KR20130026220A - Liquid crystal display device - Google Patents

Abstract

PURPOSE: A liquid crystal display device is provided to stably fix a light guide plate to a cover bottom by using a fixing member. CONSTITUTION: A light guide plate(123) includes a plurality of combination grooves(210). A plurality of fixing members(320) include a contact unit(323) and a body unit(325). The contact unit has a first length corresponding to the width of each combination groove. The contact unit is in contact with each combination groove. The body unit has a second length shorter than the first length. The body unit is inserted into the each combination groove.

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 liquid crystal display device capable of more stably preventing the light guide plate from flowing and preventing light leakage from occurring.

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 is an essential component of a liquid crystal panel bonded through a liquid crystal layer between two side-by-side substrates, and realizes a difference in transmittance by changing an 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 its own light emitting element, a separate light source is required in order to display the difference in transmittance as an image. To this end, a backlight unit in which a light source is embedded is disposed on the back of the liquid crystal panel.

The backlight unit includes a light source and is classified into a direct type and an edge type according to the position of the light source. The backlight unit of the direct type emits light from the light source by arranging the light source under the liquid crystal panel. It is a method of directly supplying the light to the liquid crystal panel, the backlight unit of the side-type method is disposed from the light source by using the refraction and reflection in the light guide plate by arranging the light guide plate under the liquid crystal panel, and by placing the light source on at least one side of the light guide plate Indirect light is supplied to the liquid crystal panel.

In this case, the side type backlight unit is easier to manufacture than the direct type backlight unit, and has a thin shape, light weight, and low power consumption.

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

As illustrated in FIG. 1, the liquid crystal display module 1 includes a liquid crystal panel 10 including the first and second substrates 12 and 14 and a backlight unit 20 positioned behind the liquid crystal panel 10. .

The liquid crystal panel 10 plays a key role in image expression, and is composed of first and second substrates 12 and 14 bonded to each other with a liquid crystal layer interposed therebetween.

First and second polarizing plates 19a and 19b for selectively transmitting only specific light are attached to the outer surfaces of the first and second substrates 12 and 14, respectively.

The backlight unit 20 includes an LED assembly (not shown), a reflector 25 seated on the cover bottom 50, a light guide plate 23 positioned on the reflector 25, and an upper portion of the light guide plate 23. It includes a plurality of interposed optical sheets 21.

The liquid crystal panel 10 and the backlight unit 20 are modularized through the top cover 40, the support main 30, and the cover bottom 50. The edges of the liquid crystal panel 10 and the backlight unit 20 may be squared. In the state where the frame-shaped support main 30 is worn, the top cover 40 covering the front edge of the liquid crystal panel 10 and the cover bottom 50 covering the back of the backlight unit 20 are respectively coupled in front and rear to support main. 30 is integrated through the medium.

At this time, the plurality of fixing pins 80 are inserted in the direction toward the liquid crystal panel 10 through the plurality of through holes formed in the cover bottom 50 to prevent the light guide plate 23 from flowing. ) Is positioned at the edge of the liquid crystal display module and in the non-display area.

On the other hand, the liquid crystal display device has recently been increasingly used, such as portable computers, desktop computer monitors and wall-mounted televisions, and has a wider display area and a narrower bezel width. Is actively underway.

As the bezel of the liquid crystal display becomes narrower as described above, the plurality of fixing pins 80 are located closer to the display area, which increases the light leakage phenomenon in which light emitted from the light guide plate 23 leaks to the outside, thereby degrading image quality. There is a problem.

In addition, as a plurality of fixing pins 80 are located in the non-display area, there is a problem in that a limit is generated in reducing the width of the bezel.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a liquid crystal display device which can more stably fix the light guide plate and prevent light leakage.

According to an aspect of the present invention, there is provided a liquid crystal display device comprising: a light guide plate including a plurality of coupling grooves formed along both edges facing each other, having a depth and a width; An LED assembly arranged at at least one edge adjacent to both edges; A plurality of optical sheets seated on the light guide plate; A liquid crystal panel seated on the plurality of optical sheets; Inserted into and coupled to each of the coupling grooves, including a contact portion having a first length corresponding to the width of each of the coupling grooves, the contact portion in contact with each of the coupling grooves, and a body portion connected thereto and having a second length smaller than the first length. It includes a plurality of fixing members.

Each corner of the contact portion is characterized in that the rounded.

Each of the coupling grooves includes a first surface facing each other and a third surface connecting the first and second inner surfaces, and the contact portion of each fixing member has a third length smaller than the depth of the coupling groove. And two contacting surfaces in contact with the third surface of each of the coupling grooves, and two connecting surfaces adjacent to the contacting surfaces and partially contacting the first and second inner surfaces.

The body portion is characterized in that a through hole penetrating from the front to the back.

Each of the fixing members is formed to have a length longer than the depth of each of the coupling grooves, characterized in that protruding from the coupling grooves.

It further includes a cover bottom disposed on the rear surface of the light guide plate and having two side surfaces which are vertically bent from the horizontal surface and its edges, one surface of each of the protruding fixing member is in contact with the inner surface of the corresponding cover bottom It is characterized by.

A reflection plate may be further provided between the horizontal surface of the cover bottom and the light guide plate.

As described above, according to the present invention, by applying a fixing member which can more securely fix the light guide plate to the cover bottom while reducing the contact area with the light guide plate, the light guide plate can be more stably fixed to the cover bottom to prevent light leakage. It becomes possible.

In particular, it is possible to prevent the light guide plate from being damaged through the fixing member while preventing the flow of the light guide plate when an external impact or shaking is applied.

Accordingly, it is possible to implement a more reliable liquid crystal display device by increasing the luminance by protecting the light guide plate and the light source from the external impact and preventing light leakage.

1 is a cross-sectional view of a conventional liquid crystal display module.
2 is an exploded perspective view schematically illustrating a liquid crystal display module according to an exemplary embodiment of the present invention.
3 is a perspective view schematically illustrating a light guide plate fixed to a cover bottom through a first fixing member according to a preferred embodiment of the present invention.
4 is an enlarged cross-sectional view illustrating a state in which a first fixing member is inserted into a light guide plate according to a preferred embodiment of the present invention.
5 is a view showing the operation of the first fixing member according to the present invention when an external impact is applied.
6 is a perspective view schematically illustrating a light guide plate fixed to a cover bottom through a second fixing member according to a preferred embodiment of the present invention.
7 is an enlarged cross-sectional view illustrating a state in which a first fixing member is inserted into a light guide plate according to a preferred embodiment of the present invention.
8 is a view showing a result of applying a shock to the light guide plate according to an embodiment of the present invention.

Hereinafter, embodiments 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 module according to an exemplary embodiment of the present invention.

As shown in FIG. 2, the liquid crystal display device module 100 includes a liquid crystal panel 110, a backlight unit 120, and a support main 130 for modularizing the liquid crystal panel 110 and the backlight unit 120. ) And the cover bottom 150, the top cover 140.

The liquid crystal panel 110 plays a key role in image expression, and is composed of first and second substrates 112 and 114 bonded to each other with a liquid crystal layer interposed therebetween.

Although not shown in the drawings, a plurality of gate lines and data lines intersect on the inner surface of the first substrate 112, which is commonly referred to as a lower substrate or an array substrate, under the premise of an active matrix scheme, and pixels are defined at each intersection. A thin film transistor (TFT) is provided to correspond one-to-one with a transparent pixel electrode formed in each pixel.

In addition, the inner surface of the second substrate 114 called the upper substrate or the color substrate may correspond to each pixel, for example, a color filter of red (R), green (G), and blue (B) color and each of them. A black matrix covering the non-display elements such as gate lines, data lines, and thin film transistors is provided.

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

In addition, the printed circuit board 117 is connected through 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 support main 130 side or cover cover 150 may be properly folded to be in close contact with the back.

Accordingly, the liquid crystal panel 110 having the above-described structure may be configured to have a data driving circuit when the thin film transistor selected for each gate line is turned on by an on or off signal of a gate driver circuit transmitted through the printed circuit board 117. The signal voltage is transmitted to the corresponding pixel electrode through the data line, and the arrangement direction of the liquid crystal molecules is changed by the electric field between the pixel electrode and the common electrode, thereby indicating a difference in transmittance.

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

The backlight unit 120 includes a light source arranged along an edge of the support main 130, a reflector 125, a light guide plate 123 seated on the reflector 125, and a plurality of optical sheets interposed thereon. (121).

As a light source, an LED 129a is used. Each of the plurality of LEDs 129a is spaced at a predetermined interval and mounted on a printed circuit board (PCB) 129b to form an LED assembly 129.

Although not shown in the drawings, a fluorescent lamp may be used instead of the LED assembly 129, and when the fluorescent lamp is used, a lamp guide for protecting and guiding the outside of the fluorescent lamp and concentrating light toward the light guide plate 123 may be further included. Can be.

The LED assembly 129 is fixed by a method such as adhesion so that light emitted from the plurality of LEDs 129a faces the light incident part of the light guide plate 123.

The LED assembly 129 may be arranged on one side of the light guide plate 123 as shown in the drawing, but is not limited thereto and may be arranged on both side surfaces of the light guide plate 123 facing each other.

In this case, the LED assembly 129 is controlled by an LED driver integrated circuit (IC) (not shown) to emit light.

Under the control of the LED driver integrated circuit (not shown), the light emitted from the plurality of LEDs 129a of the LED assembly 129 is indirectly applied to the liquid crystal panel 110 by using the refraction and reflection of the light guide plate 123. Will be supplied.

Meanwhile, a heat sink (not shown) may be provided to more efficiently discharge heat generated from each of the plurality of LEDs 129a of the LED assembly 129. The heat sink (not shown) may be a metal material having excellent thermal conductivity. It may be made of a straight or bent B-shaped to surround the back of the printed circuit board 129b or one side of the plurality of LEDs (129a) is located on the back of the printed circuit board (129b).

The reflection plate 125 is positioned on the rear surface of the light guide plate 123 to reflect the light passing through the rear surface of the light guide plate 123 toward the liquid crystal panel 110 to improve the brightness of the light.

The light guide plate 123 evenly spreads the light incident from each of the plurality of LEDs 129a to a wide area of the light guide plate 123 while propagating through the light guide plate 123 by a plurality of total reflections to provide a surface light source to the liquid crystal panel 110. Be sure to

Here, the light guide plate 123 is characterized in that a plurality of coupling grooves 210 for inserting each of the plurality of fixing members 220 for fixing the light guide plate 123 on both sides thereof facing each other. .

The plurality of coupling grooves 210 may allow the light guide plate 123 to be fixed to the cover bottom 150 through the plurality of fixing members 220 to fix the position of the light guide plate 123 in the liquid crystal display module 100. To help.

Each of the plurality of fixing members 220 is made of a mold, and unlike the fixing pin (80 of FIG. 1) inserted adjacent to the conventional display area, the fixing members 220 are positioned at the edge of the light guide plate 123 to prevent light leakage. It becomes possible.

That is, as the bezel of the liquid crystal display device becomes smaller, the conventional fixing pin (80 in FIG. 1) is located in the non-display area adjacent to the display area, causing light leakage, but the fixing member 220 according to the present invention is It is located at the edge of the display area and away from the display area, thereby preventing light leakage.

Therefore, the plurality of coupling grooves 210 formed in the light guide plate 123 and the plurality of fixing members 220 coupled thereto protect the light guide plate 123 from being moved by an external impact or shaking to protect the light guide plate 123. In addition, the plurality of LEDs 129a of the LED assembly 129 positioned on at least one side of the light guide plate 123 may be prevented from being damaged by the flow of the light guide plate 123.

On the other hand, the light guide plate 123 as described above may include a pattern of a specific shape on the back to supply a uniform surface light source. The pattern may be configured in various ways, such as an elliptical pattern, a polygon pattern, a hologram pattern, and the like to guide the light incident to the light guide plate 123. The lower surface of the 123 may be formed by a printing method or an injection method.

In addition, the light guide plate 123 may include polymethylmethacrylate (PMMA) or polymethyl methacrylate (PMMA) and polystyrene (PS), which are acrylic transparent resins, which are one of transparent materials capable of transmitting light. It may be made of a mixed polymethacrylstyrene (MS) resin.

A plurality of optical sheets 121 are interposed on the light guide plate 123, and the plurality of optical sheets 121 may include a diffusion sheet, at least one prism sheet, and a protective sheet.

Accordingly, the plurality of optical sheets 121 diffuses or condenses the light passing through the light guide plate 123 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 described above are modularized through the top cover 140, the support main 130, and the cover bottom 150.

The top cover 140 has a rectangular frame having a cross section bent in a-shape so as to cover the front and side edges of the liquid crystal panel 110 so that an image implemented in the liquid crystal panel 110 can be displayed.

The cover bottom 150, on which the backlight unit 120 is seated and serves as the basis of the entire structure of the LCD device module 100, has a rectangular plate shape, and the horizontal surface 151 closely adheres to the rear surface of the backlight unit 120. And, its edge is composed of four sides 153 vertically bent upwards.

The support main 130 surrounds the edges of the liquid crystal panel 110 and the backlight unit 120 in a rectangular frame shape and is seated on the cover bottom 150.

Accordingly, the liquid crystal panel 110 and the backlight unit 120 have a top frame 140 covering the top edge of the liquid crystal panel 110 in a state where the edge is surrounded by the support main 130 having a rectangular frame shape, and the backlight unit 120. Cover cover 150 to cover the back of the) is respectively coupled to the front and rear is integrated through the support main 130 as a medium and modularized.

As it is modularized, the light emitted from each of the plurality of LEDs 129a of the backlight unit 120 is incident on the light incident part of the light guide plate 123, and then refracted toward the liquid crystal panel 110 therein, and the reflecting plate While passing through the plurality of optical sheets 121 together with the light reflected by the 125 is processed into a more uniform high-quality surface light source is supplied to the liquid crystal panel 110.

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

Hereinafter, the fixing member inserted into the light guide plate according to the present invention will be described in more detail with reference to the drawings.

3 is a perspective view schematically illustrating a light guide plate fixed to a cover bottom through a first fixing member according to a preferred embodiment of the present invention, and FIG. 4 is a light guide plate of the first fixing member according to a preferred embodiment of the present invention. 2 is an enlarged cross-sectional view of a state inserted into the container.

As illustrated in FIG. 3, the light guide plate 123 may include an upper surface 123a for supplying light to the liquid crystal panel 110 (in FIG. 2), a lower surface 123b opposite thereto, and an upper surface 123a and a lower surface ( It consists of four sides 123c connecting 123b).

The light guide plate 123 includes a plurality of first fixing members 220 to be inserted and coupled along a light incident surface, which is an edge side surface 123c on which an LED assembly (129 of FIG. 2) is disposed, and both edge side surfaces 123c adjacent thereto. The coupling groove 210 is provided.

Each of the coupling grooves 210 includes first and second inner surfaces 210a and 210b facing each other and a third inner surface 210c connecting the surfaces, and the first and second inner surfaces 210a and 210b. The length of the corresponding to the depth (d) of the coupling groove 210, the length of the third inner surface (210c) corresponds to the width (w) of the coupling groove (210).

Each of the plurality of first fixing members 220 is inserted into each of the plurality of coupling grooves 210, and each of the first fixing members 220 has a quadrangular shape corresponding to each of the coupling grooves 210.

The first fixing member 220 is formed to correspond to the shape, position and number of the coupling groove 210, but is shown in the figure in a square shape, but is not limited to this will be variously changed according to the shape of the coupling groove 210. Can be.

As shown in FIG. 4, the first fixing member 220 has a first length substantially equal to the width w of the coupling groove 210 in a first direction corresponding to the width w of the coupling groove 210. (L1) has a second length (L5) perpendicular to the first direction and longer than the depth of the coupling groove 210 in the second direction corresponding to the depth (d) of the coupling groove (210).

Here, the second length L2 is formed to have a length that allows the first fixing member 220 to fill a space between the light guide plate 123 and the cover bottom 150 on which the light guide plate 123 is seated.

Accordingly, when each of the plurality of first fixing members 220 is inserted into each of the plurality of coupling grooves 210, the protruding surface 221 of the first fixing member 220 protruding from the coupling groove 210 is covered. In contact with the inner surface 153 of the 150, through which the light guide plate 123 can be fixed to the cover bottom 150.

The first fixing member 220 is formed with a through hole 220a penetrating from the front side to the back side.

The through hole 220a may be fastened by inserting a coupling member (not shown) such as a screw or a hook through the first light guide plate 123 to the cover bottom 150 through the first fixing member 220. Make sure

Accordingly, as the first fixing member 220 is inserted into the coupling groove 210 of the light guide plate 123 seated on the cover bottom 150, the light guide plate 123 and the cover bottom through the first fixing member 220. As the space between the 150 is filled, the light guide plate 123 is first fixed to the cover bottom (150 of FIG. 2), and a coupling member (not shown) such as a screw or a hook penetrates through the first fixing member 220. By inserting and fastening to the hole 220a, the light guide plate 123 is securely fixed to the cover bottom 150 in the second order.

Although not shown, the thickness of the first fixing member 220 may be the same as the thickness of the light guide plate 123 in which the plurality of coupling grooves 210 are formed, or may be formed thicker than the thickness of the light guide plate 123.

As described above, by fixing the light guide plate 123 to the cover bottom 150 through the first fixing member 220, it is possible to prevent light leakage unlike the prior art. When the external shock is applied, the first fixing member 220 is applied. ), There is a problem that the light guide plate 123 is cracked or the light guide plate 123 is broken.

5 is a view showing the operation of the first fixing member according to the present invention when an external impact is applied, see FIGS. 3 and 4.

As shown in FIG. 5, when an impact is applied to the light guide plate 123 to move the light guide plate 123 in the x-axis direction, one edge of the coupling groove 210 of the light guide plate 123 is moved by the first fixing member 220. Cracks can be applied to the sides.

That is, when an impact is applied, the load is applied to the end of the second inner surface 210b of the coupling groove 210 by the first fixing member 220 which is in total contact with the coupling groove 210 of the light guide plate 123, that is, the light guide plate ( Concentrated on the side connected to the side (123c) of the 123 while the force acts in the x-axis direction will cause cracks in the coupling groove (210).

Hereinafter, a second fixing member that can solve the problem according to the first fixing member will be described with reference to the drawings.

6 is a perspective view schematically illustrating a light guide plate fixed to a cover bottom through a second fixing member according to a preferred embodiment of the present invention, and FIG. 7 is a light guide plate of the first fixing member according to a preferred embodiment of the present invention. A cross-sectional view showing an enlarged view of the inserted state. Here, except for the second fixing member, since it has the same structure as that of the liquid crystal display module of FIG. 2, the same reference numeral is assigned to the same configuration, and the description of the same configuration is omitted.

As illustrated in FIG. 6, the light guide plate 123 may include an upper surface 123a for supplying light to the liquid crystal panel 110 (in FIG. 2), a lower surface 123b opposite thereto, and an upper surface 123a and a lower surface ( It consists of four sides 123c connecting 123b).

The light guide plate 123 includes a plurality of second fixing members 320 to be inserted and coupled along the light incident surface, which is an edge side surface 123c on which the LED assembly (129 of FIG. 2) is disposed, and both edge side surfaces 123c adjacent thereto. The coupling groove 210 is provided.

Each of the coupling grooves 210 includes first and second inner surfaces 210a and 210b facing each other and a third inner surface 210c connecting the surfaces, and the first and second inner surfaces 210a and 210b. The length of the corresponding to the depth (d) of the coupling groove 210, the length of the third inner surface (210c) corresponds to the width (w) of the coupling groove (210).

The second fixing member 320 inserted into and coupled to the coupling groove includes a contact portion 323 and a body portion 325 connected thereto and is provided corresponding to the position and number of the coupling grooves 210.

The contact part 323 is a part directly contacting the coupling groove 210 of the light guide plate 123, and the outer surface (outer surface) of the contact part 323 and the inner surface (inner surface) of the coupling groove 210 are in contact with each other so that the light guide plate ( The 123 is fixed to prevent flow, and the light guide plate 123 is protected from an external impact.

The contact portion 323 has a first length L1 substantially equal to the width w of the coupling groove 210 in a first direction corresponding to the width w of the coupling groove 210, and is perpendicular to the first direction. And is formed to have a second length L2 smaller than the depth of the coupling groove 210 in the second direction corresponding to the depth d of the coupling groove 210.

Looking at the cross section of the contact portion 323 with reference to Figure 7, the first contact surface 323a corresponding to the third inner surface (210c) of the coupling groove 210, the first side facing the body portion 325 connected to this; It consists of two contact surfaces 323b and two connection surfaces 323c connecting the first and second contact surfaces 323a and 323b.

Accordingly, two connection surfaces 323c corresponding to the first contact surface 323a of the contact portion 323 and neighboring the first contact surface 323a and the first and second inner surfaces 210a and 210b of the coupling groove 320 are formed in the coupling groove 210. Contact is made along the inner surface.

At this time, the corners of each of the first contact surface 3223a and the two connection surfaces 323c adjacent to each other at right angles are rounded to be generated by contacting the corners of the coupling groove 210 and the corners of the contact portions 323 corresponding thereto. It can prevent the shock.

The body part 325 has a third length L3 smaller than the width w of the coupling groove 210 in the first direction corresponding to the width w of the coupling groove 210, and is perpendicular to the first direction. It is formed to have a fourth length (L4) in the second direction corresponding to the depth (d) of the coupling groove (210).

Here, the fourth length (L4) is preferably formed longer than the second length (L2), the total length (L5) of the sum of the second length (L2) and the fourth length (L4) is the depth of the coupling groove 210. It is formed to a length formed longer than (d).

Accordingly, the third contact surface 325a facing the first contact surface 323a of the contact portion 323 in the body portion 325 is in contact with the inner surface 153 of the cover bottom 150, the third contact surface 325a Body portion 325, except) is characterized in that it is formed so as not to contact the coupling groove 210 of the light guide plate (123).

The body portion 325 is formed with a through hole 320a penetrating from the front to the back.

The light guide plate 123 may be fixed to the cover bottom 150 through the second fixing member 320 by being coupled to the through hole 320a through a coupling member (not shown) such as a screw or a hook. Make sure

The second fixing member 320 including the contact portion 323 and the body portion 325 is inserted into and coupled to the coupling groove 210 of the light guide plate 123 to fix the light guide plate 123.

At this time, the total length (L5) of the second fixing member 320 is formed to be larger than the depth (d) of the coupling groove 210 to protrude from the coupling groove 210, as such protrudes from the coupling groove 210 As the protruding surface (the third contact surface 325a of the body part) of the second fixing member 320 contacts the inner surface of the cover bottom 150, the light guide plate 123 may be fixed to the cover bottom 150.

As such, as the second fixing member 320 is inserted into the coupling groove 210 of the light guide plate 123 seated on the cover bottom 150, the light guide plate 123 and the cover bottom are inserted through the second fixing member 320. As the space between the 150 is filled, the light guide plate 123 is first fixed to the cover bottom (150 in FIG. 2), and a coupling member (not shown) such as a screw or a hook penetrates through the second fixing member 320. The light guide plate 123 is reliably fixed to the cover bottom 150 by being inserted into and fastened to the hole 320a.

In particular, only the contact portion 323 of the second fixing member 320 contacts the coupling groove 210 of the light guide plate 123 so that the load applied to the coupling groove 210 when an impact from the outside is applied to the coupling groove ( The light guide plate 120 may be protected from an external impact by moving to the inside of the 210.

8 is a view showing a result of applying an impact when each of the first fixing member and the second fixing member is inserted into the light guide plate according to the embodiment of the present invention, see FIGS. 2 to 7.

Referring to FIG. 8, in experiment 1, 50 N is applied to a first point that is a far end from a corner of the coupling groove 210 formed in the light guide plate 123, that is, a connection point connecting the coupling groove 210 and the light guide plate 123. When the load (load) is applied, the maximum principal stress applied to the first point is 34.4 Mpa, and when the load of 50 N is applied to the second point near the edge of the coupling groove 210 in Experiment 2, the maximum applied to the second point is applied. The main stress is 26.4 Mpa. At this time, the load area A1 of the first point and the load area A2 of the second point are the same.

As a result of this experiment, the maximum principal stress applied to the second point of the coupling groove 210 is reduced by 24% than the maximum principal stress applied to the first point, and the maximum principal stress is applied as the load is applied to the inner edge of the coupling groove 210. It can be seen that this decrease.

That is, when the first fixing member (220 of FIG. 3) according to the present invention is applied, the first load acts on the first point of the coupling groove 210 according to the impact, thereby causing damage to the light guide plate 123. When the second fixing member (320 of FIG. 3) according to the present invention is applied, a second load smaller than the first load according to the impact is at the second point of the coupling groove 210, that is, the inner edge side of the coupling groove 210. By being caught, the load can be minimized to protect the light guide plate 123 from impact.

The embodiments of the present invention as described above are merely illustrative, and those skilled in the art can make modifications without departing from the gist of the present invention. Accordingly, the protection scope of the present invention includes modifications of the present invention within the scope of the appended claims and equivalents thereof.

123: light guide plate
210: coupling groove 220a: first inner surface, 220b: second inner surface, 220c: third inner surface)
320: second fixing member 320a: through hole
323: contact portion (323a: first contact surface, 323b: second contact surface, 323c: connection surface)
325: body portion (325a: third contact surface)

Claims (7)

A light guide plate having a predetermined depth and width and including a plurality of coupling grooves formed along both edges facing each other;
An LED assembly arranged at at least one edge adjacent to both edges;
A plurality of optical sheets seated on the light guide plate;
A liquid crystal panel seated on the plurality of optical sheets;
Inserted into and coupled to each of the coupling grooves, including a contact portion having a first length corresponding to the width of each of the coupling grooves, the contact portion in contact with each of the coupling grooves, and a body portion connected thereto and having a second length smaller than the first length. Liquid crystal display comprising a plurality of fixing members.
The method of claim 1,
And each corner of the contact portion is rounded.
The method of claim 1,
Each coupling groove is
A first surface facing each other and a third surface connecting the first and second inner surfaces,
The contact portion of each fixing member
A liquid crystal display having a third length smaller than the depth of the coupling groove, the contact surface in contact with the third surface of each coupling groove and two connection surfaces adjacent to the contact surface and partially contacting the first and second inner surfaces. Device.
The method of claim 1,
The body
A liquid crystal display device having a through hole penetrating from the front side to the back side.
The method of claim 1,
And each fixing member is formed to have a length longer than the depth of each of the coupling grooves so as to protrude from the coupling grooves.
6. The method of claim 5,
It further comprises a cover bottom disposed on the rear surface of the light guide plate having a horizontal surface and two vertical sides bent from the edge thereof and facing each other,
One surface of each of the protruding fixing members may be in contact with an inner surface of the cover bottom corresponding thereto.
The method according to claim 6,
And a reflective plate between the horizontal surface of the cover bottom and the light guide plate.

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