KR20080040273A - Liquid crystal display device - Google Patents

Abstract

An LCD(Liquid Crystal Display) is provided to form a fastening hole, corresponding to a protection protrusion formed in the rear of a lower cover, in a PCB and fasten the fastening hole with the protrusion, thereby minimizing light leakage of a backlight assembly to the outside through a cut area of the lower cover rear. An LC panel displays images. A backlight assembly provides light to the LC panel. A lower cover(207) is disposed in the outside of the backlight assembly. In the rear of the lower cover, at least one protection protrusion(207a) is formed. A PCB(Printed Circuit Board)(208) is disposed in the rear of the lower cover. In the PCB, a fastening hole(208a) fastened with the protection protrusion of the lower cover is formed. When forming the protection protrusion, an opened space as a cut area(207b) is formed in the rear of the lower cover.

Description

Liquid crystal display {LIQUID CRYSTAL DISPLAY DEVICE}

1 is an exploded perspective view of a general liquid crystal display device.

2 is a perspective view illustrating a rear surface of a general liquid crystal display device.

3 is a perspective view showing region A of FIG. 2 in detail;

4 is an exploded perspective view illustrating a rear surface of a liquid crystal display according to a preferred embodiment of the present invention.

5 is an assembled perspective view illustrating a rear surface of the liquid crystal display according to the preferred embodiment of the present invention.

6 is a perspective view showing region C of FIG. 5 in detail;

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

207: lower cover

207a: protective protrusion

207b: incision area

208: Inverter PCB

208a: fastening hole

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display, and in particular, a fastening hole corresponding to a protective protrusion formed on a bottom cover is formed on a printed circuit board to be fastened so that the light of the backlight assembly is pulled out through the cutout area of the bottom cover. It relates to a liquid crystal display device that minimizes the exit.

BACKGROUND ART In general, liquid crystal display devices have tended to be gradually widened due to their light weight, thinness, and low power consumption. Accordingly, the liquid crystal display device is widely used as a portable computer such as a notebook PC, office automation equipment, audio / video equipment, indoor and outdoor advertising display devices, and the like.

Such a general liquid crystal display device includes a liquid crystal panel for displaying an image, a driving circuit unit for transmitting an image signal to the liquid crystal panel, a backlight assembly and a case for supplying light to the liquid crystal panel.

A general liquid crystal display device having the above configuration will be described with reference to FIGS. 1 to 3.

FIG. 1 is an exploded perspective view of a general liquid crystal display device. As shown in FIG. 1, a general liquid crystal display device includes a liquid crystal panel 100, a backlight assembly 103, a driving circuit unit 109, and an upper case surrounding and protecting these components. It comprises a case consisting of 106 and the lower cover 107.

FIG. 2 is a perspective view illustrating a rear surface of a general liquid crystal display device, in which an inverter printed circuit board 108 is attached to a rear cover 107 rear surface. Here, the inverter printed circuit board 108 is an inverter for supplying power to the lamp (refer to 104 in FIG. 1), hereinafter referred to as inverter PCB.

FIG. 3 is a perspective view showing region A of FIG. 2 in detail and is an enlarged view of a portion having a protective protrusion 107a.

The liquid crystal panel 100 includes a color filter substrate 101, which is an upper substrate, a thin film transistor array substrate 102, which is a lower substrate disposed opposite to the color filter substrate 101, and a liquid crystal filled between the substrates. It consists of layers (not shown).

In addition, the driving circuit 109 is generally mounted on a printed circuit board (PCB), and supplies a scan signal to the liquid crystal panel 100 and supplies image information to drive the liquid crystal panel 100.

 The backlight assembly 103 may include a lamp 104 that emits light, an optical sheet 105 that increases the efficiency of light emitted from the lamp 104, an inverter PCB 108 that supplies power to the lamp 104, and the like. It is configured to include. Here, the inverter PCB 108 converts the power supplied from the outside into a suitable voltage to the lamp and supplies it.

The case serves to protect the liquid crystal panel 100, the driving circuit unit 109, and the backlight assembly 103 from external impact, and also prevents the light emitted from the lamp 104 of the backlight assembly 103 from being lost. It increases the efficiency of light.

As shown in regions A and B of FIG. 2, at least one protective protrusion 107a is formed at the edge of the rear surface of the lower cover 107.

The protective projection 107a serves to protect the inverter PCB 108 during the assembling process of the liquid crystal display device.

In particular, in the assembling process of the liquid crystal display device, another assembly process or a transport operation is performed while the inverter PCB 108 is attached to the rear surface of the lower cover 107 and the member covering the inverter PCB 108 is not attached. When the lower cover 107 is placed on the ground, the inverter PCB 108 attached to the lower cover 107 also faces the ground, wherein the protection protrusion 107a is lower than the inverter PCB 108. First, the inverter PCB 108 serves to protect the devices mounted on the inverter PCB 108 by preventing the inverter PCB 108 from being placed on the ground.

Here, the ground refers to the workbench or the stage of the transportation equipment through which the process work is carried out.

The protective protrusion 107a, which serves as described above, is formed in a shape in which a cut portion is bent so as to protrude in an upper direction of the bottom of the lower backer 107 after cutting the edge of the bottom of the lower cover 107. At this time, due to the above operation, a perforated space, that is, an incision region 107b is formed on the rear surface of the lower cover 107.

The cutout region 107b is formed to be larger than the size of the protective protrusion 107a that is bent and folded after being cut.

However, this causes a problem of light leakage, in which light emitted from a lamp (see 104 in FIG. 1) leaks to the outside through the punctured space.

Recently, in order to solve such a problem, a light shielding tape is attached to a portion where the cutout region is formed, but a problem such as frequent detachment occurs due to a weak adhesive force of the light shielding tape.

Accordingly, the present invention has been made to solve the problems of the prior art, an object of the present invention is to change the shape of the lower cover and the printed circuit board, the light to the punctured space caused by forming a protective projection on the lower cover back surface An object of the present invention is to provide a liquid crystal display device which can minimize a loss of light emitted from a backlight assembly by blocking leakage to the outside.

According to a preferred embodiment of the present invention, a liquid crystal display device includes: a liquid crystal panel displaying an image; A backlight assembly supplying light to the liquid crystal panel; A lower cover disposed outside the backlight assembly and having at least one protective protrusion formed on a rear surface thereof; And a printed circuit board disposed on a rear surface of the lower cover and having a fastening hole to which the protective protrusion of the lower cover is fastened.

The printed circuit board is characterized in that the elements for driving the liquid crystal display device is mounted.

The printed circuit board is an inverter printed circuit board for driving a lamp.

The height of the protective protrusion is higher than the height from the bottom of the lower cover to the upper surface of the device mounted on the printed circuit board.

The area of the fastening hole is characterized in that at least the same as the area of the protective projection fastened to the fastening hole.

The protective protrusion is formed by cutting a portion of the rear surface of the lower cover so that the cutout portion protrudes to the upper portion of the lower cover rear surface.

The rear surface of the lower cover is characterized in that the incision region is formed by the formation of the protective projection.

The cutting region of the lower cover is characterized in that the protective projection is fastened to the fastening groove is blocked by the printed circuit board.

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

In describing the preferred embodiment of the present invention, other components except for the lower cover and the printed circuit board will be described with reference to FIG. 1.

4 is an exploded perspective view illustrating a rear surface of a liquid crystal display according to a preferred embodiment of the present invention.

5 is an assembled perspective view illustrating a rear surface of a liquid crystal display according to an exemplary embodiment of the present invention.

6 is a perspective view illustrating region C of FIG. 5 in detail.

1 and 4 to 6, a liquid crystal display according to a preferred embodiment of the present invention includes a liquid crystal panel (see 100 of FIG. 1) for displaying an image; A backlight assembly supplying light to the liquid crystal panel (see 103 in FIG. 1); A lower cover 207 disposed outside the backlight assembly and having at least one protective protrusion 207a formed on a rear surface thereof; And a printed circuit board 208 positioned on a rear surface of the lower cover 207 and having a fastening hole 208a fastened to the protective protrusion 207a.

The liquid crystal panel (see 100 in FIG. 1) includes a color filter substrate (see 101 in FIG. 1), which is an upper substrate, and a thin film transistor array substrate, which is a lower substrate disposed opposite thereto. 102) and a liquid crystal layer filled between these substrates.

The liquid crystal panel is driven by receiving scan signals and image information from a driver, and the driver includes a gate printed circuit board (see 110 in FIG. 1) and a data printed circuit board (see 111 in FIG. 1).

In particular, the data printed circuit board may be connected to the liquid crystal panel using a tape carrier package (TCP) and attached to the bottom of the lower cover 207.

This depends on the model of the liquid crystal display, but in the case of a small model, the data printed circuit board is often attached to the bottom cover.

Therefore, in describing the preferred embodiment of the present invention, the inverter PCB 208 attached to the bottom cover is described as an example. However, the present invention is not limited to the inverter PCB 208. It is also found that it can be sufficiently applied to a circuit board.

The backlight assembly (see 103 in FIG. 1) includes a lamp (see 104 in FIG. 1) that emits light, an optical sheet (see 105 in FIG. 1) that increases the efficiency of light emitted from the lamp, and an inverter PCB for supplying power to the lamp. 208 and the like.

In this case, the inverter PCB 208 serves to convert the power supplied from the outside into a suitable voltage to the lamp.

The lower cover 207 accommodates the backlight assembly (see 103 in FIG. 1), and at least one protective protrusion 207a is formed on a rear surface thereof.

The protective protrusion 207a is formed by cutting a portion of the rear surface of the lower cover 207 so that the cut portion protrudes toward the rear surface of the lower cover 207.

Due to the operation, a perforated space, that is, an incision region 207b is formed on the rear surface of the lower cover 207.

The protection protrusion 207a has a height higher than the height from the rear surface of the lower cover 207 to the upper surface of the element mounted on the inverter PCB 208, thereby effectively protecting the elements mounted on the inverter PCB 208. can do.

In particular, the protection protrusion 207a serves to protect the elements mounted in the inverter PCB 208 during the assembling process of the liquid crystal display device.

In the assembling process of the liquid crystal display device, the inverter PCB 208 is attached to the rear surface of the lower cover 207 and the other assembly process is performed or other process operations are performed while the member covering the inverter PCB 208 is not attached. When the transport to the space for the work is made, the back of the lower cover 207 is placed toward the ground and the inverter PCB 208 attached to the bottom of the lower cover 207 also faces the ground occurs. At this time, the elements mounted on the inverter PCB 208 is directed to the ground, wherein the protection protrusion 207a first touches the ground to prevent the elements mounted on the inverter PCB 208 from touching the ground to protect the elements. It will play a role.

Here, the ground refers to the workbench or the stage of the transportation equipment through which the process work is carried out.

4 and 5 illustrate that the two protective projections (207a) formed on the bottom of the lower cover 207, but the present invention is not limited thereto, the number of the protective projections (207a) can effectively achieve the present invention It is possible to change enough within the range.

The inverter PCB 208 is attached to the bottom of the lower cover 207 by a screw (not shown) or the like, and a fastening hole 208a corresponding to the protective protrusion 207a formed on the lower cover 207 is formed. . As shown in regions C and D of FIG. 5, the fastening hole 208a is fastened to the protection protrusion 207a during the liquid crystal display device assembly process.

5 and 6, the horizontal cross section of the fastening hole 208a formed in the inverter PCB 208 preferably coincides with the horizontal cross section of the protective protrusion 207a formed on the rear surface of the lower cover 207.

Here, the horizontal cross section refers to a cross section in a direction parallel to the rear surface of the lower cover 207.

As described above, the inverter PCB 208 having the fastening hole 208a having a horizontal cross section coinciding with the horizontal cross section of the protective protrusion 207a has a lower cover 207 by fastening the fastening hole 208a with the protective protrusion 207a. The cutout region 207b formed on the rear surface of the mask) is blocked.

Therefore, the phenomenon that light emitted from the backlight assembly (see 103 in FIG. 1) leaks to the outside through the cutout region 207b is essentially blocked.

Accordingly, there is an advantage of increasing the efficiency of the light emitted from the backlight assembly.

In addition, by blocking all of the cut-out area (207a) there is an effect of preventing the inflow of foreign matter into the lower cover 207 from the outside.

In addition, since the light shielding tape used to block the cutout region 207b does not need to be used, the material cost of the liquid crystal display can be reduced.

The fastening hole 208a is formed at an appropriate position in the inverter PCB 208, where no wiring is formed, and the position of the protective protrusion 207a is designed to correspond to the fastening hole 208a first. It is desirable to design it.

In the case where the space for forming the fastening hole 208a is avoided where the wiring is formed in the inverter PCB 208, when the wire is formed in the inverter PCB 208, the wiring is rearranged to form the fastening hole 208a. Make room for it.

As described above, according to the present invention, the inverter PCB 208 is connected to the protective protrusion 207a due to the fastening of the fastening hole 208a of the inverter PCB 208 and the protective protrusion 207a on the rear surface of the lower cover 207. Covering all the cut-off area 207b generated by the formation to prevent light leakage leaking to the outside light emitted from the lamp of the backlight assembly, there is an effect to prevent the inflow of foreign matter from the outside.

In addition, the fastening of the protection protrusion 207a on the bottom of the lower cover 207 and the fastening hole 208a of the inverter PCB 208 may be performed by placing the inverter PCB 208 on the bottom of the lower cover 207 in the liquid crystal display assembly process step. It serves to guide the inverter PCB 208 when fastening screws (not shown) to attach.

That is, the fastening of the protection protrusion 207a and the fastening hole 208a serves to prevent the flow of the inverter PCB 208 from the bottom of the lower cover 207 to fix the inverter PCB 208 to the bottom of the lower cover 207. In order to achieve the screw fastening operation can be efficient, thereby reducing the assembly process time.

In addition, the fastening of the protective protrusion 207a and the fastening hole 208a supports fixing in the X-axis and Y-axis directions shown in FIGS. 4 to 6 of the inverter PCB 208 placed on the bottom of the lower cover 207. In order to securely attach the inverter PCB 208 to the bottom of the lower cover 207, only fixing about the Z axis is required.

Therefore, the number of screws that are fastened to attach the inverter PCB 208 to the bottom of the lower cover 207 can be minimized.

In the description of the preferred embodiment of the present invention, the inverter PCB 208 attached to the bottom of the lower cover 207 is taken as an example, but the present invention is not limited to the inverter PCB 208, but other printed circuits such as data printed circuit boards. It is repeatedly revealed that it can be sufficiently applied to a substrate.

According to the liquid crystal display device according to the present invention as described above in detail, since the fastening holes corresponding to the protective projections formed on the rear cover bottom are formed in the inverter PCB to fasten them, an incision caused by forming the protective projections on the rear cover bottom The inverter PCB blocks all areas, minimizing the loss of light emitted from the backlight assembly, and also has the effect of introducing foreign substances from the outside.

In addition, the fastening of the protective protrusion and the fastening hole has an advantage of minimizing the number of screws for fixing the inverter PCB on the lower cover rear surface.

Claims (8)

A liquid crystal panel for displaying an image; A backlight assembly supplying light to the liquid crystal panel; A lower cover disposed outside the backlight assembly and having at least one protective protrusion formed on a rear surface thereof; And And a printed circuit board disposed on a rear surface of the lower cover, the printed circuit board having a fastening hole to which the protective protrusion of the lower cover is fastened. The liquid crystal display of claim 1, wherein elements for driving the liquid crystal display are mounted on the printed circuit board. The liquid crystal display of claim 2, wherein the printed circuit board is an inverter printed circuit board for driving a lamp. The liquid crystal display device according to claim 2, wherein the height of the protection protrusion is higher than the height from the bottom of the lower cover to the top of the element mounted on the printed circuit board. The liquid crystal display device according to claim 1, wherein an area of the fastening hole is at least equal to an area of a protective protrusion fastened to the fastening hole. The liquid crystal display of claim 1, wherein the protection protrusion is formed by cutting a portion of the rear surface of the lower cover so that the cutout portion protrudes above the rear surface of the lower cover. The liquid crystal display of claim 6, wherein an incision region is formed on a rear surface of the lower cover by forming the protective protrusion. The liquid crystal display of claim 7, wherein the cutout portion of the lower cover is blocked by the printed circuit board by being fastened to the fastening groove.

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