WO2007004464A1 - Lampe à décharge, unité de rétroéclairage, et affichage à cristaux liquides - Google Patents

Lampe à décharge, unité de rétroéclairage, et affichage à cristaux liquides Download PDF

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Publication number
WO2007004464A1
WO2007004464A1 PCT/JP2006/312769 JP2006312769W WO2007004464A1 WO 2007004464 A1 WO2007004464 A1 WO 2007004464A1 JP 2006312769 W JP2006312769 W JP 2006312769W WO 2007004464 A1 WO2007004464 A1 WO 2007004464A1
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WO
WIPO (PCT)
Prior art keywords
protective film
glass container
external electrode
discharge lamp
lamp according
Prior art date
Application number
PCT/JP2006/312769
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English (en)
Japanese (ja)
Other versions
WO2007004464A8 (fr
Inventor
Toshihiro Terada
Shingo Tsutsumi
Hideki Wada
Tomokazu Matsuura
Original Assignee
Matsushita Electric Industrial Co., Ltd.
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.)
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Application filed by Matsushita Electric Industrial Co., Ltd. filed Critical Matsushita Electric Industrial Co., Ltd.
Priority to JP2007523945A priority Critical patent/JPWO2007004464A1/ja
Publication of WO2007004464A1 publication Critical patent/WO2007004464A1/fr
Publication of WO2007004464A8 publication Critical patent/WO2007004464A8/fr

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Classifications

    • 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
    • H01J61/35—Vessels; Containers provided with coatings on the walls thereof; Selection of materials for the coatings
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133604—Direct backlight with lamps
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
    • H01J1/54—Screens on or from which an image or pattern is formed, picked-up, converted, or stored; Luminescent coatings on vessels
    • H01J1/62—Luminescent screens; Selection of materials for luminescent coatings on vessels
    • H01J1/70—Luminescent screens; Selection of materials for luminescent coatings on vessels with protective, conductive, or reflective layers
    • 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
    • H01J61/34—Double-wall vessels or containers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J65/00—Lamps without any electrode inside the vessel; Lamps with at least one main electrode outside the vessel

Definitions

  • Discharge lamp, backlight unit, and liquid crystal display device Discharge lamp, backlight unit, and liquid crystal display device
  • the present invention relates to a discharge lamp, a knock light unit, and a liquid crystal display device, and more particularly, to a discharge lamp having an external electrode disposed on the outer surface of a glass container.
  • the external electrode type fluorescent lamp is suitable for small diameter lamps as compared with the hot cathode fluorescent lamp, like the cold cathode fluorescent lamp. For this reason, it is preferably used as a light source of a backlight unit that is required to be thin (downsized).
  • the backlight unit can be roughly divided into an edge light system in which a light guide plate is placed on the back surface of the LCD panel, and a fluorescent lamp is disposed on the end surface of the light guide plate, and a plurality of fluorescent lamps on the back surface of the LCD panel.
  • the edge light method is excellent in thinning and luminance uniformity of the light emitting surface, but it is disadvantageous in terms of high luminance, while the direct method is superior in terms of high luminance, but thin. It can be said that it is disadvantageous in terms of conversion.
  • the LCD system used in a liquid crystal television set with an emphasis on high brightness often employs a direct method.
  • a cold cathode fluorescent lamp is used as the light source for the direct-type backlight unit, one high-frequency lighting circuit (inverter) is required for each cold negative fluorescent lamp, leading to increased costs.
  • an external electrode fluorescent lamp that emits light by dielectric barrier discharge by providing external electrodes on the outer circumferences of both ends of a tubular glass container and using the glass tube wall as a capacitance has been actively developed. Since the external electrode fluorescent lamp itself has a capacitance, it can be used to light a large number of lamps with one inverter.
  • Patent Document 1 Japanese Unexamined Patent Publication No. 2003-17005
  • Patent Document 2 Japanese Patent Laid-Open No. 11-354079
  • the present invention provides a discharge lamp capable of suppressing the occurrence of defects such as perforation as much as possible even when the luminance is improved by increasing the drive current, and the like. And a liquid crystal display device having the backlight unit.
  • a discharge lamp according to the present invention includes a glass container, an external electrode disposed on a part of the outer surface of the glass container, and at least a portion facing the external electrode.
  • a discharge lamp according to the present invention includes a glass container, an external electrode disposed on a part of the outer surface of the glass container, and at least a portion facing the external electrode.
  • the average cross-sectional area per hole is 0.1 ⁇ m 2 or less
  • an alkali metal compound is dispersed in the protective film.
  • the alkali metal compound is a cesium compound, and the surface roughness of the protective film is 0.6 ⁇ m or more.
  • an alkaline earth metal compound is dispersed in the protective film, and the metal oxide particles have yttrium oxide force.
  • the glass container is made of glass containing sodium oxalate in a range of 5% to 20%, and the inner surface of the glass container has a region where the protective film is not formed. A part of the external electrode is formed on the outer surface of the glass container facing the region.
  • the external electrode is characterized in that the thickness in the vicinity of the end portion is gradually reduced gradually toward the end portion.
  • the external electrode is characterized by comprising a solder layer formed in a region subjected to a roughening treatment on the outer surface of the glass container.
  • a backlight unit includes the above-described discharge lamp as a light source.
  • the backlight unit includes an envelope that houses a plurality of the discharge lamps, and a liquid crystal display panel;
  • the above-mentioned backlight unit is provided on the back surface of the liquid crystal display panel.
  • the average film thickness of the protective film made of an aggregate of metal oxide particles is set to 2 m or less, so that the luminance decreases when the protective film thickness is increased. It can be suppressed as much as possible, and the surface roughness of the protective film is 1. or less, and the denseness of the protective film has been improved, so even if the brightness is improved by increasing the drive current, etc. The occurrence of problems such as these can be suppressed as much as possible.
  • the average thickness of the protective film made of an aggregate of metal oxide particles is as follows, and per closed hole that is an internal void in the protective film: Since the average cross-sectional area is set to 0 .: L m 2 or less, the same effect as described above can be obtained.
  • the alkali metal oxide is dispersed in the protective film, good dark startability can be obtained.
  • a cesium compound is used as the alkali metal oxide and the surface roughness of the protective film is 0.6 m or more, good dark startability can be obtained more reliably.
  • the metal oxide particles forming the protective film are made of yttrium oxide, adsorption of mercury by the protective film is reduced, and unnecessary consumption of mercury can be suppressed.
  • the glass container is made of glass containing sodium oxalate in a range of 5% or more and 20% or less, and an outer surface portion of the glass container facing a region where the protective film is not formed on the inner surface of the glass container.
  • a part of the external electrode is formed, so that the dark startability is improved.
  • the thickness of the external electrode is gradually reduced gradually toward the end, the corona discharge generated at the end of the external electrode is prevented, and the generation of ozone is prevented. It can be suppressed.
  • the external electrode is composed of a solder layer formed in the roughened surface of the outer surface of the glass container, a discharge lamp having an external electrode with high adhesion strength to the outer surface of the glass container is used. It is out. [0017] Further, since the external electrode includes a metal sleeve extrapolated to the glass container and solder filled between the metal sleeve and the outer peripheral surface of the glass container, the external electrode is connected to the apparatus. It is possible to reduce damage to the external electrode that tends to occur when the socket is attached to or detached from the socket.
  • the backlight unit and the liquid crystal display device since the discharge lamp is provided, the temperature of the external electrode The rise can be suppressed, and discoloration due to thermal degradation of the other member constituting the knocklight unit, which is in the vicinity of the external electrode, can be suppressed.
  • FIG. 1 is a half sectional view showing a schematic configuration of an external electrode fluorescent lamp according to an embodiment.
  • FIG. 2 is an electron micrograph showing a cross section of a protective film in a comparative fluorescent lamp.
  • FIG. 3 is a graph showing experimental results of examining the relationship between drive current and electrode temperature for a comparative fluorescent lamp and an example fluorescent lamp.
  • FIG. 4 is a diagram schematically showing a cross section of a protective film.
  • FIG. 5 is an electron micrograph showing a cross section of a protective film in an example fluorescent lamp.
  • FIG. 6 is a diagram for explaining a method of forming a protective film in relation to the method of manufacturing the external electrode fluorescent lamp according to the embodiment.
  • FIG. 7 is a diagram showing the results of a test relating to the dark start rate.
  • FIG. 8 is an electron micrograph of a cross section of a protective film in one of the external electrode fluorescent lamps used in an experiment relating to dark startability.
  • FIG. 9 is an electron micrograph of a cross-section of a protective film in one of the external electrode fluorescent lamps used in an experiment relating to dark startability.
  • FIG. 10 is a perspective view showing a schematic configuration of a backlight unit according to the embodiment.
  • FIG. 11 is a block diagram of the backlight unit.
  • FIG. 12 is a diagram showing a schematic configuration of a liquid crystal television using the backlight unit according to the embodiment.
  • FIG. 13 is a view showing a modification of the external electrode.
  • FIG. 14 is a view showing a modification of the external electrode.
  • FIG. 15 is a diagram showing a schematic configuration of an external electrode fluorescent lamp according to a modification.
  • FIG. 16 is a diagram showing a schematic configuration of an external electrode fluorescent lamp according to another modification.
  • FIG. 1 is a half sectional view showing a schematic configuration of an external electrode fluorescent lamp 10 (hereinafter simply referred to as “fluorescent lamp 10”) according to an embodiment.
  • fluorescent lamp 10 an external electrode fluorescent lamp 10
  • FIGS. 1, 6, and 10 to 16 the scales between the constituent members are not unified.
  • the fluorescent lamp 10 has a glass container 12 in which both ends of a glass tube made of borosilicate are hermetically sealed.
  • the total length L1 of the glass container 12 is 740 mm, the outer diameter is 4. Omm, and the inner diameter is 3. Omm.
  • a first external electrode 14 and a second external electrode 16 are formed on the outer periphery of both end portions of the glass container 12.
  • the first external electrode 14 has a two-layer structure. Of the two layers, the one closer to the glass container 12 is a silver (Ag) paste film 14A, and the farther one is a lead (Pb) -free solder film 14B.
  • the second external electrode 16 also has a two-layer structure in which a silver (Ag) paste film 16A and a lead (Pb) free solder film 16B are laminated in this order from the glass container 12 side.
  • the protective film 18 is made of an aggregate of metal oxide particles.
  • YO yttrium oxide
  • metal oxide for example, alumina (Al 2 O 3)
  • the protective film does not necessarily have to be formed over almost the entire length as in the illustrated example, and is formed at least on the inner peripheral surface portion of the glass container 12 facing the first and second external electrodes 14, 16. I don't mind. Details of the protective film 18 will be described later.
  • a phosphor film 20 is formed by being laminated inside the protective film 18.
  • the formation range of the phosphor film 20 in the longitudinal direction of the glass container 12 is between the first external electrode 14 and the second external electrode 16.
  • a part of the phosphor film 20 may be applied to the inner peripheral surface portion of the glass container 12 facing the first external electrode 14 and the second external electrode 16.
  • the phosphor film 20 includes three kinds of rare earth phosphors of red (R), green (G), and blue (B), and emits white light as a whole.
  • green phosphor (LaPO: Ce, Tb) green phosphor
  • blue phosphor BaMg Al
  • a predetermined amount of mercury and a mixed rare gas having a predetermined pressure are enclosed in the glass container 12.
  • a neon argon mixed gas (Ne90% + ArlO%) of about 7 kPa (20 ° C) is enclosed as a rare gas mixture with a mercury power of about 2000 g!
  • the fluorescent lamp 10 having the above-described constituent power
  • a high frequency voltage is applied to the first and second outer electrodes 14 and 16 by the inverter
  • a discharge phenomenon occurs in the hermetic sealed space (discharge space) in the glass 12.
  • ultraviolet rays are emitted, and the ultraviolet rays are converted into visible light by the phosphor film 20 and emitted outside the glass container 12.
  • the inverter for example, an inverter having a maximum applied voltage of 2.5 kV and an operating frequency of 60 kHz can be used.
  • the above discharge is an dielectric barrier discharge.
  • the dielectric barrier discharge is a discharge in which the discharge space is surrounded by the dielectric (glass container 12) and the electrode is not directly exposed to the plasma.
  • the inner peripheral portion of the glass container mainly corresponding to the region where the external electrode is disposed is composed of mercury ions, neon ions, and argon ions (hereinafter referred to as these). When collectively said, it is simply called “ion”). Therefore, the protective film 18 is provided for the purpose of protecting the impact container and the glass container.
  • an external electrode fluorescent lamp used in a knocklight unit is generally lit with a drive current of about 4 to 4.5 mA.
  • a drive current of about 4 to 4.5 mA.
  • the current value of the drive current is increased or the glass container is made thinner, The temperature of the external electrode rose and reached around 140 ° C, causing a thermal runaway, which will be described later, and pinholes were observed to appear sharply in the glass container.
  • Figure 2 shows a photomicrograph of the cross section of the protective film of the external electrode fluorescent lamp (hereinafter referred to as “comparative fluorescent lamp”) where this phenomenon occurs.
  • Both (a) and (b) are cross sections of the portion corresponding to the external electrode, (a) corresponds to one external electrode, and (b) corresponds to the other external electrode. The reason why the thickness of the protective film is different between (a) and (b) will be described later.
  • the protective film is formed by agglomeration of metal oxide particles, the protective film is not completely packed with metal oxide particles, and the protective film communicates with the outer surface. It has an open hole and a closed hole that is an internal space. As shown in Fig. 2, it is considered that the higher the number of open holes and the smaller the number of open holes, the higher the probability of receiving an impact on the inner wall force of the glass container.
  • Increasing the drive current value increases the temperature of the external electrode.
  • the temperature of the external electrode rises, the temperature of the glass container part in contact with it rises, the dielectric loss of the glass increases, and the temperature rises further.
  • the temperature of glass containers rises due to ion bombardment. To do. Due to the electronegativity, ions collide with the glass rather than collide with the protective film, resulting in greater energy loss and greater heat generation.
  • electrode temperature the temperature at the electrode (hereinafter referred to as "electrode temperature”) reached about 140 ° C, thermal runaway occurred and pinholes suddenly appeared in the glass container.
  • Fig. 3 shows the relationship between the drive current value and the electrode temperature in the comparative fluorescent lamp.
  • the electrode temperature was measured with a radiation thermometer.
  • a broken line shows a comparative fluorescent lamp.
  • the electrode temperature is less than 80 ° C, and there is no problem of pinholes due to thermal runaway.
  • it may be lit at a drive current of about 8 mA, and in the future it is planned to illuminate at 10 mA. In this case, the pinhole due to the thermal runaway becomes a problem.
  • the inventors of the present invention solves the problem of pinholes by further improving the denseness of the protective film, thereby suppressing the collision of ions with the inner wall of the glass container and thereby suppressing the amount of heat generated in the part. It was decided.
  • the denseness of the protective film was evaluated using the following indices.
  • FIG. 4 is a diagram schematically showing a cross section of the protective film.
  • the reference numeral 22 indicates metal oxide particles
  • the reference numeral 24 indicates closed pores serving as internal voids.
  • the surface roughness appearing in the cross section of the protective film was measured, and the measured value was used as one of the indicators showing the denseness of the protective film. It can be said that the smaller the surface roughness is, the smaller the pores communicating with the outer surface in the protective film are.
  • the surface roughness is the “maximum height Ry” measured according to JIS B 0601: '94.
  • the area of each cross section of the closed holes 24 serving as internal voids is measured and averaged, and the average value (hereinafter simply referred to as "closed hole area"). ) was taken as another indicator of compactness.
  • the closed hole is in the cross section of the protective film.
  • the voids are enough to contain at least 1.0 metal oxide particles having an average particle diameter.
  • the closed hole is not completely closed by the wall formed by the metal oxide particle group, but the wall is converted to the size of the metal oxide particle having an average particle diameter. There may be 4.0 or less discontinuous portions.
  • the number of closed holes per unit cross-sectional area of the protective film (hereinafter simply referred to as “the number of closed holes”) was also used as an indicator of denseness.
  • the electrode temperature is about 120 ° C (when 10 mA is lit). This is a temperature value in which the 140 ° C force in question is sufficiently suppressed.
  • the electrode temperature can be suppressed to 120 ° C about (at 10mA lit) However, it was divided. Further, in this case, (if four Z mu m 2 or less) number closed pores four Z mu m 2 and unless exceeded, the electrode temperature can be suppressed to about 120 ° C (at 10mA lit) However, it was divided.
  • FIG. 5 shows one of the external electrode fluorescent lamps used in the experiment, and is a cross-sectional microscope of the protective film in the external electrode fluorescent lamp according to the example (hereinafter referred to as “Example fluorescent lamp”). It is a photograph.
  • (A) is a partial cross-section of the protective film corresponding to the first external electrode (hereinafter referred to as “first part”), and
  • (b) is a part of the protective film corresponding to the second external electrode. It is a cross section (hereinafter referred to as “second part”).
  • Example fluorescent lamp the surface roughness of the first portion 0. 05 ⁇ m, closed pore area 0. 008 ⁇ m 2, closed pore number 1.
  • the average particle diameter of the metal oxide particles in the example fluorescent lamp was 0.113111 in the first part and 0.12 / zm in the second part.
  • the example fluorescent lamp can suppress the electrode temperature more than the comparative fluorescent lamp if the magnitude of the drive current is the same.
  • the electrode loss is reduced as the calorific value of the electrode portion decreases, and as a result, the power consumption can be reduced.
  • a suspension 32 containing metal oxide particles is adhered to the inner surface of a glass tube 30 that is a material of the glass container 12 (FIG. 1).
  • a tank 34 containing a suspension 32 is prepared.
  • the suspension 32 is obtained by adding a predetermined amount of metal oxide particles and -trocellulose (NC) as a thickener in butyl acetate as an organic solvent.
  • NC metal oxide particles and -trocellulose
  • the glass tube 30 is held vertically and held at a lower end portion immersed in the suspension 32.
  • the suction force of a vacuum pump (not shown)
  • the upper end force of the glass tube 30 is also evacuated from the glass tube 30, and the suspension 32 is sucked up by making the inside of the glass tube 30 a negative pressure [step A].
  • the suction is stopped and the glass tube 30 is pulled up from the suspension 32.
  • the suspension 32 adheres in a film form to a predetermined region on the inner periphery of the glass tube 30.
  • the thickness of the suspension 32 becomes thicker toward the lower part than the upper part. This is why the thickness of the protective film was different between (a) and (b) in the photographs in Figs.
  • step B Next, while the glass tube 30 held vertically is rotated around the tube axis, the suspension 32 adhering to the film is dried [step B]. At this time, centrifugal force acts on each metal oxide particle in the direction toward the inner wall of the glass tube. As a result, the metal oxide particles clog toward the inner wall of the glass tube, and the final protective film is denser than when no centrifugal force is applied (when the glass tube is not rotated). Will be improved. In this case, the denseness of the protective film finally obtained can be changed (adjusted) depending on the rotation speed and the viscosity of the suspension (fluidity of the metal oxide particles in the suspension). Optimum values for the number of rotations and the viscosity of the suspension can be obtained by trial and error through experiments.
  • the inventor of the present application has developed a fluorescent lamp with improved dark startability which is particularly required when used as a light source of a backlight unit, as will be described later.
  • a cesium (Cs) compound was mixed with the suspension to form a protective film.
  • the dark startability is improved by dispersing a cesium (Cs) compound having a low electronegativity in the protective film.
  • the mixing ratio of the cesium compound in the suspension was 0.60% by weight or less in this example.
  • the mixing ratio of the cesium compound in the suspension for forming the protective film is preferably 0.65% by weight or less, more preferably 0.60% by weight or less.
  • the inventor of the present application creates a lamp (lamp A, B, C, D) in which a cesium compound is dispersed in a protective film based on the fluorescent lamp 10, and confirms the effect of dark startability. I went. For comparison, a lamp X that does not disperse the cesium compound in the protective film was made and a similar experiment was conducted.
  • Lamps A, B, C, D, and X have basically the same configuration except that the cesium compound is present in the protective film and the type and mixing ratio are different.
  • W1 (Fig. 1) is 40mm longer than other lamps.
  • lamps A, B, C, and D the types of cesium compounds mixed in the protective film and the mixing ratio (wt% in the suspension) are as follows.
  • Lamp A cesium sulfate (Cs SO), mixing ratio: 0. 60 weight 0/0
  • Lamp B Shioi ⁇ cesium (CsCl)
  • the mixing ratio 0. 37 wt 0/0
  • Lamp C Shioi ⁇ cesium (CsCl)
  • the mixing ratio 0. 60 weight 0/0 lamp D ... cesium sulfate (Cs SO ), mixing ratio: 0. 37 wt 0/0
  • dark start rate Is the percentage obtained by dividing the number of passing lights by the number of specimens (20 in this example), with those that turned on within 1 second from the start of power supply to both external electrodes passed and those that were not passed passed.
  • the lamps A, B, C, and D have an improved dark start rate compared to the comparative lamp X. Above all, since the dark start rate of lamps A and D is 100% in any standing time, cesium sulfate is considered to be excellent in improving the dark startability among cesium compounds.
  • the present inventor has defined a range of the surface roughness of the protective film suitable for improving the dark startability. As described above, it is better to make the protective film as dense as possible in order to solve the pinhole problem. However, the inventors of the present invention have found through experiments that satisfactory dark startability cannot be obtained if the protective film is made dense beyond a certain limit. This is presumed to be due to the following reason.
  • the cesium compound is considered to be substantially uniformly dispersed on the surface of the protective film and in the inside thereof.
  • the cesium compound that is in direct contact with the discharge space is considered to contribute to the improvement of the dark start. That is, it is considered that the cesium compound mainly present on the surface of the protective film contributes to the improvement of the dark start.
  • the denser the protective film the flatter the surface of the protective film (that is, the smaller the surface roughness) and the smaller the surface area of the protective film. Less cesium compounds are present on the surface (ie, directly in contact with the discharge space). As a result, the dark startability is degraded.
  • the inventors of the present application obtained an experiment to determine the surface roughness (the “maximum height Ry”) that can solve the problem of pinholes while satisfying the dark startability.
  • Cs SO cesium
  • a suspension was made.
  • the mixing ratio of yttrium oxide is 10 wt%
  • the mixing ratio of the cesium sulfate is 0.5 wt 0/0.
  • FIG. 8 is a photomicrograph of the cross section of the protective film in one of the external electrode fluorescent lamps used in the experiment.
  • the lamp shown in Fig. 8 has a dark start rate of 70%, but has failed in terms of the dark start rate, although the pinhole problem has been solved.
  • the surface roughness (maximum height Ry) of the protective film in the lamp shown in FIG. 8 was 0.43 ⁇ m.
  • Figure 9 is a photomicrograph of the cross section of the protective film in another external electrode fluorescent lamp used in the experiment.
  • the lamp shown in Fig. 9 eliminates the pinhole problem and starts dark. The rate was also 100%.
  • the fluorescent lamp 10 according to the above embodiment is used as a light source of a knocklight unit.
  • any one of the lamps A, B, C, and D may be used as the light source.
  • FIG. 10 is a perspective view showing a schematic configuration of a direct-type backlight unit 40.
  • FIG. FIG. 10 is a view in which a translucent plate 46 described later is broken.
  • the knock light unit 40 is arranged and used on the back of an LCD (liquid crystal display) panel (not shown in FIG. 10), and constitutes an LCD device.
  • LCD liquid crystal display
  • the knock light unit 40 includes an envelope 48 including a rectangular reflecting plate 42, a side plate 44 surrounding the reflecting plate 42, and a translucent plate 46 provided in parallel with the reflecting plate 42. Both the reflector 42 and the side plate 44 are reflective films (not shown) in which silver or the like is vapor-deposited on one main surface of the plate made of PET (polyethylene terephthalate) resin (the inner surface when assembled as the envelope 48). ) Is formed.
  • PET polyethylene terephthalate
  • the light transmissive plate 46 is formed by laminating a light diffusing plate 50, a light diffusing sheet 52, and a lens sheet 54 in this order from the reflecting plate 42 side.
  • a plurality of (in this example, 16) fluorescent lamps 10-power reflecting plates 42 are housed at equal intervals in the short side direction in parallel with the long sides. These fluorescent lamps 10 are electrically connected in parallel by a wiring member (not shown).
  • the fluorescent lamp 10 can suppress the amount of heat generated in the electrode portion more than before. As a result, it is possible to suppress discoloration (yellowing) or the like due to thermal deterioration in the vicinity of the electrode portion of the translucent plate 46 and other members constituting the envelope 48.
  • FIG. 11 is a block diagram showing the backlight unit 40 including an inverter 56 that is a power supply circuit unit for lighting the 16 fluorescent lamps 10.
  • the inverter 56 converts AC power of 50 Z 60 Hz from the commercial power source 58 into high frequency power (for example, 60 kHz as described above), and supplies the fluorescent lamp 10 with power.
  • FIG. 12 is a diagram showing the liquid crystal television 60 with a part of the front surface thereof cut away.
  • a liquid crystal television 60 shown in FIG. 12 includes a liquid crystal display panel 62, a backlight unit 40, and the like.
  • the liquid crystal display panel 62 is a color filter substrate, a liquid crystal, a TFT substrate, or the like, and is driven by a drive module (not shown) based on an external image signal to form a color image.
  • the envelope 48 of the backlight unit 40 is provided on the back surface of the liquid crystal display panel 62, and the back surface force also irradiates the liquid crystal display panel 62.
  • the inverter 56 is disposed inside the casing 64 of the liquid crystal television 60 and outside the envelope 56.
  • the present invention has been described using an example in which the present invention is applied to an external electrode type silver fluorescent lamp.
  • the present invention is not limited to a fluorescent lamp and can also be applied to an external electrode type ultraviolet lamp. It is. That is, the phosphor film may be removed from the configuration of the external electrode fluorescent lamp according to the above-described embodiment (the phosphor film is not formed) and configured as an external electrode ultraviolet lamp.
  • the ultraviolet lamp irradiates the irradiated object with ultraviolet rays and is used for sterilization of the irradiated object.
  • the external electrodes provided on the outer periphery of both ends of the glass container are not limited to those in the above-described embodiment, and may be, for example, in the following forms.
  • FIG. 13 shows an example in which the external electrode 114 is formed on the outer surface of the end portion of the glass container 112 by known ultrasonic solder dipping.
  • the area where the external electrode 112 is to be formed on the outer surface of the glass container 112 is roughened to a surface roughness of about 1 to 3 m by sandblasting, which is due to the adhesion of the solder to the glass container surface.
  • the external electrode 112 is formed by immersing the glass container 112 in the ultrasonic solder layer and pulling it up while holding the glass container 112 vertically.
  • solder material any of tin, an alloy of tin and indium, and an alloy of tin and bismuth can be used. Can be used. Further, from the viewpoint of adhesion to the glass container 112, it is preferable to contain at least one of antimony, zinc, and aluminum as an additive. Further, from the viewpoint of wettability with the surface of the glass container 112, it is preferable to contain antimony or zinc as an additive.
  • the external electrode 114 has a thickness in the vicinity of the end thereof that gradually decreases gradually toward the end. If the end of the external electrode is angular, corona discharge occurs between the end of the external electrode and the outer peripheral surface of the glass container, and ozone is generated. By adopting the shape shown in FIG. It is possible to effectively suppress the generation of corona discharge and prevent the generation of ozone.
  • reference numeral 116 indicates a phosphor film
  • reference numeral 118 indicates a protective film.
  • the protective film is formed only on the portion of the inner peripheral surface of the glass container facing the external electrode.
  • FIG. 14 (a) shows that a metal sleeve 124 as shown in FIG. 14 (b) is extrapolated to the outer periphery of the end of the glass container 122, and the metal sleeve 124 and the outer peripheral surface of the glass container 122 are Solder in between 12
  • the external electrode 128 is configured by filling 6.
  • a metal sleeve for the external electrode it is possible to reduce damage to the external electrode that tends to occur when the socket is attached to or detached from the socket of the knocklight unit (device).
  • the metal sleeve 124 is made of a material having substantially the same linear expansion coefficient as the glass container 122, for example,
  • the solder 126 may be, for example, 311- eight 8 - 01 alloy (in weight percent 311 95. 2, Ag is 3. 8, Cu is 1. The ratio of 0) composed of.
  • reference numeral 130 indicates a phosphor film
  • reference numeral 132 indicates a protective film
  • the external electrodes are provided on the outer periphery of both ends of the glass container 12.
  • “Third external electrode” may be provided.
  • the third external electrode is connected to the ground line (ie, grounded).
  • a protective film is formed on the inner surface of the glass container facing the third external electrode.
  • the present invention relates to a fluorescent lamp provided with external electrodes at both ends of a glass container.
  • the electrode on one end side of the glass container 70 is an external electrode 72, and the electrode on the other end side is in the glass container 70.
  • the present invention can also be applied to a fluorescent lamp 76 configured as an internal electrode 74 to be installed.
  • the end of the glass container 70 on the side where the internal electrode 74 is disposed is sealed with a lead wire 78 and hermetically sealed.
  • the internal electrode 74 is bonded to the inner end of the glass container 70 of the lead wire 78.
  • the lead wire 78 is made of tungsten wire.
  • the internal electrode 74 is a so-called hollow-type electrode having a bottomed cylindrical shape and is a cover of a niobium rod.
  • reference numeral 80 indicates a phosphor film
  • reference numeral 82 indicates a protective film.
  • FIG. 16 (a) is an external view showing a schematic configuration of the fluorescent lamp 90
  • FIG. 16 (b) is a cross-sectional view of the fluorescent lamp 90.
  • FIG. 16 (b) is a cross-sectional view, but in order to avoid complications, knitting and pinching are omitted.
  • the fluorescent lamp 90 has a glass container 92 similar to the fluorescent lamp 10 (FIG. 1). On the outer periphery of the glass container 92, a first external electrode 94 having a “C” cross section extends in the longitudinal direction of the glass container 92. A second external electrode 96 having the same shape is formed on the outer periphery of the glass container 92 so as to face the first external electrode 94. A protective film 98 is formed on the inner peripheral surface portion of the glass container 92 facing the first outer electrode 94 and the second outer electrode 96, and the phosphor film 100 is formed on the remaining portion of the inner peripheral surface of the glass container 92. Is formed.
  • a phosphor film is formed on substantially the entire inner peripheral surface of the glass tube, which is the material of the glass container 92.
  • the phosphor film on the inner surface of the glass tube facing the first and second external electrodes 94, 96 is spread. (In this stage, the external electrodes 94 and 96 are not formed yet. However, in order to show the removal range of the phosphor film, the external electrodes are removed for convenience of explanation. )
  • a protective film 98 is formed in the same manner as in the above embodiment described with reference to FIG.
  • the phosphor film 98 also has a suspension 32 ( Fig. 6) is applied.
  • the suspension 32 penetrates into the phosphor film 98 as well. Therefore, strictly speaking, the film indicated by reference numeral 100 in FIG. 16B includes not only phosphor particles but also metal oxide particles.
  • cesium sulfate and sodium chloride cesium are exemplified as the cesium compounds dispersed in the protective film in order to improve the dark startability.
  • Cesium (Cs CO) may be used.
  • the compound dispersed in the protective film is not limited to the cesium compound, and may be a compound of another alkali metal [for example, lithium (Li), sodium (Na), potassium (K)].
  • alkali metal compounds compounds of alkaline earth metals [for example, magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba)] may be used.
  • 1S using borosilicate glass as a material for forming the glass container is not limited to this, and lead glass, lead-free glass, soda lime glass, or the like may be used.
  • the dark startability can be improved by forming the external electrode so as to cover the end face (outer end face) of the glass container. That is, the glass as described above contains a large amount of sodium oxide (Na 2 O), and the sodium (Na) component is the inner surface of the glass container over time.
  • the content of sodium oxalate in the glass material forming the glass container is preferably 5% or more and 20% or less. If it is less than 5%, the probability that the dark start time will exceed 1 second increases (in other words, if it is 5% or more, the probability that the dark start time will be within 1 second increases), and if it exceeds 20%, This is because problems such as whitening of the glass container resulting in a decrease in luminance due to long-term use, and a decrease in strength of the glass container occur.
  • the following may be considered as the external electrodes in this case. For example, a metal cap shape is extrapolated to the end portion of the glass container, or as shown in FIG.
  • the glass container end is placed in a solder tank in which molten solder is stored.
  • the portion is dated, and consists of a solder layer formed on the end portion.
  • it may be an external electrode as shown in FIG. 14 and described above.
  • a protective film is formed on the inner surface of the glass container, and a part of the external electrode is formed on the outer surface of the glass container opposite to the large area!
  • the discharge lamp according to the present invention can be suitably used, for example, as a light source of a backlight unit requiring high brightness.

Abstract

La présente invention concerne une lampe fluorescente à électrode externe. La présente invention concerne spécifiquement une lampe fluorescente à électrode externe (10) comprenant un récipient en verre (12), des électrodes externes (14, 16) disposées sur la surface extérieure du récipient en verre, une pellicule protectrice (18) disposée sur la surface intérieure du récipient en verre, et une pellicule de substance fluorescente (20). La pellicule protectrice est disposée au moins dans les zones correspondant aux électrodes externes, et est composée d’un agrégat de particules d'oxyde métallique (oxyde d’yttrium). La pellicule protectrice présente une épaisseur de pellicule moyenne inférieure ou égale à 2 µm, et une rugosité de surface inférieure ou égale à 1,7 µm. Une telle pellicule protectrice permet la prévention de la formation de trous d’épingle dans le récipient en verre.
PCT/JP2006/312769 2005-07-06 2006-06-27 Lampe à décharge, unité de rétroéclairage, et affichage à cristaux liquides WO2007004464A1 (fr)

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JP2007523945A JPWO2007004464A1 (ja) 2005-07-06 2006-06-27 放電ランプ、バックライトユニット、および液晶ディスプレイ装置

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JP2005-197248 2005-07-06
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008093768A1 (fr) * 2007-02-01 2008-08-07 Panasonic Corporation Lampe fluorescente, et dispositif électroluminescent et dispositif d'affichage utilisant cette même lampe
JP2009224185A (ja) * 2008-03-17 2009-10-01 Harison Toshiba Lighting Corp 放電ランプおよび放電ランプの製造方法

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JPH09167598A (ja) * 1995-12-18 1997-06-24 Matsushita Electron Corp 無電極形蛍光ランプ
JPH11167901A (ja) * 1997-12-05 1999-06-22 Nec Home Electron Ltd 希ガス放電灯及びその製造方法
JP2000113856A (ja) * 1998-10-02 2000-04-21 Matsushita Electric Works Ltd 蛍光ランプ及び放電灯点灯装置
JP2003171142A (ja) * 2001-12-03 2003-06-17 Toshiba Lighting & Technology Corp バリウムシリケートガラス、管球製品および照明装置
WO2003105184A2 (fr) * 2002-06-05 2003-12-18 Koninklijke Philips Electronics N.V. Lampe fluorescente et procede de fabrication
JP2004027332A (ja) * 2002-06-28 2004-01-29 Nippon Steel Corp スラブの加熱方法および加熱炉
JP2004127770A (ja) * 2002-10-03 2004-04-22 Harison Toshiba Lighting Corp 放電ランプおよび照明装置
JP2004146351A (ja) * 2002-06-17 2004-05-20 Harison Toshiba Lighting Corp 低圧放電ランプ及びその製造方法
JP2005026087A (ja) * 2003-07-02 2005-01-27 Matsushita Electric Ind Co Ltd 発光管及び無電極蛍光ランプ
JP2005174712A (ja) * 2003-12-10 2005-06-30 Toshiba Lighting & Technology Corp 無電極蛍光ランプ装置

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09167598A (ja) * 1995-12-18 1997-06-24 Matsushita Electron Corp 無電極形蛍光ランプ
JPH11167901A (ja) * 1997-12-05 1999-06-22 Nec Home Electron Ltd 希ガス放電灯及びその製造方法
JP2000113856A (ja) * 1998-10-02 2000-04-21 Matsushita Electric Works Ltd 蛍光ランプ及び放電灯点灯装置
JP2003171142A (ja) * 2001-12-03 2003-06-17 Toshiba Lighting & Technology Corp バリウムシリケートガラス、管球製品および照明装置
WO2003105184A2 (fr) * 2002-06-05 2003-12-18 Koninklijke Philips Electronics N.V. Lampe fluorescente et procede de fabrication
JP2004146351A (ja) * 2002-06-17 2004-05-20 Harison Toshiba Lighting Corp 低圧放電ランプ及びその製造方法
JP2004027332A (ja) * 2002-06-28 2004-01-29 Nippon Steel Corp スラブの加熱方法および加熱炉
JP2004127770A (ja) * 2002-10-03 2004-04-22 Harison Toshiba Lighting Corp 放電ランプおよび照明装置
JP2005026087A (ja) * 2003-07-02 2005-01-27 Matsushita Electric Ind Co Ltd 発光管及び無電極蛍光ランプ
JP2005174712A (ja) * 2003-12-10 2005-06-30 Toshiba Lighting & Technology Corp 無電極蛍光ランプ装置

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008093768A1 (fr) * 2007-02-01 2008-08-07 Panasonic Corporation Lampe fluorescente, et dispositif électroluminescent et dispositif d'affichage utilisant cette même lampe
JP2009224185A (ja) * 2008-03-17 2009-10-01 Harison Toshiba Lighting Corp 放電ランプおよび放電ランプの製造方法

Also Published As

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JPWO2007004464A1 (ja) 2009-01-22
KR20080025683A (ko) 2008-03-21
WO2007004464A8 (fr) 2008-01-03
TW200707502A (en) 2007-02-16

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