CN101512220A - Backlight device and liquid crystal display device - Google Patents
Backlight device and liquid crystal display device Download PDFInfo
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- CN101512220A CN101512220A CNA2007800334104A CN200780033410A CN101512220A CN 101512220 A CN101512220 A CN 101512220A CN A2007800334104 A CNA2007800334104 A CN A2007800334104A CN 200780033410 A CN200780033410 A CN 200780033410A CN 101512220 A CN101512220 A CN 101512220A
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Abstract
A fluorescent tube is prevented from being wrongly attached and broken when being attached, and luminance nonuniformity of backlight due to luminance difference generated in the tube axis direction of the fluorescent tube is reduced. In a backlight device (2), a plurality of fluorescent tube sets, each of which is composed of four fluorescent tubes (21) having electrodes (211) at the both ends and a pair of lamp holders (5) storing portions close to the both electrodes at the both ends of the four fluorescent tubes (21), and the fluorescent tube sets are driven by a pair of inverter circuit board. The backlight device (2) is provided with a power transmitting member (10), which is connected to electrodes (211) at the ends on one side of the two fluorescent tubes (21), for every two adjacent fluorescent tubes configuring the fluorescent tube set, gathers wirings (9) from the electrodes (211) at the ends and transmits power; and a conduction member (7), which is connected to the electrodes (211) on the other side of the two fluorescent tubes and permits a current to flow between the electrodes at the other ends. In the lamp holder (5), the power transmitting members (10) and the conductive members (7) are alternately arranged.
Description
Technical field
The present invention relates to have the backlight arrangement that utilizes many fluorescent tubes that inverter circuit drives, and use the liquid crystal indicator of this backlight arrangement.
Background technology
In recent years, along with the increase of the picture of LCD TV etc., backlight also is required to maximize.In order to tackle the requirement of this maximization; Requirements such as energy-conservation, cheapness are arranged again, develop following backlight, thereby promptly by the crooked bend pipe fluorescent lamp of making U-shaped or C shape of approximate center part, and with this bend pipe fluorescent lamp with the straight tube fluorescent lamp of longer dimension as light source, to replace existing straight tube fluorescent lamp.
Under the situation of the backlight that adopts above-mentioned bend pipe fluorescent lamp, for 17 cun less than its Temperature Distribution of picture size more even, even on tube axial direction, produce some temperature difference or luminance difference also not too can become problem.But, along with picture is increasing, except more and more higher as the temperature at the lamp electrode portion of main pyrotoxin place, also the size lengthening because of lamp also increases the voltage that puts on lamp, and the stray capacitance of the thing followed between the lamp unit makes and be easy to generate leakage current near high-voltage section.In addition, owing to the power of the inverter power along with lamp increases, therefore, the caloric value that is disposed at the inverter of lamp electrode portion dorsal part also increases.Its result makes that the temperature difference on the fluorescent tube direction of principal axis becomes big.
Again, because the generation of above-mentioned leakage current makes with the current value after rated current and the leakage current addition lamp is lighted near the tube axial direction high-voltage section that this just becomes the reason that produces luminance difference on the fluorescent tube direction of principal axis.Like this, along with the maximization of backlight, the axial temperature difference of fluorescent tube, luminance difference have the trend of increase, and these reasons just make backlight generation brightness disproportionation.
To this, even the scheme (for example, with reference to patent documentation 1) of the backlight that the LCD that has proposed a kind of big picture still can throw light on uniform brightness.This scheme is: the electrode side and the bend top-cross of bend pipe fluorescent lamp are replaced configuration, the positive dorsal part of the reflective box of the electrode supply side by inverter being disposed at each fluorescent lamp respectively reduces the tube wall temperature difference on fluorescent tube direction of principal axis and the card direction and reduces the temperature difference on the card.
Patent documentation 1: the spy opens communique 2005-No. 268028
But in the above-mentioned patent documentation 1 described invention, when packing the lamp unit of U-shaped into backlight, if want correctly to arrange in regular turn in containers such as reflective box, then the position of the 2nd lamp electrode must be configured to opposite with the 1st lamp electrode.This work is especially when the backlight of installing about diameter phi 2～5mm, total length is tens of centimetres～several meters magnitudes is used fluorescent tube, the counting work of quantity is installed and holds fluorescent tube and change the work of electrode position and increase, increase the man-hour that the lamp unit is installed, and can cause the problem of dress mistake or damage lamp and so on.
In addition, when the lamp electrode is installed, and the fixing needs welding between maintaining part etc., this also becomes the reason that the activity duration increases.
Summary of the invention
The present invention is based on above-mentioned actual conditions and do, its purpose is to provide backlight arrangement, reaches the liquid crystal indicator that uses this backlight arrangement, described backlight arrangement can prevent that when fluorescent tube is installed dress is wrong or damage fluorescent tube, and can reduce or eliminate the brightness disproportionation because of the backlight that luminance difference caused that produces on the fluorescent tube tube axial direction.
In order to address the above problem, the 1st kind of technological means of the present invention is a kind of backlight arrangement, have abreast configuration and two ends near the electrode accepting unit of accommodating many fluorescent tubes of electrode and the electrode with this fluorescent tube that disposes is abreast arranged, its characteristics are that described electrode accepting unit comprises: thus the electrode by keeping described fluorescent tube is to the electric power transfer member of this fluorescent tube transferring electric power; Thereby and make the conducting member of the electrode conduction of the electrode of this fluorescent tube and other fluorescent tube by the electrode that keeps described fluorescent tube.
The 2nd kind of technological means is in the 1st kind of technological means, and its characteristics are that described electrode accepting unit alternately contains described electric power transfer member and described conducting member for the orientation of described fluorescent tube.
The 3rd kind of technological means the 1st or the 2nd kind of technological means in, its characteristics are, described electrode accepting unit constitutes with a pair of unit, described pair of electrodes accepting unit is installed on the shell with the state of the electrode of accommodating described fluorescent tube two ends respectively, is maintained on the conducting member that the described electrode accepting unit of opposite side had thereby be maintained at described fluorescent tube on the electric power transfer member that the described electrode accepting unit of a side had.
The 4th kind of technological means the 1st or the 2nd kind of technological means in, its characteristics are that described conducting member keeps each electrode of two described fluorescent tubes, thereby forms the discharge circuit of C shape.
The 5th kind of technological means the 1st or the 2nd kind of technological means in, its characteristics are, described electrode accepting unit constitutes with a pair of unit, described pair of electrodes accepting unit is with the first area, and the mutual superimposed state of second area is installed on the shell, wherein said first area is made of the C shape discharge circuit that the conducting member that is had by the described electrode accepting unit that makes a side keeps each electrode of two described fluorescent tubes to form, and described second area is made of the C shape discharge circuit that the conducting member that is had by the described electrode accepting unit that makes opposite side keeps each electrode of other two described fluorescent tubes to form.
The 6th kind of technological means is in any technological means of the 1st to the 5th, and its characteristics are that described electric power transfer member has a plurality of maintaining parts, and provides electric power signal simultaneously to the fluorescent tube that electrode is remained on this maintaining part.
The 7th kind of technological means is in the 6th kind of technological means, and its characteristics are, two described fluorescent tubes that connected by described electric power transfer member are provided the electric power signal of the anti-phase same frequency of phase approximation each other.
The 8th kind of technological means is a kind of backlight arrangement that there is near the electrode accepting unit of accommodating many fluorescent tubes of electrode and the electrode with at least one end in this fluorescent tube that disposes abreast at configuration abreast and two ends that has, its characteristics are, described electrode accepting unit has a plurality of electrical connecting units that the electrode of the electrode of this fluorescent tube and other fluorescent tube are connected in series by the electrode that keeps described fluorescent tube in the orientation of fluorescent tube.
The 9th kind of technological means is in the 8th kind of technological means, and its characteristics are, by each electrode of two described fluorescent tubes keeping being connected with described electrical connecting unit, thus the discharge circuit of formation C shape.
The 10th kind of technological means is in the 8th kind of technological means, and its characteristics are, two described fluorescent tubes that are connected with described electrical connecting unit are provided the electric power signal of the anti-phase same frequency of phase approximation each other.
The 11st kind of technological means is in any technological means of the 1st to the 10th, and its characteristics are that described fluorescent tube constitutes with external electrode fluorescent.
The 12nd kind of technological means is in any technological means of the 1st to the 10th, and its characteristics are, described fluorescent tube has the wire electrode of predetermined length at two ends, and described electrode accepting unit has the retaining member that the wire electrode of clamping described fluorescent tube is kept.
The 13rd kind of technological means is a kind of liquid crystal indicator, and its characteristics are, has backlight arrangement in any technological means of the 1st to the 12nd and the liquid crystal panel that utilizes this backlight arrangement to throw light on.
According to the present invention, backlight arrangement can be provided, reach the liquid crystal indicator that uses this backlight arrangement, described backlight arrangement can prevent that when fluorescent tube is installed dress is wrong or damage fluorescent tube, and can reduce or eliminate the brightness disproportionation because of the backlight that luminance difference caused that produces on the fluorescent tube tube axial direction.
In addition,, thereby do not need welding to wait work, therefore can shorten the installment work time of fluorescent tube because the structure that the wire electrode of fluorescent tube is kept is clamped in utilization.
Description of drawings
Fig. 1 is the cutaway view of the structure example of the liquid crystal indicator of expression use backlight arrangement of the present invention.
Fig. 2 is near the figure of the structure example the electrode portion of expression backlight arrangement of the present invention.
Fig. 3 is the outside drawing of expression as an example of the external electrode fluorescent lamp of other embodiment of fluorescent tube.
Fig. 4 is near the figure of other structure example the electrode portion of expression backlight arrangement of the present invention.
Fig. 5 is the figure of the structure example of the backlight arrangement of expression embodiments of the present invention 1.
Fig. 6 is the figure of the structure example of the backlight arrangement of expression embodiments of the present invention 2.
Fig. 7 is the figure of the structure example of the backlight arrangement of expression embodiments of the present invention 3.
Fig. 8 is the figure of an example that is used to illustrate the assembly method of backlight arrangement of the present invention
Fig. 9 is the figure of the structure example of the backlight arrangement of expression embodiments of the present invention 4.
Label declaration
1 ... liquid crystal indicator, 2 ... backlight arrangement, 3,4 ... framework, 5 ... lamp socket (electrode accepting unit), 6,6 ' ... retaining member, 7,7 ', 11 ... the conducting member, 8 ... fixed component, 9 ... wiring, 10 ... the electric power transfer member, 21 ... fluorescent tube, 21 ' ... external electrode fluorescent lamp, 22 ... reflector plate, 23 ... shell, 24 ... scatter plate, 25 ... diffusion sheet, 26 ... prismatic lens, 27 ... the reflection Polarizer, 28 ... inverter circuit substrate, 29 ... contravariant transformer, 30 ... connecting elements, 101 ... negative circuit, 102 ... on-off circuit, 103 ... oscillating circuit, 211 ... electrode.
The specific embodiment
Below, with reference to accompanying drawing to backlight arrangement of the present invention, and preferred embodiment the describing of liquid crystal indicator of using this backlight arrangement.Also have, the part with identical function is marked identical label, and the repetitive description thereof will be omitted.
Fig. 1 is the cutaway view of the structure example of the liquid crystal indicator of expression use backlight arrangement of the present invention.Among the figure, liquid crystal indicator has liquid crystal panel 1 and backlight arrangement 2 with as its main structure.Liquid crystal panel 1 will be powered to each pixel as predetermined grayscale voltage through vision signal processed video signal according to the clock signal of liquid crystal panel 1, show processing by being implemented in the video of doing scanning successively on the picture, thereby show the video corresponding with vision signal.In addition, backlight arrangement 2 from the opposite side irradiates light of display surface of liquid crystal panel 1, as the light source of this backlight arrangement 2, for example can use cold-cathode fluorescence lamp fluorescent tubes such as (CCFL:Cold Cathode Fluorescent Lamp).
The part of backlight arrangement 2 has: many fluorescent tubes 21 that are used for providing to liquid crystal panel 1 light; The light that is used to each fluorescent tube 21 is sent shines the reflector plate or the reflecting plate (following is representative with the reflector plate) 22 of liquid crystal panel 1 one sides effectively; And be used to accommodate the shell 23 of above-mentioned member.The back side of shell 23 (i.e. the face of an opposite side with the face that fluorescent tube 21 is set) is provided with the inverter circuit substrate 28 (inverter circuit 28) that is used to install inverter circuit.This inverter circuit 28 is provided with contravariant transformer 29 parts such as grade with as the booster circuit to 21 power supplies of each fluorescent tube.The electromagnetic induction effect of utilizing two coils is for example arranged and according to the mutual number of turn of the coil coil form etc. of transformation recently as this contravariant transformer 29.
For example can adopt external excited inverter as inverter circuit 28.Usually, at primary side oscillating circuit is set in the external excited inverter, and be transformed into and the exchanging of the driving frequency same frequency of this oscillating circuit, so by this external excited inverter being used for the driving of above-mentioned coil form contravariant transformer 29, though thereby be coil form, can realize inverter efficiently with the small-sized form that surpasses the piezo-electric type inverter.
The fluorescent tube 21 that constitutes backlight arrangement 2 is a linear, and it is parallel to each other to be configured to its straight line portion.In addition, the shape of reflector plate 22 can be flat shape for example as shown in Figure 1, also can be the concavo-convex shape in cross section.
Have again, also can various optical components be set on liquid crystal indicator according to desired optical property.For example as shown in Figure 1, can have for the light source that constitutes by many fluorescent tubes 21: be used to relax the allocation position of fluorescent tube 21 and the scatter plate 24 of the luminance difference between the position beyond it; Be used for desired occupation mode is provided the diffusion sheet 25 of the light distribution characteristic of the best; The prismatic lens 26 of assembling the light of specific direction; And the polarisation of light ripple that is used to make specific direction see through selectively/reflection incides the reflection Polarizer 27 etc. of degree of polarization of the light of liquid crystal panel 1 with raising.Above-mentioned various optical component (scatter plate 24, diffusion sheet 25, prismatic lens 26, reflection Polarizer 27 etc.) constitutes with tabular or sheet, and is disposed between fluorescent tube 21 and the liquid crystal panel 1.
Fig. 2 is near the figure of the structure example the electrode portion of expression backlight arrangement 2 of the present invention.Among Fig. 2 (A), accommodate near the two end electrodes of 5 expressions with 4 fluorescent tubes 21 with the suitable lamp socket of electrode accepting unit of the present invention, 6 expressions (from last beginning in regular turn) are used to keep the retaining member of the electrode 211 (with reference to X portion) of adjacent two fluorescent tubes 21, the electrode 211 of two fluorescent tubes 21 that 7 expressions are used to keep adjacent is so that the conducting member of conducting between electrode, 8 expressions are fixed in fixed component on the lamp socket 5 with conducting member 7,9 wirings that are connected with retaining member 6 of expression, the 10 9 collection bunchys of representing to connect up carry out the electric power transfer member of electric power transfer.Also have, will be referred to as electric power transfer member 10 by the member that retaining member 6, wiring 9 and electric power transfer member 10 constitute.
And for example shown in the X portion of Fig. 2 (A), the fluorescent tube 21 of present embodiment has the wire electrode 211 of predetermined length at two ends.And retaining member 6 adopts following structure, promptly clamps and keep the wire electrode 211 of fluorescent tube 21.
In the backlight arrangement 2 many of configurations by two ends have electrode 211 4 fluorescent tubes 21, and two end electrodes with 4 fluorescent tubes 21 near two fluorescent tubes that lamp socket 5 constitutes of accommodating.Accommodate to be formed with on the lamp socket 5 of above-mentioned many fluorescent tubes and be used for retaining member 6 is fixed on installing hole 51 on the lamp socket 5, is used near the notch part 52 of accommodating the electrode portion with 4 fluorescent tubes 21 and is used for conducting member 7 is mounted on the installing hole 53 of lamp socket 5.
Retaining member 6 is made of the clamping part of the electrode 211 that grips fluorescent tube 21 and the insertion section of insertion installing hole 51, this insertion section is inserted into installing hole 51, shown in Fig. 2 (A), can utilize welding to wait to make the insertion section of the state after the mutual bending and connect up 9 to be connected.Thus, by retaining member 6 electrode 211 of fluorescent tube 21 is electrically connected with wiring 9.
The a plurality of retaining members 6 that have for electric power transfer member 10 can be made provides power signal to the fluorescent tube 21 that electrode 211 is remained on the retaining member 6 simultaneously.In this case, Figure 6 and Figure 7 can utilize contravariant transformer 29 to carry out two side drives to per two fluorescent tubes in the lamp socket as described later.And, at this moment, can be respectively provide the power signal of the anti-phase same frequency of phase place each other to electric power transfer member 10.
Conducting member 7 by two maintaining parts of the electrode 211 that grips fluorescent tube 21, and can support the support sector of two maintaining parts to constitute in conducting ground, this support sector is fixed from the outside of lamp socket 5 by fixed component by installing hole 53.Thus, make electrode 211 conducting to each other of fluorescent tube 21 by conducting member 7.
In Fig. 2 (A), on each lamp socket 5 at two ends every two adjacent fluorescent tubes are alternately disposed electric power transfer member 10 and conducting member 7 one by one.For example, the lamp socket 5 of an end disposes electric power transfer member 10, conducting member 7 in order from last beginning, and the lamp socket 5 of the other end disposes conducting member 7, electric power transfer member 10 in order.Electric power transfer member 10 is connected with contravariant transformer 29 by connecting elements described later, provides High AC voltage by at least one electrode in 29 pairs of electrodes 211 of contravariant transformer.
Be set at the notch part 52 of lamp socket 5 near the electrode portion of 4 fluorescent tubes 21, be clamped and fastened on retaining member 6 by electrode 211 in order from last beginning, thereby electrode 211 can be electrically connected with contravariant transformer 29 by electric power transfer member 10 with two adjacent fluorescent tubes 21.Be clamped and fastened on conducting member 7 by electrode 211 again, thereby electrode 211 conducts to each other with other two adjacent fluorescent tubes 21.Its result can utilize conducting member 7 to keep each electrodes 211 of two fluorescent tubes 21, forms the discharge circuit of C shape.
Utilization grips to finish in the extremely short time is fixed in retaining member 6 with fluorescent tube 21, waits fixing means to compare with welding, is favourable shortening on the installment work time.In addition, fluorescent tube 21 is separated changing from retaining member 6, all be quite favourable from shortening working hours, promote operation quality.
In addition, lamp socket (electrode accepting unit) 5 is in order to accommodate respectively and the electrode 211 at fluorescent tube 21 both ends of row arrangement and constituting in a pair of mode, and this a pair of lamp socket 5 is installed on the shell with the state of the pair of electrodes 211 of accommodating fluorescent tube 21 respectively.By like this, the state of formation is: be maintained at fluorescent tube 21 on the electric power transfer member 10 of lamp socket 5 of a side and be maintained on the conducting member 7 of lamp socket 5 of opposite side.
Like this,, just can obtain and existing electrode side and the situation same effect of bend side when alternately disposing with the bend pipe fluorescent lamp as long as the fluorescent tube 21 of configuration straight tube for lamp socket 5.That is,,, reduce or eliminate the brightness disproportionation of backlight so can reduce the luminance difference of tube axial direction owing in lamp socket, alternately dispose the high-pressure side (electric power transfer member 10 1 sides) and the low-pressure side (conducting member 7 one sides) of fluorescent tube.
In addition, and for example shown in Fig. 2 (B), also can adopt by two retaining members 6 being connected each other the conducting member 11 of 211 conductings of electrode that make fluorescent tube 21, with the conducting member 7 that replaces Fig. 2 (A) to illustrate.Utilize the conducting member 11 that connects these two retaining members 6, the conducting member 7 that illustrates with Fig. 2 (A) similarly can make electrode 211 conducting to each other that is clamped and fastened on retaining member 6.Also the member that is made of retaining member 6 and conducting member 11 can be referred to as conducting member 11.
Also have, in the above-mentioned a pair of lamp socket 5, with the first area, and second area mutually superimposed state be installed on the shell, wherein said first area is made of the C shape discharge circuit that keeps each electrode of two fluorescent tubes 21 to form by the lamp folder 5 conducting members that had 11 that make a side, and described second area is made of the C shape discharge circuit that keeps each electrode of other two fluorescent tubes 21 to form by the lamp folder 5 conducting members that had 11 that make opposite side.That is, in Fig. 2 (A), it is 21 from last beginning in regular turn that establishing places 4 fluorescent tubes 21 of the lamp socket 5 at two ends
1, 21
2, 21
3, 21
4The time, the first area is for comprising fluorescent tube 21
1With 21
3Each electrode utilize conducting member 11 to keep and the zone of the C shape discharge circuit that forms, second area is for comprising fluorescent tube 21
2With 21
4Each electrode utilize conducting member 11 to keep and the zone of the C shape discharge circuit that forms, by constituting like this, first area and second area are superimposed mutually, the high-pressure side and the low-pressure side of fluorescent tube are come alternate configurations every 1 fluorescent tube ground, so can play following effect, can further improve the ability that the direction (be fluorescent tube orientation) vertical with tube axial direction goes up the brightness disproportionation of fluorescent tube of eliminating.
Here, along with the maximization of liquid crystal panel size in recent years, for high brightness and the high efficiency that ensures liquid crystal indicator, and realize that the life-span is prolonged and the backlight arrangement of weight saving, propose a kind of scheme that on electrodeless glass tube, forms the external electrode fluorescent lamp (EEFL) of outer electrode.This EEFL also is applicable to fluorescent tube 21 of the present invention.
Also have, in view of the purpose of this conducting member 7 or 11, so long as constitute with state that fluorescent tube " is electrically connected " and get final product, this onunit can partly be replaced with electrical connecting unit and be connected as the formation of above-mentioned wiring.Thereby, need not to adopt and only utilize this to connect up to make between the electrode that should connect the structure of conducting fully, can be electrically connected by ballast elements such as capacitor or coil, transformers between two electrodes.Thereby, also can apply in a flexible way in the installation design of the element of being installed according to other purpose.This structure for example also be we can say, is suitable for installing the purpose that is used to detect the damaged of fluorescent tube or detects the circuit of its current value.
In addition, in lamp socket 5, having a plurality of these conducting members 7,11 in the orientation of fluorescent tube is electrical connecting unit, by the electrode that keeps fluorescent tube the electrode of this fluorescent tube and the electrode of other fluorescent tube are connected in series, by making such structure, following effect can be played especially, when promptly on end of fluorescent tube or any end in the other end, needing many wirings as electrical connecting unit, the trouble that the number of elements on this too much substrate is set can be saved.
Fig. 3 is the outside drawing of an example of the external electrode fluorescent lamp of other embodiment of expression fluorescent tube 21, among the figure, and 21 ' expression external electrode fluorescent lamp.In Fig. 3 (A), external electrode fluorescent lamp 21 ' is provided with electrode 211 ' R, 211 ' L for band shape external electrode fluorescent lamp at the both ends of glass tube 212 '.Electrode 211 ' R, the 211 ' L at both ends are driven with the high frequency of counting more than the MHz.
Among Fig. 3 (B), external electrode fluorescent lamp 21 ' is the box-like external electrode fluorescent lamp, is provided with can 213 ' R, 213 ' L at the both ends of glass tube 212 ' with as electrode.The external electrode fluorescent lamp 21 ' of this metal box-like is specially adapted to the big situation of diameter of glass tube 212 '.
Fig. 4 is near the figure of other structure example the electrode portion of expression backlight arrangement 2 of the present invention.This example expression utilizes near the structure the electrode portion under the situation of the external electrode fluorescent lamp 21 ' shown in Fig. 3.At Fig. 4 (A) and (B), lamp socket 5 has retaining member 6 ' and conducting member 7 ', and the shape of these members is different from the shape of retaining member 6 shown in Fig. 2 and conducting member 7 (maintaining part).The shape that is retaining member 6 shown in Fig. 2 and conducting member 7 is the clip shape for the electrode 211 that grips fluorescent tube 21, different therewith is, the shape of retaining member 6 ' shown in this example and conducting member 7 ' is corresponding with the outer electrode of fluorescent tube 21 ' 211 ', becomes the annular that is used for the 211 ' embedding of this outer electrode.Also have, other member be fixed component 8, wiring 9, electric power transfer member 10, and conducting member 11 because identical with shown in Fig. 2, so omit explanation here.
Like this, provide electric power transfer member by being electrically connected the conducting member of (conducting) between the electrode that in lamp socket, alternately is provided for carrying out fluorescent tube and being used for electrode to fluorescent tube from the High AC voltage of contravariant transformer, thereby, just can obtain and existing electrode one side and the situation same effect of bend one side when alternately disposing with the bend pipe fluorescent lamp as long as insert straight tube fluorescent lamp.That is,, therefore can reduce the luminance difference of tube axial direction, and reduce or eliminate the brightness disproportionation of backlight owing in lamp socket, alternately dispose the high-pressure side and the low-pressure side of fluorescent tube.
In addition, in the time of on the lamp socket that 4 fluorescent tubes is arranged on two ends, because of need not to consider the position of electrode as bend pipe fluorescent lamps such as U-shaped, so can not hold the work etc. of fluorescent tube transposing electrode position, it is easy that the work of setting becomes.And when many set fluorescent tubes are connected with inverter circuit substrate, just can as long as the electric power transfer member of fluorescent tube one side is contained on the connecting elements of inverter circuit substrate one side.Therefore, producers etc. can prevent that dress is wrong or damage lamp etc. when carrying out the configuration effort of fluorescent tube, can easily and reliably carry out installment work.
Each embodiment to backlight arrangement describes, described backlight arrangement is by Fig. 2 as the aforementioned or the lamp socket that contains many fluorescent tubes in the many places configuration shown in Figure 4, thereby can prevent that when fluorescent tube is installed dress is wrong or damage fluorescent tube, and can also reduce or eliminate because the back light source brightness inequality that luminance difference caused that the fluorescent tube tube axial direction produces.
(embodiment 1)
Fig. 5 is the figure of the structure example of the backlight arrangement 2 of expression embodiments of the present invention 1.In Fig. 5 (A), 5R represents the lamp socket of a side, 211R represents 4 electrodes of a side of 4 fluorescent tubes 21,9R represents the wiring from two adjacent electrode 211R, the 10R 9R that represents to connect up collects the electric power transfer member that bunchy carries out electric power transfer, 11R represents to make other adjacent two electrode 211R conducting member of conducting to each other, similarly, 5L represents the lamp socket of opposite side, 211L represents 4 electrodes of the opposite side of 4 fluorescent tubes 21,11L represents to make other adjacent two electrode 211L conducting member of conducting to each other, 9L represents the wiring from two adjacent electrode 211L, the 10L 9L that represents to connect up collects the electric power transfer member that bunchy carries out electric power transfer.
In addition, omit the record of the retaining member 6 in the lamp socket.In addition, lamp socket 5R, 5L; Electrode 211R, 211L; Wiring 9R, 9L; Electric power transfer member 10R, 10L; And conducting member 11R, 11L constitute with identical member respectively, these members often with lamp socket 5, electrode 211, wiring 9, electric power transfer member 10, reach conducting member 11 and represent.
In the backlight arrangement 2 the many groups of configuration by two ends have electrode 211 4 fluorescent tubes 21, and two end electrodes with 4 fluorescent tubes 21 near the fluorescent tube group that constitutes of a pair of lamp socket 5 of accommodating.Have, backlight arrangement 2 also comprises again: be used to a pair of inverter circuit substrate 28R, 28L that a plurality of fluorescent tube groups are lighted; And with electric power transfer member 10R, 10L is connected and provide connecting elements 30R, 30L from the High AC voltage of contravariant transformer 29R, 29L on inverter circuit substrate 28R, the 28L to the electrode of the side of electrode 211R, the 211L of two fluorescent tubes that are connected with electric power transfer member 10R, 10L, alternately disposes electric power transfer member 10 and conducting member 11 in the lamp socket 5.
In addition, inverter circuit substrate 28R, 28L, contravariant transformer 29R, 29L and connecting elements 30R, 30L constitutes with identical components respectively, these members often with inverter circuit substrate 28, contravariant transformer 29, and connecting elements 30 be representative.
In Fig. 5 (A), dispose the fluorescent tube group that 3 groups (12 fluorescent tubes 21) constitute with 4 fluorescent tubes 21 and a pair of lamp socket 5 side by side.In addition, inverter circuit substrate 28R, the 28L that constitutes a pair of inverter circuit substrate is arranged at the face with the opposite side of the face that is provided with of a plurality of fluorescent tube groups, is disposed near the two end electrodes of fluorescent tube group. Inverter circuit substrate 28R, 28L install connecting elements 30R, 30L and electric power transfer member 10R, 10L accordingly.
On the inverter circuit substrate 28R of a side, be mounted for the on high-tension side connecting elements 30R of fluorescent tube group, on lamp socket 5R, alternately dispose electric power transfer member 10R that is connected with connecting elements 30R and the conducting member 11R that becomes low-pressure side in regular turn from last beginning.Similarly, on the inverter circuit substrate 28L of opposite side, be mounted for the on high-tension side connecting elements 30L of fluorescent tube group, on lamp socket 5L, alternately be configured as the conducting member 11L of low-pressure side, the electric power transfer member 10L that is connected with connecting elements 30L in regular turn from last beginning.In addition, the high-pressure side of fluorescent tube group is a side that is connected with contravariant transformer 29, and low-pressure side is an electrode side of conducting to each other that makes fluorescent tube 21.
In the present embodiment, every two adjacent fluorescent tubes are in the high-pressure side (side that connects contravariant transformer 29) in the lamp socket 5, and the electrode of the side in two electrodes 211 provides the High AC voltage from contravariant transformer 29, and the electrode grounding of opposite side.Therefore, can carry out one-sided driving with 1 contravariant transformer 29 for per two fluorescent tubes in the lamp socket 5.
By adopting such structure, thereby can obtain and existing electrode side and the situation same effect of bend side when alternately disposing with the bend pipe fluorescent lamp.Promptly shown in Fig. 5 (B),, therefore can reduce the luminance difference of tube axial direction, reduce or eliminate the brightness disproportionation of backlight because per two fluorescent tubes in the lamp socket are alternately disposed high-pressure side and low-pressure side.
In addition, when for a pair of lamp socket 54 fluorescent tubes 21 being set, because of need not to consider the position of electrode as bend pipe fluorescent lamps such as U-shaped, so can not hold the work etc. of fluorescent tube transposing electrode position, it is easy that the work of setting becomes.And when set fluorescent tube group is connected with inverter circuit substrate 28, just can as long as the electric power transfer member 10 of fluorescent tube one side is contained on the connecting elements 30 of inverter circuit substrate one side.Therefore, producers etc. can prevent that dress is wrong or damage lamp etc. when carrying out the configuration effort of fluorescent tube, can easily and reliably carry out installment work.
In addition, under the situation of existing bend pipe fluorescent lamp, owing to make crooked structure,, make picture restricted on increasing so the length of length dimension direction is about about half of the identical straight tube fluorescent lamp of length overall.On the other hand, backlight arrangement 2 of the present invention is because of using straight tube fluorescent lamp, so can satisfy the demand that increases picture.
(embodiment 2)
Fig. 6 is the figure of the structure example of the backlight arrangement 2 of expression embodiments of the present invention 2.Among Fig. 6 (A), backlight arrangement 2 is except the structure of contravariant transformer 29 and connecting elements 30 is different, and remaining structure is identical with embodiment 1.The connecting elements 30 of present embodiment is connected with electric power transfer member 10 and provides High AC voltage from the contravariant transformer on the inverter circuit substrate 28 29 to the electrode of the both sides of the electrode 211 of two fluorescent tubes 21 that are connected with electric power transfer member 10.Contravariant transformer 29 is disposed at the electrode of the both sides of electrode 211 respectively seriatim, can provide High AC voltage to the electrode 211 of both sides.Thereby, can utilize per two fluorescent tubes in 29 pairs of lamp sockets of two contravariant transformers 5 to carry out two side drives.
By adopting such structure, thereby can obtain and existing electrode side and the situation same effect of bend side when alternately disposing with the bend pipe fluorescent lamp.Promptly shown in Fig. 6 (B),, therefore can reduce the luminance difference of tube axial direction, reduce or eliminate the brightness disproportionation of backlight because per two fluorescent tubes in the lamp socket are alternately disposed high-pressure side and low-pressure side.
(embodiment 3)
Fig. 7 is the figure of the structure example of the backlight arrangement 2 of expression embodiments of the present invention 3.Among Fig. 7 (A), backlight arrangement 2 is except the structure of contravariant transformer 29 and connecting elements 30 is different, and remaining structure is identical with embodiment 1.The connecting elements 30 of present embodiment is connected with electric power transfer member 10 and provides High AC voltage from the contravariant transformer on the inverter circuit substrate 28 29 to the electrode of the both sides of the electrode 211 of two fluorescent tubes 21 that are connected with electric power transfer member 10.To 1 contravariant transformer 29 of electrode configuration of the both sides of electrode 211, this contravariant transformer 29 can provide High AC voltage to the electrode 211 of both sides.Therefore, can utilize per two fluorescent tubes in 29 pairs of lamp sockets of 1 contravariant transformer 5 to carry out two side drives.
By adopting such structure, thereby can obtain and existing electrode side and the situation same effect of bend side when alternately disposing with the bend pipe fluorescent lamp.Promptly shown in Fig. 7 (B),, therefore can reduce the luminance difference of tube axial direction, reduce or eliminate the brightness disproportionation of backlight because per two fluorescent tubes in the lamp socket are alternately disposed high-pressure side and low-pressure side.
Fig. 8 is the figure of an example that is used to illustrate the assembly method of backlight arrangement 2 of the present invention.As shown in FIG., inverter circuit substrate 28 is disposed at the outer surface (promptly and be provided with the face of the opposite side of face of fluorescent tube 21) of shell 23.On this inverter circuit substrate 28, dispose the connecting elements 30 that is used to provide from the High AC voltage of contravariant transformer 29 accordingly with electric power transfer member 10.And, be contained in 4 fluorescent tubes in the lamp socket 5, two fluorescent tubes adjacent to upside connect electric power transfer member 10 and connecting elements 30, provide High AC voltage from the contravariant transformer on the inverter circuit substrate 28 29 by at least one electrode in the electrode of 30 pairs of two fluorescent tubes 21 of connecting elements.At this moment, the electrode of other two fluorescent tubes 21 that downside is adjacent is to each other by 11 conductings of conducting member.Therefore, alternately dispose, thereby can reduce the luminance difference of tube axial direction, reduce or eliminate the brightness disproportionation of backlight for per two its high-pressure sides of fluorescent tube and low-pressure side in the lamp socket.
According to the present invention, owing in the fluorescent tube group that constitutes with 4 fluorescent tubes and a pair of lamp socket, alternately dispose the high-pressure side and the low-pressure side of fluorescent tube, therefore the same with existing electrode side with the bend pipe fluorescent lamp with the situation of bend side when alternately disposing, can reduce the luminance difference of tube axial direction, reduce or eliminate the brightness disproportionation of backlight.
In addition, when being arranged on 4 fluorescent tubes on a pair of lamp socket, because of need not to consider the position of electrode as bend pipe fluorescent lamps such as U-shaped, so can not hold the work etc. of fluorescent tube transposing electrode position, it is easy that the work of setting becomes.And when many set fluorescent tubes are connected with inverter circuit substrate, just can as long as the electric power transfer member of fluorescent tube one side is contained on the connecting elements of inverter circuit substrate one side.Therefore, producers etc. can prevent that dress is wrong or damage lamp etc. when carrying out the configuration effort of fluorescent tube, can easily and reliably carry out installment work.
(embodiment 4)
About the embodiments of the present invention of putting down in writing as mentioned above, again can be as shown in Figure 9, for the fluorescent tube unit 21a of two fluorescent tubes that will be connected in series, can utilize with other fluorescent tube unit (21c) to drive with respect to the structure that contravariant transformer is connected in parallel as a unit.By like this, in the scope of the power that contravariant transformer can be exported, can cut down its number of elements as much as possible.
As concrete example, mainly as following, connect.
Shown in Fig. 9 (A), at first, on the inverter circuit substrate 28 of a side, have two contravariant transformer 29R.And, according to recommend driving switch circuit 102 (for example constituting) by the oscillator signal of oscillating circuit 103 output by two or 4 transistors such as FET.Utilize each transistorized sense of current that flows through primary winding of this on-off circuit 102R constantly to change according to frequency of oscillation.So, the electric power that is imported into transformer is transformed into the output voltage after input voltage and step-up ratio N multiply each other, this step-up ratio N is corresponding with the turn ratio of primary winding that constitutes this transformer and secondary coil, so just apply the High AC voltage that can make fluorescent tube produce electric discharge phenomena.
Have again,, have negative circuit 101R for the alternating voltage that above-mentioned two contravariant transformer 29R are exported keeps the opposite phases relation each other.Particularly, can consider the embodiment of various structures etc., for example each secondary coil becomes the relation of opposite winding with respect to the primary winding on the coil rack that is wound in transformer, but be not particularly limited to this, also can adopt following structure, even the GND terminal and the HV Terminal of each secondary coil of the transformer of same structure are opposite, and HV Terminal is connected with fluorescent tube.
By like this, offered the electrode 211R of two other end one sides of the fluorescent tube unit 21a of two fluorescent tubes that are connected in series by conducting member 11 from the High AC voltage that is in the opposite phase relation each other of two contravariant transformer 29R output respectively, thereby had the structure that drives the fluorescent tube that connects into U-shaped.Meanwhile, these two High AC voltages be imported into similarly other two fluorescent tubes fluorescent tube unit 21c and constitute, its result, two fluorescent tube unit 21a that two fluorescent tubes are connected in series and 21c just are connected in parallel mutually with respect to contravariant transformer 29R and are driven.
Equally, the fluorescent tube unit 21b and the 21d that constitute for the mode that is connected in series with two fluorescent tubes, two contravariant transformer 29L, on-off circuit 102L and negative circuit 101L etc. are also arranged, and the same structure of the situation of utilization and described fluorescent tube unit 21a and 21c is connected in parallel and is driven.
And, owing to adopt following structure: i.e. fluorescent tube unit 21a, the 21c that drives by inverter circuit substrate 28R, 28L respectively; And 21b, 21d dispose alternately with each other, therefore promptly use less transformer number of packages, still can keep on the picture left and right directions promptly illuminance distribution for each fluorescent tube length direction, and, when assembling, producers needn't note the configuration direction of fluorescent tube unit etc. always.
Also have,, as described above its structure is set forth, particularly shown in Fig. 9 (B), constitute with primary winding 291R, 291L and secondary coil 292R, 292L respectively about the structure of contravariant transformer.
Also have, in the embodiment that Fig. 9 (A) illustrates, though should constitute the contravariant transformer 29 of each fluorescent tube unit that is connected in parallel with less quantity as far as possible, but, required power is when the rated power of contravariant transformer (for example power output etc.) is not enough when the number of the fluorescent tube of considering to be connected in series and length etc., each contravariant transformer 29 can constitute with two transformers, and shown in Fig. 9 (C), its primary winding is connected in parallel each other with secondary coil each other, thereby by providing required power to each fluorescent tube unit power supply.
In addition, in the described Fig. 8 that illustrates for example as the foundation embodiments of the invention, the structure example of the outer surface (i.e. the face of an opposite side with the face that fluorescent tube 21 is set) that inverter circuit substrate 28 is disposed at shell 23 is shown, but also can adopts following structure: promptly these inverter circuit substrates 28R, L at least one of them or be disposed at the inner surface of shell 23 together.At this moment, each end that lamp socket 5 shown in the example is assembled into fluorescent tube is housed in the inverter circuit substrate 28 that is disposed at inner surface of outer cover by utilizing above-mentioned figure to pass the imperial examinations at the provincial level, thereby can realize the reduced thickness of display element integral body, also can suppress near the brightness disproportionation of the generation above-mentioned inverter circuit substrate of configuration is brought the situation of influence.In addition, at the lamp socket 5 of fluorescent tube 21 that the inverter circuit substrate in the above-mentioned explanation and being used for is connected in series the all-in-one-piece example of structure is set and also can obtains same effect.
Claims (13)
1. backlight arrangement has configuration abreast and two ends near the electrode accepting unit of accommodating many fluorescent tubes of electrode and the electrode with this fluorescent tube that disposes is abreast arranged, it is characterized in that,
Described electrode accepting unit comprises:
Thereby the electrode by keeping described fluorescent tube is to the electric power transfer member of this fluorescent tube transferring electric power; And
Thereby make the conducting member of the electrode conduction of the electrode of this fluorescent tube and other fluorescent tube by the electrode that keeps described fluorescent tube.
2. backlight arrangement as claimed in claim 1 is characterized in that,
Described electrode accepting unit alternately contains described electric power transfer member and described conducting member for the orientation of described fluorescent tube.
3. backlight arrangement as claimed in claim 1 or 2 is characterized in that,
Described electrode accepting unit constitutes with a pair of unit,
Described pair of electrodes accepting unit is installed on the shell with the state of the electrode of accommodating described fluorescent tube two ends respectively, is maintained on the conducting member that the described electrode accepting unit of opposite side had thereby be maintained at described fluorescent tube on the electric power transfer member that the described electrode accepting unit of a side had.
4. backlight arrangement as claimed in claim 1 or 2 is characterized in that,
Described conducting member keeps each electrode of two described fluorescent tubes, thereby forms the discharge circuit of C shape.
5. backlight arrangement as claimed in claim 1 or 2 is characterized in that,
Described electrode accepting unit constitutes with a pair of unit,
Described pair of electrodes accepting unit with the first area, and second area mutually superimposed state be installed on the shell, wherein said first area is made of the C shape discharge circuit that the conducting member that is had by the described electrode accepting unit that makes a side keeps each electrode of two described fluorescent tubes to form, and described second area is made of the C shape discharge circuit that the conducting member that is had by the described electrode accepting unit that makes opposite side keeps each electrode of other two described fluorescent tubes to form.
6. as each described backlight arrangement of claim 1 to 5, it is characterized in that,
Described electric power transfer member has a plurality of maintaining parts, and provides electric power signal simultaneously to the fluorescent tube that electrode is remained on this maintaining part.
7. backlight arrangement as claimed in claim 6 is characterized in that,
Two described fluorescent tubes that connected by described electric power transfer member are provided the electric power signal of the anti-phase same frequency of phase approximation each other.
8. backlight arrangement has configuration abreast and two ends near the electrode accepting unit of accommodating many fluorescent tubes of electrode and the electrode with at least one end in this fluorescent tube that disposes is abreast arranged, it is characterized in that,
Described electrode accepting unit
In the orientation of fluorescent tube, have a plurality of electrical connecting units that the electrode of the electrode of this fluorescent tube and other fluorescent tube are connected in series by the electrode that keeps described fluorescent tube.
9. backlight arrangement as claimed in claim 8 is characterized in that,
By each electrode of two described fluorescent tubes keeping being connected with described electrical connecting unit, thus the discharge circuit of formation C shape.
10. backlight arrangement as claimed in claim 8 is characterized in that,
Two described fluorescent tubes that are connected with described electrical connecting unit are provided the electric power signal of the anti-phase same frequency of phase approximation each other.
11. each the described backlight arrangement as claim 1 to 10 is characterized in that,
Described fluorescent tube constitutes with external electrode fluorescent.
12. each the described backlight arrangement as claim 1 to 10 is characterized in that,
Described fluorescent tube has the wire electrode of predetermined length at two ends,
Described electrode accepting unit has the retaining member that the wire electrode of clamping described fluorescent tube is kept.
13. a liquid crystal indicator is characterized in that,
Have each described backlight arrangement of claim 1 to 12 and the liquid crystal panel that utilizes this backlight arrangement to throw light on.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP248141/2006 | 2006-09-13 | ||
| JP2006248141 | 2006-09-13 | ||
| JP228626/2007 | 2007-09-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101512220A true CN101512220A (en) | 2009-08-19 |
Family
ID=41003493
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007800334104A Pending CN101512220A (en) | 2006-09-13 | 2007-09-10 | Backlight device and liquid crystal display device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101512220A (en) |
-
2007
- 2007-09-10 CN CNA2007800334104A patent/CN101512220A/en active Pending
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Open date: 20090819 |