KR20130022241A - Liquid crystal display device and method of fabricating the same - Google Patents

Abstract

The present invention provides a liquid crystal display module comprising a liquid crystal panel and a backlight unit including a light emitting diode package including a plurality of light emitting diodes disposed behind the liquid crystal panel; Located at the rear of the liquid crystal display module, and includes a rear cover connected to the light emitting diode package through a plurality of connecting members, the connecting member provides a liquid crystal display device having a rod shape extending in the direction of the liquid crystal panel.

Description

Liquid crystal display device and method of fabricating the same

The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device and a manufacturing method thereof.

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 between two substrates facing each other with a liquid crystal layer interposed therebetween, and realizes a difference in transmittance by changing an arrangement direction of liquid crystal molecules by an electric field in the liquid crystal panel. .

However, since the liquid crystal panel does not have its own light emitting element, a separate light source is required to display the difference in transmittance as an image. Recently, light emitting diodes (LEDs) have been widely used as light sources for liquid crystal displays.

1 is an exploded perspective view of a conventional liquid crystal display device.

Referring to FIG. 1, an edge type liquid crystal display device having a light emitting diode, which is a light source, is disposed on a side of a conventional liquid crystal display device 100.

The edge type liquid crystal display device 100 includes a liquid crystal display module 110, a front cover 210 and a rear cover 220 for accommodating the liquid crystal display module 110.

The liquid crystal display module 110 may include a backlight unit including a liquid crystal panel 120, a reflective plate 131, a light guide plate 133, an optical sheet 135, and an LED package 137; 130 and a main supporter 140 accommodating the liquid crystal panel 120 and the backlight unit 130 having a rectangular frame shape and positioned at the front and rear of the liquid crystal display module 110. An in-top case 150 and a bottom case 160.

These components are modularized by the combination of the main supporter 140, the top case 150, and the bottom case 160 to form the liquid crystal display module 110.

In addition, the LED package 137 includes a plurality of light emitting diodes (LEDs) emitting light and a light emitting diode substrate (LSUB) mounted thereon. Such an LED package 137 is supported and protected by the bottom case 160.

Front and rear covers 210 and 220 for protecting and supporting the liquid crystal display module 110 are positioned at the front and the rear of the liquid crystal display module 110 as described above.

Although not shown, a main board controlling the operation of the liquid crystal display device 100 is located between the liquid crystal display module 110 and the rear cover 220.

As described above, the conventional edge type liquid crystal display device 100 requires a large number of parts, resulting in an increase in its thickness and manufacturing cost. This is a problem in manufacturing a low-cost entry-level liquid crystal display device that is a recent industry demand.

An object of the present invention is to provide a liquid crystal display device and a method for manufacturing the same, which can reduce the number of parts and reduce thickness and manufacturing cost.

In order to achieve the above object, the present invention provides a liquid crystal display device module including a liquid crystal panel and a backlight unit including a light emitting diode package including a plurality of light emitting diodes disposed behind the liquid crystal panel; Located at the rear of the liquid crystal display module, and includes a rear cover connected to the light emitting diode package through a plurality of connecting members, the connecting member provides a liquid crystal display device having a rod shape extending in the direction of the liquid crystal panel.

The light emitting diode package may include a light emitting diode substrate on which the light emitting diode is mounted, and a through hole through which the connection member penetrates may be formed in the light emitting diode substrate.

It may include a fastening member fastened to the end of the connection member in the direction toward the liquid crystal panel.

The connection member may be provided with a locking step for mounting the light emitting diode substrate.

The driving board may be disposed between the light emitting diode package and the rear cover and connected to the rear cover through the connection member.

In another aspect, the present invention comprises the steps of connecting the rear cover and the light emitting diode package of the backlight unit included in the liquid crystal display device module through a plurality of connecting members; And disposing a liquid crystal panel in front of the backlight unit, wherein the connection member has a rod shape extending in the direction of the liquid crystal panel.

The light emitting diode package may include a light emitting diode substrate on which the light emitting diode is mounted, and a through hole through which the connection member penetrates may be formed in the light emitting diode substrate.

And fastening a fastening member to an end of the connection member facing toward the liquid crystal panel.

The connection member may be provided with a locking step for mounting the light emitting diode substrate.

And connecting the rear cover and the driving board between the light emitting diode package and the rear cover through the connection member.

In the present invention, the direct type backlight unit is used and the LED package of the backlight unit is connected to the rear cover. Accordingly, components such as a diffusion sheet and a bottom case which are conventionally used may be deleted. Therefore, the manufacturing cost of the liquid crystal display device can be reduced, and the thickness thereof can be reduced.

1 is an exploded perspective view showing a conventional liquid crystal display device.
2 is an exploded perspective view schematically showing a liquid crystal display device according to an exemplary embodiment of the present invention.
Figure 3 is a cross-sectional view showing a structure in which the LED package is connected to the rear cover according to an embodiment of the present invention.
4 is a cross-sectional view showing an example of a structure for firmly fixing the LED package according to an embodiment of the present invention.

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

2 is an exploded perspective view schematically showing a liquid crystal display device according to an embodiment of the present invention, Figure 3 is a cross-sectional view showing a structure in which the LED package is connected to the rear cover according to an embodiment of the present invention.

As illustrated, the liquid crystal display device 300 according to the exemplary embodiment of the present invention may include a liquid crystal display module 310, a front cover 410, and a rear cover 420 for accommodating the liquid crystal display module 310.

Here, the liquid crystal display device module 310 may include a liquid crystal panel 320, a backlight unit 330, a main supporter 340, and a top case 350.

The liquid crystal panel 320 plays a key role in image representation. The liquid crystal panel 320 includes first and second substrates 322 and 324 bonded to each other with the liquid crystal layer interposed therebetween.

At this time, under the premise of an active matrix method, although not shown in the drawings, a plurality of gate wirings and data wirings are intersected and arranged in a matrix form on the first substrate 322, which is commonly called an array substrate. A pixel is defined, and a thin film transistor (TFT) is provided at each intersection to be connected to a transparent pixel electrode formed in each pixel.

On the other hand, the second substrate 324, which is the opposite substrate facing the first substrate 322, has a color filter of red, green, and blue, for example, corresponding to each pixel. A black matrix covering each color filter and covering non-display elements such as a gate wiring, a data wiring, and a thin film transistor may be provided. When the color filter is provided in this way, the second substrate 324 is called a color filter substrate. Meanwhile, the second substrate 324 may further include a transparent common electrode covering the color filter and the black matrix.

The liquid crystal molecules are aligned in the liquid crystal layer according to the electric field generated by the pixel electrode and the common electrode as described above, thereby displaying an image.

Although not shown, polarizers may be attached on the outer surfaces of the first and second substrates 322 and 324 to selectively transmit only light having a specific polarization.

Meanwhile, in the above description, the case where the pixel electrode and the common electrode are formed on the first and second substrates 322 and 324 are described as an example, but the liquid crystal panel 320 having a different structure may be used. Can be. For example, a transverse field type liquid crystal panel in which both the pixel electrode and the common electrode are configured on the first substrate 322, which is an array substrate, and drives the liquid crystal through the transverse electric field may be used.

The backlight unit 330 is configured to supply light to the liquid crystal panel 320, and the backlight unit 330 according to the exemplary embodiment of the present invention may be disposed in substantially the entire rear of the liquid crystal panel 320. ) And an optical sheet 335 positioned thereon.

The LED package 337 may include an LED substrate LSUB and a plurality of light emitting diodes LEDs disposed throughout the upper surface thereof. As described above, unlike the related art, in the exemplary embodiment of the present invention, the light emitting diodes (LEDs) are disposed to face the liquid crystal panel 320, and the liquid crystal display device 300 in which the light emitting diodes (LEDs) are disposed is a direct type ( direct type) is called a liquid crystal display device.

As described above, in the exemplary embodiment of the present invention, the light emitting diodes (LEDs) are formed on the entire rear surface of the liquid crystal panel 320, and the light emitting diodes are superior in terms of luminance and parts reduction compared with the conventional light emitting diodes disposed on one side. Effective in

In this regard, in the conventional edge type, as the light emitting diodes are disposed on the side, a light guide plate should be used to provide light of a uniform surface light source to the liquid crystal panel. In addition, the optical sheet positioned on the light guide plate is configured to include a diffusion sheet.

On the contrary, in the direct type according to the embodiment of the present invention, the light emitting diodes (LEDs) are directly disposed under the liquid crystal panel 320 to supply light, thereby using light guide plates and diffusion sheets required in the conventional edge type. There is no need.

As a result, it is possible to reduce components such as a conventional light guide plate and a diffusion sheet, and it is possible to improve a phenomenon in which the brightness of light is lowered by passing them, and as a result, it is possible to achieve component reduction and luminance improvement.

As the light emitting diode substrate LSUB of the LED package 337, a metal PCB having excellent heat dissipation function using a metal material as a base, for example, a metal core printed circuit board (MCPCB), may be used. In the MCPCB, an insulating layer is formed on a base layer made of a metal material, and a wiring pattern is formed on the insulating layer. As such, the base layer is made of a metal material, thereby effectively dissipating heat generated from the light emitting diodes (LEDs).

The plurality of light emitting diodes (LEDs) disposed on the light emitting diode substrate LSUB may be formed of white light emitting diodes emitting white light, or may be red, green, and blue. ) May be formed of light emitting diodes, but is not limited thereto.

Meanwhile, the optical sheet 335 disposed on the LED package 337 may include at least one prism sheet, and referring to the above description, the optical sheet 335 may not need to include a diffusion sheet.

The backlight unit 330 may include a reflector 331 reflecting light emitted from the light emitting diodes (LEDs) in the direction of the liquid crystal panel 320. The reflective plate 331 may include an opening hole corresponding to each of the light emitting diodes (LEDs). Accordingly, the reflector plate 331 may be placed on the upper surface of the LED substrate LSUB through the light emitting diode LED.

On the other hand, the LED package 337 according to an embodiment of the present invention can be connected and supported and protected to the rear cover 420 located at the rear thereof, which will be described in detail below.

The top case 350 may have a rectangular frame having a cross section bent in a “a” shape, for example, to cover the top and side edges of the liquid crystal panel 320. The top case 350 opens the front surface of the top case 450 to form a liquid crystal. The image implemented in the panel 320 is configured to be displayed to the outside.

The main supporter 340 surrounds the edges of the liquid crystal panel 320 and the backlight unit 330, and may be assembled to the top case 350. The main supporter 340 may accommodate and protect the liquid crystal panel 320 and the optical sheet 335 of the backlight unit 330.

On the other hand, in the embodiment of the present invention, unlike the conventional liquid crystal display device, the bottom case is not used.

In this regard, in the conventional edge type liquid crystal display device, the bottom case is positioned under the LED package to support and protect the LED package.

However, according to the exemplary embodiment of the present invention, it can be seen that the LED package 337 is connected to the rear cover 420 located at the rear thereof to be protected and supported.

As such, in the liquid crystal display device 300 according to the exemplary embodiment of the present invention, the bottom case for protecting and supporting the conventional LED package is not required.

Accordingly, in the liquid crystal display device 300 according to the exemplary embodiment of the present invention, components such as a bottom case can be reduced, and as a result, manufacturing cost can be reduced.

The front cover 410 is positioned in front of the top case 350 to have a rectangular frame shape surrounding the edge of the display screen of the liquid crystal display module 310. The front surface of the front cover 410 is configured to be open to display an image implemented in the liquid crystal display module 310.

The rear cover 420 may be disposed at the rear of the backlight unit 330 and may have a rectangular shape substantially covering the entire rear of the liquid crystal display module 300. The rear cover 420 may be connected to a pedestal (not shown). In this case, the liquid crystal display 300 used as a TV or a monitor in a home or office may be stably placed on a shelf or a desk through the pedestal. It becomes possible. Such a pedestal may be manufactured in one body with the same material as the rear cover 420.

As described above, the liquid crystal display module 310 may be finally combined with the front cover and the rear cover 410 and 420 to complete the manufacture of the liquid crystal display device 300 according to an exemplary embodiment of the present invention.

The front cover and the rear cover 410 and 420 are components located at the rearmost front of the liquid crystal display device 300, and can protect and support the components located therein.

In particular, the rear cover 420 is located behind the backlight unit 330 and connected thereto to support and protect the backlight unit 330. Accordingly, as described above, the bottom case which is a configuration supporting the conventional LED package can be deleted. As a result, the manufacturing cost of the liquid crystal display device 300 according to the exemplary embodiment of the present invention can be reduced.

On the other hand, in the embodiment of the present invention, for driving used to drive the liquid crystal display device 300, the rear of the liquid crystal display module 310, that is, between the liquid crystal display module 310 and the rear cover 420 The board 430 may be further provided.

For example, the driving board 430 may be a power board on which circuit components related to the driving power supply of the liquid crystal display device 300 are mounted. In this case, the light emitting diode substrate LSUB is electrically connected to the driving board 430 through a cable or the like, so that power for driving the light emitting diode substrate LSUB may be supplied.

Meanwhile, a circuit component for providing a control signal for controlling the driving of the liquid crystal display device 300 may be further mounted on the driving board 430. In this case, the driving board 430 may have a function of a system board or a main board in addition to the function of a power board.

Of course, the above use of the driving board 430 may be used for various purposes as an example.

Such a driving board 430 may be connected to the rear cover 420 together with the LED package 337 to be supported and protected. In such a case, the driving board 430 will be able to reduce the parts, as compared to the case where the components for fixing and supporting the same as the conventional bottom case is separately provided, as a result the manufacturing cost can be reduced Will be.

On the other hand, in the embodiment of the present invention, the driving board 430 and the LED package 337 is described as an example of the configuration that is connected to the rear cover 420 is fixed and supported through the same connection member 440 as an example. Other configurations may be employed.

For example, the driving board 430 and the rear cover 420 are connected through a connecting member (ie, the first connecting member), and the driving board 430 and the LED package 337 are connected to the first connecting member. A configuration connected through another separate connecting member (ie, the second connecting member) may be employed. Of course, even in such a case, as a result, the LED package 337 will be said to be connected to the rear cover 420 via the driving board 430.

As another example, the LED package 337 and the rear cover 420 are connected through the connection member 440, and the driving board 430 may not be connected between these connection structures. That is, this case will correspond to a case in which the driving board 430 and the LED package 337 have a relationship in which they are not structurally connected.

Hereinafter, referring to FIG. 3, the LED package is connected to the rear cover in more detail according to an embodiment of the present invention.

2 and 3, the driving board 430 and the rear cover 420 are sequentially positioned behind the LED package 337. Here, the LED package 337 and the driving board 430 may be spaced apart from each other by a predetermined interval, and the driving board 430 and the rear cover 420 may be spaced apart from each other by a predetermined interval. Of course, in some cases, the driving board 430 and the rear cover 420 may be in close contact with each other, and the opposite surfaces may be substantially in contact with each other, and the LED package 337 and the driving board 430 may be in close contact with each other. The faces being contacted may be substantially in contact.

The LED package 337 and the driving board 430 as described above are rear cover 420 through a connecting member 440 protruding from the rear cover 420 toward the LED package 337, that is, the liquid crystal panel 320. Can be fixed, supported and protected.

The connection member 440 may be integrally formed of the same material as the rear cover 420 (for example, a plastic material). Of course, the connection member 440 may be a separate component made of a different material from the rear cover 420, in this case the connection member 440 and the rear cover 420 may be fastened through a separate fastening member. have.

The connection member 440 may have, for example, a rod shape extending substantially straight toward the direction of the LED package 337. In addition, the cross section of the connection member 430 may have a circular or polygonal shape, for example.

Such connection members 440 may be provided in plural. For example, in consideration of the rectangular shape of the LED package and the driving boards 337 and 430, four connection members 440 corresponding to the corners of the rectangular shape may be provided. It may be provided. Of course, the number and position of the connection member 440 may be changed in consideration of various aspects such as fastening stability.

In response to the connection member 440, first and second through holes 451 and 452 may be formed in the light emitting diode substrate LSUB and the driving board 430 of the LED package 337, respectively. The connection member 440 penetrates the LED package 337 and the driving board 430 through the through holes 451 and 452, such that the LED package 337 and the driving board 430 are rear cover 420. ) Can be combined. Here, the width of each of the first and second through holes 451 and 452 may be substantially the same as the width of the connection member 430, but is not limited thereto.

In connection with such a coupling, first, the connecting member 440 is inserted into the second through hole 452 so that the driving board 430 can be coupled to the rear cover 420. At this time, the driving board 430 is inserted as much as the set position, the separation interval with the rear cover 420 can be adjusted to the desired degree.

After the driving board 430 is coupled to the rear cover 420 as described above, the connection member 440 may be inserted into the first through hole 451 to couple the LED package 337 to the rear cover 420. Will be. At this time, the LED package 337 is inserted as much as the set position, the separation interval with the rear cover 420 can be adjusted to the desired degree.

After the connecting member 440 penetrates the driving board 430 and the LED package 337 as described above, one end of the connecting member 440 (that is, the end positioned in the direction of the liquid crystal panel 320) is a nut. The fastening member 450 may be fastened.

By using the fastening member 450 as described above, the LED package and the driving board 337, 430 can be prevented from being separated from the connection member 440 by flowing in the longitudinal direction of the connection member 440. On the other hand, when the nut is used as the fastening member 450, one end portion of the corresponding connection member 440 may be configured to function as a bolt.

On the other hand, in order to more securely fix the LED package 337, the connecting member 440 corresponding to the rear surface of the LED package 337 (that is, the facing surface of the rear cover 420), for example, the locking step is to be configured Can be. In this regard, referring further to FIG. 4, a locking step 441 having a wider width than that of the front part may be provided by forming a step at one end of the connection member 440. The latching jaw 441 is configured to have a larger width than the first through hole 451, so that the light emitting diode substrate LSUB of the LED package 337 is seated on the locking jaw 441. Then, the above-described fastening member 450 is fastened in front of the LED package 337. Accordingly, the LED package 337 is prevented by the fixing means such as the locking jaw 441 and the fastening member 450 located at the rear and front thereof can be more firmly fixed.

The fixing structure using the locking jaw 441 and the fastening member 450 as described above may also be applied to the driving board 430 to allow a more firm fixing thereto. That is, by configuring the locking step corresponding to the set position of the driving board 430 and the fastening member in front of the driving board 430, it is possible to achieve a more rigid fixing of the driving board.

The optical sheet 335 and the liquid crystal panel 320 may be disposed on the LED package 337 connected to the rear cover 420 as described above, and finally, the liquid crystal display device 300 is combined by combining the aforementioned components. It becomes possible to manufacture.

As described above, according to the embodiment of the present invention, the direct type backlight unit is used and the LED package of the backlight unit is connected to the rear cover. Accordingly, components such as a diffusion sheet and a bottom case which are conventionally used may be deleted. Therefore, the manufacturing cost of the liquid crystal display device can be reduced, and the thickness thereof can be reduced.

Embodiment of the present invention described above is an example of the present invention, it is possible to change freely within the scope included in the spirit of the present invention. Accordingly, the invention includes modifications of the invention within the scope of the appended claims and their equivalents.

300: liquid crystal display device 310: liquid crystal display module
320: liquid crystal panel 322: first substrate
324: second substrate 330: backlight unit
331: reflector 335: optical sheet
337: LED package 340: main supporter
350: top case 410: front cover
420: rear cover 430: driving board
440: connecting member 451: first through hole
452: second through hole
LED: Light Emitting Diode LSUB: Light Emitting Diode Board

Claims (10)

A liquid crystal display module including a liquid crystal panel and a backlight unit including a light emitting diode package including a plurality of light emitting diodes disposed behind the liquid crystal panel;
Located at the rear of the liquid crystal display module, and includes a rear cover connected to the light emitting diode package through a plurality of connecting members,
The connecting member has a rod shape extending in the liquid crystal panel direction.
LCD display device.
The method of claim 1,
The light emitting diode package includes a light emitting diode substrate on which the light emitting diode is mounted.
The light emitting diode substrate has a through hole through which the connection member is formed.
LCD display device.
The method of claim 2,
And a fastening member fastened to an end of the connection member facing toward the liquid crystal panel.
The method of claim 3, wherein
And a locking step in which the light emitting diode substrate is seated on the connection member.
The method of claim 1,
And a driving board positioned between the light emitting diode package and the rear cover and connected to the rear cover through the connection member.
Connecting the rear cover positioned at the rear of the liquid crystal display device module and the light emitting diode package of the backlight unit included in the liquid crystal display device module through a plurality of connection members;
Disposing a liquid crystal panel in front of the backlight unit;
The connecting member has a rod shape extending in the liquid crystal panel direction.
A method of manufacturing a liquid crystal display device.
The method according to claim 6,
The light emitting diode package includes a light emitting diode substrate on which the light emitting diode is mounted.
The light emitting diode substrate has a through hole through which the connection member is formed.
A method of manufacturing a liquid crystal display device.
The method of claim 7, wherein
And fastening a fastening member to an end of the connection member facing toward the liquid crystal panel.
The method of claim 8,
And a locking step of the connection member on which the light emitting diode substrate is seated.
The method according to claim 6,
And connecting the rear cover and the driving board between the light emitting diode package and the rear cover through the connection member.

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