KR20060092598A - Back light assembly and display device having the back light assembly - Google Patents

Abstract

A backlight assembly and a display device having the same are disclosed. The backlight assembly includes a storage container, a lamp and a light guide plate. The storage container includes a bottom plate, a first side wall disposed at a periphery of the bottom plate to form a storage space on the bottom plate, and a light reflecting member integrally formed on an inner surface of the bottom plate and the first side wall. The lamp is disposed on the bottom plate near the first side wall. The light guide plate is connected to a light incidence surface facing the lamp, a light reflection surface connected to one edge of the light incidence surface, and a light reflection surface facing the bottom plate, and to the other edge opposite to one edge of the light incidence surface, and facing the light reflection surface. Has a face. Therefore, heat dissipation characteristics of the display device are improved, and display quality is improved.

Backlight assembly, lamp cover, storage container, light reflecting member, light guide plate

Description

BACK LIGHT ASSEMBLY AND DISPLAY DEVICE HAVING THE BACK LIGHT ASSEMBLY}

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

FIG. 2 is an exploded perspective view of the backlight assembly shown in FIG. 1.

3 is a partial cross-sectional view taken along the line II ′ of the backlight assembly illustrated in FIG. 2.

4 is a cross-sectional view of a backlight assembly according to an embodiment of the present invention.

5 is a cross-sectional view of a display device according to an exemplary embodiment of the present invention.

The present invention relates to a backlight assembly and a display device having the same. More particularly, the present invention relates to a backlight assembly having improved heat dissipation and a display device having the same.

In general, the liquid crystal has an electrical property that is arranged in a specific direction in the electric field, and has an optical characteristic that the transmittance of light incident on the liquid crystal is changed by changing the arrangement of the liquid crystal according to the intensity of the electric field. A liquid crystal display device displays an image using the electro-optical characteristics of liquid crystals (LCs). Since the liquid crystal is a passive element that cannot generate light by itself, the liquid crystal display includes a backlight assembly to display an image in a dark place.

The backlight assembly employed in the conventional display device is classified into a direct downward type back light assembly and an edge type back light assembly according to the arrangement of the light sources. 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 of the backlight assembly, a fluorescent lamp is generally used, and a lot of heat is generated while the lamp generates light. Therefore, in order to prevent the display characteristics of the display panel from deteriorating due to the heat generated from the lamps, studies are being actively conducted to improve heat dissipation characteristics of the backlight assembly.

The edge type backlight assembly, on the other hand, includes a lamp cover that wraps around the lamp to protect the lamp and reflect light emitted from the lamp. Accordingly, heat generated from the lamp is radiated to the outside through many parts such as a lamp cover, a storage container, and a mold frame. As a result, heat dissipation of the display device is not smooth, and there is a problem that display characteristics of the display panel are degraded due to heat.

Accordingly, it is an object of the present invention to substantially eliminate one or more problems and limitations of the prior art.

One object of the present invention is to provide a backlight assembly having improved heat dissipation.

Another object of the present invention is to provide a display device with improved display quality and a slimmer display.

In order to achieve one object of the present invention, the present invention provides a backlight assembly including a storage container, a lamp and a light guide plate. The storage container includes a bottom plate, a first side wall and a light reflecting member. The first side wall is disposed at the periphery of the bottom plate to form an accommodation space on the bottom plate. The light reflecting member is formed integrally with the first side wall and the bottom plate. The lamp is disposed on the bottom plate near the first side wall. The light guide plate is disposed on the bottom plate. The light guide plate is connected to a light incidence surface facing the lamp, a light reflection surface connected to one edge of the light incidence surface, and a light reflection surface facing the bottom plate, and to the other edge opposite to one edge of the light incidence surface, and facing the light reflection surface. Has a face. Preferably, the storage container further includes a pair of second side walls. The pair of second side walls are arranged to face each other at the periphery of the bottom plate. The pair of second sidewalls are substantially perpendicular to the first sidewall and spaced apart from the first sidewall. Optionally, the backlight assembly further comprises a lamp holder. The lamp holder is coupled to the end of the lamp and is disposed between the first side wall and the second side walls to secure the lamp on the bottom plate. Optionally, the first sidewall includes a reflecting portion extending from the bottom plate and a supporting portion extending from the reflecting portion to face the bottom plate, wherein the inner side of the reflecting portion is formed concave with respect to the direction toward the lamp.

In accordance with another aspect of the present invention, there is provided a display device including a storage container, a lamp, a light guide plate, and a display panel. The display panel is disposed on the light exit surface of the light guide plate to display an image based on the light emitted from the light exit surface.

According to the backlight assembly and the display device according to the present invention, heat dissipation characteristics of the heat generated from the lamp are improved, thereby improving display quality of the display device.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, but the present invention is not limited or limited by the following embodiments.

Backlight assembly

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

Referring to FIG. 1, the backlight assembly 100 according to the present exemplary embodiment includes a storage container 110, a lamp 130, and a light guide plate 150.

FIG. 2 is an exploded perspective view of the backlight assembly shown in FIG. 1.

Referring to FIG. 2, the storage container 110 is preferably made of a material having excellent thermal conductivity in order to discharge heat generated incidentally to the outside as the lamp 130 to be described later is driven. In this embodiment, the storage container 110 is formed of a hard and light metal material, for example, aluminum or an aluminum alloy.

The storage container 110 includes a bottom plate 111, a first sidewall 113, and a light reflecting member 115.

The first side wall 113 is disposed at a peripheral portion of the bottom plate 111, for example, one edge of the bottom plate 111 to form an accommodation space on the bottom plate 111. In this embodiment, the storage container 110 may further include a pair of second sidewalls 117 and 119. The pair of second sidewalls 117 and 119 are disposed on the bottom plate 111 to be substantially perpendicular to the first sidewall 113. In this embodiment, the pair of second sidewalls 117 and 119 are spaced apart from the first sidewall 113 by a predetermined interval to provide an accommodation space of the lamp 130 to be described later.

3 is a partial cross-sectional view taken along the line II ′ of the back lit assembly shown in FIG. 2.

2 and 3, the light reflecting member 115 reflects light emitted from the lamp 130 to be described later. For this purpose, the light reflection member 115 may include a metal having excellent light reflection efficiency. The light reflection member 115 is integrally formed on the inner surface of the bottom plate 111 and the first sidewall 113 of the storage container 110. The light reflecting member 115 is coated on, for example, an inner surface of the bottom plate 111 and the first sidewall 113 of the storage container 110, and the second sidewalls 117, in order to improve light utilization efficiency. It is also preferably formed on the inner surface of 119).

The lamp 130 is disposed on the bottom plate 111 adjacent to the first sidewall 113 of the storage container 110. In the present embodiment, the backlight assembly 100 includes two straight lamps 130. The lamp 130 is transparent and has a tube shape. The lamp 130 includes a fluorescent material applied to an inner wall and electrode portions formed at ends of the lamp 130. The lamp 130 receives discharge gas therein, and when driving power is applied to the electrode parts, the discharge gas discharges light to generate light.

The backlight assembly 100 according to the present exemplary embodiment includes a lamp holder 135 that covers electrode portions formed at both ends of the lamp 130 and fixes the lamp 130 on the bottom plate 111 of the storage container 110. It may further include. The lamp holder 135 is disposed between the end of the first side wall 113 and one second side wall 117 of the storage container 110 and between the end of the first side wall 113 and the other second side wall 119. Are placed on each. The wire 137 for applying a driving voltage to the lamp is led out through the lamp holder 135 and guided by guide grooves formed in the second sidewalls 117 and 119 of the storage container 110.

The light guide plate 150 receives the first light emitted from the lamp 130 and emits the second light having improved luminance uniformity to the outside of the storage container 110. The light guide plate 150 has a plate shape and is disposed on the bottom plate 111. The light guide plate 150 has a light incident surface 151, a light reflecting surface 153, and a light emitting surface 155. The light incident surface 151 faces the lamp 130 disposed along the first sidewall 113. The light reflection surface 153 is connected to one edge of the light incident surface 151 and faces the bottom plate 111. The light exit surface 155 is connected to the other edge opposite to one edge of the light incident surface 151 and disposed to face the light reflective surface 151.

The backlight assembly 100 according to the present embodiment may further include the optical sheets 170 and the mold frame 190.

The optical sheets 170 are disposed on the light exit surface 155 of the light guide plate 150 to receive the second light exiting from the light guide plate 150 so that optical characteristics of the light, for example, brightness uniformity and front brightness, It emits a further improved third light. The mold frame 190 is coupled to the storage container 110 to fix the light guide plate 150 and the optical sheets 170 on the storage container 110.

4 is a partial cross-sectional view of a backlight assembly according to an embodiment of the present invention. The backlight assembly 300 according to the present exemplary embodiment is substantially the same as the backlight assembly 100 illustrated in FIGS. 1 to 3 except for the shape of the first sidewall 313 of the storage container 310.

Referring to FIG. 4, in this embodiment, the storage container 310 includes a bottom plate 311, a first sidewall 313, and a light reflection member 317. The first sidewall 313 is disposed at one edge of the bottom plate 311 to form a predetermined storage space on the bottom plate 311. The first sidewall 313 includes a reflector 314 and a support 315. The reflector 314 extends from one edge of the bottom plate 311 and the support 315 extends from the reflector 314 to face the bottom plate 311. In this embodiment, the inner surface of the reflector 314 is concave with respect to the direction toward the lamp 330 disposed close to the first sidewall 313. The light reflection member 317 is integrally formed on the inner surface of the bottom plate 311 and the first sidewall 313 of the storage container 310.

Display device

5 is a partial cross-sectional view of a display device according to an exemplary embodiment of the present invention.

Referring to FIG. 5, the display device 600 according to the present exemplary embodiment includes a storage container 510, a lamp 530, a light guide plate 550, optical sheets 570, a mold frame 590, and a display panel 630. ) And top chassis 670.

The display device 600 according to the present exemplary embodiment is substantially the same as the backlight assembly 100 illustrated in FIGS. 1 to 3 except for the display panel 630 and the top chassis 670.

The display panel 630 displays an image based on the light emitted from the optical sheets 570. The display panel 630 may be disposed on a step formed in the mold frame 590.

The display panel 630 may include a first substrate 610, a second substrate 620 facing the first substrate 610, and a liquid crystal layer interposed between the first substrate 610 and the second substrate 620. Include. Here, the first substrate 610 includes pixel electrodes arranged in a matrix form, and the second substrate 620 includes a common electrode facing the pixel electrodes. The first substrate 610 may further include a thin film transistor disposed on each pixel electrode to control a data voltage applied to the pixel electrode. The second substrate 620 may further include a color filter layer made of red, green, and blue color pixels.

The top chassis 670 presses an edge of the display panel 630 to fix the display panel 630 to the mold frame 590.

As described in detail above, according to the present invention, in the display device employing the edge type backlight assembly, the lamp cover surrounding the lamp is removed and the light emitted from the lamp is directly reflected on the inner surface of the storage container. Is reflected by. Therefore, heat generated from the lamp is transferred to the outside of the display device through the storage container directly without passing through the lamp cover. As a result, the internal temperature of the display device is maintained below a predetermined temperature, and the case in which normal operation of the liquid crystal is inhibited by heat is greatly reduced, thereby improving display quality of the display device.

In addition, since the lamp cover is removed, the weight and volume of the display device may be reduced.

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 (4)

A storage container including a bottom plate, a first side wall disposed at a periphery of the bottom plate to form an accommodation space on the bottom plate, and a light reflection member integrally formed on an inner surface of the bottom plate and the first side wall; A lamp disposed on the bottom plate near the first sidewall; And A light incident surface facing the lamp, a light reflecting surface connected to one edge of the light incident surface and in contact with the bottom plate, and connected to the other edge facing the one edge of the light incident surface and opposite the light reflecting surface A backlight assembly comprising a light guide plate having a light exit surface. The storage container of claim 1, wherein the storage container includes a pair of second sidewalls disposed to face each other at a peripheral portion of the bottom plate to be substantially perpendicular to the first sidewall and spaced apart from the first sidewall, The backlight assembly further includes a lamp holder coupled to an end of the lamp and disposed between the first sidewall and the ends of the second sidewalls facing the first sidewall to secure the lamp on the bottom plate. Backlight assembly, characterized in that. 2. The apparatus of claim 1, wherein the first sidewall includes a reflecting portion extending from the bottom plate and a supporting portion extending from the reflecting portion to face the bottom plate, wherein the inner side of the reflecting portion is in a direction facing the lamp. A backlight assembly, characterized in that formed concave with respect to. A storage container including a bottom plate, a first side wall disposed at a periphery of the bottom plate to form an accommodation space on the bottom plate, and a light reflection member integrally formed on an inner surface of the bottom plate and the first side wall; A lamp disposed on the bottom plate near the first sidewall; A light incident surface facing the lamp, a light reflecting surface connected to one edge of the light incident surface, and a light reflecting surface facing the bottom plate and the other edge opposite to the one edge of the light incident surface; A light guide plate having an opposing light exit surface; And And a display panel disposed on the light exit surface to display an image based on light emitted from the light exit surface.

Images