CN105895017B - Pixel-driving circuit, driving method, display panel and device - Google Patents
Pixel-driving circuit, driving method, display panel and device Download PDFInfo
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- CN105895017B CN105895017B CN201610404997.6A CN201610404997A CN105895017B CN 105895017 B CN105895017 B CN 105895017B CN 201610404997 A CN201610404997 A CN 201610404997A CN 105895017 B CN105895017 B CN 105895017B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2230/00—Details of flat display driving waveforms
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Abstract
The present invention provides a kind of pixel-driving circuit, driving method, display panel and devices.The pixel-driving circuit includes：Storage capacitance；Driving transistor；Data write unit；Luminous controling unit；And, reference voltage control unit, it is controlled when LED control signal is the first level and reference voltage is boosted to obtain output voltage, the output voltage is sent to the second end of the storage capacitance, the second end of reference voltage line and storage capacitance is controlled to connect when LED control signal is second electrical level；Within the predetermined time after the DC converter being connect with the first power supply signal input and second source signal input part is opened, the voltage difference of output voltage and reference voltage is more than predetermined voltage difference；Within the predetermined time, the first power supply signal of DC converter output from low transition be high level.The present invention solve the problems, such as the electric leakage defect due to driving transistor so as to cause DC converter can not start.
Description
Technical field
The present invention relates to display technology field more particularly to a kind of pixel-driving circuit, driving method, display panel and dresses
It puts.
Background technology
The existing direct current that the first power supply signal ELVDD and second source signal ELVSS is provided for pixel-driving circuit becomes
It is again by the predetermined time (such as can be 10ms) after high level, directly that the driver' s timing of parallel operation, which is ELVDD by low transition,
Current converter just exports ELVSS (i.e. ELVSS is low level by high level saltus step).But in the predetermined time, due to the first electricity
Source signal is high level by low transition, may result in the driving transistor that pixel-driving circuit includes and misleads, so as to
(Start-up Short Detection, are opened the SSD that can be caused in DC converter due to the electric leakage defect of the driving transistor
Dynamic short-circuit detecting) circuit can detect that second source signal input part has power supply in the predetermined time after DC converter startup
Signal inputs, and can not start so as to cause DC converter, and the driving transistor misleads to also result in and pixel electricity occurs
The great bad problem of the intrinsic booting splashette in road.
Invention content
It is a primary object of the present invention to provide a kind of pixel-driving circuit, driving method, display panel and device, solve
In the prior art since the electric leakage defect of driving transistor opens so as to cause the SSD circuits in DC converter in DC converter
Can detect that second source signal input part has power supply signal input in predetermined time after dynamic, so as to cause DC converter without
The problem of method starts, while can solve the problems, such as that the intrinsic booting splashette of pixel circuit is great bad.
In order to achieve the above object, the present invention provides a kind of pixel-driving circuit, including：
Storage capacitance；
Driving transistor, grid are connect with the first end of the storage capacitance, the first pole and the first power supply signal input
Connection；
Data write unit, respectively with scan line, data line, the second end of the storage capacitance, the driving transistor
Grid connected with the second pole of the driving transistor；
Luminous controling unit, respectively with the first of light emitting control line, the second pole of the driving transistor and light-emitting component
Pole connects；And
Reference voltage control unit, respectively with the second of the light emitting control line, reference voltage line and the storage capacitance
End connection, for being controlled when the LED control signal on the light emitting control line is the first level to the reference voltage line
Reference voltage boosted and obtain output voltage after, which is sent to the second end of the storage capacitance, when
The LED control signal controls the reference voltage line and the second end of the storage capacitance to connect when being second electrical level；
Second pole of the light-emitting component is connect with second source signal input part；
It is opened in the DC converter being connect with first power supply signal input and the second source signal input part
In predetermined time after opening, the voltage difference of the output voltage and the reference voltage is more than predetermined voltage difference；It is pre- at this
In fixing time, the first power supply signal of the DC converter output from low transition be high level.
During implementation, the reference voltage control unit includes：
First controlling transistor, grid are connect with the light emitting control line, and the first pole is connect with the reference voltage line, the
Two poles are connect with the second end of the storage capacitance；
Second controlling transistor, grid are connect with the light emitting control line, the first pole and the second end of the storage capacitance
Connection；And
Voltage control circuit, input terminal are connect with the reference voltage line, output terminal and second controlling transistor
Second pole connects, and output voltage is obtained for the reference voltage to be boosted.
During implementation, when first controlling transistor is n-type transistor, second controlling transistor is p-type crystal
Pipe；
When first controlling transistor is p-type transistor, second controlling transistor is n-type transistor.
During implementation, the voltage control circuit includes：Voltage-multiplying circuit, for the reference voltage carry out voltage doubling operations and
Obtain output voltage；
The voltage-multiplying circuit includes the first diode (led) module, times voltage capacitance and the second diode (led) module, wherein,
First pole of the first diode (led) module is connect with the reference voltage line, the second pole of first diode (led) module
It is connect with the first end of described times of voltage capacitance；
The second end access multiplication of voltage control signal of described times of voltage capacitance；
First pole of second diode (led) module is connect with the second end of described times of voltage capacitance, second diode die
Second pole of block is connect with the second end of the storage capacitance.
During implementation, first diode (led) module includes the first conducting transistor and the second conducting transistor, wherein,
It is described first conducting transistor grid connect with the first level line, it is described first be connected transistor the first pole and
The grid connection of the second conducting transistor, the second pole of the first conducting transistor and the described second conducting transistor
First pole connects；
Second pole of the second conducting transistor is connect with the reference voltage line；
Second diode (led) module includes third conducting transistor and the 4th conducting transistor, wherein,
The grid of the third conducting transistor is connect with the first level line, and the first of the third conducting transistor
Pole is connect with the grid of the described 4th conducting transistor, the second pole of the third conducting transistor and the described 4th conducting crystal
The first pole connection of pipe；
Second pole of the 4th conducting transistor is connect with the first end of described times of voltage capacitance, and the of described times of voltage capacitance
First pole of the one end also with the described second conducting transistor is connect；
Under the control of the first level, the first conducting transistor and third conducting transistor are in normally opened shape
State.
During implementation, pixel-driving circuit of the present invention further includes：Reset unit, respectively with reseting controling signal line,
Initial voltage line is connected with the first end of the storage capacitance, for being controlled under control of the reseting stage in reseting controling signal
Initial voltage accesses the first end of the storage capacitance.
During implementation, the data write unit is used in data write phase, the scanning signal in the scan line
Under control, control the data voltage on the data line that the second end of the storage capacitance is written, and control the driving crystal
The grid of pipe is connected with the second pole of the driving transistor；
The luminous controling unit, in the light emitting control stage, in the LED control signal of the light emitting control line
Second pole of the control lower control driving transistor is connect with the first pole of the light-emitting component.
During implementation, the reset unit includes：Reset transistor, grid are connect with the reseting controling signal line, and first
Pole is connect with the first end of the storage capacitance, and the second pole is connect with the initial voltage line；
The data write unit includes：
First writing transistor, grid are connect with the scan line, and the first pole is connect with the second end of the storage capacitance,
Second pole is connect with the data line；And
Second writing transistor, grid are connect with the scan line, and the first pole is connect with the grid of the driving transistor,
Second pole is connect with the second pole of the driving transistor；
The luminous controling unit includes：Light emitting control transistor, grid are connect with the light emitting control line, the first pole with
The first pole connection of the light-emitting component, the second pole is connect with the second pole of the driving transistor.
The present invention also provides a kind of driving method of pixel-driving circuit, for driving above-mentioned pixel-driving circuit,
The driving method includes：
It is opened in the DC converter being connect with first power supply signal input and the second source signal input part
In predetermined time after opening,
Scanning signal in the data write phase of each display cycle, scan line is the first level, light emitting control line
On LED control signal for second electrical level, the reference voltage Vref 1 on reference voltage control unit control reference voltage line is write
Enter the second end of storage capacitance, while storage capacitance is written in the data Vdata voltages on data write unit control data line
Second end, then the current potential of the second end of the storage capacitance is Vref1+Vdata；Data write unit controls the driving crystal
The grid of pipe is connected with the second pole of the driving transistor, so as to control driving transistor conducting until the driving transistor
Grid potential be ELVDD1+Vth；ELVDD1 is to be supplied to the first power supply signal defeated in the data write phase DC converter
Enter the voltage value of first power supply signal at end, Vth is the threshold voltage of the driving transistor；
In the light emitting control stage of each display cycle, scanning signal is second electrical level, and the LED control signal is the
One level is controlled after being boosted to the reference voltage on the reference voltage line and obtaining output voltage VO, by output electricity
Pressure VO is sent to the second end of the storage capacitance, and due to the storage capacitance first end and the storage capacitance second
Potential difference between end cannot be mutated, therefore the grid potential of the driving transistor is VO-Vref1-Vdata+ELVDD1+
Vth is supplied to the voltage value of the first power supply signal of the first power supply signal input in the light emitting control stage DC converter
Saltus step is ELVDD2, and the gate source voltage of driving transistor is VO-Vref1-Vdata+ELVDD1+Vth-ELVDD2, passes through control
The voltage value of VO and Vref1 is to compensate the first power supply signal in the data write phase and the voltage difference in the light emitting control stage
Value, so as to prevent the driving transistor from misleading.
The present invention also provides a kind of display panels, including DC converter, further include above-mentioned pixel-driving circuit；Institute
DC converter is stated for providing the first power supply signal for the first power supply signal input and being that second source signal input part carries
For second source signal.
The present invention also provides a kind of display device, including above-mentioned display panel.
Compared with prior art, pixel-driving circuit of the present invention, driving method, display panel and device are existing
Pixel compensation circuit on the basis of only need to increase reference voltage control unit, it is not necessary to modify IC (Integrated Circuit,
Integrated circuit) the electric leakage defect due to driving transistor can be solved so as to cause the SSD (Start-up in DC converter
Short Detection, start short-circuit detecting) circuit DC converter startup after predetermined time in can detect second electricity
Source signal input terminal has power supply signal input, the problem of so as to cause DC converter that can not start, while can solve pixel
The problem of intrinsic booting splashette of circuit is great bad.
Description of the drawings
Fig. 1 is the structure chart of the pixel-driving circuit described in the embodiment of the present invention；
Fig. 2 is the working timing figure of present invention pixel-driving circuit as shown in Figure 1；
Fig. 3 is the circuit diagram of the pixel-driving circuit described in another embodiment of the present invention；
Fig. 4 is the circuit diagram of the pixel-driving circuit described in further embodiment of this invention；
Fig. 5 is the circuit diagram of the pixel-driving circuit described in yet another embodiment of the invention；
Fig. 6 is the working timing figure of present invention pixel-driving circuit as shown in Figure 5；
Fig. 7 is the circuit diagram of the pixel-driving circuit described in further embodiment of this invention；
Fig. 8 is the circuit diagram of the pixel-driving circuit described in yet another embodiment of the invention；
Fig. 9 is the circuit diagram of a specific embodiment of pixel-driving circuit of the present invention；
Figure 10 is the working timing figure of the specific embodiment of pixel-driving circuit of the present invention；
Figure 11 is the voltage value schematic diagram of each voltage of the specific embodiment of pixel-driving circuit of the present invention.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without making creative work
Embodiment shall fall within the protection scope of the present invention.
As shown in Figure 1, the pixel-driving circuit described in the embodiment of the present invention includes：
Storage capacitance Cs；
Driving transistor DTFT, grid are connect with the first end NODE1 of the storage capacitance Cs, the first pole and the first power supply
Signal input part connects；First power supply signal ELVDD is inputted by first power supply signal input；
Data write unit 21, respectively with scan line GATE, data line Data, the storage capacitance Cs second end
NODE2, the driving transistor DTFT grid connected with the second pole of the driving transistor DTFT；And
Luminous controling unit 22, respectively with light emitting control line EM, the driving transistor DTFT the second pole and shine member
The first pole connection of part ED；And
Reference voltage control unit 23, respectively with the light emitting control line EM, the reference voltage line REF (reference voltages
Line REF output reference voltages) it is connected with the second end NODE2 of the storage capacitance Cs, for working as the light emitting control line EM
LED control signal for the first level when control the reference voltage on the reference voltage line REF is boosted to obtain it is defeated
After going out voltage VO, which is sent to the second end NODE2 of the storage capacitance Cs, when the LED control signal
For the reference voltage line REF is controlled to be connect with the second end NODE2 of the storage capacitance during second electrical level；
The second pole of the light-emitting element E D is connect with second source signal input part；It is inputted by the second source signal
End input second source signal ELVSS；
It is opened in the DC converter being connect with first power supply signal input and the second source signal input part
In predetermined time after opening, the output voltage VO and the voltage difference of the reference voltage are more than predetermined voltage difference；At this
In predetermined time, the first power supply signal ELVDD of DC converter output from low transition be high level.
In the pixel-driving circuit work described in the embodiment of the present invention, the predetermined time after DC converter unlatching
(predetermined time is as opened into the time of DC converter output second source signal, the pre- timing from DC converter
Between for example can be 10ms) in, by reference to the value of voltage control unit setting reference voltage, to work as LED control signal as the
Reference voltage control unit 23 is controlled to obtain output voltage VO, and the output is electric after boosting to reference voltage during one level
Pressure VO is sent to the second end NODE2 of storage capacitance, and it is predetermined that the voltage difference of output voltage VO and reference voltage is set to be more than
Voltage difference, to prevent driving transistor from misleading, so as to which reference only need to be increased on the basis of existing pixel compensation circuit
Voltage control unit, it is not necessary to modify IC (Integrated Circuit, integrated circuit) can solve due to DTFT electric leakage defects
Become so as to cause SSD (Start-up Short Detection start short-circuit detecting) circuit in DC converter in direct current
It can detect that second source signal input part has power supply signal input in predetermined time after parallel operation startup, so as to which direct current be caused to become
The problem of parallel operation can not start, while can solve the problems, such as that the intrinsic booting splashette of pixel circuit is great bad.
The specific embodiment of present invention pixel-driving circuit presented below comes for being twice by VO for reference voltage
Illustrate, but during practical operation when LED control signal is the first level reference voltage control unit 23 to reference voltage into
Capable boost operations are not limited to voltage doubling operations, the value of output voltage VO are not defined, and only need to set output voltage VO
It is more than predetermined voltage difference with the voltage difference of reference voltage, to prevent driving transistor from misleading.
As shown in Fig. 2, the embodiment of pixel-driving circuit as shown in Figure 1 of the invention is at work,
In predetermined time after DC converter unlatching (such as one after being opened for the DC converter
In frame time),
Scanning signal on data write phase TR, GATE is the first level (being in figure 3 low level), light emitting control
LED control signal on line EM is second electrical level (being in figure 3 high level), and the control of reference voltage control unit 23 is with reference to electricity
The second end NODE2 of Cs is written in reference voltage Vref 1 on crimping REF, while on data write unit control data line Data
Data voltage Vdata write-ins storage capacitance Cs second end NODE2, then the second end NODE2 of the storage capacitance Cs electricity
Position is Vref1+Vdata；Data write unit 21 controls the grid of the driving transistor DTFT and the driving transistor
The second pole connection of DTFT, so as to control the driving transistor DTFT conductings until the grid electricity of the driving transistor DTFT
Position is ELVDD1+Vth；ELVDD1 is that the first power supply signal input is supplied in the data write phase DC converter
The voltage value of one power supply signal, Vth are the threshold voltage of the driving transistor DTFT；
Scanning signal on light emitting control stage TE, GATE is second electrical level (being in figure 3 high level), described to shine
Control signal is the first level (being in figure 3 low level), is controlled to the reference voltage Vref 1 on the reference voltage line REF
It is boosted after obtaining output voltage VO, which is sent to the second end NODE2 of the storage capacitance Cs, and
Since the potential difference between the second end Node2 of the first end NODE1 and the storage capacitance Cs of the storage capacitance Cs cannot
Mutation, therefore the grid potential of the driving transistor DTFT is VO-Vref1-Vdata+ELVDD1+Vth, in the light emitting control
Stage T3 DC converter be supplied to the voltage value saltus step of the first power supply signal of the first power supply signal input for ELVDD2 (
During practical operation, ELVDD1 is low level, and ELVDD2 is high level), the gate source voltage of driving transistor is VO-Vref1-
Vdata+ELVDD1+Vth-ELVDD2 is write by controlling the voltage value of VO and Vref1 with compensating the first power supply signal in the data
Enter the voltage difference in stage and the light emitting control stage, so as to prevent the driving transistor DTFT from misleading；
In practical operation, as shown in Fig. 2, by DTFT for for p-type transistor, in light emitting control stage TE, if you need to control
Driving transistor DTFT shutdowns processed, then the gate source voltage Vgs of driving transistor DTFT need to be more than Vth, i.e. VO-Vref1-Vdata+
ELVDD1+Vth-ELVDD2 ＞ Vth, VO-Vref1-Vdata+ELVDD1-ELVDD2 ＞ 0 namely VO-Vdata need to be controlled to be more than
Vref1+ELVDD2-ELVDD1 could cause driving transistor DTFT to be not turned on, then the predetermined voltage difference need to be set as
Vref1+ELVDD2-ELVDD1。
The transistor used in all embodiments of the invention all can be thin film transistor (TFT) or field-effect tube or other characteristics
Identical device.In embodiments of the present invention, to distinguish the two poles of the earth of transistor in addition to grid, wherein first will be known as in a pole
Pole, another pole are known as the second pole.In addition, transistor can be divided into n-type transistor or p-type crystalline substance according to the characteristic differentiation of transistor
Body pipe, it is contemplated that realizing that circuit is that those skilled in the art can not make wound using different types of transistor
It is readily occurred under the premise of the property made labour, therefore the pixel-driving circuit of transistor types conversion is also in the embodiment of the present invention
In protection domain.
Specifically, as shown in figure 3, the reference voltage control unit 23 can include：
First controlling transistor TC1, grid are connect with the light emitting control line EM, the first pole and the reference voltage line
REF connections, the second pole are connect with the second end NODE2 of the storage capacitance Cs；
Second controlling transistor TC2, grid are connect with the light emitting control line EM, and the first pole is with the storage capacitance Cs's
Second end NODE2 connections；And
Voltage control circuit 230, input terminal are connect with the reference voltage line REF, and output terminal and the described second control are brilliant
The second pole connection of body pipe TC2, output voltage is obtained for the reference voltage on the reference voltage line REF to be boosted
VO。
In an embodiment as illustrated in figure 3, TC1 is n-type transistor, and TC2 is p-type transistor, but applies TC1 when operating
Transistor types and the transistor types of TC2 be not limited to this.
When pixel-driving circuit as shown in Figure 3 at work, the LED control signal on data write phase TR, EM
For high level, TC1 conductings, so as to control the reference voltage Vref 1 on reference voltage line REF that NODE2 is written, TC2 is disconnected；It is sending out
Photocontrol stage TE, EM are low level, and TC1 is disconnected, TC2 conductings, so as to which the VO that voltage control circuit 230 exports passes through conducting
TC2 is sent to NODE2.
Specifically, when the first controlling transistor TC1 is n-type transistor, the second controlling transistor TC2 is p
Transistor npn npn；
When the first controlling transistor TC2 is p-type transistor, the second controlling transistor TC1 is N-shaped crystal
Pipe.
Specifically, as shown in figure 4, the voltage control circuit includes：Voltage-multiplying circuit 231, for the reference voltage
Reference voltage on line REF carries out voltage doubling operations and obtains output voltage VO；
The voltage-multiplying circuit 231 includes the first diode (led) module 232, times voltage capacitance Cd and the second diode (led) module 233,
In,
First pole of the first diode (led) module 232 is connect with the reference voltage line REF, first diode (led) module
232 the second pole is connect with the first end of described times of voltage capacitance Cd；
The second end access multiplication of voltage control signal LX of described times of voltage capacitance Cd；
First pole of second diode (led) module 233 is connect with the second end of described times of voltage capacitance Cd, and the described 2nd 2
Second pole of pole pipe module 233 is connect with the second end NODE2 of the storage capacitance Cs.
Specifically, as shown in figure 5, first diode (led) module 232 includes the first conducting transistor TD1 and the second conducting
Transistor TD2, wherein,
The grid of the first conducting transistor TD1 is connect with the first level line VL1, the first conducting transistor TD1
The first pole connect with the grid of the described second conducting transistor TD2, described first be connected the second pole of transistor TD1 with it is described
The first pole connection of second conducting transistor TD2；
The second pole of the second conducting transistor TD2 is connect with the reference voltage line REF；
Second diode (led) module 233 includes the third conducting transistor TD4 of conducting transistor TD3 and the 4th, wherein,
The grid of the third conducting transistor TD3 is connect with the first level line VL1, and transistor is connected in the third
The first pole of TD3 connect with the grid of the described 4th conducting transistor TD4, the second pole of the third conducting transistor TD3 and
The first pole connection of the 4th conducting transistor TD4；
The second pole of the 4th conducting transistor TD4 is connect with the Cd first ends of described times of voltage capacitance, described times of piezoelectricity
Hold first pole of the first end of Cd also with the described second conducting transistor TD2 to connect；
Under the control of the first level on the first level line VL1, the first conducting transistor TD1 and the third are led
Logical transistor TD2 is in normally open.
As shown in figure 5, TD1 and TD2 are p-type transistor, TD3 and TD4 are also p-type transistor, the first level line VL1
Low level is exported, TD1, TD2, TD3 and TD4 are all in normally open.
In practical operation, in the predetermined time after DC converter unlatching, as shown in fig. 6, in the light emitting control stage
TE, when the LED control signal on EM is second electrical level (i.e. low level), LX is the first level (i.e. high level), with control times
The VO that volt circuit 231 exports is twice of reference voltage；
And as shown in fig. 6, DC converter unlatching after predetermined time in, when EM be the first level (i.e. high level)
When, LX optimal is second electrical level (i.e. low level), but in practical operation under the premise of EM is the first level, LX can also
For the first level, at this time since TC2 is to disconnect, the value of LX does not influence the current potential of NODE2.
Specifically, as shown in fig. 7, the pixel-driving circuit described in the embodiment of the present invention further includes：Reset unit 24, respectively
With reseting controling signal line Rest, initial voltage line (the initial voltage line exports initial voltage Vint) and the storage capacitance
The first end NODE1 connections of Cs, for the reseting controling signal in reseting stage on the reseting controling signal line Rest
The lower control initial voltage Vint of control accesses the first end NODE1 of the storage capacitance Cs.
Specifically, the data write unit 21 is used in data write phase, the scanning on the scan line GATE
Under the control of signal, control the data voltage on the data line Data that the second end NODE2 of the storage capacitance Cs is written, and
The grid of the driving transistor DTFT is controlled to be connected with the second pole of the driving transistor DTFT；
The luminous controling unit 22, in the light emitting control stage, believing in the light emitting control of the light emitting control line EM
Number control under the second pole of the driving transistor DTFT is controlled to be connect with the first pole of the light-emitting element E D.
Specifically, as shown in figure 8, the reset unit 24 includes：Reset transistor TR, grid reset control letter with described
Number line Rest connections, the first pole are connect with the first end NODE1 of the storage capacitance Cs, and the second pole connects with the initial voltage line
It connects；
The data write unit 21 includes：
First writing transistor TW1, grid are connect with the scan line GATE, and the of the first pole and the storage capacitance Cs
Two end NODE2 connections, the second pole is connect with the data line；And
Second writing transistor TW2, grid are connect with the scan line GATE, the first pole and the driving transistor DTFT
Grid connection, the second pole is connect with the second pole of the driving transistor DTFT；
The luminous controling unit 22 includes：Light emitting control transistor TE, grid are connect with the light emitting control line EM, the
One pole is connect with the first pole of the light-emitting element E D, and the second pole is connect with the second pole of the driving transistor DTFT.
In the embodiment shown in fig. 8, TR, TW1, TW2 and TE be for p-type transistor, but during practical operation more than
Transistor may be n-type transistor, and the type to transistor is simultaneously not construed as limiting.
Illustrate pixel-driving circuit of the present invention below by a specific embodiment.
As shown in figure 9, a specific embodiment of pixel-driving circuit of the present invention includes storage capacitance Cs, driving crystalline substance
Body pipe DTFT, data write unit 21, luminous controling unit 22, reference voltage control unit 23 and reset unit 24；
The light-emitting component of the specific embodiment driving of pixel-driving circuit of the present invention is Organic Light Emitting Diode
OLED；
The grid of the driving transistor DTFT is connect with the first end NODE1 of the storage capacitance Cs, and the driving is brilliant
The source electrode of body pipe DTFT accesses the first power supply signal ELVDD；
The reference voltage control unit 23 includes the first controlling transistor TC1, the second controlling transistor TC2 and voltage control
Circuit processed, wherein,
The grid of TC1 is connect with light emitting control line EM, and the drain electrode of TC1 is connect with reference voltage line REF, the source electrode of TC1 with
The second end NODE2 connections of the storage capacitance Cs；
The grid of TC2 is connect with the light emitting control line EM, the drain electrode of TC2 and the second end of the storage capacitance Cs
NODE2 connections；
The voltage control circuit includes voltage-multiplying circuit；
The voltage-multiplying circuit includes the first diode (led) module, times voltage capacitance Cd and the second diode (led) module；
The second end access multiplication of voltage control signal LX of described times of voltage capacitance Cd；
First diode (led) module includes the first conducting transistor TD1 and the second conducting transistor TD2, wherein,
The grid access low level VGL of the first conducting transistor TD1, the source electrode of the first conducting transistor TD1
It is connect with the grid of the described second conducting transistor TD2, the drain electrode and the described second conducting of the first conducting transistor TD1 is brilliant
The drain electrode connection of body pipe TD2；
The source electrode of the second conducting transistor TD2 is connect with the reference voltage line REF；
Second diode (led) module 233 includes the third conducting transistor TD4 of conducting transistor TD3 and the 4th, wherein,
The grid access low level VGL of the third conducting transistor TD3, the source electrode of the third conducting transistor TD3
It is connect with the grid of the described 4th conducting transistor TD4, the drain electrode and the described 4th conducting of the third conducting transistor TD3 is brilliant
The drain electrode connection of body pipe TD4；
The source electrode of the 4th conducting transistor TD4 is connect with the Cd first ends of described times of voltage capacitance, described times of voltage capacitance
Drain electrode of the first end of Cd also with the described second conducting transistor TD2 is connect；
Since the grid of TD1 and the grid of TD3 access low level, the first conducting transistor TD1 and described the
Three conducting transistor TD2 are in normally open；
The reset unit 24 includes reset transistor TR；
The grid of TR is connect with reseting controling signal line Rest, the drain electrode of TR and the first end of the storage capacitance Cs
NODE1 connections, the source electrode of TR are connect with the initial voltage line；Initial voltage on the initial voltage line is denoted as Vint；
The data write unit 21 includes the first writing transistor TW1 and the second writing transistor TW2；
The grid of TW1 is connect with scan line GATE, and the drain electrode of TW1 is connect with the second end NODE2 of the storage capacitance Cs,
The source electrode of TW1 is connect with the data line；Data voltage on the data line is denoted as Vdata；
The grid of TW2 is connect with the scan line GATE, and the source electrode of TW2 and the grid of the driving transistor DTFT connect
It connects, the drain electrode of TW2 is connect with the drain electrode of the driving transistor DTFT；
The luminous controling unit 22 includes light emitting control transistor TE；
The grid of TE is connect with the light emitting control line EM, and the drain electrode of TE connects with the anode of Organic Light Emitting Diode OLED
It connects, the source electrode of TE is connect with the drain electrode of the driving transistor DTFT；
The cathode access second source signal ELVSS of Organic Light Emitting Diode OLED.
In specific embodiment as shown in Figure 9, ELVDD is high level, and ELVSS is low level, and TC1 is n-type transistor,
And other transistors that pixel-driving circuit shown in Fig. 9 includes all are p-type transistor；But in practical operation, more than
The type of transistor can change, the type of transistor is not defined.
As shown in Figure 10, the specific embodiment of pixel-driving circuit of the present invention at work,
Reseting stage t1, EM the output high level of first frame after DC converter startup, Rest output low levels,
GATE exports high level, and LX is low level, and REF exports Vref1, TC1 conductings, NODE2 access Vref1, Node1 accesses at this time
Vint；
In the data write phase t2 of the first frame, GATE output low levels, EM output high level, LX is low level, REF
Vref1 is still exported, NODE2 is written in Vref1 by TC1 conductings, and NODE2 is written, then in data voltage Vdata by TW1 conductings
The current potential of NODE2 is Vref1+Vdata, and TW2 conductings, the grid of DTFT is connected with the drain electrode of DTFT, so as to which DTFT be controlled to be connected
Until the grid potential of DTFT is ELVDD1+Vth；Wherein, Vth is the threshold voltage of DTFT, and ELVDD1 is the first power supply signal
In the voltage value of data write phase t2；
In the light emitting control stage t3 of the first frame, GATE output high level, EM exports low level, and TC2 is connected, and REF is defeated
Go out Vref1, the voltage value of the first power supply signal at this time is ELVDD2, and LX is high level, so as to by TD1, TD2, TD3, TD4 and Cd
The voltage-multiplying circuit work of composition, so as to which VO be controlled to be equal to 2Vref1, and is sent to NODE2 by VO, due to NODE1 and NODE2 it
Between potential difference cannot be mutated, then set the current potential of NODE1 at this time as V1, then 2Vref1-V2=Vref1+Vdata-Vth, V2=
ELVDD1+Vth+Vref1-Vdata, and the source potential of DTFT is ELVDD2 at this time, then the gate source voltage Vgs of DTFT is
ELVDD1+Vth+Vref1-Vdata-ELVDD2, and in practical operation, ELVDD1 is usually smaller than ELVDD2, for example, ELVDD1
Can be 0V, and ELVDD2 can be 4.6V, the specific embodiment of pixel-driving circuit of the present invention passes through in SSD
(Start-up Short Detection the start short-circuit detecting) stage (in the first frame time that i.e. DC converter has just been opened)
The voltage value of reference voltage is put into height, so that Vgs is more than Vth, so as to prevent DTFT from misleading.
As shown in figure 11, in the first frame time just opened in DC converter, the reference voltage level on REF is Vref1,
The voltage value of Vint is Vint1, and after having served as the predetermined time, the reference voltage on REF is Vref2, and the voltage value of Vint is
Vint2, Vref2 are more than Vref1, and interior between the first frame, and the voltage value of the first power supply signal ELVDD is risen by ELVDD1
For ELVDD2, after ELVDD rises a period of time, the voltage value of second source signal ELVSS falls to ELVSS2 by ELVSS1.
In the specific embodiment work of present invention pixel-driving circuit as shown in Figure 9, exported with DC converter
The first power supply signal and second source signal illustrate its work for saltus step in the first frame time after DC converter output
Process, but in practical operation, the saltus step of the first power supply signal and second source signal is not limited to direct current
In the first frame time after converter unlatching, change the time occurred to power supply signal and be not construed as limiting.
The driving method of pixel-driving circuit described in the embodiment of the present invention, for driving above-mentioned pixel-driving circuit,
The driving method includes：
It is opened in the DC converter being connect with first power supply signal input and the second source signal input part
In predetermined time after opening,
Scanning signal in the data write phase of each display cycle, scan line is the first level, light emitting control line
On LED control signal for second electrical level, the reference voltage Vref 1 on reference voltage control unit control reference voltage line is write
Enter the second end of storage capacitance, while storage capacitance is written in the data Vdata voltages on data write unit control data line
Second end, then the current potential of the second end of the storage capacitance is Vref1+Vdata；Data write unit controls the driving crystal
The grid of pipe is connected with the second pole of the driving transistor, so as to control driving transistor conducting until the driving transistor
Grid potential be ELVDD1+Vth；ELVDD1 is to be supplied to the first power supply signal defeated in the data write phase DC converter
Enter the voltage value of first power supply signal at end, Vth is the threshold voltage of the driving transistor；
In the light emitting control stage of each display cycle, scanning signal is second electrical level, and the LED control signal is the
One level is controlled after being boosted to the reference voltage on the reference voltage line and obtaining output voltage VO, by output electricity
Pressure VO is sent to the second end of the storage capacitance, and due to the storage capacitance first end and the storage capacitance second
Potential difference between end cannot be mutated, therefore the grid potential of the driving transistor is VO-Vref1-Vdata+ELVDD1+
Vth is supplied to the voltage value of the first power supply signal of the first power supply signal input in the light emitting control stage DC converter
Saltus step is ELVDD2, and the gate source voltage of driving transistor is VO-Vref1-Vdata+ELVDD1+Vth-ELVDD2, passes through control
The voltage value of VO and Vref1 is to compensate the first power supply signal in the data write phase and the voltage difference in the light emitting control stage
Value, so as to prevent the driving transistor from misleading.
Display panel described in the embodiment of the present invention including DC converter, further includes above-mentioned pixel-driving circuit；Institute
DC converter is stated for providing the first power supply signal for the first power supply signal input and being that second source signal input part carries
For second source signal.
Display device described in the embodiment of the present invention includes above-mentioned display panel.
The above is the preferred embodiment of the present invention, it is noted that for those skilled in the art
For, without departing from the principles of the present invention, several improvements and modifications can also be made, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (11)
1. a kind of pixel-driving circuit, which is characterized in that including：
Storage capacitance；
Driving transistor, grid are connect with the first end of the storage capacitance, and the first pole is connect with the first power supply signal input；
Data write unit, respectively with scan line, data line, the second end of the storage capacitance, the driving transistor grid
Pole is connected with the second pole of the driving transistor；
Luminous controling unit connects respectively with the first pole of light emitting control line, the second pole of the driving transistor and light-emitting component
It connects；And
Reference voltage control unit connects respectively with the second end of the light emitting control line, reference voltage line and the storage capacitance
It connects, for being controlled when the LED control signal on the light emitting control line is the first level to the ginseng on the reference voltage line
It examines after voltage boosted and obtain output voltage, which is sent to the second end of the storage capacitance, when described
LED control signal controls the reference voltage line and the second end of the storage capacitance to connect when being second electrical level；
Second pole of the light-emitting component is connect with second source signal input part；
After the DC converter being connect with first power supply signal input and the second source signal input part is opened
Predetermined time in, the voltage difference of the output voltage and the reference voltage is more than predetermined voltage difference；In the pre- timing
In, the first power supply signal of DC converter output from low transition be high level.
2. pixel-driving circuit as described in claim 1, which is characterized in that the reference voltage control unit includes：
First controlling transistor, grid are connect with the light emitting control line, and the first pole is connect with the reference voltage line, the second pole
It is connect with the second end of the storage capacitance；
Second controlling transistor, grid are connect with the light emitting control line, and the first pole is connect with the second end of the storage capacitance；
And
Voltage control circuit, input terminal are connect with the reference voltage line, output terminal and the second of second controlling transistor
Pole connects, and output voltage is obtained for the reference voltage to be boosted.
3. pixel-driving circuit as claimed in claim 2, which is characterized in that when first controlling transistor is N-shaped crystal
Guan Shi, second controlling transistor are p-type transistor；
When first controlling transistor is p-type transistor, second controlling transistor is n-type transistor.
4. pixel-driving circuit as claimed in claim 3, which is characterized in that the voltage control circuit includes：Voltage-multiplying circuit,
Output voltage is obtained for carrying out voltage doubling operations to the reference voltage；
The voltage-multiplying circuit includes the first diode (led) module, times voltage capacitance and the second diode (led) module, wherein,
First pole of the first diode (led) module is connect with the reference voltage line, the second pole of first diode (led) module and institute
State the first end connection of times voltage capacitance；
The second end access multiplication of voltage control signal of described times of voltage capacitance；
First pole of second diode (led) module is connect with the second end of described times of voltage capacitance, second diode (led) module
Second pole is connect with the second end of the storage capacitance.
5. pixel-driving circuit as claimed in claim 4, which is characterized in that first diode (led) module includes the first conducting
Transistor and the second conducting transistor, wherein,
It is described first conducting transistor grid connect with the first level line, it is described first be connected transistor the first pole with it is described
The grid connection of second conducting transistor, the second pole of the first conducting transistor and the first of the described second conducting transistor
Pole connects；
Second pole of the second conducting transistor is connect with the reference voltage line；
Second diode (led) module includes third conducting transistor and the 4th conducting transistor, wherein,
The grid of the third conducting transistor connect with the first level line, the third be connected transistor the first pole and
The grid connection of the 4th conducting transistor, the second pole of the third conducting transistor and the described 4th conducting transistor
First pole connects；
Second pole of the 4th conducting transistor is connect with the first end of described times of voltage capacitance, the first end of described times of voltage capacitance
The first pole also with the described second conducting transistor is connect；
Under the control of the first level, the first conducting transistor and third conducting transistor are in normally open.
6. the pixel-driving circuit as described in any claim in claim 1 to 5, which is characterized in that further include：It resets single
Member, respectively the first end with reseting controling signal line, initial voltage line and the storage capacitance connect, for existing in reseting stage
Initial voltage is controlled to access the first end of the storage capacitance under the control of reseting controling signal.
7. pixel-driving circuit as claimed in claim 6, which is characterized in that the data write unit, for being write in data
Enter the stage, under the control of the scanning signal in the scan line, control and deposited described in the write-in of the data voltage on the data line
The second end that storing up electricity is held, and the grid of the driving transistor is controlled to be connected with the second pole of the driving transistor；
The luminous controling unit, in the light emitting control stage, in the control of the LED control signal of the light emitting control line
Second pole of the lower control driving transistor is connect with the first pole of the light-emitting component.
8. pixel-driving circuit as claimed in claim 7, which is characterized in that the reset unit includes：Reset transistor, grid
Pole is connect with the reseting controling signal line, and the first pole is connect with the first end of the storage capacitance, the second pole with it is described initial
Pressure-wire connects；
The data write unit includes：
First writing transistor, grid are connect with the scan line, and the first pole is connect with the second end of the storage capacitance, and second
Pole is connect with the data line；And
Second writing transistor, grid are connect with the scan line, and the first pole is connect with the grid of the driving transistor, and second
Pole is connect with the second pole of the driving transistor；
The luminous controling unit includes：Light emitting control transistor, grid are connect with the light emitting control line, the first pole with it is described
The first pole connection of light-emitting component, the second pole is connect with the second pole of the driving transistor.
9. a kind of driving method of pixel-driving circuit, for driving the picture as described in any claim in claim 1 to 8
Plain driving circuit, which is characterized in that the driving method includes：
After the DC converter being connect with first power supply signal input and the second source signal input part is opened
Predetermined time in,
Scanning signal in the data write phase of each display cycle, scan line is the first level, on light emitting control line
LED control signal is second electrical level, and reference voltage control unit controls the write-in of reference voltage Vref 1 on reference voltage line to deposit
The second end that storing up electricity is held, while second of the data Vdata voltages write-in storage capacitance on data write unit control data line
End, then the current potential of the second end of the storage capacitance is Vref1+Vdata；Data write unit controls the driving transistor
Grid is connected with the second pole of the driving transistor, so as to control driving transistor conducting until the grid of the driving transistor
Electrode potential is ELVDD1+Vth；ELVDD1 is to be supplied to the first power supply signal input in the data write phase DC converter
The first power supply signal voltage value, Vth be the driving transistor threshold voltage；
In the light emitting control stage of each display cycle, scanning signal is second electrical level, and the LED control signal is the first electricity
It is flat, it controls after being boosted to the reference voltage on the reference voltage line and obtaining output voltage VO, by the output voltage VO
Be sent to the second end of the storage capacitance, and due to the storage capacitance first end and the storage capacitance second end it
Between potential difference cannot be mutated, therefore the grid potential of the driving transistor be VO-Vref1-Vdata+ELVDD1+Vth,
The light emitting control stage DC converter is supplied to the voltage value saltus step of the first power supply signal of the first power supply signal input to be
ELVDD2, the gate source voltage of driving transistor are VO-Vref1-Vdata+ELVDD1+Vth-ELVDD2, by control VO and
The voltage value of Vref1 to compensate the first power supply signal in the data write phase and the voltage difference in the light emitting control stage, from
And prevent the driving transistor from misleading.
10. a kind of display panel, including DC converter, which is characterized in that further include such as right any in claim 1 to 8
It is required that the pixel-driving circuit；The DC converter is used to provide the first power supply signal for the first power supply signal input
And provide second source signal for second source signal input part.
11. a kind of display device, which is characterized in that including display panel as claimed in claim 10.
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| CN111785210A (en) * | 2020-07-16 | 2020-10-16 | 京东方科技集团股份有限公司 | Pixel circuit, driving method thereof, display substrate and display device |
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| CN103985350B (en) * | 2014-04-29 | 2016-09-07 | 上海天马有机发光显示技术有限公司 | A kind of image element circuit, display floater, display device and driving method |
| CN104103238B (en) * | 2014-06-17 | 2016-04-06 | 京东方科技集团股份有限公司 | A kind of image element circuit and driving method, display device |
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