CN108320712A - Pixel circuit and display device - Google Patents
Pixel circuit and display device Download PDFInfo
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- CN108320712A CN108320712A CN201810391783.9A CN201810391783A CN108320712A CN 108320712 A CN108320712 A CN 108320712A CN 201810391783 A CN201810391783 A CN 201810391783A CN 108320712 A CN108320712 A CN 108320712A
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- 230000005669 field effect Effects 0.000 claims description 18
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- 238000010586 diagram Methods 0.000 description 12
- 239000000203 mixture Substances 0.000 description 12
- 230000003760 hair shine Effects 0.000 description 10
- 238000005516 engineering process Methods 0.000 description 8
- 230000009471 action Effects 0.000 description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
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Classifications
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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]
- G09G3/3266—Details of drivers for scan electrodes
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
- G09G3/3233—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Electroluminescent Light Sources (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Control Of El Displays (AREA)
Abstract
A kind of pixel circuit of present invention offer and display device.The pixel circuit includes write control unit, storage capacitance, driving tube, conducting control unit, Organic Light Emitting Diode；Write control unit includes the control terminal of output end, the input terminal of external data input voltage signal and external scan control signal, the stored capacity earth of output end；The grid of driving tube and the first end of storage capacitance connect, the external anode voltage signal of source electrode of driving tube；Conducting control unit includes first input end, the second input terminal, conducting control terminal and conducting output end, the drain electrode of first input end and driving tube connects, the external reset signal of control terminal is connected in second input end grounding, and the anode that output end and Organic Light Emitting Diode is connected connects.The pixel circuit can control Organic Light Emitting Diode according to reset signal and shine or extinguish whithin a period of time, reduce average brightness when the low grayscale of display screen is shown, improve contrast and image quality.
Description
Technical field
The present invention relates to display technology fields, in particular to a kind of pixel circuit and display device.
Background technology
With the continuous development of science and technology, the micromation of electronic equipment and high precision int have been increasingly becoming today's society electricity
The trend of sub- equipment development, micro display technology are developed rapidly along with demand, silicon substrate active organic LED
(AMOLED) micro display technology is shone with it with thin and light, active, visual angle is wide, without flashing, low-voltage driving, luminous effect
Rate height, fast response time, it is low in energy consumption, integrated level is high the features such as particularly important status is occupied in display technology field.
And for silicon substrate AMOLED micro display technologies, pixel circuit is directly drive during silicon substrate AMOLED micro displays
The luminous important component of dynamic OLED (Organic Light Emitting Diode) device, the composed structure of pixel circuit often determine OLED
Illuminated brightness and picture displays contrast.But existing pixel circuit is gone back on the control accuracy to OLED glow currents
It is not high enough, often so that brightness of the OLED when carrying out low grayscale display is excessively bright, drop is displayed contrast so as to cause display screen
Low, image display quality is deteriorated.
Invention content
In order to overcome above-mentioned deficiency in the prior art, the purpose of the present invention is to provide a kind of pixel circuit and display dresses
It sets, the glow current control accuracy of the pixel circuit is high, can control organic hair according to the level change situation of reset signal
Optical diode shines or extinguishes whithin a period of time, to reduce average brightness of the display screen when low grayscale is shown, improves display
Screen display contrast and image display quality.
For circuit, the embodiment of the present invention provides a kind of pixel circuit, the pixel circuit include write control unit,
Storage capacitance, driving tube, conducting control unit, Organic Light Emitting Diode；
Said write control unit includes output end, for the input terminal of external data input voltage signal and for external
The control terminal of scan control signal, the output end are grounded through the storage capacitance, are swept with what is received according to the control terminal
It retouches control signal level variation situation the data input voltage signal that the input terminal receives is written by the output end
Into the storage capacitance；
The first end that the output end is connected on the grid of the driving tube and the storage capacitance connects, the driving tube
The external anode voltage signal of source electrode, and according in the storage capacitance voltage signal and the anode voltage signal from described
The drain electrode outputting drive voltage signal of driving tube；
The conducting control unit includes first input end, the second input terminal, conducting control terminal and output end is connected, described
First input end is connect with the drain electrode of the driving tube, second input end grounding, the external reset letter of conducting control terminal
Number, the anode of the conducting output end and Organic Light Emitting Diode connects, the external cathode of cathode of the Organic Light Emitting Diode
Voltage signal, to keep the first input end and the conducting defeated according to the level change situation of the reset signal received
It is connected between outlet, or makes to be connected between second input terminal and the conducting output end.
Optionally, in embodiments of the present invention, above-mentioned conducting control unit includes first switch pipe and second switch pipe；
The source electrode of the first switch pipe is connect with the drain electrode of the driving tube, to pass through the source electrode of the first switch pipe
As the first input end；
The drain electrode of the first switch pipe is connect with the drain electrode of the second switch pipe, and to connect the first switch pipe
Drain electrode and the second switch pipe drain electrode the first connecting line on connecting node as the conducting output end；
The source electrode of the second switch pipe is grounded, using the source electrode by the second switch pipe as second input
End；
The grid of the first switch pipe is connect with the grid of the second switch pipe, and to connect the first switch pipe
Drain electrode and the second switch pipe drain electrode the second connecting line on connecting node as the conducting control terminal.
Optionally, in embodiments of the present invention, above-mentioned first switch pipe is p-type field-effect tube, and the second switch pipe is N
Type field-effect tube, the driving tube are N-type field-effect tube.
Optionally, in embodiments of the present invention, above-mentioned conducting control unit further includes high-resistance resistors；
The high-resistance resistors are arranged between the first switch pipe and the second switch pipe, the high-resistance resistors
One end connect with the drain electrode of the second switch pipe；
The other end of the high-resistance resistors is connect through first connecting line with the drain electrode of the first switch pipe, with
The Organic Light Emitting Diode is divided when being connected between second input terminal and the conducting output end.
Optionally, in embodiments of the present invention, above-mentioned conducting control unit further includes partial pressure pipe；
The source electrode of the partial pressure pipe is connect with the drain electrode of the second switch pipe, the grounded-grid of the partial pressure pipe, described
The drain electrode of partial pressure pipe is connect through first connecting line with the drain electrode of the first switch pipe, in second input terminal and institute
The Organic Light Emitting Diode is divided when stating conducting between output end is connected.
Optionally, in embodiments of the present invention, above-mentioned partial pressure pipe is p-type field-effect tube.
Optionally, in embodiments of the present invention, above-mentioned write control unit includes third switching tube；
The external data input voltage signal of source electrode of the third switching tube, and to pass through the third switching tube
Input terminal of the source electrode as said write control unit；
The external scan control signal of grid of the third switching tube, the drain electrode of the third switching tube are deposited with described
The first end connection that storing up electricity is held.
Optionally, in embodiments of the present invention, above-mentioned write control unit further includes the 4th switching tube；
The source electrode of 4th switching tube is connect with the drain electrode of the third switching tube, the drain electrode of the 4th switching tube with
The first end of the storage capacitance connects, so that the drain electrode of the third switching tube is through the 4th switching tube and storage electricity
Hold connection, and using the drain electrode of the 4th switching tube as the output end of said write control unit；
The grid of 4th switching tube is connect with the grid of the third switching tube, and to connect the 4th switching tube
Grid and the third switching tube grid third connecting line on control of the connecting node as said write control unit
End processed.
Optionally, in embodiments of the present invention, above-mentioned third switching tube is p-type field-effect tube, and the 4th switching tube is P
Type field-effect tube.
For device, the embodiment of the present invention provides a kind of display device, and the display device includes above-mentioned any one
The pixel circuit.
In terms of existing technologies, pixel circuit provided in an embodiment of the present invention and display device have below beneficial to effect
Fruit：The glow current control accuracy of the pixel circuit is high, can control organic hair according to the level change situation of reset signal
Optical diode shines or extinguishes whithin a period of time, to reduce average brightness of the display screen when low grayscale is shown, improves display
Screen display contrast and image display quality.The pixel circuit includes write control unit, storage capacitance, driving tube, leads
Logical control unit and Organic Light Emitting Diode.Said write control unit includes output end, believes for external data input voltage
Number input terminal and control terminal for external scan control signal, the output end is grounded through the storage capacitance, with basis
The data input voltage that the scan control signal level change situation that the control terminal receives receives the input terminal is believed
It number is written in the storage capacitance by the output end.On the grid of the driving tube and the storage capacitance described in connection
The first end of output end connects, the external anode voltage signal of source electrode of the driving tube, and according to the electricity in the storage capacitance
Press the drain electrode outputting drive voltage signal of signal and the anode voltage signal from the driving tube.The conducting control unit packet
Include first input end, the second input terminal, conducting control terminal and conducting output end, the leakage of the first input end and the driving tube
Pole connects, second input end grounding, the external reset signal of the conducting control terminal, the conducting output end and organic light emission
The anode of diode connects, the external cathode voltage signal of cathode of the Organic Light Emitting Diode, with according to described in receiving
The level change situation of reset signal makes to be connected between the first input end and the conducting output end, or makes described second defeated
Enter and be connected between end and the conducting output end, makes the Organic Light Emitting Diode in the drive voltage signal and the cathode
It shines under the action of potential difference between voltage signal, or so that the Organic Light Emitting Diode is connect in plus earth and cathode described
Extinguish in the case of cathode voltage signal, it is flat when low grayscale is shown using the display screen for having the pixel circuit to reduce
Equal brightness, improve display screen display contrast and image display quality.
To enable the above objects, features and advantages of the present invention to be clearer and more comprehensible, present pre-ferred embodiments cited below particularly,
And coordinate appended attached drawing, it is described in detail below.
Description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached
Figure is briefly described, it should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore is not construed as pair
The restriction of the claims in the present invention protection domain, for those of ordinary skill in the art, what is do not made the creative labor
Under the premise of, it can also be obtained according to these attached drawings other relevant attached drawings.
Fig. 1 is the first circuit composition schematic diagram of pixel circuit provided in an embodiment of the present invention.
Fig. 2 is second of circuit composition schematic diagram of pixel circuit provided in an embodiment of the present invention.
Fig. 3 is the third circuit composition schematic diagram of pixel circuit provided in an embodiment of the present invention.
Fig. 4 is the 4th kind of circuit composition schematic diagram of pixel circuit provided in an embodiment of the present invention.
Fig. 5 is the 5th kind of circuit composition schematic diagram of pixel circuit provided in an embodiment of the present invention.
Fig. 6 is the 6th kind of circuit composition schematic diagram of pixel circuit provided in an embodiment of the present invention.
Icon：100- pixel circuits；110- write control units；120- storage capacitances；130- driving tubes；140- conducting controls
Unit processed；150- Organic Light Emitting Diodes；141- first switch pipes；142- second switch pipes；The first connecting lines of 143-；144-
Two connecting lines；145- high-resistance resistors；146- partial pressure pipes；111- third switching tubes；The 4th switching tubes of 112-；113- thirds connect
Line.
Specific implementation mode
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.The present invention being usually described and illustrated herein in the accompanying drawings is implemented
The component of example can be arranged and be designed with a variety of different configurations.
Therefore, below the detailed description of the embodiment of the present invention to providing in the accompanying drawings be not intended to limit it is claimed
The scope of the present invention, but be merely representative of the present invention selected embodiment.Based on the embodiments of the present invention, this field is common
The every other embodiment that technical staff is obtained without creative efforts belongs to the model that the present invention protects
It encloses.
It should be noted that：Similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined, then it further need not be defined and explained in subsequent attached drawing in a attached drawing.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " setting ", " peace
Dress ", " connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integrally
Connection；It can be mechanical connection, can also be electrical connection；Can be directly connected, can also indirectly connected through an intermediary,
It can be the connection inside two elements.For the ordinary skill in the art, it can understand above-mentioned art with concrete condition
The concrete meaning of language in the present invention.In addition, term " first ", " second ", " third " etc. are only used for distinguishing description, and cannot manage
Solution is instruction or implies relative importance.
Below in conjunction with the accompanying drawings, it elaborates to some embodiments of the present invention.In the absence of conflict, following
Feature in embodiment and embodiment can be combined with each other.
Fig. 1 is please referred to, is the first circuit composition schematic diagram of pixel circuit 100 provided in an embodiment of the present invention.At this
In inventive embodiments, the pixel circuit 100 is high for the current control accuracy of Organic Light Emitting Diode (OLED), being capable of basis
The level change situation control of the external reset signal of the pixel circuit 100 shines or extinguishes whithin a period of time, to drop
Average brightness of the display screen when carrying out low grayscale display where the low pixel circuit 100, improves the aobvious of the display screen
Show contrast and image display quality.Wherein, the pixel circuit 100 includes write control unit 110, storage capacitance 120, drives
Dynamic pipe 130, conducting control unit 140 and Organic Light Emitting Diode 150.
In the present embodiment, said write control unit 110 includes input terminal IN, control terminal CO and output end OUT, described
The input terminal IN of write control unit 110 is used for external data input voltage signal Vdata, said write control unit 110
Control terminal CO is used for external scan control signal Vscan, and the output end OUT of said write control unit 110 is via the storage
Capacitance 120 is connect with ground terminal GND, the scan control for being received according to the control terminal CO of said write control unit 110
The data input voltage that the level change situation of signal Vscan receives the input terminal IN of said write control unit 110 is believed
Number Vdata is written in the storage capacitance 120, makes the storage capacitance 120 during the use of the pixel circuit 100
The data input voltage signal Vdata is kept.
In the present embodiment, said write control unit 110 can be according to the scan control signal Vscan in current time
The level state that point is shown judges whether to make to be connected between the input terminal IN of said write control unit 110 and output end OUT.
Optionally, if level state current the scan control signal Vscan is low level, said write control unit 110 will be
It is connected between the input terminal IN and the output end OUT so that the data input voltage signal Vdata is through described defeated
Enter to hold IN, the output end OUT, the storage capacitance 120 to be transferred to ground terminal GND, wherein the data input voltage signal
Corresponding voltage change data will be written in Vdata at the storage capacitance 120；If the scan control signal Vscan is current
Level state be high level, said write control unit 110 will be switched off between the input terminal IN and the output end OUT
Conducting, makes the data input voltage signal Vdata that can not be written in the storage capacitance 120, at this time the storage capacitance
The corresponding voltage change data of the data input voltage signal Vdata being written with itself are carried out voltage maintenance by 120.
In the present embodiment, the storage capacitance 120 includes first end and second end, and the first end is storage electricity
Hold the one end being connect with the output end OUT of said write control unit 110 on 120, the second end is the storage capacitance 120
On one end for directly being connect with ground terminal GND.
In the present embodiment, the driving tube 130 is a N-type field-effect tube, and the driving tube 130 described has for driving
Machine light emitting diode 150 shines.The grid of the driving tube 130 and connection said write control in the storage capacitance 120
The first end of the output end OUT of unit 110 processed connects, the external anode voltage signal Van of source electrode of the driving tube 130, with root
According in the storage capacitance 120 voltage signal and the anode voltage signal Van from the drain electrode of the driving tube 130 export drive
Dynamic voltage signal.
In the present embodiment, voltage value and level shape of the driving tube 130 in the drive voltage signal of drain electrode output
State, the source electrode reception of the data input voltage signal Vdata received with the grid of the driving tube 130, the driving tube 130
To anode voltage signal Van influence each other.If said write control unit 110 is not turned on, the storage capacitance 120 will lead to
It crosses the first end and persistently exports the data input voltage signal Vdata having been written into the driving tube 130, so that the driving
Pipe 130 is according to the potential difference values situation between source electrode and grid from drain electrode output for driving the Organic Light Emitting Diode 150
Luminous drive voltage signal.
In the present embodiment, the conducting control unit 140 is arranged in the driving tube 130 and the organic light-emitting diodes
Between pipe 150, and external reset signal Vreset, to control itself according to the level change situation of the reset signal Vreset
Conducting situation, to make the driving tube 130 that can or the drive voltage signal cannot be loaded into whithin a period of time
On the Organic Light Emitting Diode 150, the Organic Light Emitting Diode 150 is allowed to shine or extinguish within the period, to reduce
Average brightness of the corresponding display screen when low grayscale is shown, improve display screen display contrast and image display quality.
Wherein, the conducting control unit 140 includes first input end IN1, the second input terminal IN2, conducting control terminal CO
And conducting output end OUT.The first input end IN1 is connect with the drain electrode of the driving tube 130, the second input terminal IN2
It is connect with ground terminal GND, the external reset signal Vreset of conducting control terminal CO, the conducting output end OUT and institute
State the anode connection of Organic Light Emitting Diode 150, the external cathode voltage signal of cathode of the Organic Light Emitting Diode 150
Vcom, with according to the level change situation of the reset signal Vreset received make the first input end IN1 with it is described
It is connected between conducting output end OUT, or makes to be connected between the second input terminal IN2 and the conducting output end OUT, made described
Under the action of potential difference of the Organic Light Emitting Diode 150 between the drive voltage signal and the cathode voltage signal Vcom
It shines, or makes the Organic Light Emitting Diode 150 in the case where plus earth and cathode meet the cathode voltage signal Vcom
Extinguish.
Optionally, if level state current the reset signal Vreset is low level, the conducting control unit 140
It will be connected between the first input end IN1 and the conducting output end OUT, make the anode voltage signal Van, the drive
It is dynamic to form access between pipe 130, the Organic Light Emitting Diode 150 and the cathode voltage signal Vcom, it is ensured that described organic
Light emitting diode 150 is obtained in the cathode voltage signal Vcom and by the anode voltage signal Van through the driving tube 130
Drive voltage signal under the action of shine.
Optionally, if level state current the reset signal Vreset is high level, the conducting control unit 140
It will be connected between the second input terminal IN2 and the conducting output end OUT, make the sun of the Organic Light Emitting Diode 150
It is extremely directly connect with ground terminal GND, the cathode of the Organic Light Emitting Diode 150 is kept with the cathode voltage signal Vcom's
Connection status, so that between ground terminal GND present on the Organic Light Emitting Diode 150 and cathode voltage signal Vcom
Potential difference be not enough to allow the Organic Light Emitting Diode 150 to shine, i.e., the described Organic Light Emitting Diode 150 extinguishes.
In the present embodiment, the pixel circuit 100 is when corresponding display screen carries out low gray-scale intensity display, by " inserting
It is black " mode alternately adjustment Organic Light Emitting Diode 150 shone or extinguishes within the display period, reduce the display screen aobvious
Show the average brightness in the period, improve the display screen display contrast and image display quality.
Fig. 2 is please referred to, is second of circuit composition schematic diagram of pixel circuit 100 provided in an embodiment of the present invention.At this
In inventive embodiments, said write control unit 110 can only include third switching tube 111, and said write control unit 110 is logical
Cross the function that the third switching tube 111 realizes the above write control unit 110.
In the present embodiment, the third switching tube 111 is a p-type field-effect tube.The source electrode of the third switching tube 111
The external data input voltage signal Vdata, using the source electrode of the third switching tube 111 as said write control unit
110 input terminal IN；The external scan control signal Vscan of grid of the third switching tube 111, the third is opened
Close control terminal CO of the grid of pipe 111 as said write control unit 110；The drain electrode of the third switching tube 111 directly with
The first end of the storage capacitance 120 connects, using the drain electrode of the third switching tube 111 as said write control unit
110 output end OUT.Wherein, the third switching tube 111 is low electricity in the level state of the scan control signal Vscan
Conducts, to be connected to the data input voltage signal Vdata and the storage capacitance 120.
Fig. 3 is please referred to, is the third circuit composition schematic diagram of pixel circuit 100 provided in an embodiment of the present invention.At this
In inventive embodiments, said write control unit 110 can also include described outside including above-mentioned third switching tube 111
Four switching tubes 112, said write control unit 110 pass through between the third switching tube 111 and the 4th switching tube 112
Joint realizes the function of the above write control unit 110.
In the present embodiment, the 4th switching tube 112 is also a p-type field-effect tube.The source of the third switching tube 111
The extremely external data input voltage signal Vdata is controlled single using the source electrode of the third switching tube 111 as said write
The input terminal IN of member 110；The source electrode of 4th switching tube 112 is connect with the drain electrode of the third switching tube 111, and the described 4th
The drain electrode of switching tube 112 is connect with the first end of the storage capacitance 120, so that the drain electrode of the third switching tube 111 is through institute
It states the 4th switching tube 112 to connect with the storage capacitance 120, and using the drain electrode of the 4th switching tube 112 as said write
The output end OUT of control unit 110；The grid of 4th switching tube 112 and the grid of the third switching tube 111 pass through the
Three connecting lines 113 connect, and to connect the institute of the grid of the 4th switching tube 112 and the grid of the third switching tube 111
Control terminal CO of the connecting node on third connecting line 113 as said write control unit 110 is stated, at this time the 4th switch
The external scan control signal Vscan of the grid of the grid of pipe 112 and the third switching tube 111.
Wherein, the third switching tube 111 is reduced by the connection type of double-gate structure with the 4th switching tube 112 and is leaked
The level of the generation of electric current, the third switching tube 111 and the 4th switching tube 112 in the scan control signal Vscan
State is both turned on when being low level, to be connected to the data input voltage signal Vdata and the storage capacitance 120.
Fig. 4 is please referred to, is the 4th kind of circuit composition schematic diagram of pixel circuit 100 provided in an embodiment of the present invention.At this
In inventive embodiments, the conducting control unit 140 includes first switch pipe 141 and second switch pipe 142, the conducting control
Unit 140 realizes the above conducting control unit by the first switch pipe 141 and the second switch pipe 142
140 conducting control function.
In the present embodiment, the first switch pipe 141 is p-type field-effect tube, and the second switch pipe 142 is N-type field
Effect pipe.The source electrode of the first switch pipe 141 is connect with the drain electrode of the driving tube 130, to pass through the first switch pipe
First input end IN1 of 141 source electrode as the conducting control unit 140；The drain electrode of the first switch pipe 141 with it is described
Second switch pipe 142 is connected by the first connecting line 143, and to connect the drain electrode and described second of the first switch pipe 141
Connecting node on first connecting line 143 of the drain electrode of switching tube 142 is defeated as the conducting of the conducting control unit 140
Outlet OUT；The source electrode of the second switch pipe 142 is connect with ground terminal GND, to pass through the source electrode of the second switch pipe 142
The second input terminal IN2 as the conducting control unit 140；The grid of the first switch pipe 141 and the second switch
The grid of pipe 142 is connected by the second connecting line 144, and is opened with the drain electrode and described second that connect the first switch pipe 141
Close conducting control of the connecting node as the conducting control unit 140 on second connecting line 144 of the drain electrode of pipe 142
Hold CO.
Wherein, if the level state for the reset signal Vreset that the connecting node on second connecting line 144 is connected
For low level, the then conducting of first switch pipe 141, the disconnection of second switch pipe 142, the first input end IN1 and institute
Corresponding conducting, the Organic Light Emitting Diode 150 between output end OUT is connected is stated to shine；If on second connecting line 144
The level state for the reset signal Vreset that connecting node is connected is high level, then the first switch pipe 141 disconnects, described
Second switch pipe 142 is connected, corresponding conducting, organic hair between the second input terminal IN2 and the conducting output end OUT
Optical diode 150 extinguishes.
Fig. 5 is please referred to, is the 5th kind of circuit composition schematic diagram of pixel circuit 100 provided in an embodiment of the present invention.At this
In inventive embodiments, the conducting control unit 140 is in addition to including the first switch pipe 141 and the second switch pipe 142
Outside, it can also include high-resistance resistors 145, the high-resistance resistors 145 are used for described in the first switch pipe 141 disconnection
When second switch pipe 142 is connected, voltage division processing is carried out to the Organic Light Emitting Diode 150, to prevent the organic light emission two
Pole pipe 150 shines under the action of corresponding potential difference.
In the present embodiment, the high-resistance resistors 145 are arranged in the first switch pipe 141 and the second switch pipe
Between 142.One end of the high-resistance resistors 145 is connect with the drain electrode of the second switch pipe 142, the high-resistance resistors
145 other end is connect through first connecting line 143 with the drain electrode of the first switch pipe 141, in second input
The Organic Light Emitting Diode 150 is divided when being connected between the IN2 and conducting output end OUT of end.Described at this time
The setting of one connecting line 143 connects between the first switch pipe 141 and the high-resistance resistors 145, and by described first
Connecting node on line 143 is as the conducting output end OUT.
Fig. 6 is please referred to, is the 6th kind of circuit composition schematic diagram of pixel circuit 100 provided in an embodiment of the present invention.At this
In inventive embodiments, the conducting control unit 140 is in addition to including the first switch pipe 141 and the second switch pipe 142
Outside, it can also include partial pressure pipe 146.The partial pressure pipe 146 is similar with the high-resistance resistors 145, for being opened described first
Close pipe 141 disconnect and the second switch pipe 142 be connected when, to the Organic Light Emitting Diode 150 carry out voltage division processing, to prevent
Only the Organic Light Emitting Diode 150 shines under the action of corresponding potential difference.
In the present embodiment, the partial pressure pipe 146 is p-type field-effect tube.The source electrode and described second of the partial pressure pipe 146
The drain electrode of switching tube 142 connects；The grid of the partial pressure pipe 146 is connect with ground terminal GND；The drain electrode warp of the partial pressure pipe 146
First connecting line 143 is connect with the drain electrode of the first switch pipe 141, to be led with described in the second input terminal IN2
The Organic Light Emitting Diode 150 is divided when being connected between logical output end OUT.First connecting line 143 is set at this time
It sets between the drain electrode and the drain electrode of the partial pressure pipe 146 of the first switch pipe 141, and passes through first connecting line 143
On connecting node as the conducting output end OUT.
The embodiment of the present invention also provides a kind of display device, and the display device includes as shown in figs 1 to 6 any one
The pixel circuit 100 of kind, the display device control Organic Light Emitting Diode 150 one by the pixel circuit 100
It shines or extinguishes in the section time, to reduce the average brightness of display screen that the display device includes when low grayscale is shown, carry
High display screen display contrast and image display quality.
In conclusion in pixel circuit provided in an embodiment of the present invention and display device, the pixel circuit shines
Current control accuracy is high, can control Organic Light Emitting Diode according to the level change situation of reset signal and send out whithin a period of time
Light or extinguishing, to reduce average brightness of the display screen when low grayscale is shown, improve display screen display contrast and picture is aobvious
Show quality.The pixel circuit includes write control unit, storage capacitance, driving tube, conducting control unit and organic light emission two
Pole pipe.Said write control unit includes output end, is swept for the input terminal of external data input voltage signal and for external
The control terminal of control signal is retouched, the output end is grounded through the storage capacitance, with the scanning received according to the control terminal
The data input voltage signal that the input terminal receives is written to by control signal level variation situation by the output end
In the storage capacitance.The first end that the output end is connected on the grid of the driving tube and the storage capacitance connects, institute
The external anode voltage signal of source electrode of driving tube is stated, and according to the voltage signal and anode voltage letter in the storage capacitance
Number from the drain electrode outputting drive voltage signal of the driving tube.The conducting control unit includes first input end, the second input
End, conducting control terminal and conducting output end, the first input end are connect with the drain electrode of the driving tube, second input terminal
The anode of ground connection, the external reset signal of the conducting control terminal, the conducting output end and Organic Light Emitting Diode connects, described
The external cathode voltage signal of cathode of Organic Light Emitting Diode, with according to the level change situation of the reset signal received
Make to be connected between the first input end and the conducting output end, or make second input terminal and the conducting output end it
Between be connected, make potential difference of the Organic Light Emitting Diode between the drive voltage signal and the cathode voltage signal
Effect is lower to shine, or the Organic Light Emitting Diode is made to be put out in the case where plus earth and cathode connect the cathode voltage signal
It goes out, to reduce the average brightness using the display screen for having the pixel circuit when low grayscale is shown, improves the aobvious of display screen
Show contrast and image display quality.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, any made by repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of pixel circuit, which is characterized in that the pixel circuit includes write control unit, storage capacitance, driving tube, leads
Logical control unit, Organic Light Emitting Diode；
Said write control unit includes output end, for the input terminal of external data input voltage signal and for external scanning
The control terminal of signal is controlled, the output end is grounded through the storage capacitance, with the scanning control received according to the control terminal
The data input voltage signal that the input terminal receives is written to institute by signal level variation situation processed by the output end
It states in storage capacitance；
The first end that the output end is connected on the grid of the driving tube and the storage capacitance connects, the source of the driving tube
Extremely external anode voltage signal, and according in the storage capacitance voltage signal and the anode voltage signal from the driving
The drain electrode outputting drive voltage signal of pipe；
The conducting control unit includes first input end, the second input terminal, conducting control terminal and output end is connected, and described first
Input terminal is connect with the drain electrode of the driving tube, second input end grounding, the external reset signal of the conducting control terminal, institute
The anode for stating conducting output end and Organic Light Emitting Diode connects, the external cathode voltage letter of cathode of the Organic Light Emitting Diode
Number, with according to the level change situation of the reset signal received make the first input end and the conducting output end it
Between be connected, or make to be connected between second input terminal and the conducting output end.
2. pixel circuit according to claim 1, which is characterized in that the conducting control unit include first switch pipe and
Second switch pipe；
The source electrode of the first switch pipe is connect with the drain electrode of the driving tube, using the source electrode by the first switch pipe as
The first input end；
The drain electrode of the first switch pipe is connect with the drain electrode of the second switch pipe, and to connect the leakage of the first switch pipe
Connecting node on first connecting line of the drain electrode of pole and the second switch pipe is as the conducting output end；
The source electrode of the second switch pipe is grounded, using the source electrode by the second switch pipe as second input terminal；
The grid of the first switch pipe is connect with the grid of the second switch pipe, and to connect the leakage of the first switch pipe
Connecting node on second connecting line of the drain electrode of pole and the second switch pipe is as the conducting control terminal.
3. pixel circuit according to claim 2, which is characterized in that the first switch pipe is p-type field-effect tube, described
Second switch pipe is N-type field-effect tube, and the driving tube is N-type field-effect tube.
4. pixel circuit according to claim 3, which is characterized in that the conducting control unit further includes high-impedance state electricity
Resistance；
The high-resistance resistors are arranged between the first switch pipe and the second switch pipe, and the one of the high-resistance resistors
End is connect with the drain electrode of the second switch pipe；
The other end of the high-resistance resistors is connect through first connecting line with the drain electrode of the first switch pipe, with described
The Organic Light Emitting Diode is divided when being connected between the second input terminal and the conducting output end.
5. pixel circuit according to claim 3, which is characterized in that the conducting control unit further includes partial pressure pipe；
The source electrode of the partial pressure pipe is connect with the drain electrode of the second switch pipe, the grounded-grid of the partial pressure pipe, the partial pressure
The drain electrode of pipe is connect through first connecting line with the drain electrode of the first switch pipe, to be led with described in second input terminal
The Organic Light Emitting Diode is divided when being connected between logical output end.
6. pixel circuit according to claim 5, which is characterized in that the partial pressure pipe is p-type field-effect tube.
7. according to the pixel circuit described in any one of claim 1-6, which is characterized in that said write control unit includes
Third switching tube；
The external data input voltage signal of source electrode of the third switching tube, and to pass through the source electrode of the third switching tube
Input terminal as said write control unit；
The external scan control signal of grid of the third switching tube, the drain electrode of the third switching tube and storage electricity
The first end of appearance connects.
8. pixel circuit according to claim 7, which is characterized in that said write control unit further includes the 4th switch
Pipe；
The source electrode of 4th switching tube is connect with the drain electrode of the third switching tube, the drain electrode of the 4th switching tube with it is described
The first end of storage capacitance connects, so that the drain electrode of the third switching tube connects through the 4th switching tube and the storage capacitance
It connects, and using the drain electrode of the 4th switching tube as the output end of said write control unit；
The grid of 4th switching tube is connect with the grid of the third switching tube, and to connect the grid of the 4th switching tube
Control terminal of the connecting node as said write control unit on the third connecting line of the grid of pole and the third switching tube.
9. pixel circuit according to claim 8, which is characterized in that the third switching tube is p-type field-effect tube, described
4th switching tube is p-type field-effect tube.
10. a kind of display device, which is characterized in that the display device includes the picture described in any one of claim 1-9
Plain circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810391783.9A CN108320712A (en) | 2018-04-27 | 2018-04-27 | Pixel circuit and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810391783.9A CN108320712A (en) | 2018-04-27 | 2018-04-27 | Pixel circuit and display device |
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| CN108320712A true CN108320712A (en) | 2018-07-24 |
Family
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810391783.9A Withdrawn CN108320712A (en) | 2018-04-27 | 2018-04-27 | Pixel circuit and display device |
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| CN (1) | CN108320712A (en) |
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| CN114360437A (en) * | 2020-09-29 | 2022-04-15 | 京东方科技集团股份有限公司 | A display device, display control method and device, and storage medium |
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