KR101252851B1 - Backlight assembly and liquid crystal display device having the same - Google Patents

Abstract

The present invention discloses a backlight assembly having a heat dissipation structure and a liquid crystal display device having the same. The disclosed backlight assembly includes a bottom case, a printed circuit board disposed in surface contact with an inner surface of the bottom case, and a plurality of light emitting diodes mounted on the printed circuit board.

Bottom Case, Heat Resistant, Light Emitting Diode

Description

BACKLIGHT ASSEMBLY AND LIQUID CRYSTAL DISPLAY DEVICE HAVING THE SAME}

1 is an exploded perspective view showing a liquid crystal display device according to a first embodiment of the present invention.

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

3 is a perspective view showing a bottom case according to a second embodiment of the present invention;

4 is a cross-sectional view of the liquid crystal display according to the second embodiment of FIG. 3.

5 is a perspective view showing a bottom case according to a third embodiment of the present invention.

FIG. 6 is a cross-sectional view of a liquid crystal display according to a third exemplary embodiment of FIG. 5.

7 is a perspective view showing a bottom case according to a fourth embodiment of the present invention.

FIG. 8 is a cross-sectional view of a liquid crystal display according to a fourth exemplary embodiment of FIG. 7.

9 is a perspective view showing a bottom case according to a fifth embodiment of the present invention.

10 is a perspective view showing a printed circuit board according to a fifth embodiment of the present invention.

FIG. 11 is a perspective view illustrating a bottom case and a printed circuit board assembled according to the fifth embodiment of FIGS. 9 and 10.

12 is a perspective view showing a guide panel according to a sixth embodiment of the present invention.

FIG. 13 is a cross-sectional view of a liquid crystal display according to a sixth exemplary embodiment of FIG. 12.

Description of the Related Art [0002]

100: top case 110: liquid crystal panel

120: backlight assembly 130: optical sheet

140, 240: guide panel 150: light emitting diode

151, 251: printed circuit board 153: adhesive pad

170: Light guide plate 180: Reflective plate

190, 191, 192, 193, 194: bottom case

201: 'ㄷ' shape 203, 205: goal

207: Hall 209: Home

209 ': protrusion

The present invention relates to a backlight assembly, and more particularly, to a backlight assembly having a heat dissipation structure and a liquid crystal display device having the same.

Liquid crystal display devices have been used in various fields as well as notebook PC and monitor market due to small size, light weight and low power consumption.

Since the liquid crystal display is a light-receiving device that displays an image by controlling the amount of light coming from the outside, a backlight assembly for irradiating light to the liquid crystal panel is required.

The backlight assembly is classified into an edge type and a direct type according to the shape of the light source. The edge type backlight assembly includes a light guide plate at a side surface and a light guide plate provided at a rear surface of the liquid crystal panel to guide light emitted from the side to the front. The direct type backlight assembly includes a plurality of light sources at the rear of the liquid crystal panel, and the light emitted from the plurality of light sources is directly irradiated to the liquid crystal panel in front of the liquid crystal panel.

As the light source of the backlight assembly, an EL (Electro Luminescence), a Cold Cathode Fluorescent Lamp (CCFL), a Hot Cathode Fluorescent Lamp (HCFL), a light emitting diode (LED), and the like are used.

In the CCFL backlight assembly, mercury encapsulated inside a fluorescent lamp forms an amalgam easily by combining with a metal, thereby degrading the life of the lamp, causing a great change in luminance due to temperature change, and using heavy mercury, which is a heavy metal. The disposal of the waste is a problem.

In order to solve such a problem, a light emitting diode (LED) is used.

In the edge type backlight assembly using the light emitting diodes, a plurality of light emitting diodes are disposed at predetermined intervals on one side of a bottom case, and a light guide plate is disposed in parallel with the light emitting diodes to convert point light into surface light, and is disposed on the light guide plate. Optical sheets for diffusing and condensing light at predetermined intervals are arranged.

The edge type backlight assembly further includes a housing provided to surround the light emitting diode to guide light to the light guide plate.

The light emitting diode has a problem of deteriorating the life of the light emitting diode because heat is generated during driving, and by disposing a separate heat sink, a heat dissipation fin, etc. around the light emitting diode to dissipate the heat, a material cost and a number of processes increase. There was. In addition, since the heat sink and the heat sink fins are disposed on the bottom of the bottom case, there is a big problem in thinning the liquid crystal display device.

It is an object of the present invention to provide a backlight assembly and a liquid crystal display device having the same, which can improve emission of heat generated from a light emitting diode.

In addition, an object of the present invention is to provide a backlight assembly and a liquid crystal display device having the same as a structure that eliminates the heat sink, the heat dissipation fins, and the housing, thereby reducing the material cost and the number of processes.

In order to achieve the above object, a backlight assembly according to an embodiment of the present invention,

Bottom case;

A printed circuit board disposed in surface contact with an inner surface of the bottom case; And

It includes a plurality of light emitting diodes mounted on the printed circuit board.

In addition, the liquid crystal display device according to another embodiment of the present invention,

A printed circuit board disposed in surface contact with an inner surface of the bottom case;

A plurality of light emitting diodes mounted on the printed circuit board; And

It includes a liquid crystal panel for displaying a predetermined image using the light emitted from the light emitting diode.

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

1 is an exploded perspective view illustrating a liquid crystal display device according to a first embodiment of the present invention, and FIG. 2 is a cross-sectional view of the liquid crystal display device taken along the line II ′ of FIG. 1.

3 is a perspective view illustrating a bottom case according to a second embodiment of the present invention, and FIG. 4 is a cross-sectional view of the liquid crystal display according to the second embodiment of FIG.

As shown in FIGS. 1 to 4, the liquid crystal display according to the first and second embodiments of the present invention includes a liquid crystal panel 110 for displaying an image and a backlight for providing light to the liquid crystal panel 110. The assembly 120 and the liquid crystal panel 110 includes a tom case 100 provided in a wrapping form.

The backlight assembly 120 includes bottom cases 190 and 191, a plurality of light emitting diodes 150 disposed at predetermined intervals on side surfaces of the bottom cases 190 and 191, and the bottom cases 190 and 191. A reflection plate 180 applied or attached on the entire inner surface of the light guide plate, a light guide plate 170 disposed to form one surface with the light emitting diode 150, and converting point light into surface light; and a light disposed on the light guide plate 170. And optical sheets 130 for condensing and diffusing.

The backlight assembly 120 further includes a guide panel 140 for accommodating the optical sheet 130, the light guide plate 170, and the reflective plate 180 therein, and the guide panel 140 includes the guide panel 140. It is fastened to the bottom cases 190 and 191.

The plurality of light emitting diodes 150 may be formed of a combination of light emitting diodes 150 emitting red, green, blue, and white light as point light sources.

A printed circuit board 151 having a conductive pattern is disposed on a rear surface of the light emitting diode 150 to supply a driving voltage to the light emitting diode 150.

The printed circuit board 151 may be fixed to the inner side of the bottom cases 190 and 191 by the adhesive pad 153. The adhesive pad 153 is one means for fixing the printed circuit board 151 and the bottom cases 190 and 191. Although not shown in the drawing, the adhesive pad 153 may be changed to a screw or the like.

The inner surface of the bottom case 191 may be in contact with all surfaces except for the surface on which the light emitting diode 150 is mounted by bending the 'C' shape 201.

The contact between the bottom cases 190 and 191 and the printed circuit board 151 as described above is easily performed by conducting heat generated when the light emitting diodes 150 are driven to the bottom cases 190 and 191 exposed from the outside. To heat dissipate.

The reflective plate 180 is disposed on the entire inner surface of the bottom cases 190 and 191, and a guide panel 140 made of a reflective material fastened on the bottom cases 190 and 191 is disposed from the light emitting diodes 150. By reflecting (→) the emitted light to the light guide plate 170, it can serve as a housing that was conventionally provided.

The material of the bottom cases 190 and 191 is not particularly limited, but may be made of aluminum having high thermal conductivity and light characteristics.

In the liquid crystal display device according to the first and second embodiments of the present invention described above, the heat dissipation effect may be maximized by placing the printed circuit board 151 in contact with the inner surfaces of the bottom cases 190 and 191. Therefore, the heat dissipation plate and the heat dissipation fin provided for the heat dissipation are deleted, and the housing provided to guide the light emitted from the light emitting diodes 150 to the light guide plate 170 can be deleted, thereby reducing the material cost and the number of processes. It may have advantageous advantages.

5 is a perspective view illustrating a bottom case according to a third exemplary embodiment of the present invention, and FIG. 6 is a cross-sectional view illustrating a liquid crystal display according to the third exemplary embodiment of FIG. 5.

7 is a perspective view illustrating a bottom case according to a fourth exemplary embodiment of the present invention, and FIG. 8 is a cross-sectional view illustrating a liquid crystal display according to the fourth exemplary embodiment of FIG. 7.

5 to 8, the liquid crystal display of the third and fourth embodiments of the present invention is referred to as the bottom cases 192 and 193 with reference to the liquid crystal display according to the first embodiment of FIGS. 1 and 2. Except for the components will be denoted by the same reference numerals and detailed description thereof will be omitted.

The inner surfaces of the bottom cases 192 and 193 are formed with valleys 203 and 205 recessed in the rear direction of the bottom case 192. The valleys 203 and 205 may be formed at predetermined intervals from side surfaces of the bottom cases 192 and 193 in which the light emitting diodes 150 are disposed, and the printed circuit boards disposed in the bottom cases 192 and 193. It may be formed in parallel with 151.

The valleys 203 and 205 may be integrally formed in the bottom case 192 and 193 manufacturing process, and the shapes of the valleys 203 and 205 may be round and formed in respective shapes.

The valleys 203 and 205 are formed to facilitate heat dissipation by widening the cross-sectional areas of the bottom cases 192 and 193.

When the reflecting plate 180 is attached or coated on the bottom cases 192 and 193, air 300 may be interposed between the reflecting plate 180 and the valleys 203 and 205.

Heat generated when the light emitting diodes 150 are driven may be easily radiated by convection of the air 300 disposed on the valleys 203 and 205.

Holes 207 may be formed at both ends of the valley 205. That is, holes 207 are formed in both end regions of the valley 205 formed in the bottom case 193, so that convection of air may occur through the holes 205 to improve heat release.

In the liquid crystal display according to the third and fourth embodiments of the present invention described above, valleys 203 and 205 are formed in the bottom cases 192 and 193 to widen the cross-sectional area of the bottom cases 192 and 193. The heat dissipation effect may be maximized by using the convection of the air 300 interposed between the valleys 203 and 205 and the reflector 180. Therefore, the heat dissipation plate and the heat dissipation fin, which are provided for heat dissipation, and the housing provided to guide the light emitted from the light emitting diodes 150 to the light guide plate 170 are deleted, thereby reducing the material cost and the number of processes. It may have advantageous advantages.

9 is a perspective view illustrating a bottom case according to a fifth embodiment of the present invention, FIG. 10 is a perspective view illustrating a printed circuit board according to a fifth embodiment of the present invention, and FIG. 11 is a view of FIGS. 9 and 10. 5 is a perspective view illustrating a bottom case and a printed circuit board assembled according to the fifth embodiment.

9 to 11, the liquid crystal display according to the fifth embodiment of the present invention refers to the bottom case 194 and the printed circuit with reference to the liquid crystal display according to the first embodiment of FIGS. 1 and 2. Components other than the substrate 251 are denoted by the same reference numerals and detailed description thereof will be omitted.

The bottom case 194 is formed with a plurality of grooves 209 having a shape recessed in one inner wall surface.

The plurality of grooves 209 may be integrally formed at the time of manufacturing the bottom case 194, and the groove 209 may have a triangular shape. Although not shown, the shape of the groove 209 may be changed into various shapes such as a round shape, a square shape, and the like.

The printed circuit board 251 has a plurality of prism-shaped protrusions 209 'formed on one surface thereof. The plurality of protrusions 209 ′ may be formed to correspond to the grooves 209 and may be integrally formed during the manufacturing process of the printed circuit board 251.

One surface of the printed circuit board 251 having the plurality of protrusions 209 ′ contacts the inner surface of the bottom case 194 having the plurality of grooves 209 formed therein, and an adhesive pad 153 or a screw. Or the like. In this case, it can be seen that the protrusion 209 ′ is in surface contact with the groove 209.

The plurality of protrusions 209 ′ and the plurality of grooves 209 are formed in order to improve thermal conduction by widening the contact area between the printed circuit board 251 and the bottom case 194.

The liquid crystal display according to the fifth exemplary embodiment of the present invention described above is formed such that a plurality of grooves 209 and a plurality of protrusions 209 'correspond to contact surfaces of the bottom case 194 and the printed circuit board 251. By widening the contact area, heat conduction can be improved. Therefore, the heat dissipation of the liquid crystal display device having the light emitting diodes 150 can be maximized with a simple structure.

FIG. 12 is a perspective view illustrating a guide panel according to a sixth embodiment of the present invention, and FIG. 13 is a cross-sectional view of a liquid crystal display according to the sixth embodiment of FIG. 12.

12 and 13, the liquid crystal display according to the sixth embodiment of the present invention is a component except for the guide panel 240 with reference to the liquid crystal display of the first embodiment of FIGS. 1 and 2. The same code | symbol is written together and detailed description is abbreviate | omitted.

The guide panel 240 is made of a metal material having excellent thermal conductivity such as aluminum.

The guide panel 240 accommodates the light emitting diode 150, the reflecting plate 180, the light guide plate 170, and the optical sheets 130 disposed on the bottom case 190 and the side surface of the bottom case 190. Is fastened.

Although the fastening of the guide panel 240 and the bottom case 190 is not shown in detail, a fastening protrusion formed on the inside of the guide panel 240 and a groove formed on the outside of the bottom case 190 corresponding to the fastening protrusion Or it can be completed by fastening the hole. Alternatively, the guide panel 240 and the bottom case 190 may be formed with a hole penetrating through the side surface and fastened by a screw or the like.

The liquid crystal panel 110 is disposed on the guide panel 240. The top case 100 surrounding the guide panel 240 and the liquid crystal panel 110 and the guide panel 240 are fastened to complete the assembly of the liquid crystal display. The top case 100 and the guide panel 240 may be fastened in a similar manner to the fastening of the guide panel 240 and the bottom case 190.

As described above, the guide panel 240 is made of a metal material having excellent thermal conductivity, and is in contact with the bottom case 190 and the top case 100 made of a metal material, and the heat is conducted from the printed circuit board 151. Maximize emissions.

The liquid crystal display according to the sixth exemplary embodiment of the present invention described above includes a guide panel 240 made of a metal material having excellent thermal lowness, and transmits heat conducted from the light emitting diodes 150 to the printed circuit board 151 and the bottom case. The heat dissipation may be improved by widening an area that may be discharged to the outside through the 190, the guide panel 240, and the top case 100.

Accordingly, the liquid crystal display device of the first to sixth embodiments of the present invention has a simple structure, and may reduce the material cost and the number of processes by eliminating the heat sink, the heat sink fin, and the housing, and at the same time, maximize the heat dissipation.

As described above, the present invention has a structure of contacting the inner surface of the bottom case and the printed circuit board on which the light emitting diode is mounted, thereby improving heat dissipation.

In addition, the present invention has the effect of improving the release of heat by forming a valley in the bottom case to widen the area of the bottom case.

In addition, the present invention forms a plurality of grooves on the inner surface of the bottom case, by forming a plurality of protrusions on one surface of the printed circuit board corresponding to the grooves to widen the contact surface of the bottom case and the printed circuit board, the release of heat Has the effect of improving.

In addition, the present invention includes a guide panel made of a metal material having excellent thermal conductivity to expand the area that can be radiated heat from the light emitting diode to the outside through the printed circuit board, the bottom case, the guide panel and the top case, Can improve.

In addition, the present invention has the effect that by eliminating the heat sink, the heat radiation fins and the housing, the re-ratio and the number of processes, and advantageous in thinning.

Those skilled in the art through the above description will be capable of various changes and modifications without departing from the spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be defined by the claims.

Claims (13)

Bottom case; A printed circuit board disposed in surface contact with an inner surface of the bottom case; A plurality of light emitting diodes mounted on the printed circuit board; And A guide panel disposed on the bottom case and fastened to the bottom case; And the guide panel is made of a reflective metal material. The method of claim 1, The side of the bottom case on which the printed circuit board is disposed is a backlight assembly, characterized in that the '' 'made of a shape. The method of claim 1, And an adhesive pad between the bottom case and the printed circuit board to fix the bottom case and the printed circuit board. The method of claim 1, The inner surface of the bottom case, the backlight assembly, characterized in that the reflecting plate is applied or attached. The method of claim 1, The front case of the bottom case is recessed in the rear direction of the bottom case, the backlight assembly, characterized in that formed at least one valley extending in the longitudinal direction of the printed circuit board. 6. The method of claim 5, The valley is integrally formed with the bottom case, the backlight assembly, characterized in that made of any one of a round shape and an angular shape. 6. The method of claim 5, The reflector is disposed on the bottom case, the backlight assembly, characterized in that the air is interposed between the reflector and the valley. 6. The method of claim 5, And a hole is formed at both ends of the bone. The method of claim 1, The inner surface of the bottom case is formed with a plurality of grooves of the recessed shape, the backlight assembly, characterized in that a plurality of protrusions formed on one surface of the printed circuit board corresponding to the groove. The method of claim 9, And the grooves and the protrusions are formed in shapes corresponding to each other. delete A printed circuit board disposed in surface contact with an inner surface of the bottom case; A plurality of light emitting diodes mounted on the printed circuit board; A guide panel disposed on the bottom case and formed of a reflective metal material coupled to the bottom case; And And a liquid crystal panel displaying a predetermined image by using light emitted from the light emitting diodes. The method of claim 1, And an inner surface of the guide panel is spaced apart from the light emitting diode.

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