KR102100262B1 - Liquid crystal display device - Google Patents

Abstract

The present invention relates to a liquid crystal display device, and particularly to a liquid crystal display device having a stable fastening structure.
A feature of the present invention is to form a plurality of protrusions at the edge of the cover bottom, and to form a coupling groove into which a plurality of protrusions are inserted into the rear surface of the horizontal portion of the guide panel. Through this, it is possible to provide a liquid crystal display device that is stably modular while simultaneously implementing a liquid crystal display device having a lightweight, thin, and narrow bezel.
In addition, by forming the optical sheet to cover the upper surface of the edge of the cover bottom, it is possible to prevent the optical sheet from being exposed to the outside of the guide panel, thereby preventing light leakage from occurring.
Therefore, it is possible to prevent a problem that the quality of the liquid crystal display device, such as a decrease in luminance and picture quality, is deteriorated.

Description

Liquid crystal display device

The present invention relates to a liquid crystal display device, and particularly to a liquid crystal display device having a stable fastening structure.

The liquid crystal display device (LCD), which is actively used in TVs, monitors, etc. because it is advantageous for moving picture display and has a large contrast ratio, is an optical anisotropy and polarization of liquid crystal. It shows the principle of image implementation.

This liquid crystal display device is a liquid crystal panel (liquid crystal panel) bonded by interposing a liquid crystal layer between two substrates (substrate) as an essential component, the electric field in the liquid crystal panel to change the arrangement direction of the liquid crystal molecules to realize the difference in transmittance do.

However, since the liquid crystal panel does not have a light emitting element, a separate light source is required to display a difference in transmittance as an image, and for this purpose, a backlight having a light source is disposed on the rear surface of the liquid crystal panel.

The backlight unit uses a cold cathode fluorescent lamp (CCFL), an external electrode fluorescent lamp, and a light emitting diode (LED).

Among them, in particular, LEDs have a characteristic of small size, low power consumption, high reliability, and are widely used as a light source for display.

On the other hand, the general backlight unit is divided into a direct type (Direct type) and an edge type (Edge type) method according to the arrangement structure of the lamp. In the edge type method, one or a pair of light sources has one or two or two pairs of light guide plates. A light source has a structure disposed on each side of each of the light guide plates, and the direct type method is a structure in which several light sources are disposed on a lower portion of the liquid crystal panel.

Here, the direct-type method has a limitation in thinning, and is mainly used in a liquid crystal display device in which brightness is more important than the thickness of the screen. The edge-type method that is lighter and thinner than the direct-type method is the same as a notebook PC or a monitor PC. It is mainly used in liquid crystal displays where thickness is important.

1 is a cross-sectional view of a liquid crystal display including a general edge type backlight unit using an LED as a light source.

As illustrated, a liquid crystal display device including a general edge type backlight unit 20 includes a liquid crystal panel 10 and a backlight unit 20, a guide panel 30, a cover bottom 50, and a top cover ( 40).

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

In addition, reference numerals 19a and 19b denote a polarizing plate attached to the front and rear surfaces of the liquid crystal panel 10 to control the polarization direction of light, respectively.

The backlight unit 20 is provided behind the liquid crystal panel 10.

The backlight unit 20 is arranged along the longitudinal direction of at least one edge of the guide panel 30, and the LED assembly 29 made of a plurality of LEDs 29a and a PCB 29b on which the LEDs 29a are mounted, and a cover It includes a white or silver reflector 25 seated on the bottom 50, a light guide plate 23 seated on the reflector 25, and an optical sheet 21 positioned thereon.

The liquid crystal panel 10 and the backlight unit 20 have a top cover 40 that surrounds the top edge of the liquid crystal panel 10 and a back surface of the backlight unit 20 in a state where the edges are surrounded by a rectangular frame-shaped guide panel 30. Cover cover (50) covering each is coupled in front and rear respectively, and is integrated through the guide panel (30).

On the other hand, in recent years, such liquid crystal display devices, as well as portable computers, desktop computer monitors, and wall-mounted televisions, etc., are increasingly in use, and researchers who want to have a significantly reduced weight and volume while having a large display area. It is actively progressing.

In addition, in addition to light weight and thinness, the liquid crystal display device is also required for a narrow bezel in which a display area is wide and a bezel area that is a non-display area other than the display area is formed as small as possible.

Accordingly, efforts are being made to reduce the thickness of the top cover 40 for modularizing the liquid crystal panel 10 and the backlight unit 20, the cover bottom 50, and the guide panel 30. 40) When the thickness of the guide panel 30 serving as a medium is reduced so that the cover bottom 50 is integrated, it is difficult to stably modularize the liquid crystal display device.

That is, when the thickness of the guide panel 30 is thin, the separation of the guide panel 30 occurs even by a small external force, so that the top cover 40 and the cover bottom 50 and the guide panel 30 are fastened. It collapses and the liquid crystal display device is not stably modularized.

In addition, when the thickness of the guide panel 30 is thin, as the overlapping region A of the optical sheet 21 and the guide panel 30 is formed narrow, the optical sheet 21 is moved outward of the guide panel 30. When the optical sheet 21 is exposed to the outside of the guide panel 30 as described above, a light leakage phenomenon occurs as shown in FIG. 2.

Due to this, the quality of the liquid crystal display device such as deterioration in brightness and image quality is deteriorated.

The present invention is to solve the above problems, and has a first object to provide a liquid crystal display device that is lighter, thinner, and has a narrow bezel and can be more stably modularized.

In addition, a second object is to prevent light leakage from occurring, and a third object is to improve luminance and image quality of the liquid crystal display device.

In order to achieve the object as described above, the present invention is a liquid crystal panel; A backlight unit positioned at a lower portion of the liquid crystal panel and including an optical sheet having a guide groove at an edge; A cover bottom comprising a horizontal surface on which the liquid crystal panel and the backlight unit are seated, an edge portion perpendicular to the horizontal surface, and a protrusion portion protruding from an upper surface of the edge portion corresponding to the guide groove, and an edge of the liquid crystal panel It provides a liquid crystal display device including a guide panel having a vertical portion that surrounds and a horizontal portion on which the liquid crystal panel is seated, and a fastening groove into which the protrusion is inserted is inserted on the rear surface of the horizontal portion.

At this time, the optical sheet covers the upper surface of the edge portion, and the protrusion is provided with at least two along the longitudinal direction of the edge portion.

Then, the protrusion is higher than the thickness of the optical sheet from the edge, and protrudes to be smaller than the thickness of the horizontal portion, and the width of the protrusion is smaller than the width of the guide groove.

In addition, both edges of the protruding portion are formed to be inclined to have an inclination angle with an upper surface of the edge portion, and the backlight unit includes a light guide plate positioned under the optical sheet, an LED assembly arranged along one edge of the light guide plate, and It includes a reflector located below the light guide plate.

As described above, by forming a plurality of protrusions at the edge of the cover bottom according to the present invention, and forming a coupling groove into which a plurality of protrusions are inserted into the rear surface of the guide panel, light and thin and narrow bezels are formed. It is possible to provide a liquid crystal display device stably and modularly while simultaneously implementing the liquid crystal display device.

In addition, by forming the optical sheet to cover the upper surface of the edge of the cover bottom, it is possible to prevent the optical sheet from being exposed to the outside of the guide panel, and there is an effect of preventing light leakage from occurring.

Therefore, there is an effect that can prevent the problem that the quality of the liquid crystal display device, such as a decrease in brightness and image quality is caused.

1 is a cross-sectional view of a liquid crystal display including a general edge type backlight unit using an LED as a light source.
2 is a photograph of a light leakage phenomenon of a typical liquid crystal display device.
3 is an exploded perspective view of a liquid crystal display device according to an embodiment of the present invention.
4 is a perspective view schematically showing a cover bottom of a liquid crystal display device according to an exemplary embodiment of the present invention.
5 is a perspective view schematically showing a state in which the backlight unit is seated on the cover bottom.
Figure 6a ~ 6b is a perspective view schematically showing the fastening of the cover bottom and the guide panel.
Fig. 7 is a schematic cross-sectional view of the modularized Fig. 3;

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

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

As illustrated, the liquid crystal display device is composed of a liquid crystal panel 110 and a backlight unit 120, a guide panel 130, a top cover 140 and a cover bottom 150.

At this time, if the direction on the drawing is defined for convenience of explanation, 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 outlines thereof are disposed. With a rectangular frame-shaped guide panel 130, the top cover 140 is positioned in front of the liquid crystal panel 110, and the cover bottom 150 is positioned on the rear surface of the backlight unit 120, from the front and rear. Combined and unified.

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 the image expression of the liquid crystal display, and the first substrate 112 and the second substrate 114 bonded to each other and the liquid crystal layer interposed therebetween. (Not shown).

Here, although not shown on the drawing, a plurality of gate lines and data lines are intersected and pixels are defined on the inner surface of the first substrate 112, commonly referred to as a lower substrate or an array substrate, and a thin film transistor is formed at each intersection point. (thin film transistor: TFT) is provided and is connected one-to-one with the transparent pixel electrode formed on each pixel.

And the inner surface of the second substrate 114, called an upper substrate or a color filter substrate, is an example corresponding to each pixel, such as red (R), green (G), blue (B) color filter (color filter) and these A black matrix is provided to cover each gate line, data line, and thin film transistor.

In addition, a red (R), green (G), and blue (B) color filter and a transparent common electrode covering the black matrix are provided.

At this time, although not clearly shown in the drawings, the upper and lower alignment layers (not shown) interposing the initial molecular alignment direction of the liquid crystal are interposed at the boundary between the two substrates 112 and 114 and the liquid crystal layer (not shown). , A seal pattern (not shown) is formed along the edges of both the substrates 112 and 114 to prevent leakage of the liquid crystal layer (not shown) filled between the first and second substrates 112 and 114. .

In addition, polarizing plates 119a, 119b (see FIG. 7) selectively transmitting only specific light are attached to the outer surfaces of the first and second substrates 112 and 114, respectively.

A printed circuit board 117 is connected via a connecting member 116 such as a flexible circuit board or a tape carrier package (TCP) along one edge of the liquid crystal panel 110 to guide the module in the modularization process. The side surface of the panel 130 or the cover bottom 150 is properly flipped to the back surface to be in close contact.

Accordingly, when the selected thin film transistor for each gate line is turned on by the on / off signal of the thin film transistor scanned and transferred to the gate line, the liquid crystal panel 110 displays an image signal of the data line to the corresponding pixel electrode. Is transferred, and the alignment direction of the liquid crystal molecules is changed by an electric field between the pixel electrode and the common electrode, thereby representing a difference in transmittance.

In addition, the liquid crystal display device according to the present invention is provided with a backlight unit 120 for supplying light from its rear surface so that a difference in transmittance represented by the liquid crystal panel 110 is externally expressed.

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 reflective plate 125, a light guide plate 123 mounted on the reflective plate 125, and And an optical sheet 121 positioned above the light guide plate.

The LED assembly 129 is a light source of the backlight unit 120, and is located on one side of the light guide plate 123 so as to face the light incident surface of the light guide plate 123, and the LED assembly 129 includes a plurality of LEDs 129a, It includes a plurality of LED (129a) PCB (129b) is mounted spaced apart at regular intervals.

In this case, the plurality of LEDs 129a emit light having red (R), green (G), and blue (B) colors toward the light incident surface of the light guide plate 123, respectively, and the plurality of RGB LEDs 129a ) Can be turned on all at once to realize white light by color mixing.

In particular, in order to improve luminous efficiency and brightness, in particular, blue LED 129a including a blue LED chip having excellent luminous efficiency and brightness is used, and as a phosphor, 'cerium doped yttrium aluminum garnet (YAG: Ce)', That is, a blue LED 129a made of a yellow phosphor is used.

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

The light guide plate 123 through which the light emitted from the plurality of LEDs 129a is incident is evenly distributed over a wide area of the light guide plate 123 while the light incident from the LED 129a progresses in the light guide plate 123 by multiple total reflections. Spreads to provide a surface light source for the liquid crystal panel 110.

The light guide plate 123 is excellent in transparency, weather resistance, and colorability, and induces light diffusion when light is transmitted.

In addition, the light guide plate 123 may include a pattern having a specific shape on the lower surface 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 reflector 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, thereby improving the luminance of the light.

The optical sheet 121 above the light guide plate 123 includes a diffusion sheet and at least one light collecting sheet, and diffuses or collects light passing through the light guide plate 123 to provide a more uniform surface light source to the liquid crystal panel 110. Try to join.

At this time, a plurality of guide grooves 121a are formed along the edge of the optical sheet 121.

The liquid crystal panel 110 and the backlight unit 120 are modularized through the top cover 140, the guide panel 130, and the cover bottom 150. The top cover 140 includes the top edge of the liquid crystal panel 110 and Configured to cover the sides.

Here, the top cover 140 is a rectangular frame shape in which the cross section is bent in an “a” shape to cover the top and side edges of the liquid crystal panel 110, and the front surface of the top cover 140 is opened to open the liquid crystal panel 110. It is configured to display an image implemented in.

The guide panel 130 supports the edges of the liquid crystal panel 110 and has a rectangular frame shape to surround the edges of the backlight unit 120, and the vertical portion 131 and the vertical portion 131 surrounding the side surface of the backlight unit 120 ), A horizontal portion 133 is provided to separate the positions of the liquid crystal panel 110 and the backlight unit 120.

The liquid crystal panel 110 is attached and fixed on the horizontal portion 133 through an adhesive pad (not shown) such as a double-sided tape.

Here, the thickness of the vertical portion 131 of the guide panel 130 of the present invention is about 0.6mm to have a thin thickness. Through this, the liquid crystal display device of the present invention realizes a lightweight, thin and narrow bezel.

And, such a guide panel 130 is seated on the cover bottom 150, the cover bottom 150 is made of a horizontal surface 151 and the edge portion 153 of the edge of the horizontal surface 151 is vertically bent.

At this time, a plurality of protrusions 155 extending from the upper surface of the edge portion 153 is formed on the edge portion 153 of the cover bottom 150, and the plurality of protrusions 155 are formed on the edge of the optical sheet 121. It is located corresponding to the guide groove (121a).

In addition, a coupling groove 135 into which a plurality of protrusions 155 are inserted is formed on the rear surface of the horizontal portion 133 of the guide panel 130 corresponding to the plurality of protrusions 155.

Therefore, the liquid crystal display device of the present invention is formed to have a thin thickness of the guide panel 130, but it is possible to implement a liquid crystal display device having a lightweight, thin, and narrow bezel, but a fastening force between the guide panel 130 and the cover bottom 150. This is strengthened, so that even when an external force is applied, the separation phenomenon of the guide panel 130 does not occur.

Therefore, it is possible to provide a stably modularized liquid crystal display device.

In addition, in the process in which the protrusion 155 is guided by the guide groove 121a of the optical sheet 121, the edge of the optical sheet 121 is formed to cover the upper surface of the edge portion 153 of the cover bottom 150. do. Therefore, it is possible to prevent the optical sheet 121 from being exposed to the outside of the guide panel 130, thereby preventing light leakage from occurring.

Therefore, it is possible to prevent a problem that the quality of the liquid crystal display device, such as a decrease in luminance and picture quality, is deteriorated. We will look at this in more detail later.

The guide panel 130, the cover bottom 150, and the top cover 140 have the edges of the liquid crystal panel 110 and the backlight unit 20 wrapped around the edges of the liquid crystal panel 110 with the guide panel 130 in the state. The covering top cover 140 and the cover bottom 150 covering the back surface of the backlight unit 120 are combined in front and rear, respectively, and are integrally modularized through the guide panel 130.

At this time, the top cover 140 is sometimes called a case top or a top case, the guide panel 130 is also called a support main or main support, a mold frame, and the cover bottom 150 is also called a bottom cover or a bottom cover. Sometimes it loses.

At this time, the liquid crystal display device having the above-described structure may remove the top cover 140 in order to realize a light-weight and thin liquid crystal display device that has been recently required. Through the removal of the top cover 140, light weight and thinness of the liquid crystal display device are possible, and it has an effect of simplifying the process.

In addition, due to the removal of the top cover 140 made of a metal material, it is possible to reduce the process cost.

The liquid crystal display device according to the above-described embodiment of the present invention forms a plurality of protrusions 155 on the edge portion 153 of the cover bottom 150, and a plurality of rear surfaces of the horizontal portion 133 of the guide panel 130. By forming the coupling groove 135 into which the two protrusions 155 are inserted, it is possible to provide a liquid crystal display device having a light weight, thinness, and narrow bezel, while stably modularizing the liquid crystal display device.

In addition, by forming the optical sheet 121 so as to cover the upper surface of the edge portion 153 of the cover bottom 150, it is possible to prevent the optical sheet 121 from being exposed to the outside of the guide panel 130, resulting in light leakage. It can be prevented from occurring. Therefore, it is possible to prevent a problem that the quality of the liquid crystal display device, such as a decrease in luminance and picture quality, is deteriorated.

4 is a perspective view schematically showing a cover bottom of a liquid crystal display according to an embodiment of the present invention, and FIG. 5 is a perspective view schematically showing a state in which a backlight unit is mounted on the cover bottom.

As shown, the cover bottom 150 provides a liquid crystal display by providing a horizontal surface 151 on which a backlight unit (120 in FIG. 3) including a liquid crystal panel (110 in FIG. 3) and a guide panel (130 in FIG. 3) are seated. It serves as a subframe that supports the entire device while minimizing light loss.

Looking at this in more detail, the cover bottom 150 is a quadrangular plate shape having four vertically bent edges, and a horizontal surface 151 closely contacting the back surface of the backlight unit (120 in FIG. 3) and an edge thereof vertically. It consists of an upwardly bent edge portion 153.

At this time, the edge portion 153 is formed by protruding a plurality of protrusions 155 from the upper surface of the edge portion 153, the plurality of protrusions 155 are formed at least two along the longitudinal direction of the edge portion 153 do.

On the cover bottom 150, a backlight unit (120 of FIG. 3) around which an edge is surrounded by the guide panel 130 is seated, and sequentially reflectors (125 in FIG. 3) on the horizontal surface 151 of the cover bottom 150. ) And the light guide plate (123 in FIG. 3) and the optical sheet 121 are seated, and the LED assembly (129 in FIG. 3) is positioned along one edge.

At this time, the optical sheet 121 is seated to cover the upper surface of the edge portion 153 of the cover bottom 150, the cover bottom 150 in a plurality of guide grooves 121a formed along the edge of the optical sheet 121 A plurality of protrusions 155 of each are inserted.

Therefore, in the process of seating the optical sheet 121 to cover the upper surface of the edge portion 153 of the cover bottom 150, the flow of the optical sheet 121 through the protrusion 155 inserted in the guide groove 121a This will be prevented.

Here, the height h of the protrusion 155 is preferably formed to have a large height compared to the thickness of the optical sheet 121 positioned above the light guide plate (123 of FIG. 3), but at this time, the height of the protrusion 155 (h) is preferably lower than the thickness of the horizontal portion (133 of FIG. 3) of the guide panel (130 of FIG. 3).

Therefore, the entire optical sheet 121 can be guided through the protruding portion 155, but the thickness of the entire liquid crystal display device is not thickened by the protruding portion 155.

And, the width (w) of the protrusion 155 is formed corresponding to the width of the guide groove (121a) of the optical sheet 121, at this time, the width of the protrusion 155 is the guide groove (1221a) of the optical sheet (121) ) Is formed narrower than the width, so that the contact area between the protrusion 155 and the guide groove 121a is minimized.

In particular, by forming both edges of the protrusion 155 inclined to have a predetermined inclination angle with the upper surface of the edge portion 153 of the cover bottom 150, the contact area between the protrusion 155 and the guide groove 121a is minimized. can do.

In this way, by making the contact area between the protrusion 155 and the guide groove 121a to be minimized, in the process of guiding the optical sheet 121 by inserting the protrusion 155 into the guide groove 121a of the optical sheet 121 It is possible to prevent a problem such as tearing of the optical sheet 121 by the protrusion 155.

In addition, as the guide groove 121a and the protrusion 155 of the optical sheet 121 are contacted, the guide groove 121a of the optical sheet 121 may appear darker than other areas, so the protrusion 155 and the guide By making the contact area of the groove 121a to be minimized, the above phenomenon can also be minimized.

6A to 6B are perspective views schematically showing the fastening of the cover bottom and the guide panel.

As shown, on the horizontal plane 151 of the cover bottom 150, a reflector (125 in FIG. 3), a light guide plate (123 in FIG. 3), and an optical sheet 121 are sequentially placed, and an LED assembly along one edge ( 129 in FIG. 3 is located.

At this time, the optical sheet 121 is seated to cover the upper surface of the edge portion 153 of the cover bottom 150, the cover bottom 150 in a plurality of guide grooves 121a formed along the edge of the optical sheet 121 The protrusion 155 of the insertion, the protrusion 155 of the cover bottom 150 is formed to have a height (h in Figure 4) greater than the thickness of the optical sheet 121, the protrusion 155 is an optical sheet ( 121) protrudes to the outside of the guide groove (121a).

The guide panel 130 is located in front of the cover bottom 150, and is assembled and fastened with the cover bottom 150. The vertical portion 131 of the guide panel 130 is an edge portion of the cover bottom 150. It is assembled and fastened to each other so as to be in close contact with the outer surface of (153).

At this time, the fastening groove 135 is formed on the rear surface of the horizontal portion 133 of the guide panel 130, so that the guide panel 130 and the cover bottom 150 are assembled and fastened to each other to cover the cover bottom 150. The protruding portion 155 formed on the edge portion 153 is inserted into the fastening groove 135 formed on the rear surface of the horizontal portion 133 of the guide panel 130.

Therefore, the liquid crystal display device of the present invention is formed to have a thin thickness of the guide panel 130, but it is possible to implement a liquid crystal display device having a lightweight, thin, and narrow bezel, but a fastening force between the guide panel 130 and the cover bottom 150. This is strengthened, so that even when an external force is applied, the separation phenomenon of the guide panel 130 does not occur.

Through this, it is possible to provide a stable and modular liquid crystal display device.

In addition, by forming the optical sheet 121 so as to cover the upper surface of the edge portion 153 of the cover bottom 150, it is possible to prevent the optical sheet 121 from being exposed to the outside of the guide panel 130, resulting in light leakage. It can be prevented from occurring. Therefore, it is possible to prevent a problem that the quality of the liquid crystal display device, such as a decrease in luminance and picture quality, is deteriorated.

In addition, the optical sheet 121, while covering the upper surface of the edge portion 153 of the cover bottom 150, by inserting the protrusion 155 of the cover bottom 150 into the guide groove 121a, the optical sheet 121 It can prevent the flow of.

7 is a cross-sectional view schematically showing the modularized FIG. 3.

As shown in the figure, the LED assembly 129 and the light guide plate 123 made of a reflective plate 125, a light guide plate 123, and a PCB 129b on which the LEDs 129a and LEDs 129a are mounted are optical sheets ( 121) are stacked to form the backlight unit 120.

In addition, a liquid crystal panel 110 in which a liquid crystal layer (not shown) is interposed is disposed between the first and second substrates 112 and 114 and the first and second substrates 112 on the upper portion of the backlight unit 120. , 114) are attached to the outer surfaces of the polarizing plates 119a and 119b selectively transmitting only specific light.

Here, the liquid crystal panel 110 whose edges are surrounded by the backlight unit 120 and the guide panel 130 is seated on the horizontal surface 151 of the cover bottom 150, so that the edge portion 153 of the cover bottom 150 ) The outer surface of the guide panel 130 is positioned in close contact with the inner surface of the vertical portion 131.

At this time, the liquid crystal panel 110 is seated and supported on the horizontal portion 133 of the guide panel 130.

In addition, the top cover 140 is assembled with the guide panel 130 so as to cover the edge of the upper surface of the liquid crystal panel 110 and to have a side surface surrounding the outer surface of the vertical portion 131 of the guide panel 130.

At this time, a plurality of protrusions 155 formed on the upper surface of the edge portion 153 of the cover bottom 150 is inserted into the fastening groove 135 formed on the rear surface of the horizontal portion 133 of the guide panel 130, the guide The panel 130 and the cover bottom 150 are stably assembled and fastened to each other.

That is, in order to realize a liquid crystal display device having a lightweight, thin, and narrow bezel, which has been recently required, the thickness of the guide panel 130 is intended to be reduced. When the thickness of the guide panel 130 is reduced as described above, even with a small external force, The deviation of the guide panel 130 occurs. Through this, the liquid crystal display device is not stably modularized.

However, in the liquid crystal display device according to the exemplary embodiment of the present invention, a plurality of protrusions 155 are formed on the upper surface of the edge portion 153 of the cover bottom 150, and the plurality of protrusions 155 are provided on the guide panel 130. By allowing a plurality of fastening grooves 135 formed on the rear surface of the horizontal portion 133 to be inserted, the fastening force between the cover bottom 150 and the guide panel 130 is improved, so even if an external force acts on the guide panel 130 , Since the fastening force between the guide panel 130 and the cover bottom 150 is strong, it is possible to prevent the guide panel 130 from being separated.

Therefore, it is possible to stably modularize the liquid crystal display device.

On the other hand, in the liquid crystal display device according to an embodiment of the present invention, as the optical sheet 121 is formed to cover the upper surface of the edge portion 153 of the cover bottom 150, the optical sheet 121 and the guide panel 130 The overlapping region (B) of the conventional liquid crystal display device is formed wider than the overlapping region (A in FIG. 1) of the optical sheet (21 in FIG. 1) and the guide panel (30 in FIG. 1).

Therefore, the optical sheet 121 can be prevented from being exposed to the outside of the guide panel 130, the light leakage phenomenon that can occur as the optical sheet 121 is exposed to the outside of the guide panel 130 occurs Can be prevented.

Due to this, it is possible to prevent the problem that the quality of the liquid crystal display device, such as deterioration in brightness and image quality, is deteriorated.

As described above, in the liquid crystal display device according to the exemplary embodiment of the present invention, a plurality of protrusions 155 are formed at the edge portion 153 of the cover bottom 150, and the horizontal portion 133 of the guide panel 130 is formed. By forming a coupling groove 135 into which a plurality of protrusions 155 are inserted into the rear surface, it is possible to provide a liquid crystal display device having a light weight, thinness, and narrow bezel, while stably modularizing the liquid crystal display device.

In addition, by forming the optical sheet 121 so as to cover the upper surface of the edge portion 153 of the cover bottom 150, it is possible to prevent the optical sheet 121 from being exposed to the outside of the guide panel 130, resulting in light leakage. It can be prevented from occurring.

Therefore, it is possible to prevent a problem that the quality of the liquid crystal display device, such as a decrease in luminance and picture quality, is deteriorated.

The present invention is not limited to the above-described embodiments, and can be implemented by variously changing within the limits without departing from the gist of the present invention.

110: liquid crystal panel (112, 114: first and second substrates, 119a, 119: first and second polarizing plate)
120: backlight unit (121: optical sheet (121a: guide groove), 123: light guide plate, 125: reflector, 129: LED assembly (129a: LED, 129b: PCB))
130: guide panel (131: vertical portion, 133: horizontal portion, 135: fastening groove)
140: top cover
150: cover bottom (151: horizontal plane, 153: edge, 155: protrusion)

Claims (7)

A liquid crystal panel;
A backlight unit positioned at a lower portion of the liquid crystal panel and including an optical sheet having a guide groove at an edge;
A cover bottom comprising a horizontal surface on which the liquid crystal panel and the backlight unit are seated, an edge portion perpendicular to the horizontal surface, and a protrusion portion protruding from an upper surface of the edge portion corresponding to the guide groove;
A guide panel comprising a vertical portion surrounding the edge of the liquid crystal panel and a horizontal portion on which the liquid crystal panel is seated, and a fastening groove into which the protrusion is inserted is formed on the rear surface of the horizontal portion.
It includes,
The optical sheet covers the upper surface of the edge portion excluding the protruding portion,
The optical sheet is positioned completely overlapping the light guide plate and the edge portion located at the bottom,
Both edges of the protruding portion are inclined to have an inclination angle with the upper surface of the edge portion, and the distance between the both sides of the guide groove gradually increases as the both edges are further away from the upper surface.
delete According to claim 1,
The protrusion is provided with at least two along the longitudinal direction of the edge portion of the liquid crystal display device.
According to claim 1,
The protruding portion is higher than the thickness of the optical sheet from the edge, the liquid crystal display device protruding to be smaller than the thickness of the horizontal portion.
According to claim 1,
The width of the protrusion is less than the width of the guide groove, the liquid crystal display device.
delete According to claim 1,
The backlight unit is a liquid crystal display device including an LED assembly arranged along one edge of the light guide plate, and a reflector positioned under the light guide plate.

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