WO2011122745A1 - Dispositif d'affichage sur papier électronique - Google Patents

Dispositif d'affichage sur papier électronique Download PDF

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Publication number
WO2011122745A1
WO2011122745A1 PCT/KR2010/006234 KR2010006234W WO2011122745A1 WO 2011122745 A1 WO2011122745 A1 WO 2011122745A1 KR 2010006234 W KR2010006234 W KR 2010006234W WO 2011122745 A1 WO2011122745 A1 WO 2011122745A1
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WIPO (PCT)
Prior art keywords
electrode
electronic paper
carbon nanotube
display device
paper display
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PCT/KR2010/006234
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English (en)
Korean (ko)
Inventor
이승희
강병균
임영진
이영희
이규
Original Assignee
전북대학교산학협력단
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Publication of WO2011122745A1 publication Critical patent/WO2011122745A1/fr

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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 
    • G02F1/165—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 translational movement of particles in a fluid under the influence of an applied field
    • G02F1/166—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 translational movement of particles in a fluid under the influence of an applied field characterised by the electro-optical or magneto-optical effect
    • G02F1/167—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 translational movement of particles in a fluid under the influence of an applied field characterised by the electro-optical or magneto-optical effect by electrophoresis
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B32/00—Carbon; Compounds thereof
    • C01B32/15—Nano-sized carbon materials
    • C01B32/158—Carbon nanotubes
    • 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 
    • G02F1/165—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 translational movement of particles in a fluid under the influence of an applied field
    • G02F1/1675—Constructional details
    • G02F1/16756—Insulating layers
    • 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 
    • G02F1/165—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 translational movement of particles in a fluid under the influence of an applied field
    • G02F1/1675—Constructional details
    • G02F1/16757—Microcapsules
    • 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 
    • G02F1/165—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 translational movement of particles in a fluid under the influence of an applied field
    • G02F1/1675—Constructional details
    • G02F1/1677—Structural association of cells with optical devices, e.g. reflectors or illuminating devices
    • 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 
    • G02F1/165—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 translational movement of particles in a fluid under the influence of an applied field
    • G02F1/1685—Operation of cells; Circuit arrangements affecting the entire cell
    • 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 
    • G02F1/165—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 translational movement of particles in a fluid under the influence of an applied field
    • G02F1/1675—Constructional details
    • G02F2001/1678—Constructional details characterised by the composition or particle type
    • 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
    • G02F2202/00—Materials and properties
    • G02F2202/36—Micro- or nanomaterials

Definitions

  • the present invention relates to an electronic paper display device having improved performance. More specifically, the present invention relates to an electronic paper display device capable of realizing a video.
  • Electronic paper is a display that combines the advantages of paper and the advantages of electronic display, and replaces existing papers such as e-books, electronic newspapers, and electronic dictionaries, mobile phones, PDAs, large billboards, point of purchase billboards, etc. It is expected to be used in various forms in the field.
  • electronic paper has the advantage of being able to update information (information can be updated and modified) and express various kinds of information.
  • the electrophoretic method most widely used includes interposing oppositely charged white particles and white particles between a pair of substrates on which electrodes are formed, and applying a voltage to each of the electrodes to generate a potential difference across the electrodes.
  • An image is displayed in such a way that the dark particles and the white particles are moved to electrodes of opposite polarities, respectively. Since the electrophoresis method has high reflectance, high contrast, and no dependence on the viewing angle, images can be displayed with a paper-like feeling. Moreover, it can display an image by reflecting external light without a backlight, and has the advantage of low power consumption.
  • carbon nanotubes exist in the form of aggregates or clusters in a dielectric medium.
  • CNT carbon nanotube
  • the present invention is to provide an electronic paper display device that can overcome the limitations of the prior art.
  • a first electrode spaced apart from the first substrate and having a second electrode disposed opposite to the first electrode;
  • An electronic paper display element which is characterized by having a reduced light absorption ability while being stretched under an alternating voltage application.
  • the display element is a direct voltage application method and It can be operated by switching between alternating voltage application methods. That is, one of a DC voltage and an AC voltage is applied to the display element, and the power source and the driving circuit can be configured to enable mutual switching (switching) between the DC voltage mode and the AC voltage mode.
  • the applied voltage (the electric field) may be changed to adjust the amount of reflected light emitted from the display element according to the degree of stretching of the carbon nano-lube aggregate.
  • a reflecting plate may be provided on a lower surface of the substrate corresponding to the lower substrate among the first substrate and the second substrate.
  • the substrate of the electronic paper display element is preferably made of glass or transparent plastic (polyethylene terephthalate, polycarbonate, polyethersulfone, polyimide, etc.) in order to minimize the influence on the light transmission and light reflection characteristics. can do.
  • a transparent electrode as the first electrode and the second electrode.
  • a transparent electrode In, Sn, Zn, Ga, Cd, Mg, Be, Ag, Mo, V, Cu, Ir, Rh, W, Co, Cr, Ni, Ti, Mn Transparent electrode materials, such as and La, can be comprised individually or in combination.
  • it consists of indium tin oxide (ITO), indium zinc oxide (HQ), gallium zinc oxide, gallium zinc oxide or aluminum zinc oxide or a combination thereof. can do.
  • the first electrode and / or the second electrode may be a patterned electrode (eg, an electrode consisting of a plurality of electrode elements spaced apart at regular intervals), and preferably the patterned electrode may be lowered. It can be used as an electrode.
  • the patterned electrode can form a horizontal electric field in the carbon nanotube-containing layer when an alternating voltage is applied.
  • an insulating layer may be formed on part or all of the electrode surface.
  • the insulating layer is preferably composed of a material having a relatively low conductivity and transparency.
  • a polymer material such as acrylic resin, epoxy resin, polycarbonate, Si3 ⁇ 4, SiN 4 , SiN x> A1 2 0 3, etc.
  • Inorganic materials can be used.
  • the carbon nanotube-containing layer may further comprise additional particles (typically white particles) having charge and different light absorption properties opposite to the carbon nanotube aggregates.
  • additional particles typically white particles
  • the size (diameter) of the additional particles may be in a range suitable for electrophoresis, for example, in a range of about 20 to 50 nm.
  • the carbon nanotube-containing layer may be in a form in which the carbon nanotube aggregates are dispersed in a dielectric medium in a microcapsule.
  • the microcapsules may further include additional particles having opposite charges and different light absorption properties from the carbon nanoleucom aggregates.
  • the electronic paper display device is characterized in that carbon nanoleubes present in an aggregate form in a dielectric medium can display images by electrophoresis as dark particles having light absorbing ability in a direct current electric field mode.
  • carbon nanoleubes present in an aggregate form in a dielectric medium can display images by electrophoresis as dark particles having light absorbing ability in a direct current electric field mode.
  • FIG. 1 is an enlarged photograph showing the extent to which carbon nanotube aggregates dispersed in a dielectric medium (liquid crystal) are elongated with the strength of an electric field under alternating voltage application;
  • FIGS. 2 and 3 are diagrams (unit cells) schematically showing the principle of displaying an image by electrophoresis in the first embodiment
  • FIGS. 4 and 5 are diagrams (unit cells) schematically showing the principle of displaying an image under alternating voltage application in the first embodiment
  • 6 and 7 are diagrams schematically showing the principle of displaying an image by an electrophoretic method under application of a DC voltage in the second embodiment
  • FIGS. 8 and 9 are diagrams schematically showing a principle of displaying an image under application of an alternating voltage in the second embodiment
  • FIG. 10 is a diagram showing an exemplary structure of a lower electrode pattern applicable in the second embodiment
  • 11 and 12 are diagrams schematically showing a principle of displaying an image by an electrophoretic method under application of a DC voltage in the third embodiment
  • FIG. 13 and 14 are diagrams schematically showing a principle of displaying an image under application of an alternating voltage in the third embodiment.
  • FIG. 15 schematically illustrates an embodiment of applying a color filter in an electronic paper display. It is a figure which shows.
  • the expression “on” or “on” may be used to refer to a relative positional concept, as well as the case where another component or layer is directly located in the mentioned layer. It is to be understood that other layers (middle layers) or components may be interposed or positioned in between. Therefore, unless otherwise used, the expression “directly” can be understood as a relative concept as described above.
  • the expression “below”, “below” or “below” may also be understood to mean the relative position of a layer with another layer.
  • the terms “bright state” and “dark state” can be understood in a relative meaning, in general, electrons mostly transmit incident light to emit (or reflect) bright light. The latter may mean a state (may be referred to as a dark state) that absorbs most of the incident light while the state may be referred to as a white state.
  • carbon nanotube refers to a material in which one carbon atom is bonded (sp2 bond) to three other carbon atoms and constitutes a hexagonal honeycomb shape.
  • Single carbon nanotubes have the same shape as hollow tubes or cylinders (a few nanometers in diameter).
  • Carbon nanotubes are multifunctional materials and are known to have excellent electrical, mechanical, thermal, and optical properties.
  • Carbon nanotubes form aggregates or clusters when present in a constant concentration in a dielectric medium, typically a liquid dielectric medium.
  • a dielectric medium typically a liquid dielectric medium.
  • the present invention is not limited to a particular theory, when the carbon nanotubes are dispersed in the dielectric medium, the interaction between the dielectric medium and the carbon nanotubes increases as the carbon nanotube content increases. It is believed that cohesion may occur between the tubes.
  • a dielectric medium for example, a low volatility dielectric Liquid medium or silicone oil which is a sieve medium can be used.
  • carbon nanotubes are known in the art without particular limitation, such as single-walled carbon nanotubes, double-walled carbon nanotubes, and Multi-walled carbon nanotubes, thin multi-wal led carbon nanotubes, and bundles of carbon nanotubes may be used alone or in combination.
  • the method for obtaining the dispersion of the carbon nanotube aggregates in the dielectric medium is not particularly limited, for example, by sonicating carbon nanotubes in a solvent and mixing the supernatant with the dielectric medium.
  • the solvent may be obtained by removing the solvent.
  • the length of the carbon nanotubes subjected to the ultrasonic treatment may be typically several tens of nanometers to several tens of micrometers.
  • the carbon nanotube arrays described above have a significantly higher value (eg, typically at least about 70) for electroactive constants (a measure of the degree of stretching per unit voltage) compared to conventional electroactive polymers. (V / i / rn) 1 , more typically about 70 to 120 (V / fm) '1 ).
  • Carbon nano-lube itself has high elasticity and good bending characteristics, but it can be said that the degree of stretching according to the voltage is small.
  • the carbon nanotube agglomerates dispersed in the dielectric medium may be stretched to about four times or more and about 15 times as compared to the initial state depending on the material, the strength of the electric field, etc. under alternating voltage application.
  • carbon nanotubes may have a coherent form up to a certain level even at low concentrations (eg about 1 to 3 weight percent) in the dielectric medium, but due to their small amount they are used in display devices. It can be practically difficult. On the other hand, at excessively high concentrations, carbon nanotube arrays may not be stretched evenly under alternating voltage.
  • the concentration of carbon nanotube aggregates in the dispersion is preferably about 0.5 to 50 weight 3 ⁇ 4, more preferably about 1 to 10 weight%, particularly preferably about 1 To 5% by weight.
  • FIG. 1 is an optical microscope photograph showing the extent to which carbon nanoleverium particles dispersed in a dielectric medium (liquid crystal) are elongated according to the intensity of an electric field under alternating voltage (AC, 60 Hz).
  • the carbon nanotube aggregates are stretched as the electric field intensity increases, and the length increases by about 10 times or more than the initial state.
  • the light absorbing ability of the aggregates decreases due to stretching, and thus, almost transparent characteristics are exhibited in the highest stretching state.
  • the force of the electric field when the alternating voltage is applied is greater than or equal to the threshold field of the carbon nanotube aggregate, and the breakdown field (breakdown field). It can be controlled below the electric field in which the collector is destroyed by sustained stretching.
  • the threshold electric field is preferably adjusted to be less than or equal to the maximum stretching electric field.
  • the maximum elongated electric field has a lower value than the breaking electric field, and when a higher electric field is applied after applying the maximum elongating electric field, the coagulation is no longer stretched, and eventually the carbon nanotube aggregate is destroyed when it rises up to the breaking electric field. do.
  • the threshold electric field, the breaking electric field and the maximum elongated electric field may vary depending on the type, content and type of dielectric medium of the carbon nanotubes.
  • the threshold electric field is about
  • the maximum electric field may be about 6 v /.
  • the carbon nanotube aggregate has the lowest light absorption capacity (ie, has a high light transmittance) near the maximum electric field when an alternating voltage is applied, and has a low light transmittance below the threshold electric field.
  • the optical hop capacity or light transmittance
  • the carbon nanotube aggregate may be applied to an electrophoretic display (particularly a reflective display) device because the carbon nanotube aggregate may move to an electrode having opposite polarities while maintaining a unique shape of the aggregate under direct current voltage application. .
  • the carbon nanotube aggregates dispersed in the dielectric medium may function as the dark particles of the device of the electrophoretic electronic paper display, and at the same time, the moving picture may be properly implemented under the application of an alternating voltage. It is desirable to have a size that is capable of exhibiting stretching properties that are adapted to allow.
  • the size of the carbon nanotube aggregates may preferably range from about 10 ran to 30 f ', preferably from about 50 ran to 20;
  • the electronic paper deslaying element may operate while switching DC and AC voltage application modes.
  • the carbon nanotube array may function as a colored particle of a conventional electrophoretic electronic paper display device.
  • the carbon nano-lube aggregates are low in light absorption capability as they are stretched, and the amount of incident light is reflected according to the degree of stretching, so that high gray scale expression is possible.
  • the carbon nanotube aggregates are stretched in the vertical direction.
  • an alternating voltage may be applied to the upper electrode and the lower electrode.
  • the carbon nanotube aggregate can be stretched in the horizontal direction by forming a horizontal electric field by patterning the plurality of electrode elements constituting the lower electrode to be spaced apart from each other.
  • an alternating voltage may be applied only to the patterned lower electrode.
  • This horizontal field formation method is similar to that of IPS ln plane switching and FFS.
  • the three fields (the weaker) of the electric field near the patterned electrode and the electric field near the upper substrate are not the same, the degree of stretching of the carbon nanotube array may be different from the lower side and the upper side. Therefore, in order to obtain a bright state under a lower electric field, a vertical electric field method can be adopted.
  • potentials of the same polarity can be applied to the plurality of electrode elements constituting the patterned electrode.
  • a potential of opposite polarities may be applied to some of the plurality of electrode elements and the remaining electrode elements.
  • two of the three electrode elements can be configured to apply the same polarity potential to the other electrode element and the other one of the electrode elements.
  • FIGS. 2 and 3 are diagrams schematically showing the principle of displaying an image by an electrophoretic method in the electronic paper display element 100 according to the first embodiment (DC voltage mode).
  • the upper electrode 102 is attached to the lower surface of the upper substrate 101, while the lower electrode 103 is formed on the lower substrate 104 with a space on the lower side thereof.
  • the upper electrode 102 and the lower electrode 103 are arranged to face each other, and the carbon nanotube aggregate 105 and the white particles 106 are disposed in the dielectric medium 111 between the upper electrode and the lower electrode. It is distributed.
  • a reflecting plate 114 may be formed on the lower surface of the lower substrate 104, and the incident light 108 passes through the upper substrate 101 and the upper electrode 102 to the cell space (the upper electrode and the lower electrode).
  • the reflector may be made of a metal material having a high reflectance.
  • Such a reflective layer can be composed of, for example, Al, Ag, Cr, Mo, Au, Cu or the like alone or in combination.
  • the carbon nanotube aggregate 105 has, for example, a (-) charge, while the white particles 106 are charged to have a (+) charge, and depending on the charging treatment, The reverse is also possible.
  • white particle typical white pigments, such as titania and antimony trioxide, can be used, for example.
  • the upper electrode 102 and the lower electrode 103 have positive (+) potential and negative ( ⁇ ), respectively.
  • FIG. 3 Potential is applied, and vice versa in FIG. 3. Therefore, in FIG. 2, by the potential difference between the upper electrode 102 and the lower electrode 103, the carbon nanotube array 105 having the ( ⁇ ) charge is moved toward the upper electrode 102 by the electrostatic attraction. On the other hand, the white particles 106 also move toward the lower electrode 103 by electrostatic attraction. At this time, the incident light 108 is absorbed by the carbon nano-lube aggregate 105 which is a dark particle, and displays the dark state. On the other hand, in FIG. 3, the carbon nanotube aggregate 105 moves toward the lower electrode 103, and the white particles 106 move toward the upper electrode 102 to reflect the incident light 108 to the reflected light 109. Because it emits, it can display the bright state.
  • FIGS. 4 and 5 are diagrams schematically showing the principle of displaying an image in the electronic paper display element 100 according to the first embodiment (AC voltage mode).
  • the alternating voltage (the number of the upper electrode 102 and the lower electrode 103) Direct electric field)
  • a vertical carbon field is formed so that the carbon nanotube array
  • the elongated carbon nanotubes 105 is stretched in the vertical direction, and the light absorption capacity is lowered depending on the stretching degree. As a result, the incident light 108 gradually passes through the cell space, is reflected by the white particles 106 distributed on the lower electrode side, and is emitted to the reflected light 109. After that, when the voltage application is stopped, the elongated carbon nanotubes 105 return to their original form to reduce light transmittance.
  • 6 and 7 are diagrams schematically showing the principle of displaying an image by an electrophoretic method under application of a DC voltage in the second embodiment.
  • FIGS. 8 and 9 are diagrams schematically showing the principle of displaying an image under application of an alternating voltage in the second embodiment.
  • FIG. 10 is a diagram showing an exemplary structure of a lower electrode pattern applicable in the above embodiment.
  • the dark and the bright states may be displayed without using the white particles.
  • a white coating layer (not shown) may be formed on the reflecting plate 114.
  • White pigments usable for such coating layers are, for example, barium titanate (BaTi0 3 ), strontium titanate
  • the lower electrode 213 is configured as a patterned electrode so as to form a horizontal electric field when an alternating voltage is applied as described above.
  • the pattern may be formed by a photolithography method which is well known in the art, but is not limited to a specific method.
  • the substrate may be a stripe pattern formed at regular intervals in the width (length) direction of the lower substrate surface.
  • the distance between the patterns of the lower electrode may be in a range of about 5 to 40 im, preferably about 5 to 10 // m, so as to be suitable for forming a horizontal electric field when an AC voltage is applied.
  • an insulating layer 215 is formed on the patterned lower electrode 213 so as to suppress cell damage or deformation of the material inside the cell by direct contact with the electrode.
  • This insulating layer may be formed on the lower surface of the upper electrode 202 in some cases (for example, when applying a DC voltage or when forming a vertical electric field by applying an AC voltage).
  • the positive electrode and the positive electrode at the upper electrode 202 and the lower electrode 213 (composed of three electrode elements spaced at regular intervals, 213a, 213b and 213c), respectively, and ( -) A potential is applied, wherein the carbon nanotube array 205 having a (-) charge is moved toward the upper electrode 202 by electrostatic attraction, and darkens as it absorbs incident light 208. Display the status.
  • the carbon nanotube array 205 is perpendicular to the electrode element of the lower electrode 213 patterned according to the direction of the electric field (arrow). It moves toward the upper electrode 202 while drawing a parabolic path, and is distributed on the lower surface of the upper electrode 202 to absorb the incident light 208.
  • Such a voltage application method may be achieved by a driving circuit technique known in the art (see FIG. 10), and a detailed description thereof will be omitted.
  • the carbon nanotube aggregates 205 are distributed near the electrode elements 213a and 213c, while the carbon nanotube aggregates are not distributed near the electrode elements 213b.
  • the non-regional area reflects the incident light 208 and emits the reflected light 209 (bright state).
  • the characteristics of the reflected light 209 can be adjusted by changing the pattern of the lower electrode 213 and the voltage application method.
  • a white pigment coating layer (not shown) may be formed on the reflecting plate 214 to emit white reflected light.
  • FIG. 8 illustrates the inside of a cell of an electronic paper display device before applying an alternating voltage, and before the alternating voltage is applied, the carbon nanotube aggregate 205 is formed in a dielectric. Since it is uniformly dispersed in the medium 211 and absorbs a substantial portion of the incident light 208, it displays a kind of dark state.
  • FIG 9 shows the inside of a cell of an electronic paper display element under alternating voltage application (horizontal electric field).
  • an alternating voltage is applied only to the patterned lower electrode 213 to form a horizontal electric field in the cell space, whereby the carbon nanotube array 205 is laterally stretched to reduce the light absorption ability. do.
  • the maximum stretching electric field is formed, the incident light 208 is reflected almost as it is and is emitted as the reflected light 209 since the light absorbing ability is substantially lost.
  • the amount of stretching of the incident light and the amount of reflected light can be changed by adjusting the degree of stretching, high gray scale expression is possible.
  • the voltage is removed, the carbon nanotube housing 205 returns to its original shape to display the dark state.
  • 11 and 12 are diagrams schematically showing the principle of displaying an image by an electrophoretic method under application of a DC voltage in the third embodiment.
  • 13 and 14 are diagrams schematically showing the principle of displaying an image under application of an alternating voltage in the third embodiment.
  • the carbon nanotube aggregate in the microcapsule 307 is the carbon nanotube aggregate in the microcapsule 307
  • microcapsules 305 is dispersed in the dielectric medium.
  • Such microcapsules may be made of a polymeric resin material having light transmittance, such as acrylic resins such as methyl polymethacrylate and ethyl polymethacrylate, urea resin, and the size (diameter) is typically about 20.
  • Microcapsules containing carbon nanolever aggregates may consist of a single or multiple in a single cell.
  • the carbon nanotube aggregates 305 and the white particles 306 are charged to have, for example, negative ( ⁇ ) and positive (+) charges, and vice versa.
  • a positive potential and a negative potential are applied to the upper electrode 302 and the lower electrode 303, respectively, and vice versa in FIG. Therefore, in FIG. 11, the carbon nanotube array 305 having a negative charge moves in the direction of the upper electrode 302, while the white particles 306 move in the direction of the lower electrode 303.
  • Carbon nanotube aggregates are distributed on the upper inner surface of the microcapsules 307, and thus the incident light 308 hops through the microcapsules to indicate the dark state.
  • FIG. 11 Carbon nanotube aggregates are distributed on the upper inner surface of the microcapsules 307, and thus the incident light 308 hops through the microcapsules to indicate the dark state.
  • FIG. 11 Carbon nanotube aggregates are distributed on the upper inner surface of the microcapsules 307, and thus the incident light 308 hops through the microcapsules to indicate the dark state.
  • the carbon nano-lever aggregate 305 moves toward the lower electrode 303, and the white particles 306 move toward the upper electrode 301, so that the upper inner surface of the microcapsule 307 is disposed on the upper electrode 301. Since white particles are distributed, white reflected light 309 is emitted.
  • FIG. 13 shows a state before switching to apply an alternating voltage by switching in the preceding DC voltage mode (when the upper electrode indicates (+)). At this time, since the carbon nanotube aggregate 305 is distributed on the upper inner surface of the microcapsule 307, the dark state is displayed.
  • the carbon nano-lever aggregate 305 is microcapsules.
  • the film is stretched vertically in the upper region of the inner portion, and the light absorbing ability is reduced depending on the stretching degree.
  • the incident light 308 is gradually reflected by the white particles 306 distributed downward in the microcapsules 307 and emitted into the ? White reflected light 309.
  • the stretched carbon nanotubes 305 return to their original shape and display a dark state.
  • FIG. 15 is a view schematically showing an embodiment in which a color filter is applied in an electronic paper display (when a vertical electric field is formed under alternating voltage implications), for example, the electronic paper display element 100 described above. 200, 300) to give full-color display function.
  • the color filter 415 has at least red (R), green (G) and blue color on the lower surface of the upper substrate 401, that is, between the upper substrate 401 and the upper electrode 402. (B) may include areas 415a, 415b, and 415c in which the three primary colors are respectively displayed. Alternatively, a color filter may be provided over the upper substrate 401. At this time, an array of three colors of red (R), green (G), and blue (B) is set as one unit, and this color arrangement can be repeated in a matrix. Since the configuration of the color filter 415 is already known in the display field, particularly in the liquid crystal display field, detailed description thereof will be omitted.
  • cell holes corresponding to the R region 415a, the G region 415b, and the B region 415c are applied under alternating current.
  • the degree of stretching of the carbon nanotube collector 405 in the liver By adjusting the degree of stretching of the carbon nanotube collector 405 in the liver, the amount of reflected light can be adjusted in each color region, thereby realizing full-color.
  • the white color when the color filter is used, the white color can be expressed through the color combination.
  • the use of the white particles described above or the formation of the white coating layer on the reflector may be omitted.
  • the electronic paper display device using carbon nanotubes present in a bulk form in a dielectric medium, is a deep-colored particle having a light absorption ability in a direct current electric field mode.
  • a video may be implemented using a phenomenon in which light absorption ability is reduced according to the degree of stretching. Therefore, various images can be realized by a simple operation such as switching between the DC voltage mode and the AC voltage mode in a single display device. Furthermore, when a color filter or the like is provided, the image may be displayed in full color.
  • the present invention relates to an electronic paper display device capable of realizing a video and can be used industrially.

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  • Physics & Mathematics (AREA)
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  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
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Abstract

La présente invention concerne un dispositif d'affichage électronique offrant des performances améliorées, qui permet de lire des séquences vidéo grâce à des agrégats de nanotubes de carbone.
PCT/KR2010/006234 2010-03-30 2010-09-13 Dispositif d'affichage sur papier électronique WO2011122745A1 (fr)

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KR1020100028269A KR101140006B1 (ko) 2010-03-30 2010-03-30 전자종이 디스플레이 소자
KR10-2010-0028269 2010-03-30

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WO2011122745A1 true WO2011122745A1 (fr) 2011-10-06

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114333674A (zh) * 2021-12-30 2022-04-12 京东方科技集团股份有限公司 一种反射型显示面板及制作方法

Citations (4)

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Publication number Priority date Publication date Assignee Title
KR20070008977A (ko) * 2005-07-14 2007-01-18 엘지전자 주식회사 전기영동 입자 및 이를 이용한 전기영동 디스플레이
KR20070032461A (ko) * 2005-09-16 2007-03-22 삼성전자주식회사 탄소나노튜브를 이용한 광전기 변색 소자
JP2007121677A (ja) * 2005-10-28 2007-05-17 Fuji Xerox Co Ltd 表示媒体および表示素子、並びに画像表示方法
KR20100019818A (ko) * 2008-08-11 2010-02-19 삼성전자주식회사 전기영동표시장치

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20070008977A (ko) * 2005-07-14 2007-01-18 엘지전자 주식회사 전기영동 입자 및 이를 이용한 전기영동 디스플레이
KR20070032461A (ko) * 2005-09-16 2007-03-22 삼성전자주식회사 탄소나노튜브를 이용한 광전기 변색 소자
JP2007121677A (ja) * 2005-10-28 2007-05-17 Fuji Xerox Co Ltd 表示媒体および表示素子、並びに画像表示方法
KR20100019818A (ko) * 2008-08-11 2010-02-19 삼성전자주식회사 전기영동표시장치

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114333674A (zh) * 2021-12-30 2022-04-12 京东方科技集团股份有限公司 一种反射型显示面板及制作方法
CN114333674B (zh) * 2021-12-30 2023-12-12 京东方科技集团股份有限公司 一种反射型显示面板及制作方法

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