CN105206222A - Oled pixel compensation circuit and oled pixel driving method - Google Patents
Oled pixel compensation circuit and oled pixel driving method Download PDFInfo
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- CN105206222A CN105206222A CN201410276953.0A CN201410276953A CN105206222A CN 105206222 A CN105206222 A CN 105206222A CN 201410276953 A CN201410276953 A CN 201410276953A CN 105206222 A CN105206222 A CN 105206222A
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Abstract
The invention discloses an OLED pixel compensation circuit and an OLED pixel driving method. The OLED pixel driving method comprises the steps as follows: S1, a reset process: a threshold compensation module clears a threshold voltage and a data voltage stored therein under the control of a second scanning end, and a first power supply charges a compensation capacitor; S2, a compensation process: a first scanning end makes the threshold compensation module receive a signal from a data signal end, the threshold compensation module observes the threshold voltage of a first transistor and uses the observed threshold voltage to compensate the data voltage, and the data voltage after compensation is stored in the compensation capacitor; and S3, a light-emitting display process: a light-emitting control end makes a load driving module receive a driving voltage output by the threshold compensation module, and a driving transistor converts the driving voltage into current for driving an organic light-emitting diode to drive the organic light-emitting diode to emit light. By adopting the method, the influence of change in power voltage of the pixel compensation circuit to the brightness of the organic light-emitting diode can be compensated.
Description
Technical field
The present invention relates to a kind of pixel compensation circuit and image element driving method, espespecially a kind of pixel compensation circuit for OLED display and image element driving method.
Background technology
It is little that OLED display has volume, structure is simple, from main light emission, the advantage such as brightness is high, image quality good, visible angle is large, low in energy consumption and response time is short, thus cause extensive concern, become the display technique of future generation replacing liquid crystal most probably.
Although OLED display has above-mentioned advantage, but in its application process, also extend many problems, such as OLED as switch or driving element the variation meeting different from material aging degree of material behavior of thin film transistor (TFT) (ThinFilmTransistor, TFT) cause the uneven phenomenon of Display panel.OLED can cause OLED aging after using for a long time in addition, can produce with the aging of device the problem that threshold voltage rises, luminescence efficiency declines.
Summary of the invention
The object of the present invention is to provide a kind of OLED pixel compensation circuit and OLED image element driving method, it can compensate the threshold voltage V of different driving transistor
ththe inconsistent problem causing OLED display image uneven.
In order to solve the problem, it comprises to the invention provides a kind of OLED pixel compensation circuit: comprising:
Load driver module and the threshold values compensating module be connected with described load driver module, wherein:
Described load driver module is connected with light emitting control end, described light emitting control end is utilized to control described load driver module for the driving voltage receiving the output of described threshold values compensating module, described load driver module comprises driving transistors, utilizes described driving transistors described driving voltage to be converted to the electric current driving Organic Light Emitting Diode;
Described threshold values compensating module is connected with data signal end, the first scanning end and the second scanning end, utilize described first scanning end to control data voltage that described threshold values compensating module receives described data signal end; Described threshold values compensating module comprises the building-out capacitor being total to the symmetrically arranged the first transistor of grid with described driving transistors and being connected with described the first transistor, described the first transistor is identical with the threshold voltage of described driving transistors, utilize the threshold voltage offset data voltage of described the first transistor and the data voltage after compensating is stored in described building-out capacitor, to be provided as the driving voltage outputting to described load driver module.
The further improvement of OLED pixel compensation circuit of the present invention is: described the first transistor and described driving transistors measure-alike, and described the first transistor and described driving transistors arranged adjacent.
The further improvement of OLED pixel compensation circuit of the present invention is: described threshold values compensating module also comprises transistor seconds and third transistor, and wherein: the first end of described building-out capacitor is connected to the first power supply, its second end is connected to first node; The grid of described the first transistor and drain electrode are connected to described first node, and its source electrode is connected to the drain electrode of described transistor seconds; The grid of described transistor seconds is connected to described first scanning end, and its source electrode is connected to described data signal end; The source electrode of described third transistor is connected to described first node, and its grid is connected to described second scanning end.
The further improvement of OLED pixel compensation circuit of the present invention is: described load driver module also comprises the 4th transistor and the 5th transistor, wherein: the source electrode of described 4th transistor is connected to described first power supply, its grid is connected to described light emitting control end, and its drain electrode is connected to the source electrode of described driving transistors; The grid of described driving transistors is connected to described first node, and its drain electrode is connected to the source electrode of described 5th transistor; The grid of described 5th transistor is connected with described light emitting control end, its drain electrode is connected to the drain electrode of described third transistor, and the anode of described Organic Light Emitting Diode is also connected to the drain electrode of described 5th transistor, and the negative electrode of described Organic Light Emitting Diode is connected to second source.
The further improvement of OLED pixel compensation circuit of the present invention is: described the first transistor, transistor seconds, third transistor, the 4th transistor, the 5th transistor and driving transistors are p channel transistor.
The further improvement of OLED pixel compensation circuit of the present invention is: described first power supply and second source are direct supply, and the voltage that described first power supply exports is greater than the voltage that described second source exports.
The present invention also provides a kind of OLED image element driving method being applicable to above-mentioned OLED pixel compensation circuit, and it comprises the following steps:
S1, reseting procedure: threshold values compensating module removes its threshold voltage stored and data voltage under the control of the second scanning end, and the first power supply charges to building-out capacitor;
S2, compensation process: the first scanning end operation valve value compensating module receives the data voltage of data signal end, simultaneously described threshold values compensating module is observed the threshold voltage of the first transistor and is used the threshold voltage offset data voltage observed, the data voltage after compensation is stored in described building-out capacitor;
S3, luminescence display process: the driving voltage that light emitting control end control load driver module received threshold compensating module exports, described driving voltage is converted to and drives the electric current of Organic Light Emitting Diode to drive thus organic light-emitting diode by described driving transistors.
The present invention also provides a kind of OLED image element driving method being applicable to above-mentioned OLED pixel compensation circuit, and it comprises the following steps:
S1, reseting procedure: now the second scanning end controls third transistor conducting, threshold values compensating module removes its threshold voltage stored and data voltage under the control of the second scanning end, and the first power supply charges to building-out capacitor;
S2, compensation process: the first scanning end controls transistor seconds conducting, the first transistor is diode-connected, now threshold values compensating module receives the data voltage of data signal end, simultaneously threshold values compensating module is observed the threshold voltage of the first transistor and is used the threshold voltage offset data voltage observed, the data voltage after compensation is stored in described building-out capacitor;
S3, luminescence display process: light emitting control end controls the 4th transistor and the 5th transistor turns, transistor seconds and third transistor are in off state, the voltage superposition of building-out capacitor and the first power supply is to the grid of driving transistors, now: the driving voltage that load driver module received threshold compensating module exports, driving voltage is converted to the electric current thus driving organic light-emitting diode that drive Organic Light Emitting Diode by driving transistors.
The further improvement of OLED image element driving method of the present invention is: described Organic Light Emitting Diode is less than the glow current of described Organic Light Emitting Diode at the electric current that described reseting procedure flows through described Organic Light Emitting Diode.
The further improvement of OLED image element driving method of the present invention is: when OLED pixel compensation circuit is in luminescence display process, and the voltage at described building-out capacitor two ends remains unchanged.
Comprise a building-out capacitor in OLED pixel compensation circuit of the present invention, this building-out capacitor can the voltage of memory data signal and the threshold voltage V of driving transistors in compensation process on the one hand
th, the electric current flowing through driving transistors first end and the second end like this in luminescence display process can not be subject to driving transistors threshold voltage V
ththe impact of change.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of OLED pixel compensation circuit of the present invention;
Fig. 2 is the sequential chart of the drive singal of pixel compensation circuit in OLED image element driving method of the present invention;
Fig. 3 is circuit state figure when OLED pixel compensation circuit is in reseting procedure in OLED image element driving method of the present invention;
Fig. 4 is circuit state figure when OLED pixel compensation circuit is in compensation process in OLED image element driving method of the present invention;
Fig. 5 is the circuit state figure that in OLED image element driving method of the present invention, OLED pixel compensation circuit is in luminescence display process.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the present invention is further detailed explanation.
As shown in Figure 1, OLED pixel compensation circuit of the present invention comprises: load driver module 20 and threshold values compensating module 10, wherein:
Load driver module 20 and light emitting control end E
nconnect, light emitting control end E
ncontrol load driver module 20 driving voltage whether hopper value compensating module 10 exports, load driver module 20 comprises driving transistors T
6, driving transistors T
6driving voltage is converted to the electric current driving Organic Light Emitting Diode;
Threshold values compensating module 10 and data signal end D
m, the first scanning end S
nand the second scanning end S
n-1connect, the first scanning end S
ndetermine whether threshold values compensating module 10 receives data signal end D
mdata voltage; Threshold values compensating module 10 comprises the first transistor T
1, the first transistor T
1with driving transistors T
6threshold voltage V
thidentical; Threshold values compensating module 10 is for observation and store the first transistor T
1threshold voltage V
th, and use the threshold voltage V observed
thoffset data voltage; Threshold values compensating module 10 also comprises building-out capacitor C
1, building-out capacitor C
1store the data voltage after compensating, the data voltage after compensation is outputted to described load driver module 20 as driving voltage by threshold values compensation film 10 pieces.
The first transistor T
1with driving transistors T
6measure-alike, and the first transistor T
1with driving transistors T
6adjacent and symmetric offset spread, so the first transistor T
1with driving transistors T
6there is identical threshold voltage V
th.In the present embodiment, pixel compensation circuit comprises: the first transistor T
1, transistor seconds T
2, third transistor T
3, the 4th transistor T
4, the 5th transistor T
5, driving transistors T
6, above-mentioned transistor is P channel thin-film transistor.
As shown in Figure 1, threshold values compensating module 10 comprises described the first transistor T
1, transistor seconds T
2, third transistor T
3and building-out capacitor C
1, wherein: building-out capacitor C
1first end be connected to the first power supply E
lVDD, its second end is connected to first node a; The first transistor T
1grid and drain electrode be connected to described first node a, its source electrode is connected to transistor seconds T
2drain electrode; Transistor seconds T
2grid be connected to the first scanning end S
n, its source electrode is connected to data signal end D
m; Third transistor T
3source electrode be connected to first node a, its grid is connected to the second scanning end S
n-1.
As shown in Figure 1, load driver module comprises the 4th transistor T
4, the 5th transistor T
5and driving transistors T
6, the 4th transistor T
4source electrode be connected to the first power supply E
lVDD, its grid is connected to light emitting control end E
n, its drain electrode is connected to driving transistors T
6source electrode; Driving transistors T
6grid be connected to first node a, its drain electrode is connected to the 5th transistor T
5source electrode; 5th transistor T
5grid and light emitting control end E
nconnect, its drain electrode is connected to third transistor T
3drain electrode, and the anode of Organic Light Emitting Diode is also connected to the 5th transistor T
5drain electrode, the negative electrode of Organic Light Emitting Diode is connected to second source V
sS.
As shown in Figure 1, the first power supply E
lVDDfor positive supply, second source V
sSground connection.Wherein the first power supply E
lVDDand second source V
sSvoltage be direct current.
As shown in Figure 2, the OLED image element driving method of the present embodiment is by the first scanning end S
n, the second scanning end S
n-1and light emitting control end E
ntransistor in control OLED pixel compensation circuit is according to predetermined sequential conducting or shutoff.The method of the present embodiment comprises following three steps:
S1, reseting procedure: t in corresponding diagram 2
1state, the second scanning end S
n-1control third transistor T
3conducting, now threshold values compensating module 10 is at the second scanning end S
n-1control under remove its store threshold voltage V
thand data voltage, the first power supply E
lVDDto building-out capacitor C
1charging;
S2, compensation process: t in corresponding diagram 2
2state, the first scanning end S
ncontrol transistor seconds T
2conducting, the first transistor T
1in diode-connected, now threshold values compensating module 10 receives data signal end D
mdata voltage, simultaneously threshold values compensating module 10 observes the first transistor T
1threshold voltage V
thand use the threshold voltage V observed
thoffset data voltage, the data voltage after compensation is stored in described building-out capacitor C
1in;
S3, luminescence display process: t in corresponding diagram 2
3state, light emitting control end E
ncontrol the 4th transistor T
4with the 5th transistor T
5conducting, transistor seconds T
2and third transistor T
3be in off state, building-out capacitor C
1and the first power supply E
lVDDvoltage superposition to driving transistors T
6grid, now: load driver module 20 received threshold compensating module 10 export driving voltage, driving transistors T
6driving voltage is converted to the electric current thus driving organic light-emitting diode that drive Organic Light Emitting Diode.
As shown in Figures 2 and 3, the first scanning end S when OLED pixel compensation circuit is in reseting procedure
nand light emitting control end E
nfor high level, the second scanning end S
n-1for low level.Now by the first Scanning Section S
ncontrol transistor seconds T
2turn off, by the second scanning end S
n-1the third transistor T controlled
3conducting, by light emitting control end E
nthe 4th transistor T controlled
4with the 5th transistor T
5turn off.
When OLED pixel compensation circuit is in reseting procedure, third transistor T
3be in conducting state, now from the first power supply E
lVDD, building-out capacitor C
1, third transistor T
3, Organic Light Emitting Diode is to second source V
sSbetween formed a path, now the first power supply E
lVDDto building-out capacitor C
1charging, building-out capacitor building-out capacitor C
1charging is until Organic Light Emitting Diode not conducting always.Because the electric current flowing through Organic Light Emitting Diode is in this process less than the glow current needed for organic light emitting diode, so now Organic Light Emitting Diode can not be luminous.
As shown in Figure 2 and Figure 4, the second scanning end S when OLED pixel compensation circuit is in compensation process
n-1and light emitting control end E
nfor high level, the first scanning end S
nfor low level.Now by the first Scanning Section S
ncontrol transistor seconds T
2conducting, by the second scanning end S
n-1the third transistor T controlled
3turn off, by light emitting control end E
nthe 4th transistor T controlled
4with the 5th transistor T
5turn off.When switching from reseting procedure to compensation process, first scans S
nend and the second scanning end S
n-1voltage different time be low level.
When OLED pixel compensation circuit is in the state of compensation process, due to transistor seconds T
2conducting, third transistor T
3turn off, now the first transistor T
1be in diode-connected, so-called diode-connected is exactly the first transistor T
1grid and drain electrode short circuit.Due to the first transistor T
1with driving transistors T
6measure-alike, so the first transistor T
1with driving transistors T
6threshold voltage V
thidentical.Now at the first power supply E
lVDD, building-out capacitor C
1, the first transistor T
1, transistor seconds T
2and data signal end D
mbetween formed a current path.Now building-out capacitor C
1by the first power supply E
lVDDwith data signal end D
melectric discharge, flows through the electric current of above-mentioned current path with building-out capacitor C
1both end voltage U
creduction and reduce.The turn-on condition of above-mentioned current path is: the D of data signal end
mthe first transistor T is greater than with the electric potential difference of first node a
1threshold voltage V
th.Building-out capacitor C
1along above-mentioned current path electric discharge until the first transistor T
1till not conducting.In sum, building-out capacitor C
1the voltage U of first node when having discharged
a=U
dm-V
th.So far threshold values compensating module 10 observes the first transistor T
1threshold voltage V
thand use the threshold voltage V observed
thoffset data voltage, the data voltage after compensation is stored in building-out capacitor C
1in;
As shown in Figure 2 and Figure 5, the first scanning end S when OLED pixel compensation circuit is in luminescence display process
nand the second scanning end S
n-1for high level, light emitting control end E
nfor low level.Now by the first scanning end S
ncontrol transistor seconds T
2turn off, by the second scanning end S
n-1the third transistor T controlled
3turn off, by light emitting control end E
nthe 4th transistor T controlled
4with the 5th transistor T
5conducting.
When OLED pixel compensation circuit is in luminescence display state, due to the 4th transistor T
4and the 5th transistor T
5conducting and building-out capacitor C
1on voltage and the first power supply E
lVDDvoltage superposition to driving transistors T
6grid, in OLED pixel compensation circuit formed a path: from the first power supply E
lVDD, the 4th transistor T
4, driving transistors T
6, the 5th transistor T
5, Organic Light Emitting Diode is to second source V
sS; For this path, if driving transistors T
6grid voltage U
adriving transistors T is greater than with the voltage difference of its source electrode
6threshold voltage V
thtime driving transistors T
6conducting.Due to now Organic Light Emitting Diode OLED and driving transistors T
6serial connection, so the electric current flowing through OLED OLED equals to flow through driving transistors T
6electric current.In sum, as driving transistors T
6the electric current of OLED OLED and the voltage U of first node a is flow through during conducting
ameet following relation:
I
oLED=0.5 μ
pc
oX(W/L) (U
lVDD-U
a-V
th)
2(formula 1.1)
Be connected to driving transistors T in addition
6the building-out capacitor C of grid
1and the first power supply E
lVDDvoltage superposition to first node a, draw the voltage U at first node a place thus
a:
U
a=U
dm-V
th(formula 1.2)
Bring formula 1.2 into formula 1.1 can obtain:
I
oLED=0.5 μ
pc
oX(W/L) (U
lVDD-U
dm)
2(formula 1.3)
From the known electric current I flowing through Organic Light Emitting Diode OLED of formula 1.3
oLEDonly and the voltage U of data signal end
dmand supply voltage U
lVDDabout and driving transistors T
6threshold voltage V
thirrelevant, and the brightness of Organic Light Emitting Diode OLED is by the electric current I flowing through Organic Light Emitting Diode OLED
oLEDdetermine, so by driving transistors T can be eliminated after the compensation of OLED pixel compensation circuit of the present invention
6threshold voltage V
therror on the impact of OLED OLED.
Below embodiment is to invention has been detailed description by reference to the accompanying drawings, and those skilled in the art can make many variations example to the present invention according to the above description.Thus, some details in embodiment should not form limitation of the invention, the present invention by the scope that defines using appended claims as protection scope of the present invention.
Claims (10)
1. an OLED pixel compensation circuit, for driving Organic Light Emitting Diode, is characterized in that, comprising: load driver module and the threshold values compensating module be connected with described load driver module, wherein:
Described load driver module is connected with light emitting control end, described light emitting control end is utilized to control described load driver module for the driving voltage receiving the output of described threshold values compensating module, described load driver module comprises driving transistors, utilizes described driving transistors described driving voltage to be converted to the electric current driving Organic Light Emitting Diode;
Described threshold values compensating module is connected with data signal end, the first scanning end and the second scanning end, utilize described first scanning end to control data voltage that described threshold values compensating module receives described data signal end; Described threshold values compensating module comprises the building-out capacitor being total to the symmetrically arranged the first transistor of grid with described driving transistors and being connected with described the first transistor, described the first transistor is identical with the threshold voltage of described driving transistors, utilize the threshold voltage offset data voltage of described the first transistor and the data voltage after compensating is stored in described building-out capacitor, to be provided as the driving voltage outputting to described load driver module.
2. OLED pixel compensation circuit as claimed in claim 1, is characterized in that: described the first transistor and described driving transistors measure-alike, and described the first transistor and described driving transistors arranged adjacent.
3. OLED pixel compensation circuit as claimed in claim 1 or 2, it is characterized in that: described threshold values compensating module also comprises transistor seconds and third transistor, wherein: the first end of described building-out capacitor is connected to the first power supply, its second end is connected to first node; The grid of described the first transistor and drain electrode are connected to described first node, and its source electrode is connected to the drain electrode of described transistor seconds; The grid of described transistor seconds is connected to described first scanning end, and its source electrode is connected to described data signal end; The source electrode of described third transistor is connected to described first node, and its grid is connected to described second scanning end.
4. OLED pixel compensation circuit as claimed in claim 3, it is characterized in that: described load driver module also comprises the 4th transistor and the 5th transistor, wherein: the source electrode of described 4th transistor is connected to described first power supply, its grid is connected to described light emitting control end, and its drain electrode is connected to the source electrode of described driving transistors; The grid of described driving transistors is connected to described first node, and its drain electrode is connected to the source electrode of described 5th transistor; The grid of described 5th transistor is connected with described light emitting control end, its drain electrode is connected to the drain electrode of described third transistor, and the anode of described Organic Light Emitting Diode is also connected to the drain electrode of described 5th transistor, and the negative electrode of described Organic Light Emitting Diode is connected to second source.
5. OLED pixel compensation circuit as claimed in claim 4, is characterized in that: described the first transistor, transistor seconds, third transistor, the 4th transistor, the 5th transistor and driving transistors are p channel transistor.
6. OLED pixel compensation circuit as claimed in claim 4, is characterized in that: described first power supply and second source are direct supply, and the voltage that described first power supply exports is greater than the voltage that described second source exports.
7. be applicable to an OLED image element driving method for OLED pixel compensation circuit as claimed in claim 1, it is characterized in that comprising the following steps:
S1, reseting procedure: threshold values compensating module removes its threshold voltage stored and data voltage under the control of the second scanning end, and the first power supply charges to building-out capacitor;
S2, compensation process: the first scanning end operation valve value compensating module receives the data voltage of data signal end, simultaneously described threshold values compensating module is observed the threshold voltage of the first transistor and is used the threshold voltage offset data voltage observed, the data voltage after compensation is stored in described building-out capacitor;
S3, luminescence display process: the driving voltage that light emitting control end control load driver module received threshold compensating module exports, described driving voltage is converted to and drives the electric current of Organic Light Emitting Diode to drive thus organic light-emitting diode by described driving transistors.
8. be applicable to an OLED image element driving method for OLED pixel compensation circuit as claimed in claim 4, it is characterized in that comprising the following steps:
S1, reseting procedure: now the second scanning end controls third transistor conducting, threshold values compensating module removes its threshold voltage stored and data voltage under the control of the second scanning end, and the first power supply charges to building-out capacitor;
S2, compensation process: the first scanning end controls transistor seconds conducting, the first transistor is diode-connected, now threshold values compensating module receives the data voltage of data signal end, simultaneously threshold values compensating module is observed the threshold voltage of the first transistor and is used the threshold voltage offset data voltage observed, the data voltage after compensation is stored in described building-out capacitor;
S3, luminescence display process: light emitting control end controls the 4th transistor and the 5th transistor turns, transistor seconds and third transistor are in off state, the voltage superposition of building-out capacitor and the first power supply is to the grid of driving transistors, now: the driving voltage that load driver module received threshold compensating module exports, driving voltage is converted to the electric current thus driving organic light-emitting diode that drive Organic Light Emitting Diode by driving transistors.
9. OLED image element driving method as claimed in claim 8, is characterized in that: described Organic Light Emitting Diode is less than the glow current of described Organic Light Emitting Diode at the electric current that described reseting procedure flows through described Organic Light Emitting Diode.
10. OLED image element driving method as claimed in claim 8, it is characterized in that: when OLED pixel compensation circuit is in luminescence display process, the voltage at described building-out capacitor two ends remains unchanged.
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| CN107038992A (en) * | 2017-05-23 | 2017-08-11 | 上海和辉光电有限公司 | A kind of image element circuit, driving method and display |
| CN107068045A (en) * | 2017-05-23 | 2017-08-18 | 上海和辉光电有限公司 | A kind of image element circuit, driving method and display |
| CN107068066A (en) * | 2017-06-22 | 2017-08-18 | 京东方科技集团股份有限公司 | Pixel compensation circuit and display device, driving method |
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| CN110992891A (en) * | 2019-12-25 | 2020-04-10 | 昆山国显光电有限公司 | Pixel driving circuit, driving method and display substrate |
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Address after: 201506, No. nine, No. 1568, Jinshan Industrial Zone, Shanghai, Jinshan District Patentee after: Shanghai Hehui optoelectronic Co., Ltd Address before: 201508, building two, building 100, 1, Jinshan Industrial Road, 208, Shanghai, Jinshan District Patentee before: EverDisplay Optronics (Shanghai) Ltd. |