KR20080074337A - Backlight unit - Google Patents

Abstract

A backlight unit is provided to minimize assembling defective factors and to obtain an excellent surface light source device by simply fixing a clip to a normal position. A backlight unit includes a surface light source device(100), a bottom chassis(200), and a clip(900). The surface light source device includes a light source body having an inner space in which discharge gas is injected and an electrode applying a discharge voltage to the discharge gas. The bottom chassis receives the surface light source device. The clip transfers the discharge voltage to the electrode. A fixing portion is provided in one of the bottom chassis and the clip, and fixes the clip to the bottom chassis. The clip clips the electrode in a state when it is fixed to the bottom chassis.

Description

Backlight Unit {BACKLIGHT UNIT}

1 is an exploded perspective view showing a conventional backlight unit.

2 is an exploded perspective view showing the backlight unit of the first embodiment of the present invention.

3 is an exploded perspective view of the clip of FIG. 2;

4 is a combined perspective view of the clip of FIG. 3.

5 is an exploded perspective view showing a backlight unit of a second embodiment of the present invention.

6 is a perspective view of the clip of FIG. 5.

7 is an exploded perspective view showing a backlight unit of a third embodiment of the present invention.

8 is a perspective view of the clip of FIG. 7.

9 is an exploded perspective view showing a backlight unit of a fourth embodiment of the present invention.

The present invention relates to a backlight unit, and more particularly, to a backlight unit having a structure in which a clip is fixed to a bottom chassis.

BACKGROUND ART A liquid crystal display device, which is rapidly increasing in demand, is a display device that displays an image by controlling an amount of light coming from the outside by using a liquid crystal injected between a TFT substrate and a color filter substrate.

However, since the liquid crystal display does not have a self-luminous ability, a separate backlight unit for irradiating light to the liquid crystal is necessary. The performance of the backlight unit greatly affects the display quality of the liquid crystal display.

As a light source of a conventional backlight unit, a cold cathode fluorescent lamp (CCFL) having a rod shape or a light emitting diode (LED) having a dot shape is mainly used.

Cold cathode fluorescent lamps have the advantage of high brightness, long life, and very low heat generation compared to incandescent lamps. In addition, the light emitting diode also has an advantage of high luminance. However, cold cathode fluorescent lamps or light emitting diodes are poor in brightness uniformity.

Accordingly, a backlight unit having a cold cathode fluorescent lamp or a light emitting diode as a light source may include an optical member such as a light guide panel (LGP), a diffusion member, a prism sheet, or the like to increase luminance uniformity. optical member).

Therefore, a liquid crystal display using a cold cathode fluorescent lamp or a light emitting diode has a problem in that volume and weight are greatly increased by an optical member. In order to solve this problem, a surface light source device in the form of a flat plate has been proposed.

1 is an exploded perspective view illustrating a backlight unit having a conventional surface light source device 100.

As illustrated, the backlight unit of FIG. 1 includes a bottom chassis 200, a surface light source device 100, and a clip 900. In addition, a lower holder 300, an upper holder (not shown), a mold 400, a diffusion plate 600, an optical sheet 700, a fixing frame 800 and an inverter 500 are included.

The surface light source device 100 includes a light source body 110 and an electrode 150. The electrode 150 is formed along both edges of the light source body 110.

As illustrated, when the electrode 150 is formed on the first substrate 120 and the second substrate 130 of the light source body 110, the electrodes 150 and the second electrode formed on the first substrate 120, respectively. The clip 900 is used to electrically connect the electrodes 150 formed on the substrate 130 and to apply a discharge voltage to each electrode 150.

The clip 900 is fixed by soldering to the surface light source device 100.

The conventional backlight unit of the above structure has the following problems.

First, thermal shock and residual stress are caused on the glass substrate by soldering with high temperature. This causes cracks in the glass substrate and leads to defects in the surface light source device 100. As a result, the surface light source device 100 may be damaged or cause a poor lighting, which may deteriorate the quality reliability.

Second, due to the solder material has a problem of poor environmental friendliness.

Third, in terms of stability of quality, expensive solders cannot be used, resulting in a cost increase.

Fourth, there is a problem that the process time according to the soldering operation is increased.

Fifth, work defects due to movement and flow of the clip 900 and unskilled operator during soldering work are large.

The present invention has been made to solve the above problems, and an object of the present invention is to eliminate the need for soldering work in fixing the clip to the surface light source device, thereby preventing cracks and defects in advance, and ultimately excellent quality To provide a surface light source device of.

It is another object of the present invention to contribute to productivity improvement by simplifying the process.

In addition, the present invention has a further object to provide a surface light source device of excellent quality ultimately by minimizing the assembly failure factor by allowing the clip to be fixed in place easily.

In addition, the present invention has another object to contribute to the construction of environmentally friendly manufacturing process and product production by eliminating the use of lead harmful to the human body.

In addition, the present invention has another object to contribute to cost reduction by avoiding the use of expensive solder.

In order to achieve the above object, the present invention provides a surface light source device having a light source body having an internal space in which discharge gas is injected, and an electrode for applying a discharge voltage to the discharge gas, and a bottom for receiving the surface light source device. And a clip for transmitting a discharge voltage to the electrode, and at least one of the bottom chassis and the clip is provided with a fixing part for fixing the clip to the bottom chassis, and the clip is fixed to the bottom chassis. It provides a backlight unit, characterized in that for clipping the electrode in the state.

Preferably, the fixing portion includes an insertion hole formed in the bottom chassis, the clip is configured to be inserted from the outside through the insertion hole.

Preferably, the bottom chassis and / or the clip is provided with an insulating guard for insulating between the body of the bottom chassis and the conductive body of the clip.

Preferably, the clip is detachably assembled to the bottom chassis.

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

2 is an exploded perspective view illustrating a backlight unit of the first embodiment of the present invention, FIG. 3 is an exploded perspective view of the clip 900 of FIG. 2, and FIG. 4 is a combined perspective view of the clip 900 of FIG. 3.

As illustrated, the surface light source device 100 includes a light source body 110 and an electrode 150.

The light source body 110 has an internal space in which discharge gas is injected. As the discharge gas, mercury gas, argon gas, neon gas, xenon gas, krypton gas, or the like may be used. These may be used alone or in combination.

The light source body 110 includes a first substrate 120 and a second substrate 130. Edges of the first substrate 120 and the second substrate 130 are sealed to form internal spaces between the first substrate 120 and the second substrate 130.

The first substrate 120 includes the partition wall 121 integrally. Therefore, the light source body 110, that is, the first substrate 120 has a curved shape. The first substrate 120 is typically made of a glass material that transmits visible light and blocks ultraviolet light.

In some embodiments, the partition wall may be integrally formed on the second substrate, or the partition wall may be integrally formed on both the first substrate and the second substrate. Furthermore, the partition wall may be interposed between the first substrate and the second substrate independently of the first substrate and the second substrate. In this case, typically a sealing member is interposed along the edge of a 1st board | substrate and a 2nd board | substrate.

The partition wall 121 divides the inner space into a plurality of discharge spaces. In the present embodiment, the plurality of discharge spaces are partitioned to form independent spaces, but according to the embodiment, the plurality of discharge spaces may be connected to each other to have a serpentine shape.

The discharge space can be changed into various shapes such as trapezoidal, semicircular, circular, semi-elliptic, and elliptical.

A fluorescent layer (not shown) is formed on an inner surface of the first substrate 120 defining the discharge space. A reflection layer (not shown) is formed on an inner surface of the second substrate 130 defining the discharge space, and a fluorescent layer (not shown) is formed on the reflection layer.

The electrode 150 applies a discharge voltage to the discharge gas. When a discharge voltage is applied to the discharge gas through the electrode 150, barrier discharge occurs in the discharge space to generate ultraviolet rays. The generated ultraviolet rays excite the fluorescent layer to generate visible light. The generated visible light passes through the first substrate 120 and is emitted.

Meanwhile, the electrode 150 includes a material having excellent conductivity, for example, copper (Cu), nickel (Ni), silver (Ag), gold (Au), aluminum (Al), chromium (Cr), and the like. The electrode 150 may be formed by attaching a conductive tape made of the material to the outer circumferential surface of the substrate or coating a metal powder of the material on the outer circumferential surface of the substrate.

The electrodes 150 are formed along the edges of both sides of the light source body 110, respectively. In some embodiments, island electrodes may be formed in each discharge space instead of the strip-shaped electrodes.

The clip 900 is clipped to the edge of the surface light source device 100 in which the electrode 150 is formed to connect the upper electrode formed on the upper surface of the light source body 110 and the lower electrode formed on the lower surface of the light source body 110 to transmit the discharge voltage.

The clip 900 has a conductive body 910 and an insulation guard.

The conductive body 910 is made of a conductive material. The conductive body 910 is connected to the power wire to transfer the discharge voltage to the upper electrode and the lower electrode.

The conductive body 910 has contact portions 911 contacting the electrodes 150 at both ends thereof. Conductive body 910 has a connector 913 for connection with a power wire. The connector 913 is crimped while the power wire is bitten by the connector 913 to fix the power wire.

The insulation guard is made of an insulating material. The insulating guard contacts the fixing part of the bottom chassis 200 while covering the conductive body 910 so that the discharge voltage does not leak to the bottom chassis 200.

The insulation guard includes a first insulation guard 930 and a second insulation guard 920. The first insulating guard 930 is provided on the outer side of the conductive body 910, and primarily aims to insulate the bottom chassis 200. The second insulating guard 920 is provided inside the conductive body 910 and has a primary purpose of preventing crystallization of the frit, which is an adhesive bonding the edges of the first and second substrates 120 and 130. In some embodiments, the second insulating guard 920 may be deleted.

A coupling protrusion 931 is formed on an inner surface of the first insulating guard 930, and a coupling hole 921 is formed on an outer surface of the second insulating guard 920 so that the first insulating guard 930 and the second insulating guard 920 are formed. Is assembled detachably. In some embodiments, the first insulation guard 930, the conductive body 910, and the second insulation guard 920 may be integrally formed by insert injection molding, or the like.

A locking projection 933 is formed on the outer surface of the insulating guard.

In the second insulating guard 920, a drawing path 935 for drawing out the connector 913 and the wire extends to the outside.

The bottom chassis 200 accommodates the surface light source device 100. The clip 900 and the bottom chassis 200 are provided with fixing parts for fixing the clip 900 to the bottom chassis 200. In the embodiment of Figure 2, the fixing portion is a locking projection 933 of the clip 900 and the insertion hole 210 of the bottom chassis 200.

The clip 900 is fixed to the bottom chassis 200 by inserting the clip 900 from the outside through the insertion hole 210. The fixing here is not only to allow the relative movement of the clip 900 and the bottom chassis 200 at all, but also to be detached from the state in which the clip 900 is inserted only in the insertion hole 210 of the bottom chassis 200. Even if it is possible, it is inserted in the insertion hole 210 and at the same time the clipped state of the surface light source device 100, the fixed position so as not to deviate from the fixed position includes.

The locking protrusion 933 of the clip 900 is caught by the inner surface of the bottom chassis 200 so as to fix the clip 900 so as not to be separated from the bottom chassis 200. The clip 900 has a degree of elasticity in itself and is detachably assembled to the insertion hole 210 of the bottom chassis 200.

Looking at the installation process of the clip 900, the surface light source device 100 is seated in the bottom chassis 200, and then the clip 900 is inserted into the insertion hole 210 from the side to clip to the surface light source device 100.

In FIG. 2, the clip 900 is clipped to the surface light source device 100 in a direction orthogonal to the discharge space. However, the clip 900 may be clipped to the surface light source device along a direction parallel to the discharge space. In this case, the insertion hole should be formed at the short side of the bottom chassis.

In addition, although FIG. 2 illustrates an embodiment in which the insulation guard is formed on the clip, it is also possible for the insulation guard to be formed on the bottom chassis and to make the insulation guard contact the conductive body of the clip. In this case, the first insulating guard of the clip can be deleted.

In addition, the present specification shows an embodiment in which the fixing part for fixing the clip to the bottom chassis includes an insertion hole, but is not necessarily limited thereto. In addition, even if the insertion hole is formed, it may be formed on the bottom plate of the bottom chassis instead of the sidewall of the bottom chassis.

5 is an exploded perspective view illustrating a backlight unit of a second embodiment of the present invention, and FIG. 6 is a perspective view of the clip 900 of FIG. 5.

5 shows an embodiment in which the clip 900 is fixed to the bottom chassis 200 by using a screw (not shown).

Here, the fixing portion for fixing the clip 900 to the bottom chassis 200, the insertion hole 210 and the screw hole 217 of the bottom chassis 200 and the bracket 936 and screws (not shown) of the clip 900 to be. A screw hole 937 is formed in the bracket 936 of the clip 900.

FIG. 7 is an exploded perspective view showing a backlight unit of a third embodiment of the present invention, and FIG. 8 is a perspective view of the clip 900 of FIG. 7.

As shown, it shows that the clip 900 can be fixed to the bottom chassis 200 by hook coupling instead of screw coupling of FIG. Here, the fixing part for fixing the clip 900 to the bottom chassis 200 is an insertion hole 210 and a fixing hole 218 of the bottom chassis 200 and a hook 938 of the clip 900.

The hook 938 of the clip 900 is inserted into the fixing hole 218 of the bottom chassis 200 to fix the clip 900 so as not to be separated.

9 is an exploded perspective view showing a backlight unit of a fourth embodiment of the present invention.

As shown in the drawing, the backlight unit includes an upper holder, a mold 400, a diffusion plate 600, an optical sheet 700, and a fixing unit in addition to the surface light source device 100, the clip 900, the bottom chassis 200, and the lower holder. Frame 800 and inverter 500.

Although the bottom chassis 200 and the clip 900 employ the bottom chassis 200 and the clip 900 of FIG. 5 for illustrative purposes, various other structures may be used.

The upper holder (not shown) dissipates high temperature heat generated by contact with the electrode 150 at the top of the surface light source device 100.

The mold 400 is seated on the bottom chassis 200 at the top of the surface light source device 100. The diffusion plate 600 is mounted on the mold 400.

The diffusion plate 600 diffuses the light emitted from the surface light source device 100 to increase the luminance uniformity.

The optical sheet 700 may include a prism sheet. The prism sheet provides straightness to the light diffused by the diffusion plate 600 to increase the front brightness.

The fixing frame 800 is coupled to the bottom chassis 200 to fix the diffusion plate 600 and the optical sheet 700. In the liquid crystal display, the liquid crystal panel is positioned above the fixed frame 800.

The inverter 500 drives the surface light source device 100 by generating a high voltage discharge voltage and supplying the discharge voltage to the electrode 150.

According to the above configuration, the present invention can provide a surface light source device of finally excellent quality by removing the soldering operation in fixing the clip to the light source body in advance to prevent the occurrence of cracks and defects.

In addition, the present invention can contribute to productivity improvement by eliminating the soldering work time involved in fixing the conventional clip.

In addition, the present invention can be easily fixed to the clip in place without the soldering operation to minimize the assembly failure factor, thereby providing a surface light source device of excellent quality eventually.

In addition, the present invention can contribute to the construction of environmentally friendly manufacturing process and product production by eliminating the use of lead harmful to the human body.

In addition, the present invention can contribute to cost reduction by avoiding the use of expensive solder.

Claims (5)

A surface light source device having a light source body having an internal space into which discharge gas is injected, and an electrode for applying a discharge voltage to the discharge gas; A bottom chassis for storing the surface light source device; It comprises a clip for transmitting a discharge voltage to the electrode, At least one of the bottom chassis and the clip is provided with a fixing part for fixing the clip to the bottom chassis, and the clip clips the electrode while being fixed to the bottom chassis. According to claim 1, The fixing part includes an insertion hole formed in the bottom chassis, And the clip is insertable from the outside through the insertion hole. According to claim 1, The fixing unit is formed in the bottom chassis, the backlight unit, characterized in that it comprises an insulating guard in contact with the clip. According to claim 1, And the clip has a conductive body connected to a power wire and an insulating guard in contact with the bottom chassis. According to claim 1, And the clip is detachably assembled to the bottom chassis.

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