TWM605983U - Light guide plate and light source module - Google Patents

Abstract

A light source module includes a light guide plate and a plurality of light emitting elements. The light guide plate has a light incident surface, and includes a plurality of strip support structures and a plurality of strip light incident structures. The plurality of strip support structures is disposed on the light incident surface. The plurality of strip light incident structures is disposed on the light incident surface. A radius of curvature of a first apex angle of the plurality of strip support structures facing away the light incident surface is greater than a radius of curvature of a second apex angle of the plurality of strip light incident structures facing away the light incident surface. A height of the strip supporting structures in a direction perpendicular to the light incident surface is greater than a height of the strip light incident structures in the direction perpendicular to the light incident surface. A plurality of the strip light incident structures are disposed between any two adjacent strip support structures. The plurality of light emitting elements is disposed beside the light incident surface, and is adapted to emit light to the light incident surface.

Description

Light guide plate and light source module

This creation is related to a light source module, and particularly to a light guide plate and a light source module using the light guide plate.

Generally, a liquid crystal display device includes a liquid crystal display panel and a backlight module. The main function of the backlight module is to provide an illumination source with high brightness and high uniformity.

Backlight modules can be divided into side-type backlight modules and direct-type backlight modules. In the current edge-lit backlight module, a plurality of light-emitting diodes are arranged at intervals beside the light-incident surface of the light guide plate. Therefore, the emitted light enters the light guide plate through the light-incident surface and generates corresponding multiple The multiple bright areas of the light-emitting diode and the dark area between the two light-emitting diodes form a hot spot phenomenon with uneven brightness. When light is irradiated to the display panel, uneven brightness may be seen Image screen.

The solution in the prior art is to perform microstructure processing on the light incident surface to reduce the phenomenon of fireflies. The types of microstructures can be roughly divided into triangular and semicircular pillars. The triangular prism has a better effect of dispersing light, but the sharp part facing the light source can easily scratch the light source and cause damage to the prism. Although the semi-circular pillar is not easy to scratch the light source, the effect of dispersing the light is poor, and the effect of slowing down the firefly phenomenon is limited.

This "prior art" paragraph is only used to help understand the content of this creation. Therefore, the content disclosed in the "prior art" may contain some conventional technologies that do not constitute the common knowledge in the technical field. In addition, the content disclosed in the "prior art" does not represent the content or the problem to be solved by one or more embodiments of this creation, nor does it mean that it has been used by a person with ordinary knowledge in the technical field before this creation application. Know or recognize.

This creation provides a light guide plate that can improve brightness uniformity.

This creation provides a light source module that can improve the brightness uniformity and can avoid damage to the light guide plate and the light-emitting element.

Other purposes and advantages of this creation can be further understood from the technical features disclosed in this creation.

In order to achieve one or part or all of the above objectives or other objectives, the light guide plate provided by an embodiment of the present creation has a light incident surface, and includes a plurality of strip support structures and a plurality of strip light incident structures. A plurality of strip supporting structures are arranged on the light incident surface. A plurality of strip-shaped light incident structures are arranged on the light incident surface. The radius of curvature of the first vertex of the plurality of strip support structures away from the light incident surface is greater than the radius of curvature of the second vertex of the plurality of strip support structures away from the light incident surface, and the strip support structures are perpendicular to the light incident surface. The height in the direction of the surface is greater than the height of the strip-shaped light incident structures in the direction perpendicular to the light incident surface. A plurality of these strip-shaped light incident structures are arranged between any two adjacent strip-shaped support structures.

In an embodiment of the present creation, the aforementioned light incident surface has a plurality of light guide regions arranged at intervals, a plurality of strip support structures and a plurality of strip light entrance structures are arranged in these light guide regions, and each light guide The area is equipped with at least one strip supporting structure.

In an embodiment of the present creation, the above-mentioned multiple strip-shaped light incident structures and multiple strip-shaped support structures are arranged on the entire surface of the light incident surface.

In an embodiment of the present creation, there is a distance between each of the above-mentioned strip-shaped support structures and each strip-shaped light incident structure, and/or there is a distance between any two adjacent strip-shaped light incident structures.

In an embodiment of the present creation, the above-mentioned light guide plate further has a light-emitting surface adjacent to the light-incident surface, and a plurality of strip-shaped supporting structures and a plurality of strip-shaped light-incident structures are respectively along the direction from the light-emitting surface toward the light-emitting surface away from the light-emitting surface. It extends in the first direction, and the strip supporting structures and the strip light incident structures are arranged along the second direction, and the first direction is not parallel to the second direction.

In an embodiment of the present creation, the shape of the aforementioned plurality of strip-shaped support structures is semi-cylindrical, and the radius of curvature is 20 μm to 80 μm.

In an embodiment of the present creation, the shape of the plurality of strip-shaped light incident structures is a triangular column shape, and the angle range of the second vertex angle is 70° ~ 110°.

In an embodiment of the present creation, the height of the plurality of strip-shaped supporting structures in the direction perpendicular to the light incident surface is 10 μm ~ 50 μm, and the plurality of strip-shaped light incident structures are in the direction perpendicular to the light incident surface. The height is 5 μm ~ 30μm.

In order to achieve one or part or all of the above-mentioned purposes or other purposes, the light source module provided in an embodiment of the present creation includes a plurality of light-emitting elements and the above-mentioned light guide plate. The multiple light-emitting elements are arranged beside the light-incident surface and are suitable for emitting light to the light-incident surface.

In an embodiment of the present creation, the above-mentioned light incident surface has a plurality of light guide regions arranged at intervals, and these light guide regions respectively correspond to a plurality of light emitting elements, a plurality of strip support structures, and a plurality of strip light entrance structures. It is arranged in these light guide areas, and each light guide area is equipped with at least one strip supporting structure.

In the light source module of this creative embodiment, the radius of curvature of the first vertex of the plurality of strip-shaped support structures away from the light incident surface is greater than the radius of curvature of the second vertex of the plurality of strip-shaped light structures away from the light incident surface, and The height of these strip-shaped supporting structures in the direction perpendicular to the light-incident surface is greater than the height of these strip-shaped light-incident structures in the direction perpendicular to the light-incident surface, so the strip-shaped light-incident structures can be lowered and arranged beside the light-incident surface Contact with the light-emitting element and cause damage. In addition, since the radius of curvature of the second vertex angle of the strip-shaped light incident structure is small, a better effect of dispersing light can be achieved. When the light emitted by the light-emitting element enters the light guide plate, the strip-shaped light-incident structure can disperse the light so that the light can be transmitted to the light guide plate corresponding to the dark area between the two light-emitting elements, thereby reducing the phenomenon of fireflies and improving the brightness Evenness.

In order to make the above and other purposes, features and advantages of this creation more obvious and easy to understand, the following is a detailed description of preferred embodiments in conjunction with the accompanying drawings.

The aforementioned and other technical content, features and effects of this creation will be clearly presented in the following detailed description of a preferred embodiment with reference to the drawings. The directional terms mentioned in the following embodiments, for example: up, down, left, right, front or back, etc., are only directions for referring to the attached drawings. Therefore, the directional terms used are used to illustrate and not to limit this creation.

FIG. 1 is a three-dimensional schematic diagram of a light source module according to an embodiment of the invention. FIG. 2 is a schematic top view of area A in FIG. 1. Please refer to FIGS. 1 and 2, the light source module 10 of this embodiment includes a light guide plate 100 and a plurality of light emitting elements 200. The light guide plate 100 has a light incident surface 110 and a light output surface 120. The light-emitting surface 120 is adjacent to the light-incident surface 110, specifically, the light-emitting surface 120 is perpendicular to the light-incident surface 110. The multiple light-emitting elements 200 are disposed beside the light-incident surface 110 and are suitable for emitting light L to the light-incident surface 110. Specifically, the light source module 10 of this embodiment is an edge-lit backlight module. The light guide plate 100 includes a plurality of strip supporting structures 130 and a plurality of strip light incident structures 140. The plurality of strip-shaped support structures 130 are disposed on the light-incident surface 110, and the plurality of strip-shaped light-incident structures 140 are also disposed on the light-incident surface 110. The strip supporting structures 130 and the strip light incident structures 140 respectively extend along the first direction B from close to the light exit surface 120 toward away from the light exit surface 120, and the strip support structures 130 and the strip light incident structures 140 extend along Align in the second direction C. The first direction B is not parallel to the second direction C, for example. In this embodiment, the first direction B is, for example, a direction perpendicular to the light-emitting surface 120 (for example, parallel to the normal direction of the light-emitting surface 120), and the second direction C is, for example, a direction parallel to the light-emitting surface 120, or parallel to the light-emitting surface 120. The direction of the surface 120 and the light incident surface 110, but not limited thereto. In particular, the plurality of strip-shaped support structures 130 and the plurality of strip-shaped light-incident structures 140 disposed on the light incident surface 110 are all light-transmissive elements, which are suitable for allowing the light L emitted by the light-emitting element 200 to penetrate and transmit to Inside the light guide plate 100, the strip supporting structure 130 and the strip light incident structure 140 both have a light splitting effect, and the difference lies in the degree of the light splitting effect.

In this embodiment, the light incident surface 110 has a plurality of light guide regions 111 arranged at intervals, and these light guide regions 111 respectively correspond to a plurality of light emitting elements 200, specifically, the light emitting elements 200 are on the light incident surface 110. The width of the projection area expanded by 1.25 times to both sides is the light guide area 111, and the adjacent light guide areas 111 are not connected, but the present creation is not limited to this. The range of the light guide area 111 can be based on the light emitted by the light emitting element 200 The range of L incident on the light incident surface 110 is adjusted. The plurality of strip-shaped support structures 130 and the plurality of strip-shaped light incident structures 140 are, for example, disposed in the light guide regions 111, wherein at least one strip support structure 140 is disposed in each light guide region 111. In one embodiment, the light guide regions 111 can be connected together; in another embodiment, the light guide regions 111 are separated from each other, which means that the light incident surface 110 has regions without microstructures, such as non-light guide regions. The area 111 is not provided with the strip supporting structure 130 or the strip light incident structure 140, but it is not limited thereto.

Please refer to FIG. 1. The number of light-emitting elements 200 in FIG. 1 is three as an example, but it is not limited thereto. The light emitting element 200 can be a light emitting diode (LED), but the invention does not limit the type of light source. The number of light guide regions 111 corresponds to the number of light-emitting elements 200, and the present invention does not particularly limit the number of light guide regions 111 and light-emitting elements 200 if the corresponding configuration relationship is met.

Further, referring to FIG. 2, the curvature radius R1 of the first vertex a1 of the plurality of strip support structures 130 away from the light incident surface 110 is greater than the second vertex of the plurality of strip support structures 140 away from the light incident surface 110 The radius of curvature of a2 (not shown). Specifically, in an embodiment, the shape of the strip support structure 130 is, for example, a triangular prism with a first vertex a1 of a circular arc, and the radius of curvature R1 of the first vertex a1 is 20 μm ~ 80 μm , The first apex angle a1 refers to the apex angle of the strip supporting structure 130 away from the light incident surface 110. In another embodiment, the shape of the strip support structure 130 is, for example, a semi-cylindrical shape. In particular, the so-called "semi-cylindrical" does not limit the arc shape of its cross-section to a semicircular shape. Inferior arc or other smooth curve, and the radius of curvature R1 is 20 μm ~ 80 μm, the first vertex angle a1 here refers to the part of the strip support structure 130 farthest away from the light incident surface 110, for example, if the strip support The cross-sectional shape of the structure 130 is semicircular, and the radius of curvature R1 of the first vertex a1 is the radius of the semicircular cross-section of the strip support structure 130; in other embodiments, the shape of the strip support structure 130 may also be It is a combination of a four-corner column and a half-cylinder, and this creation is not particularly limited. The shape of the strip light incident structure 140 is, for example, a triangular column shape, and the angle range of the second vertex a2 of the strip light incident structure 140 away from the light incident surface 110 is 70°˜110°. Therefore, in this embodiment, the radius of curvature of the second vertex a2 of the strip-shaped light incident structure 140 is close to infinitely small, and the curvature radius of the strip-shaped light incident structure 140 is not shown in FIG. 2, but the present creation is not particularly limited. The form of the strip-shaped light-incident structure 140 only needs to achieve a better effect of dispersing light. For example, due to the limitation of the microstructure manufacturing process, the curvature radius of the second vertex a2 of the strip-shaped light-incident structure 140 can be 1um or 5um. But this creation is not limited to this.

In addition, the height H1 of the strip supporting structures 130 in the direction perpendicular to the light incident surface 110 is greater than the height H2 of the strip light incident structures 140 in the direction perpendicular to the light incident surface 110, and the strip supporting structures 130 For example, the heights H1 of φ are the same as each other, and the heights H2 of the strip-shaped light incident structures 140 are, for example, the same. Specifically, the size of the strip-shaped supporting structures 130 is the same, and the size of the strip-shaped light incident structures 140 is also the same, but not limited to this. In this embodiment, the height H1 of the strip supporting structures 130 is 10 μm-50 μm, and the height H2 of the strip light incident structures 140 is 5 μm-30 μm.

For example, a plurality of strip light incident structures 140 are arranged between any two adjacent strip support structures 130. Specifically, the number of the plurality of strip-shaped light incident structures 140 is, for example, greater than the plurality of strip-shaped support structures 130, but it is not limited thereto. In this embodiment, two strip light incident structures 140 are arranged between any two adjacent strip support structures 130 as an example, but it is not limited thereto. For example, the number of strip-shaped light incident structures 140 arranged between any two adjacent strip-shaped support structures 130 may also be different.

In the light source module 10 of this embodiment, the curvature radius R1 of the first vertex a1 of the plurality of strip-shaped supporting structures 130 away from the light incident surface 110 is larger than the second vertex of the plurality of strip-shaped light incident structures 140 away from the light incident surface 110 The radius of curvature of the angle a2, and the height H1 of the strip-shaped supporting structures 130 in the direction perpendicular to the light incident surface 110 is greater than the height H2 of the strip-shaped light-incident structures 140 in the direction perpendicular to the light incident surface 110. Therefore, the strip-shaped supporting microstructure 130 with the first apex angle a1 of the arc is in contact with the light-emitting element 200 disposed beside the light incident surface 110, and the strip-shaped light-incident structure 140 can avoid contact with the light-emitting element 200 and cause damage, and In order to achieve this effect, in this embodiment, at least one strip supporting structure 130 is configured corresponding to each light guide area 111 of each light emitting element 200. In addition, since the radius of curvature of the second vertex a2 of the strip-shaped light incident structure 140 is small, a better effect of dispersing light can be achieved. When the light L emitted by the light-emitting element 200 is incident on the light guide plate 100, the strip-shaped light-incident structure 140 can disperse part of the light L so that part of the light L can be transmitted to the light guide plate 100, which corresponds to the dark area between the two light-emitting elements 200 , Thereby reducing the phenomenon of fireflies, so it can improve the brightness uniformity.

Fig. 3 is a schematic diagram of a light guide area in another embodiment of the present creation. Please refer to FIG. 3, the light guide area 111a of this embodiment is similar to the light guide area 111 described above in terms of structure and advantages. The only difference is that in the light guide area 111a of this embodiment, each strip-shaped support structure 130 and each adjacent strip For example, there is a distance D1 between the light incident structures 140, and/or there is a distance D2 between any two adjacent strip light incident structures 140, for example. The distance D1 and the distance D2 can be adjusted according to the requirements of different light-emitting effects, and the distance D1 and the distance D2 in this embodiment are, for example, the same, but not limited thereto. In another embodiment, the distance D1 and the distance D2 may be different, for example.

Fig. 4 is a three-dimensional schematic diagram of a light source module according to another embodiment of the invention. 4, the light source module 10a of this embodiment is similar to the above-mentioned light source module 10 in structure and advantages. The only difference is that in the light source module 10a of this embodiment, the multiple strip support structures 130 and the light guide plate 100a The plurality of strip-shaped light incident structures 140 are further arranged on the non-light-guiding area 111 on the light incident surface 110a, that is, the strip-shaped supporting structures 130 and the strip-shaped light incident structures 140 are arranged on the entire surface of the light incident surface 110a. This means that there is no flat area on the surface of the light incident surface 110a, and the surface of the light incident surface 110a is provided with a strip supporting structure 130 or a strip light incident structure 140. In other embodiments, each strip-shaped support structure 130 and each strip-shaped light-incident structure 140 may also be spaced apart, and/or between any two adjacent strip-shaped light-incident structures 140 may also be, for example, It has a pitch, and the pitch between each strip supporting structure 130 and each adjacent strip light incident structure 140 is the same, and/or the distance between any two adjacent strip light incident structures 140 is Similarly, this creation is not particularly limited.

In summary, in the light source module of this creative embodiment, the radius of curvature of the first vertex angle of the plurality of strip-shaped supporting structures away from the light incident surface is larger than the second vertex angle of the plurality of strip-shaped light incident structures away from the light incident surface The radius of curvature of the strip-shaped support structure in the direction perpendicular to the light incident surface is greater than the height of the strip-shaped light incident structure in the direction perpendicular to the light incident surface. Therefore, the strip-shaped light-incident structure can reduce the damage caused by contact with the light-emitting element arranged next to the light-incident surface, and in order to achieve this effect, in this embodiment, each light-guiding area corresponding to each light-emitting element is configured with at least A strip support structure. In addition, since the radius of curvature of the second vertex angle of the strip-shaped light incident structure is small, a better effect of dispersing light can be achieved. When the light emitted by the light-emitting element enters the light guide plate, the strip-shaped light-incident structure can disperse the light so that the light can be transmitted to the light guide plate corresponding to the dark area between the two light-emitting elements, thereby reducing the phenomenon of fireflies and improving the brightness Evenness.

However, the above are only the preferred embodiments of this creation, and should not be used to limit the scope of implementation of this creation, that is, simple equivalent changes and modifications made according to the scope of patent application and new description of this creation, All are still within the scope of this creation patent. In addition, any embodiment of this creation or the scope of the patent application does not have to achieve all the purposes or advantages or features disclosed in the creation. In addition, the abstract part and title are only used to assist the search of patent documents, not to limit the scope of rights of this creation. In addition, the terms "first" and "second" mentioned in this specification or the scope of the patent application are only used to name the element (element) or to distinguish different embodiments or ranges, and are not used to limit the number of elements. Upper or lower limit.

10.10a: light source module 100, 100a: light guide plate 110, 110a: light incident surface 111, 111a: light guide area 120: Glossy Surface 130: Strip support structure 140: Strip light structure 200: light-emitting element A: area a1: the first vertex a2: second top corner B: First direction C: second direction D1, D2: spacing H1, H2: height R1: radius of curvature L: light

FIG. 1 is a three-dimensional schematic diagram of a light source module according to an embodiment of the invention. FIG. 2 is a schematic top view of area A in FIG. 1. Fig. 3 is a schematic diagram of a light guide area in another embodiment of the present creation. Fig. 4 is a three-dimensional schematic diagram of a light source module according to another embodiment of the invention.

10: Light source module

110: Glossy surface

111: light guide area

120: Glossy Surface

130: Strip support structure

140: Strip light structure

200: light-emitting element

a1: the first vertex

a2: second top corner

H1, H2: height

R1: radius of curvature

L: light

Claims (10)

A light guide plate has a light incident surface and includes: A plurality of strip-shaped supporting structures are arranged on the light incident surface; and A plurality of strip light incident structures are arranged on the light incident surface, The radius of curvature of a first vertex of the strip supporting structures away from the light incident surface is greater than the radius of curvature of a second vertex of the strip supporting structures away from the light incident surface, and the strip supports The height of the structure in the direction perpendicular to the light incident surface is greater than the height of the strip light incident structures in the direction perpendicular to the light incident surface, and a plurality of strip support structures are arranged between any two adjacent strip support structures These strip light-incident structures. The light guide plate according to claim 1, wherein the light incident surface has a plurality of light guide regions arranged at intervals, the strip supporting structures and the strip light incident structures are disposed in the light guide regions, and each At least one strip-shaped support structure is configured in the light guide regions. The light guide plate according to claim 1, wherein the strip-shaped light incident structures and the strip-shaped support structures are disposed on the entire surface of the light incident surface. The light guide plate according to claim 1, wherein there is a distance between each of the strip supporting structures and each of the strip light incident structures, and/or any two adjacent strip light incident structures There is a gap between. The light guide plate according to claim 1, further having a light-emitting surface adjacent to the light-incident surface, and the strip-shaped supporting structures and the strip-shaped light-incident structures respectively extend from the light-emitting surface toward the light-emitting surface away from the light-emitting surface. Extends in a first direction of, and the strip support structures and the strip light incident structures are arranged along a second direction, the first direction is not parallel to the second direction. The light guide plate according to claim 1, wherein the shape of the strip supporting structures is semi-cylindrical, and the radius of curvature is 20 μm to 80 μm. The light guide plate according to claim 1, wherein the shape of the strip-shaped light incident structures is a triangular column shape, and the angle range of the second vertex angle is 70°-110°. The light guide plate according to claim 1, wherein the height of the strip-shaped support structures in the direction perpendicular to the light incident surface is 10 μm-50 μm, and the strip-shaped light-incident structures are positioned perpendicular to the light incident surface. The height in the direction is 5 μm ~ 30 μm. A light source module includes: A light guide plate has a light incident surface and includes: A plurality of strip-shaped supporting structures are arranged on the light incident surface; and A plurality of strip light incident structures are arranged on the light incident surface, The radius of curvature of a first vertex of the strip supporting structures away from the light incident surface is greater than the radius of curvature of a second vertex of the strip supporting structures away from the light incident surface, and the strip supports The height of the structure in the direction perpendicular to the light incident surface is greater than the height of the strip light incident structures in the direction perpendicular to the light incident surface, and a plurality of strip support structures are arranged between any two adjacent strip support structures Each of these strip-shaped light incident structures; and A plurality of light emitting elements are arranged beside the light incident surface, and are suitable for emitting a light to the light incident surface. The light source module according to claim 9, wherein the light incident surface has a plurality of light guide regions arranged at intervals, and the light guide regions respectively correspond to the light emitting elements, the strip support structures, and the strips The light incident structure is disposed in the light guide regions, and each of the light guide regions is configured with at least one strip supporting structure.

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