KR101790061B1 - Liquid crystal display device - Google Patents

Abstract

The present invention relates to a liquid crystal display device.
According to the present invention, since the insertion groove in which the system board is seated is formed in the cover bottom, the conventional back cover can be raised.
In this way, components of the liquid crystal display device can be reduced to reduce component cost and assembly time, and a lightweight and thin liquid crystal display device can be realized.

Description

[0001] LIQUID CRYSTAL DISPLAY DEVICE [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly to a lightweight and thin liquid crystal display device.

A liquid crystal display device (LCD), which is advantageous for moving picture display and has a large contrast ratio and is actively used in TVs and monitors, exhibits optical anisotropy and polarization properties of a liquid crystal, And the like.

Such a liquid crystal display device has a liquid crystal panel in which a liquid crystal panel is interposed between two adjacent substrates through a liquid crystal layer as an essential component and changes the alignment direction of the liquid crystal molecules in an electric field in the liquid crystal panel to realize a difference in transmittance do.

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. To this end, a backlight unit having a light source is disposed on the back of the liquid crystal panel.

Such a backlight unit includes a light source and is divided into a direct type and an edge type according to the position of a light source.

A direct-type backlight unit is a method in which light emitted from a light source is directly supplied to a liquid crystal panel by disposing a light source under the liquid crystal panel. In a side-type backlight unit, a light guide plate is disposed under the liquid crystal panel, So that the light emitted from the light source is indirectly supplied to the liquid crystal panel by using refraction and reflection in the light guide plate.

At this time, the side-type backlight unit is easier to manufacture than a direct-type backlight unit, and is widely used because of its thin shape, light weight, and low power consumption.

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

1, the liquid crystal display device 1 includes a liquid crystal display module 1a for implementing an image, a front cover 70 for accommodating the liquid crystal display module 1a and a back cover 80, .

Here, the liquid crystal display module 1a includes a backlight unit 20 including a liquid crystal panel 10, a reflection plate, a light guide plate, a plurality of optical sheets, and a light source 29, The top cover 40 and the cover bottom 50 which are placed on the front edge of the liquid crystal panel 10 are coupled to each other at the front and rear sides.

The system board 60 is provided on the rear surface of the liquid crystal display module 1a, that is, on the rear surface of the cover bottom 50.

The liquid crystal display module 1a is mounted on the front case 70 covering the front edge of the liquid crystal display module 1a after the system board 60 is mounted on the back surface of the cover bottom 50, And a back cover 80 covering the system board 60 positioned on the back are respectively coupled to the front and rear sides to be integrated into the liquid crystal display 1.

On the other hand, recently, liquid crystal display devices have been widely used in portable computers, desktop computer monitors, wall-mounted televisions, and the like, and have a wide display area while minimizing weight and having a slim design and a beautiful appearance Research is actively underway.

However, in spite of this research, there are too many constituent elements of the liquid crystal display device, which hinders the thinness and light weight of the liquid crystal display device, and complicates assembly and disassembly processes of the liquid crystal display device.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and to provide a liquid crystal display device which is reduced in assembly time by modifying components of a liquid crystal display device, .

Further, it is an object of the present invention to provide a liquid crystal display device having a slim and beautiful appearance.

According to an aspect of the present invention, there is provided a liquid crystal display device comprising: a liquid crystal display module in which a liquid crystal panel and a backlight unit are modularized through a support main, a top cover and a cover bottom; A system board located inside the cover bottom; And a cover for covering the top edge of the liquid crystal display module, wherein the cover bottom has an insertion groove protruding from the front surface at a predetermined depth in the back surface direction and on which the system board is seated.

The system board includes a controller, an inverter, an OSD (On Screen Display) board, a speaker, an adapter, and various cables for controlling a display, an audio output, or a liquid crystal display.

And the system board is seated in the insertion groove in a direction in which the component mounting surface mounted with the plurality of components faces the liquid crystal panel.

And the system board is seated in the insertion groove such that a component mounting scene in which the plurality of components are mounted faces the backside of the cover bottom.

The system board is provided with screw through holes corresponding to the screw embosses, and the system board is inserted through the screw through holes and the screw embossed through the screw embossing, As shown in Fig.

In addition, the insertion groove is formed with a sliding guide slot through which the system board slides to the inside of both edges connected to the one edge.

And the sliding guide slot comprises a slide member and a sliding guide rail.

The protective cover may further include a protective film disposed on the top of the front cover.

The backlight unit includes a reflective plate placed on the cover bottom, a light guide plate disposed on the reflective plate, a plurality of optical sheets positioned above the light guide plate, and a light source positioned on at least one side of the light guide plate And is located on the back surface of the liquid crystal panel.

Alternatively, the backlight unit may include a reflective plate that is seated on the cover bottom, a light source that is disposed on the reflective plate, a diffusion plate that is positioned above the light source, and a plurality of optical sheets that are positioned on the diffusion plate And is located on the back surface of the liquid crystal panel.

According to the liquid crystal display device of the present invention, since the back cover is formed integrally with the cover bottom, the assembly time due to assembly and fastening can be shortened, and since the back cover can be manufactured in a simple and various design without any seams, The display device can be implemented.

Particularly, by eliminating the conventional back cover, components of the liquid crystal display device can be reduced, and a lightweight and thin liquid crystal display device can be realized.

1 is an exploded perspective view of a conventional liquid crystal display device.
2 is an exploded perspective view of a liquid crystal display according to a first embodiment of the present invention;
3 is a cross-sectional view of a liquid crystal display according to a first preferred embodiment of the present invention.
4 is a perspective view showing a front surface of a cover bottom according to a first preferred embodiment of the present invention.
FIG. 5 is a perspective view showing a rear surface of a cover bottom according to a first preferred embodiment of the present invention. FIG.
FIG. 6 is a view showing a cover bottom according to a second preferred embodiment of the present invention and a system board mounted on the cover bottom in a sliding manner. FIG.
7 is a sectional view of a liquid crystal display according to a third embodiment of the present invention.

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

FIG. 2 is an exploded perspective view of a liquid crystal display device according to a preferred embodiment of the present invention, and FIG. 3 is a cross-sectional view of a liquid crystal display device according to a preferred embodiment of the present invention.

2 and 3, the liquid crystal display device 100 includes a front cover 170 for protecting the liquid crystal display module 100a and the liquid crystal display module 100a, . Here, as shown in FIG. 2, the protective film 190 attached to the front surface of the liquid crystal display device 100 may further be provided.

The liquid crystal display module 100a includes a support main body 130 and a cover bottom 150 for modularizing the liquid crystal panel 110, the backlight unit 120, the liquid crystal panel 110 and the backlight unit 120, And a top cover 140.

The liquid crystal panel 110 is a part that plays a key role in image display and is composed of a first substrate 112 and a second substrate 114 which are bonded to each other with a liquid crystal layer interposed therebetween.

Although not shown in the drawing, a plurality of gate lines and data lines cross each other on the inner surface of a first substrate 112, which is usually referred to as a lower substrate or an array substrate, on the premise of an active matrix system, pixels are defined, And a thin film transistor (TFT) is provided and connected in a one-to-one correspondence with the transparent pixel electrode formed in each pixel.

On the inner surface of the second substrate 114 called an upper substrate or a color substrate, a color filter of red (R), green (G), and blue (B) And a black matrix for covering non-display elements such as a gate line, a data line, and a thin film transistor.

The first and second polarizers 119a and 119b selectively transmit only specific light to the outer surfaces of the first and second substrates 112 and 114, respectively.

A printed circuit board (not shown) is connected to at least one edge of the liquid crystal panel 110 through a connection member (not shown) such as a flexible circuit board or a tape carrier package (TCP) It can be properly brought into close contact with the side surface of the support main body 130 or the backside of the cover bottom 150 in the modularization process.

When the thin film transistor selected for each gate line is turned on by the on or off signal of the gate driving circuit transmitted through the printed circuit board (not shown), the liquid crystal panel 110 having the above- The signal voltage of the liquid crystal molecules is transmitted to the corresponding pixel electrode through the data line and the alignment direction of the liquid crystal molecules is changed by the electric field between the pixel electrode and the common electrode.

On the rear surface of the liquid crystal panel 110, a backlight unit 120 is provided to supply light so that the difference in transmittance can be displayed as an image.

The backlight unit 120 includes a light source arranged along at least one edge of the support main body 130, a reflection plate 125, a light guide plate 123 mounted on the reflection plate 125, Sheets 121 as shown in FIG.

LEDs 129a may be used as a light source as shown in the figure. A plurality of LEDs 129a may be spaced apart from each other by a predetermined distance to be mounted on a printed circuit board (PCB) 129b, 129).

Although not shown in the figure, the LED lamp housing may further include a LED lamp housing that protects the LED assembly 129 and concentrates light emitted from each of the plurality of LEDs 129a toward the light guide plate 123.

The LED lamp housing may have a bar shape corresponding to the size of the printed circuit board 129b or may be formed in a shape of a letter 'C' that can cover both sides of the printed circuit board 129b and the LEDs 129a. Or may be provided in a 'C' shape to cover one side of the printed circuit board 129b and the plurality of LEDs 129a.

Instead of the LED assembly 129, a fluorescent lamp such as a cold cathode fluorescent lamp (CCFL) or an external electrode fluorescent lamp may be used. If a fluorescent lamp is used, the outside of the fluorescent lamp may be protected And guide the light toward the light guide plate 123. The light guiding plate 123 may include a lamp guide.

The LED assembly 129 is fixed in position by adhesion or the like so that the light emitted from the plurality of LEDs 129a faces the light incidence surface of the light guide plate 123. [

The light emitted from the plurality of LEDs 129a of the LED assembly 129 is indirectly supplied to the liquid crystal panel 110 by using refraction and reflection at the light guide plate 123. [

An LED driver integrated circuit (IC) (not shown) for driving each block of the LED assembly 129 is mounted.

The light guiding plate 123 uniformly spreads the light incident from each of the plurality of LEDs 129a to the wide area of the light guiding plate 123 while advancing in the light guiding plate 123 by total reflection to provide a surface light source to the liquid crystal panel 110 .

The light guide plate 123 may include a pattern of a specific pattern on the back surface to supply a uniform surface light source. The pattern may be formed in various shapes such as an elliptical pattern, a polygon pattern, a hologram pattern, and the like in order to guide light incident into the light guide plate 123, And may be formed on the lower surface of the base plate 123 by a printing method or an injection method.

The reflection plate 125 positioned on the back surface of the light guide plate reflects light passing through the back surface of the light guide plate 123 toward the liquid crystal panel 110, thereby improving the brightness of light.

The plurality of optical sheets 121 mounted on the light guide plate 123 include a diffusion sheet, at least one prism sheet, a protective sheet, and the like. The light guide plate 123 diffuses or condenses light, So that a more uniform planar light source is incident.

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. When the system board 160 is inserted into the cover bottom 150 .

The system board 160 mounted on the cover bottom 150 receives a video or audio signal input from the outside and transmits the video or audio signal to the liquid crystal panel 110 or a speaker and controls a display or an audio output. An on-screen display (OSD) board for controlling functions related to the screen adjustment, a speaker for outputting a sound signal, and a liquid crystal display (LCD) An adapter for supplying power, and various cables can be mounted.

The cover bottom 150 has a rectangular plate shape, and at least one edge of the cover bottom 150 has a side formed by vertically bending a predetermined height.

3, the cover bottom 150 is formed with an insertion groove 210 protruding from the front side in the back direction so that the system board 160 is seated in the insertion groove 210.

At this time, as shown in the figure, the system board 160 is seated in the insertion groove 210 so that a component mounting scene in which a plurality of components are mounted faces the front surface of the cover bottom 150.

The system board 160 may be seated in the insertion groove 210 so as to face the liquid crystal panel 110 with a component mounting scene in which a plurality of components are mounted.

The system board 160 is seated in the insertion groove 210 protruding in the back direction of the cover bottom 150 and the backlight unit 120 is seated on the system board 16.

The system board 160 is assembled in a process in which the liquid crystal panel 110 and the backlight unit 120 are coupled with the cover main body 140 and the cover bottom 150 through the support main body 130, It is modularized together.

More specifically, the support main body 130 having a rectangular rim crosses the edges of the liquid crystal panel 110 and the backlight unit 120, the top cover 140 covers the top edge of the liquid crystal panel 110, The cover bottom 150 on which the system board 160 is mounted in the insertion groove 210 protruding in the back direction covers the back surface of the backlight unit 120 and is modularized.

The light emitted from each of the plurality of LEDs 129a of the backlight unit 120 is incident on the light incident portion of the light guide plate 123 and is refracted toward the liquid crystal panel 110 from inside thereof, While being passed through the plurality of optical sheets 121 together with the light reflected by the liquid crystal panel 125, the liquid crystal panel 110 is processed into a more uniform high-quality surface light source.

The liquid crystal display module 100a is finally assembled through the front cover 170. The front cover 170 is bent in a form of a section so as to cover the front and side edges of the liquid crystal display module 100a And is configured such that an image displayed on the liquid crystal display module 100a can be displayed with the front surface opened.

Accordingly, the liquid crystal display module 100a is assembled by integrating the front cover 170, which covers the front and side edges of the liquid crystal display module 100a, from the front.

At least one edge between the front cover 170 and the liquid crystal display module 100a or more precisely between the front cover 170 and the first polarizer 119a attached to the liquid crystal panel 110 is provided with a first pad The first pad 185a may include a first polarizer 119a attached to the liquid crystal panel 110 when the liquid crystal display module 100a and the front cover 170 are coupled to each other, To protect the liquid crystal panel 110 and to prevent the liquid crystal panel 110 from flowing.

The second main polarizer 119b attached to the support main 130 and the liquid crystal panel 110, more precisely the support main 130 and the liquid crystal panel 110, The second pad 185b may be disposed on at least one edge between the liquid crystal panel 110 and the backlight unit 120. The second pad 185b may be attached to the liquid crystal panel 110 in the process of modifying the liquid crystal panel 110 and the backlight unit 120 To protect the first polarizing plate 119a and further the liquid crystal panel 110 and to prevent the liquid crystal panel 110 from flowing.

A protective film may be attached to the front surface and the outermost surface of the liquid crystal display device 100. The protective film 190 protects the front surface of the liquid crystal display device 100, To prevent glare and to improve the visibility.

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

As described above, the cover bottom 150 according to the present invention is provided with an insertion groove protruding in the back direction. The cover bottom will be described in more detail with reference to the drawings.

FIG. 4 is a perspective view showing a front face of a cover bottom according to a first preferred embodiment of the present invention, FIG. 5 is a perspective view showing the back face of the cover bottom according to a first preferred embodiment of the present invention, and FIG. 2 and FIG. 3 .

As shown in FIG. 4, the cover bottom 150 includes an insertion groove 210 protruding backward in a size corresponding to the system board 160.

These insertion grooves 210 have a first depth A such that the first depth A of the insertion groove 210 is formed deeper than the overall thickness of the system board 160 on which the various components are mounted, (160) is not projected to the outside of the insertion groove (210) of the cover bottom (150).

Although not shown in the drawing, the system board 160 may be fixed to the insertion groove of the cover bottom 150 through a fastening member such as a screw (not shown). For this purpose, a screw is passed through the system board 160 And a screw embossment corresponding to the screw penetration hole may be formed at a position corresponding to the screw penetration hole on the entire surface of the insertion groove 210. [

The fastening member is inserted into the screw through hole formed in the system board 160 and the screw emboss formed in the insertion groove 210 so that the system board 160 is seated in the insertion groove 210 of the cover bottom 150 And the backlight unit 120 is seated on the system board 160.

As shown in FIG. 5, a back surface or at least one side surface of the insertion groove 210 formed in the cover bottom 150 may be connected to the system board 160 and may receive a driving signal, The connection terminals 220 may be provided.

The at least one connection terminal 220 may output video and audio signals from the liquid crystal display device 100 to the outside.

The cover bottom 150 may be made of metal or plastic. When the cover bottom 150 is formed of metal, it is subjected to a deep drawing process in which a desired shape is formed by applying pressure with a punch during press processing And is implemented by injection molding when implemented in plastic.

As described above, according to the present invention, since the system board is positioned inside the cover bottom by forming the insertion groove into which the system board can be inserted in the cover bottom, the conventional back cover is eliminated, And a slim thin liquid crystal display device can be realized.

In addition, as the number of components is reduced, time and cost for assembling and fastening can be reduced, and no seam due to assembly can be generated, thereby eliminating the risk of foreign matter being introduced from the outside, and realizing a simpler and more beautiful design .

FIG. 6 is a view showing a cover bottom according to a second preferred embodiment of the present invention and a system board mounted on the cover bottom in a sliding manner.

As shown in Fig. 6, the system board 160 may be slidably mounted through one side of the insertion groove (210 in Fig. 4).

4) formed in the cover bottom 150 has a sliding guide slot (not shown in the drawing) inside the two edges 260 opened at one edge 250 and connected to the opened edge 250, Can be formed.

The sliding guide slot (not shown) comprises a sliding guide rail (not shown) for facilitating sliding of a sliding member (not shown) and a sliding guide slot (not shown) And guiding the sliding. The sliding member may further include a stopper (not shown) for preventing the system board 160 from being separated from the system board 160. The stopper may be provided at an end of a sliding guide rail (not shown) ) Is fixed.

Accordingly, the system board 160 is inserted into the insertion groove (210 in FIG. 4) through one opened edge 250 of the insertion groove (210 in FIG. 4) protruding in the back direction of the cover bottom 150 And a sliding guide slot (not shown) provided inside each of the edges 260 perpendicularly connected to the opened edge 250.

At this time, the system board 160 may be slidably mounted into the insertion groove 210 (FIG. 4) so that the component mounting surface where a plurality of components are mounted faces the front surface of the cover bottom 150 as shown in the drawing (FIG. 4) 210, so that a component mounting scene in which a plurality of components are mounted faces the liquid crystal panel 150.

When the system board 160 is slidably mounted using the sliding guide slot (not shown), the system board 160 can be easily attached and detached, so that operations such as replacing parts or repairing can be performed more easily do.

In the above description, the liquid crystal display device of the lateral type in which the light source is disposed on the side is described. However, the present invention is also applicable to the direct liquid crystal display device in which the light source is disposed under the liquid crystal panel.

7 is a cross-sectional view of a liquid crystal display according to a third embodiment of the present invention. 2 and 3 are denoted by the same reference numerals, and a description thereof will be omitted.

As shown in FIG. 7, the liquid crystal display device 200 includes a front cover 170 that protects the liquid crystal display device module and the liquid crystal display device module, and finalizes the device.

The liquid crystal display module includes a support main body 130 for modulating a liquid crystal panel 110, a backlight unit 120, a liquid crystal panel 110 and a backlight unit 120, a cover bottom 150, a top cover 140 ).

The backlight unit 120 includes a reflection plate 121 mounted on the cover bottom 150 in a direct lowering manner, a light source arranged in parallel on an upper portion of the reflection plate 121, a diffusion plate 222 ), And a plurality of optical sheets 121 interposed therebetween.

In this case, a plurality of fluorescent lamps 200 are used as a light source. In the fluorescent lamps 200, external electrodes 200a for injecting fluorescent material and mercury are formed outside the ends of the tubes 200b The external electrode 200a and the balance PCB 202 are connected to each other.

The balance PCB 202 includes a balancing unit (not shown) for distributing a current in parallel to the plurality of fluorescent lamps 200 and is mounted on the outer side of the reflector 121 on the side of the cover bottom 150, The fluorescent lamps 200 may be arranged perpendicularly to the longitudinal direction of the plurality of fluorescent lamps 200 in order to connect the fluorescent lamps 200 in parallel. The balance unit may be a capacitor in consideration of the occupied area and cost.

On both sides of the plurality of fluorescent lamps 200 and the cover bottom 150, the support side 204 covers both ends of the plurality of fluorescent lamps 200.

The support side 204 supports the diffusion plate 222 and is disposed between the plurality of fluorescent lamps 200 and the diffusion plate 222 for diffusing the light emitted from each of the plurality of fluorescent lamps 200, So that the interval is maintained.

The liquid crystal panel 110 and the backlight unit 120 are modularized by joining the top cover 140 and the cover bottom 150 on which the system board 160 is seated from the front and rear sides respectively through the support main body 130.

The light emitted from each of the plurality of fluorescent lamps 200 of the backlight unit 120 is reflected by the reflection plate 121 and the diffusion plate 222 and the plurality of optical sheets 121 A uniform high-quality surface light source is processed and supplied to the liquid crystal panel 110 during the passage.

As described above, the present invention can be applied to a liquid crystal display device of a side-view type or direct-view type, and the present invention is not limited to the above-described embodiments, and various modifications may be made within the scope of the present invention. .

100: liquid crystal display device 100a: liquid crystal display device module
110: liquid crystal panel 120: backlight unit
121: multiple optical sheets 123: light guide plate
125: Reflector 129: LED assembly
130: Support main 140: Top cover
150: cover bolt 210: insertion groove
220: connection terminal 160: system board
170: front cover 190: protective film

Claims (10)

A liquid crystal panel in which a printed circuit board is connected through a connection member; a liquid crystal display module in which a backlight unit is modularized through a support main, a top cover and a cover bottom;
A system board located inside the cover bottom;
And a front cover covering an upper edge of the liquid crystal display module,
Wherein the cover bottom has an insertion groove protruding from the front surface to a predetermined depth in the back surface direction and on which the system board is seated,
The system board includes a controller, an inverter, an OSD (On Screen Display) board, a speaker, an adapter, and various cables for controlling a display, an audio output, or a liquid crystal display.
An on / off signal of a gate driving circuit is transmitted to the liquid crystal panel through the printed circuit board,
Wherein a connection terminal is provided at a rear surface of the insertion groove, and the system board receives video and audio signals from outside through the connection terminal.
delete The method according to claim 1,
Wherein the system board is seated in the insertion groove in a direction in which a component seat mounted with the plurality of components is directed toward the liquid crystal panel.
The method according to claim 1,
Wherein the system board is seated in the insertion groove such that a component mounting surface, in which the plurality of components are mounted, faces the backside of the cover bottom.
The method according to claim 1,
The insertion groove is provided with a screw emboss,
Wherein the system board is provided with a screw through hole corresponding to the screw embossment and the system board is seated in the insertion groove through a screw penetration hole and a fastening member inserted through the screw embossment.
The method according to claim 1,
Wherein the insertion groove includes a sliding guide slot through which the system board is slidably opened at one edge and inside of both edges connected to the one edge.
The method according to claim 6,
Wherein the sliding guide slot comprises a slide member and a sliding guide rail.
The method according to claim 1,
And a protective film is further disposed on an upper portion of the front cover.
The method according to claim 1,
The backlight unit includes a reflective plate placed on the cover bottom, a light guide plate disposed on the reflective plate, a plurality of optical sheets positioned above the light guide plate, and a light source positioned on at least one side of the light guide plate Wherein the liquid crystal display panel is located on the back surface of the liquid crystal panel.
The method according to claim 1,
Wherein the backlight unit includes a reflective plate that is seated on the cover bottom, a light source that is disposed on the reflective plate, a diffusion plate that is positioned above the light source, and a plurality of optical sheets that are positioned on the diffusion plate, Wherein the liquid crystal display panel is disposed on the back surface of the liquid crystal panel.

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