WO2014129644A1 - 面発光装置 - Google Patents
面発光装置 Download PDFInfo
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- WO2014129644A1 WO2014129644A1 PCT/JP2014/054428 JP2014054428W WO2014129644A1 WO 2014129644 A1 WO2014129644 A1 WO 2014129644A1 JP 2014054428 W JP2014054428 W JP 2014054428W WO 2014129644 A1 WO2014129644 A1 WO 2014129644A1
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- WIPO (PCT)
- Prior art keywords
- light
- plate
- guide plate
- light guide
- emitting device
- Prior art date
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/004—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles
- G02B6/0043—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles provided on the surface of the light guide
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0058—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide
- G02B6/0061—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide to provide homogeneous light output intensity
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
- G02B6/0068—Arrangements of plural sources, e.g. multi-colour light sources
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
- G02B6/0073—Light emitting diode [LED]
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
- G02B6/0093—Means for protecting the light guide
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- 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
- F21Y2103/00—Elongate light sources, e.g. fluorescent tubes
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
- G02B6/0055—Reflecting element, sheet or layer
Definitions
- the present invention relates to a surface light emitting device using a light guide plate.
- a device using a light guide plate As a surface light emitting device, a device using a light guide plate is widely used, and its structure is as follows. That is, light is incident on the inside of the light guide plate through the end face of the light guide plate from a light source disposed close to one side or two opposite sides of the light guide plate, and the incident light is propagated in the plane of the light guide plate while being transmitted to the light guide plate.
- the light guide plate emits light in a planar shape by being scattered by a provided light scattering portion and taken out to the outside (see, for example, Patent Documents 1 to 3).
- a glass plate or a resin plate such as acrylic is often used alone.
- a light scattering portion is formed on the surface of the light guide plate by a method such as printing a scattering pattern with paint or ink, or engraving with a laser.
- JP 2007-80531 A WO2010 / 150364 Japanese Patent No. 270312
- the present situation is that the surface emitting device using the light guide plate is widely used regardless of whether it is indoors or outdoors.
- the resin plate with low bending rigidity is reinforced by the surface glass, and the light guide plate can be thinned.
- the thickness of the glass plate is reduced, there is almost no influence of weight increase.
- the glass plate excellent in chemical resistance, scratch resistance, and weather resistance sandwiches the resin plate, the resin plate is protected from the external environment. Therefore, chemical resistance, scratch resistance, and weather resistance can be favorably maintained while ensuring sufficient bending rigidity without causing an undue increase in the weight of the light guide plate.
- the adhesive forming the adhesive layer has a large absorption from the ultraviolet region to the visible light short wavelength region (about 450 nm or less) as shown in the transmittance curve of FIG.
- the thickness of the contact bonding layer is 0.4 mm, 0.8 mm, and 1.6 mm is illustrated, respectively, there exists a tendency for absorption to become large as the thickness becomes large.
- the adhesive layer of the light guide plate spreads in a flat shape, the apparent thickness of the adhesive layer is large for light propagating in the light guide plate along the plane direction, and the influence of absorption is necessarily increased. Therefore, when the blue component of the light source is contained in a large amount in the adhesive absorption region, it is difficult to propagate the light into the light guide plate while maintaining the blue emission color emitted from the light source. Thus, there may be a problem that the emission color is greatly different between the light emitted from the light source and the light emitted from the light guide plate.
- the blue component when white light (including all RGB components) is irradiated from the light source and propagated in the light guide plate, the blue component is greatly absorbed due to the influence of the adhesive, and yellow as the light guide progresses. It emits light (combination of R and G), and the color reproducibility of the light from the light source deteriorates.
- Such a problem is considered to be solved by improving the light absorption characteristics of the adhesive and realizing a high transmittance over the entire wavelength range of visible light (substantially 420 nm to 690 nm).
- the adhesive properties and UV resistance properties of the adhesive will be lowered, and it will be necessary to use a special adhesive, which may increase the price.
- an object of the present invention is to reduce as much as possible the difference between the light emission color of the light source and the light emission color of the light guide plate in the surface light emitting device.
- a first invention created to solve the above problems is a surface light emitting device including a light guide plate, and a light source that enters light into the light guide plate from at least one end surface of the light guide plate,
- the light guide plate guides the light propagating through the resin plate and the glass plate fixedly attached to both surfaces of the resin plate via an adhesive layer made of an adhesive, and the resin plate and the glass plate.
- the light source has a blue center wavelength in a wavelength range of 460 nm or more and 490 nm or less.
- the blue center wavelength of the light source is biased to the longer wavelength side than the wavelength range where absorption by the adhesive is likely to occur. Therefore, absorption by the adhesive is suppressed, and it is possible to prevent a large difference between the light emission color of the light source and the light emission color of the light guide plate.
- a second invention created to solve the above problems is a surface light-emitting device comprising a light guide plate and a light source that enters light into the light guide plate from at least one end surface of the light guide plate,
- the light guide plate includes a resin plate, a glass plate that is tightly fixed to both surfaces of the resin plate via an adhesive, and a light scattering portion that guides the light propagating through the resin plate and the glass plate to the outside.
- the light source has a blue center wavelength in a wavelength range of 440 nm or more and less than 460 nm, and a color temperature is 4000 K or less.
- the blue center wavelength of the light source is included in a wavelength range where absorption by an adhesive is likely to occur, if the color temperature is 4000 K or less (for example, warm white or light bulb color) Since the blue component itself contained in the light source is small, the influence of light absorption by the adhesive is small. That is, even if light of the blue component of the light source is absorbed, it is difficult for the human eye to perceive the decrease of the blue component, and there is no significant difference between the light emission color of the light source and the light emission color of the light guide plate.
- the color temperature for example, warm white or light bulb color
- the light scattering portion is formed on the surface of one of the resin plate and the glass plate and is covered with the adhesive layer.
- the light scattering portion may be provided in an exposed state on the outer surface of the light guide plate, but in this case, the external light is scattered by the scattering portion even when the surface light emitting device is turned off.
- the scattering pattern is easily visible from the outside, and the transparency of the light guide plate is impaired.
- the surface light emitting device is visually recognized as emitting light in the shape of the scattering pattern of the light scattering portion (for example, dot shape), and may deviate from the ideal surface light emission.
- the light scattering portion may be deteriorated by the external environment, which may adversely affect the transparency and light emission state of the light guide plate.
- the scattering pattern of the light scattering part is engraved on the surface of the light guide plate made of a resin plate by a laser, if the light scattering part continues to be exposed to the external environment, the surface of the resin plate damaged by the laser irradiation heat is deteriorated. Almost progresses, and the deterioration of the transparency of the light guide plate becomes remarkable.
- the light scattering portion is covered with the adhesive layer and is not exposed to the external environment, so that the light scattering portion is prevented from deteriorating. be able to.
- the light scattering portion covered with the adhesive layer is less scattered by external light, it is difficult to visually recognize from the outside, and the transparency of the light guide plate can be ensured satisfactorily.
- the light scattered by the light scattering portion spreads evenly before reaching the surface of the light guide plate. As a result, the entire surface of the light guide plate corresponding to the light scattering portion tends to be visually recognized as emitting light in a planar shape.
- the light scattering portion is covered with the adhesive layer, but since there is a difference in refractive index between the adhesive layer and the light scattering portion, sufficient scattering occurs at the interface of the light scattering portion, and the light scattering function is maintained.
- the light scattering portion is preferably formed on the surface of the resin plate.
- the resin plate is more workable than the glass plate, the light scattering portion can be easily formed, and the manufacturing cost can be reduced.
- the light scattering portion may be formed by pattern-printing a paint or ink containing a light scattering agent on one surface of the resin plate or the glass plate.
- the thickness of the resin plate is preferably larger than the thickness of the glass plate.
- the light guide plate can be suitably reduced in weight.
- the thickness of the glass plate is preferably 0.05 mm to 1 mm.
- the light source is preferably an LED.
- the difference between the light emission color of the light source and the light emission color of the light guide plate can be reduced as much as possible, and the light emission color of the light source can be reproduced well by the light guide plate. it can.
- the surface light emitting device includes a light guide plate 1, a light source 2 that guides light from one end face of the light guide plate 1 into the light guide plate 1, and a light source 2 inside. And a housing 3 that is externally fitted to the one side of the light guide plate 1 in the accommodated state.
- the light guide plate 1 is a light that guides the light from the resin plate 11, the glass plate 12 that is tightly fixed to both surfaces of the resin plate 11, and the light source 2 that propagates inside the resin plate 11 and the glass plate 12.
- the scattering unit 13 is provided.
- the resin plate 11 is reinforced by the glass plate 12, and the resin plate 11 is protected from the external environment by the glass plate 12. Therefore, good properties such as chemical resistance, scratch resistance, and weather resistance derived from the glass plate 12 can be exhibited while improving bending rigidity without causing an unreasonable increase in weight.
- the resin plate 11 and the glass plate 12 are integrated, the work of assembling the light guide plate 1 to the housing 3 becomes extremely simple. Since the assembly of the light guide 1 to the housing 3 is often performed at an actual installation site, labor saving in field work can be achieved.
- the light guide plate 1 has a structure in which both surfaces of the resin plate 11 are sandwiched between the glass plates 12, the light source plate 1 is deteriorated by heat as compared with the case where the light guide plate 1 is constituted by the resin plate 11 alone. It is thought that it can be suppressed. This is because it can be expected that the glass plate 12 can suppress the deformation of the resin plate 11 due to heat and that the heat radiation can be realized through the glass plate 12 that is more excellent in heat conduction than the resin plate 11.
- the resin plate 11 and the glass plate 12 are closely fixed via an adhesive layer 14 made of an adhesive.
- the light scattering portion 13 is covered with the adhesive layer 14 while being formed on one surface of the resin plate 11. That is, the light scattering portion 13 is in close contact with the resin plate 11 and the adhesive layer 14 without being exposed to the outside.
- the resin plate 11 is transparent to visible light (for example, the transmittance is 90% or more over the entire wavelength range of 420 nm to 690 nm in the working thickness).
- examples of the resin plate 11 include acrylic, polycarbonate, PET (polyethylene terephthalate), PP (polypropylene), COP (cycloolefin polymer), and urethane.
- the glass plate 12 is transparent to visible light (for example, the transmittance is 90% or more over the entire wavelength range of 420 nm to 690 nm in the use thickness).
- examples of the glass plate 12 include soda glass, borosilicate glass, alkali-free glass, quartz glass, lead glass, crystallized glass, and the like.
- what is generally called white plate glass is suitable. .
- the plate thickness of the glass plate 12 is smaller than the plate thickness of the resin plate 11.
- the thickness of the glass plate 12 is preferably 0.05 mm to 1 mm, more preferably 0.07 mm to 0.5 mm, and further preferably 0.1 mm to 0.3 mm. preferable.
- the plate thickness of the glass plate 12 is 1 mm or less, flexibility appears in the glass plate 12. Therefore, when an impact is applied to the light guide plate 1 from the outside, the glass plate 12 is bent and deformed so as to follow the bending deformation of the resin plate 11 serving as the core material. As a result, even if the glass plate 12 is a thin plate, it is difficult to break.
- the adhesive constituting the adhesive layer 14 since there is a large difference in thermal expansion coefficient between the resin plate 11 and the glass plate 12, an adhesive having a degree of elasticity that can absorb the difference in thermal expansion between the two is preferable.
- a room temperature curing type or an energy curing type for example, an ultraviolet curing type
- a thermoplastic type or a thermosetting type is used for a hot melt adhesive sheet.
- examples of the hot-melt adhesive sheet include EVA (ethylene vinyl acetate copolymer) and TPU (thermoplastic polyurethane).
- An adhesive adhesive such as an optical transparent adhesive sheet can also be used.
- the light scattering portion 13 is formed by printing a dot pattern on the surface of the resin plate 11 with a paint or ink containing a light scattering agent made of a transparent or colored pigment, for example. .
- the dot pattern is configured such that the size of the dot increases as the distance from the light source 2 increases. Thereby, even if light attenuation (decrease in intensity) increases as the distance from the light source 2 increases, light propagating in the light guide plate 1 tends to scatter as the distance from the light source 2 increases. Uniform light emission can be realized in the entire scattering portion 13. The same effect can be obtained even if the number of dots is arranged densely as the distance from the light source 2 increases instead of changing the dot size.
- the light scattering portion 13 thus formed on the surface of the resin plate 11 is completely covered with the adhesive layer 14 and is not exposed to the external environment, the light scattering portion 13 can be prevented from deteriorating. it can. Further, since the light scattering portion 13 covered with the adhesive layer 14 is embedded in the adhesive layer 14, scattering due to external light is reduced. As a result, it becomes difficult to visually recognize the light scattering portion 13 from the outside, and the transparency of the light guide plate 1 can be secured satisfactorily. Furthermore, since a sufficient distance is ensured from the light scattering portion 13 to the surface of the light guide plate 1, the light scattered by the light scattering portion 13 spreads evenly before reaching the surface of the light guide plate 1. Therefore, the entire surface of the light guide plate 1 corresponding to the light scattering portion 13 tends to be visually recognized as emitting light in a planar shape instead of a dot shape.
- the light scattering portion 13 may be formed on the surface of the glass plate 12 facing the adhesive layer 14.
- the light scattering portion 13 is not limited to one side of the resin plate 11 and may be formed on both sides.
- the scattering patterns of the light scattering portions 13 on both sides of the resin plate 11 are preferably plane symmetric with each other.
- the light scattering unit 13 may be configured by, for example, engraving a linear pattern with a laser or engraving an uneven pattern with sand blasting instead of printing a dot pattern. Even in these cases, it is preferable that the density of the scattering pattern gradually increases as the distance from the light source 2 increases.
- the light scattering portion 13 may be formed on the entire surface of the light guide plate 1 or only on a part thereof. In the former case, since the entire surface of the light guide plate 1 emits light, it is suitable for illumination or the like. In the latter case, for example, if the light scattering portion 13 is formed only in a region corresponding to a character or an illustration, the character or the illustration is lit and displayed, and a light emitting display device (for example, a signboard such as a guide board or a welcome board) Etc.).
- a light emitting display device for example, a signboard such as a guide board or a welcome board
- the light source 2 is arranged in plural along one side of the light guide plate 1 as shown in FIG.
- a plurality of light sources 2 may be arranged along each of the two opposing sides of the light guide plate 1.
- the light source 2 is composed of LEDs from the viewpoint of low power consumption and low heat generation.
- the light source 2 in addition to the LED, for example, a fluorescent tube, a cold cathode tube (CCFL), a hot cathode tube (HCFL), an external electrode tube (EEFL), a plasma lamp, or the like can be applied.
- Two single-chip LEDs with a phosphor 25 on the light emitting surface side can be applied.
- a single-chip type white LED for example, a blue phosphor is covered with a yellow phosphor to reproduce a white emission color
- a multi-chip type white LED for example, an RGB LED is turned on simultaneously to emit white light. Reproduce the color.
- the light source 2 has a blue center wavelength in a wavelength range of 460 nm or more and 490 nm or less.
- the adhesive forming the adhesive layer 14 has a blue center even when there is absorption from the ultraviolet region to the visible light short wavelength region (about 450 nm or less) as shown in the transmittance curve of FIG.
- the wavelength is biased to the longer wavelength side than the absorption wavelength region by the adhesive layer 14. Therefore, absorption by the adhesive layer 14 is suppressed, and the difference between the light emission color of the light guide plate 1 and the light emission color of the light source 2 can be reduced. Therefore, even if a versatile and inexpensive adhesive is used, the light emission color of the light source 2 can be reproduced by the light guide plate 1 without any problem.
- the above-mentioned multi-chip type LED has a blue center wavelength of about 460 nm to 470 nm, so that the above condition is easily satisfied.
- R represents the spectrum of the red LED
- G represents the spectrum of the green LED
- B represents the spectrum of the blue LED.
- the blue LED used for the above-mentioned single-chip LED has a blue center wavelength of about 440 nm or more and less than 460 nm (see FIG. 7), but the blue center wavelength is 460 nm or more and 490 nm or less. If this is used, the above conditions can be satisfied as in the case of a multichip LED.
- the surface light emitting device according to the second embodiment differs from the surface light emitting device according to the first embodiment in the configuration of the light source.
- the light source 2 has a blue center wavelength in the wavelength range of 440 nm or more and less than 460 nm, and the color temperature thereof is 4000 K or less.
- the color temperature is 4000 K or less (for example, warm white or light bulb color). Since the blue component itself contained in the light source 2 is small, the influence of light absorption by the adhesive layer 14 is small. That is, even if light of the blue component of the light source 2 is absorbed, it is difficult for the human eye to perceive the decrease of the blue component, and there is a large difference between the light emission color of the light source 2 and the light emission color of the light guide plate 1. There is no.
- the blue LED used for the single-chip LED is mainly one having a blue center wavelength of 440 nm or more and less than 460 nm, but the peak size of the blue center wavelength differs depending on the color temperature.
- the peak of the blue component is the green component in the visible light wavelength range when the color temperature is about 6000 K. And larger than the peak of the red component.
- the color temperature is about 4000K, the peak of the blue component is significantly reduced.
- the blue center wavelength is in the wavelength range of 440 nm or more and less than 460 nm (preferably 445 nm or more and 455 nm or less) and the color temperature is 4000 K or less (preferably 3000 K or less corresponding to the light bulb color)
- absorption by the adhesive is performed.
- the blue component contained in the generated wavelength range is suppressed in advance. Therefore, if it is single chip type LED, the light source 2 which satisfies the said conditions can be prepared easily.
- the peak of the blue component is preferably smaller than the peaks of the green component and the red component. In FIG. 7, it has a maximum peak near 620 nm.
- the above conditions may be satisfied by a multichip LED.
- the surface light emitting device according to the third embodiment is different from the surface light emitting devices according to the first and second embodiments in that a functional coat 15 is formed on the surface of the glass plate 12. is there.
- Examples of the functional coat 15 include a total reflection film (mirror) made of a metal film or a dielectric film. In this way, since the scattered light in the light guide plate 1 is not emitted to the outside by reflection on the functional coat 15 side, only one side opposite to the functional coat 15 emits light, which is suitable for illumination and the like. .
- the total reflection film may be white. In this case, the light guide plate 1 becomes a white plate when the light is extinguished.
- the functional coat 15 may be composed of a half mirror.
- the transmittance with the half mirror By adjusting the transmittance with the half mirror, the ratio of the amount of light emitted to both surfaces of the light guide plate 1 can be changed, so that various effects can be produced and the design is improved.
- a planar light emitting device configured using a light guide plate 1 on which a half mirror with relatively low transmittance is formed is used as a wall material, the opposite side of the wall can be visually recognized because it is a half mirror when turned off.
- light is emitted in one direction and the opposite side of the wall cannot be seen. That is, the presence / absence of visibility on the opposite side of the wall can be appropriately switched.
- this surface light emitting device When this surface light emitting device is used as epi-illumination for attaching to the ceiling, the interior of the room is directly illuminated from the lower surface side of the light guide plate 1 by the incident light, and at the same time the ceiling located on the upper surface side of the light guide plate 1 by the half mirror. Can also illuminate, resulting in highly designed lighting.
- a white reflective film can be applied as the half mirror.
- the functional coat 15 may include a total transmission part (no mirror), a total reflection part (total reflection mirror), and a partial transmission part (half mirror). In this way, the light emission characteristics can be adjusted at various locations on the light emitting surface, and various effects including the display of characters and illustrations can be achieved.
- the functional coat 15 may be a transmission film having wavelength selectivity. Thereby, when a surface light-emitting device is used as illumination, harmful light and unnecessary light can be blocked by the wavelength selective transparency. For example, when used as illumination for a plant factory, light having a green wavelength range that is harmful to plants is cut by the functional coat 15 and irradiated.
- the functional coat 15 is provided on the adhesive layer 14 side of the glass plate 12. It is preferable to form on the surface. However, when the functional coat 15 is an antifouling coat or the like, it is preferably formed on the outer surface side of the glass plate 12 and positioned on the outermost surface of the light guide plate 1.
- the functional coat 15 is preferably formed on the smooth surface of the glass plate 12 from the viewpoint of film formation accuracy, but may be formed on the surface of the resin plate 11.
- the function of the functional coat 15 described above may be imparted to the adhesive layer 14. In this way, it is not necessary to separately form the functional coat 15.
- this invention is not limited to the said embodiment, A various deformation
- the case where the light scattering portion 13 is formed on the surface of the resin plate 11 or the inner surface of the glass plate 12 on the adhesive layer 14 side is described, but it is formed on the outer surface of the glass plate 12. It may be. In this case, the light emission state of the light guide plate 1 tends to be bright.
- the planar light guide plate 1 has been described, but the light guide plate 1 may have a curved shape.
- a curved glass plate may be bonded to the curved resin plate, or the curved resin plate may be attached to the surface thereof.
- the flat glass plate may be bonded together while being deformed.
- the light guide plate 1 has been described with respect to the case where the light emitting function is the main function, but a touch panel function may be added to the light guide plate 1.
- a touch sensor function may be imparted to the resin plate 11 used for the light guide plate 1, and a sheet having the touch sensor function is additionally inserted into the adhesive layer between the resin plate 11 and the glass plate 12.
- the surface glass may be directly provided with a touch sensor function.
- a resistance film method, a capacitance method, or the like is adopted as a touch panel detection method.
- Example 1 (1) Size and shape: 400 mm ⁇ 400 mm flat plate (2) Resin plate: 5 mm thick acrylic plate (3) Glass plate: 0.2 mm thick alkali-free glass (4) Adhesive layer: 0.4 mm thick EVA (5) Light source: Single chip type white LED (blue center wavelength 450 nm, color temperature 3000 K) (6) Light scattering part: dot printing on one whole surface of the resin plate (7) Functional coating: none A double-sided light emission type window was produced by the above (1) to (7). Its feature is that it functions as a transparent window when turned off, and becomes a wall that emits white light when turned on. Moreover, the color reproduction of the luminescent color of the light source by a light-guide plate was also favorable.
- Example 2 Size and shape: 800 mm x 800 mm flat plate (2) Resin plate: 5 mm thick acrylic plate (3) Glass plate: 0.2 mm thick non-alkali glass (4) Adhesive layer: 0.4 mm thick TPU (5) Light source: Single chip type white LED (blue center wavelength 450 nm, color temperature 3000 K) (6) Light scattering portion: Screen printing of dot pattern on one whole surface of resin plate (7) Functional coating: Total reflection mirror is formed at the central portion on the bonding surface side of one glass plate, A half mirror having a transmittance of 50% was formed in the range of the width of the contour portion of 100 mm. The epi-illumination was produced as described above (1) to (7).
- the feature is that the lower side is illuminated by the total reflection mirror on the back side, and at the same time, light is transmitted to the back side by the half mirror formed around it, and the ceiling is illuminated like a frame. Moreover, the color reproduction of the luminescent color of the light source by a light-guide plate was also favorable.
- Example 3 (1) Size and shape: 300 mm ⁇ 600 mm flat plate (2) Resin plate: 5 mm thick acrylic plate (3) Glass plate: 0.3 mm thick non-alkali glass (4) Adhesive layer: 0.3 mm thick optically transparent Adhesive sheet (5) Light source: Multi-chip type (RGB type) white LED (blue center wavelength 468 nm, color temperature 6500 K) (6) Light scattering portion: dot printing on one entire surface of the resin plate (7) Functional coating: none By the above (1) to (7), a Walcom board on which characters were described was produced. The feature is that the character color can be changed by switching the emission color of the light source to white, blue, green, red or the like. Moreover, the color reproduction of the luminescent color of the light source by a light-guide plate was also favorable.
- Example 4 (1) Size and shape: 600 mm ⁇ 600 mm flat plate (2) Resin plate: 5 mm thick acrylic plate (3) Glass plate: 0.1 mm thick non-alkali glass (4) Adhesive layer: 0.3 mm thick optically transparent Adhesive sheet (5) Light source: Multi-chip type (RGB type) white LED (blue center wavelength 468 nm, color temperature 6500 K) (6) Light scattering portion: Screen printing of dot pattern on one entire surface of resin plate (7) Functional coating: Total reflection mirror is formed on the bonding surface side of one glass plate, and the bonding surface of the other glass plate Forming a wavelength selective transmission film that cuts the green wavelength on the side The epi-illumination for a plant factory was produced as described above in (1) to (7).
- the feature is that light is emitted only to the plant side by the total reflection mirror on the back side, and light in a wavelength range (green) harmful to plants is cut by the wavelength selective transmission film on the front side. Moreover, the color reproduction of the luminescent color of the light source by a light-guide plate was also favorable.
- Example 5 (1) Size and shape: 300 mm ⁇ 100 mm flat plate (2) Resin plate: 1 mm thick polycarbonate plate (3) Glass plate: 0.1 mm thick borosilicate glass (4) Adhesive layer: 0.1 mm thick optically transparent Adhesive sheet (5) Light source: Single-chip white LED (blue center wavelength 460 nm, color temperature 5000K) (6) Light scattering part: A linear pattern is engraved on the entire surface of one side of the resin plate by a laser. (7) Functional coating: The bonding surface side of one glass plate is coated in white. (1) to (7) Thus, a stand lamp for a desk was produced. Its feature is that it is thin and lightweight and has excellent design. Moreover, the color reproduction of the luminescent color of the light source by a light-guide plate was also favorable.
- Example 6> Size and shape: 800 mm ⁇ 1000 mm flat plate (2) Resin plate: 8 mm thick acrylic plate (3) Glass plate: 0.3 mm thick non-alkali glass (4) Adhesive layer: 0.6 mm thick TPU (5) Light source: Multi-chip type (RGB type) white LED (blue center wavelength 468 nm, color temperature 6500K) (6) Light scattering part: Screen printing of dot pattern on one whole surface of resin plate (7) Functional coating: None Large-sized wall by connecting a plurality of planar light emitting devices consisting of (1) to (7) above Was made. Its feature is that it is transparent when it is turned off, and the color and the atmosphere of the wall can be changed by switching on and off the RGB. Moreover, the color reproduction of the luminescent color of the light source by a light-guide plate was also favorable.
- Example 7 (1) Size and shape: 600 mm ⁇ 900 mm, semi-cylindrical plate having a curvature of 2000 mm (2) Resin plate: 5 mm thick acrylic plate (3) Glass plate: 0.2 mm thick alkali-free glass (4) Adhesive layer: thickness 0.4mm TPU (5) Light source: Single-chip white LED (blue center wavelength 455 nm, color temperature 3000 K) (6) Light scattering part: Screen printing of dot pattern on one whole surface of resin plate (7) Functional coating: None The surface light emitting device comprising the above (1) to (7) is formed in a box shape made of a transparent resin plate It was installed on the ceiling of the space and used as lighting.
- Its feature is that it is a space having a transparent wall including the illumination part when it is turned off, but the illumination part emits light when illuminated to illuminate the interior of the space. Moreover, the color reproduction of the luminescent color of the light source by a light-guide plate was also favorable.
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Abstract
Description
図1に示すように、第1実施形態に係る面発光装置は、導光板1と、導光板1の一辺の端面から導光板1の内部に光を誘導する光源2と、光源2を内部に収容した状態で導光板1の前記一辺側に外嵌されるハウジング3とを備える。
第2実施形態に係る面発光装置が、第1実施形態に係る面発光装置と相違する点は、光源の構成にある。
図8に示すように、第3実施形態に係る面発光装置が、第1~2実施形態に係る面発光装置と相違するところは、ガラス板12の表面に機能性コート15を形成した点にある。
(1)サイズ及び形状:400mm×400mmの平板
(2)樹脂板:厚み5mmのアクリル板
(3)ガラス板:厚み0.2mmの無アルカリガラス
(4)接着層:厚み0.4mmのEVA
(5)光源:シングルチップ式白色LED(青色中心波長450nm、色温度3000K)
(6)光散乱部:樹脂板の一方の表面全体にドットパターンをスクリーン印刷
(7)機能性コート:なし
以上(1)~(7)により、両面発光型の窓を作製した。その特徴は、消灯時は透明窓として機能し、点灯時は白色に発光する壁となる点である。また、導光板による光源の発光色の色再現も良好であった。
(1)サイズ及び形状:800mm×800mmの平板
(2)樹脂板:厚み5mmのアクリル板
(3)ガラス板:厚み0.2mmの無アルカリガラス
(4)接着層:厚み0.4mmのTPU
(5)光源:シングルチップ式白色LED(青色中心波長450nm、色温度3000K)
(6)光散乱部:樹脂板の一方の表面全体にドットパターンをスクリーン印刷
(7)機能性コート:一方のガラス板の接着面側の中央部に全反射ミラーを形成し、その中央部の輪郭部の幅100mmの範囲に透過率50%のハーフミラーを形成
以上(1)~(7)により、落射照明を作製した。その特徴は、背面側の全反射ミラーによって下方を照らすと同時に、その周囲に形成されたハーフミラーによって背面側に光を透過させ、天井部を枠状に照らす点である。また、導光板による光源の発光色の色再現も良好であった。
(1)サイズ及び形状:300mm×600mmの平板
(2)樹脂板:厚み5mmのアクリル板
(3)ガラス板:厚み0.3mmの無アルカリガラス
(4)接着層:厚み0.3mmの光学透明粘着シート
(5)光源:マルチチップ式(RGB式)白色LED(青色中心波長468nm、色温度6500K)
(6)光散乱部:樹脂板の一方の表面全体にドットパターンをスクリーン印刷
(7)機能性コート:なし
以上(1)~(7)により、文字が記載されたウォルカムボードを作製した。その特徴は、光源の発光色を白・青・緑・赤などに切り替えることで、文字色を変更できる点にある。また、導光板による光源の発光色の色再現も良好であった。
(1)サイズ及び形状:600mm×600mmの平板
(2)樹脂板:厚み5mmのアクリル板
(3)ガラス板:厚み0.1mmの無アルカリガラス
(4)接着層:厚み0.3mmの光学透明粘着シート
(5)光源:マルチチップ式(RGB式)白色LED(青色中心波長468nm、色温度6500K)
(6)光散乱部:樹脂板の一方の表面全体にドットパターンをスクリーン印刷
(7)機能性コート:一方のガラス板の接着面側に全反射ミラーを形成し、他方のガラス板の接着面側に緑色の波長をカットする波長選択透過膜を形成
以上(1)~(7)により、植物工場用の落射照明を作製した。その特徴は、背面側の全反射ミラーで植物側へのみ光を放出させ、前面側の波長選択透過膜により植物に有害な波長域(緑色)の光をカットする点である。また、導光板による光源の発光色の色再現も良好であった。
(1)サイズ及び形状:300mm×100mmの平板
(2)樹脂板:厚み1mmのポリカーボネート板
(3)ガラス板:厚み0.1mmのホウケイ酸ガラス
(4)接着層:厚み0.1mmの光学透明粘着シート
(5)光源:シングルチップ式白色LED(青色中心波長460nm、色温度5000K)
(6)光散乱部:樹脂板の一方の表面全体にレーザにより線状パターンを刻設
(7)機能性コート:一方のガラス板の接着面側を白色にコート
以上(1)~(7)により、机用のスタンド照明を作製した。その特徴は、薄型且つ軽量でデザイン性に優れている点にある。また、導光板による光源の発光色の色再現も良好であった。
(1)サイズ及び形状:800mm×1000mmの平板
(2)樹脂板:厚み8mmのアクリル板
(3)ガラス板:厚み0.3mmの無アルカリガラス
(4)接着層:厚み0.6mmのTPU
(5)光源:マルチチップ式(RGB式)白色LED(青色中心波長468nm、色温度6500K)
(6)光散乱部:樹脂板の一方の表面全体にドットパターンをスクリーン印刷
(7)機能性コート:なし
以上(1)~(7)からなる面状発光装置を複数連結して大型の壁を作製した。その特徴は、消灯時は透明であり、RGBを切り替えて点灯・点滅させることで壁の色や雰囲気を変更できる点にある。また、導光板による光源の発光色の色再現も良好であった。
(1)サイズ及び形状:600mm×900mmで、曲率2000mmの半円筒板
(2)樹脂板:厚み5mmのアクリル板
(3)ガラス板:厚み0.2mmの無アルカリガラス
(4)接着層:厚み0.4mmのTPU
(5)光源:シングルチップ式白色LED(青色中心波長455nm、色温度3000K)
(6)光散乱部:樹脂板の一方の表面全体にドットパターンをスクリーン印刷
(7)機能性コート:なし
以上(1)~(7)からなる面発光装置を、透明樹脂板製のボックス状空間の天井部に設置し、照明として利用した。その特徴は、消灯時は照明部も含めて全面透明な壁を有する空間であるが、点灯により照明部が発光して空間内を照らす点にある。また、導光板による光源の発光色の色再現も良好であった。
(1)サイズおよび形状:300mm×600mmの平板
(2)樹脂板:厚み5mmのアクリル板
(3)ガラス板:厚み0.2mmの無アルカリガラス
(4)接着層:厚み0.3mmの光学透明粘着シート
(5)光源:シングルチップ式白色LED(青色中心波長450nm、色温度6500K)
(6)光散乱部:樹脂板の一方の表面全体にドット印刷パターンをスクリーン印刷
(7)機能性コート:なし
以上(1)~(7)からなる両面発光型の窓を作製し、600mm長の方向に片側からエッジライトを入光させたが、導光の進行するにつれて可視光短波長(青系色)の吸収が顕著となり、導光長が300mmを超えたあたりから発光色が黄色味を呈した。
2 光源
3 ハウジング
11 樹脂板
12 ガラス板
13 光散乱部
14 接着層
15 機能性コート
Claims (8)
- 導光板と、前記導光板の少なくとも一端面から光を前記導光板内に入射する光源とを備えた面発光装置であって、
前記導光板が、樹脂板と、前記樹脂板の両面のそれぞれに接着剤からなる接着層を介して密着固定されたガラス板と、前記樹脂板と前記ガラス板の内部を伝搬する光を外部に誘導する光散乱部とを備え、
前記光源が、460nm以上490nm以下の波長範囲に青色中心波長を有することを特徴とする面発光装置。 - 導光板と、前記導光板の少なくとも一端面から光を前記導光板内に入射する光源とを備えた面発光装置であって、
前記導光板が、樹脂板と、前記樹脂板の両面に接着剤を介して密着固定されたガラス板と、前記樹脂板と前記ガラス板の内部を伝搬する光を外部に誘導する光散乱部とを備え、
前記光源は、440nm以上460nm未満の波長範囲に青色中心波長を有し、色温度が4000K以下であることを特徴とする面発光装置。 - 前記光散乱部が、前記樹脂板と前記ガラス板のいずれか一方の表面に形成されると共に、前記接着層で覆われていることを特徴とする請求項1又は2に記載の面発光装置。
- 前記光散乱部が、前記樹脂板の表面に形成されていることを特徴とする請求項1~3のいずれか1項に記載の面発光装置。
- 前記光散乱部が、前記樹脂板と前記ガラス板のいずれか一方の表面に、光散乱剤を含有する塗料又はインクをパターン印刷することにより形成されていることを特徴とする請求項1~4のいずれか1項に記載の面発光装置。
- 前記樹脂板の板厚が、前記ガラス板の板厚よりも大きいことを特徴とする請求項1~5のいずれか1項に記載の面発光装置。
- 前記ガラス板の板厚が、0.05mm~1mmであることを特徴とする請求項1~6のいずれか1項に記載の面発光装置。
- 前記光源が、LEDであることを特徴とする請求項1~7のいずれか1項に記載の面発光装置。
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EP14753713.8A EP2960568A4 (en) | 2013-02-25 | 2014-02-25 | Surface light-emitting device |
US14/769,899 US20160011360A1 (en) | 2013-02-25 | 2014-02-25 | Surface light-emitting device |
CN201480007367.4A CN104968994A (zh) | 2013-02-25 | 2014-02-25 | 面发光装置 |
KR1020157020739A KR102149157B1 (ko) | 2013-02-25 | 2014-02-25 | 면 발광 장치 |
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EP (1) | EP2960568A4 (ja) |
JP (1) | JP6084483B2 (ja) |
KR (1) | KR102149157B1 (ja) |
CN (1) | CN104968994A (ja) |
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WO2018105365A1 (ja) | 2016-12-07 | 2018-06-14 | セントラル硝子株式会社 | 導光板、面発光装置及び導光板の製造方法 |
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KR20150125927A (ko) | 2015-11-10 |
US20160011360A1 (en) | 2016-01-14 |
TW201443374A (zh) | 2014-11-16 |
TWI688730B (zh) | 2020-03-21 |
KR102149157B1 (ko) | 2020-08-28 |
JP6084483B2 (ja) | 2017-02-22 |
EP2960568A4 (en) | 2017-01-04 |
CN104968994A (zh) | 2015-10-07 |
JP2014164989A (ja) | 2014-09-08 |
EP2960568A1 (en) | 2015-12-30 |
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