CN101858508B - Light source module - Google Patents

Abstract

An embodiment of the present invention provides a light source module, which includes a light guide plate and a light source device. The light guide plate has a light emitting surface, a light reflecting surface opposite to the light emitting surface, and at least one light incident surface connected between the light emitting surface and the light reflecting surface. The light guide plate has a plurality of light reflecting structures on the light reflecting surface. Each light reflecting structure includes a closed light action area and a plurality of protrusions located in the light action area, wherein the light action area is not coplanar with the light reflecting surface, and these protrusions extend toward the outside of the light guide plate. The light source device is arranged corresponding to the light incident surface. The light source device provides a light beam that enters the light guide plate from the light incident surface, and after being changed in direction by one of the protrusions on the light reflecting surface, it is emitted from the light guide plate from the light emitting surface. Through the embodiment of the present invention, a better light output efficiency can be provided.

Description

Light source module

technical field

The present invention relates to a light source module, in particular to a light source module with better light output efficiency.

Background technique

With the vigorous development of flat-panel display technology, liquid crystal display (LCD) has gradually become the mainstream of display technology, which is widely used in daily life and replaces the traditional cathode ray tube (CRT) . Since the liquid crystal panel in the liquid crystal display does not emit light by itself, it is necessary to use a light source module to provide a backlight. The light source module can be divided into direct type light source module and side light type light source module according to the arrangement position of the light emitting components. The key factor of the side light type light source module can guide the light from the side to the front to form a surface light source is that It has a light guide plate.

FIG. 1A is a top view of a conventional side-illuminated light source module, and FIG. 1B is a cross-sectional view of the light source module along line AA' of FIG. 1A . Please refer to FIG. 1A and FIG. 1B at the same time. The light source module 100 includes a light source 110 , a light guide plate 120 , a reflection sheet 130 and an optical diffusion sheet 140 . The light guide plate 120 has an upper surface 122, a lower surface 124 opposite to the light emitting surface 122, and a light incident surface 126 connecting the upper surface 122 and the lower surface 124, wherein the upper surface 122 and the lower surface 124 are, for example, perpendicular to the light incident surface. Face 126.

In the light source module 100 , a light source 110 is usually disposed beside the light incident surface 126 of the light guide plate 120 , wherein the light source 110 may be a light emitting diode or a cold cathode fluorescent lamp. The lower surface 124 of the light guide plate 120 has a plurality of protrusions 121 , wherein each protrusion 121 may have the same height. After the light beam 112 from the light source 110 passes through the light incident surface 126 and enters the light guide plate 120, the total reflection phenomenon of the light beam 112 in the light guide plate 120 is destroyed by the above-mentioned protrusion 121, so that the light beam 112 in the light guide plate 120 can be guided , and can uniformly emit from the upper surface 122 and leave the light guide plate 120 .

Generally speaking, the light source module 100 usually arranges a reflective sheet 130 on the lower surface 124 of the light guide plate 120, so that part of the light beam 112 leaving through the lower surface 124 can be reflected and transmitted back into the light guide plate 120, so as to improve the light source. The brightness of the backlight of the module 100. In addition, in order to improve the overall light uniformity of the light source module 100 , the light source module 100 can also be provided with an optical diffusion sheet 140 on the upper surface 122 of the light guide plate 120 to improve the uniformity of the backlight.

However, the light source module 100 adopts the light reflection structure of the light guide plate (that is, the raised portion 121) as shown in FIG. To further improve the brightness of the backlight of the light source module is the goal that various manufacturers are striving for.

Contents of the invention

The invention provides a light source module with better light extraction efficiency.

The invention provides a light source module, which includes a light guide plate and a light source device. The light guide plate has a light exit surface, a light reflection surface opposite to the light exit surface, and at least one light incident surface connected between the light exit surface and the light reflection surface, and the light guide plate has a plurality of light reflection structures on the light reflection surface. Each light reflection structure includes a closed light action area and a plurality of protrusions located in the light action area, wherein the light action area is not coplanar with the light reflection surface, and these protrusions extend toward the light guide plate, and each light reflection The structure is composed of multiple dot patterns, and any two adjacent dot patterns partially overlap. The light source device is arranged corresponding to the light incident surface. The light source device provides a light that enters the light guide plate from the light incident surface, is redirected by one of the protrusions on the light reflection surface, and then exits the light guide plate from the light exit surface.

In an embodiment of the present invention, each dot pattern is a depression on the light reflecting surface, and an edge of each dot pattern protrudes from the light reflecting surface. The joint area of these dot patterns forms the light action area, and the edges of the intersecting areas of these dot patterns form these protrusions.

In an embodiment of the present invention, each dot pattern is a protrusion on the light reflecting surface, and an edge of each dot pattern is recessed on the light reflecting surface. The joint area of these dot patterns forms a light action area, and the edge of the intersection area of these dot patterns forms a plurality of grooves separating these protrusions.

In an embodiment of the present invention, the dot patterns constituting each light reflection structure are arranged along a straight line, and the extending direction of the straight line is substantially perpendicular to the traveling direction of the light.

In an embodiment of the invention, each dot pattern is a circle.

In an embodiment of the present invention, each light reflective structure further includes a plurality of internal patterns respectively located in these dot patterns, and the edge of each internal pattern protrudes or is recessed on the light reflective surface.

In an embodiment of the invention, each internal pattern is circular.

In an embodiment of the present invention, the number of these dot patterns in each light reflection structure gradually increases along the direction away from the light source device.

In an embodiment of the present invention, the distance between any two adjacent light reflection structures gradually decreases along the direction away from the light source device.

The beneficial effect of the embodiments of the present invention is that the light source device of the present invention utilizes a plurality of light reflection structures on the light guide plate, and each light reflection structure includes a closed light action area and a plurality of protrusions located in the light action area, Therefore, when the light passes through the light guide plate to the light reflection structure on the light reflection surface, the light will be reflected by the protrusions and exit the light guide plate through the light exit surface, thereby improving the light output efficiency.

Description of drawings

FIG. 1A is a top view of a conventional side-illuminated light source module.

FIG. 1B is a cross-sectional view of the light source module shown along line AA' of FIG. 1A.

FIG. 2A is a schematic top view of a light source module according to an embodiment of the present invention.

Fig. 2B is a schematic cross-sectional view of the light source module shown along line BB' in Fig. 2A.

Fig. 2C is a schematic cross-sectional view of the light source module shown along line CC' in Fig. 2A.

Fig. 3A is a schematic cross-sectional view of another embodiment of the light source module shown along line BB' in Fig. 2A.

Fig. 3B is a schematic cross-sectional view of another embodiment of the light source module shown along line CC' in Fig. 2A.

FIG. 4 is a schematic diagram of partially overlapping dot patterns of the light reflection structure in FIG. 2A .

5 to 7 are schematic top views of different implementation forms of the arrangement of light reflection structures and the number of dot patterns in the light source module.

8A to 8E are schematic diagrams of different implementation forms of the light reflection structure in FIG. 2A .

[Description of main component symbols]

100, 200: light source module

110: light source

112: Beam

120, 210: light guide plate

121: Raised part

122: upper surface

124: lower surface

126: light incident surface

130, 230: reflective sheet

140, 240: optical diffuser

220: light source device

212: light emitting surface

214: light reflective surface

216: light incident surface

213: Light reflective structure

213a: Photoactive area

213b: Raised

215: dot pattern

215a: Protrusion

215b: Edge

217: Groove

219: Internal pattern

215c: depression

222: LED

M1: Union area

M2: intersection area

L1: light

P1: Extension direction

X, Y: axis

r: radius

d: diameter length

d1, d2: spacing

Detailed ways

2A is a schematic top view of a light source module according to an embodiment of the present invention, FIG. 2B is a schematic cross-sectional view of the light source module shown along line BB' in FIG. 2A , and FIG. 2C is a light source module shown along line CC' in FIG. 2A 2A is a schematic cross-sectional view of FIG. 2A , wherein, for convenience of illustration, FIG. 2A only shows the light source device and the light guide plate and omits possible optical components located above and below the light guide plate. Please refer to FIG. 2A , FIG. 2B and FIG. 2C at the same time. The light source module 200 of this embodiment includes a light guide plate 210 and a light source device 220 .

The light guide plate 210 has a light exit surface 212, a light reflection surface 214 opposite to the light exit surface 212, and at least one light incident surface 216 connected between the light exit surface 212 and the light reflection surface 214, and the light guide plate 210 has a plurality of light The reflective structure 213 is on the light reflective surface 214 . Each light reflection structure 213 includes a closed light action area 213a and a plurality of protrusions 213b located in the light action area 213a, wherein the light action area 213a is not in the same plane as the light reflection surface 214, and these protrusions 213b face the light guide plate 210 outside extension. In this embodiment, each light reflective structure 213 is composed of a plurality of dot patterns 215, and two adjacent dot patterns 215 may partially overlap or be tangent, as shown in FIG. 2A . From another point of view, each light reflection structure 213 may include more than two closed sub-patterns that intersect or tangent, and each sub-pattern may be regarded as the above-mentioned dot pattern 215 . In other words, the sub-patterns in each light-reflecting structure 213 can be recessed or protruded from the light-emitting surface 212 , depending on the forming method, and related descriptions can refer to the descriptions in the following paragraphs. In addition, each of the dot patterns 215 described in this embodiment can be equivalently regarded as the above-mentioned sub-patterns, and the related description can refer to the following description.

In the embodiment shown in FIG. 2B , each dot pattern 215 is, for example, a protrusion on the light reflecting surface 214 , and each dot pattern 215 may include a protrusion 215 a and an edge 215 b. In detail, the protruding portion 215a is located on the light reflecting surface 214 and extends outward from the light guide plate 210 to protrude from the light reflecting surface 214. Therefore, the protruding portion 215a is not coplanar with the light reflecting surface 214. A face refers to a coplanar plane. Since each dot pattern 215 is a convex structure, the edge 215 b of each dot pattern 215 is recessed on the light reflecting surface 214 . In addition, in each light reflective structure 213, these partially overlapping or tangential dot patterns 215 combined region M1 (also refer to the peripheral region M1 shown in FIG. 4 ) can form the light active region of the light reflective structure 213 213a, and the edge 215b of the intersection region M2 of these dot patterns 215 can form a plurality of grooves 217 separating these protrusions 213b, as shown in FIG. 2C.

In detail, the method of forming the structure of the above-mentioned protruding portion 215a can be to first use a laser beam (not shown) to make a spot on a steel plate (not shown), wherein the position of each laser spot is the same as that shown in FIG. 2A distribution, that is to say, the laser spots on the steel plate will partially overlap or be tangent to each other. Then, the light guide plate 210 as shown in FIG. 2B and FIG. 2C can be formed by stamping the steel plate on a light guide substrate. What needs to be explained here is that since the laser beam on the steel plate is laser ablated, the pattern formed on the steel plate will have a structure similar to a crater. In this way, when the steel plate is stamped on the light guide After the substrate is formed, a structure in which the edge 215b of the dot pattern 215 in FIG. 2B is recessed in the light reflecting surface 214 is formed.

However, in other embodiments, the manufacturing method of the light guide plate 210 may also be to directly use a laser beam to perform the aforementioned dotting process on a light guide substrate, so that the dot pattern 215 formed on the light guide plate 210 It will be a concave portion 215c located on the light reflecting surface 214, and the edge 215b of each dot pattern 215 will protrude from the light reflecting surface 214, as shown in FIGS. 3A and 3B, wherein FIG. 3B is a schematic cross-sectional view of another embodiment of the light source module shown along line CC' in FIG. 2A .

3A and FIG. 3B, since the laser beam is used to directly strike the light reflection surface 214 of the light guide substrate, the dot pattern 215 in each light reflection structure 213 formed by it can be seen. It is a concave hole on the light reflecting surface 214 , and the edge of each dot pattern 215 can protrude from the light reflecting surface 214 . In addition, the combined region M1 of the partially overlapping or tangent dot patterns 215 in each light reflective structure 213 can form the aforementioned light action area 213a, and the intersection region M2 of these partially overlapping or tangential dot patterns 215 ( Also refer to the edge 215b of the region M2) shown in FIG. 4 may be formed with a plurality of protrusions 213b.

Similarly, since the laser beam directly hitting the light guide substrate adopts the method of laser ablation, the pattern formed on the light guide plate 210 will have a structure similar to a crater, such as the dot pattern 215 in FIG. 3A The edge 215b protrudes from the structure of the light reflective surface 214 . It should be noted that the method of forming the light reflective structure 213 of this embodiment does not necessarily have to adopt the method of laser ablation, and general laser process, general etching process or other appropriate processes can also be used. In this way, there will be no The edge 215b forming the dot pattern 215 in FIG. 2B is recessed in the light reflecting surface 214 , or the edge 215b forming the dot pattern 215 in FIG. 3A is protruding from the light reflecting surface 214 .

In addition, the light source device 220 is disposed corresponding to the light incident surface 216 of the light guide plate 210 , as shown in FIG. 2A , FIG. 2B and FIG. 3A . The light source device 220 provides a light L1 entering the light guide plate 210 from the light incident surface 216, and after being redirected by one of the light reflection structures 213 (such as protrusions 213b) on the light reflection surface 214, it exits the light guide plate from the light exit surface 212. 210, as shown in FIG. 2B and FIG. 3B. In detail, since each light reflective structure 213 on the light guide plate 210 is composed of a plurality of dot patterns 215 partially overlapped or tangent, when the light L1 is transmitted in the light guide plate 210 to the structure located on the light reflective surface 214 When the light reflection structure 213 is used, the light L1 is easily totally reflected by the protrusion 213b and exits the light guide plate 210 through the light exit surface 212, thereby improving the light exit efficiency. In addition, if part of the light L1 passes through the light reflecting surface 214 and exits the light guide plate 210, the light source module 200 can be provided with a reflective sheet 230 on the light reflecting surface 214 to transmit the light L1 back to the light guide plate 210, so as to improve the light intensity. utilization rate. For example, if the light source module 200 adopts the above-mentioned light guide plate 210, it will not only increase its overall aperture ratio, but also increase its overall light output brightness. The experimental data shows that if the light source module 200 adopts the above-mentioned light guide plate 210 When the structure of the light guide plate 210 with overlapping dot patterns 215 is used, the overall light output brightness can be increased by at least 10.8% compared with the traditional light guide plate 120 as shown in FIG. 1A .

In other words, since the light L1 will be redirected by the protrusions 213b formed by partially overlapping or tangential dot patterns 215 and exit the light guide plate 210 through the light-emitting surface 212, therefore, the use of the light guide plate 210 of this embodiment can improve the light source. The light output efficiency of the module 200 as a whole. In this embodiment, the light source device 220 is illustrated by a plurality of light emitting diodes 222 arranged in an array, but it is not limited thereto. In other embodiments, the light source device 220 may also use cold cathode fluorescent tubes or other suitable light sources.

In this embodiment, the dot patterns 215 forming each light reflection structure 213 are arranged along a straight line, and the extending direction P1 of the straight line is substantially perpendicular to the traveling direction of the light L1, which means that the extending direction P1 is, for example, X axis direction, as shown in Figure 2A.

In addition, the degree of partial overlap of the dot patterns 215 in the light reflection structure 213 will affect the light output gain provided by the light source module 200 . The following will be illustrated with FIG. 4 as an example. In this embodiment, if the dot pattern 215 is a circle as an example and has a radius r, and the overlapped path length of adjacent dot patterns 215 is defined as d, wherein The diameter length is defined as the maximum length of overlapping radii of two adjacent dot patterns 215 . If the partial overlap of any two adjacent dot patterns 215 falls within the range of r/3<d<2r, then the light guide plate 210 can improve the overall light output efficiency of the light source module 200 to have a better performance; otherwise, if When the overlapping amount is less than r/3, the light extraction efficiency of the light source module 200 that the light guide plate 210 can improve is relatively small.

In this embodiment, except that the overlapping degree of the dot patterns 215 in the light reflection structures 213 will affect the light output efficiency of the light source module 200, the distance d1 between the light reflection structures 213 along the X-axis direction or the distance d1 along the Y axis The distance d2 in the axial direction will also affect the light output efficiency of the light source module 200 . For example, in FIG. 2A , the distance d2 between the light reflection structures 213 along the Y-axis direction gradually decreases as the direction away from the light source device 220 , so that the light that is farther away from the light source device 220 can be emitted Facet 212 can still provide sufficient brightness. In other words, if the light guide plate 210 adopts the distribution of the light reflection structure 213 as shown in FIG. 2A , the light source module 200 will have better overall light output efficiency and better light output uniformity.

In another embodiment, the arrangement of the light reflection structures 213 on the light guide plate 210 may also be as shown in FIG. 5 . In FIG. 5 , the distance d2 of each light reflection structure 213 along the X-axis direction may also be gradually reduced along the Y-axis direction, ie, away from the light source device 220 . Adopting the arrangement of the light reflective structures 213 as shown in FIG. 5 also enables the light source module 200 to have better overall light output efficiency and better light output uniformity.

In addition, in FIG. 2 and FIG. 5 , the number of dot patterns 215 of each light reflective structure 213 is the same, and the variation is only to change the distances d1 and d2 between each light reflective structure. In yet another embodiment, the number of dot patterns 215 in the light reflection structure 213 may also change along the direction away from the light source module, as shown in FIGS. 6 and 7 . In FIG. 6 , the number of dot patterns 215 in each light reflection structure 213 gradually increases along the direction away from the light source module 220 , and the distance d2 of each light reflection structure 213 along the Y-axis direction is along the direction away from the light source device 220 . The direction along the X-axis gradually decreases, while the distance d1 between the light reflection structures 213 along the X-axis direction gradually decreases along the direction away from the light source device 220 . FIG. 7 is similar to the arrangement of the light reflection structures 213 in FIG. 6 , the difference between them is that the distance d2 between the light reflection structures 213 in FIG. 7 along the Y-axis direction is fixed. Similarly, whether the light guide plate 210 in the light source module 200 adopts the arrangement of the light reflection structure 213 as shown in FIG. 6 or FIG. 7 , the light source module 200 can have better overall light output efficiency and better light output uniformity.

In this embodiment, the light reflective structure 213 on the light reflective surface 214 of the light guide plate 210 can not only adopt the design of dot pattern 215 as shown in FIG. 2A, FIG. 5 , FIG. 6 and FIG. The light reflective structure 213 shown in FIGS. 8A-8E is adopted, wherein the light-reflective structure 213 in FIGS. 8A-8E can be fabricated by the aforementioned laser ablation method, or a general laser process or etching process. The structure of the light reflection structure 213 in FIGS. 8A-8E will be described in detail below.

In FIG. 8A, each light reflective structure 213 can also include a plurality of internal patterns 219, wherein each internal pattern 219 is respectively located in the dot pattern 215, and the edge of each internal pattern 219 can be protruded or recessed in the light reflection. Surface 214. It should be noted that whether the inner pattern 219 protrudes or is recessed on the light reflecting surface 214 may depend on or use the aforementioned method of forming the dot pattern 215 . For example, if the dot pattern 215 is formed by using the above-mentioned method of stamping the steel plate, the internal pattern 219 can also be formed in the same way, or by using other laser or etching processes. In this embodiment, the aforementioned inner pattern 219 may be a circle, but it is not limited thereto.

In FIG. 8B, each light reflective structure 213 can also include a closed base pattern 218, wherein the base pattern 218 can be recessed or protruded from the light reflective surface 214, and covers the dot pattern 215 in the light reflective structure 213. The union area M1 of . Likewise, whether the base pattern 218 protrudes or is recessed on the light-reflecting surface 214 may depend on or use the aforementioned method of forming the dot pattern 215 , which will not be repeated here. In this embodiment, the pattern of the base pattern 218 may be a rectangle, but it is not limited thereto.

From another point of view, the protrusions 213b of each light reflection structure 213 in FIG. 8B may be formed by a plurality of dot patterns 215 located in the light active area 213a. For example, if the light-reflecting structure 213 of FIG. 8B is manufactured in the manner shown in FIG. 3A , each dot-like pattern 215 is a recess 215c located on the light-reflecting surface 214, and the edge of each dot-like pattern 215 215b protrudes from the light-reflecting surface 214; conversely, if the light-reflecting structure 213 of FIG. And the edge 215 b of each dot pattern 215 is recessed in the light reflecting surface 214 . In addition, if the design of the inner pattern 219 mentioned in FIG. 8A is added to the light reflection structure 213 in FIG. 8B , the light reflection structure 213 as shown in FIG. 8C can be formed.

In addition, the light reflective structure 213 in FIG. 8D is similar to the light reflective structure 213 in FIG. 8B , the difference between them is that any two dot patterns 215 in FIG. 8D are adjacent and tangent. The light reflection structure 213 in FIG. 8E is similar to the light reflection structure 213 in FIG. 8D , and the dot pattern 215 in FIG. 8E is arranged in an array. In the light source module 200, the light reflection structure 213 on the light guide plate 210 can have the advantages mentioned above in addition to the design of the dot pattern 215 as shown in FIG. 2A, FIG. 5, FIG. 6 and FIG. If the reflective structure 213 adopts the structures shown in FIGS. 8A-8E , it can also provide the overall light output efficiency of the light source module.

In this embodiment, the light source module 200 may also include an optical diffusion sheet 240 disposed on the light emitting surface 212 of the light guide plate 210 , so that the light provided by the light source module 200 can be further uniformed.

To sum up, the light source module of the present invention has at least the following advantages. First, the light guide plate has a plurality of light reflection structures on the light reflection surface, and each light reflection structure includes a closed light action area and a plurality of protrusions located in the light action area, so when the light is transmitted in the light guide plate to When the light reflection structure is located on the light reflection surface, the light will be reflected by the protrusions and exit the light guide plate through the light exit surface, thereby improving the light exit efficiency. From another point of view, since each light reflective structure includes more than two closed sub-patterns that intersect or tangent, and each sub-pattern can be recessed or protruded from the light-emitting surface, so the light is redirected by the light reflective structure. After the light guide plate is emitted through the light output surface, the overall light output efficiency of the light guide plate can be improved.

In addition, by designing the distance between the light reflection structures, the light output gain of the light guide plate can be further improved, and the light emitted from the light guide plate can be made more uniform. In addition, appropriately designing the number of dot patterns in each light reflection structure changes, for example, the direction away from the light source device gradually increases, which can also achieve the effect of increasing the light gain and uniforming the outgoing light.

Furthermore, the light reflection structure can also adopt other appropriate patterns to form a plurality of protrusions in the light action area, which can also help to improve the light extraction efficiency. In addition, the light source module can be provided with a reflection sheet on the light reflection surface, so as to transmit the light passing through the light reflection surface and out of the light guide plate back into the light guide plate, so as to improve the utilization rate of the light.

The above-mentioned content is only a preferred embodiment of the present invention, and should not limit the scope of the present invention with this, that is, all simple equivalent changes and modifications made according to the patent scope of the present invention and the description of the invention are all Still belong to the scope that the patent of the present invention covers. In addition, any embodiment or scope of claims of the present invention does not need to achieve all the objectives or advantages or features disclosed in the present invention. In addition, the abstract and the title are only used to assist in the search of patent documents, and are not used to limit the scope of rights of the present invention.

Claims (9)

1. A light source module, characterized in that the light source module comprises: A light guide plate, the light guide plate has a light exit surface, a light reflection surface opposite to the light exit surface, and at least one light incident surface connected between the light exit surface and the light reflection surface, and the The light guide plate has a plurality of light reflection structures on the light reflection surface, each light reflection structure includes a closed light action area and a plurality of protrusions located in the light action area, wherein the light action area and the light action area The light reflecting surfaces are not coplanar, and the protrusions extend toward the light guide plate; each light reflecting structure is composed of a plurality of dot patterns, and any two adjacent dot patterns partially overlap; and A light source device, set corresponding to the light incident surface, the light source device provides a light that enters the light guide plate from the light incident surface, and is redirected by one of the protrusions on the light reflection surface, and then The light guide plate is emitted from the light emitting surface. 2. The light source module according to claim 1, wherein each dot pattern is a depression on the light reflecting surface, and the edge of each dot pattern protrudes from the light reflecting surface, so The joint area of the dot-like patterns forms the photoactive area, and the edges of the intersection areas of the dot-like patterns form the protrusions. 3. The light source module according to claim 1, wherein each dot pattern is a protrusion on the light reflecting surface, and the edge of each dot pattern is depressed on the light reflecting surface, so The joint area of the dot pattern forms the photoactive area, and the edge of the intersection area of the dot pattern forms a plurality of grooves separating the protrusions. 4. The light source module according to claim 1, wherein the dot patterns constituting each light reflection structure are arranged along a straight line, and the extending direction of the straight line is substantially perpendicular to the traveling direction of the light rays . 5. The light source module according to claim 1, wherein the dot pattern is circular. 6. The light source module according to claim 1, wherein each light reflective structure further comprises a plurality of internal patterns respectively located in the dot-like patterns, and the edge of each internal pattern protrudes or is recessed in the said dot pattern. light reflective surface. 7. The light source module according to claim 6, wherein the inner pattern is circular. 8 . The light source module according to claim 1 , wherein the number of the dot patterns in each light reflection structure gradually increases along a direction away from the light source device. 9 . The light source module according to claim 8 , wherein the distance between any two adjacent light reflection structures gradually decreases along the direction away from the light source device.

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