WO2021091275A1 - Structure de film de commande à angle de vision variable et procédé de fabrication associé - Google Patents

Structure de film de commande à angle de vision variable et procédé de fabrication associé Download PDF

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Publication number
WO2021091275A1
WO2021091275A1 PCT/KR2020/015442 KR2020015442W WO2021091275A1 WO 2021091275 A1 WO2021091275 A1 WO 2021091275A1 KR 2020015442 W KR2020015442 W KR 2020015442W WO 2021091275 A1 WO2021091275 A1 WO 2021091275A1
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WO
WIPO (PCT)
Prior art keywords
viewing angle
region
variable
substrate
control film
Prior art date
Application number
PCT/KR2020/015442
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English (en)
Korean (ko)
Inventor
김철암
이동진
송진석
Original Assignee
엔스펙트라 주식회사
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Publication of WO2021091275A1 publication Critical patent/WO2021091275A1/fr

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    • 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 
    • G02F1/165—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 translational movement of particles in a fluid under the influence of an applied field
    • G02F1/1675—Constructional details
    • G02F1/1677—Structural association of cells with optical devices, e.g. reflectors or illuminating devices
    • 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 
    • G02F1/165—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 translational movement of particles in a fluid under the influence of an applied field
    • G02F1/166—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 translational movement of particles in a fluid under the influence of an applied field characterised by the electro-optical or magneto-optical effect
    • G02F1/167—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 translational movement of particles in a fluid under the influence of an applied field characterised by the electro-optical or magneto-optical effect by electrophoresis
    • 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 
    • G02F1/165—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 translational movement of particles in a fluid under the influence of an applied field
    • G02F1/1675—Constructional details
    • G02F1/1676—Electrodes
    • 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 
    • G02F1/165—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 translational movement of particles in a fluid under the influence of an applied field
    • G02F1/1675—Constructional details
    • G02F2001/1678—Constructional details characterised by the composition or particle type
    • 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
    • G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/08—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 light absorbing layer
    • 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
    • G02F2203/00—Function characteristic
    • G02F2203/03—Function characteristic scattering

Definitions

  • the present invention relates to a structure and a control method of an adjustment film capable of subdividing a viewing angle adjustment width or widening a displayed viewing angle in a viewing angle variable adjustment film using electrophoresis technology, and a manufacturing method thereof.
  • FIG. 1 is a cross-sectional view showing an adjustment film for limiting a fixed viewing angle used in a conventional display.
  • control film is a product that is attached to the display to block the gaze of others other than the user, and can be used in various ways such as bank teller machines, PCs, laptops, tablet PCs, and smartphones that require personal information protection.
  • a control film capable of selecting and controlling information control and sharing according to the user's usage environment and the apps and contents to be applied. Is being demanded.
  • 2A and 2B are cross-sectional views illustrating an adjustment film for limiting an active viewing angle used in a conventional display.
  • two backlights 202 and 203 are used in the display terminal 200, and a specific pattern is applied to the control film 201 to actively adjust the diffraction and dispersion of transmitted light.
  • the viewing angle control method can turn ON/OFF the fixed viewing angle limit range depending on the usage environment, but it is difficult to subdivide the viewing angle range, increase the manufacturing cost of the terminal, and the visibility generated in the pattern to control the diffraction angle of transmitted light. It has a disadvantage in that it may cause problems such as a decrease and an increase in power consumption.
  • the problem to be solved by the present invention is, in a viewing angle adjustment film using electrophoresis technology, the viewing angle can be subdivided and limited or widened according to the intensity and direction of the applied voltage, compared to the prior art, and transmittance, visibility, and wide viewing angle It is to provide a structure of a film capable of improving or improving characteristics such as a limited range and power consumption, a control method thereof, and a manufacturing method thereof.
  • the viewing angle variable control film includes an upper substrate, a lower substrate, an upper electrode disposed on one surface of the upper substrate, a lower electrode disposed on one surface of the lower substrate, and between the upper and lower substrates. And a transmission region that transmits all light emitted from the display unit and a variable viewing angle region that blocks light, and the variable viewing angle region includes ink in which particles absorbing light and having electric charges are dispersed in a transparent fluid.
  • the transmissive region is an empty space or formed of a transparent material so that light can be transmitted
  • the variable viewing angle region includes: a) when the transmissive region is formed of a transparent material, the transparent space between the transmissive regions is Charged particles are formed by filling the ink dispersed in a transparent fluid.b) When the transmission region is an empty space, the charged particles fill and seal the ink dispersed in the transparent fluid in an isolation space made of a partition wall. It can be formed in a shape.
  • the particles having a charge dispersed in the transparent fluid When the particles having a charge dispersed in the transparent fluid are entirely dispersed in the viewing angle variable region, all the particles absorb and block all the light incident to the viewing angle variable region, and transmit only light having straightness passing through the transmission region.
  • the viewing angle range from the side can be narrowed.
  • the particles having electric charges dispersed in the transparent fluid move in the direction of the lower electrode within the viewing angle variable region, the light emitted from the display unit is scattered or diffused when passing through the transmission region, and light incident on the viewing angle variable region is removed. Through transmission, the range of the viewing angle viewed from the side can be widened.
  • An area occupied by the transmission area as a whole of the viewing angle control film is larger than an area occupied by the viewing angle variable area, and the pattern of the viewing angle variable area may be formed in a straight line, a rectangle, a square shape, or a honeycomb shape.
  • the transmissive region may include particles made of a transparent material such as a transparent binder, resin, or photoresist, and a material capable of scattering or diffusing light.
  • the transmissive region may be formed by mixing a UV blocking material with a transparent material such as a transmissive binder, resin, or photoresist, or by mixing particles made of a material capable of scattering or diffusing light and a UV blocking material together.
  • bistableness may be improved by mixing the charged particles with the same charged particles as the charged particles or by mixing the transparent resistor particles having no charge.
  • sealing layer formed in a region in contact with the upper electrode and the variable viewing angle region or in a region in contact with the lower electrode and the variable viewing angle region, and a conductive adhesive layer for attaching the sealing layer to the upper substrate or the lower substrate.
  • the viewing angle variable region and the entire area in contact with the transmissive region further include a sealing layer formed in a region in contact with the upper electrode or the lower electrode, and a conductive adhesive layer for attaching the sealing layer to the upper substrate or the lower substrate.
  • a sealing layer formed in a region in which the viewing angle variable region and the transparent region are in contact with the upper electrode or the lower electrode may simultaneously serve as a conductive adhesive layer for attaching to the upper or lower substrate.
  • An optically transparent first adhesive layer for attaching the display to the display may be formed under the lower substrate.
  • a separate first release film or a first protective film may be formed under the optically transparent first adhesive layer.
  • an optically transparent second adhesive layer may be formed on the upper substrate as well.
  • a separate second release film or a second protective film may be formed to attach a touch screen or a barrier film on the optically transparent second adhesive layer formed on the upper substrate.
  • the viewing angle variable control film includes an upper substrate, a lower substrate, an upper electrode disposed on one surface of the upper substrate, a lower electrode disposed on one surface of the lower substrate, and between the upper and lower substrates. And a transmission region that transmits all light emitted from the display unit and a variable viewing angle region that blocks light, and the variable viewing angle region includes ink in which particles absorbing light and having electric charges are dispersed in a transparent fluid. And one of the upper electrode and the lower electrode may be patterned only in a variable viewing angle region.
  • the viewing angle variable control film includes an upper substrate, a lower substrate, an upper electrode disposed on one surface of the upper substrate, a lower electrode disposed on one surface of the lower substrate, and between the upper and lower substrates. And a transmission region that transmits all light emitted from the display unit and a variable viewing angle region that blocks light, and the variable viewing angle region includes ink in which particles absorbing light and having electric charges are dispersed in a transparent fluid.
  • the variable viewing angle region includes ink in which particles absorbing light and having electric charges are dispersed in a transparent fluid.
  • the viewing angle variable control film includes an upper substrate, a lower substrate, an upper electrode disposed on one surface of the upper substrate, a lower electrode disposed on one surface of the lower substrate, and between the upper and lower substrates. And a transmission region that transmits all light emitted from the display unit and a variable viewing angle region that blocks light, and the variable viewing angle region includes ink in which particles absorbing light and having electric charges are dispersed in a transparent fluid.
  • the variable viewing angle region includes ink in which particles absorbing light and having electric charges are dispersed in a transparent fluid.
  • a viewing angle adjustment range may be extended, and a viewing angle may be adjusted for each region.
  • a method of manufacturing a variable viewing angle control film includes forming an upper electrode on one surface of an upper substrate, forming a lower electrode on one surface of a lower substrate, and a display between the upper and lower substrates. Including the step of forming a transmission region that transmits all light emitted from the display unit and a viewing angle variable region that blocks light, wherein the viewing angle variable region includes ink in which particles absorbing light and having electric charges are dispersed in a transparent fluid. can do.
  • the structure and control method of the viewing angle variable control film according to the present invention, and the method of manufacturing the same can actively narrow or widen the viewing angle by adjusting the direction of the applied voltage, the size of the pulse, the width of the pulse, the repetition period, and the frequency.
  • it has the advantage of subdividing the viewing angle by the difference in the transparent space generated as particles move from the top to the bottom electrode.
  • the structure and control method of the viewing angle variable control film according to the present invention, and the method of manufacturing the same, have the advantage of being able to be grafted to various apps or contents since the viewing angle can be selectively narrowed or widened only in a specific area.
  • the structure and control method of the viewing angle variable control film according to the present invention, and the method of manufacturing the same have bistableness that maintains the final position even when the particles block voltage and do not require an additional backlight, compared to the prior art. , It has the advantage of reducing power consumption.
  • the structure and control method of the viewing angle variable control film according to the present invention, and the method of manufacturing the same, have the advantage of improving transmittance and visibility compared to the prior art, as a geometric pattern for adjusting the diffraction angle of light is not required.
  • the structure and control method of the viewing angle variable control film according to the present invention, and the method of manufacturing the same, compared to the prior art, are manufactured in the case of a capsule form when the viewing angle variable control film is manufactured, because the manufacturing process is simple and a separate sealing layer is not required It has the effect of reducing cost.
  • the viewing angle variable control film according to the present invention has the effect of widening the viewing angle viewed from the side by using scattering or diffusing material particles in the transmission region.
  • Viewing angle variable control film by mixing a UV blocking material in the transmissive region or a scattering material or a diffusion material and a UV blocking material together to prevent or weaken the discoloration of the film due to UV exposure for a long time to improve the lifespan It has an effect that can be made.
  • FIG. 1 is a cross-sectional view showing an adjustment film for limiting a fixed viewing angle used in a conventional display.
  • 2A and 2B are cross-sectional views illustrating an adjustment film for limiting an active viewing angle used in a conventional display.
  • 3a, b, c, and d are cross-sectional views showing the structure of a viewing angle variable control film according to an embodiment of the present invention.
  • FIGS. 4A and 4B are cross-sectional views illustrating a method of adjusting a viewing angle in a viewing angle variable control film according to an embodiment of the present invention.
  • 5A, b, c, and d are plan views illustrating a pattern structure of a transmission region and a variable viewing angle region according to an exemplary embodiment of the present invention.
  • FIG. 6a, b, c, and d are cross-sectional views showing the structure of a viewing angle variable control film according to an embodiment of the present invention.
  • FIG. 7A is a schematic diagram illustrating a principle of light scattering of a light scattering material 711 of a variable viewing angle control film for widening a viewing angle according to an embodiment of the present invention.
  • FIG. 7B is a cross-sectional view of a viewing angle variable control film for increasing a viewing angle according to an embodiment of the present invention.
  • FIG. 8a, b, and c are cross-sectional views of a viewing angle variable control film for adjusting a viewing angle only in a selective area in an area in which information or an image is displayed, according to an embodiment of the present invention.
  • FIG. 9 is a cross-sectional view of a viewing angle variable control film for adjusting a moving speed of particles and improving bistableness according to an embodiment of the present invention.
  • FIGS. 10a, b, and c are cross-sectional views of a viewing angle variable control film according to an embodiment of the present invention.
  • FIG. 11a, b, c, and d are cross-sectional views of a viewing angle variable control film according to an embodiment of the present invention.
  • FIG. 12a, b, c, and d are cross-sectional views of a microcapsule-type viewing angle variable control film according to an embodiment of the present invention.
  • 13A and 13B are optical micrographs of a microcapsule-type viewing angle variable control film prepared according to an embodiment of the present invention, and are photographs observed at 850 times magnification using an ICAMSCOPE PRO optical microscope of Sometech Vision.
  • FIG. 14a, b, c, d, and e are cross-sectional views of a microcapsule-type viewing angle variable control film according to an embodiment of the present invention.
  • FIG. 15 is a cross-sectional view of a microcapsule-type viewing angle variable control film for widening a viewing angle according to an embodiment of the present invention.
  • 3a, b, c, and d are cross-sectional views showing the structure of a viewing angle variable control film according to an embodiment of the present invention.
  • FIGS. 4A and 4B are cross-sectional views illustrating a method of adjusting a viewing angle in a viewing angle variable control film according to an embodiment of the present invention.
  • the present invention is a viewing angle variable control film using the principle of electrophoresis, showing a typical structure of the control film and the principle and method of adjusting the viewing angle.
  • the viewing angle adjustment film includes a transmission area 302 through which all light emitted from the display unit 300 can be transmitted for information display, and a variable viewing angle area capable of blocking light ( It is divided into 303, and the transmissive region 302 and the variable viewing angle region 303 have a structure positioned between the two transparent electrodes 306 and 307.
  • the transmission region 302 is formed of an empty space or a transparent material so that light can be transmitted.
  • the variable viewing angle region 303 is formed in a form in which particles 308 that absorb light and exhibit electric charges are filled with ink dispersed in a transparent fluid 309 and sealed, and at this time, the transmissive region 302 may be formed of a transparent material.
  • an empty space is placed between the transmissive areas to fill the ink in which particles are dispersed, or when the transmissive area is composed of an empty space, a separate isolation space is provided with a partition wall 310 to fill and seal the ink.
  • the light is scattered or diffused to the side of the viewing angle variable region 303
  • the particles 308 dispersed in the transparent fluid 309 are entirely dispersed within the variable viewing angle region 303, the light incident on the variable viewing angle region 303 as shown in FIG. 4A All the particles 308 to be heard are absorbed and blocked, and only light having a straightness passing through the transmission region 303 is transmitted, so that the viewing angle range viewed from the side is narrowed as shown in FIG. 3A.
  • 5A, b, c, and d are plan views illustrating a pattern structure of a transmission region and a variable viewing angle region according to an exemplary embodiment of the present invention.
  • the viewing angle variable control film when the viewing angle variable control film is viewed from the front, it is a pattern form of a transmission area and a variable viewing angle area, and the area occupied by the transmission area 502 as a whole is occupied by the viewing angle variable area 503. It is wider than the area, and the pattern of the viewing angle variable area 503 can be designed and manufactured in a straight line (Fig. 5a), a rectangle (Fig. 5b), a square (Fig. 5c), a honeycomb (Fig. 5d), etc., and the display
  • the display unit may be designed and manufactured in a shape similar to or identical to that of a unit cell or a subcell, and a black matrix (BM).
  • FIG. 6a, b, c, and d are cross-sectional views showing the structure of a viewing angle variable control film according to an embodiment of the present invention.
  • particles 608 having electric charges are The direction or speed at which the particles move varies depending on the intensity and the like.
  • the intensity of the voltage in the viewing angle variable region 603 filled with the particles 608 dispersed in the transparent fluid 609 The positive sign threshold voltage (V1) at which the particles start to move is applied to the lower electrode 606 for a certain time (t3), or the particles 608 are transferred from the upper electrode 607 to the lower electrode 606.
  • V3 A positive driving voltage (V3) is applied with the strength of the voltage that can move all, but by adjusting the pulse width, the time required for the particles 608 to move from the upper electrode 607 to the lower electrode 606 is less than the time required.
  • the particles When a voltage is applied for a short period of time t1, the particles start to move to the lower electrode 606, and in the direction of the upper electrode 607, the particles 608 move and only the transparent fluid 609 is left.
  • the scattered light is transmitted through the space, and the viewing angle from the side begins to widen.
  • the particles 608 are By moving to the lower electrode 606, the particles 608 move in the direction of the upper electrode 607, and the space where only the transparent fluid 609 remains is further expanded, so that the viewing angle from the side is wider.
  • the driving voltage V3 when the driving voltage V3 is applied during a time (t3) during which all particles can move from the upper electrode 607 to the lower electrode 606, all the particles 608 are positioned as the lower electrode 606 and are located at the side surface.
  • the viewing angle that can be seen from is widened to the maximum. If the intensity of the applied voltage (pulse size) and the application time (pulse width) are further subdivided, the viewing angle viewed from the side can also be subdivided.
  • the particles 608 are formed in the upper electrode 607.
  • the lower electrode 606 may have an effect of dispersing the particles 608 in the variable viewing angle region 603 electrically.
  • the electrical dispersion state of the particles varies according to the applied frequency, and all light scattered by the particles 608 electrically dispersed in the viewing angle variable region 603 is absorbed, so that the viewing angle viewed from the side is narrowed to a maximum value.
  • FIG. 7A is a schematic diagram illustrating a principle of light scattering of a light scattering material 711 of a variable viewing angle control film for widening a viewing angle according to an embodiment of the present invention.
  • FIG. 7B is a cross-sectional view of a viewing angle variable control film for increasing a viewing angle according to an embodiment of the present invention.
  • the transmission region 702 is formed by drying or curing, light emitted from the display and incident light may be scattered or diffused by the scattering or diffusing material particles 711, thereby increasing a viewing angle viewed from the side.
  • the transmissive area 702 is formed by mixing a UV-blocking material instead of a material that scatters or diffuses light, or by mixing a scattering material or a diffusion material and a UV-blocking material together, discoloration of the film due to UV exposure for a long time is prevented or weakened. So that the lifespan can be improved.
  • FIG. 8a, b, and c are cross-sectional views of a viewing angle variable control film for adjusting a viewing angle only in a selective area in an area in which information or an image is displayed, according to an embodiment of the present invention.
  • the electrodes are matched one-to-one with the variable viewing angle region for patterning, or, as shown in Fig. 8B, one electrode of the upper electrode 807 or the lower electrode 806 is used as the viewing angle variable region and the transmission region.
  • respective driving voltages can be applied or blocked, so that the viewing angle for each region can be adjusted.
  • each viewing angle variable region 803 if one of the upper electrode 807 or the lower electrode 806 is patterned in two or more within each viewing angle variable region 803, the viewing angle can be adjusted for each region as well as the viewing angle.
  • the range can also be expanded.
  • FIG. 9 is a cross-sectional view of a viewing angle variable control film for adjusting a moving speed of particles and improving bistableness according to an embodiment of the present invention.
  • the transparent fluid 909 is mixed and dispersed with particles 908 that have a charge and transparent particles 912 that have the same charge as the particles or do not have a specific charge.
  • the transparent material particles 912 act as resistors to reduce the moving speed of the particles 908, so that the range of the viewing angle is widened by adjusting the moving speed of the particles 908, or the particles 908 are caused by inertia immediately after the voltage is cut off. It is possible to improve the bistableness of stably maintaining the state in which the particles 908 are finally located even after further movement is suppressed or the voltage is cut off.
  • FIGS. 10a, b, and c are cross-sectional views of a viewing angle variable control film according to an embodiment of the present invention.
  • a sealing layer 1013 may be formed in a region where 1006 and the variable viewing angle region 1003 contact each other.
  • the structure is the same as that of FIG. 10A, but the sealing layer 1013 may be formed over the entire area in contact with the transmission area 1002 and the variable viewing angle area 1003.
  • FIG. 11a, b, c, and d are cross-sectional views of a viewing angle variable control film according to an embodiment of the present invention.
  • a transparent adhesive film such as an optically clear adhesive (OCA) under the viewing angle adjustment film 1101
  • OCA optically clear adhesive
  • the first adhesive layer 1115 may be formed, and as shown in FIG. 11B, before attaching to the display unit 1100, a separate first release film or a first protective film 1116 is used to prevent the inflow of contaminants from the outside. ) Can be attached.
  • a transparent second adhesive layer 1119 such as an optically clear adhesive (OCA) may be formed, and as shown in FIG. 11D, contaminants, etc. from the outside before attaching to the touch screen 1117 or the barrier film.
  • OCA optically clear adhesive
  • a separate second release film or a second protective film 1120 may be attached to prevent the inflow.
  • FIG. 12a, b, c, and d are cross-sectional views of a microcapsule-type viewing angle variable control film according to an embodiment of the present invention.
  • variable viewing angle region 1203 is a region of the microcapsule 1218 including ink in which particles that absorb light and exhibit electric charges are dispersed in a transparent fluid.
  • the variable viewing angle region 1203 may be formed after curing or drying by coating only on a selected region forming the variable viewing angle region 1203 using a screen printing process by mixing a transparent binder material with the microcapsules 1218.
  • the particles 1208 and the fluid 1209 do not leak to the outside because the microcapsule 1218 itself serves as a sealing layer, and the microcapsules 1218 coated on the viewing angle variable region 1203 are single as shown in FIG. 12A. Coated with layered microcapsules 1218, or
  • each driving voltage is applied to each patterned electrode 1206, or It can be blocked, so it is possible to adjust the viewing angle for each area.
  • a single layer of microcapsules 1218 is coated, but two microcapsules 1218 are formed in each viewing angle variable region 1203, and a lower electrode 1206 selectively in the viewing angle variable region 1203 Can be formed.
  • a separate conductive adhesive layer 1014 may be formed in contact with a region where the sealing layer 1013 is exposed.
  • the microcapsules 1218 may be coated with a plurality of layers between the upper electrode 1207 and the lower electrode 1206.
  • the transmissive region 1202 may be formed of an empty space or a transparent material so that light may be transmitted.
  • 13A and 13B are optical micrographs of a microcapsule-type viewing angle variable control film prepared according to an embodiment of the present invention, and are photographs observed at 850 times magnification using an ICAMSCOPE PRO optical microscope of Sometech Vision.
  • white electrophoretic nanoparticles having a charge were dispersed in a transparent fluid and then microencapsulated.
  • the prepared microcapsules were mixed with a binder and coated on the surface of the conductive material of the first ITO film, followed by drying to form a microcapsule layer.
  • a conductive adhesive layer was attached to the prepared microcapsule layer, and a second ITO film was laminated with the conductive adhesive layer to prepare a viewing angle variable control film.
  • the microcapsule layer is white electrophoretic particles. It can be seen that the light is reflected by and represents white, and the other empty spaces are transmitted through the light to represent a dark image.
  • white electrophoretic nanoparticles having a charge were dispersed in a transparent fluid and then microencapsulated.
  • the prepared microcapsules were mixed with a binder and coated on the first ITO film.
  • the coating process was performed so that the microcapsule layers were long coated with a width of less than about 22 um using a mask exposed to a width of 25 um.
  • a conductive adhesive layer was attached, and a second ITO film was laminated with the conductive adhesive layer to prepare a viewing angle variable control film. At this time, areas other than the microcapsule layer were formed as empty spaces.
  • the microcapsule layer is white electrophoretic particles.
  • the light is reflected by and represents white, and the other empty spaces are transmitted through the light to represent a dark image.
  • the empty spaces other than that are transmitted through the light to represent a dark image is a region through which light of the light emitting display is transmitted, and instead of white electrophoretic particles that scatter or reflect light, black electrophoretic particles that absorb all light may be applied.
  • FIG. 14a, b, c, d, and e are cross-sectional views of a microcapsule-type viewing angle variable control film according to an embodiment of the present invention.
  • variable viewing angle region 1403 may be formed after curing or drying by coating only a selected region forming the variable viewing angle region 1403 by mixing a transparent binder material with the microcapsules 1218 and using a screen printing process or the like.
  • a separate conductive adhesive layer 1414 may be formed in contact with the lower portion of the microcapsule 1418.
  • a separate first release film or first protection to prevent the inflow of contaminants, etc. from the outside before attaching various application elements or parts such as a touch screen or a barrier film, under the conductive adhesive layer 1414 A film 1416 may be attached.
  • an optically transparent adhesive film (Optically Clear) on the upper substrate 1405 of the viewing angle adjustment film 1401
  • a transparent second adhesive layer 1419 such as adhesive, OCA
  • a separate second release film or a second protective film to prevent the inflow of contaminants, etc. from the outside before attaching to the touch screen or barrier film
  • the 1420 may be attached on the second adhesive layer 1419.
  • FIG. 14D as a modified form of FIG. 14B, in order to be used as a touch screen, a barrier film, or a viewing angle control protective film for various display devices, without a conductive adhesive layer 1414 under the microcapsule 1418, A first release film or a first protective film 1416 for preventing the inflow of contaminants or the like may be attached thereto.
  • an optically transparent first adhesive layer 1415 for attaching the display unit is formed under the lower substrate 1404, and is optically transparent.
  • a separate first release film or a first protective film 1416 is formed on the lower portion 1415 of the first adhesive layer, and an optically transparent second adhesive layer 1419 for attaching a touch screen to the upper substrate 1415 Is formed on the top of the second adhesive layer 1419, and on the top of the second adhesive layer 1419, a separate second release film or a second protective film 1420 is provided to prevent the inflow of contaminants from the outside before being attached to the touch screen or the barrier film. ) Can be formed.
  • the driving method for subdividing and adjusting the viewing angles of Figs. 6a, b, c, and d can also be applied to the microcapsule type.
  • an electric field is formed from the outside of the particles having a charge in the microcapsule, the direction in which the particles move or the speed at which the particles move varies depending on the direction of the electric field and the strength of the electric field.
  • the method of improving the bistableness of FIG. 9 can also be applied to a microcapsule type.
  • Inks dispersed by mixing transparent particles with charged particles in a transparent fluid and transparent particles having the same charge as the particles or not having a specific charge are microencapsulated.
  • the transparent material particles act as a resistor to reduce the moving speed of the particles, so that the range of the viewing angle is widened by controlling the moving speed of the particles, or the particles are prevented from moving further by inertia immediately after the voltage is cut off, or the particles are Finally, it is possible to improve the bistableness of stably maintaining the positioned state.
  • FIG. 15 is a cross-sectional view of a microcapsule-type viewing angle variable control film for widening a viewing angle according to an embodiment of the present invention.
  • the mixture is coated and dried.
  • the transmissive region 1502 is formed by curing, the light emitted and incident from the display may be scattered or diffused by the scattering or diffusing material particles 1511, thereby increasing a viewing angle viewed from the side.
  • the transmissive area 1502 is formed by mixing a UV-blocking material instead of a material that scatters or diffuses light, or by mixing a scattering material or a diffusion material and a UV-blocking material together, discoloration of the film due to UV exposure for a long time is prevented or weakened. So that the lifespan can be improved.
  • the variable viewing angle control film may be used in manufacturing all display devices having a display application capable of adjusting the viewing angle by attaching a display unit to the lower portion or attaching a touch screen or a barrier film to the upper portion.
  • Display devices including the display unit include CRT (Cathode Ray Tube), FPD (Flat Panel Display), LCD (Liquid Crystal Display), PDP (Plasma Display Panel), LED (Light Emitting Diode), OLED (Organic Light-Emitting). Diode), E-Paper, etc. can be applied.
  • the viewing angle variable control film according to the present invention is made of a composite material in which a solid and a liquid material are mixed.
  • the upper substrate and the lower substrate are light-transparent materials having high transmittance, and may be base films formed of a material having a high transmittance of 80% or more.
  • the upper substrate is a transparent polymer film with excellent light transmittance, and includes polyethersulfone (PES), polyacrylate (PAR), polyetherimide (PEI), polyethylene naphthalate (PEN, polyethyelenen napthalate), It can be formed from polyethylene terephthalide (PET, polyethyeleneterepthalate), polyphenylene sulfide (PPS), polyallylate, polyimide, polycarbonate (PC), cellulose triacetate (TAC), etc. However, it is not limited thereto.
  • An upper electrode may be provided on one surface of the upper substrate facing the lower substrate.
  • the upper electrode may apply the same voltage to the viewing angle variable control film.
  • the upper electrode may be a common electrode formed in a plate shape so as to be common to the viewing angle variable control film.
  • the upper electrode may be provided on the viewer's side, such as indium tin oxide (ITO), indium zinc oxide (IZO), indium zinc tin oxide (IZTO), aluminum zinc oxide (AZO), ZnO or transparent conductive oxide (TCO). It may be formed of a transparent conductive material.
  • Fluids include water, methanol, ethanol, propanol, butanol, propylene carbonate, toluene, benzene, hexane, and chloroform.
  • Chloroform isoparaffin oil, silicone oil, ester oil, hydrocarbon oil triethylhexanoine, dimethicone, cetyl otanoate, dicaprylate, isopropyl myristate, tocophenol acetate, etc. It may contain a transparent material.
  • the microcapsules may be fixed at predetermined intervals in the binder layer to form a space between the microcapsules. Due to the spaced space, each microcapsule does not directly contact neighboring microcapsules.
  • the binder layer may include a material that is at least partially transparent in the visible light region of 380 nm to 750 nm.
  • the binder layer may include at least one transparent polymer material selected from the group consisting of acrylic polymers, silicone polymers, ester polymers, urethane polymers, amide polymers, ether polymers, fluorine polymers, and rubbers.
  • an appropriate polymer such as an acrylic polymer or a silicone polymer, polyester, polyurethane, and polyether can be used.
  • an adhesive layer (or pressure-sensitive adhesive layer) not only a simple adhesive (or adhesive) action, but also a high elastic silicone rubber, which serves as a cushion to alleviate impact, may be used.
  • the adhesive layer (or pressure-sensitive adhesive layer) may be cured by energy (eg, heat or UV, etc.) or may be uncured.
  • the adhesive layer may be an insulating organic material, polyether sulfone (PES, polyethersulphone), polyacrylate (PAR, polyacrylate), polyether imide (PEI, polyetherimide), polyethylene naphthalate ( PEN, polyethyelenen napthalate), polyethylene terephthalide (PET, polyethyeleneterepthalate), polyphenylene sulfide (PPS), polyallylate, polyimide, polycarbonate (PC), cellulose triacetate (TAC) ) Or the like, but is not limited thereto.
  • PES polyether sulfone
  • PAR polyacrylate
  • PEI polyether imide
  • PEN polyethylene naphthalate
  • PET polyethyelenen napthalate
  • PET polyethylene terephthalide
  • PPS polyphenylene sulfide
  • PPS polyallylate, polyimide, polycarbonate (PC), cellulose triacetate (TAC) ) Or the like, but is not
  • the lower substrate may be a flexible substrate that can be bent, bent, or rolled, and in this case, the lower substrate may be a flexible printed circuit board.
  • the present invention is not limited thereto, and the lower substrate may be made of a phenol-based or epoxy-based synthetic resin, and the lower substrate may be a rigid printed circuit board.
  • a lower electrode may be provided on one surface of the lower substrate. The lower electrode may apply the same or different voltages to the plurality of microcapsules or particles.
  • the lower electrode is a single layer structure of copper, aluminum, indium tin oxide (ITO) or indium zinc oxide (IZO), or nickel or gold is further laminated on a material of copper, aluminum, ITO, or IZO. It can be formed in a multi-layered structure.
  • Microcapsules may be soft capsules or hard capsules, and may be manufactured by in-situ polymerization, coacervation approach, or interfacial polymerization.
  • a polar or non-polar dispersion medium may be used as the fluid.
  • the fluid For example, water, methanol, ethanol, propanol, butanol, propylene carbonate, toluene, benzene, chloroform, hexane, cyclohexane, dodecane, perchlorethylene, trichloroethylene, isopar-G, isopar, a kind of isoparaffin oil. Any one or more of -M and isopar-H can be used.
  • microcapsules can be prepared through a reaction process in which an emulsion is formed and structured in a core-shell form.
  • the particles are dispersed in a fluid to prepare a core material.
  • the particles may be dispersed in a proportion of 0.1 to 25% by weight with respect to the fluid, but a larger amount may be dispersed if necessary.
  • the dispersion of the core material may be dispersed using an ultrasonic disperser or a homogenizer.
  • a prepolymer is prepared by mixing the polymer to form the shell of the microcapsule and adjusting the acidity. This process can be carried out simultaneously with the process of preparing the dispersion of the core material.
  • the polymer for forming the shell may be a polymer precursor capable of exhibiting low elasticity and hard properties, such as urea-formaldehyde, melamine-formaldehyde, methylvinylether comaleic anhydride, or a gelatin, polyvinyl Polymers such as alcohol, polyvinyl acetate, cellulosic derivatives, acacia, carrageenan, carboxymethylrelose, hydrolyzed styrene anhydride copolymer, agar, alginate, casein, albumin, cellulose phthalate, etc. can be used, and the hydrophilicity of these polymers By controlling the hyperhydrophobicity, it is possible to form a shell surrounding the core material.
  • the prepolymer may be dispersed in a fluid like particles to be prepared as a dispersion.
  • the prepared dispersion of the core material and the prepolymer dispersion of the shell material are mixed and stirred to form an emulsion.
  • a stabilizer may be added to improve dispersibility.
  • the particles may become a dispersed phase and the shell material may be a continuous phase.
  • additives may be added to increase the stability of the emulsion.
  • Such additives may be organic polymers having high viscosity after dissolving in an aqueous phase and having excellent wettability.
  • gelatin polyvinyl alcohol, sodium carboxymethyl cellulose, starch, hydroxyethyl cellulose, polyvinylpyrrolidone, alginate At least one of them can be used.
  • the core material dispersion can be microencapsulated by adjusting the pH and temperature of the formed emulsion so that the continuous phase shell material dispersion is deposited around the dispersed phase particles to form a microcapsule shell.
  • the microcapsule shell may include a process of adding an additive to increase the hardness of the shell by reducing the elasticity by configuring the microcapsule shell more densely.
  • the type of additive to be added may be an ionic or polar material that is easily soluble in an aqueous phase.
  • at least one of ammonium chloride, resorcinol, hydroquinone, and catechol, which is a curing catalyst, may be used.
  • an oily/aqueous emulsion on the inner and outer phases can be used.
  • the dispersion of the core material is coacervated (bulked) from the aqueous outer phase to the outside, and by controlling the temperature, pH, relative concentration, etc., a shell is formed in the oily droplets of the inner phase to form particles.
  • urea-formaldehyde melamine-formaldehyde, gelatin, or arabic rubber may be used.
  • the lipophilic monomer in the inner phase is present as an emulsion in the aqueous outer phase.
  • the monomer in the liquid crystal of the inner phase reacts with the monomer introduced into the aqueous outer phase, polymerization reaction occurs at the interface between the droplet of the inner phase and the surrounding aqueous outer phase, and a shell of particles is formed around the droplet.
  • the formed shell is relatively thin and permeable, but unlike other manufacturing methods, it does not require heating, so it has the advantage of being able to apply various dielectric fluids.
  • the elastic force of the microcapsules in contact with the electrode is strengthened to prevent external pressure or impact It has the durability to absorb.
  • the partition wall may be formed of a non-polar organic material or a non-polar inorganic material.
  • the partition wall may be formed through a photo lithography or mold printing process to have a predetermined height and width (eg, a height of 10 ⁇ m to 100 ⁇ m, a width of 10 ⁇ m to 20 ⁇ m).
  • the partition wall is made of a material that is not charged so that the particles charged by the electrical force and the partition wall are not coupled to each other during driving.
  • the fluid in which the charged particles are mixed is a non-polar organic solvent, it may be formed of a non-polar polymer, organic, or inorganic material, such as a fluid-like physical property. have.
  • the release film or protective film is coated with a silicone composition and inorganic particles exhibiting antistatic effect on one side or both sides of a polyester (PET) film, and has uniform peeling power, residual adhesion, and antistatic functions. It acts as a film to protect the adhesive layer or adhesive layer of.
  • PET polyester

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Abstract

La présente invention concerne un film de commande à angle de vision variable et un procédé de fabrication associé, le film de commande à angle de vision variable comprenant : un substrat supérieur ; un substrat inférieur ; une électrode supérieure située sur une surface du substrat supérieur ; une électrode inférieure située sur une surface du substrat inférieur ; et une zone de transmission et une zone d'angle de visualisation variable formée entre l'électrode supérieure et l'électrode inférieure, la zone de transmission permettant à la totalité de la lumière émise par une partie d'affichage de transmettre à travers celle-ci, et la zone d'angle de vision variable bloquant la lumière, la zone d'angle de vision variable comprenant une encre dans laquelle des particules absorbant la lumière et ayant des charges électriques ont été dispersées dans un fluide transparent.
PCT/KR2020/015442 2019-11-08 2020-11-06 Structure de film de commande à angle de vision variable et procédé de fabrication associé WO2021091275A1 (fr)

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