CN102768821B - AMOLED (active matrix/organic light emitting diode) display and driving method of AMOLED display - Google Patents
AMOLED (active matrix/organic light emitting diode) display and driving method of AMOLED display Download PDFInfo
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Abstract
The invention relates to an AMOLED (active matrix/organic light emitting diode) display and a driving method of the AMOLED display. The AMOLED display is provided with a compensation unit as well as a row driver and a column driver which are connected with a pixel array, wherein the compensation unit is provided with an overlaying device connected with a time sequence controller, the time sequence controller is also connected with the row driver, and the overlaying device is connected with a memory, an A/D (Analog to Digital) converter, a I/V converter and the column driver; each pixel unit of the pixel array comprises a first switch conducting element and a second switch conducting element, wherein the data conducting pins of the first switch conducting element are connected with the control pins of the column driver and a drive conducting element respectively; a capacitor is arranged between the input pin and the control pin of the drive conducting element; the input pins and the output pins of the second switch conducting element are connected with the output pins of the drive conducting element, the I/V converter and the A/D converter respectively. According to the AMOLED display and the driving method, a plurality of factors causing the image quality degradation can be compensated, the image display quality of the AMOLED display is improved, and the AMOLED display is simple in circuit structure.
Description
Technical field
The present invention relates to display and the driving method to described display, is displayer and driving method thereof concretely.
Background technology
In flat panel display, organic light emitting diode display (OLED) is frivolous with it, the many merits such as active illuminating, fast-response speed, wide viewing angle, rich color and high brightness, low-power consumption, high-low temperature resistant and to be known as by industry be third generation display technique after liquid crystal display (LCD).By type of drive, OLED is divided into passive type OLED(PMOLED, also referred to as passive matrix OLED) and active OLED(AMOLED, also referred to as Activematric OLED).Wherein AMOLED is driven by the method for capacitor ME for maintenance by integrated thin-film transistor (TFT) in each pixel and capacitor.AMOLED can realize large scale, resolution panels, is the emphasis of current research and the developing direction of following display technique, but the driving method that very difficult realization technically controls deterioration in image quality, and need higher cost.
Because the threshold voltage and electron mobility thereof that control the driving transistors of each pixel light emission of displayer exist heterogeneity, and threshold voltage also will drift about along with the change of time, make under identical data-signal, the electric current generation deviation flowing through OLED causes display brightness inequality (MURA); The luminescence efficiency of Organic Light Emitting Diode (OLED) self also can be degenerated along with the time, luminosity under identical electric current is reduced and causes image retention; Driving transistors due to leakage current causes displayer can not the image of the low gray scale of real-playback; The power line impedance of driving transistors also causes the brightness of Organic Light Emitting Diode to reduce to the decay of voltage.All of these factors taken together is all the major reason causing displayer deterioration in image quality.Though also research and propose driving compensation method for above-mentioned partly cause in industry, but a kind of method generally only can compensate the deterioration in image quality that wherein a certain or several factor causes, and thin film transistor (TFT) (TFT) quantity of pixel-driving circuit needed for these methods is more, a kind of can compensation in current known technology, is not still had above-mentionedly allly to cause the factor of deterioration in image quality and the less method of required image element circuit TFT.
Summary of the invention
For above-mentioned problem, the invention provides a kind of displayer and driving method thereof, the above-mentioned multiple factor of deterioration in image quality that causes is compensated, improve the picture quality of displayer, and circuit structure is simple.To the compensation of data namely can be real-time compensate, also can user setting time compensate.
Displayer of the present invention, there is the line driver and row driver that connect pel array, also there is compensating unit, the time schedule controller receiving input signal is provided with in compensating unit, described time schedule controller is connected with described row driver by superimposer, and time schedule controller is also connected with line driver simultaneously; The input end of described superimposer has also been linked in sequence storer, A/D converter and I/V converter.Line driver and row driver same as the prior art, do not describe in detail at this, I/V converter is for receiving the detection electric current of pixel cell and being converted into voltage, and A/D converter is used for analog voltage to be converted to digital voltage to store in memory;
Pel array is made up of pixel cell, each pixel cell comprises the first switch conduction element and second switch breakover element, and driving breakover element, two the data conducting pin data line of connecting column driver and control pin of driving breakover element respectively of the first switch conduction element; Drive the power supply input pin of breakover element and drive between the control pin of breakover element and be connected with capacitor; The sweep trace of the control pin of the first switch conduction element and second switch breakover element connected row driver simultaneously; The input pin of second switch breakover element is connected to the 3rd node with driving the output pin of breakover element, and the output pin of second switch breakover element is connected to I/V converter and the A/D converter of compensating unit by detection line; The positive pole of OLED is connected with the 3rd node.By driving luminance non-uniformity caused by the heterogeneity of breakover element threshold voltage and the deviation of electron mobility and threshold voltage drift in time and deviation in compensation pixel unit, thus improve picture quality.Described breakover element can be transistor or triode, also can be that other has element, the circuit structure of similar functions.
On above-mentioned basis, the output terminal of the time schedule controller of compensating unit is also connected with light emission controller; Also there is in described pixel cell the 3rd switch conduction element, the control pin of the 3rd switch conduction element is connected with described light emission controller by light emitting control line, receive the control signal of light emission controller, the positive pole of described OLED is connected with the 3rd node with input pin by the output pin of the 3rd switch conduction element.The pixel unit circuit the most basic relative to displayer, second switch breakover element and the 3rd switch conduction element is merely add in the pixel cell of inventive display, and detection line and light emitting control line, therefore the present invention realization compensate multiple cause deterioration in image quality factor while, pixel unit circuit only have employed the least possible element and control linkage relation is simple, is conducive to producing implementing.By calculating OLED degree of degeneration and compensating, and then the phenomenon such as the brightness irregularities (MURA) of elimination displayer and image retention is to obtain the image of high-quality.
Preferably, described storer is (LUT:Look-Up-Table) storer with display look-up table.LUT is a RAM(random access memory in essence), after it writes RAM in advance data, table look-up whenever input signal just equals input address, find out the content that address is corresponding, then export.Here LUT can be understood as is the mapping table of a compensation pixel gray-scale value, the curtage corresponding with grey scale pixel value that actual samples arrives by it is through certain conversion (as threshold value, reversion, binaryzation, setting contrast, linear transformation etc.), become the grey level compensation value that another one is corresponding with it, the useful information of outstanding image can be played like this, the effect of the optical contrast ratio of correcting image.
Preferably, described each breakover element is transistor.
Present invention also offers the driving method for described displayer: the time schedule controller of compensating unit receives the input signal comprising viewdata signal, time schedule controller control lines driver exports line scan signals and carries out addressing line by line to the pixel cell of pel array, described viewdata signal carries out correction process through superimposer, the image compensation data stored in viewdata signal and storer is carried out sum operation and obtains view data superposed signal by superimposer, described view data superposed signal is after row driver inputs from the data input pin of pixel cell, the OLED of pixel cell sends corresponding brightness according to the size of the view data superposed signal of input.Because the image compensation data stored in storer calculates the monitoring of the decay of supply voltage etc. the threshold voltage of the driving breakover element of pixel cell, mobility and power line impedance according to detection line, therefore after superposition compensates, OLED just can send the light of the object brightness corresponding with original viewdata signal, thus obtains the image of high-quality.
Preferably, the output terminal of the time schedule controller of compensating unit is connected with light emission controller; Have the 3rd switch conduction element in described pixel cell, control signal is delivered in pixel cell by the control pin of the 3rd switch conduction element by light emission controller; The positive pole of OLED is connected with the 3rd node with input pin by the output pin of the 3rd switch conduction element;
When light emission controller detects that the viewdata signal of input corresponds to minimum gray scale, export the control signal of the 3rd switch conduction element turning off pixel cell, make the pitch black image of OLED real-playback, and the low light level can not be sent because of weak current.
Concrete, described driving method is divided into the first detection period, the second detection period, amortization period and light emission period;
First detection period is used for detecting and calculates the pressure drop of the threshold voltage of driving breakover element (T2), electron mobility, power lead equiva lent impedance: by compensating unit and line driver by the first switch conduction element (T1) and second switch breakover element (T4) conducting, the 3rd switch conduction element (T3) ends; Detect respectively make OLED just luminous, when sending arbitrary intermediate luminance light and send high-high brightness light, drive the electric current of breakover element (T2), this electric current stores after feeding back to I/V converter by detection line (Det) after A/D converter; According to the detection electric current stored, calculate and the pressure drop of the threshold voltage of storing driver breakover element (T2), electron mobility and power lead equiva lent impedance;
Second detection period is for detecting the degree of degeneration of OLED and calculating the compensation rate of needs to the view data of input: by the 3rd switch conduction element (T3) conducting, store the anode voltage value of the reflection OLED degree of degeneration feeding back to A/D converter through the first switch conduction element (T1) and second switch breakover element (T4); According to the pressure drop of the threshold voltage of driving breakover element (T2) stored, electron mobility, power lead equiva lent impedance and the voltage of reflection OLED degree of degeneration, calculate and store the compensation rate of needs to the view data inputted;
In amortization period, first switch conduction element and the conducting of second switch breakover element, the 3rd switch conduction element cut-off, makes OLED not luminous, compensating unit to the viewdata signal of pixel cell input after compensator corrects, and is charged to capacitor by the first switch conduction element of conducting;
In light emission period, the first switch conduction element and the cut-off of second switch breakover element, the 3rd switch conduction element conductive, drive breakover element to flow through the electric current corresponding with the data voltage that capacitor stores, OLED carries out luminescence.
Can perform the steps such as compensate for brightness inequality (MURA), image retention before displayer shows image, but corresponding step order can be not limited to above-mentioned statement order.
In order to make OLED not by the impact of weak current, concrete step is: when the light emission controller of compensating unit detects that the viewdata signal of input is minimum gray scale (i.e. black level), in the described amortization period, input the view data after overcorrect, driving breakover element is ended; In described light emission period, light emission controller makes the 3rd switch conduction element cut-off by light emitting control line, thus cut-out makes OLED send the electric current of the driving breakover element of faint half-light.
In the method for the invention, preferred each breakover element is transistor.Data in described storer store with the form showing look-up table (LUT).
Test is learnt, displayer of the present invention and driving method circuit structure simple, be conducive to producing and implement, and can compensate the luminance non-uniformity caused by the deviation of the heterogeneity of displayer threshold voltage and electron mobility and threshold voltage shift and deviation, significantly improve picture quality, simultaneously can also compensate the OLED deterioration in image quality that the decay to voltage causes because of weak current and power line impedance, OLED self can also be compensated and to degenerate the display lighting brightness decline caused.
Below in conjunction with the embodiment of accompanying drawing illustrated embodiment, foregoing of the present invention is described in further detail again.But this should be interpreted as that the scope of the above-mentioned theme of the present invention is only limitted to following example.Without departing from the idea case in the present invention described above, the various replacement made according to ordinary skill knowledge and customary means or change, all should comprise within the scope of the invention.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of displayer of the present invention.
Fig. 2 is the circuit diagram of a pixel cell in the pel array of Fig. 1.
Fig. 3 is the drive waveforms of the pixel cell of displayer driving method of the present invention.
Fig. 4 is the drive waveforms of displayer of the present invention when showing minimum gray scale.
Embodiment
Displayer of the present invention as shown in Figure 1, there is the line driver and row driver that connect pel array, also there is compensating unit, the time schedule controller receiving viewdata signal Data1 and clock signal C lock thereof, synchronizing signal Hs/Vs is provided with in compensating unit, described time schedule controller is connected with described row driver by superimposer, and time schedule controller is also connected with line driver and light emission controller simultaneously; The input end of described superimposer is also linked in sequence storer, A/D converter and the I/V converter with display look-up table (LUT).The I/V converter of compensating unit is for receiving the detection electric current of pixel cell and being converted into voltage, and A/D converter is used for analog voltage being converted to digital voltage to store in memory.
As shown in Figure 2, pel array is made up of pixel cell, and each pixel cell, compared with traditional structure, merely add the 3rd switch conduction elements T 3, second switch breakover element T4 and detection line Det, the light emitting control line EM that are PMOS transistor structure.Pixel unit circuit have employed the least possible element, and control linkage relation is simple, is conducive to producing implementing.Source electrode and the drain electrode data line of connecting column driver and the grid of driving breakover element T2 respectively of the first switch conduction elements T 1 of PMOS transistor structure is in pixel cell; The source electrode of breakover element T2 is driven to be connected with power vd D (equiva lent impedance that in Fig. 2, Rs represents power lead).Capacitor Cs is connected with between the control pin driving the source electrode of breakover element T2 and driving breakover element T2; The sweep trace of the grid of the first switch conduction elements T 1 and second switch breakover element T4 connected row driver simultaneously, receives line scan signals Scan; The source electrode of second switch breakover element T4 is connected to the 3rd node N3 with driving the drain electrode of breakover element T2, and the drain electrode of second switch breakover element T4 is connected to I/V converter and the A/D converter of compensating unit by detection line Det; The positive pole of OLED is connected with the 3rd node N3.
The grid being all the 3rd switch conduction elements T 3 of PMOS transistor structure in pixel cell is connected with described light emission controller by light emitting control line EM, receive the control signal of light emission controller, the positive pole of described OLED is connected with the 3rd node N3 with source electrode by the drain electrode of the 3rd switch conduction elements T 3.
The groundwork process of displayer shown in Fig. 1 is, viewdata signal Data1, clock signal C lock and synchronizing signal Hs/Vs send in the time schedule controller of compensating unit, and time schedule controller control lines driver exports line scan signals Scan and carries out addressing line by line to the pixel cell of pel array.The view data superposed signal Data2 corresponding with sweep signal Scan sequential inputs the data line Data of pixel cell through row driver, and the size of the signal that the OLED of pixel cell inputs according to data line Data sends corresponding light.
Specifically, input by row driver the view data superposed signal Data2 of pixel cell to have passed through superimposer correction process at compensating unit, the image compensation data stored in the display look-up table LUT of viewdata signal Data1 original for input displayer and storer is carried out sum operation and obtains Data2 by superimposer.Because the image compensation data stored in look-up table is according to the threshold voltage of detection line Det to the driving breakover element T2 of pixel cell PMOS, mobility and power line impedance are to the decay of supply voltage, the monitoring of the degree of degeneration of OLED etc. also calculates, therefore after superposition compensates, OLED just can send the light of the object brightness corresponding with original viewdata signal Data1, and and threshold voltage, mobility, power line impedance has had nothing to do to the decay of supply voltage and OLED degree of degeneration, and then the phenomenon such as brightness irregularities (MURA) and image retention eliminating displayer is to obtain the image of high-quality.
Further, the light emission controller of compensating unit is when viewdata signal Data1 corresponding minimum gray scale (i.e. the black level) of input being detected, export control signal by light emitting control line EM and turn off the 3rd switch conduction elements T 3 of pixel cell, thus eliminate OLED can not the problem of the pitch black image of real-playback because of the leakage current of the driving breakover element T2 of PMOS structure.
Drive waveforms figure as shown in Figure 3, whole driving method is divided into the first detection period P1, the second detection period P2, amortization period P3 and light emission period P4.
First detection period P1 is for detecting and calculating the threshold voltage driving breakover element T2, electron mobility, the pressure drop of power lead equiva lent impedance: in t1 ~ t4 time period of Fig. 3, be the first detection period P1, wherein in t1 ~ t2 time period, line driver is to the sweep trace Scan output low level of the pixel cell of certain row, first switch conduction elements T 1 of PMOS structure and second switch breakover element T4 conducting, the data-signal Data2 that row driver exports is input to the first switch conduction elements T 1 through the data line Data of pixel cell, and be delivered to node N1 and preserved by electric capacity Cs, in this period, the light emitting control line EM input high level of pixel cell, the 3rd switch conduction elements T 3 is ended, and OLED is not luminous because not having electric current to flow through, drive breakover element T2 source, drain electrode electric current through the second switch breakover element T4 of conducting by the I/V converter of detection line Det feed back input compensator, this electric current is converted to voltage by I/V converter, then send into A/D converter be converted to digital voltage signal further and send into storer preservation, for computed image offset data.Voltage difference between node N1 and node N2 determines the electric current I flowing through and drive breakover element T2 source, drain electrode
dsize (namely flowing to the size of current of node N3 from node N2), computing formula is as follows:
I
D=ημ(V
data－V
N2－Vth)
2（1）
Wherein η is the parameter determined by the channel dimensions and gate insulator layer capacitance that drive breakover element T2, and μ is the electron mobility driving breakover element T2, and Vth is the threshold voltage of transistor T2, V
datafor being input to the voltage data signal of node N1 through the data line Data of pixel cell.Wherein V
n2computing formula as follows:
V
N2＝VDD－V
RS（2）
Wherein VDD is the supply voltage of pixel cell, V
rSfor the pressure drop of supply voltage VDD on power lead equiva lent impedance Rs.Formula (3) can be obtained by formula (1), (2):
I
D=ημ(V
data－VDD＋V
RS－Vth)
2（3）
From formula (3), the data voltage V of suitably adjustment input
data(be designated as V
d0), when through the current detecting of second switch breakover element T4 and I/V converter, the output voltage of A/D converter just greater than zero time, drive the gate source voltage of breakover element T2 just to equal threshold voltage and conducting, by data voltage V now
d0also can obtain driving the computing formula of breakover element T2 threshold voltage vt h as follows stored in storer:
Vth=V
d0－VDD＋V
RS（4）
In t2 ~ t3 time period of Fig. 3, sweep trace Scan output low level, first switch conduction elements T 1 and second switch breakover element T4 conducting, light emitting control line EM exports high level, 3rd switch conduction elements T 3 is ended, data line Data inputs the arbitrary magnitude of voltage sending between minimum brightness and the light of high-high brightness between OLED, and (data voltage that the present embodiment selects 50% high-high brightness corresponding is designated as V
d50), the detection at this moment through second switch breakover element T4 is fed back, and the A/D converter of compensator will export and data voltage V
d50corresponding data current I
d50, and stored in storer:
I
D50=ημ(V
d50－VDD＋V
RS－Vth)
2（5）
In t3 ~ t4 time period of Fig. 3, sweep trace Scan output low level, first switch conduction elements T 1 and second switch breakover element T4 conducting, light emitting control line EM exports high level, 3rd switch conduction elements T 3 is ended, OLED is not luminous, and data line Data inputs the data voltage that OLED sends the light of high-high brightness corresponding and (is designated as V
d100), the detection at this moment through second switch breakover element T4 is fed back, and the A/D converter of compensator will export and data voltage V
d100corresponding data current I
d100, and stored in storer:
I
D100=ημ(V
d100－VDD＋V
RS－Vth)
2（6）
Can be calculated driven threshold voltage vt h, the electron mobility μ of breakover element T2 and the pressure drop V of power lead equiva lent impedance by formula (4), (5), (6)
rS, and by these three values stored in storer.The pressure drop V of above-mentioned threshold voltage vt h, electron mobility μ and power lead equiva lent impedance Rs to driving breakover element T2
rSdetection, both can within the frame period of image display or other schedule time of automatically determining perform, also can perform at user's setting-up time.
Second detection period P2 is for detecting the degree of degeneration of OLED and calculating the compensation rate needed the view data inputted: in t4 ~ t5 time period of Fig. 3, be the second detection period P2.Sweep trace Scan output low level, first switch conduction elements T 1 and second switch breakover element T4 conducting, light emitting control line EM output low level, 3rd switch conduction elements T 3 conducting, data line Data input sends the arbitrary magnitude of voltage (data voltage that the present embodiment selects 50% high-high brightness corresponding) between minimum brightness and the light of high-high brightness between OLED, now OLED is luminous because electric current flows through, the anode voltage of OLED through the 3rd switch conduction elements T 3 of conducting and second switch breakover element T4 feed back input to the A/D converter of compensator and stored in storer.When OLED degenerates, its resistance will increase, and the anode voltage of OLED is also increased accordingly, and the OLED anode voltage stored in memory just reflects the degree of degeneration of OLED like this.To the detection of OLED degree of degeneration, just can start shooting in displayer and power on or the execution of other user's setting-up times.
According to threshold voltage vt h, the electron mobility μ of driving breakover element T2 that store in storer and the pressure drop V of power lead equiva lent impedance
rSjust can calculate according to formula (3) displayer of sening as an envoy to and send the view data expecting the required actual input of the light of brightness, the difference that these data and expection input data is exactly the pressure drop V of threshold voltage vt h, electron mobility μ for breakover element T2 and power lead equiva lent impedance
rSrequired compensation rate.According to the situation of change of the anode voltage of the reflection OLED degree of degeneration stored in storer, just can according to the I-V-L(current-voltage-brightness of OLED) characteristic draws corresponding drive current compensation rate, more just can calculate corresponding input compensation data amount according to formula (3).So far, the compensation rate realizing displayer object brightness and need the view data to input has just been calculated.By the display look-up table LUT of the compensation rate of each pixel cell stored in storer, as long as offset data corresponding with look-up table for the view data of input displayer is added at superimposer when actual displayed drives, with the data input pixel cell after this correction, OLED just can realize the pressure drop V of threshold voltage vt h, electron mobility μ with driving transistors, power lead equiva lent impedance
rSand the desired brightness that the changing factor such as Organic Light Emitting Diode OLED degree of degeneration has nothing to do, thus obtain the image of high-quality.
In t5 ~ t6 time period of Fig. 3, be compensation data phase P3.Sweep trace Scan output low level, first switch conduction elements T 1 and second switch breakover element T4 conducting, light emitting control line EM exports high level, 3rd switch conduction elements T 3 is ended, OLED is not luminous, data line Data inputs the viewdata signal Data2 after compensator corrects, and charges to holding capacitor Cs through the first switch conduction elements T 1 of conducting.
T6 ~ t7 time period of Fig. 3 is light emission period P4.Sweep trace Scan exports high level, first switch conduction elements T 1 and second switch breakover element T4 end, light emitting control line EM output low level, 3rd switch conduction elements T 3 conducting, drive the source-drain electrode of breakover element T2 to flow through the electric current corresponding with the data voltage that capacitor Cs stores, OLED sends the light expecting brightness.
Drive waveforms figure when Fig. 4 light emission controller shown when compensator detects that the viewdata signal Data1 of input displayer is minimum gray scale (i.e. black level).Now input the viewdata signal Data2 after overcorrect at amortization period P3 by the data line Data of pixel cell on the one hand, driving breakover element T2 is ended, on the other hand at light emission period P4, light emission controller exports high level by light emitting control line EM makes the 3rd switch conduction elements T 3 end, thus improve further to send because driving the leakage current of breakover element T2 to flow through OLED that faint half-light causes can not the problem of the pitch black image of real-playback.
Method of the present invention, can perform the step for phenomenons such as compensate for brightness inequality (MURA), image retentions before displayer shows image, but execution sequence is applicable to but is not limited only to described in the present embodiment and the order shown in Fig. 3.
Oscillogram shown in the present embodiment is for the circuit by pixel cell shown in Fig. 2 that PMOS transistor is formed, when the transistor of pixel unit circuit be made up of nmos pass transistor time, the reversal of poles of oscillogram.
Claims (4)
- The driving method of 1.AMOLED display, be applied in a kind of displayer, described displayer has the line driver and row driver that connect pel array, also there is compensating unit, the time schedule controller receiving input signal is provided with in compensating unit, described time schedule controller is connected with described row driver by superimposer, and time schedule controller is also connected with line driver simultaneously, the input end of described superimposer has also been linked in sequence storer, A/D converter and I/V converter, pel array is made up of pixel cell, each pixel cell comprises the first switch conduction element (T1) and second switch breakover element (T4), and drive breakover element (T2), two the data conducting pin data line of connecting column driver and control pin of driving breakover element (T2) respectively of the first switch conduction element (T1), drive the power supply input pin of breakover element (T2) and drive between the control pin of breakover element (T2) and be connected with capacitor (Cs), the sweep trace of the control pin of the first switch conduction element (T1) and second switch breakover element (T4) connected row driver simultaneously, the input pin of second switch breakover element (T4) is connected to the 3rd node (N3) with driving the output pin of breakover element (T2), and the output pin of second switch breakover element (T4) is connected to I/V converter and the A/D converter of compensating unit by detection line (Det), the positive pole of OLED is connected with described 3rd node (N3), it is characterized by: the time schedule controller of compensating unit receives the input signal comprising viewdata signal, time schedule controller control lines driver exports line scan signals and carries out addressing line by line to the pixel cell of pel array, described viewdata signal carries out correction process through superimposer, the image compensation data stored in viewdata signal and storer is carried out sum operation and obtains view data superposed signal by superimposer, described view data superposed signal is after row driver inputs from the data input pin of pixel cell, the OLED of pixel cell sends corresponding brightness according to the size of the view data superposed signal of input,The output terminal of the time schedule controller of compensating unit is connected with light emission controller; Have the 3rd switch conduction element (T3) in described pixel cell, control signal is delivered in pixel cell by the control pin of the 3rd switch conduction element (T3) by light emission controller; The positive pole of OLED is connected with the 3rd node (N3) with input pin by the output pin of the 3rd switch conduction element (T3); When light emission controller detects that the viewdata signal of input corresponds to minimum gray scale, export the control signal of the 3rd switch conduction element (T3) turning off pixel cell;Described driving method is divided into the first detection period, the second detection period, amortization period and light emission period;First detection period is used for detecting and calculates the pressure drop of the threshold voltage of driving breakover element (T2), electron mobility, power lead equiva lent impedance: by compensating unit and line driver by the first switch conduction element (T1) and second switch breakover element (T4) conducting, the 3rd switch conduction element (T3) ends; Detect respectively make OLED just luminous, when sending arbitrary intermediate luminance light and send high-high brightness light, drive the electric current of breakover element (T2), this electric current stores after feeding back to I/V converter by detection line (Det) after A/D converter; According to the detection electric current stored, calculate and the pressure drop of the threshold voltage of storing driver breakover element (T2), electron mobility and power lead equiva lent impedance;Second detection period is for detecting the degree of degeneration of OLED and calculating the compensation rate of needs to the view data of input: by the 3rd switch conduction element (T3) conducting, store the anode voltage value of the reflection OLED degree of degeneration feeding back to A/D converter through the first switch conduction element (T1) and second switch breakover element (T4); According to the pressure drop of the threshold voltage of driving breakover element (T2) stored, electron mobility, power lead equiva lent impedance and the voltage of reflection OLED degree of degeneration, calculate and store the compensation rate of needs to the view data inputted;In amortization period, first switch conduction element (T1) and second switch breakover element (T4) conducting, 3rd switch conduction element (T3) cut-off, make OLED not luminous, compensating unit to the viewdata signal of pixel cell input after compensator corrects, and is charged to capacitor (Cs) by the first switch conduction element (T1) of conducting;In light emission period, first switch conduction element (T1) and second switch breakover element (T4) cut-off, 3rd switch conduction element (T3) conducting, drive breakover element (T2) to flow through the electric current corresponding with the data voltage that capacitor (Cs) stores, OLED carries out luminescence.
- 2. the driving method of displayer as claimed in claim 1, it is characterized by: when the light emission controller of compensating unit detects that the viewdata signal of input is minimum gray scale, in the described amortization period, input the view data after overcorrect, driving breakover element (T2) is ended; In described light emission period, light emission controller makes the 3rd switch conduction element (T3) cut-off by light emitting control line (EM), thus cut-out makes OLED send the electric current of the driving breakover element (T2) of faint half-light.
- 3. the driving method of displayer as claimed in claim 1 or 2, is characterized by: described each breakover element is transistor.
- 4. the driving method of displayer as claimed in claim 1 or 2, is characterized by: the data in described storer are searched tableau format with display and stored.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210278780.7A CN102768821B (en) | 2012-08-07 | 2012-08-07 | AMOLED (active matrix/organic light emitting diode) display and driving method of AMOLED display |
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| CN201210278780.7A CN102768821B (en) | 2012-08-07 | 2012-08-07 | AMOLED (active matrix/organic light emitting diode) display and driving method of AMOLED display |
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