CN105139799A - AMOLED display pixel point driving circuit and method - Google Patents
AMOLED display pixel point driving circuit and method Download PDFInfo
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- CN105139799A CN105139799A CN201510360543.9A CN201510360543A CN105139799A CN 105139799 A CN105139799 A CN 105139799A CN 201510360543 A CN201510360543 A CN 201510360543A CN 105139799 A CN105139799 A CN 105139799A
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Abstract
The invention discloses an AMOLED display pixel point driving circuit and method, and relates to the field of display technology. The circuit comprises an internal AMOLED pixel point circuit and an external AMOLED pixel point circuit, wherein the internal AMOLED pixel point circuit comprises transistors T1, T2, T3, T4, T5 and T6, a capacitor CS and an OLED; and via data input and image current negative feedback effects, the external AMOLED pixel point circuit provides self-regulation driving voltage for the transistors in the internal AMOLED pixel point circuit, and further to obtain the driving current of the OLED. The circuit in the invention can effectively improve the light-emitting uniformity and consistency as well as the response speed of the AMOLED array pixel points, and realize linear gray scale display.
Description
Technical field
The present invention relates to display technique field, more specifically relate to a kind of AMOLED display pixel point driving circuit and driving method thereof.
Background technology
Organic Light Emitting Diode (OrganicLight-EmittingDiode, be called for short: OLED) show flourishing prospect, compared to liquid crystal display, OLED display has that autoluminescence, visible angle are large, fast response time, the characteristic that lightweight, thickness is thin, structure is simple, cost is low.
OLED display pixel point type of drive has two kinds: passive organic LED array (PassiveMatrixOrganicLightEmittingDiode be called for short: PMOLED) and active organic LED array (ActiveMatrixOrganicLightEmittingDiode abbreviation: AMOLED).AMOLED compares PMOLED and has the following advantages: drive current little, the whole cycle is luminous, the life-span is long, so AMOLED is more suitable for the display driver of high resolving power, high refreshing frequency and large scale screen.
OLED belongs to current drive-type device, and as shown in Figure 1, traditional AMOLED driving circuit is made up of (being called for short 2T1C structure) two transistors and an electric capacity.Can by data input voltage signal V in data write cycle
dATA, in data hold period, obtain continued for constant electric current I
oLEDrealize OLED to drive, this structure can not compensate TFT and OLED characteristic deviation problem, and gray scale unevenness is very high, therefore needs to compensate.
At present, compensation technique is mainly divided into two kinds: voltage compensation and current mode compensate.Voltage compensation common practice is by switching transistor State Transferring, and allow and drive electric capacity storage transistor threshold voltage correlative and driving voltage superposition, to eliminate the impact of transistor threshold voltage, its data input signal is voltage signal.Current mode compensates and is respectively current mirror compensation and non-current mirror compensation, and its data input signal is current signal, and common practice is the electric current I making to flow through OLED display pixel point
oLEDequal with data input current signal.Charge flow transistor characteristic deviation compensation effect is better than voltage compensation, and its shortcoming drives capacitor charging time long, the response time of increasing circuit.On this basis, Ashtiani and ArokiaNathan is at " Adrivingschemeforactive-matrixorganiclight-emittingdiode displaysbasedonfeedback [J] .DisplayTechnology, Journalof, 2006, 2 (3): 258-264. " Novel pixel point external feedback compensating circuit is proposed in, as shown in Figure 2, in this pixel, circuit is by pixel external circuit input data voltage signal, in pixel, circuital current passes through feedback regulation, be supplied to the driving voltage driving electric capacity suitable, can compensation transistor characteristic deviation, but its shortcoming is that the response time is oversize.LiuW and YaoG etc. propose modified feedback compensation circuit in " LiuW; YaoG; JiangC; etal.ANewVoltageDrivingSchemetoSuppressNon-IdealitiesofP olycrystallineThin-FilmTransistorsforAMOLEDDisplays [J] .JournalofDisplayTechnology; 2014; 10 (12): 991-994. ", as shown in Figure 3, can compensation transistor characteristic deviation affect equally, but its shortcoming to compensate OLED characteristic deviation.
Inventor finds that in prior art, AMOLED display pixel point driving circuit still has following problem:
(1) for obtaining good AMOLED display pixel point transistor threshold compensation characteristic, current mode compensates and is better than voltage compensation, but it is longer that current mode compensates the response time, and this can not meet the response time requirement of large scale screen, high resolving power and high refreshing frequency;
(2) existing compensation technique concentrates on AMOLED display pixel point driving circuit transistor characteristic migration, and ignore OLED characteristic deviation and compensate, between OLED pixel, fabrication error and OLED pixel are degenerated in time and caused each pixel OLED characteristic different;
(3) the data input voltage signal V of existing AMOLED display pixel point driving circuit
dATAwith output current I
oLEDnot linear relationship, be unfavorable for that gray scale regulates.
Summary of the invention
The present invention is for overcoming above-mentioned deficiency of the prior art, provide a kind of AMOLED display pixel point driving circuit and driving method thereof, the comparatively fast-response of AMOLED display pixel point driving circuit, transistor characteristic migration can be realized, OLED characteristic deviation compensates and linear gradation shows.
The present invention is achieved through the following technical solutions above-mentioned purpose.
A kind of AMOLED display pixel point driving circuit, comprises two parts: circuit and AMOLED pixel external circuit in AMOLED pixel; Wherein in AMOLED pixel, circuit comprises: transistor T1, transistor T2, transistor T3, transistor T4, transistor T5, transistor T6, electric capacity C
sand OLED;
Wherein the grid of transistor T5 is connected with the grid of transistor T6,
The source class of transistor T5 is connected with the output terminal of AMOLED pixel external circuit,
The drain electrode of transistor T5 is connected with the grid of transistor T1,
The source class of transistor T6 is connected with the input end of AMOLED pixel external circuit,
The drain electrode of transistor T6 is connected with the drain electrode of transistor T4,
The grid of transistor T1 is connected with the grid of transistor T2,
The source class of transistor T1 and the first power supply V
dDbe connected,
The drain electrode of transistor T1 is connected with the source class of transistor T3,
The source class of transistor T2 and the first power supply V
dDbe connected,
The drain electrode of transistor T2 is connected with the source class of transistor T4,
Electric capacity C
stwo ends connect the first power supply V respectively
dDwith the grid of transistor T1,
The grid of transistor T3 is connected with the grid of transistor T4,
The grid of transistor T3 is connected with drain electrode,
The positive pole of OLED is connected with the drain electrode of transistor T3,
The negative pole of OLED and second source V
sSbe connected.
AMOLED pixel external circuit is by data input voltage signal V
dATAwith image current I
fBnegative feedback, provides the self-regulation driving voltage V of transistor T1 and transistor T2 in circuit in AMOLED pixel
g, thus obtain the drive current I of OLED
oLED.
Above-mentioned AMOLED pixel external circuit comprises current sample module and integration module; Wherein two input ends of current sample module connect source class and the data input voltage signal V of above-mentioned transistor T6 respectively
dATA, the input end of integration module connects the output terminal of current sample module, and the output terminal of integration module is connected with the source class of above-mentioned transistor T5.
Above-mentioned transistor is thin film transistor (TFT) or field effect transistor.
A driving method for AMOLED display pixel point driving circuit, comprises above-mentioned AMOLED display pixel point driving circuit;
During display data writing pattern, transistor T5 and transistor T6 is strobed, and AMOLED pixel external circuit is by data input voltage signal V
dATAwith image current I
fBnegative feedback, provides the transistor T1 in AMOLED pixel in circuit and transistor T2 self-regulation driving voltage V
g, thus obtain OLED drive current I
oLED;
During display keeping data mode, transistor T5 and transistor T6 is closed, electric capacity C
sthere is no discharge loop, the driving voltage V of transistor
gremain unchanged, the drive current I of OLED
oLEDremain unchanged, pixel gray scale is constant.
Above-mentioned data input voltage signal V
dATAcan be obtained by digital-to-analog conversion.
Above-mentioned transistor T3 and transistor T4 is for keeping the drain voltage of transistor T1 and transistor T2 equal, and transistor T1 and transistor T2 is mirror-image structure, makes the electric current flowing through transistor T1 and transistor T2 equal.
Above-mentioned driving circuit and driving method are also applicable to the display of other active illuminating, and such as a kind of LED display pixel point driving circuit is that the OLED in circuit in above-mentioned AMOLED pixel is replaced with LED.
The present invention compared with prior art mainly has following beneficial effect: achieve transistor characteristic migration, obtain the response time faster on this basis; Achieve and OLED characteristic deviation is compensated; The data input voltage signal V of AMOLED display pixel point driving circuit
dATAlinear with output current, achieve linear gradation display.
Accompanying drawing explanation
Fig. 1 is the AMOLED display pixel point driving circuit figure of tradition " 2T1C structure ".
Fig. 2 is the AMOLED display pixel point driving circuit figure that Ashtiani and ArokiaNathan proposes.
Fig. 3 is the AMOLED display pixel point driving circuit figure that LiuW and YaoG etc. proposes.
Fig. 4 is the AMOLED display pixel point driving circuit figure in the embodiment of the present invention.
Fig. 5 is the AMOLED display pixel point driving circuit figure comprising AMOLED pixel external circuit figure in the embodiment of the present invention.
Fig. 6 is the signal timing diagram of driving method in the embodiment of the present invention.
Fig. 7 is data input voltage signal V in the embodiment of the present invention
dATAwith output current I
oLEDlinear relationship chart.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described.Accompanying drawing, only for exemplary illustration, can not be interpreted as the restriction to this patent.
In order to more succinct explanation the present embodiment, in accompanying drawing or explanation, some well known to a person skilled in the art but can omit to some extent with the incoherent parts of the main contents of the invention.In addition for ease of statement, in accompanying drawing, some parts has omission, zooms in or out, but does not represent size or the entire infrastructure of actual product.
Embodiment:
The present embodiment illustrates AMOLED display pixel point driving circuit.
As shown in Figure 4, a kind of AMOLED display pixel point driving circuit, comprises two parts: circuit and AMOLED pixel external circuit in AMOLED pixel.
In AMOLED pixel, circuit comprises: the first transistor T1, transistor seconds T2, third transistor T3, the 4th transistor T4, the 5th transistor T5, the 6th transistor T6, electric capacity C
sand OLED.
Wherein the grid of the 5th transistor T5 is connected with the grid of the 6th transistor T6,
The source class of the 5th transistor T5 is connected with the output terminal of AMOLED pixel external circuit,
The drain electrode of the 5th transistor T5 is connected with the grid of the first transistor T1,
The source class of the 6th transistor T6 is connected with the input end of AMOLED pixel external circuit,
The drain electrode of the 6th transistor T6 is connected with the drain electrode of the 4th transistor T4,
The grid of the first transistor T1 is connected with the grid of transistor seconds T2,
The source class of the first transistor T1 and the first power supply V
dDbe connected,
The drain electrode of the first transistor T1 is connected with the source class of third transistor T3,
The source class of transistor seconds T2 and the first power supply V
dDbe connected,
The drain electrode of transistor seconds T2 is connected with the source class of the 4th transistor T4,
Electric capacity C
stwo ends connect the first power supply V respectively
dDwith the grid of the first transistor T1,
The grid of third transistor T3 is connected with the grid of the 4th transistor T4,
The grid of third transistor T3 is connected with drain electrode,
The positive pole of OLED is connected with the drain electrode of third transistor T3,
The negative pole of OLED and and second source V
sSbe connected.
Transistor in the present embodiment is thin film transistor (TFT) or field effect transistor.
AMOLED pixel external circuit is by data input voltage signal V
dATAwith image current I
fBnegative feedback, provides the transistor drive voltage in circuit in AMOLED pixel.
As shown in Figure 5, the AMOLED pixel external circuit in the present embodiment comprises current sample module and integration module; Wherein two input ends of current sample module connect source class and the data input voltage signal V of the 6th transistor T6 respectively
dATA, the input end of integration module connects the output terminal of current sample module, and the output terminal of integration module is connected with the source class of the 5th transistor T5.
As shown in Figure 6, be the signal timing diagram of driving method of above-mentioned AMOLED display pixel point driving circuit.
During display data writing pattern, row selects control signal V
sELfor low level, the 5th transistor T5 and the 6th transistor T6 is strobed, by transistor saturation current formula:
Under same technique, the first transistor T1 and transistor seconds T2 selects the wide W of identical raceway groove and the long L of raceway groove, the source electrode of the first transistor T1 and grid link together with the source electrode of transistor seconds T2 and grid respectively, i.e. the gate source voltage V of the first transistor T1 and transistor seconds T2
gSequal, the threshold voltage V of the first transistor T1 and transistor seconds T2
tHequal, so the electric current I that the first transistor T1 drains
t1with the electric current I that transistor seconds T2 drains
t2ratio can abbreviation be:
From above formula, V
dS_T1with V
dS_T2equal guarantee I
t1and I
t2equal.Circuit adds third transistor T3 and the 4th transistor T4 for this reason, and when selecting third transistor T3 and the 4th transistor T4 parameter, both requirements have the wide W of identical raceway groove and the long L of raceway groove, thus draw:
Third transistor T3 and the 4th transistor T4 is grid altogether, this guarantees:
Above formula can release V
d_T1with V
d_T2equal, thus:
Combined circuit Fig. 4 and above formula obtain:
Thus known, I
fBand I
oLEDbe image current relation, and do not affect by channel-length modulation.
Current sample module output voltage V
fBfor:
Wherein G is the gain of operational amplifier;
Integration module output voltage V
oUTfor;
Wherein, V
oUT(t
1) be V
oUTat start time t
1value, V
oUT(t
2) be V
oUTat end time t
2value;
From above formula, V
oUTto electric capacity C
scontinue charging, control the grid voltage V of the first transistor T1 and transistor seconds T2 like this
g, thus control feedback current I
fB, feedback current I
fBaffect V again
oUTchange.This network is degeneration factor, feedback current I
fBwhen degeneration factor steady state (SS):
Due to I
oLEDand I
fBimage current relation, namely under stable condition:
From above formula, data input voltage signal V
dATAwith OLED electric current I
oLEDbe linear relationship, Fig. 7 gives linear graph and the linearity.
During display keeping data mode, row selects control signal V
sELfor high level, the 5th transistor T5 and the 6th transistor T6 is closed, electric capacity C
sthere is no discharge loop, the first transistor T1 and transistor seconds T2 grid voltage V
gremain unchanged, thus keep OLED drive current I
oLEDconstant, so OLED pixel gray scale during Holdover mode is constant.
From display data writing pattern and the display keeping data mode course of work:
(1) under stable condition, the drive current I of OLED
oLEDonly by data input voltage signal V
dATAwith feedback resistance R
fBimpact, transistor characteristic skew can not to the drive current I of OLED
oLEDproduce and change, so this circuit can compensation transistor characteristic deviation.AMOLED pixel external circuit exports as voltage signal V
oUT, drastically increase electric capacity C
sthe discharge and recharge time, therefore obtain the response time faster;
(2) under stable condition, the drive current I of OLED
oLEDonly by data input voltage signal V
dATAwith feedback resistance R
fBimpact, OLED characteristic deviation can not to the drive current I of OLED
oLEDproduce and change, so this circuit can compensate OLED characteristic deviation;
(3) the data input voltage signal V of AMOLED display pixel point driving circuit
dATAwith output current I
oLEDlinear, slope is 1/R
fB, achieve linear gradation display.
Above-described embodiment is only the present invention's preferably embodiment; but embodiments of the present invention are not restricted to the described embodiments; other are any do not deviate from Spirit Essence of the present invention and principle under do change, modification, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
AMOLED display pixel point driving circuit in the present embodiment is the one typical case of AMOLED display pixel point driving circuit, other type display pixel point driving circuit (as changed the OLED in circuit in AMOLED pixel into LED), when not deviating from Spirit Essence of the present invention and circuit theory, can realize transistor characteristic migration, obtain the response time faster, realize linear gradation display.
Claims (7)
1. an AMOLED display pixel point driving circuit, is characterized in that, this driving circuit comprises two parts: circuit and AMOLED pixel external circuit in AMOLED pixel; In AMOLED pixel, circuit comprises: transistor T1, transistor T2, transistor T3, transistor T4, transistor T5, transistor T6, electric capacity C
sand OLED;
Wherein the grid of transistor T5 is connected with the grid of transistor T6,
The source class of transistor T5 is connected with the output terminal of AMOLED pixel external circuit,
The drain electrode of transistor T5 is connected with the grid of transistor T1,
The source class of transistor T6 is connected with the input end of AMOLED pixel external circuit,
The drain electrode of transistor T6 is connected with the drain electrode of transistor T4,
The grid of transistor T1 is connected with the grid of transistor T2,
The source class of transistor T1 and the first power supply V
dDbe connected,
The drain electrode of transistor T1 is connected with the source class of transistor T3,
The source class of transistor T2 and the first power supply V
dDbe connected,
The drain electrode of transistor T2 is connected with the source class of transistor T4,
Electric capacity C
stwo ends connect the first power supply V respectively
dDwith the grid of transistor T1,
The grid of transistor T3 is connected with the grid of transistor T4,
The grid of transistor T3 is connected with drain electrode,
The positive pole of OLED is connected with the drain electrode of transistor T3,
The negative pole of OLED and and second source V
sSbe connected;
AMOLED pixel external circuit, by data input and image current negative feedback, provides the self-regulation driving voltage V of transistor T1 and transistor T2 in AMOLED pixel
g, thus obtain OLED drive current I
oLED.
2. AMOLED display pixel point driving circuit according to claim 1, is characterized in that, described AMOLED pixel external circuit comprises current sample module and integration module; Wherein two input ends of current sample module connect source class and the data input voltage signal V of described transistor T6 respectively
dATA, the input end of integration module connects the output terminal of current sample module, and the output terminal of integration module is connected with the source class of described transistor T5.
3. AMOLED display pixel point driving circuit according to claim 1, it is characterized in that, described transistor is thin film transistor (TFT) or field effect transistor.
4. a driving method for AMOLED display pixel point driving circuit, is characterized in that, comprises the AMOLED display pixel point driving circuit according to any one of claims 1 to 3;
During display data writing pattern, transistor T5 and transistor T6 is strobed, and AMOLED pixel external circuit is by data input voltage signal V
dATAwith image current I
fBnegative feedback, provides the transistor T1 in AMOLED pixel in circuit and transistor T2 self-regulation driving voltage V
g, thus obtain OLED drive current I
oLED;
During display keeping data mode, transistor T5 and transistor T6 is closed, electric capacity C
sthere is no discharge loop, the driving voltage V of transistor
gremain unchanged, the drive current I of OLED
oLEDremain unchanged, pixel gray scale is constant.
5. the driving method of AMOLED display pixel point driving circuit according to claim 4, is characterized in that, described data input voltage signal V
dATAobtained by digital-to-analog conversion.
6. the driving method of AMOLED display pixel point driving circuit according to claim 4, it is characterized in that, described transistor T3 and transistor T4 is for keeping the drain voltage of transistor T1 and transistor T2 equal, transistor T1 and transistor T2 is mirror-image structure, makes the electric current flowing through transistor T1 and transistor T2 equal.
7. a LED display pixel point driving circuit, is characterized in that, the OLED in the AMOLED pixel according to any one of claims 1 to 3 in circuit replaces with LED.
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| US20230028085A1 (en) * | 2020-04-02 | 2023-01-26 | Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd. | Pixel driving circuit and display panel |
| US11735096B2 (en) * | 2020-04-02 | 2023-08-22 | Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd. | Pixel driving circuit including control unit to measure voltage difference between opposite ends of sampling resistor, and display panel including the same |
| WO2021249137A1 (en) * | 2020-06-11 | 2021-12-16 | 京东方科技集团股份有限公司 | Display driving circuit, driving method therefor, and display device |
| US11875742B2 (en) | 2020-06-11 | 2024-01-16 | Beijing Boe Display Technology Co., Ltd. | Display drive circuit and drive method thereof, and display device |
| CN114974116A (en) * | 2022-05-31 | 2022-08-30 | 惠科股份有限公司 | Pixel driving circuit and pixel driving method |
| CN117238241A (en) * | 2023-11-15 | 2023-12-15 | 中科(深圳)无线半导体有限公司 | Micro LED current type driving circuit and implementation method thereof |
| CN117238241B (en) * | 2023-11-15 | 2024-02-23 | 中科(深圳)无线半导体有限公司 | Micro LED current type driving circuit and implementation method thereof |
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