CN106910465A - Luminous display unit - Google Patents
Luminous display unit Download PDFInfo
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- CN106910465A CN106910465A CN201710104350.6A CN201710104350A CN106910465A CN 106910465 A CN106910465 A CN 106910465A CN 201710104350 A CN201710104350 A CN 201710104350A CN 106910465 A CN106910465 A CN 106910465A
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- 238000003860 storage Methods 0.000 claims abstract description 34
- 230000005611 electricity Effects 0.000 claims description 17
- 239000000126 substance Substances 0.000 claims description 3
- 238000003491 array Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 description 8
- 210000004027 cell Anatomy 0.000 description 7
- 230000006641 stabilisation Effects 0.000 description 7
- 238000011105 stabilization Methods 0.000 description 7
- 230000003287 optical effect Effects 0.000 description 4
- 239000013078 crystal Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004020 luminiscence type Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 239000011800 void material Substances 0.000 description 2
- 206010068052 Mosaicism Diseases 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
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- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 210000003765 sex chromosome Anatomy 0.000 description 1
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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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- Theoretical Computer Science (AREA)
- Electroluminescent Light Sources (AREA)
- Control Of El Displays (AREA)
Abstract
The present invention relates to a kind of luminous display unit, including：Image element circuit, operational amplifier and data wire, image element circuit include storage capacitance Cst, transistor DTFT and electroluminescent device, storage capacitance CstFirst end be used for be connected with the first power supply, storage capacitance CstThe second end be connected with the grid of transistor DTFT, the drain electrode of transistor DTFT is connected with the positive pole of electroluminescent device, the grid of transistor DTFT and the output end of operational amplifier, the positive pole of electroluminescent device and the normal phase input end of operational amplifier, the inverting input of operational amplifier are connected with data wire.The voltage amplified by operational amplifier is storage capacitance CstCharge so that storage capacitance CstBeing capable of quick charge so that electroluminescent device lights so that data wire only needs to provide corresponding operating voltage according to the operating current of electroluminescent device, you can realize that electroluminescent device realizes the luminous of each GTG.
Description
Technical field
The present invention relates to luminescence display technical field, more particularly to luminous display unit.
Background technology
In order to solve the space of TFT in existing process oled panel (Thin Film Transistor, thin film transistor (TFT))
Most of uneven sex chromosome mosaicism, existing image element circuit go to compensate the V of TFT using voltage-programmingth(threshold voltage), solves in space
The V of each DTFT (TFT of driving current is provided)thProblem of non-uniform, finally makes the electric current for flowing through each OLED in space consistent, but
It is except VthBeyond uneven, electron mobility μ can also influence the driving current of DTFT, electronics in different spaces and different time
Mobility [mu] is likely to uneven, and voltage-programming cannot compensate electron mobility μ.
In order to solve the above problems, current programmed method is suggested, i.e., using IC (integrated circuit, collection
Into circuit) provide OLED needed for stabling current by it by giving storage capacitance C after a certain circuitstCharge, stabilize it certain
One magnitude of voltage, finally by CstThe voltage of storage drives DTFT, keeps the luminosity of a frame.Above-mentioned current compensation method is in theory
V can be compensatedth, compensation electron mobility μ, still suffer from following defect：
First, the electric current needed for driving is very low, often only several milliamperes, to cause that IC is uniformly exported under low-down electric current
Difficulty it is high, and output the degree of accuracy it is relatively low；
2nd, to CstDuring being charged, the low-down electric current come from IC will be to the image element circuit that is connected
CstCharged, it is necessary to charging interval very long, so causes image quality decrease, and influence the resolution ratio of screen.
The content of the invention
Based on this, it is necessary to cannot equably export reduced-current for traditional OLED pixel circuit IC, output
The degree of accuracy is relatively low, and IC more long to the charging interval of storage capacitance, causes image quality decrease, and influence the resolution ratio of screen
A kind of defect, there is provided luminous display unit.
A kind of luminous display unit, including：Image element circuit, operational amplifier and data wire, the image element circuit include depositing
Storing up electricity holds Cst, transistor DTFT, electroluminescent device, the first feedback end and the second feedback end, the first of the storage capacitance Cst
End is connected with the source electrode of the transistor DTFT, the storage capacitance CstThe grid of the second end and the transistor DTFT connect
Connect, the source electrode of the transistor DTFT is used to be connected with the first power supply, drain electrode and the electroluminescent of the transistor DTFT
The positive pole connection of device, the negative pole of the electroluminescent device is used to be connected with second source, the grid of the transistor DTFT
It is connected with first feedback end, the positive pole of the electroluminescent device is connected with second feedback end, the operation amplifier
The inverting input of device is connected with the data wire, and the normal phase input end of the operational amplifier connects with second feedback end
Connect, the output end of the operational amplifier is connected with first feedback end.
Wherein in one embodiment, also including scan line, the image element circuit also includes on-off circuit, the electroluminescent hair
The positive pole of optical device is connected by the on-off circuit with second feedback end, and the grid of the transistor DTFT is by described
On-off circuit is connected with first feedback end, and the on-off circuit is connected with the scan line, and the on-off circuit is used for
Turned on when receiving the signal of the scan line.
Wherein in one embodiment, the on-off circuit includes transistor T1 and transistor T2, the transistor T1's
Source electrode is connected with the positive pole of the electroluminescent device, and the drain electrode of the transistor T1 is connected with second feedback end, described
The grid of transistor T1 is connected with the scan line, and the source electrode of the transistor T2 is connected with first feedback end, the crystalline substance
The drain electrode of body pipe T2 is connected with the grid of the transistor DTFT, and the grid of the transistor T2 is connected with the scan line.
Wherein in one embodiment, including multiple image element circuits, multiple operational amplifiers and multiple institutes
Data wire is stated, first feedback end of each image element circuit is connected with the output end of operational amplifier described in, each
Second feedback end one of the image element circuit is connected with the normal phase input end of the operational amplifier, and each computing is put
The inverting input of big device is connected with data wire described in.
Wherein in one embodiment, multiple image element circuit rectangular arrays are set, and each row pixel electricity
Road is connected with the same operational amplifier.
Wherein in one embodiment, first feedback end of each row image element circuit is put with the same computing
The output end connection of big device, second feedback end of each row image element circuit and the positive of the same operational amplifier
Input is connected, and the inverting input of each operational amplifier is connected with data wire described in.
Wherein in one embodiment, including multiple scan lines, image element circuit and the same scan line described in per a line
Connection.
Wherein in one embodiment, the on-off circuit of each image element circuit is connected with the same scan line.
Wherein in one embodiment, the electroluminescent device includes Organic Light Emitting Diode OLED.
Wherein in one embodiment, the operational amplifier has the first power end and second source end, described first
Power end is used to be connected with first power supply, and the second source end is used to be connected with the second source.
Above-mentioned luminous display unit, is connected by operational amplifier with image element circuit, forms feedback circuit, and data wire is fortune
Calculate amplifier and voltage is provided, the voltage amplified by operational amplifier is output as storage capacitance C from output endstCharge so that deposit
Storing up electricity holds CstCan quick charge, and after the feedback circuit stabilization being made up of operational amplifier and image element circuit so that electroluminescent
Luminescent device lights so that data wire only needs to provide corresponding operating voltage according to the operating current of electroluminescent device, you can
Realize that electroluminescent device realizes the luminous of each GTG.Effectively reduced to the electric current of electroluminescent device by said process
Output difficulty, and reduce storage capacitance CstCharging interval, effectively improve picture quality, improve the resolution ratio of screen.
Brief description of the drawings
Fig. 1 is the luminous display unit circuit diagram of one embodiment；
Fig. 2 is the luminous display unit circuit diagram of another embodiment；
Fig. 3 is the luminous display unit circuit diagram of another embodiment；
Fig. 4 is intended to for multiple scanning-line signal waveforms of one embodiment.
Specific embodiment
For the ease of understanding the present invention, the present invention is described more fully below with reference to relevant drawings.In accompanying drawing
Give better embodiment of the invention.But, the present invention can be realized in many different forms, however it is not limited to herein
Described implementation method.On the contrary, the purpose for providing these implementation methods is to make to understand more the disclosure
Plus it is thorough comprehensive.
Unless otherwise defined, all of technologies and scientific terms used here by the article with belong to technical field of the invention
The implication that technical staff is generally understood that is identical.The term for being used in the description of the invention herein is intended merely to description tool
The purpose of the implementation method of body, it is not intended that in the limitation present invention.Term as used herein " and/or " include one or more
The arbitrary and all of combination of related Listed Items.
For example, a kind of luminous display unit, including：Image element circuit, operational amplifier and data wire, the image element circuit bag
Include storage capacitance Cst, transistor DTFT, electroluminescent device, the first feedback end and the second feedback end, the storage capacitance Cst's
First end is connected with the source electrode of the transistor DTFT, the storage capacitance CstThe second end and the transistor DTFT grid
Pole connects, and the source electrode of the transistor DTFT is connected with the first power supply, drain electrode and the electroluminescent of the transistor DTFT
The positive pole connection of device, the negative pole of the electroluminescent device is connected with second source, the grid of the transistor DTFT and institute
The connection of the first feedback end is stated, the positive pole of the electroluminescent device is connected with second feedback end, the operational amplifier
Inverting input is connected with the data wire, and the normal phase input end of the operational amplifier is connected with second feedback end, institute
The output end for stating operational amplifier is connected with first feedback end.
In above-described embodiment, it is connected with image element circuit by operational amplifier, forms feedback circuit, data wire is put for computing
Big device provides voltage, and the voltage amplified by operational amplifier is output as storage capacitance C from output endstCharge so that storage electricity
Hold CstCan quick charge, and after the feedback circuit stabilization being made up of operational amplifier and image element circuit so that electroluminescent
Device lights so that data wire only needs to provide corresponding operating voltage according to the operating current of electroluminescent device, you can realize
Electroluminescent device realizes the luminous of each GTG.Output to the electric current of electroluminescent device is effectively reduced by said process
Difficulty, and reduce storage capacitance CstCharging interval, effectively improve picture quality, improve the resolution ratio of screen.
A kind of luminous display unit is provided in one embodiment, including：Multiple pixel cells, each pixel cell is one
Individual luminescence unit, each pixel cell includes an image element circuit.In the present embodiment, luminous display unit also includes multiple computings
Amplifier and multiple data wires, each operational amplifier are connected with a data wire, and the data wire is DATA line, for example, data wire
For providing data-signal, data wire is used to provide VdataSignal, for example, data wire is used to provide voltage Vdata。
As shown in figure 1, each image element circuit includes storage capacitance Cst, transistor DTFT, electroluminescent device, first
Feedback end and the second feedback end, the first end of the storage capacitance Cst are connected with the source electrode of the transistor DTFT, it is described to deposit
Storing up electricity holds CstThe second end be connected with the grid of the transistor DTFT, the source electrode of the transistor DTFT is used for and the first power supply
Connection, the drain electrode of the transistor DTFT is connected with the positive pole of the electroluminescent device, the negative pole of the electroluminescent device
For being connected with second source, the grid of the transistor DTFT is connected with first feedback end, the electroluminescent device
Positive pole be connected with second feedback end, the inverting input of the operational amplifier OP is connected with the data wire, described
The normal phase input end of operational amplifier OP is connected with second feedback end, the output end of the operational amplifier OP and described
One feedback end is connected.
In the present embodiment, electroluminescent device includes Organic Light Emitting Diode OLED, for example, electroluminescent device is organic
Light emitting diode OLED, Organic Light Emitting Diode OLED has positive pole and negative pole, for example, Organic Light Emitting Diode OLED is just
Extremely anode, the negative pole of Organic Light Emitting Diode OLED is negative electrode, it should be understood that in other examples, electroluminescent hair
Optical device also includes that other are activated and luminous display device using electroluminescent material, and these electroluminescent devices all have
There are positive pole and negative pole, its function in luminous display unit is the same, not burdensome description in following examples, in each embodiment,
Electroluminescent device is Organic Light Emitting Diode OLED, and and for example, electroluminescent device is LED.For example, crystal
Pipe DTFT is the TFT for providing driving current.
For example, the positive pole of the Organic Light Emitting Diode OLED passes through second feedback end and the operational amplifier OP
Normal phase input end connection, for example, the grid of the transistor DTFT pass through first feedback end and the operational amplifier
The output end connection of OP.For example, the positive pole of Organic Light Emitting Diode OLED connects with the normal phase input end of the operational amplifier OP
Connect, for example, the grid of the transistor DTFT is connected with the output end of the operational amplifier OP, i.e., in the present embodiment, institute
The grid of transistor DTFT is stated as the first feedback end, the positive pole of the Organic Light Emitting Diode OLED is used as the second feedback end.
For example, first power supply is power vd D, for example, the second source is power supply VSS, for example, power vd D is used for
There is provided positive voltage, for example, power supply VSS be used for negative voltage is provided, for example, the operational amplifier OP have the first power end and
Second source end, first power end is used to be connected with first power supply, and the second source end is used for and described second
Power supply is connected, for example, first power end of the operational amplifier OP is connected with power vd D, the operational amplifier OP
The second source end be connected with power supply VSS, i.e. operational amplifier OP is connected with power vd D and power supply VSS, in this reality
In applying example, operational amplifier OP use with image element circuit identical power supply, so, operational amplifier OP is receiving positive input
After the signal of end and inverting input, the voltage signal of output is calculated between the magnitude of voltage of power vd D and the magnitude of voltage of power supply VSS
Between.In a further embodiment, operational amplifier OP can also use the power supply different from image element circuit, for example, the fortune
Calculating amplifier OP has the first power end and second source end, and first power end is used to be connected with the 3rd power supply, institute
Second source end is stated for be connected with the 4th power supply, so, operational amplifier OP calculates the voltage signal that exports between the
Between the magnitude of voltage of the magnitude of voltage of three power supplys and the 4th power supply.It is noted that the magnitude of voltage and the 4th power supply of the 3rd power supply
The difference of magnitude of voltage should be within a preset range so that VgNegative-feedback regu- lation can be carried out in enough scopes.
Specifically, the voltage of Organic Light Emitting Diode OLED positive poles is Vanode, the grid voltage of transistor DTFT is Vg, it is brilliant
The source voltage of body pipe DTFT is Vs, the drain voltage of transistor DTFT is Vd, it should be understood that in Organic Light Emitting Diode
When OLED conductings are luminous, the I of Organic Light Emitting Diode OLED is flowed througholedElectric current is bigger, then Organic Light Emitting Diode OLED positive poles
Voltage VanodeIt is bigger, and because transistor DTFT connects with Organic Light Emitting Diode OLED, then flow through the electricity of transistor DTFT
Flow, i.e. I equal with the electric current for flowing through Organic Light Emitting Diode OLEDds=Ioled, then Ioled∝(Vg-Vs)2=(Vs-Vg)2, its
In, Vs>Vg, i.e. IoledWith (Vs-Vg)2Positive correlation, and Vs>Vg, it follows that VgIt is bigger, then IoledIt is smaller, VanodeIt is smaller, and by
In Vd=Vanode, therefore, VgWith VdNegative correlation, VgIt is bigger, VdIt is smaller, conversely, VgIt is smaller, VdIt is bigger.
Specifically, the connection between operational amplifier OP and image element circuit forms negative-feedback circuit, when data wire is to computing
The inverting input input V of amplifier OPdata, the voltage of the normal phase input end of operational amplifier OP is Organic Light Emitting Diode
The voltage V of OLED positive polesanode, the grid of operational amplifier OP output voltages to transistor DTFT, that is, operational amplifier
The output voltage V of OPg, Vg=K* (Vp-Vn), wherein K is amplification coefficient, VpIt is the voltage of normal phase input end, Vp=Vanode, VnFor
The voltage of inverting input, Vn=Vdata, i.e. Vg=K* (Vp-Vn)=K* (Vanode-Vdata)=K* (Vd-Vdata), according to computing
The operation principle of amplifier OP, if Vp>Vn, then the V of output endgIt is bigger, if instead Vp<Vn, then the V of output endgIt is smaller, this
Sample, due to VgWith VdNegative correlation, if V at the beginninggIt is excessive, then VdReduce, VpWith VnDifference also reduce, so, export VgSubtract
It is small, if VgIt is too small, then VdIncrease, VpWith VnDifference also increase, by above-mentioned negative-feedback, finally cause VpTend to be equal to Vn,
So, the V of operational amplifier OP outputsgThen it is intended to stabilization, the negative-feedback circuit being finally made up of operational amplifier OP is in number
Us sets up stable state in the time, according to " empty short " and " void is disconnected ", has：
Vanode=Vp=Vn=Vdata,
In=Ip=0,
Wherein, InTo flow through the electric current of inverting input, IpTo flow through the electric current of normal phase input end, after stabilization, Vp=
Vn, the voltage of inverting input is equal with the voltage of normal phase input end, equivalent to " empty short ", because operational amplifier OP is input into electricity
Resistance is very big, when voltage tends to equal, and when smaller, by a larger resistance, operational amplifier OP equivalent to " void is disconnected ",
Therefore, In=Ip=0.
It is noted that operational amplifier OP can in a short time set up stable state so that Vanode=Vp=Vn
=Vdata, In=Ip=0, and because operational amplifier OP can export larger voltage, therefore, it is possible to storage capacitance CstHurry up
Speed charges, and effectively increases charge efficiency, reduces storage capacitance CstCharging interval, operational amplifier OP disconnect and pixel
After the connection of circuit, storage capacitance CstBurning voltage can be provided for the grid of transistor DTFT, it is worth mentioning at this point that, storage electricity
Hold CstTwo ends are connected with the grid and source electrode of transistor DTFT respectively, therefore, storage capacitance CstCan be transistor DTFT's
Grid provides burning voltage so that transistor DTFT can stably for Organic Light Emitting Diode OLED provides operating current.
For example, data wire is used to provide voltage according to the luminous voltage of Organic Light Emitting Diode OLED, therefore, VdataIt is root
Determine according to the U-I relations of Organic Light Emitting Diode OLED, VdataIt is to enable to Organic Light Emitting Diode OLED to produce each
The I that GTG needsoledAnode voltage corresponding to electric current, therefore the electric current for reaching Organic Light Emitting Diode OLED after stable state is exactly
V in the U-I relations that OLED determinesdataCorresponding Ioled, and flow through the electric current I of transistor DTFTds=Ioled。
Saturation region is operated in by controlling transistor DTFT, the driving current I according to transistordsRelational expression：
Wherein, μ is the electron mobility of raceway groove, CoxIt is the channel capacitance of driving tube unit area, W is that DTFT raceway grooves are wide
Degree, L is DTFT channel lengths.In an image element circuit, the C of transistor DTFTox, W, L be invariable, μ and VthOne
Will not also change in fixing time, in different image element circuits, μ and VthIt is different after respectively through the feedback of operational amplifier OP
The μ and V of image element circuitthCompensation is respectively obtained, therefore, for different image element circuits, can finally cause pixel electricity
Road produces identical Ioled, and then cause Organic Light Emitting Diode OLED work.Because the output end of operational amplifier OP is to deposit
Storing up electricity holds CstCharge, therefore, after circuit enters stable state, operational amplifier OP can be removed from circuit, i.e., put in computing
After big device OP disconnects the connection with image element circuit, storage capacitance CstThe V of stabilization can be provided for the grid of transistor DTFTg, make
Obtain transistor DTFT and be operated in saturation region, transistor DTFT is in VgUnder to enable to flow through the electric current of transistor DTFT be Ids=
IoledSo that transistor DTFT can be the luminous offer driving current of Organic Light Emitting Diode OLED, that is, operation amplifier
After device OP disconnects the connection with image element circuit, VgAnd VsStill stablize constant, transistor DTFT operational amplifier OP disconnection after still
Driving current I can be producedds=Ioled, drive Organic Light Emitting Diode OLED to light.
Even if as can be seen that the V of the middle transistor DTFT of each image element circuitth, μ or other specification it is spatially uneven
It is even or after only allowing for a long time it is different, but by after the feedback of operational amplifier OP, each image element circuit Vth, μ all
Compensation is arrived, for the V that each image element circuit givesdata, glow current is all Ioled, that is to say, that glow phase, You Jifa
The electric current of optical diode OLED and the parameter of transistor DTFT are almost unrelated, therefore, after operational amplifier OP disconnections, transistor
DTFT can be the luminous offer driving current of Organic Light Emitting Diode OLED.
In order to realize the control of the image element circuit of the access to operational amplifier OP, in one embodiment, such as Fig. 2 institutes
Show, luminous display unit also includes scan line, the image element circuit also includes on-off circuit, the Organic Light Emitting Diode OLED
Positive pole be connected with second feedback end by the on-off circuit, the grid of the transistor DTFT is by the switch electricity
Road is connected with first feedback end, and the on-off circuit is connected with the scan line, and the on-off circuit is used to receive
Turned on during the signal of the scan line.
For example, the positive pole of the Organic Light Emitting Diode OLED passes through the on-off circuit with the operational amplifier OP's
Normal phase input end is connected, the output end that the grid of the transistor DTFT passes through the on-off circuit and the operational amplifier OP
Connection, in the present embodiment, on-off circuit is used as the first feedback end and the second feedback end.
For example, the scan line is scan lines, for example, the scan line is used to provide scanning signal, for example, the scan line is used for
Scan signals are provided, for example, on-off circuit is used to be turned on when the low level signal of scan line is received, so, due to switch
Circuit turn-on so that operational amplifier OP is connected with image element circuit, so, when operational amplifier OP reaches stable state, will
Operational amplifier OP disconnects with the connection of image element circuit, by storage capacitance CstFor transistor DTFT provides voltage so that crystal
Pipe DTFT is operated in saturation region, is the luminous offer driving current of Organic Light Emitting Diode OLED, and transistor DTFT can be
Organic Light Emitting Diode OLED provides the electric current of stabilization so that Organic Light Emitting Diode OLED holds after operational amplifier OP disconnections
Supervention light.
In order to realize the control for being linked into image element circuit to operational amplifier OP, in one embodiment, such as Fig. 2 institutes
Show, the on-off circuit includes source electrode and the Organic Light Emitting Diode of transistor T1 and transistor T2, the transistor T1
The positive pole connection of OLED, the drain electrode of the transistor T1 is connected with second feedback end, the grid of the transistor T1 and institute
State scan line connection, the source electrode of the transistor T2 is connected with first feedback end, the drain electrode of the transistor T2 with it is described
The grid connection of transistor DTFT, the grid of the transistor T2 is connected with the scan line.
For example, the positive pole of the Organic Light Emitting Diode OLED is connected by the transistor T1 with second feedback end
Connect, the grid of the transistor DTFT is connected by the transistor T2 with first feedback end, for example, organic light-emitting diodes
The positive pole of pipe OLED passes sequentially through the source electrode of transistor T1 and drain electrode is connected with the normal phase input end of operational amplifier OP, and computing is put
The output end of big device OP passes sequentially through transistor T2 source electrodes and drain electrode is connected with the grid of transistor DTFT, brilliant in the present embodiment
Used as the second feedback end, the source electrode of transistor T2 is used as the first feedback end for the drain electrode of body pipe T1.
For example, the voltage of first feedback end of the image element circuit is V0, for example, described the of the image element circuit
The voltage of two feedback ends is Vdt, i.e. V in figure0And VdtThe first feedback end and the second feedback end can be seen as.
In the present embodiment, transistor T1 and transistor T2 are pmos transistors, also known as p-type mos transistors, transistor
T1 and transistor T2 are turned under low level, specifically, when scan line exports low level, the corresponding crystalline substance being connected with scan line
Body pipe T1 and transistor T2 is turned on.In other examples, transistor T1 and transistor T2 are nmos transistors, also known as n
Type mos transistors, when transistor T1 and transistor T2 are nmos transistors, in Organic Light Emitting Diode OLED glow phases,
Its principle is consistent with above-described embodiment, and the electric current of Organic Light Emitting Diode OLED and the parameter of transistor DTFT are equally unrelated, this
No longer burden description in embodiment.
When transistor T1 and transistor T2 is turned on, operational amplifier OP is connected with image element circuit, and data wire is by fortune
Calculate the inverting input input V of amplifier OPdataVoltage, after operational amplifier OP reaches stabilization, transistor DTFT is organic hair
Optical diode OLED provides IoledSo that Organic Light Emitting Diode OLED normal works, then, scan line output high level is brilliant
Body pipe T1 and transistor T2 ends, and operational amplifier OP disconnects the connection with image element circuit.
In order to drive multiple pixel cells to light, in one embodiment, as shown in figure 3, luminous display unit is including more
The individual image element circuit, multiple operational amplifier OP and multiple data wire (Vdata(1)……Vdata(n)), Mei Yisuo
First feedback end for stating image element circuit is connected with the output end of operational amplifier OP described in, each image element circuit
Second feedback end one is connected with the normal phase input end of the operational amplifier OP, and each operational amplifier OP's is anti-phase
Input is connected with data wire described in.
For example, each image element circuit includes a storage capacitance Cst, a transistor DTFT, an Organic Light Emitting Diode
OLED, the first feedback end and the second feedback end, in the present embodiment, each data wire provides V for an operational amplifierdata, computing
Amplifier is exported by the feedback of data-signal and image element circuit and amplifies signal to image element circuit so that storage capacitance CstCan
It is rapidly filled with electricity so that corresponding transistor DTFT provides I for Organic Light Emitting Diode OLEDoled, and then realize to multiple pictures
The driving of plain unit so that pixel cell lights, multiple image element circuits constitute multiple pixel cells, it is achieved thereby that multiple pixels
Unit it is luminous so that luminous display unit shows different images.
In order to drive the pixel cell in matrix distribution of multiple lines and multiple rows, for example, as shown in figure 3, multiple pixel electricity
Road rectangular array is set, and each row image element circuit is connected with the same operational amplifier OP.For example, each row institute
First feedback end for stating image element circuit is connected with the output end of the same operational amplifier OP, each row pixel electricity
Second feedback end on road is connected with the normal phase input end of the same operational amplifier OP, each operational amplifier OP
Inverting input be connected with data wire described in.For example, the voltage of first feedback end of each row image element circuit
It is V0, for example, the voltage of second feedback end of each row image element circuit is Vdt, i.e. V in figure0And VdtCan be seen as
One feedback end and the second feedback end.
For example, multiple image element circuits of each row are connected with same operational amplifier OP, for example, multiple institutes of same row
State output end of first feedback end of image element circuit with the same operational amplifier OP to be connected, multiple institutes of same row
Second feedback end for stating image element circuit is connected with the normal phase input end of the same operational amplifier OP.
In the present embodiment, multiple image element circuits of same row are connected to same operational amplifier OP, the i.e. multiple of same row
Image element circuit shares an operational amplifier OP, can effectively reduce the quantity of operational amplifier OP in luminous display unit, enters
And reduce the electronic component scale of luminous display unit, and luminous display unit has been simplified, reduce manufacturing cost.
In order to realize that multiple image element circuits share an operational amplifier OP, for example, as shown in figure 3, luminous display unit
Including multiple scan lines (Scan (1), Scan (2) ... ... Scan (m-1)), described swept with same per image element circuit described in a line
Line connection is retouched, for example, the on-off circuit of each image element circuit is connected with the same scan line, in the present embodiment, pixel
The on-off circuit of circuit includes transistor T1 and transistor T2, for example, the transistor T1 and transistor of each image element circuit
T2 is connected with the same scan line, for example, the grid of the grid of the transistor T1 of same image element circuit and transistor T2 with it is same
Scan line is connected, for example, the scan line of multirow is used for the outputs level signals in different sequential, for example, the scan line of multirow
For exporting low level in different sequential.In the present embodiment, multiple image element circuits of same row are connected to same operation amplifier
Device OP.
So, in different sequential, different scan lines exports low level respectively, the transistor of the image element circuit do not gone together
T1 and transistor T2 are respectively turned on, and are simultaneously turned on the transistor T1 and transistor T2 of the image element circuit of a line, so, when same
When the transistor T1 and transistor T2 of the image element circuit on row are turned on, respective column is respectively connecting to the image element circuit in a line
The feedback of operational amplifier OP, operational amplifier OP causes that the transistor DTFT of each image element circuit on the row is organic light emission two
Pole pipe OLED provides operating current, and high level is exported in scan line so that after transistor T1 and transistor T2 disconnects, transistor
DTFT is continuously Organic Light Emitting Diode OLED and provides operating current so that the Organic Light Emitting Diode OLED of the row lights, its
The course of work of the image element circuit of his each row by that analogy, and then cause at any one time, only the image element circuit of a line with fortune
Calculate amplifier OP to connect, and multiple image element circuits of same row are connected due to the operational amplifier OP of each row, therefore, same
Moment, an operational amplifier OP is connected with an image element circuit.
For example, incorporated by reference to Fig. 3 and Fig. 4, different scan line (Scan (1), Scan (2) ... ... Scan (m-1), Scan
(m)) in different sequential export low level signals, such as, in first sequential, scan line Scan (1) exports low level, first
Transistor T1 and transistor the T2 conducting of capable image element circuit, and the transistor T1 of the image element circuit of other rows and transistor T2 are then
End under high level, so, in multiple image element circuits of same row, a crystal for image element circuit only in the first row
Pipe T1 and transistor T2 is turned on, and is connected with corresponding operational amplifier OP, by operational amplifier OP to storage capacitance CstQuickly
It is fully charged, and by the feedback of operational amplifier OP so that transistor DTFT is operated in saturation region for Organic Light Emitting Diode
OLED provides electric current needed for work, then, in next sequential, scan line Scan (1) output high level, the pixel of the first row
Transistor T1 and transistor the T2 cut-off of circuit, first feedback end and the second feedback end of the image element circuit of the first row break
Open, and due to storage capacitance CstElectricity is had been filled with, voltage can be provided for transistor DTFT, and then enable that transistor DTFT is
Organic Light Emitting Diode provides operating current, that is, cause that transistor DTFT remains to produce after operational amplifier OP disconnections and drive electricity
Stream Ids=Ioled, drive Organic Light Emitting Diode OLED to light.
In the above-described embodiments, the scan line by not gone together in control sends low level in different sequential, and then
So that the image element circuit do not gone together is connected with operational amplifier OP respectively in different sequential, and then realize multiple pictures of same row
Plain circuit shares an operational amplifier OP, has effectively simplified the element scale of luminous display unit, reduces manufacturing cost.
In order to realize the connection of operational amplifier, for example, setting multiple IC (integrated circuit, integrated electricity
Road), every IC includes an operational amplifier, and every IC is connected with a row image element circuit, in order to further simplify element
Scale, it may for example comprise an amplifier IC, each amplifier IC include multiple operational amplifiers, and the amplifier IC and multiple row picture
Plain circuit connection, each operational amplifier in amplifier IC is connected with a row image element circuit, so, it is possible to reduce parts number
Amount, has effectively simplified the element scale of luminous display unit.
And for example, also including control IC, for example, data wire is connected with control IC, for example, scan line is connected with control IC, should
Control IC includes multiple data pins, and control IC includes multiple VdataInterface, U-Is of the IC according to Organic Light Emitting Diode OLED
Characteristic exports the required voltage of Organic Light Emitting Diode OLED work, namely V by data wire to image element circuitdata, so that
Image element circuit by after the feedback of operational amplifier, the electric current I needed for producing Organic Light Emitting Diode OLEDoledSo that
The electric current of glow phase Organic Light Emitting Diode OELD is unrelated with the parameter of transistor DTFT.
Additionally, in order to further reduce number of elements, for example, control IC also includes operational amplifier, for example, multiple computings
Amplifier is integrated in a control IC as a computing module, in such manner, it is possible to further reduce number of elements, is effectively simplified
The element scale of luminous display unit.
Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality
Apply all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, the scope of this specification record is all considered to be.
Embodiment described above only expresses several embodiments of the invention, and its description is more specific and detailed, but simultaneously
Can not therefore be construed as limiting the scope of the patent.It should be pointed out that coming for one of ordinary skill in the art
Say, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention
Scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (10)
1. a kind of luminous display unit, it is characterised in that including：Image element circuit, operational amplifier and data wire, the pixel electricity
Road includes storage capacitance Cst, transistor DTFT, electroluminescent device, the first feedback end and the second feedback end, the storage capacitance
The first end of Cst is connected with the source electrode of the transistor DTFT, the storage capacitance CstThe second end and the transistor DTFT
Grid connection, the source electrode of the transistor DTFT is used to be connected with the first power supply, the drain electrode of the transistor DTFT with it is described
The positive pole connection of electroluminescent device, the negative pole of the electroluminescent device is used to be connected with second source, the transistor
The grid of DTFT is connected with first feedback end, and the positive pole of the electroluminescent device is connected with second feedback end, institute
The inverting input for stating operational amplifier is connected with the data wire, the normal phase input end of the operational amplifier and described second
Feedback end is connected, and the output end of the operational amplifier is connected with first feedback end.
2. luminous display unit according to claim 1, it is characterised in that also including scan line, the image element circuit is also
Including on-off circuit, the positive pole of the electroluminescent device is connected by the on-off circuit with second feedback end, described
The grid of transistor DTFT is connected by the on-off circuit with first feedback end, the on-off circuit and the scan line
Connection, the on-off circuit is used to be turned on when the signal of the scan line is received.
3. luminous display unit according to claim 2, it is characterised in that the on-off circuit includes transistor T1 and crystalline substance
Body pipe T2, the source electrode of the transistor T1 is connected with the positive pole of the electroluminescent device, the drain electrode of the transistor T1 and institute
State the connection of the second feedback end, the grid of the transistor T1 is connected with the scan line, the source electrode of the transistor T2 with it is described
First feedback end is connected, and the drain electrode of the transistor T2 is connected with the grid of the transistor DTFT, the grid of the transistor T2
Pole is connected with the scan line.
4. luminous display unit according to claim 2, it is characterised in that including multiple image element circuits, Duo Gesuo
Operational amplifier and multiple data wires are stated, first feedback end and the computing described in of each image element circuit are put
The output end connection of big device, second feedback end one of each image element circuit is input into the positive of the operational amplifier
End connection, the inverting input of each operational amplifier is connected with data wire described in.
5. luminous display unit according to claim 4, it is characterised in that multiple image element circuit rectangular arrays set
Put, and each row image element circuit is connected with the same operational amplifier.
6. luminous display unit according to claim 5, it is characterised in that described the first of each row image element circuit
Feedback end is connected with the output end of the same operational amplifier, second feedback end of each row image element circuit with it is same
The normal phase input end connection of operational amplifier described in, data wire described in the inverting input and of each operational amplifier
Connection.
7. luminous display unit according to claim 4, it is characterised in that including multiple scan lines, picture described in per a line
Plain circuit is connected with the same scan line.
8. luminous display unit according to claim 7, it is characterised in that the on-off circuit of each image element circuit with
The same scan line connection.
9. luminous display unit according to claim 1, it is characterised in that the electroluminescent device includes organic light emission
Diode OLED.
10. luminous display unit according to claim 1, it is characterised in that the operational amplifier has the first power supply
End and second source end, first power end be used for be connected with first power supply, the second source end for it is described
Second source is connected.
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| CN201710104350.6A CN106910465A (en) | 2017-02-24 | 2017-02-24 | Luminous display unit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710104350.6A CN106910465A (en) | 2017-02-24 | 2017-02-24 | Luminous display unit |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107731162A (en) * | 2017-10-20 | 2018-02-23 | 京东方科技集团股份有限公司 | Pixel-driving circuit and driving method, display driver circuit, display base plate and display device |
| WO2019214263A1 (en) * | 2018-05-09 | 2019-11-14 | 京东方科技集团股份有限公司 | Pixel circuit and driving method therefor, and display panel |
| CN110767172A (en) * | 2019-10-31 | 2020-02-07 | 武汉天马微电子有限公司 | Display panel control method, control device, driving chip and display device |
| CN111048029A (en) * | 2019-12-31 | 2020-04-21 | 上海视欧光电科技有限公司 | Data driving circuit, driving chip, display device and driving method thereof |
| CN111312173A (en) * | 2018-12-11 | 2020-06-19 | 昆山工研院新型平板显示技术中心有限公司 | Pixel circuit and pixel driving method |
| CN111681601A (en) * | 2020-06-02 | 2020-09-18 | 武汉华星光电半导体显示技术有限公司 | Display device |
| US11804157B2 (en) | 2021-12-13 | 2023-10-31 | Lg Display Co., Ltd. | Electroluminescent display apparatus and display defect detection method thereof |
| CN117238241A (en) * | 2023-11-15 | 2023-12-15 | 中科(深圳)无线半导体有限公司 | Micro LED current type driving circuit and implementation method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005266089A (en) * | 2004-03-17 | 2005-09-29 | Sanyo Electric Co Ltd | Display apparatus |
| CN1816837A (en) * | 2003-07-03 | 2006-08-09 | 汤姆森许可贸易公司 | Active matrix image display device |
| JP2009156929A (en) * | 2007-12-25 | 2009-07-16 | Canon Inc | Display device, and display and digital camera with the same |
| CN101542571A (en) * | 2006-11-28 | 2009-09-23 | 皇家飞利浦电子股份有限公司 | Active matrix light emitting display device and driving method thereof |
| US20120120041A1 (en) * | 2010-02-04 | 2012-05-17 | Makoto Kohno | Display device |
-
2017
- 2017-02-24 CN CN201710104350.6A patent/CN106910465A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1816837A (en) * | 2003-07-03 | 2006-08-09 | 汤姆森许可贸易公司 | Active matrix image display device |
| JP2005266089A (en) * | 2004-03-17 | 2005-09-29 | Sanyo Electric Co Ltd | Display apparatus |
| CN101542571A (en) * | 2006-11-28 | 2009-09-23 | 皇家飞利浦电子股份有限公司 | Active matrix light emitting display device and driving method thereof |
| JP2009156929A (en) * | 2007-12-25 | 2009-07-16 | Canon Inc | Display device, and display and digital camera with the same |
| US20120120041A1 (en) * | 2010-02-04 | 2012-05-17 | Makoto Kohno | Display device |
| CN102741908A (en) * | 2010-02-04 | 2012-10-17 | 全球Oled科技有限责任公司 | Oled display device |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10657890B2 (en) | 2017-10-20 | 2020-05-19 | Beijing Boe Display Technology Co., Ltd. | Pixel driving circuit and driving method thereof, display driving circuit, display substrate and display device |
| CN107731162B (en) * | 2017-10-20 | 2019-08-27 | 京东方科技集团股份有限公司 | Pixel-driving circuit and driving method, display driver circuit, display base plate and display device |
| CN107731162A (en) * | 2017-10-20 | 2018-02-23 | 京东方科技集团股份有限公司 | Pixel-driving circuit and driving method, display driver circuit, display base plate and display device |
| WO2019214263A1 (en) * | 2018-05-09 | 2019-11-14 | 京东方科技集团股份有限公司 | Pixel circuit and driving method therefor, and display panel |
| US11315490B2 (en) | 2018-05-09 | 2022-04-26 | Boe Technology Group Co., Ltd. | Pixel circuit having a voltage amplification circuit and driving method thereof, display panel |
| CN111312173A (en) * | 2018-12-11 | 2020-06-19 | 昆山工研院新型平板显示技术中心有限公司 | Pixel circuit and pixel driving method |
| CN110767172A (en) * | 2019-10-31 | 2020-02-07 | 武汉天马微电子有限公司 | Display panel control method, control device, driving chip and display device |
| CN111048029A (en) * | 2019-12-31 | 2020-04-21 | 上海视欧光电科技有限公司 | Data driving circuit, driving chip, display device and driving method thereof |
| CN111681601A (en) * | 2020-06-02 | 2020-09-18 | 武汉华星光电半导体显示技术有限公司 | Display device |
| WO2021243772A1 (en) * | 2020-06-02 | 2021-12-09 | 武汉华星光电半导体显示技术有限公司 | Display apparatus |
| US11862092B2 (en) | 2020-06-02 | 2024-01-02 | Wuhan China Star Optoelectronics Semiconductor Display Technology Co., Ltd. | Display panel |
| US11804157B2 (en) | 2021-12-13 | 2023-10-31 | Lg Display Co., Ltd. | Electroluminescent display apparatus and display defect detection method thereof |
| CN117238241A (en) * | 2023-11-15 | 2023-12-15 | 中科(深圳)无线半导体有限公司 | Micro LED current type driving circuit and implementation method thereof |
| CN117238241B (en) * | 2023-11-15 | 2024-02-23 | 中科(深圳)无线半导体有限公司 | Micro LED current type driving circuit and implementation method thereof |
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Application publication date: 20170630 |