KR20120074921A - Liquid crystal display device - Google Patents

Abstract

PURPOSE: A liquid crystal display device is provided to connect one PCB with an LED driving circuit through first and second LED connector PCBs. CONSTITUTION: First and second connector PCB(Printed Circuit Board)s(125a,125b) are placed on two longitudinal edges of a cover bottom(150). An LED assembly(127) includes a plurality of LED(Light Emitting Diode)s(128) and a PCB(200). The LEDs are mounted on the LED assembly. First and second connection portions(210a,210b) are formed on both longitudinal ends of the LED assembly respectively. The first connection portion is connected to the first connector PCB. The second connection portion is connected to the second connector PCB.

Description

[0001] Liquid crystal display device [0002]

The present invention relates to a liquid crystal display device, and more particularly to an array structure of the LED assembly.

Recently, with the development of information technology and mobile communication technology, the development of a display device that can visually display information has been made, and the display device displays an image by a self-luminous display having a large emission characteristic and other external factors. It is classified as non-light-emitting display which can do it.

A non-light emitting display is an example of a liquid crystal display (LCD) device.

Here, since the LCD device does not have a light emitting element, it requires a separate light source. Accordingly, a backlight unit having a light source on the rear surface is provided to irradiate light toward the front of the liquid crystal panel, thereby realizing an identifiable image.

The backlight unit uses a Cold Cathode Fluorescent Lamp (CCFL), an External Electrode Fluorescent Lamp, and a Light Emitting Diode (LED) as a light source.

Among them, LEDs are particularly widely used as light sources for displays with features such as small size, low power consumption, and high reliability.

Meanwhile, a general backlight unit is classified into a side light type and a direct light type according to the arrangement of lamps. In the side light type, one or a pair of lamps is disposed at one side of the light guide plate. It has a structure, or two or two pairs of lamps are arranged on each side of the light guide plate, and the direct-light type has a structure in which several lamps are arranged under the optical sheet.

In recent years, in the state of active research of large-area liquid crystal display devices at the request of consumers, the direct-light type is more suitable for the large-area liquid crystal display device than the side light type.

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

As shown in the drawing, a general liquid crystal display device includes a liquid crystal panel 10 including first and second substrates 12 and 14 and a backlight unit 20 behind the liquid crystal panel 10.

Here, the backlight unit 20 includes a reflector 22, and a plurality of LEDs 28 are arranged side by side on the upper surface thereof, and a plurality of optical sheets 26 are positioned on the LEDs 28.

At this time, the light emitted from two or three adjacent LEDs 28 are overlapped and mixed with each other, and then incident on the liquid crystal panel 10 to provide a surface light source.

The backlight unit 20 and the liquid crystal panel 10 including the LEDs 28 are modularized through the top cover 40, the support main 30, and the cover bottom 50, that is, the liquid crystal panel 10 and the backlight. The top cover 40 covering the front edge of the liquid crystal panel 10 and the cover bottom 50 covering the back surface of the backlight unit 20 with the rectangular main frame support main 30 wrapped around the edge of the unit 20, respectively. Coupled in front and rear is integrated through the support main 30.

Here, the plurality of LEDs 28 are mounted to have a predetermined space on the LED printed circuit board (PCB) (29, hereinafter, PCB), the plurality of LEDs 28 mounted on the PCB 29 is in series Connected to receive the driving voltage at the same time.

Accordingly, the PCB 29 is connected to the connector PCBs 25a and 25b (see FIG. 2) through the connector pins 29a (see FIG. 2) provided at one end thereof, and the connector PCBs 25a and 25b are referred to as FIG. 2. 50 is connected via a LED driving circuit (not shown) and a flexible cable (not shown) provided separately on the back.

FIG. 2 is a plan view schematically illustrating the LEDs arranged on the cover bottom of FIG. 1, and FIG. 3 is a plan view schematically illustrating the arrangement of a plurality of LEDs mounted on the PCB of FIG. 2.

As shown in the drawing, at least two connector PCBs 25a and 25b are provided on the inner surfaces of two edges perpendicular to the longitudinal direction of the cover bottom 50. 29 is composed of two columns in a row direction in the horizontal direction along the longitudinal direction of the cover bottom 50, so that one end provided with the connector pin 29a of each PCB 29 faces the connector PCBs 25a and 25b. It is formed along the inner surface of the bottom 50.

On the other hand, as the liquid crystal display device becomes larger, the number of LEDs 28 provided also increases. For example, in the case of a 55-inch or larger large liquid crystal display device in which consumer demand is rapidly increasing, the total amount of use of the LED 28 exceeds hundreds.

It is very difficult for such a plurality of LEDs 28 to be connected in series at one time to receive a driving voltage for reasons such as power consumption.

Accordingly, the plurality of LEDs 28 arranges a predetermined combination in an array, and arranges them on the PCB 29, so that the LEDs 28 of the array units are connected in series to apply a driving voltage.

That is, as shown in FIG. 3, the plurality of LEDs 28 mounted on the PCB 29 are repeatedly arranged on the PCB 29 in units of an array 28a.

The LED array 28a is positioned between an LED driving circuit (not shown) and an input / output wiring (not shown) electrically connected to the LED array 28a to receive a driving voltage from the LED driving circuit (not shown).

At this time, each LED 28 is connected in series in the LED array 28a.

Each of the LED arrays 28a is controlled by an LED driving circuit (not shown). Since the LED driving circuits (not shown) are separately provided outside, connector PCBs 25a and 25b are connected to one end of the PCB 29. The connector PCBs 25a and 25b and the LED driving circuit (not shown) are connected to each other through a flexible cable (not shown).

In this case, one end of the PCB 29 is provided with a connector pin 29a to connect the PCB 29 and the connector PCBs 25a and 25b.

Here, the connector PCBs 25a and 25b are provided on the inner surfaces of the two edges perpendicular to the longitudinal direction of the cover bottom 50, so that the PCB 29 has a length of about 1/2 the length of the cover bottom 50 in the longitudinal direction. It is formed to have.

However, when the length of the PCB 29 is long, a large number of LED arrays 28a must be densely arranged on the PCB 29, so that the plurality of LED arrays 28a mounted on the PCB 29 are mounted. There is a problem in that the structure of the input / output wirings 23a and 23b for connecting the circuit becomes very complicated.

In addition, there is a problem that it is very difficult to secure space for forming the input / output wirings 23a and 23b.

For example, in the case of a 55-inch liquid crystal display, the number of LEDs 28 mounted on one PCB 29 is 216, and such LEDs 28 form one LED array 28a. .

At this time, the length of the PCB 29 is formed to have a length of about 1/2 of the longitudinal direction of the cover bottom 50, the LED array 28a mounted on the PCB 29 is the length of the PCB 29 Twelve are arranged in a row direction, and three are provided in a column direction that is perpendicular to the PCB 29 longitudinal direction. That is, the LED array 28a is arranged on the PCB 29 in a 12 * 3 arrangement.

Since the LED array 28a must be connected to the input / output wirings 23a and 23b, respectively, the input / output wirings 23a and 23b connected to the connector pins 29a must be formed between each row and the output wiring 23b. ) Is 1mm wide and the width of the input wiring 23a is 0.3mm, the distance d1 between each row is at least 1mm (width of the output wiring 23b) + (0.3mm (input wiring ( Width of 23a) * 12 (number of LED arrays 28a in one row) + 0.4 mm (gap between input wiring 23a and output wiring 23b) + (0.3m * 11) (input wiring ( Spacing between 23a) = 8.3mm.

The distance d2 between the connector pin 29a and the LED array 28a adjacent thereto is at least 1 mm (width of the output wiring 23b) + (0.3 mm (width of the input wiring 23a) * 24 (two Number of LED arrays 28a in a row)) + 0.4 mm (gap between input wiring 23a and output wiring 23b) + (0.3m * 23) (gap between input wiring 23a) = 15.5 mm must be maintained.

That is, in addition to an area in which a plurality of LEDs 28 are mounted on the PCB 29, an area in which such input / output wirings 23a and 23b should be formed should be provided.

Therefore, even if it is desired to provide a liquid crystal display device having a high resolution and high brightness, which is recently required, the number of LEDs 28 cannot be increased.

The present invention has been made to solve the above problems, and a first object of the present invention is to provide a liquid crystal display device having high brightness and high resolution.

In addition, the second object is to improve the efficiency of the LED according to the reduction of the LED input and output wiring to facilitate the component area and space, and to provide a lightweight and thin liquid crystal display device. It is aimed at 3.

In order to achieve the object as described above, the present invention comprises a cover bottom consisting of a horizontal plane and a side; First and second connector PCBs provided at two edges in the longitudinal direction of the cover bottom; A plurality of LEDs and the plurality of LEDs are mounted, and a first and a second connection part are provided at both ends in a longitudinal direction, respectively, the first connection part is connected to the first connector PCB, and the second connection part is connected to the first connector part. An LED assembly comprising a PCB connected with a two connector PCB; Provided is a liquid crystal display including a liquid crystal panel positioned on the LED assembly.

In this case, the LED assembly is provided with a plurality in the longitudinal direction of the cover bottom, each PCB of each LED assembly is arranged in a direction perpendicular to the longitudinal direction of the cover bottom, the plurality of mounted on each PCB The LEDs of the LEDs receive signals from the outside through the first and second connectors PCB, respectively.

The plurality of LEDs mounted on the PCBs may be divided into first and second partitions, and the plurality of LEDs located in the first partitions may include a plurality of input / output wires connected to the first connection part of the PCB. The signal is received through the plurality of LEDs located in the second partition area through a plurality of input and output wiring connected to the second connection portion of the PCB, the plurality of LEDs to the n array of LEDs The unit is mounted in units, and the region where the input / output wiring is to be formed between each LED array is formed to have a space of 4.7 mm to 8.3 mm.

In addition, the PCBs are separated based on the central portion in the longitudinal direction, and include third and fourth connector PCBs on two edges along the longitudinal direction of the cover bottom to be adjacent to the first and second connector PCBs.

At this time, the PCB neighboring each other in the longitudinal direction of the cover bottom is connected to the same one of the first to fourth connector PCB, the first and second connection portion is made of a connector pin.

In addition, the first and second connector PCB is provided in close contact with the horizontal plane, the first and second connector PCB is provided in close contact with the side, the connector PCB at one end of the first and second connector PCB, respectively Connector pins are provided, the first and second connection portion is made of a connector.

In this case, the first and second connector PCB is positioned perpendicular to the PCB, the connector pin for the connector PCB is formed to face the horizontal plane, the connector pin insertion groove for the connector PCB of the connector is perpendicular to the PCB And toward the first and second connector PCBs.

As described above, according to the present invention, the first and second connector pins are provided at both ends in the longitudinal direction of the PCB, and the first and second connector pins are provided at the two edge sides in the longitudinal direction of the cover bottom. By connecting to the second connector PCB, one PCB is connected to the LED driving circuit through the first and second LED connector PCB, thereby preventing the structure of the input and output wiring for connecting the LED array compared to the conventional one. There is an effect that can be, and securing the space for forming the input and output wiring also has an easy effect.

Therefore, the present invention has the effect of mounting a larger number of LEDs without changing the size, it is possible to implement a high brightness and high resolution liquid crystal display device.

In addition, by providing the connector PCB in close contact with the side of the cover bottom, it is possible to reduce the bezel area of the liquid crystal display device, and also to secure more free space of the PCB to mount a larger number of LEDs. It works.

1 is a cross-sectional view of a direct type liquid crystal display device using a general LED as a light source.
FIG. 2 is a plan view schematically showing the LEDs arranged on the cover bottom of FIG. 1; FIG.
3 is a plan view schematically illustrating a state in which a plurality of LEDs mounted on the PCB of FIG. 2 is arranged;
4 is an exploded perspective view illustrating a liquid crystal display according to an exemplary embodiment of the present invention.
5 is a plan view schematically showing the LEDs arranged on the cover bottom of FIG. 4;
6 is a plan view schematically illustrating a state in which a plurality of LEDs mounted on a PCB is arranged.
7 is a plan view schematically showing another embodiment of the LEDs arranged on the cover bottom of FIG. 4;
8A to 8B are cross-sectional views schematically showing a connection between a PCB and a connector PCB according to an embodiment of the present invention.

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

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

As illustrated, the liquid crystal display device 100 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 the first and second substrates 112 and 114 bonded to each other with the liquid crystal layer interposed therebetween.

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

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

The printed circuit boards 118a and 118b are connected to each other along at least one edge of the liquid crystal panel 110 via a connecting member 116 such as a flexible circuit board. 150) It is flipped to the back and adhered.

Although not clearly shown in the drawings, upper and lower alignment layers (not shown) for determining the initial molecular alignment direction of the liquid crystal are interposed between the two substrates 112 and 114 of the liquid crystal panel 110 and the liquid crystal layer. In order to prevent leakage of the liquid crystal layer filled therebetween, a seal pattern is formed along edges of both substrates 112 and 114.

In this case, upper and lower polarizers (not shown) are attached to outer surfaces of the first and second substrates 112 and 114, respectively.

The backlight unit 120 for supplying light is provided on a rear surface of the liquid crystal panel 110 such that a difference in transmittance of the liquid crystal panel 110 is expressed to the outside.

The backlight unit 120 includes a PCB 200 arranged along an inner surface of the cover bottom 150 and a plurality of LEDs 128 mounted on each of them.

In addition, the backlight unit 120 is configured with a plurality of through holes 123 through which a plurality of LEDs 128 can pass, thereby covering the entire inner surface of the PCB 200 and the cover bottom 150 except for the plurality of LEDs 128. A covering white or silver reflective sheet 122 is included.

A diffuser plate 124 and an optical sheet 126 are disposed on the upper portion of the LED 128 exposed through the through hole 123 of the reflective sheet 122 to the upper portion of the plurality of LEDs 128.

Here, the optical sheet 126 may include a diffusion sheet and at least one light collecting sheet, and may include various functional sheets such as a reflective polarizing film called a dual brightness enhancement film (DBEF).

Therefore, the light emitted from the plurality of LEDs 128 passes through the diffusion plate 124 and the optical sheet 126 in turn, and then enters the liquid crystal panel 110. Using this, the liquid crystal panel 110 generates a high luminance image. Will be displayed externally.

In this case, in the backlight unit 120 of the present invention, an LED driving circuit 160 (see FIG. 8A) for controlling on / off of the plurality of LEDs 128 is mounted to the rear of the cover bottom 150. Minimize the overall size.

Accordingly, a flexible cable such as an FPC (170, see FIG. 8A) is provided so that the plurality of LEDs 128 may be electrically connected to the LED driving circuit 160 (see FIG. 8A), and the cover bottom 150 is provided. Connector PCBs 125a and 125b (refer to FIG. 5) are arranged at two edges of the longitudinal direction, and connector pins 210 are provided at both ends of the PCB 200 in the longitudinal direction.

That is, the PCB 200 is connected to the connector PCBs 125a and 125b (see FIG. 5) through the connector pin 210, and the connector PCBs 125a and 125b (see FIG. 5) refer to the flexible cable 170 and FIG. 8A. By using the bending characteristic of the), it is connected to the LED driving circuit 160 (see FIG. 8A) on the back of the cover bottom 150.

In this case, the connector PCBs 125a and 125b (see FIG. 5) are formed at two edges in the longitudinal direction of the cover bottom 150 and are connected to the connector PCBs 125a and 125b (see FIG. 5). Since the pins 210 are provided at both ends in the longitudinal direction of the PCB 200, the PCBs 200 are arranged in a direction perpendicular to the longitudinal direction of the cover bottom 150.

That is, the PCB 200 is arranged in a row direction in the horizontal direction along the longitudinal direction of the cover bottom 150 is a direction perpendicular to the longitudinal direction in which the connector PCB (125a, 125b, see Fig. 5) is arranged.

Accordingly, the PCB 200 is simultaneously connected with the connector PCBs 125a and 125b (see FIG. 5) provided at two edges in the longitudinal direction of the cover bottom 150 to turn on the LEDs 128 at both ends of the PCB 200. The driving voltage for controlling the on / off is applied.

Thus, on the PCB 200 of the present invention, it is possible to prevent the structure of the input / output wirings 221a and 221b connecting the plurality of LEDs 128 to be more complicated than before, and the input / output wirings 221a and 221b. It is also easy to secure a space for forming (see FIG. 6).

Therefore, even though the area of the PCB 200 is not expanded, a larger number of LEDs 128 may be mounted than in the related art.

We will discuss this in more detail later.

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 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, which is the basis for assembling the entire apparatus of the liquid crystal display device 100 by mounting the liquid crystal panel 110 and the backlight unit 120, has a horizontal surface 151 and a side at which the edge thereof is vertically bent. 153 to form a predetermined space in which the backlight unit 120 can be seated.

At this time, a pair of bar-shaped side supports are coupled to opposite edges of the cover bottom. Thus, the side of the cover bottom is formed on the remaining two edges, and is formed to have the same height as the side support.

A support main 130 having a rectangular frame shape seated on the cover bottom 150 and surrounding the edges of the liquid crystal panel 110 and the backlight unit 120 is combined with the top cover 140 and the cover bottom 150.

Meanwhile, the top cover 140 may be referred to as a case top or a top case, the support main 130 may be referred to as a guide panel or a main support, and a mold frame, and the cover bottom 150 may be referred to as a bottom cover.

As described above, the liquid crystal display device 100 of the present invention is connected to the LED driving circuit 160 (refer to FIG. 8A) and the flexible cable 170 (refer to FIG. 8A) mounted on the rear surface of the cover bottom 150. PCB (200a, 125b, see Figure 5) is formed on the two edges in the longitudinal direction of the cover bottom 150, the PCB 200 is provided with the connector pins 210 on both ends in the longitudinal direction of the LED assembly 127 ) Is arranged in a direction perpendicular to the longitudinal direction of the cover bottom 150, it is possible to prevent the structure of the input and output wiring (221a, 221b, see Figure 6) to be complicated, and the input and output wiring (221a, 221b, Figure 6 It is also easy to secure a space for forming. Therefore, even though the area of the PCB 200 is not expanded, a larger number of LEDs 128 may be mounted than in the related art.

FIG. 5 is a plan view schematically illustrating the LEDs arranged on the cover bottom of FIG. 4, and FIG. 6 is a plan view schematically illustrating the arrangement of a plurality of LEDs mounted on the PCB.

As shown in FIG. 5, a plurality of LED assemblies 127 are seated on the cover bottom 150. In the LED assembly 127, a plurality of LEDs 128 are spaced at regular intervals, thereby providing surface mount technology. : Is mounted on the PCB 200 by SMT).

In this case, the plurality of LEDs 128 are repeatedly arranged on the PCB 200 of each LED assembly 127 in units of an array (array: 128a) for implementing white light for reasons of power consumption.

Here, the PCB 200 of each LED assembly 127 is a metal core printed circuit board having a heat dissipation function, and a heat sink (not shown) is provided on the back of the MCPCB 200 to each LED. Heat can be received from 128 and released to the outside.

At this time, the second driving side of the cover bottom 150 in the longitudinal direction of the cover bottom 150 is mounted through the LED driving circuit 160 (see FIG. 8A) and the flexible cable 170 (see FIG. 8A). First and second connector PCBs 125a and 125b are provided, and each PCB 200 of the LED assembly 127 is provided with first and second connector pins 210a and 210b at both ends in the longitudinal direction. The first and second connector pins 210a and 210b provided at both ends of the 200 are formed along the inner surface of the cover bottom 150 to face the first and second connector PCBs 125a and 125b, respectively.

That is, each LED assembly 127 is arranged in plurality so that the PCB 200 is arranged in a direction perpendicular to the longitudinal direction of the cover bottom 150, one PCB 200 is the first and second connector PCB ( 125a and 125b are connected to the LED driving circuit 160 (refer to FIG. 8A).

That is, the plurality of LEDs 128 mounted on one PCB 200 are connected to both ends of the PCB 200 from the LED driving circuit 160 (see FIG. 8A) through the first and second connectors PCBs 125a and 125b. At the same time, the driving voltage is applied.

Referring to this in more detail with reference to Figure 6, as shown in Figure 6, a plurality of LEDs 128 mounted on one PCB 200 is arranged in an array (array: 128a) on the PCB 200 Repeat it.

In this case, the plurality of LED arrays 128a are interposed between the plurality of input / output wires 221a and 221b electrically connected to the first and second connector PCBs 125a and 125b connected to the LED driving circuit 160 (refer to FIG. 8A). Located at, the driving voltage is applied from the LED driving circuit 160 (refer to FIG. 8A).

At this time, each LED 128 is connected in series in the LED array 128a.

Here, the first and second connector pins 210a and 210b are provided at both ends of the PCB 200 in the longitudinal direction, and the first and second connector pins 210a and 210b are formed in two lengthwise directions of the cover bottom 150. It is connected to the first and second connector PCBs 125a and 125b provided on the edge side.

Therefore, substantially one PCB 200 is divided into first and second divisions A and B based on the central portion in the longitudinal direction, where the divisions A and B are corresponding divisions A , B) is a reference for distinguishing the electrical connection relationship of the plurality of LED array 128a disposed on B. That is, the plurality of LED arrays 128a are disposed in the respective partitions A and B and connected to the LED driving circuits 160 (refer to FIG. 8A) through the first and second connector PCBs 125a and 125b, respectively. .

That is, the plurality of LED arrays 128a arranged in the first partition A of the PCB 200 are connected to the first connector PCB 125a through the first connector pin 210a and the first connector PCB. 125a is connected to the LED driving circuit 160 (refer to FIG. 8A). In addition, the plurality of LED arrays 128a arranged in the second partition B of the PCB 200 are connected to the second connector PCB 125b through the second connector pin 210b to be connected to the LED driving circuit 160. , See FIG. 8A).

Therefore, the input / output wirings 221a and 221b for connecting the plurality of LED arrays 128a mounted on the PCB 200 may be managed for each partition area A and B. FIG.

Accordingly, the PCB 200 of the present invention can prevent the structure of the input / output wirings 221a and 221b for connecting the plurality of LED arrays 128a mounted on the PCB 200 to be complicated, and the input / output wiring ( It is also easy to secure a space for forming the 221a, 221b.

That is, the PCB 200 may reduce the area where the input / output wirings 221a and 221b are to be formed, other than the area in which the plurality of LEDs 128 are mounted. Through this, a larger number of LEDs 128 can be mounted on the PCB 200.

For example, in the case of a 55-inch liquid crystal display, the number of LEDs 128 mounted on one PCB 200 is 216, and such LEDs 128 form one LED array 128a. .

The PCB 200 is formed to have a length in a direction perpendicular to the longitudinal direction of the cover bottom 150, and is provided with first and second connector pins 210a and 210b at both ends of the PCB 200 in the longitudinal direction. The PCB 200 is connected to the first and second connector PCBs 125a and 125b respectively formed at two edges in the longitudinal direction of the bottom 150 so that the PCB 200 can be divided into first and second partitions with respect to the central portion in the longitudinal direction. It is divided into (A, B).

Therefore, the LED array 128a is in the longitudinal direction of the PCB 200 in the first partition A on the PCB 200 connected to the LED driving circuit 160 (see FIG. 8A) through the first connector PCB 125a. Six are arranged in a row direction that is perpendicular to, and six are arranged in a column direction that is a longitudinal direction of the PCB 200. That is, the LED array 128a in the first partition A is arranged in a 6 * 6 array on the PCB 200.

Since the LED array 128a must be connected to the input / output wirings 221a and 221b, respectively, the input / output wiring electrically connected to the first connector pin 210a connected to the first connector PCB 125a between each row and the row. 221a and 221b should be formed. When the width of the output wiring 221b is 1 mm and the width of the input wiring 221a is 0.3 mm, the distance d3 between each row is at least 1 mm (output wiring). (221b) width + (0.3mm (width of input wiring 221a) * 6 (number of LED array 128a in one row)) + 0.4mm (between input wiring 221a and output wiring 221b) Spacing) + (0.3m * 5) (gap between input wirings (221a)) = 4.7mm.

In addition, since the input / output wiring lines 221a and 221b corresponding to two rows may be formed at the same time between any one of the rows and the rows, the distance d4 between the rows and the rows is at least 1 mm (output wiring). (221b) width + (0.3mm (width of input wiring 221a) * 12 (number of LED array 128a in two rows)) + 0.4mm (between input wiring 221a and output wiring 221b) Spacing) + (0.3m * 11) (gap between input wiring 221a) = 8.3mm.

In addition, since the input / output wiring lines 221a and 221b corresponding to two rows may also be simultaneously formed between the first connector pin 210a and the LED array 128a adjacent thereto, the interval d5 of the region thereof also maintains 8.3 mm. Should be.

Accordingly, the first partition A of the PCB 200 of the present invention has a spacing d3, d4, d5 between the LED array 128a and the neighboring LED array 128a of at least 4.7 mm to 8.3 mm. You just keep it.

Since the second partition B is also the same, the distance d3, d4, d5 between the LED array 128a mounted on the PCB 200 and the neighboring LED array 128a is at least 4.7 mm. You just need to keep 8.3mm.

This can be seen that can reduce the interval of about 1/2 compared to the conventional had to maintain the interval (d1, d2) of 8.3mm ~ 15.5mm.

Therefore, the PCB 200 of the present invention can prevent the structure of the input / output wirings 221a and 221b for connecting the plurality of LED arrays 128a mounted on the PCB 200 to be complicated compared to the conventional. It is also easy to secure a space for forming the input / output wirings 221a and 221b.

That is, the PCB 200 may reduce the area where the input / output wirings 221a and 221b are to be formed, other than the area in which the plurality of LEDs 128 are mounted.

Therefore, the present invention can mount a larger number of LEDs 128 without changing the size, thereby realizing a high brightness and high resolution liquid crystal display device.

As described above, the liquid crystal display of the present invention provides the first and second connector pins 210a and 210b at both ends of the PCB 200 in the longitudinal direction, and the first and second connector pins 210a and 210b. The PCB 200 is connected to the first and second connector PCBs 125a and 125b provided at two edges in the longitudinal direction of the cover bottom 150 so that one PCB 200 is connected to the first and second LED connector PCBs 125a, By connecting to the LED driving circuit 160 (see FIG. 8A) through 125b, the structure of the input / output wirings 221a and 221b for connecting the LED array (not shown) can be prevented from being complicated. It is also easy to secure a space for forming the input / output wirings 221a and 221b.

Therefore, the present invention can mount a larger number of LEDs 128 without changing the size, thereby realizing a high brightness and high resolution liquid crystal display device.

Meanwhile, as shown in FIG. 7, the LED assembly 127 has two PCBs 200 corresponding to one divided area A and B of FIG. 6 in a direction perpendicular to the longitudinal direction of the cover bottom 150. The dogs are arranged, and it is also possible to allow neighboring PCBs 200 to be connected to one connector PCB 125a and 125b along the longitudinal direction of the cover bottom 150.

8A to 8B are cross-sectional views schematically illustrating a connection between a PCB and a connector PCB according to an embodiment of the present invention.

As illustrated, the reflector plate 122, the plurality of LED assemblies 127 on the reflector plate 122, and the diffuser plate 124 and the plurality of optical sheets 126 are stacked on the LED assembly 127 to form a backlight unit ( 120 in FIG. 4.

At this time, the LED assembly 127 is composed of a PCB 200 having a connector pin 210a (not shown) at both ends in the longitudinal direction and a plurality of LEDs 128 mounted on the PCB 200. Here, the plurality of LEDs 128 are repeatedly arranged on the PCB 200 in units of LED arrays (128a in FIG. 7).

Then, the LED driving circuit 160 for controlling the on / off (on / off) of the LED assembly 127 is mounted, they are usually in close contact with the back cover 150 150 to minimize the overall size.

A liquid crystal panel 110 in which a liquid crystal layer (not shown) is interposed between the backlight unit (120 of FIG. 4) and the first and second substrates 112 and 114 and the first and second substrates 112 and 114 is disposed thereon. On each of the outer surfaces of the substrates 112 and 114, polarizing plates 119a and 119b for selectively transmitting only specific light are attached.

The backlight unit (120 of FIG. 4) and the liquid crystal panel 110 are surrounded by edges by the support main 130, and the cover bottom 150 is coupled to the rear surface of the backlight unit (120) and the upper edge and side surfaces of the liquid crystal panel 110. Wrapping top cover 140 is coupled to the support main 130 and cover bottom 150.

In this case, the cover bottom 150 is composed of a horizontal surface 151 and the side 153 of which the edge is vertically bent upwardly, and a pair of bar-shaped sides with opposite ends of the cover bottom 150 facing each other. Supports (129 in FIG. 4) are combined.

For this reason, the liquid crystal panel 110 and the backlight unit 120 of FIG. 4 are integrally modularized to implement protection from impact and minimization of light loss.

On the other hand, the plurality of LEDs 128 are controlled by the LED driving circuit 160 mounted on the back of the cover bottom 150, the LED driving circuit 160 is covered cover 150 to minimize the mounting area ) Is provided on the back.

Accordingly, in order for the LED 128 mounted on the PCB 200 to be connected to the LED driving circuit 160 provided on the rear surface of the cover bottom 150, two side edges of the cover bottom 150 in the longitudinal direction of the cover bottom 150 are provided. 125a, not shown).

Thus, the PCB 200 is connected to the connector PCB (125a, not shown), the connector PCB (125a, not shown) is an LED drive circuit mounted on the back of the cover bottom 150 through the flexible cable 170 ( 160).

Here, the flexible cable 170 passes through the cover bottom 150 through the inlet hole 155 formed on the side 153 of the cover bottom 150 and is mounted on the rear surface of the cover bottom 150. (Not shown).

In this case, as shown in FIG. 8A, the connector PCB 125a (not shown) may be provided in close contact with the horizontal surface 151 of two edges in the longitudinal direction of the cover bottom 150. In this case, the PCB 200 may be provided. Connector pins (210a, not shown) provided at both ends in the longitudinal direction of the is formed in parallel with the PCB (200).

Therefore, the connector pin 210a (not shown) formed on the PCB 200 is inserted into the connector 121 provided on the connector PCB 125a (not shown), whereby the PCB 200 and the connector PCB 125a (not shown) are inserted. H) are electrically connected to each other.

In addition, as shown in FIG. 8B, the connector PCB 125a (not shown) may be provided in close contact with the side surfaces 153 of the two edges in the longitudinal direction of the cover bottom 150. The connector 310 is provided at both ends, and the connector PCB 125a (not shown) is provided with a connector pin 320 for a connector PCB.

That is, by being provided in close contact with the side 153 of the cover bottom 150, the connector PCB (125a, not shown) is located perpendicular to the PCB 200, the connector pin 320 for the connector PCB is the cover bottom ( The connector 310 provided on the PCB 200 has an insertion groove (not shown) in which the connector pin 320 for the connector PCB is accommodated. 125a, not shown).

Thus, the connector pin 320 for the connector PCB is inserted into the connector 310 provided in the PCB 200, thereby being electrically connected to each other.

As such, when the connector PCB 125a (not shown) is provided in close contact with the side surface 153 of the cover bottom 150, the bezel area of the liquid crystal display may be reduced, and the margin of the PCB 200 may be reduced. More space can be reserved and more LEDs 128 can be mounted.

As described above, the liquid crystal display of the present invention provides the connector pins 125a (not shown) at both ends of the PCB 200 in the longitudinal direction, and the connector pins 125a (not shown) have the length of the cover bottom 150. By connecting the connector PCB (125a, not shown) provided in the two edge side of the direction, so that one PCB 200 is connected to the LED driving circuit 160 through the connector PCB (125a, not shown), LED array The structure of the input / output wiring (221a, 221b of FIG. 6) for connecting the 128a of FIG. 7 can be prevented from being complicated, and the space for forming the input / output wiring (221a, 221b of FIG. 6) can be prevented. It's also easy.

Therefore, the present invention can mount a larger number of LEDs 128 without changing the size, thereby realizing a high brightness and high resolution liquid crystal display device.

In addition, by providing the connector PCB 125a (not shown) in close contact with the side surface 153 of the cover bottom 150, the bezel area of the liquid crystal display device may be reduced, and the free space of the PCB 200 may be reduced. It can be more secured so that a larger number of LEDs 128 can be mounted.

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.

125a, 125b: first and second connector PCB
127: LED assembly (128: LED, 200: PCB, 128a: LED array)
150: cover bottom, 210a, 210b: first and second connector pins

Claims (12)

A cover bottom consisting of a horizontal surface and a side surface;
First and second connector PCBs provided at two edges in the longitudinal direction of the cover bottom;
A plurality of LEDs and the plurality of LEDs are mounted, and a first and a second connection part are provided at both ends in a longitudinal direction, respectively, the first connection part is connected to the first connector PCB, and the second connection part is connected to the first connector part. An LED assembly comprising a PCB connected with a two connector PCB;
Liquid crystal panel located on the LED assembly
Liquid crystal display comprising a.
The method of claim 1,
The LED assembly is provided with a plurality in the longitudinal direction of the cover bottom, each of the PCB of each LED assembly is arranged in a direction perpendicular to the longitudinal direction of the cover bottom.
The method of claim 1,
And a plurality of LEDs mounted on each of the PCBs to receive signals from the outside through first and second connector PCBs, respectively.
The method of claim 3, wherein
The plurality of LEDs mounted on each PCB are divided into first and second partitions, and the plurality of LEDs located in the first partitions are connected through a plurality of input / output wires connected to the first connection part of the PCB. And a plurality of LEDs receiving a signal and receiving a signal through a plurality of input / output wires connected to the second connection part of the PCB.
The method of claim 4, wherein
The plurality of LEDs are mounted in units of n LED arrays, and an area in which the input / output wiring between each of the LED arrays is to be formed has a spacing of 4.7 mm to 8.3 mm.
The method of claim 2,
Each PCB is separated on the basis of the central portion in the longitudinal direction.
The method according to claim 6,
And third and fourth connector PCBs disposed at two edges along the longitudinal direction of the cover bottom so as to be adjacent to the first and second connector PCBs.
The method of claim 7, wherein
And the PCBs adjacent to each other in the longitudinal direction of the cover bottom are connected to the same one of the first to fourth connector PCBs.
The method of claim 1,
The first and second connection portions of the liquid crystal display device comprising a connector pin.
The method of claim 1,
The first and second connector PCBs are provided in close contact with the horizontal plane.
The method of claim 1,
The first and second connector PCBs are provided in close contact with the side surfaces, one end of each of the first and second connector PCBs is provided with connector pins for connector PCBs, and the first and second connection parts are formed of a connector. Display.
11. The method of claim 10,
The first and second connector PCB is positioned perpendicular to the PCB, the connector pin for the connector PCB is formed to face the horizontal plane, the connector pin insertion groove for the connector PCB of the connector is perpendicular to the PCB Liquid crystal display device formed toward the first and second connector PCB.

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