CN207488614U - A kind of bistable electro soaks display device - Google Patents
A kind of bistable electro soaks display device Download PDFInfo
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- CN207488614U CN207488614U CN201721340373.9U CN201721340373U CN207488614U CN 207488614 U CN207488614 U CN 207488614U CN 201721340373 U CN201721340373 U CN 201721340373U CN 207488614 U CN207488614 U CN 207488614U
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- 229940021013 electrolyte solution Drugs 0.000 description 5
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Abstract
The utility model discloses a kind of bistable electros to soak display device.For the utility model by setting public electrode, the first region and second electrode area, the area ratio in the first region and second electrode area is more than 3；It is driven by multi-electrode and completes the high response speed state switching that bistable electro soaks display device, and power consumption is relatively low；A wetability isolation structures are provided on the insulating layer of each pixel compartments so that pixel compartments are divided into two regions, the contact angle of wetability isolation structures is 90 degree；By setting the wetability isolation structures that contact angle is 90 degree, the display device that aperture opening ratio is big, display effect is good is realized；The projection of wetability isolation structures on the electrically conductive is intersected with second electrode area；To provide the continuity electrowetting active force through wetability isolation structures to drop, it is ensured that drop crosses the energy barrier needed for wetability isolation structures.
Description
Technical field
The utility model is related to electrowetting display field, especially a kind of bistable electro wetting display device.
Background technology
It is a kind of display technology emerging in recent years that electrowetting, which is shown, has that reflectivity is good, contrast is high and temperature model
The characteristics of enclosing width.The principle that electrowetting is shown manipulates polar liquid surface tension or contact angle in pixel using extra electric field, into
And ink spreading and contraction are pushed, realize the Novel reflection-type display technology of optical switch and gray-scale Control.
Although current electrowetting display technology has been achieved for larger progress, but still need bistable state, wherein double
Stable state shows that only need energy maintains pixel status to switch pixel without energy.Therefore, bistable display technologies are wide
It is general to be applied to low-power consumption display field；Self-reflection type electrowetting display technology is born, for bistable electro wetting display technology
Exploration never stops.
2008, fortune of the advanced display technology Co., Ltd (ADT) of Germany using conductor fluid under electrode array drive
Dynamic characteristic proposes a kind of bistable electro wetting and shows structure (referring to bibliography [1]), and it is anti-to be successfully realized high contrast, height
The segment encode for penetrating rate is shown.However, effective vent rate (in contrast to the total geometric area) loss of dot structure design is serious, and
The speed of response for being limited to ink transverse shifting is low.
2010, a kind of double-deck stereo channel bistable electro wetting display structure of University of Cincinnati of U.S. proposition (referring to
Bibliography [2]), pass through harsh channel symmetry acquisition and the stability of holding fluid boundary form.By applying voltage
It controls the movement of fluid boundary and positioning, achievees the effect that multistable operates.The structure can realize faster response speed, and
It greatly improves electrowetting and shows reflectivity and aperture opening ratio.However, the structure must keep lower channel highly consistent, otherwise seriously
Influence the gray scale control effect of the display technology.Therefore cause precision of manufacturing process requirement excessively high, it is difficult to realize industrialization.
Bibliography [1]：Blankenbach,K.,Schmoll,A.,Bitman,A.,Bartels,F.,Jerosch,
D., Novel highly reflective and bistable electrowetting displays,Journal of
the SID,16, 237-244(2008).
Bibliography [2]：Yang S.,Zhou K.,Kreit E.,et al.,High reflectivity
electrowetting pixels with zero-power grayscale operation.,Applied physics
letters,2010, 97(14):143501.
Utility model content
In order to solve the above-mentioned technical problem, it is big, fast response time to be to provide a kind of aperture opening ratio for the purpose of this utility model
Bistable electro soaks display device.
Technical solution is used by the utility model：A kind of bistable electro soaks display device, including upper substrate under
Substrate, the upper substrate include first substrate and public electrode,
The lower substrate includes second substrate and the conductive layer being set in turn on the second substrate, insulating layer and surrounds
The pixel wall construction of pixel compartments array；
The conductive layer of each pixel compartments includes the first region, second electrode area and is set between the two electrodeless
The area ratio in area, the first region and second electrode area is more than 3；
A wetability isolation structures are provided with so that pixel compartments are divided into two regions on the insulating layer of each pixel compartments, it is described
The projection of wetability isolation structures on the electrically conductive is intersected with second electrode area；The contact angle of the wetability isolation structures is 90
Degree.
Further, the projection of the wetability isolation structures on the electrically conductive is intersected with the first region.
Further, the width range of the wetability isolation structures is 2-10 microns.
Further, the altitude range of the wetability isolation structures is 0.5-1 microns.
Further, the insulating layer is drain insulating layer.
Further, the shape in the electrodeless area is zigzag, shaped form or arc.
Further, the shape of the wetability isolation structures is rectangle.
Further, bistable electro wetting display device further includes sealing glue frame, the upper substrate and lower substrate it
Between encapsulate to form a closed chamber by sealing glue frame.
Further, the wetability isolation structures are wetability material coating.
Further, the wetability material is photoresist.
The beneficial effects of the utility model are：
The utility model is by setting public electrode, the first region and second electrode area, the first region and the second electricity
The area ratio of polar region is more than 3；It is driven by multi-electrode and completes the high response speed state switching that bistable electro soaks display device,
And power consumption is relatively low；A wetability isolation structures are provided with so that pixel compartments are divided into two regions on the insulating layer of each pixel compartments,
The contact angle of wetability isolation structures is 90 degree；By setting the wetability isolation structures that contact angle is 90 degree, aperture opening ratio is realized
Greatly, the good display device of display effect；The projection of wetability isolation structures on the electrically conductive is intersected with second electrode area；To give liquid
Drop provides the continuity electrowetting active force through wetability isolation structures, it is ensured that drop is crossed needed for wetability isolation structures
Energy barrier.
Description of the drawings
Specific embodiment of the present utility model is described further below in conjunction with the accompanying drawings：
Fig. 1 is an a kind of specific embodiment structure diagram of bistable electro wetting display device of the utility model；
Fig. 2 be a kind of bistable electro of the utility model wetting display device wetability isolation structures with zigzag without
A specific embodiment perspective view on the conductive layer of electrode district；
Fig. 3 be a kind of bistable electro of the utility model wetting display device wetability isolation structures with arc without electricity
A specific embodiment perspective view on the conductive layer of polar region；
Fig. 4 is the feelings that a kind of ink of bistable electro wetting display device of the utility model is moved in wetability coating surface
Condition schematic diagram；
Fig. 5 is the aperture opening ratio versus time curve schematic diagram of Fig. 4 bi-stable display devices under the voltage of 40V；
Fig. 6 is a kind of display fundamental diagram of bistable electro wetting display device of the utility model；
Fig. 7 is a kind of driver' s timing figure of bistable electro wetting display device of the utility model；
Wherein, 1 is the first region；2 be second electrode area；3 be insulating layer；4 be pixel wall construction；5 be first-class
Body；6 be second fluid；7 be sealing glue frame；8 be public electrode；9 be first substrate；10 be second substrate；11 for wetability every
Exhausted structure；12 be electrodeless area.
Specific embodiment
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the application can phase
Mutually combination.
A kind of bistable electro soaks display device, and with reference to figure 1, Fig. 1 is a kind of bistable electro wetting display of the utility model
One specific embodiment structure diagram of device；Bistable electro wetting display device includes upper substrate and lower substrate, upper substrate packet
Include first substrate 9 and public electrode 8, lower substrate includes second substrate 10 and the conductive layer being set in turn on second substrate, absolutely
Edge layer 3 and the pixel wall construction 4 for surrounding pixel compartments array；By taking a pixel compartments of Fig. 1 signals as an example, the conduction of each pixel compartments
Floor includes the first region 1, second electrode area 2 and is set to electrodeless area 12 between the two, the first region and the second electricity
The area ratio of polar region is more than 3；A wetability isolation structures 11 are provided with so that pixel compartments to be divided on the insulating layer 3 of each pixel compartments
Two regions, referring to figs. 2 and 3, Fig. 2 are a kind of wetability isolation structures of bistable electro wetting display device of the utility model
A specific embodiment perspective view on the conductive layer with the electrodeless area of zigzag；Fig. 3 is that the utility model is a kind of double
A specific embodiment of the wetability isolation structures of stable state electrowetting display device on the conductive layer with the electrodeless area of arc
Perspective view；The projection of wetability isolation structures 11 on the electrically conductive is intersected with second electrode area 2；Wetability isolation structures 11
Contact angle be 90 degree；In addition, bistable electro wetting display device further includes sealing glue frame 7, for by upper substrate and lower substrate
An entirety is packaged into, to form a closed chamber in whole inside, filled with immiscible the in closed chamber
One fluid 5 and second fluid 6, usually, first fluid 5 are colored ink, and second fluid 6 is electrolyte solution.
The utility model uses electrowetting principle, combines Graphic Design with surface wettability isolation structures by electrode,
The utility model by multi-electrode drive complete bistable electro soak display device high response speed state switch, and power consumption compared with
It is low；By setting the wetability isolation structures that contact angle is 90 degree, the display device that aperture opening ratio is big, display effect is good is realized；The
One electrode district and the area in second electrode area ratio are more than 3；The projection of wetability isolation structures on the electrically conductive and second electrode area
It is intersecting；To provide the continuity electrowetting active force through wetability isolation structures to first fluid, it is ensured that first fluid is crossed
Energy barrier needed for wetability isolation structures.Specifically, colored ink and electrolyte solution, colored ink are filled with
Meet with the relationship of electrolyte solution：When the first region is powered, under the electric field action of the first region, colored ink movement
Make the pixel compartments that the color of electrolyte solution be presented to one jiao of second electrode area；When second electrode area is powered, in the second electricity
Under the electric field action of polar region, cross surface wettability isolation structures and make the pixel compartments present ink color；During power-off, ink
Stop motion and make pixel compartments remain powered off before color.
Preferably, the projection of wetability isolation structures on the electrically conductive runs through second electrode area；It is further preferred that with reference to
Fig. 2 and Fig. 3, the projection of wetability isolation structures 11 on the electrically conductive are intersected simultaneously with the first region 1 and second electrode area 2；
It is highly preferred that the projection of wetability isolation structures 11 on the electrically conductive is simultaneously through the first region 1 and second electrode area 2, reason
It is more by upper perforative number, then first fluid to cross effect better, but tests difficulty and also therefore increase.
Further, in the utility model, first substrate and second substrate have same effect by taking glass substrate as an example
Material can be used as substrate.The thickness of first substrate and second substrate is respectively 0.7mm and 1.1mm.The first region and second
Electrode district is usually conductive material coating, such as the coats of metal such as ITO electro-conductive glass or silver, gold；The thickness (i.e. first of conductive layer
Electrode district and the thickness in second electrode area) it is normally controlled between 25-100nm.Insulating layer is drain insulating layer, drain insulating layer
Usually fluorinated polymer material (such as AF1600x, Cytop etc.).The public electrode of upper substrate is with high transparency and low electricity
Hinder the conductive layer (preferably ITO electro-conductive glass) of characteristic.First fluid is usually non-polar dyes small molecule in grease type solvent
Lysate, i.e. ink in the utility model, second fluid usually select polarity conductivity solution (such as sodium-chloride water solution), i.e.,
Electrolyte solution in the utility model；Sealing glue frame is shaped using ultra-violet curing pressure sensitive adhesive silk-screen, is selected in the utility model
Material be UV pressure-sensitive acrylates；The width range of wetability isolation structures is 2-10 microns.Wetability isolation structures
Altitude range be 0.5-1 microns；In order to easy to make, generally wetability coating is set rectangular.Wherein, for the side of making
Just, pixel compartments are generally made into rectangle, and the aperture opening ratios of rectangular pixels can be by controlling the first region and second electrode area
Area ratio is adjusted to realize.In addition, pixel wall construction can be by slot coated and the method for spin coating on drain insulating layer surface
First layer slightly water-wet photoresist (such as SU-8) is coated with, thickness is 5-8 μm；After being handled by heated drying, in corresponding rectangle
Under the action of mask plate slightly water-wet pixel wall construction and rectangular pixels structure are obtained through standard lithographic and developing process.
Further, referring to figs. 2 and 3, the shape in electrodeless area 12 is zigzag (Fig. 2), shaped form or arc (are schemed
3), correspondingly, the first region 1 and the edge in second electrode area 2 are zigzag, shaped form or arc；Wetability isolation structures
11 shape is rectangle.
With reference to figure 4, Fig. 4 is a kind of ink of bistable electro wetting display device of the utility model in wetability coating surface
The situation schematic diagram of movement；In the present embodiment, first fluid is ink (oil in Fig. 4), and second fluid is sodium-chloride water solution
(water in Fig. 4).Wetability isolation structures are wetability coating, and wetability material is coated in drain insulating layer and is formed, is soaked
Property material such as SU-8 photoresists.According to principle of energy balance, pixel opening process is equivalent to electric field energy and viscous work(is overcome to store
For the process of surface potential energy, and pixel closes process and can then regard storage surface potential energy as and the spontaneous of adhesion work is overcome to sprawl process.It will
Continue to keep ink pattern after a loss of power, then need enough energy barriers to balance the spreading force that surface potential energy is dominated.Such as Fig. 1 institutes
Show, there is provided 1 μm of height and 5 μm of wide wetability energy barrier (wetability coating) within the pixel.Theoretically, the radius of oil droplet connects with it
The size of feeler is directly related, therefore, the position of wetability energy barrier can be determined by the value of contact angle.Applying alive feelings
The contact angle of oil droplet under conditionFollow Lippmann-Young equations：
Here, 1 expression oil film in formula (1) is not applying the entire pixel of voltage V coverings (i.e.)；C is represented
The capacitance of per unit area；γowRepresent oil water interfacial tension；Negative sign represents the contact angle measured from oil phase rather than water phaseFor specific physical parameter setting such as table 1：
| The viscosity (Pa s) of oil | μ=0.0012 |
| Interfacial tension (the mJ/m of water and oil2) | γ=22 |
| The initial contact angle (degrees) of oil | α=0 |
| Oil volume (μm3) | V=123750 |
| The original depth (μm) of oil film | H=5.6 |
| The size (μm) of pixel | Lx=150 |
| The thickness (μm) of insulating layer | D=0.85 |
| The thickness (μm) of wetability coating | dr=1 |
| The width (μm) of wetability coating | L=5 |
Table 1
In order to make oil droplet shrink after without flow back, the contact angle of wetability energy barrierIt must satisfyUsually
In the case of, the contact angle of energy barrierBigger, the area shared by oil droplet is with regard to smaller, then the aperture opening ratio of the display element is also bigger.
If however,Oleophobic property is presented (i.e. in the surface of energy barrier) oil phase will be repelled so as to cause oil film movement
Shi Rongyi ruptures on the surface of energy barrier, so as to generate two oil droplets (rather than entire oil droplet is retracted to one jiao of pixel).
In summary, the wetability energy barrier (coating) the utility model proposes 90 ° of contact angles both can guarantee larger display aperture opening ratio,
Fracture phenomena occurs on the surface of energy barrier when being avoided that oil film movement again simultaneously.
Below by driving voltage to illustrate that bistable electro soaks the contact of the wetability isolation structures of display device for 40V
Aperture opening ratio changes with time situation when angle is 90 degree：
Assuming that oil droplet contraction process keeps spherical crown shape in pixel compartments, and volume remains unchanged, therefore oil droplet and hydrophobic insulation
The contact area A of layeroil(V) it is：
When not applying voltage, the initial contact angle α (usually less than 10 °) of spherical crown shape oil droplet can use spherical crown shape oil droplet body
Product v and contact radius R represents as follows：
The contact angle of spherical crown shape oil dropletAt any time the change procedure of t can also with blob volume v and contact radius R come
It represents as follows：
It may be defined as so as to the aperture opening ratio WA of pixel：
Wherein, A0 represents the contact area of ink and lower substrate when voltage is 0.
The numerical value of aggregative formula (1)-(5) and table 1 can obtain bistable display device aperture opening ratio versus time curve such as
Shown in Fig. 5, Fig. 5 is the aperture opening ratio versus time curve schematic diagram of Fig. 4 bi-stable display devices under the voltage of 40V, by
For Fig. 5 it is found that when the contact angle of wetability isolation structures is 90 degree, the aperture opening ratio of display device can reach 75%, have larger
Aperture opening ratio.
With reference to figure 1, Fig. 2, Fig. 4, Fig. 6 and Fig. 7, Fig. 6 is a kind of the aobvious of bistable electro wetting display device of the utility model
Show fundamental diagram；Fig. 7 is a kind of driver' s timing figure of bistable electro wetting display device of the utility model；Wherein, in Fig. 6
(a) it is the schematic diagram after first fluid and second fluid filling, is not powered on pressing；After (b) in Fig. 6 is powered up for the first region 1
Schematic diagram；(c) in Fig. 6 is the schematic diagram that first fluid 5 is in stable state after the voltage for removing the first region 1；In Fig. 6
(d) be second electrode area 2 power up after schematic diagram.In the present embodiment, driving voltage is by taking 40V as an example, wetability isolation structures
Intersect simultaneously with the first region and second electrode area in the projection of conductive layer, specifically, wetability isolation structures 11 are in conduction
Projection on floor is simultaneously through the first region 1 and second electrode area 2.Then as shown in (b) in Fig. 6, add in public electrode 8
After the direct current of 0V and the first region 1 plus 40V, under the action of electrowetting effect, first fluid 5 can be retracted to second electrode
One jiao in area 2, at this point, pixel compartments show the color of second fluid 6；As shown in (c) in Fig. 6, after removing voltage, in pixel
First fluid 5 will keep steady-state characteristic under the action of wetability isolation structures 11；According to Lippmann-Young equations
(formula (1)), driving voltage V is bigger, the contact angle of oil dropletIt is bigger,The potential energy of bigger accumulation is bigger.If break electricity
First fluid 5 is made to keep stablizing the contact angle for the wetability coating for then needing bigger after pressureIt is enough to generate
Big energy barrier prevents the first fluid 5 from moving (shown in Fig. 4)；As shown in (d) in Fig. 6, first fluid 5 to be made to cross the wetting
Sexual isolation structure 11 needs the voltage in public electrode 8 and second electrode area 2 plus bigger, when voltage overcome enough wetability every
The potential barrier that exhausted structure 11 generatesWhen, then first fluid 5 can cross wetability isolation structures 11 and move to
The surface of the corresponding drain insulating layer of one electrode district, since the area of the first region is more than the area in second electrode area,
At this point, pixel compartments show the color of first fluid 5；Wherein, in (d) in Fig. 6 a part of first fluid 5 remain in it is electrodeless
Region makes first fluid 5 can be good at being restored to the state ((a) in Fig. 6) for being initially filled with entire pixel compartments just；It removes again
After voltage, first fluid 5 will be paved with entire pixel until returning to original state and keeping steady-state characteristic (in Fig. 6
(a))。
It is that the preferable of the utility model is implemented to be illustrated, but the invention is not limited to the reality above
Example is applied, those skilled in the art can also make various equivalent variations without departing from the spirit of the present invention
Or replace, these equivalent deformations or replacement are all contained in the application claim limited range.
Claims (10)
1. a kind of bistable electro soaks display device, including upper substrate and lower substrate, the upper substrate includes first substrate and public affairs
Common electrode, which is characterized in that
The lower substrate includes second substrate and the conductive layer being set in turn on the second substrate, insulating layer and surrounds pixel
The pixel wall construction of lattice array；
The conductive layer of each pixel compartments includes the first region, second electrode area and is set to electrodeless area between the two, institute
The area ratio for stating the first region and second electrode area is more than 3；
A wetability isolation structures are provided with so that pixel compartments are divided into two regions, the wetting on the insulating layer of each pixel compartments
The projection of sexual isolation structure on the electrically conductive is intersected with second electrode area；The contact angle of the wetability isolation structures is 90 degree.
A kind of 2. bistable electro wetting display device according to claim 1, which is characterized in that the wetting sexual isolation knot
The projection of structure on the electrically conductive is intersected with the first region.
A kind of 3. bistable electro wetting display device according to claim 1, which is characterized in that the wetting sexual isolation knot
The width range of structure is 2-10 microns.
A kind of 4. bistable electro wetting display device according to claim 1, which is characterized in that the wetting sexual isolation knot
The altitude range of structure is 0.5-1 microns.
5. a kind of bistable electro wetting display device according to any one of claims 1 to 4, which is characterized in that described exhausted
Edge layer is drain insulating layer.
A kind of 6. bistable electro wetting display device according to any one of claims 1 to 4, which is characterized in that the nothing
The shape of electrode district is zigzag or shaped form.
A kind of 7. bistable electro wetting display device according to any one of claims 1 to 4, which is characterized in that the profit
The shape of moist isolation structures is rectangle.
8. a kind of bistable electro wetting display device according to any one of claims 1 to 4, which is characterized in that described double
Stable state electrowetting display device further includes sealing glue frame, encapsulates to form one by sealing glue frame between the upper substrate and lower substrate
Closed chamber.
A kind of 9. bistable electro wetting display device according to any one of claims 1 to 4, which is characterized in that the profit
Moist isolation structures are wetability material coating.
A kind of 10. bistable electro wetting display device according to claim 9, which is characterized in that the wetability material
For photoresist.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721340373.9U CN207488614U (en) | 2017-10-17 | 2017-10-17 | A kind of bistable electro soaks display device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721340373.9U CN207488614U (en) | 2017-10-17 | 2017-10-17 | A kind of bistable electro soaks display device |
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| Publication Number | Publication Date |
|---|---|
| CN207488614U true CN207488614U (en) | 2018-06-12 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107765423A (en) * | 2017-10-17 | 2018-03-06 | 华南师范大学 | A kind of bistable electro wetting display device and preparation method thereof |
| CN110288954A (en) * | 2019-07-26 | 2019-09-27 | 福州大学 | A kind of driving method of the more gray scale electric moistening displays of low-power consumption |
-
2017
- 2017-10-17 CN CN201721340373.9U patent/CN207488614U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107765423A (en) * | 2017-10-17 | 2018-03-06 | 华南师范大学 | A kind of bistable electro wetting display device and preparation method thereof |
| CN110288954A (en) * | 2019-07-26 | 2019-09-27 | 福州大学 | A kind of driving method of the more gray scale electric moistening displays of low-power consumption |
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Effective date of registration: 20240612 Address after: 518000 b715, Yinxing technology building, 1301 Guanlan community sightseeing Road, Guanlan street, Longhua District, Shenzhen City, Guangdong Province Patentee after: SHENZHEN GUOHUA OPTOELECTRONICS Co.,Ltd. Country or region after: China Address before: South China advanced Optoelectronics Research Institute, South China Normal University, No. 378, Waihuan West Road, Panyu District, Guangzhou City, Guangdong Province, 510006 Patentee before: SOUTH CHINA NORMAL University Country or region before: China Patentee before: SHENZHEN GUOHUA OPTOELECTRONICS Co.,Ltd. Patentee before: ACADEMY OF SHENZHEN GUOHUA OPTOELECTRONICS |