FR2637110A1 - Improved electro-optical cell - Google Patents
Improved electro-optical cell Download PDFInfo
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- FR2637110A1 FR2637110A1 FR8812639A FR8812639A FR2637110A1 FR 2637110 A1 FR2637110 A1 FR 2637110A1 FR 8812639 A FR8812639 A FR 8812639A FR 8812639 A FR8812639 A FR 8812639A FR 2637110 A1 FR2637110 A1 FR 2637110A1
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- cell
- blade
- connection means
- control device
- electro
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- 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
- G02F1/13452—Conductors connecting driver circuitry and terminals of panels
-
- 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
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/30—Assembling printed circuits with electric components, e.g. with resistor
- H05K3/32—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits
- H05K3/321—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits by conductive adhesives
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/09—Shape and layout
- H05K2201/09145—Edge details
- H05K2201/0919—Exposing inner circuit layers or metal planes at the side edge of the PCB or at the walls of large holes
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
- H05K2201/10227—Other objects, e.g. metallic pieces
- H05K2201/10287—Metal wires as connectors or conductors
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
- H05K2201/10227—Other objects, e.g. metallic pieces
- H05K2201/1034—Edge terminals, i.e. separate pieces of metal attached to the edge of the PCB
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
- H05K2201/10227—Other objects, e.g. metallic pieces
- H05K2201/10386—Clip leads; Terminals gripping the edge of a substrate
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
- H05K2201/10613—Details of electrical connections of non-printed components, e.g. special leads
- H05K2201/10954—Other details of electrical connections
- H05K2201/10962—Component not directly connected to the PCB
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/30—Assembling printed circuits with electric components, e.g. with resistor
- H05K3/32—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits
- H05K3/34—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits by soldering
- H05K3/3405—Edge mounted components, e.g. terminals
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)
Abstract
Description
CELLULE ELECTRO-OPTIQUE PERFECTIONNEE
L'invention concerne une cellule electro-optique perfectionnée, et plus particulièrement des moyens de connexion destines a etablir une liaison électrique respectivement entre les électrodes de la cellule et son dispositif de commande.IMPROVED ELECTRO-OPTICAL CELL
The invention relates to an improved electro-optical cell, and more particularly to connection means intended to establish an electrical connection respectively between the electrodes of the cell and its control device.
Une cellule électro-optique, telle qu'une cellule a cristal liquide décrite notamment dans les brevets US 3 781 087 et
US 3 781 088 comprend généralement un film de cristal liquide intercalé entre deux lames de verre recouvertes chacune sur leur face en regard d'électrodes reliees a un dispositif de commande. Les lames sont réunies entre elles par un cadre de scellement s'etendant le long du pourtour de ces dernières. Les electrodes sont recouvertes d'une premiere couche dite couche diélectrique, et d'une seconde couche dite couche d'alignement. La premiere couche est destinée a augmenter la resistivité de la cellule tandis que la seconde couche permet d'orienter les molécules du cristal qui se trouvent dans son voisinage dans une direction homogene parallele aux lames.An electro-optical cell, such as a liquid crystal cell described in particular in US Patents 3,781,087 and
US 3,781,088 generally comprises a liquid crystal film interposed between two glass slides, each covered on their face opposite electrodes connected to a control device. The blades are joined together by a sealing frame extending along the periphery of the latter. The electrodes are covered with a first layer called the dielectric layer, and with a second layer called the alignment layer. The first layer is intended to increase the resistivity of the cell while the second layer makes it possible to orient the molecules of the crystal which are in its vicinity in a homogeneous direction parallel to the plates.
Pour procéder à la connexion electrique entre les electrodes et le dispositif de commande, (a l'aide d'une soudure ou analogue), on décale légèrement les lames l'une par rapport l'autre si bien que l'on peut accéder directement a une partie plane des électrodes et réaliser aisément la connexion sur la surface ainsi dégagée. To make the electrical connection between the electrodes and the control device, (using a solder or the like), the blades are slightly shifted relative to each other so that one can directly access has a flat part of the electrodes and easily make the connection on the surface thus cleared.
Cependant, une telle technique nécessite des opérations de preparation de la surface sur laquelle on désire connecter. However, such a technique requires operations to prepare the surface to which one wishes to connect.
En effet, les deux dépôts superficiels qui recouvrent les electrodes constituent une couche isolante a travers laquelle il est difficile de realiser un contact satisfaisant. Pour pallier ce problème, on est contraint de réaliser un masquage au moment du depôt des couches superficielles afin de rendre les électrodes directement accessibles a des endroits determines en vue de leur connexion ultérieure. Indeed, the two surface deposits which cover the electrodes constitute an insulating layer through which it is difficult to achieve satisfactory contact. To overcome this problem, it is forced to carry out a masking at the time of deposition of the surface layers in order to make the electrodes directly accessible at determined locations for their subsequent connection.
Par conséquent, un tel dépôt sélectif nécessite des opérations supplémentaires coûteuses et consommatrices de temps qu'i; convient de supprimer. Consequently, such a selective deposit requires additional operations which are costly and time consuming than i; should be deleted.
Une autre possibilité pour pallier le probleme evoqué ci-dessus consiste a éliminer selectivement la couche isolante en masquant le reste de la surface par un procédé du type photolithographique. Cela conduit la encore a des opérations longues et coûteuses. Another possibility to alleviate the problem mentioned above consists in selectively eliminating the insulating layer by masking the rest of the surface by a process of the photolithographic type. This again leads to long and costly operations.
Enfin, une solution moins technologique consiste a gratter cette couche isolante, mais compte tenu des epaisseurs des couches (de l'ordre de quelques centaines d'Angströms), la discrimination de celles-ci lors du grattage est impossible et le contact que l'on obtient n'est pas non plus satisfaisant. Finally, a less technological solution consists in scraping this insulating layer, but taking into account the thicknesses of the layers (of the order of a few hundred Angstroms), the discrimination of these during scraping is impossible and the contact only neither is obtained satisfactory.
L'invention a donc pour but principal de remédier aux inconvenients de l'art antérieur decrit ci-dessus en fournissant une cellule electro-optique perfectionnee dont la connexion des electrodes avec le dispositif de commande est réalisée de facon simple, rapide et economique. The main object of the invention is therefore to remedy the drawbacks of the prior art described above by providing an improved electro-optical cell, the connection of the electrodes with the control device being carried out in a simple, rapid and economical manner.
A cet effet, la présente invention a pour objet une cellule électro-optique comprenant
- une premiere lame avant transparente,
- une seconde lame arriere,
- un cadre de scellement interpose entre lesdites première et seconde lames,
- au moins une électrode s'étendant a la surface de chaque lame venant au moins partiellement affleurer la tranche de la lame correspondante pour y définir une zone de contact,
- une matiere dont les caractéristiques électro-optiques sont susceptibles d'être modifiées par un signal de commande, emprisonnée dans le volume défini par les lames et le cadre de scellement,
- lesdites électrodes étant destinées a être reliées a un dispositif de commande pour y appliquer sélectivement ledit signal de commande,
- et des moyens de connexion pour établir des liaisons électriques respectivement entre chaque électrode et ledit dispositif de commande.To this end, the present invention relates to an electro-optical cell comprising
- a first transparent front blade,
- a second rear blade,
a sealing frame interposed between said first and second blades,
- at least one electrode extending on the surface of each blade coming at least partially flush with the edge of the corresponding blade to define a contact zone there,
- a material whose electro-optical characteristics are liable to be modified by a control signal, trapped in the volume defined by the blades and the sealing frame,
said electrodes being intended to be connected to a control device for selectively applying said control signal thereto,
- And connection means for establishing electrical connections respectively between each electrode and said control device.
Conformément a l'invention, lesdits moyens de connexion comprennent un plot de contact réalisé en une matière adhésive synthétique chargée de particules conductrices et apportée sur la tranche de chaque lame dans ladite zone de contact, ledit plot de contact assurant a la fois la liaison électrique et la liaison mécanique avec au moins un autre élément desdits moyens de connexion. According to the invention, said connection means comprise a contact pad made of a synthetic adhesive material charged with conductive particles and brought on the edge of each blade in said contact zone, said contact pad ensuring both the electrical connection and the mechanical connection with at least one other element of said connection means.
Ainsi, on assure une connexion simple et sûre des electrodes avec le dispositif de commande et cela sans recourir a des opérations de masquage des points de connexion lors du dépôt de la couche dielectrique et de la couche d'alignement sur les électrodes. Thus, a simple and secure connection of the electrodes is ensured with the control device, and this without resorting to operations for masking the connection points during the deposition of the dielectric layer and of the alignment layer on the electrodes.
En outre, la réalisation d'une telle connexion protege les électrodes de la corrosion. Furthermore, making such a connection protects the electrodes from corrosion.
Selon un mode avantageux de réalisation, la matière synthétique adhésive fait partie de la famille chimique des resines époxydes, et les particules conductrices sont des particules métalliques. According to an advantageous embodiment, the adhesive synthetic material is part of the chemical family of epoxy resins, and the conductive particles are metallic particles.
D'autres caracteristiques et avantages de l'invention apparaitront a la lecture de la description qui suit des modes de réalisation non limitatifs en liaison avec les dessins ci-joints parmi lesquels
- la figure 1 montre une vue en coupe d'un retroviseur pour vehicule automobile dans lequel est incorporée une cellule électrooptique perfectionnee selon l'invention,
- la figure 2 est une vue a grande échelle de la partie entourée par un trait mixte et désignée par la lettre A sur la figure 1,
- les figures 3 et 4 sont des vues partielles en coupe de deux variantes de réalisation de l'invention,
- la figure 5 est une vue en coupe de dessus d'une cellule electro-optique reliée a un support de circuit imprime selon l'invention, et
- la figure 6 et une vue en coupe selon la ligne VI-VI de la figure 5.Other characteristics and advantages of the invention will appear on reading the following description of nonlimiting embodiments in conjunction with the attached drawings, among which
FIG. 1 shows a sectional view of a rear-view mirror for a motor vehicle in which an improved electro-optical cell according to the invention is incorporated,
FIG. 2 is a large-scale view of the part surrounded by a dashed line and designated by the letter A in FIG. 1,
FIGS. 3 and 4 are partial sectional views of two alternative embodiments of the invention,
FIG. 5 is a top sectional view of an electro-optical cell connected to a printed circuit support according to the invention, and
- Figure 6 and a sectional view along line VI-VI of Figure 5.
En se référant tout d'abord a la figure 1, on voit un retroviseur pour véhicule automobile désigne par la référence générale 1 comprenant une cellule a cristal liquide perfectionnée 2 selon l'invention. A titre d'exemple, la cellule est de forme génerale rectangulaire. Referring first to Figure 1, we see a mirror for a motor vehicle designated by the general reference 1 comprising an improved liquid crystal cell 2 according to the invention. For example, the cell is generally rectangular.
La cellule 2 est montée dans un cadre 3, ce dernier étant fixe par collage dans le boitier 4 du retroviseur 1. The cell 2 is mounted in a frame 3, the latter being fixed by gluing in the housing 4 of the mirror 1.
Cette cellule 2 comprend, de maniere connue, une lame avant 5 transparente ayant subi un traitement anti-reflet et une lame arriere 6, les deux lames 5 et 6 étant reunies entre elles par un cadre de scellement 7 définissant un volume étanche dans lequel est emprisonné un melange 8 composé d'un cristal liquide nématique et d'un colorant dichrolque. This cell 2 comprises, in a known manner, a transparent front blade 5 having undergone an anti-reflection treatment and a rear blade 6, the two blades 5 and 6 being joined together by a sealing frame 7 defining a sealed volume in which is imprisoned a mixture 8 composed of a nematic liquid crystal and a dichrolic dye.
La lame 5 avant porte sur sa face interne, une électrode 9 transparente s'étendant sur la totalité de la lame, par exemple un mélange d'oxyde d'indium/étain, ainsi qu'une couche diélectrique et une couche d'alignement non représentées sur cette figure. The front blade 5 carries on its internal face, a transparent electrode 9 extending over the entire blade, for example a mixture of indium tin oxide, as well as a dielectric layer and a non-alignment layer. shown in this figure.
Par ailleurs, la lame arriere 6 porte sur la totalité de sa face interne une contre-electrode 10, une couche réfléchissante pouvant constituer ladite contre-électrode, et une couche diélectrique et une couche d'alignement egalement non représentées. Furthermore, the rear blade 6 carries over its entire internal face a counter-electrode 10, a reflective layer which may constitute said counter-electrode, and a dielectric layer and an alignment layer also not shown.
On voit également un boitier de commande électrique 13 qui comprend une entrée reliée a un capteur photo-sensible 14, ce boîtier délivrant un signal de commande représentatif de l'intensité de la lumière reçue par le capteur, vers deux sorties reliees respectivement a l'électrode 9 et la contre-electrode 10 afin de commander le degre d'absorption de la cellule 2. We also see an electrical control box 13 which includes an input connected to a photo-sensitive sensor 14, this box delivering a control signal representative of the intensity of the light received by the sensor, to two outputs connected respectively to the electrode 9 and the counter electrode 10 in order to control the degree of absorption of cell 2.
Enfin on voit, entoures par un cercle en trait interrompu désigne par la lettre A, des moyens de connexion 15. Selon l'invention, ces moyens de connexion 15 sont destinés a établir une liaison électrique respectivement entre chaque électrode 9, 10 et le dispositif de commande 13 et seront décrits plus en détail dans ce qui suit en référence aux figures 2 a 4. Finally, we see, surrounded by a circle in dashed lines denoted by the letter A, connection means 15. According to the invention, these connection means 15 are intended to establish an electrical connection respectively between each electrode 9, 10 and the device 13 and will be described in more detail below with reference to FIGS. 2 to 4.
En se referant a la figure 2, on voit une vue agrandie des moyens de connexion 15 représentés a la figure 1. Referring to FIG. 2, an enlarged view of the connection means 15 shown in FIG. 1 is seen.
Les electrodes 9, 10 recouvrent respectivement la totalité des lames 5, 6 et lesdites électrodes viennent affleurer la tranche 16 des lames pour y définir une zone de contact 17. Cette zone de contact 17 s'etend le long du pourtour de chaque lame 5, 6. The electrodes 9, 10 respectively cover all of the blades 5, 6 and said electrodes are flush with the edge 16 of the blades to define there a contact area 17. This contact area 17 extends along the periphery of each blade 5, 6.
Les electrodes 9, 10 sont totalement recouvertes par la couche dielectrique 18 et la couche d'alignement 19. Ces couches 18 et 19 s'étendent aussi a la surface des lames pour venir affleurer la tranche 16 si bien qu'un contact avec les electrodes 9, 10 ne peut pas être réalisée directement par la surface 20. The electrodes 9, 10 are completely covered by the dielectric layer 18 and the alignment layer 19. These layers 18 and 19 also extend on the surface of the blades to come flush with the wafer 16 so that contact with the electrodes 9, 10 cannot be produced directly by the surface 20.
Pour fixer les idees, on notera que l'épaisseur des électrodes et celles des deux autres couches susdites sont de l'ordre de quelques centaines d'Angströms. To fix the ideas, it will be noted that the thickness of the electrodes and those of the two other above-mentioned layers are of the order of a few hundred Angstroms.
Selon l'invention, les moyens de connexion 15 comprennent un plot de contact 21 associé a chaque électrode 9, 10. Ce plot de contact 21 est realisé en une matiere adhésive synthetique chargée de particules conductrices et est apportée sur la tranche 16 dans la zone de contact 17 de chacune des lames 5, 6. According to the invention, the connection means 15 comprise a contact pad 21 associated with each electrode 9, 10. This contact pad 21 is made of a synthetic adhesive material charged with conductive particles and is brought to the wafer 16 in the area contact 17 of each of the blades 5, 6.
Ce plot de contact 21 constitue par la matière adhésive susdite assure donc a la fois la liaison electrique et la liaison mécanique entre un autre elément de connexion relié au dispositif de commande, et la cellule. This contact pad 21 constitutes by the above-mentioned adhesive material therefore ensures both the electrical connection and the mechanical connection between another connection element connected to the control device, and the cell.
Dans ce cas, ledit autre élément reliant la cellule au dispositif de commande est un fil conducteur 22 dont une extremite est noyee dans la masse du plot 21. In this case, said other element connecting the cell to the control device is a conductive wire 22, one end of which is embedded in the mass of the stud 21.
Pratiquement, le plot 21 est constitue par une colle époxyde conductrice, cette dernière etant chargée de particules d'argent ou analogues. Ce type de colle peut être par exemple obtenu chez "PROTEX" sous la denomination commerciale "Protonic". In practice, the stud 21 is constituted by a conductive epoxy adhesive, the latter being charged with silver particles or the like. This type of glue can for example be obtained from "PROTEX" under the trade name "Protonic".
L'application de la colle peut se faire au pinceau ou par tout autre moyen approprié. Toutefois, il faut veiller a ce qu'elle soit apportee en quantité suffisante pour établir un contact intime avec l'électrode afin d'assurer un contact satisfaisant. The glue can be applied by brush or by any other appropriate means. However, care must be taken that it is provided in sufficient quantity to establish intimate contact with the electrode in order to ensure satisfactory contact.
Sur les figures 3 et 4, on voit deux variantes de réalisation d'une cellule perfectionnée selon l'invention, dans lesquelles on a designe les éléments identiques a ceux décrits précédemment par les mêmes références numériques. In FIGS. 3 and 4, two alternative embodiments of an improved cell according to the invention are seen, in which the elements identical to those described above have been designated by the same reference numerals.
Dans la variante de realisation représentée a la figure 3, apres avoir applique la colle conductrice dans la zone de contact 17, le plot de contact 21 forme par cette derniere est relie au dispositif de commande au moyen d'une pince 23 qui forme donc un autre élément des moyens de connexion selon l'invention. In the variant embodiment shown in FIG. 3, after having applied the conductive adhesive in the contact area 17, the contact pad 21 formed by the latter is connected to the control device by means of a clamp 23 which therefore forms a another element of the connection means according to the invention.
Cette pince 23 reliée au dispositif de commande 13 par un fil conducteur 22 est disposée pour venir serrer la lame 5 en meme temps qu'elle coiffe le plot 21 afin de réaliser le contact (lectrique. This clamp 23 connected to the control device 13 by a conductive wire 22 is arranged to clamp the blade 5 at the same time as it covers the stud 21 in order to make the contact (electrical.
Ainsi, la liaison electrique avec le dispositif de commande est realisée de façon sûre tout en renforçant la liaison mécanique entre la cellule et le fil conducteur.Thus, the electrical connection with the control device is made in a safe manner while strengthening the mechanical connection between the cell and the conductive wire.
Avantageusement,-le plot 21 remplit la totalité du fond de la pince 23, et la pince est mise en place avant le séchage de la colle. Advantageously, the pad 21 fills the entire bottom of the clamp 23, and the clamp is put in place before the glue dries.
En se referant maintenant a la variante de realisation représen- tée sur la figure 4, le plot de contact 21 constitue un substrat pour une soudure métallique 24 comprenant, noyee dans sa masse, l'extrémité d'un fil conducteur 22 relie au dispositif de commande. Referring now to the alternative embodiment shown in FIG. 4, the contact pad 21 constitutes a substrate for a metal weld 24 comprising, embedded in its mass, the end of a conductive wire 22 connected to the device for ordered.
Dans ce cas, le plot de contact 21 réalisé avec la colle conductrice s'étend dans la zone de contact 17 sur une surface suffisamment importante pour que la soudure métallique rapportee puisse réaliser un bon contact électrique en même temps qu'une bonne liaison mécanique avec le plot de contact 21. In this case, the contact pad 21 produced with the conductive adhesive extends in the contact area 17 over a sufficiently large area so that the added metal weld can make a good electrical contact at the same time as a good mechanical connection with the contact pad 21.
On notera que dans les exemples illustres et précédemment décrits, les lames 5, 6 de la cellule sont légèrement decalees l'une par rapport a l'autre. Dans tous ces cas, le decalage permet simplement de realiser une connexion de l'électrode portée par chacune des lames sans risquer d'etablir des courts-circuits entre elles. Note that in the examples illustrated and previously described, the blades 5, 6 of the cell are slightly offset relative to each other. In all these cases, the offset simply makes it possible to make a connection of the electrode carried by each of the blades without risking establishing short circuits between them.
Bien entendu, si l'on desire connecter une cellule selon l'invention sans ce décalage, il suffit de déposer l'électrode sur chacune des lames de sorte que sur au moins un bord lateral de la lame une des électrodes n'affleure pas la tranche de celle-ci. Of course, if it is desired to connect a cell according to the invention without this offset, it suffices to deposit the electrode on each of the blades so that on at least one lateral edge of the blade one of the electrodes does not lie flush with the slice of it.
L'invention est particulierement intéressante dans le cas de cellules comprenant par lame une seule electrode recouvrant la totalite de la surface de celle-ci, mais on remarquera que cette invention peut être aussi utilise avantageusement dans des cellules dans lesquelles chaque lame comprend une pluralité d'électrodes déposées selectivement selon une configuration déterminée, notamment dans des cellules classiques d'affichage a cristal liquide. The invention is particularly advantageous in the case of cells comprising a single electrode per blade covering the entire surface thereof, but it will be noted that this invention can also be advantageously used in cells in which each plate comprises a plurality of electrodes selectively deposited according to a determined configuration, in particular in conventional liquid crystal display cells.
En effet, dans un autre exemple de réalisation, représenté aux figures 5 et 6, on voit partiellement une cellule d'affichage a cristal liquide 2 comprenant sur chacune des lames 5 et 6, une pluralite d'electrodes 26a, 26b, deposees selectivement sur cellesci. Cette cellule 2 est reliee a un dispositif de commande (non representé) au moyen d'un support de circuit imprimé 27 portant une pluralité de pistes conductrices 28 associées chacune a une électrode 26a. Indeed, in another embodiment, shown in Figures 5 and 6, we partially see a liquid crystal display cell 2 comprising on each of the blades 5 and 6, a plurality of electrodes 26a, 26b, selectively deposited on these. This cell 2 is connected to a control device (not shown) by means of a printed circuit support 27 carrying a plurality of conductive tracks 28 each associated with an electrode 26a.
La connexion entre les pistes conductrices et les électrodes est assuree ici par un joint de colle conductrice anisotrope 29 disposé entre les pistes conductrices 28 portées par le support essentiellement dans la zone de contact 17 associée a chacune des électrodes 26a, situee sur la tranche 16 de la cellule. The connection between the conductive tracks and the electrodes is provided here by an anisotropic conductive adhesive gasket 29 disposed between the conductive tracks 28 carried by the support essentially in the contact area 17 associated with each of the electrodes 26a, located on the edge 16 of the cell.
Comme il ressort clairement de la figure 6, la ou les electrodes 26b portées par la lame 5 ne s'étendent pas jusqu'au bord de cette derniere. Cette configuration permet d'éviter un court-circuit entre les électrodes 26b et les électrodes 26a portées par la lame 6 lors de la connexion. As is clear from FIG. 6, the electrode (s) 26b carried by the blade 5 do not extend to the edge of the latter. This configuration avoids a short circuit between the electrodes 26b and the electrodes 26a carried by the blade 6 during connection.
En revanche, on notera que la couche diélectrique 18 et la couche d'alignement 19 n'ont pas éte deposees sélectivement et recouvrent la totalite de la surface de la lame 5 ainsi que de la lame 6. On évite ainsi des opérations de masquage qui auraient été nécessaires avec une connexion classique. On the other hand, it will be noted that the dielectric layer 18 and the alignment layer 19 have not been selectively deposited and cover the entire surface of the blade 5 as well as the blade 6. This thus avoids masking operations which would have been necessary with a conventional connection.
De plus, la connexion du support 27 et de la cellule 2 par la tranche 17 de celle-ci ne nécessite plus le décalage classique des lames et l'ensemble ainsi obtenu est rendu avantageusement compact. In addition, the connection of the support 27 and the cell 2 by the edge 17 thereof no longer requires the conventional offset of the blades and the assembly thus obtained is advantageously made compact.
Claims (8)
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8812639A FR2637110B1 (en) | 1988-09-26 | 1988-09-26 | IMPROVED ELECTRO-OPTICAL CELL |
| DE1989608988 DE68908988T2 (en) | 1988-09-16 | 1989-09-04 | Electro-optical cell. |
| EP19890116276 EP0359082B1 (en) | 1988-09-16 | 1989-09-04 | Electro-optical cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8812639A FR2637110B1 (en) | 1988-09-26 | 1988-09-26 | IMPROVED ELECTRO-OPTICAL CELL |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| FR2637110A1 true FR2637110A1 (en) | 1990-03-30 |
| FR2637110B1 FR2637110B1 (en) | 1993-05-07 |
Family
ID=9370462
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR8812639A Expired - Fee Related FR2637110B1 (en) | 1988-09-16 | 1988-09-26 | IMPROVED ELECTRO-OPTICAL CELL |
Country Status (1)
| Country | Link |
|---|---|
| FR (1) | FR2637110B1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0936496A1 (en) * | 1998-02-13 | 1999-08-18 | Asulab S.A. | Electrooptical cell or electrochemical photovoltaic cell and method of production thereof |
| WO1999041638A1 (en) * | 1998-02-11 | 1999-08-19 | Asulab S.A. | Electrooptical cell or photovoltaic cell, and method for making same |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3781087A (en) * | 1972-05-08 | 1973-12-25 | Suwa Seikosha Kk | Molding construction of plates of liquid crystal display |
| US3914021A (en) * | 1971-07-09 | 1975-10-21 | Suwa Seikosha Kk | Liquid crystal display device with improved contact means |
| FR2399704A1 (en) * | 1977-08-05 | 1979-03-02 | Siemens Ag | LIQUID CRYSTAL CELL WITH CONTACTED ELECTRODES, AND PROCESS FOR ITS MANUFACTURING |
| JPS59133A (en) * | 1982-06-25 | 1984-01-05 | Seiko Instr & Electronics Ltd | Liquid crystal display |
| GB2160693A (en) * | 1984-05-12 | 1985-12-24 | Citizen Watch Co Ltd | Liquid crystal display device |
| JPS61167925A (en) * | 1985-01-22 | 1986-07-29 | Matsushita Electric Ind Co Ltd | Liquid-crystal display device |
| EP0201938A2 (en) * | 1985-05-17 | 1986-11-20 | C-D Marketing, Ltd. | Liquid crystal controlled mirror systems |
-
1988
- 1988-09-26 FR FR8812639A patent/FR2637110B1/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3914021A (en) * | 1971-07-09 | 1975-10-21 | Suwa Seikosha Kk | Liquid crystal display device with improved contact means |
| US3781087A (en) * | 1972-05-08 | 1973-12-25 | Suwa Seikosha Kk | Molding construction of plates of liquid crystal display |
| FR2399704A1 (en) * | 1977-08-05 | 1979-03-02 | Siemens Ag | LIQUID CRYSTAL CELL WITH CONTACTED ELECTRODES, AND PROCESS FOR ITS MANUFACTURING |
| JPS59133A (en) * | 1982-06-25 | 1984-01-05 | Seiko Instr & Electronics Ltd | Liquid crystal display |
| GB2160693A (en) * | 1984-05-12 | 1985-12-24 | Citizen Watch Co Ltd | Liquid crystal display device |
| JPS61167925A (en) * | 1985-01-22 | 1986-07-29 | Matsushita Electric Ind Co Ltd | Liquid-crystal display device |
| EP0201938A2 (en) * | 1985-05-17 | 1986-11-20 | C-D Marketing, Ltd. | Liquid crystal controlled mirror systems |
Non-Patent Citations (3)
| Title |
|---|
| ELECTRONICS, vol. 47, no. 19, 19 septembre 1974, pages 122-125; L.S. BUCHOFF: "Conductive elastomers make small, flexible contacts" * |
| PATENT ABSTRACTS OF JAPAN, vol. 10, no. 374 (P-527)[2431], 12 décembre 1986; & JP-A-61 167 925 (MATSUSHITA ELECTRIC IND. CO., LTD) 29-07-1986 * |
| PATENT ABSTRACTS OF JAPAN, vol. 8, no. 82 (P-268)[1519], 14 avril 1984; & JP-A-59 133 (DAINI SEIKOSHA K.K.) 05-01-1984 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999041638A1 (en) * | 1998-02-11 | 1999-08-19 | Asulab S.A. | Electrooptical cell or photovoltaic cell, and method for making same |
| EP0936496A1 (en) * | 1998-02-13 | 1999-08-18 | Asulab S.A. | Electrooptical cell or electrochemical photovoltaic cell and method of production thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2637110B1 (en) | 1993-05-07 |
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