CN100587780C - Electrooptical device, electronic equipment, and driving method for electrooptical device - Google Patents
Electrooptical device, electronic equipment, and driving method for electrooptical device Download PDFInfo
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Abstract
An electronic device comprises a unit circuit having an electronic element, a data line connected to the unit circuit. Any party of a pair control wire for controlling output of the electronic deviceis connected by the data line in the unit circuit. The electronic device supplies the control line with control signal of inverse phase which are approaching or adjoining.
Description
The application is that application number is " 03801252.9 ", and the applying date is on April 24th, 2003, and denomination of invention is divided an application for the application of " driving method of electronic installation, e-machine and electronic installation ".
Technical field
The present invention relates to a kind of driving circuit that utilizes the electrooptic element of organic electroluminescent (to call " EL " in the following text) etc., particularly also can be clear, correct brightness carries out the improvement of luminous driving method in low gray scale viewing area.
Background technology
As the driving method of the electrooptic element of EL element etc., utilizing does not have crosstalk, can low-power drives and can improve the driven with active matrix mode in electrooptic element life-span.Because EL element by luminous with the big or small corresponding brightness of supplying electric current, in order to obtain desirable brightness, is necessary to supply with correct electric current (referring to the open WO98/36407 communique in the world) to EL element.
In Figure 13, represented block diagram according to the display device of driven with active matrix mode.As shown in figure 13, in this display device, show in image the viewing area of usefulness, with clathrate configuration sweep trace Vs1～Vsn (N is the maximum number of sweep trace) and data line I data1～I dataM (M is the maximum number of data line), in the cross section of each line, configuration comprises image element circuit Pmn (1≤m≤M, the 1≤n≤N) of EL element.Utilize sweep circuit to select sweep trace Vsn successively, supply with data-signal to each data line I datam corresponding to intermediate grey values by D/A converter.
Yet, in display device, write low data gray signal spended time, the problem of deficiency etc. occurs writing sometimes.
Particularly, be called current programmed mode, supply with in the mode corresponding to the data-signal with strength of current of gray scale, above-mentioned problem is more obvious.At first, because supply is corresponding to the represented gray-scale value of pixel (point) in the value of the program current of data line, the data line of electric current cross to(for) the pixel stream of low gray scale is minimum.If current value is little, then discharging and recharging of the stray capacitance of data line wanted spended time, in image element circuit, is programmed into to the time till the constant current value and increases, and is difficult to end in (being a horizontal scan period in general) and writes during given writing.Its result, along with the raising of the luminescence efficiency of EL element, program current is more and more littler, the situation of correct current value can occur writing to image element circuit.
In addition, if become below the 10nA, near transistorized leakage current value at the current value of low gray scale viewing area.Therefore, leakage current gives the influence of program current can not be ignored, and S/N ratio reduces, and the sharpness in the low gray-scale value viewing area of display device worsens.
Further, along with exploration on display resolution ratio improves, the number of data line also increases, because the picture element matrix substrate increases, is connected apart from dwindling with connecting line number between the peripheral hardware driving governor, with the difficulty that becomes being connected of picture element matrix substrate, increase the manufacturing cost of display device.
Summary of the invention
In order to solve the above problems, the object of the present invention is to provide a kind of brightness that also can be clear, correct in low gray scale viewing area to carry out the image demonstration, and can prevent the driving method of electro-optical device, e-machine and electro-optical device that manufacturing cost increases.
A kind of electro-optical device of the present invention comprises element circuit with electrooptic element and the data line that is connected with described element circuit; A pair of described element circuit is connected on the described data line; The either party who on each described element circuit, connects the pair of control line of the output of controlling each described electrooptic element; Supply with the control signal of antiphase portion with approaching mutually or adjacency to each described control line; A pair of described control line intersects on the described element circuit of each adjacency.
In above-mentioned electro-optical device, preferably export pulse continuously with given dutycycle to described control line.
In above-mentioned electro-optical device, preferred a pair of described control line intersects on the described element circuit of each adjacency.
In above-mentioned electro-optical device, preferably will constitute one group to the described element circuit of determined number; Described control signal to the described element circuit of contiguous set is supplied with between described contiguous set, has the antiphase of approaching or adjacency.
Another kind of electro-optical device of the present invention, a pair of element circuit that will have electrooptic element is connected on the data line; On each described element circuit, connect the either party of pair of control line who controls the output of each described electrooptic element according to given dutycycle; Supply with the control signal of antiphase portion with approaching mutually or adjacency to each described control line; A pair of described control line intersects on the described element circuit of each adjacency.
The driving method of electro-optical device of the present invention, wherein said electro-optical device comprise element circuit with electrooptic element and the data line that is connected with described element circuit; In the group of the described element circuit of adjacency or described element circuit, according to have between mutual active period near or the control line controlled with given dutycycle like that of the antiphase of adjacency intersect on the described element circuit of each adjacency.
Electro-optical device of the present invention comprises: the element circuit with electrooptic element; The data line that is connected with element circuit; The curtage corresponding with the data-signal of supplying with from the outside is as the 1st the 1st output unit of exporting; The curtage corresponding with the intensity of above-mentioned the 1st output is as the 2nd the 2nd output unit of exporting; The 1st electric current or the side from above-mentioned the 2nd output that the 2nd output unit is exported that selection is exported from the 1st output unit perhaps select both sides simultaneously, and are used for the selection feedway to above-mentioned data line supply.
At this, select feedway also can comprise at least one on-off element.This on-off element is used to forbid or allow the element of first output or second output.Except on-off element, can also comprise: utilize adder operation circuit during the writing of regulation in, can realize changing the formation of the function of the fan-out capability of selecting feedway.
Data line also can comprise the load device of the electric current of accepting to flow through this data line.At this moment, preferably with the constant current driven ability of element circuit and the ratio of the electric current occupancy load of load device, equal the ratio of current supply ability with the current supply ability of the 2nd output unit of the 1st output unit in fact.And preferred load device is arranged to be in the end of data line when the 2nd output unit is seen.By getting involved element circuit, output unit becomes the formation of face-off with load device.Further, load device constitutes when selecting feedway to select to accommodate the electric current that flows through this data line from the 2nd output of the 2nd output unit and when data line is supplied with.
Select feedway, also can constitute and only select to export, and supplying with to the given period that finishes at least between the period of output of electrooptic element supply output to data line from the 1st of the 1st output unit.
Select feedway, also can constitute and select the 2nd output at least to the initial at least given period between the period of output of electrooptic element supply output, and supply with to data line from the 2nd output unit.
The 2nd output unit preferably constitutes can export the 2nd big output of output valve that has than the 1st output of the 1st output unit output.Utilizing reliably program current of big electric current, is desirable for improving S/N.
Select feedway, also can constitute and select the 2nd output at least to the initial at least given period between the period of output of electrooptic element supply output, and supply with to data line from the 2nd output unit; And the given period of the end between this period of output is selected the 1st output of the 1st output unit at least, and supplies with to data line.
Select feedway, constitute roughly same place, can supply with output from the 1st output unit and the 2nd output unit at data line.
The 2nd output unit, the curtage that also can constitute the data-signal that will supply with corresponding to the outside is exported as the 2nd.Constitute according to this, the output valve of second output also can become value arbitrarily according to data setting.
At this, also can constitute at a data line and be provided with a plurality of output feedwaies that constitute by the 1st output unit, the 2nd output unit and selection feedway, during the storage of output feedway was based on the current value of data-signal or magnitude of voltage, other at least one output feedwaies were supplied with output to data line.
At this moment, each exports feedway, also can with former and later two horizontal scan period in a plurality of horizontal scan period as supply with to data line output during, and with remaining horizontal scan period as control unit circuit during.
Further, in this constitutes, will constitute one group to the electro-optical device of determined number; Horizontal scan period is divided into to the fixed number son during each in, each electro-optical device constitutes current value or the magnitude of voltage of storage based on each self-corresponding data-signal.
Have again, also can allow a pair of element circuit be connected on the data line, on each element circuit, connect the either party of the pair of control line of the output of controlling each electrooptic element; Can supply with the control signal of antiphase portion with approaching mutually or adjacency to each control line.Owing to have the control signal of the phase reversal portion of near each other or adjacency, do not having in the short time of vision difference, the electrooptic element that abuts against data line is driven to phase reversal, the intermittence that can compensated pulse drives.
At this, can export pulse continuously to control line with given dutycycle.During can changing the driving of electrooptic element by the method that changes dutycycle.
Further, pair of control line intersection also can be on the element circuit of each adjacency.The method of utilize intersecting did not have in the short time of vision difference, and the electrooptic element that abuts against the control line direction is driven to phase reversal, the intermittence that can compensated pulse drives.
At this, also can will constitute one group for the element circuit of determined number; The pair of control line intersects on each element circuit of adjacent set.Sometimes, as the aim of the compensation of the element circuit unit of stated number, such as, as image element circuit, in the colour element unit of image element circuit as combination of a plurality of primary colors, utilize element circuit the colour of a plurality of primary colors to show.
Electrooptic element of the present invention also can be a current driving element.
At this, so-called " electrooptic element " generally is meant because electro ultrafiltration, and be luminous or change the element of the state of the light that comes from the outside; Comprise that own luminous element and control are from two kinds of the translucent elements of exterior light etc.For example, electrooptic element comprises EL element, liquid crystal cell, electrophoresis element and applies electric field and the electron bombardment that produces comes luminous electronics to emit element (FED) at luminous plaque.
At this, above-mentioned electrooptic element is current driving element such as electroluminescence (EL) element preferably.So-called " electroluminescent cell " is organic or inorganic (Zn:S etc.) material no matter generally be meant its photism material, owing to apply electric field, from the anode injected holes and from the negative electrode injected electrons again in conjunction with the time, utilize the energy of combination again, make the luminous element that utilizes electro optical phenomenon of photism material.In addition, electroluminescent cell as the synthem that electrode is clamped, also can utilize beyond the luminescent layer that the photism material forms, and can also comprise any one or both sides of hole transporting layer and electron supplying layer.Particularly, as synthem, except negative electrode/luminescent layer/anode, can adopt the synthem of negative electrode/luminescent layer/hole transporting layer/anode, negative electrode/electron supplying layer/luminescent layer/male or female/electron supplying layer/luminescent layer/hole transporting layer/anode etc.
The present invention also is the e-machine that comprises electro-optical device of the present invention.Here, " e-machine " is unqualified, can be the information board, game device, operation board, e-book and the digital camera of processing equipment, portable portable machine with TV, DSP device, PDA, electronic documentation, mobile phone, video camera etc. of TV, automobile guiding device, POS, home computer, head facsimile unit that display, back of the body type or preceding type projector, band Presentation Function are installed, electronic service guide plate, transport vehicles.
The present invention, the driving method being used for supplying with to the element circuit with electrooptic element the electro-optical device of output comprises: the curtage corresponding with the data-signal of supplying with from the outside is as the 1st step of exporting; The step of the 2nd output that output is corresponding with the intensity of the 1st output; Select a side of the 1st output or the 2nd output, perhaps select both sides simultaneously, and to the step of the data line supply that is connected with element circuit.
In the step that data line is supplied with, also can be at the given period that finishes at least that should be between the period of output of electrooptic element output, only select the 1st output and supply with to data line.
In the step of supplying with to data line, also can be select the 2nd to export and supply with to the initial at least given period between the period of output of electrooptic element output to data line.
In the step of output the 2nd output, also can constitute the 2nd output that output has the output valve bigger than the 1st output valve that had of output.
In the step of supplying with to data line, also can be select the 2nd to export and supply with at least to the initial given period between the period of output of electrooptic element output to data line; The given period of the end between this period of output selects the 1st to export and supply with to data line at least.
In the step of output the 2nd output, also can be the 2nd output that output has current value corresponding with the data-signal of supplying with from the outside or magnitude of voltage.
In the step of output the 1st output and export among at least one side in the step of the 2nd output, before output the 1st output or the 2nd output, also can comprise the step of store electricity flow valuve or magnitude of voltage.
When can supply with the output supply group that many groups are exported by the 1st and the 2nd output constitutes to a data line time, during carrying out, and carry out step at least one output supply group at other to data line output by the step of an output supply group store electricity flow valuve or magnitude of voltage.
At this, also can former and later two horizontal scan period in most horizontal scan period in, carry out each step; Be included in step that carry out, control unit circuit in remaining horizontal scan period.
In the step of store electricity flow valuve or magnitude of voltage, also horizontal scan period can be divided into in during the son of fixed number each, storage is based on the current value or the magnitude of voltage of each self-corresponding data-signal.
Description of drawings
Fig. 1 is the block diagram of the e-machine of present embodiment.
Fig. 2 is that the electric current of first embodiment amplifies the principle of work key diagram.
Fig. 3 is the circuit diagram of the driving circuit of first embodiment.
Fig. 4 is the sequential chart of the driving circuit of first embodiment.
Fig. 5 is the circuit diagram of the driving circuit of second embodiment.
Fig. 6 is the principle of work key diagram of the electric current latch cicuit that utilizes the double buffering formula of second embodiment.
Fig. 7 is the configuration example of the electric current latch cicuit of second embodiment.
Fig. 8 is the sequential chart of the driving circuit of second embodiment.
Fig. 9 is the circuit diagram of the driving circuit of the 3rd embodiment.
Figure 10 is the figure that concerns between the image element circuit of pulsed drive of expression the 3rd embodiment.
Figure 11 is the sequential chart of the driving circuit of the 3rd embodiment.
Figure 12 is the example of the e-machine of the 4th embodiment.
Figure 13 is the block diagram of the display device of driven with active matrix mode.
Among the figure: Vsn-selection wire, Vgn-light emitting control line, Idatam-data line, Pmn-image element circuit, PmnC-colour element, OELD-organic EL, Lm-electric current latch cicuit, Bm-current amplification circuit.
Embodiment
Below, accompanying drawings preferred implementation of the present invention.Only implementing example of the present invention at following embodiment, is not to limit its scope of application.
＜the first embodiment 〉
Embodiments of the present invention are to comprise the electro-optical device that utilizes the driving circuit of EL element as electrooptic element.In Fig. 1, expression comprises the entire block diagram of the e-machine of this electro-optical device.
As shown in Figure 1, this e-machine has the function that is shown specified image by computing machine, comprises display circuit 1, driving governor 2 and computer installation 3 at least.
Driving governor 2 is formed on the substrate as silicon single crystal body, possesses D/A converter 21 (first and second output units of the present invention), display-memory 22 and control circuit 23 at least.The transmission of the gray scale video data of control circuit 23 between control and computer installation 3, can also be to driving governor 2 and the various control signals of display circuit 1 output.Display-memory 22 makes the gray scale video data of each pixel that computer installation 3 supplied with preserve corresponding to the address of pixel (point).D/A converter 21 is that the D/A converter (D/Aa, D/Ab) that each output can be exported the ability of two big or small electric currents is constituted, and the gray scale video data high precision of the numerical data of reading according to each pixel address in display-memory 22 is transformed into corresponding current value.D/A converter 21 is in official hour, only exports Iout simultaneously by the number (counting of horizontal direction) of data line.Driving governor 2 and display circuit 1 comprise electronic installation of the present invention.The combination of display circuit 1 and driving governor 2 has the Presentation Function of image, is equivalent to comprise or do not comprise the e-machine of the present invention of computer installation 3.
Display circuit 1, for example constituted by low temperature polycrystalline silicon TFT α-TFT, by viewing area 10 at display image, selection of configuration line Vsn (1≤n≤N (N is a number of scanning lines)) is constituted at vertical direction configuration data line I datam (1≤m≤M (M is number of data lines (columns))) in the horizontal direction.Configuration image element circuit Pmn on each point of crossing of selection wire Vsn and data line Idatam.And display circuit 1 comprises and is used to select the sweep circuit 11,12 of any one selection wire and the current amplification circuit B of driving data lines.And 10 li in the viewing area, configuration is corresponding to selection wire, in order to control the luminous light emitting control line Vgn (not shown) of each image element circuit Pmn and corresponding to data line, to the power lead (not shown) of each image element circuit supply power.The light emitting control line is corresponding to control line of the present invention.Sweep circuit 11 and 12 control signals corresponding to control circuit 23 are selected any one selection wire Vsn, altogether to light emitting control line Vgn output led control signal.Current amplification circuit B comprises the current amplification circuit Bm corresponding to data line I datam corresponding to load device of the present invention.When D/A converter 21 is observed, when current amplification circuit B is located at the opposite side of data line, can bring into play appropriate effect, still, do not change under the prerequisite of total driving force of current amplification circuit B, also can decentralized configuration on data line.
In the above-described configuration, the gray scale video data of each pixel of reading from display-memory 22 is transformed to corresponding current value D/A converter 21.If select any one selection wire Vsn, then for the image element circuit P xn that is connected its selection wire (1≤x≤M), write program current to each data line Ioutx output by sweep circuit 11 and 12.
Below, the groundwork of first embodiment of the present invention is described in conjunction with Fig. 2.Fig. 2 is illustrated in to be configured in the rectangular point (pixel), the image element circuit Pmn that is selected by selection wire Vsn corresponding to data line, to the steady current output circuit CIm and the current amplification circuit Bm of its supplying electric current.Steady current output circuit CIm comprises two D/A converters that the first and second steady current output circuit D/AaD/Ab are formed, and can selectivity supplies with greater than the amplified current (the second steady current output circuit D/Ab exports) or the above-mentioned program current of program current (the first steady current output circuit D/Aa exports) or selects two simultaneously.Amplified current can be more than several times of program current, preferably tens times.
As shown in Figure 2, in the present embodiment, control circuit is the early stage during being used for supplying with program current current programmed, and image element circuit Pmn is supplied with amplified current at least, in the later stage during this is current programmed, supplies with program current at least.Particularly, in the early stage during current programmed, make the first on-off element Swa that constitute to select feedway be in non-on-state and second switch element Swb is in on-state; And, make current amplification circuit Bm work, supply to data line Iout by the amplified current that is generated among the second steady current output circuit D/Ab.At this moment, as long as the ratio of the steady current fan-out capability between the first steady current output circuit D/Aa and the second steady current output circuit D/Ab is equaled the ratio of the electric current competence power between image element circuit Pmn and the current amplification circuit Bm, the voltage of data line changed according to the time of the parasitic capacitance value of output current value and data line, when supplying with program current, be stabilized near the magnitude of voltage that reach.At this moment, cut off second switch element Swb and connect the first on-off element Swa, supply with the program current that comes high precision to generate by the first steady current output circuit D/Aa to data line Ioutm.Because this work, as load, can rapidly, correctly arrive voltage Vgs between the grid-source of the transistor T 1 (Fig. 3) in the image element circuit that arrives when the first steady current output circuit D/Aa supplies with program current to image element circuit.
Like this, among the present invention, in the early stage during current programmed, by supply and the proportional big electric current of program current more than the program current several times, than the method for only supplying with program current or certain hour pre-charge, the voltage of data line Ioutm is more early reached near the voltage of regulation.
In addition, in the later stage during current programmed, the close current amplifying circuit is only supplied with the original program current that high precision generates in the silicon driving governor 2 to image element circuit simultaneously, can finally programme with correct program current value.
In addition, in the present embodiment, only allow and flow through amplified current, still, consider program current less than amplified current in early stage, also can supply with amplified current during in the while also supply with program current, image element circuit is not connected with data line.
Fig. 3 represents the formation of driving circuit more specifically.Fig. 3 represents to be configured to rectangular one 3 image element circuit Pmn and supplies with steady current output circuit CIm and current amplification circuit Bm corresponding to the electric current of gray scale video data to this image element circuit.
Image element circuit Pmn comprises: keep the current value of the program current that data line supplies with and drive the circuit of electrooptic element with the current value that keeps, promptly be equivalent to make the circuit of the luminous current programmed mode of EL element.
As shown in Figure 3, image element circuit is to be connected into as shown in Figure 3 by the switching transistor T4 that is connected between the switching transistor T3 that is connected between analog current storer (T1, T2, C1), EL element OELD, analog current storer and the data line and analog current storer and the EL element to constitute.
In the formation of this image element circuit, if selection wire Vsn is selected during current programmed, then transistor T 2 and T3 become on-state.If transistor T 2 and T3 become on-state, then transistor T 1 arrives normal condition after the time corresponding to program current, and storage is corresponding to the voltage Vgs of Ioutm in capacitor C1.During showing, in (between light emission period), as nonselection mode, make selection wire Vsn transistor T 2 and T3 be in dissengaged positions, in case after the steady current on the cut-out data line, select light emitting control line Vgn.Its result, transistor T 4 becomes on-state, be stored in the corresponding steady current Iout of the voltage Vgs of capacitor C1 and supply to EL element through transistor T 1 and T4, organic EL OELD comes luminous with the brightness corresponding to the gray scale of this corresponding program current.
In addition, the image element circuit of representing among Fig. 3 is an example only, as long as circuit that can be current programmed can adopt other circuit to constitute.
Steady current output circuit C Im comprises a pair of D/A converter that is made of the first current output circuit D/Aa and the second current output circuit D/Ab, constitutes to select to supply with amplified current or a side in program current or two sides bigger than program current.Particularly, being used to supply with the second current output circuit D/Ab that the first current output circuit D/Aa of program current and being used to supplies with amplified current is connected in parallel on data line Ioutm and constitutes.The ratio of the current driving ability between the first current output circuit D/Aa and the second current output circuit D/Ab preferably sets the transistor T 1 that becomes to be equal in the image element circuit and the ratio of the current driving ability between the transistor T 33 in the current amplification circuit.At this moment, because transistor T 1 and T33, transistor T 2 and T31 set in the zone of saturation and work.By allowing the ratio of this current driving ability equate, current amplification circuit as load device, the data line voltage that the second current output circuit D/Ab is arrived when data line is supplied with amplified current, no better than with image element circuit as load, the grid-voltage between source electrodes Vgs of the transistor T 1 that the first current output circuit D/Aa is arrived when supplying with program current.Because current amplification circuit not the receptor site area restriction and adopt the large-size crystals pipe, in all gray scales, amplified current can become the value more than the several times to tens times of program current.Its result becomes in the small low gray areas at program current, and the voltage that also can very fast change data line or the grid-voltage between source electrodes Vgs of transistor T 1 are the value of regulation.
Current amplification circuit Bm among the current amplifier B comprise with D/A converter 21 in the CIm collaborative work of steady current output circuit and in data line, flow through the formation of amplified current.Particularly, comprise transistor T 31～T33.Transistor T 33 is an amplifier transistor, and transistor T 31 is on-off elements, and it makes transistor T 33 in the constant current region conducting according to amplifying enable signal BE.Transistor T 32 is when supplying with the charging cut-off signals, and forced electric discharge is stored in the electric charge on the grid of transistor T 33, the transistor that cuts off amplifier transistor T33 fully.As mentioned above, the electric current fan-out capability of amplifier transistor T33 and the ratio of the electric current fan-out capability of the transistor T 1 of image element circuit preferably equal the ratio of electric current fan-out capability with the electric current fan-out capability of the first current output circuit D/Aa of the second current output circuit D/Ab.
During this constitutes, export simultaneously to each display-memory output Mdata: at the gray scale video data corresponding to the point (pixel) of a scan period of a horizontal line amount from display-memory 22.Two current output circuit D/Aa and D/Ab accept this gray scale video data, based on common reference current source, generate program current and amplified current.If supply with write-enable signal WEa or WEb, then transistor T Ia or TIb become on-state, export program current or export amplified current simultaneously to data line from each electric current output transform circuit.
Below, describe the work of first embodiment shown in Fig. 3 in detail in conjunction with the sequential chart of Fig. 4.The sequential chart of Fig. 4 is to sweep trace n, shows with in a plurality of horizontal scan period of image duration, to carry out a figure that horizontal scan period H is the center of current programmed usefulness at composing images.Be equivalent to during this 1H current programmed during.During this is current programmed, control circuit makes light emitting control line Vgn become non-on-state, stops the luminous of organic EL OELD.Each scan period to display-memory output line Mdata output gray scale video data corresponding to each pixel.
So, in moment t1, if display-memory output line Mdatam transmits the gray scale video data Dm (n-1) of relevant pixel Pm (n-1), then D/A converter (current output circuit) generates corresponding program current and amplified current to its acceptance.
After moment t2, to beginning the early stage during sweep trace n current programmed.Control circuit makes write-enable signal WEb become License Status behind moment t2.Thus, export amplified current from the second current output circuit D/Ab to data line Ioutm.Because all pixels of sweep trace n are supplied with this write-enable signal simultaneously, to the data line Ioutm of each pixel output electric current separately.Because this amplified current,, the voltage of data line is reached near the target current value even to be the target current value little and need the situation of time in the plan for the little situation of display gray scale.During finishing to amplify in moment t3, then control circuit makes write-enable signal WEb become non-License Status, stops the supply by the amplified current of the second current output circuit D/Ab.Then, when making restoring signal WEa become License Status, make selection wire Vsn become selection mode, during the remaining later stage (t3～moment t4 constantly) during current programmed, only utilize program current to image element circuit Pmn supplying electric current.Thus, can correctly plan the final objective current value.
If in moment t4, finish current programmed during, when control circuit makes selection wire become nonselection mode, make light emitting control line Vgn become selection mode, on the organic EL OELD of image element circuit Pmn,, transfer to during the demonstration by electric current.At this moment, because end is owing to the programming of new current value in image element circuit Pmn, to organic EL OELD supplying electric current, organic EL OELD is to come luminous corresponding to its new brightness with new current value.Its result, according to the difference of brightness, the gray scale of display pixel Pmn.
As above, according to first embodiment, even in the little low gray scale viewing area of program current, also can use the amplified current bigger, thereby can get rid of the influence of write time deficiency or noise than program current value, can the good distinct image of display reproduction.
In addition, if utilize the method for first embodiment, because can be written in image element circuit to program current at a high speed, such as, the method that electric current that driving circuit mode of the present invention is housed latchs is set between D/A converter and image element circuit, can cuts apart multiple mode by the time and write program current corresponding to a plurality of pixels.Thus, can significantly reduce the connection driving governor 2 shown in Figure 1 and the data line of display circuit 1.This mode is exactly following second embodiment of the present invention.
＜the second embodiment 〉
Second embodiment of the present invention is to further develop the electronic installation shown in aforesaid first embodiment and the mode of e-machine.
Formation, Fig. 8 of the concrete electronic installation of expression second embodiment represent to illustrate the sequential chart of its work among Fig. 5.Fig. 5 represents to carry out a colour element PmnC that look shows, to electric current latch cicuit Lm, D/A converter CIm and the current amplification circuit Bm of its colour element supplying electric current.Each image element circuit, current amplification circuit are identical with first embodiment with the piece (dotted line is represented) of steady current output circuit (D/A converter) CI m, therefore, carry out simple declaration.In addition, the circuit diagram of expression electric current latch cicuit Lm among Fig. 7.
In the present embodiment, following point is different with first embodiment.At first, electric current latch cicuit Lm newly is arranged between D/A converter CIm and the image element circuit Pmn.That is, the electronic installation according to type of drive work of the present invention is made of D/A converter CIm, electric current latch cicuit Lm, image element circuit PmnC and current amplification circuit Bm.
Electric current latch cicuit Lm has: and the function of the collaborative current supply arrangement of D/A converter CIm and latch and export the function of the steady current that D/A converter CIm exported.In addition, electric current latch cicuit Lm has: between D/A converter CIm and electric current latch cicuit Lm, cut apart with the time multiple mode serial transfer, corresponding to the electrical signal conversion of final program current for the function exported after parallel with in image element circuit, guarantee the double buffering function of current programmed time to greatest extent.Particularly, in second embodiment, represented for the gray scale video data of three primary colors R (red), G (green) that colour shows, B (indigo plant) example as a processed in units.But the present invention is not limited to this.
Colour element PmnC is that the image element circuit by the primary colors number constitutes.Here, image element circuit PmnR, PmnG and the PmnB that corresponds respectively to R (red), G (green), B (indigo plant) constitutes a colour element PmnC.Each image element circuit has same formation, shown in first embodiment of the present invention, have: keep the current value of the program current that data line supplies with and utilize the current value that keeps make electrooptic element be EL element luminous, corresponding to the circuit of current programmed mode.
Current amplification circuit BmR, G, B have the same circuit formation equal with circuit shown in first embodiment, have with electric current latch cicuit Lm and work in coordination with, and make amplified current flow through the formation of data line.The ratio of the electric current fan-out capability of amplifier transistor T33 and the electric current fan-out capability of the transistor T 1 of image element circuit preferably equals the ratio of electric current fan-out capability and the electric current fan-out capability of program current output transistor T10 of the amplified current output transistor T20 of electric current latch cicuit Lm.
More than, in the formation of the electronic installation of second embodiment, a horizontal period is divided into during three unillustrated display-memory (with reference to Fig. 1) from figure, after the gray scale video data time of R, G, B cut apart, to each display-memory output line Mdatam output.Among the D/A converter CIm, two the first current output circuit D/Aa and second current output circuit D/Ab as D/A converter accept this gray scale video data, generate program current and amplified current based on common reference current source.If during each time is cut apart, supply with write-enable signal WEa or WEb, then among the D/A converter CIm, illustrated as Fig. 3, transistor T 10 or T20 become on-state, export program current or amplified current to continuous data line Ioutm as the simulation video data from each current output circuit.Same with first embodiment, in each serial data line Sdatam, preceding during the time is cut apart partly is to supply with amplified current to electric current latch cicuit Lm.During this time later half, only supply with program current, latch at electric current and temporarily in the Lm keep correct current value.Thus, from driving governor 2 can be fast, correctly transmit program current to display circuit 1, the ratio of cutting apart multiple degree (being 1/3) here with time arbitrarily reduces the number of jointing simultaneously.
Here, describe the double buffering structure of the electric current latch cicuit Lm of second embodiment in detail.The double buffering principle of work of present embodiment is described in conjunction with Fig. 6.Electric current latch cicuit Lm has the double buffering structure of two similar circuit to a data line Ioutm output possible configuration.The electric current latch cicuit is corresponding to a data line a pair of electric current latch cicuit to be set.That is, data line Ioutm is connected electric current latch cicuit group Lmx and Lmy side by side.In Fig. 5, electric current latch cicuit group Lmx is by electric current latch cicuit LmRx, LmGx and LmBx in passing, and electric current latch cicuit group Lmy is made of electric current latch cicuit LmRy, LmGy and LmBy.The a pair of Lmx that becomes each electric current latch cicuit group is connected identical serial data line Sdatam with Lmy, still, can be latched in latch enable signal LEx and the next simulated data to serial data line output of LEy that the different time enables.Even in the same electric current latch cicuit group, the electric current latch cicuit of different pixels (such as LmRx and L (m+1) Rx) is to be connected different serial data line Sdata.Control circuit 23 (with reference to Fig. 1) carries out following control: adjust the time that allows signal WE and latch enable signal LE that writes respectively, during a latch cicuit group latched above-mentioned input simulated data, another latch cicuit group was to data line Iout output program current.That is, because first scan period of Fig. 6 writes and allows signal WEx to become non-enable state and latch enable signal LEx becomes enable state, electric current latch cicuit group Lmx latchs the simulated data of serial data line Sdatam.On the other hand, in this first scan period, allow signal WEy to become enable state and latch enable signal LEy becomes non-enable state because write, in the time of the latching of electric current latch cicuit group Lmy forbidden data, to the current value of data line IoutA, data line IoutB output corresponding to the simulated data of inner lock storage.Next in second scan period, in both sides' current output circuit group counter-rotating this latch and electric current output between relation.Repeatedly should operation because can guarantee one sweep time the area of a room the current programmed time to a pixel, in the slow TFT circuit of switching speed, the also effective image element circuit program function of performance amplification mode of the present invention.
Below, the work that describes second embodiment shown in Fig. 5 in detail in conjunction with sequential chart and Fig. 7 of Fig. 8.The sequential chart of Fig. 8 is to sweep trace n, in a plurality of horizontal scan period H that constitute the image duration that display image uses, is central representation with the transmission of simulation video data and two horizontal scan period (2H) of carrying out current programmed usefulness.Later half 1H during this 2H be equivalent to current programmed during.In the present embodiment, during this is current programmed in, control circuit makes light emitting control line Vgn be in nonselection mode, stops the luminous of organic EL OELD.
Cut apart with the time corresponding to the gray scale of each primary colors simulation video data and to output to serial data line Sdatam.Latch the first-half period (moment t1～t4) cut apart when being undertaken of the above-mentioned 2H of processing here by the multiple degree (being former chromatic number 3) of serial data line.Divided during each in, control circuit output latch enable signal is so that can latch corresponding to the data of primary colors separately.
That is, if in moment t1, relevant red simulation video data is sent to serial data line Sdatam, and then latch enable signal LERb becomes enable state.Thus, the transistor T 21 of the LmRx in the electric current latch cicuit group Lmx and T22 connect, and the amplified current of simulation video data DmnR flows to transistor T 20 from serial data line Sdatam.If latch enable signal LERb becomes non-enable state, the grid-voltage between source electrodes of the transistor T 20 of this moment remains on capacitor C3.Then, when latch enable signal LERa became enable state, serial data line Sdatam was converted to simulation video data DmnR program current.Become the moment t2 of non-enable state at latch enable signal LERa, for more accurate grid-voltage between source electrodes that program current is supplied with at transistor T 10 remains on capacitor C2.If end corresponding to the latching of the electric current of redness, same, carry out corresponding to the latching of the electric current of green DmnG, carry out latching from moment T2 corresponding to the electric current of blue DmnB from moment T3.If finish trichromatic latching, preceding half during current programmed of ending.On the other hand, current output circuit LmRy, LmGy, LmBy are during from moment T1 to t4 constantly, allow signal WEby and WEay to become enable state in front and back and write, to data line IoutR, IoutG, IoutB supply simulation video data Ioutm (n-1) R, Ioutm (n-1) G, Ioutm (n-1) B separately.
Then, after moment t4, just begin from electric current latch cicuit group Lmx during image element circuit PmnC current programmed.Control circuit makes to write and allows signal WEx to become enable state later at moment t4.Thus, till the front of moment t6, export amplified current to data line Ioutm from transistor T 20.In moment t4, finish the latching of current value of all relevant primary colors, all primary colors are supplied with this write-enable signal simultaneously, therefore, electric current output separately is at data line IoutmR, G, the B of each primary colors.Because this amplified current, even to be the target current value little and programming needs the situation of time for the little situation of display gray scale, the grid voltage of transistor T 1 is reached can be near the voltage of target current value.If during finishing amplification before the moment t6, then control circuit makes relevant amplified current write-enable signal WEbx become non-enable state, stops the supply by the amplified current of transistor T 20.When control circuit makes thereafter write-enable signal WEax become enable state, select selection wire Vsn, the electric current of image element circuit is write become enable state.(among the t6～t7), only supply with program current during the remaining current programmed later stage to image element circuit PmnC.Thus, can correct programming final goal current value.
In passing, to electric current latch cicuit group Lmy, carry out latching and writing as the same program current of above-mentioned current output circuit group Lmx in the time of the scan period of staggering.
If at moment t7, finish current programmed during, then control circuit makes light emitting control line Vgn be in selection mode, in the organic EL OELD of image element circuit Pmn by electric current, the transfer during showing.At this moment, because in image element circuit PmnR, G, B, the programming of being undertaken by the new current value from the corresponding data line finishes, and supplies with the electric current of new current value, and the organic EL OELD of corresponding look is to come luminous corresponding to its new brightness.Its result, because different trichromatic different brightness, the glow color of colour element PmnC changes, and can come luminous with new color.
According to above present embodiment, can significantly reduce the data line that connects driving governor 2 and display circuit 1, in addition, because data line can connect with the following low-density of the part of a distance, reduction manufacturing cost, high the becoming more meticulous with the height that is connected the hard-core display of spacing of reliability become possibility.
＜the three embodiment 〉
The 3rd embodiment of the present invention is in order to reach expansion gray scale (brightness) setting range of purpose of the present invention, possess the mode that further develops on the basis of second embodiment.Particularly in the 3rd embodiment, be conceived to organic EL and can carry out speed-sensitive switch with the order of magnitude of μ sec,, it is characterized in that utilizing the light emitting control line Vgn of the image element circuit shown in first embodiment and second embodiment, pulsed drive organic EL.
Fig. 9 represents that block diagram, Figure 10 of the driving circuit of the 3rd embodiment represent that principle key diagram, Figure 11 of the 3rd embodiment represent the sequential chart of the driving circuit of the 3rd embodiment.In Fig. 9,11, the part that is different from second embodiment be the light emitting control line Vgn of image element circuit and Vg (n-1) control method with being connected of image element circuit.In Fig. 9, at two sweep trace n of adjacency with (n-1), light emitting control line Vgn and Vg (n-1) intersect at each colour element.The colour element of level and vertical direction adjacency is to control between its light emission period with different light emitting control lines.During showing, between the light emitting control line Vgn and Vg (n-1) of this adjacency, supply with the pulsed illumination control signal of near each other or adjacency between light emission period.The umber of pulse of pulsed illumination control signal is a plurality of in an image duration preferably, still, also can be monopulse.Other circuit constitutes and work is same as second embodiment, omits its explanation.
The 3rd embodiment has following feature on principle of work.The luminous pulse controlled principle of work of the 3rd embodiment is described in conjunction with Figure 10.In the present embodiment, control circuit 23 (with reference to Fig. 1) be during showing in, supply with the pulse (led control signal) of phase reversal portion with near each other or adjacency to separately light emitting control line.According to such formation, abut against between the pixel Pxn and Px (n-1) of vertical direction (row), the pulse of being supplied with has the phase reversal portion of approaching or adjacency.In addition, each colour element that intersects at adjacency corresponding to a pair of light emitting control line Vgn and the Vg (n+1) of this a pair of sweep trace.According to such formation, between the colour element PmnC of adjacency horizontal direction (OK) and P (m+1) nC, also supply with have near or the pulse of the phase reversal portion of adjacency.Therefore, even utilize the light emitting control line, make organic EL flicker near frame rate, the variable domain of its brightness becomes tartan, and therefore the change of pixel adjacent compensate for brightness, can prevent the generation of the spinoff phenomenon of doubtful profile etc.In addition, the change of the pixel supply voltage of the open and close of the pixel of can cancelling each other can reduce the reduction that shows uniformity coefficient.
In the present embodiment, control circuit be during showing in, export the pulse of the dutycycle of regulation to the light emitting control line continuously and control.At this moment, because taked flicker to prevent countermeasure,, can not glimmer even change to the pulsed frequency of light emitting control line Vgn output separately.Also utilize the method that changes dutycycle (the pulse width of cloth), can regulate the brightness of pixel.In the low low gray scale viewing area of the brightness of pixel,, reduce S/N, show unsharp image sometimes, still,, utilize pulsed frequency or duty recently can reduce brightness according to the formation of present embodiment because the program current value is few.This means and do not change the program current value and change the pulsed frequency of light emitting control line or the method for dutycycle can be regulated all brightness of displayed map image planes.Thereby,, recently can carry out distinct image with high S/N and show even low gray scale viewing area and low brightness area do not diminish program current and also can finish.This formation can be independent of the amplification plan mode of first embodiment, second embodiment to be utilized, but the method for utilizing simultaneously, can obtain wideer gray scale (brightness) range of adjustment than the situation of independent utilization.
Below, in conjunction with the detailed operation of the sequential chart explanation of Figure 11 the 3rd embodiment shown in Figure 9.The sequential chart of Figure 11 is to sweep trace n and (n-1), in a plurality of horizontal scan period that constitute the image duration that display image uses, is central representation with two horizontal scan period H that carry out current programmed usefulness.
As shown in figure 11, the cycle of pulsed drive is suitably to be set at 1 of several branches from number μ s to the frame period according to display requirement.Thus, the mean flow rate of pixel can descend, therefore, in order to obtain identical brightness (gray scale), the electric current when preferably allowing the program current value greater than the situation of driving pulse not.
In electric current latch cicuit Lmx and Lmy separately, any one party during this 2H becomes and latchs during the processing, and the opposing party becomes during data line output is for the electric current that is latched of program current.This 2H latch during the processing and the electric current period of output between in (during current programmed), control circuit makes light emitting control line Vgn be in nonselection mode, stops the luminous of organic EL OELD.But must strictness stopping during luminous is to during image element circuit supplying electric current current programmed, to the processing of latching of electric current latch cicuit, is the luminous processing that continues parallel image element circuit, also is fine.Therefore, also can be different from control circuit by each sweep trace with led control signal stop luminous during.If finish during current programmed, control circuit makes light emitting control line Vgn be in selection mode, and electric current flows through the organic EL OELD of image element circuit Pmn.
According to the 3rd embodiment, the impulse phase of the led control signal of output between light emitting control line Vgn and the Vg (n-1) is reversed.Therefore, between the pixel of vertical direction between (PmnC and Pm (n-1) C), can not glimmer.In addition, because light emitting control line Vgn and Vg (n-1) intersect at each colour element, between (PmnC and P (m+i) nC), can not glimmer between the pixel of horizontal direction yet.And, utilize the pulsed frequency of change led control signal or the method for dutycycle, can control the brightness of viewing area.
＜the four embodiment 〉
Present embodiment is in the electronic installation of above-mentioned explanation, relates to the e-machine that possesses the electro-optical device that electronic component constituted that utilizes electrooptic element.
Represented to be suitable for the example of the e-machine of the electro-optical device 1 that possesses electronic installation of the present invention among Figure 12.
Figure 12 (a) is the example that is suitable in mobile phone, and this mobile phone 10 comprises antenna part 11, audio output unit 12, sound input part 13, operating portion 14 and electro-optical device 1.Like this, this electro-optical device can utilize the display part at mobile phone.
Figure 12 (b) is the example that is suitable in video camera, and this video camera 20 comprises and is subjected to picture portion 21, operating portion 22, sound input part 23 and this electro-optical device 1.Like this, this electro-optical device can be used in the display part of view finder or video camera.
Figure 12 (c) is the example that is suitable in the portable personal computer, and this computing machine 30 comprises camera section 31, operating portion 32 and this electro-optical device 1.Like this, this electro-optical device can be used in the display part of computing machine.
Figure 12 (d) is the example that is suitable in the head fixing display, and this head fixing display 40 comprises headband 41, optical system accommodation section 42 and this electro-optical device 1.Like this, this electro-optical device can be used in the image demonstration source of head fixing display.
Figure 12 (e) is the example that is suitable in the back-projection device, and this projector 50 comprises framework 51, light source 52, optics synthesis system 53, catoptron 5455 catoptrons, screen 56 and this electro-optical device 1.Like this, this electro-optical device can be used in the image demonstration source of rear-projected device.
The example that Figure 12 (f) forwardly is suitable in the projector, this projector 60 comprise optical system 61 and this electro-optical device 1 on the framework 62, and image be may be displayed on screen 63.Like this, this electro-optical device is forwardly used in the image demonstration source of projector.
Be not limited to above-mentioned example, the electro-optical device with electronic installation of the present invention can be applied in can the using active array display device all e-machines.Such as, operation board, the e-book of the information board of the facsimile unit of TV, car navigation system, POS, personal computer, band Presentation Function, electronic service guide plate, transport vehicles etc., game device, processing equipment and carry the machine that carries with TV, mobile phone etc.
＜other variation 〉
The invention is not restricted to above-mentioned embodiment, can carry out all distortion and implement.
For example, in first to the 3rd above-mentioned embodiment, corresponding to gray-scale displayed, changed fan-out capability as the amplified current supply circuit of second output unit, but a plurality of scopes that gray scale are divided into high, medium and low grade, change the fan-out capability of second output unit according to these, also can reach purpose of the present invention.At this moment, the central value of the arrival voltage of the data line that second output unit also can the prediction of output.When constituting like this, can not want current amplification circuit.And second output unit is as the D/A converter of voltage output type, makes the second output unit work early stage during current programmed, and the voltage of data line is reached near the target voltage; In later stage during current programmed, the formation of utilizing first output unit correctly to programme also is fine.
In addition, the conversion switch circuit of the same time service identical with amplifier transistor T33 shown in Figure 3 is arranged on the same active base plate that forms amplifier transistor T33 and is selecting between feedway and the data line, high precision time is changed first output and second output, also is fine.
According to the present invention, has following advantage at least.
According to the present invention, export can because select first output or second output or select simultaneously two The formation of energy according to the purpose of drive circuit, can be supplied with on the basis of first output complementaryly Second exports to substitute first output. For example, in requiring current programmed display unit, use this When bright, even in the little low gray scale viewing area of program current, use greater than the programming electricity complementaryly The amplified current of flow valuve can be got rid of the impact of noise, image that can clear display. In addition, profit Can reach the target current value in the short time with this big electric current, because do not depart from objectives current value, can To show image with correct brightness.
According to the present invention, owing to have amplified current programing function and double buffering merit data wire setting Therefore the output device of energy, can greatly reduce the number of data wire. Therefore, the connection spacing is limited When application is of the present invention in the display unit of system, can realize the display unit of fine.
According to the present invention, because connect for having mutually in abutting connection with the pulse of supplying with between the pixel of vertical direction The change of brightness even the pulse amplitude variation is wide, also can be supplied in abutting connection with pixel by the phase reversal section of near or adjacency, Also can prevent the generation of glimmering. In addition, in the horizontal direction between the pixel of adjacency, because a pair of The light emitting control line is intersecting, and the pulse that is supplied to has the phase reversal section of approaching or adjacency, even pulse Amplitude variation is wide, and connecing pixel, also can to supply change and the vertical direction of brightness same, can prevent flicker Generation. In addition, can cancel each other because the caused pixel supply voltage of open and close of pixel Change can reduce the reduction of show uniformity. This pulse drive method can be independent of first to be implemented Mode and second embodiment utilize, and thus, can enlarge as the gray scale of purpose of the present invention (bright Degree) adjusting range.
According to the present invention as described above, electronic component is for example corresponding to the change of electrooptics inverting element Change the raising of efficient and the raising of aperture opening ratio, can in wider scope, control accurately gray scale and The brightness that shows. In addition, because can use program current at a high speed, for high resolution display In also effective.
Claims (7)
1, a kind of electro-optical device,
Comprise element circuit with electrooptic element and the data line that is connected with described element circuit;
A pair of described element circuit is connected on the described data line;
The either party who on each described element circuit, connects the pair of control line of the output of controlling each described electrooptic element;
Supply with the control signal of antiphase portion with approaching mutually or adjacency to each described control line;
A pair of described control line intersects on the described element circuit of each adjacency.
2, electro-optical device according to claim 1 is characterized in that,
Export pulse continuously to described control line with given dutycycle.
3, electro-optical device according to claim 1 is characterized in that,
To constitute one group to the described element circuit of determined number;
Described control signal to the described element circuit of contiguous set is supplied with between described contiguous set, has the antiphase of approaching or adjacency.
4, a kind of electro-optical device,
A pair of element circuit with electrooptic element is connected on the data line;
On each described element circuit, connect the either party of pair of control line who controls the output of each described electrooptic element according to given dutycycle;
Supply with the control signal of antiphase portion with approaching mutually or adjacency to each described control line;
A pair of described control line intersects on the described element circuit of each adjacency.
5, according to each described electro-optical device in the claim 1～4, it is characterized in that,
Described electrooptic element is a current driving element.
6, a kind of e-machine possesses each described electro-optical device in the claim 1～5.
7, a kind of driving method of electro-optical device,
Described electro-optical device comprises element circuit with electrooptic element and the data line that is connected with described element circuit;
In the group of the described element circuit of adjacency or described element circuit, according to have between mutual active period near or the control line controlled with given dutycycle like that of the antiphase of adjacency intersect on the described element circuit of each adjacency.
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| Application Number | Priority Date | Filing Date | Title |
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| JP2002123036 | 2002-04-24 | ||
| JP2002123036 | 2002-04-24 | ||
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| CNB038012529A Division CN100345177C (en) | 2002-04-24 | 2003-04-24 | Electronic device, electronic apparatus, and method for driving electronic device |
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| CN100587780C true CN100587780C (en) | 2010-02-03 |
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| GB2460018B (en) * | 2008-05-07 | 2013-01-30 | Cambridge Display Tech Ltd | Active matrix displays |
| KR102636682B1 (en) * | 2016-12-21 | 2024-02-15 | 엘지디스플레이 주식회사 | Display device and driving method therof |
| KR102321174B1 (en) * | 2018-05-08 | 2021-11-03 | 애플 인크. | Memory-in-pixel display |
| TWI781512B (en) * | 2021-01-12 | 2022-10-21 | 友達光電股份有限公司 | Pixel driving device |
| WO2022222134A1 (en) * | 2021-04-23 | 2022-10-27 | 京东方科技集团股份有限公司 | Pixel circuit and driving method therefor, and display device |
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