KR20070056181A - Backlight assembly and liquid crystal display device having the same - Google Patents

Abstract

A backlight assembly and an LCD(Liquid Crystal Display) having the same are provided to prevent the leakage of light and improve the reliability of product, by forming a support member on a support main to strongly hold a reflecting plate, a light guiding plate, and optical sheets. A reflecting plate(150), a light guiding plate(140), and optical sheets(130) are sequentially disposed. A support main(170) has at least one support member(200) for supporting a rear surface of the reflecting plate. A bottom case(180) holds the support main. The support member is integrated into the support main. The support member is formed at the edge of the support main. The support member is extended from the rear surface of the support main at a predetermined distance.

Description

BACKLIGHT ASSEMBLY AND LIQUID CRYSTAL DISPLAY DEVICE HAVING THE SAME}

Figure 1a is a perspective view showing a conventional liquid crystal display device.

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

FIG. 1C is a cross-sectional view taken along the line II ′ of FIG. 1A illustrating a failure of a liquid crystal display according to the exemplary embodiment of FIG. 1A.

FIG. 1D is a cross-sectional view taken along the line II ′ of FIG. 1A illustrating a failure of a liquid crystal display according to another exemplary embodiment of FIG. 1A.

2A is an exploded perspective view illustrating a liquid crystal display device according to a first embodiment of the present invention.

FIG. 2B is a cross-sectional view taken along the line II-II 'of FIG. 2A;

3A is an exploded perspective view showing a liquid crystal display device according to a second embodiment of the present invention.

3B is a cross-sectional view taken along the line III-III 'of FIG. 3A;

4A is a perspective view showing a support main according to a third embodiment of the present invention;

Figure 4b is a perspective view showing a support main according to a fourth embodiment of the present invention.

Figure 4c is a perspective view showing a support main according to a fifth embodiment of the present invention.

5A is a perspective view illustrating a liquid crystal display according to a sixth embodiment of the present invention.

FIG. 5B is a cross-sectional view taken along the line IV-IV 'of FIG. 5A;

* Description of the symbols for the main parts of the drawings *

110, 610: liquid crystal panel 120: backlight assembly

130, 630: Optical sheet 140, 640: Light guide plate

150, 670: Reflector 170, 270, 370, 470, 570, 670: Support main

180, 280, 680: bottom case 200, 300, 400, 700: support

310: hole 500, 600: support surface

The present invention relates to a liquid crystal display device, and more particularly, to a backlight assembly capable of fixing a light guide plate and a liquid crystal display device having the same.

CRT (Cathode Ray Tube), one of the widely used display devices, is mainly used for monitors such as TVs, measuring devices, information terminal devices, etc., but due to the weight and size of the CRT itself, the miniaturization and weight reduction of electronic products Could not actively respond to the response.

As a solution to this problem, the liquid crystal display device has an advantage that it is possible to realize a light and short and small power consumption compared to the CRT. In particular, liquid crystal displays using thin film transistors have been used in various fields in the notebook PC and monitor market as well as in recent years since they have achieved high quality, large size, and color display screen comparable to CRTs.

Such a liquid crystal display includes a liquid crystal panel for displaying an image, a driving circuit for driving the liquid crystal panel, and a backlight assembly for providing light, and these components are stacked in a support main. Assembled and completed in a finished state. Here, the driving circuit is usually attached to the rear surface of the backlight assembly, and is electrically connected to the liquid crystal panel and the flexible printed circuit board (FPC).

FIG. 1A is a perspective view illustrating a conventional liquid crystal display, and FIG. 1B is a cross-sectional view taken along the line II ′ of the liquid crystal display of FIG. 1A.

As shown in FIGS. 1A and 1B, a conventional liquid crystal display device includes a liquid crystal panel 10 and a backlight assembly 20 for supplying light to the liquid crystal panel 10. The backlight assembly 20 is attached to a bottom case 80, a light guide plate 40 disposed on the bottom case 80 to guide light forward, and a bottom surface of the light guide plate 40 to forward the light forward. A support main 70 fixed to the bottom case 80 by holding a reflecting plate 50 for reflecting, an optical sheet 30 disposed on the light guide plate 40, and the liquid crystal panel 10. It is configured to include. A light source (not shown) is disposed on the side surface of the light guide plate 40 to generate light and incident light onto the side surface of the light guide plate 40.

The light guide plate 40 and the optical sheets 30 are provided on the reflective plate 50.

On one side of the back surface of the support main 70 adjacent to the light guide plate 40, a light shielding tape 60 is attached to the reflective plate 50 to block light projected to the outside.

An edge on the reflective plate 50 is attached to the rear surface of the support main 70 by the light blocking tape 60.

The light guide plate 40 and the optical sheets 30 provided on the reflective plate 50 are supported by a light shielding tape 60 for attaching the reflective plate 50 and the support main 70 to each other.

The bottom case 80 is fixed to the side of the support main 70 and a screw or a protrusion and a hole.

The light blocking tape 60 is attached to the reflective plate 50 to prevent the light guide plate 40 and the optical sheets 30 from being separated downward.

FIG. 1C is a cross-sectional view taken along a line II ′ of a liquid crystal display according to the exemplary embodiment of FIG. 1A, and FIG. 1D is a liquid crystal display according to another exemplary embodiment of FIG. 1A. A cross-sectional view taken along the line II ′ of FIG.

As shown in FIG. 1C, the components of the liquid crystal display according to the exemplary embodiment are the same as those of the conventional LCD shown in FIG. 1B, and thus descriptions of the components will be omitted.

The liquid crystal display device supports the reflective plate 50, the light guide plate 40, and the optical sheets 30 by only the light blocking tape 60, so that the adhesive force of the light blocking tape 60 is impacted, vibrated, or transported. 50, the light guide plate 40, and the optical sheets 30 may not be supported, and defects that frequently fall downward from the support main 70 by a predetermined interval existing on the bottom case 80 may occur.

As described above, when the reflective plate 50, the light guide plate 40, and the optical sheets 30 are separated downward, part of the light generated from the side surface is not incident to the light guide plate 40, but is incident on the liquid crystal panel 10. There is a problem of causing unevenness in luminance and poor image quality due to light leakage.

As shown in FIG. 1D, the bottom case 80 may have a structure in which the bottom case 80 is deleted according to the type of product. In this case, the adhesive force of the light shielding tape 60 does not support the reflecting plate 50, the light guide plate 40, and the optical sheets 30 during shock, vibration, or transportation, and thus is separated from the lower part, resulting in a separated product defect. There was a problem.

An object of the present invention is to provide a backlight assembly and a liquid crystal display device having the same, in which a support part is formed on the support main to fix the reflecting plate, the light guide plate, and the optical sheets more firmly, thereby preventing light leakage and improving the reliability of the product. There is this.

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

Reflecting plates, light guide plates, and optical sheets arranged sequentially; A support main having at least one support for supporting a rear surface of the reflector; And a bottom case for fixing the support main.

In the backlight assembly according to the second embodiment of the present invention,

Reflecting plates, light guide plates, and optical sheets arranged sequentially; And a support main having at least one support for supporting a rear surface of the reflecting plate.

In the backlight assembly according to the third embodiment of the present invention,

Light guide plates and optical sheets arranged sequentially; And a support main having at least one support for supporting a rear surface of the light guide plate.

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

Reflecting plates, light guide plates, and optical sheets arranged sequentially; A support main having at least one support for supporting a rear surface of the reflector; A liquid crystal panel mounted on the support main to display a predetermined image; And a bottom case for fixing the support main.

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

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

2A and 2B, the liquid crystal display according to the first embodiment includes a liquid crystal panel 110 for displaying an image and a backlight assembly 120 for providing light to the liquid crystal panel 110. It is configured by.

The backlight assembly 120 is attached to a bottom case 180, a light guide plate 140 disposed on the bottom case 180 to guide light forward, and a bottom surface of the light guide plate 140 to move light forward. A reflective plate 150 for reflecting, an optical sheet 130 disposed on the light guide plate 140 for diffusing and condensing light, and fixed to the bottom case 180 while supporting the liquid crystal panel 110. It is configured to include a support main 170.

Although not shown, a light source (not shown) for generating light is disposed on the side of the light guide plate 140. The light source may include a fluorescent lamp, a light emitting diode (LED), an organic light emitting diode (OLED), and the like.

The support main 170 is formed with a plurality of support parts 200 to prevent the reflection of the reflective plate 150, the light guide plate 140 and the optical sheet 130 in the corner region of the rear surface. The plurality of support parts 200 may be formed of the same material as the support main 170 during the manufacturing process of the support main 170.

The support part 200 extends inwardly from the rear surface of the support main 170 and is in surface contact with the rear surface of the reflective plate 150 corresponding to the support part 200. Therefore, the support part 200 is in surface contact with the rear edge of the reflector plate 150.

The support part 200 is formed in a straight shape, but is not limited thereto, and may be formed in a round shape, each shape, or the like.

In the liquid crystal display according to the first exemplary embodiment of the present invention, the reflective plate 150 corresponding to the support part 200 is fixed to the support part 200 formed in the inner edge area of the back surface of the support main 170 by surface contact. In addition, the reflective plate 150, the light guide plate 140, and the optical sheets 130 may be prevented from being separated from the support main 170 during shock, vibration, or transportation. Accordingly, it is possible to prevent light loss such as light leakage and to improve product reliability.

3A is an exploded perspective view illustrating a liquid crystal display according to a second exemplary embodiment of the present invention, and FIG. 3B is a cross-sectional view taken along the line II-II ′ of FIG. 3A.

As shown in FIGS. 3A and 3B, the liquid crystal display according to the second embodiment of the present invention supports each component of the liquid crystal display according to the first embodiment of the present invention shown in FIGS. 2A and 2B. Since it is the same as other components except the main 270 and the bottom case 280, the description of the same components will be omitted below.

In the liquid crystal display according to the second exemplary embodiment of the present invention, a plurality of support parts 300 having a protruding shape are formed in the support main 270, and a plurality of support parts 300 are formed in the bottom case 280 in a region corresponding to the support part 300. Holes 310 are formed.

The support part 300 has a predetermined thickness to support the reflector plate 150, the light guide plate 140, and the optical sheets 130 in each corner region of the back surface of the support main 270, and the support main 270. It extends inward in the corner region of the formed.

The hole 310 is formed in the same shape as the support 300 so that the support 300 can be inserted.

The support part 300 may be formed in a straight shape, a round shape and each shape.

The support part 300 is in surface contact with the reflector plate 150 corresponding to the support part 300 to support the reflector plate 150, the light guide plate 140, and the optical sheets 130.

The liquid crystal display according to the second exemplary embodiment has a bottom case to improve the difficulty of slimming caused by the thickness of the support part 300 formed to support the reflector plate 150, the light guide plate 140, and the optical sheets 130. The hole 310 may be formed in an area corresponding to the support part 300 of 280 to prevent the reflection plate 150, the light guide plate 140, and the optical sheets 130 from being separated, thereby improving the difficulty of slimming. have.

The support parts 200 and 300 described above are relatively small compared to the overall size of the reflector plate 150, the light guide plate 140, and the optical sheets 130. Therefore, when a strong impact is applied, the support parts 200 and 300 of small size may be broken by the reflective plate 150, the light guide plate 140, and the optical sheets 130. The support parts 200 and 300 may be formed of the same plastic material as the support mains 170 and 270 and may be damaged by a strong impact. To solve this problem, a liquid crystal display device having a structure as shown in FIGS. 4A to 4C is derived.

Figure 4a is a perspective view showing a support main according to a third embodiment of the present invention, Figure 4b is a perspective view showing a support main according to a fourth embodiment of the present invention, Figure 4c is a fifth embodiment of the present invention Is a perspective view of a support main according to the present invention.

As shown in FIGS. 3B and 4A, the support main 370 according to the third exemplary embodiment of the present invention has a plurality of support parts 400 formed on the back thereof, and the support part 400 is formed of the support main 370. It is formed extending inward.

The shape of the support part 400 may be formed in a straight line, a round and an angle.

The third embodiment of the present invention is similar to the first embodiment of the present invention. However, the plurality of support parts 400 of the third embodiment disperses or buffers the strong force that may occur during shock, vibration, or transportation, so that the reflector plate 150, the light guide plate 140, and the optical sheets 130 and the support part are provided. It is possible to prevent the 400 from hitting and breaking.

The number of the support units 400 is not limited to FIG. 4A, and a larger number of support units 400 may be formed in the large LCD according to the size of the LCD.

As shown in FIGS. 4B and 4C, the support mains 470 and 570 according to the fourth and fifth embodiments have support surfaces 500 and 600 formed on their rear surfaces, and the support surfaces 500 and 600. ) Is formed on a part of the rear edge of the support mains 470 and 570 or the entire rear surface.

The support surfaces 500 and 600 may have a predetermined thickness and may be formed during the manufacturing process of the support mains 470 and 570, and may be formed of the same material as the support mains 470 and 570.

According to the fourth embodiment, the support surface 500 may be formed to extend a predetermined distance inward of the rear surface of the support main 470, and according to the fifth embodiment, the support surface 600 may be the support main 570. It may extend to the inner side of the rear surface may be formed on the front surface of the lower portion of the reflecting plate 150.

The support surfaces 500 and 600 of the fourth and fifth embodiments disperse or buffer strong forces that may occur during shock, vibration, or transportation, thereby reflecting the reflector plate 150, the light guide plate 140, and the optical sheet 130. ) To prevent the departure.

In the first to fifth embodiments of the present invention, the bottom cases 180 and 280 are provided to surround the support mains 170, 270, 370, 470, and 570, but the bottom case ( Some products 180, 280 have been deleted. As such, the models in which the bottom cases 180 and 280 are removed are the reflecting plate 150, the light guide plate 140, and the support part 200, 300, 400 or the support surfaces 500, 600 of the first to fifth embodiments. Separation of the optical sheet 130 can be prevented.

5A is a perspective view illustrating a liquid crystal display according to a sixth embodiment of the present invention, and FIG. 5B is a cross-sectional view taken along the line IV-IV ′ of FIG. 5A.

5A and 5B, in the liquid crystal display according to the sixth exemplary embodiment of the present invention, a reflecting plate 650 is coated or attached on the bottom case 680, and a support part is formed on the rear surface of the support main 670. 700 is formed and includes a light guide plate 640 and optical sheets 630 sequentially stacked in the support main 670. In addition, the liquid crystal panel 610 supported by the support main 670 is further included.

The support parts 200, 300 and 400 or the support surfaces 500 and 600 according to the first to fifth embodiments may include reflecting plates corresponding to the support parts 200, 300 and 400 or the support surfaces 500 and 600 (FIG. 1). Although the surface of the bottom case 680 is coated or attached to the bottom case 680 according to the type of the liquid crystal display device as in the sixth embodiment, the support part of the sixth embodiment The back surface of the light guide plate 640 corresponding to 700 may be in surface contact to prevent separation of the light guide plate 640 and the optical sheets 630.

Although six embodiments have been described in the above description, the support parts 200 and 300 of the support mains 170, 270, 370, 470, 570, and 670 which prevent the detachment of the backlight assembly, which is a technical spirit of the present invention, are described. More embodiments may exist for the structure in which the support surfaces 500 and 600 are formed. Therefore, although not described above, any technology falling within the scope of the technical idea of the present invention may be regarded as the technical idea of the present invention.

As described above, according to the present invention, by forming a support part or a support surface in the support main to prevent the backlight assembly from being separated, thereby preventing light loss due to light leakage and improving image quality to improve product reliability. There is.

According to the present invention, by forming a support on the support main, and forming a hole on the bottom case corresponding to the support to prevent separation of the backlight assembly, to prevent light loss due to light leakage, to improve the image quality to improve product reliability While improving the, there is an effect to improve the slimming of the product.

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

Claims (14)

Reflecting plates, light guide plates, and optical sheets arranged sequentially; A support main having at least one support for supporting a rear surface of the reflector; And And a bottom case fixing the support main. The method of claim 1, And the support part is integrally formed with the support main. The method of claim 1, And the support part is formed at an edge of the support main part. The method of claim 3, wherein And the support portion extends a predetermined distance inward from the rear surface of the support main. The method of claim 1, And a reflector plate corresponding to the support part is mounted on the support part. The method of claim 1, The support part extends a predetermined distance inwardly from the rear surface of the support main, protrudes downwardly, and the bottom case is formed with at least one hole corresponding to the support part. The method according to claim 1 and 6, And a reflector plate corresponding to the support part is seated on the support part, and the support part is inserted into and fixed to the hole. The method of claim 1, The support assembly is at least one backlight assembly, characterized in that formed on each of the corners and sides of the support main. The method of claim 1, The support unit is a backlight assembly, characterized in that the predetermined extension extending inward from the side of the support main. The method of claim 1, And the support portion is formed on the entire rear surface of the support main. The method of claim 1, The support assembly has a straight line, round shape or each shape, characterized in that the backlight assembly. Reflecting plates, light guide plates, and optical sheets arranged sequentially; And And a support main having at least one support for supporting a rear surface of the reflector. Light guide plates and optical sheets arranged sequentially; And And a support main having at least one support for supporting a rear surface of the light guide plate. Reflecting plates, light guide plates, and optical sheets arranged sequentially; A support main having at least one support for supporting a rear surface of the reflector; A liquid crystal panel mounted on the support main to display a predetermined image; And And a bottom case fixing the support main.

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