Linear light source module

Abstract

A linear light source module includes a substrate and a plurality of light emitting elements. The substrate defines a first direction and a second direction perpendicular to the first direction. The light emitting elements are disposed on the substrate and spaced apart from each other along the first direction. Each of the light emitting elements includes a light emitting unit and a light diffusion layer. The light emitting unit has a top light emitting surface, two first side light emitting surfaces that are opposite to each other in the first direction, and two second side light emitting surfaces that are opposite to each other in the second direction. The top light emitting surface and the two second side light emitting surfaces are covered by the light diffusion layer, and the two first side light emitting surfaces are exposed from the light diffusion layer. Therefore, an uniform light distribution can be produced, so as to avoid the generation of bright spots and dark zones.

Description

[Technical Field]

[0001] This invention relates to a light source module, and more particularly to a linear light source module capable of generating uniform light distribution. [Previous Technology]

[0002] Light Emitting Diodes (LEDs) have many advantages, and therefore their applications are quite extensive. Currently, various products using LED light sources can be seen in daily life.

[0003] To construct a linear light source, the existing technology involves sequentially mounting multiple LED elements onto a substrate and placing additional optical elements, such as light guide plates and diffuser plates, above the multiple LED elements to improve brightness and light uniformity. However, a certain distance must be maintained between the LED elements and the diffuser plate to ensure that the light can be evenly distributed. This is not only detrimental to size reduction, but also the structural components (such as spacers) existing between the LED elements and the diffuser plate may block or interfere with the light from the LED elements, resulting in uneven brightness, i.e., the generation of bright spots or dark areas. [Summary of the Invention]

[0004] The present invention provides a linear light source module to address the shortcomings of the prior art, thereby solving the technical problem that light is concentrated in the area near the light-emitting element to form a bright spot, and that there are dark areas between the light-emitting elements.

[0005] To solve the above-mentioned technical problems, one of the technical solutions adopted by the present invention is to provide a linear light source module, which includes a substrate and a plurality of light-emitting elements. The substrate defines a first direction and a second direction perpendicular to the first direction, and the plurality of light-emitting elements are disposed on the substrate and arranged at intervals along the first direction. In the present invention, each light-emitting element includes a light-emitting unit and a light-diffusing layer. The light-emitting unit has a top light-emitting surface, two first side light-emitting surfaces disposed opposite to each other in the first direction, and two second side light-emitting surfaces disposed opposite to each other in the second direction. The light-diffusing layer covers the top light-emitting surface and the two second side light-emitting surfaces, but does not cover the two first side light-emitting surfaces.

[0006] In a feasible or preferred embodiment of the present invention, the spacing between two adjacent light-emitting elements is in the range of 1 mm to 20 mm.

[0007] In a feasible or preferred embodiment of the present invention, the thickness of the light diffusion layer is in the range of 30 μm to 150 μm. Furthermore, the material of the light diffusion layer contains titanium dioxide particles, and the content of the titanium dioxide particles is in the range of 10 wt% to 60 wt% based on a total weight of 100 wt% of the material of the light diffusion layer.

[0008] In a feasible or preferred embodiment of the present invention, each of the light-emitting elements includes a wavelength conversion layer disposed between the light-emitting unit and the light diffusion layer, and the wavelength conversion layer covers the top light-emitting surface, the two first side light-emitting surfaces and the two second side light-emitting surfaces.

[0009] In a feasible or preferred embodiment of the present invention, the thickness of the wavelength conversion layer is in the range of 30 μm to 150 μm.

[0010] In a feasible or preferred embodiment of the present invention, each of the light-emitting elements includes a light-transmitting layer disposed between the light diffusion layer and the wavelength conversion layer, and the light-transmitting layer is located above the top light-emitting surface.

[0011] In a feasible or preferred embodiment of the present invention, each of the light-emitting elements includes a light-transmitting layer disposed between the light-emitting unit and the light-diffusing layer.

[0012] In a feasible or preferred embodiment of the present invention, the light-transmitting layer covers the top light-emitting surface, the two first side light-emitting surfaces and the two second side light-emitting surfaces.

[0013] In a feasible or preferred embodiment of the present invention, the light-transmitting layer fills the gap between the light-diffusing layer and the two second side emitting surfaces, and there is no gap between the light-diffusing layer and the top emitting surface.

[0014] In a feasible or preferred embodiment of the present invention, the light-transmitting layer contains diffusing particles.

[0015] In general, the linear light source module provided by the present invention, by means of "multiple light-emitting elements disposed on the substrate and arranged at intervals along the length of the substrate", "light diffusion layer covering the top light-emitting surface of the light-emitting unit and two opposite side light-emitting surfaces in the width direction of the substrate" and "light diffusion layer not covering the two opposite side light-emitting surfaces of the light-emitting unit in the length direction of the substrate", can generate a more uniform light distribution while reducing the volume, and avoid the formation of bright spots and dark areas.

[0016] Furthermore, since the light-emitting element adopts the above-mentioned partial encapsulation design, the linear light source module of the present invention can generate a uniform light distribution without relying on additional optical elements (such as light guide plates and diffuser plates). On this basis, the module size can be miniaturized, and the number of light-emitting elements 2 can be reduced.

[0017] To further understand the features and technical content of the present invention, please refer to the following detailed description and drawings of the present invention. However, the drawings provided are for reference and illustration only and are not intended to limit the present invention.

Implementation Method

[0018] The following specific embodiments illustrate the implementation of the "linear light source module" disclosed in this invention. Those skilled in the art can understand the advantages and effects of this invention from the content disclosed in this specification. This invention can be implemented or applied through other different specific embodiments, and various details in this specification can also be modified and changed based on different viewpoints and applications without departing from the concept of this invention. In addition, the accompanying drawings of this invention are only simple schematic illustrations and are not depictions based on actual dimensions, as stated in advance. The following embodiments will further describe the relevant technical content of this invention in detail, but the disclosed content is not intended to limit the scope of protection of this invention.

[0019] It should be understood that although terms such as “first,” “second,” and “third” may be used herein to describe various components or signals, these components or signals should not be limited by these terms. These terms are primarily used to distinguish one component from another, or one signal from another. In addition, the term “or” as used herein may include, as appropriate, any combination of any one or more of the associated listed items.

[0020] Unless otherwise defined, the terms used herein have the same meaning as commonly understood by those skilled in the art. Materials involved in the embodiments are commercially available or prepared according to prior art, unless otherwise specified. Process methods involved in the embodiments are conventionally used in the art, unless otherwise specified.

[0021] [First Embodiment]

[0022] Referring to Figures 1 to 3, a first embodiment of the present invention provides a linear light source module Z, which includes a substrate 1 and a plurality of light-emitting elements 2. The substrate 1 can define a first direction L1 and a second direction L2 perpendicular to the first direction L1. The first direction L1 is the length direction of the substrate 1, and the second direction L2 is the width direction of the substrate 1. The plurality of light-emitting elements 2 are disposed on the substrate 1 and arranged at intervals along the first direction L1, and each light-emitting element 2 includes a light-emitting unit 21 and a light-diffusing layer 22 for dispersing the emitted light of the light-emitting unit 21; the emission colors of each light-emitting element 2 can be the same or different.

[0023] It is worth noting that in each light-emitting element 2, the light diffusion layer 22 partially covers the light-emitting unit 21, that is, the light diffusion layer 22 does not completely cover all the light-emitting surfaces of the light-emitting unit 21. Specifically, the light-emitting unit 21 has a top light-emitting surface 211, two first side light-emitting surfaces 212 arranged opposite to each other in the first direction L1, and two second side light-emitting surfaces 213 arranged opposite to each other in the second direction L2. The top light-emitting surface 211 and the two second side light-emitting surfaces 213 are covered by the light diffusion layer 22, while the two first side light-emitting surfaces 212 are not covered by the light diffusion layer 22. Therefore, the emitted light from the top light-emitting surface 211 and the two second side light-emitting surfaces 213 will not be concentrated only in the area close to the light-emitting unit 21, but a portion of it will be emitted along the first direction L1 under the action of the light diffusion layer 22, so that the light is evenly distributed to the area away from the light-emitting unit 21, thereby achieving the effect of eliminating dark areas.

[0024] Due to the adoption of the above-mentioned partially encapsulated light-emitting element 2, the linear light source module Z can generate a uniform light distribution without relying on additional optical elements (such as light guide plates and diffuser plates). On this basis, the module size can be miniaturized, and the number of light-emitting elements 2 can be reduced. With the reduction of the number of light-emitting elements 2, the spacing between two adjacent light-emitting elements 2 can be adjusted within the range of 1 mm to 20 mm depending on the module design.

[0025] Furthermore, the substrate 1 can be a conductive substrate, which may include multiple contact pads and multiple conductive structures (such as vias and wiring). The light-emitting element 2 can be a flip-chip CSP (Chip Scale Package) element, wherein there are no gaps between the top light-emitting surface 211, the two second side light-emitting surfaces 213, and the light diffusion layer 22 of the light-emitting unit 21. In practical applications, a visible light emitting diode can be used as the light-emitting unit 21. The light diffusion layer 22 can be formed by spraying, printing, dispensing, or molding, and the thickness of the light diffusion layer 22 can be in the range of 30 μm to 150 μm. In addition, the material of the light diffusion layer 22 may contain titanium dioxide particles; and based on the total weight of the material of the light diffusion layer 22 being 100 wt%, the content of titanium dioxide particles can be in the range of 10 wt% to 60 wt%.

[0026] It should be noted that the thickness of the light diffusion layer 22 and the amount of titanium dioxide particles it contains can be adjusted according to requirements. For example, the thickness of the light diffusion layer 22 on the top emitting surface 211 of the light-emitting unit 21 or the content of titanium dioxide particles can be increased to reduce the brightness of the light-emitting surface 201 (front emitting surface) of the light-emitting element 2. Alternatively, the thickness of the light diffusion layer 22 on the second side emitting surface 213 of the light-emitting unit 21 or the content of titanium dioxide particles can be increased to reduce the brightness of the light-emitting surface 202 (side emitting surface) of the light-emitting element 2.

[0027] In this embodiment, the thickness of the light diffusion layer 22 can be 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 110 μm, 120 μm, 130 μm, 140 μm, or 150 μm. The content of titanium dioxide particles in the light diffusion layer 22 can be 10 wt%, 15 wt%, 20 wt%, 25 wt%, 30 wt%, 35 wt%, 40 wt%, 45 wt%, 50 wt%, 55 wt%, or 60 wt%.

[0028] As shown in Figures 2 and 3, in the linear light source module Z of the present invention, each light-emitting element 2 may further include a wavelength conversion layer 23 to convert the light from the light-emitting unit 21 into emitted light of different wavelengths. Specifically, the wavelength conversion layer 23 is disposed between the light-emitting unit 21 and the light diffusion layer 22, and the light-emitting unit 21, the light diffusion layer 22, and the wavelength conversion layer 23 are tightly integrated without gaps. In addition, the wavelength conversion layer 23 covers the top light-emitting surface 211, the two first side light-emitting surfaces 212, and the two second side light-emitting surfaces 213 of the light-emitting unit 21. In practical applications, the wavelength conversion layer 23 can be formed by spraying, printing, dispensing, or molding, and the thickness of the wavelength conversion layer 23 can be in the range of 30 μm to 150 μm. In addition, the wavelength conversion layer 23 may contain one or more phosphors, and the phosphors are distributed substantially uniformly in the wavelength conversion layer 23. The wavelength conversion layer 23 may be composed of a single layer or may be composed of multiple laminated layers.

[0029] It should be noted that the thickness of the wavelength conversion layer 23 can be adjusted according to requirements. For example, the thickness of the wavelength conversion layer 23 on the top emitting surface 211 of the light-emitting unit 21 can be increased to increase the lateral light emission intensity. In this embodiment, the thickness of the wavelength conversion layer 23 can be 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 110 μm, 120 μm, 130 μm, 140 μm, or 150 μm.

[0030] Referring to Figures 4 and 5, in the linear light source module Z of the present invention, each light-emitting element 2 may further include a light-transmitting layer 24 to increase the distance between the top light-emitting surface 211 of the light-emitting unit 21 and the light-diffusing layer 22. Specifically, the light-transmitting layer 24 is disposed between the light-diffusing layer 22 and the wavelength conversion layer 23, and the light-diffusing layer 22, the wavelength conversion layer 23, and the light-transmitting layer 24 are tightly integrated without gaps. In addition, the light-transmitting layer 24 is located above the top light-emitting surface 211 of the light-emitting unit 21 and allows light from the light-emitting unit 21 to pass through. Therefore, the light extraction efficiency and the lateral light intensity can be increased by adjusting the thickness of the light-transmitting layer 24. In practical applications, the light-transmitting layer 24 may be an optically transparent layer formed of highly transparent resin materials such as epoxy resin, acrylic resin, polycarbonate, or silicone.

[0031] [Second Embodiment]

[0032] Referring to Figures 6 and 7, and in conjunction with Figure 1, a second embodiment of the present invention provides a linear light source module Z, which includes a substrate 1 and a plurality of light-emitting elements 2. The substrate 1 can define a first direction L1 and a second direction L2 perpendicular to the first direction L1. The plurality of light-emitting elements 2 are disposed on the substrate 1 and arranged at intervals along the first direction L1, and each light-emitting element 2 includes a light-emitting unit 21 and a light-diffusing layer 22. The light-emitting unit 21 has a top light-emitting surface 211, two first side light-emitting surfaces 212 disposed opposite to each other in the first direction L1, and two second side light-emitting surfaces 213 disposed opposite to each other in the second direction L2. The light-diffusing layer 22 covers the top light-emitting surface 211 and the two second side light-emitting surfaces 213, and the two first side light-emitting surfaces 212 are not covered by the light-diffusing layer 22.

[0033] The difference between this embodiment and the first embodiment is that: in each light-emitting element 2, a light-transmitting layer 24 is disposed between the light-emitting unit 21 and the light-diffusing layer 22, and the light-emitting unit 21, the light-diffusing layer 22, and the light-transmitting layer 24 are tightly integrated without gaps. Specifically, the light-transmitting layer 24 fills the gap between the light-diffusing layer 22 and the two second side light-emitting surfaces 213 of the light-emitting unit 21, and there is no gap between the light-diffusing layer 22 and the top light-emitting surface 211 of the light-emitting unit 21.

[0034] The relevant technical details mentioned in the first embodiment are still valid in this embodiment, and will not be repeated here to reduce repetition. Similarly, the relevant technical details mentioned in this embodiment can also be applied to the first embodiment.

[0035] [Third Embodiment]

[0036] Referring to Figures 8 and 9, and in conjunction with Figure 1, a third embodiment of the present invention provides a linear light source module Z, which includes a substrate 1 and a plurality of light-emitting elements 2. The substrate 1 can define a first direction L1 and a second direction L2 perpendicular to the first direction L1. The plurality of light-emitting elements 2 are disposed on the substrate 1 and arranged at intervals along the first direction L1, and each light-emitting element 2 includes a light-emitting unit 21 and a light-diffusing layer 22. The light-emitting unit 21 has a top light-emitting surface 211, two first side light-emitting surfaces 212 disposed opposite to each other in the first direction L1, and two second side light-emitting surfaces 213 disposed opposite to each other in the second direction L2. The light-diffusing layer 22 covers the top light-emitting surface 211 and the two second side light-emitting surfaces 213, and the two first side light-emitting surfaces 212 are not covered by the light-diffusing layer 22.

[0037] The difference between this embodiment and the first embodiment is that: in each light-emitting element 2, a light-transmitting layer 24 is disposed between the light-emitting unit 21 and the light-diffusing layer 22, and the light-emitting unit 21, the light-diffusing layer 22, and the light-transmitting layer 24 are tightly integrated without gaps. Specifically, the light-transmitting layer 24 covers the top light-emitting surface 211, the two first side light-emitting surfaces 212, and the two second side light-emitting surfaces 213 of the light-emitting unit 21.

[0038] As shown in Figures 10 and 11, the light-transmitting layer 24 may contain diffusion particles 241 as needed to further improve light uniformity; the diffusion particles 241 may be aluminum oxide (Al2O3), silicon dioxide (SiO2), titanium dioxide (TiO2) or any combination thereof, but are not limited thereto.

[0039] The relevant technical details mentioned in the above embodiments are still valid in this embodiment, and will not be repeated here to reduce repetition. Similarly, the relevant technical details mentioned in this embodiment can also be applied to the above embodiments.

[0040] [Beneficial Effects of the Embodiments]

[0041] The linear light source module provided by the present invention, by means of "multiple light-emitting elements disposed on the substrate and arranged at intervals along the length direction of the substrate", "light diffusion layer covering the top light-emitting surface of the light-emitting unit and two opposite side light-emitting surfaces in the width direction of the substrate" and "light diffusion layer not covering the two opposite side light-emitting surfaces of the light-emitting unit in the length direction of the substrate", can generate a more uniform light distribution while reducing the volume, and avoid forming bright spots and dark areas.

[0042] Furthermore, because the light-emitting element adopts the above-mentioned partial encapsulation design, the linear light source module of the present invention can generate a uniform light distribution without relying on additional optical elements (such as light guide plates and diffuser plates). On this basis, the module size can be miniaturized, and the number of light-emitting elements can be reduced.

[0043] The content disclosed above is only a preferred and feasible embodiment of the present invention, and is not intended to limit the scope of the patent application of the present invention. Therefore, all equivalent technical changes made using the contents of the present invention specification and drawings are included in the scope of the patent application of the present invention. [Simplified Explanation of the Diagram]

[0044] Figure 1 is a top view of the linear light source module of the present invention.

[0045] Figure 2 is a cross-sectional schematic diagram of section II-II of Figure 1, which shows the structure of the light-emitting element according to the first embodiment of the present invention from one viewpoint.

[0046] Figure 3 is a cross-sectional schematic diagram of section III-III of Figure 1, which shows the structure of the light-emitting element according to the first embodiment of the present invention from another perspective.

[0047] Figure 4 is a cross-sectional schematic diagram of section II-II of Figure 1, which shows the structure of a variation of the light-emitting element according to the first embodiment of the present invention from one viewpoint.

[0048] Figure 5 is a cross-sectional schematic diagram of section III-III of Figure 1, which shows the structure of a variation of the light-emitting element according to the first embodiment of the present invention from another perspective.

[0049] Figure 6 is a cross-sectional schematic diagram of section II-II of Figure 1, which shows the structure of the light-emitting element according to the second embodiment of the present invention from one viewpoint.

[0050] Figure 7 is a cross-sectional schematic diagram of section III-III of Figure 1, which shows the structure of the light-emitting element according to the second embodiment of the present invention from another perspective.

[0051] Figure 8 is a cross-sectional schematic diagram of section II-II of Figure 1, which shows the structure of the light-emitting element according to the third embodiment of the present invention from one viewpoint.

[0052] Figure 9 is a cross-sectional schematic diagram of section III-III of Figure 1, which shows the structure of the light-emitting element according to the third embodiment of the present invention from another perspective.

[0053] Figure 10 is a cross-sectional schematic diagram of section II-II of Figure 1, which shows the structure of a variation of the light-emitting element according to the third embodiment of the present invention from one viewpoint.

[0054] Figure 11 is a cross-sectional schematic diagram of section III-III of Figure 1, which shows the structure of a variation of the light-emitting element according to the third embodiment of the present invention from another perspective.

Claims

1. A linear light source module, comprising: A substrate, defining a first direction and a second direction perpendicular to the first direction; The light-emitting elements are disposed on the substrate and arranged at intervals along the first direction. Each light-emitting element includes a light-emitting unit and a light-diffusing layer. The light-emitting unit has a top light-emitting surface, two first side light-emitting surfaces disposed opposite to each other in the first direction, and two second side light-emitting surfaces disposed opposite to each other in the second direction. The light-diffusing layer covers the top light-emitting surface and the two second side light-emitting surfaces, but does not cover the two first side light-emitting surfaces.

2. The linear light source module as described in claim 1, wherein, The spacing between two adjacent light-emitting elements is in the range of 1 mm to 20 mm.

3. The linear light source module as described in claim 1, wherein, The thickness of the light diffusion layer is in the range of 30 μm to 150 μm; wherein the material of the light diffusion layer contains titanium dioxide particles, and the content of titanium dioxide particles is in the range of 10 wt% to 60 wt% based on the total weight of the material of the light diffusion layer being 100 wt%.

4. The linear light source module as described in claim 1, wherein, Each of the light-emitting elements includes a wavelength conversion layer disposed between the light-emitting unit and the light diffusion layer, and the wavelength conversion layer covers the top light-emitting surface, the two first side light-emitting surfaces and the two second side light-emitting surfaces.

5. The linear light source module as described in claim 4, wherein, The thickness of the wavelength conversion layer is in the range of 30 μm to 150 μm.

6. The linear light source module as described in claim 4, wherein, Each of the light-emitting elements includes a light-transmitting layer disposed between the light diffusion layer and the wavelength conversion layer, and the light-transmitting layer is located above the top light-emitting surface.

7. The linear light source module as described in claim 1, wherein, Each of the light-emitting elements includes a light-transmitting layer disposed between the light-emitting unit and the light-diffusing layer.

8. The linear light source module as described in claim 7, wherein, The light-transmitting layer covers the top light-emitting surface, the two first side light-emitting surfaces, and the two second side light-emitting surfaces.

9. The linear light source module as described in claim 7, wherein, The light-transmitting layer fills the gap between the light-diffusing layer and the two second side emitting surfaces, and there is no gap between the light-diffusing layer and the top emitting surface.

10. The linear light source module as described in claim 8 or 9, wherein, The light-transmitting layer contains diffusing particles.

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