DE4035360A1 - Liquid crystal display cell - has precious metal layer overlying conductor path pattern carried by projecting part of larger surface area plate - Google Patents

Liquid crystal display cell - has precious metal layer overlying conductor path pattern carried by projecting part of larger surface area plate

Info

Publication number
DE4035360A1
DE4035360A1 DE19904035360 DE4035360A DE4035360A1 DE 4035360 A1 DE4035360 A1 DE 4035360A1 DE 19904035360 DE19904035360 DE 19904035360 DE 4035360 A DE4035360 A DE 4035360A DE 4035360 A1 DE4035360 A1 DE 4035360A1
Authority
DE
Germany
Prior art keywords
layer
liquid crystal
metal layer
crystal display
surface area
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.)
Ceased
Application number
DE19904035360
Other languages
German (de)
Inventor
Aldo Coniglio
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.)
BMG Gesellschaft fuer moderne Informationssysteme mbH
Original Assignee
Licentia Patent Verwaltungs GmbH
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 Licentia Patent Verwaltungs GmbH filed Critical Licentia Patent Verwaltungs GmbH
Priority to DE19904035360 priority Critical patent/DE4035360A1/en
Publication of DE4035360A1 publication Critical patent/DE4035360A1/en
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1345—Conductors connecting electrodes to cell terminals
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1343—Electrodes
    • G02F1/13439—Electrodes characterised by their electrical, optical, physical properties; materials therefor; method of making

Abstract

The display cell has a liquid crystal layer sandwiched between a relatively large and a relatively small surface area glass plate (1,5), the conductor paths (8) carried by the projecting part (3) of the larger surface area glass plate (1) comprising an indicia tin oxide layer and a vapour deposited nickel layer. A precious metal layer is applied over the nickel layer of at least part of the conductor path pattern carried by the projecting part (3). Preferably, circuit components (9) are applied to the conductor path pattern after application of the precious metal layer. ADVANTAGE - Improved conductivity and resistance characteristics.

Description

Die vorliegende Erfindung betrifft eine Flüssigkristall­ zelle nach dem Oberbegriff des Patentanspruches 1.The present invention relates to a liquid crystal Cell according to the preamble of claim 1.

Bei FK-Anzeigen (Flüssigkristallanzeige-Vorrichtungen) ist bereits vorgeschlagen worden, auf dem überstehenden Teil der größeren Deckplatte die aus einer ITO-Schicht (Indium- Zinnoxid-Schicht) bestehenden Leiterbahnen zumindest teil­ weise durch eine stromlos aufgebrachte Metallschicht, die bevorzugt eine Nickelschicht ist, zu verstärken. Eine sol­ che verstärkte Leiterbahnenschicht besitzt einen geringe­ ren elektrischen Widerstand pro Flächeneinheit, ist besser lötfähig und besitzt auf dem Glassubstrat eine gute Haft­ festigkeit. Der vorliegenden liegt die Aufgabe zugrunde, die Leitfähigkeit und die Widerstandsfähigkeit gegen Umwelteinflüsse noch weiter zu verbessern.For FK displays (liquid crystal display devices) already suggested on the protruding part the larger cover plate made of an ITO layer (indium Tin oxide layer) existing conductor tracks at least partially by an electrolessly applied metal layer that is preferably a nickel layer to reinforce. A sol che reinforced conductor layer has a low their electrical resistance per unit area is better solderable and adheres well to the glass substrate strength. The task at hand is this  based on conductivity and resilience to further improve against environmental influences.

Diese Aufgabe wird durch die im Kennzeichen des Pa­ tentanspruches 1 angegebenen Merkmale gelöst. Anhand des in der Figur schematisch dargestellten Ausfüh­ rungsbeispiels wird die Erfindung nachfolgend näher erläu­ tert.This object is achieved by the features specified in the characterizing part of Pa tent Claim 1 . Based on the exemplary embodiment schematically shown in the figure, the invention is explained in more detail below.

Die Figur zeigt im Querschnitt eine FK-Anzeige mit einer kleineren Deckplatte 5 und einer größeren Deckplatte 1 zwischen welchen eine Flüssigkristallschicht 10 einge­ schlossen ist. Die beiden Deckplatten 1 und 5 sind durch eine Kleber- oder Lotnaht 7 miteinander verbunden. Inner­ halb der FK-Zelle, die die eigentliche Anzeigezelle bil­ det, befinden sich in bekannter Weise aus ITO-Schichten bestehende Leiterbahnen 4 und 6.The figure shows in cross section an LC display with a smaller cover plate 5 and a larger cover plate 1 between which a liquid crystal layer 10 is closed. The two cover plates 1 and 5 are connected to one another by an adhesive or solder seam 7 . Within the LC cell, which forms the actual display cell, there are conductor tracks 4 and 6 consisting of ITO layers in a known manner.

Auf dem überstehenden Teil 3 der größeren aus Glas beste­ henden Deckplatte 1 befinden sich Leiterbahnen 8, die z. B. mit Schaltkreisen 9 verbunden sind. Diese Leiterbahnen 8 bestehen aus ITO-Schichten, auf den zusätzlich Nickel stromlos abgeschieden ist. Die Leiterbahnen 8 werden da­ durch in ihrem elektrischen Widerstand verringert und be­ züglich ihrer Lötfähigkeit verbessert.On the protruding part 3 of the larger glass best existing cover plate 1 there are conductor tracks 8 , the z. B. are connected to circuits 9 . These conductor tracks 8 consist of ITO layers, on which nickel is additionally deposited without current. The conductor tracks 8 are reduced by their electrical resistance and improved with respect to their solderability.

Gemäß der Erfindung wird nun auf der Nickelschicht der Leiterbahnen 8 zusätzlich eine Edelmetallschicht stromlos abgeschieden. Bevorzugt wird eine Goldschicht von 0,1 µm bis 0,25 µm Dicke abgeschieden. Durch diese Edelmetall­ schicht wird die Leitfähigkeit der Leiterbahnen 8 noch weiter verbessert und die Lötfähigkeit ebenfalls verbes­ sert. Zusätzlich wird die Empfindlichkeit der Leiterbahnen gegen Umwelteinflüsse verringert.According to the invention, a noble metal layer is now additionally electrolessly deposited on the nickel layer of the conductor tracks 8 . A gold layer of 0.1 μm to 0.25 μm thickness is preferably deposited. Through this precious metal layer, the conductivity of the conductor tracks 8 is further improved and the solderability is also improved. In addition, the sensitivity of the conductor tracks to environmental influences is reduced.

Die ITO-Schichten werden bevorzugt durch Aufdampfen oder Sputtern hergestellt. Die Nickelschicht und die Edelme­ tallschicht werden bevorzugt in Bädern stromlos abgeschie­ den, nachdem die Oberflächen der ITO-Schicht bzw. der Nic­ kelschicht z. B. mit Palladium aktiviert worden sind. Auf die mit der Edelmetallschicht verstärkten Leiterbahnen 8 werden dann z. B. in dem bekannten TAB-Verfahren (tape automated bonding) Anschlüsse und Schaltkreise 9 angebon­ det bzw. aufgelötet.The ITO layers are preferably produced by vapor deposition or sputtering. The nickel layer and the Edelme tallschicht are preferably electrolessly deposited in the baths after the surfaces of the ITO layer or the Nic kelschicht z. B. have been activated with palladium. On the conductor tracks 8 reinforced with the noble metal layer, z. B. in the known TAB method (tape automated bonding) connections and circuits 9 are attached or soldered.

Claims (4)

1. Flüssigkristall-Anzeigevorrichtung mit einer zwischen einer kleineren Deckplatte und einer größeren Deckplatte aus Glas eingeschlossenen Flüssigkristallschicht und einem Leiterbahnenmuster auf dem überstehenden Teil der größeren Deckplatte, das aus einer ITO-Schicht und einer darauf stromlos abgeschiedenen Nickelschicht besteht, dadurch ge­ kennzeichnet, daß zumindest auf einem Teil des Leiterbah­ nenmusters (8) auf dem überstehenden Teil (3) der größeren Deckplatte (1) auf der Nickelschicht stromlos eine Edelme­ tallschicht abgeschieden ist.1. Liquid crystal display device with a liquid crystal layer enclosed between a smaller cover plate and a larger cover plate made of glass and a conductor pattern on the protruding part of the larger cover plate, which consists of an ITO layer and an electrolessly deposited nickel layer, characterized in that at least on a part of the conductor pattern ( 8 ) on the protruding part ( 3 ) of the larger cover plate ( 1 ) a noble metal layer is deposited electrolessly on the nickel layer. 2. Flüssigkristall-Anzeigevorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Edelmetallschicht eine Palladiumschicht, Platinschicht oder insbesondere eine Goldschicht ist. 2. A liquid crystal display device according to claim 1, characterized in that the noble metal layer a Palladium layer, platinum layer or in particular one Gold layer is.   3. Flüssigkristall-Anzeigevorrichtung nach Anspruch 1 oder Anspruch 2, dadurch gekennzeichnet, daß die Edelme­ tallschicht eine Dicke von 0,1 µm bis 0,25 µm besitzt.3. A liquid crystal display device according to claim 1 or claim 2, characterized in that the Edelme tallschicht has a thickness of 0.1 microns to 0.25 microns. 4. Flüssigkristall-Anzeigevorrichtung nach einem der An­ sprüche 1 bis 3, dadurch gekennzeichnet, daß nach Aufbrin­ gen der Edelmetallschicht auf die Leiterbahnen (8) auf dem überstehenden Teil (3) der größeren Deckplatte (1) Schalt­ kreise (9) und dergleichen aufgebracht und deren An­ schlüsse angebondet oder angelötet werden.4. Liquid crystal display device according to one of claims 1 to 3, characterized in that after Aufbrin gene the noble metal layer on the conductor tracks ( 8 ) on the protruding part ( 3 ) of the larger cover plate ( 1 ) circuits ( 9 ) and the like applied and their connections are bonded or soldered on.
DE19904035360 1990-11-07 1990-11-07 Liquid crystal display cell - has precious metal layer overlying conductor path pattern carried by projecting part of larger surface area plate Ceased DE4035360A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19904035360 DE4035360A1 (en) 1990-11-07 1990-11-07 Liquid crystal display cell - has precious metal layer overlying conductor path pattern carried by projecting part of larger surface area plate

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19904035360 DE4035360A1 (en) 1990-11-07 1990-11-07 Liquid crystal display cell - has precious metal layer overlying conductor path pattern carried by projecting part of larger surface area plate

Publications (1)

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DE4035360A1 true DE4035360A1 (en) 1992-05-14

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4209072A1 (en) * 1992-03-20 1993-09-23 Licentia Gmbh Stress free liquid crystal display system - embeds connections from conductors to printed circuit board leads in e.g. epoxy] resin which is cured in UV and unheated

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2807350A1 (en) * 1977-03-02 1978-08-24 Sharp Kk LIQUID CRYSTAL DISPLAY DEVICE IN UNIT WITH AN INTEGRATED CIRCUIT
DE3151557A1 (en) * 1981-12-28 1983-07-21 SWF-Spezialfabrik für Autozubehör Gustav Rau GmbH, 7120 Bietigheim-Bissingen ELECTRO-OPTICAL DISPLAY DEVICE AND METHOD FOR THEIR PRODUCTION
DE3306154A1 (en) * 1983-02-22 1984-08-23 Siemens AG, 1000 Berlin und 8000 München Solderable layer system, process for producing it and its use
DE3705251A1 (en) * 1987-02-19 1988-09-01 Standard Elektrik Lorenz Ag METHOD FOR PRODUCING A CURRENTLY DEPOSITABLE, SOLBABLE METAL LAYER
US4853296A (en) * 1986-10-22 1989-08-01 Toppan Printing Co., Ltd. Electrode plate for color display device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2807350A1 (en) * 1977-03-02 1978-08-24 Sharp Kk LIQUID CRYSTAL DISPLAY DEVICE IN UNIT WITH AN INTEGRATED CIRCUIT
DE3151557A1 (en) * 1981-12-28 1983-07-21 SWF-Spezialfabrik für Autozubehör Gustav Rau GmbH, 7120 Bietigheim-Bissingen ELECTRO-OPTICAL DISPLAY DEVICE AND METHOD FOR THEIR PRODUCTION
DE3306154A1 (en) * 1983-02-22 1984-08-23 Siemens AG, 1000 Berlin und 8000 München Solderable layer system, process for producing it and its use
US4853296A (en) * 1986-10-22 1989-08-01 Toppan Printing Co., Ltd. Electrode plate for color display device
DE3705251A1 (en) * 1987-02-19 1988-09-01 Standard Elektrik Lorenz Ag METHOD FOR PRODUCING A CURRENTLY DEPOSITABLE, SOLBABLE METAL LAYER

Non-Patent Citations (5)

* Cited by examiner, † Cited by third party
Title
2 - 33128 A. P-1036 April 13, 1990 Vol.14/No.185 *
2 - 46426 A. P-1043 April 26, 1990 Vol.14/No.207 *
63-106627 A. P- 761 Sept. 22, 1988 Vol.12/No.354 *
63-289533 A. P- 845 March 22, 1989 Vol.13/No.116 *
PATENTS ABSTRACT OF JAPAN: 63-75731 A. P- 746 Aug. 18, 1988 Vol.12/No.303 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4209072A1 (en) * 1992-03-20 1993-09-23 Licentia Gmbh Stress free liquid crystal display system - embeds connections from conductors to printed circuit board leads in e.g. epoxy] resin which is cured in UV and unheated

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Legal Events

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OM8 Search report available as to paragraph 43 lit. 1 sentence 1 patent law
8127 New person/name/address of the applicant

Owner name: AEG GESELLSCHAFT FUER MODERNE INFORMATIONSSYSTEME

8110 Request for examination paragraph 44
8131 Rejection