KR20010047614A - Direct lighting type of liquid crystal display - Google Patents

Abstract

PURPOSE: A liquid crystal display device is to reduce the number of parts used for a lamp unit, thereby reducing a manufacturing cost and a weight. CONSTITUTION: A mold frame(110) has a housing passing from a top face to a bottom face. A reflective plate(140) is formed at the housing disposed at the bottom face of the mold frame, in which a connection unit(150) is formed to be spaced away by a predetermined distance. A lamp unit(160) includes a plurality of lamps(162), a lamp holder(170) and a power supply unit. The plurality of lamps disposed at the top face of the reflective plate are spaced apart by a predetermined distance and has electrodes at both ends thereof. The lamp holder inserted into one end and the other end of the lamps supports the lamps to the top face of the reflective plate. The power supply unit for supplying a power to the lamps is electrically connected to the electrodes via wires. A diffusion plate disposed at the top of the lamps diffuses the light radiated from the lamps. An LCD panel(190) for displaying information is disposed at the top of the diffusion plate.

Description

Direct lighting type of liquid crystal display}

The present invention relates to a direct-type liquid crystal display device, and more particularly, to form fastening portions coupled to lamp holders at opposite ends of the reflecting plate to temporarily fix the lamps on the upper surface of the reflecting plate, The present invention relates to a backlight assembly of a direct type which completely fixes a lamp by using a reflecting plate and a mold frame by forming a pressing protrusion protruding a predetermined length toward the lamp holder on the side wall of the storage space between the upper surface and the diffusion plate.

CRT (Cathode Ray Tube), one of the commonly used display devices, is mainly used for monitors such as TVs, measuring devices, and information terminal devices.However, due to the weight and size of the CRT itself, Could not respond actively to demands.

In order to replace the CRT, a liquid crystal display device having advantages such as small size, light weight, and low power consumption has been actively developed, and recently, it has been developed enough to perform a role as a flat panel display device. In addition, the demand for the liquid crystal display device is continuously increasing as it is used for a monitor of a desktop computer and a large information display device.

Since most of the liquid crystal display devices are light-receiving devices that display images by controlling the amount of light coming from the outside, a separate light source for illuminating the LCD panel, that is, a backlight assembly, is required. It is divided into edge type and direct type according to the location where the unit is installed.

In the double-edge method, the lamp unit is installed on the side of the light guide plate for guiding the light, and the lamp unit covers a lamp emitting light, a lamp holder inserted at both ends of the lamp to protect the lamp, and an outer circumferential surface of the lamp, and one side It is provided with a lamp reflector plate fitted to the side of the light guide plate to reflect the light emitted from the lamp toward the light guide plate.

The edge method in which the lamp unit is installed on the side of the light guide plate is applied to a relatively small liquid crystal display device such as a monitor of a laptop computer and a desktop computer, and has good uniformity of light, a long service life, and a liquid crystal. It is advantageous to thin the display device.

On the other hand, as the size of the liquid crystal display device began to increase in size to 20 inches or more, a direct development method began to directly illuminate the front of the LCD panel by arranging a plurality of lamps in a row on the lower surface of the diffusion plate.

This direct type is mainly used for a large screen liquid crystal display device requiring high brightness because the light utilization efficiency is higher than that of the woven type.

However, in the case of the liquid crystal display device adopting the direct method, since many lamps are installed on the lower surface of the diffusion plate, lamps that do not turn on due to the failure and life of the lamp are more likely to appear than the edge method.

In addition, due to the life and failure of the lamp in the edge method in which the lamp unit is installed on both side surfaces in the width direction of the light guide plate, for example, when only one lamp is not turned on, only the brightness on the screen is lowered. However, in the direct method, since lamps are installed on the bottom of the screen, for example, when one lamp does not light up, a part where the lamp does not light up becomes dark due to lamp life and failure. Will appear immediately.

For this reason, since the lamp is frequently replaced in the direct type liquid crystal display device, the direct type liquid crystal display device should have an easy structure for disassembling and assembling the lamp unit.

Therefore, in the conventional direct-type liquid crystal display device, a slide slit is formed on the side surface of the bottom chassis corresponding to the lamp unit to facilitate disassembly and assembly of the lamp unit, and the lamp unit and the reflecting plate are divided into a plurality of longitudinal directions of the diffusion plate. Along the bottom of the diffuser plate. Then, after a predetermined time has elapsed, when a lamp that does not turn on occurs, the operator replaces only the lamp unit in which the lamp that does not turn on is installed to the outside of the liquid crystal display through the slide slit and replaces the lamp.

Here, each lamp unit is coupled to a plurality of lamp holders used for the light source of the liquid crystal display, for example, four lamps, two lamp holders respectively fitted to one end and the other end of the lamps to protect the lamps. It consists of lamp supports that facilitate the replacement of the lamp.

However, in order to assemble the lamp unit configured as described above, lamp holders are inserted at both ends of each lamp, the lamp support is coupled to the upper surface of the lamp holders, the reflector is positioned on the lower surface of the lamp holder, and the respective reflector plates are screwed or Since it is necessary to adhere to each other using adhesive tape, the assembly process is complicated and the assembly time takes a lot, and the productivity of the product is reduced.

In addition, since the lamp holders are coupled to the respective lamp holders, the weight of the liquid crystal display is increased, and the number of parts of the liquid crystal display is increased due to the lamp holders, thereby increasing the cost.

In addition, when the lamps installed on the lower surface of the diffusion plate do not light up at the same time, it is cumbersome to take out each lamp unit to the outside of the liquid crystal display and replace new lamps in each lamp unit, and the time required for the operation is long.

Accordingly, an object of the present invention is to conceive in view of the above problems, to simplify the assembly process of the lamp unit to improve the productivity of the product.

Another object of the present invention is to reduce the number of parts and to reduce the weight of the liquid crystal display.

Another object of the present invention is to reduce the time required to replace the lamp when all of the lamps are not lit.

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

1 is a partially cut perspective view schematically showing the structure of a liquid crystal display according to the present invention.

FIG. 2 is a cross-sectional view of FIG. 1 taken along line II-II.

Figure 3 is an exploded perspective view showing a coupling state of the reflector and the lamp unit according to the present invention.

In order to achieve the above object, the present invention provides a mold frame having a storage space penetrated from the upper surface to the lower surface, and is installed in the storage space formed on the lower surface side of the mold frame and is spaced apart from each other at predetermined portions in one width direction and the other end portion in the width direction. A plurality of lamps spaced apart from each other at predetermined intervals on the upper surface of the reflecting plate, and electrodes are formed at one end and the other end to emit light, and at one end and the other end of the lamps, respectively. A lamp unit comprising a lamp unit which is fitted and coupled with the fastening part and which is electrically connected to the electrode by a wire and with lamp holders for fixing the lamps to the upper surface of the reflecting plate, and for supplying power to the respective lamps; Installed on the diffuser plate and the top of the diffuser plate to diffuse the light emitted from the lamps. The LCD panel includes an LCD panel, wherein a predetermined length of a side wall of the storage space in which the reflector and the lamp unit are accommodated is protruded by a predetermined length toward the lamp holder and presses the lamp holder together with the reflector to reflect the lamps. A pressing protrusion is formed to completely fix the upper surface of the.

Preferably, the pressing protrusion is formed at a point raised slightly lower than the height of the lamp holder toward the diffuser plate at a point corresponding to the upper surface of the reflecting plate on which the lamp holder is installed on the sidewall of the storage space.

Alternatively, a pressing protrusion is formed at a point of the side wall of the storage space that rises by the height of the lamp holder toward the diffuser plate at a point corresponding to the upper surface of the reflecting plate on which the lamp holder is installed.

Hereinafter, the structure of a direct liquid crystal display device according to the present invention will be described with reference to FIGS. 1 to 3.

The liquid crystal display device 100 of the direct type according to the present invention is installed in the storage space of the mold frame 110, the mold frame 110, the rectangular storage space is formed from the upper surface to the lower surface as shown in FIG. Reflector plate 140 for reflecting light in the upper direction, the lamp unit 160 is installed on the upper surface of the reflector plate 140 to emit light, the lamp unit 160 is installed on top of the lamp unit 160 is emitted from the lamp unit 160 Diffusion plate 185 for diffusing light, the bottom chassis 180 is fastened to the lower surface of the mold frame 110 to support the reflector plate 140 and the lamp unit 160, installed on the upper surface of the mold frame 110 And a top chassis 195 that wraps from the edge of the LCD panel 190 to the side of the mold frame 110 to display information.

For convenience of description, the configuration of the lamp unit 160 among the aforementioned members will be described as follows.

As shown in FIG. 3, the lamp units 160 are installed to be spaced apart from each other by a predetermined distance along the longitudinal direction of the reflector 140, and electrodes 163 and 164 to which power is applied at one end and the other end are formed to form the liquid crystal display device 100. A plurality of lamps 162 used as a light source of the lamps, and lamp holders 170 respectively fitted to one end and the other end of the lamps 162 to protect the lamp 162 and to fix the lamps 162 to the reflector plate 140. And an inverter (not shown) electrically connected to the electrodes 163 and 164 of the lamps 162 by wires 166 and 168 to supply power to the respective lamps 162.

Here, the lamp holder 170 is a body 172 formed of a rubber material, and the lamp insertion groove 174 and the body 172 is formed in a predetermined region of the upper end of the body 172 and the end of the lamp 162 is fitted. The guide slit 176 is formed in a predetermined area of the lower end and fixes the lamp holder 170 to the reflector plate 140.

The lamp insertion groove 174 is formed in a shape corresponding to the lamp 162 on a side of the upper end of the body 172 adjacent to the diffusion plate 185 opposite the lamp 162.

In addition, the guide slit 176 is formed in a predetermined area of the lower end of the body 172 spaced a predetermined distance from the lamp insertion groove 174 toward the reflecting plate 140, the guide slit 176 is the body facing the lamp 162 It is formed extending from one side of the other side to the other side to a predetermined depth, when the lamp holder 170 is fixed to the reflecting plate 140, one side and the other side of the body 172 located in the longitudinal direction of the reflecting plate 140 One on each side is formed.

Next, the reflector plate 140 to which the lamp 162 is primarily fixed will be described.

The protrusion 142 is formed such that the remaining portion except for the portion spaced apart from the edge of the reflector plate 140 by the predetermined length from the edge of the reflector plate 140 protrudes toward the diffuser plate 185 along the edge of the reflector plate 140. do. The lamps 162 are arranged on the upper surface of the protrusion 142.

In addition, the wire 168 is formed on one side edge 144 and the other side edge 146 of the reflective plate 140 formed on the slope of the protrusion 142 and lower than the protrusion 142 to be in contact with the bottom chassis 180. Female threads 145 for fixing the reflecting plate 140 to the mold frame 110 are formed at each edge of the reflecting plate 140. The widthwise edges of the reflecting plate 140 are formed. Female threads 145 are formed between the beads 148 at 144 and 146.

Here, the reason for forming the protrusion 142 and the bead 148 on the reflector plate 140 is that the wire 168 electrically connected to the cold side electrode 164 through which current is returned among the wires 166 and 168. To pull out between and the bottom chassis 180.

According to the present invention, at one end and the other end of the protrusion 142 corresponding to the lamp holder 170 of the reflecting plate 140, a fastening part 150 into which the lamp holder 170 is fitted is formed. 150 is vertically protruded with respect to the reflector plate 140 so that predetermined portions of the reflector plate 140 face each other, and bent horizontally with respect to the reflector plate 140 so that the ends of the protruding portions face each other to form a "-" shape. do.

Referring to the above-described forming process of the fastening part 150 in more detail, one side end portion and the other end portion of the protrusion 142 is cut by a predetermined length toward the longitudinal direction of the reflecting plate 140 to form a cutting line, and cut The cut point is spaced apart by a predetermined distance toward the width direction of the protrusion 142 to a size corresponding to the first cut line to form another cutting line. Then, after cutting to connect the center of one of the cutting line to the other one of the cutting line, by pushing the cut portion from the lower surface of the reflecting plate 140 toward the diffuser plate 185 to stand vertically, vertically The end portions of the portions are bent horizontally with respect to the reflecting plate 140 to face each other to form a fastening portion 150 having a "-" shape.

Finally, the mold frame 110 will be described as follows.

As shown in FIGS. 1 and 2, the mold frame 110 has a rectangular shape corresponding to the LCD panel 190, and includes a first mold frame 120 having receiving spaces 122 and 124 penetrating from an upper surface to a lower surface. And a second mold frame 130 placed on an upper surface of the first mold frame 120 and having an accommodation space 132 formed on one surface facing the top chassis 195.

The reflective plate 140 and the lamp unit 160 are accommodated in the storage space 122 having a predetermined depth formed on the lower surface side of the first mold frame 120 among the storage spaces 122 and 124 of the first mold frame 120. The diffusion plate 185 is installed in the accommodation space 124 formed on the upper surface side of the first mold frame 120.

Here, when the reflecting plate 140 is accommodated in the storage space 122 of the first mold frame 120, as shown in FIG. 1, the ribs of the first mold frame 120 formed outside the storage space 122 ( The rib 126 is positioned at the edge of the reflector 140 having a height lower than that of the protrusion 142. The female threaded portion 125 is formed at a portion of the ribs corresponding to the female threaded portions of the reflective plate such that the rib 126 and the reflective plate 140 are fixed by the male threaded portion 123.

Meanwhile, according to the present invention, the pressing protrusion 128 protrudes toward the lamp holder 170 by a predetermined length on predetermined portions of both sidewalls of the side wall of the storage space 122 facing the lamp holder 170 so that the reflecting plate 140 is provided. The lamp holder 170 is pressed and fixed together.

Preferably, the predetermined portion where the pressing protrusion 128 is formed on the width sidewall of the storage space 122 may increase the height of the protrusion 142 and the height of the lamp holder 170 on the lower surface of the first mold frame 120. It is formed in a portion spaced apart or slightly lower than the combined distance to press the lamp holder 170 from the top.

Here, as shown in FIG. 3, when the reflecting plate 140 coupled with the lamp unit 160 is fastened to the lower surface of the first mold frame 120, the upper surface of the protrusion 142 as shown in FIG. 2. The lamp holder 170 is positioned between the pressing protrusion 128.

Meanwhile, the LCD panel 190 is accommodated in the storage space 132 formed on the upper surface of the second mold frame 130, and the screen is displayed on the LCD panel 190 on the base surface of the storage space 132. An open area larger than the screen display area, which is a portion, is formed so that light emitted from the diffuser plate 185 is incident on the LCD panel 190.

The assembly process and the lamp replacement operation of the liquid crystal display device according to the present invention configured as described above will be described below.

First, the lamp holder 170 is fitted to one end and the other end of each lamp 162. Then, the lamp holder 170 fitted at one end of the lamp 162, for example, the hot side to which the power is supplied, is positioned outside the fastening part 150 adjacent to the edge 144 of the reflector plate 140 and the lamp ( The lamp holder 162 fitted at the other end of the 162, for example the cold side through which current flows back, is positioned between the fastening portions 150. In this state, the lamp 162 is pushed toward the cold side. Then, the slide slit 176 is slid along the bent portion 156 of the fastening part 150 to engage the lamp holder 170 and the fastening part 150.

By the above-described method, the plurality of lamps 162 are primarily fixed to the upper surface of the reflector plate 140.

Separately, the first mold frame 120 is turned upside down so that the storage space 122 formed on the lower surface side of the first mold frame 120 is exposed to the outside.

Thereafter, the reflective plate 140 to which the plurality of lamps 162 are fixed is installed on the lower surface of the first mold frame 120 by the above-described method. Then, the protrusion 142 of the reflector plate 140 in which the lamps 162 are installed is introduced into the storage space 122, and the edge formed along the outer side of the protrusion 142 is rib of the first mold frame 120. Contact 126. In addition, the lamp holder 170 is positioned between the protrusion 142 and the pressure protrusion 128.

When the reflecting plate 140 is placed on the lower surface of the first mold frame 120, the wire 168 connected to the cold side electrode 164 of the lamp 162 is turned toward the lower surface of the reflecting plate 140 to bead 148. Insert the wire 168 into the bead 148 formed on the hot side of the lamp 162 and the adjacent edge 144 across the protrusion 142 to expose the outside of the reflector plate 140. .

Subsequently, the male screw portions 123 are assembled to the edges of the reflecting plate 140 and the female screw portions 125 and 145 formed on the ribs 126 to fasten the reflecting plate 140 to the lower surface of the first mold frame 120. At this time, since the pressure protrusion 128 is formed to be lower than or equal to the height of the protrusion 142 and the lamp holder 170 combined, the protrusion 142 applies a force toward the diffusion plate 185 to open the lamp holder 170. The lamp holder 170 is completely fixed to the reflector plate 140 because the pressure is applied from the lower side, and the pressing protrusion 128 presses a force toward the reflector plate 140 to press the lamp holder 170 from the upper side.

Therefore, the lamps 162 do not flow even when vibration is generated from the outside.

As described above, when the reflective plate 140 is fastened to the lower surface of the first mold frame 120, the bottom chassis 180 is covered on the lower portion of the first mold frame 120 to be fixed to the first mold frame 120. The diffusion plate 185 is installed in the storage space 124 while the first mold frame 120 is turned upside down so that the storage space 124 formed on the upper surface side of the first mold frame 120 is exposed to the outside.

When the diffusion plate 185 is installed in the storage space 124, the second mold frame 130 is installed on the upper surface of the first mold frame 120, and the storage plate is formed on the upper surface side of the second mold frame 130. An LCD panel 190 for displaying information is provided in the space 132.

Subsequently, the top chassis 195 is covered on the upper portion of the LCD panel 190 to bond the mold frame 110 and the top chassis 195 to each other.

After replacing the bottom chassis 180 from the first mold frame 120 to replace the lamp 162 which is not turned on after driving the assembled liquid crystal display device 100 through the above-described process, the reflective plate After separating the external thread 123 from the 140 and the first mold frame 120, the reflective plate 140 and the first mold frame 120 are separated. Then, the lamp that is not lit is removed from the fastening portion of the reflecting plate 140, and a new lamp is first fixed to the fastening portion 150 of the reflecting plate 140.

Thereafter, the reflective plate 140 and the bottom chassis 180 are coupled to the lower surface of the first mold frame 120 by the above-described method.

When the plurality of lamps 162 are temporarily fixed to the upper surface of the reflector 140 as described above, when the lamps 162 are not fully lit, the entire lamp 162 including the reflector plate 140 may be replaced. Therefore, the replacement of the lamp in the prior art is much advantageous.

In addition, the liquid crystal display 100 according to the present invention, in which a plurality of lamps 162 are primarily fixed to one reflective plate 140, has a process of connecting a plurality of divided reflective plates with an adhesive or a screw as in the related art. Not required. In addition, when the reflective plate 140 to which the lamps 162 are fixed is installed in the first mold frame 120, the pressing protrusion 128 of the first mold frame 120 and the protrusion 142 of the reflecting plate 140 may be used. ) Presses the lamp holder 170 so that the lamps 162 are completely fixed to the reflector plate 140 so that the lamps 162 do not flow, so that a specific mold may not be inserted into the lamp holder 170.

Therefore, as compared with the related art, the assembly process of the liquid crystal display device 100 is simplified and the weight of the liquid crystal display device 100 is also reduced.

As described above, the present invention forms a fastening portion at one side edge of the reflective plate and a predetermined portion of the other edge thereof to fix the plurality of lamps primarily on the upper surface of the reflecting plate, and faces the lamp holder in the storage space in which the reflecting plate is accommodated. The lamp holder is pressed together with the reflecting plate to the predetermined widthwise side wall predetermined portion to form a pressing protrusion for completely fixing the lamps to the reflecting plate.

In this way, when a plurality of lamps are installed in one reflector and the lamps are fixed by using the pressure protrusions of the reflector and the mold frame, the assemblability of the liquid crystal display is improved, and a specific mold is not installed in the lamp holder. Since the number of parts of the lamp unit is reduced, the cost is reduced, and the weight of the liquid crystal display device is reduced.

In addition, when the plurality of lamps fixed to the reflector are not all lit, there is an effect that the workability of the lamp may be improved.

Claims (6)

A mold frame having a receiving space penetrating from an upper surface to a lower surface; A reflection plate installed in a storage space formed at a lower surface side of the mold frame, and having fastening portions formed at predetermined intervals on one side of the width direction and at a predetermined portion of the other end portion; A plurality of lamps installed on the upper surface of the reflecting plate at predetermined intervals from each other and having electrodes formed at one end and the other end to emit light, and fitted to one end and the other end of the lamps, respectively, and coupled to the fastening part A lamp unit including a lamp holder for fixing lamps to an upper surface of the reflecting plate and a power supply electrically connected to the electrode by a wire to supply power to the lamps; A diffusion plate installed on the lamps to diffuse light emitted from the lamps; And An LCD panel installed on the diffusion plate to display information; The predetermined portion of the side wall of the accommodating space opposing the lamp holders of the accommodating space in which the reflector and the lamp unit are accommodated protrudes by a predetermined length toward the lamp holder to press the lamp holder together with the reflector to cause the lamps to The direct type liquid crystal display device, characterized in that the pressing projection is fixed to the upper surface of the reflective plate completely. The method of claim 1, wherein the pressing projection is formed at a point raised slightly lower than the height of the lamp holder toward the diffuser at a point corresponding to the upper surface of the reflecting plate on which the lamp holder is installed in the side wall of the receiving space. Direct liquid crystal display device characterized in that. The method of claim 1, wherein the pressing projection is formed at a point that is raised by the height of the lamp holder toward the diffuser plate at a point corresponding to the upper surface of the reflecting plate on which the lamp holder is installed among the side walls of the storage space. Direct liquid crystal display device. The reflector of claim 1, wherein the fastening part protrudes a predetermined height toward the diffuser plate so that the reflecting plate is opposed to each other at a predetermined portion of the reflecting plate corresponding to the lamp holder, and horizontally with respect to the reflecting plate so as to face each other. The liquid crystal display device of the direct type characterized in that it is bent. The lamp holder of claim 4, wherein the lamp holder is Body; A lamp insertion groove formed on one side of the upper end of the body adjacent to the diffuser plate to face the lamp and fitted to an end of the lamp; The liquid crystal of the direct method characterized in that it is formed in the lower portion of the body spaced apart from the lamp insertion groove corresponding to the bent portion of the fastening portion is formed in the guide slit to be fitted to the fastening portion to secure the lamp holder Display. The method of claim 1, wherein the remaining portion of the wires protrudes toward the diffuser plate along an edge of the reflecting plate, except for a predetermined portion of an edge of the reflecting plate, in order to draw out the wires through which the current flows back out through the lower surface of the reflecting plate. And a bead in which the wire is inserted is formed at an edge of the edge formed on the outer side of the protruding portion facing the pressing protrusion.