KR20110066054A - Backlight unit and liquid crystal display device having the same - Google Patents

Abstract

PURPOSE: A backlight unit and a liquid crystal display device having the same are provided to prevent the damage of the liquid crystal display device due to an external pressure. CONSTITUTION: A backlight unit comprises one or more light source(153) for emitting light, a light guide plate(140) placed in parallel with the light source for changing a pot light to a plane light, and a bottom cover(170) in which one or more reinforcing part is included corresponding to the arrangement of the light source. The reinforcing part is seamlessly connected along the side longitudinal direction of the bottom cover.

Description

BACKLIGHT UNIT AND LIQUID CRYSTAL DISPLAY DEVICE HAVING THE SAME}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backlight unit, and more particularly, to a backlight unit capable of improving damage caused by external pressure and a liquid crystal display device having the same.

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

Therefore, in the trend of miniaturization and weight reduction of various electronic products, CRT has a certain limit in weight and size, and is expected to replace the liquid crystal display (LCD) and gas discharge using electro-optic effects. Plasma Display Panel (PDP) and Electro Luminescence Display (ELD) using the electroluminescent effect, and the like, among them, researches on liquid crystal displays are being actively conducted.

BACKGROUND ART Liquid crystal display devices have tended to be gradually widened due to their light weight, thinness, and low power consumption. Accordingly, in order to meet the needs of users, liquid crystal display devices are progressing in the direction of large area, thinning, and low power consumption.

BACKGROUND ART A liquid crystal display device is a display device that displays an image by controlling an amount of light passing through a liquid crystal, and is widely used for advantages such as thinning and low power consumption.

Unlike the CRT, the liquid crystal display is not a display device that emits light by itself, and thus, a back light unit including a separate light source is provided on the rear surface of the liquid crystal display panel to provide light for visually representing an image. .

The backlight unit is divided into an edge method and a direct method according to the position of the light source.

The edge type backlight unit is mainly applied to a relatively small liquid crystal display device such as a monitor of a laptop computer and a desktop computer, and has good light uniformity, a long life, and an advantage in thinning a liquid crystal display device. .

The direct type backlight unit began to be developed mainly as the size of the liquid crystal display device became larger than 20 inches, and a plurality of light sources were disposed on the lower surface of the diffuser plate to direct light directly to the front of the liquid crystal display panel. will be. Such a direct type backlight unit 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 method.

Recently, as the liquid crystal display device becomes slimmer, the configuration of the edge type liquid crystal display device is simplified.

However, in general, a liquid crystal display device has a problem in that the thickness of a mold or a metal case becomes thin due to slimming, and thus, the overall strength decreases, and it is easily bent due to external pressure, thereby causing damage to the liquid crystal display panel as well as the configuration of the backlight unit. .

SUMMARY OF THE INVENTION An object of the present invention is to provide a backlight unit and a liquid crystal display device having the same capable of improving damage caused by external pressure.

The backlight unit according to an embodiment of the present invention,

At least one light source for emitting light; A light guide plate provided in parallel with the light source and converting point light incident from the light source into surface light; And a bottom cover having at least one strength reinforcing part protruding downward in an area corresponding to the area where the light source is disposed.

In addition, the liquid crystal display device of the present invention,

At least one light source for emitting light; A light guide plate provided in parallel with the light source and converting point light incident from the light source into surface light; A support frame having a rectangular frame shape in which the light source and the light guide plate are accommodated; And a bottom cover having at least one strength reinforcing part protruding downward in an area corresponding to the area where the light source is disposed.

The liquid crystal display of the present invention is provided with a strength reinforcing portion bent in a downward direction on one side of the bottom cover to compensate for the strength of the bottom cover, it is possible to improve the damage caused by the bending of the liquid crystal display from the external pressure.

In addition, the present invention has the advantage that the support main thickness is increased by the height of the protrusion of the strength reinforcing portion provided on one side of the bottom cover, thereby improving the strength of the liquid crystal display.

According to another exemplary embodiment of the present invention, a liquid crystal display device includes a first strength reinforcement part having a structure bent downward in one side of a bottom cover, and a second strength reinforcement part having a structure bent downward in another direction and provided with a strength of the bottom cover. By supplementing the above, damage due to the bending of the liquid crystal display device from external pressure can be improved.

In addition, the present invention has the advantage that the thickness of both side surfaces of the support main may be increased by the height of the first and second strength reinforcement portions provided on one side and the other side of the bottom cover, respectively, to improve the strength of the liquid crystal display.

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

1 is an exploded perspective view illustrating a liquid crystal display according to an exemplary embodiment of the present invention, FIG. 2 is a perspective view illustrating a bottom cover of the present invention, and FIG. 3 is cut along the line II ′ of FIG. 1. It is sectional drawing which shows a liquid crystal display device.

1 to 3, the liquid crystal display according to the exemplary embodiment of the present invention is provided with a liquid crystal display panel 110 on which an image is displayed, and is disposed under the liquid crystal display panel 110 to provide light. It includes a backlight unit 120 to.

The liquid crystal display panel 110 includes a color filter substrate 111 and a thin film transistor substrate 113 bonded to face each other to maintain a uniform cell gap, and a liquid crystal layer interposed between the two substrates.

Although not illustrated in detail, the color filter substrate 111 and the thin film transistor substrate 113 will be described in detail. In the thin film transistor substrate 113, a plurality of gate lines and data lines cross each other to define pixels. A thin flim transistor (TFT) is provided at each of the crossing regions of the transistors, and is connected in a one-to-one correspondence with pixel electrodes mounted on each pixel. The color filter substrate 111 includes a color filter of R, G, and B colors corresponding to each pixel, a black matrix bordering each of them, and covering a gate line, a data line, a thin film transistor, and the like, and a common electrode covering all of them. Include.

A driving PCB 115 is provided at the edge of the liquid crystal display panel 110 to supply driving signals to the gate line and the data line.

The driving PCB 115 is electrically connected to the liquid crystal display panel 110 by a chip on film 117. Here, the COF 117 may be changed to a tape carrier package (TCP).

The backlight unit 120 disposed below the liquid crystal display panel 110 may include a rectangular box shape bottom cover 170 having an upper surface opened, and a printed circuit board 151 provided on an inner surface of one side of the bottom cover 170. ) And a plurality of light emitting diodes 153 mounted on the printed circuit board 151.

The backlight unit 120 is disposed in parallel with the light emitting diode 153 to convert the point light into the surface light, and the light disposed under the light guide plate 140 to travel under the light guide plate 140 to the liquid crystal display panel. It further includes a reflective sheet 160 for reflecting in the (110) direction, and optical sheets 130 disposed on the light guide plate 140 for diffusing and condensing light emitted from the light guide plate 140.

In addition, the backlight unit 120 accommodates the printed circuit board 151, the light emitting diode 153, the light guide plate 140, the optical sheets 130, and the reflective sheet 160, and the bottom cover 170. It further includes a support main 119 made of a mold of a rectangular frame shape to be coupled.

The optical sheets 130 include a diffusion sheet for diffusing light, a light collecting sheet for collecting the diffused light, and a protective sheet for protecting the light collecting pattern formed on the light collecting sheet.

The bottom cover 170 is made of a metal material, the strength reinforcement 200 is provided on one side lower.

The intensity reinforcing part 200 corresponds to an area where the light emitting diode 153 is disposed.

The strength reinforcement 200 is integrally formed with the bottom cover 170 in a structure protruding in one side downward direction of the barb cover 170.

The strength reinforcing part 200 extends without breaking in the length direction of one side of the bottom cover 170 in which the light emitting diode 153 is disposed.

The strength reinforcing part 200 may include a first surface 201 that is bent downward from a bottom surface of the bottom cover 170 and an extension of the first surface 201 and bent in an outer direction of the bottom cover 1170. The second surface 203 and the third surface 205 extending from the second surface 203 and bent upwards of the bottom cover 170 are included.

The strength reinforcement part 200 has a function of compensating the strength of the bottom cover 170 by the first to third surfaces 201, 203, and 205 that are bent in different directions.

The support main 119 corresponding to one side of the bottom cover 170 on which the strength reinforcement unit 200 is disposed has a thickness thicker than the height of the strength reinforcement unit 200 as compared with the support main of the general liquid crystal display device. .

That is, the thickness d of the support main 119 of the present invention has a height higher than that of the general support main by the height of the strength reinforcement 200 formed on one side of the bottom cover 170, thereby providing a liquid crystal display device. Secondary supplement to strength.

The liquid crystal display according to the exemplary embodiment of the present invention described above is provided with a strength reinforcement 200 having a structure bent downward in one side of the bottom cover 170 to compensate for the strength of the bottom cover 170. The damage caused by the bending of the liquid crystal display device can be improved from the pressure of.

In addition, the present invention has the advantage that the thickness of the support main 119 is increased by the height of the protruding height of the strength reinforcing portion 200 provided on one side of the bottom cover 170, thereby improving the strength of the liquid crystal display.

4 is an exploded perspective view illustrating a liquid crystal display according to another exemplary embodiment of the present invention, and FIG. 5 is a cross-sectional view of the liquid crystal display cut along the line II-II ′ of FIG. 4.

4 and 5, the liquid crystal display according to another embodiment of the present invention is the same as the liquid crystal display according to an embodiment of the present invention except for the backlight unit 220, the same reference numerals The detailed description will be omitted.

The backlight unit 220 according to another exemplary embodiment of the present invention may include a bottom cover 270 having a rectangular box shape having an upper surface, a first light source unit 250a provided at one inner surface of the bottom cover 270, and A second light source unit 250b provided on the other inner surface of the bottom cover 270, a light guide plate 140 disposed in parallel with the first and second light source units 250a and 250b, and the light guide plate A reflection sheet 160 disposed below the light guide plate 140 to reflect the light traveling toward the lower portion of the light guide plate 140 toward the liquid crystal display panel 110, and disposed on the light guide plate 140 and irradiated from the light guide plate 140. It further includes optical sheets 130 for diffusing and condensing light.

The first light source unit 250a includes a first printed circuit board 251a and a plurality of first light emitting diodes 253a mounted on the first printed circuit board 251a.

The second light source unit 250b includes a second printed circuit board 251b and a plurality of second light emitting diodes 253b mounted on the second printed circuit board 251b.

The bottom cover 270 is made of a metal material, and has a first strength reinforcement 300a at one lower side and a second strength reinforcement 300b at the other lower side.

The first intensity reinforcement 300a corresponds to an area in which the first light source unit 250a is disposed, and the second intensity reinforcement 300b corresponds to an area in which the second light source unit 250b is disposed.

The first and second strength reinforcement parts 300a and 300b are formed to protrude in the downward direction of the barb cover 270.

The first and second strength reinforcement parts 300a and 300b extend without a break in the length direction of one side and the other side of the bottom cover 270.

The first strength reinforcement 300a extends from the first surface 301a that is bent downward from the bottom surface of the bottom cover 270 and extends from the first surface 301a to the outside of the bottom cover 270. The second surface 303a which is bent and the third surface 305a which extends from the second surface 303a and bends upwards of the bottom cover 270 are included.

The second strength reinforcement part 300b extends from the fourth surface 301b bent downward from the bottom surface of the bottom cover 270, and extends from the fourth surface 301b to the outside of the bottom cover 270. A fifth surface 303b that is bent includes a sixth surface 305b that extends from the fifth surface 303b and bends upward in the bottom cover 270.

The first and second strength reinforcement portions 300a and 300b are bottomed by the first to third surfaces 301a, 303a and 305a and the fourth to sixth surfaces 301b, 303b and 305b which are bent at different angles. It has a function to complement the strength of the cover 270.

The support mains 119 corresponding to one side and the other side of the bottom cover 270 on which the first and second strength reinforcement parts 300a and 300b are disposed have first and second strengths in comparison with the support mains of the general liquid crystal display. It has a thickness that is as thick as the protruding height of the reinforcing parts (300a, 300b).

That is, both side thicknesses d1 and d2 of the support main 119 are thicker than the general support mains as protruding heights of the first and second strength reinforcing parts 300a and 300b formed on one side and the other side of the bottom cover 270. By having a height, the strength of the liquid crystal display device is secondarily compensated.

The liquid crystal display according to the exemplary embodiment of the present invention described above is provided with a first strength reinforcing part 300a having a structure bent downward in one side of the bottom cover 270, and having a structure bent downward in the other direction. 2, the strength reinforcing part 300b is provided to compensate for the strength of the bottom cover 270, thereby improving damage due to the bending of the liquid crystal display from external pressure.

In addition, according to the present invention, the thicknesses of both sides of the support main 119 are increased by the heights of the first and second strength reinforcing parts 300a and 300b provided at one side and the other side of the bottom cover 270, respectively. It has the advantage of improving the strength.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical 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.

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

Figure 2 is a perspective view of the bottom cover of the present invention.

3 is a cross-sectional view illustrating a liquid crystal display device taken along the line II ′ of FIG. 1.

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

FIG. 5 is a cross-sectional view illustrating the liquid crystal display device taken along the line II-II ′ of FIG. 4.

Claims (8)

At least one light source for emitting light; A light guide plate provided in parallel with the light source and converting point light incident from the light source into surface light; And And a bottom cover having at least one strength reinforcing part protruding downward in an area corresponding to the area where the light source is disposed. The method according to claim 1, The strength reinforcing portion is a backlight unit, characterized in that made of a structure extending without breaking in the longitudinal direction of the bottom cover. The method according to claim 1, The strength reinforcement part, A first surface bent downward from a bottom surface of the bottom cover; A second surface extending from the first surface and bent in a lower direction of the bottom cover; And And a third surface extending from the second surface and bent in an upper direction of the bottom cover. The method according to claim 1, The strength reinforcing unit is a backlight unit, characterized in that formed on both lower surfaces of the bottom cover facing each other. At least one light source for emitting light; A light guide plate provided in parallel with the light source and converting point light incident from the light source into surface light; A support frame having a rectangular frame shape in which the light source and the light guide plate are accommodated; And And a bottom cover having at least one strength reinforcing part protruding downward in a region corresponding to the region where the light source is disposed. 6. The method of claim 5, And the strength reinforcing portion is formed to extend in a lateral length direction of the bottom cover without disconnection. 6. The method of claim 5, The strength reinforcement part, A first surface bent downward from a bottom surface of the bottom cover; A second surface extending from the first surface and bent in a lower direction of the bottom cover; And And a third surface extending from the second surface and bent in an upper direction of the bottom cover. 6. The method of claim 5, And the thickness of the support main is changed according to the thickness of the strength reinforcing part.

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