Light guide plate and plane light source device
By setting through holes on the light guide plate, the heat of the LED is dissipated, and the problem of yellowing of the light guide plate due to proximity to the heating LED for a long time is solved, and the long-term durability and efficient optical performance of the light guide plate are achieved.
Patent Information
- Application Number
- CN202510255466.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2021-12-06
- Publication Date
- 2025-05-06
AI Technical Summary
The existing light guide plates are yellowed due to proximity to heat LEDs for a long time, affecting optical performance.
A light guide plate is designed, by setting through holes on the light guide plate, heat generated by the LED is emitted along the through holes, and heat is avoided from gathering on the light guide plate in the light surface.
It effectively avoids the yellowing of the light guide plate due to heat accumulation, extends the service life of the light guide plate, and improves optical performance.
Smart Images
Figure CN119934495A_ABST
Abstract
Description
[0001] This application is a divisional application. The application number of the original application is 202111477001.1, the application date is 2021.12.06, and the name of the invention is “A light guide plate and planar light source device”. Technical Field
[0002] The present invention relates to the field of optics, and in particular to a light guide plate and a planar light source device. Background Art
[0003] Existing planar light sources generally use light guide plates to convert line light sources into planar light sources. Linear light sources are generally realized by linearly arranged LEDs. The LEDs on the light strip need to be placed very close to the light guide plate to allow as much light as possible to enter the light guide plate. As a result, the light guide plate near the LED side turns yellow due to long-term proximity to the heated LED. It is necessary to provide a light guide plate to solve this problem. Summary of the invention
[0004] The present invention provides a light guide plate, which can dissipate the heat of LEDs and prevent the heat from accumulating and causing yellowing of the light guide plate.
[0005] The light guide plate provided according to the present invention includes a first surface, which is a light incident surface; a second surface, which is a light emitting surface, and the light incident surface is adjacent to the light emitting surface; a third surface, which is other surface on the light guide plate that is different from the first surface and the second surface; and at least one through hole, which extends from the first surface to the inside of the light guide plate and passes through the third surface, and the through hole includes a first port and a second port, the first port is arranged on the light incident surface, and the second port is arranged on the third surface.
[0006] Preferably, the third surface is arranged opposite to the first surface and is adjacent to the light emitting surface.
[0007] Preferably, the light guide plate also includes a bottom surface, which is arranged opposite to the light emitting surface and adjacent to the first surface and the third surface; the through hole also includes a first inner surface and a second inner surface, a first inner side surface and a second inner side surface connecting the first inner surface and the second inner surface, the first inner surface is adjacent to the bottom surface compared to the second inner surface, and the second inner surface is adjacent to the light emitting surface compared to the first inner surface.
[0008] Preferably, the distance between the first inner surface and the second inner surface changes gradually or remains unchanged in the direction from the first surface to the third surface, the distance between the first inner surface and the second inner surface at the first port is H1, the distance between the first inner surface and the second inner surface at the second port is H2, and H1≥H2.
[0009] Preferably, the distance between the first inner surface and the second inner surface changes uniformly from the distance H1 at the first port to the distance H2 at the second port, or the distance between the first inner surface and the second inner surface decreases at least once and remains unchanged at least once during the process of changing from the distance H1 at the first port to the distance H2 at the second port.
[0010] Preferably, the third surface is arranged opposite to the second surface and is adjacent to the light incident surface.
[0011] Preferably, the light guide plate further includes a first side surface, which is arranged relative to the light incident surface and adjacent to the second surface and the third surface; the through hole further includes a third port, which is arranged on the first side surface.
[0012] Preferably, the cross-sections of the first port and the third port are independently selected from rectangular, circular or trapezoidal.
[0013] Preferably, the short side of the trapezoid is adjacent to the third surface, and the long side of the trapezoid is adjacent to the second surface.
[0014] Preferably, the light guide plate also includes a second side surface and a third side surface, the second side surface and the third side surface are arranged opposite to each other and adjacent to the first surface and the second surface, the third surface is one of the second side surface and the third side surface, and the through hole also includes a second port arranged on the second side surface or the second side surface and the third side surface.
[0015] Preferably, the cross-sections of the first port and the second port are independently selected from rectangular, circular or trapezoidal.
[0016] Preferably, the light guide plate further comprises a fourth surface arranged opposite to the light emitting surface, the fourth surface is adjacent to the first surface, the second surface is further coated to form a diffusion layer, and the fourth surface is further provided with a reflective layer.
[0017] The present invention further provides a planar light source device, comprising a light source and any of the aforementioned light guide plates, wherein the light source is arranged on the light incident surface of the light guide plate and corresponds to the through hole.
[0018] The present invention, based on the above light guide plate, can dissipate the heat generated by the light source along the through hole, avoiding heat accumulation on the light incident surface of the light guide plate, thereby preventing the light incident side of the light guide plate from yellowing due to long-term heat influence. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Attached Figure 1 A schematic diagram of a three-dimensional structure of a light guide plate according to an embodiment of the present invention; Attached Figure 2 A schematic diagram of the side structure of a light guide plate according to an embodiment of the present invention; Attached Figure 3 A schematic diagram of the side structure of a light guide plate according to an embodiment of the present invention; Attached Figure 4 A schematic diagram of the side structure of a light guide plate according to an embodiment of the present invention; Attached Figure 5 A schematic diagram of the side structure of a light guide plate according to an embodiment of the present invention; Attached Figure 6 A schematic diagram of the side structure of a light guide plate according to an embodiment of the present invention; Attached Figure 7 A schematic diagram of the side structure of a light guide plate according to an embodiment of the present invention; Attached Figures 8a-8d A schematic diagram of the structure of a light guide plate according to an embodiment of the present invention; Attached Figure 9a-9c A schematic diagram of the structure of a light guide plate according to an embodiment of the present invention; Attached Fig.10 A schematic diagram of a three-dimensional structure of a light guide plate according to an embodiment of the present invention; Attached Fig.11a , 11b is a schematic diagram of a cross-sectional structure of a first port or a second port of a light guide plate through hole according to an embodiment of the present invention; Attached Fig.12 A schematic diagram of the side structure of a light guide plate according to an embodiment of the present invention; Attached Fig.13 It is a schematic structural diagram of a planar light source device according to an embodiment of the present invention; Attached Fig.14 FIG. 4 is a schematic structural diagram of a planar light source device according to an embodiment of the present invention.
[0020] in: 100 / 100' / 100'' light guide plate; 101 light incident surface; 102 light exit surface; 103 bottom surface; 104 first side surface; 105 second side surface; 106 third side surface; 110 through hole; 111 first port; 112 second port; 113 first inner surface; 114 second inner surface; H1 first height; H2 second height; H3 third height; H4 fourth height; H5 fifth height; 1101 first flat section; 1102 second flat section; 1103 third flat section; 1104 first connecting section; 1105 second connecting section; 200 light source; 201 lamp beads; 120 diffusion layer; 130 reflection layer DETAILED DESCRIPTION The above and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of a preferred embodiment with reference to the drawings. The directional terms mentioned in the following embodiments, such as up, down, left, right, front or back, etc., are only reference directions of the drawings. Therefore, the directional terms used are used to illustrate and not to limit the present invention. The present invention is further described in detail below in conjunction with the drawings: like Figure 1 and Figure 21 is a schematic diagram of a three-dimensional structure and a schematic diagram of a side view of a light guide plate 100 in an embodiment of the present invention. The light guide plate 100 has a light incident surface 101, a light emitting surface 102, a bottom surface 103 opposite to the light emitting surface 102, a first side surface 104 opposite to the light incident surface 101, and a second side surface 105 and a third side surface 106 respectively connecting the light incident surface 101, the light emitting surface 102, the bottom surface 103 and the first side surface 104. The light guide plate 100 further comprises a through hole 110, wherein a first port 111 of the through hole 110 is disposed on the light incident surface 101, and a second port 112 of the through hole 110 is disposed on the first side surface 104; the through hole 110 further comprises a first inner surface 113 and a second inner surface 114, wherein the first inner surface 113 and the second inner surface 114 are disposed opposite to each other, the first inner surface 113 is adjacent to the bottom surface 103 relative to the second inner surface 114, and the second inner surface 114 is adjacent to the light emitting surface 102 relative to the first inner surface 113; the first inner surface 113 and the second inner surface 114 are adjacent to the light emitting surface 102; The distance between the inner surfaces 114 is represented by H. The distance between the first inner surface 113 and the second inner surface 114 at the first port 111 is H1, and the distance between the first inner surface 113 and the second inner surface 114 at the second port 112 is H2. In the present embodiment, the first inner surface 113 is parallel to the second inner surface 114, and the first inner surface 113 is also parallel to the bottom surface 103. It can be seen that H1=H2 in the present embodiment. In an embodiment, the first inner surface 113 is not parallel to the bottom surface 103, which is only an example here and is not limited to this.
[0021] like Figure 3 FIG. 1 is a schematic diagram of a side view structure of a light guide plate 100 in one embodiment of the present invention. Figure 3 Zhongyu Figure 2 The same reference numerals in the figures refer to the same structure. Figure 2 The difference is that, in this embodiment, the first inner surface 113 is not parallel to the second inner surface 114, and H1>H2, wherein the distance H1 between the first inner surface 113 and the second inner surface 114 at the first port 111 uniformly changes to the distance H2 between the first inner surface 113 and the second inner surface 114 at the second port 112.
[0022] like Figure 4 FIG. 1 is a schematic diagram of a side view structure of a light guide plate 100 in one embodiment of the present invention. Figure 4 Zhongyu Figure 2 The same reference numerals in the figures refer to the same structure. Figure 2 The difference is that, in this embodiment, the second inner surface 114 is parallel to the light emitting surface 102, the first inner surface 113 is not parallel to the second inner surface 114, and the first inner surface 113 is not parallel to the bottom surface 103, and H1>H2, wherein the distance H1 between the first inner surface 113 and the second inner surface 114 at the first port 111 uniformly changes to the distance H2 between the first inner surface 113 and the second inner surface 114 at the second port 112.
[0023] like Figure 5 FIG. 1 is a schematic diagram of a side view structure of a light guide plate 100 in one embodiment of the present invention. Figure 5 Zhongyu Figure 2 The same reference numerals in the figures refer to the same structure. Figure 2 The difference is that, in this embodiment, the first inner surface 113 is parallel to the bottom surface 103, the first inner surface 113 is not parallel to the second inner surface 114, and the second inner surface 114 is not parallel to the light emitting surface 102, and H1>H2, wherein the distance H1 between the first inner surface 113 and the second inner surface 114 at the first port 111 uniformly changes to the distance H2 between the first inner surface 113 and the second inner surface 114 at the second port 112.
[0024] like Figure 6 FIG. 1 is a schematic diagram of a side view structure of a light guide plate 100 in one embodiment of the present invention. Figure 6 Zhongyu Figure 2 The same reference numerals in the figures refer to the same structure. Figure 2The difference is that in this embodiment, the through hole 110 includes 5 sections, namely a first flat section 1101, a second flat section 1102, a third flat section 1103, and a first connecting section 1104 and a second connecting section 1105 connecting the first flat section 1101, the second flat section 1102 and the third flat section 1103. The first inner surface 113 and the second inner surface 114 respectively include five sections corresponding to the first flat section 1101, the second flat section 1102, the third flat section 1103, and the first connecting section 1104 and the second connecting section 1105. The distance H between the first inner surface 113 and the second inner surface 114 in the first flattened section 1101 is always H1, the distance H between the first inner surface 113 and the second inner surface 114 in the third flattened section 1103 is always H2, the distance H between the first inner surface 113 and the second inner surface 114 in the second flattened section 1102 is a constant value H4 (it can be understood that, for the convenience of marking, the connection between the second flattened section 1102 and the first connecting section 1104 is not strictly marked) and is between H1 and H2; the distance between the first inner surface 113 and the second inner surface 114 at the connection between the first connecting section 1104 and the first flattened section 1101 is H3 (it can be understood that , for the convenience of marking in the figure, the connection between the second flat section 1102 and the first connecting section 1104 is not strictly marked), H3=H1, the distance H between the first inner surface 113 and the second inner surface 114 in the first connecting section 1104 changes uniformly from H3 to H4; the distance between the first inner surface 113 and the second inner surface 114 at the connection between the second connecting section 1105 and the second flat section 1102 is H4, the distance between the first inner surface 113 and the second inner surface 114 at the connection between the second connecting section 1105 and the second flat section 1103 is H2, and the distance H between the first inner surface 113 and the second inner surface 114 in the second connecting section 1105 changes uniformly from H4 to H2.
[0025] like Figure 7 FIG. 1 is a schematic diagram of a side view structure of a light guide plate 100 in one embodiment of the present invention. Figure 7 Zhongyu Figure 6 The same reference numerals in the figures refer to the same structure. Figure 6 The difference is that the first inner surface 113 is a flat surface parallel to the bottom surface 103, and the second inner surface 114 includes five sections corresponding to the first flat section 1101, the second flat section 1102, the third flat section 1103, the first connecting section 1104 and the second connecting section 1105. Figure 6 The same is that the variation trend of the distance H between the first inner surface 113 and the second inner surface 114 in the first flat section 1101, the second flat section 1102, the third flat section 1103, and the first connecting section 1104 and the second connecting section 1105 of the through hole 110 is the same as that in Figure 6 The distance H in the illustrated embodiments has the same variation trend.
[0026] It can be understood that in other embodiments, the second inner surface 114 is a flat surface parallel to the bottom surface 103, and the first inner surface 113 includes five sections of surfaces corresponding to the first flat section 1101, the second flat section 1102, the third flat section 1103, the first connecting section 1104 and the second connecting section 1105, and the variation trend of the distance H between the first inner surface 113 and the second inner surface 114 in the first flat section 1101, the second flat section 1102, the third flat section 1103, and the first connecting section 1104 and the second connecting section 1105 of the through hole 110 is the same as that in FIG. Figure 6 The distance H in the illustrated embodiments has the same variation trend.
[0027] In other embodiments, the through hole 110 may include only the first flat section 1101 and the first connecting section 1104, and the end of the first connecting section 1104 away from the first flat section 1101 is the second port 112; or the through hole 110 may include only the first connecting section 1104 and the second flat section 1102, and the end of the first connecting section 1104 away from the first side surface 104 is the first port 111, and the end of the second end 1102 away from the first connecting section 1104 is the second port 112; in other embodiments, the number of flat sections and connecting sections can be alternately set according to needs to connect the first port 111 and the second port 112.
[0028] like Figure 8a-8b , which are a side view and a bottom view of a light guide plate 100 in one embodiment of the present invention. Figure 8a-8b Zhongyu Figure 2 The same reference numerals in the figures refer to the same structure. Figure 2 The difference is that the second port 112 is arranged on the bottom surface 103 .
[0029] like Figure 8c-8d , which are a side view and a bottom view of a light guide plate 100 in one embodiment of the present invention. Figure 8c-8d Zhongyu Figure 8a-8b The same reference numerals in the figures refer to the same structure. Figure 8a-8b The difference is that the through hole 110 is further provided with a first port 111 ′ on the first side surface 104 .
[0030] like Figure 9a-9b , which are a side view and a top view of a light guide plate 100 in one embodiment of the present invention. Figure 9a-9b Zhongyu Figure 2 The same reference numerals in the figures refer to the same structure. Figure 2 The difference is that the second port 112 is arranged on the second side surface 105 .
[0031] like Figure 9a and9c , which are a side view and a top view of a light guide plate 100 in one embodiment of the present invention. Figure 9a-9c Zhongyu Figure 9a-9b The same reference numerals in the figures refer to the same structure. Figure 9a-9b The difference is that the second port 112 is arranged on the second side surface 105 and the third side surface 106 .
[0032] like Fig.10 FIG. 1 is a schematic diagram of a three-dimensional structure of a light guide plate 100' in one embodiment of the present invention. Fig.10 Zhongyu Figure 1 The same reference numerals in the figures refer to the same structure. Figure 1 The difference is that the light guide plate 100' includes a plurality of through holes 110. The structure of the plurality of through holes 110 in this embodiment can be referred to Figure 1 -The structure of any through hole in Figure 9 is set.
[0033] like Fig.11a and 11b FIG. 1 is a schematic diagram of a first port structure 110 of a through hole of a light guide plate 100 / 100' in an embodiment of the present invention, which is different from FIG. Figure 1-Figure 10 The first port 110 is a rectangular first port 110. In this embodiment, the first port 110 is a trapezoid, and the short sides of the two parallel sides of the trapezoid are adjacent to the bottom surface 103, and the long sides of the two parallel sides of the trapezoid are adjacent to the light emitting surface 102. In another embodiment, Figure 1-Figure 7 The first port and the second port in FIG. 8 and FIG. 9 can be independently selected from a rectangle or a trapezoid; the first port and the third port in FIG. 8 and FIG. 9 can be independently selected from a rectangle or a trapezoid; that is, the through hole is Figure 1 - Based on the variation of FIG. 9 , the port shapes of the first port and the second port (or the third port) can be both trapezoidal or rectangular, or can be gradually changed from trapezoidal to rectangular, or from rectangular to trapezoidal.
[0034] like Fig.12 FIG. 1 is a schematic diagram of a side view of a light guide plate 100'' in an embodiment of the present invention. The light emitting surface 102 of the light guide plate 100'' is also coated with a diffusion layer 120, and the bottom surface 103 is provided with a reflection layer 130. The diffusion layer 120 is provided with diffusion particles. The through hole 110 can be Figure 1-Figure 1 1, when the through hole 110 is the through hole in FIG. 8 or FIG. 9, the reflective layer 130 is not disposed at the location corresponding to the second port 120. In other embodiments, the surface of the diffusion layer 120 away from the reflective layer 130 is a rough surface or is provided with a microstructure.
[0035] The present invention also provides a planar light source structure, such as Fig.13 and Fig.14 As shown, the planar light source structure includes a light source 200 and a light guide plate 100. The light guide plate 100 may be Figure 1-Figure 12The light source 200 includes a plurality of lamp beads 201, and the lamp beads 201 can be LEDs. Fig.13 As shown, all the lamp beads 201 correspond to the first port 111 of the through hole 110; Fig.14 As shown, when the light guide plate 100 includes a plurality of through holes 110, the first end of a through hole 110 corresponds to at least one lamp bead 201. Fig.14 In the illustrated embodiment, each lamp bead 201 corresponds to a through hole 110 ; in other embodiments, one through hole 100 may correspond to a plurality of lamp beads 201 .
[0036] The above description is only the preferred embodiment of the present invention, and it cannot be used to limit the scope of the implementation of the present invention. That is, all simple equivalent changes, combinations or modifications made according to the claims and description of the present invention are still within the scope of the patent coverage of the present invention. In addition, any embodiment or claim of the present invention is not required to achieve all the purposes, advantages or features disclosed by the present invention. In addition, the abstract and the name of the invention are only used to assist in the retrieval of patent documents, and are not used to limit the scope of rights of the present invention. In addition, the terms "first", "second", etc. mentioned in this specification or claims are only used to name the name of the element or distinguish different embodiments or scopes, and are not used to limit the upper or lower limit of the number of elements.
Claims
1. A light guide plate, characterized in that: The light guide plate includes A first surface, wherein the first surface is a light incident surface; a second surface, the second surface being a light emitting surface, the light incident surface being adjacent to the light emitting surface; A third surface, the third surface being another surface on the light guide plate different from the first surface and the second surface, the third surface being arranged opposite to the second surface and adjacent to the light incident surface; as well as at least one through hole, the through hole extending from the first surface to the inside of the light guide plate and passing through the third surface, the through hole comprising a first port and a second port, the first port being disposed on the light incident surface, and the second port being disposed on the third surface; The light guide plate further includes a first side surface, which is arranged relative to the light incident surface and adjacent to the second surface and the third surface; the through hole further includes a third port, which is arranged on the first side surface.
2. The light guide plate according to claim 1, characterized in that: The cross-sections of the first port and the third port are independently selected from any one of rectangular, circular and trapezoidal.
3. The light guide plate according to claim 2, characterized in that: The short side of the trapezoid is adjacent to the third surface, and the long side of the trapezoid is adjacent to the second surface.
4. The light guide plate according to claim 1, characterized in that: The light guide plate further includes a second side surface and a third side surface, wherein the second side surface and the third side surface are arranged opposite to each other and are adjacent to the first surface and the second surface.
5. The light guide plate according to claim 4, characterized in that: The third surface is one of the second side surface and the third side surface, and the second port is disposed on the second side surface or the second side surface and the third side surface.
6. The light guide plate according to claim 1, characterized in that: The cross-sections of the first port and the second port are independently selected from rectangular, circular or trapezoidal.
7. The light guide plate according to claim 1, characterized in that: The light guide plate further includes a fourth surface, which is opposite to the second surface and adjacent to the first surface; the second surface is also coated to form a diffusion layer, and the fourth surface is provided with a reflective layer.
8. A planar light source device, comprising a light source and a light guide plate, characterized in that: The light guide plate is the light guide plate described in any one of claims 1 to 7, and the light source is arranged on the light incident surface of the light guide plate and corresponds to the through hole.