KR20060016469A - Backlight unit and liquid crystal display including the same - Google Patents

Abstract

A backlight unit and a liquid crystal display including the same are disclosed. The backlight unit includes a light generator and a storage container. The light generating unit generates light. The storage container accommodates the light generating portion, and is formed with an intake portion through which external air is sucked in and an exhaust portion for discharging internal air. Accordingly, the thickness and weight of the backlight unit are reduced, and the cooling effect is increased.

Backlight Unit, Cooling, Convection

Description

Back light unit and liquid crystal display apparatus having the same

1 is an exploded perspective view of a backlight unit according to an exemplary embodiment of the present invention.

FIG. 2 is a plan view illustrating the backlight unit of FIG. 1 from below.

3 is a side view illustrating a cooling process of the backlight unit of FIG. 1.

4 is an exploded perspective view of a backlight unit according to another exemplary embodiment of the present invention.

FIG. 5 is a plan view illustrating the backlight unit of FIG. 4 from below.

6 is a side view for describing a cooling process of the backlight unit of FIG. 4.

7 is an exploded perspective view of a backlight unit according to another embodiment of the present invention.

FIG. 8 is a plan view illustrating the backlight unit of FIG. 7 from below.

9 is a side view for describing a cooling process of the backlight unit of FIG. 7.

10 is an exploded perspective view of a backlight unit according to another embodiment of the present invention.

FIG. 11 is a plan view illustrating the backlight unit of FIG. 10 from below.

FIG. 12 is a side view for describing a cooling process of the backlight unit of FIG. 10.

FIG. 13 is an exploded perspective view illustrating a liquid crystal display having the backlight unit of FIG. 1.                 

FIG. 14 is an exploded perspective view illustrating a liquid crystal display having the backlight unit of FIG. 7.

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

100: surface light source device 110: reflector

112: coupling hole 120: side wall

130: driving substrate 140: light emitting diode light source

200,300: storage container 210,310: bottom plate

220,320: first sidewall 230,330: second sidewall

240,340: third sidewall 250,350: fourth sidewall

260,360: Internal space 212,312: Through hole

 214,314: First driving circuit section 222a, 322a, 332a, 342a, 352a: Fan

222b, 322b, 332b, 342b, 352b: fan 224,324: second drive circuit portion

500,600 Backlight unit 800,900 Liquid crystal display device

820: optical sheet 840: liquid crystal display panel

842 thin film transistor substrate 844 liquid crystal

846: color filter substrate 848: drive module

860 chassis

The present invention relates to a backlight unit and a liquid crystal display including the same, and more particularly to a backlight unit and a liquid crystal display including the same that can improve the cooling effect.

In general, the liquid crystal display displays an image by using the electrical and optical characteristics of the liquid crystal. The liquid crystal display device has an advantage of a very small volume and light weight compared to the CRT, etc. As a result, it is widely used in portable computers, communication devices, liquid crystal TVs, and the like.

In order to control the liquid crystal, the liquid crystal display device requires a liquid crystal control part for controlling the liquid crystal and a light supply part for supplying light to the liquid crystal. As the light supply part of the liquid crystal display device, a cold cathode fluorescent lamp (CCFL) having a rod shape or a light emitting diode (LED) having a dot shape is mainly used.

The light emitting diode has the advantage of high color reproducibility. However, the light emitting diode generates a lot of heat due to its light emission characteristics. In particular, the light emitting diode has a lot of heat emitted behind the liquid crystal display, so that the temperature of the storage container housing the light emitting diode is very high.

In order to prevent the temperature increase of the storage container, the storage container may include a heat sink having a metal material such as aluminum. However, even if the storage container includes the heat sink, the thickness and weight of the storage container are increased to increase the thickness and weight of the liquid crystal display device.                         

Therefore, when the light emitting diode is used as a light supply part of a liquid crystal display device or when another device that generates a large amount of heat other than the light emitting diode is used as a light supply part, the temperature of the storage container increases or becomes thick. And weight increases.

Accordingly, one object of the present invention is to provide a backlight unit with increased cooling effect and reduced thickness and weight.

Another object of the present invention is to provide a liquid crystal display device having the above-described backlight unit.

In order to achieve the above object of the present invention, the present invention provides a backlight unit including a light generator and a storage container. The light generating unit generates light. The storage container houses the light generating unit, and an intake unit through which external air is sucked in and an exhaust unit through which internal air is discharged are formed.

In order to realize the other object of the present invention, the present invention provides a backlight unit including a light generating unit and a storage container. The light generating unit generates light. The accommodating container accommodates the light generating unit, and an intake unit for sucking outside air and an exhaust unit through which internal air is discharged are formed.

In order to realize another object of the present invention, the present invention includes a backlight unit and a liquid crystal display panel. The backlight unit includes a light generating unit for generating light and an accommodation container in which the light generating unit is accommodated, and an intake unit through which external air is sucked and a discharge base for discharging internal air are formed. The liquid crystal display panel displays an image using light emitted from the light generator.

In order to realize another object of the present invention, the present invention includes a backlight unit and a liquid crystal display panel. The backlight unit includes a light generating unit for generating light and an accommodation container including the light generating unit, an intake unit for sucking external air and an exhaust unit for emitting internal air. The liquid crystal display panel displays an image using light emitted from the light generator.

According to the present invention, the thickness and weight of the backlight unit are reduced, and the cooling effect is increased. In addition, the lowering of the brightness and contrast ratio of the backlight unit is prevented.

Hereinafter, a backlight unit and a liquid crystal display including the same according to exemplary 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 to the following embodiments.

Backlight unit

Example  One

1 is an exploded perspective view of a backlight unit according to an exemplary embodiment of the present invention, and FIG. 2 is a plan view illustrating the backlight unit of FIG. 1 from below.

1 and 2, the backlight unit 500 includes a surface light source device 100 and a storage container 200.                     

The surface light source device 100 may include a reflector 110, a sidewall 120, a driving substrate 130, and a plurality of light emitting diode light sources 140.

The reflective plate 110 has a rectangular flat plate shape, and reflects light directed downward from the light emitted from the light emitting diode light sources 140 upward. A plurality of coupling holes 112 are formed in the reflective plate 110 so that the light emitting diode light source 140 may be coupled thereto.

The side wall 120 is formed at an edge portion of the reflective plate 110 to allow the surface light source device 100 to be easily coupled with the storage container 200. In the present embodiment, the side wall 120 is formed at a pair of opposite edge portions of the reflecting plate 110.

The driving substrate 130 is arranged side by side under the reflective plate 110. Driving power is applied to the driving substrate 130 to light the LED light sources 140.

The light emitting diode light sources 140 are arranged in a row on the driving substrate 130 and coupled to penetrate through the coupling holes 112 to be positioned on an upper surface of the reflecting plate 110. Preferably, the light emitting diode light sources 140 include a red light emitting diode R generating red light, a green light emitting diode G generating green light, and a blue light emitting diode B generating blue light. The red light, green light and blue light emitting diodes R, G, and B generate white light by a predetermined combination ratio. For example, the ratio of the number of the red light emitting diodes R, the green light emitting diodes G, and the blue light emitting diodes B may be 2: 1: 1, or 2: 2: 1. In addition, the red, green and blue light emitting diodes R, G, and B may be disposed more than the number shown in FIG. 1. Alternatively, the light emitting diode light sources 140 may include a white light emitting diode that generates white light.

The storage container 200 accommodates the surface light source device 100. The storage container 200 includes a bottom plate 210, a first sidewall 220, a second sidewall 230, a third sidewall 240, and a fourth sidewall 250.

The bottom plate 210 has a rectangular flat plate shape and includes a first driving circuit 214 and a plurality of through holes 212. The first driving circuit unit 214 is disposed on the bottom plate 210 and drives the surface light source device 100. The through holes 212 are formed in a portion other than a portion in which the first driving circuit unit 214 is disposed, and are formed through the bottom plate 210. Air may move through the through holes 212. In the present embodiment, the through holes 212 function as an intake unit in which outside air is sucked in.

The first to fourth sidewalls 220, 230, 240, and 250 extend from edge portions of the bottom plate 210 to form an accommodation space and an internal space.

The first sidewall 220 is disposed at one edge portion of the bottom plate 210 and is preferably not perpendicular to the bottom plate 210. Specifically, the first side wall 220 is inclined outward with respect to the bottom plate 210. Unlike this, the first sidewall 220 may be perpendicular to the bottom plate 210. The second to fourth sidewalls 230, 240, and 250 are disposed at the other edge portions of the bottom plate 210, respectively, and are perpendicular to the bottom plate 210. The second sidewall 230 is disposed adjacent to the first sidewall 220. The third sidewall 240 is disposed adjacent to the second sidewall 230 and faces the first sidewall 220. The fourth sidewall 250 is disposed adjacent to the first and third sidewalls 220 and 240 and faces the second sidewall 230.

A plurality of fans 222a are formed on the first sidewall 220. The fans 222a are operated to flow air from the inner space to the outside. Therefore, heat generated in the surface light source device 100 is transferred from the inner space to the outside. In this embodiment, the fans 222a function as exhausts for releasing internal air.

The first sidewall 220 may further include a second driving circuit unit 224. The second driving circuit unit 224 is disposed on the first sidewall 220 and includes components of a device having the backlight unit 100 according to the present embodiment as a light supply part, for example, a liquid crystal display device. It can be used to drive the liquid crystal display panel. Alternatively, the second driving circuit unit 224 may be disposed on the second to fourth sidewalls 230, 240, and 250.

Meanwhile, the first to fourth sidewalls 220, 230, 240, and 250 may be coupled to the reflector 110 of the surface light source device 100 by hook coupling.

Hereinafter, a cooling process of the backlight unit having the above-described structure will be described in detail with reference to the drawings.

3 is a side view illustrating a cooling process of the backlight unit of FIG. 1.

Referring to FIG. 3, the light emitting diode array substrate 110 of the surface light source device 100 is driven to generate heat. The temperature of the air remaining in the internal space 260 between the surface light source device 100 and the storage container 200 increases by the heat. The air whose temperature is increased is discharged to the outside of the backlight unit 500 by the plurality of fans 222a formed in the first sidewall 220. When the hot air is discharged to the outside of the backlight unit 1000, the pressure of the internal space 260 is lowered. Therefore, low temperature air, which is cooler than hot air of the internal space 260, is introduced from the outside of the backlight unit 500 through the through holes 212. Accordingly, the processes of releasing high temperature internal air and inflow of low temperature external air are continuously repeated, and as a result, the heat generated in the surface light source device 100 is cooled by the flow of air.

In particular, the cooling process according to the present embodiment is mainly performed by the natural free convection phenomenon of air. That is, the heat generated in the surface light source device 100 increases the temperature of the air in the internal space 260, and the hot air rises above the internal space 260 by a convection action, thereby causing the fan. 222a are emitted to the outside. Subsequently, external low-temperature air flows into the internal space 260 through the through holes 212, and the temperature rises due to heat generated by the surface light source device and rises by convection. .

In the present embodiment, the through hole is formed on the bottom plate, but the through hole may be further formed on the first to fourth sidewalls, or may be formed only on the first to fourth sidewalls. . That is, the through hole may be formed in at least one of the bottom plate and the first to fourth sidewalls.

Also, in the present embodiment, the fan is formed on the first sidewall, but the fan may be further formed on any one or more of the bottom plate and the second to fourth sidewalls.

On the other hand, in the present embodiment, the surface light source device including the light emitting diode is used as a light generating unit, but a device including another light source that requires cooling may also be applied as the light generating unit of the present invention.

According to the present embodiment, components for performing a cooling function directly on the storage container of the backlight unit are formed. Thus, the thickness and weight of the backlight unit is reduced. In addition, by the natural convection phenomenon caused by the operation of the components, the cooling effect is increased. Accordingly, the lowering of the brightness and contrast ratio of the backlight unit is prevented.

Example  2

4 is an exploded perspective view of a backlight unit according to another exemplary embodiment of the present invention, and FIG. 5 is a plan view illustrating the backlight unit of FIG. 4 from below.

4 and 5, the backlight unit 600 includes a surface light source device 100 and a storage container 300.

Since the surface light source device 100 employed in the present embodiment has the same structure and function as the surface light source device shown in FIG. 1, repeated description thereof will be omitted.

The storage container 300 accommodates the surface light source device 100. The storage container 300 includes a bottom plate 310, a first sidewall 320, a second sidewall 330, a third sidewall 340, and a fourth sidewall 350.                     

The bottom plate 310 has a rectangular flat plate shape and includes a first driving circuit 314 and a plurality of through holes 312. The first driving circuit unit 314 is disposed on the bottom plate 310 and drives the surface light source device 100. The through holes 312 are formed at portions except for the portion where the first driving circuit portion 314 is disposed, and are formed through the bottom plate 310. Air may move through the through holes 312. In the present embodiment, the through holes 312 function as an intake unit in which outside air is sucked in.

The first to fourth sidewalls 320, 330, 340, and 350 extend from edge portions of the bottom plate 310 to form an accommodation space and an internal space.

The first to fourth sidewalls 320, 330, 340, and 350 are disposed at one edge portion of the bottom plate 310, respectively, and are not perpendicular to the bottom plate 310. Specifically, the first to fourth sidewalls 320, 330, 340, and 350 are inclined outward with respect to the bottom plate 310. Alternatively, some or all of the first to fourth sidewalls 320, 330, 340, and 350 may be perpendicular to the bottom plate 310. The first to fourth sidewalls 320, 330, 340, and 350 are sequentially disposed adjacent to each other. The first sidewall 320 and the third sidewall 340 face each other, and the second sidewall 330 and the fourth sidewall 350 face each other.

A plurality of fans 322a, 332a, 342a, and 352a are formed on the first to fourth sidewalls 320, 330, 340, and 350, respectively. The fans 322a, 332a, 342a, and 352a are operated to flow air from the interior space to the outside. Therefore, heat generated in the surface light source device 100 is transferred from the inner space to the outside. In this embodiment, the fans 322a, 332a, 342a, and 352a function as exhausts for releasing internal air.

The first sidewall 320 may further include a second driving circuit unit 324. The second driving circuit unit 324 is disposed on the first sidewall 320 and includes components of the device having the backlight unit 100 according to the present embodiment as a light supply part, for example, a liquid crystal display device. It can be used to drive the liquid crystal display panel. Alternatively, the second driving circuit unit 324 may be disposed on the second to fourth sidewalls 330, 340, and 350.

Meanwhile, the first to fourth sidewalls 320, 330, 340, and 350 may be coupled to the reflective plate 110 of the surface light source device 100 by hook coupling.

Hereinafter, a cooling process of the backlight unit having the above-described structure will be described in detail with reference to the drawings.

6 is a side view for describing a cooling process of the backlight unit of FIG. 4.

Referring to FIG. 6, the driving substrate 130 of the surface light source device 100 is driven to generate heat. The heat increases the temperature of the air staying in the internal space 360 between the surface light source device 100 and the storage container 300. The air whose temperature is increased is discharged to the outside of the backlight unit 2000 by the plurality of fans 322a, 332a, 342a, and 352a formed on the first to fourth sidewalls 320, 330, 340, and 350. When the hot air is discharged to the outside of the backlight unit 2000, the pressure of the internal space 360 is lowered. Therefore, cool air, which is colder than hot air of the internal space 360, is introduced from the outside of the backlight unit 2000 through the through holes 312. Accordingly, the processes of releasing high temperature internal air and inflow of low temperature external air are continuously repeated, and as a result, heat generated in the surface light source device 100 is cooled by the flow of air.

In the present embodiment, the through hole is formed on the bottom plate, but the through hole may be further formed on the first to fourth sidewalls, or may be formed only on the first to fourth sidewalls. . That is, the through hole may be formed in at least one of the bottom plate and the first to fourth sidewalls.

Also, in the present embodiment, the fan is formed on the first to fourth sidewalls, but the fan may be further formed on the bottom plate, and the fan is the bottom plate and the first to fourth sidewalls. Only some of these may be formed. That is, the fan may be formed on at least one of the bottom plate and the first to fourth sidewalls.

On the other hand, in the present embodiment, the surface light source device including the light emitting diode is used as a light generating unit, but a device including another light source that requires cooling may also be applied as the light generating unit of the present invention.

According to the present embodiment, components for performing a cooling function directly on the storage container of the backlight unit are formed. In particular, the fans are formed on various sidewalls of the storage container to further improve the cooling function. Thus, the thickness and weight of the backlight unit is reduced. In addition, by the natural convection phenomenon caused by the operation of the components, the cooling effect is increased. Accordingly, the lowering of the brightness and contrast ratio of the backlight unit is prevented.

Example  3

7 is an exploded perspective view of a backlight unit according to another exemplary embodiment of the present invention, and FIG. 8 is a plan view of the backlight unit of FIG. In the third embodiment, components having the same structure and function as those in the first embodiment will be denoted by the same reference numerals, and detailed description thereof will be omitted.

7 and 8, a plurality of fans 222b are formed on the first sidewall 220. The fans 222b are operated to flow air from the outside into the interior space. Therefore, heat generated in the surface light source device 100 is cooled by the low temperature air introduced from the outside. In the present embodiment, the fans 222b function as an intake unit for sucking outside air. In addition, the fans 222b function as a cooler that actively cools the surface light source device 100.

Hereinafter, a cooling process of the backlight unit having the above-described structure will be described in detail with reference to the drawings.

9 is a side view illustrating a cooling process of the backlight unit of FIG. 7.

9, the driving substrate 130 of the surface light source device 100 is driven to generate heat. The temperature of the air staying in the internal space 260 between the surface light source device 100 and the storage container 200 may increase due to the heat. Here, the fans 222b inject external air of the backlight unit 500 at a low temperature into the internal space 260 at high speed. The injected external air impinges on the reflecting plate 110 that generates heat to cool the reflecting plate 110. In the meantime, since the outside air is introduced into the interior by the fans 222b, the internal pressure increases. Therefore, air in the internal space 260 is discharged to the outside of the backlight unit 500 through the through holes 212. Accordingly, the inflow of the low temperature external air and the discharge of the high temperature internal air are continuously repeated, and as a result, the heat generated in the surface light source device 100 is cooled by the flow of air.

In particular, the cooling process according to the present embodiment is mainly caused by the forced convection of the fans (222b) to function as the cooler. That is, the low temperature external air introduced by the fans 222b collides with the surface light source device 100 that generates heat to cool the surface light source device 100. Accordingly, the fans 222a according to the first embodiment have a passive function of releasing high-temperature air in the internal space 260 to the outside, whereas the fans 222b according to the present embodiment are active in the cooler. Function In general, the heat transfer effect due to forced convection is greater than the heat transfer effect due to natural convection. Therefore, cooling according to the present embodiment may be more effective.

In the present embodiment, the through hole is formed on the bottom plate, but the through hole may be further formed on the first to fourth sidewalls, and may be formed only on the first to fourth sidewalls. That is, the through hole may be formed in at least one of the bottom plate and the first to fourth sidewalls.

Also, in the present embodiment, the fan is formed on the first sidewall, but the fan may be further formed on any one or more of the bottom plate and the second to fourth sidewalls.                     

On the other hand, in the present embodiment, the surface light source device including the light emitting diode is used as a light generating unit, but a device including another light source that requires cooling may also be applied as the light generating unit of the present invention.

According to the present embodiment, components for performing a cooling function directly on the storage container of the backlight unit are formed. Thus, the thickness and weight of the backlight unit is reduced. In addition, by the forced convection phenomenon caused by the operation of the components, the cooling effect is increased. As a result, a decrease in brightness and contrast ratio of the backlight unit is prevented.

Example  4

10 is an exploded perspective view of a backlight unit according to another exemplary embodiment of the present invention, and FIG. 11 is a plan view of the backlight unit of FIG. In the fourth embodiment, components having the same structure and function as those in the second embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

10 and 11, the plurality of fans 322b, 332b, 342b, and 352b are formed on the first to fourth sidewalls 320, 330, 340, and 350, respectively. The fans 322b, 332b, 342b, and 352b may cool the heat generated by the surface light source device 100 by sucking low temperature external air. In the present embodiment, the fans 322b, 332b, 342b, and 352b function as an intake unit for sucking outside air. In addition, the fans 322b, 332b, 342b, and 352b function as coolers that actively cool the surface light source device 100.                     

Hereinafter, a cooling process of the backlight unit having the above-described structure will be described in detail with reference to the drawings.

FIG. 12 is a side view for describing a cooling process of the backlight unit of FIG. 10.

Referring to FIG. 12, the driving substrate 130 of the surface light source device 100 is driven to generate heat. The temperature of the air staying in the internal space 360 between the surface light source device 100 and the storage container 300 may increase due to the heat. Here, the fans 322b, 332b, 342b, and 352b inject external air of the backlight unit 600 at a low temperature into the internal space 360 at high speed. The injected external air impinges on the reflecting plate 110 that generates heat to cool the reflecting plate 110. In the meantime, since the outside air is introduced into the inside by the fans 322b, 332b, 342b, and 352b, the internal pressure increases. Therefore, air in the interior space 360 is discharged to the outside of the backlight unit 600 through the through holes 312. Accordingly, the inflow of the low temperature external air and the discharge of the high temperature internal air are continuously repeated, and as a result, the heat generated in the surface light source device 100 is cooled by the flow of air.

In the present embodiment, the through hole is formed on the bottom plate, but the through hole may be further formed on the first to fourth sidewalls, and may be formed only on the first to fourth sidewalls. That is, the through hole may be formed in at least one of the bottom plate and the first to fourth sidewalls.

Also, in the present embodiment, the fan is formed on the first to fourth sidewalls, but the fan may be further formed on the bottom plate, and the fan is the bottom plate and the first to fourth sidewalls. Only some of these may be formed. That is, the fan may be formed on at least one of the bottom plate and the first to fourth sidewalls.

On the other hand, in the present embodiment, the surface light source device including the light emitting diode is used as a light generating unit, but a device including another light source that requires cooling may also be applied as the light generating unit of the present invention.

According to the present embodiment, components for performing a cooling function directly on the storage container of the backlight unit are formed. In particular, the fans are formed on various sidewalls of the storage container to further improve the cooling function. Thus, the thickness and weight of the backlight unit is reduced. In addition, by the forced convection phenomenon caused by the operation of the components, the cooling effect is increased. Accordingly, the lowering of the brightness and contrast ratio of the backlight unit is prevented.

LCD Display

Example  5

FIG. 13 is an exploded perspective view illustrating a liquid crystal display having the backlight unit of FIG. 1.

Referring to FIG. 13, the liquid crystal display device 800 includes a backlight unit 500, a liquid crystal display panel 840, and a chassis 860.

Since the backlight unit 500 employed in the present embodiment has the same structure and function as the backlight unit illustrated in FIG. 1, repeated description thereof will be omitted.                     

The liquid crystal display panel 840 displays an image by using light emitted from the surface light source device 100. The liquid crystal display panel 840 includes a thin film transistor (TFT) substrate 842, a liquid crystal 844, a color filter substrate 846, and a driving module 848.

The TFT substrate 842 includes a pixel electrode (not shown) arranged in a matrix form, a thin film transistor (not shown), a gate line (not shown), and a data line (not shown) that apply a driving voltage to each of the pixel electrodes. Include.

The color filter substrate 846 includes a color filter (not shown) disposed to face the pixel electrode formed on the TFT substrate 842, and a common electrode (not shown) formed on the color filter.

The liquid crystal 844 is interposed between the TFT substrate 842 and the color filter substrate 846.

The driving module 848 drives the liquid crystal display panel 840. Alternatively, in order to drive the liquid crystal display panel 840, the second driving circuit unit 224 may be disposed on any one of the bottom plate 210 and the first to fourth sidewalls 220, 230, 240, and 250.

An edge portion of the color filter substrate 846 is wrapped by the chassis 860, and a portion of the chassis 860 is coupled to the storage container 200. The chassis 860 prevents the liquid crystal display panel 840 from being vulnerable to external shock and prevents the liquid crystal display panel 840 from flowing.

The liquid crystal display device 800 may further include an optical sheet 820 for improving luminance uniformity of the light emitted from the surface light source device 100. The optical sheet 820 may include a diffusion sheet, a prism sheet, a protective sheet, and the like.

A middle chassis (not shown) may be further provided above the optical sheet 820. The middle chassis contacts the optical sheet 820 and presses the optical sheet 820 toward the storage container 200.

According to the present embodiment, components for performing a cooling function directly on the storage container of the backlight unit are formed. Thus, the thickness and weight of the backlight unit is reduced. In addition, by the natural convection phenomenon caused by the operation of the components, the cooling effect is increased. Accordingly, the thickness and weight of the liquid crystal display including the backlight unit are reduced, the cooling effect is increased, and the lowering of the brightness and contrast ratio is prevented.

Example  6

FIG. 14 is an exploded perspective view illustrating a liquid crystal display having the backlight unit of FIG. 7.

Referring to FIG. 14, the liquid crystal display device 900 includes a backlight unit 600, a liquid crystal display panel 840, and a chassis 860.

The liquid crystal display according to the present exemplary embodiment has the same structure and function as the liquid crystal display according to the fifth exemplary embodiment except for the backlight unit. In addition, the backlight unit 600 employed in the present embodiment has the same structure and function as the backlight unit illustrated in FIG. 2.                     

 According to the present embodiment, components for performing a direct cooling function are formed in the storage container of the backlight unit. Thus, the thickness and weight of the backlight unit is reduced. In addition, by the forced convection phenomenon caused by the operation of the components, the cooling effect is increased. Accordingly, the thickness and weight of the liquid crystal display including the backlight unit are reduced, the cooling effect is increased, and the lowering of the brightness and contrast ratio is prevented.

As described above, according to the present invention, according to the present embodiment, components for performing a cooling function directly on the storage container of the backlight unit are formed. Thus, the thickness and weight of the backlight unit is reduced.

In addition, by the natural convection phenomenon or forced convection phenomenon caused by the operation of the components, the cooling effect is increased.

As a result, the thickness and weight of the liquid crystal display including the backlight unit are reduced, the cooling effect is increased, and the luminance and contrast ratio are prevented from being lowered.

In the detailed description of the present invention described above with reference to a preferred embodiment of the present invention, those skilled in the art or those skilled in the art having ordinary knowledge in the scope of the invention 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 (28)

A light generator for generating light; And And a storage container accommodating the light generating unit and having an intake unit through which external air is sucked in and an exhaust unit through which the air is discharged. The backlight unit of claim 1, wherein the storage container includes a bottom plate and a plurality of sidewalls extending from an edge portion of the bottom plate to accommodate the light generating unit. 3. The display device of claim 2, wherein the sidewalls are formed of a first sidewall, a second sidewall disposed adjacent to the first sidewall, a third sidewall disposed adjacent to the second sidewall and opposite the first sidewall, and the first sidewall. And a fourth sidewall disposed adjacent to the third sidewall and facing the second sidewall. 4. The liquid crystal display of claim 3, wherein the intake unit includes at least one through hole formed in at least one of the bottom plate and the first to fourth sidewalls, and the exhaust unit includes the bottom plate and the first to fourth sidewalls. And at least one fan formed in at least one of the backlight units. The backlight unit of claim 4, wherein the through hole is formed through the bottom plate, and the fan is formed on the first side wall. The backlight unit of claim 5, wherein the first sidewall is inclined outward with respect to the bottom plate. The backlight unit of claim 4, wherein the fan is formed on the first to fourth sidewalls, respectively. The backlight unit of claim 2, further comprising a first driving circuit unit disposed on any one of the bottom plate and the sidewalls of the storage container to drive the light generating unit. The backlight unit of claim 1, wherein the light generating unit is a surface light source device. 10. The backlight unit of claim 9, wherein the surface light source device comprises a light emitting diode light source. The backlight unit of claim 10, wherein the surface light source device further comprises a reflector disposed between the storage container and the light emitting diode light source. A light generator for generating light; And And a storage container accommodating the light generating unit, and formed with an intake unit for sucking external air and an exhaust unit for discharging internal air. The storage container of claim 12, wherein the storage container includes a bottom plate and a plurality of sidewalls extending from an edge portion of the bottom plate, wherein the sidewalls include a first sidewall and the first sidewall. A second sidewall disposed adjacent to the first sidewall, a third sidewall disposed adjacent to the second sidewall and opposite the first sidewall, and disposed adjacent to the first and third sidewalls and opposite the second sidewall; And a fourth sidewall. The method of claim 13, wherein the exhaust portion comprises at least one through hole formed in at least one of the bottom plate and the first to fourth sidewalls of the storage container, the intake portion of the bottom plate and the sidewalls A backlight unit comprising at least one fan formed in at least one. The backlight unit of claim 14, wherein the through hole is formed through the bottom plate, and the fan is formed on the first side wall. The backlight unit of claim 15, wherein the first sidewall is inclined outward with respect to the bottom plate. The backlight unit of claim 13, further comprising a first driving circuit disposed on any one of the bottom plate and the sidewalls of the storage container to drive the light generator. The backlight unit of claim 12, wherein the light generator is a surface light source device including a light emitting diode light source. 19. The backlight unit of claim 18, wherein the surface light source device further comprises a reflector disposed between the storage container and the light emitting diode light source. A backlight unit including a light generating unit for generating light and an accommodation container accommodating the light generating unit, and an intake unit through which external air is sucked in and an exhaust unit for emitting internal air; And And a liquid crystal display panel which displays an image using light emitted from the light generator. 21. The apparatus of claim 20, wherein the storage container includes a bottom plate and a plurality of side walls, and the intake unit includes one or more through holes formed through at least one of the bottom plate and the side walls, and the exhaust part is And at least one fan formed on at least one of the bottom plate and the sidewalls. 22. The liquid crystal display device according to claim 21, wherein the through hole is formed through the bottom plate, and the fan is formed on the first side wall inclined outward with respect to the bottom plate among the side walls. 23. The liquid crystal display of claim 22, wherein the fan is formed on the sidewalls, and the sidewalls are inclined outward with respect to the bottom plate, respectively. The liquid crystal display of claim 20, wherein the light generating unit is a surface light source device including a light emitting diode light source. 21. The liquid crystal display of claim 20, wherein the first driving circuit unit disposed on any one of the bottom plate and the sidewalls to drive the light generator and the one of the bottom plate and the sidewalls to drive the liquid crystal display panel. The liquid crystal display device further comprises a second driving circuit portion disposed. 26. The apparatus of claim 25, wherein the first driving circuit portion is disposed on a bottom plate of the storage container, and the second driving circuit portion is disposed on a first sidewall inclined outward with respect to the bottom plate among the sidewalls. Liquid crystal display device. A backlight unit including a light generating unit for generating light and an accommodating unit accommodating the light generating unit, an intake unit for sucking external air, and an exhaust unit for discharging internal air; And And a liquid crystal display panel which displays an image by using light emitted from the light generator. 28. The apparatus of claim 27, wherein the storage container includes a bottom plate and a plurality of sidewalls, and the exhaust portion includes one or more through holes formed through at least one of the bottom plate and the sidewalls, and the intake portion is And at least one fan formed on at least one of the bottom plate and the sidewalls.

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