KR20080049918A - Liquid crystal display device - Google Patents

Abstract

An LCD(Liquid Crystal Display) is provided to increase line efficiency by reducing a width of a flexible PCB and reduce connection faults when a first PCB is connected with the flexible PCB. A first PCB(Printed Circuit Board) is connected to an LC panel, and includes first and second connection pads arranged in parallel. One side of a flexible PCB(300) is connected to the first PCB. A second PCB is connected with the other side of the flexible PCB. The flexible PCB includes a first insulating film(310) where first lines(410_1,410_2) are formed, and a second insulating film(320). In the second insulating film, a second line(420) connected with one group of lines among the first line through a via(510,520) is formed. The second insulating film exposes both ends of the first line. One-ends of the first and second lines are respectively connected to the first and second connection pads. The first line includes a first line pad(610) having a width bigger than the first line. The second line includes a second line pad(620) having a width wider than the second line.

Description

Liquid crystal display device

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

2 is an exploded perspective view of a flexible printed circuit board included in a liquid crystal display according to a first exemplary embodiment of the present invention.

3 is a cross-sectional view of the flexible printed circuit board taken along the line AA ′ of FIG. 2.

4 is a cross-sectional view of the flexible printed circuit board taken along the line BB ′ of FIG. 2.

5 is a perspective view of a first printed circuit board included in a liquid crystal display according to a first embodiment of the present invention.

6 is a perspective view illustrating a coupling relationship between a flexible printed circuit board and a first printed circuit board included in a liquid crystal display according to a first exemplary embodiment of the present invention.

7 is a perspective view illustrating a coupling relationship between a flexible printed circuit board and a second printed circuit board included in the liquid crystal display according to the first exemplary embodiment of the present invention.

8 is an exploded perspective view of a flexible printed circuit board included in a liquid crystal display according to a second exemplary embodiment of the present invention.

FIG. 9 is a cross-sectional view of the flexible printed circuit board taken along the line CC ′ of FIG. 8.

FIG. 10 is a cross-sectional view of the flexible printed circuit board taken along the line DD ′ of FIG. 8.

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

100: liquid crystal display 111: first substrate

113: second substrate 113: liquid crystal panel

120: lamp 130: diffusion plate

140: optical sheet 150: mold frame

160: reflective sheet 170: bottom chassis

180: top chassis 210: first printed circuit board

211: first connection pad 212: second connection pad

220: second printed circuit board 222: connector

300, 301: flexible printed circuit board 310, 311: first insulating film

320, 321: second insulating film

410_1, 410_2, 411_1, 411_2: first wiring

420 and 421: second wirings 510, 511, 520, and 521: vias

610 and 611: first wiring pad 620 and 621: second wiring pad

630 and 631: third wiring pad

The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device in which a width of a flexible printed circuit board is reduced and connection failure is reduced.

In general, a liquid crystal display device includes a liquid crystal panel composed of a first substrate, a second substrate facing the first substrate, and a liquid crystal injected between the two substrates, and may be configured by using optical modulation by changing optical characteristics of the liquid crystal. It is a device to display

A plurality of gate lines and a plurality of data lines cross each other on the first substrate, and a thin film transistor and a pixel electrode, which are switching elements, are formed in each of the crossed regions. In order to apply a driving signal to a data line and a gate line of the first substrate, a driving signal is applied to a printed circuit board (PCB) having various semiconductor elements and components mounted thereon, and a gate line and a data line. The driver IC to transmit and the liquid crystal panel displaying the information must be interconnected.

Recently, the printed circuit board is separated into a source printed circuit board and a control printed circuit board, respectively, and the source printed circuit board is connected to the data driver of the liquid crystal panel, and the control printed circuit board is a source printed circuit via a flexible printed circuit board. Is connected to the substrate.

Such a flexible printed circuit board includes a plurality of wires for electrical connection between a source printed circuit board and a control printed circuit board, and as more recent high quality liquid crystal display devices are required, more wires may be formed on one flexible printed circuit board. Is required. In order to meet these demands, a liquid crystal display device in which two or more flexible printed circuit boards are adopted or the width of the flexible printed circuit board is expanded has been researched. And the connection of the source printed circuit board is not good.

Therefore, it is necessary to reduce the width of the flexible printed circuit board and to improve the connection between the flexible printed circuit board and the source printed circuit board.

An object of the present invention is to provide a liquid crystal display device in which the width of the flexible printed circuit board is reduced and the connection defect is reduced.

The technical problem of the present invention is not limited to the technical problem mentioned above, 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, there is provided a liquid crystal display device including: a liquid crystal panel; a first printed circuit board connected to the liquid crystal panel and including first and second connection pads arranged side by side; And a flexible printed circuit board having one side connected to the first printed circuit board and a second printed circuit board connected with the other side of the flexible printed circuit board, wherein the flexible printed circuit board includes: a first wiring; 1 insulating film; And a second insulating film through which vias are connected to a group of wirings among the first wirings to expose both ends of the first wirings;

One end of the first and second wirings is connected to the first and second connection pads, respectively.

According to another aspect of the present invention, there is provided a liquid crystal display device including: a liquid crystal panel; a first printed circuit board including first and second connection pads connected to the liquid crystal panel and arranged side by side; And a flexible printed circuit board having one side connected to the first printed circuit board and a second printed circuit board connected with the other side of the flexible printed circuit board, wherein the flexible printed circuit board includes: a first wiring; 1 insulating film; And a second insulating film formed through the via, the second wiring being connected to a group of the first wirings, and having one end of the second wiring protruding from one end of the first insulating film. One end of the first and second wirings is connected to the second and first connection pads, respectively.

Specific details of other embodiments are included in the detailed description and the 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 can be implemented in various different forms, and only the embodiments make the disclosure of the present invention complete, and the general knowledge in the art to which the present invention belongs. It is provided to fully inform the person having the scope of the invention, which is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

Hereinafter, the liquid crystal display according to the first exemplary embodiment of the present invention will be described in detail with reference to FIGS. 1 to 7.

1 is an exploded perspective view of a liquid crystal display according to a first exemplary embodiment of the present invention. Referring to FIG. 1, the liquid crystal display 100 according to the first exemplary embodiment of the present invention is generally viewed as a liquid crystal panel assembly 110, a lamp 120, a diffusion plate 130, an optical sheet 140, and a mold. The frame 150, the reflective sheet 160, the bottom chassis 170, and the top chassis 180 are included.

Here, the liquid crystal panel assembly 110 includes a liquid crystal panel 113 including a first substrate 111 and a second substrate 112, a first printed circuit board 210, a second printed circuit board 220, and a flexible substrate. A printed circuit board 300 and the like.

The liquid crystal panel 113 serves to display an image, and a liquid crystal layer (not shown) formed between the first substrate 111, the second substrate 112, and the first substrate 111 and the second substrate 112. It includes.

The first substrate 111 includes a plurality of gate lines (not shown) having a predetermined interval and extending in a first direction, and a plurality of data lines extending in a second direction so as to cross the gate line and arranged at regular intervals (not shown). A pixel electrode (not shown) formed in a matrix in a pixel region defined by the gate line and the data line, and a thin film transistor (not shown) which transfers the signal of the data line to each pixel electrode by switching the signal of the gate line. ) Is formed.

The second substrate 112 is provided with a light blocking pattern for blocking light in portions other than the pixel region, an RGB color filter pattern for expressing color colors, and a common electrode for implementing an image.

Such 1st board | substrate 111 and the 2nd board | substrate 112 are joined by sealant, frit glass, etc. in the state in which the fixed space | interval was maintained by the spacer. A liquid crystal layer having optical anisotropy is formed between the first and second substrates 111 and 112.

A first printed circuit board (PCB) 210 is electrically connected to one side of the liquid crystal panel 113 by the data tape carrier package 115. In addition, a driving IC for driving the liquid crystal panel 113 is mounted in the center portion of the data tape carrier package 115. The gate tape carrier package 114 is connected to the gate line of the first substrate 111 to provide driving and control signals.

In addition, the first printed circuit board 210 includes a plurality of electronic components that generate driving and control signals of the liquid crystal panel 113. The first printed circuit board 210 is interposed between the top chassis 180 and the sidewalls of the bottom chassis 170.

The second printed circuit board 220 is electrically connected to the first printed circuit board 210 by the flexible printed circuit board 300.

Like the first printed circuit board 210, the second printed circuit board 220 includes a plurality of electronic components that generate driving and control signals of the liquid crystal panel 113. Therefore, the driving and control signals of the liquid crystal panel 113 generated by the second printed circuit board 220 are provided to the first printed circuit board 210 through the flexible printed circuit board 300, and the liquid crystal panel 113 is provided. The driving and control signals of are provided to the liquid crystal panel 113 through the data tape carrier package 115 connected to the first printed circuit board 210.

The second printed circuit board 220 is disposed on the bottom of the bottom chassis 170 and is protected by a protective cover. In this way, the first printed circuit board 210 and the second printed circuit board 220 are separated, and important components are disposed on the second printed circuit board 220 disposed on the bottom of the bottom chassis 170. Accordingly, even when the components mounted on the first printed circuit board 210 are required to be repaired, the second printed circuit board 220 can be easily repaired without disassembling the liquid crystal display device 100.

The flexible printed circuit board 300 electrically connects the first printed circuit board 210 and the second printed circuit board 220.

The liquid crystal display 100 may include a lamp 120 that emits light, and the lamp 120 may use a light emitting diode (LED), a cold cathode fluorescent lamp (CCFL), an external electrofluorescent lamp (EEFL), or the like. Can be. The lamps 120 are spaced at a uniform distance and are connected in phase in parallel, and may be configured in a direct type or an edge type, and are received in the bottom chassis 170.

The diffusion plate 130 may be disposed above the lamp 120, may be provided in a flat plate shape, and the diffusion material may be dispersed. The diffusion plate 130 serves to make the luminance of the light emitted from the lamp 120 uniform.

A plurality of optical sheets 140 are disposed on the diffuser plate 130. The optical sheet 140 serves to diffuse and collect light transmitted from the lamp 120. The optical sheet 140 includes a diffusion sheet, a first prism sheet, a second prism sheet, and the like.

The mold frame 150 has a rectangular frame shape, for example, and includes a locking step formed along the sidewall, and serves to support the liquid crystal panel 113 described above, and is accommodated in the bottom chassis 170.

The reflective sheet 160 has a reflective surface disposed under the lamp 120 and reflecting light emitted to the bottom of the lamp 120 upward.

The bottom chassis 170 may have, for example, a rectangular shape, and sidewalls are formed along edges of the upper surface such that the lamp 120, the diffusion plate 130, the optical sheet 140, and the mold frame 150 are described in the sidewalls. ) And the reflective sheet 160.

The bottom chassis 170 may be coupled to the top chassis 180 through hook coupling (not shown) and / or screw coupling (not shown). In addition, the combination of the top chassis 180 and the bottom chassis 170 may be modified in various forms.

The top chassis 180 is formed in a rectangular frame shape, for example, and protects the liquid crystal panel assembly 110, the lamp 120, and the like, and is seated and fixed to the bottom chassis 170.

Hereinafter, the flexible printed circuit board 300 of the present embodiment will be described in detail with reference to FIGS. 2 to 4. 2 is an exploded perspective view of a flexible printed circuit board included in a liquid crystal display according to a first exemplary embodiment of the present invention. 3 is a cross-sectional view of the flexible printed circuit board taken along the line AA ′ of FIG. 2. 4 is a cross-sectional view of the flexible printed circuit board taken along the line BB ′ of FIG. 2.

2 to 4, the flexible printed circuit board 300 may include the first wirings 410_1 and 410_2 through the first insulating film 310 and the vias 510 and 520 on which the first wirings 410_1 and 410_2 are formed. ) Is formed of a second insulating film 320 having a second wiring 420 connected to a group of wirings 410_1. That is, the flexible printed circuit board 300 of the present embodiment has a partial multilayer wiring structure.

The first insulation film 310 and the second insulation film 320 are formed by forming a conductor pattern on one surface of a film having flexibility and insulation, for example, a film having a polyimide material, and may transmit an electrical signal. First and second wirings 410_1 and 410_2 and a second wiring 420 are formed by a plurality of signal lines.

First wirings 410_1 and 410_2 are formed on the first insulating film 310. The group of wirings 410_1 of the first wirings 410_1 and 410_2 are formed to extend from the other side of the first insulating film 310 to be connected to the second printed circuit board 220 to the center portion of the first insulating film 310. do. The group of wires 410_1 of the first wires 410_1 and 410_2 are electrically connected to the second wires 420 through vias 510 and 520 formed to penetrate the second insulating film 320 to be described later. Accordingly, other groups of wirings 410_2 and second wirings 420 are formed from the central portions of the first insulating film 310 and the second insulating film 320 to one end of the first wirings 410_1 and 410_2 to form a multilayer structure. To achieve. The other group of wirings 410_2 except for the group of wirings 410_1 of the first wirings 410_1 and 410_2 extend from one end of the first insulating film 310 to the other end. From the center portion of the first insulating film 310 to the other end, one group of wirings 410_1 and the other group of wirings 410_2 of the first wirings 410_1 and 410_2 are formed in a single layer, and the wiring is formed on the second insulating film 320. Not formed. The other ends of the first wires 410_1 and 410_2 are connected to the second printed circuit board 220. One group of the wirings 410_1 of the first wirings 410_1 and 410_2 may be formed of, for example, 46 wiring patterns, and another group of the wirings 410_2 of the first wirings 410_1 and 410_2 may have the same number of wiring patterns. Can be done.

The first insulating film 310, a first printed circuit board (refer to 210 in Fig. 1) once the width of connecting to (w ₁₎ is a second printed circuit board (see 220 in FIG. 1) width of the other end connected to the ( w ₂ ) may be narrower. The length of the first insulating film 310 may be shorter than the second insulating film 320. That is, one end of the first insulating film 310 protrudes by a predetermined length L ₁ from the second insulating film 320 disposed below, and the other end of the first insulating film 310 also has a second insulating film ( It protrudes by a predetermined length L _{2 from} 320, so that both ends of the first wirings 410_1 and 410_2 formed in the first insulating film 310 are exposed.

The first wirings 410_1 and 410_2 may be formed to have a thickness of, for example, about 5 to 20 μm, and a metal material such as copper foil (Cu) is generally used, and preferably, tin, on the surface of the copper foil, Plating of gold, nickel or solder is performed.

A method of forming copper foil, which is an example of the first wirings 410_1 and 410_2, may be casting, laminating, electroplating, or the like. Here, casting is a method of thermal curing by spraying a liquid base film on a rolled copper foil, laminating is a method of placing a rolled copper foil on a base film and thermocompression bonding. In addition, electroplating is a method of forming a copper foil by depositing a copper seed layer on the base film and then putting the base film into an electrolyte in which copper is melted and flowing electricity. Here, the wiring patterned on the copper foil is formed to constitute a predetermined circuit by performing a photo / etching process on the copper foil and selectively etching the copper foil.

The first wirings 410_1 and 410_2 may be formed on one surface, for example, a bottom surface of the first insulating film 310, and the first wirings 410_1 and 410_2 may be formed on the surface thereof by the second insulating film 320. Protected. However, both ends of the first wirings 410_1 and 410_2 are exposed for connection with the first printed circuit board and the second printed circuit board.

A first wiring pad 610 is formed at one end of the first wirings 410_1 and 410_2 to connect with the first printed circuit board, and a third wiring pad 630 is formed at the other end of the first wirings 410_1 and 410_2. And a second printed circuit board. The first wiring pad 610 and the third wiring pad 630 are formed to have a width wider than the width of the first wirings 410_1 and 410_2 to reduce the resistance, and substantially the first wiring pads 610 and 410_2. It may be made of the same material.

The second insulating film 320 is attached to the first insulating film 310 to expose both ends of the first wirings 410_1 and 410_2. The second insulating film 320 is made of substantially the same material as the first insulating film 310, and has a shorter length than the first insulating film 310.

A second wiring 420 having a material and a thickness substantially the same as those of the first wirings 410_1 and 410_2 is formed on the bottom surface of the second insulating film 320. The second wiring 420 extends from one end of the second insulating film 320 to the center portion. Vias 510 and 520 penetrating through the second insulating film 320 are formed in the center portion of the second insulating film 320, and the second wiring 420 is connected to the first insulating film through the vias 510 and 520. It is connected to the first wirings 410_1 and 410_2 formed in the 310. The vias 510 and 520 may be made of substantially the same material as the first and second wirings 410_1 and 410_2 and 420. A second wiring pad 620 having a width wider than that of the second wiring 420 is formed at one end of the second wiring 420 so as to be connected to the first printed circuit board. The second wiring pad 620 may be made of substantially the same material as the second wiring 420.

On the other hand, an insulating protective film (not shown) covering the second wiring 420 is formed to protect the second wiring 420 from external impact or corrosion. As the insulating protective film, a solder resist may be representatively used. In this case, one end of the second wiring 420 is exposed without being covered with solder resist in order to connect with the first printed circuit board.

5 to 7, the flexible printed circuit board 300, the first printed circuit board 210, the second printed circuit board 220, and a coupling relationship thereof according to the present embodiment will be described. 5 is a perspective view of a first printed circuit board included in a liquid crystal display according to a first embodiment of the present invention. 6 is a perspective view illustrating a coupling relationship between a flexible printed circuit board and a first printed circuit board included in a liquid crystal display according to a first exemplary embodiment of the present invention. 7 is a perspective view illustrating a coupling relationship between a flexible printed circuit board and a second printed circuit board included in the liquid crystal display according to the first exemplary embodiment of the present invention.

Referring to FIG. 5, a plurality of components are mounted on the first printed circuit board 210 to transmit a driving signal to a liquid crystal panel (see 113 of FIG. 1). The first printed circuit board 210 includes a first connection pad 211 and a second connection pad 212 to be connected to the flexible printed circuit board 300.

The first connection pads 211 may be arranged in a line along one side of one surface of the first printed circuit board 210. The second connection pads 212 may be arranged in a line inside the first printed circuit board 210 than the first connection pads 211, and may be arranged in parallel with the first connection pads 211. As the first connection pad 211 and the second connection pad 212 are arranged side by side, the width of one end of the flexible printed circuit board 300 may decrease. However, the arrangement of the first connection pads 211 and the second connection pads 212 is not limited thereto, and they may be alternately arranged.

One end of the first wirings 410_1 and 410_2 formed on the first insulating film 310, specifically, the first wiring pad 610 is connected to the first connection pad 211, and the second connection pad 212 is connected to the first connection pad 211. One end of the second wiring 420 formed on the second insulating film 320, specifically, the second wiring pad 620 is connected. As described above, since the first insulating film 310 is formed longer than the second insulating film 320, and the first wirings 410_1 and 410_2 are exposed, the first wiring pad 610 and the second wiring are exposed. The pad 620 may be connected to the first connection pad 211 and the second connection pad 212, respectively. The first wiring pad 610, the second wiring pad 620, and the first connection pad 211 and the second connection pad 212 may be connected by, for example, a soldering method.

The soldering method is performed by aligning the first wiring pad 610 and the second wiring pad 620 to the first connection pad 211 and the second connection pad 212, respectively, and simultaneously thermally fusion bonding them. Since the width of the circuit board 300 is narrow, thermal fusion efficiency may be increased, and poor connection may be prevented.

As such, when the first wiring pad 610 and the second wiring pad 620 are soldered to the first connection pad 211 and the second connection pad 212, as illustrated in FIG. 6, the first printed circuit board is illustrated. One end of the flexible printed circuit board 300 is connected to 210. In this case, by using the narrow flexible printed circuit board 300, connection failure can be prevented.

As shown in FIG. 7, the flexible printed circuit board 300 may be connected to the second printed circuit board 220 using, for example, a connector 222.

Major components for applying a driving signal are mounted on the second printed circuit board 220 and disposed on the bottom of the bottom chassis (see 170 of FIG. 1). Accordingly, when the major parts need to be repaired, the main parts can be easily repaired without disassembling the liquid crystal display (see 100 of FIG. 1).

The connector 222 is mounted on one side of the second printed circuit board 220, and the connector 222 includes a main body 224 and a cover 226.

The main body 224 is made of synthetic resin and electrically insulated, and one surface of the main body 224 has connection terminals 228 made of a conductive material. These connection terminals 228 are connected to the other ends of the first wirings 410_1 and 410_2 of the flexible printed circuit board 300, specifically, the third wiring pad 630.

The flexible printed circuit board 300 is pressed and fixed by the cover part 226 connected to the main body part 224. Protrusions (not shown) are formed in the connection terminals 228, and insertion grooves (not shown) are formed in the third wiring pad 630, and these are fastened to thereby connect the flexible printed circuit board 300 to the second printed circuit board. It can be firmly fixed to the 220.

Although not shown, the flexible printed circuit board 300 and the second printed circuit board 220 may be coupled using an anisotropic conductive film (ACF) (not shown) in addition to the connector 222. In more detail, the anisotropic conductive film is attached to the plurality of connection terminals 228 formed on the second printed circuit board 220, and the third wiring pad 630 of the flexible printed circuit board 300 is connected to the anisotropic conductive film. After the alignment, the flexible printed circuit board 300 is thermocompressed and attached to the second printed circuit board 220.

Hereinafter, the liquid crystal display according to the second exemplary embodiment of the present invention will be described in detail with reference to FIGS. 8 to 10. 8 is an exploded perspective view of a flexible printed circuit board included in a liquid crystal display according to a second exemplary embodiment of the present invention. FIG. 9 is a cross-sectional view of the flexible printed circuit board taken along the line CC ′ of FIG. 8. FIG. 10 is a cross-sectional view of the flexible printed circuit board taken along the line DD ′ of FIG. 8. For convenience of description, members having the same functions as the members shown in the drawings of the first embodiment are denoted by the same reference numerals, and therefore description thereof is omitted. In the liquid crystal display according to the present exemplary embodiment, positions and lengths of the first insulating film 311 and the second insulating film 321 are different.

In the liquid crystal display according to the present exemplary embodiment, the first printed circuit board (not shown) connected to the liquid crystal panel (not shown) and the flexible printed circuit board 300 connected to one side of the first printed circuit board 210 are connected to the liquid crystal panel (not shown). And a second printed circuit board 220 connected to the other side of the flexible printed circuit board 300.

8 to 10, in the flexible printed circuit board 300 according to the present exemplary embodiment, a second insulating film 321 having a second wiring 421 formed on one surface thereof is disposed on an upper side thereof, and a first insulating film below the second conductive film 321. 311 is disposed. That is, the second insulating film 321 is disposed on the viewer side, and the first insulating film 311 is disposed on the bottom chassis (not shown) side.

The second wiring 421 is formed on the second insulating film 321. The width w ₁ of one end of the second insulating film 321 may be narrower than the width w ₂ of the other end. The second wiring 421 extends from one end of the second insulating film 321 to the center portion, and is a group of the first wirings 411_1 and 411_2 of the first insulating film 311 through vias 511 and 521 described later. Is connected to the wiring 411_1. One end of the second wiring 421 is formed with a second wiring pad 621 that is wider than the second wiring 421.

The second wiring 421 is covered and protected by the first insulating film 311. However, one end of the second wiring 421, that is, the second wiring pad 621 is not covered by the first insulating film 311 and is exposed to the outside and connected to the first printed circuit board.

A group of first wirings 411_1 and 411_2 are formed in the first insulating film 311. The group of wirings 411_1 of the first wirings 411_1 and 411_2 extend from the other end of the first insulating film 311 to the center portion, and the wiring 411_2 of the other group of the first wirings 411_1 and 411_2 is the first. It extends from one end of the insulating film 311 to the other end. A first wiring pad 611 is formed at one end of the first wirings 411_1 and 411_2, and a third wiring pad 631 is formed at the other end thereof to be connected to the first printed circuit board and the second printed circuit board, respectively. The widths of the first wiring pad 611 and the third wiring pad 631 are formed to be wider than that of the first wirings 411_1 and 411_2. Vias 511 and 521 are formed in the center portion of the first insulating film 311 so as to penetrate the first insulating film 311. One end 521 of the vias 511 and 521 is disposed on the second insulating film 321. The group of wirings 411_1 of the first wirings 411_1 and 411_2 are connected to the second wiring 421 through the vias 511 and 521.

The length of the first insulating film 311 is shorter than the length of the second insulating film 321. Accordingly, both ends of the second insulating film 321 may protrude by a predetermined length L ₁ ′ and L ₂ ′ from the first insulating film 311 to expose the second wiring 421. Specifically, one end of the second insulating film 321 protrudes from the first insulating film 311 by a predetermined length L ₁ ′, but the second end of the second insulating film 321 is formed by the second wiring 421. Therefore, it may not protrude by a predetermined length L ₂ ′.

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.

As described above, according to the liquid crystal display device according to the present invention, the width of the flexible printed circuit board is reduced to increase the wiring efficiency, and the connection failure when the first printed circuit board and the flexible printed circuit board are connected is reduced.

Claims (8)

Liquid crystal panels; A first printed circuit board connected to the liquid crystal panel and including first and second connection pads arranged side by side; A flexible printed circuit board having one side connected to the first printed circuit board; And A second printed circuit board connected to the other side of the flexible printed circuit board, The flexible printed circuit board may include a first insulating film having a first wiring formed thereon; And a second insulating film through which vias are connected to a group of wirings among the first wirings to expose both ends of the first wirings; One end of the first and second wirings are connected to the first and second connection pads, respectively. According to claim 1, The first wiring includes a first wiring pad that is wider than the first wiring, The second wiring includes a second wiring pad that is wider than the second wiring, And the first and second wiring pads are soldered to the first and second connection pads, respectively. According to claim 1, A group of wires of the first wires are extended from the other side of the first insulating film and connected to the vias, The second wire extends from one side of the second insulating film and is connected to the via. The other group of wirings except for the one group of wirings among the first wirings are formed to extend from one side to the other side of the first insulating film. The method of claim 3, wherein The other end of the first wiring is connected to the second printed circuit board by a connector. Liquid crystal panels; A first printed circuit board connected to the liquid crystal panel and including first and second connection pads arranged side by side; A flexible printed circuit board having one side connected to the first printed circuit board; And A second printed circuit board connected to the other side of the flexible printed circuit board, The flexible printed circuit board may include a first insulating film having a first wiring formed thereon; And a second insulating film formed through the via, the second wiring connecting to one group of the first wirings, and having one end of the second wiring protruding from one end of the first insulating film. One end of the first and second wirings is connected to the second and first connection pads, respectively. The method of claim 5, The first wiring includes a first wiring pad that is wider than the first wiring, The second wiring includes a second wiring pad that is wider than the second wiring, And the first and second wiring pads are soldered to the second and first connection pads, respectively. The method of claim 5, A group of wires of the first wires are extended from the other side of the first insulating film and connected to the vias, The second wire extends from one side of the second insulating film and is connected to the via. The other group of wirings except for the one group of wirings among the first wirings are formed to extend from one side to the other side of the first insulating film. The method of claim 7, wherein The other end of the first wiring is connected to the second printed circuit board by a connector.

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