inclined, and the closer it is to the second end face 113, the thicker the wall of the reflective side 123 becomes. In this embodiment, a hole is made vertically downward at the reflective side 123 located at the frame 114 until it penetrates the second end face 113 and connects to the opening 122, thereby forming a hollow hole 124. The formation of the hollow hole 124 weakens the strength of the side wall and bottom of the frame 114, which facilitates the assembly of the protrusion 111 and the concave part 21.

[0049] 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.

[0050] The side of the protrusion 111 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 111 facing away from the frame 114 is a slope. When the protrusion 111 is used to connect to the recess 21 of the back plate 2, 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 111 and the recess 21 facilitates the smooth engagement of the protrusion 111 with the recess 21 during the assembly of the reflector 1, thereby improving assembly efficiency.

[0051] 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 111 near the first end face 112. The sloping groove 1141 is located on the top of the protrusion 111. 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.

[0052] The second end face 113 is provided with multiple positioning posts 13, which are used to fix and connect to the positioning groove 22 of the back plate 2. The positioning posts 13 are provided to avoid the opening 122. The positioning post 13 is just a name and is not limited to a columnar structure. It can be any shape of structure protruding 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. The positioning post 13 is provided to avoid the opening 122 and the hollow hole 124 to ensure the smooth assembly of the lamp bead 31 and the smooth formation of the hollow structure.

[0053] 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 reflector 1. The lamp plate 3 includes a substrate 32 and a plurality of lamp beads 31. The plurality of lamp beads 31 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 in sequence. The lamp beads 31 are disposed in the opening 122 of the reflector 1. The back plate 2 has a corresponding recess 21 for the protrusion 111. In the assembled state, the protrusion 111 is fixed to the recess 21.

[0054] Optical components may include diffusers, light guides, brightness enhancement films, etc., to improve the light output of the backlight module. The backplate 2 has an upward-opening cavity structure, and the lamp plate 3, optical components, and reflector 1 are all mounted within the cavity of the backplate 2. 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 LED chips 31, allowing the LED chips 31 to pass through the opening 122. The protrusion 111 of the reflector 1 is fixedly connected to the recess 21 of the backplate 2, and then the optical components are laid on the reflector 1. In this way, the backlight module can utilize the reflector 1 to reflect and refract the light emitted by the LED chips 31, and use optical components to improve the uniformity and brightness of the emitted light, thus giving the direct-lit backlight module the characteristics of uniform light output and high brightness.

[0055] Furthermore, the injection molding structure allows the reflector 1 to be planarly connected to the substrate 32, and the sidewall of the reflector 1 is fixedly connected to the sidewall of the backplate 2. Simultaneously, the perforated hole 124 increases the assembly speed of the protrusion 111 and the recess 21, ensuring stable and efficient installation of the reflector 1. This results in a direct-lit backlight module with high assembly efficiency and excellent optical performance. Moreover, the narrow bezel structure of the reflector 1 reduces the overall size and weight of the backlight module, achieving a lightweight design.

[0056] 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.

[0057] 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.

[0058] 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 reflector, characterized in that, The reflector is injection molded, and the reflector includes: The reflector body has multiple protrusions on its periphery for fixing and connecting the back plate; Multiple reflective cups are arranged in a matrix on the reflector body. Each reflective cup corresponding to a protrusion has a perforated hole, which is located near the side wall of the reflector body.

2. The reflector according to claim 1, characterized in that: 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 frame is arranged between the periphery of the first end face and the second end face. The frame is provided with a plurality of protrusions. The hollow holes are arranged near the side wall of the frame.

3. The reflector according to claim 2, characterized in that: The cutout is formed on the side wall of the frame, or the cutout is connected to the side wall of the frame.

4. The reflector according to claim 2, characterized in that: The reflector cup includes an open mouth, an opening, and a reflective side surface. 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 size of the open mouth is larger than the size of the opening. The reflective side surface is arranged between the periphery of the open mouth and the opening and has a sloping structure. The opening is used to accommodate LED beads. The perforated hole is located on the second end face, and the perforated hole communicates with the opening and extends to the frame so that the reflective side located at the frame has a vertical structure.

5. The reflector according to claim 2, characterized in that: 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 to the recess of the back plate, the recess is shorter in the distance near the first end face than it is in the distance near the second end face.

6. The reflector according to claim 2, characterized in that: 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.

7. The reflector according to claim 4, characterized in that: 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, and the positioning posts are arranged to avoid the opening.

8. A direct-lit backlight module, characterized in that, include: The back plate, the lamp plate, the optical element, and the 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 back plate has a corresponding recessed portion corresponding to the protrusion. In the assembled state, the protrusion is fixed to the recessed portion.

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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