Lighting panel and lighting panel assembly
Patent Information
- Authority / Receiving Office
- EP · EP
- Patent Type
- Applications
- Current Assignee / Owner
- HARMAN INT IND INC
- Filing Date
- 2023-07-13
- Publication Date
- 2026-05-20
AI Technical Summary
Existing edge-lit and direct-lit lighting panels face challenges in achieving uniform illumination while maintaining a thin profile and low power consumption.
The proposed lighting panel design incorporates a light guide plate with light-intake ports, positioned adjacent to light sources, and features a dual diffuser plate configuration with a specific spacing and coatings to enhance light uniformity and reduce shadows.
This design achieves uniform lighting distribution, reduces shadows and hotspots, and maintains a thin profile with low power consumption, addressing the limitations of existing edge-lit and direct-lit panels.
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Figure CN2023107213_16012025_PF_FP_ABST
Abstract
Description
LIGHTING PANEL AND LIGHTING PANEL ASSEMBLYTECHNICAL FIELD
[0001] The present disclosure relates generally to a lighting panel and a lighting panel assembly comprising a plurality of lighting panels. Particularly, the present disclosure relates to an edge-lit lighting panel and a lighting panel assembly comprising a plurality of edge-lit lighting panels.BACKGROUND
[0002] Lighting panels are widely used in applications where uniform and efficient illumination is desired, including lighting fixtures for architectural and decorative purposes. There are two main types of light panels: direct-lit panels and edge-lit panels, each with their own advantages and limitations.
[0003] A direct-lit panel uses an array of light-emitting diodes (LEDs) placed uniformly behind the panel to ensuring a consistent level of brightness across an emitting surface of the panel. This design excels in providing uniform illumination, resulting in enhanced lighting quality. However, a direct-lit panel is relatively thick and power consumptive due to a large number of LEDs placed behind the panel.
[0004] An edge-lit panel, on the other hand, uses LEDs that are placed on the edges of the panel and use a light guide plate to distribute the light across the panel. This design results in a thinner and more energy-efficient panel, but it often suffers from issues such as non-uniform lighting.
[0005] In lighting applications, it is often desirable to form a particular lighting pattern by splicing multiple lighting panels together, either on a wall or in a fixture. However, this may result in less desirable effects with edge-lit panels due to the non-uniformity of lighting across the panel.
[0006] There is a need for a new lighting panel that may overcome the drawbacks of existing edge-lit and direct-lit panels.SUMMARY OF THE INVENTION
[0007] The present disclosure aims to overcome the drawbacks of existing edge-lit and direct-lit panels by providing an innovative edge-lit panel design specifically designed for a uniform illumination. Specifically, the present disclosure aims to provide an edge-lit panel that can achieve a uniform lighting while having the advantage of relatively thin profile and a low power consumption.
[0008] According to one aspect of the disclosure, a lighting panel is provided. The lighting panel has an axis and comprises: a light guide plate having a first surface and an opposite second surface, and at least one light-intake port provided between the first surface and the second surface of the light guide plate; at least one light source, each of which positioned adjacent to one of the at least one light-intake port; a first light diffuser plate and a second light diffuser plate positioned on a side of the light guide plate and parallel to the light guide plate, the first light diffuser plate having a first surface and an opposite second surface and being positioned with its first surface adjacent to the second surface of the light guide plate, and the second light diffuser plate being spaced from the first light diffuser plate in an axial direction.
[0009] According to another aspect of the disclosure, a lighting panel assembly is provided. The lighting panel assembly comprises a plurality of lighting panels, the plurality of lighting panels being assembled together.BRIEF DESCRIPTION OF THE DRAWINGS
[0010] The present disclosure will be better understood by reference to the following drawings and description. The components shown in the drawings are not necessarily to scale, instead, emphasis should be placed upon the principles illustrated by the disclosure. Moreover, in the figures, like reference numerals designate like parts throughout the drawings.
[0011] Fig. 1 is a perspective view of a lighting panel according to one or more embodiments of the present disclosure;
[0012] Fig. 2A is a sectional view of the lighting panel of Fig. 1;
[0013] Fig. 2B is an enlarged view of the dotted line portion of Fig. 2A;
[0014] Fig. 3 is an enlarged top view showing a configuration of a light source;
[0015] Fig. 4A is a top view of the lighting panel, with the second housing portion, the first and second diffuser plates and the support removed to reveal the light source and the light guide plate;
[0016] Fig. 4B is an enlarged view of the dotted line portion of Fig. 4A, showing the structures of a light source and its corresponding light intake port;
[0017] Fig. 4C is an enlarged view of the dotted line portion of Fig. 4B;
[0018] Fig. 4D is a perspective view, showing the structures of the light source and the light intake port of Fig. 4B;
[0019] Fig. 5 is a schematic sectional view showing coatings provided on the first surface of the first diffuser plate;
[0020] Fig. 6 is a top view of the lighting panel, with the second housing portion, the first and second diffuser plates and the support removed to reveal the light source and the light guide plate; and
[0021] Fig. 7 is a schematic view showing a lighting panel assembly according to one or more embodiments of the present disclosure.
[0022] BRIEF DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0023] Hereinafter, various embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings.
[0024] As used herein, the singular forms “a” , “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms “comprises” , “comprising” , “includes” and / or “including” , as used herein, specify the presence of stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or combinations thereof. As used herein, the term “and / or” and the symbol “ / ” are meant to include any and all combinations of one or more of the associated listed items. Additionally, while the terms first, second etc., may be used herein to describe various elements, components, steps or calculations, these elements, components, steps, or calculations should not be limited by these terms, rather, these terms are only used to distinguish one element, component, step, or calculation from another. For example, a first component may be referred to as a second component, similarly a first calculation may be referred to as a second calculation; likewise, a first step may be referred to as a second step, all without departing from the scope of this disclosure.
[0025] To clarify the use in the pending claims and to hereby provide notice to the public, the phrases “at least one of , , . . . and <N>” or “at least one of , , . . . <N>, or combinations thereof” are defined by the Applicant in the broadest sense, superseding any other implied definitions herebefore or hereinafter unless expressly asserted by the Applicant to the contrary, to mean one or more elements selected from the group comprising A, B, . . . and N, that is to say, any combination of one or more of the elements A, B, . . . or N including any one element alone or in combination with one or more of the other elements which may also include, in combination, additional elements not listed.
[0026] As used herein, the term “axis” means a central axis passing through the lighting panel, the term “axial direction” means a direction along the axis. The term “radial direction” means a direction perpendicular to the axis, towards or away from the axis. The term “radially inner” , “inner” or “inner portion” means a direction, a position, or a portion that is relatively closer to the axis and the term “radially outer” , “outer” or “outer portion” means a direction, a position or a portion that is relatively away from the axis.
[0027] The present disclosure provides a lighting panel, comprising: a light guide plate having a first surface and an opposite second surface, and at least one light-intake port therebetween; at least one light source, each of which positioned adjacent to one of the at least one light-intake port; a first light diffuser plate and a second light diffuser plate positioned parallel to the light guide plate, the second light diffuser plate being spaced from the first light diffuser plate in an axial direction. In one or more embodiments, the distance may be 3mm to 10mm, 4.5mm to 8mm, or about 5.5mm.
[0028] This arrangement allows the light passing through the first diffuser plate to be further scattered and diffused by the second diffuser plate. This smooths out any unevenness in the light and creates a more uniform light distribution, while also reducing any shadows or hotspots.
[0029] In one or more embodiments, each of the light sources comprises two segments arranged in a V-shape, with an apex of the V-shape pointing toward a center of the light guide plate, the two segments define an angle facing the center of the light guide plate, the angle being larger than 180° and smaller than 230°.
[0030] By having an increased angle (larger than 180°) of the segments of the light sources in the plane of the light guide plate, the emitting angle of the light from the light source in the plane of the light guide plate may be increased. This helps in reducing shadows or dark areas midway between light sources. Additionally, the V-shape of the light source reduces the light transmitted to areas directly in front of the light sources, resulting in a decrease in hotspots or highlight areas directly in front of the light sources.
[0031] In one or more embodiments, the lighting panel comprises a white coating and a gray coating provided on the first surface of the first diffuser plate in a region adjacent to the light source, with the white coating being sandwiched between the first diffuser plate and the gray coating.
[0032] The gray coating serves to attenuate or reduce the amount of light that passes through it, particularly in areas adjacent to the light source where the light is more intense or concentrated. This helps to prevent the formation of hotspots, which can be distracting and negatively affect the overall appearance of the lighting panel. The white coating serves to mask the gray coating and ensure that the lighting panel presents a desirable lighting and color consistency, even in areas where the light is attenuated by the gray coating.
[0033] Fig. 1 is a perspective view of a lighting panel 100 according to one or more embodiments of the present disclosure. As shown, the lighting panel 100 is of a hexagonal shape and has an axis x passing through its center.
[0034] Fig. 2A is a sectional view of the lighting panel 100, and Fig. 2B is an enlarged view of the dotted line portion of Fig. 2A. The lighting panel 100 comprises six light sources 110, a light guide plate 120, a first diffuser plate 150 and a second diffuser plate 170. The light guide plate 120 is of a substantially hexagonal shape as the lighting panel 100 and has six corners. The light guide plate 120 has a first surface 122 and a second surface opposite to the first surface 122, and six light intake ports 130 provided between the first surface 122 and the second surface 124. Each of six light intake ports 130 is provided at one of the six corners of the light guide plate 120. The six light sources 110 are provided, respectively, at the six corners of the light guide plate 120, with each of the six light sources 110 being positioned adjacent to, and optically coupled to one of the six light intake ports 130. This allows the light emitted from each of the light sources 110 to enter the light guide plate 120 through a respective light intake port 130.
[0035] The first diffuser plate 150 is of a similar hexagonal shape as the light guide panel 120 and has a first surface 152 and a second surface 154 opposite to the first surface 152. The first diffuser plate 150 is positioned or orientated in parallel to the light guide plate 120, with its first surface 152 located adjacent to or in contact with the second surface 124 of the light guide plate 120. Light from the light sources 110 can travel from the light guide plate 120 to the first diffuser plate 150 through the second surface 124 of the light guide plate 124 and the first surface 152 of the first diffuser plate 150. The second diffuser plate 170 is of a similar hexagonal shape as the first diffuser plate 150, and is positioned on the same side of the light guide plate 120 as the first diffuser plate 150. The second diffuser plate 170 is positioned or oriented in parallel to the first diffuser plate 150 and is spaced from the first diffuser plate 150 by a distance D.
[0036] In one or more embodiments of the present disclosure, the first and / or second diffuser plates 150, 170 contain numerous microstructures dispersed throughout. The microstructures function to scatter light passing through the diffuser plates. As light enters the diffuser plate 150, 170, it encounters the microstructures, which cause the light to scatter in many different directions. This scattering breaks up the light into many smaller beams that are redirected in different directions. As a result, the light is spread out more evenly across the surface of the diffuser plate, creating a more uniform distribution of light.
[0037] In some embodiments of the present disclosure, the microstructures may be microspheres made of PMMA (polymethyl methacrylate) or PS (polystyrene) or any other suitable material. In some other embodiments, the first and / or second diffuser plates 150, 170 may comprise a rough surface that scatters light.
[0038] In the embodiment shown, the lighting panel 100 comprises the first and second diffuser plates, which are parallel to each other and are spaced apart by a distance D. This arrangement allows the light passing through the first diffuser plate 150 to be further scattered and diffused by the second diffuser plate 170. This smooths out any unevenness in the light and create a more uniform light distribution, while also reducing any shadows or hotspots.
[0039] The distance D between the first and second diffuser plates 150, 170 is important. An appropriate distance D ensures optimum light uniformity while guaranteeing optimum illumination. If the first and second diffuser plates 150, 170 are too close together, the light may not scatter enough between them and the benefits of the second diffuser plate may be lessened. On the other hand, if the first and second diffuser plates 150, 170 are spaced too far apart, the light may start to diverge, which may result in a degraded lighting effect. The thickness of the lighting panel 100 may also become undesirably large. In one or more embodiments of the present disclosure, the distance D may range from 3mm to 10mm. In one or more embodiments of the present disclosure, the distance D may range from 4.5mm to 8mm. In some embodiments, the distance D1 may be about 5.5mm.
[0040] As shown in Figs. 1, 2A-2B, the lighting panel 100 further comprises a support 188 that supports the second diffuser plate 170, keeping it parallel to and spaced apart from the first diffuser plate 150. The support 188 may be transparent so that it does not affect the light transmission or illumination of the lighting panel 100. The support 188 may be of any suitable structure or form as long as it can properly support and space the second diffuser plate 170 from the first diffuser plate 150. In one or more other embodiments of the present disclosure, a separate support may be omitted and the first and / or second diffuser plate 150, 170 may comprise an integral structure that may space the second diffuser plate 170 from the first diffuser plate 150.
[0041] As shown in Figs. 2A-2B, each of the light source 110 is mounted on a PCB 118, which is attached to the first surface 122 of the light guide plate 120 to position the light source 110 in relation to the light intake port 130 of the light guide plate 120. Each of the light sources 110 may be LEDs mounted in housings so that they only emit light in one direction, toward the light intake port 130 of the light guide plate 120. In one or more other embodiments of the present disclosure, the PCB 118 may have any suitable structure. In some other embodiments of the present disclosure, the PCB 118 may be omitted and the light source 110 may be any appropriate light source, as long as it is properly positioned to emit light toward the light intake port 130 of the light guide plate 120.
[0042] The lighting panel 100 further comprises a housing 190. The housing 190 comprises a first housing portion 192 and a second housing portion 194, which are mated together to define an inner space for accommodating therein components, such as the light sources, the light guide plate, the first and second diffuser plates. The second housing portion may be transparent, allowing the light to pass through. In one or more other embodiments, the housing may have any suitable structure as long as it can house the components therein and allow the light to pass through.
[0043] In the embodiments shown, the lighting panel 100 is of a hexagonal shape. However, the present disclosure is not limited thereto. In one or more other embodiments, the lighting panel may be of any suitable shape, including a polygonal shape having a plurality of corners. The lighting plate may correspondingly comprise a plurality of light-intake ports, each of which is positioned adjacent to one corner of the lighting panel, and a plurality of light sources, with each of the plurality of light sources being positioned adjacent to one of the plurality of light-intake ports.
[0044] Fig. 3 is an enlarged top view showing a configuration of a light source 110. The light source 110 is positioned adjacent to a respective light intake port that is at one corner of the hexagon of the light guide plate, and is configured to emit light that travels into the light guide plate through the light intake port. The light source 110 comprises two segments 112, 114 arranged in a V-shape, with the apex of the V-shape pointing toward a center of the lighting panel 100 or the light guide plate 120. The two segments 112, 114 of the light source 110 define an angle α that is in a plane of the light guide plate 120 and faces a center of the lighting panel 100 or the light guide plate 120.
[0045] In a conventional edge-lit lighting panel having a linear light source configuration (corresponding to an angle α of 180°) , normally there exist shadow or dark areas in the midway between light sources and hotspots or highlight areas directly in front of or radially inward of the light sources. In the lighting panel 100 of the present disclosure, by having an increased angle α (larger than 180°) of the segments of the light sources in the plane of the light guide plate 120, the emitting angle of the light from the light source 110 in the plane of the light guide plate 120 may be increased. This helps in reducing shadows or dark areas midway between light sources 110. Additionally, the V-shape of the light source 110 reduces the light transmitted to areas directly in front of or radially inward of the light sources 110, resulting in a decrease in hotspots or highlight areas directly in front of the light sources. An appropriate angle α can reduce the shadows or dark areas midway between light sources and hotspots or highlight areas directly in front of the light sources, resulting in a more uniform lighting effect. In one or more embodiments of the present disclosure, the angle α may be larger than 180° and smaller than 230°. In one or more other embodiments of the present disclosure, the angle α may be larger than 190° and smaller than 210°. In one or more other embodiments, the angle α may be about 200°.
[0046] Fig. 4A shows a top view of the lighting panel 100, with the second housing portion, the first and second diffuser plates and the support removed to reveal the light source 110 and the light guide plate 120. Fig. 4B is an enlarged view of the dotted line portion of Fig. 4A, showing the structures of the light source 110 and its corresponding light intake port 130. Fig. 4C is an enlarged view of the dotted line portion of Fig. 4B. Fig. 4D is a perspective view of the light source 110 and the light intake port 130 shown in Fig. 4B. Corresponding to the dual segment structure of the light source 110, the light intake port 130 also has a dual segment structure. Specifically, the light intake port 130 has a first port segment 132 and a second port segment 134, with the first port segment 132 angled with respect to the second port segment 134. As shown, the first port segment 132 is positioned adjacent to and parallel to the segment 112 of the light source 110 and the second port segment 134 is positioned adjacent to and parallel to the segment 114 of the light source 110. This arrangement facilitates the entry of the light emitted from the segments 112, 114 into the light guide plate 120 via the first port segment 132 and the second port segment 134.
[0047] As clearly shown in Figs. 4B-4D, each of the first and second port segments 132, 134 is formed with a series of axial slots 136. In the embodiment shown, the axial slots 136 are of V-shapes, resulting in the first and second port segments 132, 134 forming a zigzag shape in the top view of Figs. 4B-4C. In one or more embodiments of the disclosure, the axial slots may have any other suitable structure or configuration.
[0048] The axial slots in the first and second port segments 132, 134 functions to refract the light passing through the light intake port 130 in the plane of the light guide plate 120. When light enters the light guide plate through the light intake port 130, it is refracted into multiple directions. This arrangement increases the angle at which light enters the light guide plate 120 and improves the uniformity of the light, resulting in a more uniform and consistent lighting effect.
[0049] Fig. 5 is a schematic sectional view showing coatings 162, 164 provided on the first surface 152 of the first diffuser plate 150. The first diffuser plate 150 is formed with a gray coating 162 and a white coating 164 on its first surface 152 in an area above or adjacent to the light source 110, with the white coating 164 sandwiched between the gray coating 162 and the first diffuser plate 150. The gray coating serves to attenuate or reduce the amount of light that passes through it, particularly in area above or adjacent to the light source 110 where the light is more intense or concentrated. This helps to prevent the formation of hotspots, which can be distracting and negatively affect the overall appearance of the lighting panel. The gray coating ensures a more even and uniform distribution of light across the lighting panel 100.
[0050] In one or more embodiments, the white coating 164 is sandwiched between the gray coating 162 and the first diffuser plate 150. The white coating 164 serves to mask the gray coating 162 and ensure that the lighting panel presents a desirable lighting and color consistency, even in areas where the light is attenuated by the gray coating 162.
[0051] The grayscale of the gray coating 162 may be carefully selected to regulate attenuation of light and create a uniform lighting effect. If the grayscale value is too high, the coating may attenuate too much light, resulting in a dimmer and less uniform lighting effect. On the other hand, if the grayscale value is too low, the coating may not attenuate enough light, resulting in hotspots and uneven lighting.
[0052] In one or more embodiments, the gray coating 162 may be graded, allowing for a varying level of attenuation across the surface of the gray coating 162. Graded gray coatings 162 may compensate for variations in the light output of the light source where the light output is stronger near the light source. By using a graded gray coating 162 that attenuates more light in areas near the light source, it is possible to create a more uniform lighting effect across the surface of the lighting panel 100.
[0053] Fig. 6 is a top view of the lighting panel 100, without the second housing portion 194, the first and second diffuser plates 150, 170 and the support 188 to reveal the light source 110 and the light guide plate 120.
[0054] The light guide plate 120 may be formed with numerous dots on its second surface 124. In one or more embodiments, the dots may be distributed throughout the entire surface of the second surface 124 of the light guide plate 120. In some embodiments, the dots are formed by a laser and are in micron size range. The dots on the second surface 124 of the light guide plate 120 function to scatter the light, and to increase the light emitted from the second surface 124 of the light guide plate 120 to the first diffuser plate 150. The size and / or density of the dots can be adjusted to compensate any luminance difference across the second surface 124 of the light guide plate 120.
[0055] Fig. 6 shows dots 142 in the area directly in front of the light sources 110 and dots 144 provided midway between light sources 110. Note that the dots 142, 144 shown in Fig. 6 are merely illustrative and are magnified or enlarged so that they can be clearly shown in the Figure. As shown, the dots 142 have a relatively small diameter while the dots 144 have a relatively large diameter.
[0056] The dots 142 and dot 144 having different diameters functions to provide a uniform lighting effect across the second surface 124 of the light guide plate 120. Specifically, to prevent a hotspot or highlight area directly in front of the light sources 110, with a shadow or dark area situated midway between light sources, the embodiments shown in Fig. 6 utilize dots 142 with a relatively small diameter in the area directly in front of the light sources 110. This ensures that less light is scattered from the second surface 124 of the light guide plate 120 in that region. On the other hand, dots 144 with relatively large diameter are provided midway between light sources to compensate for the shadow or dark area by scattering more light from the second surface 124 of the light guide plate 120 in that region.
[0057] The size and density of dots on the second surface 124 of the light guide plate 120 may be determined by the following process. The process involves performing a test before dots are formed on the second surface 124 of the light guide plate 120, i.e., when there are no dots on the second surface of the light guide plate. The light guide plate 120 is illuminated using light sources 110, and a camera is used to detect the distribution of light emitted from the light guide plate 120.
[0058] The distribution of light detected by the camera is analyzed to identify any areas of uneven or inconsistent lighting. These areas may appear as hotspots or shadows on the image captured by the camera. The size and density of the dots 142, 144 on the second surface 124 of the light guide plate 120 can then be determined based on the distribution of light detected by the camera.
[0059] In the case of manual determination, an operator may use the image captured by the camera to mark areas of uneven lighting and determine the appropriate size and density of dots to be added to the second surface of the light guide plate. This may involve trial and error testing to determine the optimal configuration of dots.
[0060] In the case of computer software determination, the image captured by the camera may be analyzed using image processing algorithms to automatically detect areas of uneven lighting and determine the appropriate size and density of dots to be added to the second surface of the light guide plate. The software may also provide a simulation of the expected lighting distribution based on different configurations of dots, which can help to optimize the design of the light guide plate.
[0061] Once the appropriate size and density of dots have been determined, the dots can be added to the second surface of the light guide plate using various methods, such as by using a laser.
[0062] Fig. 7 is a schematic view showing a lighting panel assembly 10 according to one or more embodiments of the present disclosure. The lighting panel assembly 10 comprises a plurality of lighting panels 12, each of which is of a hexagonal shape. Any number of the lighting panels 12 may be assembled to form any suitable shape of pattern according to the user’s need. In one or more embodiments of the present disclosure, the lighting panels 12 may be the lighting panel 100 as shown in Figs. 1-6.
[0063] According to one or more embodiments of the disclosure, the present disclosure can be implemented as follows.
[0064] Item 1: A lighting panel having an axis, comprising: a light guide plate having a first surface and an opposite second surface, and at least one light-intake port provided between the first surface and the second surface of the light guide plate; at least one light source, each of which positioned adjacent to one of the at least one light-intake port; a first light diffuser plate and a second light diffuser plate positioned on a side of the light guide plate and parallel to the light guide plate, the first light diffuser plate having a first surface and an opposite second surface and being positioned with its first surface adjacent to the second surface of the light guide plate, and the second light diffuser plate being spaced from the first light diffuser plate in an axial direction.
[0065] Item 2: The lighting panel as claimed in Item 1, wherein the lighting panel is of a polygonal shape having a plurality of corners, wherein the at least one light-intake port comprises a plurality of light-intake ports, each of which positioned adjacent to one corner of the lighting panel, wherein the at least one light source comprises a plurality of light sources, with each of the plurality of light sources being positioned adjacent to one of the plurality of light-intake ports.
[0066] Item 3: The lighting panel as claimed in any one of Items 1-2, wherein each of the plurality of light sources comprises two segments arranged in a V-shape, with an apex of the V-shape pointing toward a center of the light guide plate, the two segments define an angle facing the center of the light guide plate, the angle being larger than 180° and smaller than 230°.
[0067] Item 4: The lighting panel as claimed in any one of Items 1-3, wherein each of the at least one light-intake port is formed with a series of axial slots.
[0068] Item 5: The lighting panel as claimed in any one of Items 1-4, wherein each of the at least one light-intake port has a first port segment and a second port segment, with the first port segment angled with respect to the second port segment, each of the first and second port segments is positioned adjacent to and parallel to a respective segment of the light source, each of the at least one light-intake port is formed with a series of axial slots.
[0069] Item 6: The lighting panel as claimed in any one of Items 1-5, wherein the lighting panel comprises a gray coating provided on the first surface of the first diffuser plate in a region adjacent to the light source.
[0070] Item 7: The lighting panel as claimed in any one of Items 1-6, wherein the lighting panel comprises a white coating and a gray coating provided on the first surface of the first diffuser plate in a region adjacent to the light source, with the white coating being sandwiched between the first diffuser plate and the gray coating.
[0071] Item 8: The lighting panel as claimed in any one of Items 1-7, wherein the lighting panel is of a polygonal shape having a plurality of corners, the at least one light-intake port comprises a plurality of light-intake ports, each of which positioned adjacent to one corner of the lighting panel, the light source comprises a plurality of light sources, with each of the plurality of light sources being positioned adjacent to one of the plurality of light-intake ports, the light guide plate is formed with dots on the second surface of the light guide plate, with dots in an area directly in front of each light source having a relatively small diameter and dots in an area midway between two adjacent light sources having a relatively large diameter.
[0072] Item 9: The lighting panel as claimed in any one of Items 1-8, wherein the second light diffuser plate is spaced from the first light diffuser plate by a distance of 3-10mm.
[0073] Item 10: The lighting panel as claimed in any one of Items 1-9, wherein the lighting panel is of a hexagonal shape having six corners, the at least one light-intake port comprises six light-intake ports, each of which positioned adjacent to one corner of the lighting panel, the light source comprises six light sources, with each of the six light sources being positioned adjacent to one of the six light-intake ports.
[0074] Item 11: The lighting panel as claimed in any one of Items 1-10, wherein the lighting panel comprises a support, the support being transparent and configured to support and space the second diffuser plate from the first diffuser plate.
[0075] Item 12: A lighting panel assembly, comprising a plurality of lighting panels as claims in any of Items 1-11, the plurality of lighting panels being assembled together.
[0076] Systems and methods have been described in general terms as an aid to understanding details of the disclosure. In some instances, well-known structures, materials, and / or operations have not been specifically shown or described in detail to prevent obscuring aspects of the disclosure. In other instances, specific details have been given to provide a thorough understanding of the disclosure. One skilled in the relevant art will recognize that the disclosure may be embodied in other specific forms, for example to adapt to a particular system or apparatus or situation or material or component, without departing from the spirit or essential characteristics thereof. Therefore, the disclosures and descriptions herein are intended to be illustrative, but not limiting, of the scope of the disclosure. Accordingly, the disclosure is not to be restricted except considering the attached claims and their equivalents.
Claims
1.A lighting panel having an axis, comprising:a light guide plate having a first surface and an opposite second surface, and at least one light-intake port provided between the first surface and the second surface of the light guide plate;at least one light source, each of which positioned adjacent to one of the at least one light-intake port;a first light diffuser plate and a second light diffuser plate positioned on a side of the light guide plate and parallel to the light guide plate, the first light diffuser plate having a first surface and an opposite second surface and being positioned with its first surface adjacent to the second surface of the light guide plate, and the second light diffuser plate being spaced from the first light diffuser plate in an axial direction.2.The lighting panel as claimed in claim 1,wherein the lighting panel is of a polygonal shape having a plurality of corners,wherein the at least one light-intake port comprises a plurality of light-intake ports, each of which positioned adjacent to one corner of the lighting panel,wherein the at least one light source comprises a plurality of light sources, with each of the plurality of light sources being positioned adjacent to one of the plurality of light-intake ports.3.The lighting panel as claimed in claim 2, wherein each of the plurality of light sources comprises two segments arranged in a V-shape, with an apex of the V-shape pointing toward a center of the light guide plate, the two segments define an angle facing the center of the light guide plate, the angle being larger than 180° and smaller than 230°.4.The lighting panel as claimed in claim 1, wherein each of the at least one light-intake port is formed with a series of axial slots.5.The lighting panel as claimed in claim 3, whereineach of the at least one light-intake port has a first port segment and a second port segment, with the first port segment angled with respect to the second port segment,each of the first and second port segments is positioned adjacent to and parallel to a respective segment of the light source,each of the at least one light-intake port is formed with a series of axial slots.6.The lighting panel as claimed in any one of claims 1-5, wherein the lighting panel comprises a gray coating provided on the first surface of the first diffuser plate in a region adjacent to the light source.7.The lighting panel as claimed in any one of claims 1-5, wherein the lighting panel comprises a white coating and a gray coating provided on the first surface of the first diffuser plate in a region adjacent to the light source, with the white coating being sandwiched between the first diffuser plate and the gray coating.8.The lighting panel as claimed in any one of claims 1-5, whereinthe lighting panel is of a polygonal shape having a plurality of corners,the at least one light-intake port comprises a plurality of light-intake ports, each of which positioned adjacent to one corner of the lighting panel,the light source comprises a plurality of light sources, with each of the plurality of light sources being positioned adjacent to one of the plurality of light-intake ports,the light guide plate is formed with dots on the second surface of the light guide plate, with dots in an area directly in front of each light source having a relatively small diameter and dots in an area midway between two adjacent light sources having a relatively large diameter.9.The lighting panel as claimed in any one of claims 1-5, wherein the second light diffuser plate is spaced from the first light diffuser plate by a distance of 3-10mm.10.The lighting panel as claimed in any one of claims 1-5, whereinthe lighting panel is of a hexagonal shape having six corners,the at least one light-intake port comprises six light-intake ports, each of which positioned adjacent to one corner of the lighting panel,the light source comprises six light sources, with each of the six light sources being positioned adjacent to one of the six light-intake ports.11.The lighting panel as claimed in any one of claims 1-5, wherein the lighting panel comprises a support, the support being transparent and configured to support and space the second diffuser plate from the first diffuser plate.12.A lighting panel assembly, comprising a plurality of lighting panels as claimed in any one of claims 1-11, the plurality of lighting panels being assembled together.