CN102376256A - Driving method of display unit - Google Patents
Driving method of display unit Download PDFInfo
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- CN102376256A CN102376256A CN2010102546197A CN201010254619A CN102376256A CN 102376256 A CN102376256 A CN 102376256A CN 2010102546197 A CN2010102546197 A CN 2010102546197A CN 201010254619 A CN201010254619 A CN 201010254619A CN 102376256 A CN102376256 A CN 102376256A
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Abstract
The invention relates to a driving method of a display unit, which comprises the following steps of: applying a first voltage difference between first and second electrodes, so that first particles move towards the direction of the second electrode; stopping applying the first voltage difference; and applying a second voltage difference between the first and second electrodes, so that the first particles take the decelerated motion towards the direction of the second electrode and are avoided being excessively impacted or attached to the second electrode.
Description
Technical field
The present invention mainly discloses a kind of driving method of display unit, is meant a kind of charged particle driving method that can protect this display unit and increase contrast especially.
Background technology
Art technology is based on to be had within the enclosure space that two electrodes and compartment form; It is transparent having an electrode at least; And the charged particle that can have at least a color within this space; Put on different voltage swings and polarity above two electrodes via adjustment, it is improved to produce electric field, is exemplified below now:
Please refer to Fig. 1, it is the driving method synoptic diagram of a kind of display unit of known technology and this display unit.Known technology has two kinds of slightly variant driving methods, shown in Fig. 1 upper and lower half, is earlier that example proposes explanation with the first half for describing convenient this instructions respectively.As graphic; Display unit 1 comprises one first electrode 11, one second electrode 13, one first particle 15 and one second particle 17 at least, and wherein this first electrode 11 and this second electrode 13 keep this one suitably not busy apart from this first particle 15 and this second particle 17 are filled in this first electrode 11 and this second electrode 13 and the defined accommodation space of device body (not illustrating) each other.Through applying a voltage to this first electrode 11 and second electrode 13 at the same time or separately; Make 13 at this first electrode 11 and second electrode produce a voltage difference (or electric field) V2; Thereby drive 17 motions of this first particle 15 and this second particle; In this example, this first particle 15 is to move towards this second electrode 13, and this second particle 17 is to move towards this first electrode 11.
Please continue to consult Fig. 1, the driving method of known technology can be done driving with the mode of PWM for asking better comparing result, and time, ratio and the Pulse number of adjustment ON/OFF reach required contrast.Hope is within the time of ON, and the electric field energy that is applied moves by particle, and within the time of OFF; Close voltage; Let particle influenced by external electrical field, can move on, till energy disappears with the energy that within the time of ON, is obtained.In like manner; For the said driving method of Fig. 1 Lower Half; Then be earlier in first electrode 11 and 13 generations one of second electrode and the reverse one voltage difference-V1 of aforementioned V2; Drive this first particle 15 and move toward these second electrode, 13 places, and this second particle 17 moves toward these first electrode, 11 places from this second electrode 13 from this first electrode 11.Certainly, the said driving method of Fig. 1 Lower Half is still done driving with the mode of PWM, and the adjustment ON/OFF time, ratio and Pulse number reach required contrast, all the other are made flowing mode and then repeat no more.
Hold the above, the mode that let energy disappear has three kinds at least: (1) particle and interparticle interaction force influence and stop; (2) clash into other particle or electrode panel wall and stop; And the medium interaction power in (3) and two electrodes and the formed confined space of compartment and stop and because of the relation of particle self character, reference position, distribution consistency degree, attractive force and repulsive interaction; Usually can apply single and make a long driver the Pulse of moving time and change the mode that repeatedly drives Pulses of adopting; Overcome these variablees; Make to drive after the end that particle can stop on an other termination electrode, and evenly distribute.Therefore the time of ON long more, the energy that particle obtained is also big more, this energy produces three kinds of phenomenons on particle: (1) particle is also moving, the energy that within the time of ON next time, is obtained can let particle continue acceleration to advance; (2) particle presents stationary state, and contacts with electrode, and the energy that within the time of ON next time, is obtained can let particle continue to push to electrode direction; And (3) if the particle that opposed polarity arranged within the same space; This moment might opposed polarity particle after last driving end once, just attract each other; And the energy that within the time of ON next time, is obtained can balance out the interparticle power of attracting each other; Let particle separately, go to corresponding electrode.And within the time of OFF, electric field can stop the acting force to particle, lets particle continue to move on or to move with other particle and interelectrode interaction force with the energy that is obtained in the time from ON to reach stable status.
Yet above-mentioned three kinds of phenomenons all have following several kinds of disappearances: the energy shortage that (1) was obtained within the time of ON and let particle overcome between particle or the interaction force of electrode; (2) particle high speed bump electrode, or clash into other particle, cause particle position skew or bounce-back, and the permanent damage of particle and electrode; And (3) particle constantly can cause deformation own by the electric field extruding, and contacts area between electrode and becomes big, causes electrode or this body structure of particle or charged characteristic to change.
Fig. 2 A, 2B and 2C are respectively known technology three kinds of driving method synoptic diagram commonly used.See also Fig. 2 A, known technology (1) uses the driving method of the single Pulse of longer ON time, can let particle at full throttle clash into other particle and electrode, and continues the extruding particle, and this might cause the permanent damage of particle and electrode.
See also Fig. 2 B; Known technology (2) uses the driving method of the many Pusles of shorter ON time; Fixedly the ratio of ON/OFF time lets particle advance with lower energy, and within the time of OFF, lets particle and electrode interphase interaction that it is settled out.This method can be because need the long OFF time, so driving time can be longer.
See also Fig. 2 C, known technology (3) is that the time length of adjustment ON lets particle move quickly into the electrode of an other end, and it is consuming time to reduce driving.But the method can't be avoided the phenomenon of particle high speed bump particle and electrode.
Summary of the invention
Fundamental purpose of the present invention is to provide a kind of driving method of display unit; In the middle of the driving process; Provide one group with the ON driving time within the electric field of opposite polarity; Let particle within the time of OFF, obtain the anti-phase electric field: the energy of particle hits particle and electrode is lowered in (1), reduces loss, improves particle and electrode life; And (2) are when applying reverse voltage; The reversed electric field that provides reduces particle and particle and particle and interelectrode attractive force; Let particle be easier to receive the influence of other particle or interelectrode acting force and move; Therefore but do not allow particle to break away from electrode again, this acting force can let the particle alignment time shorter, more easily and more neat.Or let at ON within the time, the particle that on electrode, is squeezed can be replied original shape, reduces and interelectrode contact area.
Increase one group of reverse voltage/electric field with ON in the driving process newly, cooperate the type of drive of single/many Pulses again, can significantly reduce drive consuming time; Reduce particle hits and distortion; Improve serviceable life, and particle alignment is more neat, obtains higher contrast.
Description of drawings
Fig. 1 is the driving method synoptic diagram of a kind of display unit of known technology and this display unit;
Fig. 2 A, 2B and 2C are respectively known technology three kinds of driving method synoptic diagram commonly used;
Fig. 3 is the driving method synoptic diagram of a kind of display unit of the present invention and this display unit;
Fig. 4 A and 4B are respectively two kinds of driving method synoptic diagram of display unit shown in Figure 3;
Fig. 5 is for using the relative known technology driving method of driving method of the present invention, the comparison chart on contrast and driving time; And
Subordinate list one, two and three is respectively and uses the relative known technology driving method of driving method of the present invention, at the comparison sheet of driving time, contrast and experimental data such as consuming time.
[main element label declaration]
Second electrode, 13,23 first particles 15,25
Embodiment
Fig. 3 is the driving method synoptic diagram of a kind of display unit of the present invention and this display unit.As shown in the figure, the present invention is mainly used in the technical field of display unit, and display unit for example is the similar device of Electronic Paper or the charged demonstration particle of tool.The present invention provides two kinds of slightly variant driving methods equally, is illustrated in upper and lower half mode chart and the corresponding display device synoptic diagram of Fig. 3 respectively, is example with the driving method shown in Fig. 3 first half earlier for ease of explaining.
Shown in Fig. 3 first half.Display unit 2 comprises one first electrode 21 and one second electrode 23 that is oppositely arranged and keeps a distance at least.And have in this first electrode 21 and this second electrode 23 and the enclosure space that display device 2 bodies are defined jointly two kinds with different electrically and the particles of color; Different in this embodiment electrical particles for example are first particle 25 and second particle 27; For the ease of signal; Various particles only illustrate one, explanation hereby.Wherein, this first particle 25 for example is that white is electronegative, and this second particle 27 for example is the black positively charged.It is transparent that this display unit 2 has one side at least; Can let light penetration come in; Surface reflection via the different colours particle is gone back; So near the distribution of particles number and the color of penetration surface, will let display unit 2 demonstrate various colors or shade of gray, this transparent area for example is the face at first electrode, 21 places in this embodiment.Stationary state before driving; This first particle 25 for example is that part is attached on this first electrode 21; This second particle 27 for example is that part is attached on this second electrode 23; And the state that Fig. 3 first half (and Lower Half) is illustrated is direction of motion and the position that drives particle after the beginning, detailed as after state.
Changing particle position then is applied to voltage swing on each electrode, is held time and polarity etc. decides by adjustment.In the present embodiment, for example ought apply negative electricity, and apply positive electricity at second electrode 23 at first electrode 21; Can form a voltage difference (or electric field) V2 this moment; This voltage difference V2 intensity is once be adsorbed on the attractive force of electrode greater than particle, and particle and interparticle attractive force, will let particle begin to move along electric field; This moment, former part was attached at second particle 27 on second electrode 23, can begin toward first electrode 21 near (or moving); Otherwise former part is attached at first particle 25 on first electrode 21, then begins toward second electrode 23 near (or moving).This moment, the user was seemed to demonstrate black by the transparent area outside of first electrode 21, and vice versa.Therefore; Let particle begin to move, electric field intensity just is greater than the formed attractive force of particle and electrode at least, and applying voltage just must be enough big; And greater than this limit voltage (Threshold Voltage) afterwards; Particle can begin to receive electric field effects and charged size itself, forms a kind of thrust and begins to move, and adds the influence (Fe=qE=ma of the time that applies voltage; V=at), close apply voltage after, particle itself can continue flight according to the last speed that obtains, up to: (1) receives being decelerated to the interaction force influence of other particle and stops; Or (2) are directly clashed into electrode and are stopped.
Above-mentioned first kind of mode is because be the influence of contactless force; For not having too big influence on the particle self character, still this relative repulsion or attractive force have an opportunity to let particle change mobile route, cause confusion; Whether can marshalling, and relative position if having influence on particle.
The above-mentioned second way is come directly bump electrode because be with high relatively speed; Energy can have influence on particle and electrode relatively in bump; May cause the permanent destruction on the own physics material of particle and electrode, and can on surface of contact, produce electrical neutralization to a certain degree during the particle contact electrode, can let the particle charged characteristic receive influence slightly; And can let when directly clashing into particle produce deformation; Cause becoming big with interelectrode contact area, electrically the zone of neutralization also becomes greatly, and the particle charged characteristic can receive bigger influence.And after the particle multiple impact electrode; Can produce with property destruction of a specified duration electrode; Influence the intensity that electric field produces; Even this impinging upon on the softer panel material (Flexible type) can produce concussion, and the seismic wave of concussion might have influence on the particle alignment result of other viewing area or produce the sound.
The main occurrence cause of these problems be exactly known technology at particle in moving process; Adopt particle interaction power and directly the bump electrode do the action that stops to move, and electric field intensity is when not enough, the particle flying distance is not enough; Or energy shortage; Can't push out other particle on electrode, arrangement will be irregular, causes degradation in contrast.Chat like preface and use bigger driving electric field to have problems.The present invention mainly is used for improving these shortcomings, narrates as follows now:
Please consult Fig. 3,4A and 4B simultaneously, wherein Fig. 4 A and 4B are respectively two kinds of driving method synoptic diagram of display unit shown in Figure 3.As shown in the figure, E1/Eb/E2 is represented as respectively because the electric field intensity that two electrodes 21 and 23 different voltages are produced, and positive negative value is then represented direction of an electric field or voltage difference numerical value, and present embodiment is V2/-V1.Ton/Toff_1/Toff_2/Tbreak then represents the electric field application time.Therefore, be example with Fig. 3 first half, driving method provided by the invention comprises the following steps: at least
(1) applies one first voltage difference V2 in this first and second electrode 21, between 23, so that this first particle 25 moves towards these second electrode, 23 directions;
(2) stop to apply this first voltage difference V2; And
(3) apply second voltage difference-V1 between this first electrode 21 and second electrode 23, the polarity of this second voltage difference-V1 and this first voltage difference V2 is opposite, does retarded motion so be able to drive this first particle 25 towards these second electrode, 23 directions.
Wherein in above-mentioned steps (1), (2), (3); Still can do identical driving to second particle 27 simultaneously; And second particle 27 is electrically opposite with first particle 25, thus the mode of motion that is appeared in above-mentioned steps (1), (2), (3), all should corresponding first particle, 25 phases on the contrary for it.In addition; When applying first and second voltage difference V2/-V1; All can comprise applying those potential difference (PD) V2/-V1 separately, or apply different potentials and make its sum voltage difference reach required polarity and numerical value in this first electrode 21 and second electrode 23 in this first electrode 21 or this second electrode 23.Moreover; Above-mentioned steps (3) is if controls such as, times poor through appropriate voltage; Can make this first particle 25 after motion, gently lean on, stop or part is attached at this second electrode 23; And can make second particle 27 after motion, gently lean on, stop or part is attached at this first electrode 21, therefore reach the effect that protection particle and electrode avoid suffering impact wreckage.Above-mentioned multiple operation, all should be the industry practitioner can think and the person easily, so do not give unnecessary details.
Hold the above, main characteristics of the present invention is, increases newly a kind of and the reversed electric field driving electric field of Ton within the time, and let particle 25 and 27 obtain one group of adjustable contactless reacting force and come: slow down (1); And particle and particle or particle and the interelectrode power of attracting each other are reduced in (2).This group opposite electric field application time, electric field intensity, apply that number of times can be accordinged to required reflectivity, the external appointed condition of two electrode gap, particle material characteristic, particle reference position, temperature or the like adjusts up and down.And can cooperate the driving method of single/many Pulse outputs to reach more display result.
See also Fig. 5, for using the relative known technology driving method of driving method of the present invention, the comparison chart on contrast and driving time.Below be the experimental data chart of Fig. 5:
(1) two group of test condition is Pulse number=20, exports 20 Pulse continuously, and Ton is 100 μ s, and wherein μ s refers to the microsecond of chronomere.
(2) wherein Fig. 5 top line is a driving method of the present invention, and its Toff_1 is 150 μ s, does not export reverse voltage.
(3) wherein Fig. 5 below line is the driving method of known technology, and its Toff_1 is 0 μ s, and Tbreak is 50 μ s, and Toff_2 is 10 μ s.
Chart by Fig. 5 can be known; After using driving method of the present invention, within the same time, can obtain better contrast, and use the present invention also can obtain higher contrast; That is to say that the present invention not only can promote contrast, and can also save many times.In addition, also can consult subordinate list one, two and three, it is respectively and uses the relative known technology driving method of driving method of the present invention, at the comparison sheet of driving time, contrast and experimental data such as consuming time.Also can verify above-mentioned saying by those subordinate lists, sequitur driving method provided by the invention has the better display effect of relative known technology.
Though the present invention discloses as above with preferred embodiment; Right its is not that any those skilled in the art are not breaking away from the spirit and scope of the present invention in order to qualification the present invention; When can doing various changes and retouching, so protection scope of the present invention is as the criterion when looking the accompanying claims scope person of defining.
Claims (13)
1. the driving method of a display unit; This display unit comprises one first electrode and one second electrode that is oppositely arranged and keeps a distance; And one first particle of tool polarity, this first particle diffusion is between this first electrode and second electrode, and wherein this driving method may further comprise the steps:
Apply one first voltage and be worse than between this first and second electrode, so that this first particle moves towards this second electrode direction;
Stop to apply this first voltage difference; And
Apply one second voltage and be worse than between this first electrode and second electrode, the polarity of this second voltage difference and this first voltage difference is opposite, does retarded motion to drive this first particle towards this second electrode direction.
2. driving method according to claim 1, wherein apply this first voltage difference before, this first particle partly is attached on this first electrode.
3. driving method according to claim 1, wherein this first particle is driven by this first voltage difference, moves with uniform velocity or acceleration towards this second electrode direction.
4. driving method according to claim 1 wherein applies this first voltage difference and comprises that applying this current potential separately is worse than this first electrode or this second electrode, or applies different potentials in this first electrode and second electrode.
5. driving method according to claim 1 wherein applies this second voltage difference and comprises that applying this current potential separately is worse than this first electrode or this second electrode, or applies different potentials in this first electrode and second electrode.
6. driving method according to claim 1 also comprises the surface that makes this first particle stop and being attached at this second electrode.
7. driving method according to claim 1, wherein this first particle is that white is electronegative.
8. driving method according to claim 1 wherein also comprises one second particle diffusion between this first electrode and second electrode, this second particle and this first particle tool opposed polarity.
9. driving method according to claim 8 also comprises the surface that makes this second particle stop and being attached at this first electrode.
10. driving method according to claim 8, wherein this second particle is the black positively charged.
11. driving method according to claim 8, wherein apply this first voltage difference before, this second particle partly is attached on this second electrode.
12. driving method according to claim 11, wherein this first voltage difference is enough to overcome the attractive force that this first particle or second particle receive this first electrode or second electrode.
13. driving method according to claim 12, wherein this first voltage difference is greater than limit voltage.
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| CN2010102546197A CN102376256A (en) | 2010-08-10 | 2010-08-10 | Driving method of display unit |
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| CN2010102546197A CN102376256A (en) | 2010-08-10 | 2010-08-10 | Driving method of display unit |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20020005832A1 (en) * | 2000-06-22 | 2002-01-17 | Seiko Epson Corporation | Method and circuit for driving electrophoretic display, electrophoretic display and electronic device using same |
| CN1965342A (en) * | 2004-03-01 | 2007-05-16 | 皇家飞利浦电子股份有限公司 | Method of increasing image bi-stability and grayscale accuracy in an electrophoretic display |
| US7230604B2 (en) * | 2000-09-08 | 2007-06-12 | Fuji Xerox Co., Ltd. | Display medium driving method |
| CN101556767A (en) * | 2009-05-14 | 2009-10-14 | 福建华映显示科技有限公司 | Method for driving electrophoresis display unit |
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2010
- 2010-08-10 CN CN2010102546197A patent/CN102376256A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020005832A1 (en) * | 2000-06-22 | 2002-01-17 | Seiko Epson Corporation | Method and circuit for driving electrophoretic display, electrophoretic display and electronic device using same |
| US7230604B2 (en) * | 2000-09-08 | 2007-06-12 | Fuji Xerox Co., Ltd. | Display medium driving method |
| CN1965342A (en) * | 2004-03-01 | 2007-05-16 | 皇家飞利浦电子股份有限公司 | Method of increasing image bi-stability and grayscale accuracy in an electrophoretic display |
| CN101556767A (en) * | 2009-05-14 | 2009-10-14 | 福建华映显示科技有限公司 | Method for driving electrophoresis display unit |
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Application publication date: 20120314 |