CN101192373A - Organic light emitting display and voltage compensation technology organic light emitting pixel - Google Patents
Organic light emitting display and voltage compensation technology organic light emitting pixel Download PDFInfo
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Abstract
The invention discloses an organic light emitting display and an organic light emitting pixel with the voltage compensation technology, which comprise a first capacitor, a first thin film transistor, a second thin film transistor, a third thin film transistor, a reset circuit and an organic light emitting diode. The first thin film transistor receives a first voltage and the second terminal of the first thin film transistor is coupled to the grid and the first terminal of the first capacitor. The second thin film transistor receives a second voltage and the grid of the second thin film transistor is coupled to the grid of the first thin film transistor. The third thin film transistor is coupled to the first capacitor and receives a pixel voltage and a scanning signal. The reset circuit sets the first terminal of the first capacitor to be a first voltage level. The anode of the organic light emitting diode is coupled to the second terminal of the second thin film transistor and the cathode of the organic light emitting diode receives a third voltage. The invention can improve the speed of the critical voltage compensation, and can make up for the deficiency that the picture is not uniformly displayed on the prior organic light emitting display.
Description
Technical field
The invention relates to a kind of organic light emitting display, and particularly relevant for organic light emitting display and have the organic light emission pixel of voltage compensation technology.
Background technology
The pixel of organic light emitting display (Organic Light Emitting Display) is generally with a thin film transistor (TFT) (Thin Film Transistor, TFT) collocation electric capacity comes storage assembly, with control Organic Light Emitting Diode (Organic Light Emitting Diode, brightness performance OLED).Yet above-mentioned thin film transistor (TFT) can produce critical voltage (Threshold Voltage, skew Vth) (shift) after long-time the use.This side-play amount and thin film transistor (TFT) running time and the size of current that is flow through are relevant.
In procedure for displaying, owing to be used for driving the thin film transistor (TFT) of Organic Light Emitting Diode in each pixel, the electric current during its conducting all is not quite similar.So that the thin film transistor (TFT) critical voltage side-play amount to each other that can cause these to drive usefulness is all inequality.Therefore, make the luminosity of each pixel not keep identical corresponding relation with received pixel data.So just, can make the uneven phenomenon of display frame.
In order to address the above problem, traditional organic light emission pixel has been used a kind of voltage compensation technology.Please refer to Fig. 1, it is the circuit diagram of traditional organic light emission pixel.Organic light emission pixel 100 comprises thin film transistor (TFT) MP1, MP2, MP3, MP4, MP5, storage capacitors Cst and Organic Light Emitting Diode OLED.Thin film transistor (TFT) MP3 is controlled by sweep signal Scan.Thin film transistor (TFT) MP1 bridges between thin film transistor (TFT) MP3 and storage capacitors Cst.It is shinny that thin film transistor (TFT) MP2 drives Organic Light Emitting Diode OLED according to the capacitance voltage of storage capacitors Cst when the thin film transistor (TFT) MP4 conducting.Thin film transistor (TFT) MP5 is controlled by reset signal Rst.Thin film transistor (TFT) MP4 is controlled by enable signal Enb.
Tradition organic light emission pixel 100 is utilized the critical voltage Vth2 of the thin film transistor (TFT) MP1 payment thin film transistor (TFT) MP2 identical with thin film transistor (TFT) MP2 element characteristic when writing pixel data Data.Furthermore, thin film transistor (TFT) MP3 conducting when sweep signal Scan activation makes pixel data Data charge to storage capacitors Cst via thin film transistor (TFT) MP3 and MP1.The voltage compensation characteristic of thin film transistor (TFT) MP1 utilization simultaneously itself makes X point current potential (being the grid potential of thin film transistor (TFT) MP2) than the low voltage level of Y point current potential (being the critical voltage Vth1 of thin film transistor (TFT) MP1), and then makes the source electrode of thin film transistor (TFT) MP2 and gate terminal voltage difference increase Vth1.Corresponding to critical voltage Vth2, critical voltage Vth1 (its size is equal to critical voltage Vth2 in fact) makes the source electrode of thin film transistor (TFT) MP2 and the voltage difference between grid just be equal to Vdd and pixel voltage Vdata voltage difference.Further, make electric current I by Organic Light Emitting Diode OLED
OLEDBe relevant to pixel voltage Vdata exactly.
In above-mentioned compensation technique, be to do the action of voltage compensation to remove the error that critical voltage Vth2 is produced in the data write phase.Yet in that oled panel is towards the epoch of high-res and large-sized application development now, the data write time will significantly reduce.But its not die of electric current needs the long make-up time during thin film transistor (TFT) MP1 conducting, so will make thin film transistor (TFT) MP1 possibly can't normally operate and cause the compensation mechanism inefficacy.From another point of view, in traditional its circuit design of bucking voltage technology, the current potential of nodes X, Y must guarantee all to reach steady state (SS) in the stage of " data write " in advance, otherwise has the problem (charges haring issue) that electric charge is shared when picture shows the stage.But the conventional voltage compensation technique may not have to arrive the state of the stable Vth2 of counteracting owing to deficiency of time has caused nodes X.Therefore under this state, thin film transistor (TFT) MP1 remains the situation of conducting, electric charge has taken place shared and make display brightness can't reach the desired display brightness of pixel voltage Vdata.
Summary of the invention
In view of this, purpose of the present invention is exactly to be the organic light emission pixel that a kind of organic light emitting display is provided and has voltage compensation technology, faces voltage compensation speed in order to improvement.
According to purpose of the present invention, a kind of driving method of pixel is proposed, be characterized in, this pixel has one first electric capacity, one the first film transistor, one second thin film transistor (TFT) and an Organic Light Emitting Diode, one first end of this first electric capacity couples the grid of this second film transistor, transistorized one first termination of this first film is received one first voltage, transistorized one second end of this first film is coupled to this first end of the transistorized grid of this first film and this first electric capacity, one first termination of this second thin film transistor (TFT) is received one second voltage, one second end of this second thin film transistor (TFT) is in order to export the anode of a pixel current to this Organic Light Emitting Diode, and the negative electrode of this Organic Light Emitting Diode receives a tertiary voltage.This driving method comprises: by this Organic Light Emitting Diode; In this Organic Light Emitting Diode between the off period, one the 4th voltage this first end in this first electric capacity is provided, and provide one second end of one the 5th voltage in this first electric capacity, this first film transistor turns of voltage official post between the 4th voltage and this first voltage; Between the off period and the voltage level of this second end of this first electric capacity when remaining on the 5th voltage, remove the 4th voltage in this Organic Light Emitting Diode so that the voltage level of this first end of this first electric capacity is changed into one first voltage level because of the effect of this second thin film transistor (TFT); In this Organic Light Emitting Diode between the off period and after the voltage level of this first end of this first electric capacity rose to this first voltage level, changing provided a pixel voltage this second end to this first electric capacity; And this Organic Light Emitting Diode of conducting is so that the 3rd thin film transistor (TFT) is exported this pixel current to this Organic Light Emitting Diode according to the voltage level of this first end of this first electric capacity.
According to purpose of the present invention, propose a kind of organic light emission pixel, comprise first electric capacity, the first film transistor, second thin film transistor (TFT), the 3rd thin film transistor (TFT), reset circuit and Organic Light Emitting Diode with organic light emitting display of voltage compensation technology.The first film transistor receives first voltage, and transistorized second end of the first film is coupled to grid of itself and first end of first electric capacity.Second thin film transistor (TFT) receives second voltage, and the grid of second thin film transistor (TFT) is coupled to the transistorized grid of the first film.The 3rd thin film transistor (TFT) is coupled to first electric capacity, and receives a pixel voltage and one scan signal.First end that reset circuit is set first electric capacity is first voltage level.The anode idol of Organic Light Emitting Diode is connected to second end of second thin film transistor (TFT), and the negative electrode of Organic Light Emitting Diode receives tertiary voltage.Wherein, first voltage level is lower than the voltage level of first voltage.
According to purpose of the present invention, a kind of organic light emitting display also is provided, be characterized in that comprise: at least one pixel comprises: one first electric capacity; One the first film transistor, transistorized one first termination of this first film is received one first voltage, and transistorized one second end of this first film is coupled to one first end of the transistorized grid of this first film and this first electric capacity; One second thin film transistor (TFT), one first termination of this second thin film transistor (TFT) is received one second voltage, and the grid of this second thin film transistor (TFT) is coupled to the transistorized grid of this first film; One the 3rd thin film transistor (TFT), one first termination of the 3rd thin film transistor (TFT) is received a pixel voltage, and one second end of the 3rd thin film transistor (TFT) is coupled to one second end of this first electric capacity, and the grid of the 3rd thin film transistor (TFT) is in order to receive the one scan signal; One reset circuit is one first voltage level in order to this first end of setting this first electric capacity; And an Organic Light Emitting Diode, the anode idol of this Organic Light Emitting Diode is connected to one second end of this second thin film transistor (TFT), and the negative electrode of this Organic Light Emitting Diode receives a tertiary voltage; And a driver element, in order to drive this pixel, this driver element comprises: a data drive circuit, in order to export this pixel voltage; Scan driving circuit is in order to export this sweep signal; And a sequential control circuit, to set this first end of this first electric capacity be this first voltage level in order to control this reset circuit; Wherein, this first voltage level is lower than the voltage level of this first voltage, and this driving circuit is more in order to provide this first voltage, this second voltage and this tertiary voltage.
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, below especially exemplified by a preferred embodiment, and cooperate appended graphicly, elaborate.
Description of drawings
It is a kind of internal circuit diagram with organic light emission pixel of conventional voltage compensation technique that Fig. 1 illustrates.
It is internal circuit diagram according to the organic light emission pixel with voltage compensation technology of first embodiment of the invention that Fig. 2 illustrates.
It is sequential chart according to the organic light emission pixel of first embodiment of the invention that Fig. 3 illustrates.
Fig. 4 is a kind of embodiment of reset circuit among Fig. 2.
Fig. 5 is the another kind of embodiment of reset circuit among Fig. 2.
It is according to first embodiment of the invention that Fig. 6 illustrates, and has the internal circuit diagram of the organic light emission pixel of second storage capacitors.
Fig. 7 is a kind of embodiment of the 5th thin film transistor (TFT) among Fig. 2.
Fig. 8 is the another kind of embodiment of the 5th thin film transistor (TFT) among Fig. 2.
Fig. 9 is another embodiment of the 5th thin film transistor (TFT) among Fig. 2.
It is internal circuit diagram according to the organic light emission pixel with voltage compensation technology of second embodiment of the invention that Figure 10 illustrates.
It is sequential chart according to the organic light emission pixel of second embodiment of the invention that Figure 11 illustrates.
Figure 12 is a kind of embodiment example of reset circuit among Figure 10.
Figure 13 is the another kind of embodiment example of reset circuit among Figure 10.
It is according to second embodiment of the invention that Figure 14 illustrates, and has the internal circuit diagram of the organic light emission pixel of second storage capacitors.
Figure 15 is a kind of embodiment of the 5th thin film transistor (TFT) among Figure 10.
Figure 16 is the another kind of embodiment of the 5th thin film transistor (TFT) among Figure 10.
Figure 17 is another embodiment of the 5th thin film transistor (TFT) among Figure 10.
The main element symbol description is as follows among the figure:
100,202,702,802,902,1020,1402,1502,1602,1702: the organic light emission pixel;
200,700,800,900,1000,1400,1500,1600,1700: organic light emitting display;
201,701,801,901,1001,1401,1501,1601,1701: driver element;
204,704,804,904,1004,1404,1504,1604,1704: data drive circuit;
206,706,806,906,1006,1406,1506,1606,1706: scan drive circuit
208,708,808,908,1008,1408,1508,1608,1708: sequential control circuit;
210,710,810,910,1010,1410,1510,1610,1710: reset circuit;
MP1, MP2, MP3, MP4, MP5: thin film transistor (TFT);
T1, T2, T3, T4, T5: thin film transistor (TFT);
Cst, C1, C2: storage capacitors;
OLED: Organic Light Emitting Diode.
Embodiment
The present invention proposes a kind of organic light emitting display and has the organic light emission pixel of voltage compensation technology, faces voltage compensation speed in order to improvement.
First embodiment
Please refer to Fig. 2, it is the synoptic diagram of the organic light emitting display of first embodiment of the invention.Organic light emitting display 200 comprises driver element 201 and organic light emission pixel 202.Driver element 201 is in order to drive pixel 202, and it comprises data drive circuit 204, scan drive circuit 206 and sequential control circuit 208.To export the 5th voltage to organic light emission pixel 202, wherein, the 5th voltage is pixel voltage Vdata or low level voltage Preset to data drive circuit 204 according to image data.Scan drive circuit 206 is in order to output scanning signal Scan.Sequential control circuit 208 is in order to export the first control signal Enb to the, five thin film transistor (TFT) T5, also in order to export the second control signal Rst to reset circuit 210.Driver element 201 also provides the first voltage Lock, the second voltage Vdd, tertiary voltage Vss and the 4th voltage INI.Organic light emission pixel 202 comprises first capacitor C 1, the first film transistor T 1, the second thin film transistor (TFT) T2, the 3rd thin film transistor (TFT) T3, the 4th thin film transistor (TFT) T4, reset circuit 210 and Organic Light Emitting Diode OLED.Thin film transistor (TFT) T1, T2, T3 and T4 are example with PMOS, are drawn among Fig. 2.
Plain voltage Vdata of the first termination reproduced image of the 3rd thin film transistor (TFT) T3 or low level voltage Preset, its second end are coupled to second end (be among Fig. 2 indicated node Y1) of first capacitor C 1, and its grid is in order to receive sweep signal Scan.One first termination of the first film transistor T 1 is received the first voltage Lock, and one second end and grid couple and be coupled to one first end (be among Fig. 2 indicated nodes X 1) of first capacitor C 1.One first termination of the second thin film transistor (TFT) T2 is received the second voltage Vdd.The grid of the second thin film transistor (TFT) T2 is coupled to the grid of the first film transistor T 1.One first end of the 4th thin film transistor (TFT) T4 couples one second end of the second thin film transistor (TFT) T2, and one second end of the 4th thin film transistor (TFT) T4 is coupled to the anode of Organic Light Emitting Diode OLED.The grid of the 4th thin film transistor (TFT) T4 receives the first control signal Enb.
The negative electrode of Organic Light Emitting Diode OLED receives tertiary voltage Vss.Reset circuit 210 is the first voltage level V1 in order to first end (being nodes X 1) of setting first capacitor C 1, and it is made of the 5th thin film transistor (TFT) T5.The 5th thin film transistor (TFT) T5 for example is PMOS, and its first end is coupled to the first end X1 of first capacitor C 1, and second termination is received the 4th voltage INI and its grid receives the second control signal Rst.What wherein, need pay special attention to is the voltage level that the above-mentioned first voltage level V1 is lower than the first voltage Lock.
Please refer to Fig. 3, it is the sequential chart of the organic light emission pixel of first embodiment of the invention.At zeroth order section 0 Stage when (promptly showing last picture), the voltage level of sweep signal Scan ends the 3rd thin film transistor (TFT) T3, the voltage level of the second control signal Rst makes the 5th thin film transistor (TFT) T5 end, and the voltage level of the first control signal Enb makes the 4th thin film transistor (TFT) T4 conducting.So the voltage of node Y1 is the pixel voltage Vdata ' of last picture, and the voltage of nodes X 1 is the voltage X ' of last picture.The voltage X ' of nodes X 1 is greater than first voltage.The first voltage Lock makes the first film transistor T 1 end, and voltage X ' also makes the second thin film transistor (TFT) T2 conducting and produces electric current I simultaneously
OLEDElectric current I
OLEDBe Kp* (Vsg-Vtp2)
2Vsg is the voltage difference between the second thin film transistor (TFT) T2 grid and source electrode, and it is Vdd-X '.Vtp2 is the critical voltage (Threshold Voltage) of the 3rd thin film transistor (TFT) T2.Electric current I
OLEDIt is shinny to see through the 4th thin film transistor (TFT) T4 driving Organic Light Emitting Diode OLED.
Then, when phase one I Stage, the voltage level of the second control signal Rst changes into to be changed the 5th thin film transistor (TFT) T5 conducting, the voltage level of sweep signal Scan into to make the 3rd thin film transistor (TFT) T3 conducting, and the first control signal Enb changes into the 4th thin film transistor (TFT) T4 is ended.At this moment, data drive circuit 204 provides a low level voltage Preset.The 3rd thin film transistor (TFT) T3 that low level voltage Preset sees through conducting makes the voltage of node Y1 be default low level voltage Preset, and for example-1～0 volt, and the voltage of nodes X 1 is the 4th voltage INI because of the 5th thin film transistor (TFT) T5 conducting.In this stage, by low level voltage Preset and the 4th voltage INI first capacitor C 1 of resetting.
When subordinate phase II Stage, the voltage level of the second control signal Rst changes into ends the 5th thin film transistor (TFT) T5, and the sweep signal Scan and the first control signal Enb still keep the voltage level of previous stage.So the 3rd thin film transistor (TFT) T3 still is a conducting state, the 4th thin film transistor (TFT) T4 is still for ending.At this moment, the voltage of node Y1 still is low level voltage Preset, and the voltage of nodes X 1 is because the 5th thin film transistor (TFT) T5 is the second voltage level V2 by rising to the effect of the first film transistor T 1.The second voltage level V2 is the critical voltage Vtp1 that the first voltage Lock deducts the first film transistor T 1.
During phase III III Stage (data write phase), the voltage level of the first control signal Enb changes into makes the 4th thin film transistor (TFT) T4 conducting, and the second control signal Rst still keeps with subordinate phase identical with the voltage level of sweep signal Scan.This moment, data drive circuit 204 changed output pixel voltage Vdata.It is pixel voltage Vdata that the 3rd thin film transistor (TFT) T3 that pixel voltage Vdata sees through conducting makes the voltage of node Y1.And the voltage of nodes X 1 has also been brought up to Lock-Vtp1+Vdata-Preset via the effect of first capacitor C 1, thereby makes the first film transistor T 1 end.At this moment, be the current potential that the second voltage Vdd deducts nodes X 1 at grid and the voltage difference Vsg between source electrode of the second thin film transistor (TFT) T2, i.e. Vdd-(Lock-Vtp1+Vdata-Preset).This stage focuses on, because of the 4th thin film transistor (TFT) T4 conducting makes the second thin film transistor (TFT) T2 produce corresponding conducting electric current I corresponding to the voltage difference Vsg between grid and source electrode
OLEDThe conducting electric current I
OLED=Kp* (Vsg-Vtp2)
2Voltage difference Vsg between grid and source electrode is Vdd-(Lock-Vtp1+Vdata-Preset.So electric current I
OLED=Kp* (Vdd-(Lock-Vtp1+Vdata-Preset)-Vtp2)
2So, be similar to Vtp2 because of Vtp1 again.So, electric current I
OLEDCan be considered as Kp* (Vdd-Lock-Vdata+Preset)
2Organic Light Emitting Diode is corresponding to this electric current I
OLEDProduce corresponding brightness.
(show the existing picture stage) during the 4th Phase IV Stage, make except the voltage level of sweep signal Scan changes into this moment the 3rd thin film transistor (TFT) T3 by and no longer import the pixel current potential into, other each element operation situations and node voltage all are same as phase III IIIStage.
From the above, when subordinate phase II Stage, image element circuit 202 has been finished the action of critical voltage Vtp2 compensation, thereby avoided old technology in, the thin film transistor (TFT) of former responsible critical voltage compensating movement, be the thin film transistor (TFT) MP1 among Fig. 1, make that because the conducting electric current is faint the speed of compensation mechanism is slower, cause in that the data write phase is stable yet and finish voltage compensation and caused electric charge to be shared.And then make data voltage and picture brightness that the awkward situation of error to a certain degree be arranged.On the other hand,, also can quicken the running of compensation mechanism, improve the time of compensation by the control of the first voltage Lock size.And because element that this example comprised is less, so be fit to the application of small size panel, as handheld device etc.
In addition, above-mentioned reset circuit 210 also can be realized by different circuit structures.As shown in Figure 4, it is the circuit diagram of an example of reset circuit.Reset circuit 210 ' is made of the 5th thin film transistor (TFT) T5, wherein first end of the 5th thin film transistor (TFT) T5 is coupled to first end (being nodes X 1) of first capacitor C 1, and its second end is coupled to the grid of the 5th thin film transistor (TFT) T5 and receives the second control signal Rst.Perhaps, also can be as shown in Figure 5, it is another routine circuit diagram of reset circuit.Reset circuit 210 " also constituted by the 5th thin film transistor (TFT) T5.So, first end of the 5th thin film transistor (TFT) T5 is coupled to first end (being nodes X 1) of first capacitor C 1, and its second end is coupled to the other end of first capacitor C 1, and its grid then receives the second control signal Rst.
And organic light emission pixel 202 also can couple one second capacitor C 2 more, and as shown in Figure 6, in the organic light emission pixel 202, first end of second capacitor C 2 is coupled to node Y1, and the other end of second capacitor C 2 receives the second voltage Vdd.Second capacitor C 2 can be used to help to keep the stable of voltage difference between nodes X 1 and node Y1.
Except that this, above-mentioned the 4th thin film transistor (TFT) T4 is in order to Control current I
OLEDWhether flow to Organic Light Emitting Diode OLED, its allocation position is except as shown in Figure 2, and the allocation position of the 4th thin film transistor (TFT) T4 also can be as shown in Figure 7.Fig. 7 is the synoptic diagram of the second routine organic light emitting display of present embodiment.In the organic light emission pixel 702, the 4th thin film transistor (TFT) T4 is configurable between the second voltage Vdd and the second thin film transistor (TFT) T2, promptly first termination of the 4th thin film transistor (TFT) T4 is received the second voltage Vdd, second end of the 4th thin film transistor (TFT) T4 is coupled to first end (being source electrode) of the second thin film transistor (TFT) T2, and the grid of the 4th thin film transistor (TFT) T4 receives the first control signal Enb.
Perhaps, but also bridge joint outer in the organic light emission pixel of the 4th thin film transistor (TFT) T4 with Control current I
OLEDWhether flow to Organic Light Emitting Diode OLED.As shown in Figure 8, it is the synoptic diagram of the 3rd routine organic light emitting display of present embodiment.The 4th thin film transistor (TFT) T4 bridge joint is in organic light emission pixel 802 outsides, promptly first end of the 4th thin film transistor (TFT) T4 is coupled to the negative electrode of Organic Light Emitting Diode OLED, second end of the 4th thin film transistor (TFT) T4 is coupled to tertiary voltage Vss, and the grid of the 4th thin film transistor (TFT) T4 receives the first control signal Enb.
The 4th thin film transistor (TFT) T4 bridge joint also can be between the second voltage Vdd and the second thin film transistor (TFT) T2 in the outer position of organic light emission pixel.As shown in Figure 9, it is the synoptic diagram of the 4th routine organic light emitting display of present embodiment.The 4th thin film transistor (TFT) T4 bridge joint is in organic light emission pixel 902 outsides, first end of the 4th thin film transistor (TFT) T4 is coupled to first end of the second thin film transistor (TFT) T2, second end of the 4th thin film transistor (TFT) T4 is coupled to the first voltage Vdd, and the grid of the 4th thin film transistor (TFT) T4 receives the first control signal Enb.
Second embodiment
The place that this enforcement is different from first embodiment is the structure of reset circuit.Reset circuit changes the two ends of being formed and be electrically connected at respectively first electric capacity by two thin film transistor (TFT)s, to be used for first electric capacity and the current potential of setting on the nodes X 1 of resetting.
Please refer to Figure 10, it is the synoptic diagram of the organic light emitting display of second embodiment of the invention.Organic light emitting display 1000 also comprises driver element 1001 and organic light emission pixel 1002.1001 of driver elements comprise data drive circuit 1004, scan drive circuit 1006 and time schedule controller 1008.And organic light emission pixel 1002 also comprises first capacitor C 1, the first film transistor T 1, the second thin film transistor (TFT) T2, the 3rd thin film transistor (TFT) T3, the 4th thin film transistor (TFT) T4, reset circuit 1010 and Organic Light Emitting Diode OLED.Thin film transistor (TFT) T1, T2, T3 and T4 are example with PMOS, are drawn among Figure 10.The structure of organic light emitting display 1000 as the structure shown in first embodiment, in this just no longer stating more.
What so need pay special attention to is that reset circuit 1010 is made of one the 5th thin film transistor (TFT) T5 and one the 6th thin film transistor (TFT) T6.The 5th thin film transistor (TFT) T5 and the 6th thin film transistor (TFT) T6 for example are PMOS.First end of the 5th thin film transistor (TFT) T5 is coupled to one first end (being nodes X 1) of first capacitor C 1, and second termination is received the 4th voltage INI and its grid receives the second control signal Rst1; First end of the 6th thin film transistor (TFT) is coupled to one second end (being node Y1) of first capacitor C 1, and second end also receives the 4th voltage INI and its grid receives the 3rd control signal Rst2.Wherein, the first voltage level V1 is lower than the voltage level of the first voltage Lock.
Please refer to Figure 11, it is the sequential chart of the organic light emission pixel of second embodiment of the invention.At zeroth order section 0 Stage ' when (showing last picture), the output voltage position standard of sweep signal Scan is ended the 3rd thin film transistor (TFT) T3, and the voltage level of the second control signal Rst1 and the 3rd control signal Rst2 all ends the 5th thin film transistor (TFT) T5 and the 6th thin film transistor (TFT) T6.So the voltage of node Y1 is the pixel voltage Vdata ' of last picture, and the voltage of nodes X 1 is the voltage X ' of last pixel.The voltage X ' of nodes X 1 makes the first film transistor T 1 end greater than the first voltage Lock, and voltage X ' also makes the second thin film transistor (TFT) T2 conducting and produces electric current I simultaneously
OLEDElectric current I
OLEDFor Kp* (Vdd-Y '-Vtp2)
2Vsg is the voltage difference between the second thin film transistor (TFT) T2 grid and source electrode, and it is Vdd-Y '.Vtp2 is the critical voltage (ThresholdVoltage) of the second thin film transistor (TFT) T2.Electric current I
OLEDIt is shinny to see through the 4th thin film transistor (TFT) T4 driving Organic Light Emitting Diode OLED.
Then, when phase one I Stage ', the voltage level of sweep signal Scan changes into ends the 3rd thin film transistor (TFT) T3, and the voltage level of the second control signal Rst1 and the 3rd control signal Rst2 changes into and makes the 5th thin film transistor (TFT) T5 and the equal conducting of the 6th thin film transistor (TFT) T6.So this moment, the voltage of nodes X 1 and node Y1 was the 4th voltage INI, for example be-2V～-1V.In this stage, by the 4th voltage INI first capacitor C 1 of resetting.
When subordinate phase II Stage ', the voltage level of the second control signal Rst1 transfers to ends the 5th thin film transistor (TFT) T5, and that the voltage level of the first control signal Enb, sweep signal Scan and the 3rd control signal Rst2 is still kept is identical with phase one I Stage '.So this moment, the voltage of node Y1 still was INI, and the voltage of nodes X 1 has risen to the second voltage level V2 because the 5th thin film transistor (TFT) T5 ends with the effect of the first film transistor T 1.The second voltage level V2 is the critical voltage Vtp1 that the first voltage Lock deducts the first film transistor T 1.In other words, this stage is used so that the voltage level of the second end Y1 of first capacitor C 1 is Lock-Vtp1.
During phase III III Stage ' (data write phase), the voltage level of the first control signal Enb changes into makes the 4th thin film transistor (TFT) T4 conducting, the voltage level of the 3rd control signal Rst2 changes into ends the 6th thin film transistor (TFT) T6, sweep signal Scan voltage level changes into makes the 3rd thin film transistor (TFT) T3 conducting, and the second control signal Rst1 still keeps voltage level originally.This moment, data drive circuit 1004 changed output pixel voltage Vdata.It is pixel voltage Vdata that the 3rd thin film transistor (TFT) T3 that pixel voltage Vdata sees through conducting makes the voltage of node Y1.And the voltage of nodes X 1 has also been brought up to Lock-Vtp1+Vdata-INI via the effect of first capacitor C 1, thereby makes the first film transistor T 1 end.At this moment, be the current potential that the second voltage Vdd deducts nodes X 1 at grid and the voltage difference Vsg between source electrode of the second thin film transistor (TFT) T2, i.e. Vdd-(Lock-Vtp1+Vdata-INI).On, so Vsg-Vtp=Vdd-(Lock-Vtp+Vdata-INI)-Vtp=Vdd-Lock-Vdata+INI is electric current I
OLED=Kp* (Vdd-(Lock-Vtp1+Vdata-INI)-Vtp2)
2So, be similar to Vtp2 because of Vtp1 again.So, electric current I
OLEDCan be considered as Kp* (Vdd-Lock-Vdata+INI)
2Organic Light Emitting Diode is corresponding to this electric current I
OLEDProduce corresponding brightness.
During the 4th Phase IV Stage ' (picture shows the stage), make except the voltage level of sweep signal Scan changes into this moment the 3rd thin film transistor (TFT) T3 by and no longer import the pixel current potential into, other each element operation situations and node voltage all are same as phase III IIIStage '.
From the above, when subordinate phase II Stage ', image element circuit 1002 has been finished the action of critical voltage Vtp2 compensation, thereby avoided old technology in, the thin film transistor (TFT) of former responsible critical voltage compensating movement, be the thin film transistor (TFT) MP1 among Fig. 1, make that because the conducting electric current is faint the speed of compensation mechanism is slower, cause in that the data write phase is stable yet and finish voltage compensation and caused electric charge to be shared.And then make data voltage and picture brightness that the awkward situation of error to a certain degree be arranged.On the other hand,, also can quicken the running of compensation mechanism, improve the time of compensation by the control of the first voltage Lock size.And because element that this example comprised is more, so be fit to the application of large size panel, as display device etc.
In addition, above-mentioned reset circuit 1010 also can be realized by different circuit.As shown in figure 12, it is the circuit diagram of an example of reset circuit.Reset circuit 1010 ' is made of the 5th thin film transistor (TFT) T5 and the 6th thin film transistor (TFT) T6, wherein first end of the 5th thin film transistor (TFT) T5 is coupled to first end (being nodes X 1) of first capacitor C 1, its second termination is received the 4th voltage INI, the grid of the 5th thin film transistor (TFT) T5 receives the second control signal Rst1, first end of the 6th thin film transistor (TFT) T6 is coupled to second end (being node Y1) of first capacitor C 1, its second end is coupled to second end of the 5th thin film transistor (TFT) T5, and the grid of the 6th thin film transistor (TFT) T6 receives the 3rd control signal Rst2.Perhaps, also can be as shown in figure 13, it is another routine circuit diagram of reset circuit.Reset circuit 1010 " also constituted by the 5th thin film transistor (TFT) T5 and the 6th thin film transistor (TFT) T6.So, first end of the 5th thin film transistor (TFT) T5 is coupled to first end (being nodes X 1) of first capacitor C 1, its second end is coupled to the grid of the 5th thin film transistor (TFT) T5 and receives the second control signal Rst1, first end of the 6th thin film transistor (TFT) T6 is coupled to second end (being node Y1) of first capacitor C 1, and its second end is coupled to the grid of the 6th thin film transistor (TFT) T6 and receives the 3rd control signal Rst2.
And organic light emission pixel 1002 also can couple one second capacitor C 2 more, and as shown in figure 14, in the organic light emission pixel 1402, first end of second capacitor C 2 is coupled to node Y1, and the other end of second capacitor C 2 receives the second voltage Vdd.Second capacitor C 2 can be used to help to keep the stable of voltage difference between nodes X 1 and node Y1.
In addition, above-mentioned the 4th thin film transistor (TFT) T4 is in order to Control current I
OLEDWhether flow to Organic Light Emitting Diode OLED, its allocation position is except as shown in figure 10, and the allocation position of the 4th thin film transistor (TFT) T4 also can be as shown in figure 15.Figure 15 is the synoptic diagram of the second routine organic light emitting display of present embodiment.In the organic light emission pixel 1502, first termination of the 4th thin film transistor (TFT) T4 is received the second voltage Vdd, and second end of the 4th thin film transistor (TFT) T4 is coupled to first end of the second thin film transistor (TFT) T2, and the grid of the 4th thin film transistor (TFT) T4 also receives the first control signal Enb.
But the 4th thin film transistor (TFT) T4 is bridge joint outer with Control current I in the organic light emission pixel also
OLEDWhether flow to Organic Light Emitting Diode OLED.As shown in figure 16, be the synoptic diagram of the 3rd routine organic light emitting display of present embodiment.The 4th thin film transistor (TFT) T4 bridge joint is in organic light emission pixel 1602 outsides, first end of the 4th thin film transistor (TFT) T4 is coupled to the negative electrode of Organic Light Emitting Diode OLED, second end of the 4th thin film transistor (TFT) T4 is coupled to tertiary voltage Vss, and the grid of the 4th thin film transistor (TFT) T4 receives the first control signal Enb.
The 4th thin film transistor (TFT) T4 bridge joint also can be between the second voltage Vdd and the second thin film transistor (TFT) T2 in the outer position of organic light emission pixel.As shown in figure 17, it is the synoptic diagram of the 4th routine organic light emitting display of present embodiment.The 4th thin film transistor (TFT) T4 bridge joint is in organic light emission pixel 1702 outsides, first end of the 4th thin film transistor (TFT) T4 is coupled to first end of the second thin film transistor (TFT) T2, second end of the 4th thin film transistor (TFT) T4 is coupled to the first voltage Vdd, and the grid of the 4th thin film transistor (TFT) T4 receives the first control signal Enb.
The disclosed organic light emission pixel of the above embodiment of the present invention with organic light emitting display of voltage compensation technology, can make the compensation mechanism speed improvement, and because compensation mechanism faster can remedy existing low temperature polycrystalline silicon (LTPS) technology and cause active organic light-emitting display (AMOLED) picture to show the shortcoming of uneven (Mura).
In sum; though the present invention discloses as above with preferred embodiment; right its is not in order to limit the present invention; any person skilled in the art; without departing from the spirit and scope of the present invention; when can being used for a variety of modifications and variations, so protection scope of the present invention is when with being as the criterion that claims were defined.
Claims (24)
1. the driving method of a pixel, it is characterized in that, this pixel has one first electric capacity, one the first film transistor, one second thin film transistor (TFT) and an Organic Light Emitting Diode, one first end of this first electric capacity couples the grid of this second film transistor, transistorized one first termination of this first film is received one first voltage, transistorized one second end of this first film is coupled to this first end of the transistorized grid of this first film and this first electric capacity, one first termination of this second thin film transistor (TFT) is received one second voltage, one second end of this second thin film transistor (TFT) is in order to export the anode of a pixel current to this Organic Light Emitting Diode, the negative electrode of this Organic Light Emitting Diode receives a tertiary voltage, and this driving method comprises:
By this Organic Light Emitting Diode;
In this Organic Light Emitting Diode between the off period, one the 4th voltage this first end in this first electric capacity is provided, and provide one second end of one the 5th voltage in this first electric capacity, this first film transistor turns of voltage official post between the 4th voltage and this first voltage;
Between the off period and the voltage level of this second end of this first electric capacity when remaining on the 5th voltage, remove the 4th voltage in this Organic Light Emitting Diode so that the voltage level of this first end of this first electric capacity is changed into one first voltage level because of the effect of this second thin film transistor (TFT);
In this Organic Light Emitting Diode between the off period and after the voltage level of this first end of this first electric capacity rose to this first voltage level, changing provided a pixel voltage this second end to this first electric capacity; And
This Organic Light Emitting Diode of conducting is so that the 3rd thin film transistor (TFT) is exported this pixel current to this Organic Light Emitting Diode according to the voltage level of this first end of this first electric capacity.
2. driving method as claimed in claim 1, it is characterized in that, provide the step of the 5th voltage to carry out by a data drive circuit and one the 3rd thin film transistor (TFT), one first termination of the 3rd thin film transistor (TFT) is received the 5th voltage that this data drive circuit is exported, one second end of the 3rd thin film transistor (TFT) is coupled to this second end of this first electric capacity, the grid of the 3rd thin film transistor (TFT) is in order to receive the one scan signal, when the voltage level of this sweep signal made the 3rd thin film transistor (TFT) conducting, the 3rd thin film transistor (TFT) provided the 5th voltage this second end to this first electric capacity.
3. driving method as claimed in claim 1, it is characterized in that, step by this Organic Light Emitting Diode is realized by one the 4th thin film transistor (TFT), one first end of the 4th thin film transistor (TFT) and one second end are series on the path that this pixel current flows through, this first end is source electrode or drain electrode, and this second end is drain electrode or source electrode.
4. driving method as claimed in claim 1 is characterized in that the voltage level of the 5th voltage equals the voltage level of the 4th voltage in fact.
5. an organic light emission pixel is characterized in that, comprising:
One first electric capacity;
One the first film transistor, transistorized one first termination of this first film is received one first voltage, and transistorized one second end of this first film is coupled to one first end of the transistorized grid of this first film and this first electric capacity;
One second thin film transistor (TFT), one first termination of this second thin film transistor (TFT) is received one second voltage, and the grid of this second thin film transistor (TFT) is coupled to the transistorized grid of this first film;
One the 3rd thin film transistor (TFT), one first termination of the 3rd thin film transistor (TFT) is received a pixel voltage, and one second end of the 3rd thin film transistor (TFT) is coupled to one second end of this first electric capacity, and the grid of the 3rd thin film transistor (TFT) is in order to receive the one scan signal;
One reset circuit is one first voltage level in order to this first end of setting this first electric capacity; And
One Organic Light Emitting Diode, the anode idol of this Organic Light Emitting Diode is connected to one second end of this second thin film transistor (TFT), and the negative electrode of this Organic Light Emitting Diode receives a tertiary voltage;
Wherein, this first voltage level is lower than the voltage level of this first voltage.
6. organic light emission pixel as claimed in claim 5 is characterized in that, this organic light emission pixel also comprises:
One the 4th thin film transistor (TFT), one first end of the 4th thin film transistor (TFT) is coupled to this second end of this second thin film transistor (TFT), one second end of the 4th thin film transistor (TFT) is coupled to the anode of this Organic Light Emitting Diode, and the grid of the 5th thin film transistor (TFT) receives one first control signal.
7. organic light emission pixel as claimed in claim 5 is characterized in that, this organic light emission pixel also comprises:
One the 4th thin film transistor (TFT), one first termination of the 4th thin film transistor (TFT) is received this second voltage, and one second end of the 4th thin film transistor (TFT) is coupled to this first end of this second thin film transistor (TFT), and the grid of the 4th thin film transistor (TFT) receives one first control signal.
8. organic light emission pixel as claimed in claim 5 is characterized in that, also in order to this first electric capacity of resetting, this reset circuit comprises this reset circuit:
One the 5th thin film transistor (TFT), one first end of the 5th thin film transistor (TFT) is coupled to this first end of this first electric capacity, and one second termination of the 5th thin film transistor (TFT) is received one the 4th voltage, and the grid of the 5th thin film transistor (TFT) receives one second control signal.
9. organic light emission pixel as claimed in claim 5 is characterized in that, also in order to this first electric capacity of resetting, this reset circuit comprises this reset circuit:
One the 5th thin film transistor (TFT), one first end of the 5th thin film transistor (TFT) is coupled to this first end of this first electric capacity, and one second end of the 5th thin film transistor (TFT) couples the grid of the 5th thin film transistor (TFT) and receives one second control signal.
10. organic light emission pixel as claimed in claim 5 is characterized in that, also in order to this first electric capacity of resetting, this reset circuit comprises this reset circuit:
One the 5th thin film transistor (TFT), one first end of the 5th thin film transistor (TFT) is coupled to this first end of this first electric capacity, one second end of the 5th thin film transistor (TFT) is coupled to this second end of this first electric capacity, and the grid of the 5th thin film transistor (TFT) receives one second control signal.
11. organic light emission pixel as claimed in claim 5 is characterized in that, this organic light emission pixel also comprises:
One second electric capacity, one first end of this second electric capacity is coupled to this second end of this first electric capacity, and one second termination of this second electric capacity is received this second voltage.
12. organic light emission pixel as claimed in claim 5 is characterized in that, also in order to this first electric capacity of resetting, this reset circuit comprises this reset circuit:
One the 5th thin film transistor (TFT), one first end of the 5th thin film transistor (TFT) is coupled to this first end of this first electric capacity, and one second termination of the 5th thin film transistor (TFT) is received one the 4th voltage, and the grid of the 5th thin film transistor (TFT) receives one second control signal;
One the 6th thin film transistor (TFT), one first end of the 6th thin film transistor (TFT) is coupled to this second end of this first electric capacity, and one second termination of the 6th thin film transistor (TFT) is received the 4th voltage, and the grid of the 6th thin film transistor (TFT) receives one the 3rd control signal.
13. organic light emission pixel as claimed in claim 5 is characterized in that, also in order to this first electric capacity of resetting, this reset circuit comprises this reset circuit:
One the 5th thin film transistor (TFT), one first end of the 5th thin film transistor (TFT) is coupled to this first end of this first electric capacity, and one second termination of the 5th thin film transistor (TFT) is received one the 4th voltage, and the grid of the 5th thin film transistor (TFT) receives one second control signal;
One the 6th thin film transistor (TFT), one first end of the 6th thin film transistor (TFT) is coupled to this second end of this first electric capacity, one second end of the 6th thin film transistor (TFT) is coupled to this second end of the 4th thin film transistor (TFT), and the grid of the 6th thin film transistor (TFT) receives one the 3rd control signal.
14. organic light emission pixel as claimed in claim 5 is characterized in that, also in order to this first electric capacity of resetting, this reset circuit comprises this reset circuit:
One the 5th thin film transistor (TFT), one first end of the 5th thin film transistor (TFT) is coupled to this first end of this first electric capacity, and one second end of the 5th thin film transistor (TFT) couples the grid of the 5th thin film transistor (TFT) and receives one second control signal;
One the 6th thin film transistor (TFT), one first end of the 6th thin film transistor (TFT) is coupled to this second end of this first electric capacity, and one second end of the 6th thin film transistor (TFT) couples the grid of the 6th thin film transistor (TFT) and receives one the 3rd control signal.
15. an organic light emitting display is characterized in that, comprising:
At least one pixel comprises:
One first electric capacity;
One the first film transistor, transistorized one first termination of this first film is received one first voltage, and transistorized one second end of this first film is coupled to one first end of the transistorized grid of this first film and this first electric capacity;
One second thin film transistor (TFT), one first termination of this second thin film transistor (TFT) is received one second voltage, and the grid of this second thin film transistor (TFT) is coupled to the transistorized grid of this first film;
One the 3rd thin film transistor (TFT), one first termination of the 3rd thin film transistor (TFT) is received a pixel voltage, and one second end of the 3rd thin film transistor (TFT) is coupled to one second end of this first electric capacity, and the grid of the 3rd thin film transistor (TFT) is in order to receive the one scan signal;
One reset circuit is one first voltage level in order to this first end of setting this first electric capacity; And
One Organic Light Emitting Diode, the anode idol of this Organic Light Emitting Diode is connected to one second end of this second thin film transistor (TFT), and the negative electrode of this Organic Light Emitting Diode receives a tertiary voltage; And
One driver element, in order to drive this pixel, this driver element comprises:
One data drive circuit is in order to export this pixel voltage;
Scan driving circuit is in order to export this sweep signal; And
One sequential control circuit, to set this first end of this first electric capacity be this first voltage level in order to control this reset circuit;
Wherein, this first voltage level is lower than the voltage level of this first voltage, and this driving circuit is more in order to provide this first voltage, this second voltage and this tertiary voltage.
16. organic light emitting display as claimed in claim 15 is characterized in that, this pixel also comprises:
One the 4th thin film transistor (TFT), one first end of the 4th thin film transistor (TFT) is coupled to this second end of this second thin film transistor (TFT), one second end of the 4th thin film transistor (TFT) is coupled to the anode of this Organic Light Emitting Diode, and the grid of the 4th thin film transistor (TFT) receives one first control signal by this sequential control circuit output.
17. organic light emitting display as claimed in claim 15 is characterized in that, this pixel also comprises:
One the 4th thin film transistor (TFT), one first termination of the 4th thin film transistor (TFT) is received this second voltage, one second end of the 4th thin film transistor (TFT) is coupled to this first end of this second thin film transistor (TFT), and the grid of the 4th thin film transistor (TFT) receives one first control signal by this sequential control circuit output.
18. organic light emitting display as claimed in claim 15 is characterized in that, also in order to this first electric capacity of resetting, this reset circuit comprises this reset circuit:
One the 5th thin film transistor (TFT), one first end of the 5th thin film transistor (TFT) is coupled to this first end of this first electric capacity, one second termination of the 5th thin film transistor (TFT) is received one the 4th voltage, the grid of the 5th thin film transistor (TFT) receives one second control signal, this sequential control circuit is exported this second control signal, and this driver element is in order to provide the 4th voltage.
19. organic light emitting display as claimed in claim 15 is characterized in that, also in order to this first electric capacity of resetting, this reset circuit comprises this reset circuit:
One the 5th thin film transistor (TFT), one first end of the 5th thin film transistor (TFT) is coupled to this first end of this first electric capacity, one second end of the 5th thin film transistor (TFT) couples the grid of the 5th thin film transistor (TFT), the grid of the 5th thin film transistor (TFT) receives one second control signal, and this sequential control circuit is exported this second control signal.
20. organic light emitting display as claimed in claim 15 is characterized in that, also in order to this first electric capacity of resetting, this reset circuit comprises this reset circuit:
One the 5th thin film transistor (TFT), one first end of the 5th thin film transistor (TFT) is coupled to this first end of this first electric capacity, one second end of the 5th thin film transistor (TFT) is coupled to this second end of this first electric capacity, the grid of the 5th thin film transistor (TFT) receives one second control signal, and this sequential control circuit is exported this second control signal.
21. organic light emitting display as claimed in claim 15 is characterized in that, this pixel also comprises:
One second electric capacity, one first end of this second electric capacity is coupled to this second end of this first electric capacity, and one second termination of this second electric capacity is received this second voltage.
22. organic light emitting display as claimed in claim 15 is characterized in that, also in order to this first electric capacity of resetting, this reset circuit comprises this reset circuit:
One the 5th thin film transistor (TFT), one first end of the 5th thin film transistor (TFT) is coupled to this first end of this first electric capacity, and one second termination of the 5th thin film transistor (TFT) is received one the 4th voltage, and the grid of the 5th thin film transistor (TFT) receives one second control signal;
One the 6th thin film transistor (TFT), one first end of the 6th thin film transistor (TFT) is coupled to this second end of this first electric capacity, one second termination of the 6th thin film transistor (TFT) is received the 4th voltage, the grid of the 6th thin film transistor (TFT) receives one the 3rd control signal, this sequential control circuit is exported this second control signal and the 3rd control signal, and this driving circuit is more in order to provide the 4th voltage.
23. organic light emitting display as claimed in claim 15 is characterized in that, also in order to this first electric capacity of resetting, this reset circuit comprises this reset circuit:
One the 5th thin film transistor (TFT), one first end of the 5th thin film transistor (TFT) is coupled to this first end of this first electric capacity, and one second termination of the 5th thin film transistor (TFT) is received one the 4th voltage, and the grid of the 5th thin film transistor (TFT) receives one second control signal;
One the 6th thin film transistor (TFT), one first end of the 6th thin film transistor (TFT) is coupled to this second end of this first electric capacity, one second end of the 6th thin film transistor (TFT) is coupled to this second end of the 5th thin film transistor (TFT), the grid of the 6th thin film transistor (TFT) receives one the 3rd control signal, this sequential control circuit is exported this second control signal and the 3rd control signal, and this driving circuit is more in order to provide the 4th voltage.
24. organic light emitting display as claimed in claim 15 is characterized in that, also in order to this first electric capacity of resetting, this reset circuit comprises this reset circuit:
One the 5th thin film transistor (TFT), one first end of the 5th thin film transistor (TFT) is coupled to this first end of this first electric capacity, one second end of the 5th thin film transistor (TFT) couples the grid of the 5th thin film transistor (TFT), and the grid of the 5th thin film transistor (TFT) receives one second control signal;
One the 6th thin film transistor (TFT), one first end of the 6th thin film transistor (TFT) is coupled to this second end of this first electric capacity, one second end of the 6th thin film transistor (TFT) couples the grid of the 6th thin film transistor (TFT), the grid of the 6th thin film transistor (TFT) receives one the 3rd control signal, and this sequential control circuit is exported this second control signal and the 3rd control signal.
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| CN103035201B (en) * | 2012-12-19 | 2015-08-26 | 昆山工研院新型平板显示技术中心有限公司 | Organic light-emitting diode pixel circuit, driving method and display panel thereof |
| CN104167173B (en) * | 2014-08-01 | 2017-05-17 | 上海和辉光电有限公司 | Pixel circuit for active organic light-emitting diode displayer |
| CN104167173A (en) * | 2014-08-01 | 2014-11-26 | 上海和辉光电有限公司 | Pixel circuit for active organic light-emitting diode displayer |
| CN104269139A (en) * | 2014-09-15 | 2015-01-07 | 友达光电股份有限公司 | Pixel structure and driving method thereof |
| US10115344B2 (en) | 2014-10-27 | 2018-10-30 | Everdisplay Optronics (Shanghai) Limited | Pixel circuit and light emitting display device |
| WO2016065508A1 (en) * | 2014-10-27 | 2016-05-06 | 上海和辉光电有限公司 | Pixel circuit and light-emitting display device |
| WO2016107026A1 (en) * | 2014-12-30 | 2016-07-07 | 京东方科技集团股份有限公司 | Pixel drive circuit and method, and display device |
| CN104658485B (en) * | 2015-03-24 | 2017-03-29 | 京东方科技集团股份有限公司 | OLED drives compensation circuit and its driving method |
| CN104658485A (en) * | 2015-03-24 | 2015-05-27 | 京东方科技集团股份有限公司 | OLED driving compensating circuit and driving method thereof |
| CN106205490A (en) * | 2015-05-28 | 2016-12-07 | 乐金显示有限公司 | Oled |
| CN105280140A (en) * | 2015-11-24 | 2016-01-27 | 深圳市华星光电技术有限公司 | Sensing circuit and corresponding OLED display equipment |
| CN109036284A (en) * | 2017-06-12 | 2018-12-18 | 上海和辉光电有限公司 | Pixel compensation circuit and display device |
| US11145241B2 (en) | 2018-09-14 | 2021-10-12 | Innolux Corporation | Electronic device and pixel thereof |
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Address after: Science Road, 350, Hsinchu Science Industrial Park, Miaoli, Taiwan, China, No. 160, science Road Applicant after: Chimei Optoelectronics Co., Ltd. Co-applicant after: Qijing Photoelectric Co., Ltd. Address before: China Taiwan 74144 Tainan County Tainan Science Industrial Park odd Road No. 1 Applicant before: Chimei Optoelectronics Co., Ltd. Co-applicant before: Qijing Photoelectric Co., Ltd. |
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