CN103440845A - Pixel drive circuit of organic light emitting diode - Google Patents
Pixel drive circuit of organic light emitting diode Download PDFInfo
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- CN103440845A CN103440845A CN2013103706661A CN201310370666A CN103440845A CN 103440845 A CN103440845 A CN 103440845A CN 2013103706661 A CN2013103706661 A CN 2013103706661A CN 201310370666 A CN201310370666 A CN 201310370666A CN 103440845 A CN103440845 A CN 103440845A
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- voltage
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- light emitting
- emitting diode
- organic light
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Abstract
A pixel drive circuit of an organic light emitting diode comprises a first transistor and a capacitor. The first transistor comprises a first end, a control end and a second end, and the capacitor comprises a first end and a second end. The first end of the capacitor and the first end of the first transistor are electrically coupled to a first node, and the second end of the capacitor and the second end of the first transistor are electrically coupled to a second node. In a first period, a power supply does not supply power supply voltage to the first node, data voltage is written into the first node, and variable voltage is written into the second node. In a second period, the power supply supplies the power supply voltage to the first node so that the voltage value of the first node can be improved to the power supply voltage value, correspondingly, the voltage value of the second node is improved to a value obtained by subtracting the data voltage value from the sum of the variable voltage value and the power supply voltage value, and the first transistor provides drive current for the organic light emitting diode according to the voltage of the first node and the voltage of the second node.
Description
Technical field
The invention relates to a kind of pixel-driving circuit, and particularly relevant for a kind of pixel-driving circuit of Organic Light Emitting Diode.
Background technology
In traditional display device, power supply sees through wire provides voltage to driving circuit, yet, because there is impedance in wire itself, therefore, will inevitably produce the phenomenon of voltage decline at wire end, and this phenomenon will cause the pixel driving current of Organic Light Emitting Diode to descend, make display device produce the situation of light and shade inequality.Along with scientific and technological development, display device is gradually towards large-sized direction progress, and above-mentioned phenomenon is especially obvious in large-sized display device.
In addition, the transistor adopted in pixel-driving circuit due to Organic Light Emitting Diode is not quite similar, therefore, its processing procedure and component characteristic are inevitable different, when processing procedure difference or all the other factors difference, to cause transistorized critical voltage difference, and so, also can cause display device to produce the phenomenon of light and shade inequality.
Moreover, the component lifecycle of Organic Light Emitting Diode is limited, and therefore, the characteristic of Organic Light Emitting Diode will fail gradually along with displaying time, this phenomenon also will affect the brightness of Organic Light Emitting Diode, and then make display device produce the situation of light and shade inequality.
Summary of the invention
One purpose of content of the present invention is that a kind of pixel-driving circuit of Organic Light Emitting Diode is being provided, so as to improving the existing problem of prior art.
For reaching above-mentioned purpose, a technology aspect of content of the present invention is the pixel-driving circuit about a kind of Organic Light Emitting Diode.The pixel-driving circuit of aforementioned Organic Light Emitting Diode comprises the first transistor and electric capacity, and the first transistor comprises first end, control end and the second end, and electric capacity comprises first end and the second end.The first end of the first transistor is electrically coupled to power supply, the second end of the first transistor is electrically coupled to Organic Light Emitting Diode, the first end of electric capacity and the first end of the first transistor are electrically coupled to first node, and the second end of electric capacity and the control end of the first transistor are electrically coupled to Section Point.In first period power supply do not supply power supply supply voltage and give first node, first node is written into data voltage, Section Point is written into variable voltage.Give first node in second phase power supply supply power supply supply voltage, make the voltage of first node be promoted to power supply supply voltage, and correspondingly the voltage of Section Point is raised to variable voltage and power supply supply voltage sum and deducts data voltage, the first transistor according to the voltage of the voltage of first node and two nodes to provide drive current to give Organic Light Emitting Diode.
According to one embodiment of the invention, aforementioned variable voltage can be adjusted, with the compensation drive current.
According to another embodiment of the present invention, aforementioned data voltage can be adjusted, with the compensation drive current.
According to yet another embodiment of the invention, aforementioned drive current is to produce according to following formula:
；
I wherein
oLEDfor drive current, K be the first transistor conduction parameter, V
datafor data voltage, V
rfor variable voltage, V
tHcritical voltage for the first transistor.
According to further embodiment of this invention, aforementioned variable voltage can be adjusted, with the critical voltage of compensation the first transistor.
According to another embodiment of the present invention, aforementioned data voltage can be adjusted, with the critical voltage of compensation the first transistor.
According to yet another embodiment of the invention, aforementioned Organic Light Emitting Diode is electrically coupled to reference voltage end, wherein reference voltage end is not supplied reference voltage in first period and is given Organic Light Emitting Diode, and reference voltage end is given Organic Light Emitting Diode in second phase supply reference voltage.
According to further embodiment of this invention, the pixel-driving circuit of aforementioned Organic Light Emitting Diode more comprises transistor seconds and the 3rd transistor.Transistor seconds and the 3rd transistor all comprise first end, control end and the second end.The first end of transistor seconds is electrically coupled to first node, and the control end of transistor seconds is electrically coupled to sweep trace, and the second end of transistor seconds is electrically coupled to data line.The 3rd transistorized first end is electrically coupled to Section Point, and the 3rd transistorized control end is electrically coupled to sweep trace, and the 3rd transistorized the second end is electrically coupled to variable power supply.In first period, sweep trace transmits control end and the three transistorized control end of scanning voltage to transistor seconds, transistor seconds is opened and to first node data writing voltage, and the 3rd transistor is opened and Section Point is write to variable voltage.
According to another embodiment of the present invention, aforementioned the first transistor is the P transistor npn npn, and second and third transistor is the N-type transistor.
According to yet another embodiment of the invention, aforementioned first, second and third transistor is all the P transistor npn npn.
Therefore, according to technology contents of the present invention, the embodiment of the present invention is by a kind of driving circuit is provided, the problem of the display device light and shade inequality produced so as to the characteristic decline improved due to voltage decline, transistorized critical voltage difference and Organic Light Emitting Diode.
The accompanying drawing explanation
For above and other purpose of the present invention, feature, advantage and embodiment can be become apparent, appended graphic being described as follows:
Fig. 1 is the schematic diagram illustrated according to the pixel-driving circuit of a kind of Organic Light Emitting Diode of one embodiment of the invention;
Fig. 2 is the schematic diagram illustrated according to the drive waveforms of the pixel-driving circuit of the Organic Light Emitting Diode of Fig. 1 of the present invention;
Fig. 3 is the checking schematic diagram illustrated according to the pixel-driving circuit of the Organic Light Emitting Diode of Fig. 1 of the present invention.
[primary clustering symbol description]
100: driving circuit
200: Organic Light Emitting Diode
300: sweep trace
400: data line
C
s: electric capacity
I
oLED: drive current
K: the conduction parameter of the first transistor
T1: first period
T2: the second phase
M1: the first transistor
M2: transistor seconds
M3: the 3rd transistor
N1: first node
N2: Section Point
V
data: data voltage
V
d: drain voltage
V
g: grid voltage
V
h: power supply
V
h: power supply supply voltage
V
l: reference voltage end
V
l: reference voltage
V
r: variable power supply
V
r: variable voltage
V
scan: scanning voltage
V
s: source voltage
V
sG: the first end of the first transistor and the voltage difference between control end.
Embodiment
Fig. 1 illustrates a kind of schematic diagram of pixel-driving circuit 100 of Organic Light Emitting Diode according to one embodiment of the invention.As shown in the figure, the pixel-driving circuit 100 of Organic Light Emitting Diode is to drive Organic Light Emitting Diode 200.The pixel-driving circuit 100 of aforementioned Organic Light Emitting Diode comprises the first transistor M1 and capacitor C
s, the first transistor M1 comprises first end, control end and the second end, capacitor C
scomprise first end and the second end.The first end of the first transistor M1 is electrically coupled to power supply V
h, the second end of the first transistor M1 is electrically coupled to Organic Light Emitting Diode 200, capacitor C
sfirst end and the first end of the first transistor M1 be electrically coupled to first node N1, capacitor C
sthe second end and the control end of the first transistor M1 be electrically coupled to Section Point N2.
Moreover, for making the present invention, be easier to understand, at this, please coordinate in the lump Fig. 2 with exemplary explanation this case, it is the schematic diagram illustrated according to a kind of drive waveforms of the pixel-driving circuit of the Organic Light Emitting Diode of Fig. 1 of the present invention, wherein V
hfor power supply V
hthe power supply supply voltage of exporting.As shown in the figure, in first period T1 power supply V
hdo not supply power supply supply voltage V
hgive first node N1, at the same time, first node N1 is written into data voltage V
data, Section Point N2 is written into variable voltage V
r.
In second phase T2 power supply V
hsupply power supply supply voltage V
hgive first node N1, mat makes the voltage of first node N1 be promoted to power supply supply voltage V
h, and correspondingly the voltage of Section Point N2 is raised to variable voltage V
rwith power supply supply voltage V
hsum deducts data voltage V
data.Subsequently, the first transistor M1 can be according to the voltage of the voltage of first node N1 and Section Point N2 to provide drive current I
oLEDgive Organic Light Emitting Diode 200.
Thus, due to variable voltage V
rcan be adjusted according to user's demand, therefore, as power supply V
hthe power supply supply voltage V of supply
hwhen the voltage decline is arranged through wire, can be by adjusting variable voltage V
rand the voltage of compensation decline in addition, causes display device to produce light and shade when uneven when the characteristic decline of Organic Light Emitting Diode 200, can see through and adjust variable voltage V
rand the characteristic decline of compensation Organic Light Emitting Diode 200.
Sum up and opinion, when the parameter of the electronic package of display device is different or during decline, all can see through driving circuit 100 of the invention process to adjust variable voltage V
rit is compensated, and then improve the problem of the light and shade inequality of display device, improve the display quality of display device.
In the present embodiment, except aforementioned variable voltage V
rcan be adjusted, with compensation drive current I
oLEDin addition, aforementioned data voltage V
dataalso can be adjusted, with compensation drive current I
oLED, be with drive current I
oLEDsize be maintained, and then maintain the brightness of display device, promote the display quality of display device.
About aforementioned drive current I
oLED, its prime formula is:
I wherein
oLEDfor drive current, K be the first transistor M1 conduction parameter, V
sGfor the first end of the first transistor M1 and the voltage difference between control end, V
tHcritical voltage for the first transistor M1.
In electrical operation, at first, driving circuit 100 at first period T1 in first node N1 data writing voltage V
data, write variable voltage V in Section Point N2 simultaneously
r.Secondly, the first node N1 of driving circuit 100 receives power supply V in the second phase
hsupply power supply supply voltage V
h, make the voltage of first node N1 be promoted to power supply supply voltage V
h, and correspondingly the voltage of Section Point N2 is raised to variable voltage V
rwith power supply supply voltage V
hsum deducts data voltage V
data.
For example, the first end of the first transistor M1 can be source electrode, the control end of the first transistor M1 can be grid, because first node N1 is electrically coupled to the source electrode of the first transistor M1, and Section Point N2 is electrically coupled to the grid of the first transistor M1, that is, when second phase T2, the voltage of the source electrode of the first transistor M1 is V
h, and the voltage of the grid of the first transistor M1 is V
r+ V
h-V
data, bring above-mentioned magnitude of voltage into formula (1), can obtain following formula:
V wherein
datafor data voltage, V
rfor variable voltage.
Moreover, after above-mentioned formula (2) is arranged, can obtain following formula:
Accordingly, when the parameter of the electronic package of display device is different or during decline, from above-mentioned formula, be capable of regulating variable voltage V by driving circuit 100 of the invention process
rit is compensated, and then improve the problem of the light and shade inequality of display device, improve the display quality of display device.
In the present embodiment, the variable voltage V in aforementioned formula
rcan be adjusted, with the critical voltage V of compensation the first transistor M1
tH, moreover, aforementioned data voltage V
dataalso can be adjusted, with the critical voltage V of compensation the first transistor M1
tHthereby, make drive current I
oLEDremain stable, and then maintain the brightness of display device, promote the display quality of display device.
In the present embodiment, referring to Fig. 1 and Fig. 2, Organic Light Emitting Diode 200 is electrically coupled to reference voltage end V
l, reference voltage end V wherein
ldo not supply reference voltage V in first period T1
lgive Organic Light Emitting Diode 200, this reference voltage end V
ljust to supply reference voltage in second phase T2 to give Organic Light Emitting Diode 200.
Refer to Fig. 1, the pixel-driving circuit 100 of aforementioned Organic Light Emitting Diode is the Organic Light Emitting Diode 200 that drives display panel, display panel comprises sweep trace 300 and data line 400, and wherein the pixel-driving circuit 100 of Organic Light Emitting Diode also comprises transistor seconds M2 and the 3rd transistor M3.Transistor seconds M2 and the 3rd transistor M3 all comprise first end, control end and the second end.The first end of transistor seconds M2 is electrically coupled to first node N1, and the control end of transistor seconds M2 is electrically coupled to sweep trace 300, and the second end of transistor seconds M2 is electrically coupled to data line 400.
Moreover the first end of the 3rd transistor M3 is electrically coupled to Section Point N2, the second end that the control end of the 3rd transistor M3 is electrically coupled to sweep trace 300, the three transistor M3 is electrically coupled to variable power supply V
r.
Similarly, for making the present invention, be easier to understand, please in the lump with reference to Fig. 1 and Fig. 2, in first period T1, sweep trace 300 transmits scanning voltage V
scanto the control end of transistor seconds M2 and the control end of the 3rd transistor M3, transistor seconds M2 is opened and to first node N1 data writing voltage V
data, and the 3rd transistor M3 opens and Section Point N2 is write to variable voltage V
r, data voltage V wherein
dataexported variable voltage V by data line 400
rby variable power supply V
rinstitute exports.
Thus, the user can be according to demand by variable power supply V
rto variable voltage V
radjusted, therefore, as power supply V
hthe power supply supply voltage V of supply
hwhen the voltage decline is arranged through wire, can be by adjusting variable voltage V
rand the voltage of compensation decline in addition, while when the characteristic decline of transistorized M1-M3 critical voltage difference or Organic Light Emitting Diode 200, causing the display device light and shade uneven, all can see through and adjust variable voltage V
rand the decline of the characteristic of compensation critical voltage or Organic Light Emitting Diode 200.
In the present embodiment, please see Fig. 1, aforementioned the first transistor M1 can be the P transistor npn npn, and second and third transistor M2, M3 are the N-type transistor.Yet the present invention is not as limit, in one embodiment, aforementioned first, second and third transistor M1-M3 also can be all the P transistor npn npn, can optionally configure according to actual demand suitable transistor types.
Operating conditions for the checking foregoing circuit, the embodiment of the present invention adopts the built-in Device Model of Smart-SPICE to be verified driving circuit 100, and the W/L that the parameter that wherein adopted is the first transistor is the V that 50/3.84um (P-type), second and three transistorized W/L are 8 μ m/3.84um (n-type), Cs=2.5pF, the first transistor
tHfor-3, second and three transistorized V
tHbe 1, V
data=0-5V, V
scan=-10-20V, V
r=0-2V, V
h=12V, V
l=0V, wherein W is channel width, L is that passage is long, V
tHfor transistorized critical voltage, V
datafor the data-signal that data line is exported, V
scanfor the sweep signal that sweep trace 300 is exported, V
rfor variable power supply V
rthe variable voltage of exporting, V
hfor power supply V
hthe power supply supply voltage of exporting, V
lfor reference voltage end V
lthe reference voltage of exporting.
Above-mentioned the result please refer to Fig. 3, and it is the checking schematic diagram illustrated according to the pixel-driving circuit of the Organic Light Emitting Diode of Fig. 1 of the present invention.As shown in the figure, after times 30 μ s, each end-point voltage of the first transistor M1 tends towards stability, and is found out source electrode (first end) the voltage V of the first transistor M1 in figure
sbe greater than grid (control end) voltage V
g, and the grid of the first transistor M1 (control end) voltage V
gbe greater than drain electrode (the second end) voltage V
d, because the first transistor M1 is the P transistor npn npn, therefore, above-mentioned electrical situation can make the first transistor M1 in saturation mode, thus, just can guarantee that the driving circuit 100 of the embodiment of the present invention can be by adjusting variable voltage V
r, with the parameter variation of each assembly in compensating circuit, caused drive current I
oLEDthe situation descended, and then improve the problem of display device light and shade inequality.
From the invention described above embodiment, application the present invention has following advantages.The embodiment of the present invention is by a kind of driving circuit is provided, the problem of the display device light and shade inequality produced so as to the characteristic decline improved due to voltage decline, transistorized critical voltage difference and Organic Light Emitting Diode.
Claims (10)
1. the pixel-driving circuit of an Organic Light Emitting Diode, is characterized in that, comprises:
One the first transistor comprises:
One first end, be electrically coupled to a power supply;
One control end; And
One second end, be electrically coupled to an Organic Light Emitting Diode;
One electric capacity comprises:
One first end, be electrically coupled to a first node with this first end of this first transistor; And
One second end, be electrically coupled to a Section Point with this control end of this first transistor;
Wherein in a first period, this power supply is not supplied a power supply supply voltage and is given this first node, and this first node is written into a data voltage, and this Section Point is written into a variable voltage;
Wherein in a second phase, this power supply is for giving this first node by power supply supply voltage, make the voltage of this first node be promoted to this power supply supply voltage, and correspondingly the voltage of this Section Point is raised to this variable voltage and this power supply supply voltage and deduct this data voltage, this first transistor according to the voltage of the voltage of this first node and this two node to provide a drive current to give this Organic Light Emitting Diode.
2. the pixel-driving circuit of Organic Light Emitting Diode as claimed in claim 1, is characterized in that, this variable voltage can be adjusted, to compensate this drive current.
3. the pixel-driving circuit of Organic Light Emitting Diode as claimed in claim 1, is characterized in that, this data voltage can be adjusted, to compensate this drive current.
4. the pixel-driving circuit of Organic Light Emitting Diode as claimed in claim 1, is characterized in that, this drive current is to produce according to following formula:
I wherein
oLEDfor this drive current, K be this first transistor conduction parameter, V
datafor this data voltage, V
rfor this variable voltage, V
tHa critical voltage for this first transistor.
5. the pixel-driving circuit of Organic Light Emitting Diode as claimed in claim 4, is characterized in that, this variable voltage can be adjusted, to compensate this critical voltage of this first transistor.
6. the pixel-driving circuit of Organic Light Emitting Diode as claimed in claim 4, is characterized in that, this data voltage can be adjusted, to compensate this critical voltage of this first transistor.
7. the pixel-driving circuit of Organic Light Emitting Diode as claimed in claim 1, it is characterized in that, this Organic Light Emitting Diode is electrically coupled to a reference voltage end, wherein this reference voltage end is not supplied a reference voltage in this first period and is given this Organic Light Emitting Diode, and this reference voltage end supplied give this Organic Light Emitting Diode by reference voltage in this second phase.
8. the pixel-driving circuit of Organic Light Emitting Diode as claimed in claim 1, is characterized in that, also comprises:
One transistor seconds comprises:
One first end, be electrically coupled to this first node;
One control end, be electrically coupled to the one scan line; And
One second end, be electrically coupled to a data line; And
One the 3rd transistor comprises:
One first end, be electrically coupled to this Section Point;
One control end, be electrically coupled to this sweep trace; And
One second end, be electrically coupled to a variable power supply;
Wherein in this first period, this sweep trace transmits scan voltage this control end and the 3rd transistorized this control end to this transistor seconds, mat makes this transistor seconds open and this first node is write to this data voltage, and the 3rd transistor is opened and this Section Point is write to this variable voltage.
9. the pixel-driving circuit of Organic Light Emitting Diode as claimed in claim 8, is characterized in that, this first transistor is the P transistor npn npn, and this second and third transistor is the N-type transistor.
10. the pixel-driving circuit of Organic Light Emitting Diode as claimed in claim 8, is characterized in that, this first, second and third transistor is all the P transistor npn npn.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013103706661A CN103440845A (en) | 2013-08-23 | 2013-08-23 | Pixel drive circuit of organic light emitting diode |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013103706661A CN103440845A (en) | 2013-08-23 | 2013-08-23 | Pixel drive circuit of organic light emitting diode |
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| Publication Number | Publication Date |
|---|---|
| CN103440845A true CN103440845A (en) | 2013-12-11 |
Family
ID=49694536
Family Applications (1)
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|---|---|---|---|
| CN2013103706661A Pending CN103440845A (en) | 2013-08-23 | 2013-08-23 | Pixel drive circuit of organic light emitting diode |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104064149A (en) * | 2014-07-07 | 2014-09-24 | 深圳市华星光电技术有限公司 | Pixel circuit, display panel with pixel circuit and displayers |
| CN109637443A (en) * | 2019-01-10 | 2019-04-16 | 云谷（固安）科技有限公司 | Pixel compensation circuit and driving method, display device |
| US11282436B2 (en) | 2018-11-29 | 2022-03-22 | Chengdu Vistar Optoelectronics Co., Ltd. | Pixel circuit including a storage device connected to a control line, display device and method for driving pixel circuit |
-
2013
- 2013-08-23 CN CN2013103706661A patent/CN103440845A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104064149A (en) * | 2014-07-07 | 2014-09-24 | 深圳市华星光电技术有限公司 | Pixel circuit, display panel with pixel circuit and displayers |
| US9779658B2 (en) | 2014-07-07 | 2017-10-03 | Shenzhen China Star Optoelectronics Technology Co., Ltd. | Pixel circuit, display panel and display device comprising the pixel circuit |
| US11282436B2 (en) | 2018-11-29 | 2022-03-22 | Chengdu Vistar Optoelectronics Co., Ltd. | Pixel circuit including a storage device connected to a control line, display device and method for driving pixel circuit |
| CN109637443A (en) * | 2019-01-10 | 2019-04-16 | 云谷（固安）科技有限公司 | Pixel compensation circuit and driving method, display device |
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Application publication date: 20131211 |