CN108962143A - A kind of pixel-driving circuit and display panel - Google Patents
A kind of pixel-driving circuit and display panel Download PDFInfo
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- CN108962143A CN108962143A CN201810818268.4A CN201810818268A CN108962143A CN 108962143 A CN108962143 A CN 108962143A CN 201810818268 A CN201810818268 A CN 201810818268A CN 108962143 A CN108962143 A CN 108962143A
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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]
- G09G3/3225—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] using an active matrix
- G09G3/3233—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] using an active matrix with pixel circuitry controlling the current through the light-emitting element
Abstract
Pixel-driving circuit and display panel provided by the invention, by increasing by a high frequency control module, the high frequency control module controls the luminous frequency of luminescent device under the control of high-frequency controling signal, and electric current can be continued through to avoid luminescent material to be caused to decay and generate ghost phenomena；Furthermore it is possible to eliminate influence of the threshold voltage of driving transistor to driving current, keep shining for luminescent device more uniform and stable.
Description
Technical field
The present invention relates to field of display technology more particularly to a kind of pixel-driving circuits and display panel.
Background technique
Referring to Fig. 1, Fig. 1 is the structural schematic diagram of existing pixel-driving circuit.As shown in Figure 1, existing pixel is driven
Dynamic circuit includes luminescent device OLED, driving transistor T2, switching transistor T1 and storage capacitance Cst.Wherein, storage capacitance
The threshold voltage of Cst storage driving transistor T2, one end of storage capacitance Cst and the control terminal and switch of driving transistor T2
The second end of transistor T1 connects, the other end of storage capacitance Cst and the second end and luminescent device of driving transistor T2
The anode of OLED connects；The control terminal of switching transistor T1 connects driving signal S1, and first end connects data-signal Data；Driving
Crystal T2 first end connects the first power supply signal Vdd, and the cathode of luminescent device OLED connects reset signal Vss.Data believe Data
The control terminal of driving transistor T2 is supplied to by switching transistor T1, it is big with the on-off and the electric current that control driving transistor T2
It is small, it is shone with controlling luminescent device OLED.
Electric current I when luminescent device OLED shinesOLEDCorrespond to the electric current of gate source voltage Vgs, electricity for driving transistor T2
Flow IOLEDIt can be indicated with following equation, IOLED=k (Vgs-Vth) 2=k (VDD-VData- | Vth |) 2, it can from equation
Out, in above-mentioned pixel-driving circuit, electric current IOLEDDepending on driving the threshold voltage vt h of transistor T2, therefore driving
The variation of threshold voltage in transistor T2 will lead to luminescent device OLED non-uniform light, influence image quality.
In addition, since itself principle of luminosity causes luminescent material occur after same pixel keeps same brightness for a long time to decline
Subtract phenomenon.
Summary of the invention
The present invention provides a kind of pixel-driving circuit and display panel, and the threshold voltage that can compensate for driving transistor becomes
Change, and electric current can be continued through to avoid luminescent material to cause to decay and generate ghost phenomena.
The present invention provides a kind of pixel-driving circuit comprising: reseting module, compensating module, light emitting module and high frequency control
Molding block；
The reseting module is believed for receiving the second driving signal and resetting under the control of second driving signal
Number it is transmitted to the compensating module and the light emitting module, to reset the compensating module and the light emitting module；
The compensating module is for receiving the first driving signal and data being written under the control of first driving signal
Signal simultaneously carries out threshold voltage compensation；
The light emitting module is for receiving third driving signal and shining under the control of the third driving signal；
The high frequency control module is for receiving high-frequency controling signal and controlling under the control of the high-frequency controling signal
The luminous frequency of the light emitting module.
In pixel-driving circuit of the present invention, the reseting module includes: third transistor and the 4th transistor；
The control terminal of the third transistor is connect with second driving signal, the first end of the third transistor with
The reset signal connection, the second end of the third transistor are connect with the high frequency control module；
It the control terminal of 4th transistor and is connect with second driving signal, the first end of the 4th transistor
It is connect with the reset signal, the second end of the 4th transistor is connect with the compensating module.
In pixel-driving circuit of the present invention, the compensating module include: the first transistor, second transistor,
Drive transistor and storage capacitance；
It is described driving transistor control terminal respectively with the second end of the storage capacitance, the second transistor first
End, the reseting module connection, it is described driving transistor first end respectively with the second end of the first transistor, the hair
The second end of optical module connection, the driving transistor connects with the second end of the second transistor, the light emitting module respectively
It connects；
The first end of the first transistor and the control terminal of the second transistor are connect with the data-signal；
The control terminal of the first transistor and the control terminal of the second transistor connect with first driving signal
It connects；
The first end of the storage capacitance is connect with the light emitting module.
In pixel-driving circuit of the present invention, the light emitting module include: the 5th transistor, the 6th transistor and
Luminescent device；
The control terminal of 5th transistor is connect with the third driving signal, the first end of the 5th transistor with
The connection of first power supply signal, the second end of the 5th transistor are connect with the first end of the driving transistor；
The control terminal of 6th transistor is connect with the third driving signal, the first end of the 6th transistor with
The second end connection of the driving transistor, the second end of the 6th transistor are connect with the high frequency control module；
The anode tap of the luminescent device is connect with the high frequency control module, the cathode of the luminescent device and the second electricity
Source signal connection.
In pixel-driving circuit of the present invention, the high frequency control module includes the 7th transistor；
The control terminal of 7th transistor is connect with the high-frequency controling signal, the first end of the 7th transistor with
The second end of 6th transistor connects, and the second end of the 7th transistor is connect with the anode of the luminescent device.
In pixel-driving circuit of the present invention, the first transistor to the 7th transistor is PMOS tube,
The driving transistor is PMOS tube.
In pixel-driving circuit of the present invention, first driving signal, second driving signal, described
Three driving signals and the high-frequency controling signal are provided by external sequence controller.
In pixel-driving circuit of the present invention, the driver' s timing of the pixel-driving circuit includes:
Reseting stage resets the control terminal and the luminescent device of the driving transistor；
Compensated stage grabs the threshold voltage of the driving transistor and is stored in the storage capacitance；
Light emitting phase, pixel-driving circuit generates driving current and under the control of the high-frequency controling signal, with default
Frequency is provided to the luminescent device, for driving the luminescence display of the luminescent device.
In pixel-driving circuit of the present invention, the frequency of the high-frequency controling signal is between 24 hertz to 500 hertz
Between hereby.
The present invention also provides a kind of display panels comprising pixel-driving circuit as described above.
The invention has the benefit that pixel-driving circuit provided by the invention and display panel, by increasing by a high frequency
Control module, the high frequency control module control the luminous frequency of luminescent device under the control of high-frequency controling signal, can be to avoid
Luminescent material, which continues through electric current, to be caused to decay and generate ghost phenomena；Furthermore it is possible to eliminate the threshold voltage of driving transistor
Influence to driving current keeps shining for luminescent device more uniform and stable.
Detailed description of the invention
It, below will be to embodiment or the prior art in order to illustrate more clearly of embodiment or technical solution in the prior art
Attached drawing needed in description is briefly described, it should be apparent that, the accompanying drawings in the following description is only some of invention
Embodiment for those of ordinary skill in the art without creative efforts, can also be attached according to these
Figure obtains other attached drawings.
Fig. 1 is the structural schematic diagram of existing pixel-driving circuit；
Fig. 2 is the structural schematic diagram of pixel-driving circuit provided by the invention；
Fig. 3 is the circuit diagram of pixel-driving circuit provided by the invention；
Fig. 4 is the timing diagram of the driving signal of pixel-driving circuit provided by the invention.
Specific embodiment
LCD assembly provided in an embodiment of the present invention is described in detail above, it is used herein specifically a
Principle and implementation of the present invention are described for example, the present invention that the above embodiments are only used to help understand.
Meanwhile for those skilled in the art, according to the thought of the present invention, it has change in specific embodiments and applications
Become place, in conclusion the contents of this specification are not to be construed as limiting the invention.The explanation of following embodiment is reference
Additional diagram, to illustrate specific embodiments of the invention that may be implemented.The direction term that the present invention is previously mentioned, such as
[on], [under], [preceding], [rear], [left side], [right side], [interior], [outer], [side] etc. are only the directions with reference to annexed drawings.Therefore,
The direction term used is to illustrate and understand the present invention, rather than to limit the present invention.The similar unit of structure in the figure
It is with being given the same reference numerals.
Referring to Fig.2, Fig. 2 is the structural schematic diagram of pixel-driving circuit provided by the invention.As shown in Fig. 2, the pixel is driven
Dynamic circuit, comprising: reseting module 11, compensating module 12, light emitting module 13 and high frequency control module 14；
Reseting module 11 is for receiving the second driving signal S2 and under the control of the second driving signal S2 by reset signal
VI is transmitted to compensating module 13 to reset compensating module 13；
Compensating module 12 is believed for receiving the first driving signal S1 and data being written under the control of the first driving signal S1
Number Vdata simultaneously carries out threshold voltage compensation；
Light emitting module 13 is for receiving third driving signal S3 and shining under the control of third driving signal S3；
High frequency control module 14 is sent out for receiving high-frequency controling signal S4 and controlling under the control of high-frequency controling signal S4
The luminous frequency of optical module 13.
Specifically, referring to Fig. 3, Fig. 3 is the circuit diagram of pixel-driving circuit provided by the invention.As shown in figure 3,
The pixel-driving circuit, comprising: driving transistor DT, storage capacitance Cst, luminescent device OLED, the first transistor T1, the second crystalline substance
Body pipe T2, third transistor T3, the 4th transistor T4, the 5th transistor T5, the 6th transistor T6 and the 7th transistor T7,
In, driving transistor DT is used to determine the driving current of pixel-driving circuit, luminescent device OLED be used in response to driving current and
Luminescence display.
Specifically, in the present embodiment, the first transistor T1, second transistor T2, third transistor T3, the 4th crystal
Pipe T4, the 5th transistor T5, the 6th transistor T6, the 7th transistor and driving transistor DT are PMOS tube.It needs to illustrate
, the transistor in pixel-driving circuit provided in an embodiment of the present invention is PMOS tube, to avoid different types of crystalline substance
Otherness between body pipe is influenced caused by pixel-driving circuit.
In the present embodiment, reseting module 11 includes: third transistor T3 and the 4th transistor T4；Third transistor T3's
Control terminal is connect with the second driving signal S2, and the first end of third transistor T3 is connect with reset signal VI, third transistor T3
Second end connect with compensating module 12.
The control terminal of 4th transistor T4 is connect with the second driving signal S2, and the first end of the 4th transistor T4 and reset are believed
Number VI connection, the second end of the 4th transistor T4 are connect with high frequency control module 14.
Compensating module 12 includes: the first transistor T1, second transistor T2, driving transistor DT and storage capacitance Cst；It drives
The control terminal of dynamic transistor DT connects with the second end of storage capacitance Cst, the first end of second transistor T2, reseting module 11 respectively
It connects, the first end of driving transistor DT is connect with the second end of the first transistor T1, light emitting module 13 respectively, drives transistor DT
Second end connect respectively with the second end of second transistor T2, light emitting module 13；The first end of the first transistor T1 and
The control terminal of two-transistor T2 is connect with data-signal Vdata；The control terminal of the first transistor T1 and second transistor T2's
Control terminal is connect with the first driving signal S1；The first end of storage capacitance Cst is connect with light emitting module 13.
Light emitting module 13 includes: the 5th transistor T5, the 6th transistor T6 and luminescent device OLED；5th transistor T5's
Control terminal is connect with third driving signal S3, and the first end of the 5th transistor T5 is connect with the first power supply signal Vdd, the 5th crystal
The second end of pipe T5 is connect with the first end of driving transistor DT；The control terminal and third driving signal S3 of 6th transistor T6 connects
It connects, the first end of the 6th transistor T6 is connect with the second end of driving transistor DT, the second end and high frequency of the 6th transistor T6
Control module 14 connects；The anode of luminescent device OLED is connect with high frequency control module 14, the cathode of luminescent device OLED and
Two power supply signal VSS connections.
Further, the first transistor T1 is used to control the transmission of data-signal Vdata；Second transistor T2 is for controlling
Drive the control terminal of transistor DT and the on-off of second end；Third transistor T3 is transmitted to driving crystalline substance for controlling reset signal VI
The control terminal of body pipe DT；4th transistor T4 is transmitted to luminescent device OLED for controlling reset signal VI；5th transistor T5
The first end for being transmitted to driving transistor DT for controlling the first power supply signal Vdd；6th transistor T6 is described for that will come from
The driving current of driving transistor DT is transmitted to the luminescent device OLED；7th transistor T7 is for controlling luminescent device OLED
Luminous frequency.
Referring to Fig. 4, Fig. 4 is the timing diagram of the driving signal of pixel-driving circuit provided by the invention.In the present embodiment
In, the first driving signal S1, the second driving signal S2, third driving signal S3 and high-frequency controling signal S4 are by external timing control
Device processed provides.As shown in figure 4, the driver' s timing of the pixel-driving circuit includes: reseting stage, compensated stage and light emitting phase.
Wherein, in reseting stage, the control terminal and luminescent device OLED of driving transistor DT are resetted；In compensated stage, grab
It takes the threshold voltage of driving transistor DT and is stored on storage capacitance Cst；In light emitting phase, pixel-driving circuit generates driving
Electric current and under the control of high-frequency controling signal S4, is provided to luminescent device OLED with predeterminated frequency, for driving luminescent device
The luminescence display of OLED.
Specifically, the first driving signal S1 is high level signal in reseting stage, the second driving signal S2 is low level letter
Number, third driving signal S3 is high level signal, therefore, third transistor T3 and the 4th transistor T4 conducting, the first transistor
T1, second transistor T2, the 5th transistor T5 and the 6th transistor T6 are closed, at this point, reset signal is transmitted to driving transistor
The control terminal of DT, the second driving signal S2 are transmitted to the anode of luminescent device OLED.It should be noted that leading in reseting stage
The low potential for crossing reset signal VI resets the control terminal of driving transistor DT, passes through the low potential of the second driving signal S2
The anode of luminescent device OLED is resetted, the anode of luminescent device OLED can be made to be in lower current potential, facilitated
The reduction of the illuminated state, dark-state of luminescent device OLED, to improve contrast.
Secondly, the first driving signal S1 is low level signal in compensated stage, the second driving signal S2 is high level letter
Number, third driving signal S3 is high level signal, therefore, the first transistor T1 and second transistor T2 conducting, third transistor
T3, the 4th transistor T4, the 5th transistor T5 and the 6th transistor T6 are closed, data-signal Vdata by the first transistor T1,
Driving transistor DT and second transistor T2 is transmitted to the second end of storage capacitance Cst；First power supply signal Vdd transports to storage electricity
Hold the first end of Cst, driving transistor DT ends when the pressure difference of its control terminal and first end is equal to its threshold voltage vt h, that is,
The current potential for driving transistor DT control terminal is Vdata+ | Vth |.
In light emitting phase, the first driving signal S1 is high level signal, and the second driving signal S2 is high level signal, third
Driving signal S3 is low level signal, therefore, the 5th transistor T5 and the 6th transistor T6 conducting, the first transistor T1, second
Transistor T2, third transistor T3 and the 4th transistor T4 are closed, and the first power supply signal Vdd is transmitted to by the 5th transistor T5
Drive the first end of transistor DT, that is, the current potential of the first end of driving transistor DT is Vdd.At this point, driving crystal will be corresponded to
The driving current I of the gate source voltage Vgs of pipe DTOLEDIt is supplied to luminescent device OLED, luminescent device OLED is caused to shine, driving is brilliant
The driving current I that body pipe DT is generatedOLEDIt is indicated by following equation:
IOLED=k (Vgs-Vth)2=k (Vdata+Vth-Vdd-Vth)2=k (Vdata-Vdd)2。
In this equation, IOLEDExpression flows through the electric current of luminescent device OLED, and Vgs indicates the grid source of driving transistor DT
Voltage, Vth indicate that the threshold voltage of driving transistor DT, Vdata indicate that data-signal, k indicate constant.It can from equation
Out, because not considering the threshold voltage of driving transistor DT, but driving current is determined based on data-signal and power supply signal
IOLED, shine and show so luminescent device OLED can be stably driven with.
It should be noted that due in light emitting phase, the frequency of high-frequency controling signal between 24 hertz to 500 hertz it
Between, it, can be to avoid under the premise of not influencing luminescent device normal luminous that is, the 7th transistor is connected with preset frequency
Luminescent device continuous illumination.
Pixel-driving circuit provided by the invention, by increasing by a high frequency control module, the high frequency control module is in high frequency
Control signal control under control luminescent device luminous frequency, can be continued through to avoid luminescent material electric current cause decaying and
Generate ghost phenomena；Furthermore it is possible to eliminate influence of the threshold voltage of driving transistor to driving current, make the hair of luminescent device
Light is more uniform and stablizes.
The present invention also provides a kind of display panel, which includes above-described pixel-driving circuit, specifically may be used
Referring to more than, this will not be repeated here.
In conclusion although the present invention has been disclosed above in the preferred embodiment, but above preferred embodiment is not to limit
The system present invention, those skilled in the art can make various changes and profit without departing from the spirit and scope of the present invention
Decorations, therefore protection scope of the present invention subjects to the scope of the claims.
Claims (10)
1. a kind of pixel-driving circuit characterized by comprising reseting module, compensating module, light emitting module and high frequency control mould
Block；
The reseting module is for receiving the second driving signal and passing reset signal under the control of second driving signal
The compensating module and the light emitting module are transported to, to reset the compensating module and the light emitting module；
The compensating module is for receiving the first driving signal and data-signal being written under the control of first driving signal
And carry out threshold voltage compensation；
The light emitting module is for receiving third driving signal and shining under the control of the third driving signal；
The high frequency control module is for receiving high-frequency controling signal and under the control of the high-frequency controling signal described in control
The luminous frequency of light emitting module.
2. pixel-driving circuit according to claim 1, which is characterized in that the reseting module includes: third transistor
With the 4th transistor；
The control terminal of the third transistor is connect with second driving signal, the first end of the third transistor with it is described
Reset signal connection, the second end of the third transistor are connect with the high frequency control module；
It the control terminal of 4th transistor and is connect with second driving signal, the first end of the 4th transistor and institute
Reset signal connection is stated, the second end of the 4th transistor is connect with the compensating module.
3. pixel-driving circuit according to claim 2, which is characterized in that the compensating module include: the first transistor,
Second transistor, driving transistor and storage capacitance；
It is described driving transistor control terminal respectively with the second end of the storage capacitance, the first end of the second transistor,
Reseting module connection, the first end of the driving transistor respectively with the second end of the first transistor, described shine
The second end of module connection, the driving transistor is connect with the second end of the second transistor, the light emitting module respectively；
The first end of the first transistor and the control terminal of the second transistor are connect with the data-signal；
The control terminal of the first transistor and the control terminal of the second transistor are connect with first driving signal；
The first end of the storage capacitance is connect with the light emitting module.
4. pixel-driving circuit according to claim 3, which is characterized in that the light emitting module include: the 5th transistor,
6th transistor and luminescent device；
The control terminal of 5th transistor is connect with the third driving signal, the first end and first of the 5th transistor
Power supply signal connection, the second end of the 5th transistor are connect with the first end of the driving transistor；
The control terminal of 6th transistor is connect with the third driving signal, the first end of the 6th transistor with it is described
The second end connection of transistor is driven, the second end of the 6th transistor is connect with the high frequency control module；
The anode tap of the luminescent device is connect with the high frequency control module, and the cathode and second source of the luminescent device are believed
Number connection.
5. pixel-driving circuit according to claim 4, which is characterized in that the high frequency control module includes the 7th crystal
Pipe；
The control terminal of 7th transistor is connect with the high-frequency controling signal, the first end of the 7th transistor with it is described
The second end of 6th transistor connects, and the second end of the 7th transistor is connect with the anode of the luminescent device.
6. pixel-driving circuit according to claim 5, which is characterized in that the first transistor to the 7th crystal
Pipe is PMOS tube, and the driving transistor is PMOS tube.
7. pixel-driving circuit according to claim 6, which is characterized in that first driving signal, described second drive
Dynamic signal, the third driving signal and the high-frequency controling signal are provided by external sequence controller.
8. pixel-driving circuit according to claim 7, which is characterized in that the driver' s timing packet of the pixel-driving circuit
It includes:
Reseting stage resets the control terminal and the luminescent device of the driving transistor；
Compensated stage grabs the threshold voltage of the driving transistor and is stored in the storage capacitance；
Light emitting phase, pixel-driving circuit generates driving current and under the control of the high-frequency controling signal, with predeterminated frequency
It is provided to the luminescent device, for driving the luminescence display of the luminescent device.
9. pixel-driving circuit according to claim 1, which is characterized in that the frequency of the high-frequency controling signal is between 24
Hertz between 500 hertz.
10. a kind of display panel, which is characterized in that the display panel includes such as the described in any item pixels of claim 1-9
Driving circuit.
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| CN201810818268.4A CN108962143A (en) | 2018-07-24 | 2018-07-24 | A kind of pixel-driving circuit and display panel |
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| CN201810818268.4A CN108962143A (en) | 2018-07-24 | 2018-07-24 | A kind of pixel-driving circuit and display panel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2020155597A1 (en) * | 2019-01-28 | 2020-08-06 | Boe Technology Group Co., Ltd. | Pixel driving circuit, driving method thereof, and display device |
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| US11508299B2 (en) | 2019-01-28 | 2022-11-22 | Chongqing Boe Optoelectronics Technology Co., Ltd. | Pixel driving circuit, driving method thereof, and display device |
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Application publication date: 20181207 |
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