TWI559040B - Light guide plate and light source module - Google Patents

Description

Light guide plate and light source module

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

The light source module is mainly divided into a direct light source module and a side light source light source module according to different positions of the light source. For example, the side-input light source module generally includes a light guide plate and a light source disposed on a side of the light guide plate. After the light beam from the light source enters the light guide plate, the light beam is confined in the light guide plate due to total reflection. By forming a plurality of microstructures on the bottom surface of the light guide plate to destroy total reflection, the light beam can be smoothly emitted from the light exit surface of the light guide plate.

In the prior art, the improvement of the microstructure (such as position or shape) mainly focuses on the improvement of the light uniformity of the light source module, and the light utilization efficiency of the light source module is rarely optimized. With the rise of awareness of energy conservation and environmental protection and the increasing demand for high-luminance light source modules in the market, how to improve the light utilization efficiency of the light source module to effectively improve the optical efficiency of the light source module has become a problem that current R&D personnel are trying to solve. one.

The "prior art" paragraphs are only intended to aid in understanding the present invention, and thus the disclosure of the "prior art" section may contain prior art that is not known to those of ordinary skill in the art. The content disclosed in the "Prior Art" section does not represent the content or the problem to be solved by one or more embodiments of the present invention, nor does it mean that it is known to those of ordinary skill in the art or prior to the present application. Cognition.

The present invention provides a light guide plate capable of effectively controlling the directivity of a light beam.

The invention provides a light source module which has good light utilization efficiency and brightness.

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 guide plate including a first light incident surface, a light exit surface, and a bottom surface. The bottom surface is opposite to the light exit surface. The first light incident surface connects the bottom surface and the light exit surface. A plurality of first strip-shaped grooves are formed on the bottom surface. The arrangement direction of the first groove is perpendicular to the first light incident surface. The width of the first groove in the arrangement direction increases as the distance between the first strip groove and the first light incident surface increases, and the depth of the first strip groove follows the first strip groove The distance from the first light incident surface increases and increases. Each of the first strip-shaped grooves has a first light-incident surface and a first backlight surface that is connected to the first light-incident surface. The first light-incident surface is located between the first light-incident surface and the first backlight surface. Each of the first light-incident surfaces includes a plurality of first planes, and the first planes are spaced apart along the extending direction of each of the first strip-shaped grooves.

In an embodiment of the invention, the inner angle of the first front surface and the bottom surface is greater than the inner angle of the first backlight surface and the bottom surface.

In an embodiment of the invention, the light guide plate further includes a plurality of first columnar structures. The first columnar structure protrudes from the bottom surface, wherein each of the first strip-shaped trenches and the first columnar structure has a plurality of staggered portions, and the first plane of each of the first strip-shaped trenches and the first columnar structure are along The extending direction of the first groove is alternately arranged.

In an embodiment of the invention, the light guide plate further includes a plurality of microstructures. The microstructure is located in the first strip-shaped trench and is connected to the corresponding first light-incident surface and the corresponding first backlight surface, wherein the first plane and the microstructure of each first strip-shaped trench are along each first strip-shaped trench The direction of extension is alternately set.

In an embodiment of the invention, each of the microstructures has a circular arc shape on a reference plane parallel to the first light incident surface, and a maximum thickness of each microstructure is equal to a corresponding first strip groove. The maximum depth.

In an embodiment of the invention, the curvatures of the microstructures located in the different first strip-shaped trenches are the same, and the widths of the microstructures in the arrangement direction and the extension direction are corresponding to the corresponding first strip-shaped trenches. The distance of the first light incident surface increases as the distance increases.

In an embodiment of the invention, the curvature of the microstructure increases as the distance between the first strip-shaped trench and the first light-incident surface increases. The width of the microstructure in the alignment direction increases as the distance between the corresponding first strip-shaped trench and the first light-incident surface increases, and the width of the microstructure in the extending direction increases with the corresponding first strip-shaped trench The distance from the first light incident surface decreases and decreases.

In an embodiment of the invention, the microstructures in the at least one first strip-shaped trench are connected.

In an embodiment of the invention, the light guide plate further includes a second light incident surface. The second light incident surface is opposite to the first light incident surface and connects the bottom surface and the light exit surface. The bottom surface is further formed with a plurality of second strip-shaped grooves. The second strip-shaped groove is parallel to the first strip-shaped groove. The width of the second strip-shaped groove in the arrangement direction increases as the distance between the second strip-shaped groove and the second light-incident surface increases, and the depth of the second strip-shaped groove follows the second strip-shaped groove The distance from the second light incident surface increases as the distance increases. Each of the second strip-shaped grooves has a second light-incident surface and a second backlight surface that is connected to the second light-incident surface. The second light-incident surface is located between the second light-incident surface and the second backlight surface, wherein each of the second light-incident surfaces includes a plurality of second planes, and the second planes are spaced apart along the extending direction.

In an embodiment of the invention, the first light incident surface is located at a corner of the light guide plate, and the orthographic projection shape of each of the first strip grooves on the bottom surface is meandered.

In an embodiment of the invention, the light guide plate further includes a plurality of second columnar structures. The second columnar structure protrudes from the light emitting surface, and the extending direction of the second columnar structure is perpendicular to the first light incident surface.

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, a first light source, and a first cymbal. The light guide plate includes a first light incident surface, a light exit surface, and a bottom surface. The bottom surface is opposite to the light exit surface. The first light incident surface connects the bottom surface and the light exit surface. A plurality of first strip-shaped grooves are formed on the bottom surface. The arrangement direction of the first groove is perpendicular to the first light incident surface. The width of the first groove in the arrangement direction increases as the distance between the first strip groove and the first light incident surface increases, and the depth of the first strip groove follows the first strip groove The distance from the first light incident surface increases and increases. Each of the first strip-shaped grooves has a first light-incident surface and a first backlight surface that is connected to the first light-incident surface. The first light-incident surface is located between the first light-incident surface and the first backlight surface. Each of the first light-incident surfaces includes a plurality of first planes, and the first planes are spaced apart along the extending direction of each of the first strip-shaped grooves. The first light source is located beside the first light incident surface. The first cymbal is located above the illuminating surface and has a plurality of first masts, wherein the first masts are arranged in the arrangement direction.

In an embodiment of the invention, the inner angle of the first front surface and the bottom surface is greater than the inner angle of the first backlight surface and the bottom surface.

In an embodiment of the invention, the light source module further includes a second cymbal. The second cymbal is located between the first cymbal and the light exiting surface. The second cymbal has a plurality of second masts and the second mast is perpendicular to the first mast.

In an embodiment of the invention, the light guide plate further includes a plurality of first columnar structures. The first columnar structure protrudes from the bottom surface, wherein each of the first strip-shaped trenches and the first columnar structure has a plurality of staggered portions, and the first plane of each of the first strip-shaped trenches and the first columnar structure are along The extending direction of the first groove is alternately arranged.

In an embodiment of the invention, the light guide plate further includes a plurality of microstructures. The microstructure is located in the first strip-shaped trench and is connected to the corresponding first light-incident surface and the corresponding first backlight surface, wherein the first plane and the microstructure of each first strip-shaped trench are along each first strip-shaped trench The direction of extension is alternately set.

In an embodiment of the invention, each of the microstructures has a circular arc shape on a reference plane parallel to the first light incident surface, and a maximum thickness of each microstructure is equal to a corresponding first strip groove. The maximum depth.

In an embodiment of the invention, the light guide plate further includes a second light incident surface. The second light incident surface is opposite to the first light incident surface and connects the bottom surface and the light exit surface. The bottom surface is further formed with a plurality of second strip-shaped grooves. The second strip-shaped groove is parallel to the first strip-shaped groove. The width of the second strip-shaped groove in the arrangement direction increases as the distance between the second strip-shaped groove and the second light-incident surface increases, and the depth of the second strip-shaped groove follows the second strip-shaped groove The distance from the second light incident surface increases as the distance increases. Each of the second strip-shaped grooves has a second light-incident surface and a second backlight surface that is connected to the second light-incident surface. The second light-incident surface is located between the second light-incident surface and the second backlight surface, wherein each of the second light-incident surfaces includes a plurality of second planes, and the second planes are spaced apart along the extending direction. The light source module further includes a second light source. The second light source is located beside the second light incident surface.

In an embodiment of the invention, the light guide plate further includes a plurality of second columnar structures. The second columnar structure protrudes from the light emitting surface, and the extending direction of the second columnar structure is perpendicular to the first light incident surface.

Based on the above, embodiments of the present invention have at least one of the following advantages or effects. By controlling the inclination of the first light-incident surface, the direction in which the light beam is emitted from the light guide plate can be controlled. Therefore, the light guide plate of the above embodiment of the present invention can effectively control the directivity of the light beam. In addition, by guiding the light beam to the angle range favorable for the forward direction of the first die by the first light-incident surface, the energy loss caused by the light beam passing between the light guide plate and the first die can be reduced, therefore, The light source module of the above embodiment can have good light utilization efficiency and brightness.

The above described features and advantages of the invention will be 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 schematic view of a light guide plate in accordance with a first embodiment of the present invention. 1B and 1C are schematic side views of the first side S1 and the second side S2 of the light guide plate of FIG. 1A, respectively. Referring to FIGS. 1A to 1C , the light guide plate 100 includes a first light incident surface SI1 , a light exit surface SE , and a bottom surface SB . The bottom surface SB is opposite to the light-emitting surface SE, and the first light-incident surface SI1 is connected to the bottom surface SB and the light-emitting surface SE. The light guide plate 100 is suitable for the light source module of the light source module. The light source (not shown) of the light source module can be disposed beside the first light incident surface SI1, and the light beam emitted by the light source is from the first input. The smooth surface SI1 enters the light guide plate 100.

The bottom surface SB is formed with a plurality of first strip-shaped grooves T1. FIG. 1A schematically illustrates four first strip-shaped trenches T1 (including the first strip-shaped trenches T11, T12, T13, T14), but the number of the first strip-shaped trenches T1 is not limited thereto. The arrangement direction D1 of the first strip-shaped trench T1 is perpendicular to the first light incident surface SI1. In addition, the extending direction D2 of each of the first strip-shaped trenches T1 is, for example, parallel to the first light-incident surface SI1, that is, the array direction D1 and the extending direction D2 of the first strip-shaped trench T1 are perpendicular to each other, but limit.

Each of the first strip-shaped trenches T1 has a first light-incident surface SR1 and a first backlight surface SS1 connected to the first light-incident surface SR1, wherein the first light-incident surface SR1 is located on the first light-incident surface SI1 and the first backlight surface SS1. between. As shown in FIG. 1C, the first light-incident surface SR1 and the first backlight surface SS1 may be inclined with respect to the bottom surface SB. Further, the inner angle θ1 of the first front surface SR1 and the bottom surface SB and the inner angle θ2 of the first backlight surface SS1 and the bottom surface SB may be greater than 90 degrees and less than 180 degrees, respectively.

By controlling the degree of tilt of the first light-incident surface SR1, the light-emitting direction of the light beam can be controlled, thereby enabling the light guide plate 100 to effectively control the directivity of the light beam. According to different design requirements (such as the type of the cymbal used in the light source module), the internal angle θ1 between the first surface 711 and the bottom surface SB may fall within the range of 160 degrees to 178 degrees, and preferably falls. It is in the range of 160 degrees to 163 degrees or in the range of 176 degrees to 178 degrees. The inner angle θ2 of the first backlight surface SS1 and the bottom surface SB may be smaller than the inner angle θ1 of the first front surface SR1 and the bottom surface SB. For example, the inner angle θ2 of the first backlight surface SS1 and the bottom surface SB may fall within a range of 135 degrees to 150 degrees.

Each of the first light-incident surfaces SR1 includes a plurality of first planes P1. In the present invention, a plane refers to a surface whose curvature approaches infinity, but does not exclude the possibility of a slight curvature of the plane due to process conditions or process parameters. The first plane P1 is spaced apart along the extending direction D2 of each of the first strip-shaped trenches T1. Further, each of the first light-incident surfaces SR1 is not composed of a single plane, but is composed of a discontinuous first plane P1 in which a plurality of discontinuous curved surfaces, a plurality of discontinuous curved surfaces, or a combination thereof are combined.

As shown in FIG. 1A, the light guide plate 100 of the present embodiment may further include a plurality of first columnar structures CS1. FIG. 1A schematically illustrates three first columnar structures CS1 (including the first columnar structures CS11, CS12, CS13), but the number of the first columnar structures CS1 is not limited thereto. The first columnar structure CS1 protrudes from the bottom surface SB, and each of the first strip-shaped trenches T1 and the first columnar structure CS1 has a plurality of staggered portions X (FIG. 1A schematically indicates a staggered portion X). The first plane P1 of each of the first strip-shaped trenches T1 and the first columnar structures CS1 are alternately arranged along the extending direction D2 of each of the first strip-shaped trenches T1, and each of the first strip-shaped trenches T1 corresponds to the staggered portion X. The plurality of first curved surfaces C1, wherein the first plane P1 of each of the first light-incident surfaces SR1 and the first curved surface C1 are alternately disposed in the extending direction D2 such that adjacent first planes P1 in the extending direction D2 are not connected to each other.

In this embodiment, as shown in FIG. 1A and FIG. 1B, the cross-sectional shape of each of the first columnar structures CS1 on the reference plane RF parallel to the first light incident surface SI1 is a circular arc shape, and the first light-incident surface The SR1 is composed of the first plane P1 and the first curved surface C1 which are alternately arranged, but the present invention is not limited thereto. In another embodiment, the cross-sectional shape of each of the first columnar structures CS1 on the reference plane RF parallel to the first light incident surface SI1 may also be a trapezoidal shape or a triangle shape, and each of the first light-incident surfaces SR1 may be alternately set. The first plane P1 and the meandering plane are formed. The meandering surface may be formed by a plurality of planes, and the planes of the meandering planes are connected two by two in the extending direction D2, wherein the two outermost planes are respectively connected to the adjacent first plane P1 and inclined with respect to the first plane P1.

By providing the first columnar structure CS1 with a curved or tortuous surface toward the light exit surface SE, the degree of divergence of the light beam in the extending direction D2 can be converged to achieve a concentrated brightening effect, thereby contributing to the application of the light source of the light guide plate 100. The module omits at least one piece of optical film (eg, a slab that converges the beam of light in the direction of extension D2). Furthermore, the design of the first columnar structure CS1 protruding from the bottom surface SB can improve the adsorption problem of the light guide plate 100 and the optical film (such as the reflection sheet) located under the light guide plate 100, and can maintain the proper relationship between the bottom surface SB and the reflection sheet. the distance. In this way, the movable space of the foreign matter entering between the bottom surface SB and the reflection sheet can be improved, thereby reducing the probability that the large-sized foreign matter is scratched or rubbed by the bottom surface SB due to the pressing of the bottom surface SB, thereby contributing to The generation of the bright spots is lowered, so that the light guide plate 100 has a good optical taste.

Considering the uniformity of the light output of the side-entry light source module to which the light guide plate 100 is applied, in this embodiment, the area of the first light-incident surface SR1 can be modulated, for example, the area of the first light-incident surface SR1 is first. The distance DD1 of the strip-shaped trench T1 and the first light-incident surface SI1 is increased to increase the light-emitting ratio of the light-guide plate 100 away from the first light-incident surface SI1. As shown in FIG. 1C, the method for modulating the area of the first light-incident surface SR1 is, for example, the width W of the first strip-shaped trench T1 in the arrangement direction D1 along with the first strip-shaped trench T1 and the first The distance DD1 of the light incident surface SI1 increases, and the depth DT1 of the first strip trench T1 increases as the distance DD1 between the first strip trench T1 and the first light incident surface SI1 increases.

As shown in FIG. 1C, in the arrangement direction D1, the width W of the first strip-shaped trench T11 is smaller than the width W of the first strip-shaped trench T12, and the width W of the first strip-shaped trench T12 is smaller than the first strip-shaped trench The width W of the groove T13, and the width W of the first strip-shaped groove T13 is smaller than the width W of the first strip-shaped groove T14. Similarly, the depth DT1 of the first strip trench T11 is smaller than the depth DT1 of the first strip trench T12, and the depth DT1 of the first strip trench T12 is smaller than the depth DT1 of the first strip trench T13, and the first The depth DT1 of the strip-shaped trench T13 is smaller than the depth DT1 of the first strip-shaped trench T14 (the first light-incident surface SR1 and the first of each of the first strip-shaped trenches T11, T12, T13, T14 are indicated by a broken line in FIG. 1B The boundary of the backlight surface SS1). In this embodiment, the first strip-shaped trench T1 is disposed at an equal interval I, but is not limited thereto.

2A is a schematic view of a light guide plate in accordance with a second embodiment of the present invention. 2B and 2C are schematic side views of the first side S1 and the second side S2 of the light guide plate of FIG. 2A, respectively. 2D is a top plan view of the light guide plate of FIG. 2A. 2A to 2D, the light guide plate 200 is similar to the light guide plate 100 of FIGS. 1A to 1C, and the same or similar elements are denoted by the same reference numerals, and the relative arrangement relationship between the elements or the functions thereof will not be described herein. .

The main difference between the light guide plate 200 and the light guide plate 100 is that the light guide plate 200 omits the first columnar structure CS1 of FIG. 1A, and the light guide plate 200 includes a plurality of microstructures MS. The microstructures MS are located in the first strip-shaped trenches T1 and are connected to the corresponding first light-incident surface SR1 and the corresponding first backlight surface SS1, wherein the first plane P1 of each first strip-shaped trench T1 and the microstructured MS edge The extending direction D2 of each of the first strip-shaped grooves T1 is alternately disposed such that adjacent first planes P1 in the extending direction D2 are not connected to each other.

In the present embodiment, as shown in FIG. 2B, the cross-sectional shape of each microstructure MS on the reference plane RF parallel to the first light incident surface SI1 is a circular arc shape. By providing the surface (the first curved surface C1) curved or curved toward the light exit surface SE by the microstructure MS, the degree of divergence of the light beam in the extending direction D2 can be converged to achieve the effect of concentrated brightening, thereby contributing to the application of the light guide plate. The light source module of 200 omits at least one piece of optical film (eg, a slab for converging the beam of light in the direction of extension D2).

According to different design requirements, the optical taste of the light guide plate 100 can be changed by adjusting the curvature, shape, arrangement of the microstructure MS, or the area ratio of the microstructure MS to the first plane P1. As shown in FIG. 2B, the curvatures of the microstructures MS located in the different first strip-shaped trenches T1 may be the same. Furthermore, the maximum thickness HMAX of each microstructure MS may be equal to the maximum depth DMAX of the corresponding first strip trench T1. In addition, as shown in FIG. 2D, the microstructures MS may be aligned with each other in the arrangement direction D1. Furthermore, the widths W1, W2 of the microstructures MS in the arrangement direction D1 and the extension direction D2 may increase as the distance DD1 between the corresponding first strip-shaped trenches T1 and the first light-incident surface SI1 increases. However, the invention is not limited to the above.

Other types in which the light guide plate can be implemented will be described below with reference to FIGS. 3 to 5D. 3 is a top plan view of a light guide plate in accordance with a third embodiment of the present invention. 4A is a schematic view of a light guide plate in accordance with a fourth embodiment of the present invention. 4B and 4C are schematic side views of the first side S1 and the second side S2 of the light guide plate of FIG. 4A, respectively. 4D is a top plan view of the light guide plate of FIG. 4A. Figure 5A is a schematic view of a light guide plate in accordance with a fifth embodiment of the present invention. 5B and 5C are schematic side views of the first side S1 and the second side S2 of the light guide plate of FIG. 5A, respectively. FIG. 5D is a schematic top view of the light guide plate of FIG. 5A.

As shown in FIG. 3, the microstructures MS of the light guide plate 300 can be arbitrarily arranged without necessarily being aligned with each other in the arrangement direction D1. In addition, as shown in FIGS. 4A to 4D, the curvature of the microstructure MS may increase as the distance DD1 between the first strip-shaped trench T1 and the first light-incident surface SI1 increases. Further, the width W1 of the microstructure MS in the arrangement direction D1 increases as the distance DD1 of the corresponding first strip-shaped trench T1 and the first light-incident surface SI1 increases, and the microstructure MS is in the extending direction D2. The width W2 decreases as the distance DD1 between the corresponding first strip-shaped trench T1 and the first light-incident surface SI1 increases.

As shown in FIG. 5A to FIG. 5D, the microstructures MS in at least one of the first strip-shaped trenches T1 (eg, the first strip-shaped trenches T14) may be connected. Under this architecture, the first curved surface C1 of the microstructure MS in the first strip-shaped trench T14 is connected to each other and can form a continuous undulating surface.

Figure 6 is a cross-sectional view showing a light source module in accordance with a first embodiment of the present invention. Referring to FIG. 6 , the light source module 10 is, for example, a side-input light source module. The light source module 10 includes a light guide plate 11 , a first light source 12 , and a first die 13 . The light guide plate 11 may be selected from one of the aforementioned light guide plates 100, 200, 300, 400, 500, and the structure of the light guide plate 11 will not be described here. The first light source 12 is located beside the first light incident surface SI1 and is adapted to emit the light beam L toward the first light incident surface SI1. The first cymbal 13 is located above the light-emitting surface SE and has a plurality of first masts 13A, wherein the first masts 13A are arranged along the arranging direction D1, which is adapted to converge the divergence of the light beam L in the arranging direction D1, and Achieve concentrated brightening effect.

The light beam L is guided by the first light-incident surface SR1 to facilitate the forward angle of the first die 13 to reduce the energy loss caused by the light beam L being transmitted back and forth between the light guide plate 11 and the first die 13 Therefore, the light source module 10 has good light utilization efficiency and brightness.

The light source module 10 may further include other optical films, such as the first diffusion sheet 14, the second cymbal sheet 15, and the second diffusion sheet 16, according to different needs. The first diffusion sheet 14, the second cymbal sheet 15, the first cymbal sheet 13, and the second diffusion sheet 16 are sequentially stacked, for example, above the light-emitting surface SE. The second cymbal 15 has a plurality of second masts 15A (only one second mast 15A is illustrated in FIG. 6), and the shape of the second mast 15A can refer to the shape of the first mast 13A. The second masts 15A are arranged along the extending direction D2, which is adapted to converge the degree of divergence of the light beam L in the extending direction D2 to achieve a concentrated brightening effect. In another embodiment, the light guide plate 11 may selectively include a plurality of second columnar structures CS2 (only one is shown by the viewing angle relationship), such as a lenticular lens structure. The second columnar structure CS2 protrudes from the light exit surface SE, and the extending direction of the second columnar structure CS2 is perpendicular to the first light incident surface SI1. In this way, the degree of divergence of the light beam L in the extending direction D2 can be converged. Under this architecture, the second cymbal 15 described above can be selectively omitted.

Figure 7 is a cross-sectional view showing a light source module in accordance with a second embodiment of the present invention. Referring to FIG. 7, the light source module 20 is similar to the light source module 10 of FIG. 6, and similar or identical elements are denoted by the same reference numerals, and the relative arrangement relationship between the elements or the functions thereof will not be described herein. The main difference between the light source module 20 and the light source module 10 is that the first cymbal 13 of the light source module 10 is a positive cymbal, and the first cymbal 13' of the light source module 20 is a reverse cymbal. Specifically, in the design of the positive gusset, the first mast 13A is directed toward the light guide plate 11, and in the design of the reverse cymbal, the first mast 13A' refers to the light guide panel 11. The light source module 20 can also selectively provide the second columnar structure described above. In addition, the light source module 20 may omit the first diffusion sheet 14 and the second diaphragm 15 described above.

The light guide plates of the above embodiments are all exemplified by a single-edge light-introducing light guide plate, but the invention is not limited thereto. Other types in which the light guide plate can be implemented will be described below with reference to FIGS. 8A to 10. Figure 8A is a schematic view of a light guide plate in accordance with a sixth embodiment of the present invention. 8B and 8C are schematic side views of the first side S1 and the second side S2 of the light guide plate of FIG. 8A, respectively. Figure 9 is another side elevational view of the second side S2 of the light guide of Figure 8A. Figure 10 is a schematic illustration of a light guide plate in accordance with a seventh embodiment of the present invention.

8A to 8C, the light guide plate 600 is similar to the light guide plate 100 of FIGS. 1A to 1C, and similar or identical elements are denoted by the same reference numerals, and the relative arrangement relationship between the elements or the functions thereof will not be described herein. . The main difference between the light guide plate 600 and the light guide plate 100 is that the light guide plate 600 is a bilateral light-introducing light guide plate. Specifically, the light guide plate 600 further includes a second light incident surface SI2. The second light incident surface SI2 is opposite to the first light incident surface SI1 and is connected to the bottom surface SB and the light exit surface SE. The light source module of the light guide plate 600 may further include a second light source (not shown), and the second light source is located beside the second light incident surface SI2.

In addition to the first strip-shaped trench T1, the bottom surface SB is formed with a plurality of second strip-shaped trenches T2. The second strip-shaped trench T2 is parallel to the first strip-shaped trench T1. The width W3 of the second strip-shaped trench T2 in the array direction D1 increases as the distance DD2 between the second strip-shaped trench T2 and the second light-incident surface SI2 increases, and the depth DT2 of the second strip-shaped trench T2 As the distance DD2 between the second strip-shaped trench T2 and the second light incident surface SI2 increases, it increases.

Each of the second strip-shaped trenches T2 has a second light-incident surface SR2 and a second backlight surface SS2 connected to the second light-incident surface SR2, wherein the second light-incident surface SR2 is located on the second light-incident surface SI2 and the second backlight surface SS2. between. As shown in FIG. 8C, the second light-incident surface SR2 and the second backlight surface SS2 are respectively inclined with respect to the bottom surface SB, and the inner angle θ3 of the second light-incident surface SR2 and the bottom surface SB and the second backlight surface SS2 and the bottom surface SB The inner angle θ4 of the clip may be greater than 90 degrees and less than 180 degrees, respectively.

In the present embodiment, the inner angle θ3 is equal to the inner angle θ4, and the inner angle θ1, the inner angle θ2, the inner angle θ3, and the inner angle θ4 are equal to each other, but are not limited thereto. As shown in FIG. 9 , in the light guide plate 700 , the inner angle θ3 of the second front surface SR2 and the bottom surface SB may be greater than the inner angle θ4 of the second backlight surface SS2 and the bottom surface SB, and the inner angle θ3 may be equal to The inner angle θ1 and the inner angle θ4 may be equal to the inner angle θ2. For example, the inner angle θ1 of the first light-incident surface SR1 and the bottom surface SB and the inner angle θ3 of the second light-incident surface SR2 and the bottom surface SB may fall within a range of 160 degrees to 178 degrees, respectively. The range is from 160 degrees to 163 degrees and from 176 degrees to 178 degrees. On the other hand, the inner angle θ2 of the first backlight surface SS1 and the bottom surface SB and the inner angle θ4 of the second backlight surface SS2 and the bottom surface SB may fall within the range of 135 to 150 degrees, respectively.

Each of the second light-incident surfaces SR2 includes a plurality of second planes P2, and the second planes P2 are spaced apart along the extending direction D2. Specifically, each of the second strip-shaped trenches T2 and the first pillar-shaped structure CS1 also has a plurality of staggered portions X (FIG. 8A schematically indicates a staggered portion X). The second plane P2 of each of the second strip-shaped trenches T2 and the first columnar structures CS1 are alternately arranged along the extending direction D2, and each of the second strip-shaped trenches T2 has a plurality of second curved surfaces C2 corresponding to the staggered portion X, wherein The second plane P2 of each of the second light-incident surfaces SR2 and the second curved surface C2 are alternately disposed in the extending direction D2 such that the adjacent second planes P2 in the extending direction D2 are not connected to each other. The light guide plates 200, 300, 400, and 500 may be replaced with a bilateral light-introducing light guide plate, and will not be described herein.

Referring to FIG. 10, the light guide plate 800 is similar to the light guide plate 100 of FIGS. 1A to 1C, and the same or like elements are denoted by the same reference numerals, and the relative arrangement relationship between the elements or the effects thereof will not be described herein. The main difference between the light guide plate 800 and the light guide plate 100 is that the first light incident surface SI1 is located at a corner of the light guide plate 800, and the orthographic projection shape of each of the first strip grooves T1 on the bottom surface SB is meandered. In this configuration, the first columnar structures CS1 extend outward from the first light incident surface SI1 to the side opposite to the first light incident surface SI1.

In summary, embodiments of the present invention have at least one of the following advantages or benefits. By controlling the inclination of the first light-incident surface, the direction in which the light beam is emitted from the light guide plate can be controlled. Therefore, the light guide plate of the above embodiment of the present invention can effectively control the directivity of the light beam. In addition, by guiding the light beam to the angle range favorable for the forward direction of the first die by the first light-incident surface, the energy loss caused by the light beam passing between the light guide plate and the first die can be reduced, therefore, The light source module of the above embodiment can have good light utilization efficiency and brightness.

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. In addition, the terms "first", "second" and the like mentioned in the specification or the scope of the claims are only used to name the elements or distinguish different embodiments or ranges, and are not intended to limit the number of elements. Upper or lower limit.

10, 20‧‧‧Light source module
11, 100, 200, 300, 400, 500, 600, 700, 800‧‧‧ light guides
12‧‧‧First light source
13, 13'‧‧‧ first picture
13A, 13A'‧‧‧ first pillar
14‧‧‧First diffuser
15‧‧‧ second picture
15A‧‧‧Second Pillar
16‧‧‧Second diffusion film
C1‧‧‧First surface
C2‧‧‧Second surface
CS1, CS11, CS12, CS13‧‧‧ first columnar structure
CS2‧‧‧Second columnar structure
D1‧‧‧Arranged direction
D2‧‧‧ extending direction
DD1, DD2‧‧‧ distance
DMAX‧‧‧Maximum depth
DT1, DT2‧‧‧ Depth
HMAX‧‧‧Maximum thickness
I‧‧‧ spacing
L‧‧‧beam
MS‧‧‧Microstructure
P1‧‧‧ first plane
P2‧‧‧ second plane
RF‧‧‧ reference plane
S1‧‧‧ first side
S2‧‧‧ second side
SB‧‧‧ bottom
SE‧‧‧Glossy
SI1‧‧‧ first light surface
SI2‧‧‧Second entrance
SR1‧‧‧First Brightness
SR2‧‧‧second illuminating surface
SS1‧‧‧ first backlight
SS2‧‧‧second backlight surface
T1, T11, T12, T13, T14‧‧‧ first strip groove
T2‧‧‧Second strip groove
W, W1, W2, W3‧‧‧ width
X‧‧‧Interlaced θ1, θ2, θ3, θ4‧‧‧ interior angle

1A is a schematic view of a light guide plate in accordance with a first embodiment of the present invention. 1B and 1C are schematic side views of the first side S1 and the second side S2 of the light guide plate of FIG. 1A, respectively. 2A is a schematic view of a light guide plate in accordance with a second embodiment of the present invention. 2B and 2C are schematic side views of the first side S1 and the second side S2 of the light guide plate of FIG. 2A, respectively. 2D is a top plan view of the light guide plate of FIG. 2A. 3 is a top plan view of a light guide plate in accordance with a third embodiment of the present invention. 4A is a schematic view of a light guide plate in accordance with a fourth embodiment of the present invention. 4B and 4C are schematic side views of the first side S1 and the second side S2 of the light guide plate of FIG. 4A, respectively. 4D is a top plan view of the light guide plate of FIG. 4A. Figure 5A is a schematic view of a light guide plate in accordance with a fifth embodiment of the present invention. 5B and 5C are schematic side views of the first side S1 and the second side S2 of the light guide plate of FIG. 5A, respectively. FIG. 5D is a schematic top view of the light guide plate of FIG. 5A. Figure 6 is a cross-sectional view showing a light source module in accordance with a first embodiment of the present invention. Figure 7 is a cross-sectional view showing a light source module in accordance with a second embodiment of the present invention. Figure 8A is a schematic view of a light guide plate in accordance with a sixth embodiment of the present invention. 8B and 8C are schematic side views of the first side S1 and the second side S2 of the light guide plate of FIG. 8A, respectively. Figure 9 is another side elevational view of the second side S2 of the light guide of Figure 8A. Figure 10 is a schematic illustration of a light guide plate in accordance with a seventh embodiment of the present invention.

100‧‧‧Light guide plate

C1‧‧‧First surface

CS1, CS11, CS12, CS13‧‧‧ first columnar structure

D1‧‧‧Arranged direction

D2‧‧‧ extending direction

P1‧‧‧ first plane

S1‧‧‧ first side

S2‧‧‧ second side

SB‧‧‧ bottom

SE‧‧‧Glossy

SI1‧‧‧ first light surface

SR1‧‧‧First Brightness

SS1‧‧‧ first backlight

T1, T11, T12, T13, T14‧‧‧ first strip groove

X‧‧‧Interlaced

Claims (17)

A light guide plate includes a first light incident surface, a light emitting surface and a bottom surface, wherein the bottom surface is opposite to the light emitting surface, the first light incident surface is connected to the bottom surface and the light emitting surface, and the bottom surface is formed with a plurality of first strips a direction of the first strip-shaped trench is perpendicular to the first light-incident surface, and the width of the first strip-shaped trenches in the alignment direction follows the first strip-shaped trenches The distance from the first light incident surface increases, and the depth of the first strip grooves increases as the distance between the first strip grooves and the first light incident surface increases. The first strip-shaped trench has a first light-incident surface and a first backlight surface connected to the first light-incident surface, the first light-incident surface is located between the first light-incident surface and the first backlight surface The first light-incident surface includes a plurality of first planes, and the first planes are spaced apart along an extending direction of each of the first strip-shaped trenches, and the light guide plate further includes a plurality of first columnar structures Projecting from the bottom surface, wherein each of the first strip-shaped trenches and the first columnar structures have a plurality of staggered portions, and each of the first The plurality of first plane and the plurality of strip-like first groove along each of the columnar structure extending in the direction of the first stripe grooves are alternately disposed. The light guide plate according to claim 1, wherein an inner angle of the first light-incident surface and the bottom surface is larger than an inner angle of the first backlight surface and the bottom surface. The light guide plate of claim 1, further comprising: a plurality of microstructures disposed in the first strip-shaped grooves and connected to the corresponding first light-incident surface and the corresponding first backlight surface, The first planes of the first strip-shaped grooves and the microstructures are alternately arranged along the extending direction of each of the first strip-shaped grooves. The light guide plate of claim 3, wherein a cross-sectional shape of each of the microstructures on a reference plane parallel to the first light incident surface is a circular arc shape, and a maximum thickness of each of the microstructures is equal to a corresponding The maximum depth of the first strip of grooves. The light guide plate of claim 3, wherein the microstructures in the different first strip-shaped grooves have the same curvature, and the widths of the microstructures in the arrangement direction and the extension direction correspond to The distance between the first strip-shaped groove and the first light incident surface increases. The light guide plate of claim 3, wherein the curvature of the microstructures increases as the distance between the first strip-shaped trench and the first light-incident surface increases, and the microstructures are arranged in the array The width in the direction increases as the distance between the corresponding first strip-shaped trench and the first light-incident surface increases, and the width of the microstructures in the extending direction increases with the corresponding first strip-shaped trench The distance from the first light incident surface decreases and decreases. The light guide plate of claim 3, wherein the at least one of the first strip-shaped grooves is connected. The light guide plate of claim 1, further comprising: a second light incident surface, the second light incident surface is opposite to the first light incident surface, and the bottom surface and the light exit surface are connected, and the bottom surface is formed. a plurality of second strip-shaped trenches, the second strip-shaped trenches being parallel to the first strip-shaped trenches, and widths of the second strip-shaped trenches in the alignment direction along with the second strips The distance between the strip-shaped trench and the second light-incident surface increases, and the depth of the second strip-shaped trench increases with the distance between the second strip-shaped trench and the second light-incident surface And increasing, each of the second strip-shaped grooves has a first a second light-incident surface and a second backlight surface connected to the second light-incident surface, wherein the second light-incident surface is located between the second light-incident surface and the second backlight surface, wherein each of the second light-incident surfaces comprises a plurality of second planes, and the second planes are spaced apart along the extending direction. The light guide plate of claim 1, wherein the first light incident surface is located at a corner of the light guide plate, and the orthographic projection shape of each of the first strip grooves is meandered. The light guide plate of claim 1, further comprising: a plurality of second columnar structures protruding from the light exiting surface, and extending direction of the second columnar structures perpendicular to the first light incident surface . A light source module includes: a light guide plate, comprising: a first light incident surface, a light emitting surface, and a bottom surface, wherein the bottom surface is opposite to the light emitting surface, the first light incident surface is connected to the bottom surface and the light emitting surface, the bottom surface Forming a plurality of first strip-shaped grooves, an arrangement direction of the first strip-shaped grooves is perpendicular to the first light-incident surface, and a width of the first strip-shaped grooves in the arrangement direction is The distance between the first strip-shaped grooves and the first light-incident surface increases, and the depths of the first strip-shaped grooves follow the first strip-shaped grooves and the first light-incident surface The first strip-shaped groove has a first light-incident surface and a first backlight surface connected to the first light-incident surface, and the first light-incident surface is located on the first light-incident surface Between the first backlights, wherein the first light-incident surface includes a plurality of first planes, and the first planes are spaced apart along an extending direction of each of the first strip-shaped trenches; a first light source, Located beside the first light incident surface; and a first cymbal sheet located above the light exiting surface and having a plurality of first cymbals a column, and the first columns are arranged along the arrangement direction, wherein the light guide plate further comprises a plurality of first columnar structures, the first columnar structures protruding from the bottom surface, wherein each of the first strips The trenches and the first columnar structures have a plurality of staggered portions, and the first planes of the first strip-shaped trenches and the first columnar structures along the first strip-shaped trenches The extension directions are alternately set. The light source module of claim 11, wherein an inner angle of the first light-incident surface and the bottom surface is greater than an inner angle of the first backlight surface and the bottom surface. The light source module of claim 11, further comprising: a second cymbal between the first cymbal and the illuminating surface, the second cymbal having a plurality of second cymbals, And the second masts are perpendicular to the first masts. The light source module of claim 11, wherein the light guide plate further comprises a plurality of microstructures, wherein the microstructures are located in the first strip-shaped grooves and are connected to the corresponding first light-facing surface and corresponding The first backlight surface, wherein the first planes of the first strip-shaped trenches and the microstructures are alternately disposed along the extending direction of each of the first strip-shaped trenches. The light source module of claim 14, wherein each of the microstructures has a circular arc shape on a reference plane parallel to the first light incident surface, and a maximum thickness of each of the microstructures is equal to Corresponding to the maximum depth of the first strip-shaped groove. The light source module of claim 11, wherein the light guide plate further comprises a second light incident surface, the second light incident surface is opposite to the first light incident surface and is connected to the bottom surface and the light exit surface, The bottom surface is further formed with a plurality of second strip-shaped grooves, the second strip-shaped grooves are parallel to the first strip-shaped grooves, and the widths of the second strip-shaped grooves in the arrangement direction are The distance between the second strip-shaped grooves and the second light-incident surface increases, and the depths of the second strip-shaped grooves follow the second strip-shaped grooves and the second light-incident surface Each of the second strip-shaped grooves has a second mating surface and a second backlight surface connected to the second mating surface, and the second mating surface is located on the second light incident surface And the second backlight surface, wherein each of the second light-incident surfaces includes a plurality of second planes, and the second planes are spaced apart along the extending direction, the light source module further includes: a second light source located at Next to the second entrance surface. The light source module of claim 11, wherein the light guide plate further comprises a plurality of second columnar structures, the second columnar structures protrude from the light emitting surface, and the second columnar structures The extending direction is perpendicular to the first light incident surface.