CN107367835A - A kind of electric moistening display and preparation method thereof - Google Patents
A kind of electric moistening display and preparation method thereof Download PDFInfo
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- CN107367835A CN107367835A CN201710686589.9A CN201710686589A CN107367835A CN 107367835 A CN107367835 A CN 107367835A CN 201710686589 A CN201710686589 A CN 201710686589A CN 107367835 A CN107367835 A CN 107367835A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- 239000002245 particle Substances 0.000 claims abstract description 91
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- 239000012530 fluid Substances 0.000 claims abstract description 37
- 238000000034 method Methods 0.000 claims abstract description 20
- 239000007788 liquid Substances 0.000 claims description 18
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 13
- 230000002209 hydrophobic effect Effects 0.000 claims description 11
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 10
- 229910017052 cobalt Inorganic materials 0.000 claims description 10
- 239000010941 cobalt Substances 0.000 claims description 10
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 10
- 229910044991 metal oxide Inorganic materials 0.000 claims description 8
- 150000004706 metal oxides Chemical class 0.000 claims description 8
- 239000000956 alloy Substances 0.000 claims description 7
- 239000000758 substrate Substances 0.000 claims description 7
- 229910045601 alloy Inorganic materials 0.000 claims description 6
- 229910052742 iron Inorganic materials 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 6
- 229910000428 cobalt oxide Inorganic materials 0.000 claims description 5
- 239000000696 magnetic material Substances 0.000 claims description 5
- 229910052759 nickel Inorganic materials 0.000 claims description 5
- 229910000480 nickel oxide Inorganic materials 0.000 claims description 5
- GNRSAWUEBMWBQH-UHFFFAOYSA-N oxonickel Chemical compound [Ni]=O GNRSAWUEBMWBQH-UHFFFAOYSA-N 0.000 claims description 5
- 230000010148 water-pollination Effects 0.000 claims description 5
- 238000000926 separation method Methods 0.000 claims description 4
- 238000011049 filling Methods 0.000 claims description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 3
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- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 229920002120 photoresistant polymer Polymers 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- DCAYPVUWAIABOU-UHFFFAOYSA-N hexadecane Chemical compound CCCCCCCCCCCCCCCC DCAYPVUWAIABOU-UHFFFAOYSA-N 0.000 description 4
- 239000004570 mortar (masonry) Substances 0.000 description 4
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- 229910000952 Be alloy Inorganic materials 0.000 description 3
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- 239000004205 dimethyl polysiloxane Substances 0.000 description 1
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- 150000002466 imines Chemical class 0.000 description 1
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 229920001206 natural gum Polymers 0.000 description 1
- CXQXSVUQTKDNFP-UHFFFAOYSA-N octamethyltrisiloxane Chemical compound C[Si](C)(C)O[Si](C)(C)O[Si](C)(C)C CXQXSVUQTKDNFP-UHFFFAOYSA-N 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
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- -1 titanate ester Chemical class 0.000 description 1
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- 238000001291 vacuum drying Methods 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/004—Optical devices or arrangements for the control of light using movable or deformable optical elements based on a displacement or a deformation of a fluid
- G02B26/005—Optical devices or arrangements for the control of light using movable or deformable optical elements based on a displacement or a deformation of a fluid based on electrowetting
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)
Abstract
The invention discloses a kind of electric moistening display and preparation method thereof, magnetic retention particle is added in fluid is filled, during voltage is applied, conductive fluid driving ink motion, oil film thinnest part determines the breakdown point and the direction of motion of oil film, and the thinner required pixel openings voltage of oil film is lower, the present invention is introduced into magnetic retention particle in pixel wall can change the thickness distribution of oil film in pixel wall, so as to reach the beneficial effect of the control ink direction of motion.The preparation method technique of the present invention is simple, it is easy to accomplish, the electric moistening display being prepared can efficiently control the ink direction of motion.
Description
Technical field
The present invention relates to display technology field, more particularly to a kind of electric moistening display and preparation method thereof.
Background technology
Electrowetting shows that (Electro-wetting Display, EWD) is come in control display unit using extra electric field
Polar liquid surface tension, and then control the contraction of ink and sprawl, so as to realize the controllability of optical switch.Obtain good
Color rendering effect, just must to ink rupture position and the direction of motion reliably be controlled.
Existing ink movement control mode has two kinds：A kind of is by one jiao of formation drive electrode layer in pixel cell
The local cavity or defect of (such as ITO), using the local uneven of extra electric field, realize that ink motion is contracted to the one of pixel
Angle, due to preferentially being ruptured in ink thickness thinnest part, ink, it is most thin that the threshold voltage needed for ink rupture depends on ink
The thickness at place, thus the local defect formed can control the position of the contraction terminal of ink, but can not effectively control ink
Breakdown point, and during manufacturing defect is performed etching (such as conventional ito glass) to conductive backings, easily occur not advising
Jagged edge then, when applying voltage driving, electric charge can be intended to gather irregular edge, form local high electric charge
Density, it is very easy to cause insulating barrier to puncture, destroys device, reduces the service life of device；Another kind is hydrophilic using two kinds
Property different photoresist make pixel wall, make thickness of the ink in more hydrophilic side thinner, change the position of ink rupture,
So as to control the ink direction of motion, but because position that ink finally shrinks is probably in opposite side pixel wall in two corners
Any one, therefore the position that uncontrollable ink finally shrinks in this way, and with two kinds of different hydrophilics
Photoresist, using the method for secondary photoetching, require very high for alignment precision, carry out dry etching twice easily to bottom
Insulating barrier causes to damage.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of electric moistening display part and preparation method thereof, it is intended to solve
The uncontrollable problem of the ink direction of motion in display device pixel compartments.
The technical solution used in the present invention is：
The present invention provides a kind of electric moistening display, including the upper substrate and infrabasal plate being oppositely arranged, the upper substrate and
The infrabasal plate is encapsulated to form a closed chamber, and immiscible first fluid and second fluid are filled with the closed chamber,
The infrabasal plate includes lower electrically-conductive backing plate, hydrophobic dielectric layer and the pixel wall set gradually, and the pixel wall surrounds multiple pixels
Lattice, each pixel compartments are interior to be filled with first fluid and magnetic retention particle.
Preferably, first fluid is nonpolar liquid, and second fluid is electrolytic liquid.First fluid is and second fluid
Immiscible nonpolar liquid, such as the mixture of hexadecane, silicone oil or both.First fluid absorbs at least a portion spectrum,
Can be transmission for a part of spectrum, so as to form color filter.Preferably, the range of viscosities 5 of first fluid 5~
30cps, surface tension range are 15~45mN/cm.Second fluid is electrolytic liquid, as polar solvent, ionic liquid, salt are molten
Liquid etc., second fluid can be the absorption of transparent, black or colour or reflexive liquid, preferably transparent absorption or anti-
The liquid of penetrating property.
Preferably, the magnetic retention particle is ferromagnetism or antiferromagnetic materials.
Preferably, the surface wettability of the magnetic retention particle is rendered as lipophile or hydrophily, the magnetic retention
The contact angle of particle surface water<70 ° or>110°.Hydrophily, warp is presented by hydrophilic modifying in the surface of the magnetic retention particle
Cross hydrophobically modified and lipophile is presented.
Preferably, the magnetic retention particle be shaped as it is spherical.
Preferably, the magnetic retention particle is alloy or metal oxide, the alloy be containing in iron, cobalt, nickel extremely
A kind of few magnetic material, the metal oxide are at least one of ferriferous oxide, cobalt/cobalt oxide, nickel oxide.
Preferably, the particle diameter of the magnetic retention particle is 1~100 μm.
Preferably, the relative permeability of the magnetic retention particle is 200~200000.
The present invention also provides a kind of preparation method of above-mentioned electric moistening display, including magnetic retention is filled into pixel compartments
The step of particle.
Preferably, the specific steps of magnetic retention particle are filled into pixel compartments to be included：By the magnetic retention particle point
It is dispersed in the first fluid, the magnetic retention particle and the first fluid is filled into the pixel compartments simultaneously.
Further, it is to use the magnetic retention particle and the first fluid to be filled into the pixel compartments simultaneously
Enter vertically into any of formula completion method, ink-jet printing process, liquid separation completion method, slot coated method, interface self-assembly method.
Preferably, the step being fixed on the magnetic retention particle also using externally-applied magnetic field in pixel compartments.In magnetic
Property solid particle be filled into pixel compartments and after upper substrate and infrabasal plate complete encapsulation, magnetic retention is made by externally-applied magnetic field
Particle is mobile and is fixed on the ad-hoc location in pixel compartments, can be the centre or corner of pixel compartments, remove additional magnetic afterwards
, due to the ink of filling and the surface tension effects of conducting liquid, magnetic retention particle is able to maintain that original ad-hoc location.
The beneficial effects of the invention are as follows：
The present invention adds magnetic retention for the uncontrollable problem of the ink direction of motion in the prior art in fluid is filled
Particle, during voltage is applied, conductive fluid driving ink motion, oil film thinnest part determine oil film breakdown point and
The direction of motion, and the thinner required pixel openings voltage of oil film is lower, the present invention introduces magnetic retention particle in pixel wall
The thickness distribution of oil film in pixel wall can be changed, so as to reach the beneficial effect of the control ink direction of motion.The system of the present invention
Preparation Method technique is simple, it is easy to accomplish, the electric moistening display being prepared can efficiently control the ink direction of motion.
Brief description of the drawings
Fig. 1 is the structural representation of electric moistening display；
Fig. 2 is that the magnetic retention particle of different-grain diameter changes the design sketch of oil film thickness；
Fig. 3 is that the magnetic retention particle of different-grain diameter changes the optical microscope of oil film thickness；
Fig. 4 is the preparation technology flow chart of electric moistening display.
Embodiment
Carried out below with reference to the design of embodiment and accompanying drawing to the present invention, concrete structure and caused technique effect clear
Chu, it is fully described by, to be completely understood by the purpose of the present invention, feature and effect.Obviously, described embodiment is this hair
Bright part of the embodiment, rather than whole embodiments, based on embodiments of the invention, those skilled in the art is not paying
The other embodiment obtained on the premise of creative work, belongs to the scope of protection of the invention.
Embodiment 1
The present invention provides a kind of electric moistening display, and its structural representation is as shown in figure 1, the upper substrate including being oppositely arranged
9 and infrabasal plate 10, the infrabasal plate 10 includes lower electrically-conductive backing plate 1, hydrophobic dielectric layer 2 and the pixel wall 3 set gradually, the picture
Plain wall 3 surrounds multiple pixel compartments, and first fluid 4 and magnetic retention particle 6, the He of upper substrate 9 are filled with the pixel compartments
The infrabasal plate 10 is encapsulated by glue material 8 and forms a closed chamber 7, filled with immiscible first-class in the closed chamber 7
Body 4 and second fluid 5.
The magnetic retention particle of different-grain diameter changes the design sketch of oil film thickness as shown in Fig. 2 the He of magnetic retention particle 61
Magnetic retention particle 62 is identical (the contact angle θ of surface wettability1=θ2) different-grain diameter magnetic retention particle, with magnetic
The increase of the particle diameter of solid particle, the oil film of magnetic retention particle position ink are gradually thickening.Referring to Fig. 3, Fig. 3 (a), figure
3 (b) and Fig. 3 (c) are to change the optical microscope of oil film thickness, Fig. 3 (d), Fig. 3 (e) compared with the magnetic retention particle of small particle
Change the electron microscope of oil film thickness for the magnetic retention particle of greater particle size with Fig. 3 (f), the particle diameter of magnetic retention particle is smaller
When, the oil film positioned at magnetic retention particle side is relatively thin, and upon application of a voltage, ink is towards opposite with magnetic retention particle one
Lateral movement, when the particle diameter of magnetic retention particle is larger, the ink positioned at magnetic retention particle side is thicker, upon application of a voltage,
Ink towards with the lateral movement of magnetic retention particle identical one, due to oil film thinnest part determine oil film breakdown point and motion side
To, thus by controlling the particle diameter of magnetic retention particle to be controlled to the direction of ink contractile motion.
The present invention also provides a kind of preparation method of above-mentioned electric moistening display, and preparation technology flow is as shown in Figure 4.Under
Hydrophobic dielectric layer 2 is prepared on electrically-conductive backing plate 1, preparation method can be but not limited to spin coating, roller coating, silk-screen printing, dip-coating, spray
Painting, blade coating, slot coated etc., hydrophobic dielectric layer 2 can be the Cytop of AF1600, AF1600X or AGC company of E.I.Du Pont Company
Or Solvay Plastics Hyflon etc., drying obtain hydrophobic dielectric layer 2, the thickness of dry film of hydrophobic dielectric layer 2 of formation is
200nm~800nm.
Pixel wall 3 is set on hydrophobic dielectric layer 2：Pixel wall is coated with hydrophobic dielectric layer 2 using one or multi-step method
Material layer 33, the coating method can be but not limited to spin coating, roller coating, silk-screen printing, dip-coating, spraying, blade coating, slot coated
Deng.Pixel wall material layer 33 selects SU-8 negative photoresists, and the thickness of dry film formed after drying is 1~50 μm, utilizes ultraviolet light
Pixel wall material layer 33 is exposed through mask plate, the mask plate has light transmission part 11 and lightproof part 12, mask
Plate is generally array structure, and to obtain having figuratum pixel wall 3, pixel wall 3 surrounds pixel compartments array, in order to increase hydrophobic Jie
The adhesiveness of electric layer 2 and pixel wall 3, pixel wall 3 is prepared again after plasma etching can be carried out to hydrophobic dielectric layer 2.To avoid
Black phenomenon is jumped in driving, and pixel wall 3 typically uses hydrophilic material, including light-sensitive material such as SU-8 negative photoresists, hydrophilic polyamides
Imines photoresist, or other hydrophilic materials such as PDMS, PET etc..
First fluid 4 and magnetic retention particle 6 are filled in pixel compartments：Invar alloy powders are taken, sequentially add ultra-pure water
Washed with absolute ethyl alcohol, be placed in after separation in vacuum drying chamber at 60 DEG C and dry 2h, then used agate mortar grind into powder, obtain
To magnetic retention particle 6, the particle diameter of magnetic retention particle 6 is 1~100 μm.The magnetic retention particle 6 of above-mentioned preparation is taken to be distributed to
Dispersion liquid is formed in first fluid 4, first fluid 4 is electrolytic liquid such as polar solvent, ionic liquid, salting liquid etc., is used
Enter vertically into formula completion method, ink-jet printing process, liquid separation completion method, slot coated method, interface self-assembly method or utilize such as CN
Ink pad device in 104932096A, above-mentioned dispersion liquid is filled into pixel compartments, second is then filled in pixel compartments
Fluid 5, second fluid 5 are the nonpolar liquid immiscible with first fluid 4, such as the mixture of hexadecane, silicone oil or both,
Second fluid absorbs at least a portion spectrum, can be transmission for a part of spectrum, so as to form color filter, preferably
Ground, 5~30cps of range of viscosities of second fluid 5, surface tension range is 15~45mN/cm.Glue material 8 is finally utilized by upper base
Plate 9, infrabasal plate 10 encapsulate, and form electric moistening display part, before applying voltage, by externally-applied magnetic field by magnetic retention particle
6 are fixed on the ad-hoc location in pixel compartments, can be the centre or corner of pixel compartments, remove externally-applied magnetic field afterwards, due to filling
First fluid 4 and second fluid 5 surface tension effects, magnetic retention particle 6 is able to maintain that initial ad-hoc location.
Magnetic retention particle is Invar alloying pellets in some embodiments of the present invention, the magnetic retention added in practice
Particle 6 can be alloy or metal oxide, and the alloy is the magnetic material containing at least one of iron, cobalt, nickel, the gold
Category oxide is at least one of ferriferous oxide, cobalt/cobalt oxide, nickel oxide, and the relative permeability of magnetic retention particle 6 is
200~200000, its shape is arbitrary, preferably regular spherical.
Embodiment 2
A kind of electric moistening display is present embodiments provided, its structure is substantially the same manner as Example 1, and difference is：
The magnetic retention particle is the Fe of surface oleophylic3O4Particle.Its preparation process is as follows：Coupling agent LD-139-2 is taken to be dissolved in second
In alcohol, the ethanol solution for the coupling agent LD-139-2 that volume fraction is 2% is configured to, 500mgFe is then added into solution3O4
Powder, it is placed on rolling mixer and stirs 12h, Magnetic Isolation goes out powder, adds absolute ethyl alcohol and is washed, is subsequently placed at vacuum
2h is dried in drying box at 60 DEG C, with agate mortar grind into powder, obtains lipophile magnetic retention particle.
Using chemical reagent hydrophilic or hydrophobically modified, modified magnetic retention particle can be carried out to magnetic retention particle
Surface wettability is rendered as hydrophily or lipophile, the contact angle of magnetic retention particle surface water<70 ° or>110 °, the change used
It can be titanate ester chemical modifier to learn reagent, such as TC-311 of day occasion chemical industry or the vertical LD-139-2 up to natural gum.When
For magnetic retention particle after hydrophilic modifying, the oil film positioned at magnetic retention particle side is relatively thin, when magnetic retention particle passes through
After hydrophobically modified, the oil film positioned at magnetic retention particle side is thicker, due to oil film thinnest part determine oil film breakdown point and
The direction of motion, thus by controlling the surface wettability of magnetic retention particle to be controlled to the direction of ink contractile motion
System.The present embodiment is with Fe3O4Exemplified by illustrate, the magnetic retention particle added in practice can be alloy or metal oxide,
The alloy is the magnetic material containing at least one of iron, cobalt, nickel, the metal oxide be ferriferous oxide, cobalt/cobalt oxide,
At least one of nickel oxide.Modified hydrophily or lipophile magnetic retention particle and first fluid are filled into pixel
In lattice, electric moistening display is obtained after sealed encapsulation.
Embodiment 3
A kind of electric moistening display is present embodiments provided, its structure is substantially the same manner as Example 1, and difference is：
The magnetic retention particle is the permalloy particle of surface hydrophilic.Its preparation process is as follows：1g permalloy powder is taken, is placed in
6h is calcined at 500 DEG C in Muffle furnace, is then cooled to room temperature in atmosphere, finally with agate mortar grind into powder, is obtained
Hydrophilic magnetic solid particle one.
The present embodiment illustrates by taking permalloy as an example, and the magnetic retention particle added in practice can be alloy or gold
Belong to oxide, the alloy be the magnetic material containing at least one of iron, cobalt, nickel, the metal oxide be ferriferous oxide,
At least one of cobalt/cobalt oxide, nickel oxide.Hydrophilic magnetic solid particle and the first liquid are filled into pixel compartments, warp
Electric moistening display is obtained after hermetically sealed.
Embodiment 4
A kind of electric moistening display is present embodiments provided, its structure is substantially the same manner as Example 1, and difference is：
The magnetic retention particle is the teleoseal particle of surface hydrophilic.Its preparation process is as follows：1g teleoseal powder is taken,
It is placed in Muffle furnace at 500 DEG C and calcines 6h, is then cooled to room temperature in atmosphere, finally with agate mortar grind into powder,
Obtain hydrophilic magnetic solid particle two.
Claims (10)
1. a kind of electric moistening display, including the upper substrate and infrabasal plate being oppositely arranged, the upper substrate and infrabasal plate envelope
Dress forms a closed chamber, and immiscible first fluid and second fluid, the infrabasal plate bag are filled with the closed chamber
The lower electrically-conductive backing plate set gradually, hydrophobic dielectric layer and pixel wall are included, the pixel wall surrounds multiple pixel compartments, and its feature exists
In each pixel compartments are interior to be filled with first fluid and magnetic retention particle.
2. electric moistening display according to claim 1, it is characterised in that the magnetic retention particle is ferromagnetism or anti-
Ferrimagnet.
3. electric moistening display according to claim 1, it is characterised in that the surface wettability of the magnetic retention particle
It is rendered as lipophile or hydrophily, the contact angle of the magnetic retention particle surface water>110 ° or<70°.
4. according to the electric moistening display described in claim any one of 1-3, it is characterised in that the magnetic retention particle is conjunction
Gold or metal oxide, the alloy are the magnetic material containing at least one of iron, cobalt, nickel, and the metal oxide is iron
At least one of oxide, cobalt/cobalt oxide, nickel oxide.
5. according to the electric moistening display described in claim any one of 1-3, it is characterised in that the grain of the magnetic retention particle
Footpath is 1~100 μm.
6. according to the electric moistening display described in claim any one of 1-3, it is characterised in that the phase of the magnetic retention particle
It is 200~200000 to magnetic conductivity.
7. the preparation method of the electric moistening display described in claim any one of 1-6, it is characterised in that including into pixel compartments
The step of filling magnetic retention particle.
8. the preparation method of electric moistening display according to claim 7, it is characterised in that magnetic is filled into pixel compartments
The specific steps of solid particle include：The magnetic retention particle is dispersed in the first fluid, by the magnetic retention
Particle is filled into the pixel compartments simultaneously with the first fluid.
9. the preparation method of electric moistening display according to claim 7, it is characterised in that by the magnetic retention particle
Be filled into simultaneously in the pixel compartments with the first fluid be using enter vertically into formula completion method, ink-jet printing process, liquid separation are filled out
Fill any of method, slot coated method, interface self-assembly method.
10. the preparation method of the electric moistening display according to claim 7, it is characterised in that also using additional magnetic
The magnetic retention particle is fixed on the step in pixel compartments by field.
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| CN201710686589.9A CN107367835B (en) | 2017-08-08 | 2017-08-08 | Electrowetting display and preparation method thereof |
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| CN201710686589.9A CN107367835B (en) | 2017-08-08 | 2017-08-08 | Electrowetting display and preparation method thereof |
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