CA2535233A1 - Low-cost stable driving scheme for amoled displays - Google Patents
Low-cost stable driving scheme for amoled displays Download PDFInfo
- Publication number
- CA2535233A1 CA2535233A1 CA002535233A CA2535233A CA2535233A1 CA 2535233 A1 CA2535233 A1 CA 2535233A1 CA 002535233 A CA002535233 A CA 002535233A CA 2535233 A CA2535233 A CA 2535233A CA 2535233 A1 CA2535233 A1 CA 2535233A1
- Authority
- CA
- Canada
- Prior art keywords
- low
- pixel
- shows
- driving scheme
- stable driving
- 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.)
- Abandoned
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Classifications
-
- 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
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/60—Circuit arrangements for operating LEDs comprising organic material, e.g. for operating organic light-emitting diodes [OLED] or polymer light-emitting diodes [PLED]
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
- G09G2300/0809—Several active elements per pixel in active matrix panels
- G09G2300/0819—Several active elements per pixel in active matrix panels used for counteracting undesired variations, e.g. feedback or autozeroing
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
- G09G2300/0809—Several active elements per pixel in active matrix panels
- G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/04—Maintaining the quality of display appearance
- G09G2320/043—Preventing or counteracting the effects of ageing
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Abstract
Disclosed is a technique to provide a stable AMOLED display despite the instability of backplane and OLED.
Description
FIELD OF THE INVENTION
The present invention generally relates to a light emitting display devices, and particularly, to a driving technique for AMOLEDs, to reduce the effects of differential aging of the pixel circuits significantly.
SUMMARY OF INVENTION
The disclosed technique stabilizes the pixel current by adjusting the gate voltage of the drive transistor.
ADVANTAGES
The new technique does not require any more driving cycle or driving circuitry than the ones used in AMLCD displays, resulting in a low cost application for portable devices including mobiles and PDAs. Also, it is insensitive to the temperature change and mechanical stress.
FIG. I (a, b): shows two circuit diagrams for the new driving technique.
FIG. 2 (a, b): shows two circuit diagrams with modified discharging elements.
FIG. 3: shows the simulation results of FIG.I (a) with and without discharging effect.
FIG. 4 (a-c): shows two circuit diagrams with modified discharging method and corresponding signal diagram.
FIG. 5: shows the simulation results of FIG 4(a).
FIG. 5: shows the simulation results of FIG 4(b).
FIG. 1 shows two pixel circuits that can provide constant averaged current over the frame time.
The pixel circuits comprise a switch T2, a drive transistor T1, a discharging transistor Td, OLED
10, and a storage capacitor 11.
During the programming cycle, node A is charged to a programming voltage through T2 while SEL is high. During the drive cycle, node A is discharged through Td. Since Td and Tl has the same bias condition, they experience the same threshold voltage shift.
Considering that the discharge time is a function of transconductance of Td, the discharge time increases as the threshold voltage of T1/Td increases. Therefore, the average current of the pixel over the frame time remains constant. Td should be a very weak transistor with short width and long channel length.
In FIG. 1 (b), an increase in the OLED 10 voltage will result in longer discharge time. Thus, the averaged pixel current will remain constant even after the OLED degradation.
FIG. 2 shows two pixel circuits with modified discharging element. The pixel circuits comprise two switches T2 and T3, a drive transistor T1, a discharging transistor Td, OLED 20, and a storage capacitor 21.
During the programming cycle, node A is charged to a programming voltage through T2 while SEL is high. During the drive cycle, node A is discharged through Td. Since Td and T1 has the same bias condition, they experience the same threshold voltage shift.
Considering that the discharge time is a function of transconductance of Td, the discharge time increases as the threshold voltage of T1/Td increases. Therefore, the average current of the pixel over the frame time remains constant. Here, T3 forces Td in the linear regime of operation, and so reduce feedback gain. Therefore, Td can be a unity transistor with the minimum channel length and width. VB can be shared between the pixels of the entire panel or it can be connected to node A.
Also, T3 can be replaced by a resistor.
In FIG. 2 (b), an increase in the OLED 20 voltage will result in longer discharge time. Thus, the averaged pixel current will remain constant even after the OLED degradation.
FIG. 3 shows the simulation results for the pixel circuit proposed in FIG.
1(a). It is obvious that the averaged pixel current is stable for the new driving scheme whereas it drops dramatically if Td is removed from the circuit (conventional 2-TFT pixel circuit).
FIG. 4 shows two pixel circuits with modified discharging method. The pixel circuits comprise two switches T2 and T3, a drive transistor T1, a discharging transistor Td, OLED 40, and a storage capacitor 41.
During the programming cycle, node A is charged to a programming voltage through T2 while SEL[n] is high. During the second operating cycle, node A is discharged through Td. Since Td and T1 has the same bias condition, they experience the same threshold voltage shift.
Considering that the discharge time is a function of transconductance of Td, the discharged voltage decreases as the threshold voltage of T1/Td increases. Therefore, gate voltage of the drive transistor T1 is adjusted accordingly. Here, SEL [n] is the address line of the nth row, and SEL[n+1] is the address line of (n+1)th row.
In FIG. 4 (b), an increase in the OLED 40 voltage will result in higher gate voltage. Thus, the pixel current remains constant.
FIG. 5 shows the simulation results for the pixel circuit depicted in FIG. 4 (a). It is seen that the pixel current is highly stable even after a 2-V shift in the threshold voltage of the drive transistor T1.
FIG. 6 shows the simulation results for the pixel circuit depicted in FIG. 4 (b). It is seen that the pixel current is highly stable even after a 2-V shift in the voltage of the OLED 11.
The present invention generally relates to a light emitting display devices, and particularly, to a driving technique for AMOLEDs, to reduce the effects of differential aging of the pixel circuits significantly.
SUMMARY OF INVENTION
The disclosed technique stabilizes the pixel current by adjusting the gate voltage of the drive transistor.
ADVANTAGES
The new technique does not require any more driving cycle or driving circuitry than the ones used in AMLCD displays, resulting in a low cost application for portable devices including mobiles and PDAs. Also, it is insensitive to the temperature change and mechanical stress.
FIG. I (a, b): shows two circuit diagrams for the new driving technique.
FIG. 2 (a, b): shows two circuit diagrams with modified discharging elements.
FIG. 3: shows the simulation results of FIG.I (a) with and without discharging effect.
FIG. 4 (a-c): shows two circuit diagrams with modified discharging method and corresponding signal diagram.
FIG. 5: shows the simulation results of FIG 4(a).
FIG. 5: shows the simulation results of FIG 4(b).
FIG. 1 shows two pixel circuits that can provide constant averaged current over the frame time.
The pixel circuits comprise a switch T2, a drive transistor T1, a discharging transistor Td, OLED
10, and a storage capacitor 11.
During the programming cycle, node A is charged to a programming voltage through T2 while SEL is high. During the drive cycle, node A is discharged through Td. Since Td and Tl has the same bias condition, they experience the same threshold voltage shift.
Considering that the discharge time is a function of transconductance of Td, the discharge time increases as the threshold voltage of T1/Td increases. Therefore, the average current of the pixel over the frame time remains constant. Td should be a very weak transistor with short width and long channel length.
In FIG. 1 (b), an increase in the OLED 10 voltage will result in longer discharge time. Thus, the averaged pixel current will remain constant even after the OLED degradation.
FIG. 2 shows two pixel circuits with modified discharging element. The pixel circuits comprise two switches T2 and T3, a drive transistor T1, a discharging transistor Td, OLED 20, and a storage capacitor 21.
During the programming cycle, node A is charged to a programming voltage through T2 while SEL is high. During the drive cycle, node A is discharged through Td. Since Td and T1 has the same bias condition, they experience the same threshold voltage shift.
Considering that the discharge time is a function of transconductance of Td, the discharge time increases as the threshold voltage of T1/Td increases. Therefore, the average current of the pixel over the frame time remains constant. Here, T3 forces Td in the linear regime of operation, and so reduce feedback gain. Therefore, Td can be a unity transistor with the minimum channel length and width. VB can be shared between the pixels of the entire panel or it can be connected to node A.
Also, T3 can be replaced by a resistor.
In FIG. 2 (b), an increase in the OLED 20 voltage will result in longer discharge time. Thus, the averaged pixel current will remain constant even after the OLED degradation.
FIG. 3 shows the simulation results for the pixel circuit proposed in FIG.
1(a). It is obvious that the averaged pixel current is stable for the new driving scheme whereas it drops dramatically if Td is removed from the circuit (conventional 2-TFT pixel circuit).
FIG. 4 shows two pixel circuits with modified discharging method. The pixel circuits comprise two switches T2 and T3, a drive transistor T1, a discharging transistor Td, OLED 40, and a storage capacitor 41.
During the programming cycle, node A is charged to a programming voltage through T2 while SEL[n] is high. During the second operating cycle, node A is discharged through Td. Since Td and T1 has the same bias condition, they experience the same threshold voltage shift.
Considering that the discharge time is a function of transconductance of Td, the discharged voltage decreases as the threshold voltage of T1/Td increases. Therefore, gate voltage of the drive transistor T1 is adjusted accordingly. Here, SEL [n] is the address line of the nth row, and SEL[n+1] is the address line of (n+1)th row.
In FIG. 4 (b), an increase in the OLED 40 voltage will result in higher gate voltage. Thus, the pixel current remains constant.
FIG. 5 shows the simulation results for the pixel circuit depicted in FIG. 4 (a). It is seen that the pixel current is highly stable even after a 2-V shift in the threshold voltage of the drive transistor T1.
FIG. 6 shows the simulation results for the pixel circuit depicted in FIG. 4 (b). It is seen that the pixel current is highly stable even after a 2-V shift in the voltage of the OLED 11.
Claims
Priority Applications (17)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002535233A CA2535233A1 (en) | 2006-01-09 | 2006-01-09 | Low-cost stable driving scheme for amoled displays |
| PCT/CA2007/000013 WO2007079572A1 (en) | 2006-01-09 | 2007-01-05 | Method and system for driving an active matrix display circuit |
| EP07701644.2A EP1971975B1 (en) | 2006-01-09 | 2007-01-05 | Method and system for driving an active matrix display circuit |
| CA 2570898 CA2570898C (en) | 2006-01-09 | 2007-01-05 | Method and system for driving an active matrix display circuit |
| KR1020087019498A KR20090006057A (en) | 2006-01-09 | 2007-01-05 | Method and system for driving an active matrix display circuit |
| CN2007800077270A CN101395653B (en) | 2006-01-09 | 2007-01-05 | Method and display system for driving pixel circuit with luminous device |
| EP12156251.6A EP2458579B1 (en) | 2006-01-09 | 2007-01-05 | Method and system for driving an active matrix display circuit |
| JP2008549724A JP5164857B2 (en) | 2006-01-09 | 2007-01-05 | Driving method and display system for active matrix display circuit |
| TW096100837A TWI415067B (en) | 2006-01-09 | 2007-01-09 | Method and system for driving an active matrix display circuit |
| US11/651,099 US8253665B2 (en) | 2006-01-09 | 2007-01-09 | Method and system for driving an active matrix display circuit |
| US13/243,330 US8564513B2 (en) | 2006-01-09 | 2011-09-23 | Method and system for driving an active matrix display circuit |
| US13/413,517 US8624808B2 (en) | 2006-01-09 | 2012-03-06 | Method and system for driving an active matrix display circuit |
| US13/649,888 US9269322B2 (en) | 2006-01-09 | 2012-10-11 | Method and system for driving an active matrix display circuit |
| US14/095,583 US9058775B2 (en) | 2006-01-09 | 2013-12-03 | Method and system for driving an active matrix display circuit |
| US14/491,885 US10229647B2 (en) | 2006-01-09 | 2014-09-19 | Method and system for driving an active matrix display circuit |
| US14/993,174 US9489891B2 (en) | 2006-01-09 | 2016-01-12 | Method and system for driving an active matrix display circuit |
| US15/288,019 US10262587B2 (en) | 2006-01-09 | 2016-10-07 | Method and system for driving an active matrix display circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002535233A CA2535233A1 (en) | 2006-01-09 | 2006-01-09 | Low-cost stable driving scheme for amoled displays |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2535233A1 true CA2535233A1 (en) | 2007-07-09 |
Family
ID=38236303
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002535233A Abandoned CA2535233A1 (en) | 2006-01-09 | 2006-01-09 | Low-cost stable driving scheme for amoled displays |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN101395653B (en) |
| CA (1) | CA2535233A1 (en) |
Families Citing this family (28)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006130981A1 (en) | 2005-06-08 | 2006-12-14 | Ignis Innovation Inc. | Method and system for driving a light emitting device display |
| US9269322B2 (en) | 2006-01-09 | 2016-02-23 | Ignis Innovation Inc. | Method and system for driving an active matrix display circuit |
| US9370075B2 (en) | 2008-12-09 | 2016-06-14 | Ignis Innovation Inc. | System and method for fast compensation programming of pixels in a display |
| CA2687631A1 (en) * | 2009-12-06 | 2011-06-06 | Ignis Innovation Inc | Low power driving scheme for display applications |
| US9351368B2 (en) | 2013-03-08 | 2016-05-24 | Ignis Innovation Inc. | Pixel circuits for AMOLED displays |
| US20140368491A1 (en) | 2013-03-08 | 2014-12-18 | Ignis Innovation Inc. | Pixel circuits for amoled displays |
| US9886899B2 (en) | 2011-05-17 | 2018-02-06 | Ignis Innovation Inc. | Pixel Circuits for AMOLED displays |
| US9881587B2 (en) | 2011-05-28 | 2018-01-30 | Ignis Innovation Inc. | Systems and methods for operating pixels in a display to mitigate image flicker |
| US9747834B2 (en) | 2012-05-11 | 2017-08-29 | Ignis Innovation Inc. | Pixel circuits including feedback capacitors and reset capacitors, and display systems therefore |
| CN104813390B (en) * | 2012-10-11 | 2017-04-12 | 伊格尼斯创新公司 | Method and system for driving an active matrix display circuit |
| US9336717B2 (en) | 2012-12-11 | 2016-05-10 | Ignis Innovation Inc. | Pixel circuits for AMOLED displays |
| US9786223B2 (en) | 2012-12-11 | 2017-10-10 | Ignis Innovation Inc. | Pixel circuits for AMOLED displays |
| CA2894717A1 (en) | 2015-06-19 | 2016-12-19 | Ignis Innovation Inc. | Optoelectronic device characterization in array with shared sense line |
| US9721505B2 (en) | 2013-03-08 | 2017-08-01 | Ignis Innovation Inc. | Pixel circuits for AMOLED displays |
| JP2015008348A (en) * | 2013-06-24 | 2015-01-15 | 株式会社東芝 | Solid-state imaging device |
| DE112014005546T8 (en) * | 2013-12-05 | 2016-11-10 | Ignis Innovation Inc. | Charge-based compensation and parameter extraction in AMOLED displays |
| CN105225637B (en) * | 2014-06-18 | 2018-01-26 | 上海和辉光电有限公司 | A kind of pixel compensation circuit |
| CN105206222B (en) * | 2014-06-20 | 2018-06-19 | 上海和辉光电有限公司 | Oled pixel compensation circuit and oled pixel driving method |
| CA2873476A1 (en) | 2014-12-08 | 2016-06-08 | Ignis Innovation Inc. | Smart-pixel display architecture |
| CA2886862A1 (en) | 2015-04-01 | 2016-10-01 | Ignis Innovation Inc. | Adjusting display brightness for avoiding overheating and/or accelerated aging |
| US10373554B2 (en) | 2015-07-24 | 2019-08-06 | Ignis Innovation Inc. | Pixels and reference circuits and timing techniques |
| US10657895B2 (en) | 2015-07-24 | 2020-05-19 | Ignis Innovation Inc. | Pixels and reference circuits and timing techniques |
| CA2898282A1 (en) | 2015-07-24 | 2017-01-24 | Ignis Innovation Inc. | Hybrid calibration of current sources for current biased voltage progra mmed (cbvp) displays |
| CA2908285A1 (en) | 2015-10-14 | 2017-04-14 | Ignis Innovation Inc. | Driver with multiple color pixel structure |
| DE112017000341T5 (en) * | 2016-01-12 | 2018-09-20 | Ignis Innovation Inc. | Method and system for driving an active matrix display circuit |
| CN108255348B (en) * | 2018-01-29 | 2021-09-14 | 京东方科技集团股份有限公司 | Signal accumulation mode switching circuit and touch screen detection circuit |
| CN109872676A (en) * | 2019-04-22 | 2019-06-11 | 云谷（固安）科技有限公司 | A kind of digital drive pixel circuit and display device |
| CN111369936A (en) * | 2020-04-10 | 2020-07-03 | 深圳市华星光电半导体显示技术有限公司 | Light-emitting drive circuit, drive method thereof and display panel |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4126909B2 (en) * | 1999-07-14 | 2008-07-30 | ソニー株式会社 | Current drive circuit, display device using the same, pixel circuit, and drive method |
| TWI280532B (en) * | 2002-01-18 | 2007-05-01 | Semiconductor Energy Lab | Light-emitting device |
| JP4144462B2 (en) * | 2002-08-30 | 2008-09-03 | セイコーエプソン株式会社 | Electro-optical device and electronic apparatus |
| CA2438363A1 (en) * | 2003-08-28 | 2005-02-28 | Ignis Innovation Inc. | A pixel circuit for amoled displays |
-
2006
- 2006-01-09 CA CA002535233A patent/CA2535233A1/en not_active Abandoned
-
2007
- 2007-01-05 CN CN2007800077270A patent/CN101395653B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN101395653A (en) | 2009-03-25 |
| CN101395653B (en) | 2011-01-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |