KR101993429B1 - Electric color changable film and transparent display comprising the same - Google Patents
Electric color changable film and transparent display comprising the same Download PDFInfo
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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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- electrochromic
- electrochromic film
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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
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]
In
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]
In
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
Referring to FIG. 1, an organic light emitting display device is disclosed as an example of a
In the
The
On the other hand, the
Referring to FIG. 2, the
The
The
Between the
Referring to FIG. 3, the
The
The
In the
Referring to Figure 4, the above-mentioned
On the other hand, the
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
[Formula 1]
In
The present invention by using the above-described acrylic copolymer for the
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
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
[Formula 1]
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.
(%)
(%)
(%)
(%)
cycle
cycle
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)
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).
The acrylic copolymer is an electrochromic film, characterized in that represented by the formula (1).
[Formula 1]
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 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.
Electrochromic film, characterized in that the thickness of the counter electrode is 200 to 800nm.
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).
The acrylic copolymer is a transparent display, characterized in that represented by the formula (1).
[Formula 1]
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 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 a transparent display, characterized in that 200 to 800nm.
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