CN108735145A - Pixel circuit, image element driving method and display device - Google Patents
Pixel circuit, image element driving method and display device Download PDFInfo
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- CN108735145A CN108735145A CN201810515990.0A CN201810515990A CN108735145A CN 108735145 A CN108735145 A CN 108735145A CN 201810515990 A CN201810515990 A CN 201810515990A CN 108735145 A CN108735145 A CN 108735145A
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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]
Abstract
A kind of pixel circuit of present invention offer, image element driving method and display device.The pixel circuit, including light-emitting component, data write unit, switch control unit, resistance unit, driving unit and storage unit, wherein, switch control unit is connected or is not turned on the connection between data write-in node and the control terminal of driving unit under the control of the second grid line；The first end of resistance unit is connect with data write-in node, and the second end of resistance unit and the control terminal of driving unit connect；Storage unit is used to provide control voltage for the control terminal of driving unit；Driving unit drives light-emitting component to shine under the control of its control terminal.The present invention can adjust the light emission luminance of light-emitting component, and inconsistent problem is matched so as to improve white balance, reach more consistent white balance effect, promote display effect.
Description
Technical field
The present invention relates to a kind of display technology field more particularly to pixel circuit, image element driving method and display devices.
Background technology
Micro LED (micro-led) display includes micromation LED (Organic Light Emitting Diode) array structure,
Be miniaturized LED array structure have self-luminous display characteristic, every bit pixel (pixel) can addressing be operated alone it is luminous.
Compared to being all OLED (Organic Light Emitting Diode) technology that self-luminous is shown, not only efficiency is higher by Micro LED, the service life compared with
Long, material, which is not easily susceptible to environment, to be influenced and stablizes relatively, is also avoided that generation ghost phenomena.However Micro light-emitting diode displays exist
When low grayscale is shown and high gray is shown, red green chromaticity coordinates has different degrees of drift.By taking display green as an example, in grayscale
When 100 or less value, the micro-led chromaticity coordinates drift of green is larger, eventually results in white distortion, and display effect becomes
Difference.
Invention content
The main purpose of the present invention is to provide a kind of pixel circuit, image element driving method and display devices, solve existing
Display device the problem of cannot reaching more consistent white balance effect when being shown under different grayscale.
In order to achieve the above object, the present invention provides a kind of pixel circuits, including light-emitting component, and the pixel circuit is also
Including data write unit, switch control unit, resistance unit, driving unit and storage unit, wherein
The data write unit is connect with the first grid line, data line and data write-in node, in the first grid
Under the control of line, be turned on or off the data line and the data write-in node between connection；
The control terminal of the switch control unit and the second grid line, data write-in node and the driving unit connects
It connects, the control under the control of second grid line, being connected or being not turned on data the write-in node and the driving unit
Connection between end processed；
The first end of the resistance unit and the data write-in node are connect, the second end of the resistance unit with it is described
The control terminal of driving unit connects；
The storage unit is connect with the control terminal of the driving unit, for being provided for the control terminal of the driving unit
Control voltage；
The first end of the driving unit is connect with first voltage input terminal, the second end of the driving unit and the hair
First pole of optical element connects, and the driving unit under the control of its control terminal for driving the light-emitting component to shine；
Second pole of the light-emitting component is connect with second voltage input terminal.
When implementation, the switch control unit includes：Controlling transistor is switched, grid is connect with second grid line, the
One pole is connect with data write-in node, and the second pole is connect with the control terminal of the driving unit；
The resistance unit includes：Shunt resistance, first end are connect with data write-in node, second end and the drive
The control terminal of moving cell connects；
The data write unit includes：Data writing transistor, grid are connect with first grid line, the first pole and institute
Data line connection is stated, the second pole is connect with data write-in node.
When implementation, the driving unit includes driving transistor；The grid of the driving transistor is the driving crystal
The control terminal of pipe, the first end of the first extremely described driving transistor of the driving transistor, the of the driving transistor
The second end of the two extremely described driving transistors.
When implementation, the storage unit includes storage capacitance；
The driving transistor is p-type transistor, the grid of the first end of the storage capacitance and the driving transistor
Connection, the second end of the storage capacitance are connect with the first voltage input terminal；Alternatively,
The driving transistor is n-type transistor, the grid of the first end of the storage capacitance and the driving transistor
Connection, the second end of the storage capacitance are connect with second voltage input terminal.
When implementation, pixel circuit of the present invention further includes：Data voltage adjusts unit, is controlled for being adjusted according to voltage
Signal processed controls to adjust the data voltage of the data line output.
When implementation, the light-emitting component is micro-led.
The present invention also provides a kind of image element driving methods, are applied to above-mentioned pixel circuit, the image element driving method
Including：
In the driving stage, data write unit controls the data voltage for exporting data line under the control of the first grid line
Data are written, node is written, switch control unit is connected or is not turned on the data write-in node under the control of the second grid line
Connection between the control terminal of driving unit, to control switch control unit or resistance unit by conducting as storage unit
Charging, storage unit provide control voltage, control of the driving unit in its control terminal for the control terminal of the driving unit
Lower driving light-emitting component shines.
When implementation, the switch control unit is connected or is not turned on the data write-in section under the control of the second grid line
It puts and includes the Connection Step between the control terminal of driving unit：
When the corresponding grayscale value of the data voltage is less than predetermined grayscale value, the switch control unit is described second
The connection being not turned under the control of grid line between the data write-in node and the control terminal of driving unit；When the data voltage
When corresponding grayscale value is greater than or equal to predetermined grayscale value, the switch control unit is connected under the control of second grid line
Connection between the data write-in node and the control terminal of driving unit；Alternatively,
The switch control unit is connected or is not turned on the data write-in node and driving under the control of the second grid line
Connection Step between the control terminal of unit includes：
When the corresponding grayscale value of the data voltage is more than predetermined grayscale value, the switch control unit is described second
The connection being not turned under the control of grid line between the data write-in node and the control terminal of driving unit；When the data voltage
When corresponding grayscale value is less than or equal to predetermined grayscale value, the switch control unit is connected under the control of second grid line
Connection between the data write-in node and the control terminal of driving unit.
When implementation, the pixel circuit further includes that data voltage adjusts unit；
The voltage adjusting control that the driving current of light-emitting component is turned up in instruction is received when the data voltage adjusts unit
When signal, the image element driving method further includes：In the driving stage, the data voltage adjusts unit according to the voltage
Adjusting control signal controls to adjust the data voltage of the data line output, so that the corresponding grayscale value of the data voltage becomes
Greatly；
The voltage adjusting control that the driving current of light-emitting component is turned down in instruction is received when the data voltage adjusts unit
When signal, the image element driving method further includes：In the driving stage, the data voltage adjusts unit according to the voltage
Adjusting control signal controls to adjust the data voltage of the data line output, so that the corresponding grayscale value of the data voltage becomes
It is small.
The present invention also provides a kind of display devices, including above-mentioned pixel circuit.
Compared with prior art, pixel circuit of the present invention, image element driving method and display device can adjust hair
The light emission luminance of optical element matches inconsistent problem so as to improve white balance, reaches more consistent white balance effect, carry
Rise display effect.
Description of the drawings
The structure chart of pixel circuit described in Fig. 1 embodiment of the present invention；
Fig. 2 is the circuit diagram of the first specific embodiment of pixel circuit of the present invention；
Fig. 3 is the circuit diagram of the second specific embodiment of pixel circuit of the present invention；
Fig. 4 is the display base plate 40 and micro-led Mled that the display device described in the embodiment of the present invention includes
Position relationship schematic diagram.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The transistor used in all embodiments of the invention all can be thin film transistor (TFT) or field-effect tube or other characteristics
Identical device.In embodiments of the present invention, to distinguish the two poles of the earth of transistor in addition to grid, wherein first will be known as in a pole
Pole, another pole are known as the second pole.In practical operation, described first can be extremely drain electrode, and described second extremely can be source electrode；Or
Person, described first extremely can be source electrode, and described second extremely can be drain electrode.
As shown in Figure 1, the pixel circuit described in the embodiment of the present invention, including light-emitting element E L, the pixel circuit also wrap
Include data write unit 11, switch control unit 12, resistance unit 13, driving unit 14 and storage unit 15, wherein
The data write unit 11 is connect with the first grid line Gate1, data line Data and data write-in node ND, is used for
Under the control of the first grid line Gate1, it is turned on or off between the data line Data and data write-in node ND
Connection；
The switch control unit 12 and the second grid line Gate2, the data write-in node ND and driving unit 14
Control terminal connection, under the control of the second grid line Gate2, be connected or be not turned on the data write-in node ND with
Connection between the control terminal of the driving unit 14；
The first end of the resistance unit 13 is connect with data write-in node ND, the second end of the resistance unit 13
It is connect with the control terminal of the driving unit 14；
The storage unit 15 is connect with the control terminal of the driving unit 14, for the control for the driving unit 14
End provides control voltage；
The first end of the driving unit 14 is connect with first voltage input terminal, the second end of the driving unit 14 and institute
The first pole connection of light-emitting element E L is stated, the driving unit 14 under the control of its control terminal for driving the light-emitting component
EL shines；
The second pole of the light-emitting element E L is connect with second voltage input terminal.
In the embodiment shown in fig. 1, the first voltage input terminal is for inputting first voltage V1, the second voltage
Input terminal is for inputting second voltage V2.In practical operation, the first voltage V1 can be high voltage Vdd, described second
Voltage can be low-voltage Vss, and but not limited to this.
In practical operation.The light-emitting element E L can be Micro LED (miniature Organic Light Emitting Diode), the hair
The first of optical element EL extremely can be anode, and the second of the light-emitting component can be extremely cathode, and but not limited to this.
Pixel circuit described in the embodiment of the present invention can adjust the light emission luminance of light-emitting component, white flat so as to improve
Weighing apparatus matches inconsistent problem, reaches more consistent white balance effect, promotes display effect.
In the specific implementation, the light-emitting component can be red light-emitting component, green luminousing element or blue-light-emitting member
Part, can by adjusting the light emission luminance of different colours light-emitting component, to adjust different RGB electric current proportionings, with reach compared with
Consistent white balance effect.
At work, in the driving stage, data write unit 11 exists the embodiment of present invention pixel circuit as shown in Figure 1
Under the control of first grid line Gate1, node ND is written in the data voltage Vdata write-in data that data line Data is exported by control,
Switch control unit 12 is connected or is not turned on the data write-in node ND under the control of the second grid line Gate2 and driving is single
Connection between the control terminal of member 14, to control switch control unit 12 or resistance unit 13 by conducting as storage unit 15
Charging, storage unit 15 provide control voltage for the control terminal of the driving unit 14, and the driving unit is in its control terminal
The lower driving light-emitting element E L of control shines.
Node ND is written and drives when the data are connected under control of the switch control unit 12 in the second grid line Gate2
When connection between the control terminal of moving cell 14, it is equivalent between data write-in node ND and the control terminal of driving unit 14 short
Road, then the pixel circuit described in the embodiment of the present invention is identical as existing pixel circuit；And when the switch control unit 12 exists
The connection being not turned under the control of second grid line Gate2 between the data write-in node ND and the control terminal of driving unit 14
When, the data voltage Vdata of write-in data write-in node ND inputs the control of the driving unit 14 by the resistance unit 13
End processed, so that the absolute value of the current potential of the control terminal of the driving unit 14 reduces, so that the hair of light-emitting element E L
Brightness reduces.
According to a kind of specific implementation mode, when the corresponding grayscale values of data voltage Vdata on the data line Data are small
When predetermined grayscale value (the predetermined grayscale value can be selected according to actual conditions), the switch control unit 12 can be in institute
State the company being not turned under the control of the second grid line Gate2 between the data write-in node ND and the control terminal of driving unit 14
It connects；When the corresponding grayscale values of the data voltage Vdata are greater than or equal to predetermined grayscale value, the switch control unit 12 can
To be connected under the control of the second grid line Gate2 between the data write-in node ND and the control terminal of driving unit 14
Connection.That is, data write-in node ND and the driving unit 14 can be connected in the switch control unit 12 under high gray
Control terminal between connection, be not turned under low grayscale data write-in node ND and the control terminal of the driving unit 14 between
Connection.
According to another specific implementation mode, when the corresponding grayscale values of data voltage Vdata on the data line Data
When more than predetermined grayscale value (the predetermined grayscale value can according to actual conditions selected), the switch control unit 12 can be
The company being not turned under the control of the second grid line Gate2 between the data write-in node ND and the control terminal of driving unit 14
It connects；When the corresponding grayscale values of the data voltage Vdata are less than or equal to predetermined grayscale value, the switch control unit 12 can
To be connected under the control of the second grid line Gate2 between the data write-in node ND and the control terminal of driving unit 14
Connection.That is, data write-in node ND and the driving unit 14 can be connected in the switch control unit 12 under low grayscale
Control terminal between connection, be not turned under high gray data write-in node ND and the control terminal of the driving unit 14 between
Connection.
Specifically, the switch control unit may include：Controlling transistor is switched, grid connects with second grid line
It connects, the first pole is connect with data write-in node, and the second pole is connect with the control terminal of the driving unit；
The resistance unit may include：Shunt resistance, first end are connect with data write-in node, second end and institute
State the control terminal connection of driving unit；
The data write unit may include：Data writing transistor, grid are connect with first grid line, the first pole
It is connect with the data line, the second pole is connect with data write-in node.
Specifically, the driving unit may include driving transistor；The grid of the driving transistor is the driving
The control terminal of transistor, the first end of the first extremely described driving transistor of the driving transistor, the driving transistor
The second extremely described driving transistor second end.
Specifically, the storage unit may include storage capacitance；
The driving transistor is p-type transistor, the grid of the first end of the storage capacitance and the driving transistor
Connection, the second end of the storage capacitance are connect with the first voltage input terminal；Alternatively,
The driving transistor is n-type transistor, the grid of the first end of the storage capacitance and the driving transistor
Connection, the second end of the storage capacitance are connect with second voltage input terminal.
Preferably, the pixel circuit described in the embodiment of the present invention can also include：Data voltage adjusts unit, is used for basis
Voltage adjusting control signal controls to adjust the data voltage of the data line output.
In the driving stage, when needing the light emission luminance for controlling light-emitting element E L to increase, the data voltage adjusts unit
Receive the voltage adjusting control signal that the driving current of light-emitting element E L is turned up in instruction, the data voltage adjust unit according to
The voltage adjusting control signal controls to adjust the data voltage Vdata of the data line Data outputs, so that the data are electric
The corresponding grayscale values of pressure Vdata become larger, to promote the light emission luminance of the light-emitting element E L.
In the driving stage, when needing the light emission luminance for controlling light-emitting element E L to reduce, the data voltage adjusts unit
Receive the voltage adjusting control signal that the driving current of light-emitting element E L is turned down in instruction, the data voltage adjust unit according to
The voltage adjusting control signal controls to adjust the data voltage Vdata of the data line Data outputs, so that the data are electric
The corresponding grayscale values of pressure Vdata become smaller, to turn down the light emission luminance of the light-emitting element E L.
In practical operation, the light-emitting component can be micro-led, and but not limited to this.
Illustrate pixel circuit of the present invention below by two specific embodiments.
As shown in Fig. 2, the first specific embodiment of pixel circuit of the present invention includes light-emitting component, data write-in list
Member 11, switch control unit 12, resistance unit 13, driving unit 14, storage unit 15 and data voltage regulation unit are (in Fig. 2
It is not shown), wherein
The light-emitting component is micro-led Mled；The cathode access low-voltage Vss of Mled；
The data write unit 11 includes data writing transistor T1, and the switch control unit 12 includes that switch controls
Transistor T3, the resistance unit 13 include shunt resistance R, and the driving unit 14 includes driving transistor T2, the storage
Unit 15 includes storage capacitance C；
T1, T2 and T3 are p-type transistor；
The grid of T1 is connect with the first grid line Gate1, and the source electrode of T1 is connect with data line Data, the drain electrode of T1 and the of R
One end connects；The drain electrode of T1 is connect with data write-in node ND；
The grid of T3 is connect with the second grid line Gate2, and the source electrode of T3 and the first end of R connect, the drain electrode of T3 and the second of R
End connection；
The grid of T2 and the second end of R connect, and the drain electrode of source electrode access the high voltage Vdd, T2 of T2 and the anode of Mled connect
It connects；
The first end of C and the grid of T2 connect, and the second end of C accesses Vdd；
The data voltage adjusts unit (being not shown in Fig. 2) and is connect with the data line Data, for according to voltage tune
Section control signal SW controls to adjust the data voltage Vdata of the data line Data outputs.
At work, Vdd can be 5V to first specific embodiment of present invention pixel circuit as shown in Figure 2, Vdata's
Value range for example can be 0V-3V, 0V correspond to minimum gray scale value, 3V correspond to highest grayscale value, driving the stage,
The first control signal of Gate1 outputs can be -5V, and the second control signal of Gate2 outputs can be 0.8V, the threshold value electricity of T3
Pressure can be -0.2V, and when the value orientation of Vdata is 1V-3V, the corresponding grayscale values of Vdata are higher, and T1 and T3 are connected,
ND is directly connect with the grid of T2；And when the value range of Vdata is 0V-1V, the corresponding grayscale values of Vdata are relatively low, and T1 is led
Logical, T3 shutdowns, ND is connected by the grid of R and T2, so that the current potential of the current potential ratio ND points of the grid of T2 is low, to reduce stream
The light emission luminance for crossing the driving current Imled, Mled of Mled determines by the driving current Imled for flowing through Mled, the driving current
The light emission luminance of gate source voltage Vgs namely Mled depending on T2 are determined by the grid voltage of T2.The present invention is as shown in Figure 2
First specific embodiment of pixel circuit can further decrease the light emission luminance of Mled under low grayscale.
The formula for flowing through the driving current Imled of Mled is as follows：Wherein, K is
The current coefficient of T2, Vth are the threshold voltage of T2.
First specific embodiment of present invention pixel circuit as shown in Figure 2 at work, when need be turned up Mled it is bright
When spending, the data voltage adjusts unit and receives the voltage adjusting control letter that the driving current of light-emitting element E L is turned up in instruction
Number, the data voltage adjusts the number that unit controls to adjust the data line Data outputs according to the voltage adjusting control signal
According to voltage Vdata, so that the corresponding grayscale values of data voltage Vdata become larger, to promote shining for the light-emitting element E L
Brightness.
In practical operation, Mled is miniature single color LED, for example, Mled can be two pole of miniature emitting red light
Pipe, miniature green LED or miniature blue LED, but not limited to this, and the embodiment of the present invention is applied by control
The current potential of the grid of driving transistor is added to adjust the driving current for flowing through Mled, and then adjusts the light emission luminance of Mled,
So as to adjust different RGB electric current proportionings, to reach more consistent white balance effect.
As shown in figure 3, the second specific embodiment of pixel circuit of the present invention includes light-emitting component, data write-in list
Member 11, switch control unit 12, resistance unit 13, driving unit 14, storage unit 15 and data voltage regulation unit are (in Fig. 3
It is not shown), wherein
The light-emitting component is micro-led Mled；The cathode access low-voltage Vss of Mled；
The data write unit 11 includes data writing transistor T1, and the switch control unit 12 includes that switch controls
Transistor T3, the resistance unit 13 include shunt resistance R, and the driving unit 14 includes driving transistor T2, the storage
Unit 15 includes storage capacitance C；
T1, T2 and T3 are n-type transistor；
The grid of T1 is connect with the first grid line Gate1, and the drain electrode of T1 is connect with data line Data, the source electrode of T1 and the of R
One end connects；The source electrode of T1 is connect with data write-in node ND；
The grid of T3 is connect with the second grid line Gate2, and the drain electrode of T3 is connect with the first end of R, the source electrode of T3 and the second of R
End connection；
The grid of T2 and the second end of R connect, and the source electrode of drain electrode access high voltage Vdd, T2 and the anode of Mled of T2 connect
It connects；
The first end of C and the grid of T2 connect, and the second end of C accesses Vss；
The data voltage adjusts unit (being not shown in Fig. 3) and is connect with the data line Data, for according to voltage tune
Section control signal SW controls to adjust the data voltage Vdata of the data line Data outputs.
At work, Vdd can be 5V to second specific embodiment of present invention pixel circuit as shown in Figure 3, and Vss can be with
Value range for 0V, Vdata for example can be 0V-3V, and 0V corresponds to minimum gray scale value, and 3V corresponds to highest grayscale value,
The first control signal in driving stage, Gate1 outputs can be 5V, and the second control signal of Gate2 outputs can be 2V, T3's
Threshold voltage can be 0.2V, and when the value range of Vdata is 0V-1.8V, the corresponding grayscale values of Vdata are relatively low, T1 and T3
It is all connected, ND is directly connect with the grid of T2；And when the value range of Vdata is 1.8V-3V, the corresponding grayscale values of Vdata
Higher, T1 conductings, T3 shutdowns, ND is connected by the grid of R and T2, so that the current potential of the current potential ratio ND points of the grid of T2 is low,
So that the light emission luminance for reducing the driving current Imled, Mled that flow through Mled is determined by the driving current Imled for flowing through Mled,
The driving current is determined depending on the light emission luminance of the gate source voltage Vgs namely Mled of T2 by the grid voltage of T2.The present invention is such as
Second specific embodiment of pixel circuit shown in Fig. 3 can further decrease the light emission luminance of Mled under high gray.
The formula for flowing through the driving current Imled of Mled is as follows：Wherein, K is
The current coefficient of T2, Vth are the threshold voltage of T2.
Second specific embodiment of present invention pixel circuit as shown in Figure 3 at work, when need be turned up Mled it is bright
When spending, the data voltage adjusts unit and receives the voltage adjusting control letter that the driving current of light-emitting element E L is turned up in instruction
Number, the data voltage adjusts the number that unit controls to adjust the data line Data outputs according to the voltage adjusting control signal
According to voltage Vdata, so that the corresponding grayscale values of data voltage Vdata become larger, to promote shining for the light-emitting element E L
Brightness.
Image element driving method described in the embodiment of the present invention is applied to above-mentioned pixel circuit, the image element driving method
Including：
In the driving stage, data write unit controls the data voltage for exporting data line under the control of the first grid line
Data are written, node is written, switch control unit is connected or is not turned on the data write-in node under the control of the second grid line
Connection between the control terminal of driving unit, to control switch control unit or resistance unit by conducting as storage unit
Charging, storage unit provide control voltage, control of the driving unit in its control terminal for the control terminal of the driving unit
Lower driving light-emitting component shines.
Image element driving method described in the embodiment of the present invention can adjust the light emission luminance of light-emitting component, so as to improve
White balance matches inconsistent problem, reaches more consistent white balance effect, promotes display effect.
According to a kind of specific implementation mode, the switch control unit is connected or is not turned under the control of the second grid line
Connection Step between data write-in node and the control terminal of driving unit may include：
When the corresponding grayscale value of the data voltage is less than predetermined grayscale value, the switch control unit is described second
The connection being not turned under the control of grid line between the data write-in node and the control terminal of driving unit；When the data voltage
When corresponding grayscale value is greater than or equal to predetermined grayscale value, the switch control unit is connected under the control of second grid line
Connection between the data write-in node and the control terminal of driving unit.
According to another specific implementation mode, the switch control unit is connected or does not lead under the control of the second grid line
Leading to the Connection Step that the data are written between node and the control terminal of driving unit may include：
When the corresponding grayscale value of the data voltage is more than predetermined grayscale value, the switch control unit is described second
The connection being not turned under the control of grid line between the data write-in node and the control terminal of driving unit；When the data voltage
When corresponding grayscale value is less than or equal to predetermined grayscale value, the switch control unit is connected under the control of second grid line
Connection between the data write-in node and the control terminal of driving unit.
Preferably, the pixel circuit further includes that data voltage adjusts unit；
The voltage adjusting control that the driving current of light-emitting component is turned up in instruction is received when the data voltage adjusts unit
When signal, the image element driving method further includes：In the driving stage, the data voltage adjusts unit according to the voltage
Adjusting control signal controls to adjust the data voltage of the data line output, so that the corresponding grayscale value of the data voltage becomes
Greatly；
The voltage adjusting control that the driving current of light-emitting component is turned down in instruction is received when the data voltage adjusts unit
When signal, the image element driving method further includes：In the driving stage, the data voltage adjusts unit according to the voltage
Adjusting control signal controls to adjust the data voltage of the data line output, so that the corresponding grayscale value of the data voltage becomes
It is small.
Display device described in the embodiment of the present invention includes above-mentioned pixel circuit.
In the specific implementation, the display device described in the embodiment of the present invention can be monolithic all-colour LED (light emitting diode)
Display device, the display device described in the embodiment of the present invention may include the pel array being set on display base plate, the picture
Pixel array includes the above-mentioned pixel circuit of multiple lines and multiple rows, and LED monochromatic brightness is modulated by the driving current for flowing through it, due to different ashes
When rank shows, RGB color change is unstable, therefore is introduced by different signals, adjusts different RGB electric current proportionings,
To reach more consistent white balance effect.
In Fig. 4, marked as 40 it is display base plate, is micro-led marked as Mled, only illustrates in Fig. 4
Property shows a miniature luminous Mled.
The display device that the embodiment of the present invention is provided can be mobile phone, tablet computer, television set, display, notebook
Any product or component with display function such as computer, Digital Frame, navigator.
The above is the preferred embodiment of the present invention, it is noted that for those skilled in the art
For, without departing from the principles of the present invention, it can also make several improvements and retouch, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (10)
1. a kind of pixel circuit, including light-emitting component, which is characterized in that the pixel circuit further includes data write unit, opens
Close control unit, resistance unit, driving unit and storage unit, wherein
The data write unit is connect with the first grid line, data line and data write-in node, in first grid line
Under control, be turned on or off the data line and the data write-in node between connection；
The switch control unit is connect with the control terminal of the second grid line, data write-in node and the driving unit, is used
Under the control in second grid line, be connected or be not turned on data write-in node and the driving unit control terminal it
Between connection；
The first end of the resistance unit is connect with data write-in node, the second end of the resistance unit and the driving
The control terminal of unit connects；
The storage unit is connect with the control terminal of the driving unit, for providing control for the control terminal of the driving unit
Voltage；
The first end of the driving unit is connect with first voltage input terminal, the second end of the driving unit and the luminous member
First pole of part connects, and the driving unit under the control of its control terminal for driving the light-emitting component to shine；
Second pole of the light-emitting component is connect with second voltage input terminal.
2. pixel circuit as described in claim 1, which is characterized in that the switch control unit includes：Switch control crystal
Pipe, grid are connect with second grid line, and the first pole is connect with data write-in node, the second pole and the driving unit
Control terminal connects；
The resistance unit includes：Shunt resistance, first end are connect with data write-in node, and second end is single with the driving
The control terminal connection of member；
The data write unit includes：Data writing transistor, grid are connect with first grid line, the first pole and the number
It is connected according to line, the second pole is connect with data write-in node.
3. pixel circuit as described in claim 1, which is characterized in that the driving unit includes driving transistor；The drive
The grid of dynamic transistor is the control terminal of the driving transistor, the first extremely described driving transistor of the driving transistor
First end, the second end of the second extremely described driving transistor of the driving transistor.
4. pixel circuit as claimed in claim 3, which is characterized in that the storage unit includes storage capacitance；
The driving transistor is p-type transistor, and the first end of the storage capacitance is connect with the grid of the driving transistor,
The second end of the storage capacitance is connect with the first voltage input terminal；Alternatively,
The driving transistor is n-type transistor, and the first end of the storage capacitance is connect with the grid of the driving transistor,
The second end of the storage capacitance is connect with second voltage input terminal.
5. the pixel circuit as described in any claim in Claims 1-4, which is characterized in that further include：Data voltage tune
Unit is saved, the data voltage for controlling to adjust the data line output according to voltage adjusting control signal.
6. the pixel circuit as described in any claim in Claims 1-4, which is characterized in that the light-emitting component is micro-
Type light emitting diode.
7. a kind of image element driving method is applied to the pixel circuit as described in any claim in claim 1 to 6, special
Sign is that the image element driving method includes：
In the driving stage, under the control of the first grid line, the data voltage that control exports data line is written data write unit
Node is written in data, and switch control unit is connected or is not turned on the data write-in node under the control of the second grid line and drive
Connection between the control terminal of moving cell is filled by the switch control unit or resistance unit be connected as storage unit using control
Electricity, storage unit provide control voltage for the control terminal of the driving unit, and the driving unit is under the control of its control terminal
Light-emitting component is driven to shine.
8. image element driving method as claimed in claim 7, which is characterized in that control of the switch control unit in the second grid line
Under system, being connected or be not turned on the Connection Step between the data write-in node and the control terminal of driving unit includes：
When the corresponding grayscale value of the data voltage is less than predetermined grayscale value, the switch control unit is in second grid line
Control under be not turned on connection between data write-in node and the control terminal of driving unit；When the data voltage corresponds to
Grayscale value when being greater than or equal to predetermined grayscale value, described in the switch control unit is connected under the control of second grid line
The connection between node and the control terminal of driving unit is written in data；Alternatively,
The switch control unit is connected or is not turned on the data write-in node and driving unit under the control of the second grid line
Control terminal between Connection Step include：
When the corresponding grayscale value of the data voltage is more than predetermined grayscale value, the switch control unit is in second grid line
Control under be not turned on connection between data write-in node and the control terminal of driving unit；When the data voltage corresponds to
Grayscale value when being less than or equal to predetermined grayscale value, described in the switch control unit is connected under the control of second grid line
The connection between node and the control terminal of driving unit is written in data.
9. image element driving method as claimed in claim 7, which is characterized in that the pixel circuit further includes that data voltage is adjusted
Unit；
The voltage adjusting control signal that the driving current of light-emitting component is turned up in instruction is received when the data voltage adjusts unit
When, the image element driving method further includes：In the driving stage, the data voltage adjusts unit and is adjusted according to the voltage
Control signal controls to adjust the data voltage of the data line output, so that the corresponding grayscale value of the data voltage becomes larger；
The voltage adjusting control signal that the driving current of light-emitting component is turned down in instruction is received when the data voltage adjusts unit
When, the image element driving method further includes：In the driving stage, the data voltage adjusts unit and is adjusted according to the voltage
Control signal controls to adjust the data voltage of the data line output, so that the corresponding grayscale value of the data voltage becomes smaller.
10. a kind of display device, which is characterized in that include the pixel electricity as described in any claim in claim 1 to 6
Road.
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| CN201810515990.0A CN108735145B (en) | 2018-05-25 | 2018-05-25 | Pixel circuit, pixel driving method and display device |
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| CN108735145B (en) | 2020-08-11 |
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