Light guide plate and light source module

Abstract

The invention provides a light guide plate and a light source module. The light guide plate comprises a light incident surface, a first surface and a plurality of optical microstructures. The first surface is connected with the incident surface. The plurality of optical microstructures is disposed on the first surface. Each optical microstructure has a first cross-sectional profile along the first cross-section and a second cross-sectional profile along the second cross-section. The first cross section is perpendicular to the second cross section. The first cross-sectional profile is different than the second cross-sectional profile. The plurality of optical microstructures include a plurality of first optical microstructures and a plurality of second optical microstructures, and the second cross-sectional profile of each first optical microstructure is different from the second cross-sectional profile of each second optical microstructure.

Description

Technical Field

[0001] The invention relates to a light source module, and in particular to a light source module with a light guide plate. Background Art

[0002] With the increasing use of non-self-luminous displays such as liquid crystal displays, the design of backlight modules also needs to be adjusted for different usage scenarios. Among them, edge-entry backlight modules have become the mainstream in the market because they can meet the thinning requirements of displays. Generally speaking, edge-entry backlight modules include a light guide plate and a light source. The light source is arranged on the edge surface of one side of the light guide plate to effectively reduce the thickness of the backlight module. However, such a design may cause uneven light distribution (such as light spot phenomenon) due to the discontinuous distribution of the light source with power-saving characteristics on one edge of the light guide plate. Summary of the invention

[0003] The present invention is directed to a light guide plate and a light source module, which have better uniformity of light distribution.

[0004] According to an embodiment of the present invention, a light guide plate includes a light incident surface, a first surface and a plurality of optical microstructures. The first surface is connected to the light incident surface. A plurality of optical microstructures are arranged on the first surface. Each optical microstructure has a first cross-sectional profile along a first cross-sectional profile and a second cross-sectional profile along a second cross-sectional profile. The first cross-sectional profile is perpendicular to the second cross-sectional profile. The first cross-sectional profile is different from the second cross-sectional profile. The plurality of optical microstructures include a plurality of first optical microstructures and a plurality of second optical microstructures, and the second cross-sectional profile of each first optical microstructure is different from the second cross-sectional profile of each second optical microstructure.

[0005] According to an embodiment of the present invention, a light source module includes a light guide plate and a light source. The light guide plate includes a light incident surface, a first surface and a plurality of optical microstructures. The first surface is connected to the light incident surface. A plurality of optical microstructures are arranged on the first surface. Each optical microstructure has a first cross-sectional profile along a first cross-sectional profile and a second cross-sectional profile along a second cross-sectional profile. The first cross-sectional profile is perpendicular to the second cross-sectional profile. The first cross-sectional profile is different from the second cross-sectional profile. The plurality of optical microstructures include a plurality of first optical microstructures and a plurality of second optical microstructures, and the second cross-sectional profile of each first optical microstructure is different from the second cross-sectional profile of each second optical microstructure. The light source is arranged on one side of the light incident surface of the light guide plate.

[0006] Based on the above, in a light source module of an embodiment of the present invention, each optical microstructure disposed on the first surface of the light guide plate is asymmetric relative to a cross section parallel to the light incident surface of the light guide plate. The cross-sectional profile of a portion of the optical microstructures along a cross section is different from the cross-sectional profile of another portion of the optical microstructures along the cross section. Accordingly, the uniformity of the light output distribution of the light guide plate can be effectively improved.

[0007] In order to make the above content clearer and easier to understand, several embodiments are described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 is a bottom view schematic diagram of a light source module according to an embodiment of the present invention;

[0009] Figure 2A and Figure 2B yes Figure 1 A cross-sectional schematic diagram of a light source module;

[0010] Figure 3 is a bottom view schematic diagram of a light source module according to another embodiment of the present invention;

[0011] Figure 4 FIG. 4 is a bottom view of a light source module according to another embodiment of the present invention.

[0012] Description of Reference Numerals

[0013] 10, 10A, 10B: light source module;

[0014] 100, 100A, 100B: light guide plate;

[0015] 100is: light incident surface;

[0016] 100bs: first surface;

[0017] 100es: second surface;

[0018] 120: light source;

[0019] CS1: first cross section;

[0020] CS2: second cross section;

[0021] CSP1a, CSP1b, CSP1c: first cross-sectional profile;

[0022] CSP2a, CSP2b, CSP2c: second cross-sectional profile;

[0023] D1, D2, D3: direction;

[0024] MS1, MS2, MS3: optical microstructures;

[0025] SP1, SP2, SP3: symmetry planes;

[0026] A-A', B-B': section line;

[0027] φ1, φ2, θ1, θ2: angle. DETAILED DESCRIPTION

[0028] Reference will now be made in detail to exemplary embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Whenever possible, the same reference numerals are used in the drawings and the description to refer to the same or like parts.

[0029] Figure 1 is a bottom view of a light source module according to an embodiment of the present invention. Figure 2A and Figure 2B yes Figure 1 A cross-sectional schematic diagram of a light source module. Figure 2A Corresponds to Figure 1 The three section lines A-A' in. Figure 2B Corresponds to Figure 1 It should be noted that the orthographic projection of the first cross section CS1 of each optical microstructure on the first surface 100bs is defined as the cross section AA'. Similarly, the orthographic projection of the second cross section CS2 of each optical microstructure on the first surface 100bs is defined as the cross section BB'.

[0030] Please refer to Figure 1 , Figure 2A and Figure 2B , the light source module 10 includes a light guide plate 100 and a light source 120. The light guide plate 100 has a light incident surface 100is, a first surface 100bs and a second surface 100es. The second surface 100es and the first surface 100bs are opposite to each other and connected to the light incident surface 100is. The light source 120 is disposed on one side of the light incident surface 100is of the light guide plate 100. The light source 120 may include a plurality of light emitting diodes arranged at intervals along a direction parallel to the light incident surface 100is and the first surface 100bs, but is not limited thereto.

[0031] The light guide plate 100 also has a plurality of optical microstructures disposed on the first surface 100bs of the light guide plate 100. These optical microstructures are configured to deflect a light beam (not shown) emitted by the light source 120 and transmitted within the light guide plate 100 to the second surface 100es. It is particularly noted that each optical microstructure has an asymmetric structure. More specifically, each optical microstructure has two different cross-sectional profiles along two cross sections perpendicular to each other. In this embodiment, the asymmetric structures of these optical microstructures may be the same but arranged differently.

[0032] From another point of view, each optical microstructure may have a first cross-sectional profile along the first cross-sectional profile CS1 and a second cross-sectional profile along the second cross-sectional profile CS2. The first cross-sectional profile CS1 is perpendicular to the second cross-sectional profile CS2. The first cross-sectional profile CS1 intersects the light incident surface 100is. For example, in the present embodiment, the first cross-sectional profile CS1 may be perpendicular to the light incident surface 100is. At least two portions of these optical microstructures have different first cross-sectional profiles or different second cross-sectional profiles.

[0033] For example, in the present embodiment, the optical microstructures may include a plurality of optical microstructures MS1, a plurality of optical microstructures MS2, and a plurality of optical microstructures MS3. Each optical microstructure MS1 has only one symmetry plane SP1 that coincides with the first cross section CS1, that is, the symmetry plane SP1 of each optical microstructure MS1 is perpendicular to the light incident surface 100is. Each optical microstructure MS2 has only one symmetry plane SP2, and the symmetry plane SP2 is rotated counterclockwise by an angle φ2 relative to the first cross section CS1. Similarly, each optical microstructure MS3 has only one symmetry plane SP3, and the symmetry plane SP3 is rotated clockwise by an angle φ1 relative to the first cross section CS1.

[0034] From another perspective, the second cross-sectional profile CSP2a of each optical microstructure MS1, the second cross-sectional profile CSP2b of each optical microstructure MS2, and the second cross-sectional profile CSP2c of each optical microstructure MS3 are all different from each other. The first cross-sectional profile CSP1a of each optical microstructure MS1 is different from the first cross-sectional profile CSP1b of each optical microstructure MS2 and the first cross-sectional profile CSP1c of each optical microstructure MS3.

[0035] In the present embodiment, the first cross-sectional profile CSP1b of each optical microstructure MS2 may be the same as the first cross-sectional profile CSP1c of each optical microstructure MS3, that is, the rotation angle φ2 of each optical microstructure MS2 may be the same as the rotation angle φ1 of each optical microstructure MS3, but the present invention is not limited thereto. In another embodiment, the rotation angle φ2 of each optical microstructure MS2 may be different from the rotation angle φ1 of each optical microstructure MS3, that is, the first cross-sectional profile CSP1b of each optical microstructure MS2 may be different from the first cross-sectional profile CSP1c of each optical microstructure MS3.

[0036] It should be noted that Figure 2A and Figure 2B The linear shape of the cross-sectional profile in the figure is for exemplary purposes only and the present invention is not limited thereto.

[0037] By configuring the optical microstructures MS1, MS2 and MS3, the uniformity of light distribution of the light guide plate 100 can be effectively improved. In particular, the light spot phenomenon mainly occurring near the side of the light guide plate 100 where the light source 120 is disposed can be alleviated.

[0038] Other embodiments will be listed below to illustrate the present disclosure in detail, wherein the same components will be marked with the same symbols, and the description of the same technical content will be omitted. For the omitted parts, please refer to the aforementioned embodiments, which will not be repeated below.

[0039] Figure 3 is a bottom view of a light source module according to another embodiment of the present invention. Figure 3 The light source module 10A of this embodiment is Figure 1 The difference between the light source modules 10 is that the arrangement of the optical microstructures is different.

[0040] Different from Figure 1 In the embodiment, the optical microstructures are randomly arranged in the optical microstructures. The multiple optical microstructures of the embodiment can be arranged along at least one direction. For example, in the embodiment, the multiple optical microstructures MS2 can be arranged along the direction D2, and the multiple optical microstructures MS3 can be arranged along the direction D1. It is worth mentioning that the direction D1 and the direction D2 are not perpendicular to and parallel to the light incident surface 100is, and the direction D1 intersects with the direction D2.

[0041] More specifically, the arrangement direction of the plurality of optical microstructures MS2 (i.e., direction D2) is rotated counterclockwise by an angle θ2 relative to the normal direction of the light incident surface 100is, and the arrangement direction of the plurality of optical microstructures MS3 (i.e., direction D1) is rotated clockwise by an angle θ1 relative to the normal direction of the light incident surface 100is. In this embodiment, the angle θ1 may be different from the angle θ2, but the present invention is not limited thereto. In another embodiment, the angle θ1 may be the same as the angle θ2.

[0042] In this embodiment, the symmetry plane (eg Figure 1 The symmetry plane SP2 shown in FIG. 1 may be parallel to the direction D2, and the symmetry plane of each optical microstructure MS3 (eg Figure 1 The symmetry plane SP3 shown may be parallel to the direction D1. However, the present invention is not limited thereto. In another embodiment, the symmetry plane of each optical microstructure MS2 may intersect in the direction D2, and the symmetry plane of each optical microstructure MS3 may intersect in the direction D1.

[0043] By configuring the optical microstructures MS2 and MS3, the uniformity of light distribution of the light guide plate 100A can be effectively improved. In particular, the light spot phenomenon mainly occurring near the side of the light guide plate 100A where the light source 120 is disposed can be alleviated.

[0044] Figure 4 FIG. 1 is a bottom view of a light source module according to another embodiment of the present invention. Figure 4 The light source module 10B of this embodiment is Figure 1 The difference between the light source module 10 and the light source module 10 is that the arrangement of the optical microstructures is different. Specifically, the distribution density of the optical microstructures on the first surface 100bs increases along the direction away from the light incident surface 100is (for example, direction D3). Figure 1 With the light source module 10, the uniformity of light distribution of the light guide plate 100B can be further improved.

[0045] Since the orientations of the optical microstructures MS1, MS2 and MS3 of the present embodiment are similar to Figure 1 For the detailed description of the optical microstructure MS1, the optical microstructure MS2 and the optical microstructure MS3, please refer to the relevant paragraphs of the aforementioned embodiments, which will not be repeated here.

[0046] In summary, in a light source module of an embodiment of the present invention, each optical microstructure disposed on the first surface of the light guide plate is asymmetric relative to a cross section parallel to the light incident surface of the light guide plate. The cross-sectional profile of a portion of the optical microstructures along a cross section is different from the cross-sectional profile of another portion of the optical microstructures along the cross section. Accordingly, the uniformity of the light output distribution of the light guide plate can be effectively improved.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A light guide plate, characterized in that: include: Light-entering surface; A first surface connected to the light incident surface; as well as A plurality of optical microstructures are disposed on the first surface, wherein each of the plurality of optical microstructures has a first cross-sectional profile along a first cross-sectional profile and a second cross-sectional profile along a second cross-sectional profile, the first cross-sectional profile is perpendicular to the second cross-sectional profile, the first cross-sectional profile is different from the second cross-sectional profile, the plurality of optical microstructures include a plurality of first optical microstructures and a plurality of second optical microstructures, and the second cross-sectional profile of each of the plurality of first optical microstructures is different from the second cross-sectional profile of each of the plurality of second optical microstructures.

2. The light guide plate according to claim 1, characterized in that: The first cross-sectional profile of each of the plurality of first optical microstructures is different from the first cross-sectional profile of each of the plurality of second optical microstructures.

3. The light guide plate according to claim 1, characterized in that: The plurality of optical microstructures further include a plurality of third optical microstructures, and the second cross-sectional profile of each of the plurality of third optical microstructures is different from the second cross-sectional profile of each of the plurality of first optical microstructures and the plurality of second optical microstructures.

4. The light guide plate according to claim 3, characterized in that: The first cross-sectional profile of each of the second optical microstructures is the same as the first cross-sectional profile of each of the third optical microstructures.

5. The light guide plate according to claim 4, characterized in that: The first cross-sectional profile of each of the plurality of first optical microstructures is different from the first cross-sectional profile of each of the plurality of second optical microstructures.

6. The light guide plate according to claim 1, characterized in that: The plurality of first optical microstructures are arranged along a first direction, and the first direction is not perpendicular to the light incident surface.

7. The light guide plate according to claim 6, characterized in that: The plurality of second optical microstructures are arranged along a second direction, the second direction is not perpendicular to the light incident surface, and the second direction intersects with the first direction.

8. The light guide plate according to claim 7, characterized in that: The first direction and the second direction are not parallel to the light incident surface.

9. The light guide plate according to claim 1, characterized in that: The distribution density of the plurality of optical microstructures on the first surface increases along a direction away from the light incident surface.

10. A light source module, characterized in that: include: Light guide plate, comprising: Light-entering surface; A first surface connected to the light incident surface; and a plurality of optical microstructures disposed on the first surface, wherein each of the plurality of optical microstructures has a first cross-sectional profile along a first cross-sectional profile and a second cross-sectional profile along a second cross-sectional profile, the first cross-sectional profile is perpendicular to the second cross-sectional profile, the first cross-sectional profile is different from the second cross-sectional profile, the plurality of optical microstructures include a plurality of first optical microstructures and a plurality of second optical microstructures, and the second cross-sectional profile of each of the plurality of first optical microstructures is different from the second cross-sectional profile of each of the plurality of second optical microstructures; and The light source is arranged on one side of the light incident surface of the light guide plate.

11. The light source module according to claim 10, characterized in that: The first cross-sectional profile of each of the plurality of first optical microstructures is different from the first cross-sectional profile of each of the plurality of second optical microstructures.

12. The light source module according to claim 10, characterized in that: The plurality of optical microstructures further include a plurality of third optical microstructures, and the second cross-sectional profile of each of the plurality of third optical microstructures is different from the second cross-sectional profile of each of the plurality of first optical microstructures and the plurality of second optical microstructures.

13. The light source module according to claim 12, characterized in that: The first cross-sectional profile of each of the second optical microstructures is the same as the first cross-sectional profile of each of the third optical microstructures.

14. The light source module according to claim 13, characterized in that: The first cross-sectional profile of each of the plurality of first optical microstructures is different from the first cross-sectional profile of each of the plurality of second optical microstructures.

15. The light source module according to claim 10, characterized in that: The plurality of first optical microstructures are arranged along a first direction, and the first direction is not perpendicular to the light incident surface.

16. The light source module according to claim 15, characterized in that: The plurality of second optical microstructures are arranged along a second direction, the second direction is not perpendicular to the light incident surface, and the second direction intersects with the first direction.

17. The light source module according to claim 16, characterized in that: The first direction and the second direction are not parallel to the light incident surface.

18. The light source module according to claim 10, characterized in that: The distribution density of the plurality of optical microstructures on the first surface increases along a direction away from the light incident surface.

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