KR20080065143A - Backlight assembly - Google Patents

Abstract

A backlight assembly is provided to manufacture divided type low chassis through an extrusion molding method, thereby reducing molding manufacturing costs and accordingly reducing backlight assembly manufacturing costs. At least a couple of divided type low chassis(200a,200b) comprises upper surfaces(210a,210b), outer surfaces(270a,270b), first mount tables(230a,230b), inner surfaces and bottom surfaces(260a,260b). The inner surface includes inclined surfaces(240a,240b) prolonged from the first mount table as being downwardly inclined. The low chassis is made from metal. A heat blocking plate is mounted on the first mount table. One or more lamps are disposed in a lower part of the heat blocking plate. A reflection sheet is disposed in a lower part of the lamp, and comprises a bottom reflection surface and at least a couple of first side reflection surfaces. The first side reflection surfaces are prolonged from the bottom incline surface as being upwardly inclined and face each other. In a bottom plate, the divided type low chassis, the lamps and the reflection sheet are disposed.

Description

Backlight Assembly

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

2 is a perspective view of a split low chassis included in a backlight assembly according to a first exemplary embodiment of the present invention.

3 is a cross-sectional view of the backlight assembly taken along the line AA ′ of FIG. 1.

4 is a cross-sectional view of the backlight assembly taken along the line BB ′ of FIG. 1.

5 is an exploded perspective view of a backlight assembly according to a second embodiment of the present invention.

6 is a perspective view of a split row chassis and a split row mold included in the backlight assembly according to the second exemplary embodiment of the present invention.

FIG. 7 is a cross-sectional view of the backlight assembly taken along the line CC ′ of FIG. 5.

(Explanation of symbols for the main parts of the drawing)

100, 101: backlight assembly 110: lamp

120: heat shield plate 130: diffusion plate

140: optical sheet 150: reflective sheet

162: support 170: bottom plate

180: middle mold 200a, 200b: split type low chassis

210a, 210b: upper surface 220a, 220b: second seating end

230a, 230b: 1st mounting end 240a, 240b: inclined surface

250a, 250b: fixed end 270a, 270b: outer side

280a, 280b: hollow space in split low chassis

300: split row mold 310: side wall

320: second support end 330: first support end

340: reflection unit 345: lamp insertion hole

350: support

TECHNICAL FIELD The present invention relates to a backlight assembly, and more particularly, to a backlight assembly in which a mold cost required for manufacturing a part is reduced.

Liquid crystal display (LCD) is one of the most widely used flat panel display (FPD), and consists of two substrates on which electrodes are formed and a liquid crystal layer interposed therebetween. A display device adjusts the amount of light transmitted by rearranging liquid crystal molecules of a liquid crystal layer by applying a voltage to an electrode.

As the modern society is highly informationized, such liquid crystal displays face the market demand for larger size and thinner, and have a size of 40 inches or more such as a digital information display (DID) used for outdoor advertising. The demand for is increasing.

As the demand for ultra-large liquid crystal display devices such as DID increases, the size of the backlight assembly located on the rear side of the liquid crystal display panel is increasing in size to supply light to the large screen liquid crystal display panel. Accordingly, the components included in the backlight assembly may also be enlarged to increase the size of the mold used to manufacture the components, and increase manufacturing costs.

Therefore, it is necessary to reduce the size of the mold required for manufacturing the components included in the backlight assembly and to reduce the manufacturing cost of the components.

It is an object of the present invention to provide a backlight assembly with reduced manufacturing costs.

Technical problems of the present invention are not limited to the above-mentioned technical problems, other technical problems not mentioned will be clearly understood by those skilled in the art from the following description.

According to an aspect of the present invention, there is provided a backlight assembly including an upper surface, an outer surface, a first seating end, and an inner side including an inclined surface extending downward to be inclined downward from the first seating end. At least one pair of split low chassis made of metal, a thermal barrier plate seated on the first seating end, one or more lamps disposed below the thermal barrier plate, and a bottom half of the lamp; A reflecting sheet extending to be inclined upwardly from a slope and the bottom reflecting surface and including at least one pair of first side reflecting surfaces facing each other, and a bottom plate on which the divided low chassis, the lamp, and the reflecting sheet are disposed; It includes.

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but can be implemented in various different forms, and only the embodiments make the disclosure of the present invention complete, and the general knowledge in the art to which the present invention belongs. It is provided to fully inform the person having the scope of the invention, which is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

When elements or layers are referred to as "on" or "on" of another element or layer, intervening other elements or layers as well as intervening another layer or element in between It includes everything. On the other hand, when a device is referred to as "directly on" or "directly on" indicates that no device or layer is intervened in the middle. “And / or” includes each and all combinations of one or more of the items mentioned.

The spatially relative terms " below ", " beneath ", " lower ", " above ", " upper " It may be used to easily describe the correlation of a device or components with other devices or components. Spatially relative terms are to be understood as including terms in different directions of the device in use or operation in addition to the directions shown in the figures.

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

1 to 4, a backlight assembly according to a first embodiment of the present invention will be described in detail. 1 is an exploded perspective view of a backlight assembly according to a first embodiment of the present invention.

Referring to FIG. 1, the backlight assembly 100 according to the first exemplary embodiment of the present invention generally includes a lamp 110, a heat shield plate 120, a diffusion plate 130, an optical sheet 140, and a reflective sheet 150. ), The bottom plate 170, the middle mold 180, and the split low chassis 200a and 200b.

In addition, the backlight assembly 100 according to the present exemplary embodiment may further include a supporter 162 fixed to the bottom plate 170 to support the diffusion plate 130.

As the lamp 110 of the present embodiment, a light emitting diode (LED), a cold cathode fluorescent lamp (CCFL), an external electrofluorescent lamp (EEFL), or the like may be used. CCFLs may be exemplified as the lamp 110 of the present embodiment, and they have a shape extending in the horizontal direction of the liquid crystal display device 100. In the present specification, the horizontal direction refers to a direction parallel to the long side of the liquid crystal display 100. In addition, the vertical direction refers to a direction parallel to the short side of the liquid crystal display 100. The lamp 110 may be configured as a direct type spaced apart at a uniform distance and connected in phase in parallel.

The heat shield plate 120 is additionally required for a liquid crystal display (not shown) that is used outdoors, for example, such as a DID. The heat shield plate 120 is disposed on the upper portion of the lamp 110, specifically, between the lamp 110 and the diffuser plate 130, which will be described later, in the air layer interposed between the heat shield plate 120 and the diffuser plate 130. As a result, heat transfer to the diffusion plate 130 side is blocked. The thermal barrier plate 120 is seated on the divided low chassis 200a and 200b to be described later.

The diffusion plate 130 is disposed above the thermal barrier plate 120 to diffuse light emitted from the lamp 110 to improve luminance uniformity. The diffusion plate 130 may be provided by mixing the diffusion material on the transparent resin plate in order to make the luminance uniform. As a material of the transparent resin plate, for example, acrylic or polycarbonate may be used, and as the diffusion material, for example, crosslinked polymethylmethacrylate, crosslinked polystyrene, crosslinked polyacrylate, crosslinked silicone, crosslinked acrylic Fine particles such as styrene copolymer, calcium carbonate and barium sulfate can be used, but the material of the transparent resin plate or the diffusion material is not limited thereto. The diffusion plate 130 may also be mounted on the split low chassis 200a and 200b.

In the case of a large DID, the diffusion plate 130 is also large, so that the central portion of the diffusion plate 130 is supported by the support 162 in order to prevent a sagging phenomenon from occurring in the central portion of the diffusion plate 130. A through hole (not shown) may be formed in the thermal barrier plate 120 so that one end of the support 162 contacts the one surface of the diffusion plate 130 to support the diffusion plate 130.

The optical sheet 140 is installed under the top chassis 110 and serves to diffuse and collect light transmitted from the lamp 110. The optical sheet 140 includes a diffusion sheet, a first prism sheet, a second prism sheet, and the like.

The optical sheet 140 may be provided in a planar sheet shape, and may be disposed in the divided low chassis 200a and 200b together with the diffusion plate 130.

The reflective sheet 150 is disposed under the lamp 110 and reflects a part of the light emitted from the lamp 110 to the upper part of the bottom plate 170 without being directed to the viewer side.

The reflective sheet 150 may be manufactured by dispersing a white pigment such as titanium oxide in a synthetic resin sheet, and bubbles for scattering light may be dispersed in the synthetic resin sheet.

The reflective sheet 150 includes, for example, a rectangular bottom reflective surface 151 and an at least one pair of first side reflective surfaces 152 extending upwardly inclined from the bottom reflective surface 151 and facing each other. can do. The first side reflecting surface 152 prevents light from being lost to the side of the backlight assembly 100. The first side reflective surface 152 may be disposed in parallel to the long side of the bottom plate 170 to face each other, and may be disposed in parallel to the short side of the bottom plate 170 and to face each other. A hole (not shown) through which the lamp 110 passes may be formed in the first side reflective surface 152 disposed parallel to the short side of the bottom plate 170.

The reflective sheet 150 of the present embodiment may further include a flow preventing part 153 to prevent the flow of the reflective sheet 150. The flow preventing part 153 extends from one end of the first side reflecting surface 152 and is disposed between the first seating ends 230a and 230b and the thermal barrier plate 120 of the divided low chassis 200a and 200b described later. It is interposed to prevent the flow of the reflective sheet 150.

The reflective sheet 150 may further include at least a pair of second side reflective surfaces 154 that reflect light passing through the thermal barrier plate 120 to prevent light from being lost to the side of the backlight assembly 100. Can be. The second side reflecting surface 154 is formed to extend upwardly inclined from the flow preventing part 153.

The bottom plate 170 may have a flat plate shape, and the lamp 110, the reflective sheet 150, and the divided low chassis 200a and 200b described later are disposed on the bottom plate 170.

A support 162 for supporting the diffusion plate 130 and a socket 164 into which the lamp 110 is inserted are disposed on the bottom surface of the bottom plate 170. Sidewalls (not shown) may be separately disposed at the edges of the bottom plate 170. Alternatively, the sidewalls of the bottom plate 170 are not disposed, and the lower row chassis 200a is divided along the edge of the bottom plate 170. , 200b may be disposed to serve as a sidewall of the bottom plate 170. The socket 164 may be disposed inside the side wall of the bottom plate 170 and the lower chassis 200b of one side.

The middle mold 180 serves to protect the above-described parts. The middle mold 180 may be hooked and / or screwed with the sidewalls or the split row chassis 200a and 200b of the bottom plate 170.

Hereinafter, referring to FIGS. 1 to 4, the divided low chassis 200a and 200b of the present embodiment will be described in detail. 2 is a perspective view of a split low chassis included in a backlight assembly according to a first exemplary embodiment of the present invention. 3 is a cross-sectional view of the backlight assembly taken along the line AA ′ of FIG. 1. 4 is a cross-sectional view of the backlight assembly taken along the line BB ′ of FIG. 1.

1 and 2, the divided low chassis 200a and 200b are formed along a short side of the pair of divided low chassis 200a and the backlight assembly 100 disposed along the long side of the backlight assembly 100. Another pair of split low chassis 200b is disposed.

Each of the divided low chassis 200a and 200b is inclined downward from the top surfaces 210a and 210b, the outer surfaces 270a and 270b, the first seating ends 230a and 230b and the first seating ends 230a and 230b. An inner surface including extended inclined surfaces 240a and 240b, and bottom surfaces 260a and 260b.

The first seating ends 230a and 230b protrude inwardly of the split low chassis 200a and 200b and are formed in parallel with the bottom plate 170. The thermal barrier plate 120 is seated on the first seating ends 230a and 230b.

The inclined surfaces 240a and 240b extending downward from one end of the first seating ends 230a and 230b serve to support the first side reflective surface 152 of the reflective sheet 150. That is, the inclined surfaces 240a and 240b serve to maintain the inclination angle of the first side reflective surface 152.

The split row chassis 200a and 200b may further include second seating ends 220a and 220b and fixed ends 250a and 250b.

The second seating ends 220a and 220b are formed to have a step with the top surfaces 210a and 210b and are disposed on the first seating ends 230a and 230b, and the second seating ends 220a and 220b and the first seating. The stages 230a and 230b protrude inwardly of the split row chassis 200a and 200b and are formed stepwise.

The diffusion plate 130 and the optical sheet 140 are seated on the second mounting ends 220a and 220b. As described above, since the air layer disposed between the diffusion plate 130 and the heat shield plate 120 serves to block heat, it is preferable that the thickness of the air layer be an optimal thickness to block heat. Accordingly, the first seating ends 230a and 230b and the second seating ends 220a and 220b are preferably spaced apart at intervals suitable for blocking heat.

The portions extending from the second seating ends 220a and 220b to the top surfaces 210a and 210b are bent to press the diffuser plate 130 and the optical sheet 140 seated on the second seating ends 220a and 220b. It can also be fixed.

The fixed ends 250a and 250b are formed at the boundary between the bottom surfaces 260a and 260b and the inner surface to serve to fix the divided lower chassis 200a and 200b at the edges of the bottom plate 170. To this end, fastening grooves 255a and 255b may be provided at the fixed ends 250a and 250b.

The bottom surfaces 260a and 260b support the split row chassis 200a and 200b so that the split row chassis 200a and 200b are not deformed by an external force.

Hooks (not shown) for coupling with the middle mold 180 may be formed on the outer surfaces 270a and 270b.

The divided low chassis 200a and 200b may be provided in a bar shape as a whole. The divided low chassis 200a and 200b may be hollow split low chassis 200a and 200b having an empty inside along a long side of a bar shape in order to prevent an excessive increase in the load of the backlight assembly 100. . That is, the divided low chassis 200a and 200b are formed such that the upper surfaces 210a and 210b, the inner surface, the bottom surfaces 260a and 260b and the outer surfaces 270a and 270b form a single closed curve. Except for the portion having a thickness, the hollow spaces 280a and 280b of the hollow hollow chassis may be reduced to reduce the material cost and the load of the split raw chassis 200a and 200b.

When the divided low chassis 200a and 200b of the present embodiment are manufactured by the injection molding method, a large mold corresponding to the size of the divided low chassis 200a and 200b is required and the mold manufacturing cost is increased. It can manufacture. The divided low chassis 200a, 200b of this embodiment is required to be made of a material having rigidity for seating a plurality of parts and suitable for the extrusion molding method. The split low chassis 200a, 200b is preferably made of a metal material, for example aluminum or SUS (stainless steel). As such, as the divided low chassis 200a and 200b are manufactured by the extrusion method, the mold manufacturing cost is reduced, and as a result, the manufacturing cost of the backlight assembly 100 can be reduced.

3 and 4, the split type low chassis 200a and 200b include the fixed ends 250a and 250b described above, and the fastening means 258a and 258b are coupled to the fastening grooves 255a and 255b. The divided low chassis 200a and 200b are fixed to the edge of the bottom plate 170. The split row chassis 200a and 200b may function as sidewalls of the bottom plate 170.

Meanwhile, since the divided low chassis 200a and 200b of the present exemplary embodiment are not made of a highly reflective material, the reflective sheet 150 may include the first side reflecting surface 152 and / or the first to reflect light reflection efficiency. Two side reflective surfaces 154. Accordingly, the light emitted from the lamp 110 may be prevented from being lost to the side of the backlight assembly 100.

According to the backlight assembly 100 according to the present exemplary embodiment, since the divided low chassis 200a and 200b are manufactured and divided into bar shapes, the manufacturing of the divided low chassis 200a and 200b may be easy and the manufacturing cost may be reduced.

Hereinafter, the backlight assembly according to the second exemplary embodiment of the present invention will be described in detail with reference to FIGS. 5 to 7. 5 is an exploded perspective view of a backlight assembly according to a second embodiment of the present invention. 6 is a perspective view of a split row chassis and a split row mold included in the backlight assembly according to the second exemplary embodiment of the present invention. FIG. 7 is a cross-sectional view of the backlight assembly taken along the line CC ′ of FIG. 5. For convenience of description, members having the same functions as the members shown in the drawings of the previous embodiment are denoted by the same reference numerals, and therefore description thereof is omitted. As shown in FIG. 5, the backlight assembly 101 according to the present exemplary embodiment basically has the same structure as the backlight assembly 100 according to the previous exemplary embodiment except for the following. That is, the backlight assembly 101 according to the present exemplary embodiment further includes a pair of divided row molds 300 disposed parallel to the short sides of the bottom plate 170 and facing each other.

Referring to FIG. 5, in the backlight assembly 101 according to the second exemplary embodiment of the present invention, divided low chassis 200a and 200b are disposed parallel to the long side of the bottom plate 170, and parallel to the short side of the bottom plate. Split row mold 300 is disposed. The pair of divided row molds 300 are disposed parallel to the short sides of the bottom plate 170 to face each other. That is, the pair of divided low chassis 200a and 200b disposed in the short side direction of the bottom plate 170 among the divided low chassis 200a and 200b of the previous embodiment is divided into the low mold 300 in this embodiment. Is replaced by. The split row mold 300 may be disposed at an edge of the bottom plate 170. If the side wall of the bottom plate 170 is provided separately, the divided row mold 300 may be disposed inside the side wall.

The split row mold 300 is easy to process and may be made of a polymer resin having reflective properties. The split row mold 300 made of a polymer resin may be manufactured by an injection molding method.

The split row mold 300 includes a sidewall 310, a first support end 330 protruding inwardly from the sidewall, a reflector 340 and a reflector 340 extending downward from the first support end 330. Lamp insertion hole 345 formed in the).

The first support end 330 protrudes in parallel to the bottom plate 170 from the side wall 310 to seat the heat shield plate 120.

The reflector 340 serves to prevent the light emitted from the lamp 110 from being lost to the side of the backlight assembly 101.

Since the split row mold 300 itself includes a reflector 340, the first side reflecting surface 152 ′ of the reflecting sheet 150 ′ may be formed only at a position where the reflector 340 is not disposed. have. That is, the first side reflective surfaces 152 ′ facing each other may be disposed in parallel to the long side of the bottom plate 170, and may not be formed on the short side of the bottom plate 170. The split row mold 300 may further include a support 350 to be stably disposed on the bottom plate 170.

The reflective sheet 150 ′ of the present exemplary embodiment may include a bottom reflective surface 151 ′, a first side reflective surface 152 ′, a flow preventing part 153 ′, and a second side reflective surface 153 ′. The second side reflecting surface 153 ′ may be formed only on the same side as the first side reflecting surface 151 ′, that is, the long side of the bottom plate 170.

In addition, a lamp insertion hole 345 is formed in the reflector 340, and an end of the lamp 110 is disposed behind the reflector 340, that is, between the reflector 340 and the sidewall 310. Since the split row mold 300 is made of a polymer resin material which is softer than metal, it is easy to form the lamp insertion hole 345.

The split row mold 300 may further include a second support end 320 protruding from the sidewall 310 and disposed on the first support end 330. The second support end 320 may be formed in parallel with the first support end 330, and the diffusion plate 130 and the optical sheet 140 may be seated on the second support end 320.

The length of the second support end 320 protruding from the side wall 310 is such that the first support end 330 protrudes from the side wall 310 so as to easily seat the thermal barrier plate 120 on the first support end 330. It is preferred to be shorter than the length specified. In addition, the first support end 330 and the second support end 320 are formed with a predetermined height difference so that the heat shield plate 120 and the diffusion plate 130 are arranged at an optimal interval to perform an efficient heat shield. .

The pair of split row molds 300 support the diffusion plate 130 and the heat shield plate 120 together with the pair of split row chassis 200a and 200b disposed parallel to the long sides of the bottom plate 170. do. As a result, the thermal barrier plate 120 is seated on the first support end 330 of the split row mold 300 and the first seating ends 230a and 230b of the split row chassis 200a and 200b. In addition, the diffusion plate 130 is mounted on the second support end 320 of the split row mold 300 and the second seating ends 220a and 220b of the split row chassis 200a and 200b.

Although embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains may implement the present invention in other specific forms without changing the technical spirit or essential features thereof. I can understand that. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive.

As described above, according to the backlight assembly according to the present invention, it is possible to reduce the manufacturing cost of the backlight assembly by reducing the mold cost used in manufacturing the low chassis.

Claims (14)

At least a pair of divided low chassis comprising an upper surface, an outer surface, a first seating end, and an inner side including an inclined surface extending downwardly inclined from the first seating end, and a bottom surface, the bottom surface comprising a metal; A heat shield plate seated on the first seating end; At least one lamp disposed under the thermal barrier plate; A reflecting sheet disposed below the lamp, the reflecting sheet extending to be inclined upwardly from the bottom reflecting surface, and including at least a pair of first side reflecting surfaces facing each other; And And a bottom plate on which the split low chassis, the lamp, and the reflective sheet are disposed. According to claim 1, The split low chassis has a bar shape, The split low chassis is a hollow hollow backlight assembly along the long side of the bar shape. According to claim 1, The inner surface further includes a second seating end formed to have a step with the upper surface and disposed above the first seating end, And the second seating end and the first seating end protrude inwardly of the split low chassis to form a staircase. The method of claim 3, wherein And a diffuser plate mounted on the second seating end. According to claim 1, The divided low chassis further includes a fixed end formed at a boundary between the bottom and the inner surface to fix the divided low chassis to an edge of the bottom plate. According to claim 1, The split low chassis is a backlight assembly made of aluminum or SUS. According to claim 1, The reflective sheet further includes a flow preventing portion extending from the first side reflection surface and interposed between the first seating end and the thermal barrier plate to prevent the flow of the reflective sheet. The method of claim 7, wherein The reflective sheet further includes at least a pair of second side reflection surfaces extending to be inclined upward from the flow preventing portion to reflect light passing through the heat shield plate. According to claim 1, The split type low chassis includes a pair disposed in parallel to the long side of the bottom plate to face each other and a pair disposed in parallel to the short side of the bottom plate to face each other. The method of claim 9, The first side reflection surface is a backlight assembly comprising a pair disposed in parallel to the long side of the bottom plate facing each other and the other pair disposed in parallel to the short side of the bottom plate facing each other. According to claim 1, And at least one pair of divided row molds including a sidewall, a first support end protruding inwardly from the sidewall, a reflector extending downwardly inclined from the first support end, and a lamp insertion hole formed in the reflector. and, The pair of divided low chassis are disposed in parallel to the long side of the bottom plate to face each other, And the pair of divided row molds are disposed parallel to the short sides of the bottom plate to face each other. The method of claim 11, wherein The inner surface further includes a second seating end formed to have a step with the upper surface and disposed above the first seating end, The second seating end and the first seating end protrude inwardly of the divided low chassis and are formed in a step shape. The split row mold further includes a second support end protruding from the sidewall and disposed on the first support end. The method of claim 12, And a diffuser plate mounted on the second seating end and the second support end. The method of claim 11, wherein The pair of first side reflection surfaces are disposed parallel to the long sides of the bottom plate to face each other.

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