CN109215585A - Pixel circuit and its driving method and display device - Google Patents
Pixel circuit and its driving method and display device Download PDFInfo
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- CN109215585A CN109215585A CN201811415519.0A CN201811415519A CN109215585A CN 109215585 A CN109215585 A CN 109215585A CN 201811415519 A CN201811415519 A CN 201811415519A CN 109215585 A CN109215585 A CN 109215585A
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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]
- G09G3/3275—Details of drivers for data electrodes
- G09G3/3291—Details of drivers for data electrodes in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements
-
- 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
Abstract
The present invention provides a kind of pixel circuit and its driving method and display device.The pixel circuit, including light-emitting component, the pixel circuit further includes driving circuit and initializing circuit, and the control terminal of the driving circuit is connect with control node, the first end of the driving circuit is connect with first voltage end, and the second end of the driving circuit is connect with the light-emitting component；The initializing circuit is connect with the first reset terminal, the second end of the driving circuit and initial voltage line respectively, for under the control for the first reset signal that first reset terminal inputs, the second end of the driving circuit to be written in the initial voltage on the initial voltage line by control.The present invention solves to lead to the presence of display bright spot due to transistor leakage in light emitting phase in the prior art, so that visual bad problem occurs in display product.
Description
Technical field
The present invention relates to field of display technology more particularly to a kind of pixel circuit and its driving method and display devices.
Background technique
In existing AMOLED, (Active-matrix organic light-emitting diode, active matrix have
Machine light emitting diode) it shows in product, the bright spot caused by being leaked electricity TFT (thin film transistor (TFT)) is very more, wherein pixel electricity
The drain-source voltage of initialization transistor in road is larger, it is easier to cause to leak electricity, to generate bright spot in display, cause to show
Product appearance is visual bad, to influence product yield.
Summary of the invention
The main purpose of the present invention is to provide a kind of pixel circuit and its driving method and display devices, solve existing skill
Lead to the presence of display bright spot in art due to transistor leakage in light emitting phase, so that display product appearance is visual bad
The problem of.
In order to achieve the above object, the present invention provides a kind of pixel circuits, including light-emitting component, and the pixel circuit is also
Including driving circuit and initializing circuit, the control terminal of the driving circuit is connect with control node, and the of the driving circuit
One end is connect with first voltage end, and the second end of the driving circuit is connect with the light-emitting component；
The initializing circuit is connect with the first reset terminal, the second end of the driving circuit and initial voltage line respectively,
For controlling the initial electricity on the initial voltage line under the control for the first reset signal that first reset terminal inputs
The second end of the driving circuit is written in pressure.
When implementation, the initializing circuit includes initialization transistor；
The control electrode of the initialization transistor is connect with first reset terminal, the first pole of the initialization transistor
It is connect with the second end of the driving circuit, the second pole of the initialization transistor is connect with initial voltage line.
When implementation, the driving circuit includes driving transistor；
The control terminal of the extremely described driving circuit of control of the driving transistor, the first of the driving transistor is extremely
The first end of the driving circuit, the second end of the second extremely described driving circuit of the driving transistor.
When implementation, pixel circuit of the present invention further include accumulator, compensation control circuit, data write circuit and
Emission control circuit, wherein
The first end of the accumulator is connect with the first voltage end, the second end of the accumulator and the drive
The control terminal connection of dynamic circuit, the current potential of the control terminal for controlling the driving circuit；
The compensation control circuit second end with grid line, the control terminal of the driving circuit and the driving circuit respectively
Connection, for controlling the control for the driving circuit that is turned on or off under the control for the gate drive signal that the grid line inputs
Connection between end processed and the second end of the driving circuit；
The data write circuit is connect with the first end of the second reset terminal, data line and the driving circuit respectively, is used
Under the control of the second reset signal inputted in second reset terminal, control will be described in the data voltage write-in on data line
The first end of driving circuit；
The emission control circuit respectively with light emitting control line, the first voltage end, the driving circuit first end,
The second end of the driving circuit is connected with the light-emitting component, the LED control signal for inputting in the light emitting control line
Control under, the connection between the first end for the driving circuit that is turned on or off and the first voltage end, and lead on-off
Open the connection between the second end of the driving circuit and the light-emitting component.
When implementation, the accumulator includes storage capacitance；
The first end of the storage capacitance is connect with the first voltage end, the second end of the storage capacitance and the drive
The control terminal connection of dynamic circuit；
The compensation control circuit includes compensation control transistor；
It is described compensation control transistor control electrode connect with the grid line, it is described compensation control transistor the first pole and
The control terminal of the driving circuit connects, and the second pole of the compensation control transistor and the second end of the driving circuit connect
It connects.
When implementation, the data write circuit includes data writing transistor；
The control electrode of the data writing transistor is connect with second reset terminal, and the of the data writing transistor
One pole is connect with the first end of the driving circuit, and the second pole of the data writing transistor is connect with the data line；
The emission control circuit includes the first light emitting control transistor and the second light emitting control transistor；
The control electrode of the first light emitting control transistor is connect with the light emitting control line, and first light emitting control is brilliant
First pole of body pipe is connect with the first voltage end, the second pole of the first light emitting control transistor and the driving circuit
First end connection；
The control electrode of the second light emitting control transistor is connect with the light emitting control line, and second light emitting control is brilliant
First pole of body pipe is connect with the second end of the driving circuit, the second pole of the second light emitting control transistor and the hair
Optical element connection.
When implementation, pixel circuit of the present invention further includes reset circuit, respectively with grid line, the light-emitting component
One pole is connected with initial voltage line, for controlling the luminous member under the control for the gate drive signal that the grid line inputs
It is connected between first pole of part and the initial voltage line；
Second pole of the light-emitting component is connect with second voltage end.
When implementation, the reset circuit includes reset transistor；
The control electrode of the reset transistor is connect with the grid line, and the first pole of the reset transistor shines with described
First pole of element connects, and the second pole of the reset transistor is connect with the initial voltage line.
The present invention also provides a kind of driving methods of pixel circuit, for driving above-mentioned pixel circuit, the pixel
The driving method of circuit includes:
In initial phase, for initializing circuit under the control for the first reset signal that the first reset terminal inputs, control will
The second end of initial voltage write driver circuit on initial voltage line.
When implementation, the pixel circuit includes accumulator, compensation control circuit, data write circuit and light emitting control electricity
Road is additionally provided with data write phase and light emitting phase, the driving method of the pixel circuit after the initial phase
Further include:
In the initial phase and the data write phase, the compensation control circuit drives in the grid that grid line inputs
Under the control of dynamic signal, controls and be connected between the control terminal of driving circuit and the second end of the driving circuit；
In the control for the second reset signal that the data write phase, the data write circuit are inputted in the second reset terminal
Under system, the data voltage on data line is written to the first end of the driving circuit, the driving circuit control its first end with
It is connected between the second end of the driving circuit, to be charged by the data voltage to the accumulator, until the drive
Dynamic circuit disconnects the connection between its first end and the second end of the driving circuit；
In the control for the LED control signal that the light emitting phase, the emission control circuit are inputted in light emitting control line
Under, control and be connected between the first end of the driving circuit and first voltage end, and control the second end of the driving circuit with
It is connected between the light-emitting component, the driving circuit drives the light-emitting component to shine.
The present invention also provides a kind of display devices, including above-mentioned pixel circuit.
Compared with prior art, pixel circuit and its driving method of the present invention and display device are using initialization electricity
Road, initializing circuit is under the control of the first reset signal, by the second end of initial voltage write driver circuit, thus shining
Stage will not reduce the control terminal of driving circuit even if the initialization transistor that the initializing circuit includes generates electric leakage
Current potential and can only make so that the driving current of driving circuit driving light-emitting component will not be made to increase and generate bright spot
The brightness of light-emitting component described in light emitting phase is relatively low, generates dim spot, since the relatively dim spot on display panel is difficult to be found,
It is bad that the visuality that display product occurs can be improved, promote display product yield.
Detailed description of the invention
Fig. 1 is the structure chart of pixel circuit described in the embodiment of the present invention；
Fig. 2 is the structure chart of pixel circuit described in another embodiment of the present invention；
Fig. 3 is the structure chart of pixel circuit described in further embodiment of this invention；
Fig. 4 is the structure chart of pixel circuit described in yet another embodiment of the invention；
Fig. 5 is the circuit diagram of a specific embodiment of pixel circuit of the present invention；
Fig. 6 is the working timing figure of the specific embodiment of pixel circuit of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The transistor used in all embodiments of the invention all can be triode, thin film transistor (TFT) or field-effect tube or its
The identical device of his characteristic.In embodiments of the present invention, to distinguish the two poles of the earth of transistor in addition to control electrode, will wherein claim a pole
For the first pole, another pole is known as the second pole.
In practical operation, when the transistor is triode, the control electrode can be base stage, and first pole can
Think collector, second pole can be with emitter；Alternatively, the control electrode can be base stage, described first can be extremely hair
Emitter-base bandgap grading, second pole can be with collector.
In practical operation, when the transistor is thin film transistor (TFT) or field-effect tube, the control electrode can be grid
Pole, described first can be extremely drain electrode, and described second extremely can be source electrode；Alternatively, the control electrode can be grid, described the
One extremely can be source electrode, and described second can be extremely drain electrode.
As shown in Figure 1, pixel circuit described in the embodiment of the present invention, including light-emitting element E L, the pixel circuit also wrap
Driving circuit 11 and initializing circuit 12 are included, the control terminal of the driving circuit 11 is connect with control node N1, the driving electricity
The first end on road 11 is connect with first voltage end VT1, and the second end of the driving circuit 11 is connect with the light-emitting element E L；
The initializing circuit 12 respectively with the first reset terminal Reset, the second end of the driving circuit 11 and initial electricity
Crimping connection, for controlling the initial electricity under the control for the first reset signal that the first reset terminal Reset is inputted
The second end of the driving circuit 11 is written in initial voltage Vinit on crimping.
In pixel circuit described in the embodiment of the present invention, initializing circuit 12, will under the control of the first reset signal
The second end of initial voltage Vinit write driver circuit 11, thus in light emitting phase, even if the initializing circuit 12 includes
Initialization transistor generates electric leakage, the current potential of the control terminal of driving circuit 11 will not be reduced, to will not make driving circuit
The driving current of 11 driving light-emitting element E L increases and generates bright spot, and can only make the light-emitting element E L described in light emitting phase
Brightness is relatively low, generates dim spot, since the relatively dim spot on display panel is difficult to be found, can improve what display product occurred
It is visual bad, promote display product yield.
In practical operation, the first voltage end VT1 can be high voltage end, and but not limited to this；The luminous member
Part EL can be Organic Light Emitting Diode, and but not limited to this.
In embodiments of the present invention, when the driving transistor that the driving circuit 11 includes is p-type transistor, Vinit
It can be negative voltage, be opened so that driving transistor can be controlled when data write phase starts, but not limited to this；
When the driving transistor that the driving circuit 11 includes is n-type transistor, Vinit can be positive voltage, with energy
Enough control driving transistors when data write phase starts are opened, and but not limited to this；
The embodiment of the present invention by drive transistor be p-type transistor for be illustrated.
In the specific implementation, the initializing circuit may include initialization transistor；
The control electrode of the initialization transistor is connect with first reset terminal, the first pole of the initialization transistor
It is connect with the second end of the driving circuit, the second pole of the initialization transistor is connect with initial voltage line.
As shown in Fig. 2, the initializing circuit 12 includes just on the basis of the embodiment of pixel circuit shown in Fig. 1
Beginningization transistor T1；
The grid of the initialization transistor T1 is connect with the first reset terminal Reset, the leakage of the initialization transistor T1
Pole is connect with the second end of the driving circuit 11, and the source electrode of the initialization transistor T1 accesses initial voltage Vinit；
In the embodiment shown in Figure 2, T4 is p-type TFT (thin film transistor (TFT)), and but not limited to this.
At work, in initial phase, Reset inputs low electricity to the embodiment of present invention pixel circuit as shown in Figure 2
Flat, T4 is opened, to control the second end that the driving circuit 11 is written in Vinit.
Specifically, the driving circuit may include driving transistor；
The control terminal of the extremely described driving circuit of control of the driving transistor, the first of the driving transistor is extremely
The first end of the driving circuit, the second end of the second extremely described driving circuit of the driving transistor.
As shown in figure 3, on the basis of the embodiment of present invention pixel circuit shown in FIG. 1, described in the embodiment of the present invention
Pixel circuit can also include accumulator 13, compensation control circuit 14, data write circuit 15 and emission control circuit 16,
Wherein,
The first end of the accumulator 13 is connect with the first voltage end VT1, the second end of the accumulator 11
It is connect with the control terminal of the driving circuit 11, the current potential of the control terminal for controlling the driving circuit 11；
The compensation control circuit 14 respectively with grid line Gate, the control terminal of the driving circuit 11 and the driving circuit
11 second end connection, for controlling the institute that is turned on or off under the control for the gate drive signal that the grid line Gate is inputted
State the connection between the control terminal of driving circuit 11 and the second end of the driving circuit 11；
The data write circuit 15 respectively with the second reset terminal Reset1, data line Data and the driving circuit 11
First end connection, for controlling the data voltage on data line Data under the control of the second reset terminal Reset2
The first end of the driving circuit 11 is written in Vdata；
The emission control circuit 16 respectively with light emitting control line EM, the first voltage end VT1, the driving circuit 11
First end, the second end of the driving circuit 11 connected with the light-emitting element E L, in the light emitting control line EM it is defeated
Under the control of the LED control signal entered, the first end for the driving circuit 11 that is turned on or off and the first voltage end VT1
Between connection, and the connection between the second end and the light-emitting element E L of the driving circuit 11 that is turned on or off.
In the embodiment of present invention pixel circuit as described in Figure 3, the first end of driving circuit 11 is shone by described
Control circuit 16 is connect with the first voltage end VT1, and is not the first end of the driving circuit 11 directly with described the
One voltage end VT1 connection.
In the embodiment of present invention pixel circuit as described in Figure 3, the second end of driving circuit 11 is shone by described
Control circuit 16 is connect with the light-emitting element E L, and not be the driving circuit 11 second end directly with the luminous member
Part EL connection.
The embodiment of present invention pixel circuit as described in Figure 3 at work, the display cycle include set gradually it is initial
Change stage, data write phase and light emitting phase；
In initial phase, initializing circuit 12 under the control of the first reset terminal Reset the first reset signal inputted,
It controls the second end of the initial voltage Vinit write driver circuit 11 on initial voltage line；The compensation control circuit 14 exists
Under the control of the gate drive signal of grid line Gate input, control driving circuit 11 control terminal and the driving circuit 11 the
It is connected between two ends, so that the current potential of the control terminal of the driving circuit 11 is the initial voltage Vinit；
In the second reset that the data write phase, the data write circuit 15 are inputted in the second reset terminal Reset1
Under the control of signal, the first end of the driving circuit 11 is written in the data voltage Vdata on data line Data by control, described
Compensation control circuit 14 controls the control terminal of driving circuit 11 under the control of the grid line Gate gate drive signal inputted
It is connected between the second end of the driving circuit 11, the driving circuit 11 controls its first end and the driving circuit 11
It is connected between second end, to be charged by the data voltage Vdata to the accumulator 13, until the driving circuit 11
Disconnect the connection between its first end and the second end of the driving circuit 11；
In the light emitting phase, control of the emission control circuit 16 in the light emitting control line EM LED control signal inputted
It under system, controls and is connected between the first end of the driving circuit 11 and first voltage end VT1, and control the driving circuit 11
It is connected between second end and the light-emitting element E L, the driving circuit 11 drives the light-emitting element E L to shine.
Specifically, the accumulator may include storage capacitance；
The first end of the storage capacitance is connect with the first voltage end, the second end of the storage capacitance and the drive
The control terminal connection of dynamic circuit；
The compensation control circuit includes compensation control transistor；
It is described compensation control transistor control electrode connect with the grid line, it is described compensation control transistor the first pole and
The control terminal of the driving circuit connects, and the second pole of the compensation control transistor and the second end of the driving circuit connect
It connects.
Specifically, the data write circuit may include data writing transistor；
The control electrode of the data writing transistor is connect with second reset terminal, and the of the data writing transistor
One pole is connect with the first end of the driving circuit, and the second pole of the data writing transistor is connect with the data line；
The emission control circuit includes the first light emitting control transistor and the second light emitting control transistor；
The control electrode of the first light emitting control transistor is connect with the light emitting control line, and first light emitting control is brilliant
First pole of body pipe is connect with the first voltage end, the second pole of the first light emitting control transistor and the driving circuit
First end connection；
The control electrode of the second light emitting control transistor is connect with the light emitting control line, and second light emitting control is brilliant
First pole of body pipe is connect with the second end of the driving circuit, the second pole of the second light emitting control transistor and the hair
Optical element connection.
In the specific implementation, pixel circuit of the present invention can also include reset circuit, respectively with grid line, the hair
First pole of optical element is connected with initial voltage line, for controlling under the control for the gate drive signal that the grid line inputs
It is connected between first pole of the light-emitting component and the initial voltage line；
Second pole of the light-emitting component is connect with second voltage end.
Pixel circuit described in the embodiment of the present invention uses reset circuit, under the control of gate drive signal, so that
Initial voltage Vinit is accessed in first pole of initial phase and data write phase, the light-emitting component, to control described shine
Element EL does not shine, so as to avoid the charge for the first pole for remaining on the light-emitting component to normally showing in this display cycle
Influence.
In the specific implementation, the second voltage end can be low-voltage end, and but not limited to this.
As shown in figure 4, on the basis of the embodiment of pixel circuit shown in Fig. 3, pixel described in the embodiment of the present invention
Circuit can also include reset circuit 17；The light-emitting component is Organic Light Emitting Diode OLED；
The reset circuit 17 is respectively with grid line Gate, the anode of the Organic Light Emitting Diode OLED and for inputting just
The initial voltage line of beginning voltage Vinit connects, for controlling under the control for the gate drive signal that the grid line Gate is inputted
The anode of the Organic Light Emitting Diode OLED accesses initial voltage Vinit；
The cathode of the Organic Light Emitting Diode OLED accesses low-voltage VSS；
The embodiment of present invention pixel circuit as shown in Figure 4 at work, in initial phase and data write phase,
Under the control of gate drive signal, reset circuit 17 controls the anode of Vinit write-in OLED, and Vinit is negative voltage, Vinit
Voltage difference between VSS is less than the forward conduction voltage of OLED, so that OLED does not shine.
Specifically, the reset circuit may include reset transistor；
The control electrode of the reset transistor is connect with the grid line, and the first pole of the reset transistor shines with described
First pole of element connects, and the second pole of the reset transistor is connect with the initial voltage line.
Illustrate pixel circuit of the present invention below by a specific embodiment.
As shown in figure 5, a specific embodiment of pixel circuit of the present invention includes Organic Light Emitting Diode OLED, drives
Dynamic circuit, initializing circuit, accumulator, compensation control circuit, data write circuit 15, emission control circuit and reset electricity
Road, wherein
The driving circuit includes driving transistor T3, and the initializing circuit includes initialization transistor T1, the storage
Energy circuit includes storage capacitance C；The compensation control circuit includes compensation control transistor T2；The data write circuit includes
Data writing transistor T4；The emission control circuit includes the first light emitting control transistor T5 and the second light emitting control transistor
T6；The reset circuit includes reset transistor T7；
The first end of the storage capacitance C is connect with the high voltage end of high input voltage VDD；
The grid of the driving transistor T3 is connect with the second end of the storage capacitance C, the driving transistor T3's
Source electrode is connect with the drain electrode of the first light emitting control transistor T5, and the drain electrode of the driving transistor T3 shines with described second
Control the source electrode connection of transistor T6；
The grid of the initialization transistor T1 is connect with the first reset terminal Reset, the leakage of the initialization transistor T1
Pole is connect with the drain electrode of the driving transistor T3, and the source electrode of the initialization transistor T1 accesses initial voltage Vinit；
The grid of the compensation control transistor T2 is connect with the grid line Gate, the source of the compensation control transistor T2
Pole is connect with the grid of the driving transistor T3, and the drain electrode of the compensation control transistor T2 is with the driving transistor T3's
Drain electrode connection；
The grid of the data writing transistor T4 is connect with the second reset terminal Reset1, and crystal is written in the data
The source electrode of pipe T4 is connect with the source electrode of the driving transistor T3, the drain electrode of the data writing transistor T4 and the data line
Data connection；
The grid of the first light emitting control transistor T5 is connect with the light emitting control line EM, first light emitting control
The source electrode of transistor T5 is connect with the high voltage end of high input voltage VDD, the drain electrode of the first light emitting control transistor T5 with
The source electrode connection of the driving transistor T3；
The grid of the second light emitting control transistor T6 is connect with the light emitting control line EM, second light emitting control
The source electrode of transistor T6 is connect with the drain electrode of the driving transistor T3, the drain electrode of the second light emitting control transistor T6 and institute
State the anode connection of Organic Light Emitting Diode OLED；
The grid of the reset transistor T7 is connect with the grid line Gate, the source electrode of the reset transistor T7 with it is described
The anode of Organic Light Emitting Diode OLED connects, and draining for the reset transistor T7 is initial with input initial voltage Vinit
Pressure-wire connection；
The cathode of the Organic Light Emitting Diode OLED accesses low-voltage VSS.
In the specific embodiment of pixel circuit shown in Fig. 5, all transistors are all p-type TFT, but not as
Limit.
In the specific embodiment of pixel circuit shown in Fig. 5, Vinit is -3V, and VDD 4.6V, VSS are -2.4V, but
It is not limited.
As shown in fig. 6, the specific embodiment of present invention pixel circuit as shown in Figure 5 is at work, the display cycle includes
Initial phase S1, data write phase S2 and the light emitting phase S3 set gradually；
In initial phase S1, Reset input low level, Reset1 input high level, Gate input low level, EM input
High level, T4, T5 and T6 are turned off, and T1 and T2 are opened, and the grid of T3 is written in Vinit；T7 is opened, and the sun of OLED is written in Vinit
Pole, so that potential difference between the anode of OLED and the cathode of OLED is less than the forward conduction voltage of OLED, OLED at this time
It does not shine；
In data write phase S2, Reset input high level, Reset1 input low level, Gate input low level, EM is defeated
Entering high level, T5 and T6 are turned off, and T1, T2 and T4 are opened, when the data write phase S2 starts, the current potential of the grid of T3
For Vinit, T3 opening, Vdata is charged by T4, T3 and the T2 opened to C, until the current potential of the grid of T3 is charged to Vdata+
Vth, T3 shutdown, wherein Vth is the threshold voltage of T3；T7 is opened, and the anode of OLED is written in Vinit, so that the anode of OLED
Potential difference between the cathode of OLED is less than the forward conduction voltage of OLED, and OLED does not shine at this time；
In light emitting phase S3, Reset input high level, Reset1 input high level, Gate input high level, EM inputs low
Level, T3, T5 and T6 are opened, and T2, T1, T4 and T7 are turned off, and T3 drives OLED to shine；In embodiments of the present invention, due to
T1 is connect with the drain electrode of driving transistor T1, therefore even if generating electric leakage since the drain-source voltage Vds of T1 is bigger, also only can
It so that the voltage of the drain electrode of T3 reduces, and will not influence the current potential of the grid of T3, the driving current of T3 will not be made to become larger, and
Only since the current potential of the anode of OLED reduces brightness can be reduced, (brightness is relatively low, relative to bright to only will appear grey point
It is difficult to find for point, improves display effect).
The driving method of pixel circuit described in the embodiment of the present invention is for driving above-mentioned pixel circuit, the pixel electricity
The driving method on road includes:
In initial phase, for initializing circuit under the control for the first reset signal that the first reset terminal inputs, control will
The second end of initial voltage write driver circuit on initial voltage line.
In the driving method of pixel circuit described in the embodiment of the present invention, control of the initializing circuit in the first reset signal
Under system, by the second end of initial voltage write driver circuit, thus in light emitting phase, though the initializing circuit include just
Beginningization transistor generates electric leakage, the current potential of the control terminal of driving circuit will not be reduced, to driving circuit will not be made to drive
The driving current of light-emitting component increases and generates bright spot, and only the brightness of the light-emitting component described in light emitting phase can be made relatively low,
Dim spot is generated, since the relatively dim spot on display panel is difficult to be found, the visuality of display product appearance can be improved not
It is good, promote display product yield.
Specifically, the pixel circuit may include accumulator, compensation control circuit, data write circuit and the control that shines
Circuit processed is additionally provided with data write phase and light emitting phase, the driving of the pixel circuit after the initial phase
Method further include:
In the initial phase, the compensation control circuit is under the control for the gate drive signal that grid line inputs, control
It is connected between the control terminal of driving circuit processed and the second end of the driving circuit, so that the control terminal of the driving circuit
Current potential is the initial voltage；
In the control for the second reset signal that the data write phase, the data write circuit are inputted in the second reset terminal
The first end of the driving circuit is written in data voltage on data line by the lower control of system, and the compensation control circuit is in the grid
Under the control of the gate drive signal of line input, controls and connect between the control terminal of driving circuit and the second end of the driving circuit
Logical, the driving circuit controls to be connected between its first end and the second end of the driving circuit, to pass through the data voltage
It charges to the accumulator, until the driving circuit disconnects the company between its first end and the second end of the driving circuit
It connects；
In the control for the LED control signal that the light emitting phase, the emission control circuit are inputted in light emitting control line
Under, control and be connected between the first end of the driving circuit and first voltage end, and control the second end of the driving circuit with
It is connected between the light-emitting component, the driving circuit drives the light-emitting component to shine.
Display device described in the embodiment of the present invention includes above-mentioned pixel circuit.
Display device provided by the embodiment of the present invention can be mobile phone, tablet computer, television set, display, notebook
Any products or components having a display function such as computer, Digital Frame, navigator.
The above is a preferred embodiment of the present invention, it is noted that for those skilled in the art
For, without departing from the principles of the present invention, it can also make several improvements and retouch, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (11)
1. a kind of pixel circuit, including light-emitting component, which is characterized in that the pixel circuit further includes driving circuit and initialization
The control terminal of circuit, the driving circuit is connect with control node, and the first end of the driving circuit is connect with first voltage end,
The second end of the driving circuit is connect with the light-emitting component；
The initializing circuit is connect with the first reset terminal, the second end of the driving circuit and initial voltage line respectively, is used for
Under the control of the first reset signal of first reset terminal input, the initial voltage on the initial voltage line is write in control
Enter the second end of the driving circuit.
2. pixel circuit as described in claim 1, which is characterized in that the initializing circuit includes initialization transistor；
The control electrode of the initialization transistor is connect with first reset terminal, the first pole of the initialization transistor and institute
The second end connection of driving circuit is stated, the second pole of the initialization transistor is connect with initial voltage line.
3. pixel circuit as described in claim 1, which is characterized in that the driving circuit includes driving transistor；
The control terminal of the extremely described driving circuit of control of the driving transistor, the first of the driving transistor are extremely described
The first end of driving circuit, the second end of the second extremely described driving circuit of the driving transistor.
4. the pixel circuit as described in any claim in claims 1 to 3, which is characterized in that further include accumulator, mend
Repay control circuit, data write circuit and emission control circuit, wherein
The first end of the accumulator is connect with the first voltage end, the second end of the accumulator and driving electricity
The control terminal on road connects, the current potential of the control terminal for controlling the driving circuit；
The compensation control circuit connects with the second end of grid line, the control terminal of the driving circuit and the driving circuit respectively
It connects, for controlling the control for the driving circuit that is turned on or off under the control for the gate drive signal that the grid line inputs
Connection between end and the second end of the driving circuit；
The data write circuit is connect with the first end of the second reset terminal, data line and the driving circuit respectively, is used for
Under the control of second reset signal of the second reset terminal input, the driving is written in the data voltage on data line by control
The first end of circuit；
The emission control circuit respectively with light emitting control line, the first voltage end, the driving circuit first end, described
The second end of driving circuit is connected with the light-emitting component, the control of the LED control signal for inputting in the light emitting control line
Under system, connection between the first end for the driving circuit that is turned on or off and the first voltage end, and the institute that is turned on or off
State the connection between the second end of driving circuit and the light-emitting component.
5. pixel circuit as claimed in claim 4, which is characterized in that the accumulator includes storage capacitance；
The first end of the storage capacitance is connect with the first voltage end, the second end of the storage capacitance and driving electricity
The control terminal on road connects；
The compensation control circuit includes compensation control transistor；
It is described compensation control transistor control electrode connect with the grid line, it is described compensate control transistor the first pole with it is described
The control terminal of driving circuit connects, and the second pole of the compensation control transistor is connect with the second end of the driving circuit.
6. pixel circuit as claimed in claim 4, which is characterized in that the data write circuit includes data write-in crystal
Pipe；
The control electrode of the data writing transistor is connect with second reset terminal, the first pole of the data writing transistor
It is connect with the first end of the driving circuit, the second pole of the data writing transistor is connect with the data line；
The emission control circuit includes the first light emitting control transistor and the second light emitting control transistor；
The control electrode of the first light emitting control transistor is connect with the light emitting control line, the first light emitting control transistor
The first pole connect with the first voltage end, the of the second pole of the first light emitting control transistor and the driving circuit
One end connection；
The control electrode of the second light emitting control transistor is connect with the light emitting control line, the second light emitting control transistor
The first pole connect with the second end of the driving circuit, the second pole of the second light emitting control transistor and the luminous member
Part connection.
7. the pixel circuit as described in any claim in claims 1 to 3, which is characterized in that it further include reset circuit, point
It is not connect with grid line, the first pole of the light-emitting component and initial voltage line, the gate driving letter for being inputted in the grid line
Number control under, control and be connected between the first pole of the light-emitting component and the initial voltage line；
Second pole of the light-emitting component is connect with second voltage end.
8. pixel circuit as claimed in claim 7, which is characterized in that the reset circuit includes reset transistor；
The control electrode of the reset transistor is connect with the grid line, the first pole of the reset transistor and the light-emitting component
The first pole connection, the second pole of the reset transistor is connect with the initial voltage line.
9. a kind of driving method of pixel circuit, which is characterized in that for driving such as any claim in claim 1 to 8
The driving method of the pixel circuit, the pixel circuit includes:
In initial phase, for initializing circuit under the control for the first reset signal that the first reset terminal inputs, control will be initial
The second end of initial voltage write driver circuit on pressure-wire.
10. the driving method of pixel circuit as claimed in claim 9, which is characterized in that the pixel circuit includes energy storage electricity
Road, compensation control circuit, data write circuit and emission control circuit are additionally provided with data after the initial phase and write
Enter stage and light emitting phase, the driving method of the pixel circuit further include:
In the gate driving letter that the initial phase and the data write phase, the compensation control circuit are inputted in grid line
Number control under, control and be connected between the control terminal of driving circuit and the second end of the driving circuit；
In the control for the second reset signal that the data write phase, the data write circuit are inputted in the second reset terminal
Under, the data voltage on data line is written to the first end of the driving circuit, the driving circuit controls its first end and institute
It states and is connected between the second end of driving circuit, to be charged by the data voltage to the accumulator, until the driving
Circuit disconnects the connection between its first end and the second end of the driving circuit；
In the light emitting phase, the emission control circuit is under the control for the LED control signal that light emitting control line inputs, control
Make and be connected between the first end of the driving circuit and first voltage end, and control the driving circuit second end and the hair
It is connected between optical element, the driving circuit drives the light-emitting component to shine.
11. a kind of display device, which is characterized in that including the pixel electricity as described in any claim in claim 1 to 8
Road.
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| CN201811415519.0A CN109215585A (en) | 2018-11-26 | 2018-11-26 | Pixel circuit and its driving method and display device |
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|---|---|---|---|
| CN201811415519.0A CN109215585A (en) | 2018-11-26 | 2018-11-26 | Pixel circuit and its driving method and display device |
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| CN109215585A true CN109215585A (en) | 2019-01-15 |
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| CN201811415519.0A Pending CN109215585A (en) | 2018-11-26 | 2018-11-26 | Pixel circuit and its driving method and display device |
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| CN110942743A (en) * | 2019-12-26 | 2020-03-31 | 云谷（固安）科技有限公司 | Driving method of pixel circuit, display panel and display device |
| CN111243526A (en) * | 2020-01-19 | 2020-06-05 | 京东方科技集团股份有限公司 | Pixel circuit, display device and driving method |
| CN111354307A (en) * | 2020-04-09 | 2020-06-30 | 上海天马有机发光显示技术有限公司 | Pixel driving circuit and driving method and organic light-emitting display panel |
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| WO2022078076A1 (en) * | 2020-10-12 | 2022-04-21 | Oppo广东移动通信有限公司 | Pixel driving circuit and method, and display device |
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