KR20060059084A - Liquid crystal display and method of fabricating thereof - Google Patents

Abstract

A liquid crystal display device and a method of manufacturing the same are provided. The device and its manufacturing method include a clasp formed in the rear of the module frame, and interposed by interlocking the PCB to the clasp. It provides an advantage that can facilitate the assembly and separation of the liquid crystal display device.

LCD, Module Frame, PCB, FPCB

Description

Liquid crystal display and manufacturing method thereof

1 is a perspective view of the components constituting the back light unit assembly according to the prior art,

2A to 2C are perspective views illustrating a liquid crystal display and a method of manufacturing the same according to the prior art;

3 is a perspective view of the components constituting the backlight unit assembly according to the present invention;

4A to 4D are bottom and side views illustrating the latch formed on the rear of the module frame according to the present invention;

5A to 5D are perspective views illustrating a liquid crystal display and a manufacturing method thereof according to the present invention.

<Explanation of symbols for the main parts of the drawings>

100, 300: backlight unit assembly 110, 310: reflector

120, 320: module frame 130, 330: light source

140, 340: Light guide plate 160, 360: Optical sheet

270, 570: Printed Circuit Board (PCB)

427 latch

The present invention relates to a liquid crystal display device and a manufacturing method thereof, and more particularly, to a liquid crystal display device having a clasp formed on the back of the module frame and a manufacturing method thereof.

Recently, a flat panel display having a merit of small size and light weight by solving problems of weight and size of a cathode ray tube (CRT) has been attracting attention. Such flat panel displays include Liquid Crystal Display (LCD), Organic Electro Luminescence Display (OELD), Field Emitter Display (FED) and Plasma Display (PDP). Panel).

Among such flat panel displays, LCD (Liquid Crystal Display) is an apparatus that changes the optical anisotropy by applying an electric field to the liquid crystal that combines the liquidity and the optical characteristics of the crystal, the power consumption compared to the conventional cathode ray tube (Cathode Ray Tube) It is low, easy to thin and short, large size and high resolution is widely used.

In general, the LCD module structure is largely composed of three units. That is, a driving circuit unit including an LCD panel in which liquid crystal is injected between two substrates, a driver LSI for driving the LCD panel, and a printed circuit board to which various circuit elements are attached (hereinafter referred to as a PCB); It consists of a Back Light Unit Assembly including a Backlight.

1 is a perspective view of the components constituting the backlight unit assembly according to the prior art.

Referring to FIG. 1, the backlight unit assembly 100 includes a light source unit 130, a light guide plate 140, an optical sheet 160, a module frame 120, and a reflecting plate 110.

Looking at, the module frame 120 is formed with an opening, the lower portion of the reflecting plate 110 is accommodated. The light source unit 130 is positioned on the reflective plate 110 through an opening formed in the module frame 120, and the light guide plate 140 is positioned at a side of the light source unit 130. The light source unit 130 may be attached to and driven by a flexible printed circuit (FPC) 150. Various kinds of optical sheets 160 such as a diffusion plate are disposed on the light guide plate 140.

2A to 2D are perspective views illustrating a liquid crystal display and a manufacturing method thereof according to the prior art.

Referring to FIG. 2A, the backlight unit assembly 100 described with reference to FIG. 1 is provided. The light source unit 130 and the light guide plate 140 are positioned in the opening 126, and the optical sheet 160 is positioned on the light guide plate 140.

A liquid crystal display panel (hereinafter, referred to as an LCD panel) 290 to be described later is accommodated on the module frame 120 including the optical sheet 160. In addition, the reflector 110 is interposed below the module frame 120.

The PCB (Printed Circuit Board, 270) is attached to the lower portion of the backlight unit assembly 100, conventionally attached using an adhesive tape 280. That is, the PCB 270 is attached by adhering the adhesive tape 280 between the reflective plate 110 and the PCB 270 disposed below the backlight unit assembly 100.

Referring to FIG. 2B, it can be seen that the PCB 270 is attached to the reflective plate 110 by the adhesive tape 280 and attached to the lower portion of the backlight unit assembly 100.

However, since the PCB 270 is attached using an adhesive tape, the cost of purchasing the adhesive tape 280 increases, and the thickness of the LCD module increases by the thickness occupied by the adhesive tape 280. There is a problem. In addition, when the PCB 270 is separated, the components on the reflective plate 110 are also separated, so that once the PCB 270 is separated, it is difficult to reuse. In addition, since a separate process of attaching the PCB 270 through the adhesive tape 280 is required, the assembly process of the LCD module is increased.

Referring to FIG. 2C, the LCD panel 290 is accommodated on the backlight unit assembly 100 to which the PCB 270 is attached. The PCB 270 is connected to the LCD panel 290.

SUMMARY OF THE INVENTION The present invention has been made in an effort to solve the above-described problems of the related art, and an object thereof is to provide a liquid crystal display device and a method of manufacturing the same, which may easily or intervene a PCB in a backlight unit assembly.

In order to achieve the above technical problem, an aspect of the present invention provides a liquid crystal display device. The apparatus has an LCD panel. A backlight unit assembly is disposed under the LCD panel, and the backlight unit assembly includes a light source unit, a light guide plate, an optical sheet, a rear surface of the module frame, and a reflective frame formed with an opening. A hole is formed and includes a printed circuit board (PCB) interposed by being fastened to a latch formed in the module frame through the hole. As a result, the number of assembly steps of the LCD module can be reduced to simplify the assembly, and the PCB can be interposed in the backlight unit assembly without using the adhesive tape. The clasps may be formed on the left side and the right side of the rear of the module frame, or formed on the upper side and the lower side. At least one clasp may be formed at each side.

The backlight unit assembly may include a reflector plate, a module frame having an opening positioned on the reflector, a light source unit positioned on the reflector through an opening of the module frame, a light guide plate positioned on a side of the light source unit, and an optical sheet positioned on the light guide plate. It includes. The module frame may be made of a plastic material, and may use a light emitting diode (LED) or an EL element as the light source unit.

The PCB is connected to control the LCD panel, and may be a flexible printed circuit board (hereinafter, referred to as FPCB).

Another aspect of the present invention to achieve the above technical problem provides a method of manufacturing a liquid crystal display device. The manufacturing method includes providing a backlight unit assembly including a light source unit, a light guide plate, an optical film, a rear surface of which a clasp is formed, and a module frame and a reflection plate having an opening. Holes are formed in the PCB, and the PCBs are interposed by fastening the PCB to the latches formed on the mold frame rear surface through the holes formed in the PCB. Fixing an LCD panel onto the module frame.

The clasp-shaped module frame may be formed using a mold. In particular, when the module frame is a plastic material, an injection mold may be used.

The fixing of the LCD panel on the module frame may include attaching an adhesive tape to the lower portion of the LCD panel and fixing it on the module frame. The adhesive tape may be one in which the area corresponding to the light emitting area of the LCD panel is transparent and the other area is black.

Providing the backlight unit assembly includes interposing the reflector below the module frame. The light guide plate is positioned on the light source unit and the light source side on the reflection plate through the opening of the module frame. Positioning the optical sheet on the light guide plate.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings in order to describe the present invention in more detail. However, the present invention is not limited to the embodiments described herein but may be embodied in other forms. Like numbers refer to like elements throughout the specification.

3 is a perspective view of the components constituting the backlight unit assembly according to the present invention.

Referring to FIG. 3, the backlight unit assembly 300 includes a light source unit 330, a light guide plate 340, an optical sheet 360, a module frame 320, and a reflector plate 310.

The backlight unit assembly 300 illustrated in the present invention relates to a backlight unit assembly that implements a field sequential (FS) -LCD in a liquid crystal display. In general, a TFT LCD uses a color filter to group three pixels that produce R, G, and B (red, green, and blue) to form one pixel, whereas the FS-LCD uses a single pixel as one pixel. It is characteristic. Accordingly, the FS-LCD has been evaluated as being suitable for realizing a video because it has excellent resolution and color reproducibility and a fast response speed.

Looking at the components constituting the backlight unit assembly 300 in detail, first, an opening 326 is formed in the module frame 320. A clasp is formed on the rear surface of the module frame 320. In the present invention, a clasp is formed on the rear surface of the module frame 320 to interpose a PCB (Printed Circuit Board) to be described later to the clasp. The detailed description will be made with reference to FIGS. 4A to 4D.

The module frame 320 may be made of a plastic material. The clasp-shaped module frame 320 can be formed using a mold, it is preferable to form in advance through a precise mold process before assembling the LCD module. In particular, when the module frame is a plastic material, it is preferable to use an injection mold.

The reflector 310 is interposed below the module frame 320. The reflective plate 310 may be attached by applying an adhesive material to a portion other than the opening 326 on the rear surface of the module frame 320. The reflector 310 serves to reflect the light generated by the light source 330 to the front of the light guide plate 340.

An opening 326 is formed in the module frame 320, and a light source unit 330 is positioned on the reflective plate 310 exposed through the opening 326. As the light source unit 330, a light emitting diode (LED) chip or an EL element can be used. As described above, since the FS-LCD uses a single pixel as one pixel, an LED or an EL element capable of emitting R, G, and B (red, green, blue) can be used.

The light guide plate 340 is positioned at the side of the light source unit 330. The light guide plate 340 guides the light generated from the light source unit 330 to the side. The light source unit 330 may be attached to the FPC 350 to be driven.

The optical sheet 350 is positioned on the light guide plate 340. As the optical sheet 350, a diffusion plate or a brightness enhancement film (BEF) may be interposed.

The diffusion plate is an optical sheet for diffusing light generated from the light source unit 330, and the BEF is a transparent optical sheet for increasing the efficiency of the light source unit using the principle of reflection and refraction.

4A to 4D are bottom and side views illustrating the clasps formed on the rear surface of the module frame according to the present invention, and show the module frame shown in FIG. 3 in the opposite direction.

4A and 4B, clasps 427 are formed at left and right sides of the rear surface of the module frame 320. 4B is a view of the module frame 320 from the left or the right side. Since the opening 326 is formed in the module frame 320, the latch 427 is formed in a region other than the opening 326.

The clasps 427 may form two clasps 427 on the left side and the right side, respectively. However, the present invention is not limited thereto, and three or more pieces may be formed as necessary to fasten the PCB. The clasp 427 has a 'b' shape, but is not limited thereto, and may have various shapes to fasten the PCB.

4C and 4D, clasps 427 are formed at upper and lower sides of the rear surface of the module frame 320, and two clasps 427 are formed. Except for the above, it is the same as described in Figures 4a and 4b.

5A to 5D are perspective views illustrating a liquid crystal display and a manufacturing method thereof according to the present invention.

Referring to FIG. 5A, the backlight unit assembly 300 described with reference to FIG. 3 is provided. The light source unit 330 and the light guide plate 340 are positioned in the opening 326 around the module frame 320, and the optical sheet 360 is positioned on the light guide plate 340.

A liquid crystal display panel 590 to be described later is accommodated on the module frame 320 including the optical sheet 360. The reflector 310 is interposed below the module frame 320.

Clasps 427 are formed on the left and right sides of the rear surface of the module frame 320 as described above. LCD panel 590 to be described later is connected to the PCB 570 and controlled, to match the hole (427a) formed in the PCB to the clasp 427, the PCB 570 to the module frame 320 Push in the vertical direction with the back of the.

The PCB 570 may use a PCB in the form of a rigid board, or may use a flexible printed circuit board (FPCB).

5B and 5C, the PCB 570 is fastened to the clasps 427 formed at the left and right sides of the rear surface of the module frame 320. That is, the PCB 570 is interposed by pushing the PCB 570 in the direction of the arrow so that the PCB 570 is fitted to the latch 427. It can be seen that it is interposed in the lower portion of the reflecting plate 110 without using the adhesive tape used in the prior art.

That is, in the present invention, since the adhesive tape is not used, the cost of purchasing the adhesive tape can be reduced, and the thickness of the LCD module can be reduced by the thickness occupied by the adhesive tape. In addition, the number of assembly processes can be reduced, so that the LCD module can be easily assembled. In addition, the PCB 570 can be easily separated from the backlight unit assembly 300 to facilitate reuse.

Referring to FIG. 5D, the LCD panel 590 is fixed on the module frame 320 to which the PCB 570 is attached. In this case, an adhesive tape may be attached to the lower portion of the LCD panel 590, and the LCD panel 590 may be fixed on the module frame 320. In the adhesive tape, an area corresponding to a light emitting area of the LCD panel 590 is transparent, and other areas are preferably black. Thus, light emitted from the light source unit 330 may be prevented from leaking to the outside.

After fixing the LCD panel 590 on the module frame 320, the PCB 570 and the LCD panel 590 are connected to complete a liquid crystal display.

According to the present invention as described above, by interposing the PCB or FPCB to the clasp formed on the back of the module frame without using the adhesive tape, the number of assembly processes can be reduced, so that the LCD module can be easily assembled. In addition, the PCB can be easily separated for easy reuse. In addition, since the adhesive tape is not used, the cost of purchasing the adhesive tape can be reduced, and the thickness of the LCD module by the thickness of the adhesive tape can be reduced.

While the foregoing has been described with reference to preferred embodiments of the present invention, those skilled in the art will be able to variously modify and change the present invention without departing from the spirit and scope of the invention as set forth in the claims below. Could be.

Claims (19)

A liquid crystal display (LCD) panel; Located below the LCD panel, A back light unit assembly having a light source unit, a light guide plate, an optical sheet, a rear surface thereof, and a module frame and a reflecting plate having clasps and openings formed therein; And And a hole formed therein, and including a printed circuit board (PCB) interposed by being fastened to a latch formed in the module frame through the hole. The method of claim 1, The backlight unit assembly A reflector; A module frame having an opening positioned on the reflector; A light source unit positioned on the reflector and a light guide plate positioned on a side of the light source unit through an opening of the module frame; And And an optical sheet positioned on the light guide plate. The method of claim 1, And the latches are formed on the left side and the right side of the rear of the module frame. The method of claim 1, And the latch is formed above and below the rear surface of the module frame. The method according to claim 3 or 4, And at least one clasp is formed at each side. The method of claim 1, And the PCB controls the LCD panel. The method of claim 1, The PCB is a liquid crystal display device, characterized in that the flexible printed circuit board (FPCB). The method of claim 1, The module frame is a liquid crystal display, characterized in that made of a plastic material. The method of claim 1, The light source unit includes a light emitting diode (LED) or an electro luminescence (EL) element. Providing a backlight unit assembly having a light source unit, a light guide plate, an optical sheet, a rear surface thereof, and a module frame and a reflecting plate having a latch formed therein; Providing a printed circuit board (PCB) in which a hole is formed, and interposing the PCB to a latch formed on a rear surface of the mold frame through a hole formed in the PCB; And fixing an LCD panel on the module frame. The method of claim 10, Providing the backlight unit assembly The reflective plate is interposed below the module frame, Positioning a light guide plate on the light source portion and on the side of the light source portion on the reflecting plate through the opening of the module frame; And arranging an optical sheet on the light guide plate. The method of claim 10, The clasp is formed on the left side and the right side of the rear of the module frame manufacturing method of the liquid crystal display device. The method of claim 10, And the latch is formed above and below the rear surface of the module frame. The method according to claim 12 or 13, And at least one clasp is formed on each side of the liquid crystal display device. The method of claim 10, The clasp-shaped module frame is a manufacturing method of the liquid crystal display device, characterized in that formed using a metal mold. The method of claim 10, Fixing the LCD panel on the module frame Attaching an adhesive tape to the lower portion of the LCD panel and fixing the LCD panel on the module frame. The method of claim 16, The adhesive tape is And an area corresponding to the light emitting area of the LCD panel is transparent, and other areas are black. The method of claim 10, And fixing the LCD panel to the module frame, and then connecting the PCB to the LCD panel. The method of claim 10, The PCB is a method of manufacturing a liquid crystal display device, characterized in that the flexible printed circuit board (FPCB).

Images