CN107516488A - A kind of image element circuit, its driving method, display panel and display device - Google Patents
A kind of image element circuit, its driving method, display panel and display device Download PDFInfo
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- CN107516488A CN107516488A CN201710851339.6A CN201710851339A CN107516488A CN 107516488 A CN107516488 A CN 107516488A CN 201710851339 A CN201710851339 A CN 201710851339A CN 107516488 A CN107516488 A CN 107516488A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
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Abstract
The invention discloses a kind of image element circuit, its driving method, display panel and display device, including：Driving transistor, first switch transistor, second switch transistor, 3rd switching transistor, 4th switching transistor, first electric capacity and luminescent device, the threshold voltage of driving transistor is compensated by the mutual cooperation of above-mentioned each transistor and electric capacity, make the luminous driving current of driving luminescent device unrelated with the threshold voltage of driving transistor, the threshold voltage of driving transistor is avoided to the influence of luminescent device, improve the uniformity of display device viewing area brightness of image, and both the grid of driving transistor was initialized using the voltage of first voltage signal end by first switch transistor, the threshold voltage compensation of driving transistor is played a role again, therefore the setting of transistor and voltage end is reduced, high-resolution is advantageously implemented to show.
Description
Technical field
The present invention relates to display technology field, espespecially a kind of image element circuit, its driving method, display panel and display dress
Put.
Background technology
Organic Light Emitting Diode (Organic Light Emitting Diode, OLED) is current display research field
One of focus, compared to liquid crystal display (Liquid Crystal Display, LCD), OLED has low energy consumption, is produced into
The advantages that this low, self-luminous, wide viewing angle and fast response time, at present, show in the display field such as mobile phone, PDA, digital camera OLED
Display screen has begun to substitute traditional LCD display.Wherein, pixel circuit design is OLED display core technology content, tool
There is important Research Significance.
From LCD different using stable voltage control brightness, OLED belongs to electric current driving, it is necessary to which the electric current of stabilization controls
It is luminous.Due to reasons such as manufacturing process and device agings, the threshold voltage vt h of the driving transistor of image element circuit can be made to exist not
Uniformity, changed which results in the electric current for flowing through different OLED pixels so that display brightness is uneven, it is whole so as to influence
The display effect of individual image, although existing circuit structure can compensate for the threshold voltage of driving transistor, still suffer from one
A little problems, e.g., existing image element circuit in order to realize the basic function of compensation to threshold voltage vt h and image element circuit, it is necessary to
Multiple transistors and multiple voltage controling ends are set, make the structure of circuit become complicated, are unfavorable for realizing the high picture of display panel
Element display.
Therefore, how to simplify circuit structure to realize that the high pixel of display panel is shown is a urgent problem to be solved.
The content of the invention
The embodiment of the present invention provides a kind of image element circuit, its driving method, display panel and display device, existing to simplify
There is the structure of image element circuit, the image element circuit is applied to the display panel of high pixel arrangement.
A kind of image element circuit provided in an embodiment of the present invention, including：Driving transistor, first switch transistor, second open
Close transistor, the 3rd switching transistor, the 4th switching transistor, the first electric capacity and luminescent device；Wherein,
The second switch transistor is used for the signal of first voltage signal end under the control at the first light emitting control end
It is supplied to the first pole of the driving transistor；
3rd switching transistor is used to make the second of the driving transistor under the control at the second light emitting control end
Pole turns on the anode of the luminescent device；
4th switching transistor is used for the data-signal of data signal end under the control at the second scanning signal end
It is supplied to the second pole of the driving transistor；
The first switch transistor is used for the threshold voltage for compensating the driving transistor；And brilliant to the driving
Before body pipe carries out threshold voltage compensation, cooperated with the second switch transistor by the letter of the first voltage signal end
The grid of the driving transistor number is provided, resetted with the grid to the driving transistor；
First electric capacity is used for the grid voltage for keeping the driving transistor；
The driving transistor is used to generate driving current according to the data-signal to drive the luminescent device to light.
On the other hand, the embodiment of the present invention additionally provides a kind of driving method of above-mentioned image element circuit, including：
Node initializing stage, the first switch transistor are used to provide the signal of the first voltage signal end to institute
The grid of driving transistor is stated, is resetted with the grid to the driving transistor；The second switch transistor is first
The signal of first voltage signal end is supplied to the first pole of the driving transistor under the control at light emitting control end；
Threshold value reconnaissance phase, the 4th switching transistor is under the control at the second scanning signal end by the data
The data-signal of signal end is supplied to the second pole of the driving transistor；The first switch transistor is used to compensate the drive
The threshold voltage of dynamic transistor；
Glow phase, under the control at the first light emitting control end, the signal of first voltage signal end is supplied to institute
The first pole of driving transistor is stated, the second pole of the driving transistor and the hair are made under the control at the second light emitting control end
The anode conducting of optical device；First electric capacity keeps the grid voltage of the driving transistor；The driving transistor driving
The luminescent device lights.
On the other hand, the embodiment of the present invention additionally provides a kind of organic EL display panel, including：It is arranged in arrays
Multiple above-mentioned image element circuits provided in an embodiment of the present invention.
On the other hand, the embodiment of the present invention additionally provides a kind of display device, including：It is provided in an embodiment of the present invention above-mentioned
Organic EL display panel.
The present invention has the beneficial effect that：
A kind of image element circuit, its driving method, display panel and display device provided in an embodiment of the present invention, including：Drive
Dynamic transistor, first switch transistor, second switch transistor, the 3rd switching transistor, the 4th switching transistor, the first electric capacity
And luminescent device, the threshold voltage of driving transistor is compensated by the mutual cooperation of above-mentioned each transistor and electric capacity, made
Drive the luminous driving current of luminescent device unrelated with the threshold voltage of driving transistor, avoid the threshold voltage of driving transistor
Influence to luminescent device, when being loaded into different pixel cells using identical data-signal, it is identical brightness can be obtained
Image, improve the uniformity of display device viewing area brightness of image, and first is utilized by first switch transistor
The voltage of voltage signal end was both initialized to the grid of driving transistor, and the threshold voltage compensation of driving transistor is risen
To effect, therefore reduce the setting of transistor and voltage end, be advantageously implemented high-resolution and show.
Brief description of the drawings
Fig. 1 is a kind of circuit diagram of image element circuit provided in an embodiment of the present invention；
Fig. 2 is another circuit diagram of image element circuit provided in an embodiment of the present invention；
Fig. 3 is another circuit diagram of image element circuit provided in an embodiment of the present invention；
Fig. 4 is another circuit diagram of image element circuit provided in an embodiment of the present invention；
Fig. 5 is another circuit diagram of image element circuit provided in an embodiment of the present invention；
Fig. 6 is another circuit diagram of image element circuit provided in an embodiment of the present invention；
Fig. 7 is a kind of timing diagram corresponding to the image element circuit provided in Fig. 1；
Fig. 8 is a kind of timing diagram corresponding to the image element circuit provided in Fig. 3, Fig. 4 or Fig. 6；
Fig. 9 is a kind of timing diagram corresponding to the image element circuit provided in Fig. 5；
Figure 10 is the method flow diagram of the driving method of image element circuit provided in an embodiment of the present invention；
Figure 11 is the structural representation of pixel arrangements in organic electroluminescence display panel provided in an embodiment of the present invention；
Figure 12 is a kind of partial section of the image element circuit in organic electroluminescence display panel provided in an embodiment of the present invention；
Figure 13 is another partial cross section of the image element circuit in organic electroluminescence display panel provided in an embodiment of the present invention
Figure；
Figure 14 is the structural representation of display device provided in an embodiment of the present invention.
Embodiment
In order that the purpose of the present invention, technical scheme and advantage are clearer, below in conjunction with the accompanying drawings, to the embodiment of the present invention
The image element circuit of offer, driving method, the embodiment of display panel and display device are described in detail.It should manage
Solution, preferred embodiment disclosed below are merely to illustrate and explain the present invention, are not intended to limit the present invention.And do not rushing
In the case of prominent, the feature in embodiment and embodiment in the application can be mutually combined.
Obviously, described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.Based on this hair
Embodiment in bright, all other implementation that those of ordinary skill in the art are obtained under the premise of creative work is not made
Example, belongs to the scope of protection of the invention.The shapes and sizes of each part do not reflect actual proportions in accompanying drawing, and purpose is simply illustrated
Illustrate present invention.
Specifically, the embodiments of the invention provide a kind of image element circuit, as shown in figure 1, Fig. 1 provides for the embodiment of the present invention
Image element circuit a kind of circuit diagram, including：Driving transistor DT1, first switch transistor T1, second switch transistor
T2, the 3rd switching transistor T3, the 4th switching transistor T4, the first electric capacity C1 and luminescent device OLED；Wherein,
Second switch transistor T2 is used for first voltage signal end VDD under the first light emitting control end EMIT1 control
Signal be supplied to driving transistor DT1 the first pole；
3rd switch crystal T3 manages for making driving transistor DT1 under the second light emitting control end EMIT2 control
Two poles turn on luminescent device OLED anode；
4th switching transistor T4 is used for data signal end data number under the second scanning signal end Scan2 control
It is believed that number Vdata is supplied to driving transistor DT1 the second pole；
First switch transistor T1 is used for compensation for drive transistor DT1 threshold voltage；And to driving transistor DT1
Before carrying out valve value compensation, cooperated with second switch transistor T2 and provide first voltage signal end VDD signal to driving
Transistor DT1 grid, resetted with the grid to driving transistor DT1；
First electric capacity C1 is used for the grid voltage for keeping driving transistor DT1；
Driving transistor DT1 is used to generate driving current according to data-signal Vdata to drive luminescent device OLED to light.
Above-mentioned image element circuit provided in an embodiment of the present invention, including：Driving transistor, first switch transistor, second open
Close transistor, the 3rd switching transistor, the 4th switching transistor, the first electric capacity and luminescent device, by above-mentioned each transistor and
The mutual cooperation of electric capacity compensates to the threshold voltage of driving transistor, makes the luminous driving current of driving luminescent device and drive
The threshold voltage of dynamic transistor is unrelated, avoids the threshold voltage of driving transistor from using identical to the influence of luminescent device
When data-signal is loaded into different pixel cells, brightness identical image can be obtained, improves display device viewing area
The uniformity of brightness of image, and the voltage of first voltage signal end is utilized both to driving transistor by first switch transistor
Grid initialized, and the threshold voltage compensation of driving transistor is played a role, therefore reduce transistor and voltage
The setting at end, it is advantageously implemented resolution ratio and shows.
It should be noted that because first switch transistor has connected into driving transistor the structure of diode, therefore,
In threshold value reconnaissance phase, the data-signal that first switch transistor sends data signal end is supplied to the grid of driving transistor
Pole, i.e., data write-in is carried out by first switch transistor, detected with the threshold voltage of the transistor to driving；Except this it
Outside, the signal of first voltage signal end is provided to the grid of driving transistor in node initializing stage, first switch transistor,
Resetted, i.e., the grid of driving transistor is carried out using the voltage of first voltage signal end with the grid to driving transistor
Reset, it is not necessary to set extra transistor and voltage signal end to reset the grid of driving transistor again, so as to reduce
The setting of transistor and voltage signal end.
Specifically, in above-mentioned image element circuit provided in an embodiment of the present invention, as shown in figure 1, luminescent device OLED anode
Extremely it is connected with the second of driving transistor DT1, luminescent device OLED negative electrode is connected with second voltage signal end VSS.
Specifically, in above-mentioned image element circuit provided in an embodiment of the present invention, driving transistor is N-type transistor.In order to protect
Driving transistor energy normal work is demonstrate,proved, the voltage of corresponding first voltage signal end output is generally positive voltage, second voltage letter
The voltage of number end output is typically grounded or be negative value.
Specifically, in above-mentioned image element circuit provided in an embodiment of the present invention, as shown in figure 1, first switch transistor T1
Grid is connected with the first scanning signal end Scan1, first switch transistor T1 the first pole and driving transistor DT1 the first pole
It is connected, first switch transistor T1 the second pole is connected with driving transistor DT1 grid.
Specifically, in above-mentioned image element circuit provided in an embodiment of the present invention, as shown in figure 1, first switch transistor T1 can
Think N-type transistor, now, first switch transistor T1 is in when the first scanning signal end Scan1 signal is high level
Conducting state, when the first scanning signal end Scan1 signal is low level, first switch transistor T1 is in cut-off state；Such as
Shown in Fig. 2, Fig. 2 be image element circuit provided in an embodiment of the present invention another circuit diagram, first switch transistor T1
Can be P-type transistor, now, when the first scanning signal end Scan1 signal is low level at first switch transistor T1
In conducting state, when the first scanning signal end Scan1 signal is high level, first switch transistor T1 is in cut-off state；
It is not limited thereto.
Specifically, in above-mentioned image element circuit provided in an embodiment of the present invention, when first switch transistor is in the first scanning letter
Number end control under it is in the conduction state when, the first voltage signal that first voltage signal end is sent is just by the first of conducting
Switching transistor is transferred to the grid of driving transistor, that is, is supplied to the grid of driving transistor；When first switch transistor exists
When in the conduction state under the control at the first scanning signal end, the data-signal that can also send data signal end is supplied to drive
The grid of dynamic transistor, carries out data write-in, in order to be compensated to the threshold voltage of driving transistor.
Specifically, in above-mentioned image element circuit provided in an embodiment of the present invention, as shown in figure 1, second switch transistor T2
Grid is connected with the first light emitting control end EMIT1, second switch transistor T2 the first pole and first voltage signal end VDD phases
Even, second switch transistor T2 the second pole is extremely connected with the first of driving transistor DT1.
Specifically, in above-mentioned image element circuit provided in an embodiment of the present invention, as shown in figure 1, second switch transistor T2 can
N-type transistor is thought, now, when the first LED control signal that the first light emitting control end EMIT1 is sent is high level second
Switching transistor T2 is in the conduction state, when the first LED control signal that the first light emitting control end EMIT1 is sent is low level
When second switch transistor T2 be in cut-off state；As shown in Fig. 2 second switch transistor T2 can also be P-type transistor, this
When, when the first LED control signal that the first light emitting control end EMIT1 is sent is low level, second switch transistor T2 is in
Conducting state, the second switch transistor when the first LED control signal that the first light emitting control end EMIT1 is sent is high level
T2 is in cut-off state；It is not limited thereto.
Specifically, in above-mentioned image element circuit provided in an embodiment of the present invention, when second switch transistor is luminous first
When in the conduction state under the control of control terminal, the first voltage signal that first voltage signal end is sent is just by the second of conducting
Switching transistor is transferred to section point, and the first voltage signal that first voltage signal end is sent is supplied into driving transistor
Grid, the grid of driving transistor is resetted, or, pass through the first voltage signal that first voltage signal end is sent
Driving transistor forms driving current, and driving luminescent device is lighted.
Specifically, in above-mentioned image element circuit provided in an embodiment of the present invention, as shown in figure 1, the 3rd switching transistor T3
Grid be connected with the second light emitting control end EMIT2, the 3rd switching transistor T3 the first pole and the second of driving transistor DT1
Extremely it is connected, the 3rd switching transistor T3 the second pole is connected with luminescent device OLED anode.
Specifically, in above-mentioned image element circuit provided in an embodiment of the present invention, as shown in figure 1, the 3rd switching transistor T3
Can be N-type transistor, now, when the second LED control signal that the second light emitting control end EMIT2 is sent is high level
Three switching transistor T3 are in the conduction state, when the second LED control signal that the second light emitting control end EMIT2 is sent is low electricity
Usually the 3rd switching transistor T3 is in cut-off state；As shown in Fig. 2 the 3rd switching transistor T3 can also be P-type transistor,
Now, when the second light emitting control end EMIT2 the second LED control signals sent are low level at the 3rd switching transistor T3
In conducting state, the 3rd switch crystal when the second LED control signal that the second light emitting control end EMIT2 is sent is high level
Pipe T3 is in cut-off state；It is not limited thereto.
Specifically, in above-mentioned image element circuit provided in an embodiment of the present invention, when the 3rd switching transistor is luminous second
When in the conduction state under the control of control terminal, driving current is supplied to the anode of luminescent device, to drive luminescent device to enter
Row is luminous.
Specifically, in above-mentioned image element circuit provided in an embodiment of the present invention, as shown in figure 3, Fig. 3 is the embodiment of the present invention
Another circuit diagram of the image element circuit of offer, the first light emitting control end and the second light emitting control end are same light emitting control
End.
Specifically, in above-mentioned image element circuit provided in an embodiment of the present invention, the first light emitting control end and second are lighted
Control terminal is arranged to same light emitting control end, it is possible to reduce the setting at light emitting control end, simplifies the structure of circuit.
It should be noted that when the first light emitting control end and the second light emitting control end are same light emitting control end, although
When first voltage signal end resets to the grid of driving transistor, second switch transistor and the 3rd switching transistor are simultaneously
Open, luminescent device can be made to light, but because the time resetted to the grid of driving transistor is shorter, luminescent device is only
It is of short duration luminous, image, which is shown, to be had an impact.
Specifically, in above-mentioned image element circuit provided in an embodiment of the present invention, as shown in figure 1, the 4th switching transistor T4
Grid be connected with the second scanning signal end Scan2, the 4th switching transistor T4 the first pole is connected with data signal end data,
4th switching transistor T4 the second pole is extremely connected with the second of driving transistor DT1.
Specifically, in above-mentioned image element circuit provided in an embodiment of the present invention, as shown in figure 1, the 4th switching transistor T4 can
Think N-type transistor, now, the 4th switching transistor T4 is in when the second scanning signal end Scan2 signal is high level
Conducting state, when the second scanning signal end Scan2 signal is low level, the 4th switching transistor T4 is in cut-off state；Such as
Shown in Fig. 2, the 4th switching transistor T4 can also be P-type transistor, now, when the second scanning signal end Scan2 signal is
The 4th switching transistor T4 is in the conduction state during low level, when the second scanning signal end Scan2 signal is high level
Four switching transistor T4 are in cut-off state；It is not limited thereto.
Specifically, in above-mentioned image element circuit provided in an embodiment of the present invention, when the 4th switching transistor is in the second scanning letter
When in the conduction state under the control at number end, the 4th switching transistor that the data-signal that data signal end is sent is passed through into conducting
It is supplied to the second pole of driving transistor, i.e., the 4th switching transistor for the data-signal that data signal end is sent being passed through into conducting
The 3rd node is supplied to, to carry out the write-in of data-signal.
Alternatively, in above-mentioned image element circuit provided in an embodiment of the present invention, as shown in figure 1, the first electric capacity C1 the first electricity
Pole is connected with driving transistor DT1 grid, and the first electric capacity C1 second electrode is connected with first voltage signal end VDD.
Wherein, the first electric capacity plays coupling to ensure between the grid and first voltage signal end of driving transistor
The grid of driving transistor and the voltage of first voltage signal end keep stable.
Specifically, in above-mentioned image element circuit provided in an embodiment of the present invention, as shown in figure 4, Fig. 4 carries for the embodiment of the present invention
Another circuit diagram of the image element circuit of confession, in addition to：5th switching transistor T5；Wherein,
5th switching transistor T5 is used for the control in the first scanning signal end Scan1 by reference signal end Vref signal
It is supplied to luminescent device OLED anode.
Specifically, in above-mentioned image element circuit provided in an embodiment of the present invention, as shown in figure 4, the 5th switching transistor T5
Grid is connected with the first scanning signal end Scan1, and the 5th switching transistor T5 the first pole is connected with reference signal end Vref, the
Five switching transistor T5 the second pole is connected with luminescent device OLED anode.
Specifically, in above-mentioned image element circuit provided in an embodiment of the present invention, as shown in figure 4, the 5th switching transistor T5 can
Think N-type transistor, now, the 5th switching transistor T5 is in when the first scanning signal end Scan1 signal is high level
Conducting state, when the first scanning signal end Scan1 signal is low level, the 5th switching transistor T5 is in cut-off state；Such as
Shown in Fig. 5, Fig. 5 be image element circuit provided in an embodiment of the present invention another circuit diagram, the 5th switching transistor T5
Can be P-type transistor, now, when the first scanning signal end Scan1 signal is low level at the 5th switching transistor T5
In conducting state, when the first scanning signal end Scan1 signal is high level, the 5th switching transistor T5 is in cut-off state；
It is not limited thereto.
Specifically, in above-mentioned image element circuit provided in an embodiment of the present invention, when the 5th switching transistor is in the first scanning letter
When in the conduction state under the control at number end, the 5th switching transistor that the reference signal that reference signal end is sent is passed through into conducting
The anode of luminescent device is supplied to, is resetted with the anode to luminescent device, avoids the voltage that previous frame remains to photophore
The luminous of part has an impact.
Alternatively, in above-mentioned image element circuit provided in an embodiment of the present invention, as shown in Figure 4 and Figure 6, Fig. 6 is real for the present invention
Another circuit diagram of the image element circuit of example offer, the first electric capacity C1 first electrode and driving transistor DT1 grid are provided
Extremely it is connected, the first electric capacity C1 second electrode is connected with first voltage signal end VDD or luminescent device OLED anode.
Specifically, in above-mentioned image element circuit provided in an embodiment of the present invention, when above-mentioned image element circuit is provided with the 5th switch
During transistor, the first electrode of the first electric capacity can be connected with the grid of driving transistor, the second electrode of the first electric capacity with
The anode of first voltage signal end or luminescent device is connected, so as to ensure the grid of driving transistor and first voltage signal end it
Between voltage keep stable, or the voltage between the grid of driving transistor and fourth node is kept stable.
It should be noted that the first electrode of the first electric capacity is connected with the grid of driving transistor always, but only work as
When being provided with the 5th brilliant switch body pipe in above-mentioned image element circuit, the second electrode of the first electric capacity could be with the anode phase of luminescent device
Even, the second pole electrode of the first electric capacity is just made to be connected with the anode of luminescent device if being not provided with the 5th switching transistor, due to
The effect of first electric capacity can cause the residual signal of previous frame to be had an impact to the luminous of luminescent device, whole aobvious so as to cause
Show that Display panel is uneven.
Alternatively, in above-mentioned image element circuit provided in an embodiment of the present invention, all transistors are N-type transistor.
Specifically, in above-mentioned image element circuit provided in an embodiment of the present invention, by all switching transistors and driving crystal
Pipe is disposed as N-type transistor, can so simplify the fabrication processing of image element circuit.
It should be noted that illustrated so that driving transistor is N-type transistor as an example in the above embodiment of the present invention
, fall within the scope of protection of the invention in the case of driving transistor is P-type transistor and use same design principle.
In the specific implementation, driving transistor and switching transistor can be thin film transistor (TFT) (TFT, Thin Film
Transistor) or metal oxide semiconductor field effect tube (MOS, Metal Oxide Semiconductor),
Do not limit herein.In specific implementation, the first pole and the second pole of these transistors are believed according to transistor types and input
Number difference, its function can exchange, and not do specific differentiation herein.
Separately below by taking the structure of the image element circuit shown in Fig. 1, Fig. 4 and Fig. 5 as an example, combined circuit timing diagram is to the present invention
The course of work for the above-mentioned image element circuit that embodiment provides is described.It should be noted that driving transistor in regulation accompanying drawing
Grid be first node N1, the first extremely section point N2 of driving transistor, second extremely Section three of driving transistor
Point N3, the anode of luminescent device is fourth node N4.High potential is represented with 1 in described below, 0 represents low potential.Need to illustrate
, 1 and 0 is logic level, and it is merely to preferably explain the specific work process of the embodiment of the present invention, rather than having
Body is applied to the voltage on the grid of each switching transistor when implementing.
Embodiment one
Alternatively, illustrated by taking the structure of the image element circuit shown in Fig. 1 as an example, corresponding input and output sequential chart is as schemed
Shown in 7, Fig. 7 is a kind of timing diagram corresponding to the structure shown in Fig. 1.Specifically, when mainly choosing input and output as shown in Figure 7
Node initializing stage P1, threshold value reconnaissance phase P2 and glow phase P3 three phases in sequence figure.
In node initializing stage P1, EMIT1=1, EMIT2=0, Scan1=1, Scan2=0.
Due to EMIT1=1, thus second switch transistor T2 conductings with first voltage signal end VDD is sent first
Voltage signal V1 is supplied to section point N2, and section point N2 current potential is V1；Due to Scan1=1, therefore first switch crystal
Pipe T1 conductings are supplied to first node N1 with the first voltage signal V1 for sending first voltage signal end VDD, first node
Current potential is V1, i.e., first node N1 current potential is carried out just by the first voltage signal V1 that first voltage signal end VDD is sent
Beginningization；Because Scan2=0, the 4th switching transistor T4 end, therefore the data-signal that data signal end data can not be sent
Vdata is supplied to the 3rd node N3；Because EMIT2=0, the 3rd switching transistor T3 end, Organic Light Emitting Diode OLED is not
It is luminous.
In threshold value reconnaissance phase P2, EMIT1=0, EMIT2=0, Scan1=1, Scan2=1.
Because EMIT1 and EMIT2 are 0, therefore second switch transistor T2 and the 3rd switching transistor T3 are turned off；By
In Scan2=1, therefore the 4th switching transistor T4 conductings are provided with the data-signal Vdata for sending data signal end data
To the 3rd node N3, because first node N1 keeps current potential V1 on last stage, and first voltage signal V1 believes more than data
Number Vdata, therefore driving transistor DT1 is turned on；Again because Scan1=1, first switch transistor T1 are turned on, when driving crystal
When pipe DT1 and first switch transistor T1 are both turned on, first node N1 current potential can decline, when first node N1 current potential reduces
During to Vdata+Vth, driving transistor DT1 cut-offs, threshold value detecting is completed, wherein, Vth is the threshold voltage of driving transistor.
Glow phase P3, EMIT1=1, EMIT2=1, Scan1=0, Scan2=0.
Because Scan1=0, first switch transistor T1 end, first node N1 current potential keeps the current potential during P2 stages,
Therefore first node N1 current potential is Vdata+Vth；Due to EMIT1=1, second switch transistor T2 conductings are with by first voltage
The first voltage signal V1 of signal end VDD outputs is supplied to section point N2, and forms driving electricity by driving transistor DT1
Stream；Again because EMIT2=1, the 3rd switching transistor T3 are turned on, so that driving current driving luminescent device OLED lights, and send out
Photoelectric current I=k (Vdata-Voled)2=k (Vdata)2, wherein k is glow current coefficient, and Voled is luminescent device OLED sun
The current potential of pole, because now luminescent device OLED anode does not have control source, therefore, Voled=0.
Embodiment two
Alternatively, illustrated by taking the structure of the image element circuit shown in Fig. 6 as an example, corresponding input and output sequential chart is as schemed
Shown in 8, Fig. 8 is a kind of timing diagram corresponding to the structure shown in Fig. 6.Specifically, when mainly choosing input and output as shown in Figure 8
Node initializing stage P1, threshold value reconnaissance phase P2 and glow phase P3 three phases in sequence figure.
In node initializing stage P1, EMIT1=1, Scan1=1, Scan2=0.
Due to EMIT1=1, therefore second switch transistor T2 and the 3rd switching transistor T3 is turned on, second switch crystal
The first voltage signal V1 that first voltage signal end VDD is sent is supplied to section point N2, section point N2 current potential by pipe T2
Fourth node N4 current potential is supplied to the 3rd node N3 for V1, the 3rd switching transistor T3；Due to Scan1=1, therefore first
Switching transistor T1 and the 5th switching transistor T5 conductings, first switch transistor T1 send first voltage signal end VDD
First voltage signal V1 is supplied to first node N1, and first node N1 current potential is V1, i.e., is sent out by first voltage signal end VDD
The first voltage signal V1 gone out initializes to first node N1 current potential, and the 5th switching transistor T5 is by reference signal end
The reference signal that Vref is sent is supplied to fourth node N4, i.e., is supplied to the reference signal end Vref reference signals sent luminous
Device OLED anode, luminescent device OLED anode is resetted, and because now the 3rd switching transistor T3 is turned on,
Fourth node N4 current potential can be supplied to by the 3rd node N3 by the 3rd switching transistor T3 of conducting, to the 3rd node N3
Resetted, wherein, because the Vref reference signals sent in reference signal end are generally low potential, therefore, using with reference to letter
When number being resetted to luminescent device OLED anode, luminescent device OLED does not light；Due to Scan2=0, the 4th switch crystal
Pipe T4 ends, therefore the data-signal Vdata that data signal end data is sent can not be supplied into the 3rd node N3.
In threshold value reconnaissance phase P2, EMIT1=0, Scan1=1, Scan2=1.
Due to EMIT1=0, therefore second switch transistor T2 and the 3rd switching transistor T3 are turned off；Due to Scan2=
1, therefore the 4th switching transistor T4 conductings are supplied to the 3rd node with the data-signal Vdata for sending data signal end data
N3, because first node N1 keeps current potential V1 on last stage, and first voltage signal V1 is more than data-signal Vdata, because
This driving transistor DT1 is turned on；Again because Scan1=1, first switch transistor T1 are turned on, as driving transistor DT1 and first
When switching transistor T1 is both turned on, first node N1 current potential can decline, when first node N1 current potential is reduced to Vdata+Vth
When, driving transistor DT1 cut-offs, threshold value detecting is completed, wherein, Vth is driving transistor DT1 threshold voltage.
Glow phase P3, EMIT1=1, Scan1=0, Scan2=0.
Because Scan1=0, first switch transistor T1 end, first node N1 current potential keeps the current potential during P2 stages,
Therefore first node N1 current potential is Vdata+Vth；Due to EMIT1=1, second switch transistor T2 and the 3rd switching transistor
T3 is turned on, and the first voltage signal V1 that first voltage signal end VDD is exported is supplied to section point by second switch transistor T2
N2, and driving current is formed by driving transistor DT1, and drive driving current by the 3rd switching transistor T3 of conducting
Luminescent device OLED lights, and glow current I=k (Vdata-Voled), wherein k are glow current coefficient, and Voled is luminous
The current potential of device OLED anodes, now the anode potential of luminescent device is Vref, therefore I=k (Vdata-Vref).
Embodiment three
Alternatively, illustrated by taking the structure of the image element circuit shown in Fig. 5 as an example, corresponding input and output sequential chart is as schemed
Shown in 9, Fig. 9 is a kind of timing diagram corresponding to the structure shown in Fig. 5.Specifically, when mainly choosing input and output as shown in Figure 9
Node initializing stage P1, threshold value reconnaissance phase P2 and glow phase P3 three phases in sequence figure.
In node initializing stage P1, EMIT1=0, Scan1=0, Scan2=1.
Due to EMIT1=0, therefore second switch transistor T2 and the 3rd switching transistor T3 is turned on, second switch crystal
The first voltage signal V1 that first voltage signal end VDD is sent is supplied to section point N2, section point N2 current potential by pipe T2
Fourth node N4 current potential is supplied to the 3rd node N3 for V1, the 3rd switching transistor T3；Due to Scan1=0, therefore first
Switching transistor T1 and the 5th switching transistor T5 conductings, first switch transistor T1 send first voltage signal end VDD
First voltage signal V1 is supplied to first node N1, and first node N1 current potential is V1, i.e., is sent out by first voltage signal end VDD
The first voltage signal V1 gone out initializes to first node N1 current potential, and the 5th switching transistor T5 is by reference signal end
The reference signal that Vref is sent is supplied to fourth node N4, i.e., is supplied to the reference signal end Vref reference signals sent luminous
Device OLED anode, luminescent device OLED anode is resetted, and because now the 3rd switching transistor T3 is turned on,
Fourth node N4 current potential can be supplied to by the 3rd node N3 by the 3rd switching transistor T3 of conducting, to the 3rd node N3
Resetted, wherein, because the Vref reference signals sent in reference signal end are generally low potential, therefore, using with reference to letter
When number being resetted to luminescent device OLED anode, luminescent device OLED does not light；Due to Scan2=1, the 4th switch crystal
Pipe T4 ends, therefore the data-signal Vdata that data signal end data is sent can not be supplied into the 3rd node N3.
In threshold value reconnaissance phase P2, EMIT1=1, Scan1=0, Scan2=0.
Due to EMIT1=1, therefore second switch transistor T2 and the 3rd switching transistor T3 are turned off；Due to Scan2=
0, therefore the 4th switching transistor T4 conductings are supplied to the 3rd node with the data-signal Vdata for sending data signal end data
N3, because first node N1 keeps current potential V1 on last stage, and first voltage signal V1 is more than data-signal Vdata, because
This driving DT1 conductings；Again because Scan1=0, first switch transistor T1 are turned on, when driving transistor DT1 and first switch are brilliant
When body pipe T1 is both turned on, first node N1 current potential can decline, and when first node N1 current potential is reduced to Vdata+Vth, drive
Dynamic transistor DT1 cut-offs, complete threshold value detecting, wherein, Vth is driving transistor DT1 threshold voltage.
Glow phase P3, EMIT1=0, Scan1=1, Scan2=1.
Because Scan1=1, first switch transistor T1 end, first node N1 current potential keeps the current potential during P2 stages,
Therefore first node N1 current potential is Vdata+Vth；Due to EMIT1=0, second switch transistor T2 and the 3rd switching transistor
T3 is turned on, and the first voltage signal V1 that first voltage signal end VDD is exported is supplied to section point by second switch transistor T2
N2, and driving current is formed by driving transistor DT1, and drive driving current by the 3rd switching transistor T3 of conducting
Luminescent device OLED lights, and glow current I=k (Vdata-Voled), wherein k are glow current coefficient, and Voled is luminous
The current potential of device OLED anodes, now the anode potential of luminescent device is Vref, therefore I=k (Vdata-Vref).
Based on same inventive concept, the embodiment of the present invention additionally provides a kind of driving method of image element circuit, such as Figure 10 institutes
Showing, Figure 10 is the method flow diagram of the driving method of image element circuit provided in an embodiment of the present invention, including：
S101, node initializing stage, first switch transistor are used to provide the signal of first voltage signal end to driving
The grid of transistor, resetted with the grid to driving transistor；Control of the second switch transistor at the first light emitting control end
The signal of first voltage signal end is supplied to the first pole of driving transistor under system；
S102, threshold value reconnaissance phase, the 4th switching transistor is under the control at the second scanning signal end by data signal end
Data-signal be supplied to the second pole of driving transistor；First switch transistor is used for the threshold value electricity of compensation for drive transistor
Pressure；
S103, glow phase, under the control at the first light emitting control end, the signal of first voltage signal end is supplied to drive
First pole of dynamic transistor, the second pole and the anode of luminescent device of driving transistor are made under the control at the second light emitting control end
Conducting；First electric capacity keeps the grid voltage of driving transistor；Driving transistor driving luminescent device lights.
The detailed process of the driving method of above-mentioned pixel-driving circuit is carried out in embodiment one into embodiment three
Illustrate in detail, repeat part herein and repeat no more.
Based on same inventive concept, the embodiment of the present invention additionally provides a kind of organic EL display panel, such as Figure 11
Shown, Figure 11 is the structural representation of pixel arrangements in organic electroluminescence display panel provided in an embodiment of the present invention, including：
Multiple above-mentioned image element circuits 10 provided in an embodiment of the present invention of array arrangement.The display panel typically also includes grid line Gate,
Data wire data, gate driving circuit 20 and data signal line driving circuit 30 etc..The organic electroluminescence display panel solves problem
Principle it is similar to foregoing image element circuit, therefore the implementation of the organic electroluminescence display panel may refer to the reality of foregoing image element circuit
Apply, repeat part and will not be repeated here.
Specifically, in above-mentioned organic EL display panel provided in an embodiment of the present invention, as shown in figure 12, Tu12Wei
A kind of partial section of image element circuit in organic electroluminescence display panel provided in an embodiment of the present invention, the first of the first electric capacity
Electrode 8 and the grid 4 of driving transistor are set with layer.
Specifically, in above-mentioned organic EL display panel provided in an embodiment of the present invention, the first electricity of the first electric capacity
Pole is connected with the grid of driving transistor, and the grid of the first pole of the first electric capacity and driving transistor is arranged on into same layer,
Connect can directly the first pole of the first electric capacity and the grid of driving transistor when being patterned, without being punched again,
Simplify processing step.
Specifically, in above-mentioned organic EL display panel provided in an embodiment of the present invention, as shown in Figure 12 or Figure 13,
Figure 13 is another partial section of the image element circuit in organic electroluminescence display panel provided in an embodiment of the present invention, and first is electric
The second electrode 9 of appearance is set with any one layer in the first pole 6 of driving transistor, the second pole 7 or channel layer 2 with layer.
Specifically, in above-mentioned organic EL display panel provided in an embodiment of the present invention, by the second of the first electric capacity
Any layer in first pole of electrode and driving transistor, the second pole or channel layer is arranged to same layer, reduces the setting of film layer,
And it can be completed by patterning processes successively, simplify processing step, saved production cost.
It should be noted that as shown in figure 12, driving transistor is included in the raceway groove that the side of underlay substrate 1 is set gradually
The 2, first insulating barrier 3 of layer, grid 4, the second insulating barrier 5, the first pole 6 and the second pole 7.
Based on same inventive concept, as shown in figure 14, Figure 14 is that the structure of display device provided in an embodiment of the present invention is shown
It is intended to, the embodiment of the present invention additionally provides a kind of display device, including above-mentioned organic light emitting display provided in an embodiment of the present invention
Panel.The display device can be display, mobile phone, TV, notebook computer, Electronic Paper, DPF, navigator, one
Machine etc., other essential parts for display device are it will be apparent to an ordinarily skilled person in the art that having
, it will not be described here, also should not be taken as limiting the invention.
A kind of image element circuit, its driving method, display panel and display device provided in an embodiment of the present invention, including：Drive
Dynamic transistor, first switch transistor, second switch transistor, the 3rd switching transistor, the 4th switching transistor, the first electric capacity
And luminescent device, the threshold voltage of driving transistor is compensated by the mutual cooperation of above-mentioned each transistor and electric capacity, made
Drive the luminous driving current of luminescent device unrelated with the threshold voltage of driving transistor, avoid the threshold voltage of driving transistor
Influence to luminescent device, when being loaded into different pixel cells using identical data-signal, it is identical brightness can be obtained
Image, improve the uniformity of display device viewing area brightness of image, and first is utilized by first switch transistor
The voltage of voltage signal end was both initialized to the grid of driving transistor, and the threshold voltage compensation of driving transistor is risen
To effect, therefore reduce the setting of transistor and voltage end, be advantageously implemented high-resolution and show.
Obviously, those skilled in the art can carry out the essence of various changes and modification without departing from the present invention to the present invention
God and scope.So, if these modifications and variations of the present invention belong to the scope of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to comprising including these changes and modification.
Claims (16)
- A kind of 1. image element circuit, it is characterised in that including：Driving transistor, first switch transistor, second switch transistor, 3rd switching transistor, the 4th switching transistor, the first electric capacity and luminescent device；Wherein,The second switch transistor is used to provide the signal of first voltage signal end under the control at the first light emitting control end The first pole to the driving transistor；3rd switching transistor be used to making under the control at the second light emitting control end the second pole of the driving transistor with The anode conducting of the luminescent device；4th switching transistor is used to provide the data-signal of data signal end under the control at the second scanning signal end The second pole to the driving transistor；The first switch transistor is used for the threshold voltage for compensating the driving transistor；And to the driving transistor Before carrying out threshold voltage compensation, cooperated with the second switch transistor and carry the signal of the first voltage signal end For the grid of the driving transistor, resetted with the grid to the driving transistor；First electric capacity is used for the grid voltage for keeping the driving transistor；The driving transistor is used to generate driving current according to the data-signal to drive the luminescent device to light.
- 2. image element circuit as claimed in claim 1, it is characterised in that the grid of the first switch transistor and the first scanning Signal end is connected, and the first pole of the first switch transistor is extremely connected with the first of the driving transistor, and described first opens The second pole for closing transistor is connected with the grid of the driving transistor.
- 3. image element circuit as claimed in claim 2, it is characterised in that the grid of the second switch transistor and described first Light emitting control end is connected, and the first pole of the second switch transistor is connected with the first voltage signal end, and described second opens The second pole for closing transistor is extremely connected with the first of the driving transistor.
- 4. image element circuit as claimed in claim 3, it is characterised in that the grid and described second of the 3rd switching transistor Light emitting control end is connected, and the first pole of the 3rd switching transistor is extremely connected with the second of the driving transistor, and described Second pole of three switching transistors is connected with the anode of the luminescent device.
- 5. image element circuit as claimed in claim 4, it is characterised in that the first light emitting control end and the second luminous control End processed is same light emitting control end.
- 6. image element circuit as claimed in claim 2, it is characterised in that the grid and described second of the 4th switching transistor Scanning signal end is connected, and the first pole of the 4th switching transistor is connected with the data signal end, and the 4th switch is brilliant Second pole of body pipe is extremely connected with the second of the driving transistor.
- 7. image element circuit as claimed in claim 1, it is characterised in that the first electrode of first electric capacity and the driving are brilliant The grid of body pipe is connected, and the second electrode of first electric capacity is connected with the first voltage signal end.
- 8. image element circuit as claimed in claim 1, it is characterised in that also include：5th switching transistor；Wherein,The control that 5th switching transistor is used at the first scanning signal end carries the signal at the reference signal end Supply the anode of the luminescent device.
- 9. image element circuit as claimed in claim 8, it is characterised in that the grid and described first of the 5th switching transistor Scanning signal end is connected, and the first pole of the 5th switching transistor is connected with the reference signal end, and the 5th switch is brilliant Second pole of body pipe is connected with the anode of the luminescent device.
- 10. image element circuit as claimed in claim 8, it is characterised in that the first electrode of first electric capacity and the driving The grid of transistor is connected, the second electrode of first electric capacity and the first voltage signal end or the sun of the luminescent device Extremely it is connected.
- 11. the image element circuit as described in claim any one of 1-8, it is characterised in that all transistors are N-type transistor.
- A kind of 12. driving method for driving the image element circuit as described in claim any one of 1-11, it is characterised in that including：Node initializing stage, the first switch transistor are used to provide the signal of the first voltage signal end to the drive The grid of dynamic transistor, is resetted with the grid to the driving transistor；The second switch transistor is luminous first The signal of first voltage signal end is supplied to the first pole of the driving transistor under the control of control terminal；Threshold value reconnaissance phase, the 4th switching transistor is under the control at the second scanning signal end by the data-signal The data-signal at end is supplied to the second pole of the driving transistor；The first switch transistor is used to compensate the driving crystalline substance The threshold voltage of body pipe；Glow phase, under the control at the first light emitting control end, the signal of first voltage signal end is supplied to the drive First pole of dynamic transistor, the second pole of the driving transistor and the photophore are made under the control at the second light emitting control end The anode conducting of part；First electric capacity keeps the grid voltage of the driving transistor；Described in the driving transistor driving Luminescent device lights.
- 13. a kind of organic EL display panel, including multiple image element circuits arranged in arrays, it is characterised in that described Image element circuit is the image element circuit as described in right any one of 1-11.
- 14. display panel as claimed in claim 13, it is characterised in that the first electrode of first electric capacity and the driving The grid of transistor is set with layer.
- 15. display panel as claimed in claim 14, it is characterised in that the second electrode of first electric capacity and the driving Any one layer in first pole of transistor, the second pole or channel layer is set with layer.
- 16. a kind of display device, it is characterised in that including the organic light emitting display face as described in claim any one of 13-15 Plate.
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| CN108320701A (en) * | 2018-03-07 | 2018-07-24 | 昆山国显光电有限公司 | A kind of pixel circuit, organic EL display panel and display device |
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| CN114758612A (en) * | 2022-04-18 | 2022-07-15 | 深圳市华星光电半导体显示技术有限公司 | Pixel compensation circuit, display panel and pixel compensation method |
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