KR20080068414A - Liquid crystal display device and fabrication method thereof - Google Patents

Abstract

An LCD(Liquid Crystal Display) and a method for manufacturing the same are provided to shorten manufacturing time and reduce manufacturing cost by providing a mold frame to fix a liquid crystal panel and combining the mold frame directly with a backlight assembly, without using an existing upper chassis. An LCD(400) comprises a liquid crystal panel(310), a PCB(Printed Circuit Board)(330), a backlight assembly(100), and a mold frame(200). The liquid crystal panel displays images. The PCB, connected with the liquid crystal panel, supplies a drive signal to the liquid crystal panel. The backlight assembly, located below the liquid crystal panel, supplies light to the liquid crystal panel. The mold frame, which covers the backlight assembly, comprises a receiving slot so as to receive and fix the liquid crystal panel. The mold frame consists of the first sub mold frame and the second sub mold frame. The receiving slot, into which the liquid crystal panel is slid and inserted, is formed in the first sub mold frame. The second sub mold frame, combined with the first sub mold frame, fixes the inserted liquid crystal panel.

Description

Liquid crystal display and manufacturing method thereof

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

2 is a view showing the structure of the mold frame of FIG.

FIG. 3 is a view illustrating a coupling structure of the liquid crystal panel and the mold frame of FIG. 1.

4 is a cross-sectional view taken along the line IV to IV 'of FIG. 1.

5 is a cross-sectional view taken along the line VV ′ of FIG. 1.

6 is a cross-sectional view taken along the line VV ′ of the liquid crystal display according to another exemplary embodiment of the present invention.

7 is a flowchart illustrating a method of manufacturing a liquid crystal display according to the present invention.

(Explanation of symbols for the main parts of the drawing)

100: backlight assembly 110: optical sheets

120: light source unit 121: light source

123: light source cover 130: light guide plate

140: reflective sheet 150: storage container

200: mold frame 210: first sub mold frame

213: receiving groove 250: second sub-molded frame

310: liquid crystal panel 400: liquid crystal display device

The present invention relates to a liquid crystal display device and a manufacturing method thereof. More particularly, the present invention relates to a liquid crystal display device in which a liquid crystal panel is inserted into and fixed to a mold frame, and a manufacturing method thereof.

The liquid crystal display performs a display function using the electrical and optical properties of the liquid crystal injected into the liquid crystal panel, and has been widely applied in various fields due to advantages such as small size, light weight, and low power consumption.

Conventional liquid crystal display devices include a backlight assembly for providing light, a mold frame, a liquid crystal panel, and an upper storage container. In the method of manufacturing the liquid crystal display, first, the backlight assembly and the mold frame are combined, the liquid crystal panel is fixed on the upper part, and the upper storage container is combined with the mold frame to complete the liquid crystal display. Such a liquid crystal display requires a lot of manufacturing time and cost.

An object of the present invention is to provide a liquid crystal display device which can shorten the manufacturing time and reduce the manufacturing cost.

Another object of the present invention is to provide a method of manufacturing such a liquid crystal display.

The technical problems of the present invention are not limited to the above-mentioned technical problems, and other technical problems not mentioned will be clearly understood by those skilled in the art from the following description.

According to an aspect of the present invention, a liquid crystal display device includes: a liquid crystal panel for displaying an image, a printed circuit board connected to the liquid crystal panel, and supplying a driving signal to the liquid crystal panel; And a mold frame including a backlight assembly positioned under the panel to supply light to the liquid crystal panel, and a receiving groove covering the backlight assembly and configured to insert and fix the liquid crystal panel.

According to another aspect of the present invention, there is provided a method of manufacturing a liquid crystal display device, a printed circuit board that is connected to the liquid crystal panel and a liquid crystal panel that displays an image, and supplies a driving signal to the liquid crystal panel. And a first sub-molded frame disposed under the liquid crystal panel to supply light to the liquid crystal panel, a first sub-molded frame covering the backlight assembly, and a receiving groove for sliding and accommodating the liquid crystal panel. Preparing a mold frame including a second sub mold frame which is combined with a sub mold frame to fix the liquid crystal panel, combining the first sub mold frame and the backlight assembly, and the first sub mold frame Slidingly coupling the liquid crystal panel to the first sub mold frame And a step of combining the second sub-group the mold frame.

Other specific details of the invention are included in the detailed description and drawings.

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various forms, and only the present embodiments are intended to complete the disclosure of the present invention, and the general knowledge in the art to which the present invention pertains. It is provided to fully convey the scope of the invention to those skilled in the art, and the present invention is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

Hereinafter, with reference to the accompanying drawings will be described embodiments of the present invention;

A liquid crystal display according to an exemplary embodiment of the present invention will be described with reference to FIGS. 1 to 5. 1 is an exploded perspective view of a liquid crystal display according to an exemplary embodiment of the present invention, FIG. 2 is a diagram illustrating a structure of a mold frame of FIG. 1, and FIG. 3 is a diagram illustrating a coupling structure of a liquid crystal panel and a mold frame of FIG. 1. Drawing. 4 is a cross-sectional view taken along the line IV-IV 'of FIG. 1, and FIG. 5 is a cross-sectional view taken along the line V-V' of FIG.

The liquid crystal display device 400 includes a backlight assembly 100 for providing light, a liquid crystal panel 310, and a mold frame 200 for fixing and receiving the light.

The backlight assembly 100 may include a light source unit 120, a light guide plate 130, a reflective sheet 140, optical sheets 110, a storage container 150, and the like.

The light source unit 120 is disposed adjacent to one side of the light guide plate 130 and includes a light source 121 and a light source cover 123 surrounding the light source 121. The light source 121 may be a line light source such as a Cold Cathode Fluorescent Lamp (CCFL) or a Hot Cathode Fluorescent Lamp (HCFL), and may be a light emitting diode (LED). It is also possible to use a light source. In this embodiment, an example using a cold cathode light source will be described. The light source 121 may be composed of, for example, a pair of lamps, wherein each lamp is spaced at a uniform distance by a predetermined fixing part, for example, an eight-shaped transparent fixing ring (not shown). Can be fixed.

The light source cover 123 surrounds the light source 121 described above, for example, a pair of lamps, and protects the lamps from the outside. In addition, the light source cover 123 may be formed in a 'c' shape in which one side is opened, and the light guide plate 130 may be inserted into and fixed to the light source cover 123 or positioned adjacent to the side. In detail, one side of the light source cover 123 facing the light guide plate 130 is open, and one side of the light guide plate 130 is in contact with the open side. The light source cover 123 may be formed of a metal material, for example, aluminum, but is not limited thereto.

Meanwhile, the light source unit 120 may be disposed on a long side or a short side of the light guide plate 130 having a plate shape, and two light source units 120 may be disposed on a neighboring side or an opposite side. In the present exemplary embodiment, one light source unit 120 is disposed on two long sides of the light guide plate 130 as an example.

The light guide plate 130 serves to guide the light emitted from the light source unit 120 toward the upper side of the backlight assembly 100, that is, the liquid crystal panel 310. The light guide plate 130 is made of a material having good refractive index and transmittance. In addition, a scattering pattern (not shown) is formed on the rear surface of the light guide plate 130 to guide light incident from the side surface of the light guide plate 130 to the upper side. The scattering pattern may be formed by applying a scattering material to the rear surface of the light guide plate 130 and patterning the scattering material, and by applying a predetermined bending to the rear surface of the light guide plate 130, but is not limited thereto.

The reflective sheet 140 is disposed under the light guide plate 130. The reflective sheet 140 is positioned between the light guide plate 130 and the storage container 150 to reflect the light leaking through the rear surface of the light guide plate 130 back to the upper side of the light guide plate 130, thereby increasing the luminance of the backlight assembly 100. And increase light uniformly to the upper side of the light guide plate 130.

As the reflective sheet 140, a material having good elasticity, excellent light reflection, and thinness may be used. In addition, if necessary, a thin film having good elasticity may be used by coating a reflective film to increase light reflection.

The optical sheets 110 are disposed on the light guide plate 130. The optical sheets 110 allow the light guided by the light guide plate 130 to be uniformly irradiated to the upper side of the backlight assembly 100, and for example, an optical sheet such as one or more diffusion sheets, prism sheets, or protective sheets is optional. It can be made to be stacked. At this time, only one optical sheet may be disposed, and a plurality of identical optical sheets may be disposed. In addition, the stacking order of the optical sheet may be variously modified in a range of increasing the uniformity of light. The optical sheets 110 may be formed of a transparent resin such as an acrylic resin, a polyurethane resin, or a silicone resin.

The storage container 150 has a predetermined storage space formed therein to accommodate the reflective sheet 140, the light guide plate 130, the light source unit 120, and the optical sheets 110. The storage container 150 may be made of a metal material such as aluminum or aluminum alloy.

The liquid crystal panel 310 displaying an image using light provided from the backlight assembly 100 includes a first display panel 311, a second display panel 312, and a first display panel 311 and a second display panel 312. It includes a liquid crystal layer (not shown) formed between.

The first display panel 311 includes a plurality of gate lines having a predetermined interval and extending in a first direction, and a plurality of data lines, gate lines, and data lines extending in a second direction and arranged at regular intervals so as to intersect the gate line. A thin film transistor is formed in the pixel area defined by the pixel electrode and the gate line, which are switched by signals of the matrix electrode, to transfer the signal of the data line to each pixel electrode.

The second display panel 312 is formed with a light blocking pattern for blocking light in portions other than the pixel area, an RGB color pattern for expressing color colors, and a common electrode for implementing an image.

A printed circuit board (PCB) 330 is electrically connected to one side of the liquid crystal panel 310 by a tape carrier package (TCP) 320. A plurality of electronic components for generating a driving signal of the liquid crystal panel 310 are mounted on the printed circuit board 330 by a surface mount technology method. In addition, the tape carrier package 320 is equipped with a driving chip for driving the liquid crystal panel 310 in the center portion. The printed circuit board 330 and the tape carrier package 320 apply a driving signal and a timing signal to the gate line and the data line of the first display panel 311 so as to control the arrangement angle of the liquid crystals and the timing when the liquid crystals are arranged. . The printed circuit board 230 is located at the side of the backlight assembly 100.

The mold frame 200 is coupled to the storage container 150 to include a storage groove 213 formed to cover / fix the backlight assembly 100 and to fix the liquid crystal panel 310.

Hereinafter, the structure of the mold frame and the combined structure of the liquid crystal display will be described in detail with reference to FIGS. 2 to 5.

The liquid crystal panel 310 has a rectangular shape including a long side and a short side, and the mold frame 200 includes a first sub mold frame 210 in which the liquid crystal panel 310 slides and a first sub mold frame 210. And a second sub-mold frame 250 that is fixed to the liquid crystal panel 310 in combination with each other, and may be formed of a synthetic resin having insulating properties.

The accommodating groove 213 formed on the inner sidewall of the first sub mold frame 210 is slidably coupled along the long side or the short side of the liquid crystal panel 310 so that the liquid crystal panel 310 is inserted and fixed, and the first accommodating protrusion 211 is provided. And a second accommodation protrusion 212. The first accommodating protrusion 211 protrudes from the at least one side wall of the first sub-molded frame 210 by a predetermined width, and the second accommodating protrusion 212 protrudes from the side wall by a predetermined width, and the first accommodating protrusion ( It is formed parallel to the upper part of 211). The backlight assembly 100 includes a reflective sheet 140, a light guide plate 130, a light source unit 120, an optical sheet 110, and a storage container 150 for storing them below the first storage protrusion 211. ) Is positioned, and the first sub mold frame 210 and the storage container 150 of the backlight assembly 100 are combined to cover / fix the backlight assembly. Accordingly, the liquid crystal panel 310 is positioned above the first accommodating protrusion 211 and the backlight assembly 100 is positioned below the liquid crystal panel 310 using light provided by the backlight assembly 100 upward. An image can be displayed. The second receiving protrusion 212 defines an effective display area of the liquid crystal panel 310.

The second sub mold frame 250 fixes the liquid crystal panel 310 and defines an effective display area of the liquid crystal panel 310 together with the second receiving protrusion 212 of the first sub mold part 210. In addition, the printed circuit board 330 disposed on the side of the backlight assembly 100 is covered.

Hereinafter, a structure of a second mold frame of the liquid crystal display according to another exemplary embodiment of the present invention will be described with reference to FIG. 6. 6 is a cross-sectional view taken along the line VV ′ of the liquid crystal display according to another exemplary embodiment of the present invention. For convenience of description, members having the same functions as the members shown in the drawings of the embodiments described with reference to FIGS. 1 to 5 are denoted by the same reference numerals, and description thereof is omitted.

The liquid crystal display device 400 according to another exemplary embodiment includes a backlight assembly 100, a liquid crystal panel 310, a mold frame 200 for fixing and accommodating them, and is connected to the liquid crystal panel 310 to be connected to the liquid crystal panel 310. The printed circuit board 330 that provides a driving signal to the back light is bent and disposed at the rear surface of the backlight assembly 100.

The second sub mold frame 250 includes a fixed mold part 251 and a cover mold part 252. The fixed mold part 251 fixes the liquid crystal panel 310 and defines an effective display area of the liquid crystal panel 310 together with the second receiving protrusion 212 of the first sub mold part 210. The cover mold part 252 connected to the fixed mold part 251 covers the printed circuit board 330 that is bent and disposed on the rear surface of the backlight assembly 100, thereby fixing the printed circuit board 330 to the backlight assembly 100. And protect it from the outside.

In addition, the second sub mold frame 250 may be coupled to the first sub mold frame 210 through hook coupling or screw coupling, but the present invention is not limited thereto.

Hereinafter, a method of manufacturing a liquid crystal display according to the present invention will be described with reference to FIG. 7. 7 is a flowchart illustrating a method of manufacturing a liquid crystal display according to the present invention.

First, a liquid crystal panel 310 for displaying an image, a printed circuit board 330 connected to the liquid crystal panel 310 and supplying a driving signal to the liquid crystal panel 310, and positioned below the liquid crystal panel 310 A first sub-molded frame 210 having a backlight assembly 100 for supplying light to the liquid crystal panel 310, a receiving groove 213 covering the backlight assembly 100 and in which the liquid crystal panel 310 is slid and received. ), And a mold frame 200 including a second sub mold frame 250 fixed to the liquid crystal panel 310 by combining with the first sub mold frame 210.

Subsequently, the first sub mold frame and the backlight assembly are coupled to each other (S10).

The receiving groove 213 formed on the inner sidewall of the first sub mold frame 210 is formed of the first receiving protrusion 211 and the second receiving protrusion 212. The first accommodating protrusion 211 protrudes from the at least one side wall of the first sub-molded frame 210 by a predetermined width, and the second accommodating protrusion 212 protrudes from the side wall by a predetermined width, and the first accommodating protrusion ( It is formed parallel to the upper part of 211). The backlight assembly 100 includes a reflective sheet 140, a light guide plate 130, a light source unit 120 and optical sheets 110, and a storage container 150 for storing them below the first storage protrusion 211. ) Is positioned and the backlight assembly 100 is covered / fixed by combining the first sub-molded frame 210 and the storage container 150 of the backlight assembly 100.

Subsequently, the first sub mold frame and the liquid crystal panel are slidably coupled (S20).

The short side of the liquid crystal panel 310 is slidably coupled along the receiving groove 213 formed at the short side of the first sub mold frame 210, so that the long side of the liquid crystal panel 310 is also extended to the long side of the first sub mold frame 210. It is inserted and fixed in the receiving groove 213 formed.

Subsequently, the first sub mold frame and the second sub mold frame are combined (S30).

The liquid crystal panel 310 is fixed by combining the first sub mold frame 210 and the second sub mold frame 250 and together with the second accommodating protrusion 212 of the first sub mold part 210. An effective display area of 310 is defined. It also covers the printed circuit board 330 disposed on the side / back of the backlight assembly 100.

In the conventional method of manufacturing a liquid crystal display device, first, the backlight assembly and the mold frame are combined, the liquid crystal panel is fixed on the upper part, and the upper storage container is combined with the mold frame to complete the liquid crystal display device. In contrast, the liquid crystal display according to the present invention combines the backlight assembly and the mold frame, and accommodates the liquid crystal panel by slidingly coupling the liquid crystal panel to the receiving groove of the mold frame to complete the liquid crystal display device. Therefore, in the present invention, the coupling step of the upper storage container is omitted, thereby shortening the manufacturing time of the liquid crystal display and reducing the manufacturing cost.

Although embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains may implement the present invention in other specific forms without changing the technical spirit or essential features thereof. I can understand that. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive.

The liquid crystal display as described above has the effect of shortening the manufacturing time and reducing the manufacturing cost.

Claims (10)

A liquid crystal panel displaying an image; A printed circuit board connected to the liquid crystal panel and supplying a driving signal to the liquid crystal panel; A backlight assembly positioned under the liquid crystal panel to supply light to the liquid crystal panel; And And a mold frame covering the backlight assembly and including a receiving groove formed to insert and fix the liquid crystal panel. According to claim 1, The liquid crystal panel has a rectangular shape including a long side and a short side, and the receiving groove of the mold frame is slidingly coupled along the long side or the short side of the liquid crystal panel. According to claim 1, The mold frame includes a first sub mold frame in which the liquid crystal panel is slid and received, and a second sub mold frame in combination with the first sub mold frame to fix the liquid crystal panel. The method of claim 3, wherein The accommodation groove is formed in the inner sidewall of the first sub-mold frame. The method of claim 3, wherein And the second sub-molded frame covers the printed circuit board on the side of the backlight assembly. The method of claim 3, wherein The second sub mold frame includes a fixed mold part for fixing the liquid crystal panel, and a cover mold part connected to the fixed mold part and covering the printed circuit board that is bent and disposed on a rear surface of the backlight assembly. . A liquid crystal panel for displaying an image, a printed circuit board connected to the liquid crystal panel and supplying a driving signal to the liquid crystal panel, a backlight assembly positioned below the liquid crystal panel to supply light to the liquid crystal panel, and the backlight A mold frame including an assembly, a first sub mold frame having a receiving groove in which the liquid crystal panel is slid, and a second sub mold frame coupled to the first sub mold frame to fix the liquid crystal panel; Preparing; Coupling the first sub mold frame and the backlight assembly; Slidingly coupling the first sub mold frame and the liquid crystal panel; And And combining the first sub mold frame and the second sub mold frame. The method of claim 7, wherein The liquid crystal panel has a rectangular shape including a long side and a short side, and the receiving groove of the mold frame is slidingly coupled along the long side or the short side of the liquid crystal panel. The method of claim 7, wherein And the second sub mold frame covers the printed circuit board disposed on a side surface of the backlight assembly. The method of claim 7, wherein The second sub mold frame includes a fixed mold part for fixing the liquid crystal panel, and a cover mold part connected to the fixed mold part and covering the printed circuit board that is bent and disposed on a rear surface of the backlight assembly. Method of preparation.

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