CN109817159A - A kind of pixel-driving circuit and display device - Google Patents
A kind of pixel-driving circuit and display device Download PDFInfo
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- CN109817159A CN109817159A CN201910253242.4A CN201910253242A CN109817159A CN 109817159 A CN109817159 A CN 109817159A CN 201910253242 A CN201910253242 A CN 201910253242A CN 109817159 A CN109817159 A CN 109817159A
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Abstract
The embodiment of the invention provides a kind of pixel-driving circuit and display devices, solve the lower technical problem of the contrast of the display screen of prior art middle high-resolution and large screen.Pixel-driving circuit provided in an embodiment of the present invention, including voltage memory module, luminescent device and luminous drive module, in the driving light emitting module driving luminescent device luminous stage, the driving current that voltage memory module generates driving light emitting module shunts, i.e., driving current charges to voltage memory module, when charging starting, the anode voltage of luminescent device does not reach the cut-in voltage of luminescent device, luminescent device does not shine, after voltage memory module is filled certain electricity, luminescent device shines；The driving circuit of the embodiment of the present invention is actually to extend luminescent device non-luminous time, thereby reduces the average current of zero grayscale, so that brightness of the display screen in black picture reduces, increases the contrast of display screen.
Description
Technical field
The present invention relates to field of display technology, and in particular to a kind of pixel-driving circuit and display device.
Background technique
Electronic product is higher and higher for the resolution ratio for showing screen at present, but the increasing of the size with display screen
Greatly, cause the charging time to reduce and load to increase, thereby reduce the contrast of the display screen of electronic product.
Summary of the invention
In view of this, solving existing skill the embodiment of the invention provides a kind of pixel-driving circuit and display device
The lower technical problem of the contrast of the display screen of art middle high-resolution and large screen.
For the purpose of the present invention, technological means and advantage is more clearly understood, below in conjunction with attached drawing to the present invention make into
One step is described in detail.Obviously, the described embodiments are only a part but not all of the embodiments of the present application.Base
Embodiment in the application, it is obtained by those of ordinary skill in the art without making creative efforts it is all its
His embodiment, shall fall in the protection scope of this application.
According to an aspect of the present invention, the embodiment of the invention provides a kind of pixel-driving circuits, comprising: driving shines
One end of module, the driving light emitting module receives supply voltage；Luminescent device is electrically connected, institute with the driving light emitting module
Luminescent device is stated to shine under the driving of the driving light emitting module；And voltage memory module, the voltage memory module are used
The driving current generated when shunting the driving light emitting module and driving the luminescent device luminous.
In one embodiment, one end of the voltage memory module is electrically connected with the anode of the luminescent device, the electricity
The other end of pressure memory module is electrically connected with power output end.
In one embodiment, the pixel-driving circuit further comprises: initialization module, and the initialization module receives
First scanning signal, the initialization module according to first scanning signal control the luminescent device anode whether with just
The output end of beginningization power supply connects；Wherein, one end of the voltage memory module is electrically connected with the anode of the luminescent device, institute
The other end for stating voltage memory module is electrically connected with the initialization power output end.
In one embodiment, the supply voltage is DC voltage.
In one embodiment, the voltage memory module includes first capacitor.
In one embodiment, the pixel-driving circuit further comprises: data memory module, for storing data signal
Voltage；And data storage control module, for receiving the second scanning signal, the data storage control module is according to
Second scanning signal controls whether the voltage data signal is stored in the data memory module.
In one embodiment, the data storage control module includes at least one thin film transistor (TFT).
In one embodiment, the pixel-driving circuit further comprises: being connected on power output end and the photophore
Light emitting control module between the anode of part, the light emitting control module receive LED control signal, the light emitting control module
Control whether the power output end connect with the anode of the luminescent device according to the LED control signal.
In one embodiment, the pixel driver route further comprises: initialization module, data memory module, data
Storage control module and light emitting control module, in which: the driving light emitting module includes driving transistor, the driving crystal
The source electrode of pipe is connect with the output end of the power supply；The data memory module include the second capacitor, the one of second capacitor
End is connect with the output end of power supply, and the other end of second capacitor is connect with the grid of the driving transistor；The data
Storage control module includes first film transistor and the second thin film transistor (TFT), wherein the grid of the first film transistor with
The grid of second thin film transistor (TFT) receives second scanning signal, and the source electrode of the first film transistor receives data
Signal voltage, the drain electrode of the first film transistor are connect with the source electrode of the driving transistor；The initialization module packet
Third thin film transistor (TFT) and the 4th thin film transistor (TFT) are included, wherein the grid of the third thin film transistor (TFT) and the 4th film
The grid of transistor receives first scanning signal, the source electrode of the third thin film transistor (TFT) and the one of second capacitor
End connection, the drain electrode of the third thin film transistor (TFT) receive initialization voltage, and the source electrode of the 4th thin film transistor (TFT) receives institute
Initialization voltage is stated, the drain electrode of the 4th thin film transistor (TFT) is connect with the anode of the luminescent device；The light emitting control mould
Block includes the 5th thin film transistor (TFT) and the 6th thin film transistor (TFT), wherein the grid of the 5th thin film transistor (TFT) and described the
The grid of six thin film transistor (TFT)s receives LED control signal, and the source electrode of the 5th thin film transistor (TFT) receives supply voltage, institute
The drain electrode for stating the 5th thin film transistor (TFT) is connect with the source electrode of the driving transistor, the drain electrode of the 6th thin film transistor (TFT) and institute
The drain electrode connection of driving transistor is stated, the source electrode of the 6th thin film transistor (TFT) is connect with the anode of the luminescent device；It is described
One end of first capacitor is connect with the anode of the luminescent device, one end of the first capacitor connect with power output end or
It is connect with initialization power output end.
In one embodiment, at least one described thin film transistor (TFT) is P-type TFT.
As a second aspect of the invention, one embodiment of the invention provide a kind of display device, including multiple pixels with
And multiple pixel-driving circuits as described in aforementioned, wherein each pixel-driving circuit drives each pixel operation.
Pixel-driving circuit provided in an embodiment of the present invention, including voltage memory module, luminescent device and the driving that shines
Module, in the driving light emitting module driving luminescent device luminous stage, the drive that voltage memory module generates driving light emitting module
Streaming current is shunted, that is, and driving current charges to voltage memory module, when charging originates, the anode electricity of luminescent device
Pressure does not reach the cut-in voltage of luminescent device, and luminescent device does not shine, after voltage memory module is filled certain electricity, hair
Optical device shines, accordingly, with respect to there is no a voltage memory module, driving light emitting module directly drive the circuit of luminescent device and
Speech, the driving circuit of the embodiment of the present invention are actually to extend luminescent device non-luminous time, thereby reduce zero grayscale
Average current increase the contrast of display screen so that brightness of the display screen in black picture reduces.
Detailed description of the invention
Fig. 1 show a kind of circuit diagram of pixel-driving circuit of one embodiment of the invention offer；
Fig. 2 show another embodiment of the present invention provides a kind of pixel-driving circuit circuit diagram；
Fig. 3 show another embodiment of the present invention provides a kind of pixel-driving circuit circuit diagram；
Fig. 4 show another embodiment of the present invention provides a kind of pixel-driving circuit circuit diagram；
Fig. 5 show another embodiment of the present invention provides a kind of pixel-driving circuit circuit diagram；
Fig. 6 show a kind of timing control figure of pixel-driving circuit of one embodiment of the invention offer.
Specific embodiment
As described in background, the contrast of the display screen of prior art middle high-resolution and large screen is lower, from
And the display effect of display screen is influenced, inventor is to show the resolution of screen the study found that there is the reason of this problem
Rate is higher and higher, and the time as charging to pixel is caused to reduce, so that average current of the display screen in luminescence process
Increase, thereby reduces the comparison of display screen.
Based on this, the present invention provides a kind of pixel-driving circuits, the display applied to driving high resolution and large screen
Screen shine, by extend display screen in luminescent device non-luminous time (show screen show black picture when
Between), the average current of zero grayscale is thereby reduced, so that brightness of the display screen in black picture reduces, is increased aobvious
The contrast of display screen curtain.
Specifically, pixel-driving circuit provided by the invention, comprising: driving light emitting module, the driving light emitting module
One end receives supply voltage；Luminescent device is electrically connected with the driving light emitting module, and the luminescent device shines in the driving
It shines under the driving of module；And voltage memory module, the voltage memory module are driven for shunting the driving light emitting module
Move the driving current generated when the luminescent device shines.
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 description, it is clear that the described embodiment is only a part of the embodiment of the present invention, instead of all the embodiments.Based on this
Embodiment in invention, every other reality obtained by those of ordinary skill in the art without making creative efforts
Example is applied, shall fall within the protection scope of the present invention.
Fig. 1 to Fig. 5 is used to show a kind of circuit diagram of pixel-driving circuit provided in an embodiment of the present invention.The present invention is implemented
The pixel-driving circuit that example provides, as shown in Figures 1 to 5, comprising: driving light emitting module drives one end of light emitting module to receive
Supply voltage；Luminescent device OLED is electrically connected with driving light emitting module, and luminescent device OLED is under the driving of driving light emitting module
It shines；And voltage memory module, when voltage memory module shines for shunting driving light emitting module driving luminescent device OLED
The electric current of generation.In the driving light emitting module driving luminescent device OLED luminous stage, voltage memory module is to the luminous mould of driving
Block generate driving current shunted because each luminescent device OLED have open need cross-pressure (i.e. anode voltage with
The pressure difference of cathode voltage), therefore (the driving current when the driving current for driving transistor to generate is shunted by voltage memory module
Charge to voltage memory module), the unlatching electricity of luminescent device OLED has not been reached yet in the anode voltage of luminescent device OLED
Pressure (such as OLED cross-pressure is less than 2V), therefore luminescent device OLED does not shine, when driving current fills voltage memory module
When the certain electricity of electricity, i.e., cut-in voltage of the end the N1 voltage of voltage memory module equal to luminescent device OLED (such as deposit by voltage
Storage module is charged to 2V, i.e. the voltage at the end N1 of voltage storage mould is 2V), the anode voltage and voltage of luminescent device OLED is deposited
The voltage for storing up the end N1 of module is equal, and right up to the cut-in voltage of luminescent device OLED, luminescent device start to shine.Therefore,
For there is no voltage memory module, driving light emitting module to directly drive the circuit of luminescent device, the embodiment of the present invention
Driving circuit is actually to extend luminescent device non-luminous time, thereby reduces the average current of zero grayscale, therefore make
It must show that brightness of the screen in black picture reduces, increase the contrast of display screen.
It should be appreciated that luminescent device refers to send out the device of visible light, can be as described above has
Machine light emitting diode (referred to as: OLED) is also possible to light emitting diode (referred to as: LED) etc., and the embodiment of the present invention is to luminescent device
Specific type be not construed as limiting.
The driving current that driving light emitting module drives the luminescent device to generate when shining is shunted as voltage memory module
Shunting mode, can be as shown in Figure 1, that is, voltage memory module one end is electrically connected with supply voltage Vdd output end, one end with
The anode of luminescent device OLED is electrically connected, as shown in Figure 1, the pixel-driving circuit includes: driving light emitting module, luminescent device
OLED, data memory module and data storage control module.Wherein driving light emitting module respectively with supply voltage output end, number
Be electrically connected according to memory module and luminescent device, data memory module respectively with data storage control module, data signal line with
And driving light emitting module electrical connection, data storage control module are electrically connected with data memory module and receive the second scanning signal
Scan2；Data storage control module controls the voltage data signal from data signal line under the action of the second scanning signal
Whether Vdata is transferred to data memory module；One end of voltage memory module is connect with supply voltage Vdd output end, another
End is connect with the anode of luminescent device OLED.Light emitting module is driven to receive supply voltage Vdd and voltage data signal
Vdata, and the voltage difference of supply voltage Vdd and voltage data signal Vdata are changed into driving current, and by driving current
It is transmitted separately in luminescent device OLED and voltage memory module.Pixel-driving circuit provided in an embodiment of the present invention, works as drive
After the voltage difference of supply voltage Vdd and voltage data signal Vdata are changed into driving current by dynamic light emitting module, driving current
It is shunted by voltage memory module, when the driving current that voltage memory module generates driving transistor shunts, when
When the cut-in voltage of luminescent device OLED has not been reached yet in the anode voltage of luminescent device OLED, luminescent device OLED does not shine,
When driving current charge to voltage memory module certain electricity, i.e., the end the N1 voltage of voltage memory module, which is equal to, shines
The cut-in voltage (such as voltage memory module is charged to 2V, i.e. the voltage at the end N1 of voltage storage mould is 2V) of device OLED,
Luminescent device starts to shine.Accordingly, with respect to not having voltage memory module, driving light emitting module directly drives the electricity of luminescent device
For road, the driving circuit of the embodiment of the present invention is actually to extend luminescent device non-luminous time, thereby reduces zero
The average current of grayscale increases the contrast of display screen so that brightness of the display screen in black picture reduces.
In a preferred embodiment, data memory module includes at least one second capacitor C2.
In a preferred embodiment, luminous drive module includes at least one driving transistor, more preferably one
In embodiment, the drive module that shines includes a driving transistor M7, as shown in Figure 4 and Figure 5.
In one embodiment, voltage memory module includes first capacitor C1, as shown in Figure 4 and Figure 5, when driving light emitting module
When generating driving current and luminescent device OLED being driven to shine, driving current can be also transferred in first capacitor C1, when first
When capacitor C1 is filled certain electricity, i.e., the voltage at the end N1 of first capacitor C1 be equal to luminescent device OLED cut-in voltage, by
It is equal in the anode voltage of luminescent device OLED and the voltage at the end N1 of first capacitor C1, therefore luminescent device starts to shine.
In a preferred embodiment, data storage control module includes at least one thin film transistor (TFT), more one
In preferred embodiment, data storage control module includes first film transistor M1 and the second thin film transistor (TFT) M2, such as Fig. 4 and figure
Shown in 5, wherein wherein the grid of the grid of first film transistor M1 and the second thin film transistor (TFT) M2 receive the second scanning
The source electrode of signal Scan2, first film transistor M1 are electrically connected with data signal line, the drain electrode of first film transistor M1 and the
The source electrode of two thin film transistor (TFT) M2 is connected and is connect with one end of the second capacitor C2, the drain electrode and driving of the second thin film transistor (TFT) M2
One end of light emitting module connects, and first film transistor M1 and the second thin film transistor (TFT) M2 are used in the second scanning signal Scan2
Control under whether the voltage data signal Vdata from data signal line is transmitted to one end of the second capacitor C2.
In an alternative embodiment of the invention, pixel-driving circuit further comprises initialization module, wherein initialization module
It is electrically connected respectively with the first scanning signal control line, initialization voltage Vref output end and luminescent device OLED, initializes mould
Block controlled under the action of from the first scanning signal Scan1 of the first scanning signal control line initialization voltage Vref whether by
It is transmitted to the anode of luminescent device OLED, the anode voltage of luminescent device OLED is reset with realizing, i.e., to luminescent device
The anode voltage of OLED initializes.In the pixel-driving circuit, voltage memory module is shunted described in driving light emitting module driving
The shunting mode of electric current that luminescent device generates when shining can be accomplished by the following way: respectively and just by voltage memory module
The electrical connection of the anode of beginningization voltage Vref output end and luminescent device OLED, as shown in Figure 2.
In a further embodiment, initialization module is also connect with data memory module, for storing mould to data
Block is initialized, as shown in figure 5, initialization module includes third thin film transistor (TFT) M3 and the 4th thin film transistor (TFT) M4,
The grid of middle third thin film transistor (TFT) M3 and the grid of the 4th thin film transistor (TFT) M4 receive the first scanning signal Scan1, the
The source electrode of three thin film transistor (TFT) M3 is connect with data memory module, the drain electrode of third thin film transistor (TFT) M3 and the 4th thin film transistor (TFT)
The source electrode of M4 connects, and the drain electrode of the 4th thin film transistor (TFT) M4 is connect with the anode of luminescent device OLED, third thin film transistor (TFT) M3
Drain electrode and the source electrode of the 4th thin film transistor (TFT) M4 connect with the output end of initialization voltage Vref, for receiving initialization
Voltage Vref.When third thin film transistor (TFT) M3 and the 4th thin film transistor (TFT) M4 are led under the action of the first scanning signal Scan1
When logical, the conducting of third thin film transistor (TFT) M3 is so that initialization voltage Vref is transferred to one end of data memory module, with reality
Now to the resetting of the voltage of data memory module, i.e., data memory module is initialized；4th thin film transistor (TFT) M4's leads
It is logical so that initialization voltage Vref is transferred to the anode of luminescent device OLED, to realize the anode voltage of luminescent device OLED
Resetting, the i.e. initialization to the anode of luminescent device OLED.
It should be appreciated that voltage memory module shunts the electricity that driving light emitting module drives the luminescent device to generate when shining
The situation that the connection type of other modules can be as described above in stream, voltage memory module and pixel-driving circuit, but this
Inventive embodiments to this and without limitation, as long as the anode of one end of voltage memory module and luminescent device connects, the other end with
The electric current generated when shunting driving light emitting module driving luminescent device can be realized in the output end connection for being capable of providing voltage, because
This, the embodiment of the present invention is not construed as limiting voltage memory module and the connection type of other modules in pixel-driving circuit.
In one embodiment, pixel-driving circuit further include: luminescent device and be connected on power output end and luminescent device
Anode between light emitting control module, wherein the anode of luminescent device is connect with luminous drive module.As shown in figure 3, shining
Control module receive LED control signal EM, light emitting control module according to LED control signal EM control power output end whether with
The anode of luminescent device connects.
In one embodiment, light emitting control module includes at least one thin film transistor (TFT).In a preferred embodiment, it shines
Control module includes the 5th thin film transistor (TFT) M5 and the 6th thin film transistor (TFT) M6, as shown in Figure 4 and Figure 5, the 5th thin film transistor (TFT)
The grid of the grid of M5 and the 6th thin film transistor (TFT) M6 receive LED control signal EM, the 5th thin film transistor (TFT) M5 and
Six thin film transistor (TFT) M6 on or off under LED control signal EM control；Wherein, the drain electrode of the 5th thin film transistor (TFT) M5
It is connect with data memory module, the source electrode of the 5th thin film transistor (TFT) M5 is connect with the source electrode of driving transistor M7；6th film is brilliant
The source electrode of body pipe M6 is connect with the anode of luminescent device OLED, the drain electrode and the leakage of driving transistor M7 of the 6th thin film transistor (TFT) M6
Pole connection.When the 5th thin film transistor (TFT) M5 is connected with the 6th thin film transistor (TFT) M6, the conducting of the 5th thin film transistor (TFT) M5 can
So that the source electrode that supply voltage Vdd is transported to driving transistor M7, which to drive, forms pressure between the grid and source electrode of transistor M7
Poor Vdata-Vdd.The conducting of 6th thin film transistor (TFT) M6 enables to the drain electrode of driving transistor M7 and the anode of luminescent device
Connection, the electric current that driving transistor M7 is formed is transmitted in luminescent device OLED, so that luminescent device shines.
The luminescent device is driven to generate when shining it should be understood that voltage memory module shunts driving light emitting module
The shunting mode of driving current can be selected according to specific circuit structure, such as can be as described above, voltage storage
One end of module is connect with the anode of luminescent device OLED, the other end and supply voltage output end of voltage memory module or first
The connection of beginningization voltage output end, can also be with the first scanning signal output end, the second scanning signal output end and light emitting control
Signal output end connection, the embodiment of the present invention shunt driving light emitting module for voltage memory module and the luminescent device are driven to send out
The shunting mode for the driving current that light time generates is not construed as limiting.
But since the first scanning signal, the second scanning signal and LED control signal are AC signal, in photophore
When part shines, it may occur that mura risk when low ash rank.Therefore, the anode of one end of voltage memory module and luminescent device connects
It connects, the other end and supply voltage output end (output is direct current signal) or initialization voltage output end of voltage memory module
(output is direct current signal) connection, when luminescent device shines, mistake will not be generated, and then will not reduce low ash rank
Mura risk.
In order to enable better understand above-mentioned pixel-driving circuit, lower face bonding more specifically embodiment to described above
The course of work of pixel circuit is described in detail.
Fig. 4 is a kind of circuit diagram for pixel-driving circuit that one embodiment of the invention provides, and it is real that Fig. 6 show the present invention one
The driving signal timing diagram of the pixel circuit of example offer is applied, as shown in figure 4, a kind of pixel-driving circuit includes: data storage mould
Block, data storage control module, initialization module, light emitting control module, shine drive module, voltage memory module and shine
Device OLED；The drive module that wherein shines includes a driving transistor M7, and data memory module includes a second capacitor C2,
Voltage memory module includes a first capacitor C1, and data storage control module includes that first film transistor M1 and second are thin
Film transistor M2, initialization module include third thin film transistor (TFT) M3 and the 4th thin film transistor (TFT) M4, light emitting control module packet
Include the 5th thin film transistor (TFT) M5 and the 6th thin film transistor (TFT) M6；The wherein grid of first film transistor M1 and the second film
The grid of transistor M2 is connect with the second scan signal line for providing the second scanning signal Scan2 of reception, the first film
The source electrode of transistor M1 is connect with voltage data signal Vdata output end, the drain electrode of first film transistor M1 and driving crystal
The source electrode of pipe M7 connects, the source electrode of the second thin film transistor (TFT) M2 respectively with one end of the second capacitor C2 and driving transistor M7
Grid connection, the second thin film transistor (TFT) M2 drain electrode with driving transistor M7 drain electrode connect, the other end of the second capacitor C2 and
The grid of the connection of supply voltage Vdd output end, the grid of the 5th thin film transistor (TFT) M5 and the 6th thin film transistor (TFT) M6 with use
It is connected in the LED control signal line for providing LED control signal EM, the drain electrode of the 5th thin film transistor (TFT) M5 and supply voltage Vdd
The source electrode of output end connection, the 5th thin film transistor (TFT) M5 is connect with the source electrode of driving transistor M7, the 6th thin film transistor (TFT) M6's
It draining and is connect with the drain electrode of driving transistor M7, the source electrode of the 6th driving transistor M6 is connect with the anode of luminescent device OLED,
The grid of third thin film transistor (TFT) M3 and the grid of the 4th thin film transistor (TFT) M4 are and for providing the first scanning signal Scan1
The connection of the first scan signal line, the source electrode of third thin film transistor (TFT) M3 connect with one end of the second capacitor C2, third film crystalline substance
The drain electrode of body pipe M3 is connect with the source electrode of the 4th thin film transistor (TFT) M4, the drain electrode of the 4th thin film transistor (TFT) M4 and and luminescent device
The anode of OLED connects, and one end of first capacitor C1 is connect with supply voltage Vdd output end, the other end and hair of first capacitor C1
The anode of optical device OLED connects.
As shown in connection with fig. 6, the course of work of pixel-driving circuit described in Fig. 4 is as follows:
(1) initial phase T1:
Apply the grid with the first scanning signal Scan1 to third thin film transistor (TFT) M3 of first voltage amplitude and the
The grid of four thin film transistor (TFT) M4, the first scanning signal Scan1 with first voltage amplitude make third thin film transistor (TFT) M3
And the 4th thin film transistor (TFT) M4 conducting；Applying has the second scanning signal Scan2 of second voltage amplitude to the first film crystalline substance
The grid of the grid of body pipe M1 and the second thin film transistor (TFT) M2, the second scanning signal Scan2 with second voltage amplitude make
Obtain first film transistor M1 and the second thin film transistor (TFT) M2 cut-off；Apply the LED control signal with second voltage amplitude
EM is to the grid of the 5th thin film transistor (TFT) M5 and the grid of the 6th thin film transistor (TFT) M6, the luminous control with second voltage amplitude
Signal EM processed ends the 5th thin film transistor (TFT) M5 and the 6th thin film transistor (TFT) M6.
Since the 4th thin film transistor (TFT) M4 is connected, the anode voltage of luminescent device OLED is Vref, by the sun of luminescent device
Electrode potential initialization, guarantees that OLED inverts to form black state；Third thin film transistor (TFT) M3 is connected so that the end Q1 of the second capacitor C2
Voltage is Vref, removes the current potential of the end the Q1 storage of the second capacitor C2；The grid voltage for driving transistor M7 is Vref.
(2) data write phase T2:
Apply the grid with the second scanning signal Scan2 to first film transistor M1 of first voltage amplitude and the
The grid of two thin film transistor (TFT) M2, the second scanning signal Scan2 with first voltage amplitude make first film transistor M1
And second thin film transistor (TFT) M2 conducting；Applying has the first scanning signal Scan1 of second voltage amplitude brilliant to third film
The grid of body pipe M3 and the grid of the 4th thin film transistor (TFT) M4, the first scanning signal Scan1 with second voltage amplitude make
Obtain third thin film transistor (TFT) M3 and the 4th thin film transistor (TFT) M4 cut-off；Apply the LED control signal with second voltage amplitude
EM is to the grid of the 5th thin film transistor (TFT) M5 and the grid of the 6th thin film transistor (TFT) M6, the luminous control with second voltage amplitude
Signal EM processed ends the 5th thin film transistor (TFT) M5 and the 6th thin film transistor (TFT) M6.
Due to the conducting of first film transistor M1, the voltage of tie point 1 is equal to Vdata in pixel circuit；Due to driving
The grid voltage of transistor M7 is first voltage amplitude, i.e. driving transistor M7 is also conducting, therefore, is connected in pixel circuit
The voltage of point 3 is also equal to Vdata；The voltage of tie point 3 is equal in conducting and pixel circuit due to the second thin film transistor (TFT) M2
The voltage of Vdata, the end Q1 of the second capacitor C2 are also equal to Vdata.
(3) display device light emitting phase T3:
Apply the grid and the 6th with the LED control signal EM to the 5th thin film transistor (TFT) M5 of first voltage amplitude
The grid of thin film transistor (TFT) M6, the LED control signal EM with first voltage amplitude make the 5th thin film transistor (TFT) M5 and the
Six thin film transistor (TFT) M6 conducting；Apply the second scanning signal Scan2 to first film transistor M1 with second voltage amplitude
Grid and the second thin film transistor (TFT) M2 grid, make first with the second scanning signal Scan2 of second voltage amplitude
Thin film transistor (TFT) M1 and the second thin film transistor (TFT) M2 cut-off；Apply the first scanning signal Scan1 with second voltage amplitude
To the grid of third thin film transistor (TFT) M3 and the grid of the 4th thin film transistor (TFT) M4, the first scanning with second voltage amplitude
Signal Scan1 ends third thin film transistor (TFT) M3 and the 4th thin film transistor (TFT) M4；
Due to the conducting of the 5th thin film transistor (TFT) M5, so that the source voltage of driving transistor M7 is equal to supply voltage Vdd,
The pressure difference of the grid voltage and source voltage that drive transistor M7 is equal to Vdd-V data, to generate driving current；Due to
The conducting of six thin film transistor (TFT) M6, the electric current that driving transistor M7 is generated are transmitted to first capacitor C1 and photophore
The anode of part OLED.
When the 6th thin film transistor (TFT) M6 conducting, the driving current that driving transistor M7 is generated is transmitted separately to first capacitor
The anode of C1 and OLED, when the cut-in voltage of OLED has not been reached yet in the anode voltage of OLED, OLED does not shine, and works as driving
Electric current to first capacitor C1 charge certain electricity when, i.e., the voltage at the end N1 of first capacitor C1 equal to OLED unlatching electricity
Pressure, the anode voltage of OLED are right up to the cut-in voltage of OLED, and OLED starts to shine.Accordingly, with respect to no first capacitor
C1, for driving transistor directly drives the circuit of luminescent device, the driving circuit of the embodiment of the present invention is actually to extend
Luminescent device non-luminous time, the average current of zero grayscale is thereby reduced, so that display screen is in black picture
Brightness reduces, and increases the contrast of display screen.
It should be appreciated that the second capacitor C1 can also be arranged in luminescent device OLED anode and initialization voltage output end it
Between, i.e., the both ends of first capacitor C1 are connect with the anode of luminescent device OLED and initialization voltage output end respectively, such as Fig. 5 institute
Show.
It should be appreciated that the thin film transistor (TFT) that the above embodiment of the present invention provides, such as driving transistor M7, the first film are brilliant
Body pipe M1, the second thin film transistor (TFT) M2, third thin film transistor (TFT) M3, the 4th thin film transistor (TFT) M4, the 5th thin film transistor (TFT) M5 with
And the 6th thin film transistor (TFT) M6 be PMOS tube, first voltage amplitude is low level voltage value, second voltage amplitude is high electricity
Flat voltage value.Similarly, multiple tTransistor portions in pixel circuit can also be divided into PMOS tube, part by those skilled in the art
For NMOS tube, the voltage magnitude being applied in respective transistor changes with the type of crystal light, such as in the same pixel
In circuit, if first film transistor M1, the second thin film transistor (TFT) M2 are PMOS tube, it is applied to first film transistor M1
Grid, the second thin film transistor (TFT) M2 the first voltage amplitude of the second scanning signal Scan2 of grid be then low level electricity
Pressure value；If third thin film transistor (TFT) M3 and the 4th thin film transistor (TFT) M4 are NMOS tube, it is applied to third thin film transistor (TFT)
The first voltage amplitude of first scanning signal Scan1 of the grid of the grid of M3 and the 4th thin film transistor (TFT) M4 is then high level
Voltage value.Therefore the present invention to the type of the transistor in above-mentioned pixel-driving circuit and is applied in respective transistor
Signal voltage amplitude is without limitation.
The embodiment of the invention also provides a kind of display devices, including the pixel-driving circuit as described in aforementioned.
The embodiment of the invention also provides a kind of display devices, including multiple pixels and multiple pixel-driving circuits, often
A pixel-driving circuit one pixel operation of corresponding driving, wherein the structure of pixel-driving circuit is for example aforementioned described.The present invention is real
The display device for applying example offer is stored by being provided with the voltage for shunting with luminescent device in pixel-driving circuit
Module, when the drive module in driving circuit generates driving current, driving current charges to voltage memory module, that is,
Driving current charges to voltage memory module, and when charging originates, the anode voltage of luminescent device does not reach luminescent device
Cut-in voltage, luminescent device does not shine, after voltage memory module is filled certain electricity, luminescent device shine, therefore, this
The display device of inventive embodiments is actually to extend luminescent device non-luminous time, thereby reduces being averaged for zero grayscale
Electric current increases the contrast of display screen so that brightness of the display screen in black picture reduces.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, made any modification, equivalent replacement etc. be should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of pixel-driving circuit characterized by comprising
Light emitting module is driven, one end of the driving light emitting module receives supply voltage；
Luminescent device is electrically connected with the driving light emitting module, and the luminescent device is under the driving of the driving light emitting module
It shines；And
Voltage memory module, the voltage memory module drive the luminescent device to shine for shunting the driving light emitting module
When the driving current that generates.
2. pixel-driving circuit according to claim 1, which is characterized in that one end of the voltage memory module with it is described
The anode of luminescent device is electrically connected, and the other end of the voltage memory module is electrically connected with power output end.
3. pixel-driving circuit according to claim 1, which is characterized in that the pixel-driving circuit further comprises:
Initialization module, the initialization module receive the first scanning signal, and the initialization module is according to first scanning
Whether the anode that signal controls the luminescent device connect with the output end of initialization power supply；
Wherein, one end of the voltage memory module is electrically connected with the anode of the luminescent device, the voltage memory module
The other end is electrically connected with the initialization power output end.
4. pixel-driving circuit according to claim 1-3, which is characterized in that the voltage memory module includes
First capacitor.
5. pixel-driving circuit according to claim 4, which is characterized in that the pixel-driving circuit further comprises:
Data memory module, for storing data signal voltage；And
Data storage control module, for receiving the second scanning signal, the data storage control module is swept according to described second
It retouches signal and controls whether the voltage data signal is stored in the data memory module.
6. pixel-driving circuit according to claim 5, which is characterized in that the data storage control module includes at least
One thin film transistor (TFT).
7. pixel-driving circuit according to claim 4, which is characterized in that the pixel-driving circuit further comprises:
The light emitting control module being connected between power output end and the anode of the luminescent device, the light emitting control module connect
Receive and dispatch optical control signal, the light emitting control module according to the LED control signal control the power output end whether with institute
State the anode connection of luminescent device.
8. pixel-driving circuit according to claim 1, which is characterized in that further comprise:
Initialization module, data memory module, data storage control module and light emitting control module, in which:
The driving light emitting module includes driving transistor, and the source electrode of the driving transistor and the output end of the power supply connect
It connects；
The data memory module includes the second capacitor, and the output end of one end of second capacitor and power supply connects, and described the
The other end of two capacitors is connect with the grid of the driving transistor；
The data storage control module includes first film transistor and the second thin film transistor (TFT), wherein the first film is brilliant
The grid of the grid of body pipe and second thin film transistor (TFT) receives second scanning signal, the first film transistor
Source electrode receives voltage data signal, and the drain electrode of the first film transistor is connect with the source electrode of the driving transistor；
The initialization module includes third thin film transistor (TFT) and the 4th thin film transistor (TFT), wherein the third thin film transistor (TFT)
The grid of grid and the 4th thin film transistor (TFT) receives first scanning signal, the source of the third thin film transistor (TFT)
Pole is connect with one end of second capacitor, and the drain electrode of the third thin film transistor (TFT) receives initialization voltage, and the described 4th is thin
The source electrode of film transistor receives the initialization voltage, the drain electrode of the 4th thin film transistor (TFT) and the anode of the luminescent device
Connection；
The light emitting control module includes the 5th thin film transistor (TFT) and the 6th thin film transistor (TFT), wherein the 5th film crystal
The grid of the grid of pipe and the 6th thin film transistor (TFT) receives LED control signal, the source of the 5th thin film transistor (TFT)
Pole receives supply voltage, and the drain electrode of the 5th thin film transistor (TFT) is connect with the source electrode of the driving transistor, and the described 6th is thin
The drain electrode of film transistor is connect with the drain electrode of the driving transistor, the source electrode and the photophore of the 6th thin film transistor (TFT)
The anode of part connects；
One end of the first capacitor is connect with the anode of the luminescent device, one end of the first capacitor and power output end
Connection is connect with initialization power output end.
9. pixel-driving circuit according to claim 8, which is characterized in that at least one described thin film transistor (TFT) is p-type
Thin film transistor (TFT).
10. a kind of display device characterized by comprising
Multiple pixels；And
Multiple such as described in any item pixel-driving circuits of claim 1-9, wherein each pixel-driving circuit driving is every
A pixel operation.
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