Light source module

Abstract

The present invention provides a light source module, which includes a substrate, a light-emitting element, a packaging structure and an optical pattern. The light-emitting element and the packaging structure are arranged on the surface of the substrate, and the packaging structure covers the light-emitting element. The packaging structure has a first groove and a second groove that are connected. The light-emitting element is located between the first groove and the substrate. The second groove is located between the first groove and the substrate. The vertical projection of the area occupied by the first groove on the substrate has a geometric center. The light-emitting element is located at the geometric center. The vertical projection of the area occupied by the second groove on the substrate does not overlap with the geometric center. The optical pattern is arranged in the first groove and the second groove, and has the characteristics of partial penetration and partial reflection.

Description

Technical Field

[0001] The invention relates to a backlight module, and in particular to a light source module with an asymmetric packaging structure. Background Art

[0002] As the application of non-self-luminous displays such as liquid crystal displays becomes more and more widespread, the design of backlight modules also needs to be adjusted for different applications. In order to meet the requirements of panel products with high dynamic range (HDR) and high contrast, the backlight module needs to have local dimming. Therefore, the direct-type backlight module as the main light source architecture has gradually become the mainstream of the market. Since this type of backlight module is expected to be thinner (for example, the optical distance is less than 10 mm), the light-emitting element is usually covered with a packaging layer with a reflector or a reflective structure to achieve a more uniform light output effect on the light output surface of the backlight module.

[0003] However, during the transmission process of part of the light emitted from the light-emitting element in the packaging layer, it will still be transmitted horizontally (for example, perpendicular to the light emitting direction) to the adjacent or farther light source (i.e., another light-emitting element) area through multiple total reflections in the packaging layer, causing a halo effect around the light emitting area of ​​the light-emitting element, resulting in blurred edges of the displayed image, leading to a decrease in the overall display quality (for example, display contrast). On the other hand, due to the setting of the reflector or reflective structure, the light emitting surface of this type of backlight module is prone to produce reflective dark spots in the area where the light-emitting element overlaps, affecting the overall light emitting uniformity. Therefore, how to improve the light emitting uniformity of ultra-thin direct-type backlight modules is one of the research and development focuses of related manufacturers. Summary of the invention

[0004] The present invention is directed to a light source module, which can effectively improve the total light output and light output uniformity in a specific light output area.

[0005] According to an embodiment of the present invention, a light source module includes: a substrate, a light-emitting element, a packaging structure, and an optical pattern. The light-emitting element and the packaging structure are arranged on the surface of the substrate, and the packaging structure covers the light-emitting element. The packaging structure has a first groove and a second groove that are connected. The light-emitting element is located between the first groove and the substrate. The second groove is located between the first groove and the substrate. The vertical projection of the area occupied by the first groove on the substrate has a geometric center. The light-emitting element is located at the geometric center. The vertical projection of the area occupied by the second groove on the substrate does not overlap with the geometric center. The optical pattern is arranged in the first groove and the second groove, and has the characteristics of partial penetration and partial reflection.

[0006] In the light source module according to the embodiment of the present invention, the vertical projection of the packaging structure on the substrate has a symmetry axis passing through the geometric center, and the second groove and the light emitting element are arranged along the axial direction of the symmetry axis.

[0007] In the light source module according to the embodiment of the present invention, the packaging structure further has a first side edge and a second side edge opposite to each other in the axial direction of the symmetry axis. There is a first distance between the first side edge and the geometric center. There is a second distance between the second side edge and the geometric center, and the first distance is smaller than the second distance.

[0008] In the light source module according to the embodiment of the present invention, the ratio of the first distance to the second distance is less than 0.8.

[0009] In the light source module according to the embodiment of the present invention, the packaging structure further has an edge line defining the first groove. The edge line and the geometric center have a distance D in the axial direction of the symmetry axis. The area occupied by the second groove has a width W in the axial direction of the symmetry axis, and satisfies W <D。

[0010] In the light source module according to the embodiment of the present invention, the light emitting element has an element length L in the axial direction of the symmetry axis. The packaging structure also has a groove bottom surface defining a second groove. The groove bottom surface has a width W' in the axial direction of the symmetry axis, and satisfies W' <D-(L / 2)。

[0011] In the light source module according to the embodiment of the present invention, the packaging structure and the light emitting element have a maximum thickness T and an element thickness t respectively in the normal direction of the surface of the substrate. A virtual line with the shortest spacing between the edge line and the light emitting element has an angle θ with the normal direction of the surface of the substrate, and satisfies D=L / 2+(Tt)·tanθ.

[0012] In the light source module according to the embodiment of the present invention, the packaging structure further has a groove bottom surface defining a first groove, the light emitting element has a top surface facing the first groove, and the distance between the groove bottom surface of the packaging structure and the top surface of the light emitting element is greater than zero.

[0013] In the light source module according to the embodiment of the present invention, the packaging structure further has an edge line surrounding the first groove and the second groove and a groove bottom surface defining the second groove. The distance between the edge line and the surface of the substrate defines the maximum thickness of the packaging structure in a direction perpendicular to the substrate. There is a distance between the groove bottom surface and the edge line in a direction perpendicular to the substrate, and the distance is less than or equal to the maximum thickness of the packaging structure.

[0014] In the light source module according to the embodiment of the present invention, the optical pattern includes a first part and a second part. The second part is disposed between the first part and the substrate. The first part has a plurality of reflective particles, and the second part has a plurality of wavelength conversion particles.

[0015] In the light source module according to the embodiment of the present invention, the encapsulation structure further has an edge line surrounding the first groove and the second groove and a groove bottom surface defining the second groove. The first part of the optical pattern contacts the groove bottom surface. There is a distance d between the groove bottom surface and the edge line in a direction perpendicular to the substrate. The second part has a thickness t' in a direction perpendicular to the substrate, and satisfies t'<2d / 3.

[0016] In the light source module according to the embodiment of the present invention, the transmittance of the optical pattern is between 10% and 50%.

[0017] In the light source module according to the embodiment of the present invention, the optical pattern includes a light-transmitting substrate and a plurality of reflective particles. The reflective particles are dispersedly disposed in the light-transmitting substrate.

[0018] In the light source module according to the embodiment of the present invention, the material of the plurality of reflective particles includes silicon dioxide, titanium dioxide, metal material or a combination thereof.

[0019] Based on the above, in a light source module of one embodiment of the present invention, the light-emitting element is overlapped and arranged at the geometric center of the first groove of the packaging structure, and the first groove is filled with an optical pattern. Through the partial penetration and partial reflection characteristics of the optical pattern, the forward light output of the light-emitting element can be adjusted and the dark spot phenomenon formed after part of the light is reflected by the optical pattern can be improved. On the other hand, a second groove connected to the first groove is provided on one side of the light-emitting element, and the above-mentioned optical pattern further extends into the second groove. Accordingly, most of the light can be deflected to the side area of ​​the light-emitting element relative to the second groove, so as to effectively increase the light output of a specific area, while preventing the light from being transmitted to the light output area of ​​the adjacent light-emitting element. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic top view of a light source module according to a first embodiment of the present invention;

[0021] Figure 2 yes Figure 1 A cross-sectional schematic diagram of a light source module;

[0022] Figure 3A yes Figure 1 Illuminance distribution diagram of the light source module without optical film;

[0023] Figure 3B yes Figure 1 Illuminance distribution diagram of the light source module after passing through the optical film;

[0024] Figure 4 is a schematic top view of a packaging structure according to another embodiment of the present invention;

[0025] Figure 5is a schematic top view of a packaging structure according to another embodiment of the present invention;

[0026] Figure 6 is a schematic cross-sectional view of a light source module according to a second embodiment of the present invention.

[0027] Description of Reference Numerals

[0028] 10, 10A: light source module;

[0029] 100: substrate;

[0030] 100s, 120as, 120bs: surface;

[0031] 110: light emitting element;

[0032] 110t: top;

[0033] 120, 120A, 120B: packaging structure;

[0034] 120e1: first side edge;

[0035] 120e2: second side edge;

[0036] 120g1: first groove;

[0037] 120g2, 120g2A, 120g2B: second groove;

[0038] 120g3: the third groove;

[0039] 120s1, 120s2: groove bottom;

[0040] 130, 130A: optical pattern;

[0041] 130A1: Part I;

[0042] 130A2: Part II;

[0043] 131, 133: light-transmitting substrate;

[0044] 132: reflective particles;

[0045] 134: Wavelength conversion particles;

[0046] 200: Optical film;

[0047] C: geometric center;

[0048] d, D: distance;

[0049] IL: Virtual Link;

[0050] L: component length;

[0051] L1: first distance;

[0052] L2: second distance;

[0053] LB1, LB2, LB3: light;

[0054] RL1, RL2, RL2A, RL2B, RL3: ridge line;

[0055] SA: symmetry axis;

[0056] t: component thickness;

[0057] t': thickness;

[0058] T: maximum thickness;

[0059] W, W': width;

[0060] X, Y, Z: direction;

[0061] θ: angle;

[0062] A-A': section line. DETAILED DESCRIPTION

[0063] The above-mentioned other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of a preferred embodiment with reference to the accompanying drawings. The directional terms mentioned in the following embodiments, such as up, down, left, right, front or back, etc., are only referenced to the directions of the attached drawings. Therefore, the directional terms used are used to illustrate and not to limit the present invention.

[0064] Reference will now be made in detail to exemplary embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Whenever possible, the same reference numerals are used in the drawings and the description to refer to the same or like parts.

[0065] Figure 1 FIG. 1 is a schematic top view of a light source module according to a first embodiment of the present invention. Figure 2 yes Figure 1 A cross-sectional schematic diagram of a light source module. Figure 3A yes Figure 1 Illuminance distribution diagram of the light source module without optical film. Figure 3B yes Figure 1 The illuminance distribution diagram of the light source module after passing through the optical film. In particular, Figure 2 Corresponds to Figure 1 For the sake of clarity, Figure 1 Omitted Figure 2 An optical film 200 is shown.

[0066] Please refer to Figure 1 and Figure 2 The light source module 10 includes a substrate 100, a plurality of light-emitting elements 110, and a plurality of packaging structures 120. The plurality of light-emitting elements 110 and the plurality of packaging structures 120 are disposed on a surface 100s of the substrate 100, and the packaging structures 120 cover the light-emitting elements 110 respectively. For example, the plurality of light-emitting elements 110 may be arranged in an array on the substrate 100 (for example, arranged in a plurality of rows and columns in directions X and Y, respectively), and the plurality of packaging structures 120 overlapping the light-emitting elements 110 are arranged in connection with each other. The material of the packaging structure 120 includes, for example, plastic, resin material (for example, acrylic), or other suitable transparent packaging materials.

[0067] It should be noted that Figure 1 The disclosed content is only for exemplary purposes, and the present invention is not limited to the arrangement of the multiple light-emitting elements 110 and the multiple packaging structures 120. In other embodiments, the arrangement of the multiple light-emitting elements 110 and the multiple packaging structures 120 can be adjusted according to the actual optical design or application requirements, for example, two adjacent packaging structures 120 can also be separately disposed on the substrate 100. On the other hand, in this embodiment, the number of light-emitting elements 110 covered by each packaging structure 120 is exemplarily described as one, which does not mean that the present invention is limited to this. In other embodiments, the number of light-emitting elements 110 covered by each packaging structure 120 can also be more than two, for example, three light-emitting elements that can emit red light, green light and blue light respectively.

[0068] In the present embodiment, the light emitting element 110 may be a light emitting diode (LED), for example, a sub-millimeter light emitting diode (mini LED) or a micro light emitting diode (micro LED). It is worth noting that the outer contour of the vertical projection of the packaging structure 120 on the surface 100s of the substrate 100 is substantially rectangular, but the present invention is not limited to this. In other embodiments, the outer contour of the vertical projection of the packaging structure on the substrate 100 may also be an arc, a polygon or other suitable shapes. On the other hand, in the present embodiment, the vertical projection of the packaging structure 120 on the surface 100s of the substrate 100 has a symmetry axis SA. That is, the two parts of the packaging structure 120 located on both sides of the symmetry axis SA are mirror-symmetrical.

[0069] In order to deflect most of the light from the light emitting element 110 to a side region of the light emitting element 110, the package structure 120 presents an asymmetric structural distribution in a specific direction. For example, the package structure 120 of the present embodiment has an asymmetric groove overlapped with the light emitting element 110, and the asymmetric groove is asymmetric in the axial direction of the symmetry axis SA (e.g., direction X).

[0070] In detail, the asymmetric groove can be formed by a first groove 120g1 and a second groove 120g2 that are connected, and the second groove 120g2 is located between the first groove 120g1 and the substrate 100. In the present embodiment, the vertical projection of the area occupied by the first groove 120g1 on the substrate 100 has a geometric center C, the symmetry axis SA of the package structure 120 passes through the geometric center C, and the vertical projection of the area occupied by the second groove 120g2 on the substrate 100 does not overlap with the geometric center C.

[0071] More specifically, the vertical projection of the area occupied by the second groove 120g2 on the substrate 100 overlaps the symmetry axis SA and is located between the geometric center C and the first side edge 120e1. In addition, the packaging structure 120 also has a first side edge 120e1 and a second side edge 120e2 that are opposite to each other in the axial direction of the symmetry axis SA. There is a first distance L1 between the first side edge 120e1 and the geometric center C, and there is a second distance L2 between the second side edge 120e2 and the geometric center C, and the first distance L1 is smaller than the second distance L2. In other words, the above-mentioned asymmetric groove is arranged at a position of the packaging structure 120 that is closer to the first side edge 120e1. For example, in the present embodiment, the ratio of the first distance L1 to the second distance L2 can be less than 0.8, so that the packaging structure 120 has better asymmetry in the axial direction of the symmetry axis SA.

[0072] In this embodiment, the light emitting element 110 is optionally placed at a position where the substrate 100 overlaps the geometric center C. In other words, the second groove 120g2 and the light emitting element 110 are arranged along the axial direction of the symmetry axis SA of the package structure 120. In order to deflect most of the light from the light emitting element 110 to a specific side area of ​​the light emitting element 110 (e.g. Figure 2 The light source module 10 further includes an optical pattern 130 filled in the first groove 120g1 and the second groove 120g2, and the optical pattern 130 has a partially transmissive and partially reflective characteristic. For example, the optical pattern 130 may include a light-transmitting substrate 131 and a plurality of reflective particles 132 dispersedly disposed in the light-transmitting substrate 131. The material of the light-transmitting substrate 131 may include, for example, acrylic, epoxy, hexamethyldisiloxane (HMDSO), or other suitable polymer materials. The material of the reflective particles 132 may include, for example, silicon dioxide (SiO2), titanium dioxide (TiO2), metal materials, or a combination thereof, or other materials with appropriate reflectivity.

[0073] By adjusting the doping concentration of the reflective particles 132, the transmittance of the optical pattern 130 can be adjusted between 10% and 50% (or, the concentration of the reflective particles 132 in the optical pattern 130 is between 20% and 60%) to meet different optical designs (e.g., light emitting patterns with different asymmetries). For example, the light LB1 from the light emitting element 110 and transmitted toward the second groove 120g2 is reflected by the reflective particles 132 and then is directed toward the side of the light emitting element 110 away from the second groove 120g2 (e.g., Figure 2 Similarly, light (not shown) from the light emitting element 110 and transmitted toward the first groove 120g1 can be transmitted toward the substrate 100 after being reflected by the reflective particles 132 in the first groove 120g1. Since the substrate 100 of the present embodiment is a reflective substrate, the light reflected by the reflective particles 132 in the first groove 120g1 can be further reflected by the substrate 100 and transmitted laterally into the package structure 120, but the present invention is not limited thereto.

[0074] Furthermore, the packaging structure 120 also has an edge RL1 that defines the first groove 120g1, and a virtual line IL with the shortest spacing between the edge RL1 and the light-emitting element 110 has an angle θ with the normal direction of the surface 100s of the substrate 100, and the configuration relationship between the packaging structure 120 and the light-emitting element 110 satisfies the following formula: D=L / 2+(Tt)·tanθ, wherein D is the distance between the edge RL1 and the geometric center C in the axial direction of the symmetry axis SA (for example, direction X), L is the element length of the light-emitting element 110 in the axial direction of the symmetry axis SA, t is the element thickness of the light-emitting element 110 in the normal direction of the surface 100s of the substrate 100, and T is the maximum thickness of the packaging structure 120 in the normal direction of the surface 100s of the substrate 100.

[0075] It is particularly noted that the above-mentioned angle θ depends on the refractive index ratio of the material of the packaging structure 120 and the air. In the present embodiment, the refractive index of the material of the packaging structure 120 may be between 1.1 and 1.7. Correspondingly, the above-mentioned angle θ may be between 36 degrees and 65 degrees. Accordingly, the light of the light-emitting element 110 may have a better asymmetric light type after emitting the packaging structure 120. It is worth mentioning that in addition to reflecting part of the light from the light-emitting element 110 (such as the light LB1) by the reflective particles 132 of the optical pattern 130, the refractive index of the packaging structure 120 may be optionally greater than the refractive index of the light-transmitting substrate 131 of the optical pattern 130, so that another part of the light (such as the light LB2) can be totally reflected at the interface between the packaging structure 120 and the optical pattern 130, so as to increase the chance of light being transmitted laterally in the packaging structure 120.

[0076] For example, the encapsulation structure 120 defines the groove bottom surface 120s1 of the first groove 120g1. The cross-sectional (e.g., XZ plane or YZ plane) profile thereof may have an arc segment, and this arc segment extends from the ridge line RL1 to directly above the light-emitting element 110. The curvature change of the arc segment can be adjusted according to different total reflection requirements, and the present invention is not limited thereto. On the other hand, since the optical pattern 130 has adjustable light transmittance, the forward (e.g., direction Z) light output of the light-emitting element 110 can be adjusted, and the dark spot phenomenon formed after partial (forward) light is reflected by the optical pattern 130 can be improved. For example, part of the light (e.g., light LB3) from the light-emitting element 110 and transmitted toward the first groove 120g1 can directly pass through the optical pattern 130 without being reflected back to the encapsulation structure 120 by the reflection particles 132.

[0077] In this embodiment, the vertical projection of the area occupied by the first groove 120g1 on the surface 100s of the substrate 100 has a circular contour, for example, and the center of the circle is located at the aforementioned geometric center C. In other words, the width of the vertical projection of the area occupied by the first groove 120g1 on the surface 100s of the substrate 100 in the axial direction of the symmetry axis SA is twice the value of the distance D (i.e., 2D as shown in Figure 1 . However, the present invention is not limited thereto. According to other embodiments, the vertical projection contour of the area occupied by the first groove on the surface 100s of the substrate 100 can also be quasi-circular, elliptical, or quasi-elliptical.

[0078] The vertical projection of the area occupied by the second groove 120g2 on the surface 100s of the substrate 100 has a quasi-semicircular contour, for example, and has a width W less than the distance D in the axial direction of the symmetry axis SA. However, the present invention is not limited thereto. On the other hand, the encapsulation structure 120 also has a groove bottom surface 120s2 that defines the second groove 120g2. The vertical projection of this groove bottom surface 120s2 on the surface 100s of the substrate 100 has a width W' in the axial direction of the symmetry axis SA, and satisfies W' < D - (L / 2). In this embodiment, the area surrounded by the ridge line RL2 that defines the second groove 120g2 of the encapsulation structure 120 and the groove bottom surface 120s2 do not overlap the light-emitting element 110 in the normal direction of the surface 100s of the substrate 100, but the present invention is not limited thereto. In other embodiments, the light-emitting element 110 may partially overlap the area surrounded by the ridge line RL2 that defines the second groove 120g2 of the encapsulation structure 120 in the normal direction of the surface 100s of the substrate 100, but does not overlap the groove bottom surface 120s2.

[0079] It is worth mentioning that in this embodiment, the second groove 120g2 may have a high aspect ratio. That is, the sidewall of the second groove 120g2 defined by the package structure 120 is steeper. Accordingly, the light from the light-emitting element 110 can be effectively deflected toward a side area of ​​the light-emitting element 110 relative to the second groove 120g2, so as to increase the light output of a specific area, while preventing the light from being transmitted to the light output area of ​​the adjacent light-emitting element 110.

[0080] In this embodiment, the packaging structure 120 may further optionally have a third groove 120g3, and the first groove 120g1 is connected between the second groove 120g2 and the third groove 120g3. That is, the asymmetric groove of this embodiment may be a combination of the first groove 120g1, the second groove 120g2 and the third groove 120g3. It should be noted that the optical pattern 130 is not filled into the third groove 120g3, but the present invention is not limited thereto. In other embodiments, the optical pattern 130 may also be filled into a partial area occupied by the third groove 120g3.

[0081] In detail, the package structure 120 further has an edge line RL3 defining the third groove 120g3, and the edge line RL3 surrounds the first groove 120g1 and the second groove 120g2. The vertical projection of the area occupied by the first groove 120g1 and the second groove 120g2 on the surface 100s of the substrate 100 completely overlaps the vertical projection of the area occupied by the third groove 120g3 on the surface 100s of the substrate 100. More specifically, the vertical projection area of ​​the area occupied by the third groove 120g3 on the surface 100s of the substrate 100 is greater than the vertical projection area of ​​the area occupied by the first groove 120g1 and the second groove 120g2 on the surface 100s of the substrate 100.

[0082] In order to effectively transfer to the light emitting element 110 side (eg Figure 2 The light from the left side of the light emitting element 110 is reversely deflected to the other side of the light emitting element 110 (for example Figure 2 The package structure 120 defines that the distance between the bottom surface 120s1 of the first groove 120g1 and the top surface 110t of the light emitting element 110 must be greater than 0 to ensure the reflection effect of the portion of the optical pattern 130 located in the second groove 120g2. It should be understood that the distance between the bottom surface 120s1 of the groove and the top surface 110t of the light emitting element 110 can be adjusted according to actual light type requirements.

[0083] On the other hand, in the normal direction of the surface 100s of the substrate 100, the distance between the ridge RL3 and the surface 100s of the substrate 100 can define the maximum thickness T of the packaging structure 120, and there is a distance d between the bottom surface 120s2 of the groove and the ridge RL3, and this distance d is less than the maximum thickness T of the packaging structure 120. In other words, there may be a gap between the bottom surface 120s2 of the groove and the surface 100s of the substrate 100, and this gap allows part of the light to pass through to maintain the uniformity of light output on the other side. However, the present invention is not limited to this, and according to other embodiments, the distance d between the bottom surface 120s2 of the groove and the ridge RL3 may also be optionally equal to the maximum thickness T of the packaging structure 120. In other words, the connected first groove 120g1, the second groove 120g2 and the third groove 120g3 may also penetrate the packaging structure 120, and the optical pattern 130 may directly cover the surface 100s of the substrate 100.

[0084] It is worth noting that, in the axial direction of the symmetry axis SA, the slope change of the surface 120as of the packaging structure 120 located on one side of the asymmetric groove is different from the slope change of the surface 120bs located on the other side of the asymmetric groove. For example, the slope of the surface 120as of the packaging structure 120 located on one side of the light-emitting element 110 gradually increases from the ridgeline RL3 to the first side edge 120e1 at a first change rate, and the slope of the surface 120bs of the packaging structure 120 located on the other side of the light-emitting element 110 gradually increases from the ridgeline RL3 to the second side edge 120e2 at a second change rate, and the second change rate is less than the first change rate. Since the light-emitting element 110 is disposed at a position closer to the first side edge 120e1, the surface 120bs with a gentler slope can increase the chance of light being transmitted laterally in the packaging structure 120, which helps to improve the uniformity of light output from the light-emitting element 110 toward a specific side.

[0085] Please refer to Figure 3A By configuring the packaging structure 120 and the optical pattern 130, the light emitting pattern of the light emitting element 110 can be asymmetric in the direction X (i.e., the axial direction of the symmetry axis SA of the packaging structure 120), but symmetric in the direction Y. Figure 3A As shown in the illuminance distribution curve on the right side of the middle, the light output of the light emitting element 110 on the XZ plane is mostly concentrated on a specific side (eg Figure 3A On the contrary, if Figure 3A As shown in the illuminance distribution curve in the middle and lower side, the light output of the light emitting element 110 on the YZ plane is evenly distributed on the opposite sides of the light emitting element 110 (for example Figure 3A left and right sides of the vertical dashed line in the figure).

[0086] Please continue to refer to Figure 2It is particularly noted that the light source module 10 of this embodiment may further include an optical film 200, which is overlapped on the multiple light-emitting elements 110 and the multiple packaging structures 120. The optical film 200 may be a prism sheet, a diffuser sheet, a multi-layer combination of the above, or other optical films suitable for improving uniformity, but is not limited thereto. In other embodiments, the optical film 200 may also be a wavelength conversion film, and the wavelength conversion film may include, for example, a quantum dot film, a phosphor film, etc. For example, in this embodiment, the optical film 200 is, for example, a prism sheet having multiple prism structures (not shown), and these prism structures may be used to deflect light from the packaging structure 120 to a preset viewing angle (e.g., a positive viewing angle) range, so as to increase the light output of the light source module 10 within the viewing angle range. As Figure 3B As shown, the light pattern of the light emitting element 110 has symmetry in at least two axes (eg, direction X and direction Y) after being acted upon by the optical film 200. More specifically, the light source module 10 of this embodiment can be used as a backlight module with high light collection performance.

[0087] Other embodiments will be listed below to explain the present disclosure in detail, wherein the same components will be marked with the same symbols, and the description of the same technical content will be omitted. For the omitted parts, please refer to the aforementioned embodiments and will not be repeated below.

[0088] Figure 4 FIG. 4 is a schematic top view of a packaging structure according to another embodiment of the present invention. Figure 5 FIG. 1 is a top view of a packaging structure according to another embodiment of the present invention. Figure 4 The package structure 120A of this embodiment is Figure 1 The difference between the package structure 120 in FIG. 1 and FIG. 2 is that the configuration of the second groove is different. Specifically, the area occupied by the second groove 120g2A of the package structure 120A is on the surface 100s (eg, Figure 2 Specifically, a portion of the ridge line RL2A defining the second groove 120g2A of the package structure 120A is bent toward the first side edge 120e1 of the package structure 120A.

[0089] However, the present invention is not limited thereto. Figure 5 In another embodiment shown, the ridge line RL2B defining the second groove 120g2B of the package structure 120B may also be bent in its entirety toward the second side edge 120e2 of the package structure 120B. Figure 5 The second groove 120g2B is formed on the surface 100s (eg Figure 2 The vertical projection profile on the PCB (as shown) can also be rugby-shaped.

[0090] In particular, due to Figure 4Package structure 120A (or Figure 5 The packaging structure 120B), the configuration relationship between the optical pattern and the light emitting element is similar to Figure 1 and Figure 2 Therefore, the detailed description can refer to the relevant paragraphs of the aforementioned embodiment and will not be repeated here.

[0091] Figure 6 is a cross-sectional view of a light source module according to a second embodiment of the present invention. Figure 6 The light source module 10A of this embodiment is Figure 2 The difference between the light source module 10A and the light source module 10A is that the composition of the optical pattern is different. Specifically, the optical pattern 130A of the light source module 10A includes a first portion 130A1 and a second portion 130A2, and the second portion 130A2 is disposed between the first portion 130A1 and the substrate 100. It should be noted that the first portion 130A1 of the optical pattern 130A has a light-transmitting substrate 131 and a plurality of reflective particles 132 dispersedly disposed in the light-transmitting substrate 131, and the second portion 130A2 has a light-transmitting substrate 133 and a plurality of wavelength conversion particles 134 dispersedly disposed in the light-transmitting substrate 133.

[0092] In this embodiment, the material of the light-transmitting substrate 131 of the first portion 130A1 and the light-transmitting substrate 133 of the second portion 130A2 may be the same, but the present invention is not limited thereto. Figure 2 Therefore, please refer to the relevant paragraphs of the aforementioned embodiment for detailed description, which will not be repeated here.

[0093] For example, the plurality of wavelength conversion particles 134 of the second portion 130A2 of the optical pattern 130A may have a single particle size or multiple particle sizes to meet different light mixing requirements. It is particularly noted that, in the present embodiment, the first portion 130A1 and the second portion 130A2 of the optical pattern 130A are respectively disposed in the first groove 120g1 and the second groove 120g2 of the packaging structure 120. The second portion 130A2 has a thickness t' in the normal direction of the surface 100s of the substrate 100, and satisfies t'<2d / 3, where d is the distance between the groove bottom surface 120s2 and the edge line RL3 in the normal direction of the surface 100s of the substrate 100. Accordingly, the light mixing effect of the light emitted from the packaging structure 120 can be optimized.

[0094] However, the present invention is not limited thereto, and in other embodiments, the first portion 130A1 of the optical pattern 130A may be further filled into the second groove 120g2 of the packaging structure 120, or the second portion 130A2 may be further filled into the first groove 120g1 of the packaging structure 120. Figure 6 The disclosed content (ie, the interface between the first portion 130A1 and the second portion 130A2 of the optical pattern 130A is aligned with the bottom surface 120s1 of the groove of the packaging structure 120 ) is limited.

[0095] In summary, in a light source module of one embodiment of the present invention, the light-emitting element is overlapped and arranged at the geometric center of the first groove of the packaging structure, and the first groove is filled with an optical pattern. Through the partial penetration and partial reflection characteristics of the optical pattern, the forward light output of the light-emitting element can be adjusted and the dark spot phenomenon formed after part of the light is reflected by the optical pattern can be improved. On the other hand, a second groove connected to the first groove is provided on one side of the light-emitting element, and the above-mentioned optical pattern further extends into the second groove. Accordingly, most of the light can be deflected to the side area of ​​the light-emitting element relative to the second groove, so as to effectively increase the light output of a specific area, while preventing the light from being transmitted to the light output area of ​​the adjacent light-emitting element.

[0096] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A light source module, characterized in that: include: substrate; A light emitting element is disposed on the surface of the substrate; A packaging structure, arranged on the surface of the substrate and covering the light-emitting element, the packaging structure having a first groove and a second groove that are connected, the light-emitting element being located between the first groove and the substrate, and the second groove being located between the first groove and the substrate, wherein a vertical projection of an area occupied by the first groove on the substrate has a geometric center, the light-emitting element is located at the geometric center, and a vertical projection of an area occupied by the second groove on the substrate does not overlap with the geometric center, and the vertical projections of the areas occupied by the first groove and the second groove on the substrate completely overlap with a vertical projection of the packaging structure on the substrate; as well as The optical pattern is arranged in the first groove and the second groove and has the characteristics of partial transmission and partial reflection. The packaging structure surrounds the optical pattern.

2. The light source module according to claim 1, characterized in that: A vertical projection of the packaging structure on the substrate has a symmetry axis, the symmetry axis passes through the geometric center, and the second groove and the light-emitting element are arranged along the axial direction of the symmetry axis.

3. The light source module according to claim 2, characterized in that: The packaging structure also has a first side edge and a second side edge opposite to each other in the axial direction of the symmetry axis, a first distance between the first side edge and the geometric center, a second distance between the second side edge and the geometric center, and the first distance is smaller than the second distance.

4. The light source module according to claim 3, characterized in that: A ratio of the first distance to the second distance is less than 0.

8.

5. The light source module according to claim 2, characterized in that: The packaging structure further has an edge line defining the first groove, the edge line and the geometric center have a distance D in the axial direction of the symmetry axis, the area occupied by the second groove has a width W in the axial direction of the symmetry axis, and satisfies W <D。 6. The light source module according to claim 5, characterized in that: The light emitting element has an element length L in the axial direction of the symmetry axis, and the packaging structure further has a groove bottom surface defining the second groove, and the groove bottom surface has a width W' in the axial direction of the symmetry axis, and satisfies W' <D-(L / 2)。 7. The light source module according to claim 6, characterized in that: The packaging structure and the light-emitting element have a maximum thickness T and an element thickness t respectively in the normal direction of the surface of the substrate, and a virtual connecting line with the shortest spacing between the edge line and the light-emitting element has an angle θ with the normal direction of the surface of the substrate, and satisfies D=L / 2+(Tt)·tanθ.

8. The light source module according to claim 1, characterized in that: The packaging structure also has a groove bottom surface defining the first groove, the light emitting element has a top surface facing the first groove, and a distance between the groove bottom surface of the packaging structure and the top surface of the light emitting element is greater than 0.

9. The light source module according to claim 1, characterized in that: The packaging structure also has an edge line surrounding the first groove and the second groove and a groove bottom surface defining the second groove, the distance between the edge line and the surface of the substrate defines the maximum thickness of the packaging structure in a direction perpendicular to the substrate, and there is a distance between the groove bottom surface and the edge line in a direction perpendicular to the substrate, and the distance is less than or equal to the maximum thickness of the packaging structure.

10. The light source module according to claim 1, characterized in that: The optical pattern includes a first portion and a second portion, the second portion is disposed between the first portion and the substrate, the first portion has a plurality of reflective particles, and the second portion has a plurality of wavelength conversion particles.

11. The light source module according to claim 10, characterized in that: The packaging structure also has a ridge surrounding the first groove and the second groove and a groove bottom surface defining the second groove, the first part of the optical pattern contacts the groove bottom surface, and there is a distance d between the groove bottom surface and the ridge in a direction perpendicular to the substrate, the second part has a thickness t' in a direction perpendicular to the substrate, and satisfies t'<2d / 3.

12. The light source module according to claim 1, characterized in that: The light transmittance of the optical pattern is between 10% and 50%.

13. The light source module according to claim 1, characterized in that: The optical pattern comprises: a light-transmitting substrate; and A plurality of reflective particles are dispersedly arranged in the light-transmitting substrate.

14. The light source module according to claim 13, characterized in that: The material of the plurality of reflective particles includes silicon dioxide, titanium dioxide, metal material or a combination thereof.

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