US20110234941A1 - Light guides - Google Patents

Light guides Download PDF

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Publication number
US20110234941A1
US20110234941A1 US13/125,134 US200913125134A US2011234941A1 US 20110234941 A1 US20110234941 A1 US 20110234941A1 US 200913125134 A US200913125134 A US 200913125134A US 2011234941 A1 US2011234941 A1 US 2011234941A1
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US
United States
Prior art keywords
light
light guide
guide plate
layer
guiding material
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.)
Abandoned
Application number
US13/125,134
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English (en)
Inventor
James Gourlay
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.)
ITI Scotland Ltd
Original Assignee
ITI Scotland Ltd
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Filing date
Publication date
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Assigned to ITI SCOTLAND LIMITED reassignment ITI SCOTLAND LIMITED ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: GOURLAY, JAMES
Publication of US20110234941A1 publication Critical patent/US20110234941A1/en
Abandoned legal-status Critical Current

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Classifications

    • 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
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0016—Grooves, prisms, gratings, scattering particles or rough surfaces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • 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
    • 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
    • G02B6/0041—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles provided in the bulk 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
    • G02B6/0065—Manufacturing aspects; Material aspects
    • 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
    • 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
    • G02B6/007—Incandescent lamp or gas discharge lamp
    • 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]
    • 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
    • G02B6/0075—Arrangements of multiple light guides
    • G02B6/0076—Stacked arrangements of multiple light guides of the same or different cross-sectional area
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133504—Diffusing, scattering, diffracting elements
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/10—Methods of surface bonding and/or assembly therefor

Definitions

  • This invention relates to a light guide plate and a light guide device comprising said light guide plate and methods of manufacture thereof.
  • the light guide device is suitable for use in a range of applications, particularly in connection with the backlighting of displays, for example, liquid crystal displays.
  • a light guiding device comprises a light source such as a fluorescent lamp or a plurality of light emitting diodes (LEDs) and a light guide plate which is constructed from a standard injection-moulded or machined transparent plastic component.
  • a light source such as a fluorescent lamp or a plurality of light emitting diodes (LEDs)
  • LEDs light emitting diodes
  • a light guide plate which is constructed from a standard injection-moulded or machined transparent plastic component.
  • the light guide plate will often comprise suitable structural surface modifications which disturb the total internal reflection of the light from the light source such that the light is guided through the transparent light guide in a controlled manner and emitted in a substantially perpendicular direction to that of the direction of propagation of light within the transparent guide.
  • an injection-moulded light guide comprising these surface features requires a suitable mould to be micro-machined or laser cut, often at great cost.
  • micro-mechanical surface features described may easily be damaged during production of the light guide plate, or during assembly of a light guide device.
  • stringent dust-free production and assembly processes are required to ensure that no dust particles are collected on the surface features, which may have an adverse effect on light propagation through the light guide. Consequently, production costs and assembly process costs are high.
  • a light guide plate comprising a first layer of light guiding material upon a first surface of which is mounted a second layer of light guiding material and one or more light scattering features located at the interface between the first and second layers of light guiding material.
  • a light guide device comprising a light guide plate according to the first aspect of the invention and one or more light sources.
  • the one or more light sources may be coupled externally to the light guide plate.
  • the device is edge-lit.
  • the one or more light sources may not be encapsulated by a layer of light guiding material.
  • Light from the one or more light sources may be guided within both the first layer of light guiding material and the second layer of light guiding material by total internal reflection.
  • the one or more light scattering features may disturb or break the total internal reflection of the guided light and the disturbed light may be emitted in a direction which is perpendicular or substantially perpendicular to the direction of guided light.
  • a light guide device comprising one or more light sources coupled to a light guide plate wherein said light guide plate comprises a first layer of light guiding material upon a first surface of which is mounted a second layer of light guiding material and one or more light scattering features located at the interface between the first and second layers of light guiding material, wherein light from the one or more light sources is guided within both the first layer of light guiding material and the second layer of light guiding material by total internal reflection and said one or more light scattering features disturb the total internal reflection of the guided light and the disturbed light is emitted in a direction which is perpendicular or substantially perpendicular to the direction of guided light.
  • a display device comprising a light guide device according to the second aspect of the invention.
  • the display device may be a liquid crystal display device and may therefore comprise a liquid crystal cell which may also be referred to as a liquid crystal panel.
  • a method of producing a light guide plate comprises:
  • the method may further comprise combining the light guide plate with one or more light sources to form a light guide device.
  • the method may also comprise forming a display device from said light guide device.
  • the method of applying the one or more light scattering features to the first surface of the first layer of light guiding material may comprise applying to the first surface an ink comprising the one or more light scattering features, and curing the ink.
  • the method of applying the ink may comprise printing or stencilling the ink onto a first surface of the first layer of light guiding material.
  • the one or more scattering features may be present on either or both of the first and second layers of light guiding material prior to the layers being combined.
  • the method of combining the first and second layers of light guiding material may comprise applying a liquid polymer to the first surface, and curing the liquid polymer.
  • the second layer of light guiding material may be combined with the first layer of light guiding material using a standard lamination technique. Such a technique may require the use of a transparent adhesive.
  • a light guide plate in accordance with the present invention is easier to clean and has a reduced risk of damage during handling.
  • the one or more light scattering features can be easily applied to the surface of a layer of light guiding material by any additive printing method, such as screen printing, for example, so as to obviate the need for expensive micromachining equipment previously used to create surface-modified structural scattering features, thereby reducing manufacture costs.
  • the light guide plate according to the present invention may be produced using roll-to-roll production.
  • the first and second layers of light guiding material which may also be referred to herein as first and second light guide layers are light transmissive.
  • the light guide layers are transparent to the light generated by the one or more light sources.
  • the first light guide layer (which may be referred to as a substrate layer) may be formed from a transparent polymer sheet such as polyethylene terephthalate (PET), polycarbonate or acrylic.
  • PET polyethylene terephthalate
  • the second light guide layer may be made from a range of suitable polymers, including acrylics, epoxies or urethanes.
  • the thickness of the first and second light guide layers may, independently of each other be about 0.1 to about 10 mm. Typically, the thickness of the light guide layers is of the order of about 0.1 mm.
  • the refractive index of the light guide layers may be equal to or greater than 1.4.
  • the refractive index of the light guide layers may, independently of each other, be selected from about 1.4 to about 1.7.
  • the refractive index of the first layer and the second layer may be the same or may be different.
  • the second light guide layer may be combined with the first guide layer using a standard lamination technique. Such a technique may require use of a transparent adhesive.
  • the transparent adhesive may have a refractive index which is the same or substantially the same as the refractive index of the first and second light guide layers.
  • the first and second light guide layers may be optically joined during manufacture. Optically joined indicates that the layers are combined in such a way that, optically, these layers are effectively indistinguishable.
  • the method of applying the second guide layer to the first guide layer may comprise applying and curing a liquid polymer. Methods of curing may comprise one or more of thermal, UV and/or two-part curing.
  • the method may comprise printing, stencilling or dispensing the liquid polymer.
  • the second light guide layer is applied in the form of a liquid polymer, the one or more scattering features will be disposed on the first light guide layer only, prior to combining the two light guide layers.
  • the one or more light scattering features disturb the total internal reflection of the guided light.
  • the one or more light scattering features may be referred to as light extraction features.
  • the application of the scattering features may be accomplished by dispersing the features in a transparent printing ink and applying the ink to a surface of one or more of the light guide layers prior to the layers being combined.
  • the scattering features are transparent to the light generated by the one or more light sources.
  • the scattering features may be reflective, e.g. silver flakes.
  • the scattering features have a higher refractive index than the refractive index of the first light guide layer and/or second light guide layer, for example, about 1.6 to about 2, for example, greater than about 1.6.
  • the one or more scattering features may be in particulate form.
  • the one or more scattering features may have a particle size in the range of from about 1 ⁇ m to about 20 ⁇ m.
  • Transparent particulate material which has a refractive index greater than the refractive index of the first light guide layer may be suitable for use in the present invention.
  • the particles may be silica particles, e.g. silica spheres.
  • the scattering features may be loaded into an ink.
  • the ink is light transmissive and preferably transparent to the light generated by the one or more light sources.
  • the ink which may be a polymeric material and may comprise the scattering features, may be applied to a light guide layer to form a thin pattern of features, according to any of a number of methods which may be referred to in general terms as additive printing processes.
  • conventional screen printing incorporates the use of a mesh screen with openings corresponding to the pattern required to be printed. This pattern may facilitate the accurate delivery of a volume of ink to the required areas of the light guide layer.
  • Other suitable examples of additive printing methods include stencil printing, ink jet printing, flexographic printing and other known lithographic techniques.
  • Suitable inks for use in the present invention include those which are transparent to light generated from the one or more light sources, have a low refractive index, for example about 1.4 to about 1.5, and which may be UV or solvent cured.
  • the refractive index of the ink may be the same or substantially the same as the refractive index of the first and/or second light guide layer.
  • a suitable UV curing ink is Windowtex Gloss which is an acrylic based, transparent UV curing polymer screen printable ink and is commercially available from MacDermid Autotype.
  • the ink may be applied in varying amounts and shapes which may depend on how close to the one or more light sources the ink is being deposited.
  • the intensity of the light becomes less as the distance from the light source increases if light is scattered out of the light-guide. Therefore, smaller sized ink dots which are more widely spaced may be deposited closer to the position of the light source, whereas larger sized ink dots which are more closely spaced may be deposited as the distance from the light source increases.
  • the ink dots may have a height of from about 0.01 mm to about 0.1 mm and may have a spacing and/or diameter of from about 0.1 mm to about 10 mm.
  • the distribution of ink may be tailored to achieve a uniform or substantially uniform overall extraction of light.
  • the printing pattern of the ink may determine the pattern of the particles on the surface of the light guide layer and therefore the location of the light scattering features.
  • An additional reflective element e.g. a reflective sheet may, optionally, be located below the lower external surface of the first light guide layer in order to re-direct light which would otherwise be directed in a direction significantly away from the direction in which the device is intended to be viewed, for example, when used as a backlight.
  • particle size distribution measurements are measured using a Malvern Particle Size Analyzer, Model Mastersizer, from Malvern Instruments.
  • a helium-neon gas laser beam is projected through a transparent cell which contains the particles suspended in an aqueous solution.
  • Light rays which strike the particles are scattered through angles which are inversely proportional to the particle size.
  • the photodetector array measures the quantity of light at several predetermined angles. Electrical signals proportional to the measured light flux values are then processed by a microcomputer system, against a scatter pattern predicted from theoretical particles as defined by the refractive indices of the sample and aqueous dispersant to determine the particle size distribution.
  • Light guide devices are employed for a range of functions including illumination, backlighting, signage and display purposes.
  • known light guide devices are constructed from an injection moulded or machined transparent plastic component, onto which a light source is integrated by means of mechanical attachment at the edge of the transparent plastic component. Examples of such devices are described in WO 2005/101070, the contents of which are incorporated herein in their entirety by reference.
  • Light guide devices according to the present invention may be made using roll-to-roll production and screen printing techniques.
  • the external surfaces of the light guide plate and light guide device according to the present invention are typically smoother than conventional light guide plates and preferably flat.
  • the integration of one or more light sources to the edge of the light guide plate according to the present invention may be achieved according to a range of techniques.
  • a light source may be integrated by means of mechanical attachment at the edge of the light guide plate.
  • the integration of one or more light sources to the edge of the light guide plate may be achieved by a butt coupling process where the one or more light sources are attached to the end of the light guide plate by UV curing with a high refractive index photonic adhesive that acts to reduce reflections from the ends of the light guide layer.
  • the light guide plate may be hot cleaved or polished to provide a suitable optical surface at the end of the light guide plate which facilitates good coupling of light from the one or more light sources into the light guide layers.
  • the one or more light sources can be any of those known to those skilled in the art, including those which are suitable for use in backlighting.
  • Such light sources include one or more LEDs, cold cathode fluorescent lamps, laser diodes, organic light emitting diode sources, and other electroluminescent devices.
  • the light may be non-directional.
  • the LEDs can be any of the designs known to those skilled in the art, including edge-emitting, side emitting, top emitting or bare die LEDs.
  • the light guide device according to the present invention may be employed for a range of functions including illumination, backlighting, signage and display purposes.
  • a liquid crystal display device operating in a transmissive mode typically comprises a liquid crystal cell, which may also be referred to as a liquid crystal panel, a backlight unit incorporating a light guide device, and one or more polarisers.
  • Liquid crystal cells are also well known devices.
  • liquid crystal cells typically comprise two transparent substrates between which is disposed a layer of liquid crystal material.
  • a liquid crystal display cell may comprise two transparent plates which may be coated on their internal faces respectively with transparent conducting electrodes.
  • An alignment layer may be introduced onto the internal faces of the cell in order that the molecules making up the liquid crystalline material line up in a preferred direction.
  • the transparent plates are separated by a spacer to a suitable distance, for example about 2 microns.
  • the liquid crystal material is introduced between the transparent plates by filling the space in between them by flow filling.
  • Polarisers may be arranged in front of and behind the cell.
  • the backlight unit may be positioned behind the liquid crystal cell using conventional means.
  • a liquid crystal cell operating in a transmissive mode, modulates the light from a light source such as a backlight unit which may comprise a light guide device.
  • FIG. 1 illustrates a light guide device according to the present invention and its effect on the transmission of light.
  • a light guide device ( 1 ) in side elevation comprises a first light guide layer ( 2 ) made from a transparent polymer substrate such as a polyester, polycarbonate or acrylic. Disposed between the first light guide layer and a second light guide layer ( 7 ) are a plurality of scattering features ( 4 ).
  • the second light guide layer may be mounted on the first surface of the first light guide layer by any suitable means known in the art, thereby effectively encapsulating the scattering features between the first and second light guide layers.
  • An external light source ( 3 ) for example an LED, is mechanically attached to one edge of the light guide layers, which together form a light guide plate, by any suitable means.
  • Light ( 5 a, 5 b, 5 c ) generated by the LED light source is coupled into the light guide layers such that it propagates through the light guide layers in a direction substantially parallel to a plane defined by the light guide layers.
  • the light is guided through the transparent light guide plate due to total internal reflection.
  • the scattering features ( 4 ) When the light encounters the scattering features ( 4 ), it interacts with these so as to be redirected and exit the light guide device via the top surface, as indicated at 6 a and 6 c , thereby providing a backlighting function.
  • a reflective element ( 8 ) should it be required to redirect light indicated by ( 5 b ′) through the top of the device and in the general direction indicated by ( 6 b ).
  • the refractive index of the second light guide layer ( 7 ) is substantially equal to the refractive index of the first light guide layer ( 2 ) such that light from the light source ( 3 ) is guided within both the first and second light guide layers due to the effects of total internal reflection. Therefore, the first light guide layer and second light guide layer with the scattering features disposed there between, collectively referred to as the light guide plate, form a composite structure that acts as the guiding media for light generated by the light source mounted on the edge of the light guide plate.
  • a light guide plate in accordance with the present invention is constructed as follows.
  • a 0.3 mm thick sheet of acrylic is used as the first light guide layer.
  • Silica particles particles (particle size: 10 micron) are dispersed in Windowtex Gloss (thickness 0.025 mm), an acrylic based, transparent UV curing polymer screen printable ink which is commercially available from MacDermid Autotype. The resulting dispersion is screen printed onto the acrylic substrate and cured.
  • a 0.1 mm thick layer of Dymax 4-20645, a UV curing, acrylic based transparent polymer (refractive index 1.51) is then applied to the same surface of the acrylic substrate on top of the printed ink and cured, resulting in an optically continuous composite structure with the light scattering silica particles encased at the interface between the two acrylic layers.
  • the top and bottom surfaces of this composite light guide plate are free from features which may become damaged or collect dust and the light scattering features are contained within the composite structure.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Nonlinear Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mathematical Physics (AREA)
  • Planar Illumination Modules (AREA)
  • Light Guides In General And Applications Therefor (AREA)
  • Liquid Crystal (AREA)
US13/125,134 2008-10-21 2009-10-20 Light guides Abandoned US20110234941A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB0819308.8 2008-10-21
GB0819308.8A GB2464916B (en) 2008-10-21 2008-10-21 Light Guides
PCT/GB2009/051409 WO2010046694A1 (en) 2008-10-21 2009-10-20 Light guides

Related Parent Applications (1)

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PCT/GB2009/051409 A-371-Of-International WO2010046694A1 (en) 2008-10-21 2009-10-20 Light guides

Related Child Applications (1)

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US14/667,051 Continuation US9709721B2 (en) 2008-10-21 2015-03-24 Light guides

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US20110234941A1 true US20110234941A1 (en) 2011-09-29

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US14/667,051 Active 2029-10-21 US9709721B2 (en) 2008-10-21 2015-03-24 Light guides

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US (2) US20110234941A1 (enrdf_load_stackoverflow)
EP (1) EP2350524B1 (enrdf_load_stackoverflow)
JP (3) JP2012506608A (enrdf_load_stackoverflow)
KR (2) KR20110081858A (enrdf_load_stackoverflow)
CN (1) CN102197261B (enrdf_load_stackoverflow)
GB (1) GB2464916B (enrdf_load_stackoverflow)
TW (1) TWI507745B (enrdf_load_stackoverflow)
WO (1) WO2010046694A1 (enrdf_load_stackoverflow)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8727567B1 (en) 2012-12-18 2014-05-20 Jds Uniphase Corporation Semiconductor light source having a reflector
US20140346370A1 (en) * 2013-05-23 2014-11-27 Sensor Electronic Technology, Inc. Reflective Transparent Optical Chamber
CN104950444A (zh) * 2014-03-28 2015-09-30 精工爱普生株式会社 电光装置
US20150277016A1 (en) * 2014-03-28 2015-10-01 Boe Technology Group Co., Ltd. Light Guide Plate, Backlight Module, and Method for Manufacturing Light Guide Plate
US9164223B2 (en) 2009-03-05 2015-10-20 Iti Scotland Limited Light guides
US20160377798A1 (en) * 2014-01-06 2016-12-29 Agira, Inc. Light guide apparatus and fabrication method thereof
US20170045665A1 (en) * 2015-08-14 2017-02-16 Radiant Opto-Electronics (Suzhou) Co. Ltd. Light guide film, backlight module and display device having the same
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CN102197261B (zh) 2015-11-25
JP2017033949A (ja) 2017-02-09
TW201027150A (en) 2010-07-16
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TWI507745B (zh) 2015-11-11
GB0819308D0 (en) 2008-11-26
WO2010046694A1 (en) 2010-04-29
GB2464916B (en) 2013-07-31
CN102197261A (zh) 2011-09-21
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US20150260898A1 (en) 2015-09-17
GB2464916A (en) 2010-05-05

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