WO2020050848A1 - Ensembles optiques pour dispositifs électroniques - Google Patents

Ensembles optiques pour dispositifs électroniques Download PDF

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Publication number
WO2020050848A1
WO2020050848A1 PCT/US2018/049840 US2018049840W WO2020050848A1 WO 2020050848 A1 WO2020050848 A1 WO 2020050848A1 US 2018049840 W US2018049840 W US 2018049840W WO 2020050848 A1 WO2020050848 A1 WO 2020050848A1
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WO
WIPO (PCT)
Prior art keywords
optical
nanospheres
adhesive layer
hollow
light
Prior art date
Application number
PCT/US2018/049840
Other languages
English (en)
Inventor
Kuan-Ting Wu
Chi-Hao Chang
Yung Yun Chen
Original Assignee
Hewlett-Packard Development Company, L.P.
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 Hewlett-Packard Development Company, L.P. filed Critical Hewlett-Packard Development Company, L.P.
Priority to PCT/US2018/049840 priority Critical patent/WO2020050848A1/fr
Publication of WO2020050848A1 publication Critical patent/WO2020050848A1/fr

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
    • G02B5/0236—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element
    • G02B5/0242—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element by means of dispersed particles
    • 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
    • G02F1/13338—Input devices, e.g. touch panels
    • 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
    • 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
    • G02F2202/00—Materials and properties
    • G02F2202/28—Adhesive materials or arrangements
    • 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
    • G02F2202/00—Materials and properties
    • G02F2202/36—Micro- or nanomaterials

Definitions

  • FIG. 1 is a schematic view of an optical assembly for an electronic device in accordance with examples of the present disclosure
  • FIG. 2 is a schematic view of a touchscreen optical assembly for an electronic device in accordance with examples of the present disclosure
  • FIG. 3 is a schematic view of an alternative optical assembly for an electronic device in accordance with examples of the present disclosure.
  • FIG. 4 is a flowchart depicting an example method of making an optical assembly in accordance with examples of the present disclosure.
  • the present disclosure relates to optical displays and methods of making optical displays, and in examples herein, can include an adhesive layer positioned between an optical light-emitter, e.g., electronic visual display, and an optical light-transmission component, e.g. a lens, an optically transparent cover, a touch sensor, etc.
  • an optical sparkle effect sometimes generated by coupling an optical light-emitter with an optical light-transmission component can be ameliorated
  • an optical assembly for an electronic device can include an optical light-emitter, an optical light-transmission component, and an adhesive layer between the optical light-emitter and the optical
  • the adhesive layer can include an optically clear adhesive and hollow optical nanospheres dispersed in the optically clear adhesive.
  • the hollow optical nanospheres can include an outer shell and a hollow inner portion.
  • the optical light-emitter can be an electronic visual display, such as a backlit display device.
  • the optical light-transmission component can include a touch sensor, a lens, or an optically transparent cover, for example.
  • the hollow optical nanospheres can be present in the adhesive layer in an amount from about 0.1 wt% to about 3 wt% based on a total weight of the adhesive layer.
  • the hollow optical nanospheres can include polyacrylic nanospheres, polycarbonate nanospheres, cyclic olefin copolymer nanospheres, or glass nanospheres, for example.
  • the hollow optical nanospheres can have a D50 particle size from about 100 nm to about 1.25 pm.
  • the optically clear adhesive can have a refractive index from about 1 .48 to about 1.7
  • the outer shell of the hollow optical nanospheres can have a refractive index from about 1.48 to about 1.7
  • the hollow inner portion can have a refractive index from about 0.48 to about 0.7 different than the refractive index of the optically clear adhesive, the outer shell, or both.
  • the optically clear adhesive can include polyacrylic, e.g., polymethyl methacrylate (PMMA); cyclic olefin copolymer;
  • a touchscreen optical assembly for an electronic device can include an electronic visual display, a touch sensor, and an adhesive layer between the electronic visual display and the touch sensor.
  • the adhesive layer can include an optically clear adhesive and hollow optical nanospheres dispersed in the optically clear adhesive.
  • the hollow optical nanospheres can include an outer shell and a hollow inner portion.
  • the hollow optical nanospheres can be present in the adhesive layer in an amount from about 0.1 wt% to about 3 wt% based on a total weight of the adhesive layer.
  • the optically clear adhesive can have a refractive index from about 1 .48 to about 1.7
  • the outer shell of the hollow optical nanospheres can have a refractive index from about 1.48 to about 1.7
  • the hollow inner portion can have a refractive index from about 0.48 to about 0.7 different than the refractive index of the optically clear adhesive, the outer shell, or both.
  • the touchscreen optical assembly can further include a lens and a second adhesive layer between the touch sensor and the lens on a touch sensor surface opposite the electronic visual display and adhesive layer.
  • a method of making an optical assembly of an electronic device can include admixing hollow optical nanospheres into an optically clear adhesive to form an adhesive layer composition.
  • the hollow optical nanospheres can include an outer shell and a hollow inner portion.
  • the method can also include adhering a light-emitting surface of an optical light-emitter to a surface of a light-transmission component to form an adhesive layer
  • the adhesive layer can have a thickness from about 10 pm to about 100 pm, and the hollow optical nanospheres can be present in the adhesive layer in an amount from about 0.1 wt% to about 3 wt% based on a total weight of the adhesive layer.
  • the optically clear adhesive can have a refractive index from about 1 .48 to about 1.7
  • the outer shell of the hollow optical nanospheres can have a refractive index from about 1.48 to about 1.7
  • the hollow inner portion can have a refractive index from about 0.48 to about 0.7 different than the refractive index of the optically clear adhesive, the outer shell, or both.
  • an optical assembly 100 for an electronic device 105 can include an optical light-emitter 1 10, an optical light-transmission component 130, and an adhesive layer 120 between a light-emitting surface 1 12 of the optical light-emitter and an inner surface 132 of the optical light-transmission component.
  • the adhesive layer directly adheres the optical light-emitter and the optical light-transmission component together, but in some examples, there may be intervening layers therebetween.
  • the adhesive layer can include an optically clear adhesive 122 and hollow optical nanospheres 124 dispersed in the optically clear adhesive.
  • the hollow optical nanospheres can include an outer shell 126 and a hollow inner portion 128.
  • scattered light is defined as light that is scattered to a greater degree than when introduced at the same intensity into the same optically clear adhesive without the presence of the hollow optical nanospheres.
  • the light can enter the optical-light-emitter to be viewed through a viewing surface 134, which may be the outermost surface of the optical assembly.
  • the viewing surface is an outermost surface of the optical light-transmission component, but if there are other layers or components applied to the optical light-transmission component, the viewing surface may be associated with a different layer or structure, e.g., a lens, touch screen, protective optically clear cover, etc., applied with other adhesive layers, for example.
  • a touchscreen optical assembly 200 for an electronic device 205 is shown, and can include an electronic visual display 210 as the optical light-emitter, a touch sensor 230 as the optical light-transmission component, and an adhesive layer 220 between the electronic visual display and the touch sensor.
  • the other details of this touchscreen optical assembly can be as described previously with respect to FIG. 1 and hereinafter.
  • an optical assembly 300 for an electronic device 305 is shown, and can include an optical light-emitter 310, an optical light-transmission component 330, and an adhesive layer 320 between the electronic visual display to the touch sensor, which in this instance is directly adhering the optical light-emitter and the optical light-transmission component together.
  • the other details of this optical assembly with respect to these three structures or layers can be the same as described in FIG.1 or FIG. 2, and hereinafter.
  • both the adhesive layer and the second adhesive layer can be as described herein having hollow optical nanospheres dispersed in an optically clear adhesive.
  • the nanospheres can be included to provide light scattering, and as light scattering with one adhesive layer may be sufficient to ameliorate optical sparkle that may be undesirable, one of the two adhesive layers may be formulated without the hollow optical nanospheres.
  • both adhesives may likewise be formulated as described herein to include both the hollow optical nanospheres and the optically clear adhesive.
  • the term“second” relative to a structure can be viewed as arbitrary, as either layer can be considered the adhesive layer or the second adhesive layer, depending on context.
  • the optical light-emitter may be the structure shown at 310 as previously described.
  • the adhesive layer may be adhesive layer 340 and the optical light-transmission component may be the structure shown at 350, as adhesive layer 340 is between the optical light emitter 310 and the (second) optical light-transmission component 350.
  • a viewing surface 334 is present on optical light-transmission component 350, described previously as the second optical light-transmission component.
  • the optical light-emitter 310 can be an electronic visual display
  • the optical light-transmission component 330 can be a touchscreen (including a touch sensor) that is touch-sensitive for user input
  • the second optical light-emitter 310 can be an electronic visual display
  • the optical light-transmission component 330 can be a touchscreen (including a touch sensor) that is touch-sensitive for user input
  • the second optical light-emitter 310 can be
  • the light-transmission component can be a lens or an optically transparent cover.
  • the adhesive layer 320 and/or the second adhesive layer 340 can include hollow optical nanospheres dispersed in an optically clear adhesive as described herein.
  • optical light-emitters shown and described herein can include electrically produced visual displays that emit light, including simple static light display boxes, but more typically, electronic visual displays which can present electronically transmitted images, text, video, etc.
  • electronic visual displays include light emitting components of desktop computer monitors, laptop monitors, tablet monitors, smartphone monitors, gaming system monitors, television monitors, digital signage monitors, etc.
  • Optical light-emitters can include complete display systems, or can include just the backlight associated with the display system.
  • optical light-emitters can include backlight architecture or completed assemblies of a liquid crystal display (LCD) emitter; a thin film transistor (TFT) LCD; an electroluminescent emitter, e.g., electro-luminescence (EL), light-emitting diode (LED), organic light-emitting diode (OLED), etc. ; a photoluminescent emitter, e.g., plasma display panel (PDP); or the like.
  • the light-emitter can be an LED or an OLED.
  • An LED structure may include an LED backlight, diffuser and/or light guides, polarizing films, liquid crystals, color filters, etc. These LED assemblies, which can be referred to collectively as an optical light emitter, e.g., LED backlight with intervening layers prior to positioning of the adhesive layer and optical light-transmission component.
  • An OLED structure may include, for example, a substrate, an anode layer or assembly of layers, a conductive layer (e.g., organic molecules or polymer), an emissive layer (e.g., organic molecules or polymer, and a cathode or assembly of cathodes.
  • the adhesives described herein can be used between the OLED assembly and the optical
  • light-transmission component(s) described herein that may be assembled with OLED optical light-emitter assembly.
  • the optical light-transmission component can be a structural layer that allows the transmission of light emitted from the optical light-emitter through the adhesive layer.
  • optical transmission components include output components, such as covers and/or lenses that may be optically clear, transparent, or translucent, etc.
  • an optically transparent cover such as glass, clear plastic film(s) or layer(s), or the like can be used as the optical light-transmission component.
  • a lens that provides some magnification or focusing can be used as the optical
  • optical light-transmission component can be optically clear or transparent, but can likewise have a tint or color added, in some instances. There can also be privacy films or other layers associated with the optical transmission component. In other examples, the optical light-transmission component can likewise include a contrast coating or other coating that may be used with electronic displays.
  • an input/output component such as a touchscreen including a touch sensor.
  • a touchscreen With a touchscreen, a user can view information emitted therebeneath from the optical light-emitter, making the touchscreen in this instance an output component. Additionally, however, a touchscreen can also be used to receive input or control to an electronic device, for example.
  • Touchscreen touch sensors come in a wide variety of types, some which work with user finger input, others are designed for input using a stylus, and some allow for both types of input, e.g., finger, stylus, or other device.
  • the optical light-transmission component is shown as a single layer, or as multiple single layers if more than one optical light-transmission component is present.
  • the various layers that may be present in various touchscreen technologies as it is understood that the component as a whole, as shown in the FIGS., is considered to be a touchscreen that may include multiple layers including a touch sensor.
  • Touchscreen technologies that can be used with the optical assemblies of the present disclosure include, without limitation, resistive touchscreens; surface acoustic wave (SAW) touchscreens; capacitive touchscreens, e.g., surface capacitance, projected capacitance, mutual capacitance, self-capacitance, stylus capacitance, etc.; infrared grid; infrared acrylic projection; optical imaging; dispersive signal technology; acoustic pulse recognition; or the like.
  • the touchscreen can be electrically coupled to an electronic device to provide touchscreen accuracy, learning, or logic; consider ergonomics; provide haptics such as vibratory feedback; receive security information such as fingerprint verification; etc.
  • the touchscreen can include a capacitive touch sensor.
  • a finger of a user which is conductive, can be used to create a coupled capacitor with electronics components beneath an outer display surface when a touchscreen display surface is contacted.
  • a capacitive touch screen can include an image processing controller that continuously images a touch profile of a user. The controller can thus pick up changes in the capacitive value between electronic nodes and drive lines to pinpoint the location or movement of a touch of a display surface. The coordinates detected can then be fed back to the operating system.
  • touchscreens with capacitive touch sensors are described above, it is noted that other touchscreen/touch sensor technologies can likewise be used as listed above.
  • the adhesive layer of the present disclosure can be formulated, in one example, to ameliorate an optical sparkle effect that can occur with many optically clear adhesives.
  • “Sparkle” is an optical phenomenon that occurs due to unwanted scattering that occurs with many different combinations of optical light-emitters and optical light-transmission components, and is often described as“visual noise” in the form of sparkle dots exhibiting varied intensities and colors, depending on the combination of optical elements. Intensity, color, and location of sparkle dots can change with the angle of observation of an optical assembly.
  • the adhesive layer(s) described herein can ameliorate some of this sparkle effect, which can be distracting to a user.
  • the adhesive layer for example, can include an optically clear adhesive and hollow optical nanospheres dispersed in the optically clear adhesive.
  • the adhesive layer can have a thickness from about 10 pm to about 100 pm, from about 15 pm to about 50 pm, or from about 20 pm to about 40 pm.
  • the hollow optical nanospheres can be present in the adhesive layer in an amount from about 0.1 wt% to about 3 wt% based on a total weight of the adhesive layer.
  • they can be present at from about 0.2 wt% to about 3 wt%, from about 0.3 wt% to about 3 wt%, from about 0.4 wt% to about 2.5 wt%, from about 0.5 wt% to about 2.5 wt%, from about 0.5 wt% to about 2 wt%, from about 0.75 wt% to about 2 wt%, from about 1 wt% to about 2.5 wt%, or from about 1 wt% to about 2 wt%.
  • the hollow optical nanospheres include an outer shell and an inner hollow portion.
  • the inner hollow portion can include air, which has a refractive index of about 1 at standard temperature and pressure (0 °C and 760 mmHg).
  • the outer shell can include a material that is considered to be an optical polymer or glass so that it is transparent or nearly transparent, at the same time having a refractive index that is different enough from the air that it can provide light scattering.
  • Example materials that can be used in this regard include, for example, polyacrylic, e.g., polymethyl methacrylate (PMMA);
  • hollow optical nanospheres such as other optical materials that have a refractive index different enough from air to provide light scattering sufficient to reduce the sparkle effect.
  • Table 1 below provides the refractive index of the some example materials that can be used as an outer shell of hollow optical nanospheres.
  • a range of refractive indices for the outer shell material can range from about 1 .48 to about 1.7, from about 1 .49 to about 1.66, from about 1.49 to about 1.62, or from about 1.5 to about 1.6.
  • Outer shell materials within this refractive index range can be considered optical materials, but are different enough from the air or other similar gases that may be present in the hollow optical nanospheres and the hollow inner portion.
  • the difference can be the difference between the refractive index of the outer shell and the refractive index of air, e.g., a difference from about 0.48 to about 0.7.
  • the particle size of the hollow optical nanospheres, as well as the size of the inner dimension of the outer shell (defining the hollow inner portion or air pocket) can be considered to promote light scattering. If the particle size is too small, or if the inner dimension of the hollow optical nanospheres is too small, then the hollow optical nanospheres may be optically less effective at scattering light. Good scattering can occur when the particle size is about half the wavelength of the light, which may be the visible light spectrum.
  • hollow optical nanospheres with a D50 particle size from about 100 nm to about 1.25 pm can be effective for scattering light.
  • Other particle size ranges can be from about 100 nm to about 1 pm, from about 150 nm to about 750 nm, from about 200 nm to about 700 nm, from about 250 nm to about 600 nm, from about 150 nm to about 500 nm, or from about 200 nm to about 500 nm.
  • visible light scattering is less effective, for example.
  • the inner size or dimension of the outer shell e.g., average inner diameter or average length across the air pocket, can be from about 60 nm to about 750 nm, from about 100 nm to about 500 nm, or from about 150 nm to about 300 nm.
  • “D50 particle size” is defined as the particle size at which about half of the particles are larger than the D50 particle size and about half of the other particles are smaller than the D50 particle size (this value can be based on weight).
  • particle size refers to the value of the diameter of spherical particles. If a particle is not uniformly spherical, an average diameter can be used. The same is true when determining the D50 value of the inner dimension of the outer shell of the hollow optical nanospheres.
  • this adhesive can likewise have a refractive index from about 1 .48 to about 1.7.
  • the optically clear adhesive can be present in the adhesive layer at from about 90 wt% to about 99.7 wt%, meaning that there may be other components present in the adhesive layer than the optically clear adhesive and the hollow optical nanospheres.
  • a surfactant can be added for wetting and dispersion of the hollow optical nanospheres in the optically clear adhesive. If added, the surfactant can include, for example, a polyethylene glycol ester, an anhydrosorbitol ester, a carboxylic amide, a polyoxyethylene fatty acid amide, the like, or a combination thereof.
  • the surfactant can be added at from about 0.05 wt% to about 5 wt%, from about 0.1 wt% to about 4 wt%, or from about 0.5 wt% to about 3 wt%, for example.
  • the optically clear adhesive can be present in the adhesive layer at from about 95 wt% to about 99.7 wt%, from about 97 wt% to about 99.7 wt%, from about 97 wt% to about 99 wt%, or from about 98 wt% to about 99.7 wt%, based on dry weight of the adhesive layer.
  • Non-limiting examples of optically clear adhesive materials include polyacrylic, e.g., polymethyl methacrylate (PMMA); cyclic olefin copolymer; polycarbonate; epoxies; or a combination thereof.
  • PMMA for example, can have a refractive index of about 1.49.
  • Cyclic olefin copolymer can have a refractive index of about 1.53 to about 1.54.
  • Polycarbonates can have a refractive index of about 1 .58 to about 1.6.
  • Some types of epoxies may have a refractive index from about 1.5 to about 1 .6.
  • FIGS. 1-3 show example electronic devices according to the present disclosure.
  • Electronic devices can include any of a number of components and features that can be electronically and optically associated with optical assemblies described above.
  • Example electronic devices that can utilize the optical assemblies of the present disclosure include desktop computer monitors, laptops, tablets, smartphones, gaming system monitors, television monitors, digital signage, and the like.
  • there are also utilitarian devices that provide functions that are independent of optical display but can include an optical display for user display or interface enhancement, e.g., touch screen interface for appliances, security systems, printers, cameras, keypads, musical instrument, automobiles, aircraft, watercraft, etc.
  • a method 400 of making an optical assembly of an electronic device can include admixing 410 hollow optical nanospheres into an optically clear adhesive to form an adhesive layer composition.
  • the hollow optical nanospheres can include an outer shell and a hollow inner portion.
  • the method can also include adhering 420 a light-emitting surface of an optical light-emitter to a surface of a light-transmission component to form an adhesive layer therebetween.
  • the adhesive layer can have a thickness from about 10 pm to about 100 pm, and the hollow optical nanospheres can be present in the adhesive layer in an amount from about 0.1 wt% to about 3 wt% based on a total weight of the adhesive layer.
  • the optically clear adhesive can have a refractive index from about 1.48 to about 1.7
  • the outer shell of the hollow optical nanospheres can have a refractive index from about 1.48 to about 1 .7
  • the hollow inner portion can have a refractive index from about 0.48 to about 0.7 different than the refractive index of the optically clear adhesive, the outer shell, or both.
  • a layer thickness from about 10 pm to about 100 pm should be interpreted to include the explicitly recited limits of 10 pm to 100 pm, and to include thicknesses such as about 10 pm and about 100 pm, as well as subranges such as about 20 pm to about 40 pm, about 50 pm to about 90 pm, about 10 pm to about 70 pm, etc.
  • An example touchscreen optical assembly for an electronic device such as that shown in FIG. 3 is prepared as follows:
  • An adhesive layer composition is prepared by thoroughly admixing 98.5 wt% of polymethyl methacrylate (PMMA) optically clear adhesive (refractive index about 1 .49) with 0.3 wt% glass nanospheres (refractive index about 1 .65) in the form of hollow optical nanospheres having a D50 particle size of about 250 nm and an inner dimension (air pocket diameter) of about 90 nm.
  • PMMA polymethyl methacrylate
  • glass nanospheres reffractive index about 1 .65
  • the admixture also includes 1.2 wt% surfactant. If more glass nanospheres are included, e.g., 1 wt%, then less surfactant may be used, less optically clear adhesive used, and/or both.
  • the admixture is blended using a mechanical mixer for 30 minutes at 30 °C until homogenous.
  • a first portion of the adhesive layer composition is applied to an optical light-emitter, namely a TFT LCD display, at a thickness of about 30 pm to form an adhesive layer that is optically clear.
  • An optical light-transmission component namely a touchscreen
  • a capacitive touch sensor that allows for light output and user input, e.g., finger, is applied to the adhesive layer applied in 2) above.
  • a second portion of the adhesive layer composition is applied to the touchscreen surface at a thickness of about 30 pm to form a second adhesive layer.
  • a second optical light-transmission component namely a protective optically clear cover, is then applied to the second adhesive layer.

Abstract

La présente invention concerne un ensemble optique pour un dispositif électronique. L'ensemble optique peut comprendre un émetteur de lumière optique, un composant de transmission de lumière optique, et une couche adhésive entre l'émetteur de lumière optique et le composant de transmission de lumière optique. La couche adhésive peut comprendre un adhésif optiquement transparent et des nanosphères optiques creuses dispersées dans l'adhésif optiquement transparent. Les nanosphères optiques creuses peuvent comprendre une enveloppe externe et une partie interne creuse.
PCT/US2018/049840 2018-09-07 2018-09-07 Ensembles optiques pour dispositifs électroniques WO2020050848A1 (fr)

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JP2010044269A (ja) * 2008-08-14 2010-02-25 Toppan Printing Co Ltd 光拡散板、光学シート、バックライトユニット及びディスプレイ装置
WO2014038160A1 (fr) * 2012-09-04 2014-03-13 Sony Corporation Dispositif d'affichage et appareil électronique
KR20150057474A (ko) * 2013-11-19 2015-05-28 동우 화인켐 주식회사 방현 코팅용 조성물 및 이를 이용한 방현 필름
WO2017078448A1 (fr) * 2015-11-06 2017-05-11 주식회사 모다이노칩 Dispositif électronique comportant un capteur de pression

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