WO2004017127A1 - Miroir comprenant un dispositif d'affichage - Google Patents

Miroir comprenant un dispositif d'affichage 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
Authority
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)
English (en)
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/fr

Links

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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Mechanical Engineering (AREA)
  • Liquid Crystal (AREA)

Abstract

L'invention concerne un miroir comprenant un dispositif d'affichage. Selon l'invention, une cellule à cristal liquide (1-7) sur la face opposée à l'observateur (face arrière) est pourvue d'un film convertisseur polarisant (9) qui laisse passer de manière polarisée la lumière venant de la face arrière et réfléchit la lumière venant de la face orientée vers l'utilisateur (face avant). Sur la face avant de la cellule à cristal liquide (1-7) se trouve un filtre de polarisation (8) dont la direction de polarisation passante est parallèle à la direction de polarisation passante du film convertisseur polarisant (9).
PCT/DE2003/002032 2002-07-24 2003-06-18 Miroir comprenant un dispositif d'affichage WO2004017127A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10233734.9 2002-07-24
DE2002133734 DE10233734A1 (de) 2002-07-24 2002-07-24 Spiegel mit einer Anzeigevorrichtung

Publications (1)

Publication Number Publication Date
WO2004017127A1 true WO2004017127A1 (fr) 2004-02-26

Family

ID=30010356

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2003/002032 WO2004017127A1 (fr) 2002-07-24 2003-06-18 Miroir comprenant un dispositif d'affichage

Country Status (2)

Country Link
DE (1) DE10233734A1 (fr)
WO (1) WO2004017127A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021000824A1 (fr) * 2019-07-01 2021-01-07 深圳秋田微电子股份有限公司 Rétroviseur intérieur anti-éblouissement et automobile

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE502005007961D1 (de) * 2004-10-26 2009-10-01 Volkswagen Ag Rückspiegel für ein kraftfahrzeug
US20070146481A1 (en) * 2005-12-12 2007-06-28 Volkswagen Ag Rear view mirror for a motor vehicle

Citations (5)

* Cited by examiner, † Cited by third party
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
WO2001031371A1 (fr) * 1999-10-25 2001-05-03 3M Innovative Properties Company Realisations de polariseur et dispositifs d'affichage a effets de couleur unique
US20020036955A1 (en) * 1998-02-27 2002-03-28 Naci Basturk Display assembly including two superposed display devices
WO2002029484A2 (fr) * 2000-09-29 2002-04-11 Innovative Technology Licensing, Llc Ecran lcd transflectif a haute luminosite et procede faisant appel a un miroir accordable
DE10052751A1 (de) * 2000-10-25 2002-05-08 Mannesmann Vdo Ag Rückspiegel für ein Fahrzeug mit einer spiegelnden Fläche

Patent Citations (5)

* Cited by examiner, † Cited by third party
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 (fr) * 1999-10-25 2001-05-03 3M Innovative Properties Company Realisations de polariseur et dispositifs d'affichage a effets de couleur unique
WO2002029484A2 (fr) * 2000-09-29 2002-04-11 Innovative Technology Licensing, Llc Ecran lcd transflectif a haute luminosite et procede faisant appel a un miroir accordable
DE10052751A1 (de) * 2000-10-25 2002-05-08 Mannesmann Vdo Ag Rückspiegel für ein Fahrzeug mit einer spiegelnden Fläche

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021000824A1 (fr) * 2019-07-01 2021-01-07 深圳秋田微电子股份有限公司 Rétroviseur intérieur anti-éblouissement et automobile

Also Published As

Publication number Publication date
DE10233734A1 (de) 2004-02-05

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