CN106847188A - Image element circuit and its driving method, display panel and display device - Google Patents
Image element circuit and its driving method, display panel and display device Download PDFInfo
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- CN106847188A CN106847188A CN201710210549.7A CN201710210549A CN106847188A CN 106847188 A CN106847188 A CN 106847188A CN 201710210549 A CN201710210549 A CN 201710210549A CN 106847188 A CN106847188 A CN 106847188A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
- G09G3/3258—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 voltage across the light-emitting element
-
- 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]
- G09G3/3266—Details of drivers for scan electrodes
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Electroluminescent Light Sources (AREA)
- Control Of El Displays (AREA)
Abstract
The present invention provides a kind of image element circuit and its driving method, display panel and display device, image element circuit includes three transistors, an electric capacity and an Organic Light Emitting Diodes, the grid of the first transistor connects the first control signal, first electrode connects data-signal, and second electrode connects one end of electric capacity；The grid of transistor seconds connects the second control signal, and first electrode connects the other end of electric capacity, second electrode connection power supply voltage signal；The grid of third transistor connects one end of electric capacity, first electrode connection Organic Light Emitting Diode, second electrode connection power supply voltage signal；By the SECO the first transistor of the first control signal and the second control signal, the conducting of transistor seconds and shut-in time, so as to control the magnitude of voltage at the electric capacity two ends, by the ON time of the change control third transistor of magnitude of voltage, so as to the dutycycle of lighting time that adjusts OLED in a cycle, the precise control of OLED brightness is realized.
Description
Technical field
The present invention relates to flat panel display technology field, and in particular to a kind of image element circuit and its driving method, display panel
With display device.
Background technology
Organic luminescent device, i.e. Organic Light Emitting Diode (Organic Light-Emitting Diode, abbreviation OLED),
Be also called ORGANIC ELECTROLUMINESCENCE DISPLAYS (Organic Electroluminesence Display, abbreviation OLED) have extensively regard
The advantages of angle, high brightness, high-contrast, low energy consumption, more frivolous volume, be current flat panel display focus of attention.
In OLED lighting fields, mainly flow through the electric current of OLED or the voltage at OLED two ends by control to control
OLED display brightness, but because the influence of other disturbing factors such as noise, electric current and voltage are all difficult to be accurately controlled,
The problems such as screen body display shake, inequality can be caused.
Therefore, how the display brightness of precise control OLED be those skilled in the art's urgent need to resolve technical problem.
The content of the invention
It is an object of the invention to provide a kind of image element circuit and its driving method, display panel and display device, can
The display brightness of precise control OLED, eliminates the harmful effect brought during power supply.
To achieve the above object, the present invention provides a kind of image element circuit, including：The first transistor, transistor seconds, the 3rd
Transistor, electric capacity and Organic Light Emitting Diode, wherein,
The grid of the first transistor is connected to one first control signal, the first electrode connection of the first transistor
In a data-signal, the second electrode of the first transistor is connected to one end of the electric capacity；
The grid of the transistor seconds is connected to one second control signal, the first electrode connection of the transistor seconds
In the other end of the electric capacity, the second electrode of the transistor seconds is connected to a power supply voltage signal；
The grid of the third transistor is connected to the other end of the electric capacity, and the first electrode of the third transistor connects
The Organic Light Emitting Diode is connected to, the second electrode of the third transistor is connected to the power supply voltage signal.
Optionally, the anode of the Organic Light Emitting Diode is connected to the first electrode of the third transistor, described to have
The negative electrode of machine light emitting diode is connected to earth terminal.
Optionally, also including one the 4th transistor, the 4th transistor is connected to the two of the Organic Light Emitting Diode
End.
Optionally, the grid of the 4th transistor is connected to one the 3rd control signal, the first of the 4th transistor
Electrode is connected to the anode of the Organic Light Emitting Diode, and the second electrode of the 4th transistor is connected to the organic light emission
The negative electrode of diode.
Optionally, the first electrode is source electrode, and the second electrode is drain electrode；Or, the first electrode is drain electrode,
The second electrode is source electrode.
Optionally, first control signal and the second control signal are respectively provided with high level and low level, and high level
Dutycycle is different；3rd control signal is with the data-signal has low level signal in a time period, at it
The remaining time period is high level.
Optionally, the driver' s timing of the image element circuit includes first stage to the 7th stage；In the first stage, described
One control signal, the second control signal, the 3rd control signal and data-signal are high level；In second stage, described
One control signal is low level with the second control signal, and the 3rd control signal is high level with data-signal；In the 3rd rank
Section, first control signal is low level, and second control signal is high level with the 3rd control signal, the data letter
Number low level is changed into from high level；In fourth stage, first control signal, the second control signal are with the 3rd control signal
High level, the data-signal is low level；In the 5th stage, first control signal, the second control signal are controlled with the 3rd
Signal processed is low level, and the data-signal is high level；In the 6th stage, first control signal is low level, described
Second control signal, the 3rd control signal and data-signal are high level；In the 7th stage, first control signal, second
Control signal, the 3rd control signal and data-signal are high level.
Accordingly, the present invention also provides a kind of driving method of image element circuit, is applied to image element circuit as described above, institute
The driving method for stating image element circuit includes：
First stage：All transistors are turned off, and Organic Light Emitting Diode is closed；
Second stage：The first transistor is turned on transistor seconds, and power supply voltage signal is stored with the voltage of data-signal
In electric capacity；
Phase III：The transistor seconds is closed, and the data-signal is mutually changed in the stage low and high level, electric capacity
Voltage near the transistor seconds side is changed so that third transistor is turned on, and Organic Light Emitting Diode is in power supply
Lighted under the driving of voltage signal；
Fourth stage：The first transistor ends with transistor seconds, and the voltage at the electric capacity two ends keeps constant, institute
State third transistor constant conduction, the Organic Light Emitting Diode continuous illumination；
5th stage：The first transistor is turned on transistor seconds, the third transistor cut-off, organic hair
Optical diode is closed；4th transistor turns, the Organic Light Emitting Diode shorted on both ends；
6th stage：The transistor seconds is closed, and the Organic Light Emitting Diode is remained turned-off；
7th stage：The first transistor is closed, and the Organic Light Emitting Diode is remained turned-off.
Accordingly, the present invention also provides a kind of display panel, including image element circuit as described above.
Accordingly, the present invention also provides a kind of display device, including display panel as described above.
Compared with prior art, the present invention is provided image element circuit and its driving method, display panel and display device tool
There is following beneficial effect：
1st, the grid of the first transistor connects the first control signal, first electrode connection data-signal, second electrode connection
One end of electric capacity；The grid of transistor seconds connects the second control signal, and first electrode connects the other end of electric capacity, second electrode
Connection power supply voltage signal；The grid of third transistor connects one end of electric capacity, and first electrode connects Organic Light Emitting Diode, the
Two electrodes connect power supply voltage signal；It is brilliant by described in the SECO of first control signal and the second control signal first
Body pipe, the conducting of transistor seconds and shut-in time, so that the magnitude of voltage at the electric capacity two ends is controlled, by the change of magnitude of voltage
The ON time of the third transistor is controlled, so that the dutycycle of lighting time that adjusts OLED in a cycle, realizes
The precise control of OLED brightness；
2nd, it is connected with the 4th transistor at the two ends of Organic Light Emitting Diode, the first electrode of the 4th transistor and the
Two electrodes are connected to the two ends of the Organic Light Emitting Diode, and the grid of the 4th transistor is connected to the 3rd control signal；
By the conducting of the 4th transistor described in the SECO of the 3rd control signal so that the two ends of the Organic Light Emitting Diode are short
Connect, the influence of the Organic Light Emitting Diode parasitic capacitance is eliminated with this so that the black state of display picture is more black.
Brief description of the drawings
The structural representation of the image element circuit that Fig. 1 is provided by one embodiment of the invention；
The timing diagram of each signal in the image element circuit that Fig. 2 is provided by one embodiment of the invention.
Specific embodiment
To make present disclosure more clear understandable, below in conjunction with Figure of description, present disclosure is done into one
Step explanation.Certainly the invention is not limited in the specific embodiment, general replacement well known to the skilled artisan in the art is also contained
Lid is within the scope of the present invention.
Secondly, the present invention has carried out detailed statement using schematic diagram, when the embodiment of the present invention is described in detail, for the ease of saying
Bright, schematic diagram, should not be to this as restriction of the invention not according to general ratio partial enlargement.
One of core concept of the invention is that the present invention provides a kind of image element circuit, including：The first transistor, second
Transistor, third transistor, electric capacity and light emitting diode, wherein, the grid of the first transistor is connected to one first control
Signal processed, the first electrode of the first transistor is connected to a data-signal, the second electrode connection of the first transistor
In one end of the electric capacity；The grid of the transistor seconds is connected to one second control signal, the of the transistor seconds
One electrode is connected to the other end of the electric capacity, and the second electrode of the transistor seconds is connected to a power supply voltage signal；Institute
The grid for stating third transistor is connected to the other end of the electric capacity, and the first electrode of the third transistor is connected to the hair
Optical diode, the second electrode of the third transistor is connected to the power supply voltage signal.
The first transistor, second described in the SECO that the present invention passes through first control signal and the second control signal
The conducting of transistor and shut-in time, so as to control the magnitude of voltage at the electric capacity two ends, controlled by the change of magnitude of voltage described
The ON time of third transistor, so that the dutycycle of lighting time that adjusts OLED in a cycle, realizes OLED brightness
Precise control.
The display panel or display device that include image element circuit as described above that the present invention is provided, can be by control
The dutycycle of OLED fluorescent lifetimes, more precisely controls OLED illumination display brightness, can eliminate and use power supply in the prior art
The harmful effect brought during control brightness regulation, improves picture display effect.
Image element circuit provided by the present invention and its driving method, display panel and display device are made below in conjunction with accompanying drawing
Further describe.
The structural representation of the image element circuit that Fig. 1 is provided by one embodiment of the invention, as shown in figure 1, the present invention is proposed
One image element circuit, including the first transistor T1, transistor seconds T2, third transistor T3, electric capacity C and Organic Light Emitting Diode
OLED, wherein, the grid of the first transistor T1 is connected to one first control signal S1, the first of the first transistor T1
Electrode is connected to a data-signal VDATA, and the second electrode of the first transistor T1 is connected to a ends of the electric capacity C；It is described
The grid of transistor seconds T2 be connected to one second control signal S2, the transistor seconds T2 first electrode be connected to it is described
The b ends of electric capacity C, the second electrode of the transistor seconds T2 is connected to a power supply voltage signal VDD；The third transistor T3
Grid be connected to the b ends of the electric capacity C, the first electrode of the third transistor T3 is connected to the Organic Light Emitting Diode
The second electrode of OLED, the third transistor T3 is connected to the power supply voltage signal VDD.
The image element circuit also includes that the 4th transistor T4, the 4th transistor T4 are connected to the organic light-emitting diodes
The two ends of pipe OLED.Specifically, the grid of the 4th transistor T4 is connected to one the 3rd control signal EN, the 4th crystal
The first electrode of pipe T4 is connected to the anode of the Organic Light Emitting Diode OLED, and the second electrode of the 4th transistor T4 connects
It is connected to the negative electrode of the Organic Light Emitting Diode OLED.It is brilliant that the anode of the Organic Light Emitting Diode OLED is connected to the described 3rd
The first electrode of body pipe T3, the negative electrode of the Organic Light Emitting Diode OLED is connected to earth terminal GND.
In the present embodiment, the first electrode is source electrode, and the second electrode is drain electrode；Or the first electrode is leakage
Pole, the second electrode is source electrode.The transistor used in all embodiments of the invention can be that thin film transistor (TFT) or field are imitated
Should manage or other characteristic identical devices.Preferably, the first transistor T1, transistor seconds T2, third transistor T3 with
4th transistor T4 is thin film transistor (TFT), it is furthermore preferred that the first transistor T1, transistor seconds T2, third transistor
T3 and the 4th transistor T4 can be low-temperature polysilicon film transistor, oxide semiconductor thin-film transistor or amorphous silicon membrane
Transistor.
According to the difference of transistor channel type, can by transistor be divided into p channel transistor (referred to as P-type transistor) and
N-channel transistor (referred to as N-type transistor).In the present embodiment, it is brilliant that the transistor T4 of the first transistor T1 to the 4th are p-type
Body pipe, turns on during low level.In other embodiments, the transistor T4 of the first transistor T1 to the 4th can also be brilliant for N-type
Body pipe, turns on during high level, while needing to be adjusted correspondingly the sequential of each signal.It should be understood that the first transistor
The transistor T4 of T1 to the 4th can also be different types of thin film transistor (TFT), such as, and the first transistor T1 to third transistor T3
It is P-type transistor, and the 4th transistor T4 is N-type transistor.
The first control signal S1 and the second control signal S2 are respectively provided with high level and low level, and high level duty
It is high in the second control signal S2 than difference, it is preferred that the dutycycle of high level is 25% in the first control signal S1
The dutycycle of level is 75%.The dutycycle of the high level refers to high level ratio shared in one cycle.And institute
Stating the first control signal S1 and the second control signal S2 has the high level for overlapping, the low level for overlapping, and also
Stage with respective varying level, such as the second control signal S2 described in when described first control signal S1 is low level is height
Level.The 3rd control signal EN and data-signal VDATA is has low level signal within a time period,
It is high level in remaining time period, in same period, the low level stage of the data-signal VDATA is earlier than the described 3rd control
The low level stage of signal EN processed.The first control signal S1, the second control signal S2, the 3rd control signal EN, institute
Stating data-signal VDATA and the power supply voltage signal VDD can be provided by external circuit, it is preferred that the power supply electricity
Pressure signal VDD is provided by outside supply voltage, and the data-signal VDATA is provided by data driver, the 3rd control
Signal EN is provided by emission control driver.
The timing diagram of each signal in the image element circuit that Fig. 2 is provided by one embodiment of the invention, as shown in Fig. 2 the picture
The Timing driver sequential of plain circuit includes first stage to the 7th stage；H1, the first control signal S1, in the first stage
Two control signal S2, the 3rd control signal EN and data-signal VDATA are high level；In second stage H2, described first
Control signal S1 and the second control signal S2 is low level, and the 3rd control signal EN and data-signal VDATA is high level；
In phase III H3, the first control signal S1 is low level, and the second control signal S2 and the 3rd control signal EN is
High level, data-signal VDATA high level before this, is changed into low level by high level afterwards；It is described in fourth stage H4
First control signal S1, the second control signal S2 and the 3rd control signal EN are high level, and the data-signal VDATA is low electricity
It is flat；In the 5th stage H5, the first control signal S1, the second control signal S2 and the 3rd control signal EN are low level, institute
Data-signal VDATA is stated for high level；In the 6th stage H6, the first control signal S1 is low level, second control
Signal S2, the 3rd control signal EN and data-signal VDATA are high level；In the 7th stage H7, the first control signal S1,
Second control signal S2, the 3rd control signal EN and data-signal VDATA are high level.
Accordingly, the present invention also provides a kind of driving method of image element circuit, drives image element circuit as described above.It is described
The driving method of image element circuit includes：
First stage：All transistors are turned off, and Organic Light Emitting Diode is closed；
Second stage：, the first transistor and transistor seconds turned on, and power supply voltage signal is stored with the voltage of data-signal
In electric capacity；
Phase III：The transistor seconds is closed, and the data-signal is mutually changed in the stage low and high level, electric capacity
Voltage near the transistor seconds side is changed so that third transistor is turned on, and Organic Light Emitting Diode is in power supply
Lighted under the driving of voltage signal；
Fourth stage：The first transistor ends with transistor seconds, and the voltage at the electric capacity two ends keeps constant, institute
State third transistor constant conduction, the Organic Light Emitting Diode continuous illumination；
5th stage：The first transistor is turned on transistor seconds, the third transistor cut-off, organic hair
Optical diode is closed；4th transistor turns, the Organic Light Emitting Diode shorted on both ends；
6th stage：The transistor seconds is closed, and the Organic Light Emitting Diode is remained turned-off；
7th stage：The first transistor is closed, and the Organic Light Emitting Diode is remained turned-off.
So that transistor is P-type transistor as an example, the signal timing diagram shown in Fig. 2 is refer to, and combine the picture shown in Fig. 1
The structural representation of plain circuit, the driving method to image element circuit provided by the present invention is described in further detail.
H1 in the first stage：The stage is preproduction phase, the first control signal S1, the second control signal S2, the 3rd
Control signal EN and data-signal VDATA are high level, the first transistor T1, transistor seconds T2, the 3rd crystal
Pipe T3 and the 4th transistor T4 are turned off, and now the Organic Light Emitting Diode OLED is closed.
In second stage H2：The first control signal S1 and the second control signal S2 is low level, the first crystal
Pipe T1 and transistor seconds T2 is turned on, and the power supply voltage signal VDD and data-signal VDATA is high level, the power supply electricity
The voltage of the high level of pressure signal VDD and data-signal VDATA is stored in the electric capacity C.The now third transistor T3
End with the 4th transistor T4.
In phase III H3：The first control signal S1 keeps low level, and the second control signal S2 is changed into electricity high
Flat, the first transistor T1 is held on, the transistor seconds T2 cut-offs, and the data-signal VDATA is to the electric capacity
A ends charge, the power supply voltage signal VDD stops charging the b ends of the electric capacity.In the stage, the front half section time (also may be used
To be phase III H3 1/3rd, a quarter or more or less time) the data-signal VDATA is electricity high
Flat, the data-signal VDATA still fills high voltage to a ends of electric capacity C, and latter half (can also be phase III H3 tri-
/ bis-, 3/4ths or less or more time) the data-signal VDATA is changed into low level, the data-signal
VDATA fills low-voltage to a ends of the electric capacity C, because the b ends of electric capacity C are hanging, and because the data-signal VDATA declines
Δ V (is changed into low level voltage drop) from high level, then the b terminal voltages of the electric capacity C are changed into VDD-Δ V, the 3rd crystal
The grid voltage reduction of pipe T3, the third transistor T3 conductings, the Organic Light Emitting Diode OLED is in the supply voltage
Lighted under the driving of signal VDD.
In fourth stage H4：The first control signal S1 and the second control signal S2 is high level, the first crystal
Pipe T1 and transistor seconds T2 ends, and the voltage at the electric capacity C two ends keeps constant, the third transistor T3 constant conductions,
Organic Light Emitting Diode OLED continuous illuminations.
In the 5th stage H5：The first control signal S1 and the second control signal S2 is low level, the first crystal
Pipe T1 and transistor seconds T2 is turned on, and the voltage at the b ends of the electric capacity C is increased to VDD, the third transistor T3 cut-offs, institute
State Organic Light Emitting Diode OLED closings.Now the 3rd control signal EN is low level, the 4th transistor T4 conductings,
The Organic Light Emitting Diode OLED negative electrodes and anode shorted on both ends, so as to eliminate the parasitic electricity of the Organic Light Emitting Diode OLED
The influence of appearance so that the black state of display picture is more black.
In the 6th stage H6：The first control signal S1 keeps low level, and the second control signal S2 is changed into electricity high
Flat, the first transistor T1 is held on, and the transistor seconds T2 cut-offs, the voltage at the electric capacity C two ends is constant, described
Third transistor T3 ends, and the Organic Light Emitting Diode OLED is remained turned-off.
In the 7th stage H7：The first control signal S1 is changed into high level, and the second control signal S2 keeps electricity high
Flat, the first transistor T1 and transistor seconds T2 is turned off, and the voltage at the electric capacity C two ends is constant, the 3rd crystal
Pipe T3 keeps cut-off, and the Organic Light Emitting Diode OLED is remained turned-off.
More than complete first stage H1 to the 7th stage H7 to complete a drive cycle, within each cycle, the
The second half section of three stage H3 and fourth stage H4, the Organic Light Emitting Diode OLED light.Each stage can be adjusted one
Shared ratio increases or decreases the fluorescent lifetime of the Organic Light Emitting Diode OLED in the individual cycle, therefore, it can pass through
Timing waveform controls the shared ratio in a cycle of the glow phase of Organic Light Emitting Diode OLED, i.e. dutycycle, realizes
The accurate adjustment of OLED brightness.
When transistor is N-type transistor, the low and high level of all signals is homogeneous in the signal timing diagram shown in Fig. 2
Instead.For example：H1 in the first stage：The stage is preproduction phase, the first control signal S1, the second control signal S2, the 3rd
Control signal EN and data-signal VDATA are low level, the first transistor T1, transistor seconds T2, the 3rd crystal
Pipe T3 and the 4th transistor T4 are turned off, and now the Organic Light Emitting Diode OLED is closed.
In second stage H2：The first control signal S1 and the second control signal S2 is high level, the first crystal
Pipe T1 and transistor seconds T2 is turned on, and the power supply voltage signal VDD and data-signal VDATA is low level, the power supply electricity
The low level voltage of pressure signal VDD and data-signal VDATA is stored in the electric capacity C.The now third transistor T3
End with the 4th transistor T4.
In phase III H3：The first control signal S1 keeps high level, the second control signal S2 to be changed into low electricity
Flat, the first transistor T1 is held on, the transistor seconds T2 cut-offs, and the data-signal VDATA is to the electric capacity
A ends charge, the power supply voltage signal VDD stops charging the b ends of the electric capacity.In the stage, the front half section time (also may be used
To be phase III H3 1/3rd, a quarter or more or less time) the data-signal VDATA is low electricity
Flat, the data-signal VDATA still fills low-voltage to a ends of electric capacity C, and latter half (can also be phase III H3 tri-
/ bis-, 3/4ths or less or more time) the data-signal VDATA is changed into high level, the data-signal
VDATA fills high voltage to a ends of the electric capacity C, because the b ends of electric capacity C are hanging, and because the data-signal VDATA rises
Δ V (is changed into the voltage liter of high level from low level), then the b terminal voltages of the electric capacity C are changed into VDD+ Δs V, the 3rd crystal
The grid voltage of pipe T3 is raised, the third transistor T3 conductings, and the Organic Light Emitting Diode OLED is in the supply voltage
Lighted under the driving of signal VDD.
In fourth stage H4：The first control signal S1 and the second control signal S2 is low level, the first crystal
Pipe T1 and transistor seconds T2 ends, and the voltage at the electric capacity C two ends keeps constant, the third transistor T3 constant conductions,
Organic Light Emitting Diode OLED continuous illuminations.
In the 5th stage H5：The first control signal S1 and the second control signal S2 is high level, the first crystal
Pipe T1 and transistor seconds T2 is turned on, and the voltage at the b ends of the electric capacity C is reduced to VDD, the third transistor T3 cut-offs, institute
State Organic Light Emitting Diode OLED closings.Now the 3rd control signal EN is high level, the 4th transistor T4 conductings,
The Organic Light Emitting Diode OLED negative electrodes and anode shorted on both ends, so as to eliminate the parasitic electricity of the Organic Light Emitting Diode OLED
The influence of appearance so that the black state of display picture is more black.
In the 6th stage H6：The first control signal S1 keeps high level, the second control signal S2 to be changed into low electricity
Flat, the first transistor T1 is held on, and the transistor seconds T2 cut-offs, the voltage at the electric capacity C two ends is constant, described
Third transistor T3 ends, and the Organic Light Emitting Diode OLED is remained turned-off.
In the 7th stage H7：The first control signal S1 is changed into low level, and the second control signal S2 keeps low electricity
Flat, the first transistor T1 and transistor seconds T2 is turned off, and the voltage at the electric capacity C two ends is constant, the 3rd crystal
Pipe T3 keeps cut-off, and the Organic Light Emitting Diode OLED is remained turned-off.
When the transistor T4 of the first transistor T1 to the 4th are different types of transistors, it is necessary to according to actual conditions
Sequential to each signal is adjusted, and is turned on during low level when meeting P-type transistor, is turned on during high level during N-type transistor
Can.
Within each cycle, in second half section and the fourth stage H4, the Organic Light Emitting Diode of phase III H3
OLED lights.Each stage shared in one cycle ratio can be adjusted to increase or decrease the Organic Light Emitting Diode
The fluorescent lifetime of OLED, therefore, it can control the glow phase of Organic Light Emitting Diode OLED in a week by timing waveform
Shared ratio, i.e. dutycycle in phase, realize the accurate adjustment of OLED brightness.
Accordingly, the present invention also provides a kind of display panel, comprising image element circuit as described above.
Accordingly, the present invention also provides a kind of display device, comprising display panel as described above.
In sum, the present invention is provided image element circuit and its driving method, display panel and display device, first crystal
The grid of pipe connects the first control signal, and first electrode connection data-signal, second electrode connects one end of electric capacity；Second crystal
The grid of pipe connects the second control signal, and first electrode connects the other end of electric capacity, second electrode connection power supply voltage signal；The
The grid of three transistors connects one end of electric capacity, first electrode connection Organic Light Emitting Diode, second electrode connection supply voltage
Signal；By the first transistor described in the SECO of first control signal and the second control signal, transistor seconds
Conducting and shut-in time, so as to control the magnitude of voltage at the electric capacity two ends, the 3rd crystal is controlled by the change of magnitude of voltage
The ON time of pipe, so that the dutycycle of lighting time that adjusts OLED in a cycle, realizes the precise control of OLED brightness.
Further, the 4th transistor, the first of the 4th transistor are connected with the two ends of Organic Light Emitting Diode
Electrode is connected to the two ends of the Organic Light Emitting Diode with second electrode, and the grid of the 4th transistor is connected to the 3rd control
Signal processed；By the conducting of the 4th transistor described in the SECO of the 3rd control signal so that the Organic Light Emitting Diode
Shorted on both ends, the influence of the Organic Light Emitting Diode parasitic capacitance is eliminated with this so that the black state of display picture is more black.
Foregoing description is only the description to present pre-ferred embodiments, not to any restriction of the scope of the invention, this hair
Any change, modification that the those of ordinary skill in bright field does according to the disclosure above content, belong to the protection of claims
Scope.
Claims (10)
1. a kind of image element circuit, it is characterised in that including：The first transistor, transistor seconds, third transistor, electric capacity and
Organic Light Emitting Diode, wherein,
The grid of the first transistor is connected to one first control signal, and the first electrode of the first transistor is connected to one
Data-signal, the second electrode of the first transistor is connected to one end of the electric capacity；
The grid of the transistor seconds is connected to one second control signal, and the first electrode of the transistor seconds is connected to institute
The other end of electric capacity is stated, the second electrode of the transistor seconds is connected to a power supply voltage signal；
The grid of the third transistor is connected to the other end of the electric capacity, and the first electrode of the third transistor is connected to
The Organic Light Emitting Diode, the second electrode of the third transistor is connected to the power supply voltage signal.
2. image element circuit as claimed in claim 1, it is characterised in that the anode of the Organic Light Emitting Diode is connected to described
The first electrode of third transistor, the negative electrode of the Organic Light Emitting Diode is connected to earth terminal.
3. image element circuit as claimed in claim 2, it is characterised in that also including one the 4th transistor, the 4th transistor
It is connected to the two ends of the Organic Light Emitting Diode.
4. image element circuit as claimed in claim 3, it is characterised in that the grid of the 4th transistor is connected to one the 3rd control
Signal processed, the first electrode of the 4th transistor is connected to the anode of the Organic Light Emitting Diode, the 4th transistor
Second electrode be connected to the negative electrode of the Organic Light Emitting Diode.
5. the image element circuit as any one of Claims 1 to 4, it is characterised in that the first electrode is source electrode, described
Second electrode is drain electrode；Or, the first electrode is drain electrode, and the second electrode is source electrode.
6. the image element circuit as any one of Claims 1 to 4, it is characterised in that first control signal and second
Control signal is respectively provided with high level and low level, and the dutycycle of high level is different；3rd control signal and the data
Signal is has low level signal in a time period, is high level in remaining time period.
7. the image element circuit as any one of Claims 1 to 4, it is characterised in that the driver' s timing of the image element circuit
Including the first stage to the 7th stage；In the first stage, first control signal, the second control signal, the 3rd control signal
And data-signal is high level；In second stage, first control signal is low level with the second control signal, described
3rd control signal is high level with data-signal；In the phase III, first control signal is low level, second control
Signal processed and the 3rd control signal are high level, and the data-signal is changed into low level from high level；In fourth stage, described
One control signal, the second control signal are high level with the 3rd control signal, and the data-signal is low level；In the 5th rank
Section, first control signal, the second control signal are low level with the 3rd control signal, and the data-signal is high level；
In the 6th stage, first control signal is low level, and second control signal, the 3rd control signal and data-signal are
High level；In the 7th stage, first control signal, the second control signal, the 3rd control signal and data-signal are
High level.
8. a kind of driving method of image element circuit, it is characterised in that be applied to the picture as any one of claim 1~7
Plain circuit, the driving method of the image element circuit includes：
First stage：All transistors are turned off, and Organic Light Emitting Diode is closed；
Second stage：The first transistor is turned on transistor seconds, and power supply voltage signal is stored in electricity with the voltage of data-signal
Rong Zhong；
Phase III：The transistor seconds is closed, and the data-signal is mutually changed in the stage low and high level, and electric capacity is close to
The voltage of the transistor seconds side is changed so that third transistor is turned on, and Organic Light Emitting Diode is in supply voltage
Lighted under the driving of signal；
Fourth stage：The first transistor and transistor seconds end, and the voltage at the electric capacity two ends keeps constant, and described the
Three transistor constant conductions, the Organic Light Emitting Diode continuous illumination；
5th stage：The first transistor is turned on transistor seconds, the third transistor cut-off, the organic light emission two
Pole pipe is closed；4th transistor turns, the Organic Light Emitting Diode shorted on both ends；
6th stage：The transistor seconds is closed, and the Organic Light Emitting Diode is remained turned-off；
7th stage：The first transistor is closed, and the Organic Light Emitting Diode is remained turned-off.
9. a kind of display panel, it is characterised in that including the image element circuit as any one of claim 1~7.
10. a kind of display device, it is characterised in that including the display panel described in claim 9.
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