CN102768821A - AMOLED (active matrix/organic light emitting diode) display and driving method of AMOLED display - Google Patents
AMOLED (active matrix/organic light emitting diode) display and driving method of AMOLED display Download PDFInfo
- Publication number
- CN102768821A CN102768821A CN2012102787807A CN201210278780A CN102768821A CN 102768821 A CN102768821 A CN 102768821A CN 2012102787807 A CN2012102787807 A CN 2012102787807A CN 201210278780 A CN201210278780 A CN 201210278780A CN 102768821 A CN102768821 A CN 102768821A
- Authority
- CN
- China
- Prior art keywords
- switch
- switch conduction
- oled
- breakover element
- breakover
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Landscapes
- Electroluminescent Light Sources (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The invention relates to an AMOLED (active matrix/organic light emitting diode) display and a driving method of the AMOLED display. The AMOLED display is provided with a compensation unit as well as a row driver and a column driver which are connected with a pixel array, wherein the compensation unit is provided with an overlaying device connected with a time sequence controller, the time sequence controller is also connected with the row driver, and the overlaying device is connected with a memory, an A/D (Analog to Digital) converter, a I/V converter and the column driver; each pixel unit of the pixel array comprises a first switch conducting element and a second switch conducting element, wherein the data conducting pins of the first switch conducting element are connected with the control pins of the column driver and a drive conducting element respectively; a capacitor is arranged between the input pin and the control pin of the drive conducting element; the input pins and the output pins of the second switch conducting element are connected with the output pins of the drive conducting element, the I/V converter and the A/D converter respectively. According to the AMOLED display and the driving method, a plurality of factors causing the image quality degradation can be compensated, the image display quality of the AMOLED display is improved, and the AMOLED display is simple in circuit structure.
Description
Technical field
The present invention relates to display and, be AMOLED display and driving method thereof concretely the driving method of said display.
Background technology
In flat panel display, numerous advantages such as organic light emitting diode display (OLED) is frivolous with it, active illuminating, fast-response speed, wide viewing angle, rich color and high brightness, low-power consumption, high-low temperature resistant and to be known as by industry be the third generation display technique after LCD (LCD).By type of drive, OLED is divided into passive type OLED (PMOLED is also referred to as passive matrix OLED) and active OLED (AMOLED is also referred to as active matrix OLED).Wherein AMOLED is through integrated thin-film transistor (TFT) and capacitor in each pixel and keep voltage method by capacitor and drive.AMOLED can realize large scale, resolution panels, is the emphasis of current research and the developing direction of following display technique, but is difficult to the driving method that realization is controlled deterioration in image quality technically, and needs higher cost.
Because there are heterogeneity in the threshold voltage and the electron mobility thereof of the driving transistors that each pixel of control AMOLED display is luminous; And threshold voltage is along with change of time also will be drifted about; Make that under identical data-signal the electric current generation deviation that flows through OLED causes display brightness uneven (MURA); The luminescence efficiency of Organic Light Emitting Diode (OLED) self also can be degenerated along with the time, makes that the luminosity reduction causes image retention under identical electric current; The driving transistors due to leakage current causes the AMOLED display can not truly reappear low image gray; The power lead impedance of driving transistors also causes the brightness of Organic Light Emitting Diode to reduce to the decay of voltage.All of these factors taken together all is the major reason that causes AMOLED display image quality deterioration.Though also research and propose the driving compensation method to above-mentioned partly cause in the industry; But a kind of method generally only can compensate wherein a certain or several kinds of deterioration in image quality that factor causes; And thin film transistor (TFT) (TFT) quantity of the required pixel-driving circuit of these methods is more, still do not have in the technique known at present a kind of can compensation above-mentioned all cause the factor and the less method of required image element circuit TFT of deterioration in image quality.
Summary of the invention
To above-mentioned problem, the invention provides a kind of AMOLED display and driving method thereof, the above-mentioned multiple factor of deterioration in image quality that causes is compensated, improve the picture quality of AMOLED display, and circuit structure is simple.To the compensation of data promptly can be real-time compensate, also can compensate in the time that the user sets.
AMOLED display of the present invention; Have the line driver and the row driver that connect pel array; Also has compensating unit; In compensating unit, be provided with the time schedule controller of receiving inputted signal, described time schedule controller is connected with described row driver through superimposer, and time schedule controller also is connected with line driver simultaneously; The input end of said superimposer also be linked in sequence storer, A/D converter and I/V converter.Line driver is identical with prior art with row driver, does not do detailed description at this, and the I/V converter is used to receive the detection electric current of pixel cell and be converted into voltage, and A/D converter is used for converting aanalogvoltage into digital voltage so that be stored in storer;
Pel array is made up of pixel cell; Comprise the first switch conduction element and second switch breakover element in each pixel cell; And the driving breakover element, two data conducting pin of the first switch conduction element connect the data line and the control pin that drives breakover element of row driver respectively; Be connected with capacitor between the control pin of the power supply input pin of driving breakover element and driving breakover element; The first switch conduction element and the control pin of second switch breakover element are connected the sweep trace of line driver simultaneously; The input pin of second switch breakover element is connected in the 3rd node with the output pin that drives breakover element, and the output pin of second switch breakover element is connected to the I/V converter and the A/D converter of compensating unit through detection line; The positive pole of OLED is connected with the 3rd node.Through the heterogeneity of driving breakover element threshold voltage and deviation and the caused luminance non of threshold voltage drift in time and the deviation of electron mobility in the compensation pixel unit, thereby improve picture quality.Described breakover element can be transistor or triode, also can be other element with similar functions, circuit structure.
On above-mentioned basis, the output terminal of the time schedule controller of compensating unit also is connected with light emission controller; Also has the 3rd switch conduction element in the said pixel cell; The control pin of the 3rd switch conduction element is connected with described light emission controller through the light emitting control line; Receive the control signal of light emission controller, the positive pole of said OLED is connected with the 3rd node with input pin through the output pin of the 3rd switch conduction element.With respect to the most basic pixel unit circuit of AMOLED display; Second switch breakover element and the 3rd switch conduction element have only been increased in the pixel cell of display of the present invention; And detection line and light emitting control line; Therefore the present invention is when realizing that compensation is multiple and causing the deterioration in image quality factor, and pixel unit circuit has only adopted the least possible element and control linkage relation simple, helps producing and implements.Through calculating the OLED degree of degeneration and compensate, and then phenomenons such as the brightness irregularities (MURA) of eliminating the AMOLED display and image retention are with the image of acquisition high-quality.
Preferably, described storer is to have (LUT:Look-Up-Table) storer that shows look-up table.LUT is a RAM (random access memory) in essence, after it writes RAM to data in advance, tables look-up whenever signal of input just equals to import an address, finds out the corresponding content in address, then output.Here LUT is appreciated that the mapping table for being a compensation pixel gray-scale value; What it arrived actual samples passes through certain conversion (like threshold value, counter-rotating, binaryzation, contrast adjustment, linear transformation etc.) with grey scale pixel value current corresponding or voltage; Become the corresponding with it grey level compensation value of another one; Can play the useful information of outstanding image like this, the effect of the optical contrast ratio of correcting image.
Preferably, described each breakover element is transistor.
The present invention also provides the driving method that is used for said AMOLED display: the time schedule controller of compensating unit receives the input signal that comprises viewdata signal; Time schedule controller control line driver output line scan signals is carried out addressing line by line to the pixel cell of pel array; Described viewdata signal carries out correction process through superimposer; Superimposer carries out sum operation with image stored offset data in viewdata signal and the storer and obtains the view data superposed signal; After the data input pin input of pixel cell, the OLED of pixel cell sends corresponding brightness according to the size of the view data superposed signal of input to described view data superposed signal through row driver.Since in the storer image stored offset data be according to detection line to threshold voltage, mobility and the power lead impedance of the driving breakover element of pixel cell to the monitoring of the decay of supply voltage etc. and calculate; Therefore after the stack compensation; OLED just can send the light with the original corresponding object brightness of viewdata signal, thereby obtains the image of high-quality.
Preferably, the output terminal of the time schedule controller of compensating unit is connected with light emission controller; Have the 3rd switch conduction element in the described pixel cell, light emission controller is delivered to control signal in the pixel cell through the control pin of the 3rd switch conduction element; The positive pole of OLED is connected with the 3rd node with input pin through the output pin of the 3rd switch conduction element;
When the viewdata signal that detects input when light emission controller corresponded to minimum gray scale, the control signal of the 3rd switch conduction element of pixel cell was turn-offed in output, made that OLED is true to reappear pitch black image, and can not send the low light level because of weak current.
Concrete, described driving method is divided into first detection period, second detection period, amortization period and light emission period;
First detection period is used for detecting and calculate the pressure drop of the threshold voltage that drives breakover element (T2), electron mobility, power lead equiva lent impedance: with the first switch conduction element (T1) and second switch breakover element (T4) conducting, the 3rd switch conduction element (T3) ends through compensating unit and line driver; Detect respectively make OLED just luminous, send arbitrary intermediate luminance light and send the high-high brightness light time, drive the electric current of breakover element (T2), this electric current feeds back to the I/V converter after store behind the A/D converter by detection line (Det); According to the detection electric current of storage, calculate the also pressure drop of threshold voltage, electron mobility and the power lead equiva lent impedance of storing driver breakover element (T2);
Second detection period is used to detect degree of degeneration and calculatings of OLED need be to the compensation rate of the view data of input: with the 3rd switch conduction element (T3) conducting, storage warp first switch conduction element (T1) and second switch breakover element (T4) feed back to the anode voltage value of the reflection OLED degree of degeneration of A/D converter; According to threshold voltage, electron mobility, the pressure drop of power lead equiva lent impedance and the voltage of reflection OLED degree of degeneration of the driving breakover element (T2) of storage, calculate and storage need be to the compensation rate of the view data imported;
In amortization period; The first switch conduction element and the conducting of second switch breakover element, the 3rd switch conduction element ends, and makes OLED not luminous; Compensating unit is imported through compensator corrected image data signal to pixel cell, and charges to capacitor through the first switch conduction element of conducting;
In the light emission period, the first switch conduction element and second switch breakover element end, and the 3rd switch conduction element conductive drives breakover element and flows through and the corresponding electric current of the data voltage of capacitor stores, and OLED carries out luminous.
Can before AMOLED display display image, carry out steps such as compensate for brightness inequality (MURA), image retention, but the corresponding step order can be not limited to above-mentioned statement order.
In order to make OLED not receive the influence of weak current; Concrete step is: when the viewdata signal that detects input when the light emission controller of compensating unit is minimum gray scale (being black level); Input ends the driving breakover element through corrected image data in the described amortization period; Light emission controller ends the 3rd switch conduction element through the light emitting control line in described light emission period, makes OLED send the electric current of the driving breakover element of faint half-light thereby cut off.
In the method for the invention, preferably each breakover element is transistor.Data in the described storer are to show the format of look-up table (LUT).
Test is learnt; AMOLED display of the present invention and driving method circuit structure thereof are simple; Help producing and implement; And can compensate the deviation of the heterogeneity of AMOLED display threshold voltage and electron mobility and the caused luminance non of threshold voltage shift and deviation; Significantly improve picture quality, can also compensate simultaneously OLED, can also compensate OLED self the display lighting brightness that is caused of degenerating and descend because of weak current and power lead impedance the deterioration in image quality that decay caused to voltage.
Below in conjunction with the embodiment of accompanying drawing illustrated embodiment, foregoing of the present invention is remake further detailed description.But should this be interpreted as that the scope of the above-mentioned theme of the present invention only limits to following instance.Do not breaking away under the above-mentioned technological thought situation of the present invention, various replacements or change according to ordinary skill knowledge and customary means are made all should comprise within the scope of the invention.
Description of drawings
Fig. 1 is the structured flowchart of AMOLED display of the present invention.
Fig. 2 is the circuit diagram of a pixel cell in the pel array of Fig. 1.
Fig. 3 is the drive waveforms of the pixel cell of AMOLED display drive method of the present invention.
Fig. 4 is the drive waveforms of AMOLED display of the present invention when showing minimum gray scale.
Embodiment
AMOLED display of the present invention as shown in Figure 1; Have the line driver and the row driver that connect pel array; Also has compensating unit; In compensating unit, be provided with the time schedule controller of reception viewdata signal Data1 and clock signal C lock thereof, synchronizing signal Hs/Vs, described time schedule controller is connected with described row driver through superimposer, and time schedule controller also is connected with light emission controller with line driver simultaneously; Storer, A/D converter and I/V converter that the input end of said superimposer also is linked in sequence and has demonstration look-up table (LUT).The I/V converter of compensating unit is used to receive the detection electric current of pixel cell and be converted into voltage, and A/D converter is used for converting aanalogvoltage into digital voltage so that be stored in storer.
As shown in Figure 2, pel array is made up of pixel cell, and each pixel cell is compared with traditional structure, has only increased the 3rd switch conduction elements T 3, second switch breakover element T4 and the detection line Det, the light emitting control line EM that are the PMOS transistor arrangement.Pixel unit circuit has adopted the least possible element, and the control linkage relation is simple, helps producing and implements.The source electrode that is the first switch conduction elements T 1 of PMOS transistor arrangement in the pixel cell is connected the data line of row driver and the grid of driving breakover element T2 respectively with drain electrode; The source electrode that drives breakover element T2 is connected (equiva lent impedance that Rs representes power lead among Fig. 2) with power vd D.Between the control pin of source electrode that drives breakover element T2 and driving breakover element T2, be connected with capacitor Cs; The first switch conduction elements T 1 and the grid of second switch breakover element T4 are connected the sweep trace of line driver simultaneously, receive line scan signals Scan; The source electrode of second switch breakover element T4 is connected in the 3rd node N3 with the drain electrode that drives breakover element T2, and the drain electrode of second switch breakover element T4 is connected to the I/V converter and the A/D converter of compensating unit through detection line Det; The positive pole of OLED is connected with the 3rd node N3.
The grid that is all the 3rd switch conduction elements T 3 of PMOS transistor arrangement in the pixel cell is connected with described light emission controller through light emitting control line EM; Receive the control signal of light emission controller, the positive pole of said OLED is connected with the 3rd node N3 with source electrode through the drain electrode of the 3rd switch conduction elements T 3.
The groundwork process of AMOLED display shown in Figure 1 is; Viewdata signal Data1, clock signal C lock and synchronizing signal Hs/Vs send in the time schedule controller of compensating unit, and time schedule controller control line driver output line scan signals Scan carries out addressing line by line to the pixel cell of pel array.The view data superposed signal Data2 corresponding with sweep signal Scan sequential is through the data line Data of row driver input pixel cell, and the OLED of pixel cell sends corresponding light according to the size of the signal of data line Data input.
Specifically; By the treatment for correcting that the view data superposed signal Data2 of row driver input pixel cell has passed through superimposer at compensating unit, superimposer will be imported among the demonstration look-up table LUT of original viewdata signal Data1 of AMOLED display and storer the image stored offset data and carry out sum operation and obtain Data2.Since in the look-up table image stored offset data be according to detection line Det to threshold voltage, mobility and the power lead impedance of the driving breakover element T2 of pixel cell PMOS to the monitoring of the decay of supply voltage, the degree of degeneration of OLED etc. and calculate; Therefore after the stack compensation; OLED just can send the light with the original corresponding object brightness of viewdata signal Data1; And with threshold voltage, mobility, power lead impedance the decay and the OLED degree of degeneration of supply voltage have been had nothing to do, and then the phenomenons such as brightness irregularities (MURA) and image retention of having eliminated the AMOLED display are to obtain the image of high-quality.
Further; The light emission controller of compensating unit is when the corresponding minimum gray scale of the viewdata signal Data1 that detects input (being black level); Turn-off the 3rd switch conduction elements T 3 of pixel cell through light emitting control line EM output control signal, thereby eliminated the problem that OLED can not truly reappear pitch black image because of the leakage current of the driving breakover element T2 of PMOS structure.
Drive waveforms figure as shown in Figure 3, whole driving method are divided into the first detection period P1, the second detection period P2, amortization period P3 and light emission period P4.
The first detection period P1 is used to detect and calculate the pressure drop of the threshold voltage that drives breakover element T2, electron mobility, power lead equiva lent impedance: in t1～t4 time period of Fig. 3; Be the first detection period P1; Wherein at t1～t2 in the time period; Line driver is to the sweep trace Scan output low level of the pixel cell of certain row; The first switch conduction elements T 1 and the second switch breakover element T4 conducting of PMOS structure, the data-signal Data2 of row driver output is input to the first switch conduction elements T 1 through the data line Data of pixel cell, and is delivered to node N1 and is preserved by capacitor C s; In this period, the light emitting control line EM input high level of pixel cell, the 3rd switch conduction elements T 3 is ended, and OLED is not luminous because of there not being electric current to flow through; The electric current that drives breakover element T2 source, drain electrode is fed back the I/V converter of input offset device by detection line Det through the second switch breakover element T4 of conducting; The I/V converter is a voltage with this current conversion; Send into A/D converter then and further convert digital voltage signal into and send into the storer preservation, be used for the computed image offset data.Voltage difference between node N1 and the node N2 has determined to flow through the electric current I that drives breakover element T2 source, drain electrode
DSize (promptly flowing to the size of current of node N3) from node N2, computing formula is following:
I
D=ημ(V
data－V
N2－Vth)
2 （1）
The serve as reasons channel dimensions that drives breakover element T2 and the parameter of gate insulator layer capacitance decision of η wherein, μ is for driving the electron mobility of breakover element T2, and Vth is the threshold voltage of transistor T 2, V
DataFor be input to the voltage data signal of node N1 through the data line Data of pixel cell.V wherein
N2Computing formula following:
V
N2＝VDD－V
RS （2）
Wherein VDD is the supply voltage of pixel cell, V
RSBe the pressure drop of supply voltage VDD on power lead equiva lent impedance Rs.Can get formula (3) by formula (1), (2):
I
D=ημ(V
data－VDD＋V
RS－Vth)
2（3）
Can know by formula (3), suitably the data voltage V of adjustment input
Data(be designated as V
D0), when current detecting and the I/V converter through second switch breakover element T4, the output voltage of A/D converter is just greater than zero the time, and the gate source voltage that drives breakover element T2 just equals threshold voltage and conducting, with data voltage V at this moment
D0Depositing storer and can obtaining in, to drive the computing formula of breakover element T2 threshold voltage vt h following:
Vth=V
d0－VDD＋V
RS（4）
In t2～t3 time period of Fig. 3; Sweep trace Scan output low level; The first switch conduction elements T 1 and second switch breakover element T4 conducting, light emitting control line EM exports high level, and the 3rd switch conduction elements T 3 is ended; Arbitrary magnitude of voltage between the light of minimum brightness and high-high brightness is sent in data line Data input, and (present embodiment is selected the corresponding data voltage value of 50% high-high brightness, is designated as V between OLED
D50), at this moment through the detection feedback of second switch breakover element T4, the A/D converter of compensator will be exported and data voltage V
D50Corresponding data current I
D50, and deposit storer in:
I
D50=ημ(V
d50－VDD＋V
RS－Vth)
2（5）
In t3～t4 time period of Fig. 3; Sweep trace Scan output low level; The first switch conduction elements T 1 and second switch breakover element T4 conducting, light emitting control line EM exports high level, and the 3rd switch conduction elements T 3 is ended; OLED is not luminous, and the corresponding data voltage value of light that data line Data input OLED sends high-high brightness (is designated as V
D100), at this moment through the detection feedback of second switch breakover element T4, the A/D converter of compensator will be exported and data voltage V
D100Corresponding data current I
D100, and deposit storer in:
I
D100=ημ(V
d100－VDD＋V
RS－Vth)
2（6）
Can calculate the pressure drop V of the threshold voltage vt h, electron mobility μ and the power lead equiva lent impedance that drive breakover element T2 by formula (4), (5), (6)
RS, and deposit these three values in storer.Above-mentioned pressure drop V to the threshold voltage vt h, electron mobility μ and the power lead equiva lent impedance Rs that drive breakover element T2
RSDetection, both can be in the frame period that image shows or other schedule time of confirming automatically carry out, also can carry out at user's setting-up time.
The second detection period P2 is used to detect degree of degeneration and calculatings of OLED need be to the compensation rate of the view data imported: in t4～t5 time period of Fig. 3, be the second detection period P2.Sweep trace Scan output low level; The first switch conduction elements T 1 and second switch breakover element T4 conducting; Light emitting control line EM output low level; 3 conductings of the 3rd switch conduction elements T; The arbitrary magnitude of voltage (present embodiment is selected the corresponding data voltage value of 50% high-high brightness) between the light of minimum brightness and high-high brightness is sent in data line Data input between OLED, this moment, OLED was luminous because of electric current flows through, and the anode voltage of OLED feeds back with second switch breakover element T4 through the 3rd switch conduction elements T 3 of conducting and is input to the A/D converter of compensator and deposits storer in.When OLED degenerates, its resistance will increase, and the anode voltage that makes OLED also increases accordingly, be stored in the degree of degeneration that OLED anode voltage in the storer has just reflected OLED like this.To the detection of OLED degree of degeneration, can power on or other user's setting-up times execution in the start just of AMOLED display.
Pressure drop V according to threshold voltage vt h, electron mobility μ and the power lead equiva lent impedance of the driving breakover element T2 that stores in the storer
RSJust can calculate the view data that the AMOLED display of sening as an envoy to sends the required actual input of light of expectation brightness according to formula (3), these data are exactly the pressure drop V to threshold voltage vt h, electron mobility μ and the power lead equiva lent impedance of breakover element T2 with the difference of expection input data
RSRequired compensation rate.Situation of change according to the anode voltage of the reflection OLED degree of degeneration of storing in the storer; Just can draw corresponding driving current compensation amount, just can calculate corresponding input compensation data amount according to formula (3) again according to I-V-L (current-voltage-brightness) characteristic of OLED.So far, just calculated and to have realized that AMOLED display object brightness need be to the compensation rate of the view data of input.The compensation rate of each pixel cell is deposited in the demonstration look-up table LUT of storer; As long as offset data corresponding in the view data that when actual displayed drives, will import the AMOLED display and the look-up table is in the superimposer addition; Data input pixel cell after proofreading and correct with this, OLED just can be realized the pressure drop V with the threshold voltage vt h of driving transistors, electron mobility μ, power lead equiva lent impedance
RSReach the irrelevant desired brightness of changing factor such as Organic Light Emitting Diode OLED degree of degeneration, thereby obtain the image of high-quality.
In t5～t6 time period of Fig. 3, be compensation data phase P3.Sweep trace Scan output low level; The first switch conduction elements T 1 and second switch breakover element T4 conducting; Light emitting control line EM exports high level, and the 3rd switch conduction elements T 3 is ended, and OLED is not luminous; Data line Data imports through compensator corrected image data signal Data2, and charges to holding capacitor Cs through the first switch conduction elements T 1 of conducting.
The t6 of Fig. 3～t7 time period is light emission period P4.Sweep trace Scan exports high level; The first switch conduction elements T 1 is ended with second switch breakover element T4; Light emitting control line EM output low level; 3 conductings of the 3rd switch conduction elements T, the source-drain electrode that drives breakover element T2 flows through the corresponding electric current of storing with capacitor Cs of data voltage, and OLED sends the light of expectation brightness.
Drive waveforms figure when Fig. 4 shows viewdata signal Data1 that light emission controller when compensator detects input AMOLED display and is minimum gray scale (being black level).This moment is on the one hand at the data line Data input process corrected image data signal Data2 of amortization period P3 through pixel cell; Driving breakover element T2 is ended; On the other hand at light emission period P4; Light emission controller ends the 3rd switch conduction elements T 3 through light emitting control line EM output high level, sends the problem that faint half-light causes truly reappearing pitch black image thereby further improve because of the leakage current that drives breakover element T2 flows through OLED.
Method of the present invention can before AMOLED display display image, carry out the step that is used for phenomenons such as compensate for brightness inequality (MURA), image retention, but execution sequence is fit to but is not limited only to present embodiment order said and shown in Figure 3.
Oscillogram shown in the present embodiment is the circuit to the pixel cell shown in Figure 2 that is made up of the PMOS transistor, when the transistor of pixel unit circuit is when being made up of nmos pass transistor, and the reversal of poles of oscillogram.
Claims (10)
1.AMOLED display has the line driver and the row driver that connect pel array, its characteristic comprises:
Also have compensating unit, in compensating unit, be provided with the time schedule controller of receiving inputted signal, described time schedule controller is connected with described row driver through superimposer, and time schedule controller also is connected with line driver simultaneously; The input end of said superimposer also be linked in sequence storer, A/D converter and I/V converter;
Pel array is made up of pixel cell; Comprise the first switch conduction element (T1) and second switch breakover element (T4) in each pixel cell; And driving breakover element (T2), two data conducting pin of the first switch conduction element (T1) connect the data line and the control pin that drives breakover element (T2) of row driver respectively; Be connected with capacitor (Cs) between the control pin of the power supply input pin of driving breakover element (T2) and driving breakover element (T2); The first switch conduction element (T1) and the control pin of second switch breakover element (T4) are connected the sweep trace of line driver simultaneously; The input pin of second switch breakover element (T4) is connected in the 3rd node (N3) with the output pin that drives breakover element (T2), and the output pin of second switch breakover element (T4) is connected to the I/V converter and the A/D converter of compensating unit through detection line (Det); The positive pole of OLED is connected with said the 3rd node (N3).
2. AMOLED display as claimed in claim 1 is characterized by: the output terminal of the time schedule controller of compensating unit also is connected with light emission controller; Also has the 3rd switch conduction element (T3) in the said pixel cell; The control pin of the 3rd switch conduction element (T3) is connected with described light emission controller through light emitting control line (EM); Receive the control signal of light emission controller, the positive pole of said OLED is connected with described the 3rd node (N3) with input pin through the output pin of the 3rd switch conduction element (T3).
3. according to claim 1 or claim 2 AMOLED display, it is characterized by: described storer is to have the storer that shows look-up table.
4. according to claim 1 or claim 2 AMOLED display, it is characterized by: described each breakover element is transistor.
5. the driving method that is used for the said AMOLED display of claim 1; It is characterized by: the time schedule controller of compensating unit receives the input signal that comprises viewdata signal; Time schedule controller control line driver output line scan signals is carried out addressing line by line to the pixel cell of pel array; Described viewdata signal carries out correction process through superimposer; Superimposer carries out sum operation with image stored offset data in viewdata signal and the storer and obtains the view data superposed signal; After the data input pin input of pixel cell, the OLED of pixel cell sends corresponding brightness according to the size of the view data superposed signal of input to described view data superposed signal through row driver.
6. like the driving method of the said AMOLED display of claim 5, it is characterized by:
The output terminal of the time schedule controller of compensating unit is connected with light emission controller; Have the 3rd switch conduction element (T3) in the described pixel cell, light emission controller is delivered to control signal in the pixel cell through the control pin of the 3rd switch conduction element (T3); The positive pole of OLED is connected with the 3rd node (N3) with input pin through the output pin of the 3rd switch conduction element (T3);
When the viewdata signal that detects input when light emission controller corresponded to minimum gray scale, the control signal of the 3rd switch conduction element (T3) of pixel cell was turn-offed in output.
7. like the driving method of the said AMOLED display of claim 6, it is characterized by: described driving method is divided into first detection period, second detection period, amortization period and light emission period;
First detection period is used for detecting and calculate the pressure drop of the threshold voltage that drives breakover element (T2), electron mobility, power lead equiva lent impedance: with the first switch conduction element (T1) and second switch breakover element (T4) conducting, the 3rd switch conduction element (T3) ends through compensating unit and line driver; Detect respectively make OLED just luminous, send arbitrary intermediate luminance light and send the high-high brightness light time, drive the electric current of breakover element (T2), this electric current feeds back to the I/V converter after store behind the A/D converter by detection line (Det); According to the detection electric current of storage, calculate the also pressure drop of threshold voltage, electron mobility and the power lead equiva lent impedance of storing driver breakover element (T2);
Second detection period is used to detect degree of degeneration and calculatings of OLED need be to the compensation rate of the view data of input: with the 3rd switch conduction element (T3) conducting, storage warp first switch conduction element (T1) and second switch breakover element (T4) feed back to the anode voltage value of the reflection OLED degree of degeneration of A/D converter; According to threshold voltage, electron mobility, the pressure drop of power lead equiva lent impedance and the voltage of reflection OLED degree of degeneration of the driving breakover element (T2) of storage, calculate and storage need be to the compensation rate of the view data imported;
In amortization period; The first switch conduction element (T1) and second switch breakover element (T4) conducting; The 3rd switch conduction element (T3) ends; Make OLED not luminous, compensating unit is imported through compensator corrected image data signal to pixel cell, and charges to capacitor (Cs) through the first switch conduction element (T1) of conducting;
In the light emission period; The first switch conduction element (T1) and second switch breakover element (T4) end; The 3rd switch conduction element (T3) conducting drives breakover element (T2) and flows through the corresponding electric current of storing with capacitor (Cs) of data voltage, and OLED carries out luminous.
8. like the driving method of the said AMOLED display of claim 7; It is characterized by: when the viewdata signal that detects input when the light emission controller of compensating unit is minimum gray scale; Input ends driving breakover element (T2) through corrected image data in the described amortization period; Light emission controller ends the 3rd switch conduction element (T3) through light emitting control line (EM) in described light emission period, makes OLED send the electric current of the driving breakover element (T2) of faint half-light thereby cut off.
9. like the driving method of the said AMOLED display of one of claim 6 to 8, it is characterized by: described each breakover element is transistor.
10. like the driving method of the said AMOLED display of one of claim 5 to 8, it is characterized by: the data in the described storer are to show the format of look-up table.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210278780.7A CN102768821B (en) | 2012-08-07 | 2012-08-07 | AMOLED (active matrix/organic light emitting diode) display and driving method of AMOLED display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210278780.7A CN102768821B (en) | 2012-08-07 | 2012-08-07 | AMOLED (active matrix/organic light emitting diode) display and driving method of AMOLED display |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102768821A true CN102768821A (en) | 2012-11-07 |
| CN102768821B CN102768821B (en) | 2015-02-18 |
Family
ID=47096205
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210278780.7A Expired - Fee Related CN102768821B (en) | 2012-08-07 | 2012-08-07 | AMOLED (active matrix/organic light emitting diode) display and driving method of AMOLED display |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102768821B (en) |
Cited By (33)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103093724A (en) * | 2013-03-04 | 2013-05-08 | 陈鑫 | Novel active matrix/organic light emitting diode (AMOLED) pixel driving circuit |
| CN103280188A (en) * | 2013-06-14 | 2013-09-04 | 电子科技大学 | Aging compensation system and method of OLED device |
| CN103400547A (en) * | 2013-07-30 | 2013-11-20 | 上海交通大学 | AMOLED direct electric signal mixing feedback circuit and driving method thereof |
| CN104064141A (en) * | 2014-06-12 | 2014-09-24 | 京东方科技集团股份有限公司 | Display panel optical compensation device, display panel and optical compensation method |
| CN104252846A (en) * | 2014-10-11 | 2014-12-31 | 成都晶砂科技有限公司 | Self-checking driving method of OLED (organic light emitting diode) display |
| CN104637447A (en) * | 2015-02-06 | 2015-05-20 | 京东方科技集团股份有限公司 | Data drive circuit, electric compensation method, array substrate and display device |
| CN105023539A (en) * | 2015-07-10 | 2015-11-04 | 北京大学深圳研究生院 | Peripheral compensation system and method of pixel matrix and display system |
| CN105247603A (en) * | 2013-06-27 | 2016-01-13 | 夏普株式会社 | Display device and drive method for same |
| CN105304022A (en) * | 2015-11-27 | 2016-02-03 | 上海天马有机发光显示技术有限公司 | AMOLED display apparatus |
| CN105788520A (en) * | 2014-09-10 | 2016-07-20 | 乐金显示有限公司 | Organic light emitting display device |
| CN106531045A (en) * | 2015-09-11 | 2017-03-22 | 三星电子株式会社 | Timing controller and display device comprising same |
| CN106847185A (en) * | 2015-11-11 | 2017-06-13 | 株式会社日本有机雷特显示器 | Display device, the bearing calibration of display device, manufacture method and display methods |
| CN107016965A (en) * | 2017-05-26 | 2017-08-04 | 深圳市华星光电技术有限公司 | The compensation method of the OVSS voltage drops of OLED display and pixel-driving circuit |
| CN107068049A (en) * | 2017-06-07 | 2017-08-18 | 京东方科技集团股份有限公司 | Image display drive apparatus, display device and electric compensation method |
| CN107230454A (en) * | 2017-07-11 | 2017-10-03 | 深圳市华星光电技术有限公司 | Display device and its driving method |
| CN107331346A (en) * | 2017-08-18 | 2017-11-07 | 深圳市华星光电半导体显示技术有限公司 | Brightness regulating apparatus and brightness adjusting method, the display device of display device |
| CN107393481A (en) * | 2017-08-23 | 2017-11-24 | 京东方科技集团股份有限公司 | Organic Light Emitting Diode OLED life-span aging method and system |
| CN108269532A (en) * | 2018-01-19 | 2018-07-10 | 友达光电股份有限公司 | Display device |
| CN108269537A (en) * | 2016-12-30 | 2018-07-10 | 乐金显示有限公司 | Organic light-emitting diode (OLED) display apparatus |
| CN109036290A (en) * | 2018-09-04 | 2018-12-18 | 京东方科技集团股份有限公司 | Pixel-driving circuit, driving method and display device |
| CN109377944A (en) * | 2018-10-30 | 2019-02-22 | 京东方科技集团股份有限公司 | Pixel-driving circuit, display panel and its driving method and display device |
| CN109389938A (en) * | 2017-08-09 | 2019-02-26 | 乐金显示有限公司 | Organic light-emitting display device and its driving method and controller |
| CN110246462A (en) * | 2019-07-26 | 2019-09-17 | 云谷（固安）科技有限公司 | A kind of pixel circuit and its driving method, display device and its driving method |
| CN110491340A (en) * | 2019-07-25 | 2019-11-22 | 北京大学深圳研究生院 | Micro display pixel arrangement, micro display device and compensation method |
| WO2020107981A1 (en) * | 2018-11-29 | 2020-06-04 | 昆山工研院新型平板显示技术中心有限公司 | Pixel circuit, display device and drive method for pixel circuit |
| WO2020140277A1 (en) * | 2019-01-04 | 2020-07-09 | 京东方科技集团股份有限公司 | Method for compensating uneven brightness of display apparatus, and corresponding display apparatus |
| CN113781971A (en) * | 2021-08-05 | 2021-12-10 | 合肥维信诺科技有限公司 | Display panel driving method and display panel |
| CN113838384A (en) * | 2020-06-05 | 2021-12-24 | 广州市浩洋电子股份有限公司 | Special-shaped display screen, special-shaped pixel lamp and control method of special-shaped pixel lamp |
| CN113936591A (en) * | 2021-11-01 | 2022-01-14 | 四川启睿克科技有限公司 | Display device driving circuit and driving method thereof |
| CN114203111A (en) * | 2021-12-27 | 2022-03-18 | 合肥维信诺科技有限公司 | Display device and driving method thereof |
| WO2022061998A1 (en) * | 2020-09-28 | 2022-03-31 | 北京大学深圳研究生院 | Feedback signal detection method and pixel external analog domain compensation display system |
| CN114783354A (en) * | 2022-03-29 | 2022-07-22 | 厦门凌阳华芯科技有限公司 | Color cast compensation method, architecture and medium |
| US11600226B2 (en) | 2020-07-30 | 2023-03-07 | Samsung Display Co., Ltd. | Display device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1804976A (en) * | 2004-12-24 | 2006-07-19 | 三星Sdi株式会社 | Data driving circuit, organic light emitting diode display using the same, and method of driving the organic light emitting diode display |
| CN1909043A (en) * | 2005-08-01 | 2007-02-07 | 三星Sdi株式会社 | Data driving circuit and driving method of organic light emitting display using the same |
| CN1909047A (en) * | 2005-08-01 | 2007-02-07 | 三星Sdi株式会社 | Data driving circuits and organic light emitting diode display using the same |
| CN101194300A (en) * | 2005-04-12 | 2008-06-04 | 伊格尼斯创新有限公司 | Method and system for compensation of non-uniformities in light emitting device displays |
| CN101488320A (en) * | 2008-01-18 | 2009-07-22 | 三星移动显示器株式会社 | Organic light emitting display and driving method thereof |
| CN101488319A (en) * | 2008-01-18 | 2009-07-22 | 三星移动显示器株式会社 | Organic light emitting display and driving method thereof |
-
2012
- 2012-08-07 CN CN201210278780.7A patent/CN102768821B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1804976A (en) * | 2004-12-24 | 2006-07-19 | 三星Sdi株式会社 | Data driving circuit, organic light emitting diode display using the same, and method of driving the organic light emitting diode display |
| CN101194300A (en) * | 2005-04-12 | 2008-06-04 | 伊格尼斯创新有限公司 | Method and system for compensation of non-uniformities in light emitting device displays |
| CN1909043A (en) * | 2005-08-01 | 2007-02-07 | 三星Sdi株式会社 | Data driving circuit and driving method of organic light emitting display using the same |
| CN1909047A (en) * | 2005-08-01 | 2007-02-07 | 三星Sdi株式会社 | Data driving circuits and organic light emitting diode display using the same |
| CN101488320A (en) * | 2008-01-18 | 2009-07-22 | 三星移动显示器株式会社 | Organic light emitting display and driving method thereof |
| CN101488319A (en) * | 2008-01-18 | 2009-07-22 | 三星移动显示器株式会社 | Organic light emitting display and driving method thereof |
Cited By (52)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103093724A (en) * | 2013-03-04 | 2013-05-08 | 陈鑫 | Novel active matrix/organic light emitting diode (AMOLED) pixel driving circuit |
| CN103280188B (en) * | 2013-06-14 | 2015-09-02 | 电子科技大学 | OLED compensation of ageing system and method |
| CN103280188A (en) * | 2013-06-14 | 2013-09-04 | 电子科技大学 | Aging compensation system and method of OLED device |
| CN105247603B (en) * | 2013-06-27 | 2017-07-11 | 夏普株式会社 | Display device and its driving method |
| CN105247603A (en) * | 2013-06-27 | 2016-01-13 | 夏普株式会社 | Display device and drive method for same |
| CN103400547A (en) * | 2013-07-30 | 2013-11-20 | 上海交通大学 | AMOLED direct electric signal mixing feedback circuit and driving method thereof |
| CN103400547B (en) * | 2013-07-30 | 2015-07-01 | 上海交通大学 | AMOLED direct electric signal mixing feedback circuit and driving method thereof |
| CN104064141A (en) * | 2014-06-12 | 2014-09-24 | 京东方科技集团股份有限公司 | Display panel optical compensation device, display panel and optical compensation method |
| US9715850B2 (en) | 2014-06-12 | 2017-07-25 | Boe Technology Group Co., Ltd. | Display panel optical compensating apparatus, display panel and display panel optical compensating method |
| WO2015188605A1 (en) * | 2014-06-12 | 2015-12-17 | 京东方科技集团股份有限公司 | Optical compensation device of display panel, display panel, and optical compensation method for display panel |
| CN104064141B (en) * | 2014-06-12 | 2016-12-14 | 京东方科技集团股份有限公司 | Display floater optical compensating member, display floater and optical compensation method |
| CN105788520A (en) * | 2014-09-10 | 2016-07-20 | 乐金显示有限公司 | Organic light emitting display device |
| CN104252846A (en) * | 2014-10-11 | 2014-12-31 | 成都晶砂科技有限公司 | Self-checking driving method of OLED (organic light emitting diode) display |
| CN104637447A (en) * | 2015-02-06 | 2015-05-20 | 京东方科技集团股份有限公司 | Data drive circuit, electric compensation method, array substrate and display device |
| WO2017008329A1 (en) * | 2015-07-10 | 2017-01-19 | 北京大学深圳研究生院 | Peripheral compensation system and method for pixel matrix, and display system |
| CN105023539A (en) * | 2015-07-10 | 2015-11-04 | 北京大学深圳研究生院 | Peripheral compensation system and method of pixel matrix and display system |
| CN105023539B (en) * | 2015-07-10 | 2017-11-28 | 北京大学深圳研究生院 | Offset peripheral system, method and the display system of a kind of picture element matrix |
| CN106531045A (en) * | 2015-09-11 | 2017-03-22 | 三星电子株式会社 | Timing controller and display device comprising same |
| CN106847185A (en) * | 2015-11-11 | 2017-06-13 | 株式会社日本有机雷特显示器 | Display device, the bearing calibration of display device, manufacture method and display methods |
| TWI717414B (en) * | 2015-11-11 | 2021-02-01 | 日商日本有機雷特顯示器股份有限公司 | Display device, display device correction method, display device manufacturing method, and display device display method |
| CN106847185B (en) * | 2015-11-11 | 2020-10-23 | 株式会社日本有机雷特显示器 | Display device, correction method of display device, manufacturing method of display device, and display method |
| CN105304022A (en) * | 2015-11-27 | 2016-02-03 | 上海天马有机发光显示技术有限公司 | AMOLED display apparatus |
| US10847086B2 (en) | 2016-12-30 | 2020-11-24 | Lg Display Co., Ltd. | Organic light-emitting diode display device |
| CN108269537A (en) * | 2016-12-30 | 2018-07-10 | 乐金显示有限公司 | Organic light-emitting diode (OLED) display apparatus |
| CN107016965A (en) * | 2017-05-26 | 2017-08-04 | 深圳市华星光电技术有限公司 | The compensation method of the OVSS voltage drops of OLED display and pixel-driving circuit |
| CN107068049B (en) * | 2017-06-07 | 2020-05-29 | 京东方科技集团股份有限公司 | Image display driving device, display device and electrical compensation method |
| US11227541B2 (en) | 2017-06-07 | 2022-01-18 | Boe Technology Group Co., Ltd. | Image display drive device, display device and electrical compensation method |
| CN107068049A (en) * | 2017-06-07 | 2017-08-18 | 京东方科技集团股份有限公司 | Image display drive apparatus, display device and electric compensation method |
| WO2019010855A1 (en) * | 2017-07-11 | 2019-01-17 | 深圳市华星光电半导体显示技术有限公司 | Display device and driving method therefor |
| CN107230454A (en) * | 2017-07-11 | 2017-10-03 | 深圳市华星光电技术有限公司 | Display device and its driving method |
| CN109389938A (en) * | 2017-08-09 | 2019-02-26 | 乐金显示有限公司 | Organic light-emitting display device and its driving method and controller |
| CN107331346A (en) * | 2017-08-18 | 2017-11-07 | 深圳市华星光电半导体显示技术有限公司 | Brightness regulating apparatus and brightness adjusting method, the display device of display device |
| US10810941B2 (en) | 2017-08-18 | 2020-10-20 | Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd. | Brightness regulation device of display device, brightness regulation method and display device |
| CN107393481A (en) * | 2017-08-23 | 2017-11-24 | 京东方科技集团股份有限公司 | Organic Light Emitting Diode OLED life-span aging method and system |
| CN108269532A (en) * | 2018-01-19 | 2018-07-10 | 友达光电股份有限公司 | Display device |
| CN108269532B (en) * | 2018-01-19 | 2021-01-01 | 友达光电股份有限公司 | Display device |
| CN109036290A (en) * | 2018-09-04 | 2018-12-18 | 京东方科技集团股份有限公司 | Pixel-driving circuit, driving method and display device |
| CN109377944A (en) * | 2018-10-30 | 2019-02-22 | 京东方科技集团股份有限公司 | Pixel-driving circuit, display panel and its driving method and display device |
| US11282436B2 (en) | 2018-11-29 | 2022-03-22 | Chengdu Vistar Optoelectronics Co., Ltd. | Pixel circuit including a storage device connected to a control line, display device and method for driving pixel circuit |
| WO2020107981A1 (en) * | 2018-11-29 | 2020-06-04 | 昆山工研院新型平板显示技术中心有限公司 | Pixel circuit, display device and drive method for pixel circuit |
| US11127356B2 (en) | 2019-01-04 | 2021-09-21 | Chengdu Boe Optoelectronics Technology Co., Ltd. | Method for compensating brightness unevenness of a display device and related display device |
| WO2020140277A1 (en) * | 2019-01-04 | 2020-07-09 | 京东方科技集团股份有限公司 | Method for compensating uneven brightness of display apparatus, and corresponding display apparatus |
| CN110491340A (en) * | 2019-07-25 | 2019-11-22 | 北京大学深圳研究生院 | Micro display pixel arrangement, micro display device and compensation method |
| CN110246462A (en) * | 2019-07-26 | 2019-09-17 | 云谷（固安）科技有限公司 | A kind of pixel circuit and its driving method, display device and its driving method |
| CN113838384A (en) * | 2020-06-05 | 2021-12-24 | 广州市浩洋电子股份有限公司 | Special-shaped display screen, special-shaped pixel lamp and control method of special-shaped pixel lamp |
| US11600226B2 (en) | 2020-07-30 | 2023-03-07 | Samsung Display Co., Ltd. | Display device |
| WO2022061998A1 (en) * | 2020-09-28 | 2022-03-31 | 北京大学深圳研究生院 | Feedback signal detection method and pixel external analog domain compensation display system |
| CN113781971A (en) * | 2021-08-05 | 2021-12-10 | 合肥维信诺科技有限公司 | Display panel driving method and display panel |
| CN113936591A (en) * | 2021-11-01 | 2022-01-14 | 四川启睿克科技有限公司 | Display device driving circuit and driving method thereof |
| CN114203111A (en) * | 2021-12-27 | 2022-03-18 | 合肥维信诺科技有限公司 | Display device and driving method thereof |
| CN114783354A (en) * | 2022-03-29 | 2022-07-22 | 厦门凌阳华芯科技有限公司 | Color cast compensation method, architecture and medium |
| CN114783354B (en) * | 2022-03-29 | 2024-02-27 | 厦门凌阳华芯科技股份有限公司 | Color cast compensation method, architecture and medium |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102768821B (en) | 2015-02-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102768821B (en) | AMOLED (active matrix/organic light emitting diode) display and driving method of AMOLED display | |
| CN102881257B (en) | Active organic light-emitting diode displayer and driving method thereof | |
| US10930728B2 (en) | Organic light-emitting diode display and method of manufacturing the same | |
| CN106205490B (en) | Organic light emitting display | |
| US9842546B2 (en) | Organic light emitting display device for improving a contrast ratio | |
| CN103137067B (en) | Organic LED display device and driving method thereof | |
| CN100520886C (en) | Pixel and light emitting display | |
| CN102047312B (en) | Image display apparatus and driving method therefor | |
| CN103080996B (en) | The driving method of display device | |
| CN102576513B (en) | Display device and method of controlling same | |
| CN106531075A (en) | Organic light-emitting pixel driving circuit, driving method and organic light-emitting display panel | |
| CN103500556B (en) | A kind of image element circuit and driving method, thin film transistor backplane | |
| CN106910457B (en) | Organic light-emitting display device and its sub-pixel including sub-pixel | |
| JP5415565B2 (en) | Display device and driving method thereof | |
| CN107424563A (en) | Organic LED display device | |
| CN103714778B (en) | Image element circuit, the driving method of image element circuit and display device | |
| WO2010137268A1 (en) | Image display device and method for driving same | |
| CN106910458B (en) | Organic light-emitting display device and its driving method and its sub-pixel | |
| CN102612710B (en) | Organic el display panel and driving method thereof | |
| CN102456318A (en) | Organic light emitting diode display device | |
| CN103971631A (en) | Organic light emitting display device and driving method thereof | |
| CN101689348A (en) | Display device and method for driving display device | |
| CN103198793A (en) | Pixel circuit, drive method and display device thereof | |
| CN104637446B (en) | Image element circuit and its driving method and a kind of display device | |
| CN102576512B (en) | Display device and method for controlling same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150218 Termination date: 20180807 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |