EP0078237A1 - Uhr mit analoger Anzeige, deren Zifferblatt aus einer Flüssigkeitskristallanzeigezelle besteht - Google Patents

Uhr mit analoger Anzeige, deren Zifferblatt aus einer Flüssigkeitskristallanzeigezelle besteht Download PDF

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Publication number
EP0078237A1
EP0078237A1 EP82810433A EP82810433A EP0078237A1 EP 0078237 A1 EP0078237 A1 EP 0078237A1 EP 82810433 A EP82810433 A EP 82810433A EP 82810433 A EP82810433 A EP 82810433A EP 0078237 A1 EP0078237 A1 EP 0078237A1
Authority
EP
European Patent Office
Prior art keywords
layer
liquid crystal
watch
cell
watch according
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
Application number
EP82810433A
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English (en)
French (fr)
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EP0078237B1 (de
Inventor
Eric Saurer
Fereydoun Gharadjedaghi
Yves Ruedin
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.)
Asulab AG
Original Assignee
Asulab AG
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 Asulab AG filed Critical Asulab AG
Publication of EP0078237A1 publication Critical patent/EP0078237A1/de
Application granted granted Critical
Publication of EP0078237B1 publication Critical patent/EP0078237B1/de
Expired legal-status Critical Current

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    • G—PHYSICS
    • G04—HOROLOGY
    • G04G—ELECTRONIC TIME-PIECES
    • G04G9/00—Visual time or date indication means
    • G04G9/0082—Visual time or date indication means by building-up characters using a combination of indicating elements and by selecting desired characters out of a number of characters or by selecting indicating elements the positions of which represents the time, i.e. combinations of G04G9/02 and G04G9/08
    • G04G9/0094—Visual time or date indication means by building-up characters using a combination of indicating elements and by selecting desired characters out of a number of characters or by selecting indicating elements the positions of which represents the time, i.e. combinations of G04G9/02 and G04G9/08 using light valves, e.g. liquid crystals

Definitions

  • the present invention relates to watches and, more particularly, a watch having an analog display device such as needles moving in front of a dial, and a liquid crystal display cell forming said dial.
  • This cell can be put, in response to an external action, in a first mode for which it displays information, for example digital time information, or in a second mode for which it does not display said information.
  • a liquid crystal cell comprises an assembly hereinafter called “composite layer”, formed of at least one layer, the opacity of which undergoes a modification in the zones where it is subjected to the action of an electric field.
  • Japanese watch application no. 52-14367 discloses a watch of the aforementioned type.
  • the liquid crystal display cell has, when it does not display any information, a uniformly clear surface.
  • this cell displays information, it is displayed in dark on a light background.
  • the surface forming the dial is formed by the light-reflector-diffuser located at the rear of the cell.
  • This known watch has the disadvantage of the unsightly effect due to the relatively large distance separating the hands from the surface forming the dial.
  • the object of the invention is to remedy this drawback.
  • the watch comprises a liquid crystal display cell whose composite layer is uniformly opaque when no electric field is applied to the liquid crystal layer.
  • the aesthetics of the watch is improved by virtue of the fact that the surface forming the dial, that is to say the surface furthest from the hands which reflects light capable of reaching the eye of the user, is located closer to the hands or other analog time display device, than the reflector-diffuser.
  • the watch cell is of the type comprising a layer of liquid crystal containing a nematic compound with positive dielectric anisotropy, and pleochroic molecules having a substantial light absorption coefficient in most lengths visible waves.
  • a polarizer is placed between said liquid crystal layer and the reflector-diffuser.
  • the drawings represent a watch whose case includes a middle part 1 and a watch glass 2.
  • This watch includes analog time display means comprising an hour hand 3 and a minute hand 4.
  • These hands 3, 4 are arranged above a liquid crystal display cell 5 which forms a dial for the hands 3 and 4, and which extends over the entire area of the window 6 covered by the watch glass 2, of the case.
  • the cell 5 has a bore 5a located substantially in its center; this bore is crossed by the axis 3a on which is fixed the hour hand 3, and by the axis 4a on which is fixed the minute hand 4.
  • the watch shown also comprises a control circuit represented diagrammatically by a rectangle bearing the reference 7 in FIGS. 2 and 3.
  • the circuit 7 responds to an actuation signal supplied by a device 8, by applying to the input terminals 5b of the display cell 5 a suitable control signal.
  • the actuating device 8 comprises means allowing the entry of information from outside the watch. These means are for example constituted by an operating member with crown 9 and by a pusher 10. Of course, the operating member with crown 9 and the pusher 10 can be replaced by any other device such as capacitive devices or photosensitive elements, allowing entry of information into the watch.
  • the latter applies a control signal to the terminals 5b of the cell 5 so that the latter displays particular information, chosen from several types of information. It can for example be time information such as the hour, minute and second, as shown in FIG. 1. It can also be date information, information of timed time, etc.
  • cell 5 displays a characteristic sign of the type of this information.
  • the cell 5 displays, in addition to an hour, minute and second information 11, arranged on the lower part of the surface of the cell 5, a stylized informative sign 12 indicating that this is hourly information.
  • a stylized informative sign 12 indicating that this is hourly information.
  • the circuit 7 comprises, as is well known, a generator of a time standard signal, such as a quartz oscillator, a divider, counters and a decoder receiving the counting information signals supplied by said counters .
  • the device 8 comprises, for example, switches interposed between said decoder and the input terminals 5b of the display cell 5. Said switches are for example controlled by the pusher 10 forming part of the actuating device 8.
  • Each pressing of the pusher 10 causes, for example, the closing of a contact connecting a voltage source to the input T of a rocker of type T whose output Q is connected to the MOS transistor control electrodes constituting the above-mentioned switches.
  • a first pressing of the push-button 10 causes the display by the cell 5 of information such as 11 and of a sign such as 12.
  • a second pressing of the push-button 10 makes this display disappear.
  • FIG. 2 shows an exemplary embodiment according to which the display cell 5 is of the type which is described in American patent no. 3,731,986. This type of cell is generally called "twisted nematic liquid crystal".
  • the cell 5 comprises a transparent front plate 13, a transparent rear plate 14, spacing and closing means 15 delimiting, in cooperation with the plates 13 and 14, a closed space situated between said plates.
  • a nematic liquid crystal layer with positive dielectric anisotropy 16 In this closed space there is a nematic liquid crystal layer with positive dielectric anisotropy 16.
  • the liquid crystal layer 16 has, in the absence of an electric field, a helical structure with an axis substantially orthogonal to this layer and having an angle total torsion of 90 °.
  • the cell 5 further comprises two polarizers 17 and 18 placed, respectively, on either side of the assembly formed by the plates 13 and 14 and the liquid crystal layer 16, the optical axes of the polarizers being parallel to each other.
  • the cell 5 finally comprises a wall 19, the face facing the assembly formed by the plates 13 and 14 and the polarizers 17 and 18 is reflecting and diffusing light.
  • the liquid crystal layer 16 and the polarizers 17 and 18 form a composite layer whose opacity can be modified under the effect of an electric field
  • the front plates 13 and rear 14 are provided with electrodes 20 respectively 21.
  • the axes of the polarizers 17 and 18 are parallel to each other.
  • the composite layer is uniformly opaque.
  • cell 5 appears uniformly dark over its entire extent.
  • the analog time display hands 3, 4 which are advantageously of a clear and brilliant color, stand out and are therefore easily visible on this dark background which constitutes cell 5.
  • the composite layer of this cell being opaque, the surface constituting the dial in front of which the hands 3 and 4 move is located at the front polarizer 17, therefore much closer to the hands than the reflecting surface of the reflector-diffuser 19.
  • cell 5 is also provided with means for permanently displaying a sign or information, for example a trademark, such as the mark represented schematically by the letters XYZ, 22 in FIG. 1 .
  • a trademark such as the mark represented schematically by the letters XYZ, 22 in FIG. 1 .
  • This permanent display can be obtained by a metal deposit 22a such as an aluminum layer deposited on one of the faces, for example on the internal face of the front plate 13.
  • trademark sign could be displayed by means of electrodes, by applying an electric field to the layer of liquid crystal.
  • a partially reflecting layer 23 is placed at the front of the plate 13.
  • the liquid crystal display cell 5 is of the type described in US Patent No. 3,551,026. This type of cell is generally designated by the name HEILMEIER of its inventor.
  • the cell of the watch shown in FIG. 3 differs from that of the watch shown in FIG. 2 in that it comprises a layer of liquid crystal 160 comprising, in addition to a nematic compound with positive dielectric anisotropy, a pleochroic dye, and that it has only one polarizer 180.
  • the liquid crystal layer 160 is disposed in a closed space delimited by a front plate 130, a rear plate 140, and spacing and closing means 150 hereinafter called spacer.
  • the pleochroic dye contained in the liquid crystal layer 160 advantageously has a relatively high absorption coefficient in most of the visible wavelengths, so that the cell is present at rest, that is to say in the absence electric field applied to said liquid crystal layer 160, a substantially black or slightly tinted color, depending on the proportions of pleochroic molecules constituting the dye.
  • This dye is for example that which is described in the patent application in FRG published under the number 30.28.593.
  • the internal faces that is to say the faces facing the liquid crystal layer 160, of the plates 130 and 140, comprise planar alignment layers capable of inducing an alignment of the nematic liquid crystal molecules and therefore of the pleochroic dye molecules, contained in layer 160, in a single direction, parallel to plates 130 and 140.
  • the optical axis of polarizer 180 is oriented parallel to said single direction. Thanks to these provisions, in the absence of an electric field applied to the liquid crystal layer 160, the cell 5 of FIG. 3 has a uniformly dark black appearance.
  • the circuit 7 applies to terminals 5b a control signal such that a potential difference is established between certain electrodes 20 and certain electrodes 21 of the plates 130 and 140.
  • the layer of liquid crystal 160 is subjected, at the locations located between said electrodes 20 and 21, to an electric field suppressing said planar alignment of the nematic liquid crystal and pleochroic dye molecules and replacing this alignment with a homeotropic alignment having the property of letting polarized light pass, whatever its frequency spectrum and whatever the orientation of its plane of polarization.
  • the information displayed by cell 5 in FIG. 3 is in clear on a dark background.
  • the composite layer formed by the liquid crystal layer 160 and the polarizer 180 is uniformly opaque over the entire extent of the cell 5.
  • this layer only becomes substantially transparent in these display areas, that is to say only in places where the liquid crystal layer 160 is subjected to an electric field.
  • the surface forming the dial in front of which the hands 3 and 4 move is clearly above the reflecting surface of the reflector-diffuser 19.
  • the distance separating the hands 3 and 4 from the surface forming the dial is thus relatively small, which appreciably improves the aesthetics of the watch.
  • the spacer 150 is advantageously made of a resin-based bonding material and containing a pigmentation agent having substantially the same color as the pleochroic dye contained in the layer of liquid crystal 160. In this way, the closure means 150 make integral part of the dial surface.
  • This resin can be an epoxy resin, a polyester, a phenolic resin, an acrylic resin, a polyurethane, or a derivative of these constituents.
  • the density of the pigmentation agent making it possible to obtain a suitable coloration of the material constituting the spacer is clearly lower than that of dye having the same effect.
  • the pigmentation agent used can be: carbon black, smoke black, a metal oxide, etc., mixed or not with pleochroic molecules.
  • the polarizer 180 can be placed at the front of the front plate 130 and not at the rear of the rear plate, as shown in FIG. 3.
  • cell 5 can be of the type described in American patent no. 3,833,287.
  • the liquid crystal layer 160 also contains a chiral compound inducing in said layer 160 a helical structure of pitch such that all the components of the light are absorbed.
  • the molecules of this layer are oriented, in these areas, perpendicular to the plates so that the light is no longer absorbed by the pleochroic molecules making these areas transparent.
  • the polarizer 180 becomes unnecessary and can therefore be omitted.
  • the effect obtained is all the better as the amount of light reflected by the elements inserted between the layer of liquid crystal and the needles is large compared to the amount of light which passes through the composite layer after being reflected by the reflector-diffuser, and taken globally over the entire width of the spectrum. This implies a judicious choice of the absorption characteristics of the reflector-diffuser, of the polarizers and / or of the pleochroic molecules.
  • polarizers and / or pleochroic molecules absorbing throughout the width of the visible spectrum and a white reflector-diffuser.
  • polarizers and / or dichroic molecules absorbing throughout the width of the visible spectrum are chosen, associated with a colored reflector-diffuser.
  • polarizers and / or dichroic molecules absorbing across the spectrum, with the exception of a few wavelengths and a colored reflector-diffuser.
  • Obtaining a tinted background is limited by the fact that the quantity of light passing through the composite layer is thus increased after being reflected by the reflector-diffuser. This limitation can be lifted thanks to the partially reflecting layer, which the front plate of the cell can carry.
  • This layer increases the amount of light reflected by the elements inserted between the liquid crystal layer and the needles, which also makes it possible to increase the amount of light which passes through the composite layer after being reflected by the reflector-diffuser, without for you might as well lose the desired effect.

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  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electric Clocks (AREA)
  • Electromechanical Clocks (AREA)
EP82810433A 1981-10-28 1982-10-19 Uhr mit analoger Anzeige, deren Zifferblatt aus einer Flüssigkeitskristallanzeigezelle besteht Expired EP0078237B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH687681A CH642227B (fr) 1981-10-28 1981-10-28 Montre a dispositif d'affichage analogique dont le cadran est forme par une cellule d'affichage a cristal liquide.
CH6876/81 1981-10-28

Publications (2)

Publication Number Publication Date
EP0078237A1 true EP0078237A1 (de) 1983-05-04
EP0078237B1 EP0078237B1 (de) 1987-01-07

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP82810433A Expired EP0078237B1 (de) 1981-10-28 1982-10-19 Uhr mit analoger Anzeige, deren Zifferblatt aus einer Flüssigkeitskristallanzeigezelle besteht

Country Status (6)

Country Link
US (1) US4488818A (de)
EP (1) EP0078237B1 (de)
JP (1) JPS5886478A (de)
CH (1) CH642227B (de)
DE (1) DE3275029D1 (de)
HK (1) HK12592A (de)

Cited By (8)

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FR2646269A1 (fr) * 1989-04-24 1990-10-26 Asulab Sa Cellule d'affichage electro-optique perfectionnee
US7291264B2 (en) 2000-05-08 2007-11-06 Honeywell International, Inc. Staged oil filter incorporating additive-releasing particles
EP2031469A1 (de) * 2007-08-29 2009-03-04 Creations Horlogeres de Lully SA Uhr mit modulierbarer Anzeige
US7755977B2 (en) 2005-10-28 2010-07-13 Montres Rado S.A. Display unit with decorative effects for a portable instrument, such as a watch
US7811462B2 (en) 2000-05-08 2010-10-12 Honeywell International, Inc. Additive dispersing filter and method of making
US7931817B2 (en) 2008-02-15 2011-04-26 Honeywell International Inc. Additive dispensing device and a thermally activated additive dispensing filter having the additive dispensing device
EP2731138A1 (de) * 2012-11-09 2014-05-14 EM Microelectronic-Marin SA Herstellungsverfahren eines OLED-Displays, so erzeugtes OLED-Display und ein solches Display umfassende Uhr
US9623350B2 (en) 2013-03-01 2017-04-18 Fram Group Ip Llc Extended-life oil management system and method of using same

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US4775964A (en) * 1988-01-11 1988-10-04 Timex Corporation Electroluminescent dial for an analog watch and process for making it
JP3064396B2 (ja) * 1990-11-08 2000-07-12 カシオ計算機株式会社 電子時計
US5202858A (en) * 1990-11-28 1993-04-13 Casio Computer Co., Ltd. Analog electronic timepiece having an electric-optical display device
JP3024215B2 (ja) * 1990-11-30 2000-03-21 カシオ計算機株式会社 電子時計
US5265071A (en) * 1993-02-02 1993-11-23 Timex Corporation Electroluminescent watch dial support and connector assembly
JPH07128458A (ja) * 1993-10-29 1995-05-19 Seiko Corp 時計用文字板構造
US5636185A (en) * 1995-03-10 1997-06-03 Boit Incorporated Dynamically changing liquid crystal display timekeeping apparatus
EA000018B1 (ru) * 1995-08-16 1997-12-30 Касио Компьютер Ко., Лтд. Электронный бытовой прибор
FR2743924B1 (fr) * 1996-01-23 1998-05-22 Asulab Sa Dispositif d'affichage d'un decor et piece d'horlogerie le comprenant
JPH10213687A (ja) * 1997-01-28 1998-08-11 Nec Shizuoka Ltd 情報表示選択装置及びこれを用いたデジタル装置
WO1999012073A1 (fr) * 1997-09-01 1999-03-11 Citizen Watch Co., Ltd. Dispositif electronique a unite d'affichage
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EP0926574A1 (de) * 1997-12-22 1999-06-30 Asulab S.A. Anzeigekombination mit zwei übereinander gestellten Anzeigevorrichtungen
JP4494628B2 (ja) * 1997-12-19 2010-06-30 アスラブ・エス アー 重ね合わせた２つのディスプレー装置を有するディスプレー・アセンブリ
EP0939331B1 (de) 1998-02-27 2010-04-14 Asulab S.A. Anzeigeeinheit mit zwei aufeinander liegenden Anzeigevorrichtungen
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JP2001134221A (ja) * 1999-09-13 2001-05-18 Asulab Sa ２つの重なり合った表示装置を含む表示アセンブリ
DE60042549D1 (de) * 2000-02-22 2009-08-27 Asulab Sa Eine zwei übereinander angeordnete Anzeigevorrichtungen umfassende Anzeigeeinheit mit Kontrastinversion
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US7347619B2 (en) * 2005-05-14 2008-03-25 Jong-Chan Lee Watch assembly having a dial integrally formed in the watch-glass
KR100770830B1 (ko) * 2006-05-10 2007-10-26 삼성전자주식회사 와치 타입 휴대 단말기
US7505370B2 (en) * 2006-05-23 2009-03-17 Sony Ericsson Mobile Communications Ab Clock display
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CH706065A1 (fr) * 2012-01-23 2013-07-31 Daniel Spadini Montre comportant un affichage analogique et un affichage numérique.
CH707479A1 (fr) * 2013-01-18 2014-07-31 Panerai Ag Off Pièce d'horlogerie comportant un affichage de réserve de marche par des organes polarisés présentant une orientation relative variable.
US20140293755A1 (en) * 2013-03-28 2014-10-02 Meta Watch Oy Device with functional display and method for time management
CN103472708A (zh) * 2013-09-18 2013-12-25 苏州朗昇通信科技有限公司 一种组合智能手表
EP2874024A1 (de) * 2013-11-15 2015-05-20 The Swatch Group Research and Development Ltd. Perlmuttzifferblatt für versteckte Anzeigevorrichtung
US9152129B2 (en) 2014-06-25 2015-10-06 Dilshan Thilina Modaragamage Electronic watch clasp systems and methods
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KR102465377B1 (ko) 2016-02-12 2022-11-10 삼성디스플레이 주식회사 표시 장치 및 이의 제조 방법
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JP6889064B2 (ja) * 2017-08-09 2021-06-18 株式会社ジャパンディスプレイ 表示装置
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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0394814A1 (de) * 1989-04-24 1990-10-31 Asulab S.A. Elektrooptische Anzeigezelle
FR2646269A1 (fr) * 1989-04-24 1990-10-26 Asulab Sa Cellule d'affichage electro-optique perfectionnee
US7291264B2 (en) 2000-05-08 2007-11-06 Honeywell International, Inc. Staged oil filter incorporating additive-releasing particles
US7811462B2 (en) 2000-05-08 2010-10-12 Honeywell International, Inc. Additive dispersing filter and method of making
US7755977B2 (en) 2005-10-28 2010-07-13 Montres Rado S.A. Display unit with decorative effects for a portable instrument, such as a watch
EP2031469A1 (de) * 2007-08-29 2009-03-04 Creations Horlogeres de Lully SA Uhr mit modulierbarer Anzeige
WO2009027490A1 (fr) * 2007-08-29 2009-03-05 Creations Horlogeres De Lully Sa Piece d'horlogerie a affichage modulable
EP2284630A1 (de) * 2007-08-29 2011-02-16 Creations Horlogeres de Lully SA Uhr mit modulierbarer Anzeige
US8134892B2 (en) 2007-08-29 2012-03-13 Creations Horlogeres De Lully Sa Timepiece with modular display
US7931817B2 (en) 2008-02-15 2011-04-26 Honeywell International Inc. Additive dispensing device and a thermally activated additive dispensing filter having the additive dispensing device
EP2731138A1 (de) * 2012-11-09 2014-05-14 EM Microelectronic-Marin SA Herstellungsverfahren eines OLED-Displays, so erzeugtes OLED-Display und ein solches Display umfassende Uhr
US9105871B2 (en) 2012-11-09 2015-08-11 Em Microelectronic-Marin S.A. Method of manufacturing an OLED display device, the resulting OLED display device and a timepiece comprising the same
US9623350B2 (en) 2013-03-01 2017-04-18 Fram Group Ip Llc Extended-life oil management system and method of using same

Also Published As

Publication number Publication date
CH642227GA3 (de) 1984-04-13
EP0078237B1 (de) 1987-01-07
JPH0210397B2 (de) 1990-03-07
DE3275029D1 (en) 1987-02-12
US4488818A (en) 1984-12-18
JPS5886478A (ja) 1983-05-24
CH642227B (fr)
HK12592A (en) 1992-02-21

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