KR20070053056A - Power supply unit, back light assembly having the power supply unit and display device having the same - Google Patents

Abstract

Disclosed are a power supply unit having improved assembly, a backlight assembly and a display device having the same. The power supply unit includes a power supply substrate and a lamp holder. Connection terminals are formed on the power supply substrate. The lamp holder includes a body and a power applying member. The power applying member protrudes from the rear surface of the body to have a spring shape and contacts the connection terminal. Therefore, assembling of the backlight assembly and the display device is improved and reliability of the electrical connection portion is improved.

Board, Connection Terminal, Power Supply Member, Lamp Holder, Connection Plate

Description

Power supply unit, backlight assembly and display device having the same {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.

3A and 3B are cross-sectional views taken along the line II ′ of the power supply unit illustrated in FIG. 2.

4A and 4B are perspective views of the lamp holder shown in FIG. 2.

FIG. 5 is a perspective view of the connecting plate and the power supply substrate shown in FIG. 2 viewed from different angles from those of FIG. 2.

6 is a perspective view of a power supply unit according to another embodiment of the present invention.

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

FIG. 8 is an enlarged view of the first region shown in FIG. 7.

9 is a rear perspective view of the backlight assembly illustrated in FIG. 7.

FIG. 10 is an exploded perspective view of the backlight assembly shown in FIG. 7.

FIG. 11 is a cross-sectional view of the backlight assembly illustrated in FIG. 10 taken along line II-II ′.

12 is a cross-sectional view of the backlight assembly illustrated in FIG. 10 taken along line III-III '.

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

14 is a cross-sectional view of the display device illustrated in FIG. 13 taken along the line III-III ′.

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

100: power supply unit 110: power supply board

111: insulated substrate 115: conductive wiring

116: connection terminal 130: lamp holder

131 body 132 bottom

133: lamp guide portion 135: power supply member

150: connection plate 310: storage container

320: lamp 570: display panel

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, a backlight assembly having the same, and a display device.

Among the various flat panel displays currently developed, the liquid crystal display is thinner and lighter than other display devices, has a low power consumption and a low driving voltage, and is widely used in various electronic devices because it can display images close to cathode ray tubes. Is being used.

The liquid crystal display may be classified into a transmissive liquid crystal display that displays an image using an external light source and a reflective liquid crystal display using natural light instead of the external light source. Electronic devices such as clocks and calculators that minimize power consumption often use the reflective liquid crystal display device. However, the transmissive liquid crystal display device is generally used in notebook computers that require high-quality image display.

The transmissive liquid crystal display uses a backlight disposed on a rear surface of a display panel as an external light source, and a backlight assembly employed in a conventional display device includes a direct downward type back light assembly and an edge ( 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, and the direct backlight assembly employing the cold cathode fluorescent lamp has a lamp for fixing the lamps on the bottom surface of the storage container. 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 storage 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, the lamp connector and the power supply board are detachably coupled, thereby improving the assemblability and easy to rework. It is to provide a power supply unit.

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 power supply substrate and a lamp holder. Connection terminals are formed on the power supply substrate. The lamp holder includes a body and a power applying member. The power applying member protrudes from the rear surface of the body to have a spring shape and contacts the connection terminal.

According to another aspect of the present invention, a backlight assembly includes a storage container, a plurality of lamps, a power supply substrate, and a lamp holder. The lamps are disposed on the bottom plate of the storage container, and the power supply substrate is disposed on the rear surface of the bottom plate. The lamp holder includes a body and a power applying member. The body is fixed to the power supply substrate and protrudes inwardly of the storage container. The power applying member protrudes from the body to have a spring shape and contacts the connection terminal formed on the power supply substrate.

According to another exemplary embodiment of the present invention, a display device includes a storage container, a plurality of lamps, a power supply board lamp connector, and a display panel. The lamps are disposed on the bottom plate of the storage container, and the power supply substrate is disposed on the rear surface of the bottom plate. A connection terminal is formed on one surface of the power supply substrate facing the bottom plate. The lamp connector includes a connecting plate, a body and a power applying member. The connection plate is disposed between the back side and the power supply substrate. The body is fixed to the connecting plate and protrudes into the storage container. The power applying member protrudes from the rear surface of the body to have a spring shape and contacts the connection terminal. The display panel is disposed above the lamps to display an image based on the light emitted from the lamps.

According to the power supply unit, the backlight assembly and the display device having the same, the step of fixing the lamp holder to the bottom plate of the storage container and the soldering process between the lamp holder and the power supply substrate are omitted, and the rework of the power supply substrate is eliminated. The assembly of the backlight assembly and the display device having the power supply unit can be improved and the number of components can be reduced.

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. 3A and 3B are cross-sectional views taken along the line II ′ of the power supply unit illustrated in FIG. 2.

1 to 3A, the power supply unit 100 includes a power supply substrate 110 and a lamp holder 130.

The power supply substrate 110 has a connection terminal 116 electrically connected to the lamp holder 130 to be described later. In detail, the power supply substrate 110 includes an insulating substrate 111, a power supply element 113, and a conductive wiring 115.

Female screw portions penetrating from the lower surface to the upper surface of the insulating substrate 111 are formed in the insulating substrate 111. The power supply element 113 is disposed on a lower surface of the insulating substrate 111 to output a lamp driving voltage. The power supply element 113 is an inverter for changing the source power voltage supplied from the outside into a lamp driving voltage and outputting it. 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. The number of the power supply elements 113 may vary according to the number of lamp holders 130.

The conductive wiring 115 is disposed inside the insulating substrate 111 and electrically insulated from the outside. The conductive wire 115 is electrically connected to the power supply element 113. As a portion of the upper surface of the insulating substrate 111 is removed, a portion of the conductive wiring 115 is exposed to the upper surface of the insulating substrate 111. As a result, a plurality of connection terminals 116 are formed on the insulating substrate 111.

4A and 4B are perspective views of the lamp holder shown in FIG. 2. Specifically, Fig. 4A shows the top of the lampholder, and Fig. 4B shows the back of the lampholder.

4A and 4B, the lamp holder 130 fixes the lamp 120 on the power supply substrate 110 and is electrically connected to the power supply substrate 110 to allow the lamp 120 to be electrically connected to the power supply substrate 110. Apply the lamp drive voltage to The lamp holder 130 includes a body 131 and a power applying member 135.

The body 131 includes a bottom part 132 and a lamp guide part 133.

Projections are formed in the width direction of the bottom portion 132 (the direction perpendicular to the longitudinal direction of the lamp 120 fixed to the body). The lamp guide part 133 is formed to extend from the bottom part 132, and a lamp guide groove in which an end of the lamp 120 is disposed is formed on the lamp guide part 133. The body 131 is preferably made of a material having excellent insulation.

The power applying member 135 is made of a conductive material and is disposed to penetrate from the upper portion of the body 131 to the bottom portion 132 of the body 131. A portion of the power applying member 135 protruding from the bottom portion 132 of the body 131 is defined as a terminal portion, and is opposed to the terminal portion of the power applying member 135 and protrudes to the upper portion of the body. Define the part as a connection.

The terminal portion protrudes inclined from the bottom portion 132 and the bottom portion 132. Accordingly, the terminal portion has a leaf spring shape. The connection part has an annular shape in which one side is opened to easily fix the electrode part 125 of the lamp 120.

FIG. 5 is a perspective view of the connecting plate and the power supply substrate shown in FIG. 2 viewed from different angles from those of FIG. 2.

2 and 5, the power supply unit 100 includes a plurality of lamp holders 130, and the lamp holders 130 are electrically connected to the power supply substrate 110, respectively. In order to facilitate assembly between the plurality of lampholders 130 and the power supply substrate 110, the power supply unit 100 further includes a connection plate 150.

The connection plate 150 is coupled to the insulating substrate 111. The connection plate 150 has a plate shape extending in one direction. Specifically, the connection plate 150 has a width smaller than that of the insulating substrate 111 and has a length similar to the length of the insulating substrate 111.

The connection plate 150 is preferably made of an electrically insulating material, and a plurality of coupling holes 151 are formed in the connection plate 150. The coupling holes 151 are arranged in a line along the length direction of the connection plate 150. The connection plate 150 is formed with female threads for fastening between the connection plate 150 and the power supply substrate 110.

As shown in FIGS. 3A and 3B, the body 131 of the lamp holder 130 is pressed to a predetermined pressure so that the protrusion formed on the bottom 132 of the body 131 is connected to the connection plate. It is inserted into the coupling hole 151 so as to be exposed to the lower surface of the (150). In this case, the body 131 is detachably coupled to the coupling hole 151 formed in the connection plate 150.

1 to 3B, the lamp holder 130 is inserted into the coupling hole 151 formed in the connection plate 150. However, in another embodiment, the connection plate 150 is connected to the connection plate 150. A conductive member exposed to the upper and lower surfaces of the 150, and the lamp holder 130 is electrically connected to the conductive member exposed to the upper surface of the connecting plate 150. Can be mounted on

The power supply unit 100 further includes a fastening member, for example, a screw 170. As the connection plate 150 and the insulating substrate 111 are coupled to each other by the screw 170, the terminal portion of the power applying member 135 is connected to the connection terminal 111 formed on the insulating substrate 111. Contact with the bottom 132 of the body 131. In addition, when the connection plate 150 and the insulating substrate 111 are separated, the terminal part is spaced apart from the bottom part 132 of the body 131 again by an elastic force to restore the original shape.

6 is a perspective view of a power supply unit according to another embodiment of the present invention. Specifically, it is a perspective view of a lamp holder included in the power supply unit.

Referring to FIG. 6, the power supply unit 200 is substantially the same as the power supply unit 100 illustrated in FIGS. 1 to 5 except for the lamp holder 230. The lamp holder 230 is substantially the same as the lamp holder 130 shown in FIGS. 4A and 4B except for the power applying member 235.

The power applying member 235 is substantially the same as the power applying member 135 shown in FIGS. 4A and 4B except for the terminal portion. The terminal portion protrudes from the bottom portion 232 of the body 231. The terminal portion is a kind of spring having a coil shape. As the connection plate and the insulating substrate are coupled, the terminal portion contacts the connection terminal formed on the insulating substrate and is pressed onto the bottom portion 232 of the body 231.

Backlight assembly

7 is a perspective view of a backlight assembly according to an embodiment of the present invention. FIG. 8 is an enlarged view of the first region shown in FIG. 7. 9 is a rear perspective view of the backlight assembly illustrated in FIG. 7.

7 to 9, the backlight assembly 400 includes a storage container 310, a plurality of lamps 320, a power supply substrate 410, and a lamp holder 430.

The storage container 310 includes a bottom plate 311 and first to fourth sidewalls 313, 315, 317, and 319.

The first to fourth sidewalls 313, 315, 317, and 319 are disposed at the periphery of the bottom plate 311. The first sidewall 313 and the second sidewall 315 are disposed to face each other. The third sidewall 317 and the fourth sidewall 319 are disposed to face each other, and connect the first sidewall 313 and the second sidewall 315, respectively.

A plurality of first openings 311a are formed along the first sidewall 313 in the bottom plate 311 near the first sidewall 313. A plurality of second openings 311b are formed along the second sidewall 315 in the bottom plate 311 near the second sidewall 315.

The lamps 320 are disposed on the bottom plate 311.

FIG. 10 is an exploded perspective view of the backlight assembly shown in FIG. 7. FIG. 11 is a cross-sectional view of the backlight assembly illustrated in FIG. 10 taken along line II-II ′. 12 is a cross-sectional view of the backlight assembly illustrated in FIG. 10 taken along line III-III '.

10 to 12, the power supply substrate 410 is the same as the power supply substrate 110 illustrated in FIGS. 1 to 5, and is disposed on the bottom surface of the bottom plate 311. The backlight assembly 400 further includes a connection plate 450 disposed between the bottom plate 311 and the power supply substrate 410. The connecting plate 450 is substantially the same as the connecting plate 150 shown in FIG. 2.

The lamp holder 430 is substantially the same as the lamp holder 130 shown in FIGS. 4A and 4B. The lamp holder 430 is fixed to the power supply substrate 410 through the connection plate 450. In this case, the power applying member 435 is in contact with the connection terminal 416 formed on the power supply substrate 410.

The lamp holder 430 protrudes into the storage container 310 through the first opening 311a formed in the bottom plate 311, and ends one end of the lamps 320 with the bottom plate 311. ) In this case, a lead wire extending from the first electrode part disposed at one end of the lamp 320 is inserted into the connection portion of the power applying member 435, and the power applying member 435 applies a lamp driving voltage to the lead wire. do.

The screw 470, which is a fastening member, penetrates through the power supply board 410, the connection plate 740, and the bottom plate 311, and passes the power supply substrate 410 and the connection plate 740 to the bottom plate 311. ). Accordingly, the terminal portion of the power applying member 435 is pressed against the bottom portion 432 of the body 431.

Referring to FIG. 10, the backlight assembly 400 further includes a ground substrate 401 and an insulation plate 405. The ground substrate 401 faces the power supply substrate 410 and is disposed on the bottom surface of the bottom plate 311. The ground substrate 401 grounds the second electrode portion disposed at the other end of the lamp 320. The insulating plate 405 is interposed between the ground substrate 401 and the bottom plate 311.

The lamp holder 430 is fixed to the insulating plate 405 and electrically connected to the ground substrate 401, and the storage container 310 is formed through the second opening 311b formed in the bottom plate 311. Protrude into the inside. The lamp holder 430 is the same as the lamp holder 430 described above for fixing the one end of the lamp 320, and fixes the other end of the lamp 320 on the bottom plate 311.

Display device

13 is an exploded perspective view of a display device according to an exemplary embodiment. 14 is a cross-sectional view of the display device illustrated in FIG. 13 taken along the line III-III ′.

13 and 14, the display device 600 includes a storage container 510, a plurality of lamps 520, a power supply substrate 610, a lamp connector, and a display panel 570.

Except for the display panel 570, the storage container, the lamps 320, and the power supply substrate 410 illustrated in FIGS. Here, the lamp connector is defined as a component in which the lamp holder 630 and the connection plate 650 shown in FIG. 13 are coupled.

The display device 600 further includes a side cover 530, an optical member 540, and a middle cover 560.

The side cover 530 is disposed inside the first side wall 513 and inside the second side wall 515 to cover an end of the lamp 520.

The optical member 540 is disposed on the side cover 530 to improve optical characteristics of light emitted from the lamps 520. The optical member 540 includes a diffusion plate 541 and light collecting sheets 543 and 545. The diffusion plate 541 diffuses the light emitted from the lamps 520 and the light collecting sheets 543 and 545 collect the light emitted from the diffusion plate 541.

A portion of the middle cover 560 corresponding to the bottom plate 511 is opened, and is coupled to the storage container 510 while pressing the edge of the optical member 540.

The display panel 570 displays an image based on light whose luminance uniformity and front luminance are improved by the optical member 540. The display panel 570 is supported by the stepped portion formed in the middle cover 560. The display panel 570 includes a first substrate 571, a second substrate 575, and a liquid crystal layer.

The first substrate 571 includes a lower substrate, a pixel electrode, and a switching element. The pixel electrode is formed on the lower substrate in a matrix form, and is transparent and conductive. The switching element applies a panel driving signal to the pixel electrode.

The second substrate 575 includes an upper substrate, a color pixel, and a common electrode. The upper substrate is disposed to face the lower substrate at regular intervals. The color pixels are disposed on the upper substrate in correspondence with the pixel electrodes, and receive light to pass light having a predetermined wavelength. A common electrode made of a transparent conductive material is disposed on the entire surface of the upper substrate on which the color pixels are disposed to correspond to the pixel electrode.

The display panel 570 further includes a printed circuit board 573 and a connection film 574. The printed circuit board 573 generates the panel driving signal, and the connection film 574 electrically connects the printed circuit board 573 and the first substrate 571.

When an electric field is formed between the pixel electrode and the common electrode according to the panel driving signal applied through the connection film 574 from the printed circuit board 573, the electric field is interposed between the pixel electrode and the common electrode. The arrangement of the liquid crystal layer is changed. Accordingly, the transmittance of light provided from the optical member 540 to the display panel 570 is changed, so that the display device 600 displays an image having a desired gray scale.

The display device 600 further includes a top chassis 590 that exposes the display area of the display panel 570 and is coupled to the storage container 530.

As described in detail above, according to the present invention, the power supply unit includes a power supply substrate, a connection plate and a lamp holder, and the power supply substrate is easily separated from the connection plate. Therefore, when reworking the power supply board, the power supply board may be separated from the connection plate without separating the lamps from the lamp holders, thereby performing a rework operation on the power supply board. have. As a result, the rework of the backlight assembly and the display device can be performed more easily.

On the other hand, the lamp holder includes a power supply member to which the electrode portion of the lamp is detachably fitted. As the lamp holder and the power supply substrate are coupled, the power applying member is directly connected to and electrically connected to a connection terminal formed on the power supply substrate. Therefore, 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 (15)

A power supply substrate on which a connection terminal is formed; And And a lamp holder having a body and a power applying member protruding from the rear surface of the body to have a spring shape and contacting the connection terminal. The power supply unit of claim 1, further comprising a connection plate to which the plurality of lamp holders are fixed and coupled to the power supply substrate. The power supply unit according to claim 2, wherein the power applying member has a leaf spring shape protruding obliquely from the rear surface. The power supply unit according to claim 2, wherein the power applying member protruding from the rear surface has a coil spring shape. The power supply unit as claimed in claim 2, wherein the power applying member in contact with the connection terminal is pressed onto the rear surface as the power supply substrate and the connection plate are coupled to each other. The method of claim 2, The connecting plate is formed with coupling holes into which a plurality of the bodies are respectively inserted, And the connection terminal corresponds to the coupling holes. The method of claim 2, wherein the power supply substrate An insulating substrate coupled to the connection plate; A power supply element disposed on the insulating substrate; And And a conductive wire electrically connected to the power supply element and partially exposed to the surface of the insulating substrate to form the connection terminal. The power supply unit according to claim 2, further comprising a fastening member for coupling the connection plate and the power supply substrate. The power supply unit according to claim 1, wherein the body has a lamp guide part accommodating an end portion of the lamp. The power supply unit according to claim 1, wherein one end of the power applying member protruding to the upper surface of the body has an annular shape in which one side is opened, and accommodates an electrode portion of the lamp. A storage container; A plurality of lamps disposed on a bottom plate of the storage container; A power supply substrate disposed on a rear surface of the storage container; And And a lamp holder having a body fixed to the power supply substrate and protruding inwardly of the storage container, and a power applying member protruding from the body to have a spring shape and contacting a connection terminal formed on the power supply substrate. Backlight assembly. The backlight assembly of claim 11, wherein the backlight assembly further comprises a connection plate to which the plurality of lamp holders are fixed and coupled to the power supply substrate. The backlight of claim 12, wherein the bottom plate is formed with openings in which a plurality of the bodies are inserted, respectively, and the connection plate has a plurality of bodies respectively inserted therein, and coupling holes corresponding to the connection terminals are formed. assembly. The backlight assembly of claim 12, further comprising a fastening member for mutually compressing the power supply substrate, the connection plate, and the bottom plate. A storage container; A plurality of lamps disposed on a bottom plate of the storage container; A power supply substrate disposed on a rear surface of the storage container and including a connection terminal; A connection plate disposed between the rear surface and the power supply substrate, a body fixed to the connection plate to protrude inwardly of the storage container, and a power supply projecting to have a spring shape from the rear surface of the body to contact the connection terminal; A lamp connector including an applying member; And And a display panel disposed on the lamps and configured to display an image based on the light emitted from the lamps.

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