WO1997045826A1 - Colour display and uses of such a display - Google Patents

Colour display and uses of such a display Download PDF

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Publication number
WO1997045826A1
WO1997045826A1 PCT/DE1997/001080 DE9701080W WO9745826A1 WO 1997045826 A1 WO1997045826 A1 WO 1997045826A1 DE 9701080 W DE9701080 W DE 9701080W WO 9745826 A1 WO9745826 A1 WO 9745826A1
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WO
WIPO (PCT)
Prior art keywords
display
color
red
green
applications
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Application number
PCT/DE1997/001080
Other languages
German (de)
French (fr)
Inventor
Thomas Müller
Original Assignee
Msm Poly-Print 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 Msm Poly-Print Gmbh filed Critical Msm Poly-Print Gmbh
Priority to AU32531/97A priority Critical patent/AU3253197A/en
Priority to EP97928108A priority patent/EP0976123A1/en
Publication of WO1997045826A1 publication Critical patent/WO1997045826A1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141—Constructional details thereof
    • H04N9/315—Modulator illumination systems
    • H04N9/3164—Modulator illumination systems using multiple light sources
    • 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
    • G09G3/3413—Details of control of colour illumination sources
    • 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
    • G09G3/36—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 using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/16—Analogue secrecy systems; Analogue subscription systems
    • H04N7/162—Authorising the user terminal, e.g. by paying; Registering the use of a subscription channel, e.g. billing
    • H04N7/163—Authorising the user terminal, e.g. by paying; Registering the use of a subscription channel, e.g. billing by receiver means only
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3102—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators
    • H04N9/3105—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators for displaying all colours simultaneously, e.g. by using two or more electronic spatial light modulators
    • H04N9/3108—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators for displaying all colours simultaneously, e.g. by using two or more electronic spatial light modulators by using a single electronic spatial light modulator
    • 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
    • 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
    • G09G3/001—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes using specific devices not provided for in groups G09G3/02 - G09G3/36, e.g. using an intermediate record carrier such as a film slide; Projection systems; Display of non-alphanumerical information, solely or in combination with alphanumerical information, e.g. digital display on projected diapositive as background

Definitions

  • LC color displays have been on the market for a long time. They get their brightness from white backlighting, made up of neon fluorescent tubes, halogen lamps, metal halide lamps etc.
  • the aim of the invention is to improve the light yield significantly with the aid of simple monochrome LC displays and red, green and blue backlighting in a compact design and, at the same time, to reduce the rejection rate during production due to the simple design. According to the invention this is solved by the technical teaching of claim one.
  • a color display can be constructed from just a monochrome LC display, which generates colored images with a cyclic green-blue-red backlight.
  • the monochrome display is used as an active shadow mask.
  • the backlight can be constructed, for example, from a white light source, which generates the three colors in each case by means of a rotating color disk. To create a color image, the three color components must be mixed together. When generating 25 frames per second, this means that in the simplest case, 1/75 second is available per image and per color.
  • the color intensity is generated by opening the micro diaphragm (LCD pixel).
  • the compensation of the different brightnesses through inhomogeneities of the lighting is done by a Basic opening time achieved, that is, the darkest blue, red and green correspond to the basic opening time. This value is added to every further color value. It is determined and saved for each pixel in combination with the color. It is therefore also possible, for example, to compensate for color fluctuations in the color disks or in general the color background lighting.
  • the individual color components per pixel are combined over several images, so that the image reproduction frequency of the display can be adapted.
  • the clock rate of the LC display can therefore be less than 75 frames / s.
  • PDLC polymer dispersed liquid crystal
  • a variant for controlling the color intensity of the individual pixels is to use the gray value setting of the display. Depending on the intensity
  • the individual color pixels can thus be individually controlled.
  • the large number of overlapping diode light sources can cause discontinuities in the backlight.
  • These local minima and maxima can be compensated for by calibrating the individual pixels. For each color (blue, red, green) there is a significant base gray value for each pixel, so that the viewer of the display has one homogeneously illuminated colored screen per color. This calibration is stored digitally and serves as a comparison of the color values to be projected.
  • the digital control between backlight, display and image data is taken over by a powerful controller, preferably by a PC.
  • the display can also be used as a PC monitor.
  • a display constructed in this way can become a link between our digital and analog image display. It can be sold both as a pure PC and as a simple digital television receiver.
  • a particularly interesting application would be the display of high-resolution image and font information, as is typically published by magazines and daily newspapers.
  • all technical requirements for projection and storage for information by the PC are available. If you use the distribution of data via TV channels, you have an inexpensive means of transport for the huge flood of data.
  • the user only needs a TV receiver in his base unit.
  • the data could be sent at tariff-favorable times (e.g. at night) and encrypted using special digital codes.
  • the decoding that is possible at any desired time, the user needs a software key that is stored on a check card, or one receives his key digitally via the telephone network. Depending on the system, the fees for using the information can then be debited either when purchasing the software credit cards or directly via the telephone bill.
  • the application is particularly useful if the color display according to the invention is used as the basis for a projection device.
  • the compact, high-performance diode lighting enables high-quality background lighting to be achieved with a very high degree of efficiency. Weak points of such diode lighting have so far been the blue diodes. This disadvantage has been eliminated since there were 5A-N diodes with 100 times the luminous efficacy compared to SIC LEDs. It is therefore possible to produce a standard backlight with ten times the lifespan and an energy saving of 75% compared to conventional lighting.
  • the backlight is of course also suitable for the projection system based on digital micromirrors DMD developed by Texas Instruments.
  • the individual micromirrors are clocked here, similar to an LCD cell.
  • the local intensity fluctuations would be compensated for here by different flip times of the mirrors.
  • the background lighting must be as homogeneous as possible with regard to the three primary colors. This can be done, for example, by means of flat SMD diodes, which are arranged in a significant pattern depending on the color intensity and the radiation angle of the three primary colors red, blue and green.
  • the ratio currently applies:
  • this ratio can of course shift. It is therefore entirely possible to set up flat backlights for laptops; the installation depth does not correspond to more than 20 to 40 [mm].
  • Figure 1 Schematic representation of the display with projection application
  • FIG. 1 Schematic representation of an application of the display
  • the display according to the invention is shown schematically.
  • the three primary colors blue (1), green (2) and red (3) backlight the monochrome display (4, 9).
  • the microcontroller (7) preferably a PC, synchronizes the lighting with the display (4, 9) and the individual LCD pixels.
  • the image data are supplied via a TV module (8), which consists of a receiving part and a frame grabber, so that the digital image data is sent to the microcontroller via a fast data bus, preferably PCI.
  • the image from the color display can be enlarged onto projection screens (6) of any size using an optical lens system (5).
  • FIG. 2 shows schematically how the fee-based data are billed.
  • the display (9) with controller has a TV receiver (10) and a telephone connection (12) as well as a telephone card reader (11) or similar pay card systems. Equipped in this way, any amount of data can be transmitted via TV channels and can be selectively and independently saved and retrieved by the customer.
  • One application would be e.g. B. the distribution of regional daily newspapers.
  • the display according to the invention can be used anywhere in technical devices. Not only does it represent a high utility value due to its high quality optical images, it is also of great benefit from an energy policy and economic perspective. If one takes into account that the lifespan of diode lighting is 10 times as long as standard filament lighting with 75% energy savings at the same time, one or two nuclear or coal-fired power plants with an output of three to can easily be used with the invention as a TV device save five gigawatts.

Abstract

Described is a colour display which, owing to the use of new PDLC monochromic displays (4) and three-colour diode background illumination (1, 2, 3), have an extremely compact design and a very low energy consumption while giving a higher luminous efficiency. Since the display has no moving parts, it has a long service life. The equipment can also be used for the simultaneous projection of high-definition colour images in daylight on to projection screens. It is therefore possible to project high-quality pictures and texts from newspapers and books so that they are clear and easily legible. The images can be broadcast over TV channels and paid for in encoded form directly by the consumer using phone cards or similar means of payment.

Description

Beschreibungdescription
Farbdisplay und AnwendungenColor display and applications
LC-Farbdisplays sind seit langem auf dem Markt. Ihre Helligkeit bekommen sie durch weiße Hintergrundbeleuchtung, aufgebaut aus Neonleuchtstoffröhren, Halogenlampen, Metalldampflampen etc.LC color displays have been on the market for a long time. They get their brightness from white backlighting, made up of neon fluorescent tubes, halogen lamps, metal halide lamps etc.
Nachteilig hierbei ist vor allem, wenn diese Displays in Projektionsgeräte eingebaut werden, die starke Hitzeentwicklung der Hintergrundbeleuchtung, die gegebenenfalls das Display schädigen. Ein weiterer Schwachpunkt ist, daß diese LCDs über eine Polarisationsfolie verfügen, die allein 50% der Hintergrundbeleuchtung absorbiert.The disadvantage here is, above all, if these displays are installed in projection devices, the strong heat development of the backlight, which may damage the display. Another weak point is that these LCDs have a polarizing film that alone absorbs 50% of the backlight.
Bei hochauflösenden LC- oder TFT-Displays entsteht bei der Produktion eine hohe Ausschußquote, da es technisch sehr aufwendig ist, ein fehlerfreies Display zu fertigen. Für jeden Bildpunkt müssen drei LCDs aufgebaut werden, das sind rund 4,4 Millionen LCDs bei einer Auflösung von 1280 x 1024 Pixeln.In the case of high-resolution LC or TFT displays, there is a high rejection rate during production, since it is technically very complex to produce a faultless display. Three LCDs have to be built up for each pixel, that is around 4.4 million LCDs with a resolution of 1280 x 1024 pixels.
Ziel der Erfindung ist es, mit Hilfe einfacher monochrom-LC-Displays und roter, grüner und blauer Hintergrundbeleuchtung bei kompakter Bauweise die Lichtausbeute deutlich zu verbessern und gleichzeitig durch die einfache Bauweise die Ausschußquote bei der Produktion zu verringern. Erfindungsgemäß wird dieses durch die technische Lehre des Anspruchs eins gelöst.The aim of the invention is to improve the light yield significantly with the aid of simple monochrome LC displays and red, green and blue backlighting in a compact design and, at the same time, to reduce the rejection rate during production due to the simple design. According to the invention this is solved by the technical teaching of claim one.
Im einfachsten Fall kann ein Farbdisplay aus nur einem Monochrom-LC-Display aufgebaut werden, das mit einer zyklischen grün-blau-rot Hintergrundbeleuchtung farbige Bilder erzeugt. Das Monochrom-Display wird dabei als aktive Lochmaske benutzt. Die Hintergrundbeleuchtung kann zum Beispiel aus einer Weißlichtquelle aufgebaut sein, die mittels einer rotierenden Farbscheibe jeweils die drei Farben erzeugt. Um ein farbiges Bild zu erzeugen, müssen die drei Farbanteile miteinander gemischt werden. Bei Erzeugung von 25 Bildern pro Sekunde bedeutet dies, daß im einfachsten Fall pro Bild und pro Farbe 1/75 Sekunde zur Verfügung steht. Die Farbintensität wird dabei durch öffnen der Mikroblende (LCD-Pixel) erzeugt. Die Kompensation der unterschiedlichen Helligkeiten durch Inhomogenitäten der Beleuchtung wird dabei durch eine Basisöffiiungszeit erzielt, das heißt, daß das jeweils dunkelste blau, rot und grün der Grundöffiiungszeit entspricht. Dieser Wert wird jedem weiteren Farbwert aufgeschlagen. Er wird für jeden Pixel in Kombination zur Farbe ermittelt und gespeichert. Somit ist es zum Beispiel auch möglich, Farbschwankungen der Farbscheiben oder allgemein der Farbhintergrundbeleuchtung zu kompensieren.In the simplest case, a color display can be constructed from just a monochrome LC display, which generates colored images with a cyclic green-blue-red backlight. The monochrome display is used as an active shadow mask. The backlight can be constructed, for example, from a white light source, which generates the three colors in each case by means of a rotating color disk. To create a color image, the three color components must be mixed together. When generating 25 frames per second, this means that in the simplest case, 1/75 second is available per image and per color. The color intensity is generated by opening the micro diaphragm (LCD pixel). The compensation of the different brightnesses through inhomogeneities of the lighting is done by a Basic opening time achieved, that is, the darkest blue, red and green correspond to the basic opening time. This value is added to every further color value. It is determined and saved for each pixel in combination with the color. It is therefore also possible, for example, to compensate for color fluctuations in the color disks or in general the color background lighting.
Denkbar ist in diesem Zusammenhang auch, daß die einzelnen Farbanteile pro Pixel über mehrere Bilder zusammengefaßt werden, so daß die Bildwiedergabefrequenz des Displays angepaßt werden kann. Die Taktrate des LC-Displays kann dadurch geringer als 75 Bilder/s ausfallen.In this context, it is also conceivable that the individual color components per pixel are combined over several images, so that the image reproduction frequency of the display can be adapted. The clock rate of the LC display can therefore be less than 75 frames / s.
Besser ist es jedoch, die Hintergrundbeleuchtung mittels Farbdioden zu erzeugen. Für jede der drei Farben gibt es eine Diode. Für die flächige Ausleuchtung benötigt man also eine Vielzahl von Dioden, die in Abhängigkeit ihres Abstrahlwinkels kaskadenartig nebeneinander positioniert werden. Jede einzelne Diode beleuchtet somit eine Vielzahl von LCD-Pixeln. Über Pulsweitenmodulation ist man in der Lage, die Helligkeit jeder einzelnen Diode zu steuern und somit auch die Helligkeit des gesamten Displays zu beeinflussen.However, it is better to use color diodes to generate the backlight. There is a diode for each of the three colors. A large number of diodes are required for the areal illumination, which are positioned next to each other in a cascade depending on their beam angle. Each individual diode thus illuminates a large number of LCD pixels. Pulse width modulation enables you to control the brightness of each individual diode and thus to influence the brightness of the entire display.
Ein großer Nachteil bei den klassischen Displays ist die Polarisationsfolie zwischen LCD und Beleuchtung, die üblicherweise 50% des Lichtes absorbiert. Selbstpolarisierende Flüssigkristalle (PDLC = polymer dispersed liquid crystal) haben diesen Nachteil nicht, da sie auf Polarisationsfolien verzichten können. Aus diesem Grunde ist es zweckmäßig, das Display aus PDLC-Flüssigkristallen aufzubauen. Die Lichtausbeute wird somit deutlich erhöht.A major disadvantage of classic displays is the polarizing film between LCD and lighting, which usually absorbs 50% of the light. Self-polarizing liquid crystals (PDLC = polymer dispersed liquid crystal) do not have this disadvantage because they can do without polarizing films. For this reason, it is advisable to construct the display from PDLC liquid crystals. The light output is thus significantly increased.
Eine Variante zur Steuerung der Farbintensität der einzelnen Bildpunkte ist die Nutzung der Grauwerteinstellung des Displays. In Abhängigkeit der IntensitätA variant for controlling the color intensity of the individual pixels is to use the gray value setting of the display. Depending on the intensity
- schwache Farbe = hoher Grauwert,- weak color = high gray value,
- intensive Farbe = niedriger Grauwert können somit die einzelnen Farbpixel individuell gesteuert werden. Durch die Vielzahl der sich überlappenden Dioden-Lichtquellen kann es zu Unstetigkeitsstellen bei der Hintergrundbeleuchtung kommen. Diese lokalen Minima und Maxima können durch die Kalibrierung der einzelnen Pixel kompensiert werden. Für jede Farbe (blau, rot, grün) gibt es zu jedem Pixel einen signifikanten Basisgrauwert, so daß der Betrachter des Displays einen homogen ausgeleuchteten farbigen Bildschirm pro Farbe sieht. Diese Kalibrierung wird digital abgespeichert und dient als Abgleich der zu projizierenden Farbwerte.- intensive color = low gray value, the individual color pixels can thus be individually controlled. The large number of overlapping diode light sources can cause discontinuities in the backlight. These local minima and maxima can be compensated for by calibrating the individual pixels. For each color (blue, red, green) there is a significant base gray value for each pixel, so that the viewer of the display has one homogeneously illuminated colored screen per color. This calibration is stored digitally and serves as a comparison of the color values to be projected.
Es ist sinnvoll, daß die digitale Steuerung zwischen Hintergrundbeleuchtung, Display und Bilddaten von einem leistungsfähigen Controller übernommen wird, vorzugsweise von einem PC. Umgekehrt kann das Display somit auch als PC-Monitor genutzt werden.It makes sense that the digital control between backlight, display and image data is taken over by a powerful controller, preferably by a PC. Conversely, the display can also be used as a PC monitor.
Ein derart aufgebautes Display kann ein Bindeglied zwischen unserer digitalen und analogen Bilddarstellung werden. Es ist sowohl als reiner PC als auch als einfaches digitales Fernsehempfangsgerät zu verkaufen.A display constructed in this way can become a link between our digital and analog image display. It can be sold both as a pure PC and as a simple digital television receiver.
Eine besonders interessante Anwendung wäre die Darstellung hochaufgelöster Bild- und Schriftinformationen, wie sie typischerweise durch Zeitschriften und Tageszeitungen publiziert werden. Wie schon oben erwähnt, sind sämtliche technische Voraussetzungen zur Projektion und Speicherung zur Information durch den PC vorhanden. Nutzt man die Verbreitung von Daten über TV-Kanäle, so hat man ein kostengünstiges Transportmittel für die riesigen Datenfluten. Der Anwender benötigt nur noch ein TV-Empfangsteil in seinem Basisgerät. Die Daten könnten zu tarifgünstigen Zeiten (z. B. Nachts) gesendet und über spezielle digitale Codes verschlüsselt sein. Für die zu jeder gewünschten Zeit möglichen Decodierung benötigt der Anwender einen Softwareschlüssel, der auf einer Scheckkarte gespeichert ist, oder man erhält seinen Schlüssel digital via Telefonnetz. Die Gebühren für die Nutzung der Informationen können dann, je nach System, entweder beim Kauf der Software-Scheckkarten oder direkt über die Telefonrechnung abgebucht werden. Möglich wäre auch eine Verbindung von bereits gebräuchlichen Kreditkarten und Softwareschlüssel, so daß der Anwender, wie gewohnt, per electronic cash die Gebühren begleichen kann. Auf dem oben beschriebenen Wege ist es möglich, einer breiten Bevölkerungsschicht riesige Datenmengen zugänglich zu machen. Die Infrastruktur wie TV- Kanäle, Satelliten, Telefonnetze etc. sind weltweit flächendeckend vorhanden.A particularly interesting application would be the display of high-resolution image and font information, as is typically published by magazines and daily newspapers. As already mentioned above, all technical requirements for projection and storage for information by the PC are available. If you use the distribution of data via TV channels, you have an inexpensive means of transport for the huge flood of data. The user only needs a TV receiver in his base unit. The data could be sent at tariff-favorable times (e.g. at night) and encrypted using special digital codes. For the decoding that is possible at any desired time, the user needs a software key that is stored on a check card, or one receives his key digitally via the telephone network. Depending on the system, the fees for using the information can then be debited either when purchasing the software credit cards or directly via the telephone bill. It would also be possible to connect existing credit cards and software keys, so that the user can, as usual, pay the fees by electronic cash. In the way described above, it is possible to make huge amounts of data accessible to a broad section of the population. The infrastructure such as TV channels, satellites, telephone networks etc. are available all over the world.
Besonders sinnvoll wird die Anwendung, wenn man das erfindungsgemäße Farbdisplay als Basis fiir ein Projektionsgerät benutzt. Die kompakte, leistungsstarke Diodenbeleuchtung ermöglicht es, mit einem sehr hohen Wirkungsgrad eine qualitativ hochwertige Hintergrundbeleuchtung zu realisieren. Schwachpunkte solcher Diodenbeleuchtungen waren bislang die blauen Dioden. Seitdem es 5A-N-Dioden mit 100 facher Lichtausbeute im Vergleich zu SIC-Leuchtdioden gibt, ist dieser Nachteil behoben. Somit ist es möglich, eine Standardhintergrundbeleuchtung mit zehnfacher Lebensdauer und einer Energieeinsparung von 75% im Vergleich zu herkömmlichen Beleuchtungen herzustellen.The application is particularly useful if the color display according to the invention is used as the basis for a projection device. The compact, high-performance diode lighting enables high-quality background lighting to be achieved with a very high degree of efficiency. Weak points of such diode lighting have so far been the blue diodes. This disadvantage has been eliminated since there were 5A-N diodes with 100 times the luminous efficacy compared to SIC LEDs. It is therefore possible to produce a standard backlight with ten times the lifespan and an energy saving of 75% compared to conventional lighting.
Die Hintergrundbeleuchtung eignet sich natürlich auch für das von Texas Instruments entwickelte Projektionssystem basierend auf digitalen Mikrospiegeln DMD. Hierbei werden die einzelnen Mikrospiegel, ähnlich einer LCD-Zelle getaktet. Die lokalen Intensitätsschwankungen würden hier durch unterschiedliche Umklappzeiten der Spiegel kompensiert.The backlight is of course also suitable for the projection system based on digital micromirrors DMD developed by Texas Instruments. The individual micromirrors are clocked here, similar to an LCD cell. The local intensity fluctuations would be compensated for here by different flip times of the mirrors.
Allgemein gilt, daß die Hintergrundbeleuchtung möglichst homogen bezüglich der drei Grundfarben aufgebaut sein muß. Dieses kann zum Beispiel durch flache SMD-Dioden geschehen, die in einem signifikanten Muster in Abhängigkeit der Farbintensität und der Abstrahlwinkel der drei Grundfarben rot, blau und grün angeordnet sind. Hierbei gilt zur Zeit das Verhältnis :In general, the background lighting must be as homogeneous as possible with regard to the three primary colors. This can be done, for example, by means of flat SMD diodes, which are arranged in a significant pattern depending on the color intensity and the radiation angle of the three primary colors red, blue and green. The ratio currently applies:
6 rote Dioden = 1 blaue Diode = 24 grüne Dioden.6 red diodes = 1 blue diode = 24 green diodes.
In Abhängigkeit der technischen Weiterentwicklung kann sich dieses Verhältnis natürlich verschieben. Somit ist es durchaus möglich, flache Hintergrundbeleuchtungen für Laptops aufzubauen; die Einbautiefe entspricht dabei nicht mehr als 20 bis 40 [mm] . Depending on the technical development, this ratio can of course shift. It is therefore entirely possible to set up flat backlights for laptops; the installation depth does not correspond to more than 20 to 40 [mm].
Im folgenden Teil wird das erfindungsgemäße Verfahren dargestellt:The method according to the invention is shown in the following part:
Figur 1 : Schematische Darstellung des Displays mit ProjektionsanwendungFigure 1: Schematic representation of the display with projection application
Figur 2: Schematische Darstellung einer Anwendung des DisplaysFigure 2: Schematic representation of an application of the display
In Figur 1 wird das erfindungsgemäße Display schematisch dargestellt. Die drei Grundfarben blau (1), grün (2) und rot (3) hinterleuchten das Monochromdisplay (4, 9). Der Microcontroller (7), vorzugsweise ein PC, synchronisiert die Beleuchtung mit dem Display (4, 9) und den einzelnen LCD-Pixeln. Die Bilddaten werden über ein TV-Modul (8) geliefert, das aus einem Empfangsteil und einem Framegrabber besteht, so daß über einen schnellen Datenbus, vorzugsweise PCI, die digitalen Bilddaten zum Microcontroller gelangen. Über ein optisches Linsensystem (5) kann das Bild vom Farbdisplay auf beliebig große Projektionswände (6) vergrößert werden.In Figure 1, the display according to the invention is shown schematically. The three primary colors blue (1), green (2) and red (3) backlight the monochrome display (4, 9). The microcontroller (7), preferably a PC, synchronizes the lighting with the display (4, 9) and the individual LCD pixels. The image data are supplied via a TV module (8), which consists of a receiving part and a frame grabber, so that the digital image data is sent to the microcontroller via a fast data bus, preferably PCI. The image from the color display can be enlarged onto projection screens (6) of any size using an optical lens system (5).
In Figur 2 wird schematisch dargestellt, wie die gebührenpflichtigen Daten abgerechnet werden. Das Display (9) mit Controller verfugt über ein TV-Empfangsteil (10) und einen Telefonanschluß (12) sowie über einen Telefonkartenleser (11) oder ähnliche Paykartensysteme. Derartig ausgestattet können beliebige Datenmengen über TV-Kanäle übermittelt werden und vom Kunden selektiv und zeitunabhängig gespeichert und wieder abgerufen werden können. Eine Anwendung wäre z. B. die Verbreitung regionaler Tageszeitungen.FIG. 2 shows schematically how the fee-based data are billed. The display (9) with controller has a TV receiver (10) and a telephone connection (12) as well as a telephone card reader (11) or similar pay card systems. Equipped in this way, any amount of data can be transmitted via TV channels and can be selectively and independently saved and retrieved by the customer. One application would be e.g. B. the distribution of regional daily newspapers.
Zusammenfassend bleibt zu sagen, daß das erfindungsgemäße Display überall in technischen Geräten Einsatz finden kann. Es stellt nicht nur einen hohen Gebrauchswert durch seine qualitativ hochwertigen optische Bilder dar, sondern ist auch aus energiepolitischer und volkswirtschaftlicher Sicht von großem Nutzen. Berücksichtigt man, daß die Lebensdauer einer Diodenbeleuchtung 10 mal so groß ist wie eine Standard-Glühfadenbeleuchtung bei gleichzeitig 75% Energieersparnis, so lassen sich bei flächendeckendem Einsatz der Erfindung als TV-Gerät leicht ein bis zwei Kern- oder Kohlekraftwerke mit einer Leistung von drei bis fünf Gigawatt einsparen. In summary, it can be said that the display according to the invention can be used anywhere in technical devices. Not only does it represent a high utility value due to its high quality optical images, it is also of great benefit from an energy policy and economic perspective. If one takes into account that the lifespan of diode lighting is 10 times as long as standard filament lighting with 75% energy savings at the same time, one or two nuclear or coal-fired power plants with an output of three to can easily be used with the invention as a TV device save five gigawatts.

Claims

Patentansprüche claims
1. Farbdisplay und Anwendungen, bestehend aus roten, grünen und blauen Leuchtdioden, einem oder mehreren Microcontrollern, Objektiven und einem LC-Display, dadurch gekennzeichnet, daß das Monochromdisplay (4, 9) mit grünem (1), blauen (2) und rotem (3) Licht hinterleuchtet wird und daß zur Erzeugung eines Bildes jeweils die Rot-, Blau- und Grünanteile des Lichtes hintereinander erzeugt werden, und daß das LC-Display (4, 9) mit einer höheren Taktfrequenz arbeitet als die einzelnen Lichtquellen.1. Color display and applications, consisting of red, green and blue LEDs, one or more microcontrollers, lenses and an LC display, characterized in that the monochrome display (4, 9) with green (1), blue (2) and red (3) light is backlit and that the red, blue and green portions of the light are generated one after the other to produce an image, and that the LC display (4, 9) operates at a higher clock frequency than the individual light sources.
2. Farbdisplay und Anwendungen, bestehend aus roten, grünen und blauen Leuchtdioden, einem oder mehreren Microcontrollern, Objektiven und einem LC-Display nach Anspruch 1, dadurch gekennzeichnet, daß die Hintergrundbeleuchtung (1, 2, 3) aus LEDs besteht, die über Pulsweitenmodu-lation angesteuert werden.2. Color display and applications, consisting of red, green and blue light-emitting diodes, one or more microcontrollers, lenses and an LC display according to claim 1, characterized in that the backlight (1, 2, 3) consists of LEDs which have pulse width mod -lation can be controlled.
3. Farbdisplay und Anwendungen, bestehend aus roten, grünen und blauen Leuchtdioden, einem oder mehreren Microcontrollern, Objektiven und einem LC-Display nach Anspruch 1 und 2, dadurch gekennzeichnet, daß das Display aus PDCL- Streuzellen besteht.3. Color display and applications consisting of red, green and blue LEDs, one or more microcontrollers, lenses and an LC display according to claim 1 and 2, characterized in that the display consists of PDCL scatter cells.
4. Farbdisplay und Anwendungen, bestehend aus roten, grünen und blauen Leuchtdioden, einem oder mehreren Microcontrollern, Objektiven und einem LC-Display nach Anspruch 1, 2 und 3, dadurch gekennzeichnet, daß die Grauwerte des Monochrom-Displays einerseits die Farbintensität pro Pixel steuern, andererseits aber auch zum Ausgleich für Beleuchtungsinhomogenitäten dienen.4. Color display and applications, consisting of red, green and blue light-emitting diodes, one or more microcontrollers, lenses and an LC display according to claim 1, 2 and 3, characterized in that the gray values of the monochrome display on the one hand control the color intensity per pixel , but also serve to compensate for lighting inhomogeneities.
5. Farbdisplay und Anwendungen, bestehend aus roten, grünen und blauen Leuchtdioden, einem oder mehreren Microcontrollern, Objektiven und einem LC-Display nach Anspruch 1, 2, 3 und 4, dadurch gekennzeichnet, daß die genannten Steuerungen von Microcontrollern ausgeführt werden - vorzugsweise von einem PC (7).5. Color display and applications, consisting of red, green and blue light-emitting diodes, one or more microcontrollers, lenses and an LC display according to claim 1, 2, 3 and 4, characterized in that the controls mentioned are carried out by microcontrollers - preferably by a PC (7).
6. Anwendungen des erfindungsgemäßen Farbdisplays, aufgebaut aus einem Monochrom-LC- Display (4, 9) mit dreifarbiger LED Hintergrundbeleuchtung nach Anspruch 1, 2, 3, 4 und 5, dadurch gekennzeichnet, daß das LC-Farbdisplay (4, 9) über ein TV-Empfangsteil (10) verfugt, einen Telefonanschluß (12) und einen Kartenleser (11) aufweist, mittels einer Soft- und Hardwarelösung Freischaltungen von Informationen ermöglicht.6. Applications of the color display according to the invention, constructed from a monochrome LC display (4, 9) with three-color LED backlighting according to claim 1, 2, 3, 4 and 5, characterized in that the LC color display (4, 9) a TV receiver (10) has, has a telephone connection (12) and a card reader (11) which enables information to be activated by means of a software and hardware solution.
7. Anwendungen des erfindungsgemäßen Farbdisplays nach Anspruch 1, 2, 3, 4, 5 und 6, dadurch gekennzeichnet, daß das LC-Farbdisplay (4, 9) mit geeigneten Linsensystemen (5) als Projektionsmonitor (13) genutzt werden kann.7. Applications of the color display according to the invention according to claim 1, 2, 3, 4, 5 and 6, characterized in that the LC color display (4, 9) with suitable lens systems (5) can be used as a projection monitor (13).
8. Farbdisplay und Anwendungen, bestehend aus roten, grünen und blauen Leuchtdioden, einem oder mehreren Microcontrollern, Objektiven und einem LC-Display nach Anspruch 2, 5, 6, und 7, dadurch gekennzeichnet, daß das Monochrom-Display aus digitalen Mikrospiegeln oder aus anderen optischen oder mechanischen Mikroblenden aufgebaut ist. 8. Color display and applications, consisting of red, green and blue light-emitting diodes, one or more microcontrollers, lenses and an LC display according to claim 2, 5, 6 and 7, characterized in that the monochrome display made of digital micromirrors or other optical or mechanical microblends is constructed.
PCT/DE1997/001080 1996-05-31 1997-05-30 Colour display and uses of such a display WO1997045826A1 (en)

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DE19621911A DE19621911C2 (en) 1996-05-31 1996-05-31 Color display and applications
DE19627729A DE19627729A1 (en) 1996-05-31 1996-07-10 Color display, made up of a monochrome display with tri-color LED backlighting
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EP0976123A1 (en) 2000-02-02
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AU3253197A (en) 1998-01-05
DE19621911A1 (en) 1997-12-11

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