CN109559686A - Pixel circuit, driving method, electroluminescence display panel and display device - Google Patents
Pixel circuit, driving method, electroluminescence display panel and display device Download PDFInfo
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- CN109559686A CN109559686A CN201910105995.0A CN201910105995A CN109559686A CN 109559686 A CN109559686 A CN 109559686A CN 201910105995 A CN201910105995 A CN 201910105995A CN 109559686 A CN109559686 A CN 109559686A
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- 238000005401 electroluminescence Methods 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims abstract description 17
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- 208000033361 autosomal recessive with axonal neuropathy 2 spinocerebellar ataxia Diseases 0.000 description 3
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- 230000004048 modification Effects 0.000 description 3
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- 230000032683 aging Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000002096 quantum dot Substances 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
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- 239000012535 impurity Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000005424 photoluminescence Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
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Classifications
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3266—Details of drivers for scan electrodes
-
- 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
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Electroluminescent Light Sources (AREA)
Abstract
The invention discloses a kind of pixel circuit, driving method, electroluminescence display panel and display devices, in initial phase, by initialization module in response to the first scanning signal, initializing signal is supplied to the first pole of driving transistor, by compensating module in response to third scanning signal, the grid of transistor will be driven to be connected with the first pole.Data-signal is supplied to the second pole of driving transistor by compensating module in response to the second scanning signal in data write phase, and in response to third scanning signal, the grid of transistor will be driven to be connected with the first pole.In light emitting phase, by light emitting control module in response to LED control signal, the first power end is connected with the first pole of driving transistor, the second pole of transistor will be driven to be connected with the first pole of luminescent device, to drive luminescent device to shine.The compensation of the threshold voltage to driving transistor can be realized by simple structure and simple timing.
Description
Technical field
The present invention relates to field of display technology, in particular to a kind of pixel circuit, driving method, electroluminescence display panel
And display device.
Background technique
Organic Light Emitting Diode (Organic Light Emitting Diode, OLED) display has low energy consumption, life
The advantages that producing at low cost, self-luminous, wide viewing angle and fast response time is one of the hot spot of current flat-panel monitor research field.
Wherein, the design that luminous pixel circuit is carried out for controlling OLED is the core technology content of OLED display.Due to OLED
Belong to electric current driving, needs stable electric current to control it and shine.However, due to manufacturing process and device aging etc., meeting
Make the threshold voltage V of driving transistor for driving OLED to shine in pixel circuitthThere are inhomogeneities, cause to flow through OLED in this way
Electric current can change so that display brightness is uneven, to influence the display effect of whole image.
Summary of the invention
The embodiment of the present invention provides a kind of pixel circuit, driving method, electroluminescence display panel and display device, to
Make the operating current for driving luminescent device luminous keep stablizing, improves the uniformity of image display brightness.
The embodiment of the invention provides a kind of pixel circuits, comprising: driving transistor, initialization module, compensating module, hair
Photocontrol module and luminescent device；
The initialization module is configured to respond to the first scanning signal, and it is brilliant that initializing signal is supplied to the driving
First pole of body pipe；
The compensating module is configured to respond to the second scanning signal, and data-signal is supplied to the driving transistor
The second pole；And in response to third scanning signal, the grid of the driving transistor is connected with the first pole；
The light emitting control module is configured to respond to LED control signal, by the first power end and the driving crystal
First pole of pipe is connected, and the second pole of the driving transistor is connected with the first pole of the luminescent device, drives institute
Luminescent device is stated to shine.
Optionally, in embodiments of the present invention, the initialization module includes: the first transistor；
The grid of the first transistor is configured as receiving first scanning signal, and the first of the first transistor
Pole is configured as receiving the initializing signal, the first pole coupling of the second pole of the first transistor and the driving transistor
It connects.
Optionally, in embodiments of the present invention, the compensating module includes: second transistor, third transistor and deposits
Storage is held；
The grid of the second transistor is configured as receiving second scanning signal, and the first of the second transistor
Pole is configured as receiving the data-signal, the second pole coupling of the second pole of the second transistor and the driving transistor
It connects；
The grid of the third transistor is configured as receiving the third scanning signal, and the first of the third transistor
The grid of pole and the driving transistor couples, the first pole coupling of the second pole of the third transistor and the driving transistor
It connects；
The first end of the storage capacitance and it is described driving transistor grid couple, the second end of the storage capacitance with
Second source end or the coupling of the first power end.
Optionally, in embodiments of the present invention, the light emitting control module includes: the 4th transistor and the 5th transistor；
The grid of 4th transistor is configured as receiving the LED control signal, and the first of the 4th transistor
Pole and first power end couple, and the first pole of the second pole of the 4th transistor and the driving transistor couples；
The grid of 5th transistor is configured as receiving the LED control signal, and the first of the 5th transistor
Pole and the second pole of the driving transistor couple, the second pole of the 5th transistor and the first pole coupling of the luminescent device
It connects.
Optionally, in embodiments of the present invention, the pixel circuit further include: the 6th transistor；
The grid of 6th transistor is configured as receiving first scanning signal, and the first of the 6th transistor
Pole is configured as receiving reset signal, and the second pole of the 6th transistor and the first pole of the luminescent device couple.
Optionally, in embodiments of the present invention, the reset signal and the initializing signal are same signal.
Optionally, in embodiments of the present invention, the voltage of the reset signal is less than the voltage at second source end.
Correspondingly, the embodiment of the invention also provides a kind of electroluminescence display panels, including above-mentioned pixel circuit.
Correspondingly, the embodiment of the invention also provides a kind of display devices, including above-mentioned electroluminescence display panel.
Correspondingly, the embodiment of the invention also provides a kind of driving methods of above-mentioned pixel circuit, comprising:
Initial phase, the initialization module are supplied to the drive in response to the first scanning signal, by initializing signal
First pole of dynamic transistor；The compensating module is in response to third scanning signal, by the grid and first of the driving transistor
Pole conducting；
Data write phase, the compensating module are supplied to the driving in response to the second scanning signal, by data-signal
Second pole of transistor；And in response to third scanning signal, the grid of the driving transistor is connected with the first pole；
Light emitting phase, the light emitting control module are brilliant by the first power end and the driving in response to LED control signal
First pole of body pipe is connected, and the second pole of the driving transistor is connected with the first pole of the luminescent device, drives
The luminescent device shines.
The present invention has the beneficial effect that:
Pixel circuit, driving method, electroluminescence display panel and display device provided in an embodiment of the present invention, initial
Initializing signal is supplied to the first pole of driving transistor by initialization module in response to the first scanning signal by the change stage,
And the grid of transistor will be driven to be connected with the first pole, so as to right in response to third scanning signal by compensating module
The grid and the first pole for driving transistor are initialized.In data write phase, by compensating module in response to the second scanning
Data-signal, is supplied to the second pole of driving transistor by signal, and in response to third scanning signal, will drive transistor
Grid is connected with the first pole, so as to by the voltage of data-signal and drive transistor threshold voltage write driver crystal
The grid of pipe.In light emitting phase, by light emitting control module in response to LED control signal, by the first power end and driving crystal
First pole of pipe is connected, and the second pole of transistor will be driven to be connected with the first pole of luminescent device, to drive luminescent device
It shines.It therefore, can be by the mutual cooperation of above-mentioned each module, to be realized by simple structure and simple timing to driving
The compensation of the threshold voltage of transistor, so as to simplifying preparation process, reducing production cost and reducing area occupied, favorably
In the design of high-resolution display panel.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of pixel circuit provided in an embodiment of the present invention；
Fig. 2 is one of the concrete structure schematic diagram of pixel circuit provided in an embodiment of the present invention；
Fig. 3 is signal timing diagram provided in an embodiment of the present invention；
Fig. 4 is the two of the concrete structure schematic diagram of pixel circuit provided in an embodiment of the present invention；
Fig. 5 is the three of the concrete structure schematic diagram of pixel circuit provided in an embodiment of the present invention；
Fig. 6 is the flow chart of driving method provided in an embodiment of the present invention；
Fig. 7 is the structural schematic diagram of display device provided in an embodiment of the present invention.
Specific embodiment
In order to make the purpose of the present invention, the technical scheme and advantages are more clear, with reference to the accompanying drawing, to the embodiment of the present invention
The pixel circuit of offer, driving method, electroluminescence display panel and display device specific embodiment carry out in detail
It is bright.It should be appreciated that preferred embodiment disclosed below is only for the purpose of illustrating and explaining the present invention and is not intended to limit the present invention.
And in the absence of conflict, the features in the embodiments and the embodiments of the present application can be combined with each other.It should be noted that
It is that the size and shape of each figure do not reflect actual proportions in attached drawing, purpose is schematically illustrate the content of present invention.And from beginning
Same or similar element or element with the same or similar functions are indicated to same or similar label eventually.
The embodiment of the invention provides a kind of pixel circuits, as shown in Figure 1, comprising: driving transistor M0, initialization module
10, compensating module 20, light emitting control module 30 and luminescent device L；
Initialization module 10 is configured to respond to the first scanning signal SCAN1, and initializing signal VINIT is supplied to drive
The first pole S of dynamic transistor M0；
Compensating module 20 is configured to respond to the second scanning signal SCAN2, and it is brilliant that data-signal DATA is supplied to driving
The second pole D of body pipe M0；And in response to third scanning signal SCAN3, the grid G of transistor M0 will be driven to lead with the first pole S
It is logical；
Light emitting control module 30 is configured to respond to LED control signal EM, by the first power end VDD and driving crystal
The first pole S of pipe M0 is connected, and the second pole D of transistor M0 will be driven to be connected with the first pole of luminescent device L, and driving shines
Device L shines.
Pixel circuit provided in an embodiment of the present invention, in initial phase, by initialization module in response to the first scanning
Initializing signal is supplied to the first pole of driving transistor by signal, and by compensating module in response to third scanning signal,
The grid of transistor will be driven to be connected with the first pole, so as to initialize to the grid and the first pole that drive transistor.
In data write phase, by compensating module in response to the second scanning signal, data-signal is supplied to the of driving transistor
Two poles, and in response to third scanning signal, the grid of transistor will be driven to be connected with the first pole, so as to by data-signal
Voltage and drive transistor threshold voltage write driver transistor grid.In light emitting phase, pass through light emitting control mould
Block is connected in response to LED control signal, by the first power end with the first pole of driving transistor, and will drive transistor
Second pole is connected with the first pole of luminescent device, to drive luminescent device to shine.Therefore, the mutual of above-mentioned each module can be passed through
Cooperation, to realize the compensation of the threshold voltage to driving transistor by simple structure and simple timing, so as to letter
Change preparation process, reduce production cost and reduce area occupied, is conducive to the design of high-resolution display panel.
Combined with specific embodiments below, the present invention is described in detail.It should be noted that be in the present embodiment in order to
It preferably explains the present invention, but does not limit the present invention.
Embodiment one,
In the specific implementation, in embodiments of the present invention, as shown in Figure 1, driving transistor M0 can be P-type transistor；
Wherein, the first pole S of transistor M0 is driven to can be used as its source electrode, the second pole D of driving transistor M0 can be used as its drain electrode.
And electric current when driving transistor M0 is in a saturated state flows to its drain electrode by the source electrode of driving transistor M0.Certainly, exist
In the embodiment of the present invention, be only by drive transistor be P-type transistor for be illustrated, for driving transistor be N-type
The case where transistor, design principle is identical as the present invention, also belongs to the scope of protection of the invention.
In the specific implementation, in embodiments of the present invention, as shown in Figure 1, the second pole of luminescent device L and second source end
VSS coupling.Further, the voltage V of the signal of the first power end VDDddGenerally positive value, the voltage of initializing signal VINIT
VinitGenerally negative value, the voltage V of the signal of second source end VSSssGenerally ground voltage or be negative value.In practical application
In, above-mentioned each voltage needs to design determination according to actual application environment, is not limited thereto.
Luminescent device generally drive transistor it is in a saturated state when electric current under the action of realize shine.Also, one
As luminescent device have cut-in voltage, luminescent device both ends voltage be greater than or equal to cut-in voltage when carry out it is luminous.Having
When body is implemented, in embodiments of the present invention, luminescent device may include: electroluminescent diode；Wherein, electroluminescent diode
First pole of the anode as luminescent device, second pole of the cathode of electroluminescent diode as luminescent device.Specifically, electric
Photoluminescence diode may include: OLED or light emitting diode with quantum dots (Quantum Dot Light Emitting
Diodes, QLED).
In the specific implementation, in embodiments of the present invention, as shown in Fig. 2, initialization module 10 may include: first crystal
Pipe M1；Wherein, the grid of the first transistor M1 be configured as receive the first scanning signal SCAN1, the first of the first transistor M1
Pole is configured as receiving initializing signal VINIT, the second pole of the first transistor M1 and the first pole S coupling of driving transistor M0
It connects.
In the specific implementation, in embodiments of the present invention, the first transistor M1 is under the control of the first scanning signal SCAN1
When in the conductive state, initializing signal VINIT can be supplied to the first pole of driving transistor M0.
In the specific implementation, in embodiments of the present invention, as shown in Fig. 2, compensating module 20 may include: second transistor
M2, third transistor M3 and storage capacitance CST；
The grid of second transistor M2 is configured as receiving the second scanning signal SCAN2, the first pole of second transistor M2
It is configured as receiving data-signal DATA, the second pole of second transistor M2 and the second pole D of driving transistor M0 are coupled；
The grid of third transistor M3 is configured as receiving third scanning signal SCAN3, the first pole of third transistor M3
It is coupled with the grid G of driving transistor M0, the second pole of third transistor M3 and the first pole S of driving transistor M0 are coupled；
The first end of storage capacitance CST and the grid G of driving transistor M0 couple, the second end of storage capacitance CST and the
Two power end VSS coupling.Alternatively, the second end of storage capacitance CST and the first power end VDD are coupled.
In the specific implementation, in embodiments of the present invention, second transistor M2 is under the control of the second scanning signal SCAN2
When in the conductive state, data-signal DATA can be supplied to the second pole D of driving transistor M0.Third transistor M3 is
When in the conductive state under the control of three scanning signal SCAN3, the grid G of transistor M0 can will be driven to be connected with the first pole S,
So that driving transistor M0 is in diode-connected state.Storage capacitance CST can store the grid G of input driving transistor M0
Voltage.
In the specific implementation, in embodiments of the present invention, as shown in Fig. 2, light emitting control module may include: the 4th crystal
Pipe M4 and the 5th transistor M5；
The grid of 4th transistor M4 is configured as receiving LED control signal EM, the first pole of the 4th transistor M4 and the
One power end VDD coupling, the second pole of the 4th transistor M4 and the first pole S of driving transistor M0 are coupled；
The grid of 5th transistor M5 is configured as receiving LED control signal EM, the first pole of the 5th transistor M5 and drive
The second pole D coupling of dynamic transistor M0, the second pole of the 5th transistor M5 and the first pole of luminescent device L couple.
In the specific implementation, in embodiments of the present invention, the 4th transistor M4 is under the control of LED control signal EM
When on state, the first power end VDD can be connected with the first pole S of driving transistor M0, by the first power end VDD
Signal be supplied to driving transistor M0 the first pole S.5th transistor M5 is under the control of LED control signal EM and leads
When logical state, the second pole D of transistor M0 can will be driven to be connected with the first pole of luminescent device L, transistor M0 will be driven
The electric current of generation is supplied to luminescent device L, and driving luminescent device L shines.
The above is only the specific structures of each module in the pixel circuit for illustrating the present invention embodiment offer, specific real
The specific structure of Shi Shi, above-mentioned each module are not limited to above structure provided in an embodiment of the present invention, can also be art technology
Other structures known to personnel, are not limited thereto.
Further, in order to simplify preparation process, in the specific implementation, in embodiments of the present invention, as shown in Fig. 2, working as
When driving transistor is P-type transistor, the first to the 5th transistor is P-type transistor.Certainly, when driving transistor is N-type
When transistor, the first to the 5th transistor is N-type transistor.
Further, in the specific implementation, P-type transistor ends under high level effect, is connected under low level effect；
N-type transistor is connected under high level effect, ends under low level effect.
It should be noted that in embodiments of the present invention, above-mentioned transistor can be thin film transistor (TFT) (TFT, Thin
Film Transistor), it is also possible to metal oxide semiconductor field effect tube (MOS, Metal Oxide
Scmiconductor), it is not limited thereto.In specific implementation, the first pole of above-mentioned transistor can be used as its source electrode, the
Two poles can be used as its drain electrode；Alternatively, the first pole is as its drain electrode, the second pole is not distinguished specifically herein as its source electrode.
Below by taking pixel circuit shown in Fig. 2 as an example, signal timing diagram as shown in connection with fig. 3 provides the embodiment of the present invention
The course of work of above-mentioned pixel circuit be described.High level is indicated with 1 in described below, and 0 indicates low level, needs to illustrate
, 1 and 0 is logic level, merely to preferably explaining the specific work process of the embodiment of the present invention, rather than is being had
Body is applied to the voltage on the grid of each transistor when implementing.
One frame time may include: initial phase T1, data write phase T2 and light emitting phase T3.
In initial phase T1, SCNA1=0, SCNA2=1, SCNA3=0, EM=1.
Since SCNA2=1, second transistor M2 end.Due to EM=1, the 4th transistor M4 and the 5th is brilliant
Body pipe M5 is turned off.Since SCNA1=0, the first transistor M1 are connected, and due to SCNA3=0, third crystal
Pipe M3 conducting.Therefore, initializing signal VINIT can be supplied to the first pole S and grid G of driving transistor M0, thus right
The grid G and the first pole S for driving transistor M0 are initialized.
In data write phase T2, SCNA1=1, SCNA2=0, SCNA3=0, EM=1.
Since SCNA1=1, the first transistor M1 end.Due to EM=1, the 4th transistor M4 and the 5th is brilliant
Body pipe M5 is turned off.Due to SCNA3=0, third transistor M3 be connected, will drive transistor M0 grid G and its first
Pole S conducting, to form diode connection type.Since SCNA2=0, second transistor M2 are connected, by data-signal
DATA is supplied to the second pole D of driving transistor M0.The voltage V of data-signal DATADATAIt is brilliant by the driving of diode
Body pipe M0 charges to its grid G, until the voltage of the grid G of driving transistor M0 becomes: VDATA+VthWhen end.Then, it deposits
The voltage difference that storage holds the both ends CST is VDATA+Vth-Vss。
In light emitting phase T3, SCNA1=1, SCNA2=1, SCNA3=1, EM=0.
Since SCNA1=1, the first transistor M1 end.Since SCNA2=1, second transistor M2 end.
Since SCNA3=1, third transistor M3 end.Due to EM=0, the 4th transistor M4 and the 5th transistor M5 are equal
Conducting.The signal of first power end VDD is supplied to the first pole S of driving transistor M0 by the 4th transistor M4 of conducting, makes to drive
The voltage of the first pole S of dynamic transistor M0 is Vdd.Due to the effect of storage capacitance CST, the grid G of transistor M0 is driven
Voltage are as follows: VDATA+Vth.According to saturation state current characteristics it is found that flowing through driving transistor M0 and for driving luminescent device L to send out
The electric current I of lightLMeet formula: IL=β (VGS-Vth)2=β (VDATA-Vdd)2；Wherein,μnTo drive crystal
The electron mobility of pipe M0, CoxFor the gate oxide capacitance of unit area,For the breadth length ratio for driving transistor M0, VGSTo drive
Voltage difference between the grid G and the first pole S of dynamic transistor M0.Therefore, driving transistor M0 driving luminescent device L luminous electricity
Flow ILOnly with the voltage V of data-signal DATADATAAnd first power end VDD voltage VddIt is related, and with driving transistor M0
Threshold voltage VthIt is unrelated, it can solve the threshold value as caused by the manufacturing process of driving transistor M0 and prolonged operation
Voltage VthThe influence drifted about to the electric current of driving luminescent device L, so that the electric current for driving luminescent device L luminous is made to keep stablizing,
And then it ensure that the normal work of luminescent device L.
Also, the grid of the driving transistor M0 in existing pixel circuit in addition to for compensating threshold voltage VthCrystalline substance
The coupling of body pipe, also couples with reset circuit, so as to cause the crystalline substance that in light emitting phase, the grid of driving transistor M0 passes through coupling
Body pipe generates larger electric leakage, leads to the grid voltage decaying for driving transistor M0, and then lead to brightness decay during display.And
Pixel circuit in the present embodiment is only useful for compensation threshold voltage V with the transistor of the grid G coupling of driving transistor M0th
Third transistor M3, therefore drive the grid G of transistor M0 by transistor coupled thereto during can reduce display
Electric leakage reduces brightness decay caused by the grid G voltage attenuation during showing because driving transistor M0, improves brightness stability
Property.
Embodiment two,
The concrete structure schematic diagram of the corresponding pixel circuit of the present embodiment is as shown in Figure 4 and Figure 5, in embodiment one
Embodiment deformed.In place of the difference for only illustrating the present embodiment and embodiment one below, something in common is herein not
It repeats.
In the specific implementation, in embodiments of the present invention, as shown in figs. 4 and 5, pixel circuit can also include: the 6th
Transistor M6.Wherein, as shown in figure 4, the grid of the 6th transistor M6 be configured as receive the first scanning signal SCAN1, the 6th
The first pole of transistor M6 is configured as receiving reset signal VRE, the second pole of the 6th transistor M6 and the first of luminescent device L
Pole coupling.
In the specific implementation, in embodiments of the present invention, the 6th transistor M6 is under the control of the first scanning signal SCAN1
When in the conductive state, reset signal VRE can be supplied to the first pole of luminescent device L, with the first pole to luminescent device L
It is resetted.
Generally, luminescent device (such as OLED) is when the effect of forward dc driving voltage issues light, due to miscellaneous in luminescent layer
The displacement of matter ion causes to form an internal electric field in luminescent layer, to reduce effective electricity for carrier injection
, lead to the increase of the cut-in voltage of luminescent device, cause the degeneration of luminescent device, reduces the working life of luminescent device.For
The improvement above problem, in the specific implementation, in embodiments of the present invention, the voltage of reset signal VRE is less than second source end
The voltage of VSS.Luminescent device can be made to be in reverse bias condition in this way, can be offset during showing due to impurity in luminescent layer
The internal electric field that the displacement of ion is formed slows down the old of luminescent device so as to restore the normal characteristic of luminescent device
Change phenomenon.
Further, in order to reduce the setting of signal wire, wiring space is saved, in the specific implementation, is implemented in the present invention
In example, reset signal and initializing signal can be made to be set as same signal.As shown in figure 5, can make the 6th transistor M6's
First extremely directly receives initializing signal VINIT.That is voltage of the voltage of initializing signal VINIT less than second source end VSS.
Below by taking pixel circuit shown in fig. 5 as an example, signal timing diagram as shown in connection with fig. 3 provides the embodiment of the present invention
The course of work of above-mentioned pixel circuit be described.High level is indicated with 1 in described below, and 0 indicates low level, needs to illustrate
, 1 and 0 is logic level, merely to preferably explaining the specific work process of the embodiment of the present invention, rather than is being had
Body is applied to the voltage on the grid of each transistor when implementing.
One frame time may include: initial phase T1, data write phase T2 and light emitting phase T3.
In initial phase T1, due to SCNA1=0, the 6th transistor M6 is also switched on, by initializing signal
VINIT is supplied to the first pole of luminescent device L so that luminescent device L is in reverse bias condition, can offset during display by
Subtract in the internal electric field that the displacement of foreign ion in luminescent layer is formed so as to restore the normal characteristic of luminescent device
The aging phenomenon of deferred optical device.Remaining course of work is basically the same as the first embodiment, and therefore not to repeat here.
In data write phase T2, since SCNA1=1, the 6th transistor M6 end.Remaining course of work and implementation
Example one is essentially identical, and therefore not to repeat here.
In light emitting phase T3, since SCNA1=1, the 6th transistor M6 end.Remaining course of work and embodiment one
Essentially identical, therefore not to repeat here.
Based on the same inventive concept, the embodiment of the invention also provides a kind of driving method of above-mentioned pixel circuit, such as Fig. 6
Shown, a frame time may include: initial phase, data write phase and light emitting phase.It specifically, may include as follows
Step:
S601, initial phase, initialization module are supplied to driving crystalline substance in response to the first scanning signal, by initializing signal
First pole of body pipe；Compensating module will drive the grid of transistor to be connected with the first pole in response to third scanning signal；
S602, data write phase, compensating module are supplied to driving crystal in response to the second scanning signal, by data-signal
Second pole of pipe；And in response to third scanning signal, the grid of transistor will be driven to be connected with the first pole；
S603, light emitting phase, light emitting control module is in response to LED control signal, by the first power end and driving transistor
The conducting of the first pole, and the second pole of transistor will be driven be connected with the first pole of luminescent device, driving luminescent device is luminous.
In the specific implementation, in embodiments of the present invention, in initial phase, the 6th transistor is believed in response to the first scanning
Number, reset signal is mentioned to the first pole of luminescent device.
Wherein, the driving principle and specific embodiment of the driving method of the pixel circuit and above-mentioned pixel circuit embodiment
Principle it is identical with embodiment, therefore, the driving method of the pixel circuit can be found in the tool of pixel circuit in above-described embodiment
Body embodiment is implemented, and details are not described herein.
Based on the same inventive concept, the embodiment of the invention also provides a kind of electroluminescence display panels, including the present invention
Any of the above-described kind of pixel circuit that embodiment provides.The principle and aforementioned pixel circuit that the electroluminescence display panel solves the problems, such as
It is similar, therefore the implementation of the electroluminescence display panel may refer to the implementation of aforementioned pixel circuit, repeat place herein no longer
It repeats.
Based on the same inventive concept, the embodiment of the invention also provides a kind of display devices, including the embodiment of the present invention to mention
The above-mentioned electroluminescence display panel supplied.The principle that the display device solves the problems, such as is similar to aforementioned electroluminescence display panel,
Therefore the implementation of the display device may refer to the implementation of aforementioned electroluminescence display panel, and repeating place, details are not described herein.
In the specific implementation, as shown in fig. 7, display device provided in an embodiment of the present invention can be with are as follows: mobile phone.Certainly, it shows
Showing device can also have display for tablet computer, television set, display, laptop, Digital Frame, navigator etc. are any
The products or components of function.Other essential component parts for the display device are the ordinary skill people of this field
For member it should be understood that having, this will not be repeated here, also should not be taken as limiting the invention.
Pixel circuit, driving method, electroluminescence display panel and display device provided in an embodiment of the present invention, initial
Initializing signal is supplied to the first pole of driving transistor by initialization module in response to the first scanning signal by the change stage,
And the grid of transistor will be driven to be connected with the first pole, so as to right in response to third scanning signal by compensating module
The grid and the first pole for driving transistor are initialized.In data write phase, by compensating module in response to the second scanning
Data-signal, is supplied to the second pole of driving transistor by signal, and in response to third scanning signal, will drive transistor
Grid is connected with the first pole, so as to by the voltage of data-signal and drive transistor threshold voltage write driver crystal
The grid of pipe.In light emitting phase, by light emitting control module in response to LED control signal, by the first power end and driving crystal
First pole of pipe is connected, and the second pole of transistor will be driven to be connected with the first pole of luminescent device, to drive luminescent device
It shines.It therefore, can be by the mutual cooperation of above-mentioned each module, to be realized by simple structure and simple timing to driving
The compensation of the threshold voltage of transistor, so as to simplifying preparation process, reducing production cost and reducing area occupied, favorably
In the design of high-resolution display panel.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (10)
1. a kind of pixel circuit characterized by comprising driving transistor, initialization module, compensating module, light emitting control mould
Block and luminescent device；
The initialization module is configured to respond to the first scanning signal, and initializing signal is supplied to the driving transistor
The first pole；
The compensating module is configured to respond to the second scanning signal, and data-signal is supplied to the of the driving transistor
Two poles；And in response to third scanning signal, the grid of the driving transistor is connected with the first pole；
The light emitting control module is configured to respond to LED control signal, by the first power end and the driving transistor
The conducting of first pole, and the second pole of the driving transistor is connected with the first pole of the luminescent device, drive the hair
Optical device shines.
2. pixel circuit as described in claim 1, which is characterized in that the initialization module includes: the first transistor；
The grid of the first transistor is configured as receiving first scanning signal, the first pole quilt of the first transistor
It is configured to receive the initializing signal, the first pole coupling of the second pole of the first transistor and the driving transistor.
3. pixel circuit as described in claim 1, which is characterized in that the compensating module includes: second transistor, third crystalline substance
Body pipe and storage capacitance；
The grid of the second transistor is configured as receiving second scanning signal, the first pole quilt of the second transistor
It is configured to receive the data-signal, the second pole coupling of the second pole of the second transistor and the driving transistor；
The grid of the third transistor is configured as receiving the third scanning signal, the first pole of the third transistor with
First pole of the grid coupling of the driving transistor, the second pole of the third transistor and the driving transistor couples；
The grid of the first end of the storage capacitance and the driving transistor couples, the second end of the storage capacitance and second
Power end or the coupling of the first power end.
4. pixel circuit as described in claim 1, which is characterized in that the light emitting control module include: the 4th transistor with
5th transistor；
The grid of 4th transistor is configured as receiving the LED control signal, the first pole of the 4th transistor with
First pole of the first power end coupling, the second pole of the 4th transistor and the driving transistor couples；
The grid of 5th transistor is configured as receiving the LED control signal, the first pole of the 5th transistor with
The second pole coupling of the driving transistor, the second pole of the 5th transistor and the first pole of the luminescent device couple.
5. pixel circuit according to any one of claims 1-4, which is characterized in that the pixel circuit further include: the 6th is brilliant
Body pipe；
The grid of 6th transistor is configured as receiving first scanning signal, the first pole quilt of the 6th transistor
It is configured to receive reset signal, the second pole of the 6th transistor and the first pole of the luminescent device couple.
6. pixel circuit as claimed in claim 5, which is characterized in that the reset signal is same with the initializing signal
Signal.
7. pixel circuit as claimed in claim 5, which is characterized in that the voltage of the reset signal is less than second source end
Voltage.
8. a kind of electroluminescence display panel, which is characterized in that including such as described in any item pixel circuits of claim 1-7.
9. a kind of display device, which is characterized in that including electroluminescence display panel as claimed in claim 8.
10. a kind of driving method of such as described in any item pixel circuits of claim 1-7 characterized by comprising
Initial phase, the initialization module are supplied to the driving crystalline substance in response to the first scanning signal, by initializing signal
First pole of body pipe；The compensating module leads the grid of the driving transistor with the first pole in response to third scanning signal
It is logical；
Data write phase, the compensating module are supplied to the driving crystal in response to the second scanning signal, by data-signal
Second pole of pipe；And in response to third scanning signal, the grid of the driving transistor is connected with the first pole；
Light emitting phase, the light emitting control module is in response to LED control signal, by the first power end and the driving transistor
The first pole conducting, and by it is described driving transistor the second pole be connected with the first pole of the luminescent device, described in driving
Luminescent device shines.
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| CN202410027046.6A CN117765880A (en) | 2019-01-18 | 2019-01-18 | Pixel circuit, driving method, electroluminescent display panel and display device |
| CN201910105995.0A CN109559686B (en) | 2019-01-18 | 2019-01-18 | Pixel circuit, driving method, electroluminescent display panel and display device |
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| CN117765880A (en) | 2024-03-26 |
| CN109559686B (en) | 2024-06-11 |
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