KR20060081590A - Flat panel display device having a circuit cover case - Google Patents

Abstract

The present invention relates to a flat panel display device having improved assembly property of a module configuration. According to an exemplary embodiment of the present invention, a flat panel display device includes a display panel displaying an image, a first circuit board electrically connected to the display panel, and configured to apply a signal required for driving to the display panel, and the first circuit board and the first circuit board. A second circuit board connected to each other; a connecting member electrically connecting the first circuit board and the second circuit board; a chassis accommodating the display panel; and a second circuit board; The corresponding area includes an open metal protective case.

Protective case, circuit part, flexible printed circuit board, cover, flat plate

Description

Flat panel display device having a circuit cover case {A FLAT DISPLAY DEVICE WITH A CASE FOR COVERING CIRCUIT UNIT}

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

2 is a rear perspective view of a flat panel display device according to an exemplary embodiment of the present invention.

3 is a perspective view showing a case according to an embodiment of the present invention.

4 is a perspective view showing a case according to another embodiment of the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat panel display, and more particularly, to a case for protecting a circuit unit or preventing electromagnetic interference generated from the circuit unit in a module of the flat panel display device.

BACKGROUND OF THE INVENTION In flat panel displays, the demand for liquid crystal displays (LCDs), which are smaller and lighter, and whose performance is improved, has been exploding, centering on semiconductor technology, which is rapidly developing in recent years.

This liquid crystal display has been attracting attention as an alternative means of overcoming the disadvantages of the conventional cathode ray tube (CRT) because of its advantages of miniaturization, light weight, and low power consumption. It is installed and used in all information processing equipment.

The general configuration of the liquid crystal display device is achieved by forming one module of a liquid crystal display panel and a backlight assembly for providing light required for driving to the liquid crystal display panel in consideration of the fact that the liquid crystal display device is a light receiving display device.

Circuit modules for driving light sources of the liquid crystal display panel and the backlight assembly are respectively installed on the module, and the circuit part is typically formed by mounting a plurality of circuit elements on a printed circuit board (PCB). It is installed at the rear of the bottom chassis where the panel and backlight assembly is seated.

As a result, the circuit part has a structure exposed to the outside of the module. Thus, a case in which the circuit part is protected from the external environment is conventionally installed on the bottom chassis. In this case, the case covers the circuit part and is screwed to the bottom chassis to protect the circuit part, and serves to block electromagnetic interference (EMI) generated in the circuit part.

However, the conventional case has a problem in that the circuit part has a structure covering all four sides, so that in one module, the assembly time is increased to decrease productivity.

That is, a flexible printed circuit board (FPCB) electrically connected to the liquid crystal display panel is electrically connected to the circuit unit for driving the liquid crystal display panel among the circuit units, which is a structural limitation of the conventional case. Due to this, the flexible printed circuit board cannot be installed in the bottom chassis by covering the circuit part before being connected to the circuit part, and the flexible printed circuit board cannot be installed in the bottom chassis until the flexible printed circuit board is connected to the circuit part. It is a situation that reduces the assembly to.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a flat panel display device capable of improving module assembly by improving a structure of a case for protecting a circuit unit.

According to an aspect of the present invention, there is provided a flat panel display device comprising: a display panel for displaying an image, a first circuit board electrically connected to the display panel, and configured to apply a signal for driving to the display panel; A second circuit board electrically connected to the first circuit board, a connecting member electrically connecting the first circuit board and the second circuit board, a chassis accommodating the display panel, and the second circuit board. The area corresponding to the connection member includes an open metal protective case.

The open area may be formed by at least one concave portion formed in the body of the protective case.

The open area may be formed by at least one hole formed in the body of the protective case.                     

The protective case may be installed on an outer surface of the chassis to face the display panel with the chassis interposed therebetween.

The protective case may be screwed to the chassis.

The display panel may be formed of a liquid crystal display panel, wherein the display panel further includes a backlight assembly for supplying light to the liquid crystal display panel, wherein the chassis is a bottom chassis included in the backlight assembly. .

The first circuit board may include a plurality of independent circuit boards, and the connection member is present in a number corresponding to the plurality of circuit boards.

The second circuit board may be located on the rear of the chassis, and the connection member may be made of a flexible printed circuit board.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 4. These embodiments of the present invention are merely for illustrating the present invention, but the present invention is not limited thereto.

1 is an exploded perspective view of a flat panel display device 100 according to an embodiment of the present invention, in which a plurality of light sources 76 are arranged directly side by side toward a liquid crystal display panel 50 which is a display panel. Indicates. Direct type flat panel displays are mainly used in large liquid crystal displays such as TVs.

Although the liquid crystal display panel 50 is shown as an example of the display panel in FIG. 1, this is merely to illustrate the present invention, and the present invention is not limited thereto. Therefore, the present invention can also be applied to a flat panel display having another display panel. In particular, although FIG. 1 shows a liquid crystal display device which is a light receiving type display having a backlight assembly 70, this is merely to illustrate the present invention, but the present invention is not limited thereto. Accordingly, the present invention can be applied to a flat panel display device having a self-luminous display panel such as an organic light emitting diode (OLED) that does not use a backlight assembly. In addition, the structure of the flat panel display device 100 shown in FIG. 1 is only for illustration of this invention, Comprising: This invention is not limited to this. Therefore, the present invention can be applied to flat panel display devices having other structures.

The flat panel display apparatus 100 includes a backlight assembly 70 that supplies light and a liquid crystal display panel 50 that receives the light and displays an image. In addition, the flat panel display 100 may include a top chassis 60 for holding and holding the liquid crystal display panel 50 on the backlight assembly 70, and may further include other necessary portions. . In the present embodiment, the top chassis 60 is provided as a split chassis divided into two diagonally.

The backlight assembly 70 supplies light to the liquid crystal display panel 50 and guides the light to improve brightness, and the liquid crystal display panel assembly 40 positioned on the backlight assembly 70 displays an image. Control 50.

The liquid crystal display panel assembly 40 is referred to as a chip on film (COF) hereinafter connected to the liquid crystal display panel 50 and the liquid crystal display panel 50 to drive the liquid crystal display panel 50. 43, 44, and printed circuit boards 41, 42, and the like. The liquid crystal display panel 50 includes a TFT substrate 51 including a plurality of thin film transistors (TFF, hereinafter referred to as TFTs), a color filter substrate 53 disposed on the TFT substrate 51, and these It consists of liquid crystals (not shown) injected between the substrates. Polarizing plates (not shown) are attached to the upper portion of the color filter substrate 53 and the lower portion of the TFT substrate 51 to polarize light.

The TFT substrate 51 is a transparent glass substrate on which a matrix thin film transistor is formed, a data line is connected to a source terminal, and a gate line is connected to a gate terminal. In the drain terminal, a pixel electrode made of transparent indium tin oxide (ITO) is formed as a conductive material.

When electrical signals are input from the printed circuit boards (PCBs, hereinafter referred to as PCBs) 41 and 42, respectively, to the gate line and the data line of the liquid crystal display panel 50 described above, the source terminal and the gate of the TFT are input. Electrical signals are input to the terminals, and the TFTs are turned on or off in accordance with the input of these electrical signals, and electrical signals necessary for pixel formation are output to the drain terminals.

On the other hand, the color filter substrate 53 is disposed thereon opposite the TFT substrate 51. The color filter substrate 53 is a substrate in which RGB pixels, which are color pixels in which a predetermined color is expressed while light passes, are formed by a thin film process, and a common electrode made of ITO is coated on the entire surface thereof. When power is applied to the gate terminal and the source terminal of the TFT and the thin film transistor is turned on, an electric field is formed between the pixel electrode and the common electrode of the color filter substrate. By this electric field, the arrangement angle of the liquid crystal injected between the TFT substrate 51 and the color filter substrate 53 is changed, and the light transmittance is changed according to the changed arrangement angle to obtain a desired pixel.

In order to control the alignment angle of the liquid crystals and the timing at which the liquid crystals are arranged in the liquid crystal display panel 50, a driving signal and a timing signal are applied to the gate line and the data line of the TFT, and the timing of applying the gate driving signal and the data driving signal is determined. COFs 43 and 44 are attached to determine this.

The gate PCB 41 for receiving a video signal from the outside of the liquid crystal display panel 50 and applying a driving signal to the gate line is connected to the gate COF 43 attached to the liquid crystal display panel 50. In addition, the data PCB 42 for applying the driving signal to the data line is electrically connected to the driving circuit unit 80 by the flexible printed circuit board 48 which is an electrical connection member, and receives the driving signal therefrom, and the liquid crystal. The driving signal is transmitted to the liquid crystal display panel 50 by connecting to the data COF 44 attached to the display panel 50. The gate PCB 41 and the data PCB 42 form a first circuit board which is a source side circuit board in this embodiment. In this case, the data PCB 42 may receive a lot of tension as the size of the flat panel display device 100 increases, so that the data PCB 42 may be formed in at least two divided shapes as shown in the drawing.

The backlight assembly 70 is provided below the liquid crystal display panel assembly 40 to provide light to the liquid crystal display panel assembly 40.

The backlight assembly 70 is disposed between the split middle chassis 71 and the bottom chassis 75 having a '??' shape so as to have an upper and lower position relationship, and the light source 76 therebetween. It is configured to provide a number of parts, including. The middle chassis 71 and the bottom chassis 75 fix and support the liquid crystal display panel 50, and the top chassis 60 is fixed to the bottom chassis 75 by screwing together with the middle chassis 71.

The backlight assembly 70 is housed adjacent to the bottom surface of the bottom chassis 75 and a plurality of light sources 76 arranged to be fixedly spaced apart at a predetermined distance on the bottom chassis 75 and exit from the light source 76. To secure the luminance characteristics of the light from the reflective sheet 79 for reflecting the light, the frame mold side 78 for holding the light source 76 fixedly at both ends of the light source 76, and the light source 76. And an optical sheet 72 and a diffusion plate 74 for providing light to the liquid crystal display panel 50. Although a lamp is shown as an example of a light source in FIG. 1, this is merely to illustrate the present invention, and the present invention is not limited thereto. Therefore, a light emitting diode (LED) may be used as the light source, or a light source having a linear light source or a surface light source may be used.

An inverter circuit portion 73 and a driving circuit portion 80 for generating an electrical signal for applying a driving voltage to the light source 76 are provided on the bottom of the bottom chassis 75. The driving circuit 80 is provided as a second circuit board in this embodiment, including a printed circuit board on which circuit elements are mounted, such as a timing controller.

At this time, both circuits 73 and 80 are configured by mounting circuit elements necessary for each printed circuit board, and are covered by respective cases 77 and 82. That is, for the inverter circuit portion 73, a protective case 77 having a plurality of heat dissipation holes 771 is coupled to one side of the bottom chassis 75 while covering the inverter circuit portion 73 (for example, screwed). Also for the driving circuit unit 80, a protective case (aka shield case) 82 for protecting the driving circuit unit 80 covers the driving circuit unit 80 while also being screwed to one side of the bottom chassis 75. Is installed.

Here, the protective case 82 for the driving circuit unit 80 is made of a metal material such as aluminum (Al) to protect the driving circuit unit 80 from the external environment, as well as to prevent electromagnetic interference generated from the driving circuit unit 80. It also serves as a shield.

The protective case 82 is formed in a box shape to cover the driving circuit unit 80 as a whole, and at least one open area 804 is formed on the body 802. Here, the open area 804 is a fastening part for electrically connecting the display panel 50 and the driving circuit part 80, that is, in the present embodiment, the flexible printed circuit board 48 is a protective case 82. To be exposed without being covered by it.

In this embodiment, the open area 804 is formed as a recess formed by cutting a part of the body 802 of the protective case 82 as shown in FIG. 3, but the open area 804 is necessarily limited to this shape. It is not formed.

As another example, as shown in FIG. 4, the open area 902 may also be formed as a hole formed in a portion of the body 900 of the protective case 90.

That is, in the present invention, the open area may be formed in any shape that may expose the fastening portion.

In the present embodiment, the open area 804 is formed in the body 802 while the flexible printed circuit board 48 is mounted on the driving circuit unit 80 with the number thereof as two. However, this is only one example and can be appropriately changed depending on the number of flexible printed circuit boards 48.

In addition, a screw hole 806 is formed on the body 802 to screw the protective case 82 to the bottom chassis 75.                     

Accordingly, when the flat panel display device 100 having the protective case 82 formed as described above is configured as one module, the assemblability thereof can be improved due to the structure of the protective case 82.

That is, when the flexible printed circuit board 48 is connected to the driving circuit unit 80 and the protective case 82 is installed in the bottom chassis 75, in the present invention, the protective case 82 is attached to the bottom chassis 75. ), And then the flexible printed circuit board to the connector 92 exposed to the open area 802, after mounting the screw coupling (of course, the driving circuit portion 80 is covered by the protective case 82). These are assembled in the order of binding (48).

This assembling order is possible by the structure of the open area 802 of the protective case 82, and accordingly, the process of installing the protective case 82 in the bottom chassis 75 must be a flexible printed circuit board as in the prior art. After 48 is connected to the drive circuit section 80, the operation cannot be performed.

That is, when the bottom chassis 75 is prepared, the flexible printed circuit board 48 can be easily connected to the driving circuit unit 80 in a later step even if the protective case 82 is installed in advance in the bottom chassis 75. Will be.

As described above, the flat panel display device according to the present invention changes the structure of the protective case to cover the circuit to protect the circuit portion, thereby reducing the assembly time for the components of the flat panel display device It is possible to increase the assembly and manufacturing productivity thereof.                     

Although the present invention has been described above, it will be readily understood by those skilled in the art that various modifications and variations are possible without departing from the spirit and scope of the claims set out below.

Claims (11)

A display panel displaying an image; A first circuit board electrically connected to the display panel to apply a signal for driving to the display panel; A second circuit board electrically connected to the first circuit board; A connection member electrically connecting the first circuit board and the second circuit board; A chassis accommodating the display panel; And A protective case made of a metal material accommodating the second circuit board, and an area corresponding to the connection member is opened Flat display device comprising a. In claim 1, And at least one recess formed in the open area of the protective case. In claim 1, And an open area formed by at least one hole formed in the body of the protective case. In claim 1, And a protective case disposed on an outer surface of the chassis to face the display panel with the chassis interposed therebetween. The method of claim 1 or 4, And a protective case screwed to the chassis. In claim 1, And the display panel is a liquid crystal display panel. In claim 6, And a backlight assembly for supplying light to the liquid crystal display panel, wherein the chassis is a bottom chassis included in the backlight assembly. In claim 1, And the first circuit board comprises a plurality of independent circuit boards. In claim 8, And the connection members are present in a number corresponding to the plurality of circuit boards. In claim 1, And the second circuit board is located at the rear of the chassis. In claim 1, And the connecting member is a flexible printed circuit board.

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