CN110473494A - A kind of driving method of pixel circuit, display panel and pixel circuit - Google Patents
A kind of driving method of pixel circuit, display panel and pixel circuit Download PDFInfo
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- CN110473494A CN110473494A CN201910818934.9A CN201910818934A CN110473494A CN 110473494 A CN110473494 A CN 110473494A CN 201910818934 A CN201910818934 A CN 201910818934A CN 110473494 A CN110473494 A CN 110473494A
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- driving transistor
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- pixel circuit
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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]
-
- 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]
Abstract
The embodiment of the invention discloses the driving methods of a kind of pixel circuit, display panel and pixel circuit.The pixel circuit includes the first driving transistor and the second driving transistor；Second pole of first switch transistor is electrically connected with the grid of the grid of the first driving transistor and the second driving transistor；First drives the first of the first pole of transistor and the second driving transistor to be extremely electrically connected with the first power input, and first drives the second of the second pole of transistor and the second driving transistor to be extremely connected to the light emitting element；Wherein, the threshold voltage of the first driving transistor is greater than the threshold voltage of the second driving transistor, and the carrier mobility of the second driving transistor is lower than the carrier mobility of the first driving transistor.Compared with prior art, the embodiment of the present invention improves image hierarchy sense of the display panel in low ash rank, extends the brightness range of light-emitting component, improves the display image quality of display panel.
Description
Technical field
The present embodiments relate to the drives of display technology more particularly to a kind of pixel circuit, display panel and pixel circuit
Dynamic method.
Background technique
With the continuous development of display technology, display panel will be used wider and wider general, and people are to display panel
It is required that also higher and higher.The especially display image quality of display panel is consumer and panel production firm always to display panel
One of the important indicator of Quality Weighting.However, there is image hierarchy sense difference, shadow when low ash rank in existing display panel
The promotion of display panel display image quality is rung.
Summary of the invention
The present invention provides the driving method of a kind of pixel circuit, display panel and pixel circuit, is existed with promoting display panel
Image hierarchy sense when low ash rank, promotes the display image quality of display panel.
In a first aspect, the embodiment of the invention provides a kind of pixel circuit, including first switch transistor, the first driving crystalline substance
Body pipe, the second driving transistor, storage capacitance and light-emitting component；
First pole of the first switch transistor is electrically connected with data signal end, the grid of the first switch transistor
It is electrically connected with scanning signal end, the grid and institute of the second pole of the first switch transistor and the first driving transistor
The grid for stating the second driving transistor is electrically connected；
First pole of the storage capacitance is electrically connected with the grid of the first driving transistor, and the of the storage capacitance
Two poles are electrically connected with the first power input；
The first of first pole of the first driving transistor and the second driving transistor is extremely with described first
Power input electrical connection, it is described first driving transistor the second pole and it is described second driving transistor second extremely with
The light-emitting component connection；
Wherein, the threshold voltage of the first driving transistor is greater than the threshold voltage of the second driving transistor, institute
State carrier mobility of the carrier mobility lower than the first driving transistor of the second driving transistor.
Second aspect, the embodiment of the invention also provides a kind of display panels, including described in any embodiment of that present invention
Pixel circuit, scan line and data line；
The scanning signal end is electrically connected with scan line, and the data signal end is electrically connected with the data line.
The third aspect, the embodiment of the invention also provides a kind of driving methods of pixel circuit, are applied to the present invention such as and appoint
Pixel circuit described in embodiment of anticipating；
The driving method includes:
The first switch transistor receives the scan enable signal that the scanning signal end provides, by data signal transmission
To the grid of the first driving transistor and the grid of the second driving transistor；
The data-signal includes in multiple preset high gray data-signals and multiple preset low gray scale data signals
One kind；
When the data-signal is high gray data-signal, the first driving transistor and the second driving crystal
Pipe is on state；
When the data-signal is low gray scale data signal, the first driving transistor is in off state, described
Second driving transistor is in the conductive state.
The embodiment of the present invention is connected by the first driving transistor of setting and the second driving coupled in parallel, and the first driving
The threshold voltage of transistor is greater than the threshold voltage of the second driving transistor, and the carrier mobility of the second driving transistor is lower than
The carrier mobility of first driving transistor can only drive the second driving when data-signal is low gray scale data signal
Transistor provides driving current to light-emitting component, and since the second driving transistor is more accurate to the control of driving current, makes
It obtains light-emitting component and obtains finer low ash rank driving current.Compared with prior art, the embodiment of the present invention improves display
Image hierarchy sense of the panel in low ash rank, extends the brightness range of light-emitting component, improves the display image quality of display panel.
In addition, in embodiments of the present invention, the first driving transistor and the second driving coupled in parallel connection share first
Switching transistor, the first power input and storage capacitance are opened without being respectively set two set first for two driving transistors
Close transistor, the first power input and storage capacitance.Pixel circuit provided in an embodiment of the present invention is ensuring circuit structure letter
Under the premise of list, the precise controlling in low ash rank to light-emitting component, therefore, pixel provided by the embodiment of the present invention are realized
The application difficulty of circuit is lower, has biggish application value in practical applications.
Detailed description of the invention
Fig. 1 is a kind of curve of the luminous efficiency of micro- light emitting diode provided in an embodiment of the present invention with current density change
Schematic diagram；
Fig. 2 is a kind of structural schematic diagram of pixel circuit provided in an embodiment of the present invention；
Fig. 3 is the current-voltage of a kind of first driving transistor and the second driving transistor provided in an embodiment of the present invention
Graph of relation；
Fig. 4 is the structural schematic diagram of another pixel circuit provided in an embodiment of the present invention；
Fig. 5 is a kind of driver' s timing figure of pixel circuit provided in an embodiment of the present invention；
Fig. 6 is a kind of structural schematic diagram of display panel provided in an embodiment of the present invention；
Fig. 7 is that the film layer structure of a kind of first driving transistor and the second driving transistor provided in an embodiment of the present invention shows
It is intended to.
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.
As described in background, there is image hierarchy sense difference when low ash rank in existing display panel, through inventing
People is the study found that the reason of problem occur is, existing pixel circuit is in low ash rank to the control difficulty of light-emitting component
It is larger.
Below to be carried out for micro- light emitting diode (Micro Light Emitting Diode, micro-LED/ μ LED)
Illustrate, Fig. 1 is that a kind of luminous efficiency of micro- light emitting diode provided in an embodiment of the present invention is shown with the curve of current density change
It is intended to.Referring to Fig. 1, the luminous efficiency that curve 11 is μ LED is with the curve of current density change, by curve 11 in dotted line frame 12
Part can be seen that under low current density, the luminous efficiency of μ LED drastically reduces.Wherein, current density characterization flows through μ
The size of the driving current of LED, driving current reduce with the reduction of current density, for example, in high gray, the electric current of μ LED
For 2 μ A, current density is 100 μ A/m2, brightness 200nit；In low ash rank, if luminous efficiency is kept constant, the electricity of μ LED
Stream is 1 μ A, and current density is 50 μ A/m2, brightness 100nit；However, luminous efficiency reduces, μ LED due in low ash rank
Electric current be 1 μ A, current density be 50 μ A/m2, brightness is only 50nit.It can be seen that when the brightness of light-emitting component is by high gray
When to low ash rank, the grayscale span (brightness change) of light-emitting component is larger, and light-emitting component is in identical grayscale span conversely speaking,
Under, drive current variations when low ash rank are smaller, that is to say, that same grayscale span, the change of driving current in low ash rank
Change is smaller, and which increases pixel circuits to the difficulty of gray scale control.Existing pixel circuit cannot achieve hair when to low ash rank
The brightness of optical element is precisely controlled, and therefore, display panel is easy to appear the problem of low ash rank image hierarchy sense difference, leads to image
Distortion to input signal.
In view of this, the embodiment of the invention provides a kind of pixel circuit, which is suitable for driving μ LED, organic
Light emitting diode (Organic Light-Emitting Diode, OLED) or light emitting diode (Light-Emitting
Diode, LED).Fig. 2 is a kind of structural schematic diagram of pixel circuit provided in an embodiment of the present invention.Referring to fig. 2, the pixel circuit
Including first switch transistor TS1, the first driving transistor TD1, the second driving transistor TD2, storage capacitance C and light-emitting component
D.The first pole of first switch transistor TS1 is electrically connected with data signal end Data, the grid of first switch transistor TS1 with sweep
Retouch signal end Scan electrical connection, the grid and second of the second pole of first switch transistor TS1 and the first driving transistor TD1
The grid of driving transistor TD2 is electrically connected；The first pole of storage capacitance C is electrically connected with the grid of the first driving transistor TD1,
The second pole of storage capacitance C is electrically connected with the first power input VDD；The first pole and second of first driving transistor TD1
Driving transistor TD2's first extremely be electrically connected with the first power input VDD, first drive the second pole of transistor TD1 with
And second driving transistor TD2 second extremely connect with light-emitting component D.And first driving transistor TD1 threshold voltage
Vth1 is greater than the threshold voltage vt h2 of the second driving transistor TD2, and the carrier mobility of the second driving transistor TD2 is lower than the
The carrier mobility of one driving transistor TD1.
Fig. 3 is the current-voltage of a kind of first driving transistor and the second driving transistor provided in an embodiment of the present invention
Graph of relation.Referring to Fig. 3, abscissa is to drive the gate-source voltage of transistor poor, and ordinate is the drain-source for driving transistor
Electrode current, curve 21 are the transfer characteristic curve of the first driving transistor TD1, and curve 22 is turning for the second driving transistor TD2
Characteristic curve is moved, as seen from Figure 3, the threshold voltage vt h1 of the first driving transistor TD1 is greater than the second driving transistor TD2
Threshold voltage vt h2, therefore, the on state of the first driving transistor TD1 and the second driving transistor TD2 can be different.
Wherein, the first driving transistor TD1 and the second driving transistor TD2 is the mode being connected in parallel, and the first driving is brilliant
The driving of body pipe TD1 and second transistor TD2 adjusts the driving current of light-emitting component D jointly.Illustratively, data signal end Data
The voltage of the data-signal of offer is Vdata, and the first supply voltage that the first power input VDD is provided is Vdd.Pixel electricity
The driving method on road is that first switch transistor TS1 receives the scan enable signal that scanning signal end Scan is provided, and data are believed
Number voltage Vdata be transmitted to the first driving transistor TD1 grid and second driving transistor TD2 grid；Data-signal
Including one of multiple preset high gray data-signals and multiple preset low gray scale data signals；When data-signal is height
When gray scale data signal, the first driving transistor TD1 and the second driving transistor TD2 are on state；Work as data-signal
When for low gray scale data signal, Vdata-Vdd-Vth1<0, Vdata-Vdd-Vth2>0, at this point, at the first driving transistor TD1
In off state, the second driving transistor TD2 is in the conductive state, and the first driving transistor TD1 is no longer provided to light-emitting component D
Driving current, the driving current of light-emitting component D is only by the second driving transistor TD2 control.
When data-signal is low gray scale data signal, since the carrier mobility of the second driving transistor TD2 is lower than
The carrier mobility of first driving transistor TD1, therefore, same grayscale span, the electricity of corresponding second driving transistor TD2
Span is pressed to be greater than the first driving transistor TD1 voltage span.It can be seen that when data-signal is low gray scale data signal, only
Driving current is provided to light-emitting component D using the second driving transistor TD2, the difficulty to gray scale control is reduced, is conducive to picture
Plain circuit is precisely controlled light-emitting component D, and light-emitting component D can obtain finer low ash rank driving current.
The embodiment of the present invention is connected in parallel by the first driving transistor TD1 of setting and the second driving transistor TD2, and the
The threshold voltage of one driving transistor TD1 is greater than the threshold voltage of the second driving transistor TD2, the second driving transistor TD2's
Carrier mobility lower than first driving transistor TD1 carrier mobility, can data-signal be low ash order it is believed that
Number when, only drive second driving transistor TD2 to light-emitting component D provide driving current, and due to second driving TD2 pairs of transistor
The control of driving current is more accurate, so that light-emitting component D obtains finer low ash rank driving current.With prior art phase
Than the embodiment of the present invention improves image hierarchy sense of the display panel in low ash rank, extends the brightness model of light-emitting component D
It encloses, improves the display image quality of display panel.
In addition, in embodiments of the present invention, the first driving transistor TD1 and the second driving transistor TD2 are connected in parallel, altogether
With first switch transistor TS1, the first power input VDD and storage capacitance C, set respectively without being directed to two driving transistors
Set two sets of first switch transistor TS1, the first power input VDD and storage capacitance C.Pixel electricity provided in an embodiment of the present invention
Road realizes the precise controlling in low ash rank to light-emitting component D, therefore, this hair under the premise of ensuring that circuit structure is simple
The application difficulty of pixel circuit provided by bright embodiment is lower, has biggish application value in practical applications.
On the basis of the above embodiments, optionally, first drive transistor TD1 for low-temperature polycrystalline silicon transistor, second
Driving transistor TD2 is oxide semi conductor transistor.Wherein, using low temperature polycrystalline silicon (Low Temperature Poly-
Silicon, LTPS) technology preparation first driving transistor TD1 carrier mobility it is higher, and by first drive
The channel doping process of transistor TD1 makes the threshold voltage that can promote the first driving transistor TD1, so that the first driving crystal
The threshold voltage of pipe TD1 is higher than the threshold voltage of the second driving transistor TD2.Using the second of oxide semiconductor technology preparation
Drive the mobility of the carrier of transistor TD2 lower, oxide semiconductor for example can be indium gallium zinc oxide (Indium
Gallium Zinc Oxide, IGZO).Low-temperature polycrystalline silicon transistor provided in an embodiment of the present invention and oxide semiconductor crystal
Pipe can be prepared on the basis of prior art, and cost is relatively low, is easily achieved, and therefore, the embodiment of the present invention is conducive to
The image hierarchy sense and display image quality for promoting display panel in low ash rank are realized using lower process costs.
On the basis of the various embodiments described above, optionally, first drives the threshold voltage of transistor TD1 for Vth1, and second
The threshold voltage for driving transistor TD2 is Vth2, Vth1-Vth2 > a, wherein the range of a is 1V~2V, it is preferable that a's takes
Value is 1V.Wherein, if the value of a is larger, i.e., the grayscale span only by the second driving transistor TD2 control is larger, needs second
Driving transistor TD2 is capable of providing biggish driving current, however, due to the carrier mobility of the second driving transistor TD2
It is lower, it needs the larger of the second driving transistor TD2 setting increasing the area of pixel circuit in this way；If the value of a compared with
Small, i.e., the grayscale span only by the second driving transistor TD2 control is smaller, cannot be when data-signal is low gray scale data signal
It is switched in time only by the second driving transistor TD2 control, will affect the effect of the low gray scale control of pixel circuit in this way.The present invention
Embodiment reduces the second driving transistor TD2 in this way, on the basis of ensuring the effect of the low gray scale control of pixel circuit
Area be conducive to high pixel density (the Pixels Per of display panel to reduce the occupied space of pixel circuit
Inch, PPI) design.
Fig. 4 is the structural schematic diagram of another pixel circuit provided in an embodiment of the present invention.Referring to fig. 4, in above-mentioned each reality
On the basis of applying example, optionally, pixel circuit further includes second switch transistor TS2, the grid of second switch transistor TS2 with
LED control signal end Emit electrical connection, the second pole of the first pole of second switch transistor TS2 and the first driving transistor TD1
Electrical connection, the second pole of second switch transistor TS2 is electrically connected with the first pole of light-emitting component D, the second pole of light-emitting component D and
Second source input terminal VEE electrical connection.Setting of embodiment of the present invention second switch transistor TS2 is series at driving transistor (packet
Include the first driving transistor TD1 and second driving transistor TD2) and light-emitting component D between, can be in storage capacitance charging process
In, control light-emitting component D and driving transistor disconnect, and are conducive to avoid to drive light-emitting component D hair when driving current is unstable
Light to accelerate the charging rate of storage capacitance C, and improves the control effect to light-emitting component D.
Fig. 5 is a kind of driver' s timing figure of pixel circuit provided in an embodiment of the present invention.Referring to fig. 4 and Fig. 5, exemplary
Ground, the first driving transistor TD1, the second driving transistor TD2, first switch transistor TS1 and second switch transistor TS2 are equal
For N-type transistor, the first supply voltage Vdd is high potential, and second source voltage Vee is low potential.The driving of the pixel circuit
Method includes: first stage t1 and second stage t2.
First stage t1, also referred to as data write phase, LED control signal Vemit are low potential, and scanning signal Vscan is
High potential (scan enable signal)；Second switch transistor TS2 in response to LED control signal Vemit low potential and turn off,
One switching transistor TS1 in response to scanning signal Vscan high potential and be connected, the high potential of data-signal Vdata passes through first
The grid of the first driving transistor TD1 of switching transistor TS1 write-in and the second driving transistor TD2, the first driving transistor TD1
It being increased with the grid voltage of the second driving transistor TD2, storage capacitance C stores the high potential of data-signal Vdata, until the
The grid potential of one driving transistor TD1 and the second driving transistor TD2 are equal with the current potential of data-signal Vdata.
Second stage t2, also referred to as light emitting phase, LED control signal Vemit are high potential, and scanning signal Vscan is low electricity
Position, storage capacitance C keep the current potential of first stage t1；First switch transistor TS1 in response to scanning signal Vscan low potential and
Shutdown, second switch transistor TS2 response LED control signal Vemit high potential and be connected, first driving transistor TD1 with
Second driving transistor TD2 in response to the first pole of storage capacitance C high potential and be connected, driving current through for generation second is opened
It closes transistor TS2 driving light-emitting component D to shine, to realize the display function of display panel.
It is driven it should be noted that schematically illustrating the first driving transistor TD1 and second in the above embodiments
Dynamic transistor TD2 is N-type transistor, not limitation of the invention.In other embodiments, the first driving can also be set
The driving of transistor TD1 and second transistor TD2 is P-type transistor, can according to need set in practical applications.
The embodiment of the invention also provides a kind of display panels.Fig. 6 is a kind of display panel provided in an embodiment of the present invention
Structural schematic diagram.Referring to Fig. 6, illustratively, display panel can be micro- LED display panel, organic light-emitting diodes
Pipe display panel or LED display panel.The display panel includes pixel electricity provided by any embodiment of the invention
The scanning signal end of road 1, scan line 2 and data line 3, pixel circuit 1 is electrically connected with scan line 2, the data-signal of pixel circuit 1
End is electrically connected with data line 3.Wherein, scan line 2 and data line 3, which intersect, limits pixel circuit 1, and scanning signal is passed by scan line
2 transport to the scanning signal end of pixel circuit 1, and data-signal is transmitted to the data signal end of pixel circuit 1 by data line 3.
The embodiment of the present invention drives coupled in parallel to connect by the first driving transistor and second in setting pixel circuit 1
It connects, and the threshold voltage of the first driving transistor is greater than the threshold voltage of the second driving transistor, the load of the second driving transistor
Flow transport factor lower than first driving transistor carrier mobility, can data-signal be low gray scale data signal when,
Only the second driving transistor of driving provides driving current, and the control due to the second driving transistor to driving current to light-emitting component
Make it is more accurate so that light-emitting component obtains finer low ash rank driving current.Compared with prior art, the present invention is implemented
Example improves image hierarchy sense of the display panel in low ash rank, extends the brightness range of light-emitting component, improves display surface
The display image quality of plate.
In addition, in embodiments of the present invention, the first driving transistor and the second driving coupled in parallel connection share first
Switching transistor, the first power input and storage capacitance are opened without being respectively set two set first for two driving transistors
Close transistor, the first power input and storage capacitance.Pixel circuit provided in an embodiment of the present invention is ensuring circuit structure letter
Under the premise of list, the precise controlling in low ash rank to light-emitting component, therefore, pixel provided by the embodiment of the present invention are realized
The application difficulty of circuit is lower, is applicable to the display panel of high PPI, has biggish application value in practical applications.
With continued reference to Fig. 6, on the basis of the above embodiments, optionally, which further includes grid electrode drive module 4
With source drive module 5.Pixel circuit 1 receives the scanning signal that grid electrode drive module 4 is sent by corresponding scan line 2, leads to
It crosses corresponding data line 3 and receives the data-signal that source drive module 5 is sent, display panel realizes display function according to this.
Fig. 7 is that the film layer structure of a kind of first driving transistor and the second driving transistor provided in an embodiment of the present invention shows
It is intended to.Referring to Fig. 7, on the basis of the various embodiments described above, optionally, the first pole 33 and the second pole of the first driving transistor
34 and second driving transistor the first pole 43 and the second pole 44 be respectively positioned on the first driving transistor grid 32 it is same
Side, the first pole 33 of the first driving transistor and the first pole 43 of the second driving transistor are same electrode, the first driving crystal
Second pole 34 of pipe and the second pole 44 of the second driving transistor are same electrode.
Specifically, the active layer 31 of the first driving transistor is formed in the side of substrate 100；In the first driving transistor
Active layer 31 forms the first insulating layer 200 far from the side of substrate 100, in side shape of first insulating layer 200 far from substrate 100
At the common gate 32/42 of the first driving transistor and the second driving transistor；In common gate 32/42 far from substrate 100
Side forms second insulating layer 300, forms having for the second driving transistor far from the side of substrate 100 in second insulating layer 300
Active layer 41；Third insulating layer 400, the first driving are formed far from the side of substrate 100 in the active layer 41 of the second driving transistor
First pole 33/43 of transistor and the second driving transistor passes through third insulating layer 400, second insulating layer 300 and the first insulation
Layer 200, forms the first via hole 311, and the first pole 33/43 is connect by the active layer 31 of the first via hole 311 and the first driving transistor
Touching；Second pole 34/44 of the first driving transistor and the second driving transistor passes through third insulating layer 400, second insulating layer 300
With the first insulating layer 200, the second via hole 312 is formed, the second pole 34/44 drives transistor by the second via hole 312 and first
Active layer 31 contacts；First pole 33/43 of the first driving transistor and the second driving transistor passes through third insulating layer 400, shape
At third via hole 411, the first pole 33/43 is contacted by third via hole 411 with the active layer 41 of the second driving transistor；First drives
Second pole 34/44 of dynamic transistor and the second driving transistor passes through third insulating layer 400, forms the 4th via hole 412, the second pole
34/44 is contacted by the 4th via hole 412 with the active layer 41 of the second driving transistor.Therefore, the first driving transistor is by active
Layer 31, grid 32, the first pole 33 and the second pole 34 stack gradually to be formed, and the second driving transistor is by grid 42, active layer 41, the
One pole 43 and the second pole 44 stack gradually to be formed.
The grid 32 of setting of the embodiment of the present invention the first driving transistor and the grid 42 of the second driving transistor are multiplexed, the
One drives the second of the first pole 43 multiplexing of the first pole 33 of transistor and the second driving transistor and the first driving transistor
Pole 34 and the second pole 44 of the second driving transistor are multiplexed, and are not only reduced one layer of active layer and are correspondingly arranged with the active layer
The setting of insulating layer also reduces the setting of one layer of source-drain layer and the active layer being correspondingly arranged with the source-drain layer, further decreases
First driving transistor and the second driving transistor occupied film layer quantity, to be conducive to the lightening of display panel.
In addition, the first via hole 311, the second via hole 312, third via hole 411 and the 4th via hole 412 can with along in manufacture craft it is complete
At, be conducive to simplify processing step, reduce process costs.
The embodiment of the invention also provides a kind of driving method of pixel circuit, the driving method of the pixel circuit is suitable for
Pixel circuit provided by any embodiment of the invention.The driving method of the pixel circuit includes: that first switch transistor receives
The scan enable signal that scanning signal end provides, data signal transmission is brilliant to the grid of the first driving transistor and the second driving
The grid of body pipe.
Wherein, data-signal includes in multiple preset high gray data-signals and multiple preset low gray scale data signals
One kind, when data-signal be high gray data-signal when, first driving transistor and second driving transistor be in conducting
State；When data-signal is low gray scale data signal, the first driving transistor is in off state, and second drives at transistor
In on state.
The embodiment of the present invention is connected by the first driving transistor of setting and the second driving coupled in parallel, and the first driving
The threshold voltage of transistor is greater than the threshold voltage of the second driving transistor, and the carrier mobility of the second driving transistor is lower than
The carrier mobility of first driving transistor, when data-signal is low gray scale data signal, the first driving transistor is in
Off state, the second driving transistor is in the conductive state, and the second driving transistor is only driven to provide driving electricity to light-emitting component
Stream, and since the second driving transistor is more accurate to the control of driving current so that light-emitting component obtain it is finer low
Grayscale driving current.Compared with prior art, the embodiment of the present invention improves image hierarchy sense of the display panel in low ash rank,
The brightness range for extending light-emitting component improves the display image quality of display panel.
On the basis of the above embodiments, optionally, when data-signal is low gray scale data signal, Vdata-Vdd-
Vth1<0, Vdata-Vdd-Vth2>0, Vdata are the voltage of data signal end, and VDD is the power supply that the first power input line provides
Voltage, Vth1 are the threshold voltage of the first driving transistor, and Vth2 is the threshold voltage of the second driving transistor.The present invention is implemented
For example in this way, ensuring when data-signal is low gray scale data signal, the first driving transistor is in off state, and second
It drives transistor in the conductive state, ensures that image hierarchy sense of the display panel in low ash rank.
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 (10)
1. a kind of pixel circuit, which is characterized in that including first switch transistor, the first driving transistor, the second driving crystal
Pipe, storage capacitance and light-emitting component；
First pole of the first switch transistor is electrically connected with data signal end, the grid of the first switch transistor with sweep
Retouch signal end electrical connection, the grid and described the of the second pole of the first switch transistor and the first driving transistor
The grid of two driving transistors is electrically connected；
First pole of the storage capacitance is electrically connected with the grid of the first driving transistor, the second pole of the storage capacitance
It is electrically connected with the first power input；
It is described first driving transistor the first pole and it is described second driving transistor first extremely with first power supply
Input terminal electrical connection, it is described first driving transistor the second pole and it is described second driving transistor second extremely with it is described
Light-emitting component connection；
Wherein, the threshold voltage of the first driving transistor is greater than the threshold voltage of the second driving transistor, and described the
Carrier mobility of the carrier mobility of two driving transistors lower than the first driving transistor.
2. pixel circuit according to claim 1, which is characterized in that the first driving transistor is low-temperature polysilicon silicon wafer
Body pipe, the second driving transistor is oxide semi conductor transistor.
3. pixel circuit according to claim 2, which is characterized in that it is described first driving transistor threshold voltage be
The threshold voltage of Vth1, the second driving transistor are Vth2, Vth1-Vth2 > a；
Wherein, the range of a is 1V~2V.
4. pixel circuit according to claim 1, which is characterized in that further include second switch transistor；
The grid of the second switch transistor is electrically connected with LED control signal end, the first pole of the second switch transistor
It is electrically connected with the second pole of the first driving transistor, the second pole and the light-emitting component of the second switch transistor
The electrical connection of first pole, the second pole of the light-emitting component is electrically connected with second source input terminal.
5. pixel circuit according to claim 1, which is characterized in that the first driving transistor and second driving
Transistor is P-type transistor；
Or the first driving transistor and the second driving transistor are N-type transistor.
6. a kind of display panel, which is characterized in that including the described in any item pixel circuits of claim 1-5, scan line sum number
According to line；
The scanning signal end is electrically connected with scan line, and the data signal end is electrically connected with the data line.
7. display panel according to claim 6, which is characterized in that it is described first driving transistor active layer with it is described
The active layer of second driving transistor is overlapping；The grid of the grid of the first driving transistor and the second driving transistor
For same grid, and it is located between the active layer of the first driving transistor and the active layer of the second driving transistor.
8. display panel according to claim 7, which is characterized in that the first pole and second of the first driving transistor
The first pole and the second pole of pole and the second driving transistor are respectively positioned on the same of the grid of the first driving transistor
Side, the first extremely same electrode of the first pole of the first driving transistor and the second driving transistor, described first
Drive the second pole of transistor and the second extremely same electrode of the second driving transistor.
9. a kind of driving method of pixel circuit, which is characterized in that be applied to the pixel electricity as described in claim any one of 1-5
Road；
The driving method includes:
The first switch transistor receives the scan enable signal that the scanning signal end provides, by data signal transmission to institute
State the grid of the first driving transistor and the grid of the second driving transistor；
The data-signal includes one in multiple preset high gray data-signals and multiple preset low gray scale data signals
Kind；
When the data-signal is high gray data-signal, the first driving transistor and the second driving transistor are equal
It is in the conductive state；
When the data-signal is low gray scale data signal, the first driving transistor is in off state, and described second
Drive transistor in the conductive state.
10. the driving method of pixel circuit according to claim 9, which is characterized in that
When the data-signal is low gray scale data signal, Vdata-Vdd-Vth1<0, Vdata-Vdd-Vth2>0, Vdata
For the voltage of the data signal end, Vdd is the supply voltage that the first power input line provides, and Vth1 is that first driving is brilliant
The threshold voltage of body pipe, Vth2 are the threshold voltage of the second driving transistor.
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| CN201910818934.9A CN110473494B (en) | 2019-08-30 | 2019-08-30 | Pixel circuit, display panel and driving method of pixel circuit |
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| CN201910818934.9A CN110473494B (en) | 2019-08-30 | 2019-08-30 | Pixel circuit, display panel and driving method of pixel circuit |
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