Reflective structure and backlight module

Abstract

Regarding optical structures, we provide a reflective structure and a backlight module. [Solution] A reflective structure 130 comprising a main body 131 is provided. The main body has a plurality of light source grooves G and a plurality of reflective walls 1311. Each of the plurality of reflective walls surrounds a plurality of light source grooves, and the plurality of reflective walls are provided with a plurality of section walls FW, each section wall having a first wall portion WP1 and a second wall portion WP2 separated from each other. The main body is divided into a first portion PO1 and a second portion PO2 separated from each other by the plurality of section walls. The present invention further provides a backlight module 100 comprising the reflective structure. Since the backlight module employs the reflective structure of the present invention, when the ambient temperature rises, the difference in the amount of dimensional change between the reflective structure and other components can be reduced, and deformation caused by excessive differences in the amount of dimensional change of the backlight module can be prevented. Therefore, the durability of the backlight module can be improved.

Description

Technical Field

[0001] The present invention relates to an optical structure, and particularly to a reflective structure and a backlight module including the reflective structure.

Background Art

[0002] The structure of a liquid crystal display device mainly includes components such as a backlight module, a display panel, and an outer frame. Depending on the direction of the light source, the backlight module can be classified into an edge-type backlight module and a direct-lit backlight module. The direct-lit backlight module has the advantage of better uniformity of the surface light source and is advantageous for realizing the local dimming function. Therefore, a liquid crystal display device employing a direct-lit backlight module usually has better image contrast. In the market, many medium and large-sized liquid crystal display devices using light-emitting diodes (LEDs) as the light source employ a direct-lit backlight module.

[0003] Note that this paragraph of "Background Art" is only for helping the understanding of the content of the present invention. Therefore, the content disclosed in this "Background Art" may include content that does not constitute well-known technology known to those skilled in the art. Thus, the content disclosed in this "Background Art" does not mean that the above content, or the problems to be solved by one or more embodiments of the present invention, have been well-known or recognized by those skilled in the art before the filing of the present invention.

Summary of the Invention

[0004] An object of the present invention is to provide a reflective structure and reduce the amount of dimensional change when the environmental temperature rises.

[0005] Another object of the present invention is to provide a backlight module and improve its durability.

[0006] Other purposes and advantages of the present invention can be further understood from the technical features disclosed herein.

[0007] To achieve some or all of the aforementioned objectives, or other objectives, one embodiment of the present invention provides a reflective structure comprising a body. The body comprises a plurality of light source grooves and a plurality of reflective walls. Each of the plurality of reflective walls surrounds a plurality of light source grooves, and the plurality of reflective walls comprises a plurality of section walls, each section wall having a first wall portion and a second wall portion separated from each other. The body is divided into a first portion and a second portion separated from each other by these section walls.

[0008] In one embodiment of the present invention, each first wall portion has a first fracture surface, a first reflective surface, and a first bottom surface. The first fracture surface and the first reflective surface are connected to each other and are erected relative to the first bottom surface. Each second wall portion has, for example, a second fracture surface, a second reflective surface, and a second bottom surface. The second fracture surface faces the first fracture surface and is erected relative to the second bottom surface. The second reflective surface is connected to the second fracture surface and is erected relative to the second bottom surface. Each first reflective surface and each second reflective surface are located on opposite sides of the section wall.

[0009] In one embodiment of the present invention, each of the first fracture surfaces is substantially perpendicular to each of the first reflective surfaces, and each of the second fracture surfaces is substantially perpendicular to each of the second reflective surfaces.

[0010] In one embodiment of the present invention, for example, an acute angle is formed between each first fracture surface and each first reflective surface, and an acute angle is also formed between each second fracture surface and each second reflective surface.

[0011] In one embodiment of the present invention, the reflective structure further comprises, for example, a plurality of reflective sheets, each of which is installed between each first wall portion and each second wall portion.

[0012] In one embodiment of the present invention, each first wall portion further has a third reflective surface facing the first reflective surface, and each second wall portion further has a fourth reflective surface facing the second reflective surface. Each reflective sheet comprises, for example, a first flexible reflective sheet and a second flexible reflective sheet. The first flexible reflective sheet is fixed to the first reflective surface and the fourth reflective surface, respectively, and the second flexible reflective sheet is fixed to the second reflective surface and the third reflective surface, respectively.

[0013] In one embodiment of the present invention, each of the first wall portions further has, for example, a first upper end, which faces the first bottom surface. Each of the second wall portions further has a second upper end which faces the second bottom surface. Each of the first flexible reflective sheets and each of the second flexible reflective sheets has its first upper end and each of its second upper end exposed.

[0014] In one embodiment of the present invention, each of the first wall portions further has a third reflective surface and a first positioning portion, the third reflective surface facing the first reflective surface. The first positioning portion protrudes from the first fracture surface and is recessed between the first reflective surface and the third reflective surface. Each of the second wall portions further has, for example, a fourth reflective surface and a second positioning portion, the fourth reflective surface facing the second reflective surface. The second positioning portion protrudes from the second fracture surface and is recessed between the second reflective surface and the fourth reflective surface. The reflective sheet has bent portions corresponding to each of the first positioning portions and each of the second positioning portions. Each bent portion covers the corresponding first positioning portion and each of the second positioning portions and is spaced apart from each of the first positioning portions and each of the second positioning portions.

[0015] In one embodiment of the present invention, each of the first wall portions further has, for example, a first upper end, which faces the first bottom surface. Each of the second wall portions further has a second upper end which faces the second bottom surface, and each bent portion has an upper end located between the first upper end and the second upper end. The height of each upper end relative to each first bottom surface is less than or equal to the height of each first upper end relative to each first bottom surface, and the height of each upper end relative to each second bottom surface is less than or equal to the height of each second upper end relative to each second bottom surface.

[0016] In one embodiment of the present invention, each of the first fracture surfaces has a first positioning groove, and the first positioning groove extends to a first bottom surface. Each of the second fracture surfaces has a second positioning groove, and the second positioning groove extends to a second bottom surface. The reflective sheet has a bent portion corresponding to each of the first positioning grooves and each of the second positioning grooves. The bent portions are located within each of the first positioning grooves and each of the second positioning grooves, and are exposed from between each of the first and second wall portions. The bent portions are spaced apart from each of the first and second wall portions.

[0017] In one embodiment of the present invention, each of the first wall portions further has, for example, a first upper end, and each first upper end faces each first bottom surface. Each of the second wall portions further has a second upper end that faces each second bottom surface, and each bent portion has an upper end located between each first upper end and each second upper end. The height of each upper end relative to each first bottom surface is smaller than the height of each first upper end relative to each first bottom surface, and the height of each upper end relative to each second bottom surface is smaller than the height of each second upper end relative to each second bottom surface.

[0018] In one embodiment of the present invention, each light source groove has a light emission port and a bottom opening, and the light emission port and the bottom opening are opposite each other. Each reflective sheet has a gap between each first wall portion and each second wall portion, and each reflective sheet has a bent portion and an extended portion. The bent portions are each installed between each first wall portion and each second wall portion. The extended portions are each connected to the bent portions and each covers the bottom opening.

[0019] In one embodiment of the present invention, the first and second wall portions, which are separated from each other, form notches in the crosswall. Each notch further extends to at least one of the reflective walls adjacent to the crosswall.

[0020] In one embodiment of the present invention, each first wall portion has a first fracture side, and each second wall portion has a second fracture side. Each first fracture side and each second fracture side face each other and are separated from each other. Each first fracture side has a first light-shielding portion that protrudes toward the second fracture side, and each second fracture side has a first recess that structurally complements each other with respect to the first light-shielding portion.

[0021] In one embodiment of the present invention, each of the second fractured sides has, for example, a second light-shielding portion, and each second light-shielding portion protrudes toward each first fractured side. Each first fractured side also has a second recess that complements each other with respect to each second light-shielding portion.

[0022] In one embodiment of the present invention, the reflective wall further comprises a plurality of first reflective walls and a plurality of second reflective walls. The first reflective walls are connected to each other and extend along a first linear direction. The second reflective walls are connected to each other and extend along a second linear direction different from the first linear direction. At least one of the first reflective walls has a section, and at least one of the second reflective walls has a section.

[0023] In one embodiment of the present invention, the reflective wall further comprises a plurality of first reflective walls and a plurality of second reflective walls. The first reflective walls are connected to each other and extend along a first linear direction. The second reflective walls are connected to each other and extend along a second linear direction different from the first linear direction. At least a plurality of the first reflective walls have a section, or at least a plurality of the second reflective walls have a section.

[0024] In one embodiment of the present invention, each of the first wall portions has, for example, a first fracture surface, and each first fracture surface is directed toward each second wall portion. Each second wall portion has a second fracture surface that is directed toward each first fracture surface, and each first fracture surface is substantially parallel to each second fracture surface.

[0025] To achieve some or all of the above objectives or other objectives, an embodiment of the present invention provides a backlight module including a substrate, a plurality of light-emitting elements, and a reflection structure. The plurality of light-emitting elements are installed on the surface of the substrate. The reflection structure is installed on the surface of the substrate. Each light-emitting element is located in a light source groove of the reflection structure.

[0026] In the present invention, the main body of the reflection structure has a plurality of reflection walls each provided with a plurality of partition walls. The plurality of partition walls divide the main body into a first part and a second part separated from each other. When the environmental temperature rises, the first part and the second part separated from each other absorb the volume expansion amount of the main body, preventing the dimensions of the main body from rapidly changing due to the rise in the environmental temperature. Based on the above, the present invention can reduce the amount of dimensional change of the reflection structure when the environmental temperature rises. Since the backlight module of the present invention adopts the reflection structure, when the environmental temperature rises, the difference in the amount of dimensional change between the reflection structure and other components can be reduced, preventing the occurrence of deformation caused by the excessive difference in the amount of dimensional change of the backlight module. Therefore, the present invention can improve the durability of the backlight module.

[0027] To more clearly understand the above-mentioned or other objectives, features, and advantages of the present invention, the following preferred embodiments are given and described in detail as follows with reference to the accompanying drawings.

Brief Description of the Drawings

[0028] [Figure 1] FIG. 1 is a top view of a backlight module in an embodiment of the present invention. [Figure 2] FIG. 2 is a partial cross-sectional view along the A0-A0 cross-section line of the backlight module in FIG. 1. [Figure 3] FIG. 3 is a cross-sectional view along the A1-A1 cross-section line of the reflection structure in FIG. 1 before and after volume expansion. [Figure 4] FIG. 4 is a top view of a backlight module in another embodiment of the present invention. [Figure 5] Figure 5 is a perspective view of a backlight module in another embodiment of the present invention. [Figure 6] Figure 6 is a cross-sectional view of the backlight module in Figure 5 along the A2-A2 section line. [Figure 7] Figure 7 is a perspective view of a backlight module in another embodiment of the present invention. [Figure 8] Figure 8 is a perspective view of the backlight module from Figure 7 with the reflective sheet omitted. [Figure 9] Figure 9 is a cross-sectional view of the backlight module in Figure 7 along the A3-A3 section line. [Figure 10] Figure 10 is a top view of the backlight module shown in Figure 7. [Figure 11] Figure 11 is a perspective view of a backlight module in another embodiment of the present invention. [Figure 12] Figure 12 is a perspective view of the backlight module from Figure 11 with the reflective sheet omitted. [Figure 13] Figure 13 is a cross-sectional view of the backlight module in Figure 11 along the A4-A4 section line. [Figure 14] Figure 14 is a top view of a backlight module in another embodiment of the present invention. [Figure 15] Figure 15 is a top view of a backlight module in another embodiment of the present invention. [Figure 16] Figure 16 is a top view of a backlight module in another embodiment of the present invention. [Figure 17] Figure 17 is a top view of a backlight module in another embodiment of the present invention. [Figure 18] Figure 18 is a top view of a backlight module in another embodiment of the present invention. [Modes for carrying out the invention]

[0029] The content, features, and effects of the above-mentioned and other technologies of this invention will become clearer through the detailed description of the following preferred embodiments based on the attached drawings. Note that the directional terms used in the following embodiments, such as up, down, left, right, front, or back, are merely for reference to the directions in the attached drawings. Therefore, the directional terms used are for illustrative purposes only and not to limit this invention.

[0030] Figure 1 is a top view of a backlight module in one embodiment of the present invention. Figure 2 is a partial cross-sectional view of the backlight module of Figure 1 along the A0-A0 cross-sectional line. Referring to Figures 1 and 2, the backlight module 100 comprises a substrate 110, a plurality of light-emitting elements 120, and a reflective structure 130. The light-emitting elements 120 are installed on the surface S of the substrate 110. The reflective structure 130 is installed on the surface S. The reflective structure 130 comprises a main body 131. The main body 131 has a plurality of light source grooves G and a plurality of reflective walls 1311. Each of the plurality of reflective walls 1311 surrounds a plurality of light source grooves G, and each of the plurality of light-emitting elements 120 is located within the plurality of light source grooves G of the reflective structure 130. The plurality of reflective walls 1311 comprises a plurality of section walls FW, and the section walls FW have a first wall portion WP1 and a second wall portion WP2 that are separated from each other. The separated first wall portion WP1 and the second wall portion WP2 form a notch F in the section wall FW. In other words, the notch F is located between the first wall section WP1 and the second wall section WP2, and the first wall section WP1 and the second wall section WP2 are separated from each other by the notch F. The main body 131 is divided into a first section PO1 and a second section PO2, which are separated from each other by multiple notches F in the multiple section walls FW.

[0031] The substrate 110 includes, for example, a circuit board, and the circuit board includes a printed wiring board, but the present invention is not limited thereto.

[0032] Figure 3 is a cross-sectional view along the A1-A1 line of the reflective structure in Figure 1 before and after volume expansion. Figure 3(a) shows the main body 131 at room temperature, and Figure 3(b) shows the main body 131 after the volume has expanded following a temperature increase. Referring to Figures 1 and 3, in this embodiment, the main body 131 of the reflective structure 130 may be made of a material with a different thermal expansion coefficient than the substrate 110. For example, the material of the main body 131 may include polycarbonate (PC), and the thermal expansion coefficient of the polycarbonate is greater than that of the substrate 110. Since the main body 131 and the substrate 110 are fixed to each other, when the ambient temperature in which the backlight module 100 is placed rises, the amount of volume expansion of the main body 131 becomes greater than the amount of volume expansion of the substrate 110. Furthermore, as the first portion PO1 and the second portion PO2 expand in volume, each first wall portion WP1 expands in direction D1 and each second wall portion WP2 expands in direction D2, preventing the volume of the main body 131 from expanding excessively outward. Therefore, in this embodiment, the notches F absorb the volume expansion of the first portion PO1 and the second portion PO2, reducing the dimensional change of the main body 131 and preventing deformation of the substrate 110 due to a rapid dimensional expansion of the main body 131.

[0033] On the other hand, the backlight module 100 further includes a backing plate 140 (see Figure 2), which is fixed to the side of the substrate 110 facing away from the reflective structure 130. Similarly, the thermal expansion coefficient of the main body 131 is greater than that of the backing plate 140, and the difference in dimensional change between the main body 131 and the backing plate 140 after the ambient temperature rises is effectively reduced by the crosswall FW, preventing the dimensions of the main body 131 from rapidly expanding and causing deformation of the backing plate 140.

[0034] Referring further to Figures 1 and 2, in this embodiment, the plurality of reflective walls 1311 further comprises a plurality of first reflective walls RW1 and a plurality of second reflective walls RW2. The plurality of first reflective walls RW1 are connected to each other and extend along a first linear direction X. The plurality of second reflective walls RW2 are connected to each other and extend along a second linear direction Y that is different from the first linear direction X. At least a plurality of the plurality of first reflective walls RW1 are provided with section walls FW, or at least a plurality of the second reflective walls RW2 are provided with section walls FW. Therefore, the section walls FW can absorb the volume expansion of the main body 131 in the first linear direction X or the second linear direction Y, thereby reducing the dimensional change of the reflective structure 130 in the first linear direction X or the second linear direction Y.

[0035] For example, in this embodiment, the four first reflective walls RW1 are section walls FW, and none of the second reflective walls RW2 have section walls FW. All four section walls FW are located in the same row, dividing the main body 131 into a first part PO1 and a second part PO2 to absorb the volume expansion of the main body 131 in the first linear direction X. In an embodiment not shown, none of the first reflective walls RW1 have section walls FW, and at least some of the second reflective walls RW2 have section walls FW, all of which are located in the same column (for example, along the first linear direction X), dividing the main body 131 into a first part PO1 and a second part PO2 to absorb the volume expansion of the main body 131 in the second linear direction Y. In this embodiment, the first linear direction X and the second linear direction Y are, for example, substantially perpendicular, and the first reflective walls RW1 and the second reflective walls RW2 are arranged alternately in a grid pattern, forming an array of light source grooves G.

[0036] In this embodiment, each section wall FW has a first wall portion WP1 with a first fracture surface S1, a first reflective surface RS1, and a first bottom surface BS1. The first fracture surface S1 and the first reflective surface RS1 are connected to each other and are erected relative to the first bottom surface BS1. The first fracture surface S1 faces the adjacent second wall portion WP2. Each section wall FW has, for example, a second fracture surface S2, a second reflective surface RS2, and a second bottom surface BS2. The second fracture surface S2 faces the first fracture surface S1 (i.e., the adjacent first wall portion WP1) and is erected relative to the second bottom surface BS2. The second reflective surface RS2 is connected to the second fracture surface S2 and is erected relative to the second bottom surface BS2. The first reflective surface RS1 and the second reflective surface RS2 in each section wall FW are located on opposite sides of the section wall FW, respectively. For example, the first reflective surface RS1 and the second reflective surface RS2 are oriented in different directions. The first reflective surface RS1 is located on the YZ plane and oriented in a direction between the second linear direction Y and direction Z, while the second reflective surface RS2 is located on the YZ plane and oriented in a direction between direction -Y (opposite to the second linear direction Y) and direction Z. Furthermore, the first reflective surface RS1 and the second reflective surface RS2 are located within two adjacent light source grooves G. Each notch F is located between the first fracture surface S1 and the second fracture surface S2, which face each other.

[0037] Furthermore, each first wall WP1 has a third reflective surface RS3 facing the first reflective surface RS1, and each second wall WP2 has a fourth reflective surface RS4 facing the second reflective surface RS2. More specifically, the shapes of the first wall WP1 and the second wall WP2 are triangular prisms, and the first fracture surface S1 and the second fracture surface S2 are the end faces of the triangular prisms, respectively. The first reflective surface RS1, the third reflective surface RS3, and the first base surface BS1 are connected to the first fracture surface S1, and the second reflective surface RS2, the fourth reflective surface RS4, and the second base surface BS2 are connected to the second fracture surface S2. In this embodiment, the first base surface BS1 and the second base surface BS2 are substantially parallel to the XY plane, the first reflective surface RS1 and the third reflective surface RS3 are inclined with respect to the first base surface BS1, and the second reflective surface RS2 and the fourth reflective surface RS4 are inclined with respect to the second base surface BS2. The first reflective surface RS1 and the fourth reflective surface RS4 are oriented in the same direction (located on the YZ plane in Figure 1, in a direction between the second linear direction Y and direction Z) and are located within the same light source groove G. Similarly, the second reflective surface RS2 and the third reflective surface RS3 are oriented in the same direction (located on the YZ plane in Figure 1, in a direction between direction -Y and direction Z) and are located within the same light source groove G. The first fracture surface S1 and the second fracture surface S2 also have light-reflecting functions. For example, the main body 131 is manufactured by integral molding of a reflective material, and all surfaces of the first wall portion WP1 and the second wall portion WP2 have light-reflecting functions.

[0038] Each first fracture surface S1 is substantially perpendicular to each first reflective surface RS1, and each second fracture surface S2 is substantially perpendicular to each second reflective surface RS2. This allows for a reduction in the length L of the notch F, making it easier to machine and form the notch F. In this embodiment, the notch F is formed by cutting the first reflective wall RW1 along a second linear direction Y, and the length L of the notch F in the second linear direction Y is approximately equal to the width W0 of the first reflective wall RW1. In one embodiment, the angle between the first fracture surface S1 and the first reflective surface RS1 is in the range of approximately 85 to 95 degrees, and the angle between the second fracture surface S2 and the second reflective surface RS2 is also in the range of approximately 85 to 95 degrees. In this embodiment, the notch F is formed by cutting the reflective wall 1311, and in one embodiment, the main body 131 having the notch F is directly formed by integral molding.

[0039] In this embodiment, the first fracture surface S1 in each section wall FW is substantially parallel to the second fracture surface S2 in the section wall FW. For example, the first fracture surface S1 and the second fracture surface S2 are substantially parallel to the YZ plane. This keeps the width W of the notch F in the first linear direction X constant, i.e., the distance between the first fracture surface S1 and the second fracture surface S2 in the first linear direction X is maintained at a constant distance. Therefore, even if the first fracture surface S1 and / or the second fracture surface S2 are not perfect planes, but for example, curved or sawtooth surfaces, the distance between the first fracture surface S1 and the second fracture surface S2 at corresponding different positions on the first and second fracture surfaces S1 and S2 respectively is still maintained at a constant distance, leaving space for the first wall portion WP1 and the second wall portion WP2 to expand in volume. In this way, even if the first wall portion WP1 and the second wall portion WP2 expand in volume, contact with each other can be further prevented. In one embodiment, the angle between the first fracture surface S1 and the second fracture surface S2 is in the range of approximately -5 degrees to +5 degrees, but the present invention is not limited to this. In this embodiment, the width W of the notch F is set based on factors such as the material and dimensions of the main body 131. For example, in one embodiment, the width W of the notch F is in the range of approximately 0.5 mm to 1.5 mm, but in other embodiments, it is not limited to this.

[0040] In this embodiment, the light-emitting elements 120 are arranged in an array on the surface S of the substrate 110. The light-emitting elements 120 are fixed to the surface S of the substrate 110 in advance and electrically connected to the substrate 110. The reflective structure 130 is aligned with the light-emitting elements 120 by light source grooves G and fixed to the surface S of the substrate 110. The light-emitting elements 120 include, for example, light-emitting diodes, but the present invention is not limited thereto.

[0041] Compared with known technologies, in this embodiment, the main body 131 of the reflective structure 130 has a plurality of reflective walls 1311, and the plurality of reflective walls 1311 are provided with a plurality of section walls FW, and the main body 131 is divided into a first part PO1 and a second part PO2 separated from each other by the cutouts F of the plurality of section walls FW. As a result, when the ambient temperature rises, the volume expansion of the main body 131 is absorbed by the separated first part PO1 and second part PO2, and the dimensions of the main body 131 do not change rapidly due to the rise in ambient temperature. Based on the above, this embodiment can reduce the amount of dimensional change of the reflective structure 130 when the ambient temperature rises. In this embodiment, since the backlight module 100 employs the reflective structure 130, the difference in the amount of dimensional change between the reflective structure 130 and other components (e.g., the substrate 110 and the backing plate 140) can be reduced when the ambient temperature rises, and deformation caused by an excessive difference in the amount of dimensional change of the backlight module 100 can be prevented. Therefore, this embodiment can improve the durability of the backlight module 100.

[0042] Figure 4 is a top view of a backlight module in another embodiment of the present invention. The structure and advantages of the backlight module 100a and reflective structure 130a in this embodiment are similar to those of the embodiment in Figure 1, so only the differences will be described below. Referring to Figure 4, at least one of the first reflective walls RW1 is provided with a section wall FW, and at least one of the second reflective walls RW2 is provided with a section wall FW. As a result, these section walls FW can absorb the volume expansion of the reflective structure 130a in the first linear direction X and the second linear direction Y, respectively, and reduce the dimensional change of the reflective structure 130a in both directions in the first linear direction X and the second linear direction Y. Specifically, in this embodiment, four different horizontal rows of first reflective walls RW1 are section walls FW, and four different vertical rows of second reflective walls RW2 are section walls FW. Similarly, the widths W of all the notches F are approximately equal to each other, which more evenly absorbs the volume expansion of the main body 131a.

[0043] Figure 5 is a perspective view of a backlight module in another embodiment of the present invention. Figure 6 is a cross-sectional view of the backlight module of Figure 5 along the A2-A2 cross-sectional line. The structure and advantages of the backlight module 100b and reflective structure 130b in this embodiment are similar to those of the embodiment in Figure 1, so only the differences will be described below. Referring to Figures 5 and 6, the reflective structure 130b further comprises, for example, a plurality of reflective sheets 132, each of which is installed between the first wall portion WP1 and the second wall portion WP2 of each section FW, thereby reflecting more light rays emitted from the light-emitting element 120 and causing them to exit from the light source groove G, thereby improving the light utilization rate of the backlight module 100b. In this embodiment, each reflective sheet 132 comprises, for example, a first flexible reflective sheet 1321 and a second flexible reflective sheet 1322. In each section FW, the first flexible reflective sheet 1321 is fixed to the first reflective surface RS1 and the fourth reflective surface RS4, and the second flexible reflective sheet 1322 is fixed to the second reflective surface RS2 and the third reflective surface RS3.

[0044] More specifically, the opposing sides of the first flexible reflective sheet 1321 are bonded to the first reflective surface RS1 and the fourth reflective surface RS4, respectively, and the middle portion of the first flexible reflective sheet 1321 is located between the first wall portion WP1 and the second wall portion WP2, covering a part of the cutout F. Similarly, the opposing sides of the second flexible reflective sheet 1322 are bonded to the second reflective surface RS2 and the third reflective surface RS3, respectively, and the middle portion of the second flexible reflective sheet 1322 is located between the first wall portion WP1 and the second wall portion WP2, covering a part of the cutout F. Furthermore, since the hardness of the materials of the first flexible reflective sheet 1321 and the second flexible reflective sheet 1322 is lower than that of the reflective structure 130b, when compressed by the first wall portion WP1 and the second wall portion WP2, the first flexible reflective sheet 1321 and the second flexible reflective sheet 1322 deform, leaving room for volume expansion of the first wall portion WP1 and the second wall portion WP2. In one embodiment, the first flexible reflective sheet 1321 and the second flexible reflective sheet 1322 have a structure that is prone to valley folds, and the structure includes, for example, auxiliary fold lines or perforations, to make the first flexible reflective sheet 1321 and the second flexible reflective sheet 1322 more easily deformed when compressed.

[0045] Each first wall portion WP1 in this embodiment has, for example, a first upper end T1, which faces the first bottom surface BS1. Each second wall portion WP2 has a second upper end T2 which faces the second bottom surface BS2. Each first flexible reflective sheet 1321 and each second flexible reflective sheet 1322 exposes their respective first upper ends T1 and each second upper ends T2, and also exposes portions of each notch F that are close to their respective first upper ends T1 and each second upper ends T2. More specifically, each of the plurality of light source grooves G has a light emission opening O1 and a bottom opening O2, and the light emission opening O1 and the bottom opening O2 face each other. The light-emitting element 120 is located at the bottom opening O2, and in each wall FW, the first upper end T1 and the second upper end T2 surround the light emission opening O1. Since the first flexible reflective sheet 1321 and the second flexible reflective sheet 1322 do not extend to the first upper end T1 and the second upper end T2, the amount of light reflected by the first flexible reflective sheet 1321 and the second flexible reflective sheet 1322 passing through the light emission opening O1 is reduced, making it easier for light rays from the light-emitting element 120 to pass above the first flexible reflective sheet 1321 and the second flexible reflective sheet 1322 (i.e., the side facing away from the substrate 110), thereby improving the uniformity of emission. In addition, the portions of the notch F that are close to the first upper end T1 and the second upper end T2 of the first flexible reflective sheet 1321 and the second flexible reflective sheet 1322 are exposed.

[0046] Figure 7 is a perspective view of a backlight module in another embodiment of the present invention. Figure 8 is a perspective view of the backlight module of Figure 7 with the reflective sheet omitted. Figure 9 is a cross-sectional view of the backlight module of Figure 7 along the A3-A3 cross-sectional line. Figure 10 is a top view of the backlight module of Figure 7. The structure and advantages of the backlight module 100c and reflective structure 130c in this embodiment are similar to those of the embodiment in Figure 5, so only the differences will be described below. First, referring to Figures 7, 8, and 9, each first wall portion WP1 of the main body 131c further has a first positioning portion P1. The first positioning portion P1 protrudes from the first fracture surface S1 and is recessed between the first reflective surface RS1 and the third reflective surface RS3. Also, each second wall portion WP2 further has, for example, a second positioning portion P2. The second positioning portion P2 protrudes from the second fracture surface S2 and is recessed between the second reflective surface RS2 and the fourth reflective surface RS4. The reflective sheet 132c has bent portions 1323c corresponding to the first positioning portion P1 and the second positioning portion P2, respectively. In each section wall FWc, the bent portions 1323c cover the first positioning portion P1 and the second positioning portion P2, and there is a gap between them. In this embodiment, the bent portions 1323c of the reflective sheet 132c are installed between the first wall portion WP1 and the second wall portion WP2, and cover the first positioning portion P1 and the second positioning portion P2 in correspondence with them, but do not cover the first upper end T1 of the first wall portion WP1 and the second upper end T2 of the second wall portion WP2.

[0047] Referring to Figure 9, it must be explained that the bent portion 1323c has a gap from the first positioning portion P1, and the relative positional relationship between the bent portion 1323c and the second positioning portion P2 is generally the same as the relative positional relationship between the bent portion 1323c and the first positioning portion P1. Therefore, the backlight module 100c improves light utilization efficiency with the bent portion 1323c, leaving space between the bent portion 1323c, the first wall portion WP1, and the second wall portion WP2 for the first wall portion WP1 and the second wall portion WP2 to expand. To explain further, the bent portion 1323c has a gap from the first fracture surface S1 and the second fracture surface S2, that is, the reflective sheet 132c has a gap from the first wall portion WP1 and the second wall portion WP2, thereby providing further space for the first wall portion WP1 and the second wall portion WP2 to expand. Furthermore, the bent portion 1323c has a shape that complements the first positioning portion P1 and the second positioning portion P2, facilitating alignment and attachment to the first positioning portion P1 and the second positioning portion P2. For example, the first positioning portion P1 and the second positioning portion P2 are triangular prisms, and the bent portion 1323c is folded in a valley fold to form a recess that complements the triangular prism.

[0048] Referring to Figures 7 and 9, the bent portion 1323c has an upper end T located between the first upper end T1 and the second upper end T2. The height H1 of each upper end T relative to each first bottom surface BS1 is less than or equal to the height H2 of each first upper end T1 relative to each first bottom surface BS1. Also, the height of each upper end T relative to each second bottom surface BS2 (same as height H1) is less than or equal to the height H3 of each second upper end T2 relative to each second bottom surface BS2. In this embodiment, heights H1, H2, and H3 are exemplified as being equal to each other. Therefore, the upper end T avoids excessive reflection of light rays passing through the light output opening O1 compared to the first upper end T1 and the second upper end T2, and improves the uniformity of the light output of the backlight module 100c.

[0049] Referring to Figures 9 and 10, each reflective sheet 132c also has, for example, an extended portion 1324c. In each reflective sheet 132c, the extended portion 1324c is connected to the bent portion 1323c and covers the bottom opening O2 of the light source groove G. This improves the light utilization rate. Specifically, the extended portion 1324c covers a part of the bottom opening O2 and is fixed to the substrate 110 by the bottom opening O2. Furthermore, the extended portion 1324c has a relief hole aligned with the light-emitting element 120.

[0050] Figure 11 is a perspective view of a backlight module in another embodiment of the present invention. Figure 12 is a perspective view of the backlight module of Figure 11 with the reflective sheet omitted. Figure 13 is a cross-sectional view of the backlight module of Figure 11 along the A4-A4 section line. The structure and advantages of the backlight module 100d and the reflective structure 130d in this embodiment are similar to those of the embodiment in Figure 5, so only the differences will be described below. Referring to Figures 11, 12, and 13, the first fracture surface S1d has a first positioning groove G1 (see Figure 13). The first positioning groove G1 is recessed into the first wall WP1d from the first fracture surface S1d and does not extend to the first reflective surface RS1d and the third reflective surface RS3d, but extends to the first bottom surface BS1d. The second fracture surface S2d has a second positioning groove G2. The second positioning groove G2 is recessed into the second wall WP2d from the second fracture surface S2d and does not extend to the second reflective surface RS2d and the fourth reflective surface RS4d, but extends to the second bottom surface BS2d. The bent portion 1323d of the reflective sheet 132d is installed to correspond to the first positioning groove G1 and the second positioning groove G2, respectively. In each section wall FWd, the bent portion 1323d is located within the first positioning groove G1 and the second positioning groove G2 and is exposed from between the first wall WP1d and the second wall WP2d. The bent portion 1323d has a gap between it and the first wall WP1d and the second wall WP2d, respectively. As a result, the backlight module 100d improves light utilization efficiency with the bent portion 1323d and leaves space for the first wall WP1d and the second wall WP2d of the main body 131d to expand. To explain in more detail, the opposing sides of the bent portion 1323d are inserted into the first positioning groove G1 and the second positioning groove G2, respectively, and are covered by the first wall portion WP1d and the second wall portion WP2d. The middle portion of the bent portion 1323d is exposed between the first wall portion WP1d and the second wall portion WP2d, blocking a part of the notch F.

[0051] The height H3 of the upper end Td of each bent portion 1323d relative to each first bottom surface BS1d is smaller than the height H1 of each first upper end T1 relative to each first bottom surface BS1d. Also, the height of each upper end Td relative to each second bottom surface BS2d (same as height H3) is smaller than the height H2 of each second upper end T2 relative to each second bottom surface BS2d. This prevents the upper end Td from excessively reflecting light rays passing through the light output port O1 compared to the first upper end T1 and the second upper end T2, and improves the uniformity of the output of the backlight module 100d. Similarly, the reflective sheet 132d further improves the light utilization rate of the backlight module 100d by the extended portion 1324d, and the extended portion 1324d may be omitted in the reflective sheet 132d in other embodiments. The characteristics of the extended portion 1324d are generally the same as those of the extended portion 1324c in Figures 9 and 10, so a detailed explanation is omitted here. In this embodiment, the first bottom surface BS1d and the second bottom surface BS2d have gaps through which the extended portion 1324d can protrude (see Figures 11 and 12), and the first positioning groove G1 and the second positioning groove G2 are in communication with these gaps.

[0052] Figure 14 is a top view of a backlight module in another embodiment of the present invention. The structure and advantages of the backlight module 100e and the reflective structure 130e in this embodiment are similar to those of the embodiment in Figure 1, so only the differences will be described below. Referring to Figure 14, there is, for example, an acute angle SA1 between each first fracture surface S1e and each first reflective surface RS1e, and there is an acute angle SA2 between each second fracture surface S2e and each second reflective surface RS2e. In other words, the notch F1 penetrates the reflective wall 1311e at an angle with respect to the second linear direction Y. As a result, the first fracture surface S1e and the second fracture surface S2e block more light rays from passing through the notch F1, and more light rays are emitted from the light emission opening O1, thereby making the emitted brightness of each light source groove G more uniform. In this embodiment, the first fracture surface S1e and the second fracture surface S2e are substantially perpendicular to the XY plane, for example, and the first fracture surface S1e and the second fracture surface S2e are substantially parallel to each other, i.e., the acute angles SA1 and SA2 are roughly the same. Similarly, the first fracture surface S1e and the second fracture surface S2e have a light-reflecting function. In one embodiment, the reflective sheet 132 of Figure 5, the reflective sheet 132c of Figure 7, and the reflective sheet 132d of Figure 11 are installed on the main body 131e of the reflective structure 130e, thereby further improving the light utilization rate of the backlight module 100e.

[0053] Figure 15 is a top view of a backlight module in another embodiment of the present invention. The structure and advantages of the backlight module 100f and reflective structure 130f in this embodiment are similar to those of the embodiment in Figure 1, so only the differences will be described below. Referring to Figure 15, the notch F2 further extends to one of the reflective walls 1311f adjacent to the section wall FWf, and cuts the reflective wall 1311f adjacent to the section wall FWf. In other words, the same notch F2 cuts two adjacent reflective walls 1311f arranged and installed along one direction to form two adjacent section walls FWf. In this embodiment, the notch F2 is inclined, for example, with respect to a first linear direction X and a second linear direction Y, and cuts two first reflective walls RW1f connected along the first linear direction X. In one embodiment, the notch F2 cuts two adjacent first reflective walls RW1f arranged and installed along the second linear direction Y of the main body 131f, or cuts an adjacent first reflective wall RW1f and a second reflective wall RW2f. In this embodiment, the notch F2 maintains an equal width along the first linear direction X. In the preceding description, the section wall FWf and one reflective wall 1311f adjacent to the section wall FWf were described as two adjacent reflective walls 1311f, but the embodiment is not limited to this. In other embodiments, the section wall FWf and multiple reflective walls 1311f adjacent to the section wall FWf (for example, two reflective walls 1311f connected to both ends of the section wall FWf in one direction) are divided by the same notch F2, that is, the notch F2 cuts three or more adjacent reflective walls 1311f. Similarly, the reflective sheet 132 shown in Figure 5, the reflective sheet 132c shown in Figure 7, and the reflective sheet 132d shown in Figure 11 are installed on the main unit 131f, thereby further improving the light utilization rate.

[0054] Figure 16 is a top view of a backlight module in another embodiment of the present invention, with Figures 16(a) and (b) showing two different embodiments. The structure and advantages of the backlight module 100g and reflective structure 130g in this embodiment are similar to those of the embodiment in Figure 1, so only the differences will be described below. First, referring to embodiment (a) in Figure 16, each first wall portion WP1g of the main body 131g has a first fracture side FS1, and each second wall portion WP2g has a second fracture side FS2. Each first fracture side FS1 and each second fracture side FS2 face each other and are separated from each other. Each first fracture side FS1 has a first light-shielding portion B1 that protrudes toward each second fracture side FS2, and each second fracture side FS2 has a first recess R1 that structurally complements each first light-shielding portion B1. As a result, the first fracture side FS1 and the second fracture side FS2 block more light rays from passing through the notch F3 and allow more light rays to be emitted from the light emission opening O1, thereby making the emitted brightness of each light source groove G more uniform. Furthermore, the first fracture side FS1 and the second fracture side FS2 have a light reflection function, which further improves the light utilization rate. In this embodiment, the shape of the first light-shielding part B1 is, for example, generally a triangular prism, and the shape of the first recess R1 is a shape that complements the triangular prism. Similarly, the notch F3 maintains an equal width in the first linear direction X, and the first light-shielding part B1 and the first recess R1 are formed by cutting or integral molding.

[0055] Furthermore, the light-shielding effect of the first light-shielding portion B1 can be changed by adjusting the angle IA1 between the notch F3 and the first linear direction X. For example, referring to embodiment (b) of Figure 16, the angle IA2 between the notch F3b and the first linear direction X is smaller than the angle IA1 in embodiment (a), and the notch F3b still maintains an equal width in the first linear direction X. In one embodiment, the width W of the notch F3b is in the range of approximately 0.5 mm to 1.5 mm, and the angle IA2 is in the range of 9 degrees to 37 degrees, but the present invention is not limited thereto.

[0056] Figure 17 is a top view of a backlight module in another embodiment of the present invention. Figure 18 is a top view of a backlight module in another embodiment of the present invention, with two different embodiments shown in Figures 18(a) and (b). The structure and advantages of the backlight module 100h and reflective structure 130h in this embodiment are similar to those of the embodiment in Figure 16, so only the differences will be described below. First, referring to Figure 17, each second broken side FS2h of the main body 131h has, for example, a further second light-shielding portion B2, each second light-shielding portion B2 protruding toward each first broken side FS1h. Also, each first broken side FS1h has a further second recess R2 that complements each second light-shielding portion B2, and the first broken side FS1h and the second broken side FS2h can block more light rays from passing through the notch F4. Similarly, the notch F4 maintains an equal width along the first linear direction X. The shape of the second light-shielding section B2 is generally a triangular prism, and the shape of the first recess R1 complements the shape of the triangular prism, with the notch formed in a sawtooth shape. The more first light-shielding sections B1 and second light-shielding sections B2 there are, the better the light-shielding effect provided. Therefore, the larger the width W of the notch F4, the better the light-shielding effect can be provided by arranging more first light-shielding sections B1 and second light-shielding sections B2.

[0057] For example, in this embodiment, the first fracture side FS1h has two first light-shielding portions B1 and one second recess R2, with the second recess R2 located between the two first light-shielding portions B1. The second fracture side FS2h has two second light-shielding portions B2 and one first recess R1, but the present invention does not particularly limit the number of second light-shielding portions B2 and second recess R2. For example, referring to embodiment(a) of Figure 18, the second fracture side FS2i has three second light-shielding portions B2 and two first recess R1. Embodiment(b) of Figure 18 shows that the first fracture side FS1j has three first light-shielding portions B1 and two second recess R2, and the second fracture side FS2j has three second light-shielding portions B2 and two first recess R1.

[0058] In summary, in this invention, the main body of the reflective structure has multiple reflective walls, each having multiple cross-sections, and the main body is divided into a first part and a second part, which are separated from each other, by multiple notches in the multiple cross-sections. As a result, when the ambient temperature rises, the first part and the second part, which are separated from each other, absorb the volume expansion of the main body, thus preventing the dimensions of the main body from changing rapidly due to the rise in ambient temperature. Based on the above, this invention can reduce the amount of dimensional change of the reflective structure when the ambient temperature rises. Since the backlight module of this invention employs the reflective structure, the difference in the amount of dimensional change between the reflective structure and other parts can be reduced when the ambient temperature rises, and deformation caused by an excessive difference in the amount of dimensional change of the backlight module can be prevented. Therefore, this invention can improve the durability of the backlight module.

[0059] The above description is merely a preferred embodiment of the present invention, and the scope of implementation of the present invention is not limited thereto. Simple and equivalent changes and modifications based on the claims and specifications of the present invention also fall within the scope of the present invention. Furthermore, any single embodiment or claim of the present invention does not necessarily have to achieve all the purposes, advantages, or features disclosed by the present invention. In addition, the abstract and the title of the invention are provided solely for patent search purposes and do not limit the scope of the claims of the present invention. Moreover, terms such as "first," "second," etc., mentioned in this specification or the claims of the present invention are merely names for elements or for distinguishing different embodiments or scopes, and do not limit the upper or lower limits on the quantity of elements. [Explanation of symbols]

[0060] 100, 100a, 100b, 100c, 100d, 100e, 100f, 100g, 100h: Backlight Module 110: Circuit board 120: Light-emitting element 130, 130a, 130b, 130c, 130d, 130e, 130f, 130g, 130h: Reflective structure 131, 131a, 131b, 131c, 131d, 131e, 131f, 131g, 131h: Main unit 132, 132c, 132d: Reflective sheet 140: Backing board 1311, 1311e, 1311f: Reflecting walls 1321: First Flexible Reflective Sheet 1322: Second Flexible Reflective Sheet 1323c, 1323d: Bent part 1324c, 1324d: Stretched part A0-A0, A1-A1, A2-A2, A3-A3, A4-A4: Section line B1: 1st light shielding part B2:Second light shielding part BS1, BS1d: 1st bottom BS2, BS2d: Second bottom surface D1, D2: Direction F, F1, F2, F3, F3b, F4: Notches FS1, FS1h, FS1i, FS1j: First fracture side FS2, FS2h, FS2i, FS2j: Second fracture side FW, FWc, FWd, FWf: Cliff G: Light source groove G1: First positioning groove G2: Second positioning groove H1, H2, H3, H4: Height IA1, IA2: Include angle L: Length O1: Light output port O2: Bottom opening P1: First positioning unit P2: Second positioning unit PO1: 1st part PO2: 2nd part R1: First recess R2: Second recess RS1, RS1d, ​​RS1e: 1st reflective surface RS2, RS2d, RS2e: Second reflective surface RS3, RS3d: Third reflective surface RS4, RS4d: 4th reflective surface RW1, RW1f: 1st reflection wall RW2, RW2f: Second reflecting wall S:Surface S1, S1d, S1e: 1st fracture surface S2, S2d, S2e: 2nd fracture surface SA1, SA2: Acute angle T, Td: Upper end T1: 1st top end T2: 2nd top end W, W0: Width WP1, WP1d, WP1g: First wall section WP2, WP2d, WP2e, WP2g: Second wall section X: First straight line direction Y: Second straight line direction Z: Direction

Claims

1. A reflective structure comprising a main body having a plurality of light source grooves and a plurality of reflective walls, wherein the plurality of reflective walls comprises a plurality of section walls, each surrounding the plurality of light source grooves, and each of the plurality of section walls has a first wall portion and a second wall portion separated from each other, and is divided into a first part and a second part separated from each other by the plurality of section walls.

2. Each of the plurality of first wall portions has a first fracture surface, a first reflective surface, and a first bottom surface, the first fracture surface and the first reflective surface are connected to each other and are erected on the first bottom surface. Each of the plurality of second wall portions has a second fracture surface, a second reflective surface, and a second bottom surface, wherein the second fracture surface faces the first fracture surface and is erected on the second bottom surface, and the second reflective surface is connected to the second fracture surface and is erected on the second bottom surface. The reflective structure according to claim 1, characterized in that each of the plurality of first reflective surfaces and each of the plurality of second reflective surfaces are located on opposite sides of each of the plurality of crosswalls.

3. Each of the plurality of first fracture surfaces is substantially perpendicular to each of the plurality of first reflective surfaces, The reflective structure according to claim 2, wherein each of the plurality of second fracture surfaces is substantially perpendicular to each of the plurality of second reflective surfaces.

4. An acute angle is formed between each of the plurality of first fracture surfaces and each of the plurality of first reflective surfaces. The reflective structure according to claim 2, characterized in that an acute angle is formed between each of the plurality of second fracture surfaces and each of the plurality of second reflective surfaces.

5. The reflective structure according to claim 2, further comprising a plurality of reflective sheets installed between each of the plurality of first wall portions and each of the plurality of second wall portions.

6. Each of the aforementioned plurality of first wall portions further has a third reflective surface facing the first reflective surface, Each of the plurality of second wall portions further has a fourth reflective surface facing the second reflective surface, Each of the aforementioned plurality of reflective sheets comprises a first flexible reflective sheet and a second flexible reflective sheet. The first flexible reflective sheet is fixed to the first reflective surface and the fourth reflective surface, respectively. The reflective structure according to claim 5, characterized in that the second flexible reflective sheet is fixed to the second reflective surface and the third reflective surface, respectively.

7. Each of the aforementioned plurality of first wall portions further has a first upper end, and the first upper end faces the first bottom surface. Each of the aforementioned plurality of second wall portions further has a second upper end facing the second bottom surface, The reflective structure according to claim 6, characterized in that each of the plurality of first flexible reflective sheets and each of the plurality of second flexible reflective sheets has its respective plurality of first upper end and each of the plurality of second upper end exposed.

8. Each of the plurality of first wall portions further has a third reflective surface and a first positioning portion, the third reflective surface facing the first reflective surface, and the first positioning portion protruding from the first fracture surface and recessed between the first reflective surface and the third reflective surface. Each of the plurality of second wall portions further has a fourth reflective surface and a second positioning portion, the fourth reflective surface facing the second reflective surface, and the second positioning portion protruding onto the second fracture surface and recessed between the second reflective surface and the fourth reflective surface. The reflective structure according to claim 5, characterized in that each of the plurality of reflective sheets has a bent portion corresponding to each of the plurality of first positioning portions and each of the plurality of second positioning portions, and each of the plurality of bent portions covers the corresponding plurality of first positioning portions and each of the plurality of second positioning portions and has a gap between it and each of the plurality of first positioning portions and each of the plurality of second positioning portions.

9. Each of the aforementioned plurality of first wall portions further has a first upper end facing the first bottom surface, Each of the aforementioned plurality of second wall portions further has a second upper end facing the second bottom surface, Each of the aforementioned multiple bent portions has an upper end located between the first upper end and the second upper end, The reflective structure according to claim 8, characterized in that the height of each of the plurality of upper ends relative to each of the plurality of first bottom surfaces is less than or equal to the height of each of the plurality of first upper ends relative to each of the plurality of first bottom surfaces, and the height of each of the plurality of upper ends relative to each of the plurality of second bottom surfaces is less than or equal to the height of each of the plurality of second upper ends relative to each of the plurality of second bottom surfaces.

10. Each of the plurality of first fracture surfaces has a first positioning groove, and the first positioning groove extends to the first bottom surface. Each of the aforementioned plurality of second fracture surfaces has a second positioning groove, and the second positioning groove extends to the second bottom surface. Each of the plurality of reflective sheets has a bent portion corresponding to each of the plurality of first positioning grooves and each of the plurality of second positioning grooves, Each of the aforementioned bent portions is located within each of the aforementioned multiple first positioning grooves and each of the aforementioned multiple second positioning grooves, and is exposed from between each of the aforementioned multiple first wall portions and each of the aforementioned multiple second wall portions. The reflective structure according to claim 5, characterized in that each of the plurality of bent portions has a gap between it and each of the plurality of first wall portions and each of the plurality of second wall portions.

11. Each of the aforementioned plurality of first wall portions further has a first upper end facing each of the aforementioned plurality of first bottom surfaces, Each of the aforementioned plurality of second wall portions further has a second upper end facing each of the aforementioned plurality of second bottom surfaces, Each of the aforementioned multiple bent portions has an upper end located between each of the aforementioned multiple first upper ends and each of the aforementioned multiple second upper ends, The reflective structure according to claim 10, characterized in that the height of each of the plurality of upper ends relative to each of the plurality of first bottom surfaces is smaller than the height of each of the plurality of first upper ends relative to each of the plurality of first bottom surfaces, and the height of each of the plurality of upper ends relative to each of the plurality of second bottom surfaces is smaller than the height of each of the plurality of second upper ends relative to each of the plurality of second bottom surfaces.

12. The reflective structure according to claim 5, characterized in that each of the plurality of light source grooves has an opposing light emission port and a bottom opening, each of the plurality of reflective sheets has a gap between each of the plurality of first wall portions and each of the plurality of second wall portions, and each of the plurality of reflective sheets has a bent portion and an extended portion, each of the plurality of bent portions is installed between each of the plurality of first wall portions and each of the plurality of second wall portions, each of the plurality of extended portions is connected to the plurality of bent portions and each of the plurality of bottom openings.

13. The reflective structure according to claim 2, characterized in that the first wall portion and the second wall portion, which are separated from each other, form notches in the cross section, and each of the plurality of notches further extends to at least one adjacent to the plurality of cross section walls of the plurality of reflective walls.

14. Each of the aforementioned plurality of first wall portions has a first fracture side, Each of the aforementioned plurality of second wall portions has a second fracture side, Each of the aforementioned plurality of first fracture sides and each of the aforementioned plurality of second fracture sides faces each other and is separated from each other. Each of the plurality of first fracture sides has a first light-shielding portion that protrudes toward each of the plurality of second fracture sides, The reflective structure according to claim 1, characterized in that each of the plurality of second fracture sides has a first recess that structurally complements each of the plurality of first light-shielding portions.

15. The reflective structure according to claim 14, characterized in that each of the plurality of second fracture sides further has a second light-shielding portion, each of the plurality of second light-shielding portions protrudes toward each of the plurality of first fracture sides, and each of the plurality of first fracture sides further has a second recess that complements each of the plurality of second light-shielding portions.

16. The reflective structure according to claim 1, characterized in that the plurality of reflective walls further comprises a plurality of first reflective walls and a plurality of second reflective walls, the plurality of first reflective walls are connected to each other and extend along a first linear direction, the plurality of second reflective walls are connected to each other and extend along a second linear direction different from the first linear direction, at least one of the plurality of first reflective walls has the cross section, and at least one of the plurality of second reflective walls has the cross section.

17. The reflective structure according to claim 1, characterized in that the plurality of reflective walls further comprises a plurality of first reflective walls and a plurality of second reflective walls, the plurality of first reflective walls are connected to each other and extend along a first linear direction, the plurality of second reflective walls are connected to each other and extend along a second linear direction different from the first linear direction, and at least a plurality of the plurality of first reflective walls have the cross section, or at least a plurality of the plurality of second reflective walls have the cross section.

18. The reflective structure according to claim 1, wherein each of the plurality of first wall portions has a first fracture surface, each of the plurality of first fracture surfaces is toward each of the plurality of second wall portions, each of the plurality of second wall portions has a second fracture surface that is toward each of the plurality of first fracture surfaces, and each of the plurality of first fracture surfaces is substantially parallel to each of the plurality of second fracture surfaces.

19. circuit board and A plurality of light-emitting elements are placed on the surface of the substrate, A main body having multiple light source grooves and multiple reflective walls, and a reflective structure installed on the surface thereof, A backlight module comprising, A backlight module characterized in that each of the plurality of reflective walls surrounds the plurality of light source grooves and has a plurality of section walls, each of the plurality of section walls has a first wall portion and a second wall portion separated from each other, and the main body is divided into a first part and a second part separated from each other by the plurality of section walls.

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