KR20070118746A - Backlight unit and liquid crystal display using the same - Google Patents

Abstract

A backlight assembly and an LCD using the same are provided to simplify the structure of the LCD and improve assemblability by optimizing a connection structure between the electrode terminal of lamp's end parts and an inverter PCB(Printed Circuit Board). A backlight assembly includes a bottom cover(110), plural lamps(120), and a common electrode(160). The bottom cover has a hole(111) formed in the lower side of the inside. The lamps are set in the inside of the bottom cover to supply light. The common electrode is joined in the inside of the bottom cover, connects end parts of the lamps, and has a fastening projection(164) projected to the outside of the bottom cover through the hole.

Description

Backlight assembly and liquid crystal display using the same {Backlight unit and liquid crystal display using the same}

1 is a schematic cross-sectional view of a liquid crystal display according to the related art.

FIG. 2 is a diagram illustrating a part of the backlight assembly illustrated in FIG. 1.

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

4 is a view for explaining the coupling relationship between the lamp and the inverter substrate shown in FIG.

FIG. 5 is a detailed configuration diagram of the power connection member shown in FIG. 3.

6 is a front perspective view illustrating a state in which the power connection member of FIG. 3 is fitted to a bottom cover.

FIG. 7 is a rear perspective view illustrating a state in which the power connection member of FIG. 3 is fitted to the bottom cover.

8 is an exploded perspective view of a liquid crystal display according to an exemplary embodiment of the present invention.

(Explanation of symbols for the main parts of the drawing)

100: backlight assembly

110: bottom cover 111: hole

120: lamp 121: electrode terminal

130: reflective sheet 140: optical sheet

141 and 144: diffusion sheet 142 and 143: prism sheet

150: inverter PCB

151: socket 152: fastening groove

160: common electrode (common electrode)

161 and 162: plate electrode 163: lamp holder

164: fastening protrusion 165: stopper

200: liquid crystal panel 210: upper substrate

220: lower substrate 300: top cover

The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device having a backlight assembly.

The liquid crystal display device forms a liquid crystal layer having anisotropic dielectric constant between upper and lower substrates, which are transparent insulating substrates, and then adjusts the intensity of the electric field formed in the liquid crystal layer to change the molecular arrangement of the liquid crystal material, thereby It is a device that expresses a desired image by adjusting the amount of light transmitted through the upper substrate.

The liquid crystal display includes a liquid crystal display module (LCM), a driving circuit unit for driving the liquid crystal display module, and an outer case surrounding and protecting the liquid crystal display module.

The liquid crystal display module includes a liquid crystal panel in which liquid crystal cells are arranged in a matrix form between two transparent insulating substrates, a backlight assembly for supplying light to the liquid crystal panel, a cover for protecting them, and the like.

In this case, the backlight assembly emits light, and includes a cold cathode fluorescent lamp (CCFL), an external electrode fluorescent lamp (EEFL), a light emitting diode (LED), and the like as a light source. I use it.

The backlight assembly is divided into an edge type and a direct type according to the location of the light source. The edge type of the electron is a structure in which the light source is installed on the side of the light guide plate for guiding the light. It is applied to a liquid crystal display device having a relatively small size.

The latter direct type is mainly developed as the size of the liquid crystal display device becomes larger than 20 inches, and the structure directly supplies light to the front surface of the liquid crystal panel by arranging a plurality of light sources in a row under the diffusion sheet. to be. The direct type is mainly applied to a large liquid crystal display device that requires high luminance because the light utilization efficiency is higher than that of the edge type.

1 is a schematic cross-sectional view of a liquid crystal display according to the related art, and illustrates a liquid crystal display having a direct backlight assembly.

Referring to FIG. 1, a conventional liquid crystal display includes a liquid crystal panel 20 for displaying an image and a backlight assembly 10 for supplying light to the liquid crystal panel 20.

The liquid crystal panel 20 includes upper and lower substrates 21 and 22 facing each other and a liquid crystal layer (not shown) formed therebetween.

The backlight assembly 10 scatters light from one or more lamps 12 that emit light as a light source and a reflective sheet 13 that reflects the light generated by the lamp 12, the lamps 12 and the reflective sheet 13. And a bottom cover 11 for fixing and supporting the optical sheet 14 for condensing and the lamp 12.

The plurality of lamps 12 are arranged side by side in the longitudinal direction of the lamp 12 on the rear surface of the optical sheet 14 in a direct manner, and supplies light to the front surface of the optical sheet 14.

The bottom cover 11 is made of a material such as aluminum to prevent light leakage of visible light emitted from the lamps 12, and reflects visible light traveling toward the front and rear surfaces of the lamps 12 toward the front surface of the lamp 12. Improve the efficiency of use of light emitted from To this end, a reflective sheet 13 for reflecting light is attached to the bottom of the bottom cover 11.

The optical sheet 14 is to prevent the shape of the lamp 12 from appearing on the display surface of the liquid crystal panel 20 and to provide a light source having an overall uniform brightness distribution, and scattering of light generated from the lamp 12. Several sheets of diffusion sheet and prism sheet may be included to enhance the effect.

FIG. 2 is a diagram illustrating a part of the backlight assembly illustrated in FIG. 1.

On the bottom cover 11 of the backlight assembly 10, a plurality of lamps 12 are fixed at regular intervals to supply light, and electrode terminals 15 for receiving power are provided at both ends of each lamp 12. Is formed. The electrode terminal 15 is a low voltage terminal to which the ground voltage GND is applied or a high voltage terminal to which an AC waveform of high voltage is applied.

When the direct type backlight assembly 10 is driven in parallel, the low voltage terminals and the high voltage terminals formed at both sides of the lamps 12 are connected to the inverter substrate through a pair of power connection members 16. Both sides are connected in parallel, and power is supplied from the connected inverter board.

The electrode terminals 15 disposed at both ends of the lamp 12 are fitted to and fixed to a part of the power connection member 16.

A wire 18 for transmitting power for driving the lamp is connected to the power connection member 16 and fixed with a screw 17.

A pair of wires 18 respectively drawn out from a pair of power connection members 16 arranged at both ends of the lamp 12 are connected to one connector and connected to the inverter substrate.

However, in such a structure, a separate wire 18 must be separately configured, and a structure for drawing the wire 18 such as a connector or solder to the inverter substrate side must be additionally implemented, and thus, the structure is complicated, and the wire 18 is disconnected. There is a high possibility of defects such as or failure, and inefficient in assembly.

Therefore, the technical problem to be achieved by the present invention is to provide a backlight assembly that can simplify the structure and improve the assembly by optimizing the connection structure between the electrode terminal of the lamp end and the inverter substrate.

Another object of the present invention is to provide a liquid crystal display using the backlight assembly.

Technical problems to be achieved by the present invention are not limited to the above-mentioned technical problems, and other technical problems not mentioned above will be clearly understood by those skilled in the art from the following description. Could be.

The backlight assembly according to the present invention for achieving the above technical problem is a bottom cover (hole cover) is formed in the inner bottom surface, a plurality of lamps seated in a line inside the bottom cover to supply light, the bottom And a power connection member coupled to an inner side of the cover, connecting one end of the lamps, and a fastening protrusion formed to protrude out of the bottom cover through the hole.

The inverter may further include an inverter substrate positioned outside the bottom cover and having a socket corresponding to the fastening protrusion and coupled to the power connection member through the socket.

The power connection member may be connected to a low voltage terminal formed at one end of each of the lamps to receive a ground voltage GND.

The power connection member may be connected to a high voltage terminal formed at one end of each of the lamps to receive an AC waveform having a high voltage.

The power connection member connects the first plate electrode and the second plate electrode formed in parallel to each other, the first plate electrode and the second plate electrode, and grippers of the one end of each of the lamps to prevent movement. a lamp holder of a gripper type, a first fastening protrusion and a second fastening protrusion formed at positions facing each other on the first plate electrode and the second plate electrode, and a lamp formed on the second plate electrode and fitted into the lamp holder. It may include a stopper for fixing the.

Each of the plurality of lamps may be an external electrode fluorescent lamp (EEFL).

The bottom sheet may further include a reflective sheet formed on the inside of the bottom cover and an optical sheet formed on the lamps.

According to an exemplary embodiment of the present invention, a liquid crystal display includes a liquid crystal panel, a bottom cover having a hole formed on an inner bottom thereof, a plurality of lamps mounted on an inside of the bottom cover, and one end of the lamps connected to each other. And a power connection member having a fastening protrusion protruding outwardly, the backlight assembly being disposed under the liquid crystal panel to supply light to the liquid crystal panel, and surrounding the upper edge of the liquid crystal panel to be fastened to the bottom cover. Top cover.

The backlight assembly may further include an inverter substrate positioned outside the bottom cover and having a socket corresponding to the fastening protrusion and coupled to the power connection member through the socket.

The power connection member may be connected to a low voltage terminal formed at one end of each of the lamps to receive a ground voltage GND.

The power connection member may be connected to a high voltage terminal formed at one end of each of the lamps to receive an AC waveform having a high voltage.

The power connection member connects the first plate electrode and the second plate electrode formed in parallel to each other, the first plate electrode and the second plate electrode, and grippers of the one end of each of the lamps to prevent movement. a lamp holder of a gripper type, a first fastening protrusion and a second fastening protrusion formed at positions corresponding to each other on the first plate electrode and the second plate electrode, and a lamp formed on the second plate electrode and fitted into the lamp holder. It may include a stopper for fixing the.

Each of the plurality of lamps may be an external electrode fluorescent lamp (EEFL).

The backlight assembly may further include a reflective sheet formed inside the bottom cover and an optical sheet formed on the lamps.

 A bottom cover having a hole formed in an inner bottom surface, a plurality of lamps seated in a line inside the bottom cover to supply light, coupled to the inside of the bottom cover, and one end of each of the lamps And a gripper type lamp holder which is fixed to prevent movement, and a power connection member having a fastening protrusion protruding to the outside of the bottom cover through the hole.

The inverter may further include an inverter substrate positioned outside the bottom cover and having a socket corresponding to the fastening protrusion and coupled to the power connection member through the socket.

The power connection member may be applied with a ground voltage GND or an AC waveform having a high voltage.

The power supply connecting member is formed on a first plate electrode and a second plate electrode formed in parallel with each other, the lamp holder connecting the first plate electrode and the second plate electrode, and the first plate electrode and the second plate electrode to each other. The stopper may include a first fastening protrusion and a second fastening protrusion formed at an opposite position, and a stopper formed on the second plate electrode and fixed to the lamp holder.

Each of the plurality of lamps may be an external electrode fluorescent lamp (EEFL).

The bottom sheet may further include a reflective sheet formed on the inside of the bottom cover and an optical sheet formed on the lamps.

In addition, the liquid crystal display according to the present invention includes a liquid crystal panel, a bottom cover in which a hole is formed in an inner bottom surface, a plurality of lamps seated inside the bottom cover, and one end of each of the lamps inside the bottom cover. A backlight assembly below the liquid crystal panel, the backlight assembly including a gripper type lamp holder and a power connection member protruding outwardly from the bottom cover through the hole; and an upper edge of the liquid crystal panel. The cover includes a top cover coupled to the bottom cover.

The backlight assembly may further include an inverter substrate positioned outside the bottom cover and having a socket corresponding to the fastening protrusion to be coupled to the power connection member through the socket.

The power connection member may be applied with a ground voltage GND or an AC waveform having a high voltage.

The power supply connecting member is formed on a first plate electrode and a second plate electrode formed in parallel with each other, the lamp holder connecting the first plate electrode and the second plate electrode, and the first plate electrode and the second plate electrode to each other. The stopper may include a first fastening protrusion and a second fastening protrusion formed at a corresponding position, and a stopper formed on the second plate electrode to fix the lamp fitted to the lamp holder.

Each of the plurality of lamps may be an external electrode fluorescent lamp (EEFL).

The backlight assembly may further include a reflective sheet formed inside the bottom cover and an optical sheet formed on the lamps.

Specific details of other embodiments are included in the detailed description and the drawings. Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. Like reference numerals refer to like elements throughout.

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

3 is an exploded perspective view of a backlight assembly according to an exemplary embodiment of the present invention, and FIG. 4 is a view for explaining a coupling relationship between a power connection member, a lamp, and an inverter substrate shown in FIG. 3.

3 and 4, the backlight assembly 100 includes one or more lamps 120 that emit light as a light source, and a reflective sheet 130 that reflects light generated from the lamps, the lamp 120, and the reflective sheet 130. It includes an optical sheet 140 for scattering and condensing the light emitted from the), the bottom cover 110 for fixing and supporting the lamp 120.

The lamps 120 are arranged side by side in the longitudinal direction of the lamp 120 on the rear surface of the optical sheet 140 in a direct manner to be driven in parallel, and supply light to the front surface of the optical sheet 140.

The reflective sheet 130 formed on the inner surface of the bottom cover 110 reflects the light generated from the rear surface of the lamp 120, so as to maximize the use efficiency of the light generated from the lamp 120.

The optical sheet 140 is to prevent the shape of the lamp 120 from appearing on the display surface of the liquid crystal panel and to provide a light source having a uniform brightness distribution as a whole. The optical sheet 140 may include a plurality of diffusion sheets 141 and 144 and prism sheets 142 and 143 to enhance the scattering effect of the light generated by the lamp 120.

Electrode terminals 121 are formed at both ends of the lamp 120 to receive power, and the electrode terminals 121 are formed of a separate printed circuit board for supplying power to drive the lamp 120. It is connected to the substrate 150.

The plurality of lamps 120 are fixed to the front surface of the bottom cover 110 so as to be arranged side by side at regular intervals, and the inverter substrate 150 is disposed on the rear surface of the bottom cover 110 to drive the lamp 120.

Such a configuration of the lamp 120 is effective to apply to the external electrode fluorescent lamp easy to drive in parallel.

The coupling relationship between the lamp 120 and the inverter substrate 150 will be described in more detail as follows.

As shown in FIG. 4, the electrode terminals 121 at one side of the lamps 120 are inserted into the power connection member 160 and connected in parallel to each other. In some regions of the power connection member 160, the inverter substrate 150 and The fastening protrusion 164 for assembling of the lead terminal is formed.

Here, the electrode terminal 121 of the lamp 120 is formed at any one of both ends, and is a low voltage terminal to which the ground voltage GND is applied or a high voltage terminal to which an AC waveform of high voltage is applied. The inverter board 150 drives the lamp 120 by applying an AC waveform having a ground voltage GND or a high voltage according to the type of the electrode terminal 121 inserted into the power connection member 160.

For example, two inverter substrates 150 are formed at both ends of the lamp 120, and each inverter substrate 150 is provided at both ends of the lamp 120 through a pair of power connection members 160 corresponding to both sides. The plurality of lamps 120 may be driven in parallel by applying an AC waveform having a ground voltage (GND) and a high voltage to the low voltage terminal and the high voltage terminal.

Such a structure may be applied symmetrically at both ends of the lamp 120, but for convenience of description, the connection structure of the power connection member 160 and the inverter substrate 150 will be described below based on one side of the lamp 120. Will be described.

On the inverter substrate 150 disposed outside the bottom cover 110, a socket 151 having a fastening groove 152 having a shape corresponding to the fastening protrusion 164 of the power connection member 160 is formed, and the fastening protrusion is formed. 164 is inserted into the socket 151 so that the power connection member 160 for connecting the lamps 120 in parallel can be fastened to the inverter substrate 150.

3 and 4 illustrate only the case where a pair of fastening protrusions 164 are configured, the present invention is not limited thereto, and a larger number of fastening protrusions 164 and corresponding fastening grooves 152 are provided. The formed sockets 151 may be configured to reinforce the fastening force.

FIG. 5 is a detailed configuration diagram of the power connection member shown in FIG. 3. 6 and 7 illustrate front and rear perspective views, respectively, in which the power connection member of FIG. 3 is fitted to the bottom cover.

The power connection member 160 is disposed inside the bottom cover 110, and faces the first plate electrode 161 and the second plate electrode 162, the lamp holder 163, and the fastening protrusion 164 facing each other. Stopper 165 and the like.

The first plate electrode 161 and the second plate electrode 162 are formed parallel to each other along the height direction of the bottom cover 110 so that the lamps 120 placed in the longitudinal direction of the bottom cover 110 can be connected in parallel. do.

The plurality of lamp holders 163 are disposed at positions connecting the two plate electrodes 161 and 162, and are formed in a circular gripper type surrounding the lamp 120 to fix the lamp 120 and to move the lamp holder 163. prevent.

A pair of fastening protrusions 164 are formed in some of the areas between two adjacent lamp holders 163. The first fastening protrusion 164 and the second fastening protrusion 164 extend from the first plate electrode 161 and the second plate electrode 162, respectively, and are formed in the inner bottom surface of the bottom cover 110. It penetrates through the holes 111 and protrudes to the outside of the bottom cover 110 (see FIG. 7).

The stopper 165 protrudes vertically from the second plate electrode 162 positioned at the outer side of the two plate electrodes 161 and 162 to fix the lamp 120 fitted to the lamp holder 163.

The power connection member 160 is fixed by inserting the lamp 120 through the lamp holder 163, and is coupled to the inverter substrate 150 outside the bottom cover 110 through the fastening protrusion 164. The lamp 120 and the inverter substrate 150 may be electrically connected without additional structures such as wires, screws, and soldering.

8 is an exploded perspective view of a liquid crystal display according to an exemplary embodiment of the present invention.

Referring to FIG. 8, the liquid crystal display according to the exemplary embodiment includes a backlight assembly 100, a liquid crystal panel 200 displaying an image, a top cover 300, and the like.

The liquid crystal panel 200 is disposed between the upper and lower substrates 210, the lower substrate 220, and the two substrates 210 and 220 that are disposed on the upper and lower sides to face each other and maintain a uniform cell gap. A liquid crystal layer (not shown).

The top cover 300 is fastened to the backlight assembly 100 while covering the front edge and side surfaces of the liquid crystal panel 200 to protect the liquid crystal panel 200.

The backlight assembly 100 is disposed under the liquid crystal panel 200 to provide light toward the liquid crystal panel 200.

The backlight assembly 100 may include a bottom cover 110 having a hole 111 formed on an inner bottom thereof, a plurality of lamps 120 mounted inside the bottom cover 110, a power connection member 160, and the like. Include.

The power connection member 160 includes a gripper type lamp holder 163 into which the lamp 120 is fitted, a fastening protrusion 164 protruding to the outside of the bottom cover 110 through the hole 111, and the like. Is formed to connect one end of each lamp 120 in parallel.

Since the detailed structure of the backlight assembly 100 has been fully described with reference to FIGS. 3 to 7, a detailed description thereof will be omitted.

As such, when connecting the lamp 120 and the inverter substrate 150 on the backlight assembly 100, the connection structure between the lamp 120 and the inverter substrate 150 is simplified by eliminating a separate screw or wire assembly. The assemblability and fastening force of a liquid crystal display device can be improved using it.

Although embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains may implement the present invention in other specific forms without changing the technical spirit or essential features thereof. I can understand that.

Therefore, since the embodiments described above are provided to completely inform the scope of the invention to those skilled in the art, it should be understood that they are exemplary in all respects and not limited. The invention is only defined by the scope of the claims.

As described above, the backlight assembly and the liquid crystal display according to the present invention can optimize the connection structure between the electrode terminal of the lamp end and the inverter substrate, thereby simplifying the structure and improving the assemblability.

Claims (14)

A bottom cover having a hole formed in the inner bottom surface thereof; A plurality of lamps mounted in a line inside the bottom cover to supply light; And And a power connection member coupled to an inner side of the bottom cover and configured to connect one end of the lamps, and a fastening protrusion protruding to the outside of the bottom cover through the hole. The method of claim 1, And an inverter substrate positioned outside the bottom cover and having a socket corresponding to the fastening protrusion and coupled to the power connection member through the socket. The method of claim 1, The power connection member, And a low voltage terminal formed at one end of each of the lamps to receive a ground voltage (GND). The method of claim 1, The power connection member, And a high voltage terminal formed at one end of each of the lamps to receive a high voltage AC waveform. The method of claim 1, The power connection member, A first plate electrode and a second plate electrode formed in parallel to each other; A gripper type lamp holder which connects the first plate electrode and the second plate electrode and fixes one end of each of the lamps to prevent movement; First and second fastening protrusions formed at positions facing each other on the first plate electrode and the second plate electrode; And And a stopper formed on the second plate electrode to fix a lamp fitted to the lamp holder. The method of claim 1, Each of the plurality of lamps, A backlight assembly, characterized in that it is an External Electrode Fluorescent Lamp (EEFL). The method of claim 1, A reflective sheet formed inside the bottom cover; And The backlight assembly further comprises an optical sheet formed on top of the lamps. Liquid crystal panels; A power source having a bottom cover having a hole formed at an inner bottom surface, a plurality of lamps seated inside the bottom cover, and a fastening protrusion projecting outwardly of the bottom cover through the hole while connecting one end of the lamps; A backlight assembly having a connection member and disposed under the liquid crystal panel to supply light to the liquid crystal panel; And And a top cover surrounding the upper edge of the liquid crystal panel and fastened to the bottom cover. The method of claim 8, The backlight assembly, And an inverter substrate disposed outside the bottom cover and having a socket corresponding to the fastening protrusion and coupled to the power connection member through the socket. The method of claim 8, The power connection member, And a low voltage terminal formed at one end of each of the lamps to receive a ground voltage (GND). The method of claim 8, The power connection member, And a high voltage terminal formed at one end of each of the lamps to receive a high voltage AC waveform. The method of claim 8, The power connection member, A first plate electrode and a second plate electrode formed in parallel to each other; A gripper type lamp holder which connects the first plate electrode and the second plate electrode and fixes one end of each of the lamps to prevent movement; First and second fastening protrusions formed at positions corresponding to each other on the first plate electrode and the second plate electrode; And And a stopper formed on the second plate electrode to fix a lamp fitted to the lamp holder. The method of claim 8, Each of the plurality of lamps, An external electrode fluorescent lamp (EEFL), characterized in that the liquid crystal display device. The method of claim 8, The backlight assembly, A reflective sheet formed inside the bottom cover; And And an optical sheet formed on the lamps.

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