WO2008059725A1 - Dispositif de rétroéclairage, carte de circuit d'éclairage a source lumineuse et dispositif d'affichage a cristaux liquides - Google Patents

Dispositif de rétroéclairage, carte de circuit d'éclairage a source lumineuse et dispositif d'affichage a cristaux liquides Download PDF

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Publication number
WO2008059725A1
WO2008059725A1 PCT/JP2007/071489 JP2007071489W WO2008059725A1 WO 2008059725 A1 WO2008059725 A1 WO 2008059725A1 JP 2007071489 W JP2007071489 W JP 2007071489W WO 2008059725 A1 WO2008059725 A1 WO 2008059725A1
Authority
WO
WIPO (PCT)
Prior art keywords
light source
circuit board
fluorescent tube
backlight device
lighting circuit
Prior art date
Application number
PCT/JP2007/071489
Other languages
English (en)
Japanese (ja)
Inventor
Masaki Shimizu
Mitsuhiro Moriyasu
Original Assignee
Sharp Kabushiki Kaisha
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2007283164A external-priority patent/JP4172597B2/ja
Application filed by Sharp Kabushiki Kaisha filed Critical Sharp Kabushiki Kaisha
Priority to US12/514,512 priority Critical patent/US8107033B2/en
Publication of WO2008059725A1 publication Critical patent/WO2008059725A1/fr

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Classifications

    • 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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R33/00—Coupling devices specially adapted for supporting apparatus and having one part acting as a holder providing support and electrical connection via a counterpart which is structurally associated with the apparatus, e.g. lamp holders; Separate parts thereof
    • H01R33/02—Single-pole devices, e.g. holder for supporting one end of a tubular incandescent or neon lamp

Definitions

  • the present invention relates to a backlight device, a light source lighting circuit board, and a liquid crystal display device. More specifically, the backlight device used as a light source for illumination such as a liquid crystal television and the light source of the backlight device.
  • the present invention relates to a light source lighting circuit board for lighting and a liquid crystal display device equipped with the backlight device.
  • the fluorescent tube is lit at a current value that is the sum of the rated current and the leakage current in the vicinity of the high-voltage portion of the fluorescent tube, and this is in the tube axis direction of the fluorescent tube. This is the cause of the brightness difference. In this way, with the increase in the size of the backlight However, there was a tendency for temperature differences and luminance differences in the tube axis direction of the fluorescent tube to increase, and this caused uneven luminance of the backlight.
  • the fluorescent substance application step of the fluorescent tube involves a process of sucking up the suspension containing the fluorescent substance from any one of the end portions of the glass tube constituting the fluorescent tube.
  • the length of the glass tube becomes longer, it becomes difficult to obtain the uniformity of the distribution of the three color phosphors. If the distribution of the three color phosphors becomes non-uniform in the tube axis direction of the glass tube, Therefore, there is a difference in the ability of the phosphor to convert ultraviolet light into visible light and the proportion of the phosphor that absorbs visible light, resulting in uneven color and uneven brightness in the tube axis direction of the glass tube. It can be said that such a tendency becomes more prominent as the length of the fluorescent tube in the axial direction becomes longer.
  • Patent Document 1 discloses a technique for equalizing luminance unevenness and color unevenness of a backlight, which includes a linear light source and a part of the light source, And a diffuser that irradiates direct light from the light source and reflected light from the reflective member, the light source has two or more straight tube portions, and the length in the tube axis direction. And a lighting device for a transmissive image display device in which a plurality of light sources are alternately arranged to face each other.
  • Patent Document 2 when two U-shaped cathode tubes are arranged on the reflecting surface side of the reflecting case, the other cathode is placed between two straight tube portions of one cathode tube. Two cathode tubes are arranged with one straight tube part of the tube joined together.
  • Patent Document 1 JP-A-1 276503
  • Patent Document 2 JP 2002-100205 A
  • the size of the liquid crystal panel to be illuminated is limited.
  • the screen size of the liquid crystal panel is limited to a screen size having one side that is at most half the total length of the fluorescent tube.
  • the backlight chassis that houses the fluorescent tube is provided with a frame for masking the portion where the luminance unevenness occurs around the light emitting region of the fluorescent tube, and the effective light emitting region of the illumination light is changed to the light emitting region of the fluorescent tube. Narrower
  • the screen size of the liquid crystal panel is limited to a length shorter than half the total length of the bent tube type fluorescent tube.
  • the luminance unevenness of the region becomes more remarkable as the U-shaped or U-shaped bent portion is larger.
  • the operator takes out the fluorescent tubes stored in the packing material, for example, and then inside the knock light chassis.
  • the fluorescent tube it is necessary to work while changing the fluorescent tube so that the direction of each fluorescent tube is reversed.
  • the longer the length of the straight tube portion of the fluorescent tube the more cumbersome it is to carry out the replacement work, and it is easy to cause an installation error, thereby hindering production efficiency.
  • the fluorescent tube when the fluorescent tube is stored in the backlight chassis, it is usually mounted in the backlight chassis. It is necessary to connect the electrode part of the attached fluorescent tube to the inverter transformer of the inverter circuit board provided on the back of the backlight chassis. In this case, the wiring work for connecting the electrode portion of the fluorescent tube to the inverter transformer is also complicated, and the configuration of the fluorescent tube is designed to eliminate unevenness in brightness and color. However, it was necessary to ensure the safety of the high-voltage wiring process.
  • the present invention has been made in view of the above circumstances, and is a narrow problem that tends to be regarded as a problem when curved tube-type fluorescent tubes having U-shaped and U-shaped bent portions are alternately arranged.
  • a narrow problem that tends to be regarded as a problem when curved tube-type fluorescent tubes having U-shaped and U-shaped bent portions are alternately arranged.
  • the first technical means of the present invention includes a chassis that stores a plurality of light sources having electrodes arranged side by side, a light source lighting circuit board provided on the rear surface of the chassis, and an electrode. It has a storage part that can be attached to the chassis by storing the conductive holding part, and the storage part is attached to the chassis, so that the electrodes are electrically connected to the light source lighting circuit board provided on the back of the chassis. It is characterized by forming a closed state.
  • the second technical means is the first technical means, wherein a part of the storage portion passes through a through-hole provided in the chassis and forms a connection state with the connection portion provided in the light source lighting circuit board.
  • the light source is characterized by forming a state of being electrically connected to the light source lighting circuit board.
  • a third technical means is the first technical means in which the light source is electrically connected to the light source lighting circuit board by connecting a part of the storage part to the connection part mounted on the light source lighting circuit board. It is characterized by forming a connected state.
  • a fourth technical means is characterized in that, in the first technical means, a pair of light source lighting circuit boards is provided to connect to both ends of the light sources arranged side by side. .
  • the fifth technical means is characterized in that, in the first technical means, the light source lighting circuit board includes conduction means for connecting each of two electrodes of the light sources arranged side by side. It is a sign.
  • a sixth technical means is that, in the fifth technical means, the conduction means is provided on a surface opposite to the surface provided with the wiring pattern for supplying power from the light source lighting circuit board to the light source. That is a special feature.
  • a seventh technical means is the fifth technical means, wherein the conducting means is formed in a state of passing through the lower surface of the power supply means for supplying power to the light source.
  • An eighth technical means is the fifth technical means, wherein the conducting means electrically connects the electrodes of the adjacent fluorescent tubes.
  • At least one other light source is arranged between two light sources that form a state in which the electrodes are conducted by the conducting means. This is a special feature.
  • a tenth technical means is a light source lighting circuit board for lighting a plurality of light sources having electrodes, and the light source is electrically connected to the light source lighting circuit board by contacting a conductive holding part that holds the electrodes. It is characterized by having a connecting portion that forms a connected state.
  • An eleventh technical means is the same as the tenth technical means, wherein a plurality of connecting portions are provided, and each electrode of the light source electrically connected to the connecting portion is provided between two of the plurality of connecting portions. It is characterized by having a conduction means for connection.
  • the conduction means is provided on the surface opposite to the surface provided with the wiring pattern for supplying power to the light source, such as the light source lighting circuit board power. This is a special feature.
  • a thirteenth technical means is the eleventh technical means characterized in that the conduction means is formed in a state of passing through the lower surface of the power supply means for supplying power to the light source.
  • a fourteenth technical means is the eleventh technical means characterized in that the conduction means is provided between adjacent connecting portions.
  • a fifteenth technical means includes, in the eleventh technical means, another connection part for electrically connecting another light source between the connection parts connected by the conduction means. Was it It is characterized by.
  • the sixteenth technical means is characterized in that, in the fifth technical means, a U-shaped discharge path is formed by holding the electrodes of the two light sources connected to the conducting means.
  • the seventeenth technical means is the fifth technical means, wherein two light sources connected to the conducting means
  • the eighteenth technical means is characterized in that in any one of the first;!, 4, 10, 10; and 15 technical means, the conductive holding portion force electrode is detachably held. .
  • the nineteenth technical means is characterized in that, in any one of the first to eighteenth technical means, the light source is composed of an external electrode fluorescent tube.
  • the twentieth technical means includes the backlight device of technical means 1, and the liquid crystal panel illuminated by the backlight device; It is characterized by.
  • the present invention it is possible to make the luminance or chromaticity distribution in the entire screen uniform on a larger screen while ensuring the safety of high-voltage wiring processing with a smaller number of parts such as an inverter transformer.
  • FIG. 1 is a cross-sectional view showing a configuration example of a liquid crystal display device using a backlight device according to the present invention.
  • FIG. 2 is an external view showing a belt-type external electrode fluorescent tube which is an example of an external electrode fluorescent tube.
  • FIG. 3 is an external view showing a metal capsule type external electrode fluorescent tube as another example of an external electrode fluorescent tube (EEFL).
  • FIG. 4] is a diagram for conceptually explaining the main components of the backlight device according to the present invention and its assembled configuration.
  • FIG. 5 is a diagram for explaining a configuration example of a storage unit applied to the present invention.
  • FIG. 6 is a diagram for explaining a configuration example of a connection unit applied to the present invention.
  • FIG. 7] is a diagram for explaining a configuration example of an inverter circuit board applied to the present invention.
  • FIG. 8 is a diagram for explaining another configuration example of the inverter circuit board applied to the present invention.
  • FIG. 9 is a diagram for explaining still another configuration example of the inverter circuit board applied to the present invention.
  • FIG. 10 A diagram for explaining still another configuration example of the inverter circuit board applied to the present invention.
  • FIG. 11 is a diagram for explaining pre-processing of an inverter circuit board applied to the present invention.
  • FIG. 12 is a diagram for explaining an assembly process of a backlight device having a fluorescent tube connection configuration.
  • FIG. 13 is a diagram for explaining an assembly process of a backlight device having a fluorescent tube connection configuration.
  • FIG. 14 is a diagram for explaining an assembling process of a backlight device having a fluorescent tube connection configuration.
  • FIG. 15 is a diagram for explaining an assembly process of a backlight device having a fluorescent tube connection configuration.
  • FIG. 16 is a diagram showing a configuration example of a backlight device of the present invention.
  • FIG. 17 is a diagram showing another configuration example of the backlight device of the present invention.
  • FIG. 18 is a diagram showing still another configuration example of the backlight device of the present invention.
  • FIG. 19 is a diagram showing still another configuration example of the backlight device of the present invention.
  • FIG. 20 is a diagram showing still another configuration example of the backlight device of the present invention.
  • FIG. 21 is a diagram showing still another configuration example of the backlight device of the present invention.
  • Connection mounting hole 291 ⁇ Primary winding , 292 ... Secondary winding, 311 ... Holding part, 312 ... Foot part, 321 ... Metal guide part, 322 ... Chassis locking part, 323 ... Lamp insertion groove, 411 ... Inverter Connection piece, 412 ⁇ Connection piece for storage section.
  • FIG. 1 is a cross-sectional view showing a configuration example of a liquid crystal display device using a backlight device according to the present invention.
  • the liquid crystal display device includes a liquid crystal panel 1 and a backlight device 2 as main components.
  • the liquid crystal panel 1 feeds the video signal subjected to the video signal processing as a predetermined gradation voltage for each pixel in accordance with the clock signal of the liquid crystal panel 1, and performs video display processing by scanning sequentially on the screen. Displays video according to the.
  • the liquid crystal panel 1 is composed of two glass substrates with polarizing plates having a crossed Nicols relationship with a liquid crystal layer sandwiched therebetween, and is fixedly held by two frames 3 and 4.
  • the frames 3 and 4 have a structure in which the cross section is bent into a substantially L shape so as to cover the entire backlight device 2.
  • the knocklight device 2 includes a plurality of fluorescent tubes 21 for supplying light to the liquid crystal panel 1, and a reflective sheet or a light source for effectively irradiating the light emitted from each fluorescent tube 21 to the liquid crystal panel 1 side.
  • Reflector 22 hereinafter referred to as “reflector sheet”
  • Yashi 23 The shape of the reflection sheet 22 may be, for example, a flat surface shape as shown in FIG.
  • the knocklight chassis 23 corresponds to the chassis of the present invention.
  • An inverter circuit board 28 for mounting an inverter circuit is disposed on the rear surface of the knocklight chassis 23 (that is, the surface opposite to the installation surface of the fluorescent tube 21).
  • the inverter circuit board 28 is provided with components such as an inverter transformer 29 as a booster circuit for supplying power to each fluorescent tube 21.
  • an inverter transformer 29 As the inverter transformer 29, for example, there is a winding type that transforms based on the turns ratio of the coils by the electromagnetic induction effect of the two coils.
  • the inverter circuit board 28 corresponds to the light source lighting circuit board of the present invention, and the inverter transformer 29 corresponds to the power supply means of the present invention.
  • a separately excited inverter can be applied.
  • a separately-excited inverter is provided with an oscillation circuit on the primary side and converts it into alternating current having the same frequency as the drive frequency of the oscillation circuit.
  • the backlight device 2 is provided with a diffusion plate 24 for reducing the luminance difference between the position where the fluorescent tube 21 is disposed and the other positions.
  • the backlight device 2 can be provided with various optical members according to the optical performance required for the liquid crystal display device.
  • a diffusion sheet 25 for supplying optimal light distribution characteristics according to the usage form of a liquid crystal display device
  • a prism sheet 26 for condensing light in a specific direction, and polarization of light in a specific direction
  • a reflective polarizing plate 27 for improving the degree of polarization of light that is transmitted / reflected and incident on the liquid crystal panel 1 can be used.
  • These various optical members are configured in a plate shape or a sheet shape, and are arranged between fluorescent tube 21 and liquid crystal panel 1. .
  • the fluorescent tubes 21 have a straight tube shape, and a plurality of the fluorescent tubes 21 are arranged so that the straight portions thereof are parallel to each other.
  • the inverter circuit board 28 is disposed substantially parallel to the back surface thereof.
  • a high-voltage AC voltage is supplied to the electrode of the fluorescent tube 21 from the inverter transformer 29 mounted on the inverter circuit board 28.
  • mercury in the fluorescent tube 21 Is excited, and light near the ultraviolet light is emitted by the energy level.
  • the fluorescent tube 21 phosphors of three colors, red, blue, and green, emit light by the ultraviolet light. Then, due to the color mixture of these emission colors, the emission from the fluorescent tube 21 becomes white light.
  • the white light thus emitted has its light distribution characteristics controlled by the various optical members described above, and can effectively supply light to the liquid crystal panel 1.
  • the brightness of such light supplied from the backlight device 2 is controlled by each pixel of the liquid crystal panel 1, and an image is displayed on the screen.
  • a straight tube type external electrode fluorescent tube (EEFL (External Electrode Fluorescent Lamp)
  • EFL External Electrode Fluorescent Lamp
  • an electrode is provided outside the fluorescent tube, and plasma is induced in the fluorescent tube by an electric field of the external electrode to emit light.
  • FIG. 2 is an external view showing a belt-type external electrode fluorescent tube which is an example of the external electrode fluorescent tube.
  • the fluorescent tube 21 configured as a belt-type external electrode fluorescent tube electrodes 212 and 212 ′ are provided at both ends of the glass tube 211, and electrodes 213 and 213 ′ force S are provided at an intermediate portion thereof.
  • the electrodes 212 and 212 ′ at both ends are driven at a high frequency of several MHz or more. Further, it can be provided when the length of the glass tube 211 is long at a high frequency, particularly up to the intermediate electrodes 213 and 213.
  • FIG. 3 is an external view showing a metal capsule external electrode fluorescent tube as another example of the external electrode fluorescent tube (EEFL).
  • the fluorescent tube 21 configured as a metal capsule type external electrode fluorescent tube is provided with metal capsules 222 and 222 ′ at both ends of the glass tube 221.
  • Such a fluorescent tube 21 is used particularly when the glass tube 221 has a large diameter.
  • FIG. 4 is a diagram for conceptually explaining the main components of the backlight device according to the present invention and its assembled configuration.
  • a plurality of straight tube-type external electrode fluorescent tubes are arranged in parallel.
  • the backlight device 2 includes a fluorescent tube 21 serving as a light source, a backlight chassis 23 that stores a plurality of fluorescent tubes 21 side by side, and an inverter provided on the back of the backlight chassis 23. Circuit board 28.
  • the fluorescent tube 21 the external electrode fluorescent tube as described above is applied.
  • the backlight device 2 of the present embodiment includes a storage unit 30 attached to the backlight chassis 23.
  • the storage unit 30 stores a conductive holding unit (conductive wire holding unit) that holds the external electrode of the fluorescent tube 21.
  • the conductive holding part holds the electrode of the external electrode fluorescent tube in a detachable manner.
  • the external electrodes of the fluorescent tube 21 held by the conductive holding portion of the storage unit 30 correspond to the electrodes 212 and 212 ′ force S in the example of FIG. 2, and the metal capsules 22 2 and 222 ′ in the example of FIG.
  • the electrodes of the fluorescent tube 21 are electrically connected to the inverter circuit board 28 provided on the back surface of the backlight chassis 23.
  • a storage part through hole 231 for allowing the storage part 30 to pass therethrough is provided at a side end of the backlight chassis 23. Then, when a part of the storage part 30 passes through the storage part through hole 231, the conductive holding part stored in the storage part 30 and the connection part 40 provided in the inverter circuit board 28 are connected. Form. Thereby, the fluorescent tube 21 is electrically connected to the inverter transformer 281 mounted on the inverter circuit board 28.
  • the inverter transformer 281 corresponds to the inverter transformer 29 configured as shown in FIG.
  • Inverter circuit boards 28 are provided in pairs to provide a connection structure at both ends of the fluorescent tube 21 (FIG. 4 shows only one inverter circuit board 28!).
  • the inverter circuit board 28 includes conduction means for connecting the electrodes of the two fluorescent tubes 21 among the fluorescent tubes 21 arranged side by side.
  • the conduction means is realized by a conduction line 284 provided on the inverter circuit board 28. A specific configuration example of these inverter circuit boards 28 will be described later.
  • the lamp holder 50 covers the conductive holding part that holds the fluorescent tube 21 from the inner surface side of the backlight chassis 23.
  • the lamp holder 50 is provided with a groove 51, and the fluorescent tube 21 is arranged in the groove 51 when the lamp holder 50 is attached to the backlight chassis 23. With this configuration, the two fluorescent tubes 21 connected by the conduction means are guided.
  • the electrode is held by the linear holding portion to form a U-shaped discharge path.
  • FIG. 5 is a diagram for explaining a configuration example of a storage unit applied to the present invention.
  • the storage unit 30 is a component provided for positioning the fluorescent tube 21 with respect to the backlight chassis 23 while directly holding the electrodes of the fluorescent tube 21.
  • the storage unit 30 stores the conductive lamp holding bracket 31 for directly holding the electrodes of the fluorescent tube 21 and the lamp holding bracket 31 in a state of holding the fluorescent tube 21, and then the bottom surface of the knock light chassis 23. Or it has the electrode storage part 32 attached to a side surface.
  • the lamp holder 31 corresponds to the electrode holder of the present invention that holds the electrode of the fluorescent tube stored in the holder 30.
  • the electrode storage section 32 has a function of positioning the mounting position of the fluorescent tube 21 with respect to the backlight chassis 23! /.
  • the lamp holding bracket 31 has a holding portion 311 for holding the fluorescent tube 21 and a foot portion 312 for mounting on the inverter circuit board 28.
  • the electrode housing portion 32 includes a metal fitting guide portion (convex portion) 321, a nail-shaped chassis locking portion 322, and a notch-shaped lamp insertion groove 323.
  • the foot 312 of the lamp holder 31 By inserting the foot 312 of the lamp holder 31 into a fixed direction and position with respect to the bracket guide 321, the foot 312 is pulled out to the back side of the backlight chassis 23.
  • chassis locking portion 322 is locked to the backlight chassis 23 in a state where the metal fitting guide portion (convex portion) 321 passes through the storage portion through hole 231 of the backlight chassis 23.
  • the storage unit 30 is fixed to the backlight chassis 23.
  • a pair of chassis locking portions 322 are provided for one electrode storage portion 32.
  • the electrode of the fluorescent tube 21 is inserted into the lamp insertion groove 323.
  • the electrodes of the fluorescent tube 21 arranged in parallel inside the backlight chassis 23 and held by the holding portion 311 are inserted into the lamp insertion grooves 323 at predetermined positions in the electrode storage portion 32.
  • FIG. 6 is a diagram for explaining a configuration example of a connection unit applied to the present invention.
  • the connection portion 40 is composed of a connection fitting 41 and a connection fitting receiving portion 42.
  • connection fitting 41 forms a state of being electrically connected to the inverter circuit board 28 by being in contact with the lamp holding fitting 31 described above.
  • connection fitting receiving part 42 The fitting 41 is received so that the fixture 41 is mounted on the inverter circuit board 28 in a fixed position and orientation.
  • connection fitting 41 is formed by bending a part of the connection fitting 41 so as to contact the inverter connection piece 411 for connecting to the mounting pattern on the inverter circuit board 28 and the lamp holding fitting 31 of the storage section 30. It has a molded connecting part connecting piece 412! By bending the connection fitting 41, the contact state between the housing connection piece 412 and the lamp holding fitting 31 can be ensured by the action of a certain panel restoring force.
  • FIG. 7 is a diagram for explaining a configuration example of an inverter circuit board applied to the present invention.
  • the inverter circuit board 28 is connected to both ends of the fluorescent tubes 21 arranged side by side. Are provided as a pair.
  • the inverter circuit board 28 of this example is mounted with an inverter transformer (1-input 1-output type) 281, a high-pressure line 283, and a conduction line 284, and a storage portion mounting hole 285 and a connection portion mounting hole 287 And are provided.
  • the high voltage line 283 is a wiring pattern for supplying the high voltage AC voltage boosted by the inverter transformer 281 toward the fluorescent tube 21.
  • the conduction line 284 is a wiring pattern provided on the inverter circuit board 28 in order to electrically connect the two fluorescent tubes 21 to each other.
  • the conductive line 284 can be formed on the inverter circuit board 28 by pattern printing. This prevents the thickness from becoming excessively thick, and further eliminates the need for mounting other conductive means. It is possible to eliminate uneven brightness of the light.
  • an inverter transformer 281 is connected to each fluorescent tube 21 arranged in parallel, and a high-voltage AC voltage is supplied to the fluorescent tube 21 by each inverter transformer 281.
  • the electrodes on the side opposite to the supply side of the high-voltage AC voltage are connected by a conduction line 284. That is, the pair of fluorescent tubes 21 are connected by the conduction line 284 so that the same action as that of a U-shaped or U-shaped bent tube type fluorescent tube can be obtained.
  • the pair of fluorescent tubes 21 connected by the conductive line 284 will be described as a fluorescent tube unit.
  • a pair of adjacent fluorescent tubes 21 constitutes a fluorescent tube unit.
  • the inverter circuit board 28 is configured such that the high voltage side of the fluorescent tube unit (the connection side to the inverter transformer 281) and the connection side by the conductive line 284 are alternately arranged in the arrangement direction of the fluorescent tubes 21. Yes.
  • the storage portion mounting hole 285 is formed to penetrate a portion (metal guide portion 321) of the storage portion 30 attached to the backlight chassis 23 that protrudes to the back side of the knocklight shelves 23. .
  • the lamp holder 31 is electrically connected to the high-pressure line 283 or the conduction line 284 by passing a part of the storage part 30 through the storage part mounting hole 285.
  • the conductive line 284 connecting between the connecting portion mounting holes 287 corresponding to the positions of the two.
  • Connection portion attachment hole 287 is a through hole for attaching connection portion 40.
  • the connection part 40 is used to electrically connect the lamp holding metal 31 of the storage part 30 and the high-pressure line from the inverter transformer 29 as described above.
  • the connection portion 40 includes the connection fitting 41.
  • the connection bracket 41 is for connecting to the lamp holding bracket 31 of the storage portion 30 protruding from the back surface of the backlight chassis 23.
  • the connecting portion 40 is mounted on the inverter circuit board 28 using the connecting portion mounting hole 287 so that the storage portion 30 protruding from the back surface of the backlight chassis 23 is covered.
  • a plurality of connection portion mounting holes 287 are designed so as to be arranged in the arrangement direction of the fluorescent tubes 21.
  • the high-pressure area 286 is an area for warning the danger of a discharge phenomenon caused by the high-voltage line 283 and alerting the operator, and usually refers to a silk-printed area on which a precautionary note “high-pressure caution” is applied.
  • the aforementioned conducting line 284 is provided in this high pressure region, one fluorescent tube should not be connected to the conducting line! / As a result, there is a risk of leakage from the electrode of the other fluorescent tube. However, the operator can be alerted and the product safety can be ensured.
  • connection portion 40 and the storage portion 30 By the attachment mechanism of the fluorescent tube 21 by the connection portion 40 and the storage portion 30 as described above, high voltage power is supplied to the fluorescent tube 21 through a metal fitting that conducts high voltage AC voltage by a simple assembly process. It becomes possible.
  • FIG. 8 is a diagram for explaining another configuration example of the inverter circuit board applied to the present invention.
  • the inverter circuit board of this example is driven to light using one 1-input 1-output type inverter transformer 282 for one fluorescent tube unit composed of a pair of adjacent fluorescent tubes 21.
  • the electrodes on the opposite side to the high voltage side of the two fluorescent tubes 21 that are lit and driven by the inverter transformer 282 are connected to each other by a conduction line 284.
  • FIG. 8 other configurations are the same as those in the example of FIG. 7, and thus repeated description thereof is omitted.
  • FIG. 9 is a diagram for explaining still another configuration example of the inverter circuit board applied to the present invention.
  • Inverter circuit board 28 of this example uses one inverter transformer 281 of one input and one output type for each fluorescent tube 21 to drive lighting fluorescent tube 21.
  • the same electrode on the opposite side to the high voltage side of the two fluorescent tubes that are lit and driven by the inverter transformer 281 is connected by a conduction line 284 to constitute a fluorescent tube unit.
  • one fluorescent tube 21 of the other fluorescent tube unit is arranged between a pair of fluorescent tubes 21 constituting one fluorescent tube unit. Therefore, in one inverter circuit board 28, the storage portions 30 connected to the inverter transformer 281 and the storage portions 30 connected to the conducting lines 284 are alternately arranged in the arrangement direction of the fluorescent tubes 21. In this case, the conduction line 284 is formed in a state of passing through the lower surface of the inverter transformer 281 so as not to contact the high voltage line 283 connected to the adjacent fluorescent tube 21.
  • the other configurations are the same as those in the example of FIG.
  • FIG. 10 is a diagram for explaining still another configuration example of the inverter circuit board applied to the present invention.
  • the inverter circuit board 28 in this example is a single inverter with one input and two outputs.
  • the fluorescent tube unit including the pair of fluorescent tubes 21 is driven to light.
  • the electrodes on the opposite side to the high voltage side of the two fluorescent tubes 21 that are driven to turn on by the inverter transformer 282 are connected by a conduction line 284.
  • one fluorescent tube 21 of another fluorescent tube unit is arranged between a pair of fluorescent tubes 21 constituting one fluorescent tube unit.
  • the storage portions 30 connected to the inverter transformer 282 and the storage portions 30 connected to the conduction line 284 are alternately arranged in the arrangement direction of the fluorescent tubes 21.
  • the conductive line 284 is a wiring for supplying power to the fluorescent tube 21 from the back surface of the inverter transformer 282, that is, from the inverter circuit board 28 so as not to contact the high-voltage line 283 connected to the adjacent fluorescent tube 21. It is formed opposite to the surface provided with the pattern.
  • FIG. 10 Other configurations in FIG. 10 are the same as those in the example in FIG. 7, and thus repeated description thereof is omitted.
  • the electrodes on one side of the pair of fluorescent tubes 21 are connected to each other by a conduction line 284, and one primary winding is connected to the other electrode.
  • an inverter transformer 282 with two secondary windings and drive it!
  • two series are connected in series. It becomes possible to drive the connected fluorescent tubes in a differential (floating) manner.
  • a fluorescent tube unit that requires a higher discharge voltage than a single fluorescent tube of the same size, such as two fluorescent tubes connected in series, can supply a sufficient discharge voltage.
  • the “predetermined step-up ratio” in the description is generally designed to be almost equal to the turn ratio of the primary and secondary windings to the core material in the case of a wound transformer.
  • a high-voltage AC voltage is supplied to one of the fluorescent tubes 21, and the electrode of the other fluorescent tube 21 that is not connected to the conduction line 284 is used. It is also possible to adopt a configuration in which one side of the fluorescent tube unit is driven by grounding.
  • fluorescent tubes connected in series with other fluorescent tubes are arranged in parallel between the fluorescent tubes connected in series as shown in Fig. 9, and connected to each fluorescent tube unit.
  • the conductive lines 284 at both ends of the electrodes of the fluorescent tube, the luminance unevenness canceling performance of the backlight is further enhanced.
  • the electrode on the high-voltage side of the fluorescent tube tends to be brighter than the other electrode due to the influence of leakage current, etc.
  • FIG. 11 is a diagram for explaining pre-processing of the inverter circuit board applied to the present invention. Before the inverter circuit board 28 is attached to the backlight chassis 23, a process of previously mounting the connecting portion 40 for connecting the fluorescent tube 21 and the inverter transformer 281 (282) on the inverter circuit board 28 is performed.
  • connection portion connection pieces 411 protruding from the connection fitting receiving portion 42 of each connection portion 40 are sequentially inserted into the connection portion mounting holes 287 provided on the inverter circuit board 28, respectively. After that, soldering is performed together with other discrete electronic components (inverter transformer, capacitor, etc.), so that each of these connection portions 40 is securely mounted on the inverter circuit board 28.
  • FIG. 12 to FIG. 15 are diagrams for explaining the assembly process of the backlight device having the fluorescent tube connection structure as described above.
  • the storage unit 30 includes the lamp holding fixture 31 including the holding unit 311 that holds the fluorescent tube 21, and the electrode storage unit 32 that stores the electrode of the fluorescent tube 21 held by the lamp holding fixture 31. It is comprised by.
  • the prepared storage unit 30 is installed in the storage unit through-hole 231 of the backlight chassis 23.
  • the inner force of the backlight chassis 23 is also inserted into the storage portion through-hole 231 in the bracket guide portion 321 of the storage portion 30, and the tip end portion of the bracket guide portion 321 is projected to the back side of the backlight chassis 23.
  • the storage portion 30 is fixed to the backlight chassis 23 by the chassis locking portion 322 of the electrode storage portion 32 being locked to the backlight chassis 23 so as to restrict the thickness direction of the backlight.
  • FIG. 12 shows only one inverter circuit board 28.
  • the inverter circuit board 28 is mounted with the inverter transformer 281 as described above, and the high-voltage line 283 for supplying the fluorescent tube 21 with the high-voltage AC voltage boosted by the inverter transformer 281 and the electrodes of the pair of fluorescent tubes 21 are connected to each other.
  • a conduction line 284 for electrically connecting the two.
  • the connecting portion 40 is attached to the connecting portion mounting hole 287 of the inverter circuit board 28 and soldering is performed.
  • the storage portion connection piece 412 of the connection portion 40 and the high voltage line 283 or the conduction line 284 provided on the inverter circuit board 28 are electrically connected.
  • connection part 40 of the inverter circuit board 28 and the storage part 30 attached to the knocklight chassis 23 are connected, and the inverter circuit board 28 is fixed.
  • the bracket guide portion 321 of the storage section 30 engages with the storage section connection piece 412 of the connection section 40, and the lamp holding bracket 31 of the storage section 30 and the storage section connection piece 412 of the connection section 40 are electrically connected.
  • the storage unit connection piece 412 and the high voltage line 283, or the storage unit connection piece 412 and the conduction line 284 are electrically connected, the high voltage line 283 and the electrode of the fluorescent tube 21, and the conductive line 284 and the fluorescent tube The 21 electrodes are electrically connected.
  • the electrode housing 32 is locked in the backlight chassis 23 so as to restrict the action in the thickness direction of the backlight. Acts as a pressing force Therefore, it is possible to prevent the lamp from being broken during the assembly work.
  • the backlight chassis 23 is turned over, and the fluorescent tube 21 is disposed in the groove 51 of the lamp holder 50 from the inside of the backlight chassis 23 (the side opposite to the inverter circuit board 28). In this manner, the lamp holder 50 is attached.
  • the inside of the backlight chassis 23 to which the lamp holder 50 is attached is in a state as shown in FIG.
  • FIG. 16 is a diagram showing a configuration example of the backlight device of the present invention
  • FIG. 16 (A) schematically shows a state where the backlight chassis 23 with the inverter circuit board 28 attached is viewed from the back side.
  • FIG. 16B is a diagram for explaining the drive control of the fluorescent tube at this time.
  • the electrodes on one side of the pair of fluorescent tubes 21 are connected by the conduction line 284 to connect the fluorescent tube unit.
  • a straight tube type fluorescent tube is used and a configuration replacing the curved tube type fluorescent tube is realized.
  • an inverter transformer (one input, one output type) is connected to the electrode of one fluorescent tube 21 among the electrodes not connected to the conduction line 284. ) Connect 281 and ground the other fluorescent tube 21 electrode. As a result, the fluorescent tube unit connected by the conductive line 284 is driven on one side.
  • a pair of fluorescent tubes 21 constituting the fluorescent tube unit are arranged adjacent to each other, and a plurality of the fluorescent tube units arranged on the drive side (side to which the inverter transformer is connected) And the conductive line side (the side where the electrodes are connected by the conductive line 284), the force s , and the fluorescent tube 21 are arranged alternately.
  • the screen size of the liquid crystal panel is limited to a screen size having one side that is half the total length of the fluorescent tube at the maximum. Since a straight tube type fluorescent tube 21 can be used, a large screen can be supported. In addition, since a fluorescent tube unit with a conductive line is configured using a straight tube fluorescent tube, it is not necessary to increase the area of the frame that masks the bent portion, unlike a curved tube fluorescent tube. The screen area can be used effectively.
  • FIG. 17 is a diagram showing another configuration example of the backlight device of the present invention, and FIG. 17 (A) schematically shows a state where the backlight chassis 23 with the inverter circuit board 28 attached is viewed from the back side.
  • FIG. 17B is a diagram for explaining the drive control of the fluorescent tube at this time.
  • an inverter transformer (1-input 1-output type) 281 is connected to each of the electrodes not connected to the conduction line 284, and two fluorescent tube units are connected.
  • a high-voltage AC voltage whose phases are reversed from each other is supplied to the two electrodes.
  • the fluorescent tube units connected by the conduction line 284 are driven in an operating (floating) manner.
  • the pair of fluorescent tubes 21 constituting the fluorescent tube unit are arranged adjacent to each other, and the plurality of arranged fluorescent tube units are connected to the drive side (inverter transformer 281 is connected).
  • Side), the conduction line side (the side where the electrodes are connected by the conduction line 284), and the force fluorescent tube 21 are arranged so as to be arranged alternately.
  • FIG. 18 is a diagram showing still another configuration example of the backlight device of the present invention.
  • FIG. 18 (A) is a schematic view of the backlight chassis 23 with the inverter circuit board 28 attached as viewed from the back.
  • FIG. 18B is a diagram for explaining the drive control of the fluorescent tube at this time.
  • one inverter transformer (1-input 2-output type) 282 is connected to an electrode to which the conductive line 284 is not connected, and two fluorescent tube units are connected.
  • a high-voltage AC voltage whose phases are reversed from each other is supplied to the two electrodes.
  • the fluorescent tube units connected by the conduction line 284 are driven in an operating (floating) manner.
  • a pair of fluorescent tubes 21 constituting the fluorescent tube unit are arranged adjacent to each other, and a plurality of fluorescent tube units arranged on the drive side (the side to which the inverter transformer 282 is connected) are arranged. ) And the conductive line side (the side where the electrodes are connected by the conductive line 284) are arranged alternately in the arrangement direction of the fluorescent tubes 21! /.
  • FIG. 19 is a diagram showing still another configuration example of the backlight device of the present invention.
  • FIG. 19A is a schematic view of the backlight chassis 23 with the inverter circuit board 28 attached as viewed from the back side.
  • FIG. 19B is a diagram for explaining the drive control of the fluorescent tube at this time.
  • an inverter transformer (1-input 1-output type) 281 is connected to each of the electrodes not connected to the conduction line 284, and two fluorescent tube units are connected.
  • a high-voltage AC voltage whose phases are reversed from each other is supplied to the two electrodes. This activates the fluorescent tube unit connected by the conductive line 284 It is driven by the (rotating) method.
  • the pair of fluorescent tubes 21 constituting the fluorescent tube unit are arranged in a state where one of the fluorescent tubes 21 of the other fluorescent tube units is disposed therebetween.
  • a plurality of fluorescent tubes 21 are arranged on the drive side (the side to which the inverter transformer 281 is connected), the conductive line side (the side to which the electrodes are connected by the conductive line 284), and the force fluorescent tube 21 in the arrangement direction. It is configured to be arranged alternately.
  • the conduction line 284 is formed on the back surface of the inverter transformer 281 so as not to contact the high voltage line 283 connected to the adjacent fluorescent tube 21.
  • FIG. 20 is a diagram showing still another configuration example of the backlight device of the present invention
  • FIG. 20 (A) is a schematic view of the backlight chassis 23 with the inverter circuit board 28 attached as viewed from the back.
  • FIG. 20B is a diagram for explaining the drive control of the fluorescent tube at this time.
  • one inverter transformer (1-input 2-output type) 282 is connected to an electrode to which the conductive line 284 is not connected, and two fluorescent tube units are connected.
  • a high-voltage AC voltage whose phases are reversed from each other is supplied to the two electrodes.
  • the fluorescent tube units connected by the conduction line 284 are driven in an operating (floating) manner.
  • the pair of fluorescent tubes 21 constituting the fluorescent tube unit are arranged in a state where one of the fluorescent tubes 21 of the other fluorescent tube units is disposed therebetween.
  • a plurality of fluorescent tubes 21 are arranged on the drive side (the side to which the inverter transformer 282 is connected), the conduction line side (the side to which the electrodes are connected by the conduction line 284), and the force fluorescent tube 21 array. It is configured to be arranged alternately in the direction.
  • the conduction line 284 is formed on the back surface of the inverter transformer 281 so as not to contact the high voltage line 283 connected to the adjacent fluorescent tube 21.
  • the other fluorescent tube 21 is interposed between the two fluorescent tubes 21 of the fluorescent tube unit in which the electrodes are connected by the conductive line 284.
  • the force which has taken the arranged structure between the two fluorescent tubes 21 of the fluorescent tube unit, a configuration in which two or more other fluorescent tubes 21 are arranged may be taken.
  • the drive side and the conductive line side are arranged alternately on the left and right sides so that uneven brightness and uneven color can be eliminated.
  • FIG. 21 is a diagram showing still another example of the configuration of the backlight device of the present invention.
  • 21a to 2 Id are fluorescent tube units composed of two fluorescent tubes, and 29K291R and 291U are 1
  • the next winding, 292 (292R, 292U are secondary windings.
  • R and L in the respective symbols shown in the figure indicate the right side and the left side, respectively, and the symbols excluding R and L are the respective embodiments described above. Corresponds to the sign of.
  • FIG. 21 For each embodiment of the present invention described above, as shown in Fig. 21, another fluorescent tube is used for the fluorescent tube unit 21a having two fluorescent tubes connected in series as one unit.
  • the tube unit (21c) may be driven by a configuration in which it is connected in parallel to the inverter transformer 29. As a result, the number of parts can be reduced as much as possible within the range of power that can be output from the inverter transformer 29.
  • connection is mainly as follows.
  • the inverter circuit board 28R has two inverter transformers 29R.
  • the switch circuit 102R (for example, composed of two or four transistors such as FETs) is push-pull driven by the oscillation signal output from the oscillation circuit 103.
  • the direction of the current flowing through the primary winding of each inverter transformer 29R continuously changes according to the oscillation frequency.
  • the electric power input to the inverter transformer 29R is converted into an output voltage obtained by multiplying the step-up ratio N corresponding to the turns ratio of the primary winding and secondary winding that the inverter transformer 29R constitutes with the input voltage.
  • a high-voltage AC voltage that causes a discharge phenomenon in the fluorescent tube is applied.
  • a phase inversion circuit 101R is provided so that the AC voltages output from these two inverter transformers 29R maintain the opposite phase relationship with each other.
  • each of the secondary windings is configured so as to be wound in the opposite direction with respect to the primary winding wound around the bobbin of each inverter transformer 29R.
  • the present invention is not limited to this, and it may be configured such that the high-voltage terminal is connected to the fluorescent tube by reversing the GND terminal and the high-voltage terminal in each secondary winding of the inverter transformer having the same configuration.
  • the high-voltage AC voltages in antiphase relation output from the two inverter transformers 29R are supplied to the two fluorescent tube units 21a connected in series via the conduction line 284. It is supplied to the electrode 212R on the other end side, and has a configuration in which a fluorescent tube connected in a U shape is driven. At the same time, the two high-voltage AC voltages are configured to be input to the other two fluorescent tube units 21c in the same manner. As a result, the two fluorescent tube units 21a and 21c connected in series are connected to each other. The inverter transformer 29R is driven in parallel with each other.
  • the fluorescent tube units 21b and 21d configured by connecting two fluorescent tubes in series are also provided with two inverter transformers 29L, a switch circuit 102L, a phase inversion circuit 101L, etc. Driven in parallel with the same configuration as in 21a and 21c.
  • the fluorescent tube units 21a, 21c and 21b, 21d driven by the inverter circuit boards 28R, 28L, respectively, are arranged so as to be alternately arranged. Even if the number of transformer parts is large, the balance of the luminance distribution on the left and right of the screen with respect to the length direction of each fluorescent tube can be maintained, and the operator is not always aware of the orientation of the fluorescent tube unit. It becomes possible to assemble.
  • the configuration of the inverter transformer suggests the configuration as described above. Specifically, as shown in Fig. 21 (B), the primary windings 291R, 291L and the secondary winding respectively. Consists of windings 292R and 292L.
  • the inverter transformers 29 (29R, 29L) that connect the respective fluorescent tube units 21a to 21d in parallel should be configured with the smallest possible number and number.
  • the inverter transformer 29 is not rated enough (for example, output power) for the required power considering the power S and the number and length of fluorescent tubes connected in series, the two inverter transformers 29 are As shown in Fig. 21 (C), the primary windings 291 (291R, 291U and secondary windings 292 (292R, 292U are connected in parallel), Necessary power can be supplied by supplying power to 21a to 21d.
  • the inverter circuit board 28 is arranged on the outer surface of the housing 23 (that is, the surface opposite to the installation surface of the fluorescent tube 21). Forces showing the configuration example to be performed At least one of these inverter circuit boards 28L and R may be configured to be disposed on the inner surface of the housing 23. At that time, the inverter circuit board 28 arranged on the inner surface of the housing is assembled so that it can be housed together with each end of the fluorescent tube 21 by the lamp holder 50 as shown in FIG. While being realized, it is also possible to suppress the influence on the luminance unevenness that may occur in the vicinity where the inverter circuit board 28 is disposed. Further, in the above description, the same effect can be obtained in an example in which the inverter circuit board 28 is provided integrally with the lamp holder 50 for connecting the fluorescent tubes 21 in series.

Abstract

Un cadre est rendu plus étroit par une conception techniquement raisonnable, sans limitation technique pour rendre plus étroit un cadre qui a tendance à être considéré comme problématique quand des tubes fluorescents de type à tube courbé ayant des parties courbées en forme de U doivent être agencés de manière alternative de façon à être en face les uns des autres ou sans le problème du stockage de tubes fluorescents de type à tube courbé dans un châssis pendant la fabrication. Un dispositif de rétroéclairage (2) est fourni avec un châssis de rétroéclairage (23), une pluralité de tubes fluorescents (21), comprenant des électrodes, étant agencés et stockés et une carte de circuit d'inversion est agencée sur la surface arrière du châssis de rétroéclairage (23). En outre, le dispositif de rétroéclairage (2) est fourni avec une section de stockage (30), qui est reliée au châssis de rétroéclairage (23) en stockant une section de retenue conductrice destinée à retenir les électrodes. La section de stockage (30) étant reliée au châssis de rétroéclairage (23), les électrodes des tubes fluorescents (21) sont reliées de manière électrique à une carte de circuit d'éclairage de source lumineuse agencée sur la surface arrière du châssis de rétroéclairage (23).
PCT/JP2007/071489 2006-11-13 2007-11-05 Dispositif de rétroéclairage, carte de circuit d'éclairage a source lumineuse et dispositif d'affichage a cristaux liquides WO2008059725A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US12/514,512 US8107033B2 (en) 2006-11-13 2007-11-05 Backlight device and liquid crystal displaying device

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JP2006306295 2006-11-13
JP2006-306295 2006-11-13
JP2007283164A JP4172597B2 (ja) 2006-11-13 2007-10-31 バックライト装置、及び液晶表示装置
JP2007-283164 2007-10-31

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0618876A (ja) * 1991-08-23 1994-01-28 Sony Corp 液晶バックライトユニット
JP2000501229A (ja) * 1996-09-18 2000-02-02 フラット パネル ディスプレイ カンパニー（エフペーデー）ベスローテン フェンノートシャップ バックライト照明装置
JP2004294592A (ja) * 2003-03-26 2004-10-21 Tdk Corp バックライトユニット
JP2006286448A (ja) * 2005-04-01 2006-10-19 Matsushita Electric Ind Co Ltd 外部電極型蛍光ランプ、バックライトユニット及び外部電極型蛍光ランプの製造方法
JP2006344602A (ja) * 2005-06-09 2006-12-21 Samsung Electronics Co Ltd ランプ、ランプホルダー、電源供給モジュール、それを有するバックライトアセンブリ及び表示装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0618876A (ja) * 1991-08-23 1994-01-28 Sony Corp 液晶バックライトユニット
JP2000501229A (ja) * 1996-09-18 2000-02-02 フラット パネル ディスプレイ カンパニー（エフペーデー）ベスローテン フェンノートシャップ バックライト照明装置
JP2004294592A (ja) * 2003-03-26 2004-10-21 Tdk Corp バックライトユニット
JP2006286448A (ja) * 2005-04-01 2006-10-19 Matsushita Electric Ind Co Ltd 外部電極型蛍光ランプ、バックライトユニット及び外部電極型蛍光ランプの製造方法
JP2006344602A (ja) * 2005-06-09 2006-12-21 Samsung Electronics Co Ltd ランプ、ランプホルダー、電源供給モジュール、それを有するバックライトアセンブリ及び表示装置

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