CN109817157A - A kind of pixel-driving circuit and its control method, display device - Google Patents
A kind of pixel-driving circuit and its control method, display device Download PDFInfo
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- CN109817157A CN109817157A CN201910223006.8A CN201910223006A CN109817157A CN 109817157 A CN109817157 A CN 109817157A CN 201910223006 A CN201910223006 A CN 201910223006A CN 109817157 A CN109817157 A CN 109817157A
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Abstract
The invention discloses a kind of pixel-driving circuit and its control methods, display device, wherein, pixel-driving circuit is connect with external control circuit and N number of light-emitting component respectively, is inputted sub-circuit, is connect respectively with external control circuit, first node, reference signal end and data signal end；Sub-circuit is read, controls sub-circuit with outside respectively, first node is connected with signal end is read；Node control sub-circuit is connect with first node, the first scanning end, the second scanning end, the first power end, second node and third node respectively；Light emitting control sub-circuit is connect with second node, third node, the first power end, N number of light emitting control end and N number of light-emitting component respectively, and light emitting control end and light-emitting component correspond.Technical solution provided by the invention can reduce the quantity of component in pixel-driving circuit in OLED display panel, and then promote the pixel density of OLED display panel.
Description
Technical field
The present invention relates to field of display technology, and in particular to a kind of pixel-driving circuit and its control method, display device.
Background technique
Organic Light Emitting Diode (Organic Light Emitting Diode, abbreviation OLED) is sent out as a kind of current mode
Optical device has many advantages, such as self-luminous, quick response, wide viewing angle and can be made in flexible substrate and be widely used in
High-performance display field.
It in the related technology, include multiple pixel units and multiple pixel-driving circuits, pixel unit in OLED display panel
It is corresponded with pixel-driving circuit, pixel unit is connected with corresponding pixel-driving circuit, and each pixel unit is as pixel
The light-emitting component of driving circuit driving, specifically, including that driving transistor is driven with exporting to light-emitting component in pixel-driving circuit
Streaming current.Through inventors have found that in pixel-driving circuit included by OLED display panel component (such as: film crystal
Pipe) quantity it is more, to affect the promotion of the pixel density of OLED display panel.
It should be noted that information is only used for reinforcing the understanding to background disclosed in above-mentioned background technology part, therefore
It may include the information not constituted to the prior art known to persons of ordinary skill in the art.
Summary of the invention
In order to solve the above-mentioned technical problems, the present invention provides a kind of pixel-driving circuit and its control methods, display dress
It sets, reduces the quantity of the component in pixel-driving circuit, and then improve the pixel density of OLED display panel.
In a first aspect, the embodiment of the present invention provides a kind of pixel-driving circuit, respectively with external control circuit and N number of shine
Element connection, the pixel-driving circuit include: input sub-circuit, read sub-circuit, node control sub-circuit and light emitting control
Sub-circuit, N >=2；
The input sub-circuit connects with external control circuit, first node, reference signal end and data signal end respectively
It connects, for providing the signal of reference signal end or data signal end to first node under the control of external control circuit；
The reading sub-circuit controls sub-circuit with outside respectively, and first node is connected with signal end is read, for outside
Portion controls under the control of sub-circuit, from the signal for reading signal end reading first node；
The node control sub-circuit, respectively with first node, the first scanning end, the second scanning end, the first power end,
Two nodes are connected with third node, for providing the signal of first node to second node under the control of the first scanning end,
Under the control of second scanning end, the signal of first node is provided to third node；
The light emitting control sub-circuit, respectively with second node, third node, the first power end, N number of light emitting control end and
N number of light-emitting component connection, for driving N number of luminous member under the control of second node, third node and N number of light emitting control end
Part shines, and the light emitting control end and the light-emitting component correspond.
Optionally, the input sub-circuit includes: first switch and the second switch, and the first switch and described second is opened
It closes and is opened or closed by external control circuit control；
The first end of the first switch is connect with reference signal end, and second end is connect with first node；
The first end of the second switch is connect with data signal end, and second end is connect with first node.
Optionally, the reading sub-circuit includes: third switch, and the third switch is controlled by the external control circuit
It is opened or closed；
The first end of the third switch is connect with signal end is read, and second end is connect with first node.
Optionally, the node control sub-circuit includes: first switch transistor, second switch transistor, first capacitor
With the second capacitor；
The control electrode of the first switch transistor is connect with the first scanning end, and the first pole is connect with first node,
Second pole is connect with second node；
The control electrode of the second switch transistor is connect with the second scanning end, and the first pole is connect with first node,
Second pole is connect with third node；
The first end of the first capacitor is connect with second node, and second end is connect with the first power end；
The first end of second capacitor is connect with second node, and second end is connect with third node.
Optionally, each light-emitting component includes: Organic Light Emitting Diode, the anode of the Organic Light Emitting Diode with it is described
The connection of light emitting control sub-circuit, cathode are connect with second source end.
Optionally, the light emitting control sub-circuit includes: that driving transistor and third switching transistor~N+2 switch are brilliant
Body pipe；
The control electrode of the driving transistor connect with second node, and source electrode is connect with third node, is drained and the
The connection of one power end；
The control electrode of i-th switching transistor is connect with the i-th -2 light emitting control ends, and the first pole is connect with third node,
The anode of its second pole Organic Light Emitting Diode corresponding with the i-th -2 light emitting control ends connects, 3≤i≤N+2.
Optionally, the input sub-circuit includes: first switch and the second switch；The reading sub-circuit includes: third
Switch；The node control sub-circuit includes: first switch transistor, second switch transistor, first capacitor and the second capacitor；
The light emitting control sub-circuit includes: driving transistor and third switching transistor~N+2 switching transistor；
The first end of the first switch is connect with reference signal end, and second end is connect with first node；
The first end of the second switch is connect with data signal end, and second end is connect with first node；
The first end of the third switch is connect with signal end is read, and second end is connect with first node；
The control electrode of the first switch transistor is connect with the first scanning end, and the first pole is connect with first node,
Second pole is connect with second node；
The control electrode of the second switch transistor is connect with the second scanning end, and the first pole is connect with first node,
Second pole is connect with third node；
The first end of the first capacitor is connect with second node, and second end is connect with the first power end；
The first end of second capacitor is connect with second node, and second end is connect with third node；
The control electrode of the driving transistor connect with second node, and source electrode is connect with third node, is drained and the
The connection of one power end；
The control electrode of i-th switching transistor is connect with the i-th -2 light emitting control ends, and the first pole is connect with third node,
The light-emitting component connection corresponding with the i-th -2 light emitting control ends of its second pole, 3≤i≤N+2.
Optionally, the external control sub-circuit is also used to the signal according to first node, obtains the threshold of driving transistor
Threshold voltage, and offset voltage is obtained according to threshold voltage, it is also used to provide the offset voltage to the data signal end, so that
It obtains the pixel-driving circuit and driving transistor is compensated according to offset voltage.
Second aspect, the embodiment of the present invention also provide a kind of control method of pixel-driving circuit, are applied to above-mentioned pixel
In driving circuit, which comprises
It inputs sub-circuit and provides the signal at reference signal end to first node, node control sub-circuit is in the first scanning end
Under control, the signal of first node is provided to second node, under the control of the second scanning end, provides first segment to third node
The signal of point；
It inputs sub-circuit and provides the signal of data signal end to first node, node control sub-circuit is in the first scanning end
Under control, the signal of first node is provided to second node；
Node control sub-circuit provides the signal of third node under the control of the second scanning end, to first node, reads
Sub-circuit is under the control of external control sub-circuit, from the signal for reading signal end reading first node；
Node control sub-circuit provides the signal of first node under the control of the first scanning end, to second node, shines
It controls sub-circuit to be used under the control of second node, third node and N number of light emitting control end, N number of light-emitting component is driven to shine.
The third aspect, the embodiment of the present invention also provide a kind of display device, comprising: above-mentioned pixel-driving circuit.
The embodiment of the present invention provides a kind of pixel-driving circuit and its control method, display device, wherein pixel driver electricity
Road is connect with external control circuit and N number of light-emitting component respectively, pixel-driving circuit include: input sub-circuit, read sub-circuit,
Node control sub-circuit and light emitting control sub-circuit, N >=2；Input sub-circuit, respectively with external control circuit, first node, ginseng
It examines signal end to connect with data signal end, for providing reference signal end to first node under the control of external control circuit
Or the signal of data signal end；Sub-circuit is read, controls sub-circuit with outside respectively, first node is connected with signal end is read,
For reading the signal of first node from reading signal end under the control of external control sub-circuit；Node control sub-circuit, point
It is not connect with first node, the first scanning end, the second scanning end, the first power end, second node and third node, for the
Under the control of one scanning end, the signal of first node is provided to second node, under the control of the second scanning end, to third node
The signal of first node is provided；Light emitting control sub-circuit, respectively with second node, third node, the first power end, it is N number of shine
Control terminal is connected with N number of light-emitting component, for driving N under the control of second node, third node and N number of light emitting control end
A light-emitting component shines, and light emitting control end and light-emitting component correspond.Pixel-driving circuit provided in an embodiment of the present invention with
A plurality of light-emitting elements connection can be reduced in OLED display panel in pixel-driving circuit with driving a plurality of light-emitting elements to shine
The quantity of component, and then promote the pixel density of OLED display panel.
Other features and advantages of the present invention will be illustrated in the following description, also, partly becomes from specification
It obtains it is clear that understand through the implementation of the invention.The objectives and other advantages of the invention can be by specification, right
Specifically noted structure is achieved and obtained in claim and attached drawing.
Detailed description of the invention
Attached drawing is used to provide to further understand technical solution of the present invention, and constitutes part of specification, with this
The embodiment of application technical solution for explaining the present invention together, does not constitute the limitation to technical solution of the present invention.
Fig. 1 is the structural schematic diagram of pixel-driving circuit provided in an embodiment of the present invention；
Fig. 2 is the equivalent circuit diagram of input sub-circuit provided in an embodiment of the present invention；
Fig. 3 is the equivalent circuit diagram provided in an embodiment of the present invention for reading sub-circuit；
Fig. 4 is the equivalent circuit diagram of node control sub-circuit provided in an embodiment of the present invention；
Fig. 5 is the equivalent circuit diagram of light emitting control sub-circuit provided in an embodiment of the present invention；
Fig. 6 is the equivalent circuit diagram of pixel-driving circuit provided in an embodiment of the present invention；
Fig. 7 is the working timing figure of pixel-driving circuit provided in an embodiment of the present invention；
Fig. 8 A is working state figure of the pixel-driving circuit provided in an embodiment of the present invention in reset phase；
Fig. 8 B is working state figure of the pixel-driving circuit provided in an embodiment of the present invention in compensated stage；
Fig. 8 C is working state figure of the pixel-driving circuit provided in an embodiment of the present invention in the stage of reading；
Fig. 8 D is working state figure of the pixel-driving circuit provided in an embodiment of the present invention in light emitting phase；
Fig. 9 is the flow chart of the control method of pixel-driving circuit provided in an embodiment of the present invention.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with attached drawing to the present invention
Embodiment be described in detail.It should be noted that in the absence of conflict, in the embodiment and embodiment in the application
Feature can mutual any combination.
Step shown in the flowchart of the accompanying drawings can be in a computer system such as a set of computer executable instructions
It executes.Also, although logical order is shown in flow charts, and it in some cases, can be to be different from herein suitable
Sequence executes shown or described step.
Unless otherwise defined, the embodiment of the present invention discloses the technical term used or scientific term should be institute of the present invention
The ordinary meaning that personage in category field with general technical ability is understood." first ", " second " used in the embodiment of the present invention
And similar word is not offered as any sequence, quantity or importance, and be used only to distinguish different component parts.
The similar word such as " comprising " or "comprising", which means to occur element or object before the word, to be covered to appear in and arranges behind the word
The element of act perhaps object and its equivalent and be not excluded for other elements or object.The similar word such as " connection " or " connected "
Language is not limited to physics or mechanical connection, but may include electrical connection, either direct or indirect
's.
The source electrode of the switching transistor used in all embodiments of the invention, drain electrode are symmetrically, so its source electrode, drain electrode
It can be interchanged.In embodiments of the present invention, to distinguish the two poles of the earth of switching transistor in addition to grid, will wherein source electrode be known as
First pole, drain electrode is known as the second pole, and grid is become control electrode.In addition, switching transistor used by the embodiment of the present invention
It include: p-type switching transistor or two kinds of N-type switching transistor, wherein p-type switching transistor is low level conducting in grid,
Grid ends when being high level, and N-type switching transistor is connected when grid is high level, ends when grid is low level.
Embodiment one
The embodiment of the present invention provides a kind of pixel-driving circuit, and Fig. 1 is pixel-driving circuit provided in an embodiment of the present invention
Structural schematic diagram, as shown in Figure 1, pixel-driving circuit provided in an embodiment of the present invention is respectively with external control circuit (in figure
It is not shown) it is connected with N number of light-emitting component, which includes: input sub-circuit, reads sub-circuit, node control
Circuit and light emitting control sub-circuit, wherein N >=2.
Specifically, input sub-circuit, respectively with external control circuit, first node N1, reference signal end REF sum number it is believed that
Number end DATA connection provides reference signal end REF to first node N1 or data is believed under the control of external control circuit
Number end DATA signal；Sub-circuit is read, controls sub-circuit with outside respectively, first node N1 and reading signal end SENSE connect
It connects, for reading the signal of first node N1 from reading signal end SENSE under the control of external control sub-circuit；Node control
System circuit, respectively with first node N1, the first scanning end SCAN1, the second scanning end SCAN2, the first power end VDD, second
Node N2 is connected with third node N3, for providing first node to second node N2 under the control of the first scanning end SCAN1
The signal of N1 provides the signal of first node N1 to third node N3 under the control of the second scanning end SCAN2；Light emitting control
Sub-circuit, respectively with second node N2, third node N3, the first power end VDD, N number of light emitting control end EM1, EM2 ... EMN
Connected with N number of light-emitting component, for second node N2, third node N3 and N number of light emitting control end EM1, EM2 ... EMN's
Under control, N number of light-emitting component is driven to shine, wherein EMi indicates i-th of light emitting control end.
Specifically, pixel-driving circuit is arranged in OLED display panel, OLED display panel includes multiple pixel units,
Each pixel unit is a light-emitting component, i.e., a pixel-driving circuit and multiple pixel units pair in the embodiment of the present invention
It answers.
In the present embodiment, light emitting control end and light-emitting component are corresponded.It should be noted that due to OLED display panel
Show the difference of content, N number of light-emitting component does not shine simultaneously, but successively shines.
In the present embodiment, the first power end VDD persistently provides high level signal, and reference signal end REF persistently provide reference
Signal such as voltage value is the signal of 0V, i.e. reference signal end REF can be ground terminal.It should be noted that external control electricity
Road can also provide letter to reference signal end REF, data signal end DATA, the first scanning end SCAN1 and the second scanning end SCAN1
Number, to control the input of reference signal end REF, data signal end DATA, the first scanning end SCAN1 and the second scanning end SCAN2
Signal.
Pixel-driving circuit provided in an embodiment of the present invention is connect with external control circuit and N number of light-emitting component respectively, as
Plain driving circuit includes: input sub-circuit, reads sub-circuit, node control sub-circuit and light emitting control sub-circuit, N >=2；Input
Sub-circuit is connect with external control circuit, first node, reference signal end and data signal end respectively, for controlling in outside
Under the control of circuit, the signal of reference signal end or data signal end is provided to first node；Read sub-circuit, respectively with outside
It controls sub-circuit, first node and reads signal end and connect, under the external control for controlling sub-circuit, from reading signal end
Read the signal of first node；Node control sub-circuit, respectively with first node, the first scanning end, the second scanning end, first electricity
Source, second node are connected with third node, for providing first node to second node under the control of the first scanning end
Signal provides the signal of first node to third node under the control of the second scanning end；Light emitting control sub-circuit, respectively with
Second node, third node, the first power end, N number of light emitting control end are connected with N number of light-emitting component, in second node, the
Under the control at three nodes and N number of light emitting control end, N number of light-emitting component is driven to shine, light emitting control end and light-emitting component one are a pair of
It answers.Pixel-driving circuit provided in an embodiment of the present invention is connect with a plurality of light-emitting elements, to drive a plurality of light-emitting elements to shine, energy
The quantity of component in pixel-driving circuit in OLED display panel is enough reduced, and then the pixel for promoting OLED display panel is close
Degree.
Optionally, light-emitting component can be Organic Light Emitting Diode OLED, specifically, the sun of Organic Light Emitting Diode OLED
Pole is connect with light emitting control sub-circuit, and cathode is connect with second source end VSS.
In the present embodiment, second source end VSS persistently provide low level signal.
Optionally, Fig. 2 is the equivalent circuit diagram of input sub-circuit provided in an embodiment of the present invention, as shown in Fig. 2, of the invention
The input sub-circuit that embodiment provides includes: first switch SW1 and second switch SW2, first switch SW1 and second switch SW2
It is opened or closed by external control circuit control.
Specifically, the first end of first switch SW1 is connect with reference signal end REF, second end and first node N1 connect
It connects；The first end of second switch SW2 is connect with data signal end DATA, and second end is connect with first node N1.
In the present embodiment, data signal end DATA and the public conducting wire of reference signal end REF reduce wiring, into one
Improve the pixel density of OLED display panel to step.
It should be noted that the exemplary structure of input sub-circuit has been shown in particular in Fig. 2, those skilled in the art are easy reason
Solution, the implementation of the sub-circuit is not limited to this, as long as can be realized its function.
Optionally, Fig. 3 is the equivalent circuit diagram provided in an embodiment of the present invention for reading sub-circuit, as shown in figure 3, of the invention
The reading sub-circuit that embodiment provides includes: third switch SW3, and third switch SW3 is controlled by external control circuit and disconnected or close
It closes.
Specifically, the first end of third switch SW3 is connect with signal end SENSE is read, second end and first node N1
Connection.
It should be noted that the exemplary structure for reading sub-circuit has been shown in particular in Fig. 3, those skilled in the art are easy reason
Solution, the implementation of the sub-circuit is not limited to this, as long as can be realized its function.
Optionally, Fig. 4 is the equivalent circuit diagram of node control sub-circuit provided in an embodiment of the present invention, as shown in figure 4, this
The node control sub-circuit that inventive embodiments provide includes: first switch transistor M1, second switch transistor M2, first capacitor
C1 and the second capacitor C2.
Specifically, the control electrode of first switch transistor M1 is connect with the first scanning end SCAN1, the first pole and first segment
Point N1 connection, the second pole is connect with second node N2；The control electrode of second switch transistor M2 and the second scanning end SCAN2 connect
It connects, the first pole is connect with first node N1, and the second pole is connect with third node N3；The first end of first capacitor C1 and second
Node N2 connection, second end are connect with the first power end VDD；The first end of second capacitor C2 is connect with second node N2,
Second end is connect with third node N3.
It should be noted that the exemplary structure of node control sub-circuit has been shown in particular in Fig. 4, those skilled in the art hold
Intelligible to be, the implementation of the sub-circuit is not limited to this, as long as can be realized its function.
Optionally, Fig. 5 is the equivalent circuit diagram of light emitting control sub-circuit provided in an embodiment of the present invention, such as
Shown in Fig. 5, light emitting control sub-circuit provided in an embodiment of the present invention includes: driving transistor DTFT and third switch
Transistor M3~N+2 switching transistor MN+2.
Specifically, the control electrode of driving transistor DTFT is connect with second node N2, source electrode is connect with third node N3,
Its drain electrode is connect with the first power end VDD；The control electrode of i-th switching transistor Mi is connect with the i-th -2 light emitting control ends, the
One pole is connect with third node N3, the sun of the second pole Organic Light Emitting Diode OLED corresponding with the i-th -2 light emitting control ends
Pole connection, 3≤i≤N+2.
By taking N=2 as an example, the control electrode of third switching transistor M3 is connect with first light emitting control end EM1, the second pole
It is connect with the anode of first Organic Light Emitting Diode OLED1, the control electrode of the 4th switching transistor M4 and second control that shines
EM2 connection in end processed, the second pole are connect with the anode of second Organic Light Emitting Diode OLED2, it should be noted that N may be used also
Think other numerical value for being greater than 2, the embodiment of the present invention is not limited in any way this.
It should be noted that the exemplary structure of light emitting control sub-circuit has been shown in particular in Fig. 5, those skilled in the art hold
Intelligible to be, the implementation of the sub-circuit is not limited to this, as long as can be realized its function.
Optionally, the driving transistor DTFT in the present embodiment can be enhancement transistor or depletion mode transistor,
Here this is not especially limited.
Fig. 6 is the equivalent circuit diagram of pixel-driving circuit provided in an embodiment of the present invention, as shown in fig. 6, pixel driver is electric
Road includes: input sub-circuit, reads sub-circuit, node control sub-circuit and light emitting control sub-circuit, wherein input sub-circuit,
It include: first switch SW1 and second switch SW2；Reading sub-circuit includes: third switch SW3；Node control sub-circuit includes:
First switch transistor M1, second switch transistor M2, first capacitor C1 and the second capacitor C2；Light emitting control sub-circuit includes:
Drive transistor DTFT and third switching transistor M3~N+2 switching transistor MN+2.
Specifically, the first end of first switch SW1 is connect with reference signal end REF, second end and first node N1 connect
It connects；The first end of second switch SW2 is connect with data signal end DATA, and second end is connect with first node N1；Third switch
The first end of SW3 is connect with signal end SENSE is read, and second end is connect with first node N1；First switch transistor M1's
Control electrode is connect with the first scanning end SCAN1, and the first pole is connect with first node N1, and the second pole and second node N2 connect
It connects；The control electrode of second switch transistor M2 is connect with the second scanning end SCAN2, and the first pole is connect with first node N1,
Second pole is connect with third node N3；The first end of first capacitor C1 is connect with second node N2, second end and the first power supply
Hold VDD connection；The first end of second capacitor C2 is connect with second node N2, and second end is connect with third node N3；Driving is brilliant
The control electrode of body pipe DTFT is connect with second node N2, and source electrode is connect with third node N3, drain electrode and the first power end VDD
Connection；The control electrode of i-th switching transistor Mi is connect with the i-th -2 light emitting control end EM, and the first pole and third node N3 connect
It connects, the light-emitting component connection corresponding with the i-th -2 light emitting control ends of the second pole, 3≤i≤N+2.
In the present embodiment, optionally, outside control sub-circuit is also used to the signal according to first node N1, and it is brilliant to obtain driving
The threshold voltage vt h of body pipe DTFT, and offset voltage is obtained according to threshold voltage, it is also used to provide benefit to data signal end DATA
Voltage is repaid, so that pixel-driving circuit compensates driving transistor according to offset voltage.
In the present embodiment, switching transistor M1~MN+2 all can be N-type TFT or P-type TFT,
It can unify process flow, manufacturing process can be reduced, help to improve the yield of product.In addition, it is contemplated that low temperature polycrystalline silicon
The leakage current of thin film transistor (TFT) is smaller, and therefore, preferably all transistors of the embodiment of the present invention are low-temperature polysilicon film transistor,
Thin film transistor (TFT) specifically can choose the thin film transistor (TFT) of bottom grating structure or the thin film transistor (TFT) of top gate structure, as long as can be real
Existing switching function.
It is N-type film crystal with switching transistor M1~MN+2 in pixel-driving circuit provided in an embodiment of the present invention
For pipe, Fig. 7 is the working timing figure of pixel-driving circuit provided in an embodiment of the present invention, and Fig. 8 A provides for the embodiment of the present invention
Pixel-driving circuit reset phase working state figure；Fig. 8 B is that pixel-driving circuit provided in an embodiment of the present invention is being mended
Repay the working state figure in stage；Fig. 8 C is working condition of the pixel-driving circuit provided in an embodiment of the present invention in the stage of reading
Figure；Fig. 8 D is working state figure of the pixel-driving circuit provided in an embodiment of the present invention in light emitting phase.As can be seen from figures 6 to 8, originally
Pixel-driving circuit involved in inventive embodiments includes: N+2 switching transistor (M1~MN+2), 1 driving transistor
(DTFT), 2 capacitor cells (C1 and C2), N+4 input terminal (DATA, REF, SCAN1, SCAN2, EM1, EM2 ...,
EMN), 1 reading end (SENSE) and 2 power ends (VDD and VSS).
Specifically, the first power end VDD persistently provides high level signal, second source end VSS persistently provides low level letter
Number, reference signal end REF persistently provide reference signal, wherein the voltage of reference signal is 0V.
Specifically:
First stage S1, i.e. reset phase, in conjunction with Fig. 7 and Fig. 8 A, external control circuit opens first switch SW1, to the
The signal of the signal of one node N1 offer reference signal end REF, the first scanning end SCAN1 and the second scanning end SCAN2 are high electricity
Flat, first switch transistor M1 and second switch transistor M2 are connected, and the signal of second node N2 and third node N3 are by first
The signal of node N1 is reset.
Second stage S2, i.e. compensated stage, in conjunction with Fig. 7 and Fig. 8 B, external control circuit disconnects first switch SW1, closure
Second switch SW2 provides the signal of data signal end DATA to first node N1, wherein the signal of data signal end DATA
Voltage value is V0, and the signal of the first scanning end SCAN1 is high level, first switch transistor M1 conducting, the letter of second node N2
It number is drawn high by the signal of first node N1, since the difference of the current potential of second node N2 and third node N3 is greater than driving transistor
The threshold voltage vt h of DTFT, therefore, driving transistor DTFT conducting, the first power end VDD charge to third node N3, until
The voltage value of the signal of third node N3 is equal to V0-Vth, driving transistor DTFT cut-off, at this point, storing electricity in the second capacitor C2
Amount is Vth.
Phase III S3, i.e. reading stage, in conjunction with Fig. 7 and Fig. 8 C, external control circuit disconnects second switch SW2, closure
The signal of third switch SW3, the second scanning end SCAN2 are high level, second switch transistor M2 conducting, external control circuit control
System reads the signal that signal end SENSE reads third node N3, to obtain the threshold voltage vt h of driving transistor DTFT.
Fourth stage S4, i.e. light emitting phase, in conjunction with Fig. 7 and Fig. 8 D, external control circuit disconnects third switch SW3, closure
Second switch SW2 provides the signal V1 of data signal end DATA to first node N1, specifically, light emitting phase includes: timesharing hair
N number of sub- light emitting phase of light, wherein i-th of sub- light emitting phase is corresponding with i-th of Organic Light Emitting Diode OLEDi, i.e., and i-th
I-th of organic light-emitting diode OLEDi shines in sub- light emitting phase, 1≤i≤N, specifically, every sub- light emitting phase packet
It includes: the first sub-stage and the second sub-stage, specific:
First sub-stage, the signal of the first scanning end SCAN1 are high level, first switch transistor M1 conducting, to second
Node N2 provides the signal of first node N1, since the difference of the current potential of second node N2 and third node N3 is greater than driving transistor
The threshold voltage vt h of DTFT, therefore, driving transistor DTFT conducting, but due to i-th OLEDi pairs of Organic Light Emitting Diode
The signal of the light emitting control end EMi answered is low level, and therefore, i-th of Organic Light Emitting Diode OLEDi does not shine.
Second sub-stage, the signal of the first scanning end SCAN1 are low level, first switch transistor M1 cut-off, first
Under the action of capacitor C1 bootstrapping, driving transistor DTFT conducting, the corresponding light emitting control of i-th of Organic Light Emitting Diode OLEDi
The signal for holding EMi is high level, and therefore, i-th of Organic Light Emitting Diode OLEDi shines.
It should be noted that the signal V1 of data signal end DATA is different when different organic light-emitting diode.
In the present embodiment, in every sub- light emitting phase, the data-signal of data signal end DATA is external control circuit root
It is obtained according to threshold voltage, in light emitting phase, inputs the data-signal to the control electrode of driving transistor DTFT, it can be organic
When light emitting diode OLED shines, threshold voltage compensation is carried out to driving transistor DTFT, guarantees the uniformity of display, improves
Display effect.
Pixel-driving circuit driving a plurality of light-emitting elements provided in an embodiment of the present invention and a picture in the related technology
Plain driving circuit drives a light-emitting component to compare, and when the light-emitting component quantity of luminescence display is identical, the embodiment of the present invention is mentioned
Only one driving transistor is compensated in compensated stage for technical solution, the compensation time is reduced to benefit in the related technology
Repay the 1/N of time.
Embodiment two
Inventive concept based on the above embodiment, the embodiment of the present invention also provide a kind of controlling party of pixel-driving circuit
Method, Fig. 9 is the flow chart of the control method of pixel-driving circuit provided in an embodiment of the present invention, as shown in figure 9, the present invention is implemented
Example provide pixel-driving circuit driving method specifically includes the following steps:
Step 100, input sub-circuit provide the signal at reference signal end to first node, and node control sub-circuit is first
Under the control of scanning end, the signal for providing first node to second node is mentioned under the control of the second scanning end to third node
For the signal of first node.
Step 200, input sub-circuit provide the signal of data signal end to first node, and node control sub-circuit is first
Under the control of scanning end, the signal of first node is provided to second node.
Step 300, node control sub-circuit provide the letter of third node under the control of the second scanning end, to first node
Number, sub-circuit is read under the control of external control sub-circuit, from the signal for reading signal end reading first node.
Step 400, node control sub-circuit provide the letter of first node under the control of the first scanning end, to second node
Number, light emitting control sub-circuit is used under the control of second node, third node and N number of light emitting control end, drives N number of luminous member
Part shines.
Wherein, pixel-driving circuit is the pixel-driving circuit that embodiment one provides, realization principle and realization effect class
Seemingly, details are not described herein.
Optionally, before step 400, outside control sub-circuit is also used to the signal according to first node, is driven
The threshold voltage of transistor, and offset voltage is obtained according to threshold voltage, it is also used to provide offset voltage to data signal end, with
So that pixel-driving circuit compensates driving transistor according to offset voltage in light emitting phase.
Embodiment three
Inventive concept based on the above embodiment, the embodiment of the present invention also provide a kind of display device, the embodiment of the present invention
The display device of offer includes: pixel-driving circuit.
Optionally, which can be with are as follows: mobile phone, tablet computer, television set, display, laptop, digital phase
Any products or components having a display function such as frame, navigator.
Wherein, pixel-driving circuit is the pixel-driving circuit that embodiment one provides, realization principle and realization effect class
Seemingly, details are not described herein.
Attached drawing of the embodiment of the present invention is pertained only to the present embodiments relate to the structure arrived, and other structures, which can refer to, usually to be set
Meter.
In the absence of conflict, the feature in the embodiment of the present invention, that is, embodiment can be combined with each other new to obtain
Embodiment.
Although disclosed herein embodiment it is as above, the content only for ease of understanding the present invention and use
Embodiment is not intended to limit the invention.Technical staff in any fields of the present invention is taken off not departing from the present invention
Under the premise of the spirit and scope of dew, any modification and variation, but the present invention can be carried out in the form and details of implementation
Scope of patent protection, still should be subject to the scope of the claims as defined in the appended claims.
Claims (10)
1. a kind of pixel-driving circuit, which is characterized in that connect respectively with external control circuit and N number of light-emitting component, the picture
Plain driving circuit includes: input sub-circuit, reads sub-circuit, node control sub-circuit and light emitting control sub-circuit, N >=2；
The input sub-circuit is connect with external control circuit, first node, reference signal end and data signal end respectively, is used
In under the control of external control circuit, the signal of reference signal end or data signal end is provided to first node；
The reading sub-circuit controls sub-circuit with outside respectively, and first node is connected with signal end is read, for controlling in outside
Under the control of system circuit, from the signal for reading signal end reading first node；
The node control sub-circuit, respectively with first node, the first scanning end, the second scanning end, the first power end, the second section
Point is connected with third node, for the signal of first node being provided to second node, second under the control of the first scanning end
Under the control of scanning end, the signal of first node is provided to third node；
The light emitting control sub-circuit, respectively with second node, third node, the first power end, N number of light emitting control end and N number of
Light-emitting component connection, under the control of second node, third node and N number of light emitting control end, driving N number of light-emitting component to send out
Light, the light emitting control end and the light-emitting component correspond.
2. pixel-driving circuit according to claim 1, which is characterized in that the input sub-circuit includes: first switch
And second switch, the first switch and the second switch are opened or closed by external control circuit control；
The first end of the first switch is connect with reference signal end, and second end is connect with first node；
The first end of the second switch is connect with data signal end, and second end is connect with first node.
3. pixel-driving circuit according to claim 1, which is characterized in that the reading sub-circuit includes: third switch,
The third switch is opened or closed by external control circuit control；
The first end of the third switch is connect with signal end is read, and second end is connect with first node.
4. pixel-driving circuit according to claim 1, which is characterized in that the node control sub-circuit includes: first
Switching transistor, second switch transistor, first capacitor and the second capacitor；
The control electrode of the first switch transistor is connect with the first scanning end, and the first pole is connect with first node, and second
Pole is connect with second node；
The control electrode of the second switch transistor is connect with the second scanning end, and the first pole is connect with first node, and second
Pole is connect with third node；
The first end of the first capacitor is connect with second node, and second end is connect with the first power end；
The first end of second capacitor is connect with second node, and second end is connect with third node.
5. pixel-driving circuit according to claim 1, which is characterized in that the light-emitting component is organic light-emitting diodes
Pipe, the anode of the Organic Light Emitting Diode are connect with the light emitting control sub-circuit, and cathode is connect with second source end.
6. pixel-driving circuit according to claim 5, which is characterized in that the light emitting control sub-circuit includes: driving
Transistor and third switching transistor~N+2 switching transistor；
The control electrode of the driving transistor is connect with second node, and source electrode is connect with third node, drain electrode and the first electricity
Source connection；
The control electrode of i-th switching transistor is connect with the i-th -2 light emitting control ends, and the first pole is connect with third node, the
The anode of two poles Organic Light Emitting Diode corresponding with the i-th -2 light emitting control ends connects, 3≤i≤N+2.
7. pixel-driving circuit according to claim 1, which is characterized in that the input sub-circuit includes: first switch
And second switch；The reading sub-circuit includes: third switch；The node control sub-circuit include: first switch transistor,
Second switch transistor, first capacitor and the second capacitor；The light emitting control sub-circuit includes: driving transistor and third switch
Transistor~N+2 switching transistor；
The first end of the first switch is connect with reference signal end, and second end is connect with first node；
The first end of the second switch is connect with data signal end, and second end is connect with first node；
The first end of the third switch is connect with signal end is read, and second end is connect with first node；
The control electrode of the first switch transistor is connect with the first scanning end, and the first pole is connect with first node, and second
Pole is connect with second node；
The control electrode of the second switch transistor is connect with the second scanning end, and the first pole is connect with first node, and second
Pole is connect with third node；
The first end of the first capacitor is connect with second node, and second end is connect with the first power end；
The first end of second capacitor is connect with second node, and second end is connect with third node；
The control electrode of the driving transistor is connect with second node, and source electrode is connect with third node, drain electrode and the first electricity
Source connection；
The control electrode of i-th switching transistor is connect with the i-th -2 light emitting control ends, and the first pole is connect with third node, the
The light-emitting component connection corresponding with the i-th -2 light emitting control ends of two poles, 3≤i≤N+2.
8. pixel-driving circuit according to claim 7, which is characterized in that the external control sub-circuit is also used to basis
The signal of first node obtains the threshold voltage of driving transistor, and obtains offset voltage according to threshold voltage, is also used to institute
State data signal end and the offset voltage be provided so that the pixel-driving circuit according to offset voltage to driving transistor into
Row compensation.
9. a kind of control method of pixel-driving circuit, which is characterized in that be applied to as described in any one of claims 1 to 8
In pixel-driving circuit, which comprises
It inputs sub-circuit and provides the signal at reference signal end, control of the node control sub-circuit in the first scanning end to first node
Under, the signal of first node is provided to second node, under the control of the second scanning end, provides first node to third node
Signal；
It inputs sub-circuit and provides the signal of data signal end, control of the node control sub-circuit in the first scanning end to first node
Under, the signal of first node is provided to second node；
Node control sub-circuit provides the signal of third node under the control of the second scanning end, to first node, reads son electricity
Road is under the control of external control sub-circuit, from the signal for reading signal end reading first node；
Node control sub-circuit provides the signal of first node, light emitting control under the control of the first scanning end, to second node
Sub-circuit is used under the control of second node, third node and N number of light emitting control end, and N number of light-emitting component is driven to shine.
10. a kind of display device characterized by comprising pixel-driving circuit as described in any one of claims 1 to 8.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110491319A (en) * | 2019-08-23 | 2019-11-22 | 深圳市华星光电半导体显示技术有限公司 | LED driving circuit and driving transistor electron mobility detection method |
| CN112634818A (en) * | 2020-12-23 | 2021-04-09 | 京东方科技集团股份有限公司 | Pixel driving circuit, driving method and display device |
| CN112863445A (en) * | 2021-01-21 | 2021-05-28 | 京东方科技集团股份有限公司 | Pixel driving circuit, OLED display panel and display device |
| CN113327556A (en) * | 2021-06-25 | 2021-08-31 | 合肥京东方卓印科技有限公司 | Pixel circuit, driving method thereof and display panel |
| WO2022061892A1 (en) * | 2020-09-28 | 2022-03-31 | 京东方科技集团股份有限公司 | Pixel structure and driving method therefor, and display device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140139510A1 (en) * | 2012-11-22 | 2014-05-22 | Lg Display Co., Ltd. | Organic Light Emitting Display Device |
| CN104599641A (en) * | 2015-03-02 | 2015-05-06 | 京东方科技集团股份有限公司 | OLED pixel unit and driving method thereof, as well as OLED display device |
| CN106910463A (en) * | 2017-04-28 | 2017-06-30 | 深圳市华星光电技术有限公司 | A kind of AMOLED drive circuits and display device |
| CN107221289A (en) * | 2017-08-02 | 2017-09-29 | 上海天马有机发光显示技术有限公司 | A kind of pixel-driving circuit and its control method and display panel, display device |
| CN108257549A (en) * | 2016-12-29 | 2018-07-06 | 乐金显示有限公司 | Electroluminescent display |
-
2019
- 2019-03-22 CN CN201910223006.8A patent/CN109817157A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140139510A1 (en) * | 2012-11-22 | 2014-05-22 | Lg Display Co., Ltd. | Organic Light Emitting Display Device |
| CN104599641A (en) * | 2015-03-02 | 2015-05-06 | 京东方科技集团股份有限公司 | OLED pixel unit and driving method thereof, as well as OLED display device |
| CN108257549A (en) * | 2016-12-29 | 2018-07-06 | 乐金显示有限公司 | Electroluminescent display |
| CN106910463A (en) * | 2017-04-28 | 2017-06-30 | 深圳市华星光电技术有限公司 | A kind of AMOLED drive circuits and display device |
| CN107221289A (en) * | 2017-08-02 | 2017-09-29 | 上海天马有机发光显示技术有限公司 | A kind of pixel-driving circuit and its control method and display panel, display device |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110491319A (en) * | 2019-08-23 | 2019-11-22 | 深圳市华星光电半导体显示技术有限公司 | LED driving circuit and driving transistor electron mobility detection method |
| WO2022061892A1 (en) * | 2020-09-28 | 2022-03-31 | 京东方科技集团股份有限公司 | Pixel structure and driving method therefor, and display device |
| US11847965B2 (en) | 2020-09-28 | 2023-12-19 | Chengdu Boe Optoelectronics Technology Co., Ltd. | Pixel structure, driving method thereof and display device |
| CN112634818A (en) * | 2020-12-23 | 2021-04-09 | 京东方科技集团股份有限公司 | Pixel driving circuit, driving method and display device |
| CN112863445A (en) * | 2021-01-21 | 2021-05-28 | 京东方科技集团股份有限公司 | Pixel driving circuit, OLED display panel and display device |
| CN113327556A (en) * | 2021-06-25 | 2021-08-31 | 合肥京东方卓印科技有限公司 | Pixel circuit, driving method thereof and display panel |
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