WO2004017127A1 - Mirror with a display device - Google Patents

Mirror with a display device Download PDF

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Publication number
WO2004017127A1
WO2004017127A1 PCT/DE2003/002032 DE0302032W WO2004017127A1 WO 2004017127 A1 WO2004017127 A1 WO 2004017127A1 DE 0302032 W DE0302032 W DE 0302032W WO 2004017127 A1 WO2004017127 A1 WO 2004017127A1
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WO
WIPO (PCT)
Prior art keywords
mirror
liquid crystal
crystal cell
mirror according
light
Prior art date
Application number
PCT/DE2003/002032
Other languages
German (de)
French (fr)
Inventor
Thomas Brohm
Original Assignee
Siemens Aktiengesellschaft
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 Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO2004017127A1 publication Critical patent/WO2004017127A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R1/00—Optical viewing arrangements; Real-time viewing arrangements for drivers or passengers using optical image capturing systems, e.g. cameras or video systems specially adapted for use in or on vehicles
    • B60R1/02—Rear-view mirror arrangements
    • B60R1/08—Rear-view mirror arrangements involving special optical features, e.g. avoiding blind spots, e.g. convex mirrors; Side-by-side associations of rear-view and other mirrors
    • B60R1/083—Anti-glare mirrors, e.g. "day-night" mirrors
    • B60R1/084—Anti-glare mirrors, e.g. "day-night" mirrors using a removable filtering or hiding screen
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R1/00—Optical viewing arrangements; Real-time viewing arrangements for drivers or passengers using optical image capturing systems, e.g. cameras or video systems specially adapted for use in or on vehicles
    • B60R1/12—Mirror assemblies combined with other articles, e.g. clocks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R1/00—Optical viewing arrangements; Real-time viewing arrangements for drivers or passengers using optical image capturing systems, e.g. cameras or video systems specially adapted for use in or on vehicles
    • B60R1/12—Mirror assemblies combined with other articles, e.g. clocks
    • B60R2001/1215—Mirror assemblies combined with other articles, e.g. clocks with information displays
    • 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
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133528—Polarisers
    • G02F1/133536—Reflective polarizers

Definitions

  • the invention relates to a mirror with a display device.
  • a display device in a mirror is particularly advantageous in a number of applications.
  • an additional housing for a display device can be saved, for example, or the user of the mirror can simultaneously perceive the information displayed each time he looks in the mirror.
  • This advantage is particularly given in a motor vehicle if the display is integrated in the interior rearview mirror, which is frequently used while driving.
  • US 2002/0003439 AI describes a rearview mirror with a display integrated in its housing.
  • the object of the invention is therefore to propose a mirror with an integrated display that can be implemented in a flat design and is also constructed as simply as possible.
  • the display should also be realizable as a dot matrix.
  • a liquid crystal cell is provided on the side facing away from the viewer (rear side) with a polarizing converting film which passes polarized light from the rear side and reflects incoming light from the side facing the viewer (front side), and that a polarization filter is arranged on the front of the liquid crystal cell, the transmission polarization direction of which is parallel to the transmission polarization direction of the polarizing converting film.
  • Suitable polarizing converting foils for which the term polarization conversion film is also used in English, are available on the market and are marketed, for example, by 3M under the name Dual Brightness and Enhancement Film. Details of such a film are also described, for example, in WO 00/75560 AI.
  • the mirror according to the invention has the advantage, among other things, that all technologies known for producing LCD displays are available, that is to say the display can also be designed in the form of a dot matrix. This shows in particular the advantage of a low light intensity of the backlight. If one were to place an LCD display behind a partially transparent mirror, this would result, for example, in a combination of a partially transparent mirror with 20% transmission and the LCD display of 10%. Transmission. In total, 98% of the luminous flux supplied by the backlight is destroyed in such an arrangement.
  • the mirror according to the invention can in itself be combined with an existing lighting device, but it is preferably provided that an lighting device extends over at least part of the rear side.
  • an lighting device extends over at least part of the rear side.
  • the mirror according to the invention can preferably be used as a rear-view mirror in a vehicle.
  • the advantages according to the invention also apply to mirrors for other applications.
  • An advantageous embodiment of the invention consists in that a further polarization filter is arranged between the directionally selective reflecting device and the liquid crystal cell. This configuration also contributes to improving the mirror effect, in particular if the film has a low efficiency with regard to polarization.
  • a possibility for stopping down can be provided in a simple manner, namely in that a surface area of the liquid crystal cell that is not used for display is designed as a segment that can be actuated over a large area. There is preferably a light-absorbing layer behind the segment. The degree of reflection of the mirror can be set via the control voltage of this segment. In this case, automatic dimming can take place in that the segment which can be actuated over a large area is activated with the aid of a photo sensor.
  • the invention permits numerous embodiments. One of these is shown schematically in the drawing using several figures and described below. It shows:
  • Fig. 1 shows a cross section through an embodiment
  • Fig. 2 is a view of an embodiment.
  • FIG. 1 the thickness of the individual layers is greatly increased compared to the other dimensions for the sake of clarity.
  • electrical lines and electrodes as well as spacers in the liquid crystal cells were omitted.
  • Fig. 1 two transparent plates 1, 2 and the liquid crystal in between are shown of the liquid crystal cell.
  • Non-activated segments 3, 4, 5 of the liquid crystal lying between the plates 1, 2 are hatched and activated segments 6, 7 are shown without hatching.
  • a polarization filter 8 is arranged in the direction of an observer (indicated by a symbolized eye). Contrary to this, a polarizing converting film 9 is applied to the liquid crystal cell. To the rear, the mirror is sealed light-tight by a housing 10. A flat lighting device 11, for example an electro-luminescence plate or a light guide with LED lighting, is located within part of the housing. Thus, the entire surface of the mirror according to the invention is divided into a preferably larger surface 12 serving only as a mirror and a preferably smaller partial surface 13 for display. When the liquid crystal cell is inactive, the portion of the light incident from the viewer side that is polarized in the transmission direction of the polarization filter 8 is largely completely reflected by the film 9 and without changing the polarization direction.
  • the liquid crystal cell is designed such that when the light passes through the inactive cell, the direction of polarization is rotated by 90 °.
  • the portion that is polarized in the direction of transmission of the film 9 is let through by the light incident through the rear side and is rotated by 90 ° in the inactive segment and then absorbed by the front polarization filter 8.
  • the polarization direction of the light transmitted by the film 9 is not rotated, so that the polarization filter 8 transmits light and the segments 6, 7 appear bright.
  • FIG. 2 This is shown in FIG. 2 using a few characters composed of a few segments. Depending on the requirements, finer structures can also be mapped. If no displays are to take place, the lighting device 11 can be switched off so that the area 13 can be used as a mirror without disruptive influences.
  • the mirror can be darkened by applying a voltage, for example in order to prevent glare from following vehicles in a motor vehicle.
  • a voltage for example in order to prevent glare from following vehicles in a motor vehicle.
  • the mirror can also be darkened automatically in that a photodetector 14 controls a voltage to be supplied to the segment 3 via a control device 15.
  • a further control device 16 controls the individual segments 6, 7 of the display depending on the information to be displayed and the lighting device 11.

Abstract

A mirror with a display device, comprising a liquid crystal cell (1-7) on which a polarizing converting film (9) is provided on the side thereof (rear side) facing away from the observer, enabling incident light to be admitted from the rear side in a polarized manner and which reflects incident light from the side facing the observer, i.e. the front side. A polarization filter (8) is disposed on the front side of the liquid crystal cell (1-7), the path polarization direction thereof being parallel to the path-polarization direction of the polarizing converting film (9).

Description

Beschreibungdescription
Spiegel mit einer AnzeigevorrichtungMirror with a display device
Die Erfindung betrifft einen Spiegel mit einer Anzeigevorrichtung.The invention relates to a mirror with a display device.
Die Integration einer Anzeigevorrichtung (Display) in einem Spiegel ist bei einer Reihe von Anwendungen besonders vorteilhaft. Je nach Voraussetzungen im Einzelnen kann beispielsweise ein zusätzliches Gehäuse für eine Anzeigevorrichtung eingespart werden oder der Benutzer des Spiegels kann bei jedem Blick in den Spiegel gleichzeitig die angezeigten Informationen wahrnehmen. Dieser Vorteil ist insbesondere in einem Kraftfahrzeug gegeben, wenn das Display in den Innen- Rückspiegel integriert ist, der während der Fahrt häufig benutzt wird. US 2002/0003439 AI beschreibt einen Rückspiegel mit einem in dessen Gehäuse integrierten Display.The integration of a display device (display) in a mirror is particularly advantageous in a number of applications. Depending on the individual requirements, an additional housing for a display device can be saved, for example, or the user of the mirror can simultaneously perceive the information displayed each time he looks in the mirror. This advantage is particularly given in a motor vehicle if the display is integrated in the interior rearview mirror, which is frequently used while driving. US 2002/0003439 AI describes a rearview mirror with a display integrated in its housing.
Aus Auto & Elektronik 1/2000, Seiten 101 und 102 ist es bekannt, einen teildurchlässigen Spiegel zu verwenden, hinter dem eine geeignete LED-Anzeigevorrichtung angeordnet ist . Der teildurchlässige Spiegel ist ferner mit einer elektro-chromen Schicht zur einstellbaren Abbiendung versehen.From Auto & Elektronik 1/2000, pages 101 and 102 it is known to use a partially transparent mirror, behind which a suitable LED display device is arranged. The partially transparent mirror is also provided with an electro-chrome layer for adjustable bending.
Diese bekannten Spiegel weisen den Nachteil auf, dass die hinter dem Spiegel angeordnete Anzeige sehr lichtstark sein muss, um die geringe Transmission des teildurchlässigen Spiegels, der gegebenenfalls noch mit einem Farbfilter und einem elektro-chromen Filter versehen ist, zu kompensieren. Durch den damit erforderlichen Einsatz lichtstarker LED-Displays oder LEDs wird die Anzeigegestaltung, insbesondere die Farbwahl und die Darstellung «der Information im Einzelnen, stark eingeschränkt . Außerdem führt diese hohe Lichtstärke zu einer erhöhten Leistungsaufnahme. Weiterhin ist nachteilig, dass relativ viel Bauraum für die LED-Anzeige benötigt wird, so dass flache Spiegel - beispielsweise in der Sonnenblende - nicht ohne weiteres zu realisieren sind. Außerdem führt der relativ aufwendige Aufbau zu erhöhten Kosten.These known mirrors have the disadvantage that the display arranged behind the mirror has to be very bright in order to compensate for the low transmission of the partially transparent mirror, which is optionally also provided with a color filter and an electro-chrome filter. The required use of bright LED displays or LEDs severely limits the display design, in particular the choice of color and the presentation of the information. In addition, this high light intensity leads to increased power consumption. Another disadvantage is that a relatively large amount of space is required for the LED display, so that flat mirrors - for example in the sun visor - cannot be easily realized. In addition, the relatively complex structure leads to increased costs.
Aufgabe der Erfindung ist es daher, einen Spiegel mit einem integrierten Display vorzuschlagen, das in flacher Bauweise realisiert werden kann und ferner möglichst einfach aufgebaut ist. Darüber hinaus soll das Display auch als Punkt-Matrix realisierbar sein.The object of the invention is therefore to propose a mirror with an integrated display that can be implemented in a flat design and is also constructed as simply as possible. In addition, the display should also be realizable as a dot matrix.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, dass eine Flüssigkristallzelle auf der dem Betrachter abgewandten Seite (Rückseite) mit einer polarisierenden konvertierenden Folie versehen ist, die von der Rückseite eintreffendes Licht polarisiert durchläset und von der dem Betrachter zugewandten Seite (Vorderseite) eintreffendes Licht reflektiert, und dass auf der Vorderseite der Flüssigkristallzelle ein Polarisationsfilter angeordnet ist, dessen Durchlass-Polarisationsrich- tung parallel zur Durchlass-Polarisationsrichtung der polarisierenden konvertierenden Folie ist.This object is achieved according to the invention in that a liquid crystal cell is provided on the side facing away from the viewer (rear side) with a polarizing converting film which passes polarized light from the rear side and reflects incoming light from the side facing the viewer (front side), and that a polarization filter is arranged on the front of the liquid crystal cell, the transmission polarization direction of which is parallel to the transmission polarization direction of the polarizing converting film.
Geeignete polarisierende konvertierende Folien, für die im Englischen auch der Ausdruck polarization conversion film verwendet wird, stehen auf dem Markt zur Verfügung und werden beispielsweise von der Firma 3M unter der Bezeichnung Dual Brightness and Enhancement Film vertrieben. Einzelheiten einer solchen Folie sind beispielsweise auch in WO 00/75560 AI beschrieben.Suitable polarizing converting foils, for which the term polarization conversion film is also used in English, are available on the market and are marketed, for example, by 3M under the name Dual Brightness and Enhancement Film. Details of such a film are also described, for example, in WO 00/75560 AI.
Der erfindungsgemäße Spiegel hat unter anderem den Vorteil, dass alle zur Herstellung von LCD-Displays bekannten Technologien zur Verfügung stehen, das Display also auch in Form einer Punkt-Matrix ausgeführt werden kann. Hierbei zeigt sich insbesondere der Vorteil einer niedrigen Lichtstärke der Hintergrundbeleuchtung. Würde man nämlich ein LCD-Display hinter einem teildurchlässigen Spiegel anordnen, ergäbe sich beispielsweise eine Kombination aus einem teildurchlässigen Spiegel mit 20% Transmission und dem LCD-Display von 10% Transmission. Insgesamt wird bei einer derartigen Anordnung 98% des von der Hintergrundbeleuchtung gelieferten Lichtstromes vernichtet .The mirror according to the invention has the advantage, among other things, that all technologies known for producing LCD displays are available, that is to say the display can also be designed in the form of a dot matrix. This shows in particular the advantage of a low light intensity of the backlight. If one were to place an LCD display behind a partially transparent mirror, this would result, for example, in a combination of a partially transparent mirror with 20% transmission and the LCD display of 10%. Transmission. In total, 98% of the luminous flux supplied by the backlight is destroyed in such an arrangement.
Der erfindungsgemäße Spiegel kann an sich mit einer bestehenden Beleuchtungseinrichtung kombiniert werden, vorzugsweise ist jedoch vorgesehen, dass sich eine Beleuchtungseinrichtung über mindestens einen Teil der Rückseite erstreckt. Zur Verbesserung der Spiegeleigenschaften, die durch einen Rest- lichtstrom in Rückwärtsrichtung beeinträchtigt werden können, kann vorgesehen sein, dass die Rückseite gegen Außenlicht abgeschirmt ist.The mirror according to the invention can in itself be combined with an existing lighting device, but it is preferably provided that an lighting device extends over at least part of the rear side. To improve the mirror properties, which can be impaired by a residual luminous flux in the backward direction, it can be provided that the rear side is shielded from outside light.
Vorzugsweise kann der erfindungsgemäße Spiegel als Rückspiegel in einem Fahrzeug angewendet werden. Die erfindungsgemäßen Vorteile kommen jedoch auch bei Spiegeln für andere Anwendungen zur Geltung.The mirror according to the invention can preferably be used as a rear-view mirror in a vehicle. However, the advantages according to the invention also apply to mirrors for other applications.
Eine vorteilhafte Ausgestaltung der Erfindung besteht darin, dass zwischen der richtungsselektiv reflektierenden Einrichtung und der Flüssigkristallzelle ein weiteres Polarisationsfilter angeordnet ist. Diese Ausgestaltung trägt ebenfalls zur Verbesserung der Spiegelwirkung bei insbesondere, wenn die Folie bezüglich der Polarisierung eine geringe Effizienz aufweist .An advantageous embodiment of the invention consists in that a further polarization filter is arranged between the directionally selective reflecting device and the liquid crystal cell. This configuration also contributes to improving the mirror effect, in particular if the film has a low efficiency with regard to polarization.
Auch bei dem erfindungsgemäßen Spiegel kann eine Möglichkeit zum Abblenden in einfacher Weise vorgesehen sein, nämlich dadurch, dass ein nicht zur Anzeige dienender Flächenbereich der Flüssigkristallzelle als großflächig ansteuerbares Segment ausgebildet ist. Hinter dem Segment ist vorzugsweise eine lichtabsorbierende Schicht. Über die Ansteuerspannung dieses Segments kann der Reflektionsgrad des Spiegels eingestellt werden. Dabei kann ein automatisches Abblenden dadurch erfolgen, dass die Ansteuerung des großflächig ansteuerbaren Segments mit Hilfe eines Photosensors erfolgt. Die Erfindung lässt zahlreiche Ausführungsformen zu. Eine davon ist schematisch in der Zeichnung anhand mehrerer Figuren dargestellt und nachfolgend beschrieben. Es zeigt:In the case of the mirror according to the invention, too, a possibility for stopping down can be provided in a simple manner, namely in that a surface area of the liquid crystal cell that is not used for display is designed as a segment that can be actuated over a large area. There is preferably a light-absorbing layer behind the segment. The degree of reflection of the mirror can be set via the control voltage of this segment. In this case, automatic dimming can take place in that the segment which can be actuated over a large area is activated with the aid of a photo sensor. The invention permits numerous embodiments. One of these is shown schematically in the drawing using several figures and described below. It shows:
Fig. 1 einen Querschnitt durch ein Ausführungsbeispiel undFig. 1 shows a cross section through an embodiment and
Fig. 2 eine Ansicht eines Ausführungsbeispiels.Fig. 2 is a view of an embodiment.
Gleiche Teile sind in den Figuren mit gleichen Bezugszeichen versehen. Die Darstellungen sind stark schematisiert. So ist beispielsweise in Fig. 1 die Dicke der einzelnen Schichten der Übersichtlichkeit halber stark gegenüber den übrigen Abmessungen vergrößert. Außerdem wurden elektrische Leitungen und Elektroden sowie Abstandshalter in den Flüssigkristall- zellen fortgelassen.Identical parts are provided with the same reference symbols in the figures. The representations are highly schematic. For example, in FIG. 1 the thickness of the individual layers is greatly increased compared to the other dimensions for the sake of clarity. In addition, electrical lines and electrodes as well as spacers in the liquid crystal cells were omitted.
In Fig. 1 sind von der Flussigkristallzelle zwei transparente Platten 1, 2 und der dazwischenliegende Flüssigkristall dargestellt. Von dem zwischen den Platten 1, 2 liegenden Flüssigkristall sind nicht aktivierte Segmente 3, 4, 5 schraffiert und aktivierte Segmente 6, 7 ohne Schraffur dargestellt .In Fig. 1, two transparent plates 1, 2 and the liquid crystal in between are shown of the liquid crystal cell. Non-activated segments 3, 4, 5 of the liquid crystal lying between the plates 1, 2 are hatched and activated segments 6, 7 are shown without hatching.
In Richtung auf einen Betrachter (durch ein symbolisiertes Auge angedeutet) ist ein Polarisationsfilter 8 angeordnet. Entgegengesetzt dazu ist eine polarisierende konvertierende Folie 9 auf die Flussigkristallzelle aufgebracht. Nach hinten ist der Spiegel lichtdicht durch ein Gehäuse 10 abgeschlossen. Innerhalb eines Teils des Gehäuses befindet sich eine flächige Beleuchtungseinrichtung 11, beispielsweise eine Elektro-Lumineszenz-Platte oder ein Lichtleiter mit LED- Beleuchtung. Somit ist die gesamte Fläche des erfindungsgemäßen Spiegels in eine vorzugsweise größere lediglich als Spiegel dienende Fläche 12 und in eine vorzugsweise kleinere Teilfläche 13 für eine Anzeige aufgeteilt. Bei inaktiver Flussigkristallzelle wird der in Durchlassrichtung des Polarisationsfilters 8 polarisierte Anteil des von der Betrachterseite einfallenden Lichtes von der Folie 9 weitgehend vollständig und ohne Änderung der Polarisationsrichtung reflektiert. Bei dem Ausführungsbeispiel ist die Flussigkristallzelle derart ausgebildet, dass bei einem Durchgang des Lichts durch die inaktive Zelle die Polarisationsrichtung um 90° gedreht wird. Von dem durch die Rückseite einfallenden Licht wird der Anteil, der in Durchlassrichtung der Folie 9 polarisiert ist, durchgelassen und im inaktiven Segment in der Polarisation um 90° gedreht und dann durch das vordere Polarisationsfilter 8 absorbiert.A polarization filter 8 is arranged in the direction of an observer (indicated by a symbolized eye). Contrary to this, a polarizing converting film 9 is applied to the liquid crystal cell. To the rear, the mirror is sealed light-tight by a housing 10. A flat lighting device 11, for example an electro-luminescence plate or a light guide with LED lighting, is located within part of the housing. Thus, the entire surface of the mirror according to the invention is divided into a preferably larger surface 12 serving only as a mirror and a preferably smaller partial surface 13 for display. When the liquid crystal cell is inactive, the portion of the light incident from the viewer side that is polarized in the transmission direction of the polarization filter 8 is largely completely reflected by the film 9 and without changing the polarization direction. In the exemplary embodiment, the liquid crystal cell is designed such that when the light passes through the inactive cell, the direction of polarization is rotated by 90 °. The portion that is polarized in the direction of transmission of the film 9 is let through by the light incident through the rear side and is rotated by 90 ° in the inactive segment and then absorbed by the front polarization filter 8.
Werden die Segmente 6, 7 durch Anlegen einer Spannung aktiviert, wird die Polarisationsrichtung des von der Folie 9 transmittierten Lichts nicht gedreht, so dass das Polarisationsfilter 8 Licht durchlässt und die Segmente 6, 7 hell erscheinen.If the segments 6, 7 are activated by applying a voltage, the polarization direction of the light transmitted by the film 9 is not rotated, so that the polarization filter 8 transmits light and the segments 6, 7 appear bright.
In Fig. 2 ist dies anhand einiger aus wenigen Segmenten zusammengesetzten Schriftzeichen dargestellt. Je nach Anforderungen können auch feinere Strukturen abgebildet werden. Wenn keine Anzeigen erfolgen sollen, kann die Beleuchtungs- einrichtung 11 abgeschaltet werden, damit der Bereich 13 ohne störende Einflüsse als Spiegel benutzt werden kann.This is shown in FIG. 2 using a few characters composed of a few segments. Depending on the requirements, finer structures can also be mapped. If no displays are to take place, the lighting device 11 can be switched off so that the area 13 can be used as a mirror without disruptive influences.
Wird der Flächenbereich 12 der Flussigkristallzelle 1, 2 ebenfalls mit Elektroden versehen, so kann durch Anlegen einer Spannung der Spiegel abgedunkelt werden, um beispielsweise in einem Kraftfahrzeug Blendung durch nachfolgende Fahrzeuge zu verhindern. Dazu ist vorzugsweise hinter dem Flächenbereich 12 eine lichtabsorbierende Schicht 17 vorhanden, die eine diffuse Rückstreuung von der Gehäuse-Innenseite unterdrückt. Die Abdunklung des Spiegels kann auch automatisch dadurch geschehen, dass ein Photodetektor 14 über eine Steuereinrichtung 15 eine dem Segment 3 zuzuführende Spannung steuert. Eine weitere Steuereinrichtung 16 steuert die ein- zelnen Segmente 6, 7 des Displays in Abhängigkeit von der anzuzeigenden Information und die Beleuchtungseinrichtung 11. If the surface area 12 of the liquid crystal cell 1, 2 is also provided with electrodes, the mirror can be darkened by applying a voltage, for example in order to prevent glare from following vehicles in a motor vehicle. For this purpose, there is preferably a light-absorbing layer 17 behind the surface area 12, which suppresses diffuse backscattering from the inside of the housing. The mirror can also be darkened automatically in that a photodetector 14 controls a voltage to be supplied to the segment 3 via a control device 15. A further control device 16 controls the individual segments 6, 7 of the display depending on the information to be displayed and the lighting device 11.

Claims

Patentansprüche claims
1. Spiegel mit einer Anzeigevorrichtung, dadurch gekennzeichnet, dass eine Flussigkristallzelle (1 bis 7) auf der dem Betrachter abgewandten Seite (Rückseite) mit einer polarisierenden konvertierenden Folie (9) versehen ist, die von der Rückseite eintreffendes Licht polarisiert durchläset und von der dem Betrachter zugewandten Seite (Vorderseite) eintreffendes Licht reflektiert, und dass auf der Vorderseite der Flussigkristallzelle (1 bis 7) ein Polarisationsfilter (8) angeordnet ist, dessen Durchlass- Polarisationsrichtung parallel zur Durchläse- Polarisationsrichtung der polarisierenden konvertierenden Folie (9) ist.1. Mirror with a display device, characterized in that a liquid crystal cell (1 to 7) on the side facing away from the viewer (back) is provided with a polarizing converting film (9) which passes polarized light from the back and from which the light Reflecting incoming light on the side facing the observer, and that a polarization filter (8) is arranged on the front side of the liquid crystal cell (1 to 7), the transmission polarization direction of which is parallel to the transmission polarization direction of the polarizing converting film (9).
2. Spiegel nach Anspruch 1, dadurch gekennzeichnet, dass sich eine Beleuchtungseinrichtung (11) über mindestens einen Teil (13) der Rückseite erstreckt.2. Mirror according to claim 1, characterized in that an illumination device (11) extends over at least a part (13) of the back.
3. Spiegel nach Anspruch 2, dadurch gekennzeichnet, dass die Rückseite gegen Außenlicht abgeschirmt ist.3. Mirror according to claim 2, characterized in that the back is shielded from outside light.
4. Spiegel nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass zwischen der richtungsselektiv reflektierenden Einrichtung (9) und der Flussigkristallzelle (1 bis 7) ein weiteres Polarisationsfilter angeordnet ist.4. Mirror according to one of the preceding claims, characterized in that a further polarization filter is arranged between the directionally selective reflecting device (9) and the liquid crystal cell (1 to 7).
5. Spiegel nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass ein nicht zur Anzeige dienender Flächenbereich (12) der Flussigkristallzelle (1 bis 7) als großflächig ansteuerbares Segment (3) ausgebildet ist.5. Mirror according to one of the preceding claims, characterized in that a non-display area (12) of the liquid crystal cell (1 to 7) is designed as a large-area controllable segment (3).
6. Spiegel nach 7Λnspruch 5, dadurch gekennzeichnet, dass die Ansteuerung des großflächig ansteuerbaren Segments (3) mit Hilfe eines Photosensors (14) erfolgt. Spiegel nach einem der Ansprüche 5 oder 6, dadurch gekennzeichnet, dass hinter der richtungsselektiv reflektierenden Einrichtung (9) in dem nicht zur Anzeige dienenden Bereich eine lichtabsorbierende Schicht (17) angeordnet ist. 6. Mirror according to claim 7, characterized in that the actuation of the segment (3) which can be actuated over a large area takes place with the aid of a photosensor (14). Mirror according to one of Claims 5 or 6, characterized in that a light-absorbing layer (17) is arranged behind the directionally selectively reflecting device (9) in the region which is not used for display.
PCT/DE2003/002032 2002-07-24 2003-06-18 Mirror with a display device WO2004017127A1 (en)

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Application Number Priority Date Filing Date Title
DE2002133734 DE10233734A1 (en) 2002-07-24 2002-07-24 Mirror with display device especially for motor vehicles has a liquid crystal cell with rear polarized foil and a front polarizing filter
DE10233734.9 2002-07-24

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Cited By (1)

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WO2021000824A1 (en) * 2019-07-01 2021-01-07 深圳秋田微电子股份有限公司 Anti-dazzling rear view mirror and automobile

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Publication number Priority date Publication date Assignee Title
ATE440007T1 (en) * 2004-10-26 2009-09-15 Volkswagen Ag REAR-VIEW MIRROR FOR A MOTOR VEHICLE
US20070146481A1 (en) * 2005-12-12 2007-06-28 Volkswagen Ag Rear view mirror for a motor vehicle

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GB2002163A (en) * 1977-08-04 1979-02-14 Siemens Ag Methods of displaying data to drivers in vehicles or vessels
WO2001031371A1 (en) * 1999-10-25 2001-05-03 3M Innovative Properties Company Polarizer constructions and display devices exhibiting unique color effects
US20020036955A1 (en) * 1998-02-27 2002-03-28 Naci Basturk Display assembly including two superposed display devices
WO2002029484A2 (en) * 2000-09-29 2002-04-11 Innovative Technology Licensing, Llc High brightness transflective lcd and method using tunable mirror
DE10052751A1 (en) * 2000-10-25 2002-05-08 Mannesmann Vdo Ag Rear-view mirror for a vehicle with a reflective surface

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Publication number Priority date Publication date Assignee Title
GB2002163A (en) * 1977-08-04 1979-02-14 Siemens Ag Methods of displaying data to drivers in vehicles or vessels
US20020036955A1 (en) * 1998-02-27 2002-03-28 Naci Basturk Display assembly including two superposed display devices
WO2001031371A1 (en) * 1999-10-25 2001-05-03 3M Innovative Properties Company Polarizer constructions and display devices exhibiting unique color effects
WO2002029484A2 (en) * 2000-09-29 2002-04-11 Innovative Technology Licensing, Llc High brightness transflective lcd and method using tunable mirror
DE10052751A1 (en) * 2000-10-25 2002-05-08 Mannesmann Vdo Ag Rear-view mirror for a vehicle with a reflective surface

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021000824A1 (en) * 2019-07-01 2021-01-07 深圳秋田微电子股份有限公司 Anti-dazzling rear view mirror and automobile

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