WO2010038979A2 - Method for driving an ac type plasma display panel - Google Patents

Method for driving an ac type plasma display panel Download PDF

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Publication number
WO2010038979A2
WO2010038979A2 PCT/KR2009/005595 KR2009005595W WO2010038979A2 WO 2010038979 A2 WO2010038979 A2 WO 2010038979A2 KR 2009005595 W KR2009005595 W KR 2009005595W WO 2010038979 A2 WO2010038979 A2 WO 2010038979A2
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WO
WIPO (PCT)
Prior art keywords
display panel
plasma display
turned
type plasma
voltage
Prior art date
Application number
PCT/KR2009/005595
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English (en)
French (fr)
Other versions
WO2010038979A3 (en
Inventor
Pil Soo Kim
Min Seob Shim
Min Su Kang
Original Assignee
Orion Pdp Co., Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Orion Pdp Co., Ltd filed Critical Orion Pdp Co., Ltd
Publication of WO2010038979A2 publication Critical patent/WO2010038979A2/en
Publication of WO2010038979A3 publication Critical patent/WO2010038979A3/en

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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
    • G09G3/28—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 luminous gas-discharge panels, e.g. plasma panels
    • G09G3/288—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 luminous gas-discharge panels, e.g. plasma panels using AC panels
    • G09G3/296—Driving circuits for producing the waveforms applied to the driving electrodes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/28—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 luminous gas-discharge panels, e.g. plasma panels
    • G09G3/288—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 luminous gas-discharge panels, e.g. plasma panels using AC panels
    • G09G3/291—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 luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes
    • G09G3/292—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 luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes for reset discharge, priming discharge or erase discharge occurring in a phase other than addressing
    • G09G3/2927—Details of initialising
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/06—Details of flat display driving waveforms
    • G09G2310/066—Waveforms comprising a gently increasing or decreasing portion, e.g. ramp
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/08—Details of timing specific for flat panels, other than clock recovery
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/04—Display protection

Definitions

  • This disclosure relates to a method for driving an AC type plasma display panel, and more particularly, to a method for driving an AC type plasma display panel capable of preventing a driving circuit from being damaged and improving the reliability of an operation of the driving circuit at initial power on time of an AC type plasma display panel.
  • an AC type plasma display panel is a display element which exhibits luminance by generating a gas discharge inside cells.
  • the AC type plasma display panel is classified into an AC type and a DC type in accordance with a discharge type.
  • an AC three-electrode surface discharge plasma display panel having three electrodes is widely used.
  • the general AC three-electrode surface discharge plasma display panel controls luminance by inducing a reliable discharge of a cell in accordance with a voltage applied from the outside of the cell.
  • an address display separation (ADS) driving type with ramp-reset is used.
  • ADS driving type in order to realize one image, one frame is divided into plural subfields having different number of sustain pulses, and each of the subfields is divided into three periods, that is, a reset period, an address period, and a sustain period.
  • the reset period is a period during which a uniform wall charge suitable for discharge conditions of all cells of the plasma display panel with respect to an external application voltage is adjusted to be maintained in order to induce a stable address discharge in the address period.
  • the address period is a period during which a cell to be discharged or not to be discharged in the sustain period is divided in such a manner that all cells are subjected to an address discharge by sequentially applying a scan pulse to numerous scan electrodes and applying a data voltage Vd to the address electrode. At this time, the wall charge of the cell to be discharged changes greatly, and hence a condition is satisfied in which the sustain discharge is maintained in the sustain period.
  • the sustain period is a period during which the sustain discharge of the cell selected as the cell to be discharged in the address period is continued by alternately applying the high sustain voltage Vsus to the scan electrode and the sustain electrode.
  • Fig. 1 is a block diagram schematically showing a driving circuit unit of an AC type plasma display panel according to a prior art.
  • a driving circuit unit 10 includes a scan electrode driving circuit 11, a sustain electrode driving circuit 13, an address electrode driving circuit 15, a logic control circuit 17, and a power supply circuit 19.
  • the driving circuit unit 10 applies a driving waveform for a stable operation of an AC type plasma display panel (not shown) to a scan electrode, a sustain electrode, and an address electrode. Since the driving circuit unit 10uses a ramp waveform in which a voltage changes in time as shown in Fig. 2 as a driving waveform applied to the scan electrode in a reset period for allowing a discharge condition of the cell to be uniform, it is possible to ensure a wider margin.
  • a circuit related to the sustain electrode driving circuit 13 and a circuit for creating a ramp-up portion of the ramp waveform shown in Fig. 2 are configured as shown in Fig. 3.
  • the operation of the ramp-up portion of the circuit shown in Fig. 3 will be briefly described.
  • a first switch SW1 (ERH) and a third switch SW3 (SUSH) are sequentially turned on so as to increase an output waveform of the scan electrode up to a sustain voltage Vsus.
  • a first capacitor C1 is always maintained in a state where the first capacitor C1 is charged as much as a ramp voltage Vramp with respect to the voltage at the point A.
  • the voltage at the point B is equal to a voltage Vsus + Vramp obtained by adding the sustain voltage Vsus to the ramp voltage Vramp.
  • a fifth switch SW5 is turned off and a seventh switch SW7 (RAMP-UP) is turned on
  • the added voltage Vsus + Vramp is applied to the panel, and hence the ramp-up waveform shown in Fig. 2 is output.
  • the sustain voltage Vsus may be directly applied as the ramp voltage Vramp, or a voltage not less than the sustain voltage Vsus may be applied by using another power supply circuit.
  • a method for driving an AC type plasma display panel by using the driving circuit unit 10 with such a configuration will be described with reference to Fig. 4.
  • the power supply circuit 19 turns on a voltage of 5 V at a first time point T1
  • the power supply circuit 19 turns on the sustain voltage Vsus as a driving voltage at a second time point T2.
  • the logic control circuit 17 outputs control signals for controlling an operation of turning on/off the switches.
  • the first capacitor C1 is always charged to the ramp voltage Vramp with respect to the point A. Since a fourth switch SW4 is turned on by operating the control signal at an initial charging time point, the point A is in a ground (GND) state. Accordingly, when the operation is performed in accordance with the sequence shown in Fig. 4, the ramp voltage Vramp may be completely applied to the point B since the sustain voltage Vsus is already turned on and maintained for a predetermined period of time before the fourth switch SW4 is turned on. In this state, when the fourth switch SW4 is turned on in accordance with the operation of the control signals for controlling the switches shown in Fig.
  • the ramp voltage Vramp is charged to the first capacitor C1, and a current flows along a path depicted by the arrow, that is, a path to the ground GND through the point B, the first capacitor C1, the point A, and the fourth switch SW4.
  • the ramp voltage Vramp is equal to the sustain voltage or higher than the sustain voltage
  • the first capacitor C1 is instantly charged upon charging the first capacitor C1. Accordingly, the charging current of the first capacitor C1 is very large. The large charging current may increase the possibility of damaging the elements located in the path, and may deteriorate the safety and the reliability of the operation of the driving circuit.
  • a power supply sequence of the power supply circuit 19 shown in Fig. 1 and a control signal output sequence of the logic control circuit 17 shown in Fig. 1, that is, a so-called on sequence has to be very importantly controlled.
  • this disclosure is directed to providing a method for driving an AC type plasma display panel capable of preventing a driving circuit from being damaged by improving an on sequence at initial power on time of the plasma display panel.
  • the disclosure is also directed to providing a method for driving an AC type plasma display panel capable of improving the reliability of an operation of a driving circuit by improving an on sequence at initial power on time of plasma display panel.
  • a method for driving an AC type plasma display panel having three-electrode structure wherein the AC type plasma display panel including: a scan electrode and a sustain electrode configured to apply scan pulse, and sustain pulse; and an address electrode configured to apply a data pulse
  • the method for driving the AC type plasma display panel including: allowing a power supply circuit to turn on a voltage of 5 V to be input to a logic control circuit at initial power on time of the plasma display panel; allowing the logic control circuit to turn on a control signal C YSUSL for controlling a ground switching element of a scan electrode driving circuit when the voltage of 5 V is turned on; allowing the power supply circuit to turn on a sustain voltage Vsus when the control signal C YSUSL is turned on; and allowing the logic control circuit to turn on a control signal C YSUSL for controlling the scan electrode driving circuit, the sustain electrode driving circuit, and the address electrode driving circuit when the sustain voltage Vsus is turned on.
  • the control signal C YSUSL may be turned on just after a time point when the voltage of 5 V is turned on.
  • the control signal C YSUSL may be turned on just after a time point when the voltage of 5 V is turned on and before a time point when the sustain voltage Vsus is turned on.
  • the control signal C YSUSL may be maintained in a power on state after a time point when the sustain voltage Vsus is turned on.
  • the control signal C YSUSL may be maintained in a power on state until a time point when the logic control circuit turns on the control signals for controlling the scan electrode driving circuit, the sustain electrode driving circuit, and the address electrode driving circuit.
  • a control signal C YSUSL for turning on a ground switching element of a scan electrode driving circuit is turned on just after a time point when a power supply circuit turns on a voltage of 5 V and before a time point when the power supply circuit turns on a sustain voltage Vsus.
  • Fig. 1 is a block diagram schematically showing a driving circuit unit of an AC type plasma display panel according to a prior art
  • Fig. 2 is a waveform diagram showing a general ramp waveform applied to the driving circuit unit shown in Fig. 1;
  • Fig. 3 is a circuit diagram showing a sustain circuit and a circuit for creating a ramp-up portion applied to the driving circuit unit shown in Fig. 1;
  • Fig. 4 is a timing diagram showing an operation sequence upon initially turning on the AC type plasma display panel according to a prior art
  • Fig. 5 is a block diagram schematically showing the driving circuit unit applied to a method for driving the AC type plasma display panel according to an embodiment of present disclosure
  • Fig. 6 is a timing diagram showing an operation sequence at the initial power on time of the plasma display panel applied to the method for driving the AC type plasma display panel according to the embodiment of present disclosure
  • Fig. 7 is a timing diagram showing an operation sequence at the initial power on time of the plasma display panel applied to the method for driving the AC type plasma display panel according to another embodiment of present disclosure.
  • Fig. 8 is a diagram showing an example in which a sustain voltage Vsus rises with a gentle slope.
  • Fig. 5 is a block diagram schematically showing a driving circuit unit applied to a method for driving an AC type plasma display panel according to an embodiment of present disclosure.
  • a driving circuit unit 20 for driving an AC type plasma display panel includes a scan electrode driving circuit 11, a sustain electrode driving circuit 13, an address electrode driving circuit 15, a logic control circuit 27, and a power supply circuit 19.
  • the logic control circuit 27 includes a control portion for a ground switching element 271.
  • the scan electrode driving circuit 11 is a driving circuit which is in charge of driving a scan electrode and includes a plurality of switching elements (not shown).
  • the sustain electrode driving circuit 13 is a driving circuit which is in charge of driving a sustain electrode and includes a plurality of switching elements (not shown).
  • the address electrode driving circuit 15 transmits power, a control signal, and an image data to a data integrated circuit (IC) (not shown) which is electrically connected to an address electrode by means of, for example, a tape carrier package (TCP) or a chip on film (COF).
  • the logic control circuit 27 supplies a control signal to each of the scan electrode driving circuit 11, the sustain electrode driving circuit 13, and the address electrode driving circuit 15 so as to create a driving waveform, and processes an image data.
  • the power supply circuit 19 supplies a power for logic and switching, e.g. 5 V or15 V, and a driving voltage such as a sustain voltage Vsus and a data voltage Vdata so as to operate the logic control circuit 27 and each of the driving circuits 11, 13, and 15.
  • a power for logic and switching e.g. 5 V or15 V
  • a driving voltage such as a sustain voltage Vsus and a data voltage Vdata so as to operate the logic control circuit 27 and each of the driving circuits 11, 13, and 15.
  • the control portion for a ground switching element 271 solves the known problem which may be caused at the initial power on time point of the AC type plasma display panel by controlling the ground switching element SUSL (SW4) (see Fig. 3) of the scan electrode driving circuit 11.
  • the control portion for a ground switching element 271 may be configured as software of the logic control circuit 27 instead of a separate hardware.
  • the basic operation of the driving circuit unit 20 with such a configuration is the same as that of the known driving circuit unit 10 except for the control operation of the control portion for a ground switching element 271. Therefore, for the convenience of the description, the detailed description thereof will be omitted in order to avoid the repetitive description.
  • control portion for a ground switching element 271 for solving the known problem will be described in detail on the basis of the operation sequence at the initial power on time point of the AC type plasma display panel shown in Fig. 6.
  • the power supply circuit 19 turns on a voltage of 5 V at the first time point T11, and the voltage of 5 V turned on as described above is input to the logic control circuit 27.
  • the control portion for a ground switching element 271 inside the logic control circuit 27 recognizes that the voltage of 5 V is input to the logic control circuit 27, the control portion for a ground switching element 271 outputs a control signal C YSUSL for turning on a ground switching element SUSL (SW4) shown in Fig. 3 to the scan electrode driving circuit 11.
  • the output of the control signal C YSUSL is sustained from the second time point T12 just after the voltage of 5 V is turned on until the fourth time point T14, which is the operation time point of the control signals.
  • the control signal C YSUSL may be output in the state where the voltage of 5 V is unstable.
  • the output of the control signal C YSUSL may start at the new second time point T22 after a predetermined period of time is elapsed from the first time point T11 when the voltage of 5 V is turned on. That is, the output may start at the time point when the voltage of 5 V becomes stable.
  • the new second time point T22 is a time point before the third time point T13 when the sustain voltage Vsus is turned on.
  • the sustain voltage Vsus which is turned on is input to the scan electrode driving circuit 11 and the sustain electrode driving circuit 13.
  • the sustain voltage Vsus does not abruptly rise to the value of sustain voltage Vsus as shown in Fig. 6 or 7 when being turned on by the power supply circuit 19, but rises with a gentle slope as shown in Fig. 8 with a time duration of about 0.5 s or more.
  • a ramp voltage Vramp which is input to the point B shown in Fig. 3 has a gentle ascending slope as shown in Fig. 8. This is a natural result in the case where the ramp voltage Vramp is equal to the sustain voltage Vsus.
  • the ramp voltage Vramp has a gentle ascending slope similar to the slope shown in Fig. 8.
  • the initial charging operation of a first capacitor C1 shown in Fig. 3 using the ramp voltage Vramp is limited to a time point when the ground switching element SW4 is turned on.
  • the ground switching element SW4 since the ground switching element SW4 is turned on at a time point before the sustain voltage Vsus is turned on regardless of whether the output time point of the control signal C YSUSL is the second time point T12 or the new second time point T22, the point A is maintained in a ground state.
  • the sustain voltage Vsus is turned on with a gentle slope as shown in Fig. 8 and is input to the point B shown in Fig. 3. Then, the first capacitor C1 is not instantly charged, but is charged with a gentle slope.
  • current flows along a path depicted by the arrow shown in Fig. 3, that is, a path to the ground GND through the point B, the first capacitor C1, the point A, and the fourth switch SW4. Since the first capacitor C1 is not instantly charged upon charging the first capacitor C1, the charging current of the first capacitor C1 becomes small. Accordingly, it is possible to decrease the possibility of damaging the elements located in the path, and thus to improve the safety of the driving circuit. As a result, it is possible to improve the reliability of the operation of the AC type plasma display panel.
  • the logic control circuit 27 outputs all control signals including the control signal C YSUSL to each of the scan electrode driving circuit 11, the sustain electrode driving circuit 13, and the address electrode driving circuit 15.
  • each of the control signals has a setting value for applying an appropriate waveform to a panel (not shown). Since the detailed description related to the setting value will be easily understood by the person having general knowledge in the art and is less related to the spirit of this disclosure, the detailed description will be omitted for the convenience of the description.
  • the control signal C YSUSL operated by the control portion for a ground switching element 271 ends before the fourth time point T14 when all the control signals are output. Accordingly, after the fourth time point T14, the setting value of the logic control circuit 27 for the waveform output is set as shown in Fig. 6.
  • the driving circuit of the AC type plasma display panel it is possible to prevent the driving circuit of the AC type plasma display panel from being damaged and to improve the safety thereof in such a manner that the control signal C YSUSL for turning on the ground switching element of the scan electrode driving circuit is turned on just after the time point when the power supply circuit turns on a voltage of 5 V or before the time point when the power supply circuit turns on the sustain voltage Vsus. As a result, it is possible to improve the reliability of the operation of the AC type plasma display panel.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Power Engineering (AREA)
  • Plasma & Fusion (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Control Of Gas Discharge Display Tubes (AREA)
PCT/KR2009/005595 2008-10-01 2009-09-30 Method for driving an ac type plasma display panel WO2010038979A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2008-0096450 2008-10-01
KR1020080096450A KR101219478B1 (ko) 2008-10-01 2008-10-01 플라즈마 디스플레이 패널의 구동방법

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WO2010038979A2 true WO2010038979A2 (en) 2010-04-08
WO2010038979A3 WO2010038979A3 (en) 2013-02-28

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1530192A2 (en) * 2003-11-04 2005-05-11 Lg Electronics Inc. Apparatus and method for driving a plasma display panel
EP1659561A2 (en) * 2004-11-19 2006-05-24 LG Electronics, Inc. Plasma display apparatus and driving method thereof
US20060109211A1 (en) * 2004-11-19 2006-05-25 Lg Electronics Inc. Plasma display apparatus and driving method of the same

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3611377B2 (ja) * 1995-09-01 2005-01-19 富士通株式会社 画像表示装置
KR100589410B1 (ko) * 2003-11-19 2006-06-14 삼성에스디아이 주식회사 플라즈마 디스플레이 패널 및 그 구동 방법
KR100839370B1 (ko) * 2006-11-07 2008-06-20 삼성에스디아이 주식회사 플라즈마 표시 장치 및 그 구동 방법
KR100831015B1 (ko) 2007-03-28 2008-05-20 삼성에스디아이 주식회사 플라즈마 표시 장치 및 그 구동 방법

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1530192A2 (en) * 2003-11-04 2005-05-11 Lg Electronics Inc. Apparatus and method for driving a plasma display panel
EP1659561A2 (en) * 2004-11-19 2006-05-24 LG Electronics, Inc. Plasma display apparatus and driving method thereof
US20060109211A1 (en) * 2004-11-19 2006-05-25 Lg Electronics Inc. Plasma display apparatus and driving method of the same

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WO2010038979A3 (en) 2013-02-28
KR101219478B1 (ko) 2013-01-11
KR20100037233A (ko) 2010-04-09

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