KR20050095927A - Lcd backlight assembly - Google Patents

Abstract

The present invention discloses a liquid crystal display backlight assembly having improved electrical fastening property between a common electrode to which lamps are fastened and an inverter wire for applying power to the lamps in a direct type liquid crystal display. Disclosed is a liquid crystal display device comprising a liquid crystal panel and a backlight assembly including a lamp, the common electrode including a common electrode terminal and an uneven connection terminal to which the lamps are fastened, and a concave-convex connection terminal of the common electrode. And it characterized in that it comprises a wire connected to the inverter.

Here, the wire edge is fastened to the concave-convex connection terminal further comprises a concave-convex ring terminal, the connection terminal and the ring terminal fastened to the wire of the common electrode is fastened by a screw formed with a plurality of threads, from the inverter The power supplied is characterized in that the fastening structure is applied to the common electrode through the wire, ring terminal, connecting terminal.

Description

Liquid Crystal Display Backlight Assembly {LCD BACKLIGHT ASSEMBLY}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display backlight assembly having improved electrical fastness between an inverter for applying power to liquid crystal display lamps and a common electrode, thereby improving electrical reliability.

Recently, due to the rapid development of technology in the semiconductor industry, liquid crystal display devices are being manufactured with smaller and lighter weight and more powerful products. Cathode ray tube (CRT), which is widely used in information display devices, has many advantages in terms of performance and price, but has many disadvantages in terms of miniaturization or portability.

On the other hand, liquid crystal displays have been attracting attention as an alternative means of overcoming the shortcomings of CRTs because they have advantages such as miniaturization, light weight, and low power consumption. Currently, almost all information processing devices that require display devices are required. The situation is attached to.

Such liquid crystal displays generally apply voltages to specific molecular arrays of liquid crystals to convert them into other molecular arrays, and change optical properties such as birefringence, photoreactivity, dichroism, and light scattering characteristics of liquid crystal cells that emit light by such molecular arrays. Is a display device using modulation of light by a liquid crystal cell by converting the light into a visual change.

Recently, various structures have been developed for slimming and lightening in order to secure the competitiveness of the product. One of them stacks and combines the backlight assemblies, which are optical units, on the liquid crystal display panel in which the array substrate and the color filter substrate are bonded together, and inserts them into the main frame to protect them. A display mold frame structure is fabricated.

In particular, a direct type liquid crystal display device applied to a large size is used as a display device for a monitor or a TV by placing a plurality of lamps inside the lower cover.

1 is a view schematically illustrating an assembly structure of a general liquid crystal display device.

As shown in FIG. 1, the liquid crystal panel 11 including the array substrate in which a plurality of pixels are formed in a matrix form and the color filter substrate in which R, G, and B color filters are formed in a matrix form are bonded to each other. An upper polarizing plate 13a and a lower polarizing plate 13b are disposed above and below the panel 11, respectively.

A plurality of optical sheets 15 are disposed below the liquid crystal panel 11 to improve light efficiency, and a plurality of lamps 19 disposed below the optical sheets 15 in a direct type liquid crystal display device. A diffusion plate 17 is arranged to diffuse light generated from the light into planar light.

As described above, in the case of a direct type liquid crystal display, a plurality of lamps 19 are arranged in a row between the diffusion plate 17 and the lower cover 20, and the lamps 19 are sequentially driven. (Line inversion) Displays the liquid crystal display.

Although not shown in the drawing, in the side edge type liquid crystal display, a light guide plate is used instead of the diffusion plate 17 to generate plane light, and a reflector is disposed between the light guide plate and the lower cover. In the direct type liquid crystal display, a reflective film (not shown) is generally coated on the lower cover 20 to propagate light emitted from the lamps 19 to the liquid crystal panel 11. .

The lamps 19 disposed in the direct type liquid crystal display are driven by receiving power from an inverter disposed inside or outside the lower cover 20.

2 is a diagram illustrating a lamp assembly structure of a liquid crystal display according to the prior art.

As shown in FIG. 2, a plurality of lamps 19 are disposed on the lower cover 20 at predetermined intervals, and the lamp terminals 19a of the lamps 19 are disposed on the lower cover 20. It is fastened to the common electrode terminals 22a of the common electrode 22 arrange | positioned on each.

The common electrode 22 disposed on the inner surface of the lower cover 20 receives power from an inverter (not shown) disposed outside, and is disposed inside the lower cover 20. Power is supplied to the plurality of lamps 19.

A path for supplying power to the lamps 19 is connected to the common electrode 22 disposed on the inner side of the lower cover 20 from the inverter disposed on the rear or outer side of the lower cover 20. Supply. Power supplied from the inverter is supplied to the lamp terminals 19a coupled to the common electrode terminals 22a, and then turns on the lamps 19.

In this case, between the inverter and the common electrode 22 disposed on the inner side of the lower cover 20, a wire 25 is used to electrically connect the common electrode 22 to the edge of the wire 25. The ring terminal 31 which is fastened is electrically connected to the connection terminal 40 of the common electrode 22 by a screw 30.

A method of fastening the wire 25 and the common electrode 22 disposed inside the lower cover 20 will be described in detail as follows.

A ring terminal 28 having a hole formed in the center thereof is fastened to an edge of the wire 25 connected to the inverter in order to fasten the connection terminal 40 of the common electrode 22 using the screw 30. It is.

The ring terminal 28 is inserted into the screw 30, the spring washer 31 is inserted together to maintain the fastening even when the screw 30 is loosened.

FIG. 3 is an enlarged view of the coupling between the common electrode and the inverter wire in FIG. 2. As illustrated, the inverter for supplying power to the lamps 19 disposed in the direct type liquid crystal display device may be connected to a wire ( The power is supplied to the lamps 19 disposed inside the lower cover through 25.

The ring terminal 28 which is fastened to one edge of the wire 25 is fastened to the screw 30 together with the spring washer 31 and then to a hole formed in the connection terminal 40 of the common electrode 22. Is fastened.

The screw 30 passes through a hole formed in the connection terminal 40 to be coupled to the lower cover.

Accordingly, the ring terminal 28 and the connection terminal 40 are coupled between the screw 30 and the connection terminal with the ring terminal 28 and the spring washer 31 fastened to the wire 25 interposed therebetween. Is electrically fastened.

At this time, the spring washer 31 prevents the electrical coupling capability between the ring terminal 28 and the common electrode 22 from dropping when the fastening force of the screw 30 is reduced by vibration or shock applied from the outside.

Therefore, the spring washer 31 can maintain the electrical coupling force between the ring terminal 28 and the common electrode 22 even if the coupling force of the screw 30 is decreased, thereby reducing the lamp 19 of the liquid crystal display device. Electrical reliability can be secured.

However, when the screw loosened due to vibration or external shock caused by the screw fastened to the lower cover as described above, there is a problem that the electrical coupling force between the ring terminal and the common electrode falls.

In addition, there is a limit to maintain the coupling force by the spring washer for maintaining the electrical coupling force between the ring terminal and the common electrode against the screw loosening phenomenon.

That is, since the spring washer serves to maintain the coupling force between the common electrode and the ring terminal by the thickness of the washer rather than its elastic force, when the loosening degree of the screw is longer than the thickness of the spring washer, the common electrode and the ring The coupling force with the terminal cannot be maintained.

In the prior art, since an additional part called a spring washer is used in the process, the production cost and the process are complicated.

According to the present invention, in order to increase the electrical coupling force of the lamps disposed in the direct type liquid crystal display device, the connection terminal of the common electrode disposed inside the lower cover has a concave-convex structure having elastic force, so that the common electrode and the wire despite the screw loosening An object of the present invention is to provide a liquid crystal display backlight assembly capable of improving electrical reliability.

In order to achieve the above object, the liquid crystal display backlight assembly according to the present invention,

A liquid crystal display device comprising a liquid crystal panel and a backlight assembly including a lamp,

And a wire connected to the inverter while being fastened with the common electrode terminal and the uneven type connecting terminal to which the lamps are fastened, and the uneven type connecting terminal of the common electrode.

Here, the wire edge is fastened to the concave-convex connection terminal further comprises a concave-convex ring terminal, the connection terminal and the ring terminal fastened to the wire of the common electrode is fastened by a screw formed with a plurality of threads, from the inverter The power supplied is characterized in that the fastening structure is applied to the common electrode through the wire, ring terminal, connecting terminal.

According to the present invention, in order to increase the electrical coupling force of the lamps disposed in the direct type liquid crystal display, the connection terminal of the common electrode disposed inside the lower cover has an uneven structure having elastic force, so that the common electrode and The electrical reliability of the wire can be improved.

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

4 is a diagram illustrating a lamp assembly structure of the liquid crystal display according to the present invention.

As shown in FIG. 4, the plurality of lamps 119 used in the direct type liquid crystal display are parallel to each other and disposed on the lower cover 120 at a predetermined distance.

The lamp terminal 119a of the lamps 119 is electrically coupled to the common electrode terminal 122a of the common electrode 122 disposed on the lower cover 120, and the common electrode 122 is It is fixedly disposed inside the lower cover 120.

One side of the common electrode 122 is bent to form a concave-convex connection terminal 140 so as to receive power from an inverter disposed at an outer side or a rear side of the lower cover 120.

The wire 125 is connected to an inverter to transfer power supplied from the inverter to the common electrode 122 to supply power to the lamps 119.

The screw 130 is used to increase the electrical connection between the wire 125 and the common electrode 122. The screw 130 is a connection terminal 140 formed at one side of the common electrode 122. The wire 125 is electrically connected to each other while being fastened to the wire.

In particular, the ring terminal 128 is fastened to one side edge of the wire 125 to maintain the fastening property with the connection terminal 140 of the common electrode 122 while increasing the fastening property with the screw 130. It was.

The structure of the ring terminal 128 is also bent similarly to the connection terminal 140 of the common electrode 122 to have an uneven structure. However, bending the ring terminal 128 is optional since the connection terminal 140 is bent.

In the present invention, in order to increase the electrical reliability between the common electrode 122 and the wire 125 connected to the inverter, the connection terminal 140 and the ring terminal 128 both have an example of a bent structure.

Therefore, in the present invention, the spring washer used in the prior art was removed, and the connection terminal 140 of the common electrode 122 was bent to have an uneven shape to have elastic force.

In addition, the structure of the ring terminal 128 in contact with the connection terminal 140 also used a bent structure.

Therefore, the power supplied from the inverter is electrically connected to the wire 125 for applying power to the common electrode 122 disposed inside the lower cover 120 by the common electrode 122 and the screw 130. Connected.

In detail, the screw 130 is fastened to the lower cover 120 by inserting the screw 130 in the hole formed in the ring terminal 128 and the connection terminal 140.

At the same time, the ring terminal 128 is electrically connected to each other by an elastic force generated in the uneven structure of the connection terminal 140, even if the screw 130 is loosened by an external shock or vibration, the connection terminal 140. The elastic force of) has the advantage of excellent electrical connection effect.

FIG. 5 is a diagram illustrating the structure of the common electrode and the ring terminal of FIG. 4. As shown in FIG. 5, the common electrode 122 is fastened to the wire edge of the structure of the common electrode 122 disposed on the lower cover 120. Ring terminals 128 and (b) are shown.

The connection terminal 140 of the common electrode 122 has a concave-convex structure in order to form elastic force and height.

A predetermined elastic force is generated by the bending of the connection terminal 140. The elastic force functions to make a strong connection with the wire connected to the inverter.

Therefore, in the present invention, there is no need to directly connect the wire and the connection terminal 122a of the common electrode 122 by screw, and there is no need to fasten an additional spring washer, thereby simplifying the process.

In addition, the ring terminal 128 may be bent to form a concave-convex structure similarly to the concave-convex shape by bending the connection terminal 122a of the common electrode 122.

That is, only the connection terminal 122a of the common electrode 122 disposed on the lower cover has a concave-convex structure, so as to fasten with the ring terminal 128 of the wire, or the connection terminal 122a and the ring terminal 128. ) By fastening all to have an uneven structure, there is an advantage that can improve the electrical coupling force.

In particular, since the ring terminal 128 has a donut-shaped plate structure, the concave-convex structure can be easily produced by bending.

As described in detail above, in order to increase the electrical coupling force of the lamps disposed in the direct type liquid crystal display, the screw loosening is made by the concave-convex structure having the elasticity of the connection terminal of the common electrode disposed inside the lower cover. Nevertheless, there is an effect that can improve the electrical reliability of the common electrode and the wire.

The present invention is not limited to the above-described embodiments, and various changes can be made by those skilled in the art without departing from the gist of the present invention as claimed in the following claims.

1 is a view schematically illustrating an assembly structure of a general liquid crystal display device.

2 is a diagram illustrating a lamp assembly structure of a liquid crystal display device according to the prior art.

3 is an enlarged view of the fastening state between the common electrode and the inverter wire in FIG. 2.

4 is a view showing a lamp assembly structure of the liquid crystal display device according to the present invention.

FIG. 5 is a diagram illustrating a structure of a common electrode and a ring terminal in FIG. 4. FIG.

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

119: lamp 119a: lamp terminal

120: lower cover 122: common electrode

122a: common electrode terminal 125: wire

128: ring terminal 130: screw

140: connection terminal

Claims (4)

A liquid crystal display device comprising a liquid crystal panel and a backlight assembly including a lamp, And a common electrode including a common electrode terminal to which the lamps are coupled and an uneven type connecting terminal, and a wire connected to the inverter while being fastened to the uneven type connecting terminal of the common electrode. The method of claim 1, And a concave-convex ring terminal at a wire edge coupled to the concave-convex connection terminal. The method according to claim 1 or 2, And a ring terminal fastened to the connection terminal and the wire of the common electrode by a screw having a plurality of threads formed therein. The method according to claim 1 or 2, And the power supplied from the inverter has a fastening structure applied to the common electrode through the wire, the ring terminal, and the connection terminal.