WO2007132543A1 - 冷陰極管ランプ並びにそれを備えた表示装置用照明装置及び表示装置 - Google Patents
冷陰極管ランプ並びにそれを備えた表示装置用照明装置及び表示装置 Download PDFInfo
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- WO2007132543A1 WO2007132543A1 PCT/JP2006/323550 JP2006323550W WO2007132543A1 WO 2007132543 A1 WO2007132543 A1 WO 2007132543A1 JP 2006323550 W JP2006323550 W JP 2006323550W WO 2007132543 A1 WO2007132543 A1 WO 2007132543A1
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- Prior art keywords
- cathode tube
- counter electrode
- electrode
- cold cathode
- cold
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Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
- H05B41/14—Circuit arrangements
- H05B41/24—Circuit arrangements in which the lamp is fed by high frequency ac, or with separate oscillator frequency
- H05B41/245—Circuit arrangements in which the lamp is fed by high frequency ac, or with separate oscillator frequency for a plurality of lamps
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J5/00—Details relating to vessels or to leading-in conductors common to two or more basic types of discharge tubes or lamps
- H01J5/50—Means forming part of the tube or lamps for the purpose of providing electrical connection to it
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J5/00—Details relating to vessels or to leading-in conductors common to two or more basic types of discharge tubes or lamps
- H01J5/50—Means forming part of the tube or lamps for the purpose of providing electrical connection to it
- H01J5/52—Means forming part of the tube or lamps for the purpose of providing electrical connection to it directly applied to or forming part of the vessel
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J5/00—Details relating to vessels or to leading-in conductors common to two or more basic types of discharge tubes or lamps
- H01J5/50—Means forming part of the tube or lamps for the purpose of providing electrical connection to it
- H01J5/54—Means forming part of the tube or lamps for the purpose of providing electrical connection to it supported by a separate part, e.g. base
- H01J5/62—Connection of wires protruding from the vessel to connectors carried by the separate part
-
- 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
- H01J61/0672—Main electrodes for low-pressure discharge lamps characterised by the construction of the electrode
Definitions
- the present invention relates to a cold cathode tube lamp.
- FIG. 14 shows a schematic cross-sectional view of a conventional cold cathode tube lamp.
- the conventional cold cathode tube lamp shown in FIG. 14 has internal electrodes 2 and 3 in a glass tube 1. Part of the internal electrodes 2 and 3 penetrates the glass tube 1 and protrudes out of the glass tube 1 and functions as an electrode terminal.
- the glass tube 1 is hermetically sealed.
- the inner wall of the glass tube 1 is coated with a fluorescent material.
- the overall pressure in the glass pipe 1 is 10. 7 X 10 3 ⁇ 5. 3 X 10 3 Pa (80 ⁇ 40Torr) Ne On and argon are enclosed at a ratio of 95: 5, 80:20, etc., and several mg of mercury is enclosed. Xenon may be enclosed instead of mercury.
- Mercury and xenon generate ultraviolet rays by electricity, and the generated ultraviolet rays are applied to the inner wall of the glass tube 1 to emit fluorescent light.
- the equivalent circuit becomes a resistance whose resistance value decreases nonlinearly as the current increases, and nonlinear negativeity like the VI characteristic shown in FIG. It has impedance characteristics (see, for example, Patent Document 3).
- One application of the conventional cold cathode tube lamp shown in FIG. 14 is a backlight of a liquid crystal display device.
- a plurality of cold cathode tube lamps are used side by side.
- the same voltage is applied to all the cold-cathode tube lamps, so that one power supply device can be provided.
- the voltage across the first cold-cathode tube lamp decreases due to the nonlinear negative impedance characteristics. Since the both-end voltage of the second and third cold-cathode tube lamps also coincides with the both-end voltage of the first cold-cathode tube lamp, the AC voltage is the discharge start voltage V of the second cold-cathode tube lamp and the third
- the discharge start voltage V of the cold-cathode tube lamp of S2 is never reached. In other words, multiple cold cathode tubes
- each cold cathode tube lamp is connected to a power supply circuit via a harness (also referred to as a lead wire) and a connector, and it takes time and effort to install the cold cathode tube lamp. Assembling efficiency of lighting equipment etc. is poor, replacement effort when removing cold cathode tube lamps due to effort to remove cold cathode tube lamps, and disassembly efficiency when disposing lighting equipment etc. using cold cathode tube lamps was getting worse.
- FIG. 17 A schematic cross-sectional view of the external electrode fluorescent lamp is shown in FIG. In FIG. 17, the same parts as those in FIG. 14 are denoted by the same reference numerals, and detailed description thereof is omitted.
- the external electrode fluorescent lamp shown in FIG. 17 has a configuration in which the internal electrodes 2 and 3 are removed from the conventional cold cathode tube lamp shown in FIG. 14 and the external electrodes 4 and 5 are formed at the end of the glass tube 1. In the above configuration, the inside of the glass tube 1 is hermetically sealed.
- the generated ultraviolet light causes the fluorescent material applied to the inner wall of the glass tube 1 to emit light.
- the external electrode fluorescent lamp shown in FIG. 17 Since the inside of the glass tube 1 has nonlinear negative impedance characteristics, and the inside of the external electrode and the glass tube 1 is insulated by glass, the external electrode fluorescent lamp shown in FIG.
- the equivalent circuit is a series connection body in which a capacitor is connected to both ends of a resistor whose resistance value decreases nonlinearly as the current increases. For this reason, the entire external electrode fluorescent lamp shown in FIG. 17 has a nonlinear positive impedance characteristic such as the VI characteristic shown in FIG.
- the external electrode fluorescent lamp lights up. Thereafter, the AC voltage increases as the output of the power supply increases.
- the AC voltage reaches the discharge start voltage V ′ of the second external electrode fluorescent lamp, the second external electrode fluorescent lamp is turned on, and the AC voltage is
- the holder can be configured to sandwich the external electrode of the external electrode fluorescent lamp, and power can be supplied to the external electrode fluorescent lamp via the holder.
- Patent Document 1 JP 2004-31338 A
- Patent Document 2 JP 2004-39264 A
- Patent Document 3 Japanese Patent Laid-Open No. 7-220888 (Fig. 4)
- Patent Document 4 Japanese Patent Laid-Open No. 2004-39336
- Patent Document 5 Japanese Patent Laid-Open No. 5-121049
- Patent Document 6 Japanese Unexamined Patent Publication No. 64-82452
- Patent Document 7 Japanese Patent Laid-Open No. 2003-100482
- Patent Document 8 JP-A-11-40109
- Patent Document 9 Japanese Utility Model Publication No. 2-41362
- Patent Document 10 JP-A-6-84499
- the dielectric interposed between the external electrode and the internal space of the glass tube is sandwiched between the electrodes of the capacitor, which is a component of the equivalent circuit of the external electrode fluorescent lamp. Because it corresponds to the body, charged particles collide with the inner wall of the glass tube facing the external electrode, and the inner wall of the glass tube is sputtered locally. And when the inner wall of the glass tube is sputtered, the capacitance of the sputtered portion increases, so that charged particles concentrate and collide with the sputtered portion, and finally a pinhole is formed. A sealed state in the glass tube will not be maintained. Thus, the external electrode fluorescent lamp has a problem in reliability.
- the present invention provides a highly reliable cold cathode tube lamp capable of parallel lighting by parallel driving, and a display device illumination device and a display device including the cold cathode tube lamp. Objective.
- a cold cathode tube lamp according to the present invention is a cold cathode tube lamp which is powered by the external first conductive member and the second conductive member in the mounted state. It is composed of an insulating material.
- An insulating tube a first internal electrode provided inside the insulating tube, a second internal electrode provided inside the insulating tube, and an external electrode provided outside the insulating tube and having the same potential as the first internal electrode
- a first external electrode connected to the first internal electrode, a first insulator, and a first opposed to the first external electrode via the first insulator
- a counter electrode wherein the first counter electrode has a non-opposing portion not facing the first external electrode.
- the space between the non-opposing portion of the first counter electrode and the insulating tube is filled with a part of the first insulator, and the first conductive member and the first counter are mounted in a mounted state.
- the configuration is such that the electrode is electrically connected (hereinafter referred to as the first configuration).
- Light passing through Examples of the insulating tube made of the rim material include a glass tube and a resin tube.
- connection form between the internal electrode and the external electrode for example, a form in which a part of the internal electrode penetrates the insulating tube and protrudes out of the insulating tube and is connected to the external electrode, or a part of the external electrode is insulated
- Examples include a configuration in which the tube passes through the tube and protrudes into the insulating tube and is connected to the internal electrode, and a shape in which the conductor passes through the insulating tube and protrudes into and out of the insulating tube and is connected to the internal electrode and the external electrode.
- the insulating tube is hermetically sealed.
- the equivalent circuit of the cold-cathode tube lamp of the first configuration has a capacitor (hereinafter also referred to as a ballast capacitor) at least one end of a resistor whose resistance value decreases nonlinearly as the current increases. ) Is connected in series and has a non-linear positive impedance characteristic, so that the cold cathode tube lamps of the first configuration can be operated in parallel by parallel driving. Further, since the position of the first counter electrode is fixed with respect to the first external electrode, the capacitor formed by the first external electrode and the first counter electrode is stabilized. Can do.
- the first counter electrode has a non-opposing portion that is not opposed to the first external electrode, and the gap between the non-opposing portion of the first counter electrode and the insulating tube is the first electrode. 1 is filled with a part of the insulator, so that corona discharge does not occur in the vicinity of the non-opposing portion of the first counter electrode, and generation of corona discharge in the vicinity of the outer edge of the first counter electrode is suppressed. This increases the reliability of the cold cathode tube lamp.
- the first internal electrode provided outside the insulating tube and connected to the second internal electrode so as to have the same potential as the second internal electrode.
- a configuration in which the second conductive member and the second counter electrode are electrically connected in the mounted state hereinafter referred to as a second configuration
- a second configuration in which the second conductive member and the second counter electrode are electrically connected in the mounted state
- the equivalent circuit of the cold cathode tube lamp of the second configuration has a capacitor (hereinafter referred to as a “no last capacitor”) at both ends of a resistor whose resistance value decreases nonlinearly as the current increases. Is also connected in series, and has a nonlinear positive impedance characteristic. Therefore, parallel lighting by parallel driving of the cold cathode tube lamps of the second configuration becomes possible.
- the first counter electrode is fixed in position with respect to the first external electrode
- the second counter electrode is fixed in position with respect to the second external electrode.
- the capacitor formed by the first external electrode and the first counter electrode and the capacitor formed by the second external electrode and the second counter electrode can be stabilized.
- the first counter electrode has a non-opposing portion that is not opposed to the first external electrode, and the gap between the non-opposing portion of the first counter electrode and the insulating tube is the first electrode.
- the second counter electrode force is filled with a part of the insulator of 1 and has a non-opposing portion that does not oppose the second external electrode, and the non-opposing portion of the second counter electrode And the insulating tube are filled with a part of the second insulator, so that no corona discharge occurs near the non-opposing portion of the first and second counter electrodes.
- the generation of corona discharge near the outer edge of the counter electrode 2 can be suppressed, and the reliability of the cold cathode tube lamp is improved.
- the first external electrode is opposed to the first counter electrode, and has a non-opposing portion.
- the third configuration may be used.
- the outer edge of the first counter electrode corresponding to the boundary between the non-facing portion and the facing portion of the first external electrode does not exist. Corona discharge that can occur near the outer edge of the first counter electrode corresponding to the boundary between the non-facing portion and the facing portion can be reliably prevented. As a result, the generation of corona discharge near the outer edge of the first counter electrode can be further suppressed, and the reliability of the cold cathode tube lamp is further enhanced.
- the first external electrode does not have a non-facing portion that does not face the first counter electrode
- the second electrode The external electrode may have a non-opposing portion opposite to the second counter electrode, and may have a configuration! /, N! /, (Hereinafter referred to as a fourth configuration).
- the outer edge of the first counter electrode corresponding to the boundary between the non-facing portion and the facing portion of the first external electrode and the non-facing portion of the second external electrode are opposed to each other.
- the vicinity of the outer edge of the first counter electrode corresponding to the boundary between the non-facing portion and the facing portion of the first external electrode and the second Corona discharge that can occur in the vicinity of the outer edge of the second counter electrode corresponding to the boundary between the non-facing portion and the facing portion of the external electrode can be reliably prevented.
- the occurrence of corona discharge near the outer edges of the first and second counter electrodes can be further suppressed, and the reliability of the cold-cathode tube lamp is further enhanced.
- the first counter electrode has a convex portion, and the first conductive member and the first counter electrode are mounted in a mounted state.
- a configuration (hereinafter referred to as a fifth configuration) in which the convex portion comes into contact may be adopted.
- the first counter electrode has a convex portion, and the first conductive member and the first counter electrode are mounted in a mounted state.
- a configuration in which the second counter electrode has a convex portion, and the second conductive member and the convex portion of the second counter electrode are in contact with each other in the mounted state hereinafter referred to as the sixth It may also be referred to as a configuration.
- a lighting device for a display device includes a cold-cathode tube lamp having any one of the first to sixth configurations, the first conductive member, and the second And a power supply device that supplies power to the cold-cathode tube lamp through the first conductive member and the second conductive member (hereinafter referred to as a seventh configuration).
- a plurality of the cold cathode tube lamps are provided, and all or a part of the plurality of cold cathode tube lamps are electrically connected in parallel.
- a configuration hereinafter referred to as an eighth configuration may be used.
- the number of the power supply devices can be reduced, and downsizing, weight reduction, and cost reduction can be achieved.
- the phase of the voltage applied to the first internal electrode of the cold-cathode tube lamp electrically connected in parallel and the second internal electrode A configuration in which the phase of the voltage applied to each other is reversed by approximately 180 ° (hereinafter referred to as the ninth configuration) may be used.
- a display device includes a display device illumination device having any one of the seventh to ninth configurations.
- the equivalent circuit of a cold-cathode tube lamp is a series-connected body in which a capacitor is connected to at least one end of a resistor whose resistance value decreases nonlinearly as the current increases. Because of its characteristics, it can be operated in parallel by cold-cathode tube lamps in parallel drive. In addition, according to the present invention, since the generation of corona discharge near the outer edge of the counter electrode of the cold cathode tube lamp can be suppressed, the reliability is improved.
- FIG. 1 is a schematic sectional view of a cold cathode tube lamp according to the present invention.
- FIG. 2A is a diagram showing a state of attachment of the cold cathode tube lamp according to the present invention to a holder. It is.
- FIG. 2B is a diagram showing a state of attachment of the cold cathode tube lamp according to the present invention to the holder.
- [3A] is a diagram showing a modification of the cold cathode tube lamp according to the present invention.
- [3B] is a diagram showing a modification of the cold cathode tube lamp according to the present invention.
- [4A] is a view showing a modification of the cold cathode tube lamp according to the present invention.
- ⁇ 4B] is a view showing a modification of the cold cathode tube lamp according to the present invention.
- [4C] is a view showing a modification of the cold cathode tube lamp according to the present invention.
- FIG. 5 is a diagram showing an arrangement example of the power supply device in the illumination device for display device according to the present invention.
- FIG. 6 is a diagram showing an arrangement example of the power supply device in the illumination device for display device according to the present invention.
- FIG. 7] is a diagram showing an arrangement example of the cold cathode tube lamp and the holder in the display device illumination device according to the present invention.
- FIG. 8 is a diagram showing an arrangement example of cold cathode tube lamps and holders in the display device illumination device according to the present invention.
- FIG. 9 is a diagram showing an arrangement example of the cold cathode tube lamp and the holder shown in FIG. 7 and an arrangement example of the power supply device in the arrangement example of the cold cathode tube lamp and the holder shown in FIG.
- FIG. 10 is a diagram showing an arrangement example of the cold cathode tube lamp and the holder shown in FIG. 7 and an arrangement example of the power supply device in the arrangement example of the cold cathode tube lamp and the holder shown in FIG.
- FIG. 11 is a diagram showing an arrangement example of the cold cathode tube lamp and the holder shown in FIG. 7 and an arrangement example of the power supply device in the arrangement example of the cold cathode tube lamp and the holder shown in FIG.
- FIG. 12A is a view showing a modification of the cold cathode tube lamp according to the present invention.
- FIG. 12B is a diagram showing a modification of the cold cathode tube lamp according to the present invention.
- FIG. 12C is a view showing a modification of the cold cathode tube lamp according to the present invention.
- [12D] is a diagram showing a modification of the cold cathode tube lamp according to the present invention.
- FIG. 12E is a view showing a modification of the cold cathode tube lamp according to the present invention.
- FIG. 12F is a view showing a modification of the cold cathode tube lamp according to the present invention.
- FIG. 13A is a view showing a modification of the cold cathode tube lamp according to the present invention.
- FIG. 13B is a diagram showing a modification of the cold cathode tube lamp according to the present invention.
- FIG. 14 is a schematic cross-sectional view of a conventional cold cathode tube lamp.
- FIG. 15 is a diagram showing the VI characteristics of the conventional cold cathode tube lamp shown in FIG.
- FIG. 16 is a diagram showing the VI characteristics of a plurality of conventional cold cathode tube lamps.
- FIG. 17 is a schematic cross-sectional view of an external electrode fluorescent lamp.
- FIG. 18 is a diagram showing the VI characteristics of the external electrode fluorescent lamp shown in FIG.
- FIG. 19 is a diagram showing VI characteristics of a plurality of external electrode fluorescent lamps.
- FIG. 20 is a view showing a schematic cross-sectional view of a cold cathode tube lamp having a counter electrode shape different from that of the cold cathode tube lamp according to the present invention.
- FIG. 1 is a schematic sectional view of a cold cathode tube lamp according to the present invention.
- the cold cathode tube lamp shown in FIG. 1 is provided with external electrodes 4 and 5 at one end of the glass tube 1 of the conventional cold cathode tube lamp shown in FIG. 14, and the protruding portion of the internal electrode 2 and the external electrode 4 are connected by solder 6. Soldering is performed, and the protruding portion of the internal electrode 3 and the external electrode 5 are soldered with the solder 7 to form the insulating layers 8 and 9 on the external electrodes 4 and 5, respectively.
- Cylindrical cap-shaped counter electrodes 10 and 11 are formed on each of them, and the counter electrode 10 has a non-opposing portion that does not face the external electrode 4, and the counter electrode 11 faces the external electrode 5.
- Between the non-opposing portion of the counter electrode 10 and the glass tube 1 is filled with a part of the insulating layer 8, and the non-opposing portion of the counter electrode 11 and the glass tube 1 are filled with each other.
- the gap is filled with a part of the insulating layer 9, and there is a non-opposing part that does not face the external electrode 4 force counter electrode 10
- the external electrode 5 does not have a non-opposing portion that does not face the counter electrode 11.
- the external electrodes 4 and 5 include metal paste, metal stay, metal cap, and the like.
- the material for the insulating layers 8 and 9 include inorganic ceramics and resin. If the electrical connection between the protruding portion of the internal electrode 2 and the external electrode 4 and the electrical connection between the protruding portion of the internal electrode 3 and the external electrode 5 are sufficient, the solder 6 and 7 can be omitted. Ok.
- An illumination device for a display device includes a cold cathode tube lamp shown in FIG. 1, an illumination unit, and an optical sheet, and the cold cathode tube lamp shown in FIG. 1 is provided in front of the illumination unit.
- the optical sheet covers the front of the lighting unit attached to the holder and attached with the cold cathode tube lamp shown in FIG.
- FIG. 2A and FIG. 2B show how the cold cathode tube lamp shown in FIG. 1 is attached to the holder.
- 2A is a front view
- FIG. 2B is a side view.
- Plural pairs of holders 14 are provided on the front surface of the lighting unit, and one power supply device (not shown) is provided on the back surface of the lighting unit.
- the power supply unit is an AC power supply of several tens of kHz. Output pressure.
- the holders 14 provided on the front left peripheral edge 15 of the lighting unit are connected in common and connected to one end of the power supply device. Further, the holders 14 provided on the front right peripheral edge portion 16 of the illumination unit are connected in common and connected to the other end of the power supply device.
- Each holder 14 is made of an elastic metal member (for example, panel steel), sandwiches the counter electrode of the cold cathode tube lamp shown in FIG. 1 by the elastic characteristics of the elastic metal member, and has the configuration shown in FIG.
- the 17 counter electrodes 10 and 11 and the holder 14 are electrically connected. With such a configuration, it is possible to connect the cold cathode tube lamp shown in FIG. 1 and the power supply device without using a harness (also referred to as a lead wire) and a connector.
- a harness also referred to as a lead wire
- a cold cathode tube lamp 17 having the configuration shown in FIG. 1 (hereinafter referred to as “cold cathode tube lamp 17”) includes a capacitor and a cold cathode tube lamp 17 formed by the external electrode 4 and the counter electrode 10 of the cold cathode tube lamp 17. Since the capacitor is formed by the external electrode 5 and the counter electrode 11, the equivalent circuit becomes a series connection body in which the capacitor is connected to both ends of the resistor whose resistance value decreases nonlinearly as the current increases. As with the external electrode fluorescent lamp shown in FIG. 17, it has a nonlinear positive impedance characteristic. Therefore, even if a plurality of cold-cathode tube lamps 17 are driven in parallel, all the cold-cathode tube lamps 17 are lit.
- a harness also referred to as a lead wire
- a conductor housing of the lighting unit are connected between the resistor and the capacitor of the equivalent circuit.
- the internal electrode is sputtered by the collision of charged particles, but since the internal electrode is at the same potential, the charged particles reach a location close to the discharge area of the internal electrode like a lightning rod and perform sputtering. Do. As the sputtering progresses, the location close to the discharge region of the internal electrode changes, so that the concentration of the spotting unlike the external electrode fluorescent lamp shown in FIG. 17 does not occur. Therefore, the lamp life is determined by the physical size of the internal electrode.
- the cold cathode tube lamp 17 includes an external electrode 4 and a counter electrode 10 of the cold cathode tube lamp 17.
- Capacitor and cold cathode tube lamp 17 are formed by the external electrode 5 and the counter electrode 11, and the positions of the counter electrodes 10 and 11 are fixed with respect to the external electrodes 4 and 5, respectively.
- the capacitor formed by the external electrode 4 and the counter electrode 10 of the lamp 17 and the capacitor formed by the external electrode 5 and the counter electrode 11 of the cold cathode tube lamp 17 can be stabilized.
- FIG. 20 shows a schematic sectional view of a cold cathode tube lamp in which the shape of the counter electrodes 10 and 11 is different from that of the cold cathode tube lamp 17.
- the same parts as those in FIG. 1 are denoted by the same reference numerals and detailed description thereof is omitted.
- the electric field lines due to the electric charges of the external electrode 4 and the counter electrode 10 are not only the electric field lines that linearly connect the external electrode 4 and the counter electrode 10. There are also electric lines of force that wrap around the 10 outer edges. For this reason, the air layer near the outer edge of the counter electrode 10 may cause a dielectric breakdown depending on the voltage application condition, and corona discharge may occur near the outer edge of the counter electrode 10. If corona discharge occurs in the vicinity of the outer edge of the counter electrode 10, the counter electrode 10 and the insulating layer 8 may be damaged by heat or ozone may be generated, resulting in poor reliability of the cold cathode lamp. Become. Similarly, in the cold cathode tube lamp shown in FIG. 20, corona discharge may occur near the outer edge of the counter electrode 11.
- the counter electrode 10 has a non-opposing portion that does not face the external electrode 4, and the counter electrode 11 faces the external electrode 5.
- the non-opposing portion of the counter electrode 10 and the glass tube 1 are filled with a part of the insulating layer 8, and the non-opposing portion of the counter electrode 11 and the glass tube 1 are Is filled with a part of the insulating layer 9, the external electrode 4 force does not have a non-opposing part that does not face the counter electrode 10, and the external electrode 5 does not face the counter electrode 11
- the shape of the counter electrodes 10 and 11 of the cold cathode tube lamp 17 may be changed to provide the cold cathode tube lamp shown in FIG. 3A.
- FIG. 3A the same parts as those in FIG. Description is omitted.
- the cold cathode tube lamp shown in FIG. 3A the counter electrodes 10 and 11 completely cover the insulating layers 8 and 9, respectively.
- the cold cathode tube lamp shown in FIG. 3B may be changed by changing the shape of the counter electrodes 10 and 11 of the cold cathode tube lamp 17.
- FIG. 3B the same parts as those in FIG. In the cold-cathode tube lamp shown in FIG.
- the counter electrode corresponding to the boundary between the non-facing portion of the external electrode 4 (the portion not facing the counter electrode 10) and the facing portion (the portion facing the counter electrode 10)
- the outer edge of 10 and the non-opposing portion of the external electrode 5 (the portion facing the opposing electrode 11) and the boundary between the opposing portion (the portion facing the opposing electrode 11) of the opposing electrode 11 Since there is an outer edge, the outer edge of the counter electrode 11 near the outer edge of the counter electrode 10 corresponding to the boundary between the non-facing portion and the facing portion of the external electrode 4 and the boundary between the non-facing portion and the facing portion of the outer electrode 5
- the electric lines of force may wrap around the area, causing corona discharge.
- the cold cathode tube lamp shown in FIG. 3B is less reliable than the cold cathode tube lamp shown in FIG.
- the cold-cathode tube lamp shown in FIG. 3B is much more reliable than the cold-cathode tube lamp shown in FIG. 20 because corona discharge does not occur near the non-opposing portions of the counter electrodes 10 and 11.
- the counter electrodes 10 and 11 of the cold cathode tube lamp 17 and the holder 14 are electrically connected! 4A, 4B, and 4C are provided with annular projections 10A and 11A, respectively, to ensure electrical connection with 14 and mounted in a mounted state!
- the convex portions 10A and 11A are in contact with the holder 14 respectively.
- the holders provided on the front left peripheral edge portion 15 of the lighting unit are connected in common and connected to one end of the power supply device 18.
- the holders provided on the front right peripheral edge 16 of the lighting unit are connected in common and connected to the other end of the power supply unit 18.
- the power supply device 18 is a power supply device that is provided on the back surface of the lighting unit and outputs an alternating voltage of several tens of kHz.
- the holders provided on the front left peripheral edge portion 15 of the lighting unit are connected in common and connected to one end of the power supply device 19.
- the holders provided on the front right peripheral edge 16 of the lighting unit are connected in common and connected to one end of the power supply device 20.
- the power supply 19 The other end and the other end of the power supply device 20 are connected to the ground.
- Each of the power supply devices 19 and 20 is a power supply device that is provided on the back surface of the lighting unit and outputs an AC voltage of several tens of kHz.
- the arrangement example of the power supply device shown in FIG. 6 can reduce the routing of the high-voltage lines 21 and 22 that transmit a high voltage, so that the lamp current can be stabilized and the power loss can be reduced. .
- the illumination device for a display device it is desirable from the viewpoint of reducing the number of power supply devices that one power supply device drives all cold-cathode tube lamps in parallel. Due to the balance with the number of cold cathode tube lamps, etc., a single power supply unit does not drive all the cold cathode tube lamps in parallel. You may make it provide the power supply device which drives a lamp in parallel for every group.
- the phase of the voltage applied to one internal electrode side of the cold cathode tube lamps electrically connected in parallel and the phase of the voltage applied to the other internal electrode side are approximately 180 °. You may make it the structure inverted. According to such a configuration, the luminance gradient due to the leakage current flowing to the conductor (for example, the metal casing of the display device lighting device) close to the power supply line connected in parallel becomes symmetrical, so that the illumination quality is improved. Can be improved. In addition, according to such a configuration, when the display device illumination device is mounted on a display device, a voltage that affects a display element (for example, a display element of a liquid crystal display panel) adjacent to a parallel-connected power supply line is net. Therefore, noise in the display element caused by the display device illumination device can be canceled.
- a display element for example, a display element of a liquid crystal display panel
- the illumination device for a display device according to the present invention is applied to a display device having a display screen size exceeding 37V type, in order to keep the discharge start voltage of the cold cathode tube lamp low, for example, the display according to the present invention It is desirable that the arrangement of the cold cathode tube lamp and the holder in the apparatus illumination device is as shown in FIG. 7 or FIG.
- each front left cold-cathode tube lamp 23 is sandwiched between the respective holders provided at the front left peripheral edge portion 15, The front right end of each front left cold-cathode tube lamp 23 is sandwiched by each holder provided in the first central portion 25, and the front right end of each front right cold-cathode tube lamp 24 is the front right edge. The front left end of each front right cold-cathode tube lamp 24 is sandwiched between the respective holders provided in the second central portion 26.
- each front left cold-cathode tube lamp 23 is sandwiched between the respective holders provided at the front left peripheral edge portion 15, The front right end of each front left cold-cathode tube lamp 23 is sandwiched between the respective holders provided in the first central portion 25, and the front right end of each front right cold-cathode tube lamp 24 is the front right peripheral portion 16 The front left end of each front right cold-cathode tube lamp 24 is sandwiched between the respective holders provided in the second central portion 26 and is placed on the first central portion 25.
- the light emitting area of the front right cold cathode tube lamp 24 exists, and the light emitting area of the front left cold cathode tube lamp 23 exists on the second central portion 26.
- the arrangement example of the cold cathode tube lamp and the holder shown in FIG. 8 is light emission in the region of the first central portion 25 and the second central portion 26 as compared with the arrangement example of the cold cathode tube lamp and the holder shown in FIG. A decrease in the amount can be suppressed.
- the holders provided on the front left peripheral edge portion 15 of the illumination unit are connected in common and connected to one end of the power supply device 27 and the ground.
- the holders provided on the front right peripheral edge 16 of the lighting unit are connected in common and connected to one end of the power supply device 28 and the ground.
- the holders provided in the first central part 25 of the lighting unit and the holders provided in the second central part 26 of the lighting unit are connected in common to the other end of the power supply 27 and the other end of the power supply 28.
- Each of the power supply devices 27 and 28 is a power supply device that is provided on the back surface of the lighting unit and outputs an AC voltage of several tens of kHz.
- the other end force of the power supply device 27 and the other end force of the power supply device 28 are also in phase with each other.
- the holders provided on the front left peripheral edge portion 15 of the lighting unit are connected in common and connected to one end of the power supply device 29.
- the holders provided on the front right peripheral edge 16 of the lighting unit are connected in common and connected to one end of the power supply device 30.
- the holders provided in the first central part 25 of the lighting unit and the holders provided in the second central part 26 of the lighting unit are connected in common to the other end of the power supply device 29, the other end of the power supply device 30, And connected to ground.
- Each of the power supply devices 29 and 30 is a power supply device that is provided on the rear surface of the lighting unit and outputs an AC voltage of several tens of kHz. From one end of the power supply device 29 and one end of the power supply device 30, the same phase or opposite phase is provided. Is output.
- the holders provided on the front left peripheral edge portion 15 of the illumination unit are connected in common and connected to one end of the power supply device 31 and the ground.
- the holders provided on the front right peripheral edge portion 16 of the illumination unit are connected in common and connected to one end of the power supply device 31 and the ground.
- the holders provided in the first central part 25 of the lighting unit and the holders provided in the second central part 26 of the lighting unit are connected in common and connected to the other end of the power supply 31.
- the power supply device 31 is a power supply device that is provided on the back surface of the lighting unit and outputs an AC voltage of several tens of kHz.
- the routing of the high-voltage line transmitting a high voltage can be reduced, so that the lamp current can be stabilized and the power loss can be reduced. It can be done.
- the cold cathode tube lamp according to the present invention as shown in Figs. 12A to 12F, one of the tube axes of the external electrode portion (the portion where the external electrode of the glass tube is formed! Is shown.
- the part or the whole may be substantially perpendicular to the tube axis in the main arrangement direction of the light emitting part. Accordingly, in order to increase the electrostatic capacity of the capacitor formed by the external electrode and the counter electrode of the cold cathode tube lamp according to the present invention, the counter electrode and the external electrode of the cold cathode tube lamp according to the present invention are used. Even if the area is increased, an increase in the width of the frame portion of the lighting device for display device can be suppressed.
- the cold cathode tube lamp according to the present invention is provided with two external electrodes. Since the non-linear positive impedance characteristic can be obtained even if only one external electrode is provided, the cold cathode tube lamp according to the present invention may have a configuration including only one external electrode.
- the cold-cathode tube lamp according to the present invention shown in FIG. 1 is modified into a configuration having only one external electrode, it is as shown in FIG. 13A.
- the lamp end on the internal electrode 3 side is connected to the power supply circuit via a harness (also referred to as a lead wire) and a connector. It takes time to install and remove the tube lamp.
- the cold cathode tube lamp according to the present invention is provided with two insulating layers.
- the nonlinear positive impedance characteristic can be obtained even if only one insulating layer is provided.
- Such a cold cathode tube lamp may be configured to have only one insulating layer.
- FIG. 13B when the cold-cathode tube lamp according to the present invention shown in FIG. 1 is modified into a configuration having only one insulating layer, it is as shown in FIG. 13B.
- the lamp end on the internal electrode 3 side adopts a configuration in which the holder clamps the external electrode by the elastic characteristics of the holder made of an elastic metal member (for example, panel steel). Therefore, it is easy to mount and remove the cold cathode tube lamp.
- a display device includes the above-described illumination device for a display device according to the present invention and a display panel.
- Specific examples of the display device according to the present invention include a transmissive liquid crystal display device in which the display device illumination device according to the present invention is used as a backlight unit and a liquid crystal display panel is provided in front of the backlight unit.
- the cold-cathode tube lamp of the present invention can be used as an illumination source provided in various devices including an illumination source provided in a display device illumination device.
Landscapes
- Liquid Crystal (AREA)
- Planar Illumination Modules (AREA)
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2006800545702A CN101438376B (zh) | 2006-05-12 | 2006-11-27 | 冷阴极管灯以及具备它的显示装置用照明装置和显示装置 |
US12/295,311 US8030859B2 (en) | 2006-05-12 | 2006-11-27 | Cold-cathode lamp, and display illumination device and display device therewith |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006-133636 | 2006-05-12 | ||
JP2006133636 | 2006-05-12 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2007132543A1 true WO2007132543A1 (ja) | 2007-11-22 |
Family
ID=38693645
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2006/323550 WO2007132543A1 (ja) | 2006-05-12 | 2006-11-27 | 冷陰極管ランプ並びにそれを備えた表示装置用照明装置及び表示装置 |
Country Status (3)
Country | Link |
---|---|
US (1) | US8030859B2 (ja) |
CN (1) | CN101438376B (ja) |
WO (1) | WO2007132543A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8084957B2 (en) | 2006-07-03 | 2011-12-27 | Sharp Kabushiki Kaisha | Illuminating apparatus for display device and display device having same |
JP5472112B2 (ja) * | 2008-09-22 | 2014-04-16 | 株式会社Gsユアサ | エキシマランプ及びエキシマランプユニット及び紫外線照射装置 |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
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US8080941B2 (en) * | 2006-05-12 | 2011-12-20 | Sharp Kabushiki Kaisha | Cold cathode lamp, and illumination device for display device and display device provided therewith |
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JP5472112B2 (ja) * | 2008-09-22 | 2014-04-16 | 株式会社Gsユアサ | エキシマランプ及びエキシマランプユニット及び紫外線照射装置 |
Also Published As
Publication number | Publication date |
---|---|
CN101438376B (zh) | 2010-07-07 |
CN101438376A (zh) | 2009-05-20 |
US20100225253A1 (en) | 2010-09-09 |
US8030859B2 (en) | 2011-10-04 |
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