KR100609245B1 - Tiled liquid crystal display device - Google Patents

Abstract

A tiled liquid crystal display device in which deterioration of liquid crystal is prevented is disclosed. Air inlets penetrating from the printed circuit board to the reflecting plate are formed in a portion corresponding to the longitudinal direction of the lamp so that external cool air flows into the mold frame, and the LCD modules are formed in the mold frame of the mounting frame in which the LCD modules are mounted in rows and columns. Another air inlet is formed in a portion corresponding to the air inlet, and a hot air outlet is formed in a predetermined area of the mounting frame in which the air inlet is not formed, and a cooling fan is provided at the rear of the mounting frame corresponding to the air outlet. Install. Therefore, the hot air inside the tiled liquid crystal display and the cold air outside are quickly exchanged to prevent deterioration of the liquid crystal.

Description

Tiled Liquid Crystal Display {TILED LIQUID CRYSTAL DISPLAY DEVICE}

1 is an exploded perspective view showing the structure of a tiled liquid crystal display device according to the present invention;

FIG. 2 is an enlarged view illustrating main parts of an enlarged portion A of FIG. 1;

3 is a cross-sectional view of the tiled liquid crystal display device taken along line I-I after assembling FIG.

4 is a cross-sectional view of a tiled liquid crystal display device taken along line II-II after assembling FIG. 1.

5 is an exploded perspective view showing the structure of the LCD module of the tiled liquid crystal display according to the present invention;

6 is a perspective view illustrating a rear surface of the LCD module structure.

The present invention relates to a tiled liquid crystal display device, and more particularly, to a tiled liquid crystal display device in which an LCD module and a mounting frame are modified to prevent deterioration of liquid crystal injected into an LCD panel.

In general, the liquid crystal display device, which has been spotlighted as an alternative to the CRT, has advantages such as light weight, thinness, and low power consumption, and its demand is rapidly expanding. Large surface area is required. However, due to the characteristics of the liquid crystal display device, there is a limit to increasing the screen size on which an image is displayed. The screen size of the largest liquid crystal display device known so far is 22 inches, which is theoretically known to be possible to 40 inches.

As a result, a so-called projection TV, which mounts an optical system on a small LCD panel and displays a large image on a screen, has recently emerged. In recent years, a tiled liquid crystal device in which several liquid crystal display devices are connected to make a large display device. The display device is put into practical use.

A tiled liquid crystal display is fixed to a plurality of small LCD modules having a size of 6 × 6 inches or 6 × 8 inches to a mounting frame as shown in US Patent Nos. 4,980,775, 5,067,021, 5,068,740, and 5,079,636. The big screen is implemented. Here, in order to prevent the image from being interrupted between the LCD module and the LCD module so that the boundaries of the LCD modules are not clearly distinguished from the human eye, the intervals between the LCD modules are arranged equal to the intervals between the pixels formed on each LCD module. To extend the image displayed on each LCD module to the edge of the LCD module.

Such a tiled liquid crystal display device is composed of small LCD modules that display a large image and a mounting frame in which the small LCD modules are mounted in a plurality of rows and columns, wherein the LCD module generates light and guides light. A backlight assembly, an LCD panel installed on an upper surface of the backlight assembly to display an image, a printed circuit board fixed to the lower surface of the backlight assembly to drive the LCD module, and electrically connecting the LCD panel to the printed circuit board. Consists of heat seal connector.

The backlight assembly includes a mold frame having a predetermined depth along a top edge and a plurality of lamp insertion holes formed on both sides of the longitudinal direction, and a plurality of lamps inserted into the lamp insertion holes to penetrate each row of LCD modules. . Here, white paint is applied to each side and the bottom surface of the storage space of the mold frame in order to reflect light emitted from the lamp.

The compact LCD modules configured as described above are mounted in four rows and columns on the mounting frame and are in close contact with the LCD modules adjacent to each other to prevent the boundary portion from being visually identified.

After attaching the small LCD modules to the mounting frame, some of the light emitted from the lamp is transferred directly to the LCD panel, and the others are reflected from the white paint applied to the base of the storage space. By being delivered, it displays the desired color on the LCD panel.

However, since the light transmitted from the lamp is reflected by the white paint and is lost to the LCD panel, the light is lost. Therefore, the brightness is lowered, and the light brightness of the area corresponding to the lamp and the area not corresponding to the lamp is different from each other. Since the light uniformity is different.

In order to overcome such a problem, when a large number of lamps are installed in the LCD module, raw material cost and power consumption are increased, and since a large amount of heat is generated in the lamp assembly, the liquid crystal injected into the LCD panel is easily deteriorated and the color is degraded.

Accordingly, the present invention has been devised in view of the above problems, and an object of the present invention is to quickly release heat generated from a lamp to the outside.

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According to one side of the present invention, the outer surface of the mold is formed on each side wall surface of the mold frame through which light is transmitted and a receiving groove having a predetermined depth is formed on the upper surface and a plurality of lamp insertion holes are formed on opposite side walls. A plurality of lamps are installed in the lamp insertion hole to penetrate the mold frames installed in the same row of the mounting frame, and a reflecting plate for reflecting the light emitted from the lamp toward the LCD panel is installed on the base surface of the receiving groove. A diffuser plate between the and LCD panels.

Preferably, the reflecting plate is formed to be flat with the portion corresponding to the lamp and the portion not corresponding to the lamp is formed to be inclined toward the diffuser plate from the flat portion.

According to another aspect of the present invention, the air inlet penetrating from the printed circuit board to the reflecting plate is formed in a portion corresponding to the longitudinal direction of the lamp so that external cool air flows into the mold frame, and the LCD modules are mounted in rows and columns. Another air inlet is formed at a portion of the mounting frame corresponding to the air inlet formed in the mold frame, and an air outlet for discharging hot air is formed in a predetermined region of the mounting frame in which the air inlet is not formed. Install a cooling fan on the rear of the mounting frame and fasten the cover to the top of the mounting frame.

Hereinafter, the structure of a tiled liquid crystal display according to the present invention will be described with reference to FIGS. 1 to 6.

As shown in FIG. 1, the tiled liquid crystal display device 1 according to the present invention includes a plurality of LCD modules 100 for displaying an image and LCD modules 100 mounted in columns and rows to display a large screen. The mounting frame 200 to be implemented, the cooling fan 300 is installed in a predetermined region of the lower surface of the mounting frame 200 to discharge the high temperature heat generated by the LCD module 100 to the outside, and the mounting frame 200 Is coupled to the cover to prevent the outside air from flowing in the upper portion of the mounting frame 100 and a plurality of the cover 400 to the LCD module 100 is in close contact.

The LCD modules 100 of the tiled liquid crystal display device 1 configured as described above have a backlight assembly 110 which emits light and transmits the emitted light upward as shown in FIGS. 5 and 6, and a backlight. The LCD panel 180 is installed on the top surface of the assembly 110 to display information, and the printed circuit board 190 is installed on the bottom surface of the backlight assembly to drive the LCD panel.

As shown in FIG. 5, the backlight assembly 110 according to the present invention is formed of a material that transmits light and is formed on a mold frame 120 having a rectangular shape, and installed on a base surface of the mold frame 120, and the LCD panel 180. A reflector plate 140 for uniformly reflecting light toward the outer surface, an outer side reflective sheet 145 attached to each side surface of the mold frame 120 to prevent light from leaking out, and a mounting frame 200 in the same row. The lamp 150 is installed on the side of the mold frame 120 to penetrate the LCD modules 200 positioned therebetween, and is attached to the upper surface of the mold frame 120 via an adhesive (not shown), and the reflector plate 140 is disposed on the reflective plate 140. It consists of a diffuser plate 160 for diffusing the transmitted light, the LCD panel 180 is attached to the upper surface of the diffuser plate 160 via a transparent double-sided tape (not shown).

Here, the receiving groove 122 of a predetermined depth is formed along the edge of the upper surface of the mold frame 120, the outer side of each side wall of the mold frame 120, the sheet attachment groove in the same size as the outer surface reflective sheet 145 124 is formed, the sheet attachment groove 124 facilitates the attachment of the outer side reflective sheet 145 as well as between the mold frame 120 and the mold frame 120 due to the outer side reflective sheet 145. Prevents gaps in the

In addition, the lamp insertion holes 126 for inserting the lamp 150 are formed in the longitudinal side walls of the mold frame 120 to be larger than the diameter of the lamp 150, and three or more are formed at equal intervals. Luminance compensation holes 128 are formed at both sides of the insertion hole 126 so that the luminance is lower than the luminance of the portion corresponding to the lamp 150, that is, the upper surface of both side walls of the mold frame 120 in the longitudinal direction. The brightness of a portion that does not correspond to the lamp 150 is increased.

Meanwhile, as shown in FIG. 4, the thickness of the mold frame 120 from the middle of the widthwise side walls of the mold frame 120 to the upper surface of the mold frame 120 is thinner than the thickness of the sidewall of the mold frame 120 to the LCD. The luminance at the widthwise edge of the panel 180 is compensated for.

In addition, as shown in FIG. 5, a portion of the lower surface of the mold frame 120 corresponding to each lamp 150 includes an air inlet 130 for introducing external air into the mold frame 120. 150) along the longitudinal direction.

Here, the air inlet 130 is not formed only on the lower surface of the mold frame 120, but as shown in FIG. 6, the printed circuit board 190 and the reflecting plate (P) may pass through the printed circuit board 190 to the reflecting plate 140. 140 is also formed. The reason why the air inlet 130 is formed along the longitudinal direction of the lamp 150 is because the air inlet 130 is covered by the lamp 150 and thus does not affect light reflection at all.

Preferably, only one air inlet 130 may be formed to extend in the longitudinal direction of the lamp 150, or may be partially formed to have a predetermined size along the longitudinal direction of the lamp 150.

Preferably, the material of the mold frame 120 is acrylic or methacrylic used as the material of the light guide plate in the general LCD module.

Reflector plate 140 is a base plate 142 that is injected into a predetermined shape as shown in Figure 4, and the reflective sheet 144 attached to the upper surface of the base plate 142 in the same shape as the base plate 142 The base plate 142 of the base plate 142 corresponding to the lamp 150 is formed flat, the portion not corresponding to the lamp 150 extends inclined toward the diffuser plate 160 from the flat portion of the base plate 142 Is formed. Therefore, the reflector plate 140 positioned between the lamp insertion holes 126 is bent in a triangular pyramid shape and diffusely reflects the light emitted from the lamp 150 in various directions, thereby not corresponding to the part corresponding to the lamp 150. Set the brightness of the light to the same.

Preferably, the base plate 142 is injected separately from the mold frame 120 to fasten the screw 143 to each corner of the mold frame 120 to fix the base plate 142 as shown in FIG. .

Alternatively, the process of fastening the base plate 142 to the mold frame 120 by injecting the base plate 142 integrally with the mold frame 120.

The number 132 protruding from the lower surface of the mold frame 120 at a predetermined height is a fixing piece for fixing the LCD module 100 to the upper surface of the mounting frame 200.

Reference numeral 170 is an optical curtain that increases the brightness by selectively corroding only the portion that does not correspond to the lamp 150 of the light.

Meanwhile, the mounting frame 200 constituting the large screen by mounting a plurality of LCD modules 100 having the above-described structure has sidewalls 205 having predetermined heights at both ends in the longitudinal direction facing each other in a rectangular shape as shown in FIG. 1. ) Is formed.

In addition, inside the mounting frame 200 spaced apart from the sidewalls 205 by a predetermined interval extending in the width direction of the mounting frame 200 to prevent hot air from entering the LCD module 100 ( 210 is formed at the same height as the mold frame 120, and the blocking plate 210 is formed with a first air outlet 216 for discharging hot air inside the mold frame 100. Here, the first outlet 216 is formed in the same size as the lamp insertion hole 126 in a position corresponding to the lamp insertion hole 126 formed in the mold frame 120.

In addition, between the blocking plate 205 and the blocking plate 205, there is a mounting area 220 in which the LCD modules 100 are arranged in a plurality of rows and columns, as shown in FIG. 2. Insertions 232 for inserting and fixing the fixing piece 132 are formed at a position corresponding to the fixing piece 132 among the predetermined regions in which the 100 is mounted.

As shown in FIGS. 2 and 3, an air inlet 230 for introducing cool air into the air inlet 130 of the mold frame 120 is formed inside the insertion pieces 232. The air inlet 230 is formed larger than the air inlet 130 of the mold frame 120 to include an air inlet 130 formed in the mold frame.

Preferably, the air inlet 230 of the mounting frame 200 may be formed in the entire area between the insertion pieces 232, or may be formed by dividing into a plurality.

On the other hand, between the side wall 205 and the blocking plate 210 of the upper surface of the mounting frame 200, a second air outlet 240 for discharging hot air to the outside of the mounting frame 200 is formed, the second air The cooling fan 300 is installed on the lower surface of the mounting frame 200 corresponding to the outlet 240 to exchange hot air inside the mold frame 120 with cold air outside the mounting frame 200.

Cooling fan 300 is a body 310 is formed with a circular hole 312 in the center, as shown in Figure 1, the propeller 320 is fastened to the body 310 to suck hot air, and the propeller ( It is connected to the 320 and fixed to the body 310 is composed of a motor 330 for rotating the propeller 320.

The cover 400 includes an opening 410 formed at an upper surface of the LCD module 100 so as to correspond to the entire screen size of the LCD modules 100 so that the screens of the LCD modules 100 are exposed to the outside, and the sidewalls 205 formed thereon. The length of both sides of the corresponding cover 400 in the longitudinal direction is short due to the side wall 205, and the widthwise side of the cover 400 fixed to both ends in the width direction of the mounting frame 200 is the width of the mounting frame 200. The length of the side wall 205 and the side wall of the cover 400 are formed to be the sum of the lengths.

An operation process of the tiled liquid crystal display device configured as described above will be described below.

First, the light emitted from the lamp 150 is uniformly reflected on the upper surface of the base plate 142, for example, the base plate 142, which is manufactured to be separated from the mold frame 120. A reflective sheet 144 is attached to improve the uniformity.

Thereafter, the base plate 142 and the reflecting sheet 144 is placed on the base surface of the receiving groove 122, and the edge of the mold frame 120 and the edge of the reflecting plate 140 screws ( 143 is inserted to fix the reflector plate 140 to the mold frame 120.

Subsequently, an outer side reflecting sheet 145 is attached to the sheet attaching groove 124 formed on the outer wall of the mold frame 120 to reflect the light emitted from the lamp 150 into the mold frame 120.

As such, when the reflecting plate 140 and the sidewall reflecting sheet 145 are installed in the mold frame 120, a transparent adhesive is applied to the upper surface of the mold frame 120, and the diffusion plate 160 is disposed on the upper surface of the mold frame 120. The mold frame 120 and the diffusion plate 160 to be laminated, and a transparent double-sided tape that transmits 100% of light along the edge of the diffusion plate 160 is attached to the diffusion plate 160 and the LCD panel 180. Attach.

If a predetermined portion of the LCD panel 180 that does not correspond to the lamp 150 is darker than a predetermined portion corresponding to the lamp 150, the optical curtain 170 may be selectively corroded to only the portion that does not correspond to the lamp 150. It is further laminated between the diffusion plate 160 and the LCD panel 180.

As described above, when the LCD modules 100 are assembled, a small LCD is formed to have four or more columns and rows in the mounting area 220 formed between the blocking plate 210 and the blocking plate 210 of the mounting frame 200. Mount the modules 100. At this time, in order to prevent the LCD modules 100 from being detached from the mounting frame 200 or a gap is generated between the LCD modules 100, the fixing pieces 132 formed on the lower surface of the LCD module 100 are inserted. The piece 232 is combined to completely fix the LCD module 100 to the mounting frame 200.

As described above, when the LCD modules 100 are fixed to the mounting frame 200, lamp insertion holes 126 formed in the first and fourth columns of the LCD modules 100 and the fourth row as shown in FIG. 3 or 4. The first air outlets 216 formed on the blocking plate 210 are exactly matched, and the air inlet 130 formed in the mold frame is positioned inside the air inlet 230 formed in the mounting frame 200.

Thereafter, a plurality of lamps 150 are inserted through the first air outlet 216 and the lamp insertion hole 126, and the lamps 150 pass through all of the LCD modules 100 installed in the same row.

Subsequently, a cooling fan 300 for exchanging air is installed on a lower surface of the mounting frame 200 corresponding to the second air outlet 240, and the cover 400 is covered with an upper portion of the mounting frame 200. It prevents air from flowing in the upper portion of the LCD module 100 and keeps the LCD modules 100 in close contact with each other.

When the tiled liquid crystal display device 1 assembled through the above-described process is driven, a voltage is applied to the lamp 150 to emit light and the electrical signal is transmitted to the LCD panel 180, thereby being driven by the electro-optical property. The desired image is displayed on each LCD panel 180 by the liquid crystal.

As described above, a part of the light emitted from all sides of the lamp 150 is directly transmitted to the diffuser plate 160 to drive the LCD panel 180, and a part of the reflector is inclined to both sides of the part corresponding to the lamp 150. Diffuse reflection in various directions at 140 is transmitted to the diffusion plate 160.

At this time, the portion that does not correspond to the lamp 150 is formed to be inclined at a predetermined angle so that the brightness of the light directly transmitted from the lamp 150 to the diffuser plate 160 and diffusely reflected from the reflector plate 140, diffuser plate 160 The brightness of the transmitted light is the same.

On the other hand, the light transmitted from the side of the transparent mold frame 120 of the light emitted from the lamp 150 is again the mold frame 120 by the outer surface reflective sheet 145 attached to the four sides of the mold frame 120 Since the brightness of the light is increased by being reflected to the inside of the diffuser plate 160, some of the light transmitted through the sidewalls flows into the luminance reinforcement hole 128 and is immediately diffused from the luminance reinforcement hole 128. Is passed). Therefore, the brightness reinforcing hole 128 adjusts the brightness of a predetermined portion of the upper surface of the mold frame 120 corresponding to the lamp 150 and the brightness of a predetermined portion not corresponding to the lamp 150.

As such, light incident on the diffuser plate 160 through various paths is dispersed by the diffuser plate 160 and transferred to the LCD panel 180, thereby preventing any particular part from being noticeably brighter, thereby preventing uniformity of light. Is improved.

Therefore, the luminance of the portion of the LCD panel 180 corresponding to the lamp 150 and the portion of the portion not corresponding to the lamp 150 are the same.

On the other hand, when at least 12 lamps 150 emit light to drive the LCD panel 180, the high temperature heat of about 60 to 70 ° C is generated from the lamps 150, and as time passes, the tiled liquid crystal display device 1 The internal temperature of) increases continuously. As such, when the heat generated from the lamp 150 is transferred to the LCD panel 180, the liquid crystal performance of the LCD panel 180 is degraded, and the color filter is degraded, thereby degrading color.

Therefore, at least one cooling fan 300 installed on the bottom surface of the tiled liquid crystal display device 1 is driven to suck out the hot air from the inside of the tiled liquid crystal display device 1 to the outside and burn the external cold air. By introducing the inside of the yield liquid crystal display device 1, hot air is continuously changed to cold air.

3 and 4, when the cooling fan 300 is driven, the propeller 320 is rotated while the motor 330 rotates. As such, when the propeller 320 rotates, hot air in the mold frame 120 is sucked into the second air outlet 240 through the lamp insertion hole 126 and the first air outlet 216 by the rotational force. It is discharged to the outside of the liquid crystal display device 1.

On the other hand, the mold frame 120 through the air inlet 230 formed in the mounting frame 200 and the air inlet 130 formed on the lower surface of the mold frame 120 as the hot air is discharged to the outside. Since the liquid crystal is prevented from deteriorating, the liquid crystal and the color filter are deteriorated.

As described above, when the tiled liquid crystal display device 1 is manufactured, brightness and uniformity of light may be improved, and hot air heated by the lamp 150 may be prevented from affecting the LCD panel 180. Can be.

As described above, the present invention forms an air inlet and an outlet on a mounting frame on which the LCD modules are mounted, and forms another air inlet and an outlet on the mold frame to correspond to the air inlets and outlets formed on the mounting frame. The reliability of the tiled liquid crystal display may be improved by quickly exchanging hot air inside the display device and cold air outside.

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Claims (7)

A backlight assembly including a reflection plate for emitting and guiding light, an LCD panel fixed to an upper surface of the backlight assembly to display an image, and a printed circuit board installed on a lower surface of the backlight assembly to drive the LCD panel. Configured LCD modules; A mounting frame in which the LCD modules are mounted in a plurality of rows and columns on an upper surface thereof, wherein a first air inlet is formed in a predetermined region in which the LCD modules are mounted, and an air outlet is formed in the predetermined region; At least one cooling fan installed at a rear surface of the mounting frame corresponding to the air outlet to exchange hot air inside the LCD module with cold air; And And a cover which is covered on an upper portion of the mounting frame and is coupled to the mounting frame. The method of claim 1, wherein the backlight assembly, A mold frame having a predetermined depth on a top surface thereof, and having a plurality of lamp insertion holes formed on opposite side walls thereof; A plurality of lamps inserted into the lamp insertion hole to penetrate the LCD modules installed in the same row of the mounting frame; And a second air inlet formed to penetrate from the printed circuit board to the reflecting plate at a portion corresponding to the longitudinal direction of the lamp so that air introduced into the first air inlet flows into the mold frame. Yield LCD. 3. The tiled liquid crystal display of claim 2, wherein the lamp insertion hole is formed to be larger than the diameter of the lamp to discharge hot air inside the mold frame toward the air outlet. The tiled liquid crystal display of claim 2, wherein the first air inlet is formed in a region corresponding to the second air inlet. The barrier plate of claim 2, further comprising sidewalls of a predetermined height at both ends in the longitudinal direction of the mounting frame, and a blocking plate for preventing hot air from flowing into the mold frame inside the mounting frame spaced apart from the sidewall by a predetermined distance. Tiled liquid crystal display, characterized in that formed. The method of claim 5, wherein the air outlet, A first air outlet formed in the blocking plate so as to correspond to the lamp insertion hole; And a second air outlet formed between the sidewall of the mounting frame and the blocking plate and having the cooling fan installed thereunder. The method of claim 2, wherein the cooling fan, A body having a circular hole formed in a predetermined region; A motor installed in the hole and fixed to the body; And And a propeller fixed to the motor and configured to suck hot air in the mold frame toward the second air outlet by the rotational force of the motor.

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