KR20110025537A - Backlight unit and liquid crystal display device module using the same - Google Patents

Abstract

PURPOSE: A backlight unit and a liquid crystal display device using the same are provided to partition a plurality of LEDs in first/second partition areas on a PCB and form an input/output port to each partition areas. CONSTITUTION: First and second input/output lines are formed in first and second areas along a longitudinal direction of a light emitting diode printed circuit board(129b). The First and second input/output ports are formed in both ends of first and second input/output lines. A plurality of light emitting diodes is connected to the first and second input/output ports. The light emitting diode printed circuit board applies driving voltage to a plurality of the light emitting diode.

Description

Backlight unit and liquid crystal display device module using the same}

The present invention relates to a liquid crystal display device using an LED as a light source, and more particularly, to provide a liquid crystal display device having a reduced width of a PCB on which an LED is mounted.

Liquid crystal display devices (LCDs), which are used for TVs and monitors due to their high contrast ratio and are advantageous for displaying moving images, are characterized by optical anisotropy and polarization of liquid crystals. The principle of image implementation by

Such a liquid crystal display is an essential component of a liquid crystal panel bonded through a liquid crystal layer between two side-by-side substrates, and realizes a difference in transmittance by changing an arrangement direction of liquid crystal molecules with an electric field in the liquid crystal panel. do.

However, since the liquid crystal panel does not have its own light emitting element, a separate light source is required in order to display the difference in transmittance as an image. To this end, a backlight including a light source is disposed on the back of the liquid crystal panel.

FIG. 1 is a cross-sectional view of a liquid crystal display module using a general LED as a light source, and FIG. 2 is a plan view schematically illustrating the LED assembly of FIG. 1.

As illustrated, a general liquid crystal display module includes a liquid crystal panel 10, a backlight unit 20, a support main 30, a cover bottom 50, and a top cover 40.

The liquid crystal panel 10 is a part that plays a key role in image expression and is composed of first and second substrates 12 and 14 bonded to each other with a liquid crystal layer interposed therebetween.

The backlight unit 20 is provided behind the liquid crystal panel 10.

The backlight unit 20 includes a light source arranged along the longitudinal direction of at least one edge of the support main 30, a white or silver reflecting plate 25 mounted on the cover bottom 50, and the reflecting plate 25. It includes a light guide plate 23 to be seated and a plurality of optical sheets 21 interposed thereon.

The liquid crystal panel 10 and the backlight unit 20 have a top cover 40 surrounding the top edge of the liquid crystal panel 10 and a back surface of the backlight unit 20 in a state where the edges are surrounded by the support main 30 having a rectangular frame shape. Cover cover 50 to cover each is coupled in front and rear are integrated through the support main 30 as a medium.

In addition, reference numerals 19a and 19b denote polarizers attached to the front and rear surfaces of the liquid crystal panel 10 to control the polarization direction of light, respectively.

In this case, the light source of the backlight unit 20 may be a cold cathode fluorescent lamp (CCFL), an external electrode fluorescent lamp (LED), and a light emitting diode (LED). Etc.

Among them, the LED 29a has a tendency to be widely used as a display light source having both small size, low power consumption, high reliability, and the like.

Accordingly, the LED (29a) is mounted on the LED printed circuit board (PCB) (29b, hereinafter referred to as PCB) to form an LED assembly 29, the LED assembly 29 is fixed in position, such as by bonding The light emitted from the plurality of LEDs 29a faces the light incidence portion of the light guide plate 23.

Therefore, the light emitted from each of the LEDs 29a is incident to the light incident portion of the light guide plate 23 and then refracted toward the liquid crystal panel 10 therein, and the light reflected by the reflector 25 is accompanied by a plurality of optical signals. While passing through the sheet 21, it is processed into a more uniform surface light source of high quality and is supplied to the liquid crystal panel 10.

Meanwhile, as shown in FIG. 2, the plurality of LEDs 29a are positioned between the input terminals 27a and 28a and the output terminals 27b and 28b of the input / output wirings 27 and 28 formed on the PCB 29b. The input terminals 27a and 28a and the output terminals 27b and 28b of the input / output wirings 27 and 28 are electrically connected to the LED driving circuits (not shown), and the driving voltage of the LED 29a through the input terminals 27a and 28a. Is authorized.

On the other hand, the LED driving circuit (not shown) that controls the on / off of the LED (29a), such as applying a driving voltage to the LED (29a) is usually in close contact with the back cover (50 in Fig. 1) Therefore, the overall size of the liquid crystal display device is minimized.

Accordingly, the input terminals 27a and 28a and the output terminals 27b and 28b of the input / output wirings 27 and 28 are connected to the PCB 29b so that the plurality of LEDs 29a can be electrically connected from the LED driving circuit (not shown). It is provided on one side and is connected to the LED driving circuit (not shown) on the back of the cover bottom 50 through a flexible cable such as FPC (Flexible cable: 60).

However, such a general LED backlight unit 20 has some problems.

First, a plurality of LEDs (29a) are connected in series to receive a driving voltage at the same time, at this time, the number of LEDs (29a) is provided as the liquid crystal display device becomes larger, for example, the demands of consumers are rapidly increasing In the case of a large 42-inch or larger liquid crystal display device, the total amount of use of the LED 29a exceeds hundreds.

It is very difficult for such a plurality of LEDs 29a to be connected in series to receive a driving voltage at the same time for reasons of power consumption.

Accordingly, the plurality of LEDs 29a are arranged in an array in a predetermined combination and arranged on the PCB 29b, and the LEDs 29a of the array units are connected in series to apply a driving voltage.

Therefore, on the PCB 29b, a plurality of input / output terminals 27a, 27b, 28a, and 28b for applying a driving voltage by connecting the LEDs 29a in an array unit in series should be provided.

Therefore, in addition to the area where the plurality of LEDs 29a are mounted on the PCB 29b, the plurality of input terminals 27a and 28a and the output terminals 27b and 28b are provided as one side of the PCB 29b, thereby providing a plurality of input / output wirings. It should be formed so as to surround the plurality of LEDs 29a so that the 27 and 28 do not overlap each other to one side of the PCB 29b.

Therefore, the input / output wirings 27 and 28 need an area to be formed so that they do not overlap each other, thereby widening the width d1 of the PCB 29b.

As such, when the width d1 of the PCB 29b is widened, it is impossible to reduce the thickness and weight by the PCB 29b, thereby improving the process cost.

In addition, since the LED assembly 29 is erected at one end of the cover bottom 50, the thickness of the backlight unit 20 generally corresponds to the width d1 of the PCB 29b. Thus, when the width d1 of the PCB 29b is widened, it becomes a cause of increasing the thickness of the liquid crystal display.

Therefore, in recent years, the PCB 29b is formed of a plurality of layers in order to reduce the width d1 of the PCB 29b, and thus the plurality of input / output wirings 27 and 28 are via holes (not shown). Although a method of connecting through the introduction has been introduced, which reduces the width d1 of the PCB 29b but increases the thickness of the PCB 29b, this also makes it impossible to reduce the weight of the PCB 29b and improves the process cost. Have

This problem is further exacerbated by implementing a high resolution and high brightness liquid crystal display device.

The present invention aims to improve the efficiency of the LED according to the reduction of the LED input and output wiring while at the same time to facilitate the component area and space.

Moreover, it is a 2nd objective to improve the reliability of a liquid crystal display device.

In order to achieve the above object, the present invention provides a light emitting diode printed circuit board; First and second input / output wires formed in first and second regions defined at both ends in a length direction of the light emitting diode printed circuit board, and first and second ends formed at both ends of the first and second input / output wires. A second input / output end; A plurality of light emitting diodes connected to the first and second input / output terminals; And a light emitting diode driving circuit configured to apply a driving voltage to the plurality of light emitting diodes through a flexible cable electrically connected to the first and second input / output terminals, wherein the first and second input / output terminals include the first and second input and output terminals. Provided is a backlight unit for a liquid crystal display device, which is formed between regions.

The plurality of light emitting diodes connected to the first input / output terminal are connected in series, and the plurality of light emitting diodes connected to the second input / output terminal are connected in series.

In addition, one end of the flexible cable is provided with a connection terminal, the connection terminal of the flexible cable and the first and second input and output terminals are connected by soldering (soldering), the other end of the flexible cable is LED It is connected to the driving circuit.

In addition, the present invention includes a first and second light emitting diode printed circuit board; First and second input / output wires formed along a length direction of the first and second light emitting diode printed circuit boards, and first and second input / output terminals formed at both ends of the first and second input / output wires; A plurality of light emitting diodes connected to the first and second input / output terminals; And a light emitting diode driving circuit configured to apply a driving voltage to the plurality of light emitting diodes through a flexible cable electrically connected to the first and second input / output terminals, wherein the first and second input / output terminals include the first and second input and output terminals. Provided is a backlight unit for a liquid crystal display device which is formed of regions facing each other of a light emitting diode printed circuit board.

In addition, the present invention and the support frame of the rectangular frame shape; A plurality of LEDs are arranged along the longitudinal direction of one edge of the support main, and the plurality of LEDs are mounted in both ends of the first and second regions along the longitudinal direction, and each of the input / output wiring and the input / output wiring for each region is mounted. An LED assembly including a PCB each having an input / output terminal provided at both ends thereof; A backlight unit further comprising a reflecting plate sequentially seated on the support main, a light guide plate seated on the reflecting plate, and an optical sheet seated on the light guide plate; A liquid crystal panel mounted on the backlight unit; A cover bottom configured to be in close contact with the support main back surface; A top cover is formed around the edge of the liquid crystal panel and is assembled to the support main and the cover bottom. The plurality of LEDs are positioned between respective input / output terminals for each region, and the input / output terminals formed for each region are flexible cables. It provides a liquid crystal display device connected to the LED driving circuit through.

As described above, the present invention has the effect of reducing the width of the PCB by mounting a plurality of LEDs divided into the first and second partitions on the PCB and forming the input and output terminals in each partition. have.

Thus, there is an effect that can provide a thin liquid crystal display device.

In addition, the weight and material cost can be reduced, and the reliability of the liquid crystal display device can be improved.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

3 is a view schematically showing an LED assembly according to an embodiment of the present invention.

As shown, the LED assembly 129 includes a plurality of LEDs 129a and a PCB 129b in which the plurality of LEDs 129a are mounted by surface mount technology (SMT) at a predetermined interval. do.

At this time, the PCB 129b includes a power wiring layer (not shown), an insulating layer (not shown), and a PCB base (not shown) on which the input / output wirings 127 and 128 are formed, and the PCB base (not shown) is a power wiring layer ( And an insulating layer (not shown) and other components are mounted on and supported by the upper layer, and the heat generated from the plurality of LEDs 129a is discharged to the bottom side.

The PCB base (not shown) may be formed of a metal having high thermal conductivity such as aluminum (Al) or copper (Cu), or may be coated with a heat transfer material to improve heat dissipation.

Alternatively, a heat sink (not shown) such as a heat sink may be provided on the rear surface of the PCB base (not shown) to receive heat from each of the LEDs 129a to be more efficiently discharged to the outside.

A power wiring layer (not shown) including a plurality of input / output wirings 127 and 128 formed by patterning a conductive material is formed on the PCB base (not shown), and the PCB base (not shown) and the power wiring layer (not shown) are formed. Insulation layer (not shown) is located between the (C) to electrically insulate between the PCB base (not shown) and the input and output wirings (127, 128).

The plurality of LEDs 129a mounted on the PCB 129b are positioned between the input terminals 127a and 128a and the output terminals 127b and 128b which are both ends of the input / output wirings 127 and 128 formed on the PCB 129b. The power is supplied to the light.

In particular, the plurality of LEDs 129a of the present invention are mounted on the PCB 129b in two divided areas DA1 and DA2.

Here, the partitions DA1 and DA2 serve as a reference for distinguishing the electrical connection relationship between the plurality of LEDs 129a disposed on the partitions DA1 and DA2. That is, the plurality of LEDs 129a are disposed in the respective partitions DA1 and DA2 and connected in series with each other.

In this case, the plurality of LEDs 129a disposed in each of the divided areas DA1 and DA2 are connected to the LED driving circuits (not shown) through separate input / output terminals 127a, 127b, 128a, and 128b, respectively, to generate driving voltages. The on / off of the LED 129a is controlled.

That is, the plurality of LEDs 129a are positioned between the input terminals 127a and 128a and the output terminals 127b and 128b of the input / output wirings 127 and 128 formed on the PCB 129b, so that the plurality of LEDs 129a are disposed in the LED driving circuit (not shown). On / off is controlled by this, wherein the input / output terminals 127a, 127b, 128a, and 128b of the input / output wirings 127 and 128 are formed for each divided area DA1 and DA2.

At this time, the input / output wirings 127 and 128 formed in each of the divided regions DA1 and DA2 are formed so as not to overlap each other, and the input / output terminals 127a and 127 of the input / output wirings 127 and 128 formed in the respective divided regions DA1 and DA2. 127b, 128a, and 128b are assembled between two divided areas DA1 and DA2 for easy electrical connection with an LED driving circuit (not shown).

Here, the LED driving circuit (not shown) for controlling the on / off of the LED 129a, such as applying a driving voltage to the LED 129a, is usually in close contact with the back cover (not shown) and the liquid crystal display. This will minimize the overall size of the device.

Therefore, a flexible cable 160 for electrical connection is provided between the input / output terminals 127a, 127b, 128a, and 128b on the PCB 129b and the LED driving circuit (not shown), and one end of the flexible cable 160 is provided. A connection terminal (not shown) is configured to be directly connected to the input / output terminals 127a, 127b, 128a, and 128b by soldering.

That is, the flexible cable 160 extends from the region between the divided areas DA1 and DA2 of the PCB 129b to the back cover bottom (not shown), so that the plurality of LEDs 129a and the back cover (not shown) are back. LED driving circuits (not shown) are electrically connected to each other.

Therefore, the area where the input / output wirings 127 and 128 are to be formed is reduced compared to the PCB (29b of FIG. 2) having the input / output terminals 27a, 27b, 28a, and 28b of FIG. ), The entire width d2 is reduced compared to the existing width d1 of FIG. 2 (d1 > d2).

As shown in FIG. 4A and FIG. 4B, as an example, six LEDs are mounted on a PCB, so that the present invention will be described in detail.

As illustrated, when the first to sixth LEDs 200a, 200b, 200c, 200d, 200e, and 200f are mounted at predetermined intervals on the PCBs 300a and 300b, the first and third LEDs 200a are mounted. , 200c and the fifth LED 200e are connected to the input / output wiring 127 of the first input terminal 127a, the first output terminal 127b is connected to the fifth LED 200e, and the second and fourth The LEDs 200b and 200e and the sixth LED 200f are connected to the input / output wiring 128 of the second input terminal 128a, and the second output terminal 128b is connected to the sixth LED 200f.

Here, when the first and second input terminals 127a and 128a and the first and second output terminals 127b and 128b are provided as one side of the PCB 300a as shown in FIG. 4A, the PCB 300a is at least Only the first width d1 may be formed so that the input / output wires 127 and 128 of the first and second input / output terminals 127a, 127b, 128a, and 128b do not overlap each other.

At this time, the minimum line width of the input / output wirings 127 and 128 of the input / output terminals 127a, 127b, 128a, and 128b and the minimum distance between the wirings are about 0.2 to 0.4 mm.

Therefore, when LEDs 200a, 200b, 200c, 200d, 200e, and 200f having a width × length of 3 mm × 2 mm are mounted on the PCB 300a, at least four input / output wirings 127 on the PCB 300a are provided. The width d1 of the PCB 300a is formed by enclosing the LEDs 200a, 200b, 200c, 200d, 200e, and 200f so that the LEDs 128 do not overlap each other. In addition to the area (2mm) occupied by the 200e, 200e, and 200f, the minimum distance between the area where the minimum line width of the I / O lines 127 and 128 of the I / O terminals 127a, 127b, 128a, and 128b is to be formed and the I / O lines 127 and 128 are formed. An area of 1.2 mm to 2.4 mm to be formed should be secured.

That is, the first width d1 of the PCB 300a of FIG. 4A is 3.2 to 4.4 mm.

However, as shown in FIG. 4B, a plurality of LEDs 200a, 200b, 200c, 200d, 200e, and 200f are divided into first and second partitions DA1 and DA2 and mounted according to an exemplary embodiment of the present invention. The input / output terminals 127a, 127b, 128a, and 128b of the input / output wirings 127 and 128 are formed for each of the divided areas DA1 and DA2 so that the first to third LEDs 200a, 200b, The second input / output terminal 127 of the first input / output terminals 127a and 127b connected to the 200c and the second input / output terminal connected to the fourth to sixth LEDs 200d, 200e, and 200f of the second divided area DA2 ( When the input / output wiring 128 of 128a and 128b is collected between two divided areas DA1 and DA2, the PCB 300b has a second width d2 smaller than the first width (d1 in FIG. 4A). Even if it is configured, the input and output wirings 127 and 128 of the first and second input / output terminals 127a, 127b, 128a, and 128b may be formed so as not to overlap each other.

That is, only two input / output wires 127 of the first input / output terminals 127a and 127b connected to the first to third LEDs 200a, 200b, and 200c are required in the first partition DA1. In addition, only two input / output wirings 128 of the second input / output terminals 128a and 128b connected to the fourth to sixth LEDs 200d, 200e, and 200f are required in the second division DA2.

Therefore, the minimum line width of the I / O lines 127 and 128 and the minimum distance between the I / O lines 127 and 128 of the input / output terminals 127a, 127b, 128a, and 128b are about 0.2 to 0.4 mm, and the width × length are 3 mm × When 2 mm LEDs 200a, 200b, 200c, 200d, 200e, and 200f are mounted on the PCB 300b, the width d2 of the PCB 300b is determined by the LEDs 200a, 200b, 200c, 200d, 200e, and 200f. In addition to the area (2mm) occupied by 0.6 mm, the minimum gap between the area where the minimum line width of the input / output wirings 127 and 128 of the input / output terminals 127a, 127b, 128a, and 128b are formed and the input / output wirings 127 and 128 are formed is 0.6 mm. Only an area of ~ 1.2mm is needed.

That is, the second width d2 of the PCB 300b of FIG. 4B is 2.6 to 3.2 mm, and may be configured to be about 0.6 to 1.2 mm smaller than the first width d1 of the PCB 300a of FIG. 4A.

Therefore, the area where the input / output wirings 127 and 128 are to be formed is reduced compared to the PCB (300a of FIG. 4A) having the input / output terminals 127a, 127b, 128a, and 128b on one side of the existing side, so that the entire PCB 300b is formed. The width of d2 is reduced compared to the existing width (d1 of FIG. 4a). (D1> d2)

This may result in light weight and material cost reduction of the PCB 300b in which the PCB base is made of a metal material.

In addition, when the input / output terminals 127a, 127b, 128a, and 128b are provided on one side of the PCB 300a, the input / output wiring connecting the plurality of LEDs 200a, 200b, 200c, 200d, 200e, and 200f as in the related art ( The longer the 127, 128, the more susceptible to noise and the like, which may cause a problem that the efficiency of the LEDs 200a, 200b, 200c, 200d, 200e, and 200f may be degraded. This problem can be prevented by being formed by dividing into two divided areas DA1 and DA2 on the PCB 300b.

In addition, a plurality of LEDs 200a, 200b, 200c, 200d, 200e, and 200f mounted in two partitions DA1 and DA2 may be controlled for each partition DA1 and DA2. Compared with this, the driving voltage can be lowered.

That is, since a plurality of LEDs 200a, 200b, 200c, 200d, 200e, and 200f must all be driven through voltages applied only on one side of the PCB (300a of FIG. 4A), the driving voltage thereof is high, but the present invention As described above, by controlling the plurality of LEDs 200a, 200b, 200c, 200d, 200e, and 200f through two partitions DA1 and DA2, the lengths of the input / output wirings 127 and 128 are shorter than before. As a result, the resistance is also lowered, thereby lowering the driving voltage.

Through this, the reliability of the liquid crystal display device is improved, and product yield is improved.

The PCB 300b is obtained in the form of being erected at one end of the liquid crystal display cover bottom (not shown), and the overall thickness of the liquid crystal display can be reduced by reducing the width d2 of the PCB 300b. A liquid crystal display device can be provided.

5 is an exploded perspective view of a liquid crystal display including a PCB according to an embodiment of the present invention.

As illustrated, the liquid crystal display device includes a liquid crystal panel 110, a backlight unit 120, a support main 130, a cover bottom 150, and a top cover 140.

First, the liquid crystal panel 110 plays a key role in image expression and includes a first substrate 112 and a second substrate 114 bonded to each other with the liquid crystal layer interposed therebetween.

At this time, although not shown in the drawings under the premise of an active matrix method, a plurality of gate lines and data lines intersect each other and a pixel is defined on an inner surface of the first substrate 112, which is commonly referred to as a lower substrate or an array substrate. Thin film transistors (TFTs) are provided at the intersections of the transistors and are in one-to-one correspondence with transparent pixel electrodes formed in each pixel.

In addition, the inner surface of the second substrate 114 called the upper substrate or the color filter substrate may correspond to each pixel, for example, a color filter of red (R), green (G), and blue (B) color, and each of them. A black matrix covering the non-display elements such as gate lines, data lines, and thin film transistors is provided. In addition, a transparent common electrode covering them is provided.

A polarizer (not shown) for selectively transmitting only specific light is attached to the outer surfaces of the first and second substrates 112 and 114, respectively.

In addition, the printed circuit board 117 is connected through at least one edge of the liquid crystal panel 110 through a connecting member 116 such as a flexible circuit board or a tape carrier package (TCP). The side surface of the support main 130 or the cover bottom 150 is properly folded to be in close contact.

Accordingly, in the liquid crystal panel 110 having the above-described structure, when the thin film transistor selected for each gate line is turned on by the on / off signal of the gate driver circuit which is scanned and transmitted, the signal voltage of the data driver circuit is applied to the corresponding pixel through the data line. The direction of the liquid crystal molecules is changed by the electric field between the pixel electrode and the common electrode.

In addition, the liquid crystal display module according to the present invention is provided with a backlight unit 120 for supplying light from the rear surface of the liquid crystal panel 110 so that the difference in transmittance is expressed to the outside.

The backlight unit 120 includes an LED assembly 129, a white or silver reflector 125, a light guide plate 123 seated on the reflector 125, and a plurality of optical sheets 121 interposed thereon. Include.

The LED assembly 129 described above is located at one side of the light guide plate 123 so as to face the light incident portion of the light guide plate 123, and the LED assembly 129 has a plurality of LEDs 200 and LEDs 200 thereof. It includes a PCB 300b spaced apart from each other.

Although not shown in the drawings, a general liquid crystal display device is equipped with an LED driving circuit (not shown) for controlling the on / off of the LED assembly 129, which is usually the back cover 150 (150) Close contact to minimize the overall size.

In this case, the plurality of LEDs 200 are mounted on the PCB 300b by being divided into first and second divided regions (DA1 and DA2 of FIG. 4B), and the input / output terminals 127a, 127b, 128a, and 128b of FIG. 4B are respectively mounted. It is formed in the divided area | region (DA1, DA2 of FIG. 4B).

At this time, the input and output terminals (127a, 127b, 128a, and 128b of FIG. 4b) formed in each partition (DA1 and DA2 of FIG. 4b) are assembled between the two partitions (DA1 and DA2 of FIG. 4b). It is connected to the LED driving circuit (not shown) on the rear cover cover 150 through 160 of FIG.

Through this, the width of the PCB 300b can be reduced.

The light guide plate 123 evenly spreads the light incident from the LED 200 to a wide area of the light guide plate 123 while propagating through the light guide plate 123 by a plurality of total reflections to provide a surface light source to the liquid crystal panel 110.

The light guide plate 123 may include a pattern of a specific shape on the rear surface to supply a uniform surface light source.

The reflective plate 125 is positioned on the rear surface of the light guide plate 123, and reflects light passing through the rear surface of the light guide plate 123 toward the liquid crystal panel 110 to improve the brightness of the light.

The plurality of optical sheets 121 on the light guide plate 123 include a diffusion sheet and at least one light collecting sheet, and diffuse or condense the light passing through the light guide plate 123 to provide a more uniform surface to the liquid crystal panel 110. Allow the light source to enter.

The liquid crystal panel 110 and the backlight unit 120 are modularized through the top cover 140, the support main 130, and the cover bottom 150. The top cover 140 is the top and side surfaces of the liquid crystal panel 110. A rectangular frame having a cross section bent in a shape of “a” so as to cover an edge thereof is configured to open an entire surface of the top cover 140 to display an image implemented in the liquid crystal panel 110.

In addition, the cover bottom 150 on which the liquid crystal panel 110 and the backlight unit 120 are seated, and which is the basis for assembling the entire structure of the liquid crystal display device module, has a rectangular plate shape and vertically bends its four edges to a predetermined height. Configure.

In addition, the support main 130 having a rectangular frame shape seated on the cover bottom 150 and covering the edges of the liquid crystal panel 110 and the backlight unit 120 may include the top cover 140 and the cover bottom 150. Combined.

Here, the top cover 140 may be referred to as a case top or a top case, the support main 160 may be referred to as a guide panel, a main support, or a mold frame, and the cover bottom 150 may be referred to as a bottom cover.

The liquid crystal display of the present invention as described above is modular in a thin form compared to the conventional liquid crystal display, which will be described in more detail with reference to FIG. 6 below.

FIG. 6 is a cross-sectional view schematically illustrating the modularity of the liquid crystal display of FIG. 5.

As shown, the liquid crystal display of the present invention can be seen that the overall height is reduced compared to the conventional liquid crystal display device, which is reduced the width occupied by the backlight unit 120, more specifically, cover cover 150 This is because the width d2 of the PCB 300b, which is erected at one end of the side, is reduced.

Through this, a thin liquid crystal display device can be provided.

As described above, the plurality of LEDs 200 are divided and mounted on the PCB 300b into the first and second divided regions DA1 and DA2 of FIG. 4B, and the input / output terminals 127a, 127b, 128a, and 128b of FIG. 4B are mounted. ) Is formed in each of the divided regions DA1 and DA2 of FIG. 4B, thereby reducing the width of the PCB 300b.

Accordingly, a thin liquid crystal display device can be provided.

On the other hand, although not shown, in addition to defining a single PCB divided into two partitions, it is also possible to connect the two PCBs each mounted with a plurality of LEDs to the LED driving circuit through a flexible cable. .

The present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the present invention.

1 is a cross-sectional view of a liquid crystal display module using a general LED as a light source.

2 is a plan view schematically showing the appearance of the LED assembly of FIG.

3 is a plan view schematically showing an LED assembly according to an embodiment of the present invention;

4a and 4b are plan views for comparing the width of the present invention and the conventional PCB.

5 is an exploded perspective view of a liquid crystal display device including a PCB according to an embodiment of the present invention.

FIG. 6 is a schematic cross-sectional view of a modular display of the liquid crystal display of FIG. 5; FIG.

Claims (7)

A light emitting diode printed circuit board; First and second input / output wires formed in first and second regions defined at both ends in a length direction of the light emitting diode printed circuit board, and first and second ends formed at both ends of the first and second input / output wires. A second input / output end; A plurality of light emitting diodes connected to the first and second input / output terminals; Light emitting diode driving circuit for applying a driving voltage to the plurality of light emitting diodes through a flexible cable electrically connected to the first and second input and output terminals And the first and second input / output terminals formed as a region between the first and second regions. The method of claim 1, And a plurality of light emitting diodes connected to the first input / output terminal in series. The method of claim 1, And a plurality of light emitting diodes connected to the second input / output terminal. The method of claim 1, A connecting terminal is provided at one end of the flexible cable, and the connecting terminal of the flexible cable and the first and second input / output terminals are connected by soldering. The method of claim 4, wherein The other end of the flexible cable is a backlight unit for a liquid crystal display device connected to the LED driving circuit. First and second light emitting diode printed circuit boards; First and second input / output wiring lines formed along the length direction of the first and second light emitting diode printed circuit boards, and first and second input / output terminals formed at both ends of the first and second input / output wiring lines; A plurality of light emitting diodes connected to the first and second input / output terminals; Light emitting diode driving circuit for applying a driving voltage to the plurality of light emitting diodes through a flexible cable electrically connected to the first and second input and output terminals Wherein the first and second input / output terminals are formed in areas facing each other of the first and second light emitting diode printed circuit boards. A support frame having a rectangular frame shape; A plurality of LEDs are arranged along the longitudinal direction of one edge of the support main, and the plurality of LEDs are mounted in both ends of the first and second regions along the longitudinal direction, and each of the input / output wiring and the input / output wiring for each region is mounted. An LED assembly including a first PCB having input and output terminals provided at both ends thereof; A backlight unit further comprising a reflecting plate sequentially seated on the support main, a light guide plate seated on the reflecting plate, and an optical sheet seated on the light guide plate; A liquid crystal panel mounted on the backlight unit; A cover bottom configured to be in close contact with the support main back surface; The top cover is assembled to the edge of the liquid crystal panel and assembled to the support main and cover bottom Wherein the plurality of LEDs are positioned between respective input / output terminals for each region, and the input / output terminals formed for each region are connected to the LED driving circuit through a flexible cable.

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