Light emitting module

Abstract

A light-emitting module comprises a base, a light guide sheet, a circuit board, a light-emitting unit and a diaphragm. The base comprises a substrate and a first retaining wall. The first retaining wall is arranged on the side edge of the substrate. The light guide sheet is arranged on the substrate and comprises a light emitting area and a light uniformizing area. The light emitting region is adjacent to the first retaining wall. At least one part of the circuit board is arranged on the light equalizing area. The light-emitting unit is arranged on the surface, facing the light guide sheet, of the circuit board. Light emitted by the light emitting unit enters the light equalizing area and is emitted from the light emitting area. The diaphragm is arranged on the light guide sheet and the circuit board. The diaphragm has a first region and a second region. The light transmittance of the first area is larger than that of the second area.

Description

Technical Field

[0001] The present invention relates to the technical field of light emitting modules, and in particular to a light emitting module applicable to electronic products. Background Art

[0002] Light-emitting modules are widely used in various electronic products to improve the visual effects of the electronic products. However, existing light-emitting modules are prone to uneven brightness and lateral stray light, which makes it impossible for the electronic products to have good visual effects. Summary of the invention

[0003] In order to solve the above-mentioned technical problems, the present invention provides a light-emitting module, which includes a base, a light guide, a circuit board, a light-emitting unit and a diaphragm. The base includes a substrate and a first baffle. The first baffle is arranged on the side of the substrate. The light guide is arranged on the substrate and includes a light-emitting area and a light-distributing area. The light-emitting area is adjacent to the first baffle. At least a part of the circuit board is arranged on the light-distributing area. The light-emitting unit is arranged on the surface of the circuit board facing the light guide. The light emitted by the light-emitting unit enters the light-distributing area and is emitted from the light-emitting area. The diaphragm is arranged on the light guide and the circuit board. The diaphragm has a first area and a second area. The transmittance of the first area is greater than the transmittance of the second area.

[0004] According to some embodiments of the present invention, the thickness of the first blocking wall is greater than the thickness of the light guide plate.

[0005] According to some embodiments of the present invention, the first area is located above the light exiting area, and the second area is located above the circuit board.

[0006] According to some embodiments of the present invention, the film further has a third area. The third area is located between the first area and the second area. The light transmittance of the third area is greater than the light transmittance of the second area and less than the light transmittance of the first area.

[0007] According to some embodiments of the present invention, the light-homogenizing region has no microstructures, and the light-emitting region has a plurality of microstructures, and the density of the microstructures gradually increases from the light-emitting region toward the first retaining wall.

[0008] According to some embodiments of the present invention, the film is disposed on the first retaining wall and covers the light guide plate and the circuit board.

[0009] According to some embodiments of the present invention, the light emitting module further includes a shading member, and the shading member is disposed above the first blocking wall.

[0010] According to some embodiments of the present invention, the width of the shading element is greater than the width of the first blocking wall.

[0011] According to some embodiments of the present invention, the light-emitting module further includes a second baffle wall extending from the end of the first baffle wall and forming a receiving space with the first baffle wall and the substrate. The light emitting area and the membrane portion of the light guide are received in the receiving space.

[0012] According to some embodiments of the present invention, the substrate is ring-shaped, and the light guide plate is disposed on at least a portion of the substrate. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic diagram of a light emitting module according to an embodiment of the present invention;

[0014] Figure 2 yes Figure 1 An exploded schematic diagram of a light emitting module;

[0015] Figure 3 yes Figure 1 A partially exploded schematic diagram of a light emitting module in area A;

[0016] Figure 4 yes Figure 1 A schematic cross-sectional view of the upper portion of the light emitting module along the section line BB;

[0017] Figure 5 yes Figure 4 A partial enlarged schematic diagram of a light emitting module in area C;

[0018] Figure 6 is a schematic diagram of a diaphragm according to another embodiment of the present invention;

[0019] Figure 7 is a partial cross-sectional schematic diagram of a light emitting module according to another embodiment of the present invention;

[0020] Figure 8 is a schematic cross-sectional view of an upper portion of a light emitting module according to another embodiment of the present invention;

[0021] Fig. 9 is a schematic diagram of a diaphragm according to yet another embodiment of the present invention;

[0022] Fig.10 is a schematic diagram of a light guide plate, a circuit board and a light emitting unit according to an embodiment of the present invention;

[0023] Fig.11 is a schematic diagram of a light guide plate, a circuit board and a light emitting unit according to another embodiment of the present invention;

[0024] Fig.12 FIG. 1 is a schematic diagram of a light emitting module installed in a notebook computer according to an embodiment of the present invention.

[0025]

Explanation of symbols

[0026] 100: Light emitting module

[0027] 11: Base

[0028] 110:Substrate

[0029] 111: Part 1

[0030] 112: Part 2

[0031] 113: Part 3

[0032] 114: Part 4

[0033] 115: First retaining wall

[0034] 116: Second retaining wall

[0035] 117: Accommodation space

[0036] 12: Light guide

[0037] 121: Light area

[0038] 1211: Bright surface

[0039] 122: Even light area

[0040] 123:Through hole

[0041] 124: Microstructure

[0042] 13: Circuit Board

[0043] 131: Second reflective layer

[0044] 132: Light shielding layer

[0045] 14: Light-emitting unit

[0046] 15: Diaphragm

[0047] 151: District 1

[0048] 152: District 2

[0049] 153: District 3

[0050] 16: Shading piece

[0051] 17: Shell

[0052] 18: First reflection layer

[0053] A: Area

[0054] BB:Hatch Line

[0055] C: Region

[0056] L: Laptop

[0057] H: Height of the first retaining wall

[0058] T: thickness of light guide

[0059] W1: Width of the shading element

[0060] W2: Width of the first retaining wall DETAILED DESCRIPTION

[0061] Various embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. The accompanying drawings are for illustration only and do not represent the actual size or quantity of the components. Furthermore, for the simplicity of the accompanying drawings, some details are not fully drawn. Directional terms in this article, such as up, down, left, right, inside, outside, side, center, are used to illustrate the orientation or position relationship of components in the accompanying drawings to simplify the description of the present invention, but are not used to limit the present invention.

[0062] See also Figure 1 and Figure 2 An embodiment of the present invention provides a light emitting module 100, which includes a base 11, a light guide sheet 12, a circuit board 13, a light emitting unit 14 and a film 15. Figures 2 to 4 The base 11 includes a substrate 110 and a first retaining wall 115, and the first retaining wall 115 is disposed on a side of the substrate 110. The light guide plate 12 is disposed on the substrate 110 and includes a light emitting area 121 and a light averaging area 122. The light emitting area 121 is adjacent to the first retaining wall 115. That is, the light emitting area 121 is located between the light averaging area 122 and the first retaining wall 115. Figure 4 , at least a portion of the circuit board 13 is disposed on the light-distributing area 122. The light-emitting unit 14 is disposed on the surface of the circuit board 13 facing the light guide plate 12. The light emitted by the light-emitting unit 14 enters the light-distributing area 122 of the light guide plate 12, and is emitted from the light-emitting area 121 of the light guide plate 12. Specifically, the light emitted by the light-emitting unit 14 is first uniformized in the light-distributing area 122, and then emitted from the light-emitting area 121, thereby preventing the light-emitting area 121 of the light guide plate 12 from having bright spots. Furthermore, the first blocking wall 115 can shield the light leakage from the side of the light-emitting area 121 of the light guide plate 12 away from the light-emitting unit 14 (i.e., lateral light leakage), so as to prevent the light-emitting module 100 from having stray light on the side away from the light-emitting unit 14. Please refer to Figure 4 and Figure 5 In one embodiment, the height H of the first retaining wall 115 is greater than the thickness T of the light guide sheet 12, so that the first retaining wall 115 can more effectively block the lateral light leakage of the light guide sheet 12. In addition, the first retaining wall 115 can also be used to limit the position of the light guide sheet 12 on the base 11, so that the light guide sheet 12 can be placed in the correct position during assembly, thereby increasing the assembly convenience of the light emitting module 100. In one embodiment, the first retaining wall 115 can be integrally formed with the substrate 110.

[0063] See also Figure 3The film 15 is disposed on the light guide plate 12 and the circuit board 13. The film 15 has a first area 151 and a second area 152. The light transmittance of the first area 151 is greater than the light transmittance of the second area 152. That is, the light transmittance of the second area 152 is less than the light transmittance of the first area 151. Figure 4 , the first area 151 is located above the light emitting area 121, and the second area 152 is located above the circuit board 13. Specifically, one side of the first area 151 is adjacent to the first retaining wall 115, the second area 152 is adjacent to one side of the first area 151 away from the first retaining wall 115, and the second area 152 covers the entire circuit board 13. In this embodiment, the second area 152 covers one side of the circuit board 13 away from the light emitting unit 14, so that the second area 152 can effectively visually blur one side of the circuit board 13 away from the light emitting unit 14, so that the light emitting module 100 presents a uniform visual effect. At this time, the transmittance of the second area 152 can be slightly greater than the transmittance of the circuit board 13, but is not limited thereto, as long as the second area 152 can visually blur the side of the circuit board 13. In another embodiment, a side of the circuit board 13 away from the light-emitting unit 14 is aligned with a side of the second area 152 away from the light-emitting unit 14, and the first area 151 has a gradually decreasing light transmittance in the direction toward the second area 152, so that the film 15 can also effectively visually blur the side of the circuit board 13 away from the light-emitting unit 14. The light transmittance of the second area 152 can be slightly greater than or equal to the light transmittance of the circuit board 13. In another embodiment, the second area 152 can also have a gradually decreasing light transmittance in the direction away from the first area 151.

[0064] In addition, in this embodiment, one side of the circuit board 13 away from the light-emitting unit 14 is aligned with one side of the light-homogenizing area 122 adjacent to the light-emitting area 121, and the projection of the second area 152 of the film 15 on the light guide plate 12 covers the entire light-homogenizing area 122 of the light guide plate 12 and a portion of the light-emitting area 121 adjacent to the light-homogenizing area 122, so that the second area 152 can effectively visually blur the side of the circuit board 13 away from the light-emitting unit 14. In another embodiment, the side of the circuit board 13 away from the light-emitting unit 14 can be set in the light-homogenizing area 122, and the projection of the second area 152 of the film 15 on the light guide plate 12 only covers the entire light-homogenizing area 122 of the light guide plate 12, so that the second area 152 can also effectively visually blur the side of the circuit board 13 away from the light-emitting unit 14. In other embodiments, the area and / or transmittance of the first area 151 and the second area 152 may be adjusted according to actual visual effects required, and / or the first area 151 and / or the second area 152 may be designed to have a single transmittance or a gradient transmittance.

[0065] See also Figure 6In one embodiment, the film 15 further has a third area 153. The third area 153 is located between the first area 151 and the second area 152. The light transmittance of the third area 153 is greater than the light transmittance of the second area 152, and less than the light transmittance of the first area 151. Such a design can make the light emitting module 100 have a visual effect of gradient light emission. Figure 8 , the third area 153 covers one side of the circuit board 13 away from the light-emitting unit 14, so as to visually blur the side of the circuit board 13 away from the light-emitting unit 14. In another embodiment, the boundary between the second area 152 and the third area 153 may be aligned with the side of the circuit board 13 away from the light-emitting unit 14. The light transmittance of the second area 152 may be slightly greater than or equal to the light transmittance of the circuit board 13. In one embodiment, the first area 151 and / or the third area 153 may have a gradually decreasing light transmittance in a direction toward the second area 152.

[0066] See also Figure 3 , the light emitting area 121 of the light guide plate 12 is provided with a plurality of microstructures 124, while the light averaging area 122 of the light guide plate 12 is not provided with the microstructures 124. In this embodiment, the microstructures 124 are dot-shaped. In other embodiments, the microstructures 124 may be linear, honeycomb-shaped, or other regular or irregular shapes. The plurality of microstructures 124 are used to guide the light in the light emitting area 121 upward, so as to leave from the light emitting surface 1211 of the light guide plate 12 and form a plurality of light spots. The film 15 can blur the boundaries of the plurality of light spots so that the light emitting module 100 presents a uniform light effect. In addition, please refer to Figure 4 The film 15 can also shield light leakage between the side edge of the circuit board 13 close to the light-emitting unit 14 and the base 11 .

[0067] See also Figure 3 In one embodiment, the density of the microstructures 124 gradually increases from the light emitting area 121 toward the first blocking wall 115. That is, the microstructures 124 in the portion of the light emitting area 121 closer to the light emitting unit 14 are relatively sparse, and the microstructures 124 in the portion of the light emitting area 121 farther from the light emitting unit 14 are relatively dense, so that the brightness of the portion of the light emitting area 121 closer to the light emitting unit 14 and the brightness of the portion of the light emitting area 121 farther from the light emitting unit 14 can be roughly the same, so that the light emitting module 100 presents a more uniform light effect.

[0068] Furthermore, please see Figure 3 In the portion of the light emitting area 121 far from the light emitting unit 14, the light spots generated by the denser microstructures 124 overlap each other, so the boundaries of the light spots are not obvious. In the portion of the light emitting area 121 close to the light emitting unit 14, the boundaries of the light spots generated by the sparser microstructures 124 are more obvious. Figure 3 The second area 152 of the diaphragm 15 shown, or Figure 6The third region 153 of the film 15 shown can effectively blur the boundary of the light spot generated by the relatively sparse microstructures 124, so that the light-emitting module 100 presents a more uniform light effect.

[0069] See also Figure 4 In this embodiment, the film 15 only covers the light guide plate 12 and the circuit board 13, and the effect of the film 15 described above can be achieved. Figure 7 In another embodiment, the film 15, in addition to covering the light guide 12 and the circuit board 13, is also disposed on the first retaining wall 115 to prevent the light guide 12 from leaking sideways from the circuit board 13. Figure 4 The gap between the film 15 and the first retaining wall 115 is shown to be leaking. In one embodiment, the film 15 is made of a transparent material or a semi-transparent material, and the film 15 is printed to have a first area 151, a second area 152 and / or a third area 153. The material of the film 15 can be polyethylene terephthalate (PET), but is not limited thereto.

[0070] See also Figure 2 and Figure 3 In one embodiment, the light emitting module 100 further includes a light shielding member 16. Figure 5 and Figure 7 The light shielding member 16 is disposed above the first baffle 115 to further shield the lateral stray light of the light guide plate 12. Figure 5 , the shading member 16 is directly disposed on the first retaining wall 115. In another embodiment, please refer to Figure 7 , the shading member 16 is disposed on the film 15 and corresponds to the first retaining wall 115. Figure 5 and Figure 7 In one embodiment, the width W1 of the light shielding member 16 may be greater than the width W2 of the first blocking wall 115. Specifically, a side edge of the light shielding member 16 away from the light emitting unit 14 is aligned with a side edge of the first blocking wall 115 away from the light emitting unit 14, and the projection of the light shielding member 16 on the base 11 partially overlaps with the projection of the light guide sheet 12 on the base 11, thereby improving the shielding effect of the light shielding member 16 on the lateral stray light of the light guide sheet 12. In one embodiment, the light shielding member 16 may be a light shielding strip, a light shielding layer, or a light shielding coating.

[0071] See also Figure 8In one embodiment, the light emitting module 100 further includes a second baffle 116, but does not include the light shielding member 16. The second baffle 116 extends from the end of the first baffle 115, and forms a receiving space 117 with the first baffle 115 and the substrate 110. The light emitting area 121 of the light guide sheet 12 and the membrane sheet 15 are partially received in the receiving space 117. The second baffle 116 is used to further shield the lateral stray light of the light guide sheet 12. In one embodiment, the second baffle 116 can be integrally formed with the first baffle 115. In another embodiment, the substrate 110, the first baffle 115 and the second baffle 116 can be integrally formed.

[0072] See also Figure 2 In some embodiments, the substrate 110 may be annular, and the light guide sheet 12 may be disposed on at least a portion of the substrate 110. Specifically, the substrate 110 is composed of a first portion 111, a second portion 112, a third portion 113, and a fourth portion 114 connected in sequence, and the fourth portion 114 is connected to the first portion 111. The first portion 111 is opposite to the third portion 113. The second portion 112 is opposite to the fourth portion 114. The first portion 111 and the third portion 113 may be flat plates, and the second portion 112 and the fourth portion 114 may be curved plates, but are not limited thereto, and may be designed into different shapes according to actual needs. Please refer to Figure 2 In one embodiment, the light guide sheet 12 is disposed on the first portion 111, the second portion 112 and the fourth portion 114 of the substrate 110, so that the upper side, the left side and the right side of the light emitting module 100 all present a light emitting effect. At this time, the first retaining wall 115, the circuit board 13, the light emitting unit 14, the film 15 and / or the light shielding member 16 can be disposed above the first portion 111, the second portion 112 and the fourth portion 114 of the substrate 110 corresponding to the light guide sheet 12. Please refer to Fig. 9 In one embodiment, the second region 152 of the film 15 can extend to opposite sides of the first region 151 to form a U-shape, so that the light-emitting module 100 can present different light-emitting effects. Fig. 9 The dotted line disclosed in the figure indicates the boundary between the first area 151 and the second area 152, rather than an actual line. In another embodiment, the light guide sheet 12 is only disposed on the first portion 111 of the substrate 110, so that the upper side of the light-emitting module 100 presents a light-emitting effect. In this case, the first retaining wall 115, the circuit board 13, the light-emitting unit 14, the film 15 and / or the light-shielding member 16 can be disposed only above the first portion 111 of the substrate 110 corresponding to the light guide sheet 12. In this embodiment, the second area 152 of the film 15 can also extend to the opposite sides of the first area 151 to form a U-shape, so that the light-emitting module 100 presents different light-emitting effects.

[0073] In other embodiments, the light guide sheet 12 is disposed on the first portion 111, the second portion 112, the third portion 113 and the fourth portion 114 of the substrate 110, so that the upper side, the left side, the right side and the lower side of the light emitting module 100 all present a light emitting effect. That is, the light guide sheet 12 surrounds the substrate 110, so that the light emitting module 100 presents a ring-shaped light emitting effect. In this case, the first retaining wall 115, the circuit board 13, the light emitting unit 14, the film 15 and / or the light shielding member 16 can be disposed on the first portion 111, the second portion 112, the third portion 113 and the fourth portion 114 of the substrate 110 corresponding to the light guide sheet 12. Please refer to Figure 2 In one embodiment, the light guide sheet 12, the circuit board 13, the film 15 and the light shielding member 16 may be flexible and bendable according to the curvature of the second portion 112 and the third portion 113 of the base 11. In one embodiment, the circuit board 13 may be a flexible circuit board (FPC).

[0074] See also Figure 1 , Figure 2 and Figure 4 In one embodiment, the light emitting module 100 further includes a shell 17 for accommodating and protecting the base 11, the light guide 12, the circuit board 13 provided with the light emitting unit 14, the film 15, and / or the shading member 16. The shell 17 is a transparent shell or a translucent shell. In one embodiment, the shell 17 is a translucent black shell. When the light emitting unit 14 does not emit light, the appearance of the light emitting module 100 appears black, and the user cannot see all the components in the shell 17. When the light emitting unit 14 emits light, the shell 17 can further visually blur the boundary of the circuit board 13 and the boundary of the light spot generated by the microstructure 124, so that the light emitting module 100 presents a better visual effect.

[0075] See also Figure 2 and Figure 4 , when the shading member 16 is a shading strip, it can serve as a limiting structure of the housing 17. In the manufacturing process, the light guide 12, the circuit board 13 provided with the light-emitting unit 14, the diaphragm 15 and the shading member 16 are first assembled on the base 11 in sequence, and then the assembled base 11 is pushed into the housing 17. The shading member 16 can be used to ensure that the positional relationship between the housing 17 and the assembled base 11 is desired or expected. That is, the shading member 16 can be used to ensure that the assembled base 11 is pushed to the desired or expected position in the housing 17. The shading member 16 can be used to prevent the assembled base 11 and the housing 17 from colliding due to shaking, thereby generating abnormal noise. The shading member 16 can be a shading strip made of a hard material or a flexible material.

[0076] In the case where the shading member 16 is a shading strip made of a flexible material, since the shading member 16 is deformable, the assembled base 11 and the housing 17 can be interfered with each other to improve the structural stability of the light emitting module 100. Furthermore, since the shading member 16 has a buffering property, it can more effectively prevent the light emitting module 100 from generating abnormal sounds due to shaking. The flexible material may include, but is not limited to, silicone, rubber or polyethylene foam.

[0077] See also Figure 8 In one embodiment, the light emitting module 100 further includes a first reflective layer 18. The first reflective layer 18 is disposed between the substrate 110 and the light guide plate 12, and is used to reflect light leaving the surface of the light guide plate 12 close to the substrate 110 back to the light guide plate 12, so as to improve the light effect. The projection of the first reflective layer 18 on the substrate 110 can completely overlap with the projection of the light guide plate 12 on the substrate 110, so that the first reflective layer 18 can reflect all light leaving the surface of the light guide plate 12 close to the substrate 110 back to the light guide plate 12. In one embodiment, the first reflective layer 18 can be a coating or a film made of a reflective material.

[0078] See also Figure 8 In one embodiment, the light emitting module 100 may further include a second reflective layer 131. The second reflective layer 131 is disposed on the surface of the circuit board 13 close to the light guide plate 12, and is used to reflect the light leaving the surface of the light guide plate 12 close to the circuit board 13 back to the light guide plate 12 to improve the light effect. In one embodiment, the light emitting module 100 may further include a light shielding layer 132. The light shielding layer 132 is disposed on the surface of the circuit board 13 away from the light guide plate 12, and is used to absorb or shield the light leaving the surface of the light guide plate 12 close to the circuit board 13 to prevent affecting the visual effect of the light emitting module 100. In another embodiment, the light shielding layer 132 is disposed on the surface of the circuit board 13 close to the light guide plate 12. In other embodiments, the light emitting module 100 may include both the second reflective layer 131 and the light shielding layer 132. In one embodiment, the second reflective layer 131 may be a coating or film made of a reflective material, and the light shielding layer 132 may be a coating or film made of an opaque material.

[0079] See also Fig.10 In the above embodiment, the light emitting unit 14 is disposed adjacent to the side of the light averaging area 122 of the light guide plate 12. This arrangement simplifies the manufacturing process of the light guide plate 12 and facilitates the assembly process of the circuit board 13 and the light guide plate 12. Fig.11In another embodiment, the light emitting unit 14 can be accommodated in the through hole 123 of the light emitting area 122 of the light guide 12. In one embodiment, the light emitting area 122 of the light guide 12 is provided with a plurality of through holes 123, each through hole 123 accommodates one light emitting unit 14, and the size of the through hole 123 can match the size of the light emitting unit 14. Such a configuration facilitates the alignment of the circuit board 13 during assembly, and makes the assembled circuit board 13 more stable. In another embodiment, each through hole 123 can accommodate more than two light emitting units 14. In other embodiments, the light emitting area 122 of the light guide 12 is provided with only one through hole 123 to accommodate all the light emitting units 14.

[0080] The light emitting module 100 can be mounted on various electronic products. Fig.12 In one embodiment, the light emitting module 100 is disposed on the notebook computer L. Specifically, a side of the light emitting module 100 close to the light emitting unit 14 is assembled on a side of the notebook computer L.

[0081] Although the present invention is described in detail above with the aforementioned embodiments, the protection scope of the present invention is not limited by the aforementioned embodiments. Any modification made by those skilled in the art to the technical solutions of the aforementioned embodiments within the principle of the present invention, or any equivalent replacement made to some of the technical features of the aforementioned embodiments, are all included in the protection scope of the present invention. The protection scope of the present invention shall be subject to the claims.

Claims

1. A light emitting module, characterized in that: Include: The base comprises a substrate and a first retaining wall, wherein the first retaining wall is arranged on one side of the substrate; A light guide sheet is disposed on the substrate and comprises a light emitting area and a light averaging area, wherein the light emitting area is adjacent to the first baffle wall; A circuit board, at least a portion of which is disposed on the light-homogenizing area; A light emitting unit is disposed on a surface of the circuit board facing the light guide plate, and light emitted by the light emitting unit enters the light averaging area and is emitted from the light emitting area; and The diaphragm is arranged on the light guide plate and the circuit board. The diaphragm has a first area and a second area. The light transmittance of the first area is greater than the light transmittance of the second area.

2. The light emitting module according to claim 1, characterized in that: The height of the first blocking wall is greater than the thickness of the light guide plate.

3. The light emitting module according to claim 1, characterized in that: The first area is located above the light exiting area, and the second area is located above the circuit board.

4. The light emitting module according to claim 3, characterized in that: The film further has a third area, which is located between the first area and the second area, and the light transmittance of the third area is greater than the light transmittance of the second area and less than the light transmittance of the first area.

5. The light emitting module according to claim 1, characterized in that: The light-evening area has no microstructure, and the light-exiting area has a plurality of microstructures, and the density of the plurality of microstructures gradually increases from the light-exiting area toward the first blocking wall.

6. The light emitting module according to claim 1, characterized in that: The film is disposed on the first baffle wall and covers the light guide sheet and the circuit board.

7. The light emitting module according to claim 1, characterized in that: It also includes a shading member, which is arranged above the first baffle wall.

8. The light emitting module according to claim 7, characterized in that: The width of the shading element is greater than the width of the first blocking wall.

9. The light emitting module according to claim 1, characterized in that: It also includes a second baffle wall, which extends from the end of the first baffle wall and forms a containing space with the first baffle wall and the substrate. The light emitting area of ​​the light guide sheet and the film are partially contained in the containing space.

10. The light emitting module according to claim 1, characterized in that: The substrate is ring-shaped, and the light guide sheet is arranged on at least a portion of the substrate.

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