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WO2016207045A1 - Surface émettrice d'éclairage - Google Patents

Surface émettrice d'éclairage Download PDF

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Publication number
WO2016207045A1
WO2016207045A1 PCT/EP2016/063783 EP2016063783W WO2016207045A1 WO 2016207045 A1 WO2016207045 A1 WO 2016207045A1 EP 2016063783 W EP2016063783 W EP 2016063783W WO 2016207045 A1 WO2016207045 A1 WO 2016207045A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
emitting surface
light emitting
phosphor layer
over
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.)
Ceased
Application number
PCT/EP2016/063783
Other languages
English (en)
Inventor
Vincent Stefan David Gielen
René Jan HENDRIKS
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.)
Koninklijke Philips NV
Original Assignee
Koninklijke Philips NV
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 Koninklijke Philips NV filed Critical Koninklijke Philips NV
Priority to KR2020187000003U priority Critical patent/KR20180000593U/ko
Publication of WO2016207045A1 publication Critical patent/WO2016207045A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
    • H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
    • H10H20/80—Constructional details
    • H10H20/85—Packages
    • H10H20/851—Wavelength conversion means
    • H10H20/8514—Wavelength conversion means characterised by their shape, e.g. plate or foil
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
    • H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
    • H10H20/80—Constructional details
    • H10H20/85—Packages
    • H10H20/851—Wavelength conversion means
    • H10H20/8511—Wavelength conversion means characterised by their material, e.g. binder
    • H10H20/8512—Wavelength conversion materials
    • 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
    • F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
    • F21V9/30—Elements containing photoluminescent material distinct from or spaced from the light source
    • F21V9/32—Elements containing photoluminescent material distinct from or spaced from the light source characterised by the arrangement of the photoluminescent material
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F13/00—Illuminated signs; Luminous advertising
    • G09F13/20—Illuminated signs; Luminous advertising with luminescent surfaces or parts
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
    • H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
    • H10H20/01—Manufacture or treatment
    • H10H20/036—Manufacture or treatment of packages
    • H10H20/0361—Manufacture or treatment of packages of wavelength conversion means
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
    • H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
    • H10H20/80—Constructional details
    • H10H20/81—Bodies
    • H10H20/819—Bodies characterised by their shape, e.g. curved or truncated substrates
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
    • H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
    • H10H20/80—Constructional details
    • H10H20/85—Packages
    • H10H20/851—Wavelength conversion means
    • H10H20/8516—Wavelength conversion means having a non-uniform spatial arrangement or non-uniform concentration, e.g. patterned wavelength conversion layer or wavelength conversion layer with a concentration gradient
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
    • H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
    • H10H20/80—Constructional details
    • H10H20/85—Packages
    • H10H20/855—Optical field-shaping means, e.g. lenses
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/60—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
    • F21K9/64—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer

Definitions

  • This invention relates to a light emitting surface having a low spectral bandwidth light source arrangement and a phosphor layer.
  • indicator lights e.g. a battery life indicator on a shaver
  • logos e.g. a company logo on a wake-up light
  • Many techniques are available to achieve this aesthetic effect, e.g. screen printing labels which are lit from the back, or selective laser ablation of lacquer layers.
  • a shaver cover for instance can have 4 layers of lacquer, of which the first two act as a light mask for the light source behind it (e.g. in the shape of a logo or function indicator) and the top two act as a masking finish to make the partially removed first two layers invisible.
  • a transparent foil 10 has a phosphor layer 12 on one side, and a black top coat 14 on the other side.
  • the phosphor layer is illuminated by an array of LEDs 16.
  • the black top coat 14 has a laser engraved pattern 18 through which wavelength-converted light passes. It is also possible to provide a pattern in the phosphor layer so that some non-wavelength converted light can also pass through aligned pattern openings in the top coat 14.
  • Fig. 3 shows an example of the manufacturing method used to create the structure of Fig. 1.
  • a first set of lacquer layers 30 is applied to the transparent substrate 10.
  • Laser ablation is used to create the pattern 18 in the layers 30, following which a second lacquer layer 32 (or set of second lacquer layers) is applied on one side and the LEDs on the other side.
  • US20100301360A1 discloses a lighting device comprising a semiconductor LED configured to emit light having a first peak wavelength upon the application of a voltage thereto, an element in adjacent, spaced-apart relationship with the LED, and a pattern of discrete lumiphor- containing regions on a surface of, or within, the element.
  • This prior art provides a method and structure for lighting, but obviously, it cannot achieve the above mentioned purpose.
  • a light emitting surface comprising:
  • a patterned phosphor layer of a pattern over an upper face of the substrate which defines light output portions, leaves uncovered substrate portions, and is adapted to emit a patterned light according to the pattern of the phosphor layer when the light emitting surface is turned on to deliver information with its pattern;
  • a translucent cover layer over the light output portions and over the uncovered substrate portions, which is adapted to shield the pattern in the phosphor layer when the light emitting surface is turned off, and display the patterned light when the light emitting surface is turned on;
  • a low spectral bandwidth light source arrangement for illuminating a lower face of the substrate.
  • This arrangement provides illumination from one side of a substrate.
  • the light reaching the phosphor layer light output portions is wavelength-converted and the wavelength-converted light escapes through the cover layer.
  • the non-converted light from the light source arrangement is either blocked by the cover layer or has a much lower final output intensity, so that the visible light output corresponds to the shape of the patterned phosphor layer.
  • This pattern may for example be an image, a logo, or a function indicator. It excludes one situation that the phosphor layer shows some patterns formed naturally during the manufacturing or only for manufacturing purpose. Good directional control of the light output from the phosphor layer portions can be achieved.
  • low spectral bandwidth is meant a narrow band of wavelengths, for example a full wave half maximum (FWHM) spectral bandwidth of less than 50nm, for example less than 40nm, for example less than 30nm.
  • FWHM full wave half maximum
  • the light source arrangement is essentially a single color device, and the wavelength is converted by the phosphor layer.
  • Semiconductor LEDs typically have a FWHM wavelength spread in the range 20nm to 30nm, but other solid state light sources may be envisaged.
  • the translucent layer shields the phosphor layer so that when the light source arrangement is turned off, the pattern in the phosphor layer is not visible or is hardly visible. When the light source is turned on, the pattern becomes visible.
  • Translucency is for example caused by scattering of light inside the material of the cover layer, for example using embedded scattering particles.
  • AI2O3 particles may be embedded in
  • the size of the particles influences the scattering properties.
  • the wavelength - converted light (longer wavelengths) passes through the cover layer and the shorter non- converted wavelength light (e.g. blue) from the light source is absorbed as much as possible by the cover layer (more scattering leads to more absorption). This makes the pattern visible by providing contrast between the patterned area and the area outside the phosphor layer pattern.
  • a blue light source such as a blue LED
  • a light source may be used that has a spectral emission less visible to the human eye such as UV.
  • the patterned phosphor layer does not require light masking (because the light is converted only in the pattern). This creates an effective light source in close contact to the top cover layer (or layers). Therefore a smaller light source can be used than in conventional masking techniques. Also, blue LEDs can be used to excite the phosphors instead of white LEDs which are less efficient, boosting battery life.
  • the phosphor layer for example comprises a phosphorescent ink. This means the phosphor layer may be printed, which provides a low cost option with few manufacturing steps, particularly if the cover layer is a non-patterned layer.
  • the light source arrangement is for example spaced from the substrate.
  • the cover layer can better block the transmission of the light which is not wavelength- converted by the phosphor layer.
  • the phosphor layer generates lower frequency light (i.e. longer wavelength) directly against the cover layer.
  • the cover layer may have the same structure and thickness over the light output portions and the uncovered substrate portions.
  • cover layer to be formed as a non-patterned layer (or set of layers), for example a lacquer or multiple lacquer layers. This provides a simple
  • the cover layer is thinner over the light output portions than over the uncovered substrate portions.
  • the cover layer may have a greater transmission for the light output from the light output portions than for the light source arrangement light output.
  • the cover layer may perform a wavelength-dependent filtering function to block the original light source light output but allow the passage of the phosphor- converted light. This can be achieved using scattering particles as mentioned above.
  • the cover layer may comprise a paint or a transparent layer with embedded scattering particles.
  • paints that use synthetic polymers such as acrylic, vinyl acrylic (PVA), styrene acrylic, etc. as binders may be used.
  • the dimensions of the phosphor layer portions are typically of mm-scale (e.g. lettering on shavers).
  • the vertical spacing from the phosphor layer to the light source arrangement is also typically of mm-scale.
  • the lateral spacing between the LEDs is again of mm-scale.
  • a typical thickness of the phosphor layer is in the ⁇ -scale (such as 10-
  • the thickness of the cover layer is also for example in the ⁇ -scale (such as 10- 200 ⁇ ).
  • the thickness of the substrate is for example in the mm-scale (such as 0.5-3mm).
  • the phosphor layer may comprise:
  • a multiple-color image may be generated.
  • color addition may be used to generate different colors.
  • layers may overlap in some areas (for color addition) and they may not overlap in other areas (for individual color generation).
  • the light emitting surface may further comprise one or more color filter layers provided over the phosphor layer.
  • Color filter layers may be used to provide different colors by color subtraction, for example from a white light output from the phosphor layer. These color filter layers may comprise printable inks, and they may partially overlap so that different color subtraction functions may be performed in different areas.
  • the phosphor layer for example has a light intensity time decay curve. This enables time-dependent lighting effects to be implemented, such as gradual color transitions between an on state and an off state.
  • Examples in accordance with another aspect of the invention provide a method of manufacturing a light emitting surface, comprising:
  • a phosphor layer of a pattern over an upper face of a substrate to define light output portions, leave uncovered substrate portions and be adapted to emit a patterned light according to the phosphor layer (42) when the light emitting surface is turned on to deliver information with its pattern;
  • a translucent cover layer over the light output portions and over the uncovered substrate portions, which is adapted to shield the pattern in the phosphor layer when the light emitting surface is turned off, and display the patterned light when the light emitting surface is turned on;
  • Fig. 1 shows a known light emitting surface
  • Fig. 2 shows the directional light output from the light emitting surface of Fig. i ;
  • Fig. 3 shows a method of manufacturing the light emitting surface of Fig. 1 ;
  • Fig. 4 shows a first example of light emitting surface according to the invention;
  • Fig. 5 shows the directional light output from the light emitting surface of Fig.
  • Fig. 6 shows a method of manufacturing the light emitting surface of Fig. 4
  • Fig. 7 shows a second example of light emitting surface according to the invention.
  • Fig. 8 shows two examples of patterned output which can be creating using the light emitting surface of Fig. 4 or Fig. 7.
  • the invention provides a light emitting surface, comprising a substrate, a patterned phosphor layer over an upper face of the substrate, which defines light output portions and which leaves uncovered substrate portions, and a translucent cover layer over the light output portions and over the uncovered substrate portions.
  • a low spectral bandwidth light source arrangement illuminates a lower face of the substrate.
  • Fig. 4 shows a light emitting surface in accordance with an example of the invention. It comprises a transparent substrate 40 and a patterned phosphor layer 42 over an upper face of the substrate, which defines light output portions 44 and which leaves uncovered substrate portions 46.
  • a translucent cover layer 48 is over the light output portions and over the uncovered substrate portions.
  • the cover layer 48 is preferably not patterned at all. Furthermore there is preferably no sub-layer of the cover layer which needs to be patterned after deposition.
  • a light source arrangement 50 is provided for illuminating a lower face of the substrate.
  • the light source arrangement is preferably an LED arrangement, with the
  • LEDs emitting a narrow spectral bandwidth, i.e. essentially a single color.
  • Other low spectral bandwidth light sources may be used.
  • the LED light source arrangement for example comprises blue LEDs.
  • the non-converted blue light from the LED light source arrangement is either blocked by the cover layer or has a much lower final output intensity, so that the visible light output corresponds to the shape of the patterned phosphor layer 42.
  • This pattern may for example be an image, a logo, or a function indicator. It excludes one situation that the phosphor layer shows some shapes formed naturally during the manufacturing or only for manufacturing purpose.
  • Fig. 4 shows the desired light output direction control as arrow 52.
  • Fig. 5 shows the directional control that can be achieved in practice. Good directional control is possible because of the proximity of the phosphor layer to the cover layer and because the phosphor layer can be very thin.
  • the cover layer 48 has a scattering effect so there will be some scattering to the light passing through the cover layer.
  • the translucent cover layer 48 shields the phosphor layer 42 so that when the LED light source arrangement 50 is turned off, the pattern in the phosphor layer is not visible or is hardly visible. The pattern only becomes visible with the LEDs on.
  • the translucency is for example caused by scattering of light inside the material of the cover layer, for example using embedded scattering particles.
  • AI2O3 particles may be embedded in polycarbonate. The size of the particles influences the scattering properties.
  • the wavelength - converted light (longer wavelengths) passes through the cover layer with much less absorption that the shorter non-converted wavelength light.
  • a light source may be used that has a spectral emission less visible to the human eye such as UV.
  • the phosphor layer preferably comprises a phosphorescent ink.
  • the phosphor layer has a Lambertian emission, but it is possible to create a virtual light source with limited scattering using the phosphor layer. This will have a similar effect to an LED positioned directly underneath an aperture. In the case of an aperture, created by laser ablation, and multiple LEDs, the light from more than one LED can pass through the aperture and thus create more scattering. This is avoided by using a patterned phosphor. Furthermore, the sides of the aperture also create a scattering effect.
  • the effect of creating a virtual light source by means of a phosphorescent ink has a further benefit in that it requires only one type of LED, i.e. blue LEDs, but with different output colors using different phosphors, without the detrimental effect of color mixing, since each LED is effectively at the output surface.
  • Fig. 6 shows an example of a manufacturing method in accordance with the invention.
  • the patterned phosphor layer 42 is printed over an upper face of the substrate 40 to define the light output portions and to leave uncovered substrate portions.
  • the translucent cover layer 48 is formed over the light output portions and over the uncovered substrate portions. As shown in Fig. 5, it may comprise multiple layers.
  • the LED light source arrangement 50 is provided on the opposite face for illuminating the lower face of the substrate 40.
  • the printing of the phosphor layer provides a low cost option with few manufacturing steps, particularly if the cover layer is a non-patterned layer.
  • the LEDs are mounted on the lower side of the substrate.
  • the LED light source arrangement 50 may instead be spaced from the substrate 40. The spacing of "d” is shown in Fig. 7.
  • the phosphor layer 42 generates lower frequency light (i.e. longer wavelength) directly against the cover layer.
  • the cover layer 48 may have the same structure and thickness over the light output portions and the uncovered substrate portions as shown. This enables the cover layer to be formed as a non-patterned layer (or set of layers), for example a lacquer or multiple lacquer layers. This provides a simple manufacturing process.
  • the cover layer may be thinner over the light output portions than over the uncovered substrate portions. This would for example be the case by planarizing the top (for example as shown in Fig. 5). However, this planarizing step would not need to be patterned nor would the cover layer need to be deposited to different thicknesses. This enables the original LED light to be attenuated even further compared to the light generated in the phosphor layer to ensure that the original LED light output is less visible through the substrate.
  • the cover layer may comprise a paint or a transparent layer with embedded scattering particles.
  • paints that use synthetic polymers such as acrylic, vinyl acrylic (PVA), styrene acrylic, etc. as binders may be used.
  • the dimensions of the phosphor layer portions are typically of mm-scale (e.g. lettering on shavers).
  • the vertical spacing to the LEDs is also typically of mm-scale.
  • the lateral spacing between the LEDs is again of mm-scale.
  • a typical thickness of the phosphor layer is in the ⁇ -scale (such as 10- ⁇ ).
  • the thickness of the cover layer is also for example in the ⁇ -scale (such as 10- 200 ⁇ ).
  • the thickness of the substrate is for example in the mm-scale (such as 0.5-3mm).
  • the phosphor layer may comprise:
  • a multiple-color image may be generated.
  • color addition may be used to generate different colors.
  • layers may overlap in some areas (for color addition) and they may not overlap in other areas (for individual color generation).
  • the light emitting surface may further comprise one or more color filter layers provided over the phosphor layer.
  • Color filter layers may be used to provide different colors by color subtraction, for example from a white light output from the phosphor layer. These color filter layers may comprise printable inks, and they may partially overlap so that different color subtraction functions may be performed in different areas.
  • the phosphor layer for example has a light intensity time decay curve. This enables time-dependent lighting effects to be implemented, such as gradual color transitions between an on state and an off state. For example by utilizing slow phosphors that release the converted light in a slowly decaying fashion, more aesthetic effects like fade-outs can be created; By combining slow phosphors and fast phosphors, color transitions can be created in the on-state to off-state, further increasing possibilities for aesthetic effects.
  • a light emitting surface may use a single LED or an array of LEDs. Typically, it may form part of the outer surface of a product.
  • the cover layer may comprise a single layer or a set of layers, and similarly the phosphor layer may comprise on or more layers.
  • the substrate 10 may be transparent so that as much light reaches the phosphor layer as possible. However, it may also be scattering or else it may instead perform another optical function such as beam shaping.
  • the invention is of particular interest for domestic appliances (e.g. coffee makers, shavers, etc.), lighting systems (e.g. consumer luminaires, wake-up lights, etc.) and automotive systems (e.g. dashboard lighting, indicator lights integrated in the body work) that have function indictors, signal lights, luminous surfaces, logos and/or aesthetic markings in combination with light sources.
  • domestic appliances e.g. coffee makers, shavers, etc.
  • lighting systems e.g. consumer luminaires, wake-up lights, etc.
  • automotive systems e.g. dashboard lighting, indicator lights integrated in the body work
  • function indictors e.g. signal lights, luminous surfaces, logos and/or aesthetic markings in combination with light sources.
  • the light may provide a logo or information.
  • Fig. 8 shows two examples of light output shape.
  • the image 60 is a warning sign, for example indicating that a heart rate is dangerously high.
  • the image 62 is a heart symbol which may for example flash at the measured heart rate.

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  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Illuminated Signs And Luminous Advertising (AREA)
  • Led Device Packages (AREA)

Abstract

L'invention concerne une surface électroluminescente, comprenant : un substrat (40) ; une couche de substance fluorescente (42) comportant un motif au-dessus d'une face supérieure du substrat, laquelle définit des parties de sortie de lumière (44), laisse apparaître des parties (46) du substrat, et sert à émettre une lumière à motifs selon la couche de substance fluorescente (42) lorsque la surface électroluminescente est activée pour livrer des informations avec son motif ; une couche de couvercle translucide (48) au-dessus de la partie de sortie de lumière et au-dessus des parties du substrat découvertes, qui sert à protéger le motif dans la couche de substance fluorescente lorsque la surface électroluminescente est désactivée, et à afficher la lumière à motif lorsque la surface électroluminescente est activée ; et un agencement de source de lumière à largeur de bande spectrale basse (50) pour l'éclairage d'une face inférieure du substrat.
PCT/EP2016/063783 2015-06-23 2016-06-15 Surface émettrice d'éclairage Ceased WO2016207045A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR2020187000003U KR20180000593U (ko) 2015-06-23 2016-06-15 조명 발광 표면

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP15173316.9 2015-06-23
EP15173316 2015-06-23

Publications (1)

Publication Number Publication Date
WO2016207045A1 true WO2016207045A1 (fr) 2016-12-29

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ID=53476777

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PCT/EP2016/063783 Ceased WO2016207045A1 (fr) 2015-06-23 2016-06-15 Surface émettrice d'éclairage

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KR (1) KR20180000593U (fr)
WO (1) WO2016207045A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0525211A1 (fr) * 1991-02-19 1993-02-03 MORIYAMA, Hirofumi Element lumineux et peinture
US20100301360A1 (en) * 2009-06-02 2010-12-02 Van De Ven Antony P Lighting devices with discrete lumiphor-bearing regions on remote surfaces thereof
US20130249388A1 (en) * 2012-03-22 2013-09-26 Sharp Kabushiki Kaisha Light source, light-emitting device, light source for backlight, display device, and method for producing light source
US20140133128A1 (en) * 2012-11-14 2014-05-15 Nam Seok Oh Lamp and vehicle lamp apparatus using the same
US20140226335A1 (en) * 2013-02-09 2014-08-14 Phosphortech Corporation Phosphor sheets
US20150102722A1 (en) * 2013-10-10 2015-04-16 Panasonic Corporation Wavelength conversion board and illumination device comprising the same

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0525211A1 (fr) * 1991-02-19 1993-02-03 MORIYAMA, Hirofumi Element lumineux et peinture
US20100301360A1 (en) * 2009-06-02 2010-12-02 Van De Ven Antony P Lighting devices with discrete lumiphor-bearing regions on remote surfaces thereof
US20130249388A1 (en) * 2012-03-22 2013-09-26 Sharp Kabushiki Kaisha Light source, light-emitting device, light source for backlight, display device, and method for producing light source
US20140133128A1 (en) * 2012-11-14 2014-05-15 Nam Seok Oh Lamp and vehicle lamp apparatus using the same
US20140226335A1 (en) * 2013-02-09 2014-08-14 Phosphortech Corporation Phosphor sheets
US20150102722A1 (en) * 2013-10-10 2015-04-16 Panasonic Corporation Wavelength conversion board and illumination device comprising the same

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Publication number Publication date
KR20180000593U (ko) 2018-02-28

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