CN103424801A - Light guide plate with multi-directional structure - Google Patents

Abstract

The invention provides a light guide plate with a multi-directional structure, which comprises a main body, a plurality of first microstructures and a plurality of second microstructures. The main body comprises a light incident surface, a light emergent surface and a reflecting surface. The reflection surface is opposite to the light-emitting surface. The light incident surface is connected with the light emergent surface and the reflecting surface. The first microstructures are arranged on the light emitting surface or the reflecting surface and are arranged along the first extending direction. The second microstructures are arranged on the light emitting surface or the reflecting surface and are arranged along the second extending direction. The second microstructures and the first microstructures are located on the same plane and are arranged in a crossed mode. Each second microstructure is in a single strip shape, and the width of each second microstructure is gradually reduced from one end close to the light incident surface to the other end far away from the light incident surface.

Description

Light guide plate with multi-directional structure

technical field

The present invention relates to a light guide plate, and in particular to a light guide plate with multi-directional structure.

Background technique

The light guide plate has a light incident surface, a light exit surface and a reflection surface. The light provided by the light source enters the light guide plate from the light incident surface of the light guide plate, and exits from the light exit surface of the light guide plate. In order to make the light sources passing through the inside of the light guide plate more uniformly mixed, microstructures, such as dot microstructures or strip microstructures, are usually provided on the light emitting surface or reflection surface of the light guide plate. However, generally, the surface with dot-like microstructures has a rough structure, and the light will diffuse after contacting the surface of the structure, so that the direction of the light after refracting out of the light guide plate is inconsistent and the light energy is not concentrated, resulting in poor luminance.

Another technique is to arrange strip microstructures with different extending directions on the light emitting surface and the reflecting surface of the light guide plate respectively. The luminance effect produced by the light guide plate with strip microstructure is better than that of the light guide plate with dot structure, but it is easy to produce bright and dark lines and affect the optical appearance of the light guide plate.

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

Contents of the invention

Therefore, one aspect of the present invention is to provide a light guide plate with a multi-directional structure, through which the first microstructure and the second microstructure arranged on the same surface of the light guide plate are crossed to generate and control the light guide plate at the same time. The function of light output angle and optical trend can achieve the effect of mixed light and more uniform light output. Furthermore, through roughening or atomizing the surfaces of the first microstructure and the second microstructure, the uniformity of the overall light emitting appearance of the light guide plate can be improved. In addition, both the aforementioned first microstructure and the second microstructure can be manufactured by utilizing existing microstructure process and equipment, without additional purchase of new process equipment, and thus will not cause a burden on the process cost.

According to the above objective of the present invention, a light guide plate with multi-directional structure is proposed, which includes a main body, several first microstructures and several second microstructures. The main body includes a light incident surface, a light exit surface and a reflection surface. The reflective surface is opposite to the light-emitting surface. The light incident surface connects the light emitting surface and the reflecting surface. The first microstructures are arranged on the light emitting surface or the reflecting surface, and the first microstructures are arranged along the first extending direction. The second microstructure is arranged on the light emitting surface or the reflecting surface, and the second microstructure is arranged along the second extending direction. Wherein, the second microstructure and the first microstructure are located on the same plane and intersect each other. Moreover, each second microstructure is in the form of a single strip, and the width of each second microstructure is gradually reduced from one end close to the light incident surface to the other end far away from the light incident surface.

According to an embodiment of the present invention, the above-mentioned second microstructures intercept each of the first microstructures.

According to another embodiment of the present invention, the above-mentioned first extending direction is perpendicular to the second extending direction.

According to yet another embodiment of the present invention, each of the above-mentioned first microstructures or each of the second microstructures is a convex portion or a concave portion.

According to yet another embodiment of the present invention, when each second microstructure is a convex portion, the height of the convex portion gradually decreases from one end close to the light-incident surface to the other end away from the light-incident surface. When the two microstructures are depressions, the depth of the depressions gradually decreases from one end close to the light incident surface to the other end away from the light incident surface.

According to yet another embodiment of the present invention, each of the above-mentioned first microstructures has a V-shaped or inverted V-shaped cross-sectional profile, and a first clamp is formed between the two surfaces of each first microstructure and the light-emitting surface or the reflecting surface. angle and the second included angle.

According to yet another embodiment of the present invention, the cross-sectional profile of each of the above-mentioned second microstructures is V-shaped, inverted V-shaped, arc-shaped or trapezoidal

According to yet another embodiment of the present invention, the pitches between any two adjacent ones of the above-mentioned first microstructures are the same, and the pitches between any two adjacent ones of the second microstructures are the same.

According to yet another embodiment of the present invention, the pitches between any adjacent two of the above-mentioned first microstructures are the same, and the pitches between any adjacent two of the second microstructures are different.

According to yet another embodiment of the present invention, the pitches between any adjacent two of the above-mentioned first microstructures are different, and the pitches between any adjacent two of the second microstructures are the same.

According to yet another embodiment of the present invention, the pitches between any two adjacent ones of the above-mentioned first microstructures are different, and the pitches between any two adjacent ones of the second microstructures are different.

According to yet another embodiment of the present invention, the surfaces of at least a part of the first microstructures are matte, textured or rough.

According to yet another embodiment of the present invention, the surfaces of at least a part of the second microstructures are matte, textured or rough.

Description of drawings

In order to make the above and other objects, features, advantages and embodiments of the present invention more obvious and understandable, the accompanying drawings are described as follows:

FIG. 1 is a schematic structural diagram of a light guide plate with an omnidirectional structure according to a first embodiment of the present invention.

FIG. 2 is a partial cross-sectional view of a first microstructure according to the first embodiment of the present invention.

FIG. 3 is a partial cross-sectional view of another first microstructure according to the first embodiment of the present invention.

FIG. 4 is a partial cross-sectional view of a second microstructure according to the first embodiment of the present invention.

FIG. 5 is a partial cross-sectional view of another second microstructure according to the first embodiment of the present invention.

FIG. 6 is a schematic structural diagram of a light guide plate with an omnidirectional structure according to the second embodiment of the present invention.

FIG. 7 is a graph showing light field distribution curves according to the third embodiment of the present invention and Comparative Example 1, Comparative Example 2, and Comparative Example 3.

FIG. 8 is a graph showing the light field distribution curves according to the third embodiment of the present invention and comparison 4 and comparison example 5.

Each mark in the figure is: 100 light guide plate; 120 main body; 122 light incident surface; 124 light exit surface; 126 reflective surface; 140 first microstructure; 140a surface; 140b surface; 160 second microstructure; 180 V-shaped structure; ; 200 light guide plate; 220 main body; 222 light incident surface; 224 light exit surface; 226 reflective surface; 240 first microstructure; 260 second microstructure; 280 V-shaped structure; 290 light source; Curve; 820 curve; 840 curve; D depth; D1 first extension direction; D2 second extension direction; H height; P spacing; P' spacing; W width; α first angle; β second angle.

Detailed ways

Please refer to FIG. 1 , which is a schematic structural diagram of a light guide plate with multi-directional structure according to the first embodiment of the present invention. The light guide plate 100 of this embodiment can be applied to a backlight module (not shown). The light guide plate 100 may include a main body 120 , a plurality of first microstructures 140 and a plurality of second microstructures 160 . Through the first microstructure 140 and the second microstructure 160 disposed on the main body 120 , it is possible to simultaneously change and adjust the exit angle and optical trend of the light emitted from the light guide plate 100 .

In the light guide plate 100, the main body 120 can be a light-transmitting plate or other equivalent light-transmitting components. The main body 120 mainly includes a light incident surface 122 , a light output surface 124 and a reflective surface 126 . The reflective surface 126 and the light emitting surface 124 are respectively located on opposite sides of the main body 120 . In addition, the light incident surface 122 is connected to the light exit surface 124 and the reflective surface 126 , that is, two opposite sides of the light incident surface 122 are in contact with one side of the light exit surface 124 and one side of the reflective surface 126 respectively. Wherein, the light source 190 is disposed beside the light incident surface 122 , and the light generated by the light source 190 can enter the light guide plate 100 through the light incident surface 122 . The first microstructure 140 and the second microstructure 160 are located on the same plane. That is to say, the first microstructure 140 and the second microstructure 160 are disposed on the light emitting surface 124 or the reflecting surface 126 at the same time. In some other embodiments, the first microstructure 140 and the second microstructure 160 can be disposed on both the light emitting surface 124 and the reflecting surface 126 . Moreover, the first microstructures 140 and the second microstructures 160 on the same surface are arranged to cross each other. In one embodiment, a second microstructure 160 can intercept each of the first microstructures 140 .

As shown in FIG. 1 , all the first microstructures 140 are arranged on the light-emitting surface 124 along the first extending direction D1 . On the other hand, all the second microstructures 160 are arranged on the light emitting surface 124 along the second extending direction D2. Wherein, each of the second microstructures 160 may be in the form of a single strip. Moreover, the width of each second microstructure 160 is gradually reduced from an end close to the light incident surface 122 to a direction away from the light incident surface 122 . Since the first microstructures 140 and the second microstructures 160 on the same surface are disposed across each other, the second extending direction D2 is different from the first extending direction D1. In one embodiment, the first extending direction D1 is perpendicular to the second extending direction D2, but not limited thereto. To clarify, FIG. 1 is an illustration of an embodiment in which the first microstructure 140 and the second microstructure 160 are simultaneously disposed on the light-emitting surface 124 , and is not intended to limit the present invention. The first microstructure 140 and the second microstructure 160 can also be disposed on the reflective surface 126 at the same time.

Please refer to FIG. 1 and FIG. 2 together. FIG. 2 is a partial cross-sectional view of a first microstructure according to the first embodiment of the present invention. In one embodiment, each first microstructure 140 may be a convex portion protruding from the light-emitting surface 124 , and a cross-sectional profile of each first microstructure 140 is an inverted V shape. Moreover, each first microstructure 140 has two surfaces 140 a and 140 b connected to the light-emitting surface 124 . A first angle α and a second angle β are respectively formed between the two surfaces 140 a and 140 b and the light-emitting surface 124 . Wherein, the angles of the first included angle α and the second included angle β can be designed according to the different angles of the light entering the light guide plate 100, so that the light exit angle after the light enters the light guide plate 100 can be changed to improve the overall light guide plate 100. Luminous flux and brightness value. At the same time, the shape of each first microstructure 140 will also change with the angle change of the first included angle α and the second included angle β, and the vertical height between the top of each first microstructure 140 and the light-emitting surface 124 also changes. subject to change. In one embodiment, V-shaped structures 180 or other microstructures with similar functions may be additionally provided on the reflective surface 126 .

Please refer to FIG. 2 and FIG. 3 at the same time. FIG. 3 is a partial cross-sectional view of another first microstructure according to the first embodiment of the present invention. In the embodiment shown in FIG. 2 , the first microstructures 140 are arranged in a continuous manner, and these first microstructures 140 are directly connected to each other. In the embodiment shown in FIG. 3 , the first microstructures 140 are arranged discontinuously, and each first microstructure 140 is not connected to each other. To clarify, the first microstructures 140 can be arranged on the light emitting surface 124 or the reflecting surface 126 in a continuous, discontinuous, or partially continuous and partially discontinuous manner. Moreover, the pitch P between any two adjacent first microstructures 140 may be the same or different. By adjusting the spacing P between two adjacent first microstructures 140 to adjust the density of the arrangement of the first microstructures, the luminance and luminous flux of the light guide plate 100 can also be changed, thereby improving the uniformity of light output from the light guide plate 100 Spend.

Please refer to FIG. 1 and FIG. 4 together. FIG. 4 is a partial cross-sectional view of a second microstructure according to the first embodiment of the present invention. In this embodiment, the second microstructure 160 can be a concave portion that is recessed into the light-emitting surface 124 , and the cross-sectional profile of the second microstructure 160 is arc-shaped. Moreover, each second microstructure 160 is located on the light emitting surface 124 and extends along the first extending direction D1 to intercept all the first microstructures 140 . In one embodiment, the depth D of the second microstructure 160 gradually decreases from an end close to the light-incident surface 122 to a direction away from the light-incident surface 122 . In one example, by adjusting the depth D and width W of the second microstructure 160, the distance between the remaining first microstructures 140 after being truncated and the remaining first microstructures 140 after being truncated can be changed. length. Therefore, by changing the depth D and width W of the second microstructure 160 , the optical trend of the light guide plate 100 can be changed.

Please refer to FIG. 5 , which is a partial cross-sectional view of another second microstructure according to the first embodiment of the present invention. In this embodiment, the cross-sectional profile of the second microstructure 160 is trapezoidal. In one example, the cross-sectional profile of the second microstructure 160 may be V-shaped. In some examples, the cross-sectional profile of the second microstructure 160 may be, for example, a profile formed by R knife, V knife, flat knife or polycrystalline knife. Different cross-sectional contour shapes can make the light guide plate 100 produce different light-collecting effects.

To clarify, the second microstructures 160 shown in FIG. 4 and FIG. 5 are not connected to each other, but in other embodiments, the second microstructures 160 can also be connected to each other and arranged in a continuous manner . Moreover, the pitch P' between any two adjacent second microstructures 160 may be the same or different. By adjusting the pitch P' between two adjacent second microstructures 160, the density of the arrangement of the second microstructures 160 can be adjusted, thereby improving the light guiding function of the light guide plate 100.

Please refer to FIG. 6 , which is a schematic structural diagram of a light guide plate with multi-directional structure according to the second embodiment of the present invention. The light guide plate 200 of this embodiment may also include a main body 220 , a plurality of first microstructures 240 and a plurality of second microstructures 260 . The main body 220 includes a light incident surface 222 , a light output surface 224 and a reflective surface 226 . The light source 290 is disposed beside the light incident surface 222 , and the light generated by the light source 290 can enter the light guide plate 200 through the light incident surface 222 . Wherein, both the first microstructure 240 and the second microstructure 260 are convex portions protruding from the light-emitting surface 224 . The cross-sectional profiles of the first microstructure 240 and the second microstructure 260 are inverted V-shaped and arc-shaped respectively. Wherein, all the first microstructures 240 are arranged on the light-emitting surface 224 along the first extending direction D1, and all the second microstructures 260 are arranged on the light-emitting surface 224 along the second extending direction D2 and each of the first microstructures 260 is arranged on the light-emitting surface 224 along the second extending direction D2. A microstructure 240 intersects the first microstructure 240 . Wherein, each of the second microstructures 260 can also be in the form of a single strip. Moreover, the width W of each second microstructure 260 gradually decreases from an end close to the light incident surface 222 to a direction away from the light incident surface 222 . In another embodiment, the height H of the second microstructure 260 gradually decreases from an end close to the light incident surface 222 to a direction away from the light incident surface 222 .

In one embodiment, by adjusting the height H and width W of the second microstructure 260, the distance between each remaining first microstructure 240 after truncation and the remaining first microstructure 240 after being truncated can be changed. The length of the microstructure 240 . Therefore, by changing the height H and width W of the second microstructure 260, the optical trend of the light guide plate 200 can be changed. In one embodiment, V-shaped structures 280 or other microstructures with similar functions may be additionally provided on the reflective surface 226 .

Hereinafter, the third embodiment is compared with the conventional light guide plate. Please refer to FIG. 7 , which shows the light field distribution curves according to the third embodiment of the present invention and Comparative Example 1, Comparative Example 2 and Comparative Example 3. Among them, in the third embodiment, a V-shaped structure is arranged on the light-emitting surface of the light guide plate, and the first microstructure and the second microstructure are arranged on the reflective surface. Comparative example 1 is generally a light guide plate with a dotted structure on one side, and comparative example 2 is A light guide plate with a V-shaped structure is provided on the light-emitting surface and a dot-shaped structure is provided on the reflective surface. Comparative Example 3 is a light guide plate with a V-shaped structure provided with different extending directions on the light-emitting surface and the reflective surface. It can be seen from FIG. 7 that the thickest curve 700 in the figure is the curve obtained based on the simulated experimental data of the light guide plate of the third embodiment, compared with other curves obtained based on the simulated experimental data of Comparative Examples 1, 2 and 3 720, 740 and 760 smooth. This means that the distribution angle of the light field can be effectively controlled through the intersecting first microstructure and the second microstructure. The unevenness of the curves 720 , 740 , and 760 in Comparative Example 1-3 represents the noise of light energy loss, which means that the control effect on the light field distribution angle is poor.

Please refer to Table 1 below, which is a comparison of the luminance produced by combining the light guide plates of the third embodiment, comparative example 1, comparative example 2 and comparative example 3 with three optical films and four optical films respectively surface. It can be seen from Table 1 that in Comparative Example 3, the design of the light guide plate with V-shaped structures with different extension directions on the light-emitting surface and the reflecting surface is helpful to improve the luminance. However, the structural design of the light guide plate in Comparative Example 3 will lead to problems of adsorption between the light guide plate and the optical film and bright and dark fringes. On the contrary, because the light guide plate of the third embodiment has both the first microstructure and the second microstructure on the reflective surface, it can not only overcome the above-mentioned problems of light guide plate and optical film adsorption and bright and dark lines, but also produce better brightness effect.

Table 1 Brightness Comparison Table of the Third Embodiment and Comparative Examples 1-3

Please refer to FIG. 8 , which shows the light field distribution curves according to the third embodiment of the present invention and comparison 4 and comparison example 5. Among them, Comparative Example 4 is a light guide plate with a V-shaped structure on the light-emitting surface and a sandblasting structure on the reflective surface, and Comparative Example 5 is a light guide plate with a vertical V-shaped structure on the light-emitting surface and microlenses on the reflective surface. It can be seen from FIG. 8 that the thickest curve 700 in the figure is the curve obtained based on the simulated experimental data of the light guide plate of the third embodiment. Compared with other curves 820 and 840 smooth. This means that the distribution angle of the light field can be effectively controlled through the intersecting first microstructure and the second microstructure. The unevenness of other curves 820 and 840 represents the noise of light energy loss, which means that the control effect on the light field distribution angle is poor.

Please refer to Table 2 below, which is a comparison table of luminance generated by combining the light guide plates of the aforementioned third embodiment, comparative example 4 and comparative example 5 with a turning film respectively. It can be seen from Table 2 that the luminance effect produced by the light guide plate of the third embodiment is obviously better than that of Comparative Example 4 and Comparative Example 5.

Table 2 Brightness Comparison Table of the Third Embodiment and Comparative Examples 4-5

Comparative example 4 Comparative Example 5 third embodiment Brightness 5356(nit) 4329(nit) 7177(nit) gain 1.0 0.81 1.34

In some embodiments, in addition to the first microstructures 140 and 240 and the second microstructures 160 and 260 of the light guide plates 100 and 200 themselves can allow the light guide plates to adjust the light exit angle and optical trend at the same time, the first microstructures 140 and 240 Or the surface of the second microstructures 160 and 260 can also be processed into a matte, textured or rough surface by sandblasting or laser to strengthen the first microstructures 140 and 240 and the second microstructures 160 and 260 dimming effect.

It can be seen from the above-mentioned embodiments of the present invention that the advantage of the present invention is that the first microstructure and the second microstructure intersecting on the same surface of the light guide plate are used to simultaneously control the light output angle and optical trend of the light guide plate. And it can achieve the effect of mixing light and emitting light more uniformly. Furthermore, through roughening or atomizing the surfaces of the first microstructure and the second microstructure, the uniformity of the overall light emitting appearance of the light guide plate can be improved. In addition, both the aforementioned first microstructure and the second microstructure can be manufactured by utilizing existing microstructure process and equipment, without additional purchase of new process equipment, and thus will not cause a burden on the process cost.

Although the present invention has been disclosed above in terms of implementation, it is not intended to limit the present invention. Anyone skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the present invention The scope of protection shall prevail as defined in the scope of the appended patent application.

Claims (13)

1. A light guide plate with a multidirectional structure, characterized in that it comprises: a subject, including: a light incident surface; a shiny surface; and a reflective surface, opposite to the light-emitting surface, wherein the light-incident surface connects the light-emitting surface and the reflective surface; A plurality of first microstructures are arranged on the light-emitting surface or the reflective surface, and the first microstructures are arranged along a first extending direction; and A plurality of second microstructures are arranged on the light-emitting surface or the reflective surface, wherein the second microstructures are arranged along a second extending direction, and the second microstructures are located at the same location as the first microstructures arranged on a plane and intersecting each other, wherein each of the second microstructures is in a single strip shape, and the width of each of the second microstructures is from one end close to the light-incident surface to the end far away from the light-incident surface The other end tapers off. 2. The light guide plate with multi-directional structure according to claim 1, wherein each of the second microstructures intercepts each of the first microstructures. 3. The light guide plate with multi-directional structure according to item 1 of the claim, wherein the first extending direction is perpendicular to the second extending direction. 4. The light guide plate with multi-directional structure as described in item 1 of the claim, wherein each of the first microstructures or each of the second microstructures is a convex portion or a concave portion . 5. The light guide plate with multi-directional structure as described in item 4 of the claim, wherein when each of the second microstructures is a convex portion, the height of the convex portion is from close to the light-incident The end of the surface is gradually reduced to the other end away from the light incident surface, wherein when each of the second microstructures is the depression, the depth of the depression is from the end close to the light incident surface to the end far away from the light incident surface. The other end of the light incident surface gradually narrows. 6. The light guide plate with multi-directional structure as described in item 1 of the claim, characterized in that the cross-sectional profile of each of the first microstructures is V-shaped or inverted V-shaped, and each of the first microstructures The two surfaces of the microstructure form a first included angle and a second included angle with the light-emitting surface or the reflecting surface. 7. The light guide plate with multi-directional structure according to item 1 of the claim, wherein each of the second microstructures has a V-shaped, inverted V-shaped, arc-shaped or trapezoidal cross-sectional profile. 8. The light guide plate with multi-directional structure as described in item 1 of the claim, characterized in that the distance between any adjacent two of the first microstructures is the same, and any adjacent two of the second microstructures The spacing between the two is the same. 9. The light guide plate with multi-directional structure as described in item 1 of the claim, characterized in that the distance between any adjacent two of the first microstructures is the same, and any adjacent two of the second microstructures The distance between the two is not the same. 10. The light guide plate with multi-directional structure as described in item 1 of the claim, characterized in that the distance between any adjacent two of the first microstructures is different, and the distance between any two adjacent ones of the second microstructures is The distance between any adjacent two is the same. 11. The light guide plate with multi-directional structure as described in item 1 of the claim, characterized in that the distance between any adjacent two of the first microstructures is different, and the distance between any two adjacent ones of the second microstructures is The distance between any adjacent two is not the same. 12. The light guide plate with multi-directional structure as claimed in item 1, characterized in that at least a part of the surfaces of the first microstructures are matte, textured or rough. 13. The light guide plate with multi-directional structure as claimed in item 1, characterized in that at least a part of the surfaces of the second microstructures are matte, textured or rough.

Images