KR20080097778A

KR20080097778A - Lcd module

Info

Publication number: KR20080097778A
Application number: KR1020070043059A
Authority: KR
Inventors: 김동현
Original assignee: 엘지이노텍 주식회사
Priority date: 2007-05-03
Filing date: 2007-05-03
Publication date: 2008-11-06

Abstract

The present invention relates to an LCD (Liquid Crystal Display) module, LCD panel, BLU (Back Light Unit) for irradiating light using the LED from the back of the LCD panel, the LED is mounted, the ground pad is formed An LED FPCB, a conductive tape for attaching the LED FPCB to the BLU, a chassis formed of a metallic material on the outside of the BLU, adhered to the conductive tape, electrically connected to the LCD panel, and electrically connected to the LED FPCB. The present invention relates to an LCD module including an LCD FPCB connected thereto.

Description

LCD module {LCD module}

1 is a rear view of a conventional LCD module.

2 is a cross-sectional view of a conventional LCD module.

3 is a rear view of the LCD module according to an embodiment of the present invention.

4 is a cross-sectional view of the LCD module according to an embodiment of the present invention.

5 is a view showing an LED FPCB according to an embodiment of the present invention.

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

100 LCD Panel 200 Conductive Tape

300 LCD FPCB 400 LED FPCB

500 LED 600 Chassis

700 frames

The present invention relates to an LCD module.

In general, liquid crystal displays (hereinafter, referred to as "LCDs") have tended to be increasingly wider in application due to light weight, thinness, and low power consumption. According to this trend, LCDs are used for office automation devices, mobile devices, TVs, and the like.

In such LCD modules, there is a problem of malfunction and damage due to the inflow of electrostatic discharge (ESD). Accordingly, various attempts have been made to enhance resistance to ESD in the field of LCD modules.

1 is a rear view of a conventional LCD module.

As shown in FIG. 1, the rear surface of the conventional LCD module has a chassis 50 made of a metallic material to enhance the strength of the BLU in order to protect the LCD module from external impact on the outside of the BLU. It is provided. However, in the related art, since the chassis 50 is not electrically connected to the LCD FPCB 300 and is not grounded, there is a problem that the chassis 50 is vulnerable to ESD inflow into the LCD module through the chassis 50.

2 is a cross-sectional view of a conventional LCD module.

As shown in Figure 2, in the conventional LCD module, the adhesive tape 10 serves as a double-sided tape to attach the LED FPCB 400, the LED 50 is mounted to the BLU. On the other hand, conventionally, the adhesive tape 10 is composed of a non-conductive material that does not conduct electricity. Therefore, in the conventional LCD module, the chassis 50 and the LED FPCB 400 are not electrically connected, and the chassis 50 is not electrically grounded.

As described above, in the conventional LCD module, since the chassis 50 is not connected to the ground, the LCD module is vulnerable to ESD flowing into the LCD module. That is, when ESD is introduced into the LCD module, a so-called voltage reversal phenomenon occurs in which the voltage at the power supply terminal is lower than the voltage at the ground terminal, and thus a malfunction occurs in the LCD module. In addition, when the LCD module is mounted on a wireless terminal such as a mobile communication terminal, there is a problem that it adversely affects the wireless sensitivity of the wireless terminal.

SUMMARY OF THE INVENTION An object of the present invention is to provide an LCD module with enhanced ESD immunity and improved wireless sensitivity.

The present invention provides an LCD (Liquid Crystal Display) panel, a BLU (Back Light Unit) for irradiating light using LEDs from the back of the LCD panel, an LED FPCB on which the LED is mounted, and a ground pad is formed, and the LED FPCB. Conductive tape for attaching to the BLU, a chassis formed of a metallic material on the outside of the BLU, the chassis adhered to the conductive tape, and an LCD FPCB electrically connected to the LCD panel and electrically connected to the LED FPCB. It includes.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals have the same reference numerals as much as possible even if displayed on different drawings. In describing the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

3 is a rear view of the LCD module according to an embodiment of the present invention. 3 is a rear view of the LCD module without the backlight unit (hereinafter referred to as 'BLU').

The LCD (Liquid Crystal Display) panel 100 serves to display an image signal.

The conductive tape 200 serves to attach the LED FPCB to the BLU.

The LCD FPCB 300 is electrically connected to the LCD panel 100.

Now, the present invention will be described in more detail with reference to a cross-sectional view of the LCD module.

In FIG. 4, the BLU includes an optical sheet 30, a light guide plate 40, an LED 500, and a frame 700, and irradiates light to the LCD panel 100 using the LED 500. do.

LED 500 is mounted on the LED FPCB 400, and a ground pad for grounding is formed.

The conductive tape 200 is made of an electrically conductive material, and is used to attach the LED FPCB 400 to the BLU.

The chassis 600 is formed of a metallic material on the outside of the BLU, is bonded to the conductive tape 200, and serves to protect the LCD module from external shocks. As shown in FIG. 4, in the present invention, the chassis 600 is folded at 180 degrees. That is, as shown in Figure 4, the chassis 600 has a structure folded 180 degrees to surround the frame 700. Due to this structure, the chassis 600 is adhered to the conductive tape 200 and is electrically connected to the LED FPCB 400 through the conductive tape 200.

The LCD FPCB 300 is electrically connected to the LCD panel 100 and is electrically connected to the LED FPCB 400. In one embodiment of the present invention, the LCD FPCB 300 may include a ground pad for grounding, and the ground pad may be electrically connected to the ground pad of the LED FPCB 400.

5 shows an LED FPCB 400 according to an embodiment of the present invention.

As shown in FIG. 5, there is a region where the conductive tape 200 is attached to a region where the LED 500 of the LED FPCB 400 is mounted. The conductive tape 200 is attached at intervals so as not to contact the LED 500 and a PAD (not shown) portion for mounting the LED, and the conductive tape and the LED at the portion of the LED FPCB 400 to which the conductive tape 200 is attached. A ground terminal (not shown) is provided to electrically connect the FPCB. In addition, in FIG. 5, it can be seen that a ground pad GND for grounding is formed at a portion where the LCD FPCB 300 and the LED FPCB 400 are connected.

As described above, in the present invention, the chassis 600 is electrically connected to the LED FPCB 400 through the conductive tape 200. As a result, in the present invention, the chassis 600 is electrically connected to the LED FPCB 400 through the conductive tape 200 and the ground terminal (not shown) on the LED FPCB, and again, the ground pad GND of the LED FPCB 400. Is electrically connected to the ground. In addition, the LCD FPCB 300 is electrically connected to the ground pad GND of the LED FPCB 400 to be grounded. That is, in the present invention, the ground level of the LCD FPCB 300, the LED FPCB 400, and the chassis 600 is matched, whereby the ESD input through the chassis 600 passes through the ground pad of the LED FPCB 400. As it flows out to ground, the LCD module of the present invention, in turn, has increased resistance to ESD.

While the invention has been described using some preferred embodiments, these embodiments are illustrative and not restrictive. Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the invention and the scope of the rights set forth in the appended claims.

According to the present invention, the ground level of the LCD FPCB, the LED FPCB, and the chassis in the LCD module are matched, and thus, ESD resistance through the chassis flows out through the LED FPCB, thereby increasing resistance to ESD.

In addition, since the LCD FPCB, the LED FPCB, and the chassis are grounded when the LCD module is mounted in a wireless terminal such as a mobile communication terminal, the wireless sensitivity of the wireless terminal can be improved.

Claims

Liquid Crystal Display (LCD) panels;

BLU (Back Light Unit) for irradiating light using the LED from the back of the LCD panel;

An LED FPCB in which the LED is mounted and a ground pad is formed;

A conductive tape for attaching the LED FPCB to the BLU;

A chassis formed of a metallic material on the outside of the BLU and adhered to the conductive tape;

LCD FPCB electrically connected to the LCD panel and electrically connected to the LED FPCB.

LCD module comprising a.

The method of claim 1,

The chassis has a 180 degree folded LCD module.

The method according to claim 1 or 2,

The LCD FPCB includes a grounding pad for grounding, wherein the grounding pad is electrically connected to the grounding pad of the LCD FPCB.