CN205810345U - A kind of image element circuit, organic EL display panel and display device - Google Patents
A kind of image element circuit, organic EL display panel and display device Download PDFInfo
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- CN205810345U CN205810345U CN201620727845.5U CN201620727845U CN205810345U CN 205810345 U CN205810345 U CN 205810345U CN 201620727845 U CN201620727845 U CN 201620727845U CN 205810345 U CN205810345 U CN 205810345U
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Abstract
The utility model discloses a kind of image element circuit, organic EL display panel and display device, including: Data write. module, supply voltage control module, conducting control module, memory module, light emitting control module, driving transistor and luminescent device；Wherein, by above-mentioned five modules and drive the cooperating of transistor, the operating current driving light emission drive transistor device luminous in image element circuit can be made only relevant with the voltage of the voltage of data signal end and initial signal end, and it is unrelated with the voltage of the threshold voltage driving transistor and the first power end, the impact of threshold voltage and the IR Drop operating current on flowing through luminescent device driving transistor can be avoided, so that the operating current of driven for emitting lights device luminescence keeps stable, and then improve the uniformity of viewing area picture brightness in display device.
Description
Technical field
This utility model relates to Display Technique field, particularly to a kind of image element circuit, organic EL display panel
And display device.
Background technology
Organic Light Emitting Diode (Organic Light Emitting Diode, OLED) is the research of current flat faced display
One of the focus in field, compares with liquid crystal display (Liquid Crystal Display, LCD), and OLED display has low
The advantages such as energy consumption, production cost are low, self-luminous, wide viewing angle and fast response time.At present, at mobile phone, panel computer, digital camera
In display field, OLED display has begun to replace traditional LCD display.
Utilize stable Control of Voltage brightness different from LCD, OLED belongs to electric current and drives, and needs stable electric current to control
It is luminous.Due to the reason such as manufacturing process and device aging, the threshold voltage V driving transistor of image element circuit can be madethExist
Inhomogeneities, which results in and flow through the electric current of each OLED and change so that display brightness is uneven, thus affect whole
The display effect of image.And it is relevant, due to IR to driving pipe source electrode i.e. supply voltage owing to flowing through the electric current of each OLED
Drop reason, will also result in the current difference of zones of different, and brightness irregularities phenomenon occurs in the OLED in turn resulting in zones of different.
Utility model content
This utility model embodiment provides a kind of image element circuit, organic EL display panel and display device, in order to
The operating current making driven for emitting lights device luminous keeps stable, improves the uniformity of image display brightness.
This utility model embodiment provides a kind of image element circuit, including: Data write. module, supply voltage control mould
Block, conducting control module, memory module, light emitting control module, driving transistor and luminescent device；Wherein,
First end of described Data write. module is connected with scanning signal end, and the second end is connected with data signal end, and the 3rd
End is connected with primary nodal point；Described Data write. module is used for described data signal end under the control of described scanning signal end
Signal be supplied to described primary nodal point；
First end of described supply voltage control module and the first LED control signal end are connected, the second end and the first power supply
End is connected, and the 3rd end source electrode with secondary nodal point and described driving transistor respectively is connected；Described supply voltage control module is used
Under the control at described first LED control signal end, the signal of described first power end is supplied to described secondary nodal point；
First end of described conducting control module is connected with initial signal end, and the second end is connected with second source end, and the 3rd
End is connected with the grid of described driving transistor, and the 4th end is connected with the drain electrode of described driving transistor；Described conducting controls mould
Block is in diode state for controlling described driving transistor by described initial signal end and described second source end；
First end of described memory module is connected with described primary nodal point, and the second end is connected with described secondary nodal point；Described
Memory module is for being charged or putting under the co-controlling of the signal of the signal of described primary nodal point and described secondary nodal point
Electricity, and the voltage difference between described primary nodal point and described secondary nodal point is kept when described primary nodal point is in floating
Stable；
First end of described light emitting control module and the second LED control signal end are connected, the second end and described primary nodal point
Being connected, the 3rd end is connected with the grid of described driving transistor, and the 4th end is connected with the drain electrode of described driving transistor, the 5th end
Being connected with the first end of described luminescent device, the second end of described luminescent device is connected with described second source end；Described luminescence
Control module is for turning on described primary nodal point and described driving transistor under the control of described second LED control signal end
Grid and turn on the drain electrode of described driving transistor and described luminescent device, to control described in described driving transistor driving
Luminescent device is luminous.
In a kind of possible embodiment, this utility model embodiment provide above-mentioned image element circuit in, described in lead
Logical control module includes: the first conducting controls submodule and the second conducting controls submodule；Wherein,
The first end that described first conducting controls submodule is connected with described scanning signal end, the second end and initial signal end
Being connected, the 3rd end is connected with the grid of described driving transistor；Described first conducting controls submodule at described scanning letter
Under the control of number end the signal of described initial signal end is supplied to the grid of described driving transistor；
The first end that described second conducting controls submodule is connected with described scanning signal end, the second end and described second electricity
Source is connected, and the 3rd end is connected with the drain electrode of described driving transistor；Described second conducting controls submodule for sweeping described
Retouch the drain electrode that under the control of signal end, the signal of described second source end is supplied to described driving transistor.
In a kind of possible embodiment, in the above-mentioned image element circuit that this utility model embodiment provides, described the
One conducting controls submodule and includes: the first switching transistor；Wherein,
The grid of described first switching transistor is connected with described scanning signal end, source electrode and described initial signal end phase
Even, drain electrode is connected with the grid of described driving transistor.
In a kind of possible embodiment, in the above-mentioned image element circuit that this utility model embodiment provides, described the
Two conductings control submodule and include: second switch transistor；Wherein,
The grid of described second switch transistor is connected with described scanning signal end, source electrode and described second source end phase
Even, drain electrode is connected with the drain electrode of described driving transistor.
In a kind of possible embodiment, in the above-mentioned image element circuit that this utility model embodiment provides, described number
Include according to writing module: the 3rd switching transistor；Wherein,
The grid of described 3rd switching transistor is connected with described scanning signal end, source electrode and described data signal end phase
Even, drain electrode is connected with described primary nodal point.
In a kind of possible embodiment, in the above-mentioned image element circuit that this utility model embodiment provides, described electricity
Source voltage control module includes: the 4th switching transistor；Wherein,
The grid of described 4th switching transistor is connected with described first LED control signal end, source electrode and described first electricity
Source is connected, and drain electrode is connected with described secondary nodal point.
In a kind of possible embodiment, in the above-mentioned image element circuit that this utility model embodiment provides, described
Photocontrol module includes: the 5th switching transistor and the 6th switching transistor；Wherein,
The grid of described 5th switching transistor is connected with described second LED control signal end, source electrode and described first segment
Point is connected, and drain electrode is connected with the grid of described driving transistor；
The grid of described 6th switching transistor is connected with described second LED control signal end, and source electrode drives crystalline substance with described
The drain electrode of body pipe is connected, and the drain electrode of described 6th switching transistor is connected with the first end of described luminescent device.
In a kind of possible embodiment, this utility model embodiment provide above-mentioned image element circuit in, described in deposit
Storage module includes: electric capacity；Wherein,
First end of described electric capacity is connected with described primary nodal point, and the second end is connected with described secondary nodal point.
In a kind of possible embodiment, this utility model embodiment provide above-mentioned image element circuit in, described in drive
Dynamic transistor is P-type transistor.
In a kind of possible embodiment, in the above-mentioned image element circuit that this utility model embodiment provides, all open
Close transistor and be P-type transistor.
Correspondingly, this utility model embodiment additionally provides a kind of organic EL display panel, new including this practicality
Any of the above-described kind of image element circuit that type embodiment provides.
Correspondingly, this utility model embodiment additionally provides a kind of display device, provides including this utility model embodiment
Any of the above-described kind of organic EL display panel.
Image element circuit, organic EL display panel and the display device that this utility model embodiment provides, including: number
According to writing module, supply voltage control module, conducting control module, memory module, light emitting control module, drive transistor and
Luminescent device；Wherein, Data write. module for being supplied to the under the control of scanning signal end by the signal of data signal end
One node；Supply voltage control module is for providing the signal of the first power end under the control of the first LED control signal end
To secondary nodal point；Conducting control module is for controlling to drive transistor to be in diode by initial signal end and second source end
State；Memory module for being charged under the co-controlling of the signal of the signal of primary nodal point and secondary nodal point or discharging,
And keep the voltage difference between primary nodal point and secondary nodal point stable when primary nodal point is in floating；Light emitting control mould
Block is for turning on primary nodal point and driving the grid of transistor and conducting to drive under the control of the second LED control signal end
The drain electrode of transistor and luminescent device, to control to drive light emission drive transistor device luminous.This utility model embodiment provides
Image element circuit, organic EL display panel and display device, by above-mentioned five modules and drive transistor phase
Coordinate mutually, can make in image element circuit drive the luminous operating current of light emission drive transistor device only with data signal end
Voltage is relevant with the voltage of initial signal end, and unrelated with the voltage of the threshold voltage driving transistor and the first power end, can
To avoid the impact of threshold voltage and the IR Drop operating current on flowing through luminescent device driving transistor, so that driving
The operating current of luminescent device luminescence keeps stable, and then improves the uniformity of viewing area picture brightness in display device.
Accompanying drawing explanation
One of structural representation of image element circuit that Fig. 1 a provides for this utility model embodiment；
The two of the structural representation of the image element circuit that Fig. 1 b provides for this utility model embodiment；
One of concrete structure schematic diagram of image element circuit that Fig. 2 a provides for this utility model embodiment；
The two of the concrete structure schematic diagram of the image element circuit that Fig. 2 b provides for this utility model embodiment；
The three of the concrete structure schematic diagram of the image element circuit that Fig. 2 c provides for this utility model embodiment；
The four of the concrete structure schematic diagram of the image element circuit that Fig. 2 d provides for this utility model embodiment；
Fig. 3 a is the circuit timing diagram of the image element circuit shown in Fig. 2 a；
Fig. 3 b is the circuit timing diagram of the image element circuit shown in Fig. 2 b；
The flow chart of the driving method of the image element circuit that Fig. 4 provides for this utility model embodiment.
Detailed description of the invention
In order to make the purpose of this utility model, technical scheme and advantage are clearer, below in conjunction with the accompanying drawings, new to this practicality
The detailed description of the invention of image element circuit, organic EL display panel and display device that type embodiment provides is carried out in detail
Explanation.
A kind of image element circuit that this utility model embodiment provides, as shown in Figure 1a, including: Data write. module 1, power supply
Voltage control module 2, conducting control module 3, memory module 4, light emitting control module 5, driving transistor M0 and luminescent device
L；Wherein,
First end of Data write. module 1 is connected with scanning signal end Scan, and the second end is connected with data signal end Data,
3rd end is connected with primary nodal point A；Data write. module 1 is used for data signal end under the control of scanning signal end Scan
The signal of Data is supplied to primary nodal point A；
First end of supply voltage control module 2 and the first LED control signal end EM1 are connected, the second end and the first power supply
End VDD be connected, the 3rd end respectively with secondary nodal point B and driving transistor M0 source S be connected；Supply voltage control module 2 is used
Under the control at the first LED control signal end EM1, the signal of the first power end VDD is supplied to secondary nodal point B；
First end of conducting control module 3 is connected with initial signal end Int, and the second end is connected with second source end VEE, the
Three ends are connected with the grid G driving transistor M0, and the 4th end is connected with the drain D driving transistor M0；Conducting control module 3 is used
In controlling to drive transistor M0 to be in diode state by initial signal end Int and second source end VEE；
First end of memory module 4 is connected with primary nodal point A, and the second end is connected with secondary nodal point B；Memory module 4 is used for
It is charged under the co-controlling of the signal of primary nodal point A and the signal of secondary nodal point B or discharges, and at primary nodal point A
Keep the voltage difference between primary nodal point A and secondary nodal point B stable when being in floating；
First end of light emitting control module 5 and the second LED control signal end EM2 are connected, the second end and primary nodal point A phase
Even, the 3rd end is connected with the grid G driving transistor M0, and the 4th end is connected with the drain D driving transistor M0, the 5th end and
First end of optical device L is connected, and second end of luminescent device L is connected with second source end VEE；Light emitting control module 5 is used for
Second LED control signal end EM2 controls lower conducting primary nodal point A and drives the grid G of transistor M0 and conducting to drive crystalline substance
The drain D of body pipe M0 and luminescent device L, to control to drive transistor M0 driven for emitting lights device L luminous.
The above-mentioned image element circuit that this utility model embodiment provides, including: Data write. module, supply voltage control mould
Block, conducting control module, memory module, light emitting control module, driving transistor and luminescent device；Wherein, data write mould
Block is for being supplied to primary nodal point by the signal of data signal end under the control of scanning signal end；Supply voltage control module is used
Under the control at the first LED control signal end, the signal of the first power end is supplied to secondary nodal point；Conducting control module is used
In controlling to drive transistor to be in diode state by initial signal end and second source end；Memory module is at first segment
It is charged under the co-controlling of the signal of point and the signal of secondary nodal point or discharges, and being in floating at primary nodal point
Time keep the voltage difference between primary nodal point and secondary nodal point stable；Light emitting control module is at the second LED control signal end
Control lower conducting primary nodal point and drive the grid of transistor and conducting to drive drain electrode and the luminescent device of transistor, with control
System drives light emission drive transistor device luminous.This utility model embodiment provide image element circuit by above-mentioned five modules with
And drive cooperating of transistor, the operating current driving the luminescence of light emission drive transistor device in image element circuit can be made
Only relevant with the voltage of the voltage of data signal end and initial signal end, and with drive the threshold voltage of transistor and the first power supply
The voltage of end is unrelated, can avoid the threshold voltage and the IR Drop that the drive transistor operating current to flowing through luminescent device
Impact, so that the operating current of driven for emitting lights device luminescence keeps stable, and then improves viewing area picture in display device
The uniformity of brightness.
In the specific implementation, in the above-mentioned image element circuit that this utility model embodiment provides, as shown in Figure 1a, crystalline substance is driven
Body pipe M0 is P-type transistor.Threshold voltage V due to P-type transistorthGenerally negative value, in order to ensure to drive transistor M0 energy
Normal work, the voltage V of the first corresponding power endddGenerally on the occasion of, the voltage V of second source endeeTypically grounded or be negative
Value.
In the specific implementation, in the above-mentioned image element circuit that this utility model embodiment provides, the voltage of the first power end
VddIt is all higher than the voltage V of second source endeeAnd the voltage V of initial signal endInt.And the voltage V of the first power endddWith just
The voltage V of beginning signal endIntNeed to meet formula: Vdd>VInt-Vth。
In the specific implementation, in the above-mentioned image element circuit that this utility model embodiment provides, luminescent device generally has
Organic electro luminescent diode, realizes luminescence under the effect of its electric current when driving transistor to be in saturation.
In the specific implementation, in the above-mentioned image element circuit that this utility model embodiment provides, as shown in Figure 1 b, conducting control
Molding block 3 specifically may include that the first conducting controls submodule 31 and the second conducting controls submodule 32；Wherein,
First conducting controls the first end of submodule 31 and is connected with scanning signal end Scan, the second end and initial signal end
Int is connected, and the 3rd end is connected with the grid G driving transistor M0；First conducting controls submodule 31 at scanning signal end
The signal of initial signal end Int is supplied under the control of Scan drive the grid G of transistor M0；
Second conducting controls the first end of submodule 32 and is connected with scanning signal end Scan, the second end and second source end
VEE is connected, and the 3rd end is connected with the drain D driving transistor M0；Second conducting controls submodule 32 at scanning signal end
The signal of second source end VEE is supplied under the control of Scan drive the drain D of transistor M0.
Below in conjunction with specific embodiment, this utility model is described in detail.It should be noted that the present embodiment is only
In order to preferably explain this utility model, but it is not intended to this utility model.
Specifically, in the specific implementation, in the above-mentioned image element circuit that this utility model embodiment provides, if Fig. 2 a is to figure
Shown in 2d, the first conducting controls submodule 31 and specifically may include that the first switching transistor M1；Wherein,
The grid of the first switching transistor M1 is connected with scanning signal end Scan, and source electrode is connected with initial signal end Int, leakage
Pole is connected with the grid G driving transistor M0.
In the specific implementation, in the above-mentioned image element circuit that this utility model embodiment provides, as shown in Fig. 2 a and Fig. 2 c,
First switching transistor M1 can be p-type switching transistor；Or, as shown in Fig. 2 b and Fig. 2 d, the first switching transistor M1 is also
Can be N-type switching transistor, in this no limit.
In the specific implementation, in the above-mentioned image element circuit that this utility model embodiment provides, the first switching transistor exists
When scanning in the conduction state under the control of signal end, the signal of initial signal end is supplied to drive the grid of transistor.
More than it is merely illustrative of the first conducting in the image element circuit that this utility model embodiment provides and controls submodule
Concrete structure, in the specific implementation, the first conducting controls the concrete structure of submodule and is not limited to the offer of this utility model embodiment
Said structure, it is also possible to be other structures that skilled person will appreciate that, in this no limit.
Specifically, in the specific implementation, in the above-mentioned image element circuit that this utility model embodiment provides, if Fig. 2 a is to figure
Shown in 2d, the second conducting controls submodule 32 and specifically may include that second switch transistor M2；Wherein,
The grid of second switch transistor M2 is connected with scanning signal end Scan, and source electrode is connected with second source end VEE, leakage
Pole is connected with the drain D driving transistor M0.
In the specific implementation, in the above-mentioned image element circuit that this utility model embodiment provides, as shown in Fig. 2 a and Fig. 2 c,
Second switch transistor M2 can be p-type switching transistor；Or, as shown in Fig. 2 b and Fig. 2 d, second switch transistor M2 is also
Can be N-type switching transistor, in this no limit.
In the specific implementation, in the above-mentioned image element circuit that this utility model embodiment provides, second switch transistor exists
When scanning in the conduction state under the control of signal end, the signal of second source end is supplied to drive the drain electrode of transistor.
More than it is merely illustrative of the second conducting in the image element circuit that this utility model embodiment provides and controls submodule
Concrete structure, in the specific implementation, the second conducting controls the concrete structure of submodule and is not limited to the offer of this utility model embodiment
Said structure, it is also possible to be other structures that skilled person will appreciate that, in this no limit.
Specifically, in the specific implementation, in the above-mentioned image element circuit that this utility model embodiment provides, if Fig. 2 a is to figure
Shown in 2d, Data write. module 1 specifically may include that the 3rd switching transistor M3；Wherein,
The grid of the 3rd switching transistor M3 is connected with scanning signal end Scan, and source electrode is connected with data signal end Data,
Drain electrode is connected with primary nodal point A.
In the specific implementation, in the above-mentioned image element circuit that this utility model embodiment provides, as shown in Fig. 2 a and Fig. 2 c,
3rd switching transistor M3 can be p-type switching transistor；Or, as shown in Fig. 2 b and Fig. 2 d, the 3rd switching transistor M3 is also
Can be N-type switching transistor, in this no limit.
In the specific implementation, in the above-mentioned image element circuit that this utility model embodiment provides, the 3rd switching transistor exists
When scanning in the conduction state under the control of signal end, the signal of data signal end is supplied to primary nodal point.
More than it is merely illustrative of the concrete knot of Data write. module in the image element circuit that this utility model embodiment provides
Structure, in the specific implementation, the concrete structure of Data write. module is not limited to the said structure that this utility model embodiment provides, also
Can be other structures that skilled person will appreciate that, in this no limit.
Specifically, in the specific implementation, in the above-mentioned image element circuit that this utility model embodiment provides, if Fig. 2 a is to figure
Shown in 2d, supply voltage control module 2 specifically may include that the 4th switching transistor M4；Wherein,
The grid of the 4th switching transistor M4 and the first LED control signal end EM1 are connected, source electrode and the first power end VDD
Being connected, drain electrode is connected with secondary nodal point B.
In the specific implementation, in the above-mentioned image element circuit that this utility model embodiment provides, as shown in Fig. 2 a and Fig. 2 d,
4th switching transistor M4 can be p-type switching transistor；Or, as shown in Fig. 2 b and Fig. 2 c, the 4th switching transistor M4 is also
Can be N-type switching transistor, in this no limit.
In the specific implementation, in the above-mentioned image element circuit that this utility model embodiment provides, the 4th switching transistor exists
Under the control of the first LED control signal end in the conduction state time, the signal of the first power end is supplied to secondary nodal point.
More than it is merely illustrative of the tool of supply voltage control module in the image element circuit that this utility model embodiment provides
Body structure, in the specific implementation, the concrete structure of supply voltage control module is not limited to the upper of this utility model embodiment offer
State structure, it is also possible to be other structures that skilled person will appreciate that, in this no limit.
Specifically, in the specific implementation, in the above-mentioned image element circuit that this utility model embodiment provides, if Fig. 2 a is to figure
Shown in 2d, light emitting control module 5 specifically may include that the 5th switching transistor M5 and the 6th switching transistor M6；Wherein,
The grid of the 5th switching transistor M5 and the second LED control signal end EM2 are connected, source electrode and primary nodal point A phase
Even, drain and be connected with the grid G driving transistor M0；
The grid of the 6th switching transistor M6 and the second LED control signal end EM2 are connected, source electrode and driving transistor M0
Drain D be connected, the drain electrode of the 6th switching transistor M6 is connected with first end of luminescent device L.
In the specific implementation, in the above-mentioned image element circuit that this utility model embodiment provides, as shown in Fig. 2 a and Fig. 2 d,
5th switching transistor M5 and the 6th switching transistor M6 can be p-type switching transistor；Or, as shown in Fig. 2 b and Fig. 2 c,
5th switching transistor M5 and the 6th switching transistor M6 can also be N-type switching transistor, in this no limit.
In the specific implementation, in the above-mentioned image element circuit that this utility model embodiment provides, the 5th switching transistor exists
Under the control of the second LED control signal end in the conduction state time, conducting primary nodal point and secondary nodal point, with by primary nodal point
Signal be supplied to secondary nodal point so that major general drive the threshold voltage of transistor and the voltage of the first power end be supplied to drive
The grid of transistor；When 6th switching transistor is in the conduction state under the control of the second LED control signal end, conducting is driven
The drain electrode of dynamic transistor and luminescent device, to control to drive light emission drive transistor device luminous.
More than it is merely illustrative of the concrete knot of light emitting control module in the image element circuit that this utility model embodiment provides
Structure, in the specific implementation, the concrete structure of light emitting control module is not limited to the said structure that this utility model embodiment provides, also
Can be other structures that skilled person will appreciate that, in this no limit.
Specifically, in the specific implementation, in the above-mentioned image element circuit that this utility model embodiment provides, if Fig. 2 a is to figure
Shown in 2d, memory module 4 specifically may include that electric capacity C；Wherein,
First end of electric capacity C is connected with primary nodal point A, and the second end is connected with secondary nodal point C.
In the specific implementation, in the above-mentioned image element circuit that this utility model embodiment provides, electric capacity is at primary nodal point
It is charged under the co-controlling of the signal of signal and secondary nodal point；And at the signal of the signal of primary nodal point and secondary nodal point
Discharge under co-controlling；And when primary nodal point is in floating, keep between primary nodal point and secondary nodal point
Voltage difference is stable, with the threshold voltage V by driving transistorthVoltage V with the first power endddIt is stored in primary nodal point.
More than it is merely illustrative of the concrete structure of memory module in the image element circuit that this utility model embodiment provides,
When being embodied as, the concrete structure of memory module is not limited to the said structure that this utility model embodiment provides, it is also possible to be this
Skilled person's other structures knowable, in this no limit.
Further, in the specific implementation, in the above-mentioned image element circuit that this utility model embodiment provides, such as Fig. 2 a institute
Showing, all of switching transistor can be P-type transistor, or as shown in Figure 2 b, all of switching transistor can be N-type
Transistor, in this no limit.
It is preferred that be P-type transistor owing to driving transistor M0, in the specific implementation, carry in this utility model embodiment
In the above-mentioned image element circuit of confession, as shown in Figure 2 a, all switching transistors are P-type transistor.So can simplify image element circuit
Fabrication processing.
In the specific implementation, in the above-mentioned image element circuit that this utility model embodiment provides, p-type switching transistor is at height
End under current potential effect, turn under electronegative potential effect；N-type switching transistor turns under high potential effect, makees at electronegative potential
Use lower cut-off.
It should be noted that in the above-mentioned image element circuit that this utility model embodiment provides, drive transistor and switch
Transistor can be thin film transistor (TFT) (TFT, Thin Film Transistor), it is also possible to be metal oxide semiconductcor field effect
Should manage (MOS, Metal Oxide Scmiconductor), in this no limit.In the specific implementation, these switching transistors
Source electrode and drain electrode according to switching transistor type and the difference of the signal of signal end, its function can be exchanged, not done at this
Concrete differentiation.When describing specific embodiment, it is all to carry out as a example by driving transistor and switching transistor as thin film transistor (TFT)
Illustrate.
Below as a example by the image element circuit shown in Fig. 2 a and Fig. 2 b, this utility model embodiment is carried by combined circuit sequential chart
The work process of the above-mentioned image element circuit of confession is described.Representing high potential with 1 in described below, 0 represents electronegative potential.Need
Bright, 1 and 0 is logic level, and it is merely to preferably explain the specific works process of this utility model embodiment, and not
It it is the current potential being applied on the grid of each switching transistor in the specific implementation.
Embodiment one,
As shown in Figure 2 a, driving transistor M0 is P-type transistor, and all switching transistors are P-type transistor；Each switch
Transistor ends under high level effect, turns under low level effect；Corresponding input timing figure is as shown in Figure 3 a.Specifically
Ground, chooses T1, T2, T3 and T4 four-stage in input timing figure as shown in Figure 3 a.
At T1 stage, Scan=0, EM1=0, EM2=1.
Due to Scan=0, therefore the first switching transistor M1, second switch transistor M2 and the 3rd switching transistor M3 are equal
Conducting；Due to EM1=0, therefore the 4th switching transistor M4 conducting；Due to EM2=1, therefore the 5th switching transistor M5 and
Six switching transistors M6 are turned off.3rd switching transistor M3 of conducting is by the voltage V of data signal end DataDataIt is supplied to
First end of one node A, i.e. electric capacity C, therefore the voltage of first end of electric capacity C is VData；4th switching transistor M4 of conducting
Voltage V by the first power end VDDddIt is supplied to secondary nodal point B, i.e. drives the source S of transistor M0 and second end of electric capacity C,
Therefore the voltage of second end of electric capacity C is Vdd；First switching transistor M1 of conducting is by the voltage V of initial signal end IntIntCarry
Supply drives the grid G of transistor M0；The second switch transistor M2 of conducting is by the voltage V of second source end VEEeeIt is supplied to drive
The drain D of dynamic transistor M0, to control to drive transistor M0 to be in diode state, to control to drive transistor M0 to have from it
Source electrode flows to the stabling current of its drain electrode.But due to the 6th switching transistor M6 cut-off, therefore luminescent device L is the most luminous.
At T2 stage, Scan=0, EM1=1, EM2=1.
Due to Scan=0, therefore the first switching transistor M1, second switch transistor M2 and the 3rd switching transistor M3 are equal
Conducting；Due to EM2=1, therefore the 5th switching transistor M5 and the 6th switching transistor M6 are turned off；Due to EM1=1, therefore
4th switching transistor M4 cut-off.3rd switching transistor M3 of conducting is by the voltage V of data signal end DataDataIt is supplied to
First end of one node A, i.e. electric capacity C, therefore the voltage of first end of electric capacity C is VData；4th switching transistor M4 of cut-off
Making the first power end VDD and secondary nodal point B disconnect, therefore secondary nodal point B is in floating；First switching transistor of conducting
M1 is by the voltage V of initial signal end IntIntIt is supplied to drive the grid G of transistor M0；The second switch transistor M2 of conducting will
The voltage V of second source end VEEeeIt is supplied to the drain D driving transistor M0 to control to drive transistor M0 to be in diode-like
State, owing to driving the gate source voltage of transistor M0 more than its threshold voltage VthDriving transistor M0 is made to open；Owing to driving crystal
Pipe M0 is in diode state, and therefore electric capacity C is by driving transistor M0 to discharge, until the voltage of secondary nodal point B, i.e. electricity
The voltage of the second end held becomes: VInt-Vth, driving transistor M0 cut-off, electric capacity C stops electric discharge, the therefore voltage at electric capacity two ends
Difference is: VData-VInt+Vth。
In the T3 stage, the front time period, Scan=1, EM1=1, EM2=1.
Due to Scan=1, therefore the first switching transistor M1, second switch transistor M2 and the 3rd switching transistor M3 are equal
Cut-off；Due to EM1=1, therefore the 4th switching transistor M4 cut-off；Due to EM2=1, therefore the 5th switching transistor M5 and
Six switching transistors M6 are turned off.
The rear time period, Scan=1, EM1=0, EM2=1.Due to Scan=1, therefore the first switching transistor M1, second
Switching transistor M2 and the 3rd switching transistor M3 are turned off；Due to EM2=1, therefore the 5th switching transistor M5 and the 6th is opened
Close transistor M6 to be turned off；Due to EM1=0, therefore the 4th switching transistor M4 conducting.4th switching transistor M4 of conducting will
The voltage V of the first power end VDDddIt is supplied to secondary nodal point B, the therefore voltage of the second end of the voltage of secondary nodal point B, i.e. electric capacity
For Vdd.3rd switching transistor M3 of cut-off makes data signal end Data disconnect with primary nodal point A, and therefore primary nodal point A is in
Floating；Owing to primary nodal point A is in floating, according to Capacitance Coupled principle, for the voltage difference at holding capacitor two ends
It is still: VData-VInt+Vth, therefore the voltage of first end of electric capacity C is by VDataSaltus step is VData+Vdd-VInt+Vth。
At T4 stage, Scan=1, EM1=0, EM2=0.
Due to Scan=1, therefore the first switching transistor M1, second switch transistor M2 and the 3rd switching transistor M3 are equal
Cut-off；Due to EM2=0, therefore the 5th switching transistor M5 and the 6th switching transistor M6 are both turned on；Due to EM1=0, therefore
4th switching transistor M4 conducting.5th switching transistor M5 of conducting is by the voltage of primary nodal point A, the i.e. electricity of electric capacity the first end
Pressure VData+Vdd-VInt+VthBeing supplied to secondary nodal point B, the voltage therefore driving the grid G of transistor M0 is VData+Vdd-VInt+
Vth；4th switching transistor M4 of conducting is by the voltage V of the first power end VDDddIt is supplied to secondary nodal point B, therefore drives crystal
The voltage of the source S of pipe M0 is Vdd；Owing to driving transistor M0 to be in saturation, according to saturation current characteristics,
Flow through the operating current I driving transistor M0LMeet formula: IL=K (VGS-Vth)2=K [(VData+Vdd-VInt+Vth-Vdd)-
Vth]2=K (VData-VInt)2, wherein, VGSFor driving the gate source voltage of transistor M0；K is structural parameters, this number in identical structure
It is worth the most stable, constant can be can be regarded as.By above formula, electric current when driving transistor M0 to be in saturation only with initially
The voltage V of signal end IntIntVoltage V with data signal end DataDataRelevant, and with drive the threshold voltage V of transistor M0th
Voltage V with the first power end VDDddUnrelated, thoroughly solve the manufacturing process and for a long time owing to driving transistor M0
The threshold voltage V that operation causesthDrift, and the impact of the electric current that IR Drop is on flowing through luminescent device, so that luminescent device
The operating current of L keeps stable, and then ensure that the normal work of luminescent device L.
Embodiment two,
As shown in Figure 2 b, driving transistor M0 is P-type transistor, and all switching transistors are N-type switching transistor；Respectively
Switching transistor turns under high level effect, ends under low level effect；Corresponding input timing figure is as shown in Figure 3 b.Tool
Body ground, chooses T1, T2, T3 and T4 four-stage in input timing figure as shown in Figure 3 b.
At T1 stage, Scan=1, EM1=1, EM2=0.
Due to Scan=1, therefore the first switching transistor M1, second switch transistor M2 and the 3rd switching transistor M3 are equal
Conducting；Due to EM1=1, therefore the 4th switching transistor M4 conducting；Due to EM2=0, therefore the 5th switching transistor M5 and
Six switching transistors M6 are turned off.3rd switching transistor M3 of conducting is by the voltage V of data signal end DataDataIt is supplied to
First end of one node A, i.e. electric capacity C, therefore the voltage of first end of electric capacity C is VData；4th switching transistor M4 of conducting
Voltage V by the first power end VDDddIt is supplied to secondary nodal point B, i.e. drives the source S of transistor M0 and second end of electric capacity C,
Therefore the voltage of second end of electric capacity C is Vdd；First switching transistor M1 of conducting is by the voltage V of initial signal end IntIntCarry
Supply drives the grid G of transistor M0；The second switch transistor M2 of conducting is by the voltage V of second source end VEEeeIt is supplied to drive
The drain D of dynamic transistor M0, to control to drive transistor M0 to be in diode state, to control to drive transistor M0 to have from it
Source electrode flows to the stabling current of its drain electrode.But due to the 6th switching transistor M6 cut-off, therefore luminescent device L is the most luminous.
At T2 stage, Scan=1, EM1=0, EM2=0.
Due to Scan=1, therefore the first switching transistor M1, second switch transistor M2 and the 3rd switching transistor M3 are equal
Conducting；Due to EM2=0, therefore the 5th switching transistor M5 and the 6th switching transistor M6 are turned off；Due to EM1=0, therefore
4th switching transistor M4 cut-off.3rd switching transistor M3 of conducting is by the voltage V of data signal end DataDataIt is supplied to
First end of one node A, i.e. electric capacity C, therefore the voltage of first end of electric capacity C is VData；4th switching transistor M4 of cut-off
Making the first power end VDD and secondary nodal point B disconnect, therefore secondary nodal point B is in floating；First switching transistor of conducting
M1 is by the voltage V of initial signal end IntIntIt is supplied to drive the grid G of transistor M0；The second switch transistor M2 of conducting will
The voltage V of second source end VEEeeIt is supplied to the drain D driving transistor M0 to control to drive transistor M0 to be in diode-like
State, owing to driving the gate source voltage of transistor M0 more than its threshold voltage VthDriving transistor M0 is made to open；Owing to driving crystal
Pipe M0 is in diode state, and therefore electric capacity C is by driving transistor M0 to discharge, until the voltage of secondary nodal point B, i.e. electricity
The voltage of the second end held becomes: VInt-Vth, driving transistor M0 cut-off, electric capacity C stops electric discharge, the therefore voltage at electric capacity two ends
Difference is: VData-VInt+Vth。
In the T3 stage, the front time period, Scan=0, EM1=0, EM2=0.
Due to Scan=0, therefore the first switching transistor M1, second switch transistor M2 and the 3rd switching transistor M3 are equal
Cut-off；Due to EM1=0, therefore the 4th switching transistor M4 cut-off；Due to EM2=0, therefore the 5th switching transistor M5 and
Six switching transistors M6 are turned off.
The rear time period, Scan=0, EM1=1, EM2=0.
Due to Scan=0, therefore the first switching transistor M1, second switch transistor M2 and the 3rd switching transistor M3 are equal
Cut-off；Due to EM2=0, therefore the 5th switching transistor M5 and the 6th switching transistor M6 are turned off；Due to EM1=1, therefore
4th switching transistor M4 conducting.4th switching transistor M4 of conducting is by the voltage V of the first power end VDDddIt is supplied to second
Node B, therefore the voltage of the second end of the voltage of secondary nodal point B, i.e. electric capacity is Vdd.3rd switching transistor M3 of cut-off makes number
Disconnecting according to signal end Data and primary nodal point A, therefore primary nodal point A is in floating；Owing to primary nodal point A is in suspension joint shape
State, according to Capacitance Coupled principle, in order to the voltage difference at holding capacitor two ends is still: VData-VInt+Vth, therefore the first of electric capacity C
The voltage of end is by VDataSaltus step is VData+Vdd-VInt+Vth。
At T4 stage, Scan=0, EM1=1, EM2=1.
Due to Scan=0, therefore the first switching transistor M1, second switch transistor M2 and the 3rd switching transistor M3 are equal
Cut-off；Due to EM2=1, therefore the 5th switching transistor M5 and the 6th switching transistor M6 are both turned on；Due to EM1=1, therefore
4th switching transistor M4 conducting.5th switching transistor M5 of conducting is by the voltage of primary nodal point A, the i.e. electricity of electric capacity the first end
Pressure VData+Vdd-VInt+VthBeing supplied to secondary nodal point B, the voltage therefore driving the grid G of transistor M0 is VData+Vdd-VInt+
Vth；4th switching transistor M4 of conducting is by the voltage V of the first power end VDDddIt is supplied to secondary nodal point B, therefore drives crystal
The voltage of the source S of pipe M0 is Vdd；Owing to driving transistor M0 to be in saturation, according to saturation current characteristics,
Flow through the operating current I driving transistor M0LMeet formula: IL=K (VGS-Vth)2=K [(VData+Vdd-VInt+Vth-Vdd)-
Vth]2=K (VData-VInt)2, wherein, VGSFor driving the gate source voltage of transistor M0；K is structural parameters, this number in identical structure
It is worth the most stable, constant can be can be regarded as.By above formula, electric current when driving transistor M0 to be in saturation only with initially
The voltage V of signal end IntIntVoltage V with data signal end DataDataRelevant, and with drive the threshold voltage V of transistor M0th
Voltage V with the first power end VDDddUnrelated, thoroughly solve the manufacturing process and for a long time owing to driving transistor M0
The threshold voltage V that operation causesthDrift, and the impact of the electric current that IR Drop is on flowing through luminescent device, so that luminescent device
The operating current of L keeps stable, and then ensure that the normal work of luminescent device L.
In this utility model embodiment one and embodiment two, owing in the T1 stage, having a stable electric current and passing through
Drive transistor, it is to avoid the generation of hesitation, improve the response time driving transistor, and to reduce dark-state bright
Degree.
Conceiving based on same utility model, this utility model embodiment additionally provides a kind of this utility model embodiment and provides
The driving method of any of the above-described kind of image element circuit, as shown in Figure 4, including first stage, second stage, phase III and
Four stages；Wherein,
S401, in the first stage, Data write. module scanning signal end control under the signal of data signal end is carried
Supply primary nodal point；The signal of the first power end is carried under the control of the first LED control signal end by supply voltage control module
Supply secondary nodal point；Memory module is charged under the co-controlling of the signal of primary nodal point and the signal of secondary nodal point；Lead
Logical control module controls to drive transistor to be in diode state by initial signal end and second source end；
S402, in second stage, the signal of data signal end is carried under the control of scanning signal end by Data write. module
Supply primary nodal point；Conducting control module controls to drive transistor to be in diode-like by initial signal end and second source end
State；Memory module is discharged under the co-controlling of the signal of primary nodal point and the signal of secondary nodal point；
S403, in the phase III, supply voltage control module under the control of the first LED control signal end by first electricity
The signal of source is supplied to secondary nodal point；Memory module keeps primary nodal point and second section when primary nodal point is in floating
Voltage difference between point is stable；
S404, in fourth stage, supply voltage control module under the control of the first LED control signal end by first electricity
The signal of source is supplied to secondary nodal point；Light emitting control module turns on primary nodal point under the control of the second LED control signal end
Drain electrode and luminescent device with the grid and conducting driving transistor drives transistor, drives light emission drive transistor with control
Device is luminous.
The above-mentioned driving method that this utility model embodiment provides can make the driving transistor driving in image element circuit send out
The luminous operating current of optical device is only relevant with the voltage of the voltage of data signal end and initial signal end, and with drive transistor
Threshold voltage and the voltage of the first power end unrelated, the threshold voltage driving transistor can be avoided flowing through with IR Drop
The impact of the operating current of luminescent device, so that the operating current of driven for emitting lights device luminescence keeps stable, and then improves aobvious
The uniformity of viewing area picture brightness in showing device.
Conceiving based on same utility model, this utility model embodiment additionally provides a kind of ORGANIC ELECTROLUMINESCENCE DISPLAYS face
Plate, including: any of the above-described kind of image element circuit that this utility model embodiment provides.This organic EL display panel solves to ask
The principle of topic is similar to aforesaid image element circuit, and therefore the enforcement of this organic EL display panel may refer to above-mentioned pixel
The enforcement of circuit, repeats no more in place of repetition.
Conceiving based on same utility model, this utility model embodiment additionally provides a kind of display device, including this practicality
The above-mentioned organic EL display panel that new embodiment provides.This display device can be: mobile phone, panel computer, TV
Any product with display function or the parts such as machine, display, notebook computer, DPF, navigator.For this display
Other requisite ingredient of device is and it will be apparent to an ordinarily skilled person in the art that have, and does not do superfluous at this
State, also should not be used as restriction of the present utility model.The enforcement of this display device may refer to the embodiment of above-mentioned image element circuit,
Repeat no more in place of repetition.
Image element circuit, organic EL display panel and the display device that this utility model embodiment provides, including: number
According to writing module, supply voltage control module, conducting control module, memory module, light emitting control module, drive transistor and
Luminescent device；Wherein, Data write. module for being supplied to the under the control of scanning signal end by the signal of data signal end
One node；Supply voltage control module is for providing the signal of the first power end under the control of the first LED control signal end
To secondary nodal point；Conducting control module is for controlling to drive transistor to be in diode by initial signal end and second source end
State；Memory module for being charged under the co-controlling of the signal of the signal of primary nodal point and secondary nodal point or discharging,
And keep the voltage difference between primary nodal point and secondary nodal point stable when primary nodal point is in floating；Light emitting control mould
Block is for turning on primary nodal point and driving the grid of transistor and conducting to drive under the control of the second LED control signal end
The drain electrode of transistor and luminescent device, to control to drive light emission drive transistor device luminous.This utility model embodiment provides
Image element circuit, organic EL display panel and display device, by above-mentioned five modules and drive transistor phase
Coordinate mutually, can make in image element circuit drive the luminous operating current of light emission drive transistor device only with data signal end
Voltage is relevant with the voltage of initial signal end, and unrelated with the voltage of the threshold voltage driving transistor and the first power end, can
To avoid the impact of threshold voltage and the IR Drop operating current on flowing through luminescent device driving transistor, so that driving
The operating current of luminescent device luminescence keeps stable, and then improves the uniformity of viewing area picture brightness in display device.
Obviously, those skilled in the art can carry out various change and modification without deviating from this practicality to this utility model
Novel spirit and scope.So, if of the present utility model these amendment and modification belong to this utility model claim and
Within the scope of its equivalent technologies, then this utility model is also intended to comprise these change and modification.
Claims (12)
1. an image element circuit, it is characterised in that including: Data write. module, supply voltage control module, conducting control mould
Block, memory module, light emitting control module, driving transistor and luminescent device；Wherein,
First end of described Data write. module with scanning signal end be connected, the second end is connected with data signal end, the 3rd end and
Primary nodal point is connected；Described Data write. module is used for the letter of described data signal end under the control of described scanning signal end
Number it is supplied to described primary nodal point；
First end of described supply voltage control module and the first LED control signal end are connected, the second end and the first power end phase
Even, the 3rd end source electrode with secondary nodal point and described driving transistor respectively is connected；Described supply voltage control module is used for
Under the control of described first LED control signal end, the signal of described first power end is supplied to described secondary nodal point；
First end of described conducting control module is connected with initial signal end, and the second end is connected with second source end, the 3rd end with
The grid of described driving transistor is connected, and the 4th end is connected with the drain electrode of described driving transistor；Described conducting control module is used
It is in diode state in controlling described driving transistor by described initial signal end and described second source end；
First end of described memory module is connected with described primary nodal point, and the second end is connected with described secondary nodal point；Described storage
Module for being charged under the co-controlling of the signal of the signal of described primary nodal point and described secondary nodal point or discharging, with
And keep the voltage difference between described primary nodal point and described secondary nodal point stable when described primary nodal point is in floating；
First end of described light emitting control module and the second LED control signal end are connected, the second end and described primary nodal point phase
Even, the 3rd end is connected with the grid of described driving transistor, and the 4th end is connected with the drain electrode of described driving transistor, the 5th end and
First end of described luminescent device is connected, and the second end of described luminescent device is connected with described second source end；Described luminous control
Molding block is for turning on described primary nodal point and described driving transistor under the control of described second LED control signal end
Grid and turn on the drain electrode of described driving transistor and described luminescent device, to control to send out described in described driving transistor driving
Optical device is luminous.
2. image element circuit as claimed in claim 1, it is characterised in that described conducting control module includes: the first conducting controls
Submodule and the second conducting control submodule；Wherein,
The first end that described first conducting controls submodule is connected with described scanning signal end, the second end and initial signal end phase
Even, the 3rd end is connected with the grid of described driving transistor；Described first conducting controls submodule at described scanning signal
Under the control of end, the signal of described initial signal end is supplied to the grid of described driving transistor；
The first end that described second conducting controls submodule is connected with described scanning signal end, the second end and described second source end
Being connected, the 3rd end is connected with the drain electrode of described driving transistor；Described second conducting controls submodule at described scanning letter
Under the control of number end the signal of described second source end is supplied to the drain electrode of described driving transistor.
3. image element circuit as claimed in claim 2, it is characterised in that described first conducting controls submodule and includes: first opens
Close transistor；Wherein,
The grid of described first switching transistor is connected with described scanning signal end, and source electrode is connected with described initial signal end, leakage
Pole is connected with the grid of described driving transistor.
4. image element circuit as claimed in claim 2, it is characterised in that described second conducting controls submodule and includes: second opens
Close transistor；Wherein,
The grid of described second switch transistor is connected with described scanning signal end, and source electrode is connected with described second source end, leakage
Pole is connected with the drain electrode of described driving transistor.
5. image element circuit as claimed in claim 1, it is characterised in that described Data write. module includes: the 3rd switch crystal
Pipe；Wherein,
The grid of described 3rd switching transistor is connected with described scanning signal end, and source electrode is connected with described data signal end, leakage
Pole is connected with described primary nodal point.
6. image element circuit as claimed in claim 1, it is characterised in that described supply voltage control module includes: the 4th switch
Transistor；Wherein,
The grid of described 4th switching transistor is connected with described first LED control signal end, source electrode and described first power end
Being connected, drain electrode is connected with described secondary nodal point.
7. image element circuit as claimed in claim 1, it is characterised in that described light emitting control module includes: the 5th switch crystal
Pipe and the 6th switching transistor；Wherein,
The grid of described 5th switching transistor is connected with described second LED control signal end, source electrode and described primary nodal point phase
Even, drain electrode is connected with the grid of described driving transistor；
The grid of described 6th switching transistor is connected with described second LED control signal end, source electrode and described driving transistor
Drain electrode be connected, the drain electrode of described 6th switching transistor is connected with the first end of described luminescent device.
8. image element circuit as claimed in claim 1, it is characterised in that described memory module includes: electric capacity；Wherein,
First end of described electric capacity is connected with described primary nodal point, and the second end is connected with described secondary nodal point.
9. the image element circuit as described in any one of claim 1-8, it is characterised in that described driving transistor is P-type transistor.
10. image element circuit as claimed in claim 9, it is characterised in that all switching transistors are P-type transistor.
11. 1 kinds of organic EL display panels, it is characterised in that include the pixel electricity as described in any one of right 1-10
Road.
12. 1 kinds of display devices, it is characterised in that include organic EL display panel as claimed in claim 11.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106205491A (en) * | 2016-07-11 | 2016-12-07 | 京东方科技集团股份有限公司 | A kind of image element circuit, its driving method and relevant apparatus |
| WO2022110247A1 (en) * | 2020-11-30 | 2022-06-02 | 京东方科技集团股份有限公司 | Drive circuit, driving method thereof, and display device |
| CN114783370A (en) * | 2022-05-05 | 2022-07-22 | 武汉天马微电子有限公司 | Pixel circuit, display panel and display device |
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2016
- 2016-07-11 CN CN201620727845.5U patent/CN205810345U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106205491A (en) * | 2016-07-11 | 2016-12-07 | 京东方科技集团股份有限公司 | A kind of image element circuit, its driving method and relevant apparatus |
| WO2018010511A1 (en) * | 2016-07-11 | 2018-01-18 | Boe Technology Group Co., Ltd. | Electronic circuit and driving method, display panel, and display apparatus |
| CN106205491B (en) * | 2016-07-11 | 2018-09-11 | 京东方科技集团股份有限公司 | A kind of pixel circuit, its driving method and relevant apparatus |
| WO2022110247A1 (en) * | 2020-11-30 | 2022-06-02 | 京东方科技集团股份有限公司 | Drive circuit, driving method thereof, and display device |
| CN114783370A (en) * | 2022-05-05 | 2022-07-22 | 武汉天马微电子有限公司 | Pixel circuit, display panel and display device |
| CN114783370B (en) * | 2022-05-05 | 2023-10-20 | 武汉天马微电子有限公司 | Pixel circuit, display panel and display device |
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