Reflector plate for backlight module and backlight module

Abstract

The invention discloses a reflector plate for a backlight module, which is characterized in that the reflector plate comprises a base material, the base material is provided with a reflecting surface for reflecting light, and the reflecting surface is provided with an enclosed peripheral boundary; the functional layer is arranged on the reflecting surface of the base material, and the functional layer comprises fluorescent powder; wherein the functional layer is a discontinuous layer formed by a plurality of functional trace points, the distribution of the functional trace points gradually diffuses inwards from the periphery boundary, and the distribution density of the functional trace points gradually decreases inwards from the periphery boundary. By the adoption of the technical scheme, the edge dark space problem of an existing backlight module can be solved.

Description

Technical Field

[0001] The present invention relates to the field of backlight modules, and in particular to a reflective sheet used for a backlight module and a backlight module. Background Art

[0002] In liquid crystal display devices, the backlight module is a key component that provides a surface light source. As a component of the backlight module, the reflector is typically located at the bottom of the light guide plate or LED light panel. Its primary function is to efficiently reflect light emitted from the light source in a direction away from the display panel, as well as light returning from other optical layers such as the light guide plate, back to the display panel. This improves light utilization efficiency and thus enhances the brightness of the entire display. Traditional reflectors are typically made of materials with high reflectivity, such as a highly reflective coating applied to a PET substrate. The goal is to achieve the highest possible and uniform reflectivity across the entire reflective surface.

[0003] In recent years, as display technology has evolved toward high-definition image quality and high dynamic range (HDR), Mini LED (sub-millimeter light-emitting diode) backlight technology has been widely adopted. Mini LED backlights utilize a large number of tiny LED chips to form an array light source, combined with local dimming technology, to achieve ultra-high contrast and superior brightness.

[0004] However, despite the significant advantages of Mini LED technology, it also places higher demands on the optical components within the backlight module, and existing traditional reflectors are gradually exposing their shortcomings in application. First, because Mini LED chips are discrete point light source arrays, their physical layout itself can lead to uneven light output, especially in the edge areas around the backlight module and in the areas between the lamp beads. The light intensity is relatively weak, which easily forms visually perceptible dark areas and affects the overall uniformity of the picture. Although traditional reflectors have high reflectivity, their reflective characteristics are uniform. They can only passively reflect light and cannot actively compensate for and correct the inherent unevenness of the light source. Therefore, it is difficult to effectively solve the problem of dark areas at the edges. Summary of the Invention

[0005] The purpose of the present invention is to overcome the above-mentioned defects or problems existing in the background technology and provide a reflective sheet for a backlight module and a backlight module, which can improve the edge dark area problem of the existing backlight module.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] Technical Solution 1: A reflective sheet for a backlight module, characterized in that it includes: a substrate, the substrate having a reflective surface for reflecting light, the reflective surface having an enclosed outer boundary; and a functional layer, the functional layer is arranged on the reflective surface of the substrate, and the functional layer includes phosphor; wherein the functional layer is a discontinuous layer composed of a plurality of functional dots, and the distribution of the functional dots gradually diffuses inward from the outer boundary, and the distribution density of the functional dots gradually decreases inward from the outer boundary.

[0008] Technical solution 2 based on technical solution 1: the size of the functional point trace gradually increases starting from the outer boundary.

[0009] Technical solution three based on technical solution one: the reflecting surface has an enclosed distribution boundary; the distribution boundary is located within the outer boundary and its internal area forms a non-functional distribution area, and the area between the distribution boundary and the outer boundary forms a functional distribution area; the functional layer is only provided in the functional distribution area.

[0010] Technical solution 4 based on technical solution 3: the distribution boundary corresponds to the shape of the outer boundary and surrounds the non-functional distribution area in a ring shape.

[0011] Technical solution five based on technical solution four: the substrate is provided with a plurality of through holes or notches located at the edge, and the number of the through holes or notches in the functional distribution area is less than the number in the non-functional distribution area.

[0012] Technical solution 6 based on technical solution 1: the size range of the functional point trace is 0.15 to 0.35 mm.

[0013] Technical solution 7 based on technical solution 1: the thickness of the functional layer is 4 microns to 8 microns.

[0014] Technical Solution 8 based on Technical Solution 1: The functional layer is composed of ink containing fluorescent powder, wherein the weight percentage concentration of the fluorescent powder in the ink is 27% to 48%.

[0015] Technical solution nine based on technical solution one: further comprising an adhesive layer provided on the surface of the substrate facing away from the reflective surface, and a protective film covering the adhesive layer.

[0016] In addition, the present invention also provides technical solution ten: a backlight module, which includes a plurality of light-emitting components, which adopts the reflective sheet for the backlight module described in any one of technical solutions one to nine, and the light-emitting components are arranged on the reflective sheet and exposed from the reflective surface.

[0017] From the above description of the present invention, it can be seen that compared with the prior art, the present invention has the following beneficial effects:

[0018] Technical solution one provides a reflective sheet for a backlight module, which organically combines the three technical features of a substrate, a functional layer containing phosphors, and a specific functional layer structure to jointly solve the problems of low edge brightness and uneven light output of the Mini LED backlight module in the prior art. Among them, the reflective surface of the substrate provides a basic high-reflectivity platform for light. Secondly, the functional layer provided on the reflective surface contains phosphors, thereby introducing the optical principle of photoluminescence as the basis for light compensation. Phosphors can absorb a portion of the short-wavelength light (such as blue light) from the LED light source and convert it into light with a longer wavelength (such as yellow-green light) for emission. This converted light is mixed with the original blue light directly reflected by the substrate, which can increase the total luminous flux in the local area.

[0019] Furthermore, a key design of this solution is to construct the functional layer as a discontinuous layer composed of multiple functional dots, rather than a completely covered continuous coating layer. This technical means is the structural basis for achieving all subsequent gradient control effects, and brings decisive beneficial effects. If a continuous layer is used, the optical properties of the functional layer (such as light conversion efficiency) are uniform on a macro scale, and it is difficult to achieve differentiated compensation for different areas. By adopting discontinuous functional dots, the optical properties can be precisely spatially modulated on a micro scale. In the gap area between the functional dots, the reflective surface of the substrate is directly exposed, retaining its original high reflective properties, ensuring that light can be directly reflected. In the area where the functional dots are located, fluorescence conversion occurs. This structure makes the light output from each tiny area a mixture of directly reflected light and fluorescent converted light.

[0020] Based on this structure, the core innovation of this solution is achieved: the distribution density of these functional dots gradually decreases from the outer edge of the reflector inward. Precisely because the functional layer is a discontinuous pattern, the physical quantity of "distribution density" becomes a controllable variable. By varying the number of functional dots per unit area, the total amount of fluorescence conversion within a local area can be smoothly and precisely controlled. Physically, the light intensity of the light field formed by a Mini LED light source array naturally decays from the center to the surrounding edges, reaching its lowest intensity at the outermost boundaries. This is the direct cause of the edge darkening problem in the prior art. The density gradient design of this solution precisely targets and compensates for this physical phenomenon. The density of functional dots is highest at the outer edges, where the light intensity is lowest, resulting in the greatest light conversion in this area and providing the strongest brightness compensation. As the light intensity increases toward the inner side of the reflective surface (toward the center), the direct light intensity from the LED light source gradually increases, reducing the need for additional compensation. At this point, the density of functional dots also gradually decreases, lowering the proportion of light conversion. This gradual transition from a mixture of substrate reflection and strong fluorescence conversion to substrate reflection as the main factor and weak fluorescence conversion as the auxiliary factor transforms the entire reflective surface from a passive, uniform reflective device to an active optical element that can actively and differentially spatially modulate the light field.

[0021] Therefore, this technical solution forms a complete and targeted brightness compensation system through the close coupling and synergy of multiple technical means such as substrate reflection, phosphor conversion, discontinuous dot structure, and density gradient distribution that is precisely inversely correlated with the light field intensity. It is not a simple superposition of various features, but rather a system that can effectively improve the dark area at the edge of the backlight module and enhance the overall uniformity of the light output.

[0022] Technical Solution 2 further specifies that the size of the functional traces gradually increases inward from the outer boundary. This technical approach forms an inversely oriented control mechanism with the density gradient distribution of the functional traces described above. The two work synergistically to provide a more complex and precise shaping capability for the spatial distribution of light conversion intensity. The goal is to achieve a nonlinear compensation curve by combining two variables to match the inherent, and typically nonlinear, brightness decay curve of the backlight module. Specifically, the total amount of fluorescence conversion within a local area depends on both the density of the functional traces and the size of the individual functional traces. At the outermost boundary, while the trace density is highest, the light conversion capacity of the individual traces is weak due to their smallest size. This creates a relatively gentle starting point for compensation, helping to avoid abrupt, overly bright lines at the very edge and achieving smooth integration with the dark areas. As the trace density decreases toward the inner side, its size increases. Because the light conversion capacity of a single trace is positively correlated with its area, the effect of increasing size is particularly significant. This combination of increasing size and decreasing density allows the overall light conversion intensity to be designed with a profile that first increases and then decreases. This means that the compensation intensity peaks at a specific location near the edge, corresponding to the area where the human eye is most sensitive or where physical light intensity attenuation is most dramatic, and then gradually decreases as it approaches the center area where light intensity is abundant. Therefore, this design goes beyond simple monotonic compensation. Instead, by coupling two variables with opposite gradients, it achieves precise shaping of the compensation intensity profile curve. This allows for a more realistic and natural elimination of complex edge dark areas and uneven brightness, achieving visual uniformity far exceeding that of a single gradient compensation solution.

[0023] In technical solution three, the reflective surface is clearly divided into "functional distribution areas" and "non-functional distribution areas", and the functional layer is only set in the functional distribution areas. By precisely applying the functional layer with compensation function to the edge and transition areas (i.e., functional distribution areas) where the brightness improvement is most needed, and not setting the functional layer for the central area (i.e., non-functional distribution areas) where the light intensity itself is sufficient and the uniformity is good, its original high reflective properties are retained. This design ensures that the effect of optical compensation is maximized in the problem area, avoiding problems such as color deviation that may be caused by unnecessary global intervention. In addition, the cost of phosphors, especially high-performance phosphor materials, is relatively high. This solution only uses phosphors in necessary areas, which greatly reduces the consumption of expensive materials, thereby effectively controlling the manufacturing cost of the entire reflector.

[0024] Technical Solution 4 further defines the functional distribution area as a ring-shaped area corresponding to the outer boundary, suitable for common rectangular display panels. This ring-shaped distribution pattern geometrically corresponds to the dark edge area around the display panel, ensuring precise alignment of the optical compensation area with the problem area.

[0025] In Technical Solution 5, it is stipulated that the through holes or notches on the substrate used to install light-emitting components and other devices are mainly located in the non-functional distribution area, ensuring that the integrity of the precision optical compensation area formed by the functional layer is not destroyed. At the same time, it ensures that the light-emitting components can be installed in the central position where they are most needed to provide high light intensity, so that the optical design and physical structure design complement each other and jointly serve the ultimate goal of improving the overall light output efficiency and uniformity.

[0026] In technical solution six, the size range of 0.15 to 0.35 mm ensures that the functional dots are invisible at the macro level, thereby ensuring smooth light output, while at the micro level it is sufficient to be stably achieved through mature processes such as screen printing.

[0027] In technical solutions seven and eight, the thickness of 4 to 8 microns and the concentration of 27% to 48% are to ensure that the phosphor layer can provide sufficient light conversion efficiency without causing negative effects such as excessive absorption, increased costs or color shift due to excessive thickness or high concentration.

[0028] Technical Solution 9 adds an adhesive layer and a protective film. The adhesive layer allows the reflector to be easily and securely attached to other components of the backlight unit (such as the light board or chassis), simplifying the assembly process. The protective film effectively protects the reflective surface containing the precise functional points from scratches, contamination, or damage during transportation, storage, and assembly, ensuring the optical performance and reliability of the final product.

[0029] In technical solution ten, a backlight module is provided. By integrating the above-mentioned reflective sheet, the backlight module can achieve higher uniformity of light output brightness, effectively eliminate the dark area at the edge of the picture, and thus improve the overall display quality of the terminal display device used. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0031] Figure 1 Schematic diagram of the structure of a reflective sheet for a backlight module according to an embodiment of the present invention;

[0032] Figure 2 for Figure 1 Schematic cross-section of the reflector.

[0033] Description of main reference numerals:

[0034] Substrate 10; reflective surface 11; peripheral boundary 12; functional layer 13; functional point trace 14; distribution boundary 15; non-functional distribution area 16; functional distribution area 17; through hole 18; notch 19;

[0035] Adhesive layer 21; Protective film 22. DETAILED DESCRIPTION

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are preferred embodiments of the present invention and should not be regarded as excluding other embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0037] In the claims, description and drawings of the present invention, unless otherwise clearly defined, the use of terms such as "first", "second" or "third" is for the purpose of distinguishing different objects rather than for describing a specific order.

[0038] In the claims, specification and the above-mentioned drawings of the present invention, unless otherwise expressly defined, directional words such as the terms "center", "transverse", "longitudinal", "horizontal", "vertical", "top", "bottom", "inside", "outside", "up", "down", "front", "back", "left", "right", "clockwise", "counterclockwise" and the like indicating directions or positional relationships are based on the directions and positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the specific scope of protection of the present invention.

[0039] In the claims, description and above-mentioned drawings of the present invention, unless otherwise expressly defined, the terms "fixed connection" or "fixed connection" should be understood in a broad sense, that is, any connection method without displacement relationship and relative rotation relationship between the two parties, that is, including non-detachable fixed connection, detachable fixed connection, integral connection and fixed connection through other devices or elements.

[0040] In the claims, description and drawings of the present invention, if the terms "include", "have" and their variations are used, they are intended to mean "including but not limited to".

[0041] Example 1

[0042] The first embodiment of the present invention relates to a reflective sheet for a backlight module, wherein the backlight module may be

[0043] Reference Figure 1 and Figure 2The reflective sheet involved in this embodiment mainly includes a substrate 10 , a functional layer 13 , an adhesive layer 21 and a protective film 22 .

[0044] The substrate 10 has a reflective surface 11 for reflecting light, and the reflective surface 11 has an enclosed outer boundary 12; the functional layer 13 is provided on the reflective surface 11 of the substrate 10, and the functional layer 13 includes phosphor; wherein the functional layer 13 is a discontinuous layer composed of a plurality of functional dots 14, and the distribution of the functional dots 14 gradually diffuses inward from the outer boundary 12, and the distribution density of the functional dots 14 gradually decreases inward from the outer boundary 12.

[0045] Specifically, the substrate 10 can be made of a polyethylene terephthalate (PET) film with high reflectivity, for example, a specific type of reflective material with a thickness of 0.15 mm and a white coating with high diffuse reflectivity on the surface, serving as the reflective surface 11. The functional layer 13 is formed on the reflective surface 11 by a screen printing process. The process uses a pre-designed screen template, and the positions on the template corresponding to the functional dots 14 to be printed are hollow meshes, and the rest are blocked. During printing, ink containing fluorescent powder is applied to the template, and the pressure of the scraper causes the ink to pass through the mesh and adhere to the reflective surface 11 of the substrate 10, thereby forming a non-continuous layer composed of multiple independent functional dots 14. In order to achieve a gradient distribution in which the density gradually decreases from the outer boundary 12 to the inside, the mesh arrangement on the screen template near the outer boundary 12 is the densest, and the mesh spacing gradually increases when transitioning to the inner area. In this embodiment, referring to Figure 1 The reflective surface 11 on the substrate 10 completely covers one side surface of the substrate 10 , and the boundary of the substrate 10 is the enclosed boundary of the reflective surface 11 .

[0046] The adhesive layer 21 is disposed on the surface of the substrate 10 facing away from the reflective surface 11, and the protective film 22 covers the adhesive layer 21. Specifically, the adhesive layer 21 can be a layer of pressure-sensitive adhesive (PSA) with a thickness of, for example, 0.05 mm, used to adhere and secure the entire reflector to the light board or base plate of the backlight module. The protective film 22 can be a release film, such as a 0.075 mm thick PET or PE film with a low-adhesion surface. This protects the adhesive layer 21 from being dirty and sticky before assembly, and allows for easy removal during assembly.

[0047] Among them, the reflecting surface 11 has an enclosed distribution boundary 15; the distribution boundary 15 is located within the outer boundary 12 and its internal area forms a non-functional distribution area 1716, and the area between the distribution boundary 15 and the outer boundary 12 forms a functional distribution area 17; the functional layer 13 is only provided in the functional distribution area 17. Specifically, this partition is achieved through the design of a screen printing template. On the template, only the area corresponding to the functional distribution area 17 is designed as a mesh pattern that is permeable to ink, while the area corresponding to the non-functional distribution area 1716 is completely blocked and no mesh is formed. Therefore, when printing is completed, the functional dots 14 only appear in the functional distribution area 17, forming a clear functional partition. The distribution boundary 15 is the outline formed by the innermost community of functional dots 14 in the functional distribution area 17.

[0048] Furthermore, the distribution boundary 15 corresponds to the shape of the peripheral boundary 12 and surrounds the non-functional distribution area 1716 in a ring shape. Figure 1 For a rectangular reflector, its outer boundary 12 is the outer rectangular outline. Its distribution boundary 15 is correspondingly a smaller inner rectangular outline approximately concentric with the outer boundary 12. Thus, the functional distribution area 17 forms a rectangular frame or annulus surrounding the central non-functional distribution area 1716. This structure allows optical compensation to be precisely applied to the edges surrounding the display screen.

[0049] Among them, the substrate 10 is provided with a plurality of through holes 18 or notches 19 located at the edge, and the number of the through holes 18 or notches 19 in the functional distribution area 17 is less than the number in the non-functional distribution area 1716. Specifically, the through holes 18 and notches 19 are formed in one go through a high-precision punching process after the screen printing process is completed. The material of the punching mold can be SK-5 tool steel. The through holes 18 are mainly used for positioning or passing through the Mini LED light-emitting chip, and its position precisely corresponds to the LED layout on the lamp board. Therefore, most of the through holes 18 are located in the non-functional distribution area 1716 where the lamp beads are densely packed. The notches 19 at the edge are mostly used for the alignment and installation of the entire reflector with other components (such as the frame).

[0050] Preferably, the size of the functional traces 14 gradually increases from the outer boundary 12. Specifically, this size gradient is also achieved through the design of the screen printing template. The mesh diameter of the template corresponding to the outer boundary 12 is the smallest, for example, 0.15 mm. As it transitions toward the inner distribution boundary 15, the mesh diameter is designed to gradually increase, reaching a maximum of 0.35 mm. This design ensures that the size of the individual functional traces 14 deposited on the substrate 10 also exhibits a corresponding gradual change from small to large during the printing process.

[0051] In addition, the thickness of the functional layer 13 is 4 to 8 microns. The functional layer 13 is composed of ink containing phosphor, wherein the weight percentage concentration of the phosphor in the ink is 27% to 48%. Specifically, the thickness of the functional layer 13 can be controlled at 6 microns, with a tolerance of ±2 microns. This thickness is determined by multiple parameters of screen printing, including the mesh thickness of the screen template, the thickness of the photosensitive resin, the pressure and speed of the scraper, and the viscosity of the ink. The ink is mixed with phosphor, optical solvent and resin binder in a predetermined proportion. The phosphor can be one or more materials that can absorb blue light and emit yellow light, green light or red light, such as yttrium aluminum garnet (YAG)-based phosphor or nitride-based phosphor. Its weight percentage concentration in the ink can be, for example, selected to be 30% or 45%, and the specific value is adjusted according to the specific requirements of the backlight module for color temperature, color rendering index and brightness compensation.

[0052] The reflective sheet for the backlight module involved in this embodiment organically combines three technical features: a substrate 10, a functional layer 13 containing phosphor, and a specific structure of the functional layer 13, to jointly solve the problems of low edge brightness and uneven light output of the Mini LED backlight module in the prior art.

[0053] Example 2

[0054] The second embodiment relates to a backlight module, which includes a plurality of light-emitting components and adopts the reflective sheet for the backlight module described in the first embodiment. The light-emitting components are arranged on the reflective sheet and exposed from the reflective surface 11 .

[0055] Specifically, the backlight module described in this embodiment can be a Mini LED direct-lit backlight module, which structurally includes a bottom housing, a light board fixed within the bottom housing, the reflective sheet described in Example 1, and at least one optical film disposed above the reflective sheet. The light-emitting components are multiple Mini LED chips arranged on the light board.

[0056] The light board can be a printed circuit board (PCB). For example, a metal core printed circuit board (MCPCB) can be used for better heat dissipation. Multiple Mini LED chips are soldered to the light board in an array using surface mount technology (SMT), forming a surface light source array.

[0057] The reflector sheet described in Example 1 is directly attached to the light board via the adhesive layer 21 on its back. During the mounting operation, the protective film 22 on the back of the reflector sheet is first removed. Then, the reflector sheet and the light board are precisely aligned using the alignment holes or edge features, ensuring that each through-hole 18 on the reflector sheet corresponds to a Mini LED light-emitting component on the light board. After lamination, all light-emitting components can pass through the through-holes 18 and emerge from the reflective surface 11 of the reflector sheet. Their light-emitting surfaces can be roughly flush with the reflective surface 11, or slightly protrude from the reflective surface 11 depending on the optical design requirements.

[0058] The optical film is stacked above the reflective sheet, with a preset light mixing distance between the two. The optical film assembly may include, but is not limited to, a diffuser and at least one prismatic film. The diffuser is positioned closest to the reflective sheet and is used to fully mix the direct light from the various light-emitting components with the light reflected and converted by the reflective sheet, eliminating bright spots and creating a uniform light field. The prismatic film is positioned above the diffuser to concentrate the homogenized light perpendicular to the display panel, thereby increasing the frontal brightness of the display.

[0059] When the backlight module is powered on, the light-emitting components on the light panel emit light. Some of this light is directed upward toward the diffuser and other optical films, while another portion is directed in all directions or toward the reflective surface 11 of the reflector. This portion of light is efficiently reflected directly from the non-functional distribution area 1716 of the reflector. In the functional distribution area 17, the light interacts with the functional dots 14, with some being directly reflected from the substrate 10 surface and some being absorbed by the phosphors in the functional dots 14 and converted to a different color before being emitted.

[0060] The above description and embodiments are intended to explain the scope of protection of the present invention, but do not constitute a limitation thereto. Modifications, equivalent substitutions, or other improvements to the embodiments of the present invention or portions thereof that can be obtained by a person of ordinary skill in the art through logical analysis, reasoning, or limited experimentation based on the teachings of the present invention or the above embodiments, combined with common knowledge, ordinary technical knowledge in the field, and / or prior art, should all be included within the scope of protection of the present invention.

Claims

1. A reflective sheet for a backlight module, characterized in that: include: A substrate (10), the substrate (10) having a reflective surface (11) for reflecting light, the reflective surface (11) having an enclosed peripheral boundary (12); and A functional layer (13), the functional layer (13) being provided on the reflective surface (11) of the substrate (10), and the functional layer (13) comprising phosphor; The functional layer (13) is a discontinuous layer composed of a plurality of functional traces (14), and the distribution of the functional traces (14) gradually diffuses inward from the outer boundary (12), and the distribution density of the functional traces (14) gradually decreases inward from the outer boundary (12).

2. The reflective sheet for a backlight module according to claim 1, wherein: The size of the functional trace (14) gradually increases starting from the outer boundary (12).

3. The reflective sheet for a backlight module according to claim 1, wherein: The reflecting surface (11) has an enclosed distribution boundary (15); the distribution boundary (15) is located within the peripheral boundary (12) and its inner area forms a non-functional distribution area (17) (16), and the area between the distribution boundary (15) and the peripheral boundary (12) forms a functional distribution area (17); the functional layer (13) is only provided in the functional distribution area (17).

4. The reflective sheet for a backlight module according to claim 3, wherein: The distribution boundary (15) corresponds to the shape of the peripheral boundary (12) and surrounds the non-functional distribution area (17) (16) in a ring shape.

5. The reflective sheet for a backlight module according to claim 4, wherein: The substrate (10) is provided with a plurality of through holes (18) or notches (19) located at the edge, and the number of the through holes (18) or notches (19) in the functional distribution area (17) is less than the number in the non-functional distribution area (17) (16).

6. The reflective sheet for a backlight module according to claim 1, wherein: The size of the functional trace (14) ranges from 0.15 to 0.35 mm.

7. The pessimistic cat reflector according to claim 1, characterized in that: The thickness of the functional layer (13) is 4 to 8 microns.

8. The reflective sheet for a backlight module according to claim 1, wherein: The functional layer (13) is composed of ink containing fluorescent powder, wherein the weight percentage concentration of the fluorescent powder in the ink is 27% to 48%.

9. The reflective sheet for a backlight module according to claim 1, wherein: It also includes an adhesive layer (21) arranged on the surface of the substrate (10) facing away from the reflective surface (11), and a protective film (22) covering the adhesive layer (21).

10. A backlight module comprising a plurality of light-emitting elements, characterized in that: The reflective sheet for a backlight module comprises the reflective sheet according to any one of claims 1 to 9, wherein the light-emitting element is arranged on the reflective sheet and exposed from the reflective surface (11).

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