CN1912693A - Bundled wire, illuminating device, backlight device and liquid crystal display device - Google Patents
Bundled wire, illuminating device, backlight device and liquid crystal display device Download PDFInfo
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- CN1912693A CN1912693A CN 200610109353 CN200610109353A CN1912693A CN 1912693 A CN1912693 A CN 1912693A CN 200610109353 CN200610109353 CN 200610109353 CN 200610109353 A CN200610109353 A CN 200610109353A CN 1912693 A CN1912693 A CN 1912693A
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Abstract
A wire harness, a lighting device, a backlight device and a liquid crystal display device. The wire harness includes a conductive member configured to connect electric members to each other for electric conduction; a covering member configured to enclose and cover the conductive member, the covering member being formed of a first insulating material; and a retaining member configured to enclose the covering member so as to define a space between the covering member and the retaining member, the retaining member being formed of a second insulating material.
Description
The cross reference of related application
The present invention comprises Japanese patent application JP2006-167318 that submits to Jap.P. office with on June 16th, 2006 and the relevant theme of submitting to Jap.P. office on August 10th, 2005 of Japanese patent application JP2005-231556, incorporates its full content here by reference into.
Technical field
The present invention relates in various device, to be used to the interconnect bunch (wire harness) of the electric components arranged at a certain distance each other such as electric installation, motor vehicles etc., and be suitable for the light-emitting device, back lighting device and the liquid crystal indicator that utilize bunch that alternating electromotive force is provided.
Background technology
In the past, bunch is in being commonly used in light-emitting device, back lighting device and the liquid crystal indicator and the various device such as motor vehicles etc. as electric installation.Electric installation, electric parts or electric module (hereinafter being referred to as electric components) that bunch is used for interconnecting and arranges with state physically separated from one another, thus between these electric components switching telecommunication number or electric power.That is, bunch comprise one group one or more have the line of predetermined length, curved shape etc.Bunch has shortened and is used for the electric components time connected to one another has been prevented wrong wiring during the manufacturing of above-mentioned various devices, and makes routing path arrange homogenising to improve the quality of products.
Particularly, in the electric installation field, there is liquid crystal indicator to spread to the trend of general family fast recently.This non-self-emission display apparatus uses back lighting device, and back lighting device is by utilizing cold cathode fluorescent tube as light source back light unit (luminescence unit) is provided and forming with the driving and the control module that are used for the driven for emitting lights unit by insulate line (covered wire) the interconnection luminescence unit of being made by conductive material.In addition, because the luminescence efficiency of cold cathode fluorescent tube is good, entered practicality with the driven cold cathode fluorescent tube of the frequency higher, as the light-emitting device that is used to throw light on than the frequency of source power supply.
In many cases, this light-emitting device that has the back lighting device of luminescence unit and driving and control module and be used to throw light on utilizes the alternating electromotive force of tens kHz to light cold cathode fluorescent tube.Active research the technology below for example: provide the technology of electric power (to see Japanese Patent Laid Open Publication No.2002-303848 from a cold-cathode fluorescent tube drive device to a plurality of cold cathode fluorescent tubes by the conductive material line, hereinafter be called patent documentation 1) and be used for the technology (see Japanese Patent Laid Open Publication No.2001-255527, hereinafter be called patent documentation 2) of the insulating material minimizing of casing from the leakage current of insulate line.
In field of motor vehicles, use the electric vehicle of synchronous motor just causing people's attention.Equally in this field, may need to be used to connect the insulate line of synchronous motor and control module, the electric current of insulate line of flowing through is an alternating current, and as at the above-mentioned light-emitting device that is used for throwing light on and the back lighting device of liquid crystal indicator, leakage current has taken place.
Summary of the invention
Hope uses bunch to improve the volume production rate in the back lighting device of above-mentioned liquid crystal indicator.On the other hand, in recent years, it is increasing that the screen of liquid crystal indicator has become, back lighting device also thereby become bigger, and the power that is used to drive cold cathode fluorescent tube also increases.In addition, following pattern is used more and more widely: one of them inverter circuit (driving and control module) order drives a plurality of cold cathode fluorescent tubes or drives a plurality of cold cathode fluorescent tubes simultaneously, as disclosed in the patent documentation 1.As a result, compared by the situation that an inverter circuit drives with a cold cathode fluorescent tube, it is longer that bunch becomes.At the light-emitting device that is used for throwing light on, cold cathode fluorescent tube and driving power unit certain distance separated from one another is to improve design freedom.In field of motor vehicles, driving power unit and increasing with the distance between the synchronous motor of alternating electromotive force operation is because used so-called in-wheel motor (in-wheel motor).In arbitrary situation, be used for driving power unit and load circuit bunch connected to one another are trended towards becoming longer.
In this case, being used in bunch in electric installation, the motor vehicles etc. (this bunch is only made by the bundle that forms insulate line along routing path) has in the past increased the absolute magnitude of the leakage current that flows to conductive material casing (for example iron or aluminium cabinet), thereby makes self-driven and electric power control module can't efficiently arrive load circuit such as cold cathode fluorescent tube etc.This has for example caused and has driven in the reduction of luminescence efficiency or the back lighting device and the increase of control module size, and has further caused the increase of unnecessary device power consumption.Use and to reduce leakage current, but need overcome such as case strength and the problem of tackling aspects such as undesirable electromagnetic radiation as the disclosed insulating material that is used for casing in the patent documentation 2.In addition, along with the increase of power and the lifting of alternating electromotive force frequency, light-emitting device that is used to throw light on and electric vehicle have similar problem and will solve.
Consider the problems referred to above, be desirable to provide a kind of bunch that causes a spot of alternating electromotive force leakage and be suitable for providing alternating electromotive force, and utilize this bunch that light-emitting device, back lighting device and the liquid crystal indicator of alternating electromotive force are provided.
According to one embodiment of present invention, provide a kind of bunch, having comprised: be configured to electric components is connected with each other with the conductive member that conducts; Be configured to the covering member that surrounds and cover conductive member, this covering member is made by first insulating material; And being configured to the retaining member that surrounds covering member under the situation in space leaving, this retaining member is made by second insulating material.
In this bunch, conductive member is connected with each other electric components to conduct.The covering member of being made by first insulating material surrounds and covers conductive member.Retaining member surrounds covering member leaving under the situation in space.
According to one embodiment of present invention, provide a kind of light-emitting device, having comprised: being configured to provides the driving power of alternating electromotive force unit; Have the cold cathode fluorescent tube that is provided to alternating electromotive force and be used to keep the luminescence unit of the casing of cold cathode fluorescent tube; And the conductive member that is insulated the material covering, this conductive member is connected with each other driving power unit and cold cathode fluorescent tube conducting, and this conductive member is surrounded under the situation in space and places along casing leaving by the retaining member of being made by insulating material; Wherein retaining member has suppressed the leakage of alternating electromotive force.
In this light-emitting device, driving power unit and luminescence unit are connected with each other by conductive member, thereby make that from the alternating electromotive force of driving power unit the cold cathode fluorescent tube of luminescence unit is luminous.Conductive member is surrounded leaving under the situation in space by the retaining member of being made by insulating material, thereby has suppressed the leakage of alternating electromotive force.
According to one embodiment of present invention, provide a kind of and be used for from the back lighting device of the back side illuminated of picture display face, this back lighting device comprises: being configured to provides the driving power of alternating electromotive force unit; Have the cold cathode fluorescent tube that is provided to alternating electromotive force and be used to keep the luminescence unit of the casing of cold cathode fluorescent tube; And the conductive member that is insulated the material covering, this conductive member is connected with each other driving power unit and cold cathode fluorescent tube conducting, and this conductive member is surrounded under the situation in space and places along casing leaving by the retaining member of being made by insulating material; Wherein retaining member has suppressed the leakage of alternating electromotive force.
This back lighting device is from the back side illuminated of picture display face, and serves as back lighting device.Driving power unit and luminescence unit are connected with each other by conductive member, thereby make that from the alternating electromotive force of driving power unit the cold cathode fluorescent tube of luminescence unit is luminous.Conductive member is surrounded leaving under the situation in space by the retaining member of being made by insulating material, thereby has suppressed the leakage of alternating electromotive force.
According to one embodiment of present invention, provide a kind of liquid crystal indicator, having comprised: liquid crystal panel; Be configured to according to vision signal and generate drive signal and drive the panel driving unit of liquid crystal panel; Has the luminescence unit that is used for from the cold cathode fluorescent tube of the back side illuminated of the picture display face of liquid crystal panel; And be configured to the driving power unit that alternating electromotive force is provided to luminescence unit; Wherein, a kind of bunch that comprises conductive member, covering member and retaining member is provided, wherein covering member is configured to and surrounds and cover conductive member, and covering member is formed by first insulating material, retaining member is positioned so as to be under the situation that leaves the space and surrounds covering member, and retaining member is formed by second insulating material, and driving power unit and luminescence unit are connected with each other by the conductive member that forms bunch.
This liquid crystal indicator comprises panel driving unit, luminescence unit and driving power unit.Driving power unit and luminescence unit are connected with each other by bunch, this bunch comprises conductive member, covering member and retaining member, this covering member is configured to and surrounds and cover conductive member, and covering member is formed by first insulating material, this retaining member is configured to leaving under the situation in space and surrounds covering member, and retaining member is formed by second insulating material.Thereby suppressed the leakage of alternating electromotive force.
According to the present invention, a kind of bunch that causes that a spot of alternating electromotive force leaks can be provided, and utilize this bunch that light-emitting device, back lighting device and the liquid crystal indicator of alternating electromotive force are provided.
Description of drawings
Figure 1A and Figure 1B are the external views according to the liquid crystal indicator of an embodiment;
Fig. 2 is the block diagram according to the liquid crystal indicator of embodiment;
Fig. 3 shows according to the driving of the liquid crystal indicator of embodiment and control module;
Fig. 4 shows according to the driving of embodiment and the examples of circuits of control circuit;
Fig. 5 A to Fig. 5 C shows the bunch according to embodiment;
Fig. 6 shows according to embodiment at the diagrammatic sketch that is connected that uses bunch between driving and control module and the luminescence unit;
Fig. 7 shows in the comparative examples diagrammatic sketch that is connected that uses bunch between driving and control module and luminescence unit;
Fig. 8 A to Fig. 8 C shows the bunch according to embodiment;
Fig. 9 shows according to embodiment at the diagrammatic sketch that is connected that uses bunch between driving and control module and the luminescence unit;
Figure 10 shows according to embodiment at the diagrammatic sketch that is connected that uses bunch between driving and control module and the luminescence unit;
Figure 11 shows according to embodiment at the diagrammatic sketch that is connected that uses bunch between driving and control module and the luminescence unit;
Figure 12 shows according to embodiment at the diagrammatic sketch that is connected that uses bunch between driving and control module and the luminescence unit;
Figure 13 shows according to embodiment at the diagrammatic sketch that is connected that uses bunch between driving and control module and the luminescence unit;
Figure 14 shows according to embodiment at the diagrammatic sketch that is connected that uses bunch between driving and control module and the luminescence unit;
Figure 15 shows the diagrammatic sketch that uses the back lighting device of bunch according to embodiment;
Figure 16 shows at the diagrammatic sketch according to the arrangement of the component part in the liquid crystal indicator of embodiment; And
Figure 17 shows the diagrammatic sketch according to the light-emitting device of embodiment.
Embodiment
Preferred embodiment is described below with reference to the accompanying drawings.With reference to Figure 1A and Figure 1B and Fig. 2, at first common liquid crystal indicator is described.With reference to figure 3, the back lighting device that critical piece by driving and control module and cold cathode fluorescent tube is formed describes, drive and control module is used in the liquid crystal indicator and in an embodiment as an example of driving power unit, cold cathode fluorescent tube is used as an example of load circuit in an embodiment.The driving of driving and control module and another embodiment of control circuit have been shown among Fig. 4, will be described with reference to figure 4.With reference to figure 5A to Fig. 5 C, will the structure and the effect of bunch be described.Then, with reference to figure 6, will be to describing being connected of bunch using between driving and control module and the luminescence unit according to embodiment.With reference to figure 7, will be to describing being connected of line using between driving and control module and the luminescence unit according to comparative examples.Fig. 8 A to Fig. 8 C shows the bunch according to other embodiment.With reference to figure 9 to Figure 14, will be between driving and control module and luminescence unit, using the connection mode of bunch to describe, and will describe to back lighting device according to various embodiment.With reference to Figure 15 and Figure 16, will be between driving and control module and luminescence unit, using the connection mode of bunch to describe according to various embodiment, and will describe back lighting device and liquid crystal indicator.In addition, with reference to Figure 17, will describe using bunch and being exclusively used in luminous light-emitting device.
(explanation of liquid crystal indicator)
At first, with reference to the external view of Figure 1A and Figure 1B and the block diagram of Fig. 2, will the liquid crystal indicator according to an embodiment be described.The stereographic map of Figure 1A is when tilting to watch the liquid crystal panel display surface 61 of front surface one side (video-see face one side) as liquid crystal panel 22 (see figure 2)s from the below, the external view of liquid crystal indicator.When the stereographic map of Figure 1B is back of the body surface one side (not being that side of video-see face one side) watch when tilting from the top as the surface of the opposite side of liquid crystal panel display surface 61, the external view of liquid crystal indicator.
Liquid crystal panel display surface 61 and cabinet 63 are fixed to casing 62, and are kept by casing 62, and casing 62 is arranged feasible four sides, i.e. upside, downside, left side and the right side of surrounding.On cabinet 63, the main circuit (will be described later) that comprises balancing coil unit 64a and balance coil unit 64b that is positioned on the liquid crystal indicator both side ends is fixing by the spring member 65a to 65d shown in Figure 1B etc. via the plastics holder respectively.Cabinet 63 is made by the iron or the aluminium of conduction.
A plurality of cold cathode fluorescent tubes, for example 22 cold cathode fluorescent tubes (not illustrating in the drawings) are arranged between the back side one side and cabinet 63 of liquid crystal panel display surface 61.Cold cathode fluorescent tube has long narrow cylindrical shape.Cold cathode fluorescent tube is arranged parallel to each other along the longitudinal direction (horizontal direction of the paper of Fig. 1) of liquid crystal panel display surface 61, thereby parallel with the longitudinal direction of casing 62.Each cold cathode fluorescent tube all has electrode in two end.Being arranged in a plurality of cold cathode fluorescent tubes respective electrode on each the two ends is provided to from each electric power among balancing coil unit 64a and the balance coil unit 64b.Thereby balancing coil unit 64a and balance coil unit 64b are arranged near the electrode of each cold cathode fluorescent tube, so that make the electric current homogeneous that flows in cold cathode fluorescent tube.Balancing coil unit 64a and balance coil unit 64b utilize the bunch that has extended long distance from the driving power unit to be provided to electric power.For the liquid crystal indicator that thickness reduces, bunch is arranged near the cabinet of being made by iron or aluminium 63.This will describe in detail in conjunction with Figure 15 and Figure 16 in the back.
Fig. 2 shows the block diagram of liquid crystal indicator 20.The video terminal tv input of vision signal from liquid crystal indicator 20.Vision signal is provided for panel driving unit 21.The 21 pairs of incoming video signals in panel driving unit are carried out necessary vision signal and are handled, thereby generate the drive signal that drives liquid crystal panel 22, so that based on the incoming video signal display image.Liquid crystal panel 22 is according to the drive signal executable operations that generates like this in panel driving unit 21, with according to the vision signal display image.Yet these image naked eyes are sightless.
As the driving that drives cold cathode fluorescent tube and the schematic diagram of control module 5, Fig. 3 shows and drives and control module 5, and it has the driving that is used to drive a cold cathode fluorescent tube 10 and control circuit 15 as critical piece.Driving and control circuit 15 comprise vibration and driving circuit 6, transistor Q1 and transistor Q2.The base stage of vibration and driving circuit 6 driving transistors Q1 and transistor Q2.The collector of transistor Q1 is connected to DC voltage positive electrode side Vin+, and DC voltage is provided to from this positive electrode side and drives and control module 5.The emitter of transistor Q1 is connected to the collector of transistor Q2.The emitter of transistor Q2 is connected to DC voltage negative electrode side Vin-.In order to reduce the loss among transistor Q1 and the transistor Q2, transistor Q1 and transistor Q2 are controlled as and alternately repeat two states, that is, and and conducting state and cut-off state.When transistor Q1 conducting, transistor Q2 ends.When transistor Q1 ends, transistor Q2 conducting.Square-wave voltage takes place in the node place at the collector of the emitter of transistor Q1 and transistor Q2.
Square-wave voltage is applied to the electrode Dm1 and the electrode Dm2 of cold cathode fluorescent tube 10 via capacitor C1.Capacitor C1 is used for the corresponding voltage of midpoint potential that is kept with capacitor C1 the current potential amplitude of electrode Dm1 and electrode Dm2 being changed into identical positive level and negative level.
Although can utilize this square-wave voltage to drive cold cathode fluorescent tube fully, the current transformation that present embodiment utilizes resonant circuit will be provided for cold cathode fluorescent tube is sine wave, to reduce undesirable radiation.Fig. 4 shows driving and the control module 105 that uses resonant circuit.Can use the resonant circuit that is formed by transformer TR and capacitor C1 shown in Fig. 6, this will be described later.
To the driving and the control module 105 of the use resonant circuit shown in Fig. 4 be described below.Driving and control module 105 form by the back level that the parallel resonance transducer is connected active filter.Driving and control module 105 have so-called wide region ability, and it can handle the AC-input voltage of AC100V system and AC 200V system.The interpolation of active filter is used to improve power factor.The parallel resonance converter using configuration of external drive half-bridge coupled system.
Drive and control module 105 in, be connected to commercial ac power source AC by connecting the common-mode noise filter that two common mode choke CMC and three cross-over connection capacitor CL form, connection mode as shown in Figure 4.Bridge rectifier circuit Di is connected the back level of common-mode noise filter.The rectification output line of bridge rectifier circuit Di links to each other with normal mode noise wave filter 125, and normal mode noise wave filter 125 forms by a choking coil LN is linked to each other with two filter capacitor CN, as shown in the figure.The positive output terminal of normal mode noise wave filter 125 is connected in series via inductor LPC and fast quick-recovery type commutation diode D20's, is connected to the positive electrode terminal of smmothing capacitor Ci.The RC buffer circuit and the commutation diode D20 that are formed by capacitor Csn and resistance R sn are connected in parallel.
MOS-FET with body diode D103 is chosen as on-off element Q3.On-off element Q3, inductor LPC, commutation diode D20 and smmothing capacitor Ci have formed boost switching regulator, and have formed the major part of the active filter that is used to improve power factor.Power factor and output voltage controlling circuit 120 be used to control active filter operation to carry out power-factor improvement so that make power factor near 1 integrated circuit (IC).Power factor and output voltage controlling circuit 120 for example comprise multiplier, divider, error voltage amplifier, pwm control circuit and are used to export the driving circuit that is used for on-off element is carried out the drive signal of switch drive.
Be imported into the terminal T1 of power factor and output voltage controlling circuit 120 by the magnitude of voltage that utilizes divider resistance R5 and R6 that voltage (through rectification and the level and smooth voltage Ei) dividing potential drop at smmothing capacitor Ci two ends is obtained.And the corresponding signal of electric current of the bridge rectifier circuit Di that flows through is input to terminal T2 via resistance R 4 from the source electrode that is inserted in on-off element Q3 and the node of the resistance R 3 between the primary side ground.In addition, the pulsating current voltage that obtains from full-wave rectification (this voltage obtains at the output terminal of bridge rectifier circuit Di) by resistance R 7 and resistance R 8 dividing potential drops, is imported into terminal T4 subsequently.Power factor and output voltage controlling circuit 120 are carried out control, so that will maintain predetermined value to the magnitude of voltage that the voltage dividing potential drop at smmothing capacitor Ci two ends obtains by utilizing divider resistance R5 and R6, thereby make voltage constant, and will be by utilizing electric voltage equalization that resistance R 7 and 8 pairs of pulsating current voltage of resistance R dividing potential drop obtain, thereby make power factor near 1 for to be input to the voltage of terminal T2 via resistance R 4.In addition, be used in driving and the control module 105 providing the power supply unit of electric power to provide the power supply unit of electric power not shown in Figure 4 to vibration and driving circuit (will be described later) with being used for to power factor and output voltage controlling circuit 120.
Behind above-mentioned active filter in the parallel resonance transducer of level, it is continuous that the on-off element Q101 that is formed by two MOS-FET and on-off element Q102 are connected by half-bridge, and be connected in parallel with smmothing capacitor Ci, as shown in Figure 4.That is, formed the parallel resonance transducer of half-bridge coupled mode.Parallel resonance transducer in this case is external drive.When on-off element Q101 and on-off element Q102 turn-off, body diode D101 and each self-forming of body diode D102 be used for path by inverse current.Vibration and driving circuit 102 be with the switching frequency of necessity, by the timing of alternate conduction/shutoff, on-off element Q101 and on-off element Q102 carried out switch drive with on-off element Q101 and on-off element Q102.
The switch output that converter transformer PIT is provided to obtain by on-off element Q101 and on-off element Q102 is transferred to primary side from primary side.The end of the elementary winding N1 of converter transformer PIT is connected to the node of on-off element Q101 and on-off element Q102 via series resonance capacitor C101.Another end of the elementary winding N1 of converter transformer PIT is connected to primary side ground.The leakage inductance that the electric capacity of series resonance capacitor C101 and elementary winding N1 two ends occur has formed series resonant circuit.Series resonant circuit is carried out resonant operation by being provided to switch output.Capacitor Cp1 forms the part voltage resonant circuit, to reduce the loss among on-off element Q101 and the on-off element Q102.
Secondary winding N2 is wrapped on the primary side of converter transformer PIT.Obtained voltage with the corresponding sinusoidal wave form of resonant operation from secondary winding N2.Suitably select the turn ratio between elementary winding N1 and the secondary winding N2 that the electrode Dm1 of cold cathode fluorescent tube 10 and the voltage of the expectation between the Dm2 are provided.Capacitor C1 will cut off the DC component.Yet owing to there is not DC voltage to be transferred to secondary winding N2, so secondary winding N2 can be directly connected to electrode Dm1 and Dm2, and need not to provide capacitor C1.
(explanation of bunch)
Fig. 5 A to Fig. 5 C shows the bunch according to present embodiment.Fig. 5 A to Fig. 5 C is the figure from its termination side bunch.Bunch 1 shown in Fig. 5 A comprises a conductive member 1c.This bunch 1 comprises conductive member 1c, be used to surround and cover the covering member 1b of conductive member 1c (covering member 1b is made by insulating material) and be used for the retaining member 1a (retaining member 1a is made by insulating material) that surrounds covering member 1b under the situation in space leaving.The overall diameter of retaining member 1a is by distance D 1 expression, and the thickness of the insulating material of retaining member 1a is by distance D 2 expressions, and the diameter of covering member 1b is by distance D 3 expressions.
Bunch 3 shown in Fig. 5 C is by adding that shielding 3d forms for the bunch 2 shown in Fig. 5 B.Shielding 3d utilizes around the grid configuration of retaining member 2a and retaining member 3a or the conductive material of plane form to form.Shielding 3d can form around being wrapped in bunch 2 with grid configuration or plane form by be with, perhaps can form by under leaving the situation in space bunch 2 being inserted among the shielding 3d, shields 3d and is formed by ready-made hollow tube.Bunch 3 through shielding has better characteristic for undesirable electromagnetic radiation like this.
Each root in above-mentioned bunch 1, bunch 2 and the bunch 3 according to circumstances has predetermined length, and has reservation shape.When bunch was installed in the device, this reservation shape might not need identical with net shape, and this reservation shape includes to be beneficial to bunch is installed to shape in the device.The installation component (connector) that is used for the two ends of bunch easily are connected to electric components can be connected to these bunch in advance.
In each root in above-mentioned bunch 1, bunch 2 and bunch 3, between covering member and retaining member, there is a space.Not only there is the effect (will be described later) of improving property feature in this space, also has to make and can assign to form the effect of this bunch by the hollow bulb that the conductive member (insulate line) that covering member covered is passed retaining member when making bunch.
Although the bunch shown in Fig. 5 A to Fig. 5 C comprises a conductive member or two conductive members, when bunch has three or more conductive members, also can use similar structure.Bunch with said structure can prevent from overlayer is damaged, because insulate line is maintained in the retaining member.
The electrical characteristics that below explanation had the bunch of this structure.At first, will the common features of all situations be described with reference to figure 5A.Retaining member 1a has such intensity, even it makes that retaining member 1a can not produce big distortion yet when retaining member 1a is installed in the device.Thereby the cross sectional shape of bunch 1 changes hardly.Therefore, as the distance D 1 of retaining member 1a overall diameter, keep substantially invariable value as the distance D 2 of the insulation thickness of retaining member 1a with as the distance D 3 of covering member 1b overall diameter.Since retaining member 1a be placed on device (for example cabinet of making by iron or aluminium 63 (seeing Figure 11)) the conductive material casing near, therefore between conductive member 1c and conductive material casing, produced electric capacity.
The relation that to adjust the distance below between D1, distance D 2 and distance D 3 and the capacitance size describes.Distance D 3 as covering member 1b overall diameter is determined by the electric current of the conductive member 1c that flows through and the size of the voltage that is applied to conductive member 1c.In the present embodiment, distance D 3 is diameters of 2.7mm (millimeter).The present inventor is concerned about such fact: when being fixed under the situation of 2.7mm diameter in the distance D 3 as covering member 1b overall diameter, differently change as the distance D 1 of retaining member 1a overall diameter with as the distance D 2 of the insulation thickness of retaining member 1a, and from driving and control module when exporting constant electric power, the size of mobile electric current changes according to the size of distance D 1 and D2 in fluorescent display tube.The inventor has obtained expected relationship between distance D 1, distance D 2 and the distance D 3 by test.
(embodiment)
Below embodiment will be described.Fig. 6 is the embodiment from the radiative back lighting device in back of picture display face.Back lighting device shown in Fig. 6 comprises as the part of the luminescence unit 23a of an embodiment of the luminescence unit shown in Fig. 2 23, has the bunch 1A to 1D of similar structures as the driving of an embodiment of driving shown in Fig. 3 and control module 5 and control module 5a and with the bunch 1 shown in Fig. 5 A.That is, present embodiment is an embodiment from the radiative back lighting device in back of picture display face, and wherein back lighting device comprises: with acting on driving and the control module 5a that the driving power of alternating electromotive force unit is provided; Have cold cathode fluorescent tube that is provided to alternating electromotive force and the luminescence unit 23a that keeps the casing of cold cathode fluorescent tube; Comprise bunch as the bunch 1A to 1D of the conductive member that covers by insulating material, wherein conductive member will drive with control module 5a and cold cathode fluorescent tube and be connected with each other, to form conducting between driving and control module 5a and the cold cathode fluorescent tube, conductive member is leaving the retaining member encirclement of being made by insulating material under the situation in space, and place along casing, retaining member has suppressed the leakage of alternating electromotive force.
Although in an embodiment, luminescence unit 23a forms by 22 cold cathode fluorescent tubes are arranged parallel to each other, and Fig. 6 only shows two cold cathode fluorescent tubes 10 and 11, and other 20 cold cathode fluorescent tubes are not shown.
Driving and control module 5a also have transformer TR except having driving shown in Fig. 3 and control module 5.Transformer TR has elementary winding N1 and secondary winding N2.Owing to by reducing the degree of coupling between elementary winding N1 and the secondary winding N2, improved leakage inductance, so the electric capacity of leakage inductance and capacitor C1 formed resonant circuit, thereby to take place at the secondary winding N2 place of transformer TR be the waveform of sine wave substantially.The electric current of this sinusoidal form unshowned other 40 bunch among bunch 1A to 1D and Fig. 6 of flowing through, with light cold cathode fluorescent tube 10 and 11 and Fig. 6 in unshowned other 20 cold cathode fluorescent tubes.Therefore, compare, reduced undesirable electromagnetic radiation with the situation that cold cathode fluorescent tube is lighted by square wave.Driving and control circuit 15 are provided to for example be the alternating voltage of 300V (volt).By the elementary winding N1 of about adjustment transformer TR and the turn ratio between the secondary winding N2, secondary winding N2 provides 700V (RMS value).
Although driving shown in Fig. 3 and control circuit 15 are used as driving and control circuit among driving and the control module 5a, also can use the driving and the control circuit 105 of the use resonant circuit shown in Fig. 4.In this case, be placed on drive and control circuit 105 in converter transformer PIT can be used to instead of transformers TR, and comprise that each root in 44 bunch of bunch 1A to 1D of secondary winding N2 of the transformer TR that is connected among Fig. 6 all is connected to the secondary winding N102 of converter transformer PIT.Thereby, can drive 22 cold cathode fluorescent tubes that comprise cold cathode fluorescent tube 10 and cold cathode fluorescent tube 11.When using driving and control circuit 105, not necessarily need to provide capacitor C1.Among each embodiment of Fig. 7, Fig. 9 and Figure 15, driving and control circuit 105 can be used to substitute and drive and control circuit 15 below.In this case, as mentioned above,, therefore not necessarily need to provide capacitor C1 because converter transformer PIT has stoped the DC component to be transferred to primary side.
Each root among bunch 1A, bunch 1B, bunch 1C and the bunch 1D and the bunch 1 shown in Fig. 5 A have same structure.Although used 44 bunch with same structure, Fig. 6 only shows 4 bunch, and other 40 bunch are not shown.In addition, bunch 1A to 1D and other 40 bunch do not have equal length, but are cut into predetermined length in advance.Use this bunch can make liquid crystal indicator at short notice, and improve the volume production effect.
In the present embodiment, the mean value of the length of 44 bunch is 750mm, and this is longer than the 100mm in the situation (not shown) that driving and control circuit is provided for each cold cathode fluorescent tube and driving and control circuit and cold cathode fluorescent tube are connected with each other.In addition, can 22 bunch (comprising bunch 1A and bunch 1B) on right side be bound together by utilizing the binding band, and utilize the binding band that 22 bunch (comprising bunch 1C and bunch 1D) in left side are bound together, and 22 bunch on right side and 22 bunch in left side are formed reservation shape, are bigger bunch with 44 bunch in groups.Yet 44 bunch are independent of each other in the present embodiment.In the present embodiment, as mentioned above, be 2.7mm (millimeter) as the distance D 3 of covering member 1b overall diameter, be 4mm as the distance D 1 of retaining member 1a overall diameter, be 0.5mm as the distance D 2 of the insulation thickness of retaining member 1a.The mean value of the size of current that flows in 22 cold cathode fluorescent tubes is 5.859mA (milliampere: the RMS value) in this case.In addition, tygon is used as the insulating material of retaining member.
(comparative examples)
Fig. 7 shows and is used for and present embodiment comparative examples relatively.In comparative examples, different with present embodiment, drive and control module 5a and line between the cold cathode fluorescent tube that is arranged in the luminescence unit 23 are by the bunch execution that does not have retaining member 1a, that is, by by covering member 1b being positioned over the insulate line execution that forms around the conductive member 1c.In Fig. 6, identify by label 50A, label 50B, label 50C and label 50D by covering member 1b being positioned over the corresponding insulate line that forms around the conductive member 1c.When using the embodiment that is set as 2.7mm (millimeter) diameter with distance D 3 to have the insulate line of identical structure and equal length, the mean value of the size of current that flows in 22 cold cathode fluorescent tubes is 5.446mA (milliampere: the RMS value).
Because the brightness of cold cathode fluorescent tube is proportional to the electric current that flows in cold cathode fluorescent tube, therefore be necessary to compensate leakage current, so that cold cathode fluorescent tube has predetermined luminance.In above-mentioned example, observe that the leakage current in the bunch has 7% increase under the situation that does not have retaining member 1a, this increase is equal to 7% minimizing of the power conversion efficient of above-mentioned power supply unit.Thereby in order to compensate this minimizing, the situation that has the bunch of retaining member 1a with use is compared, and the electric power that offers bunch need increase by 7%.On the contrary, use bunch to be equal to 7% increase of power conversion efficient with retaining member 1a.
Thereby, when from driving and control module 5a when same power is provided, bunch with retaining member 1a can send higher electric current to cold cathode fluorescent tube compared with the bunch that does not have retaining member 1a, thereby allows more effective use to provide self-driven and electric power control module 5a.As a result, improve the power-efficient of liquid crystal indicator, and saved electric power.
(difference between the leakage current in embodiment and the comparative examples)
Present inventor hypothesis produces a principal element that this electric power reduces effect when bunch has retaining member 1a be size from the leakage current of bunch.Promptly, thinking not every provides self-driven and electric power control module 5a all to arrive cold cathode fluorescent tube, because the electric capacity between each root among bunch 1A shown in Figure 6 etc. or bunch 50A shown in Figure 7 etc. and the cabinet made by iron or aluminium, and such as the electric capacity between the bunch of bunch 1A etc., or, caused that the power leakage that self-driven and control module 5a are provided is as leakage current such as the electric capacity between the bunch of bunch 50A etc.As a result, the size of current of arrival cold cathode fluorescent tube reduces.
That is, all uprise and increase along with the voltage that is applied to bunch from the leakage current of the bunch 1A shown in Fig. 6 with from the leakage current of the bunch 50A shown in Fig. 7, along with the length of bunch is elongated and increase, and along with bunch becomes nearer and increase from the metal cabinet.For example, when the voltage that is applied to bunch is the sine voltage of about 700V, the length of bunch be tens cm (centimetre) to about 1m, and when bunch closely sticks on the metal cabinet by bonding agent, adhesive tape etc., cannot be left in the basket from the size of the leakage current of bunch 1A with from the difference between the size of the leakage current of bunch 50A.Under the situation that screen size increases and the thickness of liquid crystal indicator reduces, the trend increasing that leakage current increases.
At first will describe causing the electric capacity that leakage current takes place.Fig. 6 and Fig. 7 schematically show the part of in esse these electric capacity.In Fig. 6, capacitor C AN is the electric capacity between bunch 1A and iron or the aluminium cabinet.Capacitor C BN is the electric capacity between bunch 1B and iron or the aluminium cabinet.Capacitor C CN is the electric capacity between bunch 1C and iron or the aluminium cabinet.Capacitor C DN is the electric capacity between bunch 1D and iron or the aluminium cabinet.Also there is electric capacity between each root in other 40 bunch and iron or the aluminium cabinet.Yet the electric capacity between other 40 bunch and iron or the aluminium cabinet is not shown in Figure 6.
Capacitor C ABN is the electric capacity that is present between bunch 1A and the bunch 1B.Capacitor C CDN is the electric capacity that is present between bunch 1C and the bunch 1D.In addition, between other 40 bunch that extend parallel to each other, also there is electric capacity, but not shown in Figure 6.In addition, also there is electric capacity between bunch 1A and bunch 1C or the bunch 1D and between bunch 1B and bunch 1C or bunch 1D.But, because bunch 1A separates placement with bunch 1C with bunch 1D with bunch 1B, and bunch 1A and bunch 1B extend and bunch 1C and bunch 1D direction extension left to right, and therefore the electric capacity between the bunch of the bunch of right extension and direction extension left is the little value that needn't consider.
In Fig. 7, capacitor C A is the electric capacity between line 50A and iron or the aluminium cabinet.Capacitor C B is the electric capacity between line 50B and iron or the aluminium cabinet.Capacitor C C is the electric capacity between line 50C and iron or the aluminium cabinet.Capacitor C D is the electric capacity between line 50D and iron or the aluminium cabinet.Also there is electric capacity between each root in other 40 bunch and iron or the aluminium cabinet.Yet the electric capacity between other 40 bunch and iron or the aluminium cabinet is not shown in Figure 7.
Capacitor C AB is the electric capacity that is present between line 50A and the line 50B.Capacitor C CD is the electric capacity that is present between line 50C and the line 50D.In addition, between other 40 bunch that extend parallel to each other, also there is electric capacity, but not shown in Figure 7.In addition, also there is electric capacity between online 50A and line 50C or the line 50D and between online 50B and line 50C or the line 50D.But, because line 50A separates placement with line 50C with line 50D with line 50B, and line 50A and line 50B extend and line 50C and line 50D direction extension left to right, and therefore the electric capacity between the line of the line of right extension and direction extension left is the little value that needn't consider.
In addition, although above-mentioned electric capacity is equal to expression by a capacitor in each of Fig. 6 and Fig. 7, electric capacity is actually the electric capacity of distribution.In each situation of all fixing in distance D 1, distance D 2 and distance D 3, when iron or aluminium cabinet and retaining member 1a contact with each other, and when retaining member 1a was clipped between iron or aluminium cabinet and the covering member 1b, the electric capacity between conductive member 1c and iron or the aluminium cabinet was the highest.On the other hand, when the space between conductive member 1c and iron or the aluminium cabinet was maximum, the electric capacity between conductive member 1c and iron or the aluminium cabinet was minimum.
Thereby capacitance size not only depends on distance D 1, distance D 2 and distance D 3, depends on also covering member 1b (being conductive member 1c) is how to be placed among the retaining member 1a.In the conductive member 1c that makes every bunch and iron or the minimized desired configuration of aluminium cabinet, conductive member 1c is adhered on the wall of retaining member 1a, and the surface of having pasted conductive member 1c is placed on and iron or aluminium cabinet distance far away as far as possible.Yet,, may require stickup and direction are managed, thereby cause the volume production rate relatively poor in order to adopt this structure.As another kind of collocation form, consider such situation: with insulating material (dielectric substance) packing space, so that conductive member 1c is placed on the side of retaining member 1a.Yet in this case, the dielectric substance with high relative dielectric constant has increased electric capacity conversely.On the other hand, because the relative dielectric constant of air is 1 substantially, so prevented the increase of electric capacity in the inner space that is filled with air that forms of retaining member 1a.
Based on above-mentioned viewpoint, inventor's find to adjust the distance scope of D1, distance D 2 and distance D 3 has some restriction, reduces the desired effects of leakage current with performance.Particularly, when comparing distance D 1 with distance D 3 when too big, conductive member 1c contacts with the bottom surface (surface of its lowest position on gravity direction) of retaining member 1a, reduces effect thereby possibly can't give play to leakage current.When comparing distance D 2 with distance D 1 when too big, promptly when its thickness was too big by the wall thickness of the retaining member 1a of distance D 2 expressions, dielectric substance had increased electric capacity, thereby has increased leakage current value on the contrary.Thereby, the material ideal ground that is used for retaining member 1a is the insulating material with low-k, and the material require that is used for retaining member 1a is flexible, so that connected up as the bunch in the device, keep the hardness as retaining member simultaneously, promptly the hardness degree can be with by for example binding at retaining member and resist extruding force when binding.Therefore, tygon is used as retaining member.
Be necessary at (in first preset range) within the preset range as the retaining member excircle inner area of the cross-sectional area that surrounds by retaining member 1a excircle with as the ratio between the retaining member cross-sectional area of the cross-sectional area of the retaining member that forms by tygon.In addition, the ratio between the covering member excircle inner area of the cross-sectional area that surrounds as the retaining member spatial area of the cross-sectional area that is surrounded by the inner periphery of retaining member 1a with as the excircle by covering member 1b is necessary at (in second preset range) within the preset range.In the present embodiment, each in retaining member excircle inner area, retaining member cross-sectional area, retaining member spatial area and the covering member excircle inner area all is the area with circular plane.Therefore, above-mentioned ratio can be by diameter than expression.Particularly, ratio between distance D 1 and distance D 2 is in preset range (in first preset range), and as the distance of the difference between distance D 1 and the distance D 2 and the ratio between the distance D 3 in preset range when (in second preset range), electric capacity between bunch and iron or the aluminium cabinet has reduced, and has obtained the effect that favourable leakage current reduces.
These two preset ranges (first preset range and second preset range) are can be from the value of utilizing magnitude of leakage current for example to obtain as the trial value of evaluation criterion.In addition, the action at the capacitor C ABN between the bunch shown in Figure 6 and capacitor C CDN and capacitor C AB between line shown in Figure 7 and capacitor C CD will be described later.In the situation of the bunch shown in Fig. 5 B 2, capacitance size between the bunch and the capacitance size between the line depend on as the size of the distance D 4 of distance between conductive member 2c and the conductive member 3c and difference.
Fig. 8 A is the sectional view along the bunch 31 of the longitudinal direction intercepting of bunch 31.In Fig. 8 A, conductive member 1c and covering member 1b bending contact with the inner circumferential surface of retaining member 1a simultaneously randomly.In this case, electric capacity between bunch 31 and iron or the aluminium cabinet can be considered to the average capacitance when conductive member 1c passes the center of retaining member 1a, the recruitment of this electric capacity is corresponding with the length increase of conductive member 1c, and the length of conductive member 1c increases with crooked corresponding.That is, by the effect of retaining member 1a, bunch 31 can be considered to realize being equal to the effect that line is connected up, thereby line is floated in the space, is maintained to the certain distance of iron or aluminium cabinet simultaneously.
In order to obtain this effect, consider to make the length of covering member 1b longer than the length of retaining member 1a.Like this, the outside surface of covering member 1b contacts with the inside surface of retaining member 1a under the situation of bending.As a result, can realize a kind of like this bunch: between bunch and iron or aluminium cabinet, have smaller capacitive.
The another kind of bunch that forms based on this principle is the bunch 32 shown in Fig. 8 B.Bunch 32 is the improvement to the bunch 2 shown in Fig. 5 B.Bunch 32 has the covering member 2b and the covering member 3b of bending in retaining member 2a and retaining member 3a respectively.In addition, can form the bunch with four conductive members 34 shown in Fig. 8 C.Bunch 34 has the covering member in corresponding retaining member interior curve.Although Fig. 8 C shows the example of the bunch 34 with four conductive members, the number of conductive member is not had technical restriction, also can form and have the more bunch of the conductive member of big figure.
(using other preferred embodiments of the liquid crystal indicator of bunch)
, will other preferred embodiments of the back lighting device that use above-mentioned bunch be described to Figure 16 with reference to figure 9.The bunch that the secondary figure of among Fig. 9 to Figure 16 each shows luminescence unit, driving and control module, luminescence unit and driving and control module are connected with each other, and other parts are not shown is because similar among other parts and Fig. 2.
Fig. 9 shows such luminescence unit and driving and control module: when the cold cathode fluorescent tube 10 in being placed on luminescence unit 23b was longer in a longitudinal direction, it had produced the effect that reduces leakage current greatly.(covering member 1b and conductive member 1c are not shown in Figure 9 for 1b, 1c) the covering member 1b of the bunch shown in the presentation graphs 5A 1 and conductive member 1c for label among Fig. 9.In Fig. 9, an electrode terminal of cold cathode fluorescent tube 10 is connected to a terminal of the secondary winding of transformer TR by short relatively connecting line, and another electrode terminal of cold cathode fluorescent tube 10 is connected to the another terminal of the secondary winding of transformer TR by long bunch 1.Because the conductive member 1c and the electric capacity between iron or the aluminium cabinet of bunch 1 are little, as mentioned above, even therefore bunch 1 is long, magnitude of leakage current also can be reduced to an a small amount of.When the bunch shown in Fig. 8 A 31 is used to substitute bunch 1, also can produce similar effects.
Figure 10 shows such luminescence unit and driving and control module 5a: when the cold cathode fluorescent tube 10 in being placed on luminescence unit 23b was long in a longitudinal direction, it had produced the effect that reduces leakage current greatly, has also reduced undesirable electromagnetic radiation.Label (2b among Figure 10,2c) and label (3b, 3c) the covering member 2b of the bunch shown in the presentation graphs 5B 2 and conductive member 2c and covering member 3b and conductive member 3c, covering member 2b and conductive member 2c and covering member 3b and conductive member 3c are not shown in Figure 10.Each electrode terminal that its electrode terminal is placed the cold cathode fluorescent tube 10 at two ends in a longitudinal direction is connected to by short relatively connecting line to have same structure and has transformer whose drain inductance TRa and the terminal of the secondary winding N2 of transformer TRb.The another terminal ground connection of the secondary winding N2 of transformer TRa and transformer TRb.Transformer TRa and transformer TRb are to move with the similar mode of above-mentioned transformer TR.The leakage inductance of transformer TRa and transformer TRb and capacitor C1 have formed resonant circuit.Sine voltage is applied to each electrode of cold cathode fluorescent tube 10.The winding polarity of transformer TRa and transformer TRb is selected such that the voltage V1 and the voltage V2 that are applied to respective electrode are opposite polarities.
The arrangement that transformer TRa and driving and control circuit 15 are located adjacent one another.The elementary winding N1 of transformer TRa is connected to by short connecting line and drives and control circuit 15.On the other hand, transformer TRb is placed near the electrode of the end on the longitudinal direction that places cold cathode fluorescent tube 10.Therefore, transformer TRb is away from driving and control circuit 15, thereby the elementary winding N1 of transformer TRb is connected to driving and control circuit 15 by long bunch 2.Even when transformer TRb so away from driving and during control circuit 15, can make also that to flow to the magnitude of leakage current of iron or aluminium cabinet from bunch 2 less.In addition, be made as the number of turn, can reduce the voltage that is applied to bunch 2, thereby further reduce the size of leakage current greater than the elementary winding N1 of transformer TRb by the number of turn with the secondary winding N2 of transformer TRb.In the present embodiment, transformer TRb has formed load circuit with cold cathode fluorescent tube.
Exist between the conductive member 2c of the bunch 2 in Figure 10 and the conductive member 3c and the similar electric capacity of capacitor C ABN shown in Fig. 6.Leakage current flows via electric capacity.The size of the leakage current that is caused by the electric capacity between the line depends on difference between the voltage that is applied to conductive member 2c adjacent one another are and conductive member 3c and difference, and the amount of undesirable electromagnetic radiation depends on and flows through conductive member 2c adjacent one another are and the direction of current of conductive member 3c and different.
Because an end of each among conductive member 2c and the conductive member 3c is connected to the elementary winding of transformer TRb, therefore the voltage of opposite polarity is applied to conductive member 2c adjacent one another are and conductive member 3c, and electric current flows through conductive member 2c and conductive member 3c in opposite direction adjacent one another are.As for electric capacity, because the distance between conductive member 2c and the conductive member 3c is made substantially constant by retaining member 2a and retaining member 3a with being equal in the bunch 2, so capacitance is proportional to the length of bunch 2.Because conductive member 2c and conductive member 3c are separated from one another via the space that is formed by retaining member 2a and retaining member 3a, therefore compare with the situation that covering member 3b closely contacts each other with covering member 2b, reduced capacitance size.
Thereby, with the corresponding leakage current value of electric capacity little than when covering member 2b closely contacts each other with covering member 3b.The direction of current of conductive member 2c and conductive member 3c is opposite each other owing to flow through, and therefore can think that aspect electromagnetism electromagnetic radiation takes place from short dipole, and can reduce the undesirable electromagnetic radiation amount.In addition, in the embodiment shown in fig. 10, bunch 32 can be used to substitute bunch 2.In addition, when in luminescence unit 23, arranging a plurality of cold cathode fluorescent tubes 10 (for example 22 cold cathode fluorescent tubes 10) rather than a cold cathode fluorescent tube 10, the electrode of corresponding cold cathode fluorescent tube can be connected in parallel with each other, thereby makes a plurality of cold cathode fluorescent tubes can be simultaneously luminous.
Figure 11 shows such luminescence unit and driving and control module: when a plurality of cold cathode fluorescent tubes were placed among the luminescence unit 23b, it had produced the effect that reduces leakage current greatly.Although two cold cathode fluorescent tubes 10 and 11 have been shown among Figure 11,, in the situation of using three or more cold cathode fluorescent tubes, can obtain similar effect by adopting similar configuration.In this case, when the allow current capacity of the every conductive member that forms bunch is set as the current capacity of every cold cathode fluorescent tube, can adapt to the cold cathode fluorescent tube of arbitrary number by the bunch that formation has some conductive members, wherein the number of conductive member is corresponding to the number of cold cathode fluorescent tube.
In Figure 11, a terminal of the secondary winding of transformer TR is connected to the conductive member 3c of the bunch 2 on the conductive member 2c of bunch 2 on right side and right side, and the another terminal of the secondary winding of transformer TR is connected to the conductive member 3c of the bunch 2 in the conductive member 2c of bunch 2 in left side and left side.In this case, the conductive member 2c of the bunch 2 on the right side of flowing through is identical with the direction of current of conductive member 3c, and conductive member 2c and conductive member 3c be in same current potential, thereby does not produce voltage between conductive member 2c and conductive member 3c.Thereby the electric capacity that does not have leakage current to flow through and between conductive member 2c and conductive member 3c, form, thereby have only the component that flows to iron or aluminium cabinet to constitute leakage current.Similarly, the conductive member 2c of the bunch 2 on the left of flowing through is identical with the direction of current of conductive member 3c, and conductive member 2c and conductive member 3c are in same current potential, thereby do not have the electric capacity that forms between conductive member 2c that leakage current flows through at the bunch 2 in left side and the conductive member 3c.Thereby can make magnitude of leakage current littler.
Than Figure 11, Figure 12 shows to have with the luminescence unit 23a of identical configuration shown in Figure 11, has and the driving of identical configuration shown in Fig. 6 and the bunch 2 shown in control module 5a and Fig. 5 B.In Figure 12, a terminal of the secondary winding of transformer TR is connected to the conductive member 3c of the bunch 2 in the conductive member 2c of bunch 2 on right side and left side, and the another terminal of the secondary winding of transformer TR is connected to the conductive member 2c of the bunch 2 in the conductive member 3c of bunch 2 on right side and left side.Thereby, can make among the direction of current of the conductive member adjacent one another are of flowing through and Figure 10 opposite each other.In this case, can reduce undesirable radiant quantity, as mentioned above.In addition, in each of Figure 11 and Figure 12, above-mentioned bunch 32 can be used to substitute bunch 2.
At above-mentioned Fig. 6 and Fig. 9 to each back lighting device shown in Figure 12, with the driving and the control module that act on the driving power unit that generates alternating electromotive force, and the luminescence unit that is used as the load circuit that is provided to alternating electromotive force, be connected with each other by the bunch shown in Fig. 5 A or Fig. 5 B, and this bunch has suppressed the leakage current from conductive member with conductive member and retaining member.In a large amount of cold cathode fluorescent tubes were used in situation in the luminescence unit, when these cold cathode fluorescent tubes were connected in parallel with each other simply as mentioned above, the electric current of each cold cathode fluorescent tube of flowing through may be inconsistent in size.This is because from driving and control module differs from one another to the path of each cold cathode fluorescent tube, thereby differ from one another, and because the cold cathode fluorescent tube self characteristics also changes from the size of leakage current that will drive and control module is connected to the conductive member of each cold cathode fluorescent tube.Figure 13 to Figure 15 shows and drives and the configuration of control module, and the size of current of its this cold cathode fluorescent tube that can prevent to flow through differs from one another, and can present the electric current of homogeneous to each cold cathode fluorescent tube.Figure 16 shows the back lighting device that uses this driving and control module.
Driving shown in Figure 13 uses balancing coil Lb to make the electric current I n1 of the cold cathode fluorescent tube 10 of flowing through consistent with the electric current I n2 of the cold cathode fluorescent tube 11 of flowing through with control module 5b.Balancing coil Lb is also referred to as common mode choke.When the number of turn of winding NLb1 equaled the number of turn of winding NLb2, the electric current that flows into from terminal Lbi was divided into electric current I n1 that flows from terminal Lbo1 and the electric current I n2 that flows from terminal Lbo2.Balancing coil Lb is used for making the size of electric current I n1 and the equal and opposite in direction of electric current I n2.Particularly, extract electric current I n1, extract electric current I n2 from the winding top of winding NLb2 from the winding end of winding NLb1.Because winding NLb1 and winding NLb2 be magnetic coupling closely each other, the electromotive force according to the difference between electric current I n1 and the electric current I n2 therefore occurs in each winding, and feedback effect makes electric current I n1 equate with electric current I n2.In addition, contact C1b1 and contact C1a1, contact C1b2 and contact C1a2 and contact C2b and contact C2a are the contacts of connector, and are used to make driving can separate with luminescence unit 23a with control module 5b.
Driving shown in Figure 14 and control module 5c use one group of a plurality of balancing coil as balancing coil Lb, the electric current I n2 that will be divided into the electric current I n1 that flows from terminal Lbo1 from the electric current that terminal Lbi flows into, flow from terminal Lbo2, the electric current I n3 that flows from terminal Lbo3 and the electric current I n4 that flows from terminal Lbo4.Equal the number of turn of winding NLb2 when the number of turn of winding NLb1, the number of turn of winding NLb3 equals the number of turn of winding NLb4, and when the number of turn of winding NLb5 equaled the number of turn of winding NLb6, the size of the size of the size of the electric current I n2 of the size of the electric current I n1 of cold cathode fluorescent tube 10, cold cathode fluorescent tube 11, the electric current I n3 of cold cathode fluorescent tube 12 and the electric current I n4 of cold cathode fluorescent tube 13 all was equal to each other.In addition, contact C1b1 and contact C1a1, contact C1b2 and contact C1a2, contact C1b3 and contact C1a3, contact C1b4 and contact C1a4 and contact C2b and contact C2a are the contacts of connector, and are used to make driving can separate with luminescence unit 23a with control module 5c.
Figure 15 shows the back lighting device of the liquid crystal indicator shown in Figure 1A and Figure 1B and Fig. 2.The terminal of the secondary winding N2 of transformer TR among driving and the control module 5a is connected to the conductive member of bunch 1f via connector CNA.The conductive member of bunch 1f is connected to balancing coil unit 64a via connector CNC.The another terminal of the secondary winding N2 of transformer TR is connected to the conductive member of bunch 1g via connector CNB.The conductive member of bunch 1g is connected to balancing coil unit 64b via connector CND.Balancing coil unit 64a and luminescence unit 23a are connected with each other via connector CN1a to CN22a.Balancing coil unit 64b and luminescence unit 23a are connected with each other via connector CN1b to CN22b.In this case, the voltage that generates at the secondary winding N2 two ends of transformer TR is 700V (volt), and the length of the bunch 1g of the longer bunch of conduct is 750mm (millimeter).Because this high voltage is applied to long bunch, therefore when bunch in the past was used to substitute bunch 1g, the size of leakage current became higher.
Back lighting device shown in Figure 15 has used two balancing coil unit, i.e. balancing coil unit 64a and balance coil unit 64b.Yet as shown in figure 14, balancing unit can only be used in an electrode side, and the electrode on another electrode side can be directly connected to each other, and does not use balancing unit.Yet, on two electrode sides, all provide balancing coil can improve the homogeneity of each cold cathode fluorescent tube of flowing through as shown in figure 15.
In addition, as shown in figure 10, two transformers, promptly transformer TRa and transformer TRb can have following configuration: the secondary winding N2 of transformer TRa is connected to balancing coil unit 64a, and the secondary winding N2 of transformer TRb is connected to balancing coil unit 64b.In this case, transformer TRb is caught to have the structure identical with transformer TRa, and the number of turn that is placed on each the secondary winding N2 among transformer TRa and the transformer TRb is caught greater than the number of turn that is placed on each the elementary winding N1 among transformer TRa and the transformer TRb, thereby has reduced the magnitude of voltage that is applied to as the bunch 1g of longer bunch.Thereby can further suppress leakage current.For example, when the number of turn of elementary winding N1 is 1 and the number of turn of secondary winding N2 when being 4, the voltage that is applied to bunch 1g can be reduced to 1/4 of voltage under the situation that transformer TRb is not provided.Thereby can suppress leakage current.Yet owing to used two transformers, therefore from reducing the angle of plant bulk, the configuration that the use bunch 1g in the present embodiment suppresses leakage current is favourable.
Balancing coil Lb1a to Lb21a is arranged among the balancing coil unit 64a, and balancing coil Lb1b to Lb21b is arranged among the balancing coil unit 64b, so that the feasible electric current that is arranged in each cold cathode fluorescent tube among the luminescence unit 23a of flowing through equates.In each balancing coil except balancing coil Lb20a and balancing coil Lb20b, the number of turn that forms two windings of balancing coil is equal to each other.In balancing coil Lb20a and balancing coil Lb20b, two cold cathode fluorescent tubes are connected to a winding, and eight cold cathode fluorescent tubes are connected to another winding.Thereby, suppose that the number of turn of the winding that these eight cold cathode fluorescent tubes are connected to is 1, and the number of turn of the winding that these two cold cathode fluorescent tubes are connected to is 4.
Figure 16 shows and drives and the arrangement (Figure 16 only shows 22 cold cathode fluorescent tube 10 and cold cathode fluorescent tubes 11 in the cold cathode fluorescent tube, and other 20 cold cathode fluorescent tubes that are arranged in parallel with each other are not shown) on cabinet 63 of control module 5a, balancing coil unit 64a, balancing coil unit 64b, bunch 1f, bunch 1g and cold cathode fluorescent tube.In this case, the bunch 1 shown in bunch 1f and bunch 1g and Fig. 5 A has same structure.In arrangement shown in Figure 16, bunch 1f and bunch 1g are used to reduce to leak into the electric current of the cabinet of being made by iron with electric conductivity or aluminium 63, balancing coil unit 64a and balance coil unit 64b are used to make the electric current homogeneous of each cold cathode fluorescent tube of flowing through, thereby make from the brightness homogeneous of the light of each cold cathode fluorescent tube emission.
Although, also do not arranged the signal-processing board and the panel drive circuit plate that are included in panel driving unit 21 (see figure 2)s shown in Figure 16 of the arrangement of the component part that liquid crystal indicator is shown.Panel driving unit 21 has occupied very big plate area as a whole, and panel driving unit 21 is handled than driving and the higher frequency of control module 5a.Therefore, pay the utmost attention to the arrangement position of panel driving unit 21.Be difficult to and drive and control module 5a is placed near the electrode of cold cathode fluorescent tube.Inevitably, bunch 1f and bunch 1g tend to have inconsistent length, and both or one of them among bunch 1f and the bunch 1g are tended to length and increased.Consider the situation of this liquid crystal indicator, have the bunch 1f of same structure and leakage current that bunch 1g produces with the bunch 1 shown in Fig. 5 A to reduce effect be tangible by utilizing.
Figure 17 illustrates the example that the bunch 2 shown in the bunch 1 shown in Fig. 5 A and Fig. 5 B is applied to light-emitting device.All embodiments relevant with above-mentioned back lighting device can be applicable to this light-emitting device.Similar shown in the circuit part of light-emitting device and Figure 13.In light-emitting device shown in Figure 17, two cold cathode fluorescent tubes only are provided, i.e. cold cathode fluorescent tube 81a and cold cathode fluorescent tube 81b substitute cold cathode fluorescent tube 10 and cold cathode fluorescent tube 11 among the luminescence unit 23a of Figure 13.Bunch 2 (not shown in Figure 17) will drive and the terminal Lbo1 of control module 5b is connected to the electrode (not shown in Figure 17) of cold cathode fluorescent tube 81a via contact C1b1 and contact C1a1, and will drive an electrode (not shown in Figure 17) that is connected to cold cathode fluorescent tube 81b with the terminal Lbo2 of control module 5b via contact C1b2 and contact C1a2.Bunch 1 (not shown in Figure 17) will drive and control module 5b in the secondary winding N2 of transformer TR via contact C2b and contact C2a, be connected to another electrode (not shown in Figure 17) of cold cathode fluorescent tube 81a and another electrode (not shown in Figure 17) of cold cathode fluorescent tube 81b.Supporting member 83 and lampshade 82 are made by the conductive metallic material with hollow space.Line is to form by the hollow space that makes bunch 1 and bunch 2 pass supporting member 83 and cover 82.
Utilize this structure, with acting on driving that the driving power of alternating electromotive force unit is provided and control module 5b (this unit is the big structure division that is attached to the pedestal of light-emitting device) and the cold cathode fluorescent tube that is attached to the top part of light-emitting device and is provided to alternating electromotive force at a distance of long distance.In addition, owing to all make by metal material as the cover 82 of the casing that keeps cold cathode fluorescent tube and the supporting member 83 of maintenance bunch 1 and bunch 2, so the electric capacity between bunch 1 and bunch 2 and these metal materials is big.Yet, can reduce leakage current from bunch 1 and bunch 2, wherein bunch 1 and bunch 2 have the retaining member of being made by insulating material and are leaving the conductive member that surrounds under the situation in space.In addition, be placed on drive and control module 5b in balancing coil Lb can present the electric current of homogeneous to cold cathode fluorescent tube 81a and cold cathode fluorescent tube 81b.
It will be appreciated by those skilled in the art that depending on design requirement can carry out various modifications, combination, sub-portfolio and change with other factors, these modifications, combination, sub-portfolio and change drop in the scope of claims or its equivalent.
Claims (13)
1. bunch comprises:
Conductive member is configured to electric components is connected with each other to conduct;
Covering member is configured to encirclement and covers described conductive member, and described covering member is formed by first insulating material; And
Retaining member is configured to and is leaving the described covering member of encirclement under the situation in space, and described retaining member is formed by second insulating material.
2. bunch as claimed in claim 1,
Wherein, as the retaining member excircle inner area of the cross-sectional area that surrounds by the excircle of described retaining member and as the ratio between the retaining member cross-sectional area of the cross-sectional area of described second insulating material in first preset range, and the ratio between the covering member excircle inner area of the retaining member spatial area of the cross-sectional area that surrounds as the inner periphery by described retaining member and the cross-sectional area that surrounds as the excircle by described covering member is in second preset range.
3. bunch as claimed in claim 1,
Wherein, described retaining member has first retaining member and second retaining member that closely contacts and be arranged parallel to each other substantially substantially each other.
4. bunch as claimed in claim 1,
Wherein, described covering member bending, and the part of described covering member contacts with the inside surface of described retaining member.
5. bunch as claimed in claim 1,
Wherein, be connected to be configured to by one in the described conductive member electric components connected to one another the driving power of alternating electromotive force unit is provided;
Another electric components is connected to the load circuit that has been provided described alternating electromotive force; And
Described retaining member suppresses the leakage of described alternating electromotive force.
6. light-emitting device comprises:
The driving power unit, being configured to provides alternating electromotive force;
Luminescence unit has cold cathode fluorescent tube that has been provided described alternating electromotive force and the casing that is used to keep described cold cathode fluorescent tube; And
Be insulated the conductive member that material covers, described conductive member is connected with each other described driving power unit and described cold cathode fluorescent tube conducting, and described conductive member is surrounded under the situation in space and places along described casing leaving by the retaining member of being made by insulating material;
Wherein, described retaining member suppresses the leakage of described alternating electromotive force.
7. light-emitting device as claimed in claim 6,
Wherein, described luminescence unit has a plurality of cold cathode fluorescent tubes, and alternating electromotive force provides from described driving power unit via balancing coil, and described balancing coil is used to make the electric current homogeneous of cold cathode fluorescent tube of flowing through.
8. one kind is used for from the back lighting device of the back side illuminated of picture display face, and described back lighting device comprises:
The driving power unit, being configured to provides alternating electromotive force;
Luminescence unit has cold cathode fluorescent tube that has been provided described alternating electromotive force and the casing that is used to keep described cold cathode fluorescent tube; And
Be insulated the conductive member that material covers, described conductive member is connected with each other described driving power unit and described cold cathode fluorescent tube conducting, and described conductive member is surrounded under the situation in space and places along described casing leaving by the retaining member of being made by insulating material;
Wherein, described retaining member suppresses the leakage of described alternating electromotive force.
9. back lighting device as claimed in claim 8,
Wherein, provide a plurality of described cold cathode fluorescent tubes, and alternating electromotive force provides from described driving power unit via balancing coil, described balancing coil is used to make the electric current homogeneous of described cold cathode fluorescent tube of flowing through.
10. liquid crystal indicator comprises:
Liquid crystal panel;
The panel driving unit is configured to according to vision signal and generates drive signal, and drives described liquid crystal panel;
Luminescence unit has the cold cathode fluorescent tube that is used for from the back side illuminated of the picture display face of described liquid crystal panel; And
The driving power unit is configured to described luminescence unit alternating electromotive force is provided;
Wherein, a kind of bunch is provided, comprise conductive member, encirclement and cover the covering member of described conductive member and be placed and make the retaining member that surrounds described covering member leaving under the situation in space, described covering member is formed by first insulating material, described retaining member is formed by second insulating material, and
Described driving power unit and described luminescence unit are connected with each other by the described conductive member that forms described bunch.
11. liquid crystal indicator as claimed in claim 10,
Wherein, first retaining member and second retaining member that the described retaining member of described bunch has substantially each other closely contact and is arranged parallel to each other substantially, and be applied to first conductive member that keeps by described first retaining member and the polar orientation of the voltage of second conductive member that kept by described second retaining member differs from one another.
12. liquid crystal indicator as claimed in claim 10,
Wherein, first retaining member and second retaining member that the described retaining member of described bunch has substantially each other closely contact and is arranged parallel to each other substantially, and it is identical with the polar orientation of the voltage of second conductive member that is kept by described second retaining member to be applied to first conductive member that is kept by described first retaining member.
13. liquid crystal indicator as claimed in claim 10,
Wherein, provide a plurality of described cold cathode fluorescent tubes, and alternating electromotive force provides from described driving power unit via balancing coil, described balancing coil is used to make the electric current homogeneous of described cold cathode fluorescent tube of flowing through.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005231556 | 2005-08-10 | ||
| JP2005231556 | 2005-08-10 | ||
| JP2006167318 | 2006-06-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1912693A true CN1912693A (en) | 2007-02-14 |
Family
ID=37721663
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200610109353 Pending CN1912693A (en) | 2005-08-10 | 2006-08-10 | Bundled wire, illuminating device, backlight device and liquid crystal display device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1912693A (en) |
-
2006
- 2006-08-10 CN CN 200610109353 patent/CN1912693A/en active Pending
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Open date: 20070214 |