CN1622148A - Active matrix system, circuit and drive method therefor of organic light emitting diode display - Google Patents
Active matrix system, circuit and drive method therefor of organic light emitting diode display Download PDFInfo
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Abstract
The present invention is active matrix system, circuit and drive method of organic LED display. The drive circuit is one active matrix circuit unit including one storing capacitor. The control method includes one horizontal line signal to control the control end of the switch unit in the active matrix structure and thus the drain current of the drive transistor with the common electrode being applied with one fixed voltage. During discharge period, the switch unit is in off state, the control end is negative and the common electrode is one even lower negative voltage; and in the display period, periodic positive pulse is input. One other vertical line signal is provided; in the discharge period, the identical grey datan is input to the switch unit in the active matrix structure; and in the display period, the grey data for displaying picture is input. Then, one periodic voltage is input to the common electrode and one negative voltage is coupled to gate in the discharge period to eliminate the residual charge in the display.
Description
Technical field
The present invention relates to a kind of active-matrix circuit and driving method thereof, particularly relate to a kind of discharge cycle that utilizes, active-matrix system, circuit and the driving method thereof of the organic light emitting diode display of the remaining phenomenon of driving transistors electric charge in the light emitting diode of improvement amorphous silicon film transistor structure.
Background technology
Usually in the flat-panel screens field, the display made from Organic Light Emitting Diode has its superior part.Organic Light Emitting Diode is to be deposited on the substrate with the amorphous silicon organic film, and cheaper photoelectric material can be provided; The film of Organic Light Emitting Diode has characteristic as thin as a wafer in addition, therefore can reach preferable light peneration, and the light utilization rate is higher, is specially adapted to large tracts of land and shows.
The main drive principle of organic light emitting diode display is the same with LCD, is the active matrix drive mode, but it is to control the magnitude of current that flows through diode to produce different GTGs.Because LCD can't be stood in the environment that the liquid crystal two ends operate in DC voltage, thus need drive liquid crystal with the principle of positive-negative polarity, and with the size decision GTG of pressure reduction.For the liquid crystal material of non-light emitting source,, then need backlight to produce GTG because of the difference of pressure reduction makes the LCD penetration difference.
Yet Organic Light Emitting Diode is a current driving element, and its luminous intensity is proportional to the current density that is flow through.Drive the mode of Organic Light Emitting Diode at present, generally can be divided into passive-matrix and active matrix drive framework.And the active matrix drive mode because of more efficient, generally is used for full-color organic light emitting diode display.
Organic light emitting diode display typically uses amorphous silicon film transistor active matrix drive framework, and the size of current that control is flow through produces GTG.Yet in field of transistors, amorphous silicon film transistor is unsound structure, wherein include only N type pass element, and the electric charge mobility is quite low.In the active-matrix framework, need to finish the target of being wanted with N type pass element, generally traditional organic LED array comprises a thin film transistor (TFT) as switch, and one then as the thin film transistor (TFT) of drive current.Because of Organic Light Emitting Diode all operates in the diode current flow state, thus at the gate of driving transistors the remaining phenomenon of electric charge is arranged, and influence the fiduciary level of drive current.
See also shown in Figure 1.It is the drive system synoptic diagram that has known organic light emitting diode display now.Generally having now in the mode of traditional driving organic light emitting diode display, be to use the method for continuous demonstration, as shown in Figure 1, it comprises a scanning driving device 102, data drive unit 101, common pole (VCOM) 141, switching transistor 131, driving transistors 133 and a capacity cell 134.If in general conventional ADS driving mode, sharedly very 141 be fixed on the V2 current potential, when scanning driving device n bar horizontal line is exported 112 lines, promptly during G (n), time point t1, output VGG current potential.Make transistor 131 conductings, X (n) is V1, and striding electric capacity pressure drop VCs is V1-V2.When proceeding to time point t3, G (n) output VEE current potential is closed transistor 131, and X (n) still is the V1 current potential, and driving transistors 133 all operates in positive voltage.
Therefore need a driving framework, for example use the gate that remains in driving transistors in the discharge cycle with electric charge, make amorphous silicon film transistor in general traditional framework, can drive and improve the fiduciary level of color organic light emitting diode displays, and prolong the serviceable life of Organic Light Emitting Diode.
This shows.Active matrix drive system, circuit and the method thereof of above-mentioned existing organic light emitting diode display still have many defectives, and demand urgently further being improved.Defective for the active matrix drive system, circuit and the method thereof that solve existing organic light emitting diode display.Relevant manufacturer there's no one who doesn't or isn't seeks solution painstakingly, but does not see always that for a long time suitable design finished by development, and this obviously is the problem that the anxious desire of relevant dealer solves.
Because the defective that the active matrix drive system of above-mentioned existing organic light emitting diode display, circuit and method thereof exist, the inventor is based on being engaged in this type of product design manufacturing abundant for many years practical experience and professional knowledge, actively studied innovation, in the hope of founding a kind of new organic light emitting diode display driving method and circuit thereof, can improve active matrix drive system, circuit and the method thereof of existing organic light emitting diode display, make it have more practicality.Through constantly research, design, and after studying sample and improvement repeatedly, create the present invention who has practical value finally.
Summary of the invention
The objective of the invention is to, overcome the defective of active matrix drive system, circuit and the method existence thereof of existing organic light emitting diode display, and a kind of active matrix drive system, circuit and method thereof of new organic light emitting diode display, technical matters to be solved are provided is to make it use in discharge cycle and electric charge remains in the gate of driving transistors.Make amorphous silicon film transistor in general traditional framework, can drive and improve the fiduciary level of color organic light emitting diode displays, thereby be suitable for practicality more, and have the value on the industry.
Another object of the present invention is to, a kind of active matrix drive system, circuit and method thereof of organic light emitting diode display are provided, technical matters to be solved is that the amorphous silicon film transistor degradation is alleviated, and can prolong the serviceable life of the organic light emitting diode display of amorphous silicon film transistor.
The object of the invention to solve the technical problems is to adopt following technical scheme to realize.The active-matrix circuit drive method of a kind of organic light emitting diode display that proposes according to the present invention, wherein an active circuits device has at least one capacity cell, one switchgear, one driving transistors, an and Organic Light Emitting Diode, this switchgear wherein, this driving transistors and this electric capacity are coupled to a first node, the drain of this driving transistors couples one and drives high bias voltage, source electrode couples the anode of this Organic Light Emitting Diode, negative electrode couples one and drives low bias voltage, a this capacity cell wherein end is coupled to the gate of this driving transistors, the other end is coupled to a common pole, to control the source of the drawing electric current of this driving transistors, one horizontal line signal is used to control a control end of this switchgear, reach a vertical signal, the input end one GTG data of this switch is provided; The active-matrix circuit drive method of this organic light emitting diode display comprises: in discharge cycle input one-period property positive pulse, making this switchgear is conducting state; Import the input end of this GTG data, and conducting stores this GTG data to the output terminal of this switchgear by this capacity cell to this switchgear; Import a fixed voltage to this common pole; When this positive pulse transition was one first negative pressure, making this switchgear was closed condition, and the control end of this switchgear couples this first negative pressure, and the signal transition of this common pole is one second negative pressure; This perpendicular line signal is imported the input end of this GTG data to this switchgear of this active matrix configuration; And import this periodicity positive pulse in a display cycle, this GTG data of this vertical signal input display frame.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
The active-matrix circuit drive method of aforesaid organic light emitting diode display, wherein said horizontal line signal, this perpendicular line signal, and this display cycle of this common pole signal and this discharge cycle time interval are vertical synchronizing signal cycle.
The active-matrix circuit drive method of aforesaid organic light emitting diode display wherein provides a common pole signal, is coupled to this common pole, is input one-period property voltage, makes this driving transistors gate couple this first negative pressure at this discharge cycle.
The active-matrix circuit drive method of aforesaid organic light emitting diode display, wherein said shared very one second horizontal signal.
The active-matrix circuit drive method of aforesaid organic light emitting diode display, wherein said horizontal line signal and this perpendicular line signal are this discharge cycles of this vertical synchronizing signal frequency domain partly, produce this horizontal line signal and this perpendicular line signal that shows with this discharge cycle with logical operation.
The active-matrix circuit drive method of aforesaid organic light emitting diode display, wherein said perpendicular line signal couple earth potential when this discharge cycle.
The active-matrix circuit drive method of aforesaid organic light emitting diode display, wherein said perpendicular line signal is after this common pole of this discharge cycle is imported this cycle positive pulse end, and this perpendicular line signal couples a high impedance current potential.
The active-matrix circuit drive method of aforesaid organic light emitting diode display, wherein import this wide periodicity positive pulse of single horizontal synchronization signal cycle in this display cycle, it is wide to import a plurality of horizontal synchronization signal cycle at this discharge cycle, wherein the overlapping wide periodicity positive pulse of a horizontal synchronization signal cycle of each adjacent those horizontal line.
The object of the invention to solve the technical problems also adopts following technical scheme to realize.The active-matrix circuit of a kind of organic light emitting diode display that proposes according to the present invention, it comprises: one first horizontal line is the signal line that is used to control one first switchgear, connects the control end of this first switchgear; One second horizontal line; One the 3rd horizontal line is the signal line that is used for one the 3rd gauge tap device, connects the control end of one the 3rd switchgear; One perpendicular line is to transmit a GTG data, is coupled to the input end of this first switchgear; One capacity cell is to be used to store this GTG data; One first switchgear is the turnover of this GTG data of control, and output terminal couples the positive pole of this capacity cell; One second switch device, wherein an input end connects this capacity cell negative pole, and control end connects this first horizontal line, and output terminal connects this second horizontal line; One the 3rd switchgear, input end connect this capacity cell negative pole, and control end connects the 3rd horizontal line, and output terminal connects this second horizontal line; One driving transistors device is to be used to drive this organic light-emitting diode element, and drain couples one and drives high bias voltage, and source electrode couples the anode of this Organic Light Emitting Diode, and gate connects output terminal and this capacity cell positive pole of this first switchgear; And an organic light-emitting diode element, anode couples the source electrode of this driving transistors device, and negative electrode couples one and drives low bias voltage.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
The active-matrix circuit of aforesaid organic light emitting diode display, wherein said first switchgear, this second switch device, and the 3rd switchgear be single amorphous silicon film transistor element.
The active-matrix circuit of aforesaid organic light emitting diode display, the positive pulse of the wherein said first horizontal signal and this second horizontal signal is not overlapping mutually when this display cycle, overlapping half pulse width when this discharge cycle, and the phase place of the 3rd horizontal signal and this second horizontal signal is anti-phase each other.
The object of the invention to solve the technical problems also realizes by the following technical solutions.The active-matrix system of a kind of organic light emitting diode display that proposes according to the present invention, it comprises at least: an Organic Light Emitting Diode active-matrix comprises a plurality of Organic Light Emitting Diode active members; At least one data drive unit provides a plurality of perpendicular line signals, to import a plurality of pixel gray level values of those Organic Light Emitting Diode active members; One sequential control device provides a plurality of sequential control signals and a plurality of controlling signal to this data drive unit at least; And one scan drive unit, provide a plurality of horizontal line signals the light emitting diode active member to be arranged to those, with gated sweep line current potential, wherein the positive pulse of those horizontal signals is not overlapping mutually when a display cycle, overlapping half pulse width when this discharge cycle.
The present invention compared with prior art has tangible advantage and beneficial effect.By above technical scheme as can be known, in order to reach aforementioned goal of the invention, major technique of the present invention thes contents are as follows:
The present invention proposes a kind of active matrix drive system, circuit and method thereof of organic light emitting diode display, wherein the main drive principle of Organic Light Emitting Diode is the same with LCD, be the active matrix drive mode, but it is to control the magnitude of current that flows through diode to produce different GTGs.Because LCD can't be stood in the environment that the liquid crystal two ends operate in DC voltage, thus need drive liquid crystal with the principle of positive-negative polarity, and with the size decision GTG of pressure reduction.For the liquid crystal material of non-light emitting source,, need backlight to produce GTG because of the difference of pressure reduction makes the LCD penetration difference.And the display system of a new generation, organic light emitting diode display is a self-emitting light source, do not need backlight panel, by the electric density decision GTG size that flows through diode, also can be by the length decision brightness of conducting diode time, so organic light emitting diode display is that action is on the driving voltage of positive polarity.
When amorphous silicon film transistor drives with positive voltage always, can cause electric charge to remain in the amorphous silicon film transistor gate, so that electric crystal deterioration, make the relation drift of driving voltage and drive current, therefore the method that the invention provides changes type of drive, the amorphous silicon film transistor degradation is alleviated, to prolong the organic light emitting diode display of using amorphous silicon film transistor.
Organic Light Emitting Diode circuit of the present invention is the circuit framework that generally is applied to the light emitting diode of display, wherein in order to increase the aperture opening ratio of display element, can omit having known common pole lead now, and substitute to be coupled to next bar horizontal line (being sweep trace).And the array that this display element is formed, its circuit more comprises a data drive unit and a scanning driving device.Should be total to gate organic light emitting diode display unit, comprising a switching transistor, a driving transistors, with a capacity cell, wherein this switching transistor, this driving transistors and this capacity cell are coupled on the first node.Add discharge cycle in drive system, wherein the vertical signal of data (being data) is a zero potential, and scanning driving device is exported periodically controlling signal in regular turn, overlaps each other in twos.When at very first time point, the n bar horizontal line output VGG current potential of scanning driving device, make the switching transistor conducting, the zero potential of the n bar perpendicular line of data drive unit output simultaneously, this first node also is a zero potential, because of next bar of another termination of storage capacitors element (being the n+1 bar) horizontal line, export the VEE current potential this moment, then strides electric capacity pressure drop VCs to be-VEE.When at second time point, n bar horizontal line is kept the output of VGG current potential, and n+1 bar horizontal line output VGG current potential is striden electric capacity pressure drop VCs and become-VGG, and this first node is still kept zero potential.When at the 3rd time point, n bar horizontal line output VEE current potential is closed switching transistor, and striding electric capacity pressure drop VCs still is-VGG that first node is a zero potential.When the 4th time point, n+1 bar output VEE current potential, striding electric capacity pressure drop VCs still is maintained-VGG, make the current potential of first node come down to VEE-VGG, VCs closes once more because of switching transistor up to the capacity cell cross-pressure, electric current diminishes and comes a Vt1 current potential, and the first node current potential finally becomes Vt2=VEE-VGG+Vt1.Time interval before discharge cycle finishes, the first node current potential is a negative potential always.
Active matrix drive system, circuit and the method thereof of one organic light emitting diode display also are provided among the present invention, comprise a time sequence control device, a scanning driving device, two data drive units, and a plurality of organic light emitting diode display unit forms an array (being array).Time sequence control device is exported to the signal of the required XCLK of data drive unit, LD, XDIO, DXX, DIS respectively, and connection gray scale voltage, supply with required YCLK, the YDIO signal of scanning driving device, wherein this drive system is divided into two cycles respectively: display cycle and discharge cycle.Wherein display cycle and discharge cycle hocket; When signal DIS is high levle, then enter the display cycle, the normal shown information (being information) of data drive unit output this moment, scanning driving device receives the YDIO signal, then by article one horizontal line, the second horizontal line, with the non-overlapped transmission of all period interval of YCLK time pulse signal, promptly the same time is only opened a horizontal line in regular turn.When DIS is low level, then enter discharge cycle, this moment, the data drive unit was exported zero potential or minimum gray scale information, scanning driving device receives the YDIO signal, then by article one horizontal line, the second horizontal line, two cycle interval overlappings with the YCLK time pulse signal transmit in regular turn, and promptly the same time is opened two horizontal lines.During can reaching, this method remains in the purpose of the gate of driving transistors with electric charge, the amorphous silicon film transistor degradation is alleviated, improve the fiduciary level of color organic light emitting diode displays, to prolong the organic light emitting diode display of using amorphous silicon film transistor.
General storage capacitors is in the gate active matrix configuration, can be in the display cycle because of the input of next bar horizontal line positive pulse, make present demonstration GTG data coupling and raise toward malleation, cause the blink display to brighten, yet the active-matrix circuit of the Organic Light Emitting Diode among the present invention, there is no this phenomenon and take place, improved the Organic Light Emitting Diode display quality.
The present invention provides active matrix drive system, circuit and the method thereof of an organic light emitting diode display again.Organic Light Emitting Diode unit wherein is between one first horizontal line and one second horizontal line.Two switching transistors of coupled in parallel between this capacity cell and sweep trace are respectively second switch transistor and the 3rd switching transistor in addition, and divide by second anti-phase each other controlling signal and the 3rd controlling signal controller.When putting in the very first time, second horizontal line is by negative pressure VEE transition output VGG current potential, this horizontal line still is negative pressure VEE, these two anti-phase signals, make those switching transistor conductings, the Vx of perpendicular line output simultaneously current potential, and this first node is the Vx current potential, because of the switching transistor of these two parallel connections of another termination of storage capacitors element, striding electric capacity pressure drop VCs is Vx-VEE.When second time point, first horizontal line is negative pressure VEE by malleation VGG transition, and second horizontal line closes these three switching transistors by negative pressure VEE transition output VGG current potential, strides electric capacity pressure drop VCs and still is Vx-VEE, and first node is a high impedance Vx current potential.When the 3rd time point, first, second horizontal line is all negative pressure VEE, makes the 3rd switching transistor conducting, and then Xn is VCs+VEE, is the Vx current potential.When the 4th time point, the display cycle is changed discharge cycle into, and Xn and electric capacity cross-pressure VCs all remain unchanged, up to the 5th time point.When at the 5th time point, this first horizontal line is the VGG current potential by negative pressure VEE transition, this second horizontal line still is negative pressure VEE, make this first, second, and the 3rd switching transistor conducting, the zero potential of perpendicular line output simultaneously, Xn is a zero potential, because of this second and the 3rd switching transistor of another termination of storage capacitors element, strides electric capacity pressure drop VCs and is-VEE.When the 6th time point, this first horizontal line is kept the output of VGG current potential, and this second horizontal line output is by negative pressure VEE transition output VGG current potential, make this first, second switching transistor conducting, close for the 3rd, stride electric capacity pressure drop VCs and become-VGG, X (n) still keeps zero potential.When the 7th time point, this first horizontal line is negative pressure VEE by malleation VGG transition, and this second horizontal line is kept VGG current potential output, make this first, second, and the 3rd switching transistor close, stride electric capacity pressure drop VCs and still be-VGG, Xn is the high impedance zero potential.When the 8th time point, this first, second horizontal line is all negative pressure VEE, makes the 3rd switching transistor conducting, and striding electric capacity pressure drop VCs is-VGG that then Xn is VCs+VEE, is the VEE-VGG current potential.Up to electric capacity cross-pressure VCs is the Vt1 current potential, and the Xn current potential finally becomes Vt2=VEE-VGG+Vt1.Time interval before discharge cycle finishes, the Xn current potential is a negative potential always.
Via as can be known above-mentioned, the invention relates to a kind of active matrix drive system, circuit and method thereof of organic light emitting diode display, be with an active-matrix circuit arrangement, utilize to comprise a storage capacitors in the common pole active matrix configuration; Its control method comprises a horizontal line signal, is used to control the control end of active matrix configuration switchgear, the source of the drawing electric current of may command driving transistors device.This moment, the common pole signal was arbitrary fixed voltage.Making switchgear when discharge cycle is closed condition, and this control end is a negative pressure, and this moment, the transition of common pole signal was the negative pressure also lower than last attitude.Then import non-overlapped periodicity positive pulse during the display cycle.In addition, provide a perpendicular line signal, import the input end of same GTG data, then import the GTG data of display frame in the display cycle to the active matrix configuration switchgear at discharge cycle.The common pole signal of this moment is the voltage of input one-period property, at the discharge cycle driving transistors gate negative voltage that is coupled.Therefore can improve the problem of electric charge remnants in the organic light emitting diode display.The present invention also provides an organic light emitting diode display drive system.
By technique scheme, the present invention remains in the electric charge of the gate of driving transistors because of utilizing the discharge cycle neutralization, make amorphous silicon film transistor in general traditional framework, the fiduciary level of color organic light emitting diode displays can be driven and improve, and the serviceable life of Organic Light Emitting Diode can be prolonged.
In sum, active matrix drive system, circuit and the method thereof of organic light emitting diode display of the present invention, use the gate that remains in driving transistors in the discharge cycle with electric charge, make amorphous silicon film transistor in general traditional framework, can drive and improve the fiduciary level of color organic light emitting two diode displays; The amorphous silicon film transistor degradation is alleviated, and can prolong the serviceable life of the organic light emitting diode display of amorphous silicon film transistor.It has above-mentioned many advantages and practical value, and in class methods and product, do not see have similar method and structural design to publish or use and really genus innovation, no matter it is in method, bigger improvement is all arranged on product structure or the function, have large improvement technically, and produced handy and practical effect, and the active matrix drive system of more existing organic light emitting diode display, circuit and method thereof have the multinomial effect of enhancement, thereby be suitable for practicality more, and have the extensive value of industry, really be a novelty, progressive, practical new design.
Above-mentioned explanation only is the general introduction of technical solution of the present invention, for can clearer understanding technological means of the present invention, and can be implemented according to the content of instructions, below with preferred embodiment of the present invention and conjunction with figs. describe in detail as after.
Description of drawings
Fig. 1 is the drive system synoptic diagram that has known organic light emitting diode display now.
Fig. 2 is according to the drive system synoptic diagram of the organic light emitting diode display that another preferred embodiments illustrated among the present invention.
Fig. 3 is according to the discharge cycle oscillogram of the drive system that preferred embodiments illustrated of Fig. 2 among the present invention.
Fig. 4 is according to the conventional ADS driving system sequence figure that drive system illustrated of Fig. 1 among the present invention.
Fig. 5 is the discharge cycle sequential chart of the drive system that illustrated according to a preferred embodiments among the present invention.
Fig. 6 is the drive system synoptic diagram of the organic light emitting diode display that illustrated according to a preferred embodiments among the present invention.
Fig. 7 is the drive system sequential chart of the organic light emitting diode display that illustrated according to a preferred embodiments among the present invention.
Fig. 8 is the active-matrix circuit diagram that is illustrated according to a preferred embodiment among the present invention.
Fig. 9 is the active-matrix drives system sequence figure of the Organic Light Emitting Diode that illustrated according to a preferred embodiment among the present invention.
100: organic light emitting diode display cell array 101: the data drive unit
102: scanning driving device 111-112: sweep trace
121-122: data line 131: transistor
132: Organic Light Emitting Diode 133: transistor
134: capacity cell 141: common pole (VCOM)
200: be total to gate organic light emitting diode display cell array 201: the data drive unit
202: scanning driving device 211-213: sweep trace
221-222: data line 231: transistor
232: Organic Light Emitting Diode 233: transistor
234: capacity cell
600: organic light emitting diode display cell array 601: the data drive unit
602: scanning driving device 603: the data drive unit
604: time sequence control device 811-812: sweep trace
821: data line 831: transistor
832: light emitting diode 833: transistor
834: capacitor 835: transistor
837: transistor
Embodiment
Below in conjunction with accompanying drawing and preferred embodiment, to organic light emitting diode display driving method and its concrete grammar of circuit, step, structure, feature and the effect thereof that foundation the present invention proposes, describe in detail as after.
See also shown in Figure 2, it is an active matrix drive circuit diagram of the present invention, with respect to the circuit in the existing known techniques, in order to increase the aperture opening ratio of display element, common pole lead among Fig. 1 can be omitted, be connected to next bar horizontal line, as shown in Figure 2, the active matrix drive system and the circuit thereof of this organic light emitting diode display, comprise a data drive unit 201, a scanning driving device 202 and common gate organic light emitting diode display unit 200, wherein should be total to gate organic light emitting diode display unit 200, include switching transistor 231, driving transistors 233 and capacity cell 234.Wherein this switching transistor 231 is the signal control that the one scan line 212 by one scan drive unit 202 is transmitted, and is connected between an information wire 221 and the nodes X (n).233 of this driving transistorss are connected between power vd D and the Organic Light Emitting Diode 232 by this nodes X (n) control.Again, this capacity cell 232 is to be connected between this node and another sweep trace 213.Similarly, at discharge cycle, scanning driving device 202 is exported periodically controlling signal G (n-1), G (n), G (n+1) in regular turn, represents with 211,212,213 respectively among the figure, so that the gating pulse signal overlaps each other in twos.
See also shown in Figure 3, when at time point t1, n bar horizontal line G (n) the output VGG current potential of scanning driving device 202, make switching transistor 231 conductings, the zero potential of the n bar perpendicular line of data drive unit 201 output simultaneously, X (n) is a zero potential, because of next bar horizontal line G (n+1) of another termination of storage capacitors element, export the VEE current potential this moment, strides electric capacity pressure drop VCs and reduce to-VEE.When time point t2, G (n) keeps the output of VGG current potential, and G (n+1) output VGG current potential is striden electric capacity pressure drop VCs and become-VGG, and X (n) still keeps zero potential.As time point t3, G (n) output VEE current potential is closed T1, and striding electric capacity pressure drop VCs is-VGG that X (n) is a zero potential.As time point t4, G (n+1) output VEE current potential is striden the electric capacity pressure drop and is still kept VCs and be-VGG, makes X (n) current potential come down to VEE-VGG, up to VCs because of T1 once more close current diminish and come the Vt1 current potential, X (n) current potential finally becomes Vt2=VEE-VGG+Vt1.Time interval before discharge cycle finishes, X (n) current potential is a negative potential always.
See also shown in Figure 5, when we add discharge cycle in drive system, scanning driving device 102 is exported periodically common pole signal simultaneously, changes signal in discharge cycle, is not set potential, when scanning driving device at time point t1, all horizontal line output VGG current potentials make the switching transistor conducting in all organic light emitting diode display unit, simultaneously all perpendicular line output zero potentials of data drive unit, X (n) is a zero potential, strides electric capacity pressure drop VCs to be-VGG.As time point t3, G (n) output VEE current potential is closed T1, and X (n) still is a zero potential.As time point t4, stride electric capacity pressure drop VCs and still be maintained-VGG, make X (n) current potential become VEE-VGG, up to VCs because of T1 once more close current diminish and come the Vt1 current potential, X (n) current potential finally becomes Vt2=VEE-VGG+Vt1.Time interval before discharge cycle finishes, X (n) current potential is a negative potential always.
See also shown in Figure 6, a preferred embodiments also provides the drive system of an organic light emitting diode display among the present invention, and it comprises a time sequence control device 604, scanning driving device 602, two data drive units 601,603 and organic light emitting diode display unit 600.Time sequence control device 604 is exported to the signal of the required XCLK of data drive unit, LD, XDIO, DXX, DIS respectively, and connection gray scale voltage, supply with scanning driving device 602 required YCLK, YDIO signal, wherein this drive system is divided into two cycles respectively: display cycle and discharge cycle.
See also shown in Figure 7ly, display cycle and discharge cycle hocket, and wherein the display cycle is n news frame and n+2 news frame, and discharge cycle is that n+1 interrogates frames; When signal DIS is high levle, then enter display cycle n news frame and n+2 news frame, the normal shown information of data drive unit output this moment, scanning driving device receives the YDIO signal, then by article one horizontal line, the second horizontal line, with the non-overlapped transmission of all period interval of YCLK time pulse signal, promptly the same time is only opened a horizontal line in regular turn.When DIS is low level, then enter discharge cycle, promptly n+1 interrogates frame, this moment, the data drive unit was exported zero potential or minimum gray scale information, scanning driving device receives the YDIO signal, then by article one horizontal line, and the second horizontal line, two cycle interval overlappings with the YCLK time pulse signal transmit in regular turn, and promptly the same time is opened two horizontal lines.This result as shown in Figure 3, remain in the gate of driving transistors in reaching with electric charge, the amorphous silicon film transistor degradation is alleviated, improve the fiduciary level of color organic light emitting diode displays, and can prolong the organic light emitting diode display of using amorphous silicon film transistor.
See also shown in Figure 2, general storage capacitors is in the gate active matrix configuration, can be in the display cycle because of the input of next bar horizontal line positive pulse, make present demonstration GTG data coupling and raise toward malleation, cause the blink display to brighten, newly design the active-matrix circuit of Organic Light Emitting Diode, as shown in Figure 8, there is no this phenomenon and take place, improved the Organic Light Emitting Diode display quality.
See also shown in Figure 9ly, the present invention provides the active-matrix drives system of an Organic Light Emitting Diode according to another preferred embodiment, and the display cycle is before t4.When at t1, horizontal line 812 (G2) is by negative pressure VEE transition output VGG current potential, horizontal line G2 still is negative pressure VEE, G2Z is the anti-phase signal of G2, make switching transistor 831,835,837 conductings, the Vx of perpendicular line output simultaneously current potential, Xn is the Vx current potential, because of another termination switching transistor 835 and 837 of storage capacitors element, striding electric capacity pressure drop VCs is Vx-VEE.When time point t2, horizontal line 811 (G1) is negative pressure VEE by malleation VGG transition, and horizontal line G2 closes switching transistor 831,835,837 by negative pressure VEE transition output VGG current potential, strides electric capacity pressure drop VCs and still is Vx-VEE, and Xn is a high impedance Vx current potential.As time point t3, horizontal line G1, G2 are all negative pressure VEE, make switching transistor 837 conductings, and then Xn is VCs+VEE, are the Vx current potential.When time point t4, the display cycle is changed discharge cycle into, and Xn and VCs all remain unchanged, up to time point t5.When at t5, horizontal line G1 is the VGG current potential by negative pressure VEE transition, and horizontal line G2 still is negative pressure VEE, make switching transistor 831,835,837 conductings, the zero potential of perpendicular line output simultaneously, Xn is a zero potential, because of another termination 835 and 837 of storage capacitors element, stride electric capacity pressure drop VCs and be-VEE.When time point t6, G1 keeps the output of VGG current potential, and G2 output makes switching transistor 831,835 conductings by negative pressure VEE transition output VGG current potential, closes for 837, strides electric capacity pressure drop VCs and becomes-VGG, and X (n) still keeps zero potential.When time point t7, G1 is negative pressure VEE by malleation VGG transition, and G2 keeps the output of VGG current potential, and switching transistor 831,835,837 cuts out, and striding electric capacity pressure drop VCs still is-VGG that Xn is the high impedance zero potential.As time point t8, horizontal line G1, G2 are all negative pressure VEE, make switching transistor 837 conductings, and striding electric capacity pressure drop VCs is-VGG that then Xn is VCs+VEE, is the VEE-VGG current potential.Up to VCs is the Vt1 current potential, and the Xn current potential finally becomes Vt2=VEE-VGG+Vt1.Time interval before discharge cycle finishes, the Xn current potential is a negative potential always.
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, though the present invention discloses as above with preferred embodiment, yet be not in order to limit the present invention, any those skilled in the art, in not breaking away from the technical solution of the present invention scope, when the method that can utilize above-mentioned announcement and technology contents are made a little change or be modified to the equivalent embodiment of equivalent variations, but every content that does not break away from technical solution of the present invention, according to technical spirit of the present invention to any simple modification that above embodiment did, equivalent variations and modification all still belong in the scope of technical solution of the present invention.
Claims (12)
1, a kind of active-matrix circuit drive method of organic light emitting diode display is characterized in that:
Wherein an active circuits device has at least one capacity cell, one switchgear, one driving transistors, an and Organic Light Emitting Diode, this switchgear wherein, this driving transistors and this electric capacity are coupled to a first node, the drain of this driving transistors couples one and drives high bias voltage, source electrode couples the anode of this Organic Light Emitting Diode, negative electrode couples one and drives low bias voltage, a this capacity cell wherein end is coupled to the gate of this driving transistors, the other end is coupled to a common pole, to control the source of the drawing electric current of this driving transistors, one horizontal line signal is used to control a control end of this switchgear, reach a vertical signal, the input end one GTG data of this switch is provided;
The active-matrix circuit drive method of this organic light emitting diode display comprises:
In discharge cycle input one-period property positive pulse, making this switchgear is conducting state;
Import the input end of this GTG data, and conducting stores this GTG data to the output terminal of this switchgear by this capacity cell to this switchgear;
Import a fixed voltage to this common pole;
When this positive pulse transition was one first negative pressure, making this switchgear was closed condition, and the control end of this switchgear couples this first negative pressure, and the signal transition of this common pole is one second negative pressure;
This perpendicular line signal is imported the input end of this GTG data to this switchgear of this active matrix configuration; And
Import this periodicity positive pulse in a display cycle, this GTG data of this vertical signal input display frame.
2, the active-matrix circuit drive method of organic light emitting diode display according to claim 1, it is characterized in that wherein said horizontal line signal, this perpendicular line signal, and this display cycle of this common pole signal and this discharge cycle time interval are vertical synchronizing signal cycle.
3, the active-matrix circuit drive method of organic light emitting diode display according to claim 1, it is characterized in that wherein providing a common pole signal, being coupled to this common pole, is input one-period property voltage, makes this driving transistors gate couple this first negative pressure at this discharge cycle.
4, the active-matrix circuit drive method of organic light emitting diode display according to claim 1 is characterized in that wherein said shared very one second horizontal signal.
5, the driving method of the active-matrix circuit of organic light emitting diode display according to claim 1, it is characterized in that wherein said horizontal line signal and this perpendicular line signal are this discharge cycles of this vertical synchronizing signal frequency domain partly, produce this horizontal line signal and this perpendicular line signal that shows with this discharge cycle with logical operation.
6, the active-matrix circuit of organic light emitting diode display according to claim 1 driving method, it is characterized in that wherein said perpendicular line signal couples earth potential when this discharge cycle.
7, the driving method of the active-matrix circuit of organic light emitting diode display according to claim 1, it is characterized in that wherein said perpendicular line signal after this common pole of this discharge cycle is imported this cycle positive pulse end, this perpendicular line signal couples a high impedance current potential.
8, the driving method of the active-matrix circuit of organic light emitting diode display according to claim 1, it is characterized in that wherein importing this wide periodicity positive pulse of single horizontal synchronization signal cycle in this display cycle, it is wide to import a plurality of horizontal synchronization signal cycle at this discharge cycle, wherein the overlapping wide periodicity positive pulse of a horizontal synchronization signal cycle of each adjacent those horizontal line.
9, a kind of active-matrix circuit of organic light emitting diode display is characterized in that it comprises:
One first horizontal line is the signal line that is used to control one first switchgear, connects the control end of this first switchgear;
One second horizontal line;
One the 3rd horizontal line is the signal line that is used for one the 3rd gauge tap device, connects the control end of one the 3rd switchgear;
One perpendicular line is to transmit a GTG data, is coupled to the input end of this first switchgear;
One capacity cell is to be used to store this GTG data;
One first switchgear is the turnover of this GTG data of control, and output terminal couples the positive pole of this capacity cell;
One second switch device, wherein an input end connects this capacity cell negative pole, and control end connects this first horizontal line, and output terminal connects this second horizontal line;
One the 3rd switchgear, input end connect this capacity cell negative pole, and control end connects the 3rd horizontal line, and output terminal connects this second horizontal line;
One driving transistors device is to be used to drive this organic light-emitting diode element, and drain couples one and drives high bias voltage, and source electrode couples the anode of this Organic Light Emitting Diode, and gate connects output terminal and this capacity cell positive pole of this first switchgear; And
One organic light-emitting diode element, anode couple the source electrode of this driving transistors device, and negative electrode couples one and drives low bias voltage.
10, the active-matrix circuit of organic light emitting diode display according to claim 9, it is characterized in that wherein said first switchgear, this second switch device, reaching the 3rd switchgear is single amorphous silicon film transistor element.
11, the active-matrix circuit of organic light emitting diode display according to claim 9, the positive pulse that it is characterized in that the wherein said first horizontal signal and this second horizontal signal is not overlapping mutually when this display cycle, overlapping half pulse width when this discharge cycle, and the phase place of the 3rd horizontal signal and this second horizontal signal is anti-phase each other.
12, a kind of active-matrix system of organic light emitting diode display is characterized in that it comprises at least:
One Organic Light Emitting Diode active-matrix comprises a plurality of Organic Light Emitting Diode active members;
At least one data drive unit provides a plurality of perpendicular line signals, to import a plurality of pixel gray level values of those Organic Light Emitting Diode active members;
One sequential control device provides a plurality of sequential control signals and a plurality of controlling signal to this data drive unit at least; And
The one scan drive unit provides a plurality of horizontal line signals to those light emitting diode active member to be arranged, with gated sweep line current potential,
Wherein the positive pulse of those horizontal signals is not overlapping mutually when a display cycle, overlapping half pulse width when this discharge cycle.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2003101152380A CN100399376C (en) | 2003-11-24 | 2003-11-24 | Active matrix system, circuit and drive method therefor of organic light emitting diode display |
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| CNB2003101152380A CN100399376C (en) | 2003-11-24 | 2003-11-24 | Active matrix system, circuit and drive method therefor of organic light emitting diode display |
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| CN100399376C CN100399376C (en) | 2008-07-02 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100363966C (en) * | 2004-07-07 | 2008-01-23 | 友达光电股份有限公司 | Pixel driving circuit for voltage driven active organic luminous display |
| US7847774B2 (en) | 2004-06-30 | 2010-12-07 | Au Optronics Corporation | Active matrix organic light emitting diode (AMOLED) display, a pixel driving circuit, and a driving method thereof |
| CN102004217B (en) * | 2009-09-03 | 2013-03-27 | 联咏科技股份有限公司 | Circuit structure capable of reducing influence of test and testing method thereof |
| TWI570703B (en) * | 2012-05-29 | 2017-02-11 | 三星顯示器有限公司 | Organic light emitting display device and driving method thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000347622A (en) * | 1999-06-07 | 2000-12-15 | Casio Comput Co Ltd | Display device and its driving method |
| JP2003302936A (en) * | 2002-03-29 | 2003-10-24 | Internatl Business Mach Corp <Ibm> | Display device, oled panel, device and method for controlling thin film transistor, and method for controlling oled display |
-
2003
- 2003-11-24 CN CNB2003101152380A patent/CN100399376C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7847774B2 (en) | 2004-06-30 | 2010-12-07 | Au Optronics Corporation | Active matrix organic light emitting diode (AMOLED) display, a pixel driving circuit, and a driving method thereof |
| CN100363966C (en) * | 2004-07-07 | 2008-01-23 | 友达光电股份有限公司 | Pixel driving circuit for voltage driven active organic luminous display |
| CN102004217B (en) * | 2009-09-03 | 2013-03-27 | 联咏科技股份有限公司 | Circuit structure capable of reducing influence of test and testing method thereof |
| TWI570703B (en) * | 2012-05-29 | 2017-02-11 | 三星顯示器有限公司 | Organic light emitting display device and driving method thereof |
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| Publication number | Publication date |
|---|---|
| CN100399376C (en) | 2008-07-02 |
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