KR20140069679A - Light source controllable electrochromic thim film element and display device comprising the same - Google Patents
Light source controllable electrochromic thim film element and display device comprising the same Download PDFInfo
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- KR20140069679A KR20140069679A KR1020120137246A KR20120137246A KR20140069679A KR 20140069679 A KR20140069679 A KR 20140069679A KR 1020120137246 A KR1020120137246 A KR 1020120137246A KR 20120137246 A KR20120137246 A KR 20120137246A KR 20140069679 A KR20140069679 A KR 20140069679A
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- thin film
- electrochromic thin
- display device
- electrochromic
- electrodes
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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
-
- 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
- G02F1/157—Structural association of cells with optical devices, e.g. reflectors or illuminating devices
Abstract
Description
The present invention relates to an electrochromic thin film device capable of controlling an external light source and a display device including the same.
The electrochromic phenomenon refers to a phenomenon in which the color reversibly changes in the direction of the electric field when a voltage is applied. The material of the electrochromic material is a material which can reversibly change the optical characteristics of the material by the electrochemical oxidation or reduction reaction. do. Therefore, the color can be selectively controlled by adjusting the applied voltage and current direction. Electrochromic materials include metal oxides such as tungsten, iridium, nickel, and vanadium; organic materials such as viols and quinones; and conductive polymers such as polythiophenes, polyanilines, and polypyrroles. In particular, electrochromic devices incorporating conductive polymers can display various colors by changing their molecular structure, and have advantages of low operating voltage, light weight, memory, and simple manufacturing process, Have been studied extensively.
The present invention relates to an electrochromic thin film device capable of realizing a transparent thin film through switching in the room as well as absorption control of an external high light source by using a thin film having various absorptions according to oxidation and reduction states generated by electrochemical switching, To provide a display device.
The present invention relates to an electrochromic thin film device capable of controlling an external light source and a display device including the electrochromic thin film device. As one example of the electrochromic thin film device,
Electrodes disposed at regular intervals;
An electrochromic thin film formed on one surface of at least one of the electrodes, the electrochromic thin film controlling the degree of absorption of incident light incident from an external light source;
An electrolyte layer formed between oppositely disposed electrodes;
And a power source electrically connected to the oppositely disposed electrodes to apply a voltage.
In addition, the present invention can provide a display device including the electrochromic thin film device.
The electrochromic thin film device and the display device including the electrochromic thin film device according to the present invention can be electrochemically switched and have a simple manufacturing process and thus can be highly competitive in terms of production and cost and can mass produce a material and a display including the same have. In addition, it can exert high clarity both in the outside and inside, and can be applied to transparent displays, smart phones and tablet PCs.
1 is a schematic diagram of an electrochromic thin film device according to an embodiment of the present invention in one embodiment.
2 to 5 are schematic views of a display device including an electrochromic thin film device according to the present invention, in each embodiment.
FIG. 6 is a comparative photograph of an electrochromic thin film according to an embodiment of the present invention and an electrochromic thin film according to an embodiment of the present invention.
FIG. 7 is a comparative photograph of an electrochromic thin film according to an embodiment of the present invention and an electrochromic thin film according to an embodiment of the present invention.
FIG. 8 is a photograph showing an oxidation state control by electrochemical switching of an electrochromic thin film containing no dye according to an embodiment of the present invention.
FIG. 9 is a photograph showing an oxidation state control through electrochemical switching of an electrochromic thin film including a dye according to an embodiment of the present invention.
The present invention relates to an electrochromic thin film device capable of controlling an external light source and a display device including the electrochromic thin film device. As one example of the electrochromic thin film device,
Electrodes disposed at regular intervals;
An electrochromic thin film formed on one surface of at least one of the electrodes, the electrochromic thin film controlling the degree of absorption of incident light incident from an external light source;
An electrolyte layer formed between oppositely disposed electrodes;
And a power source that is electrically connected to the oppositely disposed electrodes and applies a voltage.
The electrodes disposed opposite to each other at the predetermined intervals of the electrochromic thin film elements may be transparent electrodes and may be in the form of two electrodes or three electrodes. For example, the two electrodes may mean an electrode system using two electrodes including a counter electrode and a working electrode, and the three electrodes may be three electrodes including a counter electrode, a reference electrode, and a working electrode, May refer to the electrode system used.
The electrochromic thin film may have an oxidized state changed by electrochemical switching. The electrochromic coloration refers to a phenomenon in which the color reversibly changes in the direction of the electric field when a voltage is applied. Specifically, when electrochemical coloring is applied, an electrochemical redox reaction of a substance takes place in the direction of the electric field, and at this time, a change in the absorbance of the accompanying material is reversibly observed in the visible light region. For example, when a color develops in a reduced state and becomes colorless in an oxidized state, it is referred to as cathodic coloration and is called anodic coloration when it is colorless in a reducing state and when it is colored in an oxidized state. As described above, the electrochromic thin film can exhibit a color change by a method of causing redox through electrochemical switching.
The electrochromic thin film can be produced by using a mixed solution containing a conductive polymer. The conductive polymer is a polymer having an electrochromic property that changes its light absorption by an electrochemical redox reaction. The conductive polymer is not particularly limited, and examples thereof include polythiophene, polyaniline, polypyrrole, , Polyanthracene, polyfluorene, polycarbazole, polyphenylenevinylene, and derivatives thereof. The term " polyaniline "
The mixed solution may further contain an oxidizing agent, a monomer, an additive and a solvent. Examples of the oxidizing agent include iron (III) p-toluenesulfonate hexahydrate (Iron (III) p-toluenesulfonate hexahydrate), iron (III) chloride hexahydrate Iron (III) chloride hexahydrate and iron (III) chloride. Examples of the additive include pyridine, poly (propylene glycol) block copolymer and poly (ethylene glycol) Block copolymer and the like, and the solvent may include methanol, ethanol, butanol, and the like.
As a result, the electrochromic thin film may exhibit various oxidation states depending on the composition of the mixed solution. Specifically, a thin film having various absorptions according to the content of the oxidizing agent, the monomer, the additive, and the solvent can be prepared, thereby controlling the oxidation state of the mixed solution.
As a result, the electrochromic thin film can exhibit a reversible color change by electrochemical oxidation and reduction by voltage application.
The method of forming the electrochromic thin film is not limited to a specific process. For example, the electrochromic thin film may be formed by a conventional method such as electrochemical polymerization, vapor polymerization, chemical polymerization, and electrochemical polymerization, In the case of a conductive polymer that can be subjected to a solution process, it may be dissolved in a solvent and formed by a method such as spin coating, spray coating, or bar coating. As a result, it is easy to fabricate glass or a flexible thin film. As a result, the thickness of the electrochromic thin film is limited to a range in which the change in absorbance is exhibited by an electrochromic reaction. For example, the thickness may be 50 nm to 10 탆, There may be adjustments depending on the composition of the solution.
The electrochromic thin film may be in a patterned form. For example, fine patterns can be formed on a glass or flexible thin film in a nano size to several micro size. For example, the patterned electrochromic thin film may have a grating in which a discoloring portion having an electrical activity at regular intervals and a non-discoloring portion having no electrical activity are alternately displayed. The size of the grating may be 1 nm to 50 탆. For example, the size of the grating may be 100 nm to 50 탆, 1 탆 to 50 탆, 5 탆 to 30 탆, or 5 탆 to 15 탆. For example, photolithography using a photoresist pattern and e-beam lithography can be used as the method of forming the pattern, but the method is not particularly limited. For example, Fairness In the case of a conducting polymer, it can be formed by an imprinting method, a micromolding in capillaries process, a holography method, or a photo-patterning method. However, the present invention does not exclude that the electrochromic thin film is not patterned.
The electrolyte layer of the electrochromic thin film device may include a liquid electrolyte, a gel electrolyte, a solid electrolyte or a polyelectrolyte. For example, the electrolyte layer may cause charge transfer of the electrolyte and doping or dedoping of the electrolyte into the electrochromic thin film upon application of a voltage. At this time, the ion conductive electrolyte solution may be a solution in which the electrolyte salt is dissolved, and the electrolyte layer may be formed by injecting or vacuuming the electrolyte solution. In this instance, the electrolyte salt is not particularly limited, for example, n-Bu 4 NClO 4, n-Bu 4 NPF 6, NaBF 4, LiClO 4, LiPF 6, LiBF 4, LiN (SO 2 C 2 F 5 ) 2 , LiCF 3 SO 3 , C 2 F 6 LiNO 4 S 2 and K 4 Fe (CN) And the like. The electrolytic salt may be a single compound or a mixture of two or more compounds. Specifically, the electrolyte solution may contain 0.001 to 10 M of an electrolyte salt. For example, the electrolyte salt may comprise 0.001 to 5 M, 0.01 to 5 M, 0.1 to 1 M, or 0.1 to 0.5 M, and may contain 1 M of solvent. Within this range, it is possible to realize high electrochromicity and to prevent the problem of elution of the compound in the solution.
The electrolyte layer may further include at least one of a dye and a pigment for color correction. For example, one or more of the dyes may include 0.001 part by weight to 1 part by weight of solvent. The dyes and pigments are not particularly limited, and examples thereof include azo dyes, nitro ) Dyes, nitroso dyes, anthraquinone dyes, acridine dyes, indigo dyes, and azine dyes.
The electrolyte layer may further include an additive for charge balance. For example, the additive for charge balancing may include 0.001 M to 0.5 M, and the additive is not particularly limited and may include, for example, at least one of metallocene, amine oxide and a derivative thereof. The solvent may also include a solvent, and the solvent is not particularly limited, and examples thereof include dichloromethane, chloroform, acetonitrile, ethylene carbonate (EC), propylene carbonate (PC), tetrahydrofuran (THF) And tilene carbonate.
For example, the electrochromic thin film device manufactured as described above can be described with reference to FIG. 1, an electrochromic thin film 20, an electrolyte layer 30, a power source 40, and a
In addition, the present invention can include a display device including an electrochromic thin film device. The display device may include a liquid crystal display (LCD), a cathode ray tube (CRT), a plasma display panel (PDP), a field emission display (FED), and an organic light emitting diode (OLED) Computers, laptops, navigation, smart phones, tablet PCs, e-books, and wrist watches. For example, the display device may be a transparent display device.
Specifically, the display device includes a display panel; Touch panel; And a protective substrate,
The electrochromic thin film element may be formed between the touch panel and the protective substrate.
For example, an external light source may be incident on the display device, and the external light source may penetrate the electrode and the electrolyte layer to reach the electrochromic thin film. At this time, the absorption of the light source can be controlled through the electrochromic thin film. Specifically, the absorbance of the light source can be controlled from 80% to 5% depending on the state of oxidation or reduction. Here, the absorption degree of 100% means that the light is completely blocked. As a result, electrochromism can be exhibited through the change of the oxidation state depending on the thickness of the thin film and the applied voltage. Therefore, the display device including the electrochromic thin film according to the present invention can achieve clearer and clearer images by adjusting external light by a simple method. The display device can be shown in FIG. 2, the display device includes a
The electrochromic thin film device may be formed on a protective substrate of a display device. In addition, the external light can be adjusted by the above-described method to realize a high definition of the display. The display device can be shown in FIG. 3, the display device includes a
In one embodiment, the electrochromic thin film device may be included in a display device not including a touch panel, for example, as shown in FIGS. 4 and 5. 4 includes a
The display device can be used indoors or outdoors. For example, devices such as smart phones, tablet PCs, navigation and e-books can be used indoors and outdoors variably. At this time, the display device according to the present invention can solve the problem of sharpness and visibility, which is a problem when used outdoors, by using the electrochromic thin film device.
In the display device, the electrochromic thin film device in an outdoor environment where an external light source exists may cause discoloration of the thin film by controlling the absorption of external light, and discoloration of the thin film may not occur in the room. Specifically, the electrochromic thin film device can exhibit electrochromism by controlling the absorption of external light. For example, an electrochromic thin film formed between a touch panel and a protective substrate of a display device or an upper surface of a protective substrate may exhibit electrochromism by controlling the absorption of external light. For example, the degree of absorption of the light source can be controlled by adjusting the oxidation state through voltage switching, thereby maintaining the inherent characteristics of the transparent electrode in the room, and achieving high clarity and visibility in the outdoor environment.
Best Mode for Carrying Out the Invention Hereinafter, the present invention will be described in more detail with reference to examples and drawings based on the above description. The following examples are intended to illustrate the invention and are not intended to limit the scope of the invention.
Example One
Thereby preparing an electrochromic thin film device according to the present invention. Specifically, an electrochromic thin film 20, an electrolyte layer 30, a power source 40, and a
Example 2
A display device including the electrochromic thin film device according to the present invention was manufactured. At this time, the electrochromic thin film device was formed between the touch panel of the display device and the protective substrate. This can be confirmed from FIG.
Example 3
A display device including the electrochromic thin film device according to the present invention was manufactured. At this time, the electrochromic thin film device was formed on the protective substrate of the display device. This can be confirmed from FIG.
Experimental Example One
The electrochromic thin film device manufactured in Example 1 was used to perform an external sharpness test. The results are shown in FIG. 6 and FIG. 6 and 7, (a) an electrochromic thin film device is formed on a transparent electrode and (b) a case where an electrochromic thin film device is formed on the transparent electrode. In this case, I can confirm that it looks even clearer.
Experimental Example 2
The electrochromic thin film device without the dye prepared in Example 1 was used for electrochemical switching on paper to control the oxidation state. The results are shown in FIG. Referring to FIG. 8, it is possible to control the degree of absorption of the light source by controlling the oxidation state through voltage switching of the electrochromic thin film device. Thus, (b) the nature of the transparent electrode can be maintained in the room, (b) High clarity and visibility can be realized.
Experimental Example 3
The electrochromic thin film device including the dye prepared in Example 1 was used for electrochemical switching on paper to control the oxidation state. The results are shown in FIG. Referring to FIG. 9, it is possible to control the degree of absorption of the light source by controlling the oxidation state through voltage switching of the electrochromic thin film device. Thus, in the room, (b) (B) high clarity and visibility can be realized outdoors.
10: electrode
20: Electrochromic thin film
30: electrolyte layer
40: Power supply
50: Spacer
100, 200, 300, 400: Display panel
110, 210, 310, 320: a touch panel
120, 220, 320, 420: an electrochromic thin film element layer
130, 230, 330, and 430:
140, 240, 340, 440: Light sensor
150, 250, 350, 450:
Claims (12)
An electrochromic thin film formed on one surface of at least one of the electrodes, the electrochromic thin film controlling the degree of absorption of incident light incident from an external light source;
An electrolyte layer formed between oppositely disposed electrodes;
And a power source electrically connected to the oppositely disposed electrodes to apply a voltage.
Electrochromic thin film devices in which electrodes arranged at regular intervals are two-electrode or three-electrode type.
The electrochromic thin film has an oxidized state changed by electrochemical switching.
Wherein the electrochromic thin film is a mixed solution containing a conductive polymer.
Wherein the electrochromic thin film is in a patterned form.
Wherein the pattern formed on the electrochromic thin film has a grating in which an electroactive discoloring portion and a non-discoloring portion having no electrical activity cross each other.
The display device includes a display panel; Touch panel; And a protective substrate,
Wherein the electrochromic thin film element is formed between the touch panel and the protective substrate.
The display device includes a display panel; Touch panel; And a protective substrate,
Wherein the electrochromic thin film device is formed on the protective substrate.
Wherein the display device is variable in use indoors and outdoors.
In an outdoor environment where an external light source is present, the electrochromic thin film device modulates the absorption of external light to cause discoloration of the thin film,
And the coloring of the thin film does not occur in the room.
Wherein the display device is a transparent display device.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020120137246A KR20140069679A (en) | 2012-11-29 | 2012-11-29 | Light source controllable electrochromic thim film element and display device comprising the same |
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| Application Number | Priority Date | Filing Date | Title |
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| KR1020120137246A KR20140069679A (en) | 2012-11-29 | 2012-11-29 | Light source controllable electrochromic thim film element and display device comprising the same |
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| KR20140069679A true KR20140069679A (en) | 2014-06-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101599191B1 (en) * | 2014-11-11 | 2016-03-03 | 연세대학교 산학협력단 | Electrochromic material, electrochromic thim film element and display device comprising the same |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101599191B1 (en) * | 2014-11-11 | 2016-03-03 | 연세대학교 산학협력단 | Electrochromic material, electrochromic thim film element and display device comprising the same |
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