EP4649263A1 - Luminaire with led panel and method of producing a luminaire - Google Patents

Luminaire with led panel and method of producing a luminaire

Info

Publication number
EP4649263A1
EP4649263A1 EP24700266.0A EP24700266A EP4649263A1 EP 4649263 A1 EP4649263 A1 EP 4649263A1 EP 24700266 A EP24700266 A EP 24700266A EP 4649263 A1 EP4649263 A1 EP 4649263A1
Authority
EP
European Patent Office
Prior art keywords
light
luminaire
coating
diffusing layer
providing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP24700266.0A
Other languages
German (de)
French (fr)
Inventor
Marc Andre De Samber
Norbertus Antonius Maria Sweegers
Hugo Johan Cornelissen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Signify Holding BV
Original Assignee
Signify Holding BV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Signify Holding BV filed Critical Signify Holding BV
Publication of EP4649263A1 publication Critical patent/EP4649263A1/en
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V3/00—Globes; Bowls; Cover glasses
    • F21V3/04—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings
    • F21V3/10—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings characterised by coatings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V3/00—Globes; Bowls; Cover glasses
    • F21V3/04—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings
    • F21V3/06—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings characterised by the material
    • F21V3/061—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings characterised by the material the material being glass
    • F21V3/0615—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings characterised by the material the material being glass the material diffusing light, e.g. translucent glass
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V3/00—Globes; Bowls; Cover glasses
    • F21V3/04—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings
    • F21V3/06—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings characterised by the material
    • F21V3/062—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings characterised by the material the material being plastics
    • F21V3/0625—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings characterised by the material the material being plastics the material diffusing light, e.g. translucent plastics
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00—Refractors for light sources
    • F21V5/002—Refractors for light sources using microoptical elements for redirecting or diffusing light
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/11—Anti-reflection coatings
    • G02B1/113—Anti-reflection coatings using inorganic layer materials only
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
    • G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
    • G02B5/0221—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures the surface having an irregular structure
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
    • G02B5/0263—Diffusing elements; Afocal elements characterised by the diffusing properties with positional variation of the diffusing properties, e.g. gradient or patterned diffuser
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0273—Diffusing elements; Afocal elements characterized by the use
    • G02B5/0278—Diffusing elements; Afocal elements characterized by the use used in transmission
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2105/00—Planar light sources
    • F21Y2105/10—Planar light sources comprising a two-dimensional [2D] array of point-like light-generating elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

Definitions

  • the present invention generally relates to luminaires comprising one or more light emitting diodes, LEDs. More specifically, the present invention is related to a luminaire with a LED panel.
  • LED light emitting diodes
  • lighting arrangements or luminaires which are less complex than present prior art arrangements, in particular regarding the number of components and the effort at assembly. It will be appreciated that there are numerous advantages associated with lighting arrangements or luminaires which are more structurally convenient and non-complex. For example, by using a minimal number of sourced components, the lighting arrangements or luminaires allow for an easy, convenient and/or diverse assembly, dismantling and/or replacement, an improved cost-efficiency, a more conveniently performed customization, etc.
  • a luminaire According to the first aspect of the present invention, there is provided a luminaire.
  • the luminaire comprises a light emitting diode, LED, panel comprising a plurality of light emitting diodes, LEDs, arranged to emit light.
  • the luminaire further comprises a light-diffusing layer arranged on the LED panel, wherein the light-diffusing layer is configured to diffuse at least a part of the emitted light.
  • the luminaire further comprises a coating arranged in a pattern on the light- diffusing layer.
  • the coating is a transparent index-matching coating having a refractive index that corresponds to a refractive index of the light-diffusing layer. Such a coating is arranged to modify at least one light transmission property of the light-diffusing layer.
  • the method comprises the step of providing a light emitting diode, LED, panel comprising a plurality of light emitting diodes, LEDs, arranged to emit light.
  • the method further comprises the step of providing a light-diffusing layer on the LED panel, wherein the light-diffusing layer is configured to diffuse at least a part of the emitted light.
  • the method further comprises the step of providing a coating in a pattern on the light-diffusing layer, wherein the coating is a transparent index-matching coating having a refractive index that corresponds to a refractive index of the light-diffusing layer, so that the coating is arranged to modify at least one light transmission property of the light-diffusing layer.
  • the present invention is based on the idea of a luminaire which combines a LED panel and a light-diffusing layer arranged thereon comprising a pattern coating for modifying property(ies) of the light-diffusing layer.
  • the luminaire is convenient and noncomplex in its structure whilst being able to achieve a desired lighting distribution and/or an aesthetical appearance of the light emitted from the luminaire by a patterned light emission appearance and/or light patterns.
  • the present invention is advantageous in its convenience of achieving a patterned light emission appearance by modifying the light-diffusing layer of the luminaire. Consequently, the luminaire is easily and conveniently customizable.
  • the present invention is further advantageous in that the convenience of the luminaire implies a cost-efficient arrangement as such, e.g. concerning the bill of materials. Furthermore, the convenience of the luminaire, notably by the relatively few components, leads to a cost-efficient assembly thereof. Hence, the luminaire provides cost-efficiency regarding material and/or manufacturing aspects.
  • the luminaire of the present invention comprises relatively few components.
  • the relatively low number of components is advantageous in that the luminaire is relatively inexpensive to fabricate.
  • the relatively low number of components of the luminaire implies an easier recycling, especially compared to devices or arrangements comprising a relatively high number of components which impede an easy disassembling and/or recycling operation.
  • the luminaire according to the present invention comprises a light emitting diode, LED, panel comprising a plurality of light emitting diodes, LEDs, arranged to emit light.
  • LED panel it is here meant e.g. a LED tile, a ledinaire, a (ceiling) panel, or the like.
  • the LED panel is preferably arranged, mounted and/or installed in a ceiling, on a wall, or the like.
  • the luminaire further comprises a light-diffusing layer arranged on the LED panel, wherein the light-diffusing layer is configured to diffuse at least a part of the emitted light.
  • light-diffusing layer it is here meant a relatively thin piece of material in the form of a layer, foil, plate, or the like, which is configured or arranged to at least partially diffuse light incident on the layer.
  • the luminaire comprises a coating which at least partially coats or covers a surface portion of the light-diffusing layer, wherein the coating is arranged in a pattern (e.g. a structure, configuration, etc.).
  • the coating is arranged to modify at least one light transmission property of the light-diffusing layer.
  • the coating is arranged or configured to modify, change and/or influence one or more light transmission properties of the light-diffusing layer. More specifically, the coating is arranged or configured to modify the transmission of the light- diffusing layer, either by increasing the transmission and/or by decreasing the transmission via the pattern.
  • the coating is an index-matching coating, wherein a refractive index of the index-matching coating corresponds to a refractive index of the light-diffusing layer.
  • index-matching coating it is here meant a coating which has a refractive index which is the same, or almost the same, as the material or element it coats or covers.
  • the index-matching coating may have a first refractive index, ni
  • the index-matching coating enhances (increases) the transmission of the light- diffusion layer.
  • the index-matching coating is provided on the lightdiffusion layer, the light diffusing properties of the light-diffusion layer are essentially compensated by the index-matching coating. Because the index-matching coating is transparent, these locations will be transparent rather than diffusive. This has the advantage that an improved and/or more customized pattern is achieved by the coating. Consequently, an improved lighting distribution and/or aesthetical appearance of the light from the luminaire is obtained.
  • the coating may be a light-scattering coating arranged to scatter the emitted light.
  • the light-scattering coating may reduce (decrease) the transmission of the light-diffusing layer, or in other terms, that the light-scattering coating may increase (enhance) the reflection of the light-diffusing layer.
  • the alternative allows an improved and/or customized pattern to be achieved by the coating. Consequently, an improved lighting distribution and/or aesthetical appearance of the light from the luminaire may be obtained.
  • the coating may comprise one of a foil, a paint, and a print.
  • the present embodiment is advantageous in that the coating in the form of a foil, a paint or a print provides a convenient and easily formed structure of the luminaire.
  • the present embodiment is further advantageous in that the coating in the form of a foil or a print may be produced separately from the (other components of the) luminaire, and thereafter be applied to the light-diffusing layer of the luminaire, which may lead to an even more convenient luminaire arrangement and/or production.
  • the light-diffusing layer may be arranged on the LED panel via lamination.
  • the present embodiment is advantageous in that lamination provides a relatively easy and efficient manner of providing the lightdiffusing layer on the LED panel.
  • the pattern of the coating may comprise a plurality of stripes arranged in parallel.
  • the coating may cover 10-40 % of an area, AT, of the light-diffusing layer.
  • the luminaire may comprise a mixing chamber arranged between the LED panel and the light-diffusing layer, wherein the mixing chamber is arranged to mix at least a part of the emitted light.
  • the mixing chamber may mitigate light losses of the luminaire. More specifically, the mixing chamber is configured to mix the emitted light for a recycling of the light after leaving the LED panel.
  • the step of providing the coating may comprise one of printing and painting the coating on the light-diffusing layer.
  • the present embodiment is advantageous in that the step of printing or painting the coating on the light-diffusing layer even further simplifies the manufacturing process of the luminaire.
  • a coating may be provided by ablation.
  • ablation e.g. via an ablation laser
  • the pattern of the coating may be provided conveniently.
  • Ablation may be used to enhance the reflection of the light-diffusing layer.
  • the step of providing the light-diffusing layer on the LED panel may comprise laminating the light-diffusing layer on the LED panel.
  • the step of providing the coating may comprise providing the pattern in a plurality of stripes arranged in parallel.
  • the step of providing the coating may comprise covering 10-40 % of an area, AT, of the light- diffusing layer with the coating.
  • Fig. la schematically shows a luminaire according to an exemplifying embodiment of the present invention
  • Fig. lb schematically shows a portion of a luminaire according to an exemplifying embodiment of the present invention
  • Figs. 2a-d schematically show a luminaire and its nominal operation
  • Figs. 3a-d and 4a-d schematically show a luminaire and its operation according to exemplifying embodiments of the present invention
  • Fig. 5 schematically shows a method for producing a luminaire according to an exemplifying embodiment of the present invention.
  • Fig. la schematically shows a luminaire 100 according to an exemplifying embodiment of the present invention.
  • the luminaire 100 comprises a light emitting diode, LED, panel 110 comprising a plurality of light emitting diodes, LEDs, arranged to emit light.
  • the LED panel 110 is exemplified as having a rectangular (square) shape in cross-section, but it should be noted that other forms are also feasible.
  • the LED panel 110 in Fig. 1 is embodied as a LED tile, a ledinaire, a (ceiling) panel, or the like, and the (relatively flat) LED panel 110 may preferably be arranged, mounted and/or installed in a ceiling or on a wall.
  • the LED panel 110 has a homogeneous diffuse emission pattern.
  • the luminaire 100 further comprises a light-diffusing layer 140 arranged on the LED panel 110.
  • the lightdiffusing layer 140 may, for example, be arranged on the LED panel 110 via lamination.
  • the light-diffusing layer 140 is configured to diffuse at least a part of the emitted light 130.
  • the light-diffusing layer 140 comprises a coating 150 arranged in a pattern 160 on the light- diffusing layer 140.
  • the coating 150 may, for example, be in the form of a foil, a paint or a print.
  • the coating 150 is arranged to modify at least one light transmission property (e.g. light transmission, light reflection, etc.) of the light-diffusing layer 140.
  • the light-diffusing layer 140 of the luminaire 100 comprises a coating 150 arranged in a pattern 160.
  • the pattern 160 may have substantially any form or configuration, and is merely presented in Fig. la as an example.
  • the coating 150 is exemplified as an indexmatching coating 152, wherein a refractive index of the index-matching coating 152 corresponds to a refractive index of the light-diffusing layer 140.
  • the index-matching coating 152 results in a (locally) enhanced transmission, T, of the emitted light 130 during operation of the luminaire 100.
  • T a (locally) enhanced transmission
  • Fig. la at a schematically indicated, rightmost part, C, of the luminaire 100, an operation of the luminaire 100 with a coating 150 in form of a lightscattering coating 154 is indicated.
  • the light-scattering coating 154 results in a (locally) enhanced reflection, R, of the emitted light 130 during operation of the luminaire 100.
  • Fig. lb schematically shows a portion of a luminaire 100 according to an exemplifying embodiment of the present invention.
  • D of the luminaire 100
  • the emitted light 130 is reflected and refracted at the facetted surface of the light-diffusing layer 140 of the luminaire 100.
  • E of the luminaire 100
  • the coating 150 is exemplified as an index-matching coating 152, wherein a refractive index, m, of the index-matching coating 152 corresponds to a refractive index, m, of the light-diffusing layer 140.
  • the index-matching coating 152 may hereby enhance (increase) the transmission of the light-diffusion layer 140 by decreasing (eliminating) reflection and refraction ad the facetted surface of the light-diffusing layer 140 of the luminaire 100.
  • Figs. 2a-d schematically show a luminaire 100 and its nominal operation.
  • the luminaire 100 has dimensions 600 x 600 x 50 mm.
  • the light-diffusing layer 140 has a thickness of 3 mm.
  • the luminaire 100 comprises 36 LEDs, arranged in a grid of 6 x 6 LEDs, wherein the illuminance of each LED is 100 Im.
  • the reflectivity is 49 %, the transmission is
  • the (total) emitted light 130 of the luminaire 100 is shown in Fig. 2b, wherein the x-axis represents the width of the illumination device 100 and the y-axis represents the height of the illumination device 100.
  • Fig. 2c schematically indicates the operation of the luminaire 100 and the emitted light 130 thereof.
  • An observer (indicated by an eye 220), looking straight into the luminaire 100, as shown in Fig. 2c, perceives the emitted light 130 of the luminaire 100 as shown in Fig. 2d.
  • Figs. 3a-d schematically show a luminaire 100 and its nominal operation. Analogously with the luminaire 100 of Fig. 2a, the luminaire 100 has dimensions 600 x 600 x
  • the luminaire 100 comprises 36 LEDs, arranged in a grid of 6 x 6 LEDs, wherein the illuminance of each LED is 100 Im.
  • the reflectivity is 49 %
  • the transmission is 49 %
  • the absorption in the light- diffusing layer is 2 %.
  • the luminaire 100 schematically shows a coating 150 according to an exemplifying embodiment of the present invention.
  • the coating 150 is arranged in a pattern 160, wherein the pattern 160 comprises a plurality of stripes 170a arranged in parallel.
  • the five stripes 170a of an index-matching coating have the dimensions 500 x 50 mm, and cover 35 % of an area, AT, of the light-diffusing layer 140 of the luminaire 100.
  • the (total) emitted light 130 of the luminaire 100 is shown in Fig. 3b, wherein the x-axis represents the width of the illumination device 100 and the y-axis represents the height of the illumination device 100.
  • Fig. 3c schematically indicates the operation of the luminaire 100 and the emitted light 130 thereof.
  • An observer (indicated by an eye 220), looking straight into the luminaire 100, as shown in Fig. 3c, perceives the emitted light 130 of the luminaire 100 as shown in Fig. 3d.
  • the total output of the emitted light 130 is increased from 2670 Im to 2717 Im, and the stripes 170a will appear darker than the surrounding.
  • Figs. 4a-d schematically show a luminaire 100 and its nominal operation.
  • the luminaire 100 has dimensions 600 x 600 x 50 mm, wherein the light-diffusing layer 140 has a thickness of 3 mm.
  • the luminaire 100 comprises 36 LEDs, arranged in a grid of 6 x 6 LEDs, wherein the illuminance of each LED is 100 Im.
  • the reflectivity is 94 %, the transmission is 4 % and the absorption in the light-diffusing layer is 2 %.
  • the luminaire 100 schematically shows a coating 150 according to an exemplifying embodiment of the present invention.
  • the coating 150 is arranged in a pattern 160, wherein the pattern 160 comprises a plurality of stripes 170b arranged in parallel.
  • the five stripes 170b of an index-matching coating have the dimensions 500 x 20 mm, and cover 14 % of an area, AT, of the light-diffusing layer 140 of the luminaire 100.
  • the (total) emitted light 130 of the luminaire 100 is shown in Fig. 4b, wherein the x-axis represents the width of the illumination device 100 and the y-axis represents the height of the illumination device 100.
  • Fig. 4c schematically indicates the operation of the luminaire 100 and the emitted light 130 thereof. An observer (indicated by an eye 220), looking straight into the luminaire 100, as shown in Fig.
  • the total output of the emitted light 130 is decreased from 2670 Im to 1288 Im.
  • the reflective coating 150 reduces locally the light output, and the stripes 170b will appear significantly brighter than the surrounding. It should be noted that by an increased width of the stripes 170b, the total output of the emitted light 130 may be increased during operation of the illumination device 100.
  • the illumination device 100 of the present invention as exemplified in Figs. 3a-d and 4a-d may comprise many different (alternative) configurations, and that many opportunities for customization are envisioned.
  • the coating 150 arranged in the pattern 160 e.g. the stripes 170a, 170b
  • the stripes 170a, 170b may appear darker or brighter than their surroundings. The appearance will be dependent on the viewing angle of an observer, and a 3D depth effect can furthermore be expected.
  • Fig. 5 schematically shows a method 500 for producing a luminaire according to an exemplifying embodiment of the present invention.
  • the method 500 comprises the step of providing 510 a light emitting diode, LED, panel comprising a plurality of light emitting diodes, LEDs, arranged to emit light.
  • the method 500 further comprises the step of providing 520 a light-diffusing layer on the LED panel, wherein the light-diffusing layer is configured to diffuse at least a part of the emitted light.
  • the step of providing 520 the light-diffusing layer on the LED panel may comprise laminating 540 the light-diffusing layer on the LED panel.
  • the method 500 further comprises the step of providing 530 a coating in a pattern on the light-diffusing layer, wherein the coating is arranged to modify at least one light transmission property of the light-diffusing layer.
  • the step of providing 530 the coating may comprise printing or painting the coating on the light-diffusing layer.
  • the step of providing the coating may further comprises providing 550 the pattern of the index-matching coating in a plurality of stripes arranged in parallel.
  • the step of providing 530 the coating may be performed by ablation.
  • one or more of the LED panel 110, the light-diffusing layer 140, etc. may have different shapes, dimensions and/or sizes than those depicted/described.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Optical Elements Other Than Lenses (AREA)

Abstract

A luminaire (100) and a method (500) for producing a luminaire are provided. The luminaire comprises a light emitting diode, LED, panel (110) comprising a plurality of light emitting diodes (120), LEDs, arranged to emit light (130). The luminaire comprises a light-diffusing layer (140) arranged on the LED panel, wherein the light-diffusing layer is configured to diffuse at least a part of the emitted light. The light-diffusing layer comprises a coating (150) arranged in a pattern (160) on the light-diffusing layer, wherein the coating is arranged to modify at least one light transmission property of the light-diffusing layer.

Description

Luminaire with LED panel and method of producing a luminaire
FIELD OF THE INVENTION
The present invention generally relates to luminaires comprising one or more light emitting diodes, LEDs. More specifically, the present invention is related to a luminaire with a LED panel.
BACKGROUND OF THE INVENTION
The use of light emitting diodes (LED) for illumination purposes continues to attract attention. Compared to incandescent lamps, fluorescent lamps, neon tube lamps, etc., LEDs provide numerous advantages such as a longer operational life, a reduced power consumption, and an increased efficiency related to the ratio between light energy and heat energy.
There is currently a large interest and need for lighting arrangements or luminaires which are less complex than present prior art arrangements, in particular regarding the number of components and the effort at assembly. It will be appreciated that there are numerous advantages associated with lighting arrangements or luminaires which are more structurally convenient and non-complex. For example, by using a minimal number of sourced components, the lighting arrangements or luminaires allow for an easy, convenient and/or diverse assembly, dismantling and/or replacement, an improved cost-efficiency, a more conveniently performed customization, etc.
There is also a desire for lighting arrangements or luminaires which may combine the above-mentioned features of anon-complexity and/or structural convenience with the ability to achieve a desired lighting distribution and/or an aesthetical appearance of the light emitted.
Hence, it is an object of the present invention to combine the advantageous properties of LEDs, the advantageous aspects of a lighting arrangement or luminaire which is convenient and non-complex in its structure, and the possibility to provide a desired lighting distribution and/or an aesthetical appearance of the light emitted from the lighting arrangement or luminaire. SUMMARY OF THE INVENTION
It is of interest to combine the advantageous properties of LEDs, the advantages of a lighting arrangement or luminaire which is convenient and non-complex in its construction or structure, and an emission of light which satisfies a desired lighting distribution and/or aesthetical appearance.
This and other objects are achieved by providing a luminaire and a method having the features in the independent claim. Preferred embodiments are defined in the dependent claims.
Hence, according to the first aspect of the present invention, there is provided a luminaire.
The luminaire comprises a light emitting diode, LED, panel comprising a plurality of light emitting diodes, LEDs, arranged to emit light. The luminaire further comprises a light-diffusing layer arranged on the LED panel, wherein the light-diffusing layer is configured to diffuse at least a part of the emitted light.
The luminaire further comprises a coating arranged in a pattern on the light- diffusing layer.
The coating is a transparent index-matching coating having a refractive index that corresponds to a refractive index of the light-diffusing layer. Such a coating is arranged to modify at least one light transmission property of the light-diffusing layer.
According to the second aspect of the present invention, there is provided a method for producing a luminaire.
The method comprises the step of providing a light emitting diode, LED, panel comprising a plurality of light emitting diodes, LEDs, arranged to emit light. The method further comprises the step of providing a light-diffusing layer on the LED panel, wherein the light-diffusing layer is configured to diffuse at least a part of the emitted light. The method further comprises the step of providing a coating in a pattern on the light-diffusing layer, wherein the coating is a transparent index-matching coating having a refractive index that corresponds to a refractive index of the light-diffusing layer, so that the coating is arranged to modify at least one light transmission property of the light-diffusing layer.
Thus, the present invention is based on the idea of a luminaire which combines a LED panel and a light-diffusing layer arranged thereon comprising a pattern coating for modifying property(ies) of the light-diffusing layer. The luminaire is convenient and noncomplex in its structure whilst being able to achieve a desired lighting distribution and/or an aesthetical appearance of the light emitted from the luminaire by a patterned light emission appearance and/or light patterns.
The present invention is advantageous in its convenience of achieving a patterned light emission appearance by modifying the light-diffusing layer of the luminaire. Consequently, the luminaire is easily and conveniently customizable.
The present invention is further advantageous in that the convenience of the luminaire implies a cost-efficient arrangement as such, e.g. concerning the bill of materials. Furthermore, the convenience of the luminaire, notably by the relatively few components, leads to a cost-efficient assembly thereof. Hence, the luminaire provides cost-efficiency regarding material and/or manufacturing aspects.
It will be appreciated that the luminaire of the present invention comprises relatively few components. The relatively low number of components is advantageous in that the luminaire is relatively inexpensive to fabricate. Moreover, the relatively low number of components of the luminaire implies an easier recycling, especially compared to devices or arrangements comprising a relatively high number of components which impede an easy disassembling and/or recycling operation.
The luminaire according to the present invention comprises a light emitting diode, LED, panel comprising a plurality of light emitting diodes, LEDs, arranged to emit light. By the term “LED panel”, it is here meant e.g. a LED tile, a ledinaire, a (ceiling) panel, or the like. Hence, the LED panel is preferably arranged, mounted and/or installed in a ceiling, on a wall, or the like. The luminaire further comprises a light-diffusing layer arranged on the LED panel, wherein the light-diffusing layer is configured to diffuse at least a part of the emitted light. By the term “light-diffusing layer”, it is here meant a relatively thin piece of material in the form of a layer, foil, plate, or the like, which is configured or arranged to at least partially diffuse light incident on the layer.
A coating is arranged in a pattern on the light-diffusing layer. Hence, the luminaire comprises a coating which at least partially coats or covers a surface portion of the light-diffusing layer, wherein the coating is arranged in a pattern (e.g. a structure, configuration, etc.).
The coating is arranged to modify at least one light transmission property of the light-diffusing layer. Hence, the coating is arranged or configured to modify, change and/or influence one or more light transmission properties of the light-diffusing layer. More specifically, the coating is arranged or configured to modify the transmission of the light- diffusing layer, either by increasing the transmission and/or by decreasing the transmission via the pattern.
The coating is an index-matching coating, wherein a refractive index of the index-matching coating corresponds to a refractive index of the light-diffusing layer.
By the term “index-matching coating”, it is here meant a coating which has a refractive index which is the same, or almost the same, as the material or element it coats or covers. Hence, the index-matching coating may have a first refractive index, ni, and the lightdiffusing layer may have a second refractive index, m, wherein m = , or at least m ~ .
The index-matching coating enhances (increases) the transmission of the light- diffusion layer. At the locations where the index-matching coating is provided on the lightdiffusion layer, the light diffusing properties of the light-diffusion layer are essentially compensated by the index-matching coating. Because the index-matching coating is transparent, these locations will be transparent rather than diffusive. This has the advantage that an improved and/or more customized pattern is achieved by the coating. Consequently, an improved lighting distribution and/or aesthetical appearance of the light from the luminaire is obtained.
As an alternative, the coating may be a light-scattering coating arranged to scatter the emitted light. The light-scattering coating may reduce (decrease) the transmission of the light-diffusing layer, or in other terms, that the light-scattering coating may increase (enhance) the reflection of the light-diffusing layer. The alternative allows an improved and/or customized pattern to be achieved by the coating. Consequently, an improved lighting distribution and/or aesthetical appearance of the light from the luminaire may be obtained.
According to an embodiment of the present invention, the coating may comprise one of a foil, a paint, and a print. The present embodiment is advantageous in that the coating in the form of a foil, a paint or a print provides a convenient and easily formed structure of the luminaire. The present embodiment is further advantageous in that the coating in the form of a foil or a print may be produced separately from the (other components of the) luminaire, and thereafter be applied to the light-diffusing layer of the luminaire, which may lead to an even more convenient luminaire arrangement and/or production.
According to an embodiment of the present invention, the light-diffusing layer may be arranged on the LED panel via lamination. The present embodiment is advantageous in that lamination provides a relatively easy and efficient manner of providing the lightdiffusing layer on the LED panel. According to an embodiment of the present invention, the pattern of the coating may comprise a plurality of stripes arranged in parallel.
According to an embodiment of the present invention, the coating may cover 10-40 % of an area, AT, of the light-diffusing layer.
According to an embodiment of the present invention, the luminaire may comprise a mixing chamber arranged between the LED panel and the light-diffusing layer, wherein the mixing chamber is arranged to mix at least a part of the emitted light. The present embodiment is advantageous in that the mixing chamber may mitigate light losses of the luminaire. More specifically, the mixing chamber is configured to mix the emitted light for a recycling of the light after leaving the LED panel.
According to an embodiment of the second aspect of the present invention, the step of providing the coating may comprise one of printing and painting the coating on the light-diffusing layer. The present embodiment is advantageous in that the step of printing or painting the coating on the light-diffusing layer even further simplifies the manufacturing process of the luminaire.
Alternatively, a coating may be provided by ablation. By (locally) modifying the coating by ablation (e.g. via an ablation laser), the pattern of the coating may be provided conveniently. Ablation may be used to enhance the reflection of the light-diffusing layer.
According to an embodiment of the second aspect of the present invention, the step of providing the light-diffusing layer on the LED panel may comprise laminating the light-diffusing layer on the LED panel.
According to an embodiment of the second aspect of the present invention, the step of providing the coating may comprise providing the pattern in a plurality of stripes arranged in parallel.
According to an embodiment of the second aspect of the present invention, the step of providing the coating may comprise covering 10-40 % of an area, AT, of the light- diffusing layer with the coating.
Further objectives of, features of, and advantages with, the present invention will become apparent when studying the following detailed disclosure, the drawings and the appended claims. Those skilled in the art will realize that different features of the present invention can be combined to create embodiments other than those described in the following. BRIEF DESCRIPTION OF THE DRAWINGS
This and other aspects of the present invention will now be described in more detail, with reference to the appended drawings showing embodiment(s) of the invention.
Fig. la schematically shows a luminaire according to an exemplifying embodiment of the present invention,
Fig. lb schematically shows a portion of a luminaire according to an exemplifying embodiment of the present invention,
Figs. 2a-d schematically show a luminaire and its nominal operation, Figs. 3a-d and 4a-d schematically show a luminaire and its operation according to exemplifying embodiments of the present invention, and
Fig. 5 schematically shows a method for producing a luminaire according to an exemplifying embodiment of the present invention.
DETAILED DESCRIPTION
Fig. la schematically shows a luminaire 100 according to an exemplifying embodiment of the present invention. The luminaire 100 comprises a light emitting diode, LED, panel 110 comprising a plurality of light emitting diodes, LEDs, arranged to emit light. The LED panel 110 is exemplified as having a rectangular (square) shape in cross-section, but it should be noted that other forms are also feasible. The LED panel 110 in Fig. 1 is embodied as a LED tile, a ledinaire, a (ceiling) panel, or the like, and the (relatively flat) LED panel 110 may preferably be arranged, mounted and/or installed in a ceiling or on a wall. The LED panel 110 has a homogeneous diffuse emission pattern. The luminaire 100 further comprises a light-diffusing layer 140 arranged on the LED panel 110. The lightdiffusing layer 140 may, for example, be arranged on the LED panel 110 via lamination. The light-diffusing layer 140 is configured to diffuse at least a part of the emitted light 130. The light-diffusing layer 140 comprises a coating 150 arranged in a pattern 160 on the light- diffusing layer 140. The coating 150 may, for example, be in the form of a foil, a paint or a print. The coating 150 is arranged to modify at least one light transmission property (e.g. light transmission, light reflection, etc.) of the light-diffusing layer 140.
In Fig. la, at a schematically indicated, leftmost part, A, of the luminaire 100, an operation of the luminaire 100 without any coating is indicated, wherein the emitted light 130, impinging the light-diffusing layer 140, is partly transmitted, T, and partly reflected, R. At a schematically indicated, central part, B, of the luminaire 100, the light-diffusing layer 140 of the luminaire 100 comprises a coating 150 arranged in a pattern 160. It will be appreciated that the pattern 160 may have substantially any form or configuration, and is merely presented in Fig. la as an example. The coating 150 is exemplified as an indexmatching coating 152, wherein a refractive index of the index-matching coating 152 corresponds to a refractive index of the light-diffusing layer 140. The index-matching coating 152 results in a (locally) enhanced transmission, T, of the emitted light 130 during operation of the luminaire 100. In Fig. la, at a schematically indicated, rightmost part, C, of the luminaire 100, an operation of the luminaire 100 with a coating 150 in form of a lightscattering coating 154 is indicated. The light-scattering coating 154 results in a (locally) enhanced reflection, R, of the emitted light 130 during operation of the luminaire 100.
Fig. lb schematically shows a portion of a luminaire 100 according to an exemplifying embodiment of the present invention. At the schematically indicated part, D, of the luminaire 100, the emitted light 130 is reflected and refracted at the facetted surface of the light-diffusing layer 140 of the luminaire 100. At the schematically indicated part, E, of the luminaire 100, the coating 150 is exemplified as an index-matching coating 152, wherein a refractive index, m, of the index-matching coating 152 corresponds to a refractive index, m, of the light-diffusing layer 140. Hence, the index-matching coating 152 has a refractive index, m, which is the same, or almost the same, as the refractive index, , of the lightdiffusing layer 140, wherein m = m, or at least m ~ . The index-matching coating 152 may hereby enhance (increase) the transmission of the light-diffusion layer 140 by decreasing (eliminating) reflection and refraction ad the facetted surface of the light-diffusing layer 140 of the luminaire 100.
Figs. 2a-d schematically show a luminaire 100 and its nominal operation. The luminaire 100 has dimensions 600 x 600 x 50 mm. The light-diffusing layer 140 has a thickness of 3 mm. The luminaire 100 comprises 36 LEDs, arranged in a grid of 6 x 6 LEDs, wherein the illuminance of each LED is 100 Im. The reflectivity is 49 %, the transmission is
49 % and the absorption in the light-diffusing layer is 2 %. The (total) emitted light 130 of the luminaire 100 is shown in Fig. 2b, wherein the x-axis represents the width of the illumination device 100 and the y-axis represents the height of the illumination device 100. Fig. 2c schematically indicates the operation of the luminaire 100 and the emitted light 130 thereof. An observer (indicated by an eye 220), looking straight into the luminaire 100, as shown in Fig. 2c, perceives the emitted light 130 of the luminaire 100 as shown in Fig. 2d.
Figs. 3a-d schematically show a luminaire 100 and its nominal operation. Analogously with the luminaire 100 of Fig. 2a, the luminaire 100 has dimensions 600 x 600 x
50 mm, wherein the light-diffusing layer 140 has a thickness of 3 mm. The luminaire 100 comprises 36 LEDs, arranged in a grid of 6 x 6 LEDs, wherein the illuminance of each LED is 100 Im. The reflectivity is 49 %, the transmission is 49 % and the absorption in the light- diffusing layer is 2 %. The luminaire 100 schematically shows a coating 150 according to an exemplifying embodiment of the present invention. The coating 150 is arranged in a pattern 160, wherein the pattern 160 comprises a plurality of stripes 170a arranged in parallel. In this example, the five stripes 170a of an index-matching coating have the dimensions 500 x 50 mm, and cover 35 % of an area, AT, of the light-diffusing layer 140 of the luminaire 100. The (total) emitted light 130 of the luminaire 100 is shown in Fig. 3b, wherein the x-axis represents the width of the illumination device 100 and the y-axis represents the height of the illumination device 100. Fig. 3c schematically indicates the operation of the luminaire 100 and the emitted light 130 thereof. An observer (indicated by an eye 220), looking straight into the luminaire 100, as shown in Fig. 3c, perceives the emitted light 130 of the luminaire 100 as shown in Fig. 3d. According to this example, the total output of the emitted light 130 is increased from 2670 Im to 2717 Im, and the stripes 170a will appear darker than the surrounding.
Figs. 4a-d schematically show a luminaire 100 and its nominal operation. Analogously with the luminaire 100 of Figs. 2a and 3a, the luminaire 100 has dimensions 600 x 600 x 50 mm, wherein the light-diffusing layer 140 has a thickness of 3 mm. The luminaire 100 comprises 36 LEDs, arranged in a grid of 6 x 6 LEDs, wherein the illuminance of each LED is 100 Im. The reflectivity is 94 %, the transmission is 4 % and the absorption in the light-diffusing layer is 2 %. The luminaire 100 schematically shows a coating 150 according to an exemplifying embodiment of the present invention. The coating 150 is arranged in a pattern 160, wherein the pattern 160 comprises a plurality of stripes 170b arranged in parallel. In this example, the five stripes 170b of an index-matching coating have the dimensions 500 x 20 mm, and cover 14 % of an area, AT, of the light-diffusing layer 140 of the luminaire 100. The (total) emitted light 130 of the luminaire 100 is shown in Fig. 4b, wherein the x-axis represents the width of the illumination device 100 and the y-axis represents the height of the illumination device 100. Fig. 4c schematically indicates the operation of the luminaire 100 and the emitted light 130 thereof. An observer (indicated by an eye 220), looking straight into the luminaire 100, as shown in Fig. 4c, perceives the emitted light 130 of the luminaire 100 as shown in Fig. 4d. According to this example, the total output of the emitted light 130 is decreased from 2670 Im to 1288 Im. The reflective coating 150 reduces locally the light output, and the stripes 170b will appear significantly brighter than the surrounding. It should be noted that by an increased width of the stripes 170b, the total output of the emitted light 130 may be increased during operation of the illumination device 100.
It should be noted that the illumination device 100 of the present invention as exemplified in Figs. 3a-d and 4a-d may comprise many different (alternative) configurations, and that many opportunities for customization are envisioned. For example, the coating 150 arranged in the pattern 160 (e.g. the stripes 170a, 170b) may appear darker or brighter than their surroundings. The appearance will be dependent on the viewing angle of an observer, and a 3D depth effect can furthermore be expected.
Fig. 5 schematically shows a method 500 for producing a luminaire according to an exemplifying embodiment of the present invention. The method 500 comprises the step of providing 510 a light emitting diode, LED, panel comprising a plurality of light emitting diodes, LEDs, arranged to emit light. The method 500 further comprises the step of providing 520 a light-diffusing layer on the LED panel, wherein the light-diffusing layer is configured to diffuse at least a part of the emitted light. The step of providing 520 the light-diffusing layer on the LED panel may comprise laminating 540 the light-diffusing layer on the LED panel. The method 500 further comprises the step of providing 530 a coating in a pattern on the light-diffusing layer, wherein the coating is arranged to modify at least one light transmission property of the light-diffusing layer. The step of providing 530 the coating may comprise printing or painting the coating on the light-diffusing layer. The step of providing the coating may further comprises providing 550 the pattern of the index-matching coating in a plurality of stripes arranged in parallel. Furthermore, the step of providing 530 the coating may be performed by ablation.
The person skilled in the art realizes that the present invention by no means is limited to the preferred embodiments described above. On the contrary, many modifications and variations are possible within the scope of the appended claims. For example, one or more of the LED panel 110, the light-diffusing layer 140, etc., may have different shapes, dimensions and/or sizes than those depicted/described.

Claims

CLAIMS:
1. A luminaire (100), comprising a light emitting diode, LED, panel (110) comprising a plurality of light emitting diodes (120), LEDs, arranged to emit light (130), a light-diffusing layer (140) arranged on the LED panel (110) and configured to diffuse at least a part of the emitted light, and a coating (150) arranged in a pattern (160) on the light-diffusing layer (140), wherein the coating (150) is a transparent index-matching coating (152) having a refractive index that corresponds to a refractive index of the light-diffusing layer (140).
2. The luminaire (100) according to claim 1, wherein the coating (150) comprises one of a foil, a paint, and a print.
3. The luminaire (100) according to any one of the preceding claims, wherein the light-diffusing layer (140) is arranged on the LED panel (110) via lamination.
4. The luminaire (100) according to any one of the preceding claims, wherein the pattern (160) of the coating (150) comprises a plurality of stripes (170a, 170b) arranged in parallel.
5. The luminaire (100) according to any one of the preceding claims, wherein the coating (150) covers 10-40 % of an area, AT, of the light-diffusing layer (140).
6. The luminaire (100) according to any one of the preceding claims, further comprising a mixing chamber (200) arranged between the LED panel (110) and the lightdiffusing layer (140), wherein the mixing chamber (200) is arranged to mix at least a part of the emitted light.
7. A method (500) of producing a luminaire (100), comprising the steps of: providing (510) a light emitting diode, LED, panel (110) comprising a plurality of light emitting diodes (120), LEDs, arranged to emit light (130), providing (520) a light-diffusing layer (140) on the LED panel (110), wherein the light-diffusing layer (140) is configured to diffuse at least a part of the emitted light, and providing (530) a coating (150) in a pattern on the light-diffusing layer (140), wherein the coating (150) is a transparent index-matching coating (152) having a refractive index that corresponds to a refractive index of the light-diffusing layer (140).
8. The method according to claim 7, wherein the step of providing the coating (150) comprises one of printing and painting the coating (150) on the light-diffusing layer (140).
9. The method according to any one of claims 7-8, wherein the step of providing the light-diffusing layer (140) on the LED panel (110) comprises laminating (540) the lightdiffusing layer (140) on the LED panel (110).
10. The method according to any one of claims 7-9, wherein the step of providing the coating (150) comprises providing (550) the pattern in a plurality of stripes (170) arranged in parallel.
11. The method according to any one of claims 7-10, wherein the step of providing the coating (150) comprises covering 10-40 % of an area, AT, of the light-diffusing layer (140) with the coating (150).
EP24700266.0A 2023-01-13 2024-01-09 Luminaire with led panel and method of producing a luminaire Pending EP4649263A1 (en)

Applications Claiming Priority (2)

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EP23151455 2023-01-13
PCT/EP2024/050396 WO2024149759A1 (en) 2023-01-13 2024-01-09 Luminaire with led panel and method of producing a luminaire

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US7937865B2 (en) * 2006-03-08 2011-05-10 Intematix Corporation Light emitting sign and display surface therefor
US20070289180A1 (en) * 2006-05-30 2007-12-20 Jeff Johnson Light box
WO2015095189A1 (en) * 2013-12-19 2015-06-25 Bright View Technologies Corporation 2d deglaring diffusers increasing axial luminous intensity
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