KR101993429B1 - Electric color changable film and transparent display comprising the same - Google Patents

Electric color changable film and transparent display comprising the same Download PDF

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KR101993429B1
KR101993429B1 KR1020140154648A KR20140154648A KR101993429B1 KR 101993429 B1 KR101993429 B1 KR 101993429B1 KR 1020140154648 A KR1020140154648 A KR 1020140154648A KR 20140154648 A KR20140154648 A KR 20140154648A KR 101993429 B1 KR101993429 B1 KR 101993429B1
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electrode
electrochromic
electrochromic film
transparent
substrate
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KR20160055352A (en
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엄성용
김진욱
김수연
이화열
김준환
이석호
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엘지디스플레이 주식회사
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/15—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on an electrochromic effect
    • G02F1/153—Constructional details
    • G02F1/155—Electrodes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B32B27/327—Layered products comprising a layer of synthetic resin comprising polyolefins comprising polyolefins obtained by a metallocene or single-site catalyst
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1347—Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells
    • G02F1/13471—Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells in which all the liquid crystal cells or layers remain transparent, e.g. FLC, ECB, DAP, HAN, TN, STN, SBE-LC cells

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  • Nonlinear Science (AREA)
  • Chemical & Material Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mathematical Physics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)

Abstract

An electrochromic film according to an embodiment of the present invention includes an upper substrate, a lower substrate, electrochromic particles and a counter electrode. The upper substrate is positioned with the upper electrode. The upper substrate is positioned with the upper electrode. The lower substrate faces the upper substrate and the lower electrode is located. Electrochromic particles are interposed between the upper substrate and the lower substrate. The counter electrode is located on the upper electrode and consists of an acrylic copolymer.

Description

ELECTRIC COLOR CHANGABLE FILM AND TRANSPARENT DISPLAY COMPRISING THE SAME}

The present invention relates to an electrochromic film and a transparent display including the same.

Flat panel displays (FPDs) are becoming more important with the development of multimedia. Thus, various liquid crystal displays (LCDs), plasma display panels (PDPs), field emission displays (FEDs), organic light emitting displays (Organic Light Emitting Display Devices), etc. Branch-type flat panel displays have been put into practical use. Among them, the liquid crystal display device has better visibility than the cathode ray tube, the average power consumption and the heat generation amount are small, and the organic light emitting display device has a fast response speed of 1 ms or less, low power consumption, Since it is self-luminous, there is no problem in viewing angle, and thus, it is drawing attention as a next generation flat panel display.

Recently, development of transparent displays has been actively performed. Among them, the organic light emitting display device may include a minimum light emitting part, and the remaining area may be configured as a transparent part through which light can be transmitted. The transparent display may include a variable light blocking plate that is transparent or opaque at the rear of the display and may be used as a transparent display or an opaque display according to a user's selection.

Conventional strip light shielding plates include PDLC or PNLC using liquid crystals, and electrochromic light blocking plates using black oil or electrochromic particles. The PDLC or PNLC has a low optical characteristic due to a high power consumption in terms of display and a trade-off relationship between transmittance and light blocking rate due to voltage being applied in the transparent mode. On the other hand, the electrochromic light blocking plate has the advantage that the voltage does not need to be applied in the transparent mode, but when using black oil, there is a problem of leakage of internal oil, when using the electrochromic particles, high driving voltage is required in the light shielding mode. In many cases, the service life is reduced.

The present invention improves power consumption and optical properties, and provides an electrochromic film having an increased lifetime and a transparent display including the same.

In order to achieve the above object, the electrochromic film according to an embodiment of the present invention includes an upper substrate, a lower substrate, electrochromic particles and a counter electrode. The upper substrate is positioned with the upper electrode. The upper substrate is positioned with the upper electrode. The lower substrate faces the upper substrate and the lower electrode is located. Electrochromic particles are interposed between the upper substrate and the lower substrate. The counter electrode is located on the upper electrode and consists of an acrylic copolymer.

Acrylic copolymers include metallocenes.

The counter electrode includes triaylamine salt.

The acrylic copolymer is represented by the following formula (1).

[Formula 1]

Figure 112019022682352-pat00015

In Formula 1, l, m and n are each one or more natural numbers, Me is any one selected from Ti, V, Cr, Fe, Co, Ni, Ru, Os and Mn, R is an alkyl group having 1 to 15 carbon atoms .

The counter electrode is positioned on one surface of the upper electrode between the upper electrode and the lower electrode.

The thickness of the counter electrode is 200 to 800 nm.

In addition, the transparent display according to an embodiment of the present invention includes a display panel and an electrochromic film. The display panel implements an image. The electrochromic film includes an upper substrate, a lower substrate, electrochromic particles and a counter electrode. The upper substrate is positioned with the upper electrode. The upper substrate is positioned with the upper electrode. The lower substrate faces the upper substrate and the lower electrode is located. Electrochromic particles are interposed between the upper substrate and the lower substrate. The counter electrode is located on the upper electrode and consists of an acrylic copolymer.

Acrylic copolymers include metallocenes.

The counter electrode includes triaylamine salt.

The acrylic copolymer is represented by the following formula (1).

[Formula 1]

Figure 112019022682352-pat00016

In Formula 1, l, m and n are each one or more natural numbers, Me is any one selected from Ti, V, Cr, Fe, Co, Ni, Ru, Os and Mn, R is an alkyl group having 1 to 15 carbon atoms .

The counter electrode is positioned on one surface of the upper electrode between the upper electrode and the lower electrode.

The thickness of the counter electrode is 200 to 800 nm.

Electrochromic film and a display device including the same according to an embodiment of the present invention by forming a counter electrode comprising an acrylic copolymer, it is possible to improve the power consumption and optical properties of the electrochromic film, electrochromic when repeated driving There is an advantage that the life of the film does not decrease. Therefore, there is an advantage to improve the power consumption and the display quality of the transparent display including the electrochromic film.

1 is a cross-sectional view of a transparent display according to an embodiment of the present invention.
Figure 2 is a cross-sectional view showing an electrochromic film according to an embodiment of the present invention.
3 is a cross-sectional view showing an electrochromic particle according to an embodiment of the present invention.
Figure 4 is a view showing the operation of the electrochromic film according to an embodiment of the present invention.
5 is a graph showing the transmittance with respect to the driving voltage of the electrochromic film prepared according to Comparative Examples 1, 2 and Example.
6 is a black and transparent color coordinates shown by driving black and transparent in the electrochromic film prepared according to Comparative Examples 1, 2 and Example.
7 is a graph showing the transmittance according to the number of cycles of repeated driving in the electrochromic film prepared according to an embodiment of the present invention.
8 is a graph showing the transmittance according to the continuous driving time in the electrochromic film prepared according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view of a transparent display according to an embodiment of the present invention, Figure 2 is a cross-sectional view showing an electrochromic film according to an embodiment of the present invention, Figure 3 is an electrochromic particle according to an embodiment of the present invention 4 is a cross-sectional view showing the operation of the electrochromic film according to an embodiment of the present invention.

Referring to FIG. 1, an organic light emitting display device is disclosed as an example of a transparent display 100 in an embodiment of the present invention. However, the transparent display 100 of the present invention is not limited to an organic light emitting display device, and is applicable to a liquid crystal display device, a plasma display, an electrophoretic display device, and the like.

In the OLED display 100, the buffer layer 110 is positioned on the substrate 105, and the active layer 115 is positioned on the buffer layer 110. The gate insulating layer 120 is positioned on the active layer 115. The gate electrode 130 is positioned on the gate insulating layer 120, and the gate electrode 130 is positioned to correspond to the active layer 115. An interlayer insulating layer 135 is positioned on the gate electrode 130. The thin film transistor TFT is formed by placing the source electrode 145a and the drain electrode 145b connected to the active layer 115 through the contact holes 140a and 140b on the interlayer insulating layer 135.

The passivation layer 150 is disposed on the thin film transistor TFT, and the first electrode 160 connected to the drain electrode 145b is positioned through the via hole 155. The bank layer 165 including the opening 163 exposing the first electrode 160 is positioned. The organic layer 170 is positioned on the first electrode 160, and the second electrode 180 is positioned on the organic layer 170 to form the organic light emitting display device 100.

On the other hand, the electrochromic film 200 that can control the transmittance of light is positioned on one surface of the substrate 105 of the organic light emitting display device 100 described above.

Referring to FIG. 2, the electrochromic film 200 of the present invention includes a lower substrate 210 having a lower electrode 220, an upper substrate 230 having an upper electrode 240, an upper substrate 230, Electrochromic particles 260 injected into the cell gap formed between the lower substrate 210 are included.

The lower substrate 210 and the upper substrate 230 are made of a transparent and flexible plastic substrate, for example, polyethylene naphthalate (PEN), polyethylene terephthalate (PET), polyethylene ether phthalate ( poly ethylene ether phthalate, polycarbonate (PC), polyarylate, polyether imide, polyether sulfonate, polyimide or polyacrylate It may be made of any one or more of the selected.

The lower electrode 220 formed on the lower substrate 210 and the upper electrode 240 formed on the upper substrate 230 are transparent electrodes, for example, transparent conductive materials such as indium tin oxide (ITO) and indium zinc oxide (IZO). It may be made of a material. In addition, the lower electrode 220 may further stack a metal such as copper and molybdenum on the above-described transparent conductive material. The counter electrode 250 is positioned on the upper electrode 240. The counter electrode 250 facilitates a redox reaction by an electric field in the electrochromic film 200, and is made of an acrylic copolymer. The counter electrode 250 has a thickness of 200 to 800 nm. Here, if the thickness of the counter electrode 250 is less than 200nm, the driving characteristics of the electrochromic film is lowered. If the thickness of the counter electrode 250 is more than 800nm, the response speed is lowered due to an increase in resistance. On the other hand, the material of the counter electrode 250 of the present invention will be described later.

Between the lower substrate 210 and the upper substrate 230, an electrochromic particle 260 that is changed in color by an electrolyte 255 and an electric field is injected to constitute the electrochromic film 200 of the present invention. In the electrochromic film 200 configured as described above, when voltage is applied to the lower electrode 220 and the upper electrode 240, the electrochromic particle 260 displays black to block light. On the other hand, when no voltage is applied to the lower electrode 220 and the upper electrode 240, the electrochromic particles 260 are transparent to transmit light. Therefore, it acts as an electrochromic film that can transmit or block light.

Referring to FIG. 3, the electrochromic particle 260 surrounds the core 262 and the core 262, and is made of a shell 264 made of an electrochromic material representing transparent or light blocking black to transmit light. It includes.

The core 262 is made of a material having excellent transmittance to visible light, and may be, for example, indium tin oxide (ITO). Core 262 is spherical or amorphous in size from 10 nm to 200 nm, more preferably from 5 nm to 100 nm. The core 262 may use a porous material to improve discoloration characteristics of the shell 264, and a conductive core material to increase the mobility of electrons. The core 262 may have high transmittance to visible light and smooth flow of electrons. And the larger the specific surface area, the better.

The shell 264 uses a principle that the electrochromic material is reversibly changed in color as the electrochromic material is oxidized or reduced by ions or electrons. For example, the inorganic electrochromic material is WO 3 , NiOxHy, Nb 2 O 5 , TiO. 2 , MoO 3 , V 2 O 5 , and the like, and polymers including repeating units derived from conductive polymers such as thiophene, carbazole, phenylene vinylene, acetylene, aniline, phenylenediamine, pyrrole monomers, and the like. And viologen derivatives, phenothiazine, tetrathiafulvalene and the like can be used. However, any material may be used as long as the shell layer outside the particle becomes transparent due to electrochromic and does not interfere with light transmission. Since the electrochromic material of the shell 264 exhibits black shielding and transparent transmission, the electrochromic material should be a material that changes from a transparent state to black or changes from a black state to a transparent state when the electrochromic material is selected. If it is difficult to realize black with one color, the electrochromic material may emit colored oil in the following combinations, and it may be a combination of cyan, yellow, magenta, or a combination of red, green, and blue. You can also express black.

In the shell 264 surrounding the core 262, the electrochromic material constituting the shell 264 is chemically coupled to the core 262 by a linker. The linker may be used without limitation as long as the linker is bound to the core 262 and may be combined with the electrochromic material of the shell 264 in a synthesis reaction with the shell 264. For example, 3-aminopropyltriethoxy Materials such as silanes can be used. The electrochromic particles of the core / shell type prepared in the present invention may be dispersed in a transparent electrolyte fluid or mixed with a transparent solid electrolyte or a polymer / gel electrolyte to form a coating or film. The electrochromic particles 260 thus formed are operated by shielding or transmitting the color of the core 262 by the shell 264, which is an electrochromic material, depending on whether an electric field is formed. For example, when the shell 264 changes from black to transmissive or transmissive to black, when the shell 264 is black, external incident light is shielded and black is realized. When the shell 264 is transparent, external light is transmitted and transparent Is implemented.

Referring to Figure 4, the above-mentioned electrochromic film 200 is operated as follows. The electrochromic film 200 is positioned on the rear side of the organic light emitting display device 100 which is a transparent display for implementing an image. The electrochromic particles 260 of the electrochromic film 200 change from transparent to black depending on whether an electric field is formed in the electrolyte 255. If the user wants an opaque display, when the electric field is formed between the lower electrode 220 and the upper electrode 240, the electrochromic particles 260 appear black and light is blocked. On the other hand, when the user wants a transparent display, if the electric field is not formed between the lower electrode 220 and the upper electrode 240, the electrochromic particle 260 is transparent and light is transmitted. Therefore, the organic light emitting display device according to the exemplary embodiment of the present invention may implement a transparent or opaque display by including the electrochromic film 200.

On the other hand, the counter electrode 250 of the electrochromic film 200 according to an embodiment of the present invention described above serves to facilitate the redox reaction by the electric field in the electrochromic film 200. In order to improve the characteristics of the counter electrode 250, the present inventors introduced a metallocene moiety (Metallocene moiety) in the acrylic backbone and an acrylic copolymer including a triarylamine salt.

The metallocene moiety introduced into the acrylic backbone smoothes the balance of ions in the electrolyte by an oxidation-reduction reaction through the exchange of electrons. Triarylamines introduced into the acrylic copolymer are introduced in the form of salts to facilitate discoloration of the electrochromic particles. The triarylamine is introduced in the form of a salt so that it is insoluble with the solid electrolyte and cannot be moved into the electrolyte. In addition, the alkyl group having 1 to 15 carbon atoms introduced into the functional group of the acrylic copolymer increases the solvent solubility of the coating liquid depending on the length and type to improve the coating properties.

More specifically, the counter electrode 250 of the present invention uses an acrylic copolymer represented by the following formula (1).

[Formula 1]

Figure 112019022682352-pat00017

In Formula 1, l, m and n are each one or more natural numbers, Me is any one selected from Ti, V, Cr, Fe, Co, Ni, Ru, Os and Mn, R is an alkyl group having 1 to 15 carbon atoms to be.

The present invention by using the above-described acrylic copolymer for the counter electrode 250, to smooth the balance of ions in the electrolyte and to improve the coating properties, to facilitate the discoloration of the electrochromic particles to improve the light shielding characteristics of the electrochromic film Let's do it.

Hereinafter, a synthesis example of the acrylic copolymer of the present invention will be described in detail in the following Examples. However, the following examples are merely to illustrate the present invention is not limited to the following examples.

Synthesis of Acrylic Compound Represented by Formula 1

2.12 g (0.01 mol) of vinyl ferrocene iron compound, 0.36 g (0.005 mol) of acrylic acid, ethylhexyl After 0.18 g (0.001 mol) of acrylates were mixed, wako V65 (2, 2 azobis-2,4-dimethylvaleronitrile) was added at 10% by weight of the monomer sum to prepare a yellow clear solution.

Subsequently, the reaction solution was gradually heated up to 75 ° C. in a nitrogen atmosphere, and stirred for 8 hours to prepare a red acrylic copolymer. An excessive amount of triphenylamine was added to form a polymer salt. The copolymer thus prepared was precipitated and purified in ethanol, and then dissolved in chlorobenzene at 10% by weight and subjected to a filter to prepare a coating solution. As a result of measuring the molecular weight of the copolymer through GPC, it was confirmed that the copolymer was 8000 mW.

Hereinafter, an embodiment of preparing an electrochromic film using the coating solution of the acrylic copolymer prepared in the above synthesis example will be described. The material of the following electrochromic film does not limit the scope of the present invention.

Comparative Example 1

After ITO was laminated on each of the two PET films with a thickness of 1500 kPa, the upper electrode and the lower electrode were formed, and these films were bonded with a sealant. An electrochromic film was prepared by mixing an electrochromic material showing transparent and black colors in a lithium electrolyte.

Comparative Example 2

Under the same process conditions as those of Comparative Example 1 described above, an electrochromic film was prepared by differently forming a counter electrode by stacking antimony tin oxide (SbSnO) at a thickness of 200 nm on the upper electrode.

<Example>

Under the same process conditions as those of Comparative Example 1 described above, an electrochromic film was prepared by differently forming a counter electrode by coating an acrylic copolymer represented by the following Chemical Formula 1 with a thickness of 200 nm on the upper electrode.

[Formula 1]

Figure 112019022682352-pat00018

The transmittance with respect to the driving voltage of the electrochromic films prepared according to Comparative Examples 1 and 2 described above is measured and shown in FIG. 5, and the color coordinates are shown by driving black and transparent.

Referring to FIG. 5, the driving voltage of Comparative Example 2 with the counter electrode is reduced compared to Comparative Example 1 without the counter electrode, but the embodiment with the counter electrode of the present invention has a driving voltage higher than that of Comparative Examples 1 and 2. It can be seen that it is significantly reduced. In addition, referring to FIG. 6, the transparent color coordinates of the electrochromic film showed CIE_x of 0.328 and CIE_y of 0.345. The black color coordinates of the electrochromic film were CIE_x 0.299 and CIE_y 0.320.

In addition, the electrochromic film prepared according to the embodiment of the present invention is repeatedly shown in black and transparent to measure the optical properties are shown in Table 1 below, and the transmittance according to the number of cycles of the repeated driving is shown in Figure 7 , The transmittance according to the continuous driving time is measured and shown in FIG.



 Straight light Diffused light Transmittance
(%) Color coordinates Shading
(%) Color coordinates Transmittance
(%) Shading
(%) CIE_x CIE_y CIE_x CIE_y Early 82.1 0.328 0.345 91.2 0.294 0.321 87.3 92.1 20,000
cycle 80.7 0.327 0.342 89.9 0.292 0.310 86.7 91.2 50,000
cycle 79.9 0.328 0.340 89.2 0.290 0.314 85.9 90.4

Referring to Table 1 and Figure 7, the electrochromic film prepared according to the embodiment of the present invention, when driving the transparent, initially, 20,000, and 50,000 cycles and looking at the transmittance and color coordinates of the straight light, the color coordinates after the initial and 50,000 cycles driving Represents the equivalent level, and the transmittance after 50,000 cycles was reduced by about 2.2% compared to the initial transmittance. In addition, when the black is driven at the initial, 20,000, and 50,000 cycles, the light shading ratio and the color coordinate of the straight light are shown to be equivalent to the color coordinates after the initial and 50,000 cycle driving, and the shading ratio after the 50,000 cycle driving is about 2% of the initial shading ratio. To a degree. In addition, when the transparent and the black were driven at the initial, 20,000, and 50,000 cycles, the transmittance and the shielding ratio of the diffused light were decreased by about 1.4% compared to the initial transmittance, and the shading ratio was about 1.7 compared to the initial shielding ratio. % Decrease. 8, it was confirmed that the transmittance was maintained at about 80% and the light shielding rate was maintained at about 91% even during 1000 hours of continuous driving time.

Through the above embodiment, the electrochromic film manufactured according to the embodiment of the present invention was confirmed that the power consumption is improved by lowering the driving voltage to about 1V. In addition, it was confirmed that the electrochromic film exhibits excellent optical properties with a transmittance of 80% and a light shielding rate of about 91%. Also,

As described above, the electrochromic film and the display device including the same according to the exemplary embodiment of the present invention may improve the power consumption and optical characteristics of the electrochromic film by forming a counter electrode including an acrylic copolymer. Therefore, there is an advantage to improve the power consumption and the display quality of the transparent display including the electrochromic film.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the above-described technical configuration of the present invention may be embodied in other specific forms by those skilled in the art to which the present invention pertains without changing its technical spirit or essential features. It will be appreciated that it may be practiced. Therefore, the embodiments described above are to be understood as illustrative and not restrictive in all aspects. In addition, the scope of the present invention is shown by the claims below, rather than the above detailed description. Also, it is to be construed that all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts are included in the scope of the present invention.

200: electrochromic film 210: lower substrate
220: lower electrode 230: upper substrate
240: upper electrode 250: counter electrode
260: electrochromic particles

Claims (12)

An upper substrate on which the upper electrode is located;
A lower substrate facing the upper substrate and on which a lower electrode is located;
Electrochromic particles interposed between the upper substrate and the lower substrate; And
Located on the upper electrode, an electrochromic film comprising a counter electrode made of a triarylamine salt (triaylamine salt), and an acrylic copolymer comprising a metallocene (Metallocene).
delete delete According to claim 1,
The acrylic copolymer is an electrochromic film, characterized in that represented by the formula (1).
[Formula 1]
Figure 112019022682352-pat00019

In Formula 1, l, m and n are each one or more natural numbers, Me is any one selected from Ti, V, Cr, Fe, Co, Ni, Ru, Os and Mn, R is an alkyl group having 1 to 15 carbon atoms to be.
According to claim 1,
The counter electrode is an electrochromic film, characterized in that located on one surface of the upper electrode between the upper electrode and the lower electrode.
According to claim 1,
Electrochromic film, characterized in that the thickness of the counter electrode is 200 to 800nm.
A display panel for implementing an image; And
An electrochromic film is disposed on one surface of the display panel.
The electrochromic film,
An upper substrate on which the upper electrode is located;
A lower substrate facing the upper substrate and on which a lower electrode is located;
Electrochromic particles interposed between the upper substrate and the lower substrate; And
Located on the upper electrode, a transparent display comprising a counter electrode made of a triarylamine salt (triaylamine salt), and an acrylic copolymer comprising a metallocene (Metallocene).
delete delete The method of claim 7, wherein
The acrylic copolymer is a transparent display, characterized in that represented by the formula (1).
[Formula 1]
Figure 112019022682352-pat00020

In Formula 1, l, m and n are each one or more natural numbers, Me is any one selected from Ti, V, Cr, Fe, Co, Ni, Ru, Os and Mn, R is an alkyl group having 1 to 15 carbon atoms to be.
The method of claim 7, wherein
The counter electrode is positioned on one surface of the upper electrode between the upper electrode and the lower electrode.
The method of claim 7, wherein
The thickness of the counter electrode is a transparent display, characterized in that 200 to 800nm.
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