KR20220014379A - Cover-bottom for Backlight unit, manufacturing method of that and Backlight unit having the same - Google Patents

Abstract

The present invention relates to a cover-bottom for a backlight device, a manufacturing method thereof, and a backlight device including the cover-bottom. The cover-bottom for the backlight device of an embodiment of the present invention comprises: a bottom unit; a press unit consisting of an insert unit in which an edge of the bottom unit is formed to be bent on one side; and a molding unit coupled while covering the insert unit. The press unit and the molding unit are integrally formed with insert molding.

Description

Cover-bottom for backlight device, manufacturing method thereof, and backlight device including same

The present invention discloses a cover bottom for a backlight device, a method for manufacturing the same, and a backlight device including the same.

In general, a display device is a device that receives and displays an image signal, and includes a TV or a monitor, and as a means for displaying an image, a liquid crystal display device (LCD), an organic light emitting device (OLED) Various devices such as emitting display) and plasma display panel (PDP) are being used.

Unlike other display devices, LCD does not emit light by itself, and thus requires a separate external light source to realize high-quality images. Therefore, the LCD further includes a backlight device of a surface light source in addition to the liquid crystal panel, and the backlight device uniformly supplies a high-brightness light source to the liquid crystal panel, thereby realizing a high-quality image. As described above, the backlight device refers to a surface lighting device for realizing an image of a non-emission type display device such as LCD, and is classified as a direct lighting type or edge lighting type backlight device depending on the location of the light source. are separated A light emitting diode (hereinafter referred to as 'LED') having advantages such as small size, low power consumption, and high reliability is mainly used as a light source of the backlight device.

The direct backlight device is advantageous for realizing a large screen backlight device in a way that a plurality of LED light sources are disposed on a flat substrate to provide direct light, while the side-type backlight device has an LED light source disposed on the side of the light guide plate and passes through the light guide plate. The method of providing light is advantageous for implementing a slim-type backlight device.

1 and 2 are cross-sectional views illustrating a direct type backlight device according to the related art. The direct backlight device includes a cover bottom 10, a light source module 20 disposed within the cover bottom, a diffusion plate 30 disposed on the upper portion while being spaced apart from the light source module by a predetermined distance, and an optical sheet 40 stacked on the top surface of the diffusion plate. and a guide panel 50 fastened to the cover bottom to fix the diffuser plate and the optical sheet. In a backlight device employing an LED as a light source, the diffusion plate 30 is essentially provided so that the point light source is not visually recognized, and a light mixing space (S) with a sufficient interval between the light source module 20 and the diffusion plate 30 . This should be secured

For this purpose, as shown in FIG. 1 , the conventional backlight device secures the light mixing space S inside the vertical sidewall 11 of the cover bottom 10 and further includes a support main 60 for maintaining it. do. The support main 60 supports the diffusion plate 30 to maintain an appropriate distance between the light source module 20 and the diffusion plate 30 . Such a conventional backlight device has a complicated structure, since a separate component such as the support main 60 must be further combined to maintain the light mixing space S between the light source module 20 and the diffusion plate 30 , There are disadvantages in that manufacturing cost increases, parts management is difficult, and assembly efficiency is lowered.

In addition, in another conventional backlight device, as shown in FIG. 2 , a separate seating surface 12 is formed on the cover bottom 10 , and the edge of the diffusion plate 30 is seated on the seating surface 12 . By assembling, a method for securing a light mixing space S with a predetermined interval between the light source module 20 and the diffusion plate 30 is proposed. Such a backlight device has an advantage that a separate component is not required. However, since the seating surface 12 of the cover bottom 10 must have a predetermined width W in order for the diffusion plate 30 to be stably seated, the bezel area is expanded, which is disadvantageous in implementing the narrow bezel.

The present invention has been proposed to solve the above problems, and an object of the present invention is to maintain the distance between the light source module and the diffusion plate, and to reduce the number of parts to simplify the structure and assembly process, and to reduce the bezel area. It is to provide a cover bottom of a backlight device that can be used and a method for manufacturing the same.

The cover bottom for a backlight device of this embodiment for achieving the above object includes a bottom portion, a press portion comprising an insert portion formed by bending an edge of the bottom portion to one side, and a molding portion coupled while surrounding the insert portion Including, the press part and the molding part are integrally formed by insert molding.

In the cover bottom of this embodiment, the molding part includes a coupling part surrounding the inside and outside of the insert part, a guide part providing a seating surface at an upper portion of the coupling part, and a shielding part extending upwardly of the guide part from the coupling part upper part. may include

In addition, in the cover bottom of the present embodiment, the molding part may further include a fastening protrusion formed to protrude from the outer surface of the coupling part.

In addition, in the cover bottom of this embodiment, the insert part may further include a connecting part that forms a through hole penetrating the inner and outer surfaces, and the molding part is filled in the through hole to connect the coupling part of the inner and outer surfaces of the insert part. .

And in the method for manufacturing a cover bottom for a backlight device of this embodiment for solving the above problems, (a) a press process for a plate, forming a press part having a bottom part and an insert part in which an edge of the bottom part is bent to one side and, (b) an insert molding process using the insert water as insert water, and may include forming a molding unit integrally formed with the press unit.

In the method of manufacturing a cover bottom of this embodiment, the step (b) includes a coupling part surrounding the inside and outside of the insert part, a guide part formed on the coupling part upper part, and the guide part extending upward from the coupling part upper part. The molding part may be formed to have a shielding part.

In addition, in the method of manufacturing the cover bottom of this embodiment, the step (a) forms a through hole penetrating the insert part inside and outside, and the step (b) includes a connection part for connecting the coupling part on the inner and outer surfaces of the insert part. The molding part may be formed to fill the through hole.

And the backlight device of this embodiment for solving the above problems, a bottom portion, an insert portion formed by bending the edge of the bottom portion to one side, and the insert portion integrally with the insert portion through a molding process using the insert water A cover bottom including a molding part formed therein, a light source module disposed in a receiving space inside the cover bottom, a diffusion plate having an edge supported by the molding part and disposed on the light source module, an optical sheet laminated on the diffusion plate; and a guide panel fastened along an edge of the cover bottom.

The cover bottom for the backlight device of this embodiment has an effect that the press part made of a metal material and the molding part made of a resin material are integrally combined, so that the structure is simple as a single part, and management and assembly are easy.

In addition, in the cover bottom for the backlight device of the present embodiment, a gap is not formed between the press part and the molding part, which is advantageous in reducing the bezel width.

In addition, in the cover bottom for the backlight device of the present embodiment, since the molding part reinforces the rigidity of the insert part, the thickness of the press part made of the metal plate may be reduced.

In addition, the vertical sidewall of the cover bottom for the backlight device of the present embodiment is formed of a molding part, so that the degree of freedom in shape is improved.

In addition, in the cover bottom for the backlight device of the present embodiment, a through hole is formed in the insert part, so that the bonding force between the press part and the molding part is improved and permanent coupling is possible.

1 is a cross-sectional view showing an example of a backlight device according to the prior art.
2 is a cross-sectional view showing another example of a backlight device according to the prior art;
3 is a cross-sectional view showing a backlight device according to the present embodiment;
4 is a cross-sectional view showing a cover bottom for a backlight device according to the present embodiment;
5 is a process diagram illustrating a manufacturing process of a cover bottom for a backlight device according to the present embodiment.

The present invention and the technical problems achieved by the practice of the present invention will be made clear by the preferred embodiments described below. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

It should be understood that the differences between the embodiments described below are not mutually exclusive. That is, without departing from the spirit and scope of the present invention, the specific shapes, structures and characteristics described may be implemented in other embodiments with respect to one embodiment, and the location of individual components within each disclosed embodiment Alternatively, it should be understood that the arrangement may be changed, and similar reference numerals in the drawings refer to the same or similar functions over several aspects, and the length, area, thickness, and the like may be exaggerated for convenience. In the description of the present embodiment, expressions such as first, second, inner, outer, upper, lower, etc. indicate a relative order, position, direction, etc., and their technical meaning is not necessarily limited to the dictionary meaning.

3 is a cross-sectional view illustrating a backlight device according to the present embodiment.

Referring to FIG. 3 , the backlight device of this embodiment has a cover bottom 100 , a light source module 200 disposed inside the cover bottom 100 , a diffusion plate 300 disposed on the light source module, and stacked on the upper surface of the diffusion plate. and a guide panel 500 fastened along the edge of the optical sheet 400 and the cover bottom 100 . A liquid crystal panel (not shown) is seated on the panel seating surface 520 of the guide panel 500 to constitute a display device, and the liquid crystal panel uses a surface light source provided from the backlight device as a backlighting light source to realize high-quality images. .

Specifically, the cover bottom 100 is a back cover of the backlight device, and while accommodating an optical material for generating a backlighting surface light source therein, the cover bottom 100 stably fixes them. A back cover may be assembled on the rear surface of the cover bottom 100 or the cover bottom 100 may replace the back cover. In addition, the cover bottom 100 is composed of the press unit 110 and the molding unit 120 integrally coupled along the edge of the press unit 110 .

The press part 110 includes a bottom part 111 forming a rectangular plate shape and an insert part 112 bent upward along an edge of the bottom part 111 . The press unit 110 is preferably made of a material exhibiting excellent rigidity and heat dissipation properties, and may be made of, for example, aluminum or an aluminum alloy material.

The molding unit 120 is coupled while surrounding the insert unit 112 of the press unit 110 to guide the assembly of the light control member including the diffusion plate 300 and the optical sheet 400 . The molding part 120 includes a coupling part 121 coupled to the insert part 112 , a guide part 122 provided on the inner side of the top surface of the coupling part, and a shielding part 123 extending upward from the outside of the top surface of the coupling part. may include The coupling part 121 is integrally injected and molded into the insert part 112 , and the guide part 122 on the upper surface guides assembly by seating the edge of the diffuser plate 300 , and the shielding part 123 is the diffuser plate. The edges of the 300 and the optical sheet 400 are shielded and protected.

In addition, the molding part 120 may further include a fastening protrusion 124 formed to protrude from the outer surface of the coupling part 121 . The fastening protrusion 124 may form a hook shape. A fastening hole 511 having a shape corresponding to the fastening protrusion 124 is formed in the guide panel 500, and the cover bottom 100 and the guide panel 500 are formed by coupling the fastening protrusion 124 and the fastening hole 511. it is assembled The fastening protrusion 124 and the fastening hole 511 are used as auxiliary fastening means between the cover bottom 100 and the guide panel 500 to improve their coupling force.

The press unit 110 and the molding unit 120 may be formed by an insert molding process. That is, in the press unit 110 , the insert unit 112 may be used as insert water, and a resin such as PS or PE may be injection molded to form an integral body.

As such, the molding unit 120 is additionally coupled to the insert unit 112 constituting the vertical sidewall of the press unit 110 , thereby securing the guide unit 122 having a wider area than the insert unit 112 . In addition, the press unit 110 and the molding unit 120 constitute a single part, thereby simplifying the structure and improving assembling property.

The light source module 200 is disposed in the inner space of the cover bottom 100 to provide light from a plurality of point light sources upward. For this purpose, the light source module 200 may be configured as an LED array in which a plurality of LED light sources 220 are arranged horizontally, vertically, diagonally or in any direction on the substrate 210 . In addition, the diffusion lens 230 may be further disposed on the LED light source 220 , and the reflective sheet 240 may be coupled to the substrate 210 .

The diffusion plate 300 functions as an optical element for diffusing light from a plurality of point light sources incident from the light source module 200 . The diffusion plate 300 may be formed of a rectangular plate, and may be made of glass or a resin material having a light diffusion material added therein, and for example, PMMA (Polymethylmethacrylate), PS (Poly styrene), MS It may be composed of a plate such as Meta styrene) or PC (Polycarbonate).

The optical sheet 400 condenses and diffuses light emitted from the diffusion plate 300 to improve luminance and uniformity of the backlight device. The optical sheet 400 may be composed of a plurality of light control sheets including a prism sheet and a diffusion sheet.

The guide panel 500 is fastened to the cover bottom 100 while surrounding the edge of the cover bottom 100 to fix the diffuser plate 300 and the optical sheet 400 to the lower side, and to assemble the liquid crystal panel at the upper side. guide The guide panel 500 may be configured as a rectangular or 'C'-shaped frame with an open center, and includes a vertical fastening frame 510 for fastening to the cover bottom 100 , and a horizontal fastening frame on which the liquid crystal panel is seated. It includes a panel seating surface 520 in the direction and a protective frame 530 for protecting the side surface of the liquid crystal panel.

The guide panel 500 has a 'T' shape in cross section and a panel seating surface 520 extending to a predetermined width along the inner side of the fastening frame 510 is formed, and a liquid crystal panel is formed on the upper surface of the panel seating surface 520 . is settled In addition, the protection frame 530 is formed to protrude upward from the panel seating surface 520 while extending above the fastening frame 510 . The fastening frame 510 and the protection frame 530 may constitute the outer appearance of the edge of the display device. The guide panel 500 may be made of SUS or a resin material having sufficient rigidity while being thin.

4 is a cross-sectional view illustrating a cover bottom for a backlight device according to the present embodiment, and FIG. 5 is a process diagram illustrating a manufacturing process of the cover bottom for a backlight device according to the present embodiment.

Referring to FIG. 4 , the cover bottom 100 of this embodiment includes a press part 110 in which the bottom part 111 and the insert part 112 are connected in an 'L' shape, a coupling part 121, a guide part ( 122) and the molding part 120 having the shielding part 123, and the press part 110 and the molding part 120 form an integral body by an insert molding process.

Here, the coupling part 121 of the molding part 120 is molded to have a thickness w1 of about 0.3 mm to 0.6 mm along the surface of the insert part 112 . When the coupling part 121 has a thickness of less than 0.3 mm, the width of the guide part 122 becomes narrow, making it difficult to assemble the diffuser plate 300 , and when the thickness exceeds 0.6 mm, it is advantageous for assembling the diffuser plate. There is a disadvantage in that the bezel width of the backlight unit is relatively increased.

In addition, it is preferable that the shielding part 123 of the molding part 120 has a thickness w2 of 0.3 mm or less in consideration of the bezel width of the backlight unit, and the height h of the shielding part 123 is the assembled diffusion. It may be determined by the thickness of the plate 300 and the optical sheet 400 and is generally formed to a height h of 1.0 mm to 3.0 mm.

On the other hand, the cover bottom 100 may be manufactured by insert molding, and referring to FIG. 5 , after preparing the press unit 110 , it is mounted on the mold frame 600 . In this case, the press unit 110 press-forms a metal plate to form the bottom part 111 and the insert part 112 , and the insert part 112 forms a through hole 113 . The through hole 113 allows the resin to be smoothly injected during insert molding, and the connection part 125 filled in the through hole 113 connects the coupling part 121 on the inner and outer surfaces of the insert part 112, so it is combined after molding. It also provides an effect of preventing the part 121 from being separated from the insert part 112 .

A plurality of through holes 113 may be formed along the length direction of the insert part 112 , and it is preferable to be formed at intervals of at least 5 times or more based on the thickness of the insert part 112 . When the interval between the through holes 113 is narrower than this, resin filling can be easily performed, but the rigidity of the insert part 112 may be reduced. In addition, the diameter of the through hole 113 is formed to be less than twice the thickness of the insert portion 112 . Even when the diameter of the through hole 113 exceeds this, rigidity may be reduced.

After the press unit 110 is mounted on the mold frame 600 , the resin is injected and filled through the gate 610 , the filled resin is sufficiently cured, and the press unit 110 is separated from the mold frame 600 . ) and the molding unit 120 to manufacture a cover bottom 100 forming an integral body.

As described above, the cover bottom formed by integrally combining the press part made of a metal material and the molding part made of a resin material has an effect of being simple in structure and easy to manage and assemble as a single part. In addition, since the gap between the press part and the molding part is '0', the cover bottom has an advantageous effect in reducing the bezel width. On the other hand, when the diffuser plate support member is managed as a separate part, it is difficult to manage, and the wall thickness increases and the bezel width increases due to the tolerance occurring between the parts and the gap occurring during the fastening process.

In addition, since the molding part is formed in the insert part constituting the side wall of the press part in the cover bottom, the molding part reinforces the rigidity of the insert part, so that the thickness of the metal plate used as the material of the press part may be reduced.

In addition, since the vertical sidewall of the cover bottom is formed of a molding part, the degree of freedom in shape is improved.

In addition, the cover bottom has an effect that a through hole is formed in the insert part, thereby improving the bonding force between the press part and the molding part and allowing permanent coupling.

As described above, although exemplary embodiments of the present invention have been illustrated and described, various modifications and other embodiments may be made by those skilled in the art. All such modifications and other embodiments are intended to be contemplated and included in the appended claims without departing from the true spirit and scope of the present invention.

100: cover bottom
110: press part 111: bottom part
112: insert part 113: through hole
120: molding part 121: coupling part
122: guide part 123: shielding part
124: fastening protrusion 125: connection part
200: light source module
210: substrate 220: LED light source
230: diffusion lens 240: reflective sheet
300: diffuser plate
400: optical sheet
500: guide panel

Claims (8)

a press part comprising a bottom part and an insert part formed by bending an edge of the bottom part to one side; and
and a molding part coupled while surrounding the insert part;
The cover bottom for a backlight device, wherein the press part and the molding part are integrally formed by insert molding. According to claim 1, wherein the molding part,
A cover bottom for a backlight device, comprising: a coupling part surrounding the inside and outside of the insert part; a guide part providing a seating surface at an upper part of the coupling part; The method of claim 2, wherein the molding part,
The cover bottom for a backlight device further comprising a fastening protrusion formed to protrude from the outer surface of the coupling part. 3. The method of claim 2,
The insert part forms a through hole penetrating the inside and outside,
The molding part is filled in the through hole and further includes a connection part connecting the coupling part of the inner and outer surfaces of the insert part. (a) forming a press part having a bottom part and an insert part in which an edge of the bottom part is bent to one side in a pressing process for the plate; and
(b) an insert molding process using the insert part as insert water, and forming a molding part integrally formed with the press part; According to claim 5, wherein the step (b),
A method for manufacturing a cover bottom for a backlight device, wherein the molding part is formed to have a coupling part surrounding the inside and outside of the insert part, a guide part formed on an upper part of the coupling part, and a shielding part extending from an upper part of the coupling part to an upper side of the guide part. 7. The method of claim 6,
The step (a) forms a through hole penetrating the insert part inside and outside;
In the step (b), the molding part is formed so that the connection part connecting the coupling part of the inner and outer surfaces of the insert part is filled in the through hole. a cover bottom including a bottom portion, an insert portion formed by bending an edge of the bottom portion to one side, and a molding portion integrally formed with the insert portion by a molding process using the insert portion as insert water;
a light source module disposed in the receiving space inside the cover bottom;
a diffusion plate having an edge supported by the molding unit and disposed above the light source module;
an optical sheet laminated on the diffusion plate; and
A backlight device comprising a; guide panel fastened along an edge of the cover bottom.

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