KR20070051990A - Liquid crystal display apparatus - Google Patents

Abstract

Disclosed is a liquid crystal display device that simplifies the assembly process, reduces the number of parts, and prevents the inflow of foreign substances to improve display quality. The liquid crystal display device includes a bottom chassis, a backlight unit, a mold frame, a liquid crystal display panel, and a top chassis. The backlight unit is accommodated in the bottom chassis to generate light. The mold frame is coupled to the bottom chassis to fix the backlight unit, and a first fastening groove is formed on the upper surface. The liquid crystal display panel is mounted on the mold frame and displays an image by using light from the backlight unit. The top chassis is coupled to the mold frame to fix the liquid crystal display panel, and a first protrusion is inserted into the first fastening groove. Therefore, the assembly process can be simplified and the number of parts can be reduced, and the inflow of foreign substances can be prevented to improve the display quality of the liquid crystal display.

Description

Liquid crystal display device {LIQUID CRYSTAL DISPLAY APPARATUS}

1 is an exploded perspective view illustrating a liquid crystal display according to an exemplary embodiment of the present invention.

FIG. 2 is a cross-sectional view of the liquid crystal display taken along the line II ′ of FIG. 1.

3 is an exploded perspective view illustrating a coupling relationship between a control printed circuit board and a bottom chassis illustrated in FIG. 1.

4 is a cross-sectional view of the control printed circuit board and the bottom chassis shown in FIG.

FIG. 5 is an exploded perspective view illustrating a coupling relationship between an inverter printed circuit board and a bottom chassis illustrated in FIG. 1.

Explanation of symbols on the main parts of the drawings

100: backlight unit 200: liquid crystal display panel

300: mold frame 320: first fastening groove

400: top chassis 410: first protrusion

500: bottom chassis 530: second fastening groove

540: third fastening groove 600: control printed circuit board

610: first shield case 612: second projection

710: second shield case 712: third protrusion

1000: liquid crystal display

The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device that can simplify the assembly process, reduce the number of parts, and at the same time prevent foreign material from entering.

In general, various electronic devices such as a mobile communication terminal, a digital camera, a notebook computer, a monitor, and a TV are provided with an image display device for displaying an image. Various kinds of image display apparatuses may be used, but a flat panel display apparatus having a flat plate shape is mainly used due to the characteristics of an electronic device, and a liquid crystal display (LCD) is particularly widely used among flat panel display apparatuses.

Such a liquid crystal display device is one of flat panel display devices that display an image using liquid crystal, and is thinner and lighter than other flat panel display devices, and has an advantage of low driving voltage and low power consumption. Widely used throughout.

The liquid crystal display device is combined with a bottom chassis, a backlight unit that is housed inside the bottom chassis to generate light, a liquid crystal display panel that displays an image using light, and a mold frame and a mold frame fixing the backlight unit by combining with the bottom chassis. A top chassis fixing the liquid crystal display panel.

The mold frame is coupled to the bottom chassis to fix the backlight unit, and the liquid crystal display panel is mounted on the mold frame. In addition, the top chassis is coupled to the mold frame to fix the liquid crystal display panel. That is, the liquid crystal display panel is fixed by the combination of the mold frame and the top chassis to prevent flow.

Meanwhile, the top chassis and the mold frame are fastened by using a screw. That is, a fastening hole is formed in each of the mold frame and the top chassis, and a screw is inserted into the fastening hole to couple the mold frame and the top chassis.

As such, when the top chassis and the mold frame are fastened using the screw, not only a considerable time is consumed in the assembling process but also a problem of using a separate component such as a screw occurs. In addition, by forming a hole in each of the mold frame and the top chassis, foreign matter flows through the hole, causing a problem of deterioration of display quality.

Accordingly, the present invention has been made in view of such a conventional problem, and the present invention provides a liquid crystal display device which can simplify the assembly process, reduce the number of parts, and at the same time prevent foreign matter from entering.

A liquid crystal display device according to an aspect of the present invention described above includes a bottom chassis, a backlight unit, a mold frame, a liquid crystal display panel, and a top chassis. The bottom chassis has a space for accommodating, and the backlight unit is accommodated in the bottom chassis to generate light. The mold frame is coupled to the bottom chassis to fix the backlight unit, and a first fastening groove is formed on an upper surface thereof. The liquid crystal display panel is mounted on the mold frame, and displays an image by using light from the backlight unit. The top chassis is coupled to the mold frame to fix the liquid crystal display panel, and a first protrusion is inserted into the first fastening groove.

The first protrusion has a spherical shape, and the first fastening groove has a spherical shape corresponding to the first protrusion. The first protrusion may be formed of a plurality of spaced apart at predetermined intervals, and the first fastening groove may be formed of a plurality of first protrusions corresponding to the first protrusion.

The liquid crystal display according to an aspect of the present invention further includes a control printed circuit board and a first shield case. The control printed circuit board is disposed on the bottom of the bottom chassis to generate a control signal for controlling the driving of the liquid crystal display panel. The first shield case covers the control printed circuit board.

The first shield case includes a second protrusion having a spherical shape, and the bottom chassis includes a second fastening groove having a spherical shape that is coupled to the second protrusion.

The liquid crystal display according to an aspect of the present invention further includes an inverter printed circuit board and a second shield case. The inverter printed circuit board is disposed on a rear surface of the bottom chassis to generate a driving signal for driving the backlight unit. The second shield case covers the inverter printed circuit board.

The second shield case includes a third protrusion having a spherical shape, and the bottom chassis includes a third fastening groove having a spherical shape that is coupled to the third protrusion.

According to the liquid crystal display device, the assembly process may be simplified and the number of separate parts may be reduced by combining the fastening groove and the fastening protrusion. In addition, the top chassis and the mold frame may be closely coupled to each other by coupling the fastening groove and the protrusion to reduce foreign material inflow.

Hereinafter, with reference to the accompanying drawings, it will be described in detail a preferred embodiment of the present invention.

1 is an exploded perspective view illustrating a liquid crystal display device according to an exemplary embodiment of the present invention, and FIG. 2 is a cross-sectional view of the liquid crystal display device taken along the line II ′ of FIG. 1.

1 and 2, the liquid crystal display 1000 may include a bottom chassis 500, a backlight unit 100, a liquid crystal display panel 200, a mold frame 300, and a top chassis 400. In addition, the liquid crystal display 1000 may further include a control printed circuit board 600, an inverter printed circuit board 700, and shield cases 610 and 710 covering them.

The backlight unit 100 is accommodated in the bottom chassis 500 to generate light. The liquid crystal display panel 200 is mounted on the mold frame 300 and displays an image by using light from the backlight unit 100. The mold frame 300 is coupled to the bottom chassis 500 to fix the backlight unit 100. The first fastening groove 320 is formed on the upper surface of the mold frame 300. The top chassis 400 is coupled to the mold frame 300 to fix the liquid crystal display panel 200. The first chassis 410 is formed in the top chassis 400 to be fitted into the first fastening groove 320. The control printed circuit board 600 and the inverter printed circuit board 700 are disposed on the rear surface of the bottom chassis 500.

The control printed circuit board 600 outputs a control signal for controlling the driving of the liquid crystal display panel 200 in response to various electrical signals supplied from an external main board (not shown). The first shield case 610 protects the control printed circuit board 600 from external impact.

The inverter printed circuit board 700 boosts a low potential AC power applied from the outside to a high potential AC power suitable for driving the lamps 112 and outputs driving power. The second shield case 710 protects the inverter printed circuit board 700 from external impact and shields electromagnetic waves generated from the inverter printed circuit board 700.

The bottom chassis 500 includes a bottom surface 510 and sidewalls 520 extending from an edge of the bottom surface 510 and accommodates the backlight unit 100.

The backlight unit 100 includes a lamp unit 110, a reflecting plate 120, a diffusion plate 130, an optical sheet 140, and a side mold 150.

The lamp unit 110 includes a plurality of lamps 112 that are disposed in parallel with each other on the bottom surface 510 of the bottom chassis 500 to generate light and a lamp holder 114 for fixing the lamps.

The lamps 112 generate light in response to the drive power source. The lamps 112 may be, for example, formed of a cold Cathode Fluorescent Lamp (CCFL) having an elongated cylindrical shape. The lamps 112 are preferably arranged at equal intervals for the uniformity of brightness of the backlight assembly 100, and the number of lamps 112 may vary depending on the required brightness characteristics.

The lamp holder 114 secures the lamps 112. That is, the distal ends of the lamps 112 are fixed to the lamp holder 114, and the lamp holder 114 is fixed to the bottom chassis 500. For example, two lamps 112 adjacent to each other are fixed to one lamp holder 114.

The side mold 150 is disposed on the bottom surface 510 of the bottom chassis 500 to cover one ends of the lamps 112. The side mold 150 extends approximately perpendicular to the lamps 112 along the sidewalls 520 of the bottom chassis 500. Grooves are formed in the side mold 150 to prevent interference with neighboring lamps 112.

The reflector plate 120 is disposed under the lamps 112 to reflect the light from the lamps 112 in an upward direction to improve light utilization efficiency. The reflector 120 is made of a material having high light reflectance. For example, the reflective plate 120 is made of white polyethylene terephthalate (PET) or polycarbonate (PC). In contrast, the reflector 120 may have a structure in which a white reflective sheet is laminated on a metal plate such as aluminum (Al).

The diffuser plate 130 diffuses the light emitted from the lamps 112 to improve luminance uniformity. The diffusion plate 130 is formed in a plate shape having a predetermined thickness and is spaced apart from the lamps 112 at regular intervals. The diffusion plate 130 is made of a transparent material to transmit light.

The optical sheet 140 changes the path of the light diffused through the diffusion plate 130 to improve the luminance characteristic. The optical sheet 140 may include a prism sheet for concentrating the light diffused through the diffusion plate 130 in the front direction to improve the front brightness of the light. Meanwhile, the optical unit having various functions may be added to or removed from the backlight unit 100 according to required luminance characteristics.

The liquid crystal display panel 200 displays an image using light provided from the backlight unit 100. The liquid crystal display panel 200 includes a lower substrate 210, an upper substrate 220, and a liquid crystal layer (not shown).

The lower substrate 210 is formed in a matrix form and includes pixel electrodes made of a transparent conductive material. The lower substrate 210 includes a thin film transistor for switching a driving signal to the pixel electrode.

The upper substrate 220 is disposed to face the lower substrate 210 at regular intervals. The upper substrate 220 includes color pixels for selectively passing only light having a predetermined wavelength. On the entire surface of the upper substrate 220 facing the lower substrate 210, a common electrode formed of a transparent conductive material is formed corresponding to the pixel electrode.

The liquid crystal display panel 200 further includes a printed circuit board 230 and a flexible circuit film 240. The printed circuit board 230 generates a driving signal for driving the liquid crystal display panel 200. The printed circuit board 230 is electrically connected to one edge portion of the lower substrate 210 through the flexible circuit film 240.

When an electric field is formed between the lower substrate 210 and the upper substrate 220 according to the driving signal applied from the printed circuit board 230, the liquid crystal interposed between the lower substrate 210 and the upper substrate 220. The arrangement of the layers (not shown) is changed. Accordingly, the transmittance of the light provided from the backlight unit 100 is changed so that the liquid crystal display 1000 may display an image having a desired gray scale.

The mold frame 300 is coupled to the bottom chassis 500 to fix the backlight unit 100. The mold frame 300 has a stepped portion on an inner side of which the liquid crystal display panel 200 is mounted. That is, the step guides the position of the liquid crystal display panel 200. In addition, the mold frame 300 is coupled to the side wall 520 of the bottom chassis 500 while pressing the edges of the upper surface of the diffusion plate 130 and the optical sheet 140. Therefore, the mold frame 300 fixes the backlight unit 100 and supports the liquid crystal display panel 200.

The first fastening groove 320 is formed on the upper surface 310 of the mold frame 300. The first fastening groove 320 has a spherical shape. The first fastening groove 320 is spaced apart from the upper surface 310 of the mold frame 300 by a predetermined interval and is formed in plurality. That is, the first fastening groove 320 corresponds to the number of first protrusions 410 to be described later.

Top chassis 400 includes a panel fixture 420 and sidewalls 430. The panel fixing part 420 is a rectangular border opened to display an image of the liquid crystal display panel 200. The side wall 430 is formed to be bent and extended from the edge of the cover portion 420.

The first chassis 410 is formed in the top chassis 400 to be fitted into the first fastening groove 320. Specifically, the first protrusion 410 is formed to protrude in the direction of the mold frame 300 from the inner surface of the cover portion 420. The first protrusion 410 has a spherical shape. Accordingly, the shape of the first fastening groove 320 has a spherical shape corresponding to the shape of the first protrusion 410. If the top chassis and the mold frame may be fastened in close contact with each other, the shapes of the first protrusion 410 and the first fastening groove 320 may have various shapes without being limited to spherical shapes.

In addition, the first fastening groove 320 includes a plurality of spaced apart at predetermined intervals corresponding to the first protrusion 410. Meanwhile, as the number of the first protrusions 410 and the first fastening grooves 320 increases, the top chassis 400 and the mold frame 300 will be more strongly coupled.

Through the coupling of the first fastening groove 320 and the first protrusion 410, the top chassis 400 and the mold frame 300 may be closely coupled to reduce foreign material inflow. In addition, in the case of performing the assembly process by combining the first fastening groove 320 and the first protrusion 410, the fastening process may be performed by a single pressing process to simplify the assembly process and shorten the process time. It is also possible to reduce the number of separate parts by excluding the fastening by screws.

3 is an exploded perspective view illustrating a coupling relationship between a control printed circuit board and a bottom chassis illustrated in FIG. 1, and FIG. 4 is a cross-sectional view illustrating a coupling with a control printed circuit board and a bottom chassis illustrated in FIG. 3. In the present embodiment, in order to facilitate understanding, the same components as those in FIGS. 1 and 2 will use the same names and reference numerals.

3 and 4, the control printed circuit board 600 is disposed on the bottom of the bottom chassis 500 to generate a control signal for controlling the driving of the liquid crystal display panel 200. The first shield case 610 covers the control printed circuit board 600.

The control printed circuit board 600 outputs a control signal for controlling the driving of the liquid crystal display panel 200 in response to various electrical signals supplied from an external main board (not shown). To this end, the control printed circuit board 600 includes electronic components such as a timing controller and a memory.

The control printed circuit board 600 is protected by the first shield case 610. The first shield case 610 includes a bottom surface on which the control printed circuit board 600 is seated and sidewalls extending from an edge of the bottom surface. The first shield case 610 is coupled to the bottom chassis 500 while covering the control printed circuit board 600. The first shield case 610 protects the control printed circuit board 600 from external impact.

Meanwhile, the first shield case 610 has a second protrusion 612 having a spherical shape. The second protrusion 612 is formed to protrude from the first shield case 610 in the direction of the bottom chassis 500. The bottom chassis 500 has a spherical second fastening groove 530 that is coupled to the second protrusion 612. On the other hand, since the bottom chassis 500 is a thin plate-shaped metal plate, the second fastening groove 530 is formed to protrude upward from the inner surface of the bottom chassis 500.

The first shield case 610 and the bottom chassis 500 are second protrusions 612 formed on the first shield case 610 and second fastening grooves 530 formed on the bottom surface 510 of the bottom chassis 500. Is coupled by fastening. Like the first protrusion 410 and the first fastening groove 320, the second protrusion 612 and the second fastening groove 530 may have various shapes as long as they can be fastened in close contact with each other.

In addition, the second protrusion 612 is formed at the edge of the first shield case 610, and the second fastening groove 530 is formed in the bottom chassis 500 in the region corresponding to the second protrusion 612. . In order to further strengthen the coupling between the first shield case 610 and the bottom chassis 500, a plurality of second protrusions 612 and second coupling grooves 530 may be formed.

Therefore, the bottom chassis 500 and the first shield case 610 may be closely coupled through the coupling of the second fastening groove 530 and the second protrusion 612 to reduce the inflow of foreign substances. In addition, assembling of the second fastening groove 530 and the second protrusion 612 simplifies the assembly process, thereby shortening the process time and reducing the number of separate parts.

FIG. 5 is an exploded perspective view illustrating a coupling relationship between an inverter printed circuit board and a bottom chassis illustrated in FIG. 1. In the present embodiment, in order to facilitate understanding, the same components as those in FIGS. 1 and 2 will use the same names and reference numerals.

Referring to FIG. 5, the inverter printed circuit board 700 is disposed on the bottom of the bottom chassis 500 to generate a driving signal for driving the backlight unit 100. The second shield case 710 covers the inverter printed circuit board 700.

The inverter printed circuit board 700 boosts a low potential AC power applied from the outside to a high potential AC power suitable for driving the lamps 112 and outputs driving power.

The inverter printed circuit board 700 is disposed on the rear surface of the bottom surface 510 of the bottom chassis 500. Only one inverter printed circuit board 700 is disposed at one end of the bottom surface 510 corresponding to one end of the lamps 112. In contrast, the inverter printed circuit board 700 may be disposed at each of both ends of the bottom surface 510 corresponding to both ends of the lamps 112.

The inverter printed circuit board 700 is protected by the second shield case 710. The second shield case 710 is coupled to the bottom chassis 500 while covering the inverter printed circuit board 700. The second shield case 710 protects the inverter printed circuit board 700 from external impact and shields electromagnetic waves generated from the inverter printed circuit board 700.

On the other hand, the second shield case 710 has a spherical third protrusion 712. The third protrusion 712 is formed to protrude from the second shield case 710 in the direction of the bottom chassis 500. The bottom chassis 500 has a spherical third fastening groove 540 coupled with the third protrusion 712. On the other hand, since the bottom chassis 500 is a thin plate-shaped metal plate, the third fastening groove 530 is formed to protrude upward from the inner surface of the bottom chassis 500.

The second shield case 710 and the bottom chassis 500 may include a third protrusion 712 formed on the second shield case 710 and a third fastening groove 540 formed on the bottom surface 510 of the bottom chassis 500. Is coupled by fastening. Like the first protrusion 410 and the first fastening groove 320, the third protrusion 712 and the third fastening groove 540 may have various shapes as long as they can be fastened in close contact with each other.

In addition, the third protrusion 712 is formed at the edge of the second shield case 710, and the third fastening groove 540 is formed in the bottom chassis 500 of the region corresponding to the third protrusion 712. . In order to further strengthen the coupling between the second shield case 710 and the bottom chassis 500, a plurality of third protrusions 712 and third coupling grooves 540 may be formed.

Accordingly, the bottom chassis 500 and the second shield case 710 may be closely coupled through the coupling of the third fastening groove 540 and the third protrusion 712 to reduce the inflow of foreign substances. In addition, by assembling the third fastening groove 540 and the third protrusion 712, the assembly process may be simplified to shorten the process time, and may reduce the number of separate parts.

According to such a liquid crystal display, the mold frame and the top chassis are combined by a button type by protrusions and fastening grooves, not screws, thereby simplifying the assembly process and reducing the number of parts. This can be combined through a single pressing process by specifying the position of the protrusion and the locking groove during the assembly process.

In addition, in the case of the conventional coupling method, a problem of deterioration of display quality due to the inflow of foreign matter through the hole into which the screw is inserted has occurred, but the path of the inflow of foreign matter by combining the mold frame and the top chassis through the protrusions and the coupling grooves. Can be blocked.

On the other hand, the button-type coupling method by the protrusion and the fastening groove is not limited to the mold frame and the top chassis, and may be applied to the coupling method of the shield cases and the bottom chassis that cover the control printed circuit board and the inverter printed circuit board. .

In the detailed description of the present invention described above with reference to a preferred embodiment of the present invention, those skilled in the art or those skilled in the art having ordinary knowledge in the scope of the invention described in the claims to be described later It will be understood that various modifications and variations can be made in the present invention without departing from the scope of the present invention.

Claims (7)

Bottom chassis; A backlight unit accommodated in the bottom chassis to generate light; A mold frame coupled to the bottom chassis to fix the backlight unit and having a first coupling groove formed on an upper surface thereof; A liquid crystal display panel mounted on the mold frame and displaying an image using light from the backlight unit; And And a top chassis coupled to the mold frame to fix the liquid crystal display panel and having a first protrusion formed in the first fastening groove. The liquid crystal display of claim 1, wherein the first protrusion has a spherical shape, and the first fastening groove has a spherical shape corresponding to the first protrusion. The method of claim 1, wherein the first protrusion is made of a plurality of spaced apart at a predetermined interval, And a plurality of first fastening grooves corresponding to the first protrusions. The display apparatus of claim 1, further comprising: a control printed circuit board disposed on a rear surface of the bottom chassis to generate a control signal for controlling driving of the liquid crystal display panel; And And a first shield case covering the control printed circuit board. The method of claim 4, wherein the first shield case includes a spherical second protrusion, And the bottom chassis includes a spherical second coupling groove coupled to the second protrusion. The semiconductor device of claim 1, further comprising: an inverter printed circuit board disposed on a rear surface of the bottom chassis to generate a driving signal for driving the backlight unit; And And a second shield case covering the inverter printed circuit board. The method of claim 6, wherein the second shield case includes a spherical third protrusion, And the bottom chassis includes a spherical third coupling groove coupled to the third protrusion.

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