TWI551905B - Light guide plate and backlight module - Google Patents

Description

Light guide plate and backlight module

The present invention relates to a light guiding element, and more particularly to a light guiding plate.

Generally, the light guide plate used in the backlight module has a light incident surface, a light exit surface, and a reflective surface. The light provided by the light source enters the light guide plate from the light incident surface of the light guide plate, and is emitted from the light exit surface of the light guide plate. Another type of light guide plate used on a luminaire has two opposite illuminating surfaces. The light provided by the light source is emitted from the two light-emitting surfaces after entering the light guide plate. In order to make the light passing through the inside of the light guide plate more uniformly mixed, a V-shaped or R-shaped microstructure is usually provided on the light-emitting surface of the light guide plate. However, such a V-shaped or R-shaped microstructure makes the light collecting property of the light guide plate too high and the directivity is too strong. In this way, the light-emitting viewing angle of the light guide plate is bright and dark, thereby producing bright dark spots or hotspots, which affect the optical appearance of the light guide plate.

Furthermore, a light guide plate having a V-shaped microstructure generally has white spots or bright stains on the surface of the V-shaped microstructure due to friction during fabrication or during transportation. Moreover, the tip end portion of the V-shaped microstructure may also be scratched or collapsed due to collision, thereby seriously affecting the function of the light guide plate.

Therefore, there is a need for a light guide plate to solve the above problems.

Therefore, an aspect of the present invention is to provide a light guide plate which utilizes a shape change of a trapezoidal structure, an angle design, a height or a change in depth, and an arrangement to change the light collection degree and optical tendency of the light guide plate, and further The brightness of the light guide plate and the uniformity of light output can be improved. In addition, through the plane of the trapezoidal structure, the light guide plate can be prevented from being damaged due to friction during transportation, thereby improving the yield of the light guide plate.

According to the above object of the present invention, a light guide plate comprising a main body and a plurality of trapezoidal structures is proposed. The body includes a light incident surface, a first major surface, and a second major surface. The second major surface is opposite to the first major surface, and the light incident surface connects the first major surface and the second major surface. The trapezoidal structure is disposed on at least one of the first main surface and the second main surface, and the trapezoidal structures extend from a side close to the light incident surface in a direction away from the other side of the light incident surface. Moreover, the width of each type of trapezoidal structure gradually increases from one end near the light incident surface to the other end away from the light incident surface. Each of the trapezoidal structures includes a plane and two sides. The two sides are respectively connected to the two sides of the plane.

According to an embodiment of the invention, the first major surface is a light exiting surface and the second major surface is a reflective surface.

According to another embodiment of the invention, the first major surface and the second major surface are both light exiting surfaces.

According to still another embodiment of the present invention, the trapezoidal structures described above are disposed on the first major surface and the second major surface, respectively.

According to still another embodiment of the present invention, the trapezoidal structure described above is discontinuously disposed on a side close to the light incident surface.

According to still another embodiment of the present invention, the trapezoidal structure described above is disposed continuously or discontinuously on a side away from the light incident surface.

According to still another embodiment of the present invention, any one of the above-mentioned trapezoidal structures has a pitch therebetween, and the ratio of the distance between the two sides of the plane and the pitch ranges from 5% to 50%.

According to still another embodiment of the present invention, the trapezoidal structure is a convex portion or a concave portion.

According to still another embodiment of the present invention, when the trapezoidal structure is a convex portion, the height of the convex portion gradually increases from one end near the light incident surface to the other end away from the light incident surface.

According to still another embodiment of the present invention, the ratio of the height of the convex portion to the thickness of the body ranges from 1% to 10%.

According to still another embodiment of the present invention, when the trapezoidal structure is a depressed portion, the depth of the depressed portion gradually increases from one end near the light incident surface to the other end away from the light incident surface.

According to still another embodiment of the present invention, the ratio of the depth of the depressed portion to the thickness of the body ranges from 1% to 10%.

According to still another embodiment of the present invention, the distribution area of the above-described trapezoidal structure accounts for 20% to 80% of the total area of at least one of the first main surface and the second main surface.

According to still another embodiment of the present invention, the two sides have an angle between them, and the angle of the angle ranges from 10 degrees to 160 degrees.

According to still another embodiment of the present invention, the two sides are directly connected to the two sides of the plane, and the angle of the included angle ranges from 30 degrees to 160 degrees.

According to still another embodiment of the present invention, the two sides are directly connected to the two sides of the plane, and each side is a curved surface.

According to still another embodiment of the present invention, the two sides are respectively connected to the two sides of the plane through the two arc faces, wherein the distance between the two sides of each plane connected to the arc surface is the platform width and the platform width. defined as:

Where W is the width of the platform, R is the radius of curvature of the curved surface, and ψ is the angle.

According to still another embodiment of the present invention, the radius of curvature R ranges from 5 μm to 200 μm.

100‧‧‧Light guide plate

120‧‧‧ Subject

122‧‧‧Into the glossy surface

124‧‧‧ first major surface

126‧‧‧second main surface

140‧‧‧ class ladder structure

140a‧‧ plane

140b‧‧‧ side

140c‧‧‧ side

140d‧‧‧ curved surface

140e‧‧‧ curved surface

150‧‧‧Blank area

160‧‧‧Light source

200‧‧‧Light guide plate

220‧‧‧ Subject

222‧‧‧ into the glossy surface

224‧‧‧ first major surface

226‧‧‧second main surface

240‧‧‧Class ladder structure

240a‧‧ plane

240b‧‧‧ side

240c‧‧‧ side

250‧‧‧Blank area

260‧‧‧Light source

701‧‧‧ Curve

703‧‧‧ Curve

A1‧‧‧ long axis direction

D‧‧‧Deep

D1‧‧‧ extending direction

H‧‧‧ Height

P ‧‧‧ spacing

P' ‧‧‧ spacing

R‧‧‧ radius of curvature

T‧‧‧ thickness

W ‧‧‧ platform width

Ψ‧‧‧角角

The above and other objects, features, advantages and embodiments of the present invention will become more <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; .

2 is a partial cross-sectional view showing a ladder structure according to one of the first embodiments of the present invention.

Figure 3 is a partial cross-sectional view showing another type of trapezoidal structure in accordance with a first embodiment of the present invention.

Figure 4 is a partial cross-sectional view showing still another type of trapezoidal structure in accordance with a first embodiment of the present invention.

5 is a view showing a light guide plate according to a second embodiment of the present invention. Schematic diagram of the structure.

Figure 6 is a schematic view showing the structure of a light guide plate according to a third embodiment of the present invention.

Figure 7 is a partial cross-sectional view showing a ladder structure of one type according to a third embodiment of the present invention.

FIG. 8 is a schematic structural view of a light guide plate according to a fourth embodiment of the present invention.

FIG. 9 is a schematic structural view of a light guide plate according to a fifth embodiment of the present invention.

FIG. 10 is a schematic structural view of a light guide plate according to a sixth embodiment of the present invention.

Figure 11 is a graph showing the comparison of the luminance performance of a light guide plate according to a first embodiment of the present invention and a conventional light guide plate.

Please refer to FIG. 1 , which is a schematic structural view of a light guide plate according to a first embodiment of the present invention. The light guide plate 100 of the present embodiment can be applied to a backlight module or a lamp. The light guide plate 100 can include a main body 120 and a plurality of strip structures. These strip structures are trapezoidal structures 140. The trapezoidal structure 140 is disposed on the main body 120, and through the trapezoidal structure 140, the degree of light collection of the light guide plate 100 can be simultaneously changed and the optical tendency of the light to enter the light guide plate 100 can be adjusted.

In the light guide plate 100, the main body 120 may be a light transmissive plate or other equivalent light transmissive member. The body 120 mainly includes a light incident surface 122, a first major surface 124, and a second major surface 126. The first major surface 124 and the second major surface 126 are respectively Located on opposite sides of the body 120. In addition, the light incident surface 122 connects the first major surface 124 and the second major surface 126. The light source 160 is disposed adjacent to the light incident surface 122 , and the light generated by the light source 160 can enter the light guide plate 100 from the light incident surface 122 . In some embodiments, when the light guide plate 100 is used in the backlight module, the first major surface 124 may be a light exit surface, and the second major surface 126 may be a reflective surface. In other embodiments, if the light guide plate 100 is applied to the light fixture, the first major surface 124 and the second major surface 126 are both light exiting surfaces.

As shown in FIG. 1, a trapezoidal structure 140 is disposed on the first major surface 124. Moreover, each of the trapezoidal structures 140 extends along an extending direction D1. Further, the light source 160 is extended along a long axis direction A1. The extending direction D1 referred to herein refers to a direction in which the first main surface 124 approaches the light incident surface 122 toward the other side of the first main surface 124 away from the light incident surface 122. That is, these trapezoidal structures 140 are arranged in a line perpendicular to the long axis direction A1. In addition, the width of each of the trapezoidal structures 140 is gradually increased from one end of the trapezoidal structure 140 near the light incident surface 122 to the other end of the trapezoidal structure 140 away from the light incident surface 122, and each of the trapezoidal structures 140 is close to the light incident. One end of the face 122 to the other end remote from the light incident surface 122 is inclined with respect to the main surface (that is, the first major surface 124 shown in FIG. 1) provided by the trapezoidal structures 140.

Referring to FIG. 1 and FIG. 2 together, FIG. 2 is a partial cross-sectional view showing a ladder structure according to one of the first embodiments of the present invention. In the present embodiment, each of the trapezoidal structures 140 may be a convex portion that protrudes from the first major surface 124. Moreover, as shown in FIG. 2, each of the trapezoidal structures 140 includes a flat surface 140a and two side surfaces 140b and 140c. its The two side faces 140b and 140c of the trapezoidal structure 140 are respectively connected to the two sides of the plane 140a. Moreover, this plane 140a can mainly prevent the light guide plate 100 from being damaged during production or transportation. In some embodiments, as shown in FIG. 1, the plane 140a is perpendicular to the major axis direction A1.

Wherein, the side surface 140b and the side surface 140c have an angle ψ. In some embodiments, the angle of the included angle ranges from 10 degrees to 160 degrees. When the angle of the angle ψ is less than 10 degrees, the angle of inclination of the side surface 140b and the side surface 140c is large, which may result in excessive light collection and a problem of bright band. When the angle of the angle ψ is greater than 160 degrees, the slope of the side surface 140b and the side surface 140c is brought closer to the plane, and the ability to collect light is reduced. In the embodiment illustrated in Figure 2, the two side faces 140b and 140c of the trapezoidal structure 140 are directly joined to the two sides of the plane 140a. That is, the cross-sectional profile of the trapezoidal structure 140 of the present embodiment is trapezoidal, and the angle 夹 between the side surface 140b and the side surface 140c may range from 30 degrees to 160 degrees.

Please refer to FIG. 3, which is a partial cross-sectional view showing another type of trapezoidal structure according to the first embodiment of the present invention. In the present embodiment, the two side faces 140b and 140c of the trapezoidal structure 140 are also directly connected to the two sides of the plane 140a, and the two side faces 140b and 140c are arcuate faces. That is, the trapezoidal structure 140 of the present embodiment is constituted by one flat surface 140a and two curved side surfaces 140b and 140c.

Please refer to FIG. 4, which is a partial cross-sectional view showing still another type of trapezoidal structure according to the first embodiment of the present invention. In this embodiment, the two side faces 140b and 140c of the trapezoidal structure 140 are respectively connected to the two sides of the plane 140a through the two curved faces 140d and 140e, and the two side faces 140b and 140c are inclined planes. That is, the cross-sectional profile of the trapezoidal structure 140 of the present embodiment is a trapezoid having an R angle. Wherein, the curved faces 140d and 140e have a radius of curvature R, and the two side faces 140b and 140c also have an angle ψ between them. Moreover, the distance between the two sides of the plane 140a of each of the trapezoidal structures 140 and the curved faces 140d and 140e, respectively, is the platform width W. Therefore, the relationship between the width W of the platform and the angle ψ and the radius of curvature R of the embodiment can be expressed as:

In an embodiment, the angle of the angle ψ may range from 10 degrees to 160 degrees, and the radius of curvature R ranges from 5 μm to 200 μm. Similarly, in the present embodiment, when the angle of the angle ψ is less than 10 degrees or more than 160 degrees, the problem of bright band or the ability to reduce light collection is apt to occur. Moreover, the numerical definition of the radius of curvature R also changes the optical tendency of the trapezoidal structure 140. When the radius of curvature R is less than 5 μm, there is a problem that the radius of curvature R is too small to produce a condition similar to the absence of the R angle, and the effect cannot be exerted, and when the radius of curvature R is larger than 200 μm, it represents two sides of each of the trapezoidal structures 140. 140b and 140c will not easily form an inclined plane, but instead will present the shape of the curved surface, which will affect the adjustment of the overall optical trend.

Please also refer to FIGS. 2 to 4, the distance between the two sides of the plane 140a of each of the trapezoidal structures 140 is the platform width W , and the distance between any two adjacent trapezoidal structures 140 is the pitch P. This pitch P may be the same or different. The degree of density of the arrangement of the trapezoidal structures 140 can be adjusted by adjusting the spacing P between adjacent two types of trapezoidal structures 140. Moreover, the ratio of the width W of the platform to the pitch P ranges from 5% to 50%. To be apparent, the platform width W can be designed in accordance with optical requirements, and the trapezoidal structure 140 can be arranged on the first major surface 124 in a continuous, discontinuous or partially continuous and partially discontinuous manner, whereby the light guide plate 100 can be altered. The degree of light collection further increases the brightness and uniformity of the light guide plate 100. In the present embodiment, the trapezoidal structure 140 is maintained at a constant distance P along the extending direction of the light incident surface 122.

Referring to FIG. 2 to FIG. 4, if the ratio of the width W of the platform to the pitch P is less than 5%, the spacing between adjacent trapezoidal structures 140 is wide, and the ratio of the plane becomes large, which makes it easy to classify. The trapezoidal structure 140 is unable to perform its function and reduces the light collecting ability. If the ratio of the width W of the platform to the pitch P is greater than 50%, the spacing between adjacent trapezoidal structures 140 is narrow and the width W of the platform is wide, resulting in a situation in which the plane ratio becomes large, which also affects the trapezoidal structure. 140 light collection ability.

It is to be understood that the trapezoidal structure 140 of the embodiment shown in Fig. 1 is discontinuously disposed on the side close to the light incident surface 122, and the side away from the light incident surface 122 is continuously disposed. In other embodiments, the side of the trapezoidal structure 140 away from the light incident surface 122 may also be discontinuously disposed. Please refer to FIG. 5, which is a schematic structural view of a light guide plate according to a second embodiment of the present invention. The trapezoidal structure 140 of the embodiment shown in FIG. 5 is discontinuously disposed on a side close to the light incident surface 122, and is also discontinuously disposed on a side away from the light incident surface 122.

Referring to FIG. 1 and FIG. 5 simultaneously, in an embodiment, the distribution area of the trapezoidal structure 140 may be 20% to 80% of the total area of the first major surface 124. That is, between each two adjacent ladder-like structures 140 It is an unstructured blank area 150. Wherein, when the ratio of the distribution area of the trapezoidal structure 140 to the total area of the first main surface 124 is less than 20%, the distribution of the representative trapezoidal structure 140 is less, and the plane proportion becomes larger, which reduces the overall trapezoidal shape. The light collecting ability of the structure 140. When the ratio of the distribution area of the trapezoidal structure 140 to the total area of the first main surface 124 is greater than 80%, the bright band is likely to occur and the overall optical tendency is affected.

Continuing to refer to FIGS. 1 and 5, the width of each of the trapezoidal structures 140 is gradually increased along the extending direction D1, and the height H is also gradually increased along the extending direction D1 so that each of the trapezoidal structures 140 The main surface (ie, the first main surface 124 shown in FIG. 1) disposed opposite to the trapezoidal structures 140 is inclined from one end near the light incident surface 122 to the other end away from the light incident surface 122, and each is made The width of the blank area 150 gradually decreases from the side close to the light incident surface 122 to the other side away from the light incident surface 122. In an embodiment, the body 120 has a thickness T and the trapezoid-like structure 140 has a height H. In the present embodiment, the thickness of the light guide plate 100 in the blank region 150 is maintained constant from the side close to the light incident surface 122 to the other side away from the light incident surface 122. The ratio of the height H to the thickness T of the body 120 ranges from 1% to 10%. The optical tendency of the light guide plate 100 can be changed by changing the width and height H of the trapezoidal structure 140. Wherein, when the ratio of the height H to the thickness T of the main body 120 is less than 1%, the height of the representative trapezoidal structure 140 is closer to the first main surface 124, which produces a plane-like effect, causing the plane ratio to be too large to adjust the optical tendency. Features. When the ratio of the height H to the thickness T of the main body 120 is greater than 10%, the inclination angles of the two side faces 140b and 140c are too large to cause the bright band to be generated. Further, in the present invention In an embodiment, the raised trapezoidal structure 140 is injection molded through a mold. The mold is formed in a portion in which the trapezoidal structure 140 is formed by means of an R-knife, a V-knife or a poly-knives in a knife-like manner, and is formed by shallow-in-depth processing, so that the trapezoidal-like structure 140 has different cross-sectional contour shapes. Thereby, different cross-sectional contour shapes can cause the light guide plate 100 to produce different light collecting effects. In some embodiments, the second major surface 126 may be additionally provided with other ladder-like structures, V-shaped structures, dot structures, or other microstructures having similar functions.

Please refer to FIG. 6 , which is a schematic structural view of a light guide plate according to a third embodiment of the present invention. The light guide plate 200 of the present embodiment may also include a main body 220 and a plurality of strip structures. These strip structures are trapezoidal structures 240. The body 220 includes a light incident surface 222, a first major surface 224, and a second major surface 226. The light source 260 is disposed along the long axis direction A1 and disposed adjacent to the light incident surface 222, and the light generated by the light source 260 can enter the light guide plate 200 through the light incident surface 222. As shown in FIG. 6, a trapezoidal structure 240 is disposed on the first major surface 224. Moreover, each of the trapezoidal structures 240 extends along an extending direction D1. The extending direction D1 referred to herein refers to a direction in which the trapezoidal structure 240 is closer to the light incident surface 222 toward the other side of the trapezoidal structure 240 away from the light incident surface 222. That is, these trapezoidal structures 240 are arranged in a line perpendicular to the long axis direction A1. Similarly, the width of each of the trapezoidal structures 240 gradually increases from the end of the trapezoidal structure 240 near the entrance face 222 to the other end of the trapezoidal structure 240 away from the entrance face 222.

Please refer to FIG. 6 and FIG. 7 simultaneously, wherein FIG. 7 is a partial cross-sectional view showing a ladder structure according to one of the third embodiments of the present invention. In the present embodiment, each of the trapezoidal structures 240 is a recess that is recessed into the first major surface 224. Moreover, as shown in Fig. 7, each of the trapezoidal structures 240 also includes a flat surface 240a and two side surfaces 240b and 240c. Wherein, the two side faces 240b and 240c of the trapezoidal structure 240 can be respectively connected to the two sides of the plane 240a. In the embodiment shown in FIG. 7, the two side faces 240b and 240c of the trapezoidal structure 240 are directly connected to the two sides of the plane 240a, and the angle ψ between the side 240b and the side 240c is in the range of 30. Degree to 160 degrees. In some embodiments, as shown in FIG. 6, the plane 240a is perpendicular to the major axis direction A1.

In an embodiment, the trapezoidal structure 240 can be the same as the trapezoidal structure 140 shown in FIG. 3. The two side faces 240b and 240c of the trapezoidal structure 240 can be curved and directly connected to the two sides of the plane 240a. side. In other embodiments, the trapezoidal structure 240 can also be the same as the trapezoidal structure 140 shown in FIG. 4. The two side faces 240b and 240c of the trapezoidal structure 240 are respectively connected to the plane 240a through two arc faces. Side. Similarly, in the present embodiment, the distance between the two sides of the plane 240a of each of the trapezoidal structures 240 can also be expressed according to the above relation (1), and details are not described herein.

Continuing to refer to FIGS. 6 and 7, the two side edges of the plane 240a of each of the trapezoidal structures 240 are the platform width W , and the distance between any two adjacent trapezoidal structures 240 is the pitch P' . This pitch P' may be the same or different. In the present embodiment, the trapezoidal structure 240 is maintained at a fixed distance P' along the extending direction of the light incident surface 222. The degree of density of the arrangement of the trapezoidal structure 240 can be adjusted by adjusting the spacing P' between adjacent two types of trapezoidal structures 240. Moreover, the ratio of the width W of the platform to the pitch P' ranges from 5% to 50%. To be clear, the platform width W can be designed in accordance with optical requirements, and the trapezoidal structure 240 can also be arranged on the first major surface 224 in a continuous, discontinuous or partially continuous and partially discontinuous manner, thereby changing the light guide. The degree of light collection of 200 further increases the brightness and uniformity of the light guide plate 200. Similarly, in the present embodiment, if the ratio of the width W of the platform to the pitch P' is less than 5% or more than 50%, the light collecting ability of the trapezoidal structure 240 is lowered.

It is to be understood that the trapezoidal structure 240 of the embodiment shown in FIG. 6 is discontinuously disposed on the side close to the light incident surface 222, and the side away from the light incident surface 222 is continuously disposed. In other embodiments, the side of the trapezoidal structure 240 away from the light incident surface 222 may also be discontinuously disposed. Please refer to FIG. 8 , which is a schematic structural view of a light guide plate according to a fourth embodiment of the present invention. The trapezoidal structure 240 of the embodiment shown in FIG. 8 is discontinuously disposed on the side close to the light incident surface 222, and is also discontinuously disposed on the side away from the light incident surface 222.

Referring to FIG. 6 and FIG. 8 simultaneously, in an embodiment, the distribution area of the trapezoidal structure 240 may be 20% to 80% of the total area of the first major surface 224. That is, each two adjacent ladder-like structures 240 are unstructured blank regions 250. Wherein, when the ratio of the distribution area of the trapezoidal structure 240 to the total area of the first main surface 224 is less than 20% or more than 80%, the degree of light collection of the trapezoidal structure 240 or the occurrence of bright bands affecting the overall optical tendency is reduced. problem.

Please continue to refer to Figure 6 and Figure 8, each type of ladder structure The width of 240 is gradually increased along the extending direction D1, and the depth D thereof is gradually deepened along the extending direction D1, so that each of the trapezoidal structures 240 is from one end close to the light incident surface 222 to away from the light incident surface 222. The other end is inclined with respect to the main surface of the trapezoidal structure 240 (that is, the first main surface 224 shown in FIG. 6), and the width of each blank area 250 is from the side close to the light incident surface 222 to The other side away from the light incident surface 222 gradually becomes smaller. In an embodiment, the body 220 has a thickness T and the trapezoid-like structure 240 has a depth D. In the present embodiment, the thickness of the light guide plate 200 in the blank region 250 is maintained constant from the side close to the light incident surface 222 to the other side away from the light incident surface 222. The ratio of the depth D to the thickness T of the body 220 ranges from 1% to 10%. By changing the width and depth D of the trapezoidal structure 240, the optical trend and the profile shape of the light guide plate 200 can be changed, whereby different light collecting effects can be produced. Wherein, when the ratio of the depth D to the thickness T of the main body 220 is less than 1%, the depth of the representative trapezoidal structure 240 is shallower and closer to the first main surface 224, which produces a plane-like effect, causing the plane ratio to be too large, thereby failing to play. The ability to adjust optical trends. When the ratio of the depth D to the thickness T of the main body 220 is greater than 10%, the inclination angles of the two side faces 240b and 240c are too large to cause the bright band to be generated.

Please refer to FIG. 9 and FIG. 10 , which are schematic structural diagrams of different light guide plates according to the fifth embodiment and the sixth embodiment of the present invention. In some embodiments, in addition to providing a trapezoidal structure 240 on the first major surface 224, other trapezoidal, V-shaped, punctiform, or other similar functions may be additionally provided on the second major surface 226. The microstructure. The light guide plate 200 shown in FIG. 9 is a light guide plate with double-sided light output. 200, that is, the first main surface 224 and the second main surface 226 of the light guide plate 200 of the embodiment are all light-emitting surfaces, and are all provided with a trapezoidal structure. Therefore, after the light generated by the light source enters the light guide plate 200 from the light incident surface 222, the light is emitted from the first main surface 224 and the second main surface 226, respectively. The light guide plate 200 shown in FIG. 10 is a single-sided light-emitting plate 200. That is, the first main surface 224 of the light guide plate 200 of the present embodiment is a light-emitting surface, and the first main surface 224 is provided with a trapezoid-like shape. Structure 240. The second major surface 226 is a reflective surface, and the second major surface 226 is provided with a dot structure. Therefore, after the light generated by the light source enters the light guide plate 200 from the light incident surface 222, the light is emitted from the first main surface 224.

Please refer to FIG. 1 and FIG. 11 simultaneously. FIG. 11 is a comparison diagram of luminance performance of the light guide plate and the conventional light guide plate according to the first embodiment of the present invention. The curve 703 in FIG. 11 is a curve obtained according to the measurement data of the light guide plate 140 of the first embodiment, and the angle ψ of the trapezoidal structure 140 such as the light guide plate 100 is 140 degrees. The curve 701 is a curve obtained based on the measurement data of a conventional light guide plate having an R-type structure. The horizontal axis in Fig. 11 indicates the position of each dot from the line close to the light incident surface 122 to the distance from the light incident surface 122. Here, "0" on the horizontal axis indicates the position closest to the light incident surface 122, and "1" indicates the position farthest from the light incident surface 122. As can be seen from Fig. 11, the undulation of the curve 701 is large, indicating that the luminance ratio of each point of the light guide plate changes greatly and the light emission is relatively uneven. In contrast, the curve 703 and the curve 703 are relatively close to each other, indicating that the luminance ratios of the respective points of the light guide plate 100 of the present embodiment are relatively close, and the light emission is relatively uniform. Therefore, it is understood that the luminance effect produced by the light guide plate 100 of the present embodiment is significantly better than that of the conventional light guide plate.

Further, the present invention also compares the difference between the light guide plate of the present embodiment and the conventional light guide plate in the sliding test. In the experiment, the R-shaped structure of the surface of the conventional light guide plate is liable to cause scratches and affect the overall appearance. On the other hand, the plane of the trapezoidal structure such as this case can greatly reduce the problem of scratching, and can effectively improve the light guide plate yield and avoid cost loss.

It can be seen from the above embodiments of the present invention that the present invention utilizes the shape change, the angle design, the height or the depth change, and the arrangement manner of the trapezoidal structure to change the light collection degree and the optical tendency of the light guide plate, thereby improving the brightness of the light guide plate and The light is uniform. Moreover, the plane of the trapezoidal structure can prevent the light guide plate from being damaged due to friction during transportation, thereby improving the yield of the light guide plate.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and the present invention can be modified and modified without departing from the spirit and scope of the present invention. The scope is subject to the definition of the scope of the patent application attached.

100‧‧‧Light guide plate

120‧‧‧ Subject

122‧‧‧Into the glossy surface

124‧‧‧ first major surface

126‧‧‧second main surface

140‧‧‧ class ladder structure

140a‧‧ plane

150‧‧‧Blank area

160‧‧‧Light source

A1‧‧‧ long axis direction

D1‧‧‧ extending direction

H‧‧‧ Height

T‧‧‧ thickness

Claims (14)

A light guide plate comprising: a body comprising: a light incident surface; a first major surface; and a second major surface opposite to the first major surface, wherein the first major surface and the second major surface are respectively Connecting the light incident surface; and a plurality of strip structures disposed on at least one of the first main surface and the second main surface, and the strip structures are located away from the light incident surface The direction of the light incident surface extends, and each of the strip structures is inclined from a side close to the light incident surface to a main surface disposed away from the light incident surface with respect to the main surfaces of the strip structures. The light guide plate of claim 1, wherein the strip structures are non-continuously disposed on a side close to the light incident surface. The light guide plate of claim 1, wherein the strip structures are continuously or non-continuously disposed on a side away from the light incident surface. The light guide plate of claim 1, wherein each of the strip structures is a convex portion or a concave portion. The light guide plate of claim 4, wherein when each of the strip structures is the convex portion, the height of the convex portion is from the end close to the light incident surface to away from the light incident surface The other end of the gradual increase gradually to make each of the strips The structure is inclined from the end adjacent to the light incident surface to the other end disposed away from the light incident surface with respect to the main surface provided by the strip structures. The light guide plate of claim 4, wherein when each of the strip structures is the recessed portion, the depth of the recessed portion is from the end near the light incident surface to the distance from the light incident surface The other end is gradually increased such that each of the strip structures is inclined from the end adjacent to the light incident surface to the other end disposed away from the light incident surface with respect to the main surface provided by the strip structures. The light guide plate of claim 1, wherein the width of each of the strip structures is gradually increased from the end adjacent to the light incident surface to the other end away from the light incident surface. The light guide plate of claim 1, wherein the spacing between each two adjacent strip structures in the extending direction along the light incident surface is maintained constant. The light guide plate of claim 1, wherein each of the two adjacent strip structures is an unstructured blank area. The light guide plate of claim 9, wherein the width of each of the blank areas gradually decreases from a side close to the light incident surface to a side away from the light incident surface. The light guide plate of claim 9, wherein the thickness of the light guide plate in each blank area is from a side close to the light incident surface to a distance away from the light entrance. The other side of the face remains fixed. A light-emitting panel according to any one of claims 1 to 11, and a light source, the light generated by the light source entering the light guide plate from the light incident surface. The backlight module of claim 12, wherein the light source extends along a long axis direction, and the strip structures are arranged perpendicular to the long axis direction. The backlight module of claim 13, wherein each of the strip structures has a plane perpendicular to the long axis direction.