KR20070071708A - 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 improve the brightness at edge portions of the backlight assembly, by moving power terminals in which light sources are fixed, through terminal guides formed at corner portions of a bottom case so that the light sources are disposed adjacently with the corner portions of the bottom case. Light sources(150) are disposed at a predetermined interval. The light sources are fixed by a first power terminal and a second power terminal(160'). Terminal guides(200) are formed at corner portions of a bottom case(170) in a right-angle type. Both ends of the first power terminal and both ends of the second power terminal are respectively placed in the terminal guides. The terminal guides are integrally formed with the bottom case.

Description

BACKLIGHT ASSEMBLY AND LIQUID CRYSTAL DISPLAY DEVICE HAVING THE SAME}

Figure 1a is an exploded perspective view showing a conventional direct type liquid crystal display device.

1B is a plan view and detailed view of a conventional direct backlight assembly;

FIG. 1C is a cross-sectional view taken along the line II ′ of FIG. 1B. FIG.

FIG. 1D is a view illustrating edge darkening of a conventional direct type liquid crystal display. FIG.

Figure 2a is an exploded perspective view showing a direct type backlight assembly according to the present invention.

2B is a plan view of a direct type backlight assembly according to the present invention;

Figure 3a is a perspective view showing a direct type liquid crystal display device according to the present invention.

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

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

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

130: optical sheet 140, 140 ': first and second support side

150: external electrode fluorescent lamp 160, 160 ': first and second power supply terminal

161: screw 162: second hole

164: slit 165: fastening portion

170: bottom case 171: first hole

200: Terminal Guide

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backlight assembly, and more particularly, to a backlight assembly and an LCD having the same, which improve edge darkening.

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.

Since the liquid crystal display is a light-receiving device that displays an image by adjusting the amount of light source coming from the outside, a separate light source for irradiating light to the liquid crystal panel, that is, a backlight assembly, is required. According to the position, it is divided into direct type and edge type.

The direct type includes a light source disposed on a rear surface of the liquid crystal panel and incident parallel rays perpendicular to the liquid crystal panel, and the edge type includes a light source disposed at one end of the liquid crystal panel to change an optical path to the light guide plate to change the light path. It is to irradiate parallel light perpendicular to.

The edge type is mainly applied to a liquid crystal display device having a relatively small size, such as a monitor of a laptop computer and a desktop computer, and has good light uniformity, a long durability life, and is advantageous for thinning a liquid crystal display device.

On the other hand, the direct type has been developed chiefly as the size of the liquid crystal display device began to be enlarged to 20 inches or more, and a plurality of light sources are disposed on the rear surface of the liquid crystal panel to direct light directly to the front of the liquid crystal panel.

The direct type is mainly used for a large screen liquid crystal display device requiring high luminance because the light utilization efficiency is higher than that of the edge type.

FIG. 1A is an exploded perspective view showing a conventional direct type liquid crystal display, FIG. 1B is a plan view and a detailed view of a conventional direct type backlight assembly, and FIG. 1C is cut along the line II ′ of FIG. 1B. It is a cross section.

As shown in FIGS. 1A to 1C, the conventional direct type liquid crystal display device includes a liquid crystal panel 10 and a backlight assembly 20 for providing light to the liquid crystal panel 10.

The backlight assembly 20 is disposed on the bottom case 70 at predetermined intervals and emits light, and the backlight assembly 20 is disposed at both ends of the light source 50. The fastened first and second power supply terminals 60 and 60 ', an optical sheet 30 disposed on the light source 50 to diffuse and collect light, and the first and second power supply terminals ( And first and second support sides 40 and 40 'disposed on the optical sheets 30 and 60'.

The bottom case 70 serves to improve the luminance imbalance during driving by changing the path of light in the form of inclined side surfaces.

The light source 50 is an external electrode fluorescent lamp (EEFL), and electrodes are formed at both ends of the outside, and the plurality of light sources 50 are coupled to the first and second power terminals 60 and 60 'in parallel. The same voltage is applied to each of the light sources 50 through a wire 69 connected to the first and second power terminals 60 and 60 'in a connected form.

The first and second power supply terminals 60 and 60 'are provided with a plurality of holes 62 at predetermined intervals so as to be fixed by the screw 61.

In order to fix the light source 50 without flow, both sides of the first and second power terminals 60 and 60 'are extended and fixed to the corner region of the bottom case 70 by a predetermined distance (C).

The conventional direct type liquid crystal display has the following problems.

FIG. 1D is a view illustrating edge darkening of a conventional direct type liquid crystal display. FIG.

As shown in FIG. 1D with reference to FIG. 1A, the edge type phenomenon S of the conventional direct type liquid crystal display is generated.

The dark phenomenon S is provided with first and second power supply terminals 60 and 60 'for fixing the light source 50, so that a predetermined interval of each of the plurality of light sources 50 is arranged (see FIG. 1B). A) of the liquid crystal panel 10 corresponding to the area of the gap (B) by the difference in the distance (B of FIG. 1B) between the light source 50 provided at both ends and the inclined side surface of the bottom case 70 The problem that luminance decreases on both sides arises.

An object of the present invention is to provide a backlight assembly and a liquid crystal display device having the same, by forming a terminal guide having a right angle shape in a predetermined space at both ends of the inclined side surface of the bottom case.

In order to achieve the above object, the backlight assembly of the present invention,

A light source disposed at predetermined intervals to emit light;

First and second power terminals to which the light source is fixed and power is applied; And

And a bottom case formed at right angles in a corner region of the terminal guide, in which both ends of the first and second power terminals are extended and seated.

In the liquid crystal display device according to the present invention,

A light source disposed at predetermined intervals to emit light;

A liquid crystal panel which displays a predetermined image by using light emitted from the light source;

First and second power terminals to which the light source is fixed and power is applied; And

And a bottom case formed at right angles in a corner region of the terminal guide, in which both ends of the first and second power terminals are extended and seated.

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

2A is an exploded perspective view showing a direct backlight assembly according to the present invention, and FIG. 2B is a plan view of the direct backlight assembly according to the present invention.

As shown in FIG. 2A and FIG. 2B, the direct type backlight assembly 120 of the present invention is used in a large size liquid crystal display, and is provided on the bottom case 170 and the bottom case 170 to provide light. A plurality of external electrode fluorescent lamps (EEFL, 150) emitting light, first and second power terminals 160 and 160 'for fixing and applying power to the external electrode fluorescent lamps 150, and the first and second The first and second side supports 140 and 140 ′ disposed on the second power terminals 160 and 160 ′ to support the optical sheet 130 are included.

The optical sheet 130 disposed on the external electrode fluorescent lamp 150 may include a diffusion sheet and a diffusion plate, and the optical sheet 130 may include an external electrode fluorescent lamp ( The light generated from 150 is scattered to have a uniform distribution as a whole.

The bottom case 170 has a plurality of terminal guides (200) having a vertical side surface at right angles to the ends of both inclined sides, and for fixing the first and second power terminals (160, 160 '). A plurality of first holes 171 are formed.

The terminal guide 200 may be connected to both ends of the first and second power terminals 160 and 160 ', and the first and second power terminals 160 and 160' may be seated and fastened. It is formed wider than the width F of the first and second power supply terminals (160, 160 ').

The terminal guide 200 is formed at the time of manufacturing the bottom case 170 and is integrally formed with the bottom case 170.

The terminal guide 200 extends the first and second power terminals 160 and 160 'by a predetermined distance C' in the lateral direction of the bottom case 170 to the inclined side of the bottom case 170. It is formed to place the electrode fluorescent lamp 150 closer.

The first and second power supply terminals 160 and 160 ′ have a plurality of fastening parts 165 formed to be spaced apart from each other with slits 164 to fix the electrodes of the external electrode fluorescent lamp 150; First to fourth electrode lines 166, 167, 168, and 169 formed at both sides of the fastening part 164, and a plurality of second holes 162 to which the screw 161 is fastened.

The fastening part 165 is a gripper type and is formed to surround the electrodes 151 at both ends of the external electrode fluorescent lamp 150, and at least two or more slits 164 are formed in the middle of the electrodes 151. It is possible to improve the poor contact with, and to maximize the contact area with the electrode 151 can improve the electrical continuity / conductivity.

The first to fourth power lines 166, 167, 168, and 169 may be formed of an opaque metal, or may be formed of a transparent metal.

First to fourth electrode lines 166, 167, 168 and 169 at both ends of the first and second power terminals 160 and 160 ′ are seated on the terminal guide 200 of the bottom case 170. The screw 161 is fastened to the first and second holes 171 and 162.

The screw 161 is connected by being fastened to the first and second power terminals 160 and 160 ′, the circular electrode 180 enclosing the screw 161, and one side of the circular electrode 180 is a wire. Since it is connected to the 181, it can be connected to the inverter (not shown) (not shown) connected to the other side of the wire 181 without soldering.

In the direct type liquid crystal display of the present invention, the terminal guides 200 having right angles are formed at both end regions of both sides of the bottom case 170 inclined to move the first and second power terminals 160 and 160 'to both sides. Can be. Therefore, the external electrode fluorescent lamps 150 fixed to the first and second power supply terminals 160 and 160 'are disposed at a predetermined distance close to both inclined side surfaces of the bottom case 170 so that the luminance of both sides of the conventional liquid crystal panel is reduced. The degradation can be improved.

3A is a perspective view illustrating a direct type liquid crystal display according to the present invention, FIG. 3B is a cross-sectional view taken along the line II-II 'of FIG. 3A, and FIG. 3C is a cut along the line III-III' of FIG. 3A. One cross section.

As shown in FIGS. 3A to 3C, in the direct type liquid crystal display of the present invention, the same components as those of FIGS. 2A and 2B are denoted by the same reference numerals, and detailed description thereof will be omitted.

The direct type liquid crystal display of the present invention includes a liquid crystal panel 110 for displaying an image and a backlight assembly 120 for providing light to the liquid crystal panel 110.

The rear surface of the liquid crystal panel 110 is provided with an optical sheet 130 which is disposed at a predetermined interval to diffuse and focus the light.

As shown in FIG. 3B, the plurality of external electrode fluorescent lamps 150 are fastened and fixed to the fastening part 165 of the first power terminal 160. The first and second power lines 166 and 167 at both ends of the first power terminal 160 are fixed by a screw 161 on the terminal guide 200 formed at the corner region of the bottom case 170. .

The terminal guide 200 is formed at right angles to the corner region of the inclined side surface of the bottom case 170 and is formed at the time of manufacturing the bottom case 170 to be integrated with the bottom case 170.

Both ends of the first power terminal 160 may be moved a predetermined distance C ′ in the direction of the terminal guide 200 by the terminal guide 200 of the bottom case 170.

As shown in FIG. 3C, the first power supply terminal 160 is moved by a predetermined distance C ′, and the external electrode fluorescent lamps 150 provided at both sides of the plurality of external electrode fluorescent lamps 150 that emit light are provided. ) Means that the bottom case 170 can be disposed in close proximity to both inclined side surfaces of the bottom case 170.

In the plurality of light sources of the present invention, since the light source spacing A 'and the spacing B' between the inclined side surface and the edge light source of the bottom case 170 are eliminated, the light generated from the light source is shown. As in the optical path (→), the liquid crystal panel 110 is uniformly irradiated.

In the direct type liquid crystal display of the present invention as described above, a terminal guide 200 having a right angle shape is formed in the corner region of the bottom case 170 so as to space the first and second power terminals 160 and 160 'at predetermined intervals (C). ') By moving it can be disposed close to the inclined side of the bottom case 170.

Accordingly, by lowering the light sources fixed to the first and second power supply terminals 160 and 160 ′ in a direction in which both bottom surfaces of the bottom case 170 are inclined at a predetermined distance, brightness reduction of both sides of the conventional liquid crystal panel can be improved. .

As described above, according to the present invention, by forming a terminal guide having a right-angle shape in the corner region of the bottom case to move the power supply terminal to which the light source is fixed to the predetermined interval side to place the light source closer to both sides of the bottom case. Can be. Therefore, there is an effect of improving the lowering of the brightness of the edge.

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 (10)

Light sources arranged at predetermined intervals; First and second power supply terminals for fixing the light source; And And a bottom case in which a terminal guide on which both ends of the first and second power terminals are seated is formed at a right angle in a corner region. The method of claim 1, The terminal guide is a backlight assembly, characterized in that formed integrally with the bottom case. The method of claim 1, And a width of each of the first and second power terminals is smaller than that of the terminal guide. The method of claim 1, And a second hole corresponding to a plurality of first holes formed in the first and second power terminals so that the first and second power terminals are fastened by screws on both sides of the bottom case. The method of claim 1, And a reflector for reflecting light is applied or attached onto the bottom case. A light source disposed at predetermined intervals to emit light; A liquid crystal panel which displays a predetermined image by using light emitted from the light source; First and second power terminals to which the light source is fixed and power is applied; And And a bottom case having a terminal guide extending from both ends of the first and second power terminals and seated at right angles to a corner region thereof. The method of claim 6, And the terminal guide is integrally formed with the bottom case. The method of claim 6, The width of the first and second power supply terminal is smaller than the width of the terminal guide. The method of claim 6, Liquid crystal display device characterized in that the second case corresponding to the plurality of first holes formed in the first and second power terminals to be fastened by the screw on both sides of the bottom case. . The method of claim 6, And a reflecting plate for reflecting light is coated or attached on the bottom case.

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