CN212312931U

CN212312931U - Decorative film, window film provided with same, and window laminate

Info

Publication number: CN212312931U
Application number: CN202020406735.5U
Authority: CN
Inventors: 金德谦; 李京模; 李泰炯
Original assignee: Dongwoo Fine Chem Co Ltd
Current assignee: Dongwoo Fine Chem Co Ltd
Priority date: 2019-03-29
Filing date: 2020-03-26
Publication date: 2021-01-08
Anticipated expiration: 2030-03-26
Also published as: KR20200115091A

Abstract

The utility model relates to a decorative film, possess its window membrane and window lamination. A decorative film, comprising: a protective layer composed of an organic film; and a black matrix formed by patterning the front surface of the protective layer, and including a single organic film, wherein a tapered portion of a single step portion is formed at a boundary between the black matrix and the display region.

Description

Decorative film, window film provided with same, and window laminate

Technical Field

The present invention relates to a decorative film, and more particularly, to a decorative film having a black matrix, a window film and a window laminate having the same, and a method for manufacturing the same.

Background

The decorative film exhibits a decorative function while blocking light, and is widely used in devices or materials that can include the decorative film, for example, windows (ultra-thin glass windows, film windows, and the like) used in flexible displays, interlayer insertion films (impact absorbing layers, anti-scattering layers, and the like), touch sensors, polarization layers, and the like.

Looking at an example of using the decoration film in the touch sensor, the touch sensor may be configured of a sensing unit, and divided into a display Area (View Area) at the center where light is transmitted and a Bezel Area (Bezel Area) where a wiring portion is disposed and an edge of light is blocked, and the decoration film may be attached to the Bezel Area. The decoration film may include a Black Matrix (Black Matrix) blocking light.

As a conventional technique used in a touch sensor, there is korean patent laid-open publication No. 2018-0107347 (decorative film integrated touch sensor and a method for manufacturing the same), which has a silver nanofiber layer covering a lower surface of a decorative film portion, and a transparent electrode of the touch sensor is formed on the silver nanofiber layer. With this structure, korean patent laid-open publication No. 2018-0107347 enables removal of the UV paste layer for removing the black matrix step portion.

However, the conventional decorative film applied to the touch sensor still has a problem that the decorative film is thick and light leaks from the boundary between the display region and the black matrix region due to the thick film properties of the step portion of the black matrix and the silver nanofiber layer.

SUMMERY OF THE UTILITY MODEL

Technical problem

The present invention is proposed in order to solve the problems of the prior art, and provides a decorative film as follows:

first, the thickness of the decoration film can be further reduced by minimizing the thickness of the black matrix.

Second, a phenomenon that light leaks from a boundary between the display portion region and the black matrix can be minimized.

Technical scheme

The decorative film of the present invention for achieving such an object may be constituted by including a protective layer, a black matrix, and the like.

The protective layer may be composed of an organic film.

The black matrix may be formed by patterning on the front surface of the protective layer. The black matrix may be formed of a single layer of an organic film, and may have a tapered portion of a single step portion at a boundary between the black matrix and the display portion region.

The decorative film of the present invention may further include a separation layer. The separation layer may be bonded to a lower portion of the protective layer and composed of an organic film.

The decoration film of the present invention may include a planarization layer formed on the front surface of the protective layer and the black matrix and composed of a transparent organic film.

In the decoration film of the present invention, the planarization layer is constituted by an outer coating layer, and may have a thickness of 1 μm to 2.5 μm.

The utility model discloses a decorative film can include the bond line, and the bond line forms in the front of protective layer and black matrix, and the thickness of bond line is 1 mu m to 50 mu m.

In the decoration film of the present invention, the black matrix may be formed with a slope surface within a width range of 0.5 μm to 2 μm from the display portion region.

In the decoration film of the present invention, the black matrix may have a uniform thickness in the region behind the slope.

In the decoration film of the present invention, the black matrix may have a thickness of 1.2 μm to 2.0 μm and an optical density of 5 or more in the region behind the slope.

The window film of the present invention may include the decorative film described above, a bonding layer bonded to the back of the separation layer of the decorative film, and a functional layer bonded to the bonding layer.

In the window film of the present invention, the functional layer may be a transparent film, a polarizing plate, a touch sensor layer, a moisture-proof film, or an ultra-thin glass. Here, the ultra-thin type glass may have a thickness of 25 μm to 50 μm.

In the window film of the present invention, the transparent film may be at least one selected from the group consisting of polyvinyl ether phthalate (polyethyleneterephthalate), Polyethylene naphthalate (polyethyleneaphthalate), polycarbonate (polycarbonate), polyarylate (polyarylate), polyetherimide (polyethyleneimide), polyethersulfonate (polyethylenesulfonate), polyimide (polyethyleneimide), polyetheretherketone (polyethyleneketone), Polyethylene Terephthalate (polyethyleneterephthalate), Triacetyl Cellulose (Triacetyl Cellulose), Cyclo-olefin Polymer (Cyclo-olefin Polymer), aramid (aramid), Fiber Reinforced Plastic (FRP), polyurethane (polyethyleneurethane), polyacrylate (polyacrylate), and polydimethylsiloxane (polydimethysiloxane).

In the window film of the present invention, the transparent film may be made of a laminate of Polyethylene Terephthalate (Polyethylene Terephthalate), colorless polyimide (polyimide), Polyethylene Terephthalate (Polyethylene Terephthalate) and colorless polyimide (polyimide), or colorless polyimide (polyimide) containing a hard coat layer.

The window laminate of the present invention may include the window film described above and a touch sensor or antenna laminated on the window film.

The manufacturing method of the decorative film of the utility model can comprise the following steps: forming a separation layer composed of an organic film on the front surface of the carrier substrate; forming a protective layer made of an organic film on the front surface of the separation layer; coating a photosensitive black resin composition on the front surface of the protective layer; forming a black matrix having a single layer and a single step portion by exposing and developing the photosensitive black resin composition; post-baking the black matrix; and forming a decoration film by separating the separation layer and the carrier substrate from the protective layer.

The other manufacturing method of the decorative film of the present invention may include the following steps: forming a separation layer composed of an organic film on the front surface of the carrier substrate; forming a protective layer made of an organic film on the front surface of the separation layer; coating a photosensitive black resin composition on the front surface of the protective layer; forming a black matrix having a single layer and a single step portion by exposing and developing the photosensitive black resin composition; post-baking the black matrix; and forming a decoration film by separating the carrier substrate from the separation layer.

The manufacturing method of the decorative film of the utility model can comprise the following steps: an overcoat planarization layer made of a transparent organic film is formed on the front surfaces of the protective layer and the black matrix.

In the method of manufacturing a decorative film according to the present invention, the planarization layer may be formed by a photolithography process.

The manufacturing method of the decorative film of the utility model can comprise the following steps: and forming an adhesive layer on the front surfaces of the protective layer and the black matrix.

In the method for manufacturing a decorative film according to the present invention, the Post-baking (Post baker) step may be performed for 10 to 30 minutes at 190 to 250 ℃.

Advantageous effects

According to the decoration film of the present invention having such a structure, the black matrix is formed to have a single layer or a single step portion by the photolithography process, so that the thickness of the black matrix can be minimized to 2.0 μm or less, and thus the thickness of the planarization layer laminated on the upper portion of the black matrix can be reduced, and as a result, the overall thickness of the decoration film can be greatly reduced.

Further, according to the decorative film of the present invention, the black matrix has an optical density of 5 or more from a position spaced apart from the display portion region by at least 2 μm, so that a phenomenon that light leaks from a boundary between the display portion region and the black matrix region can be minimized.

Drawings

Fig. 1 is a sectional view of a decorative film according to a first embodiment of the present invention.

Fig. 2 is an enlarged photograph showing a black matrix shape of the decorative film according to the first embodiment of the present invention.

Fig. 3 is a sectional view of a decorative film according to a second embodiment of the present invention.

Fig. 4 is a manufacturing process diagram of the decoration film according to the present invention.

[ description of reference numerals ]

110: protective layer 120: black matrix

130: the planarization layer 140: separating layer

200: glass substrate 300: lithographic mask

400: bonding layer 510: hardcoat colorless PI films

520: PET film S: slope surface

T: taper width H: the taper is at its highest thickness.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings.

As shown in fig. 1, the decoration film of the first embodiment may include a protection layer 110, a black matrix 120, a planarization layer 130, and the like.

The protective layer 110 can prevent contamination of the black matrix 120, and damage of the black matrix 120 can be prevented when the separation layer 140 and the carrier substrate 200 are separated from the protective layer 110 in the manufacturing process.

The protective layer 110 may be formed of an organic film including a polymer having at least one of a hydroxyl group, a carboxyl group, and an amide group.

The black matrix 120 can function as a light blocking layer that is formed by patterning the front surface of the protective layer 110 to block light. The black matrix 120 may be located in a non-display portion region of the display device, i.e., a frame region surrounding the display portion.

The black matrix 120 may be formed of a single layer of a thin film. The black matrix 120 may have a taper of a single step.

The black matrix 120 may be composed of a black resin composition. The black resin composition may be a composition containing a resin in which black pigment particles are dispersed, a binder resin, a polymerizable compound, a polymerizable initiator, an additive, or the like, or a photo-curable (thermosetting) resin composition containing a black pigment and exhibiting a black color. The black matrix 120 may use a composition capable of selective patterning, the composition having an optical density of 3.8 or more per 1 μm.

The black pigment may be carbon black, graphite, metal oxide, or the like. The black pigment may comprise an organic black pigment, and the organic black pigment may be aniline black, lactam black, perylene black series, or the like.

The additive may contain a sticking assistant, a photocrosslinking sensitizer, a hardening accelerator, a surfactant, a dispersant, an antioxidant, an ultraviolet absorber, a thermal polymerization inhibitor, a leveling agent, and the like, and may contain one or more of them.

The black matrix 120 may be formed by a Photolithography process (Photolithography) for a thin film structure, and the Photolithography process may form the black matrix 120 by exposing and developing the photosensitive black resin composition after applying the photosensitive black resin composition to the protective layer 110. As the exposure light source, a mercury vapor arc, a carbon arc, a Xe arc, or the like, which emits light having a wavelength of 250nm to 450nm, can be used.

The planarization layer 130 may be formed on the front surfaces of the protective layer 110 and the black matrix 120, and may perform functions of surface step correction, planarization, refractive index control, a protective layer, and the like of the black matrix 120.

The planarization layer 130 may be formed of an organic film, or may be formed of an inorganic film or an organic-inorganic hybrid film. As the organic film, polyacrylate, polyimide, polyester, or the like can be used. As the inorganic film, silazane, silicon dioxide, an inorganic film which ensures light transmittance, a metal film, or the like can be used. The inorganic film may comprise an inorganic filler. The inorganic filler may be spherical nanoparticles capable of improving light extraction efficiency. The organic-inorganic hybrid film may be an organic-inorganic hybrid composite in which siloxane, silsesquioxane, or the like is dispersed.

The planarization layer 130 may be composed of an overcoat (over coating) layer, in which case the planarization layer 130 may be composed to a thickness of 1 μm to 2.5 μm.

In fig. 1, an adhesive layer or a bonding layer may be used instead of the overcoat planarization layer 130, in which case a Pressure Sensitive Adhesive (PSA) composition or an Optically Clear Adhesive (OCA) composition may be used to form the adhesive layer. For example, the adhesive layer may be formed from an adhesive composition including an acrylic copolymer and a crosslinking agent, or may be formed from an adhesive composition including a urethane (meth) acrylate resin, (meth) acrylate monomer, and a photoinitiator. The adhesive layer may be configured to have a thickness of 1 μm to 50 μm.

As shown in fig. 2, the black matrix 120 may be formed as a single layer of a thin film through a photolithography process. The black matrix 120 may be made of an organic material having an optical density of 3.8 or more per 1 μm thickness, for example, a photosensitive black resin composition. The black matrix 120 is preferably configured to have an optical density of 5.0 or more, and for this purpose, the thickness H is configured to be 1.0 μm to 2.0 μm, and preferably 1.2 μm to 2.0 μm.

The black matrix 120 may have a taper of a single step. The taper may have a ramp S. The slope S may be formed in a photolithography process. The underside of the taper may have a tail (tail) which may be formed in a post bake (post bake) process. The post-baking process may be performed at 190 ℃ to 250 ℃ for 10 minutes to 30 minutes.

The width T of the tapered portion of the black matrix 120, i.e., the width between the display region and the maximum thickness H position of the black matrix 120, may be within 2 μm. The optical density of the black matrix 120 from a position spaced 2 μm from the display region may be set to 5 or more, preferably 6 or more, and the thickness H of the black matrix 120 may be set to, for example, 1.2 μm to 2.0 μm.

It is preferable to ensure that the optical density of the black matrix 120 is 3.0 or more from a position 0.5 μm away from the display region.

The slope S may be formed in a width range of 0.5 to 2 μm from the display part region of the black matrix 120. The black matrix 120 may have a uniform thickness in a region behind the slope S.

With this structure, the black matrix 120 can minimize the leakage of light from the boundary of the display part region.

Fig. 3 is a sectional view of a decorative film of a second embodiment of the present invention.

As shown in fig. 3, the decoration film of the second embodiment may be configured to further include a separation layer 140 at a lower portion of the protective layer 110.

The separation layer 140 supports the protective layer 110 and the black matrix 120 formed on the front surface, and the separation layer 140 may be separated from the protective layer 110 or the carrier substrate 200 in the manufacturing process.

The peeling force of the separation layer 140 with respect to the carrier substrate 200 such as a glass substrate may be 5N/25mm or less, preferably 1N/25mm, and the surface energy after peeling may be 30mN/m to 70 mN/m. The separation layer 140 may have a thickness of 10nm to 1000nm, and preferably may have a thickness of 50nm to 500 nm.

The peeling force between the release layer 140 and the protective layer 110 may be, for example, 8N/25mm or more and 15N/25mm or less, and preferably 10N/25mm or more.

The separation layer 140 is formed of a polymer organic film, and the polymer organic film may include polyimide-based polymers, polyvinyl alcohol-based polymers, polyamic acid-based polymers, polyamide-based polymers, polyethylene-based polymers, polystyrene-based polymers, polynorbornene-based polymers, phenylmaleimide-based polymers, polyazobenzene-based polymers, polyphthalamide-based polymers, polyester-based aryl ester-based polymers, polymethyl methacrylate-based polymers, polyarylalate-based polymers, cinnamate-based polymers, coumarins, benzyllactam-based polymers, thiochromanones, and aromatic vinyl ketones.

First, in fig. 4 (a), a glass substrate 200 may be prepared as the decoration film of the present invention. The glass substrate 200 is a carrier substrate, and any material may be used as long as it has a suitable strength that can be fixed without being easily bent or twisted during the process, and for example, quartz, a silicon wafer, stainless steel, or the like may be used in addition to glass.

In fig. 4 (b), a separation layer 140 composed of an organic film may be formed on the front surface of the glass substrate 200.

The separation layer 140 may be formed by a slit coating method, a doctor blade coating method, a spin coating method, a casting method, a micro-gravure coating method, a bar coating method, a roll coating method, a wire bar coating method, a dip coating method, a spray coating method, a screen printing method, a gravure printing method, a flexo printing method, an offset printing method, an inkjet coating method, a dispenser printing method, a nozzle coating method, a capillary coating method, or the like.

In fig. 4 (c), the protective layer 110 may be formed on the front surface of the separation layer 140. The protective layer may be formed by coating/hardening, depositing, or the like, a composition for forming the protective layer including a polymer having at least one of a hydroxyl group, a carboxyl group, and an amide group.

In fig. 4 (d), a photosensitive black resin composition 120 may be coated on the front surface of the protective layer 110. The photosensitive black resin composition 120 may use a resin containing dispersed black pigment particles. A composition including a binder resin, a polymerizable compound, a polymerizable initiator, an additive, and the like can be used, and a composition capable of selective patterning having an optical density of 3.8 or more per 1 μm thickness can be preferably used.

The photosensitive black resin composition 120 may be formed with a thickness of 1.0 μm to 2.0 μm, and preferably may be formed with a thickness of 1.2 μm to 2.0 μm.

The photosensitive black resin composition 120 may be formed by a slit coating method, a doctor blade coating method, a spin coating method, a casting method, a micro-gravure coating method, a bar coating method, a roll coating method, a wire bar coating method, a dip coating method, a spray coating method, or the like.

In fig. 4 (e), the photosensitive black resin composition 120 can be exposed to light using a photomask 300. The exposure light may be visible light, ultraviolet light, X-ray, electron beam, or the like. A pre-heating process may be further performed before the exposure.

The black matrix can be patterned by development after exposure. For example, development can be performed by using a solution obtained by diluting an alkaline aqueous solution stock solution containing 1 to 5 wt% of a carbonate salt such as sodium carbonate, potassium carbonate, lithium carbonate by 90 to 100 times at 10 to 50 ℃ by a developer, an ultrasonic cleaner, or the like.

As shown in fig. 4 (f), the patterned photosensitive black resin composition 120 may be composed of a single layer and form a black matrix having a tapered portion of a single step portion.

In fig. 4 (f), the patterned photosensitive black resin composition 120 can be post-baked. The post-baking step can be performed at 190 ℃ to 250 ℃ for 10 minutes to 30 minutes. The tail of the taper portion can be adjusted by a heat treatment process in a photolithography process, and the shape can be adjusted in order to form other layers such as an overcoat planarization layer, a TSP wiring, an antenna wiring, etc., which are located on the upper portion of the black matrix. The post-baking can be performed by heating with a hot plate, an oven, or the like, or can be irradiated with ultraviolet rays, or a convection oven can be used.

In (g-1) of fig. 4, the

decorative films

110, 120 of the first embodiment can be formed by separating the separation layer 140 and the glass substrate 200 from the protective layer 110.

Alternatively, as shown in fig. 4 (g-2), the

decorative film

140, 110, 120 of the second embodiment including the separation layer 140 may be formed by separating the glass substrate 200 from the separation layer 140.

In FIGS. 4 (h-1) and (h-2), the functional layers 510 and 520 of the decorative film of the first embodiment can be bonded to each other with the planarization layer 130 on the front surface and the bonding layer 400 on the back surface as a medium.

The planarization layer 130 can be formed as an over coating (over coating) using an organic film of polyacrylate, polyimide, polyester, or the like, and in this case, the planarization layer 130 may be formed to have a thickness of 1.5 μm to 2.5 μm. The planarization layer 130 may also be composed of an adhesive layer or a bonding layer, and in this case, the planarization layer 130 may be configured to have a thickness of 1 μm to 50 μm.

In (h-1), (h-2) of FIG. 4, the planarization layer 130 may be formed in both the overcoat layer and the adhesion layer by a photolithography process in order to form a thin film. Of course, it is not excluded to form the planarization layer 130 by photo-hardening, thermal hardening, and both photo-hardening and thermal hardening.

In (h-1) and (h-2) of FIG. 4, a thermosetting or photo-curing adhesive such as a polyester, polyether, urethane, epoxy, silicone, or acrylic adhesive can be used as the adhesive layer 400.

The functional layers 510, 520 may include transparent films, polarizing plates, moisture-proof films, touch sensor layers, ultra-thin glass, and the like. The functional layer may be a layer composed of Polyethylene Terephthalate (Polyethylene Terephthalate), colorless polyimide (polyimide), a laminate of Polyethylene Terephthalate (Polyethylene Terephthalate) and colorless polyimide (polyimide), colorless polyimide (polyimide) containing a hard coat layer, or the like.

The transparent film may be at least one selected from the group consisting of polyvinyl ether phthalate (polyethylenephthalate), Polyethylene naphthalate (polyethyleneaphthalate), polycarbonate (polycarbonate), polyarylate (polyarylate), polyetherimide (polyethyleneimide), polyethersulfonate (polyethylenesulfonate), polyimide (polyimide), polyetheretherketone (polyethyleneketone), Polyethylene Terephthalate (polyethyleneterphthalate), Triacetyl Cellulose (Triacetyl Cellulose), cyclic olefin Polymer (Cyclo-olefin Polymer), aramid (aramid), Fiber Reinforced Plastic (FRP), polyurethane (polyurethane), polyacrylate (polyacrylate), and polydimethylsiloxane (polydimethylsiloxide).

The window laminate according to the present invention may be constituted by a window film as a decorative film including the functional layer described above, and a touch sensor, an antenna, and the like laminated on the window film.

The decoration film of the present invention described above can be applied to various display devices including a frame pattern. Examples of the Display device include a Plasma Display Panel (PDP), a Light Emitting Diode (LED), an Organic Light Emitting Diode (OLED), a Liquid Crystal Display (LCD), a Thin Film Transistor Liquid Crystal Display (LCD-TFT), and the like.

The present invention has been described above with reference to various embodiments, but this is only for the purpose of example. Those skilled in the art can modify or modify this embodiment in other ways. However, since the scope of the present invention is defined by the appended claims, it can be construed that such variations or modifications are included in the scope of the present invention.

Claims

1. A decorative film, comprising:

a protective layer composed of an organic film; and

and a black matrix formed by patterning the front surface of the protective layer and including a single organic film, wherein a tapered portion of a single step portion is formed at a boundary between the black matrix and the display region.

2. The decoration film according to claim 1, comprising a separation layer joined to a lower portion of the protection layer and composed of an organic film.

3. The decoration film according to claim 1 or 2, comprising a planarization layer formed on the front surfaces of the protection layer and the black matrix and composed of a transparent organic film.

4. The decorative film according to claim 3,

the planarization layer is composed of an overcoat layer having a thickness of 1 μm to 2.5 μm.

5. The decoration film according to claim 1 or 2, comprising an adhesive layer formed on the front surfaces of the protective layer and the black matrix, wherein the adhesive layer has a thickness of 1 μm to 50 μm.

6. The decorative film according to claim 1 or 2,

the black matrix is provided with a slope in the width range of 0.5-2 μm from the display area.

7. The decorative film according to claim 6,

the black matrix has a uniform thickness in a region behind the slope.

8. The decorative film according to claim 7,

the black matrix has a thickness of 1.2 to 2.0 μm and an optical density of 5 or more in a region behind the slope.

9. A window film, comprising:

the decorative film according to claim 1 or 2;

a bonding layer bonded to a back surface of the protective layer or the separation layer of the decorative film; and

a functional layer bonded to the bonding layer.

10. The window film of claim 9,

the functional layer is a transparent film, a polarizing plate, a touch sensor layer, a moisture-proof film or ultra-thin glass.

11. The window film of claim 10, wherein the transparent film is at least one selected from the group consisting of polyvinyl ether phthalate, polyethylene naphthalate, polycarbonate, polyarylate, polyetherimide, polyether sulfonate, polyimide, polyether ether ketone, polyethylene terephthalate, triacetyl cellulose, cyclic olefin polymer, aramid, fiber reinforced plastic, polyurethane, polyacrylate, and polydimethylsiloxane.

12. The window film of claim 11,

the transparent film is composed of polyethylene terephthalate, colorless polyimide, a laminate of polyethylene terephthalate and colorless polyimide, or colorless polyimide containing a hard coat layer.

13. A window laminate, comprising:

a window film as defined in claim 9; and

a touch sensor or antenna laminated on the window film.