KR20010047613A - Liquid crystal display - Google Patents

Abstract

PURPOSE: A liquid crystal display device is to form a ground path by directly contacting a bottom chassis and a top chassis, thereby reducing a manufacturing process and improving a productivity of the device. CONSTITUTION: A mold frame(110) has housings(113,115). A reflective plate(130), a light guide plate(125) for guiding the light and optical sheets(135) for enhancing the luminance of the light are sequentially stacked in the housing. A lamp(120) for irradiating the light is disposed between the side face of the light guide plate and the sidewalls of the housings. A bottom chassis(140) connected to a bottom face of the mold frame supports the reflective plate, the light guide plate and the optical sheets. An LCD panel(150) installed within the housings displays information using the light radiated from the optical sheets. A top chassis(170) for supporting the LCD panel is connected to a top face of the mold frame. The top chassis has an opening(173) whose area is greater than an image displaying region of the LCD panel.

Description

Liquid crystal display

The present invention relates to a liquid crystal display device, and more particularly, to improve the structure of the top chassis so that even if the liquid crystal panel and the top chassis flow, the center of the liquid crystal panel and the center of the top chassis that are coincident with each other are prevented from being distorted. The present invention relates to an improved liquid crystal display device.

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

In order to replace the cathode ray tube, it has advantages such as miniaturization, weight reduction, thinning, and low power consumption, and a liquid crystal display device which displays information by using the electrical and optical properties of the liquid crystal material injected into the liquid crystal panel is actively active. It has been developed, and recently, the function has been improved enough to perform a role as a flat panel display device, and thus it is used not only for a laptop computer but also for a monitor and a large liquid crystal display device of a desktop computer.

Unlike the cathode ray tube, the liquid crystal display device irradiates light to the liquid crystal panel because the liquid crystal material injected between the TFT substrate and the color filter substrate is not a light emitting material that generates light itself but is a light receiving material using light applied from the outside. A separate light source, i.e. a backlight assembly, is necessary.

Since the performance of the backlight assembly has a great influence on the display quality of the liquid crystal display device, the assembly tolerance between the members constituting the backlight assembly including the liquid crystal panel is properly designed, and the flow of each member, in particular, the liquid crystal panel and the top chassis It is important to suppress the flow of maximally so that the center of the screen display area, which is the part where information is displayed in the liquid crystal panel, does not lie on either side.

Looking at the structure of the conventional liquid crystal display device 1, as shown in Figure 1, the lamp 20 for emitting light to the receiving space 13 formed on the lower surface side of the mold frame 10, the light guide plate for guiding the light ( 25, a reflector 30 reflecting light to the light guide plate 20 and optical sheets 35 for increasing the brightness of light guided by the light guide plate 25 are inserted, and a bottom chassis 40 for supporting these members. ) Is fastened to the lower surface of the mold frame 10.

In addition, the guide rib 15 protrudes to a predetermined height on the upper surface of the mold frame 10 in order to suppress the maximum flow of the liquid crystal panel 50 before and after the left and right axes. The liquid crystal panel 50 is installed in the storage space 17 formed on the upper surface of the mold frame 10 due to the guide ribs 15.

On the other hand, the top chassis 70 is fastened to the upper surface of the mold frame 10 to prevent the liquid crystal panel 50 from flowing up and down, and the open region 73 of the top chassis 70 is fastened. The center and the center of the screen display area 53 of the liquid crystal panel 50 coincide exactly.

Here, a fixing member for fixing the mold frame 10 and the top chassis 70 is formed in each of the mold frame 10 and the top chassis 70, the fixing projection 19 is predetermined on the mold frame 10 side. Protruding to form a height, the insertion hole 75 is formed on the top chassis 70 side. Reference numeral 65 is a rubber for protecting the panel.

As described above, the guide rib 15 suppresses the flow of the liquid crystal panel 50 as much as possible, but due to the assembly tolerance between the liquid crystal panel 50 and the mold frame 10, the inner wall of the guide rib 15 and the liquid crystal panel A gap of 0.15 mm is generated between the side surfaces of the side 50, the cutting tolerance of the liquid crystal panel 50 is about ± 0.15 mm, and the distance tolerance between the guide ribs 15 formed in the width direction is about 0.2, -0.1. And a distance tolerance of 0.35 and −0.1 between the guide ribs 15 formed in the longitudinal direction, the liquid crystal panel 50 may flow up to 0.5 to 0.65 mm.

In addition, since a predetermined size gap is generated between the fixing protrusion 19 of the mold frame 10 and the insertion hole 75 of the top chassis 70, the top chassis 70 also flows. When the top chassis 70 flows in a direction facing each other, the center of the liquid crystal panel 50 may be eccentric up to 0.5 to 0.8 mm.

As described above, when the center of the liquid crystal panel 50 and the center of the top chassis 70 are distorted by the flow, information is not displayed in the open area 73 of the top chassis 70 as shown in FIG. 1. Since the distance “L” between the non-display areas 55, which is an area, becomes long, light leakage phenomenon in which light concentrated on the cutting surface a of the liquid crystal panel 50 is visible to a user's eyes is generated, thereby reducing reliability of the product. .

In addition, in order to suppress electromagnetic waves generated by the driving elements of the liquid crystal display device 1, the bottom surface 40 and the top chassis 70 are in contact with the mold frame 10 as illustrated in FIG. 1. There is a problem in that the number of assembling steps of the liquid crystal display device 100 is increased because of the insertion of the magnetic grounding clip 90.

Accordingly, an object of the present invention is to conceive in view of the above problems, to prevent the center of the top chassis and the liquid crystal panel from shifting each other.

Another object of the present invention is to simplify the assembly process of the liquid crystal display device.

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

1 is a cross-sectional view showing a conventional liquid crystal display device structure.

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

Figure 3 is a perspective view schematically showing the back structure of the top chassis according to the present invention.

4 is a cross-sectional view illustrating a structure in which a front case is fastened to a liquid crystal display according to the present invention.

In order to achieve the above object, the present invention forms an open area larger than the screen display area in a portion corresponding to the screen display area of the liquid crystal panel among the top chassis fastened to the upper surface of the mold frame to support the liquid crystal panel. In order to prevent the center of the top chassis and the center of the liquid crystal panel from shifting beyond the allowable range when the top chassis and the liquid crystal panel flow, a guide length is protruded toward the storage space at the inner edge facing the liquid crystal panel. Form.

Hereinafter, the structure of the liquid crystal display according to the present invention will be described with reference to FIGS. 2 to 4.

The liquid crystal display according to the present invention forms a guide outward on the lower surface of the top chassis facing the liquid crystal panel so that the liquid crystal panel flows together with the top chassis by the direction and distance in which the top chassis flows, thereby matching the tops matched with each other. The center of the open area of the chassis and the center of the screen display area of the liquid crystal panel are shifted beyond the allowable range to prevent the screen from biasing.

The liquid crystal display device 100 having such a purpose includes a mold frame 110 having a large storage space as shown in FIG. 2, and lamps 120 that are accommodated in the storage space of the mold frame 110 to emit light. The reflector 130 reflects light, the light guide plate 125 for guiding light, and the optical sheets 135 for increasing the brightness of the light, and a bottom chassis fastened to the lower surface of the mold frame 110 to support them. 140 and the liquid crystal panel 150 accommodated in the storage spaces 113 and 115 of the mold frame 110 and the upper surface of the mold frame 110 to display information to support the liquid crystal panel 150 to support the liquid crystal display device. When the flow is generated by the vibration or impact of the 100, the liquid crystal panel 150 also flows together and consists of a top chassis 170 which prevents the screen from biasing to either side.

Of these, the mold frame 110 has a rectangular shape, and the storage spaces 113 and 115 are formed on the upper and lower surfaces thereof. The reflecting plate 130 is formed inside the storage space 113 formed on the lower surface side of the mold frame 110. The light guide plate 125 and the optical sheets 135 for transmitting the light having increased luminance to the liquid crystal panel 150 are sequentially stacked, and a lamp is disposed between the longitudinal side surface of the light guide plate 125 and the side wall of the storage space 113. Field 120 is installed.

The liquid crystal panel 150 is accommodated in the storage space 115 formed on the upper surface of the mold frame 110, and the screen display area 153 of the liquid crystal panel 150 is provided on the base surface of the storage space 115. A larger open area is formed so that light emitted from the optical sheets 135 is incident on the liquid crystal panel 150.

The bottom chassis 140 is covered from the lower surface of the mold frame 110 to the side of the mold frame 110, and the side chassis of the bottom chassis 140 is in direct contact with the top chassis 170 to ground the electromagnetic waves. The dragon extension part 145 extends by a predetermined length in a direction parallel to the upper surface of the mold frame 110 and opposed to the mold frame 110.

Meanwhile, as shown in FIGS. 2 and 3, the top chassis 170 according to the present invention guides the open area 173 to expose the screen display area 153 to the outside and the liquid crystal panel 150 to guide the liquid crystal panel 150. And a guide extension 180 for limiting the flow of the panel 150 and a ground extension 185 for directly contacting the ground extension 145 of the bottom chassis 140 to ground the electromagnetic wave.

In more detail, the open area 173 is formed on the upper surface of the liquid crystal panel 150, and the screen non-display area 155 is formed outside the screen display area 153 and the screen display area 153. ) Is formed larger than the screen display area 153 so that a predetermined portion can be exposed.

In addition, the guide insert 180 has a predetermined length toward the storage space 115 of the mold frame 110 from the inner edge of the top chassis 170 facing the liquid crystal panel 150 as shown in FIG. 3. As shown in FIG. 2, when the top chassis 170 is fastened to the mold frame 110 as shown in FIG. 2, a guide insert between the inner wall of the storage space 115 and the side surface of the liquid crystal panel 150 ( When the 180 is inserted and the top chassis 170 flows, the guide insert 180 pushes the liquid crystal panel 150 by the same distance in the same direction as the top chassis 170 and the center of the screen display area 153. The centers of the open areas 173 of the top chassis 170 are prevented from being shifted from each other.

Here, the tape carrier package (not shown) for electrically connecting the liquid crystal panel 150 and the printed circuit board (not shown) installed outside the storage space is bonded to the long side and the short side of the liquid crystal panel 150. As shown in FIG. 1, the guide insert 180 is not formed at a portion corresponding to the tape carrier package.

The guide insert 180 may be formed of the same material as the top chassis 170, but when the liquid crystal panel 150 collides with the guide insert 180, the edge portion of the liquid crystal panel 150 may be impacted by an impact. In order to prevent breakage, it is preferable to form a material capable of absorbing shock, for example, the same material as the mold frame 110.

On the other hand, the ground extension 185 extends by a predetermined length in a direction opposite to the mold frame 110 to be parallel to the ground extension 145 of the bottom chassis 140 at the side end of the top chassis 170. do.

The ground extension 185 according to the exemplary embodiment is formed in a “one” shape that is a shape corresponding to the ground extension 150 of the bottom chassis 140.

As described above, when the bottom chassis 140 and the ground extensions 145 and 185 of the top chassis 170 are formed with “1” characters, the LCD unit 100 is assembled using a screw (not shown). When combined with the 200 (see FIG. 4), deformations such as the bottom chassis 140 and the top chassis 170 which are thin due to the fastening pressure of the screw may be distorted or bent.

Another embodiment of the extension portion 185 for the ground is to solve this problem, as shown in Figure 2 is an "C" shape formed so that the opening facing the side of the mold frame 110. When the shape of the ground extension 185 is described in more detail, the ground is extended in parallel with the ground extension 145 in the direction opposite to the mold frame 110 at the side end of the top chassis 170. It is formed by bending toward the bottom chassis 140 to be perpendicular to the extension part 145 and then to the mold frame 110 so as to be parallel to the extension part 145 for ground.

The ground extension part of the top chassis 170 and the bottom chassis 140 when the liquid crystal display device 100 and the front case 120 are fastened to the inner space of the ground extension part 185 formed in a “c” shape. A reinforcing member 183 is inserted to reinforce the strength of the 145 and 185.

Preferably, the reinforcing member 183 is formed of the same material as the guide insert 180 and inserted into the ground extension 185 in the same process as the guide insert 180.

As shown in FIG. 3, the ground extension 185 includes a user hole and a top chassis 170 for fixing the case 200 and the liquid crystal display device 100, the mold frame 110, and the bottom chassis 140. It is formed only at both ends of the short side of the top chassis 171 is formed with a female thread for fastening the ground extension portion 145 of the ().

According to the present invention, the center of the front case and the center of the liquid crystal panel and the top chassis when the front case is coupled to the liquid crystal display device to use the liquid crystal display device configured as described above and the liquid crystal display device as a monitor of another facility. It is easy to align, and if vibration or shock is applied from the outside after the front case is coupled to the liquid crystal display, the front case can be moved with the top chassis in the same direction in the same direction so that the top surface of the ground extension of the top chassis can be moved. A guide boss is formed.

This will be described in more detail with reference to FIG. 4. As described above, the center of the top chassis 170 and the center of the front case 200 are easily formed at a predetermined portion of the ground extension 185 of the top chassis 170. The guide boss 187 for preventing the center of the top chassis 170 and the center of the front case 200 from being shifted beyond the allowable range by protruding and protruding to a predetermined height.

As shown in FIG. 4, the front case 200 fastened to the liquid crystal display device 100 has a screen display area 153 of the liquid crystal panel 150 at a portion corresponding to the open area 173 of the top chassis 170. An open area 203 is formed to expose the opening, and a guide hole 207 into which the guide boss 187 is inserted is formed at a portion of the inner surface facing the top chassis 170 and corresponding to the guide boss 187. Is formed. Preferably, the guide boss 187 is formed of the same material as the guide insert 180.

The assembly process and operation of the liquid crystal display and the front case configured as described above are as follows.

As shown in FIG. 2, first, the optical sheets 135, the light guide plate 125, and the reflector 130 are sequentially turned in a state in which the mold frame 110 is turned upside so that the storage space 113 of the mold frame 11 is exposed. The lamp 120 is stacked as described above, and a lamp 120 that emits light is provided between the side wall of the storage space 113 and the side surface in the longitudinal direction of the light guide plate 125.

Thereafter, the bottom chassis 140 is fastened to the lower surface of the mold frame 110 so that the reflective plate 130, the lamp 120, the light guide plate 125, and the optical sheets 135 may be supported, thereby accommodating the storage space 113. To close.

Subsequently, the liquid crystal panel 150 of the storage space 115 is installed while the mold frame 110 is turned upside down so that the storage space 115 is exposed. Here, when the liquid crystal panel 150 is installed in the storage space 115, a predetermined length is formed between the sidewall of the storage space 115 and the side surface of the liquid crystal panel 150 due to the assembly tolerance between the mold frame 110 and the liquid crystal panel 150. Gap is generated.

Subsequently, in order to support the liquid crystal panel 150 accommodated in the storage space 115, the top chassis 170 is fastened to the upper portion of the liquid crystal panel 150. In this case, the screen display area 153 of the liquid crystal panel 150 is fastened. The top chassis 170 is fixed to the mold frame 110 by aligning the center of the screen display area 153 of the liquid crystal panel 150 with the center of the open area 173 of the top chassis 170 so as not to be biased to one side. . Then, the guide insert 180 is inserted into the gap generated between the storage space 115 and the liquid crystal panel 150, and the ground extension 185 of the top chassis 170 is the bottom chassis 140. Is directly contacted with the ground extension 145 of the ground path.

When the assembly of the liquid crystal display device 100 is completed through the above process, the front case 200 is fastened to the upper surface of the liquid crystal display device 100 as shown in FIG. The guide holes 207 and the guide bosses 187 to align the guide holes 207 in the guide bosses 187 to open areas 203 and 173 of the front case 200 and the top chassis 170. The center is easily aligned.

After assembling the liquid crystal display device 100 through the above process, covering the front case 200 on the upper portion of the liquid crystal display device 100, and then performing a reliability test to apply shock or vibration from the outside, the respective members are assembled to tolerance. It easily flows due to vibration or shock.

In this case, when the liquid crystal panel 150, the top chassis 170, and the front case 200 flow by vibration, the liquid crystal panel 150 and the front case 200 may be moved by the top chassis 150. The distance is limited.

That is, when the top chassis 170 flows, the guide out 180 and the guide boss 180 formed integrally with the top chassis 170 also flow together. Since the side surface of the liquid crystal panel 150 is pushed by the distance flowed in the direction in which 170 flows, the center of the screen display area 153 flows along the center of the open area 173.

In addition, the guide boss 187 also pushes the front case 200 by a distance flowed in the direction in which the top chassis 170 flows in the same manner as the guide insert 180, thereby moving the center of the open area 173. Accordingly, the center of the open area 203 of the front case 200 also flows.

As described above, the liquid crystal panel 150 and the front case 200 are topped according to the flow of the top chassis 170 while the centers of the top chassis 170, the liquid crystal panel 150, and the front case 200 coincide with each other. Since the chassis 170 moves together with the chassis 170, the centers of the open areas 173 and 203 and the center of the screen display area 153 do not shift beyond the allowable range.

Therefore, the distance "L" from the open area 173 of the top chassis 170 shown in FIG. 2 to the end portion of the non-display area 155 of the liquid crystal panel 150 is always kept constant so that the liquid crystal panel 150 Since light concentrated at the corners of the top panel is blocked by the top chassis 170 and the front case 200, light leakage does not occur.

As described above, the present invention forms a guide outer restricting the flow of the liquid crystal panel inside the top chassis facing the liquid crystal panel, and guides the boss for the guide in a predetermined area of the upper surface of the top chassis facing the front case. When the top chassis, the liquid crystal panel, and the front case are moved by vibrations applied from the outside of the liquid crystal display, the center of the open area of the top chassis and the front case and the center of the screen display area of the liquid crystal panel are shifted beyond the allowable range. By preventing the appearance quality of the product is improved.

In addition, by forming a ground extension on the side of the top chassis and the side of the bottom chassis to form a ground path by directly contacting the bottom chassis and the top chassis, the number of steps for assembling the liquid crystal display device can be reduced, thereby improving product productivity. have.

Claims (9)

A mold frame in which a storage space is formed; A reflection plate, a light guide plate, and an optical sheet stacked in the storage space in order to guide light and increase brightness of the light; A lamp disposed between a side of the light guide plate and a side wall of the accommodation space to emit light; A bottom chassis fastened to a lower surface of the mold frame to support the reflector, the light guide plate, the optical sheets, and the lamp; A liquid crystal panel installed inside the storage space and displaying information using light transmitted from the optical sheets; And It is fastened to the upper surface of the mold frame to support the liquid crystal panel, an open area larger than the screen display area is formed in a portion corresponding to the screen display area of the liquid crystal panel, the inner edge of the inner surface facing the liquid crystal panel The liquid crystal display device, characterized in that it comprises a top chassis formed with an insert. The guide insert of claim 1, wherein the outer portion of the guide is formed to protrude toward the receiving space by a predetermined length. The outer portion guides the liquid crystal panel when the top chassis and the liquid crystal panel are moved, and the center of the screen display area. A liquid crystal display device which prevents the center of the open area from shifting beyond the allowable range. The top chassis of claim 2, wherein when the top chassis is fastened to the mold frame, the guide insert is inserted between the side wall of the storage space and the liquid crystal panel so that the top chassis flows when the top chassis flows. The liquid crystal display device, characterized in that for flowing the same distance in the same direction. The liquid crystal display of claim 2, wherein the guide insert is formed of a material capable of absorbing shock to prevent the liquid crystal panel from being damaged. The liquid crystal display device as claimed in claim 1, wherein the outlet is a ground extension part and is horizontally extended in a direction opposite to the mold frame from a side surface of the top chassis to be in contact with the bottom chassis. 6. The ground chassis of claim 5, wherein a ground extension is formed on the side upper end of the bottom chassis facing the ground extension so as to be parallel to the ground extension, and the ground extension of the top chassis and the ground of the bottom chassis. And an extension for direct contact to form a ground path. 7. The liquid crystal display device according to claim 6, wherein the ground and extension portions of the top chassis and the bottom chassis are "one" shaped. The grounding extension of the top chassis has a shape of "c" having one side open, and the grounding extension of the top chassis and the bottom chassis of the top chassis are deformed in the opening of the grounding extension of the top chassis. Liquid crystal display device characterized in that the reinforcing member is inserted to prevent. According to claim 1, wherein the upper surface of the top chassis exposed to the outside guides the front case is covered on the upper surface of the top chassis, the center of the open area of the top chassis and the center of the open area of the front case flows. The guide boss for preventing the deviation due to the liquid crystal display device characterized in that it is further formed.