Lampshade, light source reflecting cover and COB backlight module

Abstract

The utility model provides a lamp shade, light source reflection cover and COB backlight module, wherein, the lamp shade is used for COB backlight module, including cover body and cover top, cover body is closed in circumferential direction, both ends open structure, and the first end opening forms the open of lamp shade, is equipped with a plurality of first through -hole at least in the circumferential direction of cover body, cover top is the plate -shaped structure, and fixedly connected in the second end opening place of cover body, and its edge and the second end opening edge of cover body seal enclose, cover top includes central region and the peripheral region around central region, wherein, the central region of cover top is closed structure, and the peripheral region is equipped with a plurality of second through -hole, for the visible light ray that shoots from lamp shade interior to outside, and the reflectivity of at least central region is greater than the transmissivity. The utility model can optimize the light propagation path and intensity distribution, improves the uniformity of COB backlight module light -emitting surface light.

Description

Technical Field

[0001] This utility model relates to the field of display technology, and in particular to a lampshade, a light source reflector, and a COB backlight module. Background Technology

[0002] A liquid crystal display (LCD) is an important display device. Its display module includes a backlight module and a liquid crystal module. The backlight module provides uniform and stable light to the liquid crystal module. By controlling the deflection angle of the liquid crystal molecules in the liquid crystal module, the transmittance of the backlight module can be adjusted, allowing pixels of different gray levels and colors to be generated on the liquid crystal module. Therefore, the performance of the backlight module directly affects the display effect of the LCD.

[0003] Backlight modules are mainly classified into direct-lit backlight modules and edge-lit backlight modules according to their light source layout. Direct-lit backlight modules are currently the mainstream backlight solution. Among direct-lit backlight modules, those using COB (Chip-On Board) light sources are called COB backlight modules. In existing COB backlight modules, due to the poor compatibility between traditional lamp covers and the directional light sources such as the LED chips in the COB light source, the light distribution on the light-emitting surface of the COB backlight module is prone to unevenness. Summary of the Invention

[0004] Based on the above situation, the main purpose of this utility model is to provide a lampshade, a light source reflector, and a COB backlight module for COB backlight modules, so as to improve the uniformity of light emitted from the light-emitting surface of the COB backlight module.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] This utility model provides a lampshade for a COB backlight module, which includes a cover body and a top cover; the cover body has a circumferentially closed structure with openings at both ends, the first end opening forming the opening of the lampshade, and at least a plurality of first through holes are provided in the circumferential direction of the cover body; the top cover has a plate-like structure, which is fixedly connected to the second end opening of the cover body, and its edge is sealed and enclosed with the edge of the second end opening of the cover body.

[0007] The canopy includes a central region and a surrounding region around the central region;

[0008] The central area of ​​the lampshade is a closed structure, and the peripheral area is provided with multiple second through holes; for visible light rays emitted from inside the lampshade to the outside, the reflectivity of the central area is greater than the transmittance.

[0009] Preferably, the cover includes four side walls and four transition walls, each side wall being an inwardly recessed concave curved surface, and each transition wall being an outwardly convex curved surface, with adjacent side walls connected by the transition walls.

[0010] Each of the sidewalls has the greatest recess depth at its centerline parallel to the main axis of the cover; two oppositely arranged sidewalls are mirror-symmetrical about a central plane;

[0011] The central plane passes through the central axis of the main axis of the cover and is perpendicular to the reference plane of the two oppositely arranged side walls; the central axis of the main axis of the cover is the axis connecting the geometric center of the closed contour of the outer edge of the openings at both ends of the cover; the reference plane is a virtual plane containing the upper and lower edge contours corresponding to the side walls along the main axis of the cover.

[0012] Preferably, a plurality of the first through holes are distributed circumferentially on each of the sidewalls, and the first through holes are distributed at least at the location of the maximum recess depth.

[0013] Preferably, the first through hole is provided on each of the transition walls, and the opening area of ​​the first through hole on the transition wall is larger than the opening area of ​​the first through hole on the side wall.

[0014] Preferably, the plurality of second through holes on the top of the cover form a plurality of through hole groups around the central region, and the plurality of second through holes are arranged radially at intervals in each through hole group along a direction away from the central region.

[0015] Preferably, the plurality of through-hole groups include a centerline through-hole group and a diagonal through-hole group. The centerline through-hole group has four groups evenly distributed along the circumference of the central region, and the plurality of second through-holes in each group are respectively arranged along the two centerlines of the top cover. The diagonal through-hole group has four groups distributed along the circumference of the central region, and the plurality of second through-holes in each group are respectively arranged along at least the two diagonals of the top cover.

[0016] The number of second through holes in the centerline through hole group is less than the number of second through holes in the diagonal through hole group.

[0017] Preferably, the plurality of through hole groups further includes side through hole groups, with one side through hole group provided on both sides of each of the diagonal through hole groups around the circumference of the central region;

[0018] The straight line containing the center of each second through hole in the side through hole group is parallel to the straight line containing the center of each second through hole in the diagonal through hole group;

[0019] The number of second through holes in the side through hole group is greater than the number of second through holes in the centerline through hole group, but less than the number of second through holes in the diagonal through hole group.

[0020] Preferably, the lampshade further includes a barrier structure and a connecting plate, the barrier structure being disposed around the outer periphery of the lampshade and connected to a first end of the lampshade via the connecting plate; wherein, in a direction perpendicular to the top of the lampshade, the height of the barrier structure is less than the height of the lampshade.

[0021] Preferably, in a direction perpendicular to the top of the cover, the end face of the barrier structure away from the connecting plate is located between the outer surface of the top of the cover and the center line of the first through hole.

[0022] This utility model also provides a light source reflector, which includes a plurality of lampshades as described in any one of the above claims.

[0023] Preferably, the plurality of lampshades are arranged in a matrix, and the connecting plates of each lampshade form an integral plate structure. The portion of the barrier structure located between two adjacent lampshades forms a common convex ridge.

[0024] This utility model also provides a COB backlight module, which includes a light source reflector and a COB light source as described in any of the above claims. The COB light source includes a lamp board and a plurality of light-emitting chips disposed on the lamp board. The lamp cover is disposed on the light-emitting chips one by one, and the opening of the lamp cover is fitted to the lamp board.

[0025] The lampshade provided by this utility model is used in conjunction with each light-emitting chip in the COB light source. The lampshade is placed on each light-emitting chip in a corresponding manner. The central area of ​​the top of the lampshade is closed and the reflectivity of light emitted from inside to outside is greater than the transmittance. This allows the strong light from the center of the light source to be reflected back into the lampshade. After multiple scatterings, the light is emitted again through the first or second through hole, thereby balancing the light intensity at the top of the lampshade and weakening the bright spot in the center. The multiple first through holes on the lampshade and the light emitted from the top of the lampshade form a multi-dimensional light emission system, avoiding the light from concentrating in a single area. The sealed enclosure design of the top of the lampshade and the top edge of the lampshade can prevent light leakage from gaps and the impact of external pollution on the performance stability of the light-emitting chips inside the lampshade. The various features of the lampshade work together to optimize the light propagation path and intensity distribution, thereby improving the uniformity of light emitted from the light-emitting surface of the COB backlight module.

[0026] Other beneficial effects of this utility model will be explained in detail through the introduction of specific technical features and technical solutions in the specific embodiments. Those skilled in the art should be able to understand the beneficial technical effects brought about by the technical features and technical solutions through the introduction of these technical features and technical solutions. Attached Figure Description

[0027] The preferred embodiments of the present invention will now be described with reference to the accompanying drawings.

[0028] Figure 1 This is a schematic diagram of the overall structure of a lampshade according to a preferred embodiment of the present invention;

[0029] Figure 2 for Figure 1 Top view of the central lampshade;

[0030] Figure 3 This is a schematic diagram of the overall structure of the lampshade according to another preferred embodiment of the present invention;

[0031] Figure 4 for Figure 3 Side view of the central lampshade;

[0032] Figure 5 This is a side view of a light source reflector according to a preferred embodiment of the present invention;

[0033] Figure 6 This is a side view of a preferred embodiment of the COB backlight module of this utility model.

[0034] In the picture:

[0035] 10. Cover body; 100. First through hole; 11. Side wall; 12. Transition wall;

[0036] 20. Top of the cover; 200. Second through hole; 210. Centerline through hole group; 220. Diagonal through hole group; 230. Side through hole group;

[0037] 30. Barrier structure; 40. Connecting plate; 50. Lamp board; 60. Light-emitting chip. Detailed Implementation

[0038] The present invention will now be described based on embodiments, but the present invention is not limited to these embodiments. In the following detailed description of the present invention, some specific details are described in detail, but well-known methods, processes, procedures, and elements are not described in detail in order to avoid obscuring the essence of the present invention.

[0039] Furthermore, those skilled in the art should understand that the accompanying drawings provided herein are for illustrative purposes only and are not necessarily drawn to scale.

[0040] Unless the context explicitly requires it, the words "comprising," "including," and similar terms throughout the specification and claims should be interpreted as encompassing rather than being exclusive or exhaustive; that is, meaning "including but not limited to."

[0041] In the description of this invention, it should be understood that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0042] It should be noted that the terms "top," "above," "above," "bottom," and "below" in the text are used solely for ease of expression and understanding. Figure 1 The description is based on the placement state shown, but those skilled in the art will understand that the above directional terms will also be adapted to change when the placement state of the light source reflector changes.

[0043] like Figure 1 As shown, the lampshade provided by this utility model is used in a COB backlight module, which includes a cover body 10 and a cover top 20; the cover body 10 has a structure that is circumferentially closed and open at both ends, with the first end opening forming the opening of the lampshade, and at least a plurality of first through holes 100 are provided in the circumferential direction of the cover body 10; the cover top 20 is a plate-like structure, which is fixedly connected to the second end opening of the cover body 10, and the edge of the plate-like structure is sealed and enclosed with the edge of the second end opening of the cover body 10.

[0044] The dome 20 includes a central region and a surrounding region; wherein, the central region of the dome 20 has a closed structure, and the surrounding region is provided with a plurality of second through holes 200; for visible light rays emitted from inside the lampshade to the outside, under the condition of vertical incidence, at least the reflectivity of the central region is greater than the transmittance, that is, most of the light rays that illuminate the inside of the central region will be reflected back, and some light rays can also pass through the central region.

[0045] It should be noted that, depending on actual needs, the reflectivity of the surrounding area and / or the lampshade 10 for visible light can also be set to be greater than its transmittance. Specifically, the lampshade material can be made of a material with a visible light reflectivity of 70%~76% and a transmittance of 24%~30%.

[0046] Because the light-emitting chips in COB light sources are directional light-emitting devices, the light mainly shines directly along the chip's normal direction (i.e., the direction perpendicular to the chip's light-emitting surface), exhibiting a concentrated axial distribution and a weak circumferential distribution. Furthermore, traditional lampshades are mostly single, enclosed structures or have no differentiated design, failing to effectively guide the directional light. Therefore, the light-emitting surface of COB backlight modules is prone to unevenness issues such as a bright central spot, dark edges, or overlapping local light spots. However, the lampshade for COB backlight modules provided by this invention, through a collaborative design of the cover body 10 and the top cover 20, allows each lampshade to be placed one-to-one on the light-emitting chips in the COB light source, significantly improving the overall light uniformity of the COB backlight module's light-emitting surface.

[0047] In this invention, most of the light from the central high-intensity area of ​​the light-emitting chip is reflected back after reaching the central region of the cover 20, with only a small portion being directly transmitted. The reflected light is emitted through the first through-hole 100 on the cover 10, and some light is eventually emitted through the second through-hole 200 on the cover 20, while some light is also transmitted through the central region. Meanwhile, the light from the weaker area at the edge of the light-emitting chip can be emitted almost directly through the second through-hole 200 in the peripheral area of ​​the cover 20. Even if some light is reflected back, it can still be emitted through the first through-hole 100 on the cover 10 and the second through-hole 200 on the cover 20. Under the combined effect of the above features, the light energy of the light emitting surface of the COB backlight module is made uniform throughout, thereby improving the consistency of the display effect.

[0048] It should be noted that in the lampshade provided by this utility model, the top 20 and the body 10 can be two independent parts that are connected to each other to form the lampshade; the top 20 and the body 10 can also be integrally formed to obtain the lampshade.

[0049] In the above embodiments, such as Figure 1 As shown, the cover 10 includes four side walls 11 and four transition walls 12. Each side wall 11 is a concave curved surface that is recessed inward, and each transition wall 12 is a convex curved surface that is protruding outward. Two adjacent side walls 11 are connected by a transition wall 12.

[0050] Each sidewall 11 has its maximum recess depth at its central axis parallel to the main axis of the cover 10; the two opposing sidewalls 11 are mirror-symmetrical about a central plane. This central plane passes through the central axis of the main axis of the cover 10 and is perpendicular to the reference plane of the two opposing sidewalls 11. Specifically, the central axis of the main axis of the cover 10 is the axis connecting the geometric center of the outer edge closed profile of the first end opening and the geometric center of the outer edge closed profile of the second end opening, and this central axis is parallel to the reference plane of the sidewall 11; the reference plane is a virtual plane containing the upper and lower edge profiles of the corresponding sidewall along its height direction (parallel to the main axis of the cover 10). The geometric center is the intersection of the diagonals of the circumscribed rectangle of the closed profile.

[0051] For example, such as Figure 1As shown, the cover 10 is a quadrilateral cylindrical structure extending along its central axis. Four side walls 11 surround this central axis to form a cylindrical structure. Each side wall 11 extends along the main axis of the cover 10, and its height is consistent with the height of the cover 10 along its main axis. The original outline of each side wall 11 is a rectangular plane, which is then recessed inward to form a concave curved surface. The inward recess is based on the central axis of the main axis of the cover 10, with the rectangular plane recessed towards this central axis to form a concave curved surface. The transition wall 12 protrudes away from the central axis of the main axis of the cover 10. Along the main axis of the cover 10, the height of the transition wall 12 is consistent with the height of the side walls 11. The two ends of the transition wall 12 are tangentially connected to the ends of adjacent side walls 11, forming a continuous cylindrical curved surface without sharp edges. In other words, the four side walls and four transition walls form a cylindrical structure with openings of the same size at both ends, specifically a quadrilateral cylindrical structure.

[0052] It should be noted that the height direction of the sidewall 11 is parallel to the main axis of the cover 10 and perpendicular to the circumference of the cover 10. Along the circumference of the sidewall 11, from the center line of the height direction of the sidewall 11 towards the transition walls 12 on both sides, the depth of the concavity of the sidewall 11 gradually decreases to facilitate a smooth connection with the transition walls 12. That is to say, along the circumference of the sidewall 11, each sidewall 11 exhibits a shape in which the concavity is deepest in the middle and gradually becomes shallower towards the sides.

[0053] The central plane includes a vertical central plane and a horizontal central plane, and the vertical and horizontal central planes are orthogonal to each other. The vertical central plane can be defined as a plane extending along the front-back direction of the enclosure 10, and the horizontal central plane is a plane extending along the left-right direction of the enclosure 10. Specifically, the left and right side walls 11 of the enclosure 10 are mirror-symmetrical about the vertical central plane, and the front and rear side walls 11 are mirror-symmetrical about the horizontal central plane.

[0054] In the above embodiment, a plurality of first through holes 100 are distributed circumferentially on each sidewall 11, and the first through holes 100 are distributed at least at the location of the maximum recess depth.

[0055] Specifically, multiple first through holes 100 are evenly distributed along the waist centerline on each side wall 11, parallel to the plane containing the openings at both ends of the cover 10. The waist centerline is an arc extending circumferentially along the side wall 11. The centers of adjacent first through holes 100 are equidistant from each other along this waist centerline.

[0056] Each transition wall 12 is also provided with a first through hole 100, and the opening area of ​​the first through hole 100 on the transition wall 12 is larger than the opening area of ​​the first through hole 100 on the side wall 11.

[0057] Since the area where the transition wall 12 is located is the edge of the lampshade, the light has a longer path and suffers more loss compared to the middle area of ​​the side wall 11, which can easily lead to insufficient brightness at the edges and corners. By increasing the opening area of ​​the first through hole 100 on the transition wall 12, more light can be emitted from the first through hole 100 on the transition wall 12, thereby balancing the light output uniformity of the entire lampshade and avoiding the problem of bright center and dark edges in the backlight of the COB backlight module.

[0058] In the above embodiment, a plurality of second through holes 200 on the top cover 20 form a plurality of through hole groups around the central region, and a plurality of second through holes 200 are arranged radially at intervals in each through hole group along the direction away from the central region.

[0059] The vias are arranged in a centrally symmetrical and locally densely packed manner. This symmetrical and dense arrangement of vias matches the light-emitting range of the LED. The central region has a closed structure to match the high-intensity areas of the LED and prevent localized over-brightness. The secondary vias 200 arranged in the peripheral region are used to receive the weak light from the edges of the LED. The evenly distributed secondary vias 200 disperse and guide the light, reducing the problem of uneven light spots in the COB backlight module.

[0060] Specifically, such as Figure 2 As shown, the multiple through-hole groups include a centerline through-hole group 210 and a diagonal through-hole group 220. The centerline through-hole group 210 has four groups evenly distributed circumferentially along the central region, and the multiple second through-holes 200 of each centerline through-hole group 210 are respectively arranged along two centerlines of the top cover 20. The diagonal through-hole groups 220 also have four groups distributed circumferentially along the central region, and the multiple second through-holes 200 of each diagonal through-hole group 220 are respectively arranged along at least two diagonals of the top cover 20. The number of second through-holes 200 in the centerline through-hole group 210 is less than the number of second through-holes 200 in the diagonal through-hole group 220.

[0061] Specifically, each centerline through-hole group 210 has two second through-holes 200. Each diagonal through-hole group 220 has five second through-holes 200. Around the circumference of the central region, a side through-hole group 230 can also be provided on each side of the diagonal through-hole group 220. The straight line containing the center of each second through-hole 200 in the side through-hole group 230 is parallel to the straight line containing the center of each second through-hole 200 in the diagonal through-hole group 220. Each side through-hole group 230 has four second through-holes 200.

[0062] The central light intensity part of the light-emitting chip corresponds to the central area of ​​the cover 20. By setting four sets of centerline through holes 210 along the circumference of the central area on the center line of the cover 20, the proportion of through holes in this area is reduced, which can prevent the light from the central light intensity part of the light-emitting chip from being emitted too much through the second through hole 200 in the centerline through hole group 210, thus ensuring the directional guidance of the strong light.

[0063] By setting four diagonal through-hole groups 220 along the diagonal of the top cover 20 along the circumference of the central area, and setting a side through-hole group 230 on both sides of each diagonal through-hole group 220, the light from the weak edge of the light-emitting chip can be directly emitted from the lamp cover through the second through-hole 200 in the diagonal through-hole group 220 and the side through-hole group 230, which alleviates the optical difference of the light-emitting chip being bright in the center and dark around the periphery, thereby improving the overall light transmission uniformity of the lamp cover.

[0064] Therefore, the differentiated design of the second through hole 200 on the top cover 20 precisely matches the light intensity distribution characteristics of the light-emitting chip, compensates for the surrounding weak light areas, and ultimately improves the overall light transmission uniformity and utilization rate of the COB backlight module.

[0065] In the above embodiments, such as Figure 3 As shown, the lampshade also includes a barrier structure 30 and a connecting plate 40. The barrier structure 30 is arranged around the outer periphery of the lampshade 10 and is connected to the first end of the lampshade 10 through the connecting plate 40. In the direction perpendicular to the top of the lampshade 20, the height of the barrier structure 30 is less than the height of the lampshade 10.

[0066] By setting a barrier structure 30 around the cover 10, and ensuring that the height of the barrier structure 30 is less than the height of the cover 10 in the direction perpendicular to the top 20 of the cover, some light can overflow from the top of the barrier structure 30, supplementing the brightness of the area between adjacent lamp covers, thus ensuring uniform brightness of the light-emitting surface of the entire COB backlight module. Simultaneously, the barrier structure 30 is spaced from the cover 10, preventing it from obstructing the normal light emission path of the lamp cover. Furthermore, its height being less than the height of the cover 10 prevents interference with the main light emission direction of the light-emitting chips. This not only improves luminous efficiency but also cuts off the propagation path of lateral light leakage between adjacent light-emitting chips through targeted barrier design, ultimately achieving a balance between high-efficiency light emission and low crosstalk.

[0067] Specifically, when the cover 10 adopts a cuboid or cuboid-like structure with openings at both ends, the barrier structure 30 can be a ring structure, which includes baffles sequentially connected around the perimeter of the cover 10. The baffles are opaque.

[0068] More specifically, such as Figure 4As shown, in the direction perpendicular to the top cover 20, the end face of the barrier structure 30 away from the connecting plate 40 is located between the outer surface of the top cover 20 and the center line of the first through hole 100.

[0069] By setting a barrier structure 30 around the cover 10, and in the direction perpendicular to the top of the cover 20, the height of the barrier structure 30 is greater than the vertical distance from the center line of the first through hole 100 to the end face of the connecting plate 40 that connects to the barrier structure 30, the barrier structure 30 can effectively block the light emitted from the first through hole 100 and prevent it from directly illuminating the light-emitting area of ​​the adjacent light-emitting chip.

[0070] Based on the lampshade provided by this utility model, this utility model also provides a light source reflector, which includes the above-mentioned lampshade.

[0071] Among them, such as Figure 5 As shown, multiple lampshades are arranged in a matrix, and the connecting plates 40 of each lampshade form an integral plate. The part of the barrier structure 30 located between two adjacent lampshades 10 forms a common convex ridge 31.

[0072] Specifically, the connecting plates 40 of each lampshade are not independent, but are formed in one piece through processes such as injection molding and stamping, ultimately forming a complete, seamless large panel. This makes the connecting plate 40 structurally stronger and easier to assemble. When two lampshades are arranged adjacent to each other, the barrier structure 30 that is closest to the other is no longer two independent protrusions, but is merged into a continuous, common protrusion structure through an integral molding process. This barrier structure 30 shared by the two adjacent lampshades is the common ridge 31.

[0073] The common convex ridge 31, as a continuous barrier structure 30, can seamlessly block the side leakage of light from adjacent lampshades. At the same time, its height is equal to that of the lampshade, allowing some light to overflow and fill the brightness gap between the two lampshades, ensuring the overall uniformity of the light-emitting surface of the entire light source reflector and avoiding the appearance of dark lines in rows and columns.

[0074] Based on the light source reflector provided by this utility model, this utility model also provides a COB backlight module, which further includes a COB light source. Wherein, as... Figure 6 As shown, the COB light source includes a lamp board 50 and multiple light-emitting chips 60 disposed on the lamp board. A lamp cover is disposed on each light-emitting chip 60 in a corresponding manner, and the opening of the lamp cover is in contact with the lamp board 50.

[0075] The light panel 50 has a side where the light-emitting chip 60 is disposed, and the area on the light panel 50 where the light-emitting chip 60 is not exposed is coated with a high-reflectivity coating.

[0076] Since the main light-emitting part of the light-emitting chip 60 is its top light-emitting surface, and a small amount of light is also emitted from the sides, most of the light emitted by the light-emitting chip 60 is emitted through the second through-hole 200 on the cover 20; the light reflected by the high-reflectivity coating on the cover 20 and the lamp board 50 can be emitted through the first through-hole 100. The setting of the first through-hole 100 can improve the uniformity of light effect between adjacent light-emitting chips 60 and solve the problems of dark lines and uneven brightness that easily occur at the spacing between adjacent light-emitting chips.

[0077] Specifically, the reflective coating is a white paint layer with a reflectivity greater than 92%; preferably, the reflectivity can be 95%.

[0078] The COB backlight module provided by this utility model can be used in display devices such as central control screens or instrument panels in the field of vehicle display, as well as in display devices such as monitors, computers or televisions in the field of consumer electronics, industrial control screens in the field of industrial control, and medical image displays in the field of medical display.

[0079] Those skilled in the art will understand that, without conflict, the above-mentioned preferred solutions can be freely combined and superimposed.

[0080] It should be understood that the above-described embodiments are merely exemplary and not restrictive. Without departing from the basic principles of this utility model, any obvious or equivalent modifications or substitutions made by those skilled in the art regarding the above details will be included within the scope of the claims of this utility model.

Claims

1. A lampshade for a COB backlight module, characterized in that, The lampshade includes a body and a top; the body is circumferentially closed and open at both ends, with the first end opening forming the opening of the lampshade, and at least a plurality of first through holes are provided in the circumferential direction of the body; the top is a plate-like structure, fixedly connected to the second end opening of the body, and its edge is sealed and enclosed with the edge of the second end opening of the body. The canopy includes a central region and a surrounding region around the central region; The central area of ​​the lampshade is a closed structure, and the peripheral area is provided with multiple second through holes; for visible light rays emitted from inside the lampshade to the outside, the reflectivity of the central area is greater than the transmittance.

2. The lampshade according to claim 1, characterized in that, The cover includes four side walls and four transition walls. Each side wall is a concave curved surface that is recessed inward, and each transition wall is a convex curved surface that is protruding outward. Adjacent side walls are connected by the transition walls. The recess depth of each sidewall is greatest at its central axis parallel to the main axis of the cover; The two sidewalls, which are positioned opposite each other, are mirror-symmetrical about a central plane. The central plane passes through the central axis of the main axis of the cover and is perpendicular to the reference plane of the two oppositely arranged side walls; The central axis of the main axis of the cover is the axis connecting the geometric center of the closed contour of the outer edges of the two openings at the ends of the cover; the reference plane is a virtual plane containing the upper and lower edge contours corresponding to the sidewalls along the main axis of the cover.

3. The lampshade according to claim 2, characterized in that, A plurality of first through holes are distributed circumferentially on each of the sidewalls, and the first through holes are distributed at least at the location of the maximum recess depth. Each of the transition walls is provided with a first through hole, and the opening area of ​​the first through hole on the transition wall is larger than the opening area of ​​the first through hole on the side wall.

4. The lampshade according to claim 2, characterized in that, The multiple second through holes on the top of the cover form multiple through hole groups around the central region, and each through hole group has multiple second through holes arranged radially at intervals along a direction away from the central region.

5. The lampshade according to claim 4, characterized in that, The plurality of through-hole groups include a centerline through-hole group, a diagonal through-hole group, and a side through-hole group. The centerline through-hole group has four groups evenly distributed along the circumference of the central region, and the plurality of second through-holes in each group are respectively arranged along the two centerlines of the top of the cover. The diagonal through-hole group has four groups distributed along the circumference of the central region, and the plurality of second through-holes in each group are respectively arranged along at least the two diagonals of the top of the cover. The number of second through holes in the centerline through hole group is less than the number of second through holes in the diagonal through hole group; Around the circumference of the central region, a side through-hole group is provided on both sides of each of the diagonal through-hole groups; The straight line containing the center of each second through hole in the side through hole group is parallel to the straight line containing the center of each second through hole in the diagonal through hole group; The number of second through holes in the side through hole group is greater than the number of second through holes in the centerline through hole group, but less than the number of second through holes in the diagonal through hole group.

6. The lampshade according to claim 1, characterized in that, It also includes a barrier structure and a connecting plate, wherein the barrier structure is disposed around the outer periphery of the cover and is connected to the first end of the cover through the connecting plate; wherein, in the direction perpendicular to the top of the cover, the height of the barrier structure is less than the height of the cover.

7. The lampshade according to claim 6, characterized in that, In a direction perpendicular to the top of the cover, the end face of the barrier structure away from the connecting plate is located between the outer surface of the top of the cover and the center line of the first through hole.

8. A light source reflector, characterized in that, Includes multiple lampshades as described in any one of claims 1-7.

9. The light source reflector according to claim 8, characterized in that, The lampshade also includes a barrier structure and a connecting plate. The barrier structure is arranged around the outer periphery of the lampshade and is connected to the first end of the lampshade through the connecting plate. In the direction perpendicular to the top of the lampshade, the height of the barrier structure is less than the height of the lampshade. The multiple lampshades are arranged in a matrix, and the connecting plates of each lampshade form an integral plate. The portion of the barrier structure located between two adjacent lampshades forms a common convex ridge.

10. A COB backlight module, characterized in that, Includes a light source reflector and a COB light source as described in any one of claims 8 or 9, wherein the COB light source includes a lamp board and a plurality of light-emitting chips disposed on the lamp board, the lamp cover is disposed on each of the light-emitting chips in a corresponding manner, and the opening of the lamp cover is fitted to the lamp board.

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