CN100596333C - Display unit and display device based on microcapsule technology - Google Patents
Display unit and display device based on microcapsule technology Download PDFInfo
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- CN100596333C CN100596333C CN200710177689A CN200710177689A CN100596333C CN 100596333 C CN100596333 C CN 100596333C CN 200710177689 A CN200710177689 A CN 200710177689A CN 200710177689 A CN200710177689 A CN 200710177689A CN 100596333 C CN100596333 C CN 100596333C
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Abstract
A display unit based on the microencapsulation technology comprises a fluid chamber and an electrode structure. The fluid chamber comprises a microencapsulation provided with charges and at least twotypes of fluid; the two types of fluid which are contacted with each other can not mix with each other; in addition, the external of the fluid chamber can not mix with the fluid; and different opticalproperties exist among all types of fluid. The electrode structure comprises two electrodes respectively arranged at two ends of the fluid chamber, and two openings are arranged at two ends which areopposite to each other on the chamber wall; the openings are connected with each other by an external fluid tube, so that the fluid can access to the chamber. The fluid tube is made of transparent material, and is worked as an observation surface. Voltage is added to the electrodes to generate electrical field force, thereby driving the microencapsulation with charges to move in the chamber, andfurther driving the fluid to flow in the chamber and the fluid tube; so that the fluid tube can show different optical properties. By adopting at least one display unit of the invention, a low-energy-consumption display device based on the microencapsulation technology can be achieved.
Description
Technical field
Relate to a kind of display technique and device thereof, in the enclosed environment that chamber and mozzle constitute, flow and be implemented in display technique and the display device that sightingpiston shows different optical characteristics thereby particularly utilize the effect of electric field force to promote a plurality of non-conductive liquid with different optical characteristic based on microcapsules.
Background technology
According to the ABC of electricity, have electric field force between the electric charge, the electric charge of identical polar has mutually exclusive electric field force, and has the electric field force that attracts each other between the electric charge of opposed polarity.It is exactly electrophoresis that electric charge in liquid moves under the effect of electric field force.Utilize electric field force numerous different technology also to occur with the technology of electrophoresis exploitation electronic display unit and Electronic Paper.
One class is the display that the double-colored element of rotation constitutes, for example put down in writing (although this types of display is commonly called " rotation twin color ball " display in the U.S. Patent No. 5808783,5777782,5760761,6054071,6055091,6097531,6218124,6137467,6147791, but it is more accurate to rotate double-colored element, because rotating element is also aspheric in more above-mentioned patents).This display has adopted and has contained two or more wisps (being generally spherical or cylindrical) with part of different optical character in a large number, and a kind of internal dipole.These wisps suspend and are filled with in the substrate in the vacuole of liquid, and this vacuole is filled with liquid so that described object can rotate freely.Apply electric field to display, also change the object part of being seen by the observation surface thereby make described object rotate to all places, thereby change presenting of display.This class display is generally bistable display.
The another kind of electrophoretic display device (EPD) that is based on particle, people have carried out development research for many years to it, and wherein charged particle moves through the fluid of suspension under electric field action.Compare with LCD, electrophoretic display device (EPD) can have good brightness and contrast, widely visual angle, bistable state and advantage of low power consumption.
Assign to or a large amount of patents and the application that belong to Massachusetts Institute of Technology (MIT) and E-InkCorporation be disclosed, wherein put down in writing the electrophoretic medium of encapsulation.The electrophoretic medium of this encapsulation comprises a large amount of Caplets, and each Caplet itself comprises and contains the capsule wall that the electrophoresis that is suspended in the liquid suspension medium moves the disperse phase of particle and is being full of this disperse phase.Typically, described capsule self is fixed in a kind of polymer adhesive, thus the coherent layer that between two electrodes, forms.This class encapsulation medium is record to some extent among WO 99/67678, WO 00/05704, WO 00/38000, WO 00/38001, WO00/36560, WO 00/67110, WO 00/67327, WO 01/07961, WO 01/08241, WO 03/107315, WO 2004/023195 and the WO 2004/049045 in for example U.S. Patent No. 5930025,5961804,6017584,6067185 etc. and publication number.
Another kind of relevant electrophoretic display device (EPD) is called as " microcell electrophoretic display ".In microcell electrophoretic display, charged particle and suspension liquid are not encapsulated in the microcapsules, replace to stay in a large amount of chambers that form in the mounting medium (being generally polymer film).Referring to for example publication number is international application and the disclosed U. S. application No.2004/0075556 of WO 02/01281, and the two is all assigned to Sipix Imaging, Inc..
Electrophoretic display device (EPD) only needs very low electric power to come to switch to another kind of state from a kind of state.Yet electrophoretic display device (EPD) does not have unlimited picture steadiness.Blang's diffusion of granules of pigments and sedimentation and owing to apply the motion that little residual voltage drove that switch pulse and other factors cause all might decay and switch the optical states that is obtained by display.There is not mechanism to prevent under the situation of this optical states decay, the necessary regular update of described optical states, the refresh display consumed power, thereby reduced the practicality of this display, be difficult to or can not under the situation that does not have blanking pulse (ordering about the pulse of pixel under the one extreme optical state before promptly being driven to final desired optical states), have finished the renewal of single pixel.Still be badly in need of improving the picture steadiness of electrophoretic medium for this reason.
The method that discloses the electrophoretic particles by the polymer shell with modification is provided in application number is 200480036461.9 Chinese patent application " electrophoretic medium " is to produce fast and the display of image stabilization.The method for making of electrophoretic particles is provided simultaneously.
Summary of the invention
The invention provides a kind of new based on the display unit designing technique of electric field force and display device and the Electronic Paper that comprises this display unit.Have the good brightness and contrast that above-mentioned electrophoretic display device (EPD) possesses, the visual angle outside bistable state and the advantage of low power consumption, also has better pictures stability widely.Can support simultaneously the liquid display unit and the display device of a plurality of color resolutions, and just can effectively control, to realize the slim display application of low energy consumption by less voltage.
To achieve these goals, the technical scheme of proposition is as follows:
Display unit comprises:
Fluid chamber, it comprises microcapsules and at least two kinds of fluids that have a kind of electric charge, and fluid is in contact with one another and immiscible and microcapsules skin and fluid also unmixing, has different optical characteristics between every kind of fluid; With
Electrode structure wherein comprises and is positioned at each electrode of fluid chamber two ends; Simultaneously
Chamber wall is provided with two openings in its relative end, and described opening utilizes the external fluid pipe to interconnect, and makes the circulation of fluid turnover chamber;
The tube wall of above-mentioned fluid hose is that transparent material is made.
In fluid chamber, the microcapsules that have a kind of electric charge are positioned at the centre position, and both sides are respectively the fluids with different optical characteristic.The subspace of capacity such as preferably in chamber, be divided in the space of space except the microcapsules that have a kind of electric charge take up space and fluid hose equably, optical characteristics order (as shade order or color spectrum order or bright order) according to different fluid is filled each subspace respectively, makes the occupied space of various fluids form the colour band of similar many colors.
Therefore with the sightingpiston of fluid hose as display unit, and the tube wall of fluid hose is transparent, when fluid flows, be trapped in that fluid changes in the fluid hose in chamber and fluid hose, thereby the optical characteristics of observation changes.
In preferred the realization, make every kind of fluid approaching, can realize that fluid keeps a kind of stable status in chamber and fluid hose with the proportion of the microcapsules that have a kind of electric charge.
Preferred realization also comprises the cross-sectional area that the makes fluid hose cross-sectional area much smaller than chamber, thereby the liquid flow that minute movement that microcapsules take place at chamber is caused can produce bigger displacement in fluid hose, thereby be implemented in and apply the changes in optical properties that less voltage just can be controlled display unit on the electrode, realize the variation of display message.
Variant and each other the unmixing between the various fluids except optical characteristics, preferably various fluids all are hydrophobic, as hydrocarbon system row machine oil is exactly not miscible, with HFC-134a and CFC-12 (fluorochlorohydrocarbon) is example, the two is unmixing both, water insoluble again, can add different pigment respectively and form different optical characteristics, selection simultaneously has a kind of cyst material and fluid unmixing of microcapsules of electric charge.In application number is 200480036461.9 Chinese patent application " electrophoretic medium ", disclose some and had the charged particle material therefor of immiscible characteristic, quote in full this patented claim in the present invention, and with disclosed material wherein and the method for making microcapsules as the technology of quoting that realizes making among the present invention microcapsules, unique difference in the making is the electric charge that has only a kind of polarity in the capsule.
During the display unit of the fluid of two kinds of colors of preferred a kind of usefulness was realized, the Fluid Volume between electrically charged microcapsules and the two kinds of fluids was selected as follows:
First kind of Fluid Volume=second kind of Fluid Volume, and
First kind of Fluid Volume that Fluid Volume=fluid hose can hold, and
The capacity of first kind of Fluid Volume+electrically charged microcapsules amount=chamber (not comprising the fluid hose capacity).
In above-mentioned preferred two kinds of fluid display units are realized, be controlled at the voltage swing that applies on the electrode, make electrically charged microcapsules can not enter fluid hose.Three kinds of colors of display unit are: color in fluid hose of first kind of fluid, second fluid color and the color that presents of first kind of fluid and the second kind of fluid fluid hose space that respectively accounts for half in fluid hose.
Correspondingly, during a kind of display unit of more colors was realized, preferably various fluids had identical amount and all equal the fluid hose amount of capacity.
On the other hand, in order to improve the stability of display unit optical characteristics, have at the fluid chamber two ends and can independently hold and the charged liquid of described charged microcapsules opposite polarity or the capacitor of charged microcapsules.In capacitor, be filled with the charged liquid or the charged microcapsules of identical charges amount.Because the electrically charged polarity of charged liquid in the capacitor or charged microcapsules institute is opposite with the electrically charged polarity of charged microcapsules institute in the chamber, when charged microcapsules in the chamber move to an end of chamber, even the voltage on the electrode removes, but since the capacitor of this end be filled with chamber in the charged liquid of charged microcapsules opposite polarity or charged microcapsules and distance littler than the distance of charged microcapsules in the capacitor of the other end and the chamber, therefore has bigger electrical field attraction, thereby the position of charged microcapsules in chamber in the maintenance chamber is with the picture steadiness of further enhancing display unit.
Preferably fluid chamber is columniform.
Preferably fluid chamber covers an insulation course in the face of the inwall of fluid, and this insulation course is hydrophobic or oleophobic.
Preferably charged microcapsules in fluid chamber between two kinds of fluids with different optical characteristic.
Preferably electrode comprises a series of planar electrodes relevant with the chamber shape of cross section.
Preferably two electrodes are positioned at the two ends of chamber, when guaranteeing to apply voltage on electrode, control charged microcapsules moving axially along chamber in chamber.
Preferably described fluid is a liquid.
Preferably described fluid is non-conductive fluid.
Preferably fluid is an oil.
Preferably a kind of fluid is a black, and one other fluid is a white.
Preferably multiple fluid is pressed certain optical characteristics series arrangement in chamber and external fluid pipe.
In fluid chamber, fluid is in two opposite ends, middlely embeds one or more charged microcapsules, preferably the slightly larger in diameter of microcapsules in or equal the cross-sectional diameter of chamber, can be mobile to guarantee fluid by slit between microcapsules and the chamber wall.Perhaps in other words, charged microcapsules place between other two kinds of fluids.Because two electrodes lay respectively at the two ends of chamber, therefore when when two electrodes provide voltage, one of them electrode will have positive charge, another electrode will have negative charge, if the microcapsules in the chamber have positive charge, then under the effect of electric field force, the microcapsules in the chamber will move to the end that the negative charge electrode is arranged.The fluid that microcapsules moving in chamber directly promotes in the chamber flows at chamber and fluid hose, thereby changes the optical characteristics as fluid in the fluid hose of sightingpiston.And in case microcapsules move to any end at chamber, under the electric field force effect of the charge generation of capacitor, even remove voltage on the electrode, the microcapsules in the chamber keep steady state (SS) under the electric field force effect that the capacitor electric charge forms.
On the other hand.Because the cross-sectional area of chamber is much larger than the cross-sectional area of fluid hose, so the little displacement that produces of microcapsules just can promote electrofluid bigger variation in fluid hose, so can use very low Control of Voltage display unit change in color.
This display unit is fit to do display device very much, comprises:
The display unit that at least one is above-mentioned and each display unit is connected to circuit to produce the device of matrix display.
This display unit also is fit to make flexible electronic paper, comprises:
In flexible material, mount an above-mentioned display unit at least and each display unit is connected to the device of circuit with update displayed unit displaying contents.
Beneficial effect of the present invention can be found out from above-mentioned realization, adopts the present invention can realize the display unit and the display device of multiresolution, low driving voltage, low energy consumption, and can realize a kind of Application of Electronic Paper in the flexible matrix material.Simultaneously owing to keep optical states behind the voltage that the show state of each display unit can apply removing, so the display device of manufacturing or Electronic Paper can show identical content for a long time and not need to consume any electric energy.Only therefore ability consumed power when the needs update content is a kind of very energy-conservation display technique.
Description of drawings:
Fig. 1 is that employing is of the present invention by having the display unit principle of work synoptic diagram that two kinds of different fluids of optical characteristics and electrically charged microcapsules constitute, wherein Fig. 1 a is the display unit synoptic diagram that two kinds of fluids individual space that takies half in fluid hose presents Neutral colour, Fig. 1 b is that black fluid is full of the display unit synoptic diagram that the whole spaces of fluid hose present black, and Fig. 1 c is that white fluid is full of the display unit synoptic diagram that the whole spaces of fluid hose present white.
Fig. 2 a, Fig. 2 b, Fig. 2 c adopt a kind of exemplary plot that realizes being in respectively different conditions of display unit of the present invention
Fig. 3 be adopt of the present invention increased be filled with chamber in microcapsules a kind of realization example figure of display unit of capacitor of electrically charged opposite polarity charged liquid or microcapsules.
Fig. 4 is that employing is of the present invention by having the display unit principle of work synoptic diagram that three kinds of different fluids of optical characteristics and electrically charged microcapsules constitute, wherein Fig. 4 a is that first kind of fluid is full of the display unit synoptic diagram that the whole spaces of fluid hose present first kind of fluid optical characteristics, Fig. 4 b is that second kind of fluid is full of the display unit synoptic diagram that the whole spaces of fluid hose present second kind of fluid optical characteristics, and Fig. 4 c is that the third fluid is full of the display unit synoptic diagram that the whole spaces of fluid hose present the third fluid optical characteristics.
Fig. 5 constitutes the display pixel array principle schematic with a plurality of display units.
Embodiment:
Fig. 1 is that employing is of the present invention by having the display unit principle of work synoptic diagram that two kinds of different fluids of optical characteristics and electrically charged microcapsules constitute.Chamber 102 is a hollow with fluid hose 101 inside, and realizes liquid flowing in chamber and fluid hose by inside opening.In diagram, electrically charged microcapsules 103 have positive charge, microcapsules 103, fluid 104, fluid 105 be unmixing each other, fluid 104 has different optical characteristics with fluid 105, such as, in this example, fluid 104 is black fluid the fluid of black pigment (or added), and fluid 105 is white fluid the fluid of Chinese white (or added).Electrode 106, electrode 108 lay respectively at the chamber two ends.Chamber inner wall covers insulation course and hydrophobic layer or covers the i.e. hydrophobic again individual layer (not drawing) of insulation.Because electrically charged microcapsules have positive charge.When applying voltage on two electrodes, then on an electrode, positive charge is arranged, on another electrode negative charge is arranged, repel mutually under the electric field force effect that attracts each other with the opposed polarity electric charge at like charges, positively charged microcapsules move to the electrode direction that negative charge is arranged, and promote positively charged microcapsules and move also propelling fluid 104, fluid 105 turnover fluid hoses along chamber tube's axis XX ' in chamber.If with the fluid hose is sightingpiston, just can see different optical characteristics.Wherein Fig. 1 a is the display unit synoptic diagram that two kinds of fluids respectively take half in fluid hose space presents Neutral colour, Fig. 1 b is that black fluid is full of the display unit synoptic diagram that the whole spaces of fluid hose present black, and Fig. 1 c is that white fluid is full of the display unit synoptic diagram that the whole spaces of fluid hose present white.With the fluid hose is optical observation face, and its axis OO ' is the optical axis of symmetry of display unit.
Fig. 4 is that employing is of the present invention by having the display unit principle of work synoptic diagram that three kinds of different fluids of optical characteristics and electrically charged microcapsules constitute.Different with Fig. 1 is has adopted three kinds to have all unmixings of different optical characteristic and immiscible fluid 404,405,409 and electrically charged microcapsules.Be applied to voltage between electrode 106 and the electrode 108 by suitable control, can control fluid 404,405,409 in fluid hose the difference amount and present different optical characteristics.Wherein Fig. 4 a is that first kind of fluid is full of the display unit synoptic diagram that the whole spaces of fluid hose present first kind of fluid optical characteristics, Fig. 4 b is that second kind of fluid is full of the display unit synoptic diagram that the whole spaces of fluid hose present second kind of fluid optical characteristics, and Fig. 4 c is that the third fluid is full of the display unit synoptic diagram that the whole spaces of fluid hose present the third fluid optical characteristics.With the fluid hose is optical observation face, and its axis OO ' is the optical axis of symmetry of display unit.
The realization that regards to display unit is down done and is described in further detail.
Fig. 2 a, Fig. 2 b, Fig. 2 c adopt a kind of exemplary plot that realizes being in respectively different conditions of display unit of the present invention.This display unit 220 comprises immiscible two kinds of fluids 250,251, for example liquid and microcapsules 240.Wherein microcapsules 240 are charged, for example positive charge or negative charge; Fluid 250 and fluid 251 are the fluids with different optical characteristic, as with two kinds of immiscible oil, add Chinese white and black pigment respectively.In this embodiment, microcapsules 240 are sandwiched between fluid 250 and the fluid 251.
Fluid is accommodated in chamber 222 and the fluid hose 238, and wherein microcapsules 240 all are placed in the chamber, occupies the most of space of chamber, and fluid 250 and fluid 251 lay respectively in chamber microcapsules 240 two ends and the fluid hose, and same capability is arranged.Show as at this embodiment middle chamber 222 longitudinal extension that limits by sidewall 224 pipe form and have a tube's axis.In this specific example, chamber is a cylindrical tube, and its tube's axis is XX '. Other wall 226 and 228 extends to form the chamber 222 of sealing fluid in the end of pipe.
Full of liquid and charged particles in the microcapsules 240, cyst wall have certain flexibility can keep certain shape, in the transversely extension of display unit 220 chamber tube's axis XX '.
Typically, in the part that microcapsules 240, fluid 250,251 is limited to chamber 222 expections, the chamber wall has certain hydrophobicity or oleophobic property for each fluid and microcapsules.
The whole inboard of chamber wall is insulated all that layer covers and this insulation course also covers a hydrophobic layer or oleophobic layer, has not only insulated but also the layer 248 of hydrophobic or oleophobic covers the inboard of chamber walls as interchangeable, shown in Fig. 2 a, 2b, 2c.Under state of display unit, there is not voltage to be applied on electrode 230 and the electrode 232, there is not the external electrical field acting force, microcapsules 240 are static.
If on electrode 230 and electrode 232, apply voltage, connect positive polarity as electrode 230, electrode 232 connects the voltage negative pole, have positive charge on the electrode 230 this moment, electrode 232 has negative charge, because microcapsules 240 are positively charged in this example, therefore electrode 230 forms the electric field force that repels with microcapsules 240, electrode 232 forms the electric field force that attracts with microcapsules 240, under the effect of this power, microcapsules 240 move to electrode 232 ends, and when voltage was kept on the electrode, this moved the right wall 228 that will continue or arrive chamber up to microcapsules 240.If the voltage between electrode 230 and the electrode 232 is turned off, microcapsules 240 will remain on the position that it has arrived.
Fig. 2 c shows the situation that microcapsules 240 almost arrive right wall 228, makes fluid 251 by in the almost whole incoming fluid pipes 238 of opening 237.With fluid hose 238 is sightingpiston, and when fluid hose 238 was transparent material, observed was the color that optical characteristics reflected of fluid 251.With the fluid hose is optical observation face, and its axis OO ' is the optical axis of symmetry of display unit.
In order to realize beginning the required electric field force of mobile microcapsules 240, only need little voltage, for example only several volts, so voltage source is a low pressure source.
During microcapsules 240 moved right, the microcapsules 240 that move right flow to the outside of chamber via the opening on the wall of chamber 237 at its right side extrusion fluid 251.The fluid hose 238 guiding fluids 251 that are connected to the opening 236 in this opening and chamber left side enter fluid hose 238 from opening 237, and fluid 250 is got back to chamber from opening 236 simultaneously.
Fig. 2 b shows second optical characteristics state of display unit, this state will be by applying reverse voltage on electrode 230 and electrode 232, be that electrode 230 connects the voltage negative pole, electrode 232 connects positive polarity, have negative charge on the electrode 230 this moment, electrode 232 has positive charge, because microcapsules 240 are positively charged in this example, therefore electrode 230 forms the electric field force that attracts with microcapsules 240, electrode 232 forms the electric field force that repels with microcapsules 240, and under the effect of this power, microcapsules 240 move to electrode 230 ends, when voltage was kept on the electrode, this moved the left wall 226 that will continue or arrive chamber up to microcapsules 240.If the voltage between electrode 230 and the electrode 232 is turned off, microcapsules 240 will remain on the position that it has arrived.
During microcapsules 240 were moved to the left, the microcapsules 240 that are moved to the left flow to the outside of chamber via the opening on the wall of chamber 236 at its left side extrusion fluid 250.The fluid hose 238 guiding fluids 250 that are connected to the opening 237 on this opening and chamber right side enter fluid hose 238 from opening 236, and fluid 251 is got back to chamber from opening 237 simultaneously.
With fluid hose 238 is sightingpiston, and when fluid hose 238 was transparent material, observed was the color that optical characteristics reflected of fluid 250.With the fluid hose is optical observation face, and its axis OO ' is the optical axis of symmetry of display unit.
Fig. 2 a be display unit show as a kind of between fluid 250 optical characteristics and a kind of state between the optical characteristics of fluid 251.With above-mentioned same principle,, can make fluid 250 and fluid 251 be full of half space of fluid hose respectively by applying the voltage of certain hour at (under Fig. 2 c state) between electrode 230 and the electrode 232.Be sightingpiston with fluid hose 238 this moment, and when fluid hose 238 was transparent material, observed was that the optical characteristics of fluid 250 and the optical characteristics of fluid 251 are mixed the color that is reflected.With the fluid hose is optical observation face, and its axis OO ' is the optical axis of symmetry of display unit.
In fact, the personnel in affiliated field understand, by suitable control put between electrode 230 and the electrode 232 voltage and hold time, can control the ratio that fluid 250 and fluid 251 are taken up space in fluid hose, thereby obtain multiple between the optical characteristics of fluid 250 and the hybrid optical characteristic of the optical characteristics between the fluid 251.
Here the optical characteristics of indication can be reflection characteristic, transmissison characteristic of the color reflection characteristic, transmissison characteristic etc. of visible light or invisible light etc., therefore can be applied to the demonstration field of visible light reflection or transmission, also can be applicable to the changes in optical properties field of non-visible light.
Shown in Fig. 2 a, 2b, 2c, select the amount of microcapsules 240 and for the selections of fluid 250 and 251 amounts, a kind of preferred scheme is to satisfy following relation:
1) amount of the amount=fluid 251 of fluid 250, and
2) 238 Fluid Volumes that can hold of the amount=fluid hose of fluid 250, and
3) capacity of the amount=chamber 222 of the amount+microcapsules 240 of fluid 250 (not protecting the capacity that contains in the fluid hose 238).
In the embodiment shown in Fig. 2 a, 2b, 2c, wherein fluid 250 and fluid 251 are mutual not miscible oil, and have different optical characteristics separately, and at microcapsules 240 and insulation course 248 extremely thin oil film being arranged, this film serves as the lubricating film that microcapsules 240 move in chamber.
Fig. 3 be adopt of the present invention increased be filled with chamber in microcapsules a kind of realization example figure of display unit of capacitor of electrically charged opposite polarity charged liquid or microcapsules.Be with the difference of example shown in Figure 2, in this embodiment the wall 328,326 at chamber two ends is designed to the capacitor of inner hollow, and in capacitor, be filled with chamber in electrically charged opposite polarity charged liquid of microcapsules institutes or microcapsules, as being the liquid that is filled with negative charge or negative ion in this example, other parts have identical structure.In example shown in Figure 3, because the existence of capacitor makes microcapsules 240 can only be stabilized in three location statuss, the i.e. middle of the rightmost of the Far Left of chamber, chamber and chamber.And when two electrodes all do not apply voltage, because when microcapsules 240 are positioned at the middle of chamber, if vibrate than great machinery, make microcapsules 240 depart from the middle of chamber, in capacitor under the effect of electric charge, may make microcapsules 240 move to close capacitor one end, thereby change the optical characteristics of display unit.In order to make display unit have good optical stability, can only utilize two kinds of optical states of this example: microcapsules 240 are positioned at the Far Left of chamber and the rightmost that microcapsules 240 are positioned at chamber.At this moment display unit has fabulous optical stability, is the realization technology of comparatively ideal bistable display or Electronic Paper.Simultaneously, because the existence of capacitor, when needing the show state of switching display unit, need to improve the initial voltage that is applied between electrode 230 and the electrode 232, to overcome the electric field force that capacitor produces, correspondingly, cross the position, middle of chamber when microcapsules 240, the existence of capacitor will speed up moving of microcapsules 240, and its effect can show as two aspects: the fastest if desired on the one hand switch speed, then can keep the voltage on the electrode, on the other hand, best if desired saving energy consumption then can be removed the voltage on the electrode this moment, and the electric field force that is produced by capacitor can continue to promote moving of microcapsules 240.
Fig. 5 constitutes the display pixel array principle schematic with a plurality of display units.Because each display unit 500 comprises two electrodes, in the pixel-matrix display that forms was realized, the line scanning electrode of every row needed one, as shown 501, the column scan electrode of every row needs one, as shown 503.In complete display circuit, also comprise data storage cell and pixel drive unit, do not draw among the figure.A kind of implementation is display unit evenly to be laid in to have on the electrode base board (be similar to LCD technology).The fluid hose part that need guarantee each display unit when laying gets final product towards sightingpiston.
Adopt and use the same method, be laid in to make flexible display device in the soft organic material or be laid on the material of stationery material and can make Electronic Paper.
Owing to keep optical states behind the voltage that the show state of each display unit can apply removing, so the display device of manufacturing or Electronic Paper can show identical content for a long time and not need to consume any electric energy.Only therefore ability consumed power when the needs update content is a kind of very energy-conservation display technique.
Claims (10)
1, display unit comprises:
Fluid chamber, it comprises microcapsules and at least two kinds of fluids that have a kind of electric charge, and fluid is in contact with one another and immiscible and microcapsules skin and fluid also unmixing, has different optical characteristics between every kind of fluid; With
Electrode structure wherein comprises and is positioned at each electrode of fluid chamber two ends; Simultaneously
Chamber wall is provided with two openings in its relative end, and described opening utilizes the external fluid pipe to interconnect, and makes the circulation of fluid turnover chamber;
The tube wall of above-mentioned fluid hose is that transparent material is made.
2, display unit as claimed in claim 1 it is characterized in that the inwall that fluid chamber faces fluid and microcapsules covers an insulation course, and this insulation course is hydrophobic or oleophobic.
3, display unit as claimed in claim 1, the microcapsules that it is characterized in that having electric charge in fluid chamber between two kinds of fluids with different optical characteristic.
4, display unit as claimed in claim 1, it is characterized in that the fluid chamber two ends have can independently hold and the charged liquid of the described microcapsules opposite polarity that has an electric charge or the capacitor of charged microcapsules.
5, as each described display unit among the claim 1-4, it is characterized in that the microcapsules that have a kind of electric charge have positive charge, charged liquid in the capacitor or charged microcapsules have negative charge.
6, as each described display unit among the claim 1-4, it is characterized in that the microcapsules that have a kind of electric charge have negative charge, charged liquid in the capacitor or charged microcapsules have positive charge.
7, as each described display unit among the claim 1-4, it is characterized in that a kind of fluid is a black, one other fluid is a white.
8, as each described display unit among the claim 1-4, it is characterized in that multiple fluid by certain optical characteristics series arrangement in chamber and external fluid pipe.
9, display device comprises:
At least one is connected to circuit to produce the device of matrix display as each described display unit among the claim 1-8 with each display unit.
10, flexible electronic paper comprises:
In the flexible matrix material, mount one at least and be connected to the device of circuit with update displayed unit displaying contents as each described display unit among the claim 1-8 with each display unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710177689A CN100596333C (en) | 2007-11-20 | 2007-11-20 | Display unit and display device based on microcapsule technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710177689A CN100596333C (en) | 2007-11-20 | 2007-11-20 | Display unit and display device based on microcapsule technology |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101169566A CN101169566A (en) | 2008-04-30 |
| CN100596333C true CN100596333C (en) | 2010-03-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200710177689A Expired - Fee Related CN100596333C (en) | 2007-11-20 | 2007-11-20 | Display unit and display device based on microcapsule technology |
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| Country | Link |
|---|---|
| CN (1) | CN100596333C (en) |
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- 2007-11-20 CN CN200710177689A patent/CN100596333C/en not_active Expired - Fee Related
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| CN101169566A (en) | 2008-04-30 |
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