Patent Description:
As non-self-illuminating displays such as LED displays are applied more and more widely, the design of backlight modules also needs to be adjusted to cope with the various applications. To satisfy the demands for a high dynamic range (HDR) and a high contrast in display panel products, the backlight modules need to be capable of local dimming. Therefore, products adopting direct type backlight modules as the main light source framework have gradually become the mainstream on the market. Since such backlight module is expected to be thinner (e.g., an optical distance less than <NUM> millimeters), a light emitting device is usually covered by a package layer having a reflective member or a reflective structure, so that light may be output uniformly when being emitted through the light output surface of the backlight module.

However, when being transmitted within the package layer, some light beams emitted by the light emitting device still undergo multiple total reflections and are transmitted laterally (e.g., in a direction perpendicular to the light output direction) to an adjacent or even remote light source (i.e., another light emitting device). As a result, a halo effect is generated on the periphery of the light output region of the light emitting device, which blurs the periphery of the displayed image and thus deteriorates the overall display quality (e.g., display contrast). Meanwhile, when provided with the reflective member or the reflective structure, a reflective dark spot tends to be generated in a region in which the light output surface of the backlight module is overlapped with the light emitting device, and the overall light output uniformity may be affected. Therefore, how to facilitate the light output uniformity of an ultra-thin direct type backlight module has become an issue to work on. <CIT> discloses a light-emitting device including a light-emitting structure with a side surface, and a reflective layer covering the side surface. The light-emitting structure has a first light-emitting angle and a second light-emitting angle. The difference between the first light-emitting angle and the second light-emitting angle is larger than <NUM>°. <CIT> discloses a light-emitting device package including a package body including a mounting region at an upper portion thereof; a lead frame below the package body; a semiconductor light-emitting device in the mounting region and electrically connected to the lead frame; a top layer attached to a top surface of the semiconductor light-emitting device, the top layer including a red phosphor; and a molding layer in the mounting region, the molding layer covering the top layer and including a short-wavelength phosphor having a peak emission wavelength that is shorter than a peak emission wavelength of the red phosphor, wherein the top layer exposes a side surface of the semiconductor light-emitting device, and the molding layer is in contact with the side surface of the semiconductor light-emitting device. <CIT> discloses an LED emitter using a molded lens with phosphor material embedded in a circumferential trench to generate a batwing beam pattern. After the lens is molded over a package substrate with connected LED dies thereon, the phosphor material is molded, injected, or dispensed into a circumferential trench.

The present invention is provided in the appended claims. The following disclosure serves a better understanding of the present invention. Accordingly, the disclosure provides a light source module capable of effectively increasing the total light output and the light output uniformity of a specific light output region.

A light source module according to an embodiment of the invention is defined in claim <NUM>.

Based on the above, in the light source module according to an embodiment of the invention, the light emitting device is disposed to be overlapped with the geometric center of the first groove of the package structure, and the optical pattern is filled into the first groove. With the optical pattern being transflective, the forward light output of the light emitting device may be adjusted, and the dark spot phenomenon which occurs after some of the light beams are reflected by the optical pattern may be alleviated. Meanwhile, the second groove connected with the first groove is disposed on a side of the light emitting device, and the optical pattern further extends into the second groove. Accordingly, the majority of the light beams may be deflected to a region of the light emitting device on a side opposite to the second groove. Thus, the light output of a specific region may be effectively increased, while the light beams may be prevented from being transmitted to the light output region of the adjacent light emitting device.

Reference will now be made in detail to the present preferred embodiments of the invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers are used in the drawings and the description to refer to the same or like parts.

It is to be understood that both the foregoing and other detailed descriptions, features and advantages are intended to be described more comprehensively by providing an embodiment accompanied with figures hereinafter. The language used to describe the directions such as up, down, left, right, front, back or the like in the reference drawings is regarded in an illustrative rather than in a restrictive sense. Thus, the language used to describe the directions is not intended to limit the scope of the disclosure.

<FIG> is a schematic top view illustrating a light source module according to a first embodiment of the invention. <FIG> is a schematic cross-sectional view of the light source module of <FIG>. <FIG> is a diagram illustrating an illuminance distribution when the light source module of <FIG> is not provided with an optical film. <FIG> is a diagram illustrating an illuminance distribution when the light source module of <FIG> is provided with an optical film. It is noted that <FIG> corresponds to a cross-sectional line A-A' of <FIG>. For the clarity of illustration, an optical film <NUM> shown in <FIG> is omitted in <FIG>.

Referring to <FIG> and <FIG>, the light source module <NUM> includes a substrate <NUM>, a plurality of light emitting devices <NUM>, and a plurality of package structures <NUM>. The light emitting devices <NUM> and the package structures <NUM> are disposed on a surface <NUM> of the substrate <NUM>. In addition, the package structures <NUM> respectively cover the light emitting devices <NUM>. For example, the light emitting devices <NUM> may be arranged into an array on the substrate <NUM>, such as being arranged into a plurality of columns and rows in X and Y directions. In addition, the package structures <NUM> overlapped with the light emitting devices <NUM> are arranged to be connected with each other. The material of the package structure <NUM> includes a plastic material, a resin material (e.g., acrylic resin), or other suitable transparent package materials.

It should be noted that the contents shown in <FIG> merely serve for an illustrative purpose. The disclosure is not particularly limited by the arrangements of the light emitting devices <NUM> and the package structures <NUM>. In other embodiments, the light emitting devices <NUM> and the package structures <NUM> may also be arranged based on the actual optical design or needs. For example, two adjacent package structures <NUM> may be disposed separately from each other on the substrate <NUM>. Meanwhile, in the embodiment, an example in which each package structure <NUM> covers one light emitting device is described for an illustrative purpose. However, the disclosure is not limited thereto. In other embodiments, each package structure <NUM> may cover two or more light emitting devices <NUM>, such as three light emitting devices respectively emitting red light, green light, and blue light.

In the embodiment, the light emitting device <NUM> may be a light emitting diode (LED), such as a mini LED or a micro LED. It should be noted that the orthogonal projection of the package structure <NUM> on the surface <NUM> of the substrate <NUM> has an outer profile that is substantially rectangular. However, the disclosure is not limited thereto. In other embodiments, the outer profile of the orthogonal projection of the package structure on the substrate <NUM> may also be arc-shaped, polygonal, or in other suitable shapes. Meanwhile, in the embodiment, the orthogonal projection of the package structure <NUM> on the surface <NUM> of the substrate <NUM> has an symmetric axis SA. In other words, the two portions of the package structure <NUM> on the two sides with respect to the symmetric axis SA are in mirror symmetry.

In order to deflect most of the light beams from the light emitting device <NUM> to a region on a side of the light emitting device <NUM>, the package structure <NUM> exhibits an asymmetric structural distribution in a specific direction. For example, the package structure <NUM> of the embodiment has an asymmetric groove disposed to be overlapped with the light emitting device <NUM>. In addition, the asymmetric groove exhibits asymmetry in the axial direction (e.g., X direction) of the symmetric axis SA.

Specifically, the asymmetric groove may be formed by a first groove 120g1 and a second groove g2 connected to each other. The second groove 120g2 is located between the first groove 120g1 and the substrate <NUM>. In the embodiment, the orthogonal projection of the region occupied by the first groove 120g1 on the substrate <NUM> has a geometric center C. The symmetric axis SA of the package structure <NUM> passes through the geometric center C, and the orthogonal projection of the region occupied by the second groove 120g2 on the substrate <NUM> is not overlapped with the geometric center C.

More specifically, the orthogonal projection of the region occupied by the second groove 120g2 on the substrate <NUM> is overlapped with the symmetric axis SA and is located between the geometric center C and a first edge 120e1. In addition, the package structure <NUM> is also provided with the first edge 120e1 and a second edge 120e2 opposite to each other in the axial direction of the symmetric axis SA. A distance L1 is provided between the first edge 120e1 and the geometric center C, and a second distance L2 is provided between the second edge 120e2 and the geometric center C. In addition, the first distance L1 is shorter than the second distance L2. In other words, the asymmetric groove is provided in the package structure <NUM> at a position close to the first edge 120e1. For example, in the embodiment, a ratio of the first distance L1 to the second distance L2 may be less than <NUM>. Accordingly, the package structure <NUM> may exhibit favorable asymmetry in the axial direction of the symmetric axis SA.

In the embodiment, the light emitting device <NUM> is disposed on the substrate <NUM> at a position overlapped with the geometric center C. In other words, the second groove 120g2 and the light emitting device <NUM> are arranged along the axial direction of the symmetric axis SA of the package structure <NUM>. In order to deflect most of the light beams from the light emitting device <NUM> to a region on a specific side of the light emitting device <NUM> (such as the right-side region of the light emitting device <NUM> shown in <FIG>), the light source module <NUM> further includes an optical pattern <NUM> filled into the first groove 120g1 and the second groove 120g2. In addition, the optical pattern <NUM> is transflective. For example, the optical pattern <NUM> may include a transmissive base material <NUM> and a plurality of reflective particles <NUM> dispersedly distributed in the transmissive base material <NUM>. The material of the transmissive base material <NUM> includes, for example, acrylic resin, epoxy resin, hexamethyldisiloxane (HMDSO), or other suitable polymer materials. The material of the reflective particle <NUM> includes silicon dioxide (SiO<NUM>), titanium dioxide (TiO<NUM>), a metal material, or a combination thereof, or other materials with a suitable reflectivity.

By modulating the doping concentration of the reflective particles <NUM>, the transmittance of the optical pattern <NUM> may be adjusted between <NUM>% and <NUM>% (or the concentration of the reflective particles <NUM> of the optical pattern <NUM> between <NUM>% and <NUM>%), so as to satisfy the needs of different optical designs (e.g., having different asymmetric output light shapes). For example, a light beam LB1 transmitted from the light emitting device <NUM> toward the second groove 120g2 is transmitted toward a side (e.g., the right side in <FIG>) of the light emitting device <NUM> away from the second groove 120g2 after being reflected by the reflective particles <NUM>. Similarly, a light beam (not shown) transmitted from the light emitting device <NUM> toward the first groove 120g1 may be transmitted toward the substrate <NUM> after being reflected by the reflective particles <NUM> in the first groove 120g1. Since the substrate <NUM> of the embodiment is a reflective substrate, the light beam reflected by the reflective particles <NUM> in the first groove 120g1 may be further transmitted laterally within the package structure <NUM> through the reflection of the substrate <NUM>. However, the disclosure is not limited thereto.

More specifically, the package structure <NUM> is further provided with a ridge RL1 defining the first groove 120g1. An included angle θ is provided between a virtual connection line IL, as a shortest interval between the ridge RL1 and the light emitting device <NUM>, and the normal direction of the surface <NUM> of the substrate <NUM>, and an arrangement relationship between the package structure <NUM> and the light emitting device <NUM> satisfies: D=L/<NUM>+(T-t)•tanθ, wherein D represents a distance between the ridge RL1 and the geometric center C in the axial direction (e.g., X direction) of the symmetric axis SA, L represents a device length of the light emitting device <NUM> in the axial direction of the symmetric axis SA, t represents a device thickness of the light emitting device <NUM> in the normal direction of the surface <NUM> of the substrate <NUM>, and T represents a maximum thickness of the package structure <NUM> in the normal direction of the surface <NUM> of the substrate <NUM>.

The included angle θ is determined according to a ratio between the refractive indices of the material of the package structure <NUM> and air. In the embodiment, the refractive index of the material of the package structure <NUM> may range between <NUM> and <NUM>. Correspondingly, the included angle θ may range between <NUM> degrees and <NUM> degrees. Accordingly, the light beams of the light emitting device <NUM> may exhibit a favorable asymmetric light shape after being emitted out of the package structure <NUM>. In addition to reflecting some of the light beams (e.g., the light beam LB1) from the light emitting device <NUM> through the reflective particles <NUM> of the optical pattern <NUM>, the refractive index of the package structure <NUM> may also be optionally set to be greater than the refractive index of the transparent base material <NUM> of the optical pattern <NUM>. In this way, some other light beams (e.g., the light beam LB2) may undergo total reflection at the interface between the package structure <NUM> and the optical pattern <NUM>, so as to facilitate the chance of a light beam being laterally transmitted in the package structure <NUM>.

For example, a groove bottom surface 120s1 defining the first groove 120g1 of the package structure <NUM> has a cross-sectional surface (e.g., a XZ plane or a YZ plane) whose profile may exhibit an arc line segment, and the arc line segment extends from the ridge RL1 to right above the light emitting device <NUM>. The curvature change of the arc line segment may be adjusted according to different total reflection requirements. The disclosure is not particularly limited in this regard. Meanwhile, since the transmittance of the optical pattern <NUM> is adjustable, the light output of the light emitting device <NUM> in the forward direction (e.g., Z direction) is adjustable. In addition, the dark spot phenomenon which occurs after some light beams (in the forward direction) are reflected by the optical pattern <NUM>. For example, some light beams (e.g., a light beam LB3) transmitted from the light emitting device <NUM> toward the first groove 120g1 may directly pass through the optical pattern <NUM> without being reflected back to the package structure <NUM> by the reflective particles <NUM>.

In the embodiment, the profile of the orthogonal projection of the region occupied by the first groove 120g1 on the surface <NUM> of the substrate <NUM> is circular, for example, and the center of the circle is located at the geometric center C, for example. In other words, in the embodiment, the width of the orthogonal projection of the region occupied by the first groove 120g1 on the surface <NUM> of the substrate <NUM> in the axial direction of the symmetric axis SA is a value that is two times of a distance D (e.g., 2D shown in <FIG>). However, the disclosure is not limited thereto. According to other embodiments, the profile of the orthogonal projection of the region occupied by the first groove on the surface <NUM> of the substrate <NUM> may also be circle-like, elliptical, or ellipse-like.

The profile of the orthogonal projection of the region occupied by the second groove 120g2 on the surface <NUM> of the substrate <NUM> is, for example, semi-circle-like, and has a width W shorter than the distance D in the axial direction of the symmetric axis SA. However, the disclosure is not limited thereto. Meanwhile, the package structure <NUM> further has a groove bottom surface 120s2 defining the second groove 120g2. The orthogonal projection of the groove bottom surface 120s2 on the surface <NUM> of the substrate <NUM> has a width W' in the axial direction of the symmetric axis SA and satisfies W'< D-(L/<NUM>). In the embodiment, in the package structure <NUM>, the region surrounded by the ridge line RL2 defining the second groove 120g2 and the groove bottom surface 120s2 are not overlapped with the light emitting device in the normal direction of the surface <NUM> of the substrate <NUM>. However, the disclosure is not limited thereto. In other embodiments, the light emitting device <NUM> may be partially overlapped with the region surrounded by the ridge RL2 defining the second groove 120g2 in the package structure <NUM> in the normal direction of the surface <NUM> of the substrate <NUM>, but may not be overlapped with the groove bottom surface 120s2.

In the embodiment, the second groove 120g2 may have a high aspect ratio. That is, the sidewall of the second groove 120g2 is defined to be steeper in the package structure <NUM>. Accordingly, the light beams from the light emitting device <NUM> may be effectively deflected to the region of the light emitting device <NUM> on a side opposite to the second groove 120g2, so as to increase the light output of a specific region while preventing the light beams from being transmitted to the light output region of the adjacent light emitting device <NUM>.

In the embodiment, the package structure <NUM> further includes, in accordance with the claimed invention, a third groove 120g3, and the first groove 120g1 is optionally connected between the second groove 120g2 and the third groove 120g3. In other words, the asymmetric groove of the embodiment is a combination of the first groove 120g1, the second groove 120g2, and the third groove 120g3. It should be noted that the optical pattern <NUM> is not filled into the third groove 120g3. However, the disclosure is not limited thereto. In other embodiments, the optical pattern <NUM> may also be filled into a portion of the region occupied by the third groove 120g3.

Specifically, the package structure <NUM> further has, in accordance with the invention, a ridge RL3 defining the third groove 120g3. In addition, the ridge RL3 surrounds the first groove 120g1 and the second groove 120g2. The orthogonal projections of the regions occupied by the first groove 120g1 and the second groove 120g2 on the surface <NUM> of the substrate <NUM> are, in accordance with the invention, completely overlapped with the orthogonal projection of the region occupied by the third groove 120g3 on the surface <NUM> of the substrate <NUM>. More specifically, the area of the orthogonal projection of the region occupied by the third groove 120g3 on the surface <NUM> of the substrate <NUM> is greater than the areas of the orthogonal projections of the regions occupied by the first groove 120g1 and the second groove 120g2 on the surface <NUM> of the substrate <NUM>.

In order to effectively deflect the light beams transmitted to one side of the light emitting device <NUM> (e.g., the left side of the light emitting device <NUM> shown in <FIG>) to the other side of the light emitting device <NUM> in the opposite direction (e.g., the right side of the light emitting device <NUM> shown in <FIG>), it is defined in the package structure <NUM> the distance between the groove bottom surface 120s1 defining the first groove 120g1 and a top surface 110t of the light emitting device <NUM> needs to be greater than <NUM> to ensure the reflective effect of the portion of the optical pattern <NUM> in the second groove 120g2. It should be understood that the distance between the groove bottom surface 120s1 and the top surface 110t of the light emitting device <NUM> may be adjusted based on the actual light shape needs.

Meanwhile, in the normal direction of the surface <NUM> of the substrate <NUM>, the distance between the ridge RL3 and the surface <NUM> of the substrate <NUM> defines a maximum thickness T of the package structure <NUM>. A distance d is set between the groove bottom surface 120s2 and the ridge RL3, and the distance d is shorter than the maximum thickness T of the package structure <NUM>. In other words, a gap may be provided between the groove bottom surface 120s2 and the surface <NUM> of the substrate <NUM>, and the gap may allow some of the light beams to pass through to ensure the light output uniformity of the other side. However, the disclosure is not limited thereto. Based on other embodiments, the distance d between the groove bottom surface 120s2 and the ridge RL3 may also be optionally equal to the maximum thickness T of the package structure <NUM>. In other words, the first groove 120g1, the second groove 120g2, and the third groove 120g3 connected to each other may also penetrate through the package structure <NUM>, and the optical pattern <NUM> may directly cover the surface <NUM> of the substrate <NUM>.

In the axial direction of the symmetric axis SA, the slope change of a surface 120as of the package structure <NUM> on one side of the asymmetric groove is different from the slope change of a surface 120bs of the package structure <NUM> on the other side of the asymmetric groove. For example, the slope of the surface 120as of the package structure <NUM> on one side of the light emitting device <NUM> gradually increases from the ridge RL3 toward the first edge 120e1 at a first changing rate, and the slope of the surface 120bs of the package structure <NUM> on the other side of the light emitting device <NUM> gradually changes from the ridge RL3 toward the second edge 120e2 at a second changing rate. In addition, the second changing rate is lower than the first changing rate. Since the light emitting device <NUM> is disposed at a position close to the first edge 120e1, the surface 120bs with a mild slope is able to increase the chance of laterally transmitting the light beams in the package structure <NUM> and help increase the light output uniformity of the light emitting device <NUM> toward a specific side.

Referring to <FIG>, with the arrangement of the package structure <NUM> and the optical pattern <NUM>, the output light shape of the light emitting device <NUM> exhibits asymmetry in X direction (i.e., the axial direction of the symmetric axis SA of the package structure <NUM>), while exhibiting symmetry in Y direction. As shown in the illuminance distribution curve on the right side of <FIG>, the majority of the light output of the light emitting device <NUM> on the XZ plane concentrates on a specific side (e.g., the lower side with respect to the horizontal broken line shown in <FIG>). Comparatively, as shown in the illuminance distribution curve on the lower side of <FIG>, the light output of the light emitting device <NUM> on the YZ plane is evenly distributed on two opposite sides of the light emitting device <NUM> (e.g., the left and right sides with respect to the vertical broken line in <FIG>).

Referring to <FIG> again, the light source module <NUM> of the embodiment may further include an optical film <NUM> disposed to be overlapped with the light emitting devices <NUM> and the package structures <NUM>. The optical film <NUM> may be a prism sheet, a diffuser, a combination of a plurality of layers of the aforementioned, or other optical films suitable for facilitating uniformity. However, the disclosure is not limited thereto. In other embodiments, the optical film <NUM> may also be a wavelength conversion film, and the wavelength conversion film includes, for example, a quantum dot film, a phosphor film, etc. For example, in the embodiment, the optical film <NUM> has a prism sheet having a plurality of prism structures (not shown), for example. In addition, the prism structures may serve to deflect the light beams from the package structure <NUM> to a predetermined view angle (e.g., positive view angle) range, so as to increase the light output of the light source module <NUM> in the view angle range. As shown in <FIG>, under the acting of the optical film <NUM>, the output light shape of the light emitting device <NUM> is at least symmetric in two axial directions (e.g., X and Y directions). More specifically, the light source module <NUM> of the embodiment may serve as a backlight module with a high light collecting property.

Some other embodiments will be provided in the following to describe the invention in greater detail. In the following, the same components shall be labeled with the same reference symbols, and descriptions with the same technical contents will be omitted. For the omitted part, reference is made to the contents described above and will not be repeated in the following.

<FIG> is a schematic top view illustrating a package structure according to another embodiment of the invention. <FIG> is a schematic top view illustrating a package structure according to yet another embodiment of the invention. Referring to <FIG>, a package structure 120A of the embodiment differs from the package structure <NUM> of <FIG> in that the second groove has a different configuration. Specifically, the profile of the orthogonal projection of the region occupied by a second groove 120g2A of the package structure 120A on the surface <NUM> (as shown in <FIG>) of the substrate <NUM> is meniscus-like. Specifically, in the package structure 120A, a portion of a ridge RL2A defining the second groove 120g2A is curved toward the first edge 120e1 of the package structure 120A.

Nevertheless, the disclosure is not limited thereto. In yet another embodiment shown in <FIG>, a ridge RL2B defining a second groove 120g2B of a package structure 120B may also be entirely curved toward the second edge 120e2 of the package structure 120B. In other words, the profile of the orthogonal projection of the second groove 120g2B of <FIG> on the surface <NUM> (as shown in <FIG>) of the substrate <NUM> may also be rugby ball-like.

Since the configuration relationship of the package structure 120A shown in <FIG> (or the package structure 120B shown in <FIG>), the optical pattern, and the light emitting device is similar to that in the light source module <NUM> of <FIG> and <FIG>, reference is made to the preceding paragraphs for details in this regard, and the same contents will not be repeated in the following.

<FIG> is a schematic cross-sectional view illustrating a light source module according to a second embodiment of the invention. Referring to <FIG>, a light source module 10A of the embodiment differs from the light source module <NUM> of <FIG> in that the composition of the optical pattern is different. Specifically, an optical pattern 130A of the light source module 10A includes a first portion 130A1 and a second portion 130A2. The second portion 130A2 is disposed between the first portion 130A1 and the substrate <NUM>. It should be noted that the first portion 130A1 of the optical pattern 130A is provided with the transmissive base material <NUM> and the reflective particles <NUM> dispersedly distributed in the transmissive base material <NUM>, whereas the second portion 103A2 is provided with a transmissive base material <NUM> and a plurality of wavelength conversion particles <NUM> dispersedly distributed in the transmissive base material <NUM>.

In the embodiment, the materials of the transmissive base material <NUM> of the first portion 130A and the transmissive base material <NUM> of the second portion 130A2 may be optionally the same. However, the disclosure is not limited thereto. Since the function of the reflective particles <NUM> of the first portion 130A1 is similar to that of the reflective particles <NUM> of <FIG>, reference is made to the preceding paragraphs for details in this regard, and the same contents will not be repeated in the following.

For example, the wavelength conversion particles <NUM> of the second portion 130A2 of the optical pattern 130A may have a single particle size or multiple particle sizes to satisfy different light mixing needs. In the 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 package structure <NUM>. The second portion 130A2 has a thickness t' in the normal direction of the surface <NUM> of the substrate and satisfies t'< 2d/<NUM>, wherein d represents a distance between the groove bottom surface 120s2 and the ridge RL3 in the normal direction of the surface <NUM> of the substrate <NUM>. Accordingly, the light mixing effect of the light beams emitted from the package structure <NUM> is optimized.

However, the invention is not limited thereto. In other embodiments, the first portion 130A1 of the optical pattern 130A may be further filled into the second groove 120g2 of the package structure <NUM>, or the second portion 130A2 may be further filled into the first groove 120g1 of the package structure <NUM>. In other words, the invention is not limited to the contents disclosed in <FIG> (i.e., the interface between the first portion 130A1 and the second portion 130A2 of the optical pattern 130A is aligned to the groove bottom surface 120s1 of the package structure <NUM>).

Claim 1:
A light source module (<NUM>), comprising:
a substrate (<NUM>);
a light emitting device (<NUM>), disposed on a surface (<NUM>) of the substrate (<NUM>) and configured to emit a light beam;
a package structure (<NUM>, 120A, 120B), disposed on the surface (<NUM>) of the substrate (<NUM>) and covering the light emitting device (<NUM>), wherein the package structure (<NUM>, 120A, 120B) has a first groove (120g1) and a second groove (120g2, 120g2A, 120g2B) connected to each other, the package structure (<NUM>, 120A, 120B) is transparent to the light beam, the light emitting device (<NUM>) is located between the first groove (120g1) and the substrate (<NUM>), the second groove (120g2, 120g2A, 120g2B) is located between the first groove (120g1) and the substrate (<NUM>), an orthogonal projection of a region occupied by the first groove (120g1) on the substrate (<NUM>) has a geometric center (C), the light emitting device (<NUM>) is located at the geometric center (C), and an orthogonal projection of a region occupied by the second groove (120g2, 120g2A, 120g2B) on the substrate (<NUM>) is not overlapped with the geometric center (C); and
an optical pattern (<NUM>, 130A), disposed in the first groove (120g1) and the second groove (120g2, 120g2A, 120g2B) and being transflective,
the light source module (<NUM>) being characterized in that
the package structure further comprises a third groove (120g3) defined by a ridge (RL3), wherein the ridge (RL3) surrounds the first groove and the second groove,
the orthogonal projections of the regions occupied by the first groove (120g1) and the second groove (120g2, 120g2A, 120g2B) on the surface (<NUM>) of the substrate (<NUM>) are completely overlapped with the orthogonal projection of the region occupied by the third groove (120g3) on the surface (<NUM>) of the substrate (<NUM>), and that
the package structure (<NUM>, 120A, 120B) surrounds the optical pattern (<NUM>, 130A).