KR101619323B1 - 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, and more particularly to an assembly of a system board.

A feature of the present invention is that an embo and a pum nut, which are protruded to a predetermined height, are formed on a back face of a cover fall, and the system board is fixed to the back face of the cover through a screw at a predetermined interval.

At this time, the system board and the cover bottom are physically brought into contact with each other due to the Pam nut and the screw, so that the system board is grounded with the cover bottom, thereby shielding the electromagnetic wave generated from the system board.

Accordingly, a lightweight and thin liquid crystal display device can be realized through the deletion of the metal frame, which has been provided for shielding electromagnetic waves from the existing system board.

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

Pem nuts (pemnuts), system boards, liquid crystal displays

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, and more particularly to an assembly of a system board.

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.

These liquid crystal panels and backlights are modularized by case tops, support mains and cover bottoms.

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 includes a liquid crystal panel (not shown) and a backlight unit (not shown) surrounded by a support main (not shown) And a cover bottom 15 covering the back surface of the backlight unit (not shown) are combined at front and rear sides, respectively, and are integrated through a support main (not shown).

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.

Specifically, the system board 40 is provided on the rear surface of the cover bottom 15, and the system board 40 is surrounded by the metal plate 50.

The metal plate 50 serves to shield electromagnetic waves generated from the system board 40.

When the system board 40 and the metal plate 50 are provided on the back surface of the LCD module 10, the rear cover 30 is coupled with the front cover 20 to complete the liquid crystal display device.

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, a top cover and a cover bottom; A conductive pemnut provided on an emboss formed on the bottom of the plate bottom of the cover bottom; And a system board having a screw through hole corresponding to the Pam nut, the system board being spaced apart from the bottom surface of the cover bottom by a predetermined distance, the system board including a screw hole penetrating through the screw through hole and the Pam nut, And is coupled to a bottom surface of the burvert.

The liquid crystal display device includes a front cover covering an upper edge of the LCD module, and a rear cover covering a rear surface of the system board and being assembled with the front cover. A screw guide hole is formed, and the fastening member is inserted through the screw guide hole and penetrates the screw through hole.

At this time, the embossment has a pillar surface forming an inner hollow portion protruding in the vertical direction to the bottom surface, a horizontal surface extending in the inner horizontal direction from the upper end of the pillar surface, and a coupling hole at the center of the horizontal surface, And protrudes in a cylindrical shape from the emboss.

In addition, a thread is formed on the inner circumferential surface of the Pam nut, and the fastening member is a screw composed of a thread formed with a thread engaged with the thread and a head provided at an end of the shaft.

Here, the system board includes components including an analog / digital (A / D) board, an inverter, an OSD (on screen display) board, a speaker, an adapter, and a cable. The backlight unit includes a reflector And a light source.

As described above, the system board is grounded with the cover bottom by forming the emboss and the pam nut protruding to a predetermined height on the back face of the cover bottom and fixing the system board to the cover bottom face at a predetermined distance through the screw, There is an effect that the electromagnetic wave generated from the board is cut off.

Accordingly, a lightweight and thin liquid crystal display device can be realized by deleting a metal frame that has been provided for shielding electromagnetic waves from an existing system board.

Also, the material cost can be reduced, and the modularization time can be shortened compared with the conventional method, 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, a front cover 120 and a rear cover 120 for accommodating the liquid crystal display module 100, : 130).

3, the liquid crystal display module 100 includes a liquid crystal panel 210, a backlight unit 220, a support main body 230, (250), and a top cover (240).

First, the liquid crystal panel 210 plays a key role in image display, and includes a first substrate 212 and a second substrate 214 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 to define a pixel on the inner surface of the first substrate 212, which is usually referred to as a lower substrate or an array substrate, although not shown in the drawing, A thin film transistor (TFT) is provided at each of the intersections of the pixels and is connected in a one-to-one correspondence with the transparent pixel electrodes formed in the pixels.

On the inner surface of the second substrate 214 called an upper substrate or 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. In addition, a transparent common electrode covering these elements is provided.

A polarizing plate (not shown) for selectively transmitting only specific light is attached to the outer surfaces of the first and second substrates 212 and 214, respectively.

The printed circuit board 217 is connected to at least one edge of the liquid crystal panel 210 via a connection member 216 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 230 or the back surface of the cover bottom 250.

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 liquid crystal panel 210 having the structure described above is turned on, And the alignment direction of the liquid crystal molecules is changed by the electric field between the pixel electrode and the common electrode, thereby exhibiting a difference in transmittance.

In addition, the liquid crystal display module according to the present invention is provided with a backlight unit 220 for supplying light from the back side of the liquid crystal display module 210 so that the difference in transmittance represented by the liquid crystal panel 210 is externally expressed.

The backlight unit 220 includes an LED assembly 229, a white or silver reflective plate 225, a light guide plate 223 resting on the reflective plate 225, and a plurality of optical sheets 221 interposed therebetween .

The LED assembly 229 is disposed at one side of the light guide plate 223 so as to face the light incident surface of the light guide plate 223. The LED assembly 229 includes a plurality of LEDs 229a, And a PCB 229b mounted spaced apart.

At this time, the plurality of LEDs 229a emit light having red (R), green (G), and blue (B) colors toward the front of the light guide plate 223, ) Can be turned on at once to realize white light by color mixing.

On the other hand, using the LED 229a constituted by an LED chip (not shown) that emits all the colors of RGB, the white light may be realized in each LED 229a, or a white The LED 229a may be used.

A plurality of LEDs 229a emitting RGB light may be bundled into one cluster and a plurality of LEDs 229a mounted on the PCB 229b may be arranged in a line on the PCB 229b. It is also possible to arrange them in parallel or in a plurality of rows.

In addition, the plurality of LEDs 229a may be mounted on an FPC (not shown) other than the PCB 229b.

Instead of the LED assembly 229, a fluorescent lamp such as a cold cathode fluorescent lamp or an external electrode fluorescent lamp may be used. When such a fluorescent lamp is used, it may further include a lamp guide (not shown).

The light guide plate 223 spreads evenly over a wide area of the light guide plate 223 while the light incident from the LED 229a travels through the light guide plate 223 by total reflection several times to provide a surface light source to the liquid crystal panel 210. [

The light guide plate 223 may include a pattern of a specific shape 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, a hologram pattern, and the like in order to guide light incident into the light guide plate 223. The pattern is formed on the lower surface of the light guide plate 223 by a printing method or an injection method.

The reflection plate 225 is disposed on the back surface of the light guide plate 223 and reflects light passing through the back surface of the light guide plate 223 toward the liquid crystal panel 210 to improve the brightness of light.

The plurality of optical sheets 221 on the light guide plate 223 include a diffusion sheet and at least one light condensing sheet or the like to diffuse or condense the light passing through the light guide plate 223, Allow the light source to enter.

The liquid crystal panel 210 and the backlight unit 220 are modularized through a top cover 240, a support main 230 and a cover bottom 250. The top cover 240 is disposed on the top and side surfaces of the liquid crystal panel 210, And the front cover 240 is opened to display an image to be displayed on the liquid crystal panel 210. The liquid crystal panel 210 is a liquid crystal panel.

In addition, the cover bottoms 250, on which the liquid crystal panel 210 and the backlight unit 220 are seated and which are the basis for assembling the entire instrument of the liquid crystal display module 100, are formed into a rectangular plate shape, And vertically bent.

The support main 230 having a rectangular shape and having one opened edge which is placed on the cover bottom 250 and covers the edges of the liquid crystal panel 210 and the backlight unit 220 is supported by the top cover 240, Is combined with the bottoms 250.

In this case, the top cover 240 may be referred to as a case top or a top case, and the support main 230 may be referred to as a guide panel or a main support or a mold frame. The cover bottom 250 may be referred to as a bottom cover or a bottom cover I will.

In this case, the backlight unit 220 having the above-described structure is generally called a side light type. In accordance with the purpose, the backlight unit 220 includes a plurality of LED assemblies 229, It is also possible to intervene correspondingly.

The light guide plate 223 may be omitted if the LED assembly 229 is arranged directly in parallel with the upper surface of the reflection plate 225. In this case, the light guide plate 223 may be omitted.

The system board 140 is placed on the rear surface of the modularized liquid crystal display device module 100, that is, the backside of the cover bottom 250. The system board 140 receives an image or voice signal input from the outside, An analog / digital (A / D) board (not shown) for transmitting the signals to a speaker 210 (not shown) or the like to control display and audio output, an inverter (not shown) for driving a light source of the backlight unit 220, An on-screen display (OSD) board (not shown) for controlling functions related to the screen adjustment, a speaker (not shown) for outputting a sound signal to be input, an adapter (not shown) And various cables (not shown) are mounted.

Particularly, in the present invention, the system board 140 is fixed to the cover bottom 250 through a fastening member (not shown) such as a screw directly.

The liquid crystal display module 100 and the system board 140 are finally modularized through the front cover 120 and the rear cover 130. The front cover 120 covers the display screen edge of the liquid crystal display module And the front cover 120 is opened in a rectangular frame shape to display an image realized by the liquid crystal display module 100.

In addition, a rear cover 130 having a vertically bent predetermined height and positioned at four corners thereof is disposed on the rear surface of the LCD module 100 and the system board 140

The liquid crystal display device module 100 and the system board 140 are connected to each other by a front cover 120 covering a top edge of the liquid crystal display module 100 and a rear cover 130 covering a back surface of the system board 140, .

Thereby, the liquid crystal display device is completed.

At this time, if a pedestal (not shown) for mounting a liquid crystal display device is provided on the rear cover 130, a liquid crystal monitor device in an actual usable state is completed.

FIG. 4 is a schematic view of a system board being assembled to a cover bottom, wherein FIG. 4 is a perspective view showing a part of the back face of the cover bottom.

Meanwhile, the system board 140 is fastened to the rear surface of the cover bottom 150 together with the rear cover 130 of FIG. 2. Here, for convenience of explanation, the rear cover 130 of FIG. 2 will be omitted .

The system board 140 is fixed to the backside of the cover bottom 150 through a screw 160. At this time, a screw through hole 145 through which the screw 160 is passed is provided on the system board 140 An embossed portion 251 corresponding to the screw through hole 145 of the system board 140 is formed on the back surface of the cover bottom 250 which is in close contact with the system board 140.

The concrete shape of the embossment 251 includes a columnar surface 251a for forming an inner hollow portion protruding vertically from the backside of the cover bottom 250, a horizontal surface 251b extending inwardly in the horizontal direction from the upper end of the columnar surface 251a, And a coupling hole (not shown) is formed in the center of the horizontal surface 251b so that the screw 160 is inserted.

In addition, a pneumatic nut 253 is protruded from the embossing 251 in the coupling hole (not shown).

The Pam nuts 253 may protrude from the embossing 251 in a cylindrical shape, and a female thread (not shown) may be formed on a central inner circumferential surface of the flange 253 to guide the screw 160.

At this time, the end of the pummet nut 253 inserted in the emboss 251 is configured as a hook to prevent the pummet nut 253 from moving or coming off after being fixed from the emboss 251. [

The Pam nuts 253 are made of the same material as the cover bottoms 250, or are electrically conductive.

The nub 253 may protrude from the back surface of the cover bottom 250 together with the emboss 251 and may be integrally formed of the same material as the cover bottom 250.

The embossment 251 and the Pam nut 253 directly fix the system board 140 to the backside of the cover bottom 250 and prevent the system board 140 from directly contacting the cover bottom 250 This is to prevent electrical signals flowing through the system board 140 from coming into contact with the cover bottom 250 and being short-circuited.

The screw 160 inserted in the Pam nuts 253 and the screw penetration hole 145 includes a shaft 161 and a head 163 provided at an end of the shaft 161 similar to the shape of a general screw 160.

At this time, along the outer surface of the shaft 161, male threads corresponding to female threads (not shown) formed on the inner surface of the Pam nuts 253 are formed. The screw 160 is inserted through the screw through hole 145 of the system board 140 from the end of the shaft 161 and inserted into the Pam nut 253 formed in the emboss 251 of the cover bottom 250.

The screw through holes 145 formed in the system board 140 are formed on at least four corners of the system board 140 so that the system board 140 can be more stably fixed to the back surface of the cover bottom 250 desirable.

In the case of a liquid crystal display module (100 in FIG. 3) in which a large number of electronic devices are integrated at high density, electromagnetic waves are directly coupled to an image quality, A grounding structure is required to discharge and remove unnecessary external inflow charges such as electromagnetic waves.

3, the liquid crystal display module 100 of the present invention confirms that the cover bottom 250 of the metal and the system board 140 are physically in contact with the Pam nuts 253 through the screw 160 As a result, the system board 140 is grounded with the cover bottom 250 through the screw 160 and the Pam nuts 253, thereby shielding the electromagnetic wave generated from the system board 140 through the ground.

In this way, the metal frame (50 in FIG. 1) provided for shielding the electromagnetic waves of the existing system board 140 can be deleted.

As a result, a lightweight and thin liquid crystal display device is realized.

Generally, the metal frame (50 in FIG. 1) had a weight ratio of 40% in the liquid crystal display. Accordingly, the present invention eliminates the conventional metal frame (50 in FIG. 1) and replaces the role of the metal frame (50 in FIG. 1) through the cover bottom 250, the Pam nut 253 and the screw 160 , The liquid crystal display device can reduce the weight by at least 40% compared to the conventional one.

In addition, the material cost can be reduced by eliminating the metal frame (50 in FIG. 1), the modularization time is shortened, and the process efficiency is improved by simplifying the process.

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 140 may include a front cover 120 covering a top edge of the liquid crystal display module 100 and a rear cover 120 covering a back surface of the system board 140 130 are coupled to each other at the front and rear sides.

At this time, the liquid crystal display module 100 includes a reflective plate 225, a light guide plate 223, an LED assembly 229 provided on one side of the light guide plate 223, and a plurality of optical sheets 221 are stacked to form a backlight unit and a liquid crystal panel 210 in which a liquid crystal layer (not shown) is interposed between the first and second substrates 212 and 214 and the first and second substrates 212 and 214 is positioned thereon, Polarizing plates 219a and 219b selectively transmitting only specific light are attached to the outer surfaces of the substrates 212 and 214, respectively.

The backlight unit and the liquid crystal panel 210 are surrounded by the support main body 230 and the cover bottom 250 is coupled to the backside of the liquid crystal panel 210 and the top cover 240 are coupled to the support main body 230 and the cover bottom 250.

The system board 140 is assembled to the back surface of the LCD module 100 through the screw 160 together with the rear cover 130 on the rear surface of the cover bottom 250. At this time, And a screw through hole 145 through which the screw 160 is passed is formed on the back surface of the cover bottom 250 which is in close contact with the system board 140 An embossment 251 is formed.

A pnn nut 253 protrudes from the emboss 251 at the center of the emboss 251.

The rear cover 130 has a screw hole 131 corresponding to the screw through hole 145 and the Pam nut 253.

The head 163 of the screw 160 is not exposed to the outside of the rear cover 130 by the screw guide hole 131 so that the liquid crystal display device has a minimum thickness.

In the liquid crystal display device according to the present invention described above, the process of combining the cover bottom 250, the system board 140, and the rear cover 130 is simply summarized.

The system board 140 is attached to the system board 140 by aligning the screw through holes 145 to correspond to the Pam nuts 253 protruding from the back surface of the cover bottom 250, and aligns the rear cover 130 with the rear surface of the system board 140. [

At this time, after the rear cover 130 is aligned so that the screw guide holes 131 correspond to the screw through holes 145 and the punches 253, the screw holes 131 of the rear cover 130 and the system board The screw 160 penetrates through the screw penetration hole 145 of the cover bottom 250 and is inserted into the Pam nut 253 formed in the emboss 251 of the cover bottom 250.

Accordingly, the liquid crystal display module 100, the system board 140, and the rear cover 130 are assembled together.

At this time, the system board 140 is fixed with a certain distance from the cover bottom 250 by the emboss 251 and the Pam nut 253 formed on the back surface of the cover bottom 250.

This prevents the system board 140 from directly contacting the cover bottom 250 because the electric signal flowing through the system board 140 contacts the cover bottom 250 and is prevented from being short-circuited.

The system board 140 is fixed to the screw 160 and the Pam nut 253 by a physical contact between the metal cover plate 250 and the system board 140 via the Pam nut 253 and the screw 160. [ So that the electromagnetic wave generated from the system board 140 is blocked.

Accordingly, a lightweight and thin liquid crystal display device can be realized by removing the metal frame (50 in FIG. 1) provided for blocking the electromagnetic wave of the existing system board 140.

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

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;

4 is a view schematically showing a state in which a system board is assembled to a cover bottom.

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 (10)

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 conductive pum nut provided on an emboss formed on a bottom surface of the plate bottom of the cover bottom; A system board having a screw through hole corresponding to the Pam nut and spaced apart from the bottom surface of the cover bottom by a predetermined distance; And a rear cover which covers the rear surface of the system board and receives the liquid crystal display module and is assembled with the front cover, Wherein the system board is coupled to the bottom of the cover burr through a screw penetration hole and a fastening member inserted through the pam nut, Wherein the rear bucker comprises a screw guide hole corresponding to the Pam nut, and the fastening member is inserted through the screw guide hole and penetrates the screw through hole. delete delete The method according to claim 1, Wherein the embossment has a pillar surface forming an inner hollow portion protruding in a vertical direction to the bottom surface, a horizontal surface extending in an inner horizontal direction from an upper end of the pillar surface, and a coupling hole in the center of the horizontal surface. 5. The method of claim 4, And the Pam nut is inserted into the coupling hole and protruded from the embossment in a cylindrical shape. 6. The method of claim 5, Wherein a thread is formed on an inner peripheral surface of the Pam nut. The method according to claim 6, Wherein the fastening member is a screw composed of a screw-formed shaft engaged with the thread and a head provided at an end of the shaft. The method according to claim 1, Wherein components including an analog / digital (A / D) board, an inverter, an OSD (on screen display) board, a speaker, an adapter and a cable are mounted on a back surface of the system board. The method according to claim 1, Wherein the backlight unit includes a reflection plate, a plurality of optical sheets, and a light source. The method according to claim 1, And a printed circuit board which is connected to the liquid crystal panel through a connection member and is closely attached to a side surface of the support main body or a rear surface of the cover bottom.

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