CN100371976C - Display pixels - Google Patents
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- CN100371976C CN100371976C CNB2004100925600A CN200410092560A CN100371976C CN 100371976 C CN100371976 C CN 100371976C CN B2004100925600 A CNB2004100925600 A CN B2004100925600A CN 200410092560 A CN200410092560 A CN 200410092560A CN 100371976 C CN100371976 C CN 100371976C
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Abstract
The present invention relates to a display pixel which is used for an organic LED display device. A drive circuit of the organic LED display device outputs data currents and scanning signals; the display pixel comprises a switch circuit, a first transistor, a second transistor, a capacitor, a switch and a light emitting assembly, wherein an input end of the switch circuit is used for receiving the data currents, and is controlled by the scanning signals. When the scanning signals are enabled, a first output end and a second output end of the switch circuit respectively output a first current and a second current. The second current charges up the capacitor to make the capacitor store between a barrier and a source cathode, and the voltages correspond to the first current flowed through the first transistor. When the scanning signals are not enabled, the switch switches on to make the first transistors and the second transistors output electric currents corresponding to the capacitive voltages to the light emitting assembly.
Description
Technical field
The present invention is relevant for a kind of pixel of display, and particularly relevant for a kind of Organic Light Emitting Diode (Organic Light Emitting Diode, pixel OLED).
Background technology
Please refer to Fig. 1, it is the image element circuit figure of traditional Organic Light Emitting Diode.The pixel 100 of Organic Light Emitting Diode comprise the first transistor Q1, transistor seconds Q2, the 3rd transistor Q3, the 4th transistor Q4, capacitor C and Organic Light Emitting Diode (Organic Light Emitting Diode, OLED).Its current drives mode is as follows: driving circuit (not being shown among Fig. 1) provides different electric currents (representing with constant current source (source current)) according to different gray-scale values, make this pixel 100 to produce corresponding capacitance voltage Vc according to the data current I of this constant current source output.That is to say that when the electric current that flows through the first transistor Q1 was almost data current I big or small, the voltage Vgs1 between its pairing the first transistor Q1 grid-source electrode was stored in and thinks capacitance voltage Vc in the capacitor C.Make that when sweep signal S was disabled, the 3rd transistor Q3, the 4th transistor Q4 and the first transistor Q1 were by (turn off).The first transistor Q1 is identical with the component characteristic of transistor seconds Q2, and capacitance voltage Vc almost is maintained voltage Vgs1, make the voltage Vgs2 between transistor seconds Q2 grid-source electrode will be substantially equal to Vgs1, at this moment, flowing through the size of current of transistor seconds Q2 in theory will be identical with data current I.
Because transistor can cause the skew (shift) of threshold voltage (Thresholdvoltage) after long-time the use, this side-play amount and transistor running time and the size of current that is flow through are relevant but in fact.Because the different length of time of the first transistor Q1 and transistor seconds Q2 conducting, promptly transistor seconds Q2 is in conducting state always.Transistor seconds Q2 all conductings during sweep signal S is activation and disabled two, and only just conducting when sweep signal S is activation of the first transistor Q1.Make that the side-play amount of threshold voltage of the first transistor Q1 and transistor seconds Q2 conducting is different.So, though though voltage Vgs2 between transistor seconds Q2 grid-source electrode and the voltage Vgs1 between the first transistor grid-source electrode equal capacitance voltage Vc, but the side-play amount of different threshold voltages makes that the threshold voltage of transistor seconds Q2 is different with the threshold voltage of the first transistor Q1.So, the size of current that transistor seconds Q2 is produced will be inequality with data current I, and make Organic Light Emitting Diode OLED brightness can't reach the pairing brightness of data current I.
Summary of the invention
In view of this, purpose of the present invention is exactly that a kind of pixel of display is being provided, with different following in identical grid-source voltage that cause of the side-play amount that solves the first transistor and the threshold voltage of transistor seconds, but make the different problem of electric current that size of current that transistor seconds produced and the first transistor are produced.
According to purpose of the present invention, a kind of pixel of display is proposed, comprise an on-off circuit, a first transistor, a transistor seconds, an electric capacity, a switch and a luminescence component.On-off circuit has an input end, one first output terminal and one second output terminal, and its input end is in order to receiving a data current, and is controlled by the one scan signal.When the sweep signal activation, on-off circuit is exported one first electric current and one second electric current respectively at first output terminal and second output terminal.
The first transistor has one first drain electrode, a first grid and one first source electrode, and first drain electrode is connected to first output terminal, and first grid is connected to second output terminal, and first source electrode is connected to a node.Transistor seconds has one second drain electrode, a second grid and one second source electrode, and second drain electrode is connected to one first set potential, and second grid connects second output terminal, and second source electrode is connected to node.
Switch has one first end and one second end, and first end is connected to one second set potential, and second end is connected to first output terminal of on-off circuit.Switch is controlled by a control signal.Control signal corresponds to sweep signal, and when sweep signal was activation, switch ended.
One end of electric capacity is connected to second output terminal of on-off circuit, and a capacitance voltage of electric capacity corresponds to the voltage between the first grid and first source electrode.And luminescence component is connected to node.Wherein, when sweep signal is disabled, switch conduction, the electric current that the first transistor and transistor seconds is exported respectively correspond to capacitance voltage is to luminescence component.
According to another object of the present invention, a kind of organic light emitting diode display is proposed, comprise one drive circuit and a plurality of pixel.Driving circuit is exported a data current and one scan signal.A plurality of pixels respectively comprise an on-off circuit, a first transistor, a transistor seconds, an electric capacity, a switch and a luminescence component.On-off circuit has an input end, one first output terminal and one second output terminal, and input end is in order to receiving data current, and is controlled by sweep signal.When the sweep signal activation, on-off circuit is exported one first electric current and one second electric current respectively at first output terminal and second output terminal.
The first transistor has one first drain electrode, a first grid and one first source electrode, and first drain electrode is connected to first output terminal, and first grid is connected to second output terminal, and first source electrode is connected to a node.Transistor seconds has one second drain electrode, a second grid and one second source electrode, and second drain electrode is connected to one first set potential, and second grid connects second output terminal, the second source electrode connected node.
Switch has one first end and one second end, and first end is connected to one second set potential, and second end is connected to first output terminal of on-off circuit.Switch is controlled by a control signal.Control signal corresponds to sweep signal, and when sweep signal was activation, switch ended.
One end of electric capacity is connected to second output terminal of on-off circuit, and a capacitance voltage of electric capacity corresponds to the voltage between the first grid and first source electrode.Luminescence component is connected to node.Wherein, when sweep signal is disabled, switch conduction, the electric current that the first transistor and transistor seconds is exported respectively correspond to capacitance voltage is to luminescence component.
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, a preferred embodiment cited below particularly, and conjunction with figs. are described in detail as follows.
Description of drawings
Fig. 1 represents the image element circuit figure of traditional Organic Light Emitting Diode.
Fig. 2 represents the circuit diagram according to a kind of organic light emitting diode display of the present invention one first embodiment.
Fig. 3 represents the circuit diagram according to a kind of organic light emitting diode display of the present invention one second embodiment.
Fig. 4 represents the circuit diagram according to a kind of organic light emitting diode display of the present invention 1 the 3rd embodiment.
The drawing reference numeral explanation
100: the pixel of Organic Light Emitting Diode
200,300,400: organic light emitting diode display
202: driving circuit
204: on-off circuit
206: luminescence component
208,308,408: pixel
C, C ': electric capacity
SW: switch
Q1, Q2, Q3, Q4, Q1 ', Q2 ', Q3 ', Q4 ': transistor
Embodiment
Please refer to Fig. 2, its expression is according to the circuit diagram of a kind of organic light emitting diode display of the present invention one first embodiment.Organic light emitting diode display 200 comprises one drive circuit 202 and a plurality of pixels, for example is a pixel 208.Driving circuit 202 is in order to the output data electric current I ' and sweep signal S.Pixel 208 comprises an on-off circuit 204, the first transistor Q1 ', transistor seconds Q2 ', switch SW, capacitor C ' and luminescence component 206.On-off circuit 204 has the 3rd transistor Q3 ' and the 4th transistor Q4 '.And the first transistor Q1 ', transistor seconds Q2 ', the 3rd transistor Q3 ' and the 4th transistor Q4 ' preferably are N type amorphous silicon film transistor, and respectively have drain electrode (drain), grid (gate) and source electrode (source).And its connection pass is: the 3rd grid G 3 ' of the 3rd transistor Q3 ' is in order to receive sweep signal S, receiving data current I ', and its 3rd source S 3 is as the first output terminal OUT1 of on-off circuit 204 as the input end IN of on-off circuit 204 for its 3rd drain D 3 '.The 4th drain D 4 ' of the 4th transistor Q4 ' connects the 3rd source S 3 ', and its 4th grid G 4 ' is in order to reception sweep signal S, and its 4th source S 4 ' is as the second output terminal OUT2 of on-off circuit 204.
First drain D 1 ' of the first transistor Q1 ' connects the first output terminal OUT1, and its first grid G1 ' connects the second output terminal OUT2, and its first source S 1 ' connects a node N.Second drain D 2 ' of transistor seconds Q2 ' is connected to the first set potential Vcc1, and its second grid G2 ' connects the second output terminal OUT2, and its second source S 2 ' connects this node N.And switch SW has the first end X1 and the second end X2, and what switch SW was preferable is a P type amorphous silicon film transistor, and its first end X1 is connected to the second set potential Vcc2, the second set potential Vcc2 preferable with the first set potential Vcc1 same potential.The second end X2 is connected to the first output terminal OUT1.
The other end of capacitor C ' an end be connected to the second output terminal OUT2, capacitor C ' and the anode of luminescence component 206 together are connected to node N.Luminescence component 206 be Organic Light Emitting Diode (OrganicLight Emitting Diode, OLED).
At first, when sweep signal S had just transferred activation (enable) to, data current I ' was most of earlier via the 4th transistor Q4 ', capacitor C ' flow to Organic Light Emitting Diode 206, and apace to capacitor C ' charging.When capacitance voltage Vc ' rises to threshold voltage (Thresholdvoltage) greater than the first transistor Q1 ', the first transistor Q1 ' conducting, after making that data current I ' shunts via the 3rd transistor Q3 ' and the 4th transistor Q4 ', export first electric current I, 1, the second output terminal OUT2 in the first output terminal OUT1 and export second electric current I 2.Because the first transistor Q1 ' is substantially the same with the threshold voltage of transistor seconds Q2 ', so during the first transistor Q1 ' conducting, also conducting of transistor seconds Q2 '.When capacitance voltage Vc ' rose, the size of first electric current I 1 rose along with capacitance voltage Vc ' and increases, and during transistor seconds Q2 ' conducting simultaneously, the 3rd electric current I 3 that flows through transistor seconds Q2 ' also rises and rises along with capacitance voltage Vc ' as I1.When capacitance voltage Vc ' rises to when being enough to allow first electric current I 1 ' be almost data current I ', voltage between grid-source electrode of the first transistor Q1 ' is Vgs1 ', capacitance voltage Vc ' equals Vgs1 ', with the voltage Vgs1 ' between grid the G1 '-source S 1 ' that maintains the first transistor Q1 ' at this moment.
Then, when sweep signal S was disabled, the 3rd transistor Q3 ' and the 4th transistor Q4 ' ended.Because control signal CS and sweep signal S are anti-phase,, make the switch SW conducting so when sweep signal S was disabled, control signal CS was activation.At this moment, because the voltage between grid G2 '-source S 2 ' of the first transistor Q1 ' and transistor seconds Q2 ' is kept the size of capacitance voltage Vc ', so the first transistor Q1 ' will continue conducting with transistor seconds Q2 '.At this moment, flow through the first transistor Q1 ' respectively and all approximate data current I ' with first electric current I 1 of transistor seconds Q2 ' and the size of the 3rd electric current I 3, the size of current that makes Organic Light Emitting Diode 206 receive is about the data current I ' of twice.That is to say, compare with the conventional pixel of Fig. 1, in order to make Organic Light Emitting Diode 206 produce identical brightness, flowing through the first transistor Q1 ' and first electric current I 1 of transistor seconds Q2 ' and the size of the 3rd electric current I 3 of present embodiment, only is the first transistor Q1 ' and half of transistor seconds Q2 ' of Fig. 1.Because the skew (shift) of transistorized threshold voltage and ON time and the size that flows through transistorized electric current become positive correlation.So the deflection rate of the first transistor Q1 ' of present embodiment and the threshold voltage of transistor seconds Q2 ' is less than conventional pixel.So, the serviceable life of the pixel 208 of present embodiment will be also longer than the conventional pixel of Fig. 1.
In addition, when the first transistor Q1 ' by switch SW conducting when sweep signal S is disabled, make this two transistor Q1 ', Q2 ' running time much at one, the side-play amount of the threshold voltage after its long-time operation is also about the same.When capacitor C ' when storing the voltage Vgs1 ' between the electric current I 1 pairing grid-source electrode flow through the first transistor Q1 ', capacitance voltage Vc ' will make transistor seconds Q2 ' produce basically the electric current I 3 identical with the electric current I 1 that flows through the first transistor Q1 ' this moment.So, can make pixel 208 produce desired object brightness, and not have the problem that traditional pixel intensity reduces.
Please refer to Fig. 3, its expression is according to the circuit diagram of a kind of organic light emitting diode display of the present invention one second embodiment.The organic light emitting diode display 200 different places of organic light emitting diode display 300 and first embodiment are that the transistor Q3 ' in the pixel 308, the connected mode of Q4 ' change parallel connection into by series connection.That is to say that the 4th drain D 4 ' of the 4th transistor Q4 ' is connected to the 3rd drain D 3 ' of the 3rd transistor Q3 '.Second embodiment has identical effect with first embodiment in addition.
Please refer to Fig. 4, its expression is according to the circuit diagram of a kind of organic light emitting diode display of the present invention 1 the 3rd embodiment.The present embodiment place different with second embodiment is in capacitor C ' connected mode, be connected in the second output terminal OUT2 of on-off circuit 204 except the one end, its other end also can be connected in the first fixed voltage Vcc1, or the second fixed voltage Vcc2, as long as capacitor C ' can store the voltage Vgs1 ' between the electric current I 1 ' pairing grid-source electrode that flows through the first transistor Q1 '.In addition, its 3rd transistor Q3 ' also can be changed into by parallel connection with the connected mode of the 4th transistor Q4 ' and connecting.
In sum, the disclosed pixel of the above embodiment of the present invention, has the data current size that is lower than under the conventional current type of drive, and the skew (shift) of the threshold voltage of transistor seconds and the first transistor (Thresholdvoltage) amount much at one, make this image element circuit think capacitance voltage according to the voltage that different bias currents produces between corresponding grid-source electrode, and on transistor seconds, produce and first electric current the 3rd electric current much at one, to Organic Light Emitting Diode, make it reach predetermined brightness with data current that twice basically is provided.
In sum; though the present invention with a preferred embodiment openly as above; right its is not in order to limit the present invention; any those skilled in the art; under the situation that does not break away from the spirit and scope of the present invention; can carry out various changes and modification, so protection scope of the present invention is as the criterion when looking the claim restricted portion that is proposed.
Claims (16)
1. the pixel of a display comprises:
One on-off circuit, have an input end, one first output terminal and one second output terminal, this input end is in order to receive a data current, and be controlled by the one scan signal, when this sweep signal activation, this on-off circuit is exported one first electric current and one second electric current respectively at this first output terminal and this second output terminal;
One the first transistor has one first drain electrode, a first grid and one first source electrode, and this first drain electrode is connected to this first output terminal, and this first grid is connected to this second output terminal, and this first source electrode is connected to a node;
One transistor seconds has one second drain electrode, a second grid and one second source electrode, and this second drain electrode is connected to one first set potential, and this second grid connects this second output terminal, and this second source electrode connects this node;
One switch, have one first end and one second end, this first end is connected to one second set potential, this second end is connected to this first output terminal, this switch is controlled by a control signal, this control signal corresponds to this sweep signal, when this sweep signal is activation, this switch according to this control signal to end;
One electric capacity, an end of this electric capacity is connected to this second output terminal, and the capacitance voltage of this electric capacity is corresponding to the voltage between this first grid and this first source electrode; And
One luminescence component is connected to this node;
Wherein, when this sweep signal is disabled, this switch conduction, the electric current that this first transistor and this transistor seconds is exported respectively correspond to this capacitance voltage is to this luminescence component.
2. pixel as claimed in claim 1, wherein this on-off circuit comprises:
One the 3rd transistor has one the 3rd drain electrode, one the 3rd grid and one the 3rd source electrode, and the 3rd grid is connected to the one scan line, and in order to receive this sweep signal, the 3rd drain electrode is as this input end, and the 3rd source electrode is as this first output terminal; And
One the 4th transistor has one the 4th drain electrode, one the 4th grid and one the 4th source electrode, and the 4th drain electrode is connected to the 3rd source electrode, and the 4th grid is connected to this sweep trace, and in order to receive this sweep signal, the 4th source electrode is as this second output terminal.
3. pixel as claimed in claim 1, wherein this on-off circuit comprises:
One the 3rd transistor has one the 3rd drain electrode, one the 3rd grid and one the 3rd source electrode, and the 3rd grid connects the one scan line, and in order to receive this sweep signal, the 3rd source electrode is as this first output terminal;
One the 4th transistor, have one the 4th drain electrode, one the 4th grid and one the 4th source electrode, the 4th drain electrode is connected to the 3rd drain electrode and as this input end, the 4th grid connects this sweep trace, in order to receive this sweep signal, the 4th source electrode is as this second output terminal.
4. pixel as claimed in claim 1, wherein the other end of this electric capacity is connected to this node, this first set potential or this second set potential.
5. pixel as claimed in claim 1, wherein this luminescence component is an Organic Light Emitting Diode.
6. as claim 2 or 3 described pixels, wherein this first transistor, this transistor seconds, the 3rd transistor and the 4th transistor are N type amorphous silicon film transistor.
7. pixel as claimed in claim 1, wherein this control signal and this sweep signal are anti-phase.
8. pixel as claimed in claim 1, wherein this first set potential and this second set potential are same potential.
9. organic light emitting diode display comprises:
One drive circuit is in order to export a data current and one scan signal; And
A plurality of pixels respectively comprise:
One on-off circuit, have an input end, one first output terminal and one second output terminal, this input end is in order to receive this data current, and be controlled by this sweep signal, when this sweep signal activation, this on-off circuit is exported one first electric current and one second electric current respectively at this first output terminal and this second output terminal;
One the first transistor has one first drain electrode, a first grid and one first source electrode, and this first drain electrode is connected to this first output terminal, and this first grid is connected to this second output terminal, and this first source electrode is connected to a node;
One transistor seconds has one second drain electrode, a second grid and one second source electrode, and this second drain electrode is connected to one first set potential, and this second grid connects this second output terminal, and this second source electrode connects this node;
One switch has one first end and one second end, and this first end is connected to one second set potential, this second end is connected to this first output terminal, and this switch is controlled by a control signal, and this control signal corresponds to this sweep signal, when this sweep signal was activation, this switch ended;
One electric capacity, an end of this electric capacity is connected to this second output terminal, and the capacitance voltage of this electric capacity is corresponding to the voltage between this first grid and this first source electrode; And
One luminescence component is connected to this node;
Wherein, when this sweep signal is disabled, this switch conduction, the electric current that this first transistor and this transistor seconds is exported respectively correspond to this capacitance voltage is to this luminescence component.
10. display as claimed in claim 9, wherein this on-off circuit comprises:
One the 3rd transistor has one the 3rd drain electrode, one the 3rd grid and one the 3rd source electrode, and the 3rd grid is connected to the one scan line, and in order to receive this sweep signal, the 3rd drain electrode is as this input end, and the 3rd source electrode is as this first output terminal; And
One the 4th transistor has one the 4th drain electrode, one the 4th grid and one the 4th source electrode, and the 4th drain electrode is connected to the 3rd source electrode, and the 4th grid is connected to this sweep trace, and in order to receive this sweep signal, the 4th source electrode is as this second output terminal.
11. display as claimed in claim 9, wherein this on-off circuit comprises:
One the 3rd transistor has one the 3rd drain electrode, one the 3rd grid and one the 3rd source electrode, and the 3rd grid connects the one scan line, and in order to receive this sweep signal, the 3rd source electrode is as this first output terminal;
One the 4th transistor, have one the 4th drain electrode, one the 4th grid and one the 4th source electrode, the 4th drain electrode is connected to the 3rd drain electrode and as this input end, the 4th grid connects this sweep trace, in order to receive this sweep signal, the 4th source electrode is as this second output terminal.
12. display as claimed in claim 9, wherein the other end of this electric capacity connects this node, this first set potential or this second set potential.
13. display as claimed in claim 9, wherein this luminescence component one Organic Light Emitting Diode.
14. as claim 10 or 11 described displays, wherein this first transistor, this transistor seconds, the 3rd transistor and the 4th transistor are N type amorphous silicon film transistor.
15. display as claimed in claim 9, wherein this control signal and this sweep signal are anti-phase.
16. display as claimed in claim 9, wherein this first set potential and this second set potential are same potential.
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| CNB2004100925600A CN100371976C (en) | 2004-11-15 | 2004-11-15 | Display pixels |
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| CNB2004100925600A CN100371976C (en) | 2004-11-15 | 2004-11-15 | Display pixels |
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| CN100371976C true CN100371976C (en) | 2008-02-27 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104282264B (en) | 2014-09-26 | 2016-09-07 | 京东方科技集团股份有限公司 | A kind of active matrix driving oganic light-emitting display device |
| CN105632405B (en) | 2016-03-18 | 2018-09-21 | 京东方科技集团股份有限公司 | A kind of pixel-driving circuit, display equipment and image element driving method |
| CN111354300A (en) * | 2019-08-14 | 2020-06-30 | Tcl科技集团股份有限公司 | Driving circuit, driving method and display device |
| TWI738435B (en) * | 2020-07-24 | 2021-09-01 | 友達光電股份有限公司 | Pixel circuit |
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