CN101669190A - Long-life hot-cathode fluorescent lamp, backlight or illuminator, having the long-life hot-cathode fluorescent lamp, and its start-up method - Google Patents
Long-life hot-cathode fluorescent lamp, backlight or illuminator, having the long-life hot-cathode fluorescent lamp, and its start-up method Download PDFInfo
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- CN101669190A CN101669190A CN200880013479A CN200880013479A CN101669190A CN 101669190 A CN101669190 A CN 101669190A CN 200880013479 A CN200880013479 A CN 200880013479A CN 200880013479 A CN200880013479 A CN 200880013479A CN 101669190 A CN101669190 A CN 101669190A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/02—Details
- H01J61/04—Electrodes; Screens; Shields
- H01J61/06—Main electrodes
- H01J61/067—Main electrodes for low-pressure discharge lamps
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/02—Details
- H01J61/30—Vessels; Containers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/02—Details
- H01J61/38—Devices for influencing the colour or wavelength of the light
- H01J61/42—Devices for influencing the colour or wavelength of the light by transforming the wavelength of the light by luminescence
Abstract
Even a backlight having a long-life hot-cathode fluorescent lamp exhibits a short start-up time. The hot-cathode fluorescent lamp (10) which the backlight (100) has comprises a bulb (12), a filament,and a pair of lead wires (13) holding the filament (14). The hot-cathode fluorescent lamp (10) is equipped with a blackening preventive means (50). The blackening preventive means (50) is realized byusing a filament (14) for producing an interterminal glow (52) between the paired lead wires (13) in pre-heating the filament (14) after (57) emission of thermoelectrons till before (55) the filamenttemperature reaches a blackening formation region (51).
Description
Technical field
The present invention relates to long-life hot-cathode fluorescent lamp and startup method thereof, particularly relate to backlight, lighting device and startup method thereof that big frame TV machine is used.
Background technology
Current, the light source of backlight liquid crystal display lamp unit mainly adopts cold-cathode fluorescence lamp.Because cold-cathode fluorescence lamp is suitable for making minor diameter, therefore its light source as the backlight unit that requires slimming is used (reference example such as patent documentation 1).
Patent documentation 1: Japanese kokai publication sho 56-73855 communique
The problem that solves is wanted in invention
In recent years, the maximization of LCD is developing always, and backlight unit also maximizes thereupon.Because the maximization of backlight unit when using cold-cathode fluorescence lamp as light source, has to increase the use number of fluorescent tube, it is complicated that lamp circuit becomes, the problem that also has consumed power to increase simultaneously.
In more detail, cold-cathode fluorescence lamp is compared with other lamp, and it is bigger to drive needed voltage (driving voltage), must use high voltage source.Particularly owing to the large-scale LCD (for example 32 inch, 42 inch, 46 inch, 65 inch or its above LCD) of picture dimension above 32 inches occurs recently, the length of lamp becomes more and more longer, therefore, with its respective drive voltage the more and more tendency of high-pressure trend is arranged also.
In addition, because each power that uses of cold-cathode fluorescence lamp is little, in order to ensure the brightness of picture, need a lot of lamps, therefore, not only the parts cost increases, and assembles the possibility that required problems such as increase in man-hour highlight and also increased.
Under these circumstances, begin to inquire into employing and the light source of the hot-cathode fluorescent lamp of more high efficiency, higher output as backlight arranged than cold-cathode fluorescence lamp.By adopting hot-cathode fluorescent lamp, utilize above-mentioned speciality, suppress consumed power, reduce the fluorescent lamp number simultaneously, be expected to simplify lamp circuit, reduce the parts cost, reduce and assemble man-hour.But as backlight unit, the exploitation of cold-cathode fluorescence lamp, research are performed until today, and consequently, in fact the shortcoming of hot-cathode fluorescent lamp is not overcome.
At first, there be the shortcoming shorter than the cold-cathode fluorescence lamp life-span in hot-cathode fluorescent lamp under the situation that the light source of using as backlight uses.This is to cause owing to the emitter that is coated with on the filament of hot-cathode fluorescent lamp disperses, and the life-span is thousands of hours usually.This life-span is enough for general lighting, but the light source of using for the backlight that requires the life-span more than 20,000 hours but is not enough.
Therefore, the application's applicant is in order to prolong the life-span of hot-cathode fluorescent lamp, carry out filament is extended, with this research, exploitation that is coated with more emitter, successfully made the long-life hot-cathode fluorescent lamp (reference example such as Japanese Patent Application 2006-169204 communique) that to guarantee more than 20,000 hours.
But, according to present inventor's research,, have the thermal capacitance quantitative change of filament big as can be known because the elongated influence of filament, warm-up time (being that filament rises to the needed time of suitable temperature) elongated new problem.Cold-cathode fluorescence lamp does not need preheating basically, and under the situation of hot-cathode fluorescent lamp, to the destruction of filament, preheating is necessary when starting in order to relax, and therefore making preheat curent flow into filament when starting is important setting up procedure.
If warm-up time is long, the time (start-up time) till then lighting to backlight inevitably is elongated, thereby the start-up time of image display device (for example LCD) is also slow.At that rate, even after hot-cathode fluorescent lamp is realized the long-life, the cold-cathode fluorescence lamp of comparing weak point start-up time still has shortcoming, and this problem is wished and can be resolved.
Even and illuminating hot-cathode fluorescent lamp also trends towards long lifetime recently, if equally with backlight reach the long-life of nominal life-span more than 20,000 hours, then the same with backlight again long problem start-up time that produces before lighting is compared with existing fluorescent lamp or shortcoming is arranged.
Summary of the invention
The present invention makes in view of such existing problems, and its main purpose is that the hot-cathode fluorescent lamp that can shorten start-up time, the backlight that possesses this hot-cathode fluorescent lamp and lighting device and startup method thereof are provided.
Backlight of the present invention is the backlight that possesses hot-cathode fluorescent lamp, described hot-cathode fluorescent lamp by the fluorescent tube that forms fluorophor at inner surface, be arranged at the filament of the inner and thermionic emitter of coating emission of described fluorescent tube and support the pair of lead wires of described filament to constitute, at described hot-cathode fluorescent lamp melanism is set and suppresses parts, described melanism suppresses parts when utilizing described filament pre-heating arrive melanism a period of time before forming the zone after described thermionic emission, and the filament that glow discharge takes place between the terminal is realized.
In a certain preferred example, described backlight also possesses lamp circuit, and described lamp circuit is by flowing through the filament preheating circuit of preheat curent and provide the lamp power supply circuit of electric power to constitute when described hot-cathode fluorescent lamp is lit a lamp when the described filament pre-heating.
In a certain preferred example, described backlight be under the backlight of type device used for image display.
In a certain preferred example, described hot-cathode fluorescent lamp is to be the lamp more than 50,000 hours in the nominal life-span.
In a certain preferred example, the above emitter of coating 10.0mg on the described filament of an electrode in the pair of electrodes in of described hot-cathode fluorescent lamp.
In a certain preferred example, described filament is made of the quadruple coil.
In a certain preferred example, above-mentioned backlight is the light source that the LCD of 32 to 46 inches picture dimensions is used, 4 to 6 above-mentioned hot-cathode fluorescent lamps of configuration in above-mentioned basket.
Backlight lamp starting method of the present invention is the startup method that possesses the backlight of hot-cathode fluorescent lamp, during filament pre-heating that described hot-cathode fluorescent lamp has, a period of time before the arrival melanism forms the zone after thermionic emission, between the pair of lead wires of supporting described filament, make glow discharge takes place between the terminal, suppress the generation of the melanism of described hot-cathode fluorescent lamp with this.
In a certain preferred example, described hot-cathode fluorescent lamp is to be the lamp more than 50,000 hours in the nominal life-span.
Hot-cathode fluorescent lamp of the present invention is to be the hot-cathode fluorescent lamp more than 20,000 hours in the nominal life-span, described hot-cathode fluorescent lamp is by the fluorescent tube that forms fluorophor at inner surface, be arranged at the filament of described fluorescent tube inside and the thermionic emitter of coating emission, and support the pair of lead wires of described filament to constitute, at described hot-cathode fluorescent lamp melanism is set and suppresses parts, described melanism suppresses parts when utilizing described filament pre-heating arrive melanism a period of time before forming the zone after described thermionic emission, and the filament that glow discharge takes place between the terminal is realized.
In a certain preferred example, described hot-cathode fluorescent lamp is illuminating lamp.
In a certain preferred example, described hot-cathode fluorescent lamp is to be the lamp more than 50,000 hours in the nominal life-span.
In a certain preferred example, the above emitter of coating 10.0mg on the described filament of an electrode in the pair of electrodes in of described hot-cathode fluorescent lamp.
In a certain preferred example, described filament is made of the quadruple coil.
Lighting device of the present invention is the lighting device that possesses hot-cathode fluorescent lamp and described hot-cathode fluorescent lamp, described hot-cathode fluorescent lamp is technical scheme 9 described hot-cathode fluorescent lamps, and described lamp circuit is by flowing through the filament preheating circuit of preheat curent and provide the lamp power supply circuit of electric power to constitute when described hot-cathode fluorescent lamp is lighted when the described filament pre-heating.
The startup method of hot-cathode fluorescent lamp of the present invention is to be the startup method of the hot-cathode fluorescent lamp more than 20,000 hours in the nominal life-span, during filament pre-heating that described hot-cathode fluorescent lamp has, a period of time before the arrival melanism forms the zone after thermionic emission, between the pair of lead wires of supporting described filament, make glow discharge takes place between the terminal, suppress the generation of the melanism of described hot-cathode fluorescent lamp with this.
In a certain preferred example, described hot-cathode fluorescent lamp is to be the fluorescent lamp more than 50,000 hours in the nominal life-span.
If adopt backlight of the present invention, then in the hot-cathode fluorescent lamp of filament, be provided with melanism and suppress parts with the thermionic emitter of coating emission, reach melanism after the thermionic emission when these melanism inhibition parts utilize filament pre-heating and form the filament realization that zone a period of time before makes generation glow discharge between the terminal, even so strengthen the preheat curent shortening and also can suppress melanism warm-up time.That is to say, glow discharge inhibition melanism takes place between the terminal, therefore can increase preheat curent, consequently can shorten start-up time by making.
Particularly long-life hot-cathode fluorescent lamp (for example making the hot-cathode fluorescent lamp of quadruple coil lengthening filament length), because the thermal capacitance quantitative change of filament is big, there is elongated tendency start-up time, if but adopt backlight of the present invention, suppress parts owing to have utilization reaching the melanism that melanism makes before forming the zone filament that glow discharge takes place between the terminal realize, do not introduce the backlight that new parts also can shorten start-up time even can provide.
If adopt hot-cathode fluorescent lamp of the present invention, melanism then is set suppresses parts, this melanism suppresses parts reach after the thermionic emission when utilizing filament pre-heating melanism form before the zone the time glow discharge takes place between the chien shih terminal filament realize, shorten warm-up time and also can suppress melanism even therefore strengthen preheat curent.That is to say, glow discharge inhibition melanism takes place between the terminal, thus, can increase preheat curent, consequently, can shorten start-up time by making.
If adopt lighting device of the present invention, then in the hot-cathode fluorescent lamp of filament, melanism is set and suppresses parts with the thermionic emitter of coating emission, this melanism suppresses parts when utilizing filament pre-heating reaches a period of time that melanism forms before the zone after the thermionic emission filament that glow discharge takes place between the terminal is realized, therefore, also can suppress melanism warm-up time even strengthen the preheat curent shortening.That is to say, glow discharge inhibition melanism takes place between the terminal, can increase preheat curent thus, consequently can shorten start-up time by making.
If adopt the startup method of hot-cathode fluorescent lamp of the present invention, then before the arrival melanism forms the zone, make glow discharge takes place between the terminal, therefore can shorten the startup of carrying out hot-cathode fluorescent lamp start-up time.
Description of drawings
Fig. 1 is the figure that is used to illustrate the structure of the backlight 100 of example of the present invention and lamp circuit.
Fig. 2 is the face figure that schematically shows the hot-cathode fluorescent lamp 10 of example of the present invention.
Fig. 3 is the profile of structure of the backlight 100 of expression example of the present invention.
Fig. 4 is the vertical view of structure of the backlight 100 of expression example of the present invention.
Fig. 5 is the exploded perspective view of structure that is used to illustrate the backlight 100 of example of the present invention.
Fig. 6 (a)～(c) schematically shows the filament temperature Tf when starting and the curve chart of the relation of conduction time (t).
Fig. 7 (a)～(c) schematically shows the filament temperature Tf when starting once again and the curve chart of the relation of conduction time (t).
Fig. 8 (a) and (b) be to schematically show the filament temperature Tf when starting and the curve chart of the relation of conduction time (t).
Fig. 9 is the result's of expression embodiments of the invention a curve chart.
Figure 10 is the result's of expression embodiments of the invention a curve chart.
Figure 11 is the result's of expression embodiments of the invention a curve chart.
Symbol description
10 hot-cathode fluorescent lamps
11 electrodes
12 fluorescent tubes
13 lead-in wires
14 filaments
15 beades
16 encapsulation
17 blast pipes
18 lamp holders
20 baskets
21 reflecting plates
22 auxiliary reflecting plates
23 reflector plates
24 pillars
30 optical sheets
31 deflection films
32 lens
33 diffusion disks
34 diffusing panels
40 filament preheating circuits
45 lamp power supply circuits
50 melanism suppress parts
51 melanism form the zone
Glow discharge between 52 terminals
60 liquid crystal panels
62 loam cakes
65 image display area
70 lamp circuits
72 lower covers
75 lamp brackets
100 backlights
Embodiment
The application's inventor thinks, what be suitable for backlight that LCD that big pictureization accelerates day by day uses is not to adopt current cold-cathode fluorescence lamp as main flow (CCFL), every lamp can obtain the hot-cathode fluorescent lamp (HCFL) of bigger power output compared with cold-cathode fluorescence lamp and consider to use instead, then it is studied, develops.Consider that such reason that turns to is, utilize the feature of " the big power output " of hot-cathode fluorescent lamp, can strengthen the contrast of liquid crystal TV set, can make and comprise dynamic image and become better in interior image quality, and compared with cold-cathode fluorescence lamp, the number of the fluorescent lamp that uses as backlight also can be cut down significantly, can reduce cost.
In such developmental research, the present inventor obtains the long-life hot-cathode fluorescent lamp that solved life problems because big former of the thermal capacitance quantitative change of filament thereby problem that start-up time is elongated.But, be coated with the more multiple beam filament that need extend, so the thermal capacitance quantitative change of filament is big inevitably in order to realize long-life hot-cathode fluorescent lamp.That is to say that thermal capacity increases to increase the start-up time cause and is and the closely-related problem of long-life hot-cathode fluorescent lamp, keep simply being difficult to address this problem with in a way the low cost and the structure and the lamp circuit of lamp.
If present inventor's process studies intensively and finds to make wittingly common inappropriate discharge is that glow discharge takes place, even then strengthen preheat curent in order to shorten warm-up time, also can not enter melanism and form the zone, promptly can suppress the generation of the melanism of hot-cathode fluorescent lamp, thereby realize the present invention.
With reference to the accompanying drawings example of the present invention is described.In following accompanying drawing, for the purpose of simplifying the description, the structural element that has identical functions in fact is with identical symbolic representation.Also have, the invention is not restricted to following example.
At first see figures.1.and.2, the backlight 100 of example of the present invention is described.Fig. 1 is the figure that is used to illustrate the structure of the backlight 100 of this example and lamp circuit 40,45, and Fig. 2 is the profile of the structure of the expression hot-cathode fluorescent lamp 10 that is contained in backlight 100.
The backlight 100 of this example is made of hot-cathode fluorescent lamp 10 and the basket (not shown) that holds thermionic-cathode tube.Hot-cathode fluorescent lamp 10 particularly as shown in Figure 2, by the fluorescent tube 12 that forms fluorophor (not shown) at inner surface, be arranged at the filament 14 in the fluorescent tube 12 and support the pair of lead wires 13 of filament 14 to constitute.Coating emission thermionic emitter (not shown) on the filament 14.
In the structure of this example, melanism is set on the hot-cathode fluorescent lamp 10 suppresses parts 50, between a period of time when these melanism inhibition parts 50 utilize filament 14 preheatings before the arrival melanism forms the zone after thermionic emission the filament 14 that glow discharge takes place between the terminal is realized.
Here, the what is called of this example " glow discharge between the terminal ", different with the arc discharge that when lighting a lamp usually, between the two ends of lamp, takes place, be the mode glow discharge that (between the terminal) takes place between pair of lead wires 13 to wrap filament 14.
As shown in Figure 1, the backlight 100 employed lamp circuits of this example provide the lamp power supply circuit 45 of electric power when filament preheating circuit 40 that preheat curent flows through and hot-cathode fluorescent lamp 10 are lit a lamp, hot-cathode fluorescent lamp 10 is electrically connected in filament preheating circuit 40 and lamp power supply circuit 45.
And under the situation of the backlight 100 that starts this example, preheat curent flows into filament 14 from filament preheating circuit 40, and filament 14 is carried out preheating.At this moment along with the preheating of filament 14, the emitter heat of emission electronics of coating on the filament 14, makes wittingly glow discharge takes place between the terminal time before forming the zone from this arrival melanism.By means of the glow discharge between this terminal of having a mind to, suppress the generation of the melanism of hot-cathode fluorescent lamp.
That is to say, the preheat curent value that flows into filament 14 is to set to such an extent that arrive melanism between a period of time before forming the zone behind the emitter heat of emission electronics of filament 14, make the current value that glow discharge can take place between the terminal, this current value is determined by the relation with following parameter (diameter of filament use wire rod (for example tungsten filament) or length etc.).
Additional disclosure, the glow discharge between the terminal are with the luminous discharge of mercury, and it is different from luminous without mercury is owing to preheating and the state that filament reddens.Also have, the melanism of hot-cathode fluorescent lamp 10 forms the zone and has a mind to make the detailed description of mechanism's (melanism suppresses parts 50) that glow discharge takes place between the terminal to carry out below.
Then, with reference to Fig. 2,, the preferred construction example of the backlight 100 of this example is described also with reference to Fig. 3～Fig. 5.Fig. 3 and Fig. 4 are respectively the profile and the vertical views of structure of the backlight 100 of this example of expression.Fig. 5 is the exploded perspective view of structure that is used to illustrate the backlight 100 of this example.
Therefore the hot-cathode fluorescent lamp 10 of this example shown in Figure 2 adopts long-life fluorescent lamp owing to use as backlight.Hot-cathode fluorescent lamp 10 is that lamp more than 1.2 ten thousand hours is advisable with the nominal life-span, and preferably the nominal life-span is more than 20,000 hours or the lamp more than 30,000 hours.Also have, be about 20000 hours, therefore wish to adopt life-span fluorescent lamp of (for example 50000 hours or more than it) more than it to the life-span that is used as the cathode ray tube (CRT) device that display extensively popularizes.
Definition as the life-span has two big key elements, and the one, the attenuation rate of the brightness of lamp (so-called brightness sustainment rate) and not lighting.If imagination is used as backlight, the life-span of restriction hot-cathode fluorescent lamp be to be formed at not lighting that the exhaustion of the thermionic emission material (emitter) on the electrode filaments causes.In order to infer the life-span, according to the rules the condition of lighting a lamp of many lamps (lamp is lighted test continuously with what specified electric current carried out) is carried out lantern test, to light the regular hour lamp after (for example 100 hours, 500 hours, 1000 hours, 2000 hours, 5000 hours) and utilize in regular turn and destroy or non-destructive method is measured the residual quantity of emitter at any time, measure consumption (depletion rate) since the initial stage.Make the graph of relation of lighting a lamp between elapsed time and the emitter consumption amount (or emitter residual quantity) according to these results, utilize linear function to carry out match (fitting), can infer the life-span.Also have, the nominal life-span is to consider that according to the above-mentioned data that obtain the deviation, measurement deviation, manufacture deviation (all with 3 times of standard deviation: 3 σ are benchmark) of consumption determine.
Illustrated hot-cathode fluorescent lamp 10 is made of straight tube-like glass lamp 12 and the pair of electrodes 11 that sets at the two ends of glass lamp 12.
Inner surface at glass lamp 12 is coated with fluorophor (not shown).More particularly, on the inner surface 12a of glass lamp 12, form alumina protective layer, luminescent coating is stacked on this diaphragm.The fluorophor that constitutes luminescent coating can adopt for example fluorophor (Y of burn red
2O
3: Eu), the fluorophor (LaPO of glow green
4: Ce, Tb
3), the fluorophor (BaMg of the coloured light that turns blue
2Al
16O
27: Eu, Mn) mixture of these rare-earth phosphors.In addition, fluorophor also can adopt other terres rares fluorophor.For example, red available (Y, La)
2O
3: Eu, 3.5MgO0.5MgF
2GeO
2: Mn, green available CeMgAl
11O
19: Tb, GdMgB
2O
10: Ce, Tb, blue available (Sr, Ca)
10(PO
4)
6C
12: Eu etc.
At glass lamp 12 inner mercury and the rare gas enclosed.In this example, air pressure is the argon gas (Ar) of 500Pa under the normal temperature of the rare gas of glass lamp 12 interior inclosure about 5mg mercurys (not shown) and work buffering usefulness.Also have, the mercury of enclosing in the glass lamp 12 except mercury simple substance, also can be enclosed with the form of the mercury alloy of zinc-mercury, tin mercury, bismuth, indium mercury etc.
In addition, though the argon gas (Ar) of available 100% content of rare gas, also can be with the mist of sneaking into krypton gas (Kr) in the argon gas (Ar).The mixing ratio (voltage ratio) of krypton gas (Kr) can be for example 20%～60%.For example can use argon gas: the mist (air pressure 600Pa) of krypton gas=50%: 50%.
The emitter of coating is the oxide of strontium, calcium, barium for example on the filament 14.In this example,, increase the emission scale of construction of coating on the filament 14 in order to prolong the life-span of fluorescent lamp, in this example, the above emitter of coating 10.0mg on the filament 14 in the pair of electrodes of each hot-cathode fluorescent lamp 10.In addition, rare gas is not made up of 100% argon gas, but when sneaking into than the big krypton of ar atmo amount with the ratio of regulation, so emitter is not easy to disperse from filament 14, and this means that technically the life-span of lamp can become longer.
The illustrated electrode 11 compacted encapsulation 16 that are sealed in glass lamp 12.In addition, encapsulation blast pipe 17 at least one end of glass lamp 12.This blast pipe 17 is used for discharging, enclosing the gas rear enclosed to carrying out exhaust in the fluorescent tube 12 or enclosing rare gas.
In the end of glass lamp 12, be covered with encapsulation 16 and blast pipe 17 is provided with lamp holder 18.In addition, the lead-in wire 13 that extends outward from encapsulation 16 and the mode of connection of lamp holder 18 according to the specification of lamp 10 suitably decision get final product.For example, also can on the end face (left side of paper and the end face on right side) of lamp holder 18, be configured in the latch that usefulness is installed on the backlight unit, this latch is connected with lead-in wire 13, perhaps also the latch that usefulness is installed can be disposed at the part (for example part of the cylinder of paper face side) of the side of lamp holder 18, carry out and being connected of this latch.
Hot-cathode fluorescent lamp 10 is the lamps that utilize low-pressure mercury vapour discharge, glass lamp is designed to diameter and the length that the consumed power with lamp adapts, and shapes such as straight tube-like, annular and U font are arranged.Be coated with fluorophor on the tube inner wall, between fluorophor and glass, coating prevents the diaphragm (aluminium oxide or SiO 2 powder etc.) that chemical reaction causes deterioration in characteristics to use.As the filament of the electrode normally double coil or the triple coil of tungsten filament, coating is as the emitter of electronic emitting material on the filament.Enclose liquid mercury (or amalgam (Hg amalgam), alloy) in the fluorescent tube and as the rare gas of buffer gas.Usually often use argon gas as rare gas, but different according to the structure of lamp and kind, the situation of the mist that uses krypton gas and neon etc. is also arranged.
Luminous principle is, keep electrode from the coating electronic emitting material by means of discharge (and other means of heating electrode) needed temperature of heat of emission electronics only, can provide electronics, pilot arc discharge (this is the place with cold-cathode fluorescence lamp a great difference).In the Transfer Spectroscopy of the mercury atom that utilizes this discharge to obtain, the ultraviolet ray that mainly utilizes 254nm is converted to visible light as the excitation line of fluorophor and uses.
That is to say that the electrode structure of hot-cathode fluorescent lamp plays important effect like this, and the age limit of this electrode the life-span of lamp.Usually the emitter that is coated on this electrode is exhausted owing to light a lamp for a long time, therefore the nominal life-span that has the fluorescent lamp of general hot cathode is 6,000 hour～18,000 hours, intactly use not reach the desired life-span as the backlight of liquid crystal TV set etc. like this.For hot-cathode fluorescent lamp is used as backlight, long lifetime is the problem that must study.For long lifetime, in any case the inhibition of the consumption of emitter (depletion rate) also has the initial emphasis that more emitter material all is research and development that forms on filament.
In order to suppress the consumption of emitter, improve the pressure of the rare gas of enclosing, or adopt the big gas (for example krypton gas or xenon) of atomic weight in the rare gas, improve its mixing ratio.By means of this, can suppress the emitter on the electrode because dispersing of causing of the bombardment by ions that evaporates by heat, takes place when starting or during the starting the arc once again.And, in order to increase initial emitter coating weight, increase the coiling number of turn, winding diameter, the total length of filament, can carry more emitter, therefore can guarantee the life-span.To the problem that produce under the situation that add the long-life be elaborated below.
As Fig. 3～shown in Figure 5, the backlight 100 of this example be under the backlight of type device used for image display, be as for example more than 26 inches (preferably more than 32 inches.For example 32 inches, 46 inches, 65 inches etc.) the area source used of LCD use.In the example of Fig. 3～shown in Figure 5, in basket 20, hold 6 hot-cathode fluorescent lamps 10, but the number of hot-cathode fluorescent lamp 10 is not to be defined in this number.But, in one of this example desirable example, be the panel of 32 to 46 inches LCD for picture dimension, configurable 4 to 6 hot-cathode fluorescent lamps 10 in the basket 20 make its brightness, work.
In the illustrated structure, as the reflecting plate 21 of the part of basket 20, made by metallic plate (for example electroplating steel plate or aluminium sheet), its thickness is 1.5mm.The part of reflecting plate 21 bends to convex (triangular shape), constitutes auxiliary reflecting plate 22.Comprise on the upper surface (the interarea 20b of basket) of the reflecting plate 21 of assisting reflecting plate 22, formed reflector plate 23.Reflector plate 23 is made of PETG (PET) resin bed that the white titanium dioxide (perhaps calcium carbonate) that is scattered here and there forms, and its thickness is 2.0mm.The pillar 24 that the lower surface of optical sheet 30 is used is supported in formation on the part on the summit (or crest line) of auxiliary reflecting plate 22.Pillar 24 is a white resin system.In addition, the height H of backlight 100 (height from the upper surface of reflecting plate 21 to optical sheet 30 place faces) is for example 27mm.
In addition, below the reflecting plate 21 of backlight 100, collocation point circuit for lamp (ballasting circuit or ballast) 70.As mentioned above, lamp circuit 70 comprises filament preheating circuit 40 and lamp power supply circuit 45.In this example, at each lamp 10 lamp circuit 70 is set respectively, thereby 6 fluorescent lamps 10 use 6 lamp circuits 70 altogether.But also can adopt other structures (number).Lamp circuit 70 is electrically connected with lamp 10, also possesses dimming function.
The lamp bracket 75 of supporting lamp 10 usefulness is set in the end of reflecting plate 21 again.Lamp bracket 75 is made by for example white resin.And optical sheet 30 is set at the peristome 20a place of the basket of backlight 100.In this example, the member that optical sheet 30 comprises, be followed successively by deflection film 31 (DBEF (Dual Brightness EnhancementFilm) that 3M Co., Ltd. in Sumitomo makes, thickness is 0.440mm), lens 32 (thickness 0.155mm), diffusion disk 33 (thickness 0.113mm), diffusing panel 34 (thickness 2.0mm) from top to bottom.Also can lens be set again at the lower surface of diffusing panel 34.
And liquid crystal panel 60 (for example about 2mm of thickness) is set on optical sheet 30, set loam cake 62 then and cover this liquid crystal panel 60 and optical sheet 30.Loam cake 62 is made for for example metallic plate of 1.5mm by thickness.In addition, though the size (with reference to Fig. 4) of the image display area 65 in should example is 1018mm * 573mm, be not limited to this size certainly, other sizes also can.Again,, the periphery of the encapsulation 16 of lamp 10 is covered as the picture frame zone, so that cannot see the position that this is not lighted from the outside for the position of not lighting of concealed hight 10.
Below with reference to Fig. 6～Fig. 8, describe for the effect of the melanism inhibition parts 50 of the existing problems under the situation of long life fluorescent lamp and this example making hot-cathode fluorescent lamp 10.
At first, in order to start hot-cathode fluorescent lamp 10, when starting, be necessary to make the temperature of filament to be in suitable temperature range.Here, so-called suitable temperature range means the hot electron of launching quantity sufficient from emitter, and the temperature range of excessive vaporization can not take place again emitter.That is to say that if be lower than suitable temperature range, then can not launch hot electron, filament is damaged during startup, melanism takes place, the lost of life.On the other hand, if be higher than suitable temperature range, then melanism takes place in the emitter excessive vaporization.In order when starting, to make filament be in suitable temperature, filament is fed electric current, with the Joule heat that is taken place it is heated.And the temperature when starting is by decision conduction time (hereinafter referred to as warm-up time) of heater current and heater current.
Fig. 6 (a)～(c) is the curve chart that schematically shows the relation between filament temperature Tf and the conduction time t.
Curve representation shown in Fig. 6 (a) is not the example of filament by the situation of certain electric current of the typical lamp (common illuminating lamp) of long-life type.Shown in Fig. 6 (a), filament temperature Tf rises along with the increase of conduction time, and thereafter, heat and filament temperature Tf that energising produces reach poised state with the heat radiation that the temperature difference between the environment temperature causes, and it is certain that temperature keeps.Here, T
UWith T
LThe upper and lower bound of representing suitable temperature range respectively.Also has the upper limit (T of suitable temperature range
U) and lower limit (T
L) the method for asking will narrate below.
Make heater current flow into filament, so that the temperature under the poised state is at the upper limit (T of suitable temperature range
U) below.Again, warm-up time, t1 utilized the lamp circuit of lamp to be set at can to make that filament temperature Tf is in T when starting
UWith T
LBetween.Under the situation of the hot-cathode fluorescent lamp that the general lighting of Fig. 6 (a) is used, t1 was approximately about 1 second.
The hot-cathode fluorescent lamp that backlight is used sometimes is coated with the emitter of Duoing than typical fluorescent lamp for life-saving on filament.Therefore the thermal capacitance quantitative change of filament is big, and shown in Fig. 6 (b), the temperature T f of filament becomes slowly with the variation of filament conduction time, compares with the situation of Fig. 6 (a), and warm-up time, t1 was elongated.That is to say, use the lamp of the big filament of this thermal capacity, its warm-up time, t1 was elongated, so start-up time is elongated.
In the hot-cathode fluorescent lamp that the backlight of the example shown in Fig. 6 (c) presentation graphs 6 (b) is used, the relation under the situation of increasing heater current.Shown in Fig. 6 (c),, then can shorten t1 warm-up time if strengthen heater current.But under conduction time long situation, filament temperature Tf is higher than suitable temperature range, therefore owing under the elongated situation of reason t1 such as deviation, melanism will take place.
Situation about also starting once again immediately when turning off the light with reference to Fig. 7 (a)～(c) below, just the situation that the initial stage filament temperature is high describes.Also have, Fig. 7 (a)～(c) is corresponding to the condition of the lamp of Fig. 6 (a)～(c) expression.
Curve shown in Fig. 7 (a) forms the curve shown in Fig. 6 (a) basically and is moved to the left the shape that initial temperature difference share obtains owing to initial stage filament temperature height.Here, warm-up time, t1 was by the decision of the lamp circuit of lamp, (Fig. 6 (a)) when therefore starting, when restarting (Fig. 7 (a)) all identical.From Fig. 7 (a) as can be known, lamp is started.And also the same under the situation of Fig. 7 (b) with Fig. 7 (a), also can start when restarting in suitable temperature range.But, under the situation of Fig. 7 (c), initial stage filament temperature height, therefore warm-up time t1 filament temperature Tf be higher than suitable temperature range, therefore will be with higher probability generation melanism.
As mentioned above, be coated with in order to ensure the long-life in the hot-cathode fluorescent lamp 10 of emitter of more amount,, must strengthen heater current during preheating in order to shorten warm-up time.So shown in Fig. 8 (a), under the situation that grow warm-up time, filament temperature reaches the melanism zone.This is the illustrated situation of Fig. 6 (c), and under the situation of Qi Donging, shown in Fig. 7 (c), the problem of melanism is more remarkable once again.
On the other hand, in the hot-cathode fluorescent lamp 10 of this example, melanism is set suppresses parts 50, suppress parts 50, the time during filament pre-heating before the arrival melanism forms the zone after the thermionic emission, make glow discharge takes place between the terminal by means of this melanism.Thereby, in this example, shown in Fig. 8 (b), before the arrival melanism forms zone 51, glow discharge 52 takes place between the filament terminal.In case the glow discharge 52 between this terminal takes place, flow through discharging current between the terminal, the electric current that flows to filament does not increase, so the rising of filament temperature is inhibited.By means of this, can prevent that filament temperature Tf from reaching melanism and forming zone 51, consequently, can prevent the generation of melanism.
Utilize this melanism to suppress parts 50 and can make that the reasons are as follows of glow discharge 52 take place between terminal is described before forming zone 51 reaching melanism.
Filament during the preheating energising has the resistance corresponding with its temperature, applies voltage (filament voltage) between the filament two ends.Heater current is big more, and filament temperature is high more, and then filament voltage is high more.Therefore along with the increase of conduction time, filament temperature rose when filament was by electric current, along with the rising filament voltage of temperature uprises.When this filament voltage is higher than the discharge ionization voltage between the filament two ends, filament discharge between the two ends (glow discharge between terminal).
Filament voltage during energising is by the filament resistance and the filament temperature decision in non-when energising (during normal temperature).Under certain certain filament temperature, the high more then filament voltage of filament resistance is high more, glow discharge between easy more generation terminal.
Filament resistance during non-the energising is by the diameter and the length decision of the employed tungsten filament of filament.The diameter of tungsten filament is more little or length is long more, and then filament resistance is big more, and glow discharge between terminal is taking place under certain certain filament temperature easily.
The density decision of the electronics that exists between kind, pressure and the terminal of discharge ionization voltage by the gas of enclosing in the interval at filament two ends, the lamp.The electronics that exists between terminal is the hot electron from emitter, and filament temperature is high more, and then electron density is big more.The filament two ends are more little at interval, and the pressure of the gas of inclosure is low more, or filament temperature high more (electron density is big more), and then discharge ionization voltage descends more, and the glow discharge between terminal takes place easily.
By suitable adjustment above-mentioned parameter, can make at desirable filament temperature glow discharge takes place between the terminal.
The filament 14 of this example forms the quadruple coil in order to adhere to more emitter.The quadruple coil is that the number of turn of four coilings is the quadruple coil of 4 circles, the filament coiling is formed a heavy coil, again this heavy coil secondary coiling is formed double coil, and then should form triple coil by three coilings of two-fold coil, the formation of again this triple coil being reeled for four times.Then, make it connect the hollow space that this is once reeled at the hollow space configuration main line of once reeling.
Respectively being of a size of of quadruple coil, main line diameter Da is 90 microns, by-pass diameter Db is 20 microns, and one time axle diameter MD1 is 90 microns, and a spacing (pitch) length P1 is 89 microns, secondary axle diameter MD2 is 200 microns, secondary gap length P2 is 381 microns, and three times axle diameter MD3 is 398 microns, and three times gap length P3 is 710 microns, four times axle diameter MD4 is 1200 microns, and four times gap length P4 is 1800 microns.
The hot-cathode fluorescent lamp 10 of this example is the lamp that possesses the filament 14 of this quadruple coil, supports the interval of the lead-in wire 13 of filament to take 12mm, and the gas of inclosure adopts the mist of the 600Pa of 50% argon gas and 50% krypton gas.
Adopt the generation of glow discharge between the lamp research terminal of this structure, what obtain the results are shown in Fig. 9～Figure 11.Its content will be narrated below, from Fig. 9～Figure 11 as can be known, arrive melanism at filament temperature and will form before regional 55, and glow discharge 52 takes place between terminal.Voltage between the terminal when at this moment, glow discharge 52 takes place between described terminal is 14.5～15.5V.By means of this, can suppress the rising of filament temperature, can suppress melanism.Also have, if adjust above-mentioned parameter suitable, glow discharge 52 (can realize that promptly melanism suppresses parts 50) then is not limited to the quadruple coil, even also can take place the coil of other structures (for example triple coil) between terminal before the arrival melanism forms zone 51.
The method of asking to filament temperature Tf describes below.Directly measuring filament temperature is inconvenient technically, therefore utilizes the following stated method to ask filament temperature.Filament temperature can utilize the temperature characterisitic of the resistance of the tungsten filament that constitutes filament to try to achieve.Here, filament temperature in the time of will heating respectively and filament resistance are designated as Th (K), Rh (Ω) (" h " is the meaning of " heat "), on the other hand, filament temperature during with room temperature and filament resistance are designated as Tc (K), Rc (Ω) (" c " is the meaning of " cold ") respectively, rule of thumb as can be known, these parameters have relation described below.
Th=Tc * (Rh/Rc)
0.814(formula 1)
According to top described formula, when measuring room temperature and the filament resistance during heating, can obtain filament temperature.
Below to suitable temperature upper limit (T
U) the method for asking describe.At first, the upper limit of so-called suitable temperature when starting preheating is meant the ceiling temperature of the situation of dimization that excessive vaporization that emitter does not take place causes, and the upper limit of the temperature that this is suitable can utilize the following stated method to try to achieve.
On the filament of resistance R c when having measured room temperature in advance, with predetermined current energising 1 minute.When carrying out this energising, measure the voltage and current of filament, the filament resistance Rh when calculating heating.The energising visual judgement in back has or not the melanism that lamp takes place.Slowly improve heater current then, go out to ask the upper limit of the heater current that melanism takes place.Also have, the upper limit of suitable temperature is subjected to the parameter influence of the diameter of the shape of coil, lamp, the gas of inclosure etc., so each lamp is got different numerical value.
Also have, the judgement of melanism simply, is carried out with visual means, and judges just enoughly often like this, and tight judgement can be carried out with the color colour difference meter that reflected colour is measured usefulness.The color colour difference meter is the determinator of the color when shining standard light on object, utilizes this mensuration can access colourity x, y and the lightness Y of reflected colour.Lightness Y represents this reflected by objects rate, therefore can represent the degree (melanism degree) of melanism with this lightness.
The lower limit T of the suitable temperature during below to startup
LThe method of asking describe.At first, the lower limit of so-called suitable temperature when starting preheating is meant, launches the thermionic lower limit temperature of quantity sufficient from being held in emitter on the filament, and the temperature that this is suitable following limits the use of method as described below and try to achieve.
Make filament be in cathode side, make lamp carry out direct-current discharge with certain Weak current (0.6mA) as determination object.Making it is for fear of the heating of lamp current to filament with small current discharge.Under the state of keeping this discharge (lamp current), filament is fed certain electric current, measure modulating voltage and filament voltage after energising over time.
An example with its result illustrates with Fig. 9 below.Lamp voltage change when the line among Fig. 9 (B) indication lamp starts.Modulating voltage sharply descend (arrow 56) in 1.7 seconds～2.5 seconds conduction time in online as can be known (B).This is that cathode drop reduces because the filament heating makes hot electron be launched out.The filament temperature that modulating voltage reduces the about 2.5 seconds point (symbol 57) that gets off is the lower limit of suitable temperature.
Resistance ratio (Rh/Rc) when the line among Fig. 9 (A) expression starts over time, and is substantially the same with the curve shown in Fig. 8 (b).As can be seen from Figure 9, (57) arrive the situation that glow discharge 52 takes place before the border that melanism forms zone 51 (being the upper limit of suitable temperature) 55 after line (A) the expression thermionic emission.In other words, utilize this glow discharge 52, form melanism take place in zone 51 distribution maps (profile) and do not enter melanism and form zone 51, consequently, suppressed the melanism of hot-cathode fluorescent lamp 10 if make not this glow discharge 52 just enter melanism.Also have, the border (upper limit 55 of suitable temperature) that the melanism of this lamp 10 forms zone 51 is that resistance ratio (Rh/Rc) is 6.9 place.
As Fig. 9～shown in Figure 11, whether whether glow discharge 52 takes place between terminal can be judged according to discontinuity point.This is further specified as follows.At first, in case to the filament energising, the temperature of filament rises, so the resistance of coil uprises.Therefore resistance ratio (Rh/Rc) (or filament voltage Vf) rises.Between terminal in case glow discharge 52 takes place, then between terminal except heater current, also have glow current to flow, therefore discontinuity point takes place in the apparent resistance step-down between terminal in the variation of resistance ratio (Rh/Rc) (or filament voltage Vf).Thereby, can whether judge the generation of glow discharge 52 between terminal according to discontinuity point.
More than utilize desirable example to describe the present invention, but such record is not to limit item, and various changes are certainly arranged.
For example the section of the fluorescent tube 12 of hot-cathode fluorescent lamp 10 is not limited to circle (or circular), also can adopt section to be roughly the fluorescent tube of ellipse (ellipse, Long Circle, other flat patterns).And the backlight of example of the present invention is fit to be used in for example big picture liquid crystal TV set more than 32 inches as mentioned above, but is not limited thereto, and also can be used in the liquid crystal TV set of medium-sized (for example 26 inches～14 inches).And be not limited to liquid crystal TV set, and also can be used in the backlight of other image display devices (particularly big picture is used), perhaps also can be used in the backlight of billboard.
Also have, in above-mentioned example, be that the center is illustrated with the backlight, but as described in " invention want solve problem " part, recently, illuminating hot-cathode fluorescent lamp also has the trend of long lifetime, the same with backlight when reaching the long-life of nominal life-span more than 20,000 hours, long problem start-up time before light the same with above-mentioned backlight will take place.By the present invention also being used in the above-mentioned illumination hot-cathode fluorescent lamp that the nominal life-span more than 20,000 hours is arranged, can access the same with the result of the research of carrying out with above-mentioned backlight, the effect that can shorten start-up time.
Also have, basically the structure with the above-mentioned hot-cathode fluorescent lamp that is used in backlight is identical with the structure of hot-cathode fluorescent lamp in illumination, and the lamp circuit that illumination is lighted with hot-cathode fluorescent lamp also has identical structure with the lamp circuit that the above-mentioned hot-cathode fluorescent lamp that is used in backlight is lighted usefulness basically.
And state in the use under the situation of the quadruple filament that illustrates in the example, the preheat curent that flows into filament adopts 800mA, can glow discharge 52 take place between terminal as Fig. 9～shown in Figure 11 making.
Glow discharge between terminal is not the discharge that the preheat curent of filament takes place when being the value of 800mA, even other current values also can take place.That is to say that to make between terminal the current value that glow discharge takes place in filament be the state, the distance between the pair of lead wires of the gas enclosed in the specification, discharge space according to filament, the time till lighting to lamp (so-called above-mentioned parameters) such as length suitably determines.
Below the benchmark of implementing when of the present invention is described.
At first, glow discharge takes place between terminal in order to make wittingly, by filament is passed to preheat curent, filament temperature is risen, the result, (specifically glow discharge then takes place in the voltage (filament voltage when between the terminal of Fig. 9～Figure 11 glow discharge taking place is roughly 15V) of 13V～17V) easily between terminal if filament applied about 15V.
Then, in order to make glow discharge takes place between terminal, as long as the resistance ratio (Rh/Rc) of filament is below 6.9 when filament voltage is 13V～17V before melanism forms the zone.
That is to say, when to adopt filament voltage be 13V～17V, the resistance ratio of filament (Rh/Rc) was the filament of the structure 6.9 below, then filament is led to preheat curent and heats, can finally to make the voltage of filament be 13V～17V as long as filament is passed to preheat curent, just can implement the present invention.
Industrial applicability
If employing the present invention is even then possess the backlight of long-life hot-cathode fluorescent lamp And lighting device, also can shorten start-up time.
Claims (16)
1. a backlight possesses hot-cathode fluorescent lamp, it is characterized in that,
Described hot-cathode fluorescent lamp by the fluorescent tube that forms fluorophor at inner surface, to be arranged at described fluorescent tube inner and be coated with the filament of the thermionic emitter of emission and support the pair of lead wires of described filament to constitute,
At described hot-cathode fluorescent lamp melanism is set and suppresses parts,
Described melanism suppresses the parts utilization makes the filament that glow discharge takes place between the terminal realize between described pair of lead wires between a period of time before the arrival melanism forms the zone after the described thermionic emission when described filament pre-heating.
2. backlight according to claim 1 is characterized in that,
Described backlight also possesses lamp circuit,
Described lamp circuit flows through the filament preheating circuit of preheat curent and provides the lamp power supply circuit of electric power to constitute when described hot-cathode fluorescent lamp is lighted by making when the described filament pre-heating.
3. backlight according to claim 1 is characterized in that,
Described backlight be under the backlight of device used for image display of type.
4. backlight according to claim 1 is characterized in that,
Described hot-cathode fluorescent lamp is to be the fluorescent lamp more than 50,000 hours in the nominal life-span.
5. backlight according to claim 1 is characterized in that,
The above emitter of coating 10.0mg on the described filament of an electrode in the pair of electrodes in of described hot-cathode fluorescent lamp.
6. backlight according to claim 1 is characterized in that,
Described filament is made of the quadruple coil.
7. a startup method that possesses the backlight of hot-cathode fluorescent lamp is characterized in that,
When the filament pre-heating that described hot-cathode fluorescent lamp has, between a period of time before the arrival melanism forms the zone after the thermionic emission, between the pair of lead wires of supporting described filament, make glow discharge takes place between the terminal, suppress the generation of the melanism of described hot-cathode fluorescent lamp by means of this.
8. the startup method of backlight according to claim 7 is characterized in that,
Described hot-cathode fluorescent lamp is to be the lamp more than 50,000 hours in the nominal life-span.
9. nominal life-span is the hot-cathode fluorescent lamp more than 20,000 hours, it is characterized in that,
Described hot-cathode fluorescent lamp by the fluorescent tube that forms fluorophor at inner surface, to be arranged at described fluorescent tube inner and be coated with the filament of the thermionic emitter of emission and support the pair of lead wires of described filament to constitute,
At described hot-cathode fluorescent lamp melanism is set and suppresses parts,
Described utilization makes the filament that glow discharge takes place between the terminal realize between described pair of lead wires between a period of time before the arrival melanism forms the zone after the described thermionic emission when described filament pre-heating.
10. hot-cathode fluorescent lamp according to claim 9 is characterized in that,
Described hot-cathode fluorescent lamp is illuminating.
11. hot-cathode fluorescent lamp according to claim 9 is characterized in that,
Described hot-cathode fluorescent lamp is to be the lamp more than 50,000 hours in the nominal life-span.
12. hot-cathode fluorescent lamp according to claim 9 is characterized in that,
The above emitter of coating 10.0mg on the described filament of an electrode in the pair of electrodes in of described hot-cathode fluorescent lamp.
13. hot-cathode fluorescent lamp according to claim 9 is characterized in that,
Described filament is made of the quadruple coil.
14. a lighting device that possesses hot-cathode fluorescent lamp and described hot-cathode fluorescent lamp is characterized in that,
Described hot-cathode fluorescent lamp is the described hot-cathode fluorescent lamp of claim 9,
Described lamp circuit flows through the filament preheating circuit of preheat curent and provides the lamp power supply circuit of electric power to constitute when described hot-cathode fluorescent lamp is lighted by making when the described filament pre-heating.
15. the startup method of a hot-cathode fluorescent lamp is to be the startup method of the hot-cathode fluorescent lamp more than 20,000 hours in the nominal life-span, it is characterized in that,
When the filament pre-heating that described hot-cathode fluorescent lamp has, between a period of time before the arrival melanism forms the zone after the thermionic emission, between the pair of lead wires of supporting described filament, make glow discharge takes place between the terminal, suppress the generation of the melanism of described hot-cathode fluorescent lamp with this.
16. the startup method of hot-cathode fluorescent lamp according to claim 15 is characterized in that,
Described hot-cathode fluorescent lamp is to be the lamp more than 50,000 hours in the nominal life-span.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007119438 | 2007-04-27 | ||
| JP119438/2007 | 2007-04-27 |
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| CN200880013479A Pending CN101669190A (en) | 2007-04-27 | 2008-04-25 | Long-life hot-cathode fluorescent lamp, backlight or illuminator, having the long-life hot-cathode fluorescent lamp, and its start-up method |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPWO2008139711A1 (en) |
| KR (1) | KR20090096631A (en) |
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| JPS6030043A (en) * | 1983-07-29 | 1985-02-15 | Matsushita Electric Works Ltd | Electrode for low pressure electric-discharge lamp |
| JPH0224952A (en) * | 1988-07-13 | 1990-01-26 | Tokyo Densoku Kk | Cold cathode tube for light emitting device |
| JPH06283134A (en) * | 1993-03-29 | 1994-10-07 | Toshiba Lighting & Technol Corp | High-frequency-lighted fluorescent lamp, its lighting device, and starting method |
| JP4110444B2 (en) * | 2001-10-25 | 2008-07-02 | 東芝ライテック株式会社 | Discharge lamp device and lighting device |
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- 2008-04-25 KR KR1020097014983A patent/KR20090096631A/en not_active Application Discontinuation
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| WO2008139711A1 (en) | 2008-11-20 |
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