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WO2006092981A1 - Tube d’affichage fluorescent - Google Patents

Tube d’affichage fluorescent Download PDF

Info

Publication number
WO2006092981A1
WO2006092981A1 PCT/JP2006/303022 JP2006303022W WO2006092981A1 WO 2006092981 A1 WO2006092981 A1 WO 2006092981A1 JP 2006303022 W JP2006303022 W JP 2006303022W WO 2006092981 A1 WO2006092981 A1 WO 2006092981A1
Authority
WO
WIPO (PCT)
Prior art keywords
cathode
luminance
filament
voltage
electron emission
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2006/303022
Other languages
English (en)
Japanese (ja)
Inventor
Kazuhisa Kitaya
Kiyoshi Izumi
Akira Kawahara
Kazuhiko Hosaka
Noriaki Ae
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pioneer Corp
Original Assignee
Pioneer Corp
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 Pioneer Corp filed Critical Pioneer Corp
Priority to JP2007505854A priority Critical patent/JP4176139B2/ja
Publication of WO2006092981A1 publication Critical patent/WO2006092981A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J31/00—Cathode ray tubes; Electron beam tubes
    • H01J31/08—Cathode ray tubes; Electron beam tubes having a screen on or from which an image or pattern is formed, picked up, converted, or stored
    • H01J31/10—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes
    • H01J31/12—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes with luminescent screen
    • H01J31/123—Flat display tubes
    • H01J31/125—Flat display tubes provided with control means permitting the electron beam to reach selected parts of the screen, e.g. digital selection
    • H01J31/126—Flat display tubes provided with control means permitting the electron beam to reach selected parts of the screen, e.g. digital selection using line 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
    • G09G3/22—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 using controlled light sources
    • G09G3/24—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 using controlled light sources using incandescent filaments

Definitions

  • the present invention relates to a fluorescent display tube in which a light emitting surface having an anode and a phosphor and a filamentary cathode as an electron source are housed and arranged in an airtight container.
  • Fluorescent display tubes are often used as display devices for stereo devices and in-vehicle devices.
  • the fluorescent display tube includes an anode disposed in an airtight container, a light emitting surface having a phosphor on the anode surface, a filamentary cathode stretched inside the hermetic container, and an anode and a filamentous cathode inside the hermetic container. It consists of a grid installed in The filamentary cathode generates heat when it is energized by applying a voltage, and emits electrons at that time. The emitted electrons are attracted to the positive potential applied to the anode and the grid and collide with the light emitting surface. When electrons collide with the light emitting surface, the fluorescent display tube is displayed by emitting light from the collision part.
  • Patent Document 1 describes changing the luminance by changing the duty ratio of the voltage applied to the anode.
  • Patent Document 1 discloses a method of stopping power supply to a filamentary cathode in a portion where display is not performed during standby.
  • Patent Document 1 Japanese Patent Laid-Open No. 2001-22324
  • the luminance change is controlled on the anode side, and the filamentary cathode is always used with a constant voltage applied.
  • the filamentary cathode heated to a high temperature looks red, which may deteriorate the display quality.
  • the display location is limited, such as displaying only the clock when the device is on standby, the filamentary cathode at the location that is not displayed may stand out and cause display quality problems.
  • an object of the present invention is to provide a fluorescent display device in which, for example, lighting of a filament is suppressed to a level that does not cause a problem in display quality even at low luminance, and further, power consumption at low luminance is reduced. is there.
  • the invention of claim 1 includes an airtight container, an anode formed on an inner surface of the airtight container, a light emitting surface formed on the anode surface and having a phosphor, and is stretched in the airtight container. And a fluorescent display tube having a filamentary cathode to which a voltage is applied,
  • An electron emission amount changing means is provided for changing the electron emission amount of the filament cathode when changing the light emission luminance of the light emitting surface.
  • FIG. 1 is a plan view of a fluorescent display tube according to a first embodiment of the present invention.
  • FIG. 2 is a cross-sectional view taken along the line AA in FIG.
  • FIG. 3 is a plan view of a fluorescent display tube according to a second embodiment of the present invention.
  • FIG. 4 is a plan view of a fluorescent display tube using a transformer with a center tap according to a third embodiment of the present invention.
  • FIG. 5 is a plan view of a fluorescent display tube using a center-tapless transformer according to a third embodiment of the present invention.
  • FIG. 6 is a plan view of a fluorescent display tube according to a fourth embodiment of the present invention.
  • FIG. 7 is a waveform diagram showing a change in duty ratio at high luminance and low luminance in the fourth embodiment.
  • Duty ratio control unit Electric emission amount changing means, means for changing the ratio of time for applying voltage per unit time
  • a fluorescent display tube includes an airtight container, an anode formed on an inner surface of the airtight container, a light emitting surface formed on the anode surface and having a phosphor, and the airtight container.
  • An electron emission amount changing means for changing the electron emission amount of the filamentary cathode when changing the light emission luminance of the light emitting surface. Prepare. In this way, by changing the amount of electron emission from the filamentary cathode in accordance with the change in brightness, the current flowing through the filamentary cathode can be reduced at low brightness, so the temperature of the filamentous cathode decreases. However, the filamentary cathode emits red light. In addition, since the current flowing through the filament cathode is reduced, the power consumption of the fluorescent display tube can be reduced.
  • the filament cathode includes a high-luminance filament cathode having different electron emission amounts when the applied voltage is the same, and a low-luminance filament cathode
  • the electron emission amount changing means includes: And a switching means for applying a voltage to one of the high luminance filament cathode and the low luminance filament cathode and switching the filament cathode to be applied.
  • all the filamentary cathodes have the same amount of electron emission when the applied voltage is the same, and the electron emission amount changing means changes the voltage value applied to the filamentous cathode.
  • a voltage regulator for changing the electron emission amount may be provided.
  • all the filamentary cathodes have the same amount of electron emission when the applied voltage is the same, and the electron emission amount changing means applies a voltage per unit time to the filamentary cathode. There may be provided means for changing the ratio of the time to perform.
  • a fluorescent display tube 1 useful for the first embodiment of the present invention includes an airtight container 2, an anode 3 housed in the airtight container 2, and a light emitting surface 4.
  • the airtight container 2 is a container in which glass plates are assembled in a box shape and the inside is in a vacuum state, and the display surface is a transparent glass plate.
  • the anode 3 is a conductor electrode formed on a glass substrate facing the display surface of the hermetic container 2, and in this embodiment, rectangular electrodes are arranged at predetermined intervals.
  • the anodes 3 are electrically insulated from each other and connected to circuit wiring (not shown) formed on the glass substrate, and a voltage is applied through the circuit wiring.
  • the light emitting surface 4 is formed of a known phosphor on the surface of the anode 3 and emits light when electrons emitted from the filamentary cathode 5 and attracted to the anode 3 collide.
  • the filamentary cathode 5 is stretched in the hermetic container 2 so that a plurality of filament cathodes 5 are parallel to each other so as to overlap the light emitting surface 4 in the longitudinal direction of the hermetic container 2.
  • the filamentary cathode 5 is mainly coated with tungsten oxide wire such as barium, strontium, calcium, etc., and both ends are connected to the filament power supply 7 and energized by applying voltage to generate heat. To emit electrons.
  • the grid 8 is provided between the anode 3 and the filamentary cathode 5 in the hermetic container 2 and is formed by forming a conductive metal in a mesh shape.
  • the grid 8 is electrically insulated from the anode 3, and a voltage is applied through a circuit wiring (not shown) formed on the glass substrate.
  • the filamentous cathode 5 has two types of filamentous cathodes 5; a high-luminance filamentary cathode 5a and a low-luminance filamentary cathode 5b that emit different amounts of electrons when the same voltage is applied. Is provided.
  • the filamentary cathode 5a for high brightness and the filamentous cathode 5b for low brightness are alternately stretched in the airtight container 2 so as not to overlap each other.
  • the same voltage is applied to the filament cathode 5b for low brightness as the filament cathode 5a for high brightness. In this case, the current flowing is reduced, so that the temperature is lowered and the amount of emitted electrons is reduced.
  • the filament switching unit 6 is a switching switch that selects which of the high-luminance filament-like cathode 5a and the low-luminance filament-like cathode 5b is to be applied with a voltage. Switch manually.
  • the filament switching section 6 applies a voltage to one of the filament cathode 5a for high brightness and the filament cathode 5b for low brightness, and applies the voltage to the filament cathode 5a for low brightness and the filament cathode 5b for low brightness.
  • the amount of electron emission from the filamentary cathode 5 is changed by switching.
  • the filament power supply 7 is a power supply that applies a voltage for causing the filamentary negative electrode 5 to generate heat and emitting electrons, and is a DC power supply in this embodiment.
  • the filament switching unit 6 is switched so that the voltage of the filament power source 7 is applied to the high-luminance filament cathode 5a.
  • a positive potential is applied to anode 3 and grid 8 from a separate power source that can change the duty ratio (not shown), and the luminance of fluorescent display tube 1 is changed by changing the duty ratio.
  • the time during which voltage is applied to anode 3 and grid 8 per unit time is lengthened. That is, the luminance of the fluorescent display tube 1 is increased by setting the duty ratio of the voltage applied to the anode 3 and the grid 8 to be large.
  • the high-intensity filamentous cathode 5a When a voltage is applied to the high-intensity filamentary cathode 5a, the high-intensity filamentous cathode 5a is energized and generates heat. When the high-luminance filamentary cathode 5a generates heat, it begins to emit electrons. The emitted electrons are attracted to the grid 8 and the anode 3 to which a positive potential is applied. The light emitting surface 4 formed on the surface of the anode 3 emits light when electrons attracted to the anode 3 collide. The fluorescent display tube 1 is displayed by this light emission.
  • the high-luminance filamentary cathode 5a When a display is performed using the high-luminance filamentary cathode 5a, a large amount of current flows through the high-luminance filamentary cathode 5a in order to emit a large amount of electrons. As a result, the high-luminance filamentary cathode 5a itself emits red light. However, since the brightness of the fluorescent display tube 1 is increased, the filamentous cathode for high brightness 5 The light emission of a is rare. In addition, since the periphery of the fluorescent display tube 1 is bright, the light emission from the high-luminance filament cathode 5a is not noticeable.
  • the filament switching unit 6 is switched so that the voltage of the filament power supply 7 is applied to the low-luminance filament-like cathode 5b.
  • the time during which voltage is applied per unit time is shortened from another power source that can change the duty ratio (not shown) to the anode 3 and the grid 8. That is, the luminance of the fluorescent display tube 1 is lowered by setting the duty ratio of the voltage applied to the anode 3 and the grid 8 to be small.
  • the electrons emitted by the heat generation of the low-luminance filamentary cathode 5b are positive potentials. Is attracted to the grid 8 and anode 3 to which is applied.
  • the light emitting surface 4 formed on the surface of the anode 3 emits light when electrons attracted to the anode 3 collide.
  • the fluorescent display tube 1 is displayed by this light emission.
  • the amount of electron emission is reduced by reducing the current flowing from the high-brightness filamentous cathode 5a.
  • the amount of heat generation is also reduced, and the filament-like cathode 5b for low brightness becomes cold, so the light emission of the filament cathode 5b for low brightness is lower than that of the filament cathode 5a for high brightness.
  • the light emission is conspicuous.
  • the filament-like cathode 5a and the filament-like cathode 5b for low brightness are prepared for high brightness and low brightness, respectively, so that the filament cathode is used even at low brightness. 5 is less noticeable, and the current flowing through the filamentary cathode 5 is also reduced, so that the power consumption of the fluorescent display tube 1 at low brightness can be reduced.
  • the switch for manually switching the filament switching unit 6 is used as a switch, however, in conjunction with the duty ratio of the voltage value applied to the anode 3 and the grid 8 for changing the luminance.
  • the filamentous cathode 5a for high brightness and the filamentous cathode 5b for low brightness may be switched.
  • the filament power source 7 a power AC power source using a DC power source or a PWM power source may be used.
  • Example 2 Next, a second embodiment of the present invention will be described with reference to FIG.
  • the same parts as those in the first embodiment described above are denoted by the same reference numerals and description thereof is omitted.
  • all the filamentary cathodes 5 have the same amount of electron emission when the applied voltage is the same.
  • a DC voltage regulator 9 is provided as means for changing the amount of emitted electrons. The DC voltage regulator 9 changes the electron emission amount of the filament cathode 5 by changing the voltage value applied to both ends of the filament cathode 5.
  • the operation of this embodiment will be described.
  • the voltage value applied to both ends of the filamentary cathode 5 is changed. Change to lower.
  • the current flowing through the filamentous cathode 5 is reduced, the amount of electrons emitted is also reduced.
  • the filament-like cathode 5 becomes low temperature, and the light emission of the filament-like cathode 5 also decreases.
  • the present embodiment by changing the voltage value applied to the filamentary cathode 5, the light emission of the filamentous cathode 5 is less noticeable even at low brightness, and the current flowing through the filamentous cathode 5 is also reduced. Therefore, the power consumption of the fluorescent display tube 1 at low luminance can be reduced. Also, two types of filamentous cathodes 5 for high luminance and low luminance are prepared, and the configuration becomes simpler than switching them.
  • FIGS. 4 and 5 The same parts as those in the first embodiment described above are denoted by the same reference numerals and description thereof is omitted.
  • all filament-like cathodes 5 have the same amount of electron emission when the applied voltage is the same.
  • An AC voltage regulator 10 and a transformer 11 are provided as means for changing the amount of emitted electrons.
  • the AC voltage regulator 10 and the transformer 11 change the electron emission amount of the filament cathode 5 by changing the voltage value applied to both ends of the filament cathode 5.
  • the transformer 11 shown in FIG. 5 may be a transformer having a center tap with no center tap in FIG.
  • the output voltage changing method of the DC voltage regulator 9 and the AC voltage regulator 10 is not limited to manual operation, and a voltage is applied to the anode 3 and the grid 8 that change the luminance.
  • the voltage value may be changed in conjunction with the duty ratio of the power supply.
  • a duty ratio control unit 12 is provided as an electron emission amount changing means.
  • the duty ratio control unit 12 changes the duty ratio of the voltage applied to both ends of the filamentary cathode 5 by changing the ratio of the time for applying the voltage per unit time of the filament power supply 7 to change the electron emission amount. Make a change.
  • the duty ratio control unit 12 uses the filament shape control unit 12 Set the duty ratio of the voltage applied to cathode 5 to a low value. For example, as shown in Fig. 7, when the duty ratio during a certain period T is set to S and the voltage is applied to the filamentary cathode 5 when the brightness is high, and the brightness is lower than this, the duty ratio If S is set smaller than that at high brightness and the duty ratio is set, the current flowing through the filamentary cathode 5 per period T decreases, and electrons are emitted. The amount is reduced and the calorific value is also reduced. As a result, the filamentary cathode 5 becomes low temperature, and the light emission of the filamentous cathode 5 is also reduced.
  • the duty change method of the duty ratio control unit 12 is not limited to manual operation, and is changed in conjunction with the duty ratio of the power source that applies voltage to the anode 3 and the grid 8 that change the luminance. It ’s okay.
  • the force that forms the anode 3 and the light emitting surface 4 in a rectangular shape is not limited thereto, and can be formed in any shape such as letters and symbols, and the shape can be displayed. .
  • the force that forms the anode 3 and the light emitting surface 4 in a rectangular shape is not limited thereto, and can be formed in any shape such as letters and symbols, and the shape can be displayed. .
  • by forming a large number of dots and selectively applying a positive potential to each dot-shaped anode 3 it is possible to display not only characters and symbols but also various displays such as figures by combining the dots. .
  • the luminance was changed by changing the duty ratio of the voltage applied to the anode 3 and the grid 8.
  • the duty ratio may be constant, and the electron emission amount may be changed only by changing the electron emission amount of the filament cathode 5 by means for changing the amount of electron emission. That is, the amount of electrons colliding with the light emitting surface 4 is not changed by controlling the amount of electrons attracted by the anode 3 and the grid 8 but by changing the amount of electrons generated on the filamentary cathode 5 side.
  • the brightness may be changed by changing the light emission frequency.
  • the fluorescent display tube 1 according to appendix 1, characterized in that it comprises either a DC voltage regulator 9 or an AC voltage regulator 10 and a transformer 11 that change the amount of electron emission by changing
  • the present invention is not limited to the above-described embodiment as long as means for changing the amount of electrons emitted from the filamentary cathode 5 as the electron source according to the emission luminance of the fluorescent display tube 1 is provided. Applicable.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

L’invention concerne un tube d’affichage fluorescent dans lequel l’éclairage du filament peut être limité à un niveau qui ne crée pas de problèmes de qualité d’affichage en dépit de l’obscurité ambiante et de la faible luminance et dont la consommation d’énergie peut être réduite. Le tube d’affichage fluorescent (1) comprend une enveloppe hermétique (2), une anode (3) formée sur la surface intérieure de l’enveloppe (2), une surface émettrice de lumière (4) formée sur la surface de l’anode (3) et comportant une substance fluorescente, et une cathode de type filament (5) se prolongeant dans l’enveloppe (2) et à laquelle une tension est appliquée. Le tube d’affichage fluorescent est caractérisé en ce qu’il comporte en outre un moyen de modification de la quantité d’émission d’électrons servant à modifier la quantité d’émission d’électrons provenant de la cathode de type filament (5). La cathode de type filament (5) comporte une cathode de type en couche à forte luminance (5a) et une cathode de type en couche à faible luminance (5b) fournissant des quantités d’émission d’électrons différentes lors de l’application d’une même tension, et le moyen de modification de quantité d’émission d’électrons comporte un module de commutation de filament (6) qui applique une tension à l’une ou l’autre de la cathode de type en couche à haute luminance (5a) et de la cathode de type en couche à faible luminance (5b) et commute entre les éléments de la cathode de type filament (5) auxquels la tension est appliquée.
PCT/JP2006/303022 2005-03-04 2006-02-21 Tube d’affichage fluorescent Ceased WO2006092981A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2007505854A JP4176139B2 (ja) 2005-03-04 2006-02-21 蛍光表示管

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2005-060205 2005-03-04
JP2005060205 2005-03-04

Publications (1)

Publication Number Publication Date
WO2006092981A1 true WO2006092981A1 (fr) 2006-09-08

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ID=36941016

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2006/303022 Ceased WO2006092981A1 (fr) 2005-03-04 2006-02-21 Tube d’affichage fluorescent

Country Status (2)

Country Link
JP (1) JP4176139B2 (fr)
WO (1) WO2006092981A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017044912A (ja) * 2015-08-27 2017-03-02 双葉電子工業株式会社 蛍光表示管
US9823050B2 (en) 2013-10-01 2017-11-21 Mission Ready Services, Inc. Integrated body armor garment

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6388735A (ja) * 1986-10-01 1988-04-19 Futaba Corp 蛍光発光管
JPH04106847A (ja) * 1990-08-27 1992-04-08 Ise Electronics Corp 画像装置用光源管
JP2002229498A (ja) * 2001-02-07 2002-08-14 Futaba Corp 蛍光表示管の駆動回路
JP2002334674A (ja) * 2001-05-09 2002-11-22 Noritake Itron Corp 蛍光表示管及びその駆動方法並びに駆動回路
JP2004294726A (ja) * 2003-03-26 2004-10-21 Sanyo Electric Co Ltd 蛍光表示管駆動回路

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6388735A (ja) * 1986-10-01 1988-04-19 Futaba Corp 蛍光発光管
JPH04106847A (ja) * 1990-08-27 1992-04-08 Ise Electronics Corp 画像装置用光源管
JP2002229498A (ja) * 2001-02-07 2002-08-14 Futaba Corp 蛍光表示管の駆動回路
JP2002334674A (ja) * 2001-05-09 2002-11-22 Noritake Itron Corp 蛍光表示管及びその駆動方法並びに駆動回路
JP2004294726A (ja) * 2003-03-26 2004-10-21 Sanyo Electric Co Ltd 蛍光表示管駆動回路

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9823050B2 (en) 2013-10-01 2017-11-21 Mission Ready Services, Inc. Integrated body armor garment
JP2017044912A (ja) * 2015-08-27 2017-03-02 双葉電子工業株式会社 蛍光表示管

Also Published As

Publication number Publication date
JPWO2006092981A1 (ja) 2008-08-07
JP4176139B2 (ja) 2008-11-05

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