CN110232893A - A kind of active display, driving method and its pixel circuit - Google Patents
A kind of active display, driving method and its pixel circuit Download PDFInfo
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- CN110232893A CN110232893A CN201810180884.1A CN201810180884A CN110232893A CN 110232893 A CN110232893 A CN 110232893A CN 201810180884 A CN201810180884 A CN 201810180884A CN 110232893 A CN110232893 A CN 110232893A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
- G09G3/3233—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
- G09G3/3241—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element the current through the light-emitting element being set using a data current provided by the data driver, e.g. by using a two-transistor current mirror
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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)
Abstract
A kind of active display, driving method and its pixel circuit, the pixel circuit includes: switch sub-circuit, control sub-circuit, compensation sub-circuit and driving transistor, wherein: the switch sub-circuit reset suitable for the anode to luminescent device and data voltage is written to the driving transistor；Sub-circuit is controlled, is suitable for compensation sub-circuit charging；Control driving light emission drive transistor device shines；Sub-circuit is compensated, the threshold voltage suitable for the compensation driving transistor when driving light emission drive transistor device to shine；Transistor is driven, is suitable for shining in driving luminescent device, and when data voltage signal corresponds to write-in data of the grayscale less than the first preset threshold, work is in sub- Operational Zone, when being greater than the write-in data of the second preset threshold, works in linear zone.Using above-mentioned scheme, organic light emitting display grayscale can be reduced and adjust difficulty, improve the display controllability and uniformity of organic light emitting display.
Description
Technical field
The present embodiments relate to integrated circuit fields more particularly to a kind of active displays, driving method and its pixel
Circuit.
Background technique
In general, organic luminescent device can be classified as passive Organic Light Emitting Diode (Organic Light Emitting
Diode, OLED) and active organic LED (Active MatrixOLED, AMOLED), and according to driving light-emitting component
Mode, can also specifically be classified as electric current driving OLED and voltage driving OLED.
Currently, for active organic LED, corresponding to pixel circuit in active component (usually golden oxygen
Half field effect transistor (Metal-Oxide-Semiconductor Field-Effect Transistor, MOSFET)) it can be with
The electric current for the light-emitting component being arranged for each pixel is flowed through in control.And although active organic LED is with low in energy consumption
Advantage, but the threshold voltage vt h due to driving transistor or mobility [mu] are because the factors such as circuit aging or temperature influence meeting at any time
It changes, or since the loss variable of capacitor is different, therefore for each pixel circuit, flow through the electric current of light-emitting component
Intensity is not identical.
Therefore, there are grayscale to adjust difficulty, shows uncontrollable and non-uniform problem for current organic light emitting display.
Summary of the invention
The embodiment of the present invention solves the problems, such as it is to reduce organic light emitting display grayscale to adjust difficulty, and it is aobvious to improve organic light emission
Show the display controllability and uniformity of device.
To solve the above problems, the pixel circuit includes: switch the embodiment of the invention provides a kind of pixel circuit
Circuit, control sub-circuit, compensation sub-circuit and driving transistor, in which: the switch sub-circuit is suitable in scanning voltage signal
Control under, the anode of luminescent device reset and data voltage is written to the driving transistor；Control
Circuit is suitable under the scanning voltage signal, data voltage signal and transmitting signal control, carries out to the compensation sub-circuit
Charging；And for controlling luminescent device described in the driving transistor driving and shining under data voltage signal control；Institute
Compensation sub-circuit is stated, suitable for fixing the driving transistor gate electrode potential, and deposit in advance under the control of the control sub-circuit
The threshold voltage for storing up the driving transistor, compensates the drive when shining with the luminescent device described in the driving transistor driving
The threshold voltage of dynamic transistor；The driving transistor, suitable for driving the photophore under the control of the control sub-circuit
Part shines, and when the data voltage signal corresponds to write-in data of the grayscale less than the first preset threshold, works in Asian Games row
Area, when the data voltage signal, which corresponds to grayscale, is greater than the write-in data of the second preset threshold, work is in linear zone, and described the
Two preset thresholds are greater than first preset threshold.
Optionally, the switch sub-circuit, comprising: the first transistor, the grid of the first transistor receive reversed
The source electrode of the scanning voltage signal, the source electrode of the first transistor and the driving transistor couples, the first crystal
The drain electrode of pipe receives the data voltage signal.
Optionally, the switch sub-circuit further include: second transistor, in which: the grid of the second transistor receives
The source electrode of the scanning voltage signal, the second transistor receives the data voltage signal, the leakage of the second transistor
The source electrode of pole and the driving transistor couples.
Optionally, the switch sub-circuit further include: second transistor, in which: the grid of the second transistor receives
The source electrode of the scanning voltage signal, the source electrode of the second transistor and the driving transistor couples, second crystal
The drain electrode of pipe receives the data voltage signal.
Optionally, the switch sub-circuit further include: second transistor, in which: the grid of the second transistor receives
The transmitting signal, the source electrode of the second transistor and the luminescent device couple, the grounded drain of the second transistor.
Optionally, the compensation sub-circuit includes first capacitor, and described first capacitor one end is grounded or connects high level, separately
One end and the control sub-circuit couple.
Optionally, the control sub-circuit includes: third transistor, the 4th transistor and the 5th transistor, in which: described
The grid of the grid of third transistor and the driving transistor couples, and receives the transmitting signal, the third transistor
Source electrode connect high level, the drain electrode of the third transistor is coupled with the drain electrode of the 4th transistor and the 5th transistor；Institute
The grid for stating the 4th transistor receives the scanning voltage signal, source electrode and the 5th transistor of the 4th transistor
Grid and the coupling of the other end of the first capacitor, the drain electrode of the 4th transistor and the third transistor and the described 5th
The drain electrode of transistor couples；The grid of 5th transistor and the source electrode of the 4th transistor and the first capacitor it is another
The source electrode of one end coupling, the source electrode of the 5th transistor and the driving transistor couples, the drain electrode of the 5th transistor
Drain electrode with the third transistor and the 4th transistor couples.
Optionally, the switch sub-circuit includes: the first transistor and second transistor, in which: the first transistor
Grid receive the scanning voltage signal, the source electrode of the first transistor receives the data voltage signal, described first
The drain electrode of transistor and the source electrode of the driving transistor couple；The grid of the second transistor receives the transmitting signal,
The drain electrode of the source electrode of the second transistor and the driving transistor and the luminescent device couple, the second transistor
Grounded drain.
Optionally, the compensation sub-circuit includes first capacitor, and described first capacitor one end is grounded or connects high level, separately
One end and the control sub-circuit couple.
Optionally, the control sub-circuit includes: third transistor, the 4th transistor and the 5th transistor, in which: described
The grid of the grid of third transistor and the driving transistor couples, and receives the transmitting signal, the third transistor
Source electrode connect high level, the drain electrode of the third transistor is coupled with the drain electrode of the third transistor and the 4th transistor；Institute
The grid for stating the 4th transistor receives the scanning voltage signal, source electrode and the 5th transistor of the 4th transistor
Grid coupling, the drain electrode of the 4th transistor are coupled with the drain electrode of the 5th transistor and the 4th transistor；It is described
The source electrode of the grid of 5th transistor and the 4th transistor couples, the source electrode and the driving crystal of the 5th transistor
The source electrode of pipe couples, and the drain electrode of the 5th transistor is coupled with the drain electrode of the third transistor and the 4th transistor；It is described
The grid of transistor is driven to receive other transmitting signals in addition to the transmitting signal.
The embodiment of the invention provides the driving method of more than one any pixel circuits, the driving methods
Include: switch sub-circuit under the control of scanning voltage signal, the anode of luminescent device reset and writes data voltage
Enter to driving transistor；Sub-circuit is controlled, it is right under the scanning voltage signal, data voltage signal and transmitting signal control
Compensation sub-circuit charges；And under data voltage signal control, controls and shine described in the driving transistor driving
Device shines；Sub-circuit is compensated, under the control of the control sub-circuit, the fixed driving transistor gate electrode potential, and it is pre-
The threshold voltage for first storing the driving transistor, compensates institute when shining with the luminescent device described in the driving transistor driving
State the threshold voltage of driving transistor；The driving transistor drives the photophore under the control of the control sub-circuit
Part shines, and when the data voltage signal corresponds to write-in data of the grayscale less than the first preset threshold, works in Asian Games row
Area, when the data voltage signal, which corresponds to grayscale, is greater than the write-in data of the second preset threshold, work is in linear zone, and described the
Two preset thresholds are greater than first preset threshold.
The embodiment of the invention provides a kind of active display, the display includes: pixel described in any of the above
Circuit and luminescent device.
Compared with prior art, the technical solution of the embodiment of the present invention has the advantage that
Organic hair can be improved due to the threshold voltage of compensation sub-circuit compensation driving transistor in above-mentioned scheme
The display controllability of optical display unit, and drive transistor under the control of control sub-circuit, when the data voltage signal pair
When answering write-in data of the grayscale less than the first preset threshold, work in sub- Operational Zone, when the data voltage signal corresponds to grayscale
Greater than the second preset threshold write-in data when, work is in linear zone, then it is brilliant can to pass through driving for relatively small data voltage
Body pipe generates driving current, therefore after luminescent device is written in compensated data voltage, luminescent device is in illuminated state
Voltage driving is electric current driving in dark-state, therefore can reduce organic light emitting display grayscale and adjust difficulty, and improve organic
The uniformity of active display.
Further, since transmitting signal controls the grid of the 8th transistor and the grid of the 7th transistor, and crystal is driven
The grid of pipe receives other transmitting signals in addition to the transmitting signal, and in other words, driving transistor is believed by independent transmitting
Number control, therefore can further decrease organic light emitting display grayscale adjust difficulty, and improve organic light emitting display it is equal
Even property and display controllability.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of the pixel circuit of 4T1C in the prior art；
Fig. 2 is the block schematic illustration of one of embodiment of the present invention pixel circuit；
Fig. 3 is the structural schematic diagram of one of embodiment of the present invention pixel circuit；
Fig. 4 is the structural schematic diagram and signal timing diagram of one of embodiment of the present invention pixel circuit；
Fig. 5 is the structural schematic diagram of one of embodiment of the present invention pixel circuit；
Fig. 6 is the structural schematic diagram of one of embodiment of the present invention pixel circuit；And
Fig. 7 is the structural schematic diagram of one of embodiment of the present invention pixel circuit.
Specific embodiment
From the above mentioned, since the threshold voltage vt h or mobility [mu] of driving transistor are because of the factors shadow such as circuit aging or temperature
Sound can change at any time, or since the loss variable of capacitor is different, therefore for each pixel circuit, it flows through at present
The current strength of light-emitting component is not identical.
Fig. 1 shows a kind of pixel circuit of 4T1C in the prior art, as shown in Figure 1, S11 is corresponding to be swept during S11
Line high level is retouched, the data voltage VDATA inputted on data voltage line is in low level, transistor M14 is opened, M12 is closed,
M11 is closed and M15 is closed, and the opening of reset transistor M14 is resetted to the anode N12 node of luminescent device OLED；It is defeated during S12
Enter high level, transistor M12 is opened, and data voltage VDATA is written to N11, gives capacitor Cst charging write potential, i.e., to pixel
Circuit write-in shows voltage, and M11 generates electric current driving OLED and shines during EMIT.
It should be noted that state of the N11 node of this pixel circuit when each frame starts is different, for capacitor
For, the speed of charge and discharge is unequal, this means that at the same time, becomes to the loss of capacitor write-in DATA voltage
Amount is different, so as to cause showing that uncontrollable degree and the uniformity are low；Also, for the transistor of high mobility, one
Determine in data voltage, current-jump is violent, causes to increase grayscale adjustment difficulty.
To solve the above problems, passing through setting compensation sub-circuit compensation the embodiment of the invention provides a kind of pixel circuit
The threshold voltage of transistor is driven, therefore the display controllability of organic light emitting display can be improved, and transistor is driven to exist
Under the control for controlling sub-circuit, when the data voltage signal corresponds to write-in data of the grayscale less than the first preset threshold, work
Make in sub- Operational Zone, when the data voltage signal, which corresponds to grayscale, is greater than the write-in data of the second preset threshold, work is online
Property area, then relatively small data voltage can generate driving current by driving transistor, therefore by compensated data
Voltage is written after luminescent device, and luminescent device is voltage driving in illuminated state, is electric current driving in dark-state, therefore can drop
Low organic light emitting display grayscale adjusts difficulty, and improves the uniformity of organic light emitting display.
It is understandable to enable the above objects, features, and advantages of the embodiment of the present invention to become apparent, it is right with reference to the accompanying drawing
The specific embodiment of the embodiment of the present invention is described in detail.
Fig. 2 shows one of embodiment of the present invention pixel circuits, as shown in Fig. 2, the pixel circuit may include:
Switch sub-circuit 21, control sub-circuit 22, compensation sub-circuit 23 and driving transistor 24.
The switch sub-circuit 21, suitable for being resetted to the anode of luminescent device under the control of scanning voltage signal
And data voltage is written to the driving transistor 24.The control sub-circuit 22 is suitable in the scanning voltage signal, number
According under voltage signal and transmitting signal control, charge to the compensation sub-circuit 23；And for believing in the data voltage
Under number control, controls the driving transistor 24 and drive the luminescent device luminous.
The compensation sub-circuit 23, suitable for fixing the driving transistor 24 under the control of the control sub-circuit 22
Grid potential, and the threshold voltage of the driving transistor 24 is stored in advance, to drive the hair in the driving transistor 24
Optical device compensates the threshold voltage of the driving transistor 24 when shining.
The driving transistor 24, suitable for driving the luminescent device to shine under the control of the control sub-circuit 22,
And when the data voltage signal corresponds to write-in data of the grayscale less than the first preset threshold, works in sub- Operational Zone, work as institute
When stating data voltage signal and corresponding to grayscale and be greater than the write-in data of the second preset threshold, in linear zone, described second is default for work
Threshold value is greater than first preset threshold.
In specific implementation, the compensation sub-circuit may include first capacitor, described first capacitor one end ground connection or
High level is connect, the other end and the control sub-circuit couple.
In specific implementation, the control sub-circuit includes: third transistor, the 4th transistor and the 5th transistor.Institute
The connection relationship for stating transistor can be respectively as follows:
The grid of the grid of the third transistor and the driving transistor couples, and receives the transmitting signal, institute
The source electrode for stating third transistor connects high level, the drain electrode of the third transistor and the 4th transistor and the 5th transistor
Drain electrode coupling.
The grid of 4th transistor receives the scanning voltage signal, the source electrode of the 4th transistor and described the
The grid of five transistors and the coupling of the other end of the first capacitor, the drain electrode and the third transistor of the 4th transistor
And the drain electrode coupling of the 5th transistor.The source electrode of the grid of 5th transistor and the 4th transistor and described the
The other end of one capacitor couples, and the source electrode of the source electrode of the 5th transistor and the driving transistor couples, and the described 5th is brilliant
The drain electrode of body pipe is coupled with the drain electrode of the third transistor and the 4th transistor.
In specific implementation, the structure of the switch sub-circuit can be different.For example, the switch sub-circuit can be
Including a transistor, therefore it can simplify the structure of pixel circuit.
For ease of understanding, can a transistor be referred to as the first transistor, the grid of the first transistor receives anti-
To the scanning voltage signal, the source electrode of the first transistor and it is described driving transistor source electrode couple, described first
The drain electrode of transistor receives the data voltage signal.
For example, Fig. 3 shows the structural schematic diagram of one of embodiment of the present invention pixel circuit, as shown in figure 3, described
The switch sub-circuit of pixel circuit includes the first transistor M35, and the compensation sub-circuit includes first capacitor C32, the control
Sub-circuit includes third transistor M32, the 4th transistor M34 and the 5th transistor M31, and the driving transistor is M33, is shone
Component is D1.
To control convenient for signal, in specific implementation, in addition to above-mentioned the first transistor, the switch sub-circuit can be with
It again include second transistor, and according to the connection relationship of the first transistor and second transistor difference, the structure of pixel circuit
It can also be different.
Such as in an embodiment of the present invention, the grid of the second transistor receives the scanning voltage signal, described
The source electrode of second transistor receives the data voltage signal, the source of the drain electrode of the second transistor and the driving transistor
Pole coupling.
Fig. 4 shows the structural schematic diagram and signal timing diagram (the right) of one of embodiment of the present invention pixel circuit,
As shown in figure 4, the switch sub-circuit of the pixel circuit includes the first transistor M25 and second transistor M26, compensation
Circuit includes first capacitor C22, the one end first capacitor C22 ground connection, other end binding place N21.The control sub-circuit includes the
Three transistor M22, the 4th transistor M24 and the 5th transistor M21, the node N21 are the source electrode of the 4th transistor M24
With the crosspoint of the grid of the 5th transistor M21, driving transistor is M23, luminous component D1.Below with reference to Fig. 4 to this hair
The working principle of pixel circuit in bright embodiment describes in detail:
During t1 stage namely SCAN, scan control signal SCAN is low level, reversed scan control signal
SCAN！For high level, the first transistor M25, second transistor M26 and the 4th transistor M24 are opened, input voltage signal DATA
Low potential be written node N23, realize OLED anode reset.
During t2, third transistor M22 and driving transistor M23 are closed, the 5th transistor M21, the 4th transistor
M24, the first transistor M25 and second transistor M26 are opened, and node N21, node N22 and knot is written in input voltage signal DATA
Point N23, first capacitor C22 charging, and the voltage at node N21 includes the threshold voltage (N21=of the 5th transistor M21 pipe
The threshold voltage of DATA+M21), therefore threshold compensation can be carried out to the 5th transistor M21.
During t3, third transistor M21, the 5th transistor M22 and driving transistor M23 are opened, positive v+ and negative
Pole v- is applied to the drain terminal of driving transistor M23 and the cathode of luminous component D1 respectively, therefore luminous component D1 can be driven to send out
Light.Also, driving the parameter setting of transistor M23 has improvement, it is ensured that carries out paragraph by paragraph luminous component D1 to voltage.
Specifically, the input voltage signal DATA for low ash rank is written, driving transistor M23 work is in Asian Games row
Area, driving transistor M23 provide low current to luminous component D1, namely luminous component D1 at this time is driven by electric current.And when height
When the DATA write-in of grayscale, in linear zone, luminous component D1 at this time is driven by voltage for driving transistor M23 work.It therefore can
Difficulty is adjusted to reduce organic light emitting display grayscale, and improves the uniformity of organic light emitting display.
In an alternative embodiment of the invention, the grid of the second transistor receives the scanning voltage signal, and described the
The source electrode of the source electrode of two-transistor and the driving transistor couples, and the drain electrode of the second transistor receives the data voltage
Signal.
Fig. 5 shows the structural schematic diagram of one of embodiment of the present invention pixel circuit, as shown in figure 5, the pixel
The switch sub-circuit of circuit includes the first transistor M55 and second transistor M56, and the compensation sub-circuit includes first capacitor
C52, first capacitor C52 mono- terminate positive V+, other end binding place N51.The control sub-circuit include third transistor M52,
4th transistor M54 and the 5th transistor M51, the node N51 are the source electrode and the 5th transistor of the 4th transistor M54
The crosspoint of the grid of M51, driving transistor are M53, luminous component D1.
In an alternative embodiment of the invention, the grid of the second transistor receives the transmitting signal, and described second is brilliant
The source electrode of body pipe and the luminescent device couple, the grounded drain of the second transistor.
Fig. 6 shows the structural schematic diagram of one of embodiment of the present invention pixel circuit, as shown in fig. 6, the pixel
The switch sub-circuit of circuit includes the first transistor M46 and second transistor M45, and the compensation sub-circuit includes first capacitor
C52, the one end first capacitor C52 are grounded GND, other end binding place N41.The control sub-circuit includes third transistor M42,
Four transistor M44 and the 5th transistor M41, the node N41 are the source electrode and the 5th transistor of the 4th transistor M44
The crosspoint of the grid of M41, driving transistor are M43, luminous component D1.
In specific implementation, the switch sub-circuit can also directly include 2 transistors, respectively the first transistor with
Second transistor.The grid of the first transistor receives the scanning voltage signal, and the source electrode of the first transistor receives
The data voltage signal, the drain electrode of the first transistor and the source electrode of the driving transistor couple；Second crystal
The grid of pipe receives the transmitting signal, the drain electrode of the source electrode of the second transistor and the driving transistor and described shines
Device coupling, the grounded drain of the second transistor.
The compensation sub-circuit includes first capacitor, described first capacitor one end ground connection or connects high level, the other end with
The control sub-circuit coupling.
The control sub-circuit includes: that third transistor, the 4th transistor and the 5th transistor, connection relationship are corresponding
Are as follows: the grid of the grid of the third transistor and the driving transistor couples, and receives the transmitting signal, the third
The source electrode of transistor connects high level, the drain electrode of the third transistor and the drain electrode coupling of the third transistor and the 4th transistor
It connects.The grid of 4th transistor receives the scanning voltage signal, the source electrode of the 4th transistor and the 5th crystalline substance
The grid of body pipe couples, the drain electrode of the 4th transistor and the drain electrode coupling of the 5th transistor and the 4th transistor
It connects.
The source electrode of the grid of 5th transistor and the 4th transistor couples, the source electrode of the 5th transistor with
The source electrode coupling of the driving transistor, the drain electrode and the leakage of the third transistor and the 4th transistor of the 5th transistor
Pole coupling.The grid of the driving transistor receives other transmitting signals in addition to the transmitting signal.
Fig. 7 shows the structural schematic diagram of one of embodiment of the present invention pixel circuit, as shown in fig. 7, the pixel
The switch sub-circuit of circuit includes the first transistor M66 and second transistor M65, and the compensation sub-circuit includes first capacitor
C62, the one end first capacitor C62 are grounded GND, other end binding place N61.The control sub-circuit includes third transistor M62,
Four transistor M64 and the 5th transistor M61, the node N61 are the source electrode and the 5th transistor of the 4th transistor M64
The crosspoint of the grid of M61, driving transistor are M63, and the grid of M63 receives other transmittings in addition to the transmitting signal EMIT
Signal EMIT1, luminous component D1.
It should be noted that the signal timing diagram of Fig. 4-Fig. 7 is all the same, in as Fig. 4 shown in the right, circuit is corresponding
Workflow can be with specific reference to the corresponding description in Fig. 4, and this is no longer going to repeat them.
It is described the embodiment of the invention also provides the driving method of pixel circuit described in more than one any embodiments
Method may include: switch sub-circuit under the control of scanning voltage signal, reset and will count to the anode of luminescent device
It is written according to voltage to driving transistor；Sub-circuit is controlled, in the scanning voltage signal, data voltage signal and transmitting signal control
Under system, charge to compensation sub-circuit；And under data voltage signal control, driving transistor driving institute is controlled
Luminescent device is stated to shine.
Sub-circuit is compensated, under the control of the control sub-circuit, the fixed driving transistor gate electrode potential, and in advance
The threshold voltage for storing the driving transistor, when being shone with the luminescent device described in the driving transistor driving described in compensation
Drive the threshold voltage of transistor；The driving transistor drives the luminescent device under the control of the control sub-circuit
It shines, and when the data voltage signal corresponds to write-in data of the grayscale less than the first preset threshold, works in sub- Operational Zone,
When the data voltage signal, which corresponds to grayscale, is greater than the write-in data of the second preset threshold, work is in linear zone, and described second
Preset threshold is greater than first preset threshold.
The embodiment of the invention also provides a kind of active display, the active display may include that any of the above is implemented
Pixel circuit and luminescent device described in example.
Although present disclosure is as above, present invention is not limited to this.Anyone skilled in the art are not departing from this
It in the spirit and scope of invention, can make various changes or modifications, therefore protection scope of the present invention should be with claim institute
Subject to the range of restriction.
Claims (12)
1. a kind of pixel circuit characterized by comprising switch sub-circuit, control sub-circuit, compensation sub-circuit and driving crystal
Pipe, in which:
The switch sub-circuit, suitable for reset and will count to the anode of luminescent device under the control of scanning voltage signal
It is written according to voltage to the driving transistor；
The control sub-circuit is suitable under the scanning voltage signal, data voltage signal and transmitting signal control, to described
Compensation sub-circuit charges；And for controlling described in the driving transistor driving under data voltage signal control
Luminescent device shines；
The compensation sub-circuit, suitable for fixing the driving transistor gate electrode potential under the control of the control sub-circuit, and
The threshold voltage of the driving transistor is stored in advance, is compensated when being shone with the luminescent device described in the driving transistor driving
The threshold voltage of the driving transistor；
The driving transistor, suitable for driving the luminescent device to shine, and when described under the control of the control sub-circuit
When data voltage signal corresponds to write-in data of the grayscale less than the first preset threshold, work is in sub- Operational Zone, when the data electricity
When pressure signal corresponds to write-in data of the grayscale greater than the second preset threshold, work in linear zone, second preset threshold is greater than
First preset threshold.
2. pixel circuit as described in claim 1, which is characterized in that the switch sub-circuit, comprising: the first transistor, institute
The grid for stating the first transistor receives the reversed scanning voltage signal, and the source electrode of the first transistor and the driving are brilliant
The source electrode of body pipe couples, and the drain electrode of the first transistor receives the data voltage signal.
3. pixel circuit as claimed in claim 2, which is characterized in that the switch sub-circuit further include: second transistor,
In:
The grid of the second transistor receives the scanning voltage signal, and the source electrode of the second transistor receives the data
Voltage signal, the drain electrode of the second transistor and the source electrode of the driving transistor couple.
4. pixel circuit as claimed in claim 2, which is characterized in that the switch sub-circuit further include: second transistor,
In:
The grid of the second transistor receives the scanning voltage signal, and the source electrode of the second transistor and the driving are brilliant
The source electrode of body pipe couples, and the drain electrode of the second transistor receives the data voltage signal.
5. pixel circuit as claimed in claim 2, which is characterized in that the switch sub-circuit further include: second transistor,
In:
The grid of the second transistor receives the transmitting signal, the source electrode of the second transistor and the luminescent device coupling
It connects, the grounded drain of the second transistor.
6. pixel circuit as claimed in claim 5, which is characterized in that the compensation sub-circuit includes first capacitor, and described
One capacitor one end is grounded or connects high level, and the other end and the control sub-circuit couple.
7. pixel circuit as claimed in claim 6, which is characterized in that the control sub-circuit includes: third transistor, the 4th
Transistor and the 5th transistor, in which:
The grid of the grid of the third transistor and the driving transistor couples, and receives the transmitting signal, and described the
The source electrode of three transistors connects high level, the drain electrode and the drain electrode of the 4th transistor and the 5th transistor of the third transistor
Coupling；
The grid of 4th transistor receives the scanning voltage signal, the source electrode of the 4th transistor and the 5th crystalline substance
The grid of body pipe and the coupling of the other end of the first capacitor, the drain electrode of the 4th transistor and the third transistor and institute
State the drain electrode coupling of the 5th transistor；
The grid of 5th transistor and the source electrode of the 4th transistor and the other end of the first capacitor couple, described
The source electrode of the source electrode of 5th transistor and the driving transistor couples, the drain electrode of the 5th transistor and the third crystal
The drain electrode coupling of pipe and the 4th transistor.
8. pixel circuit as described in claim 1, which is characterized in that the switch sub-circuit includes: the first transistor and
Two-transistor, in which:
The grid of the first transistor receives the scanning voltage signal, and the source electrode of the first transistor receives the data
Voltage signal, the drain electrode of the first transistor and the source electrode of the driving transistor couple；
The grid of the second transistor receives the transmitting signal, the source electrode of the second transistor and the driving transistor
Drain electrode and the luminescent device coupling, the grounded drain of the second transistor.
9. pixel circuit as claimed in claim 8, which is characterized in that the compensation sub-circuit includes first capacitor, and described
One capacitor one end is grounded or connects high level, and the other end and the control sub-circuit couple.
10. pixel circuit as claimed in claim 9, which is characterized in that the control sub-circuit includes: third transistor,
Four transistors and the 5th transistor, in which:
The grid of the grid of the third transistor and the driving transistor couples, and receives the transmitting signal, and described the
The source electrode of three transistors connects high level, the drain electrode and the drain electrode of the third transistor and the 4th transistor of the third transistor
Coupling；
The grid of 4th transistor receives the scanning voltage signal, the source electrode of the 4th transistor and the 5th crystalline substance
The grid of body pipe couples, the drain electrode of the 4th transistor and the drain electrode coupling of the 5th transistor and the 4th transistor
It connects；
The source electrode of the grid of 5th transistor and the 4th transistor couples, the source electrode of the 5th transistor with it is described
Drive the source electrode coupling of transistor, the drain electrode of the 5th transistor and the drain electrode coupling of the third transistor and the 4th transistor
It connects；
The grid of the driving transistor receives other transmitting signals in addition to the transmitting signal.
11. the driving method of pixel circuit described in a kind of any one of claim 1-10 characterized by comprising
Sub-circuit is switched under the control of scanning voltage signal, the anode of luminescent device reset and data voltage is written
To driving transistor；
Control sub-circuit, the scanning voltage signal, data voltage signal and transmitting signal control under, to compensation sub-circuit into
Row charging；And under data voltage signal control, controls luminescent device described in the driving transistor driving and shine；
Sub-circuit is compensated, under the control of the control sub-circuit, the fixed driving transistor gate electrode potential, and be stored in advance
The threshold voltage of the driving transistor, compensates the driving when shining with the luminescent device described in the driving transistor driving
The threshold voltage of transistor；
The driving transistor drives the luminescent device to shine, and work as the data under the control of the control sub-circuit
When voltage signal corresponds to write-in data of the grayscale less than the first preset threshold, work is in sub- Operational Zone, when the data voltage is believed
When number corresponding grayscale is greater than the write-in data of the second preset threshold, work is greater than described in linear zone, second preset threshold
First preset threshold.
12. a kind of active display characterized by comprising pixel circuit described in any one of claim 1-10 and
Luminescent device.
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| CN201810180884.1A CN110232893A (en) | 2018-03-05 | 2018-03-05 | A kind of active display, driving method and its pixel circuit |
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| CN201810180884.1A CN110232893A (en) | 2018-03-05 | 2018-03-05 | A kind of active display, driving method and its pixel circuit |
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