CN110021265A - A kind of pixel circuit and its driving method, display device and driving method - Google Patents

A kind of pixel circuit and its driving method, display device and driving method Download PDF

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Publication number
CN110021265A
CN110021265A CN201910346149.8A CN201910346149A CN110021265A CN 110021265 A CN110021265 A CN 110021265A CN 201910346149 A CN201910346149 A CN 201910346149A CN 110021265 A CN110021265 A CN 110021265A
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data voltage
module
data
grayscale
grid
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CN110021265B (en
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符鞠建
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Shanghai Tianma Microelectronics Co Ltd
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Shanghai Tianma Microelectronics Co Ltd
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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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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Control Of El Displays (AREA)

Abstract

The present invention discloses a kind of pixel circuit and driving method, display device and driving method, pixel circuit includes the first data voltage writing module, the second data voltage writing module, the first memory module, the second memory module, driving transistor and the first light emitting module, and driving transistor is double-gated transistor；Transistor is driven to be used to drive the first light emitting module to shine according to the first data voltage and the second data voltage；The display grayscale of first data voltage and pixel corresponds, and within the scope of the first preset gray scale, the second data voltage is used to improve the driving current of driving transistor；First preset gray scale range is more than or equal to 0 grayscale and to be less than or equal to 128 grayscale.The embodiment of the present invention, to the display grayscale within the scope of the first preset gray scale, when fixed with one-to-one first data voltage of each display grayscale, the driving current that driving transistor under each grayscale can be improved by adjusting the second data voltage, improves the first light emitting module in the light emission luminance of low gray-scale areas.

Description

A kind of pixel circuit and its driving method, display device and driving method
Technical field
The present embodiments relate to field of display technology more particularly to a kind of pixel circuits and driving method, display device And driving method.
Background technique
With the development of display technology, Micro LED is as display technology of new generation, because it is with brighter than existing OLED Du Genggao, luminous efficiency are more preferable, the lower advantage of power consumption, have been more and more widely used.
Micro LED is current drive-type luminescent device, and driving method includes active drive and passive matrix, according to The mode of active drive can then be driven using existing conventional pixel circuit.
However, in low gray-scale areas, existing to pixel electricity when being driven using normal pixel circuit to Micro LED When data voltage corresponding with a certain grayscale being written in road, the light emission luminance of Micro LED is not achieved corresponding with the grayscale bright Degree, the problem for causing low gray-scale areas display device overall brightness relatively low.
Summary of the invention
The present invention provides a kind of pixel circuit and driving method, display device and driving method, improves display dress to realize Set the display brightness in low gray-scale areas.
In a first aspect, the embodiment of the invention provides a kind of pixel circuit, including the first data voltage writing module, second Data voltage writing module, the first memory module, the second memory module, driving transistor and the first light emitting module, drive crystal Pipe is the double-gated transistor for including first grid and second grid；
First data voltage writing module is used to that the first data voltage to be written to first grid；
Second data voltage writing module is used to that the second data voltage to be written to second grid；
First memory module is used to store the voltage of first grid；
Second memory module is used to store the voltage of second grid；
Transistor is driven to be used to drive the first light emitting module to shine according to the first data voltage and the second data voltage；Its In, the display grayscale of the first data voltage and pixel corresponds, and within the scope of the first preset gray scale, the second data voltage is used for Improve the driving current of driving transistor；Wherein, the first preset gray scale range is more than or equal to 0 grayscale and to be less than or equal to 128 grayscale.
Second aspect, the embodiment of the invention also provides a kind of driving methods of pixel circuit, for driving first aspect The pixel circuit of offer, pixel circuit include the first data voltage writing module, the second data voltage writing module, the first storage Module, the second memory module, driving transistor and the first light emitting module, driving transistor be include first grid and second grid Double-gated transistor；
Driving method includes:
Data write phase, controls the first data voltage writing module and the second data voltage writing module is connected, and first First grid is written by the first data voltage writing module of conducting in data voltage, and the second data voltage passes through the second of conducting Second grid is written in data voltage writing module, wherein the display grayscale of the first data voltage and pixel corresponds, first Within the scope of preset gray scale, the second data voltage is used to improve the driving current of driving transistor；Wherein, the first preset gray scale range For more than or equal to 0 grayscale and less than or equal to 128 grayscale；
Light emitting phase, driving transistor drive the first light emitting module hair according to the first data voltage and the second data voltage Light.
The third aspect, the embodiment of the invention also provides a kind of display device, including display panel and with display panel electricity The driving chip of connection, display panel include the pixel circuit of first aspect offer as the first pixel circuit, the first pixel electricity Road is defeated including the first data voltage input terminal, the second data voltage input terminal, the first scanning signal input terminal, the second scanning signal Enter end, first voltage signal input part and second voltage input terminal；First data voltage input terminal and the first data voltage are written The input terminal of module is electrically connected, and the first scanning signal input terminal is electrically connected with the control terminal of the first data voltage writing module, the The output end of one data voltage writing module is electrically connected with the first grid of driving transistor；Second data voltage input terminal and The input terminal of two data voltage writing modules is electrically connected, the control of the second scanning signal input terminal and the second data voltage writing module The output end of end electrical connection processed, the second data voltage writing module is electrically connected with the second grid of driving transistor；
Display device further include:
The multiple data lines being electrically connected are corresponded with multiple output ends of driving chip, the first data voltage input terminal is logical It crosses corresponding data line to be electrically connected with driving chip, the second data voltage input terminal passes through corresponding data line and drive Dynamic chip electrical connection；
Scan drive circuit and the multi-strip scanning line being electrically connected with multiple output ends of scan drive circuit one-to-one correspondence, the Scan signal input terminal is electrically connected by corresponding scan line with scan drive circuit, and the second scanning signal input terminal is logical Corresponding scan line is crossed to be electrically connected with scan drive circuit.
Fourth aspect, the embodiment of the invention also provides a kind of driving methods of display device, for driving the third aspect The display device of offer, driving method include:
In data write phase, the first data voltage writing module and the conducting of the second data voltage writing module, the first number First grid is written according to voltage, second grid is written in the second data voltage, wherein the display grayscale of the first data voltage and pixel It corresponds, within the scope of the first preset gray scale, the second data voltage is used to improve the driving current of driving transistor；Wherein, First preset gray scale range is more than or equal to 0 grayscale and to be less than or equal to 128 grayscale；
Light emitting phase, driving transistor shine according to the first data voltage and the second data voltage driving light emitting module.
Pixel circuit and its driving method provided in an embodiment of the present invention, display device and its driving method, pass through setting Driving transistor in pixel circuit is double-gated transistor, and driving transistor drives according to the first data voltage and the second data voltage Dynamic first light emitting module shines；The display grayscale of first data voltage and pixel corresponds, for the first preset gray scale range Interior each display grayscale can be by adjusting the second number when fixed with one-to-one first data voltage of each display grayscale The driving current for driving transistor under each grayscale is improved according to voltage, and then improves the first light emitting module shining in low gray-scale areas Brightness can improve Micro LED relatively low phenomenon of light emission luminance in low gray-scale areas, improve display effect.
Detailed description of the invention
Fig. 1 is that the luminous efficiency of Micro LED red, green, blue sub-pixel provided in an embodiment of the present invention and current density are closed It is curve graph；
Fig. 2 is a kind of structural schematic diagram of pixel circuit provided in an embodiment of the present invention；
Fig. 3 is the second grid voltage of driving transistor provided in an embodiment of the present invention and the threshold voltage of driving transistor Relational graph；
Fig. 4 is the relational graph of driving transistor gate source voltage difference and driving current 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 structural schematic diagram of another pixel circuit provided in an embodiment of the present invention；
Fig. 7 is a kind of working timing figure of pixel circuit provided in an embodiment of the present invention；
Fig. 8 is another working timing figure of pixel circuit provided in an embodiment of the present invention；
Fig. 9 is another working timing figure of pixel circuit provided in an embodiment of the present invention；
Figure 10 is a kind of flow chart of the driving method of pixel circuit provided in an embodiment of the present invention；
Figure 11 is a kind of structural schematic diagram of display device provided in an embodiment of the present invention；
Figure 12 is the structural schematic diagram of another display device provided in an embodiment of the present invention；
Figure 13 is the structural schematic diagram of another display device provided in an embodiment of the present invention；
Figure 14 is the structural schematic diagram of another display device provided in an embodiment of the present invention；
Figure 15 is the structural schematic diagram of another display device provided in an embodiment of the present invention；
Figure 16 is the structural schematic diagram of the second pixel circuit 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 the background art, aobvious in display panel when being driven using normal pixel circuit to Micro LED Show the region of low ash rank, hereinafter referred to as low gray-scale areas is (specifically a certain to be greater than or equal to 0 grayscale and be less than or equal to 32 grayscale Gray-scale areas, in other words, display panel display brightness be greater than or equal to 0 grayscale and be less than or equal to 32 grayscale pixel institute Region), have that when data voltage corresponding with a certain grayscale being written into pixel circuit, the reality of Micro LED is luminous Brightness corresponding with the grayscale is not achieved in brightness, leads to the target more corresponding than the grayscale of the existing display brightness under identical voltage The relatively low problem of display brightness, it should be noted that low gray-scale areas does not imply that the somewhere or certain block region of display panel, and When referring to that display panel is shown, in display panel when included any pixel light emission corresponding grayscale value between 0 grayscale To certain pixel between 32 grayscale, such as in display panel, at a time corresponding display grayscale is 16 grayscale, then the pixel The low gray-scale areas of grayscale shown by the pixel is in the display grayscale (16 grayscale) at the moment.In other words, low ash rank area Domain is in grayscale reference axis, and grayscale value is 0 grayscale to the display area of 32 grayscale.
In normal pixel circuit, driving Micro LED luminous driving transistor is usually single gate transistor, drives crystal The data voltage of tube grid write-in determines that the size of driving current, the size of driving current affect the luminance of Micro LED Degree.In the display device of the prior art, storage and the one-to-one data voltage of each grayscale usually in driving chip, When Micro LED will show some grayscale, number corresponding with the grayscale is exported to the grid of driving transistor by driving chip According to voltage.However, through inventor the study found that the light emission luminance of Micro LED not only with the driving current that flows through Micro LED Correlation is also related to the luminous efficiency of Micro LED.Fig. 1 is Micro LED red, green, blue picture provided in an embodiment of the present invention The luminous efficiency and current density graph of relation of element, wherein current density is the driving electricity for flowing through luminescent device in sub-pixel The current density of stream,；With reference to Fig. 1, illustratively, the corresponding current density of low gray-scale areas 510 be 0-0.01, current density with Grayscale shown by pixel is corresponding, and with the increase of current density, the grayscale that pixel is shown is gradually increased.With reference to Fig. 1, in low ash The luminous efficiency of rank region Micro LED red, green, blue sub-pixel is integrally relatively low, causes even if driving transistor gate write-in When data voltage reaches data voltage corresponding with grayscale to be shown, the existing display brightness of luminescent device cannot still reach with It shows the corresponding target display brightness of grayscale, it is relatively low in low ash rank region entirety brightness to eventually lead to display device.It needs Bright, existing display brightness is the shown light emission luminance of Micro LED when a certain voltage is written in low gray-scale areas, Existing display brightness is related to driving current, while also related with the luminous efficiency of Micro LED；And target display brightness be The low gray-scale areas does not consider the luminance for the Micro LED that the luminous efficiency of Micro LED influences in above-mentioned identical voltage Degree.
Based on the above issues, the embodiment of the present invention provides a kind of pixel circuit, and Fig. 2 is one kind provided in an embodiment of the present invention The structural schematic diagram of pixel circuit, with reference to Fig. 2, which includes the first data voltage writing module 110, the second data electricity Writing module 120, the first memory module 130, the second memory module 140, driving transistor DT and the first light emitting module 150 are pressed, Driving transistor DT is the double-gated transistor for including first grid G1 and second grid G2；Fig. 2 is to drive transistor DT as p-type crystalline substance Body pipe is to exemplify；
First data voltage writing module 110 is used to that the first data voltage to be written to first grid G1；
Second data voltage writing module 120 is used to that the second data voltage to be written to second grid G2；
First memory module 130 is used to store the voltage of first grid G1；
Second memory module 140 is used to store the voltage of second grid G2；
Transistor DT is driven to be used to drive the first light emitting module 150 hair according to the first data voltage and the second data voltage Light；Wherein, the display grayscale of the first data voltage and pixel corresponds, within the scope of the first preset gray scale, the second data electricity Pressure is for improving the driving current of driving transistor DT；Wherein, the first preset gray scale range is more than or equal to 0 grayscale and to be less than Or it is equal to 128 grayscale.
It wherein, may include multiple display grayscale within the scope of the first preset gray scale, the first preset gray scale range can be in advance A grey-scale range being stored in driving chip, the driving chip are the display dress for including pixel circuit provided in this embodiment Driving chip in setting, as described above, the first preset gray scale range are more than or equal to 0 grayscale and to be less than or equal to 128 ashes Rank.When because driving using normal pixel circuit to Micro LED, (specifically it is greater than or equal to 0 grayscale in low gray-scale areas And it is less than or equal to the gray-scale areas of 32 grayscale), when there is the write-in data voltage corresponding with a certain grayscale into pixel circuit, Brightness corresponding with the grayscale is not achieved in the light emission luminance of Micro LED, leads to the existing display brightness ratio under identical voltage The relatively low problem of the corresponding target display brightness of the grayscale.Therefore the first preset gray scale range be chosen as be greater than or equal to 0 grayscale and Less than or equal to 32 grayscale, so that in the range of being greater than or equal to 0 grayscale and being less than or equal to 32 grayscale, the second data voltage For improving the driving current of driving transistor DT, so that in low gray-scale areas, the actual displayed brightness of Micro LED can be with Reach target display brightness corresponding with grayscale.It should be noted that the actual displayed brightness of Micro LED is to consider Micro The luminous efficiency of LED is to the display brightness after being improved compensation after the influence of display brightness.
Wherein, light emitting module can be Micro LED.Specifically, driving transistor DT is double-gated transistor, according to driving Electric current calculation formulaWherein, Cox is gate oxidation Layer capacitance (capacitor on gate oxide unit area), μ is carrier mobility,For drive transistor DT breadth length ratio, VGS is voltage difference between driving transistor DT grid and source electrode, and VG is to drive the grid voltage of transistor DT (in the present embodiment For the voltage of the first grid G1 of driving transistor DT), VS is the source voltage for driving transistor, and Vth is driving transistor DT Threshold voltage, it is known that driving current and drive transistor DT threshold voltage, driving transistor DT grid and source electrode between Voltage difference is related.Wherein, it drives the source electrode of transistor DT to commonly enter fixed voltage, therefore drives electric current and the drive of transistor DT The threshold voltage of dynamic transistor DT and the grid voltage correlation for driving transistor DT.
In the embodiment of the present invention, driving transistor DT is double-gated transistor, wherein the first grid of write driver transistor DT The first data voltage of pole G1 is equivalent to the grid voltage of the driving transistor DT in electric current calculation formula, drives transistor DT Threshold voltage to driving the second grid G2 voltage swing of transistor DT it is related.Fig. 3 is driving provided in an embodiment of the present invention The second grid voltage of transistor and the threshold voltage relational graph of driving transistor.The corresponding driving transistor DT of Fig. 3 is P-type crystal The case where pipe, by adjusting second grid G2 voltage, i.e., by adjusting the second data voltage, can achieve adjusting and drives with reference to Fig. 3 The purpose of the threshold voltage of dynamic transistor DT.Fig. 4 is driving transistor gate source voltage difference provided in an embodiment of the present invention and driving The relational graph of electric current, curve 10 and curve 20 respectively correspond the current curve of two different threshold voltages in Fig. 4, with reference to Fig. 4, when Corresponding identical gate source voltage is poor (because source voltage is usually fixed value, that is, to correspond to identical first grid G1 voltage namely right Answer identical first data voltage), such as the Vgs1 in Fig. 4, the electric current of the driving transistor DT of different threshold voltages are different 's.By as above analyzing, it is known that driving transistor DT by setting is double-gated transistor, is written to second grid G2 by adjusting The second data voltage, can reach the threshold voltage for adjusting driving transistor DT, and then be written to the first of first grid G1 When data voltage is fixed, driving current is further adjusted.For shining in low gray-scale areas for Micro LED in the prior art The lower problem for causing existing display brightness lower of efficiency, can be specific by being written to the second grid G2 of driving transistor DT Second data voltage improves driving current, and then improves the display brightness in low gray-scale areas of Micro LED.
In the embodiment of the present invention, the first preset gray scale range is up to 0-128 grayscale, so that low gray-scale areas necessarily includes Within the scope of the first preset gray scale.Within the scope of the first preset gray scale, by be written first grid G1 the first data voltage and The second data voltage of write-in second grid G2 carrys out the size of the driving current of co- controlling driving transistor DT, and passes through second Data voltage drives the driving current of transistor DT to improve, and luminance of the Micro LED in low gray-scale areas can be improved Degree improves display effect.
Also, the voltage by changing second grid G2 drives the threshold voltage of transistor to adjust, can be with different ladders Degree changes to Micro LED drive current.Existing display device includes driving chip, and driving chip includes data voltage output End, data voltage output end are electrically connected with to the of pixel circuit with the first data voltage writing module 110 in pixel circuit One Data write. module 110 provides data voltage, and the precision of each data voltage output end output data voltage is certain, example Such as, the data voltage output end output accuracy of driving chip is 0.1V, then when being shown, data voltage writing module 110 The first data voltage being written to driving transistor DT first grid G1 can be increasedd or decreased with the gradient of 0.1V, corresponding driving electricity Stream calculation formulaIn, VG is increased with the gradient of 0.1V It adds deduct small, correspondingly, the change gradient of driving current is 0.01A.But the first data voltage changing value is that 0.1V may be right Answer different grayscale.Therefore, for a certain fixed gray level, in the case where the first data voltage is fixed, by being driven according in Fig. 3 The second grid voltage of dynamic transistor DT and the threshold voltage relationship of driving transistor adjust the second number of write-in second grid G2 According to voltage, driving current is further adjusted by the threshold voltage that the second data voltage adjusts transistor, threshold voltage follows the Two data voltages change, since the variation range of the second data voltage is greater than the variable range of the threshold voltage of transistor, according to Variable gradient of the variable gradient less than the second data voltage of threshold voltage value can be obtained in corresponding relationship in Fig. 3, further Ground driving current follows threshold voltage to change, and reduces the gradient of the change of driving current, realizes the small gradient of driving current and becomes Change, for example, driving current is corresponding when the second data voltage adjusting drive transistor threshold voltage is increasedd or decreased with 0.01V Changing gradient is 0.0001A.So that driving current can be with smaller gradient to drive under conditions of guaranteeing that display grayscale is constant Streaming current is adjusted, and to increased or decrease display brightness, compensates influence of the low gray-scale areas to pixel light emission efficiency；In other words It says and is exactly, through this embodiment, can make driving voltage that driving current be adjusted, while not having to change driving voltage ladder In the case where degree, the gradient of the change of driving current is reduced, realizes the variation of the small gradient of driving current；To make pixel i.e. Make to maintain under same grayscale, can also correspond to and obtain different driving currents, thus adjusting essence without improving driving voltage In the case where degree, change driving current by a small margin is realized, to change the pixel display brightness under fixed display grayscale to reach Object brightness.Such as original 32 grayscale can only correspond to the first data voltage of 1.0V, adjust to 0.9V when the first data voltage or When 1.1V, corresponding grayscale is no longer 32 grayscale, and since Micro LED is lower in the luminous efficiency of low gray-scale areas, 1.0V The first data voltage will cause Micro LED existing display brightness it is lower.Setting driving transistor DT is double-gated transistor Afterwards, the second data voltage of second grid G2 can be written to by adjusting, such as according to the second data voltage and driving transistor The relationship of the threshold voltage of DT can make the threshold voltage for driving transistor DT with 0.01V's by adjusting the second data voltage Gradient change, then by the second data voltage of control write-in second grid G2, according to the first data voltage and the second data electricity Pressure the first light emitting module 150 of common driving shines, and the driving current within the scope of the first preset gray scale can be made to increase, to improve Display brightness under the display grayscale, compensate for due in low gray-scale areas since luminous efficiency deficiency causes existing display Brightness is inadequate, to guarantee that actual displayed brightness reaches the target display brightness under the display grayscale, improves Micro LED in low ash The relatively low phenomenon of light emission luminance in rank region improves display effect.
It should be noted that Vdd input voltage is higher than Vss input voltage in Fig. 2.The corresponding driving transistor of Fig. 2 is that p-type is brilliant Body pipe, first voltage input terminal is Vdd at this time.Driving transistor DT is also possible to N-type transistor, when driving transistor is N-type When transistor, Vss is first voltage signal input part, the both ends of the first memory module 130 and the second memory module 140 respectively with Drive first grid G1 and the Vss electrical connection of transistor DT.
Pixel circuit provided in an embodiment of the present invention is double grid crystal by the driving transistor in setting pixel circuit Pipe, driving transistor drive the first light emitting module to shine according to the first data voltage and the second data voltage；First data voltage Corresponded with the display grayscale of pixel, for each display grayscale within the scope of the first preset gray scale, with each display grayscale When one-to-one first data voltage is fixed, the drive of driving transistor under each grayscale can be improved by adjusting the second data voltage Streaming current, and then the first light emitting module is improved in the light emission luminance of low gray-scale areas, Micro LED can be improved in low ash rank area The relatively low phenomenon of light emission luminance in domain improves display effect.It refers to guaranteeing to be somebody's turn to do it should be noted that improving light emission luminance In the immovable situation of display grayscale in region, by the second data voltage, further adjusting for small gradient drives transistor Driving current, to improve display effect, the display brightness for compensating low gray-scale areas is insufficient.
Above in core of the invention thought, the attached drawing in conjunction with the embodiments is continued with, in the embodiment of the present invention Technical solution is clearly and completely described, it is clear that and the described embodiments are only a part of the embodiments of the utility model, Instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative labor Under the premise of dynamic, every other embodiment obtained be shall fall within the protection scope of the present invention.
With continued reference to Fig. 2, on the basis of above scheme, optionally, the first data voltage writing module 110 includes input End, output end and control terminal, the input terminal of the first data voltage writing module 110 and the first data voltage of pixel circuit input Vdata1 electrical connection is held, the first grid G1 of the output end and driving transistor DT of the first data voltage writing module 110 is electrically connected It connects, the control terminal of the first data voltage writing module 110 is electrically connected with the first scanning signal input terminal Scan1 of pixel circuit；
Second data voltage writing module 120 includes input, output end and control terminal, the second data voltage writing module 120 input terminal is electrically connected with the second data voltage input terminal Vdata2 of pixel circuit, the second data voltage writing module 120 Output end with driving transistor DT second grid G2 be electrically connected, the control terminal and picture of the second data voltage writing module 120 Second scanning signal input terminal Scan2 of plain circuit is electrically connected；
The first pole of driving transistor DT is electrically connected with the first voltage signal input part Vdd of pixel circuit, drives crystal The second pole of pipe DT is electrically connected with the first end of the first light emitting module 150, the second end and pixel circuit of the first light emitting module 150 Second voltage signal input part Vss electrical connection；
The both ends of first memory module 130 are electrically connected with first grid G1 and first voltage signal input part Vdd respectively；
The both ends of second memory module 140 are electrically connected with second grid G2 and first voltage signal input part Vdd respectively.
Specifically, working sequence can be divided into data write phase and light emitting phase when above-mentioned pixel circuit works.? Data write phase, the first data voltage writing module 110 and the conducting of the second data voltage writing module 120, the first data electricity First grid G1 is written by the first data voltage writing module 110 of conducting in pressure, and the second data voltage passes through the second of conducting Data voltage writing module 120 is written second grid G2, and the first memory module 130 and the second memory module 140 can be respectively to the One data voltage and the second data voltage are stored.In light emitting phase, drive transistor DT according to the first data voltage and the Two data voltages drive the first light emitting module 150 to shine.
Pixel circuit provided in an embodiment of the present invention is double grid crystal by the driving transistor in setting pixel circuit Pipe, driving transistor drive the first light emitting module to shine according to the first data voltage and the second data voltage；First data voltage Corresponded with the display grayscale of pixel, for each display grayscale within the scope of the first preset gray scale, with each display grayscale When one-to-one first data voltage is fixed, the drive of driving transistor under each grayscale can be improved by adjusting the second data voltage Streaming current, and then the first light emitting module is improved in the light emission luminance of low gray-scale areas, Micro LED can be improved in low ash rank area The relatively low phenomenon of light emission luminance in domain improves display effect.
Fig. 5 is the structural schematic diagram of another pixel circuit provided in an embodiment of the present invention, and with reference to Fig. 5, pixel circuit is also Including light emitting control module 160, the control terminal N of light emitting control module 160 is for inputting LED control signal, light emitting control module 160 first end is electrically connected with the second pole of driving transistor DT, the second end of light emitting control module 160 and the first light emitting module 150 first end electrical connection.
Specifically, in data write phase, light emitting control module 160 turns off, and rank is written in data when the pixel circuit works Light emitting phase after section, light emitting control module 160 are connected, and then guarantee only in 150 ability of the first light emitting module of light emitting phase It can shine, when the first data voltage write-in first grid G1 and/or the second data voltage write-in second grid G2 being avoided not to complete The luminous bring of the mistake of first light emitting module 150 shows bad.
Fig. 6 is the structural schematic diagram of another pixel circuit provided in an embodiment of the present invention, with reference to Fig. 6, the first data electricity Pressing writing module 110 includes the first transistor T1, and the second data voltage writing module 120 includes second transistor T2, and first deposits Storing up module 130 includes first capacitor C1, and the second memory module 140 includes the second capacitor C2, and light emitting control module 160 includes at least Third transistor T3；
Control terminal of the grid of the first transistor T1 as the first data voltage writing module 110, the first transistor T1's Input terminal of first pole as the first data voltage writing module 110, the second pole of the first transistor T1 is as the first data electricity Press the output end of writing module 110；
Control terminal of the grid of second transistor T2 as the second data voltage writing module 120, second transistor T2's Input terminal of first pole as the second data voltage writing module 120, the second pole of second transistor T2 is as the second data electricity Press the output end of writing module 120；
Make first pole of control terminal of the grid of third transistor T3 as light emitting control module 160, third transistor T3 For the first end of light emitting control module 160, second end of the second pole of third transistor T3 as light emitting control module 160；
Two pole plates at both ends of two pole plates of first capacitor C1 as the first memory module 130, the second capacitor C2 are made For the both ends of the second memory module 140.
Wherein, the first light emitting module 150 can be Micro LED component D1.The working sequence of above-mentioned pixel circuit can be with Including data write phase and light emitting phase.Below with the first transistor T1, second transistor T2, third transistor T3 and driving Transistor DT is to be illustrated for P-type transistor, and Vdd is as first voltage signal input part at this time, the two of first capacitor C1 End is electrically connected with the first grid G1 and first voltage signal input part Vdd of driving transistor DT respectively, and the two of the second capacitor C2 End is electrically connected with the first grid G2 and first voltage signal input part Vdd of driving transistor DT respectively.
In data write phase, the first scanning signal input terminal Scan1 and the second scanning signal input terminal Scan2 input are low Level signal, the control terminal input high level signal of third transistor T3, the first transistor T1 and second transistor T2 conducting, the Three transistor T3 shutdown, the first data voltage and the second data voltage pass through the first transistor T1 and the second crystal of conducting respectively Pipe T2 is written to the first grid G1 and second grid G2 of driving transistor DT.
In light emitting phase, the first scanning signal input terminal Scan1 and the second scanning signal input terminal Scan2 input high level Signal, the control terminal input low level signal of third transistor T3, the first transistor T1 and second transistor T2 shutdown, third are brilliant Body pipe T3 conducting, the driving current that driving transistor DT is generated drive the first light emitting module 150 to shine.
Fig. 7 is a kind of working timing figure of pixel circuit provided in an embodiment of the present invention, which can 7 institute of corresponding diagram The pixel circuit shown, with reference to Fig. 6 and Fig. 7, data write phase t1, the first scanning signal input terminal Scan1 and the second scanning letter Input low level signal, the first transistor T1 and second transistor T2 are simultaneously turned on simultaneously by number input terminal Scan2, the first data electricity Pressure is written to first grid G1 and is written to second grid G2 with the second data voltage to be carried out simultaneously.
High electricity is inputted in light emitting phase t2, the first scanning signal input terminal Scan1 and the second scanning signal input terminal Scan2 Ordinary mail number, the control terminal input low level signal of third transistor T3, the first transistor T1 and second transistor T2 shutdown, third Transistor T3 conducting, the driving current that driving transistor DT is generated drive the first light emitting module 150 to shine.
Cause the first scanning signal input terminal Scan1 and the second scanning signal input terminal Scan2 while input low level signal, So when the first scanning signal input terminal Scan1 and the second scanning signal input terminal Scan2 can be connect with same scan line, it is right For whole display device, the quantity of scan line not will increase, be conducive to be routed.
Pixel circuit provided in an embodiment of the present invention is double grid crystal by the driving transistor in setting pixel circuit Pipe, driving transistor drive the first light emitting module to shine according to the first data voltage and the second data voltage；First data voltage Corresponded with the display grayscale of pixel, for each display grayscale within the scope of the first preset gray scale, with each display grayscale When one-to-one first data voltage is fixed, the drive of driving transistor under each grayscale can be improved by adjusting the second data voltage Streaming current carries out the adjusting of small gradient to the driving current of driving transistor and then improves the first light emitting module in low gray-scale areas Light emission luminance, can improve Micro LED relatively low phenomenon of light emission luminance in low gray-scale areas, improve display effect.
Fig. 8 is another working timing figure of pixel circuit provided in an embodiment of the present invention, which can corresponding diagram 8 Shown in pixel circuit, with reference to Fig. 6 and Fig. 8, data write phase t1 includes first stage t11 and second stage t12, first Stage t11, the first scanning signal input terminal Scan1 input low level signal, the first transistor T1 conducting, the first data voltage are write Enter the first grid G1 to driving transistor DT；Second scanning signal input terminal Scan2 input high level signal, second transistor T2 shutdown；
In second stage t12, the first scanning signal input terminal Scan1 input high level signal, the first transistor T1 shutdown； Second gate is written in second scanning signal input terminal Scan2 input low level signal, second transistor T2 conducting, the second data voltage Pole G2.
High electricity is inputted in light emitting phase t2, the first scanning signal input terminal Scan1 and the second scanning signal input terminal Scan2 Ordinary mail number, the control terminal input low level signal of third transistor T3, the first transistor T1 and second transistor T2 shutdown, third Transistor T3 conducting, the driving current that driving transistor DT is generated drive the first light emitting module 150 to shine.
Fig. 9 is another working timing figure of pixel circuit provided in an embodiment of the present invention, which can corresponding diagram 5 Shown in pixel circuit, with reference to Fig. 6 and Fig. 9, t11 in the first stage, the first scanning signal input terminal Scan1 input high level letter Number, the first transistor T1 shutdown；Second scanning signal input terminal Scan2 input low level signal, second transistor T2 conducting, the Second grid G2 is written in two data voltages；
In second stage t12, the first scanning signal input terminal Scan1 input low level signal, the first transistor T1 is connected, First data voltage is written to the first grid G1 of driving transistor DT；Second scanning signal input terminal Scan2 input high level Signal, second transistor T2 shutdown.
High electricity is inputted in light emitting phase t2, the first scanning signal input terminal Scan1 and the second scanning signal input terminal Scan2 Ordinary mail number, the control terminal input low level signal of third transistor T3, the first transistor T1 and second transistor T2 shutdown, third Transistor T3 conducting, the driving current that driving transistor DT is generated drive the first light emitting module 150 to shine.
The working sequence of Fig. 8 and pixel circuit shown in Fig. 9, the first transistor T1 and second transistor T2 are not led simultaneously It is logical, the independent control to the first transistor T1 and second transistor T2 may be implemented.
The embodiment of the invention also provides a kind of driving method of pixel circuit, which can be used for driving the present invention The pixel circuit that above-mentioned any embodiment provides, Figure 10 is a kind of driving method of pixel circuit provided in an embodiment of the present invention Flow chart, wherein pixel circuit includes the first data voltage writing module, the second data voltage writing module, the first storage mould Block, the second memory module, driving transistor and the first light emitting module, driving transistor be include first grid and second grid Double-gated transistor；With reference to Figure 10, the driving method of the pixel circuit includes:
Step 210, data write phase, control the first data voltage writing module and the second data voltage writing module is led Logical, first grid is written by the first data voltage writing module of conducting in the first data voltage, and the second data voltage is by leading Second grid is written in the second logical data voltage writing module, wherein the display grayscale one of the first data voltage and pixel is a pair of It answers, within the scope of the first preset gray scale, the second data voltage is used to improve the driving current of driving transistor；Wherein, first is pre- If grey-scale range is more than or equal to 0 grayscale and to be less than or equal to 128 grayscale；
Step 220, light emitting phase, driving transistor shine according to the first data voltage and the second data voltage driving first Module shines.
The driving method of pixel circuit provided in an embodiment of the present invention, by controlling the first data in data write phase Voltage writing module and the conducting of the second data voltage writing module, the first data voltage write-in that the first data voltage passes through conducting First grid is written in module, and second grid is written by the second data voltage writing module of conducting in the second data voltage, wherein The display grayscale of first data voltage and pixel corresponds, and within the scope of the first preset gray scale, the second data voltage is for mentioning The driving current of height driving transistor；Wherein, the first preset gray scale range is more than or equal to 0 grayscale and to be less than or equal to 128 Grayscale so that for each display grayscale within the scope of the first preset gray scale, with each display grayscale one-to-one When one data voltage is fixed, the driving current of driving transistor under each grayscale can be improved by adjusting the second data voltage, in turn The first light emitting module is improved in the light emission luminance of low gray-scale areas, Micro LED luminance in low gray-scale areas can be improved Relatively low phenomenon is spent, display effect is improved.
On the basis of above scheme, optionally, pixel circuit further includes light emitting control module, the control of light emitting control module End processed is electrically connected with the second pole of driving transistor, shines for inputting LED control signal, the first end of light emitting control module The second end of control module is electrically connected with the first end of the first light emitting module；The driving method of pixel circuit includes:
In data write phase, the shutdown of light emitting control module is controlled；
In light emitting phase, the conducting of light emitting control module is controlled.
By controlling the shutdown of light emitting control module in data write phase；In light emitting phase, controls light emitting control module and lead It is logical, it is ensured that only can just shine in the first light emitting module of light emitting phase, avoid the first data voltage write-in first grid and/ Or second data voltage write-in second grid do not complete when the first light emitting module mistake shine bring show it is bad.
On the basis of above scheme, optionally, in step 210, data write phase, the first data voltage writing module It being connected with the second data voltage writing module, first grid is written in the first data voltage, and second grid is written in the second data voltage, Include:
Step 211, data write phase, the first Data write. module and the second Data write. module simultaneously turn on, and first First grid and second grid is written in data voltage and the second data voltage simultaneously.
Because the first Data write. module and the second Data write. module simultaneously turn on, so when the first scanning signal input terminal It can be connect with same scan line with the second scanning signal input terminal, for whole display device, not will increase scan line Quantity, be conducive to be routed.
The driving method of pixel circuit provided in an embodiment of the present invention, by controlling the first data in data write phase Voltage writing module and the conducting of the second data voltage writing module, the first data voltage write-in that the first data voltage passes through conducting First grid is written in module, and second grid is written by the second data voltage writing module of conducting in the second data voltage, wherein The display grayscale of first data voltage and pixel corresponds, and within the scope of the first preset gray scale, the second data voltage is for mentioning The driving current of height driving transistor；Wherein, the first preset gray scale range is more than or equal to 0 grayscale and to be less than or equal to 128 Grayscale so that for each display grayscale within the scope of the first preset gray scale, with each display grayscale one-to-one When one data voltage is fixed, the driving current of driving transistor under each grayscale can be improved by adjusting the second data voltage, in turn The first light emitting module is improved in the light emission luminance of low gray-scale areas, Micro LED luminance in low gray-scale areas can be improved Relatively low phenomenon is spent, display effect is improved.
On the basis of above scheme, optionally, in step 210, data write phase includes first stage and second-order First grid is written in section, the first data voltage writing module and the conducting of the second data voltage writing module, the first data voltage, the Second grid is written in two data voltages, comprising:
Step 212, in the first stage, the conducting of the first Data write. module, the shutdown of the second Data write. module, the first data First grid is written in voltage；
Step 213, in second stage, the conducting of the second Data write. module, the shutdown of the first Data write. module, the second data Second grid is written in voltage；
Or include:
Step 214, first stage, the conducting of the second Data write. module, the shutdown of the first Data write. module, the second data electricity Pressure write-in second grid；
Step 215, in second stage, the conducting of the first Data write. module, the shutdown of the second Data write. module, the first data First grid is written in voltage.
On the basis of above scheme, optionally, the grey-scale range of pixel includes that the first preset gray scale range and second are pre- If grey-scale range, within the scope of the second preset gray scale, the second data voltage is definite value；Wherein, within the scope of the second preset gray scale Minimum gray scale is higher than the highest grayscale within the scope of the first preset gray scale.
Specifically, because luminous efficiency of the Micro LED only in low ash order range is poor, therefore, in the first default ash In order range, i.e., in the range of maximum magnitude is 0-128 grayscale, the threshold value of driving transistor is adjusted by the second data voltage Voltage, and then the driving current of driving transistor is improved, to increase the actual displayed brightness in low ash order range.Also, Within the scope of the first preset gray scale, the second data voltage can be different under each grayscale.Second preset gray scale range can correspond to phase To higher grey-scale range, such as when the first preset gray scale range is 0-128 grayscale, the second preset gray scale range be can be 129-255 grayscale, within the scope of the second preset gray scale, there is no the problems of Micro LED luminous efficiency difference, therefore pass through basis First data voltage drives the first light emitting module to shine.Therefore, within the scope of the second preset gray scale, the second data voltage is Definite value, i.e., it is identical for corresponding second data voltage of each grayscale within the scope of the second preset gray scale, i.e., it is pre- second If in grey-scale range, being not required to adjust the threshold voltage of driving transistor by the second data voltage, the first light emitting module can be made Reach expected brightness.
The embodiment of the invention also provides a kind of display device, Figure 11 is a kind of display device provided in an embodiment of the present invention Structural schematic diagram, which includes display panel 310 and the driving chip being electrically connected with display panel 310 320, reference Figure 11, display panel 310 include multiple sub-pixels 330, include the sub-pixel 330 of array arrangement with display panel 310 in Figure 11 It is illustrated, display panel 310 includes the pixel circuit of above-mentioned any embodiment offer as the first pixel circuit, wherein the One pixel circuit can refer to Fig. 2, and the first pixel circuit includes the first data voltage input terminal Vdata1, the input of the second data voltage Hold Vdata2, the first scanning signal input terminal Scan1, the second scanning signal input terminal Scan2, first voltage signal input part Vdd and second voltage input terminal Vss；First data voltage input terminal Vdata1 is defeated with the first data voltage writing module 110 Entering end electrical connection, the first scanning signal input terminal Scan1 is electrically connected with the control terminal of the first data voltage writing module 110, the The output end of one data voltage writing module 110 is electrically connected with the first grid G1 of driving transistor DT；Second data voltage is defeated Enter to hold Vdata2 and the input terminal of the second data voltage writing module 120 to be electrically connected, the second scanning signal input terminal Scan2 and The control terminal of two data voltage writing modules 120 is electrically connected, the output end and driving crystal of the second data voltage writing module 120 The second grid G2 of pipe DT is electrically connected；It is inputted and the second data voltage in Figure 11 with the first data voltage in the first pixel circuit Input terminal Vdata2 connects different data lines, the first scanning signal input terminal Scan1 and the second scanning signal input terminal Scan2 It connects and is illustrated for different scan lines；
Display device further include:
The multiple data lines (D1, D2, D3 ...) being electrically connected are corresponded with multiple output ends of driving chip 320, the One data voltage input terminal Vdata1 is electrically connected by corresponding data line with driving chip 320, and the second data voltage is defeated Enter to hold Vdata2 to be electrically connected by corresponding data line with driving chip 320；
What scan drive circuit 340 and corresponding with multiple output ends of scan drive circuit 340 was electrically connected a plurality of sweeps It retouches line (S1, S2, S3 ...), the first scanning signal input terminal Scan1 passes through corresponding scan line and scan drive circuit 340 electrical connections, the second scanning signal input terminal Scan2 are electrically connected by corresponding scan line with scan drive circuit 340.
It should be noted that only schematically illustrating the first pixel circuit to drive a sub-pixel in Figure 11 The first data voltage input terminal Vdata1, the second data voltage input terminal Vdata2, the first scanning signal input terminal Scan1, For second scanning signal input terminal Scan2, to drive the first data voltage of the first pixel circuit of other sub-pixels defeated Enter to hold Vdata1, the second data voltage input terminal Vdata2, the first scanning signal input terminal Scan1, the input of the second scanning signal Hold Scan2 similar with structure shown by the sub-pixel.Specifically, the pixel circuit in the display device is at work, work Data write phase and light emitting phase can be divided by making timing.In data write phase, scan drive circuit 340 controls line by line The first data voltage writing module and the conducting of second voltage Data write. module in each first pixel circuit, driving chip 320 Believe by column to the first data voltage input terminal Vdata1 of each column pixel and the second data voltage input terminal Vdata2 input data Number, the first data voltage write driver transistor first grid, the second data voltage write driver transistor second grid, In, the display grayscale of the first data voltage and pixel corresponds, and within the scope of the first preset gray scale, the second data voltage is used for Improve the driving current of driving transistor.
Light emitting phase, driving transistor shine according to the first data voltage and the second data voltage driving light emitting module.
Display device provided in an embodiment of the present invention, the driving transistor in pixel circuit by the way that display device is arranged are Double-gated transistor, driving transistor drive the first light emitting module to shine according to the first data voltage and the second data voltage；First The display grayscale of data voltage and pixel corresponds, for each display grayscale within the scope of the first preset gray scale, with it is each It, can be brilliant by adjusting driving under each grayscale of the second data voltage raising when showing that one-to-one first data voltage of grayscale is fixed The driving current of body pipe, and then the first light emitting module is improved in the light emission luminance of low gray-scale areas, Micro LED can be improved and existed The relatively low phenomenon of light emission luminance in low gray-scale areas improves display effect.
1 is continued to refer to figure 1, optionally, the first data voltage input terminal Vdata1 and the second data voltage input terminal Vdata2 is electrically connected with different data line.Specifically, each data line is electrically connected with each output end of driving chip 320 respectively, For a specific output end of driving chip 320, the gradient of output voltage is certain, the first data voltage of setting Input terminal and the second data voltage input terminal are connect with different data line, can make the first data voltage and the second data voltage Regulating gradient it is different, be more conducive to the control to driver transistor drives current in pixel circuit.
Figure 12 is the structural schematic diagram of another display device provided in an embodiment of the present invention, with reference to Figure 12, optionally, the One data voltage input terminal Vdata1 and the second data voltage input terminal Vdata2 are electrically connected with same data line, so that aobvious The data line quantity of showing device not will increase, and is improving Micro LED relatively low phenomenon of light emission luminance in low ash order range, is mentioning While high display effect, reduce wiring difficulty.
It should be noted that only schematically illustrating the first pixel circuit to drive a sub-pixel in Figure 12 The first data voltage input terminal Vdata1, the second data voltage input terminal Vdata2, the first scanning signal input terminal Scan1, Second scanning signal input terminal Scan2, to drive the first data voltage input terminal Vdata1, the second data of other sub-pixels Voltage input end Vdata2, the first scanning signal input terminal Scan1, the second scanning signal input terminal Scan2 each input terminal with Structure shown by the sub-pixel is similar.
It should be noted that the first scanning signal input terminal Scan1 and the second scanning signal input terminal Scan2 can also be with phases Same scan line connection or different scan line connections, in data write phase, the first data voltage of control is written first The timing of grid and the second data voltage write-in second grid.In Figure 10 and Figure 11, the first scanning signal input terminal Scan1 and Two scanning signal input terminal Scan2 are connected from different scan lines, and then can successively control the first number in data write phase According to the write-in of voltage and the second data voltage.Figure 13 is the structural representation of another display device provided in an embodiment of the present invention Figure, Figure 14 is the structural schematic diagram of another display device provided in an embodiment of the present invention, with reference to Figure 13 and Figure 14, the first scanning Signal input part Scan1 and the second scanning signal input terminal Scan2 can be connect with identical scan line, can control the first number at this time It is written simultaneously according to voltage and the second data voltage.
Figure 15 is the structural schematic diagram of another display device provided in an embodiment of the present invention, on the basis of above scheme On, optionally, display panel 310 further includes the second pixel circuit, and Figure 16 is the second pixel circuit provided in an embodiment of the present invention Structural schematic diagram, with reference to Figure 15 and Figure 16, the second pixel circuit include third data voltage input terminal Vdata3, third scanning Signal input part Scan3, tertiary voltage signal input part Vdd1, the 4th voltage signal inputs Vss1, third data voltage are write Enter module 410, drive module 420, third memory module 430 and the second light emitting module 440；
The control terminal of third data voltage writing module 410 is electrically connected with third scanning signal input terminal Scan3, third number It is electrically connected according to the first end of voltage writing module 410 with third data voltage input terminal Vdata3, mould is written in third data voltage The second end of block 410 is electrically connected with the control terminal of drive module 420；
The first end of drive module 420 is electrically connected with tertiary voltage signal input part Vdd1, the second end of drive module 420 It is electrically connected with the first end of the second light emitting module 440, the second end and the 4th voltage signal inputs of the second light emitting module 440 Vss1 electrical connection；
The first end of third memory module 430 is electrically connected with the control terminal of drive module 420, third memory module 430 Second end is electrically connected with the first end of drive module 420；
Third data voltage input terminal Vdata3 is electrically connected by corresponding data line with driving chip 320；Third Scanning signal input terminal Scan3 is electrically connected by corresponding scan line with scan drive circuit 340.
Specifically, Micro LED pixel generally includes red, green, blue sub-pixel.It continues to refer to figure 1, in low gray-scale areas 510, the luminous efficiency of red sub-pixel is minimum, the luminous efficiency highest of green sub-pixels, and the luminous efficiency of blue subpixels occupies In between the two.Therefore, the sub-pixel relatively high in low gray-scale areas luminous efficiency, such as green sub-pixels can be adopted It is driven with the second pixel circuit, for the sub-pixel relatively low in low gray-scale areas luminous efficiency, such as red son Pixel and blue subpixels can be driven using the first pixel circuit, to improve it in the driving current of low gray-scale areas, be mentioned The brightness of height display.Figure 15 is shown red sub-pixel column 11 and blue subpixel column 12 and is driven using the first pixel-driving circuit It is dynamic, the case where green sub-pixels column 13 are driven using the second pixel circuit.For using the sub-pixel of the second pixel circuit driving, Its third scanning signal input terminal Scan3 can be inputted with the first scanning signal of the sub-pixel using the driving of the first pixel circuit Hold the identical scan line of Scan1 connection；For the sub-pixel using the driving of the second pixel circuit, third data voltage input terminal Vdata3 can connect identical with the first data voltage input terminal Vdata1 of the sub-pixel using the driving of the first pixel circuit Data line.
On the basis of above scheme, optionally, the first light emitting module includes at least emitting red light module, the second luminous mould Block 440 includes at least green emitting module.
Wherein, the first light emitting module and the second light emitting module can be Micro LED, emitting red light module and green emitting Module can be red and green Micro LED sub-pixel respectively.Such as above-mentioned analysis, in low gray-scale areas luminous efficiency Relatively high sub-pixel, such as green sub-pixels and blue subpixels can be driven using the second pixel circuit, right It can be driven using the first pixel circuit in the sub-pixel relatively low in low gray-scale areas luminous efficiency, such as red sub-pixel It is dynamic, to improve it in the driving current of low gray-scale areas, improve the brightness of display.Also, because of the device in the second pixel circuit It is all less with signal input port, include the second pixel circuit by setting display panel, the wiring of display panel can be reduced Difficulty.
The embodiment of the invention also provides a kind of driving methods of display device, provide for above-mentioned any embodiment aobvious Showing device, driving method include:
In data write phase, the first data voltage writing module and the conducting of the second data voltage writing module, the first number First grid is written according to voltage, second grid is written in the second data voltage, wherein the display grayscale of the first data voltage and pixel It corresponds, within the scope of the first preset gray scale, the second data voltage is used to improve the driving current of driving transistor；Wherein, First preset gray scale range is more than or equal to 0 grayscale and to be less than or equal to 128 grayscale；
Light emitting phase, driving transistor shine according to the first data voltage and the second data voltage driving light emitting module.
The driving method of display device provided in an embodiment of the present invention, by controlling the first data in data write phase Voltage writing module and the conducting of the second data voltage writing module, the first data voltage write-in that the first data voltage passes through conducting First grid is written in module, and second grid is written by the second data voltage writing module of conducting in the second data voltage, wherein The display grayscale of first data voltage and pixel corresponds, and within the scope of the first preset gray scale, the second data voltage is for mentioning The driving current of height driving transistor；Wherein, the first preset gray scale range is more than or equal to 0 grayscale and to be less than or equal to 128 Grayscale so that for each display grayscale within the scope of the first preset gray scale, with each display grayscale one-to-one When one data voltage is fixed, the driving current of driving transistor under each grayscale can be improved by adjusting the second data voltage, in turn The first light emitting module is improved in the light emission luminance of low gray-scale areas, Micro LED luminance in low gray-scale areas can be improved Relatively low phenomenon is spent, display effect is improved.
On the basis of above scheme, optionally, before data write phase, further includes:
Grayscale test is carried out to display device using grayscale acquisition device, grayscale acquisition device is electrically connected with driving chip, With corresponding first data voltage of each grayscale of determination and the second data voltage.
Specifically, needing before display device factory by corresponding first data voltage of each grayscale and the second data electricity Pressure is written in driving chip, to guarantee to show according to the display device each in picture when using display device The grayscale of pixel determines corresponding first data voltage and the second data voltage, guarantees the good display effect of display device.
On the basis of above scheme, optionally, grayscale test is carried out to display device using grayscale acquisition device, with true Determine corresponding first data voltage of each grayscale and the second data voltage, comprising:
Scan drive circuit inputs scanning signal, control the first data electricity to the first scanning signal input terminal by scan line Writing module conducting is pressed, driving chip passes through data according to preset the first data voltage range corresponding with pre-display grayscale Line and the first data voltage writing module of conducting provide the first data voltage to the first grid of driving transistor；
Scan drive circuit inputs scanning signal, control the second data electricity to the second scanning signal input terminal by scan line Writing module conducting is pressed, according to preset the second data voltage range corresponding with pre-display grayscale, passes through data line and conducting The second data voltage writing module to driving transistor second grid provide the second data voltage；
The grayscale and pre-display grayscale for the display picture that driving chip is got according to grayscale acquisition device are with fixed ladder Degree adjustment the first data voltage and/or the second data voltage, until the grayscale for the display picture that grayscale acquisition device is got with When pre-display grayscale is identical, it is corresponding that corresponding first data voltage of the grayscale and the second data voltage are determined as pre-display grayscale The first data voltage and the second data voltage be stored in driving chip.
Wherein, pre-display grayscale can be display device i.e. for the ash of display corresponding to sub-pixel each in picture to be shown Rank.Based on practical experience, usually corresponding first data voltage range of each grayscale and the second data voltage range.In determination It, can be in the first data voltage range and the second data voltage when corresponding first data voltage of each grayscale and the second data voltage The first data voltage and the second data voltage are adjusted with fixed gradient in range, and display is obtained by grayscale acquisition device in real time The grayscale of device.
Optionally, when carrying out grayscale test to display panel using grayscale acquisition device, the aobvious of whole display device can be made Show Display panel same gray level so that testing simpler convenience.Such as to the first data voltage corresponding to determining 32 grayscale When with the second data voltage, it is assumed that the first data voltage range of value is 1.0V-1.3V, the second data voltage model based on practical experience Enclosing can be first by controlling the first data voltage writing module and the second data when then carrying out grayscale test for 0.01V-0.09V 1.0V and 0.01V, are respectively written into the first grid and second grid of driving transistor by the conducting of voltage writing module, and are used Whether the grayscale and pre-display grayscale of grayscale acquisition device acquisition actual displayed are identical, can be first successively with 0.01V if not identical Gradient increase the second data voltage, if increase to maximum second data voltage 0.09V, cannot still reach pre-display ash Rank then can increase by the first data voltage with the gradient of 0.1V, such as adjust the first data voltage to 1.1V, and on the basis of 1.1V On the second data voltage is adjusted in an identical manner, until grayscale acquisition device gets display device actual displayed When grayscale is identical as pre-display grayscale, by this time the first data voltage and the second data voltage be determined as 32 grayscale corresponding One data voltage and the second data voltage.Test for other grayscale, process is identical, and details are not described herein.
The driving method of display device provided in an embodiment of the present invention carries out ash to display device by grayscale acquisition device Rank test, and then the first data voltage corresponding with each grayscale and the second data voltage are obtained, so that each grayscale is corresponding The first data voltage and the storage of the second data voltage to after driving chip, display device can be determined according to the grayscale of pre-display Fixed the first data voltage and the second data voltage, driving transistor drive according to the first data voltage and the second data voltage First light emitting module shines；Wherein, the display grayscale of the first data voltage and pixel corresponds, within the scope of preset gray scale, The driving current of driving transistor can be improved by adjusting the second data voltage, and then improves the first light emitting module in low ash rank area The light emission luminance in domain can improve Micro LED relatively low phenomenon of light emission luminance in low ash order range, improve display effect.
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 (17)

1. a kind of pixel circuit, which is characterized in that including the first data voltage writing module, the second data voltage writing module, First memory module, the second memory module, driving transistor and the first light emitting module, the driving transistor be include the first grid The double-gated transistor of pole and second grid；
The first data voltage writing module is used to that the first data voltage to be written to the first grid；
The second data voltage writing module is used to that the second data voltage to be written to the second grid；
First memory module is used to store the voltage of the first grid；
Second memory module is used to store the voltage of the second grid；
The driving transistor is used to be shone according to first data voltage and second data voltage driving described first Module shines；Wherein, the display grayscale of first data voltage and pixel corresponds, within the scope of the first preset gray scale, Second data voltage is used to improve the driving current of the driving transistor；Wherein, the first preset gray scale range is More than or equal to 0 grayscale and it is less than or equal to 128 grayscale.
2. pixel circuit according to claim 1, which is characterized in that the first data voltage writing module includes input End, output end and control terminal, the input terminal of the first data voltage writing module and the first data electricity of the pixel circuit Input terminal electrical connection is pressed, the output end of the first data voltage writing module and the first grid of the driving transistor are electrically connected It connects, the control terminal of the first data voltage writing module is electrically connected with the first scanning signal input terminal of the pixel circuit；
The second data voltage writing module includes input, output end and control terminal, and mould is written in second data voltage The input terminal of block is electrically connected with the second data voltage input terminal of the pixel circuit, the second data voltage writing module Output end with it is described driving transistor second grid be electrically connected, the control terminal of the second data voltage writing module with it is described Second scanning signal input terminal of pixel circuit is electrically connected；
First pole of the driving transistor is electrically connected with the first voltage signal input part of the pixel circuit, and the driving is brilliant Second pole of body pipe is electrically connected with the first end of first light emitting module, the second end of first light emitting module and the picture The second voltage signal input part of plain circuit is electrically connected；
The both ends of first memory module are electrically connected with the first grid and the first voltage signal input part respectively；
The both ends of second memory module are electrically connected with the second grid and the first voltage signal input part respectively.
3. pixel circuit according to claim 2, which is characterized in that further include light emitting control module, the light emitting control The control terminal of module is for inputting LED control signal, and the of the first end of the light emitting control module and the driving transistor The electrical connection of two poles, the second end of the light emitting control module are electrically connected with the first end of first light emitting module.
4. pixel circuit according to claim 3, which is characterized in that the first data voltage writing module includes first Transistor, the second data voltage writing module includes second transistor, and first memory module includes first capacitor, institute Stating the second memory module includes the second capacitor, and the light emitting control module includes at least third transistor；
Control terminal of the grid of the first transistor as the first data voltage writing module, the first transistor Input terminal of first pole as the first data voltage writing module, the second pole of the first transistor is as first data The output end of voltage writing module；
Control terminal of the grid of the second transistor as the second data voltage writing module, the second transistor Input terminal of first pole as the second data voltage writing module, the second pole of the second transistor is as described second The output end of data voltage writing module；
Make first pole of control terminal of the grid of the third transistor as the light emitting control module, the third transistor For the first end of the light emitting control module, the second pole of the third transistor as the light emitting control module second End；
Two pole plates at both ends of two pole plates of the first capacitor as first memory module, second capacitor are made For the both ends of the second memory module.
5. a kind of driving method of pixel circuit, which is characterized in that the pixel circuit include the first data voltage writing module, Second data voltage writing module, the first memory module, the second memory module, driving transistor and the first light emitting module, it is described Driving transistor is the double-gated transistor for including first grid and second grid；
The driving method includes:
Data write phase controls the first data voltage writing module and the conducting of the second data voltage writing module, the first data The first grid is written by the first data voltage writing module of conducting in voltage, and the second data voltage passes through the second of conducting The second grid is written in data voltage writing module, wherein the display grayscale one of first data voltage and pixel is a pair of It answers, within the scope of the first preset gray scale, second data voltage is used to improve the driving current of the driving transistor；Its In, the first preset gray scale range is more than or equal to 0 grayscale and to be less than or equal to 128 grayscale；
Light emitting phase, the driving transistor is according to first data voltage and second data voltage driving described first Light emitting module shines.
6. the driving method of pixel circuit according to claim 5, which is characterized in that the pixel circuit further includes shining Control module, the control terminal of the light emitting control module is for inputting LED control signal, and the first of the light emitting control module It holds and is electrically connected with the second pole of the driving transistor, the second end of the light emitting control module and first light emitting module First end electrical connection；The driving method includes:
In the data write phase, the light emitting control module shutdown is controlled；
In the light emitting phase, the light emitting control module conducting is controlled.
7. the driving method of pixel circuit according to claim 5, which is characterized in that the data write phase, it is described First data voltage writing module and the second data voltage writing module conducting, first data voltage write-in described the The second grid is written in one grid, the second data voltage, comprising:
The data write phase, first Data write. module and second Data write. module simultaneously turn on, described The first grid and the second grid is written in first data voltage and second data voltage simultaneously.
8. the driving method of pixel circuit according to claim 5, which is characterized in that the data write phase includes the One stage and second stage, the first data voltage writing module and the second data voltage writing module conducting, it is described The first grid is written in first data voltage, and the second grid is written in the second data voltage, comprising:
In the first stage, the first Data write. module conducting, the second Data write. module shutdown, described first The first grid is written in data voltage；In the second stage, the second Data write. module conducting, first data The second grid is written in writing module shutdown, second data voltage；
Or the first stage, the second Data write. module conducting, the first Data write. module shutdown, described second The second grid is written in data voltage；In the second stage, the first Data write. module conducting, second data The first grid is written in writing module shutdown, first data voltage.
9. the driving method of pixel circuit according to claim 5, which is characterized in that the grey-scale range of the pixel includes The first preset gray scale range and the second preset gray scale range, within the scope of second preset gray scale, second data Voltage is definite value；Wherein, the minimum gray scale within the scope of second preset gray scale is higher than within the scope of first preset gray scale Highest grayscale.
10. a kind of display device, which is characterized in that including display panel and the driving chip being electrically connected with the display panel, The display panel includes the described in any item pixel circuits of claim 1-4 as the first pixel circuit, first pixel Circuit includes the first data voltage input terminal, the second data voltage input terminal, the first scanning signal input terminal, the second scanning signal Input terminal, first voltage signal input part and second voltage input terminal；The first data voltage input terminal and first number It is electrically connected according to the input terminal of voltage writing module, the first scanning signal input terminal and the first data voltage writing module Control terminal electrical connection, the output end of the first data voltage writing module and it is described drive transistor first grid be electrically connected It connects；The second data voltage input terminal is electrically connected with the input terminal of the second data voltage writing module, and described second sweeps It retouches signal input part to be electrically connected with the control terminal of the second data voltage writing module, the second data voltage writing module Output end with it is described driving transistor second grid be electrically connected；
The display device further include:
The multiple data lines being electrically connected, the first data voltage input are corresponded with multiple output ends of the driving chip End is electrically connected by the corresponding data line with the driving chip, the second data voltage input terminal by with its The corresponding data line is electrically connected with the driving chip；
Scan drive circuit and the multi-strip scanning line being electrically connected with multiple output ends of scan drive circuit one-to-one correspondence, institute It states the first scanning signal input terminal to be electrically connected by the corresponding scan line with the scan drive circuit, described second Scanning signal input terminal is electrically connected by the corresponding scan line with the scan drive circuit.
11. display device according to claim 10, which is characterized in that the first data voltage input terminal and described Two data voltage input terminals are electrically connected with the same data line.
12. display device according to claim 10, which is characterized in that the first data voltage input terminal and described Two data voltage input terminals are electrically connected from the different data lines.
13. display device according to claim 10, which is characterized in that the display panel further includes the second pixel electricity Road, second pixel circuit include third data voltage input terminal, third scanning signal input terminal, the input of tertiary voltage signal End, the 4th voltage signal inputs, third data voltage writing module, drive module, third memory module and the second luminous mould Block；
The control terminal of the third data voltage writing module is electrically connected with the third scanning signal input terminal, the third number It is electrically connected according to the first end of voltage writing module with the third data voltage input terminal, the third data voltage writing module Second end be electrically connected with the control terminal of the drive module；
The first end of the drive module is electrically connected with the tertiary voltage signal input part, the second end of the drive module with The first end of second light emitting module is electrically connected, and the second end of second light emitting module and the 4th voltage signal input End electrical connection；
The first end of the third memory module is electrically connected with the control terminal of the drive module, and the of the third memory module Two ends are electrically connected with the first end of the drive module；
The third data voltage input terminal is electrically connected by the corresponding data line with the driving chip；Described Three scanning signal input terminals are electrically connected by the corresponding scan line with the scan drive circuit.
14. display device according to claim 13, which is characterized in that first light emitting module includes at least red hair Optical module, second light emitting module include at least green emitting module.
15. a kind of driving method of display device, special for driving the described in any item display devices of claim 10-14 Sign is that the driving method includes:
In data write phase, the first data voltage writing module and the second data voltage writing module conducting, the The first grid is written in one data voltage, and the second grid is written in the second data voltage, wherein first data voltage It is corresponded with the display grayscale of pixel, within the scope of the first preset gray scale, second data voltage is for improving the drive The driving current of dynamic transistor；Wherein, the first preset gray scale range is more than or equal to 0 grayscale and to be less than or equal to 128 Grayscale；
Light emitting phase, the driving transistor shine according to first data voltage and second data voltage driving are described Module shines.
16. the driving method of display device according to claim 15, which is characterized in that before data write phase, Further include:
Grayscale test, the grayscale acquisition device and the driving chip are carried out to the display device using grayscale acquisition device Electrical connection, with each corresponding first data voltage of grayscale of determination and second data voltage.
17. the driving method of display device according to claim 16, which is characterized in that described to use grayscale acquisition device Grayscale test is carried out to the display device, with corresponding first data voltage of each grayscale of determination and described second Data voltage, comprising:
The scan drive circuit inputs scanning signal, control the to the first scanning signal input terminal by the scan line The conducting of one data voltage writing module, the driving chip is according to preset the first data voltage model corresponding with pre-display grayscale It encloses, is mentioned by the data line and the first data voltage writing module of conducting to the first grid of the driving transistor For the first data voltage；
The scan drive circuit inputs scanning signal to the second scanning signal input terminal by the scan line, controls institute The conducting of the second data voltage writing module is stated, according to preset the second data voltage model corresponding with the pre-display grayscale It encloses, by the data line and the second data voltage writing module of conducting to the second gate of the driving transistor Pole provides second data voltage；
The grayscale and the pre-display for the display picture that the driving chip is got according to the grayscale acquisition device Grayscale adjusts first data voltage and/or second data voltage with fixed gradient, until the grayscale acquisition device When the grayscale of the display picture got is identical as the pre-display grayscale, by corresponding first data voltage of the grayscale and Second data voltage is determined as corresponding first data voltage of the pre-display grayscale and the second data voltage is stored in the drive In dynamic chip.
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