KR20160056372A - Flat display device and method for manufacturing a bottom cover of the same - Google Patents

Abstract

A method for manufacturing a bottom cover for a flat display device according to an embodiment of the present invention, which can prevent the leakage of resin, comprises the steps of: forming a mold base, which covers the lower edge of a display panel, and at least one bottom coupling unit, which is disposed on each side surface of the mold base to open the mold base, by a press molding process; forming a guide unit, which is in contact with each inner corner of the mold base, by injecting resin into a receiving area between an upper mold and a lower mold, which are coupled to each other while receiving the mold base, and curing the resin in the receiving area; and forming a bottom cover including the mold base and the guide unit by removing the upper mold and the lower mold. In the step of forming the guide unit, the upper mold includes an avoidance pattern for separating the receiving area and each bottom coupling unit. Therefore, the guide unit is spaced apart from each bottom coupling unit by the avoidance pattern.

Description

TECHNICAL FIELD [0001] The present invention relates to a flat display device and a method of manufacturing a bottom cover for a flat panel display,

The present invention relates to a flat panel display device and a method of manufacturing the bottom cover thereof, in which the failure of fastening between the top cover and the bottom cover can be reduced.

As the era of informationization becomes full-scale, the display field for visually displaying electrical information signals is rapidly developing. Accordingly, studies have been continuing to develop performance such as thinning, lightening, and low power consumption for various flat display devices.

Typical examples of such flat panel display devices include a liquid crystal display device (LCD), a plasma display panel (PDP), a field emission display (FED) An electroluminescence display device (ELD), an electro-wetting display device (EWD), and an organic light emitting display device (OLED).

Such a flat panel display device generally includes a flat panel display panel for realizing an image, and a bottom cover and a top cover for supporting the flat panel display panel and protecting the panel from external physical impact.

A flat panel display panel has a structure in which a pair of substrates sandwiching an intrinsic light emitting material or a polarizing material are face-to-face bonded, and includes a display area on which a display area and a non-display area outside the display area are defined. The display region is defined as a plurality of pixel regions.

The bottom cover is disposed below the flat panel display panel to support the flat panel display panel and cover the lower edge and the side surface of the flat panel display panel.

The top cover is disposed on the top of the flat panel display panel, covers the top edge of the flat panel display panel, and is coupled to the bottom cover.

The bottom cover and the top cover are coupled to each other by fastening the fastening portions disposed on the sides of the bottom cover and the top cover.

In addition, the flat panel display device is disposed between the bottom cover and the top cover, and by supporting the flat panel display panel, the flat panel display panel disposed in the area between the bottom cover and the top cover is prevented from flowing, And a guide panel for preventing the cover from colliding with the cover.

In a conventional flat panel display device, the guide panel is provided through a separate injection molding process, and then is coupled to the bottom cover through a separate fastening member.

However, in recent years, as a method for minimizing the bezel of the flat panel display device, an injection molding process is performed in a state in which the bottom cover is inserted into the mold so as to remove the fastening member between the guide panel and the bottom cover, It is proposed to form a bottom cover with a built-in cover.

FIGS. 1A and 1B are process diagrams showing a process of forming a bottom cover having a guide panel in a general flat panel display, and FIG. 1C is a process diagram showing a connection failure between a bottom cover and a top cover.

1A, a mold base 11 of a bottom cover 10 is provided through a press molding process, and then a mold base 11 is provided between a lower mold 21 and an upper mold 22 for an injection molding process, And injects and hardens the resin into the receiving region defined by the lower mold 21 and the upper mold 22 and the mold base 11. [ Thereby, the mold base 11 and the bottom cover 10 including the guide panel 12 made of the hardened resin embedded in the mold base 11 are formed.

As shown in Fig. 1B, at least one fastening portion 13 is provided on each side surface of the mold base 11 of the bottom cover 10 for coupling with a top cover (not shown). The fastening portion 13 generally has a shape in which the mold base 11 is opened.

However, even when a resin having a volume corresponding to the volume of the receiving region is injected into the receiving region, the resin is exposed to a high-temperature and high-pressure atmosphere for reducing the time required for injection and curing to increase the density of the resin, have. As a result, there is a problem that the guide panel 12 can be formed defective.

1C, when the resin is cured in a state of being flowed out to the fastening portion, the fastening portion 13 of the bottom cover 10 is filled with the resin so that the fastening portion 33 of the top cover 30 There is a problem that it can not be firmly coupled.

In order to solve this problem, it is possible to add a step of removing the resin for forming the guide panel 12 filled in the fastening portion 13 of the bottom cover 10. However, in this case, There is a problem that the fastening portion 13 and the mold base 11 of the metal mold 11 may be damaged, causing another defect.

The present invention relates to a method of manufacturing a bottom cover which includes a mold base and a guide portion built in the mold base, and which can prevent resin, which forms the guide portion, from flowing out through a fastening portion disposed on a side surface of the mold base, And the reliability of the coupling between the top cover and the bottom cover can be improved and the yield can be improved by including the cover.

According to an aspect of the present invention, there is provided a display device including a mold base for covering a lower edge of a display panel using a press molding process, at least one bottom fastening member disposed on each side of the mold base, Forming a part; Injecting a resin into a receiving region between the upper mold and the lower mold coupled to each other with the mold base accommodated therein and curing the resin in the receiving region to form a guide portion in contact with each corner of the mold base; And forming the bottom cover including the mold base and the guide portion by removing the upper mold and the lower mold, wherein in the step of forming the guide portion, the upper mold includes the receiving region and each of the bottom fasteners The present invention also provides a manufacturing method of a bottom cover for a flat panel display, which includes a avoidance pattern for separating portions.

In the bottom cover manufactured by the method for manufacturing a bottom cover for a flat panel display, the guide portion is in contact with the respective side surfaces of the inside of the mold base, and is separated from the bottom fastening portions.

The flat panel display device according to the embodiment of the present invention includes the bottom cover having the guide panel built therein so that the fastening member for coupling the guide panel and the bottom cover can be removed.

The bottom cover for a flat panel display according to an embodiment of the present invention is provided with a mold base having at least one bottom fastening portion disposed on each side thereof and then a resin is injected between the lower mold and the upper mold, And cured to form a guide portion embedded in the mold base.

At this time, the receiving region defined by the lower mold, the upper mold, and the mold base is separated from the respective bottom fastening portions that open the mold base by the avoidance pattern of the upper mold. This can prevent the failure of the guide portion forming resin to flow out through the respective bottom fastening portions and the failure of the guide portion forming resin to fill the bottom fastening portion, so that the yield and reliability of the bottom cover can be improved.

In addition, since the step of removing the resin for forming the guide portion, which is filled with the bottom fastening portion, is not required, another defect that may be caused during resin removal can be prevented, which is advantageous in simplifying the process.

1A and 1B are process diagrams illustrating a process of forming a bottom cover having a guide panel in a general flat panel display device.
1C is a process chart showing the connection failure between the bottom cover and the top cover.
FIGS. 2A, 2B, and 2C are cross-sectional views illustrating a liquid crystal display device of a flat panel display device according to an exemplary embodiment of the present invention.
3 is a perspective view showing the bottom cover for the flat panel display of FIG. 2C.
4, 5A and 5B are cross-sectional views illustrating another example of a flat panel display device according to an embodiment of the present invention.
6 is a flowchart illustrating a method of manufacturing a bottom cover for a flat panel display according to an embodiment of the present invention.
Figs. 7A, 7B and 7C are process drawings showing respective steps of Fig.

Hereinafter, a flat panel display, a bottom cover, and a bottom cover for a flat panel display according to embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First, with reference to FIGS. 2A, 2B, 3, 4, 5A and 5B, a flat panel display according to one embodiment of the present invention and a bottom cover provided therein will be described.

2A, 2B, and 2C are cross-sectional views illustrating a flat panel display device according to an embodiment of the present invention. FIG. 3 is a perspective view illustrating the bottom cover for the flat panel display of FIG. 2c, and FIGS. 4, 5a, and 5b are cross-sectional views illustrating another example of the flat panel display device according to one embodiment of the present invention.

2A, the flat panel display 100 according to an exemplary embodiment of the present invention includes a display panel 110, a bottom cover 120 disposed below the display panel 110, And a top cover 130 disposed on the top.

2B, when the display panel 110 is a liquid crystal panel that selectively polarizes light, the flat panel display FD is disposed below the display panel 110, And a backlight unit 140 for irradiating the light toward the light source.

The display panel 110 includes a pair of mutually opposed substrates 111 and 112 and a light emitting material or a polarizing material (not shown) interposed therebetween.

Illustratively, when the display panel 110 is a liquid crystal panel, the display panel 110 includes a liquid crystal layer (not shown) made of liquid crystal between the pair of substrates 111 and 112.

Alternatively, when the display panel 110 is an organic light emitting display panel, the display panel 110 includes a plurality of organic light emitting elements disposed between the pair of substrates 111 and 112.

The bottom cover 120 includes a guide portion 121 for supporting the display panel 110 and a mold base 122 having the guide portion 121 therein.

The guide portion 121 is in contact with a side surface inside the mold base 122.

The mold base 122 covers the lower edge of the display panel 110.

The top cover 130 covers the upper edge of the display panel 110 and the side surface of the bottom cover 120.

The backlight unit 140 includes a light source 141 housed in at least one corner of the bottom cover 120, a light guide plate 142 that converts light emitted from the light source 141 into a surface light source, At least one optical film (143) scattering or diffusing light.

2C, the flat panel display FD includes at least one bottom fastening portion 123 disposed on each side of the mold base 122 of the bottom cover 120, And at least one tower fastening portion 133 disposed on the side surface.

Here, the bottom cover 120 and the top cover 130 are coupled to each other by coupling the respective bottom fastening portions 123 and the respective top fastening portions 133 to each other.

2C, each bottom fastening portion 123 of the bottom cover 120 opens a part of the side surface of the mold base 122 and protrudes toward the top cover 130 side.

3, each of the bottom fastening portions 123 may be in the form of a hook in which a metal piece, which is formed by cutting a part of the side surface of the mold base 122, is bent at least twice.

Here, the guide portions 121 of the bottom cover 120 are separated from the bottom fastening portions 123 by a predetermined distance SD.

As shown in FIG. 2C, the top fastening portions 133 of the top cover 130 are arranged to correspond to the respective bottom fastening portions 123.

For example, the top fastening portion 133 may have a shape in which a part of the side surface of the top cover 130 protrudes toward the bottom cover 120 so as to be inserted into the opening region by the bottom fastening portions 123. For example, the top fastening portion 133 may be in the shape of a hook point-symmetric with the bottom fastening portion 123.

Figures 2c and 3 show at least one bottom fastening part 123 formed on each side of the mold base 122 of the bottom cover 120 and at least one top fastening part 123 formed on each side of the top cover 130. [ Although the portion 133 is shown as a point-to-point symmetrical hook shape, one embodiment of the present application is not limited to the view of FIG. 2C and FIG.

That is, the shape of the bottom fastening part 123 can be applied not only to the hook shape shown in FIG. 2C and FIG. 3, but also to the shape that opens the mold base 122.

The shape of the top fastening part 133 can be applied not only to the hook shape shown in FIG. 2C and FIG. 3, but also to any shape that can be inserted into the opening area by the bottom fastening part 123.

4, each of the at least one bottom fastening portions 123 'formed on each side of the mold base 122 of the bottom cover 120 has a hole (not shown) passing through the mold base 122, Lt; / RTI >

At least one of the top fastening portions 133 'formed on each side surface of the top cover 130 may have a shape protruding toward the bottom cover 120 so as to be inserted into the bottom fastening portion 123' Can be applied.

Illustratively, the shape of each tower fastening portion 133 'may be in the form of a hook as shown in FIG. 2C, or in the form of a shank as shown in FIG.

Alternatively, as shown in Fig. 5A, each of the top fastening portions 133 "is not a protruded shape toward the bottom cover 120, but is formed so as to match the bottom fastening portions 123 ' 5B, the flat panel display 100 includes a coupling part 123 'for coupling the bottom coupling part 123' and the top coupling part 133 ', which are in the form of a hole, to each other. In this case, (150).

Next, a method of manufacturing the bottom cover for a flat panel display according to an embodiment of the present invention will be described with reference to Figs. 6 and 7A to 7C.

6, a method of manufacturing a bottom cover for a flat panel display according to an embodiment of the present invention includes a mold base 122 and at least one (S10) of forming a bottom fastening portion 123 of the mold base 122 and injecting and hardening the resin into a receiving region between the upper mold and the lower mold which are coupled to each other in a state of housing the mold base 122, (S20) of forming a guide part (121) to be embedded, and removing the upper mold and the lower mold (S30).

As shown in Fig. 7A, the press forming step is performed to form the mold base 122 and at least one bottom fastening portion 123, which opens part of its side face. (S10)

Next, step S20 of forming the guide part 121 is as follows.

The lower mold 210 and the upper mold 220 for the injection molding process are provided as shown in FIG. 7B.

The lower mold 210 and the upper mold 220 are coupled to each other in a state where the mold base 122 having at least one bottom fastening part 123 formed on each side is accommodated in the lower mold 210. As a result, the predetermined receiving area is defined by the lower mold 210, the upper mold 220, and the mold base 122.

At this time, the upper mold 220 includes a relief pattern 221 that separates each of the at least one bottom fastening portions 123 from the receiving region. When the lower mold 210 and the upper mold 220 are coupled to each other, the avoiding pattern 221 is formed around the bottom fastening portions 123 on the inner side surface of the mold base 122 so as to cover the bottom fastening portions 123 And at least a part thereof is contacted. Alternatively, the avoidance pattern 221 may extend toward the lower mold 210 and be in contact with the inner bottom surface of each bottom fastening portion 123.

Thereafter, the resin is injected into the receiving region between the lower mold 210, the upper mold 220 and the mold base 122, and the resin injected into the receiving region is cured, 121 are formed. (S20)

The guide portion 121 is separated from the at least one bottom fastening portion 123 by a predetermined distance SD by the avoiding pattern 221 of the upper mold 220. [ Here, the predetermined interval SD corresponds to the width of the avoidance pattern 221. [

7C, when the formation of the guide part 121 is completed, the lower mold 210 and the upper mold 220 are removed to form the guide part 121, The manufacture of the bottom cover 120 for a flat display device including the mold base 122 in which one bottom fastening portion 123 is disposed is completed. (S30)

As described above, the flat panel display 100 according to one embodiment of the present invention includes a guide panel (not shown) and a bottom cover 120 including a guide panel 121, 120 can be removed, which is advantageous for reducing the bezel.

The guide part 121 is formed by an injection molding process using a lower mold 210 and an upper mold 220 which are coupled to each other with the mold base 122 being interposed therebetween. The receiving area defined between the lower mold 210, the upper mold 220 and the mold base 122 is formed by the avoiding pattern 221 of the upper mold 220 so as to open the mold base 122 Is separated from at least one bottom fastening portion (123).

As a result, the defective pattern 221 of the upper mold 220 causes the resin for forming the guide portion 121 to flow out through the at least one bottom fastening portion 123 and the failure of the at least one bottom fastening portion 123, There is an advantage that defects that fill the opening can be prevented.

Accordingly, since it is unnecessary to remove the resin for forming the guide part 121 filled in at least one bottom fastening part 123, another defect that may be caused when removing the resin can be prevented, .

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Will be clear to those who have knowledge of.

100: Flat panel display device 110: Display panel
111, 112: upper substrate, lower substrate 120: bottom cover
121: guide portion 122: mold base
123, 123 ': Bottom fastening part 130: Top cover
133, 133 ', 133 ": top fastening part 140: backlight unit
150: engaging portion 210, 220: lower mold, upper mold
221: Avoid pattern

Claims (9)

A display panel including a pair of mutually opposed substrates, and a light emitting material or a polarizing material sandwiched therebetween;
A bottom cover including a guide part for supporting the display panel and a mold base for covering the lower edge of the display panel with the guide part embedded therein;
A top cover covering an upper edge of the display panel and a side surface of the bottom cover;
At least one bottom fastening portion disposed on each side of the mold base and opening the mold base;
And at least one top fastening portion disposed on each side of the top cover and coupled with the at least one bottom fastening portion,
Wherein the guide portion is in contact with the side surfaces of the inside of the mold base, and is spaced apart from the bottom fastening portions. The method according to claim 1,
Wherein each of the at least one bottom fastening portions has a hook shape in which a metal piece formed by cutting a part of a side surface of the mold base is bent at least twice. The method according to claim 1,
Wherein each of the at least one bottom fastening portions has a hole shape passing through the mold base. The method according to claim 2 or 3,
Wherein at least one of the at least one top fastening portions is inserted into the opening region by each of the at least one bottom fastening portions, wherein a part of the side surface of the top cover protrudes toward the bottom cover. The method of claim 3,
Each of the at least one top fastening portions being in the form of a hole through the top cover to match each of the at least one bottom fastening portions,
And at least one engaging portion connecting each of the top fastening portions and each of the bottom fastening portions. The method according to claim 1,
And a backlight unit disposed below the display panel and irradiating light toward the display panel side and being housed in the guide portion of the bottom cover. A method of manufacturing a bottom cover disposed at a lower portion of a display panel and supporting and covering the display panel,
Forming a mold base that covers the lower edge of the display panel using at least one press molding process and at least one bottom fastening portion disposed on each side of the mold base and opening the mold base;
Injecting a resin into a receiving region between the upper mold and the lower mold which are coupled to each other with the mold base accommodated therein and curing the resin in the receiving region to form a guide portion in contact with each corner of the inside of the mold base; And
Removing the upper mold and the lower mold to form a bottom cover including the mold base and the guide portion,
In the step of forming the guide portion,
Wherein the upper mold includes an avoidance pattern for separating the receiving region and each of the bottom fastening portions. 8. The method of claim 7,
In the step of forming the mold base and the at least one bottom fastening portion, each of the at least one bottom fastening portions is formed in a shape of a hook, in which a metal piece formed by cutting a part of a side surface of the mold base is bent at least twice, A method of manufacturing a bottom cover. 8. The method of claim 7,
Wherein the at least one bottom fastening portion of each of the at least one bottom fastening portions is in a hole shape passing through the mold base in the step of forming the mold base and the at least one bottom fastening portion.

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