KR102468620B1 - Liquid crystal display device - Google Patents

Abstract

According to the present invention, a protruding piece is formed on an optical film member of a backlight unit, such as a light guide plate and an optical sheet, and a structure positioned outside the backlight unit includes a sidewall composed of a first sidewall portion of the bottom cover and a second sidewall portion of the guide panel. An insertion hole and an insertion groove are formed in the structure to form a fastening structure in which the protruding piece is inserted into the insertion hole and the insertion groove, and a reinforcing pattern is provided in the area where the insertion hole is formed and a second width is provided in the area where the insertion groove is formed. It is provided with a light-shielding pattern of.
Accordingly, the width of the guide panel can be minimized, so that a narrow bezel of the liquid crystal display can be effectively implemented, and dark parts and light leakage in the insertion hole and the insertion groove can be improved.

Description

Liquid crystal display device {Liquid crystal display device}

The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device with improved luminance and image quality while implementing a narrow bezel.

As the information society develops, the demand for display devices for displaying images is increasing in various forms, and recently, liquid crystal display devices (LCDs), plasma display devices (PDPs), organic Various flat display devices such as organic light emitting diodes (OLEDs) are being utilized.

Among these flat panel display devices, liquid crystal display devices are widely used because of their advantages of miniaturization, light weight, thinness, and low power consumption.

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

Referring to FIG. 1, a conventional liquid crystal display device 10 includes a liquid crystal panel (not shown), a backlight unit 40, a guide panel 50, which is a mechanism supporting the liquid crystal panel and the backlight unit 40, and a bottom. A cover 60 may be included.

The backlight unit 40 is configured to be accommodated inside the bottom cover 60, which includes a reflector 45 placed on the bottom surface of the bottom cover 60 and a light guide plate (LGP) on the reflector 45 ( 43), an optical sheet 41 on the light guide plate 43, and a light emitting diode (LED) disposed on one side of the light guide plate 43 as a light source.

The guide panel 50 is configured to cover the upper edge of the optical sheet 41 , and a liquid crystal panel may be seated on the upper surface of the guide panel 50 .

In the conventional liquid crystal display device 10 configured as described above, there is a limit to reducing the width of the guide panel 50 in consideration of thermal expansion or separation prevention of the optical sheet 41 and the light guide plate 43.

In this regard, in consideration of thermal expansion of the optical sheet 41 and the light guide plate 43, the optical sheet 41 and the light guide plate 43 should be spaced apart from the inner surface of the bottom cover 60 adjacent thereto by a predetermined distance. In addition, when the overlapping width between the guide panel 50, the optical sheet 41, and the light guide plate 43 is small, the optical sheet 41 and the light guide plate 43 can come out of the guide panel 50 and be separated. , The guide panel 50 should be configured to overlap the optical sheet 41 and the light guide plate 43 by a certain width or more.

Accordingly, there is a limit to reducing the width of the guide panel 41, and also, due to problems such as occurrence of dark parts and light leakage due to the decrease in the width of the bezel, the edge of the liquid crystal display device 10 is not displayed. There is a limit to reducing the width of a bezel, which is an area.

The present invention is to solve the above problems, and to improve the luminance and image quality of a liquid crystal display by implementing a narrow bezel, preventing the movement of a light guide plate and an optical sheet, and at the same time improving light leakage and dark areas. The purpose.

In order to achieve the above object, the present invention provides a bottom cover having a base portion and a first sidewall portion, a light guide plate on the base portion, an optical sheet on the light guide plate, a seating portion on the optical sheet, and a guide having a second sidewall portion. A first protruding piece provided on a first side surface of the liquid crystal panel and the light guide plate on the panel and the mounting portion and a second protruding piece provided on the first side surface of the optical sheet and located outside the optical sheet and the light guide plate, A side wall structural part composed of 1 and 2 side wall parts and having an insertion hole into which at least a second protruding piece of the first and second protruding pieces is inserted, a reinforcing pattern provided on a lower surface of the first protruding piece, and the first protruding piece of the optical sheet. Provided is a liquid crystal display device including a light-shielding pattern connected to correspond to one side.

Here, the side wall structure further includes an insertion groove, a third protrusion spaced apart from the second protrusion piece is provided on a first side surface of the optical sheet, and the first and second protrusion pieces are inserted together into the insertion hole. , The third protruding piece is inserted into the insertion groove, the light-shielding pattern has a first width and a second width, the second width is disposed on the first side surface corresponding to the third protruding piece, The second width may be narrower than the first width.

In addition, the insertion hole is composed of a first concave inlet provided on the first side wall portion and a second concave inlet provided on the second side wall portion, and the insertion groove is a third concave inlet provided on the first side wall portion. And it may be made of the second side wall portion covering the third concave inlet.

Here, it may further include a reflector positioned between the base portion and the light guide plate and provided with a fourth protruding piece corresponding to the lower part of the first protruding piece.

The first protruding piece may be provided on each of the first side surface and the second side surface opposite to the first side of the light guide plate, and the second protruding piece may be provided on each of the first side surface and the second side surface opposite to the first side surface of the optical sheet. can

In addition, the third protruding piece may be provided on each of a first side surface and a second side surface opposite to the first side of the optical sheet, and the light blocking pattern may be provided on each of the first side surface and the second side surface opposite to the first side surface of the optical sheet. have.

In addition, a reflective pattern may be provided on an outer surface of the first protruding piece.

Also, the first width may be 0.8 mm, and the second width may be 0.5 mm.

In the present invention, a protruding piece is formed on an optical film member of a backlight unit such as a light guide plate and an optical sheet, and a structure positioned outside the backlight unit includes a sidewall structure composed of a first sidewall portion of the bottom cover and a second sidewall portion of the guide panel. By forming an insertion hole in, it constitutes a fastening structure for inserting the protruding piece into the insertion hole. Accordingly, movement of the light guide plate and the optical sheet can be prevented, and a narrow bezel of the liquid crystal display device can be effectively implemented.

Furthermore, a light blocking pattern of the optical sheet and a reinforcing pattern of the light guide plate are provided. Accordingly, it is possible to improve the dark part phenomenon and light leakage while implementing a narrow bezel of the liquid crystal display device.

1 is a schematic cross-sectional view of a conventional liquid crystal display device;
2 is an exploded perspective view schematically illustrating a liquid crystal display device according to a first embodiment of the present invention;
3 is an exploded perspective view schematically showing a portion where an insertion hole is formed in the liquid crystal display device according to the first embodiment of the present invention.
4 is a cross-sectional view showing a portion where an insertion hole is formed in the liquid crystal display device according to the first embodiment of the present invention.
5 is a cross-sectional view showing a portion where an insertion groove is formed in the liquid crystal display device according to the first embodiment of the present invention.
6 is an exploded perspective view schematically illustrating a portion where an insertion hole is formed in a liquid crystal display device according to a second embodiment of the present invention;
7 is a cross-sectional view showing a portion where an insertion hole is formed in the liquid crystal display device according to the second embodiment of the present invention.
8 is a cross-sectional view showing a portion where an insertion groove is formed in the liquid crystal display device according to the second embodiment of the present invention.
9 schematically illustrates a light guide plate according to a second embodiment of the present invention;
10 schematically shows an optical sheet according to a second embodiment of the present invention.
11 is a view showing a state in which a dark part phenomenon occurs in the liquid crystal display device according to the first embodiment of the present invention.
12 is a view showing how the dark part phenomenon is improved in the liquid crystal display according to the second embodiment of the present invention.

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

<First Embodiment>

FIG. 2 is an exploded perspective view schematically showing a liquid crystal display device according to a first embodiment of the present invention, and FIG. 3 schematically shows a portion where an insertion hole is formed in the liquid crystal display device according to the first embodiment of the present invention. It is an exploded perspective view, and FIG. 4 is a cross-sectional view showing an insertion hole formed in the liquid crystal display device according to the first embodiment of the present invention, and FIG. 5 is an insertion groove in the liquid crystal display device according to the first embodiment of the present invention. A cross-sectional view showing the formed part.

As shown, the liquid crystal display device 100 according to the first embodiment of the present invention supports and combines the liquid crystal panel 210, the backlight unit 220, and the liquid crystal panel 210 and the backlight unit 220. It may include a guide panel 230 and a bottom cover 250, which are mechanical objects.

Here, directions in the drawing may be defined for convenience of description. The direction of the display surface of the liquid crystal panel 210 is referred to as forward or upward (or upward), and the opposite direction is referred to as backward or downward (or downward). .

The liquid crystal panel 210 is configured to display an image, and includes first and second substrates 212 and 214 facing each other and bonded together, and a liquid crystal layer (not shown) interposed between the two substrates 212 and 214.

Although not specifically shown, on the inner surface of the first substrate 212, which is called a lower substrate or an array substrate, pixels are defined by crossing a plurality of gate wires and data wires, and each pixel has a thin film transistor connected to a corresponding gate wire and data wire. and a pixel electrode connected to the thin film transistor may be formed.

In addition, on the inner surface of the second substrate 214, which is called an upper substrate or a color filter substrate as a counter substrate facing the lower substrate, a color filter pattern corresponding to each pixel and a color filter pattern are placed around the gate wiring, data wiring, and thin film. A black matrix may be formed to cover non-display elements such as transistors.

At this time, all types of liquid crystal panels can be used as the liquid crystal panel 210, for example, all types of liquid crystal panels such as IPS type, AH-IPS type, TN type, VA type, and ECB type can be used. Here, when the IPS method or the AH-IPS method is used, a common electrode forming a lateral electric field together with the pixel electrode may be formed on the first substrate 212 .

In addition, an alignment layer may be formed at the interface between the first and second substrates 212 and 214 and the liquid crystal layer to determine the initial molecular alignment direction of the liquid crystal, and to prevent leakage of the liquid crystal layer filled between the first and second substrates 212 and 214. For this purpose, seal patterns may be formed along the edges of the two substrates 212 and 214 .

In addition, a polarizing plate selectively transmitting a specific polarized light may be attached to the outer surface of each of the first and second substrates 212 and 214 .

In addition, along at least one edge of the liquid crystal panel 210, a printed circuit board is connected via a connecting member such as a flexible circuit board or a tape carrier package, so that it is bent to the rear surface of the bottom cover 250 in the modularization process so as to be in close contact with it. can

A backlight unit 220 is disposed behind the liquid crystal panel 210 configured as described above.

The backlight unit 220 may include an LED assembly 229, a white or silver reflector 225, a light guide plate 223 seated on the reflector 225, and an optical sheet 221 on the light guide plate 223. can

The LED assembly 229 functions as a light source of the backlight unit 220 and includes a plurality of LEDs 229a facing the light incident surface of the light guide plate 223 and a PCB ( Printed Circuit Board) (229b) may be included.

The light guide plate 223 into which the light emitted from the plurality of LEDs 229a is incident is uniformly spread over a wide area of the light guide plate 223 while the light incident from the LEDs 229a travels through the light guide plate 223 by multiple total reflections. Uniform surface light can be provided to the liquid crystal panel 210 by spreading.

The reflector 225 is positioned behind the light guide plate 223 and serves to reflect light passing through the rear surface of the light guide plate 223 toward the liquid crystal panel 210 to improve the luminance of the light.

At least one optical sheet 221 may be disposed on the light guide plate 223 . For example, a plurality of optical sheets 221 including a diffusion sheet and a light collecting sheet may be disposed, and by diffusing and condensing the light emitted from the light guide plate 223, the liquid crystal panel 210 produces a more uniform, high-quality product. It can act so that surface light is incident.

On the other hand, in the first embodiment of the present invention, the light guide plate 223 is provided with a protruding piece S1 protruding outward as a configuration to be coupled to the bottom cover 250 or the guide panel 230 from the side. can

In this regard, first, with respect to the four sides of the liquid crystal display device 100, the side on which the LED 229a is disposed is referred to as a third side, the side opposite to the third side is referred to as a fourth side, and the other two opposite sides are referred to as a third side. The sides are referred to as first and second sides, and the third side on which the LED 229a is disposed is said to be located on the upper side when the liquid crystal display device 100 is actually used in an upright state. Meanwhile, the third side surface on which the LED 229a is disposed may be located on the lower side of the liquid crystal display 100 in actual use according to circumstances.

At this time, the protruding pieces S1 may be formed on each of the first and second side surfaces of the light guide plate 223, and the protruding pieces S1 positioned on the first and second side surfaces may be positioned symmetrically in correspondence with each other. At least one protruding piece S1 may be formed on the side surface. In this embodiment, a case in which one protruding piece S1 is formed on each of the first and second side surfaces is taken as an example, and this protruding piece S1 is referred to as the first protruding piece S1. At this time, it is preferable that the first protruding piece S1 be located closer to the third side surface located on the upper side than the fourth side surface corresponding to the lower side of the liquid crystal display device 100 in actual use. When the first protruding piece S1 is disposed close to , the light guide plate 223 can be positioned more stably while being hung on the guide panel 230 and the bottom cover 250 . In addition, when the protruding pieces S1 are disposed on the first and second side surfaces, a more stable fastening structure can be implemented.

Furthermore, similar to the light guide plate 223, the optical sheet 221 has protruding pieces S2 and S3 protruding outward as a configuration to be coupled to the bottom cover 250 or the guide panel 230 from the side. may be provided. In this regard, for example, the protruding pieces S2 and S3 may be formed on the first and second side surfaces of the first to fourth side surfaces of the optical sheet 223, respectively, and the protruding pieces positioned on the first and second side surfaces ( S2 and S3 may be positioned symmetrically in correspondence with each other, and at least one protruding piece S2 and S3 may be formed on each side surface. In this embodiment, taking the case where two protruding pieces S2 and S3 spaced apart from each other are formed on the first and second side surfaces, respectively, the two protruding pieces S2 and S3 are respectively second and third protruding pieces S2 , S3). At this time, the second protruding piece S2 may be disposed at the same position in plan view to correspond to the upper portion of the first protruding piece S1. In this case, the first and second protruding pieces S2 together form the bottom cover 250. And there is an advantage that can be fastened to the guide panel 230. In addition, when the protruding pieces S2 and S3 are disposed on the first and second side surfaces, respectively, a more stable fastening structure can be implemented. In addition, when a plurality of protruding pieces S2 and S3 are formed on each side of the optical sheet 221, a more stable fastening structure can be implemented.

The first and second protrusions S1 and S2 formed on the light guide plate 223 and the optical sheet 221 are formed to correspond to the side surfaces of the guide panel 230 and the bottom cover 250. The third protruding piece S3 configured to be inserted into the insertion hole H1 formed by the second recessed inlet 234 and configured on the optical sheet 221 corresponds to the side surface of the bottom cover 250. It is configured to be inserted into the insertion groove (H2) formed by the inlet (254b) and the side surface of the guide panel (230) covering it. In this regard, for example, the first protruding piece S1 and the second protruding piece S2 are inserted into the insertion hole H1 together, and the third protruding piece S3 is inserted into the concave inlet 254b. As it is covered by the guide panel 230 is disposed in the insertion groove (H2).

Accordingly, the light guide plate 223 and the optical sheet 221 are stably inserted into and fastened to the guide panel 230 and the bottom cover 250, so that movement in a direction perpendicular to the plane direction can be prevented.

Here, the structure in which the protruding pieces S1, S2, and S3 are fastened using the insertion hole H1 and the insertion groove H2 is an effective fastening structure in consideration of the actual use environment in which the liquid crystal display 100 is erected, The protrusions S1, S2, and S3, the insertion hole H1, and the insertion groove H2 are located on the left and right sides of the liquid crystal display device 100 in an actual use environment, and the light guide plate 223 and the optical sheet 221 are It can be stably positioned in a state caught on the guide panel 230 and the bottom cover 250 on the left and right sides.

In particular, the narrow bezel of the liquid crystal display device 100 can be effectively realized through the fastening structure using the protrusions S1 , S2 , and S3 and the insertion hole H1 and the insertion groove H2 as described above.

In this regard, the light guide plate 223 and the optical sheet 221 are spaced apart from the bottom cover 250 or the guide panel 230 at a predetermined interval in consideration of thermal expansion in portions where the protruding pieces S1, S2, and S3 are not formed. can be configured.

Meanwhile, the light guide plate 223 and the optical sheet 221 extend outward from portions where the protruding pieces S1, S2, and S3 are formed, and furthermore, the protruding pieces ( The insertion hole (H1) into which S1 and S2 are inserted and the protruding piece (S3) are covered with the guide panel in the form of being inserted into the third concave inlet (254b) (the protruding piece (S3) is inserted into the insertion groove (H2)) form), prevention of separation of the light guide plate 223 and the optical sheet 221 and a narrow bezel can be effectively realized.

In addition, a narrow bezel can be implemented more effectively by configuring the third protruding piece S3 to be shorter than the first and second protruding pieces S1 and S2.

Also, although not shown in the drawing, a groove is formed inside the guide panel 230 covering the third concave inlet 254b, and the optical sheet 221 inserted into the third concave inlet 254b is inserted into the guide panel 230. ), it is possible to effectively realize a narrow bezel while firmly fixing the optical sheet 221 .

Meanwhile, referring to FIG. 4 , a reflective pattern 227 performing a reflective function is preferably attached to the outer surface of the first protruding piece S1 of the light guide plate 223 . In this regard, since the first protruding piece S1 of the light guide plate 223 is exposed to the outside through the insertion hole H1, a problem in that light leaks to the outside occurs through the exposed outer surface. In order to prevent light leakage, a reflective pattern 227 may be attached to an outer surface of the first protruding piece S1 of the light guide plate 223 .

In addition, it is preferable that the reflector 225 under the light guide plate 223 also has a flat shape corresponding to the light guide plate 223 so that it can be fastened to the bottom cover 250 or the guide panel 230 from the side, that is, the reflector plate. A fourth protruding piece S4 may be provided at 225 to correspond to the first protruding piece S1 of the light guide plate 223 . The fourth protruding piece S4 may be inserted into the insertion hole H1 together with the first and second protruding pieces S1 and S2.

Also, referring to FIGS. 4 and 5 , a light blocking pattern 222 may be formed at an edge of the optical sheet 221 . The light blocking pattern 222 blocks light emitted upward from the edge of the light guide plate 223 to prevent light leakage at the edge of the liquid crystal display device 100 . Here, when a plurality of optical sheets 221 are used, the light-shielding pattern 222 is preferably formed on, for example, a diffusion sheet as an optical sheet 221 positioned directly above the light guide plate 223, but is limited thereto. It doesn't work.

Hereinafter, structures of the guide panel 230 and the bottom cover 250 capable of implementing a narrow bezel will be described.

The guide panel 230 may be formed in a substantially rectangular frame (ie, frame) shape surrounding the upper and side edges of the backlight unit 220, and the liquid crystal panel 210 is attached to the upper surface of the guide panel 230. It can be. Also, the bottom cover 250 may have a substantially box shape surrounding a side surface of the backlight unit 220 while covering a lower portion of the backlight unit 220 . By using the guide panel 230 and the bottom cover 250 configured as described above, the liquid crystal panel 210 and the backlight unit 220 can be modularized.

The bottom cover 250 may include a base portion 251, a first side wall portion 252, and first and third concave inlets 254a and 254b.

The base portion 251 may have a substantially plate shape, and the backlight unit 220 may be seated on the upper surface of the base portion 251 .

The first side wall portion 252 may be formed in a shape that is vertically bent upward from an edge corner of the base portion 251, that is, a side side.

The backlight unit 220 may be accommodated in the inner accommodation space surrounded by the base portion 251 and the first sidewall portion 252 as described above.

In the first side wall portion 252 corresponding to the side surface of the optical sheet 221 on which the second and third protrusions S2 and S3 are formed, the second and third protrusions S2 and S3 are respectively formed in the downward direction. That is, the first and third recessed inlets 254a and 254b having a concave shape in the direction of the base portion 251 and an open top may be formed. A stepped structure may be formed in the first side wall portion 252 of the corresponding portion by the first and third concave inlets 254a and 254b.

The first concave inlet (254a) is disposed correspondingly and may configure the insertion hole (H1) together with the second concave inlet 234 of the guide panel 230 having a concave shape in the opposite direction.

That is, in the coupling structure between the first concave inlet 254a of the bottom cover 250 and the second concave inlet 234 of the guide panel 230, the first, second, and fourth protruding pieces S1, S2, and S4 are inserted. It is possible to define the insertion hole (H) to be.

On the other hand, the third concave inlet (254b) may be configured in a form covered by the guide panel (230).

Accordingly, it is possible to configure the insertion groove (H2) by the third concave inlet (254b) and the guide panel 230 covering it. That is, the coupling structure of the third concave inlet 254b and the guide panel 230 covering the corresponding portion can define the insertion groove H2 into which the third protrusion S3 of the optical sheet 221 is inserted. .

The guide panel 230 may include a seating portion 231, a second side wall portion 232, and a second concave inlet 234.

The seating portion 231 is positioned above the edge of the optical sheet 221 . The seating portion 231 may be configured to prevent the movement of the optical sheet 221 by pressing the lower portion. Also, the liquid crystal panel 200 may be attached to the upper surface of the mounting portion 231. Referring to FIGS. 4 and 5, the upper surface of the mounting portion 231 and the corresponding rear surface of the liquid crystal panel 210 are disposed between them. It can be coupled through an adhesive member 260 such as double-sided adhesive tape.

As such, by directly attaching the liquid crystal panel 210 to the guide panel 230 through the adhesive member 260, the liquid crystal display device 100 is configured not to separately include a top case surrounding the front edge of the liquid crystal panel 210. It can be. In this way, when the liquid crystal panel 210 is configured to be directly exposed to the outside without a top case, the liquid crystal display device 100 can have a beautiful appearance and has the advantage of being recognized by a user with a larger area. .

On the other hand, the second side wall portion 232 may be configured in a form that is vertically bent downward from the edge corner of the seating portion 231, that is, the side.

The second side wall portion 232 may be disposed to come into close contact with the outer surface of the first side wall portion 252 of the bottom cover 250 . Alternatively, the second side wall portion 232 may be positioned inside the first side wall portion 252 and closely adhered to the inner surface of the first side wall portion 252 .

In the second side wall portion 232 corresponding to the side surface of the optical sheet 221 on which the second and third protrusions S2 and S3 are formed, the mounting portion 231 is provided in an upward direction corresponding to the second protrusions S2. A second concave inlet 234 having a concave direction and an open downward direction may be formed. Here, a stepped structure may be formed in the second side wall portion 252 of the corresponding portion by the second concave inlet 234 .

As mentioned above, the second concave inlet 234 is a part constituting the insertion hole H1, which together with the first concave inlet 254a of the bottom cover 250 constitutes the insertion hole H1. can

In addition, the insertion groove H2 may be configured by the third concave inlet 254b of the bottom cover 250 and the second side wall portion 232 of the guide panel 230 covering the corresponding portion.

On the other hand, the guide panel 230 and the bottom cover 250 configured as described above may be provided with fastening means for fastening each other. Referring to FIG. 3 in this regard, a fastening groove 236 may be formed in the second side wall portion 232 of the guide panel 230, and a fastening groove may be formed in the first side wall portion 252 of the bottom cover 250. A fastening protrusion 256 inserted corresponding to 236 may be formed on the outer surface. Of course, on the contrary, fastening protrusions 256 may be formed on the inner surface of the guide panel 230, and fastening grooves may be formed on the bottom cover 250 corresponding thereto.

In addition, the guide panel 230 may be made of a black light-shielding material so as to have a light-shielding characteristic. In this way, if the guide panel 230 has light-blocking properties, it is possible to prevent light leakage to the periphery, and also to prevent the guide panel 230 from being visually recognized when viewed from the front of the display surface.

As described above, in the liquid crystal display device 100 according to the first embodiment of the present invention, the protruding pieces S1 and S2 are formed on the optical film members of the backlight unit 220 such as the light guide plate 223 and the optical sheet 221. , S3), and as a structure located outside the backlight unit, an insertion hole in the sidewall structure composed of the first sidewall portion 252 of the bottom cover 205 and the second sidewall portion 232 of the guide panel 230. (H1) and the insertion groove (H2) are formed to configure a fastening structure for inserting the protruding pieces (S1, S2, S3) into the insertion hole (H1) and the insertion groove (H2).

Accordingly, while minimizing the width of the guide panel, it is possible to effectively implement a narrow bezel of the liquid crystal display device by preventing light leakage and occurrence of dark parts.

<Second Embodiment>

The liquid crystal display device according to the second embodiment of the present invention further includes a light blocking pattern having two widths and a reinforcing pattern of the light guide plate in addition to the liquid crystal display device of the first embodiment, and this will be described in detail below. Meanwhile, for convenience of description, detailed descriptions of components identical and similar to those of the first embodiment may be omitted below.

6 is an exploded perspective view schematically showing a portion in which an insertion hole is formed in a liquid crystal display device according to a second embodiment of the present invention, and FIG. 7 is an exploded perspective view showing an insertion hole formed in a liquid crystal display device according to a second embodiment of the present invention. FIG. 8 is a cross-sectional view showing a portion where an insertion groove is formed in a liquid crystal display device according to a second embodiment of the present invention, and FIG. 9 is a schematic view of a light guide plate according to a second embodiment of the present invention. FIG. 10 is a diagram schematically illustrating an optical sheet according to a second embodiment of the present invention.

As shown, the liquid crystal display device 100 according to the second embodiment of the present invention may further include a pattern P formed on the first protruding piece S1. The pattern P formed of the first protruding piece S1 may be referred to as a reinforcing pattern. The reinforcing pattern P may be formed on the lower surface S1a of the first protruding piece S1 adjacent to the reflection plate 225 . However, it is not limited thereto, and may be formed on the upper surface S1b or the upper and lower surfaces S1a and b of the first protruding piece S1 adjacent to the optical sheet 221.

Meanwhile, referring to FIG. 9 in relation to the reinforcing pattern P, the first protruding piece S1 may be formed on each of the first and second side surfaces of the light guide plate 223, and is located on the first and second side surfaces. The first protruding pieces S1 may be positioned symmetrically in correspondence with each other, and at least one first protruding piece S1 may be formed on each side surface. In this embodiment, as an example, one first protruding piece S1 is formed on each of the first and second side surfaces, and a reinforcing pattern P is formed on the lower surface S1a of each first protruding piece S1. It takes

The reinforcing pattern P formed on the lower surface S1a of the first protruding piece S1 may be a lenticular pattern or a prismatic pattern. However, it is not limited thereto and may be a pattern of various shapes capable of changing the path of light.

As described above, when the reinforcing pattern P is formed, the path of the light leaking from the inside of the optical sheet 221 to the outside through the insertion hole H1 is changed, and the light guide plate 223 is totally reflected and proceeds in the light guide direction. By outputting a part of the light to the display area AA, the shadow phenomenon in which the corresponding part is relatively darker than other parts in which the insertion hole H1 is not formed due to light leakage through the insertion hole H1 is prevented. can be improved effectively.

In this regard, referring again to FIGS. 4 and 5 of the first embodiment, the insertion hole H1 in the liquid crystal display device is exposed to the outside, so that the optical sheet 221 proceeds outward. Light leaks out through the exposed insertion hole H1.

Accordingly, as shown in FIG. 11, light leakage through the insertion hole H1 causes a shadow phenomenon in which the corresponding part is viewed relatively darker than other parts in which the insertion hole H1 is not formed. . That is, the insertion hole H1 part has a very high dark level of about 5. Accordingly, image quality deterioration in which the edge portion of the screen is recognized like a stain is caused. In addition, light leakage occurs around the liquid crystal display due to the leaked light.

In order to improve such a dark phenomenon and light leakage, in the second embodiment, a reinforcing pattern P is formed on the lower surface S1a of the first protruding piece S1 of the light guide plate 223 inserted into the insertion hole H1. will form Accordingly, the reinforcement pattern P refracts light that is totally reflected in the light guiding direction within the light guide plate 223 and emits light to an area where a dark part occurs, thereby improving the dark part phenomenon.

In addition, the reinforcing pattern P changes the path of light traveling from the light guide plate 223 to the insertion hole H1 to reduce light leaking through the insertion hole H1, thereby preventing light leakage.

Accordingly, as shown in FIG. 12, light leakage through the insertion hole H1 is substantially completely blocked, and thus, a shadow phenomenon that is viewed as relatively dark compared to other portions in which the insertion hole H1 is not formed can be improved. there will be That is, the insertion hole H1 has a dark level substantially lowered to about 1 to have the same dark state as its surroundings. Accordingly, the stain at the edge of the screen is not recognized, and image quality can be improved. In addition, light leakage around the liquid crystal display device can be prevented by blocking light leakage through the insertion hole H1.

In addition, the liquid crystal display device 100 according to the second embodiment of the present invention may further include a light blocking pattern 222 formed on the optical sheet 221 and having two widths W1 and W2. The two widths W1 and W2 of the light blocking pattern 222 may be referred to as a first width W1 and a second width W2.

Accordingly, referring to FIG. 10 in relation to the light-shielding pattern 222 of the optical sheet 221, the second and third protruding pieces S2 and S3 are formed on the first and second side surfaces of the optical sheet 221, respectively. The second and third protruding pieces S2 and S3 located on the first and second side surfaces may be symmetrically positioned in correspondence with each other, and at least one second and third protruding pieces S2 and S3 are provided on each side surface. can be formed. In the second embodiment of the present invention, second and third protruding pieces S2 and S3 are formed on the first and second side surfaces, respectively, and the light-shielding pattern 222 corresponding to each third protruding piece S3 has a second width. A case formed of (W2) is taken as an example.

That is, the light blocking pattern 222 is formed at the edge of the optical sheet 221 . The light blocking pattern 222 blocks light emitted upward from the edge of the light guide plate 223 to prevent light leakage at the edge of the liquid crystal display device 100 .

Here, the light blocking pattern 222 corresponding to the third protruding piece S3 is formed to have a second width W2, and the other light blocking patterns 222 disposed at the edge of the optical sheet 221 have a first width. (W1) and is formed.

The second width W2 has a narrower width than the first width W1, and preferably, the first width W1 is 0.8 mm and the second width W2 is 0.5 mm, but is not limited thereto.

The light blocking pattern 222 having the first width W1 and the second width W2 is preferably formed on, for example, a diffusion sheet as an optical sheet 221 positioned directly above the light guide plate 223, but is limited thereto. It doesn't work.

Looking at this in more detail, the third concave inlet 254b of the bottom cover 250 and the second side wall portion 232 of the guide panel 230 covering the corresponding portion are formed by coupling the optical fiber to the insertion groove H2. The guide panel 230 and the light blocking pattern 222 are made of a black light blocking material so that the third protruding piece S3 of the sheet 221 is inserted so that the light emitted from the light guide plate 223 has a light blocking property. ), so as shown in FIG. 11, a shadow phenomenon observed relatively darker than other parts in which the insertion groove H2 is not formed occurs. That is, the insertion groove (H2) part has a very high dark level of about 5.

Therefore, by reducing the width W2 of the light blocking pattern 222 corresponding to the third protruding piece S3, light is reflected from the third protruding piece S3 on the guide panel 230 and the light blocking pattern 222 and emitted. By reducing the light and increasing the light emitted to the dark part, it is possible to effectively improve the dark part phenomenon generated in the portion where the insertion groove H2 is formed.

As shown in FIG. 12 , light leakage through the insertion groove H2 is substantially completely blocked, so that the shadow phenomenon, which is viewed as relatively dark compared to other parts where the insertion groove H2 is not formed, can be improved. That is, the level of the dark part of the insertion groove H2 is lowered to about 1, so that it has substantially the same dark state as its surroundings.

As described above, according to the second embodiment of the present invention, in order to improve light leakage and darkening of the insertion hole H1, the reinforcing pattern P is formed on the first protruding piece S1, and the insertion groove H2 is formed. A light blocking pattern 222 having a second width W2 is disposed in order to improve the shadow phenomenon generated in the area.

Accordingly, while realizing a narrow bezel of the liquid crystal display device, it is possible to further improve darkening and light leakage in the insertion hole and the insertion groove.

The above-described embodiment of the present invention is an example of the present invention, and free modification is possible within the scope included in the spirit of the present invention. Accordingly, this invention covers the modifications and variations of this invention within the scope of the appended claims and their equivalents.

100: liquid crystal display device 220: backlight unit
221: optical sheet 223: light guide plate
225: reflector 230: guide panel
231: seating portion 232: second side wall portion
234: second concave inlet 236: fastening groove
250: bottom cover 252: first side wall
254a: first concave inlet 254b: third concave inlet
256: fastening protrusion P: reinforcement pattern
H1: insertion hole W1, W2: first and second widths
S1, S2, S3, S4: 1st, 2nd, 3rd, 4th protruding pieces

Claims (8)

a bottom cover having a base portion and a first side wall portion;
a light guide plate on the base portion;
an optical sheet on the light guide plate;
a guide panel having a seating portion on the optical sheet and a second side wall portion;
a liquid crystal panel on the mounting portion;
a first protruding piece provided on a first side surface of the light guide plate;
a second protruding piece provided on a first side surface of the optical sheet;
a side wall structural part located outside the optical sheet and the light guide plate, composed of the first and second side wall parts, and provided with an insertion hole into which at least a second protruding piece of the first and second protruding pieces is inserted;
a reinforcing pattern provided on a lower surface of the first protruding piece;
A light-shielding pattern connected to correspond to the first side surface of the optical sheet
A liquid crystal display device comprising a.
According to claim 1,
The side wall structure further includes an insertion groove,
A third protruding piece spaced apart from the second protruding piece is provided on the first side surface of the optical sheet,
The first and second protruding pieces are inserted into the insertion hole together, and the third protruding piece is inserted into the insertion groove,
The light-shielding pattern has a first width and a second width,
The second width is disposed on the first side surface corresponding to the third protruding piece, and the second width is narrower than the first width
liquid crystal display.
According to claim 2,
The insertion hole is composed of a first concave inlet provided on the first side wall portion and a second concave inlet provided on the second side wall portion,
The insertion groove is composed of a third concave inlet provided on the first side wall portion and the second side wall portion covering the third concave inlet.
liquid crystal display.
According to claim 1,
A reflector positioned between the base portion and the light guide plate and provided with a corresponding fourth protruding piece below the first protruding piece.
A liquid crystal display device further comprising a.
According to claim 1,
The first protruding piece is provided on each of the first side and the second side opposite to the first side of the light guide plate,
The second protruding piece is provided on each of the first side and the second side opposite to the first side of the optical sheet.
liquid crystal display.
According to claim 2,
The third protruding piece is provided on each of the first side and the second side opposite to the first side of the optical sheet,
The light blocking pattern is provided on each of the first side and the second side opposite to the first side of the optical sheet.
According to claim 1,
A reflective pattern is provided on the outer surface of the first protruding piece
liquid crystal display.
According to claim 2,
The first width is 0.8mm, the second width is a liquid crystal display device consisting of 0.5mm.

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