CN106328060B - A kind of drift compensation method of AMOLED panel and the panel pixel driving circuit - Google Patents
A kind of drift compensation method of AMOLED panel and the panel pixel driving circuit Download PDFInfo
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- CN106328060B CN106328060B CN201610810654.XA CN201610810654A CN106328060B CN 106328060 B CN106328060 B CN 106328060B CN 201610810654 A CN201610810654 A CN 201610810654A CN 106328060 B CN106328060 B CN 106328060B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
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- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Electroluminescent Light Sources (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
Present applicant proposes a kind of AMOLED panel and the drift compensation methods of the panel pixel driving circuit, are related to a kind of brightness regulation technology of AMOLED panel.Pixel-driving circuit of the invention；Drift compensating circuit comprising: OLED current monitoring unit is used to monitor the size of current for flowing through panel itself OLED；Offset voltage computing unit, it connects the OLED current monitoring unit, the size of current of OLED for being obtained according to the OLED current monitoring unit calculates offset voltage, and offset voltage is supplied to the driving transistor in the pixel-driving circuit, to compensate the voltage drift of the driving transistor.Have the beneficial effect that structure is simple, the drift value of thermal compensation signal voltage is small, and thermal compensation signal is more stable.
Description
Technical field
The present invention relates to a kind of brightness regulation technologies of active matrix organic light-emitting diode.
Background technique
Display technology of the AMOLED as a new generation, with low-power consumption, high colour gamut, high brightness, high-resolution, wide viewing angle
And the advantages of high response speed, therefore, favor of the AMOLED panel by market.
In Thin Film Transistor-LCD, brightness is by voltage-controlled, as long as by the precision controlling of pixel voltage
To several millivolts, so that it may the inhomogeneities of brightness is limited in required ± 1% range, this is easy to reach, because
In Thin Film Transistor-LCD, pixel thin film transistor does not need to be transmitted voltage signal transformation, it is only necessary to will
Voltage signal is directly transmitted to the switch in pixel from data line.And in AMOLED, brightness is by flowing through OLED current
Control, the inhomogeneities of brightness is remained that in required ± 1% range, this means that requirement by AMOLED panel
Current control in ± 1% range.Since most of existing semiconductor element product circuit all transmits voltage signal, without
It is current signal, so being stored in current signal after current signal must being converted by the voltage signal of AMOLED panel
In one frame pixel period of AMOLED panel, however this process is difficult to complete.Since the low temperature polycrystalline silicon of AMOLED panel is thin
The threshold voltage and channel mobility of film transistor in spatial distribution be it is non-uniform, lead to the amorphous silicon membrane of AMOLED panel
The threshold voltage and channel mobility of transistor can deviate at any time, these disadvantages can all cause the inhomogeneities of brightness of display screen
And unstability.
Existing AMOLED panel driving circuit is 2T1C AMOLED panel driving circuit, is as shown in Figure 1 existing
AMOLED panel driving circuit；The grid of first film transistor 1 is connected with line n gated sweep signal wire, and the first film is brilliant
The source electrode of body pipe 1 is connected with the n-th column communication signal line, the drain electrode of first film transistor 1 simultaneously with one end of storage capacitance 3 and
The grid of second thin film transistor (TFT) 2 is connected；The other end of storage capacitance 3 is grounded；The source electrode and OLED of second thin film transistor (TFT) 2 drive
Moving-wire is connected, and the drain electrode of the second thin film transistor (TFT) 2 is connected with the anode of OLED4, the minus earth of OLED4；Wherein, the first film
Transistor 1 is the switch for controlling the charging of storage capacitance 3, and the second thin film transistor (TFT) 2 is driving transistor, the second film crystal
Pipe 2 is for driving OLED4, and storage capacitance 3 is used to store the signal gray scale voltage of the n-th column communication signal line and then control second is thin
Driving current of the film transistor 2 to OLED4；It includes two stages, the first rank that 2T1CAMOLED panel drive circuit, which drives process,
Section is the charging stage of storage capacitance 3, as shown in Fig. 2, the charging voltage of storage capacitance 3 is Vdt in the first stage；Second stage
For the light emitting phase of OLED4, as shown in figure 3, being I in the electric current that second stage flows through OLED4；It is described to be flowed through in second stage
The electric current I=K*Vdd-Vth/2 of OLED4；Wherein, K is constant, and the value of K depends on the channel dimensions of the second thin film transistor (TFT) 2,
The dielectric constant and semiconductor mobility of 2 gate insulating layer of the second thin film transistor (TFT) are depended on, Vdd is that OLED drives line
Voltage value, Vth are the threshold voltage of the second thin film transistor (TFT) 2；Because there is drift in the threshold voltage Vth of the second thin film transistor (TFT) 2
It moves, causes to drive effect poor.
Summary of the invention
For above-mentioned the problems of the prior art, present applicant proposes a kind of AMOLED panel and panel pixel driving electricity
The drift compensation method on road.
A kind of AMOLED panel of the present invention, pixel-driving circuit；
Drift compensating circuit comprising:
OLED current monitoring unit is used to monitor the size of current for flowing through panel itself OLED；
Offset voltage computing unit connects the OLED current monitoring unit, for being monitored according to the OLED current
The size of current for the OLED that unit obtains calculates offset voltage, and offset voltage is supplied to the drive in the pixel-driving circuit
Dynamic transistor, to compensate the voltage drift of the driving transistor.
According to one embodiment of present invention, the OLED current monitoring unit flows through dummy outside panel by measurement
The size of current of OLED determines the size of current of panel itself OLED.
According to one embodiment of present invention, the OLED in the pixel-driving circuit, for driving line n m to arrange
Driving unit includes:
Switching transistor, grid are connected with the output end of line n gated sweep signal wire, and source electrode and m column communicate
The output end of signal wire is connected；
Storage capacitance, one end connect the drain electrode of the switching transistor, other end electrical ground；
Transistor is driven, grid connects the drain electrode of the switching transistor, and source electrode is connected with OLED driving line, leaks
Pole connects the anode of OLED, the cathode electrical ground of the OLED；
Transistor is compensated, grid is connected with the output end of the (n+1)th row gated sweep signal wire, source electrode and the drift
The output end of the offset voltage computing unit of compensation circuit is connected, for receiving offset voltage；
Coupled capacitor, one end connect the drain electrode of the compensation transistor, and the other end connects the driving transistor
Grid.
According to one embodiment of present invention, following formula built in the offset voltage computing unit, to calculate compensation
Voltage:
Wherein, Δ VthIt is the threshold voltage drift of the driving transistor calculated according to the curent change of panel itself OLED
Shifting amount, Δ V are the amplitudes of offset voltage, and C1 and C2 are the size of the storage capacitance and coupled capacitor respectively, Cgd1, Cgd2,
Cgd3 is the switching transistor, driving transistor and the parasitic capacitance for compensating transistor respectively.
According to one embodiment of present invention, the offset voltage computing unit of the drift compensating circuit by offset voltage with
The form of pulse-period signal is supplied to the driving unit in the pixel-driving circuit, the pulsewidth etc. of the pulse-period signal
In the width of gated sweep signal.
A kind of drift compensation method of AMOLED panel pixel-driving circuit of the present invention, comprising the following steps:
S100, monitoring flow through the size of current of panel itself OLED；
S200, offset voltage is calculated according to the size of current for flowing through panel itself OLED；
S300, offset voltage is supplied to the driving transistor in pixel-driving circuit, to compensate the electricity of driving transistor
Pressure drift.
According to one embodiment of present invention, in the step S100, dummyOLED outside panel is flowed through by measuring
Size of current determines the size of current of panel itself OLED.
According to one embodiment of present invention, in the step S300, in the driving unit of the OLED of line n m column,
When the compensation transistor that the driving unit in pixel-driving circuit includes drives in the scanning that the (n+1)th row gated sweep signal wire exports
When being connected under the action of dynamic signal, offset voltage is loaded by the coupled capacitor that the driving unit in pixel-driving circuit includes
Drive the grid of transistor.
According to one embodiment of present invention, in the step S300, offset voltage is pulse-period signal, pulsewidth etc.
In the width of gated sweep signal.
The beneficial effects of the invention are as follows drift compensating circuit structure of the present invention is simple；Drift compensating circuit output
The size of thermal compensation signal voltage is adjusted by the size of current that OLED current monitoring unit flows to compensation semiconductor element, is mended
The size for repaying signal voltage is easier to control；A coupled capacitor and a compensation film crystalline substance are increased in pixel-driving circuit
Body pipe reduces the drift value of driving thin film transistor (TFT), keeps the voltage of thermal compensation signal more stable, and driving effect is more preferable.
Above-mentioned technical characteristic may be combined in various suitable ways or be substituted by equivalent technical characteristic, as long as can reach
To the purpose of the present invention.
Detailed description of the invention
The invention will be described in more detail below based on embodiments and refering to the accompanying drawings.Wherein:
Fig. 1 shows existing AMOLED panel pixel-driving circuit in background technique；
Fig. 2 shows the driving circuit of first stage during existing AMOLED panel pixel driver in background technique；
Fig. 3 shows the driving circuit of second stage during existing AMOLED panel pixel driver in background technique；
Fig. 4 shows a kind of structural schematic diagram of AMOLED panel pixel-driving circuit described in specific embodiment one；
Fig. 5 shows the structural schematic diagram of AMOLED panel in specific embodiment one；
Fig. 6 shows the timing diagram of the voltage amplitude of thermal compensation signal in specific embodiment one.
In the accompanying drawings, identical component uses identical appended drawing reference.Attached drawing is not according to actual ratio.
Specific embodiment
The present invention will be further described with reference to the accompanying drawings.
Specific embodiment 1: illustrating present embodiment, a kind of AMOLED described in present embodiment in conjunction with fig. 4 to fig. 6
Panel includes pixel-driving circuit and drift compensating circuit 7；
The OLED4 that the pixel-driving circuit is used to that line n m to be driven to arrange；The pixel-driving circuit includes that switch is brilliant
Body pipe 1, driving transistor 2, storage capacitance 3, compensation transistor 5 and coupled capacitor 6；
The drift compensating circuit circuit 7 includes OLED current monitoring unit 15 and offset voltage computing unit 14；OLED
Current monitoring unit 15 is for monitoring the size of current for flowing through panel itself OLED；Offset voltage computing unit 14 and the OLED
Current monitoring unit 15 is connected；What offset voltage computing unit 14 was used to be obtained according to the OLED current monitoring unit 15
The size of current of OLED4 calculates offset voltage, and offset voltage is supplied to the driving transistor in the pixel-driving circuit
2, to compensate the voltage drift of the driving transistor.
The grid of the switching transistor 1 is connected with the output end of line n gated sweep signal wire, switching transistor 1
Source electrode is connected with the output end of m column communication signal line, the drain electrode of switching transistor 1 simultaneously with one end of storage capacitance 3 and the
The grid of two thin film transistor (TFT)s 2 is connected；
The other end electrical ground of the storage capacitance 3；
The source electrode of the driving transistor 2 is connected with OLED driving line, and the drain electrode of the second thin film transistor (TFT) 2 is with OLED4's
Anode is connected；
The minus earth of the OLED4；
The grid of the compensation transistor 5 is connected with the output end of the (n+1)th row gated sweep signal wire, compensates transistor 5
Drain electrode be connected with one end of coupled capacitor 6；Compensate the output end phase of the source electrode and offset voltage computing unit 14 of transistor 5
Even；
The other end of the coupled capacitor 6 is connected with the grid of driving transistor 2；
A kind of AMOLED panel pixel-driving circuit composition AMOLED panel, AMOLED described in multiple present embodiments
Panel further include include power module 13, signaling interface 8, sequence controller 9, source integrated circuit 10, gray scale module 11 and Men Ji
At circuit 12；
The signaling interface 8 is connected with outside access signal, and outside access signal includes power supply signal and low-voltage differential letter
Number, Low Voltage Differential Signal is display signal；
The power supply signal output end of the signaling interface 8 is connected with the power supply signal input of power module 13；Signal connects
The power supply signal of external signal is distributed to power module 13 by mouth 8；
The Low Voltage Differential Signal input terminal phase of the Low Voltage Differential Signal output end of the signaling interface 8 and sequence controller 9
Even；The Low Voltage Differential Signal of external signal is distributed to sequence controller 9 by signaling interface 8；
The output end of the voltage signal of the power module 13 simultaneously with sequence controller 9, source integrated circuit 10, gray scale mould
Block 11 is connected with the voltage signal inputs of door integrated circuit 12；The power module 13 is according to power supply signal respectively to timing control
Device 9, source integrated circuit 10, gray scale module 11 and door integrated circuit 12 processed provide different voltage signals.
The source integrated circuit control signal output of the sequence controller 9 and the source integrated circuit control of source integrated circuit 10
Signal input part processed is connected；The door integrated circuit control signal output of sequence controller 9 and the door of door integrated circuit 12 are integrated
Circuit control signal input terminal is connected；Sequence controller 9 is according to Low Voltage Differential Signal generating source integrated circuit 10 and the integrated electricity of door
The control signal that road 12 can identify.
The reference voltage signal output end of the gray scale module 11 and the reference voltage signal input terminal of source integrated circuit 10
It is connected；Gray scale module 11 is that source integrated circuit 10 provides reference voltage.
The output end of the source integrated circuit 10 is the output end of communication signal；Communication signal is with multiple row communication signal line
Form is exported.
The output end of the door integrated circuit 12 is the output end of gated sweep signal；Gated sweep signal is with multirow grid
The mode of scan signal line exports.
The offset voltage computing unit of the drift compensating circuit provides offset voltage in the form of pulse-period signal
To the driving unit in the pixel-driving circuit, the pulsewidth of the pulse-period signal is equal to the width of gated sweep signal.
The OLED current monitoring unit 15 flows through the size of current of dummy OLED outside panel by measurement to determine
The size of current of panel itself OLED4
In the present embodiment, following formula built in the offset voltage computing unit, to calculate offset voltage:
Wherein, Δ VthIt is the threshold voltage drift of the driving transistor calculated according to the curent change of panel itself OLED
Shifting amount, Δ V are the amplitudes of offset voltage, and C1 and C2 are the size of the storage capacitance and coupled capacitor respectively, Cgd1, Cgd2,
Cgd3 is the switching transistor, driving transistor and the parasitic capacitance for compensating transistor respectively.
For the timing diagram of the voltage amplitude of thermal compensation signal as shown in fig. 6, in Fig. 6, Δ V is the voltage amplitude of thermal compensation signal, T
For the pulse period of thermal compensation signal.
Specific embodiment 2: present embodiment is based on AMOLED panel pixel driver described in specific embodiment one
The drift compensation method of circuit, in the present embodiment, comprising the following steps:
S100, monitoring flow through the size of current of panel itself OLED；The electricity of dummyOLED outside panel is flowed through by measuring
Size is flowed to determine the size of current of panel itself OLED.
S200, offset voltage is calculated according to the size of current for flowing through panel itself OLED；
S300, offset voltage is supplied to the driving transistor in pixel-driving circuit, to compensate the electricity of driving transistor
Pressure drift；In the driving unit of the OLED of line n m column, when the compensation that the driving unit in pixel-driving circuit includes is brilliant
When body pipe is connected under the action of the scanning drive signal that the (n+1)th row gated sweep signal wire exports, offset voltage passes through pixel
The coupled capacitor that driving unit in driving circuit includes is loaded into the grid of driving transistor.Offset voltage is pulse period letter
Number, pulsewidth is equal to the width of gated sweep signal.
Although describing the present invention herein with reference to specific embodiment, it should be understood that, these realities
Apply the example that example is only principles and applications.It should therefore be understood that can be carried out to exemplary embodiment
Many modifications, and can be designed that other arrangements, without departing from spirit of the invention as defined in the appended claims
And range.It should be understood that different appurtenances can be combined by being different from mode described in original claim
Benefit requires and feature described herein.It will also be appreciated that the feature in conjunction with described in separate embodiments can be used
In other described embodiments.
Claims (8)
1. a kind of AMOLED panel characterized by comprising
Pixel-driving circuit；
Drift compensating circuit comprising:
OLED current monitoring unit is used to monitor the size of current for flowing through panel itself OLED；
Offset voltage computing unit connects the OLED current monitoring unit, for according to the OLED current monitoring unit
The size of current of the OLED of acquisition calculates offset voltage, and offset voltage is supplied to the crystalline substance of the driving in the pixel-driving circuit
Body pipe, to compensate the voltage drift of the driving transistor；
In the pixel-driving circuit, the driving unit of the OLED for driving line n m to arrange includes:
Switching transistor, grid are connected with the output end of line n gated sweep signal wire, source electrode and m column communication signal
The output end of line is connected；
Storage capacitance, one end connect the drain electrode of the switching transistor, other end electrical ground；
Transistor is driven, grid connects the drain electrode of the switching transistor, and source electrode is connected with OLED driving line, and drain electrode connects
Connect the anode of OLED, the cathode electrical ground of the OLED；
Transistor is compensated, grid is connected with the output end of the (n+1)th row gated sweep signal wire, source electrode and the offset voltage
The output end of computing unit is connected, for receiving offset voltage；
Coupled capacitor, one end connect the drain electrode of the compensation transistor, and the other end connects the grid of the driving transistor.
2. AMOLED panel according to claim 1, it is characterised in that:
The OLED current monitoring unit flows through the size of current of dummy OLED outside panel by measurement to determine in panel
The size of current of portion OLED.
3. AMOLED panel according to claim 1, it is characterised in that: following built in the offset voltage computing unit to calculate
Formula, to calculate offset voltage:
Wherein, Δ VthIt is the threshold voltage shift of the driving transistor calculated according to the curent change of panel itself OLED
Amount, Δ V are the amplitudes of offset voltage, and C1 and C2 are the size of the storage capacitance and coupled capacitor respectively, Cgd1, Cgd2,
Cgd3 is the switching transistor, driving transistor and the parasitic capacitance for compensating transistor respectively.
4. AMOLED panel according to claim 1, it is characterised in that:
Offset voltage is supplied to institute by the offset voltage computing unit of the drift compensating circuit in the form of pulse-period signal
The driving unit in pixel-driving circuit is stated, the pulsewidth of the pulse-period signal is equal to the width of gated sweep signal.
5. a kind of drift compensation side of the pixel-driving circuit of the AMOLED panel as described in any one of Claims 1-4
Method, comprising the following steps:
S100, monitoring flow through the size of current of panel itself OLED；
S200, offset voltage is calculated according to the size of current for flowing through panel itself OLED；
S300, offset voltage is supplied to the driving transistor in pixel-driving circuit, to compensate the voltage drift of driving transistor
It moves.
6. drift compensation method according to claim 5, it is characterised in that:
In the step S100, the size of current of dummy OLED outside panel is flowed through by measurement to determine panel itself OLED
Size of current.
7. drift compensation method according to claim 5, it is characterised in that:
In the step S300, in the driving unit of the OLED of line n m column, when the driving unit in pixel-driving circuit
Including compensation transistor be connected under the action of the scanning drive signal that the (n+1)th row gated sweep signal wire exports when, compensation
Voltage is loaded into the grid of driving transistor by the coupled capacitor that the driving unit in pixel-driving circuit includes.
8. drift compensation method according to claim 7, which is characterized in that in the step S300, offset voltage is arteries and veins
Periodic signal is rushed, pulsewidth is equal to the width of gated sweep signal.
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| CN201610810654.XA CN106328060B (en) | 2016-09-07 | 2016-09-07 | A kind of drift compensation method of AMOLED panel and the panel pixel driving circuit |
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| CN107945764B (en) * | 2018-01-08 | 2020-06-09 | 惠科股份有限公司 | Driving circuit of display panel, display device and driving method of display panel |
| CN108628496B (en) * | 2018-04-28 | 2020-11-27 | 京东方科技集团股份有限公司 | Display substrate, manufacturing method thereof and touch display device |
| CN109727585B (en) * | 2018-12-24 | 2021-07-06 | 惠科股份有限公司 | Display driving assembly and display device |
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| CN104240639A (en) * | 2014-08-22 | 2014-12-24 | 京东方科技集团股份有限公司 | Pixel circuit, organic electroluminescence display panel and display device |
| CN104751786A (en) * | 2013-12-31 | 2015-07-01 | 乐金显示有限公司 | Organic Light Emitting Display Device And Method For Driving The Same |
| CN105702209A (en) * | 2014-12-09 | 2016-06-22 | 乐金显示有限公司 | Current sensing circuit and organic light emitting diode display including the same |
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| CN101355833A (en) * | 2007-07-27 | 2009-01-28 | 三星Sdi株式会社 | Organic light emitting display and driving method thereof |
| CN104751786A (en) * | 2013-12-31 | 2015-07-01 | 乐金显示有限公司 | Organic Light Emitting Display Device And Method For Driving The Same |
| CN104240639A (en) * | 2014-08-22 | 2014-12-24 | 京东方科技集团股份有限公司 | Pixel circuit, organic electroluminescence display panel and display device |
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