WO1998006087A1 - Display with background illumination system - Google Patents

Display with background illumination system 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)
French (fr)
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/en

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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

Abstract

In a display with an LCD-screen (2) and a light box (1) arranged behind the LCD-screen (2), several luminescent diodes (5-7) with the primary colours are arranged in the light box (1). The luminescent diodes (5-7) can be switched by a driving unit (3) at the same time as individual segments (4) of the LCD-screen (2) which correspond to picture elements of a picture. Any desired coloured images can thus be displayed on the LCD-screen (2). By switching the luminescent diodes (5-7) and LCD-screen (2) for a particularly short time, images which seem multicoloured to the human eye are produced.

Description

Beschreibung description
ANZEIGEVORRICHTUNG MIT HINTERGRUNDBELEUCHTUNGSEINRICHTUNGDISPLAY DEVICE WITH BACKLIGHTING DEVICE
Die Erfindung betrifft eine Anzeigevorrichtung zur Anzeige von farbigen Bildern mit einem LCD-Bildschirm, welcher mehrere in ihrem Transmissionsvermögen schaltbare, einzelnen Bildpunkten zugeordnete Segmente aufweist, mit einem hinter dem LCD-Bildschirm angeordneten, zur Durchleuchtung des LCD-Bildschirms mittels mehrerer Lichtquellen ausgebildeten Lichtkasten und mit einer Ansteuereinheit zum Ansteuern der Segmente und der Lichtquellen.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.
Solche Anzeigevorrichtungen werden zur Anzeige in vielen Geräten eingesetzt und sind damit bekannt. Die Segmente des LCD-Bildschirms stellen einzelne Bildpunkte dar, aus denen die Bilder zusammengesetzt sind. Die farbige Darstellung der Bilder wird häufig dadurch erreicht, daß hinter dem LCD-Bildschirm ein Farbfilter angeordnet ist. Die Anzeigevorrichtung eignet sich damit beispielsweise zum Darstellen von Bildern wie Warnhinweise, Stadtpläne oder Zustandsinformationen in einem Kraftfahrzeug. Nachteilig bei der bekannten Anzeigevorrichtung ist, daß der Farbfilter einen hohen Anteil des von den Lichtquellen abgestrahlten Lichts absorbiert. Dies führt zu einem hohen Strombedarf für die Lichtquellen und zu hohen Temperaturen in dem Lichtkasten.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.
Der Erfindung liegt das Problem zugrunde, eine Anzeigevorrichtung der eingangs genannten Art so zu gestalten, daß sie möglichst kostengünstig herstellbar ist und hohe Temperaturen im Lichtkasten vermeidet.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.
Dieses Problem wird erfindungsgemäß dadurch gelöst, daß für jede Grundfarbe zumindest eine Lichtquelle vorgesehen ist und daß die Ansteuereinheit zum Zusammensetzen des farbigen Bildes aus den Grundfarben durch ein aufeinanderfolgendes Ansteuern der die einzelnen Grundfarben erzeugenden Lichtquellen zeitgleich mit den der jeweiligen Grundfarbe zugeordneten Segmenten ausgebildet ist.This problem is solved in accordance with the invention in that at least one light source is provided for each primary color and in that the control unit for assembling the colored image from the primary colors is designed at the same time as the segments assigned to the respective primary color by sequentially actuating the light sources producing the individual primary colors.
Durch diese Gestaltung läßt sich eine Vielzahl von Bildern durch die Anzeigevorrichtung in verschiedenen Farben ohne den Einsatz eines Farbfilters im Lichtkasten darstellen. Durch die zeitgleiche und aufeinanderfolgende Ansteuerung der jeweils eine der Farben aufweisenden Lichtquellen und der der jeweiligen Farbe zugeordneten Segmente des LCD-Bildschirms wird das farbige Bild nacheinander aus einem roten, einem blauen und einem gelben Bild zusammengesetzt. Durch die Trägheit des menschlichen Auges erscheint das Bild für einen Betrachter der Anzeigevorrichtung farbig. Dadurch, daß kein Farbfilter zur farbigen Durchleuchtung des LCD-Bildschirms benötigt wird, gelangt ein besonders großer Anteil des von den Lichtquellen erzeugten Lichts zu dem Betrachter. Bei gleicher vorgesehener Helligkeit der Anzeigevorrichtung können damit im Vergleich zum Stand der Technik weniger oder schwächere Lichtquellen eingesetzt werden. Die An- Zeigevorrichtung heizt sich deshalb weniger stark auf. Durch den Wegfall des Farbfilters ist die Anzeigevorrichtung besonders kostengünstig herstellbar.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.
Die Anzeigevorrichtung eignet sich gemäß einer vorteilhaften Weiterbildung der Erfindung zur Anzeige von stehenden oder bewegten Bildern wie für Warnhinweise, wenn die Frequenz der Ansteuerung der Lichtquellen und der Segmente durch die Ansteuereinheit veränderbar ist. Für eine Darstellung eines für das menschliche Auge flimmerfreien stehenden oder bewegten Bildes ist eine möglichst hohe Frequenz erforderlich. Zur Anzeige von Warnhinweisen kann die Frequenz verringert und damit ein flimmerndes, die Aufmerksamkeit eines Betrachters erregendes Bild erzeugt werden. Hierdurch eignet sich die erfindungsgemäße Anzeigevorrichtung besonders für einen Einsatz in einem Kraftfahrzeug oder in einer Überwachungsanlage.According to an advantageous development of the invention, 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. To display warnings, the frequency can be reduced and a flickering image that attracts the attention of a viewer can be generated. As a result, the display device according to the invention is particularly suitable for use in a motor vehicle or in a monitoring system.
Ein dauerhafter Betrieb der Lichtquellen führt nur zu einem unwesentlichen Aufheizen des Lichtkastens, wenn die Lichtquellen gemäß einer anderen vorteilhaften Weiterbildung der Erfindung von Leuchtdioden gebildet sind. Die Leuchtdioden sind für die drei Grundfarben verfügbar, so daß sich der LCD-Bildschirm mit beliebigen Farben durchleuchten läßt. Weiterhin haben die Leuchtdioden den Vorteil, eine besonders geringe Trägheit beim Schalten aufzuweisen.Permanent operation of the light sources only leads to insignificant heating of the light box if the light sources are formed by light-emitting diodes according to another advantageous development of the invention. 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.
Die Anzeigevorrichtung benötigt gemäß einer anderen vorteilhaften Weiterbildung der Erfindung besonders wenige Lichtquellen, wenn die Leuchtdioden als Mehrchip- Leuchtdioden ausgebildet sind. Durch diese Gestaltung sind besonders wenige Lichtquellen erforderlich, da jede der Leuchtdioden zur Erzeugung einer beliebigen Farbe ausgebildet ist. Anzeigevorrichtungen mit einer besonders großen Helligkeit sind gemäß einer anderen vorteilhaften Weiterbildung der Erfindung kostengünstig herstellbar, wenn die Lichtquellen als Neonröhren ausgebildet sind.According to another advantageous development of the invention, 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.
Die Erfindung läßt zahlreiche Ausführungsformen zu. Zur weiteren Verdeutlichung ihres Grundprinzips ist eine davon in der Zeichnung dargestellt und wird nachfolgend beschrieben. Diese zeigt in einer einzigen Figur eine erfindungsgemäße Anzeigevorrichtung in einem Längsschnitt.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.
Die Anzeigevorrichtung hat einen auf einem Lichtkasten 1 angeordneten LCD-Bildschirm 2. Der Lichtkasten 1 und der LCD-Bildschirm 2 sind elektrisch mit einer Ansteuereinheit 3 verbunden. Der LCD-Bildschirm 2 hat eine Vielzahl von Segmenten 4, deren Transmissionsvermögen einzeln von der Ansteuereinheit 3 schaltbar ist. In dem Lichtkasten 1 sind mehrere, die drei Grundfarben aufweisende Leuchtdioden 5 - 7 angeordnet. Von den Leuchtdioden 5 - 7 abgestrahltes Licht breitet sich gleichmäßig in dem Lichtkasten 1 aus und durchdringt auf hohe Transmission geschaltete Segmente 4 des LCD-Bildschirms 2. Die Leuchtdioden 5 - 7 sind für jede der Grundfarben zusammengeschaltet und werden damit von der Ansteuereinheit 3 gemeinsam angesteuert .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 .
Ein Bild wird aus Bildpunkten durch ein entsprechendes Schalten der Segmente 4 auf dem LCD-Bildschirm 2 dargestellt. Gleichzeitig werden die die vorgesehene Farbe aufweisenden Leuchtdioden 5 - 7 von der Ansteuereinheit 3 angesteuert. Durch ein kurzzeitiges Schalten der Segmente 4 und der Leuchtdioden 5 - 7 lassen sich eine Vielzahl von Bildern in einer kurzen Zeitspanne darstellen. Durch ein aufeinanderfolgendes Erzeugen der Bilder in den Grundfarben entstehen für das menschliche Auge mehrfarbige Bilder. An image is displayed from pixels by correspondingly switching the segments 4 on the LCD screen 2. At the same time, the light emitting diodes 5 - 7 having the intended color are controlled by the control unit 3. 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. By successively generating the images in the primary colors, multicolored images are created for the human eye.

Claims

Patentansprüche claims
1. Anzeigevorrichtung zur Anzeige von farbigen Bildern mit einem LCD-Bildschirm, welcher mehrere in ihrem Transmissionsvermögen schaltbare, einzelnen Bildpunkten zugeordnete Segmente aufweist, mit einem hinter dem LCD- Bildschirm angeordneten, zur Durchleuchtung des LCD- Bildschirms mittels mehrerer Lichtquellen ausgebildeten Lichtkasten und mit einer Ansteuereinheit zum Ansteuern der Segmente und der Lichtquellen, dadurch gekennzeichnet, daß für jede Grundfarbe zumindest eine Lichtquelle (Leuchtdiode 5 - 7) vorgesehen ist und daß die Ansteuereinheit (3) zum Zusammensetzen des farbigen Bildes aus den Grundfarben durch ein aufeinanderfolgendes Ansteuern der die einzelnen Grundfarben erzeugenden Lichtquellen (Leuchtdiode 5 - 7) zeitgleich mit den der jeweiligen Grundfarbe zugeordneten Segmenten (4) ausgebildet ist.1. Display device for displaying colored images with an LCD screen, which has a plurality of segments which are switchable in terms of their transmissibility 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 one Control unit for controlling the segments and the light sources, characterized in that at least one light source (light emitting diodes 5 - 7) is provided for each basic color and that the control unit (3) for assembling the colored image from the basic colors by successively activating the individual basic colors generating light sources (light emitting diodes 5 - 7) is formed simultaneously with the segments (4) assigned to the respective basic color.
2. Anzeigevorrichtung nach Anspruch 1 , dadurch gekennzeichnet, daß die Frequenz der Ansteuerung der Lichtquellen (Leuchtdiode 5 - 7) und der Segmente (4) durch die Ansteuereinheit (3) veränderbar ist. 2. Display device according to claim 1, characterized in that the frequency of the control of the light sources (light emitting diode 5-7) and the segments (4) by the control unit (3) is variable.
3. Anzeigevorrichtung nach Anspruch 1 oder 2 , dadurch gekennzeichnet, daß die Lichtquellen von Leuchtdioden (5 - 7) gebildet sind.3. Display device according to claim 1 or 2, characterized in that the light sources are formed by light-emitting diodes (5-7).
4. Anzeigevorrichtung nach Anspruch 3 , dadurch gekennzeichnet, daß die Leuchtdioden (5 - 7) als RGB-Leucht- dioden ausgebildet sind .4. Display device according to claim 3, characterized in that the light-emitting diodes (5 - 7) are designed as RGB light-emitting diodes.
5. Anzeigevorrichtung nach Anspruch 1 oder 2 , dadurch gekennzeichnet, daß die Lichtquellen als Neonröhren ausgebildet sind. 5. Display device according to claim 1 or 2, characterized in that the light sources are designed as neon tubes.
PCT/EP1997/003949 1996-08-06 1997-07-22 Display with background illumination system WO1998006087A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19631700A DE19631700A1 (en) 1996-08-06 1996-08-06 Display device
DE19631700.2 1996-08-06

Publications (1)

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

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WO (1) WO1998006087A1 (en)

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GB2333392A (en) * 1998-01-19 1999-07-21 Matsushita Electric Ind Co Ltd Display with variable colour backlight

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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 (en) * 2002-01-11 2003-07-24 Siemens Ag display device
DE102006009551B4 (en) * 2006-02-28 2008-07-03 Aes Aircraft Elektro/Elektronik System Gmbh Device for generating light
DE102008023505B4 (en) * 2008-05-09 2021-02-04 Volkswagen Ag Support of an infotainment system through color coding
DE102010061123A1 (en) 2010-12-08 2012-06-14 Schott Ag Seven-segment-display for glass ceramic hob, has lighting element comprising two primary color-lamps i.e. laser diodes, where primary color intensity of lamps is corrected for compensating chromaticity coordinate offset of substrate
DE202010013087U1 (en) 2010-12-08 2011-02-24 Schott Ag display
WO2012076412A1 (en) 2010-12-08 2012-06-14 Schott Ag Display
DE202016103849U1 (en) 2016-07-15 2017-10-18 Rp-Technik Gmbh Signage

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GB2333392B (en) * 1998-01-19 2001-05-16 Matsushita Electric Ind Co Ltd Portable terminal device

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