WO2008023498A1 - support d'affichage électrophorétique - Google Patents

support d'affichage électrophorétique Download PDF

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Publication number
WO2008023498A1
WO2008023498A1 PCT/JP2007/063077 JP2007063077W WO2008023498A1 WO 2008023498 A1 WO2008023498 A1 WO 2008023498A1 JP 2007063077 W JP2007063077 W JP 2007063077W WO 2008023498 A1 WO2008023498 A1 WO 2008023498A1
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Prior art keywords
particles
charged particles
display
particle
charged
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PCT/JP2007/063077
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English (en)
Japanese (ja)
Inventor
Yumiko Oshika
Original Assignee
Brother Kogyo Kabushiki Kaisha
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Publication of WO2008023498A1 publication Critical patent/WO2008023498A1/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
    • 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

Definitions

  • the present invention relates to an electrophoretic display medium, and more particularly, to an electrophoretic display medium that displays an image using an electrophoretic phenomenon.
  • an electrophoretic display device that can display an image on a display panel (electrophoretic display medium) using an electrophoretic phenomenon.
  • This display panel includes a transparent display substrate and a rear substrate disposed to face the display substrate. Electrodes are formed on the surfaces of the display substrate and the back substrate. A display liquid is sealed between the display substrate and the back substrate via a spacer, and two kinds of charged particles are dispersed in the display liquid. These charged particles are generally composed of black charged particles and white charged particles that are charged to a polarity different from that of the black charged particles.
  • a liquid in which two types of electrophoretic fine particles (charged particles) having different color tones and charging characteristics are dispersed in a highly insulating, low-viscosity, non-colored dispersion medium is used.
  • An encapsulating electrophoretic display element (electrophoretic display medium) is known (for example, see Patent Document 1).
  • each electrophoretic fine particle undergoes electrophoresis. Specifically, one electrophoretic fine particle moves to and adheres to one electrode according to its charging polarity. The other electrophoretic fine particles move to and adhere to the other electrode. At this time, the color tone of the electrophoretic fine particles adhering to the electrode is displayed on the transparent electrode.
  • Patent Document 1 JP-A 62-269124
  • An object of the present disclosure is to provide an electrophoretic display medium capable of improving display switching responsiveness by avoiding collision between charged particles having different polarities.
  • a pair of substrates spaced apart from each other, a display liquid sealed with a spacer interposed between the pair of substrates, and dispersed in the display liquid, by the action of an electric field A pair of charged particles moving in the display liquid, wherein the pair of charged particles is a first charged particle and a second charged particle having a different color and polarity from the first charged particle.
  • Electrophoretic display media with different rates of movement It is.
  • FIG. 1 is a cross-sectional view of a display panel 2.
  • FIG. 2 is a front view of black charged particles 50.
  • FIG. 3 is a front view of white charged particles 60.
  • FIG. 4 is an explanatory diagram showing the movement of black charged particles 50 and white charged particles 60.
  • FIG. 5 is an explanatory diagram showing the movement of black charged particles 50 and white charged particles 60.
  • FIG. 6 is an explanatory diagram showing the movement of black charged particles 50 and white charged particles 60.
  • FIG. 7 is an explanatory diagram showing the movement of black charged particles 50 and white charged particles 60.
  • FIG. 8 is an explanatory diagram showing the movement of black charged particles 50 and white charged particles 60.
  • FIG. 9 is an explanatory diagram showing a test method for a straightness evaluation test.
  • FIG. 10 is a table showing the results of a straightness evaluation test.
  • FIG. 11 is an explanatory diagram showing movement amounts of convex particles 82, spherical particles 81, and dimple particles 83.
  • FIG. 12 is a table showing the results of a display switching time evaluation test.
  • FIG. 13 is an explanatory view showing the movement of black charged particles 50 and white charged particles 60 in display panel 600.
  • FIG. 14 is an explanatory diagram showing the movement of black charged particles 50 and white charged particles 60 in display panel 600.
  • FIG. 15 is an explanatory diagram showing the movement of black charged particles 50 and white charged particles 60 in display panel 600.
  • FIG. 16 is an explanatory diagram showing the movement of black charged particles 50 and white charged particles 60 in the display panel 600.
  • the upper surface of the display panel 2 is the upper surface of the display panel 2, and the lower surface is the lower surface of the display panel 2.
  • the display panel 2 of the present embodiment is mounted on, for example, a portable electronic device.
  • Various images can be displayed by being driven and controlled by a control device (not shown).
  • the display panel 2 includes a display substrate 10 provided horizontally, and a rear substrate 20 disposed horizontally opposite to the display substrate 10 with a spacer 31 interposed therebetween. ing.
  • the separation width between the display substrate 10 and the rear substrate 20 is adjusted to 25 m.
  • a plurality of display portions 30 divided by the partition walls 32 are formed in a lattice shape.
  • the partition wall 32 is provided so as to surround each pixel.
  • the display substrate 10 is formed of a transparent member.
  • the display substrate 10 includes a display layer 11 as a display surface.
  • a transparent display electrode layer 12 for generating an electric field in the display section 30 is provided on the lower surface side of the display layer 11.
  • the display layer 11 is formed of a material having high transparency and high insulation. For example, polyethylene naphthalate, polyether sulfone, polyimide, polyethylene terephthalate, glass and the like are used.
  • the electrode layer 12 is made of a material that has high transparency and can be used as an electrode.
  • indium tin oxide which is a metal oxide, tin oxide doped with fluorine, aluminum oxalate aluminum Doped acid zinc oxide or the like is used.
  • the display layer 11 is a transparent glass substrate.
  • the display electrode layer 12 is a transparent electrode formed of indium tin oxide.
  • the back substrate 20 includes a housing support layer 21 that supports the display panel 2. Further, a back electrode layer 22 corresponding to each display unit 30 is provided on the upper surface of the housing support layer 21.
  • the back electrode layer 22 generates an electric field in each display unit 30.
  • the casing support layer 21 is made of a highly insulating material. For example, glass, an inorganic material such as an insulated metal film, or an organic material such as polyethylene terephthalate is used. Note that each layer forming the back substrate 20 may be transparent or colored, unlike the display substrate 10.
  • the housing support layer 21 is a glass substrate
  • the back electrode layer 22 is an electrode formed of indium tin oxide.
  • Channel CH1 is connected to each back electrode layer 22, and channel CH2 is connected to display electrode layer 12.
  • These channels CH1 and CH2 are controlled by a control device (not shown), and a voltage is applied to the back electrode layer 22 and the display electrode layer 12.
  • a control device not shown
  • a voltage is applied to the back electrode layer 22 and the display electrode layer 12.
  • an electric field is generated in the display unit 30.
  • the display electrode layer 12 when the display electrode layer 12 is set to the reference potential (zero volts) and a positive voltage is applied to the back electrode layer 22, the back electrode layer 22 is positive and the display electrode layer 12 is negative.
  • the back electrode layer 22 is negative and the display electrode layer 12 is positive.
  • the display electrode layer 12 may be set at a reference potential (zero volts).
  • the method for generating the electric field may be other methods.
  • a spacer 31 is provided between the display substrate 10 and the back substrate 20.
  • the spacer 31 is provided along the outer periphery of the display panel 2.
  • a sealed space is formed between the display substrate 10, the back substrate 20, and the spacer 31. This sealed space is evenly divided by the partition wall 32.
  • a plurality of display portions 30 are formed by being divided.
  • Each of the display units 30 corresponds to a pixel. That is, the display panel 2 is a panel in which a plurality of display units 30 are arranged in a lattice pattern.
  • the spacer 31 and the partition wall 32 are made of polyethylene terephthalate resin film.
  • the display liquid 40 is sealed in the sealed space of the display unit 30 of the display panel 2 having such a structure.
  • the display liquid 40 is a dispersion medium in which a plurality of white charged particles 60 and a plurality of black charged particles 50 are dispersed.
  • the dispersion medium refers to a liquid substance in which particles (dispersoid) are dispersed.
  • the display liquid 40 of the present embodiment uses black liquid particles 50 and white charged particles 60 as a dispersoid, and a liquid substance obtained by adding a predetermined amount of a polar solvent to a nonpolar solvent as a dispersion medium.
  • a nonpolar solvent a hydrocarbon solvent is mainly used.
  • no ⁇ raffin solvent (73 wt%) (trade name "Isopar Gj: manufactured by ExxonMobil Co., Ltd.) is used.
  • an alcohol that is soluble in a nonpolar solvent is used as a polar solvent.
  • hexanol is used, and a part of the polar solvent in the display liquid 40 stays around the white charged particles 60 and the black charged particles 50 so that these charged particles are used. The charging property is improved.
  • black charged particles 50 and the white charged particles 60 are suspended in the display liquid 40.
  • the black charged particles 50 are positively charged (+), and the white charged particles 60 are negatively charged ( ⁇ ). Therefore, when an electric field is generated in the display unit 30 with the display substrate 10 side minus and the back substrate 20 side plus, the black charged particles 50 move to the display substrate 10 side, and the white charged particles 60 are the back substrate 20 side. Move to. At this time, black is displayed on the display substrate 10.
  • the black charged particles 50 move to the back substrate 20 side, and the white charged particles 60 are Move to display board 10 side. At this time, the black color displayed on the display substrate 10 is switched to white. As will be described later, the black and white display switching time is greatly affected by the movement time of the black charged particles 50 and the white charged particles 60 in the display liquid.
  • the straightness of charged particles refers to the display base. It shows the ratio of the amount of movement in the direction of the shortest distance to the amount of movement in the direction orthogonal to the direction of the shortest distance between the plate 10 and the back substrate 20. In other words, the amount of movement in the direction of the shortest distance force The greater the amount of movement in the direction perpendicular to the direction of the shortest distance, the higher the straightness of the charged particles. Conversely, the greater the amount of movement in the direction perpendicular to the direction of the shortest distance than the amount of movement in the direction of the shortest distance, the lower the straightness.
  • particles having a surface shape that is not easily resisted by the surrounding liquid have high rectilinearity and are susceptible to ambient resistance, and particles having a surface shape have low rectilinearity.
  • the straightness of the black charged particles 50 and the straightness of the white charged particles 60 are different from each other. Yes. Thereby, since the collision frequency between the black charged particles 50 and the white charged particles 60 can be reduced, the display switching time can be shortened. The effect of shortening the display switching time will be described later.
  • the black charged particles 50 are so-called “polymerized dimple particles”, and have a large number of dimples 51 on a spherical surface.
  • the large number of dimples 51 can improve the straightness when the display liquid 40 is moved. The effect of improving the straightness of the black charged particles 50 by the dimple structure and the evaluation thereof will be described later.
  • the black dimple particles as the basis of the black charged particles 50 are cross-linked polymer particles obtained by adding a cross-linking agent while polymerizing monomers.
  • the method for producing the crosslinked polymer particles includes a polymer particle production step of producing a polymerized dimple particle by adding a crosslinking agent while polymerizing a monomer, and a dyeing process in which the produced polymer particle is dyed via a dye or the like. Process.
  • polymer particles produced by this polymerization reaction are separated from the dispersion medium and dried, polymer particles having a plurality of dimples on the surface as shown in FIG. 2 are obtained.
  • the polymer particles had an average particle size of 4.9 / ⁇ ⁇ and a dispersity of 1.05.
  • the particle size of the polymer particles at the time when the cross-linking agent is added there is a mutual relationship between the particle size of the polymer particles at the time when the cross-linking agent is added and the amount of the cross-linking agent added.
  • the particle size of the polymer particles at the time of adding the cross-linking agent is small, it is difficult to form dimples on the polymer particles unless the addition amount of the cross-linking agent to be added is increased.
  • the particle size of the polymer particles at the time when the cross-linking agent is added is large, dimples are easily formed on the polymer particles even if the amount of the cross-linking agent added is small.
  • the polymer particles at the time of adding the cross-linking agent when the particle size of the polymer particles at the time of adding the cross-linking agent is in the range of 3 to 6 ⁇ m, the polymer particles can be added by adding 1% or more of the cross-linking agent with respect to the charged amount of monomer. Dimples can be formed on the substrate.
  • the cross-linking material is desirably added at 2% or more, more desirably 3% or more.
  • the addition amount of the crosslinking agent is preferably added in an amount of 8% to 1% with respect to the charged amount of the monomer.
  • the particle size of the polymer particles is in the range of 1 to: LO / zm, it is preferable to add 10% to 0.1% of a crosslinking agent.
  • the crosslinking agent that can be used in this example is not limited to divinylbenzene, and various compounds shown below can be used as the crosslinking agent. For example, aromatic divinyl compounds and carboxylic acid esters having two or more vinyl groups can be used.
  • Aromatic dibule compounds include dibulalnaphthalene, N, N dibularin and their derivatives.
  • carboxylic acid ester having two or more vinyl groups polyethylene glycol dimethacrylate Tatari, polyethylene glycol di Atari rate, Toryechi glycol dimethacrylate, triethylene glycol di Atari rate, 1, 3 Buchiren glycol dimethacrylate Tatari rate, 1 , 3 Butylene glycol diatalylate, 1,6 hexylene glycol dimetatalate, 1, 6 hexylene glycol diatalate, neopentyl glycol dimetatalylate, neoventil glycol ditalariate, dipropylene glycol dimetatalate , Dipropylene glycol diatalylate, polypropylene glycol dimethacrylate, polypropylene glycol diathalate, 2, 2 bis (4-methacryloxydiethoxyphenol) Bread, 2, 2 bis (4-atarioxydiethoxyphenol) propane, trimethylol
  • the white charged particle 60 is a particle in which a large number of child particles 62 having a diameter smaller than that of the mother particle 61 are combined with a spherical mother particle 61. And the surface is convex.
  • the mother particle 61 is formed of a chargeable material, and for example, acrylic resin is used. Examples of this acrylic resin include polyacrylic acid and esters thereof.
  • acrylic resin polycarbonate
  • HDPE high density polyethylene
  • PP polypropylene
  • ABS acrylonitrile butadiene styrene
  • PET polyethylene terephthalate
  • POM polyacetal
  • the child particle 62 is mechanically coupled in a state where a part of the child particle 62 is buried in the surface of the mother particle 61.
  • the child particles 62 increase the resistance received from the display liquid 40 when the white charged particles 60 move the display liquid 40. Therefore, it is possible to reduce the straightness in the movement of the white charged particles 60 contrary to the black charged particles 50.
  • the child particle 62 is mechanically bonded to the surface of the mother particle 61 by a hybridization method. Specifically, the child particle 62 is bonded to the surface of the mother particle 61 in a state where a part of the child particle 62 is buried.
  • the treatment method of this hybridization method is as follows.
  • the processing equipment used was the Nobbridation System (NHS) manufactured by Nara Machinery Co., Ltd.
  • NHS is a mixer that forms a mixture of powders, a hybridizer that combines fine powders in a dry manner, a collector, a control panel that controls each device, and an operation for operating the device. And a board.
  • the child particles 62 may be mechanically bonded to the surface of the mother particle 61 by a hybridization method. Further, a plurality of convex shapes may be formed by covering the surface of the mother particle 61. Furthermore, a plurality of convex shapes may be formed by processing the surface shape of the mother particle 61.
  • an electric field is generated in the display unit 30 with the display electrode layer 12 minus and the back electrode layer 22 plus.
  • the positively charged black charged particles 50 move to the display substrate 10 side and adhere to the display electrode layer 12.
  • the white charged particles 60 move to the back substrate 20 side and adhere to the back electrode layer 22.
  • black is displayed on the display substrate 10.
  • all of the black charged particles 50 are gathered together in the center of the display electrode layer 12 to form a black charged particle layer consisting of one layer in a close-packed state.
  • the close-packed means that the adjacent black charged particles 50 are in contact with each other.
  • a gap is formed on both sides of the black charged particle layer so that at least one white charged particle 60 can be disposed.
  • the distance between the gaps may be adjusted according to the particle diameter and the number of particles of the black charged particles 50 and the white charged particles 60, the distance between the spacer 31 and the partition wall 32, the distance between the partition wall 32 and the partition wall 32, and the like.
  • the black charged particles 50 are displayed as shown in FIG.
  • the white charged particles 60 are separated from the back electrode layer 22 away from the electrode layer 12.
  • the black charged particles 50 having high straightness move toward the back electrode layer 22 without substantially destroying the arrangement.
  • the white charged particles 60 that are easily subjected to the resistance of the display liquid 40 are pushed toward the back substrate 20 by the flow of the display liquid 40 accompanying the movement of the black charged particles 50.
  • the white charged particles 60 are divided into two groups at the center and move so as to wrap around the gaps on both sides of the black charged particles 50 aligned in a row.
  • the closer the black charged particles 50 are to the white charged particles 60 the more the white charged particles 60 are pushed away by the display liquid 40 and move away from the black charged particles 50.
  • the collision between the black charged particles 50 and the white charged particles 60 can be avoided.
  • the black charged particle layer moves straight in the display liquid 40. From this, since the gaps on both sides of the black charged particle layer are maintained, collision between different particles can be avoided.
  • the black charged particles 50 move toward the back electrode layer 22.
  • the white charged particles 60 move toward the display electrode layer 12 while wrapping around the black charged particles 50.
  • the arrangement of the black charged particles 50 and the arrangement of the white charged particles 60 are reversed and switched.
  • the black charged particles 50 adhere to the back electrode layer 22 as they are in a line.
  • the white charged particles 60 also adhere to the display electrode layer 12 in a state of being arranged in a line. At this time, white is displayed on the display substrate 10. In this way, collisions between particles can be avoided by using two types of particles that are different from each other. Further, since the time required for switching between the black charged particles 50 and the white charged particles 60 can be shortened, the display switching response of the display panel 2 can be improved.
  • the test method will be described.
  • an experimental cell 500 having the same configuration as that of the display panel 2 was used.
  • the cell 500 includes a first substrate 100 and a second substrate 200.
  • a display unit 300 formed with a spacer 310 interposed is provided in the display unit 300.
  • the display liquid 400 is sealed.
  • the first substrate 100 includes a display layer 110 and a first electrode layer 120 provided on the inner surface of the display layer 11 (the surface facing the display unit 300). It is.
  • the second substrate 200 includes a housing support layer 210 and a second electrode layer 220 provided on the inner surface of the housing support layer 210 (the surface facing the display unit 300).
  • the distance between the first substrate 100 and the second substrate 200 was lcm. Furthermore, 0.1 wt. / c ⁇ Test particle 80 was charged and test particle 80 was negatively charged.
  • the first electrode layer 120 of the cell 500 is connected to the ground 71 via a wiring.
  • the second electrode layer 220 is connected to the switch 72 via a wiring.
  • the switch 72 is connected to the positive side of the 200V DC power source 73.
  • the negative side of the DC power supply 73 is connected to the ground 74 through wiring.
  • the amount of movement of the test particles 80 after 5 seconds from applying an electric field to the display liquid 400 was observed with a microscope.
  • the amount of movement of the test particles 80 was selected from a number of test particles 80 dispersed in the display liquid, and the amount of movement of the test particles 80 was measured by image analysis using a PC (personal computer). .
  • image analysis based on the amount of movement of the test particle 80, the amount of movement in the X direction and the amount of movement in the y direction, which will be described later, were obtained, and xZy indicating straightness (T) was calculated. Then, the straightness of the three types of test particles 80 was compared. Three types of test particles 80 were prepared: 1.
  • the convex particles 82 correspond to the white charged particles 60 (see FIG. 3) of the present embodiment.
  • the dimple particles 83 correspond to the black charged particles 50 (see FIG. 2) in the present embodiment.
  • These three kinds of test particles 80 all have the same diameter. Furthermore, the diameter of the convex particles was based on the diameter of the mother particles.
  • straightness in this test is the shortest distance between the first substrate 100 and the second substrate 200 when the test particles 80 move between the first substrate 100 and the second substrate 200.
  • the ratio of the amount of movement in the direction of the shortest distance to the amount of movement in the direction perpendicular to the direction of distance shall be indicated.
  • the thickness direction of the cell 500 direction of force from the first substrate 100 to the second substrate 200
  • the direction perpendicular to the thickness direction was taken as the y direction.
  • the amount of movement of convex particles 82 in the X direction was 3.0 (X 10 _2 mm), and the amount of movement in the y direction was 22.0 (X 10 " 2 mm).
  • the amount of movement of the conventional spherical particles 81 in the X direction was 6.3 (X 10 " 2 mm), and the amount of movement in the y direction was 5.3 (X 10 _2 mm).
  • the amount of movement of the dimple particle 83 in the x direction was 20.3 (X 10 _2 mm), and the amount of movement in the y direction was 2.8 (X 10 _2 mm).
  • the spherical particles 81 having the conventional shape move to the second substrate 200 side while receiving the resistance of the display liquid 400. Therefore, not only the amount of movement in the X direction but also the amount of movement in the y direction occurs.
  • the movement amount in the y direction of the convex particle 82 is higher than the movement amount in the X direction. This is presumed that the straightness was greatly reduced because the large number of child particles 62 bonded to the surface of the mother particle 61 was strongly subjected to the resistance of the display liquid 400.
  • the dimple particle 83 has a much higher amount of movement in the X direction than that in the y direction. This is presumably because the display liquid 400 smoothly circulates behind the particles due to a large number of dimples provided on the particle surface, so that the resistance of the display liquid 400 is reduced and the straightness is improved.
  • test particles 1 and 2 are particles corresponding to the black charged particles 50 and the white charged particles 60 of the present embodiment.
  • the test particles 1 were adjusted to white and the test particles 2 were adjusted to black so that the charging polarities were different from each other.
  • three types were prepared: 1. spherical particles (standard), 2. convex particles, and 3. dimple particles. These three kinds of particles are combined as test particles 1 and 2, respectively. 1. Spherical particles Spherical particles 2. Spherical particles Dimple particles 3. Spherical particles-Convex particles 4. Convex particles Dimple particles 5.
  • Convex particles -6 types of combinations were set: convex particles and 6. dimple particles and dimple particles. Then, according to these combinations, a plurality of test particles 1 and 2 were put into the display liquid 40, and the time required for display switching in the display panel 2 was measured. In this test, the time required to switch the white display power to black display was also measured.
  • test result will be considered.
  • the conventional spherical particle combination of spherical particles had a display switching time of 70 (msec), while the combination of spherical particles and dimple particles shortened the display switching time to 40 (msec).
  • test particle 2 which is a dimple particle has improved straightness compared to spherical test particle 1, and a difference has occurred between the straightness of test particle 1 and test particle 1.
  • the rectilinearity of the test particles 1 and the rectilinearity of the test particles 2 are different from each other, thereby reducing the collision frequency and shortening the display switching time.
  • the shape of test particle 1 and the shape of test particle 2 are different from each other, so that the straightness of test particle 1 and the straightness of test particle 2 are different from each other. Therefore, it is considered that collision between particles was avoided and display switching time was shortened. However, since the moving speed of each particle is slower than the dimple particle which is not the dimple particle, the display switching time is estimated to be longer than the combination of the spherical particle and the dimple particle.
  • the combination of convex particles and dimple particles was the shortest of 30 (msec), and the display switching time was further shortened compared to the combination of spherical particles and dimple particles. This is because the convex particles receive the resistance of the display liquid more strongly than the spherical particles, so they move quickly with respect to the dimple particles moving straight, and more reliably avoid collision with the dimple particles. It is guessed. On the other hand, in the combination of convex particles and convex particles, the surface shape is easy to receive the resistance of the display liquid, so the time required for movement between the substrates becomes longer. Spherical particles It is estimated that the display switching time is longer than the combination of spherical particles.
  • both the surface shapes of the dimple particles with high straightness and force straightness are the same, so the collision frequency is higher and the display switching time is longer. Presumed to be Natsuta. From the above, the display switching time of the display panel 2 can be shortened the most by making the combination of the particle shapes a combination of convex particles and dimple particles.
  • the display panel 2 of the present embodiment uses the black charged particles 50 and the white charged particles 60 having different surface shapes.
  • the straightness of the black charged particles 50 and the straightness of the white charged particles 60 can be made different from each other, so that collision between these particles can be avoided.
  • the black charged particles 50 are dimple particles having a large number of dimples 51 on the surface
  • the white charged particles 60 are convex particles having a large number of child particles 62 on the surface. Accordingly, the straightness of the black charged particles 50 is improved, and the white charged particles 60 are strongly subjected to the resistance of the display liquid 40, so that the straightness is lowered.
  • the black charged particles 50 move between the display substrate 10 and the back substrate 20 with the shortest distance, and the white charged particles 60 move so as to avoid the black charged particles 50. Therefore, collision between the black charged particles 50 and the white charged particles 60 can be effectively avoided. And since the display switching time of the display panel 2 is shortened, the responsiveness of display switching can be improved.
  • the electrophoretic display medium according to the present disclosure is not limited to the above-described embodiment, and various modifications are possible.
  • the surface area of the display electrode layer 12 and the surface area of the back electrode layer 22 are the same as each other. By making the surface areas different from each other, collisions between charged particles can be avoided more reliably. . Therefore, as a modification of the above embodiment, a display panel 600 in which the surface area of the display electrode layer and the surface area of the back electrode layer are different from each other will be described with reference to FIGS. Note that the same components as those of the display panel 2 of the above embodiment are denoted by the same reference numerals and description thereof is omitted.
  • the display panel 600 has a configuration similar to that of the display panel 2.
  • the back substrate 90 different from the back substrate 20 of the above embodiment is provided.
  • the back substrate 90 includes a housing support layer 91, and a back electrode layer 92 is provided at the center of the top surface of the housing support layer 91.
  • the back electrode layer 92 has a smaller surface area than the display electrode layer 12.
  • the panel 600 is provided on the upper surface of the housing support layer 91 with a gap between both sides.
  • the display liquid 40, the black charged particles 50, and the white charged particles 60 are the same as those in the above embodiment.
  • the black charged particles 50 are “dimple particles”, and the white charged particles 60 are “convex particles”.
  • FIGS. 13 to 16 the particle diameter, the number of particles, and the like are changed in order to clearly explain the movement of the black charged particles 50 and the white charged particles 60.
  • the positively charged black charged particles 50 are added to the display substrate 10. And adheres to the display electrode layer 12 in a line.
  • the white charged particles 60 move to the back substrate 20 side and adhere to the back electrode layer 92.
  • the back electrode layer 92 is disposed at the center of the back substrate 90, the plurality of white charged particles 60 are folded in a dump shape and attached to the back electrode layer 92. At this time, black is displayed on the display substrate 10.
  • the black charged particles 50 are converted into the display electrode layer.
  • the white charged particles 60 are separated from the back electrode layer 92.
  • the black charged particles 50 having high straightness move straightly by directing the back electrode layer 92. Therefore, the black charged particles 50 move so that the arrangement thereof collapses and gathers in the center of the display unit 30.
  • the white charged particles 60 that are easily subjected to the resistance of the display liquid 40 are pushed by the flow of the display liquid 40 as the black charged particles 50 move. Therefore, the plurality of white charged particles 60 are divided into two aggregates at the center, and move while wrapping around both sides of the black charged particles 50 assembled at the center.
  • the arrangement of the black charged particles 50 and the white charged particles 60 is reversed and reversed.
  • the black charged particles 50 adhere to the back electrode layer 92 in a bunched state, and the white charged particles 60 adhere to the display electrode layer 12 in a row.
  • white is displayed on the display substrate 10.
  • the black charged particles 50 gather from the display electrode layer 12 while gathering at the center of the display liquid 40. It moves toward the back electrode layer 92.
  • a large gap is formed between the black charged particles 50 adhering to the back electrode layer 92 and the spacers 31 or the partition walls 32.
  • the white charged particles 60 can pass through the gap with a margin, it is possible to more reliably avoid the black charged particles 50 and the white charged particles 60 from colliding with each other. Further, since the surface area of the back electrode layer 92 is made smaller than the surface area of the display electrode layer 12, the display area of the color displayed on the display substrate 10 cannot be reduced.
  • the white charged particles 60 may be dimple particles and the black charged particles 50 may be convex particles.
  • the display electrode layer 12 and the back electrode layer 22 are provided on the display substrate 10 and the back substrate 20, respectively.
  • these electrodes (the display electrode layer 12 and the back electrode) With the layer 22), it can also be applied to display panels.
  • the first charged particles are arranged on one substrate side according to their own charge polarity.
  • the second charged particles move to the other substrate side according to their charge polarity.
  • the ratio of the amount of movement in the direction of the shortest distance to the amount of movement of the first charged particles in the direction perpendicular to the direction of the shortest distance between the pair of substrates when the first charged particles move between the pair of substrates is shown.
  • the second charged particles which indicate the ratio of the amount of movement in the direction, are different from the straightness of the second charged particles, so the charged particles with lower straightness and the higher charged particles should move so as to avoid movement of the charged particles with higher straightness. To do. This is because the charged particle force with the lower straightness is more resistant to the peripheral force than the charged particle with the higher straightness. In other words, the charged particles with the lower straightness receive the flow of the charged particles with the higher straightness as resistance, and move so as to avoid the resistance. Therefore, the first charged particles and the second charged particles can be effectively prevented from colliding with each other. And since the movement time of the 1st charged particle and the 2nd charged particle can be shortened, the time required for display switching can be shortened.
  • the resistance to the flow of the display liquid can be made different from each other.
  • the straightness of the first charged particles and the straightness of the second charged particles can be made different from each other.
  • the surface shape of the first charged particles has a dimple structure. Therefore, straightness can be improved like a golf ball with dimples. That is, the display liquid smoothly flows behind the first charged particles by the dimples, so that the resistance due to the display liquid is reduced and the straightness can be improved. Accordingly, the straight traveling property of the first charged particles can be made higher than the straight traveling property of the second charged particles, so that the first charged particles and the second charged particles can be effectively prevented from colliding with each other.
  • the first charged particles are cross-linked polymer particles obtained chemically by polymerizing a monomer. Therefore, since a plurality of concave portions can be formed on the surface of the particle, a dimple structure can be easily formed.
  • the surface shape of the second charged particles is a convex shape. Accordingly, since the resistance to the flow of the display liquid can be increased, the straightness of the second charged particles can be made lower than the straightness of the first charged particles. In addition, since the straightness of the second charged particles decreases, the second charged particles move so as to avoid the movement of the first charged particles. As a result, the probability that the first charged particles and the second charged particles collide with each other can be lowered, so that the moving time of the first charged particles and the second charged particles can be shortened.
  • the resistance of the display liquid to the second charged particles can be easily increased by the child particles bonded to the mother particles of the second charged particles. This makes it possible to form second charged particles having straightness lower than that of the first charged particles.
  • the child particles are physically and firmly bonded to the surface of the mother particle by the hybridization method, the child particles are separated from the surface of the mother particle in the display liquid. It will not peel off.
  • one charged particle attached to the first electrode moves so as to converge toward the second electrode having a surface area smaller than the surface area of the first electrode.
  • the other charged particles adhering to the second electrode move so as to diffuse toward the first electrode. Move.
  • the other charged particle moves to the first electrode while diffusing outward to escape one charged particle force.
  • the second charged particles when the first charged particles are most densely arranged in one layer and moved from one substrate cover to the other substrate side, the second charged particles are It can pass through the gap between the first charged particle and the spacer located at the end. Thereby, the probability that the first charged particles and the second charged particles collide with each other can be effectively reduced.
  • the electrophoretic display medium of the present disclosure can be applied to various electronic devices including a display unit.

Abstract

L'invention concerne un panneau d'affichage (2) dans lequel les configurations superficielles des particules chargées noires (50) et des particules chargées blanches (60) sont différentes les unes des autres. Les particules chargées noires (50) sont des particules à bosses dotées d'une multiplicité de bosses sur la surface de la particule, présentant ainsi une capacité de marche avant élevée. D'autre part, les particules chargées blanches (60) sont des particules saillantes dotées d'une multiplicité de particules ramifiées sur la surface de la particule, présentant ainsi une faible capacité de marche avant. En conséquence, tandis que les particules chargées noires (50) réalisent une migration sur la distance la plus courte entre le substrat d'affichage (10) et le substrat côté verso (20), les particules chargées blanches (60) migrent en s'écartant des particules chargées noires (50). C'est la raison pour laquelle, comme on peut éviter toute collision des particules chargées noires (50) avec les particules chargées blanches (60), on peut améliorer les performances de réponse de commutation d'affichage.
PCT/JP2007/063077 2006-08-25 2007-06-29 support d'affichage électrophorétique WO2008023498A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2006-228836 2006-08-25
JP2006228836A JP2008052084A (ja) 2006-08-25 2006-08-25 電気泳動表示媒体

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WO2008023498A1 true WO2008023498A1 (fr) 2008-02-28

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PCT/JP2007/063077 WO2008023498A1 (fr) 2006-08-25 2007-06-29 support d'affichage électrophorétique

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JP (1) JP2008052084A (fr)
WO (1) WO2008023498A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5099217B2 (ja) * 2008-09-12 2012-12-19 コニカミノルタビジネステクノロジーズ株式会社 画像表示装置用表示粒子および画像表示装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08174896A (ja) * 1994-12-20 1996-07-09 Brother Ind Ltd 画像形成装置
WO2004090626A1 (fr) * 2003-04-02 2004-10-21 Bridgestone Corporation Particule utilisee pour un support d'affichage d'image, panneau d'affichage d'image et affichage d'image
JP2005000647A (ja) * 2003-06-09 2005-01-06 Taylor Made Golf Co Inc ペプタイザを含むゴルフボールおよびその製造方法
JP2006077609A (ja) * 2004-09-07 2006-03-23 Kanto Auto Works Ltd 自動車のマフラー構造
JP2006146191A (ja) * 2004-10-22 2006-06-08 Canon Inc 粒子移動型表示装置用粒子及びその製造方法、表示装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08174896A (ja) * 1994-12-20 1996-07-09 Brother Ind Ltd 画像形成装置
WO2004090626A1 (fr) * 2003-04-02 2004-10-21 Bridgestone Corporation Particule utilisee pour un support d'affichage d'image, panneau d'affichage d'image et affichage d'image
JP2005000647A (ja) * 2003-06-09 2005-01-06 Taylor Made Golf Co Inc ペプタイザを含むゴルフボールおよびその製造方法
JP2006077609A (ja) * 2004-09-07 2006-03-23 Kanto Auto Works Ltd 自動車のマフラー構造
JP2006146191A (ja) * 2004-10-22 2006-06-08 Canon Inc 粒子移動型表示装置用粒子及びその製造方法、表示装置

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