WO1995034088A1 - Crt display unit - Google Patents

Crt display unit Download PDF

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Publication number
WO1995034088A1
WO1995034088A1 PCT/DE1995/000701 DE9500701W WO9534088A1 WO 1995034088 A1 WO1995034088 A1 WO 1995034088A1 DE 9500701 W DE9500701 W DE 9500701W WO 9534088 A1 WO9534088 A1 WO 9534088A1
Authority
WO
WIPO (PCT)
Prior art keywords
display unit
electrochromic
arrangement according
image
brightness
Prior art date
Application number
PCT/DE1995/000701
Other languages
German (de)
French (fr)
Inventor
Wolfgang Eckhardt
Original Assignee
Siemens Aktiengesellschaft
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO1995034088A1 publication Critical patent/WO1995034088A1/en

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/86—Vessels; Containers; Vacuum locks
    • H01J29/89—Optical or photographic arrangements structurally combined or co-operating with the vessel
    • H01J29/896—Anti-reflection means, e.g. eliminating glare due to ambient light
    • 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 
    • G02F1/15—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 an electrochromic effect
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/89—Optical components associated with the vessel
    • H01J2229/8913—Anti-reflection, anti-glare, viewing angle and contrast improving treatments or devices
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/89—Optical components associated with the vessel
    • H01J2229/8926—Active components, e.g. LCD's, indicators, illuminators and moving devices

Definitions

  • the invention relates to an arrangement with a display unit for displaying an image.
  • gray filter glass is usually used for the piston crowns of image tubes.
  • the filter glass reduces both a brightening of dark areas of the image caused by the rays reflected in the interior of the tube and a heating up of these areas caused by room lighting.
  • the filter glass weakens the room light on its way there and back twice, the (desired) light generated by the beam current, however, only once.
  • the contrast is optimal due to the lack of ambient light. There, however, it makes sense to dispense with the filter glass and to use clear glass instead, because the filter glass also weakens the (desired) light which arises on the luminescent layer of the piston head.
  • the attenuation of light in tubes with filter glass can be compensated for by a larger beam current, but this has a disadvantageous effect on the image sharpness.
  • the present invention has for its object to provide an arrangement with a display unit of the type mentioned with a good contrast independent of the ambient light.
  • an electrochromic means is arranged in the image area of the display unit, the light transmission of which can be set as a function of the ambient brightness via control means.
  • the light transmittance of so-called electrochromic glasses eg made of tungsten trioxide
  • electrochromic glasses can be influenced by an electrical voltage on an electrochromic layer of the glass. This allows on the one hand in dark rooms the light transmission z. B. increase a cathode ray tube in order to achieve high image sharpness (resolution) with a set contrast, and on the other hand reduce the light transmission in bright rooms in order to leave this set contrast substantially unchanged with reduced image sharpness.
  • An electrochro e device is known from the product sheet "ECD Light Modulator” from Nikon. Two electrodes for applying a voltage are provided between two glass panes, an electrochromic layer between the
  • Electrodes is arranged. Depending on the voltage, the light transmittance of the device can be controlled.
  • the electrochromic agent is preferably part of the piston crown of a picture tube.
  • the electrochromic means can be arranged on the piston crown outside the glass bulb.
  • a monitor with an arrangement according to the invention is provided with a brightness sensor which detects the ambient brightness and feeds it to a control unit.
  • the control unit controls the voltage on the electrochromic means, whereby the light transmittance is changed in such a way that the set image contrast remains largely constant.
  • the threshold value is stored in a memory of the control unit.
  • the degree of brightness increases, e.g. B. due to solar radiation, the control unit reduces the translucency of the piston head, whereby the image contrast remains largely unchanged despite changing light conditions in the vicinity of the monitor. Accordingly, the control unit increases the translucency of the piston crown, if the stored threshold is undershot.
  • the display unit can be designed as a so-called Fiat Panel Display. In an arrangement with a Fiat panel
  • Display can be reduced by the adjustable light transmission of the electrochromic means, the current consumption of the background lamp of the Fiat Panel Display.
  • the figure shows components of a monitor in a simplified representation.
  • With 1 is a glass bulb of a picture tube with a base 2 for connection to an electronic circuit, for. B. on a video amplifier, referred to, in the tube neck an electron source 3 and a bundle device 4 is arranged.
  • the electron source 3 sends an electron beam in the direction of a luminescent layer 5 of a glass pane 6 of the glass bulb 1, the bundling device 4 concentrating the electron beam, which is deflected in the horizontal and vertical directions by deflection coils (not shown here).
  • the electrons of the electron beam penetrate a conductive layer 7, e.g. B. made of aluminum, on the piston crown, stimulate the luminescent layer 5 to light up and are finally derived via the conductive layer 7 on the funnel-shaped part of the glass bulb 1 to an anode connection 8.
  • the remaining electrons reach the luminous layer 5, as a result of which a luminous spot 9 is formed on this layer.
  • the first glass pane 6 with the luminous layer 5, a second glass pane 10 and an electrochromic layer 13 arranged between the panes 6, 10 and provided with two electrodes 11, 12 are components of the piston crown.
  • a control unit 14 supplies the electrodes 11, 12 with a voltage via lines 15, with which the control unit 14 controls the light transmission of the electrochromic layer 13 and thus of the piston crown.
  • a control table is stored in a memory of the control unit 14 (not shown here), which is operated by the control unit 14 with a suitable control program during monitor operation.
  • the control table comprises several brightness level threshold ranges with assigned control voltages.
  • a brightness sensor 16 detects the degree of brightness in the area in front of the piston head of the monitor, which the sensor 16 indicates to the control unit 14.
  • the control unit 14 checks in which threshold value range the detected degree of brightness lies, and supplies the electrochromic layer 13 with a voltage associated with the determined range via the electrodes 11, 12.
  • the piston crown changes its light transmission in accordance with this voltage.

Abstract

The invention concerns a cathode ray tube image-display unit. Disposed in the screen region of the display unit is an electrochromic agent whose transmittance can be adjusted by control means as a function of the ambient-light level so that the contrast of the image on the screen is good both in light and in dark rooms. The invention is intended for use in the field of imaging technology.

Description

Beschreibungdescription
Anordnung mit einer AnzeigeeinheitArrangement with a display unit
Die Erfindung betrifft eine Anordnung mit einer Anzeige¬ einheit zur Darstellung eines Bildes.The invention relates to an arrangement with a display unit for displaying an image.
Um in hellen Räumen den Kontrast eines auf einem mit einer Kathodenstrahlröhre versehenen Monitor dargestellten Bildes zu verbessern, verwendet man gewöhnlich für die Kolbenböden von Bildröhren graues Filterglas. Das Filterglas vermindert sowohl eine durch die im Innern der Röhre reflektierten Strahlen verursachte Aufhellung von dunklen Stellen des Bil¬ des als auch eine durch die Raumbeleuchtung bewirkte Aufhei- lung dieser Stellen. Das Filterglas schwächt dabei das Raum¬ licht auf dessen Hin- und Rückweg zweimal, das durch den Strahlstrom erzeugte (gewünschte) Licht dagegen nur einmal.In order to improve the contrast of an image displayed on a monitor provided with a cathode ray tube in bright rooms, gray filter glass is usually used for the piston crowns of image tubes. The filter glass reduces both a brightening of dark areas of the image caused by the rays reflected in the interior of the tube and a heating up of these areas caused by room lighting. The filter glass weakens the room light on its way there and back twice, the (desired) light generated by the beam current, however, only once.
In gut abgedunkelten Räumen ist der Kontrast wegen des feh- lenden Umgebungslichtes optimal. Dort ist es allerdings sinn¬ voll, auf das Filterglas zu verzichten und statt dessen Klar¬ glas einzusetzen, weil das Filterglas auch das auf der Leuchtschicht des Kolbenbodens entstehende (gewünschte) Licht schwächt. Die LichtSchwächung kann man zwar in Röhren mit Filterglas durch einen größeren Strahlstrom ausgleichen, dies wirkt sich allerdings nachteilig auf die Bildschärfe aus.In well darkened rooms, the contrast is optimal due to the lack of ambient light. There, however, it makes sense to dispense with the filter glass and to use clear glass instead, because the filter glass also weakens the (desired) light which arises on the luminescent layer of the piston head. The attenuation of light in tubes with filter glass can be compensated for by a larger beam current, but this has a disadvantageous effect on the image sharpness.
Der vorliegenden Erfindung liegt die Aufgabe zugrunde, eine Anordnung mit einer Anzeigeeinheit der eingangs genannten Art mit einem vom Umgebungslicht unabhängigen guten Kontrast an¬ zugeben.The present invention has for its object to provide an arrangement with a display unit of the type mentioned with a good contrast independent of the ambient light.
Diese Aufgabe wird in einer Anordnung der eingangs genannten Art dadurch gelöst, daß im Bildbereich der Anzeigeeinheit ein elektrochromes Mittel angeordnet ist, dessen Lichtdurchläs¬ sigkeit in Abhängigkeit der Umgebungshelligkeit über Steuer¬ mittel einstellbar ist. Die Lichtdurchlässigkeit von sogenannten elektrochromen Glä¬ sern (z. B. aus Wolframtrioxyd) läßt sich durch eine elek¬ trische Spannung an einer elektrochromen Schicht des Glases beeinflussen. Dadurch läßt sich einerseits in dunklen Räumen die Lichtdurchlässigkeit z. B. einer Kathodenstrahlröhre er¬ höhen, um eine hohe Bildschärfe (Auflösung) bei einem einge¬ stellten Kontrast zu erzielen, und andererseits in hellen Räumen die Lichtdurchlässigkeit vermindern, um diesen einge¬ stellten Kontrast bei verminderter Bildschärfe im wesent- liehen unverändert zu lassen.This object is achieved in an arrangement of the type mentioned at the outset in that an electrochromic means is arranged in the image area of the display unit, the light transmission of which can be set as a function of the ambient brightness via control means. The light transmittance of so-called electrochromic glasses (eg made of tungsten trioxide) can be influenced by an electrical voltage on an electrochromic layer of the glass. This allows on the one hand in dark rooms the light transmission z. B. increase a cathode ray tube in order to achieve high image sharpness (resolution) with a set contrast, and on the other hand reduce the light transmission in bright rooms in order to leave this set contrast substantially unchanged with reduced image sharpness.
Eine elektrochro e Vorrichtung ist aus dem Produktblatt "ECD Light Modulator" der Firma Nikon bekannt. Zwischen zwei Glas¬ scheiben sind dort zwei Elektroden zum Anlegen einer Spannung vorgesehen, wobei eine elektrochrome Schicht zwischen denAn electrochro e device is known from the product sheet "ECD Light Modulator" from Nikon. Two electrodes for applying a voltage are provided between two glass panes, an electrochromic layer between the
Elektroden angeordnet ist. In Abhängigkeit der Spannung läßt sich die Lichtdurchlässigkeit der Vorrichtung steuern.Electrodes is arranged. Depending on the voltage, the light transmittance of the device can be controlled.
Vorzugsweise ist das elektrochrome Mittel Bestandteil des Kolbenbodens einer Bildröhre. Um allerdings Bildröhren nach- zurüsten, kann das elektrochrome Mittel am Kolbenboden außer¬ halb des Glaskolbens angeordnet werden.The electrochromic agent is preferably part of the piston crown of a picture tube. However, in order to retrofit picture tubes, the electrochromic means can be arranged on the piston crown outside the glass bulb.
Ein Monitor mit einer Anordnung gemäß der Erfindung ist mit einem Helligkeitssensor versehen, welcher die Umgebungshel- ligkeit erfaßt und einer Steuereinheit zuführt. In Abhängig¬ keit der erfaßten Helligkeit und eines durch einen Bediener voreingestellten Helligkeitsgradschwellwertes steuert die Steuereinheit die Spannung an dem elektrochromen Mittel, wo¬ bei die Lichtdurchlässigkeit derart verändert wird, daß der eingestellte Bildkontrast weitgehend konstant bleibt. Dazu ist der Schwellwert in einem Speicher der Steuereinheit hin¬ terlegt. Erhöht sich der Helligkeitsgrad, z. B. aufgrund von Sonneneinstrahlung, verringert die Steuereinheit die Licht- durchlässigkeit des Kolbenbodens, wodurch der Bildkontrast trotz wechselnder Lichtverhältnisse in der Umgebung des Moni¬ tors weitgehend unverändert bleibt. Entsprechend erhöht die Steuereinheit die Lichtdurchlässigkeit des Kolbenbodens, falls der gespeicherte Schwellwert unterschritten wird. Es ist selbstverständlich möglich, mehrere Schwellwerte bzw. Schwellwertbereiche vorzugeben, um die Lichtdurchlässigkeit der Bildröhre nach Maßgabe der durch den Helligkeitssensor erfaßten Helligkeitsgrade stufenweise zu verändern. Durch ei¬ ne geeignete Wahl der Abstufung wird unabhängig von der Umge¬ bungshelligkeit ein konstanter Bildkontrast erzielt.A monitor with an arrangement according to the invention is provided with a brightness sensor which detects the ambient brightness and feeds it to a control unit. Depending on the detected brightness and a brightness level threshold value preset by an operator, the control unit controls the voltage on the electrochromic means, whereby the light transmittance is changed in such a way that the set image contrast remains largely constant. For this purpose, the threshold value is stored in a memory of the control unit. The degree of brightness increases, e.g. B. due to solar radiation, the control unit reduces the translucency of the piston head, whereby the image contrast remains largely unchanged despite changing light conditions in the vicinity of the monitor. Accordingly, the control unit increases the translucency of the piston crown, if the stored threshold is undershot. It is of course possible to specify a plurality of threshold values or threshold value ranges in order to gradually change the light transmission of the picture tube in accordance with the brightness levels detected by the brightness sensor. Through a suitable choice of gradation, a constant image contrast is achieved regardless of the ambient brightness.
Die Anzeigeeinheit kann als sogenanntes Fiat Panel Display ausgebildet sein. In einer Anordnung mit einem Fiat PanelThe display unit can be designed as a so-called Fiat Panel Display. In an arrangement with a Fiat panel
Display kann durch die einstellbare Lichtdurchlässigkeit des elektrochromen Mittels die Stromaufnahme der Hintergrundlampe des Fiat Panel Display reduziert werden.Display can be reduced by the adjustable light transmission of the electrochromic means, the current consumption of the background lamp of the Fiat Panel Display.
Anhand eines in der Zeichnung dargestellten Ausführungsbei- spiels werden die Erfindung, deren Ausgestaltungen sowie Vor¬ teile näher erläutert.The invention, its configurations and advantages are explained in more detail with reference to an exemplary embodiment shown in the drawing.
Die Figur zeigt Bestandteile eines Monitors in einer verein- fachten Darstellung.The figure shows components of a monitor in a simplified representation.
Mit 1 ist ein Glaskolben einer Bildröhre mit einem Sockel 2 zum Anschluß an eine elektronische Schaltung, z. B. an einen Videoverstärker, bezeichnet, in dessen Röhrenhals eine Elek- tronenquelle 3 und eine Bündeleinrichtung 4 angeordnet ist. Die Elektronenquelle 3 sendet einen Elektronenstrahl in Rich¬ tung einer LeuchtSchicht 5 einer Glasscheibe 6 des Glas¬ kolbens 1, wobei die Bündeleinrichtung 4 den Elektronenstrahl konzentriert, welcher durch hier nicht dargestellte Ablenk- spulen in horizontaler und vertikaler Richtung abgelenkt wird. Die Elektronen des Elektronenstrahls durchdringen eine leitende Schicht 7, z. B. aus Aluminium, am Kolbenboden, re¬ gen die Leuchtschicht 5 zum Leuchten an und werden schlie߬ lich über die leitende Schicht 7 am trichterförmigen Teil des Glaskolbens 1 zu einem Anodenanschluß 8 abgeleitet. Die rest¬ lichen Elektronen erreichen die Leuchtschicht 5, wodurch auf dieser Schicht ein Leuchtfleck 9 entsteht. Die erste Glasscheibe 6 mit der Leuchtschicht 5, eine zweite Glasscheibe 10 und eine zwischen den Scheiben 6, 10 angeord¬ nete, mit zwei Elektroden 11, 12 versehene elektrochrome Schicht 13 sind Bestandteile des Kolbenbodens. Eine Steuer- einheit 14 führt den Elektroden 11, 12 über Leitungen 15 eine Spannung zu, mit welcher die Steuereinheit 14 die Lichtdurch¬ lässigkeit der elektrochromen Schicht 13 und somit des Kol- benbodens steuert. Um den Bildkontrast unabhängig von dem Umgebungslicht der Röhre weitgehend konstant zu halten, ist in einem hier nicht dargestellten Speicher der Steuereinheit 14 eine Steuer¬ tabelle hinterlegt, welche während des Monitorbetriebs durch die Steuereinheit 14 mit einem geeigneten Steuerprogramm be¬ arbeitet wird. Die Steuertabelle umfaßt mehrere Helligkeits- gradschwellwertbereiche mit zugeordneten SteuerSpannungen. Ein Helligkeitssensor 16 erfaßt den Helligkeitsgrad im Be¬ reich vor dem Kolbenboden des Monitors, welchen der Sensor 16 der Steuereinheit 14 anzeigt. Die Steuereinheit 14 prüft, in welchem Schwellwertbereich der erfaßte Helligkeitsgrad liegt, und führt der elektrochromen Schicht 13 über die Elektroden 11, 12 eine dem ermittelten Bereich zugeordnete Spannung zu. Entsprechend dieser Spannung verändert der Kolbenboden seine Lichtdurchlässigkeit. With 1 is a glass bulb of a picture tube with a base 2 for connection to an electronic circuit, for. B. on a video amplifier, referred to, in the tube neck an electron source 3 and a bundle device 4 is arranged. The electron source 3 sends an electron beam in the direction of a luminescent layer 5 of a glass pane 6 of the glass bulb 1, the bundling device 4 concentrating the electron beam, which is deflected in the horizontal and vertical directions by deflection coils (not shown here). The electrons of the electron beam penetrate a conductive layer 7, e.g. B. made of aluminum, on the piston crown, stimulate the luminescent layer 5 to light up and are finally derived via the conductive layer 7 on the funnel-shaped part of the glass bulb 1 to an anode connection 8. The remaining electrons reach the luminous layer 5, as a result of which a luminous spot 9 is formed on this layer. The first glass pane 6 with the luminous layer 5, a second glass pane 10 and an electrochromic layer 13 arranged between the panes 6, 10 and provided with two electrodes 11, 12 are components of the piston crown. A control unit 14 supplies the electrodes 11, 12 with a voltage via lines 15, with which the control unit 14 controls the light transmission of the electrochromic layer 13 and thus of the piston crown. In order to keep the image contrast largely constant regardless of the ambient light of the tube, a control table is stored in a memory of the control unit 14 (not shown here), which is operated by the control unit 14 with a suitable control program during monitor operation. The control table comprises several brightness level threshold ranges with assigned control voltages. A brightness sensor 16 detects the degree of brightness in the area in front of the piston head of the monitor, which the sensor 16 indicates to the control unit 14. The control unit 14 checks in which threshold value range the detected degree of brightness lies, and supplies the electrochromic layer 13 with a voltage associated with the determined range via the electrodes 11, 12. The piston crown changes its light transmission in accordance with this voltage.

Claims

Patentansprüche Claims
1. Anordung mit einer Anzeigeeinheit zur Darstellung eines Bildes, dadurch gekennzeichnet, daß im Bildbereich der Anzeigeeinheit ein elektrochromes Mittel (11, 12, 13) angeordnet ist, dessen Lichtdurchlässigkeit in Abhängigkeit der Umgebungshelligkeit über Steuermittel (14, 15, 16) ein¬ stellbar ist.1. Arrangement with a display unit for displaying an image, characterized in that an electrochromic means (11, 12, 13) is arranged in the image area of the display unit, the light transmission depending on the ambient brightness via control means (14, 15, 16) adjustable is.
2. Anordnung nach Anspruch 1, dadurch gekennzeich¬ net , daß die Anzeigeeinheit eine Kathodenstrahlröhre mit einem Glaskolben (1) aufweist, wobei das elektrochrome Mittel (11, 12, 13) im Bereich des Kolbenbodens (5, 6, 10, 11, 12, 13) angeordnet ist.2. Arrangement according to claim 1, characterized gekennzeich¬ net that the display unit has a cathode ray tube with a glass bulb (1), the electrochromic means (11, 12, 13) in the region of the piston head (5, 6, 10, 11, 12th , 13) is arranged.
3. Anordnung nach Anspruch 2, dadurch gekennzeich¬ net, daß das elektrochrome Mittel (11, 12, 13) Bestandteil des Kolbenbodens (5, 6, 10, 11, 12, 13) ist.3. Arrangement according to claim 2, characterized gekennzeich¬ net that the electrochromic means (11, 12, 13) is part of the piston crown (5, 6, 10, 11, 12, 13).
4. Anordnung nach Anspruch 2, dadurch gekennzeich¬ net, daß das elektrochrome Mittel außerhalb des Glas¬ kolbens vor dem Röhrenboden angeordnet ist.4. Arrangement according to claim 2, characterized gekennzeich¬ net that the electrochromic agent is arranged outside the Glas¬ bulb in front of the tube sheet.
5. Anordnung nach Anspruch 1, dadurch gekennzeich- net , daß die Anzeigeeinheit ein Fiat Panel Display auf¬ weist.5. Arrangement according to claim 1, characterized in that the display unit has a Fiat panel display.
6. Monitor mit einer Anordnung nach einem der Ansprüche 1 bis 5, wobei das Steuermittel (14, 15, 16) aus einem Helligkeits- sensor (16) und einer mit diesem Sensor (16) verbundenen Steuereinheit (14) besteht.6. Monitor with an arrangement according to one of claims 1 to 5, wherein the control means (14, 15, 16) consists of a brightness sensor (16) and a control unit (14) connected to this sensor (16).
7. Monitor nach Anspruch 6, dadurch gekennzeich¬ net, daß die Steuereinheit (14) einen Speicher aufweist, in welchem eine Steuertabelle mit Helligkeitsgradschwellwert- bereichen und diesen Bereichen zugeordneten Steuerspannungen hinterlegt ist. 7. Monitor according to claim 6, characterized in that the control unit (14) has a memory in which a control table with brightness level threshold value ranges and control voltages assigned to these ranges is stored.
PCT/DE1995/000701 1994-06-09 1995-05-30 Crt display unit WO1995034088A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEG9409326.1U 1994-06-09
DE9409326U DE9409326U1 (en) 1994-06-09 1994-06-09 Arrangement with a display unit

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Publication Number Publication Date
WO1995034088A1 true WO1995034088A1 (en) 1995-12-14

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Cited By (3)

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Publication number Priority date Publication date Assignee Title
WO1999066696A1 (en) * 1998-06-17 1999-12-23 Telefonaktiebolaget Lm Ericsson Display for a portable device
US6144479A (en) * 1998-12-16 2000-11-07 3M Innovative Properties Company Low reflectivity contrast enhancement filter
US6285350B1 (en) 1997-11-22 2001-09-04 U.S. Philips Corporation Color correction

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JPS6332843A (en) * 1986-07-25 1988-02-12 Hitachi Ltd Cathode-ray tube
US5060075A (en) * 1989-12-22 1991-10-22 North American Philips Corporation CRT display device with variable light transmission panel
GB2258077A (en) * 1991-07-23 1993-01-27 Phillip Edwin Walker Display device.
FR2683655A1 (en) * 1991-11-12 1993-05-14 Thomson Csf Variable-contrast visual-display screen
JPH05142585A (en) * 1991-11-15 1993-06-11 Nippon Electric Glass Co Ltd Display panel

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5567729A (en) * 1978-11-15 1980-05-22 Sanyo Electric Co Ltd Control window body for transmission light quantity
DE3312362C1 (en) * 1983-04-06 1984-07-26 Standard Elektrik Lorenz Ag, 7000 Stuttgart Apparatus having a video screen and/or display of controllable brightness
JPS6332843A (en) * 1986-07-25 1988-02-12 Hitachi Ltd Cathode-ray tube
US5060075A (en) * 1989-12-22 1991-10-22 North American Philips Corporation CRT display device with variable light transmission panel
GB2258077A (en) * 1991-07-23 1993-01-27 Phillip Edwin Walker Display device.
FR2683655A1 (en) * 1991-11-12 1993-05-14 Thomson Csf Variable-contrast visual-display screen
JPH05142585A (en) * 1991-11-15 1993-06-11 Nippon Electric Glass Co Ltd Display panel

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Title
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PATENT ABSTRACTS OF JAPAN vol. 012, no. 244 (E - 631) 9 July 1988 (1988-07-09) *
PATENT ABSTRACTS OF JAPAN vol. 017, no. 526 (P - 1617) 21 September 1993 (1993-09-21) *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6285350B1 (en) 1997-11-22 2001-09-04 U.S. Philips Corporation Color correction
WO1999066696A1 (en) * 1998-06-17 1999-12-23 Telefonaktiebolaget Lm Ericsson Display for a portable device
US6349221B1 (en) 1998-06-17 2002-02-19 Telefonaktiebolaget Lm Ericsson (Publ) Display for a portable device
US6144479A (en) * 1998-12-16 2000-11-07 3M Innovative Properties Company Low reflectivity contrast enhancement filter

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