KR20160001872A - liquid crystal display device - Google Patents

Abstract

The present invention relates to a liquid crystal display device and, more specifically, to a liquid crystal display device which can minimize the flow of a light guide plate while considering assembly and expansion of the light guide plate. According to the present invention, a light guide plate guide is attached and fixed on an anti-light incident surface of the light guide plate, and a guide groove which can guide the light guide plate guide is formed on a side surface of a cover bottom. Therefore, the present invention can minimize the flow of the light guide plate in a modularized liquid crystal display device, improve the assembly of the light guide plate, and prevent the occurrence of flexure by the expansion.

Description

[0001] The present invention relates to a liquid crystal display device,

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 minimizing the flow of a light guide plate while considering the assembly of the light guide plate and the expansion of the light guide plate.

A liquid crystal display device (LCD), which is advantageous for moving picture display and has a large contrast ratio and is actively used in TVs and monitors, exhibits optical anisotropy and polarization properties of a liquid crystal, And the like.

Such a liquid crystal display device has a liquid crystal panel in which a liquid crystal panel is interposed between two adjacent substrates through a liquid crystal layer as an essential component and changes the alignment direction of the liquid crystal molecules in an electric field in the liquid crystal panel to realize a difference in transmittance do.

However, since the liquid crystal panel does not have its own light emitting element, a separate light source is required to display the difference in transmittance as an image. To this end, a backlight having a light source is disposed on the back surface of the liquid crystal panel.

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

As shown in the figure, a typical liquid crystal display device includes a liquid crystal panel 10, a backlight unit 20, a guide panel 30, a cover bottom 50, and a top cover 40.

The liquid crystal panel 10 is constituted by first and second substrates 12 and 14 which are in contact with each other with a liquid crystal layer interposed therebetween, which plays a key role in image display.

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

The backlight unit 20 includes an LED assembly 29 arranged along one longitudinal edge of the guide panel 30, a white or silver reflective plate 25 seated on the cover bottom 50, ) And a plurality of optical sheets 21 interposed therebetween.

The LED assembly 29 is formed on one side of the light guide plate 23. The LED assembly 29 includes a plurality of LEDs 29a and an LED PCB 29b on which a plurality of LEDs 29a are mounted. .

The liquid crystal panel 10 and the backlight unit 20 are covered with a top cover 40 covering the top edge of the liquid crystal panel 10 with the edges thereof being surrounded by a rectangular guide panel 30, The cover bottoms 50 are integrally joined to each other through the guide panel 30.

And reference numerals 19a and 19b denote polarizing plates attached to the front and back surfaces of the liquid crystal panel 10 to control the polarization direction of light, respectively.

On the other hand, in the thus configured liquid crystal display device, the light emitted from the LED 29a depends on the distance between the LED 29a and the light incoming surface of the light guide plate 23, so that the optimum optical distance is required to be maintained.

The yellowing and twisting of the light guide plate 23 may occur if the distance between the LED 29a and the light entrance surface of the light guide plate 23 is shorter than the optimum optical distance, If the distance is longer than the optimum optical distance, the light efficiency is lowered and the luminance of light supplied to the liquid crystal panel 10 is lowered.

Therefore, in order to keep the distance between the LED 29a and the light incident surface of the light guide plate 23 equal to the optimum optical distance as designed in the manufacture of the liquid crystal display device, a light guide plate 23 And a stopper (not shown) for maintaining the position of the stopper.

A stopper (not shown) is provided on the cover bottom 50 in a protruding shape, and a groove (not shown) corresponding to a stopper (not shown) is formed at the corner of the light guide plate 23. At this time, the stopper (not shown) and the grooves (not shown) of the light guide plate 23 are positioned with a predetermined gap therebetween. This increases the assemblability of the light guide plate 23 in the process of assembling the backlight unit 20 At the same time, it is designed in consideration of the case where the light guide plate 23 is expanded due to heat generated from the LED 29a.

However, if the distance between the stopper (not shown) and the groove (not shown) of the light guide plate 23 is reduced, the flow of the light guide plate 23 can be reduced. However, And the image display quality of the liquid crystal panel 10 is lowered.

If the distance between the stopper (not shown) and the groove (not shown) of the light guide plate 23 is increased, the problem of the light guide plate 23 being expanded and bent due to the heat generated by the LED 29a can be reduced. Is generated and the distance between the LED 29a and the light incident surface of the light guide plate 23 is changed to cause a problem that the light efficiency is lowered.

In addition, when flow of the light guide plate 23 occurs, foreign matter may be generated due to the shrinkage of the light guide plate 23, and a uniform surface light source can not be realized due to the shrinkage of the light guide plate 23 in the course of realizing the surface light source Lt; / RTI >

Particularly, when the stopper (not shown) is made of a material having an elastic force such as silicon, the amount of compression due to the elasticity of the stopper (not shown) also causes the flowability of the light guide plate 23 to increase.

When the distance between the stopper (not shown) and the grooves (not shown) of the light guide plate 23 is increased, the display area which is recently required is widened according to the distance therebetween, bezel region can not implement a narrow bezel that is as small as possible.

SUMMARY OF THE INVENTION It is a first object of the present invention to minimize the flow of a light guide plate while considering expansion due to heat of a light guide plate.

A second object of the present invention is to improve the screen display quality of the liquid crystal display device.

A third object of the present invention is to provide a liquid crystal display device having a narrow bezel.

In order to achieve the object as described above, the present invention provides a light emitting device comprising: an LED assembly; A light guide plate including a light incident surface corresponding to the LED assembly, a light incident surface on the opposite side of the light incident surface, and both side surfaces connecting the light incident surface and the light incident surface; A light guiding plate guide including a supporting portion attached to the carrying light surface and both side surfaces of the light guide plate, and a guide portion projecting outward from the supporting portion; A liquid crystal panel seated on the optical sheet; And a cover bottom having a horizontal surface on which the light guide plate is seated and a side surface that is vertically bent from the horizontal surface, and a guide groove formed on the side surface with the guide portion being inserted and guided.

At this time, both sides of the guide groove include a guide end bent perpendicularly from the side face to the inside, and a gap between the side face of the cover bottom and the support portion of the guide of the light guide plate is set to be a spacing distance .

The optical sheet fixing part is protruded upward from the guide part, the optical sheet is mounted on the light guide plate, a protrusion including a fixing hole is formed along the edge of the optical sheet, Is inserted.

The backlight unit may further include a guide panel including a vertical portion covering an edge of the backlight unit and a horizontal portion supporting a rear edge of the liquid crystal panel, and a protruding protrusion for pressing the guide portion is provided under the horizontal portion of the guide panel And a reflector positioned below the light guide plate.

As described above, according to the present invention, the light guide plate guide is attached and fixed to both the light incident side and the light incident side of the light guide plate, and the guide groove is formed on the side surface of the cover fall to guide the light guide plate guide, The flow of the light guide plate can be minimized, and the assembling property of the light guide plate can be improved, and warping due to expansion can be prevented.

As a result, it is possible to prevent a problem that the distance between the LED and the light-incident surface of the light guide plate is changed to reduce the light efficiency of the backlight unit.

In addition, it is possible to prevent the occurrence of foreign objects caused by the flow of the light guide plate, thereby preventing the deterioration of the image quality of the liquid crystal panel.

In addition, there is an effect that it is possible to prevent a problem that the light incident into the light guide plate due to the light guide plate can not be uniformly spread to the wide area of the light guide plate, thereby failing to realize a uniform surface light source. And it is possible to improve the screen display quality of the liquid crystal display device.

Further, since an assembly gap designed to improve the assembling property of the light guide plate and the expansion gap designed in consideration of the expansion of the light guide plate due to heat are not separately required, an effect of providing a liquid crystal display device having a narrow bezel have.

Further, it is possible to fix the position of the optical sheet positioned above the light guide plate through the light guide plate guide, thereby preventing deterioration of screen display quality due to the flow of the optical sheet. Further, It is possible to shorten the process assembly time and lower the process cost.

In addition, a separate fixing structure for fixing the optical sheet can be omitted, and a lightweight, thin and narrow bezel can be realized.

1 is a sectional view of a general liquid crystal display device.
2 is a perspective view schematically showing a liquid crystal display device according to an embodiment of the present invention.
FIG. 3A is a perspective view schematically showing a part of a cover bottom and a light guide plate to which a light guide guide is attached and fixed according to an embodiment of the present invention; FIG.
FIG. 3B is a plan view schematically showing a part of a light guide plate and a cover bottom in which a light guide guide is attached and fixed; FIG.
4 is a perspective view schematically showing a part of a light guide plate, an optical sheet and a cover bottom, to which a light guide guide is attached and fixed according to an embodiment of the present invention.
5 is a cross-sectional view schematically illustrating a portion of FIG. 2 modularized;

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

2 is a perspective view schematically showing a liquid crystal display device according to an embodiment of the present invention.

As shown in the figure, a liquid crystal display according to an embodiment of the present invention includes a liquid crystal panel 110, a backlight unit 120, a guide panel 130, and a cover bottom 150.

For the sake of convenience, the backlight unit 120 is disposed behind the liquid crystal panel 110 under the assumption that the display surface of the liquid crystal panel 110 faces forward, The cover bottom 150 is positioned and integrated with the back surface of the backlight unit 120 in a state where the guide panel 130 of a rectangular shape is wiped.

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

First, the liquid crystal panel 110 plays a key role in image display of a liquid crystal display device. The liquid crystal panel 110 includes a first substrate 112 and a second substrate 114 which are bonded to each other and a liquid crystal layer (Not shown).

Although not shown in the drawings, a plurality of gate lines and data lines cross each other on a first substrate 112 called a lower substrate or an array substrate, pixels are defined, and a thin film transistor film transistors (TFT) are connected in one-to-one correspondence with the transparent pixel electrodes formed in each pixel.

On the inner surface of the second substrate 114 called an upper substrate or a color filter substrate, color filters of red (R), green (G), and blue (B) And a black matrix for covering the gate lines, the data lines, and the thin film transistors.

In addition, color filters of red (R), green (G), and blue (B) colors and transparent common electrodes covering the black matrix are provided.

At this time, an upper and a lower alignment film (not shown) for determining the initial 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 edges of both substrates 112 and 114 to prevent leakage of a liquid crystal layer (not shown) filled between the first and second substrates 112 and 114 .

Polarizing plates 119a and 119b (see FIG. 5) for 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 to the liquid crystal panel 110 via a connection member 116 such as a flexible circuit board or a tape carrier package (TCP) along one edge of the liquid crystal panel 110, And is properly brought into close contact with the side surface of the panel 130 or the back surface of the cover bottom 150.

Accordingly, when the selected thin film transistor for each gate line is turned on by the on / off signal of the thin film transistor which is transferred to the gate line, the liquid crystal panel 110 supplies the image signal of the data line And the alignment direction of the liquid crystal molecules is changed by the electric field between the pixel electrode and the common electrode which is generated thereby, and the difference in transmittance is shown.

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

The backlight unit 120 includes an LED assembly 129 arranged along at least one longitudinal edge of the cover bottom 150, a reflection plate 125, a light guide plate 123 mounted on the reflection plate 125, 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 disposed at one side of the light guide plate 123 so as to face the light incident surface 123a of the light guide plate 123. The LED assembly 129 includes a plurality of LEDs 129a And a PCB 129b on which a plurality of LEDs 129a are mounted at a predetermined interval.

At this time, the plurality of LEDs 129a emit light having red (R), green (G), and blue (B) colors toward the light incoming surface 123a of the light guide plate 123, White light by color mixing can be realized by lighting the LED 129a all at once.

In particular, in recent years, a blue LED 129a including a blue LED chip having excellent luminous efficiency and brightness has been used for improving the luminous efficiency and brightness, and a phosphor such as yttrium aluminum garnet (YAG: Ce) doped with cerium, A blue LED 129a made of a yellow phosphor is used.

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

The light guide plate 123 to which the light emitted from the plurality of LEDs 129a is incident is formed so that the light incident from the LED 129a is uniformly spread over a wide area of the light guide plate 123 while traveling in the light guide plate 123, And provides a surface light source to the liquid crystal panel 110.

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

The light guide plate 123 is made of one selected from a plastic material such as polymethylmethacrylate (PMMA) or polycarbonate (PC), which is an acrylic transparent resin, which is one of transparent materials capable of transmitting light. PMMA is widely used because it has excellent transparency, weatherability and colorability and induces light diffusion when light is transmitted.

The light guide plate 123 includes a light incident surface 123a corresponding to the LED assembly 129a and a light incident surface 123b corresponding to the light incident surface 123a and a light incident surface 123a and a light incident surface 123b, A lower surface 123f facing the surface 123e and the reflection plate 125 and opposite side surfaces 123c and 123d facing each other.

The light guide plate 123 may include a pattern of a specific shape on the lower surface 123f to supply a uniform surface light source. The pattern may be formed in various shapes such as an elliptical pattern, a polygon pattern, a hologram pattern, and the like in order to guide light incident into the light guide plate 123. The pattern is formed on the lower surface of the light guide plate 123 by a printing method or an injection method.

The light incidence surface 123a of the light guide plate 123 corresponding to one edge of the LED assembly 129 is provided with the light incidence surface 123a of the light guide plate 123 along the length direction of the light incidence surface 123a, A stopper 123g for maintaining an optical spacing of the light emitting diodes 129 is provided.

That is, the interval between the LED assembly 129 and the light-incoming surface 123a of the light guide plate 123 is determined by the width of an optical gap or an air gap in the backlight unit 120 The liquid crystal panel 110 is provided with a high-quality surface light source.

Therefore, by providing the stopper 123g on the light incidence surface 123a of the light guide plate 123, the interval between the light incidence surface 123a of the light guide plate 123 and the LED assembly 129 can be kept constant, The light source may be provided to the liquid crystal panel 110.

A light guide plate guide 200 for preventing the light guide plate 123 from flowing through the receiving light surface 123b and both sides 123c and 123d opposite to the light incident surface 123a provided with the stopper 123g is attached and fixed .

The light guide plate guide 200 includes a support 210 attached to the light receiving surface 123b and both sides 123c and 123d of the light guide plate 123 and attached to the light guide plate 123, And an optical sheet fixing part 230 is protruded from the guide part 220. [

In the liquid crystal display device according to the embodiment of the present invention, the position of the light guide plate 123 is substantially fixed in the modular liquid crystal display device through the light guide plate guide 200 to prevent the light guide plate 123 from flowing. It is possible to prevent the problem that the distance between the LED 129a and the light incoming surface 123a of the light guide plate 123 is changed and the light efficiency of the backlight unit 120 is lowered.

In addition, it is possible to prevent the occurrence of foreign objects caused by the flow of the light guide plate 123, and to prevent the problem that the uniform light source can not be realized due to the shrinkage of the light guide plate 123.

It is also possible to prevent occurrence of warping due to expansion of the light guide plate 123 even if the light guide plate 123 is expanded by the heat generated by the driving of the LED assembly 129, Quality can be improved.

In addition, since an assembly gap designed to improve the expansion gap designed in consideration of the expansion of the light guide plate 123 by heat and the assembling property of the light guide plate 123 is not separately required, a liquid crystal display device having a narrow bezel . Let's take a closer look at this later.

The reflection plate 125 is disposed on the back surface of the light guide plate 123 and reflects light passing through the back surface of the light guide plate 123 toward the liquid crystal panel 110 to improve the brightness of light.

The optical sheet 121 on the light guide plate 123 includes a diffusion sheet, at least one light condensing sheet, and the like.

Here, the diffusion sheet is positioned directly above the light guide plate 123, and serves to adjust the direction of light so that the light travels toward the light condensing sheet while dispersing the light incident through the light guide plate 123.

The light diffused through the diffusion sheet is condensed in the direction of the liquid crystal panel 110 by the condensing sheet. Therefore, the light passing through the light condensing sheet is almost perpendicular to the liquid crystal panel 110.

Here, the optical sheet 121 is formed with a protrusion 121a including a fixing hole 121b at the edge thereof. The optical sheet 121 is fixed to the light guide plate 121b by the fixing hole 121b of the protrusion 121a during the modularization process. The optical sheet fixing part 230 of the guide 200 is inserted.

Therefore, the optical sheet 121 becomes fixed in the liquid crystal display without flow.

The liquid crystal panel 110 and the backlight unit 120 are modularized through the guide panel 130 and the cover bottom 150. The cover bottom 150 is formed by mounting the backlight unit 120 including the liquid crystal panel 110 The horizontal surface 151 serves as a lower frame that supports the entire liquid crystal display device and minimizes the occurrence of light loss. The edge of the horizontal surface 151 is bent vertically to cover the side surface 153 of the cover bottom It accomplishes.

At this time, the light guide plate guide 200 is attached and fixed to the light receiving surface 123b and the both side surfaces 123c and 123d of the light guide plate 123, so that the light guide plate 200 is positioned between the side surface 153 of the cover bottom 150 and the light guide plate 123 A guide groove 155 for guiding the flow of the light guide plate guide 200 due to the expansion of the light guide plate 123 is formed on the side surface 153 of the cover bottom 150 corresponding to the light guide plate guide 200 .

On both sides of the guide groove 155, there is provided a guide end 155a that is bent and protruded vertically inwardly from the side surface 153 of the cover bottom 150.

Then, the guide panel 130, which covers the edge of the backlight unit 120, is seated on the cover bottom 150.

The guide panel 130 has a rectangular shape for supporting the edges of the liquid crystal panel 110 and covering the edge of the backlight unit 120 and includes a vertical part 131 and a vertical part 131 surrounding the side surface of the backlight unit 120 And a horizontal portion 133 that is bent perpendicularly inward from the backlight unit 120 to distinguish the positions of the liquid crystal panel 110 and the backlight unit 120 from each other.

The liquid crystal panel 110 is attached and fixed on the horizontal portion 133 through a bonding pad 160 (see Fig. 6) such as a double-sided tape.

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

Here, the liquid crystal display of the present invention omits the top cover (40 in Fig. 1) positioned in front of the liquid crystal panel 110, so that the liquid crystal display device can be made thin and lightweight and simplify the process. Also, the process cost can be reduced.

In addition to being lightweight and thin, the display area is expanded by omitting the top cover (40 in Fig. 1), and at the same time, a bezel area, which is a non-display area other than the display area, is narrowed to have a narrow bezel A liquid crystal display device can be provided.

The liquid crystal display according to the embodiment of the present invention may be constructed such that the light guide plate guide 200 is attached and fixed to the light receiving surface 123b and both sides 123c and 123d of the light guide plate 123, It is possible to minimize the flow of the light guide plate 123 in the modular liquid crystal display device and improve the assemblability of the light guide plate 123 by forming the guide groove 155 that can guide the light guide plate guide 200 to the light guide plate 153 And it is possible to prevent the occurrence of warping due to expansion.

It is possible to prevent the problem that the distance between the LED 129a and the light incoming surface 123a of the light guide plate 123 is changed and the light efficiency of the backlight unit 120 is lowered.

In addition, it is possible to prevent the occurrence of foreign objects due to the flow of the light guide plate 123, thereby preventing the image quality of the liquid crystal panel 110 from deteriorating.

The light incident into the light guide plate 123 due to the shaking of the light guide plate 123 can not be uniformly spread over the wide area of the light guide plate 123, thereby preventing a problem that a uniform surface light source can not be realized.

In addition, it is possible to prevent the warp caused by the expansion of the light guide plate 123, thereby improving the screen display quality of the liquid crystal display device, and the expansion gap, which is designed in consideration of the expansion of the light guide plate 123 by heat, It is possible to provide a liquid crystal display device having a narrow bezel since it is not necessary to separately provide an assembly gap designed to improve the assemblability of the display panel 123. [

Further, the position of the optical sheet 121 positioned above the light guide plate 123 can be fixed through the light guide plate guide 200, thereby preventing deterioration of screen display quality due to the flow of the optical sheet 121 And a separate fixing structure for fixing the position of the optical sheet 121 can be omitted, thereby shortening the process assembly time and the process cost.

In addition, a separate fixing structure for fixing the optical sheet 121 may be omitted to realize a lightweight, thin and narrow bezel.

FIG. 3A is a perspective view schematically showing a part of a cover bottom and a light guide plate attached and fixed according to an embodiment of the present invention, FIG. 3B is a schematic view showing a part of the light guide plate and cover bottom attached and fixed to the light guide guide, Fig.

2) and the light guide plate 123 are sequentially seated on the horizontal surface 151 of the cover bottom 150. At this time, the light incident surface 123b of the light guide plate 123 and the light incident surface 123b of the light guide plate 123, A light guide plate guide 200 is attached and fixed to the light guide plate 123c (123d in Fig. 2).

The light guiding plate guide 200 includes a supporting portion 210 directly attached and fixed to the light receiving surface 123b and both side surfaces 123c and 123d of the light guiding plate 123 and the cover bottom 150 from the supporting portion 210, And a guide part 220 protruding toward the side surface 153 of the cover bottom 150. The guide part 220 is provided with an optical sheet fixing part 230 on the opposite side of the horizontal surface 151 of the cover bottom 150, ) Project upward.

The light guiding plate guide 200 may be integrated with the light guiding plate 123 or may be formed separately from the light guiding plate 200 through the double-side adhesive tape (not shown) And can be attached and fixed to the side surface 123c (123d in Fig. 2).

The side surface 153 of the cover bottom 150 has a guide groove 155 through which the guide portion 220 of the light guide plate guide 200 is inserted.

At this time, guide ends 155a are formed on both sides of the guide groove 155 so as to bend vertically inwardly from the side surface 153 of the cover bottom 150 to guide the guide portion 220 of the light guide plate guide 200 have.

That is, one surface of the support portion 210 of the light guide plate guide 200 is closely attached to the light receiving surface 123b and both sides 123c (123d in FIG. 2) of the light guide plate 123, A guide part 220 is protruded toward the side surface 153 of the cover bottom 150. The guide part 220 is inserted into the guide groove 155 of the cover bottom 150 and positioned.

The guide part 220 includes a pair of guide sides 220a and 220b bent perpendicularly from the other surface of the support part 210 and a guide surface 220c connecting the pair of guide sides 220a and 220b, The guide sides 220a and 220b of the cover bottom 150 face the guide ends 155a of the cover bottom 150 at a predetermined distance in parallel with each other.

An assembly gap is required between the light guide plate 123 and the cover bottom 150 to improve the assembling property of the light guide plate 123 in the process of modularizing the liquid crystal display device. The expansion gap due to the expansion of the light guide plate 123 should be designed in consideration of the case where the light guide plate 123 is expanded by the heat generated from the light guide plate 123.

When the assembly gap and the expansion gap are designed to be wide, the assembling property of the light guide plate 123 and the warping due to the expansion of the light guide plate 123 can be considered. However, since the flow of the light guide plate 123 occurs, And it is impossible to realize a foreign matter due to the shaking of the light guide plate 123 and a uniform surface light source.

In particular, it is impossible to implement a narrow bezel that is recently required.

Therefore, it is necessary to optimize the assembling property of the light guide plate 123 and to minimize the flow of the light guide plate 123 while considering the expansion of the light guide plate 123. However, the liquid crystal display device according to the embodiment of the present invention, It is possible to secure both the assembly gap of the light guide plate 123 and the expansion gap due to the expansion of the light guide plate 123 through the constant spacing distance D between the side face 153 of the bottoms 150 and the light guide plate 123, 123 can be minimized.

The light guide plate 123 according to the embodiment of the present invention is attached and fixed to the light incident side 123b and both sides 123c of the light guide plate 123 , It is desirable to design an assembly gap between the light guide plate guide 200 and the side faces 153 of the cover bottom 150 in order to assure an assembling gap of the light guide plate 123.

Considering the case where the light guide plate 123 is expanded by the heat generated from the LED (129a in FIG. 2), the expansion gap due to the expansion of the light guide plate 123 must be taken into consideration. And between the side surfaces 153 of the cover bottom 150. [

A gap D is formed between the side surface 153 of the cover bottom 150 and the LGP guide 200 in order to design an expansion gap due to the expansion of the LGP 123.

An assembling gap to be designed between the light guide plate guide 200 and the side faces 153 of the cover bottom 150 to improve the assembling property of the light guide plate 123 is formed on the other surface of the support portion 210 of the light guide plate guide 200, Between the side surface 153 of the bottom plate 150 and the guide surface 220c of the guide portion 220 of the light guide plate guide 200 and the side surface 153 of the cover bottom 150, (C) between the guide sides (220a, 220b) of the guide part (220) of the cover body (200) and the guide end (155a) of the cover bottom (150).

Since a gap a between the other surface of the support portion 210 of the light guide plate guide 200 and the side surface 153 of the cover bottom 150 is formed to have a constant spacing distance D from each other due to the expansion gap, .

A guide groove 155 is formed in the side face 153 of the cover bottom 150 and the guide groove 155 is formed in the light guide plate guide (not shown) attached and fixed to both the light receiving surface 123b of the light guide plate 123 and both side surfaces 123c 200 c between the guide sides 220a and 220b of the light guide plate guide 200 and the guide ends 155a of the cover bottom 150 by inserting the guide part 220 of the light guide plate 200 into the guide groove 155 Only an assembly gap is required only between the side surface 153 of the cover bottom 150 and the guide surface 220c of the light guide plate guide 200. Thus,

That is, only the separation distance D is required between the side surface 153 of the cover bottom 150 and the light receiving surface 123b and both sides 123c (123d in FIG. 2) of the light guide plate 123, D both of the mounting gap and the expansion gap in the light receiving surface 123b and both side surfaces 123c (123d in FIG. 2) of the light guide plate 123 are secured.

The light guide plate 123 according to the embodiment of the present invention has the guide surfaces 220a and 220b of the light guide plate guide 200 attached to the light receiving surface 123b of the light guide plate 123, And the guide ends 155a of the guide grooves 155 of the cover bottom 150 are minimized so that the flow in the Y axis direction defined in the drawing is transmitted to both sides 123c of the light guide plate 123 The flow is minimized by the guide sides 220a and 220b of the light guide plate guide 200 attached to the guide grooves 123d of the cover bottom 150 and the guide ends 155a of the guide grooves 155 of the cover bottom 150. [

Therefore, the liquid crystal display according to the embodiment of the present invention attaches and fixes the LGP guide 200 to the light receiving surface 123b and both side surfaces 123c (123d in FIG. 2) of the LGP 123, It is possible to minimize the flow of the light guide plate 123 in the modularized liquid crystal display device and to assemble the light guide plate 123 by forming the guide groove 155 that can guide the light guide plate guide 200 on the side surface 153 of the light guide plate 123. [ And it is possible to prevent the occurrence of warping due to expansion.

This can prevent the problem that the distance between the LED (129a in FIG. 2) and the light-incoming surface (123a in FIG. 2) of the light guide plate 123 changes and the light efficiency of the backlight unit (120 in FIG. 2) .

In addition, it is possible to prevent the occurrence of foreign objects due to the flow of the light guide plate 123, thereby preventing the image quality of the liquid crystal panel 110 (FIG. 2) from being lowered.

The light incident into the light guide plate 123 due to the shaking of the light guide plate 123 can not be uniformly spread over the wide area of the light guide plate 123, thereby preventing a problem that a uniform surface light source can not be realized.

In addition, it is possible to prevent the warp caused by the expansion of the light guide plate 123, thereby improving the screen display quality of the liquid crystal display device, and the expansion gap, which is designed in consideration of the expansion of the light guide plate 123 by heat, It is possible to provide a liquid crystal display device having a narrow bezel since it is not necessary to separately provide an assembly gap designed to improve the assemblability of the display panel 123. [

In addition, the liquid crystal display according to the embodiment of the present invention can fix the position of the optical sheet (121 in FIG. 2) positioned above the light guide plate 123 through the light guide plate guide 200, see FIG. 4 Let's take a closer look.

4 is a perspective view schematically showing a part of a light guide plate, an optical sheet and a cover bottom, to which a light guide plate guide according to an embodiment of the present invention is attached and fixed.

2, the light guide plate 123 and the optical sheet 121 are sequentially seated on the horizontal surface (151 in FIG. 3B) of the cover bottom (150 in FIG. 3B) A light guide plate guide 200 is attached and fixed to the light receiving surface 123b and both sides (123c, 123d in FIG. 2) of the light guide plate 123.

At this time, the guide portion 220 of the light guide plate guide 200 is provided with the optical sheet fixing portion 230 protruding upward from the horizontal surface (151 of FIG. 3B) of the cover bottom (150 of FIG. 3B) A protrusion 121a including a fixing hole 121b is protruded along the edge of the optical sheet 121. The optical sheet fixing portion 230 is fixed to the fixing hole 121b formed in the protrusion 121a of the optical sheet 121 Is inserted.

Thereby, the optical sheet 121 becomes fixed in the liquid crystal display without flowing.

That is, the LGP guide 200 according to the embodiment of the present invention can secure the assembly gap and the expansion gap of the LGP 123, minimize the flow of the LGP 123, fix the LGP to the optical sheet 121 .

Accordingly, it is possible to prevent the screen display quality from being deteriorated due to the flow of the optical sheet 121, and to omit a separate fixing structure for fixing the position of the optical sheet 121, The process cost can be lowered.

In addition, a separate fixing structure for fixing the optical sheet 121 may be omitted to realize a lightweight, thin and narrow bezel.

Fig. 5 is a cross-sectional view schematically showing a part of Fig. 2 modularized.

An LED assembly 129 including a reflection plate 125, a light guide plate 123, a PCB 129b on which the LED 129a and the LED 129a are mounted, and a light guide plate 123 on the light guide plate 123, 121 are stacked to form a backlight unit 120. [

A liquid crystal panel 110 in which a liquid crystal layer (not shown) is interposed between the first and second substrates 112 and 114 and the first and second substrates 112 and 114 are disposed on the backlight unit 120, And 114 are attached with polarizing plates 119a and 119b selectively transmitting only specific light.

The backlight unit 120 and the liquid crystal panel 110 are surrounded by the guide panel 130, and the cover bottom 150 is coupled to the rear surface thereof to be modularized.

Here, the liquid crystal panel 110 is attached and fixed on the horizontal portion 133 of the guide panel 130 while supporting the back edge thereof through a bonding pad 160 such as a double-sided tape.

The liquid crystal display according to an embodiment of the present invention includes a light guide plate 200 attached to and fixed to a light receiving surface 123b of a light guide plate 123 and a cover bulb 150 corresponding to the light guide plate guide 200 A guide groove 155 for guiding the flow of the light guide plate guide 200 is formed on the side surface 153.

The light guiding plate guide 200 includes a supporting portion 210 attached to and fixed to the light receiving surface 123b of the light guide plate 123 and a guide protruding from the supporting portion 210 toward the side surface 153 of the cover bottom 150 And the guide part 220 is inserted into the guide groove 155 of the cover bottom 150.

Accordingly, when the light guide plate 123 expands due to heat generated by driving the LED assembly 129 in the process of implementing an image in the liquid crystal display device, the light guide plate 123 expands in the X-axis direction defined in the drawing, It is possible to prevent the occurrence of warping due to expansion.

The optical sheet fixing part 230 protruding upward from the guide part 220 of the light guide plate guide 200 is inserted into the fixing hole 121b formed in the protruding part 121a of the optical sheet 121, It is possible to prevent the sheet 121 from flowing.

At this time, the protrusion 135 is provided below the horizontal portion 133 of the guide panel 130 so that the protrusion 135 presses the guide portion 220 of the light guide plate guide 200, 123 can be prevented from flowing in the Z-axis direction defined by the drawing.

The liquid crystal display according to the embodiment of the present invention may be configured such that the light guide plate guide 200 is attached and fixed to the light incident side 123b and both sides 123c and 123d of the light guide plate 123, It is possible to minimize the flow of the light guide plate 123 in the modularized liquid crystal display device and to assemble the light guide plate 123 by forming the guide groove 155 that can guide the light guide plate guide 200 on the side surface 153 of the light guide plate 123. [ And it is possible to prevent the occurrence of warping due to expansion.

It is possible to prevent the problem that the distance between the LED 129a and the light incoming surface 123a of the light guide plate 123 is changed and the light efficiency of the backlight unit 120 is lowered.

In addition, it is possible to prevent foreign materials from being generated due to the flow of the light guide plate 123, and to prevent the image quality of the liquid crystal panel 110 from deteriorating due to foreign substances.

The light incident into the light guide plate 123 due to the shaking of the light guide plate 123 can not be uniformly spread over the wide area of the light guide plate 123, thereby preventing a problem that a uniform surface light source can not be realized.

In addition, it is possible to prevent the warp caused by the expansion of the light guide plate 123, thereby improving the screen display quality of the liquid crystal display device, and the expansion gap, which is designed in consideration of the expansion of the light guide plate 123 by heat, It is possible to provide a liquid crystal display device having a narrow bezel since it is not necessary to separately provide an assembly gap designed to improve the assemblability of the display panel 123. [

Further, the position of the optical sheet 121 positioned above the light guide plate 123 can be fixed through the light guide plate guide 200, thereby preventing deterioration of screen display quality due to the flow of the optical sheet 121 And a separate fixing structure for fixing the position of the optical sheet 121 can be omitted, thereby shortening the process assembly time and the process cost.

In addition, a separate fixing structure for fixing the optical sheet 121 may be omitted to realize a lightweight, thin and narrow bezel.

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

123: light guide plate (123b: incoming light surface)
153: Side of the cover bottom
155: guide groove (155a: guide end)
200: guide plate guide 210: support part 220: guide parts 220a and 220b: guide side 220c: guide surface 230: optical sheet fixing part)

Claims (7)

An LED assembly;
A light guide plate including a light incident surface corresponding to the LED assembly, a light incident surface on the opposite side of the light incident surface, and both side surfaces connecting the light incident surface and the light incident surface;
A light guiding plate guide including a supporting portion attached to the carrying light surface and both side surfaces of the light guide plate, and a guide portion projecting outward from the supporting portion;
A liquid crystal panel seated on the optical sheet;
The light guide plate includes a horizontal surface on which the light guide plate is mounted and a side surface that is vertically bent from the horizontal surface,
And the liquid crystal display device.
The method according to claim 1,
And a guide end protruding from both sides of the guide groove so as to be perpendicularly bent inward from the side surface.
The method according to claim 1,
Wherein the gap between the side surface of the cover bottom and the support portion of the guide of the light guide has a spacing in a state that the light guide plate is not inflated.
The method according to claim 1,
And the optical sheet fixing portion protrudes upward from the guide portion.
The method of claim 3,
An optical sheet is seated on an upper portion of the light guide plate,
Wherein a protruding portion including a fixing hole is formed along the edge of the optical sheet, and the optical sheet fixing portion is inserted into the fixing hole.
The method according to claim 1,
A liquid crystal display panel having a protrusion protruding from the bottom of the horizontal portion of the guide panel, the protrusion protruding from the bottom of the horizontal portion of the guide panel, the guide panel including a vertical portion covering an edge of the backlight unit and a horizontal portion supporting a back edge of the liquid crystal panel, Device. The method according to claim 1,
And a reflective plate positioned below the light guide plate.

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