CN103247267A - Electrowetting display and driving method thereof - Google Patents
Electrowetting display and driving method thereof Download PDFInfo
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- CN103247267A CN103247267A CN2012101037837A CN201210103783A CN103247267A CN 103247267 A CN103247267 A CN 103247267A CN 2012101037837 A CN2012101037837 A CN 2012101037837A CN 201210103783 A CN201210103783 A CN 201210103783A CN 103247267 A CN103247267 A CN 103247267A
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- 238000010586 diagram Methods 0.000 description 22
- 238000002310 reflectometry Methods 0.000 description 20
- 239000000976 ink Substances 0.000 description 18
- 230000005684 electric field Effects 0.000 description 8
- 238000009413 insulation Methods 0.000 description 8
- 230000002209 hydrophobic effect Effects 0.000 description 4
- 239000011521 glass Substances 0.000 description 3
- 230000035484 reaction time Effects 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 238000009736 wetting Methods 0.000 description 3
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
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- 230000008602 contraction Effects 0.000 description 1
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Abstract
An electrowetting display and a driving method thereof. The driving method comprises the following steps: and correspondingly determining the total pulse width of the pixel in the image frame according to the target gray scale of the pixel. And driving the pixel using a drive signal having a plurality of drive pulses in an image frame. The sum of the pulse widths of the driving pulses is consistent with the total pulse width, and the driving pulses are not adjacent to each other in time. Therefore, the gray scale display contrast of the pixel can be improved.
Description
Technical field
The disclosure relates to a kind of display, and is particularly related to moistening (Electrowetting) display of a kind of electricity and driving method thereof.
Background technology
In recent years, electric wet-type display (Electrowetting) more and more received the concern of each international big factory because of the advantage of its low-power, high reaction time and high reflectance.Electric wet-type display is a kind of display of simple structure.Pixel by whether to electric wet-type display applies electric field, and electric wet-type display can change the distribution of the inner printing ink of pixel, and then the control pixel presents bright attitude or dark attitude.After electric field disappeared, printing ink can only rely on interface tension force to return back to stable state naturally.When therefore electric field disappeared, the printing ink reaction time was slow relatively, adds the influence of the some electric charges that residue in pixel inside, had caused the GTG contrast of electric wet-type display pixel not good.
Summary of the invention
Disclosure embodiment proposes a kind of driving method of electric wet-type display, comprises the steps.According to the target gray scale of pixel (pixel), determine the total pulsewidth of this pixel in picture frame (Frame, picture frame are referred to as " picture frame " again) accordingly.Use this pixel of drive.Wherein, this driving signal has a plurality of driving pulses in this picture frame, and the pulsewidth summation of these driving pulses meets this total pulsewidth, and these driving pulses are gone up not adjacent to each other connecing in the time.
Disclosure embodiment proposes a kind of electric wet-type display, comprises electric moistening display unit and control module.The moistening display unit of electricity has at least one pixel.Control module is coupled to electric moistening display unit.Control module determines the total pulsewidth of this pixel in picture frame accordingly according to target gray scale, and uses this pixel of drive.Wherein, this driving signal has a plurality of driving pulses in this picture frame, and the pulsewidth summation of these driving pulses meets this total pulsewidth, and these driving pulses are gone up not adjacent to each other connecing in the time.
Disclosure embodiment proposes a kind of driving method of electric wet-type display, comprises the steps.According to the target gray scale of pixel, determine the total area of drive waveforms in picture frame of this pixel accordingly.Use this pixel of drive.Wherein, this driving signal has a plurality of driving pulses in this picture frame.Drive in the oscillogram of signal at this, the area summation of these driving pulses meets this total area, and these driving pulses are gone up not adjacent to each other connecing in the time.
Disclosure embodiment proposes a kind of electric wet-type display, comprises electric moistening display unit and control module.The moistening display unit of electricity has at least one pixel.Control module is coupled to the moistening display unit of this electricity.Control module determines the total area of drive waveforms in picture frame of this pixel accordingly according to target gray scale, and uses this pixel of drive.Wherein, this driving signal has a plurality of driving pulses in this picture frame.Drive in the oscillogram of signal at this, the area summation of these driving pulses meets this total area, and these driving pulses are gone up not adjacent to each other connecing in the time.
For above-mentioned feature and advantage of the present disclosure can be become apparent, embodiment cited below particularly, and conjunction with figs. is described in detail below.
Description of drawings
Figure 1A is the diagrammatic cross-section of pixel (pixel) 100 in explanation electricity moistening (Electrowetting) display.
Figure 1B is the diagrammatic cross-section of pixel 100 in the explanation electric wet-type display.
Fig. 2 is the function block schematic diagram that a kind of electric wet-type display 200 is described according to disclosure embodiment.
Fig. 3 is the synoptic diagram that concerns that the driving signal DS waveform of pixel shown in Figure 1A 100 and average reflectance (average reflectance) are described according to disclosure embodiment.
Fig. 4 is the synoptic diagram that concerns that the driving signal DS waveform of pixel shown in Figure 1A 100 and reflectivity and average reflectance are described according to disclosure embodiment.
Fig. 5 A illustrates that according to the disclosure embodiment control module produces the synoptic diagram of driving pulse according to total pulsewidth.
Fig. 5 B is the driving method process flow diagram that electric wet-type display 200 is described according to disclosure embodiment.
Fig. 6 illustrates that according to the disclosure embodiment control module produces the synoptic diagram of driving pulse according to total pulsewidth.
Fig. 7 A illustrates that according to the disclosure embodiment control module produces the synoptic diagram of driving pulse according to the total area.
Fig. 7 B is the driving method process flow diagram that electric wet-type display 200 is described according to disclosure embodiment.
Fig. 8 is the enlarged diagram of driving pulse 710 shown in the key diagram 7A.
Fig. 9 illustrates the synoptic diagram that drives signal according to disclosure embodiment.
[main element symbol description]
100: pixel
110: glass substrate
120: following plate electrode
130: insulation course
140: hydrophobic layer
150: printing ink
160: water
170: upper plate electrode
200: electric wet-type display
210: control module
220: electric moistening display unit
DS: drive signal
301,302,402,407: curve
303,403: the distributing drive waveforms
304,404: the continous way drive waveforms
FRM: picture frame
G1～G8: GTG
401: pixel is jumped the ink-covered area
405,406: reflectivity curve
S520, S540, S702, S704: the step of driving method
501～507,601,605,701,720,730,740: driving pulse
501w, 502w, 503w, 601w, 605w: total pulsewidth
504w～507w, 602w～604w: pulsewidth
504h～507h, 602h～604h: voltage swing
602,604: positive driving pulse
603: negative driving pulse
606: the distributing drive waveforms
711～713: during the son
901,904: exchange disturbance voltage
902,903: the replacement frame
Embodiment
The disclosure provides moistening (Electrowetting) display of a kind of electricity and driving method thereof, under the situation that does not increase driving time, to drive the pixel of electric moistening display unit with distributing digital gray level type of drive, in order to reduce the accumulation of electric charge on insulation course, the GTG that effectively promotes pixel shows contrast.
Figure 1A and Figure 1B illustrate the diagrammatic cross-section of pixel (pixel) 100 in electricity moistening (Electrowetting) display.The structure of pixel 100 is glass substrate 110, following plate electrode 120, insulation course (insulator layer) 130, hydrophobic layer (hydrophobic layer) 140, printing ink 150, water 160 and upper plate electrode 170 shown in Figure 1A in regular turn in the electric wet-type display.When not applying electric field, printing ink 150 is covered with insulation course 130 surfaces (hydrophobic layer 140), shown in Figure 1A.Printing ink 150 can absorb incident light and make pixel 100 present dark attitude.When applying a voltage to upper plate electrode 170 and following plate electrode 120, electric field between upper plate electrode 170 and the following plate electrode 120 will make printing ink 150 shrink, as shown in Figure 1B, this moment, glass substrate 110 can reflect (or transmission) incident light, and then made pixel 100 present bright attitude.After electric field disappeared, printing ink 150 can only rely on interface tension force to return back to stable state (from replying state shown in Figure 1B to state shown in Figure 1A) naturally.
Fig. 2 is the function block schematic diagram that a kind of electric wet-type display 200 is described according to disclosure embodiment.Electric wet-type display 200 comprises control module 210 and electric moistening display unit 220.The moistening display unit 220 of electricity has at least one pixel, for example pixel 100 shown in Figure 1A and Figure 1B.Control module 210 is coupled to electric moistening display unit 220, drives signal DS driving pixel 100 and other pixels in order to use.Control module 210 determines the total driving energy of pixel 100 in picture frame (frame) in the electric moistening display unit 220 accordingly according to target gray scale.Next, control module 210 is dispersed to described total driving energy during a plurality of drivings in the picture frame, goes up not adjacent to each other connecing in the time during wherein these drive.
Present embodiment does not limit described total driving energy is dispersed to the means during a plurality of drivings in the picture frame.For example, control module 210 can determine the total pulsewidth of pixel 100 in picture frame accordingly according to target gray scale, and dispose a plurality of driving pulses to the picture frame of described driving signal DS, wherein the pulsewidth of these driving pulses in same picture frame (pulse width) summation meets this total pulsewidth, and these driving pulses are gone up not adjacent to each other connecing in the time.These realization means will be in describing in detail for example after a while.
Again for example, control module 210 can determine the total area of drive waveforms in a picture frame of the driving signal DS of pixel 100 accordingly according to the target gray scale of pixel 100.Control module 210 can use and drive signal DS driving pixel 100, wherein drives signal DS and have a plurality of driving pulses in this picture frame.In the oscillogram that drives signal DS, the area summation of these driving pulses in same picture frame meets this total area, and these driving pulses are gone up not adjacent to each other connecing in the time.These realization means will be in describing in detail for example after a while.
Fig. 3 is the synoptic diagram that concerns that the driving signal DS waveform of pixel shown in Figure 1A 100 and average reflectance (average reflectance) are described according to disclosure embodiment.Fig. 3 is divided into three parts.The top of Fig. 3 illustrate control module 210 according to the target gray scale of pixel 100 the corresponding continous way drive waveforms 304 that determines.The bottom of Fig. 3 illustrates the average reflectance of pixel 100.Give the dark attitude of pixel 100 except not applying voltage, present embodiment has defined 8 GTG G1～G8.If the target gray scale of pixel 100 is G1, then control module 210 determines that accordingly total pulsewidth of pixel 100 is 1/8 of picture frame FRM.Continous way drive waveforms 304 has illustrated total pulsewidth has been divided into two continuous positive pulses and negative pulse, and wherein the pulsewidth of positive pulse and negative pulse all is 1/16 of a picture frame FRM.By that analogy, if the target gray scale of pixel 100 is G2, then control module 210 determines that accordingly total pulsewidth of pixel 100 is 2/8 of picture frame FRM.If the target gray scale of pixel 100 is G3, then control module 210 determines that accordingly total pulsewidth of pixel 100 is 3/8 of picture frame FRM.If the target gray scale of pixel 100 is G8, then control module 210 determines that accordingly total pulsewidth of pixel 100 is 8/8 of picture frame FRM.
By adjusting drive waveforms dutycycle (duty cycle), control module 210 can make pixel 100 present different average reflectances, and then can present different GTG impressions.Ideally, the continous way drive waveforms 304 of different GTG G1～G8 should be able to make pixel 100 present as the average reflectance of certain contrast is arranged as the curve 301.Yet in fact, if control module 210 drives pixels 100 with continous way drive waveforms 304, the continous way drive waveforms 304 of different GTG G1～G8 should be able to make pixel 100 present as the curve 302 to lower average reflectance.Very responsive for electric field because of the electric wet-type display structure, it is but slow relatively that printing ink 150 returned back to reaction time of stable state shown in Figure 1A when electric field disappeared, and adds that some electric charges residue in the influence of insulation course 130, makes that the reflectivity decline rate is slow than ascending velocity.Asymmetric rise time like this and cause fall time the GTG contrast of electric wet-type display wayward.Clearly, compared to curve 301, the contrast of GTG that curve 302 presents is relatively poor.
The middle part of Fig. 3 illustrate control module 210 according to the target gray scale of pixel 100 corresponding distributing (distributed) drive waveforms 303 that determines.In the present embodiment, control module 210 determines then described total driving energy to be dispersed to the total driving energy of pixel 100 in picture frame FRM during a plurality of drivings among the picture frame FRM according to target gray scale accordingly.For example, control module 210 determines accordingly that according to target gray scale G1 the total pulsewidth of pixel 100 in picture frame FRM is 1/8 of a picture frame FRM.Next, please refer to the distributing drive waveforms 303 at Fig. 3 middle part, control module 210 is divided into positive pulse and negative pulse with total pulsewidth, and above-mentioned positive pulse and negative pulse not adjacent to each other connecing on the time.The pulsewidth summation of above-mentioned positive pulse and negative pulse meets total pulsewidth (namely 1/8 of a picture frame FRM) of this target gray scale.
The disclosed distributing drive waveforms 303 of present embodiment is continous way drive waveforms 304 to be disassembled be a plurality of parts in identical driving time (picture frame FRM), utilize the mode of energy dispersive to reduce the accumulation of electric charge on insulation course 130, to increase the GTG contrast of electric wet-type display under the condition of identical driving time.In response to the architectural characteristic of electric wet-type display, distributing drive waveforms 303 can disperse ink 150 times of shrinking, and disperse the accumulated time of electric charge on insulation course 130, to reduce the semi-invariant of electric charge on insulation course 103.Therefore, the distributing drive waveforms 303 of different GTG G1～G8 can make pixel 100 present average reflectance shown in curve 301.The GTG that distributing drive waveforms 303 can effectively promote pixel 100 shows contrast.
Fig. 4 is the synoptic diagram that concerns that the driving signal DS waveform of pixel shown in Figure 1A 100 and reflectivity and average reflectance are described according to disclosure embodiment.Fig. 4 is divided into three parts, top illustrated control module 210 according to the target gray scale of pixel 100 the corresponding continous way drive waveforms that determines 404 and distributing drive waveforms 403.Part has illustrated the reflectivity of pixel 100 among Fig. 4, and wherein reflectivity curve 405 corresponds to continous way drive waveforms 404, and reflectivity curve 406 corresponds to distributing drive waveforms 403.Fig. 4 lower part has illustrated the average reflectance of pixel 100, and wherein curve 402 corresponds to reflectivity curve 405, and curve 407 corresponds to reflectivity curve 406.
Be example when being G3 with target gray scale, pixel 100 receives continous way drive waveforms 404, and produces corresponding reflectivity curve 405, and this reflectivity curve 405 produces the effect of pixel intensity with equaling curve 402.It should be noted that therefore reflectivity curve 405 crests that produce are comparatively concentrated because positive pulse and negative pulse in the continous way drive waveforms 404 are continuous.And, because the crest of reflectivity curve 405 is comparatively concentrated, makes the reflectivity of reflectivity curve 405 be added up and enter pixel and jump ink-covered area 401.When the reflectivity of pixel 100 enters pixel when jumping the ink-covered area, the contraction of expression printing ink 150 surpasses a critical value, makes printing ink 150 can leak other pixels of neighborhood pixels 100 to the electric wetting display unit 220, and then influences the display quality of electric wetting display unit 220.Below deserve to be called and state printing ink 150 and leak to the situation of other pixels and be " pixel is jumped China ink ".
On the other hand, the distributing drive waveforms 403 of present embodiment can produce corresponding reflectivity curve 406 in pixel 100, and this reflectivity curve 406 produces the effect of pixel intensity with equaling curve 407.It should be noted that the disclosure is that energy with continous way drive waveforms 404 is distributed to a plurality of driving pulses (as distributing drive waveforms 403), and these driving pulses non-conterminous connecing in time.Because positive pulse and negative pulse adjacency not each other on the time in the distributing drive waveforms 403, therefore also adjacency not of reflectivity curve 406 crests that produce makes reflectivity curve 406 can't enter pixel jumping ink-covered area 401.Therefore, compared to curve 402, curve 407 has GTG contrast preferably except making pixel 100, can also avoid pixel 100 to produce the situation that pixel is jumped China ink.
Below more illustrate that with embodiment control module 210 produces each step that drives signal DS in the disclosure.The energy of above-mentioned continous way drive waveforms can be represented with the area of pulsewidth or drive waveforms, be described in detail as follows.
Fig. 5 A illustrates that according to the disclosure embodiment control module produces the synoptic diagram of driving pulse according to total pulsewidth.Fig. 5 A is divided into two parts, and explanation control module 210 in top is according to total pulsewidth of the corresponding decision of target gray scale institute of pixel 100.Fig. 5 A lower part illustrate control module 210 according to the target gray scale of pixel 100 the corresponding drive waveforms that determines, control module 210 drives pixel 100 with the drive waveforms of Fig. 5 A lower part as a part that drives signal DS in the present embodiment.Fig. 5 B is the driving method process flow diagram that electric wet-type display 200 is described according to disclosure embodiment.
In step S520, be example when being G1 with target gray scale, control module 210 determines total pulsewidth 501w of pixel 100 driving pulse 501 in picture frame FRM accordingly according to target gray scale G1, total pulsewidth 501w is 1/8 of a picture frame FRM.Driving pulse 501 is a kind of continous way drive waveforms herein.
In step S540, it is example when being G1 with object pixel equally, control module 210 uses driving signal DS to drive pixel 100, wherein drive signal DS and in picture frame FRM, have a plurality of driving pulses, the pulsewidth summation of these driving pulses meets overall pulse 501w, and these driving pulses are gone up not adjacent to each other connecing in the time.Detailed says, control module 210 produces driving pulse 504 and driving pulse 505 according to total pulsewidth 501w, and driving pulse 504 is gone up not adjacent to each other connecing with driving pulse 505 in the time.Wherein, driving pulse 504 all is wavelet shape with driving pulse 505, that is to say that driving pulse 501 is to be broken up into a plurality of non-conterminous wavelet shapes that connect, and disperses the energy of driving pulse 501 by this.In other words, the waveform formed of driving pulse 504 and driving pulse 505 is a kind of distributed drive waveforms herein.Wherein pulsewidth 504w and voltage swing 504h correspond to driving pulse 504, and pulsewidth 505w and voltage swing 505h correspond to driving pulse 505.
Summation that it should be noted that pulsewidth 504w and pulsewidth 505w meets total pulsewidth 501w, and pulsewidth 504w and pulsewidth 505w and inequality.In Fig. 5 A illustrated embodiment, pulsewidth 505w is bigger than pulsewidth 504w.That is to say that the pulsewidth of driving pulse can increase gradually on time sequencing.Yet implementation of the present disclosure is not limited thereto.For example, in other embodiments, pulsewidth 505w is less than pulsewidth 504w, and the summation of pulsewidth 504w and pulsewidth 505w meets total pulsewidth 501w.And voltage swing 504h and voltage swing 505h's is big or small identical.Because the energy of a driving pulse is the product (area that also is equal to driving pulse) of pulsewidth and voltage swing, and driving pulse 504 is identical with the voltage swing of driving pulse 505, so pulsewidth 504w and 505w are representing the energy of driving pulse 504 and driving pulse 505 respectively.Therefore, control module 210 be energy (representing with total pulsewidth 501w) with driving pulse 501 be dispersed to district's artery dash 504 with driving pulse 505 on (its pulsewidth summation equals total pulsewidth 501w).That is to say that control module 201 resolves into a plurality of non-conterminous wavelet shapes (as driving pulse 504 and driving pulse 505) that connect to a continous way drive waveforms (as driving pulse 501), to produce a distributing drive waveforms.And for the above reasons, the distributing drive waveforms makes that the GTG contrast of pixel 100 is preferable, and can avoid pixel to jump the phenomenon of China ink.
The driving signal DS that control module 210 is used for driving pixel 100 has just comprised driving pulse 504 and driving pulse 505, uses making pixel 100 reach target gray scale G1.
Please continue the 5A with reference to figure, be example with GTG G2, and control module 210 determines the total pulsewidth 502w of pixel 100 in picture frame FRM accordingly according to the target gray scale G2 of pixel 100, and total pulsewidth 502w accounts for 2/8 of picture frame FRM.Control module 210 produces driving pulse 506 and driving pulse 507 according to total pulsewidth 502w, and driving pulse 506 is gone up not adjacent to each other connecing with driving pulse 507 in the time.Wherein the pulsewidth 506w of driving pulse 506 adds that the pulsewidth 507w of driving pulse 507 can meet total pulsewidth 502w.In Fig. 5 A illustrated embodiment, pulsewidth 507w is bigger than pulsewidth 506w.Yet implementation of the present disclosure is not limited thereto.For example, in other embodiments, pulsewidth 507w is less than pulsewidth 506w, and the summation of pulsewidth 506w and pulsewidth 507w meets total pulsewidth 501w.On the other hand, voltage swing 506h and voltage swing 507h's is big or small identical.The driving signal DS that control module 210 is used for driving pixel 100 has just comprised driving pulse 506 and driving pulse 507, uses making pixel 100 reach target gray scale G2.
All only comprise positive pulse in all driving pulses (501～503) among Fig. 5 A, but driving pulse also can comprise negative pulse in the disclosure.Below illustrate that with embodiment driving pulse comprises the situation of positive pulse and negative pulse.
Fig. 6 illustrates that according to the disclosure embodiment control module produces the synoptic diagram of driving pulse according to total pulsewidth.Fig. 6 is divided into two parts, and explanation control module 210 in top is according to total pulsewidth of the corresponding decision of target gray scale institute of pixel 100.Fig. 6 lower part illustrate control module 210 according to the target gray scale of pixel 100 the corresponding drive waveforms that determines, control module 210 drives pixel 100 with the drive waveforms of Fig. 6 lower part as driving signal DS in the present embodiment.
In step S520, be example when being G3 with target gray scale, control module 210 determines total pulsewidth 601w of pixel 100 driving pulse 601 in picture frame FRM accordingly according to target gray scale G3, total pulsewidth 601w accounts for 3/8 of picture frame FRM.It should be noted that the width of therefore total pulsewidth 601w representative comprises the width of positive pulse and negative pulse owing to comprise positive pulse and negative pulse in the driving pulse 601.On the other hand, the positive pulse in the driving pulse 601 and negative pulse go up adjacent to each other in the time, so driving pulse 601 belongs to a kind of continous way drive waveforms.
In step S540, it is example when being G3 with target gray scale equally, control module 210 uses driving signal DS to drive pixel 100, wherein drive signal DS and in picture frame FRM, have a plurality of driving pulses, the pulsewidth summation of these driving pulses meets overall pulse 601w, and these driving pulses are gone up not adjacent to each other connecing in the time.Detailed, control module 210 produces positive driving pulse 602, negative driving pulse 603 and positive driving pulse 604 according to total pulsewidth 601w, and positive driving pulse 602, negative driving pulse 603 and positive driving pulse 604 are not adjacent each other.Wherein, pulsewidth 602w and voltage swing 602h correspond to positive driving pulse 602; Pulsewidth 603w and voltage swing 603h correspond to negative driving pulse 603; Pulsewidth 604w and voltage swing 604h correspond to positive driving pulse 604.
Sum total that it should be noted that pulsewidth 602w, pulsewidth 603w and pulsewidth 604w meets total pulsewidth 601w.On the other hand, voltage swing 602h, voltage swing 603h and voltage swing 604h are mutually the same.Because the energy of a driving pulse is equivalent to pulsewidth and is multiplied by voltage swing, under the identical situation of voltage swing, the size of pulsewidth is equivalent to the size of driving pulse energy.That is to say that pulsewidth 602w, pulsewidth 603w and pulsewidth 604w represent the energy of positive driving pulse 602, negative driving pulse 603 and positive driving pulse 604 respectively.That is to say that control module 210 is that the energy with driving pulse 601 (continous way drive waveforms) disperses to produce the distributing drive waveforms by this on positive driving pulse 602, negative driving pulse 603 and the positive driving pulse 604.
It should be noted that in addition in the driving pulse (602～604) that control module 210 produces to comprise a positive driving pulse (602 and 604) at least, also comprise a negative driving pulse (603) at least.And the driving pulse quantity that belongs to positive pulse is inequality with the driving pulse quantity that belongs to negative pulse.
Please continue with reference to figure 6, be example when being G4 with target gray scale, and control module 210 determines total pulsewidth 605w of pixel 100 driving pulse 605 in picture frame FRM accordingly according to target gray scale G4, and total pulsewidth 605w is 4/8 of picture frame FRM.Control module 210 produces the distributing drive waveforms 606 that comprises a plurality of driving pulses according to total pulsewidth 605w.The driving pulse that produces when the pulsewidth characteristic of driving pulse is G3 with voltage swing characteristic and target gray scale in the distributing drive waveforms 606 is identical, does not give unnecessary details at this.What deserves to be mentioned is, comprise a positive driving pulse (3) and at least one negative driving pulse (1) in the distributing drive waveforms 606 at least, and it is inequality with the driving pulse quantity that belongs to negative pulse to belong to the driving pulse quantity of positive pulse.
According to the above, control module 210 is that the target gray scale according to pixel 100 decides the total pulsewidth of pixel 100 in picture frame.Therefore it should be noted that the shared area of driving pulse is that pulsewidth is multiplied by voltage swing, the size of pulsewidth also is proportional to the size of area under the identical situation of voltage swing.So among the above embodiment, control module 210 also can decide the total area of pixel 100 according to object pixel, and produces a plurality of driving pulses according to the total area.Yet the disclosure is not limited to the identical situation of voltage swing, below when inequality with the embodiment account for voltage amplitude of oscillation, control module 210 utilizes the total area to produce the step of driving pulse.
Fig. 7 A illustrates that according to the disclosure embodiment control module produces the synoptic diagram of driving pulse according to the total area.Fig. 7 A is divided into three parts, and explanation control module 210 in top is according to the total area of the corresponding decision of target gray scale institute of pixel 100; In part illustrate that control module 210 is according to the drive waveforms of the corresponding decision of the target gray scale of pixel 100 institute; Explanation control module 210 in lower part is according to another drive waveforms of the corresponding decision of target gray scale institute of pixel 100.Control module 210 drives pixel 100 according to the drive waveforms generation driving signal DS of part or lower part among Fig. 7 A.Fig. 7 B is the driving method process flow diagram according to disclosure embodiment explanation electric wet-type display 200.
In step S702, be example when being G1 with target gray scale, control module 210 determines the drive waveforms of pixel 100 in the total area of the driving pulse 701 of picture frame FRM accordingly according to target gray scale G1.It should be noted that since the area equivalent of driving pulse in the energy of driving pulse, so the energy of the total area representative of driving pulse 701 is for driving pixel 100 to the required energy of GTG G1.
In step S704, be that G1 is example with object pixel equally, control module 210 uses and drives signal DS driving pixel 100, wherein drive signal DS and in picture frame FRM, have a plurality of driving pulses, the area summation that belongs to driving pulse in the oscillogram that drives signal DS meets the total area of driving pulse 701, and these driving pulses are gone up not adjacent to each other connecing in the time.In detail, part in Fig. 7 A, control module 210 produces driving pulse 710 and driving pulse 720 according to the total area of driving pulse 701, wherein the area of driving pulse 710 adds that the area of driving pulse 720 equals the total area of driving pulse 701, and driving pulse 710 is gone up not adjacent to each other connecing with driving pulse 720 in the time.Specifically, driving pulse 710 also is continuous wave with driving pulse 720, that is to say, control module 701 will drive pixel 100 to the required energy of GTG G1 and represent with the total area of driving pulse 701 (continous way drive waveforms), and drive pixel 100 to the required energy distribution of GTG G1 to a plurality of non-conterminous driving pulses (710,720) that connect wavelet shape, produce the distributing drive waveforms by this.Just comprised driving pulse 710 and driving pulse 720 among the control signal DS, made pixel 100 be driven to target gray scale G1.
Fig. 8 is the enlarged diagram of driving pulse 710 shown in the key diagram 7A.Driving pulse 710 has comprised during the son 711, during the son 712 and son during 713.And, during the son 711, during the son 712 and son during 713 voltage different.Therefore, control module 210 not only produces a plurality of driving pulses (710 and 720) according to the total area of driving pulse 701, has more in each pulse (711～713) during a plurality of sons.And also comprise in the driving pulse 720 during a plurality of sons, identical during the son in its characteristic and the driving pulse 710, do not give unnecessary details at this.Therefore, even driving pulse 710 is continuous waves, but owing to wherein comprised during a plurality of sons, make that the energy of driving pulse 710 can be disperseed.
In Fig. 7 A lower part, control module 210 produces driving pulse 730 and driving pulse 740 according to the total area of driving pulse 701, wherein the area of driving pulse 730 adds that the area of driving pulse 740 equals the total area of driving pulse 701, and driving pulse 730 is gone up not adjacent to each other connecing with driving pulse 740 in the time.It should be noted that during the son in driving pulse 730 and the driving pulse 740 not adjacent in time.
According to the above, control module 210 determines pixel 100 in total pulsewidth or the total area of picture frame FRM according to the target gray scale of pixel 100 accordingly.And in a picture frame FRM, produce a plurality of driving pulses according to total pulsewidth or the total area.That is to say, control module 210 is according to total pulsewidth or the total area (pulsewidth and area all can represent the energy of this continous way drive waveforms) of a continous way drive waveforms, this continous way drive waveforms is resolved into a plurality of driving pulses (forming a distributing drive waveforms), and control module 210 uses distributed drive waveforms to drive pixel 100.
On the other hand, a plurality of driving pulses among the picture frame FRM correspond to an object pixel.Yet, driving among the signal DS and can comprise a plurality of picture frame FRM, the disclosure also adds a replacement frame (being referred to as " replacement frame " again) before picture frame FRM, below describe in detail with embodiment.
Fig. 9 illustrates the synoptic diagram that drives signal according to disclosure embodiment.According to foregoing, control module 210 produces a plurality of driving pulses (distributing drive waveforms) in each picture frame FRM.In addition, control module 210 also produces a replacement frame 902 before a picture frame FRM, drives signal DS and have an interchange disturbance voltage 901 in replacement frame 902.That is to say, include interchange disturbance voltage 901 in replacement frame 902, the replacement frame 903 respectively, exchange disturbance voltage 904.What deserves to be mentioned is that the interchange disturbance voltage 901 in the replacement frame can be urged to bright attitude with pixel 100, then control module 210 re-uses the distributing drive waveforms that the disclosure proposes pixel 100 is urged to a target gray scale.Each pixel in the wetting display unit 220 of electricity also adopts above-mentioned type of drive, and all pixels that control module 210 moistens electricity earlier in the display unit 220 use interchange disturbance voltage to be urged to bright attitude earlier, and then are urged to corresponding target gray scale separately.Thus, can promote the demonstration uniformity coefficient of electricity profit display unit 220, overcome because the processing procedure relation makes each pixel show inhomogeneous problem.
In sum, the electric wet-type display that the disclosure proposes and the driving method of electric wet-type display, because control module produces the last non-conterminous driving pulse that connects of a plurality of times according to object pixel and drives pixel, makes that the contrast of pixel is preferable, also avoids pixel to jump the situation of China ink.On the other hand, the disclosure adds before picture frame and exchanges disturbance voltage, makes that the display brightness of each pixel is more even in the electric moistening display.
Though the disclosure with embodiment openly as above; right its is not in order to limiting the disclosure, and those skilled in the art are not in breaking away from spirit and scope of the present disclosure; when doing a little change and retouching, so protection domain of the present disclosure is as the criterion when looking the appended claims person of defining.
Claims (24)
1. the driving method of an electric wet-type display comprises:
Target gray scale according to a pixel determines the total pulsewidth of this pixel in a picture frame accordingly; And
Use this pixel of a drive, wherein this driving signal has a plurality of driving pulses in this picture frame, and the pulsewidth summation of these driving pulses meets this total pulsewidth, and these driving pulses are gone up not adjacent to each other connecing in the time.
2. the driving method of electric wet-type display according to claim 1, wherein the voltage swing of these driving pulses is mutually the same, and has positive driving pulse and a negative driving pulse in these driving pulses at least.
3. as the driving method of electric wet-type display as described in the claim 2, the driving pulse quantity that wherein belongs to positive pulse in these driving pulses is inequality with the driving pulse quantity that belongs to negative pulse.
4. the driving method of electric wet-type display according to claim 1, wherein the voltage swing of these driving pulses is mutually the same, and the pulsewidth of these driving pulses is differing from each other.
5. the driving method of electric wet-type display according to claim 1 wherein has a replacement frame before this picture frame, and this driving signal has one and exchanges disturbance voltage in this replacement frame.
6. electric wet-type display comprises:
One electric moistening display unit has at least one pixel; And
One control module, be coupled to the moistening display unit of this electricity, this control module determines the total pulsewidth of this pixel in a picture frame accordingly according to a target gray scale, and use this pixel of a drive, wherein this driving signal has a plurality of driving pulses in this picture frame, the pulsewidth summation of these driving pulses meets this total pulsewidth, and these driving pulses are gone up not adjacent to each other connecing in the time.
7. electric wet-type display as claimed in claim 6, wherein the voltage swing of these driving pulses is mutually the same, and has positive driving pulse and a negative driving pulse in these driving pulses at least.
8. electric wet-type display as claimed in claim 7 wherein belongs to the driving pulse quantity of positive pulse with inequality in the driving pulse quantity of negative pulse in these driving pulses.
9. electric wet-type display as claimed in claim 6, wherein the voltage swing of these driving pulses is mutually the same, and the pulsewidth of these driving pulses is differing from each other.
10. electric wet-type display as claimed in claim 6 wherein has a replacement frame before this picture frame, and this driving signal has one and exchanges disturbance voltage in this replacement frame.
11. the driving method of an electric wet-type display comprises:
According to a target gray scale of a pixel, determine the total area of drive waveforms in a picture frame of this pixel accordingly; And
Use this pixel of a drive, wherein this driving signal has a plurality of driving pulses in this picture frame, the area summation that belongs to these driving pulses in the oscillogram of this driving signal meets this total area, and these driving pulses are gone up not adjacent to each other connecing in the time.
12. as the driving method of electric wet-type display as described in the claim 11, wherein the voltage swing of these driving pulses is mutually the same, and has positive driving pulse and a negative driving pulse in these driving pulses at least.
13. as the driving method of electric wet-type display as described in the claim 12, wherein belong to the driving pulse quantity of positive pulse in these driving pulses with inequality in the driving pulse quantity of negative pulse.
14. as the driving method of electric wet-type display as described in the claim 11, wherein the voltage swing of these driving pulses is mutually the same, and the pulsewidth of these driving pulses is differing from each other.
15. the driving method as electric wet-type display as described in the claim 11 wherein has a replacement frame before this picture frame, this driving signal has one and exchanges disturbance voltage in this replacement frame.
16. as the driving method of electric wet-type display as described in the claim 11, wherein arbitrary pulse has during a plurality of sons in these driving pulses, and the voltage of this pulse during this is a little is different.
17. as the driving method of electric wet-type display as described in the claim 11, wherein the voltage swing of these driving pulses is differing from each other.
18. an electric wet-type display comprises:
One electric moistening display unit has at least one pixel; And
One control module, be coupled to the moistening display unit of this electricity, this control module determines the total area of drive waveforms in a picture frame of this pixel accordingly according to a target gray scale, and use this pixel of a drive, wherein this driving signal has a plurality of driving pulses in this picture frame, the area summation of these driving pulses meets this total area in the oscillogram of this driving signal, and these driving pulses are gone up not adjacent to each other connecing in the time.
19. electric wet-type display as claimed in claim 18, wherein the voltage swing of these driving pulses is mutually the same, and has positive driving pulse and a negative driving pulse in these driving pulses at least.
20. electric wet-type display as claimed in claim 19 wherein belongs to the driving pulse quantity of positive pulse with inequality in the driving pulse quantity of negative pulse in these driving pulses.
21. electric wet-type display as claimed in claim 18, wherein the voltage swing of these driving pulses is mutually the same, and the pulsewidth of these driving pulses is differing from each other.
22. electric wet-type display as claimed in claim 18 wherein has a replacement frame before this picture frame, this driving signal has one and exchanges disturbance voltage in this replacement frame.
23. electric wet-type display as claimed in claim 18, wherein arbitrary pulse has during a plurality of sons in these driving pulses, and the voltage of this pulse during this is a little is different.
24. electric wet-type display as claimed in claim 18, wherein the voltage swing of these driving pulses is differing from each other.
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| TW101104111A TWI453717B (en) | 2012-02-08 | 2012-02-08 | Electrowetting display and driving method thereof |
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| TWI453717B (en) | 2014-09-21 |
| TW201333912A (en) | 2013-08-16 |
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