CN109949748A - Show compensation data method, display compensation data device and display device - Google Patents
Show compensation data method, display compensation data device and display device Download PDFInfo
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Abstract
The present invention provides a kind of display compensation data method, display compensation data device and display device, this method comprises: showing data to sub-pixel input test in frame idle phase；Obtain the actual sensed data by sensing after preset charged duration from sub-pixel；According to test display data, actual sensed data and the compensation reference data prestored, the temperature change value of sub-pixel is determined；According to the threshold voltage and mobility variation with temperature amount of the temperature change value of sub-pixel and the driving transistor of the sub-pixel prestored, threshold voltage compensation value and mobility offset are calculated；Show that the stage compensates according to threshold voltage compensation value and mobility offset to be output to the display data of sub-pixel in frame.In the present invention, in display device actual displayed, influence of the temperature change to mobility and threshold voltage is considered, to obtain relatively accurate mobility offset and threshold voltage compensation value, to improve the image display quality of display device.
Description
Technical field
The present invention relates to field of display technology more particularly to a kind of display compensation data methods, display compensation data device
And display device.
Background technique
OLED (Organic Light Emitting Diode) display device is because of its wide colour gamut, wide viewing angle, slimming, lightness, low power consuming, height
The outstanding function such as contrast, flexible and widely received by people, be increasingly becoming the developing direction of the following display technology.But
In large scale OLED display field, because of its oxide process, unstable TFT (thin film transistor (TFT)) characteristic is that its maximum lacks
Point, the unstable reduction for causing image quality of TFT.
Since OLED display is voltage control electric current and then the display mode for controlling brightness, brightness not only with
Show that voltage is related, it is also related with the mobility (K) of driving transistor and threshold voltage (Vth).
Flow through the electric current I of driving transistorOLEDIt can be indicated by following formula:
Wherein, K is carrier mobility (may be simply referred to as mobility), and Cox is gate oxide capacitance, and W/L is driving crystal
Pipe breadth length ratio, Vgs are the gate source voltage for driving transistor, and Vth is the threshold voltage for driving transistor.
It can see mobility and threshold voltage to I from formula aboveOLEDInfluence it is very big.It is sent out in OLED display panel
It in photoreduction process, drives the mobility of transistor and threshold voltage that can shift, so that image quality be made seriously to reduce, therefore needs
The mobility and threshold voltage for driving transistor are compensated.
Conventional external compensation way is, by the compensation way that shuts down, moving for driving transistor to be calculated in test phase
Shifting rate and threshold voltage, and mobility and threshold voltage are compensated in the actual displayed stage in turn.Due to shutdown compensation with
The various conditions in actual displayed stage are all different, therefore compensation of shutting down is difficult to obtain accurate mobility and threshold voltage,
There are image retention or Mura (brightness irregularities) to occur under low illumination conditions.
Summary of the invention
In view of this, the present invention provides a kind of display compensation data method, display compensation data device and display device, use
In the existing external compensation mode of solution, it is difficult to accurate mobility and threshold voltage are obtained, to have under low illumination conditions
Image retention or the Mura problem.
In order to solve the above technical problems, the present invention provides a kind of display compensation data method, it is applied to display device, it is described
Display device includes multiple sub-pixels, and each sub-pixel includes luminescent device and driving transistor, which comprises
In the frame idle phase of the display device, Xiang Suoshu sub-pixel input test shows data；
Obtain the actual sensed data by sensing after preset charged duration from the sub-pixel；
Data, actual sensed data and the compensation reference data prestored are shown according to the test, determine the sub-pixel
Temperature change value；
According to the threshold voltage of the temperature change value of the sub-pixel and the driving transistor of the sub-pixel that prestores with
The variable quantity and mobility variation with temperature amount of temperature calculate threshold voltage compensation value and mobility offset；
The stage is shown in the frame of the display device, according to the threshold voltage compensation value and the mobility offset,
It is compensated to be output to the display data of the sub-pixel.
Optionally, the compensation reference data prestored includes:
Data are sensed in the reference that test phase obtains；With
In the reference mobility that test phase obtains.
Optionally, the temperature change value is calculated using following formula:
Wherein, Δ N is the temperature change value, and K1 is described with reference to mobility, and L is that test phase obtains reference threshold electricity
The gradation data inputted when pressure, V1 are described with reference to data are sensed, and V2 is the actual sensed data, and t1 is the son prestored
The threshold voltage variation with temperature amount of the driving transistor of pixel, t2 is moving for the driving transistor of the sub-pixel prestored
Shifting rate variation with temperature amount.
Optionally, the test phase is to carry out threshold voltage and migration by the way of shutdown compensation under assigned temperature
The compensating test of value.
Optionally, described to be prepared by the following with reference to sensing data:
In test phase sensing reference threshold voltage vt h1, wherein when sensing the reference threshold voltage, to the son
The display voltage of pixel input is Data；
Data+Vth1 is inputted to the sub-pixel, is obtained with reference to mobility K1；
Data1 is inputted to the sub-pixel, whereinAnd it obtains by described pre-
If the reference sensing data V1 sensed after charging duration from the sub-pixel, wherein L is the corresponding gradation data of Data.
Optionally, the threshold voltage according to the temperature change value and the driving transistor of the sub-pixel prestored
Variation with temperature amount and mobility variation with temperature amount, calculate threshold voltage compensation value and mobility offset includes:
According to the threshold voltage of the temperature change value and the driving transistor of the sub-pixel prestored with the change of temperature
Change amount and mobility variation with temperature amount obtain the compensation variable quantity of the compensation variable quantity and mobility of threshold voltage；
According to the threshold voltage compensation variable quantity and mobility compensation variable quantity, obtain threshold voltage compensation value and
Mobility offset.
Optionally, the compensation variable quantity of the threshold voltage is calculated by the following formula: Δ Vth=Δ N × t1, wherein
Δ Vth is the compensation variable quantity of the threshold voltage, and Δ N is the temperature change value, and t1 is the drive of the sub-pixel prestored
The threshold voltage variation with temperature amount of dynamic transistor；
The compensation variable quantity of the mobility is calculated by the following formula: Δ K=Δ N × t2, Δ K are the mobility
Variable quantity is compensated, Δ N is the temperature change value, and t2 is the mobility of the driving transistor of the sub-pixel prestored with temperature
Variable quantity.
Optionally, the compensation variable quantity of the compensation variable quantity and mobility according to the threshold voltage, obtains threshold value
Voltage compensation value and mobility offset include:
By searching for threshold voltage compensation table and mobility compensation forms, obtains threshold voltage compensation value and mobility is mended
Value is repaid, includes being obtained by the variable quantity of reference threshold voltage Vth1 and different threshold voltages in the threshold voltage compensation table
Threshold voltage compensation value Vth, include by the change of reference mobility K1 and different mobilities in the mobility compensation forms
Change the mobility offset K measured.
Optionally, the compensated data voltage is calculated using following formula:
Wherein, Data ' is the compensated data voltage, and K is the mobility offset, and Vth is the threshold value electricity
Offset is pressed, L ' is the luma data that receives.
The present invention also provides a kind of display compensation data devices, are applied to display device, the display device includes multiple
Sub-pixel, each sub-pixel include luminescent device and driving transistor, and the display compensation data device includes:
Data outputting unit, for the frame idle phase in the display device, Xiang Suoshu sub-pixel input test is shown
Data；
Data capture unit is sensed, for obtaining the reality passed through and sensed after preset charged duration from the sub-pixel
Sense data；
Temperature change value computing unit, for showing data, actual sensed data and the compensation prestored according to the test
Reference data determines the temperature change value of the sub-pixel；
Compensation value calculation unit, for according to the temperature change value of the sub-pixel and the driving of the sub-pixel prestored
The threshold voltage variation with temperature amount and mobility variation with temperature amount of transistor calculate threshold voltage compensation value and migration
Rate offset；
The data outputting unit is also used to show the stage in the frame of the display device, be mended according to the threshold voltage
Value and the mobility offset are repaid, is compensated to be output to the display data of the sub-pixel.
Optionally, the compensation reference data prestored includes:
Data are sensed in the reference that test phase obtains；With
In the reference mobility that test phase obtains.
Optionally, the temperature change value is calculated using following formula:
Wherein, Δ N is the temperature change value, and K1 is described with reference to mobility, and L is that test phase obtains reference threshold electricity
The gradation data inputted when pressure, V1 are described with reference to data are sensed, and V2 is the actual sensed data, and t1 is the son prestored
The threshold voltage variation with temperature amount of the driving transistor of pixel, t2 is moving for the driving transistor of the sub-pixel prestored
Shifting rate variation with temperature amount.
Optionally, the compensation value calculation unit, for according to the temperature change value and the sub-pixel that prestores
The threshold voltage variation with temperature amount and mobility variation with temperature amount for driving transistor, the compensation for obtaining threshold voltage become
The compensation variable quantity of change amount and mobility；According to the compensation variable quantity of the compensation variable quantity and mobility of the threshold voltage, obtain
To threshold voltage compensation value and mobility offset.
Optionally, the compensation variable quantity of the threshold voltage is calculated by the following formula: Δ Vth=Δ N × t1, wherein
Δ Vth is the compensation variable quantity of the threshold voltage, and Δ N is the temperature change value, and t1 is the drive of the sub-pixel prestored
The threshold voltage variation with temperature amount of dynamic transistor；
The compensation variable quantity of the mobility is calculated by the following formula: Δ K=Δ N × t2, Δ K are the mobility
Variable quantity is compensated, Δ N is the temperature change value, and t2 is the mobility of the driving transistor of the sub-pixel prestored with temperature
Variable quantity.
Optionally, the compensation value calculation unit, for compensating table by searching for threshold voltage compensation table and mobility
Lattice obtain threshold voltage compensation value and mobility offset, include by reference threshold voltage in the threshold voltage compensation table
The threshold voltage compensation value Vth that the variable quantity of Vth1 and different threshold voltages obtains includes in the mobility compensation forms
The mobility offset K obtained by the variable quantity of reference mobility K1 and different mobilities.
Optionally, the compensated data voltage is calculated using following formula:
Wherein, Data ' is the compensated data voltage, and K is the mobility offset, and Vth is the threshold value electricity
Offset is pressed, L ' is the luma data that receives.
The present invention also provides a kind of display devices, including above-mentioned display compensation data device.
The advantageous effects of the above technical solutions of the present invention are as follows:
In the embodiment of the present invention, in the actual displayed stage of display device, consider temperature change to mobility and threshold value electricity
The influence of pressure, to obtain relatively accurate mobility offset and threshold voltage compensation value, to improve the picture of display device
Show quality.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below by institute in the description to the embodiment of the present invention
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without any creative labor, can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the electrical block diagram of the sub-pixel in some embodiments of the invention；
Fig. 2 is the change curve schematic diagram of mobility under different temperatures；
Fig. 3 is the change curve schematic diagram of different temperatures lower threshold voltages；
Fig. 4 is the flow diagram of the display compensation data method of one embodiment of the invention；
Fig. 5 is the signal of the threshold voltage variation with temperature amount and mobility variation with temperature amount of the embodiment of the present invention
Table；
Fig. 6 is the Id-Vg curve synoptic diagram of the driving transistor of one embodiment of the invention；
The waveform diagram of Fig. 7 each parameter when being the sensing reference threshold voltage of the embodiment of the present invention；
The waveform diagram of Fig. 8 each parameter when being the sensing reference mobility of the embodiment of the present invention；
The waveform diagram of Fig. 9 each parameter when being the sensing reference sensing voltage of the embodiment of the present invention；
Figure 10 is the flow diagram of the display compensation data method of another embodiment of the present invention；
Figure 11 is the structural schematic diagram of the display compensation data device of the embodiment of the present invention；
Figure 12 is the structural schematic diagram of the sequence controller of the embodiment of the present invention；
Figure 13 is the structural schematic diagram of the display device of one embodiment of the invention.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
Attached drawing, the technical solution of the embodiment of the present invention is clearly and completely described.Obviously, described embodiment is this hair
Bright a part of the embodiment, instead of all the embodiments.Based on described the embodiment of the present invention, ordinary skill
Personnel's every other embodiment obtained, shall fall within the protection scope of the present invention.
Display device in the embodiment of the present invention can be OLED display, and OLED display includes: that OLED is shown
Panel and driving element for driving the OLED display panel luminous, the OLED display panel includes scan line, data
Line, sense wire and multiple sub-pixels, referring to FIG. 1, Fig. 1 is the circuit structure signal of the sub-pixel in some embodiments of the invention
Figure, the circuit of the sub-pixel include: luminescent device OLED, driving transistor T1, switching transistor T2, sensing transistor T3 and deposit
Storage holds Cst, wherein and the control terminal of driving transistor T1 is connected to node G, and the first pole is connected to ELVDD (anode voltage), the
Two poles are connected to node S；The control terminal of switching transistor T2 is connected to scan line GL1, and the first pole is connected to data line DL, and second
Pole is connected to node G；The control terminal of sensing transistor T3 is connected to scan line GL2, and the first pole is connected to node S, and the second pole connects
It is connected to sense wire SL；The anode of luminescent device OLED is connected to node S, and cathode is connected to ELVSS (cathode voltage).Storage capacitance
The first pole of Cst is connected to node G, and the second pole is connected to node S.Certainly, Fig. 1 show the son in some embodiments of the invention
The circuit structure of pixel, in some other embodiment of the invention, the circuit of sub-pixel is also possible to other types.
In OLED display panel luminescence process, by data line DL to sub-pixel input data voltage, control driving is brilliant
Body pipe T1 is opened, and after driving transistor T1 is opened, luminescent device OLED shines, and the section of sub-pixel can be sensed by sense wire SL
Voltage at point S, thus according to the sensing voltage sensed, to the mobility and threshold voltage of the driving transistor T1 of sub-pixel
It compensates.
In OLED display panel luminescence process, the surface temperature of OLED display panel can be increased, and the raising meeting of temperature
Make that the mobility of transistor and threshold voltage is driven all to change, please refers to Fig. 2 and Fig. 3, Fig. 2 and Fig. 3 are under different temperatures
The change curve schematic diagram of mobility and threshold voltage, the change curve of Cong Tuzhong can be seen that the raising with temperature (T),
The mobility and threshold voltage for driving transistor can all become smaller.And in existing compensation way, not in view of temperature is to migration
The influence of rate and threshold voltage causes so that the mobility offset and threshold voltage compensation value using inaccuracy compensate
There is image retention in short-term in OLED display panel, and image quality reduces.
To solve the above problems, the embodiment of the present invention provides a kind of display compensation data method, display compensation data device
And display device considers influence of the temperature change to mobility and threshold voltage in the actual displayed stage of display device, with
To relatively accurate mobility offset and threshold voltage compensation value, to improve the image display quality of display device.
Referring to FIG. 4, the embodiment of the present invention provides a kind of display compensation data method, it is applied to display device, it is described aobvious
Showing device includes multiple sub-pixels, and each sub-pixel includes luminescent device and driving transistor, which comprises
Step 11: in the frame of the display device idle (Blanking) stage, Xiang Suoshu sub-pixel input test is shown
Data；
Frame idle phase refers to one section of free time between two frames.Because the frame free time between two frames is less than one
The time of frame, and it is 0.2S or so that the human eye time, which persists, is far longer than a frame time, therefore defeated to sub-pixel in frame free time
Enter test display data, does not influence normally to show.
Step 12: obtaining the actual sensed data by sensing after preset charged duration from the sub-pixel；
The actual sensed data are to sense to obtain by the corresponding sense wire of the sub-pixel.
Step 13: data, actual sensed data and the compensation reference data prestored are shown according to the test, determine described in
The temperature change value of sub-pixel；
Step 14: according to the threshold value of the temperature change value of the sub-pixel and the driving transistor of the sub-pixel prestored
Voltage variation with temperature amount and mobility variation with temperature amount calculate threshold voltage compensation value and mobility offset；
The threshold voltage variation with temperature amount and mobility variation with temperature of the driving transistor of the sub-pixel prestored
Amount can be with as shown in figure 5, in table shown in fig. 5, including every rising unit temperature (such as 1 DEG C), four sub-pixel (R pictures
Element, G sub-pixel, B sub-pixel and W sub-pixel) driving transistor threshold voltage variable quantity and mobility variable quantity.By
In the corresponding driving transistor of the sub-pixel of different colours may different (such as breadth length ratio is different) and there are test error, because
This, the threshold voltage variation with temperature amount and mobility variation with temperature amount of the driving transistor of the sub-pixel of different colours
There may be differences.
In the embodiment of the present invention, optionally, corresponding driving transistor can be prestored for each sub-pixel of display panel
Threshold voltage variation with temperature amount and mobility variation with temperature amount, it is of course also possible to which it is same to be that multiple pixels correspond to
Threshold voltage variation with temperature amount and same mobility variation with temperature amount, the embodiment of the present invention is without limitation.
Step 15: the stage is shown in the frame of the display device, according to the threshold voltage compensation value and the mobility
Offset is compensated to be output to the display data of the sub-pixel.
In the embodiment of the present invention, in the actual displayed stage of display device, consider temperature change to mobility and threshold value electricity
The influence of pressure, to obtain relatively accurate mobility offset and threshold voltage compensation value, to improve the picture of display device
Show quality.
In the embodiment of the present invention, the course of work of display device can be divided into test phase and actual displayed stage, survey
The examination stage is mainly used for the threshold voltage variation with temperature amount for determining the driving transistor of sub-pixel and mobility with temperature
Variable quantity and determining above-mentioned compensation reference data, and obtained in the actual displayed stage then according to as described in above-mentioned steps 11-15
The mobility offset and threshold voltage compensation value generated by temperature change, and the variation of mobility and threshold voltage is compensated,
To the image retention in short-term that compensation is generated by temperature factor, image quality is improved.
The course of work of test phase is illustrated below.
1.1 determine the threshold voltage variation with temperature amount and mobility variation with temperature of the driving transistor of sub-pixel
Amount
In the embodiment of the present invention, sub-pixel can be obtained by actual measurement in the test phase before display device factory
Driving transistor threshold voltage variation with temperature amount and mobility variation with temperature amount (such as it is every rising and/or under
1 DEG C of drop, the variable quantity of threshold voltage and the variable quantity of mobility).
It in some embodiments of the invention, can be by driving the Id-Vg (Drain current-Gate Voltage) of transistor bent
Line obtains the mobility and threshold voltage of driving transistor, referring to FIG. 6, Fig. 6 is the Id-Vg curve of a driving transistor, it can
The mobility and threshold voltage of driving transistor are obtained by Id-Vg curve and following formula:
Wherein, Vth is the threshold voltage for driving transistor, VGS(1)And VGS(2)For gate source voltage, IDS(1)And IDS(2)For drain-source
Electric current, μFEFor the mobility for driving transistor, COXFor gate oxide capacitance,For the breadth length ratio for driving transistor.
In some embodiments of the present invention, the threshold value electricity of the driving transistor of each sub-pixel of display panel can be sensed
Variation with temperature amount and mobility variation with temperature amount are pressed, and is recorded, subsequent practical compensation process is used for.When
So, can also only sensing part sub-pixel driving transistor threshold voltage variation with temperature amount and mobility with temperature
Variable quantity, to reduce sensing quantity, for example, only sensing the threshold voltage variation with temperature amount and mobility of multiple R sub-pixels
Variation with temperature amount, and by the multiple R sub-pixels being calculated driving transistor threshold voltage variation with temperature amount
It is averaged with mobility variation with temperature amount, obtains average value, all R sub-pixels for display panel.
It can only sense one if it is the display device of same model for the sensing of threshold voltage and mobility and show
Showing device or several display devices, and sensing result is used for other display devices with model.
1.2 determine compensation reference data based on compensating test
In the embodiment of the present invention, the compensation reference data prestored may include: the reference sense obtained in test phase
Measured data, and, in the reference mobility that test phase obtains.
In the embodiment of the present invention, in test phase, threshold value can be carried out using the method for shutdown compensation under assigned temperature
The compensating test of voltage and migration value.
The assigned temperature is usually room temperature (i.e. 25 DEG C).
The shutdown compensation refers to that display device shows black picture but does not power off.Since temperature is lower under black picture, move
Shifting rate and the sensing value of threshold voltage can be more acurrate.
Firstly, it is necessary to which the relatively accurate threshold voltage of sensing driving transistor (can also claim under the compensation way that shuts down
For reference threshold voltage), the threshold voltage sensed may be set to Vth1.Referring to FIG. 7, inputting display data to sub-pixel
Data is equal to Data by the value that sense wire senses sensing the data Vsense, Vth1 of sub-pixel and subtracts Vsense.
Secondly, being based on reference threshold voltage, relatively accurate mobility K (being referred to as with reference to mobility) is obtained, it can
The relationship for being set as K1, K1 and Data can refer to following formula:
Vsense=I × T=μ 1 × (Data+Vth1-Vth) ^2 × T
Wherein, Vsense is the sensing voltage of sub-pixel, and I is the electric current for driving transistor, and T is the charging for driving transistor
Time (i.e. above-mentioned preset charged duration), μ 1 are the actual migration rate for driving transistor, and Data is the display inputted to sub-pixel
Data, Vth1 are the threshold voltage sensed, and Vth is the actual threshold voltage for driving transistor, and ∝ is direct proportion function, LUT
For look-up-table function.Since Vth1 is the relatively accurate threshold voltage sensed, it is substantially equal to Vth.
According to above-mentioned formula, referring to FIG. 8, when sensing K1 Data+Vth1 can be inputted to sub-pixel, to be joined
Examine mobility K1.
Subsequently, at normal temperature, and by being migrated based on reference threshold voltage Vth1 and reference after preset charged duration
Rate K1 is obtained with reference to sensing data, referring to FIG. 9, can be obtained by following formula with reference to sensing data:
Wherein, V1 is with reference to sensing data, and I1 is the electric current for driving transistor, and T is preset charged duration, and μ 1 is that driving is brilliant
The actual migration rate of body pipe, K1 are the mobility sensed, and Vth1 is the threshold voltage sensed, and Vth is driving transistor
Actual threshold voltage, ∝ are direct proportion function, and L is the corresponding gradation data of Data.Due to Vth1 be sense it is relatively accurate
Threshold voltage, therefore be substantially equal to Vth.
According to above-mentioned formula, referring to FIG. 9, the display voltage inputted to sub-pixel is Data1 when obtaining V1,
In the embodiment of the present invention, the temperature change value in actual displayed stage can be calculated using following formula:
Wherein, Δ N is the temperature change value, and K1 is described with reference to mobility, and L is that test phase obtains reference threshold electricity
The gradation data inputted when pressure, V1 are described with reference to data are sensed, and V2 is the actual sensed data, and t1 is the son prestored
The threshold voltage variation with temperature amount of the driving transistor of pixel, t2 is moving for the driving transistor of the sub-pixel prestored
Shifting rate variation with temperature amount.
The derivation process of the calculation formula of above-mentioned temperature change value is described below.
In the actual displayed stage, display panel has fever phenomenon, to cause the temperature of display panel to increase, due to temperature
Degree variation, drives the actual migration rate of transistor and threshold voltage that can change.At this point it is possible in the frame in actual displayed stage
Idle phase senses actual sensed data V2 by the reference threshold voltage of shutdown compensation acquisition and with reference to mobility, practical to feel
Measured data can be obtained by following formula:
Wherein, V2 is actual sensed data, and I2 is the electric current for driving transistor, and T is preset charged duration, and μ 2 is that driving is brilliant
The actual migration rate of body pipe, K1 are with reference to mobility, and Δ Vth is the changing value of threshold voltage, and ∝ is direct proportion function, and L is
The corresponding gradation data of Data.
In the actual displayed stage, due to temperature change, mobility becomes μ 2 from μ 1, and threshold voltage becomes Vth from Vth
+ Δ Vth, and, be input to the display voltage of sub-pixel still according toApply, therefore, the V2 that senses
It is calculated using above-mentioned formula.
Based on above-mentioned formula (1), available following formula (3):
Wherein, K2 is the corresponding mobility offset of μ 2.
By formula (2) and formula (3), available formula (4):
Wherein, Δ K is the variable quantity of mobility.
To obtain the calculation formula of temperature change value:
Wherein, Δ N is the temperature change value, and K1 is described with reference to mobility, and L is that test phase obtains reference threshold electricity
The gradation data inputted when pressure, V1 are described with reference to data are sensed, and V2 is the actual sensed data, and t1 is the son prestored
The threshold voltage variation with temperature amount of the driving transistor of pixel, t2 is moving for the driving transistor of the sub-pixel prestored
Shifting rate variation with temperature amount.
It is described according to the temperature change value and the driving transistor of the sub-pixel prestored in the embodiment of the present invention
Threshold voltage variation with temperature amount and mobility variation with temperature amount calculate threshold voltage compensation value and mobility offset
Include:
Step 141: according to the threshold voltage of the temperature change value and the driving transistor of the sub-pixel that prestores with
The variable quantity and mobility variation with temperature amount of temperature obtain the compensation variable quantity of threshold voltage and the compensation variation of mobility
Amount；
Step 142: according to the compensation variable quantity of the compensation variable quantity and mobility of the threshold voltage, obtaining threshold voltage
Offset and mobility offset.
In the embodiment of the present invention, the compensation variable quantity of the threshold voltage is calculated by the following formula: Δ Vth=Δ N ×
T1, wherein Δ Vth is the compensation variable quantity of the threshold voltage, and Δ N is the temperature change value, and t1 is the son prestored
The threshold voltage variation with temperature amount of the driving transistor of pixel；
The compensation variable quantity of the mobility is calculated by the following formula: Δ K=Δ N × t2, Δ K are the mobility
Variable quantity is compensated, Δ N is the temperature change value, and t2 is the mobility of the driving transistor of the sub-pixel prestored with temperature
Variable quantity.
In the embodiment of the present invention, the compensation variable quantity of the compensation variable quantity and mobility according to the threshold voltage,
It obtains threshold voltage compensation value and mobility offset includes:
By searching for threshold voltage compensation table and mobility compensation forms, obtains threshold voltage compensation value and mobility is mended
Value is repaid, includes being obtained by the variable quantity of reference threshold voltage Vth1 and different threshold voltages in the threshold voltage compensation table
Threshold voltage compensation value Vth, include by the change of reference mobility K1 and different mobilities in the mobility compensation forms
Change the mobility offset K measured.
That is K=LUT (K1, Δ K), Vth=LUT (Vth1, Δ Vth), wherein LUT is look-up-table function.
In the embodiment of the present invention, the compensated data voltage is calculated using following formula:
Wherein, Data ' is the compensated data voltage, and K is the mobility offset, and Vth is the threshold value electricity
Offset is pressed, L ' is the luma data that receives.
Referring to FIG. 10, Figure 10 is the flow diagram of the display compensation data method of another embodiment of the present invention, this is aobvious
Registration includes test phase and actual displayed stage according to compensation method, comprising the following steps:
Step 21: the threshold voltage variation with temperature amount and mobility for obtaining the driving transistor of sub-pixel are with temperature
Variable quantity；
Step 22: the reference threshold voltage Vth1 of the driving transistor of sensing sub-pixel being compensated by shutdown and reference migrates
Rate K1；
Step 23: based on the reference threshold voltage Vth1 obtained when shutting down and compensating and referring to mobility K1, obtain reference and feel
Measured data V1；
Step 24: in the frame idle phase in actual displayed stage, based on reference threshold voltage Vth1 and mobility K1 is referred to,
Obtain actual sensed data V2；
Step 25: based on actual sensed data V2, with reference to sensing data V1, with reference to mobility K1 and threshold voltage with temperature
The variable quantity and mobility variation with temperature amount of degree, obtain the temperature change value Δ N of sub-pixel；
Step 26: according to institute temperature change value Δ N and threshold voltage variation with temperature amount and mobility with the change of temperature
Change amount obtains the compensation variable quantity of the compensation variable quantity and mobility of threshold voltage；
Step 27: according to the compensation variable quantity of mobility and referring to mobility, obtain mobility offset；
Step 28: according to the compensation variable quantity and reference threshold voltage of threshold voltage, obtaining threshold voltage compensation value；
Wherein, the execution order of step 27 and step 28 is unlimited, can first carry out step 27, then execute step 28, alternatively,
Step 28 is first carried out, step 27 is being executed, alternatively, two steps are performed simultaneously.
Step 29: the stage is shown in the frame of the display device, according to the threshold voltage compensation value and the mobility
Offset is compensated to be output to the display data of the sub-pixel.
Wherein, step 21,22 and 23 are executed in test phase, and step 23- step 29 executes in the actual displayed stage.
Based on the same inventive concept, Figure 11 is please referred to, the embodiment of the present invention also provides a kind of display compensation data device, answers
For display device, the display device includes multiple sub-pixels, and each sub-pixel includes luminescent device and driving crystal
Pipe, the display compensation data device include:
Data outputting unit 101, for the frame idle phase in the display device, Xiang Suoshu sub-pixel input test is aobvious
Registration evidence；
Data capture unit 102 is sensed, passes through what preset charged duration was sensed from the sub-pixel later for obtaining
Actual sensed data；
Temperature change value computing unit 103, for showing data, actual sensed data and the benefit prestored according to the test
Reference data is repaid, determines the temperature change value of the sub-pixel；
Compensation value calculation unit 104, for according to the temperature change value of the sub-pixel and the sub-pixel prestored
Drive transistor threshold voltage variation with temperature amount and mobility variation with temperature amount, calculate threshold voltage compensation value and
Mobility offset；
The data outputting unit 101 is also used to show the stage in the frame of the display device, according to the threshold voltage
Offset and the mobility offset, compensate to be output to the display data of the sub-pixel.
Optionally, the compensation reference data prestored includes:
Data are sensed in the reference that test phase obtains；With
In the reference mobility that test phase obtains.
Optionally, the data voltage supplement device of the embodiment of the present invention can also include: reference data computing unit, be used for
It calculates described with reference to sensing data and with reference to mobility.
Optionally, the temperature change value is calculated using following formula:
Wherein, Δ N is the temperature change value, and K1 is described with reference to mobility, and L is that test phase obtains reference threshold electricity
The gradation data inputted when pressure, V1 are described with reference to data are sensed, and V2 is the actual sensed data, and t1 is the son prestored
The threshold voltage variation with temperature amount of the driving transistor of pixel, t2 is moving for the driving transistor of the sub-pixel prestored
Shifting rate variation with temperature amount.
Optionally, the compensation value calculation unit 104, for according to the temperature change value and the sub-pixel prestored
Driving transistor threshold voltage variation with temperature amount and mobility variation with temperature amount, obtain the compensation of threshold voltage
The compensation variable quantity of variable quantity and mobility；According to the threshold voltage compensation variable quantity and mobility compensation variable quantity,
Obtain threshold voltage compensation value and mobility offset.
Optionally, the compensation variable quantity of the threshold voltage is calculated by the following formula: Δ Vth=Δ N × t1, wherein
Δ Vth is the compensation variable quantity of the threshold voltage, and Δ N is the temperature change value, and t1 is the drive of the sub-pixel prestored
The threshold voltage variation with temperature amount of dynamic transistor；
The compensation variable quantity of the mobility is calculated by the following formula: Δ K=Δ N × t2, Δ K are the mobility
Variable quantity is compensated, Δ N is the temperature change value, and t2 is the mobility of the driving transistor of the sub-pixel prestored with temperature
Variable quantity.
Optionally, the compensation value calculation unit 104, for being compensated by searching for threshold voltage compensation table and mobility
Table, obtains threshold voltage compensation value and mobility offset, includes by reference threshold electricity in the threshold voltage compensation table
The variable quantity obtained threshold voltage compensation value Vth of pressure Vth1 and different threshold voltages are wrapped in the mobility compensation forms
Include the mobility offset K obtained by the variable quantity of reference mobility K1 and different mobilities.
Optionally, the compensated data voltage is calculated using following formula:
Wherein, Data ' is the compensated data voltage, and K is the mobility offset, and Vth is the threshold value electricity
Offset is pressed, L ' is the luma data that receives.
Display compensation data device in the embodiment of the present invention can be sequence controller.
Figure 12 is please referred to, Figure 12 is the structural schematic diagram of the sequence controller of the embodiment of the present invention, the sequence controller packet
Include above-mentioned data outputting unit, sensing data capture unit, temperature change value computing unit, compensation value calculation unit and reference number
According to computing unit, while also there is timing sequence conversion unit.Figure 13 is please referred to, Figure 13 is the timing control with the embodiment of the present invention
The structural schematic diagram of the display device of device, the display device in the embodiment of the present invention includes display panel, sequence controller, storage
Device, source electrode driver and gate drivers.
It is said below with reference to data voltage compensation process of the Figure 12 and Figure 13 to the sequence controller of the embodiment of the present invention
It is bright:
Sequence controller receives externally input RGB data (even if gradation data), timing control signal (Timing
Control, TC), ROM (read-only memory) data stored in memory are read, while receiving the son of source electrode driver output
The sensing data SData (Sensing Data) of pixel；In the display operation stage, sequence controller generates display data
Data and source control signal SCS (Source Control Signal) is simultaneously exported to source electrode driver；Sequence controller generates
Grid control signal GCS (Gate Control Signal) is simultaneously exported to gate drivers, final to control the normal defeated of picture
Out.
In the frame idle phase of display device, sequence controller generates test display data Data and source control signal
SCS is simultaneously exported to source electrode driver；Sequence controller generates grid control signal GCS and exports to gate drivers, in grid
Actual sensed data SData is obtained under the cooperation of driver and source electrode driver.The driving that memory stores each sub-pixel is brilliant
The mobility offset variation with temperature value and threshold voltage variation with temperature value of body pipe, drive the reference threshold of transistor
Voltage Vth1, with reference to mobility K1, and, when obtaining when based on shutdown compensation with reference to mobility and reference threshold voltage, obtain
Reference sense data V1, at the same time it can also store the characteristic value (such as threshold voltage Voled) of luminescent device, luminescent device
Optical compensation characteristic value etc..
Source electrode driver receives display data Data and source control signal SCS, generates corresponding data voltage and passes through
DL (data line) is exported to display panel；It is idle in the frame in display stage by the control of source electrode driver and gate drivers
Stage, source electrode driver sense sub-pixel electrical characteristic value by SL (sense wire), generate corresponding sensing data Sense
Data (SData) is simultaneously exported to sequence controller.
Gate drivers receive grid control signal GCS, and generate corresponding Gate signal and pass through GL (scan line) signal
It exports to display panel.
In conjunction with Figure 12, the course of work of the sequence controller in the embodiment of the present invention be can be such that
The sensing data Sdata that reference data computing unit receives source electrode driver when shutting down compensation is obtained by calculating
To each sub-pixel compensation reference data and store into memory.
Data Computation Unit is sensed in the real-time display stage, receives the actual sensed data Sdata of source electrode driver, is passed through
Digital-to-analogue conversion etc., and export to temperature change value computing unit.
Temperature change value computing unit receives actual sensed data, reads and refers to offset data in memory, by meter
It calculates and generates temperature change value.
Compensation value calculation unit reads threshold voltage variation with temperature amount and mobility variation with temperature in memory
Amount, while the temperature change value of temperature change value computing unit output is received, calculate mobility offset and threshold voltage
Compensation variable quantity, output is to data outputting unit.
Compensation variable quantity of the data outputting unit based on RGB data, mobility offset and threshold voltage, to source drive
Device exports the display data Data through overcompensation.
The embodiment of the present invention also provides a kind of display device, including above-mentioned display compensation data device.
Unless otherwise defined, technical term or scientific term used in the present invention are should be in fields of the present invention
The ordinary meaning that personage with general technical ability is understood." first ", " second " used in the present invention and similar word
It is not offered as any sequence, quantity or importance, and is used only to distinguish different component parts." connection " or " connected "
It is not limited to physics or mechanical connection etc. similar word, but may include electrical connection, either directly
Or it is indirect."upper", "lower", "left", "right" etc. are only used for indicating relative positional relationship, when the absolute position for being described object
After setting change, then the relative positional relationship also correspondingly changes.
The above is a preferred embodiment of the present invention, it is noted that for those skilled in the art
For, without departing from the principles of the present invention, it can also make several improvements and retouch, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (17)
1. a kind of display compensation data method is applied to display device, the display device includes multiple sub-pixels, each described
Sub-pixel includes luminescent device and driving transistor, which is characterized in that the described method includes:
In the frame idle phase of the display device, Xiang Suoshu sub-pixel input test shows data；
Obtain the actual sensed data by sensing after preset charged duration from the sub-pixel；
Data, actual sensed data and the compensation reference data prestored are shown according to the test, determine the temperature of the sub-pixel
Spend changing value；
According to the threshold voltage of the temperature change value of the sub-pixel and the driving transistor of the sub-pixel prestored with temperature
Variable quantity and mobility variation with temperature amount, calculate threshold voltage compensation value and mobility offset；
Show that the stage treats according to the threshold voltage compensation value and the mobility offset in the frame of the display device
It exports to the display data of the sub-pixel and compensates.
2. display compensation data method as described in claim 1, which is characterized in that the compensation reference data packet prestored
It includes:
Data are sensed in the reference that test phase obtains；With
In the reference mobility that test phase obtains.
3. display compensation data method as claimed in claim 2, which is characterized in that the temperature change value uses following formula
It calculates:
Wherein, Δ N is the temperature change value, and K1 is described with reference to mobility, when L is that test phase obtains reference threshold voltage
The gradation data of input, V1 are described with reference to data are sensed, and V2 is the actual sensed data, and t1 is the sub-pixel prestored
Driving transistor threshold voltage variation with temperature amount, t2 be the sub-pixel prestored driving transistor mobility
Variation with temperature amount.
4. display compensation data method as claimed in claim 2, which is characterized in that the test phase is under assigned temperature
The compensating test of threshold voltage and migration value is carried out by the way of shutdown compensation.
5. display compensation data method as claimed in claim 2 or 4, which is characterized in that it is described with reference to sensing data by with
Lower method obtains:
In test phase sensing reference threshold voltage vt h1, wherein when sensing the reference threshold voltage, Xiang Suoshu sub-pixel
The display voltage of input is Data；
Data+Vth1 is inputted to the sub-pixel, is obtained with reference to mobility K1；
Data1 is inputted to the sub-pixel, whereinAnd it obtains and is filled by described preset
The reference sensing data V1 sensed after electric duration from the sub-pixel, wherein L is the corresponding gradation data of Data.
6. display compensation data method as described in claim 1, which is characterized in that described according to the temperature change value and pre-
The threshold voltage variation with temperature amount and mobility variation with temperature amount of the driving transistor for the sub-pixel deposited, calculate
Threshold voltage compensation value and mobility offset include:
According to the threshold voltage variation with temperature amount of the temperature change value and the driving transistor of the sub-pixel prestored
With mobility variation with temperature amount, the compensation variable quantity of the compensation variable quantity and mobility of threshold voltage is obtained；
According to the compensation variable quantity of the compensation variable quantity and mobility of the threshold voltage, threshold voltage compensation value and migration are obtained
Rate offset.
7. display compensation data method as claimed in claim 6, which is characterized in that
The compensation variable quantity of the threshold voltage is calculated by the following formula: Δ Vth=Δ N × t1, wherein Δ Vth is described
The compensation variable quantity of threshold voltage, Δ N are the temperature change value, and t1 is the threshold of the driving transistor of the sub-pixel prestored
Threshold voltage variation with temperature amount；
The compensation variable quantity of the mobility is calculated by the following formula: Δ K=Δ N × t2, Δ K are the compensation of the mobility
Variable quantity, Δ N are the temperature change value, and t2 is the mobility of the driving transistor of the sub-pixel prestored with the change of temperature
Change amount.
8. display compensation data method as claimed in claim 6, which is characterized in that the compensation according to the threshold voltage
The compensation variable quantity of variable quantity and mobility, obtains threshold voltage compensation value and mobility offset includes:
By searching for threshold voltage compensation table and mobility compensation forms, threshold voltage compensation value and mobility compensation are obtained
It is worth, includes being obtained by the variable quantity of reference threshold voltage Vth1 and different threshold voltages in the threshold voltage compensation table
Threshold voltage compensation value Vth includes by the variation of reference mobility K1 and different mobilities in the mobility compensation forms
The mobility offset K measured.
9. display compensation data method as described in claim 1, which is characterized in that under the compensated data voltage uses
State formula calculating:
Wherein, Data ' is the compensated data voltage, and K is the mobility offset, and Vth is threshold voltage benefit
Repay value, L ' is the luma data that receives.
10. a kind of display compensation data device is applied to display device, the display device includes multiple sub-pixels, Mei Yisuo
Stating sub-pixel includes luminescent device and driving transistor, which is characterized in that the display compensation data device includes:
Data outputting unit, for the frame idle phase in the display device, Xiang Suoshu sub-pixel input test shows data；
Data capture unit is sensed, for obtaining the actual sensed passed through and sensed after preset charged duration from the sub-pixel
Data；
Temperature change value computing unit, for being referred to according to the test display data, actual sensed data and the compensation prestored
Data determine the temperature change value of the sub-pixel；
Compensation value calculation unit, for according to the temperature change value of the sub-pixel and the driving crystal of the sub-pixel prestored
The threshold voltage variation with temperature amount and mobility variation with temperature amount of pipe, calculate threshold voltage compensation value and mobility is mended
Repay value；
The data outputting unit is also used to show the stage in the frame of the display device, according to the threshold voltage compensation value
With the mobility offset, compensated to be output to the display data of the sub-pixel.
11. display compensation data device as claimed in claim 10, which is characterized in that the compensation reference data packet prestored
It includes:
Data are sensed in the reference that test phase obtains；With
In the reference mobility that test phase obtains.
12. display compensation data device as claimed in claim 11, which is characterized in that the temperature change value uses following public affairs
Formula calculates:
Wherein, Δ N is the temperature change value, and K1 is described with reference to mobility, when L is that test phase obtains reference threshold voltage
The gradation data of input, V1 are described with reference to data are sensed, and V2 is the actual sensed data, and t1 is the sub-pixel prestored
Driving transistor threshold voltage variation with temperature amount, t2 be the sub-pixel prestored driving transistor mobility
Variation with temperature amount.
13. display compensation data device as claimed in claim 10, which is characterized in that
The compensation value calculation unit, for according to the temperature change value and the driving transistor of the sub-pixel prestored
Threshold voltage variation with temperature amount and mobility variation with temperature amount obtain the compensation variable quantity and mobility of threshold voltage
Compensation variable quantity；According to the compensation variable quantity of the compensation variable quantity and mobility of the threshold voltage, threshold voltage benefit is obtained
Repay value and mobility offset.
14. display compensation data device as claimed in claim 13, which is characterized in that
The compensation variable quantity of the threshold voltage is calculated by the following formula: Δ Vth=Δ N × t1, wherein Δ Vth is described
The compensation variable quantity of threshold voltage, Δ N are the temperature change value, and t1 is the threshold of the driving transistor of the sub-pixel prestored
Threshold voltage variation with temperature amount；
The compensation variable quantity of the mobility is calculated by the following formula: Δ K=Δ N × t2, Δ K are the compensation of the mobility
Variable quantity, Δ N are the temperature change value, and t2 is the mobility of the driving transistor of the sub-pixel prestored with the change of temperature
Change amount.
15. display compensation data device as claimed in claim 13, which is characterized in that
The compensation value calculation unit, for obtaining threshold value by searching for threshold voltage compensation table and mobility compensation forms
Voltage compensation value and mobility offset include by reference threshold voltage Vth1 and different in the threshold voltage compensation table
The threshold voltage compensation value Vth that the variable quantity of threshold voltage obtains includes by reference mobility in the mobility compensation forms
The mobility offset K that K1 and the variable quantity of different mobilities obtain.
16. display compensation data device as claimed in claim 10, which is characterized in that the compensated data voltage uses
Following formula calculate:
Wherein, Data ' is the compensated data voltage, and K is the mobility offset, and Vth is threshold voltage benefit
Repay value, L ' is the luma data that receives.
17. a kind of display device, which is characterized in that including the described in any item display data compensators of such as claim 10-16
Part.
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