CN100543820C - Active matrix organic LED display and driving method thereof - Google Patents

Active matrix organic LED display and driving method thereof Download PDF

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Publication number
CN100543820C
CN100543820C CNB2006100030036A CN200610003003A CN100543820C CN 100543820 C CN100543820 C CN 100543820C CN B2006100030036 A CNB2006100030036 A CN B2006100030036A CN 200610003003 A CN200610003003 A CN 200610003003A CN 100543820 C CN100543820 C CN 100543820C
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circuit
image element
element circuit
image
gtg
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CN1804979A (en
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李易书
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AU Optronics Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

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Abstract

Active matrix organic LED display comprises many data lines, multi-strip scanning line, a plurality of image element circuit, one source pole driving circuit, a gate driver circuit, a time series data control circuit, and an ash stage circuit.This source electrode drive circuit comprises a data line drive circuit, is used for producing the drive current that is relevant to image element circuit desire show image.Current source is used in to the image element circuit pre-charge.Switch is coupled between current source and the image element circuit, is used for electric connection or separate current sources and image element circuit.Ash stage circuit is used for coming gauge tap according to the GTG value of the desire of the image element circuit on one scan line show image.The time series data control circuit is used for controlling source electrode drive circuit and gate driver circuit.

Description

Active matrix organic LED display and driving method thereof
Technical field
The present invention relates to an active matrix organic LED display and driving method thereof, refer to a kind of can the driving and the active matrix organic LED display and the driving method thereof of precharge pixel especially by current source.
Background technology
Flat-panel screens (flat panel display) has advantages such as power saving, radiationless and volume be little, has therefore replaced conventional cathode ray tube (cathode ray tube, CRT) display gradually.Along with the plane display technique is flourish, global panel vendor is devoted to develop various emerging flat-panel screens technology invariably, to promote the market competitiveness.Wherein, use Organic Light Emitting Diode (organic light emittingdiode, OLED) but organic light emitting display has advantages such as fast, wide viewing angle of autoluminescence, high brightness, high-luminous-efficiency, high contrast, reaction time, low power consumption and serviceability temperature scope are big, and is therefore highly competititve on the market of flat-panel screens.
Organic Light Emitting Diode this as a current drives assembly, its luminosity is to decide according to the size of electric current of flowing through, the size by control Organic Light Emitting Diode drive current can reach the effect that shows different brightness (being called the GTG value again).According to the difference of type of drive, the matrix form display can be divided into two kinds of passive matrix (passive matrix) display and active-matrix (active matrix) displays.The passive matrix display is to adopt the mode of driven sweep line in proper order, drive the pixel that is positioned on different lines/row (sweep trace/data line) one by one, therefore the fluorescent lifetime of the pixel on each row/row can be subject to the sweep frequency and the number of scanning lines of display, is not suitable for big picture and high-resolution display.Active matrix display device then forms independently image element circuit in each pixel, each image element circuit comprises a storage capacitors, one Organic Light Emitting Diode luminescence component, and two thin film transistor (TFT) (thin-film transistor, TFT), regulate the size of the drive current of Organic Light Emitting Diode luminescence component to utilize image element circuit, even therefore under big picture and high-resolution requirement, still can continue to provide each pixel one stabilized driving electric current, improve the brightness uniformity of display.
Please refer to Fig. 1, Fig. 1 is the synoptic diagram of an active matrix organic light-emitting display panel 10 in the prior art.Organic electroluminescence display panel 10 comprises a data line DL, one scan line GL, and an image element circuit 100.Image element circuit 100 comprises an Organic Light Emitting Diode 110, a storage capacitors 120, thin film transistor (TFT) 130 and 140, and voltage source Vcc and Vss.The gate coupled of thin film transistor (TFT) 130 is in sweep trace GL, and its drain coupled is in data line DL.The gate coupled of thin film transistor (TFT) 140 is in the source electrode of thin film transistor (TFT) 130, and its drain coupled is in voltage source Vcc.Storage capacitors 120 is coupled between the source electrode and earthing potential of thin film transistor (TFT) 130, and Organic Light Emitting Diode 110 is coupled between the source electrode and voltage source V ss of thin film transistor (TFT) 140.When image element circuit 10 is desired show image, at first transmit signal to open (making its conducting) thin film transistor (TFT) 130 by sweep trace GL, this moment, storage capacitors 120 can be coupled to data line DL by thin film transistor (TFT) 130, and the electric current that data line DL transmits can deposit storage capacitors 120 in opening thin film transistor (TFT) 140 required grid voltages to storage capacitors 120 chargings.After thin film transistor (TFT) 140 is unlocked, an electric current I OLEDThe Organic Light Emitting Diode 110 of can flowing through, the brightness that Organic Light Emitting Diode 110 shows then is relevant to I OLEDSize.Electric current I OLEDCan represent by following formula:
L OLED = 1 2 μ · C OX · W L · ( V GS - V TH ) 2
Wherein, μ represents electron mobility, and Cox represents the gate capacitance (gate oxidecapacitance per unit area) of thin film transistor (TFT) 140 unit areas, and W represents the channel width of thin film transistor (TFT) 140, and L represents the channel length of thin film transistor (TFT) 140, V THRepresent the critical voltage (thresholdvoltage) of thin film transistor (TFT) 140, and V GSRepresent the grid of thin film transistor (TFT) 140 and the pressure reduction between the source electrode.The GTG value of Organic Light Emitting Diode 110 show images is according to electric current I OLEDSize decide, and be relevant to the V of electric current I OLED size CSThen depend on the electric charge that is stored in the storage capacitors 120.When Organic Light Emitting Diode 110 shows low grey-tone image being lower than a GTG reference value, drive the required electric current I of image element circuit 100 OLEDMinimum, as to need V GSAlso very little, this moment is also very low by the current value that data line reaches storage capacitors 120.Under the situation of low current, often can't effectively storage capacitors 120 be filled full so that required V to be provided GSPressure reduction influences image element circuit 100 in the performance that shows grey-tone image.Therefore, when active matrix organic light-emitting display panel of the prior art hangs down grey-tone image in demonstration, have the not good situation of image quality.
Summary of the invention
The invention provides a kind of driving method of active matrix organic LED display, it comprises judges on the display panel that an image element circuit on the one scan line desires the GTG value of show image and whether be lower than a GTG reference value; Be lower than the GTG reference value if image element circuit is desired the GTG value of show image, and the image element circuit number that the GTG value of desire show image is lower than the GTG reference value on the sweep trace is then imported a pre-charge current to image element circuit greater than a critical value; And in the input pre-charge current to image element circuit, input with respect to the signal of show image to image element circuit.
The present invention provides a kind of active matrix organic LED display in addition, and it comprises: many data lines are used for communicated data signal; The multi-strip scanning line is used for transfer control signal; A plurality of image element circuits, each image element circuit are to be coupled to corresponding data line and sweep trace; The one source pole driving circuit, it comprises a data line drive circuit, is used for producing the drive current that is relevant to image element circuit desire show image; One current source is used for before the drive current that a data line Data transmission line drive circuit is produced to the data line pre-charge; And a switch, be coupled between current source and the data line, be used for setting up or cutting off the electric connection of current source and data line; One time series data control circuit is used for controlling source electrode drive circuit and gate driver circuit according to video and time series data; And an ash stage circuit, be used for controlling the switch of source electrode drive circuit according to the GTG value that the image element circuit on the data line is desired show image.
The invention has the beneficial effects as follows: the present invention can improve active matrix organic light-emitting display panel of the prior art when showing grey-tone image, because of causing, undercharge shows the not good situation of image quality, and can under the situation of the I/O that does not influence normal images, improve display quality.
Description of drawings
Fig. 1 is the image element circuit synoptic diagram of an active matrix organic light-emitting display panel in the prior art.
Fig. 2 is the synoptic diagram of an active matrix organic light-emitting display panel among the present invention.
Fig. 3 is the synoptic diagram of a data line drive circuit among the present invention.
Fig. 4 is the synoptic diagram of an ash stage circuit among the present invention.
Fig. 5 is the process flow diagram of the ash stage circuit of Fig. 4 in running.
Fig. 6 is the sequential chart of active matrix organic light-emitting display panel when running of Fig. 2.
22 source electrode drivers, 24 grid drivers
26 control circuits, 28 time series data control circuits
30 ash stage circuit, 31 data line drive circuits
32 shift cache circuits, 33 data latching device circuit
34 digital/analog converters, 35 output buffers
36 voltage I PreThe pre-charge current source
110, OLED Organic Light Emitting Diode
120, Cs storage capacitors
The 500-570 step
40,60,80 decision circuitry
Vcc, Vss voltage source
SW r, SW g, SW bSwitch
47,67,87 line buffers
48,68,88 grey exponent counters
49,69,89 switch counters
50,70,90 JK flip-flops
41-43,61-63,81-83 storage unit
44-46,64-66,84-86 comparer
DL, DL r, DL g, DL bData line
GL, GL 1-GL nSweep trace
130,140, TFT1, TFT2 thin film transistor (TFT)
100, Pr 1, Pr 2, Pr n, Pg 1, Pb 1Image element circuit
10,20 active matrix organic light-emitting display panels
Embodiment
Please join Fig. 2, Fig. 2 is the synoptic diagram of an active matrix organic light-emitting display panel 20 among the present invention.Organic electroluminescence display panel 20 comprises data line DL r, DL g, DL b, sweep trace GL 1-GL n, image element circuit Pr 1-Pr n, Pg 1-Pg n, Pb 1-Pb n, source electrode driver (source driver) 22, gate drivers (gate driver) 24, and a control circuit 26.Each image element circuit comprises an Organic Light Emitting Diode OLED, a storage capacitors Cs, thin film transistor (TFT) TFT1 and TFT2, and voltage source Vcc and Vss.The gate coupled of the thin film transistor (TFT) TFT1 of each image element circuit is in corresponding sweep trace, and its drain coupled is in corresponding data line DL.The gate coupled of the thin film transistor (TFT) TFT2 of each image element circuit is in the source electrode of corresponding thin film transistor (TFT) TFT1, and its drain coupled is in voltage source Vcc.The storage capacitors Cs of each image element circuit is coupled between the source electrode and earthing potential of corresponding thin film transistor (TFT) TFT1, and Organic Light Emitting Diode OLED is coupled between the source electrode and voltage source V ss of corresponding thin film transistor (TFT) TFT2.
Control circuit 26 is coupled to source electrode driver 22 and gate drivers 24, and comprises a time series data control circuit 28 and an ash stage circuit 30.Time series data control circuit 28 receives the clock signal V of active matrix organic light-emitting display panel 20 image that desire shows in a frame period (frame period) GateWith data-signal V Source, and according to clock signal V GateWith data-signal V SourceGeneration controls signal to gate drivers 24 and source electrode driver 22, makes that active matrix organic light-emitting display panel 20 can correct show image.The GTG value that ash stage circuit 30 is used for desiring in a frame period according to active matrix organic light-emitting display panel 20 show image produces switch controlling signal V r, V g, V bThe function mode of time series data control circuit 28 and ash stage circuit 30 after can further describe in detail.
Source electrode driver 22 comprises a data line drive circuit 31, a pre-charge current source I Pre, and switch SW r, SW g, SW bPlease refer to Fig. 3, Fig. 3 is the enlarged diagram of data line drive circuit 31 among the present invention.Data line drive circuit 31 comprises a shift cache circuit (shift register) 32, one data latching device circuit (latch circuit) 33, one digital/analog converter (digital to analog converter, DAC) 34, one output buffer (output buffer) 35, an and voltage 36.The numerical data of the desire show image that shift cache circuit 32 will be sent here from time series data control circuit 28 is kept in and is carried out shifting processing, should deposit to data latching device circuit 33 by a plurality of digital image datas after the digital image data of finishing the whole piece scanning linear receives again.Digital analog converter 34 receives the digital voltage signal of being exported by data latching device circuit 33, and digital voltage signal is converted to an analog voltage signal.Output buffer 35 is used for the stable simulation voltage signal, and exports the analog voltage signal that receives to voltage-current converter circuit 36 to produce the drive current I corresponding to the data of desiring show image r, I g, I b
Under normal circumstances, the clock signal V that transmits according to control circuit 26 of active matrix organic light-emitting display panel 20 Gate, by being coupled to sweep trace GL 1-GL nGate drivers 24 on-pixel circuit in thin film transistor (TFT) TFT1, and corresponding to the data-signal V that desires show image SourceDrive current I r, I g, I bThen reach storage capacitors Cs in the corresponding image element circuit by data line, be recharged the pressure reduction that produced of back by storage capacitors Cs and come thin film transistor (TFT) TFT2 in the on-pixel circuit, and the flow through size of current of corresponding Organic Light Emitting Diode OLED of control, make image element circuit can reach the display effect of different GTGs.
Yet when an image element circuit showed low grey-tone image being lower than a GTG reference value, the required charging current of its storage capacitors Cs was very little, is not easy in the running time storage capacitors Cs to be charged to required magnitude of voltage.At this moment, active matrix organic light-emitting display panel 20 of the present invention can show the image element circuit charging of low GTG value image by pre-charge current source Ipre earlier to desire.Suppose that active matrix organic light-emitting display panel 20 judgements (can further describe in detail after the judgment mode of the present invention) must be to image element circuit Pr 1Precharge is at first by gate drivers 24 on-pixel circuit Pr 1Thin film transistor (TFT) TFT1, produce switch controlling signal V by ash stage circuit 30 again rTo open (making short circuit) switch SW r, image element circuit Pr like this 1Can be electrically connected to pre-charge current source I Pre, and pre-charge current source I PreCan be earlier to image element circuit Pr 1Storage capacitors Cs precharge, the data line drive circuit 31 of last source electrode driver 22 produces and corresponds to image element circuit Pr 1Desire the drive current I of show image rThen can pass through data line DL rReach image element circuit Pr 1Storage capacitors Cs.So, even drive current I rValue very little because image element circuit Pr 1Storage capacitors Cs by pre-charge current source I PreBe precharged to certain level, image element circuit Pr 1Storage capacitors Cs can in the running time, be charged to required magnitude of voltage easily, can effectively improve image element circuit Pr 1Image quality when grey-tone image is hanged down in demonstration.
Please refer to Fig. 4, Fig. 4 is the synoptic diagram of ash stage circuit 30 among the present invention, and Fig. 4 illustrates further active matrix organic light-emitting display panel 20 and carries out precharge method.Ash stage circuit 30 comprises decision circuitry 40,60,80.Decision circuitry 40,60,80 is desired image data displaying signal V according to active matrix organic light-emitting display panel 20 in a frame period Source, judging whether needs to carry out precharge, produces switch controlling signal V according to judged result again r, V g, V bDecision circuitry 40 comprises storage unit 41,42,43, comparer 44,45,46, one line buffers (line buffer) 47, one grey exponent counter 48, one switch counters 49, and a JK flip-flop (JK flip flop) 50; Decision circuitry 60 comprises storage unit 61,62,63, comparer 64,65,66, one line buffers 67, one grey exponent counter 68, one switch counters 69, and a JK flip-flop 70; Decision circuitry 80 comprises storage unit 81,82,83, comparer 84,85,86, one line buffers 87, one grey exponent counter 88, one switch counters 89, and a JK flip-flop 90.There are a R GTG reference value, a G GTG reference value and a B GTG reference value in the storage unit 41,61 and 81 respectively; There are a R grey scale critical value, a G grey scale critical value and a B grey scale critical value in the storage unit 42,62 and 82 respectively; There are a R switch reference value, a G switch reference value and a B switch reference value in the storage unit 43,63 and 83 respectively.GTG reference value and grey scale critical value can be made as different value on demand, and when the GTG value of image element circuit desire show image was lower than the GTG reference value, the image that this image element circuit desire shows was defined as low grey-tone image; When the one scan line shows that the image element circuit of low grey-tone image outnumbers grey scale critical value, represent the image element circuit that needs this moment this sweep trace to carry out precharge; The switch reference value is then carried out the time of desire charging to the image element circuit of this sweep trace corresponding to need.
Please refer to Fig. 5, the running of ash stage circuit 30 among flowchart text the present invention of Fig. 5, it comprises the following step:
Step 500: the data-signal that will be relevant to all image element circuits desire show images of one scan line deposits line buffer in;
Step 510: whether the GTG value of data-signal of judging an image element circuit is less than a GTG reference value; If the GTG value of the data-signal of image element circuit is less than the GTG reference value, execution in step 520; If the GTG value of the data-signal of image element circuit is not less than the GTG reference value, execution in step 530;
Step 520: the GTG count value that increases by a grey exponent counter;
Step 530: judge that whether the GTG count value is greater than a grey scale critical value; If the GTG count value is greater than grey scale critical value, execution in step 540; If the GTG count value is not more than grey scale critical value, execution in step 570;
Step 540: produce a switch controlling signal, and increase the switch count value of a switch counter;
Step 550: judge that whether the switch count value is less than a switch reference value; If the switch count value is less than a switch reference value, execution in step 560; If this switch count value is not less than the switch reference value, execution in step 570;
Step 560: export this switch controlling signal; And
Step 570: finish.
With sweep trace GL 1Be example, in step 500, the control circuit 26 of active matrix organic light-emitting display panel 20 is at first according to sweep trace GL 1Desire the data-signal of show image, the R data-signal that is relevant to red image is stored to line buffer 47, the G data-signal that is relevant to green image is stored to line buffer 67, and the B data-signal that will be relevant to blue image is stored among the line buffer 87.In step 510, ash stage circuit 30 is judged the magnitude relationship that is stored in the R data-signal in the line buffer 47 and is stored in the R GTG reference value in the storage unit 41, judge the magnitude relationship that is stored in the G data-signal in the line buffer 67 and is stored in the G GTG reference value in the storage unit 61, and judge the magnitude relationship that is stored in the B data-signal in the line buffer 87 and is stored in the B GTG reference value in the storage unit 81.With sweep trace GL 1The R data-signal be example, as sweep trace GL 1The R data-signal less than the R GTG reference value that is stored in the storage unit 41, the decision circuitry of ash stage circuit 30 40 can increase the GTG count value of grey exponent counter 48, then execution in step 530 in step 520; If sweep trace GL 1The R data-signal be not less than R GTG reference value, decision circuitry 40 direct execution in step 530.In step 530, decision circuitry 40 can judge that whether the GTG count value of grey exponent counter 48 is greater than a R grey scale critical value that is stored in the storage unit 42; If the GTG count value greater than the R grey scale critical value, is represented sweep trace GL 1Desire shows that the number of the image element circuit that hangs down the red image of GTG is more than enough, and this moment, decision circuitry 40 meeting execution in step 540 were to produce a switch controlling signal V r, and the switch count value of increase switch counter 49; If the GTG count value is not more than the R grey scale critical value, 40 of decision circuitry can execution in step 570.At last in step 550, if the switch count value of switch counter 49 is less than a R switch reference value that is stored in the storage unit 43, decision circuitry 40 can be in step 560 output switch control signal V rTo open the switch SW of source electrode driver 22 r, this moment current source I PreCan be electrically connected to data line DL r, current source I like this PrePre-charging data line DL can be provided rRequired electric current.
In like manner, when the decision circuitry 60 and 80 of ash stage circuit 30 also respectively at sweep trace GL 1G data-signal and B data-signal carry out abovementioned steps: as sweep trace GL 1The G data-signal less than the G GTG reference value that is stored in the storage unit 61, the GTG count value of ash exponent counter 68 is greater than a G grey scale critical value that is stored in the storage unit 62, and the switch count value of switch counter 69 less than one be stored in the storage unit 63 G switch reference value the time, decision circuitry 60 can be in step 560 output switch control signal V gTo open the switch SW of source electrode driver 22 g, this moment pre-charge current source I PreCan be electrically connected to data line DL g, pre-charge current source I like this PrePre-charging data line DL can be provided gRequired electric current; As sweep trace GL 1The B data-signal less than the B GTG reference value that is stored in the storage unit 81, the GTG count value of ash exponent counter 88 is greater than a B grey scale critical value that is stored in the storage unit 82, and the switch count value of switch counter 89 less than one be stored in the storage unit 83 B switch reference value the time, decision circuitry 80 can be in step 560 output switch control signal V bTo open the switch SW of source electrode driver 22 b, this moment pre-charge current source I PreCan be electrically connected to data line DL b, pre-charge current source I like this PrePre-charging data line DL can be provided bRequired electric current.
Therefore, the present invention can improve the active matrix organic light-emitting display panel of prior art when showing grey-tone image, can show the not good situation of image quality because of undercharge causes.
Please refer to Fig. 6, Fig. 6 is the sequential chart of active matrix organic light-emitting display panel 20 when running.In Fig. 6, waveform D InRepresentative inputs to the image input signal of one scan line, waveform D OutRepresent the output image signal of this sweep trace.As waveform D InDuring the tool noble potential, represent and image data is being inputed to data line DL this moment 1-DL rAnd as waveform D OutDuring the tool noble potential, represent data line DL this moment 1-DL rIn the image output data.Between the I/O of image, comprise and hide from view (blanking) period Tb 1-Tb m, promptly hiding from view in the period in the running of ash stage circuit 30 shown in the process flow diagram of Fig. 5 and to carry out.Therefore, driving method of the present invention can not influence the I/O of normal images, and can improve display quality.
Above-mentioned embodiment only is used to illustrate the present invention, and non-limiting the present invention.

Claims (3)

1. the driving method of an active matrix organic LED display is characterized in that, comprises the following step:
(a) judge on the display panel that an image element circuit on the one scan line desires the GTG value of show image and whether be lower than a GTG reference value;
(b) be lower than the GTG reference value if image element circuit is desired the GTG value of show image, and the image element circuit number that the GTG value of desire show image is lower than the GTG reference value on the sweep trace is then imported a pre-charge current to image element circuit greater than a critical value; And
(c) in the input pre-charge current to image element circuit, input with respect to the signal of show image to image element circuit.
2. driving method as claimed in claim 1 is characterized in that other comprises:
Calculate in a picture, calculate the number of times of sweep trace desire charging.
3. driving method as claimed in claim 1 is characterized in that, imports a pre-charge current to image element circuit to be: couple the current source of image element circuit and one source pole driving circuit, to import a pre-charge current to image element circuit.
CNB2006100030036A 2006-01-24 2006-01-24 Active matrix organic LED display and driving method thereof Active CN100543820C (en)

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KR100912093B1 (en) * 2007-05-18 2009-08-13 삼성전자주식회사 PTAT current generation circuit having high temperature coefficient, display device and method thereof
CN101754517B (en) * 2008-11-28 2013-03-27 盛群半导体股份有限公司 Control drive device of luminous diode
CN103596344B (en) * 2013-12-02 2017-01-04 广东威创视讯科技股份有限公司 A kind of LED drive system and method
TWI633531B (en) * 2017-10-13 2018-08-21 點晶科技股份有限公司 Light emitting diode driving circuit and light emitting diode display device
CN110827748B (en) * 2019-11-08 2020-12-25 四川遂宁市利普芯微电子有限公司 Pre-charging circuit of LED display screen driving chip
TWI768631B (en) * 2020-01-10 2022-06-21 瑞鼎科技股份有限公司 Micro-led display system
CN113889046B (en) * 2020-07-02 2022-12-09 京东方科技集团股份有限公司 Display panel, driving method thereof and display device

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