KR20060079520A - A flat display device with a case for covering circuit board - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat panel display device having improved assembly properties of components constituting a module. According to an aspect of the present invention, there is provided a flat panel display device, a display panel for displaying an image, a chassis on which the display panel is supported, and an electrical signal installed in the chassis and electrically connected to the display panel to provide an electrical signal for driving the display panel. And a case installed in the chassis while covering the circuit board and the circuit board to be applied, wherein the chassis is formed with a plurality of protrusions protruding from the chassis to be elastically deformed, and a printed circuit board of the circuit board. The case is provided with a hole corresponding to the protrusion is fitted to the protrusion.

Case, Projection, Printed Circuit Board, Cover, Flatbed

Description

Flat panel display device with case for circuit board cover {A FLAT DISPLAY DEVICE WITH A CASE FOR COVERING CIRCUIT BOARD}

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

2 is a perspective view illustrating a combined rear surface of the flat panel display device according to the exemplary embodiment.

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

4 is a partially exploded perspective view illustrating a process in which a printed circuit board and a cover case of a circuit board are coupled to a protrusion according to an embodiment of the present invention.

5 is a cross-sectional view illustrating a state in which a printed circuit board and a cover case of a circuit board are coupled to a protrusion according to an embodiment of the present invention.

The present invention relates to a flat panel display device, and more particularly, to a coupling structure of a circuit board and a case for protecting the circuit board 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 the light sources of the liquid crystal display panel and the backlight assembly are respectively installed on the module. In general, the circuit board includes a plurality of circuit elements mounted on a printed circuit board (PCB). The display panel and the backlight assembly are installed at the rear of the bottom chassis on which the display panel and the backlight assembly are mounted.

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

However, the conventional case is coupled to the bottom chassis through the screw as described above, not only spends some time to combine it but also inconvenient in its workability in configuring a module It is reducing manufacturing productivity.

Moreover, in the related art, the printed circuit board of the above-described circuit board is also coupled to the bottom chassis by a screw coupling method, which adds to the above problem.

The present invention is to solve the above-described problems, to provide a flat panel display device that can improve manufacturing productivity by improving the coupling structure of the circuit board and the case for protecting the circuit board.

According to an aspect of the present invention, there is provided a flat panel display device including a display panel for displaying an image, a chassis on which the display panel is supported, and a display panel installed on the chassis and electrically connected to the display panel. And a case installed in the chassis while covering the circuit board and a circuit board for applying an electrical signal required to drive a furnace, wherein the chassis is formed with a plurality of protrusions protruding from the chassis to be elastically deformed. The printed circuit board and the case of the circuit board are formed with holes to be fitted to the projections corresponding to the projections.

The hole may be formed in a corner portion of the printed circuit board and the case.

The protrusion includes a vertical portion protruding from the chassis, and a body having a portion elastically movable with a space therebetween while being connected to one side of the vertical portion.                     

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

The display panel may be formed of a liquid crystal display panel. In this case, the flat panel display may further include a backlight assembly for supplying light to the liquid crystal display panel, and the chassis may be a bottom chassis included in the backlight assembly. .

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 5. These embodiments of the present invention are merely for illustrating the present invention, but the present invention is not limited thereto.

FIG. 1 is an exploded perspective view of a flat panel display device 100 according to an embodiment of the present invention, and FIG. 2 is a rear perspective view illustrating a state in which the flat panel display device 100 of FIG. 1 is coupled. ) Shows a direct type flat panel display arranged side by side toward the liquid crystal display panel 50, which is a display panel. 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. Therefore, 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. .

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 It consists of liquid crystals (not shown) injected between these 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.

Inputting electrical signals from the printed circuit boards (PCBs, hereinafter referred to as PCBs) 41 and 42, respectively, to the data lines and the gate lines of the liquid crystal display panel 50 described above, the source terminals and gates of the TFTs. 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 R, G, and B pixels, which are color pixels in which a predetermined color is expressed while light passes, are coated with a common electrode made of ITO 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 a driving signal to the data line is connected to the flexible printed circuit board 48 to receive the driving signal from the driving circuit board 80 and attached to the liquid crystal display panel 50. The driving signal is transmitted to the liquid crystal display panel 50 by being connected to the data COF 44.

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 provided with a plurality of parts including a light source 76 therebetween in a state where the mold frame 71 and the bottom chassis 75 are disposed to have a vertical position. It is composed. The mold frame 71 and the bottom chassis 75 fix and support the liquid crystal display panel 50.

The backlight assembly 70 is accommodated adjacent to the bottom surface of the bottom chassis 75 and the plurality of light sources 76 arranged to be fixedly spaced apart by a predetermined distance on the bottom chassis 75 and exit from the light source 76. The reflective sheet 79 for reflecting light, the frame mold side 78 for holding and supporting the light source 76 at both ends of the light source 76, and the luminance characteristics of the light from the light source 76 are ensured. An optical sheet 72 and a diffusion plate 74 for providing light to the liquid crystal display panel 50 are included. 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 board 73 for generating an electrical signal for applying a driving voltage to the light source 76 and an upper side of the driving circuit 80 are provided on the bottom of the bottom chassis 75.

At this time, both circuit boards 73 and 80 are constructed 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 board 73, a 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 board 73. Also for the circuit board 80, a case (aka shield case) 82 for protecting the driving circuit board 80 is coupled to one side of the bottom chassis 75 while covering the driving circuit board 80. .

The case 82 for the driving circuit board 80 not only protects the driving circuit board 80 from the external environment, but also serves to shield electromagnetic interference generated from the driving circuit board 80. .

The case 82 is fixed on the bottom chassis 75 by protrusions 84 protruding from the bottom chassis 75 together with the PCB 80a of the driving circuit board 80. That is, the case 82 and the PCB 80a of the driving circuit board 80 are fitted to the protrusion 84.

To this end, the protrusion 84 has a structure that can be elastically deformed. For example, as shown in FIG. 3, the protrusion 84 is connected to one side of the vertical portion 84a which protrudes from the bottom chassis 75 in a vertical state and is perpendicular to the vertical portion 84a. It may be formed to include a body (84c) having a portion (84b) elastically movable with a space between the portion (84a).                     

Here, the portion 84b moves toward the vertical portion 84a when a constant force is applied to the body 84c or when the force is released from the body 84c. Can move in the outward direction.

In contrast, holes 80a and 82a are formed in the PCB 80a and the case 82 of the driving circuit board 80 to allow the protrusions 84 to be fitted. The holes 800a and 82a are formed in the PCB 80a of the driving circuit board 80 and the case 82, respectively, by maintaining the same position so as to fit together into one projection 84. The forming position may be a corner portion of the PCB 80a and the case 82 of the driving circuit board 80.

In the present embodiment, as the PCB 80a and the case 82 of the driving circuit board 80 are formed to have a substantially rectangular shape, the protrusion 84 has four of the bottom chassis 75. The holes 800a and 82a are formed at the rectangular corners of the PCB 80a and the case 82 of the driving circuit board 80, respectively.

The number of the protrusions 84, the holes 800a and 82a corresponding to the protrusions 84, and the positions thereof are not limited to the above-described cases, and can be appropriately changed.

Accordingly, when the driving circuit board 80 and the case 82 are installed on the bottom chassis 75 on which the protrusions 84 are formed, the bottom chassis 75 is previously shown in FIG. 4. When the protrusions 84 formed thereon are fitted to fit the holes 800a of the PCB 80a of the driving circuit board 80 and the holes 82a of the case 82, the PCB 80a is provided. And the case 82 can be easily mounted on the bottom chassis 75.

That is, when the holes 800a and 82a start to fit into the protrusions 84, the portions 84b of the protrusions 84 are pressed by the inner circumferential surfaces of the holes 800a and 82a to be elastic. When the holes 800a and 82a are completely fitted into the protrusions 84, the force applied to the portions 84b is released and the portions 84b are returned to their original positions. Since the upper surface of the case 82 is in contact with the bottom surface of the portion (84b), as a result, the PCB (80a) and the case (82) is locked by the projection (84) to the bottom chassis 75 It can be fixed. This action can be easily performed in one operation by the operator to fit the holes (800a, 80a) of the PCB (80a) and the case 82 to the projection (84).

As described above, the flat panel display device according to the present invention has a structure in which a circuit board and a case provided to protect the circuit board are installed on the bottom chassis in a fitting manner by protrusions and holes instead of a screw coupling method. As a result, the installation work on the circuit board and the case may be easily performed, thereby reducing the manufacturing time for the circuit board and the case, thereby improving product productivity.

In addition, it is possible to remove the screw for fastening parts, thereby reducing the number of parts can be a side effect of lowering the management convenience and manufacturing cost.

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 (6)

A display panel displaying an image; A chassis on which the display panel is supported; A circuit board installed in the chassis and electrically connected to the display panel to apply an electrical signal for driving to the display panel; And A case installed in the chassis while covering the circuit board Including, The chassis is formed with a plurality of protrusions protruding from the chassis and can be elastically deformed, And a hole in the printed circuit board and the case of the circuit board, the hole being fitted to the protrusion corresponding to the protrusion. In claim 1, And a hole formed at a corner of the printed circuit board and the case. In claim 1, And the protrusion includes a body having a vertical portion protruding from the chassis and a portion connected to one side of the vertical portion and having an elastically moving portion with a space therebetween. In claim 1, And the circuit board and the case are disposed on an outer surface of the chassis to face the display panel with the chassis interposed therebetween. In claim 1, And the display panel is a liquid crystal display panel. In claim 5, 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.

Images