KR101598372B1 - Liquid crystal display device - Google Patents

Abstract

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 feature of the present invention is that a liquid crystal panel and a backlight unit in a liquid crystal display module are modularized only through a support main and a cover bottom, and finally the liquid crystal display module and the system board are modularized, The front cover is assembled with the support main so that the front cover can replace the existing top cover.

Accordingly, since the front cover plays the role of the top cover of the conventional liquid crystal display device module in addition to its own role, the liquid crystal display module can be thinned by removing the top cover made of a metal material, Thereby realizing the overall lightweight and thin effect.

In addition, the material cost can be reduced, the modularization time is shortened, and the process efficiency is improved by simplifying the process.

 Front cover, rear cover, liquid crystal display module, liquid crystal display

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 having a light source is disposed on the back surface of the liquid crystal panel.

The liquid crystal panel and the backlight are modularized by the case top, the support main, and the cover bottom.

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

A liquid crystal display device includes a liquid crystal display module 10 for implementing an image and a front cover 20 and a rear cover 30 for accommodating the liquid crystal display module 10, .

Here, the general liquid crystal display module 10 is mounted on the cover detent 15 in a state where the liquid crystal panel (not shown) and the backlight unit (not shown) are surrounded by the support main body 13 having a rim And a top cover 14 covering the top edge of the liquid crystal panel (not shown) are combined with the cover bottom 15 to be integrated.

A system board 40 is further provided on the back surface of the LCD module 10 and the system board 40 is protected by a metal plate 50.

On the other hand, in recent years, such a liquid crystal display device has been widely used as a portable computer, a desktop computer monitor, and a wall-mounted television, and researches to have a massive weight and volume with a large display area It is actively proceeding.

However, in spite of efforts to manufacture a liquid crystal display device with a light weight and a thin thickness, the number of components constituting the liquid crystal display device is so large that the thinness and light weight of the liquid crystal display device are hindered.

In addition, it has a disadvantage in that the material cost is large and the assembling and disassembling processes of the liquid crystal display device are complicated.

SUMMARY OF THE INVENTION It is a first object of the present invention to realize a light and thin liquid crystal display device.

A second object of the present invention is to shorten the assembling time and the material cost in the process of modularization of the liquid crystal display device.

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 and a cover bottom; A system board provided on a rear surface of the cover bottom; And a rear cover covering the rear surface of the system board and being assembled with the front cover. The rear cover may include a front cover and a rear cover.

Further, the present invention provides 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 and a cover bottom; A system board provided on a rear surface of the cover bottom; And a rear cover covering the rear surface of the system board and being assembled with the front cover. The rear cover may include a front cover and a rear cover.

The front cover has a rectangular shape having first to fourth edges, the first to fourth edges being folded in a "a" shape in a cross section, the first to fourth edges covering a top edge of the liquid crystal panel And a second portion perpendicular to the first portion and covering a side edge of the support main.

In addition, a supporting portion for supporting the liquid crystal display module is formed in a second portion of the first edge, and a locking protrusion protruding perpendicularly to the second portion is formed in each second portion of the second to fourth edges , And the support main corresponding to the engagement protrusion is formed with a locking protrusion.

Here, the backlight unit includes a reflection plate, a plurality of optical sheets, and a light source.

As described above, in the liquid crystal display device module, the liquid crystal panel and the backlight unit are modularized only through the support main and the cover bottom, and the liquid crystal display module and the system board are finally modularized, And the front cover to be completed is assembled with the support main body so that the front cover plays the role of the top cover of the conventional liquid crystal display device module in addition to the unique role of the front cover, The module can be thinned, and the effect of the light weight and thinness of the entire liquid crystal display device can be realized.

In addition, the material cost can be reduced, the modularization time can be shortened, and the process efficiency can be improved by simplifying the process.

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

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

2, the liquid crystal display includes a liquid crystal display module 100 for implementing an image and a front cover 200 and a rear cover 200 for accommodating the liquid crystal display module 100. [ : 300).

3, the liquid crystal display module 100 includes a liquid crystal panel 110, a backlight unit 120, a support main 130, a cover bottom 150, ).

First, the liquid crystal panel 110 plays a key role in image display. The first substrate 112 and the second substrate 114, which are bonded to each other with a liquid crystal layer interposed therebetween, . At this time, a plurality of gate lines and data lines intersect with each other on the inner surface of the first substrate 112, which is usually referred to as an array substrate, although not shown in the drawing, on the premise that the active matrix method is employed. Pixels are defined, And a thin film transistor (TFT), which are connected in a one-to-one correspondence with the transparent pixel electrodes formed in the respective pixels.

On the inner surface of the second substrate 114 called a color filter 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.

On the inner surface of the second substrate 114, transparent common electrodes covering the respective color filters and the black matrix are provided.

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

The printed circuit board 117 is connected to at least one edge of the liquid crystal panel 110 via a connection member 116 such as a flexible circuit board or a tape carrier package (TCP) And is properly brought into close contact with the side surface of the main body 130 or the back surface of the cover bottom 150.

In the liquid crystal panel 110 having the above-described structure, when the thin film transistor selected for each gate line is turned on by the on / off signal of the gate driving circuit to be scanned, the signal voltage of the data driving circuit And the alignment direction of the liquid crystal molecules in the liquid crystal layer is changed by the electric field between the pixel electrode and the common electrode.

In addition, the LCD module 100 according to the present invention is provided with a backlight unit 120 for supplying light from the backside of the liquid crystal display module 100 so that a difference in transmittance represented by the liquid crystal panel 110 is externally expressed.

The backlight unit 120 includes a lamp 124 arranged along the longitudinal direction of at least one edge of the support main 130, a white or silver reflection plate 125, and a light guide plate 123 resting on the reflection plate 125. [ And an optical sheet 121 interposed therebetween.

Further, although not shown, a light shielding tape may be further provided between the optical sheet 121 and the liquid crystal panel 110 so as to shield the light from being leaked to a portion outside the screen display area of the liquid crystal panel 110.

The lamp guide 126 is disposed on the upper and lower sides of the lamp 124 in such a state that the inner side facing the light guide plate 123 is opened and the lamp 124 And the light is concentrated in the direction of the light guide plate 123.

The lamp 124 may be a fluorescent lamp such as a cold cathode fluorescent lamp or an external electrode fluorescent lamp as a light source. Alternatively, in addition to such a fluorescent lamp, a light-emitting diode lamp may be used as the lamp 124, and a lamp guide may be omitted when a light-emitting diode lamp is used.

The light guide plate 123 uniformly spreads over the wide area of the light guide plate 123 to provide a surface light source to the liquid crystal panel 110 as the light incident from the lamp 124 travels through the light guide plate 123 by total reflection several times.

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

Here, the pattern may be formed in various shapes such as an elliptical pattern, a polygon pattern, and a hologram pattern in order to guide light incident into the light guide plate 123, The same pattern is formed on the lower surface of the light guide plate 126 by a printing method or an injection method.

The reflection plate 125 is disposed on the back surface of the light guide plate 123 and reflects light passing through the back surface of the light guide plate 123 toward the liquid crystal panel 110 to improve the brightness and efficiency of light.

The optical sheet 121 on the light guide plate 123 includes a diffusion sheet, at least one light condensing sheet, and the like.

Here, the diffusion sheet is positioned directly above the light guide plate 123, and serves to adjust the direction of light so that the light travels toward the light condensing sheet while dispersing the light incident through the light guide plate 123.

The light diffused through the diffusion sheet is condensed in the direction of the liquid crystal panel 110 by the condensing sheet. Therefore, the light passing through the light condensing sheet is almost perpendicular to the liquid crystal panel 110.

Meanwhile, the backlight unit 120 having the above-described structure is called a side light type, and a plurality of lamps 124 may be arranged in multiple layers along the longitudinal direction of one edge of the support main 130, It is also possible to arrange them in parallel along the inner longitudinal direction of both edges of the main body 130 facing each other.

The liquid crystal panel 110 and the backlight unit 120 are modularized through the support main body 130 and the cover bottom 150.

The support main body 130 has a square shape having a protrusion 131 for separating the positions of the liquid crystal panel 110 and the backlight unit 120 from the inside of the support main body 130. The support main body 130 includes the liquid crystal panel 110 and the backlight unit 120, And is assembled with the cover bottom 150.

The cover bottom 150 assembled with the support main body 130 is based on assembling the entire liquid crystal display module 100 with the liquid crystal panel 110 and the backlight unit 120 being seated therebetween. 150 are formed in the shape of a single plate having a square shape and the four edges thereof are vertically bent to a predetermined height.

At this time, the support main body 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 or a bottom cover.

The system board 400 is placed on the rear surface of the modularized liquid crystal display module 100, that is, the backside of the cover bottom 150. The system board 400 receives external video or audio signals, An analog / digital (A / D) board (not shown) for transmitting the signals to a speaker (not shown) or the like and controlling a display or an audio output, an inverter (not shown) for driving the lamp 124 of the backlight unit 120 An on-screen display (OSD) board (not shown) for controlling functions related to picture adjustment, a speaker (not shown) for outputting a sound signal to be input, an adapter And various cables (not shown) are mounted.

The system board 400 is protected by a metal plate 500.

The metal plate 500 serves to cut off electromagnetic waves generated from the system board 400.

The liquid crystal display device module 100 and the system board 400 are finally modularized through the front cover 200 and the rear cover 300. The front cover 200 is disposed on the edge of the display screen of the liquid crystal display module 100 And the front cover 200 is opened to display an image realized by the liquid crystal display module 100.

The front cover 200 of the present invention is assembled with the rear cover 300 and is assembled with the support main body 130 of the LCD module 100.

In addition, a rear cover 300 having a rectangular shape and four sides vertically bent at a predetermined height is placed on the back of the LCD module 100 and the system board 400

The liquid crystal display device module 100 and the system board 400 are connected to each other by a front cover 200 covering the top edge of the liquid crystal display module 100 and a rear cover 300 covering the rear surface of the system board 400, .

Thereby, the liquid crystal display device is completed.

At this time, when a pedestal (not shown) for mounting a liquid crystal display device is provided on the rear cover 300, a liquid crystal monitor device in a practically usable state is completed.

Accordingly, the present invention enables the LCD module 100 to be thin and lightweight, and simplifies the process. Also, the process cost can be reduced.

The liquid crystal display module 100 according to the present invention modulates the liquid crystal panel 110 and the backlight unit 120 only through the support main body 130 and the cover bottom 150, The device module 100 and the system board 400 are finally modularized through the front cover 200 and the rear cover 300 in order to complete a liquid crystal monitor device in an actual usable state.

The front cover 200 is assembled with the rear cover 300 and is assembled with the support main 130 of the LCD module 100. The front cover 200 includes the liquid crystal panel 110, A front surface of the front cover 200 is opened to cover an upper edge of the front cover 200 and a side edge of the support main 130, .

Therefore, the front cover 200 is replaced with the role of the top cover (14 in FIG. 1) of the conventional liquid crystal display device module 100 in addition to the unique role of the front cover 200 itself.

Accordingly, the liquid crystal display module 100 can be thinned by removing the top cover (14 in FIG. 1) made of a metal material, so that the lightweight and thin overall effect of the liquid crystal display device can be obtained. It brings the effect of easy assembly.

Further, due to the elimination of the top cover (14 in Fig. 1), the process cost can also be reduced.

4A and 4B are bottom perspective views of the structure of the front cover according to the embodiment of the present invention, and FIG. 4C is a sectional view taken along line IV-IV 'of FIG. 4B.

As shown in FIGS. 4A and 4B, the support member (not shown) serves to firmly support the upper portion of the liquid crystal display module 100 (see FIG. 3) The front cover 200 assembled with the rear cover 300 of FIG. 2, which finally modularizes the system board 100 of FIG. 2 and the system board 400 of FIG. 2, (130 in Fig. 3) for modulating the edge of the backlight unit (110 in Fig. 3) and the backlight unit (120 in Fig. 3).

In more detail, the front cover 200 includes first to fourth edge portions 210, 220, 230, and 240 to expose an image formed on a liquid crystal panel (110 in FIG. 3) The first to fourth edge portions 210, 220, 230 and 240 may include first portions 210a, 220a, 230a, and 240a covering the top edge of the liquid crystal panel 110 And second portions 210b, 220b, 230b, and 240b that cover the side edges of the support main body (130 in FIG. 3) perpendicular to the first side surfaces 210a, 220a, 230a, and 240a.

At this time, when the first edge portion 210 of the front cover 300, that is, the rear cover (300 of FIG. 2) is assembled and assembled to provide a pedestal (not shown) The first portion 210a of the first side edge portion 210 to be positioned on the lower side includes an operation button (not shown) for allowing a user using the liquid crystal monitor device in an actual usable state to operate the liquid crystal monitor device 230a, 240a of the second to fourth edge portions 220, 230, 240 so that an on-screen display (OSD) is positioned thereon.

Here, the OSD (not shown) refers to a function of directly displaying information required by the user or information to be known to the liquid crystal monitor device on the screen. Some of these information include brightness and contrast, tuning, RGB adjustments, and the size and position of the screen.

At this time, when the finally modularized liquid crystal monitor device is vertically erected by the front cover 200 and the rear cover 300 (see FIG. 2), the first edge portion 210 of the front cover 200, The second portion 210b of the first edge portion 210 is formed so as not to cover the region where the image of the liquid crystal panel (110 of FIG. 3) of the liquid crystal display module 100 Is formed with a support portion 210c for supporting a liquid crystal display module (100 in Fig. 3).

That is, the opened front face of the front cover 200 corresponds to the display area of the liquid crystal panel (110 in Fig. 3) in which the image of the liquid crystal display module (100 in Fig. 3) is implemented.

A plurality of support portions 210c may be provided at a predetermined interval in the second portion 210b of the first edge portion 210. [

3) 100 is mounted on the second portions 220b, 230b, and 240b covering the side edges of the support main (130 in FIG. 3) of the second to third edges 220, The support protrusions 220c, 230c, and 240c for assembling with the support main body 130 of FIG. 3 are formed.

Referring to FIG. 4C, the latching protrusions 220c, 230c, and 240c are disposed at the distal ends of the second portions 220b, 230b, and 240b, respectively, 230b, and 240b.

It is preferable that at least two of the engaging protrusions 220c, 230c and 240c are provided in the respective second portions 220b, 230b and 240b of the second to third edges 220, 230 and 240, It is easily understood by those skilled in the art that the number of the front cover 200 and the liquid crystal display module (100 in FIG. 3) can be increased, though the number is not limited.

Fig. 5 is a cross-sectional view schematically showing a partial cross-section of the modular Fig. 2, and Fig. 6 is an enlarged view of a region A of Fig.

5, the liquid crystal display module 100 and the system board 400 include a front cover 200 covering a top edge of the liquid crystal display module 100 and a rear cover 200 covering a rear surface of the system board 400 300 are coupled to each other at the front and rear sides.

At this time, the liquid crystal display module 100 includes a reflector 125, a light guide plate 123, a lamp 124 provided on one side of the light guide plate 123, a lamp guide 126, The sheets 121 are stacked to form a backlight unit 120. A liquid crystal panel 110 is disposed on the first and second substrates 112 and 114 and a liquid crystal layer (not shown) interposed therebetween And polarizing plates 119a and 119b selectively transmitting only specific light are attached to the outer surfaces of the first and second substrates 112 and 114, respectively.

The backlight unit 120 and the liquid crystal panel 110 are surrounded by the support main body 130, and the cover bottom 150 is coupled to the back surface of the backlight unit 120 and the liquid crystal panel 110 to be integrated.

The system board 400 is located on the rear surface of the cover bottom 150, and the system board 400 is protected by the metal plate 500.

Particularly, the liquid crystal display device module 100 of the present invention has a structure in which a conventional top cover (14 in FIG. 1) is removed, and finally the liquid crystal display device module 100 and the system board 400 of the present invention are modularized The front cover 200 is assembled with the support main body 130 of the liquid crystal display module 100 so as to serve as a deleted top cover 14 in Fig.

That is, the front cover 200 is assembled together with the rear cover 300 and the support main body 130 of the liquid crystal display module 100 at the same time.

Accordingly, the front cover 200 can replace the existing top cover (14 in FIG. 1) of the liquid crystal display module 100 in addition to the original role of the front cover 200 itself.

Accordingly, the liquid crystal display module 100 can be thinned by removing the top cover (14 in FIG. 1) made of a metal material, so that the lightweight and thin overall effect of the liquid crystal display device can be obtained. It brings the effect of easy assembly.

Further, due to the elimination of the top cover (14 in Fig. 1), the process cost can also be reduced.

6, the edge portion 220 of the front cover 200 is coupled to the liquid crystal panel 110 (see FIG. 6). As shown in FIG. 6, And a second portion 220b covering the side surface of the support main 130. The second portion 220b of the front cover 200 includes a first portion 220a covering the upper surface thereof and a second portion 220b covering the side surface of the support main 130, And the front cover 200 is assembled with the support main body 130 of the LCD module 100 through the engagement protrusion 220c.

The engagement protrusion 133 is formed on the outer surface of the support main body 130 facing the second portion 220b of the front cover 200 to correspond to the engagement protrusion 220c of the front cover 200 .

The liquid crystal panel 110 and the backlight unit 120 are modularized only through the support main body 130 and the cover bottom 150 in the liquid crystal display module 100 and the liquid crystal display module 100 and the system The front cover 200 is finally assembled with the support main 130 by modularizing the board 400 so that the front cover 200 completed by the user can be assembled with the support main 130, 14) in Fig.

1) of the liquid crystal display device 100. In this way, the front cover 200 plays the role of a top cover (14 in Fig. 1) of the conventional liquid crystal display device module 100 in addition to its own role, 14), it is possible to thin the liquid crystal display module 100, thereby realizing the lightweight and thin effect of the liquid crystal display as a whole.

In addition, the material cost can be reduced, the modularization time is shortened, and the process efficiency is improved by simplifying the process.

Although the front cover 200 is assembled to the support main body 130 of the liquid crystal display module 100 in the above description and drawings but the support main body 130 is located inside the edge of the cover bottom 150 The front cover 200 is assembled with the rear cover 300 and assembled with the cover bottom 150.

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

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

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

3 is an exploded perspective view of the liquid crystal display module of FIG. 2;

4A and 4B are perspective views schematically showing a structure of a front cover according to an embodiment of the present invention.

4C is a cross-sectional view taken along line IV-IV 'of FIG. 4B.

Fig. 5 is a cross-sectional view schematically showing a partial cross section of Fig. 2 modularized; Fig.

6 is an enlarged view of the area A in Fig. 5; Fig.

Claims (7)

A liquid crystal display module in which a liquid crystal panel and a backlight unit are modularized through a support main and a cover bottom; A system board provided on a rear surface of the cover bottom; And a rear cover covering the back surface of the system board and being assembled with the front cover, wherein the back cover is fixed to the support main body, The front cover has a rectangular frame shape having first to fourth edges, and a locking protrusion protruding perpendicularly to the second portion is formed in a second portion covering the side edges of the support main of the second to fourth edges And the support main corresponding to the engagement protrusion is configured to engage with the engagement protrusion. delete The method according to claim 1, Wherein the front cover has a rectangular frame shape in which the cross section is bent in the "a" shape. The method of claim 3, Wherein the first to fourth edges comprise a first portion covering the top edge of the liquid crystal panel and the second portion perpendicular to the first portion. 5. The method of claim 4, And the second portion of the first edge has a supporting portion for supporting the liquid crystal display module. delete The method according to claim 1, Wherein the backlight unit includes a reflection plate, a plurality of optical sheets, and a light source.

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