CN110060635A - Pixel circuit and OLED display panel - Google Patents
Pixel circuit and OLED display panel Download PDFInfo
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- CN110060635A CN110060635A CN201910275324.9A CN201910275324A CN110060635A CN 110060635 A CN110060635 A CN 110060635A CN 201910275324 A CN201910275324 A CN 201910275324A CN 110060635 A CN110060635 A CN 110060635A
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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
-
- 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
It includes: driving circuit that the present invention, which provides a kind of pixel circuit and OLED display panel, pixel circuit,；Illuminating circuit is arranged in a one-to-one correspondence with driving circuit, and illuminating circuit includes first electrode and second electrode, and within the display time of display frame period, the voltage of first electrode is greater than the voltage of second electrode；Delay circuit, for in the first preset time of display frame period, at least one electrode into first electrode and second electrode provides hold-off voltage, so that in the first preset time of display frame period, the voltage of first electrode is less than the voltage of second electrode, and the first preset time was located in the non-display time of display frame period；The current direction that the present invention passes through the change both ends luminescent device OLED in the first preset time, luminescent device OLED is placed in reverse bias, the state for restoring electronics, alleviates the chemical property drift of luminescent device OLED, and then improves luminescent device OLED service life short problem.
Description
Technical field
The present invention relates to field of display technology more particularly to a kind of pixel circuit and OLED display panels.
Background technique
Existing AMOLED (Active Matrix Organic Light Emitting Diode, the organic hair of active matrix
Optical diode) display panel due to more frivolous compared to liquid crystal display panel, has a wide range of applications.
The exploitation of large scale AMOLED panel generallys use 3T1C image element circuit framework as shown in Figure 1 at present, at one
In display frame period, as shown in Fig. 2, sweep circuit and induction line input high pressure, first switch transistor T1 and second first
Data voltage Vdata is written in the grid voltage Vg of switching transistor T2 conducting, driving transistor T3, drives the output of transistor T3
It holds voltage Vs that reference voltage Vref is written, later sweep circuit and induction line switchback low pressure, is based on storage capacitance Cst, driving
Transistor T3 maintains conducting, and luminescent device shines until the pressure difference Vgs that the capacitor Cst is provided is reduced to 0, a display frame week
In phase, the current direction of luminescent device OLED is by positive Vs to cathode VSS always, and the service life is shorter.
The service life of i.e. existing oled panel is to be improved.
Summary of the invention
The present invention provides a kind of pixel circuit and OLED display panel, shorter is asked with solving the existing oled panel service life
Topic.
In order to solve the above problem, technical solution provided by the invention is as follows:
The embodiment of the present invention provides a kind of pixel circuit, comprising:
Driving circuit；
Illuminating circuit is arranged in a one-to-one correspondence with driving circuit, and the illuminating circuit includes first electrode and second electrode,
In the display time of display frame period, the voltage of the first electrode is greater than the voltage of the second electrode；
Delay circuit, in the first preset time of the display frame period, Xiang Suoshu first electrode and described
At least one electrode in second electrode provides hold-off voltage, so that in the first preset time of the display frame period, institute
The voltage for stating first electrode is less than the voltage of the second electrode, and first preset time is located at the non-of the display frame period
It shows in the time.
It is described that circuit is delayed to be electrically connected with the first electrode in pixel circuit provided by the invention, for described
In first predetermined time, Xiang Suoshu first electrode provides hold-off voltage；Within first predetermined time, the second electrode is
Low-potential voltage, the hold-off voltage are less than the low-potential voltage.
It is described that circuit is delayed to be electrically connected with the second electrode in pixel circuit provided by the invention, for described
In first predetermined time, Xiang Suoshu second electrode provides hold-off voltage；Within first predetermined time, the first electrode is
Low-potential voltage, the hold-off voltage are greater than the low-potential voltage.
It is described that circuit is delayed to delay circuit and second to delay circuit including first in pixel circuit provided by the invention,
Described first delays circuit to be electrically connected with the first electrode, is used for the Xiang Suoshu first electrode within first predetermined time
First hold-off voltage is provided；Described second delays circuit to be electrically connected with the second electrode, in first predetermined time
Interior, Xiang Suoshu second electrode provides the second hold-off voltage, and first hold-off voltage is less than second hold-off voltage.
In pixel circuit provided by the invention, the pixel circuit further includes anti-bias circuit, in the display frame
In second preset time in period, the driving transistor of Xiang Suoshu driving circuit provides reversed bias voltage, so that the driving crystal
Pipe is in reverse-biased, and second preset time was located in the non-display time of the display frame period.
In pixel circuit provided by the invention, the anti-bias circuit includes the first anti-bias circuit and the second anti-bias circuit,
First anti-bias circuit is electrically connected with the grid of the driving transistor, is used for the Xiang Suoshu within second predetermined time
Grid provides the first reversed bias voltage；Second anti-bias circuit is electrically connected with the input terminal of the driving transistor, in institute
It states in the second predetermined time, Xiang Suoshu input terminal provides the second reversed bias voltage；Within second predetermined time, the driving is brilliant
The output end of body pipe is low-potential voltage, and first reversed bias voltage and second reversed bias voltage are respectively less than the low potential electricity
Pressure.
In pixel circuit provided by the invention, the anti-bias circuit includes third anti-bias circuit and the 4th anti-bias circuit,
The third anti-bias circuit is electrically connected with the grid of the driving transistor, is used for the Xiang Suoshu within second predetermined time
Grid provides third reversed bias voltage；4th anti-bias circuit is electrically connected with the output end of the driving transistor, in institute
It states in the second predetermined time, Xiang Suoshu output end provides the 4th reversed bias voltage；Within second predetermined time, the driving is brilliant
The input terminal of body pipe is low-potential voltage, and the third reversed bias voltage and the low-potential voltage are all larger than the 4th reverse-biased electricity
Pressure.
In pixel circuit provided by the invention, the pixel circuit further includes positive volt circuit, in the display frame
In the third preset time in period, in the first switch transistor and second switch transistor of Xiang Suoshu driving circuit at least one
A switching transistor provides forward voltage, so that at least one described switching transistor is in barotropic state, the third is default
Time was located in the non-display time of the display frame period.
In pixel circuit provided by the invention, the pixel circuit includes driving transistor, first switch transistor, the
Two switching transistors and storage capacitance, third switching transistor, the 4th switching transistor；The first switch transistor it is defeated
Outlet, the output end of the third switching transistor, the first electrode of the storage capacitance and the grid for driving transistor
The input terminal electrical connection of pole electrical connection, the grid of the first switch transistor and the third switching transistor, described second
The output end of switching transistor, the output end of the 4th switching transistor, the output end of the driving transistor, the storage
The second electrode of capacitor and the electrical connection of the first electrode of the illuminating circuit, the grid of the second switch transistor and institute
The input terminal electrical connection of the 4th switching transistor is stated, the grid of the third switching transistor and the 4th switching transistor
The input terminal of grid electrical connection, the driving transistor is electrically connected with the first current potential of power supply, the second electrode of the illuminating circuit
It is electrically connected with the second current potential of power supply.
The embodiment of the present invention also provides a kind of OLED display panel comprising pixel array, the pixel array include extremely
A few pixel circuit, the pixel circuit include:
Driving circuit；
Illuminating circuit is arranged in a one-to-one correspondence with driving circuit, and the illuminating circuit includes first electrode and second electrode,
In the display time of display frame period, the voltage of the first electrode is greater than the voltage of the second electrode；
Delay circuit, in the first preset time of the display frame period, Xiang Suoshu first electrode and described
At least one electrode in second electrode provides hold-off voltage, so that in the first preset time of the display frame period, institute
The voltage for stating first electrode is less than the voltage of the second electrode, and first preset time is located at the non-of the display frame period
It shows in the time.
The invention has the benefit that
It includes: driving circuit that the present invention, which provides a kind of pixel circuit and OLED display panel, pixel circuit,；Shine electricity
Road is arranged in a one-to-one correspondence with driving circuit, and illuminating circuit includes first electrode and second electrode, in the display of display frame period
In, the voltage of first electrode is greater than the voltage of second electrode；Delay circuit, for the first preset time in display frame period
Interior, at least one electrode into first electrode and second electrode provides hold-off voltage, so that the first of display frame period
In preset time, the voltage of first electrode is less than the voltage of second electrode, and the first preset time is located at the non-aobvious of display frame period
Show in the time.By changing the current direction at the both ends luminescent device OLED in the first preset time, i.e., by luminescent device OLED
It is placed in reverse bias, restores the state of electronics, alleviates the chemical property drift of luminescent device OLED, and then is improved luminous
Device OLED service life short problem.
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 equivalent circuit diagram of the pixel circuit of existing OLED display panel；
Fig. 2 is the working timing figure of the pixel circuit of existing OLED display panel；
Fig. 3 is a kind of equivalent circuit diagram of the pixel circuit of OLED display panel provided in an embodiment of the present invention；
Fig. 4 is the first partial equivalent circuit diagram of the pixel circuit of OLED display panel provided in an embodiment of the present invention；
Fig. 5 is the second local equivalent circuit diagram of the pixel circuit of OLED display panel provided in an embodiment of the present invention；
Fig. 6 is a kind of working timing figure of the pixel circuit of OLED display panel provided in an embodiment of the present invention.
Specific embodiment
Below in conjunction with specific embodiments of the present invention, to the technical side in embodiment of the present invention and/or embodiment
Case carries out clear, complete description, it is clear that, embodiment and/or embodiment disclosed below is only the present invention
A part of embodiment and/or embodiment, rather than whole embodiments and/or embodiment.Based on the implementation in the present invention
Scheme and/or embodiment, those of ordinary skill in the art are not making the front lower every other reality obtained of creative work
Scheme and/or embodiment are applied, the scope of the present invention is belonged to.
The direction term that the present invention is previously mentioned, for example, [on], [under], [left side], [right side], [preceding], [rear], [interior], [outer],
[side] etc. is only the direction with reference to annexed drawings.Therefore, the direction term used be to illustrate and understand the present invention, rather than
To limit the present invention.Term " first ", " second " etc. are used for description purposes only, and should not be understood as indicating or implying its phase
To importance or implicitly indicate the quantity of indicated technical characteristic.The feature for defining " first ", " second " etc. as a result, can
To explicitly or implicitly include one or more of the features.
Referring to Figures 1 and 2, in existing OLED pixel circuit, in a display frame period, sweep circuit first
The grid of switching transistor T1 provides high pressure Vscan, and induction line provides high pressure for the grid of second switch transistor T2
Vsense, the first switch transistor T1 and the second switch transistor T2 conducting, drive the grid voltage of transistor T3
Vg be written data voltage Vdata, driving transistor T3 output end voltage Vs be written reference voltage Vref, later sweep circuit and
Induction line switchback low pressure is based on storage capacitance Cst, and the driving transistor T3 maintains conducting, and luminescent device OLED shines straight
To the capacitor Cst provide pressure difference Vgs be reduced to 0, within the display time, the flow direction of electric current be always from positive Vs to
Cathode VSS, i.e., the described OLED are constantly in forward bias, the state of trapped electron, and prolonged forward bias can bring OLED
Chemical property drift, in turn resulting in the OLED service life declines.
For the drift of OLED chemical property existing for the above existing OLED display panel, in turn resulting in the OLED service life declines
The problem of, the present invention, which provides a kind of pixel circuit, can solve this problem.
In one embodiment, as shown in figure 3, pixel circuit provided by the invention, comprising:
Driving circuit 1；
Illuminating circuit 2 is arranged in a one-to-one correspondence with the driving circuit 1, and the illuminating circuit 2 includes first electrode 21 and the
Two electrodes 22, within the display time of the display frame period, the voltage of the first electrode 21 is less than the second electrode 22
Voltage；
Delay circuit 3, in the first preset time of display frame period, Xiang Suoshu first electrode 21 and described
At least one electrode in two electrodes 22 provides hold-off voltage, so that in the first preset time of the display frame period, institute
The voltage for stating first electrode 21 is less than the voltage of the second electrode 22, and first preset time is located at the display frame period
The non-display time in.
It include: driving circuit the present embodiment provides a kind of pixel circuit；Illuminating circuit is set with driving circuit one-to-one correspondence
It sets, illuminating circuit includes first electrode and second electrode, and within the display time of display frame period, the voltage of first electrode is greater than
The voltage of second electrode；Delay circuit, in the first preset time of display frame period, to first electrode and the second electricity
At least one electrode in extremely provides hold-off voltage, so that in the first preset time of display frame period, the electricity of first electrode
Pressure is less than the voltage of second electrode, and the first preset time was located in the non-display time of display frame period.By default first
The current direction for changing the both ends luminescent device OLED in time, i.e., be placed in reverse bias for luminescent device OLED, restore electronics
State, alleviates the chemical property drift of luminescent device OLED, and then improves luminescent device OLED service life short problem.
In one embodiment, described that circuit 3 is delayed to be electrically connected with the first electrode 21 as shown in a in Fig. 4,
It is described that circuit 3 is delayed to input high pressure Vdelay to the grid of transistor T4 in first predetermined time, drive transistor T4 to lead
It is logical, hold-off voltage Vdel is inputted to the input terminal of transistor T4, so that hold-off voltage Vdel is written in the first electrode 21, it is described
Voltage VSS is written in second electrode 22, and the Vdel is less than the VSS, in this way, the potential of luminescent device OLED is second electricity
Pole 22 is higher than the first electrode 21, and current direction is that the second electrode 22 flows to the first electrode 21, i.e., the described OLED
In reversely to biasing, the state of electronics is restored, the chemical property drift of OLED is alleviated, and then it is short to improve the OLED service life
The problem of.
In one embodiment, described that circuit 3 is delayed to be electrically connected with the second electrode 22 as shown in the b in Fig. 4,
It is described that circuit 3 is delayed to input high pressure Vdelay to the grid of transistor T4 in first predetermined time, drive transistor T4 to lead
It is logical, hold-off voltage Vdel is inputted to the input terminal of transistor T4, so that hold-off voltage Vdel is written in the second electrode 22, it is described
Voltage Vs is written in first electrode 21, and the Vdel is greater than the Vs, in this way, the potential of luminescent device OLED is the second electrode
22 are higher than the first electrode 21, and current direction is that the second electrode 22 flows to the first electrode 21, i.e., at the described OLED
In reversely to biasing, restoring the state of electronics, the chemical property drift of OLED is alleviated, and then it is short to improve the OLED service life
Problem.
In one embodiment, described that circuit 3 is delayed to delay circuit 31 and second to prolong including first as shown in the c in Fig. 4
Slow circuit 32, described first delays circuit 31 to be electrically connected with the first electrode 21, within first predetermined time, described the
One delays circuit 31 to input high pressure Vdelay to the grid of transistor T4, drives the transistor T4 to be connected, Xiang Suoshu transistor
The input terminal of T4 inputs the first hold-off voltage Vdel1, so that the first hold-off voltage Vdel1 is written in the first electrode 21；
Described second delays circuit 32 to be electrically connected with the second electrode 22, and within first predetermined time, described first delays electricity
Road 32 inputs high pressure Vdelay to the grid of transistor T5, drives the transistor T5 to be connected, the input of Xiang Suoshu transistor T5
The second hold-off voltage Vdel2 of end input, so that the second hold-off voltage Vdel2 is written in the second electrode 22；Described first
Hold-off voltage Vdel1 is less than the second hold-off voltage Vdel2, and current direction is that the second electrode 22 flows to first electricity
Pole 21, i.e., the described OLED are in reversely to biasing, restore the state of electronics, alleviate the chemical property drift of OLED, in turn
Improve OLED service life short problem.
For driving transistor T3, referring to Figures 1 and 2, in existing OLED pixel circuit, in a display frame
In period, sweep circuit provides high pressure Vscan for the grid of first switch transistor T1, and induction line is second switch transistor
The grid of T2 provides high pressure Vsense, the first switch transistor T1 and the second switch transistor T2 conducting, and driving is brilliant
Data voltage Vdata is written in the grid voltage Vg of body pipe T3, and reference voltage is written in the output end voltage Vs of driving transistor T3
Vref, sweep circuit and induction line switchback low pressure, are based on storage capacitance Cst later, and the driving transistor T3 maintains conducting,
Until the pressure difference Vgs that the storage capacitance Cst is provided is reduced to 0, within the display time, the driving transistor T3 is always
In forward bias, the state of trapped electron, prolonged forward bias can be such that the threshold voltage of the driving transistor T3 increases
Greatly, to reduce the service life of the driving transistor T3.
Increase for driving transistor T3 threshold voltage existing for the above existing OLED display panel, the driving in turn resulted in
The problem of transistor T3 service life declines, pixel circuit provided by the invention further include that anti-bias circuit 4 as shown in Figure 5 can be alleviated
This problem.The anti-bias circuit 4 is used in the second preset time of the display frame period, to the driving transistor T3
Reversed bias voltage is provided, so that the driving transistor T3 is in reverse-biased, second preset time is located at the display frame
In the non-display time in period.
In one embodiment, as shown in a in Fig. 5, the anti-bias circuit 4 includes that the first anti-bias circuit 41 and second is anti-
Inclined circuit 42, first anti-bias circuit 41 is electrically connected with the grid of the driving transistor T3, in second predetermined time
Interior, the reverse-biased route provides high voltage Vreverse to the grid of transistor T6, and the transistor T6 conducting drives the drive
Voltage Vrev1 is written in the grid of dynamic transistor T3；The output end electricity of second anti-bias circuit 42 and the driving transistor T3
Connection, within second predetermined time, the reverse-biased route provides high voltage Vreverse to the grid of transistor T7, described
Transistor T7 conducting drives the output end of the driving transistor T3 that voltage Vrev2 is written；Within second predetermined time,
The input terminal of the driving transistor T3 is low-potential voltage, and the Vrev1 and the low-potential voltage are respectively less than described
Vrev2, i.e., the described driving transistor T3 are in reverse bias, restore the state of electronics, alleviate the driving transistor T3 long
Time forward bias leads to the problem of threshold voltage increase, to increase the service life of driving transistor.
In one embodiment, as shown in the b in Fig. 5, the anti-bias circuit 4 includes that third anti-bias circuit 43 and the 4th are anti-
Inclined circuit 44, the third anti-bias circuit 43 is electrically connected with the grid of the driving transistor T3, in second predetermined time
Interior, the reverse-biased route provides high voltage Vreverse to the grid of reverse bias transistor T6, and the reverse bias transistor T6 conducting is driven
Move the grid write-in voltage Vrev3 of the driving transistor T3；4th anti-bias circuit 44 is with the driving transistor T3's
Input terminal electrical connection, within second predetermined time, the reverse-biased route provides high voltage to the grid of reverse bias transistor T7
Vreverse, the reverse bias transistor T7 conducting drive the input terminal of the driving transistor T3 that voltage Vrev4 is written；Institute
It states in the second predetermined time, the output end of the driving transistor T3 is low-potential voltage, and the Vrev3 and the Vrev4 are equal
Less than the low-potential voltage, i.e., the described driving transistor T3 is in reverse bias, restores the state of electronics, alleviates described
Driving transistor T3 long-time forward bias leads to the problem of threshold voltage increase, to increase the service life of driving transistor.
In one embodiment, as shown in the c in Fig. 5, the anti-bias circuit 4 includes that the 5th anti-bias circuit 45 and the 6th is anti-
Inclined circuit 46, the 5th anti-bias circuit 45 are electrically connected with the output end of the driving transistor T3, in the described second pre- timing
In, the reverse-biased route provides high voltage Vreverse to the grid of reverse bias transistor T6, and the reverse bias transistor T6 is connected,
Drive the output end write-in voltage Vrev5 of the driving transistor T3；6th anti-bias circuit 46 and the driving transistor
The input terminal of T3 is electrically connected, and within second predetermined time, the reverse-biased route provides high to the grid of reverse bias transistor T7
Voltage Vreverse, the reverse bias transistor T7 conducting drive the input terminal of the driving transistor T3 that voltage Vrev6 is written；
Within second predetermined time, the grid of the driving transistor T3 is low-potential voltage, the low-potential voltage and described
Vrev6 is respectively less than the Vrev5, i.e., the described driving transistor T3 is in reverse bias, restores the state of electronics, alleviates institute
It states driving transistor T3 long-time forward bias and leads to the problem of threshold voltage increase, to increase the longevity of driving transistor
Life.
In one embodiment, as shown in the d in Fig. 5, the anti-bias circuit 4 includes that the 7th anti-bias circuit the 47, the 8th is anti-
Inclined circuit 48 and the 9th anti-bias circuit 49, the 7th anti-bias circuit 47 are electrically connected with the grid of the driving transistor T3,
In second predetermined time, the reverse-biased route provides high voltage Vreverse to the grid of reverse bias transistor T6, described anti-
Monotectic pipe T6 conducting drives the grid of the driving transistor T3 that voltage Vrev7 is written；8th anti-bias circuit 48 and institute
The output end electrical connection of driving transistor T3 is stated, within second predetermined time, the reverse-biased route is to reverse bias transistor T7
Output end high voltage Vreverse is provided, reverse bias transistor T7 conducting drives the output end of the driving transistor T3
Voltage Vrev8 is written；9th anti-bias circuit 49 is electrically connected with the input terminal of the driving transistor T3, pre- described second
In fixing time, the reverse-biased route provides high voltage Vreverse, the reverse bias transistor to the output end of reverse bias transistor T8
T8 conducting drives the output end of the driving transistor T3 that voltage Vrev9 is written；The Vrev7 and the Vrev9 are respectively less than institute
Vrev8 is stated, i.e., the described driving transistor T3 is in reverse bias, restores the state of electronics, alleviates the driving transistor T3
Long-time forward bias leads to the problem of threshold voltage increase, to increase the service life of driving transistor.
For first switch transistor T1 and second switch transistor T2, referring to Figures 1 and 2, in existing OLED
In pixel circuit, within the display time of a display frame period, sweep circuit provides for the grid of first switch transistor T1
High pressure Vscan, induction line provide high pressure Vsense, the first switch transistor T1 for the grid of second switch transistor T2
It is connected with the second switch transistor T2, data voltage Vdata is written in the grid voltage Vg of driving transistor T3, drives crystal
Reference voltage Vref is written in the output end voltage Vs of pipe T3, later sweep circuit and induction line switchback low pressure, i.e., week hereafter
In time phase, the first switch transistor T1 and the second switch transistor T2 are constantly in negatively biasing state, long
The negatively biasing negative sense drift that will cause electronics of time, can lose when negative sense drift reaches the switching transistor described to a certain degree
The effect of switch.
Cause to lose out for electronics negative sense drift existing for switching transistor existing for the above existing OLED display panel
The problem of pass acts on, pixel circuit provided by the invention further includes that positive volt circuit can alleviate this problem.The positive volt circuit
For in the third preset time of the display frame period, Xiang Suoshu first switch transistor T1 and second switch transistor T2
In at least one switching transistor provide forward voltage so that at least one described switching transistor is in barotropic state, institute
Third preset time is stated to be located in the non-display time of the display frame period.
In one embodiment, the positive volt circuit includes the first positive volt circuit and the second positive volt circuit, and described first just
Volt circuit is electrically connected with the grid of the first switch transistor, within the third predetermined time, Xiang Suoshu grid to be mentioned
For the first positive pressure voltage；The second positive volt circuit is electrically connected with the input terminal of the first switch transistor, for described
In the third predetermined time, Xiang Suoshu input terminal provides the second positive pressure voltage；Within the third predetermined time, the first switch
The output end of transistor is low-potential voltage, and the first positive pressure voltage and the second positive pressure voltage are all larger than the low potential
Voltage.
In one embodiment, the positive volt circuit includes the positive volt circuit of third and the 4th positive volt circuit, and the third is just
Volt circuit is electrically connected with the grid of the first switch transistor, within the third predetermined time, Xiang Suoshu grid to be mentioned
For third positive pressure voltage；The 4th positive volt circuit is electrically connected with the output end of the first switch transistor, for described
In the third predetermined time, Xiang Suoshu output end provides the 4th positive pressure voltage；Within the third predetermined time, the first switch
The input terminal of transistor is low-potential voltage, and the third positive pressure voltage and the low-potential voltage are all larger than the 4th positive pressure
Voltage.
In one embodiment, the positive volt circuit includes the 5th positive volt circuit and the 6th positive volt circuit, and the described 5th just
Volt circuit is electrically connected with the input terminal of the first switch transistor, is used within the third predetermined time, to the input
End provides the 5th positive pressure voltage；The second positive volt circuit is electrically connected with the output end of the first switch transistor, is used for
In the third predetermined time, Xiang Suoshu output end provides the 6th positive pressure voltage；Within the third predetermined time, described first
The grid of switching transistor is low-potential voltage, and the 5th positive pressure voltage and the low-potential voltage are being all larger than the described 6th just
Piezoelectricity pressure.
In one embodiment, the positive volt circuit includes the 7th positive volt circuit, the 8th positive volt circuit and the 9th positive piezoelectricity
Road, the first positive volt circuit are electrically connected with the grid of the first switch transistor, are used within the third predetermined time,
The 7th positive pressure voltage is provided to the grid；The 8th positive volt circuit and the input terminal of the first switch transistor are electrically connected
It connects, within the third predetermined time, Xiang Suoshu input terminal to provide the 8th positive pressure voltage；The 9th positive volt circuit and institute
The output end electrical connection for stating first switch transistor, within the third predetermined time, Xiang Suoshu output end to provide the 9th
Positive pressure voltage, the 7th positive pressure voltage and the 8th positive pressure voltage are all larger than the 9th positive pressure voltage.
In one embodiment, the positive volt circuit include the tenth positive volt circuit and the 11st positive volt circuit, the described tenth
Positive volt circuit is electrically connected with the grid of the second switch transistor, is used for the Xiang Suoshu grid within the third predetermined time
The tenth positive pressure voltage is provided, the 11st positive volt circuit is electrically connected with the input terminal of the second switch transistor, is used for
In the third predetermined time, Xiang Suoshu input terminal provides the 11st positive pressure voltage；Within the third predetermined time, described
The output end of two switching transistors is low-potential voltage, and the tenth positive pressure voltage and the 11st positive pressure voltage are all larger than institute
State low-potential voltage.
In one embodiment, the positive volt circuit includes the 12nd positive volt circuit and the 13rd positive volt circuit, and described the
12 positive volt circuits are electrically connected with the grid of the second switch transistor, are used for the Xiang Suoshu within the third predetermined time
Grid provides the 12nd positive pressure voltage；The 13rd positive volt circuit is electrically connected with the output end of the second switch transistor,
For within the third predetermined time, Xiang Suoshu output end to provide the 13rd positive pressure voltage；Within the third predetermined time,
The input terminal of the second switch transistor is low-potential voltage, and the 12nd positive pressure voltage and the low-potential voltage are big
In the 13rd positive pressure voltage.
In one embodiment, the positive volt circuit includes the 14th positive volt circuit and the 15th positive volt circuit, and described the
14 positive volt circuits are electrically connected with the input terminal of the second switch transistor, are used within the third predetermined time, to institute
It states input terminal and the 14th positive pressure voltage is provided；The 15th positive volt circuit and the output end of the second switch transistor are electrically connected
It connects, within the third predetermined time, Xiang Suoshu output end to provide the 15th positive pressure voltage；In the third predetermined time
Interior, the grid of the second switch transistor is low-potential voltage, and the 14th positive pressure voltage and the low-potential voltage are equal
Greater than the 15th positive pressure voltage.
In one embodiment, the positive volt circuit includes the 16th positive volt circuit, the 17th positive volt circuit and the 18th
Positive volt circuit, the 16th positive volt circuit are electrically connected with the grid of the second switch transistor, for pre- in the third
In fixing time, Xiang Suoshu grid provides the 16th positive pressure voltage；The 17th positive volt circuit and the second switch transistor
Input terminal electrical connection, within the third predetermined time, Xiang Suoshu input terminal provides the 17th positive pressure voltage；Described
18 positive volt circuits are electrically connected with the output end of the second switch transistor, are used within the third predetermined time, to institute
It states output end and the 18th positive pressure voltage is provided, the 16th positive pressure voltage and the 17th positive pressure voltage are all larger than described the
18 positive pressure voltages.
The working principle of the positive volt circuit is similar with the working principle of the reversed bias voltage, can refer to the embodiment of Fig. 5,
No longer mapping is introduced herein.
First predetermined time, second predetermined time and the third predetermined time described above can be respectively different
Time can also can be all the same time with two of them for the same time with three.
Explanation is further annotated to pixel circuit of the invention now in conjunction with specific embodiment.
As shown in figure 3, being a kind of pixel circuit figure of embodiment of the invention, the pixel circuit includes first switch crystalline substance
Body pipe T1, second switch transistor T2, driving transistor T3 and storage capacitance Cst, third switching transistor T4, the 4th switch
Transistor T5；The output end of the first switch transistor T1, the output end of the third switching transistor T4, storage electricity
Hold Cst first electrode and it is described driving transistor T3 grid electrical connection, the grid of the first switch transistor T1 and
The input terminal of the third switching transistor T4 is electrically connected, the output end of the second switch transistor T2, the 4th switch
The output end of transistor T5, the driving output end of transistor T3, the second electrode of the storage capacitance Cst and described
The first electrode of illuminating circuit is electrically connected, and the grid of the second switch transistor T2 and the 4th switching transistor T5's is defeated
Enter end electrical connection, the grid electrical connection of the grid and the 4th switching transistor T5 of the third switching transistor T4 is described
The input terminal of driving transistor T3 is electrically connected with the first current potential of power supply, the second electrode and the second current potential of power supply of the illuminating circuit
Electrical connection；The third switching transistor T4 is equivalent to the above and delays circuit, the anti-bias circuit and the forward circuit,
The 4th switching transistor T5 is equivalent to anti-bias circuit described above and the forward circuit.
As shown in fig. 6, for present invention working timing figure corresponding with pixel circuit figure shown in Fig. 3.One display frame week
Phase include display time Display and non-display time Nondisplay, the non-display time include again the first predetermined time ST1,
Second predetermined time ST2 and third predetermined time ST3, first predetermined time ST1, second predetermined time ST2 and institute
Stating third predetermined time ST3 is the same time.
Within the display time, sweep circuit provides 22V scanning voltage for the grid of first switch transistor T1
22V data voltage Vdata is written in Vscan, the first switch transistor T1 conducting, the grid voltage Vg of driving transistor T3；
Induction line provides 22V induced voltage Vsense for the grid of second switch transistor T2, and the second switch transistor T2 is led
Logical, 0V reference voltage Vref is written in the output end voltage Vs of the driving transistor T3；Delaying route is third switching transistor
Grid offer -8V the low pressure Vdelay, the third switching transistor T4 of the grid of T4 and the 4th switching transistor T5 and described
4th switching transistor T5 is in off-state.
The sweep circuit and the induction line are switched to -8V low pressure later, the first switch transistor T1 and described
Second switch transistor T2 is disconnected；Based on storage capacitance Cst, the driving transistor T3 maintains conducting, luminescent device OLED hair
Light is until the pressure difference Vgs that the storage capacitance Cst is provided is reduced to 0.
It is described that circuit is delayed to cut 22V high pressure by low pressure in the first predetermined time ST1 of the unreality time
Vdelay, the third switching transistor T4 and the 4th switching transistor T5 conducting, the output of the driving transistor T3
Hold voltage Vs write-in -3V induced voltage Vsense, the grid voltage Vg write-in -8V scanning voltage of the driving transistor T3
Vscan。
The first electrode voltage Vs of the luminescent device OLED is -3V, and second electrode voltage VSS is 0V, and current direction is
The second electrode 22 flows to the first electrode 21, i.e., the described OLED is in reverse bias, restores the state of electronics, alleviate
The chemical property of OLED drifts about, and then improves OLED service life short problem.
The grid voltage Vg of the driving transistor T3 is -8V, and output end voltage Vs is -3V, and grid output end voltage is greater than
0, i.e., the described driving transistor T3 is in reverse bias, restores the state of electronics, alleviates the driving transistor T3 for a long time
Forward bias leads to the problem of threshold voltage increase, to increase the service life of driving transistor.
The grid voltage Vscan of the first switch transistor T1 is -8V, and input terminal voltage Vdata is 0V, output end electricity
Pressure Vg be -8V, grid-output voltage be 0V, i.e., the described first switch transistor T1 be it is non-negatively biasing, restore the shape of electronics
State, alleviating the first switch transistor T1 electronics negative sense drift leads to the problem of losing on-off action.
The grid voltage Vsense of the second switch transistor T2 is -3V, and input terminal voltage Vref is 0V, output end electricity
Pressure Vs be -3V, grid-output voltage be 0V, i.e., the described second switch transistor T2 be it is non-negatively biasing, restore the shape of electronics
State, alleviating the second switch transistor T2 electronics negative sense drift leads to the problem of losing on-off action.
Meanwhile the present invention also provides a kind of OLED display panels comprising pixel array, the pixel array include at least
One pixel circuit, the pixel circuit include:
Driving circuit；
Illuminating circuit is arranged in a one-to-one correspondence with driving circuit, and the illuminating circuit includes first electrode and second electrode,
In the display time of display frame period, the voltage of the first electrode is greater than the voltage of the second electrode；
Delay circuit, in the first preset time of the display frame period, Xiang Suoshu first electrode and described
At least one electrode in second electrode provides hold-off voltage, so that in the first preset time of the display frame period, institute
The voltage for stating first electrode is less than the voltage of the second electrode, and first preset time is located at the non-of the display frame period
It shows in the time.
The present embodiment provides a kind of OLED display panels comprising pixel array, the pixel array include at least one
Pixel circuit, pixel circuit include: driving circuit；Illuminating circuit is arranged in a one-to-one correspondence with driving circuit, and illuminating circuit includes the
One electrode and second electrode, within the display time of display frame period, the voltage of first electrode is greater than the voltage of second electrode；Prolong
Slow circuit, in the first preset time of display frame period, at least one of first electrode and second electrode electricity
Pole provides hold-off voltage, so that the voltage of first electrode is less than second electrode in the first preset time of display frame period
Voltage, the first preset time were located in the non-display time of display frame period.By changing photophore in the first preset time
The current direction at the both ends part OLED, i.e., be placed in reverse bias for luminescent device OLED, restores the state of electronics, alleviates photophore
The chemical property of part OLED drifts about, and then improves luminescent device OLED service life short problem.
According to above-described embodiment:
It includes: driving circuit that the present invention, which provides a kind of pixel circuit and OLED display panel, pixel circuit,；Shine electricity
Road is arranged in a one-to-one correspondence with driving circuit, and illuminating circuit includes first electrode and second electrode, in the display of display frame period
In, the voltage of first electrode is greater than the voltage of second electrode；Delay circuit, for the first preset time in display frame period
Interior, at least one electrode into first electrode and second electrode provides hold-off voltage, so that the first of display frame period
In preset time, the voltage of first electrode is less than the voltage of second electrode, and the first preset time is located at the non-aobvious of display frame period
Show in the time.By changing the current direction at the both ends luminescent device OLED in the first preset time, i.e., by luminescent device OLED
It is placed in reverse bias, restores the state of electronics, alleviates the chemical property drift of luminescent device OLED, and then is improved luminous
Device OLED service life short problem.
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 circuit characterized by comprising
Driving circuit；
Illuminating circuit is arranged in a one-to-one correspondence with driving circuit, and the illuminating circuit includes first electrode and second electrode, is being shown
In the display time in frame period, the voltage of the first electrode is greater than the voltage of the second electrode；
Delay circuit, in the first preset time of the display frame period, Xiang Suoshu first electrode and described second
At least one electrode in electrode provides hold-off voltage, so that in the first preset time of the display frame period, described the
The voltage of one electrode is less than the voltage of the second electrode, and first preset time is located at the non-display of the display frame period
In time.
2. pixel circuit as described in claim 1, which is characterized in that it is described that circuit is delayed to be electrically connected with the first electrode,
For within first predetermined time, Xiang Suoshu first electrode to provide hold-off voltage；It is described within first predetermined time
Second electrode is low-potential voltage, and the hold-off voltage is less than the low-potential voltage.
3. pixel circuit as described in claim 1, which is characterized in that it is described that circuit is delayed to be electrically connected with the second electrode,
For within first predetermined time, Xiang Suoshu second electrode to provide hold-off voltage；It is described within first predetermined time
First electrode is low-potential voltage, and the hold-off voltage is greater than the low-potential voltage.
4. pixel circuit as described in claim 1, which is characterized in that described that circuit is delayed to delay circuit and second including first
Delay circuit, described first delays circuit to be electrically connected with the first electrode, is used for the Xiang Suoshu within first predetermined time
First electrode provides the first hold-off voltage；Described second delays circuit to be electrically connected with the second electrode, for described first
In predetermined time, Xiang Suoshu second electrode provides the second hold-off voltage, and first hold-off voltage is less than described second and delays electricity
Pressure.
5. pixel circuit as described in claim 1, which is characterized in that the pixel circuit further includes anti-bias circuit, is used for
In second preset time of the display frame period, the driving transistor of Xiang Suoshu driving circuit provides reversed bias voltage, so that institute
It states driving transistor and is in reverse-biased, second preset time was located in the non-display time of the display frame period.
6. pixel circuit as claimed in claim 5, which is characterized in that the anti-bias circuit includes the first anti-bias circuit and second
Anti-bias circuit, first anti-bias circuit is electrically connected with the grid of the driving transistor, in second predetermined time
Interior, Xiang Suoshu grid provides the first reversed bias voltage；Second anti-bias circuit is electrically connected with the input terminal of the driving transistor,
For within second predetermined time, Xiang Suoshu input terminal to provide the second reversed bias voltage；Within second predetermined time, institute
The output end for stating driving transistor is low-potential voltage, and first reversed bias voltage and second reversed bias voltage are respectively less than described
Low-potential voltage.
7. pixel circuit as claimed in claim 5, which is characterized in that the anti-bias circuit includes third anti-bias circuit and the 4th
Anti-bias circuit, the third anti-bias circuit is electrically connected with the grid of the driving transistor, in second predetermined time
Interior, Xiang Suoshu grid provides third reversed bias voltage；4th anti-bias circuit is electrically connected with the output end of the driving transistor,
For within second predetermined time, Xiang Suoshu output end to provide the 4th reversed bias voltage；Within second predetermined time, institute
The input terminal for stating driving transistor is low-potential voltage, and the third reversed bias voltage and the low-potential voltage are all larger than described the
Four reversed bias voltages.
8. pixel circuit as described in claim 1, which is characterized in that the pixel circuit further includes positive volt circuit, is used for
In the third preset time of the display frame period, the first switch transistor and second switch transistor of Xiang Suoshu driving circuit
In at least one switching transistor provide forward voltage so that at least one described switching transistor is in barotropic state, institute
Third preset time is stated to be located in the non-display time of the display frame period.
9. pixel circuit as described in any of the claims 1 to 8, which is characterized in that the pixel circuit include driving transistor,
First switch transistor, second switch transistor and storage capacitance, third switching transistor, the 4th switching transistor；Described
The output end of one switching transistor, the output end of the third switching transistor, the first electrode of the storage capacitance, Yi Jisuo
State the grid electrical connection of driving transistor, the input terminal of the grid of the first switch transistor and the third switching transistor
Electrical connection, the output end of the second switch transistor, the output end of the 4th switching transistor, the driving transistor
The first electrode of output end, the second electrode of the storage capacitance and the illuminating circuit is electrically connected, and the second switch is brilliant
The grid of body pipe and the electrical connection of the input terminal of the 4th switching transistor, the grid of the third switching transistor and described the
The grid of four switching transistors is electrically connected, and the input terminal of the driving transistor is electrically connected with the first current potential of power supply, described to shine
The second electrode of circuit is electrically connected with the second current potential of power supply.
10. a kind of OLED display panel, which is characterized in that including pixel array, the pixel array includes at least one as weighed
Benefit requires 1 to 9 any pixel circuit, and the pixel circuit includes:
Driving circuit；
Illuminating circuit is arranged in a one-to-one correspondence with driving circuit, and the illuminating circuit includes first electrode and second electrode, is being shown
In the display time in frame period, the voltage of the first electrode is greater than the voltage of the second electrode；
Delay circuit, in the first preset time of the display frame period, Xiang Suoshu first electrode and described second
At least one electrode in electrode provides hold-off voltage, so that in the first preset time of the display frame period, described the
The voltage of one electrode is less than the voltage of the second electrode, and first preset time is located at the non-display of the display frame period
In time.
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Application publication date: 20190726 |