TW202020521A - Light guide plate and backlight module - Google Patents

Abstract

A light guide plate and a backlight module are provided. The light guide plate has a first region and a second region, and includes a body, a plurality of first strip-like microstructures, a plurality of prism-like microstructures and a plurality of diffuser microstructures. The body has a first surface and a second surface opposite to each other and a first side surface, and the first region is closer to the first side surface than the second region. The first strip-like microstructures are formed on the first surface and located in the first region. The first strip-like microstructures extend along a first direction parallel to the first side surface. The prism-like microstructures are concave on the second surface and located in the second region. Each of the prism-like microstructures has a first inclined surface facing the first side surface. The diffuser microstructures are concave on the second surface and located in the first region. The backlight module includes the aforementioned light guide plate.

Description

Light guide plate and backlight module

The invention relates to a light guide plate and a backlight module, and in particular to a light guide plate and a backlight module with a collimation microstructure.

Current electronic devices mostly use flat display modules to display images. Among them, the technology of liquid crystal display modules is more sophisticated and popular. However, since the display panel of the liquid crystal display module itself cannot emit light, there is a backlight module below the display panel to provide the light required for displaying the picture. The backlight module can be mainly divided into an edge type backlight module and a direct type backlight module. The edge-light type backlight module uses the light guide plate to guide the light emitted from the light source arranged on the light incident side of the light guide plate to the light exit surface of the light guide plate, thereby forming a surface light source. Generally speaking, optical microstructures can be formed on the surface of the light guide plate to improve the light uniformity and brightness of the light guide plate, and thereby improve the light extraction efficiency and optical quality of the backlight module.

In addition, there is a light guide plate with collimated microstructures. Because the collimated microstructures on the light guide plate are smooth and the angle of the light incident surface is small, the light needs to be incident on the collimated microstructures multiple times to gradually refract the light guide plate Only the incident angle of the upper surface emits light from the light guide plate. However, since the light guide plate needs to pass through the collimating microstructure many times before it exits the light guide plate, the closer to the light entrance side of the light guide plate, the less light can be emitted, and the light entrance side of the light guide plate A dark band area is formed, which in turn leads to uneven surface light provided by the light guide plate. Moreover, this kind of light guide plate is also not easy to eliminate the hot spot phenomenon of multiple bright and dark areas caused by a plurality of light emitting diodes arranged beside the light incident surface of the light guide plate.

The "prior art" paragraph is only used to help understand the content of the present invention. Therefore, the content disclosed in the "prior art" paragraph may include some conventional technologies that are not known to those of ordinary skill in the art. The content disclosed in the "Prior Art" paragraph does not mean that the content or the problem to be solved by one or more embodiments of the present invention has been known or recognized by those with ordinary knowledge in the technical field before the application of the present invention.

The invention provides a light guide plate with good optical performance.

The invention provides a backlight module with good optical performance.

Other objects and advantages of the present invention can be further understood from the technical features disclosed by the present invention.

In order to achieve one, some or all of the above-mentioned objectives or other objectives, an embodiment of the present invention provides a light guide plate. The light guide plate has a first area and a second area, and includes a plate body, a plurality of first strip-shaped microstructures, a plurality of prism-shaped microstructures, and a plurality of astigmatism microstructures. The plate body has a first surface, a second surface and a first side surface, the first surface and the second surface are opposite to each other, the first side surface connects the first surface and the second surface, and the first area of the light guide plate is relatively The second area is closer to the first side surface. The first strip-shaped microstructure is formed on the first surface of the plate body and is located in the first area. The first strip-shaped microstructures extend along a first direction and are arranged along a second direction, the first direction is parallel to the first side surface, and the second direction is perpendicular to the first direction. The prism-like microstructure is formed on the second surface of the plate body and is located in the second area. Each lenticular microstructure is recessed into the second surface and has a first slanted surface and a second slanted surface, and the first slanted surfaces of the lenticular microstructures face the first side surface. The astigmatic microstructure is formed on the second surface of the plate body and located in the first area. Each astigmatism microstructure is recessed into the second surface and has a first structure surface and a second structure surface. The first structure surfaces of the astigmatism microstructures face the first side surface, and the first structure surfaces are curved surfaces. These The second structural plane faces the first inclined planes of the lenticular microstructures.

In order to achieve one, some or all of the above-mentioned objectives or other objectives, an embodiment of the present invention provides a backlight module. The backlight module includes a light guide plate and a light source. The light source is located beside the first side surface of the light guide plate, wherein the light source is adapted to provide a light beam, the light beam enters the light guide plate through the first side surface, and by the first strip-shaped microstructures and the first The inclined surface changes the traveling direction, and then leaves the light guide plate from the first surface.

In an embodiment of the present invention, each of the above-mentioned first strip-shaped microstructures protrudes from the first surface, and has a first strip-shaped inclined surface and a second strip-shaped inclined surface. The first strip-shaped inclined planes face the first side surface, and the second strip-shaped inclined planes face the second region, and the second strip-shaped inclined planes of each first strip-shaped microstructure have a first angle between the first surface and each of them There is a second included angle between the first inclined surface and the second surface of the micro-structure, and the first included angle is greater than the complementary angle of the second included angle.

In an embodiment of the present invention, each of the above-mentioned first strip-shaped microstructures protrudes from the first surface, and has a first strip-shaped inclined surface and a second strip-shaped inclined surface. The first strip-shaped inclined planes face the first side surface, and the second strip-shaped inclined planes face the second region, and the second strip-shaped inclined planes of each first strip-shaped microstructure have a first angle between the first surface and each of them There is a second angle between the first inclined surface and the second surface of the micro-structure, the angle of the first angle is greater than or equal to 2 degrees and less than or equal to 5 degrees, and the angle of the supplementary angle of the second angle is greater than or equal to 2 degrees and less than or equal to 7 degrees.

In an embodiment of the present invention, each of the first strip-shaped microstructures has a third angle between the first strip-shaped slope and the first surface, and the angle of the third angle is greater than or equal to 45 degrees and less than or equal to 90 degree.

In an embodiment of the present invention, the above-mentioned first area has a first length in the second direction, and the first length is greater than or equal to 3 mm and less than or equal to 5 mm.

In an embodiment of the invention, the intersection curve of the first structure surface and the second structure surface is a circular arc line or an elliptic curve.

In an embodiment of the invention, the above-mentioned first structure surface has a contour line in a cross-section parallel to the second direction, and the contour line is a circular arc line or an elliptic curve.

In an embodiment of the invention, the above light guide plate further includes a plurality of second strip-shaped microstructures. The second strip-shaped microstructures are formed on the first surface of the plate body and located in the second area, wherein the second strip-shaped microstructures extend along the second direction and are arranged along the first direction.

In an embodiment of the present invention, the above-mentioned micro-structures corresponding to each other correspond to each second micro-structure and are arranged in an array.

In an embodiment of the invention, the above-mentioned astigmatism microstructures are arranged in an array.

Based on the above, the embodiments of the present invention have at least one of the following advantages or effects. In the embodiments of the present invention, the backlight module and the light guide plate can achieve good optical performance through the arrangement of the first strip-shaped microstructure and the astigmatism microstructure. In addition, the backlight module can eliminate the dark band area on the light entrance side and the hot spot phenomenon of the interleaved bright and dark areas, thereby providing a uniform surface light source with good optical quality.

In order to make the above-mentioned features and advantages of the present invention more obvious and understandable, the embodiments are specifically described below and described in detail in conjunction with the accompanying drawings.

The foregoing and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description with reference to one of the preferred embodiments of the drawings. Direction terms mentioned in the following embodiments, for example: up, down, left, right, front or back, etc., are only for directions referring to additional drawings. Therefore, the directional terminology is used to illustrate rather than limit the invention.

FIG. 1A is a schematic structural diagram of a backlight module according to an embodiment of the invention. FIG. 1B is a schematic cross-sectional view of the light guide plate of FIG. 1A along line A-A. 1A and 1B, the backlight module 200 of this embodiment includes a light guide plate 100 and a light source 210. For example, in this embodiment, the light source 210 may be a light bar including a plurality of light emitting diode (LED) elements or other types of light emitting elements, and is suitable for providing a light beam.

Specifically, as shown in FIGS. 1A and 1B, in this embodiment, the light guide plate 100 has a first region R1 and a second region R2, and includes a plate body 110 and a plurality of first strip-shaped microstructures 120, a plurality of second strip-shaped microstructures 130, a plurality of prism-shaped microstructures 140, and a plurality of astigmatism microstructures 150. The board 110 has a first surface S1, a second surface S2, and a first side surface SL1. The first surface S1 and the second surface S2 are opposite to each other. The first side surface SL1 connects the first surface S1 and the second surface S2. And the first region R1 of the light guide plate 100 is closer to the first side surface SL1 than the second region R2.

More specifically, as shown in FIGS. 1A and 1B, in this embodiment, the first strip-shaped microstructure 120 and the second strip-shaped microstructure 130 are formed on the first surface S1 of the board body 110, and the first strip The micro-structure 120 is located in the first region R1, and the second micro-structure 130 is located in the second region R2. On the other hand, as shown in FIGS. 1A and 1B, in the present embodiment, the prism-shaped microstructure 140 and the astigmatism microstructure 150 are formed on the second surface S2 of the plate body 110, and the prism-shaped microstructure 140 is located at the In the two regions R2, the astigmatic microstructure 150 is located in the first region R1.

Further, as shown in FIG. 1A, in this embodiment, the first strip-shaped microstructure 120 extends along a first direction D1 and is arranged along a second direction D2, and the second strip-shaped microstructure 130 extends along It extends in the second direction D2 and is arranged along the first direction D1. As shown in FIG. 1A, in this embodiment, the first direction D1 is parallel to the first side surface SL1, and the second direction D2 is parallel to the normal direction of the first side surface SL1. In other words, the second direction D2 is perpendicular to the first direction D1. In order to facilitate the description of the direction of each element or structure in the backlight module 200, a rectangular coordinate system is defined below, where the x-axis is substantially parallel to the first direction D1 and the y-axis is substantially perpendicular to the first of the plate body 110 of the light guide plate 100 The surface S1, and the z-axis is substantially parallel to the second direction D2 and perpendicular to the x-axis and the y-axis, but the rectangular coordinate system is only a coordinate with reference to the additional drawings. Therefore, the coordinate terminology used is for illustration and not for limiting the present invention.

In addition, as shown in FIGS. 1A and 1B, in this embodiment, the first region R1 of the light guide plate 100 has a first length L1 in the second direction D2, and the first length L1 is greater than or equal to 3 mm and less than or equal to 5 Mm. It should be noted that the numerical ranges herein are for illustrative purposes only, and are not intended to limit the present invention.

The detailed structure and relative arrangement relationship between the first strip-shaped microstructure 120 and the lenticular microstructure 140 will be further explained below with reference to FIGS. 2A to 3.

2A and 2B are schematic cross-sectional views of different first strip-shaped microstructures in FIG. 1A. FIG. 3 is a schematic diagram of the optical path of the backlight module of FIG. 1A. Specifically, as shown in FIGS. 2A and 3, in this embodiment, each first strip-shaped microstructure 120 protrudes from the first surface S1 and has a first strip-shaped inclined surface ST1 and a second strip-shaped Bevel ST2. The first strip-shaped inclined surfaces ST1 of the first strip-shaped microstructures 120 face the first side surface SL1, and the second strip-shaped inclined surfaces ST2 face the second region R2. Further, as shown in FIGS. 2A and 3, in this embodiment, the adjacent first strip-shaped slope ST1 of one of the first strip-shaped microstructures 120 and the first The two strip-shaped inclined surfaces ST2 are not connected, and there is a pitch P between the adjacent first strip-shaped microstructures 120, but the invention is not limited thereto. In another embodiment (as shown in FIG. 2B ), the adjacent first strip-shaped slope ST1 of one of the first strip-shaped microstructures 120 can also be in contact with the second strip-shaped surface of another first strip-shaped microstructure 120. The slopes ST2 are connected. At this time, the top of the first strip-shaped microstructure 120 can selectively form a connection surface LS, which connects the first strip-shaped slope ST1 and the second strip-shaped slope ST2, and has a width W, The size of this width W has the same range as the pitch P shown in the embodiment of FIG. 2A.

In other words, these first strip-shaped microstructures 120 can form a plurality of unit strip-shaped microstructures, and each unit strip-shaped microstructure has a gap between them, and these gaps can be connected to the top surface of the trapezoid in a single strip-shaped microstructure (ie, connected The width W of the surface LS) can also appear in the form of the spacing P between two first-shaped microstructures. Moreover, as shown in FIGS. 2A and 2B, in this embodiment, these unit strip-shaped microstructures have a unit length UL and a unit depth D. For example, in this embodiment, the size range of the unit length UL is greater than or equal to 35 microns and less than or equal to 350 microns; the size range of the unit depth D is greater than or equal to 3 microns and less than or equal to 12 microns; the interval (that is, the pitch P or The width W) has a size range of 50 microns or less. It should be noted that the numerical ranges herein are for illustrative purposes only, and are not intended to limit the present invention.

On the other hand, as shown in FIGS. 1A and 3, in this embodiment, each of the micro-structures 140 is recessed into the second surface S2, and has a first inclined surface TS1 and a second inclined surface TS2, and these edges These first inclined surfaces TS1 of the mirror-like microstructure 140 face the first side surface SL1. Further, as shown in FIG. 1A and FIG. 3, in this embodiment, these lenticular microstructures 140 correspond to the second strip-shaped microstructures 130 and are arranged in an array. For example, in this embodiment, the orthographic projection of a second strip-shaped microstructure 130 on the second surface S2 will correspond to the position of a row of lenticular microstructures 140, but due to the The width is not necessarily the same as the width of each lenticular microstructure 140, so the orthographic projection of the second strip-shaped microstructure 130 on the second surface S2 does not completely overlap the position of the lenticular microstructure 140. In other words, these prism-shaped microstructures 140 are located directly under the second strip-shaped microstructures 130, but the invention is not limited thereto. In another embodiment, not shown, the prism-like microstructures 140 may also be arranged in random numbers.

Furthermore, as shown in FIG. 3, in this embodiment, a first included angle θ1 is formed between the second strip-shaped inclined surface ST2 of each first strip-shaped microstructure 120 and the first surface S1, and each of the strip-shaped microstructures The structure 140 has a second angle θ2 between the first inclined surface TS1 and the second surface S2, and the first angle θ1 is greater than the complementary angle of the second angle θ2. For example, in this embodiment, the angle of the first included angle θ1 is greater than or equal to 2 degrees and less than or equal to 5 degrees, and the angle of the complementary angle of the second included angle θ2 is greater than or equal to 2 degrees and equal to or less than 7 degrees. Each first strip-shaped microstructure 120 has a third included angle θ3 between the first strip-shaped inclined surface ST1 and the first surface S1, and the angle of the third included angle θ3 is greater than or equal to 45 degrees and less than or equal to 90 degrees.

Thus, as shown in FIG. 3, in this embodiment, the light source 210 is located beside the first side surface SL1 of the light guide plate 100, and the light beam L provided by the light source 210 enters the light guide plate 100 via the first side surface SL1. In other words, in this embodiment, the first side surface SL1 is the light incident surface of the light guide plate 100. Furthermore, as shown in FIG. 3, in this embodiment, the light beam L can change the traveling direction by the first inclined planes TS1 of the first strip-shaped microstructures 120 and the prism-shaped microstructures 140, and then from the first The surface S1 leaves the light guide plate 100. Further, as shown in FIG. 3, in this embodiment, by the arrangement of the first strip-shaped microstructures 120 of the light guide plate 100, the light beam L can approach the first region R1 on the side of the first side surface SL1, In this way, part of the light can be emitted in advance on the first surface S1 located in or near the first region R1. In this way, the phenomenon of the dark band region formed on the light incident side of the light guide plate 100 can be eliminated, thereby providing a uniform surface light source.

In addition, as shown in FIG. 3, in the present embodiment, the backlight module 200 further includes an optical element 220. For example, the optical element 220 may be an invert. In this embodiment, the optical element 220 has multiple inverse microstructures PMS. The design of the inverse microstructures PMS allows the light beam L to exit the invertible microstructure with a smaller exit angle to achieve light quasi The effect of straightening.

On the other hand, in this embodiment, the arrangement of the astigmatism microstructures 150 of the light guide plate 100 can also be used to eliminate the multiple bright areas and darkness that the light source 210 may cause on the first side surface SL1 side of the light guide plate 100 Hot spot phenomenon in the district. The following will further explain with reference to FIGS. 4A to 4F.

4A is a schematic structural diagram of a plurality of astigmatic microstructures in FIG. 1A. 4B to 4E are schematic structural diagrams of the astigmatic microstructure of FIG. 4A. 4F is a schematic diagram of an optical path through the astigmatic microstructure of FIG. 1A. As shown in FIG. 4A, in this embodiment, each astigmatic microstructure 150 is recessed into the second surface S2 and arranged in an array. In more detail, as shown in FIGS. 4A to 4E, in this embodiment, the astigmatic microstructure 150 has a first structural surface SS1 and a second structural surface SS2, and the first structural surfaces of the astigmatic microstructures 150 SS1 faces the first side surface SL1, and these first structural surfaces SS1 are curved surfaces. On the other hand, in the present embodiment, the second structure planes SS2 face the first inclined planes TS1 of the lenticular microstructures 140, and the second structure plane SS2 is a plane, but the invention is not limited thereto. In another embodiment, the second structural surface SS2 may also include a curved surface. In other words, the second structural surface SS2 may be a flat surface or a curved surface, and the present invention is not limited thereto.

In addition, as shown in FIGS. 4B and 4C, in this embodiment, the first structural surface SS1 and the second structural surface SS2 are connected by a corner CR, and the corner CR is an R-angle structure. Furthermore, as shown in FIG. 4D, in this embodiment, the intersection curve of the first structural surface SS1 and the second structural surface SS2 is a circular arc line or an elliptic curve. In addition, as shown in FIG. 4B, in this embodiment, the first structural surface SS1 has a contour line CL in a cross section parallel to the second direction D2, and the contour line CL is a circular arc line or an elliptic curve.

Further, as shown in FIGS. 4A and 4F, in this embodiment, the first structure surface SS1 of the astigmatic microstructure 150 facing the first side surface SL1 (ie, the light incident surface) is a curved surface, which is beneficial to make incident astigmatism The light beam L of the microstructure 150 diverges. Thus, as shown in FIG. 4F, in this embodiment, the light beam L provided by the light source 210 can be reflected into the first region R1 at various angles to achieve the effect of diffusing light, thereby eliminating the first light source 210 in the light guide plate 100. The hot spot phenomenon of multiple bright and dark areas that may be caused by the side surface SL1.

5A and 5B are light shape distribution diagrams when light enters the light guide plates of various comparative examples. FIG. 5C is a light shape distribution diagram when light enters the light guide plate of FIG. 1A. Please refer to FIGS. 5A and 5B. In the embodiment of FIG. 5A, the light guide plate 500A used is similar to the light guide plate 100 of FIG. 1A, but lacks the configuration of the first strip-shaped microstructure. In the embodiment of FIG. 5B The light guide plate 500B used is also similar to the light guide plate of FIG. 1A, but lacks the configuration of astigmatism microstructures. In this way, as shown in FIG. 5A, the light guide plate 500A and the backlight module formed thereon will have obvious dark band regions on the light incident side. On the other hand, as shown in FIG. 5B, the light guide plate 500B and the backlight module formed thereon may obviously have a plurality of interlaced hot spots of bright and dark areas on the light incident side. On the other hand, as shown in FIG. 5C, in this embodiment, the backlight module 200 using the light guide plate 100 can eliminate the darkness on the light entrance side by the arrangement of the first strip microstructure and the astigmatism microstructure The hot spot phenomenon in the band area and the interleaved bright and dark areas provide a uniform surface light source. Please note that the light guide plates 500A, 500B, and 100 in FIGS. 5A, 5B, and 5C are partially shown.

In summary, the embodiments of the present invention have at least one of the following advantages or effects. In the embodiments of the present invention, the backlight module and the light guide plate can achieve good optical performance through the arrangement of the first strip-shaped microstructure and the astigmatism microstructure. In addition, the backlight module can eliminate the dark band area on the light entrance side and the hot spot phenomenon of the interleaved bright and dark areas, thereby providing a uniform surface light source with good optical quality.

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

100: light guide plate 110: plate body 120: first strip-shaped microstructure 130: second strip-shaped microstructure 140: tin-shaped microstructure 150: astigmatism microstructure 200: backlight module 210: light source 220: optical element AA: Line CL: contour line CR: corner D: unit depth D1: first direction D2: second direction L: beam L1, UL: length LS: connecting surface P: pitch PMS: inverse microstructure R1: first area R2 : Second area S1: First surface S2: Second surface SL1: First side surface SS1: First structured surface SS2: Second structured surface ST1: First strip-shaped inclined surface ST2: Second strip-shaped inclined surface TS1: First Bevel TS2: second bevel W: width x, y, z: axis θ1: first included angle θ2: second included angle θ3: third included angle

FIG. 1A is a schematic structural diagram of a backlight module according to an embodiment of the invention. FIG. 1B is a schematic cross-sectional view of the light guide plate of FIG. 1A along line A-A. 2A and 2B are schematic cross-sectional views of different first strip-shaped microstructures in FIG. 1A. FIG. 3 is a schematic diagram of the optical path of the backlight module of FIG. 1A. 4A is a schematic structural diagram of a plurality of astigmatic microstructures in FIG. 1A. 4B to 4E are schematic structural diagrams of the astigmatic microstructure of FIG. 4A. 4F is a schematic diagram of an optical path through the astigmatic microstructure of FIG. 1A. 5A and 5B are light shape distribution diagrams when light enters the light guide plates of various comparative examples. FIG. 5C is a light shape distribution diagram when light enters the light guide plate of FIG. 1A.

100: light guide plate

110: plate body

120: first microstructure

130: second strip microstructure

140: Porcupine-like microstructure

150: Astigmatism microstructure

200: backlight module

210: light source

A-A: line

D1: First direction

D2: Second direction

L1: Length

R1: first area

R2: Second area

S1: first surface

S2: Second surface

SL1: first side surface

x, y, z: axis

Claims (20)

A light guide plate has a first area and a second area. The light guide plate includes: a plate body having a first surface, a second surface and a first side surface, the first surface and the second surface Opposite to each other, the first side surface connects the first surface and the second surface, and the first area of the light guide plate is closer to the first side surface than the second area; a plurality of first strip-shaped microstructures , Formed on the first surface of the plate and located in the first area, wherein the first strip-shaped microstructures extend along a first direction and are arranged along a second direction, the first direction Parallel to the first side surface, the second direction is perpendicular to the first direction; a plurality of prism-like microstructures formed on the second surface of the plate body and located in the second area, wherein each of the edges The mirror-like microstructure is recessed into the second surface, and has a first inclined surface and a second inclined surface, and the first inclined surfaces of the hull-shaped microstructures face the first side surface; and a plurality of astigmatism microstructures , Formed on the second surface of the plate and located in the first area, wherein each of the astigmatic microstructures is recessed into the second surface, and has a first structure surface and a second structure surface, the astigmatisms The first structure surfaces of the microstructure face the first side surface, and the first structure surfaces are curved surfaces, and the second structure surfaces face the first inclined surfaces of the lenticular microstructures. The light guide plate as described in item 1 of the patent application, wherein each of the first strip-shaped microstructures protrudes from the first surface, and has a first strip-shaped inclined surface and a second strip-shaped inclined surface, and the first The first strip-shaped slopes of the strip-shaped microstructure face the first side surface, and the second strip-shaped slopes face the second area, and the second strip-shaped slopes and the first There is a first included angle between the surfaces, and a second included angle between the first inclined surface and the second surface of each lenticular microstructure, and the first included angle is greater than the complementary angle of the second included angle. The light guide plate as described in item 1 of the patent application, wherein each of the first strip-shaped microstructures protrudes from the first surface, and has a first strip-shaped inclined surface and a second strip-shaped inclined surface, and the first The first strip-shaped slopes of the strip-shaped microstructure face the first side surface, and the second strip-shaped slopes face the second area, and the second strip-shaped slopes and the first There is a first included angle between a surface, and there is a second included angle between the first inclined surface and the second surface of each lenticular microstructure, the angle of the first included angle is greater than or equal to 2 degrees and less than or equal to 5 degrees , And the angle of the supplementary angle of the second included angle is greater than or equal to 2 degrees and less than or equal to 7 degrees. The light guide plate as described in item 2 of the patent application scope, wherein each first strip-shaped microstructure has a third included angle between the first strip-shaped inclined surface and the first surface, and the angle of the third included angle is greater than Equal to 45 degrees and less than or equal to 90 degrees. The light guide plate as recited in item 1 of the patent application range, wherein the first area has a first length in the second direction, the first length being greater than or equal to 3 mm and less than or equal to 5 mm. The light guide plate as described in item 1 of the patent application range, wherein the intersection curve of the first structural surface and the second structural surface is a circular arc or an elliptic curve. The light guide plate as described in item 1 of the patent application range, wherein the first structural surface has a contour line in a cross section parallel to the second direction, and the contour line is a circular arc line or an elliptic curve. The light guide plate as described in item 1 of the patent application scope, further comprising: a plurality of second strip-shaped microstructures formed on the first surface of the plate body and located in the second area, wherein the second strips The micro-structures extend along the second direction and are arranged along the first direction. The light guide plate as described in item 8 of the patent application range, wherein the prism-shaped microstructures correspond to the second strip-shaped microstructures and are arranged in an array. The light guide plate as described in item 1 of the patent application scope, wherein the light-scattering microstructures are arranged in an array. A backlight module includes: a light guide plate having a first area and a second area. The light guide plate includes: a plate body having a first surface, a second surface, and a first side surface, the first A surface and the second surface are opposite to each other, the first side surface connects the first surface and the second surface, and the first area of the light guide plate is closer to the first side surface than the second area; A first strip-shaped microstructure formed on the first surface of the plate and located in the first area, wherein the first strip-shaped microstructures extend along a first direction and along a second Arranged in directions, the first direction is parallel to the first side surface, the second direction is perpendicular to the first direction; a plurality of prism-like microstructures are formed on the second surface of the plate body, and are located on the second In the area, each of the lenticular microstructures is recessed into the second surface, and has a first slanted surface and a second slanted surface, and the first slanted surfaces of the lenticular microstructures face the first side surface And a plurality of astigmatism microstructures formed on the second surface of the plate body and located in the first area, wherein each of the astigmatism microstructures is recessed into the second surface and has a first structure surface and a first Two structural planes, the first structural planes of the astigmatic microstructures face the first side surface, and the first structural planes are curved surfaces, and the second structural planes face the some of the prism-like microstructures A first inclined surface; and a light source located beside the first side surface of the light guide plate, wherein the light source is adapted to provide a light beam, the light beam enters the light guide plate through the first side surface, and through the first strips The micro-structures and the first inclined planes of the micro-structures of the prism shape change the direction of travel, and then leave the light guide plate from the first surface. The backlight module as recited in claim 11 of the patent application, wherein each of the first strip-shaped microstructures protrudes from the first surface and has a first strip-shaped slope and a second strip-shaped slope, and the The first strip-shaped slopes of the strip-shaped microstructures face the first side surface, and the second strip-shaped slopes face the second region, and the second strip-shaped slopes of the first strip-shaped microstructures and the There is a first included angle between the first surfaces, and a second included angle between the first inclined surface and the second surface of each lenticular microstructure, and the first included angle is greater than the complementary angle of the second included angle. The backlight module as recited in claim 11 of the patent application, wherein each of the first strip-shaped microstructures protrudes from the first surface and has a first strip-shaped slope and a second strip-shaped slope, and the The first strip-shaped slopes of the strip-shaped microstructures face the first side surface, and the second strip-shaped slopes face the second region, and the second strip-shaped slopes of the first strip-shaped microstructures and the There is a first included angle between the first surfaces, and there is a second included angle between the first inclined surface and the second surface of each lenticular microstructure, and the angle of the first included angle is greater than or equal to 2 degrees and less than or equal to 5 Degrees, and the angle of the supplementary angle of the second included angle is greater than or equal to 2 degrees and less than or equal to 7 degrees. The backlight module as claimed in item 12 of the patent application range, wherein each first strip-shaped microstructure has a third included angle between the first strip-shaped inclined surface and the first surface, and the angle of the third included angle 45 degrees or more and 90 degrees or less. The backlight module according to item 11 of the patent application range, wherein the first area has a first length in the second direction, and the first length is greater than or equal to 3 mm and less than or equal to 5 mm. The backlight module as recited in item 11 of the patent application range, wherein the intersection curve of the first structural surface and the second structural surface is a circular arc line or an elliptic curve. The backlight module according to item 11 of the patent application scope, wherein the first structural surface has a contour line in a cross section parallel to the second direction, and the contour line is a circular arc line or an elliptic curve. The backlight module as described in item 11 of the patent application scope further includes: a plurality of second strip-shaped microstructures formed on the first surface of the plate body and located in the second area, of which the second The strip-shaped microstructures extend along the second direction and are arranged along the first direction. The backlight module as recited in item 18 of the patent application range, wherein the prism-shaped microstructures correspond to the second strip-shaped microstructures and are arranged in an array. The backlight module as described in item 11 of the patent application scope, wherein the astigmatism microstructures are arranged in an array.

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