KR100555885B1 - Direct lighting type of liquid crystal display - Google Patents

Abstract

In the direct type liquid crystal display, the lamp assembly is divided into at least two lamps and installed on the lower surface of the diffusion plate, and a slice slot is formed at a position corresponding to the lamp assembly on the side of the bottom chassis to fix the lamp that is not lit. Easily take out the assembly out of the LCD and replace the lamp.

Therefore, it is possible to reduce the lamp replacement time, improve workability, and prevent the failure of the driving unit due to the replacement of the lamp assembly.

Description

Direct lighting type of liquid crystal display}

1 is an exploded perspective view schematically showing a liquid crystal display device of a direct type according to the present invention;

2 is a longitudinal cross-sectional view taken along the line I-I of FIG. 1,

3 is an enlarged view illustrating a portion A of FIG. 2 in an enlarged manner.

Figure 4 is an exploded perspective view showing a lamp assembly according to the present invention,

5 is a perspective view illustrating the ground wire of the lamp.

The present invention relates to a direct type liquid crystal display device, and more particularly, in order to easily replace the lamp assembly installed on the lower surface of the diffuser plate, at least two or more lamps are manufactured in a set to slide the lamp assembly in a sliding manner. It relates to a liquid crystal display device of the direct type replaced.

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

In order to replace the CRT, a liquid crystal display device having advantages of 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, as the monitor and the large information display device of the desktop computer is used, the demand for the liquid crystal display device is continuously increasing.

Since the liquid crystal display is a light receiving device that displays an image by controlling the amount of light coming from the outside, a separate light source, that is, a backlight assembly, for irradiating light to the LCD panel is necessary.

The backlight assembly includes a mold frame in which a storage space is largely formed, a reflector plate, a light guide plate, optical sheets, and a lamp assembly that are sequentially stacked in the storage space, and a bottom chassis and a top chassis that support the members and are coupled to the mold frame. According to the position of the lamp assembly, the backlight assembly is divided into an edge method and a direct method.

The edge method is to install the lamp assembly on the side of the light guide plate that guides the light toward the LCD panel. The lamp assembly surrounds the lamp that emits light, the lamp holder inserted at both ends of the lamp to protect the lamp, and the outer circumferential surface of the lamp. It consists of a lamp cover that reflects the light emitted from the lamp toward the light guide plate.

The edge type backlight assembly is mainly applied to a relatively small liquid crystal display device such as a laptop computer and a desktop computer monitor, and has good light uniformity, long durability, and thinning of the liquid crystal display device. It is advantageous.

On the other hand, the direct method is a lamp assembly is installed on the lower surface of the diffusion plate for diffusing light, the lamp assembly is a lamp holder formed with a plurality of semi-circular grooves in the width direction of the optical sheet, and the semi-circular grooves to receive light It consists of a plurality of lamps emitting. Therefore, in the direct method, since a plurality of lamps are arranged on the lower surface of the diffusion plate, a light guide plate for guiding light toward the LCD panel is not used.

Such a direct type backlight assembly is mainly used for a large screen liquid crystal display device, which is easier to mass-produce, and has a higher luminance than an edge type method.

However, in such a direct method, since a plurality of lamps are installed on the lower surface of the diffusion plate, lamps that do not turn on due to failure and life of the lamp are more likely to appear than edge methods.

In addition, due to the life and failure of the lamp in the edge method in which the lamp assembly is installed on both sides of the light guide plate, for example, when one lamp is not lit, 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, only the part where the lamp does not light becomes dark because the lamp is not lit. Appears immediately on the image.

For the reasons described above, lamps must be replaced frequently in direct backlight assemblies.

However, to replace the lamp that is not lit, separate the top chassis, the mold frame, the mold frame and the bottom chassis surrounding the lamp assembly, separate the drive unit and the reflector stacked on the bottom of the lamp assembly, and remove the lamp that is not lit. Since the lamp holder needs to be removed from the lamp holder and replaced with a new lamp, it takes a lot of time to replace the lamp and reduces workability.

In addition, when the lamp is frequently replaced, a failure is likely to occur in the driving unit installed between the reflective sheet and the bottom chassis to drive the liquid crystal display, thereby deteriorating the reliability of the liquid crystal display.

Accordingly, an object of the present invention has been made in view of the above problems, in the liquid crystal display device adopting the direct method is to easily replace the lamp that does not turn on without disassembling the top chassis, mold frame and bottom chassis lamp To reduce the replacement time and improve workability.

Another object of the present invention is to prevent failure of the drive unit when replacing the lamp.

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

In order to achieve the above object, the present invention inserts a lamp holder and lamp holders which are inserted at both ends of the plurality of lamps and lamps arranged along the longitudinal direction of the diffuser plate at the lower part of the diffuser plate to protect the lamps, The lamp assembly consists of a lamp support and a wire for supplying power to the lamp, a reflector is installed at the bottom of the lamp assembly, and a bottom chassis is installed at the bottom of the mold frame to fasten the mold chassis. A slide slot is formed in the area so that the lamp assembly can be easily taken out, and a side cover for closing the slide slot is fastened to the side of the bottom chassis.

Preferably, each lamp support provided at both ends of the lamp is divided into at least two and arranged in a line along the longitudinal direction of the diffusion plate, and at least two lamps are fixed to one lamp support.

Preferably, a portion of the reflector that corresponds to the lamp is formed flat and a portion that does not correspond to the lamps extends from the flat portion at an angle toward the lamp support, and is formed on the upper surface of the reflector that is opposite to the lamp supports. Reflective material is applied.

In addition, the reflecting plate is divided into several pieces so as to have a width slightly larger than the length of each of the lamp supports are installed along the longitudinal direction of the diffuser plate.

Hereinafter, the backlight assembly of the direct method according to the present invention will be described with reference to FIGS. 1 to 5.

As shown in FIGS. 1 and 2, the liquid crystal display device 100 according to the present invention includes a mold frame 110 having a receiving space 112 through which upper and lower surfaces penetrate, and a lower portion of the mold frame 110. The optical sheets 120 and the diffuser plate 125 which are stacked in order from the base surface of the storage space 112 formed in the diffuser and improve the brightness of the light, and are installed under the diffuser plate 125 to provide light. At least one lamp assembly 130 that emits light, at least one reflector plate 150 disposed below the lamp assembly 130 to reflect light emitted from the lamp assembly 130 toward the diffuser plate 125, and The bottom chassis 160, which is covered under the reflective plate 150, is coupled to the mold frame 110 and supports the respective members, and is coupled to the side surface of the bottom chassis 160, so that the lamp assembly 130 is connected to the liquid crystal display device. Consisting of a side cover 170 for easy removal to the outside of 100). . Reference numeral 180 is an LCD panel which displays information using an electro-optic property.

The lamp assembly 130 according to the present invention includes a plurality of lamps 132 emitting light as shown in FIG. 1 or 4, and lamps fitted to both ends of each lamp 132 to protect the lamp 132. Holders 134, a lamp support 140 for inserting the lamp holders 134 to support the respective lamps 132, and electrically connected to the lamps 132 so that the lamps 132 have a high frequency. It consists of a wire 135 for applying a signal.

As shown in FIG. 4, one end of each lamp 132 protrudes to form a hot electrode 131a through which a high frequency signal is input, and the other end of each lamp 132 includes a ground electrode 131b through which the input high frequency signal is output. It protrudes to a predetermined length.

Here, the lamp 132 is installed in the width direction of the diffusion plate 125, as shown in Figure 1, a plurality of lamps 132 are spaced apart from each other by a predetermined distance in a line along the longitudinal direction of the diffusion plate 125 Is arranged.

In addition, the lamp support 140 is formed in a rectangular shape having the same shape as the lamp holder 134, the insertion hole 142 is formed through the side facing the end of the lamp 132, the lamp holder 134 is fitted In one lamp support 140, at least two or more insertion holes 142 are formed to be spaced apart from each other by a predetermined interval.

Preferably, the width direction length of the lamp support 140 is the same as or slightly larger than the width direction length of the lamp holder 134 so that the lamp supports 140 exist only at predetermined portions of both ends of the lamp 132.

According to the present invention, each lamp support 140 installed at both ends of the lamps 132 is not integrally formed but several shorter than the long side length of the diffusion plate 125 as shown in FIG. The lamp supports 140 are arranged in a line along the longitudinal direction of the diffuser plate 125, and two to three lamps 132 are inserted into one lamp support 140.

As such, the reason for installing a plurality of lamp supports 140 having a length shorter than the long side length of the diffusion plate 125 without integrally forming the lamp supports 140 is because a plurality of lamp holders 140 are fixed to the lamp supports 140. When one of the lamps 132 is not turned on, only the lamp assembly 130 in which the lamp 132 which is not turned on is present to replace the lamp 132 by taking the lamp assembly 130 out of the liquid crystal display device 100.

As described above, the lamp support 140 is integrally formed to have the same length as that of the long side of the diffuser plate 125 without separating each lamp support 140 fitted into both ends of the lamp 132. Thus, each end of the lamps 132 may be inserted into one lamp support 140.

As shown in FIG. 1 or 5, the wire 135 has a hot wire 136 connected to the hot electrode 131a to apply a high frequency signal to the lamp 132, and the other end of the wire 135 to the ground electrode 131b. The ground wire 137 is connected, one ground wire 137 is a ground electrode formed on each of the two to three lamps 132 fixed to one lamp support 140 as shown in FIG. All are connected with 131b.

The reason for tying the ground electrode 131b of the lamps 132 to one ground wire installed in one lamp support 140 as described above is that an inverter (that is connected to the other end of the hot wire 136 and the ground wire 137) ( (Not shown) usually only one ground terminal is formed.

As shown in FIGS. 1 to 3, the reflecting plate 150 according to the present invention has a flat portion corresponding to the lamps 132, and a portion not corresponding to the lamps 132 has a flat surface. The lamp support 140 extends at a predetermined angle toward the lamp support 140, and a reflective material is coated on the upper surface of the reflector 150 facing the lamp supports 140.

Preferably, the reflector plate 150 positioned between the lamps 132 is bent in a trapezoidal shape to diffusely reflect the light emitted from the lamp 132 in various directions, so that the part that does not correspond to the part corresponding to the lamp 132 may be formed. The light brightness is equally adjusted, and the predetermined angle is 45 degrees.

In order to prevent the loss of light by reducing the thickness of the liquid crystal display device 100 and reducing the gap between the lamp 132 and the reflector 150 when the reflecting plate having the flat portion 150a and the inclined portion 150b is repeatedly formed as described above. The lower surfaces of the lamp supports 140 in contact with the reflector 150 are formed in a shape corresponding to the reflector 150.

That is, a trapezoidal groove is formed in a portion of the lower surfaces of the lamp supports 140 that corresponds to the inclined portion 150b of the reflecting plate 150.

In addition, according to the present invention, rather than installing only one reflector plate 150 having the same size as the diffusion plate 125 in the lower portion of each lamp assembly 130, the width slightly longer than the length of each lamp support 140 A plurality of reflecting plates 150 are installed in the longitudinal direction of the diffuser plate 125 to match the size of the diffuser plate 125 and the size of the reflector plate 125.

Meanwhile, according to the present invention, the lower portions of the lamp supports 140 to make each of the lamp assemblies 130 and the respective reflecting plates 150 divided into a plurality due to the lamp supports 140 into one set. The surface and the top surface of the reflecting plates 150 are attached with an adhesive 145, for example double sided tape.

As such, when the lamp assemblies 130 and the reflecting plates 150 are formed in one set, the lamp plates 130 may not be separated from the lamp assemblies 130 when the lamp 132 is replaced. And, it is easy to connect the reflecting plate 150 which is separated into several.

On the other hand, when each of the reflecting plate 150 is installed on the lower surface of each lamp assembly 130 as shown in Figure 3 overlap the boundary portion of each of the reflecting plate 150, the fixing member is in the overlapping portion Installed to couple the respective reflecting plates 150 to each other, while grounding the leakage current from the lamps 132 toward the reflecting plate 150.

Preferably, the fixing member is a grounding screw 155 or a conductive tape (not shown) as shown in FIG. 3, and when the grounding screw 155 is used, the two reflecting plates 150 may be connected to each other. In addition, the lamp support 140 and the reflector 150 may be combined together, and when the lamp 132 is replaced, the work of the reflector 150 may be easily removed and assembled. Preferably, the grounding screw 155 is installed only at both ends of the reflector plate 150.

In addition, in order to facilitate the replacement of the lamp 132, the adhesive 145 for adhering the lamp supports 140 and the reflector plates 150 may not be attached to the part where the ground screw 155 is fastened. It is preferable not to.

Preferably, the flat portion 150a and the inclined portion 150b may be repeatedly formed without forming the reflecting plate 150. In this case, the lower surfaces of the lamp supports 140 may be formed by the reflecting plate ( It is formed flat to form a shape corresponding to 150).

Meanwhile, the bottom chassis facing the lamp supports 140 as shown in FIG. 1 in order to easily take out the lamp assemblies 130 to the outside of the liquid crystal display 100 after each member is assembled. Slide slots 165 are formed on both side surfaces of the width direction 160, and the slide slots 165 are formed at portions corresponding to positions where the lamp assemblies 130 and the reflecting plates 150 are installed.

In addition, the side cover 170 is fastened to both side surfaces in the width direction of the bottom chassis 160 in which the slide slots 165 are formed to close the slide slots 165.

The assembly of the liquid crystal display device and the lamp assembly or lamp replacement operation will be described as follows.

As shown in FIG. 1, the optical sheets 120 and the diffuser plate 125 are sequentially stacked from the base surface of the storage space 112 formed under the mold frame 100.

Apart from this, the lamp holder 134 is fitted to both ends of the lamps 132, and both ends of the lamps 132 into which the lamp holder 134 is fitted are fixed to the respective lamp supports 140. ). At this time, two to three lamps 132 are fixed to one lamp support 140.

The lamp assemblies 130 separated by the lamp supports 140 are arranged in a line along the length direction of the bottom surface of the diffuser plate 125.

Subsequently, an adhesive 145, for example a double-sided tape, is attached to the entire lower surface of the lamp supports 140 except for the boundary of the lamp supports 140, and then the lamp supports to which the double-sided tape 145 is attached ( The reflector plates 150 corresponding to the lamp supports 140 are stacked on the lower surface of the 140 to bond the lamp supports 140 to the reflector plates 150.

Subsequently, each of the reflecting plates 150 is fixed to each other by fastening a fixing member, for example, a grounding screw 155 to the boundary portion of the reflecting plates 150, and the respective reflecting plates 150 and the lamp supporter. Fasten the 140 to each other.

As such, when the members, that is, the optical sheets 120, the diffuser plate 125, the lamp assemblies 130, and the reflecting plates 150 are sequentially stacked on the lower surface of the mold frame 110, the respective members may be formed. In order to support and protect the bottom chassis 160 from the bottom surface of the reflector plate 150 and coupled to the mold frame 110.

Then, the side cover 170 is fastened to both side surfaces of the bottom chassis 160 in the width direction to close the slide slot 165.

Thereafter, the LCD panel 180 is installed on the upper surface of the mold frame 110, the top chassis (not shown) is covered on the upper surface of the LCD panel 180, and then the LCD panel 180 is coupled to the top chassis and the mold frame 110.

In order to replace the lamp 132 that is not turned on after driving the assembled liquid crystal display device 100 through the above-described process, first, the side covers 170 installed on both side surfaces of the bottom chassis 160 in the width direction are replaced. The slide slot 165 is opened by separating it from the bottom chassis 160.

Subsequently, one end and the other end of the lamp assemblies 130 and the reflecting plates 150 connected to each other are removed toward the slide slot 165 to dismantle the grounding screws 155.

Subsequently, only the lamp assembly 130 to which the lamp 132 which is not turned on among the plurality of lamp assemblies 130 is fixed is pulled out of the liquid crystal display device 100 through the slide slot 165 and then is not turned on. Replace the lamp 132 with a new lamp 132.

Thereafter, the lamp assembly 130 is introduced into the liquid crystal display 100 in the reverse order when the lamp assembly 130 is taken out of the liquid crystal display 100, and then the slide slot 165 is formed by the side cover 170. ).

As described above, the present invention divides the lamp assembly into at least two lamp assemblies and installs them on the lower surface of the diffuser plate in the direct type backlight assembly, and forms slice slots at positions corresponding to the lamp assemblies among the side surfaces of the bottom chassis. Only the lamp assembly to which the lamp which is not lit is fixed can be easily taken out of the LCD to replace the lamp.

Therefore, the lamp replacement time is reduced, workability is improved, there is an effect that can prevent the failure in the drive unit due to the replacement of the lamp assembly.

Claims (10)

A mold frame in which a storage space is formed so that the upper and lower surfaces thereof pass; An LCD panel placed on an upper surface of the mold frame to display information; Optical sheets installed on a lower surface of the LCD panel to increase brightness of light; A diffuser plate disposed under the optical sheets to diffuse light; A lamp assembly installed under the diffusion plate to emit light; A reflection plate installed at a lower portion of the lamp assembly to reflect light toward the diffusion plate; A bottom chassis installed below the mold frame to support the optical sheets, the diffusion plate, the lamp assembly, and the reflector, and a slide slot formed at a predetermined side surface to take out the lamp assembly to the outside; A side cover for closing the slide slot; The lamp assembly Lamps arranged in a line along the longitudinal direction of the diffusion plate, each having a hot electrode formed at one end thereof and a ground electrode formed at the other end thereof to emit light; Lamp holders installed at both ends of the lamps to protect the lamps; A lamp support having a plurality of insertion holes corresponding to the number of the lamps formed on a side surface of the at least two lamps, the lamp holder being inserted into the insertion holes to fix the lamps; A hot wire for applying power connected to the hot electrode; The liquid crystal display device of the direct type, characterized in that consisting of a ground wire connected to the ground electrode. The liquid crystal display of claim 1, wherein at least two lamp holders installed at each end of the lamps are arranged in a line along a length direction of the diffusion plate. delete The lamp of claim 1, wherein a portion corresponding to the lamps of the reflecting plate is formed flat, and a portion not corresponding to the lamps extends from the flat portion at an angle toward the lamp supporter. The liquid crystal display of the direct type, characterized in that the reflective material is coated on the upper surface of the reflecting plate facing the support. The LCD of claim 4, wherein a lower surface of the lamp supporter facing the reflector is formed in a shape corresponding to the reflector. The liquid crystal display device according to claim 2 or 4, wherein the reflecting plate is divided into several pieces so as to have a width slightly larger than the length of each of the lamp supports and installed along the longitudinal direction of the diffusion plate. . The liquid crystal display of claim 6, wherein the lamp supports and the reflecting plates are bonded by an adhesive. The direct method of claim 6, wherein the boundary portions of the reflecting plates overlap each other, and the fixing portion is provided at the overlapping portion to couple the reflecting plates to each other and to ground the current leaked from the lamp toward the reflecting plate. LCD display device. The liquid crystal display of claim 8, wherein the fixing member is a grounding screw fastened to both ends of the reflecting plates in the longitudinal direction. The direct type liquid crystal display of claim 1, wherein the slide slot is formed at a position corresponding to the lamp assembly and the reflecting plate on both side surfaces of the bottom chassis facing the lamp supports.

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