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WO1988004789A1 - Dispositif d'affichage a cellule a cristaux liquides - Google Patents

Dispositif d'affichage a cellule a cristaux liquides Download PDF

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Publication number
WO1988004789A1
WO1988004789A1 PCT/DE1987/000461 DE8700461W WO8804789A1 WO 1988004789 A1 WO1988004789 A1 WO 1988004789A1 DE 8700461 W DE8700461 W DE 8700461W WO 8804789 A1 WO8804789 A1 WO 8804789A1
Authority
WO
WIPO (PCT)
Prior art keywords
liquid crystal
crystal cell
transflector
display device
reflector
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/DE1987/000461
Other languages
German (de)
English (en)
Inventor
George Goddard
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of WO1988004789A1 publication Critical patent/WO1988004789A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133605—Direct backlight including specially adapted reflectors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K35/00—Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles
    • B60K35/20—Output arrangements, i.e. from vehicle to user, associated with vehicle functions or specially adapted therefor
    • B60K35/21—Output arrangements, i.e. from vehicle to user, associated with vehicle functions or specially adapted therefor using visual output, e.g. blinking lights or matrix displays
    • B60K35/22—Display screens
    • 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
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133604—Direct backlight with lamps
    • 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
    • G02F1/1336—Illuminating devices
    • G02F1/133621—Illuminating devices providing coloured light
    • G02F1/133622—Colour sequential illumination
    • 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
    • G02F2203/00—Function characteristic
    • G02F2203/09—Function characteristic transflective

Definitions

  • the invention relates to a display device with at least one liquid crystal cell according to the preamble of the main claim.
  • a transflector is arranged directly behind the LCD, with which the light incident on the LCD from the outside is partially reflected forward in the controlled areas of the LCD thereby improving the contrast of the display in daylight.
  • the LCD display is illuminated by backlighting in the controlled LCD areas, in which part of the backlight exits to the front through the transflector.
  • the reflected part of this light is diffusely emitted at the rear of the transflector and is lost.
  • a more or less large proportion of the light is reflected.
  • the aim of the present invention is to improve uniform illumination of one or more liquid crystal cells lying next to one another or a specific area of a liquid crystal cell and at the same time to achieve better light yield.
  • the display device with the characterizing features of the main claim has the advantage that the transflector arranged between the liquid crystal cell and the light sources is used specifically for the uniform distribution of the light, in that the light diffusely reflected by it in turn is used by the ordered reflector is thrown back directly or indirectly onto the entire surface of the transflector.
  • the light emitted directly or indirectly from the light source to the transflector is practically completely used to illuminate the liquid crystal cell. Since only a small part of 10 to 20% of the light generated is lost due to the matting of the light sources, the overall light yield is greatly improved by omitting the raster film, so that the light output can be considerably reduced with the same brightness of the liquid crystal cell .
  • Another advantage is that the distance of the trans-reflector from the liquid crystal cell allows the light transmitted by the trans-reflector to be diffusely distributed over the entire back of the LCD, thus further improving the linearization or the uniformity of the LCD illumination.
  • a transflector in the display device, which has a reflectance of about 50% on its side facing the rear lighting, so that the remaining 50% of the light is radiated diffusely towards the LCD.
  • a transflector in the display device, which has a reflectance of about 50% on its side facing the rear lighting, so that the remaining 50% of the light is radiated diffusely towards the LCD.
  • the externally frosted lamps with different colors and to be able to be switched on separately from one another, so that individual areas of the LCD can be illuminated with different colors or the color tones on the LCD can be switched.
  • the reflector expediently forms part of the housing, which accommodates the LCD together with the transflector and the lamps. drawing
  • FIG. 1 An embodiment of the invention is shown in the drawing and explained in more detail in the following description.
  • the figure shows a display device with a liquid crystal cell for a motor vehicle.
  • a display device for a motor vehicle is designated 10.
  • a housing 11 carries at the front a transmissive liquid crystal cell 12 with the usual structure, according to which a liquid crystal substance between two electrodes having glass plates is filled and sealed.
  • the liquid crystal cell 12 carries on its back a scattering film 13 and at a distance behind it a color filter 14.
  • the controlled areas of the liquid crystal cell become clearly brighter from the outside than the other, blocked areas of the liquid crystal cell.
  • the illumination on the liquid crystal cell 12 must be as uniform as possible in the area in which the information is to be displayed.
  • the rear lighting is from at least one externally frosted light source in a Re open to the liquid crystal cell 12 arranged reflector 16, which is completed by the transflector 15 to the liquid crystal cell 12.
  • a plurality of mutually arranged, externally matted lamps 17, which are used in a region of the reflector 16 opposite the transflector 15, serve as the light source.
  • the rear lighting is realized by a plurality of light bulbs or by only one of these light bulbs.
  • the outer matting 18 is produced in a known manner by roughening the glass bulb surface, for example by etching or sandblasting, in order to achieve a greater scatter of the light emerging from the lamps on the surface of the lamps 17.
  • the reflector 16 forms the rear part of the housing 11 in that this part is provided on the inside with a reflection layer 19.
  • the transflector 15 consists of a disk made of a translucent material, which is provided on its surface facing the lamps 17 with a light-reflecting lacquer layer 20.
  • the lacquer layer 20 is formed such that the transflector 16 has a reflectance of about 50% on its surface facing the rear lighting, so that the rest of the light of likewise about 50% through the transflector 15 through to the liquid crystal cell 12 can reach.
  • the light transmitted by the transflector 15 is distributed very evenly over the area of the liquid crystal cell 12 intended for information displays.
  • the color filter 14 between the liquid crystal cell 12 and the transflector 15 becomes a desired one Color tint of the display achieved.
  • the spacing between the liquid crystal cell 12 and the transflector 15 and the scattering film 13 arranged there causes the light transmitted by the transflector 15 to be further scattered, so that the liquid crystal cell 12 is illuminated uniformly even to a degree of linearization of 90% is improved.
  • the housing and the reflector can be formed in two parts or the reflector can be a special part accommodated by the housing.
  • the matting of the lamps 17 can also be done in different ways.
  • the lamps 17 can have a color tint or they can be provided with different colors and can be switched on separately from one another. This enables a color change for the display.
  • a further transflector can also be arranged directly behind the liquid crystal cell, for example instead of the scattering film 13 or in addition thereto, the partially reflecting surface of which is then directed towards the liquid crystal cell 12.
  • the degree of reflection is preferably less than 50% of the light incident from the outside in the controlled areas of the liquid crystal cell 12.
  • the rear lighting of the liquid crystal cell consists of at least one matted light source which is arranged in a reflector which is open towards the liquid crystal cell and which is closed off by the transflector at a distance from the liquid crystal cell.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Nonlinear Science (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Mathematical Physics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Liquid Crystal (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Instrument Panels (AREA)

Abstract

Il s'agit d'un dispositif d'affichage avec au moins une cellule à cristaux liquides (12), notamment pour véhicule automobile, dont la partie commandée est éclairée par un flux dirigé par l'arrière. Pour obtenir un éclairage de la cellule qui soit uniforme et à faible perte, l'éclairage est réalisé par une source de lumière diffuse (17) située dans un réflecteur (16) ouvert. Ce réflecteur (16) est fermé devant la cellule à cristaux liquides (12) par un transmetteur-réflecteur (15), ce dernier étant situé à une certaine distance derrière la cellule à cristaux liquides (12).
PCT/DE1987/000461 1986-12-20 1987-10-10 Dispositif d'affichage a cellule a cristaux liquides Ceased WO1988004789A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863643841 DE3643841A1 (de) 1986-12-20 1986-12-20 Anzeigevorrichtung mit fluessigkristallzelle
DEP3643841.3 1986-12-20

Publications (1)

Publication Number Publication Date
WO1988004789A1 true WO1988004789A1 (fr) 1988-06-30

Family

ID=6316834

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1987/000461 Ceased WO1988004789A1 (fr) 1986-12-20 1987-10-10 Dispositif d'affichage a cellule a cristaux liquides

Country Status (5)

Country Link
EP (1) EP0337989A1 (fr)
AU (1) AU8034987A (fr)
DE (2) DE8634222U1 (fr)
ES (1) ES2005999A6 (fr)
WO (1) WO1988004789A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0463285A1 (fr) * 1990-06-26 1992-01-02 Nihon Kaiheiki Industrial Co., Ltd. Interrupteur à bouton-poussoir avec affichage à cristaux liquides
GB2269928A (en) * 1992-08-18 1994-02-23 Nokia Mobile Phones Ltd Display
GB2301894B (en) * 1995-06-07 1998-03-11 Toyoda Gosei Kk Light-driven display device

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3834492A1 (de) * 1988-10-11 1990-04-12 Langmatz Lic Gmbh Leuchtanzeigeeinrichtung
DE3921304A1 (de) * 1989-06-29 1991-01-10 Hella Kg Hueck & Co Anzeigeeinrichtung
US4975808A (en) * 1989-10-02 1990-12-04 Motorola, Inc. Backlighting apparatus
CA2097109C (fr) * 1992-06-01 2000-01-11 Shozo Kokawa Affichage a cristaux liquides
FR2708239B1 (fr) * 1993-07-26 1995-09-08 Sagem Tableau de bord à face unique et à cases à lumière.
DE19536825A1 (de) * 1995-09-20 1997-03-27 Dsd Dynamisch Statische Displa Lichtsteuer-Anzeigevorrichtung für transflektiven Betrieb
DE19908404C2 (de) * 1999-02-26 2002-01-24 Airsigna Gmbh & Co Kg Innenbeleuchtung für Fahrzeuge, insbesondere Luft- und Wasserfahrzeuge
DE19935386A1 (de) † 1999-07-29 2001-02-01 Mannesmann Vdo Ag Anzeige mit einem durchleuchtbaren Anzeigefeld
EP1126311A3 (fr) * 2000-02-19 2003-11-05 Siemens Aktiengesellschaft Dispositif d'affichage
DE10027635A1 (de) * 2000-02-19 2001-08-23 Mannesmann Vdo Ag Anzeigeeinrichtung
DE10139854A1 (de) * 2001-08-10 2003-02-27 Opel Adam Ag Anzeigeeinrichtung

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2043979A (en) * 1979-03-12 1980-10-08 Timex Corp Backlight for electrooptic display devicee
DE3022543A1 (de) * 1979-06-18 1981-01-22 Gen Motors Corp Fluessigkristall-anzeige
DE3314693A1 (de) * 1983-04-22 1984-10-25 Grundig E.M.V. Elektro-Mechanische Versuchsanstalt Max Grundig & Co KG, 8510 Fürth Einrichtung zur beleuchtung eines fluessigkristallanzeigeelementes
EP0167368A2 (fr) * 1984-06-30 1986-01-08 Nippon Seiki Co. Ltd. Dispositif d'affichage à cristal liquide
WO1986000449A1 (fr) * 1984-06-30 1986-01-16 Mannesmann Kienzle Gmbh Dispositif d'affichage electronique
EP0198115A1 (fr) * 1985-04-13 1986-10-22 Diemer & Fastenrath Affichage à cristal liquide

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2043979A (en) * 1979-03-12 1980-10-08 Timex Corp Backlight for electrooptic display devicee
DE3022543A1 (de) * 1979-06-18 1981-01-22 Gen Motors Corp Fluessigkristall-anzeige
DE3314693A1 (de) * 1983-04-22 1984-10-25 Grundig E.M.V. Elektro-Mechanische Versuchsanstalt Max Grundig & Co KG, 8510 Fürth Einrichtung zur beleuchtung eines fluessigkristallanzeigeelementes
EP0167368A2 (fr) * 1984-06-30 1986-01-08 Nippon Seiki Co. Ltd. Dispositif d'affichage à cristal liquide
WO1986000449A1 (fr) * 1984-06-30 1986-01-16 Mannesmann Kienzle Gmbh Dispositif d'affichage electronique
EP0198115A1 (fr) * 1985-04-13 1986-10-22 Diemer & Fastenrath Affichage à cristal liquide

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0463285A1 (fr) * 1990-06-26 1992-01-02 Nihon Kaiheiki Industrial Co., Ltd. Interrupteur à bouton-poussoir avec affichage à cristaux liquides
GB2269928A (en) * 1992-08-18 1994-02-23 Nokia Mobile Phones Ltd Display
GB2301894B (en) * 1995-06-07 1998-03-11 Toyoda Gosei Kk Light-driven display device
US5949346A (en) * 1995-06-07 1999-09-07 Toyoda Gosei Co., Ltd. Light-driven display device

Also Published As

Publication number Publication date
EP0337989A1 (fr) 1989-10-25
ES2005999A6 (es) 1989-04-01
AU8034987A (en) 1988-07-15
DE3643841A1 (de) 1988-06-30
DE8634222U1 (de) 1988-04-21

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