TWI453507B - Light source module - Google Patents

Description

Light source module

The present invention relates to an optical module, and more particularly to a light source module.

The conventional flat light source module can be used as a backlight module of a liquid crystal display, as a backlight of a liquid crystal display panel that does not emit light by itself or as a surface light source directly used as a light fixture. The flat light source module can be divided into a direct light source module and a side input light source module. The conventional side-entry light source module includes a light-emitting element, a light guide plate, a reflection sheet, a lower diffusion sheet, two cymbals in which the 稜鏡 extension direction is orthogonal, and an upper diffusion sheet. The light emitted by the light-emitting element enters the light guide plate through the light-incident surface of the light guide plate, and is then emitted outside the light guide plate by the scattering microstructure at the bottom of the light guide plate. The reflective sheet reflects the light back to the light guide plate and transmits it to the lower diffusion sheet via the light guide plate. The lower diffusion sheet and the upper diffusion sheet can diffuse light to enhance the uniformity of the surface light source provided by the light source module. On the other hand, the cymbal can reduce the divergence angle of the light to enhance the brightness that the light source module can provide.

In the prior art, the lower diffusion sheet, the two dies and the upper diffusion sheet are sequentially stacked on the light guide plate, and the reflection sheet is disposed on the other side of the light guide plate. In this way, five optical films are stacked in the thickness direction of the side-entry light source module, so that the thickness of the side-entry light source module is difficult to be reduced.

Further, in order to make the thickness of the side-entry light source module thin, the conventional technique is to reduce the thickness of the optical film. However, when the thickness of the optical film is thinned, the mechanical properties thereof are also weakened, resulting in an unevenness of the optical film. For example, when the diffusion sheet is disposed on the cymbal of the cymbal, the weakened mechanical properties will cause partial regions of the diffusion sheet to contact the cymbal, while other regions will not maintain an optical gap with the cymbal. The flat phenomenon causes the phenomenon of different transmitted light in different regions, and the brightness of the surface light source provided by the side-in type light source module is not uniform.

On the other hand, when the optical film is partially electrostatically charged, it will cause local sticking of the optical film, and the phenomenon that the optical film is uneven will be deteriorated.

Four types of light guide plates are disclosed in U.S. Patent No. 7,046,905, the Republic of China Patent No. M358989, the Republic of China Patent No. M311911, and the Republic of China Patent No. M321111, respectively. In addition, two types of optical films are disclosed in U.S. Patent No. 5,771,328 and U.S. Patent No. 1,346,798, respectively.

The invention provides a light source module. The structure of the light source module helps to reduce the number of optical films used by the light source module, and helps to reduce the adhesion of the optical film and the local area of the light guide plate.

Other objects and advantages of the present invention will become apparent from the technical features disclosed herein.

In order to achieve one or a part or all of the above or other purposes, an embodiment of the present invention provides a light source module including a light guide plate, at least one light emitting element, and a reflective element. The light guide plate includes a first surface, a second surface, a light incident surface, a plurality of first strip-shaped optical structures, and a plurality of second strip-shaped optical structures. The second surface is opposite to the first surface, and the light incident surface connects the first surface and the second surface. The first strip-shaped optical structures are disposed on the first surface, and the second strip-shaped optical structures are disposed on the first surface. Between the two adjacent first strip-shaped optical structures, at least one second strip-shaped optical structure is disposed, and a height of each of the first strip-shaped optical structures in a direction perpendicular to the second surface is not equal to each second strip The height of the optical structure in a direction perpendicular to the second surface. The light emitting element is disposed beside the light incident surface, and the reflective element is disposed on one side of the second surface, wherein the second surface is located between the reflective element and the first surface.

In a light source module according to an embodiment of the present invention, N second strip-shaped optical structures are disposed between two adjacent first strip-shaped optical structures, 3≦N≦6, and N is a positive integer.

A light source module according to an embodiment of the present invention, wherein a height of each of the first strip-shaped optical structures in a direction perpendicular to the second surface is greater than a direction of each of the second strip-shaped optical structures in a direction perpendicular to the second surface height.

In a light source module according to an embodiment of the present invention, each of the first strip-shaped optical structures has a triangular column shape, and each of the second strip-shaped optical structures has a triangular column shape.

A light source module according to an embodiment of the present invention, wherein each of the first strip-shaped optical structures has a first apex angle pointing away from the second surface, and each of the second strip-shaped optical structures has a pointing away from the second surface The second corner of the direction.

A light source module according to an embodiment of the present invention, wherein each of the first strip-shaped optical structures has a first apex angle pointing away from the second surface, and each of the second strip-shaped optical structures has a pointing away from the second surface The second apex angle of the direction, the first apex angle is a rounded corner, and the second apex angle is a rounded corner.

In a light source module according to an embodiment of the present invention, each of the first strip-shaped optical structures has a cylindrical surface, and each of the second strip-shaped optical structures has a cylindrical surface.

A light source module according to an embodiment of the present invention, wherein at least one second strip-shaped optical structure is disposed between adjacent two first strip-shaped optical structures arranged along the first direction, and arranged along the second direction At least one second strip-shaped optical structure is disposed between the adjacent two first strip-shaped optical structures.

A light source module according to an embodiment of the present invention, wherein each of the first strip-shaped optical structures has a first end surface that is inclined with respect to the second surface, and a second end surface that is inclined with respect to the first end surface and opposite to the second surface a first strip surface connecting the first end surface and the second end surface and inclined with respect to the second surface; and a second strip surface portion connecting the first end surface and the second end surface and inclined with respect to the second surface The oblique direction of the first strip surface is different from the tilt direction of the second strip surface, and each second strip optical structure has: a third end surface inclined with respect to the second surface; and a fourth end surface opposite to a third end surface inclined with respect to the second surface; a third strip-shaped prism surface connecting the third end surface and the fourth end surface and inclined with respect to the second surface; and a fourth strip-shaped prism surface connecting the third end surface and the third end surface The four end faces are inclined with respect to the second surface, wherein the oblique direction of the third strip-shaped facet is different from the inclined direction of the fourth strip-shaped facet.

In a light source module according to an embodiment of the present invention, the extending direction of each of the first strip-shaped optical structures is substantially parallel to the extending direction of each of the second strip-shaped optical structures.

A light source module according to an embodiment of the present invention, wherein the first direction is not equal to the second direction.

A light source module according to an embodiment of the present invention, wherein a height of each of the first strip-shaped optical structures in a direction perpendicular to the second surface is greater than a direction of each of the second strip-shaped optical structures in a direction perpendicular to the second surface height.

In a light source module according to an embodiment of the present invention, each of the first strip-shaped optical structures extends from a side close to the light incident surface to a side away from the light incident surface, and each second strip optical structure is close to One side of the smooth surface extends toward the side far from the light incident surface.

The light source module of an embodiment of the present invention further includes at least one optical film disposed on the first surface.

In a light source module according to an embodiment of the present invention, at least one of the optical films is a gusset, a diffusion sheet or a combination thereof.

In the light source module of the embodiment of the present invention, at least one second strip-shaped optical structure is disposed between two adjacent first strip-shaped optical structures, and each of the first strip-shaped optical structures is perpendicular to the second surface. The height in the direction is not equal to the height of each second strip-shaped optical structure in a direction perpendicular to the second surface, so that when the optical film is disposed above the first surface of the light guide plate, the height can be higher The strip optical structure is in contact with the optical film. In this way, the contact area between the light guide plate and the optical film can be reduced to reduce the adhesion of the light guide plate and the local area of the optical film, thereby improving the uniformity of the surface light source provided by the light source module. In addition, since the first strip-shaped optical structure and the second strip-shaped optical structure are integrated on the first surface of the light guide plate, the light source module of the embodiment of the invention helps to reduce the optical film used by the light source module. The number, in turn, can effectively reduce the overall thickness of the light source module.

The above described features and advantages of the present invention will be more apparent from the following description.

The above and other technical contents, features and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments. The directional terms mentioned in the following embodiments, such as up, down, left, right, front or back, etc., are only directions referring to the additional drawings. Therefore, the directional terminology used is for the purpose of illustration and not limitation.

1A is a perspective view of a light source module according to an embodiment of the present invention, FIG. 1B is a partial cross-sectional view of the light source module of FIG. 1A along line II, and FIG. 1C is a light source module of FIG. 1A along II-II A schematic view of a partial section of the line. Referring to FIG. 1A to FIG. 1C , the light source module 100 of the present embodiment includes a light guide plate 110 and at least one light emitting element 120 (in FIG. 1A , a plurality of light emitting elements 120 are taken as an example, but the invention is not limited thereto). And a reflective element 130. The light guide plate 110 includes a first surface 112, a second surface 114, a light incident surface 116, a plurality of first strip-shaped optical structures 140, and a plurality of second strip-shaped optical structures 150. The second surface 114 is opposite to the first surface 112, and the light incident surface 116 connects the first surface 112 and the second surface 114. The first strip-shaped optical structures 140 are disposed on the first surface 112 , and the second strip-shaped optical structures 150 are disposed on the first surface 112 . At least one second strip-shaped optical structure 150 is disposed between two adjacent first strip-shaped optical structures 140 (in FIG. 1A, three second strip-shaped optical structures 150 are taken as an example, but the invention is not limited thereto) And the height H1 of each of the first strip-shaped optical structures 140 in a direction perpendicular to the second surface 114 is not equal to the height H2 of each of the second strip-shaped optical structures 150 in a direction perpendicular to the second surface 114. In the present embodiment, the height H1 is greater than the height H2, but the invention is not limited thereto.

The light emitting element 120 is disposed beside the light incident surface 116. In the present embodiment, the light-emitting element 120 is, for example, a light-emitting diode (LED), which is arranged, for example, along a first direction D1 substantially parallel to the light-incident surface 116. However, in another embodiment, a cold cathode fluorescent lamp may be used instead of the light emitting diodes, wherein the cold cathode fluorescent lamp extends, for example, along the first direction D1. Alternatively, in other embodiments, other suitable light-emitting elements may be used in place of these light-emitting diodes.

The reflective element 130 is disposed on one side of the second surface 114 with the second surface 114 between the reflective element 130 and the first surface 112. In the present embodiment, the reflective element 130 is, for example, a reflective sheet.

In this embodiment, the illuminating element 120 is adapted to emit an illumination light 122. After entering the light guide plate 110 via the light incident surface 116, the illumination light 122 is continuously reflected by the first surface 112 and the second surface 114 to be limited. In the light guide plate 110. However, the optical microstructures 115 on the second surface 114 can destroy total reflection and scatter some of the illumination light 122 to the first surface 112 and through the first surface 112. In addition, the optical microstructures 115 scatter another portion of the illumination light 122 to the reflective element 130 (not shown), while the reflective element 130 reflects the illumination light 122 back to the light guide plate 110 and causes the illumination light 122 to sequentially penetrate the second surface 114. And the first surface 112. In the present embodiment, optical microstructures 115 are, for example, dots, bumps, pits, ridges, indentations, suitable geometric protrusions, suitable geometric depressions, scattering materials, or combinations thereof.

In this embodiment, each of the first strip-shaped optical structures 140 has a triangular column shape, and each of the second strip-shaped optical structures 150 has a triangular column shape. In addition, in this embodiment, each of the first strip-shaped optical structures 140 extends from a side close to the light-incident surface 116 to a side away from the light-incident surface 116, and each of the second strip-shaped optical structures 150 is close to One side of the smooth surface 116 extends toward a side away from the light incident surface 116. Specifically, in the embodiment, the first strip-shaped optical structures 140 and the second strip-shaped optical structures 150 are arranged along the first direction D1, and each of the first strip-shaped optical structures 140 is along the second direction D2. Extending, and each of the second strip-shaped optical structures 150 extends along the second direction D2, wherein the first direction D1 is, for example, substantially parallel to the light incident surface 116 and the second surface 114, and the second direction is, for example, substantially perpendicular to the first One direction D1 is substantially perpendicular to the light incident surface 116. The first strip-shaped optical structure 140 and the second strip-shaped optical structure 150 can achieve the effect of converging the divergence angle of the illumination light 122.

In this embodiment, the light source module 100 further includes at least one optical film (for example, an optical film 160 and an optical film 170 in FIGS. 1A to 1C ) disposed on the first surface 112 . In particular, the at least one optical film is, for example, a crepe sheet, a diffusion sheet or a combination thereof. For example, in the present embodiment, the optical film 160 is, for example, a cymbal, and the optical film 170 is, for example, a diffusion sheet. Further, in the present embodiment, the plurality of masts 162 of the optical film 160 are aligned, for example, along the second direction D2, and each of the masts 162 extends along the first direction D1. However, in another embodiment, the light source module 100 can also use the optical film 160, but does not use the optical film 170. Alternatively, the light source module 100 may also use the optical film 170, but the optical film 160 is not used. In the present embodiment, the optical film 160 is disposed between the first surface 112 and the optical film 170.

In the light source module 100 of the present embodiment, at least one second strip-shaped optical structure 150 is disposed between two adjacent first strip-shaped optical structures 140, and each of the first strip-shaped optical structures 140 is perpendicular to the first The height H1 in the direction of the two surfaces 114 is not equal to the height H2 of each second strip-shaped optical structure 150 in the direction perpendicular to the second surface 114, and thus the optical film is disposed above the first surface 112 of the light guide plate 110. (For example, the optical film 160, 170), the optical film can be formed by a strip optical structure (such as the first strip optical structure 140) having a higher height (in this embodiment, the optical film 160 is used) Example) Contact. In this way, since the optical film 160 is held by the first strip optical structure 140 having a higher height to maintain a gap with the second strip optical structure 150, the contact area between the light guide plate 110 and the optical film 160 can be reduced. The phenomenon that the light guide plate 110 and the optical film 160 are adhered to each other is reduced, thereby improving the uniformity of the surface light source provided by the light source module 100.

In addition, since the first strip-shaped optical structure 140 and the second strip-shaped optical structure 150 are integrated on the first surface 112 of the light guide plate 110, the light source module 100 of the embodiment helps reduce the use of the light source module 100. The number of optical films, in turn, can effectively reduce the overall thickness of the light source module 100.

In the present embodiment, each of the first strip-shaped optical structures 140 has a first apex angle 142 pointing away from the second surface 114, and each of the second strip-shaped optical structures 150 has a direction away from the second surface 114. The second apex angle 152 of the direction, wherein the first apex angle 142 can be a rounded corner or a sharp corner, and the second apex angle 152 can be a rounded corner or a sharp corner (the first apex angle 142 and the second apex angle 152 are illustrated It is a rounded corner, but the invention is not limited thereto, and the first apex angle 142 and the second apex angle 152 may be one of a rounded corner and a sharp corner, respectively. The rounded corners allow the illumination light 122 to diffuse, thereby increasing the uniformity of the surface source. In addition, the rounded corners can also reduce the degree of wear of the first strip-shaped optical structure 140 and the optical strip 160 due to mutual contact with each other.

In this embodiment, the thickness of the optical film 160 is less than or equal to 0.215 mm, and N second strip-shaped optical structures 150 are disposed between adjacent two first strip-shaped optical structures 140, wherein 3≦N≦6, and N Is a positive integer. When the N value falls within the above range, the number of the first strip-shaped optical structures 140 is not excessive, and thus the first strip-shaped optical structure 140 can reduce the contact area of the light guide plate 110 and the optical film 160, and reduce the optical film 160. The opportunity to partially adhere to the light guide plate 110 further enhances the uniformity of the surface light source provided by the light source module 100. On the other hand, when the value of N falls within the above range, the number of the first strip-shaped optical structures 140 is not too small, so that the optical film 160 can be relatively flatly held by the first strip-shaped optical structure 140, and less The optical film 160 may be warped to contact the second strip-shaped optical structure 150 because the number of the first strip-shaped optical structures 140 is too small and the gap is too large. In this way, the chance of the optical film 160 being partially adhered to the light guide plate 110 can be effectively reduced.

2 is a partial cross-sectional view showing a light source module according to another embodiment of the present invention. Referring to FIG. 2, the light source module 100a of the present embodiment is similar to the light source module 100 of FIG. 1B, and the difference between the two is as follows. In the light source module 100a of the present embodiment, the first strip-shaped optical structure 140a of the light guide plate 110a has a cylindrical surface 144a, and the second strip-shaped optical structure 150a of the light guide plate 110a has a cylindrical surface 154a. For example, the first strip-shaped optical structure 140a and the second strip-shaped optical structure 150a are each, for example, a semi-cylindrical or a part of a cylinder. Such a first strip-shaped optical structure 140a and a second strip-shaped optical structure 150a can increase the degree of diffusion of the illumination light 122, thereby improving the uniformity of the surface light source. The invention is not limited thereto, and the first strip-shaped optical structure 140a and the second strip-shaped optical structure 150a may be one of a semi-cylindrical shape and a triangular column shape, respectively.

3 is a partial cross-sectional view showing a light source module according to still another embodiment of the present invention. Referring to FIG. 3, the light source module 100b of the present embodiment is similar to the light source module 100a of FIG. 1B, and the difference between the two is as follows. In the light source module 100b of the embodiment, the first top corner 142b of the first strip-shaped optical structure 140b of the light guide plate 110b is a sharp corner, and the second top corner 152b of the second strip-shaped optical structure 150b of the light guide plate 110b It is a sharp corner, but the invention is not limited thereto, and the first corner angle 142b and the second corner angle 152b may be one of rounded corners and sharp corners, respectively.

4 is a partial perspective view of a light guide plate 110c in a light source module according to still another embodiment of the present invention, and FIGS. 5A to 5D respectively illustrate the first strip-shaped optical structure 140c of FIG. 4 viewed from different directions. schematic diagram. Referring to FIG. 4 and FIG. 5A to FIG. 5D , the light source module of the embodiment is similar to the light source module 100 of FIGS. 1A to 1C , and the difference between the two is the light guide plate. The light guide plate 110c of the present embodiment is similar to the light guide plate 110 of FIGS. 1A to 1C, and the difference between the two is as follows. In the light guide plate 110c of the embodiment, at least one second strip-shaped optical structure 150c is disposed between adjacent two first strip-shaped optical structures 140c arranged along the first direction D1 (in FIG. 4 is a first The two strip-shaped optical structures 150c are exemplified, but in other embodiments may be plural, and at least one second is disposed between adjacent two first strip-shaped optical structures 140c arranged along the second direction D2. The strip-shaped optical structure 150c (in FIG. 4, a second strip-shaped optical structure 150c is taken as an example, but in other embodiments, it may be plural). The viewing direction of the first strip-shaped optical structure 140c in FIGS. 5A to 5D may refer to the directions indicated by the first direction D1 and the second direction D2 in the drawing, and the second strip-shaped optical structure 150c is similar to FIG. 5A to FIG. 5D. The first strip-shaped optical structure 140c is shown, but the height of the first strip-shaped optical structure 140c is different from the height of the second strip-shaped optical structure 150c.

In this embodiment, each of the first strip-shaped optical structures 140c has a first end surface 141c, a second end surface 143c, a first strip-shaped prism surface 145c, and a second strip-shaped prism surface 147c. The first end surface 141c is inclined with respect to the second surface 114. The second end surface 143c is inclined with respect to the first end surface 141c with respect to the second surface 114. The first one-sided facet 145c connects the first end face 141c and the second end face 143c, and is inclined with respect to the second surface 114. The second strip surface 147c connects the first end surface 141c and the second end surface 143c and is inclined with respect to the second surface 114, wherein the oblique direction of the first strip surface 145c is different from the tilt direction of the second strip surface 147c . In the present embodiment, the inclination direction of the first end surface 141c is different from the inclination direction of the second end surface 143c. In addition, similar to the first strip-shaped optical structure 140c, each of the second strip-shaped optical structures 150c has a third end surface 151c, a fourth end surface 153c, a third strip-shaped prism surface 155c, and a fourth strip-shaped prism surface 157c. . The third end surface 151c is inclined with respect to the second surface 114. The fourth end surface 153c is inclined with respect to the third end surface 151c with respect to the second surface 114. The third strip surface 155c connects the third end surface 151c and the fourth end surface 153c and is inclined with respect to the second surface 114. The fourth strip surface 157c connects the third end surface 151c and the fourth end surface 153c and is inclined with respect to the second surface 114, wherein the oblique direction of the third strip surface 155c is different from the tilt direction of the fourth strip surface 157c . In the present embodiment, the inclination direction of the third end surface 151c is different from the inclination direction of the fourth end surface 153c.

In this embodiment, the extending direction of each of the first strip-shaped optical structures 140c is substantially parallel to the extending direction of each of the second strip-shaped optical structures 150c. Moreover, the height of each of the first strip-shaped optical structures 140c in a direction perpendicular to the second surface 114 is greater than the height of each of the second strip-shaped optical structures 150c in a direction perpendicular to the second surface 114.

In this embodiment, since the second strip-shaped optical structure 150c is interposed between the first strip-shaped optical structures 140c in the first direction D1 and the second direction D2, the optical film above the light guide plate 110c is The position supported by the strip-shaped optical structure 140c can be more evenly dispersed to improve the flatness of the optical film, thereby improving the uniformity of the surface light source provided by the light source module.

In other embodiments, M second strip-shaped optical structures 150c are disposed between adjacent two first strip-shaped optical structures 140c arranged along the first direction D1, and the phases are arranged along the second direction D2. N second strip-shaped optical structures 150c are disposed between the adjacent first strip-shaped optical structures 140c, wherein 3≦M≦6, 3≦N≦6, and M and N are positive integers.

The light source module of the above embodiment can be used as a backlight module of a liquid crystal display, or as an indoor or outdoor lighting fixture, depending on the needs of use.

In summary, in the light source module of the embodiment of the present invention, at least one second strip-shaped optical structure is disposed between two adjacent first strip-shaped optical structures, and each of the first strip-shaped optical structures is The height in a direction perpendicular to the second surface is not equal to the height of each second strip-shaped optical structure in a direction perpendicular to the second surface, so when an optical film is disposed above the first surface of the light guide plate, The optical film is contacted by a highly high strip optical structure. In this way, the contact area between the light guide plate and the optical film can be reduced to reduce the adhesion of the light guide plate and the local area of the optical film, thereby improving the uniformity of the surface light source provided by the light source module. In addition, since the first strip-shaped optical structure and the second strip-shaped optical structure are integrated on the first surface of the light guide plate, the light source module of the embodiment of the invention helps to reduce the optical film used by the light source module. The number, in turn, can effectively reduce the overall thickness of the light source module.

The above is only the preferred embodiment of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention are All remain within the scope of the invention patent. In addition, any of the objects or advantages or features of the present invention are not required to be achieved by any embodiment or application of the invention. In addition, the abstract sections and headings are only used to assist in the search of patent documents and are not intended to limit the scope of the invention. The terms "first", "second", and the like, which are used in the specification or the claims, are used to refer to the names of the elements or to distinguish different embodiments or ranges, and are not intended to limit the upper or lower limit of the number of elements.

100, 100a, 100b. . . Light source module

110, 110a, 110b, 110c. . . Light guide

112. . . First surface

114. . . Second surface

115. . . Optical microstructure

116. . . Glossy surface

120. . . Light-emitting element

122. . . Illumination light

130. . . Reflective element

140, 140a, 140b, 140c. . . First strip optical structure

141c. . . First end face

142, 142b. . . First corner

143c. . . Second end face

144a, 154a. . . Cylindrical surface

145c. . . First lobe

147c. . . Second strip facet

150, 150a, 150b, 150c. . . Second strip optical structure

151c. . . Third end

152, 152b. . . Second top angle

153c. . . Fourth end

155c. . . Third strip facet

157c. . . Fourth strip facet

160, 170. . . Optical diaphragm

D1. . . First direction

D2. . . Second direction

H1. . . height

H2. . . height

1A is a perspective view of a light source module according to an embodiment of the present invention.

1B is a partial cross-sectional view of the light source module of FIG. 1A taken along line I-I.

1C is a partial cross-sectional view of the light source module of FIG. 1A taken along line II-II.

2 is a partial cross-sectional view showing a light source module according to another embodiment of the present invention.

3 is a partial cross-sectional view showing a light source module according to still another embodiment of the present invention.

4 is a partial perspective view of a light guide plate in a light source module according to still another embodiment of the present invention.

5A to 5D are schematic views respectively showing the first strip-shaped optical structure of FIG. 4 as seen from different directions.

100. . . Light source module

110. . . Light guide

112. . . First surface

114. . . Second surface

116. . . Glossy surface

120. . . Light-emitting element

130. . . Reflective element

140. . . First strip optical structure

150. . . Second strip optical structure

160, 170. . . Optical diaphragm

D1. . . First direction

D2. . . Second direction

Claims (15)

A light source module includes: a light guide plate comprising: a first surface; a second surface opposite to the first surface; a light incident surface connecting the first surface and the second surface; a strip-shaped optical structure disposed on the first surface; and a plurality of second strip-shaped optical structures disposed on the first surface, wherein at least one of the adjacent two first optical structures is disposed a two-line optical structure, and a height of each of the first strip-shaped optical structures in a direction perpendicular to the second surface is not equal to a direction of each of the second strip-shaped optical structures in a direction perpendicular to the second surface a height; at least one light emitting element disposed adjacent to the light incident surface; and a reflective element disposed on one side of the second surface, wherein the second surface is located between the reflective element and the first surface. The light source module of claim 1, wherein N the second strip-shaped optical structures are disposed between two adjacent first strip-shaped optical structures, 3≦N≦6, and N is a positive integer. . The light source module of claim 1, wherein a height of each of the first strip-shaped optical structures in a direction perpendicular to the second surface is greater than each of the second strip-shaped optical structures is perpendicular to the The height in the direction of the second surface. The light source module of claim 1, wherein each of the first strip-shaped optical structures has a triangular column shape, and each of the second strip-shaped optical structures has a triangular column shape. The light source module of claim 4, wherein each of the first strip-shaped optical structures has a first apex angle pointing away from the second surface, and each of the second strip-shaped optical structures has A second vertex pointing in a direction away from the second surface. The light source module of claim 4, wherein each of the first strip-shaped optical structures has a first apex angle pointing away from the second surface, and each of the second strip-shaped optical structures has a second apex angle pointing away from the second surface, the first apex angle being rounded, and the second apex angle being rounded. The light source module of claim 1, wherein each of the first strip-shaped optical structures has a cylindrical surface, and each of the second strip-shaped optical structures has a cylindrical surface. The light source module of claim 1, wherein at least one of the second strip-shaped optical structures is disposed between adjacent ones of the first strip-shaped optical structures arranged along a first direction, and along At least one of the second strip-shaped optical structures is disposed between adjacent ones of the first strip-shaped optical structures arranged in a second direction. The light source module of claim 8, wherein each of the first strip-shaped optical structures has: a first end surface inclined relative to the second surface; and a second end surface opposite to the first end surface And inclined with respect to the second surface; a first strip-shaped facet connecting the first end face and the second end face and inclined with respect to the second surface; and a second strip-shaped facet connecting the first An end surface and the second end surface are inclined with respect to the second surface, wherein an oblique direction of the first strip-shaped facet is different from an oblique direction of the second strip-shaped facet, and each of the second strip-shaped optics The structure has: a third end surface inclined with respect to the second surface; a fourth end surface opposite to the third end surface and inclined with respect to the second surface; a third strip-shaped face surface connecting the third end surface And the fourth end surface, and inclined with respect to the second surface; and a fourth strip-shaped prism surface connecting the third end surface and the fourth end surface, and inclined with respect to the second surface, wherein the third strip shape The inclination direction of the facet is different from the inclination of the fourth strip facet direction. The light source module of claim 8, wherein an extension direction of each of the first strip-shaped optical structures is substantially parallel to an extending direction of each of the second strip-shaped optical structures. The light source module of claim 8, wherein the first direction is not equal to the second direction. The light source module of claim 8, wherein a height of each of the first strip-shaped optical structures in a direction perpendicular to the second surface is greater than each of the second strip-shaped optical structures is perpendicular to the The height in the direction of the second surface. The light source module of claim 1, wherein each of the first strip-shaped optical structures extends from a side close to the light incident surface to a side away from the light incident surface, and each of the second The strip-shaped optical structure extends from a side close to the light incident surface to a side away from the light incident surface. The light source module of claim 1, further comprising at least one optical film disposed on the first surface. The light source module of claim 14, wherein the at least one optical film is a gusset, a diffusion sheet or a combination thereof.