KR20060015909A - A liquid crystal display provided with a transformed bottom chassis - Google Patents

Abstract

The present invention relates to a liquid crystal display device in which the bottom chassis is modified. To this end, the liquid crystal display according to the present invention includes a liquid crystal display panel for displaying an image, a backlight assembly for supplying light to the liquid crystal display panel, a bottom chassis accommodating the backlight assembly and having a recessed portion formed therein facing the liquid crystal display panel. And a printed circuit board accommodated in a housing of the bottom chassis. Through the present invention it is possible to shield the EMI generated in the printed circuit board to prevent malfunction of the internal components of the liquid crystal display device.

EMI, Shielded, Bottom Chassis, Storage

Description

Liquid crystal display with modified bottom chassis {A LIQUID CRYSTAL DISPLAY PROVIDED WITH A TRANSFORMED BOTTOM CHASSIS}

1 is an exploded perspective view of a liquid crystal display according to an exemplary embodiment of the present invention.

2 is a perspective view illustrating a liquid crystal display according to an exemplary embodiment of the present invention.

3 is a rear perspective view of the liquid crystal display according to the exemplary embodiment of the present invention.

4 is a partial cross-sectional view taken along line AA of FIG. 2.

The present invention relates to a liquid crystal display device in which a bottom chassis is modified, and more particularly, to a liquid crystal display device in which a structure thereof is modified to shield EMI generated from a printed circuit board.

With the recent rapid development of semiconductor technology, the demand for liquid crystal display devices having improved performance while being smaller and lighter is exploding.

Recently, liquid crystal displays (LCDs), which have been in the spotlight, have advantages such as miniaturization, light weight, and low power consumption, and as an alternative means to overcome the disadvantages of the conventional cathode ray tube (CRT). It has been 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.

In such a liquid crystal display device, a printed circuit board having a plurality of components mounted thereon is used to apply a driving signal to a liquid crystal display panel or to apply driving power to a lamp used as a backlight. Since electromagnetic waves are emitted when the driving power is applied to the printed circuit board, it is necessary to shield the electromagnetic interference (EMI). EMI not only interferes with the normal operation of the components inside the liquid crystal display but also is harmful to humans. Therefore, various methods have been attempted to shield EMI generated from a printed circuit board.

As one of such methods, a method of attaching an EMI gasket together with a shield case to a printed circuit board used in a liquid crystal display is performed. However, in such a method, the number of components coupled to the liquid crystal display device increases, which not only makes the manufacturing process complicated but also inadequate use of the shield case, which causes the printed circuit board to be broken or exposed to the outside, thus preventing effective EMI shielding. There was a problem.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a liquid crystal display device having a structure capable of fundamentally shielding EMI.

According to an aspect of the present invention, there is provided a liquid crystal display device including a liquid crystal display panel for displaying an image, a backlight assembly for supplying light to the liquid crystal display panel, a backlight assembly, and facing the liquid crystal display panel. A concave receiving portion includes a bottom chassis formed in a portion thereof, and a printed circuit board (PCB) accommodated in the receiving portion of the bottom chassis.

The printed circuit board may be connected to the liquid crystal panel along the outer surface of the bottom chassis to apply a driving signal to the liquid crystal panel.

The housing of the bottom chassis is preferably opened to the side where the liquid crystal display panel and the printed circuit board are connected.

The printed circuit board may be fixed to the housing of the bottom chassis.

In addition, the guide members may be provided on both side surfaces of the bottom chassis, and the guide members may be guided by the guide members to slide the printed circuit board.

A pair of guide members spaced apart from each other in parallel to each other in the housing portion of the bottom chassis can be provided, and the printed circuit board can be slidably fixed between the pair of guide members.                     

The backlight assembly may include a reflective sheet installed on the bottom surface of the bottom chassis, and the reflective sheet may be spaced apart from the printed circuit board.

Moreover, it is preferable that the accommodating part of a bottom chassis is formed by press working.

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 liquid crystal display device 100 according to an exemplary embodiment of the present invention, and shows a liquid crystal display device 100 having a structure for shielding EMI. The direct type liquid crystal display shown in FIG. 1 is merely for illustrating the present invention, and the present invention is not limited thereto. Therefore, the present invention can also be applied to an edge type or wedge type liquid crystal display device.

The liquid crystal display device 100 according to the exemplary embodiment of the present invention illustrated in FIG. 1 includes a backlight assembly 70 that supplies light and a liquid crystal display panel assembly 40 that displays an image corresponding to the light. . In addition, the top chassis 60, the upper mold frame 62, and the bottom chassis 10 are combined to fix and support them.

The backlight assembly 70 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 70 has a flat panel display on which an image is displayed. The liquid crystal display panel 50, which is a channel, is controlled.                     

The liquid crystal display panel assembly 40 includes a liquid crystal display panel 50, a tape carrier package (TCP) 41, 43, and a printed circuit board (PCB) 45, 47. The liquid crystal display panel 50 includes a TFT substrate 51 composed of a plurality of TFTs (thin film transistors), a color filter substrate 53 positioned on the TFT substrate 51, and a liquid crystal (injected therebetween). Not shown). A polarizer (not shown) is attached to the upper portion of the color filter substrate 53 and the lower portion of the TFT substrate 51 to linearly polarize visible light passing through the backlight assembly 70.

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) as a conductive material is formed.

When electrical signals are input from the printed circuit boards 45 and 47 to the data lines and the gate lines of the liquid crystal display panel 50 described above, electrical signals are input to the source and gate terminals of the TFT, Depending on the input, 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, 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 of the liquid crystal display panel 50 and the timing at which 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. The data driving signal is applied to the source side of the liquid crystal display panel 50. A data TCP 41 for determining the application timing of the data is attached, and a gate TCP 43 is attached to the gate side for determining the application timing of the gate driving signal.

The gate PCB 47 and the data PCB 45 for receiving a video signal from the outside of the liquid crystal display panel 50 and applying a driving signal to the data line and the gate line, respectively, are provided on the gate line side of the liquid crystal display panel 50. Connection is made with the gate TCP 43 and the data TCP 41 on the data line side, respectively.

The data PCB 45 and the gate PCB 47 generate data signals, gate driving signals, which are signals for driving the liquid crystal display device 100, and a plurality of driving 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 50 through the gate TCP 43, and the data signal is applied to the data line of the liquid crystal display panel 50 through the data TCP 41.

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

The backlight assembly 70 is accommodated and fixed on the bottom chassis 10. The backlight 71 is a plurality of backlights 71 and a lower portion of the lamp 71 that are arranged to be fixedly spaced apart by a predetermined distance on the bottom chassis 10. A reflecting sheet 74 positioned at and reflecting light emitted from the lamp 71, a lamp holder 72 holding and fixing the lamp 71 at both ends of the lamp 71, and the brightness of the light from the lamp 71. An optical sheet 76 and a diffusion plate 78 are provided to secure light and provide light to the liquid crystal display panel assembly 40. In particular, although the lamp 71 is used as the light source in the liquid crystal display 100 of FIG. 1, a light emitting diode (LED) may be used instead. In addition, a line light source or a surface light source made of other materials may be used as the light source.

An inverter board (not shown) and a signal conversion PCB (not shown), which are power supply PCBs, are installed on the bottom of the bottom chassis 10. The inverter board transforms an external power supply to a constant voltage level to provide the lamp 71, and the signal conversion PCB is connected to the aforementioned data PCB 45 and the gate PCB 47 to convert analog data signals into digital data signals. To the liquid crystal display panel 50.

In order to prevent the liquid crystal display panel assembly 40 from being separated from the bottom chassis 10 while bending the data PCB 41 and the gate PCB 43 to the outside of the mold frame 62 on the liquid crystal display panel assembly 40. A top chassis 60 is provided. 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.

FIG. 2 is a perspective view illustrating a liquid crystal display device 100 according to an embodiment of the present invention, in which components of the liquid crystal display device 100 shown in FIG. 1 are combined.

As shown in FIG. 2, in the exemplary embodiment of the present invention, the top chassis 60 supports the liquid crystal display panel 50 while surrounding the edges of the liquid crystal display market value 100, thereby preventing the liquid crystal display device 100 from external impact. It protects the internal parts of).

FIG. 3 is a rear perspective view of the liquid crystal display according to the exemplary embodiment, in which the liquid crystal display shown in FIG. 2 is rotated by 180 ° with respect to the Y axis, and then viewed from the right.

As shown in FIG. 3, in the liquid crystal display according to the exemplary embodiment, an accommodating part 101 is formed in a part of the bottom chassis 10 to accommodate the data PCB 45. In FIG. 3, the data PCB 45 is illustrated as being housed in an accommodating portion 101 formed in a portion of the bottom chassis 10. However, this is merely to illustrate the present invention and the present invention is not limited thereto. Accordingly, other PCBs may be stored in the housing 101. In addition, the inverter board for supplying power to the light source is located on the bottom of the bottom chassis 10, but the illustration is omitted for convenience.

Here, the data PCB 45 is connected to the liquid crystal display panel along the outer surface (Y-axis direction) of the bottom chassis 10 to apply a driving signal. For this purpose, the data PCB 45 is connected to the data TCP 41. A connector 105 is mounted on the data PCB 45 to be firmly connected to the data TCP 41. In this way, the housing 101 of the bottom chassis 10 is opened to the side where the liquid crystal display panel and the data PCB 45 are connected so that the liquid crystal display panel and the data PCB 45 can be connected well. This makes it easy to attach and detach the data PCB 45 to the outer side of the accommodating portion 101.

In the lower portion of the data PCB 45, a reflective sheet 74 provided on the bottom surface of the bottom chassis 10 is located. Since the reflective sheet 74 has a constant thickness to maintain durability, it is hardly likely to be torn by the contact of the data PCB 45, but in order to prevent the reflective sheet 74 from being torn, the reflective sheet 74 ) And the data PCB 45 are spaced apart from each other. This is possible by fixing the data PCB 45 to the housing 101 as follows. Such a method of fixing the data PCB 45 is merely to illustrate the present invention, but the present invention is not limited thereto. Therefore, the data PCB 45 may be fixed to the housing 101 in another manner.

As shown in FIG. 3, the guide members 103 may be provided on both sides of the housing 101 of the bottom chassis 10, and guided by the guide members 103 to slidably fix the data PCB 45. . According to such a coupling method, not only the data PCB 45 may be easily accommodated in the accommodating part 101, but the data PCB 45 may be firmly fixed to the accommodating part 101, thereby causing damage to the data PCB 45. Various side effects can be obtained.

The guide member 103 may be spaced apart from each other in parallel with each other on both sides of the accommodating part 101 to install a pair, and the data PCB 45 may be slidably fixed between the pair of guide members 103. The EMI shielding process generated in the data PCB 45 accommodated in the accommodating portion 101 in this manner will be described in detail with reference to FIG. 4.

4 is a cross-sectional view taken along line AA of FIG. 2 and illustrates an internal structure of the liquid crystal display device.

As shown in FIG. 4, a part of the bottom chassis 10 is formed with a recessed accommodating portion 101 facing the liquid crystal display panel 50 to accommodate the data PCB 45. The housing 101 formed in a part of the bottom chassis 10 may be formed by pressing. That is, the housing 101 may be formed by applying more pressure to a specific portion of the bottom chassis 10 through press working.

As shown in FIG. 4, since the data PCB 45 is accommodated in the housing 101, the EMI 101 generated and emitted from the data PCB 45 may be blocked by the housing 101 as indicated by the arrow. . In addition to the opening formed in order to connect with the liquid crystal display panel 50, the accommodating portion 101 may be formed with another small opening to connect with other components such as a signal conversion PCB, and the opening may be shielded with other members. In this way, the data PCB 45 may be mounted on the housing 101 of the bottom chassis 10, so that the EMI generated by the data PCB 45 may be effectively shielded to smoothly operate the liquid crystal display. Can be.

As described above, the liquid crystal display device according to the present invention forms a recessed portion in a part of the bottom chassis facing the liquid crystal display panel and accommodates the printed circuit board to shield the EMI generated from the printed circuit board. Not only can the characteristics be improved, but the number of parts used in the manufacture of the liquid crystal display device, such as the shield plate disappears, can be reduced.

In addition, since the printed circuit board is connected to the liquid crystal display panel along the outer surface of the bottom chassis to apply a driving signal to the liquid crystal display panel, the printed circuit board is connected to the printed circuit board through the outside of the bottom chassis. The connection structure can be simplified.

Since the accommodating part of the bottom chassis is opened to the side where the liquid crystal display panel and the printed circuit board are connected, there is an advantage of easily inserting the printed circuit board through the opening.

Since the printed circuit board is fixed to the accommodating part of the bottom chassis, the printed circuit board can be firmly fixed, thereby preventing damage to the printed circuit board from external impact.

In addition, since the printed circuit board is slid and fixed by guiding with guide members installed on both sides of the bottom part of the bottom chassis, the printed circuit board is firmly fixed and easily detachable, thereby making it easy to work.

Since the reflective sheet is spaced apart from the printed circuit board, there is no risk of tearing the reflective sheet by the printed circuit board.

Since the housing of the bottom chassis is formed by pressing, the housing of the bottom chassis can be formed through a simple manufacturing process.

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)

Liquid crystal display panel for displaying an image, A backlight assembly supplying light to the liquid crystal display panel; A bottom chassis accommodating the backlight assembly and having a concave accommodating portion formed in a portion thereof to face the liquid crystal display panel; Printed circuit board (PCB) accommodated in the receiving portion of the bottom chassis Liquid crystal display comprising a. In claim 1, The printed circuit board is connected to the liquid crystal display panel along the outer surface of the bottom chassis to apply a driving signal to the liquid crystal display panel. In claim 2, And a housing part of the bottom chassis, which is open toward the side where the liquid crystal display panel and the printed circuit board are connected. In claim 1, The printed circuit board is fixed to the receiving portion of the bottom chassis. In claim 4, And a guide member on both side surfaces of the bottom chassis, the guide member being guided by the guide member to secure the printed circuit board. In claim 4, And a pair of guide members spaced apart from each other in parallel to each other in the housing of the bottom chassis, and sliding the fixed printed circuit board between the pair of guide members. In claim 1, The backlight assembly may include a reflective sheet disposed on a bottom surface of the bottom chassis, and the reflective sheet may be spaced apart from the printed circuit board. In claim 1, And a housing part of the bottom chassis formed by pressing.

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