A reflective sheet for a backlight module, a backlight module

Abstract

The utility model discloses a kind of reflector for backlight module, it is characterized by, comprising: substrate, the substrate has the reflecting surface for reflecting light, the reflecting surface has enclosed peripheral boundary;And functional layer, the functional layer is located in the reflecting surface of the substrate, and the functional layer includes fluorescent powder;Wherein, the functional layer is the non-continuous layer formed by multiple functional points, and the distribution of the functional point is gradually diffused from the peripheral boundary start inwards, the distribution density of the functional point is gradually reduced from the peripheral boundary start inwards. Using the above technical solution, the edge dark area problem of existing backlight module can be improved.

Description

Technical Field

[0001] This utility model relates to the field of backlight modules, specifically to a reflective sheet for a backlight module and a backlight module. Background Technology

[0002] In LCD displays, the backlight module is a key component providing a surface light source. The reflector, as part of the backlight module, is typically located at the bottom of the light guide plate or LED panel. Its main function is to efficiently reflect light emitted from the light source and propagating away from the display panel, as well as light returning from the light guide plate and other optical films, back to the display panel. This improves light utilization efficiency and thus enhances the overall brightness of the displayed image. Traditional reflectors are usually made of materials with high reflectivity, such as a high-reflectivity coating on a PET substrate. The goal is to achieve the highest possible and most uniform reflectivity across the entire reflective surface.

[0003] In recent years, as display technology has developed towards higher image quality and higher dynamic range (HDR), Mini LED (submillimeter-sized light-emitting diode) backlighting technology has been widely used. Mini LED backlighting uses a large number of tiny LED chips to form an array of light sources, combined with local dimming technology, to achieve ultra-high contrast and better brightness performance.

[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 reflective sheets are gradually revealing their shortcomings in application. Firstly, because Mini LED chips are discrete point light source arrays, their physical layout inherently leads to uneven light output, especially in the peripheral areas of the backlight module and the areas between LED chips, where the light intensity is relatively weak, easily forming visually perceptible dark areas and affecting the overall uniformity of the image. While traditional reflective sheets have high reflectivity, their reflection characteristics are uniform; they can only passively reflect light and cannot actively compensate for or correct the inherent unevenness of the light source, thus making it difficult to effectively solve the problem of dark areas at the edges. Utility Model Content

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

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] Technical Solution 1: A reflective sheet for a backlight module, characterized in that it comprises: a substrate having a reflective surface for reflecting light, the reflective surface having an enclosing outer boundary; and a functional layer disposed on the reflective surface of the substrate, the functional layer comprising phosphor; wherein the functional layer is a discontinuous layer composed of multiple 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 from the outer boundary.

[0009] Technical Solution 3 based on Technical Solution 1: The reflective surface has an enclosing distribution boundary; the distribution boundary is located within the outer boundary and its internal region forms a non-functional distribution region, and the region between the distribution boundary and the outer boundary forms a functional distribution region; the functional layer is only located in the functional distribution region.

[0010] Technical Solution 4 based on Technical Solution 3: The shape of the distribution boundary corresponds to that of the outer boundary and forms a ring around the non-functional distribution area.

[0011] Technical Solution 5 based on Technical Solution 4: The substrate is provided with a plurality of through holes or notches located at the edge, and the number of through holes or notches in the functional distribution area is less than the number in the non-functional distribution area.

[0012] Technical Solution Six based on Technical Solution One: The size range of the functional dot trace is 0.15 to 0.35 mm.

[0013] Technical solution seven based on technical solution one: The thickness of the functional layer is 4 micrometers to 8 micrometers.

[0014] Technical solution eight based on technical solution one: The functional layer is composed of ink containing phosphor, wherein the phosphor in the ink has a weight percentage concentration of 27% to 48%.

[0015] Technical solution nine, based on technical solution one, further includes an adhesive layer disposed on the surface of the substrate opposite to the reflective surface, and a protective film covering the adhesive layer.

[0016] In addition, this utility model also provides technical solution ten: a backlight module, which includes a plurality of light-emitting elements, which adopts the reflective sheet for backlight modules as described in any one of technical solutions one to nine, wherein the light-emitting elements are arranged on the reflective sheet and exposed by the reflective surface.

[0017] As can be seen from the above description of this utility model, compared with the prior art, this utility model has the following beneficial effects:

[0018] Technical Solution 1 provides a reflective sheet for a backlight module. By organically combining three technical features—a substrate, a functional layer containing phosphor, and a specific functional layer structure—it addresses the problems of low edge brightness and uneven light emission in existing Mini LED backlight modules. The reflective surface of the substrate provides a high-reflectivity platform for light. Secondly, the functional layer on this reflective surface contains phosphor, thus introducing the optical principle of photoluminescence as the basis for light compensation. The phosphor can absorb a portion of the short-wavelength light (such as blue light) from the LED light source and convert it into longer-wavelength light (such as yellow-green light) for emission. This converted light mixes with the original blue light directly reflected from the substrate, increasing the total luminous flux in a localized area.

[0019] Furthermore, a key design element of this scheme lies in constructing the functional layer as a discontinuous layer composed of multiple functional dots, rather than a single, continuous coating. This technique forms the structural basis for achieving all subsequent gradient modulation effects and yields decisive beneficial results. With a continuous layer, the optical properties of the functional layer (such as light conversion efficiency) are macroscopically uniform, making it difficult to achieve differentiated compensation for different regions. However, by using discontinuous functional dots, precise spatial modulation of optical properties can be achieved at the microscale. In the gaps between the functional dots, the reflective surface of the substrate is directly exposed, preserving its original high reflectivity and ensuring direct light reflection. In the regions where the functional dots are located, fluorescence conversion occurs. This structure ensures that the light emitted from each tiny region is a mixture of directly reflected light and fluorescence-converted light.

[0020] Based on this structure, the core innovation of this solution is achieved by specifying that the distribution density of these functional dots gradually decreases from the outer boundary of the reflector inwards. It is precisely because the functional layer consists of discontinuous dots that the physical quantity of "distribution density" becomes a controllable variable. By changing the number of functional dots per unit area, the total amount of fluorescence conversion in a local area can be smoothly and precisely controlled. Physically, the light field formed by the Mini LED light source array naturally attenuates from the central region to the surrounding edges, with the lowest light intensity at the outermost boundary. This is the direct cause of the edge dark area problem in the prior art. The density gradient design of this solution precisely targets and compensates for this physical phenomenon. At the outermost boundary where the light intensity is weakest, the density of functional dots is the highest, resulting in the maximum light conversion in this region and thus providing the strongest brightness compensation. As the transition towards the inner side of the reflector (center direction) increases, the direct illumination intensity from the LED light source gradually increases, and the need for additional compensation decreases accordingly. At this point, the density of functional dots also gradually decreases, reducing the proportion of light conversion. This gradual transition from a mixture of substrate reflection and strong fluorescence conversion to a system dominated by substrate reflection and supplemented by weak fluorescence conversion transforms the entire reflective surface from a passive, uniform reflective device into an active optical element capable of actively and differentially modulating the light field spatially.

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

[0022] In technical solution two, the size of the functional dots is further defined as gradually increasing from the outer boundary inwards. This technique, together with the density gradient distribution of the functional dots, forms a control mechanism in the opposite direction. The two work synergistically to provide a more complex and precise shaping capability for the spatial distribution of light conversion intensity. The aim is to achieve a non-linear compensation curve through the combination of two variables to match the inherent, and typically non-linear, brightness decay curve of the backlight module. Specifically, the total amount of fluorescence conversion in a local area depends on both the density of the functional dots and the size of each individual dot. At the outermost boundary, although the dot density is highest, the light conversion capability of each dot is weak due to its smallest size. This forms a relatively gentle compensation starting point, helping to avoid overly bright, abrupt lines at the outermost edge and achieving smooth integration with the dark area. As the transition inwards, the dot density decreases, but its size increases. Because the light conversion capability of a single dot is positively correlated with its area, the effect of increasing size is very significant. This combination of increasing size and decreasing density allows the overall light conversion intensity to be designed as a profile curve that first increases and then decreases. This means that the compensation intensity can peak at a specific location near the edge, precisely corresponding to the area where the human eye is most sensitive or where physical light intensity attenuates most drastically, and then gradually decreases as it moves closer to the well-lit center. Therefore, this design is no longer a simple monotonic compensation, but rather achieves precise shaping of the compensation intensity profile curve through the coupling of two variables with opposite gradients. This allows for a more realistic and natural elimination of various complex edge dark areas and brightness unevenness issues, resulting in visual uniformity far exceeding that of single-gradient compensation schemes.

[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 placed in the functional distribution areas. By precisely applying the functional layer with compensation function to the edges and transition areas where brightness enhancement is most needed (i.e., the functional distribution areas), while leaving the functional layer untouched in the central areas where the light intensity is already sufficient and the uniformity is good (i.e., the non-functional distribution areas), the original high reflectivity is preserved. This design ensures that the optical compensation effect is maximized in the problem areas, avoiding color shift and other problems that may result from unnecessary global intervention. Furthermore, phosphors, especially high-performance phosphors, are expensive. This solution uses phosphors only in necessary areas, significantly reducing the consumption of expensive materials and effectively controlling the overall manufacturing cost of the reflective sheet.

[0024] In technical solution four, the shape of the functional distribution area is further defined as ring-shaped, corresponding to the shape of the outer boundary, which is suitable for common rectangular display panels. The ring-shaped distribution corresponds geometrically to the dark area at the edge of the display panel, ensuring precise overlap between the optical compensation area and the problem area.

[0025] In technical solution five, the through holes or notches on the substrate used for mounting light-emitting components and other devices are mainly located in the non-functional distribution area, which ensures that the integrity of the precision optical compensation area formed by the functional layer is not damaged. At the same time, it ensures that the light-emitting components can be installed in the center position where they are most needed to provide high light intensity, so that the optical design and physical structure design complement each other and work together to improve 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 not visible on a macroscopic scale, thus guaranteeing the smoothness of light emission, while at the same time being sufficient to be stably achieved on a microscopic scale through mature processes such as screen printing.

[0027] In technical solutions seven and eight, the thickness of 4 to 8 micrometers 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 cost, or color shift due to excessive thickness or high concentration.

[0028] In technical solution nine, an adhesive layer and a protective film are added. The adhesive layer allows the reflector to be easily and firmly attached to other components of the backlight module (such as the lamp board or chassis), simplifying the assembly process; while the protective film effectively protects the reflective surface containing precision functional dots 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 aforementioned reflective sheet, the backlight module can achieve higher uniformity of light output brightness, effectively eliminating dark areas at the edges of the image, thereby improving the overall display quality of the terminal display device. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

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

[0032] Figure 2 for Figure 1 A schematic diagram of the cross-section of the reflector.

[0033] Explanation of key figure labels:

[0034] 10. Substrate; 11. Reflective surface; 12. Peripheral boundary; 13. Functional layer; 14. Functional dots; 15. Distribution boundary; 16. Non-functional distribution area; 17. Functional distribution area; 18. Through hole; 19. Notch;

[0035] Adhesive layer 21; protective film 22. Detailed Implementation

[0036] 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 preferred embodiments of the present utility model and should not be considered as excluding other embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0037] Unless otherwise expressly defined, the use of terms such as "first," "second," or "third" in the claims, description, and drawings of this utility model is for distinguishing different objects and not for describing a specific order.

[0038] Unless otherwise expressly defined, in the claims, description, and accompanying drawings of this utility model, the use of directional terms such as "center," "lateral," "longitudinal," "horizontal," "vertical," "top," "bottom," "inner," "outer," "upper," "lower," "front," "rear," "left," "right," "clockwise," and "counterclockwise" to indicate orientation or positional relationships is based on the orientation and positional relationships shown in the accompanying drawings and is only for the convenience of describing this utility model and simplifying the description. It does not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the specific protection scope of this utility model.

[0039] Unless otherwise expressly defined, the terms "fixed connection" or "fixed connection" used in the claims, description and drawings of this utility model shall be interpreted broadly to refer to any connection in which there is no displacement or relative rotation relationship between the two parties, including non-removable fixed connection, detachable fixed connection, integral connection and fixed connection through other devices or components.

[0040] In the claims, description and accompanying drawings of this utility model, the terms "comprising", "having", and variations thereof are used to mean "including but not limited to".

[0041] Example 1

[0042] Embodiment 1 of this utility model relates to a reflective sheet for a backlight module, wherein the backlight module can be...

[0043] Reference Figure 1 and Figure 2 The 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 enclosing outer boundary 12; the functional layer 13 is disposed 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 a polyethylene terephthalate (PET) film with high reflectivity, for example, using a specific type of reflective material with a thickness of 0.15 mm and a white coating with high diffuse reflectivity, serving as the reflective surface 11. The functional layer 13 is formed on the reflective surface 11 by screen printing. This process uses a pre-designed screen template, with perforated mesh openings corresponding to the positions where the functional dots 14 need to be printed, while the remaining areas are sealed. During printing, ink containing fluorescent powder is applied to the template, and the pressure of a squeegee forces the ink through the mesh openings onto the reflective surface 11 of the substrate 10, thereby forming a discontinuous layer composed of multiple independent functional dots 14. To achieve a gradient distribution where the density gradually decreases from the outer boundary 12 inwards, the mesh openings are most densely arranged in the area near the outer boundary 12 of the screen template, while the spacing between the mesh openings gradually increases as the area transitions inwards. In this embodiment, refer 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 enclosing 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 pressure-sensitive adhesive (PSA) with a thickness of, for example, 0.05 mm, used to adhere and fix the entire reflective sheet to the lamp 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 low adhesion, used to protect the cleanliness and stickiness of the adhesive layer 21 before assembly, and can be easily removed during assembly.

[0047] The reflective surface 11 has an enclosing distribution boundary 15. The distribution boundary 15 is located within the outer boundary 12, and its internal region forms a non-functional distribution region 1716. The region between the distribution boundary 15 and the outer boundary 12 forms a functional distribution region 17. The functional layer 13 is only located within the functional distribution region 17. Specifically, this partitioning is achieved through a screen printing template design. On the template, only the area corresponding to the functional distribution region 17 is designed with a permeable mesh pattern, while the area corresponding to the non-functional distribution region 1716 is completely blocked, without forming any mesh. Therefore, after printing, the functional dots 14 only appear in the functional distribution region 17, forming a clear functional partition. The distribution boundary 15 is the outline formed by the innermost cluster of functional dots 14 within the functional distribution region 17.

[0048] Furthermore, the distribution boundary 15 corresponds in shape to the outer boundary 12 and forms a ring around the non-functional distribution area 1716. Specifically, refer to... Figure 1 For a rectangular reflective sheet, its outer boundary 12 is an 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 ring surrounding the central non-functional distribution area 1716. This structure allows optical compensation capabilities to be precisely applied to the edges of the display screen.

[0049] The substrate 10 has several through holes 18 or notches 19 located at the edges. The number of 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 step by a high-precision punching process after the screen printing process. The punching die can be made of SK-5 tool steel. The through holes 18 are mainly used for positioning or passing through Mini LED light-emitting chips, and their positions correspond precisely to the LED layout on the light board. Therefore, most of the through holes 18 are located in the densely populated non-functional distribution area 1716 of LED chips. The notches 19 located at the edges 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 dots 14 gradually increases from the outer boundary 12. Specifically, this size gradient is also achieved through the design of the screen printing stencil. The mesh diameter on the stencil corresponding to the outer boundary 12 region is the smallest, for example, 0.15 mm; while as it transitions towards the inner distribution boundary 15, the mesh diameter is designed to gradually increase, reaching a maximum of 0.35 mm. This design ensures that during the printing process, the size of the individual functional dots 14 deposited on the substrate 10 also exhibits a gradual change from small to large.

[0051] Furthermore, the thickness of the functional layer 13 is 4 to 8 micrometers. The functional layer 13 is composed of an ink containing phosphor, wherein the phosphor's weight percentage concentration in the ink is 27% to 48%. Specifically, the thickness of the functional layer 13 can be controlled, for example, at 6 micrometers, with a tolerance of ±2 micrometers. This thickness is determined by several parameters of screen printing, including the mesh thickness of the screen stencil, the thickness of the photosensitive emulsion, the pressure and speed of the squeegee, and the viscosity of the ink. The ink is composed of phosphor, optical solvent, and resin binder mixed in a predetermined ratio. The phosphor can be one or more materials capable of absorbing blue light and emitting yellow, green, 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 as 30% or 45%, with the specific value 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: substrate 10, functional layer 13 containing phosphor, and specific structure of functional layer 13, to jointly solve the problems of low edge brightness and uneven light output in the Mini LED backlight module in the prior art.

[0053] Example 2

[0054] Embodiment 2 relates to a backlight module, which includes a plurality of light-emitting elements and uses the reflective sheet for backlight modules described in Embodiment 1. The light-emitting elements are arranged on the reflective sheet and exposed by the reflective surface 11.

[0055] Specifically, the backlight module described in this embodiment can be a MiniLED direct-lit backlight module, which structurally includes a base shell, a lamp board fixed inside the base shell, a reflector sheet as described in Embodiment 1, and at least one optical film disposed above the reflector sheet. The light-emitting element is a plurality of Mini LED chips arranged on the lamp board.

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

[0057] The reflector sheet described in Embodiment 1 is directly attached to the lamp board via the adhesive layer 21 on its back. During the mounting process, the protective film 22 on the back of the reflector sheet is first removed. Then, the reflector sheet is precisely aligned with the lamp board using alignment holes or edge features, ensuring that each through-hole 18 on the reflector sheet corresponds to a Mini LED light-emitting element on the lamp board. After pressing, all light-emitting elements can pass through the through-holes 18 and protrude from the reflective surface 11 of the reflector sheet. Their light-emitting surfaces can be approximately on the same plane as the reflective surface 11, or slightly protrude from the reflective surface 11 according to optical design requirements.

[0058] The optical films are stacked on top of the reflective sheet, with a predetermined light mixing distance between them. The optical film assembly may include, but is not limited to, a diffuser plate and at least one prism film. The diffuser plate is positioned closest to the reflective sheet to fully mix the direct light from each light-emitting element and the light reflected and converted by the reflective sheet, thereby eliminating bright spots and forming a uniform light field. The prism film is positioned above the diffuser plate to concentrate the homogenized light in a direction perpendicular to the display panel, thereby improving the front brightness of the displayed image.

[0059] When the backlight module is powered on, the light-emitting components on the lamp board emit light. Part of the light is directed upwards towards the optical films such as the diffuser plate, while the other part is directed outwards or backwards towards the reflective surface 11 of the reflective sheet. In the non-functional distribution area 1716 of the reflective sheet, this part of the light is efficiently reflected directly; while in the functional distribution area 17, the light interacts with the functional dots 14, with part of the light being directly reflected by the surface of the substrate 10, and part of the light being absorbed by the phosphor in the functional dots 14 and converted into light of different colors before being emitted.

[0060] The foregoing description of the specifications and embodiments is intended to explain the scope of protection of this utility model, but does not constitute a limitation on the scope of protection of this utility model. Modifications, equivalent substitutions, or other improvements to the embodiments of this utility model or a portion thereof that can be obtained by those skilled in the art through logical analysis, reasoning, or limited experimentation, based on the teachings of this utility model or the foregoing embodiments, should all be included within the scope of protection of this utility model.

Claims

1. A reflective sheet for a backlight module, characterized in that, include: Substrate (10), the substrate (10) having a reflective surface (11) for reflecting light, the reflective surface (11) having an enclosing outer boundary (12); and A functional layer (13) is disposed on the reflective surface (11) of the substrate (10), and the functional layer (13) includes phosphor. The functional layer (13) is a discontinuous layer composed of multiple functional traces (14), and the distribution of the functional traces (14) gradually spreads 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 as described in claim 1, characterized in that, The size of the functional dot trace (14) gradually increases from the outer boundary (12).

3. A reflective sheet for a backlight module as described in claim 1, characterized in that, The reflective surface (11) has an enclosing distribution boundary (15); the distribution boundary (15) is located within the outer boundary (12) and its internal region forms a non-functional distribution region (17)(16), and the region between the distribution boundary (15) and the outer boundary (12) forms a functional distribution region (17); the functional layer (13) is only provided in the functional distribution region (17).

4. A reflective sheet for a backlight module as described in claim 3, characterized in that, The shape of the distribution boundary (15) corresponds to that of the outer boundary (12) and surrounds the non-functional distribution area (17)(16) in a ring shape.

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

6. A reflective sheet for a backlight module as described in claim 1, characterized in that, The size range of the functional dot (14) is 0.15 to 0.35 mm.

7. A reflective sheet for a backlight module as described in claim 1, characterized in that, The thickness of the functional layer (13) is 4 micrometers to 8 micrometers.

8. A reflective sheet for a backlight module as described in claim 1, characterized in that, The functional layer (13) is composed of an ink containing phosphor, wherein the phosphor in the ink has a weight percentage concentration of 27% to 48%.

9. A reflective sheet for a backlight module as described in claim 1, characterized in that, It also includes an adhesive layer (21) disposed 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, Includes a reflective sheet for a backlight module as described in any one of claims 1 to 9, wherein the light-emitting element is disposed on the reflective sheet and exposed by the reflective surface (11).

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