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WO1998006087A1 - Dispositif d'affichage a systeme d'eclairage de fond - Google Patents

Dispositif d'affichage a systeme d'eclairage de fond Download PDF

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Publication number
WO1998006087A1
WO1998006087A1 PCT/EP1997/003949 EP9703949W WO9806087A1 WO 1998006087 A1 WO1998006087 A1 WO 1998006087A1 EP 9703949 W EP9703949 W EP 9703949W WO 9806087 A1 WO9806087 A1 WO 9806087A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
display device
light sources
emitting diodes
segments
Prior art date
Application number
PCT/EP1997/003949
Other languages
German (de)
English (en)
Inventor
Peter Brandt
Klaus Heberle
Original Assignee
Mannesmann Vdo 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 Mannesmann Vdo Ag filed Critical Mannesmann Vdo Ag
Publication of WO1998006087A1 publication Critical patent/WO1998006087A1/fr

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
    • G02F1/133603—Direct backlight with LEDs
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • 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
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0235—Field-sequential colour display

Definitions

  • the invention relates to a display device for displaying colored images with an LCD screen, which has a plurality of segments that are switchable in terms of transmission, and are assigned to individual pixels, with a light box arranged behind the LCD screen, designed to illuminate the LCD screen by means of several light sources, and with a control unit for controlling the segments and the light sources.
  • Such display devices are used for display in many devices and are therefore known.
  • the segments of the LCD screen represent individual pixels from which the images are composed.
  • the color representation of the images is often achieved in that a color filter is arranged behind the LCD screen.
  • the display device is thus suitable, for example, for displaying images such as warnings, city maps or status information in a motor vehicle.
  • a disadvantage of the known display device is that the color filter absorbs a high proportion of the light emitted by the light sources. This leads to a high current requirement for the light sources and to high temperatures in the light box.
  • the invention is based on the problem of designing a display device of the type mentioned at the outset in such a way that it can be produced as cost-effectively as possible and avoids high temperatures in the light box.
  • the display device With this design, a large number of images can be displayed by the display device in different colors without the use of a color filter in the light box. Due to the simultaneous and sequential activation of the light sources each having one of the colors and the segments of the LCD screen assigned to the respective color, the colored image is successively composed of a red, a blue and a yellow image. Due to the sluggishness of the human eye, the image appears colored to a viewer of the display device. The fact that no color filter is required to color-illuminate the LCD screen means that a particularly large proportion of the light generated by the light sources reaches the viewer. With the same intended brightness of the display device, fewer or weaker light sources can be used compared to the prior art. The The pointing device therefore heats up less. By eliminating the color filter, the display device can be produced particularly cost-effectively.
  • the display device is suitable for displaying still or moving images, such as for warnings, if the frequency of the activation of the light sources and the segments can be changed by the activation unit.
  • the highest possible frequency is required to display a still or moving image flicker-free for the human eye.
  • the frequency can be reduced and a flickering image that attracts the attention of a viewer can be generated.
  • the display device according to the invention is particularly suitable for use in a motor vehicle or in a monitoring system.
  • the LEDs are available for the three primary colors, so that the LCD screen can be illuminated with any color. Furthermore, the LEDs have the advantage of having a particularly low inertia when switching.
  • the display device requires particularly few light sources if the light-emitting diodes are designed as multi-chip light-emitting diodes. With this design, a particularly small number of light sources are required, since each of the light-emitting diodes is designed to produce any color. According to another advantageous development of the invention, display devices with a particularly high brightness can be produced inexpensively if the light sources are designed as neon tubes.
  • the invention permits numerous embodiments. To further clarify its basic principle, one of these is shown in the drawing and is described below. In a single figure, this shows a display device according to the invention in a longitudinal section.
  • the display device has an LCD screen 2 arranged on a light box 1.
  • the light box 1 and the LCD screen 2 are electrically connected to a control unit 3.
  • the LCD screen 2 has a multiplicity of segments 4, the transmittance of which can be switched individually by the control unit 3.
  • a plurality of light-emitting diodes 5-7 which have the three primary colors, are arranged in the light box 1. Light emitted by the light emitting diodes 5 - 7 spreads evenly in the light box 1 and penetrates segments 4 of the LCD screen 2 switched to high transmission.
  • the light emitting diodes 5 - 7 are interconnected for each of the basic colors and are thus controlled together by the control unit 3 .
  • An image is displayed from pixels by correspondingly switching the segments 4 on the LCD screen 2.
  • the light emitting diodes 5 - 7 having the intended color are controlled by the control unit 3.
  • the segments 4 and the light emitting diodes 5-7 By briefly switching the segments 4 and the light emitting diodes 5-7, a large number of images can be displayed in a short period of time.
  • multicolored images are created for the human eye.

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Mathematical Physics (AREA)
  • Computer Hardware Design (AREA)
  • Theoretical Computer Science (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

L'invention concerne un dispositif d'affichage comportant un écran ACL (à affichage à cristaux liquides) (2) et un caisson lumineux (1) monté derrière l'écran ACL (2). Plusieurs diodes lumineuses (5-7) présentant des couleurs primaires sont disposées dans le caisson lumineux (1). Les diodes lumineuses (5-7) peuvent être commutées avec une unité de commande (3) simultanément avec des segments individuels de l'écran ACL (2) qui correspondent aux points d'une image. Ce système permet de représenter toutes sortes d'images en couleur sur l'écran ACL (2). Une commutation particulièrement brève des diodes lumineuses (5-7) et de l'écran ACL (2) permet de faire apparaître des images multicolores pour l'oeil.
PCT/EP1997/003949 1996-08-06 1997-07-22 Dispositif d'affichage a systeme d'eclairage de fond WO1998006087A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19631700A DE19631700A1 (de) 1996-08-06 1996-08-06 Anzeigevorrichtung
DE19631700.2 1996-08-06

Publications (1)

Publication Number Publication Date
WO1998006087A1 true WO1998006087A1 (fr) 1998-02-12

Family

ID=7801910

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1997/003949 WO1998006087A1 (fr) 1996-08-06 1997-07-22 Dispositif d'affichage a systeme d'eclairage de fond

Country Status (2)

Country Link
DE (1) DE19631700A1 (fr)
WO (1) WO1998006087A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2333392A (en) * 1998-01-19 1999-07-21 Matsushita Electric Industrial Co Ltd Display with variable colour backlight

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6842170B1 (en) * 1999-03-17 2005-01-11 Motorola, Inc. Display with aligned optical shutter and backlight cells applicable for use with a touchscreen
DE10201029A1 (de) * 2002-01-11 2003-07-24 Siemens Ag Anzeigevorrichtung
DE102006009551B4 (de) * 2006-02-28 2008-07-03 Aes Aircraft Elektro/Elektronik System Gmbh Vorrichtung zum Erzeugen von Licht
DE102008023505B4 (de) * 2008-05-09 2021-02-04 Volkswagen Ag Unterstützung eines Infotainment-Systems durch Farbcodierung
US9443492B2 (en) 2010-12-08 2016-09-13 Schott Ag Display with non-homogenous spectral transmission curve
DE202010013087U1 (de) 2010-12-08 2011-02-24 Schott Ag Anzeige
DE102010061123A1 (de) 2010-12-08 2012-06-14 Schott Ag Anzeige
DE202016103849U1 (de) 2016-07-15 2017-10-18 Rp-Technik Gmbh Rettungszeichenleuchte

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4842378A (en) * 1987-04-07 1989-06-27 Alphasil, Inc. Method of illuminating flat panel displays to provide CRT appearing displays
EP0478186A2 (fr) * 1990-09-25 1992-04-01 THORN EMI plc Dispositif d'affichage
US5359345A (en) * 1992-08-05 1994-10-25 Cree Research, Inc. Shuttered and cycled light emitting diode display and method of producing the same
US5499120A (en) * 1992-06-26 1996-03-12 Motorola, Inc. Liquid crystal device having LEDs of a wide polar lighting angle, the polar angle determining the LEDs spacing
WO1996033483A1 (fr) * 1995-04-18 1996-10-24 Cambridge Display Technology Limited Affichage

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3633708A1 (de) * 1986-10-03 1988-04-14 Bernd Haastert Passive oder aktive displays mit peripherischer, teilintegrierter und vollintegrierter ansteuerung
DE4027858A1 (de) * 1990-09-03 1992-03-05 Vdo Schindling Anzeigeeinrichtung
DE4216529A1 (de) * 1992-05-19 1993-11-25 Vdo Schindling Anzeigevorrichtung für Kraftfahrzeuge

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4842378A (en) * 1987-04-07 1989-06-27 Alphasil, Inc. Method of illuminating flat panel displays to provide CRT appearing displays
EP0478186A2 (fr) * 1990-09-25 1992-04-01 THORN EMI plc Dispositif d'affichage
US5499120A (en) * 1992-06-26 1996-03-12 Motorola, Inc. Liquid crystal device having LEDs of a wide polar lighting angle, the polar angle determining the LEDs spacing
US5359345A (en) * 1992-08-05 1994-10-25 Cree Research, Inc. Shuttered and cycled light emitting diode display and method of producing the same
WO1996033483A1 (fr) * 1995-04-18 1996-10-24 Cambridge Display Technology Limited Affichage

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2333392A (en) * 1998-01-19 1999-07-21 Matsushita Electric Industrial Co Ltd Display with variable colour backlight
GB2333392B (en) * 1998-01-19 2001-05-16 Matsushita Electric Industrial Co Ltd Portable terminal device

Also Published As

Publication number Publication date
DE19631700A1 (de) 1998-02-12

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