KR100876236B1 - Liquid crystal display - Google Patents

Abstract

A liquid crystal display device is provided to improve the torsional strength by performing double drawing process along the circumference of the bezel. A liquid crystal display device comprises a backlight unit, a mold frame, a bezel(320), a flat plate(321), and a first and a second drawing part(322,323). The backlight unit placed on the rear surface of the liquid crystal display panel includes a light source, and a light guide plate. The bezel is inserted to the mold frame for supporting the mold frame. The bezel and the backlight unit of the liquid crystal display panel are installed on the flat plate. The first drawing part and the second drawing part are connected with the corner part(325) of circumference in a body.

Description

Liquid Crystal Display {Liquid Crystal Display}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device and a method for manufacturing the same, and more particularly, to a liquid crystal display device and a method for manufacturing the same, including a bezel processed by a double drawing process and improving bending strength.

Liquid Crystal Display (LCD) is a flat panel display (FPD) that displays an image using liquid crystal. There is an advantage in that it is widely used throughout the industry.

The liquid crystal display includes a thin film transistor (TFT) substrate, a color filter substrate facing the thin film transistor substrate, and an electrical signal interposed between the two substrates so that light transmittance is changed. It includes a liquid crystal display panel (Liquid Crystal Display Panel) consisting of a liquid crystal.

Since the liquid crystal display panel does not emit light by itself, the liquid crystal display panel requires a light source that provides light having a predetermined luminance or more to display the image. Currently, a backlight unit using a light emitting diode (LED) or the like as a light source of a liquid crystal display panel is used.

The backlight unit includes a light guide plate for condensing light generated from a light emitting diode, which is a light source, toward a liquid crystal display panel, and an optical sheet for downsizing the light exiting the light guide plate and switching a light propagation path to derive an appropriate luminance. (Top Down) is stacked. In this case, the liquid crystal display panel and the backlight unit are generally supported by a structure consisting of a mold frame and a bezel.

The liquid crystal display panel and the backlight unit are assembled to be fixed to a mold frame made of a resin material by a hook method, and the like, and a bezel made of a metal material is formed to surround the periphery of the mold frame to maintain the strength of the mold frame.

Recently, as the thickness of small and medium-sized display devices such as mobile phones, portable multimedia players (PMPs), and digital cameras become thinner and lighter, the structure consisting of a mold frame and a bezel is gradually becoming slimmer. .

However, there is a limit to the slimming of the assembly structure of the conventional mold frame and the bezel. For example, the thinner the bezel, the weaker the strength is, the easier it is to be deformed by torsional forces due to external shocks, etc. As a result, the mold frame holding the strength by the bezel can also be deformed. There is a problem that the liquid crystal display device is damaged.

SUMMARY OF THE INVENTION The present invention is to overcome the above-mentioned conventional problems, and an object of the present invention is to reinforce bending and torsional strength by using a double drawing along the circumference of the bezel, and to bend the mold frame and the liquid crystal display panel seated on the bezel. And a liquid crystal display device capable of reducing breakage due to torsion.

In order to achieve the above object, a liquid crystal display device according to the present invention includes a liquid crystal display panel, a backlight unit including a light source and a light guide plate positioned on a rear surface of the liquid crystal display panel, a mold frame in which the backlight unit is assembled, and the mold. And a bezel inserted into the mold frame to support the frame, wherein the bezel includes a first flat portion, in which a flat plate portion, the liquid crystal display panel, and a backlight unit are positioned, and bent upwards along a circumference of the flat portion; It may include a second drawing portion that is bent in the opposite direction from the first drawing portion.

The first drawing part may be formed in a rectangular frame shape on which the mold frame, the backlight unit, and the liquid crystal display panel are seated, and surround the side surfaces of the mold frame, the backlight unit, and the liquid crystal display panel.

The first drawing part may be formed to surround the remaining three sides except for one side on which the light source is assembled in the flat plate to which the light source is assembled.

The second drawing part may be formed to be spaced apart at the same height around the first drawing part.

The first drawing part and the second drawing part may be formed to be integrally connected to the round part.

The first drawing part and the second drawing part may be formed by integrally connecting a corner around the corner.

The first drawing part and the second drawing part may be formed in a rectangular ring shape.

The backlight unit and the liquid crystal display panel may be sequentially mounted on the mold frame.

The mold frame may be formed to surround the remaining three sides except for one side on which the light source of the flat plate is assembled.

The mold frame may be formed to a thickness of 0.3mm to 1.0mm.

The bezel may be formed to a thickness of 0.1mm to 0.3mm.

The bezel may be formed by a double drawing process.

The backlight unit may further include a reflective sheet disposed on a rear surface of the light guide plate and seated on the mold frame.

The backlight unit may further include a printed circuit board electrically connecting the light source and the liquid crystal display panel.

The backlight unit may further include an optical sheet disposed between the light guide plate and the liquid crystal display panel, and a light blocking tape disposed between the optical sheet and the liquid crystal display panel.

The light source may be a light emitting diode.

As described above, in the liquid crystal display device according to the present invention, the bezel included in the frame structure supporting the liquid crystal display panel and the backlight unit is formed by the double drawing processing method, whereby the strength is improved. In particular, since the flat plate portion, the first drawing portion and the second drawing portion of the bezel are formed to be integrally connected, there is an effect of not being easily deformed by external shock or vibration.

In addition, according to the present invention, the bezel has a structure in which the width of the bezel is doubled due to the formation of the first drawing portion and the second drawing portion, thereby improving the torsional strength.

In addition, according to the present invention, since the mold frame formed of the resin material is integrally formed with the bezel, there is an effect of protecting the liquid crystal display panel and the backlight unit from external shock or vibration.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings such that those skilled in the art may easily implement the present invention.

1 is a perspective view illustrating a liquid crystal display according to an exemplary embodiment of the present invention. 2 is an exploded perspective view of FIG. 1. 3 is a cross-sectional view taken along the line AA ′ of FIG. 1.

The liquid crystal display device 1 according to the exemplary embodiment of the present invention includes a liquid crystal display panel 100, a backlight unit 200, and a frame structure 300.

The liquid crystal display panel 100 forms a liquid crystal (not shown) and an electrode (not shown) necessary for driving the liquid crystal between two substrates 110 and 120 facing each other, and on at least one surface of the two substrates 110 and 120. It comprises a polarizing plate (not shown) disposed. In this case, a driving chip 130 for driving the liquid crystal display panel 100 is formed on one side of the lower substrate 120. In the liquid crystal display panel 100, corresponding information is displayed on the screen as the liquid crystal is driven. The liquid crystal display panel 100 may be mounted and fixed to the frame structure 300 to be described below. In the present invention, the structure of the liquid crystal display panel 100 is not limited, and a detailed structure thereof may be implemented by those skilled in the art and thus will be omitted.

The backlight unit 200 may be formed on the rear surface of the liquid crystal display panel 100. The backlight unit 200 may be formed in a structure for providing light necessary for displaying information on the liquid crystal display panel 100. In more detail, the backlight unit 200 may include a light source 210, a light guide plate 220, a reflective sheet 230, and an optical sheet 240.

The light source 210 may be disposed on a rear surface of the liquid crystal display panel 100 and may be mounted on a printed circuit board 211 and electrically connected to the liquid crystal display panel 100. As a light source 210 used in the present invention, a light emitting diode (LED) may be used. The light source 210 serves to provide the liquid crystal display panel 100 with light necessary for displaying image information of the liquid crystal display panel 100. Meanwhile, the printed circuit board 211 connected to the light source 210 may be formed of a flexible material so as to be easily assembled in the liquid crystal display device 1, and a plurality of driving chips necessary for driving the light source 210 ( Not shown) may be further formed.

The light guide plate 220 is disposed between the light source 210 and the liquid crystal display panel 100 to convert the point light source provided from the light source 210 into a surface light source. Light incident from the light source 210 is scattered by the pattern (not shown) formed on the rear surface of the light guide plate 220 to be directed toward the liquid crystal display panel 100. The light guide plate 220 may be formed of a material having a high strength and not easily deformed or broken, and having a good light transmittance. For example, the light guide plate 220 may be formed of polymethyl metaacrylate (PMMA). The light guide plate 220 is assembled and fixed to the frame structure 300 described below. The reflective sheet 230 may be disposed to prevent leakage to the rear surface of the light guide plate 220. In addition, various optical sheets 240 may be disposed on the front surface of the light guide plate 220 to improve light efficiency delivered to the liquid crystal display panel 100.

The reflective sheet 230 may be disposed on the rear surface of the light guide plate 220 to be seated on the mold frame 310 in more detail than the frame structure 300. As described above, the reflective sheet 230 serves to inject light, which may be emitted and lost in the opposite direction to the liquid crystal display panel 100, to the light guide plate 220 again. The material of the reflective sheet 230 may be polyethylene deterephthalate (PFT) or polycarbonate (PC), but the present invention is not limited thereto and may be replaced with another material having high reflectance.

The optical sheet 240 may include a diffusion sheet 241 and a prism sheet 242 on the light guide plate 220. The diffusion sheet 241 disperses the light emitted from the light guide plate 220 so that the light can be evenly transmitted to the liquid crystal display panel 100. The prism sheet 242 condenses the light dispersed by the light guide plate 220, the diffusion sheet 241, etc. to the liquid crystal display panel 100 to increase the light brightness.

In this case, the backlight unit 200 may also include a protective sheet 243 for protecting the optical sheet 240 from being damaged from an external impact or inflow of foreign matter. The backlight unit 200 may further include a light blocking tape 250 for preventing light from counting to a portion where image information is not displayed on the liquid crystal display panel 100. The light shielding tape 250 is disposed between the optical sheet 240 and the liquid crystal display panel 100, and is mainly attached to an edge portion where image information is not displayed on the liquid crystal display panel 100.

The frame structure 300 is formed of a mold frame 310 and a bezel 320. In this case, the bezel 320 is double-drawn to have a plurality of bent portions and inserted into the mold frame 310. In this case, the frame structure 300 may include a mold frame 310 into which the light source 210 and the light guide plate 220 are inserted and fixed, and a bezel 320 inserted to support the mold frame 310. The frame structure 300 provides a space for assembling the liquid crystal display panel 100 and the backlight unit 200. In addition, by supporting the liquid crystal display panel 100 and the backlight unit 200 serves to reinforce the strength so that the liquid crystal display device 1 is not damaged by the impact or vibration from the outside.

Hereinafter, the frame structure 300 according to an embodiment of the present invention will be described in more detail with reference to other drawings.

Figure 4 is a perspective view of the combination of the mold frame and the bezel according to an embodiment of the present invention. 5 is a perspective view showing a mold frame according to an embodiment of the present invention. 6 is a perspective view showing a bezel according to an embodiment of the present invention.

 Referring to FIG. 4, the frame structure 300 includes a mold frame 310 and a bezel 320. In this case, the bezel 320 is formed by a double drawing process to have a plurality of bent portions. ) May be inserted into the mold frame 310 and injection molded to integrate the bezel 320 and the mold frame 310.

Here, the dual drawing processing method means drawing sequentially using two dies of different sizes. The bezel 320 may be formed by first drawing a metal sheet with a large die, and then secondly drawing a relatively small die.

Referring to FIG. 5, the mold frame 310 may include a light source fixing part 311 to which the light source 210 is fixed, and a light guide plate fixing part 312 to which the light guide plate 220 is fixed. Can be.

In this case, the mold frame 310 further includes driving chip fixing parts 313 and 314 to which a plurality of driving chips (not shown) mounted on the printed circuit board (211 of FIG. 2) are fixed to drive the light source 210. It can be made, including. The light source fixing part 311, the light guide plate fixing part 312, and the driving chip fixing parts 313 and 314 are formed of the light source (210 of FIG. 2) and the light guide plate (220 of FIG. 2) seated on the mold frame 310. It may vary depending on the form, it is not limited in the present invention. The mold frame 310 is formed of a synthetic resin material, made of a substantially rectangular frame shape.

As such, the mold frame 310 may be integrally formed with the bezel 320 by inserting and injection molding the bezel 320 to be described below. In this case, the mold frame 310 may be formed to a thickness t1 of about 0.3 mm to 1.0 mm. When the thickness t1 of the mold frame 310 is thinner than 0.3 mm, molding of the mold frame 310 may be difficult, and it is difficult to play a role of inserting and supporting the light source 210 and the light guide plate 220. On the other hand, when the thickness t1 of the mold frame 310 becomes thicker than 1.0 mm, it may be difficult to follow the trend of the recently slimming liquid crystal display device.

Referring to FIG. 6, the bezel 320 includes a flat plate portion 321, a first drawing portion 322 and a first drawing portion 322 formed by bending upwardly along a circumference of the flat plate portion 321. The second drawing portion 323 is bent and formed in the opposite direction. In this case, the first drawing part 322 and the second drawing part 322 may be formed by double drawing.

The flat plate portion 321 has a shape of a substantially flat rectangular frame, and is formed to support the mold frame 310. The flat plate part 321 is integrally connected with the first drawing part 322.

In addition, each corner portion of each of the round part 324 and the first drawing part 322 and the second drawing part 323 are formed so that the first drawing part 322 and the second drawing part 323 are integrally connected. It may further include a corner portion 325 formed to be integrally connected.

The first drawing portion 322 is bent in a vertical direction along the circumference of the flat plate portion 321, is formed to surround the side of the mold frame 310. In this case, the first drawing part 322 may be formed on the circumference (three sides of the flat plate 321) except at least one side 320a. Accordingly, the case where the assembly space with the backlight unit 200 including the light source 210 of FIG. 2 is reduced by the first drawing unit 322 may be prevented. However, the first drawing part 322 may be integrally formed on all the circumferences (four sides) of the flat plate part 321 according to the structure of the backlight unit 200 of FIG. 2, but the present invention is not limited thereto.

The second drawing portion 323 is bent in the opposite direction of the first drawing portion 322 is formed spaced apart at the same height around the first drawing portion 322. In this case, the second drawing unit 323 may be spaced apart from the first drawing unit 322, or may be in close contact. In addition, the second drawing portion may be formed around the circumference (three sides of the flat plate portion 321) except at least one side 320a of the second drawing portion.

The round part 324 and the corner part 325 may include a first drawing part 322 bent in a vertical direction of the flat plate part 321 and a second drawing bent in an opposite direction from the first drawing part 322. The unit 323 may be connected integrally without opening sequentially. Therefore, the bezel 320 can improve bending and torsional strength.

In addition, the thickness t2 of the bezel 320 including the first drawing part 322 and the second drawing part 323 may be formed within 0.1 mm to 0.3 mm. When the thickness t2 of the bezel 320 becomes thinner than 0.1 mm, the strength of the bezel 320 becomes weak to support the mold frame 310, and it is difficult to reinforce the strength of the liquid crystal display device 1. On the other hand, when the thickness t2 of the bezel 320 becomes thicker than 0.3 mm, the liquid crystal display device may be in a slimmer (or lighter weight) manner.

The bezel 320 may be formed of a metal material having rigidity. The bezel 320 may support not only the mold frame 310 but also the light guide plate 220 and the liquid crystal display panel 100. Therefore, when an external shock or vibration is applied to the liquid crystal display device 1, it can be protected.

Therefore, the bezel 320 according to the embodiment of the present invention is formed by the double drawing processing method, and thus the strength of the frame structure 300 and the liquid crystal display device 1 including the same is improved, and thus the bending and torsional external forces are more improved. You can achieve a stronger structure.

Next, a manufacturing method of the bezel 320 included in the above-described liquid crystal display device 1 will be described. The method of manufacturing the bezel 320 for a liquid crystal display device described below corresponds to an example for clarity of understanding the present invention, and the method of manufacturing the bezel for a liquid crystal display device of the present invention is not limited thereto.

7 is a block diagram illustrating a method of manufacturing a bezel for a liquid crystal display according to an exemplary embodiment of the present invention. 8A to 8F are cross-sectional views illustrating a method of manufacturing a bezel for a liquid crystal display according to an exemplary embodiment of the present invention.

The bezel 320 for the liquid crystal display according to the exemplary embodiment of the present invention, referring to FIG. 7, includes a first drawing step S100 and a second drawing step S200.

The metal plate preparation step (S110), the first pressing step (S120) and the first molding knockout step (S130), the second drawing step (S200) is the primary molding preparation step (S210), the second pressurization It may comprise a step (S220) and the second molding knockout step (S230).

First, as shown in FIG. 8A, the primary drawing step S100 is performed when the metal plate preparation step S110 is performed by hollowing the metal plate 32, which is a raw material of the bezel 320, with an empty first die 33. It is a step to put on. In this case, a first punch 34 for drawing the metal sheet 32 with the first die 33 may be set on the lower surface of the metal sheet 32. A knockout device 35 may be formed in the first die 33 to take the metal plate 32 back to the outside after molding the metal plate 32.

The first pressing step (S120) is a step of forming a shape by pressing the metal plate 32 into the first die 33 using the first punch 34 as shown in FIG. 8B. Accordingly, the metal plate 32 may be formed in the shape of a rectangular frame corresponding to the first punch 34, but is not limited thereto.

As shown in FIG. 8C, the primary molded product knockout step S130 is a step of taking out the primary molded product 32 ′ formed by the primary pressurization step S120 to the outside using the knockout device 35. Therefore, the primary molding for the bezel 320 may be completed through the primary drawing step S100.

As shown in FIG. 8D, the primary molding preparation step S210 may include a second die having a relatively smaller size than the first die 33 by forming the primary molding 32 ′ formed by the primary drawing step S100. It is a step on the top surface of (33 '). A second punch 34 'may be set on the upper surface of the primary molding 32' for drawing the primary molding 32 'with the second die 33'. A knockout device 35 ′ may be formed inside the second die 33 ′ for molding the primary molding 32 ′ back out after forming the primary molding 32 ′.

The secondary pressing step (S220) is a step of forming a shape by pressing the metal plate 32 'into the second die 33' by using the second punch 34 'as shown in FIG. . Accordingly, the metal plate 32 ′ may be formed in a rectangular frame shape corresponding to the second punch 34 ′. In this case, in order to prevent the metal plate 32 'from being deformed, the metal plate 32' may be formed by reducing the strength corresponding to the second punch 34 '. Accordingly, the metal plate 32 ′ may be formed in a rectangular frame shape corresponding to the second punch 34 ′, but is not limited thereto.

Finally, as shown in FIG. 8F, the secondary molding knockout step S230 is performed by removing the bezel 320 to the outside of the second die 33 ′ using the same method as the primary molding knockout step S230. Step. Therefore, the secondary molding for the bezel 320 may be completed through the secondary drawing step S200.

As such, the bezel 320 having a structure that is stronger in strength and resistant to torsional external force is formed through the first drawing step S100 and the second drawing step S200.

What has been described above is only one embodiment for implementing the liquid crystal display device according to the present invention, and the present invention is not limited to the above-described embodiment, and as claimed in the following claims, the gist of the present invention Without departing from the scope of the present invention, any person having ordinary skill in the art will have the technical spirit of the present invention to the extent that various modifications can be made.

1 is a perspective view illustrating a liquid crystal display according to an exemplary embodiment of the present invention.

2 is an exploded perspective view of FIG. 1.

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

Figure 4 is a perspective view of the combination of the mold frame and the bezel according to an embodiment of the present invention.

5 is a perspective view showing a mold frame according to an embodiment of the present invention.

6 is a perspective view showing a bezel according to an embodiment of the present invention.

7A to 7G are cross-sectional views illustrating a method of manufacturing a bezel for a liquid crystal display according to an exemplary embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

1: Liquid Crystal Display 32, 32 ', 32 ": Metal Plate

33, 33 ': Die 34, 34': Punch

100: liquid crystal display panel 110, 120: substrate

130: driving chip 200: backlight unit

210: light source 211: printed circuit board

220: Light guide plate 230: Reflective sheet

240: optical sheet 241: diffusion sheet

242: prism sheet 243: protective sheet

250: shading tape 300: frame structure

310: mold frame 311: light source fixing part

312: light guide plate fixing part 313, 314: driving chip fixing part

320: bezel 321: flat plate

322: first drawing unit 323: second drawing unit

324: round part 325: corner part

Claims (16)

A liquid crystal display panel; A backlight unit including a light source and a light guide plate disposed on a rear surface of the liquid crystal display panel; A mold frame in which the backlight unit is assembled; and A bezel inserted into the mold frame to support the mold frame; The bezel may include a flat platen portion in which the liquid crystal display panel and the backlight unit are located, a first drawing portion bent upward along a circumference of the plate portion, and a second drawing portion bent in an opposite direction from the first drawing portion. Include, The first drawing portion and the second drawing portion is a liquid crystal display, characterized in that the peripheral corner portion is made to be integrally connected. The method of claim 1, And the first drawing part is formed to surround three sides except for one side of the flat plate around which the light source is assembled. The method of claim 1, And the first drawing part is formed in a rectangular frame shape on which the mold frame, the backlight unit, and the liquid crystal display panel are seated, and surrounds side surfaces of the mold frame, the backlight unit, and the liquid crystal display panel. . The method according to claim 2 or 3, And the second drawing part is formed to be spaced apart at the same height around the first drawing part. The method according to claim 2 or 3, And a round part integrally connected between the first drawing part and the second drawing part. delete The method according to claim 2 or 3, And the first drawing part and the second drawing part have a rectangular ring shape. The method according to claim 2 or 3, And the backlight unit and the liquid crystal display panel are sequentially mounted on the mold frame. The method according to claim 2 or 3, And the mold frame is formed so as to surround three remaining sides except for one side on which the light source of the flat panel is assembled. The method according to claim 2 or 3, And the mold frame has a thickness of 0.3 mm to 1.0 mm. The method according to claim 2 or 3, The bezel may be formed to a thickness of 0.1mm to 0.3mm. The method according to claim 2 or 3, And the bezel is formed by a double drawing process. The method according to claim 2 or 3, The backlight unit may further include a reflective sheet disposed on a rear surface of the light guide plate and seated on the mold frame. The method according to claim 2 or 3, And the backlight unit further comprises a printed circuit board electrically connecting the light source and the liquid crystal display panel. The method according to claim 2 or 3, And the backlight unit further comprises an optical sheet disposed between the light guide plate and the liquid crystal display panel, and a light shielding tape disposed between the optical sheet and the liquid crystal display panel. The method according to claim 2 or 3, And the light source is a light emitting diode.

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