KR101268948B1 - Liquid Crystal Display Module - Google Patents

Abstract

The present invention is to improve the reliability of the liquid crystal display device by preventing heat generated from the light source from being diffused into the driving circuit of the liquid crystal display device in the direct type backlight structure. A lamp, a bottom cover on which a plurality of lamps are seated on a bottom surface, and an optical sheet on the top thereof, a guide panel that is tightly coupled to the bottom cover while supporting the liquid crystal panel, and a driving circuit connected to a signal line pad formed at an edge of the liquid crystal panel And a chip package mounted at a position adjacent to the guide panel, and a heat dissipation wall disposed between the guide panel and the bottom cover to prevent the heat generated from the lamp from being diffused into the driving circuit. To provide.

Liquid crystal panel, lamp, heat resistant, heat dissipation wall

Description

Liquid Crystal Display Module

1 is a cross-sectional view illustrating a liquid crystal display module using a direct type backlight unit according to the prior art.

2 is a perspective view of a liquid crystal display module using a direct type backlight unit according to an exemplary embodiment of the present invention.

3 is a cross-sectional view taken along the line III-III shown in FIG. 2.

DESCRIPTION OF THE REFERENCE NUMERALS (S)

100; liquid crystal display module 110; bottom cover

120; LED lamp 130; multiple optical sheets

140; liquid crystal panel 150; guide panel

160; top cover 172; drive circuit

174 chip package 176 printed circuit board

180; heat shield

The present invention relates to a module of a liquid crystal display device, and more particularly, to a liquid crystal display module which further improves reliability of a liquid crystal display device by blocking heat generated from a light source in a direct backlight structure.

In recent years, the need for a flat panel display has emerged in order to meet the times of thinning, weight reduction, and low power consumption.

Accordingly, a thin film transistor type liquid crystal display device (hereinafter referred to as TFT-LCD) having excellent color reproducibility and thinness has been developed.

A liquid crystal display (LCD) displays an image corresponding to a data signal on a panel by adjusting the light transmittance of liquid crystal cells arranged in a matrix form on a liquid crystal panel with a video data signal supplied thereto.

Most of the liquid crystal display devices for this purpose need a separate light source for irradiating light to the liquid crystal panel, that is, a backlight unit.

In general, a backlight unit for a liquid crystal display device is a cylindrical fluorescent lamp is arranged, and divided into an edge type and a direct type according to the arrangement position.

The edge type backlight unit has a structure in which a lamp unit is installed on a side of a light guide plate for guiding light, and the lamp unit surrounds a lamp that emits light, a lamp holder inserted at both ends of the lamp to protect the lamp, and an outer circumferential surface of the lamp. One side is provided on the side of the light guide plate and has a reflector for reflecting the light emitted from the lamp toward the light guide plate.

Such an edge type backlight unit is mainly applied to a relatively small liquid crystal display device such as a monitor of a laptop computer or a desktop computer because of good light uniformity, long durability, and thinning of the liquid crystal display device.

On the other hand, the direct type backlight unit is mainly developed as the size of the liquid crystal display device is increased to 20 inches or more. To investigate.

Such a direct type backlight unit is mainly used for a large screen liquid crystal display device that requires high luminance because the light utilization efficiency is higher than that of the edge type.

However, the liquid crystal display device using the direct type backlight unit is used for a large monitor or a television, and the use time is longer than that of a laptop computer and the number of lamps is increased. There is a frequent problem that the lamp does not turn on due to a failure and short life of the lamp.

The light source of the edge-type and direct-type liquid crystal display devices includes EL (Electro Luminescence), LED (Light Emitting Diode), CCFL (Cold Cathode Fluorescent Lamp), HCFL (Hot Cathode Fluorescent Lamp), and EEFL (External Electrode Fluorescent Lamp). ) Can be used.

Hereinafter, the direct type backlight unit according to the prior art will be described.

1 is a cross-sectional view showing a liquid crystal display module using a direct backlight unit according to the prior art.

As illustrated, a liquid crystal display module (hereinafter referred to as a liquid crystal display module (LCM)) of the liquid crystal display according to the prior art includes a bottom cover 10 and a bottom cover 10 positioned at the bottom thereof. A plurality of LED lamps 20 arranged on the inner bottom of the bottom, a plurality of optical sheets 30 located on the front of the bottom cover 10, a liquid crystal panel 40 located on the optical sheet 30, a liquid crystal panel ( A guide cover 50 for guiding 40 and a top cover 60 surrounding an edge of the liquid crystal panel 40 and an outer surface of the bottom cover 10 are included.

In addition, a tape carrier package (TCP) 74 having a drive integrated circuit 72 mounted thereon is installed on a signal line pad formed at an edge of the liquid crystal panel 40. 74 is connected to a printed circuit board (PCB) 76.

Reference numeral 80 is a support wall that supports the lower portion of the plurality of optical sheets 30 in the bottom cover 10.

At this time, the bottom cover 10 is usually made of a mold, metal, etc. serves to fix and support a plurality of LED lamps 20 and the optical sheet 30.

In addition, the guide panel 50 is also formed of a metal material to serve to support the liquid crystal panel 40 from below.

However, in the conventional liquid crystal display module configured as described above, the bottom cover 10 and the guide panel 50 are formed of a material having high thermal conductivity, and the drive integrated circuit 72 is disposed at a position adjacent to the guide panel 50. Since the printed circuit board 76 includes a structure in which the heat generated from the LED lamp 20, which is a heat source of the backlight unit, is transferred to the bottom cover 10, the heat sensitive guide panel 50 and the drive integrated circuit ( 72) there is a problem that heat is diffused.

That is, when heat is diffused into the drive integrated circuit 72, the thermal load of the drive integrated circuit 72 and the printed circuit board 76 may increase, causing a malfunction, and an overcurrent of the LED lamp 20 may increase. Therefore, there is a problem of lowering the quality of the liquid crystal display.

Accordingly, an aspect of the present invention is to provide a liquid crystal display module which improves reliability of a liquid crystal display device by blocking heat generated from a light source from being diffused into a driving circuit of the liquid crystal display device in a direct backlight structure.

Other technical problems to be achieved by the present invention are not limited to the above-mentioned technical problems, and other technical problems not mentioned above will be clearly understood by those skilled in the art from the following description. Could be.

The liquid crystal display module according to an embodiment of the present invention for achieving the above technical problem, a liquid crystal panel, a plurality of lamps for irradiating light to the liquid crystal panel, a plurality of lamps are seated on the bottom and the optical sheet is seated on the top A bottom cover, a guide panel that is in close contact with the bottom cover while supporting the liquid crystal panel, a chip package that is mounted at a position adjacent to the guide panel and mounted with a driving circuit connected to a signal line pad formed at an edge of the liquid crystal panel And a bottom cover in close contact with each other to include a heat dissipation wall for preventing heat generated from the lamp from being diffused into the driving circuit.

The bottom cover of the liquid crystal display module according to an embodiment of the present invention is a case having a bottom surface so that the plurality of lamps and the optical sheet is seated, and bent vertically at the top of the case to contact the guide panel. It is characterized by having a curved surface.

The heat dissipation wall has a structure overlapping with the upper end of the bottom cover while supporting the optical sheet in the bottom cover.

The heat dissipation wall is characterized in that the plastic material.

Specific details of other embodiments are included in the detailed description and the drawings. Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. Like reference numerals refer to like elements throughout.

Hereinafter, a liquid crystal display module according to an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a perspective view of a liquid crystal display module using a direct type backlight unit according to an exemplary embodiment of the present invention, and FIG. 3 is a cross-sectional view of the III-III line shown in FIG. 2.

The liquid crystal display module (LCM) 100 according to an exemplary embodiment of the present invention may include a bottom cover 110 positioned at the bottom, a backlight unit (not shown) mounted in the bottom cover 110, and The top cover 160 surrounding the edges of the liquid crystal panel 140 and the outer surface of the bottom cover 110 to guide and mount the liquid crystal panel 140 and the liquid crystal panel 140 stacked on the top. It includes. The chip package 174 is connected to a signal line pad formed at an edge of the liquid crystal panel 140, and a heat dissipation wall 180 is installed in the bottom cover 110.

In this case, the bottom cover 110 is bent horizontally at the top of the case 114 and the case 114 having a bottom surface 112 so that the backlight unit (not shown) can be mounted as shown in FIG. Bent surface 116. The bottom cover 110 is usually made of a mold, a metal, or the like.

The backlight unit (not shown) includes a plurality of LED lamps 120 for irradiating light to the liquid crystal panel 140, a reflector plate 125 disposed on the rear of the plurality of LED lamps 120, and a plurality of LED lamps 120. It is configured to include a plurality of optical sheets 130 located in.

In addition, the reflector plate 125 serves to reflect the light emitted to the rear surface of the LED lamp 120 to the liquid crystal panel 140, and the plurality of optical sheets 130 may reduce the light efficiency incident toward the liquid crystal panel 140. It has two diffusion sheets and a prism sheet.

As shown in the figure, a backlight unit (not shown) includes a plurality of LED lamps 120 having a reflector plate 125 installed at a rear side thereof, arranged on the inner bottom surface 112 of the bottom cover 110, and a bottom cover ( A plurality of optical sheets 130 is mounted on the front of the 110.

In the liquid crystal panel 140 positioned in front of the optical sheet 130, liquid crystal is injected between two upper and lower substrates to which polarizers are attached, and each of the liquid crystal pixel cells arranged in a matrix form is a thin film transistor. Driven by a transistor (TFT).

As shown in the guide panel 150, the support surface is vertically bent downward as shown, while supporting the liquid crystal panel 140 by the support surface and engaging with the bent surface 116 of the bottom cover 110, the bent side The cover serves to cover the bottom cover 110. Since the guide panel 150 is formed of a metal material, the guide panel 150 is sensitive to heat and has high thermal conductivity.

The chip package 174 is a Tape Carrier Package (TCP) installed between a printed circuit board (PCB) 176 connected to a signal line pad formed at an edge of the liquid crystal panel 140. A driver integrated circuit 172 for driving the liquid crystal panel 140 is mounted.

The chip package 174 is disposed at a position adjacent to the guide panel 150 as shown.

The heat dissipation wall 180 is installed in the bottom cover 110 to serve to support the plurality of optical sheets 130 from below, and as illustrated, between the guide panel 150 and the bottom cover 110 are coupled to each other. It is provided to prevent the heat generated from the LED lamp 120 to diffuse to the driving circuit 172 of the chip package 174. The heat dissipation wall 180 for this is made of a plastic material with excellent heat blocking effect.

For example, the heat dissipation wall 180 is provided in a columnar shape as shown, and a stepped portion 182 is formed on the top surface of the heat dissipation wall 180 to support the plurality of optical sheets 130 and extend horizontally on the top surface. The extension surface may be integrally provided to have an overlapped structure up to the top of the bottom cover 110.

Accordingly, in the liquid crystal display module 100 using the direct type backlight unit according to the present invention, a backlight unit including a plurality of LED lamps 120 is mounted in the bottom cover 110 to support the liquid crystal panel 140. The panel 150 is coupled to the bottom cover 110, and the heat dissipation wall 180 is inserted between the guide panel 150 and the bottom cover 110 coupled to each other to have a structure that blocks heat. Accordingly, even though heat generated from the LED lamp 120 is transferred to the bottom cover 110, the heat is blocked by the heat dissipation wall 180 to prevent the heat from being diffused to the guide panel 150 which is sensitive to heat. Furthermore, the heat generated from the LED lamp 120 is prevented from deteriorating the driving circuit 172 by blocking heat from being diffused into the driving circuit 172 of the chip package 174 disposed adjacent to the guide panel 150. can do.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood.

Therefore, it should be understood that the above-described embodiments are provided so that those skilled in the art can fully understand the scope of the present invention. Therefore, it should be understood that the embodiments are to be considered in all respects as illustrative and not restrictive, The invention is only defined by the scope of the claims.

In the liquid crystal display module according to the preferred embodiment of the present invention made as described above, the heat generated from the LED lamp is diffused toward the driving circuit adjacent to the guide panel by inserting the heat dissipation wall therebetween when the bottom cover and the guide panel are coupled to each other. It is possible to prevent the deterioration of the driving circuit by blocking it.

In addition, the reliability of the liquid crystal display module may be further improved by minimizing defects of the liquid crystal display module.

Claims (4)

A liquid crystal panel, A plurality of lamps for irradiating light to the liquid crystal panel, A bottom cover on which the plurality of lamps are seated on a bottom surface and an optical sheet is seated on an upper portion thereof; A guide panel tightly coupled to the bottom cover while supporting the liquid crystal panel; A chip package mounted on a driving circuit connected to a signal line pad formed at an edge of the liquid crystal panel and disposed adjacent to the guide panel; And a heat dissipation wall provided between the guide panel and the bottom cover to prevent the heat generated from the lamp from being diffused into the driving circuit. The bottom cover is Has a case provided with a bottom surface so that the plurality of lamps and the optical sheet is seated, and a bent surface which is bent vertically at the top of the case and abuts the guide panel, The heat dissipation wall is It has a columnar stepped portion for seating while supporting the plurality of optical sheets in the bottom cover, and an extension surface which is integrated with the stepped portion and extended horizontally to overlap the bent surface of the bottom cover, The guide panel and the bottom cover is made of a metal material, The heat dissipation wall is a liquid crystal display module, characterized in that made of a plastic material. delete delete delete

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