EP0933755B1 - Geschütztes Flüssigkristallanzeigemodul, insbesondere für eine Bedienungseinheit eines Kraftfahrzeugs - Google Patents

Geschütztes Flüssigkristallanzeigemodul, insbesondere für eine Bedienungseinheit eines Kraftfahrzeugs Download PDF

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Publication number
EP0933755B1
EP0933755B1 EP99101509A EP99101509A EP0933755B1 EP 0933755 B1 EP0933755 B1 EP 0933755B1 EP 99101509 A EP99101509 A EP 99101509A EP 99101509 A EP99101509 A EP 99101509A EP 0933755 B1 EP0933755 B1 EP 0933755B1
Authority
EP
European Patent Office
Prior art keywords
display module
output
impedance
control
line
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
Application number
EP99101509A
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English (en)
French (fr)
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EP0933755A1 (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
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Filing date
Publication date
Application filed by Valeo Electronique SA filed Critical Valeo Electronique SA
Publication of EP0933755A1 publication Critical patent/EP0933755A1/de
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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
    • G09G3/34—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), including motor vehicle.
  • liquid crystal display Liquid Crystal Display
  • This invention relates more particularly to the devices for such control panels, which comprise a display module comprising a multiplicity of parallel inputs connected, via a multiplicity of control lines, to a multiplicity of outputs of a powered control module. by an electrical source, the output of the display module and the electrical source being connected to an electrical ground.
  • the control module consists mainly of electronic switches, typically made from semiconductors that do not support electrostatic discharges greater than about 2 kV. However, it often happens that discharges well above 2 kV, typically 20 or 25 kV, are generated at the liquid crystal display module, due, in particular, to the surface constraints that it can undergo.
  • an object of the invention is to provide a liquid crystal display module device which does not have the aforementioned drawback.
  • the invention proposes a device of the type described in the introduction, and in which at least one branch line is provided, on the one hand, with an input connected to the electrical source, and on the other hand, an output connected directly to the output of said display module, the branch line having an impedance significantly lower than that of each pair formed by a control line and the output of the associated control module.
  • the ratio between the impedance of a torque and the impedance of a bypass line is at least greater than 10. More preferably, this ratio is at least greater than 100, and even more preferably at least greater 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 heating and / or air conditioning system of a motor vehicle.
  • FIG. 1 We first refer to the figure 1 to describe the block diagram of a device according to the invention in a non-limiting application to a control panel of an air conditioning system of a motor vehicle.
  • the device comprises a current supply source 1 connected to the ground M, for example that of the vehicle, and intended to power an electronic module 2 comprising a control module 3 and a liquid crystal display module 4.
  • Each control line 5-i is itself connected to an output 6-i out of N outputs of the control module 3, which constitutes a switch for managing the power supply of the N parts of the display module 4.
  • this control module 3 is capable, on the order of a management unit of the installation, to supply one or more parts of the display module, or in other words to connect the outputs 6-i selected at the circuit powered by the power source 1.
  • control module 3 is made from semiconductors known to those skilled in the art, which it is therefore unnecessary to describe here.
  • the display module 4 comprises an output 7 which is connected to a floating mass MF, which is itself connected to the ground M via a coupling resistor 8.
  • the device comprises a bypass line 9 connected in parallel with the electronic module 2 so that its input 10 is connected to the power source 1, while its output 11 is connected to the floating mass MF at the output 7 of the display module 4.
  • the device therefore comprises two parallel branches, one comprising the electronic module 2, the other the bypass line 9, connected on one side to the electrical source 1 and on the other side to the floating ground MF.
  • the branch line 9 (or ground line) is chosen such that, seen from the side of the mass, it has an impedance Z M that is significantly smaller than an impedance Z A representative of the sum of the impedance of a line of control and the output impedance of the switch to which it is connected, seen from the side of the mass.
  • output of a switch is meant here 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 higher than that of Z M , and still more preferably at least a thousand times higher.
  • this value of Z A is at least a hundred times higher than that of Z M , and still more preferably at least a thousand times higher.
  • the display module 4 and the control module 3 are in the form of an integrated circuit.
  • bypass line 9 can be directly connected to a grounding zone 12 formed on the surface of the printed circuit forming the display module 4 and it itself connected to the output 7.
  • the control lines 5-i and bypass 9 can be made in the same way, that is to say in the form of semi-rigid electrical conductors (for example conductive metal tabs), and together form a connection mat, as shown in FIG. figure 3 .
  • the control module 3 must comprise a bypass output 14 connected directly to its input 15 connected to the power source 1, so that the input 10 of the bypass 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)

Claims (9)

  1. Vorrichtung mit Flüssigkristall-Anzeigemodul von der Art, die ein Anzeigemodul (4) enthält, das eine Vielzahl von parallelen Eingängen aufweist, die über eine Vielzahl von Steuerleitungen (5-i) mit einer Vielzahl von Ausgängen (6-i) eines Steuermoduls (3) verbunden sind, das von einer Stromquelle (1) gespeist wird, wobei die Stromquelle (1) mit einer elektrischen Masse (M) verbunden ist und ein Ausgang (7) des Anzeigemoduls mit der elektrischen Masse (M) über eine schwebende Masse (MF) verbunden ist, dadurch gekennzeichnet, dass sie mindestens eine Abzweigleitung (9-i) enthält, die mit einem Eingang (10), der mit der Stromquelle (1) verbunden ist, und mit einem Ausgang (11) versehen ist, der direkt mit dem Ausgang (7) des Anzeigemoduls (4) verbunden ist, wobei die Abzweigleitung (9-i) eine Impedanz (ZM) aufweist, die deutlich geringer ist als die Impedanzen (ZA) jedes von einer Steuerleitung (5-i) und dem zugeordneten Ausgang (6-i) des Steuermoduls (3) gebildeten Paars.
  2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass das Verhältnis zwischen der Impedanz eines Paars (ZA) und der Impedanz einer Abzweigleitung (ZM) mindestens höher als 10 ist.
  3. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, dass das Verhältnis mindestens höher als 100 und insbesondere mindestens höher als 1000 ist.
  4. Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Steuerleitung (5-i) ein elektrisch leitendes Verbindungselement ist.
  5. Vorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Abzweigleitung (9-i) ein elektrisch leitendes Verbindungselement ist.
  6. Vorrichtung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass das Anzeigemodul (4) eine Erdungszone (12-j) enthält, die mit seinem Ausgang (7) verbunden ist und mit der die Abzweigleitung (9-j) verbunden ist.
  7. Vorrichtung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass das Steuermodul (3) einen Abzweigausgang (14) enthält, der mit seinem von der Stromquelle (1) gespeisten Eingang (15) verbunden und angeordnet ist, um mit dem Eingang (10) der Abzweigleitung (9) verbunden zu werden.
  8. Vorrichtung nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass der Ausgang (4) des Anzeigemoduls (4) mit der Masse (M) über einen Kopplungswiderstand (8) verbunden ist.
  9. Vorrichtung nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass sie Teil eines Bedienfelds einer Heizungs- und/oder Klimatisierungsanlage eines Kraftfahrzeugs ist.
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 EP0933755A1 (de) 1999-08-04
EP0933755B1 true EP0933755B1 (de) 2010-03-10

Family

ID=9522335

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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

Family Cites Families (7)

* 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
JPS6318333A (ja) * 1986-07-11 1988-01-26 Hitachi Ltd 液晶表示装置
DE3800572A1 (de) 1987-10-30 1989-07-20 Vdo Schindling Kombinationsinstrument fuer kraftfahrzeuge
DE3736761A1 (de) * 1987-10-30 1989-05-11 Vdo Schindling Kombinationsinstrument fuer kraftfahrzeuge
JP3223614B2 (ja) * 1992-12-22 2001-10-29 松下電器産業株式会社 液晶表示装置
EP1211663A1 (de) * 1994-12-14 2002-06-05 Canon Kabushiki Kaisha Anzeigeinrichtung mit Massenleitungen mit niedriger elektromagnetischer Induktion
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

Also Published As

Publication number Publication date
FR2774203A1 (fr) 1999-07-30
ES2342699T3 (es) 2010-07-12
FR2774203B1 (fr) 2000-03-31
DE69942112D1 (de) 2010-04-22
US6317172B1 (en) 2001-11-13
EP0933755A1 (de) 1999-08-04

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