KR200447655Y1 - Backlight Unit for Liquid Crystal Display - Google Patents

Abstract

The present invention relates to a backlight unit for a liquid crystal display device. The backlight unit for a liquid crystal display device according to the present invention is a backlight unit for a liquid crystal display device, the bottom chassis having a light source disposed therein; and the front of the bottom chassis. A diffuser plate disposed; And a guide member supporting a rear surface of the diffusion plate by forming a height of an upper end portion of the bottom chassis and a diffusion plate higher than a lower end portion of the assembly surface of the bottom chassis and the diffusion plate. It is characterized by inclining toward the front. As a result, since the diffusion plate disposed in front of the bottom chassis is prevented from inclining toward the light source, a backlight unit for the liquid crystal display device capable of preventing bright lines from being generated while the diffusion plate approaches the light source is provided.

Backlight Unit, Side Mold, Inclined Projection, Diffusion Plate

Description

Backlight unit for liquid crystal display {BACKLIGHT UNIT FOR LIQUID CRYSTAL DISPLAY}

The present invention relates to a backlight unit for a liquid crystal display device, and more particularly, to a backlight unit for a liquid crystal display device which can prevent the diffusion plate from inclining toward a light source and thus prevent deterioration of display quality.

In general, a liquid crystal display device displays an image corresponding to a video signal by adjusting a light transmittance of liquid crystal cells arranged in a matrix form to a video signal supplied thereto.

Accordingly, the liquid crystal display includes a liquid crystal panel in which liquid crystal cells for adjusting the amount of light projected from the lower portion are arranged in an active matrix, and a backlight unit for projecting light from the lower portion of the liquid crystal panel. And a red, green, and blue color filter and a black matrix layer for distinguishing pixels, which are separately formed for each liquid crystal cell on an upper surface of the liquid crystal panel.

At this time, the backlight unit is for projecting the white light evenly from the rear of the liquid crystal panel, there are two types.

That is, one is a side type backlight unit in which a lamp is provided on the side of the liquid crystal panel to provide light to the liquid crystal layer, and the other is a direct type backlight unit in which the lamp directly provides light at the bottom of the liquid crystal panel.

Since the side type backlight unit is installed on the side of the liquid crystal panel to supply a light source to the liquid crystal layer through the reflecting plate and the light guide plate, the overall thickness can be reduced. Accordingly, a lamp for emitting a light source is mainly used for a laptop. Since it is located on the side of the panel, it is difficult to apply to a large area liquid crystal panel, and since light is supplied through the light guide plate, it is difficult to obtain high brightness, which is not suitable for a large area liquid crystal panel for LCD TVs.

On the other hand, the direct type backlight unit is mainly used to manufacture a liquid crystal panel for an LCD TV because the light emitted from the lamp is directly supplied to the liquid crystal layer, and can be applied to a large area liquid crystal panel as well as high brightness.

As shown in FIG. 1, the direct type backlight unit includes a bottom chassis 11 provided with lamp socket parts at both sides and a plurality of lamp support members on a bottom surface, a light source 12 fixed to the lamp support member, and a lamp. It comprises a side mold 13, which is assembled on both sides of the bottom chassis 11, the diffusion plate 14 and the plurality of optical film 15 seated on the side mold 13 to protect the socket portion And a middle mold 17 on which the liquid crystal panel 16 is seated, and a top chassis 18 coupled to the bottom chassis 11 while covering the entire middle mold 17 and the backlight unit. The device 10 is configured.

Accordingly, the light generated from the light source 12 is diffused in all directions while passing through the diffusion plate 14, and the light passing through the diffusion plate 14 passes through the optical films 15, and the traveling direction thereof is the liquid crystal panel ( 16 is adjusted to be perpendicular to the liquid crystal panel 16 to be incident.

However, when the liquid crystal display is used at a predetermined angle as shown in FIG. 2, the diffusion plate 14 inserted into the installation space "a" between the bottom chassis 11 and the middle mold 17 is an installation space. When the upper end portion of the diffuser plate 14 is inclined toward the liquid crystal panel 16, the distance between the light source 12 and the diffuser plate 14 is widened so that a bright line occurs. However, when the upper end portion of the diffusion plate 14 is inclined toward the light source 12 side, the distance from the light source 12 is narrowed, and a bright line is generated.

In particular, in the case of ultra-thin liquid crystal display devices recently released, since the distance between the light source and the diffusion plate is narrowly set in order to minimize the thickness of the liquid crystal display device, the problem as described above becomes more prominent.

The present invention was created to solve various problems of the prior art as described above. The display plate of the liquid crystal display device is suppressed by preventing the occurrence of bright lines by preventing the diffusion plate disposed in front of the bottom chassis from inclining toward the light source. It is an object of the present invention to provide a backlight unit for a liquid crystal display device that prevents the degradation.

In accordance with an aspect of the present invention, a liquid crystal display backlight unit includes: a bottom chassis in which a light source is disposed; and a diffuser plate disposed in front of the bottom chassis; And a guide member supporting a rear surface of the diffusion plate by forming a height of an upper end portion of the bottom chassis and a diffusion plate higher than a lower end portion of the assembly surface of the bottom chassis and the diffusion plate. It is achieved by a backlight unit for a liquid crystal display device characterized by inclining toward the front.

Here, the guide member is preferably formed of an inclined protrusion formed in a vertical direction on both sides of the bottom chassis is formed so that the height of the upper end is higher than the height of the lower end.

The backlight unit for an LCD of the present invention may further include side molds having the inclined protrusions formed on a front surface thereof and assembled to both front sides of the bottom chassis.

The bottom chassis of the backlight unit for a liquid crystal display device according to the present invention is provided with an installation groove in which a diffusion plate is accommodated in a front edge thereof, and the inclined protrusion is formed in a direction perpendicular to both side installation grooves of the bottom chassis.

In addition, the backlight unit for the LCD device of the present invention has an opening having a smaller size than that of the diffusion plate, and an inclined protrusion having a lower height than an upper end is formed on both sides of the rear surface, and then assembled to the front of the bottom chassis. It is preferable to further include a mold.

According to the present invention, by supporting the rear surface of the diffusion plate through the guide member formed with the height of the top is lower than the height of the bottom to prevent the diffuser plate from inclining toward the light source to suppress the generation of bright lines to reduce the display quality of the liquid crystal display device There is provided a backlight unit for a liquid crystal display device that can prevent the display.

Prior to the description, in the various embodiments, components having the same configuration will be representatively described in the first embodiment using the same reference numerals, and in other embodiments, different configurations from the first embodiment will be described. do.

Hereinafter, a backlight unit for a liquid crystal display device according to a first 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 unit for a liquid crystal display device of the present invention, and FIG. 4 is an exploded perspective view of a side mold according to the backlight unit for a liquid crystal display device of the present invention.

As shown in the drawing, the backlight unit for the liquid crystal display according to the present invention includes a bottom chassis 110 having a light source provided therein, side molds 120 assembled to both front sides of the bottom chassis 110, and the side surface. It comprises a guide member disposed on the front of the mold 120, and the diffusion plate 140 is supported on both sides of the rear surface by the guide member.

In particular, as shown in Figure 4 is formed in the longitudinal direction on the front side of the side mold 120, the guide member for supporting the back of the diffusion plate is inclined to the height (H1) of the upper end is formed higher than the height (H2) of the lower end It is made of a projection (130). Accordingly, the diffusion plate 140 supported by the guide member is inclined at a predetermined angle toward the front to prevent the diffusion plate 140 from being inclined toward the rear bottom chassis 110.

The inclined protrusion 130 is to incline the upper end of the diffusion plate 140 at an angle of 0.1 degrees toward the front, in the drawing is exaggerated to express that the inclined protrusion 130 is formed obliquely. Further, 'front' described on the specification is the liquid crystal panel side direction of the liquid crystal display device based on the diffusion plate, and 'rear' is the bottom chassis side direction.

The assembling state of the first embodiment of the above-mentioned backlight unit for a liquid crystal display device will now be described.

5 is a schematic front view of a backlight unit for a liquid crystal display of the present invention, and FIG. 6 is a cross-sectional view taken along the line A-A of FIG.

As shown in FIG. 5, side molds 120 having inclined protrusions 130 formed in a vertical direction on the front sides of the bottom chassis 110 are assembled, respectively, and a diffusion plate is disposed on the front side of the bottom chassis 110. 140 is disposed and both ends of the rear surface of the diffusion plate 140 are supported by the inclined protrusion 130 of the side mold 120.

Particularly, as shown in FIG. 6, since the inclined protrusion 130 formed on the front surface of the side mold 120 has a height H1 of the upper end portion higher than the height H2 of the lower end portion, the inclined protrusion 130 is formed by the inclined protrusion 130. The diffuser plate 140 on which both sides of the rear surface is supported is disposed to be inclined at a predetermined angle θ toward the front.

Accordingly, the upper end of the diffusion plate 140 which is inclined forward or backward in the installation space "a" according to the installation angle of the liquid crystal display device is inclined toward the rear light source, and the diffusion plate 140 approaches the light source. Since the bright line is prevented from being generated, the display quality of the liquid crystal display device is prevented from being lowered.

Meanwhile, as shown in FIG. 7, the inclined protrusion 130 ′ having the height H1 of the upper end lower than the height H2 of the lower end is formed on both rear surfaces of the middle mold M assembled at the front edge of the bottom chassis 110. It may be provided to support both sides of the front of the diffusion plate 140 toward the bottom chassis 110.

In addition, as shown in FIG. 8, when the installation grooves 112 for receiving the diffusion plate 140 are formed at the front edge of the bottom chassis 110, the diffusion grooves 140 are diffused in both side installation grooves 112 of the bottom chassis 110. It may be provided to support both sides of the back surface of the diffusion plate 140 by providing an inclined protrusion 130 for supporting both sides of the back surface of the plate 140.

On the other hand, in the above embodiments, the guide member is made of an inclined protrusion 130, for example, but as a configuration for supporting the rear surface of the diffusion plate 140 inclined, the vertical direction to the front of the side mold 120 Two or more protrusions different from each other, or protrusions formed at a predetermined height on the front upper end of the bottom chassis 110 may be made of a protrusion supporting the rear upper end of the diffusion plate 140.

The scope of the present invention is not limited to the above-described embodiment, but may be embodied in various forms of embodiments within the scope of the appended claims. Without departing from the gist of the invention claimed in the claims, it is intended that any person skilled in the art to which the present invention pertains falls within the scope of the claims described in the present invention to various extents which can be modified.

1 is an exploded perspective view of a conventional liquid crystal display device;

2 is a schematic side cross-sectional view of a backlight unit for a conventional liquid crystal display device;

3 is an exploded perspective view of a backlight unit for a liquid crystal display device of the present invention;

4 is an exploded perspective view of a side mold according to the backlight unit for a liquid crystal display device of the present invention;

5 is a schematic front view of a backlight unit for a liquid crystal display device of the present invention, and FIG. 6 is a cross-sectional view taken along the line A-A of FIG.

7 is a side cross-sectional view according to another embodiment of a backlight unit for a liquid crystal display device of the present invention;

8 is a schematic exploded perspective view of a backlight unit for a liquid crystal display device according to the present invention.

※ Explanation of code for main part of drawing

110: bottom chassis

120: side mold

130: inclined protrusion

140: diffusion plate

Claims (5)

delete In the backlight unit for a liquid crystal display device, A bottom chassis having a light source disposed therein; A diffusion plate disposed on the front surface of the bottom chassis; And, And a guide member supporting a rear surface of the diffuser plate by forming a height of an upper end portion of the bottom chassis and a diffuser plate higher than a lower portion thereof. The guide member is formed of an inclined protrusion formed in a vertical direction on both sides of the bottom chassis, the height of the upper end is higher than the height of the lower end, the diffuser plate is inclined back is supported by the guide member the upper end toward the front A backlight unit for a liquid crystal display device, characterized in that inclined. The method of claim 2, And a side mold formed on the front surface of the bottom chassis, the side molds being assembled to both front sides of the bottom chassis. The method of claim 2, The bottom chassis has an installation groove for receiving the diffusion plate is formed in the front edge, the inclined protrusion is formed in the vertical direction on both sides of the installation groove of the bottom chassis backlight unit for a liquid crystal display device. The method according to claim 3 or 4, An opening having a smaller size than the diffusion plate is formed in the center, and an inclined protrusion having a height lower than the upper end is formed on both sides of the rear surface, and further includes a middle mold assembled to the front of the bottom chassis. Backlight unit for the device.

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