CN100363967C - Pixel driving circuit of active organic light-emitting display - Google Patents
Pixel driving circuit of active organic light-emitting display Download PDFInfo
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- CN100363967C CN100363967C CNB2004100697445A CN200410069744A CN100363967C CN 100363967 C CN100363967 C CN 100363967C CN B2004100697445 A CNB2004100697445 A CN B2004100697445A CN 200410069744 A CN200410069744 A CN 200410069744A CN 100363967 C CN100363967 C CN 100363967C
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- organic light
- transistor
- light emitting
- drive circuit
- pixel drive
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- 239000003990 capacitor Substances 0.000 description 15
- 238000010586 diagram Methods 0.000 description 8
- 239000011159 matrix material Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 229920001621 AMOLED Polymers 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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Abstract
The present invention relates to a pixel driving circuit of an active organic light emitting display. The active organic light emitting display is driven by current and is provided with a pixel driving circuit which is designed by a plurality of voltage drivers. The pixel driving circuit is connected with a comparing circuit in parallel, and the comparing circuit is at least provided with an organic light emitting diode and a transistor which respectively correspond to an organic light emitting diode and a transistor in the pixel driving circuit. The comparing circuit causes a driving current value led into the pixel driving circuit and a comparing current value led into the comparing circuit to generate a specific proportional relation.
Description
Technical field
The invention relates to a kind of active organic light-emitting display (Active Matrix OrganicLight Emitting Diode, pixel drive circuit AMOLED), especially a kind of pixel drive circuit of active organic light-emitting display of current drives.
Background technology
(Organic Light Emitting Diode, the OLED) progress of manufacturing technology utilize the manufacturing technology of organic light emitting display also gradually ripe along with Organic Light Emitting Diode.Basically, Organic Light Emitting Diode is to be arranged in the organic light emitting display in the display mode, and in order to drive these Organic Light Emitting Diodes to produce image, present employed method mainly can be divided into simple matrix formula (Simple Matrix) and two kinds of active-matrix formulas (Active Matrix).Wherein, can meet the demand that large scale or high resolving power show with the active-matrix formula again.
Please refer to shown in Figure 1ly, is the equivalent circuit diagram that an exemplary voltages drives the pixel of active organic light-emitting display.This pixel comprises an Organic Light Emitting Diode OLED, transistor T 1, a transistor T 2 and a capacitor C.Wherein, the source electrode of transistor T 1 is to be connected to a data line (not icon), to feed drive voltage signal V
Data, and its grid is to be connected to one scan line (not icon) to feed scanning current potential Scan.The source electrode of transistor T 2 is the anodes that are connected to Organic Light Emitting Diode OLED, and its drain electrode is to be connected to a voltage quasi position V
Dd, and its grid is the drain electrode that is connected to transistor T 1.The negative electrode of Organic Light Emitting Diode OLED is to be connected to another voltage quasi position Vss.The two ends of capacitor C are grid and the voltage quasi position V that is connected to transistor T 2 respectively
Dd
Make Organic Light Emitting Diode OLED keep stable luminosity in order to produce stable electric current, when the scanning current potential Scan from sweep trace was noble potential, transistor T 1 was to open, so that drive voltage signal V
DataBe able to grid and capacitor C via data line input transistors T2.And when scanning current potential Scan is in electronegative potential, transistor T 1 will be closed, and the accurate position of the voltage quasi position of drive voltage signal Vdata and aforesaid voltage V
DdPressure reduction V
Cs, be to be stored in the capacitor C.In the case, the cross-pressure V of the grid of transistor T 2 and source electrode
GsBe to be equivalent to V
Dd-V
DataAnd this cross-pressure V
GsWith the critical voltage of transistor T 2 (threshold voltage, difference Vt), be decision flow through Organic Light Emitting Diode OLED electric current I size.
Please refer to shown in Figure 2ly, is the equivalent circuit diagram that an exemplary currents drives the pixel of active organic light-emitting display.This pixel comprise an Organic Light Emitting Diode OLED, transistor T 1, transistor T 2, transistor T 3, transistor T 4, with a capacitor C.Wherein, the source electrode of transistor T 1 is to be connected to a data line (not icon), to feed a driving current signal I
Data, grid is to be connected to one scan line (not icon), to feed scanning current potential Scan, is the source electrode that is connected to transistor T 2 and drain.The grid of transistor T 2 is the grids that are connected to transistor T 4, and its drain electrode is the source electrode that is connected to the anode of Organic Light Emitting Diode OLED and transistor T 4.The source electrode of transistor T 3 is to be connected to data line to feed driving current signal I
Data, grid is to be connected to sweep trace to scan current potential Scan to feed, and its drain electrode is the grid that is connected to the grid of transistor T 2 and transistor T 4.The source electrode of transistor T 4 is the anodes that are connected to Organic Light Emitting Diode OLED, and its drain electrode is to be connected to a voltage quasi position Vdd.The negative electrode of Organic Light Emitting Diode OLED is to be connected to another voltage quasi position V
SsThe two ends of capacitor C are to be connected to the grid of transistor T 4 and the anode of Organic Light Emitting Diode OLED respectively.
Make Organic Light Emitting Diode OLED keep stable luminosity in order to produce stable electric current, scanning current potential Scan at first sees through sweep trace turn-on transistor T1 and T3, makes driving current signal I
DataProvide to transistor T 2 and capacitor C, and in capacitor C, form one corresponding to this driving current signal I
DataVoltage quasi position V
CsAnd when the scanning current potential from sweep trace S1 was electronegative potential, transistor T 1 was closed with T3.Simultaneously, because transistor T 2 is to be positioned at corresponding mirror circuit (mirror circuit) to go up (for capacitor C and Organic Light Emitting Diode OLED) with transistor T 4.Therefore, have under the situation of same electrical characteristic with T4, be stored in the voltage quasi position V in the capacitor C at transistor T 2
CsWill cause one with aforementioned driving current signal I
DataSuitable electric current I provides to Organic Light Emitting Diode OLED via transistor T 4, and makes it luminous.
As described above, and please be simultaneously with reference to shown in Figure 1, in the pixel of driven, the size of the electric current I of the Organic Light Emitting Diode of flowing through is to be subjected to critical voltage Vt to influence.Again, transistor T 2 is in operation, and its critical voltage Vt tends to rise because of the accumulation of interior electric charge, and then causes the electric current I decline of Organic Light Emitting Diode OLED of flowing through, and causes luminosity to reduce.
Otherwise in the pixel of current drives shown in Figure 2, the size of current of the Organic Light Emitting Diode OLED that flows through is determined by driving current signal I, and the change that can not be subjected to transistor T 2 and the critical voltage value of T4 influences.But, for the characteristic of current drives is provided, in this pixel, must design four transistor Ts 1, T2, T3, T4, and cause cost of manufacture to rise, and the pixel aperture opening ratio is not good.
How to avoid the influence of the change of transistor critical voltage value, reduce the interior number of electronic components of pixel simultaneously, will very significant effects be arranged for the development of organic light emitting display to improve aperture opening ratio for the luminosity of Organic Light Emitting Diode.
Summary of the invention
Fundamental purpose of the present invention is the pixel that is to overcome existing current drives organic light emitting display, and the shortcoming that its aperture opening ratio is not good proposes a kind of means of solution.
Another object of the present invention is to be to overcome the pixel that conventional voltage drives organic light emitting display, and its luminosity is difficult for keeping stable shortcoming, proposes a kind of means of solution.
The present invention provides a kind of active organic light-emitting display, and it has the pixel drive circuit of a plurality of driven designs, but utilizes a drive current to drive these pixel drive circuits.This initiatively is that organic light emitting display is characterised in that, above-mentioned pixel drive circuit is to be parallel to a comparison circuit, and this comparison circuit has an Organic Light Emitting Diode and a transistor at least, corresponds to Organic Light Emitting Diode and transistor in the pixel drive circuit respectively.See through this comparison circuit, can make driving current value that feeds pixel drive circuit and the comparison current value that feeds the comparison circuit produce a specific proportionate relationship.
The present invention also provides a kind of pixel drive circuit of active organic light-emitting display, described driving circuit comprises: at least one pixel drive circuit, each this pixel drive circuit comprises: a first transistor, its source electrode are to be connected to a data line, and its grid is to be connected to the one scan line; One transistor seconds, its grid are the drain electrodes that is connected to this first transistor, and the drain electrode of this transistor seconds is to be connected with one first voltage quasi position; One electric capacity, one first end is the drain electrode that is connected to this transistor seconds, one second end is to be connected to the source electrode of this first transistor and the grid of this transistor seconds; One Organic Light Emitting Diode, its anode are the source electrodes that is connected to this transistor seconds, and the negative electrode of this Organic Light Emitting Diode is to be connected with one second voltage quasi position; At least one comparison circuit is electrically connected to this pixel drive circuit, and each this comparison circuit comprises: a comparison transistor, and corresponding to this transistor seconds, its grid and drain electrode are to be connected to this data line; One comparison Organic Light Emitting Diode, corresponding to this Organic Light Emitting Diode, its anode is to be connected to this to compare transistorized source electrode, its negative electrode is to be connected with this second voltage quasi position.
This second voltage quasi position is a ground connection.
Description of drawings
Fig. 1 is the equivalent circuit diagram that an exemplary voltages drives the pixel of active organic light-emitting display;
Fig. 2 is the equivalent circuit diagram that an exemplary currents drives the pixel of active organic light-emitting display;
Fig. 3 is the driving circuit of active organic light-emitting display of the present invention, the block schematic diagram of a preferred embodiment;
Fig. 4 be among Fig. 3 single pixel drive circuit with see through the equivalent circuit diagram that data line is parallel to a comparison circuit of this pixel drive circuit.
Symbol description:
Driving circuit～100
Data-driven unit～120
Scan drive cell～140
Power-supply unit～150
Pixel drive circuit～160
Data line～122
Sweep trace 142
Comparison circuit～180
Power lead～152
Embodiment
Can describe in detail and appended graphic being further understood by following invention preferred embodiment about the advantages and spirit of the present invention.
Please refer to shown in Figure 3ly, is the block schematic diagram of driving circuit 100, one preferred embodiments of active organic light-emitting display of the present invention.This driving circuit 100 comprises a data-driven unit 120, one scan driver element 140, a power-supply unit 150, a plurality of pixel drive circuit 160 and a plurality of comparison circuit 180.Wherein, each pixel drive circuit 160 is to be display to arrange.Data-driven unit 120 is to see through a plurality of data lines 122, connects each row pixel drive circuit 160 and comparison circuit 180 respectively.Scan drive cell 140 is to see through a plurality of sweep traces 142, connects each row pixel drive circuit 160 respectively.Power-supply unit 150 provides each pixel driving unit 160 and drives the luminous needed power supply of its inner Organic Light Emitting Diode.Each row pixel drive circuit 160 is to see through data line 122 to be coupled with a comparison circuit 180 bottom.And this comparison circuit 180 is in order to produce the effect of the mirror circuit in the pixel that drives as conventional current shown in Figure 2.
Please refer to shown in Figure 4ly, is single pixel drive circuit 160 among Fig. 3, and sees through the equivalent circuit diagram that data line 122 is parallel to a comparison circuit 180 of this pixel drive circuit 160.As shown in FIG., this pixel drive circuit 160 comprises a first transistor T1, a transistor seconds T2, a capacitor C and an Organic Light Emitting Diode OLED.Wherein, the source electrode of the first transistor T1 is to be connected to data line 122, and grid is to be connected to sweep trace 142.The grid of transistor seconds T2 is the drain electrode that is connected to the first transistor T1, and the drain electrode of transistor seconds T2 is connected to power-supply unit 150 through power lead 152, to feed one first voltage quasi position Vdd.One end of capacitor C is the drain electrode that is connected to transistor seconds T2, and the other end is to be connected to the source electrode of the first transistor T1 and the grid of transistor seconds T2.The anode of Organic Light Emitting Diode OLED is the source electrode that is connected to transistor seconds T2, and its negative electrode is to be connected with one second voltage quasi position Vss, and this second voltage quasi position is a ground connection.
This comparison circuit 180 comprises a comparison transistor T m and a comparison Organic Light Emitting Diode OLEDm.Wherein, comparison transistor T m is corresponding to the transistor seconds T2 in the pixel drive circuit 160, and the grid of this comparison transistor T m is to be connected to data line 122, and its drain electrode also is to be connected to data line 122.Comparison Organic Light Emitting Diode OLEDm is corresponding to the Organic Light Emitting Diode OLED in the pixel drive circuit 160, and its anode is the source electrode that is connected to above-mentioned comparison transistor T m, and its negative electrode is to be connected with the above-mentioned second voltage quasi position Vss.
When a given driving current signal I input comparison circuit 180, then compare the grid of transistor T m and the cross-pressure V of source electrode
Gs 'With comparison transistor T m critical voltage V
T 'Poor (V
Gs '-V
T ') also determine thereupon.And in the case, the voltage quasi position V that data line 122 is had
Data=V
Gs '+ V
Oled '+ V
SsWherein, V
Oled 'Be the anode of comparison Organic Light Emitting Diode OLEDm and the cross-pressure between negative electrode.
At the same time, the one scan current potential is to see through in the sweep trace 142 input pixel drive circuits 160 to open the first transistor T1, so as to store the voltage quasi position V of the first voltage quasi position Vdd and above-mentioned data line 122 in capacitor C
DataPressure reduction.In the case, the cross-pressure V of the grid of transistor seconds T2 and source electrode
GsBe to be equivalent to V
Data-V
Oled-V
Ss, V wherein
OledBe the anode of this Organic Light Emitting Diode OLED and the cross-pressure between negative electrode.
Because the voltage quasi position V that data line 142 is had
Data=V
Gs '+ V
Oled '+ V
Ss, and the cross-pressure V of the grid of transistor seconds T2 and source electrode
Gs=V
Data-V
Oled-V
SsTherefore, can calculate and learn that the cross-pressure Vgs of the grid of transistor seconds T2 and source electrode is equivalent to V
Gs '-(V
Oled-V
Oled ').And this cross-pressure V
GsWith the difference of the critical voltage Vt of transistor seconds T2, the i.e. decision electric current I of Organic Light Emitting Diode OLED of flowing through ' size.
By aforementioned, driving circuit of the present invention as can be known, its characteristic is:
Because comparison Organic Light Emitting Diode OLEDm and Organic Light Emitting Diode OLED have the approximate running time, therefore, the rising situation of cross-pressure is also similar between anode of the two and negative electrode, that is to say V
OledApproximate V
Oled 'And as described above, the cross-pressure V of the grid of transistor seconds T2 and source electrode
Gs=V
Gs '-(V
Oled-V
Oled '), can know the cross-pressure V of the grid of transistor seconds T2 and source electrode by inference
GsBe to be equivalent to compare the grid of transistor T m and the cross-pressure V of source electrode
Gs 'Again, the grid of comparison transistor T m and the cross-pressure V of source electrode
Gs 'Be to be activated current signal I to determine, and the cross-pressure V of the grid of transistor seconds and source electrode
GsSize be determined the to flow through electric current I of Organic Light Emitting Diode OLED ' size.Therefore, the present invention can be directly the influence of the size of ' size, and avoided the cross-pressure of Organic Light Emitting Diode OLED to change ' by the flow through electric current I of Organic Light Emitting Diode of driving current signal I decision for electric current I.
Because comparison transistor T m and transistor seconds T2 have the approximate running time, the critical voltage V of the two
T 'With V
tAscensional range also similar.And for example above-mentioned, the cross-pressure V of the grid of transistor seconds T2 and source electrode
GsBe to be equivalent to compare the grid of transistor T m and the cross-pressure Vg of source electrode
S 'Therefore, comparison transistor T m and transistor seconds T2, the poor (V of the cross-pressure of its grid and source electrode and critical voltage
Gs-V
t) and (V
Gs '-V
T ') be suitable.Hence one can see that, under comparison transistor T 2 situation identical with the breadth length ratio (W/L) of the raceway groove of transistor seconds Tm, the electric current I of the Organic Light Emitting Diode OLED that flows through ' size can't be subjected to critical voltage V
tWith V
T 'The influence of rising, and can be with driving current signal I big or small identical.
As above-mentioned, at transistor seconds T2 and comparison transistor T m, the poor (V of the cross-pressure of its grid and source electrode and critical voltage
Gs-V
t) and (V
Gs '-V
T ') under the sizable situation.The breadth length ratio of the raceway groove of comparison transistor T m and transistor seconds T2 will influence driving current signal I and electric current I ' proportionate relationship.For instance, if when the breadth length ratio of the raceway groove of comparison transistor T m is the twice of breadth length ratio of raceway groove of transistor seconds T2, under identical cross-pressure, (be V
GsThe rough V that equals
Gs '), slightly flow through the approximately electric current I of transistor seconds T2 of the driving current signal I of the comparison transistor T m that flows through ' two times.And utilize this notion, even if under the situation of low luminosity (electric current I of transistor seconds T2 in the pixel drive circuit 160 of promptly flowing through ' faint situation under), in data line 122, still can keep relatively large driving current signal I, provide enough fast charging rate with capacitor C, guarantee that capacitor C charges to default potential value pixel drive circuit 160.
Shown in the 3rd and four figure, though driving circuit of the present invention 100 is to utilize current drives,, two transistor Ts 1 of 160 needs of each pixel drive circuit and T2, but not, must use four transistors as the pixel that the conventional current of Fig. 2 drives.Therefore, the design of driving circuit 100 of the present invention can promote the aperture opening ratio of each pixel.
Claims (6)
1. the pixel drive circuit of an active organic light-emitting display is characterized in that described driving circuit comprises:
At least one pixel drive circuit, each this pixel drive circuit comprises:
One the first transistor, its source electrode are to be connected to a data line, and its grid is to be connected to the one scan line;
One transistor seconds, its grid are the drain electrodes that is connected to this first transistor, and the drain electrode of this transistor seconds is to be connected with one first voltage quasi position;
One electric capacity, one first end is the drain electrode that is connected to this transistor seconds, one second end is to be connected to the source electrode of this first transistor and the grid of this transistor seconds;
One Organic Light Emitting Diode, its anode are the source electrodes that is connected to this transistor seconds, and the negative electrode of this Organic Light Emitting Diode is to be connected with one second voltage quasi position;
At least one comparison circuit is electrically connected to this pixel drive circuit, and each this comparison circuit comprises:
One comparison transistor, corresponding to this transistor seconds, its grid and drain electrode are to be connected to this data line;
One comparison Organic Light Emitting Diode, corresponding to this Organic Light Emitting Diode, its anode is to be connected to this to compare transistorized source electrode, its negative electrode is to be connected with this second voltage quasi position.
2. the pixel drive circuit of a kind of active organic light-emitting display according to claim 1, it is characterized in that: the breadth length ratio of the raceway groove of this this transistor seconds of comparison transistor AND gate is to have a specific proportionate relationship.
3. the pixel drive circuit of a kind of active organic light-emitting display according to claim 1, it is characterized in that: the breadth length ratio of the raceway groove of this this transistor seconds of comparison transistor AND gate is identical.
4. the pixel drive circuit of a kind of active organic light-emitting display according to claim 1, it is characterized in that: each this comparison circuit is to correspond to this data line.
5. the pixel drive circuit of a kind of active organic light-emitting display according to claim 1, it is characterized in that: this first voltage quasi position is to provide to this transistor seconds via a power lead.
6. the pixel drive circuit of a kind of active organic light-emitting display according to claim 1, it is characterized in that: this second voltage quasi position is a ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100697445A CN100363967C (en) | 2004-07-14 | 2004-07-14 | Pixel driving circuit of active organic light-emitting display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100697445A CN100363967C (en) | 2004-07-14 | 2004-07-14 | Pixel driving circuit of active organic light-emitting display |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1588519A CN1588519A (en) | 2005-03-02 |
| CN100363967C true CN100363967C (en) | 2008-01-23 |
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|---|---|---|---|
| CNB2004100697445A Expired - Lifetime CN100363967C (en) | 2004-07-14 | 2004-07-14 | Pixel driving circuit of active organic light-emitting display |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI262743B (en) | 2005-10-12 | 2006-09-21 | Au Optronics Corp | A controlling element of an organic electro-luminescent display and manufacturing process thereof |
| CN100342525C (en) * | 2005-10-28 | 2007-10-10 | 友达光电股份有限公司 | Control circuit for organic electroluminescent diode and producing method thereof |
| CN109872670B (en) * | 2017-12-05 | 2021-11-05 | 京东方科技集团股份有限公司 | Display screen, display device, display circuit and brightness compensation method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002071379A2 (en) * | 2000-07-18 | 2002-09-12 | Emagin Corporation | A current-type driver for organic light emitting diode displays |
| JP2003208124A (en) * | 2002-01-10 | 2003-07-25 | Sanyo Electric Co Ltd | Display device |
| CN1440013A (en) * | 2003-02-24 | 2003-09-03 | 统宝光电股份有限公司 | Electroluminescence type active array picture element driving circuit in display screen |
| JP2003255896A (en) * | 2002-03-01 | 2003-09-10 | Semiconductor Energy Lab Co Ltd | Display device, light emitting device and electronic equipment |
| CN1506931A (en) * | 2002-12-12 | 2004-06-23 | ������������ʽ���� | Electrooptical device, driving method for electrooptical device and electronic equipment |
-
2004
- 2004-07-14 CN CNB2004100697445A patent/CN100363967C/en not_active Expired - Lifetime
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002071379A2 (en) * | 2000-07-18 | 2002-09-12 | Emagin Corporation | A current-type driver for organic light emitting diode displays |
| JP2003208124A (en) * | 2002-01-10 | 2003-07-25 | Sanyo Electric Co Ltd | Display device |
| JP2003255896A (en) * | 2002-03-01 | 2003-09-10 | Semiconductor Energy Lab Co Ltd | Display device, light emitting device and electronic equipment |
| CN1506931A (en) * | 2002-12-12 | 2004-06-23 | ������������ʽ���� | Electrooptical device, driving method for electrooptical device and electronic equipment |
| CN1440013A (en) * | 2003-02-24 | 2003-09-03 | 统宝光电股份有限公司 | Electroluminescence type active array picture element driving circuit in display screen |
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| CN1588519A (en) | 2005-03-02 |
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