WO2003010569A2 - Filtre optique - Google Patents

Filtre optique Download PDF

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Publication number
WO2003010569A2
WO2003010569A2 PCT/US2002/023240 US0223240W WO03010569A2 WO 2003010569 A2 WO2003010569 A2 WO 2003010569A2 US 0223240 W US0223240 W US 0223240W WO 03010569 A2 WO03010569 A2 WO 03010569A2
Authority
WO
WIPO (PCT)
Prior art keywords
film
optical filter
tab
adhesive layer
layer
Prior art date
Application number
PCT/US2002/023240
Other languages
English (en)
Other versions
WO2003010569A3 (fr
Inventor
Kazuhiko Minami
Original Assignee
3M Innovative Properties Company
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 3M Innovative Properties Company filed Critical 3M Innovative Properties Company
Publication of WO2003010569A2 publication Critical patent/WO2003010569A2/fr
Publication of WO2003010569A3 publication Critical patent/WO2003010569A3/fr

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters

Definitions

  • the present invention relates to an optical filter comprising a film layer having an
  • optical film such as a louver film, an antireflection film, etc.
  • adhesive layer which
  • the optical filter of the present invention is preferably produced by bonding a double-coated adhesive tape (or a double-coated tape) with a tab, which comprises a flexible substrate with a tab and a repeelable adhesive layer.
  • optical filter of the present invention is repeelably adhered to an adherent
  • the optical filter functions as a privacy filter, which can prevent a person other than a user or an operator from peeping at the screen from the side direction.
  • a liquid crystal display (which may be named a liquid crystal display
  • liquid crystal display panel (screen) (hereinafter occasionally referred to as LCD).
  • liquid crystal panel and a light source, that is, a backlight which illuminates the
  • liquid crystal panel from its back surface (a surface opposite to the displaying surface).
  • the liquid crystal panel comprises a pair of first and second polarizing plates and a liquid crystal layer interposed between them.
  • the polarizing plates are placed so that the polarization axis of the first polarizing plate (the first polarization axis) and that of the second polarizing plate (the second polarization axis) form a certain angle, for example,
  • An example of the backlight is an edge-light type backlight
  • optical films is provided on the display screen.
  • the optical film has optical functions or protection effects to protect the screen from dirt or damage.
  • Examples of the optical film include an anti-reflection film (an optical film having an antireflection layer), a louver film
  • the liquid crystal display has transmitted through the liquid crystal panel, exits in directions (side directions) remote from the front direction of the display surface.
  • the liquid crystal display can be seen not only by a user or an operator positioned in the front direction but also by a person standing at a site in the side direction apart from the front direction. Therefore, it is
  • louver film is installed in the optical filter which is attached to the display screen so that the unnecessary propagation of the transmitted light beam from the liquid crystal panel in the side directions.
  • the louver film achieves such an effect that the louvers built in the film control the propagation directions of the light beams which are transmitted through the louver film in a specific exiting angle range.
  • Such a louver film is also named a light control film.
  • US RE27,617 discloses a method for producing a louver film by
  • the colored layers provide louver-form elements which collimate the light beam, and these elements can extend in the direction perpendicular to the surface of the louver
  • JP-A-8-224811 discloses the formation of a pressure-sensitive adhesive layer on at least one of the main surfaces (surface and back surface) of a louver film and the covering of the adhesive surface of the adhesive layer with a transparent protection plastic film to prevent the damage of the louver film in use.
  • the transparent plastic film may optionally
  • the pressure-sensitive adhesive layer used in the above patent comprises a pressure-sensitive adhesive containing a self-adherent polymer.
  • the self-adherent polymer is tacky at a room temperature (about 25°C).
  • the self-adherent polymer may be obtained by polymerizing a monomer composition which becomes an adhesive and preferably transparent state after polymerization.
  • the specific example of the self- adherent polymer disclosed in JP-A-8-224811 is a crosslinked self-adherent polymer
  • louver film is "LIGHT CONTROL
  • louver film Although not a louver film, it is known to repeelably adhere and fix a film layer having a transparent protective layer to a display screen.
  • JP-A-2000-56694 discloses a screen-protection film comprising a laminate of a transparent film layer having a light transmittance of at least 80 % and a rubber layer laminated on one surface of the film layer, characterized in that the light
  • the rubber layer is formed of one rubber selected from the group consisting of silicone rubber, fluororubber, acrylic rubber, ethylene-propylene rubber and acrylonitrile-butadiene rubber, or a mixture of two or more of them.
  • the protective film can be adhered to the display screen and repeelable.
  • the transparent film layer is made of a plastic film such as a polyester film, etc., it has better transparency than the louver film described above.
  • the commonly used plastic film has no antireflection function.
  • the liquid crystal display with adhering and fixing the optical filter to the screen.
  • the optical filter when the optical filter comprises the louver film, it functions as an optical filter which prevents the unnecessary exit of the light beams in the side directions (i.e. a privacy filter), and thus guards the privacy.
  • a repeelable adhesive layer to fix the optical filter to the adherent surface so that the optical filter can be easily fixed to the display screen and it may be detached at any desired time and refixed to the screen with ease.
  • the use of the repeelable adhesive layer achieves good results, but there still
  • This problem is that it is relatively difficult to detach the
  • optical filter once it is fixed to the display screen.
  • a liquid crystal panel is assembled in a monitor cover having a frame so that the periphery of
  • the liquid crystal panel is surrounded with the frame, and the liquid crystal panel is fixed to a specific position of the body of PC. With the display having the frame, a step is
  • the thickness of the optical filter is the same as or smaller than the height of the step, while the optical filter is usually fixed so that it covers the entire screen
  • optical filter can only be partly removed in the initial step of the
  • an optical filter comprising (a) a film layer which comprises an optical film and has a surface to be
  • optical filter being fixed to said adherent surface through said repeelable adhesive layer, wherein said optical filter further
  • Fig. 1 shows the method for producing the optical filter of the present invention and the steps for fixing the optical filter to a display.
  • Fig. 2 is a partial cross sectional view of a display to which the optical filter of
  • Fig. 3 is a cross sectional view of one embodiment of the double-coated tape with the tab according to the present invention.
  • Fig. 4 is a cross sectional view of another embodiment of the double-coated tape
  • Fig. 5 is a cross sectional view of a further embodiment of the double-coated tape
  • Fig. 6 is a plane view of a display screen to which the optical filter according to one embodiment of the present invention is fixed.
  • Fig. 7 is a plane view of the substrate with the tab of the optical filter according
  • Fig. 8 is a plane view of a display to which the optical filter according to another embodiment of the present invention is fixed.
  • Fig. 9 is a plane view of a display to which the optical filter according to a further embodiment of the present invention.
  • Fig. 10 shows one example of the method for producing the double-coated tape
  • Fig. 11 is a plane view of one preferable example of the double-coated tape with
  • the optical filter of the present invention is characterized in that it comprises (1) a film layer comprising an optical filter, (2) a repeelable adhesive layer which is fixedly
  • adhered to the adherent surface e.g. a display screen
  • a flexible tab which is fixedly provided on said film layer.
  • the repeelable adhesive layer facilitates the fixing of the optical filter to the adherent surface and also the detaching of the optical filter at any desirable occasion.
  • the tab Since the tab is flexible, it is easily flexed so that the tab and the adherent surface forms an
  • the optical filter can be detached from the adherent surface with ease by removing the optical filter with pinching the tab with fingers, even when a relatively small gap is formed between the inner periphery of the frame and the outer periphery of the optical filter. Furthermore, the optical filter comprising a less flexible optical film such as a louver film can be readily
  • the peeling force can be effectively applied to the optical filter to remove the optical filter from the adherent surface.
  • the repeelable adhesive layer may have repeeling properties such that the optical
  • the adhesive layer with such a filter can be peeled without damaging the adherent surface.
  • repeeling properties may be formed from a composition containing a crosslinked self- adherent polymer or a rubber polymer.
  • the repeelable adhesive layer has a peel strength of 0.1 to 4.5 N/25 mm against the
  • PET polyethylene terephthalate
  • the tab may be bonded integrally with the film layer, or with a substrate which is fixedly provided on the film layer (a substrate with a tab). When the substrate with the tab is used, it is bonded to the film layer so that it is not delaminated from the film layer in the
  • the substrate with the tab is preferably provided
  • the substrate and the film layer are bonded preferably with the bonding adhesive layer having a larger peel strength than that of the repeelable
  • the optical filter (6) shown in the figures comprises the film layer (60) having the surface (601), which is observed by an observer, and the back surface (602) opposing to
  • the substrate (1) with the tab and the repeelable adhesive layer (2) are assembled in the optical filter (6) with bonding the
  • the optical filter (6) is fixed to the surface (the display screen (70)) of the display panel (79) of the display (7) through the repeelable adhesive layer (2) of the double-sided tape (100) with the tab.
  • the display (7) of Fig. 1 has the frame (71) surrounding the display screen (70).
  • Examples of the display having such a structure include a monitor of a notebook PC, a portable terminal such as PDA, etc.
  • the optical film such as the antireflection film, the louver film, etc.
  • the details of the film layer and the optical film will be explained below.
  • substrates (1) with the tab are partly provided on the back surface of the film layer near
  • the tab (10) extends outwardly from the outer periphery of the film layer (60). That is, when the optical filter is fixed to the adherent surface, the tab (10) extends outwardly from the covered region of the adherent surface (the display screen (70)), which is covered with the film layer (60)
  • the optical filter (60) can be peeled from the adherent surface
  • the peeling force is effectively applied to the optical filter, and the optical filter can be detached from the adherent surface together with the substrate (1) with the tab adhered to the optical filter.
  • the optical filter can be detached
  • the substrate (1) with the tab is usually made of a transparent material.
  • transparency of the substrate is at least 80 %, preferably at least 85 %, particularly preferably at least 90 %, in terms of a light transmittance.
  • the "light transmittance” means a total light transmittance, which is measured with a spectrophotometer or a color meter having a spectrometric function using
  • the substrate is usually formed of a polymer sheet, since it should be flexible.
  • polyesters e.g. PET, polyethylene naphthalate (PEN), etc.
  • acrylic polymers e.g. acrylic polymers, vinyl chloride polymers, polyurethane, and the like may be used.
  • the bonding adhesive layer and the repeelable adhesive sheet are both
  • the screen can be clearly seen if the film layer (60) and the substrate (1) with the tab cover the display screen with overlapping as shown in
  • a part of the tab which does not overlap with the film layer (60) may not be transparent, and may be made opaque with coloring. When the tab is colored, it is
  • the tab is made less conspicuous, and the appearance of the surrounding of the display screen are not deteriorated when the optical filter is fixed to the screen.
  • the substrate (1) with the tab is bonded to the film layer (60) through the bonding adhesive layer (3) so that the tab is not detached from the film
  • the bonding adhesive layer has a larger peel strength than that of the repeelable adhesive layer to effectively prevent the peeling of the bonding adhesive layer from the substrate (1) of the film layer.
  • the repeelable adhesive layer (2) is provided so that it is opposed to the bonding adhesive layer (3) with
  • substrate (1) with the tab is provided between the film layer and the repeelable adhesive layer.
  • the substrate with the tab may be provided at any place of the film layer insofar as it is not detached from the film layer during the peeling work.
  • the substrate with the tab may be fixed to the surface of the film layer. In this case, the repeelable
  • adhesive layers are partly provided on the back surface (602) of the film layer near the
  • the optical filter is adhered partially to the display screen, and the gap (G) is formed between the optical filter (6) and the display screen (70).
  • the repeelable adhesive layer may be provided on the whole back surface of the film layer insofar as the optical filter can be easily detached. In this case, the number of
  • the tabs may be less than or more than four. From the viewpoint of the easy detachment of the optical filter, the number of the tabs should be at least two so that a peeling operator (i.e. a user) can detach the optical filter with both hands.
  • the optical filter (6) having two tabs (10a, 10b) is
  • Fig. 6 may be formed by bonding the film layer (60) to the surface (11) of the substrate
  • the substrate with the tabs shown may be made by cutting a polymer film in the shape (having two tabs protruding from the periphery) shown in the figure, or by supplying a polymer film having the same size as the film layer and bonding two pieces of
  • the size and shape of the tab are preferably selected so that the optical filter can be easily peeled and the tab is not broken during the peeling work.
  • the thickness of the tab is usually from 50 to 300 ⁇ m.
  • the length of the tab in the extending direction (the length of the tab beyond the edge of the film layer) is usually from 3 to 30 mm, preferably from 5 to 20 mm.
  • the length of the tab across the extending direction may be the same as or less than the peripheral edge of the film layer to
  • the tab which the tab is bonded, and is usually at least 3 mm, preferably at least 5 mm, particularly preferably at least 10 mm.
  • the shape of the tab may be arbitrarily selected, as shown in the figures. Preferably, it can be a geometric shape such as a triangle, a rectangle, a circle, a fan, an
  • ellipsoid an ellipsoidal fan, etc., a shape imitating a good (a flower shape, a star, a handprint, a footprint, etc.), since the optical filter will have a well-designed appearance
  • the number of the tabs is 4 or less since the appearance of the surrounding of the display screen is not deteriorated, when the optical filter is fixed to the
  • the display screen (70) is
  • the thickness of the whole optical filter (6) (the thickness including the double-coated tape with the tab) is less than the height of the step.
  • the optical filter (6) is
  • the frame (71) has the inclined plane (712) which connects the inner periphery (710) and the upper face (711).
  • the tab (10) passes through the gap between the inner periphery (710) and the optical filter (6) and
  • the tab (10) is provided at a certain height from the upper face (711) and floats over the frame. When the thickness of the tab is relatively large or the
  • this gas is made as small as possible.
  • the tab is folded so that the shape of the tab closely follows the surface contour of the frame.
  • a repeelable adhesive layer may be provided also on the back surface of the tab (10), and the tab (10) is repeelably adhered to the upper face (711) of the frame.
  • an adhesive strip comprising a single-coated repeelable adhesive tape is used and the tab (10) is repeelably adhered to the frame.
  • the tabs (10a, 10b) are positioned over the screen
  • the two corners of the film layer (60) are cut away in a triangle form having a specific area, and the substrate with the tabs is provided
  • the length of the extended part of each tab is made as short as possible so that the tab is in touch with the inclined plane (712) of the frame but does not extend over the upper face (711)
  • Fig. 9 shows an embodiment in which the optical
  • filter (6) is fixed to the display (7) having no step of the frame around the display screen.
  • Examples of the display having such a structure include a display of a portable phone, a flat face liquid crystal monitor (the display screen and the frame surface being on the same plane), etc.
  • the optical filter (6) of Fig. 9 comprises the film layer (60) having the same form
  • the tabs (10a, 10b) are provided continuously along the two opposing sides of the film layer (60), respectively. That is, the shape of the whole optical filter (6) is a rectangle. With such shape, the appearance of the display
  • the film layer (60) may be produced by cutting an
  • optical film such as an antireflection film, a louver film, etc. so that it has the specific shape and size of the screen.
  • the tabs may be colored with a desirable color, or provided with visual information such as designs, symbols, characters, etc. Such visual information
  • the optical filter (6) shown in the figure may be formed by supplying a flexible
  • Double-coated adhesive tape having two tabs (10a, 10b) may be used. Double-coated tape with tab
  • the double-coated tape with the tab is assembled in the optical filter in use as
  • the double-coated tape with the tab comprises the substrate (1) with the flexible tab, the bonding adhesive layer (3) which is adhered to the surface of the substrate (1) and allows the substrate to be adhered to the back surface of the film layer, and the repeelable adhesive layer (2) which is adhered to the substrate (1) with the flexible tab, the bonding adhesive layer (3) which is adhered to the surface of the substrate (1) and allows the substrate to be adhered to the back surface of the film layer, and the repeelable adhesive layer (2) which
  • the double-coated tape (100) with the tab has the tab (10) which extends outwardly from the outer periphery of the film layer, when the tape is adhered to the film layer.
  • the tab (10) is the part of the adhesive tape, which is adhered to neither
  • the film layer nor the display screen That is, the bonding adhesive layer (3) and the
  • repeelable adhesive layer (2) are fixedly provided only on the part of the surface and the back surface of the substrate (1), respectively, with the two adhesive layers being opposed each other through the substrate (1).
  • the double-coated tape with the tab may have the structure as shown in Fig. 4.
  • the bonding adhesive layer (3) is adhered to only the part of the surface of the substrate (1), that is, the part which is adhered to the film layer, while no bonding adhesive layer (3) is provided on the tab (10).
  • repeelable adhesive layer (2) which is provided on part corresponding to the tab (10), is covered with the covering film (4).
  • the surface region of the tab (10) having no adhesive layer is non-adhesive, while the back surface region of the tab (10)
  • the covering film (4) makes the back surface of the tab (1) non-adhesive.
  • the covering film (4) is made of a material and has a thickness, which do not deteriorate the flexibility of the tab as a whole.
  • the covering film (4) is formed of a polymer film having no adhesion properties at room temperature (about 25°C), a paper sheet, a metal foil, etc. Examples of the polymer of the polymer film
  • polyester acrylic polymers, polyvinylidene fluoride, polyurethane, epoxy resins,
  • the thickness of the covering film (4) is usually from 1 to 200 ⁇ m, preferably from 2 to 100 ⁇ m although it depends on the thickness of the substrate.
  • the covering film (4) may be used without or with being peeled off from the
  • the tab (10) may be repeelably adhered to the surface of the part (e.g. the frame, etc.) surrounding the display screen through the repeelable adhesive layer (2).
  • adhered to the repeelable adhesive layer (2) is preferably subjected to an adhesion- enhancing treatment such as corona treatment, primer treatment, etc.
  • the tab (10) may be colored.
  • Fig. 4 may be formed of a colored film in the embodiment of Fig. 4.
  • the repeelable adhesive layer (2) are the same as those of the part surrounding the display screen.
  • the color and appearance of the back surface side of the colored film are preferably different from those of the surface side.
  • the double-coated tape with the tab may have the structure as shown in Fig. 5.
  • the repeelable adhesive layer (2) is provided on
  • the covering film (4) may be the same as that shown in Fig. 4, and is made of a material and has a thickness, which do not
  • the covering film (4) preferably comprises the colored film from the viewpoint of the easiness of the adhesion work.
  • the tab can be repeelably adhered to the surface of the part surrounding the display screen through the repeelable adhesive layer (2),
  • the second covering film is provided on the part of the repeelable adhesive layer (2) corresponding to the tab, so that the surface and back surface of the tab (10) are both non-tacky.
  • the double-coated tape with the tab may be produced with the application of the production method of conventional double-coated adhesive tapes.
  • the double-coated tape (100) with the tab shown in Fig. 5 may be produced as follows:
  • the raw tape (109) shown in Fig. 10 is supplied. That is, the first adhesive layer, which serves as the bonding adhesive layer, is fixedly provided on the surface of a transparent raw substrate (not shown), and the second adhesive layer, which serves as the first adhesive layer, which serves as the bonding adhesive layer.
  • repeelable adhesive layer is fixedly provided on the back surface of the raw substrate to form the precursor of the raw tape (109), and then, the raw covering film (49) is provided on the surface of the first adhesive layer to obtain the raw tape (109).
  • the remaining adhesive surface of the first adhesive layer which is
  • the double-coated tape (100) with the tab can be prepared by cutting the raw tape (109) obtained in the above in the desired shape and size. The position, size and shape to
  • the raw tape (109) is cut along the cut line (8), that is, in the direction perpendicular to the lengthwise direction of the raw tape (109) to obtain the double-coated tape (100)
  • the tab part is trimmed to obtain the double-coated tape (100) with the tab having the desired shape as shown in Fig. 11.
  • the shape of the tab may be the
  • the adhesive layer (the bonding adhesive layer or the repeelable adhesive layer) may be formed of a coated film of a coating composition containing an adhesive component.
  • a coated film may be formed by applying the composition directly on the substrate, or by transferring the coated film, which has been formed on a process
  • a masking tape may be used when the coating composition is
  • the adhesive layer is partly formed on one or both of
  • a masking tape may be used. That is, the masking tape is adhered to the part of the substrate and then the coated film is formed. Thereafter, the masking tape is removed to form the part having no adhesive
  • At least a part of the substrate, which is laminated with the film layer, is transparent.
  • the transparency of the film is usually at least 80 %, preferably at least 85 %, particularly preferably at least 90 %, in terms of a light transmittance.
  • the substrate is usually formed of a polymer sheet. Examples of the polymer include polyesters (e.g. PET,
  • the size and shape of the substrate are preferably selected so that the peeling work is easy and the tape is not broken in the peeling work.
  • the thickness of the substrate is usually from 20 to 300 ⁇ m, preferably from 30 to 200 ⁇ m.
  • the thickness of the tab as a whole is usually from 50 to 300 ⁇ m.
  • the length of the tab in the extending direction is usually from 5 to 30 mm, preferably from 10 to 20 mm.
  • the width of the tab (in the direction perpendicular to the extending direction) may be the same as or less than the side of the film layer to which the double-coated tape with the tab is bonded, and is usually at least 5 mm, preferably at least 10 mm.
  • the shape of the tab is
  • the bonding adhesive layer preferably has as much high transparency as possible.
  • the light transmittance is at least 80 %, preferably at least 85 %, particularly preferably at
  • the bonding adhesive layer may be formed of a conventional adhesive such as a pressure-sensitive adhesive, a heat-sensitive adhesive, a curable adhesive, etc.
  • the adhesive comprises a self-adherent polymer, which is preferably crosslinked.
  • adherent polymer means a polymer which exhibits tackiness at room temperature (about
  • the self-adherent polymer of the bonding adhesive layer may be, for example, an acrylic polymer, a nitrile-butadiene copolymer (e.g. NBR, etc.), a styrene-butadiene copolymer (e.g. SBR, etc.), an amorphous polyurethane, a silicone polymer, etc.
  • adherent polymer may comprises one or more of these polymers.
  • the self-adherent polymer may be prepared by polymerizing a monomer mixture containing a specific starting monomer or monomer(s).
  • the polymerization method may be a conventional one such as solution polymerization, bulk polymerization, emulsion polymerization, etc.
  • the thickness of the bonding adhesive layer is usually from 5 to 50 ⁇ m.
  • the difference (F-R) of the peel strength (F) of the bonding adhesive layer and the peel strength (R) of the repeelable adhesive layer is preferably at least 3 N/25 mm, more preferably at least 5 N/25 mm, when the both peel strengths are measured against a PET surface at a peeling rate of 90 inch/min. at a peeling angle of 90 degrees.
  • the substrate may be peeled from the peel strengths (F-R)
  • the peel strength (F) of the bonding adhesive layer is not limited but is usually from 4 to 50 N/25 mm.
  • the thickness of the bonding adhesive layer is usually from 10 to
  • the repeelable adhesive layer has an adhesion force (peel strength) in the specific range so that the optical filter can be removed without damaging the adherent surface.
  • the repeelable adhesive layer has a peel strength of 0.1 to 4.5 N/25 mm, when
  • the peel strength is measured against a PET surface at a peeling rate of 90 inch/min. at a
  • the peeling angle of 90 degrees As described above.
  • the optical filter may be detached from the adherent surface while in use.
  • the peel strength against PET is large, the detaching of the optical filter is easy even when
  • the peel strength against PET of the adhesive layer is preferably from 0.5 to 4.0 N/25 mm, particularly preferably from 1 to 3.6 N/25 mm.
  • the repeelable adhesive layer preferably contains a self-adherent polymer and a repeelability-imparting component.
  • the peel strength of the repeelable adhesive preferably contains a self-adherent polymer and a repeelability-imparting component.
  • a crosslinking agent is preferably used as a repeelability-imparting
  • a crystalline polymer is preferably used as a repeelability-imparting component to decrease the tack of
  • the kind and amount of the repeelability- imparting component are suitable selected so that the desired effects are attained and the transparency of the repeelable adhesive layer is not deteriorated.
  • the self-adherent polymer used in the repeelable adhesive used in the repeelable adhesive
  • the layer is also a polymer which is tacky at room temperature (about 25°C).
  • the self-adherent polymer are acrylic polymers, nitrile-butadiene copolymers (e.g. NBR, etc.), styrene-butadiene copolymers (e.g. SBR, etc.), amorphous polyurethane, silicone polymers, etc. These polymers may be used independently or as a mixture of two or more.
  • the self-adherent polymer may be obtained by polymerizing a monomer mixture
  • the polymerization method is solution polymerization, bulk polymerization, emulsion polymerization, etc.
  • crosslinking agent a polyfunctional isocyanate compound, an epoxy resin, a bisamide crosslinking agent, etc. may be used. These compounds react with the carboxyl group of the self-adherent polymer or the crosslinkable functional group which is optionally contained such as a hydroxyl group to crosslink the self-adherent polymer so
  • the content of the crosslinking agent is preferably from 1 to 5 wt. parts, more preferably from 1.5 to 4 wt. parts, based on 100 wt. parts of the self-adherent
  • the repeelable adhesive layer may contain a rubbery polymer.
  • the rubbery polymer may be at least one polymer selected from the group consisting of silicone rubber, fluororubber, acrylic rubber, ethylene-propylene rubber and acrylonitrile rubber. Also the elastomeric polymer is preferably crosslinked. Thereby, the peel strength can be adjusted
  • the elastic modulus of the rubbery polymer is selected so that the peel strength is in the above-described range.
  • the elastic modulus G storage modulus
  • the elastic modulus G is usually from 20 to 300 kPa, preferably from 30 to 200 kPa, more preferably from 50 to 100 kPa, when it is measured by a dynamic viscoelasticity measuring method
  • the repeeling property may deteriorate.
  • the modulus G is too large, the adhesion of the optical filter to the adherent surface may deteriorate.
  • the repeelable adhesive layer also has as high transparency as possible.
  • the light transmittance is usually at least 80 %, preferably at least 85 %, particularly preferably at least 90 %.
  • the thickness of the repeelable adhesive layer is usually from 10
  • the film layer included in the optical filter according to the present invention is the film layer included in the optical filter according to the present invention.
  • the optical film is a film which can impart any optical
  • optical function means a function to control at least one property selected from the group consisting of a light transmittance, light reflectance, a refractive index and light-transmitting direction.
  • the optical film may be a louver film consisting of or comprising a
  • the louver layer is a film having minute louvers (or louver-form elements) inside the film, which can control the light-transmitting direction.
  • the louver layer comprises light-transmitting parts and minute louver elements which shield light.
  • the light-transmitting part has a larger width than the width of the
  • louver element (a size of the louver element in the direction in parallel with the surface of
  • the width of the light-transmitting part is preferably from 50 to 500 ⁇ m, more preferably from 70 to 200 ⁇ m.
  • the width of the louver element is smaller than that of the light-
  • the width of the louver element is from 1 to 100 ⁇ m, preferably from 10 to 50 ⁇ m.
  • the angle of the louver element is usually from 40 to 90 degrees.
  • the angle of the louver element means an angle between the surface of the louver layer and the plane of the
  • louver element When the louver element lies at right angles with the surface of the louver
  • the angle of the louver element is 90 degrees.
  • the thickness of the louver layer can be suitably determined according to the application of the optical filter. As the thickness of the louver layer decreases, the effect to control the propagation direction of light tends to decrease. When the thickness of the louver layer is large, it is difficult to decrease the total thickness of the optical filter.
  • the thickness of the louver element is preferably from 10 to 1,000 ⁇ m, more
  • the light-transmitting parts of the louver layer are preferably made of a polymer having a high transparency.
  • a polymer having a high transparency As such a polymer, a thermoplastic resin, a thermosetting
  • resin a resin curable with an actinic ray such as UN ray, etc.
  • resins include cellulose resins such as cellulose acetate butyrate, triacetylcellulose, etc.; polyolefin resins such as polyethylene, polypropylene, etc.; polyester resins such as polyethylene terephthalate, etc.; polystyrene; polyurethane; polyvinyl chloride; acrylic
  • the louver elements may be formed from a light-shielding material which can absorb or reflect light.
  • a light-shielding material which can absorb or reflect light.
  • Examples of such a material include (1) dark pigments or dark dyes such as black or gray pigments or dyes, (2) metal such as aluminum, silver, etc., (3) dark metal oxides, and (4) the above-described polymers containing the dark pigments or dyes.
  • the louver layer may be produced by the following method, which is disclosed, for
  • a layer containing the light-shielding material is fixed to one main surface of
  • a laminate film consisting of the polymer film and the light-shielding material layer.
  • Such laminate films are prepared and laminated to form a precursor louver film in which the polymer film and the light-shielding material layers are alternately arranged and fixed each other.
  • a precursor louver film is skived at a desired thickness along
  • louver film having the louver layer a commercially available louver film may also be used.
  • a commercially available louver layer for a louver film may be used as the louver layer used as a component member of the optical filter according to the present
  • louver film is "LIGHT
  • the optical film may be an antireflection film, a Fresnel
  • the film layer may have two or more optical films, or a light transmitting film
  • the thickness of the film layer as a whole is usually from 20 to 1,000 ⁇ m.
  • Example 1 In this Example, an optical filter was produced using an optical film and a double-
  • Fig. 11 in combination. Two tabs were used, which had the same size and shape.
  • the louver film had a thickness of about 260 ⁇ m and a view angle of 90 degrees (a louver film "OAG 90" manufactured by 3M).
  • the transmitting part was 100 ⁇ m and the width of the louver-form element was 10 ⁇ m.
  • the optical film used had the rectangular surface and back surface, and its plane size was 245 mm x 185 mm.
  • the double-coated tape with the tab was produced as follows: As a transparent substrate, a PET film having a length of about 2 cm (a size in the
  • the substrate had a light transmittance of 90 %.
  • the first adhesive film in a rectangular form of 1 cm x 1.5 cm was adhered as a bonding adhesive layer.
  • the first adhesive film was adhered to the substrate with the side of the tab having the length of 1.5 cm mating with one edge of
  • the first adhesive film was made of a transparent adhesive tape (#9483 manufactured by 3M). This adhesive tape had a light transmittance of 93 %. The adhesion surface of the first adhesive film, which was not in
  • the second adhesive film in a rectangular form of 2 cm x 1.5 cm was adhered as a repeelable adhesive layer.
  • the second adhesive film was made of a transparent adhesive tape (manufactured by PANAC). It had a light
  • the liner on the repeelable adhesive layer (the second adhesive film) was kiss-cut, and the liner was peeled off to expose only the adhesive surface corresponding to the tab on which the bonding adhesive layer was not provide, and a covering film was
  • the covering film was an opaque film, which consisted of a PET film having a white coating on one surface and a black coating on the other surface, and had a thickness of about 50 ⁇ m as a whole.
  • the covering film was adhered to the repeelable adhesive layer with the white surface facing the repeelable layer.
  • the test specimen used in the measurement of the peel strength was produced as follows. The adhesive film was cut to a size of 15 cm x 25 cm to obtain a sample. This
  • the peel strength against PET of the first adhesive film was 20 N/25 mm, while
  • the optical filter of this Example was fixed to the liquid crystal display screen of a note notebook PC through the repeelable adhesive layer of the double-coated tape with the tab, as shown in Fig. 2.
  • the display having the optical filter of the present invention was
  • the double- coated tapes with the tab were adhered to the two comers of the optical filter through the bonding adhesive tapes, so that each double-coated tape was provided at the respective upper comer of the display screen. That is, the optical filter had the same structure as one
  • the optical filter was easily fixed to the display screen, and achieved the good effect to prevent peeping at the screen from the side direction. That is, when the screen
  • the tabs floated over the surface of the frame. Accordingly, when the optical filter was detached from the screen, the tabs could be easily pinched with fingers, and the optical

Abstract

L'invention concerne un filtre optique comprenant une couche de film dotée d'un film optique, une surface observée par un utilisateur, une surface arrière opposée à la première et une couche adhésive détachable fixée sur la surface arrière de la couche de film et pouvant adhérer de manière détachable à une surface d'adhérence. Ledit filtre optique est fixé à la surface d'adhérence par l'intermédiaire de la couche adhésive, et comprend une languette souple fixée sur la couche de film.
PCT/US2002/023240 2001-07-23 2002-07-03 Filtre optique WO2003010569A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2001-221312 2001-07-23
JP2001221312A JP2003043934A (ja) 2001-07-23 2001-07-23 光学フィルタ及びタブ付き両面接着テープ

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WO2003010569A3 WO2003010569A3 (fr) 2003-05-15

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WO2005024473A2 (fr) * 2003-08-29 2005-03-17 3M Innovative Properties Company Empilement avec adhesif pour films optiques multiples
US7147358B2 (en) 2003-12-31 2006-12-12 3M Innovative Properties Company Cover removal tab for optical products
US7236217B2 (en) 2003-01-16 2007-06-26 3M Innovative Properties Company Package of optical films with zero-gap bond outside viewing area
US7339635B2 (en) 2005-01-14 2008-03-04 3M Innovative Properties Company Pre-stacked optical films with adhesive layer
US7777832B2 (en) 2005-11-18 2010-08-17 3M Innovative Properties Company Multi-function enhancement film
WO2011004139A2 (fr) 2009-07-06 2011-01-13 Staffordshire University Appareil et procédés améliorés pour examiner par voie optique des échantillons biréfringents
US8264528B2 (en) 2004-12-14 2012-09-11 Fujitsu Ten Limited Display apparatus, frame member, and reflection suppressing member
CN102676071A (zh) * 2011-03-08 2012-09-19 东莞市纳利光学材料有限公司 一种自动吸附、超薄、防窥、防刮花保护膜的制备方法
US8513528B2 (en) 2009-10-07 2013-08-20 Fujitsu Limited Cable interconnection structure and electronic apparatus
US8717511B2 (en) 2009-10-07 2014-05-06 Fujitsu Limited Electronic apparatus
CN105051818A (zh) * 2013-11-15 2015-11-11 Ｍｓｐ株式会社 贴附于剥离纸的记录装置用堵孔密封件
US20170227809A1 (en) * 2014-10-31 2017-08-10 Panasonic Liquid Crystal Display Co., Ltd. Display device
CN110408342A (zh) * 2019-06-10 2019-11-05 江西蓝海芯科技集团有限公司 一种碳纳米球填充的双固化导电胶带的制备方法及其在电磁屏蔽胶带中的应用
WO2022256509A1 (fr) * 2021-06-03 2022-12-08 Eyesafe Inc. Couvercles d'écran d'affichage
US11592701B2 (en) 2018-11-28 2023-02-28 Eyesafe Inc. Backlight unit with emission modification
US11686968B2 (en) 2014-05-23 2023-06-27 Eyesafe Inc. Light emission reducing compounds for electronic devices
US11810532B2 (en) 2018-11-28 2023-11-07 Eyesafe Inc. Systems for monitoring and regulating harmful blue light exposure from digital devices

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JP2006171747A (ja) * 2005-12-12 2006-06-29 Fujitsu Ten Ltd マルチビュー表示装置および抑止手段
JP4645533B2 (ja) * 2006-06-05 2011-03-09 パナソニック株式会社 電子機器へのキーボードの保持装置
JP4855204B2 (ja) * 2006-10-13 2012-01-18 大成建設株式会社 電磁シールド壁の貫通部の閉塞方法
JP2011081213A (ja) * 2009-10-07 2011-04-21 Fujitsu Ltd 画像表示パネル、電子機器、および画像表示パネルの分解方法
CN102551786B (zh) * 2010-12-22 2016-08-03 Ge医疗系统环球技术有限公司 使用可揭除双面胶膜固定平板探测器的方法
JP5715857B2 (ja) * 2011-03-16 2015-05-13 大王製紙株式会社 粘着シートの剥離方法
JP5897392B2 (ja) * 2012-04-25 2016-03-30 大王製紙株式会社 粘着シート及び剥離方法
TWI468782B (zh) * 2012-08-28 2015-01-11 Young Lighting Technology Inc 電子裝置
JP2016117108A (ja) * 2014-12-18 2016-06-30 東洋ゴム工業株式会社 研磨パッド
WO2016103372A1 (fr) * 2014-12-24 2016-06-30 リンテック株式会社 Feuille adhésive double face destinée à des panneaux de protection, et un panneau de protection de surface
JP6922181B2 (ja) * 2016-10-07 2021-08-18 大日本印刷株式会社 視野角制御部材、表示装置
JP6554190B2 (ja) 2017-05-25 2019-07-31 レノボ・シンガポール・プライベート・リミテッド 視野角変更フィルム及び電子機器
CN108932011B (zh) * 2017-05-25 2021-07-13 联想（新加坡）私人有限公司 视场角改变膜以及电子设备
KR102540104B1 (ko) * 2022-05-26 2023-06-05 주식회사 내산 툴마킹이 제거된 광학용 양면테이프의 이형필름 교체 방법

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US7236217B2 (en) 2003-01-16 2007-06-26 3M Innovative Properties Company Package of optical films with zero-gap bond outside viewing area
WO2005024473A2 (fr) * 2003-08-29 2005-03-17 3M Innovative Properties Company Empilement avec adhesif pour films optiques multiples
WO2005024473A3 (fr) * 2003-08-29 2005-06-16 3M Innovative Properties Co Empilement avec adhesif pour films optiques multiples
CN100407006C (zh) * 2003-08-29 2008-07-30 3M创新有限公司 多个光学薄膜的粘合叠层及其制造方法
US7413336B2 (en) 2003-08-29 2008-08-19 3M Innovative Properties Company Adhesive stacking for multiple optical films
US7147358B2 (en) 2003-12-31 2006-12-12 3M Innovative Properties Company Cover removal tab for optical products
US8264528B2 (en) 2004-12-14 2012-09-11 Fujitsu Ten Limited Display apparatus, frame member, and reflection suppressing member
US7339635B2 (en) 2005-01-14 2008-03-04 3M Innovative Properties Company Pre-stacked optical films with adhesive layer
US7777832B2 (en) 2005-11-18 2010-08-17 3M Innovative Properties Company Multi-function enhancement film
WO2011004139A2 (fr) 2009-07-06 2011-01-13 Staffordshire University Appareil et procédés améliorés pour examiner par voie optique des échantillons biréfringents
US8961727B2 (en) 2009-07-06 2015-02-24 Staffordshire University Apparatus and methods for the optical examination of birefringent specimens
US8717511B2 (en) 2009-10-07 2014-05-06 Fujitsu Limited Electronic apparatus
US8513528B2 (en) 2009-10-07 2013-08-20 Fujitsu Limited Cable interconnection structure and electronic apparatus
CN102676071B (zh) * 2011-03-08 2014-07-16 东莞市纳利光学材料有限公司 一种自动吸附、超薄、防窥、防刮花保护膜的制备方法
CN102676071A (zh) * 2011-03-08 2012-09-19 东莞市纳利光学材料有限公司 一种自动吸附、超薄、防窥、防刮花保护膜的制备方法
CN105051818A (zh) * 2013-11-15 2015-11-11 Ｍｓｐ株式会社 贴附于剥离纸的记录装置用堵孔密封件
CN105051818B (zh) * 2013-11-15 2018-10-09 Ｍｓｐ株式会社 贴附于剥离纸的记录装置用堵孔密封件
US11947209B2 (en) 2014-05-23 2024-04-02 Eyesafe Inc. Light emission reducing compounds for electronic devices
US11686968B2 (en) 2014-05-23 2023-06-27 Eyesafe Inc. Light emission reducing compounds for electronic devices
US20170227809A1 (en) * 2014-10-31 2017-08-10 Panasonic Liquid Crystal Display Co., Ltd. Display device
US11592701B2 (en) 2018-11-28 2023-02-28 Eyesafe Inc. Backlight unit with emission modification
US11810532B2 (en) 2018-11-28 2023-11-07 Eyesafe Inc. Systems for monitoring and regulating harmful blue light exposure from digital devices
CN110408342B (zh) * 2019-06-10 2020-12-08 江西蓝海芯科技集团有限公司 一种碳纳米球填充的双固化导电胶带的制备方法及其在电磁屏蔽胶带中的应用
CN110408342A (zh) * 2019-06-10 2019-11-05 江西蓝海芯科技集团有限公司 一种碳纳米球填充的双固化导电胶带的制备方法及其在电磁屏蔽胶带中的应用
WO2022256509A1 (fr) * 2021-06-03 2022-12-08 Eyesafe Inc. Couvercles d'écran d'affichage

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