Light guide plate and light source device

Abstract

The present invention provides a light guide plate and a light source device capable of exhibiting a pattern with a three-dimensional visual effect. [Solution] A light guide plate and a light source device including this light guide plate are provided. The light guide plate has a light incident surface and a first surface, the first surface has a plurality of virtual reference positioning lines extending along a first direction, and at least one optical microstructure set is arranged on the first surface corresponding to each virtual reference positioning line. Each optical microstructure set has a plurality of rod-shaped microstructures, and a portion of the rod-shaped microstructures along the plurality of virtual reference positioning lines on the first surface forms a pattern microstructure group. When the first surface is viewed from above, the perpendicular bisectors of the boundary lines that intersect each rod-shaped microstructure of the pattern microstructure group with the first surface all pass through the center point of the light-emitting surface of the light-emitting element in the light source.

Description

Technical Field

[0001] The present invention relates to an optical element and an optical device, and particularly to a light guide plate and a light source device.

Background Art

[0002] Current light source devices can be mainly divided into edge light type light source devices and direct bottom type light source devices. The edge light type light source device includes a light guide plate and a light source disposed on the light incident side of the light guide plate. The light guide plate guides the light emitted from the light source to the light emitting surface of the light guide plate, thereby emitting light. Generally speaking, a plurality of optical microstructures can be formed on the surface of the light guide plate to display a specific three-dimensional pattern, and a light source device having a pattern effect can be formed.

[0003] However, in the prior art, the pattern effect exhibited by a light source device having such a pattern display effect is limited to a planar one and cannot exhibit a three-dimensional visual effect.

[0004] The paragraph of "Background Art" is solely used for understanding the content of the present invention. Therefore, the content disclosed in the paragraph of "Background Art" may include content that does not constitute the prior art known to those skilled in the art. The content disclosed in the paragraph of "Background Art" does not indicate that one or more problems to be solved by one or more embodiments of the present invention were well-known or recognized by those skilled in the art before the filing of the present invention.

Summary of the Invention

Problems to be Solved by the Invention

[0005] The present invention provides a light guide plate and a light source device capable of presenting a pattern having a three-dimensional visual effect.

[0006] Other objects and advantages of the present invention can be further understood from the technical features disclosed in the present invention.

Means for Solving the Problems

[0007] To achieve one, part or all of the above objectives, an embodiment of the present invention provides a light guide plate. The light guide plate is adapted to guide a plurality of lights emitted from a light source. The light guide plate has a light incident surface and a first surface, the first surface being connected to the light incident surface, and the first surface having a plurality of virtual reference positioning lines extending along a first direction, the first direction being parallel to the light incident surface. On the first surface of the light guide plate, at least one set of optical microstructures is arranged corresponding to each virtual reference positioning line, each set of optical microstructures having a plurality of rod-shaped microstructures, each rod-shaped microstructure having an optical surface for guiding guided light, each optical surface intersecting the first surface on a boundary line, and a portion of the rod-shaped microstructures on the plurality of virtual reference positioning lines on the first surface forming a pattern microstructure group, and when the first surface is viewed from above, the perpendicular bisectors of the boundary lines of each rod-shaped microstructure in the pattern microstructure group all pass through the center point of the light-emitting surface of a light-emitting element in the light source, and the pattern microstructure group Some of the rod-shaped microstructures have optical surfaces that are not parallel to each other, and at each virtual reference positioning line, the number of sets of at least one optical microstructure set is determined based on the number of rod-shaped microstructures in the pattern microstructure group located on each virtual reference positioning line, the boundary line of any one rod-shaped microstructure in at least one optical microstructure set is parallel to the boundary line of one rod-shaped microstructure in the pattern microstructure group located on the same virtual reference positioning line, and the boundary lines of multiple rod-shaped microstructures in the same at least one optical microstructure set are parallel to each other.

[0008] To achieve one or all of the above objectives, or any other objectives, one embodiment of the present invention provides a light source device. The light source device includes a light source and a light guide plate. The light guide plate is adapted to guide a plurality of light emitted from the light source. The light guide plate has a light incident surface and a first surface, the first surface being connected to the light incident surface, and the first surface having a plurality of virtual reference positioning lines extending along a first direction, the first direction being parallel to the light incident surface. On the first surface of the light guide plate, at least one set of optical microstructures is arranged corresponding to each virtual reference positioning line, each set of optical microstructures having a plurality of rod-shaped microstructures, each rod-shaped microstructure having an optical surface for guiding guided light, each optical surface intersecting the first surface at a boundary line, and a portion of the rod-shaped microstructures along the plurality of virtual reference positioning lines on the first surface form a pattern microstructure group. When the first surface is viewed from above, the perpendicular bisectors of the boundary lines of each rod-shaped microstructure in the pattern microstructure group all pass through the center point of the light-emitting surface of the light-emitting element in the light source. In each virtual reference positioning line, the number of sets of at least one optical microstructure set is set based on the number of rod-shaped microstructures of the pattern microstructure group located on each virtual reference positioning line. The boundary line of any one rod-shaped microstructure in at least one optical microstructure set is parallel to the boundary line of one rod-shaped microstructure in the pattern microstructure group located on the same virtual reference positioning line, and the boundary lines of multiple rod-shaped microstructures in the same at least one optical microstructure set are parallel to each other.

[0009] In one embodiment of the present invention, the number of at least one optical microstructure set along each virtual reference positioning line of the light guide plate is equal to the number of rod-shaped microstructures of the pattern microstructure group located along each virtual reference positioning line.

[0010] In one embodiment of the present invention, if the number of rod-shaped microstructures in the pattern microstructure group is two or more in any one of the plurality of virtual reference positioning lines of the light guide plate, then rod-shaped microstructures of different sets in at least one optical microstructure set are arranged alternately along the first direction.

[0011] In one embodiment of the present invention, in any one of the plurality of virtual reference positioning lines of the light guide plate, the pattern microstructure group has a plurality of divided pattern microstructures on any one of the plurality of virtual reference positioning lines, the spacing between the plurality of divided pattern microstructures in the first direction is from half the length of the light-emitting surface of the light source to three times the length of the light-emitting surface of the light-emitting element of the light source, and in any one of the plurality of virtual reference positioning lines, the number of at least one optical microstructure set is equal to the number of divided pattern microstructures.

[0012] In one embodiment of the present invention, in each virtual reference positioning line of the light guide plate, the length in the first direction of the installation range of at least one optical microstructure set of rod-shaped microstructures is the same as the length in the first direction of the light incident surface.

[0013] In one embodiment of the present invention, the pattern microstructure group is divided into a plurality of mutually separated sub-pattern microstructure groups via a plurality of regions arranged in a first direction of the light guide plate, the range of each region being 1.5 times or more the size of each sub-pattern microstructure group, and the rod-shaped microstructures of at least one optical microstructure set of the same sub-pattern microstructure group are arranged within the same region.

[0014] In one embodiment of the present invention, the number of at least one optical microstructure set in each virtual reference positioning line in each region of the light guide plate is equal to the number of rod-shaped microstructures in the subpattern microstructure group.

[0015] In one embodiment of the present invention, if there are two or more rod-shaped microstructures to represent the same subpattern microstructure group in any one of the plurality of virtual reference positioning lines in each region of the light guide plate, then different sets of rod-shaped microstructures in at least one optical microstructure set are arranged alternately along the first direction in each region.

[0016] In one embodiment of the present invention, the region in which the above-mentioned pattern microstructure group is arranged is covered by the emission angle region of the light source.

[0017] In one embodiment of the present invention, the light source includes a plurality of sub-light sources, each sub-light source is arranged corresponding to a region, and each region is covered by the emission angle region of each sub-light source. [Effects of the Invention]

[0018] Based on the above, embodiments of the present invention have at least one of the following advantages or effects. In one embodiment of the present invention, the light guide plate and light source device can be used to exhibit a specific three-dimensional pattern having depth of field by designing the angle between the optical surface of the rod-shaped microstructures (i.e., the rod-shaped microstructures forming the pattern microstructure group) corresponding to each position of a specific three-dimensional pattern and the incident direction of light L.

[0019] To make the above-mentioned features and advantages of the present invention clearer and easier to understand, embodiments are described below and explained in detail with reference to the accompanying drawings. [Brief explanation of the drawing]

[0020] [Figure 1] This is a schematic diagram of the configuration of a light source device according to one embodiment of the present invention. [Figure 2A] Figure 1 is a schematic diagram showing the distribution of the optical microstructure set on the light guide plate of the light source device. [Figure 2B] Figure 2A is a schematic diagram showing the patterns of the light source device when viewed from different viewing angles. [Figure 2C] Figure 2A is a schematic diagram of the rod-shaped microstructure. [Figure 3] (A) is a schematic diagram showing the distribution of one pattern of the light source device in Figure 1 and the corresponding pattern microstructure group. (B) is a schematic diagram showing the distribution of each optical microstructure set in the light source device in (A). [Figure 4A] Figure 3 is a schematic diagram showing the patterns of the light source device when viewed from different viewing angles. [Figure 4B] Figure 3 is a schematic diagram showing the visual effects of the light source device when viewed from different viewing angles. [Figure 4C]It is a schematic diagram of the visual effect when the light source device of FIG. 3 is viewed from different viewing angles. [Figure 4D] It is a schematic diagram of the visual effect when the light source device of FIG. 3 is viewed from different viewing angles. [Figure 4E] It is a schematic diagram in which a plurality of light-emitting elements are arranged in the light source device of FIG. 3. [Figure 5] (A) is a schematic diagram of the distribution status of the pattern microstructure group corresponding to another pattern of the light source device of FIG. 1. (B) is a schematic diagram of the distribution status of each optical microstructure set of the light source device of (A). [Figure 6] (A) is a schematic diagram of the distribution status of the pattern microstructure group corresponding to another pattern of the light source device of FIG. 1. (B) is a schematic diagram of the distribution status of each optical microstructure set of the light source device of (A). [Figure 7] (A) is a schematic diagram of the distribution status of the pattern microstructure group corresponding to one pattern of the light source device of FIG. 1. (B) is a schematic diagram of the distribution status of each optical microstructure set of the light source device.

Embodiments for Carrying Out the Invention

[0021] The above-mentioned and other technical contents, features and effects of the present invention are clearly shown by the following detailed description of the preferred embodiments with reference to the drawings. The terms of directions such as up, down, left, right, front and back mentioned in the following embodiments are only for reference to the directions of the attached drawings. Therefore, the terms related to the directions used are exemplary and do not limit the present invention.

[0022] Figure 1 is a schematic diagram of the configuration of a light source device according to one embodiment of the present invention. Figure 2A is a schematic diagram of one distribution of the optical microstructure set on the light guide plate of the light source device of Figure 1. Figure 2B is a schematic diagram of the pattern of the light source device of Figure 2A when viewed from different viewing angles. Figure 2C is a schematic diagram of the structure of the rod-shaped microstructure of Figure 2A. Referring to Figure 1, the light source device 200 of this embodiment includes a light guide plate 100 and a light source 210, the light source 210 may include at least one light-emitting element LE. For example, as shown in Figure 2A, in this embodiment the light source 210 may be one light-emitting element LE adapted to provide a plurality of lights L, where the light-emitting element LE is, for example, a light-emitting diode (LED) element or other light-emitting element. For example, in this embodiment the light guide plate 100 is adapted to guide a plurality of lights L emitted from the light source 210, and the light guide plate 100 includes a plurality of rod-shaped microstructures MS that enable an observer to see a particular three-dimensional pattern having a stereoscopic effect. In the embodiment shown in Figure 2A, the specific three-dimensional patterns visible to the observer's left and right eyes are, for example, straight lines that create a stereoscopic visual effect. Thus, when the light source device 200 switches the light source 210 to an illuminated state, the light source device 200 can be used to present a specific three-dimensional pattern.

[0023] More specifically, as shown in Figure 1, the light guide plate 100 has a light incident surface SI and a first surface S1. The first surface S1 is connected to the light incident surface SI, and the rod-shaped microstructures MS are located on the first surface S1. For example, in this embodiment, the first surface S1 is, for example, the bottom surface of the light guide plate 100. That is, as shown in Figure 2A, in this embodiment, the multiple rod-shaped microstructures MS are located on the bottom surface of the light guide plate 100 (i.e., the side of the light guide plate 100 furthest from the observer).

[0024] Specifically, as shown in Figures 2A to 2C, in this embodiment, as shown in Figure 2C, the optical surface OS of the rod-shaped microstructure MS for guiding the light L is, for example, a plane, and reflects light L of the same incident angle and transmits it in the same direction. Furthermore, as shown in Figure 2A, when the rod-shaped microstructure MS and light L are orthogonal projected onto the first surface S1, if the incident direction of light L is perpendicular to the optical surface OS of the rod-shaped microstructure MS, the light L (after reflection by the rod-shaped microstructure MS) is emitted in the normal direction (a direction perpendicular to the first surface S1). On the other hand, if the incident direction of light L is not perpendicular to the optical surface OS of the rod-shaped microstructure MS, the light L (after reflection by the rod-shaped microstructure MS) is emitted in various different oblique directions depending on the incident angle of the light L.

[0025] Specifically, a portion of the rod-shaped microstructures MS arranged on the first surface S1 forms a pattern microstructure group PG, and the pattern microstructure group PG is arranged, for example, as a constituent pattern. The optical surface OS of each rod-shaped microstructure MS intersects the first surface S1 on the boundary line BS (see Figure 2C), and when the first surface S1 is viewed from above, the perpendicular bisectors of the boundary line BS of each rod-shaped microstructure MS in the pattern microstructure group PG all pass through the center point of the light-emitting surface LS of the same light-emitting element LE in the light source 210. That is, in this embodiment, as shown in Figure 2A, the three rod-shaped microstructures MS facing the light-emitting element LE constitute the pattern microstructure group PG. Furthermore, as shown in Figures 2A and 2B, since the pattern microstructure group PG in this embodiment is arranged as an extended straight line facing the light-emitting element LE, the boundary line BS of each rod-shaped microstructure MS in the pattern microstructure group PG is parallel to the light incident surface SI. Thus, when rod-shaped microstructures MS parallel to the light incident surface SI cover the light guide plate 100, an observer viewing the light source device 200 from a frontal viewing angle (perpendicular to the first surface S1) can observe light L emitted in the normal direction, as shown in the linear pattern PS in Figure 2B. On the other hand, when an observer views the light source device 200 from a non-frontal viewing angle, as shown in Figure 2A, only the rod-shaped microstructures MS located at positions that form a specific angle with the light L can reflect light to the human eye. Therefore, the observer can observe only light L emitted in the non-normal direction, as shown by the oblique linear pattern PI in Figure 2B. In other words, the image seen by the observer changes depending on the viewing angle. Furthermore, since there is a certain distance (approximately 65 millimeters) between the observer's left and right eyes, the actual field of view angles of the left and right eyes are slightly different. Therefore, as shown in Figure 2B, the images seen by the left and right eyes are similar but slightly different. For example, the difference becomes smaller as one approaches the light source 210, and vice versa. In reality, the left and right eyes each see straight lines with different inclination angles (for example, the straight line pattern PS and the diagonal straight line pattern PI in Figure 2B), and the gap between the two straight lines becomes smaller as one approaches the light source 210. The human brain then fuses the images seen by the left and right eyes to generate a stereoscopic visual effect (a specific three-dimensional pattern) with a depth of field that extends linearly within the light guide plate 100.In this embodiment, only one light-emitting element LE is arranged, and the light source 210 does not constitute a linear light source (a linear light source has, for example, light-emitting elements densely arranged along multiple light incident surfaces, and the gaps between light-emitting elements along the arrangement direction are, for example, less than 10 times the length of the light-emitting elements along the arrangement direction). Therefore, unlike a typical light source device with a linear light source, the observer can see a straight line that has a stereoscopic visual effect.

[0026] The following will further explain how the light source device 200 exhibits a stereoscopic visual effect with depth of field, with reference to Figures 3 to 4E.

[0027] Figure 3, (A) is a schematic diagram of the distribution of one pattern of the light source device in Figure 1 and the corresponding pattern microstructure group. (B) is a schematic diagram of the distribution of each optical microstructure set in the light source device in (A). Figure 4A is a schematic diagram of the pattern of the light source device in Figure 3 when viewed from a different viewing angle. Figures 4B to 4D are schematic diagrams of the visual effect of the light source device in Figure 3 when viewed from a different viewing angle, respectively.

[0028] As shown in Figures 1, 3(A), and 3(B), in this embodiment, the first surface S1 has a plurality of virtual reference positioning lines PL extending along a first direction D1, the first direction D1 is parallel to the light incident surface SI, and the normal direction of the light guide plate 100 (e.g., the first surface S1) is defined as the second direction D2. Specifically, in this embodiment, at least one optical microstructure set OG is arranged on the first surface S1 of the light guide plate 100, corresponding to each virtual reference positioning line PL1, PL2, and PL3. For example, optical microstructure set OG1 is arranged on virtual reference positioning line PL1, optical microstructure sets OG2a and OG2b are arranged on virtual reference positioning line PL2, and optical microstructure set OG3 is arranged on virtual reference positioning line PL3.

[0029] Each optical microstructure set OG has multiple rod-shaped microstructures MS, each rod-shaped microstructure MS has an optical surface OS for guiding light L, and each optical surface OS intersects the first surface S1 on a boundary line BS (see Figure 2C). Furthermore, as shown in Figure 3(A), in this embodiment, some of the rod-shaped microstructures MS arranged on multiple virtual reference positioning lines PL of the first surface S1 form a pattern microstructure group PG, and the pattern microstructure group PG is arranged, for example, in a circular shape (configuration pattern P). Specifically, as shown in Figure 3(A), in this embodiment, when the first surface S1 is viewed from above, the perpendicular bisectors of the boundary line BS of each rod-shaped microstructure MS of the pattern microstructure group PG all pass through the center point of the light-emitting surface LS of the same light-emitting element LE in the light source 210.

[0030] Furthermore, in this embodiment, the number of sets of at least one optical microstructure set OG on each virtual reference positioning line PL1, PL2, PL3 is set based on the number of rod-shaped microstructures MS of the pattern microstructure group PG located on each virtual reference positioning line PL1, PL2, PL3. For convenience of explanation, in this embodiment, the virtual reference positioning line PL1 is located, for example, at the uppermost end of the circle formed by the pattern microstructure group PG, the virtual reference positioning line PL2 is located, for example, in the middle of the circle formed by the pattern microstructure group PG, and the virtual reference positioning line PL3 is located, for example, at the lowermost end of the circle formed by the pattern microstructure group PG. For example, as shown in Figure 3(A), in this embodiment, the number of sets of at least one optical microstructure set OG on each virtual reference positioning line PL1, PL2, PL3 of the light guide plate 100 is equal to the number of rod-shaped microstructures MS of the pattern microstructure group PG located on each virtual reference positioning line PL1, PL2, PL3. For example, as shown in Figure 3(A), in this embodiment, since there is one rod-shaped microstructure MS in the pattern microstructure group PG arranged on the virtual reference positioning lines PL1 and PL3, the number of optical microstructure sets OG arranged on the virtual reference positioning lines PL1 and PL3 is one set each (i.e., optical microstructure set OG1 and optical microstructure set OG3). Since there are two rod-shaped microstructure MS in the pattern microstructure group PG arranged on the virtual reference positioning line PL2, the number of optical microstructure sets OG arranged on the virtual reference positioning line PL2 is two sets (i.e., optical microstructure sets OG2a and OG2b).

[0031] More specifically, in this embodiment, the region where the pattern microstructure group PG is arranged is covered by the emission angle region of the light-emitting element LE of the light source 210. Furthermore, since the positions of each rod-shaped microstructure MS in the pattern microstructure group PG are different, the angles between the optical surface OS and the light incident surface SI of the rod-shaped microstructure MS also differ accordingly. That is, the optical surfaces OS of some of the rod-shaped microstructure MS in the pattern microstructure group PG may not be parallel to each other. For example, as shown in Figure 3(A), the optical surfaces OS (boundary lines BS) of the rod-shaped microstructure MS in optical microstructure sets OG2a and OG2b are not parallel to each other.

[0032] Furthermore, as shown in Figure 3(B), in this embodiment, the multiple rod-shaped microstructures MS of each optical microstructure set OG on the light guide plate 100 are positioned on corresponding reference positioning lines PL, and the entire light guide plate 100 is covered along the corresponding reference positioning lines PL. That is, on each of the virtual reference positioning lines PL1, PL2, PL3, the length in the first direction D1 of the installation range of the rod-shaped microstructure MS of at least one optical microstructure set OG on the light guide plate 100 is the same as the length in the first direction D1 of the light incident surface SI. Furthermore, in this embodiment, the optical surfaces OS of the multiple rod-shaped microstructures MS of the same optical microstructure set OG are parallel to each other. That is, the optical surface OS of any of the rod-shaped microstructure MS of at least one optical microstructure set OG is parallel to the optical surface OS of one rod-shaped microstructure MS of the pattern microstructure group PG on the same virtual reference positioning line PL (i.e., the rod-shaped microstructure MS of the pattern microstructure group PG may also be a rod-shaped microstructure MS in at least one optical microstructure set OG). In other words, each optical microstructure set OG includes one rod-shaped microstructure MS from the pattern microstructure group PG. Furthermore, as shown in Figure 3(B), in this embodiment, if the number of rod-shaped microstructure MS of the pattern microstructure group PG is two or more in any one of the multiple virtual reference positioning lines PL on the light guide plate 100, then rod-shaped microstructure MS of different sets in at least one optical microstructure set OG are arranged alternately along the first direction D1. That is, as shown in Figure 3(B), in this embodiment, the rod-shaped microstructure MS of optical microstructure set OG2A and the rod-shaped microstructure MS of optical microstructure set OG2b are arranged alternately along the first direction D1.

[0033] Thus, as shown in Figure 4A, by arranging the rod-shaped microstructure MS of the pattern microstructure group PG and the corresponding optical microstructure set OG on the light guide plate 100 and designing the angle between the optical surface OS and the light incident surface SI, light L can be reflected by the rod-shaped microstructure MS and, after leaving the light guide plate 100, exhibit a predetermined specific pattern. Furthermore, different specific patterns can be seen from different viewing angles. Moreover, because there is a gap between the human eye, overlapping patterns can be seen, and a specific three-dimensional pattern with a stereoscopic visual effect (depth of field) can be seen. Also, as shown in Figures 4B to 4D, when an observer views the light source device 200 from different viewing angles, the pattern effect of the light image (specific pattern) seen by the observer changes according to the different viewing angles, and the depth of field effect becomes even deeper.

[0034] Furthermore, Figure 4E is a schematic diagram showing the light source device of Figure 3 with multiple light-emitting elements arranged on it. As shown in Figure 4E, in another embodiment, the number of light-emitting elements LE in the light source 210 is two, and other rod-shaped microstructures MS parallel to each other are also distributed on the light guide plate 100, so that each light-emitting element LE at a different position has substantially a corresponding rod-shaped microstructure MS of the pattern microstructure group PG. As a result, when the light source 210 is lit, it can exhibit different configuration patterns P. In other words, when the light source 210 lights up multiple light-emitting elements LE, the light source device 200' can be used to display multiple specific three-dimensional patterns with depth of field.

[0035] Figure 5, (A) is a schematic diagram of the distribution of pattern microstructure groups corresponding to another pattern of the light source device in Figure 1. (B) is a schematic diagram of the distribution of each optical microstructure set of the light source device in (A). Referring to Figures 5(A) and 5(B), the light guide plate 500 and light source device 600 of this embodiment are similar to the light guide plate 100 and light source device 200 in Figures 3(A) and 3(B), with the differences being as follows. In this embodiment, the constituent patterns P formed by the pattern microstructure group PG are not limited to being connected. As shown in Figure 5(A), the constituent patterns P can be arranged on the light guide plate 500 as sub-constituent patterns SP1, SP2, and the number of rod-shaped microstructures MS of the pattern microstructure group PG arranged on any one of the multiple virtual reference positioning lines PL of the light guide plate 100 is finite. For example, as shown in Figures 5(A) and 5(B), in this embodiment, the number of rod-shaped microstructures MS in the pattern microstructure group PG is 4 on the virtual reference positioning line PL.

[0036] Thus, if the fineness of the pattern is not considered, in this embodiment, the number of optical microstructure sets OG can still be designed according to the virtual reference positioning line PL and the multiple sub-configuration patterns SP1, SP2, and the rod-shaped microstructures MS of different sets are arranged alternately along the first direction D1. For example, as shown in Figures 5(A) and 5(B), in this embodiment, the number of optical microstructure sets OG arranged on the virtual reference positioning line PL is four sets (i.e., optical microstructure sets OGa, OGb, OGc, OGd), and the rod-shaped microstructures MS of optical microstructure set OGA, optical microstructure set OGb, optical microstructure set OGc, and optical microstructure set OGd are arranged alternately along the first direction D1.

[0037] Thus, as shown in Figure 5(A), by designing the angle of the optical surface OS of the rod-shaped microstructure MS (i.e., the rod-shaped microstructure MS that form the pattern microstructure group PG) corresponding to each position of the multiple sub-configuration patterns SP1 and SP2, the light L can still exhibit a specific three-dimensional pattern with depth of field after leaving the light guide plate 500. In this way, the arrangement of the rod-shaped microstructure MS and optical microstructure set that form the pattern microstructure group PG allows the light guide plate 500 and light source device 600 to achieve the same effects and advantages as the light guide plate 100 and light source device 200, so a further explanation is omitted here.

[0038] Figure 6, (A) is a schematic diagram of the distribution of pattern microstructures corresponding to another pattern of the light source device in Figure 1. (B) is a schematic diagram of the distribution of each optical microstructure set of the light source device in (A). Referring to Figures 6(A) and 6(B), the light guide plate 700 and light source device 800 of this embodiment are similar to the light guide plate 500 and light source device 600 in Figures 5(A) and 5(B), and the differences between the two are as follows. In this embodiment, the pattern microstructure group PG is divided into a plurality of mutually separated sub-pattern microstructure groups PG1 and PG2 via a plurality of regions arranged in a first direction D1 of the light guide plate 100, with the range of each region R1 and R2 being at least 1.5 times the range of each sub-pattern microstructure group PG1 and PG2, the rod-shaped microstructure MS of at least one optical microstructure set OG corresponding to sub-pattern microstructure group PG1 being provided only within region R1, and the rod-shaped microstructure MS of at least one optical microstructure set OG corresponding to sub-pattern microstructure group PG2 being provided only within region R2. Furthermore, the light source 210 includes a plurality of sub-light sources 210S, each sub-light source 210S is arranged corresponding to each region R1 and R2, each region R1 and R2 is covered by the emission angle region of each sub-light source 210S, and the number of sub-pattern microstructure groups is the same as the number of sub-light sources. In this embodiment, the number of sub-pattern microstructure groups is two, but the present invention is not limited thereto, and in other embodiments, the number of sub-pattern microstructure groups may be more than two. Furthermore, in this embodiment, in each virtual reference positioning line PL of each region R1 and R2, the number of sets of at least one optical microstructure set OG in the light guide plate 100 is equal to the number of rod-shaped microstructures MS of the sub-pattern microstructure groups PG1 and PG2. In any one of the multiple virtual reference positioning lines PL of each region R1 and R2, the number of rod-shaped microstructures MS to exhibit the same sub-pattern microstructure groups PG1 and PG2 in the light guide plate 100 is two or more, in which case the rod-shaped microstructures MS of different sets in at least one optical microstructure set OG are arranged alternately along the first direction D1 in each region.

[0039] For example, as shown in Figure 6(B), in this embodiment, in region R1, there are two sets of optical microstructure sets OG (i.e., optical microstructure sets OGa and OGb) that are positioned on the virtual reference positioning line PL to exhibit the subpattern microstructure group PG1, and the rod-shaped microstructures MS of optical microstructure set OGA and optical microstructure set OGb are arranged alternately along the first direction D1. Similarly, in region R2, there are two sets of optical microstructure sets OG (i.e., optical microstructure sets OGc and OGd) that are positioned on the virtual reference positioning line PL to exhibit the subpattern microstructure group PG2, and the rod-shaped microstructures MS of optical microstructure set OGc and optical microstructure set OGd are arranged alternately along the first direction D1.

[0040] As shown in Figures 6(A) and 6(B), the sub-pattern microstructure groups PG1 and PG2 are distributed in different regions R1 and R2 on the light guide plate 100. Therefore, the arrangement of the rod-shaped microstructure MS in the optical microstructure set corresponding to sub-pattern microstructure group PG1 and the optical microstructure set corresponding to sub-pattern microstructure group PG2 does not affect each other, and the fineness of the pattern can be further ensured. Furthermore, the light guide plate 700 and the light source device 800 can achieve the same effects and advantages as in the above embodiments by using the arrangement methods of each embodiment, so a further explanation is omitted here.

[0041] Figure 7(A) is a schematic diagram of the distribution of a pattern microstructure group corresponding to one pattern of the light source device 200 in Figure 1. Figure 7(B) is a schematic diagram of the distribution of each optical microstructure set of the light source device in (A). Referring to Figures 7(A) and 7(B), the light guide plate 900 and light source device 1000 of this embodiment are similar to the light guide plate 100 and light source device 200 in Figures 3(A) and 3(B), with the differences being as follows. In this embodiment, a specific three-dimensional pattern is a horizontal linear pattern, that is, a specific pattern observed by the human eye is parallel to the first direction D1. Thus, in order to avoid the excessive arrangement of rod-shaped microstructures MS of the pattern microstructure group PG on the same virtual reference positioning line PL, in this embodiment, the pattern microstructure group PG has multiple divided pattern microstructures on one of the multiple virtual reference positioning lines PL, and the multiple divided pattern microstructures are located at the center points of the multiple divided patterns. In other words, the gap P1 between multiple segmented pattern microstructures along the first direction D1 ranges from half the length LW of the light-emitting surface LS of the light source 210 to three times the length LW of the light-emitting surface LS of the light-emitting element LE of the light source 210. In any one of the multiple virtual reference positioning lines PL, the number of sets of at least one optical microstructure set OG is equal to the number of multiple segmented pattern microstructures, and different sets of rod-shaped microstructures MS are arranged alternately along the first direction D1. The gap between adjacent rod-shaped microstructures MS on the same virtual reference positioning line PL is smaller than the gap P1.

[0042] For example, as shown in Figures 7(A) and 7(B), in this embodiment, the number of optical microstructure sets OG arranged on the virtual reference positioning line PL is three (i.e., optical microstructure sets OGa, OGb, and OGc), and the rod-shaped microstructures MS of optical microstructure set OGA, optical microstructure set OGb, and optical microstructure set OGd are arranged alternately along the first direction D1.

[0043] Thus, as shown in Figures 7(A) and 7(B), the arrangement of the light guide plate 900 and the light source device 1000 allows the light L to still exhibit a specific three-dimensional pattern with depth of field after leaving the light guide plate 700 via the rod-shaped microstructure MS. In this way, the arrangement of the rod-shaped microstructure MS allows the light guide plate 900 and the light source device 1000 to achieve the same effects and advantages as the light guide plate 100 and the light source device 200, so a further explanation is omitted here.

[0044] In summary, embodiments of the present invention have at least one of the following advantages or effects. In one embodiment of the present invention, the light guide plate and light source device can be used to exhibit a specific three-dimensional pattern having depth of field by designing the angle between the optical surface of the rod-shaped microstructures at each position of the corresponding specific pattern (i.e., the rod-shaped microstructures forming the pattern microstructure group) and the incident direction of light L.

[0045] As disclosed above, these are merely preferred embodiments of the present invention and should not be used to limit the scope of the invention. In other words, simple equivalent changes and modifications made based on the patentable scope and description of the invention remain within the scope covered by the patent of the present invention. Furthermore, no embodiment or patentable scope of the present invention is required to achieve all the purposes, advantages, or features disclosed herein. Also, the abstract and title of the invention are used solely to assist in the search of patent documents and are not intended to limit the scope of the invention. Furthermore, terms such as “first” and “second” used herein or in the claims are used solely to name elements or to distinguish different embodiments or scopes and are not intended to limit the number of components. [Industrial applicability]

[0046] The light guide plate and light source device of the present invention can be applied to the field of optical elements and optical devices. [Explanation of Symbols]

[0047] 100, 500, 700, 900: Light guide plate 200, 200', 600, 800, 1000: Light source device 210: Light source 210S: Sub-light source BS: borderline D1: 1st direction D2:Second direction L:Light L1, LW: Length LE: Light-emitting element LS: Illuminating surface MS: rod-like microstructure OG, OG1, OG2a, OG2b, OG3, OGa, OGb, OGc, OGd Optical Microstructure Set OS: Optical surface P: Configuration Pattern P1: Gap PL, PL1, PL2, PL3: Virtual reference positioning lines PS: Straight line pattern PI: Diagonal line pattern S1: 1st page SI: Light incidence surface SP: Split Pattern SP1, SP2: Sub-configuration patterns PG: Patterned microstructure group PG1, PG2: Subpattern microstructure group R1, R2: area

Claims

1. A light guide plate adapted to guide multiple beams of light emitted from a light source, The light guide plate has a front light incident surface and a first surface, The first surface is connected to the light incident surface, The first surface has a plurality of virtual reference positioning lines extending along the first direction, The first direction is parallel to the light incident plane, On the first surface of the light guide plate, at least one set of optical microstructures is arranged corresponding to each of the plurality of virtual reference positioning lines. Each of the above at least one optical microstructure sets has a plurality of rod-shaped microstructures, Each of the rod-shaped microstructures has an optical surface for guiding the light. Each of the optical surfaces intersects the first surface at the boundary line, A portion of the rod-shaped microstructures in the plurality of virtual reference positioning lines on the first surface forms a pattern microstructure group. When the first surface is viewed from above, the perpendicular bisectors of the boundary lines of each of the rod-shaped microstructures in the pattern microstructure group all pass through the center point of the light-emitting surface of the light-emitting element in the light source. The optical surfaces of some of the rod-shaped microstructures in the aforementioned pattern microstructure group are not parallel to each other. In each of the plurality of virtual reference positioning lines, the number of sets of at least one optical microstructure set is determined based on the number of rod-shaped microstructures of the pattern microstructure group located on each of the plurality of virtual reference positioning lines. The boundary line of any one of the rod-shaped microstructures in the set of at least one optical microstructure is parallel to the boundary line of one of the rod-shaped microstructures in the group of pattern microstructures located on the same set of virtual reference lines. The boundaries of the plurality of rod-shaped microstructures of the same set of at least one optical microstructure are parallel to each other. light guide plate.

2. In each of the plurality of virtual reference positioning lines, the number of at least one optical microstructure set is equal to the number of rod-shaped microstructures of the pattern microstructure group located on each of the plurality of virtual reference positioning lines. The light guide plate according to claim 1.

3. If, in any one of the plurality of virtual reference positioning lines, the number of rod-shaped microstructures in the pattern microstructure group is two or more, then the rod-shaped microstructures of different sets in the at least one optical microstructure set are arranged alternately along the first direction. The light guide plate according to claim 1.

4. In any one of the plurality of virtual reference positioning lines, the pattern microstructure group has a plurality of divided pattern microstructures on any one of the plurality of virtual reference positioning lines, and the spacing of the plurality of divided pattern microstructures in the first direction is from half the length of the light-emitting surface of the light source to three times the length of the light-emitting surface of the light-emitting element of the light source. In any one of the plurality of virtual reference positioning lines, the number of at least one optical microstructure set is equal to the number of the plurality of divided pattern microstructures. The light guide plate according to claim 1.

5. In each of the plurality of virtual reference positioning lines, the length of the installation range of the rod-shaped microstructure of the at least one optical microstructure set in the first direction is the same as the length in the first direction of the light incident surface. The light guide plate according to claim 1.

6. The pattern microstructure group is divided into a plurality of mutually separated sub-pattern microstructure groups via a plurality of regions arranged in the first direction of the light guide plate, the range of each region being 1.5 times or more the size of each sub-pattern microstructure group, and the rod-shaped microstructures of at least one optical microstructure set of the same sub-pattern microstructure group are arranged within the same region. The light guide plate according to claim 1.

7. In each of the plurality of virtual reference positioning lines in each of the regions, the number of at least one optical microstructure set is equal to the number of rod-shaped microstructures in the subpattern microstructure group. The light guide plate according to claim 6.

8. If, in any one of the plurality of virtual reference positioning lines in each of the regions, the number of rod-shaped microstructures representing the same subpattern microstructure group is two or more, then the rod-shaped microstructures of different sets in the at least one optical microstructure set are arranged alternately along the first direction in each of the regions. The light guide plate according to claim 6.

9. A light source having at least one light-emitting element and adapted to provide multiple lights, A light guide plate having a light incident surface and a first surface, the first surface being connected to the light incident surface and having a plurality of virtual reference positioning lines extending along a first direction, the first direction being parallel to the light incident surface, The light guide plate includes, On the first surface, at least one set of optical microstructures is arranged corresponding to each of the plurality of virtual reference positioning lines, each of the at least one set of optical microstructures has a plurality of rod-shaped microstructures, each of the rod-shaped microstructures has an optical surface for guiding the light, and each of the optical surfaces intersects the first surface at a boundary line, A portion of the rod-shaped microstructures along the plurality of virtual reference positioning lines on the first surface forms a pattern microstructure group, and when the first surface is viewed from above, the perpendicular bisectors of the boundary lines of each rod-shaped microstructure in the pattern microstructure group all pass through the center point of the light-emitting surface of the light-emitting element in the light source. In each of the plurality of virtual reference positioning lines, the number of sets of the at least one optical microstructure set is set based on the number of rod-shaped microstructures of the pattern microstructure group located on each of the plurality of virtual reference positioning lines, the boundary line of any one of the rod-shaped microstructures of the at least one optical microstructure set is parallel to the boundary line of one of the rod-shaped microstructures of the pattern microstructure group located on the same plurality of virtual reference positioning lines, and the boundary lines of the plurality of rod-shaped microstructures of the same at least one optical microstructure set are parallel to each other. Light source device.

10. The region where the aforementioned pattern microstructures are arranged is covered by the emission angle region of the light source. The light source device according to claim 9.

11. The pattern microstructure group is divided into a plurality of mutually separated sub-pattern microstructure groups via a plurality of regions arranged in the first direction of the light guide plate, the range of each region being 1.5 times or more the size of each sub-pattern microstructure group, and the rod-shaped microstructures of at least one optical microstructure set of the same sub-pattern microstructure group are arranged within the same region. The light source device according to claim 9.

12. The light source includes a plurality of sub-light sources, each of which is arranged in accordance with each of the regions, and each of the regions is covered by the emission angle region of each of the sub-light sources. The light source device according to claim 11.

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