FR2592227A1 - Dispositif photoemissif a semi-conducteur de type directionnel - Google Patents
Dispositif photoemissif a semi-conducteur de type directionnelInfo
- Publication number
- FR2592227A1 FR2592227A1 FR8618156A FR8618156A FR2592227A1 FR 2592227 A1 FR2592227 A1 FR 2592227A1 FR 8618156 A FR8618156 A FR 8618156A FR 8618156 A FR8618156 A FR 8618156A FR 2592227 A1 FR2592227 A1 FR 2592227A1
- Authority
- FR
- France
- Prior art keywords
- photoemissitive
- type semiconductor
- active region
- directional type
- substrate
- 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
- 239000004065 semiconductor Substances 0.000 title abstract 3
- 239000000758 substrate Substances 0.000 abstract 3
- 238000009792 diffusion process Methods 0.000 abstract 1
- 239000012535 impurity Substances 0.000 abstract 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/02—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor bodies
- H01L33/20—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor bodies with a particular shape, e.g. curved or truncated substrate
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/15—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components having potential barriers, specially adapted for light emission
- H01L27/153—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components having potential barriers, specially adapted for light emission in a repetitive configuration, e.g. LED bars
- H01L27/156—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components having potential barriers, specially adapted for light emission in a repetitive configuration, e.g. LED bars two-dimensional arrays
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/0004—Devices characterised by their operation
- H01L33/0008—Devices characterised by their operation having p-n or hi-lo junctions
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/005—Processes
- H01L33/0093—Wafer bonding; Removal of the growth substrate
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/10—Construction or shape of the optical resonator, e.g. extended or external cavity, coupled cavities, bent-guide, varying width, thickness or composition of the active region
- H01S5/18—Surface-emitting [SE] lasers, e.g. having both horizontal and vertical cavities
- H01S5/185—Surface-emitting [SE] lasers, e.g. having both horizontal and vertical cavities having only horizontal cavities, e.g. horizontal cavity surface-emitting lasers [HCSEL]
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/40—Arrangement of two or more semiconductor lasers, not provided for in groups H01S5/02 - H01S5/30
- H01S5/42—Arrays of surface emitting lasers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/0001—Technical content checked by a classifier
- H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/0004—Devices characterised by their operation
- H01L33/0008—Devices characterised by their operation having p-n or hi-lo junctions
- H01L33/0016—Devices characterised by their operation having p-n or hi-lo junctions having at least two p-n junctions
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/02—Structural details or components not essential to laser action
- H01S5/0206—Substrates, e.g. growth, shape, material, removal or bonding
- H01S5/0207—Substrates having a special shape
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/02—Structural details or components not essential to laser action
- H01S5/022—Mountings; Housings
- H01S5/0225—Out-coupling of light
- H01S5/02251—Out-coupling of light using optical fibres
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/10—Construction or shape of the optical resonator, e.g. extended or external cavity, coupled cavities, bent-guide, varying width, thickness or composition of the active region
- H01S5/12—Construction or shape of the optical resonator, e.g. extended or external cavity, coupled cavities, bent-guide, varying width, thickness or composition of the active region the resonator having a periodic structure, e.g. in distributed feedback [DFB] lasers
- H01S5/1237—Lateral grating, i.e. grating only adjacent ridge or mesa
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/20—Structure or shape of the semiconductor body to guide the optical wave ; Confining structures perpendicular to the optical axis, e.g. index or gain guiding, stripe geometry, broad area lasers, gain tailoring, transverse or lateral reflectors, special cladding structures, MQW barrier reflection layers
- H01S5/2054—Methods of obtaining the confinement
- H01S5/2059—Methods of obtaining the confinement by means of particular conductivity zones, e.g. obtained by particle bombardment or diffusion
- H01S5/2072—Methods of obtaining the confinement by means of particular conductivity zones, e.g. obtained by particle bombardment or diffusion obtained by vacancy induced diffusion
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/20—Structure or shape of the semiconductor body to guide the optical wave ; Confining structures perpendicular to the optical axis, e.g. index or gain guiding, stripe geometry, broad area lasers, gain tailoring, transverse or lateral reflectors, special cladding structures, MQW barrier reflection layers
- H01S5/22—Structure or shape of the semiconductor body to guide the optical wave ; Confining structures perpendicular to the optical axis, e.g. index or gain guiding, stripe geometry, broad area lasers, gain tailoring, transverse or lateral reflectors, special cladding structures, MQW barrier reflection layers having a ridge or stripe structure
- H01S5/2205—Structure or shape of the semiconductor body to guide the optical wave ; Confining structures perpendicular to the optical axis, e.g. index or gain guiding, stripe geometry, broad area lasers, gain tailoring, transverse or lateral reflectors, special cladding structures, MQW barrier reflection layers having a ridge or stripe structure comprising special burying or current confinement layers
- H01S5/2222—Structure or shape of the semiconductor body to guide the optical wave ; Confining structures perpendicular to the optical axis, e.g. index or gain guiding, stripe geometry, broad area lasers, gain tailoring, transverse or lateral reflectors, special cladding structures, MQW barrier reflection layers having a ridge or stripe structure comprising special burying or current confinement layers having special electric properties
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/20—Structure or shape of the semiconductor body to guide the optical wave ; Confining structures perpendicular to the optical axis, e.g. index or gain guiding, stripe geometry, broad area lasers, gain tailoring, transverse or lateral reflectors, special cladding structures, MQW barrier reflection layers
- H01S5/22—Structure or shape of the semiconductor body to guide the optical wave ; Confining structures perpendicular to the optical axis, e.g. index or gain guiding, stripe geometry, broad area lasers, gain tailoring, transverse or lateral reflectors, special cladding structures, MQW barrier reflection layers having a ridge or stripe structure
- H01S5/223—Buried stripe structure
- H01S5/2237—Buried stripe structure with a non-planar active layer
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/30—Structure or shape of the active region; Materials used for the active region
- H01S5/34—Structure or shape of the active region; Materials used for the active region comprising quantum well or superlattice structures, e.g. single quantum well [SQW] lasers, multiple quantum well [MQW] lasers or graded index separate confinement heterostructure [GRINSCH] lasers
- H01S5/3428—Structure or shape of the active region; Materials used for the active region comprising quantum well or superlattice structures, e.g. single quantum well [SQW] lasers, multiple quantum well [MQW] lasers or graded index separate confinement heterostructure [GRINSCH] lasers layer orientation perpendicular to the substrate
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Manufacturing & Machinery (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Optics & Photonics (AREA)
- Led Devices (AREA)
- Semiconductor Lasers (AREA)
Abstract
L'invention concerne les dispositifs photoémissifs à semi-conducteur. Elle se rapporte à un dispositif photoémissif dans lequel un trou débouchant 4 est formé dans un substrat semi-conducteur 2. Une jonction pn est formée par diffusion d'impureté qui forme une région active 31. Une électrode 1 est disposée sur la région active et éventuellement sur une face du substrat 2, et une autre électrode est formée sur l'autre face. La lumière créée par la région active 31 est dirigée préférentiellement en direction perpendiculaire à la grande face du substrat 2. Application aux dispositifs d'affichage. (CF DESSIN DANS BOPI)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP60291536A JPS62150784A (ja) | 1985-12-24 | 1985-12-24 | 発光素子 |
JP61004032A JPS62162372A (ja) | 1986-01-10 | 1986-01-10 | 発光素子 |
JP61002891A JPS62162383A (ja) | 1986-01-11 | 1986-01-11 | 半導体発光装置 |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2592227A1 true FR2592227A1 (fr) | 1987-06-26 |
FR2592227B1 FR2592227B1 (fr) | 1994-02-11 |
Family
ID=27275574
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR8618156A Expired - Fee Related FR2592227B1 (fr) | 1985-12-24 | 1986-12-24 | Dispositif photoemissif a semi-conducteur de type directionnel |
Country Status (6)
Country | Link |
---|---|
US (1) | US4797890A (fr) |
CA (1) | CA1271550C (fr) |
DE (1) | DE3644380C2 (fr) |
FR (1) | FR2592227B1 (fr) |
GB (1) | GB2186425B (fr) |
NL (1) | NL8603283A (fr) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0410307A1 (fr) * | 1989-07-20 | 1991-01-30 | Canon Kabushiki Kaisha | Dispositif électroluminescent et sa méthode de fabrication |
EP0488510A2 (fr) * | 1990-11-28 | 1992-06-03 | Mitsubishi Denki Kabushiki Kaisha | Dispositif laser à émission de surface dans le visible |
EP0519226A2 (fr) * | 1991-05-21 | 1992-12-23 | Mitsubishi Denki Kabushiki Kaisha | Appareil d'enregistrement électrophotographique du type à rangée de diodes électroluminescentes |
Families Citing this family (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4906894A (en) * | 1986-06-19 | 1990-03-06 | Canon Kabushiki Kaisha | Photoelectron beam converting device and method of driving the same |
GB2203894B (en) * | 1987-03-03 | 1990-11-21 | Fumio Inaba | Surface emission type semiconductor light-emitting device |
US4901327A (en) * | 1988-10-24 | 1990-02-13 | General Dynamics Corporation, Electronics Division | Transverse injection surface emitting laser |
US4943970A (en) * | 1988-10-24 | 1990-07-24 | General Dynamics Corporation, Electronics Division | Surface emitting laser |
US4873696A (en) * | 1988-10-31 | 1989-10-10 | The Regents Of The University Of California | Surface-emitting lasers with periodic gain and a parallel driven nipi structure |
US5038356A (en) * | 1989-12-04 | 1991-08-06 | Trw Inc. | Vertical-cavity surface-emitting diode laser |
JPH06196813A (ja) * | 1992-10-14 | 1994-07-15 | Sony Corp | 半導体レーザとその製法 |
JP3586293B2 (ja) * | 1994-07-11 | 2004-11-10 | ソニー株式会社 | 半導体発光素子 |
US6107736A (en) * | 1997-06-02 | 2000-08-22 | Motorola, Inc. | Organic electroluminescent display device and method of fabrication |
US6204189B1 (en) * | 1999-01-29 | 2001-03-20 | The Regents Of The University Of California | Fabrication of precision high quality facets on molecular beam epitaxy material |
FR2809534B1 (fr) * | 2000-05-26 | 2005-01-14 | Commissariat Energie Atomique | Dispositif semiconducteur a injection electronique verticale et son procede de fabrication |
DE10250635A1 (de) * | 2002-10-30 | 2004-05-19 | Osram Opto Semiconductors Gmbh | Strahlungsemittierendes Halbleiterelement und Verfahren zu seiner Herstellung |
US7531842B2 (en) * | 2002-12-20 | 2009-05-12 | Analog Devices, Inc. | Method for etching a tapered bore in a silicon substrate, and a semiconductor wafer comprising the substrate |
TWI275222B (en) * | 2003-05-23 | 2007-03-01 | Rohm & Haas Elect Mat | External cavity semi-conductor laser and method for fabrication thereof |
US20100149805A1 (en) * | 2008-12-17 | 2010-06-17 | Fridy Joseph | Led lighting laminate with integrated cooling |
CN104332554B (zh) * | 2014-11-04 | 2017-08-04 | 浙江中博光电科技有限公司 | Led晶粒与封装结构 |
JP7400282B2 (ja) * | 2019-09-18 | 2023-12-19 | 株式会社リコー | 面発光レーザ、面発光レーザ装置、光源装置及び検出装置 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56157077A (en) * | 1980-05-08 | 1981-12-04 | Fujitsu Ltd | Semiconductor light emitting device |
JPS58184772A (ja) * | 1982-04-23 | 1983-10-28 | Toshiba Corp | 半導体発光素子およびその製造方法 |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3283207A (en) * | 1963-05-27 | 1966-11-01 | Ibm | Light-emitting transistor system |
GB1088790A (en) * | 1966-08-12 | 1967-10-25 | Standard Telephones Cables Ltd | Multiple junction semiconductor device |
DE1982065U (de) * | 1968-01-02 | 1968-03-28 | Novopan G M B H & Co Deutsche | Vorrichtung zur aufstelung und verbindung von aufrechtstehenden wandteilen. |
JPS5312288A (en) * | 1976-07-21 | 1978-02-03 | Hitachi Ltd | Light emitting semiconductor device |
FR2466866A1 (fr) * | 1979-10-05 | 1981-04-10 | Thomson Csf | Procede de couplage entre une fibre optique et une diode opto-electronique, et tete d'emission ou de reception realisee par ce procede |
CA1139412A (fr) * | 1980-09-10 | 1983-01-11 | Northern Telecom Limited | Diodes electroluminescentes a rendement quantique exterieur eleve |
JPS5844779A (ja) * | 1981-09-10 | 1983-03-15 | Toshiba Corp | 発光素子 |
US4577209A (en) * | 1982-09-10 | 1986-03-18 | At&T Bell Laboratories | Photodiodes having a hole extending therethrough |
JPH0750807B2 (ja) * | 1984-03-28 | 1995-05-31 | 東北大学長 | 接合型半導体発光素子 |
US4660207A (en) * | 1984-11-21 | 1987-04-21 | Northern Telecom Limited | Surface-emitting light emitting device |
-
1986
- 1986-12-22 CA CA526082A patent/CA1271550C/fr not_active Expired
- 1986-12-23 NL NL8603283A patent/NL8603283A/nl not_active Application Discontinuation
- 1986-12-24 DE DE3644380A patent/DE3644380C2/de not_active Expired - Fee Related
- 1986-12-24 US US06/946,324 patent/US4797890A/en not_active Expired - Fee Related
- 1986-12-24 FR FR8618156A patent/FR2592227B1/fr not_active Expired - Fee Related
- 1986-12-24 GB GB8630856A patent/GB2186425B/en not_active Expired
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56157077A (en) * | 1980-05-08 | 1981-12-04 | Fujitsu Ltd | Semiconductor light emitting device |
JPS58184772A (ja) * | 1982-04-23 | 1983-10-28 | Toshiba Corp | 半導体発光素子およびその製造方法 |
Non-Patent Citations (4)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 6, no. 37 (E-97)(915) 6 Mars 1982 & JP-A-56 157 077 ( FUJITSU K.K. ) 4 Décembre 1981 * |
PATENT ABSTRACTS OF JAPAN vol. 8, no. 21 (E-224)(1458) 28 Janvier 1984 & JP-A-58 184 772 ( TOKYO SHIBAURA DENKI K.K. ) 28 Octobre 1983 * |
TENTH EUROPEAN CONFERENCE ON OPTICAL COMMUNICATION 3 Septembre 1984, STUTTGART pages 62 - 63; S.UCHIYAMA ET AL.: 'RAISING OPERATION TEMPERATURE OF GaInAsP/InP SURFACE EMITTING LASER' * |
TENTH EUROPEAN CONFERENCE ON OPTICAL COMMUNICATION ECOC '84 3 Septembre 1984, STUTTGART pages 56 - 57; H.ITO ET AL.: 'NEW STRUCTURE OF LASER DIODE AND LIGHT EMITTING DIODE BASED ON COAXIAL TRANSVERSE JUNCTION (CTJ)' * |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0410307A1 (fr) * | 1989-07-20 | 1991-01-30 | Canon Kabushiki Kaisha | Dispositif électroluminescent et sa méthode de fabrication |
US5115284A (en) * | 1989-07-20 | 1992-05-19 | Canon Kabushiki Kaisha | Light-emitting device |
EP0488510A2 (fr) * | 1990-11-28 | 1992-06-03 | Mitsubishi Denki Kabushiki Kaisha | Dispositif laser à émission de surface dans le visible |
EP0488510A3 (en) * | 1990-11-28 | 1992-07-01 | Mitsubishi Denki Kabushiki Kaisha | Visible light surface emitting laser device |
US5166945A (en) * | 1990-11-28 | 1992-11-24 | Mitsubishi Denki Kabushiki Kaisha | Visible light surface emitting laser device |
EP0519226A2 (fr) * | 1991-05-21 | 1992-12-23 | Mitsubishi Denki Kabushiki Kaisha | Appareil d'enregistrement électrophotographique du type à rangée de diodes électroluminescentes |
EP0519226A3 (en) * | 1991-05-21 | 1993-02-24 | Mitsubishi Denki Kabushiki Kaisha | Led array head type electrophotographic recording apparatus |
Also Published As
Publication number | Publication date |
---|---|
US4797890A (en) | 1989-01-10 |
FR2592227B1 (fr) | 1994-02-11 |
DE3644380C2 (de) | 1993-11-04 |
CA1271550A (fr) | 1990-07-10 |
GB2186425A (en) | 1987-08-12 |
GB8630856D0 (en) | 1987-02-04 |
CA1271550C (fr) | 1990-07-10 |
DE3644380A1 (de) | 1987-07-02 |
NL8603283A (nl) | 1987-07-16 |
GB2186425B (en) | 1989-10-18 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |