KR101896781B1 - Liquid crystal-based film type smart window and the method for same - Google Patents

Abstract

The present invention relates to a method of manufacturing a liquid crystal-based film-type smart window, which provides uniform spacing between two transparent electrode layers disposed side by side to prevent bonding between transparent electrode layers and to deposit a spacer and a binder, And it is an object of the present invention to provide a method of manufacturing a film form of a window. In order to provide the above-mentioned functions, the present invention provides a liquid crystal display device including a glass layer formed to correspond to each other, a transparent electrode layer laminated inside the glass layer corresponding to the liquid crystal layer, a liquid crystal layer injected between the transparent electrode layers, A spacer and a binder for bonding the transparent electrode layer to the spacer, wherein the spacer and the binder are sprayed onto the transparent electrode layer in a colloidal state to maintain a constant gap between the transparent electrode layers.

Description

TECHNICAL FIELD [0001] The present invention relates to a liquid crystal-based film type smart window,

The present invention relates to a method of manufacturing a liquid crystal based smart window, and more preferably, to a method of manufacturing a liquid crystal-based smart window using a film-type transparent window formed by injecting spacers and binders located between transparent electrode layers and injecting liquid crystals and dyes into spaces formed by spacers To a smart window device manufacturing method.

Elctrochromic devices are devices that change the light transmission characteristics using the principle that electric oxidation-reduction reaction proceeds according to the application of electric field and the color of the electrochromic material changes. This is widely used not only for display devices such as mobile phones, camcorders, notebooks, but also for automobile room mirrors and window smart windows.

In recent years, a liquid crystal-based smart window in which such an electrochromic device is used has also become larger, and it has become more and more necessary to keep the gap of the transparent electrode layer uniform over a wide substrate. When the substrate area is large, the substrate is distorted even with a relatively small external force. Therefore, it is necessary to prevent the unevenness of the gap due to such distortion.

As described above, spherical or rod shaped particles of a certain size including glass, alumina, plastic, etc. are dispersed and used as a spacer for maintaining the gap of the transparent electrode layer uniform and constant in the smart window. However, these spacers were randomly dispersed and could not be uniformly dispersed, so that a narrow gap could not be accurately maintained.

Furthermore, the enlargement of the recent display area and the narrowing of the gap between the electrodes in the smart window slightly impairs the uniformity of the gaps between the electrodes, which greatly affects the display performance and deteriorates the display quality such as display irregularities . Therefore, the demand for accuracy and uniformity of the gap between the transparent electrode layers is becoming increasingly severe.

Korean Patent Publication No. 2008-22321 discloses a method of forming an electrochromic layer pattern, a method of manufacturing an electrochromic device using the method, and an electrochromic device having an electrochromic layer pattern. However, a uniform gap is provided using a spacer And the like.

Patent Document 1: Korean Patent Publication No. 2008-22321

SUMMARY OF THE INVENTION It is an object of the present invention to provide a technique for preventing the bonding between transparent electrodes by providing a uniform gap between two transparent electrodes positioned side by side.

Furthermore, the present invention provides a deposition technique for spacers and binders of a liquid crystal based film type smart window, and it is an object of the present invention to provide a film type production method of a liquid crystal based smart window.

The present invention also provides a film-type smart window in which a binder for fixing a spacer on a transparent electrode layer of a liquid crystal-based film-type smart window is provided to improve the fixing force of the spacer.

The objects of the present invention are not limited to the above-mentioned objects, and other objects of the present invention which are not mentioned can be understood by the following description and can be more clearly understood by the embodiments of the present invention. Further, the objects of the present invention can be realized by the means shown in the claims and their combinations.

The liquid crystal-based film type smart window for achieving the object of the present invention includes the following configuration.

A transparent electrode layer laminated on the inner side of the glass layer, a liquid crystal layer interposed between the transparent electrode layers, a spacer disposed in the liquid crystal layer, and a transparent electrode layer for bonding the spacer to the transparent electrode layer. Wherein the spacer and the binder are sprayed onto the transparent electrode layer in a colloidal state to maintain a constant gap between the transparent electrode layers.

The spacer may be formed of a material selected from the group consisting of silicon oxide, silicon nitride, silicon oxynitride, aluminum oxide, aluminum nitride, aluminum oxynitride, acrylic acid, methacrylic acid, polyimide, aromatic polyamide, polybenzoimidazole, Based film type smart window formed of at least one material selected from the group consisting of glass, silicone, latex, polystyrene, and a curable resin composition.

Further, the present invention provides a liquid crystal based film type smart window characterized in that the binder is composed of polyvinyl alcohol which is constituted of water-soluble.

Also, the liquid crystal based film type smart window is characterized in that the spacer and the binder constituted by the colloid state are dispersed in the transparent electrode layer through spin coating.

Also, the liquid-crystal-based film-type smart window is characterized in that the transparent electrode layer injected with the colloid is rubbed.

Also, the binder and the spacer are configured to have a volume ratio of 1: 0.4 to 1:40.

The present invention also provides a liquid crystal based film type smart window characterized in that the area of the spacer and the glass layer has an area ratio of 1:10 to 1: 10000.

Also, the spacer has a size of 0.8 to 20 占 퐉.

The method includes the steps of laminating a transparent electrode layer on the inner side of the glass layer so as to correspond to each other, laminating a colloid obtained by mixing a spacer and a water-soluble binder in the at least one transparent electrode layer, drying the transparent electrode layer in which the colloid is laminated, And aligning the glass layers so as to face each other, and injecting liquid crystal into the space where the spacers are located.

The spacer may be formed of a material selected from the group consisting of silicon oxide, silicon nitride, silicon oxynitride, aluminum oxide, aluminum nitride, aluminum oxynitride, acrylic acid, methacrylic acid, polyimide, aromatic polyamide, polybenzoimidazole, Based film-type smart window, which is formed of at least one selected from the group consisting of glass, silicone, latex, polystyrene, and a curable resin composition.

Further, the present invention provides a method for manufacturing a liquid crystal based film-type smart window, wherein the binder is composed of a water-soluble polyvinyl alcohol.

Also, the spacer and the binder in the colloid state are dispersed in the transparent electrode layer through spin coating, thereby providing a method of manufacturing a liquid crystal based film type smart window.

Also, the transparent electrode layer injected with the colloid is subjected to rubbing treatment.

Also, the binder and the spacer are configured to have a volume ratio of 1: 0.4 to 1:40.

The present invention also provides a method of manufacturing a liquid crystal based film type smart window, wherein the area of the spacer and the glass layer has an area ratio of 1:10 to 1: 10000.

Also, the spacer has a size of 0.8 to 20 占 퐉.

Further, in the step of drying the transparent electrode layer in which the colloid is laminated, the binder is oriented at a position where the spacer and the transparent electrode layer face each other due to surface tension, thereby providing a method of manufacturing a liquid crystal based film type smart window .

Also, the spin coating may spray the colloid at a speed of 2000 to 5000 rpm.

The present invention can obtain the following effects by the above-described embodiment, the constitution described below, the combination, and the use relationship.

The present invention maintains a certain distance between the transparent electrodes in the liquid crystal based film type smart window and has the effect of preventing the problem of the grounding of both transparent electrodes when using a smart window.

Furthermore, the present invention provides a high fixing force of the spacer, and provides an effect of eliminating the problem of the spacers being separated in the process of injecting the liquid crystal.

In addition, there is an effect of providing a film type smart window manufacturing method through a spacer maintaining a constant fixing force.

Fig. 1 shows a spacer arrangement on a liquid crystal based film-type smart window as one embodiment of the present invention.
Figure 2 shows a side cross-sectional view of a liquid crystal based film-type smart window as one embodiment of the present invention.
FIG. 3 shows a spacer distribution diagram of a liquid crystal-based film-type smart window as one embodiment of the present invention.
Fig. 4 shows a configuration of a binder formed on a spacer of a liquid crystal-based film-type smart window according to an embodiment of the present invention.
Figure 5 shows a micrograph of a liquid crystal based film type smart window containing a large amount of binder as a comparative example of the present invention.
Figure 6 shows a micrograph of a liquid crystal based film type smart window containing a large amount of spacers as yet another comparative example of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments of the present invention can be modified in various forms, and the scope of the present invention should not be construed as being limited to the following embodiments. This embodiment is provided to more fully describe the present invention to those skilled in the art.

In the case of the liquid crystal based film type smart window 100 manufacturing method of the present invention, a liquid crystal based film type smart window 100 is provided, wherein a transparent electrode layer 120 located between the glass layers 110, Discloses a colloid of a spacer and an aqueous binder 140 sprayed on the electrode layer 120. When the glass layer 110 is attached to the spacer 130, the liquid crystal and the dye are injected into the space formed by the spacer 130 Thereby forming a liquid crystal-based cell.

In the case of the glass layer 110, it can be constituted based on a transparent film such as a polymer, and further it can be composed of an oxide glass such as a silicate glass, a borate glass, and a phosphate glass.

1 shows a cross-sectional side view of a liquid crystal based film smart smart window 100 as one embodiment of the present invention.

A transparent electrode is laminated on the glass layer 110 based on a glass layer 110 symmetrically formed of the liquid crystal-based smart window 100. The transparent electrode used in the present invention is not particularly limited as long as it is known in the art.

Examples of the conductive material for forming the transparent electrode layer 120 include indium doped tin oxide (ITO), antimony doped tin oxide (ATO), fluorine doped tin oxide (FTO), indium doped zinc oxide (IZO) have. A transparent conductive layer can be formed on the substrate by depositing a conductive material by a known method such as sputtering, electron beam evaporation, chemical vapor deposition, or sol-gel coating.

The colloid liquid including the spacer 130 and the binder 140 may be injected onto at least one transparent electrode layer 120 having the above structure. The colloid liquid is formed on the basis of distilled water. The spacer 130 And the binder 140 are diluted.

The transparent electrode layer 120 may be rubbed to increase the deposition power of the spacer 130 when the mixed colloid is sprayed onto the transparent electrode layer 120. That is, the rubbed transparent electrode layer 120 can provide an effect of facilitating the orientation of the spacer 130 mixed with the colloid when the colloid is sprayed on the surface.

In the case of the spacer 130, the spacers 130 may be formed in a shape capable of forming a constant gap between the electrodes corresponding to each other, more preferably beads.

In the case of the spacer of the present invention, it is possible to use a silicon oxide, silicon nitride, silicon nitride oxide, aluminum oxide, aluminum nitride, aluminum oxynitride, acrylic acid, methacrylic acid, polyimide, aromatic polyamide, polybenzoimidazole, Resin, glass, silicone, latex, polystyrene, and a curable resin composition.

The liquid crystal and the dye are injected into the gap formed by the spacers 130 between the transparent electrode layers 120. The smart window 100 of the present invention can be manufactured in the form of a film.

In the case of the liquid crystal injected into the gaps, a polymer-dispersed liquid crystal (PDLC), a polymer-enhanced liquid crystal (PELC), a polymer-stabilized twisted nematic (PSTN) A polymer having a variety of names including polymer network twisted nematic (PNTN), pixel isolated liquid crystal (PILC), liquid crystal dispersion, and the like.

Figure 2 shows a cross section of a liquid crystal based film smart window 100 configuration as an embodiment of the present invention.

A transparent electrode layer 120 is stacked and positioned on a pair of glass layers 110 and a colloid solution of the spacer 130 and the binder 140 is sprayed onto at least one transparent electrode layer 120, The transparent electrode layer 120 has a certain gap due to the spacers 130 positioned between the transparent electrode layers 120 that are symmetrically formed as shown in FIG. .

More preferably, the drying step of the spacer 130 and the binder 140, which are injected in colloidal form, may be completed before the glass layers 110 including the transparent electrode layer 120 are bonded together.

In addition, the spacers 130 and the binder 140 included in the injected colloid exist between the transparent electrode layers 120 facing each other. The spacer 130 has an area of the glass layer 110 of 1:10 Lt; RTI ID = 0.0 > 1: 10000. ≪ / RTI > More preferably, in the case of the spacer 130, it may be configured to have a size of 0.8 to 20 mu m.

In the case of the mixed colloid of the present invention, the water-soluble binder 140 is mixed based on distilled water, and the binder 140 may be composed of a polymer adhesive. More preferably, in one embodiment of the present invention, it may be composed of polyvinyl alcohol (PVA). The binder 140 is sprayed onto the transparent electrode layer 120 in a colloid state based on distilled water. After the spraying, the binder 140 is separated from the spacer 130 and the transparent electrode layer 120, Is moved to the meeting space.

As described above, the distilled water of the colloidal liquid is evaporated through the drying process, and the binder 140 is diluted in water having a high surface tension. As the Maniscus is locally formed, the spacer 130 And the transparent electrode layer 120. The transparent electrode layer 120 is formed to be positioned between the spacer 130 and the transparent electrode layer 120 and dried.

The binder 140 and the spacer 130 may be configured to have a volume ratio of 1: 0.4 to 1:40 in the case of the binder 140 mixed with the spacer 130 and injected into the transparent electrode layer 120 in a colloidal state have.

In the case of the method of manufacturing a liquid crystal-based film-type smart window 100 of the present invention, the transparent electrode layer 120 is formed on the surface of the glass layer 110 facing the glass layer 110, .

Examples of the conductive material for forming the transparent electrode layer 120 include indium doped tin oxide (ITO), antimony doped tin oxide (ATO), fluorine doped tin oxide (FTO), indium doped zinc oxide (IZO) have. Furthermore, the transparent electrode layer 120 can be formed by depositing a conductive material by a known method such as sputtering, electron beam evaporation, chemical vapor deposition, or sol-gel coating.

A step of laminating a colloid obtained by mixing the spacer 130 and the water-soluble binder 140 on at least one transparent electrode layer 120 is performed. In order to perform the lamination of the colloid, spin coating is performed in one embodiment of the present invention, and coating can be performed at 2000 rpm to 5000 rpm for 20 seconds. More preferably, spin coating can be performed at 5000 rpm for 30 seconds.

In the case of the colloid, the spacer 130 and the water-soluble binder 140 are mixed based on distilled water. The area of the glass layer 110 of the spacer 130 is in the range of 1:10 to 1: 10000 Respectively.

Furthermore, the binder 140 constituting the colloid and the spacer 130 may be configured to have a volume ratio of 1: 0.4 to 1:40.

The colloid sprayed on the transparent electrode layer 120 is configured to undergo a drying process at room temperature or 50 ° C for 20 minutes to 30 minutes. The binder 140 is configured to be oriented at a position where the spacer 130 and the transparent electrode layer 120 face each other due to the high surface tension of water when the spacer 130 and the transparent electrode layer 120). ≪ / RTI >

The transparent electrode layer 120 is formed so as to be adhered to the glass layer 110 to correspond to the glass layer 110 on which the colloidal solution is sprayed and dried, The transparent electrode layer 120 is formed to have a constant gap.

Thereafter, the liquid crystal and the dye are injected into the spaces formed by the spacers 130 in the glass layers 110 corresponding to each other, and the liquid crystal layer is formed in the gap.

FIG. 3 shows a microscope screen in a colloid spray state as an embodiment of the present invention.

As an example of the present invention, a colloid is prepared by diluting a spacer (130) having a size of 10 mu m in diluted polyvinyl alcohol with distilled water at a ratio of 1 wt% of distilled water. The colloid thus formed is sprayed onto the transparent electrode layer 120 by spin coating, and the spin coating speed can be set to 2000 rpm.

As described above, when the colloid is sprayed on the transparent electrode layer 120 through spin coating, the spacers 130 are uniformly dispersed without being clumped, The thickness of the sample is uniformly formed as a whole.

FIG. 4 illustrates a configuration in which the binder 140 is positioned around the spacer 130 after performing the drying process according to an embodiment of the present invention.

That is, the colloid dispersed in the transparent electrode layer 120 is prepared by diluting a spacer 130 of 10 탆 in which diluted polyvinyl alcohol is diluted with distilled water to a ratio of 1 wt% of distilled water. The spacer 130 and the binder 140 are made of 1 : 1.

The colloid dispersed into the transparent electrode layer 120 through spin coating at 3000 rpm is set to have a drying time of room temperature for 20 minutes.

After the drying time, the binder 140 is hardened and fixed near the spacer 130. The water-soluble binder 140 is diluted and sprayed on the distilled water, and when the distilled water evaporates through the drying process, The binder 140 may be configured to be oriented at a position facing the spacer 130 and the transparent electrode layer 120 according to the characteristics of water having a high surface tension.

As described above, the spacer 130 of the present invention provides an effect of increasing the adhesive force with the transparent electrode layer 120 by the mixed water-soluble binder 140.

5 is a comparative example, a binder 140, the configuration is the spacer 130 to the colloidal mixture: a case that is mixed in the ratio of 3 injection, a transparent electrode layer 120, after the through drying process: Binder 140 1 As shown in Fig.

In other words, The above diagram  4, the water-soluble binder ( 140)  When diluted to have a 1: 1 ratio, after performing the drying process, The spacer 130  Included The liquid crystal layer  In some areas, the binder 140 Covered  The configuration Initiate "He said.

In the case of the colloid mixed with the binder 140 as described above, since the binder 140 covers the surface to which the injected liquid crystal is to be brought into contact, the liquid crystal can not be normally aligned, Be weakened .

6 shows another example in which the composition of the spacer 130 is mixed with the colloid mixed solution at a ratio of 2 wt% of the distilled water and is deposited on the transparent electrode layer 120.

According to the comparative example, when the spacer 130 is formed to 10 mu m and the spin coating is performed at 4000 rpm for 20 seconds, the spacer 130 is partially adjacent to the spacer 130. Fig.

That is, when the spacer 130 is mixed with the colloid mixture at a ratio of 2 wt% of the distilled water, as shown in the figure, portions where the plurality of spacers 130 are adjacent to each other appear.

As described above, when the spacer 130 is spin-coated with a colloid having a 2 wt% ratio of distilled water, the dispersing effect of the spacer 130 is lowered.

As described above, the colloid configuration and the spin coating rate, which exhibit the optimum dispersion effect, can be set through the examples and the comparative examples of the present invention, as shown in the following table.

Example Comparative Example Dispersion effect Spacer ratio 1wt% 2wt% 1wt% is well distributed Spacer size 10 탆 10 탆 Binder 140 ratio 1: 1 (binder 140: spacer 130) 1: 1 (binder 140: spacer 130) Spin coating speed 5000rpm 4000rpm Spin coating time 30s 20s In the case of the binder ratio, it means the volume ratio.
In the case of the dispersing effect, it means the uniformity of the spacers dispersed on the transparent electrode layer 120.

As shown in Table 1, in the best embodiment of the present invention, the 10 μm pager has 1 t% of the distilled water, the volume ratio of the binder 140 and the spacer 130 is 1: 1, It can be seen that, when sprayed for 30 seconds in the spin coating mode, it provides the optimum dispersion performance.

The foregoing detailed description is illustrative of the present invention. In addition, the foregoing is intended to illustrate and explain the preferred embodiments of the present invention, and the present invention may be used in various other combinations, modifications, and environments. That is, it is possible to make changes or modifications within the scope of the concept of the invention disclosed herein, within the scope of the disclosure, and / or within the skill and knowledge of the art. The described embodiments are intended to illustrate the best mode for carrying out the technical idea of the present invention and various changes may be made in the specific applications and uses of the present invention. Accordingly, the detailed description of the invention is not intended to limit the invention to the disclosed embodiments. It is also to be understood that the appended claims are intended to cover such other embodiments.

100: Smart Windows
110: glass layer
120: transparent electrode layer
130: Spacer
140: binder

Claims (18)

A glass layer formed to correspond to each other;
A transparent electrode layer laminated on the inside of the glass layer formed to correspond to each other;
A liquid crystal layer injected between the transparent electrode layers;
A spacer located in the liquid crystal layer; And
And a binder diluted with water to adhere the spacer to the transparent electrode layer,
Wherein the spacer and the binder are arranged in a colloidal state and are sprayed on the transparent electrode layer to maintain a constant gap between the transparent electrode layers and the binder is located between the spacer and the transparent electrode layer. window.
The method according to claim 1,
Wherein the spacer is selected from the group consisting of silicon oxide, silicon nitride, silicon oxynitride, aluminum oxide, aluminum nitride, aluminum oxynitride, acrylic acid, methacrylic acid, polyimide, aromatic polyamide, polybenzoimidazole, Wherein at least one member selected from the group consisting of silicone, latex, polystyrene, and a curable resin composition is formed.
The method according to claim 1,
Wherein the binder is composed of polyvinyl alcohol which is water-soluble.
The method according to claim 1,
Wherein the spacer and the binder constituting the colloid state are dispersed in the transparent electrode layer through spin coating.
The method according to claim 1,
Wherein the transparent electrode layer in which the spacer and the binder are injected in a colloidal state is subjected to rubbing treatment.
The method according to claim 1,
Wherein the binder and the spacer are configured to have a volume ratio of 1: 0.4 to 1:40.
The method according to claim 1,
Wherein the area of the spacer and the glass layer has an area ratio of 1:10 to 1: 10000.
The method according to claim 1,
Wherein the spacer has a size of 0.8 to 20 占 퐉.
Stacking a transparent electrode layer inside the glass layer so as to correspond to each other;
Stacking a colloid obtained by mixing a spacer and an aqueous binder in the at least one transparent electrode layer;
Drying the transparent electrode layer on which the colloid is laminated; And
Bonding the glass layers to each other so as to face each other, and injecting liquid crystal into the space where the spacers are located,
Wherein the binder is configured to be positioned between the spacer and the transparent electrode layer through the drying step.
10. The method of claim 9,
Wherein the spacer is selected from the group consisting of silicon oxide, silicon nitride, silicon oxynitride, aluminum oxide, aluminum nitride, aluminum oxynitride, acrylic acid, methacrylic acid, polyimide, aromatic polyamide, polybenzoimidazole, Based film-type smart window is formed of at least one selected from the group consisting of silicone, latex, polystyrene, and a curable resin composition.
10. The method of claim 9,
Wherein the binder is composed of polyvinyl alcohol that is water-soluble.
10. The method of claim 9,
Wherein the spacer and the binder in the colloid state are dispersed in the transparent electrode layer through spin coating.
10. The method of claim 9,
Wherein the transparent electrode layer in which the spacer and the binder are injected in a colloidal state is subjected to rubbing treatment.
10. The method of claim 9,
Wherein the binder and the spacer are configured to have a volume ratio of 1: 0.4 to 1:40.
10. The method of claim 9,
Wherein the area of the spacer and the glass layer has an area ratio of 1:10 to 1: 10000.
10. The method of claim 9,
Wherein the spacer has a size of 0.8 to 20 占 퐉.
10. The method of claim 9,
Wherein the binder is oriented at a position where the spacer and the transparent electrode layer face each other by surface tension in the step of drying the transparent electrode layer in which the colloid is laminated.
13. The method of claim 12,
Wherein the spin coating is sprayed with the colloid at a rate of 2000 to 5000 rpm.

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