WO2018057380A1 - Plaques de guidage de lumière à éclairage périphérique et dispositifs comprenant celles-ci - Google Patents

Plaques de guidage de lumière à éclairage périphérique et dispositifs comprenant celles-ci Download PDF

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Publication number
WO2018057380A1
WO2018057380A1 PCT/US2017/051478 US2017051478W WO2018057380A1 WO 2018057380 A1 WO2018057380 A1 WO 2018057380A1 US 2017051478 W US2017051478 W US 2017051478W WO 2018057380 A1 WO2018057380 A1 WO 2018057380A1
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WO
WIPO (PCT)
Prior art keywords
light
light guide
major surface
guide plate
diffusive
Prior art date
Application number
PCT/US2017/051478
Other languages
English (en)
Inventor
Shenping Li
Steven S Rosenblum
James Andrew West
Original Assignee
Corning Incorporated
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 Corning Incorporated filed Critical Corning Incorporated
Priority to JP2019515404A priority Critical patent/JP2019530162A/ja
Priority to KR1020197011456A priority patent/KR20190053251A/ko
Priority to CN201780058027.8A priority patent/CN109716019A/zh
Publication of WO2018057380A1 publication Critical patent/WO2018057380A1/fr

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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
    • G02B6/0033—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
    • 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
    • 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
    • G02F1/1336—Illuminating devices
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
    • 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
    • G02B6/002—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 by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces
    • 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
    • G02B6/0051—Diffusing sheet or layer

Definitions

  • the disclosure relates generally to edge-lit light guide plates and display or lighting devices comprising such light guide plates, and more particularly to glass light guide plates comprising an optical bonding layer, a diffusive light reflecting layer, and an optional light absorbing region.
  • LCDs Liquid crystal displays
  • LCDs are commonly used in various electronics, such as cell phones, laptops, electronic tablets, televisions, and computer monitors.
  • LCDs can be limited as compared to other display devices in terms of brightness, contrast ratio, efficiency, and viewing angle.
  • contrast ratio e.g., color gamut
  • brightness e.g., brightness
  • device size e.g., thickness
  • LCDs can comprise a backlight unit (BLU) for producing light that can then be converted, filtered, and/or polarized to produce the desired image.
  • BLU backlight unit
  • BLUs may be edge-lit, e.g. , comprising a light source coupled to an edge of a light guide plate (LGP), or back-lit, e.g., comprising a two-dimensional array of light sources disposed behind the LCD panel.
  • Edge-lit BLUs may have the advantage of reduced display thickness as compared to back-lit BLUs.
  • the light source(s) may be positioned at a distance from the LGP, thus making the overall display thickness greater than that of an edge-lit BLU.
  • Current consumer demands for electronic devices include thinner displays and/or narrower bezels around the display region.
  • LGPs As LGPs become increasingly thinner to accommodate such displays, they may have reduced rigidity, making it difficult to produce LGPs that are both sufficiently large and thin to meet consumer requirements. This is particularly the case for plastic LGPs, which have lower mechanical strength and/or stiffness as compared to their glass counterparts.
  • the rigidity of the LGP may be improved by laminating a rear reflector to a major surface of the LGP.
  • LGP- reflector laminate assemblies may also present some drawbacks in the case of edge-lit LGPs, such as the generation of a bright band near the edge of the LGP to which the light source is coupled. A potential solution to the bright band
  • the phenomenon can include, for instance, increasing the gap between the LGP and the light source.
  • increasing the gap between the light source and LGP can increase the size of the display bezel and/or reduce optical coupling efficiency.
  • Chamfering the light-incident edge of the LGP may also reduce the bright band effect, but the additional step of chamfering the LGP may increase the manufacturing and/or integration costs of the overall assembly, and the chamfer length may also necessitate a thicker bezel.
  • LGP assemblies having reduced thickness and/or improved rigidity while also avoiding or reducing the bright band effect. It would also be advantageous to provide edge-lit BLUs capable of producing a uniform distribution of light in terms of color and/or brightness across the viewing surface.
  • the disclosure relates, in various embodiments, to light guide assemblies comprising a light guide plate having a light emitting major surface, an opposing major surface, and at least one light incident edge, and a diffusive light reflecting layer bonded to at least a portion of the opposing major surface of the light guide plate by an optical bonding layer, the optical bonding layer having a refractive index lower than a refractive index of the light guide plate.
  • light guide assemblies comprising a light guide plate having a light emitting major surface, an opposing major surface, and at least one light incident edge, a light reflecting layer bonded to at least a portion of the opposing major surface of the light guide plate by an optical bonding layer; and a light absorbing region proximate the at least one light incident edge of the light guide plate.
  • Display, lighting, and electronic devices comprising such light guides are also disclosed herein.
  • the diffusive light reflecting layer may be bonded to substantially all of the opposing major surface of the LGP. In other embodiments, the diffusive light reflecting layer may be bonded to a portion of the opposing major surface proximate the at least one light incident edge of the LGP, and a second light reflecting layer, which can be specular or diffusive, may be bonded to the remainder of the opposing major surface.
  • a diffusive light reflecting band may have a width ranging from about 2 mm to about 15 mm.
  • the diffusive light reflecting layer may have at least one of a 3-dB scattering angle greater than or equal to about 80 degrees or a Sigma scattering parameter of greater than or equal to about 1 .
  • the diffusive light reflecting layer can have a reflectivity of at least about 90% at visible wavelengths.
  • the light absorbing region may comprise a light absorbing layer bonded to at least one of the light emitting major surface or opposing major surface of the light guide plate.
  • the light reflecting layer may be bonded to a first region of the opposing major surface of the light guide plate and the light absorbing layer is bonded to at least one of (i) a second region of the opposing major surface of the light guide plate proximate the at least one light incident edge or (ii) a third region of the light emitting major surface of the light guide plate proximate the at least one light incident edge.
  • the light absorbing region may, for example, have a width ranging from about 2 mm to about 15 mm and/or an absorbance of at least about 80% at visible wavelengths.
  • the at least one light incident edge of the light guide plate may comprise at least one chamfer.
  • the refractive index of the optical bonding layer may, for example, be at least about 7% less than the refractive index of the light guide plate.
  • the optical bonding layer may have an optical transmission of at least about 30% at visible wavelengths over a length of about 500 mm or greater.
  • FIGS. 1A-B illustrate exemplary light guide assemblies according to various embodiments of the disclosure
  • FIGS. 2A-B illustrate exemplary light guide assemblies according to additional embodiments of the disclosure
  • FIGS. 3A-B illustrate exemplary light guide assemblies according to further embodiments of the disclosure
  • FIG. 4A-B are graphical depictions of light distribution across LGPs laminated with specular and diffusive reflectors, respectively;
  • FIG. 5 is a graphical depiction of brightness as function of distance from the light-incident edge for LGPs laminated with specular and diffusive reflectors;
  • FIGS. 6A-B are graphical depictions of brightness difference between two positions (10 mm and 500 mm away from the light incident edge) as a function of distance between the light source and LGP for LGPs laminated with specular and diffusive reflectors, respectively;
  • FIGS. 7A-B are graphical depictions of brightness difference between two positions (10 mm and 500 mm away from the light incident edge) as a function of distance between the light source and LGP for chamfered LGPs laminated with specular and diffusive reflectors, respectively;
  • FIG. 8 is a graphical depiction of coupling efficiency as a function of distance between the light source and LGP for LGPs having varying chamfer heights;
  • FIG. 9 is a graphical depiction of scattered power as a function of polar angle for diffusive reflectors with varying Sigma scattering parameters
  • FIG. 10 is a graphical depiction of brightness difference between two positions (10 mm and 500 mm away from the light incident edge) as a function of distance between the light source and LGP for LGPs laminated to reflectors having varying Sigma scattering parameters;
  • FIG. 11 is a graphical depiction of brightness difference between two positions (10 mm and 500 mm away from the light incident edge) as a function of diffusive band width for LGPs laminated with a specular reflector and a diffusive reflector band;
  • FIG. 12A-B are graphical depictions of brightness difference between two positions (10 mm and 500 mm away from the light incident edge) as a function of absorbing band width for LGPs laminated with a specular reflector;
  • FIGS. 12C is a graphical depiction of brightness difference between two positions (10 mm and 500 mm away from the light incident edge) as a function of absorbing band width for LGPs laminated with a diffusive reflector.
  • light guide assemblies comprising a light guide plate including a light emitting major surface, an opposing major surface, and a at least one light incident edge, and a diffusive light reflecting layer bonded to the opposing major surface of the light guide plate by an optical bonding layer, the optical bonding layer having a refractive index lower than a refractive index of the light guide plate.
  • light guide assemblies comprising a light guide plate having a light emitting major surface, an opposing major surface, and at least one light incident edge, a light reflecting layer bonded to the opposing major surface of the light guide plate by an optical bonding layer; and a light absorbing region proximate the at least one light incident edge of the light guide plate.
  • Devices comprising such light guides are also disclosed herein, such as display, lighting, and electronic devices, e.g., televisions, computers, phones, tablets, and other display panels, luminaires, solid-state lighting, billboards, and other architectural elements, to name a few.
  • display e.g., televisions, computers, phones, tablets, and other display panels, luminaires, solid-state lighting, billboards, and other architectural elements, to name a few.
  • FIGS. 1 -3 illustrate exemplary embodiments of light guide assemblies.
  • the following general description is intended to provide an overview of the claimed devices, and various aspects will be more specifically discussed throughout the disclosure with reference to the non-limiting depicted embodiments, these embodiments being interchangeable with one another within the context of the disclosure.
  • FIGS. 1A-B illustrate various exemplary embodiments of light guide assemblies 100, 100' comprising a light guide plate (LGP) 110 or a chamfered LGP 110', respectively.
  • the LGP 110, 110' may comprise a light emitting major surface 115 and an opposing major surface 120.
  • the LGP 110, 110' may further comprise at least one light incident edge 125, to which a light source 105 may be optically coupled, in some embodiments.
  • the light source 105 can have a height h that may vary depending, e.g., upon the thickness of the LGP 110, 110'. Although only one light incident edge 125 is illustrated in FIGS.
  • the LGP may comprise more than one light incident edge, such as two, three, four, or more light incident edges.
  • at least one light source may be coupled to each edge of the LGP to form a light incident perimeter around the LGP.
  • the light incident edge(s) 125 may comprise chamfered surface(s) 145, which may have a height H and which may form an angle ⁇ with the major surface(s) of the chamfered LGP 110'.
  • the light guide assembly 100, 100' may further comprise a diffusive light reflecting layer 130, bonded to the major surface 120 by an optical bonding layer 135.
  • the term "optically coupled” is intended to denote that a light source is positioned at an edge of the LGP so as to introduce light into the LGP.
  • a light source may be optically coupled to the LGP even though it is not in physical contact with the LGP, e.g., the two components may be separated by a gap G as illustrated in FIGS. 1 -3, although a gap may also not be present in some embodiments.
  • Additional light sources may be optically coupled to other edge surfaces of the LGP, such as adjacent or opposing edge surfaces.
  • the diffusive light reflecting layer 130 may cover all or substantially all of major surface 120.
  • diffusive light reflecting layer 130 may cover only a portion of major surface 120.
  • a light reflecting layer 140 which may be specular or diffusive, without limitation, may cover a first region of major surface 120 and diffusive light reflecting layer 130 may cover a region proximate or adjacent to the light incident edge 125, e.g., forming a diffusive light reflecting band.
  • a diffusive light reflecting band may have a width W D extending from the light incident edge toward an opposing edge to a predetermined position along the LGP. While FIGS.
  • the diffusive light reflecting band may be positioned proximate any edge optically coupled to a light source.
  • the LGP may comprise two or more light incident edges and a diffusive light reflective band may be positioned proximate each of the light incident edges.
  • the light guide assembly 100, 100' can comprise a light absorbing region, such as a light absorbing layer 150, which may be positioned proximate or adjacent to light incident edge 125 e.g., forming a light absorbing band.
  • a light absorbing band may have a width W A extending from the light incident edge toward an opposing edge to a
  • the absorbing layer 150 may be bonded to major surface 120 (as illustrated), to light emitting surface 115 (not illustrated), or both (not illustrated). While FIGS. 3A-B depict the light absorbing region as a separate layer, it is also possible for the LGP to be treated to create an integral light absorbing region, as discussed in more detail below. Further, while FIGS. 3A-B depict only one light source 105 optically coupled to one edge of the LGP, it is to be understood that multiple light sources can be coupled to one edge, or to more than one edge of the LGP. In such instances, the light absorbing band may be positioned proximate any edge optically coupled to a light source. For example, the LGP may comprise two or more light incident edges and a diffusive light reflective band may be positioned proximate each of the light incident edges.
  • the LGP 110, 110' can comprise any material known in the art for use in display devices.
  • the LGP may comprise a plastic such as polymethyl methacrylate (PMMA) or a glass, such as aluminosilicate, alkali- aluminosilicate, borosilicate, alkali-borosilicate, aluminoborosilicate, alkali- aluminoborosilicate, soda lime, or other suitable glasses.
  • PMMA polymethyl methacrylate
  • a glass such as aluminosilicate, alkali- aluminosilicate, borosilicate, alkali-borosilicate, aluminoborosilicate, alkali- aluminoborosilicate, soda lime, or other suitable glasses.
  • suitable glasses suitable for use as a LGP include, for instance, EAGLE XG ® , LotusTM, Willow ® , IrisTM, and Gorilla ® glasses from Corning
  • Some non-limiting glass compositions can include between about 50 mol % to about 90 mol% Si0 2 , between 0 mol% to about 20 mol% Al 2 0 3 , between
  • R is any one or more of Li, Na, K, Rb, Cs and x is 2, or Zn, Mg, Ca, Sr or Ba and x is 1.
  • the glass comprises less than about 1 ppm each of Co, Ni, and Cr.
  • the concentration of Fe is less than about 50 ppm, less than about 20 ppm, or less than about 10 ppm.
  • the glass comprises between about 60 mol % to about 80 mol% Si0 2 , between about 0.1 mol% to about 15 mol% Al 2 0 3 , 0 mol% to about 12 mol% B 2 0 3 , and about 0.1 mol% to about 15 mol% R 2 0 and about 0.1 mol% to about 15 mol% RO, wherein R is any one or more of Li, Na, K, Rb, Cs and x is 2, or Zn, Mg, Ca, Sr or Ba and x is 1 .
  • the glass composition can comprise between about 65.79 mol % to about 78.17 mol% Si0 2 , between about 2.94 mol% to about 12.12 mol% Al 2 0 3 , between about 0 mol% to about 1 1.16 mol% B 2 0 3 , between about 0 mol% to about 2.06 mol% Li 2 0, between about 3.52 mol% to about 13.25 mol% Na 2 0, between about 0 mol% to about 4.83 mol% K 2 0, between about 0 mol% to about 3.01 mol% ZnO, between about 0 mol% to about 8.72 mol% MgO, between about 0 mol% to about 4.24 mol% CaO, between about 0 mol% to about 6.17 mol% SrO, between about 0 mol% to about 4.3 mol% BaO, and between about 0.07 mol% to about 0.1 1 mol% Sn0 2 .
  • the glass composition can comprise an R x O/AI 2 0 3 ratio between 0.95 and 3.23, wherein R is any one or more of Li, Na, K, Rb, Cs and x is 2.
  • the glass composition may comprise an R x O/AI 2 0 3 ratio between 1.18 and 5.68, wherein R is any one or more of Li, Na, K, Rb, Cs and x is 2, or Zn, Mg, Ca, Sr or Ba and x is 1.
  • the glass composition can comprise R x O, Al 2 0 3 , and MgO in amounts (expressed in mol%) such that R x O - Al 2 0 3 - MgO is between -4.25 and 4.0, wherein R is any one or more of Li, Na, K, Rb, Cs and x is 2.
  • the glass composition may comprise between about 66 mol % to about 78 mol% Si0 2 , between about 4 mol% to about 1 1 mol% Al 2 0 3 , between about 4 mol% to about 1 1 mol% B 2 0 3 , between about 0 mol% to about 2 mol% Li 2 0, between about 4 mol% to about 12 mol% Na 2 0, between about 0 mol% to about 2 mol% K 2 0, between about 0 mol% to about 2 mol% ZnO, between about 0 mol% to about 5 mol% MgO, between about 0 mol% to about 2 mol% CaO, between about 0 mol% to about 5 mol% SrO, between about 0 mol% to about 2 mol% BaO, and between about 0 mol% to about 2 mol% Sn0 2 .
  • the glass composition can comprise between about 72 mol % to about 80 mol% Si0 2 , between about 3 mol% to about 7 mol% Al 2 0 3 , between about 0 mol% to about 2 mol% B 2 0 3 , between about 0 mol% to about 2 mol% Li 2 0, between about 6 mol% to about 15 mol% Na 2 0, between about 0 mol% to about 2 mol% K 2 0, between about 0 mol% to about 2 mol% ZnO, between about 2 mol% to about 10 mol% MgO, between about 0 mol% to about 2 mol% CaO, between about 0 mol% to about 2 mol% SrO, between about 0 mol% to about 2 mol% BaO, and between about 0 mol% to about 2 mol% Sn0 2 .
  • the glass composition can comprise between about 60 mol % to about 80 mol% Si0 2 , between about 0 mol% to about 15 mol% Al 2 0 3 , between about 0 mol% to about 15 mol% B 2 0 3 , and about 2 mol% to about 50 mol% R x O, wherein R is any one or more of Li, Na, K, Rb, Cs and x is 2, or Zn, Mg, Ca, Sr or Ba and x is 1 , and wherein Fe + 30Cr + 35Ni ⁇ about 60 ppm.
  • the LGP 110, 110' can comprise a color shift Ay less than 0.030, such as ranging from about 0.005 to about 0.03 (e.g. , about 0.005, 0.006, 0.007, 0.008, 0.009, 0.010, 0.01 1 , 0.012, 0.013, 0.014, 0.015, 0.020, 0.025, or 0.030).
  • the LGP can comprise a color shift less than 0.015, such as less than 0.008.
  • the LGP can have a light attenuation (e.g., due to absorption and/or scattering losses) of less than about 4 dB/m, such as less than about 3 dB/m, less than about 2 dB/m, less than about 1 dB/m, less than about 0.5 dB/m, less than about 0.2 dB/m, or even less, e.g., ranging from about 0.2 dB/m to about 4 dB/m, for wavelengths ranging from about 420-750 nm.
  • a refractive index of the LGP may, in various embodiments, range from about 1 .3 to about 1 .8, such as from about 1 .35 to about 1 .7, from about
  • the LGP 110, 110' may, in some embodiments, be chemically strengthened, e.g., by ion exchange.
  • ions within a glass sheet at or near the surface of the glass sheet may be exchanged for larger metal ions, for example, from a salt bath.
  • the incorporation of the larger ions into the glass can strengthen the sheet by creating a compressive stress in a near surface region thereof.
  • a corresponding tensile stress can be induced within a central region of the glass sheet to balance the compressive stress.
  • Ion exchange may be carried out, for example, by immersing the glass in a molten salt bath for a predetermined period of time.
  • exemplary salt baths include, but are not limited to, KN0 3 , LiN0 3 , NaN0 3 , RbN0 3 , and combinations thereof.
  • the temperature of the molten salt bath and treatment time period can vary depending on the desired depth and magnitude of the compressive stress layer. It is within the ability of one skilled in the art to determine the time and temperature according to the desired application.
  • the temperature of the molten salt bath may range from about 400°C to about 800°C, such as from about 400°C to about 500°C, and the predetermined time period may range from about 4 to about 24 hours, such as from about 4 hours to about 10 hours, although other temperature and time combinations are envisioned.
  • the glass can be submerged in a KN0 3 bath, for example, at about 450°C for about 6 hours to obtain a K-enriched layer which imparts a surface compressive stress.
  • the LGP 110, 110' may have a thickness of less than or equal to about 3 mm, for example, ranging from about 0.1 mm to about
  • a length of the LGP 110, 110' may also vary depending on the application, e.g., as appropriate for small handheld devices or large displays such as billboards. For instance, a length of the LGP may as small as 1 mm, or may be as great as 10 m, or even greater. In some embodiments, the LGP length may range from about 10 mm to about 1 m, such as from about 50 mm to about 500 mm, from about 100 mm to about 400 mm, or from about 200 mm to about 300 mm, including all ranges and subranges therebetween.
  • the LGP 110, 110' can have any desired size and/or shape as appropriate to produce a desired light distribution.
  • the major surfaces 115, 120 may, in certain embodiments, be planar or substantially planar and/or may be parallel or substantially parallel.
  • the LGP 110, 110' may comprise four edges or may comprise more than four edges, e.g. a multi-sided polygon. In other words,
  • the LGP 110, 110' may comprise less than four edges, e.g., a triangle.
  • the LGP may comprise a rectangular, square, or rhomboid sheet having four edges, although other shapes and
  • the chamfer dimensions may be chosen as appropriate to achieve the desired coupling efficiency, display configuration, and/or light distribution.
  • the chamfer height H may range from about 0.01 mm to about 1 mm, such as from about 0.05 mm to about 0.9 mm, from about 0.1 mm to about 0.8 mm, from about 0.2 mm to about 0.7 mm, from about 0.3 mm to about 0.6 mm, or from about 0.4 mm to about 0.5 mm, including all ranges and subranges therebetween.
  • the chamfer angle ⁇ may similarly vary depending on the LGP configuration, for example, from about 5° to about 60°, from about 8° to about 50°, from about 10° to about 45°, from about 15° to about 40°, from about 20° to about 30°, including all ranges and subranges therebetween.
  • the LGP and/or optical bonding layer may, in certain embodiments, be transparent or substantially transparent.
  • transparent is intended to denote that the LGP and/or optical bonding layer, at a thickness of 1 mm, has an optical transmission of greater than about 80% in the visible region of the spectrum ( ⁇ 420-750nm).
  • an exemplary transparent material may have greater than about 85% transmittance in the visible light range, such as greater than about 90%, greater than about 95%, or greater than about 99% transmittance, including all ranges and subranges therebetween.
  • an exemplary transparent material may have an optical transmittance of greater than about 30% in the visible wavelength range over a length of about 500 mm or greater, such as an optical transmittance greater than about 50%, greater than about 60%, or greater than about 70%, including all ranges and subranges therebetween.
  • an exemplary transparent material can comprise less than about 1 ppm each of Co, Ni, and Cr. In some embodiments, the concentration of Fe is less than about 50 ppm, less than about 20 ppm, or less than about 10 ppm. In other embodiments, Fe + 30Cr + 35Ni ⁇ about 60 ppm, Fe + 30Cr + 35Ni ⁇ about 40 ppm, Fe + 30Cr + 35Ni ⁇ about 20 ppm, or Fe + 30Cr + 35Ni ⁇ about 10 ppm. According to additional embodiments, an exemplary transparent material can comprise a color shift Ay ⁇ 0.015 or, in some embodiments, a color shift Ay ⁇ 0.008.
  • Color shift may be characterized by measuring variation in the x and y chromaticity coordinates along the length L using the CIE 1931 standard for color measurements.
  • Exemplary LGPs or optical bonding layers may have Ay ⁇ 0.01 , Ay ⁇ 0.005, Ay ⁇ 0.003, or Ay ⁇ 0.001 .
  • the light emitting surface 115 and/or the opposing major surface 120 of the LGP 110, 110' may be patterned with a plurality of light extraction features.
  • the term "patterned" is intended to denote that the plurality of light extraction features is present on or in the surface(s) of the LGP in any given pattern or design, which may, for example, be random or arranged, repetitive or non-repetitive, uniform or non-uniform.
  • the light extraction features may be located within the matrix of the LGP adjacent the surface, e.g., below the surface.
  • the light extraction features may be distributed across the surface, e.g. as textural features making up a roughened or raised surface, or may be distributed within and throughout the substrate or portions thereof, e.g., as laser-induced features.
  • the light extraction features optionally present on the surface(s) of the LGP may comprise light scattering sites.
  • the light extraction features optionally present on the surface(s) of the LGP may comprise refractive structures that break the total internal reflection condition of the LGP.
  • Non-limiting examples of the shapes of these refractive features may include hemispherical, toroidal, or ellipsoidal shapes.
  • the extraction features may be patterned in a suitable density so as to produce substantially uniform light output intensity across the light emitting surface of the LGP.
  • a density of the light extraction features proximate the light source may be lower than a density of the light extraction features at a point further removed from the light source, or vice versa, such as a gradient from one end of the LGP to another, as appropriate to create the desired light output distribution across the LGP.
  • Suitable methods for creating such light extraction features can include printing, such as inkjet printing, screen printing, microprinting, and the like, texturing, mechanical roughening, etching, injection molding, coating, laser damaging, or any combination thereof.
  • Non-limiting examples of such methods include, for instance, acid etching a surface, coating a surface with Ti0 2 , and laser damaging the substrate by focusing a laser on a surface or within the LGP matrix.
  • Light extraction features may also be produced using any of the methods disclosed in co-pending and co-owned International Patent Application Nos.
  • the optical bonding layer 135 can comprise any material known in the art suitable for laminating the reflector and the glass or plastic LGP.
  • the optical bonding layer may comprise at least one material chosen from epoxies, photopolymers, urethanes, silicones, cyanoacrylates, polyester resin based materials, and like materials.
  • Exemplary thicknesses of the optical bonding layer may range, e.g., from about 10 ⁇ to about 500 ⁇ , such as from about 20 ⁇ to about 400 ⁇ , from about 30 ⁇ to about 300 ⁇ , from about 40 ⁇ to about 200 ⁇ , or from about 50 ⁇ to about 100 ⁇ , including all ranges and subranges therebetween.
  • the optical bonding layer 135 may have a refractive index ( ⁇ 0 ⁇ ) that is at least 7% less than the refractive index of the LGP (n L cp)-
  • n 0 _3 ⁇ 4 may be at least 10% less than n L cp, such as at least 13% or at least 15% less than n L cp, including all ranges and subranges therebetween.
  • an optical bonding layer may have a refractive index less of than about 1 .6, such as ranging from about 1 .55 to about 1 .45, or even lower.
  • the refractive index of the optical bonding layer may be less than 1 .7, such as ranging from about 1 .3 to about 1 .65, from about 1 .35 to about 1 .6, from about 1 .4 to about 1 .55, or from about 1 .45 to about 1 .5, including all ranges and subranges therebetween.
  • the optical bonding layer may be transparent at visible wavelengths.
  • the optical bonding layer may have an optical transmittance of greater than about 30% in the visible wavelength range over a length, e.g., transmission distance, greater than or equal to 500 mm, such as greater than about 50%, greater than about 60%, or greater than about 70%, including all ranges and subranges therebetween.
  • the light guide assembly 100, 100' can include at least one light reflecting layer, such as diffusive light reflecting layer 130 and/or light reflecting layer 140.
  • Reflecting layer 140 may be a specular reflector or a diffusive reflector.
  • the diffusive light reflecting layer 130 can include materials chosen from polytetrafluoroethylene (PTFE) optical diffusing films, diffusive polystyrene films, diffusive acrylic polymer films, and white paper layers, to name a few.
  • the light reflecting layer 140 may include, for example, materials such as organic or inorganic multi-layer optical films, metal foils, and like materials.
  • the diffusive light reflecting layer 130 and/or light reflecting layer 140 may have a reflectance greater than or equal to about 90% at visible wavelengths, such as greater than or equal to about 92%, 95%, 96%, 97%, 98%, 99%, or 100%, including all ranges and subranges therebetween, e.g., ranging from 90% to 100% reflectance.
  • a diffusive reflector such as light reflecting layer 130 may have, or may be treated to provide, a roughened surface.
  • the diffusive light reflecting layer 130 may be a Lambertian reflector.
  • the diffusive light reflective layer 130 may be characterized by a 3-dB scattering angle greater than or equal to about 80 degrees, such as greater than or equal to 85 degrees, 90 degrees, 95 degrees, 100 degrees, 105 degrees, 1 10 degrees, 1 15 degrees, 120 degrees, or any range or subrange therebetween, e.g., ranging from about 80 degrees to about 120 degrees.
  • the diffusive light reflecting layer 130 may also be characterized by a Gaussian scattering function, with a Sigma scattering parameter greater than or equal to about 1 , such as ranging from about 2 to about 5, or from about 3 to about 4, including all ranges and subranges therebetween. [0057] As illustrated in FIGS. 1A-B, the diffusive light reflecting layer 130 may cover all or substantially all of major surface 120. Alternatively, as illustrated in FIGS. 2A-B, light reflecting layer 140 (e.g., specular or diffusive) may cover a first region of the major surface 120 and diffusive light reflecting layer 130 may cover a second region proximate the light incident edge 125.
  • specular or diffusive may cover a first region of the major surface 120 and diffusive light reflecting layer 130 may cover a second region proximate the light incident edge 125.
  • the diffusive light reflecting layer 130 may extend from the light incident edge toward an opposing edge for a predetermined distance, e.g. , to form a diffusive band having a width W D .
  • a diffusive band having a width W D ranging from about 2 mm to about 15 mm, such as from about 3 mm to about 12 mm, from about 4 mm to about 10 mm, from about 5 mm to about 8 mm, or from about 6 mm to about 7 mm, including all ranges and subranges therebetween.
  • the diffusive light reflecting layer 130 if present in the form of a band proximate the light incident edge 125, may have any shape appropriate for providing the desired light distribution including, but not limited to, rectangular, square, and any other regular or irregular shapes, without limitation, such as shapes having curvilinear edges.
  • the light guide assemblies 100, 100' may also comprise a light absorbing region proximate the light incident edge 125.
  • a light absorbing region may be present as a light absorbing layer 150, which may be present on the light emitting major surface 115 (not illustrated) or the opposing major surface 120 (as depicted).
  • Suitable materials for such a light absorbing layer 150 may include, but are not limited to, carbon, carbon nanotubes, carbon black, carbon black filled polymers (e.g., acrylates, polypropylenes, epoxies, etc.), black pigments, and combinations thereof.
  • the LGP 110, 110' may be treated to create an integral light absorbing region, e.g., by exposing a portion of the LGP to short-wavelength UV light having a wavelength in the range of about 193 nm to about 250 nm.
  • the LGP may be exposed to the selected wavelength for a time period sufficient to induce formation of color centers on or near the surface(s) of the LGP.
  • the LGP and light source can then be positioned relative to each other such that the treated light absorbing regions are proximate the light source.
  • Reflecting layer 140 may be a specular reflector or a diffusive reflector.
  • the absorbing region e.g., light absorbing layer 150 and/or integral absorbing region, may have an absorbance greater than or equal to about 80% at visible wavelengths, such as greater than or equal to about 85%, 90%, 95%, 99%, or 100%, including all ranges and subranges therebetween, e.g. , ranging from 80% to 100% absorbance.
  • the light absorbing region may extend from the light incident edge toward an opposing edge for a predetermined distance, e.g., to form an absorbing band having a width W A .
  • Such a band may, in certain embodiments, having a width W A ranging from about 2 mm to about 15 mm, such as from about 3 mm to about 12 mm, from about 4 mm to about 10 mm, from about 5 mm to about 8 mm, or from about 6 mm to about 7 mm, including all ranges and subranges therebetween.
  • the light absorbing region may have any shape appropriate for providing the desired light distribution including, but not limited to, rectangular, square, and any other regular or irregular shapes, without limitation, such as shapes having curvilinear edges.
  • the LGPs disclosed herein may be used in various display devices including, but not limited to LCDs. Exemplary devices comprising such LGPs include televisions, computers, phones, tablets, and other display panels. According to various embodiments of the disclosure, display devices can comprise at least one of the disclosed LGPs 110, 110' coupled to at least one light source 105, which may emit blue, UV, or near-UV light (e.g., approximately 100-500 nm). In some embodiments, the light source 105 may be a Lambertian light source, such as a light emitting diode (LED).
  • LED light emitting diode
  • the height h of the light source 105 may vary as desired, for instance, depending on the thickness of the LGP. According to non-limiting embodiments, the light source may have a height less than 5 mm, such as ranging from about 0.5 mm to about 5 mm, from about 1 mm to about 4 mm, or from about 2 mm to about 3 mm, including all ranges and subranges therebetween. In certain embodiments, the light source 105 may be positioned relative to the LGP 110, 110' such that a gap G exists between the two components.
  • the distance of such a gap may range, for example, from about 0.01 mm to about 1 mm such as from about 0.05 mm to about 0.9 mm, from about 0.1 mm to about 0.8 mm, from about 0.2 mm to about 0.7 mm, from about 0.3 mm to about 0.6 mm, or from about 0.4 mm to about 0.5 mm, including all ranges in between.
  • the optical components of an exemplary LCD may further comprise a reflector, a diffuser, one or more prism films, one or more linear or reflecting polarizers, a thin film transistor (TFT) array, a liquid crystal layer, and one or more color filters, to name a few components.
  • the LGPs disclosed herein may also be used in various illuminating devices, such as luminaires or solid state lighting devices, as well as architectural elements such as billboards.
  • the terms “the,” “a,” or “an,” mean “at least one,” and should not be limited to “only one” unless explicitly indicated to the contrary.
  • reference to “a light source” includes examples having two or more such light sources unless the context clearly indicates otherwise.
  • a “plurality” or an “array” is intended to denote “more than one.”
  • a “plurality of light extraction features” “or an array of light extraction features” includes two or more such features, such as three or more such features, and so on.
  • Ranges can be expressed herein as from “about” one particular value, and/or to "about” another particular value and/or “between” values. When such a range is expressed, examples include from the one particular value and/or to the other particular value. Similarly, when values are expressed as approximations, by use of the antecedent "about,” it will be understood that the particular value forms another aspect. It will be further understood that the endpoints of each of the ranges are significant both in relation to the other endpoint, and independently of the other endpoint.
  • substantially is intended to note that a described feature is equal or approximately equal to a value or description.
  • a “substantially planar” surface is intended to denote a surface that is planar or approximately planar.
  • substantially similar is intended to denote that two values are equal or approximately equal. In some embodiments, “substantially similar” may denote values within about 10% of each other, such as within about 5% of each other, or within about 2% of each other.
  • Example 1 Diffusive Light Reflecting Layer
  • FIG. 4B similarly depicts the light distribution along a LGP without a chamfer laminated to a diffusive rear reflector with otherwise identical parameters. A bright band can be seen in FIG.
  • FIG. 4A near the light incident edge (bottom edge) for the LGP laminated to a specular reflector.
  • FIG. 4B shows that the bright band at the bottom edge has been eliminated for the LGP laminated to a diffusive reflector.
  • FIGS. 4A-B can also be seen in FIG. 5, which graphically plots brightness as a function of distance from the light incident edge of the LGP for the specular reflector (A) and the diffusive reflector (B). It can be further appreciated from the plot in FIG. 5 that the LGP laminated to the specular reflector produced a bright band (increased brightness in the region near the LED as compared to the rest of the LGP) that extends approximately 100 mm from the light incident edge of the LGP.
  • G 0 when the gap between the LED and LGP was eliminated.
  • the light output from the LGP becomes more uniform, e.g., the bright band effect is reduced or eliminated.
  • the brightness difference decreases as the gap between the LED and LGP increases.
  • the brightness difference for the chamfered LGPs decreases slightly faster with the gap increase as compared to the LGPs without chamfer (FIGS. 6A- B).
  • increasing the gap between the light source and LED may necessitate a wider bezel to mask the display components from user view.
  • FIG. 9 demonstrates scattered power for a diffusive reflector with different Sigma scattering parameters using the Gaussian function to characterize the scattering performance of the reflector.
  • a Sigma parameter of 0 represents the angular distribution of specular reflection
  • a Sigma parameter of 5 represents near-Lambertian angular distribution.
  • the brightness difference decreases from 28% to 6.4% when the Sigma parameter of the reflector increases from 0 (specular) to 1 , and further decreases to less than 5% when the Sigma parameter increases to 2 and higher (approaching Lambertian).
  • FIG. 11 plots the brightness difference between two positions along the LGP (10 mm and 500 mm from the light incident edge) as a function of diffusive reflector band width for LGPs without chamfer laminated to a specular reflector with or without a diffusive reflector band proximate the light incident edge.
  • the brightness difference decreases as the width of the diffusive reflector band increases.
  • FIG. 12A plots the brightness difference between two positions along the LGP (10 mm and 500 mm from the light incident edge) as a function of light absorbing band width for LGPs without chamfer laminated to a specular reflector with or without a light absorbing band applied to the LGP proximate the light incident edge.
  • the brightness difference decreases as the width of the light absorbing band increases.
  • absorbance 50% (X)
  • a 95% (Y)
  • Z 100% (Z)
  • FIG. 12C plots the brightness difference between two positions along the LGP (10 mm and 500 mm from the light incident edge) as a function of light absorbing band width for LGPs without chamfer laminated to a diffusive reflector.
  • the brightness difference decreases as the width of the absorbing band increases.
  • FIG. 12A regular reflector
  • the difference is less pronounced because the brightness uniformity is already improved by the diffusive reflector.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Planar Illumination Modules (AREA)
  • Liquid Crystal (AREA)

Abstract

La présente invention concerne des ensembles de guidage de lumière (100) comprenant une plaque de guidage de lumière (110) et au moins l'une parmi une région d'absorption de lumière à proximité d'un bord d'incidence de lumière de la plaque de guidage de lumière ou d'une couche de réflexion de lumière diffusive (130) fixée à au moins une partie d'une surface principale (120) de la plaque de guidage de lumière par une couche de liaison optique (135). L'invention concerne en outre des dispositifs d'affichage et d'éclairage comprenant de telles plaques de guidage de lumière.
PCT/US2017/051478 2016-09-21 2017-09-14 Plaques de guidage de lumière à éclairage périphérique et dispositifs comprenant celles-ci WO2018057380A1 (fr)

Priority Applications (3)

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JP2019515404A JP2019530162A (ja) 2016-09-21 2017-09-14 エッジライト式導光板、および、それを備えた装置
KR1020197011456A KR20190053251A (ko) 2016-09-21 2017-09-14 엣지 조사 도광판들 및 이를 포함하는 장치들
CN201780058027.8A CN109716019A (zh) 2016-09-21 2017-09-14 边缘发光导光板和包含其的装置

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US62/397,441 2016-09-21

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WO2021162924A1 (fr) * 2020-02-11 2021-08-19 Corning Incorporated Dispositif d'éclairage d'étagère
US11657670B2 (en) 2021-03-16 2023-05-23 Aristocrat Technologies, Inc. Segmented display assembly for gaming device
EP4193919A1 (fr) * 2021-12-10 2023-06-14 Uniwersytet w Bialymstoku Écran illuminé par les bords et à motifs pour l'examen des potentiels visuels évoqués avec une imagerie par résonance magnétique simultanée
WO2023215140A1 (fr) * 2022-05-06 2023-11-09 Corning Incorporated Dispositif d'affichage comprenant une unité de rétroéclairage avec plaque de diffuseur chanfreinée

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CN112015007A (zh) * 2020-09-15 2020-12-01 武汉华星光电技术有限公司 背光模组以及显示装置

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WO2021162924A1 (fr) * 2020-02-11 2021-08-19 Corning Incorporated Dispositif d'éclairage d'étagère
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WO2023215140A1 (fr) * 2022-05-06 2023-11-09 Corning Incorporated Dispositif d'affichage comprenant une unité de rétroéclairage avec plaque de diffuseur chanfreinée

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CN109716019A (zh) 2019-05-03

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