CN1180391C - Driving system for electroluminescent display and method thereof - Google Patents
Driving system for electroluminescent display and method thereof Download PDFInfo
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- CN1180391C CN1180391C CNB021050058A CN02105005A CN1180391C CN 1180391 C CN1180391 C CN 1180391C CN B021050058 A CNB021050058 A CN B021050058A CN 02105005 A CN02105005 A CN 02105005A CN 1180391 C CN1180391 C CN 1180391C
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Abstract
The present invention relates to a driving system and a driving scheme thereof for an electroluminescent display. The storage and recycle principle of electric charges is utilized to reduce the requirement of current switching of a power supply of the system. In the electroluminescent display comprising a plurality of electroluminescent elements which are arranged into a two-dimensional matrix, an anode of the electroluminescent element of each row is electrically connected to a corresponding anode line, and a cathode of the electroluminescent element of each line is electrically connected to a corresponding cathode line. A driving system for driving the electroluminescent display comprises a row/column control circuits. In the driving scheme, an electric passage is formed between the power supply and the ground to light on at least one of the electroluminescent elements. Each anode line is orderly scanned by the driving scheme, and at least one cathode line is driven during every scanning period. The control circuits cause the anode lines which are scanned and the adjacent anode lines to be connected to balance the electric charges in the electroluminescent elements on the two anode lines.
Description
Technical field
The present invention is broadly directed to electroluminescent display, more specifically, relates to the drive system that is used for electroluminescent display and with the method for lower operational requirements and higher this system of reaction rate capability operation.
Background technology
Typical electroluminescent display (ELD) is a kind of device based on electroluminescent cell, and wherein, described electroluminescent cell is arranged and formed the two-dimensional matrix of being made up of row and column.Usually, each electroluminescent cell in the display all has two electrodes of opposite polarity each other, i.e. anode and negative electrodes.One of them electrode is connected on the line of driving circuit of this system, and another electrode then is connected on the alignment.Each electroluminescent cell in the matrix is in the address line of this particular element and the position that alignment intersects.
Electroluminescent cell can be luminous when conduction current.Voltage between negative electrode that appears at element and anode is to apply with forward polarity, that is positive voltage just can be reached luminous phenomenon for giving the anode negative voltage then when giving negative electrode.The light intensity that it sent is by the decision of the size of electric current, electric current itself then with put on electrode on voltage swing relevant.
When operation, it utilizes a drive scheme with impression data on the two-dimensional matrix display board of electroluminescent display.Can comprise the mode with a kind of scanning in order to drive the typical drive scheme of this type of electroluminescent display, one time one row or delegation ground excite each row or of the electroluminescent cell in (activate) this matrix to be listed as.When each column or row was excited, the element that some in these column or row that are excited is selected promptly utilizes a circuit that is switched to the drive system power supply of being set up, and is able to be lighted, and was luminous so that can be energized.Addressed element is excited in the cycle of multiple scanning in regular turn with enough fast speed, and its sweep velocity is near those luminous in regular turn elements, looks like with regard to human eye and is lighted simultaneously, thereby seen suitable image.
The employed a kind of common drive scheme of this type of ELD is to the line scanning of advancing in the matrix of display elements.Row of display elements in the matrix, one then a ground is addressed in regular turn.Simultaneously, use suitable power supply or source, ground to drive this element line,, excite those ELD respectively or those ELD are quit work with requirement according to the pictorial data that will manifest.
Figure 11 is a synoptic diagram, wherein shows the circuit structure in order to the existing drive system that drives an electroluminescent display board.This prior art display board has one 64 row and takes advantage of 132 matrix of display elements that are listed as.In this matrix, each element is with E
C, RIndicated, subscript wherein " C " is in order to mark the position of row, and " R " be the position of mark row then.By E
1,1-E
132,64In the whole matrix that is constituted, the anode of each row electro-luminescent display unit is connected electrically in together, and is connected to their anode line A separately respectively
1-A
132Utilize similar fashion, the negative electrode of each row element also is connected to cathode line B separately
1-B
64
As shown in the figure, the delegation in the 64 row row of display elements, that is in this prior art instance graph, its element is connected to cathode line B
1The delegation of top, by cathode line scanning switch 5 via its appointed cathode line sweep circuit 1
1Be connected to earth potential and be excited.Simultaneously, cathode line B
2-B
64In all other elements, then by via it each self-corresponding negative electrode scanning switch 5
2-5
64Be connected to power supply potential Vcc and upward keep unawakened state.Notice that cathode line sweep circuit 1 comes down to for being responsible for each row display element alternately to be connected to the power supply of this system and switch arrays on the earthing potential.
Anode line drive circuit 2 itself is in fact for can respectively each row display element being connected to switch arrays of power supply potential, can being connected to its appointed separately current source 2 by the display element that will select in each row
1-2
132On, excite those selected display elements.This kind connection utilizes anode line driving switch 6
1-6
132Switching controls and reach.Need then be via the anode line reset switch 7 in the anode line reset circuit 3 by each row of deexcitation
1-7
132Be connected to earth potential, and anode line reset circuit 3, it comes down to be used for switch arrays with each row selectivity ground connection.
Notice the cathode line scanning switch 5 in the cathode line sweep circuit 1
1-5
64Change action, it is to belong to the action that a kind of periodic sequence is carried out basically.On the contrary, the anode line driving switch 6 in the anode line drive circuit 2
1-6
132, and the switch in the anode line reset circuit 37
1-7
132Change action, then be will manifest visual column data, and carry out synchronously according to institute.
For example, in the prior art systems of Figure 11, element E
1,1With E
2,1Just then be not excited at luminous remaining element.For making element E
1,1With E
2,1Can open and luminous, corresponding to anode line A
1Switch 6
1With 7
1, just must promptly be positioned at cathode line B at the row at its place of scanning
1In the row of position, synchronously be switched.Same situation also is applicable to switch 6
2With 7
2
Comprised such as E in the currentless element
3,1Etc. uncharged element, and such as E
3,2Deng the element that has charged.In the accompanying drawings, the display element of being lighted is represented with the symbol of light emitting diode, unawakened element then is to represent with the symbol of electric capacity, and wherein charging person is there to be hatched electric capacity symbolic representation, and local charging and uncharged person then represent with general electric capacity symbol.The charging of these currentless display elements and uncharged state are decided according to the size of the current potential that is occurred between the element electrode two ends.
In electroluminescent display, in the display element intrinsic stray capacitance be a main problem.Because the big capacitive load on each line, and the cause of charge storage effects, appearance along with different image images, in the circulation that visual frame (frames) repeats to scan, when the luminous duration of arbitrary particular element became inequality, display manifests visual quality just can deterioration.Currentless element is because the cause that caused signal cross is coupled under big capacitive load switching condition also can cause its luminous a little phenomenon, and these phenomenons also can make the display quality deterioration.
Has a prior art at least, for example people such as Okuda be entitled as " drive system of driven light-emitting element " the 5th, 844, No. 368 United States Patent (USP)s, wherein disclosed system, be by forcing row to be connected to the specific potential level,, attempting the influence of these problems is minimized to obtain certain normal condition before being excited at those elements with row with element.In another prior art, in the 4th, 975, No. 691 United States Patent (USP)s that are entitled as " scanning counter-rotating symmetry drives ", Lee has disclosed a kind of system, and it can be reversed the scanning sequency of row in each frame.On the row electrode, alternately apply the reverse scanning of being carried out when writing voltage at it, be to wish the average remaining DC voltage at each display pixel element electrode two ends can be lowered substantially, in the hope of avoiding such as intrinsic problems such as the caused sub-image of capacitive behavior because of electroluminescent display.But, in the trial of dealing with problems of these prior aries, the electric capacity of its big panel is by provide big switch current to discharge and recharge from power supply.These switch currents can be along with the quickenings of the increasing of panel size and sweep velocity and are increased.How to make these switch currents and thereby the noise problem that produced minimize and become very important, especially for employed drive system in the mobile electronic product.
Summary of the invention
Therefore, the purpose of this invention is to provide a kind of drive system and corresponding drive scheme thereof that is used for electroluminescent display, it has adopted electric charge to preserve and the round-robin principle, to reduce the demand for the switch current of system power supply.
In an electroluminescent display that constitutes by a plurality of electroluminescent cell matrixes that are arranged in row and row, wherein the anode of those electroluminescent cells in each row is electrically connected to the anode line of a correspondence, and the negative electrode of those electroluminescent cells in each row is electrically connected to the cathode line of a correspondence, the drive system that drives this electroluminescent display comprises: delegation/arrange control circuit, in a drive scheme, it lights in the described electroluminescent cell at least one by set up an electric pathway between power supply and ground.This drive scheme scans each bar cathode line in regular turn, and in that scan period drives at least one in those cathode line simultaneously each time.Electric charge in the electroluminescent cell on cathode line that the control circuit equilibrium just is being scanned and the adjacent cathode line to be scanned, this equilibrium are by before arriving this adjacent cathode line in the scan period, these two cathode line are electrically connected realize.
Description of drawings
With reference to the accompanying drawings, by reading following explanation and accompanying Claim, aforementioned purpose of the present invention and other feature, aspect and advantage will be easier to be understood.In the accompanying drawing:
Fig. 1-4 is the synoptic diagram of first embodiment of the invention, phase (phase) when three different operations are shown respectively, and it is balanced wherein to use row.
Fig. 5-8 is the synoptic diagram of second embodiment of the invention, and phase when three different operations are shown has respectively wherein been used the row equalization scheme.
Fig. 9 and 10 is the synoptic diagram of third embodiment of the invention, and phase when three different operations are shown has respectively wherein been used the row equalization scheme.
Figure 11 shows the synoptic diagram of the circuit structure of an existing drive system that is used for electroluminescence display panel.
Embodiment
For the drive system that is used for electroluminescent display being described and implementing the preferred embodiment of the method for display driver, the display panel that in the following explanation employing is had matrix of display elements that 64 row take advantage of 132 row as an example.In this matrix, the anode of display element is connected to anode line A
1-A
132, its negative electrode then is connected to cathode line B
1-B
64It should be noted that this kind connection is not to be limited connection of the present invention.It only is used for illustrative purposes, and the negative electrode that the syndeton that drive system as described herein had is assumed to be electroluminescent cell is linked on the horizontal scanning line, and its anode is linked on the column drive wire.Generally speaking, if use the equivalence change on similar basis, then this kind drive system equally also can be applied in other the panel structure, and in these structures, the scanner uni of the polarity of electrode of element and the row in the matrix and row drives the role and can exchange.
In addition, those skilled in the art also is appreciated that switch 5
1-5
64, 8
1-8
64, 6
1-6
132, and 7
1-7
132Blocked operation in its corresponding switch arrays is controlled by row/line control circuit 4, as being pointed to shown in the arrow line of switch arrays 1,2 and 3 by control circuit 4 in the accompanying drawing.
Notice that in the accompanying drawings identical reference number is used to indicate same or analogous element in drive system of the present invention.This has comprised the reference number of prior art systems among Figure 11.For example, in described all embodiment of this explanation, cathode line sweep circuit 1 of the present invention has used the cathode line scanning switch 5 with three switching positions
x, employed two switching position switches are different in these switches and the prior art.In addition, sweep circuit 1 of the present invention has also comprised an extra capable equalizer switch 8
xArray.
The present invention is intended to illustrate a kind of drive system and associated drives scheme thereof that is used for electroluminescent display, and it has adopted electric charge to preserve and the round-robin principle, so that reduce the demand for the switch current of system power supply.A kind of like this drive system of novelty and drive scheme thereof can provide sufficient electric charge, with the quick scanning of realization to row, and the precharge to being listed as.
In the drive scheme of prior art, as shown among Figure 11, when the scanning of row forwarded in the delegation that continues by a road wheel that has been excited, the row that this has been excited promptly was switched on the de-energisation system power supply voltage vcc by earthing potential.Simultaneously, will be changeed the back row come up and scanned in regular turn and excite by wheel, promptly can by its not exciting voltage Vcc switch to and excite ground voltage.
On the contrary, in the present invention, after the scanning of first row was finished, secondary series was switched to before the excited state, and these two row are come with the remainder of system is isolated electrically, and are connected electrically in together.Isolated this kind practice of two row of this connection and power Vcc and system earth current potential makes all display element equilibriums in these two row (equalized) quantity of electric charge, and has unified the wherein positive or negative polarity of each element.In other words, these promptly can be shared wherein stored electric charge with display element isolated and that interlink, and reach an intermediate potential value mutually when this electric voltage equalization.Sharing of electric charge mainly is to carry out between element row that has been scanned and the element row that is about to be scanned.Institute's charges accumulated in the element row that has been scanned will be used to all elements in the row that the next one will be scanned.
In this scheme, nearly half electric charge can be saved and supply circulation, that is originally this half electric charge that must be provided by the power supply of system can save.The operation of this kind equalizing charge of phase can utilize comprehensive capable timing signal when being expert at equilibrium, just can carry out in control.In addition, when construction was used for the drive system of electroluminescent display, this kind practice can provide the effective Integrated Solution that needs the minimum number element.
In line scanner system, the electric charge recycle of column direction is made law technology with sharing, can be because the unpredictable and randomness of column data become comparatively complexity.Below among the embodiment with explanation, can use two kinds of row equalization schemes and come to preserve between the electroluminescent cell in display and to share electric charge.For implementing this kind row equalization scheme, need comprehensive row equalizing bus bar, the bus voltage driver of comprehensive control and comprehensive row timing signal are controlled, so that the complexity of the element of required this hardware of construction and quantity all minimize.
Fig. 1-4 is respectively the synoptic diagram of first embodiment of the invention, and it does not adopt real row equalization scheme.Phase during when Fig. 1 and 2 shows three different operatings of this first embodiment respectively in mutually first and second, Fig. 3 and 4 then shows its 3 phase.From first to last, comprise phase when scan line is luminous in the time of these three, phase when row is balanced, and phase during the scan line conversion.Constitute a complete cycle during these three operations that continue mutually, wherein, can carry out the drive scheme of controlling electroluminescent display according to method of the present invention.
In a foundation electroluminescent display of preferred embodiment of the present invention, the panel of electroluminescent cell is organized and forms row and the two-dimensional matrix of going.Each electroluminescent cell wherein all has a negative electrode and an anode.One of them electrode is connected to the line of system driving circuit, and its another electrode then is connected to alignment.Each electroluminescent cell in this matrix all is positioned at the address line of this particular element and the position that alignment intersects.
According to the drive scheme of a preferred embodiment of the present invention, excite each row or column of the electroluminescent cell in this matrix in regular turn by scan mode with delegation or row, drive an electroluminescent display.When each column or row is excited by the mode that scans, the selected element in the column or row that are excited, the circuit that is linked to the drive system power supply that passes through to be set up is switched on power supply, thus they can be luminous.
First o'clock mutually in, be scanned selected person in the display element of row according to the demand Be Controlled that will manifest image and be energized with luminous.As shown in fig. 1, when this scan line is luminous mutually in, all matrix element E
1,1-E
132,1In cathode line B1 on top line by cathode line scanning switch 5
1Institute excites this cathode line scanning switch 5
1This full line is connected to ground.Meanwhile, other row of all in the matrix then passes through its cathode line B separately
2-B
64Be connected to power Vcc, and be de-energized.
For lighting the element E in the top line as shown in FIG.
1,1With E
2,1, anode line drive circuit 2 is by with anode line A
1With A
2Be connected to power supply antianode line A
1With A
2On row charge.In the first shown embodiment of Fig. 1 to 4, this power supply is a power supply of adjusting voltage source in conjunction with a current source and.For example, be used for anode line A
1On the power supply of row have a current source 2
1With an adjustment voltage source 9
1, both combine, and line A
2Power supply have a current source 2
2With a voltage source 9
2, or the like.
So, when the shown scan line of Fig. 1 is luminous mutually in, anode line A
1With A
2On row to be recharged, respectively by by anode line driving switch 6
1With 6
2And be connected to its each self-corresponding power supply.Meanwhile, these row to be recharged must make the earthing potential of self-corresponding anode line reset switch of its each in anode line reset circuit 3 and system disconnect.In the embodiment of described Fig. 1-4, this need be corresponding to switch 6
1With 6
2Difference is change-over switch 7 synchronously
1With 7
2, as shown in Figure 1.
In this way, the anode line driving switch 6
1Closed circuit state, anode line reset switch 7
1Open-circuit condition, and cathode line scanning switch 5
1Closed circuit state, triplicity is got up, and promptly can construction go out a complete electric pathway, this circuit can be with display element E
1,1Be linked between power supply and the earth potential, thereby light E
1,1Identical situation can also be applicable to A
2Element E in the row
2,1On.In noticing when this scan line is lighted mutually, all capable equalizer switches 8
1-8
64All remain and close, that is open-circuit condition, as shown in Figure 1.
Then, the end of phase when lighting, and the beginning of phase when balanced of row as shown in Figure 2, cathode line B along with the scan line among Fig. 1
1With B
2On two row display elements, need be connected to each other, and electrically with system in remainder cut off isolated coming.As previously mentioned, this time after mutually following a period of time mutually in, to exciting of row of display elements, can be by cathode line B
1On row be switched to B in regular turn
2Row on.Fig. 2 is the synoptic diagram of the circuit structure of first embodiment of drive system of the present invention, the situation when obviously the row of implementation column equalization scheme is balanced in mutually.
For this reason, the cathode line scanning switch 5
1With 5
2With its online separately B
1With B
2On respective column, disconnect from power supply and earth potential.Meanwhile, be positioned at line B
1With B
2Between capable equalizer switch 8
1Be switched to closed circuit, with line B
1With B
2On two the row link together.Simultaneously, anode line A
1With A
2Then via anode line reset switch 7
1With 7
2Be connected to earth potential respectively.Anode line A
1With A
2Respectively via switch 7
1With 7
2Formed grounding path, the element E that is lighted in can allowing when previous mutually
1,1With E
2,1In residual voltage removed.This is in order to promote the uniformity of luminance of all pixels in the matrix, and the adverse effect of avoiding crosstalking and bringing.
When this row shown in Figure 2 is balanced mutually in because all elements in two row are all by closed switch 8
1Be joined together in the electric loop of being set up, so between all elements, just can carry out sharing of electric charge.The phenomenon that electric charge recycle between the element in Here it is two row is used.
Importantly, it should be noted that this equalizing charge of phase when this is operated can be allowed the electric charge in the element that is accumulated in the row that is excited, the described i.e. cathode line B in Fig. 1-4 embodiment of row that excites
1On row, can be transferred to the element on next one row to be excited, this row is line B
2On row.This of electric charge kind of transfer (sharing in other words conj.or perhaps or equilibrium), not only when treating to excite follow-up element capable, can reduce charging demand for system power supply, can also be when secondary series will be excited and be recharged successively, because its fact of partly having been charged is quickened its reaction time.In should also be noted that when this journey is balanced mutually, in the middle of all display elements in this two row all can be stabilized in one on the equalizing voltage value.
Then, when when this row is balanced, finishing mutually, then be its 3rd step, phase when promptly scan line shifts.The synoptic diagram of Fig. 3 has illustrated the 3rd step at the drive scheme that is used for drive system, phase when scan line shifts.At this 3 phase, row equalizer switch 8
1Be switched to open circuit, with cathode line B
1From line B
2On separate.Cathode line scanning switch 5
1Then by using with cathode line B
1Be connected to power supply and make its deexcitation (deactivated).Simultaneously, switch 5
2Then pass through line B
2Be connected to earth potential and it is excited.On the other hand, the select row in the display element then can be according to as shown in Figure 3 new pictorial data and be excited.At this moment mutually in, combined the system power supply of forming by voltage source with current source, just can be apace these row are driven on the required exciting voltage.
The shown drive system of Fig. 4 is in its 3 phase, situation shown among itself and Fig. 3 is closely similar, except in this scan period circulation, in fact all become outside the charging fully, at the display element of not lighted on these anode lines as the shown situation of electric capacity symbol that is indicated with charging polarity symbol "+" and " " among the figure.When this operates mutually in, those elements, i.e. E among this described embodiment
2,2With E
3,2, its two electrode with on exciting voltage, it is luminous just these electroluminescent cells to be lighted.
Fig. 1-4 explanation of being carried out as the reference first embodiment of the invention, when the operation of three orders mutually in, cathode line commutation circuit 1, anode line drive circuit 2, and the operation of each switch in the anode line reset circuit 3, finished the anticathode line B in this drive scheme effectively
1With B
2A scan period.Then, continue in a similar manner to the line scanning of respectively advancing in the matrix, from line B
2To B
3, or the like, until last row B
64Then, B
64On last column and B
1On first the row with B
1And B
2On in the middle of the row similar mode match, then, whole proposal just can start anew again, from cathode line B
1On the first row beginning.In this process, the ending of phase when each scan line in each sequential scanning is luminous, to adjacent two the row each to carrying out the capable equalization scheme of repetition.
So, first embodiment described above promptly is to have adopted the equalization scheme that charges according to line direction.Do not consider equilibrium in this embodiment along column direction.Though if be not listed as balanced scheme, then the electric charge in the display element just can not be recovered on the column direction, so can reduce the complexity of the circuit of the row control that is used for drive system relatively.As a result, according to the drive system of the electroluminescent display of aforementioned first embodiment of the present invention, as shown in Fig. 1 to 4, because the lower cause of row circuit complexity, just can enjoy the benefit of lower cost.Though it does not reach optimum degree on electrical source consumption, this kind practice is particularly suitable in the responsive to some extent purposes of electric power and noise.
On the contrary, the having of the second and the 3rd embodiment according to the present invention that will describe in detail below is listed as balanced drive scheme, can reduce the consumption of power supply more.As the result along the charge-restoring on the column direction, it is comparatively complicated that arrange control circuit can become.Optimization on this kind electrical source consumption just can make this type of drive system be particularly suitable for, and such as the application with battery-driven mobile device, wherein, the reduction that power supplying efficiency and switch current consume is one of of paramount importance Consideration.
Fig. 5-8 is the synoptic diagram of second embodiment of the invention, shows respectively wherein to use phase when the different operation of three of the first row equalization scheme is arranged.In the time of these three by earlier to after include, scan line is lighted, OK/the row equilibrium, and phase during three of scan line conversions etc.Adopted the balanced practice of a kind of row/row when noticing second among this embodiment mutually, itself and the shown embodiment of earlier figures 1-4, different to the practice of the shape equilibrium of advancing.When same operation mutually in, can finish effectively row with the row these two kinds of equilibriums.In addition, as mentioned above, can need comparatively complicated arrange control circuit though row are balanced, its enhancement on power-efficient proves that its application on portable unit is correct.
Structurally, this kind drive system because it has comprised a row equalizing bus bar CEB, with and used one to this CEB fill can the voltage source 10 of comprehensive adjustment, make that the system described in itself and Fig. 1-4 is different.In aforementioned first embodiment, be used for the voltage source array difference of indivedual adjustment of anode line, the display system among Fig. 5-8 has with voltage driver 10, and it drives anode line A via CEB
xExcept the row equilibrium, in the system drive scheme that this second embodiment is adopted, also can add the scheme that has row balanced.In other words, the method for driving display system can be different.
In the first row equalization scheme that embodiment adopted of Fig. 5-8, before maybe will be switched to all row on the power supply noble potential on the cathode line, all be connected on the bus CEB, so promptly can allow all display elements in these row, share former already present electric charge.Because the cause of electric charge recycle, this kind practice can be reached the saving of power supply.By using the voltage source of a comprehensive adjustment, bus CEB is maintained on the medium voltage, this voltage enough low in being expert at/be listed as when balanced mutually previous luminous element deexcitation.When the row equalization scheme is finished, wait to be switched to earthy those row and be cut off from bus CEB, then, before the current drives of indivedual row were carried out, the bus of all the other row is just brought to apace by this comprehensive voltage driver to be enough to excite on the current potential of element.
The synoptic diagram of Fig. 5 illustrates, and is using under the drive scheme of the first row equalization scheme, and the drive system of this electroluminescent display is in its first step, the situation when promptly scan line is lighted in mutually.Have among second embodiment of extra row equilibrium at this, the operation of its row equilibrium is identical with the operation of being adopted in aforementioned first embodiment in fact.
What Fig. 6 showed is second step, phase when promptly the row of drive scheme/row are balanced.When this journey/row is balanced mutually in, anode line driving switch 6
1, 6
2With 6
3With the row A that before had been excited
1With A
2, and row A to be excited
3Be connected on the bus CEB, be used for sharing and equilibrium of electric charge.The voltage source 10 of this comprehensive adjustment maintains the row equalizing voltage low to being enough to effectively luminous element E before
1,1With E
2,1On the current potential of deexcitation, as shown in Figure 6.In this process, switch 7
1, 7
2With 7
3Keep open circuit, so that make anode line A
1, A
2With A
3On those row are connected on the bus CEB, balanced to realize row.In this row equalization scheme that is proposed, the residual voltage in the electroluminescent cell is able to equilibrium by being connected to bus CEB, and can avoids display element inhomogeneous, and the adverse effect of crosstalking therebetween.
What Fig. 7 showed is the third step that has adopted the drive system of the first row equalization scheme, that is, and and phase when scan line shifts.Along with the end of row/row phase when balanced, anode line driving switch 6
1With other switch, just with anode line A
1On row in element, and other element to be de-energized is connected on the earth potential.Simultaneously, the row that bus CEB will be to be excited are such as A
2With A
3Deng, bring to required excitation potential, so that after the equilibrium of being expert at, horizontal scanning line B
2In being excited, make element E
2,2And E
3,2Be energized and lighted luminous, as shown in Figure 7.
Fig. 8 shows the situation in another stage of 3 phase of the drive system that has adopted the first row equalization scheme.At this moment mutually in, current source is taken over when it ends up, this moment, the anode line driving switch 6
2With 6
3Be switched to closed circuit so that with anode line A
2With A
3Be connected to its corresponding current sources 2 separately
2With 2
3On, as shown in Figure 8.
Fig. 9 and 10 is the synoptic diagram of third embodiment of the invention, the situation of phase during when showing three different operatings wherein having used the row equalization schemes respectively in mutually two.In this second kind of row equalization scheme that embodiment adopted of Fig. 9 and 10, only there are those guilds of the existing change of its image to be connected on the bus CEB.This kind scheme can be allowed these row of display element with opposite potential polarity, separated open and correspondingly be driven before, shared electric charge and balanced current potential betwixt.Because in this scheme, have some row can maintain on the previous noble potential, so those previous luminous elements only the effect of dependency line equilibrium can be by deexcitation, and this can be reduced to the voltage difference at element two ends below the visible luminous threshold value.For the electroluminescent cell that has sharp-pointed turning point on voltage and current-voltage index characteristic, the reduction of the voltage difference of reaching via the row equilibrium is enough to these elements of deexcitation effectively.
As shown in Fig. 9 and 10, adopt this embodiment of the drive system of the present invention of secondary series equalization scheme, similar with aforementioned first scheme (Fig. 5-8) haply, difference therebetween only is the driving method that its row equalization scheme is adopted.During being expert at/being listed as when balanced mutually, anode line driving switch 6
1With 6
3With anode line A
1With A
3On row in element be connected on the bus CEB, be used for that electric charge is shared and equalizing charge, wherein, described anode line A
1With A
3Wait to be switched and be used for opposite pictorial data.Fig. 9 illustrates second step of this embodiment drive scheme, at once/and phase when row are balanced.
In finishing mutually when being expert at/being listed as equilibrium, include 6
1The cathode line driving switch, then just will treat to be connected on the earth potential on its corresponding cathode line by the row of the element of deexcitation.Simultaneously, bus CEB can be with such as A
2With A
3Each row that wait is excited brings to element E
2,2With E
3,2Needed exciting voltage, with after finishing when the row equilibrium, horizontal scanning line B
2In the time of will being excited, make it luminous, as shown in figure 10.Figure 10 shows the third step of the drive system that adopts this secondary series equalization scheme, phase when promptly scan line shifts.At this moment mutually in, current source is taken over when it ends up mutually, this moment, the anode line driving switch 6
2With 6
3Be switched to closed circuit so that with anode line A
2With A
3Be connected to its current source 2 separately
2With 2
3On, situation as shown in Figure 8 is similar.
In having adopted these embodiment of the present invention of row equalization schemes, the voltage source 10 of comprehensive adjustment remains on bus CEB below the one maximum column equalizing voltage, so that can prevent effectively that electroluminescent cell is luminous.If no-voltage driver 10, the voltage that then appears on the bus CEB mainly is according to before for the quantity of high row the ratio of the quantity of low row being decided.For mutual-assistance electric charge when the equilibrium is preserved maximization,, then do not need to adjust voltage source 10 and force bus CEB to arrive a higher current potential if EB has been lowered to below the maximum column equalizing voltage.
Though above-mentioned is to one of specific embodiment of the present invention complete explanation, also can carry out various modifications to it, uses different structures and equivalent person.For example, though adopted general electroluminescent display to come the declarative description embodiments of the invention in this explanation,, also roughly be that equivalence is suitable for such as organic light emitting apparatus (OLED) and high molecule electroluminescent device (PELD) etc.Therefore, the description of front explanation should not be taken as and limit scope of the present invention, and scope of the present invention is limited by accompanying Claim.
Claims (24)
1. in an electroluminescent display that includes the electroluminescent cell matrix that is arranged as a plurality of row and columns, the negative electrode of the described electroluminescent cell on wherein said each row is electrically connected to the cathode line of a correspondence, and the anode of described each described electroluminescent cell that lists is electrically connected to the anode line of a correspondence, and a kind of drive system that is used to drive described electroluminescent display comprises:
Delegation/arrange control circuit, in a drive scheme, it lights in the described electroluminescent cell at least one by set up an electric pathway between power supply and ground, and this scheme scans described each bar cathode line in regular turn, simultaneously in scan period each time, driven in synchronism at least one described anode line; Electric charge in the electroluminescent cell on described cathode line that wherein said control circuit equilibrium just is being scanned and the adjacent cathode line in regular turn to be scanned, this equilibrium be by in described scan cycle to the described adjacent cathode line, the described cathode line that just is being scanned is electrically connected to adjacent cathode line described to be scanned finishes.
2. the drive system that is used for electroluminescent display according to claim 1, also include a cathode line sweep circuit, its with changeable mode with in the described cathode line selected one or be connected to power supply, to ground, or switch to floating potential, and with on the selected cathode line that is connected to adjacency in the described cathode line.
3. the drive system that is used for electroluminescent display according to claim 2 also includes an anode line drive circuit, and it is connected to power supply in changeable mode with some selected in described anode line anode lines.
4. the drive system that is used for electroluminescent display according to claim 1 also comprises:
One cathode line sweep circuit, its with changeable mode with in the described cathode line selected one or be connected to power supply, to ground, or switch to floating potential, and with on the selected cathode line that is connected to adjacency in the described cathode line;
One anode line drive circuit, it is connected to power supply in changeable mode with some selected in described anode line lines; Wherein
In the drive scheme of described row/arrange control circuit, light in the described electroluminescent cell at least one by between power supply and ground, setting up an electric pathway, through described cathode line sweep circuit the described cathode line that is scanned is connected to ground, scan described each bar cathode line in regular turn, simultaneously, come driven in synchronism at least one described anode line by described driven anode line being connected to power supply through described anode line drive circuit in scan period each time.
5. the drive system that is used for electroluminescent display according to claim 4, wherein said cathode line sweep circuit also includes a plurality of cathode line scanning switchs, its each all with changeable mode with in the described cathode line corresponding one or be connected to power supply, to ground, or switch to floating potential, and a plurality of capable equalizer switches, its each all with changeable mode with in the described cathode line corresponding one be connected on the corresponding cathode line.
6. the drive system that is used for electroluminescent display according to claim 4, wherein said anode line drive circuit also include a plurality of anode line driving switchs, its each all with changeable mode with in the described anode line corresponding one be connected to power supply.
7. the drive system that is used for electroluminescent display according to claim 1 also comprises:
One cathode line sweep circuit, it includes a plurality of cathode line scanning switchs, its each all with changeable mode with in the described cathode line corresponding one or be connected to power supply, to ground, or switch to floating potential, and a plurality of capable equalizer switches, its each all in changeable mode with on the corresponding cathode line that is connected to adjacency in the described cathode line;
One anode line drive circuit, it includes a plurality of anode line driving switchs, its each all with changeable mode with in the described anode line corresponding one be connected to power supply; Wherein
In the drive scheme of described row/arrange control circuit, light in the described electroluminescent cell at least one by between power supply and ground, setting up an electric pathway, this scheme is connected to ground by a cathode line scanning switch through correspondence with the described cathode line that is scanned, scan described each bar cathode line in regular turn, and, by some anode line driving switchs described driven anode line is connected to power supply and comes driven in synchronism at least one described anode line through correspondence in scan period each time; Electric charge in the electroluminescent cell on described cathode line that wherein said control circuit equilibrium just is being scanned and the adjacent cathode line in regular turn to be scanned, this equilibrium be by in described scan cycle to the described adjacent cathode line, via a capable equalizer switch of correspondence the described cathode line that just is being scanned is electrically connected to that adjacent cathode line described to be scanned finishes.
8. the drive system that is used for electroluminescent display according to claim 1, wherein:
Described control circuit comes electric charge in the electroluminescent cell on balanced described cathode line that just is being scanned and the adjacent cathode line in regular turn to be scanned by the described cathode line that is scanned being electrically connected to described adjacent cathode line, and when in described scan cycle to the described adjacent cathode line, when described adjacent cathode line is scanned in regular turn, balanced just driven and treat electric charge in the electroluminescent cell in driven anode line.
9. the drive system that is used for electroluminescent display according to claim 8, also include a cathode line sweep circuit, its with changeable mode with in the described cathode line selected one or be connected to power supply, to ground, or switch to floating potential, and with on the selected cathode line that is connected to adjacency in the described cathode line.
10. the drive system that is used for electroluminescent display according to claim 8, also include an anode line drive circuit, it is connected to power supply in changeable mode with some selected in described anode line lines, or is connected to an adjustment voltage source via a row equalizing bus bar.
11. the drive system that is used for electroluminescent display according to claim 1 also comprises:
One cathode line sweep circuit, its with changeable mode with in the described cathode line selected one or be connected to power supply, to ground, or switch to floating potential, and with on the selected cathode line that is connected to adjacency in the described cathode line;
One anode line drive circuit, it is connected to power supply in changeable mode with some anode lines selected in the described anode line, or is connected to an adjustment voltage source via a row equalizing bus bar; Wherein
In the drive scheme of described row/line control circuit, light in the described electroluminescent cell at least one by between power supply and ground, setting up an electric pathway, through described cathode line sweep circuit the described cathode line that is scanned is scanned described each bar cathode line with being connected in regular turn, simultaneously by described driven anode line being connected to power supply and driven in synchronism at least one described anode line through described anode line drive circuit; Wherein, the electric charge in the electroluminescent cell of described control circuit equilibrium on described cathode line that just is being scanned and adjacent cathode line in regular turn to be scanned; This equilibrium be by in described scan cycle to the adjacent cathode line, through described cathode line sweep circuit the cathode line that the described cathode line that just is being scanned is electrically connected to adjacency described to be scanned is realized, and when scanning the cathode line of this adjacency in regular turn, balanced described just driven anode line and treat electric charge in the electroluminescent cell in driven anode line, this equilibrium be by in described scan cycle to the described adjacent cathode line, will described driven anode line and treat that driven anode line is connected to that an adjustment voltage source realizes through described row equalizing bus bar.
12. the drive system that is used for electroluminescent display according to claim 11, wherein said cathode line sweep circuit also includes a plurality of cathode line scanning switchs, its each all with changeable mode with a cathode line of correspondence or be connected to power supply, to ground, or switch to floating potential, and a plurality of capable equalizer switches, its each all be connected on the cathode line of adjacency with the cathode line of changeable mode with correspondence.
13. the drive system that is used for electroluminescent display according to claim 11, wherein said anode line drive circuit also includes a plurality of anode line driving switchs, its each all a cathode line of correspondence is connected to power supply with switching mode, or be connected to one via a row equalizing bus bar and adjust voltage source.
14. the drive system that is used for electroluminescent display according to claim 7, wherein:
Described anode line drive circuit can also be connected to one via a row equalizing bus bar and adjust voltage source;
Described row/line control circuit is when scanning the cathode line of described adjacency in regular turn, balanced described just driven anode line and treat electric charge in the electroluminescent cell in driven anode line, this equilibrium be by in described scan cycle to the described adjacent cathode line, will described driven anode line and treat that driven anode line is connected to that an adjustment voltage source realizes through described row equalizing bus bar.
15. the drive system that is used for electroluminescent display according to claim 1, wherein:
Described control circuit comes electric charge in the electroluminescent cell on balanced described cathode line that just is being scanned and the adjacent cathode line in regular turn to be scanned by the described cathode line that is scanned being electrically connected to described adjacent cathode line, and when in described scan cycle to the described adjacent cathode line, when described adjacent cathode line is scanned in regular turn, electric charge in the electroluminescent cell on the balanced described anode line, wherein said anode line have is treating reformed pictorial data in the one scan down.
16. the drive system that is used for electroluminescent display according to claim 15, also include a cathode line sweep circuit, the cathode line that it will be selected in changeable mode or be connected to power supply, to ground, or switch to floating potential, and a cathode line will selecting is connected on the cathode line of adjacency.
17. the drive system that is used for electroluminescent display according to claim 15, also include an anode line drive circuit, it is connected to power supply in changeable mode with some anode lines selected in the described anode line, or is connected to an adjustment voltage source via a row equalizing bus bar.
18. the drive system that is used for electroluminescent display according to claim 17 also comprises:
One cathode line sweep circuit, the cathode line that it will be selected in changeable mode or be connected to power supply, to ground, or switch to floating potential, and a cathode line will selecting is connected on the cathode line of adjacency;
In the drive scheme of wherein said row/arrange control circuit, light in the described electroluminescent cell at least one by between power supply and ground, setting up an electric pathway, this scheme by scanning described each bar cathode line through described anode and cathode line scanning circuit with the described cathode line that is scanned, simultaneously by through described anode line drive circuit described driven anode line being connected to power supply and driven in synchronism at least one described anode line with being connected in regular turn; Wherein, the electric charge in the electroluminescent cell of described control circuit equilibrium on described cathode line that just is being scanned and adjacent cathode line in regular turn to be scanned; This equilibrium be by in described scan cycle to the adjacent cathode line, through described cathode line sweep circuit the cathode line that the described cathode line that is scanned is electrically connected to described adjacency is realized, and when in regular turn the cathode line of this adjacency being scanned, electric charge in the electroluminescent cell on the balanced described anode line, described anode line has treats reformed pictorial data in following one scan, this equilibrium be by in described scan cycle to the described adjacent cathode line, through described row equalizing bus bar described anode line is connected to one and adjusts that voltage source realizes.
19. the drive system that is used for electroluminescent display according to claim 18, wherein said cathode line sweep circuit also includes a plurality of cathode line scanning switchs, its each with changeable mode with a cathode line of correspondence or be connected to power supply, to ground, or switch to floating potential, and a plurality of capable equalizer switches, its each be connected on the cathode line of adjacency with the cathode line of changeable mode correspondence.
20. the drive system that is used for electroluminescent display according to claim 18, wherein said anode line drive circuit also includes a plurality of anode line driving switchs, its each in the mode switched an anode line of correspondence is connected to power supply, or be connected to one via a row equalizing bus bar and adjust voltage source.
21. the drive system that is used for electroluminescent display according to claim 20, wherein:
Described cathode line sweep circuit contains a plurality of cathode line scanning switchs, its each with changeable mode with a cathode line of correspondence or be connected to power supply, to ground, or switch to floating potential, and a plurality of capable equalizer switches, its each be connected on the cathode line of adjacency with the cathode line of changeable mode correspondence; And
In the drive scheme of described row/arrange control circuit, light in the described electroluminescent cell at least one by between power supply and ground, setting up an electric pathway, through a corresponding cathode line scanning switch the described cathode line that is scanned is scanned described each bar cathode line with being connected in regular turn, simultaneously by described driven anode line being connected to power supply and driven in synchronism at least one described anode line through corresponding some anode line driving switchs, wherein, electric charge in the electroluminescent cell of described control circuit equilibrium on described cathode line that just is being scanned and adjacent cathode line in regular turn to be scanned, this equilibrium be by in described scan cycle to the described adjacent cathode line, through a corresponding capable equalizer switch cathode line that the described cathode line that is scanned is electrically connected to described adjacency is realized, and when in regular turn the cathode line of this adjacency being scanned, electric charge in the electroluminescent cell on the balanced described anode line, described anode line has treats reformed pictorial data in following one scan, this equilibrium be by in described scan cycle to the described adjacent cathode line, through described row equalizing bus bar described anode line is connected to one and adjusts that voltage source realizes.
22. drive system at the electroluminescent display that is used for including the electroluminescent cell matrix that is arranged as a plurality of row and row, wherein the negative electrode of the described electroluminescent cell on each row is electrically connected to the cathode line of a correspondence, each anode that lists described electroluminescent cell is electrically connected on the anode line of a correspondence, described drive system includes delegation/arrange control circuit, in order to light in the described electroluminescent cell at least one by set up an electric pathway between power supply and ground, the method for the described electroluminescent display of this drive systems may further comprise the steps:
Scan each bar cathode line in regular turn, simultaneously in scan period each time, driven in synchronism at least one described anode line; With
Electric charge in the electroluminescent cell of described control circuit equilibrium on described cathode line that just is being scanned and adjacent cathode line in regular turn to be scanned, this equilibrium be by in described scan cycle to the described adjacent cathode line, the cathode line that the described cathode line that is scanned is electrically connected to described adjacency realizes.
23. drive system at the electroluminescent display that is used for including the electroluminescent cell matrix that is arranged as a plurality of row and row, wherein the negative electrode of the described electroluminescent cell on each row is electrically connected to the cathode line of a correspondence, each anode that lists described electroluminescent cell is electrically connected on the anode line of a correspondence, described drive system includes delegation/arrange control circuit, in order to light in the described electroluminescent cell at least one by set up an electric pathway between power supply and ground, the method for the described electroluminescent display of this drive systems may further comprise the steps:
Scan each bar cathode line in regular turn, simultaneously in scan period each time, driven in synchronism at least one anode line; And
Electric charge in the electroluminescent cell of described control circuit equilibrium on described cathode line that just is being scanned and adjacent cathode line in regular turn to be scanned, this equilibrium is to realize by the cathode line that the described cathode line that is scanned is electrically connected to described adjacency, and when scanning the cathode line of this adjacency in regular turn, balanced described just driven anode line and treat electric charge in the electroluminescent cell in driven anode line, this equilibrium be by in described scan cycle to the described adjacent cathode line, with described driven anode line and treat that driven anode line is connected to one and adjusts that voltage source realizes.
24. drive system at the electroluminescent display that is used for including the electroluminescent cell matrix that is arranged as a plurality of row and row, wherein the negative electrode of the described electroluminescent cell on each row is electrically connected to the cathode line of a correspondence, each anode that lists described electroluminescent cell is electrically connected on the anode line of a correspondence, described drive system includes delegation/arrange control circuit, in order to light in the described electroluminescent cell at least one by set up an electric pathway between power supply and ground, the method for the described electroluminescent display of this drive systems may further comprise the steps:
Scan each bar cathode line in regular turn, simultaneously in scan period each time, driven in synchronism at least one anode line; And
Electric charge in the electroluminescent cell of described control circuit equilibrium on described cathode line that just is being scanned and adjacent cathode line in regular turn to be scanned, this equilibrium realizes the cathode line that the described cathode line that is scanned is electrically connected to described adjacency, and when in regular turn the cathode line of this adjacency being scanned, electric charge in the electroluminescent cell on the balanced described anode line, described anode line has treats reformed pictorial data in following one scan, this equilibrium be by in described scan cycle to the described adjacent cathode line, described anode line is connected to one adjusts that voltage source realizes.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US09/782,480 US6501226B2 (en) | 2001-01-19 | 2001-02-12 | Driving system and method for electroluminescence display |
| US09/782,480 | 2001-02-12 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1372239A CN1372239A (en) | 2002-10-02 |
| CN1180391C true CN1180391C (en) | 2004-12-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021050058A Expired - Fee Related CN1180391C (en) | 2001-02-12 | 2002-02-10 | Driving system for electroluminescent display and method thereof |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7333078B2 (en) * | 2003-12-29 | 2008-02-19 | Solomon Systech Limited | Driving system and method for electroluminescence displays |
| US7852304B2 (en) * | 2006-07-20 | 2010-12-14 | Solomon Systech Limited | Driving circuit, system, and method to improve uniformity of column line outputs in display systems |
| CN102157136B (en) * | 2011-02-24 | 2012-12-12 | 深圳市华星光电技术有限公司 | Liquid crystal display and driving method thereof |
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