EP0933755A1 - Geschütztes Flüssigkristallanzeigemodul, insbesondere für eine Bedienungseinheit eines Kraftfahrzeugs - Google Patents

Geschütztes Flüssigkristallanzeigemodul, insbesondere für eine Bedienungseinheit eines Kraftfahrzeugs Download PDF

Info

Publication number: EP0933755A1
Authority: EP; European Patent Office
Prior art keywords: output; display module; module; impedance; branch line
Prior art date: 1998-01-29
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

Application number

EP99101509A

Other languages

English (en)

French (fr)

Other versions

EP0933755B1 (de

Inventor

Tan Duc Huynh

Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)

Valeo Interior Controls SAS

Original Assignee

Valeo Electronique SA

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.)

1998-01-29

Filing date

1999-01-28

Publication date

1999-08-04

1999-01-28 Application filed by Valeo Electronique SA filed Critical Valeo Electronique SA

1999-08-04 Publication of EP0933755A1 publication Critical patent/EP0933755A1/de

2010-03-10 Application granted granted Critical

2010-03-10 Publication of EP0933755B1 publication Critical patent/EP0933755B1/de

2019-01-28 Anticipated expiration legal-status Critical

Status Expired - Lifetime legal-status Critical Current

Images

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
- 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

Definitions

the invention relates to the field of control panels with liquid crystal display ("Liquid Crystal Display” in English), especially for motor vehicles.
This invention relates more particularly to devices for such control panels, which include a display module with multiple inputs connected parallels, via a multiplicity of lines of command, to a multiplicity of outputs of a module control powered by an electrical source, the output of the display module and the electrical source being connected to an electrical ground.
the control module mainly consists of electronic switches, usually made from of semiconductors which do not support discharges electrostatic above about 2 kV. Now, it happens frequently that discharges well above 2 kV, typically 20 or 25 kV, are generated at the module level liquid crystal display, in particular due to surface constraints that it can undergo.
the invention provides for this purpose a device of the type described in the introduction, and in which at least one branch line provided, on the one hand, with a connected input to the electrical source, and secondly, to an output connected directly to the output of said display module, the bypass line having a significantly impedance less than that of each pair formed by a line of command and the associated command module output.
the relationship between the impedance of a couple and the impedance of a bypass line is at least greater than 10. More preferably, this ratio is at less than 100, and even more preferably at less than 1000.
the output of the display module is preferably connected to ground via a coupling resistor.
the invention is particularly applicable to devices intended to be part of a control panel of a vehicle heating and / or air conditioning system automobile.
Figure 1 We first refer to Figure 1 to describe the block diagram of a device according to the invention in non-limiting application to a control panel an air conditioning system for a motor vehicle.
the device includes a current supply source 1 connected to earth M, for example that of the vehicle, and intended to supply an electronic module 2 comprising a control module 3 and a crystal display module liquids 4.
Each 5-i command line is itself connected to an output 6-i among N outputs of the control module 3, which constitutes a switch intended manage the power supply of the N parts of the display module 4.
this control module 3 is capable, on the order of an installation management unit, to supply one or more parts of the display module, or other words to connect the selected 6-i outputs to the circuit supplied by the power source 1.
control module 3 is produced from semiconductors known to those skilled in the art, that it is therefore unnecessary to describe here.
the display module 4 includes an output 7 which is connected to a floating mass MF, which is itself connected to earth M via a coupling resistor 8.
the device comprises a line of bypass 9 mounted in parallel with the electronic module 2 so that its input 10 is connected to the source supply 1, while its output 11 is connected to the floating mass MF at output 7 of the module display 4.
the device therefore comprises two parallel branches, one comprising the electronic module 2, the other the branch line 9, connected on one side to the source electric 1 and on the other side to the floating mass MF.
the branch line 9 (or ground line), is chosen so that viewed from the side of the ground, it has an impedance Z M significantly less than an impedance Z A representative of the sum of the impedance of a line of control and output impedance of the switch to which it is connected, viewed from the ground side.
the expression “output of a switch” is understood here to mean an output 6-i of the control module 3.
the impedance Z A of the branch containing the electronic module 2 is at least 10 times greater than the value of the impedance Z M of the branch branch 9. More preferably, this value of Z A is at least a hundred times greater than that of Z M , and even more preferably, at least a thousand times greater.
branch line 9 it is possible, when an electrostatic discharge occurs at the terminals of the display module 4, for example in the event of pressure generated by a user, to evacuate to ground M, via branch line 9, the high voltage generated this discharge.
the display module 4 and the display module control 3 are produced in the form of an integrated circuit.
the branch line 9 can be directly connected to a grounding zone 12 formed on the surface of the printed circuit forming the module display 4 and itself connected to output 7. This simplifies the device, since the lines of 5-i and bypass 9 control can be performed from the same way, i.e. in the form of conductors semi-rigid electrics (e.g. metal legs conductive), and together form a connection sheet, as illustrated in Figure 3.
the control module 3 must include an output of bypass 14 connected directly to its connected input 15 to power source 1, so that input 10 of the branch line 9 can be easily connected to this same source 1.

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Engineering & Computer Science (AREA)
Chemical & Material Sciences (AREA)
Crystallography & Structural Chemistry (AREA)
Physics & Mathematics (AREA)
Computer Hardware Design (AREA)
General Physics & Mathematics (AREA)
Theoretical Computer Science (AREA)
Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Liquid Crystal (AREA)

EP99101509A 1998-01-29 1999-01-28 Geschütztes Flüssigkristallanzeigemodul, insbesondere für eine Bedienungseinheit eines Kraftfahrzeugs Expired - Lifetime EP0933755B1 (de)

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
FR9800997		1998-01-29
FR9800997A FR2774203B1 (fr)	1998-01-29	1998-01-29	Dispositif a module d'affichage a cristaux liquides, protege, notamment pour tableau de commande d'une installation de vehicule automobile

Publications (2)

Publication Number	Publication Date
EP0933755A1 true EP0933755A1 (de)	1999-08-04
EP0933755B1 EP0933755B1 (de)	2010-03-10

Family

ID=9522335

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP99101509A Expired - Lifetime EP0933755B1 (de)	1998-01-29	1999-01-28	Geschütztes Flüssigkristallanzeigemodul, insbesondere für eine Bedienungseinheit eines Kraftfahrzeugs

Country Status (5)

Country	Link
US (1)	US6317172B1 (de)
EP (1)	EP0933755B1 (de)
DE (1)	DE69942112D1 (de)
ES (1)	ES2342699T3 (de)
FR (1)	FR2774203B1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
GB0215125D0 (en) *	2002-06-28	2002-08-07	Delphi Tech Inc	Control method for a liquid crystal display
US7310071B2 (en) *	2002-10-18	2007-12-18	Kopin Corporation	Instrument panel with active display
TW578446B (en) *	2003-03-04	2004-03-01	Benq Corp	Electronic device and anti-ESD method thereof

Citations (4)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
JPS6318333A (ja) *	1986-07-11	1988-01-26	Hitachi Ltd	液晶表示装置
DE3736761A1 (de) *	1987-10-30	1989-05-11	Vdo Schindling	Kombinationsinstrument fuer kraftfahrzeuge
JPH06186592A (ja) *	1992-12-22	1994-07-08	Matsushita Electric Ind Co Ltd	液晶表示装置およびその製造方法
EP0717390A2 (de) *	1994-12-14	1996-06-19	Canon Kabushiki Kaisha	Anzeigegerät mit einer Referenzpotential-Verdichtung

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
EP0121149B1 (de) *	1983-03-31	1987-09-02	Koninklijke Philips Electronics N.V.	Elektrische Kontaktanordnung für Flüssigkristall-Anzeigezellen
DE3800572A1 (de)	1987-10-30	1989-07-20	Vdo Schindling	Kombinationsinstrument fuer kraftfahrzeuge
JP3643640B2 (ja) *	1995-06-05	2005-04-27	株式会社東芝	表示装置及びこれに使用されるｉｃチップ

1998
- 1998-01-29 FR FR9800997A patent/FR2774203B1/fr not_active Expired - Lifetime
1999
- 1999-01-27 US US09/238,121 patent/US6317172B1/en not_active Expired - Lifetime
- 1999-01-28 DE DE69942112T patent/DE69942112D1/de not_active Expired - Lifetime
- 1999-01-28 EP EP99101509A patent/EP0933755B1/de not_active Expired - Lifetime
- 1999-01-28 ES ES99101509T patent/ES2342699T3/es not_active Expired - Lifetime

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
JPS6318333A (ja) *	1986-07-11	1988-01-26	Hitachi Ltd	液晶表示装置
DE3736761A1 (de) *	1987-10-30	1989-05-11	Vdo Schindling	Kombinationsinstrument fuer kraftfahrzeuge
JPH06186592A (ja) *	1992-12-22	1994-07-08	Matsushita Electric Ind Co Ltd	液晶表示装置およびその製造方法
EP0717390A2 (de) *	1994-12-14	1996-06-19	Canon Kabushiki Kaisha	Anzeigegerät mit einer Referenzpotential-Verdichtung

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 012, no. 224 (P - 721) 25 June 1988 (1988-06-25) *
PATENT ABSTRACTS OF JAPAN vol. 018, no. 532 (P - 1810) 7 October 1994 (1994-10-07) *

Also Published As

Publication number	Publication date
ES2342699T3 (es)	2010-07-12
EP0933755B1 (de)	2010-03-10
FR2774203A1 (fr)	1999-07-30
US6317172B1 (en)	2001-11-13
FR2774203B1 (fr)	2000-03-31
DE69942112D1 (de)	2010-04-22

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EP0793403B1 (de)	2001-12-19	Verbesserung von LED-Schaltungen, insbesondere für Kraftfahrzeuge, Stoplichter und Steuerungspanele
FR2893456A1 (fr)	2007-05-18	Systeme de distribution electrique et contacteur embarque modulaire de forte puissance pour celui-ci.
FR2721890A1 (fr)	1996-01-05	Dispositif a circuit electrique de direction assistee
FR2808131A1 (fr)	2001-10-26	Connecteur electrique
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WO2018078175A1 (fr)	2018-05-03	Interface de commande capacitive et rétroéclairée pour véhicule automobile
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FR3009667A1 (fr)	2015-02-13	Procede de fabrication d'une carte de circuit imprime pour retroviseur de vehicule
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FR2718569A1 (fr)	1995-10-13	Circuit de protection assurant la protection des circuits intégrés contre les décharges électrostatiques (ESD).
FR2793990A1 (fr)	2000-11-24	Boitier electronique sur plaque et procede de fabrication d'un tel boitier
WO2003025591A1 (fr)	2003-03-27	Dispositif indicateur de presence tension et appareil electrique comportant un tel indicateur
FR2779889A1 (fr)	1999-12-17	Detecteur de contact par effet capacitif
FR2623319A1 (fr)	1989-05-19	Dispositif pour eclairer des dispositifs d'affichage passifs d'informations notamment des dispositifs d'affichage a cristaux liquides
EP1309005A1 (de)	2003-05-07	Schutz einer integrierten Schaltung gegen ESD und andere Überspannungen
FR2741230A3 (fr)	1997-05-16	Dispositif de connexion
EP0241067B1 (de)	1991-01-23	Filterschaltung für Metalloxyd-Halbleiter integrierte Einrichtung und ihre Anwendung in einer solchen Einrichtung
FR3040526A1 (fr)	2017-03-03	Element de commutation pour plaque de distribution d'energie electrique et boitier de distribution d'energie electrique dote d'un tel element de commutation
EP3288185B1 (de)	2020-01-01	Elektrisches schaltgerät, das mit einer verbesserten elektrischen verbindungsvorrichtung ausgestattet ist
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