DE3850630D1 - Graustufen-Anzeige. - Google Patents
Graustufen-Anzeige.Info
- Publication number
- DE3850630D1 DE3850630D1 DE3850630T DE3850630T DE3850630D1 DE 3850630 D1 DE3850630 D1 DE 3850630D1 DE 3850630 T DE3850630 T DE 3850630T DE 3850630 T DE3850630 T DE 3850630T DE 3850630 D1 DE3850630 D1 DE 3850630D1
- Authority
- DE
- Germany
- Prior art keywords
- grayscale display
- grayscale
- display
- 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.)
- Expired - Lifetime
Links
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
- G09G3/34—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 by control of light from an independent source
- G09G3/36—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 by control of light from an independent source using liquid crystals
-
- 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
- G09G3/2007—Display of intermediate tones
- G09G3/2011—Display of intermediate tones by amplitude modulation
-
- 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
- G09G3/34—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 by control of light from an independent source
- G09G3/36—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 by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3685—Details of drivers for data electrodes
- G09G3/3688—Details of drivers for data electrodes suitable for active matrices only
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
- H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
- H04N3/12—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical by switched stationary formation of lamps, photocells or light relays
- H04N3/127—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical by switched stationary formation of lamps, photocells or light relays using liquid crystals
-
- 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
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0243—Details of the generation of driving signals
- G09G2310/0259—Details of the generation of driving signals with use of an analog or digital ramp generator in the column driver or in the pixel circuit
-
- 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
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0264—Details of driving circuits
- G09G2310/027—Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters
-
- 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
-
- 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
- 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
- G09G3/34—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 by control of light from an independent source
- G09G3/36—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 by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3614—Control of polarity reversal in general
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Liquid Crystal Display Device Control (AREA)
- Liquid Crystal (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62249832A JP2852042B2 (ja) | 1987-10-05 | 1987-10-05 | 表示装置 |
Publications (2)
Publication Number | Publication Date |
---|---|
DE3850630D1 true DE3850630D1 (de) | 1994-08-18 |
DE3850630T2 DE3850630T2 (de) | 1994-11-03 |
Family
ID=17198850
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE3850630T Expired - Lifetime DE3850630T2 (de) | 1987-10-05 | 1988-09-29 | Graustufen-Anzeige. |
Country Status (5)
Country | Link |
---|---|
US (1) | US5091722A (de) |
EP (1) | EP0310941B1 (de) |
JP (1) | JP2852042B2 (de) |
KR (1) | KR960004648B1 (de) |
DE (1) | DE3850630T2 (de) |
Families Citing this family (71)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02132490A (ja) * | 1988-11-14 | 1990-05-21 | Toshiba Corp | 液晶ディスプレイ駆動装置 |
US5287095A (en) * | 1988-12-09 | 1994-02-15 | Hitachi, Ltd. | Display device and its displaying method |
JPH02216190A (ja) * | 1989-02-17 | 1990-08-29 | Toshiba Corp | アクテイブマトリクス型表示装置 |
EP0478386B1 (de) * | 1990-09-28 | 1995-12-13 | Sharp Kabushiki Kaisha | Steuerschaltung für ein Anzeigegerät |
JP2761128B2 (ja) * | 1990-10-31 | 1998-06-04 | 富士通株式会社 | 液晶表示装置 |
EP0499979A3 (en) * | 1991-02-16 | 1993-06-09 | Semiconductor Energy Laboratory Co., Ltd. | Electro-optical device |
JP2794499B2 (ja) | 1991-03-26 | 1998-09-03 | 株式会社半導体エネルギー研究所 | 半導体装置の作製方法 |
US5459495A (en) * | 1992-05-14 | 1995-10-17 | In Focus Systems, Inc. | Gray level addressing for LCDs |
US5280280A (en) * | 1991-05-24 | 1994-01-18 | Robert Hotto | DC integrating display driver employing pixel status memories |
JPH0535200A (ja) * | 1991-07-31 | 1993-02-12 | Hitachi Ltd | 表示装置とその駆動方法 |
JP2845303B2 (ja) | 1991-08-23 | 1999-01-13 | 株式会社 半導体エネルギー研究所 | 半導体装置とその作製方法 |
JP2639763B2 (ja) * | 1991-10-08 | 1997-08-13 | 株式会社半導体エネルギー研究所 | 電気光学装置およびその表示方法 |
US6778159B1 (en) * | 1991-10-08 | 2004-08-17 | Semiconductor Energy Laboratory Co., Ltd. | Active matrix display and a method of driving the same |
JP2651972B2 (ja) * | 1992-03-04 | 1997-09-10 | 株式会社半導体エネルギー研究所 | 液晶電気光学装置 |
EP0648403A1 (de) * | 1992-06-30 | 1995-04-19 | Westinghouse Electric Corporation | Graustufengenerator mit individueller stufenkorrektur |
JP2848139B2 (ja) * | 1992-07-16 | 1999-01-20 | 日本電気株式会社 | アクティブマトリクス型液晶表示装置とその駆動方法 |
KR100288037B1 (ko) * | 1992-09-14 | 2001-05-02 | 가나이 쓰도무 | 표시장치의 구동방법 |
US5532712A (en) * | 1993-04-13 | 1996-07-02 | Kabushiki Kaisha Komatsu Seisakusho | Drive circuit for use with transmissive scattered liquid crystal display device |
JPH07121141A (ja) * | 1993-10-25 | 1995-05-12 | Nec Corp | 液晶表示装置 |
US6362835B1 (en) * | 1993-11-23 | 2002-03-26 | Texas Instruments Incorporated | Brightness and contrast control for a digital pulse-width modulated display system |
US5798746A (en) * | 1993-12-27 | 1998-08-25 | Semiconductor Energy Laboratory Co., Ltd. | Liquid crystal display device |
JP3482683B2 (ja) * | 1994-04-22 | 2003-12-22 | ソニー株式会社 | アクティブマトリクス表示装置及びその駆動方法 |
US5717418A (en) * | 1994-08-30 | 1998-02-10 | Proxima Corporation | Ferroelectric liquid crystal display apparatus and method of making it |
US5748164A (en) | 1994-12-22 | 1998-05-05 | Displaytech, Inc. | Active matrix liquid crystal image generator |
US5808800A (en) | 1994-12-22 | 1998-09-15 | Displaytech, Inc. | Optics arrangements including light source arrangements for an active matrix liquid crystal image generator |
JPH0981074A (ja) * | 1995-09-19 | 1997-03-28 | Fujitsu Ltd | ディスプレイ装置及びディスプレイユニット及びディスプレイ信号生成装置 |
JP3597287B2 (ja) * | 1995-11-29 | 2004-12-02 | 株式会社半導体エネルギー研究所 | 表示装置及びその駆動方法 |
JP3305946B2 (ja) * | 1996-03-07 | 2002-07-24 | 株式会社東芝 | 液晶表示装置 |
WO1997035295A2 (en) * | 1996-03-18 | 1997-09-25 | Philips Electronics N.V. | Plasma-addressed colour display |
EP0797182A1 (de) * | 1996-03-19 | 1997-09-24 | Hitachi, Ltd. | Flüssigkristallanzeige mit aktiver Matrix und mit Datenhalteschaltung in jedem Pixel |
GB9704149D0 (en) * | 1996-08-16 | 1997-04-16 | Philips Electronics Nv | Active matrix display devices and methods of driving such |
US6057809A (en) * | 1996-08-21 | 2000-05-02 | Neomagic Corp. | Modulation of line-select times of individual rows of a flat-panel display for gray-scaling |
JP3403027B2 (ja) * | 1996-10-18 | 2003-05-06 | キヤノン株式会社 | 映像水平回路 |
KR100280717B1 (ko) * | 1998-09-25 | 2001-02-01 | 김순택 | 디지털 아나로그 변환기 |
JP2000163014A (ja) * | 1998-11-27 | 2000-06-16 | Sanyo Electric Co Ltd | エレクトロルミネッセンス表示装置 |
TW484117B (en) | 1999-11-08 | 2002-04-21 | Semiconductor Energy Lab | Electronic device |
JP2001306039A (ja) * | 2000-04-26 | 2001-11-02 | Mitsubishi Electric Corp | 液晶表示駆動装置及びそれを備えた携帯電話機 |
TW501086B (en) * | 2000-07-15 | 2002-09-01 | Mosel Vitelic Inc | Liquid crystal display panel signal processor |
TW522374B (en) * | 2000-08-08 | 2003-03-01 | Semiconductor Energy Lab | Electro-optical device and driving method of the same |
US6992652B2 (en) * | 2000-08-08 | 2006-01-31 | Semiconductor Energy Laboratory Co., Ltd. | Liquid crystal display device and driving method thereof |
US6987496B2 (en) * | 2000-08-18 | 2006-01-17 | Semiconductor Energy Laboratory Co., Ltd. | Electronic device and method of driving the same |
US7180496B2 (en) * | 2000-08-18 | 2007-02-20 | Semiconductor Energy Laboratory Co., Ltd. | Liquid crystal display device and method of driving the same |
TW518552B (en) * | 2000-08-18 | 2003-01-21 | Semiconductor Energy Lab | Liquid crystal display device, method of driving the same, and method of driving a portable information device having the liquid crystal display device |
TW514854B (en) * | 2000-08-23 | 2002-12-21 | Semiconductor Energy Lab | Portable information apparatus and method of driving the same |
JP4014831B2 (ja) * | 2000-09-04 | 2007-11-28 | 株式会社半導体エネルギー研究所 | El表示装置及びその駆動方法 |
US6774876B2 (en) | 2000-10-02 | 2004-08-10 | Semiconductor Energy Laboratory Co., Ltd. | Self light emitting device and driving method thereof |
US7184014B2 (en) * | 2000-10-05 | 2007-02-27 | Semiconductor Energy Laboratory Co., Ltd. | Liquid crystal display device |
US6747623B2 (en) * | 2001-02-09 | 2004-06-08 | Semiconductor Energy Laboratory Co., Ltd. | Liquid crystal display device and method of driving the same |
JPWO2002077958A1 (ja) * | 2001-03-22 | 2004-07-15 | キヤノン株式会社 | アクティブマトリクス型発光素子の駆動回路 |
JP2002358056A (ja) * | 2001-03-28 | 2002-12-13 | Seiko Epson Corp | 画像表示装置および共通信号供給方法 |
JP2003114646A (ja) * | 2001-08-03 | 2003-04-18 | Semiconductor Energy Lab Co Ltd | 表示装置及びその駆動方法。 |
TWI273539B (en) * | 2001-11-29 | 2007-02-11 | Semiconductor Energy Lab | Display device and display system using the same |
JP3913534B2 (ja) * | 2001-11-30 | 2007-05-09 | 株式会社半導体エネルギー研究所 | 表示装置及びこれを用いた表示システム |
JP4067878B2 (ja) * | 2002-06-06 | 2008-03-26 | 株式会社半導体エネルギー研究所 | 発光装置及びそれを用いた電気器具 |
JP3758039B2 (ja) | 2002-06-10 | 2006-03-22 | セイコーエプソン株式会社 | 駆動回路及び電気光学装置 |
US6982727B2 (en) * | 2002-07-23 | 2006-01-03 | Broadcom Corporation | System and method for providing graphics using graphical engine |
KR100920341B1 (ko) * | 2003-02-06 | 2009-10-07 | 삼성전자주식회사 | 액정 표시 장치 |
KR100529076B1 (ko) * | 2003-11-10 | 2005-11-15 | 삼성에스디아이 주식회사 | 역다중화 장치 및 이를 이용한 디스플레이 장치 |
JP2005157013A (ja) * | 2003-11-27 | 2005-06-16 | Hitachi Displays Ltd | 表示装置 |
JP2005275315A (ja) * | 2004-03-26 | 2005-10-06 | Semiconductor Energy Lab Co Ltd | 表示装置、その駆動方法及びそれを用いた電子機器 |
US7502040B2 (en) * | 2004-12-06 | 2009-03-10 | Semiconductor Energy Laboratory Co., Ltd. | Display device, driving method thereof and electronic appliance |
US20060139265A1 (en) * | 2004-12-28 | 2006-06-29 | Semiconductor Energy Laboratory Co., Ltd. | Driving method of display device |
US20060158399A1 (en) | 2005-01-14 | 2006-07-20 | Semiconductor Energy Laboratory Co., Ltd. | Driving method of display device |
KR100611508B1 (ko) * | 2005-01-31 | 2006-08-11 | 삼성전자주식회사 | 채널을 분리하여 출력하는 디스플레이 구동 회로,디스플레이 구동 방법 및 전류 샘플/홀드 회로 |
US7719526B2 (en) | 2005-04-14 | 2010-05-18 | Semiconductor Energy Laboratory Co., Ltd. | Display device, and driving method and electronic apparatus of the display device |
US8633919B2 (en) * | 2005-04-14 | 2014-01-21 | Semiconductor Energy Laboratory Co., Ltd. | Display device, driving method of the display device, and electronic device |
EP1720148A3 (de) * | 2005-05-02 | 2007-09-05 | Semiconductor Energy Laboratory Co., Ltd. | Anzeigevorrichtung und Verfahren mit Unterrahmen zur Ansteuerung von Graustufen |
KR101404582B1 (ko) * | 2006-01-20 | 2014-06-09 | 가부시키가이샤 한도오따이 에네루기 켄큐쇼 | 표시장치의 구동방법 |
KR20100018322A (ko) * | 2008-08-06 | 2010-02-17 | 삼성전자주식회사 | 액정 표시 장치 및 그것의 제어 방법 |
WO2013172220A1 (en) | 2012-05-18 | 2013-11-21 | Semiconductor Energy Laboratory Co., Ltd. | Pixel circuit, display device, and electronic device |
JP2020154230A (ja) * | 2019-03-22 | 2020-09-24 | 株式会社Jvcケンウッド | 液晶表示装置及びその製造方法 |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL7903515A (nl) * | 1979-05-04 | 1980-11-06 | Philips Nv | Modulatorschakeling voor een matrixweergeefinrichting. |
DE3026392C2 (de) * | 1980-02-26 | 1985-08-22 | Sharp K.K., Osaka | Anzeigevorrichtung mit einem elektrolumineszenten Dünnschichtelement zur Bilddarstellung |
JPS5772487U (de) * | 1980-10-20 | 1982-05-04 | ||
JPS5927687A (ja) * | 1982-08-04 | 1984-02-14 | Casio Comput Co Ltd | ポケツタブルテレビジヨン受像機 |
US4554539A (en) * | 1982-11-08 | 1985-11-19 | Rockwell International Corporation | Driver circuit for an electroluminescent matrix-addressed display |
JPS59138184A (ja) * | 1983-01-28 | 1984-08-08 | Citizen Watch Co Ltd | マトリクスカラ−テレビパネル駆動回路 |
JPS60162293A (ja) * | 1984-02-02 | 1985-08-24 | ソニー株式会社 | 表示装置 |
JPS60142537U (ja) * | 1984-02-28 | 1985-09-20 | 日本電気株式会社 | 非直線デイジタル−アナログ変換器 |
JP2646523B2 (ja) * | 1984-10-26 | 1997-08-27 | 旭硝子株式会社 | 画像表示装置 |
JPS61116334A (ja) * | 1984-11-09 | 1986-06-03 | Seiko Epson Corp | アクテイブマトリクスパネル |
US4745485A (en) * | 1985-01-28 | 1988-05-17 | Sanyo Electric Co., Ltd | Picture display device |
JPS6273294A (ja) * | 1985-09-27 | 1987-04-03 | カシオ計算機株式会社 | 画像表示装置 |
JPS62143524A (ja) * | 1985-12-18 | 1987-06-26 | Fuji Electric Co Ltd | デジタル/アナログ変換装置 |
KR910001848B1 (ko) * | 1986-02-06 | 1991-03-28 | 세이꼬 엡슨 가부시끼가이샤 | 화상 표시 장치 |
FR2594579B1 (fr) * | 1986-02-17 | 1988-04-15 | Commissariat Energie Atomique | Ecran d'affichage a matrice active permettant l'affichage de niveaux de gris |
-
1987
- 1987-10-05 JP JP62249832A patent/JP2852042B2/ja not_active Expired - Lifetime
-
1988
- 1988-09-29 DE DE3850630T patent/DE3850630T2/de not_active Expired - Lifetime
- 1988-09-29 EP EP88116066A patent/EP0310941B1/de not_active Expired - Lifetime
- 1988-10-03 US US07/252,605 patent/US5091722A/en not_active Expired - Lifetime
- 1988-10-05 KR KR1019880012998A patent/KR960004648B1/ko not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
JPH0192797A (ja) | 1989-04-12 |
US5091722A (en) | 1992-02-25 |
KR960004648B1 (ko) | 1996-04-11 |
JP2852042B2 (ja) | 1999-01-27 |
DE3850630T2 (de) | 1994-11-03 |
EP0310941A2 (de) | 1989-04-12 |
EP0310941A3 (en) | 1990-10-17 |
KR890007112A (ko) | 1989-06-19 |
EP0310941B1 (de) | 1994-07-13 |
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