[go: up one dir, main page]

WO2020262426A1 - Élément optique, réseau de microlentilles et système d'affichage utilisant un réseau de microlentilles - Google Patents

Élément optique, réseau de microlentilles et système d'affichage utilisant un réseau de microlentilles Download PDF

Info

Publication number
WO2020262426A1
WO2020262426A1 PCT/JP2020/024716 JP2020024716W WO2020262426A1 WO 2020262426 A1 WO2020262426 A1 WO 2020262426A1 JP 2020024716 W JP2020024716 W JP 2020024716W WO 2020262426 A1 WO2020262426 A1 WO 2020262426A1
Authority
WO
WIPO (PCT)
Prior art keywords
main surface
electrode
electrode layer
opening
polymer 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.)
Ceased
Application number
PCT/JP2020/024716
Other languages
English (en)
Japanese (ja)
Inventor
山田　泰美
利博 平井
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.)
Shinshu University NUC
Nitto Denko Corp
Original Assignee
Shinshu University NUC
Nitto Denko Corp
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
Priority claimed from JP2020107457A external-priority patent/JP2021009364A/ja
Application filed by Shinshu University NUC, Nitto Denko Corp filed Critical Shinshu University NUC
Publication of WO2020262426A1 publication Critical patent/WO2020262426A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

Classifications

    • 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 
    • G02F1/19—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 variable-reflection or variable-refraction elements not provided for in groups G02F1/015 - G02F1/169

Definitions

  • the present invention relates to an optical element, a microlens array, and a display system using a microlens array.
  • a focus adjustment mechanism for example, see Patent Document 1
  • a lens drive mechanism for example, see Patent Document 2
  • FIG. 1 a focus adjustment mechanism
  • FIG. 1 a lens drive mechanism
  • FIG. 1 a focus adjustment mechanism
  • FIG. 1 a lens drive mechanism
  • FIG. 1 a focus adjustment mechanism
  • FIG. 1 a lens drive mechanism
  • FIG. 1 a focus adjustment mechanism
  • FIG. 1 a lens drive mechanism
  • a lens drive mechanism for example, see Patent Document 2
  • the polymer material is used for the lens holder that holds the lens, and the position of the lens is moved along the optical axis by utilizing the expansion and contraction of the polymer material due to the application of voltage.
  • the configuration that moves the lens along the optical axis changes the position of a single lens by expanding and contracting the polymer material placed on the lens holder.
  • the holder is first deformed, and the lens position is changed by the deformation of the holder, so that it is difficult to sufficiently improve the responsiveness and accuracy of the lens drive.
  • the configuration in which the distribution of the amount of electrolytic strain is provided in the in-plane direction of the organic material layer is such that a minute amount of materials having different characteristics is applied to a desired position by inkjet or microcontact printing, so that the lens manufacturing process is required. It's complicated and time consuming.
  • an object of the present invention is to provide an optical element capable of adjusting optical characteristics with a simple configuration and an applied technique thereof.
  • an optical element having a first electrode layer, a second electrode layer, and a polymer material layer arranged between the first electrode layer and the second electrode layer.
  • the first electrode layer has an opening, and the polymer material layer on the surface of the first electrode layer is deformed under voltage application, and the opening of the first electrode layer on the first main surface.
  • the ratio of the opening area on the second main surface on the opposite side to the area is 0.7 or more.
  • FIG. 1 is a basic configuration diagram of the optical element 10 of the embodiment.
  • the optical element 10 has a three-layer laminated structure in which a polymer material layer 11 is sandwiched between a pair of electrodes 12 and electrodes 13. As shown in FIGS. 1B and 1C, the optical element 10 is placed on the first main surface 131 of at least one electrode (for example, the electrode 13) in a state where a voltage is applied between the electrodes. It has a light scatterer 15. The light scattering body 15 is formed based on the voltage responsiveness of the polymer material layer 11.
  • the polymer material layer 11 is formed of a gel-like polymer material (hereinafter, appropriately referred to as "polymer gel").
  • the light scatterer 15 projects to the first main surface 131 of the electrode 13 by utilizing the expansion and contraction or deformation of the polymer gel due to the application of a voltage.
  • the first main surface 131 also referred to as "zero surface" of the electrode 13.
  • the electrode 13 It is assumed that it "protrudes" from the first main surface 131 of the above. Even with such a shape, the light scattering body 15 has a light scattering effect. As will be described later, the shape and height of the light scattering body 15 projecting from the first main surface 131 of the electrode 13 changes due to the deformation of the polymer gel that expands and contracts depending on the applied voltage. The height and / or shape of the light scatterer 15 also differs depending on the cross-sectional shape of the opening 14 of the electrode 13.
  • the electrode 13 has an opening 14 having a predetermined shape.
  • the ratio of the diameter ⁇ 2 or the opening area of the opening 14 on the first main surface 131 of the electrode 13 to the diameter ⁇ 2 or the opening area of the opening 14 on the second main surface 132 opposite to the first main surface 131. Is set in a predetermined range so that the light scatterer 15 is projected onto the first main surface 131 under voltage application.
  • a smaller shape than the diameter phi 2 or opening area of the opening 14 in the second major surface 132 As will be described later, the present invention is not limited to this example.
  • the opening area is preferably 1 mm 2, especially from but not limited to 10 [mu] m 2, preferably further is 100 ⁇ m 2 ⁇ 100,000 ⁇ m 2.
  • the thickness of the electrode 13 is preferably 100 ⁇ m or less, more preferably 40 ⁇ m or less.
  • Which of the electrode 12 and the electrode 13 is used as the anode can be set according to the direction in which the shape of the polymer material layer 11 is changed.
  • the electrode 12 is a cathode and the electrode 13 is an anode.
  • FIG. 1B when a voltage is applied between the electrodes 12 and 13, electrons are injected from the electrode 12 which is a cathode into the polymer material layer 11 which is a polymer gel and become negatively charged.
  • the polymer gel that generated a negative charge in the molecule is attracted to the inner wall 141 of the opening 14 of the electrode 13 that is the anode.
  • the polymer material layer 11 first rises along the inner wall 141, and the central portion of the opening 14 rises accordingly.
  • the opening 14 has a shape that becomes narrower as it approaches the surface of the electrode 13 (hereinafter referred to as "zero surface”). Since the polymer material layer 11 is an elastic body or a viscoelastic body, it is compressed inside the opening 14 as it rises inside the opening 14. The compressed polymer material layer 11 is pushed up from the opening 14 and protrudes from the zero surface of the electrode 13.
  • the shape of the light scattering body 15 having a recessed central portion can be changed to a shape having a more protruding central portion only by controlling the applied voltage.
  • the polymer gel used for the polymer material layer 11 is polyvinyl chloride (PVC: polyvinyl chloride), polymethyl methacrylate (PMMA), polyurethane (PU), polystyrene (PSt), polyvinyl acetate (PVAc), polyvinyl alcohol (polyvinyl alcohol).
  • PVC polyvinyl chloride
  • PMMA polymethyl methacrylate
  • PU polyurethane
  • PSt polystyrene
  • PVAc polyvinyl acetate
  • polyvinyl alcohol polyvinyl alcohol
  • PVA polycarbonate
  • PET polyethylene terephthalate
  • PAN polyacrylonitrile
  • silicone rubber silicone rubber
  • PVC polyvinyl urethane
  • a suitable plasticizer may be added to the PVC, or the PVC may be dissolved in a solvent.
  • DBA dibutyl adipate
  • DEA diethyl adipate
  • DOA dioctyl adipate
  • DES diethyl sebacate
  • phthalate Dioctyl
  • DOP dioctyl phthalate
  • DEP diethyl phthalate
  • TBAC tributyl acetyl citrate
  • TBAC tributyl acetyl citrate
  • the mixing ratio of the plasticizer is 50 wt% or more, preferably 75 wt% or more. If the mixing ratio is less than 50 wt%, it becomes difficult to deform the polymer material layer 11 even when a voltage is applied. When the mixing ratio is 50 wt% or more and less than 75 wt%, the polymer material layer 11 can be deformed by applying a voltage, but a high voltage must be applied, which induces dielectric breakdown of the polymer material layer 11. It is expected to do. By setting the mixing ratio to 75 wt% or more, the strength polymer material layer 11 can be deformed at an appropriate voltage strength that does not cause dielectric breakdown of the polymer material layer 11.
  • the transmittance of the polymer gel for light having a wavelength ⁇ of 550 nm is 90% to 92%.
  • the refractive index of the polymer gel also changes depending on the addition rate of the plasticizer (for example, DBA).
  • the refractive index of the polymer gel used in the embodiment is 1.44 to 1.49 with respect to light having a wavelength of 589 nm.
  • the higher the addition rate of DBA the lower the refractive index.
  • the light scatterer 15 formed of this polymer gel has sufficient transmittance for green (G) light rays.
  • the light transmittance and the refractive index of a normal white glass substrate (BK7) are 90% and 1.52, and the polymer gel of the embodiment is a highly transparent material with little reflection.
  • the deformation of a polymer gel is mainly based on the mechanical properties such as elasticity or viscoelasticity of the gel and the electrostrictive properties such as dielectric constant. If the composition and thickness of the polymer material layer 11 in the film thickness direction and in the layer plane are uniform, a light scatterer 15 having substantially the same height and shape can be obtained by applying a voltage of the same intensity.
  • the thickness of the polymer material layer 11 is reduced by the volume of the polymer gel protruding from the opening 14. Therefore, the thickness of the polymer material layer 11 is reduced, and the position of the electrode 13 in contact with the polymer material layer 11 is also lowered.
  • the deformation of the polymer material layer 11 is reversible, and the initial state of FIG. 1 (A) can be restored by stopping the application of the voltage. Further, as will be described later, the height of the central portion of the light scattering body 15 can be adjusted according to the intensity of the applied voltage.
  • the shape of the opening 14 can be determined according to the purpose such as a circle, an ellipse, a polygon, etc., but in any case, the second main surface with respect to the opening area (or diameter) in the first main surface 131.
  • the ratio of the opening area (or diameter) at 132 is designed to be within a predetermined range.
  • the electrode 12 and the electrode 13 may be made of a conductive material, and are not particularly limited. When at least one of the electrode 12 and the electrode 13 is formed of metal, platinum, gold, silver, nickel, chromium, copper, titanium, tantalum, indium, palladium, lithium, niobium, alloys thereof and the like can be used. At least one of the electrode 12 and the electrode 13 may be formed of a transparent oxide semiconductor material such as ITO (Indium Tin Oxide), or a conductive polymer, conductive carbon, or the like may be used.
  • ITO Indium Tin Oxide
  • the opening 14 can be formed in the electrode 13 by, for example, a wet etching method or an electroforming method.
  • FIG. 12 shows a method of manufacturing the electrode 13A by wet etching. As shown in FIG. 12A, a resist mask 42 is formed on one side of a conductive plate (copper foil, gold leaf, aluminum foil, etc.) 43 having a predetermined thickness. The resist mask 42 has a predetermined opening pattern 44.
  • the conductive plate 43 By immersing the conductive plate 43 covered with the resist mask in, for example, an acidic solution capable of etching a metal, the conductive plate 43 is eroded from the resist forming surface as shown in FIGS. 12B to 12C. A pit 45 is formed, and an opening 14 penetrating the conductive plate 43 is formed. Finally, by removing the resist mask 42, an electrode 13A having an opening 14 having a desired shape as shown in (D) can be obtained. In this example, the diameter ⁇ 1 of the opening 14 on the first main surface 131 is larger than the diameter ⁇ 2 of the opening 14 on the second main surface 132. By controlling the etching time with respect to the thickness of the conductive plate 43, the opening diameter ⁇ 2 on the surface (second main surface) opposite to the surface on which the resist mask 42 is formed (first main surface 131) can be adjusted. can do.
  • FIG. 13 shows a method of manufacturing the electrode 13B by the electroforming method.
  • a photoresist 51 is applied onto a glass substrate 61 to a thickness of 30 ⁇ m, and then UV light is irradiated through a photomask 62 having a circular aperture pattern.
  • the unexposed portion is removed with a developing solution to form an array of cylinders 52 having a predetermined shape.
  • a positive resist may be used. Since the intensity of UV light is relatively high at the central portion in the irradiation surface, it is possible to form a tapered cylinder 52 as shown in (B) by controlling the irradiation time. It is also possible to form a straight cylinder by controlling the exposure conditions.
  • the wavelength ⁇ of the UV light is appropriately selected in the range of 100 nm to 400 nm depending on the resist material used.
  • a photoresist cylinder 52 having a predetermined shape and arrangement is obtained on the glass substrate 61.
  • a metal film 54 is formed between the cylinders 52 by a plating method.
  • the metal film 54 may be made of any material as long as it is a good conductor capable of forming plating, such as nickel (Ni), copper (Cu), gold (Au), and chromium (Cr).
  • the photoresist cylinder 52 and the glass substrate 61 are removed.
  • the photoresist and the glass substrate 61 can be removed by an ashing treatment using plasma, a wet treatment using a stripping solution, heating, or the like.
  • the electrode 13B having the openings 14 formed in a predetermined shape and arrangement is obtained.
  • the diameter ⁇ 1 of the opening 14 on the first main surface 131 is smaller than the diameter ⁇ 2 on the second main surface 132.
  • the exposure conditions of the photoresist 51 as described above, it is also possible to form a straight hole having an inner wall substantially perpendicular to the surface of the electrode 13A.
  • the diameter ⁇ 1 on the first main surface 131 side is small, but depending on the application of the light scatterer 15, a straight hole A mold opening may be required.
  • FIG. 14 is an optical microscope image of the electrode 13 formed by the electroforming method. An opening 14 having a desired diameter ⁇ is formed.
  • a solution of PVC formed to a predetermined size and added with a plasticizer is applied on the electrode 12 by a casting method or the like, and the polymer material layer 11 is formed.
  • An electrode 13 having an opening 14 is arranged on the polymer material layer 11.
  • any of the electrode 13A in FIG. 12, the electrode 13B in FIG. 13, and an electrode having a straight hole may be used depending on the application.
  • a predetermined voltage is applied between the electrodes 12 and 13 to form a light scattering body 15 on the surface of the electrodes 13.
  • the thickness of the polymer material layer 11 includes the shape (including the planar shape and the cross-sectional shape) and size of the opening 14 formed in the electrode 13, the height of the light scattering body 15 to be formed, the thickness of the electrodes 12 and 13, and the like. It is determined as appropriate according to the above. As an example, the thickness of the polymer material layer 11 is 1 mm or less, preferably 0.1 mm to 0.5 mm. When the thickness of the polymer material layer 11 is 0.1 mm or less, there are disadvantages such as non-uniform thickness and dielectric breakdown depending on the composition, but a microlens having a large number of fine lenses. From the viewpoint of producing an array sheet, the thickness of the polymer material layer 11 may be 0.1 mm or less.
  • FIG. 2 is a diagram showing the voltage dependence of the cross-sectional shape of the light scattering body 15 of the optical element 10.
  • the polymer gel protrudes from an opening having an inclined inner wall 141.
  • the applied voltage is increased to V1, V2, and V3, the protruding displacement from the zero plane increases as shown by the upward arrow.
  • the cross-sectional profile of the light scatterer changes.
  • the protruding displacement of the light scattering body 15 becomes higher as the entire aperture range.
  • the protruding displacement of the light scattering body 15 and its shape can be changed by controlling the intensity of the applied voltage.
  • FIG. 3 shows an example of the opening shape of the electrode of the embodiment.
  • the diameter phi 1 or the opening area of the first major surface 131 of the opening of the electrode 13 than the diameter phi 2 or the opening area of the second major surface 132, slightly larger.
  • the polymer material layer 11 can be displaced by applying a voltage to form a light scattering body 15 on the first main surface 131.
  • FIG. 3 (C) the difference in diameter or area of the opening between the first main surface 131 and the second main surface 132 is wider than that in FIG. 3 (B).
  • the protruding displacement of the light scattering body 15 with respect to the first main surface 131 is higher than that of the case of FIG. 3 (B).
  • the opening area of the electrode 13 on the first main surface 131 is made relatively smaller than the opening area on the second main surface 132, so that the opening area reaches the central portion of the opening. It is considered that the inflow pressure of the polymer gel is increased and the uplift in the central part of the opening is promoted.
  • FIG. 4 measures the protruding displacement of the light scattering body 15 when the ratio (S2 / S1) of the opening area S2 on the second main surface 132 to the opening area S1 on the first main surface 131 is changed.
  • It is a schematic diagram of a model. (In the figure, "protruding side (out side)” and the title) the first major surface 131 of the opening area S1 in fixed to 10 4 [mu] m 2, in the second major surface 132 (FIG, "Gel-side (in The opening area S2 in the side) and the notation ”) is changed in the range of 0.25 ⁇ 10 4 to 3.6 ⁇ 10 4 ⁇ m 2 .
  • the thickness of the electrode 13 is 30 ⁇ m, and the applied voltage is 600 V.
  • a PVC gel having a plasticizer DBA content of 83% is used as the polymer material layer 11.
  • the thickness of the PVC gel is 300 ⁇ m.
  • the ratio is 1.
  • Sratio > 1.
  • Sratio ⁇ 1.
  • the protruding displacement of the light scattering body 15 is the height h from the zero plane (first main plane 131) at the center of the aperture.
  • FIG. 5 shows the measurement results.
  • the horizontal axis is the ratio of the opening area on the second main surface 132 to the opening area on the first main surface 131, and the vertical axis is the height h ( ⁇ m) of the center of the light scattering body 15.
  • the protruding displacement of the polymer gel increases.
  • the ratio Sratio of the opening area is 2.56 or more
  • the effect of increasing the protruding displacement is large. This is because (i) the volume of the polymer gel that can flow into the hole increases as the hole volume increases, (ii) the inflow pressure of the polymer gel into the center of the hole increases, and (iii) the polymer gel is opened. It is considered that the pressure to push up to the upper end of the is increased.
  • the ratio Sratio of the opening area is 1, the light scattering body 15 protrudes from the first main surface 131 including the central region.
  • the S ratio is smaller than 1, the protruding displacement of the polymer gel decreases, but when the S ratio is 0.7 or more, the polymer gel protrudes to the first main surface 131 at least a part of the opening region.
  • the ratio Sratio of the opening area is smaller than 0.7, it becomes difficult to project the polymer gel from the first main surface 131.
  • the light scatterer is formed on the first main surface 131. 15 can be formed.
  • FIGS. 6A to 6C are diagrams showing changes in the protruding displacement of the polymer gel due to an increase in voltage.
  • the ratio Sratio that is, S2 / S1
  • the S ratio is 0.64.
  • the opening area S1 on the first main surface 131 is larger than the opening area S2 on the second main surface 132.
  • the ratio is 0.81.
  • the opening area S1 on the first main surface 131 is slightly larger than the opening area S2 on the second main surface 132.
  • the height of the light scattering body 15 can be changed while maintaining the concave shape in the aperture. Further, regardless of the magnitude of the applied voltage, at least a part of the light scattering body projects to the first main surface 131.
  • the ratio Sratio is 3.61.
  • the opening area S1 on the first main surface 131 is smaller than the opening area S2 on the second main surface 132.
  • the height of the light scatterer 15 changes more significantly than in FIG. 6B.
  • FIG. 7 shows the change in the protrusion displacement of the polymer gel due to the change in the ratio Sratio of the opening area with the applied voltage kept constant (for example, 600 V).
  • the height of the light scatterer 15 can be designed by changing at least one of the applied voltage and the aperture area ratio.
  • FIG. 8 shows the configuration of the optical element 10A as a modification of the optical element 10.
  • the electrode 13C in which the insulator 16 is coated with the conductive film 17 is used as the anode instead of the electrode 13 of the conductive film shown in FIG.
  • an inorganic insulator such as silicon dioxide or aluminum oxide or an insulating resin can be used.
  • the conductive film 17 is a thin film such as platinum, gold, silver, nickel, chromium, copper, titanium, tantalum, indium, palladium, lithium, niobium, alloys thereof, a conductive polymer, a conductive carbon, and a thin film of an oxide semiconductor. Etc. are formed. Both the insulator 16 and the conductive film 17 may be formed of a transparent material.
  • the electrode 13C has an opening 14 as in FIG.
  • the opening 14 is designed so that the ratio representing the ratio (S2 / S1) of the area of the opening 14 on the second main surface 132 to the area of the opening 14 on the first main surface 131 is within a predetermined range. ing.
  • the light scattering body 15 is formed in a reversible deformation process depending on the presence or absence of voltage application, as described in FIG. As described above, the light scatterer 15 is formed by being extruded from the opening 14 by utilizing the elasticity and voltage response characteristics of the polymer material layer 11, and has at least one of the ratio Sratio of the opening area and the applied voltage intensity. The protruding displacement of the gel can be changed by changing it.
  • the configuration of FIG. 8 has an advantage that a transparent optical element can be manufactured by using a transparent insulator and a transparent conductive film. Further, the use of a metal material can be reduced to reduce the mass of the entire optical element 10A.
  • the configuration of FIG. 1 and the configuration of FIG. 8 can be extended to a configuration having light scattering bodies 15 on both sides of the optical element.
  • an electrode 12 which is a cathode is used as a common electrode, and a polymer material layer 11 is arranged on both sides of the electrode 12 and sandwiched between electrodes 13 of two anodes. 15 can be generated.
  • a double-sided lens unit can be formed by using the electrode 12 in the middle as a transparent electrode.
  • the opening area ratio Sratio (S2 / S1) of the openings 14 formed in the two anodes do not necessarily have to be the same.
  • Each of the two anodes can be designed independently, depending on the height of the target of the light scatterer 15 projecting onto the surface of the anode.
  • FIG. 9 is a schematic view showing a microlens array 100 as an application example of the optical element 10 of FIG.
  • the microlens array 100 has an array of a plurality of light scatterers 15 on the first main surface 131 of the electrode 13.
  • the polymer material layer 11 is a polymer gel using PVC, PMMA, PU, PST, PVAc, PVA, PC, PET, PAN, SR, etc., as described with reference to FIG.
  • Plasticizers such as DBA, DEA, DES, DOP, DEP, DOA, and TBAC may be added to the polymer gel.
  • the mixing ratio of the plasticizer is 50 wt% or more, more preferably 75 wt% or more.
  • the electrodes 12 and 13 are made of an appropriate conductive material.
  • the electrode 12 is a cathode layer
  • the electrode 13 is an anode layer
  • the arrangement of the light scatterers 15 is formed on the first main surface 131 of the anode.
  • the thickness of the polymer material layer 11 is 300 ⁇ m
  • the diameter of the light scattering body 15 is 100 ⁇ m
  • the pitch between the centers is 150 ⁇ m.
  • the microlens array 100 is formed by utilizing the micron-order aperture formed in the film-shaped electrode 13 and the elasticity or viscoelasticity of the polymer gel, and has substantially the same height as the first main surface 131 of the electrode 13. , Light scatterers 15 having the same shape are arranged.
  • the protruding displacement of the central portion of the light scattering body 15 can be changed by changing at least one of the aperture area ratio of the aperture formed in the electrode 13 and the intensity of the voltage applied between the electrode 12 and the electrode 13. ..
  • the opening area ratio Sratio of the openings formed in the electrode 13 does not have to be the same as long as Sratio ⁇ 0.7 is satisfied, and the opening area ratio may be graded in a predetermined direction of the arrangement. For example, a gradient may be provided so that the protrusion displacement increases from the center of the array toward the outer circumference.
  • FIG. 10 is a schematic view of a display system 150 using the microlens array 100 of FIG.
  • the microlens array 100 can be applied to the projection optical system of the display system 150 in which the display panel, screen, poster, signboard, sign, etc. are used as the display medium 120.
  • an array of a plurality of light scattering bodies 15 is formed on the first main surface 131 of the electrode 13. Since the protruding displacement of the polymer gel changes according to the voltage strength, the position of the focal plane FP connecting the image 130 can be controlled.
  • FIG. 11 is a schematic view of the lighting system 250 using the microlens array 100 of the embodiment.
  • the lighting system 250 includes a light source 220 such as an LED lamp and a microlens array 100 arranged on the light emitting side of the light source 230.
  • the light distribution angle can be made variable by controlling the applied voltage to change the protruding displacement of the light scattering body 15 formed on the microlens array 100.
  • By controlling the spread of light in the lighting system 250 for example, it is possible to switch between diffuse type lighting and condensing type lighting.
  • the microlens array 100 is formed as thin as 1 mm or less and both the anode and the cathode can be made transparent, it can be applied to an ultra-thin camera, a head-mounted display (HMD), a microlens array (MLA) sheet, and the like. In addition, it can be applied to the medical field such as an endoscope system.
  • the optical element 10 having a single light scatterer 15 can also be applied to a light diffusion sheet, a lens sheet, and the like in the fields of medicine and image formation.
  • a predetermined amount of ionic liquid may be added to the polymeric material layer 11.
  • the driving voltage of the optical element 10 or the microlens array 100 can be reduced, and the deformation efficiency of the polymer material can be increased.
  • 1-ethyl- 3-Methylimidazolium disianamide
  • TBP-BF 4 tetrafluoroborate
  • the arrangement of the light scattering bodies 15 is not limited to the lattice-like arrangement, and may be an alternating arrangement including a honeycomb structure.
  • the shape of the opening 14 of the electrode 13 may be hexagonal and finely arranged.
  • the inclination of the inner wall 141 of the opening 14 formed in the electrode 13 does not necessarily have to be linear.
  • the inner wall 141 may be curved in a concave shape.
  • the volume inside the opening 14 can be increased to promote the protrusion of the polymer gel to the first main surface 131 of the electrode 13.
  • the microlens array 100 can also be expanded to have a light scatterer 15 on both sides.
  • An electrode 12 as a cathode is used as a common electrode, polymer material layers 11 are arranged on both sides of the electrode 13, and sandwiched between two electrodes 13 serving as positive anodes.
  • the openings formed in at least one electrode 13 are formed so that the ratio of the opening area on the second main surface on the polymer material layer 11 side to the opening area on the first main surface is within a predetermined range. ..
  • the opening area ratio different between the electrode 13 arranged on one side of the common electrode and the electrode 13 arranged on the other side, the amount of change due to the protrusion displacement of the gel and the voltage adjustment changes.
  • the characteristics of the light scattering body 15 can be changed, and various designs become possible.
  • the optical element and the microlens array of the embodiment can form a light scattering body having a variable height without using a complicated mechanism.

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mechanical Light Control Or Optical Switches (AREA)

Abstract

La présente invention concerne un élément optique dont la caractéristique optique peut être réglée par une configuration simple et son procédé de production. Ledit élément optique comprend une première couche d'électrode, une seconde couche d'électrode et une couche de matériau polymère disposée entre la première couche d'électrode et la seconde couche d'électrode, la première couche d'électrode ayant une ouverture, la couche de matériau polymère à la surface de la première couche d'électrode devenant déformée sous l'application d'une tension et le rapport de la zone de l'ouverture dans une seconde surface principale de la première couche d'électrode à la zone de l'ouverture dans une première surface principale sur le côté inverse étant de 0,7 ou plus.
PCT/JP2020/024716 2019-06-28 2020-06-24 Élément optique, réseau de microlentilles et système d'affichage utilisant un réseau de microlentilles Ceased WO2020262426A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2019-122263 2019-06-28
JP2019122263 2019-06-28
JP2020-107457 2020-06-23
JP2020107457A JP2021009364A (ja) 2019-06-28 2020-06-23 光学素子、マイクロレンズアレイ、及びマイクロレンズアレイを用いた表示システム

Publications (1)

Publication Number Publication Date
WO2020262426A1 true WO2020262426A1 (fr) 2020-12-30

Family

ID=74061748

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2020/024716 Ceased WO2020262426A1 (fr) 2019-06-28 2020-06-24 Élément optique, réseau de microlentilles et système d'affichage utilisant un réseau de microlentilles

Country Status (1)

Country Link
WO (1) WO2020262426A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021166832A1 (fr) * 2020-02-19 2021-08-26 日東電工株式会社 Appareil d'affichage et procédé d'affichage

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006064951A (ja) * 2004-08-26 2006-03-09 Fuji Photo Film Co Ltd 光学素子、レンズユニット、および撮像装置
WO2009123606A1 (fr) * 2008-03-31 2009-10-08 Louisiana Tech Univ. Research Foundation As A Division Of The Louisiana Tech Univ. Foundation, Inc. Système de lentille à longueur focale variable et grand angle
WO2016133278A1 (fr) * 2015-02-17 2016-08-25 한국기술교육대학교 산학협력단 Lentille accordable à base de polymère, polymère électro-actif associé, et son procédé de fabrication

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006064951A (ja) * 2004-08-26 2006-03-09 Fuji Photo Film Co Ltd 光学素子、レンズユニット、および撮像装置
WO2009123606A1 (fr) * 2008-03-31 2009-10-08 Louisiana Tech Univ. Research Foundation As A Division Of The Louisiana Tech Univ. Foundation, Inc. Système de lentille à longueur focale variable et grand angle
WO2016133278A1 (fr) * 2015-02-17 2016-08-25 한국기술교육대학교 산학협력단 Lentille accordable à base de polymère, polymère électro-actif associé, et son procédé de fabrication

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021166832A1 (fr) * 2020-02-19 2021-08-26 日東電工株式会社 Appareil d'affichage et procédé d'affichage

Similar Documents

Publication Publication Date Title
TW512240B (en) Optically functional sheet and surface light source using the same as well as image display device
CN101556341B (zh) 光学装置、照明设备以及相机
JP7233082B2 (ja) 光学素子、マイクロレンズアレイ、及び光学素子の作製方法
US7746540B2 (en) Electrowetting display devices and fabrication methods thereof
WO2018112883A1 (fr) Lentille optique, module de caméra et terminal
CN101672990A (zh) 一种变焦液晶透镜
US7535626B2 (en) Shape-variable optical element, optical device and image pickup apparatus
CN111751910A (zh) 一种基于介电弹性体的液体透镜变焦成像方法及系统
JP2021009364A (ja) 光学素子、マイクロレンズアレイ、及びマイクロレンズアレイを用いた表示システム
CN101388365A (zh) 制造显示装置的方法
CN101097264B (zh) 可调焦距的透镜
Xu et al. Fabrication of large micro-structured high-numerical-aperture optofluidic compound eyes with tunable angle of view
WO2020262426A1 (fr) Élément optique, réseau de microlentilles et système d'affichage utilisant un réseau de microlentilles
JP4770510B2 (ja) 光学素子及びその製造方法
CN115390352B (zh) 一种抗光幕布及其制备方法
JP5029140B2 (ja) 可変形状光学素子、光学装置、及び撮像装置
JP2019120948A (ja) 光学素子、及び光学素子の作製方法
CN112020697A (zh) 触控基板及其驱动方法、制作方法、触控组件、装置
KR20100048697A (ko) 가변 초점 렌즈 및 이를 이용한 촬상 장치
CN110780368B (zh) 一种自适应液体透镜及其制作方法
WO2019131925A1 (fr) Élément optique, réseau de microlentilles et procédé de production d'élément optique
WO2020138242A1 (fr) Matériau de déplacement électrique, élément optique l'utilisant, réseau de microlentilles et procédé de développement d'élément optique
CN114839761A (zh) 一种基于介电弹性驱动的非均匀变焦曲面复眼阵列
CN102053362A (zh) 液体透镜阵列及其灌注方法
WO2019131933A1 (fr) Élément optique et procédé de production d'élément optique

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 20831979

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 20831979

Country of ref document: EP

Kind code of ref document: A1