CN110491334A - Pixel circuit, the driving method of pixel circuit, display panel and display device - Google Patents
Pixel circuit, the driving method of pixel circuit, display panel and display device Download PDFInfo
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- CN110491334A CN110491334A CN201910818950.8A CN201910818950A CN110491334A CN 110491334 A CN110491334 A CN 110491334A CN 201910818950 A CN201910818950 A CN 201910818950A CN 110491334 A CN110491334 A CN 110491334A
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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]
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Abstract
The invention discloses a kind of pixel circuit, the driving method of pixel circuit, display panel and display devices.First exclusive rights.Pixel circuit includes the first driving transistor being series between the first power supply signal input and the first pole of light emitting diode and the second driving transistor；For the first data signal transmission to first to be driven to the first switch transistor of the grid of transistor under the control of the enable signal of the first scanning signal；For the second data signal transmission to second to be driven to the second switch transistor of the grid of transistor under the control of the enable signal of the second scanning signal；The channel width-over-length ratio of first driving transistor is a, and the channel width-over-length ratio of the second driving transistor is b, wherein a/b >=2.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 diode, improves the display image quality of display panel.
Description
Technical field
The present embodiments relate to display technology more particularly to a kind of pixel circuits, the driving method of pixel circuit, display
Panel and display device.
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 a kind of pixel circuit, the driving method of pixel circuit, display panel and display device, aobvious to be promoted
Show image hierarchy sense of the panel in low ash rank, promotes the display image quality of display panel.
In a first aspect, the embodiment of the invention provides pixel circuit, including the first driving transistor, the second driving crystal
Pipe, first switch transistor, second switch transistor and light emitting diode；
The first driving transistor and the second driving transistor series connection, and the first driving transistor and described
Second driving strings of transistors is coupled between the first power supply signal input and the first pole of the light emitting diode；
The first switch transistor is used for the first data-signal under the control of the enable signal of the first scanning signal
It is transmitted to the grid of the first driving transistor；
The second switch transistor is used for the second data-signal under the control of the enable signal of the second scanning signal
It is transmitted to the grid of the second driving transistor；Second pole of the light emitting diode is electrically connected with second source signal input part
It connects；
The channel width-over-length ratio of the first driving transistor is a, and the channel width-over-length ratio of the second driving transistor is b,
Wherein, a/b >=2.
Second aspect is applied to the embodiment of the invention also provides the driving method of pixel circuit as the present invention is any real
Apply pixel circuit described in example；
The driving method includes:
To the first data-signal of gate transport of the first driving transistor, to the gate transport second of the second driving transistor
Pass through identical driving current in data-signal, the first driving transistor and the second driving transistor；
The driving current drives lumination of light emitting diode；
Wherein, the first driving transistor and the second driving transistor are respectively to the adjusting essence of the driving current
Degree is different.
The third aspect, the embodiment of the invention also provides a kind of display panels, including multiple such as any embodiment of that present invention
The pixel circuit.
Fourth aspect, the embodiment of the invention also provides a kind of display devices, including as described in any embodiment of that present invention
Display panel.
The embodiment of the present invention is coupled to the first power supply signal by the first driving transistor of setting and the second driving strings of transistors
Between input terminal and the first pole of light emitting diode, the channel width-over-length ratio of the first driving transistor is the ditch of the second driving transistor
Twice or more of road breadth length ratio and first driving transistor and second driving transistor driven by independent data-signal
Streaming current modulation, realizes the first driving transistor and the second driving transistor cooperation is modulated driving current.Its
In, the second driving transistor carries out main modulation to driving current, and the first driving transistor is finely adjusted system to driving current, thus
Taking into account for wide range and fineness is realized, is conducive to modulate the bigger and finer driving current of range, in the first number
It is believed that number and the second data-signal be low gray scale data signal when, since brightness regulation is finer, advantageously reduce to grayscale
The difficulty of control is precisely controlled light emitting diode to be conducive to pixel circuit, and light emitting diode can obtain more smart
Thin low ash rank driving current.Compared with prior art, the embodiment of the present invention improves image of the display panel in low ash rank
Stereovision extends the brightness range of light emitting diode, improves the display image quality of display panel.
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 structural schematic diagram of another pixel circuit provided in an embodiment of the present invention；
Fig. 4 is a kind of driver' s timing schematic diagram of pixel circuit provided in an embodiment of the present invention；
Fig. 5 is the structural schematic diagram of another pixel circuit provided in an embodiment of the present invention；
Fig. 6 is the driver' s timing schematic diagram of another pixel circuit provided in an embodiment of the present invention；
Fig. 7 is a kind of flow diagram of the driving method of pixel circuit provided in an embodiment of the present invention；
Fig. 8 is a kind of structural schematic diagram of display panel provided in an embodiment of the present invention；
Fig. 9 is a kind of structural schematic diagram of display device provided in an embodiment of the present invention.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched
The specific embodiment stated is used only for explaining the present invention rather than limiting the invention.It also should be noted that in order to just
Only the parts related to the present invention are shown in description, attached drawing rather than entire infrastructure.
As described in background, there is image hierarchy sense difference when low ash rank in existing display panel, through inventing
For people the study found that the reason of problem occur is, existing pixel circuit is difficult to the control of light emitting diode in low ash rank
It spends 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 diode is by high ash
When rank is to low ash rank, the grayscale span (brightness change) of light emitting diode is larger, and light emitting diode is in identical ash conversely speaking,
Under rank span, drive current variations when low ash rank are smaller, that is to say, that same grayscale span drives electricity in low ash rank
The variation of stream is smaller, and which increases pixel circuits to the difficulty of gray scale control.Existing pixel circuit cannot achieve to low ash
The brightness of light emitting diode is precisely controlled when rank, and therefore, display panel is easy to appear the problem of low ash rank image hierarchy sense difference,
Lead to distortion of the image to input signal.
In view of this, the pixel circuit is suitable for driving μ LED or has the embodiment of the invention provides a kind of pixel circuit
Machine light emitting diode (Organic Light-Emitting Diode, OLED).Fig. 2 is a kind of picture provided in an embodiment of the present invention
The structural schematic diagram of plain circuit.Referring to fig. 2, the pixel circuit include first driving transistor TD1, second driving transistor TD2,
First switch transistor TS1, second switch transistor TS2 and light emitting diode D；First driving transistor TD1 and second drives
Dynamic transistor TD2 series connection, and the first driving transistor TD1 and the second driving transistor TD2 are series at the input of the first power supply signal
Between the first pole for holding VDD and light emitting diode D；First switch transistor TS1 is used for the enable signal in the first scanning signal
Control under by the first data signal transmission to first driving transistor TD1 grid；Second switch transistor TS2 is used for the
By the second data signal transmission to the grid of the second driving transistor TD2 under the control of the enable signal of two scanning signals；It shines
The second pole of diode D is electrically connected with second source signal input part VEE；First driving transistor TD1 channel width-over-length ratio be
The channel width-over-length ratio of a, the second driving transistor TD2 are b, wherein a/b >=2.
Wherein, the first driving transistor TD1 and the second driving transistor TD2 are series at the first power supply signal input VDD
Between the first pole of light emitting diode D, then, crystal is driven by the electric current of the first driving transistor TD1 and by second
The size of current of pipe TD2 is equal, and the first driving transistor TD1 and the second driving transistor TD2 are provided to light emitting diode D simultaneously
Driving current.
The channel width-over-length ratio of first driving transistor TD1 is a, and the channel width-over-length ratio of the second driving transistor TD2 is b, and
A/b >=2, that is to say, that the ditch road width that the channel width-over-length ratio of the first driving transistor TD1 is greater than the second driving transistor TD2 is long
Than.The relational expression Id=k1k2 (Vsg- | Vth |) of the breadth length ratio of driving current and transistor that transistor generates2, wherein Id
For the driving current that transistor generates, k1 is the constant being made of transistor inherent parameters, and k2 is the channel width-over-length ratio of transistor,
Vsg is the gate source voltage of transistor, and Vth is the threshold voltage of transistor, it follows that the channel width-over-length ratio and crystal of transistor
The driving current that pipe generates is positively correlated, and the driving current that the equivalent resistance due to transistor and transistor generate is in negative
It closes, therefore, the equivalent resistance of transistor and the channel width-over-length ratio of transistor are negatively correlated, and the second driving transistor TD2's is equivalent
Resistance is greater than the equivalent resistance of the first driving transistor TD1.
Illustratively, if a/b=10, the equivalent resistance that can be simply understood as the second driving transistor TD2 is the first drive
Ten times of the equivalent resistance of dynamic transistor TD1.Adjusting of the data-signal to the grid potential of driving transistor, is equivalent to driving
The adjusting of the equivalent resistance of transistor, and then adjust the driving current that driving transistor generates.And second drives transistor TD2's
Equivalent resistance is larger, and the adjustable range of equivalent resistance is also larger, and the degree of regulation of the equivalent resistance is poor, and therefore, second drives
Dynamic transistor TD2 is larger to the adjustable range of driving current and precision is poor；On the contrary, the equivalent electricity of the first driving transistor TD1
Resistance is smaller, and the adjustable range of equivalent resistance is also smaller, and the degree of regulation of equivalent resistance is preferable, therefore, the first driving transistor
TD1 is preferable to the degree of regulation of driving current and adjustable range is smaller.
It can thus be seen that by the cooperation of the first driving transistor TD1 and the second driving transistor TD2, it can be with
It realizes taking into account for wide range and fineness, modulates the bigger and finer driving current of range, wherein the second driving crystal
Pipe TD2 drives transistor as the main modulation (coarse modulated) of driving current, and the first driving transistor TD1 is as the micro- of driving current
Modulation driving transistor.When the first data-signal and the second data-signal are low gray scale data signal, more due to brightness regulation
Add finely, advantageously reduce the difficulty to gray scale control, light emitting diode D is precisely controlled to be conducive to pixel circuit,
Light emitting diode D can obtain finer low ash rank driving current.
First switch transistor TS1 under the control of the enable signal of the first scanning signal by the first data signal transmission extremely
The grid of first driving transistor TD1, second switch transistor TS2 is under the control of the enable signal of the second scanning signal by the
The grid of two data signal transmissions to the second driving transistor TD2, realizes the driving crystal of the first driving transistor TD1 and second
Pipe TD2 is controlled by independent data-signal, is conducive to the first driving transistor TD1's and the second driving transistor TD2
It is precisely controlled, so that the cooperation for realizing the driving of the first driving transistor TD1 and second transistor TD2 carries out driving current
Modulation.
The embodiment of the present invention is series at the first electricity by the first driving transistor TD1 of setting and the second driving transistor TD2
Between source signal input terminal VDD and the first pole of light emitting diode D, the channel width-over-length ratio of the first driving transistor TD1 is second
Drive twice or more and the first driving transistor TD1 and the second driving transistor of the channel width-over-length ratio of transistor TD2
TD2 carries out driving current modulation by independent data-signal, realizes the driving transistor of the first driving transistor TD1 and second
TD2 cooperation is modulated driving current.Wherein, second driving transistor TD2 to driving current carry out main modulation, first
Driving transistor TD1 is finely adjusted system to driving current, is advantageously implemented the modulation finer to driving current.With existing skill
Art is compared, and the embodiment of the present invention improves image hierarchy sense of the display panel in low ash rank, extends the bright of light emitting diode D
Range is spent, the display image quality of display panel is improved.
On the basis of the above embodiments, optionally, the range of a/b is 5~30.The embodiment of the present invention is in this way, one
Aspect is equivalent to and sets different for the breadth length ratio b of the driving of the breadth length ratio a and second transistor TD2 of the first driving transistor TD1
The order of magnitude, increase the first driving transistor TD1 breadth length ratio a and second driving transistor TD2 breadth length ratio b between difference
It is different, conducive to the effect for the difference modulation for realizing main modulation and fine tuning system；On the other hand, the first driving transistor TD1 and second drives
Dynamic transistor TD2 is mutually coordinated to the degree of regulation of driving current, if the degree of regulation and second of the first driving transistor TD1 drives
The degree of regulation difference of dynamic transistor TD2 is larger, then from the point of view of the coarse adjustment interval for driving transistor TD2 relative to second, first is driven
It may be every too small between the fine tuning of the fine tuning system of dynamic transistor TD1, it might even be possible to ignore, at this point, the first driving transistor TD1 fine tuning
Effect processed is poor.To sum up, the embodiment of the present invention further improves the first driving transistor by the value range of setting a/b
The driving of TD1 and second transistor TD2 is mutually coordinated, the effect fine-tuned to driving current.
It should be noted that respectively being applied in example in above-mentioned reality, schematically illustrates the first driving transistor TD1 and second and drive
Dynamic transistor TD2 cooperation provides driving current to light emitting diode D, not limitation of the invention.In other embodiments
In, multiple driving transistors can also be set and be connected in series in the first of the first power supply signal input VDD and light emitting diode D
Between pole, multiple modulation accuracy cooperations of multiple driving transistors provide driving current to light emitting diode D.Actually answering
It can be set as needed the quantity of concatenated driving transistor in.
In the above-described embodiments, the first driving transistor TD1, the second driving transistor TD2, first switch transistor TS1
It is just wherein several below to be illustrated with there are many set-up modes of second switch transistor TS2, but not as to of the invention
It limits.
With continued reference to Fig. 2, on the basis of the various embodiments described above, optionally, first driving transistor TD1 the first pole with
First power supply signal input VDD electrical connection, the second pole of the first driving transistor TD1 and the of the second driving transistor TD2
The electrical connection of one pole, the second pole of the second driving transistor TD2 and the first pole of light emitting diode D couple；First switch transistor
The first pole of TS1 is electrically connected with the first data signal end Data1, and the second pole of first switch transistor TS1 and the first driving are brilliant
The grid of body pipe TD1 is electrically connected, and the grid of first switch transistor TS1 is electrically connected with the first scanning signal end Scan1；Second opens
The first pole for closing transistor TS2 is electrically connected with the second data signal end Data2, the second pole of second switch transistor TS2 and the
The grid electrical connection of two driving transistor TD2, the grid of second switch transistor TS2 are electrically connected with the second scanning signal end Scan2
It connects.The embodiment of the present invention is series at first in this way, realizing the driving of the first driving transistor TD1 and second transistor TD2
Between power supply signal input VDD and the first pole of light emitting diode D and first switch transistor TS1 is in the first scanning letter
Number enable signal control under by the first data signal transmission to first driving transistor TD1 grid, second switch crystal
Pipe TS2 is under the control of the enable signal of the second scanning signal by the second data signal transmission to the second driving transistor TD2's
Grid.
With continued reference to Fig. 2, on the basis of the various embodiments described above, optionally, pixel circuit further include: first capacitor C1 and
Second capacitor C2；First capacitor C1 is used to keep the current potential of the grid of the first driving transistor TD1；Second capacitor C2 is for keeping
The current potential of the grid of second driving transistor TD2.The electricity that the embodiment of the present invention passes through the grid of the first driving of holding transistor TD1
The current potential of the grid of position and the second driving transistor TD2 remains unchanged, and can keep through the first driving transistor TD1 and second
The driving current of driving transistor TD2 remains unchanged, to be conducive to keep light emitting diode D continuous illumination.
On the basis of the various embodiments described above, optionally, the voltage of the first data-signal is D1, the electricity of the second data-signal
Pressure is D2, wherein D1 > D2.The relational expression Id=k1k2 of the breadth length ratio of driving current and transistor that transistor generates
(Vsg-|Vth|)2, the driving current of the first driving transistor TD1 is Id=k1a (Vdd-D1- | Vth1 |)2, wherein a
The channel width-over-length ratio of one driving transistor TD1, Vdd are the first power supply signal voltage of the first power supply signal input VDD input,
Vth1 is the threshold voltage of the first driving transistor TD1；The driving current of second driving transistor TD2 is Id=k1b (Vdd-
Vds1-D2-|Vth2|)2, wherein b is the channel width-over-length ratio of the second driving transistor TD2, and Vds1 is the first driving transistor
Voltage difference between the second pole and the first pole of TD1, Vth2 are the threshold voltage of the second driving transistor TD2；Due to a > b, institute
Be conducive to the driving that the driving of the first driving transistor TD1 and second transistor TD2 is generated with setting of embodiment of the present invention D1 > D2
Currents match.
With continued reference to Fig. 2, on the basis of the various embodiments described above, optionally, the first pole of first capacitor C1 and the first electricity
Source signal input terminal VDD electrical connection, the second pole of first capacitor C1 is electrically connected with the grid of the first driving transistor TD1, with reality
Existing first capacitor C1 keeps the current potential of the grid of the first driving transistor TD1.The first pole of second capacitor C2 and the first power supply
Signal input part VDD electrical connection, the second pole of the second capacitor C2 is electrically connected with the grid of the second driving transistor TD2, to realize
Second capacitor C2 keeps the current potential of the grid of the second driving transistor TD2.
On the basis of the various embodiments described above, optionally, the capacitance of first capacitor C1 is C1, the capacitor of the second capacitor C2
Value is C2, wherein C1 > C2.The capacitance that the second capacitor C2 is arranged in the embodiment of the present invention is less than the capacitance of first capacitor C1, can
To reduce time for charging to the second capacitor C2 of voltage D2 of the second data-signal, so that the voltage D1 of the first data-signal is to the
The voltage D2 of the charging time of one capacitor C1 and the second data-signal was closer to the charging time of the second capacitor C2, was conducive to
The grid potential for shortening the second driving transistor TD2 reaches the time of preset potential.Since the charging time of data-signal can shadow
The sweep time of pixel circuit is rung, and the sweep time of pixel circuit is longer, the pixel circuit of one frame picture of display panel scanning
Line number it is fewer, the embodiment of the present invention is in this way, reduce the charging time of storage capacitance, to advantageously reduce pixel electricity
The sweep time on road, increase the line number of the pixel circuit of frame picture scanning, so that the pixel for being conducive to be promoted display panel is close
It spends (Pixels Per Inch, PPI).
On the basis of the various embodiments described above, optionally, the first scanning signal end Scan1 is multiplexed with the second scanning signal end
Scan2, the i.e. enable signal of the first scanning signal end Scan1 and the enable signal of the second scanning signal end Scan2 can be simultaneously
The grid of first switch transistor TS1 and the grid of second switch transistor TS2 is written, to control first switch transistor
TS1 and second switch transistor TS2 are simultaneously turned on and are turned off, and the first data-signal and the second data-signal can be write simultaneously respectively
Enter the grid of the first driving transistor TD1 and the grid of the second driving transistor TD2, so that the first driving transistor TD1 and the
Two driving transistor TD2 can be simultaneously turned on, and generate driving current, to ensure that light emitting diode D shines.In addition, the present invention is real
It applies the first scanning signal end Scan1 of example setting and is multiplexed with the second scanning signal end Scan2, it is possible to reduce with the second scanning signal end
The quantity of the scan line of Scan2 connection, to be conducive to the wiring of display panel.
Fig. 3 is the structural schematic diagram of another pixel circuit provided in an embodiment of the present invention.Referring to Fig. 3, in above-mentioned each reality
On the basis of applying example, optionally, pixel circuit further includes the first light emitting control transistor TS3, the first light emitting control transistor TS3
For control the conducting in the driving current path between the first power supply signal input VDD and the first pole of light emitting diode D with
Shutdown can control the driving transistor of light emitting diode D and first in the charging process of first capacitor C1 and the second capacitor C2
The driving of TD1 and second transistor TD2 is disconnected, and is conducive to avoid to drive light emitting diode D to shine when driving current is unstable, from
And the charging rate of first capacitor C1 and the second capacitor C2 are accelerated, and improve the control effect to light emitting diode D.
With continued reference to Fig. 3, optionally, the grid of the first light emitting control transistor TS3 is electrically connected with light emitting control end Emit,
The first pole of first light emitting control transistor TS3 is electrically connected with the second pole of the second driving transistor TD2, and the first light emitting control is brilliant
The second pole of body pipe TS3 is electrically connected with the first pole of light emitting diode D, is controlled with realizing using the first light emitting control transistor TS3
Make the conducting and shutdown in the driving current path between the first power supply signal input VDD and the first pole of light emitting diode D
Effect.
Fig. 4 is a kind of driver' s timing schematic diagram of pixel circuit provided in an embodiment of the present invention.Referring to Fig. 3 and Fig. 4, example
Property, the first driving transistor TD1, the second driving transistor TD2, first switch transistor TS1, second switch transistor TS2
It is N-type transistor, the first supply voltage of the first power supply signal input VDD input with the first light emitting control transistor TS3
Vdd is high potential, and the second source voltage Vee of second source signal input part VEE input is low potential.The drive of the pixel circuit
Dynamic 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, the first scanning signal
Vscan1 is high potential (scan enable signal), and the second scanning signal Vscan2 is high potential (scan enable signal)；Third is opened
It closes transistor TS3 to turn off in response to the low potential of LED control signal Vemit, the first scanning of first switch transistor TS1 response
The high potential of signal Vscan1 and be connected, the high potential of the first data-signal Vdata1 passes through first switch transistor TS1 and is written
The grid voltage of the grid of first driving transistor TD1, the first driving transistor TD1 increases, the first number of first capacitor C1 storage
It is believed that the voltage D1 of number Vdata1, until the electricity of the grid potential of the first driving transistor TD1 and the first data-signal Vdata1
Position is equal；Second switch transistor TS2 responds the high potential of the second scanning signal Vscan2 and is connected, the second data-signal
Grid of the high potential of Vdata2 by the second driving of second switch transistor TS2 write-in transistor TD2, the second driving transistor
The grid voltage of TD2 increases, and the second capacitor C2 stores the voltage D2 of the second data-signal Vdata2, until the second driving transistor
The grid potential of TD2 is equal with the current potential of the second data-signal Vdata2.
Second stage t2, also referred to as light emitting phase, LED control signal Vemit are high potential, the first scanning signal Vscan1
For low potential, the second scanning signal Vscan2 is low potential, and the second pole of first capacitor C1 keeps the first number of first stage t1
It is believed that the current potential of number Vdata1, the second pole of the second capacitor C2 keeps the electricity of the second data-signal Vdata2 of first stage t1
Position；First switch transistor TS1 responds the low potential of the first scanning signal Vscan1 and turns off, and second switch transistor TS2 is rung
It answers the low potential of the second scanning signal Vscan2 and turns off, the first light emitting control transistor TS3 responds LED control signal Vemit
High potential and be connected, first driving transistor TD1 response the second pole of first capacitor C1 high potential and be connected, second drive
Transistor TD2 responds the high potential of the second pole of the second capacitor C2 and is connected；First driving transistor TD1 and the second driving crystal
The second switch transistor TS2 driving light emitting diode D that drives current through of pipe TD2 generation shines, to realize display panel
Display function.
It should be noted that schematically illustrating the first driving transistor TD1, the second driving in the above embodiments
Transistor TD2, first switch transistor TS1, second switch transistor TS2 and the first light emitting control transistor TS3 are N-type crystalline substance
Body pipe, not limitation of the invention.In other embodiments, the first driving transistor TD1, the second driving crystalline substance can also be set
Body pipe TD2, first switch transistor TS1, second switch transistor TS2 and the first light emitting control transistor TS3 are P-type crystal
Pipe, alternatively, portion of transistor is P-type transistor, portion of transistor is N-type transistor, be can according to need in practical applications
It is set.
Fig. 5 is the structural schematic diagram of another pixel circuit provided in an embodiment of the present invention.Referring to Fig. 5, optionally, pixel
Circuit further includes first threshold compensating module 21 and second threshold compensating module 22, and first threshold compensating module 21 is for compensating the
The threshold voltage of one driving transistor TD1, second threshold compensating module 22 are used to compensate the threshold value electricity of the second driving transistor TD2
Pressure.The embodiment of the present invention is in this way, can be by the driving current of the first driving transistor TD1 and the second driving transistor TD2
Compensation is the parameter not comprising threshold voltage, therefore, driving current can be made not driven by the first driving transistor TD1 and second
The influence of the threshold voltage of dynamic transistor TD2 is avoided because of the unbalanced bring display unevenness of the threshold voltage of driving transistor
Phenomenon, wherein driving the unbalanced reason of the threshold voltage of transistor is, for example, process variations or the aging for driving transistor.
With continued reference to Fig. 4, optionally, first threshold compensating module 21 includes the switch of the 4th switching transistor TS4 and the 5th
Transistor TS5；Second threshold compensating module 22 includes the 6th switching transistor TS6 and the 7th switching transistor TS7.First driving
The first pole of transistor TD1 is electrically connected with the first power supply signal input VDD, the second pole and the of the first driving transistor TD1
The first pole electrical connection of two driving transistor TD2, the second pole of the second driving transistor TD2 and the first pole of light emitting diode D
Coupling；The first pole of first switch transistor TS1 is electrically connected with the first data signal end Data1, first switch transistor TS1's
Second pole is electrically connected with the first pole of the first driving transistor TD1, the grid and the first scanning signal of first switch transistor TS1
Hold Scan1 electrical connection；The first pole of second switch transistor TS2 is electrically connected with the second data signal end Data2, and second switch is brilliant
The second pole of body pipe TS2 is electrically connected with the first pole of the second driving transistor TD2, the grid of second switch transistor TS2 and the
Scan signal end Scan1 electrical connection；The first pole of 4th switching transistor TS4 is electrically connected with the first reference voltage end Ref1,
The second pole of 4th switching transistor TS4 is electrically connected with the grid of the first driving transistor TD1, the 4th switching transistor TS4's
Grid is electrically connected with third scanning signal end Scan3；The first pole of 5th switching transistor TS5 and the first driving transistor TD1
Grid electrical connection, the second pole of the 5th switching transistor TS5 with first drive transistor TD1 the second pole be electrically connected, the 5th
The grid of switching transistor TS5 is electrically connected with the first scanning signal end Scan1；The first pole of 6th switching transistor TS6 and the
Two reference voltage end Ref2 electrical connection, the second pole of the 6th switching transistor TS6 and the grid of the second driving transistor TD2 are electrically connected
It connects, the grid of the 6th switching transistor TS6 is electrically connected with third scanning signal end Scan3；The first of 7th switching transistor TS7
Pole is electrically connected with the grid of the second driving transistor TD2, the second pole of the 7th switching transistor TS7 and the second driving transistor
The second pole of TD2 is electrically connected, and the grid of the 7th switching transistor TS7 is electrically connected with the first scanning signal end Scan1.
With continued reference to Fig. 5, optionally, pixel circuit further includes the second light emitting control transistor TS8 and third light emitting control
Transistor TS9.Second light emitting control transistor TS8 is connected in series in the first power supply signal end and first and drives transistor TD1's
Between first pole, whether to control the first power supply signal by the turn-on and turn-off for controlling the second light emitting control transistor TS8
The grid of the first driving of input transistor TD1.Third light emitting control transistor TS9 is connected in series in the first driving transistor TD1
The second pole and second driving transistor TD2 the first pole between, with by control third light emitting control transistor TS9 conducting
The grid whether the first power supply signal inputs the second driving transistor TD2 is controlled with shutdown.
It should be noted that it is brilliant to schematically illustrate the first light emitting control transistor TS3, the second light emitting control in Fig. 5
The grid of body pipe TS8 and the grid of third light emitting control transistor TS9 are electrically connected with light emitting control end Emit, not to this hair
Bright restriction.In other embodiments, the first light emitting control transistor TS3, the second light emitting control transistor TS8 can also be set
Grid and the grid of third light emitting control transistor TS9 be separately connected different light emitting control ends, in practical applications can be with
It is set as needed.
With continued reference to Fig. 5, optionally, scanning circuit further includes the tenth switching transistor TS10, the tenth switching transistor
The first pole of TS10 is electrically connected with third reference voltage end Ref3, the second pole of the tenth switching transistor TS10 and light emitting diode
The first pole of D is electrically connected, and the grid of the tenth switching transistor TS10 is electrically connected with third scanning signal end Scan3, the tenth switch
Transistor TS10 for being initialized to the first pole of light emitting diode D, to avoid light emitting diode D the first pole by upper one
The influence of frame further improves the accuracy to light emitting diode D control.
Fig. 6 is the driver' s timing schematic diagram of another pixel circuit provided in an embodiment of the present invention.Referring to figs. 5 and 6, show
Example property, the first driving transistor TD1, the second driving transistor TD2, the first switch transistor switching transistor of TS1~the 7th
TS7, the first light emitting control transistor TS3, the second light emitting control transistor TS8 and third light emitting control transistor TS9 are N-type
Transistor, the first supply voltage Vdd of the first power supply signal input VDD input are high potential, second source signal input part
The second source voltage Vee of VEE input is low potential, and the first reference voltage Vref 1 of the first reference voltage end Ref1 input is
High potential, the second reference voltage Vref 2 of the second reference voltage end Ref2 are high potential, the third of third reference voltage end Ref3
Reference voltage Vref 3 is low potential.The driving method of the pixel circuit includes: phase III t3, fourth stage t4 and the 5th rank
Section t5.
Phase III t3, also referred to as initial phase, LED control signal Vemit are low potential, the first scanning signal
Vscan1 is low potential, and third scanning signal Vscan3 is high potential.First light emitting control transistor TS3, the second light emitting control
Transistor TS8 and third light emitting control transistor TS9 in response to LED control signal Vemit low potential and turn off.First switch
Transistor TS1, the first scanning of second switch transistor TS2, the 5th switching transistor TS5 and the 7th switching transistor TS7 response
The low potential of signal Vscan1 and turn off.4th switching transistor TS4 in response to third scanning signal Vscan3 high potential and lead
Logical, the first reference voltage of the first reference voltage end Ref1 is brilliant by the first driving of the 4th switching transistor TS4 write-in of conducting
The grid of body pipe TD1 and the second pole of first capacitor C1, with the of grid and first capacitor C1 to the first driving transistor TD1
The voltage of two poles is initialized, and guarantees that next stage first drives transistor TD1 conducting, the first data-signal Vdata1 can
The grid of the first driving of write-in transistor TD1.6th switching transistor TS6 in response to third scanning signal Vscan3 high potential and
Conducting, the second driving of the 6th switching transistor TS6 write-in that the second reference voltage of the second reference voltage end Ref2 passes through conducting
Second pole of the grid of transistor TD2 and the second capacitor C2, with the grid and the second capacitor C2 to the second driving transistor TD2
The voltage of second pole is initialized, and guarantees that next stage second drives transistor TD2 conducting, the second data-signal Vdata2 energy
Enough grids of the second driving of write-in transistor TD2.Tenth switching transistor TS10 responds the height electricity of third scanning signal Vscan3
Position and be connected, the third reference voltage of third reference voltage end Ref3 is luminous by the tenth switching transistor TS10 write-in of conducting
The first pole of diode D is initialized with the voltage of the first pole to light emitting diode D.
Fourth stage t4, also referred to as data write phase, LED control signal Vemit are low potential, the first scanning signal
Vscan1 is high potential, and third scanning signal Vscan3 is low potential.First light emitting control transistor TS3, the second light emitting control
Transistor TS8 and third light emitting control transistor TS9 in response to LED control signal Vemit low potential and turn off.4th switch
The low potential of transistor TS4, the 6th switching transistor TS6 and the tenth switching transistor TS10 response third scanning signal Vscan3
And it turns off.First switch transistor TS1 and the 5th switching transistor TS5 responds the high potential of the first scanning signal Vscan1 and leads
Logical, the high potential of the first data-signal Vdata1 passes sequentially through first switch transistor TS1, the first driving transistor TD1 and the
The grid of the first driving of five switching transistor TS5 write-in transistor TD1 and the second pole of first capacitor C1, the first driving transistor
The grid voltage of TD1 gradually rises, until the grid voltage of the first driving transistor TD1 and its first pole tension difference are equal to first
When driving the threshold voltage of transistor TD1, the first driving transistor TD1 cut-off, the grid voltage of the first driving transistor TD1 is protected
Hold constant, the grid voltage Vg1=Vdata1- of the first driving transistor TD1 | Vth1 |.Second switch transistor TS2 and the 7th
Switching transistor TS7 responds the high potential of the first scanning signal Vscan1 and is connected, the high potential of the second data-signal Vdata2
Pass sequentially through second switch transistor TS2, second driving transistor TD2 and the 7th switching transistor TS7 write-in the second driving crystalline substance
The grid voltage of second pole of the grid of body pipe TD2 and the second capacitor C2, the second driving transistor TD2 gradually rises, until the
When the grid voltage of two driving transistor TD2 and the first pole tension difference are equal to the threshold voltage of the second driving transistor TD2, second
Transistor TD2 cut-off is driven, the grid voltage of the second driving transistor TD2 remains unchanged, the grid of the second driving transistor TD2
Voltage Vg2=Vdata2- | Vth2 |.
5th stage t5, also referred to as light emitting phase, LED control signal Vemit are high potential, the first scanning signal Vscan1
For low potential, third scanning signal Vscan3 is low potential.First switch transistor TS1, second switch transistor TS2, the 5th
Switching transistor TS5 and the 7th switching transistor TS7 responds the low potential of the first scanning signal Vscan1 and turns off, the 4th switch
The low potential of transistor TS4, the 6th switching transistor TS6 and the tenth switching transistor TS10 response third scanning signal Vscan3
And it turns off.First light emitting control transistor TS3, the second light emitting control transistor TS8 and third light emitting control transistor TS9 response
The high potential of LED control signal Vemit and be connected.The voltage of the first pole of first driving transistor TD1 is Vdd, the first driving
The first pole transistor TD1 and grid voltage difference Vsg=Vdd-Vg1=Vdd-Vdata1+ | Vth1 |, the first driving transistor TD1
The driving current Id of generation meets following formula:
Id=ak1 (Vsg1- | Vth1 |)2=ak1 (Vdd-Vdata1+ | Vth1 |-| Vth1 |)2=ak1 (Vdd-
Vdata1)2
It can thus be seen that the threshold for the driving of the driving current Id and first transistor TD1 that the first driving transistor TD1 is generated
Threshold voltage is unrelated, to realize the threshold voltage compensation to the first driving transistor TD1.Similarly, the second driving transistor
The driving current Id that TD2 is generated is unrelated with the second driving threshold voltage of transistor TD2, to realize to the second driving crystal
The threshold voltage compensation of pipe TD2.The driving current that first driving transistor TD1 and the second driving transistor TD2 are generated successively is led to
Cross the first light emitting control transistor TS3, the first driving transistor TD1, the second light emitting control transistor TS8, the second driving crystal
Pipe TD2 and third light emitting control transistor TS9 driving light emitting diode D shines, to realize the display function of display panel.
On the basis of the various embodiments described above, optionally, light emitting diode D is micro- light emitting diode D, to promote micro- shine
Image hierarchy sense of the diode D display panel in low ash rank extends the brightness range of micro- light emitting diode D, promotes micro- shine
The display image quality of diode D display panel.
The embodiment of the invention also provides a kind of driving method of pixel circuit, the driving method of the pixel circuit can be applied
In pixel circuit such as provided by any embodiment of the invention.Fig. 7 is a kind of drive of pixel circuit provided in an embodiment of the present invention
The flow diagram of dynamic method.Referring to Fig. 7, the driving method the following steps are included:
S110, the first data-signal of gate transport for driving transistor to first are passed to the grid of the second driving transistor
Pass through identical driving current in defeated second data-signal, the first driving transistor and the second driving transistor.
S120, driving current drive lumination of light emitting diode.
Wherein, the first driving transistor and the second driving transistor are different to the degree of regulation of driving current respectively.
The embodiment of the present invention is by passing through identical driving electricity in the first driving transistor of setting and the second driving transistor
Stream and the first driving transistor and the second driving transistor are different to the degree of regulation of driving current respectively, realize first
Driving transistor and the second driving transistor cooperation are modulated driving current.Wherein, driving transistor can be with
Main modulation is carried out to driving current, another driving transistor can be finely adjusted system to driving current, be advantageously implemented to drive
The finer modulation of streaming current.Compared with prior art, the embodiment of the present invention improves figure of the display panel in low ash rank
As stereovision, the brightness range of light emitting diode is extended, the display image quality of display panel is improved.
On the basis of the various embodiments described above, optionally, the first data-signal includes the m preset value increased one by one, phase
Voltage difference between adjacent two preset values is V1；Second data-signal includes the n preset value increased one by one, two neighboring pre-
If the voltage difference between value is V2；Wherein, V1 < V2, m > n, m and n are positive integer.The embodiment of the present invention be arranged V1 < V2 and
M > n, i.e., the second driving transistor carry out main modulation to driving current, and the first driving transistor is finely adjusted system to driving current,
It is advantageously implemented the modulation finer to driving current.
On the basis of the various embodiments described above, optionally, first switch transistor is used in the enabled of the first scanning signal
By the first data signal transmission to the grid of the first driving transistor under the control of signal；Second switch transistor is used for second
By the second data signal transmission to the grid of the second driving transistor under the control of the enable signal of scanning signal；Wherein, first
Scanning signal is identical as the second scanning signal, so that first switch transistor and second switch transistor are simultaneously turned on and closed
Disconnected, the first data-signal and the second data-signal write-in first simultaneously can drive the grid of transistor and the second driving brilliant respectively
The grid of body pipe enables the first driving transistor and the second driving transistor to simultaneously turn on, generates driving current, have ensured that
Lumination of light emitting diode.
The embodiment of the invention also provides a kind of display panels.Fig. 8 is a kind of display panel provided in an embodiment of the present invention
Structural schematic diagram.Referring to Fig. 8, illustratively, display panel can be micro- LED display panel or organic light emission two
Pole pipe display panel.The display panel includes pixel circuit 1 provided by any embodiment of the invention, technical principle and generation
Technical effect it is similar, which is not described herein again.
With continued reference to Fig. 8, optionally, display panel further include the first scan line 2, the second scan line 3, the first data line 4,
Second data line 5, grid electrode drive module 6 and source drive module 7.Grid electrode drive module 5 passes through the first scan line 2 and the respectively
First scanning signal and the second scanning signal are transmitted to pixel circuit 1 by two scan lines 3, and source drive module 7 is respectively by the
One data line 4 and the second data line 5 are by the first data-signal and the second data signal transmission to pixel circuit, and display panel is according to this
Realize display function.
The embodiment of the invention also provides a kind of display devices.Fig. 9 is a kind of display device provided in an embodiment of the present invention
Structural schematic diagram.Referring to Fig. 9, which includes display panel 100 provided by any embodiment of the invention, technology
Principle is similar with the technical effect of generation, and which is not described herein again.The display device for example can be mobile phone, computer, tablet computer,
The electronic equipments such as wearable device and Vehicular display device.
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 (14)
1. a kind of pixel circuit, which is characterized in that including the first driving transistor, the second driving transistor, first switch crystal
Pipe, second switch transistor and light emitting diode；
The first driving transistor and the second driving transistor series connection, and the first driving transistor and described second
Driving strings of transistors is coupled between the first power supply signal input and the first pole of the light emitting diode；
The first switch transistor is used for the first data signal transmission under the control of the enable signal of the first scanning signal
To the grid of the first driving transistor；
The second switch transistor is used for the second data signal transmission under the control of the enable signal of the second scanning signal
To the grid of the second driving transistor；Second pole of the light emitting diode is electrically connected with second source signal input part；
The channel width-over-length ratio of the first driving transistor is a, and the channel width-over-length ratio of the second driving transistor is b, wherein
a/b≥2。
2. pixel circuit according to claim 1, which is characterized in that
The range of a/b is 5~30.
3. pixel circuit according to claim 1, which is characterized in that
First pole of the first driving transistor is electrically connected with first power supply signal input, the first driving crystal
Second pole of pipe with it is described second driving transistor the first pole be electrically connected, it is described second drive transistor the second pole with it is described
First pole of light emitting diode couples；
First pole of the first switch transistor is electrically connected with the first data signal end, and the second of the first switch transistor
Pole is electrically connected with the grid of the first driving transistor, and the grid of the first switch transistor is electrically connected with the first scanning signal end
It connects；
First pole of the second switch transistor is electrically connected with the second data signal end, and the second of the second switch transistor
Pole is electrically connected with the grid of the second driving transistor, and the grid of the second switch transistor is electrically connected with the second scanning signal end
It connects.
4. pixel circuit according to claim 1, which is characterized in that
The voltage of first data-signal is D1, and the voltage of second data-signal is D2, wherein D1 > D2.
5. pixel circuit according to claim 1, which is characterized in that further include:
First capacitor and the second capacitor；
The first capacitor is used to keep the current potential of the grid of the first driving transistor；
Second capacitor is used to keep the current potential of the grid of the second driving transistor.
6. pixel circuit according to claim 5, which is characterized in that
The capacitance of the first capacitor is C1, and the capacitance of second capacitor is C2, wherein C1 > C2.
7. pixel circuit according to claim 1, which is characterized in that
The light emitting diode is micro- light emitting diode.
8. pixel circuit according to claim 1, which is characterized in that further include:
First light emitting control transistor, for controlling the first pole of first power supply signal input Yu the light emitting diode
Between driving current path conducting and shutdown.
9. pixel circuit according to claim 1, which is characterized in that further include:
First threshold compensating module, for compensating the threshold voltage of the first driving transistor；
Second threshold compensating module, for compensating the threshold voltage of the second driving transistor.
10. a kind of driving method of pixel circuit, which is characterized in that be applied to such as the described in any item pixels of claim 1-9
Circuit；
The driving method includes:
To the first data-signal of gate transport of the first driving transistor, to the second data of gate transport of the second driving transistor
Pass through identical driving current in signal, the first driving transistor and the second driving transistor；
The driving current drives lumination of light emitting diode；
Wherein, it is described first driving transistor and it is described second driving transistor respectively to the degree of regulation of the driving current not
Together.
11. driving method according to claim 10, which is characterized in that
First data-signal includes the m preset value increased one by one, and the voltage difference between two neighboring preset value is V1；
Second data-signal includes the n preset value increased one by one, and the voltage difference between two neighboring preset value is V2；
Wherein, V1 < V2, m > n, m and n are positive integer.
12. driving method according to claim 10, which is characterized in that
First switch transistor is used for the first data signal transmission to institute under the control of the enable signal of the first scanning signal
State the grid of the first driving transistor；
Second switch transistor is used for the second data signal transmission to institute under the control of the enable signal of the second scanning signal
State the grid of the second driving transistor；
Wherein, first scanning signal is identical as second scanning signal.
13. a kind of display panel, which is characterized in that including multiple such as the described in any item pixel circuits of claim 1-9.
14. a kind of display device, which is characterized in that including the display panel described in claim 13.
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| WO2023245432A1 (en) * | 2022-06-21 | 2023-12-28 | 京东方科技集团股份有限公司 | Pixel circuit and driving method therefor, display substrate, and display device |
| US12315430B2 (en) | 2022-06-21 | 2025-05-27 | Boe Technology Group Co., Ltd. | Pixel circuit, drive method therefor, display substrate, and display device |
| CN115497429A (en) * | 2022-09-29 | 2022-12-20 | 上海天马微电子有限公司 | Pixel driving circuit, module, backlight source, panel, device and driving method |
| CN115497429B (en) * | 2022-09-29 | 2023-12-01 | 上海天马微电子有限公司 | Pixel driving circuit, module, backlight source, panel, device and driving method |
| CN115547258A (en) * | 2022-10-31 | 2022-12-30 | 武汉天马微电子有限公司 | Display panel, driving method thereof and display device |
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