KR20070074168A - Power supply unit, back light assembly having the power supply unit and display device having the same - Google Patents

Abstract

A power supply unit and a backlight assembly and a display device having the same are provided to separate a power supply substrate from a lamp holder, thereby easily performing the assembly and rework processes. Plural openings are formed at a connection member(20). Lamp holders include a body(31) inserted into the opening. A power supply member is fixed to the body and supplies the driving power to lamps. Connectors(41) are formed at a power supply substrate(40) so that the body exposed through the opening is detachably combined. The body includes a lamp guide member for guiding an end of the lamp. A holding member is fixed to the connector. A fixing hook is formed at the holding member so that the separation of the lamp holder is prevented. The connector includes the first protrusion member protruded from the power supply substrate and fixed to a fixing groove of the holding member. The second protrusion member is protruded from the circumference of the first protrusion member and covers the outside surface of the holding member.

Description

POWER SUPPLY UNIT, BACK LIGHT ASSEMBLY HAVING THE POWER SUPPLY UNIT AND DISPLAY DEVICE HAVING THE SAME}

1 is a perspective view of a power supply unit according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the power supply unit shown in FIG. 1.

3 is a perspective view of the lamp holder shown in FIG.

4 is a perspective view of a portion of the power supply substrate shown in FIG. 2.

5A and 5B are sectional views taken along the line II ′ of the power supply unit shown in FIG. 2.

6 is a perspective view of a backlight assembly according to an embodiment of the present invention.

FIG. 7 is an exploded perspective view of the backlight assembly shown in FIG. 6.

FIG. 8 is a cross-sectional view of the backlight assembly illustrated in FIG. 6 taken along the line II-II ′.

9 is an exploded perspective view of a display device according to an exemplary embodiment.

FIG. 10 is a cross-sectional view of the display device illustrated in FIG. 9 taken along line III-III ′.

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

20: connecting member 23: opening

30 lamp holder 31 body

32: lamp guide portion 33: power supply member

35 holding part 36 fixed hook

40: power supply board 41: connector

43: first protrusion 45: second protrusion

The present invention relates to a power supply unit, a backlight assembly having the same, and a display device. More particularly, the present invention relates to a power supply unit having improved assembly property and easy rework of a power supply substrate, a backlight assembly, and a display device having the same.

In general, the liquid crystal display uses a backlight disposed on the back of the display panel as an external light source, and the backlight assembly employed in the conventional display device includes a direct downward type back light assembly and an edge according to the arrangement of the light source. It is divided into an edge type back light assembly.

In the direct type backlight assembly, a plurality of light sources are disposed under the display panel. In the edge type backlight assembly, a light source is disposed on a side of the light guide plate to provide light to the display panel.

As a light source used in the direct backlight assembly, a cold cathode fluorescent lamp (CCFL) is representative. It further includes a socket.

In recent years, the size of the display panel has increased in size. Accordingly, in order to provide uniform and high brightness light to the large display panel, a backlight assembly using one flat fluorescent lamp as a light source or a plurality of fluorescent lamps connected in parallel as a light source has been developed. In addition, in order to easily assemble the plurality of lamps, a backlight assembly has been developed in which an electrode portion of the lamps and a lamp socket are fitted.

However, while the lamp socket can firmly fix the lamps on the bottom surface of the container, the number of the lamp sockets is also increased in proportion to the number of the lamps. Furthermore, as described above, as the size of the display panel is increased, the number of the lamps employed in the backlight assembly is also increasing. As a result, the number of the lamp sockets mounted in the display device is also increasing. When the number of lamp sockets is increased, the weight of the display device is increased and the assembly time is increased.

Further, in the assembly of a conventional backlight assembly, in order to provide a driving voltage to the lamps, soldering a plurality of power supply voltage supply wires connected to the plurality of sockets and an inverter, or a plurality of the sockets to a printed circuit board Soldered.

For this reason, the assembly of the backlight assembly takes a long time, and the lamp is frequently damaged during the soldering process.

In addition, as the operating time of the backlight assembly becomes longer, there is a problem in that the soldering part is frequently disconnected.

Accordingly, the technical problem of the present invention is to solve such a conventional problem, and an object of the present invention is that the lamp holder is detachably coupled to the power supply board, so that the assembly performance is improved and the rework is easy. To provide.

Another object of the present invention is to provide a backlight assembly comprising the above-described power supply unit.

Another object of the present invention is to provide a display device including the power supply unit.

In order to realize the above object of the present invention, a power supply unit according to an embodiment includes a connection member, lamp holders, and a power supply substrate. A plurality of openings are formed in the connection member. The lamp holder includes a body and a power applying member. The body is inserted into the opening, and the power applying member is fixed to the body to apply a lamp driving voltage to the lamp. The power supply substrate is provided with connectors to which the body exposed through the opening is detachably coupled.

In order to realize the above object of the present invention, a backlight assembly according to an embodiment includes a container, lamp holders, a power supply substrate, and lamps. The storage container includes a bottom plate and a side wall. A plurality of openings are formed in the bottom plate, and the side wall is disposed at the periphery of the bottom plate. The lamp holders include a body and a power applying member. The body is inserted into the opening and exposed to the rear surface of the bottom plate, and the power applying member is fixed to the body. The power supply board is provided with a plurality of connectors into which the body exposed to the rear surface is inserted. The lamps are respectively fixed to the lamp holders.

In order to achieve the above object of the present invention, a display device according to an embodiment includes a storage container, a power supply unit, lamps, and a display panel. The power supply unit includes lampholders and a power supply substrate. The lamp holders are respectively inserted into a plurality of openings formed in the bottom plate of the storage container. The power supply board is provided with connectors into which the lamp holders exposed to the rear surface of the bottom plate are inserted. The lamps are respectively fixed to the lamp holders. The display panel displays an image based on the light emitted from the lamps.

According to such a power supply unit, a backlight assembly and a display device having the same, a process of fixing the lamp holder to the bottom plate of the storage container and a soldering process between the lamp holder and the power supply substrate are omitted, and the rework of the power supply substrate is Become easy.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Power supply unit

1 is a perspective view of a power supply unit according to an embodiment of the present invention. FIG. 2 is an exploded perspective view of the power supply unit shown in FIG. 1.

1 and 2, the power supply unit 50 includes a connection member 20, lamp holders 30, and a power supply substrate 40.

The connecting member 20 has a plate shape extending in one direction. The connection member 20 is preferably made of an electrically insulating material. A plurality of openings 23 are formed in the connection member 20. The openings 23 are arranged in a line along the longitudinal direction of the connecting member 20. The connection member 20 is formed with female threads for fastening the connection member 20 and the power supply substrate 40 to be described later.

3 is a perspective view of the lamp holder shown in FIG.

2 and 3, the lamp holder 30 fixes the lamp on the fixing member. The lamp holder 30 is electrically connected to the power supply substrate 40 to be described later to apply a lamp driving voltage to the lamp. The lamp holder 30 includes a body 31 and a power applying member 33.

The body 31 is inserted into and fixed to the opening 23. The body 31 is preferably made of a material having excellent insulation. The body 31 includes a lamp guide part 32 and a holding part 35. As the body 31 is inserted into the opening 23 formed in the connecting member 20, the lamp guide part 32 protrudes to the upper surface of the connecting member 20, and the holding part 35 is provided. Protrudes into the rear surface of the connection member 20.

The lamp guide part 32 guides the end of the lamp. In this embodiment, the lamp guide portion 32 is a guide groove formed corresponding to the shape of the lamp. The holding part 35 is coupled to the power supply substrate 40 to be described later in a manner that can be mounted and detached. In order for the holding part 35 to have an appropriate elasticity, the holding part 35 is provided with a fastening groove facing the lamp guide part 32. On the other hand, the fixing hook 36 is formed in the region adjacent to the lamp guide portion 32 of the outer surface of the holding portion 35.

The power applying member 33 is made of a conductive material. One end of the power applying member 33 protrudes to the vicinity of the lamp guide part 32, and the other end 38 protrudes to an inner side surface of the fastening groove. Here, the one end is defined as a connecting portion, and the other end 38 is defined as a terminal portion 38. The connection part has a ring shape in which one side is opened to easily fix the electrode part of the lamp.

4 is a perspective view of a portion of the power supply substrate shown in FIG. 2.

2 to 4, the power supply substrate 40 outputs the lamp driving voltage to the power applying member 33. The power supply substrate 40 is disposed on the rear surface of the connection member 20. The power supply substrate 40 has a width larger than the width of the connection member 20 and has a length similar to the length of the connection member 20. Female screw portions corresponding to the female screw portions formed in the connection member 20 are formed in the power supply substrate 40.

The power supply substrate 40 includes an insulating substrate, a power supply element (not shown), and a connector 41. A conductive pattern insulated from the outside is formed on the insulating substrate. The power supply element is disposed on the rear surface of the power supply substrate 40. The power supply device generates the lamp driving voltage and applies it to the conductive pattern. The power supply element 163 is an inverter for changing and outputting the source power voltage supplied from the outside to the lamp driving voltage. The inverter changes the AC power supplied from the outside into the DC power, boosts or decompresses the changed DC power to the level required for the lamp, and changes the boosted or reduced DC power back into the AC power.

In another embodiment, the power supply substrate 40 may be a balance board outputting from the inverter to uniform the lamp driving voltage provided to the plurality of lamps.

5A and 5B are sectional views taken along the line II ′ of the power supply unit shown in FIG. 2. Specifically, FIG. 5A illustrates a state in which lamp holders and a power supply substrate are separated, and FIG. 5B illustrates a state in which lamp holders and a power supply substrate are coupled.

2 to 5B, a plurality of connectors 41 are formed on the opposite surface of the insulating substrate facing the connection member 20 to correspond to the lamp holders 30. The connector 41 is integrally formed on the insulating substrate. In another embodiment, the connector 41 may be fastened to the insulating substrate.

The holding part 35 exposed through the opening 23 is coupled to the connector 41 in a detachable manner. In detail, the connector 41 includes a first protrusion 43 and a second protrusion 45. The first protrusion 43 protrudes from the insulating substrate to have a first height. The second protrusion 45 protrudes from the periphery of the first protrusion 43 to have a second height smaller than the first height. The first protrusion 43 is inserted into the fastening groove 37 formed in the holding part 35. On the other hand, the second protrusion 45 covers a part of the outer surface of the holding part 35.

In this case, a connection terminal 44 electrically connected to the conductive pattern of the insulating substrate is formed on the side surface of the first protrusion 43. As the holding part 35 is coupled to the connector 41, the terminal part 38 protruding to the inner side of the fastening groove 37 is in contact with the connection terminal 44. Accordingly, the lamp driving voltage output from the power supply element is applied to the power applying member 33.

On the other hand, the fixed hook 36, as shown in Figure 5b, is caught on the back of the connecting member 20, accordingly, the fixed hook 36 is the body 31 is the opening 23 This prevents the deviating in the direction opposite to the direction of insertion.

Backlight assembly

6 is a perspective view of a backlight assembly according to an embodiment of the present invention. FIG. 7 is an exploded perspective view of the backlight assembly shown in FIG. 6.

6 and 7, the backlight assembly 100 includes a storage container 110, lamp holders 130, a power supply substrate 140, and lamps 155.

The storage container 110 includes a bottom plate 111 and first to fourth sidewalls 113, 115, 117, and 119. The bottom plate 111 has a substantially rectangular shape, and the first to fourth sidewalls 113, 115, 117, and 119 are disposed at the periphery of the bottom plate 111. The first and second sidewalls 113 and 115 are disposed to face each other, the third and fourth sidewalls 117 and 119 are opposite to each other, and the first and second sidewalls 113 and 115 are opposite to each other. Connect each of them. The bottom plate 111 adjacent to the first sidewall 113 and the bottom plate 111 adjacent to the second sidewall 115 respectively have a plurality of openings along the first sidewall 113 and the second sidewall 115. 123 are formed.

The lamp holders 130 include a body 131 and a power applying member 133. The lamp holder is substantially the same as the lamp holder 30 shown in Figs. 1 to 5b. The body 131 includes a lamp guide part 132 and a holding part 135. The holding part 135 is inserted into the opening 123 from the inner side of the storage container 110.

At this time, the fixing hook 136 formed on the holding part 135 is pressed to be in close contact with the body 131, and when the holding part 135 passes through the opening 123, the fixing hook 136 is It recovers to its original state and is caught by the back of the bottom plate 111. Accordingly, the body 131 is fixed to the bottom plate 111, the lamp guide portion 132 protrudes into the interior of the storage container 110, the holding portion 135 is the bottom plate ( 111 is projected to the back side.

FIG. 8 is a cross-sectional view of the backlight assembly illustrated in FIG. 6 taken along the line II-II ′.

6 to 8, the power supply substrate 140 is substantially the same as the power supply substrate 40 illustrated in FIGS. 1 to 5B. The power supply board 140 is disposed on the bottom surface of the bottom plate 111, and the connector 141 formed on the power supply board 140 is coupled to the body 131.

In detail, the first protrusion 143 of the connector 141 is inserted into the fastening groove formed in the holding part 135, and the second protrusion 145 of the connector 141 is formed of the holding part 135. A portion of an outer side surface of the holding part 135 is covered from an end portion. That is, an end portion of the holding part 135 is inserted between the first protrusion 143 and the second protrusion 145. In this case, the second protrusion 145 is preferably located below the fixing hook 136. The connection terminal 144 formed on the first protrusion 143 is electrically connected to the power applying member 133 protruding to the inner side surface of the fastening groove.

The lamps 155 are fixed to the lamp holder 130. An end of the lamp 155 is disposed in the lamp guide part 132. The electrode unit 157 formed at the end of the lamp 155 is fixed to the annular power supply member 133 protruding to the vicinity of the lamp guide 132.

The backlight assembly 100 further includes a reflector plate 151. The reflecting plate 151 is disposed on the bottom plate 111, one end of which is fixed to the third sidewall 117, and the other end of which is opposite to the one end of the reflecting plate 151 is fixed to the fourth sidewall 119. The reflector plate 151 reflects light emitted from the lamps 155 to the upper portion of the storage container 110.

Display

9 is an exploded perspective view of a display device according to an exemplary embodiment. FIG. 10 is a cross-sectional view of the display device illustrated in FIG. 9 taken along line III-III ′.

9 and 10, the display device 300 includes a storage container 310, a power supply unit 350, lamps 355, and a display panel 380. The power supply unit 350 includes lamp holders 330 and a power supply substrate 340.

The storage container 310, the lamp holders 330, the power supply substrate 340, and the lamps 355 are the storage container 110, the lamp holders 130, and the power supply substrate 140 shown in FIG. 8. And lamps 155 are substantially the same.

The display device 300 further includes a reflective plate 351, a side mold 358, and an optical sheet 360. The reflecting plate 351 is the same as the reflecting plate 151 shown in FIG. 8.

The side mold 358 covers the lamp holder 330. The side mold 358 is disposed on the bottom side plate 311 adjacent to the first side wall and the second side wall on which the openings 323 are formed, respectively. An upper step portion on which the optical sheet 360 is disposed is formed on the side mold 358.

The optical sheet 360 is emitted upward by improving optical characteristics of light emitted from the lamps 355, for example, brightness uniformity and front brightness. The optical sheet 360 includes a diffusion plate 361 and light collecting sheets 363 and 365.

The diffusion plate 361 diffuses the light emitted from the lamps 355 and emits light having improved luminance uniformity. The diffusion plate 361 is supported by the stepped portion formed in the side mold 358. The light collecting sheets 363 and 365 collect light emitted from the diffusion plate 361 in different directions, preferably perpendicular to each other, to improve front brightness.

The display device 300 further includes a middle mold 370. The middle mold 370 presses the edge of the optical sheet 360 and is coupled to the storage container 310. A panel guide groove is formed on an upper surface of the middle mold 370.

The display panel 380 receives the light emitted from the optical sheet 360 and converts the light into image light including image information. The display panel 380 is disposed on the stepped portions formed on the first to fourth sidewalls 513, 515, 517, and 519. The display panel 380 includes a first substrate 381, a second substrate 385, and a liquid crystal layer (not shown).

The first substrate 381 includes a lower substrate and a switching element. The lower substrate is a transparent glass substrate, and gate lines are formed in the horizontal direction on the lower substrate, and data lines are formed in the vertical direction by being insulated from the gate line. The gate line and the data line define a pixel area, and the pixel area is arranged in a matrix form.

The switching element is, for example, a thin film transistor (not shown) and is disposed in the pixel regions. The data line is connected to a source terminal of each of the thin film transistors, and the gate line is connected to a gate terminal of each of the thin film transistors. In addition, a pixel electrode made of a transparent conductive material is connected to the drain terminal of each of the thin film transistors.

The second substrate 385 is disposed to face the first substrate 381 at a predetermined interval. The second substrate 385 includes an upper substrate and a color pixel. The color pixels are arranged in a matrix form on the upper substrate to correspond to the pixel electrodes disposed in the pixel area. The color pixel includes an RGB color pixel which is expressed in a predetermined color when light passes. A common electrode made of a transparent conductive material is formed on the entire surface of the upper substrate on which the color pixels are disposed to correspond to the pixel electrode.

When a gate voltage is applied to the gate terminal of the thin film transistor and the thin film transistor is turned on, a data voltage is applied to the pixel electrode and an electric field is formed between the pixel electrode and the common electrode. Such an electric field changes the arrangement of the liquid crystals constituting the liquid crystal layer interposed between the first substrate 381 and the second substrate 385. Accordingly, the transmittance of light provided to the display panel 380 through the optical sheet 360 is changed so that the display panel 380 displays an image having a desired gray scale.

The display panel 380 further includes a printed circuit board 383 and a panel printed circuit film 384. The printed circuit board 383 outputs a panel driving signal such as the gate voltage and the data voltage. One side edge of the panel printed circuit film 384 is electrically connected to the display panel 380, and the other side edge of the panel printed circuit film 384 opposite to the one side edge is connected to the printed circuit board 383. Connected.

The display device 300 further includes a top chassis 390 that exposes the effective display area of the display panel 380 and is fastened to the storage container 310.

As described in detail above, when reworking the power supply board, the lamp holders are separated from the connectors formed on the power supply board without separating the lamps from the lamp holders. A rework operation may be performed on the power supply substrate. As a result, the rework of the backlight assembly and the display device can be performed more easily.

 In addition, a process of electrically connecting the electrode portion of the lamp, the power applying member, and the power applying member and the power supply substrate through soldering with wires, respectively, is omitted. As a result, assembly of the power supply unit, the backlight assembly having the same, and the display device is improved.

In the detailed description of the present invention described above with reference to the preferred embodiments of the present invention, those skilled in the art or those skilled in the art having ordinary skill in the art will be described in the claims to be described later It will be understood that various modifications and variations can be made in the present invention without departing from the scope of the present invention.

Claims (13)

A connection member having a plurality of openings; Lamp holders including a body inserted into the opening and a power applying member fixed to the body to apply a driving voltage to the lamp; And And a power supply board on which connectors are detachably coupled to the body exposed through the opening. The method of claim 1, wherein the body is Lamp guide unit for guiding the end of the lamp; And And a holding part fixed to the connector. The power supply unit according to claim 2, wherein the holding part has a fixing hook formed therein to prevent the lamp holder from being separated in a direction opposite to the direction of insertion into the opening. The method of claim 2, wherein the holding portion is formed with a fastening groove, The connector A first protrusion protruding from the power supply substrate and inserted into the fastening groove; And And a second protrusion protruding from a periphery of the first protrusion to cover an outer surface of the holding portion. The method of claim 4, wherein the power applying member protrudes from the inner surface of the fastening groove, And a connection terminal in contact with the power applying member in the first protrusion. A storage container including a bottom plate having a plurality of openings formed therein and a side wall disposed at a periphery of the bottom plate; A plurality of lamp holders inserted into the openings and exposed to the rear surface of the bottom plate, and a power applying member fixed to the body; A power supply substrate having a plurality of connectors into which the body exposed to the rear surface is inserted; And And a plurality of lamps fixed to the lamp holders. The method of claim 6, wherein the body is A lamp guide part exposed to the inside of the storage container; And And a fastening groove facing the lamp guide part, the holding part being inserted into the connector. The backlight assembly of claim 7, wherein a fixing hook is formed on the holding part to prevent the body from being separated from the opening. The method of claim 7, wherein the connector A first protrusion protruding from the power supply substrate and inserted into the fastening groove; And And a second protrusion protruding from a periphery of the first protrusion to cover a portion of an outer surface of the holding portion. The method of claim 7, wherein the power applying member protrudes from the inner surface of the fastening groove, And a connection terminal in contact with the power applying member in the first protrusion. Storage container; A power supply substrate including a plurality of lamp holders respectively inserted into a plurality of openings formed in the bottom plate of the storage container, and a connector into which the lamp holders exposed to the bottom surface of the bottom plate are inserted, respectively; unit; A plurality of lamps fixed to the lamp holders; And And a display panel configured to display an image based on the light emitted from the lamps. The method of claim 11, wherein the connector A first protrusion formed on the power supply substrate; And And a second protrusion formed to surround the first protrusion to be spaced apart from the first protrusion. The method of claim 12, wherein the lamp holder is An end portion inserted between the first protrusion and the second protrusion, the body including a holding part having a fixed hook applied to the rear surface, and a lamp guide part for guiding the end of the lamp; And And a power applying member fixed to the body to apply a driving voltage to the lamp.

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