CN106847188B - Pixel circuit and its driving method, display panel and display device - Google Patents
Pixel circuit and its driving method, display panel and display device Download PDFInfo
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- CN106847188B CN106847188B CN201710210549.7A CN201710210549A CN106847188B CN 106847188 B CN106847188 B CN 106847188B CN 201710210549 A CN201710210549 A CN 201710210549A CN 106847188 B CN106847188 B CN 106847188B
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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
-
- 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
Abstract
The present invention provides a kind of pixel circuit and its driving method, display panel and display device, pixel circuit includes three transistors, a capacitor and an Organic Light Emitting Diode, the grid of the first transistor connects first control signal, first electrode connects data-signal, and second electrode connects one end of capacitor；The grid of second transistor connects second control signal, and first electrode connects the other end of capacitor, and second electrode connects power supply voltage signal；One end of the grid connection capacitor of third transistor, first electrode connect Organic Light Emitting Diode, and second electrode connects power supply voltage signal；Conducting and shut-in time by the timing control the first transistor, second transistor of first control signal and second control signal, to control the voltage value at the capacitor both ends, the turn-on time of the third transistor is controlled by the variation of voltage value, so as to adjust the duty ratio of OLED lighting time in one cycle, the accurate control of OLED brightness is realized.
Description
Technical field
The present invention relates to flat panel display technology fields, and in particular to a kind of pixel circuit and its driving method, display panel
With display device.
Background technique
Organic luminescent device, i.e. Organic Light Emitting Diode (Organic Light-Emitting Diode, abbreviation OLED),
Also known as ORGANIC ELECTROLUMINESCENCE DISPLAYS (Organic Electroluminesence Display, abbreviation OLED) has wide view
The advantages that angle, high brightness, high contrast, low energy consumption, more frivolous volume is current flat panel display focus of attention.
In OLED lighting area, mainly controlled by controlling the electric current for flowing through OLED or the voltage at OLED both ends
OLED display brightness, but since the influence of other disturbing factors such as noise, electric current and voltage are all difficult to realize be accurately controlled,
The problems such as will cause screen body display shake, unevenness.
Therefore, the technical issues of display brightness of OLED is those skilled in the art's urgent need to resolve how is accurately controlled.
Summary of the invention
The purpose of the present invention is to provide a kind of pixel circuit and its driving methods, display panel and display device, can
The display brightness of accurate control OLED, bring adverse effect when eliminating power supply control.
To achieve the above object, the present invention provides a kind of pixel circuit, comprising: the first transistor, second transistor, third
Transistor, capacitor and Organic Light Emitting Diode, wherein
The grid of the first transistor is connected to a 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 capacitor；
The grid of the second transistor is connected to a second control signal, the first electrode connection of the second transistor
In the other end of the capacitor, the second electrode of the second transistor is connected to a power supply voltage signal；
The grid of the third transistor is connected to the other end of the capacitor, and the first electrode of the third transistor connects
It is connected to the Organic Light Emitting Diode, 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 cathode of machine light emitting diode is connected to ground terminal.
It optionally, further include 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 be connected to a third 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 cathode of diode.
Optionally, the first electrode is source electrode, and the second electrode is drain electrode；Alternatively, the first electrode is drain electrode,
The second electrode is source electrode.
Optionally, the first control signal and second control signal all have high level and low level, and high level
Duty ratio is different；The third control signal and the data-signal are to have low level signal in a period, at it
The remaining period is high level.
Optionally, the driver' s timing of the pixel circuit includes first stage to the 7th stage；In the first stage, described
One control signal, second control signal, third control signal and data-signal are high level；In second stage, described
One control signal and second control signal are low level, and the third control signal and data-signal are high level；In third rank
Section, the first control signal are low level, and the second control signal and third control signal are high level, the data letter
Number low level is become from high level；In fourth stage, the first control signal, second control signal and third control signal are
High level, the data-signal are low level；In the 5th stage, the first control signal, second control signal and third control
Signal processed is low level, and the data-signal is high level；In the 6th stage, the first control signal is low level, described
Second control signal, third control signal and data-signal are high level；In the 7th stage, the first control signal, second
Controlling signal, third control signal and data-signal is high level.
Correspondingly, being applied to pixel circuit as described above, institute the present invention also provides a kind of driving method of pixel circuit
The driving method for stating pixel circuit includes:
First stage: all transistors are turned off, and Organic Light Emitting Diode is closed；
Second stage: the first transistor is connected with second transistor, the voltage storage of power supply voltage signal and data-signal
In capacitor；
Phase III: the second transistor is closed, and the data-signal at this stage mutually convert by low and high level, capacitor
Voltage close to the second transistor side changes, so that third transistor is connected, Organic Light Emitting Diode is in power supply
It shines under the driving of voltage signal；
Fourth stage: the first transistor and second transistor end, and the voltage at the capacitor both ends remains unchanged, institute
State third transistor constant conduction, the Organic Light Emitting Diode continuous illumination；
5th stage: the first transistor is connected with second transistor, 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 second transistor is closed, and the Organic Light Emitting Diode remains turned-off；
7th stage: the first transistor is closed, and the Organic Light Emitting Diode remains turned-off.
Correspondingly, the present invention also provides a kind of display panel, including pixel circuit as described above.
Correspondingly, the present invention also provides a kind of display device, including display panel as described above.
Compared with prior art, pixel circuit and its driving method provided by the invention, display panel and display device have
Have it is following the utility model has the advantages that
1, the grid of the first transistor connects first control signal, and first electrode connects data-signal, second electrode connection
One end of capacitor；The grid of second transistor connects second control signal, and first electrode connects the other end of capacitor, second electrode
Connect power supply voltage signal；One end of the grid connection capacitor of third transistor, first electrode connect Organic Light Emitting Diode, the
Two electrodes connect power supply voltage signal；It is brilliant by described in the timing control of the first control signal and second control signal first
Body pipe, the conducting of second transistor and shut-in time pass through the variation of voltage value to control the voltage value at the capacitor both ends
The turn-on time of the third transistor is controlled, so as to adjust the duty ratio of OLED lighting time in one cycle, is realized
The accurate control of OLED brightness；
2, the 4th transistor is connected at the both ends of Organic Light Emitting Diode, the first electrode of the 4th transistor and the
Two electrodes are connected to the both ends of the Organic Light Emitting Diode, and the grid of the 4th transistor is connected to third control signal；
The conducting that the 4th transistor described in the timing control of signal is controlled by third, so that the both ends of the Organic Light Emitting Diode are short
It connects, 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.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of pixel circuit provided by one embodiment of the invention；
Fig. 2 is the timing diagram of each signal in pixel circuit provided by one embodiment of the invention.
Specific embodiment
To keep the contents of the present invention more clear and easy to understand, below in conjunction with Figure of description, the contents of the present invention are done into one
Walk explanation.Certainly the invention is not limited to the specific embodiment, and general replacement well known to those skilled 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 describing the embodiments of the present invention, for the ease of saying
Bright, schematic diagram is not partially enlarged in proportion to the general scale, should not be to this as restriction of the invention.
One of core of the invention thought is that the present invention provides a kind of pixel circuit, comprising: the first transistor, second
Transistor, third transistor, capacitor 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 are connected to a data-signal, the second electrode connection of the first transistor
In one end of the capacitor；The grid of the second transistor is connected to a second control signal, and the of the second transistor
One electrode is connected to the other end of the capacitor, and the second electrode of the second transistor is connected to a power supply voltage signal；Institute
The grid for stating third transistor is connected to the other end of the capacitor, and the first electrode of the third transistor is connected to the hair
Optical diode, the second electrode of the third transistor are connected to the power supply voltage signal.
The present invention passes through the first transistor described in the timing control of the first control signal and second control signal, second
The conducting of transistor and shut-in time, so that the voltage value at the capacitor both ends is controlled, described in the variation control by voltage value
The turn-on time of third transistor realizes OLED brightness so as to adjust the duty ratio of OLED lighting time in one cycle
Accurate control.
Provided by the invention includes the display panel or display device of pixel circuit as described above, can pass through control
The duty ratio of OLED fluorescent lifetime more precisely controls OLED illumination display brightness, can eliminate in the prior art using power supply
Bring adverse effect when controlling brightness regulation improves picture display effect.
Pixel circuit provided by the present invention and its driving method, display panel and display device are made below in conjunction with attached drawing
It is further described.
Fig. 1 is the structural schematic diagram of pixel circuit provided by one embodiment of the invention, as shown in Figure 1, the present invention proposes
One pixel circuit, including the first transistor T1, second transistor T2, third transistor T3, capacitor C and Organic Light Emitting Diode
OLED, wherein the grid of the first transistor T1 is connected to a first control signal S1, and 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 the end a of the capacitor C；It is described
The grid of second transistor T2 is connected to a second control signal S2, and the first electrode of the second transistor T2 is connected to described
The end b of capacitor C, the second electrode of the second transistor T2 are connected to a power supply voltage signal VDD；The third transistor T3
Grid be connected to the end b of the capacitor C, the first electrode of the third transistor T3 is connected to the Organic Light Emitting Diode
OLED, the second electrode of the third transistor T3 are connected to the power supply voltage signal VDD.
The pixel circuit further includes the 4th transistor T4, and the 4th transistor T4 is connected to the organic light-emitting diodes
The both ends of pipe OLED.Specifically, the grid of the 4th transistor T4 is connected to third 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 cathode of the Organic Light Emitting Diode OLED.It is brilliant that the anode of the Organic Light Emitting Diode OLED is connected to the third
The cathode of the first electrode of body pipe T3, the Organic Light Emitting Diode OLED is connected to ground 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 are source electrode.The transistor used in all embodiments of the invention all can be thin film transistor (TFT) or field effect
It should manage or the identical device of other characteristics.Preferably, the first transistor T1, second transistor T2, third transistor T3 with
4th transistor T4 is thin film transistor (TFT), it is furthermore preferred that the first transistor T1, second transistor 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, transistor can 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, the first transistor T1 to the 4th transistor T4 is p-type crystalline substance
Body pipe, when low level, are connected.In other embodiments, the first transistor T1 to the 4th transistor T4 may be N-type crystalline substance
Body pipe, when high level, are connected, while needing to be adjusted correspondingly the timing of each signal.It should be understood that the first transistor
T1 to the 4th transistor T4 is also possible to different types of thin film transistor (TFT), for example, the first transistor T1 to third transistor T3
For P-type transistor, and the 4th transistor T4 is N-type transistor.
The first control signal S1 and second control signal S2 all have high level and low level, and the duty of high level
Than difference, it is preferred that the duty ratio of high level is 25% in the first control signal S1, high in the second control signal S2
The duty ratio of level is 75%.The duty ratio of the high level refers to high level shared ratio in one cycle.And institute
Stating first control signal S1 and second control signal S2 has the high level to overlap, the low level to overlap, and also
Stage with respective varying level, such as when first control signal S1 is low level second control signal S2 are high
Level.The third control signal EN and data-signal VDATA is to have low level signal within a period,
It is high level in remaining period, in same period, the low level stage of the data-signal VDATA is earlier than the third control
The low level stage of signal EN processed.The first control signal S1, second control signal S2, the third 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
Signal VDD is pressed to be provided by external supply voltage, the data-signal VDATA is provided by data driver, the third control
Signal EN is provided by emission control driver.
Fig. 2 is the timing diagram of each signal in pixel circuit provided by one embodiment of the invention, as shown in Fig. 2, the picture
The Timing driver timing of plain circuit includes first stage to the 7th stage；H1 in the first stage, the first control signal S1,
Two control signal S2, third control signal EN and data-signal VDATA are high level；In second stage H2, described first
Controlling signal S1 and second control signal S2 is low level, and the third control signal EN and data-signal VDATA is high level；
It is low level in phase III H3, the first control signal S1, the second control signal S2 is with third control signal EN
High level, data-signal VDATA high level before this, is changed into low level by high level later；It is described in fourth stage H4
First control signal S1, second control signal S2 and third 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, second control signal S2 and third control signal EN are low level, institute
Stating data-signal VDATA is high level；It is low level in the 6th stage H6, the first control signal S1, second control
Signal S2, third control signal EN and data-signal VDATA are high level；In the 7th stage H7, the first control signal S1,
Second control signal S2, third control signal EN and data-signal VDATA are high level.
Correspondingly, driving pixel circuit as described above the present invention also provides a kind of driving method of pixel circuit.It is described
The driving method of pixel circuit includes:
First stage: all transistors are turned off, and Organic Light Emitting Diode is closed；
Second stage:, the first transistor is connected with second transistor, the voltage storage of power supply voltage signal and data-signal
In capacitor；
Phase III: the second transistor is closed, and the data-signal at this stage mutually convert by low and high level, capacitor
Voltage close to the second transistor side changes, so that third transistor is connected, Organic Light Emitting Diode is in power supply
It shines under the driving of voltage signal；
Fourth stage: the first transistor and second transistor end, and the voltage at the capacitor both ends remains unchanged, institute
State third transistor constant conduction, the Organic Light Emitting Diode continuous illumination；
5th stage: the first transistor is connected with second transistor, 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 second transistor is closed, and the Organic Light Emitting Diode remains turned-off；
7th stage: the first transistor is closed, and the Organic Light Emitting Diode remains turned-off.
By taking transistor is P-type transistor as an example, referring to figure 2. shown in signal timing diagram, and picture as shown in connection with fig. 1
The structural schematic diagram of plain circuit is described in further detail the driving method of pixel circuit provided by the present invention.
H1 in the first stage: the stage is preproduction phase, the first control signal S1, second control signal S2, third
Controlling signal EN and data-signal VDATA is high level, the first transistor T1, second transistor T2, third crystal
Pipe T3 and the 4th transistor T4 are turned off, and the Organic Light Emitting Diode OLED is in close state at this time.
In second stage H2: the first control signal S1 and second control signal S2 is low level, the first crystal
Pipe T1 is connected with second transistor T2, and the power supply voltage signal VDD and data-signal VDATA are high level, the power supply electricity
The voltage of the high level of pressure signal VDD and data-signal VDATA is stored in the capacitor C.The third transistor T3 at this time
End with the 4th transistor T4.
In phase III H3: the first control signal S1 keeps low level, and the second control signal S2 becomes high electricity
Flat, the first transistor T1 is held on, and the second transistor T2 cut-off, the data-signal VDATA is to the capacitor
The charging of the end a, the power supply voltage signal VDD stops charging to the end b of the capacitor.At this stage, the front half section time (can also
To be phase III H3 one third, a quarter or more or fewer times) the data-signal VDATA is high electricity
Flat, the data-signal VDATA still fills high voltage to the end a of capacitor C, and latter half (is also possible to phase III H3 tri-
/ bis-, 3/4ths or the less or more time) the data-signal VDATA becomes low level, the data-signal
VDATA fills low-voltage to the end a of the capacitor C, since the end b of capacitor C is hanging, and since the data-signal VDATA declines
Δ V (becomes low level voltage drop from high level), then the end the b voltage of the capacitor C becomes VDD-Δ V, the third crystal
The grid voltage of pipe T3 reduces, and the third transistor T3 conducting, the Organic Light Emitting Diode OLED is in the supply voltage
It shines under the driving of signal VDD.
In fourth stage H4: the first control signal S1 and second control signal S2 is high level, the first crystal
Pipe T1 and second transistor T2 ends, and the voltage at the both ends the capacitor C remains unchanged, the third transistor T3 constant conduction,
Organic Light Emitting Diode OLED continuous illumination.
In the 5th stage H5: the first control signal S1 and second control signal S2 is low level, the first crystal
Pipe T1 is connected with second transistor T2, and the voltage at the end b of the capacitor C is increased to VDD, the third transistor T3 cut-off, institute
State Organic Light Emitting Diode OLED closing.The third control signal EN is low level at this time, the 4th transistor T4 conducting,
The Organic Light Emitting Diode OLED cathode and anode shorted on both ends, 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 becomes high electricity
Flat, the first transistor T1 is held on, and the second transistor T2 cut-off, the voltage at the both ends the capacitor C is constant, described
Third transistor T3 cut-off, the Organic Light Emitting Diode OLED are remained turned-off.
In the 7th stage H7: the first control signal S1 becomes high level, and the second control signal S2 keeps high electricity
Flat, the first transistor T1 and second transistor T2 is turned off, and the voltage at the both ends the capacitor C is constant, the third crystal
Pipe T3 keeps cut-off, and the Organic Light Emitting Diode OLED is remained turned-off.
The above first stage H1 to the 7th stage H7 that completes is to complete a drive cycle, within each period, the
The second half section of three stage H3 and fourth stage H4, the Organic Light Emitting Diode OLED shine.Adjustable each stage is one
In a period therefore shared ratio can pass through to increase or decrease the fluorescent lifetime of the Organic Light Emitting Diode OLED
Timing waveform controls the light emitting phase of Organic Light Emitting Diode OLED shared ratio in one cycle, i.e. duty ratio, realizes
The accurate adjusting of OLED brightness.
When transistor is N-type transistor, the low and high level of all signals is homogeneous in signal timing diagram shown in Fig. 2
Instead.Such as: H1 in the first stage: the stage is preproduction phase, the first control signal S1, second control signal S2, third
Controlling signal EN and data-signal VDATA is low level, the first transistor T1, second transistor T2, third crystal
Pipe T3 and the 4th transistor T4 are turned off, and the Organic Light Emitting Diode OLED is in close state at this time.
In second stage H2: the first control signal S1 and second control signal S2 is high level, the first crystal
Pipe T1 is connected with second transistor T2, and the power supply voltage signal VDD and data-signal VDATA are low level, the power supply electricity
The low level voltage of pressure signal VDD and data-signal VDATA is stored in the capacitor C.The third transistor T3 at this time
End with the 4th transistor T4.
In phase III H3: the first control signal S1 keeps high level, and the second control signal S2 becomes low electricity
Flat, the first transistor T1 is held on, and the second transistor T2 cut-off, the data-signal VDATA is to the capacitor
The charging of the end a, the power supply voltage signal VDD stops charging to the end b of the capacitor.At this stage, the front half section time (can also
To be phase III H3 one third, a quarter or more or fewer times) the data-signal VDATA is low electricity
Flat, the data-signal VDATA still fills low-voltage to the end a of capacitor C, and latter half (is also possible to phase III H3 tri-
/ bis-, 3/4ths or the less or more time) the data-signal VDATA becomes high level, the data-signal
VDATA fills high voltage to the end a of the capacitor C, since the end b of capacitor C is hanging, and since the data-signal VDATA rises
Δ V (the voltage liter for becoming high level from low level), then the end the b voltage of the capacitor C becomes VDD+ Δ V, the third crystal
The grid voltage of pipe T3 increases, and the third transistor T3 conducting, the Organic Light Emitting Diode OLED is in the supply voltage
It shines under the driving of signal VDD.
In fourth stage H4: the first control signal S1 and second control signal S2 is low level, the first crystal
Pipe T1 and second transistor T2 ends, and the voltage at the both ends the capacitor C remains unchanged, the third transistor T3 constant conduction,
Organic Light Emitting Diode OLED continuous illumination.
In the 5th stage H5: the first control signal S1 and second control signal S2 is high level, the first crystal
Pipe T1 is connected with second transistor T2, and the voltage drop at the end b of the capacitor C ends down to VDD, the third transistor T3, institute
State Organic Light Emitting Diode OLED closing.The third control signal EN is high level at this time, the 4th transistor T4 conducting,
The Organic Light Emitting Diode OLED cathode and anode shorted on both ends, 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, and the second control signal S2 becomes low electricity
Flat, the first transistor T1 is held on, and the second transistor T2 cut-off, the voltage at the both ends the capacitor C is constant, described
Third transistor T3 cut-off, the Organic Light Emitting Diode OLED are remained turned-off.
In the 7th stage H7: the first control signal S1 becomes low level, and the second control signal S2 keeps low electricity
Flat, the first transistor T1 and second transistor T2 is turned off, and the voltage at the both ends the capacitor C is constant, the third crystal
Pipe T3 keeps cut-off, and the Organic Light Emitting Diode OLED is remained turned-off.
When the first transistor T1 to the 4th transistor T4 is different types of transistor, need according to the actual situation
The timing of each signal is adjusted, conducting when low level when meeting P-type transistor, is connected when high level when N-type transistor
It can.
Within each period, second half section and fourth stage H4 in phase III H3, the Organic Light Emitting Diode
OLED shines.Adjustable each stage, shared ratio increased or decreased the Organic Light Emitting Diode in one cycle
Therefore the fluorescent lifetime of OLED can control the light emitting phase of Organic Light Emitting Diode OLED in a week by timing waveform
Shared ratio, i.e. duty ratio in phase, realize the accurate adjusting of OLED brightness.
Correspondingly, including pixel circuit as described above the present invention also provides a kind of display panel.
Correspondingly, including display panel as described above the present invention also provides a kind of display device.
In conclusion pixel circuit provided by the invention and its driving method, display panel and display device, first crystal
The grid of pipe connects first control signal, and first electrode connects data-signal, and second electrode connects one end of capacitor；Second crystal
The grid of pipe connects second control signal, and first electrode connects the other end of capacitor, and second electrode connects power supply voltage signal；The
One end of the grid connection capacitor of three transistors, first electrode connect Organic Light Emitting Diode, and second electrode connects supply voltage
Signal；Pass through the first transistor, second transistor described in the timing control of the first control signal and second control signal
Conducting and shut-in time control the third crystal by the variation of voltage value to control the voltage value at the capacitor both ends
The turn-on time of pipe realizes the accurate control of OLED brightness so as to adjust the duty ratio of OLED lighting time in one cycle.
Further, the 4th transistor is connected at the both ends of Organic Light Emitting Diode, the first of the 4th transistor
Electrode and second electrode are connected to the both ends of the Organic Light Emitting Diode, and the grid of the 4th transistor is connected to third control
Signal processed；The conducting that the 4th transistor described in the timing control of signal is controlled by third, 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 display picture black state it 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, the modification that the those of ordinary skill in bright field does according to the disclosure above content, belong to the protection of claims
Range.
Claims (10)
1. a kind of pixel circuit characterized by comprising the first transistor, second transistor, third transistor, capacitor and
Organic Light Emitting Diode, wherein
The grid of the first transistor is connected to a first control signal, and the first electrode of the first transistor is connected to one
Data-signal, the second electrode of the first transistor are connected to one end of the capacitor；
The grid of the second transistor is connected to a second control signal, and the first electrode of the second transistor is connected to institute
The other end of capacitor is stated, the second electrode of the second transistor is connected to a power supply voltage signal；
The grid of the third transistor is connected to the other end of the capacitor, and the first electrode of the third transistor is connected to
The Organic Light Emitting Diode, the second electrode of the third transistor are connected to the power supply voltage signal；
The driver' s timing of the pixel circuit includes first stage to the 7th stage；In the first stage, the first transistor,
Two-transistor and third transistor are turned off, and the Organic Light Emitting Diode is closed；In second stage, the first transistor with
The voltage of second transistor conducting, the third transistor cut-off, the power supply voltage signal and data-signal is stored in capacitor
In, the Organic Light Emitting Diode remains turned-off；In phase III, the first transistor conducting, the second transistor is cut
Only, the data-signal charges to one end of the capacitor, the third transistor stage conducting, the organic light-emitting diodes
Pipe shines；In fourth stage, the first transistor and second transistor end, and the voltage at the capacitor both ends remains unchanged,
The third transistor constant conduction, the Organic Light Emitting Diode continuous illumination；In the 5th stage, the first transistor with
Second transistor conducting, the third transistor cut-off, the Organic Light Emitting Diode are closed；In the 6th stage, described first
Transistor turns, the second transistor and third transistor cut-off, the voltage at the capacitor both ends is constant, the organic light emission
Diode is closed；In the 7th stage, the first transistor, second transistor and third transistor are turned off, organic hair
Optical diode remains turned-off.
2. pixel circuit as described in claim 1, which is characterized in that the anode of the Organic Light Emitting Diode is connected to described
The cathode of the first electrode of third transistor, the Organic Light Emitting Diode is connected to ground terminal.
3. pixel circuit as claimed in claim 2, which is characterized in that further include one the 4th transistor, the 4th transistor
It is connected to the both ends of the Organic Light Emitting Diode.
4. pixel circuit as claimed in claim 3, which is characterized in that the grid of the 4th transistor is connected to a third control
Signal processed, the first electrode of the 4th transistor are connected to the anode of the Organic Light Emitting Diode, the 4th transistor
Second electrode be connected to the cathode of the Organic Light Emitting Diode.
5. the pixel circuit as described in any one of claim 1 ~ 4, which is characterized in that the first electrode is source electrode, described
Second electrode is drain electrode；Alternatively, the first electrode is drain electrode, the second electrode is source electrode.
6. pixel circuit as claimed in claim 4, which is characterized in that the first control signal has with second control signal
There are high level and low level, and the duty ratio of high level is different；The third control signal and the data-signal are one
Period has low level signal, is high level in remaining period.
7. the pixel circuit as described in any one of claim 1 ~ 4, which is characterized in that in the first stage, first control
Signal, second control signal, third control signal and data-signal are high level；In second stage, first control
Signal and second control signal are low level, and the third control signal and data-signal are high level；It is described in the phase III
First control signal is low level, and the second control signal and third control signal are high level, and the data-signal is by height
Level becomes low level；In fourth stage, the first control signal, second control signal and third control signal are high electricity
Flat, the data-signal is low level；In the 5th stage, the first control signal, second control signal and third control are believed
Number be low level, the data-signal be high level；In the 6th stage, the first control signal be low level, described second
Controlling signal, third control signal and data-signal is high level；In the 7th stage, the first control signal, the second control
Signal, third control signal and data-signal are high level.
8. a kind of driving method of pixel circuit, which is characterized in that be applied to the pixel as described in any one of claim 1 ~ 7
The driving method of circuit, the pixel circuit includes:
First stage: all transistors are turned off, and Organic Light Emitting Diode is closed；
Second stage: the first transistor is connected with second transistor, and the voltage of power supply voltage signal and data-signal is stored in electricity
Rong Zhong；
Phase III: the second transistor is closed, and the data-signal at this stage mutually convert by low and high level, and capacitor is close
The voltage of the second transistor side changes, so that third transistor is connected, Organic Light Emitting Diode is in supply voltage
It shines under the driving of signal；
Fourth stage: the first transistor and second transistor end, and the voltage at the capacitor both ends remains unchanged, and described the
Three transistor constant conductions, the Organic Light Emitting Diode continuous illumination；
5th stage: the first transistor is connected with second transistor, 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 second transistor is closed, and the Organic Light Emitting Diode remains turned-off；
7th stage: the first transistor is closed, and the Organic Light Emitting Diode remains turned-off.
9. a kind of display panel, which is characterized in that including the pixel circuit as described in any one of claim 1 ~ 7.
10. a kind of display device, which is characterized in that including display panel as claimed in claim 9.
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| CN109147669B (en) * | 2017-06-15 | 2020-04-10 | 京东方科技集团股份有限公司 | Pixel circuit, driving method thereof and display panel |
| CN107230449A (en) * | 2017-07-12 | 2017-10-03 | 京东方科技集团股份有限公司 | Pixel unit circuit, driving method, image element circuit and display device |
| CN108735161B (en) * | 2018-05-25 | 2020-06-16 | 昆山国显光电有限公司 | Pixel circuit, driving method thereof, OLED display panel and display device |
| CN111402782B (en) * | 2018-12-14 | 2021-09-03 | 成都辰显光电有限公司 | Digital driving pixel circuit and method for digitally driving pixel |
| TWI689913B (en) | 2018-12-25 | 2020-04-01 | 友達光電股份有限公司 | Display device |
| CN109801595A (en) * | 2019-03-07 | 2019-05-24 | 深圳市华星光电半导体显示技术有限公司 | Pixel-driving circuit and display panel |
| TWI696163B (en) | 2019-03-25 | 2020-06-11 | 友達光電股份有限公司 | Control circuit |
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