CN110428780A - A kind of OLED internal compensation circuit - Google Patents
A kind of OLED internal compensation circuit Download PDFInfo
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- CN110428780A CN110428780A CN201910572646.XA CN201910572646A CN110428780A CN 110428780 A CN110428780 A CN 110428780A CN 201910572646 A CN201910572646 A CN 201910572646A CN 110428780 A CN110428780 A CN 110428780A
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- transistor
- voltage
- compensation circuit
- scanning signal
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
- G09G3/3233—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
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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 El Displays (AREA)
Abstract
The present invention relates to microelectronics technology, in particular to a kind of OLED internal compensation circuit, including the identical effective display unit of more than two circuit structures and peripheral cell；The threshold voltage of TFT can be compensated, so that the picture brightness of panel everywhere is more uniform, and then improve the accuracy of Display panel picture.And the diode current of compensation circuit of the invention is not influenced by supply voltage and power cathode voltage, and it is only related with data voltage and resetting voltage, it is able to solve the drifting problem of threshold voltage, while also can solve OLED life deterioration problem；By the way that the source electrode of the 5th transistor of peripheral cell is connect resetting voltage, so that the sub-pix of same a line in panel effective display area domain need to only use a transistor controls resetting voltage, the area occupied of each pixel can be saved, make that more pixels can be accommodated in unit area, and then improves the picture element density of panel.
Description
Technical field
The present invention relates to microelectronics technology, in particular to a kind of OLED internal compensation circuit.
Background technique
Organic Light Emitting Diode (Organic Light-Emitting Diode, be abbreviated as OLED), due to by processing procedure and
The influence of the problems such as aging, the threshold of the thin film transistor (TFT) (Thin Film Transistor, be abbreviated as TFT) in each pixel
Threshold voltage can not be identical, and inputting electric current caused by the voltage of identical numerical value can be variant, and it is uneven to will lead to panel luminance；And
And panel resolution is limited to the size of pixel, if the bigger resolution that will reduce panel of pixel design, will affect panel
The display quality of picture.
Therefore, it is necessary to which the uniform internal compensation circuit of the picture brightness of panel can be made by providing one kind.
Summary of the invention
The technical problems to be solved by the present invention are: providing a kind of can make inside the uniform OLED of the picture brightness of panel
Compensation circuit.
In order to solve the above-mentioned technical problem, the scheme that the present invention uses are as follows:
A kind of OLED internal compensation circuit, including the identical effective display unit of more than two circuit structures and periphery list
Member；
Effective display unit includes the first transistor, second transistor, third transistor, the 4th transistor, first
Capacitor and diode, the grid of the first transistor are electrically connected with the first scanning signal of peripheral hardware, the first transistor
Source electrode connects data voltage, and the drain electrode of the first transistor is electric with the drain electrode of the grid of second transistor and third transistor respectively
Connection, the drain electrode of the second transistor connect supply voltage, the anode electricity of the source electrode of the second transistor and the diode
Connection, the grid of the third transistor be electrically connected with the grid of the 4th transistor, and the grid of third transistor with outside
If the electrical connection of the second scanning signal, the source electrode of the third transistor is electrically connected with one end of the first capacitor, described the
The other end of one capacitor is electrically connected with the drain electrode of the cathode of the diode and the 4th transistor respectively, the 4th transistor
Source electrode ground connection；
The peripheral cell includes the 5th transistor, the grid of the 5th transistor and the third scanning signal electricity of peripheral hardware
Connection, the drain electrode of the 5th transistor are electrically connected with one end of the source electrode of the third transistor and first capacitor respectively, institute
The source electrode for stating the 5th transistor connects resetting voltage.
The beneficial effects of the present invention are:
The internal compensation circuit designed through the invention can compensate the threshold voltage of TFT, so that panel is everywhere
Picture brightness it is more uniform, and then improve Display panel picture accuracy.And the diode electricity of compensation circuit of the invention
Stream is not influenced by supply voltage and power cathode voltage, only related with data voltage and resetting voltage, is able to solve threshold value electricity
The drifting problem of pressure, while also can solve OLED life deterioration problem；By the way that the source electrode of the 5th transistor of peripheral cell is connect
Resetting voltage, so that the sub-pix of same a line in panel effective display area domain need to only use a transistor controls resetting voltage,
The area occupied that each pixel can be saved makes that more pixels can be accommodated in unit area, and then the picture element for improving panel is close
Degree.
Detailed description of the invention
Fig. 1 is a kind of circuit diagram of OLED internal compensation circuit according to the present invention；
Label declaration:
1, effective display unit；2, peripheral cell；T1, the first transistor；T2, second transistor；
T3, third transistor；T4, the 4th transistor；T5, the 5th transistor；C1, first capacitor；D1, diode；
Scan1, the first scanning signal；Scan2, the second scanning signal；Scan3, third scanning signal；VDD, supply voltage；Vdata,
Data voltage；Vreset, resetting voltage；A, first node；G, second node；S, third node.
Specific embodiment
To explain the technical content, the achieved purpose and the effect of the present invention in detail, below in conjunction with embodiment and cooperate attached
Figure is explained.
The most critical design of the present invention is: by the way that the first of the first transistor of internal compensation circuit and peripheral hardware is scanned
Signal electrical connection, third transistor are electrically connected with the second scanning signal of peripheral hardware, and the third of the 5th transistor and peripheral hardware scans letter
Number electrical connection, eliminates the defects of panel luminance is uneven and image display effect is poor with this.
Fig. 1 is please referred to, technical solution provided by the invention:
A kind of OLED internal compensation circuit, including the identical effective display unit of more than two circuit structures and periphery list
Member；
Effective display unit includes the first transistor, second transistor, third transistor, the 4th transistor, first
Capacitor and diode, the grid of the first transistor are electrically connected with the first scanning signal of peripheral hardware, the first transistor
Source electrode connects data voltage, and the drain electrode of the first transistor is electric with the drain electrode of the grid of second transistor and third transistor respectively
Connection, the drain electrode of the second transistor connect supply voltage, the anode electricity of the source electrode of the second transistor and the diode
Connection, the grid of the third transistor be electrically connected with the grid of the 4th transistor, and the grid of third transistor with outside
If the electrical connection of the second scanning signal, the source electrode of the third transistor is electrically connected with one end of the first capacitor, described the
The other end of one capacitor is electrically connected with the drain electrode of the cathode of the diode and the 4th transistor respectively, the 4th transistor
Source electrode ground connection；
The peripheral cell includes the 5th transistor, the grid of the 5th transistor and the third scanning signal electricity of peripheral hardware
Connection, the drain electrode of the 5th transistor are electrically connected with one end of the source electrode of the third transistor and first capacitor respectively, institute
The source electrode for stating the 5th transistor connects resetting voltage.
As can be seen from the above description, the beneficial effects of the present invention are:
The internal compensation circuit designed through the invention can compensate the threshold voltage of TFT, so that panel is everywhere
Picture brightness it is more uniform, and then improve Display panel picture accuracy.And the diode electricity of compensation circuit of the invention
Stream is not influenced by supply voltage and power cathode voltage, only related with data voltage and resetting voltage, is able to solve threshold value electricity
The drifting problem of pressure, while also can solve OLED life deterioration problem；By the way that the source electrode of the 5th transistor of peripheral cell is connect
Resetting voltage, so that the sub-pix of same a line in panel effective display area domain need to only use a transistor controls resetting voltage,
The area occupied that each pixel can be saved makes that more pixels can be accommodated in unit area, and then the picture element for improving panel is close
Degree.
Further, first scanning signal is high voltage signal, and second scanning signal is low voltage signal, institute
Stating third scanning signal is high voltage signal.
Seen from the above description, the first scanning signal high input voltage, the first transistor conducting, the input of the second scanning signal
Low-voltage, third transistor cut-off, the first scanning signal high input voltage, the 5th transistor turns, so that compensation circuit is in
Compensated stage can compensate for threshold voltage, so that the picture brightness of panel everywhere is more uniform.
Further, first scanning signal is low voltage signal, and second scanning signal is high voltage signal, institute
Stating third scanning signal is low voltage signal.
Seen from the above description, the first scanning signal inputs low-voltage, the first transistor cut-off, the input of the second scanning signal
High voltage, third transistor conducting, the first scanning signal input low-voltage, the 5th transistor cutoff, so that compensation circuit is in
Light emitting phase is able to solve the drifting problem of threshold voltage, while also can solve OLED life deterioration problem, considerably increases two
The stability of pole pipe electric current.
Further, effective display unit is a sub-pixel.
Further, the first transistor to the 5th transistor is double-gate film transistor.
Seen from the above description, the device architecture stability of double-gate film transistor is high, can effectively improve device
Electrically.
Further, the diode is Organic Light Emitting Diode.
As can be seen from the above description, the thickness of Organic Light Emitting Diode is thin, light-weight, anti-seismic performance is more preferable, not fear of throwing；Visually
Angle is big, even if watching under very big visual angle, picture is still undistorted；And the response time is short, manufacturing process is simple, cost
Low, luminous efficiency is higher, can manufacture on the substrate of unlike material, and can be made can curved soft display device.
Further, the Organic Light Emitting Diode include glass substrate, transparency conducting layer, hole transmission layer, luminescent layer,
Electron transfer layer and cathode metal layer, the transparency conducting layer, hole transmission layer, luminescent layer, electron transfer layer and cathodic metal
Layer is successively set on glass baseplate surface.
Please refer to Fig. 1, the embodiment of the present invention one are as follows:
A kind of OLED internal compensation circuit, including the identical effective display unit 1 of more than two circuit structures and periphery list
Member 2；
Effective display unit 1 includes the first transistor T1, second transistor T2, third transistor T3, the 4th crystal
First scanning signal Scan1 of the grid and peripheral hardware of pipe T4, first capacitor C1 and diode D1, the first transistor T1 is electrically connected
Connect, the source electrode of the first transistor T1 meets data voltage Vdata, the drain electrode of the first transistor T1 respectively with the second crystal
The drain electrode electrical connection of the grid and third transistor T3 of pipe T2, the drain electrode of the second transistor T2 meets supply voltage VDD, described
The source electrode of second transistor T2 is electrically connected with the anode of the diode D1, the grid of the third transistor T3 and the described 4th
The grid of transistor T4 is electrically connected, and the grid of third transistor T3 is electrically connected with the second scanning signal Scan2 of peripheral hardware, described
The source electrode of third transistor T3 is electrically connected with one end of the first capacitor C1, the other end of the first capacitor C1 respectively with institute
State the drain electrode electrical connection of the cathode and the 4th transistor T4 of diode D1, the source electrode ground connection of the 4th transistor T4.
The peripheral cell 2 includes the 5th transistor T5, and the grid of the 5th transistor T5 and the third of peripheral hardware scan
Signal Scan3 electrical connection, the source electrode and first capacitor with the third transistor T3 respectively that drain of the 5th transistor T5
One end of C1 is electrically connected, and the source electrode of the 5th transistor T5 meets resetting voltage Vreset.
One effective display unit 1 is a sub-pixel, and three effective display units 1 constitute a pixel.
The first transistor T1 to the 5th transistor T5 is double-gate film transistor.
The diode D1 is Organic Light Emitting Diode, and the Organic Light Emitting Diode includes glass substrate, electrically conducting transparent
Layer, hole transmission layer, luminescent layer, electron transfer layer and cathode metal layer, the transparency conducting layer, hole transmission layer, luminescent layer,
Electron transfer layer and cathode metal layer are successively set on glass baseplate surface.
The first scanning signal Scan1 is high voltage signal, and the second scanning signal Scan2 is low voltage signal,
The third scanning signal Scan3 is high voltage signal；
Compensation circuit is in compensated stage at this time, and the first transistor T1 is in the conductive state, and third transistor T3, which is in, to be cut
Only state, the 5th transistor T5 are in the conductive state；
VG=Vdata；
VS=Vdata-Vth；
VSS=Vdata-Vth-VOLED；
VA=Vreset；
VC1=Vreset-(Vdata-Vth-VOLED)；
Wherein, VAFor the voltage of first node A, VGFor the voltage of second node G, VSFor the voltage of third node S, Vdata
For data voltage, VthFor threshold voltage, VOLEDFor Organic Light Emitting Diode voltage, VresetFor resetting voltage.
Please refer to Fig. 1, the embodiment of the present invention two are as follows:
The first scanning signal Scan1 is low voltage signal, and the second scanning signal Scan2 is high voltage signal,
The third scanning signal Scan3 is low voltage signal；
Compensation circuit is in light emitting phase at this time, and the first transistor T1 is in off state, and third transistor T3 is in and leads
Logical state, the 5th transistor T5 are in off state；
VSS=0；
VG=Vreset-Vdata+Vth+VOLED；
VS=VOLED；
According to saturation region current formula IOLED=1/2 μn*COX*W/L(VGS-Vth)2It can obtain,
IOLED=1/2 μn*COX*W/L(Vreset-Vdata)2；
Wherein, VGFor the voltage of second node G, VSFor the voltage of third node S, VSSFor power cathode voltage, VresetFor
Resetting voltage, VdataFor data voltage, VthFor threshold voltage, VOLEDFor Organic Light Emitting Diode voltage, VGSFor driving voltage, μn
For field-effect mobility, COXFor the capacitive dielectric layer of unit area, W/L is TFT channel width and length ratio.
From the above-mentioned available I of saturation region current formulaOLEDOnly and VresetAnd VdataIt is related, with VthIt is unrelated, i.e., it is organic
The electric current of light emitting diode is only related with resetting voltage and data voltage, unrelated with threshold voltage, and the pixel compensation of this programme
Circuit has solved the drifting problem of threshold voltage, while also solving the problems, such as OLED life deterioration, to reach this programme
The purpose of design.
In conclusion a kind of OLED internal compensation circuit provided by the invention, the internal compensation electricity designed through the invention
Road can compensate the threshold voltage of TFT, so that the picture brightness of panel everywhere is more uniform, and then it is aobvious to improve panel
Show the accuracy of picture.And the diode current of compensation circuit of the invention is not by the shadow of supply voltage and power cathode voltage
It rings, it is only related with data voltage and resetting voltage, it is able to solve the drifting problem of threshold voltage, while also can solve the OLED service life
Degenerate problem；By the way that the source electrode of the 5th transistor of peripheral cell is connect resetting voltage, so that in panel effective display area domain
Sub-pix with a line need to only use a transistor controls resetting voltage, can save the area occupied of each pixel, make unit
More pixels can be accommodated in area, and then improve the picture element density of panel.
The above description is only an embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalents made by bright specification and accompanying drawing content are applied directly or indirectly in relevant technical field, similarly include
In scope of patent protection of the invention.
Claims (7)
1. a kind of OLED internal compensation circuit, which is characterized in that including the identical effective display unit of more than two circuit structures
And peripheral cell；
Effective display unit includes the first transistor, second transistor, third transistor, the 4th transistor, first capacitor
And diode, the grid of the first transistor are electrically connected with the first scanning signal of peripheral hardware, the source electrode of the first transistor
Data voltage is connect, drain electrode of the drain electrode of the first transistor respectively with the grid of second transistor and third transistor is electrically connected
It connects, the drain electrode of the second transistor connects supply voltage, and the source electrode of the second transistor and the anode of the diode are electrically connected
It connects, the grid of the third transistor is electrically connected with the grid of the 4th transistor, and the grid and peripheral hardware of third transistor
The electrical connection of the second scanning signal, the source electrode of the third transistor is electrically connected with one end of the first capacitor, described first
The other end of capacitor is electrically connected with the drain electrode of the cathode of the diode and the 4th transistor respectively, the source of the 4th transistor
Pole ground connection；
The peripheral cell includes the 5th transistor, and the grid of the 5th transistor and the third scanning signal of peripheral hardware are electrically connected
It connects, the drain electrode of the 5th transistor is electrically connected with one end of the source electrode of the third transistor and first capacitor respectively, described
The source electrode of 5th transistor connects resetting voltage.
2. OLED internal compensation circuit according to claim 1, which is characterized in that first scanning signal is high voltage
Signal, second scanning signal are low voltage signal, and the third scanning signal is high voltage signal.
3. OLED internal compensation circuit according to claim 1, which is characterized in that first scanning signal is low-voltage
Signal, second scanning signal are high voltage signal, and the third scanning signal is low voltage signal.
4. OLED internal compensation circuit according to claim 1, which is characterized in that effective display unit is one
A sub-pixel.
5. OLED internal compensation circuit according to claim 1, which is characterized in that the first transistor is equal to the 5th transistor
For double-gate film transistor.
6. OLED internal compensation circuit according to claim 1, which is characterized in that the diode is organic light-emitting diodes
Pipe.
7. OLED internal compensation circuit according to claim 1, which is characterized in that the Organic Light Emitting Diode includes glass
Glass substrate, transparency conducting layer, hole transmission layer, luminescent layer, electron transfer layer and cathode metal layer, the transparency conducting layer, sky
Cave transport layer, luminescent layer, electron transfer layer and cathode metal layer are successively set on glass baseplate surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910572646.XA CN110428780A (en) | 2019-06-28 | 2019-06-28 | A kind of OLED internal compensation circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910572646.XA CN110428780A (en) | 2019-06-28 | 2019-06-28 | A kind of OLED internal compensation circuit |
Publications (1)
| Publication Number | Publication Date |
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| CN110428780A true CN110428780A (en) | 2019-11-08 |
Family
ID=68409847
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| CN201910572646.XA Withdrawn CN110428780A (en) | 2019-06-28 | 2019-06-28 | A kind of OLED internal compensation circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111883061A (en) * | 2020-07-31 | 2020-11-03 | 维沃移动通信有限公司 | Pixel circuit, display device, electronic apparatus, and method for driving pixel circuit |
| WO2021143752A1 (en) * | 2020-01-16 | 2021-07-22 | 京东方科技集团股份有限公司 | Display panel, pixel circuit, and drive method thereof |
-
2019
- 2019-06-28 CN CN201910572646.XA patent/CN110428780A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021143752A1 (en) * | 2020-01-16 | 2021-07-22 | 京东方科技集团股份有限公司 | Display panel, pixel circuit, and drive method thereof |
| US11908404B2 (en) | 2020-01-16 | 2024-02-20 | Boe Technology Group Co., Ltd. | Display panel, pixel circuit and method for driving the pixel circuit |
| CN111883061A (en) * | 2020-07-31 | 2020-11-03 | 维沃移动通信有限公司 | Pixel circuit, display device, electronic apparatus, and method for driving pixel circuit |
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Application publication date: 20191108 |
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