KR20080080764A

KR20080080764A - Backlight unit and liquid cristal display device usimg the same

Info

Publication number: KR20080080764A
Application number: KR20070020895A
Authority: KR
Inventors: 이상대
Original assignee: 엘지디스플레이 주식회사
Priority date: 2007-03-02
Filing date: 2007-03-02
Publication date: 2008-09-05

Abstract

A backlight unit and an LCD(Liquid Crystal Display) using the same are provided to reflect light, concentrated in an edge part of an LC panel, into a bottom cover by forming a side reflection member in a side support, thereby improving color uniformity at the edge part. Both sides of a bottom cover(110) are opened. Plural LED(Light Emitting Diode) arrays(160) are arranged in the bottom of the bottom cover in parallel. In the plural LED arrays, plural LED packages(120) are mounted. Side supports(140a,140b) are coupled with both sides of the opened bottom cover, and reflect light from the LED package. The side support includes a side reflection member(170) for performing mirror reflection of the light of the LED package.

Description

BACKLIGHT UNIT AND LIQUID CRISTAL DISPLAY DEVICE USIMG THE SAME}

1 is a view showing a backlight unit according to an embodiment of the present invention.

2 is a diagram illustrating a backlight unit according to a first embodiment of the present invention;

3 is a diagram illustrating a backlight unit according to a second embodiment of the present invention;

4 is a diagram illustrating a backlight unit according to a third embodiment of the present invention;

5 illustrates a liquid crystal display according to an exemplary embodiment of the present invention.

100: backlight unit 110: bottom cover

120: LED package 130: flat reflective member

140a, 140b: side support 150: diffusion member

160: printed circuit board 170: side reflective member

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly, to a backlight unit and a liquid crystal display device using the same so that color mixing is well performed at a corner of the backlight unit.

Recently, various flat panel display devices that can reduce weight and volume, which are disadvantages of cathode ray tubes, have emerged. Such flat panel displays include a liquid crystal display, a field emission display, a plasma display panel, a light emitting display, and the like.

The liquid crystal display device displays an image by adjusting the light transmittance of the liquid crystal using an electric field. To this end, the liquid crystal display includes a liquid crystal panel having a liquid crystal cell, a backlight unit for irradiating light to the liquid crystal panel, and a driving circuit for driving the liquid crystal cell.

In this case, the liquid crystal panel of the liquid crystal display device is a light-receiving element that displays an image by adjusting the amount of light source coming from the outside, so a back light unit, which is a separate light source for irradiating light to the liquid crystal panel, is required. do. Such a backlight unit is classified into an edge method and a direct method according to the installed position.

At this time, in the edge method, the backlight unit is installed on the side of the light guide plate for guiding the light, and irradiates light emitted from the backlight unit toward the light guide plate.

In addition, in the direct method, a plurality of LEDs are arranged in a row on the lower surface of the bottom cover to directly irradiate light directly to the front surface of the liquid crystal panel.

Here, as a light source of a general backlight unit, a discharge lamp such as a cold cathode fluorescent lamp (CCFL) or an external electrode fluorescent lamp (EEFL) is mainly used, but recently, toxic mercury ( Increasingly, LEDs (light emitting diodes) that can improve color reproducibility without using Ag are increasingly used.

On the other hand, the conventional backlight unit using the LED realizes the white light by mixing the light emitted from the red (R), green (G), blue (B) LED.

However, a plurality of LEDs formed on the bottom surface of the bottom cover are well mixed in the center of the bottom cover, but the color of the specific LED is not good at the corner portion is difficult to achieve a problem that the color of the specific LED is generated.

Accordingly, in order to solve the above problems, the present invention is to provide a backlight unit and a liquid crystal display device using the same so that the color is mixed well at the corner of the backlight unit.

According to an aspect of the present invention, there is provided a backlight unit including a bottom cover having both sides opened; A plurality of LED arrays having a plurality of LED packages mounted on the bottom surface of the bottom cover; And side supports coupled to both sides of the opened bottom cover to reflect light from the LED package.

In addition, the backlight unit and the liquid crystal display using the same according to an embodiment of the present invention includes a backlight unit; A bottom cover to accommodate the backlight unit; A liquid crystal panel mounted on the front of the backlight unit; A support main surrounding an edge of the liquid crystal panel and the backlight unit; It is configured to include a top cover formed to cover the front edge of the liquid crystal panel.

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

1 is a view showing a backlight unit according to an embodiment of the present invention, Figure 2 is a view showing a backlight unit according to a first embodiment of the present invention.

1 and 2, in the backlight unit 100 according to the first embodiment of the present invention, a bottom cover 110 having both sides opened and a plurality of LED packages 120 are mounted on the bottom. A plurality of LED arrays 160 arranged side by side on the bottom surface of the cover, and side supports 140a and 140b coupled to both sides of the opened bottom cover 110 to reflect light from the LED package 120. It is composed.

The bottom cover 110 is a bottom case accommodating the backlight unit 100 and includes a plurality of LED arrays 160, a planar reflecting member 130, and a plurality of optical members 150.

The plurality of LED arrays 120 are installed on the printed circuit board on the bottom surface of the bottom cover 110, the plurality of LED packages 120 are installed side by side at regular intervals. In this case, each of the plurality of LED packages 120 may be formed of red (R), green (G), and blue (B) LEDs emitting red (R), green (G), and blue (B) light. Here, the green (G) LED of each LED package 120 may be one or more.

The planar reflecting member 130 has a plurality of holes through which the respective LED packages 120 can be inserted and formed so that only the plurality of LED packages 120 covering the LED array 160 to emit light can protrude thereon. So that it is formed. At this time, the planar reflecting member 130 diffuses the point light sources emitted from the plurality of LED packages 120 formed at regular intervals and at the same time mixes the colors of the red (R), green (G), and blue (B) LEDs. It is formed to improve.

In the optical member 150, a diffusion plate and a plurality of optical members are sequentially stacked on the butter cover 110. In this case, the diffusion plate diffuses the light emitted from the plurality of LED packages 120 to the entire area of the liquid crystal panel 100.

In addition, the plurality of optical sheets allow light diffused by the diffusion plate to be perpendicular to the liquid crystal panel 100. Here, the plurality of optical sheets may be at least one prism sheet for collecting light diffused by the diffusion plate.

The side supports 140a and 140b are formed at both edges of the bottom cover 110 facing each other to support the plurality of optical members 150. At this time, the side support (140a, 140b) is configured to include a side reflecting member 170 for mirror reflecting the light of the LED 120 package into the bottom cover (110).

The side reflecting member 170 mirrors the light emitted from the LED packages 120a and 120b at the edge portions adjacent to the side supports 140a and 140b. In this case, the side reflection member 170 may prevent the color uniformity from falling by dispersing the light concentrated on the edges and corners of the liquid crystal panel.

3 is a diagram illustrating a backlight unit according to a second embodiment of the present invention.

Referring to FIG. 3, the backlight unit according to the second embodiment of the present disclosure includes a plurality of LEDs 220 formed on the printed circuit board 260 on the bottom surface of the bottom cover 210; A planar reflecting member 230 reflecting light generated from the plurality of LEDs 220; A plurality of optical members 250 disposed on the bottom cover 210; It is configured to include a side support (240a, 240b) of the "<", ">" formed side reflection member 270 that reflects the plurality of LED 220 light from the side mirror.

4 is a view illustrating a third embodiment of the present invention, in which the configuration of the drawings according to the second embodiment is the same, and the side supports 240a and 240b having the shapes " " and " " Is formed.

In addition, the site support may be formed in "(", ")", "" "and" / "form so that the colors of the LED package can be mixed well.

Accordingly, the backlight unit 100 of the present invention forms side reflection members 270 on the side supports 240a and 240b to reflect the light concentrated at the corners into the backlight unit, thereby providing four corners and edges. By improving the color mixing that occurs incompletely in the portion can improve the color uniformity of the entire liquid crystal panel.

5 is a view showing a liquid crystal display of the present invention.

Referring to FIG. 5, the liquid crystal display according to the exemplary embodiment of the present invention includes a backlight unit 300, a bottom cover 310, a liquid crystal panel 390, a support main 380, and a top cover 400. It is composed.

The backlight unit 300 is formed of the backlight unit of the present invention as shown in FIG. 1. In this case, the backlight unit 300 may be formed in the form of a side support as shown in FIGS. 3 and 4.

The liquid crystal panel 390 includes a transistor array substrate and a color filter array substrate bonded to each other, a spacer (not shown) for maintaining a constant cell gap between the two array substrates, and a liquid crystal layer filled in the liquid crystal space provided by the spacers. It is configured to include (not shown).

The color filter array substrate includes a color filter, a common electrode, a black matrix, and the like. Here, the common electrode may be formed on the transistor array substrate.

The transistor array substrate is formed in a region defined by a plurality of data lines (not shown) and a plurality of gate lines (not shown), and is connected to a thin film transistor (not shown) connected to the gate line and the data line, and connected to the thin film transistor. It is configured to include a liquid crystal cell (not shown).

The support main 380 is coupled to the bottom cover 310 at the rear thereof, and the top cover 400 having a rectangular rim shape that borders the edge of the liquid crystal panel 390 is assembled to the support main 380 and the bottom cover 310. Is fastened.

The bottom cover 310 is formed of a bottom case coupled to the support main 380 and accommodating the backlight unit 300.

The top cover 400 surrounds the front edge of the liquid crystal panel 390 disposed on the bottom cover 310 and the side surface of the bottom cover 310. To this end, the top cover 400 includes a non-display area except for the display area of the liquid crystal panel 390, that is, a flat part covering the edge and a side part bent vertically from the flat part to surround the side of the bottom cover 310. It is configured by.

On the other hand, the present invention described above is not limited to the above-described embodiment and the accompanying drawings, it is possible that various substitutions, modifications and changes within the scope without departing from the technical spirit of the present invention It will be apparent to those skilled in the art.

According to an exemplary embodiment of the present invention, a backlight unit and a liquid crystal display using the same may include a side reflection member formed on a side support to reflect light concentrated at an edge portion of a liquid crystal panel into an interior of a bottom cover. Color uniformity can be improved in the part.

Claims

A bottom cover having both sides opened;

A plurality of LED arrays having a plurality of LED packages mounted on the bottom surface of the bottom cover;

And a side support coupled to both sides of the opened bottom cover to reflect light from the LED package.

The method of claim 1,

The side support is a back light unit, characterized in that it comprises a side reflection member for reflecting the light of the LED package.

The method of claim 1,

The LED package formed on the outer side of the bottom cover is a backlight unit, characterized in that the close to the side support so that the color mixing is good.

The method of claim 1,

The side support is a back light unit, characterized in that the vertical section is formed at a right angle.

The method of claim 1,

The side support is a back light unit, characterized in that formed in the form of any one of the "<", ">", "(", ")", "/" and "" ".

A liquid crystal panel which displays an image by adjusting light transmittance;

A liquid crystal display device comprising the backlight unit of claim 1 to irradiate light onto the liquid crystal panel.