Light source module

Abstract

The utility model provides a light source module which comprises a circuit board, a light-emitting element, a packaging layer and a plurality of micro-cavities. The light-emitting element is arranged on the substrate surface of the circuit board and is electrically connected with the circuit board. The packaging layer directly covers the surface of the substrate and the light-emitting element, and is provided with a first surface connected with the surface of the substrate. The plurality of microcavities are embedded in the encapsulation layer. At least a part of the micro-cavities are arranged adjacent to the first surface and are not overlapped with the light-emitting surface of the light-emitting element along the normal direction of the surface of the substrate.

Description

TECHNICAL FIELD

[0001] The utility model relates to an optical module, especially to a light source module. BACKGROUND

[0002] With the application of non-self-luminous display such as liquid crystal display increasingly widely, the design of backlight module also needs to be adjusted according to different applications. In order to meet the demand that the panel product has display high dynamic range (High Dynamic Range, HDR) and high contrast, the backlight module needs to have local dimming. Therefore, the direct type backlight module gradually becomes the market mainstream as the main light source architecture.

[0003] Since the backlight module of this type is expected to achieve a relatively thin thickness (for example, the optical distance is less than 10 millimeters), the packaging layer with a reflecting element or a reflecting structure is usually covered on the light emitting element to achieve a more uniform light emitting effect on the light emitting surface of the backlight module. However, part of the light emitted by the light emitting element is easily reflected by the solder resist ink on the circuit board during the transverse transmission in the packaging layer, so that the light guiding efficiency of the packaging layer for the light is reduced. SUMMARY

[0004] The utility model provides a light source module, and the light guiding efficiency of its packaging layer is better.

[0005] The utility model discloses a light source module, which comprises a circuit board, a light emitting element, a packaging layer and a plurality of microcavities. The light emitting element is arranged on the substrate surface of the circuit board and electrically connected to the circuit board. The packaging layer directly covers the substrate surface and the light emitting element and has a first surface connected to the substrate surface. The plurality of microcavities are embedded in the packaging layer. At least part of the microcavities is arranged adjacent to the first surface and does not overlap the light emitting surface of the light emitting element along the normal direction of the substrate surface.

[0006] In the embodiment of the utility model, at least part of the plurality of microcavities of the light source module comprises a plurality of first microcavities. The first microcavities are arranged adjacent to the first surface and are arranged into reflecting units in a direction parallel to the first surface. The plurality of reflecting units are arranged in the direction, and the distance between any two adjacent reflecting units in the direction is greater than the distance between any two adjacent first microcavities in the direction.

[0007] In the embodiment of the utility model, the distance between any two adjacent first microcavities of the light source module decreases or increases with the distance from the light emitting element.

[0008] In the embodiment of the utility model, the two adjacent ones of the plurality of first microcavities of the light source module are staggered with each other along the direction.

[0009] In the embodiment of the utility model, the plurality of microcavities of the light source module further include a plurality of second microcavities, which are arranged on the side opposite to the first surface of the plurality of first microcavities and are arranged in the direction of light refraction unit. In the normal direction of the substrate surface, the distance between the light refraction unit and the first surface or the second surface is greater than or equal to the thickness of the light refraction unit.

[0010] In the embodiment of the utility model, the distance between the two adjacent ones of the plurality of second microcavities of the light source module decreases or increases away from the light emitting element.

[0011] In the embodiment of the utility model, the two adjacent ones of the plurality of second microcavities of the light source module are staggered with each other along the direction.

[0012] In the embodiment of the utility model, in the normal direction of the substrate surface, the light refraction unit of the light source module partially overlaps the reflection unit, and the light refraction unit and the reflection unit are staggered with each other.

[0013] In the embodiment of the utility model, the plurality of microcavities of the light source module further include a plurality of second microcavities, which are arranged on the side of the light emitting element. In the normal direction of the substrate surface, the light adjusting unit composed of the plurality of second microcavities overlaps the light emitting surface.

[0014] In the embodiment of the utility model, the plurality of second microcavities of the light source module are arranged along a plurality of virtual planes parallel to the light emitting surface. These virtual planes are arranged in the normal direction of the light emitting surface, and the number of the plurality of second microcavities arranged on each virtual plane increases or decreases away from the light emitting surface.

[0015] In the embodiment of the utility model, the two parts of the plurality of second microcavities of the light source module arranged along the two adjacent virtual planes are staggered with each other in the normal direction of the light emitting surface.

[0016] In the embodiment of the utility model, the plurality of second microcavities of the light source module are arranged along a plurality of virtual planes parallel to the light emitting surface. These virtual planes are arranged in the normal direction of the light emitting surface, and the number of the plurality of second microcavities arranged on each virtual plane is the same.

[0017] In the embodiment of the present application, the multiple second microcavities of the light source module include a first one, a second one and a third one arranged along respective virtual planes. The first one and the second one are arranged adjacently along a direction with a first interval. The second one and the third one are arranged adjacently along the direction with a second interval, and the first interval is different from the second interval.

[0018] In the embodiment of the present application, the multiple second microcavities of the light source module are arranged along multiple virtual planes parallel to the light-out surface respectively. The virtual planes are arranged at intervals along the normal direction of the light-out surface. The multiple second microcavities include a first one arranged on one of the virtual planes and a second one arranged on another of the virtual planes, and the configuration of the first one is different from that of the second one.

[0019] In the embodiment of the present application, the multiple virtual planes of the light source module are arranged between the multiple virtual planes and the light-emitting element. The configuration of the first one of the multiple second microcavities includes a spherical shape, a conical shape, an ellipsoidal shape or a cubic shape, and the configuration of the second one of the multiple second microcavities includes an asymmetric conical shape or an irregular shape.

[0020] In the embodiment of the present application, the multiple second microcavities of the light source module are arranged along multiple virtual planes parallel to the light-out surface respectively. The virtual planes are arranged at intervals along the normal direction of the light-out surface. The multiple second microcavities include a first one arranged on one of the virtual planes and a second one arranged on another of the virtual planes. The encapsulation layer has a first cavity surface defining the first one and a second cavity surface defining the second one, and the surface roughness of the first cavity surface is different from that of the second cavity surface.

[0021] In the embodiment of the present application, the multiple second microcavities of the light source module are arranged along multiple virtual planes parallel to the light-out surface respectively. The virtual planes are arranged at intervals along the normal direction of the light-out surface. The multiple second microcavities include a first one arranged on one of the virtual planes and a second one arranged on another of the virtual planes. The encapsulation layer has a first cavity surface defining the first one and a second cavity surface defining the second one, and the surface roughness of the first cavity surface is different from that of the second cavity surface.

[0022] In the embodiment of the present application, the encapsulation layer of the light source module further has a second surface opposite to the first surface. The multiple microcavities further include multiple second microcavities. The multiple second microcavities are arranged adjacent to the second surface and are arranged at intervals along a direction parallel to the second surface into a light-refracting unit.

[0023] In the embodiment of the present application, the second surface of the packaging layer of the light source module is provided with a surface microstructure. A plurality of second microcavities are embedded in the surface microstructure, and are conformally arranged along the part of the second surface defining the surface microstructure.

[0024] In the embodiment of the present application, the light source module further comprises a plurality of micro-particles filled in the plurality of microcavities. The refractive index of the micro-particles is different from the refractive index of the packaging layer.

[0025] Based on the above, in the light source module of the embodiment of the present application, the packaging layer has a first surface directly covering the surface of the substrate of the circuit board. By arranging a plurality of microcavities in the part of the packaging layer close to the first surface, the undesired light emission phenomenon caused by poor reflection effect of part of the light on the first surface of the packaging layer can be effectively avoided.

[0026] In order to make the above features and advantages of the present application more obvious and easy to understand, the following embodiments are described in detail below, and the detailed description is made below with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a sectional view of the light source module according to the first embodiment of the present application;

[0028] Figure 2 is Figure 1 an enlarged schematic view of a local area of the light source module of

[0029] Figures 3A-3H is Figure 2 a sectional view of another variant embodiment of the reflection unit of

[0030] Figure 4 is Figure 1 an enlarged schematic view of a local area of the light source module of

[0031] Figures 5A-5C is Figure 4 a sectional view of another variant embodiment of the light-refraction unit of

[0032] Figures 6A-6D is Figure 5B a sectional view of another variant embodiment of the light-refraction unit of

[0033] Figure 7 is Figure 1 an enlarged schematic view of a local area of the light source module of

[0034] Figure 8A and Figure 8B is Figure 7 a sectional view of another variant embodiment of the light-refraction unit of

[0035] Figure 9 is a sectional view of a light source module according to a second embodiment of the present utility model;

[0036] Figure 10 is a sectional view of a light source module according to a third embodiment of the present utility model;

[0037] Figure 11 is Figure 10 an enlarged view of a partial region of the light source module;

[0038] Figures 12A-12C is Figure 11 a sectional view of another variant embodiment of the light source module;

[0039] Figure 13 is a sectional view of a light source module according to a fourth embodiment of the present utility model;

[0040] Figure 14 is a sectional view of a light source module according to a fifth embodiment of the present utility model.

[0041] Explanation of Reference Signs

[0042] 10, 10A, 20, 30, 40: light source module;

[0043] 100: circuit board;

[0044] 100s: substrate surface;

[0045] 110: solder resist layer;

[0046] 120: light emitting element;

[0047] 120es: light exit surface;

[0048] 140, 140A: encapsulation layer;

[0049] 140s1: first surface;

[0050] 140s2: second surface;

[0051] A1, A2, A3, A4: region;

[0052] CV1, CV2, CV3, CV1-D, CV1-E, CV1-F, CV1-G, CV1-H, CV2-1, CV2-2, CV2-3, CV2a, CV2b, CV2c, CV2d, CV2-D, CV2-E, CV2-F, CV2-G, CV3, CV4: microcavity;

[0053] CV2s: cavity surface;

[0054] d1, d2: distance;

[0055] L: light ray;

[0056] MP1, MP2, MP3: microparticle;

[0057] Sc1, Su, Sc2, Sc2a, Sc2b, Sc3, Sc4: spacing;

[0058] SMS: surface microstructure;

[0059] t, 140t: thickness;

[0060] U1, U1-A, U1-B, U1-C, U1-D, U1-E, U1-F, U1-G, U1-H: reflection unit;

[0061] U2, U2-A, U2-B, U2-C, U2-D, U2-E, U2-F, U2-G, U2-H: light modulation unit;

[0062] U3, U3-A, U3-A1, U3-A2, U3-B, U4, U4-A, U4-B, U4-C: light folding unit;

[0063] VP1, VP2, VP3, VP4, VP5: virtual plane;

[0064] X, Z: direction. DETAILED DESCRIPTION

[0065] Reference will now be made in detail to the exemplary embodiments of the present application, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used in the different drawings / taken to indicate the same or similar elements.

[0066] The above and other technical contents, features and effects of the present application will be apparent from the following detailed description of a preferred embodiment, taken in conjunction with the accompanying drawings. Directional phrases used in the following embodiments, such as up, down, left, right, front or rear, etc., are only with reference to the direction of the drawings. Therefore, the directional phrases used are for illustration, not for limiting the present application.

[0067] Figure 1 is a cross-sectional view of a light source module according to the first embodiment of the present application. Figure 2 is Figure 1 is an enlarged view of a partial region of the light source module of Figures 3A-3H is Figure 2 is a cross-sectional view of another modified embodiment of the reflection unit of Figure 4 is Figure 1 is an enlarged view of a partial region of the light source module of Figures 5A-5C is Figure 4schematic cross-sectional view of another variant embodiment of the light folding unit of Figures 6A-6D schematic cross-sectional view of another variant embodiment of the light folding unit of Figure 5B schematic cross-sectional view of another variant embodiment of the light folding unit of

[0068] Figure 7 schematic cross-sectional view of another variant embodiment of the light folding unit of Figure 1 schematic enlarged view of a partial region of the light source module of Figure 8A schematic cross-sectional view of another variant embodiment of the light folding unit of Figure 8B schematic cross-sectional view of another variant embodiment of the light folding unit of Figure 7 schematic cross-sectional view of another variant embodiment of the light folding unit of Figure 2 corresponding to region A1 of Figure 1 corresponding to region A2 of Figure 4 corresponding to region A3 of Figure 1 corresponding to region A3 of Figure 7 Figure 1 Please refer to schematic cross-sectional view of another variant embodiment of the light folding unit of

[0069] schematic cross-sectional view of another variant embodiment of the light folding unit of Figure 1 schematic cross-sectional view of another variant embodiment of the light folding unit of Figure 2 The light source module 10 includes a circuit board 100, a light emitting element 120, and an encapsulation layer 140. The light emitting element 120 is disposed on a substrate surface 100s of the circuit board 100 and is electrically connected to the circuit board 100. In this embodiment, the light emitting element 120 can be a light emitting diode (LED), such as a mini LED or a micro LED.

[0070] The encapsulation layer 140 directly covers the light emitting element 120 and the substrate surface 100s of the circuit board 100 and has a first surface 140s1 and a second surface 140s2 opposite to each other. More specifically, the first surface 140s1 of the encapsulation layer 140 is connected to the substrate surface 100s of the circuit board 100. The material of the encapsulation layer 140 includes, for example, plastic, resin material (such as acrylic), or other suitable transparent encapsulation material.

[0071] For example, in this embodiment, in order to prevent the circuit from being oxidized by moisture or short-circuited by soldering due to contact with air, a solder resist ink layer 110 with the characteristics of moisture resistance, insulation, solder resist, and high temperature resistance can be provided on the substrate surface 100s of the circuit board 100. In order to avoid the occurrence of unintended light emission phenomenon due to reflection of the solder resist ink layer 110 during the transverse transmission of part of the light emitted by the light emitting element 120 in the encapsulation layer 140, the light source module 10 further has a plurality of micro cavities CV1 embedded in the portion of the encapsulation layer 140 adjacent to the first surface 140s1. It is particularly noted that these micro cavities CV1 do not overlap the light emitting surface 120es of the light emitting element 120 along the normal direction (such as direction Z) of the substrate surface 100s.

[0072] In another aspect, the microcavities CV1 are disposed on opposite sides of the light emitting element 120 along any direction parallel to the substrate surface 100s, such as direction X. For example, the microcavities CV1 can be spaced apart along any direction parallel to the first surface 140s1, such as direction X, into a plurality of reflective units U1, and any two adjacent reflective units U1 along the any direction have a pitch Su that is greater than a pitch Sc1 of any two adjacent microcavities CV1 in any reflective unit U1 along the any direction.

[0073] However, the present application is not limited thereto. In another embodiment, the pitch Su of any two adjacent reflective units U1 can be equal to or similar to the pitch Sc1 of any two adjacent microcavities CV1 in each reflective unit U1. In other words, the number and arrangement of the reflective units U1 near the first surface 140s1 can be adjusted according to the actual requirements of the light distribution pattern, and the present application is not limited by the disclosure of the drawings.

[0074] For example, part of the light rays L emitted by the light emitting element 120 are transmitted toward the circuit board 100 after total internal reflection via the second surface 140s2 of the packaging layer 140. Through the arrangement of the microcavities CV1 of the reflective units U1, the light rays L can be guided again to the second surface 140s2 of the packaging layer 140 by another total internal reflection at the cavity surfaces of the microcavities CV1 defined by the packaging layer 140. In this way, the probability of the light rays L emitted by the light emitting element 120 being reflected or scattered by the substrate surface 100s of the circuit board 100 to produce unintended light emission can be reduced, thereby improving the light guiding efficiency of the packaging layer 140.

[0075] In the present embodiment, the pitch Sc1 of any two adjacent microcavities CV1 in each reflective unit U1 along the arrangement direction, such as direction X, can be the same, but is not limited thereto. In a variant embodiment not shown, the microcavities CV1 in the same reflective unit U1 can be arranged with the same pitch Sc1, but the microcavities CV1 in different reflective units U1 can be arranged with different pitches Sc1. In other words, the arrangement pitch of the microcavities CV1 in the reflective units U1 can be designed individually according to the position of the reflective units U1.

[0076] In Figure 3A In the variant embodiment shown, the pitch Sc1 of any two adjacent microcavities CV1 in the reflective unit U1-A can increase as it moves away from the light emitting element 120. If the cavity surfaces of the microcavities CV1 are relatively smooth, Figure 3A The configuration can guide the light rays L to a region farther away from the light emitting element 120. However, the present application is not limited thereto. In Figure 3BIn a variant embodiment shown in FIG. 1G, the distance Sc1 between any two adjacent microcavities CV1 in the reflective unit U1-B can decrease as it moves away from the light emitting element 120. In this way, the uniformity of light rays L emitted from different regions of the encapsulation layer 140 can be improved. In Figure 3C a variant embodiment shown in FIG. 1H, any two adjacent microcavities CV1 in the reflective unit U1-C can be misaligned with each other along the arrangement direction (e.g., the direction X). In particular, the microcavities CV1 in the reflective unit U1-C can be misaligned with each other along the direction X by a distance Smis. Figure 3C The misaligned design shown can also be applied in the reflective units of Figure 3A or Figure 3B .

[0077] On the other hand, in the present embodiment, the microcavities CV1 of the reflective unit U1 can have a configuration such as a spherical shape (as shown in FIG. 1I), but the present disclosure is not limited thereto. In Figure 2 a variant embodiment shown in FIG. 1J, the microcavities CV1-D of the reflective unit U1-D can have an ellipsoidal shape. In Figure 3D a variant embodiment shown in FIG. 1K, the microcavities CV1-E of the reflective unit U1-E can have a conical shape. In Figure 3E a variant embodiment shown in FIG. 1L, the microcavities CV1-F of the reflective unit U1-F can have an irregular shape. In Figure 3F a variant embodiment shown in FIG. 1M, the microcavities CV1-G of the reflective unit U1-G can have a cuboid shape. In Figure 3G a variant embodiment shown in FIG. 1N, the microcavities CV1-H of the reflective unit U1-H can have an asymmetric conical shape. Figure 3H

[0078] Please refer to Figure 1 and Figure 4 , in order to make the light rays L have a more uniform emission effect on the second surface 140s2 of the encapsulation layer 140, the light source module 10 can further include a plurality of microcavities CV2 embedded in the encapsulation layer 140. These microcavities CV2 are arranged on one side of the light emitting surface 120es of the light emitting element 120, and overlap the light emitting surface 120es along the normal direction (e.g., the direction Z) of the substrate surface 100s. In the present embodiment, the microcavities CV2 can have a spherical shape, but the present disclosure is not limited thereto. In other embodiments, the configuration of the microcavities CV2 can include any of the configurations shown in the microcavities in Figures 3C-3H , such as an ellipsoidal shape (as shown in FIG. 1P), a conical shape (as shown in FIG. 1Q), an irregular shape (as shown in FIG. 1R), a cuboid shape (as shown in FIG. 1S), or an asymmetric conical shape (as shown in FIG. 1T). Figure 3D Figure 3E Figure 3F Figure 3G Figure 3H

[0079] ​​​​​​It is particularly noted that the plurality of microcavities CV2 can be arranged along a plurality of virtual planes VP1-VP4 parallel to the light exit surface 120es and constitute a light modulation unit U2. In the present embodiment, the virtual planes VP1-VP4 can be equidistantly arranged along the normal direction (e.g. direction Z) of the light exit surface 120es, but are not limited thereto. For example, the number of microcavities CV2 arranged on each virtual plane can increase as the distance from the light exit surface 120es increases. That is, the virtual planes VP1-VP4 are arranged in order of the number of microcavities CV2 arranged thereon from small to large, i.e. virtual plane VP1, virtual plane VP2, virtual plane VP3 and virtual plane VP4.

[0080] In the present embodiment, any two adjacent microcavities CV2 on the same virtual plane have the same spacing Sc2 along any direction (e.g. direction X) parallel to the virtual plane, and the two parts in which the plurality of microcavities CV2 are arranged along any two adjacent virtual planes VP1-VP4 are offset from each other in the normal direction of the light exit surface 120es.

[0081] However, the present application is not limited thereto. In Figure 5A In a variant embodiment shown, the number of microcavities CV2 arranged on each virtual plane of the light modulation unit U2-A can decrease as the distance from the light exit surface 120es increases. That is, the virtual planes VP1-VP4 are arranged in order of the number of microcavities CV2 arranged thereon from small to large, i.e. virtual plane VP4, virtual plane VP3, virtual plane VP2 and virtual plane VP1. In Figure 5B In a variant embodiment shown, the number of microcavities CV2 arranged on each virtual plane of the light modulation unit U2-B is the same.

[0082] In Figure 5C In a variant embodiment shown, the arrangement spacing of the plurality of microcavities CV2 on the same virtual plane of the light modulation unit U2-C can be different. For example, the plurality of microcavities CV2 include a first one (e.g. microcavity CV2-1), a second one (e.g. microcavity CV2-2) and a third one (e.g. microcavity CV2-3) arranged along the virtual plane VP4. The first one and the second one are arranged adjacent to each other along the arrangement direction (e.g. direction X) with a spacing Sc2a, the second one and the third one are arranged adjacent to each other along the arrangement direction with a spacing Sc2b, and the spacing Sc2a is different from the spacing Sc2b. Since the arrangement of the microcavities CV2 on the virtual planes VP1, VP2 and VP3 is similar to that on the virtual plane VP4, details are not repeated here.

[0083] Figures 6A-6D The arrangement distribution of the plurality of microcavities is shown respectively, and Figure 5BSome variant embodiments are similar. The difference is that in Figures 6A-6D the light modulation unit, the cavity surfaces of the plurality of microcavities can have different surface roughnesses. In Figures 6A-6C the light modulation unit, the surface roughness of the cavity surfaces CV2s defined by the encapsulation layer 140 can vary with the distance of the virtual plane on which the microcavity is located from the light exit surface 120es.

[0084] For example, in Figure 6A the light modulation unit U2-D, the surface roughness of the cavity surfaces CV2s of the microcavities increases with the distance of the virtual plane on which the microcavity is located from the light exit surface 120es. In detail, the plurality of microcavities constituting the light modulation unit U2-D includes a first one (i.e., microcavity CV2a) arranged on a virtual plane VP1, a second one (i.e., microcavity CV2b) arranged on a virtual plane VP2, a third one (i.e., microcavity CV2c) arranged on a virtual plane VP3, and a fourth one (i.e., microcavity CV2d) arranged on a virtual plane VP4. The plurality of microcavities CV2a-CV2d are arranged in order of microcavity CV2a, microcavity CV2b, microcavity CV2c, and microcavity CV2d according to the roughness of the cavity surfaces CV2s from small to large.

[0085] Conversely, in Figure 6B the light modulation unit U2-E, the surface roughness of the cavity surfaces CV2s of the microcavities decreases with the distance of the virtual plane on which the microcavity is located from the light exit surface 120es. That is, the plurality of microcavities CV2a-CV2d are arranged in order of microcavity CV2d, microcavity CV2c, microcavity CV2b, and microcavity CV2a according to the roughness of the cavity surfaces CV2s from small to large.

[0086] In Figure 6C the light modulation unit U2-F, the surface roughness of the cavity surfaces CV2s of the microcavities increases first and then decreases with the distance of the virtual plane on which the microcavity is located from the light exit surface 120es. For example, the plurality of microcavities CV2a-CV2d are arranged in order of microcavity CV2a, microcavity CV2b, microcavity CV2d, and microcavity CV2c according to the roughness of the cavity surfaces CV2s from small to large.

[0087] Unlike Figures 6A-6C the light modulation unit, in Figure 6DIn the dimming unit U2-G, the plurality of microcavities arranged on the same virtual plane can have different surface roughness of the cavity surface. For example, the plurality of microcavities include a first one (e.g., microcavity CV2a) and a second one (e.g., microcavity CV2b) arranged on respective virtual planes, wherein the surface roughness of the cavity surface CV2s defined by the encapsulation layer 140 for the first one can be different (e.g., greater) than that for the second one. In another variant, the surface roughness of the respective cavity surface CV2s of the plurality of microcavities arranged on the same virtual plane can be differentiated into more than three types according to different light pattern requirements.

[0088] The aforementioned arrangement of the various microcavities allows more flexibility and diversity in adjusting the light deflection, reflection and scattering capability of the dimming unit, which helps to meet different light output requirements of the light source module.

[0089] Please refer to Figure 1 and Figure 7 On the other hand, the light source module 10 further has a plurality of microcavities CV3 embedded in the portion of the encapsulation layer 140 adjacent to the second surface 140s2. These microcavities CV3 are arranged in a plurality of light folding units U3 along any direction (e.g., direction X) parallel to the second surface 140s2. The light folding units U3 are adapted to allow light L to be output at a specific angle to meet different light output requirements. In the present embodiment, the plurality of microcavities CV3 constituting the light folding units U3 can be arranged at the same pitch Sc3 along the arrangement direction (e.g., direction X), but not limited thereto. In Figure 8A a variant, the pitch Sc3 of any two adjacent ones of the plurality of microcavities CV3 constituting the light folding units U3-A can increase as they are further away from the light emitting element 120. In Figure 8B a variant, the pitch Sc3 of any two adjacent ones of the plurality of microcavities CV3 constituting the light folding units U3-B can decrease as they are further away from the light emitting element 120.

[0090] In the present embodiment, the microcavities CV3 can have a spherical shape, but not limited thereto. In other embodiments, the microcavities CV3 can have any shape as shown in the microcavities of Figures 3C-3H , such as ellipsoidal shape (as shown in Figure 3D ), conical shape (as shown in Figure 3E ), irregular shape (as shown in Figure 3F ), cubic shape (as shown in Figure 3G ) or asymmetric conical shape (as shown in Figure 3H ).

[0091] It is particularly mentioned that the micro-cavities constituting the reflecting unit U1, the light-adjusting unit U2 or the light-folding unit U3 can be manufactured by using the process technology of laser sintering packaging materials, wherein the packaging materials include silica gel, but are not limited thereto. Preferably, the size of the aforementioned micro-cavities in any direction can be greater than or equal to 10 microns and less than or equal to 100 microns.

[0092] Some other embodiments will be listed below to further illustrate the present disclosure, wherein the same components will be marked with the same symbols, and the description of the same technical content will be omitted, and the omitted parts will be referred to the aforementioned embodiments, which will not be described herein.

[0093] Figure 9 is a sectional view of a light source module according to a second embodiment of the present utility model. Please refer to Figure 9 , the difference between the light source module 20 of the present embodiment and the light source module 10 of Figure 1 and Figure 4 lies in that the constituent configuration of the light-adjusting unit is different. Specifically, in the light source module 20 of the present embodiment, the configurations of the micro-cavities provided by the light-adjusting unit U2-H on each virtual plane are different from each other.

[0094] For example, the light-adjusting unit U2-H is respectively provided with the micro-cavities CV2-E, CV2-D, CV2, CV2-G and CV2-F on the virtual plane VP1, the virtual plane VP2, the virtual plane VP3, the virtual plane VP4 and the virtual plane VP5. Among them, the configuration of the micro-cavity CV2-E is conical, the configuration of the micro-cavity CV2-D is ellipsoidal, the configuration of the micro-cavity CV2 is spherical, the configuration of the micro-cavity CV2-G is cubic, and the configuration of the micro-cavity CV2-F is irregular, but not limited thereto.

[0095] It is particularly mentioned that the plurality of micro-cavities CV2-F arranged on the virtual plane VP5 farthest from the light-emitting element 120 are suitable for scattering light to achieve the effect of atomizing light, and the micro-cavities CV2-E, CV2-D, CV2 and CV2-G arranged between the virtual plane VP5 and the light-emitting element 120 are suitable for refracting or reflecting light to achieve a functional and precise deflection effect.

[0096] Figure 10 is a sectional view of a light source module according to a third embodiment of the present utility model. Figure 11 is an enlarged schematic view of a partial region of the light source module of Figure 10 . Figures 12A-12C is a sectional view of some other variant embodiments of the light source module of Figure 11 . Please refer to Figure 10 and Figure 11 , the light source module 30 of the present embodiment and the light source module 10 ofFigure 1 The difference between the light source module 10 and the light source module 30 is that the light source module 30 further includes a plurality of microcavities CV4, which are disposed on the side of the plurality of microcavities CV1 facing away from the first surface 140s1, and are arranged at intervals along a direction parallel to the first surface 140s1 (e.g., direction X) to form refractive units U4.

[0097] Of particular note is that, in the normal direction of the substrate surface 100s, the refractive unit U4 partially overlaps with the reflective unit U1, and the refractive unit U4 and the reflective unit U1 are misaligned with each other. The distance d1 between the refractive unit U4 and the first surface 140s1 and the distance d2 between the refractive unit U4 and the second surface 140s2 are greater than or equal to the thickness t of one refractive unit U4. Preferably, the encapsulation layer 140 has a thickness 140t along the normal direction of the substrate surface 100s, and the ratios of distances d1 and d2 to the thickness 140t are in the range of 0.5 to 0.95. That is, the refractive unit U4 is embedded in the encapsulation layer 140 in a portion that is farther away from the first surface 140s1 and the second surface 140s2. By setting the refractive unit U4, the concealing effect of the encapsulation layer 140 can be improved.

[0098] In this embodiment, the spacing Sc4 between any two adjacent microcavities CV4 in each refractive unit U4 along a direction parallel to the first surface 140s1 (e.g., direction X) can be the same, but is not limited thereto. In a modified embodiment not shown, the microcavities CV4 in the same refractive unit U4 can be arranged with the same spacing Sc4, but the microcavities CV4 in different refractive units U4 can be arranged with different spacing Sc4. Alternatively, the arrangement spacing of the microcavities CV4 in the refractive unit U4 can be individually designed according to the position of the refractive unit U4.

[0099] exist Figure 12A In one modified embodiment shown, the distance Sc4 between any two adjacent microcavities CV4 in the refractive unit U4-A can increase with increasing distance from the light-emitting element 120. However, the present invention is not limited thereto. Figure 12B In one modified embodiment shown, the spacing Sc4 between any two adjacent microcavities CV4 in the refractive unit U4-B can decrease as it moves away from the light-emitting element 120. Figure 12C In one modified embodiment shown, any two adjacent microcavities CV4 in the refractive unit U4-C can be misaligned with each other along the alignment direction (e.g., direction X). It should be noted that... Figure 12C The misalignment design shown can also be applied to Figure 12A or Figure 12B In the refractive unit.

[0100] Figure 13 This is a cross-sectional schematic diagram of the light source module according to the fourth embodiment of this utility model. Please refer to...Figure 13 The main difference between the light source module 40 of the present embodiment and the light source module 10 of Figure 1 is that the configuration of the second surface of the encapsulation layer is different. Specifically, in the light source module 40 of the present embodiment, the second surface 140s2 of the encapsulation layer 140A can be provided with a plurality of surface microstructures SMS. The surface microstructures SMS are, for example, protruding structures protruding from the second surface 140s2, but are not limited thereto. In other embodiments, the surface microstructures SMS can be recessed structures recessed from the second surface 140s2 toward the inside of the encapsulation layer 140A. On the other hand, in the present embodiment, the substrate surface 100s of the circuit board 100 is not covered with the anti-solder ink layer 110 as shown in Figure 1 , and the encapsulation layer 140A directly covers the circuit layer (not shown) on the circuit board 100.

[0101] In the present embodiment, the surface microstructures SMS are, for example, microlens structures, but are not limited thereto. In other embodiments, the configuration of the surface microstructures SMS can include boss structures, groove structures, or other suitable protruding structures or recessed structures, or a combination thereof.

[0102] It is particularly noted that, in the present embodiment, the plurality of microcavities CV3 disposed immediately adjacent to the second surface 140s2 are embedded in the plurality of surface microstructures SMS and are arranged conformally along the portions of the surface microstructures SMS that define the second surface 140s2. These microcavities CV3 can be arranged into a plurality of light folding units U3-A1 and a plurality of light folding units U3-A2, and the light folding units embedded in different surface microstructures SMS can have different arrangement manners. For example, the light folding units U3-A1 embedded in the surface microstructures SMS closer to the light emitting element 120 have a plurality of microcavities CV3 arranged in a substantially equidistant manner. However, the light folding units U3-A2 embedded in the surface microstructures SMS farther from the light emitting element 120 have an arrangement pitch of the plurality of microcavities CV3 that increases as the distance from the light emitting element 120 increases. However, the present application is not limited thereto. In other embodiments, the arrangement manner of the plurality of microcavities in the light folding units can be adjusted according to actual light emission requirements.

[0103] Figure 14 is a cross-sectional view of a light source module according to a fifth embodiment of the present application. Please refer to Figure 14 The light source module 10A of the present embodiment and the light source module 10 of Figure 1 differ in that the light source module 10A of the present embodiment can further include a plurality of micro-particles disposed in the plurality of microcavities, and the refractive index of these micro-particles is different from the refractive index of the encapsulation layer.

[0104] For example, in the present embodiment, the microcavity CV1 of the reflecting unit U1 can be filled with micro-particles MP1, the microcavity CV2 of the light-adjusting unit U2 can be filled with micro-particles MP2, and the microcavity CV3 of the light-bending unit U3 can be filled with micro-particles MP3. In the present embodiment, the refractive indexes of the micro-particles MP1, the micro-particles MP2 and the micro-particles MP3 can be substantially the same, but are not limited thereto. In other embodiments, the refractive indexes of the micro-particles MP1, the micro-particles MP2 and the micro-particles MP3 can be different from each other. In some embodiments, the micro-particles in the same reflecting unit U1, light-adjusting unit U2 or light-bending unit U3 can have different refractive indexes.

[0105] It is particularly noted that, in some embodiments, the micro-particles can have a gradually changing refractive index distribution within the microcavity, but are not limited thereto. In other embodiments, the micro-particles can have a uniform refractive index distribution within the microcavity.

[0106] In summary, in the light source module of an embodiment of the present application, the encapsulation layer has a first surface directly covering the surface of the substrate of the circuit board. By arranging a plurality of microcavities in the portion of the encapsulation layer adjacent to the first surface, the undesired light emission phenomenon caused by the poor reflection effect of the light on the first surface of the encapsulation layer can be effectively avoided.

[0107] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A light source module, characterized by The application relates to a light-emitting device, comprising: a circuit board; a light-emitting element disposed on a substrate surface of the circuit board and electrically connected to the circuit board; a packaging layer directly covering the substrate surface and the light-emitting element and having a first surface connected to the substrate surface; and a plurality of microcavities embedded in the packaging layer, at least part of the plurality of microcavities being disposed adjacent to the first surface and not overlapping with a light-emitting surface of the light-emitting element along a normal direction of the substrate surface. The at least part of the plurality of microcavities comprises a plurality of first microcavities disposed adjacent to the first surface and spaced apart along a direction parallel to the first surface to form reflection units, and any two adjacent reflection units are spaced apart along the direction by a distance greater than that between any two adjacent first microcavities along the direction.

2. The light source module according to claim 1, characterized in that, The distance between any two adjacent first microcavities decreases or increases as they are farther away from the light-emitting element.

3. The light source module according to claim 2, characterized in that Any two adjacent first microcavities are misaligned with each other along the direction.

4. The light source module according to claim 2, characterized by The plurality of microcavities further comprises a plurality of second microcavities disposed on a side of the plurality of first microcavities opposite to the first surface and spaced apart along the direction to form light-refracting units, and a distance between the light-refracting units and the first surface or a second surface along the normal direction of the substrate surface is greater than or equal to a thickness of the light-refracting units.

5. The light source module according to claim 2, characterized by The distance between any two adjacent second microcavities decreases or increases as they are farther away from the light-emitting element.

6. The light source module according to claim 5, characterized in that Any two adjacent second microcavities are misaligned with each other along the direction.

7. The light source module according to claim 5, characterized by The light-refracting units partially overlap with the reflection units along the normal direction of the substrate surface, and the light-refracting units and the reflection units are misaligned with each other.

8. The light source module according to claim 5, characterized by The plurality of microcavities further comprises a plurality of second microcavities disposed on a side of the light-emitting surface of the light-emitting element, and a light-adjusting unit formed by the plurality of second microcavities overlaps with the light-emitting surface along the normal direction of the substrate surface.

9. The light source module according to claim 2, characterized by The plurality of second microcavities are respectively arranged along a plurality of virtual planes parallel to the light-emitting surface, the plurality of virtual planes are spaced apart along a normal direction of the light-emitting surface, and a number of the plurality of second microcavities arranged on each of the plurality of virtual planes increases or decreases as they are farther away from the light-emitting surface.

10. The light source module according to claim 9, characterized by Any two adjacent second microcavities arranged along the plurality of virtual planes are misaligned with each other along the normal direction of the light-emitting surface.

11. The light source module according to claim 10, characterized by The plurality of second microcavities are respectively arranged along a plurality of virtual planes parallel to the light-emitting surface, the plurality of virtual planes are spaced apart along a normal direction of the light-emitting surface, and a number of the plurality of second microcavities arranged on each of the plurality of virtual planes is the same.

12. The light source module of claim 9, wherein ​ 13. The light source module according to claim 12, characterized by The second microcavities are arranged along a plurality of virtual planes parallel to the light-outcoupling surface, the virtual planes are spaced along a normal direction of the light-outcoupling surface, the second microcavities include a first one arranged on one of the virtual planes and a second one arranged on another of the virtual planes, the encapsulation layer has a first cavity surface defining the first one and a second cavity surface defining the second one, and a surface roughness of the first cavity surface is different from a surface roughness of the second cavity surface.

14. The light source module of claim 9, wherein The second microcavities are arranged along a plurality of virtual planes parallel to the light-outcoupling surface, the virtual planes are spaced along a normal direction of the light-outcoupling surface, the second microcavities include a first one arranged on one of the virtual planes and a second one arranged on another of the virtual planes, the encapsulation layer has a first cavity surface defining the first one and a second cavity surface defining the second one, and a surface roughness of the first cavity surface is different from a surface roughness of the second cavity surface.

15. The light source module according to claim 14, characterized by The one of the virtual planes is between the another of the virtual planes and the light-emitting element, the configuration of the first one of the second microcavities includes a spherical shape, a conical shape, an ellipsoidal shape, or a cubic shape, and the configuration of the second one of the second microcavities includes an asymmetric conical shape.

16. The light source module of claim 9, wherein The second microcavities are arranged along a plurality of virtual planes parallel to the light-outcoupling surface, the virtual planes are spaced along a normal direction of the light-outcoupling surface, the second microcavities include a first one arranged on one of the virtual planes and a second one arranged on another of the virtual planes, the encapsulation layer has a first cavity surface defining the first one and a second cavity surface defining the second one, and a surface roughness of the first cavity surface is different from a surface roughness of the second cavity surface.

17. The light source module of claim 9, wherein The second microcavities are arranged along a plurality of virtual planes parallel to the light-outcoupling surface, the virtual planes are spaced along a normal direction of the light-outcoupling surface, the second microcavities include a first one arranged on one of the virtual planes and a second one arranged on another of the virtual planes, the encapsulation layer has a first cavity surface defining the first one and a second cavity surface defining the second one, and a surface roughness of the first cavity surface is different from a surface roughness of the second cavity surface.

18. The light source module according to claim 2, characterized by The encapsulation layer further has a second surface facing away from the first surface, the microcavities further include second microcavities arranged immediately adjacent to the second surface and spaced along a direction parallel to the second surface into optical units.

19. The light source module of claim 18, wherein, The second surface of the encapsulation layer is provided with a surface microstructure, the second microcavities are embedded in the surface microstructure, and are arranged conformally along portions of the surface microstructure defined along the second surface.

20. The light source module of claim 1, wherein, Further comprising: A plurality of microparticles filled in the microcavities, wherein a refractive index of the microparticles is different from a refractive index of the encapsulation layer.

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