WO2009144986A1 - Illuminating device and display device - Google Patents

Illuminating device and display device Download PDF

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Publication number
WO2009144986A1
WO2009144986A1 PCT/JP2009/054265 JP2009054265W WO2009144986A1 WO 2009144986 A1 WO2009144986 A1 WO 2009144986A1 JP 2009054265 W JP2009054265 W JP 2009054265W WO 2009144986 A1 WO2009144986 A1 WO 2009144986A1
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WO
WIPO (PCT)
Prior art keywords
cold cathode
cathode fluorescent
liquid crystal
inverter circuit
fluorescent tube
Prior art date
Application number
PCT/JP2009/054265
Other languages
French (fr)
Japanese (ja)
Inventor
稲葉友章
Original Assignee
シャープ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by シャープ株式会社 filed Critical シャープ株式会社
Publication of WO2009144986A1 publication Critical patent/WO2009144986A1/en

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Classifications

    • 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
    • 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
    • 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
    • G02F1/133608—Direct backlight including particular frames or supporting means
    • 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
    • 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
    • H05B41/02—Details
    • 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
    • G02F1/133612—Electrical details

Definitions

  • the present invention relates to a lighting device, particularly a lighting device using a discharge tube such as a cold cathode fluorescent tube, and a display device using the same.
  • a display device provided with a liquid crystal panel as a flat display portion having many features such as a thinner and lighter than a conventional cathode ray tube. Is becoming mainstream.
  • a liquid crystal display device includes an illumination device (backlight) that emits light, and a liquid crystal panel that displays a desired image by serving as a shutter for light from a light source provided in the illumination device. Is provided.
  • information such as characters and images included in the video signal of the television broadcast is displayed on the display surface of the liquid crystal panel.
  • the illumination device is roughly classified into a direct type and an edge light type depending on the arrangement of the light source with respect to the liquid crystal panel.
  • a liquid crystal display device having a liquid crystal panel of 20 inches or more is higher than the edge light type.
  • a direct-type illumination device that is easy to increase in luminance and size is generally used.
  • the direct type lighting device is configured by arranging a plurality of light sources on the back (non-display surface) side of the liquid crystal panel, and since a light source can be arranged immediately behind the liquid crystal panel, a large number of light sources are used. Therefore, it is easy to obtain high luminance and suitable for high luminance and large size.
  • the direct type illumination device is suitable for high luminance and large size because the inside of the device has a hollow structure and is light even if it is large.
  • a cold cathode fluorescent tube as a light source is provided and the cold cathode fluorescent tube is lit. It has been proposed to connect a circuit (inverter circuit) and drive each cold cathode fluorescent tube by high-frequency lighting by the lighting circuit.
  • the lead wire led out from the end of the cold cathode fluorescent tube is electrically connected to the printed wiring provided on the circuit board.
  • the lamp side connector is fixed to the center portion of the circuit board, the lighting circuit side connector is electrically connected to the lamp side connector, and the lighting circuit is interposed via a wire harness. The side connector was connected to the lighting circuit.
  • the lead wire led out from the end portion of the cold cathode fluorescent tube is electrically connected to the printed wiring by performing soldering. For this reason, in the conventional lighting device, when the number of cold cathode fluorescent tubes is increased, the number of places to be soldered increases, and it takes time and labor to connect the cold cathode fluorescent tubes and the lighting circuit. The connection work could not be easily performed.
  • the present invention provides an illuminating device that can easily connect a discharge tube and an inverter circuit even when the number of discharge tubes is increased, and a display device using the same.
  • the purpose is to do.
  • an illumination device includes a plurality of discharge tubes and an inverter circuit that drives and drives the discharge tubes, A terminal portion electrically connected to an electrode portion provided at each end portion of the plurality of discharge tubes; a holding portion holding each end portion of the plurality of discharge tubes; and the inverter circuit side. And a connector provided integrally with the connecting portion, The plurality of discharge tubes and the inverter circuit are electrically connected using the connector.
  • the holding portion that holds the end portions of the plurality of discharge tubes and the connection portion that is connected to the inverter circuit side are integrally provided.
  • Connector is installed.
  • a plurality of discharge tubes and an inverter circuit are electrically connected using a connector.
  • connection portion is provided with a connection member that is electrically connected to an electrode terminal portion provided on the inverter circuit board.
  • each of the plurality of discharge tubes and the inverter circuit can be electrically connected without using wiring such as a cable, and these connection operations can be performed more easily.
  • the display device of the present invention is characterized by using any one of the above lighting devices.
  • an illuminating device that can easily connect the discharge tube and the inverter circuit even when the number of discharge tubes is increased is used.
  • a high-performance display device with excellent performance can be easily configured.
  • FIG. 3 is a diagram illustrating a configuration example of a CCFL drive circuit illustrated in FIG. 2. It is a disassembled perspective view which shows the vicinity of the connector shown in FIG. (A) is a top view which shows the said connector, (b) is sectional drawing which shows the internal structure of the said connector. It is a top view which shows the inverter circuit board shown in FIG.
  • FIG. 1 is a schematic cross-sectional view illustrating an illumination device and a liquid crystal display device according to an embodiment of the present invention.
  • the liquid crystal display device 1 of the present embodiment includes a liquid crystal panel 2 as a display unit in which the upper side in FIG. 1 is installed as a viewing side (display surface side), and a non-display surface side of the liquid crystal panel 2 (see FIG. 1). 1 is provided, and the illumination device 3 of the present invention that generates illumination light for illuminating the liquid crystal panel 2 is provided.
  • the liquid crystal panel 2 includes a liquid crystal layer 4, a pair of transparent substrates 5 and 6 that sandwich the liquid crystal layer 4, and polarizing plates 7 and 8 provided on the outer surfaces of the transparent substrates 5 and 6, respectively. Yes.
  • the liquid crystal panel 2 is provided with a driver 9 for driving the liquid crystal panel 2 and a drive circuit 10 connected to the driver 9 via the flexible printed circuit board 11. 4 can be driven pixel by pixel.
  • the polarization state of the illumination light incident through the polarizing plate 7 is modulated by the liquid crystal layer 4 and the amount of light passing through the polarizing plate 8 is controlled, so that a desired image is displayed. Is done.
  • the illuminating device 3 includes a bottomed chassis 12 having an opening on the upper side (liquid crystal panel 2 side) in FIG. 1 and a frame-like frame 13 installed on the liquid crystal panel 2 side of the chassis 12.
  • the chassis 12 constitutes a housing that houses a cold cathode fluorescent tube (discharge tube) described later.
  • the chassis 12 and the frame 13 are made of, for example, metal, and are sandwiched by a bezel 14 having an L-shaped cross section in a state where the liquid crystal panel 2 is installed above the frame 13. Thereby, the illuminating device 3 is assembled to the liquid crystal panel 2 and integrated as a transmissive liquid crystal display device 1 in which illumination light from the illuminating device 3 enters the liquid crystal panel 2.
  • the illumination device 3 is provided on the inner surface of the chassis 12, the diffusion plate 15 installed so as to cover the opening of the chassis 12, the optical sheet 17 installed on the liquid crystal panel 2 side above the diffusion plate 15. And a reflective sheet 19.
  • a plurality of, for example, six cold cathode fluorescent tubes 20 as discharge tubes are arranged in parallel with each other above the reflection sheet 19.
  • the cold cathode fluorescent tubes 20 are arranged at regular intervals (pitch) in the orthogonal direction (left-right direction in FIG. 1) orthogonal to the longitudinal direction, and are arranged at equal intervals. Light from the tube 20 is emitted as the illumination light from the light emitting surface of the illuminating device 3 arranged to face the liquid crystal panel 2.
  • the diffusion plate 15 is made of, for example, a rectangular synthetic resin or glass material having a thickness of about 2 mm, and diffuses light from the cold cathode fluorescent tube 20 (including light reflected by the reflection sheet 19). Then, the light is emitted to the optical sheet 17 side.
  • the diffusion plate 15 is mounted on a frame-like surface provided on the upper side of the chassis 12 on the four sides, and the surface of the chassis 12 and the surface of the frame 13 are interposed with an elastically deformable pressing member 16 interposed therebetween. It is incorporated in the lighting device 3 in a state of being held between the inner surface and the inner surface. Further, in the diffusing plate 15, a substantially central portion thereof is supported by a transparent support member (not shown) installed on the reflection sheet 19, and is prevented from being bent inside the chassis 12. .
  • the diffusion plate 15 is movably held between the chassis 12 and the pressing member 16, and the diffusion plate is affected by heat such as heat generation of the cold cathode fluorescent tube 20 and temperature rise inside the chassis 12. 15, even when expansion (plastic) deformation occurs, the pressing member 16 is elastically deformed so that the plastic deformation is absorbed and the diffusibility of light from the cold cathode fluorescent tube 20 is not reduced as much as possible. Yes. Further, the use of the diffusion plate 15 made of a glass material that is more resistant to heat than the synthetic resin is preferable in that warpage, yellowing, thermal deformation, and the like due to the influence of the heat are less likely to occur.
  • the optical sheet 17 includes a diffusion sheet made of, for example, a synthetic resin film having a thickness of about 0.5 mm, and appropriately diffuses the illumination light to the liquid crystal panel 2 to display the liquid crystal panel 2.
  • the display quality on the screen is improved.
  • a known optical sheet material such as a prism sheet or a polarizing sheet for improving the display quality on the display surface of the liquid crystal panel 2 is appropriately laminated on the optical sheet 17 as necessary.
  • the optical sheet 17 converts the light emitted from the diffusion plate 15 into planar light having a predetermined luminance (eg, 10000 cd / m 2 ) or more and substantially uniform luminance, and is used as illumination light for the liquid crystal panel. It is comprised so that it may inject into 2 side.
  • an optical member such as a diffusion sheet for adjusting the viewing angle of the liquid crystal panel 2 may be appropriately stacked above the liquid crystal panel 2 (display surface side).
  • a protruding portion that protrudes to the left in FIG. 1 is formed at the central portion on the left end side in FIG. 1 that is on the upper side when the liquid crystal display device 1 is actually used.
  • the protruding portion is sandwiched between the inner surface of the frame 13 and the pressing member 16 with the elastic material 18 interposed therebetween.
  • the optical sheet 17 can be expanded and contracted inside the lighting device 3. Built in state. Thereby, in the optical sheet 17, even when expansion / contraction (plastic) deformation occurs due to the influence of the heat such as the heat generation of the cold cathode fluorescent tube 20, free expansion / contraction deformation based on the protruding portion becomes possible.
  • the optical sheet 17 is configured to prevent wrinkles and deflections from occurring as much as possible. As a result, in the liquid crystal display device 1, it is possible to prevent the display quality of the liquid crystal panel 2 from being deteriorated as much as possible due to the bending of the optical sheet 17 or the like on the display surface of the liquid crystal panel 2.
  • the reflection sheet 19 is made of a metal thin film having a high light reflectance such as aluminum or silver having a thickness of about 0.2 to 0.5 mm, for example, and reflects the light from the cold cathode fluorescent tube 20 toward the diffusion plate 15. To function as a reflector. Thereby, in the illuminating device 3, the light emitted from the cold cathode fluorescent tube 20 can be efficiently reflected to the diffusion plate 15 side, and the use efficiency of the light and the luminance at the diffusion plate 15 can be increased.
  • a reflective sheet material made of synthetic resin is used in place of the metal thin film, or the inner surface of the chassis 12 is reflected by applying a paint having a high light reflectance such as white. It can also function as a plate.
  • Each of the cold cathode fluorescent tubes 20 is a straight tube fluorescent lamp type.
  • each cold cathode fluorescent tube 20 is a thin tube having a diameter of about 3.0 to 4.0 mm and excellent in luminous efficiency.
  • Each cold cathode fluorescent tube 20 includes a light source holder (not shown).
  • the distance between each of the diffusion plate 15 and the reflection sheet 19 is held in the chassis 12 in a state where the distance is maintained at a predetermined distance.
  • the cold cathode fluorescent tube 20 is arranged so that its longitudinal direction is parallel to a direction orthogonal to the direction of gravity action. As a result, in the cold cathode fluorescent tube 20, mercury (vapor) enclosed therein is prevented from gathering on one end side in the longitudinal direction due to the action of gravity, and the lamp life is greatly improved. Yes.
  • each cold cathode fluorescent tube 20 the electrode part provided in the both ends is each electrically connected with the connector 21, and each cold cathode fluorescent tube 20 has two pieces so that it may explain in full detail later. It is pulled out of the chassis 12 through a connector 21 provided for each cold cathode fluorescent tube. And in the illuminating device 3, each cold cathode fluorescent tube 20 is connected to the below-mentioned CCFL lighting drive circuit (inverter circuit), and is lighted and driven by PWM dimming, for example.
  • CCFL lighting drive circuit inverter circuit
  • FIG. 2 is a diagram for explaining a configuration of a main part of the lighting device
  • FIG. 3 is a diagram for explaining a configuration example of the CCFL driving circuit shown in FIG.
  • the illumination device 3 is provided with a control unit 30 for performing drive control of each of the plurality of cold cathode fluorescent tubes 20 and a drive signal from the control unit 30 provided for each cold cathode fluorescent tube 20.
  • a CCFL driving circuit T for lighting and driving the corresponding cold cathode fluorescent tube 20.
  • the CCFL driving circuit T is installed on one end side in the longitudinal direction of each cold cathode fluorescent tube 20, and is configured to supply current to the corresponding cold cathode fluorescent tube 20 from the one end side. ing.
  • the CCFL drive circuit T uses an inverter circuit described later, and the CCFL drive circuit T is configured to be able to drive the corresponding cold cathode fluorescent tube 20 using PWM dimming based on the drive signal. Has been.
  • the illuminating device 3 includes a lamp current detection circuit RC that is provided for each cold cathode fluorescent tube 20 and detects a lamp current value that flows through the corresponding cold cathode fluorescent tube 20.
  • the lamp current value detected by the lamp current detection circuit RC is output to the control unit 30 via the feedback circuits FB1, FB2, FB3, FB4, FB5, and FB6 installed according to each cold cathode fluorescent tube 20. It has become.
  • a dimming instruction signal for changing the luminance of the light emitting surface of the lighting device 3 is input to the control unit 30 as an instruction signal from the outside.
  • the brightness (brightness) on the display surface of the panel 2 can be changed as appropriate.
  • the control unit 30 is configured to receive a dimming instruction signal from an operation input device (not shown) such as a remote controller provided on the liquid crystal display device 1 side, for example. Then, the control unit 30 determines a duty ratio in PWM dimming using the input dimming instruction signal and determines a target value of a supply current to each cold cathode fluorescent tube 20.
  • control unit 30 generates and outputs a drive signal to each CCFL drive circuit T based on the determined target value, whereby the value of the lamp current flowing through the corresponding cold cathode fluorescent tube 20 changes.
  • the amount of the emitted light emitted from each cold cathode fluorescent tube 20 changes according to the dimming instruction signal, and the luminance on the light emitting surface of the illumination device 3 and the luminance on the display surface of the liquid crystal panel 2 are changed. It is changed appropriately according to the user's operation instruction.
  • the lamp current value actually supplied to each cold cathode fluorescent tube 20 is fed back to the control unit 30 as a detected current value via the corresponding lamp current detection circuit RC and feedback circuits FB1 to FB6. Then, the control unit 30 performs feedback control using the detected current value and the target value of the supply current determined based on the dimming instruction signal, so that the display at the brightness desired by the user is performed. Maintained.
  • the CCFL driving circuit T is connected to the transformer T1 and the control unit 30, and the transistors T2 and T3 provided on the primary winding side of the transformer T1 and the transistor T2 are connected to the transistor T2.
  • An inverter circuit having a connected power supply VCC is used, and the CCFL driving circuit T is adapted to light up the connected cold cathode fluorescent tube 20 at a high frequency. That is, the high-voltage side terminal of any one of the cold cathode fluorescent tubes 20 is connected to the secondary winding of the transformer T1, and the transistors T2 and T3 perform a switching operation based on the drive signal from the control unit 30.
  • the transformer T1 supplies power from the power supply VCC to the corresponding cold cathode fluorescent tube 20, and turns on the cold cathode fluorescent tube 20.
  • transistors T2 and T3 each configured by using an FET and a power supply VCC are integrally configured as a control IC T4.
  • a transformer T1 and a control IC T4 are mounted on an inverter circuit board described later.
  • FIG. 4 is an exploded perspective view showing the vicinity of the connector shown in FIG.
  • FIG. 5A is a plan view showing the connector
  • FIG. 5B is a cross-sectional view showing the internal configuration of the connector.
  • FIG. 6 is a plan view showing the inverter circuit board shown in FIG.
  • connectors 21 are attached to the end portions of two cold cathode fluorescent tubes 20, and each of these cold cathode fluorescent tubes 20 has a connector 21. It is electrically connected to a CCFL drive circuit T mounted on the inverter circuit board 24 with an intervening space.
  • the connector 21 is provided for each cold cathode fluorescent tube 20 and the end of the cold cathode fluorescent tube 20 is inserted.
  • a substantially rectangular parallelepiped holding portion 22 and a rectangular parallelepiped connection portion 23 connected to the CCFL drive circuit T side are provided.
  • the holding portion 22 and the connecting portion 23 are integrally formed by, for example, an injection molding method.
  • the holding portion 22 is made of, for example, a synthetic resin, and has a holding portion main body 22a through which the end of the cold cathode fluorescent tube 20 is inserted, and a cold cathode fluorescent tube.
  • the terminal part 22b electrically connected with the electrode part 20a provided in the edge part of 20 is provided.
  • connection portion 23 is configured using, for example, a synthetic resin, and a connection portion main body 23a inserted into a rectangular attachment hole 12a (FIG. 4) formed in the chassis 12, and a connection portion main body 23a.
  • Two connection members 23b that are formed inside and are electrically connected to the two terminal portions 22b are provided.
  • the inverter circuit board 24 is provided with a connector member 24 a that engages with the connector 21 on the surface arranged to face the chassis 12. That is, the connector member 24 a is provided with a rectangular opening, and the inverter circuit board 24 is attached to the chassis 12 so that the opening faces the attachment hole 12 a of the chassis 12.
  • the connector member 24 a is provided with two electrode terminal portions 24 a 1, and these two electrode terminal portions 24 a 1 are electrically connected to two connection members 23 b provided at the connection portion 23 of the connector 21, respectively. It has become so.
  • each electrode terminal portion 23a1 has an insertion hole 24a2 into which the connection member 23b is inserted, and when the connector 21 and the connector member 24a are engaged, the connection member 23b is inserted into the insertion hole 24a2. And electrically connected to the electrode terminal portion 23a1.
  • the transformer T1 and the control IC T4 included in the CCFL driving circuit T are mounted on the surface opposite to the surface facing the chassis 12 (the back surface in FIG. 6), and each electrode terminal The part 23a1 is electrically connected to the transformer T1.
  • the left and right connectors 21 are engaged with the connector member 24a.
  • the assembly work of the two cold cathode fluorescent tubes 20 is completed.
  • the inverter circuit board 24 is provided with two screw holes 24 b, and the inverter circuit board 24 is connected to the chassis 12 by the screws 29 inserted into these screw holes 24 b. It is supposed to be fixed.
  • the illuminating device 3 of the present embodiment configured as described above has a terminal portion 22b that is electrically connected to the electrode portion 20a of the cold cathode fluorescent tube (discharge tube) 20, and includes two cold cathode fluorescent tubes.
  • a connector 21 is provided in which a holding portion 22 that holds each end portion and a connection portion 23 that is connected to the CCFL drive circuit (inverter circuit) T side are integrally provided.
  • the plurality of cold cathode fluorescent tubes 20 and the CCFL drive circuit T are electrically connected using the connector 21.
  • connection part 23b electrically connected to the electrode terminal part 24a1 provided in the inverter circuit board 24 is provided in the connection part 23 of the connector 21, a cable etc.
  • the plurality of cold-cathode fluorescent tubes 20 and the CCFL driving circuit T can be electrically connected without using the above wiring, and these connection operations can be performed more easily.
  • the illumination device 3 is used that can easily connect the cold cathode fluorescent tube 20 and the CCFL driving circuit T even when the number of the cold cathode fluorescent tubes 20 is increased. Therefore, the high-performance liquid crystal display device 1 excellent in assembly workability can be easily configured.
  • the lighting device of the present invention is not limited to this, and the image,
  • the present invention can be applied to various display devices including a non-light emitting display unit that displays information such as characters.
  • the illumination device of the present invention can be suitably used for a transflective liquid crystal display device or a projection display device using a liquid crystal panel as a light valve.
  • the present invention is installed on a light box for illuminating X-ray film or photographic negatives for irradiating light to make it easy to see, or on a signboard or a wall in a station. It can be suitably used as a lighting device for a light emitting device that illuminates advertisements and the like.
  • the discharge tube of the present invention is not limited to this, and other discharge fluorescent tubes such as a hot cathode fluorescent tube and a xenon fluorescent tube are used.
  • a non-straight tubular discharge fluorescent tube such as a U-shaped tube or a pseudo-U-shaped tube may be used.
  • a long-life lighting device having discharge tubes arranged in parallel to the direction of gravity can be configured.
  • an inverter circuit is provided on one end of the cold cathode fluorescent tube, and power is supplied from the one end to the cold cathode fluorescent tube.
  • the present invention is not limited to this, and the present invention can also be applied to a configuration in which an inverter circuit is provided on the other end side and the cold cathode fluorescent tube is driven on both sides.
  • the connector of the present invention is not limited to this, and the present invention is also applicable to a plurality of three or more discharge tubes. Can be applied. That is, according to the number of discharge tubes, a plurality of the holding portions may be provided, and the plurality of holding portions and the connecting portion may be configured integrally.
  • the present invention is useful for an illumination device that can easily connect the discharge tube and the inverter circuit, and a display device using the same even when the number of discharge tubes is increased.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Liquid Crystal (AREA)
  • Planar Illumination Modules (AREA)

Abstract

An illuminating device (3) is provided with a plurality of cold cathode fluorescent tubes (discharge tubes) (20), and a CCFL driving circuit (inverter circuit) (T) which drives to light the cold cathode fluorescent tubes (20). The illuminating device is also provided with a connector (21) wherein a holding section (22) and a connecting section (23) are integrally arranged. The holding section has a terminal section (22b), which is electrically connected with an electrode section (20a) arranged on each end section of the cold cathode fluorescent tubes (20), and holds each end section of the cold cathode fluorescent tubes (20). The connecting section is connected with the side of the CCFL driving circuit. The cold cathode fluorescent tubes (20) and the CCFL driving circuit (T) are electrically connected by using the connector (21).

Description

照明装置、及び表示装置Lighting device and display device
　本発明は、照明装置、特に冷陰極蛍光管などの放電管を使用した照明装置、及びこれを用いた表示装置に関する。 The present invention relates to a lighting device, particularly a lighting device using a discharge tube such as a cold cathode fluorescent tube, and a display device using the same.
　近年、例えば家庭用のテレビ受信装置では、液晶表示装置に代表されるように、在来のブラウン管に比べ薄型、軽量等の多くの特長を有するフラットな表示部としての液晶パネルを備えた表示装置が主流になりつつある。このような液晶表示装置には、光を発光する照明装置（バックライト）と、照明装置に設けられた光源からの光に対してシャッターの役割を果たすことで、所望画像を表示する液晶パネルとが設けられている。そして、テレビ受信装置では、テレビ放送の映像信号に含まれた文字、画像等の情報を液晶パネルの表示面上に表示するようになっている。 In recent years, for example, in a television receiver for home use, as represented by a liquid crystal display device, a display device provided with a liquid crystal panel as a flat display portion having many features such as a thinner and lighter than a conventional cathode ray tube. Is becoming mainstream. Such a liquid crystal display device includes an illumination device (backlight) that emits light, and a liquid crystal panel that displays a desired image by serving as a shutter for light from a light source provided in the illumination device. Is provided. In the television receiver, information such as characters and images included in the video signal of the television broadcast is displayed on the display surface of the liquid crystal panel.
　また、上記照明装置では、液晶パネルに対する光源の配置の仕方によって直下型とエッジライト型とに大別されるが、２０インチ以上の液晶パネルを備えた液晶表示装置では、エッジライト型よりも高輝度・大型化を図り易い直下型の照明装置が一般的に使用されている。すなわち、直下型の照明装置は、液晶パネルの背後（非表示面）側に、複数の光源を配置して構成されており、液晶パネルのすぐ裏側に光源を配置できるため、多数の光源を使用することが可能となり、高輝度が得やすく高輝度・大型化に適している。また、直下型の照明装置は、装置内部が中空構造であるため、大型化しても軽量であることからも、高輝度・大型化に適している。 The illumination device is roughly classified into a direct type and an edge light type depending on the arrangement of the light source with respect to the liquid crystal panel. However, a liquid crystal display device having a liquid crystal panel of 20 inches or more is higher than the edge light type. A direct-type illumination device that is easy to increase in luminance and size is generally used. In other words, the direct type lighting device is configured by arranging a plurality of light sources on the back (non-display surface) side of the liquid crystal panel, and since a light source can be arranged immediately behind the liquid crystal panel, a large number of light sources are used. Therefore, it is easy to obtain high luminance and suitable for high luminance and large size. In addition, the direct type illumination device is suitable for high luminance and large size because the inside of the device has a hollow structure and is light even if it is large.
　また、上記のような従来の直下型の照明装置では、例えば特開平８－４５３２７号公報に記載されているように、光源としての冷陰極蛍光管を設けるとともに、冷陰極蛍光管に対して点灯回路（インバータ回路）を接続し、当該点灯回路による高周波点灯によって各冷陰極蛍光管を駆動することが提案されている。また、この従来の照明装置では、冷陰極蛍光管の端部から導出されたリード線を回路基板に設けたプリント配線に電気的に接続していた。また、この従来の照明装置では、回路基板の中央部にランプ側コネクタを固定するとともに、このランプ側コネクタに対して、点灯回路側コネクタを電気的に接続し、ワイヤハーネスを介在させて点灯回路側コネクタを点灯回路に接続していた。 Further, in the conventional direct type illumination device as described above, for example, as described in JP-A-8-45327, a cold cathode fluorescent tube as a light source is provided and the cold cathode fluorescent tube is lit. It has been proposed to connect a circuit (inverter circuit) and drive each cold cathode fluorescent tube by high-frequency lighting by the lighting circuit. In this conventional lighting device, the lead wire led out from the end of the cold cathode fluorescent tube is electrically connected to the printed wiring provided on the circuit board. Further, in this conventional lighting device, the lamp side connector is fixed to the center portion of the circuit board, the lighting circuit side connector is electrically connected to the lamp side connector, and the lighting circuit is interposed via a wire harness. The side connector was connected to the lighting circuit.
　しかしながら、上記のような従来の照明装置では、上記液晶パネルの大画面化などに応じて、冷陰極蛍光管（放電管）の設置数を増加させたときに、冷陰極蛍光管と点灯回路（インバータ回路）との接続作業を簡単に行えないという問題点があった。 However, in the conventional lighting device as described above, when the number of cold cathode fluorescent tubes (discharge tubes) is increased in accordance with an increase in the screen size of the liquid crystal panel, the cold cathode fluorescent tube and the lighting circuit ( There was a problem that the connection work with the inverter circuit could not be performed easily.
　具体的にいえば、上記従来の照明装置では、ハンダ付けを行うことにより、冷陰極蛍光管の端部から導出されたリード線をプリント配線に電気的に接続していた。このため、従来の照明装置では、冷陰極蛍光管の設置数を増加させたときに、ハンダ付けを行う箇所も増加し、冷陰極蛍光管と点灯回路との接続作業に時間及び手間を要して、当該接続作業を簡単に行えなかった。 Specifically, in the conventional lighting device, the lead wire led out from the end portion of the cold cathode fluorescent tube is electrically connected to the printed wiring by performing soldering. For this reason, in the conventional lighting device, when the number of cold cathode fluorescent tubes is increased, the number of places to be soldered increases, and it takes time and labor to connect the cold cathode fluorescent tubes and the lighting circuit. The connection work could not be easily performed.
　上記の課題を鑑み、本発明は、放電管の設置数を増加させたときでも、放電管とインバータ回路との接続作業を簡単に行うことができる照明装置、及びこれを用いた表示装置を提供することを目的とする。 In view of the above-described problems, the present invention provides an illuminating device that can easily connect a discharge tube and an inverter circuit even when the number of discharge tubes is increased, and a display device using the same. The purpose is to do.
　上記の目的を達成するために、本発明にかかる照明装置は、複数の放電管と、前記放電管を点灯駆動するインバータ回路を備えた照明装置であって、
　前記複数の放電管の各端部に設けられた電極部と電気的に接続する端子部を有し、前記複数の放電管の各端部を保持する保持部と、前記インバータ回路側に接続される接続部とが一体的に設けられたコネクタを備え、
　前記コネクタを使用して、前記複数の各放電管と前記インバータ回路とを電気的に接続したことを特徴とするものである。 In order to achieve the above object, an illumination device according to the present invention includes a plurality of discharge tubes and an inverter circuit that drives and drives the discharge tubes,
A terminal portion electrically connected to an electrode portion provided at each end portion of the plurality of discharge tubes; a holding portion holding each end portion of the plurality of discharge tubes; and the inverter circuit side. And a connector provided integrally with the connecting portion,
The plurality of discharge tubes and the inverter circuit are electrically connected using the connector.
　上記のように構成された照明装置では、上記端子部を有し、複数の放電管の各端部を保持する保持部と、インバータ回路側に接続される接続部とが一体的に設けられたコネクタが設置されている。また、照明装置では、コネクタを使用して、複数の各放電管とインバータ回路とを電気的に接続している。これにより、上記従来例と異なり、放電管の設置数を増加させたときでも、放電管とインバータ回路との接続作業を簡単に行うことができる。 In the lighting device configured as described above, the holding portion that holds the end portions of the plurality of discharge tubes and the connection portion that is connected to the inverter circuit side are integrally provided. Connector is installed. In the lighting device, a plurality of discharge tubes and an inverter circuit are electrically connected using a connector. Thus, unlike the conventional example, even when the number of discharge tubes is increased, the connection work between the discharge tubes and the inverter circuit can be easily performed.
　また、上記照明装置において、前記インバータ回路が実装されたインバータ回路基板を備えるとともに、
　前記接続部には、前記インバータ回路基板に設けられた電極端子部に電気的に接続される接続部材が設けられていることが好ましい。 Moreover, in the said illuminating device, while providing the inverter circuit board by which the said inverter circuit was mounted,
It is preferable that the connection portion is provided with a connection member that is electrically connected to an electrode terminal portion provided on the inverter circuit board.
　この場合、ケーブルなどの配線を使用することなく、複数の各放電管とインバータ回路とを電気的に接続することができ、これら接続作業をより簡単に行うことができる。 In this case, each of the plurality of discharge tubes and the inverter circuit can be electrically connected without using wiring such as a cable, and these connection operations can be performed more easily.
　また、本発明の表示装置は、上記いずれかの照明装置を用いたことを特徴とするものである。 The display device of the present invention is characterized by using any one of the above lighting devices.
　上記のように構成された表示装置では、放電管の設置数を増加させたときでも、放電管とインバータ回路との接続作業を簡単に行うことができる照明装置が用いられているので、組立作業性に優れた高性能な表示装置を容易に構成することができる。 In the display device configured as described above, an illuminating device that can easily connect the discharge tube and the inverter circuit even when the number of discharge tubes is increased is used. A high-performance display device with excellent performance can be easily configured.
　本発明によれば、放電管の設置数を増加させたときでも、放電管とインバータ回路との接続作業を簡単に行うことができる照明装置、及びこれを用いた表示装置を提供することが可能となる。 ADVANTAGE OF THE INVENTION According to this invention, even when it increases the number of installation of a discharge tube, it is possible to provide the illuminating device which can perform the connection operation | work of a discharge tube and an inverter circuit easily, and a display apparatus using the same. It becomes.
本発明の一実施形態にかかる照明装置及び液晶表示装置を説明する概略断面図である。It is a schematic sectional drawing explaining the illuminating device and liquid crystal display device concerning one Embodiment of this invention. 上記照明装置の要部構成を説明する図である。It is a figure explaining the principal part structure of the said illuminating device. 図２に示したＣＣＦＬ駆動回路の構成例を説明する図である。FIG. 3 is a diagram illustrating a configuration example of a CCFL drive circuit illustrated in FIG. 2. 図１に示したコネクタの近傍を示す分解斜視図である。It is a disassembled perspective view which shows the vicinity of the connector shown in FIG. （ａ）は上記コネクタを示す平面図であり、（ｂ）は上記コネクタの内部構成を示す断面図である。(A) is a top view which shows the said connector, (b) is sectional drawing which shows the internal structure of the said connector. 図４に示したインバータ回路基板を示す平面図である。It is a top view which shows the inverter circuit board shown in FIG.
　以下、本発明の照明装置、及びこれを用いた表示装置の好ましい実施形態について、図面を参照しながら説明する。なお、以下の説明では、本発明を透過型の液晶表示装置に適用した場合を例示して説明する。また、各図中の構成部材の寸法は、実際の構成部材の寸法及び各構成部材の寸法比率等を忠実に表したものではない。 Hereinafter, preferred embodiments of the illumination device of the present invention and a display device using the same will be described with reference to the drawings. In the following description, the case where the present invention is applied to a transmissive liquid crystal display device will be described as an example. Moreover, the dimension of the structural member in each figure does not faithfully represent the actual dimension of the structural member, the dimensional ratio of each structural member, or the like.
　図１は、本発明の一実施形態にかかる照明装置及び液晶表示装置を説明する概略断面図である。図１において、本実施形態の液晶表示装置１には、図１の上側が視認側（表示面側）として設置される表示部としての液晶パネル２と、液晶パネル２の非表示面側（図１の下側）に配置されて、当該液晶パネル２を照明する照明光を発生する本発明の照明装置３とが設けられている。 FIG. 1 is a schematic cross-sectional view illustrating an illumination device and a liquid crystal display device according to an embodiment of the present invention. 1, the liquid crystal display device 1 of the present embodiment includes a liquid crystal panel 2 as a display unit in which the upper side in FIG. 1 is installed as a viewing side (display surface side), and a non-display surface side of the liquid crystal panel 2 (see FIG. 1). 1 is provided, and the illumination device 3 of the present invention that generates illumination light for illuminating the liquid crystal panel 2 is provided.
　液晶パネル２は、液晶層４と、液晶層４を狭持する一対の透明基板５、６と、透明基板５、６の各外側表面上にそれぞれ設けられた偏光板７、８とを備えている。また、液晶パネル２には、当該液晶パネル２を駆動するためのドライバ９、及びフレキシブルプリント基板１１を介してドライバ９に接続された駆動回路１０が設けられており、液晶パネル２では、液晶層４を画素単位に駆動可能に構成されている。そして、液晶パネル２では、液晶層４によって偏光板７を介して入射された上記照明光の偏光状態が変調され、かつ、偏光板８を通過する光量が制御されることにより、所望画像が表示される。 The liquid crystal panel 2 includes a liquid crystal layer 4, a pair of transparent substrates 5 and 6 that sandwich the liquid crystal layer 4, and polarizing plates 7 and 8 provided on the outer surfaces of the transparent substrates 5 and 6, respectively. Yes. The liquid crystal panel 2 is provided with a driver 9 for driving the liquid crystal panel 2 and a drive circuit 10 connected to the driver 9 via the flexible printed circuit board 11. 4 can be driven pixel by pixel. In the liquid crystal panel 2, the polarization state of the illumination light incident through the polarizing plate 7 is modulated by the liquid crystal layer 4 and the amount of light passing through the polarizing plate 8 is controlled, so that a desired image is displayed. Is done.
　照明装置３は、図１の上側（液晶パネル２側）が開口した有底状のシャーシ１２と、シャーシ１２の液晶パネル２側に設置された枠状のフレーム１３とを備えている。シャーシ１２は、後述の冷陰極蛍光管（放電管）を収容する筐体を構成している。また、シャーシ１２及びフレーム１３は、例えば金属によって構成されており、フレーム１３の上方に液晶パネル２が設置された状態で、断面Ｌ字状のベゼル１４にて狭持されている。これにより、照明装置３は、液晶パネル２に組み付けられて、当該照明装置３からの照明光が液晶パネル２に入射される透過型の液晶表示装置１として一体化されている。 The illuminating device 3 includes a bottomed chassis 12 having an opening on the upper side (liquid crystal panel 2 side) in FIG. 1 and a frame-like frame 13 installed on the liquid crystal panel 2 side of the chassis 12. The chassis 12 constitutes a housing that houses a cold cathode fluorescent tube (discharge tube) described later. The chassis 12 and the frame 13 are made of, for example, metal, and are sandwiched by a bezel 14 having an L-shaped cross section in a state where the liquid crystal panel 2 is installed above the frame 13. Thereby, the illuminating device 3 is assembled to the liquid crystal panel 2 and integrated as a transmissive liquid crystal display device 1 in which illumination light from the illuminating device 3 enters the liquid crystal panel 2.
　また、照明装置３は、シャーシ１２の開口部を覆うように設置された拡散板１５と、拡散板１５の上方で液晶パネル２側に設置された光学シート１７と、シャーシ１２の内面に設けられた反射シート１９とを備えている。また、照明装置３では、反射シート１９の上方に、放電管としての複数、例えば６本の冷陰極蛍光管２０が、互いに平行に配列されている。また、これらの各冷陰極蛍光管２０は、その長手方向に直交する直交方向（図１の左右方向）で一定の間隔（ピッチ）寸法をおいて等間隔に配列されており、各冷陰極蛍光管２０からの光が液晶パネル２に対向配置される照明装置３の発光面から上記照明光として出射されるようになっている。 The illumination device 3 is provided on the inner surface of the chassis 12, the diffusion plate 15 installed so as to cover the opening of the chassis 12, the optical sheet 17 installed on the liquid crystal panel 2 side above the diffusion plate 15. And a reflective sheet 19. In the illumination device 3, a plurality of, for example, six cold cathode fluorescent tubes 20 as discharge tubes are arranged in parallel with each other above the reflection sheet 19. In addition, the cold cathode fluorescent tubes 20 are arranged at regular intervals (pitch) in the orthogonal direction (left-right direction in FIG. 1) orthogonal to the longitudinal direction, and are arranged at equal intervals. Light from the tube 20 is emitted as the illumination light from the light emitting surface of the illuminating device 3 arranged to face the liquid crystal panel 2.
　拡散板１５は、例えば厚さ２ｍｍ程度の長方形状の合成樹脂またはガラス材を用いて構成されており、冷陰極蛍光管２０からの光（反射シート１９で反射された光を含む。）を拡散して、光学シート１７側に出射する。また、拡散板１５は、その四辺側がシャーシ１２の上側に設けられた枠状の表面上に載置されており、弾性変形可能な押圧部材１６を介在させてシャーシ１２の当該表面とフレーム１３の内面とで狭持された状態で照明装置３の内部に組み込まれている。さらに、拡散板１５では、その略中央部が反射シート１９上に設置された透明な支持部材（図示せず）にて支えられており、シャーシ１２の内側に撓むのが防がれている。 The diffusion plate 15 is made of, for example, a rectangular synthetic resin or glass material having a thickness of about 2 mm, and diffuses light from the cold cathode fluorescent tube 20 (including light reflected by the reflection sheet 19). Then, the light is emitted to the optical sheet 17 side. The diffusion plate 15 is mounted on a frame-like surface provided on the upper side of the chassis 12 on the four sides, and the surface of the chassis 12 and the surface of the frame 13 are interposed with an elastically deformable pressing member 16 interposed therebetween. It is incorporated in the lighting device 3 in a state of being held between the inner surface and the inner surface. Further, in the diffusing plate 15, a substantially central portion thereof is supported by a transparent support member (not shown) installed on the reflection sheet 19, and is prevented from being bent inside the chassis 12. .
　また、拡散板１５は、シャーシ１２と押圧部材１６との間で移動可能に保持されており、冷陰極蛍光管２０の発熱やシャーシ１２の内部の温度上昇などの熱の影響により、当該拡散板１５に伸縮（塑性）変形が生じたときでも、押圧部材１６が弾性変形することにて当該塑性変形が吸収されて、冷陰極蛍光管２０からの光の拡散性を極力低下しないようになっている。また、合成樹脂に比べて熱に強いガラス材の拡散板１５を用いる場合の方が、上記熱の影響による反り、黄変、熱変形等が生じ難い点で好ましい。 Further, the diffusion plate 15 is movably held between the chassis 12 and the pressing member 16, and the diffusion plate is affected by heat such as heat generation of the cold cathode fluorescent tube 20 and temperature rise inside the chassis 12. 15, even when expansion (plastic) deformation occurs, the pressing member 16 is elastically deformed so that the plastic deformation is absorbed and the diffusibility of light from the cold cathode fluorescent tube 20 is not reduced as much as possible. Yes. Further, the use of the diffusion plate 15 made of a glass material that is more resistant to heat than the synthetic resin is preferable in that warpage, yellowing, thermal deformation, and the like due to the influence of the heat are less likely to occur.
　光学シート１７には、例えば厚さ０．５ｍｍ程度の合成樹脂フィルムにて構成された拡散シートが含まれており、液晶パネル２への上記照明光を適度に拡散して当該液晶パネル２の表示面での表示品位を向上させるように構成されている。また、光学シート１７には、液晶パネル２の表示面での表示品位の向上を行うためなどのプリズムシート、偏光シートなどの公知の光学シート材が必要に応じて適宜積層されるようになっている。そして、光学シート１７は、拡散板１５から出射された光を、所定の輝度（例えば、１００００ｃｄ／ｍ2）以上で、かつ、ほぼ均一な輝度を有する面状光に変換し照明光として液晶パネル２側に入射させるように構成されている。なお、上記の説明以外に、例えば液晶パネル２の上方（表示面側）に当該液晶パネル２の視野角を調整するための拡散シートなどの光学部材を適宜積層してもよい。 The optical sheet 17 includes a diffusion sheet made of, for example, a synthetic resin film having a thickness of about 0.5 mm, and appropriately diffuses the illumination light to the liquid crystal panel 2 to display the liquid crystal panel 2. The display quality on the screen is improved. In addition, a known optical sheet material such as a prism sheet or a polarizing sheet for improving the display quality on the display surface of the liquid crystal panel 2 is appropriately laminated on the optical sheet 17 as necessary. Yes. The optical sheet 17 converts the light emitted from the diffusion plate 15 into planar light having a predetermined luminance (eg, 10000 cd / m 2 ) or more and substantially uniform luminance, and is used as illumination light for the liquid crystal panel. It is comprised so that it may inject into 2 side. In addition to the above description, for example, an optical member such as a diffusion sheet for adjusting the viewing angle of the liquid crystal panel 2 may be appropriately stacked above the liquid crystal panel 2 (display surface side).
　また、光学シート１７では、例えば液晶表示装置１の実使用時に上側となる、図１の左端辺側の中央部に、同図の左側に突出した突出部が形成されている。そして、光学シート１７では、上記突出部だけが弾性材１８を介在させてフレーム１３の内面と押圧部材１６とで狭持されており、当該光学シート１７は、照明装置３の内部に伸縮可能な状態で組み込まれている。これにより、光学シート１７では、冷陰極蛍光管２０の発熱等の上記の熱の影響により、伸縮（塑性）変形が生じたときでも、上記突出部を基準とした自由な伸縮変形が可能となり、シワや撓みなどが当該光学シート１７に発生するのが極力防がれるように構成されている。この結果、液晶表示装置１では、光学シート１７の撓み等に起因して、輝度ムラなどの表示品位の低下が液晶パネル２の表示面に発生するのを極力防止できるようになっている。 Further, in the optical sheet 17, for example, a protruding portion that protrudes to the left in FIG. 1 is formed at the central portion on the left end side in FIG. 1 that is on the upper side when the liquid crystal display device 1 is actually used. In the optical sheet 17, only the protruding portion is sandwiched between the inner surface of the frame 13 and the pressing member 16 with the elastic material 18 interposed therebetween. The optical sheet 17 can be expanded and contracted inside the lighting device 3. Built in state. Thereby, in the optical sheet 17, even when expansion / contraction (plastic) deformation occurs due to the influence of the heat such as the heat generation of the cold cathode fluorescent tube 20, free expansion / contraction deformation based on the protruding portion becomes possible. The optical sheet 17 is configured to prevent wrinkles and deflections from occurring as much as possible. As a result, in the liquid crystal display device 1, it is possible to prevent the display quality of the liquid crystal panel 2 from being deteriorated as much as possible due to the bending of the optical sheet 17 or the like on the display surface of the liquid crystal panel 2.
　反射シート１９は、例えば厚さ０．２～０．５ｍｍ程度のアルミニウムや銀などの光反射率の高い金属薄膜により構成されており、冷陰極蛍光管２０の光を拡散板１５に向かって反射する反射板として機能するようになっている。これにより、照明装置３では、冷陰極蛍光管２０から発光された光を拡散板１５側に効率よく反射して当該光の利用効率及び拡散板１５での輝度を高めることができる。なお、この説明以外に、上記金属薄膜に代えて、合成樹脂製の反射シート材を使用したり、例えばシャーシ１２の内面に光反射率の高い白色等の塗料を塗布することによって当該内面を反射板として機能させたりすることもできる。 The reflection sheet 19 is made of a metal thin film having a high light reflectance such as aluminum or silver having a thickness of about 0.2 to 0.5 mm, for example, and reflects the light from the cold cathode fluorescent tube 20 toward the diffusion plate 15. To function as a reflector. Thereby, in the illuminating device 3, the light emitted from the cold cathode fluorescent tube 20 can be efficiently reflected to the diffusion plate 15 side, and the use efficiency of the light and the luminance at the diffusion plate 15 can be increased. In addition to this description, a reflective sheet material made of synthetic resin is used in place of the metal thin film, or the inner surface of the chassis 12 is reflected by applying a paint having a high light reflectance such as white. It can also function as a plate.
　各冷陰極蛍光管２０には、直管状の蛍光ランプタイプのものが用いられている。また、各冷陰極蛍光管２０には、直径３．０～４．０ｍｍ程度の発光効率に優れた細管化されたものが使用されており、各冷陰極蛍光管２０は、図示しない光源保持具によって拡散板１５及び反射シート１９との各間の距離を所定距離に保たれた状態で、シャーシ１２の内部に保持されている。さらに、冷陰極蛍光管２０は、その長手方向が重力の作用方向と直交する方向に平行となるように、配置されている。これにより、冷陰極蛍光管２０では、その内部に封入された水銀（蒸気）が重力の作用により長手方向の一方の端部側に集まるのが防がれて、ランプ寿命が大幅に向上されている。 Each of the cold cathode fluorescent tubes 20 is a straight tube fluorescent lamp type. In addition, each cold cathode fluorescent tube 20 is a thin tube having a diameter of about 3.0 to 4.0 mm and excellent in luminous efficiency. Each cold cathode fluorescent tube 20 includes a light source holder (not shown). Thus, the distance between each of the diffusion plate 15 and the reflection sheet 19 is held in the chassis 12 in a state where the distance is maintained at a predetermined distance. Further, the cold cathode fluorescent tube 20 is arranged so that its longitudinal direction is parallel to a direction orthogonal to the direction of gravity action. As a result, in the cold cathode fluorescent tube 20, mercury (vapor) enclosed therein is prevented from gathering on one end side in the longitudinal direction due to the action of gravity, and the lamp life is greatly improved. Yes.
　また、各冷陰極蛍光管２０では、その両端部に設けられた電極部がそれぞれコネクタ２１と電気的に接続されており、各冷陰極蛍光管２０は、後に詳述するように、２本の冷陰極蛍光管毎に設けられたコネクタ２１を介してシャーシ１２の外部に引き出されている。そして、照明装置３では、各冷陰極蛍光管２０は、後述のＣＣＦＬ点灯駆動回路（インバータ回路）に接続されて、例えばＰＷＭ調光によって点灯駆動される。 Moreover, in each cold cathode fluorescent tube 20, the electrode part provided in the both ends is each electrically connected with the connector 21, and each cold cathode fluorescent tube 20 has two pieces so that it may explain in full detail later. It is pulled out of the chassis 12 through a connector 21 provided for each cold cathode fluorescent tube. And in the illuminating device 3, each cold cathode fluorescent tube 20 is connected to the below-mentioned CCFL lighting drive circuit (inverter circuit), and is lighted and driven by PWM dimming, for example.
　ここで、図２及び図３も参照して、本実施形態の照明装置３の要部構成について具体的に説明する。 Here, with reference to FIG. 2 and FIG. 3 as well, the configuration of the main part of the illumination device 3 of the present embodiment will be specifically described.
　図２は上記照明装置の要部構成を説明する図であり、図３は図２に示したＣＣＦＬ駆動回路の構成例を説明する図である。 FIG. 2 is a diagram for explaining a configuration of a main part of the lighting device, and FIG. 3 is a diagram for explaining a configuration example of the CCFL driving circuit shown in FIG.
　図２に示すように、照明装置３には、複数の各冷陰極蛍光管２０の駆動制御を行うための制御部３０と、冷陰極蛍光管２０毎に設けられ、制御部３０からの駆動信号を基に対応する冷陰極蛍光管２０を点灯駆動するＣＣＦＬ駆動回路Ｔとが設置されている。このＣＣＦＬ駆動回路Ｔは、各冷陰極蛍光管２０の長手方向での一端部側に設置されており、対応する冷陰極蛍光管２０に対して、上記一端部側から電流を供給するよう構成されている。また、ＣＣＦＬ駆動回路Ｔには、後述のインバータ回路が用いられており、ＣＣＦＬ駆動回路Ｔは、上記駆動信号を基づき、ＰＷＭ調光を用いて、対応する冷陰極蛍光管２０を駆動可能に構成されている。 As shown in FIG. 2, the illumination device 3 is provided with a control unit 30 for performing drive control of each of the plurality of cold cathode fluorescent tubes 20 and a drive signal from the control unit 30 provided for each cold cathode fluorescent tube 20. And a CCFL driving circuit T for lighting and driving the corresponding cold cathode fluorescent tube 20. The CCFL driving circuit T is installed on one end side in the longitudinal direction of each cold cathode fluorescent tube 20, and is configured to supply current to the corresponding cold cathode fluorescent tube 20 from the one end side. ing. The CCFL drive circuit T uses an inverter circuit described later, and the CCFL drive circuit T is configured to be able to drive the corresponding cold cathode fluorescent tube 20 using PWM dimming based on the drive signal. Has been.
　さらに、照明装置３は、冷陰極蛍光管２０毎に設けられて、対応する冷陰極蛍光管２０を流れたランプ電流値を検出するランプ電流検出回路ＲＣを備えており、照明装置３では、各ランプ電流検出回路ＲＣにて検出されたランプ電流値が各冷陰極蛍光管２０に応じて設置されたフィードバック回路ＦＢ１、ＦＢ２、ＦＢ３、ＦＢ４、ＦＢ５、及びＦＢ６を経て制御部３０に出力されるようになっている。 Furthermore, the illuminating device 3 includes a lamp current detection circuit RC that is provided for each cold cathode fluorescent tube 20 and detects a lamp current value that flows through the corresponding cold cathode fluorescent tube 20. The lamp current value detected by the lamp current detection circuit RC is output to the control unit 30 via the feedback circuits FB1, FB2, FB3, FB4, FB5, and FB6 installed according to each cold cathode fluorescent tube 20. It has become.
　また、制御部３０には、外部からの指示信号として、例えば照明装置３の発光面の輝度を変更する調光指示信号が入力されるようになっており、液晶表示装置１では、ユーザが液晶パネル２の表示面での輝度（明るさ）を適宜変更可能に構成されている。すなわち、制御部３０には、例えば液晶表示装置１側に設けられたリモートコントローラ等の操作入力器（図示せず）から調光指示信号が入力されるように構成されている。そして、制御部３０は、入力された調光指示信号を用いて、ＰＷＭ調光でのデューティ比を決定するとともに、各冷陰極蛍光管２０への供給電流の目標値を定める。 In addition, for example, a dimming instruction signal for changing the luminance of the light emitting surface of the lighting device 3 is input to the control unit 30 as an instruction signal from the outside. The brightness (brightness) on the display surface of the panel 2 can be changed as appropriate. That is, the control unit 30 is configured to receive a dimming instruction signal from an operation input device (not shown) such as a remote controller provided on the liquid crystal display device 1 side, for example. Then, the control unit 30 determines a duty ratio in PWM dimming using the input dimming instruction signal and determines a target value of a supply current to each cold cathode fluorescent tube 20.
　その後、制御部３０は、決定した目標値を基に各ＣＣＦＬ駆動回路Ｔへの駆動信号を生成して出力することにより、対応する冷陰極蛍光管２０に流れるランプ電流値が変化する。この結果、各冷陰極蛍光管２０から出射される出射光の光量が、調光指示信号に応じて変化して、照明装置３の発光面での輝度及び液晶パネル２の表示面での輝度がユーザの操作指示に応じて適切に変更される。 Thereafter, the control unit 30 generates and outputs a drive signal to each CCFL drive circuit T based on the determined target value, whereby the value of the lamp current flowing through the corresponding cold cathode fluorescent tube 20 changes. As a result, the amount of the emitted light emitted from each cold cathode fluorescent tube 20 changes according to the dimming instruction signal, and the luminance on the light emitting surface of the illumination device 3 and the luminance on the display surface of the liquid crystal panel 2 are changed. It is changed appropriately according to the user's operation instruction.
　また、各冷陰極蛍光管２０に実際に供給されたランプ電流値は、対応するランプ電流検出回路ＲＣ及びフィードバック回路ＦＢ１～ＦＢ６を介して、制御部３０に検出電流値としてフィードバックされる。そして、制御部３０では、検出電流値と、上記調光指示信号を基に決定された供給電流の目標値とを用いたフィードバック制御が実行されることにより、ユーザが所望する輝度での表示が維持される。 The lamp current value actually supplied to each cold cathode fluorescent tube 20 is fed back to the control unit 30 as a detected current value via the corresponding lamp current detection circuit RC and feedback circuits FB1 to FB6. Then, the control unit 30 performs feedback control using the detected current value and the target value of the supply current determined based on the dimming instruction signal, so that the display at the brightness desired by the user is performed. Maintained.
　また、図３に例示するように、ＣＣＦＬ駆動回路Ｔには、トランスＴ１と、制御部３０に接続されるとともに、トランスＴ１の一次巻線側の設けられたトランジスタＴ２、Ｔ３と、トランジスタＴ２に接続された電源ＶＣＣを備えたインバータ回路が用いられており、ＣＣＦＬ駆動回路Ｔは、接続された冷陰極蛍光管２０を高周波点灯させるようになっている。すなわち、トランスＴ１の二次巻線には、いずれかの冷陰極蛍光管２０の高電圧側端子が接続されており、トランジスタＴ２、Ｔ３が制御部３０からの駆動信号を基にスイッチング動作を行うことにより、トランスＴ１は、電源ＶＣＣから対応する冷陰極蛍光管２０に電力供給を行い、当該冷陰極蛍光管２０を点灯動作させる。 Further, as illustrated in FIG. 3, the CCFL driving circuit T is connected to the transformer T1 and the control unit 30, and the transistors T2 and T3 provided on the primary winding side of the transformer T1 and the transistor T2 are connected to the transistor T2. An inverter circuit having a connected power supply VCC is used, and the CCFL driving circuit T is adapted to light up the connected cold cathode fluorescent tube 20 at a high frequency. That is, the high-voltage side terminal of any one of the cold cathode fluorescent tubes 20 is connected to the secondary winding of the transformer T1, and the transistors T2 and T3 perform a switching operation based on the drive signal from the control unit 30. Thus, the transformer T1 supplies power from the power supply VCC to the corresponding cold cathode fluorescent tube 20, and turns on the cold cathode fluorescent tube 20.
　また、ＣＣＦＬ駆動回路Ｔでは、例えば各々ＦＥＴを用いて構成されたトランジスタＴ２、Ｔ３と電源ＶＣＣとが制御ＩＣ Ｔ４として一体的に構成されている。そして、ＣＣＦＬ駆動回路Ｔでは、後述のインバータ回路基板上にトランスＴ１及び制御ＩＣ Ｔ４が実装されている。 Further, in the CCFL drive circuit T, for example, transistors T2 and T3 each configured by using an FET and a power supply VCC are integrally configured as a control IC T4. In the CCFL drive circuit T, a transformer T1 and a control IC T4 are mounted on an inverter circuit board described later.
　次に、図４～図６も参照して、本実施形態のコネクタ２１及びインバータ回路基板について具体的に説明する。 Next, the connector 21 and the inverter circuit board of this embodiment will be described in detail with reference to FIGS.
　図４は、図１に示したコネクタの近傍を示す分解斜視図である。図５（ａ）は上記コネクタを示す平面図であり、図５（ｂ）は上記コネクタの内部構成を示す断面図である。図６は、図４に示したインバータ回路基板を示す平面図である。 FIG. 4 is an exploded perspective view showing the vicinity of the connector shown in FIG. FIG. 5A is a plan view showing the connector, and FIG. 5B is a cross-sectional view showing the internal configuration of the connector. FIG. 6 is a plan view showing the inverter circuit board shown in FIG.
　図４に例示するように、本実施形態の照明装置３では、例えば２本の冷陰極蛍光管２０の端部にコネクタ２１が取り付けられており、これらの各冷陰極蛍光管２０はコネクタ２１を介在させてインバータ回路基板２４に実装されたＣＣＦＬ駆動回路Ｔに電気的に接続されている。 As illustrated in FIG. 4, in the illumination device 3 of the present embodiment, for example, connectors 21 are attached to the end portions of two cold cathode fluorescent tubes 20, and each of these cold cathode fluorescent tubes 20 has a connector 21. It is electrically connected to a CCFL drive circuit T mounted on the inverter circuit board 24 with an intervening space.
　具体的にいえば、図５（ａ）及び図５（ｂ）も参照して、コネクタ２１には、冷陰極蛍光管２０毎に設けられるとともに、冷陰極蛍光管２０の端部が挿通される略直方体状の保持部２２と、ＣＣＦＬ駆動回路Ｔ側に接続される直方体状の接続部２３とが設けられている。これら保持部２２と接続部２３とは、例えば射出成形法によって一体的に形成されている。 Specifically, referring also to FIGS. 5A and 5B, the connector 21 is provided for each cold cathode fluorescent tube 20 and the end of the cold cathode fluorescent tube 20 is inserted. A substantially rectangular parallelepiped holding portion 22 and a rectangular parallelepiped connection portion 23 connected to the CCFL drive circuit T side are provided. The holding portion 22 and the connecting portion 23 are integrally formed by, for example, an injection molding method.
　また、保持部２２には、図５に示すように、例えば合成樹脂を用いて構成されるとともに、冷陰極蛍光管２０の端部が挿通されて保持する保持部本体２２ａと、冷陰極蛍光管２０の端部に設けられた電極部２０ａと電気的に接続される端子部２２ｂが設けられている。 Further, as shown in FIG. 5, the holding portion 22 is made of, for example, a synthetic resin, and has a holding portion main body 22a through which the end of the cold cathode fluorescent tube 20 is inserted, and a cold cathode fluorescent tube. The terminal part 22b electrically connected with the electrode part 20a provided in the edge part of 20 is provided.
　また、接続部２３には、例えば合成樹脂を用いて構成されるとともに、シャーシ１２に形成された矩形状の取付孔１２ａ（図４）に挿通される接続部本体２３ａと、接続部本体２３ａの内部に形成されるとともに、２つの端子部２２ｂにそれぞれ電気的に接続されている２つの接続部材２３ｂが設けられている。 In addition, the connection portion 23 is configured using, for example, a synthetic resin, and a connection portion main body 23a inserted into a rectangular attachment hole 12a (FIG. 4) formed in the chassis 12, and a connection portion main body 23a. Two connection members 23b that are formed inside and are electrically connected to the two terminal portions 22b are provided.
　また、図６に示すように、インバータ回路基板２４には、シャーシ１２に対向して配置される表面上に、コネクタ２１と係合するコネクタ部材２４ａが設置されている。つまり、コネクタ部材２４ａには、矩形状の開口部が設けられており、この開口部がシャーシ１２の取付孔１２ａに対向するように、インバータ回路基板２４はシャーシ１２に取り付けられる。また、コネクタ部材２４ａには、２つの電極端子部２４ａ１が設けられており、これら２つの電極端子部２４ａ１はコネクタ２１の接続部２３に設けられた２つの接続部材２３ｂとそれぞれ電気的に接続されるようになっている。 Further, as shown in FIG. 6, the inverter circuit board 24 is provided with a connector member 24 a that engages with the connector 21 on the surface arranged to face the chassis 12. That is, the connector member 24 a is provided with a rectangular opening, and the inverter circuit board 24 is attached to the chassis 12 so that the opening faces the attachment hole 12 a of the chassis 12. The connector member 24 a is provided with two electrode terminal portions 24 a 1, and these two electrode terminal portions 24 a 1 are electrically connected to two connection members 23 b provided at the connection portion 23 of the connector 21, respectively. It has become so.
　つまり、各電極端子部２３ａ１には、接続部材２３ｂが差し込まれる差込孔２４ａ２が形成されており、コネクタ２１とコネクタ部材２４ａとが係合したときに、接続部材２３ｂが差込孔２４ａ２に差し込まれて電極端子部２３ａ１と電気的に接続される。また、インバータ回路基板２４では、シャーシ１２と対向する表面と反対側の表面（図６の裏面）側にＣＣＦＬ駆動回路Ｔに含まれたトランスＴ１や制御ＩＣ Ｔ４が実装されており、各電極端子部２３ａ１がトランスＴ１に電気的に接続されている。 That is, each electrode terminal portion 23a1 has an insertion hole 24a2 into which the connection member 23b is inserted, and when the connector 21 and the connector member 24a are engaged, the connection member 23b is inserted into the insertion hole 24a2. And electrically connected to the electrode terminal portion 23a1. Further, in the inverter circuit board 24, the transformer T1 and the control IC T4 included in the CCFL driving circuit T are mounted on the surface opposite to the surface facing the chassis 12 (the back surface in FIG. 6), and each electrode terminal The part 23a1 is electrically connected to the transformer T1.
　そして、本実施形態の照明装置３では、２本の冷陰極蛍光管２０の左右の各端部にコネクタ２１が取り付けられた状態で、これら左右の各コネクタ２１をコネクタ部材２４ａに係合させることにより、当該２本の冷陰極蛍光管２０の組付作業が完了するようになっている。これにより、本実施形態の照明装置３では、冷陰極蛍光管２０の設置数が増加させたときでも、冷陰極蛍光管２０の組付作業を簡単に、かつ、迅速に行わせることができる。 And in the illuminating device 3 of this embodiment, with the connectors 21 attached to the left and right ends of the two cold cathode fluorescent tubes 20, the left and right connectors 21 are engaged with the connector member 24a. Thus, the assembly work of the two cold cathode fluorescent tubes 20 is completed. Thereby, in the illuminating device 3 of this embodiment, even when the installation number of the cold cathode fluorescent tubes 20 is increased, the assembling work of the cold cathode fluorescent tubes 20 can be performed easily and quickly.
　尚、インバータ回路基板２４には、図６に例示するように、ビス孔２４ｂが２箇所に設けられており、これらのビス孔２４ｂに挿通されたビス２９により、インバータ回路基板２４はシャーシ１２に固定されるようになっている。 As illustrated in FIG. 6, the inverter circuit board 24 is provided with two screw holes 24 b, and the inverter circuit board 24 is connected to the chassis 12 by the screws 29 inserted into these screw holes 24 b. It is supposed to be fixed.
　以上のように構成された本実施形態の照明装置３は、冷陰極蛍光管（放電管）２０の電極部２０ａと電気的に接続する端子部２２ｂを有し、２本の冷陰極蛍光管の各端部を保持する保持部２２と、ＣＣＦＬ駆動回路（インバータ回路）Ｔ側に接続される接続部２３とが一体的に設けられたコネクタ２１が設置されている。また、本実施形態の照明装置３では、コネクタ２１を使用して、複数の各冷陰極蛍光管２０とＣＣＦＬ駆動回路Ｔとを電気的に接続している。これにより、上記従来例と異なり、冷陰極蛍光管２０の設置数を増加させたときでも、冷陰極蛍光管２０とＣＣＦＬ駆動回路Ｔとの接続作業を簡単に行うことができる。 The illuminating device 3 of the present embodiment configured as described above has a terminal portion 22b that is electrically connected to the electrode portion 20a of the cold cathode fluorescent tube (discharge tube) 20, and includes two cold cathode fluorescent tubes. A connector 21 is provided in which a holding portion 22 that holds each end portion and a connection portion 23 that is connected to the CCFL drive circuit (inverter circuit) T side are integrally provided. In the illumination device 3 of the present embodiment, the plurality of cold cathode fluorescent tubes 20 and the CCFL drive circuit T are electrically connected using the connector 21. Thereby, unlike the conventional example, even when the number of the cold cathode fluorescent tubes 20 is increased, the connection operation between the cold cathode fluorescent tubes 20 and the CCFL driving circuit T can be easily performed.
　また、本実施形態の照明装置３では、コネクタ２１の接続部２３に、インバータ回路基板２４に設けられた電極端子部２４ａ１に電気的に接続される接続部材２３ｂが設けられているので、ケーブルなどの配線を使用することなく、複数の各冷陰極蛍光管２０とＣＣＦＬ駆動回路Ｔとを電気的に接続することができ、これら接続作業をより簡単に行うことができる。 Moreover, in the illuminating device 3 of this embodiment, since the connection part 23b electrically connected to the electrode terminal part 24a1 provided in the inverter circuit board 24 is provided in the connection part 23 of the connector 21, a cable etc. The plurality of cold-cathode fluorescent tubes 20 and the CCFL driving circuit T can be electrically connected without using the above wiring, and these connection operations can be performed more easily.
　また、本実施形態では、冷陰極蛍光管２０の設置数を増加させたときでも、冷陰極蛍光管２０とＣＣＦＬ駆動回路Ｔとの接続作業を簡単に行うことができる照明装置３が用いられているので、組立作業性に優れた高性能な液晶表示装置１を容易に構成することができる。 Further, in the present embodiment, the illumination device 3 is used that can easily connect the cold cathode fluorescent tube 20 and the CCFL driving circuit T even when the number of the cold cathode fluorescent tubes 20 is increased. Therefore, the high-performance liquid crystal display device 1 excellent in assembly workability can be easily configured.
　尚、上記の実施形態はすべて例示であって制限的なものではない。本発明の技術的範囲は特許請求の範囲によって規定され、そこに記載された構成と均等の範囲内のすべての変更も本発明の技術的範囲に含まれる。 It should be noted that all of the above embodiments are illustrative and not restrictive. The technical scope of the present invention is defined by the claims, and all modifications within the scope equivalent to the configurations described therein are also included in the technical scope of the present invention.
　例えば、上記の説明では、本発明を透過型の液晶表示装置に適用した場合について説明したが、本発明の照明装置はこれに限定されるものではなく、光源の光を利用して、画像、文字などの情報を表示する非発光型の表示部を備えた各種表示装置に適用することができる。具体的には、半透過型の液晶表示装置、あるいは液晶パネルをライトバルブに用いた投写型表示装置に本発明の照明装置を好適に用いることができる。 For example, in the above description, the case where the present invention is applied to a transmissive liquid crystal display device has been described. However, the lighting device of the present invention is not limited to this, and the image, The present invention can be applied to various display devices including a non-light emitting display unit that displays information such as characters. Specifically, the illumination device of the present invention can be suitably used for a transflective liquid crystal display device or a projection display device using a liquid crystal panel as a light valve.
　また、上記の説明以外に、本発明は、レントゲン写真に光を照射するシャウカステンあるいは写真ネガ等に光を照射して視認をし易くするためのライトボックスや、看板や駅構内の壁面などに設置される広告等をライトアップする発光装置の照明装置として好適に用いることができる。 In addition to the above explanation, the present invention is installed on a light box for illuminating X-ray film or photographic negatives for irradiating light to make it easy to see, or on a signboard or a wall in a station. It can be suitably used as a lighting device for a light emitting device that illuminates advertisements and the like.
　また、上記の説明では、冷陰極蛍光管を用いた場合について説明したが、本発明の放電管はこれに限定されるものではなく、熱陰極蛍光管やキセノン蛍光管などの他の放電蛍光管、あるいはＵ字管や擬似Ｕ字管などの非直管状の放電蛍光管を使用することもできる。 In the above description, the case where a cold cathode fluorescent tube is used has been described. However, the discharge tube of the present invention is not limited to this, and other discharge fluorescent tubes such as a hot cathode fluorescent tube and a xenon fluorescent tube are used. Alternatively, a non-straight tubular discharge fluorescent tube such as a U-shaped tube or a pseudo-U-shaped tube may be used.
　なお、上記キセノン蛍光管などの水銀レスの放電蛍光管を用いた場合には、重力の作用方向に平行に配列された放電管を有する長寿命な照明装置を構成することができる。 In addition, when a mercury-less discharge fluorescent tube such as the xenon fluorescent tube is used, a long-life lighting device having discharge tubes arranged in parallel to the direction of gravity can be configured.
　また、上記の説明では、冷陰極蛍光管の一端部側にインバータ回路を設けて、当該冷陰極蛍光管に対して一端部側から電力供給を行う、いわゆる片側駆動を実施する場合について説明したが、本発明はこれに限定されるものではなく、他端部側にもインバータ回路を設け、冷陰極蛍光管を両側駆動する構成にも本発明を適用することができる。 In the above description, an inverter circuit is provided on one end of the cold cathode fluorescent tube, and power is supplied from the one end to the cold cathode fluorescent tube. The present invention is not limited to this, and the present invention can also be applied to a configuration in which an inverter circuit is provided on the other end side and the cold cathode fluorescent tube is driven on both sides.
　また、上記の説明では、２本の冷陰極蛍光管毎にコネクタを設けた場合について説明したが、本発明のコネクタはこれに限定されるものではなく、３本以上の複数の放電管にも適用することができる。すなわち、放電管の本数に応じて、複数の上記保持部を設けるとともに、複数の保持部と接続部とを一体的に構成すればよい。 In the above description, the case where a connector is provided for each of two cold cathode fluorescent tubes has been described. However, the connector of the present invention is not limited to this, and the present invention is also applicable to a plurality of three or more discharge tubes. Can be applied. That is, according to the number of discharge tubes, a plurality of the holding portions may be provided, and the plurality of holding portions and the connecting portion may be configured integrally.
　本発明は、放電管の設置数を増加させたときでも、放電管とインバータ回路との接続作業を簡単に行うことができる照明装置、及びこれを用いた表示装置に対して有用である。 The present invention is useful for an illumination device that can easily connect the discharge tube and the inverter circuit, and a display device using the same even when the number of discharge tubes is increased.

Claims (3)

  1. 複数の放電管と、前記放電管を点灯駆動するインバータ回路を備えた照明装置であって、
    　前記複数の放電管の各端部に設けられた電極部と電気的に接続する端子部を有し、前記複数の放電管の各端部を保持する保持部と、前記インバータ回路側に接続される接続部とが一体的に設けられたコネクタを備え、
    　前記コネクタを使用して、前記複数の各放電管と前記インバータ回路とを電気的に接続した、
    　ことを特徴とする照明装置。     A lighting device including a plurality of discharge tubes and an inverter circuit for driving and driving the discharge tubes,
    A terminal portion electrically connected to an electrode portion provided at each end portion of the plurality of discharge tubes; a holding portion holding each end portion of the plurality of discharge tubes; and the inverter circuit side. And a connector provided integrally with the connecting portion,
    Using the connector, the plurality of discharge tubes and the inverter circuit were electrically connected,
    A lighting device characterized by that.
  2. 前記インバータ回路が実装されたインバータ回路基板を備えるとともに、
    　前記接続部には、前記インバータ回路基板に設けられた電極端子部に電気的に接続される接続部材が設けられている請求項１に記載の照明装置。     With an inverter circuit board on which the inverter circuit is mounted,
    The lighting device according to claim 1, wherein the connection portion is provided with a connection member that is electrically connected to an electrode terminal portion provided on the inverter circuit board.
  3. 請求項１または２に記載の照明装置を用いたことを特徴とする表示装置。 A display device using the illumination device according to claim 1.
PCT/JP2009/054265 2008-05-30 2009-03-06 Illuminating device and display device WO2009144986A1 (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007080627A (en) * 2005-09-13 2007-03-29 Nippon Leiz Co Ltd Illumination device
WO2008001567A1 (en) * 2006-06-30 2008-01-03 Sharp Kabushiki Kaisha Power supply board, board connector, luminaire, display, and television receiver

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007080627A (en) * 2005-09-13 2007-03-29 Nippon Leiz Co Ltd Illumination device
WO2008001567A1 (en) * 2006-06-30 2008-01-03 Sharp Kabushiki Kaisha Power supply board, board connector, luminaire, display, and television receiver

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