EP0109671B1 - Licht emittierendes Element - Google Patents

Licht emittierendes Element Download PDF

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Publication number
EP0109671B1
EP0109671B1 EP83111537A EP83111537A EP0109671B1 EP 0109671 B1 EP0109671 B1 EP 0109671B1 EP 83111537 A EP83111537 A EP 83111537A EP 83111537 A EP83111537 A EP 83111537A EP 0109671 B1 EP0109671 B1 EP 0109671B1
Authority
EP
European Patent Office
Prior art keywords
tubes
tube
fact
light
board according
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.)
Expired
Application number
EP83111537A
Other languages
English (en)
French (fr)
Other versions
EP0109671A2 (de
Inventor
Erwin Nobs
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.)
Omega Electronics SA
Original Assignee
Omega Electronics SA
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 Omega Electronics SA filed Critical Omega Electronics SA
Publication of EP0109671A2 publication Critical patent/EP0109671A2/de
Application granted granted Critical
Publication of EP0109671B1 publication Critical patent/EP0109671B1/de
Expired legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/313—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being gas discharge devices
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F13/00—Illuminated signs; Luminous advertising
    • G09F13/26—Signs formed by electric discharge tubes

Definitions

  • the present invention relates to a display board according to the preamble of claim 1.
  • the major drawbacks presented by the incandescent lamp are its high consumption (between 20 and 40 watts per element) and its relatively low efficiency (around 10 lumens per watt). It will also be noted that the lamp has a modest lifespan (1000 hours on average), a color temperature which is variable depending on the supply voltage at its terminals as well as a gradual decrease in its light intensity due to darkening. inside the bulb depending on the time of use.
  • Such a light source has already been proposed to equip color display boards. In this case, three individual lamps followed by colored filters will be used per unitary element, or more simply three colored bulb lamps. It will however be understood that, for the color, the drawbacks mentioned above for the black-white display are preserved. The truth is, however, to say that incandescent lamps are inexpensive, easily interchangeable and easy to find on the market.
  • the black-white screen 4.3 m high and 8.6 m wide has 160 lines and 80 columns, which implies the use of 12,800 incandescent lamps. If the power of each of these lamps is 25 W, the power required to light them all at full brightness will be 320 kW. It will therefore be understood that such a screen will require considerable installed power as well as no less significant energy expenditure.
  • the cathode ray tube is used in color screen installations, as can be seen in documents GB-A-2 053 547 and US ⁇ A ⁇ 4326 150.
  • it is of a tube whose invoice is simplified compared to that known from TV tubes, it is nonetheless very expensive and above all requires the use of very high acceleration voltages, which considerably complicates the realization from the whole.
  • this tube has the advantage of low energy consumption compared to that of an incandescent lamp.
  • the present invention provides a display board according to claim 1.
  • they are tubes of variable length rectilinear or curved, having at each end of the electrodes constituted by a filament covered with a deposit of emissive oxide.
  • the gaseous atmosphere contained in the tube consists of argon for priming, at the pressure of a few millimeters of mercury, and a drop of mercury.
  • the discharge in the mercury vapor essentially causes ultraviolet rays at the wavelength of 253.7 nm.
  • the wall of the tube appears white, an aspect which the fluorescent substance (phosphor) applied to the interior gives it, and intended to convert ultra-violet radiation into visible light.
  • Some luminous signs also use so-called luminescent tubes for which the discharge in the gas directly creates the luminous effect.
  • the wall of the tube is either transparent or colored without taking advantage of the phenomenon of fluorescence.
  • the arrangement described in GB-A-354 908 mentions neon-filled tubes - which will give an organically red color - or mercury vapor - which will give a blue color -.
  • this arrangement in no way constitutes a matrix table since it is composed of a multitude of rectilinear segments of various lengths and nested in such a way that we form such a letter or a number by lighting a number determined from these segments.
  • the light emitting element described in document DE-A-2 031 610 also uses neon tubes to equip a display system with scrolling writing.
  • the element cited comprises three tubes emitting different colors. However, no means for mixing the colors is indicated which would allow light to be obtained at the output of the element, the resulting wavelength of which may vary along the entire visible spectrum.
  • luminescent tubes are ill-suited to the use we want to make of them in a matrix display board since to obtain the three fundamental colors we have to combine the filling gas with the color of the tube, which leads to elements which no longer have the same light intensity for each of the three tubes.
  • the fluorescent tube Compared to the incandescent lamp, the fluorescent tube has several advantages. It has a high light output of around 40 lumens per watt, which leads to significantly less consumption for a comparable light output. Its average lifespan exceeds 7,500 hours, which contributes to increasing the reliability of the entire bulletin board. It also shows a very weak release of heat, which has the effect of reducing convection movements and hence blackish streaks of dust brought by this convection. Finally, the tube has an invariable color temperature depending on the brightness it produces, as well as a very slight blackening of the bulb - located at the location of the electrodes - depending on its lifespan.
  • the fluorescent tube Compared to the cathode ray tube, the fluorescent tube has an almost equal consumption, on the other hand its price is much lower and it does not require very high voltage supply. In addition, the number of electrodes is reduced to two.
  • the use of the fluorescent tube in large display boards as provided for in the present invention makes it possible to propose a new advantageous product by its reduced consumption, by the quality of the images transmitted and by its reasonable price.
  • Figure 1 shows a matrix table as known from the prior art.
  • the actual panel 1 is fitted with incandescent bulbs 2 aligned in rows and columns next to each other. This arrangement commonly used in stadiums can reach very large dimensions as seen above.
  • This cabin is equipped with all the equipment necessary for the transmission of static or moving images. It is thus possible to display texts such as sports results, advertising, animated events or repeats of said events by means of cameras, discs, magnetic tapes, etc.
  • Each light emitting element corresponds to an incandescent bulb if the display takes place in black and white.
  • a device then makes it possible to vary the light intensity produced by the bulb to result in the multiple gradations of light that make up an image.
  • each of these elements will include three incandescent bulbs (red, green, blue) or three cathode ray tubes.
  • incandescent bulbs red, green, blue
  • cathode ray tubes By varying the light intensity produced by the three tubes separately, we obtain a resultant light which can cover the entire visible spectrum.
  • the present invention aims to replace the incandescent lamp or the cathode ray tube by at least one discharge tube generally called fluorescent tube to form the light emitting element.
  • Figure 2 shows such an element 24.
  • the fluorescent tube 5 is mounted in a compartment 6.
  • the tube 5 must have a certain length.
  • the visible face 7 of the element remains included in dimensions which are compatible with the proposed matrix display, ie approximately 80 cm 2 , which represents a square of 9 cm side.
  • the compartment shown in Figure 2 is parallelepiped.
  • the compartment could be triangular, the top of the triangle being at the location of the tube connections and this in order to improve the reflection effect presented by the walls.
  • the front face could be provided with an anti-reflection system.
  • the light emitting element which has just been described finds its application in black-white tables.
  • the element will be fitted with a base for electrical connections and a simple fastening system to make it easily removable. Thus designed, it will be easily interchangeable and very accessible to maintenance personnel.
  • FIG. 3 shows a colored light emitting element 24 equipped with three fluorescent tubes. It differs from that presented in FIG. 2 only by the juxtaposition of three fluorescent tubes of different colors referenced 10, 11 and 12. As already mentioned above, it is the fluorescent substance applied to the wall of the tube which converts the ultraviolet radiation from the discharge into visible light. Thus, in the element of FIG. 3, the tube 10 radiates in red (then calcium borate is used as the fluorescent substance), the tube 11 in the green (end) and the tube 12 in the blue (tungstate of calcium). With a mixture in suitable proportions of the different substances, white light is produced, and it is this mixture that is used for the tube drawn in FIG. 2.
  • the three basic colors can also be obtained from three white tubes each completed by an independent color filter located at the front of the tube. If this arrangement has the disadvantage of adding additional components and reducing the light output, it has however for him to use only tubes of a single white color not requiring special preparation as for their fluorescent substance.
  • FIG. 4 is a front view of the element 24 of FIG. 3. From this view, it is possible to envisage other arrangements of the tubes in the emitting element where, for example,
  • FIG. 5 shows an arrangement where the tubes are placed end to end to circumscribe a closed surface, here a triangle, and
  • Figure 6 shows a spiral arrangement where the tubes observed from the front face have portions of circles. The ends of these portions are bent at 90 ° to form rectilinear parts which extend behind the plane of the figure.
  • the colored element is not limited to the use of three tubes.
  • a fourth tube for example, could be added which, in certain circumstances, can improve the continuity of the light spectrum.
  • FIG. 7 gives a possible diagram of the supply of a light emitting element 24 according to the invention.
  • the element has three fluorescent tubes 20 (red), 21 (blue) and 22 (green).
  • a power generator 23 sized to supply a plurality of elements produces a voltage Ug whose frequency is chosen between 5 and 30 kHz from the mains voltage Us.
  • the filaments 25 to 30 are supplied by means of the transformer 31 common to the filaments 26, 28 and 30 and transformers 32, 33 and 34 to supply the filaments 25, 27 and 29 respectively. The primary of each of these transformers is connected to the Ug power source.
  • the transformer 31 can also be dimensioned to supply a plurality of tubes and not only the three tubes forming the light emitting element.
  • the tubes 20, 21 and 22 are ignited by acting respectively on the elements 35, 36 and 37 placed in series in the tube circuit and which appear in the figure in the form of switches.
  • the circuit of each of the tubes is completed respectively by an element 38, 39 and 40 which aims to stabilize the current flowing in the tube.
  • This element can be a resistor, an inductor or even a capacitor. The first case is of little interest because the resistance causes additional losses. In the last two cases, these will be space-saving elements given the high operating frequency.
  • the intensity of the light supplied by each of the tubes will depend in this system on the time during which its switch will remain closed with respect to a reference period that is set.
  • the elementary colors of each of the tubes judiciously and that the light flux emitted by each of them is adjusted separately through the closing time of their respective switch, one will finally obtain a color which will be the result of the mixture of each of the corresponding luminous fluxes and which may extend over the entire visible spectrum.
  • the switches 35, 36 and 37 can take various forms, for example, in the form of triacs controlled by the video signals generated by a camera taking pictures via an A / D converter and an appropriate control logic. We find here the means already con bare of the state of the art and which are applied in the matrix color tables which one finds on the market.
  • FIG. 8 is a time diagram showing the supply voltage Ug applied to the terminals of the tubes and the currents 1 20 , I 21 and 1 22 flowing in each of them as a function of the respective closure of the control elements 35, 36 and 37.
  • the first line represents the supply voltage Ug supplied by the generator 23 (see FIG. 7).
  • This voltage is formed by the juxta-position of reference periods T, each comprising at least 64 half-waves T a .
  • the tube 20 (red) is turned on at the desired light intensity by closing the element 36 for a period T 1 and T, from which a current I 20 results in the tube.
  • the supply of the light emitting element is not limited to the description given above.
  • the number of alternations is no longer varied during the reference period, but the width of these alternations. This leads to pulse width modulation (PWM).
  • PWM pulse width modulation

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Illuminated Signs And Luminous Advertising (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Claims (7)

1. Matrixförmige Anzeigetafel (1) mit einer Vielzahl lichtemittierender Elemente (24), wobei jedes Element wenigstens drei Röhren (20, 21, 22) aufweist, deren Innenwände mit einer fluoreszierenden Substanz beschichtet sind, so daß die erste rotes Licht erzeugt, die zweite grünes Licht erzeugt und die dritte blaues Licht erzeugt und wobei die Röhren mittels eines Generators mit Energie versorgt werden, während eine Unterbrecheranordnung (35, 36, 37) in der Versorgungsschaltung einer jeden Röhre in Serie geschaltet ist und in Schließstellung gebracht wird durch ein Steuersignal während einer Zeitdauer (T1, T2, T3), die der Anlege zeit dieses Signals entspricht, um so unabhängig die Lichtintensitäten einer jeden Röhre zu variieren und am Ausgang eines jeden Elements (24) ein Licht zu erhalten, dessen resultierende Wellenlänge über das gesamte sichtbare Spektrum variabel ist, dadurch gekennzeichnet, daß die Röhren Gasentladungsröhren sind, die Quecksilberdampf bei niedrigem Druck enthalten und daß der Generator ein Hochfrequenzgenerator ist.
2. Tafel nach Anspruch 1, dadurch gekennzeichnet, daß der Hochfrequenzgenerator einen Strom liefert, der aus einer Folge von Referenzperioden (Tr) besteht, deren jede eine Vielzahl von Halbperioden (Ta) aufweist und daß die Brennzeit einer jeden Röhre (20, 21, 22) der Schließzeit der zugehörigen Unterbrecheranordnung (35, 36, 37) entspricht, wobei die gewünschte Lichtintensität durch Unterdrückung einer vorbestimmten Zahl von Halbperioden (Ta) in der genannten Referenzperiode (Tr) erzielt wird.
3. Tafel nach Anspruch 2, dadurch gekennzeichnet, daß die Referenzperiode wenigstens 64 Halbperioden (Ta) enthält.
4. Tafel nach Anspruch 1, dadurch gekennzeichnet, daß die Röhren solche mit heißen Kathoden sind.
5. Tafel nach Anspruch 1, dadurch gekennzeichnet, daß die ein Element bildenden Röhren nebeneinander angeordnet sind.
6. Tafel nach Anspruch 1, dadurch gekennzeichnet, daß die ein Element bildenden Röhren endseitig aneinanderliegen und eine geschlossene Fläche umfassen.
7. Tafel nach Anspruch 1, dadurch gekennzeichnet, daß die ein Element bildenden Röhren dachziegelartig angeordnet und gekrümmt sind, um eine Spirale zu formen.
EP83111537A 1982-11-23 1983-11-18 Licht emittierendes Element Expired EP0109671B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR828220334A FR2536563B1 (fr) 1982-11-23 1982-11-23 Element emetteur de lumiere a tube a decharge pour tableau d'affichage matriciel
FR8220334 1982-11-23

Publications (2)

Publication Number Publication Date
EP0109671A2 EP0109671A2 (de) 1984-05-30
EP0109671B1 true EP0109671B1 (de) 1988-04-20

Family

ID=9279784

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83111537A Expired EP0109671B1 (de) 1982-11-23 1983-11-18 Licht emittierendes Element

Country Status (7)

Country Link
US (1) US4559480A (de)
EP (1) EP0109671B1 (de)
JP (1) JPS59140481A (de)
AU (1) AU561918B2 (de)
CA (1) CA1212711A (de)
DE (1) DE3376366D1 (de)
FR (1) FR2536563B1 (de)

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Also Published As

Publication number Publication date
FR2536563B1 (fr) 1985-07-26
AU2159183A (en) 1984-05-31
AU561918B2 (en) 1987-05-21
DE3376366D1 (en) 1988-05-26
US4559480A (en) 1985-12-17
EP0109671A2 (de) 1984-05-30
JPS59140481A (ja) 1984-08-11
CA1212711A (en) 1986-10-14
FR2536563A1 (fr) 1984-05-25

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