KR20080067086A - Backlight assembley and liquid crystal display having the same - Google Patents

Abstract

A backlight assembly and an LCD(Liquid Crystal Display) having the same are provided to omit an existing mold frame by installing a folding type cover in an upper end part of a receiving member, thereby reducing weight and volume and reducing costs. A backlight unit includes a lamp unit(310). A receiving member receives the backlight unit. The receiving member includes a bottom surface(410), a side wall part(420) and a folding type cover(440). The side wall part is upwardly bent in an edge of the bottom surface, and provides a receiving space of a predetermined depth. The folding type cover fixes the backlight unit, received in the receiving space, in an upper part. One side of the folding type cover is connected with an upper surface of a side of the receiving member, and the other side is extended toward the receiving space.

Description

BACKLIGHT ASSEMBLEY AND LIQUID CRYSTAL DISPLAY HAVING THE SAME}

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

FIG. 2 is an assembled cross-sectional view of the liquid crystal display of FIG. 1 taken along line II ′. FIG.

3 is a partial rear view illustrating the lower chassis of the liquid crystal display of FIG. 1.

4 is a partial cross-sectional view illustrating an assembly process of a backlight unit according to an exemplary embodiment of the present invention.

<Explanation of protection for main parts of drawing>

200: upper chassis 200: liquid crystal display panel

300: backlight unit 310: lamp unit

311: lamp 312: lamp holder

313: lamp cover 314: lamp wire

315: lamp connector 320: light guide plate

330: reflective sheet 340: optical sheet

400: lower chassis 421: groove

440: folding cover 500: backlight assembly

The present invention relates to a backlight assembly and a liquid crystal display device having the same, and more particularly, to a backlight assembly having a folding cover formed on an upper end of an accommodation member accommodating the backlight unit and a liquid crystal display device having the same.

Liquid crystal display is a display device that realizes an image by controlling the amount of light incident from a light source using the optical anisotropy of liquid crystal molecules and the polarization characteristics of a polarizing film. In recent years, its power consumption is small, and its application range is rapidly expanding.

Such a liquid crystal display includes a liquid crystal display panel displaying an image, a backlight unit disposed under the liquid crystal display panel, a mold frame surrounding the sides of the liquid crystal display panel and the backlight unit, It is comprised including the accommodating member which accommodates these, ie, an upper chassis and a lower chassis. Here, the backlight unit includes a lamp and a lamp wire connected to both electrodes of the lamp, and in general, the lamp wire is generally extended to the rear of the lower chassis for connection with an external power supply.

On the other hand, the liquid crystal display device is assembled in such a manner that the liquid crystal display panel and the backlight unit is accommodated in the mold frame, and then the mold frame is received in the lower chassis, and the upper chassis and the lower chassis are combined. In this assembly method, the lamp wire may be sandwiched between the mold frame and the lower chassis, or may be cut or shorted by the mold frame. Therefore, since the use of a wire holder (wire holder) and the like for fixing the position of the lamp wire is increased, the manufacturing cost is increased, and more attention is required to the operator, the workability is lowered. In addition, due to the material difference between the mold frame (typically 'plastic') and the lower chassis (typically 'metal'), the internal space may be contaminated by foreign materials generated by scratching a relatively weak mold frame. In addition, since the lower chassis and the mold frame are used together, the volume and weight are increased, and the cost is increased.

The present invention has been made to solve the above problems, and provides a backlight assembly capable of omitting a mold frame by forming a foldable cover at an upper end of an accommodating member accommodating the backlight unit, and a liquid crystal display device having the same. There is a purpose.

In addition, the present invention provides a backlight assembly and a liquid crystal display having the same by forming a groove for fixing the position of the lamp wire and the direction guide on the side wall of the housing member, thereby preventing the lamp wire from being disconnected or shorted during assembly. Has a different purpose.

According to an aspect of the present invention, there is provided a backlight assembly including a backlight unit including a lamp unit and an accommodation member accommodating the backlight unit, wherein the accommodation member is upward from a bottom surface and an edge of the bottom surface. It includes a side wall portion that is bent to provide a storage space of a predetermined depth and a folding cover for fixing the backlight unit accommodated in the storage space from above.

One end of the foldable cover is coupled to an upper end of the side wall portion of the accommodation member, and the other end is formed to extend toward the storage space.

The lamp unit preferably includes a lamp for emitting light, a lamp wire connected to both sides of the lamp, and a lamp cover surrounding the lamp and reflecting light emitted from the lamp in one direction. Here, the upper surface of the lamp cover may be integrally formed with the lower surface of the foldable cover, the lamp cover may include a reflective layer formed on the inner surface or a reflective sheet attached to the inner surface.

The side wall portion of the accommodation member may include a groove formed to guide the lamp wire connected to the lamp unit in a predetermined direction, and the groove is preferably formed to a depth greater than or equal to the thickness of the lamp wire to protect the lamp wire.

A liquid crystal display device according to the present invention for achieving the above object comprises a liquid crystal display panel for providing an image, and a backlight unit for providing light to the liquid crystal display panel; And an accommodation member accommodating the backlight unit, wherein the accommodation member includes a bottom surface, a side wall portion bent upward from an edge of the bottom surface, and a backlight unit accommodated in the accommodation space. It includes a foldable cover fixed from above.

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

However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various forms, and only the embodiments are intended to complete the disclosure of the present invention, and to those skilled in the art the scope of the invention. It is provided for complete information. Like reference numerals in the drawings refer to like elements.

1 is an exploded perspective view illustrating a liquid crystal display according to an exemplary embodiment of the present invention, FIG. 2 is an assembled cross-sectional view of the liquid crystal display of FIG. 1 taken along line II ′, and FIG. 3 is a liquid crystal display of FIG. 1. Partial rear view showing one end of the lower chassis in the device.

1 to 3, the liquid crystal display according to the present exemplary embodiment includes a liquid crystal display panel 200 displaying an image, a backlight unit 300 disposed under the liquid crystal display panel 200, and a liquid crystal display panel 200. It includes a pair of receiving members (100, 400) for receiving.

The liquid crystal display panel 200 may include a lower substrate 210 including a plurality of gate lines, a plurality of data lines crossing the gate lines, a thin film transistor and a pixel electrode formed at an intersection of the gate lines and the data lines, and a lower substrate 210. An upper substrate 220 corresponding to the substrate 210 and having a common electrode and a color filter formed thereon and a liquid crystal layer (not shown) positioned between the two substrates 210 and 220. A gate driver 230 for driving a gate line and a data driver 240 for driving a data line may be provided in an outer region of the substrate, typically the lower substrate 210, of the liquid crystal display panel 200. Here, the gate driver 230 is connected to each gate line of the liquid crystal display panel 200 to apply a predetermined gate signal to each gate line, and the data driver 240 is applied to each data line of the liquid crystal display panel 200. Connected to apply a predetermined data signal to each data line. The gate driver 230 and the data driver 240 may be manufactured in a chip form to form a liquid crystal display panel using any one of a chip on board (COB), tape automated bonding (TAB), and chip on glass (COG) method. It is preferable to mount to 200. For example, when the resolution of the liquid crystal display panel 200 is low, the TAB method is suitable, and when the resolution is high, the COG method is suitable. Of course, the chip may be directly formed on the lower substrate 210 in an amorphous silicon gate (ASG) manner.

Meanwhile, the backlight unit 300 including the lamp unit 310 is disposed on the rear surface of the liquid crystal display panel 200. The backlight unit 300 may be configured in an edge type or direct type according to the position of the lamp unit 310. The backlight unit 300 of the present embodiment emits light. The lamp unit 310, the light guide plate 320 disposed on the side of the lamp unit 310, the reflective sheet 330 disposed below the light guide plate 320, and a plurality of optical parts disposed on the light guide plate 320. It is configured in an edge-type manner including a sheet 340, the lamp unit 310 is installed on each side of the light guide plate 320. Of course, the lamp unit 310 may be installed only on one side of the light guide plate 320. As the light emitted from the backlight unit 300 passes through the liquid crystal display panel 200, the transmittance is changed and colored, and is emitted to the front of the liquid crystal display panel 200, thereby implementing a color image corresponding to an external image signal.

The lamp unit 310 covers at least one lamp 311, a lamp holder 312 fitted to both ends of the lamp 311 to protect and support the lamp 311, and a lamp 311. The lamp cover 313 reflects light emitted from the light toward the light guide plate 320 and a lamp wire 314 electrically connected to both electrodes of the lamp 311. Here, the lamp 311 is connected to an external power supply device (not shown) through the lamp wire 314 and the lamp connector 315 to receive a predetermined power supply voltage, and emit light using the power supply voltage. The lamp cover 313 is formed such that one surface facing the light incident surface of the light guide plate 320 is opened, and a reflective layer (not shown) is formed on an inner surface surrounding the lamp 311, or a reflective sheet (not shown). Is preferably formed. In addition, the lamp cover 313 may be fitted to one end of the light guide plate 320 to prevent light leakage between the lamp unit 310 and the light guide plate 320. On the other hand, the lamp cover 313 of the present embodiment may be formed separately from the folding cover 440, which will be described later, as shown, a portion of the surface of the lamp cover 313, part 441 of the folding cover 440 A part may be integrally formed to replace this.

The light guide plate 320 converts light in the form of a line light source incident from the lamp unit 310 into a surface light source and outputs the light. The light guide plate 320 mainly has a flat rectangular parallelepiped shape. Alternatively, the light guide plate 320 may have a wedge shape in which the thickness decreases as the distance from the lamp unit 310 increases.

The reflective sheet 330 reflects the light incident to the bottom of the lamp unit 310 to the top to reduce the light loss. In addition, the reflection amount of the entire incident light is adjusted so that the entire light emitting surface of the backlight unit 300 has a uniform luminance distribution. The reflective sheet 330 may be attached to the bottom surface 410 of the lower chassis 400 by an adhesive means, and may be formed integrally with the bottom surface 410 of the lower chassis 400.

The optical sheet 340 improves optical characteristics of light emitted to the upper portion of the light guide plate 320. The optical sheet 340 may be added or omitted some optical sheet according to the desired purpose, the optical sheet 340 of the present embodiment is from below the diffusion sheet 341, the first prism sheet 342 and the second prism May include a sheet 343. Here, the diffusion sheet 341 is provided with a scattering pattern on the emission surface to scatter and diffuse the light incident from the light guide plate 320 in an upward direction, and the first and second prism sheets 342 and 343 emit light. It has a prism pattern formed to cross each other on the surface to change the light incident inclined inclined vertically among the light incident from the diffusion sheet 341 to collect the light emitted in the upper direction.

The accommodation members 100 and 400 include an upper chassis 100 accommodating the liquid crystal display panel 200 and the backlight unit 300 from an upper side thereof and a lower chassis 400 accommodating the lower side thereof. Here, the upper chassis 100 has a planar portion in which an opening region is defined, and a sidewall portion bent downward at an edge thereof, and is formed in a frame shape in which the display region of the liquid crystal display panel 200 is exposed to the outside through the opening region. do. The lower chassis 400 has a bottom surface 410 on which the backlight unit 300 is seated, and a side wall portion 420 bent upward from an edge thereof, and the upper surface is opened to provide a storage space having a predetermined depth. It is formed in the form of a box. The liquid crystal display panel 200 and the backlight unit 300 are accommodated in the storage space provided by the combination of the upper chassis 100 and the lower chassis 400.

Meanwhile, in a general liquid crystal display device, a mold frame for protecting an edge of the liquid crystal display panel 200 which is vulnerable to impact and fixing the light guide plate 320 and the optical sheet 340 at a predetermined position is provided in the storage space. Are accepted. However, as described in the prior art, when the mold frame is used, there is a possibility that the lamp wire is disconnected or shorted due to the stamping by the mold frame, and the inside may be contaminated with foreign matter generated by scratching the relatively weak mold frame. There is a possibility. Accordingly, the liquid crystal display according to the present exemplary embodiment is integrally configured such that the lower chassis 400 may serve as a mold frame. The lower chassis 400 will be described in more detail as follows.

The lower chassis 400 of the present exemplary embodiment includes a folding cover 440 having one end coupled to an upper end of the side wall portion 420 and the other end extending toward an accommodation space formed by being surrounded by the side wall portion 420. The foldable cover 440 is formed to be folded left and right within a predetermined angle range around the coupling shaft 430, and an upper surface of the folding cover 440 serves to lift and support an edge of the liquid crystal display panel 200. Serves to press and fix the edge of the backlight unit 300. The foldable cover 440 may be provided on at least one sidewall portion 420 of the four sidewall portions, and two opposing sidewall portions, in particular, both sidewalls on which the lamp unit 310 of the backlight unit 300 is located. It is preferred to be provided at the top of the section. In this case, the lower surface 441 of the foldable cover 440 is further formed with a reflective layer (not shown) or a reflective sheet (not shown) made of a high reflectance material such as silver (Ag), thereby the lamp cover 313 described above. It can replace the upper surface of the).

In addition, the lower chassis 400 of the present exemplary embodiment includes a recess 421 formed on an outer surface of the side wall 420 to guide the lamp wire 314 in a predetermined direction. For example, the lamp wire 314 is drawn out of the lower chassis 400 through a hole formed in the side wall portion 420 of the lower chassis 400, and a recess formed in the outer side surface of the side wall portion 420. Guided along the 421 to the back of the lower chassis 400 is fixed to a predetermined position by the fixing member 450. At this time, the fixing member 450 serves to align the plurality of lamp wires 314 and to hold the lamp wires at a predetermined pressure. The fixing member 450 of the present embodiment is integrally formed with the lower chassis 400, but is formed in the rear edge portion of the lower chassis 400, but is not limited thereto, and may be formed separately from the lower chassis 400. The location may also vary depending on the length of the lamp wire 314. In addition, the groove 421 is preferably formed to a depth greater than the thickness of the lamp wire 314 to prevent damage to the lamp wire 314 protruding out of the groove 421 by the other mechanism during assembly.

4 is a partial cross-sectional view illustrating an assembly process of a backlight unit according to an exemplary embodiment of the present invention.

First, as shown in (a) of FIG. 4, the folding cover 440 is flipped outward so that an appliance to be stored in the lower chassis 400, that is, the backlight unit 300 is not disturbed. For example, the reflective sheet 300, the light guide plate 320 to which the lamp unit 300 is coupled, and the plurality of optical sheets 340 are sequentially stacked and received on the bottom surface 410 of the lower chassis 400. Thereafter, as shown in FIG. 4B, when the folding cover 440 of the lower chassis 400 is flipped inward, the edge of the stored mechanism, that is, the backlight unit 300 is pressed and stably fixed to the designated position. .

As such, the liquid crystal display according to the present exemplary embodiment has a structure in which a conventional mold frame is omitted, and the lower chassis 400, which is a storage member, may replace the role, and the backlight unit 300 accommodated in the lower chassis 400 may be used. ) Is coupled by the folding cover 440 can improve the workability during assembly.

As mentioned above, although this invention was demonstrated with reference to the above-mentioned Example and an accompanying drawing, this invention is not limited to this, It is limited by the following claims. Therefore, it will be apparent to those skilled in the art that the present invention may be variously modified and modified without departing from the technical spirit of the following claims.

As described above, in the present invention, since a folding cover is provided at an upper end portion of the housing member accommodating the backlight unit, the conventional mold frame may be omitted. Therefore, the weight and volume can be reduced, the cost can be reduced, and foreign matter defects due to scratching of the mold frame are not generated during assembly. In addition, the present invention is because the lamp wire is guided through the groove formed in the side wall of the receiving member, it is possible to prevent the lamp wire from being damaged by other mechanisms during assembly, it is necessary to use a separate wire holder for fixing the lamp wire There is no.

Claims (13)

A backlight unit including a lamp unit; And It includes a housing member accommodated in the backlight unit, The storage member, And a side wall portion bent upward from an edge of the bottom surface to provide a storage space having a predetermined depth, and a folding cover configured to fix the backlight unit accommodated in the storage space from above. The method according to claim 1, One end of the foldable cover is coupled to the upper end of the side wall portion of the housing member, the other end is extended to the housing space. The method according to claim 1, The lamp unit, A lamp for emitting light; Lamp wires connected to both sides of the lamp; And And a lamp cover surrounding the lamp and reflecting light emitted from the lamp in one direction. The method according to claim 3, The upper surface of the lamp cover is integrally formed with the lower surface of the folding cover. The method according to claim 3 or 4, The lamp cover includes a reflective layer formed on the inner surface or a reflective sheet attached to the inner surface. The method according to claim 1, The side wall portion of the receiving member includes a recess formed to guide the lamp wire connected to the lamp unit. The method according to claim 6, The recess is formed in the backlight assembly of more than the thickness of the lamp wire. A liquid crystal display panel for providing an image; A backlight unit providing light to the liquid crystal display panel; And It includes a housing member accommodated in the backlight unit, The storage member, And a sidewall portion bent upward from an edge of the bottom surface to provide a storage space of a predetermined depth, and a folding cover fixing the backlight unit accommodated in the storage space from above. The method according to claim 8, One end of the folding cover is coupled to the upper end of the side wall portion of the housing member, the other end is extended to the storage space. The method according to claim 8, The backlight unit, At least one lamp; Lamp wires connected to both sides of the lamp; And And a lamp unit surrounding the lamp and having a lamp cover reflecting light emitted from the lamp in one direction. The method according to claim 10, The upper surface of the lamp cover is formed integrally with the lower surface of the foldable cover. The method according to claim 8, And a sidewall portion of the accommodation member includes a recess formed to guide the lamp wire connected to the lamp unit. The method according to claim 12, The recess is formed in a depth of at least the thickness of the lamp wire.

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