CN107978271A - OLED display and its driving method - Google Patents
OLED display and its driving method Download PDFInfo
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- CN107978271A CN107978271A CN201711381120.0A CN201711381120A CN107978271A CN 107978271 A CN107978271 A CN 107978271A CN 201711381120 A CN201711381120 A CN 201711381120A CN 107978271 A CN107978271 A CN 107978271A
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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]
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
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Abstract
The present invention relates to a kind of OLED display and its driving method.The OLED display, including pixel unit and feedback driving unit；The feedback driving unit includes：Mapping storage device, be stored with multiple theoretical voltages and with multiple theoretical voltages multiple data voltages correspondingly；Comparator, for calculating the error voltage of previous frame；Drift voltage memory, for storing the drift voltage of present frame, the drift voltage of the present frame is calculated according to the drift voltage of previous frame and the error voltage of the previous frame；Adder, for the data voltage of the present frame to be superimposed with the drift voltage of the present frame, to produce the input data voltage of present frame and be transmitted to the pixel unit.The present invention solves the problems, such as, since drive transistor threshold voltage drift is poor with display picture brightness homogeneity caused by the pressure drop on data cable, to improve the display effect of OLED display.
Description
Technical field
The present invention relates to organic light emitting display field, more particularly to a kind of OLED display and its driving method.
Background technology
Organic Light Emitting Diode (Organic Light-Emitting Diode, OLED) is current display panel research neck
One of the hot spot in domain, compared to liquid crystal display panel (Liquid Crystal Display, LCD), OLED display panel has
Low energy consumption, production cost are low, self-luminous, fast wide viewing angle and corresponding speed the advantages that.At present, shown in mobile phone display field, OLED
Show that panel has begun to substitute traditional LCD display panel.
In OLED display, when scanning signal gating switch transistor, data-signal charges to storage capacitance
Required voltage, and corresponding driving current is converted into so as to adjust the brightness of OLED by driving transistor.In this course,
In order to reach required display gray scale, it is necessary to which strictly control flows through the current precision of OLED.
However, driving transistor is subject to voltage to act on all the time in a frame time, driving transistor under long-time gate bias
Threshold voltage VthIt can drift about, and the drift of threshold voltage is unpredictable, causes display panel homogeneity very poor.Meanwhile
Because the position of pixel is different on display, the parasitic capacitance value on data cable is different with resistance value, can give different pixels point
Data cable on cause different voltage drops.Inhomogeneity caused by two above problem can make OLED current and luminosity with
Time, the change generation significant change in space, seriously affects the display performance of OLED display.
In order to solve drive transistor threshold voltage drifting problem, the circuit of generally use complexity carries out inside pixel
Compensation, such as 5T1C, 5T2C, 6T1C, 7T1C, but this will necessarily make drive circuit become more complicated, Pixel Dimensions increase, and
And transistor increases the aperture opening ratio of display panel can be caused to decline, production qualification rate is also reduced.It is meanwhile this inside pixel
Compensation method can not eliminate data line capacitance resistance caused by OLED voltage voltage drop error.
Therefore, the display performance of OLED display how is improved, avoids the occurrence of display inhomogeneity, is urgently to solve at present
Technical problem certainly.
The content of the invention
The present invention provides a kind of OLED display and its driving method, to solve the aobvious of existing OLED display
Show the problem of homogeneity is poor, to improve the display effect of OLED display.
To solve the above-mentioned problems, the present invention provides a kind of OLED display, including pixel unit, feedback is further included
Driving unit；Wherein, the feedback driving unit includes：
Mapping storage device, is stored with multiple theoretical voltages and multiple data are electric correspondingly with multiple theoretical voltages
Pressure, matched present frame is selected for the data voltage of the theoretical voltage according to the pixel unit present frame or present frame
Data voltage or present frame theoretical voltage；
Comparator, connects the pixel unit, the mapping storage device, for obtaining the reality of the pixel unit previous frame
Border voltage, and by the virtual voltage of the previous frame compared with the theoretical voltage of previous frame, to obtain the error of previous frame
Voltage；
Drift voltage memory, connects the comparator, for storing the drift voltage of the pixel unit present frame, institute
The drift voltage for stating present frame is to be calculated according to the drift voltage of previous frame with the error voltage；
Adder, connects the drift voltage memory, the mapping storage device, for the data of the present frame are electric
Pressure is superimposed with the drift voltage of the present frame, to produce the input data voltage of present frame and be transmitted to the pixel unit.
Preferably, the pixel unit includes the first transistor, second transistor, third transistor, capacitor；Described
The grid of one transistor, the grid of the third transistor are connected with scanning signal input terminal；The source of the first transistor
Pole is connected with the adder, drains while is connected with the grid of the second transistor, the first end of the capacitor；It is described
The source electrode connection power voltage input terminal of second transistor, drain electrode is connected with the second end of the capacitor at the same time, OLED shines
Device and the connection of the source electrode of the third transistor；The drain electrode of the third transistor is connected with the comparator.
Preferably, the feedback driving unit further includes enabled controller, and the enabled controller includes control element, the
One switch element, second switch element, the 3rd switch element；The first end of the first switching element connects the pixel list
Member, second end connect the comparator, control terminal connects the control element；The first end connection institute of the second switch element
State comparator, mapping storage device, control terminal connect the control element described in second end；The first end of 3rd switch element
Connect the drift voltage memory, second end connects the comparator, control terminal connects the control element.
Preferably, the control element is used to judge whether the error voltage of the previous frame is less than preset value, if so, then
The first switching element, the second switch element, the 3rd switch element is controlled to disconnect.
Preferably, the control element be used for judge the corresponding drift voltage of the pixel unit continuous multiple frames whether phase
Together, if so, then controlling the first switching element, the second switch element, the 3rd switch element to disconnect.
Preferably, the drift voltage of first frame of pixel unit is 0.
Preferably, the OLED display includes depositing in multiple pixel units of rectangular arrangement, the drift voltage
Reservoir includes multiple memory spaces in rectangular arrangement, and the multiple pixel unit and the multiple memory space one are a pair of
Should.
To solve the above-mentioned problems, present invention also offers a kind of driving method of OLED display, including above-mentioned
OLED display described in one, includes the following steps：
A mapping storage device is established, for storing multiple theoretical voltages and multiple correspondingly with multiple theoretical voltages
Data voltage；Selected for the data voltage of the theoretical voltage according to the pixel unit present frame or present frame matched
The data voltage of present frame or the theoretical voltage of present frame；
The theoretical voltage of a pixel unit present frame or the data voltage of present frame are obtained, and from the mapping storage device
Select the data voltage of matched present frame or the theoretical voltage of present frame；
Obtain the virtual voltage of the pixel unit previous frame, and by the reason of the virtual voltage of the previous frame and previous frame
It is compared by voltage, to obtain the error voltage of previous frame；
The drift voltage of present frame is calculated according to the error voltage of the drift voltage of previous frame and the previous frame；
The data voltage of the present frame is superimposed with the drift voltage of the previous frame, to produce the input number of present frame
According to voltage and it is transmitted to the pixel unit.
OLED display provided by the invention and its driving method, feed back driving unit, constantly to effect by building
In pixel unit virtual voltage compared with theoretical voltage, and according to comparative result to input pixel unit data voltage
Compensate, solve since drive transistor threshold voltage drift is equal with display picture brightness caused by the pressure drop on data cable
The problem of one property is poor, improves the display effect of OLED display；Moreover, the feedback driving unit that the present invention is built is located at
Outside pixel unit, while display panel aperture opening ratio is not influenced, OLED display internal circuit configuration is also reduced
Complexity.
Brief description of the drawings
Attached drawing 1 is the structure diagram of the OLED display of the specific embodiment of the invention；
Attached drawing 2 is the electrical block diagram of a pixel unit in the specific embodiment of the invention；
Attached drawing 3 is the electrical block diagram of an OLED display of the specific embodiment of the invention；
Attached drawing 4 is the electrical block diagram of another OLED display of the specific embodiment of the invention；
Attached drawing 5 is the driving method flow diagram of the OLED display of the specific embodiment of the invention.
Embodiment
The embodiment of OLED display provided by the invention and its driving method is done in detail below in conjunction with the accompanying drawings
Describe in detail bright.
Present embodiment provides a kind of OLED display, and attached drawing 1 is the OLED of the specific embodiment of the invention
The structure diagram of display device.
As shown in Figure 1, the OLED display that present embodiment provides, including display panel 12.The display surface
Plate 12 include pel array 123, for the pel array 123 provide row selects signal row selection driver 121 and
For providing the data input voltage drive division 122 of data-signal to the pel array 123.Wrapped in the pel array 123
Include multiple pixel units arranged in arrays.
Attached drawing 2 is the electrical block diagram of a pixel unit in the specific embodiment of the invention.Present embodiment
Illustrated by taking the P-type transistor shown in Fig. 2 as an example, but be not the limitation to present embodiment.As shown in Figure 2
In AMOLED in the circuit structure of 3T1C pixel units, in saturation region operation, according to the current-voltage characteristic of P-type transistor,
Theoretical voltage V corresponding with a certain gray level can be obtained according to equation below (1), (2)OLEDValue：
In above-mentioned formula (1), (2), IOLED、VOLEDTo flow through the theoretical current of OLED luminescent devices and acting on OLED
The theoretical voltage of luminescent device, IDFor the drain current of second transistor T2, VSGSource electrode and drain electrode for second transistor T2
Between voltage, VthFor the threshold voltage of second transistor T2, VDDFor the voltage source of second transistor T2 source electrodes connection, VDATAFor
The input data voltage of one transistor T1 source electrodes connection.W、L、μn、COXRespectively second transistor T2 channel widths, raceway groove length
Degree, carrier mobility, gate oxide capacitance, K1、K2, β be constant value, wherein β is between 0.3~0.5.
Due to transistor threshold voltage drift △ VthAnd voltage drop V on data cableIRSo that counted by formula (1), (2)
Obtained theoretical voltage V corresponding with a certain gray levelOLEDWith practical function in OLED luminescent devices (such as organic light emission two
Pole pipe) on voltage V'OLEDBetween there are deviation, voltage such as following formula (3), (4) institute on practical function to OLED luminescent devices
Show：
In above-mentioned formula (3), (4), I'OLED、V'OLEDTo flow through the actual current of OLED luminescent devices and acting on
The virtual voltage of OLED luminescent devices, I'DFor the drain electrode actual current of second transistor T2, VSGFor the source electrode of second transistor T2
Voltage between drain electrode, VthFor the threshold voltage of second transistor T2, △ VthFor the threshold voltage shift of second transistor T2
Value, VDDFor the voltage source of second transistor T2 source electrodes connection, VDATAThe input data voltage connected for the first transistor T1 source electrodes,
VIRFor voltage drop of the input data voltage in input line.W、L、μn、COXRespectively second transistor T2 channel widths, raceway groove length
Degree, carrier mobility, gate oxide capacitance, K1、K2, β be constant value, wherein β is between 0.3~0.5.
Make to solve the theoretical voltage caused by voltage drop in transistor threshold voltage drift and data cable with actual
Voltage for OLED luminescent devices there are deviation, caused by the problem of display picture brightness disproportionation one, this specific implementation
The OLED display that mode provides, further includes the feedback driving unit 11 being connected with the pixel unit, with to the pixel
Unit carries out voltage compensation.The feedback driving unit 11 includes mapping storage device 111, comparator 112, drift voltage memory
113 and adder 114.
Attached drawing 3 is the electrical block diagram of an OLED display of the specific embodiment of the invention, and attached drawing 4 is this hair
The electrical block diagram of another OLED display of bright embodiment.The mapping storage device 111, is stored with multiple
Theoretical voltage VOLEDAnd with multiple theoretical voltages multiple data voltage V correspondinglyDATA.Multiple theoretical voltage VOLEDWith it is more
A gray level corresponds.In order to strengthen voltage compensation effect, while increase the application range of feedback driving unit, it is preferred that
The multiple theoretical voltage V stored in the mapping storage device 111 of present embodimentOLEDIt is a pair of with all gray levels one
Should.The mapping storage device 111 is used for according to the theoretical voltage of 31 present frame of pixel unit or the data voltage of present frame
Select the data voltage of matched present frame or the theoretical voltage of present frame.I.e. according to the mapping storage device 111 from outer
The theoretical voltage of present frame or the data voltage of present frame that boundary obtains, obtain corresponding present frame by the way of mapping look-up of table
Data voltage or present frame theoretical voltage.Specifically, the following two kinds situation can be divided into：
(a) as shown in figure 3, when the mapping storage device 111 from the external world obtain be 31 present frame of pixel unit
Theoretical voltage VOLED,n, then the mapping storage device 111 is according to the theoretical voltage V of present frameOLED,nSelect matched current
The data voltage V of frameDATA,n, and by the theoretical voltage V of the present frameOLED,nIt is transmitted to the comparator 112, the present frame
Data voltage VDATA,nIt is transmitted to adder 114；Wherein, n represents the frame number of 31 present frame of pixel unit, and n is just
Integer；
(b) as shown in figure 4, when the mapping storage device 111 from the external world obtain be 31 present frame of pixel unit
Data voltage VDATA,n, then the mapping storage device 111 is according to the data voltage V of present frameDATA,nSelect matched current
The theoretical voltage V of frameOLED,n, and by the theoretical voltage V of the present frameOLED,nIt is transmitted to the comparator 112, the present frame
Data voltage VDATA,nAdder 114 is transmitted to, wherein, n represents the frame number of 31 present frame of pixel unit, and n is just
Integer.
The comparator 112, connects the pixel unit 31, the mapping storage device 111, for obtaining the pixel list
The virtual voltage V' of first 31 previous framesOLED,n-1, and by the virtual voltage V' of the previous frameOLED,n-1With the theory electricity of previous frame
Press VOLED,n-1It is compared, to obtain the error voltage △ V of previous framen-1。
The drift voltage memory 113, connects the comparator 112, for storing 31 present frame of pixel unit
Drift voltage △ Vd,n, the drift voltage △ V of the present framed,nIt is the drift voltage △ V according to previous framed,n-1On described
The error voltage △ V of one framen-1It is calculated.Shown in specific calculating process such as following formula (5), (6)：
△Vn-1=K2((VIR,n-1-VIR,n-2)+(△Vth,n-1-△Vth,n-2)) (5)
△Vd,n=△ Vd,n-1+△Vn-1=K2(VIR,n+△Vth,n) (6)
In above-mentioned formula (5), (6), △ Vn-1It is the (n-1)th frame error voltage, is specially the theoretical voltage of OLED luminescent devices
And the difference of virtual voltage, VIR,n-1、VIR,n-2It is the voltage drop of the (n-1)th frame and the n-th -2 frame data voltage on the data line, △
Vth,n-1、△Vth,n-1、△Vth,n-2It is second when n-th frame, the (n-1)th frame, the n-th -2 frame data voltage act on second transistor T2
The threshold voltage shift amount of transistor T2, △ Vd,n、△Vd,n-1, be n-th frame and the total drift voltage value of the (n-1)th frame, K2It is constant
Value.
From above-mentioned formula (5), (6) as can be seen that the drift voltage of the present frame is reflected on the pixel unit 31
One frame transistor threshold voltage drift △ VTh, n-1With the voltage drop V on data cableIR, n-1。
When present frame is the first frame of the pixel unit 31, in order to realize the voltage compensation to the pixel unit,
Need to set the concrete numerical value of the drift voltage of 31 first frame of pixel unit, i.e., the corresponding drift electricity of described pixel unit 31
The initial value of pressure, those skilled in the art can be set according to actual needs, due to needing by multiple feedback, mending
Repay, therefore, the concrete numerical value of the drift voltage of 31 first frame of pixel unit does not produce final feedback compensation result
Influence, can simply influence the time fed back, compensated.In order to simplify circuit structure, the efficiency of feedback compensation is improved, it is preferred that institute
The drift voltage for stating 31 first frame of pixel unit is 0.For the pixel unit 31, deposited in the drift voltage memory 113
The numerical value of the drift voltage of the present frame of storage is the drift voltage △ V according to previous framed,n-1With the error voltage of the previous frame
△Vn-1Calculate what is constantly updated, i.e., the drift of 31 present frame of the pixel unit stored in described drift voltage memory 113
Voltage can cover the drift voltage of 31 previous frame of pixel unit, to save memory, simplify circuit structure.
The adder 114, connects the drift voltage memory 113, the mapping storage device 111, for by described in
The data voltage V of present frameDATA,nWith the drift voltage △ V of the present framed,nSuperposition, to produce the input data of present frame electricity
Press V'DATA,nAnd the pixel unit 31 is transmitted to, to realize the voltage compensation to present frame.
In order to it is timely, accurately obtain the virtual voltage put in the pixel unit 31 on OLED luminescent devices, simultaneously
Feed back to the comparator 112, it is preferred that as shown in Figure 3,4, the pixel unit 31 includes the first transistor T1, the second crystalline substance
Body pipe T2, third transistor T3, capacitor C；The grid of the first transistor T1, the third transistor T3 grid with
Scanning signal SCAN input terminals connect；The source electrode of the first transistor T1 is connected with the adder 114, drain at the same time with institute
State the first end connection of the grid, the capacitor C of second transistor T2, the input data voltage V' of the present frameDATA, nPass
Transport to the source electrode of the first transistor T1.The source electrode connection supply voltage VDD input terminals of the second transistor T2, drain electrode are same
When be connected with the second end of the capacitor C, OLED luminescent devices (such as Organic Light Emitting Diode) and the third transistor
The source electrode connection of T3；The drain electrode of the third transistor T3 is connected with the comparator 112.Specifically, the pixel unit
31 driving is divided into two stages of operation phase and light emission period：In the operation phase, the scanning signal SCAN controls described first
Transistor T1, the second transistor T3 are turned on, the input data voltage V' of present frameDATA, nPass through the first transistor T1
The grid of the second transistor T2 is acted on, supply voltage VDD acts on the OLED by the second transistor T2 and sends out
Optical device, at this time, acts on the voltage V' on the OLED luminescent devicesOLED, nAfter feedback line gathers, the comparison is transmitted to
Device 112, the theoretical voltage V with 31 present frame of pixel unitOLED, nIt is compared, so as to obtain the error voltage of present frame
△Vn；In the light emission period, the scanning signal SCAN controls the first transistor T1, the second transistor T3 to disconnect,
The capacitance C maintains the second transistor T2 grid voltages constant.In the operation phase, by adjusting the second transistor T2's
Grid voltage, control flow through the size of current of the Organic Light Emitting Diode, change so as to fulfill the light and shade of display picture.Its
In, the first transistor T1, the second transistor T2, the third transistor T3 can be P-type transistor or
N-type transistor, present embodiment are not construed as limiting this.
In order to realize the flexible control to the feedback driving unit 11, it is preferred that the feedback driving unit 11 also wraps
Include enabled controller 115, the enabled controller 115 include control element, first switching element S1, second switch element S2,
3rd switch element S3；The first end of the first switching element S1 connects the pixel unit 31, second end connects the ratio
The control element is connected compared with device 112, control terminal；The first end of the second switch element S2 connects the comparator 112, the
Mapping storage device 111, control terminal connect the control element described in two ends；The first end connection institute of the 3rd switch element S3
State drift voltage memory 113, second end connects the comparator 112, control terminal connects the control element.It is furthermore preferred that
The control element is used for the error voltage △ V for judging the previous framen-1Whether preset value is less than, if so, then controlling described
One switch element S1, the second switch element S2, the 3rd switch element S3 are disconnected.Or, it is preferred that the control member
Part is used to judge whether the corresponding drift voltage of 31 continuous multiple frames of pixel unit is identical, if so, then controlling described first to open
Element S1, the second switch element S2, the 3rd switch element S3 is closed to disconnect.
Specifically, the driving of the feedback driving unit 11 is divided into first stage and second stage.In first rank
Section, the control element control the first switching element S1, the second switch element S2, the 3rd switch element S3 to close
Close, the virtual voltage V' of present frame on OLED luminescent devicesOLED, nThe comparator 112 is fed back to, the theory electricity with present frame
Press VOLED, nThe nearlyer error voltage △ V for comparing, producing present framen；Pass through the error voltage △ V to present framenWith present frame
Drift voltage △ VD, nSuperposition calculation, to produce the drift voltage △ V of next frameD, n+1, with the data voltage to next frame
VDATA, n+1Compensate.In this way, by repeatedly feedback, compensation, the error voltage △ V of present framenLess than preset value or continuous
The corresponding drift voltage △ V of multiframedIt is identical, then confirm that feedback compensation is stable, at this time, control element control described the
One switch element S1, the second switch element S2, the 3rd switch element S3 are disconnected, into the feedback driving unit 11
Second stage.In the second stage, due to the mapping storage device 111 and the adder 114, the adder
The 114 drift voltage memories 113 are in connection status all the time, thus, the adder 114 still continues the drift
The drift voltage stored in voltage memory 113 is superimposed with the data voltage, to generate input data voltage, and is transmitted to institute
Pixel unit is stated, is compensated so as to fulfill intermittent feed-back, continuation.
In order to ensure each pixel unit in the pel array 123 of the OLED display can carry out it is accurate,
Effective feedback compensation, it is preferred that the OLED display includes multiple pixel units in rectangular arrangement, the drift
Voltage memory 113 includes multiple memory spaces in rectangular arrangement, and the multiple pixel unit and the multiple storage are empty
Between correspond.For example, the pel array 123 includes A × B pixel unit, then the drift voltage memory 113
Include A × B memory space, and a rows, the corresponding drift voltage of pixel unit of b row begin in the pel array 123
It is stored in eventually in the memory space of a rows in the drift voltage memory 113, b row, and the drift voltage meeting of present frame
The drift voltage of previous frame is covered, to realize the continuous renewal of drift voltage, until feedback compensation reaches stable state.
The OLED display that present embodiment provides, feeds back driving unit, constantly to acting on picture by building
The virtual voltage of plain unit carries out the data voltage for inputting pixel unit compared with theoretical voltage, and according to comparative result
Compensation, solves due to drive transistor threshold voltage drift and display picture brightness homogeneity caused by the pressure drop on data cable
The problem of poor, improve the display effect of OLED display；Moreover, the feedback driving unit that the present invention is built is located at pixel
Outside unit, while display panel aperture opening ratio is not influenced, the complexity of OLED display internal circuit configuration is also reduced
Property.
Moreover, present embodiment provides a kind of driving method of OLED display, including any of the above-described
OLED display described in.Attached drawing 5 is that the driving method flow of the OLED display of the specific embodiment of the invention is shown
It is intended to.As shown in figure 5, the driving method for the OLED display that present embodiment provides, includes the following steps：
Step S51, establishes a mapping storage device, for storing multiple theoretical voltages and a pair of with multiple theoretical voltages one
The multiple data voltages answered, and according to the theoretical voltage of the pixel unit present frame or the data voltage selection of present frame and its
The data voltage of matched present frame or the theoretical voltage of present frame.Multiple theoretical voltage VOLEDIt is a pair of with multiple gray levels one
Should.In order to strengthen voltage compensation effect, it is preferred that the multiple theories stored in the mapping storage device of present embodiment
Voltage VOLEDCorresponded with all gray levels.According to the theoretical voltage of the pixel unit present frame or the data of present frame electricity
Pressure selects the matched data voltage of present frame or the theoretical voltage of present frame, specifically includes the following two kinds mode：
(a) when the mapping storage device from the external world obtain be the pixel unit present frame theoretical voltage VOLED,n, then
The mapping storage device is according to the theoretical voltage V of present frameOLED,nSelect the data voltage V of matched present frameDATA,n；Its
In, n represents the frame number of the pixel unit present frame, and n is positive integer；
(b) when the mapping storage device from the external world obtain be the pixel unit present frame data voltage VDATA,n, then
The mapping storage device is according to the data voltage V of present frameDATA,nSelect the theoretical voltage V of matched present frameOLED,n；Its
In, n represents the frame number of the pixel unit present frame, and n is positive integer.
Step S52, obtains the theoretical voltage of a pixel unit present frame or the data voltage of present frame, and from the mapping
The data voltage of matched present frame or the theoretical voltage of present frame are selected in memory.
Step S53, obtains the virtual voltage V' of the pixel unit previous frameOLED,n-1, and by the reality of the previous frame
Voltage V'OLED,n-1With the theoretical voltage V of previous frameOLED,n-1It is compared, to obtain the error voltage △ V of previous framen-1。
Step S54, the drift of present frame is calculated according to the error voltage of the drift voltage of previous frame and the previous frame
Move voltage.When present frame is the first frame of the pixel unit, in order to realize to the voltage compensation of the pixel unit, it is necessary to
The concrete numerical value of the drift voltage of first frame of pixel unit is set, those skilled in the art can carry out according to being actually needed
Setting, due to needing by multiple feedback, compensation, the concrete numerical value of the drift voltage of first frame of pixel unit
Final feedback compensation result is not had an impact, can simply influence the time fed back, compensated.In order to simplify circuit structure,
Improve the efficiency of feedback compensation, it is preferred that the drift voltage of first frame of pixel unit is 0.
Step S55, the data voltage of the present frame is superimposed with the drift voltage of the previous frame, to produce present frame
Input data voltage and be transmitted to the pixel unit.
The driving method for the OLED display that present embodiment provides, feeds back driving unit, constantly by building
To acting on the virtual voltage of pixel unit compared with theoretical voltage, and according to comparative result to inputting the number of pixel unit
Compensate, solved due to drive transistor threshold voltage drift and display picture caused by the pressure drop on data cable according to voltage
The problem of brightness homogeneity is poor, improves the display effect of OLED display；Moreover, the feedback driving that the present invention is built is single
Member while display panel aperture opening ratio is not influenced, also reduces OLED display internal circuit outside pixel unit
The complexity of structure.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
Member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications also should be regarded as
Protection scope of the present invention.
Claims (8)
1. a kind of OLED display, including pixel unit, it is characterised in that further include feedback driving unit；
Wherein, the feedback driving unit includes：
Mapping storage device, be stored with multiple theoretical voltages and with multiple theoretical voltages multiple data voltages correspondingly, use
The number of matched present frame is selected in the data voltage of the theoretical voltage according to the pixel unit present frame or present frame
According to the theoretical voltage of voltage or present frame；
Comparator, connects the pixel unit, the mapping storage device, for obtaining the actual electricity of the pixel unit previous frame
Pressure, and by the virtual voltage of the previous frame compared with the theoretical voltage of previous frame, to obtain the error voltage of previous frame；
Drift voltage memory, connects the comparator, described to work as storing the drift voltage of the pixel unit present frame
The drift voltage of previous frame is calculated according to the drift voltage of previous frame and the error voltage of the previous frame；
Adder, connects the drift voltage memory, the mapping storage device, for by the data voltage of the present frame with
The drift voltage superposition of the present frame, to produce the input data voltage of present frame and be transmitted to the pixel unit.
2. OLED display according to claim 1, it is characterised in that the pixel unit include the first transistor,
Second transistor, third transistor, capacitor；The grid of the first transistor, the grid of the third transistor are with sweeping
Retouch signal input part connection；The source electrode of the first transistor is connected with the adder, drain at the same time with second crystal
The first end connection of the grid of pipe, the capacitor；The source electrode connection power voltage input terminal of the second transistor, drain electrode are same
When be connected with the second end of the capacitor, the connection of the source electrode of OLED luminescent devices and the third transistor；Described 3rd is brilliant
The drain electrode of body pipe is connected with the comparator.
3. OLED display according to claim 1, it is characterised in that the feedback driving unit further includes enabled control
Device processed, the enabled controller include control element, first switching element, second switch element, the 3rd switch element；Described
The first end of one switch element connects the pixel unit, second end connects the comparator, the control terminal connection control member
Part；The first end of the second switch element connects the comparator, mapping storage device described in second end, described in control terminal connection
Control element；The first end of 3rd switch element connects the drift voltage memory, second end connects the comparator,
Control terminal connects the control element.
4. OLED display according to claim 3, it is characterised in that the control element is used to judge described upper one
Whether the error voltage of frame is less than preset value, if so, then controlling the first switching element, the second switch element, described
3rd switch element disconnects.
5. OLED display according to claim 1, it is characterised in that the control element is used to judge the pixel
Whether the corresponding drift voltage of unit continuous multiple frames is identical, if so, then controlling the first switching element, second switch member
Part, the 3rd switch element disconnect.
6. OLED display according to claim 1, it is characterised in that the drift voltage of first frame of pixel unit
For 0.
7. OLED display according to claim 1, it is characterised in that the OLED display is included in rectangular
Multiple pixel units of arrangement, the drift voltage memory includes multiple memory spaces in rectangular arrangement, the multiple
Pixel unit is corresponded with the multiple memory space.
8. a kind of driving method of OLED display, including the claims 1-7 any one of them OLED displays,
It is characterised in that it includes following steps：
Establish a mapping storage device, for store multiple theoretical voltages and with multiple theoretical voltages multiple data correspondingly
Voltage, and matched present frame is selected according to the theoretical voltage of the pixel unit present frame or the data voltage of present frame
Data voltage or present frame theoretical voltage；
The theoretical voltage of a pixel unit present frame or the data voltage of present frame are obtained, and is selected from the mapping storage device
The data voltage of matched present frame or the theoretical voltage of present frame；
The virtual voltage of the pixel unit previous frame is obtained, and the theory of the virtual voltage of the previous frame and previous frame is electric
Pressure is compared, to obtain the error voltage of previous frame；
The drift voltage of present frame is calculated according to the error voltage of the drift voltage of previous frame and the previous frame；
The data voltage of the present frame is superimposed with the drift voltage of the previous frame, to produce the input data of present frame electricity
Press and be transmitted to the pixel unit.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111292700A (en) * | 2020-03-31 | 2020-06-16 | 京东方科技集团股份有限公司 | TFT threshold voltage compensation method and device and display |
| WO2020119185A1 (en) * | 2018-12-14 | 2020-06-18 | 昆山国显光电有限公司 | Display panel, pixel circuit and driving method therefor |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102881257A (en) * | 2012-10-18 | 2013-01-16 | 四川虹视显示技术有限公司 | Active organic light-emitting diode displayer and driving method thereof |
| CN104751771A (en) * | 2013-12-25 | 2015-07-01 | 昆山国显光电有限公司 | Pixel circuit structure, active matrix organic light-emitting display device and driving method thereof |
| CN105047137A (en) * | 2015-09-09 | 2015-11-11 | 深圳市华星光电技术有限公司 | AMOLED real-time compensation system |
-
2017
- 2017-12-20 CN CN201711381120.0A patent/CN107978271B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102881257A (en) * | 2012-10-18 | 2013-01-16 | 四川虹视显示技术有限公司 | Active organic light-emitting diode displayer and driving method thereof |
| CN104751771A (en) * | 2013-12-25 | 2015-07-01 | 昆山国显光电有限公司 | Pixel circuit structure, active matrix organic light-emitting display device and driving method thereof |
| CN105047137A (en) * | 2015-09-09 | 2015-11-11 | 深圳市华星光电技术有限公司 | AMOLED real-time compensation system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020119185A1 (en) * | 2018-12-14 | 2020-06-18 | 昆山国显光电有限公司 | Display panel, pixel circuit and driving method therefor |
| CN111292700A (en) * | 2020-03-31 | 2020-06-16 | 京东方科技集团股份有限公司 | TFT threshold voltage compensation method and device and display |
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|---|---|
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