KR102456054B1 - Liquid Crystal Display device - Google Patents

Abstract

The present invention relates to a liquid crystal display device having a light weight and thin shape and a narrow bezel, and more particularly, to a liquid crystal display device having a light weight and thin shape and a narrow bezel in which bending or distortion is prevented.
A feature of the present invention is that the liquid crystal panel and the backlight unit are modularized only through the guide light and the cover bottom, and the cover bottom acts as an outer cover, so that the liquid crystal display device can be lightweight and thin, and the process is simplified. do. In addition, the process cost can be reduced.
In addition, although the liquid crystal display device is lightweight and thin, by further providing a reinforcing bar on the back side of the cover bottom, it is possible to prevent the liquid crystal display device from bending or twisting, thereby causing light leakage or damage to internal components. It can also be prevented from occurring.

Description

Liquid Crystal Display Device

The present invention relates to a liquid crystal display device having a light weight and thin shape and a narrow bezel, and more particularly, to a liquid crystal display device having a light weight and thin shape and a narrow bezel in which bending or distortion is prevented.

A liquid crystal display device (LCD), which is advantageous for displaying moving images and has a large contrast ratio, is actively used in TVs and monitors, etc. shows the principle of image realization by

Such a liquid crystal display device consists of a liquid crystal panel bonded together with a liquid crystal layer interposed between two parallel substrates as an essential component, and the transmittance difference is realized by changing the arrangement direction of liquid crystal molecules with an electric field in the liquid crystal panel. do.

However, since the liquid crystal panel does not have a self-luminous element, a separate light source is required to display the difference in transmittance as an image.

1 is a cross-sectional view of a general liquid crystal display module.

As shown, a general liquid crystal display module includes a liquid crystal panel 10 , a backlight unit 20 , a guide panel 30 , a cover bottom 50 , and a top cover 40 .

At this time, the liquid crystal panel 10 is a part that plays a key role in image expression, and is composed of first and second substrates 12 and 14 bonded face to face with a liquid crystal layer interposed therebetween, and the first and second substrates ( First and second polarizing plates 19a and 19b for controlling the polarization direction of light are provided on the outer surfaces of 12 and 14, respectively.

In addition, a backlight unit 20 is provided behind the liquid crystal panel 10 .

The backlight unit 20 includes an LED assembly 29 arranged along the longitudinal direction of at least one edge of the guide panel 30, a white or silver reflector 25 seated on the cover bottom 50, and such a reflector ( 25) and a light guide plate 23 seated on the light guide plate 23 and a plurality of optical sheets 21 interposed thereon.

At this time, the LED assembly 29 is configured on one side of the light guide plate 23 and includes a plurality of LEDs 29a emitting white light and an LED printed circuit board (PCB) 29b on which the LEDs 29a are mounted. The LED housing 28 for dissipating high-temperature heat generated from the LED 29a to the outside is located outside the assembly 29 .

The liquid crystal panel 10 and the backlight unit 20 have a top cover 40 surrounding the upper surface edge of the liquid crystal panel 10 in a state in which the edge is surrounded by a guide panel 30 having a rectangular frame shape, and the back surface of the backlight unit 20 . The cover bottom 50 covering the are coupled in front and rear, respectively, and are integrated through the guide panel 30 .

A liquid crystal display module having such a configuration is used in the manufacture of finished liquid crystal display devices (=hereinafter referred to as liquid crystal display devices) such as TVs and monitors, and in general, the liquid crystal display device has a front cover ( 70) and a rear cover 60 coupled thereto are provided.

On the other hand, in recent years, such liquid crystal display devices are increasingly being used in portable computers as well as desktop computer monitors and wall-mounted televisions. is being actively pursued.

However, despite the efforts to manufacture the liquid crystal display device in a light and thin shape, there are too many components constituting the liquid crystal display device, which hinders the thin and light weight of the liquid crystal display device.

In addition, there are disadvantages in that the material cost is high, and the assembly and disassembly process of the liquid crystal display device is complicated.

In particular, in recent years, it has been required that the liquid crystal display device be lightweight and thin, and the display area should be wide and the bezel area, which is a non-display area other than the display area, should be formed as small as possible.

A first object of the present invention is to provide a liquid crystal display device having a narrow bezel while reducing process cost and reducing weight and volume. do it with

In addition, a second object is to reduce assembly time and material cost in the modularization process of the liquid crystal display device.

In addition, a third object is to secure the rigidity of a liquid crystal display device having a light weight, a thin shape, and a narrow bezel.

In order to achieve the object as described above, the present invention provides an LED assembly including a plurality of LEDs, a light guide plate facing the plurality of LEDs and a light incident surface, an optical sheet positioned above the light guide plate, and a lower portion of the light guide plate A cover bottom provided with a backlight unit including a reflective plate positioned thereon, a liquid crystal panel positioned above the backlight unit, a lower surface on which the backlight unit is seated, and an LED assembly seating part on one edge of which the LED assembly is positioned; Adjacent to the mounting portion of the LED assembly, and a reinforcing bar mounted on the rear surface of the cover, wherein the reinforcing bar has a bar shape corresponding to the longitudinal direction of the cover butum, and is opposite to the rear surface of the cover. There is provided a liquid crystal display including a first reinforcing end and a second reinforcing end vertically bent from the first reinforcing end to surround the outside of the LED assembly seating portion.

In this case, the reinforcing bar and a part of the rear surface of the cover bottom are the outermost structures of the entire rear surface of the liquid crystal display device, and a screw embossing is provided on the rear surface of the cover bottom, and a screw is provided at the first reinforcing end corresponding to the screw embossing. A guide hole is provided.

In addition, the reinforcing bar is assembled and fastened with the cover bottom in a convexly bent state toward the rear surface of the cover bottom, and a tensile stress is applied to both ends perpendicular to the longitudinal direction of the liquid crystal display device, and the LED assembly seating portion is the cover. A first curved surface bent downward from the lower surface of the batum, and a second curved surface vertically bent outwardly so as not to face the lower surface from the first curved surface, the LED assembly is the PCB on which the LED is mounted One surface of the PCB is in close contact with the first curved surface, and the lower surface of the PCB is in close contact with the second curved surface.

In addition, one surface of the PCB is attached to the first curved surface through a first adhesive member, and a guide light is provided outside the LED assembly seated on the LED assembly seating part.

The guide light includes a vertical portion in close contact with the outer surface of the PCB of the LED assembly, and a horizontal portion vertically bent from the vertical portion to cover an upper region of the LED assembly, wherein the horizontal portion is above the light incident surface of the light guide plate It extends to the region, and a protection member is provided between the horizontal portion and the upper region of the light incident surface of the light guide plate.

In addition, the other edge of the cover bottom includes a side surface vertically bent upward from the bottom surface, and an upper surface vertically bent to face the bottom surface from the side surface, and the liquid crystal panel moves toward a horizontal portion of the guide panel and an upper surface of the top surface. The rear edge is supported and attached through a second adhesive member, and one edge provided with the LED assembly mounting part forms a support end of the liquid crystal display device, and is inserted into the guide groove of the base, so that the liquid crystal display device is vertical erected and fixed

As described above, according to the present invention, the liquid crystal display device is modularly integrated with the liquid crystal panel and the backlight unit only through the guide light and the cover bottom, and the cover bottom acts as an outer cover, thereby reducing the light weight and thinness of the liquid crystal display device. possible, and has the effect of bringing about the simplification of the process.

In addition, there is an effect that can reduce the process cost.

In addition, although the liquid crystal display device is lightweight and thin, by further providing a reinforcing bar on the back side of the cover bottom, it is possible to prevent bending or distortion of the liquid crystal display device from occurring, thereby causing light leakage or internal configuration. It also has the effect of preventing element breakage from occurring.

1 is a cross-sectional view of a general liquid crystal display module.
2 is an exploded perspective view schematically illustrating a liquid crystal display according to an embodiment of the present invention;
3 is a cross-sectional view schematically illustrating a state in which the modularized liquid crystal display of FIG. 2 is fixed to a pedestal;
4A is a schematic diagram schematically illustrating a liquid crystal display device and a reinforcing bar;
4B to 4C are schematic views schematically illustrating a state in which a tensile stress is applied to a liquid crystal display device by a reinforcement bar.
5 is a graph of experimental results of measuring the amount of warpage of the liquid crystal display according to the presence or absence of a reinforcement bar according to an embodiment of the present invention.

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

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

As shown, the liquid crystal display 100 according to the embodiment of the present invention is largely composed of a liquid crystal panel 110 , a backlight unit 120 , a guide light 130 , and a cover bottom 150 .

At this time, if the direction in the drawing is defined for convenience of description, the backlight unit 120 is disposed behind the liquid crystal panel 110 on the premise that the display surface of the liquid crystal panel 110 faces forward, and the backlight unit 120 ) on the rear surface of the cover bottom 150 is located.

Let's take a closer look at each of these.

First, the liquid crystal panel 110 is a part that plays a key role in image expression, and includes a first substrate 112 and a second substrate 114 bonded to each other with a liquid crystal layer interposed therebetween.

At this time, although not shown in the drawing under the premise of the active matrix method, a plurality of gate lines and data lines intersect to define a pixel on the inner surface of the first substrate 112, which is usually called a lower substrate or an array substrate, A thin film transistor (TFT) is provided at each intersection and is connected to the transparent pixel electrode formed in each pixel in a one-to-one correspondence.

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

In addition, polarizing plates 119a and 119b (refer to FIG. 3 ) for selectively transmitting only specific light are attached to the outer surfaces of the first and second substrates 112 and 114 , respectively.

The printed circuit board 117 is connected along at least one edge of the liquid crystal panel 110 through a connection member 116 such as a flexible circuit board or a tape carrier package (TCP).

In the liquid crystal panel 110, when the thin film transistor selected for each gate line is turned on by the on/off signal of the gate driving circuit, the signal voltage of the data driving circuit is transferred to the corresponding pixel electrode through the data line, The arrangement direction of liquid crystal molecules is changed by the electric field between the pixel electrode and the common electrode, indicating a difference in transmittance.

In addition, the liquid crystal display device 100 according to the present invention is provided with a backlight unit 120 that supplies light from a rear surface thereof so that a difference in transmittance displayed by the liquid crystal panel 110 is expressed to the outside.

The high-brightness surface light source implemented from the backlight unit 120 is provided to the liquid crystal panel 110 , and the liquid crystal panel 110 displays an image.

The backlight unit 120 includes an LED assembly 129 arranged along at least one edge in the longitudinal direction of the cover bottom 150 , a reflecting plate 125 , a light guide plate 123 mounted on the reflecting plate 125 , and and an optical sheet 121 positioned above the light guide plate 123 .

The LED assembly 129 is positioned on one side of the light guide plate 123 to face the light incident surface of the light guide plate 123 , and the LED assembly 129 includes a plurality of LEDs 129a and a plurality of LEDs 129a at regular intervals. It includes a PCB (129b) mounted to be spaced apart.

At this time, the plurality of LEDs 129a emit light having red (R), green (G), and blue (B) colors in a forward direction toward the light incident surface of the light guide plate 123 , and the plurality of RGB LEDs 129a ) can be turned on at once to realize white light by color mixing.

Recently, in order to improve luminous efficiency and luminance, a blue LED 129a including a blue LED chip having excellent luminous efficiency and luminance is used, and 'cerium-doped yttrium aluminum garnet (YAG:Ce)', that is, yellow as a phosphor. A blue LED 129a made of a phosphor is used.

The blue light emitted from the LED 129a passes through the phosphor and mixes with the yellow light emitted by the phosphor, thereby realizing white light.

At this time, the temperature of the LED 129a of the LED assembly 129 increases rapidly according to the use time, and this temperature increase is accompanied by a change in the lifespan and luminance of the LED 129a.

Therefore, when using the LED 129a as the light source of the backlight unit 120, one of the most important considerations is a heat dissipation design according to the temperature rise of the LED 129a, and the backlight unit 120 of the present invention. In the PCB (129b) on which a plurality of LEDs 129a of the LED assembly 129 are mounted, a thermoelectric such as a Metal Core Printed Circuit Board (MCPCB) so that the high-temperature heat generated from the LEDs 129a can be effectively radiated to the outside. It should be made of a material with excellent conductivity.

In addition, by forming the area and thickness of the PCB 129b to be thicker, the high-temperature heat generated from the LED 129a is rapidly and efficiently radiated to the outside through the PCB 129b.

The light guide plate 123 to which the light emitted from the plurality of LEDs 129a of the LED assembly 129 is incident is the light guide plate 123 while the light incident from the LEDs 129a proceeds through the light guide plate 123 by total reflection several times. ) evenly spread over a wide area to provide a surface light source to the liquid crystal panel 110 .

The light guide plate 123 may include a pattern having a specific shape on its lower surface in order to supply a uniform surface light source. Here, the pattern may be variously configured such as an elliptical pattern, a polygonal pattern, a hologram pattern, etc. in order to guide the light incident into the light guide plate 123 . The pattern is formed on the lower surface of the light guide plate 123 by a printing method or an injection method.

The reflection plate 125 is located on the rear surface of the light guide plate 123 , and reflects the light passing through the rear surface of the light guide plate 123 toward the liquid crystal panel 110 to improve the luminance of the light.

The optical sheet 121 on the light guide plate 123 includes a diffusion sheet and at least one light collecting sheet, and various functional sheets such as a reflective polarizing film called a dual brightness enhancement film (DBEF) may be included.

The light passing through the light guide plate 123 is diffused or condensed in the process of passing through the optical sheet 121 to be processed into a high-quality surface light source, so that a more uniform surface light source is incident on the liquid crystal panel 110 .

The liquid crystal panel 110 and the backlight unit 120 are integrally modularized through the guide light 130 and the cover bottom 150 .

The guide light 130 has a bar shape corresponding to one edge on which the LED assembly 129 is positioned, and includes a vertical portion 131 and a horizontal portion 133 vertically bent from the vertical portion 131 in cross section. It has a bent shape in this “a” shape.

In the guide light 130 , the vertical portion 131 surrounds the side surface of the LED assembly 129 , and the horizontal portion 133 surrounds the upper area of the LED assembly 129 and the upper area of the light incident portion of the light guide plate 123 . Thus, it is formed to surround all the outside of the LED assembly 129 .

Accordingly, the light emitted from the LED assembly 129 is concentrated in the direction of the light guide plate 123 to prevent the light emitted from the LED assembly 129 from leaking out of the backlight unit 120 .

In addition, the guide light 130 is made of a thin stainless steel (SUS) material, and serves to reflect light leaking to the outside in the direction of the light guide plate 123 , and has a predetermined rigidity to form a modular liquid crystal display device 100 . ) of the LED assembly 129 is positioned to support and protect one edge.

In addition, the cover bottom 150, which is the basis for assembling the entire structure of the liquid crystal display device 100, includes a plate-shaped lower surface 151 on which the backlight unit 120 is seated, and an LED assembly of the lower surface 151 ( 129), except for one edge on which the other three edges are positioned, are formed of side surfaces 153a, 153b, and 153c bent vertically upward.

Here, the upward direction defines one direction toward the liquid crystal panel 110 seated on the cover bottom 150 .

At this time, the first side 153a facing one edge on which the LED assembly 129 is positioned is vertically bent from the first side toward one edge where the LED assembly is positioned so that the upper surface 155 opposite to the lower surface 151 is formed. In addition, the LED assembly 129 is provided with an LED assembly seating portion 157 on one edge is located.

The LED assembly seating part 157 includes a first curved surface 157a that is vertically bent downwardly from the lower surface 151, and a second that is vertically bent outwardly so as not to face the lower surface 151 from the first curved surface 157a. and a curved surface 157b.

The LED assembly 129 is attached and fixed to the LED assembly mounting part 157 through the first adhesive member 160a (refer to FIG. 3 ).

And the liquid crystal panel 110 has a rear edge through the second adhesive member 160b (refer to FIG. 3) having adhesiveness to the horizontal portion 133 of the guide light 130 and the upper surface 155 of the cover bottom 150. attached and fixed.

That is, in the liquid crystal display 100 according to the embodiment of the present invention, a reflective plate 125 and a light guide plate 123 are sequentially positioned on the lower surface 151 of the cover bottom 150 , and the light guide plate 123 moves toward one side. The positioned LED assembly 129 is attached and fixed to the LED assembly seating portion 157 of the cover bottom 150 through a first adhesive member 160a (see FIG. 3 ), and the liquid crystal panel 110 is a guide light ( 130), the cover bottom 150 and the second adhesive member 160b (refer to FIG. 3) are attached and fixed through the liquid crystal panel 110 and the backlight unit 120 to form the guide light 130 and the cover bottom 150. ) to be integrated into a modular unit.

In the liquid crystal display device 100 according to the embodiment of the present invention, the cover bottom 150 serves as an outer cover of a display device such as a notebook computer, a mobile device, and a TV.

That is, the liquid crystal display 100 according to the embodiment of the present invention modularizes the liquid crystal panel 110 and the backlight unit 120 through the cover bottom 150 and the guide light 130, and the liquid crystal display 100 ) is directly connected to the pedestal 180 (refer to FIG. 3 ), thereby forming a finished product of the liquid crystal display device in a state that can be actually used by the user.

Through this, according to the present invention, light weight and thinness of the liquid crystal display device 100 are possible, and the process is simplified. In addition, the process cost can be reduced.

Looking at this in more detail, the liquid crystal display 100 of the present invention modulates the liquid crystal panel 110 and the backlight unit 120 through only the guide light 130 and the cover bottom 150, and the cover bottom 150 itself. also serves as an outer cover, so that the existing top cover (40 in FIG. 1) and the guide panel (30 in FIG. 1), and a separate front cover (70 in FIG. 1) and rear for accommodating the liquid crystal display module The configuration of the cover ( 60 in FIG. 1 ) may also be omitted.

As described above, the effect of light weight and thinness is brought about through the omission of a plurality of components, and in particular, by omitting the top cover ( 40 in FIG. 1 ) made of a metal material, etc., a lighter liquid crystal display device 100 is provided. be able to do

In particular, since a separate component does not exist in front of the liquid crystal panel 110 , the display area of the liquid crystal panel 110 is not covered, and the display area is expanded while at the same time being a bezel area, which is a non-display area other than the display area. The liquid crystal display 100 having a narrow bezel that can be reduced may also be provided.

Meanwhile, as the liquid crystal display 100 according to the embodiment of the present invention is lightweight and thin as described above, thermal deformation occurs in the process of driving the liquid crystal panel 110 and the backlight unit 120 .

In particular, the thermal deformation is caused by the temperature difference between the edge portion where the LED assembly 129 is located and the central portion where the LED assembly 129 is not located. When the components for modularization, in particular, the backlight unit 120 are seated, bending or twisting of the cover bottom 150 made of a metal material occurs, which in turn causes the entire liquid crystal display device 100 to be bent or twisted. do.

Such bending or distortion of the liquid crystal display device 100 causes light leakage and also causes damage to internal components such as the liquid crystal panel 110 .

Accordingly, the liquid crystal display 100 according to the embodiment of the present invention is characterized in that it further includes the reinforcing bar 200 on the rear surface of the cover bottom 150 .

3 is a cross-sectional view schematically illustrating a state in which the modularized liquid crystal display of FIG. 2 is fixed to a pedestal.

As shown, the liquid crystal display device according to the embodiment of the present invention has an LED assembly 129 including a reflecting plate 125 , a light guide plate 123 , and a PCB 129b on which the LED 129a and the LED 129a are mounted. ) and the optical sheets 121 are stacked on the light guide plate 123 to form the backlight unit ( 120 in FIG. 2 ).

In addition, the first and second substrates 112 and 114 and a liquid crystal panel 110 having a liquid crystal layer (not shown) interposed therebetween are positioned on the backlight unit ( 120 in FIG. 2 ), and the first and second Polarizing plates 119a and 119b for selectively transmitting only specific light are attached to the outer surfaces of the substrates 112 and 114, respectively.

The backlight unit (120 in FIG. 2 ) and the liquid crystal panel 110 are integrally modularized through the guide light 130 and the cover bottom 150 , and if you look at this in more detail, the lower surface 151 of the cover bottom 150 . The reflecting plate 125, the light guide plate 123, and the optical sheet 121 are sequentially positioned on the upper side, and the LED assembly 129 is positioned on one side of the light guide plate 123, and the LED assembly 129 is the LED (129a). The PCB 129b is seated on the LED assembly mounting portion 157 of the cover bottom 150 so that the PCB 129b faces the light incident surface of the provisional light guide plate 123 .

At this time, one surface of the PCB 129b on which the LED 129a is mounted is in close contact with the outer surface of the first curved surface 157a of the cover bottom 150 and is attached and fixed through the first adhesive member 160a.

And, the vertical part 131 of the guide light 130 is in close contact with the other surface of the PCB 129b of the LED assembly 129, and the horizontal part 133 covers the upper area of the LED assembly 129 and the light guide plate ( It extends to the upper region of the light incident surface of the light guide plate 123 and covers and covers the upper region of the light incident portion of the light guide plate 123 .

At this time, as the horizontal portion 133 of the guide light 130 extends to a portion of the upper region of the light incident portion of the light guide plate 123 and is covered, by the horizontal portion 133 of the guide light 130 made of a thin sheet material In order to prevent damage to the light guide plate 123 , a protection member 170 may be positioned between the upper region of the light incident portion of the light guide plate 123 and the horizontal portion 133 of the guide light 130 .

The protective member 170 may be formed of at least one of a foam pad, an elastic resin, and an optical clear adhesive (OCA, optical clear resin; OCR).

And the liquid crystal panel 110 is supported by a part of the rear edge of the horizontal portion 133 of the guide light 130 and the upper surface 155 of the cover bottom 150, and a second adhesive member 160b having adhesiveness is applied thereto. The back edge is attached and fixed through the

Both the first and second adhesive members 160a and 160b may be formed of elastic resin, but the present invention is not limited thereto, and thus a foam pad and an optical clear adhesive (OCA) may be used. ) or double-sided tape may be provided.

In this way, the integrally modularized liquid crystal display 100 is connected to the pedestal 180 to form a finished product of the liquid crystal display 100 in a state that a user can actually use.

The pedestal 180 has a long bar shape corresponding to the longitudinal direction of the liquid crystal display device 100 , and is provided with a guide groove 181 into which the liquid crystal display device 100 is inserted. ) is fixed by being inserted into one edge of the guide groove (181).

At this time, the liquid crystal display device 100 inserted into the guide groove 181 of the pedestal 180 is vertically erected by being inserted into the guide groove 181 at one edge where the LED assembly 129 is located.

That is, the liquid crystal display device 100 is vertically erected by being inserted into the guide groove 181 at one edge where the LED assembly 129 is positioned, so that the LED assembly 129 of the liquid crystal display device 100 is positioned. One edge is to form a support end 190 of the liquid crystal display device 100 is configured to stand vertically.

Here, in the liquid crystal display 100 of the present invention, the area and thickness of the PCB 129b are thick so that the high-temperature heat generated from the plurality of LEDs 129a of the LED assembly 129 can be easily discharged to the outside. Therefore, the support end 190 of the liquid crystal display device 100 corresponding to the area and thickness of the PCB 129b is vertically erected in the guide groove 181 of the support 180 , and the liquid crystal display device 100 is more stable. is erected vertically and fixed.

At this time, the liquid crystal display device 100 inserted into the guide groove 181 of the pedestal 180 is such that the height H1 of the pedestal end 190 corresponds to the height H2 of the guide groove 181, so that the pedestal It is preferable that the support end 190 of the liquid crystal display device 100 inserted into the guide groove 181 of 180 is not exposed to the outside.

Through this, in the liquid crystal display device 100 of the present invention, only the area other than the support end 190 is exposed without the support end 190 being exposed to the outside of the support end 190 , A corresponding thin liquid crystal display device 100 is implemented.

In particular, as described above, in the thin liquid crystal display 100 according to the embodiment of the present invention, the reinforcing bar 200 is positioned on the rear surface of the cover bottom 150 to prevent thermal deformation of the cover bottom 150 from occurring. can Through this, it is possible to prevent the liquid crystal display device 100 from being bent or distorted, and light leakage due to the bending or distortion can also be prevented from occurring.

This reinforcing bar 200 is located directly above the support end 190 where the LED assembly 129 in which the thermal deformation of the cover bottom 150 is most severe is located, and this reinforcing bar 200 is the liquid crystal display device ( The liquid crystal display device has a long bar shape corresponding to the longitudinal direction of the liquid crystal display device 100 and a first reinforcing end 201 facing the rear surface of the liquid crystal display device 100 and vertically bent from the first reinforcing end 201 . (100) consists of a second reinforcing end 203 surrounding the outside of the support end (190).

At this time, a screw emboss 159 having a screw hole is protruded from the rear surface of the cover bottom 150 , and the first reinforcing end 201 of the reinforcing bar 200 has a screw guide hole corresponding to the screw emboss 159 . (205) is provided.

Accordingly, the cover bottom 150 and the reinforcing bar 200 are assembled and fastened to each other through the screw 210 that passes through the screw guide hole 205 and is screwed into the screw embossing 159 .

The head 210a of the screw 210 by the screw guide hole 205 is not exposed to the outside of the first reinforcing end 201 of the reinforcing bar 200, so that the cover bottom 150 serves as an outer cover. A separate external appearance operation on the rear surface of the liquid crystal display 100 according to the embodiment of the present invention may be omitted.

In addition, the end of the screw 210 does not protrude inside the lower surface 151 of the cover bottom 150 by the screw embossing 159, so that the backlight unit ( It is possible to prevent damage caused by the end of the screw 210 of 120 of FIG. 2 .

In addition, the reinforcing bar 200 is formed such that the second reinforcing end 203 surrounds the outside of the receiving end 190 of the liquid crystal display device 100 , and thus the liquid crystal display device 100 is formed by the second reinforcing end 203 . While protecting the support end 190 of the, the rigidity of the support end 190 is further improved.

That is, as the liquid crystal display device 100 is vertically erected and fixed to the guide groove 181 of the pedestal 180, the load of the liquid crystal display 100 is concentrated on the pedestal end 190. At this time, the reinforcing bar ( Since the second reinforcing end 203 of the 200 is located at the lowermost end of the liquid crystal display 100 that is substantially erected and fixed to the pedestal 180 , the rigidity of the pedestal 190 is improved. Through this, the liquid crystal display device 100, which is vertically erected in the guide groove 181 of the pedestal 180, is more stably vertically erected and fixed.

In particular, the reinforcing bar 200 according to the embodiment of the present invention applies a constant tensile stress to both short sides perpendicular to the longitudinal direction of the liquid crystal display device 100 by the elastic deformation force. Through this, it is possible to more reliably prevent the occurrence of warping or distortion of the liquid crystal display device 100 . This will be described in more detail with reference to FIGS. 4A and 4B .

4A is a schematic diagram schematically showing the appearance of a liquid crystal display device and a reinforcing bar, and FIGS. 4B to 4C are schematic diagrams schematically illustrating a state in which a tensile stress is applied to the liquid crystal display device by the reinforcing bar.

And, Figure 5 is a graph showing the experimental results of measuring the warpage of the liquid crystal display according to the embodiment of the present invention.

As shown in FIG. 4A , the reinforcing bar 200 is positioned on the rear surface of the liquid crystal display 100 according to the embodiment of the present invention, and the reinforcing bar 200 corresponds to the longitudinal direction of the liquid crystal display 100 . It is made in the shape of a long bar, and is mounted on the rear surface of the liquid crystal display device 100 in a convexly bent state toward the rear surface of the liquid crystal display device 100 .

At this time, the reinforcing bar 200 in a convexly bent state toward the rear surface of the liquid crystal display device 100 is flattened in the process of being mounted to the rear surface of the liquid crystal display device 100 , and thus, as shown in FIG. 4B , As such, a tensile stress is applied to both ends perpendicular to the longitudinal direction of the liquid crystal display device 100 due to a force to return to the original shape of the reinforcing bar 200, so that the liquid crystal display device 100 has both ends perpendicular to the longitudinal direction. The reinforcing bar 200 is bent to the rear side, and the liquid crystal display 100 is also convexly bent toward the front.

At this time, when the liquid crystal display device 100 is driven, the cover bottom is caused by thermal deformation generated in the process of driving the liquid crystal panel ( 110 in FIG. 3 ) and the backlight unit ( 120 in FIG. 2 ) of the liquid crystal display device 100 . In the liquid crystal display device 100 including ( 150 in FIG. 3 ), both ends perpendicular to the longitudinal direction are bent toward the front, and compressive stress is generated.

Therefore, as shown in FIG. 4C , the compressive stress of the liquid crystal display 100 and the tensile stress of the reinforcing bar 200 cancel each other, so that the liquid crystal display 100 and the reinforcing bar 200 are constrained to each other and are flat status will be maintained.

Accordingly, it is possible to prevent bending or distortion of the light-weight and thin liquid crystal display 100 , thereby preventing light leakage or damage to internal elements.

In particular, the reinforcing bar 200 of the present invention is outside the first reinforcing end (201 in FIG. 3 ) positioned toward the rear surface of the liquid crystal display device 100 and the receiving end (190 in FIG. 3 ) of the liquid crystal display device 100 . As the second reinforcing end (203 in FIG. 3) is included to surround It can be offset, so that bending or distortion of the liquid crystal display device 100 can be further prevented.

5 is an experimental result graph of measuring the amount of warpage of the liquid crystal display device 100 according to the presence or absence of the reinforcement bar 200 according to an embodiment of the present invention,

Sample 1 shows the liquid crystal display device not provided with the reinforcement bar 200 according to the embodiment of the present invention, and Sample 2 shows the liquid crystal display device 100 equipped with the reinforcement bar 200 according to the embodiment of the present invention. indicates.

And, the amount of deflection is one edge of the liquid crystal display device 100 on which the upper surface (155 of FIG. 3 ) of the cover bottom (150 of FIG. 3 ) opposite to the support end (190 of FIG. 3 ) of the liquid crystal display device 100 is located. After placing the rubber band on the , it was measured through the amount of deformation of the rubber band.

At this time, a value within the range of 0 to -3.5 means that the amount of warpage is very insignificant, so that no warpage has actually occurred.

5, in the liquid crystal display device not provided with the reinforcement bar 200 according to the embodiment of the present invention, warpage of -7.0 (=Δ7mm) or more occurs after driving, but according to the embodiment of the present invention, It can be seen that the liquid crystal display device 100 including the reinforcing bar 200 has a warpage of -2.0 (=Δ2mm) or less.

Here, a value of -2.0 means that no bending occurs, and thus the liquid crystal display 100 including the reinforcing bar 200 according to the embodiment of the present invention does not substantially occur.

As described above, the liquid crystal display 100 according to the embodiment of the present invention includes a liquid crystal panel (110 in FIG. 3) and a backlight unit (120 in FIG. 2), a guide light (130 in FIG. 3) and a cover bottom (FIG. By modularizing only through 150 of 3), and allowing the cover bottom (150 in FIG. 3) to serve as an outer cover, light weight and thinness of the liquid crystal display 100 is possible, and the process is simplified. In addition, the process cost can be reduced.

In addition, even though the liquid crystal display device 100 is lightweight and thin, by further providing the reinforcing bar 200 on the back surface of the cover bottom (150 in FIG. 3 ), bending or distortion of the liquid crystal display device 100 occurs This can also prevent light leakage or damage to internal components.

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

100: liquid crystal display device
110: liquid crystal panel (112, 114: first and second substrates)
119a, 119b: polarizing plate
121: optical sheet, 123: light guide plate, 125: reflector
129: LED assembly (129a: LED, 129b: PCB)
130: guide light (131: vertical part, 133: horizontal part)
150: cover bottom (151: lower surface, 155: upper surface, 157: LED assembly seating part (157a: first curved surface, 157b: second curved surface), 159: screw emboss)
160a, 160b: first and second adhesive members
170: protection member
180: pedestal (181: guide groove)
190: support end
200: reinforcing bar (201: first reinforcing end, 203: second reinforcing end, 205: screw guide hole)
210: screw (210a: head)

Claims (12)

a backlight unit including an LED assembly including a plurality of LEDs and a PCB, a light guide plate facing the plurality of LEDs with a light incident surface, an optical sheet positioned above the light guide plate, and a reflector positioned below the light guide plate;
a liquid crystal panel positioned above the backlight unit;
a cover bottom provided with a lower surface on which the backlight unit is seated, and an LED assembly seating part on which the LED assembly is positioned on one edge;
Adjacent to the LED assembly seating portion, a reinforcement bar mounted to the rear surface of the cover bottom
includes,
The reinforcing bar has a bar shape corresponding to the longitudinal direction of the cover bottom,
a first reinforcing end opposite to the rear surface of the cover bottom;
and a second reinforcing end that is vertically bent from the first reinforcing end and surrounds the outside of the LED assembly seating portion,
The LED assembly seating portion includes a first curved surface bent downward from the lower surface of the cover bottom,
The upper surface of the PCB on which the plurality of LEDs are mounted is in close contact with the first curved surface.
The method of claim 1,
A portion of the rear surface of the reinforcing bar and the cover bottom is an outermost structure of the entire rear surface of the liquid crystal display device.
The method of claim 1,
A screw embossing is provided on a rear surface of the cover butum, and a screw guide hole is provided at the first reinforcing end corresponding to the screw embossing.
The method of claim 1,
The reinforcing bar is assembled and fastened to the cover bottom in a convexly bent state toward the rear surface of the cover bottom, and a tensile stress is applied to both ends perpendicular to the longitudinal direction of the liquid crystal display device.
The method of claim 1,
The LED assembly seating portion further includes a second curved surface that is vertically bent outwardly so as not to face the lower surface of the cover bottom from the first curved surface,
A side surface of the PCB connected to the upper surface of the PCB is in close contact with the second curved surface.
6. The method of claim 5,
The upper surface of the PCB is attached to the first curved surface through a first adhesive member.
The method of claim 1,
A liquid crystal display device provided with a guide light to the outside of the LED assembly seated on the LED assembly seating portion.
8. The method of claim 7,
The guide light includes a vertical portion in close contact with a rear surface of the PCB opposite to the upper surface of the PCB, and a horizontal portion vertically bent from the vertical portion to cover an upper region of the LED assembly.
9. The method of claim 8,
The horizontal portion extends to an upper region of the light incident surface of the light guide plate, and a protective member is provided between the horizontal portion and the upper region of the light incident surface of the light guide plate.
8. The method of claim 7,
The other edge of the cover bottom includes a side surface vertically bent upward from the lower surface, and an upper surface vertically bent to face the lower surface from the side surface,
The liquid crystal panel has a rear edge supported by a horizontal portion of the guide light and an upper portion of the upper surface of the liquid crystal panel, and is attached to the liquid crystal panel through a second adhesive member.
The method of claim 1,
One edge at which the LED assembly mounting part is provided forms a support end of the liquid crystal display device, and is inserted into a guide groove of the base, so that the liquid crystal display device is vertically erected and fixed. The method of claim 1,
The plurality of LEDs are mounted on one side of the upper surface of the PCB to correspond to the light guide plate,
The upper surface of the PCB exposed to the outside of the plurality of LEDs is disposed to extend below the lower surface of the cover bottom.

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