KR20080050764A - Backlight unit of lcd - Google Patents

Abstract

A backlight unit of an LCD(Liquid Crystal Display) is provided to prevent interference between wires and current leakage generated when wires for supplying external power to electrodes of fluorescent lamps are extended to the backside of a cover bottom and exposed to the outside. A backlight unit of an LCD includes a plurality of fluorescent lamps(124), a lamp PCB(Printed Circuit Board)(134), a cover bottom(150), an inverter unit, and first and second connectors(138a,138b). Lamp sockets(132) for holding the fluorescent lamps are mounted in a row on the lamp PCB. The lamp PCB has a first hole(131). The lamp PCB is mounted in the cover bottom. The cover bottom has a second hole corresponding to the first hole. The inverter unit is located behind the cover bottom and includes an inverter PCB(135) on which inverters(136) for providing driving power to the fluorescent lamps are mounted. The first and second connectors are respectively inserted into the first and second holes and respectively connected with first and second wires(137a,137b) for electrically connecting the lamp PCB and the inverter PCB.

Description

Backlight unit of LCD

1 is an exploded perspective view schematically showing a liquid crystal display device having a conventional direct type backlight lamp.

FIG. 2 is an enlarged view of a part of the backlight unit of FIG. 1, a cover bottom, and a part of an inverter part.

FIG. 3 is a perspective view showing an actual connection of part A of FIG. 2.

4 is an enlarged view of a part of a liquid crystal display backlight unit, a cover bottom, and a part of an inverter unit according to a first embodiment of the present invention.

5 is a cross-sectional view illustrating in more detail the shape of a lamp PCB and an inverter unit in the backlight unit of the liquid crystal display according to the first embodiment of the present invention.

FIG. 6 is a cross-sectional view illustrating a coupling form of the first and second connectors of FIG. 5.

7 is a cross-sectional view illustrating in more detail the shape of a lamp PCB and an inverter unit in the backlight unit of the liquid crystal display according to the second embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

122: reflective sheet 124: fluorescent lamp

131: first hole 132: lamp socket

134: Lamp PCB 135: Inverter PCB

136: inverter 137a, b: first, second wire

138a, b: Socket connector, plug connector

150: cover bottom

The present invention relates to a liquid crystal display device, and more particularly, to a direct-type liquid crystal display device having a plurality of backlight lamps, and a backlight unit including a plurality of fluorescent lamps and an inverter connected thereto.

In general, the image realization principle of the liquid crystal display device is to use optical anisotropy and polarization of the liquid crystal material, the liquid crystal has a thin, long molecular structure, oriented anisotropy in the arrangement, and when placed in the electric field direction of the molecular arrangement depending on the size This change is polarized. The liquid crystal display device is a liquid crystal panel composed of a pair of transparent insulating substrates, each having a liquid crystal layer interposed therebetween and having a field generating electrode, as an essential component. The alignment direction of the molecules is artificially adjusted and various images are displayed using the change in the transmittance of light.

Since the liquid crystal panel does not have its own light emitting element and requires a separate light source, an image having a identifiable brightness is realized by receiving light through a backlight unit provided on the rear surface. According to the arrangement method of the fluorescent lamp included in the backlight unit, a side light type or a liquid crystal panel which refracts the light of the fluorescent lamp disposed at one side edge of the liquid crystal panel with the light guide plate and enters the front of the liquid crystal panel. By arranging a plurality of fluorescent lamps on the back side can be divided into a direct type (direct type) for supplying light directly over the entire liquid crystal panel.

The metering type liquid crystal display device has a merit that it is easy to manufacture by installing a tubular fluorescent lamp on the side of the liquid crystal panel and projecting light from the lamp to the entire liquid crystal panel screen using a transparent light guide plate.

In addition, the direct type liquid crystal display device has a high uniformity of light by arranging a plurality of fluorescent lamps in a row on the lower surface of the diffusion plate and directs the light toward the front side of the liquid crystal panel, which is advantageous to apply to a large liquid crystal display device. .

Here, the backlight unit of the direct type liquid crystal display device does not need a light guide plate because light is directly irradiated to the front surface of the substrate, and a plurality of backlight lamps are available, so that the light utilization rate is high, the handling is simple, and the size of the display surface. Since there is no limitation in this, it is used for the large screen liquid crystal display device of 20 inches or more.

1 is an exploded perspective view schematically showing a liquid crystal display device having a conventional direct type backlight lamp.

As illustrated, the liquid crystal panel 10, the backlight unit 20, the support main 30, the top case 40, the cover bottom 50, the inverter unit 70, and the cover shield ( 80).

The liquid crystal panel 10 is configured to include a liquid crystal layer spaced apart a predetermined distance, and injected between the upper and lower substrates facing each other. Among them, a thin film transistor, which is a switching element, is positioned on a lower substrate, and a color filter is positioned on an upper substrate, thereby displaying an image by turning on / off driving of the thin film transistor. In addition, the liquid crystal panel 10 is connected to a gate and a data printed circuit board 15 for supplying a scan signal and an image signal to the liquid crystal panel 10.

The backlight unit 20 positioned at the rear of the liquid crystal panel 10 and supplying light uses a direct type. A plurality of fluorescent lamps 24 are arranged in parallel as a light source, and the fluorescent lamp 24 The reflective sheet 22 is positioned at the lower side, and the support side 30 is coupled to the cover bottom 50 at both side ends thereof, and a plurality of optical sheets 26 are stacked and positioned at the upper side thereof.

More specifically, both side ends of the fluorescent lamp 24 is fitted to the lamp holder 32, the lamp holder 32 is inserted into the opening of the support side 30, the support side 30 is the cover bottom 50 ) And both side ends of the

In addition, although not shown, the fluorescent lamp 24 is connected to a wire (not shown) connected to an external power source at one end, and the wire extends to the back of the cover bottom 50, and at one end a socket connector (not shown). C) is connected, and a socket connector (not shown) is connected to the plug connector 38b of the inverter unit 70.

The liquid crystal panel 10 and the backlight unit 20 are seated on the support main 30, and the support main 30 prevents and supports the flow of the liquid crystal panel 10 and the backlight unit 20.

The top case 40 covers the edge of the liquid crystal panel 10 and the side surface of the support main 30 to support and protect the edge of the liquid crystal panel 10 and the side of the support main 30.

The cover bottom 50 covers the lower part of the support main 30 to protect the lower part of the liquid crystal display device described above. The cover bottom 50 is fastened through the support main 30, the top case 40, and a fastening means (not shown) to be modularized.

In addition, an inverter unit 70 for supplying power to the fluorescent lamp 24 is located under the cover bottom 50, and the inverter unit 70 connects a plurality of inverters 36 to the fluorescent lamp 24. An in plug connector 38b and an inverter PCB 35 mounting the plug connector 38b.

The inverter unit 70 is covered by the cover shield (80). Accordingly, the cover bottom 50 and the cover shield 80 surrounds the inverter unit 70 to protect the inverter unit 70 from external shock, and additionally, the cover bottom 50 and the cover shield 80 ) Is made of a metal material to function to shield the electromagnetic waves generated from the inverter unit 70.

As described above, the inverter unit 70 includes a plurality of inverters 36, which may be equal to or less than the number of lamps depending on the type and design intention of the fluorescent lamp 24. The inverter 36 is mounted on the inverter PCB 35 in the direction of the cover shield 80 (ie, back), and the inverter PCB 35 is coupled with the cover shield 80 by the same fastening means.

The inverter unit 70 converts power supplied from an external power supply unit and supplies the converted power to the lamp 24.

FIG. 2 is an enlarged view of a part of the backlight unit of FIG. 1, a cover bottom, and a part of an inverter part.

As shown, the plurality of fluorescent lamps 24 are seated on the back of the reflective sheet, the high-voltage AC waveform is applied to the electrode through the wire 37 connected to the electrode configured at one end to emit light, in the drawing An example of a high-low method in which a ground portion is formed at one end of the fluorescent lamp 24 is illustrated.

In this high-low manner, at least two fluorescent lamps 24 are provided in pairs, one end of which is fitted to the lamp holder 32 and is electrically connected to the inverter unit 70 through a wire 37. Is connected.

The lamp holder 32 is inserted to correspond to the opening of the support side 30 of FIG. 1, and the support side 30 of FIG. 1 is coupled to the cover bottom 50. According to this structure, the support side (30 in FIG. 1) and the lamp holder 32 support the fluorescent lamp 24 from external shock.

The lamp holder 32 is formed of a rubber material for insulating and buffering functions.

In addition, the wire 37 extends to the rear surface of the cover bottom 50, and a socket connector 38a is connected to one end thereof.

In order to drive the fluorescent lamp 24, since a high voltage AC is required, the inverter 70 for converting a DC voltage into a high voltage AC is an essential component.

Accordingly, since the inverter 70 is mounted separately from the inverter PCB 35, and the inverter 70 generates a lot of heat, in general, the designer may design the outside of the modular liquid crystal display, in particular, the cover bottom 50. It will be mounted on the back.

On the inverter PCB 35, a plug connector 38b for connecting with the socket connector 38a is configured, and the two are electrically connected to the fluorescent lamp 24 through the connection.

However, as described above, since the inverter PCB 35 is mounted on the rear surface of the cover bottom 50, the socket connector 38a connected to one end of the wire 37 extending from the fluorescent lamp 24, and the inverter When the plug connectors 38b formed on the PCB 35 are connected to each other, as shown in FIG. 2, the wires 37 are exposed at the side ends and the back of the cover bottom 50.

Therefore, the exposed wires 37 may also come into contact with each other, which may cause interference between the wires 37 or leakage of current due to the high voltage of the AC waveform flowing through the respective wires 37.

This causes a problem that the light emission of the fluorescent lamp 24 is not uniform.

3 is an actual view showing the actual connection of part A of FIG. 2, showing the fluorescent lamp 24, the wire 37, and the socket connector 38a.

As shown, in order to connect the fluorescent lamp 24 and the wire 37 to each other, the fluorescent lamp 24 and the wire 37 must be soldered. This is disadvantageous for automation and has a disadvantage in that the process time is long, and the production cost is increased by using a large amount of the wire 37 over a specific length.

The present invention has been made to solve the above-described problems, the wires connecting the electrode of the fluorescent lamp and the external power source is exposed to the back of the cover bottom extending the exposure and problems such as leakage of current caused in advance It is a 1st object to prevent.

In addition, the second object is to shorten the process time by eliminating the soldering process for connecting the fluorescent lamp and the wire to each other.

In order to achieve the above object, a backlight unit of a liquid crystal display device according to an embodiment of the present invention, the liquid crystal display device comprising a liquid crystal panel and a modular device thereof, comprising: a plurality of fluorescent lamps; A lamp PCB in which the lamp sockets into which the fluorescent lamps are fitted are mounted in a line, and a first hole is formed; A cover bottom in which the lamp PCB is seated inward and a second hole is formed at a position corresponding to the first hole; An inverter unit provided on a rear surface of the cover bottom and including an inverter PCB on which an inverter for supplying driving power of the fluorescent lamp is mounted; And first and second connectors inserted into the first and second holes, respectively, into which first and second wires electrically connect the lamp PCB and the inverter PCB.

The lamp PCB may further include an insulation part formed in the cover bottom direction.

The first wire is characterized in that one end is bonded on the lamp PCB, the other end is inserted into the first connector.

The second wire is characterized in that one end is connected to the second connector, the other end is connected to the socket connector.

The inverter unit may include an inverter for generating driving power of the fluorescent lamp, and a plug connector connected to the socket connector.

The lamp PCB is characterized in that the wiring for electrically connecting the lamp socket and the wire is further formed.

The upper portion of the first connector and the lower portion of the second connector is characterized in that the engaging jaw of a predetermined size is formed in the direction of engaging each end.

The lamp socket may be integrated with the first connector.

The lamp socket may be made of the same material as the first and second connectors.

The lamp socket and the first and second connectors are made of plastic.

Hereinafter, a backlight unit of a liquid crystal display according to an exemplary embodiment of the present invention will be described with reference to the accompanying drawings.

4 is an enlarged view of a part of a liquid crystal display backlight unit, a cover bottom, and a part of an inverter unit according to a first embodiment of the present invention.

As shown, the plurality of fluorescent lamps 124 are mounted on the reflective sheet 122, and the AC waveform high voltage is applied to the electrodes through the first and second wires 137a and b connected to the electrodes formed at one end thereof. It is a structure that emits light, and in the figure shows an example of a high-low (high-low) method, the ground portion is configured at one end of the fluorescent lamp 124. Also, the present invention may be applied to a high-high method in which a high voltage is alternately applied at one end, and is not limited to a specific driving method of the fluorescent lamp 124.

In order to stably mount the fluorescent lamp 124 on the cover bottom 150, one end of the fluorescent lamp 124 is fitted to the lamp socket 132 on the lamp PCB 134 provided separately.

A plurality of lamp sockets 132 are mounted on the lamp PCB 134 in a row, and preferably made of a plastic material in order to insulate and buffer the fluorescent lamp and to support the fluorescent lamp.

As described above, the lamp PCB 134 has a plurality of lamp sockets 132 into which the fluorescent lamps 124 are fitted, mounted in a line, and directly connected to the inverter unit 170 at the shortest distance within the cover bottom. It is fixed to the side through the fastening means.

The lamp socket 132 includes an electrode portion therein, which is electrically connected to the first wire 137a by wiring on the lamp PCB 134. One end of the first wire 137a is bonded to the lamp PCB 134, and the other end thereof is provided with a first connector (not shown), which is a first hole 131 formed in the lamp PCB 134. Is inserted into

Although not shown, a second wire 137b having one end connected to a second connector (not shown) and the other end connected to a plug connector 138b is formed on the rear surface of the cover bottom 150. It is inserted into two holes (not shown) and connected to the first connector (not shown). That is, the first and second wires 137a and b are electrically connected.

Shapes of the first and second connectors will be described below in detail with reference to FIG. 5.

In addition, as described above, since the high voltage of the AC waveform is required to drive the fluorescent lamp 124, the inverter unit 170 for converting the DC waveform voltage into the high voltage AC voltage is an essential component.

The inverter unit 170 includes at least one or more inverters 136 according to the driving method, and since the inverter 136 generates a lot of heat, such an inverter 136 is connected to the inverter PCB 135 which is a separate circuit board. It is mounted and provided outside the modular liquid crystal display device.

As shown in the figure, the cover bottom 150 may be fastened to the cover bottom 150 such that the direction in which the inverter 136 is mounted in the inverter PCB 135 faces downward.

Accordingly, the first wire 137a connected to the lamp socket 132 of the lamp PCB 134 is connected to the second wire 137b through the first and second connectors (not shown), and the second wire 137b. Is connected to the socket connector 138a provided at the end of the cable) and the plug connector 138b mounted on the inverter PCB 134 so that the fluorescent lamp 124 receives the driving voltage generated by the inverter 136. .

In the first embodiment of the present invention having such a structure, the fluorescent lamp and the inverter unit are electrically connected with the shortest distance.

Hereinafter, the backlight unit of the liquid crystal display according to the first embodiment of the present invention will be described with reference to the drawings.

5 is a cross-sectional view illustrating in more detail the shape of a lamp PCB and an inverter unit in the backlight unit of the liquid crystal display according to the first embodiment of the present invention.

As shown in the figure, the backlight unit of the liquid crystal display according to the first embodiment of the present invention includes a lamp PCB 134 inside the cover bottom 150 and an inverter PCB 135 on the rear side thereof. The lamp PCB 134 and the inverter PCB 135 each include a fluorescent lamp 124 and an inverter 136.

More specifically, the lamp PCB 134 includes a substrate portion 134a on which the lamp socket 132 on which the fluorescent lamp 124 is mounted is mounted, and an insulating portion shielding leakage current generated from the inverter 170. 134b). The insulator 134b may be omitted or may be formed on the cover bottom 150 or the inverter PCB 135 instead of the lamp PCB 134. It is not limited.

In addition, the lamp PCB 134 is formed with a first hole 131 into which the first connector 160a is inserted, and the cover bottom 150 corresponds to the first hole 131 formed in the lamp PCB 134. The second hole 151 is formed at the position where the second connector 160b is inserted.

The first and second connectors 160a and b have the first and second wires 137a and b fitted therein, and more effectively shield the leakage current of the first and second wires 137a and b. It is preferable that the plastic material for.

The first and second wires 137a and b will be described in more detail. One end of the first wire 137a is bonded to the lamp PCB 134 and the portion of the first wire 137a is bonded. The silver is electrically connected to an internal electrode of the lamp socket 132 through a wiring (not shown) on the lamp PCB 134. In addition, the other end of the first wire 137a is inserted into the first connector 160a.

In addition, one end of the second wire 137b is inserted into the first connector 160b and the other end is connected to the socket connector 138a.

In addition, a plug connector 138b mounted on the inverter unit 170 is provided as a rear surface of the cover bottom 150 in a form as close as possible to the second hole 151 of the cover bottom 150, and the socket connector 138a. ) And the plug connector 138b are connected.

As such a structure, the first connector 160a and the second connector 160b are coupled to each other, such that the lamp PCB 132 and the inverter PCB 135 are electrically connected at the shortest distance.

Hereinafter, a form in which the first and second connectors 160a and b are coupled will be described with reference to FIG. 6.

FIG. 6 is a cross-sectional view illustrating a form in which the first and second connectors 160a and b of FIG. 5 are coupled. Referring to the drawings, the first and second connectors 160a and b may be hooked to each other. A locking jaw H of a predetermined size is formed in the direction in which the lower end protrudes, and inner passages 162a and 162b into which the first and second wires 137a and b are fitted, respectively. ) Is formed.

The first wire 137a is fitted into the inner passage 162a of the first connector 160a, and the first connector 160a is inserted downward in the first hole 131 of the lamp PCB 134.

In addition, the second wire 137b is inserted into the inner passage 162b of the second connector 160b, and the second connector 160b is inserted upward in the second hole 151 of the lamp PCB 160b. do.

In addition, the protruding end of the second connector 160b is inserted to the first hole 131 so that the locking jaws are engaged with each other, and the inner passages 162a and b of the connector are connected to each other, thereby inserting the first connector. The second wires 137a and b are connected to each other.

Here, the connection form of the first and second connectors shown in FIG. 6 is not only the first embodiment, but also the second embodiment to be described below, except that the lamp socket is only integrated with the first connector. Is applied.

Hereinafter, a second embodiment of another form of the lampholder and the second connector will be presented.

7 is a cross-sectional view illustrating in more detail the shape of a lamp PCB and an inverter unit in the backlight unit of the liquid crystal display according to the second embodiment of the present invention.

As illustrated, the backlight unit of the liquid crystal display according to the exemplary embodiment of the present invention is fastened to the lamp PCB 234 on the inside of the cover bottom 250 and the inverter PCB 235 on the back, and the lamp PCB 234 and inverter PCB 235 include fluorescent lamp 224 and inverter 236, respectively.

More specifically, the lamp PCB 234 includes a substrate portion 234a on which the lamp socket 232 to which the fluorescent lamp 224 is fitted is mounted, and an insulating portion shielding leakage current generated from the inverter 270. 234b, and the insulator 234b may be omitted depending on a designer's intention, or may be formed in the cover bottom 250 or the inverter PCB 235 instead of the lamp PCB 234. The position where it is arranged is not limited.

Here, the lamp socket 232 is a socket-integrated connector 232 integral with the first connector (160a in FIG. 5) of the first embodiment, except that the inner passage (162 in FIG. 5) is replaced with the internal electrode 233. There is a difference.

A first hole 231 is formed in the lamp PCB 234, and a second hole 251 is formed in the cover bottom 250 at a position corresponding to the first hole 231 formed in the lamp PCB 234. And a connector 260 is inserted.

The connector 260 is preferably made of a plastic material to allow the wire 237 to pass through and shield the leakage current of the wire 237 more effectively.

In more detail with respect to the wire 237, one end of the wire 237 is inserted into the connector 260, the other end is connected to the socket connector 238a.

In addition, a plug connector 238b mounted on the inverter unit 270 is provided as a rear surface of the cover bottom 250 in a form as close as possible to the second hole 251 of the cover bottom 250, and the socket connector 238a. ) And the plug connector 238b are connected.

As such a structure, the socket integrated connector 232 and the connector 260 are coupled to each other so that the internal electrode of the socket integrated connector 232 and the wire 237 fitted to the connector 260 are electrically connected to each other. That is, the lamp PCB 234 and the inverter PCB 235 are electrically connected with the shortest distance.

Although described above with reference to a preferred embodiment of the present invention, those skilled in the art various modifications and variations of the present invention without departing from the spirit and scope of the present invention described in the claims below I can understand that you can.

Accordingly, in the backlight unit of the liquid crystal display device according to the first and second embodiments of the present invention, wires connecting the electrodes of the fluorescent lamp and the external power source are inserted into the first and second holes of the lamp PCB and the cover bottom, By connecting the fluorescent lamp and the inverter in the shortest distance through the first and second connectors, problems such as interference between wires and leakage of current can be prevented in advance.

In addition, a process of soldering each of the fluorescent lamps and the wires to each other is omitted, thereby shortening the process time.

Claims (10)

In the liquid crystal display device comprising a liquid crystal panel and a modular device thereof, A plurality of fluorescent lamps; A lamp PCB in which the lamp sockets into which the fluorescent lamps are fitted are mounted in a line, and a first hole is formed; A cover bottom in which the lamp PCB is seated inward and a second hole is formed at a position corresponding to the first hole; An inverter unit provided on a rear surface of the cover bottom and including an inverter PCB on which an inverter for supplying driving power of the fluorescent lamp is mounted; First and second connectors inserted into the first and second holes, respectively, into which first and second wires electrically connecting the lamp PCB and the inverter PCB are inserted; The backlight unit of the liquid crystal display device comprising a. The method of claim 1, The lamp PCB further includes an insulating part formed in the cover bottom direction. The method of claim 1, One end of the first wire is bonded to the lamp PCB, and the other end of the first wire is inserted into the first connector. The method of claim 1, And one end of the second wire is connected to the second connector and the other end of the second wire is connected to the socket connector. The method of claim 4, wherein The inverter unit may include an inverter for generating driving power of the fluorescent lamp, and a plug connector connected to the socket connector; The backlight unit of the liquid crystal display device comprising a. The method of claim 1, The lamp PCB is a backlight unit of the liquid crystal display device, characterized in that the wiring for electrically connecting the lamp socket and the wire is further formed. The method of claim 1, The upper and upper portions of the first connector and the lower portion of the second connector are formed in the locking step of a predetermined size in the direction of engaging each end of the backlight unit of the liquid crystal display device. The method of claim 1, And said lamp socket is integrated with said first connector. The method of claim 1, And the lamp socket is made of the same material as the first and second connectors. The method of claim 9, And the lamp socket and the first and second connectors are made of plastic.

Images