KR20060017105A - A flat display device provided with an improved structure for fixing a printed circuit board - Google Patents

Abstract

The present invention relates to a flat panel display device having an improved fixed structure of a printed circuit board. To this end, the flat panel display device of the present invention, a flat panel display panel for displaying an image, a backlight assembly for supplying light to the flat panel display panel to guide the light to improve the brightness, a bottom assembly housing the backlight assembly and a guide holder formed on the back And a printed circuit board positioned at the rear of the bottom chassis and fixed to the side by a guide holder. Through the present invention, the printed circuit board can be easily fixed.

Printed circuit board, guide part, fixing part, resin

Description

Flat display device with improved fixed structure of printed circuit board {A FLAT DISPLAY DEVICE PROVIDED WITH AN IMPROVED STRUCTURE FOR FIXING A PRINTED CIRCUIT BOARD}

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

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

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

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

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

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat panel display device having an improved structure for fixing a printed circuit board. More particularly, the present invention relates to a flat panel display device having an improved fixing method when a printed circuit board is fixed to a bottom chassis.

With the recent development of semiconductor technology, which is rapidly developing in recent years, the demand for flat panel display devices that are smaller and lighter and has improved performance is exploding.

The liquid crystal display (LCD), which has recently been in the spotlight among the flat panel display devices, has advantages such as miniaturization, light weight, and low power consumption, thereby overcoming the disadvantages of the conventional cathode ray tube (CRT). As an alternative means, it has been gradually attracting attention, and is currently used in almost all information processing equipment that requires a display device.

A general liquid crystal display device applies voltage to a specific molecular array of a liquid crystal to convert it into another molecular array, and visually changes optical properties such as birefringence, photoreactivity, dichroism, and light scattering characteristics of the liquid crystal cell emitted by the molecular array. It is a light-receiving display device which converts into a change and displays information using the modulation of the light by a liquid crystal cell.

Since the liquid crystal display panel in the liquid crystal display device does not emit light by itself, the liquid crystal display panel includes a backlight assembly for providing light to the liquid crystal display panel under the liquid crystal display panel. The backlight assembly includes a lamp, a light guide plate, a reflective sheet, optical sheets, and the like.

The lamp electrodes of the backlight assembly are connected to the inverter board by lamp wires. The lamp receives the converted voltage from the inverter board. Inverter board is typically formed by fixing the convex portion on the back of the liquid crystal display device, and then cover the shield case and then screwed to secure. However, since the inverter board is moved due to the stress acting on the lamp wire, the fixing is difficult, so that the tack time is long and the screw is not fastened.

 SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and to provide a flat panel display device having a structure that can more firmly and easily fix a printed circuit board.

According to an aspect of the present invention, there is provided a flat panel display apparatus including a backlight assembly for displaying an image, a backlight assembly for supplying light to the flat panel display panel, and guiding the light to improve brightness. The bottom chassis includes a bottom chassis having a guide holder formed on a rear surface thereof, and a printed circuit board (PCB) positioned at a rear surface of the bottom chassis and fixed to a side thereof by a guide holder.

Here, the guide holder may include a guide portion adjacent to the side of the printed circuit board, and a fixing portion bent from the guide portion and adjacent to the front surface of the printed circuit board.

The surface of the guide holder adjacent to the printed circuit board is preferably coated with resin.

In addition, the guide holder may fix both sides of the printed circuit board.

The guide holder may fix one side of the printed circuit board connected to both sides of the printed circuit board.

The printed circuit board may be connected to the flat panel display panel.

The flat panel display panel may be a liquid crystal display panel.

The backlight assembly may include a lamp for supplying light, and the printed circuit board may be an inverter board connected to the lamp and supplying power.                     

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.

1 is an exploded perspective view of a flat panel display device according to a first embodiment of the present invention. The liquid crystal display device 100 shown in FIG. 1 is merely for illustrating the flat panel display device according to the present invention, but the present invention is not limited thereto. Therefore, the present invention can be applied to all flat panel display devices having a printed circuit board, for example, other flat panel display devices such as plasma display devices (PDPs) and organic light emitting diodes (OLEDs).

The liquid crystal display device 100, which is a flat panel display device according to the first embodiment of the present invention shown in FIG. 1, is largely a backlight assembly 50 for supplying light and a liquid crystal display panel for displaying an image corresponding to the light. Assembly 40. In addition, a top chassis 60, a mold frame 62, and a bottom chassis 10 are combined to fix and support them.

The backlight assembly 50 supplies light to the liquid crystal display panel assembly 40 and guides the light to improve brightness, and the liquid crystal display panel assembly 40 positioned on the backlight assembly 50 has a flat panel display on which an image is displayed. The liquid crystal display panel 70, which is a channel, is controlled.

The liquid crystal display panel assembly 40 includes a liquid crystal display panel 70, a tape carrier package (TCP) 41, 43, and a PCB 42, 44. Here, the liquid crystal display panel 70 is injected between a TFT substrate 71 composed of a plurality of TFTs (thin film transistors), a color filter substrate 73 positioned on the TFT substrate 71, and the substrates. It is made of liquid crystal (not shown).

The TFT substrate 71 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) as a conductive material is formed.

When electrical signals are input from the PCBs 42 and 44 to the data lines and the gate lines of the liquid crystal display panel 70 described above, electrical signals are inputted to the source and gate terminals of the TFT, and the electrical signals are input to the input signals. Accordingly, the TFT is turned on or turned off so that an electrical signal necessary for pixel formation is output to the drain terminal.

On the other hand, a color filter substrate 73 is disposed on the TFT substrate 71 thereon. The color filter substrate 73 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 71 and the color filter substrate 73 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 crystal of the liquid crystal display panel 70 and the timing when the liquid crystals are arranged, a driving signal and a timing signal are applied to the gate line and the data line of the TFT. A data TCP 43 for determining the timing of applying the signal is attached, and a gate TCP 41 is attached to the gate side for determining the timing of applying the gate driving signal.

The gate PCB 42 and the data PCB 44 for receiving image signals from the outside of the liquid crystal display panel 70 and applying driving signals to the data line and the gate line, respectively, are provided on the gate line side of the liquid crystal display panel 70. Connection is made with the gate TCP 41 and the data TCP 43 on the data line side, respectively.

The data PCB 44 and the gate PCB 42 generate data signals, gate driving signals, which are signals for driving the liquid crystal display device 100, and a plurality of timing signals for applying these signals at appropriate times, respectively. The gate driving signal is applied to the gate line of the liquid crystal display panel 70 through the gate TCP 41, and the data signal is applied to the data line of the liquid crystal display panel 70 through the data TCP 43.

The backlight assembly 50 is provided under the liquid crystal display panel assembly 40 to provide uniform light to the liquid crystal display panel assembly 40.

The backlight assembly 50 is received and fixed on the bottom chassis 10. A plurality of lamps 52 are fixedly installed on the bottom chassis 10, and both ends of the lamps 52 are supported by the lamp holder 58. do. A reflective sheet 59 is provided on the bottom surface of the bottom chassis 10 to reflect the light emitted from the lamp 52 to the liquid crystal display panel 70. The light emitted from the lamp 52 is uniformly spread while passing through the diffuser plate 54, and then the luminance is improved while passing through the plurality of optical sheets 56 and supplied to the liquid crystal display panel 70.

In the liquid crystal display device 100 according to the first exemplary embodiment of the present invention illustrated in FIG. 1, the top chassis 60 and the mold frame 62 may be fixed to support the liquid crystal display panel assembly 40 and the backlight assembly 50. , And a bottom chassis 10. The mold frame 62 secures the data PCB 44 and the gate PCB 42 that are bent to the outer side of the mold frame 62. On the liquid crystal display panel assembly 40, the data PCB 44 and the gate PCB 42 are bent out of the mold frame 62 to prevent the liquid crystal display panel assembly 40 from being separated from the bottom chassis 10. A top chassis 60 is provided.

An inverter board 80 (shown in FIG. 2), which is a power supply PCB, and a signal conversion PCB (not shown) are installed on the rear surface of the bottom chassis 10. The inverter board transforms an external power supply to a constant voltage level to supply power to the lamp 52, and the signal conversion PCB is connected to the aforementioned data PCB 44 and the gate PCB 42 to convert analog data signals into digital data signals. The conversion is provided to the liquid crystal display panel 70. The inverter board and signal conversion PCB are covered and protected by a shield case (not shown).

Although not shown in FIG. 1, a front case and a rear case are positioned at an upper portion of the top chassis 60 and a lower portion of the bottom chassis 10, respectively, to form a liquid crystal display device 100 by combining them. Hereinafter, the back structure of the liquid crystal display will be described in more detail with reference to FIG. 2.

FIG. 2 is a rear perspective view of a flat panel display device according to a first embodiment of the present invention, and after the liquid crystal display device 100 shown in FIG. 1 is assembled, rotated by 180 ° with respect to the X axis. In the first embodiment of the present invention, an inverter board which is one of the representative printed circuit boards is described as an example. Such an inverter board is only for illustrating the present invention, but the present invention is not limited thereto. Therefore, the present invention can be applied to other printed circuit boards.

As shown in FIG. 2, the bottom chassis 10 is connected to a data PCB 44 and a lamp 52 (shown in FIG. 1) that are bent out of the mold frame 62 (shown in FIG. Inverter board 80 for supplying is located. In FIG. 2, a lamp wire connecting the inverter board 80 and the lamp 52 is omitted for convenience. A plurality of components including an inverter are mounted on the inverter board 80. In particular, a plurality of connectors 81 are mounted to engage with sockets mounted at ends of lamp wires (not shown) connected to the electrodes of the lamp. .

The guide holder 110 is formed on the bottom of the bottom chassis 10. The guide holder 110 may be formed by press working or die casting the bottom chassis 10. A guide holder 110 is formed on the bottom of the bottom chassis 10 to fix the side surface of the inverter board 80, which is a printed circuit board.

The inverter board 80 may be fixed by sliding in the direction of the X axis, which is an arrow direction. The inverter board 80 is inserted below the guide holder 110, and then slides in the direction of the arrow to be coupled to the bottom of the bottom chassis 10. The guide holder 110 fixes the side surface of the inverter board 80 on the rear surface of the bottom chassis 10. In particular, in the first exemplary embodiment of the present invention, both side surfaces of the inverter board 80 may be fixed to increase work efficiency. The embossed protrusions 83 formed on the inverter board 80 are fixed to the protrusions formed on the bottom of the bottom chassis 10, so that the inverter board 80 does not easily detach from the bottom of the bottom chassis 10. .

As shown in the enlarged circle of FIG. 2, the guide holder 110 includes a guide portion 101 and a fixing portion 103 bent from the guide portion 101. The guide part 101 is adjacent to the side of the inverter board 80, and the fixing part 103 is adjacent to the front surface of the inverter board 80. Here, the inverter board 80 is a printed circuit board, and includes a plurality of wirings 801 and a resin layer 803 surrounding them.

As such, the side surface of the inverter board 80 is adjacent to the guide portion 101 of the guide holder 100, and the front surface of the inverter board 80 is adjacent to the fixing portion 103, so that the inverter board 80 is bottomed. Tightly fixed to the chassis 10 is not detached. Therefore, the workability may be improved by minimizing the fluidity of the inverter board 80 by the lamp wire connected to the inverter board 80. Accordingly, there is an advantage that the screw fastening operation in the subsequent process is easy or does not require a screw fastening at all.

3 is a rear perspective view of a flat panel display device according to a second exemplary embodiment of the present invention, in which the guide holder 210 is formed differently.

Since the second embodiment of the present invention is the same as the first embodiment of the present invention except for the guide holder 210, a detailed description thereof will be omitted, and the same reference numerals will be used to denote the same parts. In the second embodiment of the present invention, an inverter board which is one of the representative printed circuit boards is described as an example. Such an inverter board is only for illustrating the present invention, and the present invention is not limited thereto. Therefore, the present invention can be applied to other printed circuit boards.

Hereinafter, a second embodiment of the present invention will be described with the guide holder 210 as the main.

The guide holder 210 coats the surface adjacent to the inverter board 80 with a resin 105. That is, since the inner surface of the guide holder 210 is coated with a resin 105, when the inverter board 80 is slidingly coupled to the metal guide holder 210 in the direction indicated by the arrow in Fig. 3, the inverter board ( Damage to the surface of 80) can be minimized. That is, the inverter board 80 may have a wiring or the like formed on the surface thereof, and various electronic elements may be mounted to cause irregularities on the surface of the inverter board 80. Therefore, in order to prevent this, the inner surface of the guide holder 210 is coated with a resin.

As the resin 105, polyvinyl chloride or the like may be used, and the coating layer may be formed by a method of attaching a spray coating or a lamination tape.

4 is a rear perspective view of a flat panel display device according to a third embodiment of the present invention, showing a guide holder 310 for fixing the inverter board 80 at another position.

Since the third embodiment of the present invention is the same as the first embodiment of the present invention except for the installation position of the guide holder 310, the detailed description thereof is omitted, and the same reference numerals are used for the same parts. In the third embodiment of the present invention, an inverter board which is one of representative printed circuit boards is described as an example. Such an inverter board is only for illustrating the present invention, but the present invention is not limited thereto. Therefore, the present invention can be applied to other printed circuit boards.

As shown in FIG. 4, the guide holder 310 fixes not only both sides of the inverter board 80 but also one side of the inverter board 80 connected thereto. Accordingly, except for the assembly direction of the inverter board 80 as shown by the arrow, all sides of the inverter board 80 can be fixed by the guide holder 310, so that the inverter board 80 is firmly secured. There is this.

FIG. 5 is a rear perspective view of a flat panel display device according to a fourth embodiment of the present invention, and shows a guide holder 410 for fixing a data PCB 44 connected to the flat panel display panel.

Since the fourth embodiment of the present invention is the same as the first embodiment of the present invention except for the formation position of the guide holder 410 and its fixing object, detailed description thereof is omitted, and the same reference numerals are used for the same parts. It is shown. In the fourth embodiment of the present invention, the data PCB 44, which is one of the representative printed circuit boards, is described as an example. Here, the data PCB 44 is only for illustrating the present invention, but the present invention is not limited thereto. Therefore, the present invention can be applied to other printed circuit boards.

As shown in FIG. 5, both sides of the data PCB 44 are fixed to the guide holder 410. The data PCB 44 supported and bent on the side of the bottom chassis 10 is inserted into the guide holder 410 in the direction of the arrow to fix both sides. Accordingly, the data PCB 44 may be fixed to the rear surface of the bottom chassis 10 so that subsequent steps such as assembly of the shield case may be easily performed.

As described above, in the flat panel display device according to the present invention, the side of the printed circuit board is fixed by a guide holder formed on the bottom of the bottom chassis, thereby minimizing the fluidity of the printed circuit board by the wires connected to the printed circuit board. Can increase. Accordingly, there is an advantage that the screw fastening operation in the subsequent process is easy or does not require a screw fastening at all.

In addition, the guide holder includes a guide portion and a fixing portion adjacent to the printed circuit board, and thus the printed circuit board can be more firmly fixed.

In addition, since the surface of the guide holder adjacent to the printed circuit board is coated with resin, the printed circuit board can be coupled and fixed without damaging the surface of the printed circuit board when the printed circuit board is coupled to the guide holder.

Guide holders fix both sides of the printed circuit board, so that the printed circuit board can be easily removed even when the flat display device is standing up.

The guide holder may fix one side of the printed circuit board connected to both sides of the printed circuit board, thereby more firmly fixing the printed circuit board.

Since the present invention can also be applied to a printed circuit board connected to a flat panel display panel, the present invention can be used universally.

In particular, the present invention can be applied to a liquid crystal display device in which the flat panel display panel is a liquid crystal display panel, thereby improving productivity in manufacturing the liquid crystal display device.                     

In addition, by applying the present invention to the inverter board, the inverter board can be easily fixed to the bottom chassis.

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 (8)

Flat panel display panel for displaying images, A backlight assembly supplying light to the flat panel display panel and guiding the light to improve brightness; A bottom chassis accommodating the backlight assembly and having a guide holder formed on a rear surface thereof; Located on the bottom of the bottom chassis, the printed circuit board (PCB) is fixed to the side of the guide holder Flat display device comprising a. In claim 1, The guide holder, A guide unit adjacent to a side of the printed circuit board, and A fixed portion bent from the guide portion and adjacent to the front surface of the printed circuit board Flat display device comprising a. In claim 2, And a surface of the guide holder adjacent to the printed circuit board is coated with resin. In claim 2, And the guide holder secures both sides of the printed circuit board.  In claim 4, And the guide holder fixes one side of the printed circuit board connected to both sides of the printed circuit board. In claim 1, And the printed circuit board is connected to the flat panel display panel. In claim 6, And the flat panel display panel is a liquid crystal display panel. In claim 1, The backlight assembly includes a lamp for supplying light, and the printed circuit board is an inverter board connected to the lamp to supply power.

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