CN109637444A - A kind of display device and its driving method - Google Patents
A kind of display device and its driving method Download PDFInfo
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- CN109637444A CN109637444A CN201910023946.2A CN201910023946A CN109637444A CN 109637444 A CN109637444 A CN 109637444A CN 201910023946 A CN201910023946 A CN 201910023946A CN 109637444 A CN109637444 A CN 109637444A
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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]
-
- 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
-
- 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
- G09G2320/04—Maintaining the quality of display appearance
- G09G2320/043—Preventing or counteracting the effects of ageing
- G09G2320/046—Dealing with screen burn-in prevention or compensation of the effects thereof
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/12—Test circuits or failure detection circuits included in a display system, as permanent part thereof
Abstract
The invention discloses a kind of display device and its driving methods, wherein display device includes multiple pixel circuits of multiple organic luminescent devices and driving organic luminescent device；The drive signal line connecting with pixel circuit, drive signal line are data line or reference voltage line；Detecting unit, detecting unit is used to pass through drive signal line to organic luminescent device output driving current, and and detect the voltage on the drive signal line, and then the voltage on the drive signal line detected twice determines the variable quantity of organic luminescent device anode voltage, then the voltage degradation in pixel circuit between drive transistor source drain electrode is obtained, it is compensated with the driving current in time to driving transistor, so that the driving current of organic luminescent device will not reduce with the increase of organic luminescent device voltage, realize the driving current of compensation organic luminescent device, the display brightness of organic light-emitting display device is set not will receive the increased influence of organic luminescent device voltage.
Description
Technical field
The present embodiments relate to field of display technology more particularly to a kind of display device and its driving methods.
Background technique
Organic Light Emitting Diode (Organic Light Emitting Diode, OLED) display device have self-luminous,
The advantages that wide viewing angle, therefore application in the field of display is also more and more extensive.
With the use of display device, OLED device gradually aging causes the voltage of OLED device to gradually increase, causes picture
The driving voltage of transistor is driven to be gradually reduced in plain circuit, so that driving current is gradually reduced, final display brightness is bright
Aobvious decline.Generally reverse bias alleviates OLED device aging speed by the when by OLED device and in the prior art, Huo Zhetong
Crossing backboard process means improves the characteristic of thin film transistor (TFT).
However, in the prior art by when OLED device and reverse bias only alleviate OLED device aging speed, backboard work
The improvement technique of skill means is again complex, so that there is no solved the problem of OLED display brightness declines at all.
Summary of the invention
The present invention provides a kind of display device and its driving method, to detect the anode voltage variation of organic luminescent device,
The data voltage for realizing compensation driving organic luminescent device solves to increase the display of display device because of the voltage of organic luminescent device
The problem of brightness declines.
In a first aspect, the embodiment of the invention provides a kind of display devices, comprising:
Multiple pixel circuits of multiple organic luminescent devices and driving organic luminescent device；
The drive signal line connecting with pixel circuit, drive signal line are data line or reference voltage line；
Detecting unit, detecting unit is used for through drive signal line to organic luminescent device output driving current, and is detected
Voltage on drive signal line.
Second aspect, the embodiment of the invention also provides a kind of driving method of display device, display device includes: multiple
Multiple pixel circuits of organic luminescent device and driving organic luminescent device；The drive signal line being connect with pixel circuit, driving
Signal wire is data line or reference voltage line；Detecting unit；
Driving method includes:
In sense mode, detecting unit passes through drive signal line to organic luminescent device output driving current, and detects drive
Voltage on dynamic signal wire.
The present invention provides display device and its driving method, which includes multiple organic luminescent devices, driving
The multiple pixel circuits of organic luminescent device, drive signal line and detecting unit, wherein drive signal line is data line or reference electricity
Crimping.Detecting unit detects drive to organic luminescent device output driving current, and by drive signal line by drive signal line
Dynamic signal wire, and then the change of organic luminescent device anode voltage can be determined according to the voltage on the drive signal line detected twice
Change amount, the variable quantity of organic luminescent device anode voltage are that the voltage in pixel circuit between drive transistor source drain electrode reduces
Amount is compensated with the driving current to driving transistor, so that being driven as caused by organic luminescent device voltage increase
The part that streaming current reduces is compensated, so that the driving current of organic luminescent device will not be with organic luminescent device voltage
Increase and reduce, realize compensation organic luminescent device driving current, make the display brightness of organic light-emitting display device will not
By the increased influence of organic luminescent device voltage, solves organic light-emitting display device brightness because of the voltage of organic luminescent device
The problem of increasing and declining.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of display device provided in an embodiment of the present invention；
Fig. 2 is a kind of flow chart of the driving method of display device provided in an embodiment of the present invention；
Fig. 3 is the equivalent circuit diagram of driving transistor driving organic luminescent device provided in an embodiment of the present invention；
Fig. 4 is the output characteristic curve of driving transistor provided in an embodiment of the present invention；
Fig. 5 is the structural schematic diagram of another display device provided in an embodiment of the present invention；
Fig. 6 is the flow chart of the driving method of another display device provided in an embodiment of the present invention；
Fig. 7 is the structural schematic diagram of another display device provided in an embodiment of the present invention；
Fig. 8 is the structural schematic diagram of another display device provided in an embodiment of the present invention；
Fig. 9 is the structural schematic diagram of another display device provided in an embodiment of the present invention；
Figure 10 is the flow chart of the driving method of another display device provided in an embodiment of the present invention；
Figure 11 is the structural schematic diagram of another display device provided in an embodiment of the present invention；
Figure 12 is a kind of driving method flow chart of display device provided in an embodiment of the present invention.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched
The specific embodiment stated is used only for explaining the present invention rather than limiting the invention.It also should be noted that in order to just
Only the parts related to the present invention are shown in description, attached drawing rather than entire infrastructure.
Fig. 1 is a kind of structural schematic diagram of display device provided in an embodiment of the present invention, with reference to Fig. 1, the display device packet
Include multiple pixel circuits 200 of multiple organic luminescent devices 100 and driving organic luminescent device 100；It is connect with pixel circuit 200
Drive signal line 300, drive signal line 300 be data line or reference voltage line；Detecting unit 400, detecting unit 400 are used for
By drive signal line 300 to 100 output driving current of organic luminescent device, and pass through the detecting driving letter of drive signal line 300
Voltage on number line 300.
Specifically, pixel circuit 200 is shone by driving transistor driving organic luminescent device 100, wherein pixel circuit
In 200 driving transistor generate driving current driving organic luminescent device 100 shine, organic luminescent device is organic light emission
Diode (Organic Light-Emitting Diode, OLED).When organic luminescent device 100 shines, anode usually passes through
The driving transistor of conducting or the first electricity that pixel circuit 200 is connected to by the driving transistor and switching transistor of conducting
Source voltage, cathode are connected to the second source voltage of pixel circuit 200, and the first supply voltage and second source voltage are usually fixed
Value, therefore, the electricity at the 100 cathode both ends of a pole and organic luminescent device that driving transistor is connect with the first signal voltage input terminal
Pressure is fixed and invariable.It, respectively can be big to accumulating in the two sides of 100 luminescent layer of organic luminescent device with the use of display device
Electrons and holes are measured, the gradually aging of organic luminescent device 100 causes the voltage of organic luminescent device 100 to gradually increase, causes to drive
Pressure difference between dynamic source transistor drain electrode reduces, and since the output characteristic curve of each transistor in pixel circuit 200 is not water
Flat, driving current can be reduced with the reduction of drive transistor source drain electrode pressure difference, eventually lead to organic luminescent device 100
Light emission luminance decline.
Such as the drive signal line 300 being connect with pixel circuit 200 be data line when, can be formed by pixel circuit 200
To the signal transmission passage of 100 anode of organic luminescent device, detecting unit 400 can be transmitted logical detecting unit 400 by the signal
Road provides driving current, and the voltage on detecting data line to organic luminescent device 100；The driving being connect with pixel circuit 200
When signal wire 300 is reference voltage line, other structures can be set by pixel circuit 200 or in display panel, such as can
Several transistors of control form signal transmission passage of the detecting unit 400 to 100 anode of organic luminescent device, detecting unit
400 provide driving current to organic luminescent device 100 by the signal transmission passage, detect the voltage on reference voltage line.It is logical
Cross the voltage on detecting drive signal line 300, available display device each 100 anode of organic luminescent device electricity before and after use
The variable quantity of position, and then the driving for flowing through organic luminescent device 100 can be obtained according to the output characteristic curve of driving transistor
The reduction amount of electric current, and then the driving current of organic luminescent device 100 is compensated in time, guarantee that the display of display device is bright
Degree will not decline.
The embodiment of the invention also provides a kind of driving method of display device, Fig. 2 is provided in an embodiment of the present invention one
The flow chart of the driving method of kind display device, the driving method can be used for driving display device shown in FIG. 1, illustratively,
With reference to Fig. 1 and Fig. 2, which includes:
S110, in sense mode, detecting unit 400 is by drive signal line 300 to 100 output driving of organic luminescent device
Electric current, and the voltage on drive signal line 300 is detected by drive signal line 300.
Under sense mode, detecting unit 400 can be by drive signal line 300 to the anode of each organic luminescent device 100
Output driving current, and pass through the anode voltage of the detecting organic luminescent device 100 of drive signal line 300.For example, can show
Before device factory and in use process, the voltage on drive signal line 300 is detected by detecting unit 400 respectively, according to detecing
The voltage on drive signal line twice 300 surveyed, obtains the variable quantity of 100 anode voltage of organic luminescent device, specifically can be
The incrementss of anode voltage, because driving the first extremely usual electric connection of power supply voltage in transistor in pixel circuit 200, second is extremely defeated
Driving current out drives the first pole and the second pole source-drain electrode each other of transistor, driving to the anode of organic luminescent device 100
The voltage at 100 cathode both ends of the first pole of transistor and organic luminescent device immobilizes, 100 anode voltage of organic luminescent device
Incrementss are equal to the reduction amount that the source-drain electrode pressure difference of transistor is driven in pixel circuit 200, and then can be according to driving transistor
Source-drain electrode pressure difference reduction amount the driving current of driving transistor is compensated, and then guarantee that driving current will not be with aobvious
Showing device uses, and reduces because the voltage of organic luminescent device increases, the light emission luminance of organic luminescent device 100 is protected
Hold it is constant, solve the problems, such as with display device using organic luminescent device voltage increase and occur display brightness decline,
Improve display effect.
Detecting unit 400, to 100 output driving current of organic luminescent device, is detectd twice by drive signal line 300
It surveys, such as successively, detecting is primary after factory for detecting before factory.Process is detected twice at this, and the electric current that detecting unit 400 exports is not
Become, the pressure difference of the device on signal transmission passage does not become VD(such as pressure drop on signal transmission passage on transistor), sampling
Voltage on circuit sampling to each data line, then the voltage of double sampling is respectively V2=VOLED2+VD
V1=VOLED1+VD
ΔVOLED=V2-V1=(VOLED2+VD)-(VOLED1+VD)=VOLED2-VOLED1
Wherein, V2The voltage on data line detected for second of detecting process, VOLED2For second of detecting process, have
100 anode voltage of machine luminescent device；V1To detect the voltage on the data line that process detects, V for the first timeOLED1To detect for the first time
Survey process, 100 anode voltage of organic luminescent device.According to above formula it is found that after voltage on sampling circuit samples to each data line,
Make the difference the anode voltage variation delta V that organic luminescent device 100 can be obtainedOLED。
Fig. 3 is the equivalent circuit diagram for driving transistor driving organic luminescent device, is driven when display device is normally shown brilliant
Body pipe Tr generates driving current ID, driving current IDOrganic luminescent device 100 is flowed through, organic luminescent device 100 can shine.
Since the first supply voltage ELVDD and second source voltage ELVSS are fixed voltage, so 100 voltage of organic luminescent device
Value added is equal to the V of driving transistor TrSD(source electrode and drain electrode voltage difference) decreasing value.Therefore, twice obtained in detecting process
Voltage change Δ V on data lineSxEqual to the value added of the anode voltage of organic luminescent device 100, it is also equal to driving crystal
The source-drain electrode pressure difference of pipe Tr becomes decreasing value Δ VSD, formula is as follows:
ΔVSx=Δ VOLED=Δ VSD
Fig. 4 is that curve is the output characteristic curve for driving transistor.Since TFT technique and MOS-FET process variations are very big,
So the saturation region curve of driving transistor does not measure up, this is also the source-drain electrode pressure difference V for driving transistorSDReduction will cause ID
The basic reason to become smaller.By output characteristic curve figure it is found that gate source voltage difference V different in saturation regionGSCorresponding curve is basic
In parallel, defining saturation region introversion line slope is KS, which can be by largely driving I-V (current versus voltage) data of transistor
It is calculated.A point is the operating point of driving transistor Tr when detecting for the first time (such as before factory) in Fig. 4；B point is to detect for the second time
The operating point of driving transistor after the voltage of organic luminescent device 100 rises when survey (such as after product export)；C point is this case
The operating point desired driving transistor Tr after compensation, the corresponding electric current I of C pointDSize it is equal with A point.
So B point electric current decreasing value Δ I are as follows:
Δ I=KS·(VDS1-VDS0)=KS·ΔVSx
The driving current for driving transistor Tr to generate are as follows:
ID=K (ELVDD-VDATA-Vth)2,
Whereinμ is carrier mobility, and Cox is gate oxide capacitance (gate oxide unit plane
Capacitor in product), W/L is the breadth length ratio for driving transistor Tr, and Vth is the threshold voltage for driving transistor Tr, VDATABefore compensation
Data voltage (input driving transistor Tr grid voltage)；
Then backoff algorithm formula are as follows:
V′DATAFor compensated data voltage.
It should be noted that in the pixel circuit of some display devices, can threshold voltage to driving transistor Tr into
Row compensation, then drive the current formula of transistor Tr are as follows:
ID=K (ELVDD-VDATA)2
Compensated algorithmic formula are as follows:
Fig. 5 is the structural schematic diagram of another display device provided in this embodiment, in the display device, detecting unit
400 include current source 410, sample circuit 420, gating circuit 430 and analog to digital conversion circuit 440；
Gating circuit 430 includes multiple gating subelements 431, and each gating subelement 431 includes current input terminal A, electricity
Output end B and sampled voltage output end C is flowed, the current input terminal A of each gating subelement 431 is electrically connected with current source 410, often
The current output terminal B electrical connection corresponding with data line 310 of a gating subelement 431；
Sample circuit 420 includes multiple input terminal E and multiple output end F, multiple input terminal E of sample circuit 420 and more
The sampled voltage output end C of a sample strobe subelement 431 corresponds electrical connection, the output end F and modulus of sample circuit 420
Conversion circuit 440 be electrically connected, sample circuit 420 be used for corresponding electrical connection gating subelement 431 be connected when, to this
The voltage on data line 310 that gating subelement 431 is electrically connected is sampled.
Because including many organic luminescent devices 100 in display device, the voltage of each organic luminescent device 100 all can be with
The use of display device and become larger, and the voltage change of each organic luminescent device 100 may be different, therefore can have to each
The anode voltage variable quantity of machine luminescent device 100 is successively detected, and according to the anode of the organic luminescent device 100 detected
Voltage variety compensates the driving current for driving organic hair luminescent device.Gating circuit 430 includes multiple gating
Unit 431 is connected in any gating subelement 431, gates the current output terminal B and current input terminal A of subelement 431 and adopts
It is connected between sample voltage output end C, the electric current that current source 410 exports flow to electricity through the current input terminal A of the gating subelement 431
Output end B is flowed, and the drive signal line 300 by connecting with the gating subelement 431 flow to the sun of organic luminescent device 100
Pole.The drive signal line 300 can be data line 310, such as conducting or pass by each transistor in control pixel circuit 200
The disconnected access formed between gating 431 current output terminal B of subelement and 100 anode of organic luminescent device；Or pass through display surface
Device in plate in addition to pixel circuit 200 forms gating 431 current output terminal B of subelement and 100 anode of organic luminescent device
Between access.Gating subelement 431 includes sampled voltage output end C, and sampled voltage output end C is chosen as and organic light emission
The identical position of 100 anode voltage current potential of device, the sampling electricity that sample circuit 420 passes through its input terminal and gating subelement 431
Press output end C electrical connection, can by acquire it is each gating subelement 431 sampled voltage output end C or with each gating subelement
Voltage value on the data line 310 of 431 electrical connections obtains the anode voltage of each organic luminescent device 100.
The embodiment of the invention also provides the driving method of another display device, which can be used for driving Fig. 5
The display device, with reference to Fig. 5 and Fig. 6, which includes:
S210, in sense mode, control multiple gating subelements 431 and sequentially turn on, sample circuit 420 is to data line 310
On voltage successively sampled, during one of gating subelement 431 is connected, other gating subelements 431 are turned off.
Illustratively, display device provided in an embodiment of the present invention is additionally provided with multi-strip scanning line (not shown), a plurality of to sweep
It retouches line to arrange along Y-direction, and extends in X direction.By taking drive signal line 300 in Fig. 5 is data line as an example, it is assumed that have the scanning of M row
Line and N data line, N number of gating subelement 431, in X direction, respectively first gating subelement, second gating
Unit ..., n-th gate subelement, the first horizontal scanning line export scanning signal, the first row pixel circuit 200 formed choosing
The signal transmission passage of logical 431 current output terminal B of subelement to 100 anode of organic luminescent device is connected, and controls first to N
A gating subelement 431 sequentially turns on, and during a gating subelement 431 is connected, other gating subelements 431 are turned off.?
What is formed in the first row pixel circuit 200 gates the signal of 431 current output terminal B of subelement to 100 anode of organic luminescent device
During transmission channel is connected, when first gating subelement 431 is connected, sampling unit 420 can pass through first gating
Unit 431 acquires the anode voltage of (1) (1) a organic luminescent device (the 1st row the 1st arranges an organic luminescent device 100)；?
When the conducting of two gating subelements 431, sampling unit 420 can by second gate that subelement 431 acquires to (1)
(2) anode voltage of a organic luminescent device (the 1st row the 2nd arranges an organic luminescent device 100) so realizes that the first row has one by one
The sampling of the anode voltage of machine luminescent device 100.In 431 electric current of the gating subelement output that the second row pixel circuit 200 is formed
During the signal transmission passage for holding B to 100 anode of organic luminescent device is connected, the anode electricity of the second row organic luminescent device is realized
The detecting of sampling one by one of the anode voltage of each organic luminescent device 100 in display device so may be implemented, in turn in the sampling of pressure
The anode voltage of each organic luminescent device 100 in whole display device is obtained, and can detected respectively, before obtaining factory
The anode voltage variable quantity of each organic luminescent device 100 afterwards drives the source and drain of the driving transistor of each organic luminescent device 100
The reduction amount of extreme pressure difference, to accurately be compensated to each 100 driving current of organic luminescent device, so that entire display dress
The display brightness for setting interior each organic luminescent device 100 can remain unchanged, and guarantee that the display brightness of display device will not be with
The voltage of organic luminescent device 100 increase and reduce, solve to use with display device, the voltage raising of organic luminescent device
And the problem of display brightness decline of appearance, improve display effect.
Fig. 7 is the structural schematic diagram of another display device provided in an embodiment of the present invention, with reference to Fig. 7, in above scheme
On the basis of, optionally, gating subelement 431 includes the first gating switch 4311 and the second gating switch 4312, the first gating
Switch 4311 and the second gating switch 4312 include first end, second end and control terminal, the first end of the first gating switch 4311
As the current input terminal A of the gating subelement 431, the second end electricity of the first gating switch 4311 and the second gating switch 4312
Connection forms common end, current output terminal B of the common end as the gating subelement 431, and the first of the second gating switch 4312
Hold the sampled voltage output end C as the gating subelement 431.
What the first gating switch 4311 and the second gating switch 4312 were chosen as simultaneously turning on and simultaneously turn off.When gating
When unit 431 is connected, the first gating switch 4311 and the second gating switch 4312 are all connected, and the electric current that current source 410 exports can
It flow to the current output terminal B of the gating subelement 431 by the first gating switch 4311, and is flow to by drive signal line 300
The anode of organic luminescent device 100, sample circuit 420 can be by the first ends of the second gating switch 4312, i.e. gating is single
The voltage of the sampled voltage output end C of member 431 obtains the anode voltage of organic luminescent device 100.
Continue to join Fig. 7, sample circuit 420 may include first capacitor C1, the first pole of first capacitor C1 and sample circuit 420
Input terminal and output end electrical connection, first capacitor C1 the second pole ground connection.
Specifically, each first capacitor C1 can correspond to a gating subelement 431, and pass through the first pole and sample circuit
420 input terminal and output end electrical connection is electrically connected when the moment that any gating subelement 431 disconnects with the gating subelement 431
The anode potential of the organic luminescent device 100 connect is stored in first capacitor C1, is realized to organic luminescent device 100 anode electricity
The sampling of pressure.
With continued reference to Fig. 7, detecting unit 400 further includes multiple third gating switches 440, multiple third gating switches 440
The output end one-to-one correspondence of first end and multiple sample circuits 420 be electrically connected, the second end and mould of each third gating switch 440
Number conversion circuit 440 is electrically connected.
Illustratively, after the conducting of all gating subelements 431, i.e. the anode potential of a line organic luminescent device 100
After all being finished by the sampling of sample circuit 420, successively controls third gating switch 440 and be connected, in the conducting of any gating switch,
The shutdown of other gating switches, and then mould successively is carried out to the anode voltage of the collected organic luminescent device 100 of sample circuit 420
Number conversion is provided conveniently with carrying out data processing for the driving chip inside display device.
Display device provided in this embodiment, setting gating circuit includes multiple gating subelements, and sampling includes multiple defeated
Enter end and multiple output ends, and by multiple gating subelements being controlled and being sequentially turned on, sample circuit is to data line in sense mode
On voltage successively sampled, during one of gating subelement conducting, other gating subelements shutdowns are, it can be achieved that aobvious
The detecting one by one of each organic luminescent device anode voltage in showing device, and then accurately to each organic luminescent device driving current
Compensate so that the display brightness of each organic luminescent device can remain unchanged in whole display device, solve with
The problem of display device is declined using the display brightness that the voltage of organic luminescent device increases and occurs, improves display effect.
Fig. 8 is the structural schematic diagram of another display device provided in an embodiment of the present invention, it should be noted that Fig. 8
It is the pixel circuit schematically illustrated in display device.With reference to Fig. 8, pixel circuit 200 include the 4th transistor T4,
5th transistor T5 (driving transistor), the 6th transistor T6, the 7th transistor T7, the 8th transistor T8, the 9th transistor T9
With the second capacitor C2；The anode of each organic luminescent device 100 and 200 phase of pixel circuit for driving the organic luminescent device 100
The data line D1 of connection is electrically connected by the 4th transistor T4, the 5th transistor T5 and the 6th transistor T6；4th transistor T4
Grid be electrically connected with the second scan line Sn2, the electrical connection corresponding with a data line D1 of the first pole of the 4th transistor T4, the 4th is brilliant
The second pole of body pipe T4 is electrically connected with the first pole of the 5th transistor T5；Grid and light emitting control line the EM electricity of 6th transistor T6
Connection, the first pole of the 6th transistor T6 is electrically connected with the second pole of the 5th transistor T5, the second pole of the 6th transistor T6 and
The anode of organic luminescent device 100 is electrically connected；The grid of 7th transistor T7 is electrically connected with third scan line Sn3, the 7th crystal
The first pole of pipe T7 is electrically connected with the grid of the 5th transistor T5, the second pole of the 7th transistor T7 and one article of reference voltage line
The corresponding electrical connection of Vref；The grid of 8th transistor T8 is electrically connected with light emitting control line EM, the first pole of the 8th transistor T8 with
First level line ELVDD electrical connection, the second pole of the 8th transistor T8 is electrically connected with the first pole of the 5th transistor T5；9th is brilliant
The grid of body pipe T9 is electrically connected with the second scan line Sn2, the first pole of the 9th transistor T9 and the grid electricity of the 5th transistor T5
Connection, the second pole of the 9th transistor T9 is electrically connected with the second pole of the 5th transistor T5；The first pole of second capacitor C2 and the
One level line ELVDD electrical connection, the second pole of the second capacitor C2 is electrically connected with the grid of the 4th transistor T4.
Under sense mode, detecting unit 400 detects the anode potential of organic luminescent device 100, scans to third
Line Sn3 exports low level scanning signal, third transistor T3 and the 7th transistor T7 conducting, exports to the second scan line Sn2
Low level scanning signal, the 4th transistor T4, the 5th transistor T5 and the 6th transistor T6 conducting, can specifically be controlled by scanning
Driving unit (not shown) processed exports scanning signal to the second scan line Sn2 and third scan line Sn3, scan control driving
Unit can be shift-register circuit.First gating switch 4311 and the conducting of the second gating switch 4312, current source 410 export
Electric current pass sequentially through the first gating switch 4311, data line D1, conducting the 4th transistor T4, the 5th transistor T5 and the 6th
Transistor T6 flow to the anode of organic luminescent device 100, sample circuit 400 by the sampling to voltage on data line, realize by
A carry out voltage sample, that is, the voltage of B point are stored in corresponding capacitor C1, after third gating switch 450 is closed, analog-to-digital conversion
Circuit 440 obtains the voltage on data line after converting, by the sampling of process more than twice, available organic luminescent device
100 anode potential variation.
Current source 410 is constant-current source.The electric current that current source 410 exports is certain, therefore the 4th transistor T4, the 5th transistor
The source-drain electrode pressure difference of T5 and the 6th transistor T6 are definite value.For example, the voltage on the data line that definition samples for the first time is V1, the
Voltage on the data line of double sampling is V2, and 100 anode voltage of organic luminescent device is VOLED1 when detecting for the first time, second
100 anode voltage of organic luminescent device is VOLED2 when secondary detecting, the source-drain electrode pressure difference of the 4th transistor T4 when detecting twice
For VSD4, the source-drain electrode pressure difference of the 5th transistor T5 is VSD5, and the source-drain electrode pressure difference of the 6th transistor T6 is VSD6, then voltage closes
System are as follows:
V1=VOLED1+VSD4++VSD5+VSD6
V2=VOLED2+VSD4++VSD5+VSD6
With continued reference to Fig. 2, due to organic luminescent device 100 when shining in the stage of display the first level line ELVDD and second
Voltage on level line ELVSS is fixed voltage, so 100 voltage value added of organic luminescent device is substantially equal to the 5th crystalline substance
The V of body pipe T5SD(source electrode and drain electrode voltage difference) decreasing value.Therefore, the voltage change Δ on the data line detected twice
VSxEqual to the value added of 100 anode voltage of organic luminescent device, it is also equal to drive transistor T5 when organic luminescent device 100 shines
Source-drain electrode pressure difference decreasing value:
ΔVSx=Δ VOLED=Δ VSD
Fig. 3 is the output characteristic curve for driving transistor.A point is the 5th when detecting for the first time (such as before factory) in Fig. 3
The operating point of transistor T5；After the voltage of organic luminescent device 100 rises when (such as after product export) B point is second of detecting
The 5th transistor T5 operating point；C point is the operating point desired 5th transistor T5 after this case compensation, the corresponding electric current of C point
IDSize it is equal with A point.
So B point electric current decreasing value Δ I are as follows:
Δ I=KS·(VDS1-VDS0)=KS·ΔVSx
The driving current that 5th transistor T5 is generated are as follows:
ID=K (ELVDD-VDATA)2,
Whereinμ is carrier mobility, and Cox is gate oxide capacitance (gate oxide unit plane
Capacitor in product), W/L is the breadth length ratio for driving transistor Tr, and Vth is the threshold voltage of the 5th transistor T5, VDATABefore compensation
Data voltage；
Then compensated algorithmic formula are as follows:
Fig. 9 is the structural schematic diagram of another display device provided in an embodiment of the present invention, and with reference to Fig. 9, optionally, this is aobvious
Showing device further includes viewing area 10 and non-display area, wherein is viewing area 10 in dotted line frame, is non-display area other than dotted line frame.
Non-display area is provided with multiple the first transistor T1 and multiple the first transistor T2, and pixel circuit 200 is set to viewing area；With reference to
One end of pressure-wire is electrically connected to pixel circuit 200, and the second end of reference voltage signal line is electrically connected by a first transistor T1
Connect reference voltage input terminal；Pixel circuit 200 includes third transistor T3, and the anode of organic luminescent device 100 passes through third crystalline substance
Body pipe T3 is electrically connected reference voltage line；The first pole and the second pole of the first transistor T2 is electrically connected pixel circuit 200 and is electrically connected
The data line and reference voltage line connect.
Display device may include the first driving unit 910, the second driving unit 920 and scan control driving unit 930,
One driving unit 910, the second driving unit 920 and scan control driving unit 930 can be shift-register circuit, and first is brilliant
The grid of body pipe T1 is electrically connected with by signal wire with the first driving unit 910, and the first transistor T1 is in the first driving unit 910
It is connected or turns off under the control of the control signal of input；The grid of second transistor T2 is electrically connected with the second driving unit 920,
Second transistor T2 is connected under the control for the control signal that the second driving unit 920 inputs or shutdown；Third transistor T3
Grid be electrically connected with scan control driving unit 930, the control that third transistor T3 is inputted in scan control driving unit 930
It is connected or turns off under the control of signal.
Figure 10 is the flow chart of the driving method of another display device provided in an embodiment of the present invention, which can
For driving display device shown in fig. 5, with reference to Fig. 6, which includes:
S310, it is turned off in sense mode, control the first transistor T2 and third transistor T3 conducting, the first transistor T1；
When S320, the first transistor T2 and third transistor T3 are connected, electrical connection corresponding with the first transistor T2 is controlled
Gating subelement 431 be connected；
S330, sample circuit 420 successively sample the voltage on data line.
It is said so that the first transistor T1, the first transistor T2 and third transistor T3 are P-type transistor as an example below
It is bright.Under sense mode, the first driving unit is by grid input high level signal of the signal wire to each the first transistor T1, and first
Transistor T1 shutdown, each reference voltage line is not to pixel single channel input reference voltage signal.Specifically, when scanning each row pixel,
Scan control driving unit 930 inputs low electricity to the grid of third transistor T3 by scan line S1, S2, S3, S4 ... respectively
Ordinary mail number, the corresponding third transistor T3 conducting of sub-pixel in the row；Third transistor T3 conducting is corresponded in every a line sub-pixel
When, the second driving unit 920 is successively inputted to the grid of each the first transistor T2 by signal wire N1, N2, N3, N4 ... respectively
Low level signal sequentially turns on each the first transistor T2, and any signal wire input being electrically connected with the second driving unit 920 is low
When level signal, other signal wire input high level signals being electrically connected with the second driving unit 920.It can control and be connected at this time
The gating subelement 431 of the corresponding electrical connection of the first transistor T2 be connected, the electric current that current source 410 exports then passes through first crystal
Pipe T2 and third transistor T3 flow to the organic luminescent device 100 of electrical connection corresponding with third transistor T3, and sample circuit 420 is logical
Cross the voltage acquired on data line corresponding with the organic luminescent device 100.
Specifically, current source 410 is constant-current source.The electric current that current source 410 exports is certain, therefore the first transistor T2 and the
The source-drain electrode pressure difference of three transistor T3 is definite value, therefore is detected twice to the voltage on data line to having, and detects power supply twice
The electric current that source 410 exports is identical, and defining the voltage variety on data line is Δ VSx, the change of 100 anode potential of organic luminescent device
Change amount is Δ VOLED, it is Δ V that the source-drain electrode pressure difference variable quantity of transistor is driven in pixel circuitSD, then voltage relationship are as follows:
ΔVSx=Δ VOLED=Δ VSD
The process for calculating compensated data voltage is identical as the calculation method of the various embodiments described above of the present invention, herein no longer
It repeats.
Figure 11 is the structural schematic diagram of another display device provided in an embodiment of the present invention, with reference to Figure 11, detecting unit
400 are integrated in driving chip 1000, and driving chip 1000 includes multiple data voltage output ends, the electricity of each gating subelement
Stream output end is electrically connected by a first switch 500 with data voltage output end；
Each data voltage output end is electrically connected a data line or each data voltage output end passes through multi-path choice
Device is electrically connected at least two data lines；
Driving chip 1000 further includes display driver element 600, and display driver element 600 includes multiple output ends, each
The output end of driving unit is electrically connected by a second switch 700 with data voltage output end.
Specifically, anode potential of the detecting unit 400 by each organic luminescent device 100 of detecting, driving chip 1000
Calculate the driving current that each transistor needs to compensate accordingly, display driver element 600 can be by adjusting data voltage to respectively having
The driving current of machine luminescent device compensates.
1 is continued to refer to figure 1, optionally, display device further includes data processing unit 800, and data processing unit 800 is distinguished
It is electrically connected with detecting unit 400 and display driver element 600；
Under sense mode, first switch 500 is connected, and second switch 700 turns off, and data processing unit 800 is for detecting
Under mode, the organic luminescent device anode voltage difference twice detected under same driving current according to detecting unit 400 is true
Fixed compensated data voltage；Under display pattern, second switch 700 is connected, and first switch 500 turns off, and driving chip 1000 is used
It exports in by compensated data voltage to data line.
Specifically, the operating mode of display device may include sense mode and display pattern, under sense mode, first is opened
500 conductings are closed, second switch 700 turns off, and sample circuit can be under same driving current to the anode electricity of each organic luminescent device
Position is sampled；Under display pattern, second switch 700 is connected, and second switch 700 is connected, and driving chip 1000 can pass through data
Line is to each 100 output data voltage of organic luminescent device.
Figure 12 is a kind of driving method flow chart of display device provided in an embodiment of the present invention.The driving method can be used for
Display device shown in Figure 11 is driven, which includes:
S410, sense mode, first switch 500 are connected, and second switch 700 turns off, 400 detecting data voltage of detecting unit
The voltage of output end, and by the voltage transmission of the data voltage output end detected to data processing unit 800；Data processing list
Member 800 determines organic luminescent device anode electricity according to the voltage for the output end of data voltage twice detected under same driving current
Pressure difference (voltage variety), and then determine compensated data voltage, determine organic luminescent device anode voltage variable quantity
Method can refer to the description of above embodiment；
Compensated data voltage is calculated using following formula:
Wherein, VDATA' it is compensated data voltage；ELVDD is the electricity that drive transistor source pole is inputted in pixel circuit
Pressure；KSFor transistor in pixel circuit output characteristic curve saturation region slope；ΔVSxTo be detected under same driving current
Organic luminescent device anode voltage difference twice；K is constant；VDATAFor the data voltage before compensation；
Optionally, the driving method further include:
Detecting unit 400 detects the voltage on drive signal line respectively before factory and after factory.
Illustratively, with reference to Figure 11, defining the voltage after display device is dispatched from the factory on data line is VSx1, organic luminescent device
Anode potential is VOLED1, the source-drain electrode pressure difference of third transistor T3 is VSD31, the source-drain electrode pressure difference of the first transistor T2 is
VSD21, then voltage relationship are as follows:
VSx1=VOLED1+VSD31+VSD21
Defining the voltage after display device is dispatched from the factory on data line is VSx0, organic luminescent device anode potential is VOLED0, third
The source-drain electrode pressure difference of transistor T3 is VSD30, the source-drain electrode pressure difference of the first transistor T2 is VSD20, then voltage relationship are as follows:
VSx=VOLED0+VSD30+VSD20
Before and after then dispatching from the factory, the voltage difference on data line is Δ VSx=VSx1-VSx0=VOLED1-VOLED0=Δ VOLED, that is, count
It is the variation of organic luminescent device anode potential according to the potential change on line.
Because the output characteristic curve of transistor in pixel circuit does not measure up in saturation region, cause driving current with driving
The reduction of source transistor drain electrode pressure difference, defining saturation region introversion line slope is KS, which can be by a large amount of transistor current-voltage
Data are calculated.Because the reduction amount of drive transistor source drain electrode pressure difference is equal to the incrementss of organic luminescent device anode potential,
I.e.
ΔVSD=Δ VOLED=Δ VSx
It can obtain accordingly,
Flow through the reduction amount of the driving current of organic luminescent device are as follows:
Δ I=KS·ΔVSx；
According to the electric current calculation formula I of organic luminescent deviceD=K (ELVDD-VDATA)2, whereinμ
For carrier mobility, Cox is gate oxide capacitance (capacitor on gate oxide unit area), and W/L is driving transistor
Breadth length ratio can obtain,
Compensated data voltage are as follows:
S420, display pattern, first switch 500 turn off, and second switch 700 is connected, after display driver element 600 will compensate
Data voltage be transmitted to data line.
Under display pattern, display driver element 600 can be by the calculated compensated data voltage of data processing unit 800
It exports to the pixel circuit 200 of corresponding organic luminescent device 100, so that driving the driving electricity of transistor in pixel circuit 200
Stream is compensated, and solves to use with display device, and the display brightness that the voltage of organic luminescent device increases and occurs declines change
Dark problem improves display effect.
1 is continued to refer to figure 1, organic luminescent device includes red device, green device and blue-light device；
In sense mode, control multiple gating subelements and sequentially turn on, sample circuit to the voltage on data line successively into
Row sampling, during one of gating subelement conducting, other gating subelement shutdowns, comprising:
To the gate input control signal of the first transistor T1 of electrical connection corresponding with red device column, control with it is red
The first transistor T1 conducting of the corresponding electrical connection of optical device column；The data that sample circuit pair is connect with red device column
Voltage on line is successively sampled；
To the gate input control signal of the first transistor T1 of the corresponding electrical connection of green device column, control and green light
The first transistor T1 conducting of the corresponding electrical connection of device column；The data line that sample circuit pair is connect with green device column
On voltage successively sampled；
To the gate input control signal of the first transistor T1 of the corresponding electrical connection of blue-light device column, control and blue light
The first transistor T1 conducting of the corresponding electrical connection of device column；The data line that sample circuit pair is connect with blue-light device column
On voltage successively sampled.
Optionally, when detecting the anode voltage of each organic luminescent device, can detect each sub-pixel has under different grayscale
The anode voltage of machine luminescent device.Specifically, sub-pixel is made to show that different grayscale can export different electric currents by control current source
To realize.In addition, driving current of the organic luminescent device under same gray level because of different luminescent colors is of different sizes, therefore can divide
Color detects the anode voltage of organic luminescent device, and then reduces the frequent switching of current source output electric current, increases aobvious
The reliability of showing device.Also, point color detects the anode voltage of organic luminescent device, can control the first transistor
The number of the signal wire of T1 and control the first transistor T2, is conducive to the realization of narrow frame.
Note that the above is only a better embodiment of the present invention and the applied technical principle.It will be appreciated by those skilled in the art that
The invention is not limited to the specific embodiments described herein, be able to carry out for a person skilled in the art it is various it is apparent variation,
It readjusts and substitutes without departing from protection scope of the present invention.Therefore, although being carried out by above embodiments to the present invention
It is described in further detail, but the present invention is not limited to the above embodiments only, without departing from the inventive concept, also
It may include more other equivalent embodiments, and the scope of the invention is determined by the scope of the appended claims.
Claims (15)
1. a kind of display device characterized by comprising
Multiple organic luminescent devices and the multiple pixel circuits for driving the organic luminescent device；
The drive signal line connecting with the pixel circuit, the drive signal line are data line or reference voltage line；
Detecting unit, the detecting unit are used for electric to the organic luminescent device output driving by the drive signal line
Stream, and detect the voltage on the drive signal line.
2. display device according to claim 1, which is characterized in that the detecting unit include current source, sample circuit,
Gating circuit and analog to digital conversion circuit；
The gating circuit includes multiple gating subelements, and each gating subelement includes current input terminal, electric current output
The current input terminal of end and sampled voltage output end, each gating subelement is electrically connected with the current source, and each gating is single
The electrical connection corresponding with the data line of the current output terminal of member；
The sample circuit includes multiple input terminals and multiple output ends, multiple input terminals of the sample circuit with it is the multiple
The sampled voltage output end of sample strobe subelement corresponds electrical connection, and the output end of the sample circuit and the modulus turn
Circuit electrical connection is changed, the sample circuit is used in the gating subelement conducting of corresponding electrical connection, to sub with the gating
Voltage on the data line of unit electrical connection is sampled.
3. display device according to claim 2, which is characterized in that the gating subelement include the first gating switch and
Second gating switch, first gating switch and the second gating switch include first end, second end and control terminal, and described first
Current input terminal of the first end of gating switch as the gating subelement, first gating switch and second gating are opened
The second end of pass is electrically connected to form common end, current output terminal of the common end as the gating subelement, second choosing
Open up sampled voltage output end of the first end as the gating subelement of pass.
4. display device according to claim 2, which is characterized in that the detecting unit further includes that multiple third gatings are opened
It closes, the first end of multiple third gating switches is electrically connected with the output end of multiple sample circuits one-to-one correspondence, each institute
The second end for stating third gating switch is electrically connected with analog-digital conversion circuit as described.
5. display device according to claim 2, which is characterized in that the sample circuit includes first capacitor, and described
First pole of one capacitor is electrically connected with the input terminal of the sample circuit and output end, the second pole ground connection of the first capacitor.
6. display device according to claim 2, which is characterized in that described non-display including viewing area and non-display area
Area is provided with multiple the first transistors and multiple second transistors, and the pixel circuit is set to the viewing area；The reference
The first end of pressure-wire is electrically connected to the pixel circuit, and the second end of the reference voltage line passes through a first transistor
It is electrically connected reference voltage input terminal；The pixel circuit includes third transistor, and the anode of the organic luminescent device passes through institute
It states third transistor and is electrically connected the reference voltage line；The first pole and the second pole of the second transistor are electrically connected described
The data line and reference voltage line of pixel circuit electrical connection.
7. display device according to claim 2, which is characterized in that the pixel circuit includes the 4th transistor, the 5th
Transistor, the 6th transistor, the 7th transistor, the 8th transistor, the 9th transistor and the second capacitor；Each organic luminescent device
Anode with drive the data line that is connected of pixel circuit of the organic luminescent device by the 4th transistor, the 5th transistor and
The electrical connection of 6th transistor；
The grid of 4th transistor is electrically connected with the second scan line, the first pole of the 4th transistor and a data line
Corresponding electrical connection, the second pole of the 4th transistor is electrically connected with the first pole of the 5th transistor；
The grid of 6th transistor is electrically connected with light emitting control line, the first pole of the 6th transistor and the 5th crystalline substance
Second pole of body pipe is electrically connected, and the second pole of the 6th transistor is electrically connected with the anode of the organic luminescent device；
The grid of 7th transistor is electrically connected with third scan line, the first pole of the 7th transistor and the 5th crystalline substance
The grid of body pipe is electrically connected, the electrical connection corresponding with one article of reference voltage line of the second pole of the 7th transistor；
The grid of 8th transistor is electrically connected with the light emitting control line, the first pole of the 8th transistor and the first electricity
Horizontal line electrical connection, the second pole of the 8th transistor is electrically connected with the first pole of the 5th transistor；
The grid of 9th transistor is electrically connected with second scan line, the first pole of the 9th transistor and described the
The grid of five transistors is electrically connected, and the second pole of the 9th transistor is electrically connected with the second pole of the 5th transistor；
First pole of second capacitor is electrically connected with the first level line, the second pole of second capacitor and the described 4th
The grid of transistor is electrically connected.
8. display device according to claim 2, which is characterized in that the detecting unit is integrated in driving chip, institute
Stating driving chip includes multiple data voltage output ends, and the current output terminal of each gating subelement passes through a first switch
It is electrically connected with the data voltage output end；
Each data voltage output end is electrically connected a data line or each data voltage output end passes through
Multiple selector is electrically connected at least two data lines；
The driving chip further includes display driver element, and the display driver element includes multiple output ends, each drive
The output end of moving cell is electrically connected by a second switch with the data voltage output end.
9. display device according to claim 8, which is characterized in that it further include data processing unit, the data processing
Unit is electrically connected with the detecting unit and the display driver element respectively；
Under the sense mode, the first switch conducting, the second switch shutdown, the data processing unit is for detecing
Under survey mode, the organic luminescent device anode voltage twice detected under same driving current according to the detecting unit
Difference determines compensated data voltage；Under the display pattern, the second switch conducting, the first switch shutdown, institute
Driving chip is stated for exporting compensated data voltage to the data line.
10. a kind of driving method of display device, which is characterized in that the display device include: multiple organic luminescent devices and
Drive multiple pixel circuits of the organic luminescent device；The drive signal line being connect with the pixel circuit, the driving letter
Number line is data line or reference voltage line；Detecting unit；
The driving method includes:
In sense mode, the detecting unit by the drive signal line to the organic luminescent device output driving current,
And detect the voltage on the drive signal line.
11. driving method according to claim 10, which is characterized in that the detecting unit includes current source, sampling electricity
Road, gating circuit and analog to digital conversion circuit；
The gating circuit includes multiple gating subelements, and each gating subelement includes current input terminal, electric current output
End and sampled voltage output end, the current input terminal of each sample strobe unit are electrically connected with the current source, each sampling choosing
The electrical connection corresponding with the data line of the current output terminal of logical unit；
The sample circuit includes multiple input terminals and multiple output ends, multiple input terminals of the sample circuit with it is the multiple
The sampled voltage output end of sample strobe subelement corresponds electrical connection, and the output end of the sample circuit and the modulus turn
Change circuit electrical connection；
The driving method includes:
In sense mode, controls multiple gating subelements and sequentially turn on, the sample circuit is to the electricity on the data line
Pressure is successively sampled, during one of them described gating subelement conducting, other gating subelement shutdowns.
12. driving method according to claim 11, which is characterized in that the display device includes viewing area and non-display
Area, the viewing area are provided with multiple the first transistors and multiple second transistors, and the pixel circuit is set to the display
Area；One end of the reference voltage line is electrically connected to the pixel circuit, and the second end of the reference voltage signal line passes through one
The first transistor is electrically connected reference voltage input terminal；The pixel circuit includes third transistor, the organic illuminator
The anode of part is electrically connected the reference voltage line by the third transistor；The first pole and the second pole of the second transistor
It is electrically connected the data line and reference voltage line of the pixel circuit electrical connection, it is described in sense mode, it controls multiple described
Gating subelement sequentially turns on, comprising:
In the sense mode, second transistor and third transistor conducting, the first transistor shutdown are controlled；
When second transistor and third transistor are connected, the gating subelement for controlling electrical connection corresponding with the second transistor is led
It is logical.
13. driving method according to claim 12, which is characterized in that the organic luminescent device include red device,
Green device and blue-light device；
It is described in sense mode, control multiple gating subelements and sequentially turn on, the sample circuit is on the data line
Voltage successively sampled, during one of them described gating subelement conducting, other gating subelements shutdowns, comprising:
To the gate input control signal of the first transistor of electrical connection corresponding with red device column, control and red device
The first transistor conducting of the corresponding electrical connection of column；On the data line that the sample circuit pair is connect with red device column
Voltage successively sampled；
To the gate input control signal of the first transistor of the corresponding electrical connection of green device column, control and green device institute
In the first transistor conducting of the corresponding electrical connection of column；On the data line that the sample circuit pair is connect with green device column
Voltage is successively sampled；
To the gate input control signal of the first transistor of the corresponding electrical connection of blue-light device column, control and blue-light device institute
In the first transistor conducting of the corresponding electrical connection of column；On the data line that the sample circuit pair is connect with blue-light device column
Voltage is successively sampled.
14. driving method according to claim 11, which is characterized in that
The detecting unit is integrated in driving chip, and the driving chip includes multiple data voltage output ends, each described
The current output terminal of gating subelement is electrically connected by a first switch with the data voltage output end；
Each data voltage output end is electrically connected a data line or each data voltage output end passes through
Multiple selector is electrically connected at least two data lines；
The driving chip further includes display driver element, and the display driver element includes multiple output ends, each drive
The output end of moving cell is electrically connected by a second switch with the data voltage output end；
The display device further includes data processing unit, the data processing unit respectively with the detecting unit and described aobvious
Show that driving unit is electrically connected；
The driving method includes:
Sense mode, the first switch conducting, the second switch shutdown, the detecting unit detecting organic luminescent device
Anode voltage, and the anode voltage of the organic luminescent device detected is transmitted to data processing unit；The data processing list
Member determines compensated data electricity according to the voltage for the data voltage output end twice detected under same driving current
Pressure；
The compensated data voltage is calculated using following formula:
Wherein, VDATA' it is compensated data voltage；ELVDD is the voltage that drive transistor source pole is inputted in pixel circuit；KS
For transistor in pixel circuit output characteristic curve saturation region slope；ΔVSxTo be detected twice under same driving current
The organic luminescent device anode voltage difference；K is constant；VDATAFor the data voltage before compensation；
Display pattern, first switch shutdown, the second switch conducting, the display driver element is by compensated data
Voltage transmission is to the data line.
15. the described in any item driving methods of 1-14 according to claim 1, which is characterized in that
The detecting unit detects the voltage on the drive signal line respectively before factory and after factory.
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| WO2023284009A1 (en) * | 2021-07-15 | 2023-01-19 | Tcl华星光电技术有限公司 | Display back plate and mobile terminal |
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