KR20010017691A - Backlight assembly for an LCD - Google Patents

Abstract

PURPOSE: A backlight unit of liquid crystal display is provided to extend the lifetime of a lamp by exhausting the heat generated from the lamp and prevents the degradation of gas sealed inside the lamp. CONSTITUTION: A thermal conductive radiator is mounted between the inner wall of a frame(130) and a lamp reflecting plate(166) or a bottom chassis(140) contacts with the lateral and lower surfaces of the lamp reflecting plate(166). The heat generated from a lamp(162) is efficiently discharged by the expansion of contact area between the bottom chassis(140) and the lamp reflecting plate(166). Exactly, the heat generated from the lamp(162) is directly conducted to the bottom chassis(140) via the lower and lateral surfaces of the lamp reflecting plate(166) or the bottom chassis(140) via the thermal conductive radiator. Therefore, a temperature around the lamp(162) is lowered by the effective exhaust.

Description

Backlight assembly for liquid crystal display

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backlight assembly of a liquid crystal display device, and more particularly, by inserting a member having excellent thermal conductivity between an inner wall of a frame and a lamp reflector to increase the contact area between the lamp reflector and the bottom chassis, thereby generating a lamp unit. The present invention relates to a backlight assembly of a liquid crystal display device that effectively emits heat.

Cathode ray tube (CRT), which is one of the commonly used display devices, is mainly used for monitors such as televisions, measuring devices, information terminal devices, etc., but due to its own weight and size, It could not actively respond to the demand for miniaturization and weight reduction.

In order to replace the cathode ray tube, it has advantages such as small size, light weight, low power consumption, and the like, and a liquid crystal display device that displays information by using the electrical and optical properties of the liquid crystal injected into the LCD panel has been actively developed. The function has been improved so that it can fully function as a flat panel display device.

Unlike the cathode ray tube, such a liquid crystal display device is not a light emitting material that can generate light, but a liquid crystal material injected between the TFT substrate and the color filter substrate. A separate light source for irradiating light to the LCD panel, that is, a backlight assembly is necessary, and the performance of the backlight assembly greatly affects the display quality of the liquid crystal display device.

The backlight assembly includes a frame in which a storage space is formed, a bottom chassis fastened to the bottom surface of the frame, a reflection sheet, a light guide plate, an optical sheet, and a light guide plate that transmits light to the LCD panel and is sequentially installed on the base surface of the storage space, and side walls of the storage space. It is composed of a lamp unit installed between and emitting light, and a top chassis covering from a predetermined portion of the edge of the LCD panel installed on the top of the frame to the side of the frame.

At least one lamp unit is installed on the side of the light guide plate to emit light, and diffuses the light emitted from the lamp to the light guide plate to improve the efficiency of the light and to supply power to the lamp reflector and the lamp surrounding the outer surface of the lamp It includes an inverter.

In such a structure, since the lower surface of the lamp reflector is in contact with the bottom chassis made of metal, heat generated from the lamp is conducted to the bottom chassis through the lamp reflector, and thus the ambient temperature of the lamp is lowered.

Therefore, in the small liquid crystal display device in which one lamp is provided on the side of the light guide plate and the lamp length is short, heat is effectively emitted even when only one surface of the lamp reflection plate is in contact with the bottom chassis as described above, so that the reliability of the liquid crystal display device is not impaired. Do not.

However, in the case of a large liquid crystal display device in which at least two or more lamps are installed on the side of the light guide plate in order to gradually increase the size of the liquid crystal display device and to obtain sufficient brightness, the bottom chassis and the lamp reflector are in contact with only one side. In this case, since the heat generated from the lamps is not sufficiently radiated through the bottom chassis, the reliability of the liquid crystal display is degraded.

That is, the gas encapsulated inside the lamp deteriorates and the life of the lamp decreases, and the internal temperature of the liquid crystal display increases, resulting in deterioration of the liquid crystal.

Accordingly, an object of the present invention is devised in view of the above problems, and increases the contact area between the lamp reflector and the bottom chassis to effectively release heat generated from the lamp to extend the life of the lamp and improve the image quality of the liquid crystal display device. To improve.

Other objects of the present invention will become more apparent from the following detailed description and the accompanying drawings.

1 is a cross-sectional view showing the structure of a liquid crystal display device according to a first embodiment of the present invention.

2 is a cross-sectional view showing the structure of a liquid crystal display device according to a second embodiment of the present invention;

In order to achieve the above object, the present invention inserts heat dissipation means for increasing the contact area between the lamp reflector and the bottom chassis between the inner wall of the frame and one side surface in the width direction of the lamp reflector.

For example, the heat dissipation means is a heat conductive heat sink having a length longer than the height of one side in the width direction of the lamp reflecting plate and facing one side of the lamp reflecting plate and having adhesive strength, and one side having the adhesive force is one side in the width direction of the lamp reflecting plate. A predetermined portion of the lower end portion of the thermal conductive heat sink attached to the bottom chassis and in contact with the bottom chassis is bent in a direction opposite to the lamp and attached to the bottom chassis.

As another example, the heat dissipation means is a side wall of the bottom chassis bent toward the LCD panel near the side wall of the storage space.

Hereinafter, the backlight assembly structure of the liquid crystal display according to the present invention will be described with reference to FIGS. 1 and 2.

As shown in FIG. 1 and FIG. 2, the liquid crystal display device 100 largely supports the LCD panel 110 displaying information using the electrical and optical properties of the liquid crystal, and supports the LCD panel 110 to emit light. The backlight assembly 120 increases the luminance of the emitted light and transmits the brightness to the LCD panel 110.

The backlight assembly 120 is penetrated in a rectangular shape from the upper surface to the lower surface, and the bottom chassis 140 is fastened to the lower surface of the frame 130 and fastened to the lower surface of the frame 130. ), The reflective sheet 150, the light guide plate 152, and the optical sheet 154, which are installed in order from the bottom surface of the storage space closed by the bottom chassis 140, increase the brightness of the light and transmit the light to the LCD panel 110. The lamp unit 160 is disposed between the side walls of the storage space on the longitudinal side of the light guide plate 152 and emits light from the edge of the LCD panel 110 installed on the upper surface of the frame 130. It wraps up to the side and includes a top chassis 170 fastened to the frame 130.

Preferably, the frame 130 is formed of a plastic material, the bottom chassis 140 is formed of a metal material, that is, a good thermal conductivity than the plastic, that is, aluminum.

Among the members constituting the backlight assembly 120, at least one lamp unit 160 is installed at a side of the light guide plate 152 to be fitted to both ends of the lamp 162 and the lamp 162 to emit light to protect the lamp. The lamp holder 164 and the lamp 162 are enclosed and the side opposite to the light guide plate 152 is opened to be fitted to one end of the light guide plate 152 in the longitudinal direction, and the light emitted from the lamp 162 is diffusely reflected toward the light guide plate. Lamp reflector 166 and an inverter (not shown) electrically connected to the lamps 162 by a wire to improve efficiency.

Here, in the case of a small liquid crystal display device, one lamp 162 is installed on the side of the light guide plate 152, but at least two lamps are provided on the side of the light guide plate 152 to obtain sufficient luminance as the liquid crystal display device 100 becomes larger. The above lamps 162 are installed.

As described above, when at least two lamps 162 are installed on the side of the light guide plate 152 and the length of the lamps 162 is increased due to the enlargement of the liquid crystal display device 100, a large amount of heat is generated in the lamps 162. The heat generated by the lamp 162 must be quickly discharged to the outside of the liquid crystal display 100 to lower the internal temperature of the liquid crystal display 100.

Therefore, in the present invention, the bottom chassis 140 formed of a metal material is brought into contact with the lower surface of the lamp reflector 150 and is disposed between one side of the lamp reflector 166 facing the sidewall of the storage space and the sidewall of the storage space. As shown in FIG. 1 and FIG. 2, a member having a good thermal conductivity is inserted to increase the contact area between the lamp reflector 166 and the bottom chassis 140.

With reference to Figures 1 and 2 will be described in more detail as follows.

According to the first embodiment of the present invention, as shown in FIG. 1, a thermoelectric is formed between a side wall of an accommodating space surrounding one side in the width direction from the top surface of the lamp reflector 166 and one side in the width direction of the lamp reflector 166. The thermal conductive heat dissipation plate 180 of a good metal material is installed, and one surface of the thermal conductive heat dissipation plate 180 is adhesive and is formed to have a length longer than the side height of the lamp reflector 140.

A predetermined portion of the lower end portion of the thermally conductive heat sink 180 attached to one side of the thermally conductive heat sink 180 in the width direction side surface of the lamp reflector 166 and adjacent to the bottom chassis 140 is the lamp 162. It is bent in the opposite direction and attached to the bottom chassis 140.

Therefore, the lower surface of the lamp reflector 166 is in direct contact with the bottom chassis 140, and one side in the width direction of the lamp reflector 166 is in contact with the bottom chassis 140 by the thermal conductive heat sink 180. The contact area between the 166 and the bottom chassis 140 is greatly increased as compared with the related art.

However, as in the first embodiment, when the thermally conductive heat sink 180 is installed between the side wall of the storage space and one side of the lamp reflection plate 166 in the width direction, the number of assembly processes is increased, and a separate componentized thermal conductive heat sink ( 180, the raw material cost of the liquid crystal display device 100 is increased.

In order to solve this problem, the second embodiment is a sidewall of the bottom chassis 140, that is, a portion bent toward the LCD panel 110 near the sidewall of the storage space as shown in FIG. 2. The lower surface of the lamp reflector 166 and the side surface of the lamp reflector 166 are in contact with the bottom chassis 140 to be positioned between one side of the width direction of the 166 in contact with the bottom chassis 140 and the lamp reflector 166. To increase.

As described in the first and second embodiments, a thermally conductive heat sink 180 is provided between the inner wall of the frame 130 and the lamp reflector 166 or the side wall of the bottom chassis 140 of aluminum is positioned. When the side and bottom surfaces of the lamp reflector 166 are in contact with the bottom chassis 140, the contact area between the lamp reflector 166 and the bottom chassis 140 is increased.

Therefore, heat generated when the lamp is turned on by applying a current to the lamp 162 is directly conducted to the bottom chassis 140 through the bottom and side surfaces of the lamp reflector 166 or the widthwise side of the lamp reflector 166. From the bottom to the bottom chassis 140 attached to the thermally conductive heat sink 180 is then conducted by the thermally conductive heat sink 180 back to the bottom chassis 140 to emit heat generated in the lamp 162 over a large area As a result, the temperature around the lamp 162 is lower than in the related art.

As described above, the present invention provides a heat generated from the lamp by inserting a member having excellent thermal conductivity between the widthwise side surface of the lamp reflector and the inner wall of the frame surrounding the lamp reflector to increase the contact area between the bottom chassis and the lamp reflector. Effectively releases.

Therefore, deterioration of the gas enclosed in the lamp can be prevented and the life of the lamp is increased.

In addition, since the ambient temperature of the lamp unit decreases due to an increase in the contact area between the lamp reflector and the bottom chassis, the brightness of the lamp may be improved and the liquid crystal may be prevented from deteriorating, thereby improving the image quality of the liquid crystal display device.

Claims (5)

A frame having a storage space penetrated from an upper surface to a lower surface, a bottom chassis fastened to the lower surface of the frame to close the lower surface of the frame, and sequentially installed from a base surface of the storage space to provide brightness of light; A reflection sheet, a light guide plate, and an optical sheet which are raised and transmit light to an LCD panel provided on an upper surface of the frame, a lamp installed on at least one side of the light guide plate to emit light, and the light guide plate opposite to the lamp. A backlight assembly surrounding the lamp from an end and including a lamp reflector for reflecting the light emitted from the lamp to the light guide plate, And a heat dissipation means for increasing a contact area between the lamp reflector and the bottom chassis between the side wall of the storage space and one side surface in the width direction of the lamp reflector. The backlight assembly of claim 1, wherein the heat dissipation means is made of a metal having good thermal conductivity. The heat dissipating means of claim 2, wherein the heat dissipation means is formed to have a length longer than a height of one side of the lamp reflector in a width direction, and is a thermally conductive heat sink having an adhesive force on one surface facing the lamp reflector. And a predetermined portion of a lower end portion of the thermal conductive heat sink attached to one side of the lamp reflector in the width direction and in contact with the bottom chassis is bent in a direction opposite to the lamp and attached to the bottom chassis. 3. The backlight assembly of claim 2, wherein the heat dissipation means is a side wall of the bottom chassis bent toward the LCD panel near the side wall of the storage space. 5. The backlight assembly of claim 4, wherein the bottom chassis is made of aluminum.