KR20080006380A - Backlight assembly and display device including same - Google Patents

Abstract

Disclosed are a backlight assembly and a display device including the same, which improve brightness and improve productivity. The backlight assembly includes a plurality of point light sources arranged in a line on a first surface of a printed circuit board, a light guide plate having a light incident surface adjacent to the light sources, an exit surface for emitting guided light, and a bottom surface. It has a side wall extending from the bottom surface, and the accommodating container and the incident surface for receiving the point light sources and the light guide plate and the one side of each point light source facing the incidence surface is bonded, and the opposite side of the first surface of the printed circuit board And an adhesive tape for adhering the second side and the storage container. Accordingly, the adhesive tape is disposed between the point light source and the light guide plate, thereby minimizing the refraction of the light emitted by the point light source and improving the brightness by dispersing the light into the incident surface. This simplifies the assembly process.

Description

BACK LIGHT ASSEMBLY AND DISPLAY APPARATUS HAVING THE SAME}

1 is an exploded perspective view of a display device according to a first exemplary embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along the line II ′ of FIG. 1.

3 is a cross-sectional view of a display device according to a second exemplary embodiment of the present invention.

4 is a cross-sectional view of a display device according to a third exemplary embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

1000: display device 100: light source

110: point light source 120: printed circuit board

200: adhesive tape 300: light guide plate

310: entrance surface 320: exit surface

400: display unit 700: storage container

710: bottom surface 720: side wall

800: top chassis 122: light emitting diode chip

The present invention relates to a backlight assembly and a display device including the same, and more particularly, to a backlight assembly and a display device including the same having improved brightness and productivity.

In general, a liquid crystal display device includes a liquid crystal display panel including an array substrate, a color filter substrate, and a liquid crystal layer, and a backlight assembly for providing light required for performing the display of the liquid crystal display panel.

The backlight assembly includes a lamp unit, a light guide plate and optical sheets. The lamp unit generates light required by the liquid crystal display panel, and a cold cathode fluorescent lamp (CCFL) or a light emitting diode (LED) is used as a light source of the lamp unit. The light emitting diode is smaller than other light sources, has a long lifetime, and has low power and good efficiency because electrical energy is directly converted into light energy.

However, there is an air gap between the light emitting diode and the incident surface of the light guide plate, which causes a problem of light loss. Light loss due to the air gap depends on the size of the air gap, but is known to be approximately 10% or more. Although it is best to remove the air gap, it is not easy to remove the air gap in consideration of assembly tolerances in the process of assembling the display device.

In order to minimize the light loss, an additional material is formed between the light emitting diode and the incident surface to remove the air gap. For example, after injecting a silicon material, the silicon material may be cured to obtain the effect of light dispersion and luminance improvement by the same effect as the absence of the air gap. Such a process is called a coupling process, and the addition of the coupling process as described above causes a complexity of the process and a cost increase.

Accordingly, the technical problem of the present invention was conceived in this respect, and an object of the present invention is to provide a backlight assembly in which light is dispersed to improve brightness, and a manufacturing process is simplified to improve productivity.

Another object of the present invention is to provide a display device including the same.

According to an embodiment of the present invention, a backlight assembly includes a plurality of point light sources arranged in a line on a first surface of a printed circuit board, and an incident surface to which the light is incident adjacent to the point light sources. A light guide plate having an exit surface for emitting guided light, a bottom surface and a side wall extending from the bottom surface, a storage container accommodating the point light sources and the light guide plate, and an angle facing the incident surface and the incident surface An adhesive tape is attached to one surface of the point light source, and the second surface, which is opposite to the first surface of the printed circuit board, and the storage container.

According to another aspect of the present invention, there is provided a display device including a plurality of point light sources arranged in a line on a first surface of a printed circuit board, and an incident surface to which the light is incident adjacent to the point light sources. And a display unit including a light guide plate having an exit surface for emitting guided light, a display unit disposed on the exit surface and displaying an image, a bottom surface and sidewalls extending from the bottom surface. Bonding a light source, the light receiving plate and the display unit to accommodate the display unit, and one surface of each point light source facing the incidence surface and the incidence surface, and a second surface opposite to the first surface of the printed circuit board; And it is characterized in that it comprises an adhesive tape for adhering the storage container.

According to the backlight assembly and the display device including the same, an adhesive tape is disposed between the point light source and the light guide plate to minimize the refraction of the light emitted by the point light source to the incident surface, thereby minimizing the loss of light and simultaneously dispersing the light. Brightness can be improved. By simply attaching the adhesive using the adhesive tape, the storage container and the point light source may be combined to simplify the assembly process.

Hereinafter, with reference to the accompanying drawings, it will be described in detail a preferred embodiment of the present invention.

1 is an exploded perspective view of a display device according to a first exemplary embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along the line II ′ of FIG. 1.

1 and 2, the display device 1000 includes a display unit 400, a backlight assembly that provides light to the display unit 400, and a top chassis 800 that is coupled to the storage container 700. .

The display unit 400 includes a lower substrate 410, an upper substrate 420 facing the lower substrate 410, and a first polarizing plate attached to one surface of the lower substrate 410 and the upper substrate 420, respectively. 412 and a second polarizing plate 422. A liquid crystal layer (not shown) is interposed between the lower substrate 410 and the upper substrate 420.

The lower substrate 410 has a switching element, for example, a thin film transistor, which is electrically connected to a pixel electrode (not shown), and the upper substrate 420 has a color filter layer. The display unit 400 displays an image by using electrical and optical characteristics of the liquid crystal molecules of the liquid crystal layer. Since the liquid crystal molecules do not generate light by themselves and only adjust the light transmittance, they need light to perform a display. To this end, the backlight assembly is disposed under the display unit 400.

The backlight assembly may include a light source plate 100 for generating light, an adhesive tape 200, a light guide plate 300, an optical member 500, and a reflection for outputting light generated from the light source 100 to the display unit 400. The seat 600 and the storage container 700 are included.

The light source unit 100 includes a printed circuit board 120 and a plurality of point light sources 110 arranged in a line on the first surface of the printed circuit board 120. The printed circuit board 110 is provided with a positive electrode line (not shown) and a negative electrode line (not shown) for applying a driving current supplied from the outside to the point light source 110.

The point light source 110 is, for example, a light emitting diode (LED). The point light sources 110 include a light emitting diode chip and a box-shaped cap covering the light emitting diode chip, and the point light sources 110 are aligned on the first surface of the printed circuit board 120. Side by side are arranged at predetermined intervals.

 The light guide plate 300 guides the light emitted from the light source unit 100 and emits light in the direction in which the display unit 400 is formed. The light source unit 100 is disposed on one side of the light guide plate 300. The light guide plate 300 faces the point light source 110 and receives an incident surface 310 to which light emitted from the light source unit 100 is incident, and the light incident from the incident surface 310 perpendicular to the incident surface 310. And an exit surface 320 to exit.

An adhesive tape 200 is disposed between the point light sources 110 and the incident surface 310. The adhesive tape 200 may use a transparent and adhesive material such as an acrylic adhesive or a silicone adhesive.

The adhesive tape 200 is disposed between one surface of the point light source 110 that emits the light facing the incident surface 310 and the incident surface 310. By being disposed on the one surface of the point light source 110 and the incident surface 310, a predetermined space formed between the point light source 110 and the incident surface 310, for example, assembly tolerance is eliminated. The light emitted from the point light source 110 by removing the predetermined space may be uniformly incident on the incident surface 310.

The adhesive tape 200 extends from one surface of the point light source 110 so as to be opposite to the first surface of the printed circuit board 120 on which the point light sources 110 are disposed, and the storage container 700. The printed circuit board 120 and the bottom surface 710 are disposed between the bottom surface 710.

Accordingly, the adhesive tape 200 may uniformly spray the light, and may improve the brightness. After injecting a silicon material between the conventional light emitting diode and the incident surface, it may be coupled using the adhesive tape 200 without undergoing an additional process such as a coupling process of curing the silicon material.

At the same time, by combining the storage container 700 and the light source unit 100 using the adhesive tape 200, the manufacturing process can be simplified, and the manufacturing cost can be reduced.

The optical member 500 is disposed above the exit surface 320 of the light guide plate 300. The optical member 500 includes, for example, a diffusion sheet for diffusing light and a prism sheet for condensing light, thereby changing a path of light emitted from the light guide plate 300 to the display unit 400 to improve brightness characteristics of the light. .

The reflective sheet 600 is disposed below the second surface facing the exit surface 320 of the light guide plate 300, and reflects the light exiting through the second surface to enter the light guide plate 300 to provide light. Improve the use efficiency

The storage container 700 supports and accommodates the display unit 400, the light source unit 100, and the light guide plate 300. The storage container 700 includes a bottom surface 710 and sidewalls 720 extending from the bottom surface 710 and perpendicular to the bottom surface 710. The display unit 400, the light source unit 100, and the light guide plate 300 are accommodated in a predetermined storage space formed by the bottom surface 710 and the sidewalls 720. The reflective sheet 600 and the printed circuit board 120 combined with the adhesive tape 200 are disposed on the bottom surface 710.

On the display unit 400, a top chassis 800 including an opening that exposes an area in which the display unit 400 displays an image and facing and coupled to the sidewall 720 of the storage container 700 is disposed. The top chassis 800 fixes the display unit 400 and is coupled to the storage container 700 to accommodate the display unit 400, the light guide plate 300, and the light source unit 100.

3 is a cross-sectional view of a display device according to a second exemplary embodiment of the present invention.

Referring to FIG. 3, a reflective sheet 600, a light guide plate 300, an optical member 500, a lower substrate 410, and an upper substrate 420 are formed on a bottom surface 710 of the storage container 700. The display units 400 are sequentially stacked and received, and the light source unit 100 is disposed to face the incident surface 310 of the light guide plate 300.

The light source unit 100 is disposed such that the second surface and the sidewall 720 of the printed circuit board 120 on which the point light source 110 is formed face each other. The adhesive tape 200 is disposed between the point light source 110 and the incident surface 310 so that light emitted from the point light source 110 is uniformly incident on the incident surface 310.

The adhesive tape 200 extends from the incident surface 310 to be disposed between the second surface of the printed circuit board 120 and the side wall 720 so that the point light source 110 includes the light guide plate 300 and the storage container 700. The printed circuit board 120 is attached to the sidewall 720 of the storage container 700.

4 is a cross-sectional view of a display device according to a third exemplary embodiment of the present invention.

Referring to FIG. 4, the light guide plate 300, the light source unit 100 facing the incident surface 310 of the light guide plate 300, and the display unit 400 are accommodated on the bottom surface 710 of the storage container 700. .

The light source unit 100 is formed by mounting the LED chip 122 on the printed circuit board 120. The point light source chip 122 is directly mounted on the first surface of the printed circuit board 120, and the second surface and the sidewall 720 are disposed to face each other. An adhesive tape 200 is simultaneously wrapped around the first surface and the second surface of the printed circuit board 120 to attach the light source unit 100 to the light guide plate 300 and the storage container 700.

Since the LED chip 122 is directly mounted on the first surface of the printed circuit board 120, and the adhesive tape 200 is attached to the first surface, the adhesive tape 200 and the LED chip 122 are attached. The contact area of is wide, and a stable structure can be formed.

Also in the luminance, the third embodiment has a higher luminance than in the first and second embodiments. Specifically, as in the first and second embodiments, the point light source 110 is used as a package including a light emitting diode chip and a cap covering the light emitting diode chip, and as in the third embodiment, a light emitting diode chip ( In order to compare the luminance in case of using 122), a total of 42 white light emitting diodes were applied to the 12.1 inch backlight assembly and the center tape was measured using the adhesive tape 200 as an acrylic double-sided adhesive tape. In the case of 245 nits, the light emitting diode chip 122 is relatively brighter when the light emitting diode chip 122 is used at 268 nits.

As described in detail above, the coupling between the incident surface 310 and the light source unit 100 using the adhesive tape 200 enables the coupling simply by attaching the adhesive tape 200. The process can be simplified and the brightness can be improved. The manufacturing process may be simplified by combining the storage container 700 and the light source unit 100 using the adhesive tape 200.

According to such a backlight assembly and a display device including the same, luminance may be improved by minimizing light loss and at the same time by dispersing light by simply attaching the adhesive using an adhesive tape. An adhesive tape may be used to couple the storage container and the point light source to simplify the assembly process and improve productivity.

Although described with reference to the embodiments above, those skilled in the art will understand that the present invention can be variously modified and changed without departing from the spirit and scope of the invention as set forth in the claims below. Could be.

Claims (6)

A plurality of point light sources arranged in a line on the first surface of the printed circuit board; A light guide plate having an incident surface to which light is incident adjacent to the point light sources and an exit surface to emit guided light; A storage container having a bottom surface and sidewalls extending from the bottom surface, and containing the point light sources and the light guide plate; And And an adhesive tape for adhering the incident surface and one surface of each point light source facing the incident surface, and adhering a second surface opposite to the first surface of the printed circuit board and the storage container. Backlight assembly. The method of claim 1, wherein when the second surface of the printed circuit board is disposed on the bottom surface of the storage container, And the adhesive tape which adheres the incident surface and one surface of the point light source to adhere the second surface and the bottom surface. The method of claim 1, wherein when the second surface of the printed circuit board is disposed facing the side of the storage container, And the adhesive tape which adheres the incident surface and one surface of the point light source to adhere the second surface and the sidewall via the bottom surface of the storage container. The method of claim 3, wherein the point light source And a light emitting diode chip mounted on the first surface. The method of claim 1, wherein the point light source A light emitting diode chip mounted on the first surface, and a cap covering the light emitting diode chip, And the adhesive tape attaches the cap and the storage container. A plurality of point light sources arranged in a line on the first surface of the printed circuit board; A light guide plate having an incident surface to which light is incident adjacent to the point light sources and an exit surface to emit guided light; A display unit disposed on the exit surface and including a display panel for displaying an image; A storage container having a bottom surface and sidewalls extending from the bottom surface, for storing the point light sources, the light guide plate, and the display unit; And And an adhesive tape for adhering the incident surface and one surface of each point light source facing the incident surface and adhering a second surface opposite to the first surface of the printed circuit board and the storage container. Display device.

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