KR20180013555A - Liquid crystal display device - Google Patents

Abstract

A liquid crystal display device of a narrow bezel model of the present invention applies an insertion structure and a mounting structure of an optical sheet on left and right sides, and simultaneously fixes the optical sheets by using an LED housing on a lower side. The liquid crystal display device can remove a fixing pad for an existing optical sheet, thereby reducing costs and defects and mitigating cleft of the optical sheet due to vibration. The liquid crystal display device comprises: a backlight unit located on the back surface of a liquid crystal panel, and including at least one optical sheet; a guide panel surrounding the side surface of the backlight unit, and including a groove into which a first protrusion of the optical sheet is inserted and a mounting part in which a second protrusion of the optical sheet is mounted; and a lower cover receiving and fixing the liquid crystal panel, the guide panel and the backlight unit.

Description

[0001] LIQUID CRYSTAL DISPLAY DEVICE [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display, and more particularly, to a liquid crystal display capable of implementing a narrow bezel.

In recent information society, the importance of display devices as visual information delivery media is getting more emphasized, and in order to take a major position in the future, it is necessary to meet requirements such as low power consumption, thinning, light weight, and high image quality.

The display device includes a cathode ray tube (CRT), an electroluminescence (EL), a light emitting diode (LED), a vacuum fluorescent display (VFD) A non-light emitting type in which light can not be emitted, such as a light emitting type such as a field emission display (FED), a plasma display panel (PDP), and a liquid crystal display (LCD) .

2. Description of the Related Art A liquid crystal display device is an apparatus that expresses an image using optical anisotropy of a liquid crystal. The liquid crystal display device is superior in visibility to conventional CRTs and has a smaller average heat dissipation than CRTs of the same screen size, and also has a small amount of heat dissipation.

Hereinafter, a general liquid crystal display device will be described.

1 is an exploded perspective view schematically showing a structure of a general liquid crystal display device.

2 is a schematic cross-sectional view taken along the line D-D 'of the general LCD shown in FIG.

1 and 2, a general liquid crystal display device includes a liquid crystal panel 10 in which pixels are arranged in a matrix form to output an image, a backlight unit 40 provided on the rear surface of the liquid crystal panel 10, A guide panel 45 for housing the liquid crystal panel 10 and the backlight unit 40, and a lower cover 50.

The liquid crystal panel 10 includes a color filter substrate 5 and a color filter substrate 5 which are attached to each other so as to maintain a uniform cell gap so as to face each other. And a liquid crystal layer (not shown) formed on the substrate.

Although not shown, upper and lower polarizers are attached to the outside of the liquid crystal panel 10, respectively. At this time, the lower polarizer polarizes light passing through the backlight unit 40 and the upper polarizer passes through the liquid crystal panel 10 Polarizes the light.

A light emitting diode (LED) assembly 30 for generating light is provided on one side of a light guide plate 42. The light guide plate 42 includes a light emitting diode And a reflection plate 41 is provided on the back surface.

The LED assembly 30 includes an LED package 31 and an LED printed circuit board (PCB) 32 for driving the LED package 31.

The light emitted from the LED package 31 is incident on the side surface of the light guide plate 42 of transparent material and the reflection plate 41 disposed on the back surface of the light guide plate 42 reflects light transmitted through the back surface of the light guide plate 42 to the light guide plate 42 To the optical sheets 43 on the upper surface, thereby reducing the loss of light and improving the uniformity.

A liquid crystal panel 10 composed of a color filter substrate 5 and an array substrate 15 is seated on the upper part of the backlight unit 40 having such a structure through a guide panel 45 and a double- And the lower cover 50 are combined to constitute a liquid crystal display device.

At this time, in recent years, from the viewpoints of downsizing and weight reduction of the liquid crystal display device and improvement of the design, the needs for a liquid crystal display device with a narrow bezel structure have been increased.

A fixing pad 56 is used on both sides of the liquid crystal panel 10 in order to fix the optical sheets 43. In this case, There is a problem in that defects are generated.

That is, three optical sheets 43 are stacked in this order on the light guide plate 42, and the fixing pads 56 are attached on the protruding portions of the optical sheets 43 protruding from both sides to fix the optical sheets 43 . At this time, the fixing pad 56 is made of PET (polyethylene terephthalate), and a double-sided tape is attached to the back surface thereof to fix the optical sheets 43. In this case, the use of at least three fixing pads 56 consumes a cost, and a cost of air is generated when the fixing pad 56 is attached, thereby increasing the total cost. Further, as the width of the fixing pad 56 is limited due to the demand for development of an increasingly narrow bezel, a phenomenon occurs in which the fixing pad 56 climbs the optical sheets 43 at the time of adhering, There arises a problem of cracking of the substrate 10.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a liquid crystal display device capable of fixing optical sheets without using a conventional fixing pad in a low-bezel model.

Other objects and features of the present invention will be described in the following description of the invention and the claims.

According to an aspect of the present invention, there is provided a liquid crystal display device including: a backlight unit disposed on a rear surface of a liquid crystal panel and including at least one optical sheet; And a guide panel having a groove into which the first projection of the sheet is inserted and a seating portion on which the second projection of the optical sheet is seated.

In this case, the liquid crystal display device according to an embodiment of the present invention may further include a lower cover for receiving and fixing the liquid crystal panel, the guide panel, and the backlight unit.

The first projection may protrude from one side of the optical sheet toward the groove, and the second projection may protrude from the other side of the optical sheet toward the seat.

When the backlight unit includes a plurality of the optical sheets, the optical sheet may further include a third protrusion protruding from a different position below the light source of the backlight unit.

At this time, the third projection may be attached to the LED housing through an adhesive means.

At least one groove may be formed on one side of the guide panel to insert the first projection.

At this time, the groove may have a predetermined inclination at a lower portion where the first protrusions abut so that the first protrusions are inserted smoothly.

At this time, the groove may have a slope in the lower portion in a direction in which the width of the groove widens toward the side portion of the lower cover.

The seating part may be provided on the other side of the guide panel, and the second projection may be placed thereon.

At this time, a predetermined region of the other side portion may be removed so that the second projection is placed on the seating portion.

The guide panel may include a lower portion surrounding the lower side of the backlight unit where the light entrance portion of the light guide plate is located, a side portion surrounding the left and right sides of the backlight unit, and an upper portion surrounding the upper side of the backlight unit.

At this time, the upper and side portions of the guide panel can be attached and fixed on the bottom portion of the lower cover through the adhesive means.

The lower portion of the guide panel may have a central portion removed by a predetermined length so that both side portions may be divided.

As described above, the liquid crystal display device according to an embodiment of the present invention can remove the conventional fixing pad for an optical sheet, thereby reducing cost and defects.

Further, the present invention provides an effect of improving flexibility of the optical sheets due to vibration, and at the same time, giving a degree of freedom to the bezel design of the narrow bezel model by eliminating the fixing pads having a predetermined width.

1 is an exploded perspective view schematically showing a structure of a general liquid crystal display device.
2 is a schematic cross-sectional view taken along the line D-D 'of the general LCD shown in FIG. 1;
3 is an exploded perspective view schematically illustrating a structure of a liquid crystal display device according to an embodiment of the present invention.
4 is a plan view schematically showing a liquid crystal display according to an embodiment of the present invention.
FIG. 5 is a plan view showing the structure of a guide panel in the liquid crystal display according to the embodiment of the present invention shown in FIG. 4;
6A and 6B are enlarged views of part A of the liquid crystal display according to the embodiment of the present invention shown in FIG.
FIG. 7A and FIG. 7B are enlarged views of a portion B in the liquid crystal display according to the embodiment of the present invention shown in FIG.
8A and 8B are enlarged views of a portion C in a liquid crystal display according to an embodiment of the present invention shown in FIG.

Hereinafter, preferred embodiments of the liquid crystal display according to the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. It should be understood, however, that the invention is not limited to the disclosed embodiments, but is capable of many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification. The dimensions and relative sizes of the layers and regions in the figures may be exaggerated for clarity of illustration.

It will be understood that when an element or layer is referred to as being another element or "on" or "on ", it includes both intervening layers or other elements in the middle, do. On the other hand, when a device is referred to as "directly on" or "directly above ", it does not intervene another device or layer in the middle.

The terms spatially relative, "below," "lower," "above," "upper," and the like, And may be used to easily describe the correlation with other elements or components. Spatially relative terms should be understood to include, in addition to the directions shown in the drawings, terms that include the different directions of the elements in use, or in operation. For example, when inverting an element shown in the figures, an element described as "below" or "beneath" of another element may be placed "above" another element. Thus, the exemplary term "below" can include both downward and upward directions.

The terminology used herein is for the purpose of describing embodiments only and is not intended to be limiting of the invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. &Quot; comprise "and / or" comprising ", as used in the specification, means that the presence of stated elements, Or additions.

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

4 is a plan view schematically showing a liquid crystal display according to an embodiment of the present invention. 4 illustrates an example of a structure of a liquid crystal display device in which an upper surface of an optical sheet is exposed before a liquid crystal panel is seated.

5 is a plan view showing the structure of the guide panel in the liquid crystal display according to the embodiment of the present invention shown in FIG.

3 to 5, a liquid crystal display according to an exemplary embodiment of the present invention mainly includes a liquid crystal panel 110, a backlight unit 140 for supplying light to the liquid crystal panel 110, and a backlight unit 140 And a lower cover 150 for receiving and fixing the lower cover 150.

The liquid crystal panel 110 outputs pixels by arranging the pixels in a matrix form.

The backlight unit 140 may be disposed on the back surface of the liquid crystal panel 110 to emit light over the entire surface of the liquid crystal panel 110. At this time, although the rear surface and the front surface of the liquid crystal panel 110 can be viewed as relative positions, the liquid crystal panel 110 will be described with reference to the top view.

The liquid crystal panel 110 and the backlight unit 140 may be received and fixed by the guide panel 145 and the lower cover 150.

The liquid crystal panel 110 includes a color filter substrate 105 and a color filter substrate 105 bonded to each other so as to maintain a uniform cell gap so as to face each other and a cell gap 115 between the array substrate 115 and the color filter substrate 105 and the array substrate 115 And a liquid crystal layer (not shown) formed on the substrate.

Although not shown, a common electrode and a pixel electrode are formed on the liquid crystal panel 110 in which the color filter substrate 105 and the array substrate 115 are bonded together to apply an electric field to the liquid crystal layer. The voltage of the data signal applied to the pixel electrode is controlled in the state where the voltage is applied to the common electrode. Then, the liquid crystal of the liquid crystal layer rotates by the dielectric anisotropy according to the electric field between the common electrode and the pixel electrode, so that light or an image can be displayed by transmitting or blocking light for each pixel.

At this time, a switching element such as a thin film transistor (TFT) may be separately provided in the pixels to control the voltage of the data signal applied to the pixel electrode on a pixel-by-pixel basis.

That is, a gate line and a data line are vertically and horizontally arranged on the array substrate 115 to define a pixel region, and a thin film transistor, which is a switching device, may be formed in a crossing region between the gate line and the data line.

The thin film transistor may include a gate electrode connected to the gate line, a source electrode connected to the data line, and a drain electrode connected to the pixel electrode.

The color filter substrate 105 may comprise a color filter consisting of a plurality of sub-color filters embodying red, green and blue and a black matrix separating between sub-color filters and blocking light transmitting through the liquid crystal layer . The color filter substrate 105 may include a color filter and an overcoat layer formed on the black matrix.

A polarizing plate may be attached to the outside of the color filter substrate 105 and the array substrate 115, respectively. At this time, the lower polarizer polarizes the light transmitted through the backlight unit 140, and the upper polarizer polarizes the light transmitted through the liquid crystal panel 110.

The lower cover 150 may include a bottom portion 150a and a plurality of side portions 150b.

The bottom portion 150a may have a rectangular shape. The side portions 150b may extend vertically to have a predetermined height from the respective edges of the bottom portion 150a.

The edges of the side portions 150b adjacent to each other can be connected to each other. The space enclosed by the side portions 150b and the bottom portion 150a can form a storage space in which the liquid crystal panel 110 and the backlight unit 140 are housed.

However, the present invention is not limited to the structure of the lower cover 150 described above.

The guide panel 145 has a rectangular frame shape with one side cut off and may be surrounded by a bottom portion 150a and side portions 150b of the bottom cover 150. [

The guide panel 145 according to the embodiment of the present invention can serve not only to support the liquid crystal panel 110 but also to fix and seat the optical sheets 143 on the left and right sides.

That is, the guide panel 145 has a rectangular shape for housing the liquid crystal panel 110 and for covering the edge of the backlight unit 140, and includes an upper portion 145a for covering the upper side of the backlight unit 140, The lower portion 145c of the guide panel 145 may include a side portion 145b 'and 145b' surrounding the left and right sides of the backlight unit 140 and a lower portion 145c surrounding the lower side of the backlight unit 140. At this time, The upper side and the left side, the right side, and the lower side of the backlight unit 140 may be viewed as relative positions, but as described above, The lower side of the backlight unit 140 refers to the side where the light incoming portion of the light guide plate 142 is located, The light-incoming portion of the light guide plate 142 is positioned at the upper, left, It means the remaining three sides that do not.

The configuration of the upper portion 145a, the side portions 145b ', 145b ", and the lower portion 145c of the guide panel 145 will be described later in detail.

The liquid crystal panel 110 can be attached and fixed on the guide panel 145 through an adhesive means (not shown) such as double-sided tape. At this time, the guide panel 145 may have a predetermined step on which the adhesive means is placed, but the present invention is not limited thereto. The guide panel 145 may also be attached and secured onto the bottom portion 150a of the lower cover 150 through another adhesive means (not shown) such as a double-sided tape.

A liquid crystal display device according to an embodiment of the present invention has a structure in which a top case is omitted, so that the liquid crystal display device can be lightweight and thin, and the process can be simplified. In addition, the top case is made of a metal material, and the process cost can be reduced due to the elimination thereof.

Next, the backlight unit 140 will be described in detail. An LED assembly 130 including a light source for generating light can be installed on one side of the light guide plate 142. A reflection plate 141 may be provided on the back surface of the light guide plate 142.

A plurality of optical sheets 143 may be disposed on the upper surface of the light guide plate 142 to improve the efficiency of light emitted from the light guide plate 142 and illuminate the liquid crystal panel 110.

However, the present invention is not limited to the structure of the above-described backlight unit 140, and any backlight unit 140 having any structure can be applied to the liquid crystal display device according to the present invention.

The light guide plate 142 receives light from the light source and guides the light to the liquid crystal panel 110 side. At this time, the light provided from the light source may be provided as a light entrance portion of the light guide plate 142. The light-incident portion faces the LED assembly 130 installed on the lower side of the liquid crystal panel 110. Here, the lower side of the liquid crystal panel 110 refers to the side where the lower portion 145c of the guide panel 145 is divided.

That is, when the light guiding plate 142 is referred to as a light-incident portion, the surface facing the LED assembly 130 may be referred to as a light-incident portion. The light-incoming portion of the light guide plate 142 faces the light exit surface of the light source.

The light guide plate 142 may include a pattern of a specific shape on the bottom surface to supply a uniform surface light source. The pattern may be formed in various shapes such as an elliptical pattern, a polygonal pattern, and a hologram pattern in order to guide light incident into the light guide plate 142. The pattern can be formed on the lower surface of the light guide plate 142 by a printing method or an injection method.

The light guide plate 142 may be made of PMMA (polymethyl methacrylate) or PC (polycarbonate) plastic.

Next, the light source is a means for emitting light. For example, a cold cathode fluorescent lamp (CCFL), a hot cathode fluorescent lamp (HCFL), an external electroluminescence lamp (EEFL) But is not limited thereto. Hereinafter, for convenience of explanation, a case where an LED is used as a light source is taken as an example.

The LED assembly 130 may include a LED printed circuit board (PCB) 132 and an LED housing (not shown) for driving the LED package 131 and the LED package 131 .

The LED package 131 may comprise a light emitting package having at least one LED.

The LED package 131 may be installed on the LED printed circuit board 131 such that the light emitting surface faces the light incoming portion of the light guide plate 142. That is, the LED package may be arranged along at least one side surface in the longitudinal direction of the liquid crystal panel 110.

The LED printed circuit board 131 may be positioned between the light entrance portion of the light guide plate 142 and the bottom portion 150a of the lower cover 150. [

A plurality of power lines (not shown) and electrical components (not shown) may be formed on the LED printed circuit board 131 to transmit power to the light sources.

The light source is connected to an inverter (not shown) to receive power and emit light.

The light emitted from the light source is incident on the side surface of the light guide plate 142 made of a transparent material. The reflective sheet 141 disposed on the back surface of the light guide plate 142 reflects the light transmitted to the back surface of the light guide plate 142 toward the optical sheets 143 on the upper surface of the light guide plate 142 to reduce light loss, Can be improved.

At this time, the optical sheets 143 include a diffuser sheet and an upper and a lower prism sheet, and a protective sheet may be added. As described above, the optical sheet 143 is formed of three sheets in the embodiment of the present invention. However, the present invention is not limited thereto. The optical sheets 143 may be formed of one sheet, two sheets, or a plurality of sheets.

The prism sheet condenses light from the light guide plate 142, and the diffusion sheet can diffuse the light from the prism sheet. And, the protective sheet can serve to protect these prism sheets and the diffusion sheet. Light passing through the protective sheet may be provided to the liquid crystal panel 110 side.

The optical sheet 143 has a first projection projecting from the left side, a second projection projecting from the right side, and a third projection projecting from the lower side, and the third projection has a plurality of optical sheets 143 And protruding from different positions.

The liquid crystal panel 110 including the color filter substrate 105 and the array substrate 115 is mounted on the upper part of the backlight unit 140 having the above structure through the guide panel 145 and the lower cover 150 is coupled Thereby constituting a liquid crystal display device.

At this time, in the low-bezel model of the liquid crystal display device according to the embodiment of the present invention, the optical sheet insertion structure and the seating structure are applied to the left and right sides of the guide panel 145, (143) are fixed. In this case, a conventional fixing pad for an optical sheet can be removed, which can reduce costs and defects, and can improve the separation of the optical sheets 143 due to vibration. Explain.

6A and 6B are enlarged views of a portion A of the liquid crystal display according to the embodiment of the present invention shown in FIG. Here, FIG. 6B is a perspective view schematically showing a cross section taken along line A-A 'of the liquid crystal display device according to the embodiment of the present invention shown in FIG. 6A.

6A and 6B illustrate a case where the optical sheet insertion structure is applied to the left side of the liquid crystal display device, but the present invention is not limited thereto. The optical sheet insertion structure according to the embodiment of the present invention may be applied to the right side of the liquid crystal display device.

6A and 6B, a predetermined groove H is formed in the left side portion 145b 'of the guide panel 145 and the first projection 143a of the optical sheets 143 is provided in the groove H, Can be inserted and fixed.

The groove H of the guide panel 145 has a space enough to allow the first projection 143a of the optical sheets 143 to be inserted and may be formed on the left side portion 145b ' In FIG. 4, two grooves H of the guide panel 145 are formed on the left side portion 145b '. However, the present invention is not limited thereto.

The grooves H of the guide panel 145 may have a predetermined slope at the bottom so that the first projections 143a of the optical sheets 143 are smoothly inserted. At this time, the groove H of the guide panel 145 may be inclined downward in the direction in which the width of the groove H becomes wider toward the side portion 150b of the lower cover 150. [ The groove H of the guide panel 145 becomes narrower as it goes inward to press the first projection 143a of the optical sheets 143 inserted in the groove H , The first protrusion 143a of the optical sheets 143 inserted in the groove H may not be easily detached.

The first protrusion 143a of the optical sheets 143 may be formed on the left side of the optical sheets 143 so as to protrude toward the grooves H of the guide panel 145, May be formed at the same position.

Next, FIGS. 7A and 7B are enlarged views of a portion B in the liquid crystal display according to the embodiment of the present invention shown in FIG. 7B is a perspective view schematically showing a cross section taken along the line B-B 'of the liquid crystal display device according to the embodiment of the present invention shown in FIG. 7A.

7A and 7B illustrate the case where the optical seat seating structure is applied to the right side of the liquid crystal display device, but the present invention is not limited thereto. The optical seat seating structure according to the embodiment of the present invention may be applied to the left side of the liquid crystal display device.

7A and 7B, a predetermined seating portion 146 is formed on the right side portion 145b "of the guide panel 145. A second projection 146 of the optical sheets 143 143b can be placed and seated.

The second projection 143b of the optical sheets 143 placed on the seating portion 146 can be pressed and fixed by the liquid crystal panel 110 which is seated on the second projection 143b.

A predetermined area of the right side portion 145b "is removed so that the second projection 143b of the optical sheets 143 is put on the seating portion 146 of the guide panel 145, and one or more . 4 shows an example in which one seating portion 146 of the guide panel 145 is formed on the right side portion 145b ", but the present invention is not limited thereto.

The second protrusion 143b of the optical sheets 143 may be formed on the right side of the optical sheets 143 so as to protrude toward the seating portion 146 of the guide panel 145, All of which may be formed at the same position.

7A, 7B and 8A and 8B, the guide panel 145 is surrounded by the bottom portion 150a and the side portions 150b of the lower cover 150, as described above, And may be attached to the cover 150.

That is, the guide panel 145 according to the embodiment of the present invention has a rectangular frame shape for accommodating the liquid crystal panel 110 and covering the edge of the backlight unit 140, Side portions 145b 'and 145b' surrounding the left and right sides of the backlight unit 140 and a lower portion (not shown) surrounding the lower sides of the backlight unit 140. [

The upper and side portions 145b 'and 145b' 'of the guide panel 145 may be attached and fixed on the bottom portion 150a of the lower cover 150 through another adhesive means 157 such as a double-sided tape.

As described above, according to the liquid crystal display apparatus according to the embodiment of the present invention, the fixing pad for the optical sheet can be removed by applying the optical sheet insertion structure and the seating structure to the left and right sides of the guide panel 145, It provides an effect that can be done. That is, in the liquid crystal display device according to the embodiment of the present invention, it is possible to improve defects such as cracks and the cost of the liquid crystal panel due to adhesion failure of the fixing pad by eliminating the fixing pad assembly process.

Further, the elimination of the fixed pad having a predetermined width provides an effect of giving a degree of freedom to the bezel design of the narrow bezel model.

Next, FIGS. 8A and 8B are enlarged views of a portion C of the liquid crystal display according to the embodiment of the present invention shown in FIG. 8B is a perspective view schematically showing a cross section taken along the line C-C 'of the liquid crystal display device according to the embodiment of the present invention shown in FIG. 8A.

8A and 8B illustrate a case where the optical sheets are fixed using the LED housing on the lower side of the liquid crystal display device.

8A and 8B, the lower portion 145c of the guide panel 145 surrounds the lower side of the backlight unit 140, and the center portion is removed by a predetermined length so that both side portions can be divided. However, the present invention is not limited thereto.

Particularly, the lower portion 145c of the guide panel 145 according to the embodiment of the present invention is placed on the light entrance portion of the light guide plate 1420 and the LED assembly 130, and one portion of the guide panel 145 is bended twice, And can be overlapped.

At this time, the lower end 145c of the guide panel 145 may extend toward the third projections 143c ', 143c' ', 143c' '' of the optical sheets 143. Further, it may be installed to maintain a certain distance from the third projections 143c ', 143c' ', 143c' '' of the optical sheets 143.

As described above, the LED assembly 130 may include an LED package 131, an LED printed circuit board 132 for driving the LED package 131, and an LED housing 132.

The LED package 131 may comprise a light emitting package having at least one LED. The light emitting package may be a light emitting package having different colors, for example, a red light emitting diode, a green light emitting diode, and a blue light emitting diode.

For example, in recent years, a blue LED including a blue LED chip having excellent luminous efficiency and luminance has been used for improving the luminous efficiency and brightness, and a 'yttrium aluminum garnet doped with cerium', that is, a yellow phosphor Can be used. The blue light emitted from the LED is transmitted through the phosphor and mixed with the yellow light emitted by the phosphor, thereby realizing the white light.

The LED package 131 may be installed on the LED printed circuit board 131 such that the light emitting surface faces the light incoming portion of the light guide plate 142. That is, the LED package may be arranged along at least one side surface in the longitudinal direction of the liquid crystal panel 110.

The LED printed circuit board 131 may be positioned between the light entrance portion of the light guide plate 142 and the bottom portion 150a of the lower cover 150. [

The LED printed circuit board 131 may be a general printed circuit board (PCB) or a metal printed circuit board. Although not shown, the metal printed circuit board may be formed of a base layer made of aluminum or a copper alloy, and a conductor pattern formed on the thermally conductive resin layer and the thermally conductive resin layer formed on the base layer. These conductor patterns include the power supply lines described above. A metal printed circuit board is called a heat-dissipating metal board and has excellent heat dissipation properties and excellent mechanical strength.

An LED housing 133 may be installed on the LED package 131 facing the LED printed circuit board 131. At this time, the LED housing 133 may extend from the upper portion of the LED package 131 to the upper portion of the light-incoming portion to partially overlap the light-incoming portion of the light guide plate 142.

If there is a difference in thickness between the LED package 131 and the light-incoming portion of the light guide plate 142, the LED housing 133 may be bent to have a predetermined step. The end of the LED housing 133 may be installed so as to maintain a certain distance from the optical sheets 143 while looking at the optical sheets 143.

At this time, another adhesive means 158 such as a tape is provided on the LED housing 133 so that the third protrusions 143c ', 143c' ', 143c' '' of the optical sheets 143 can be attached.

At this time, the third projections 143c ', 143c', 143c '' 'of the optical sheets 143 may be formed on the lower side of the optical sheets 143 so as to protrude toward the lower portion 145c of the guide panel 145, And may be formed so as to protrude at different positions with respect to the plurality of optical sheets 143.

The third protrusions 143c ', 143c', and 143c '' of the optical sheets 143 protrude from different positions and are attached to another bonding means 158 at the lower portion thereof, It can be restrained.

By thus forming the third projections 143c ', 143c', 143c '' 'below the optical sheets 143 and fixing all the optical sheets 143 to the LED housing 133, the number of fixing operations can be reduced . In addition, as all of the third projections 143c ', 143c', 143c '' 'of the optical sheets 143 are constrained, the relative movement of the optical sheets 143 between vibrations is reduced, Effect can be obtained. For example, as a result of the vibration test of 3.5 G, the optical sheets 143 are broken in the case of the conventional fixing pad structure, but the optical sheets 143 are not broken in the present invention.

While a great many are described in the foregoing description, it should be construed as an example of preferred embodiments rather than limiting the scope of the invention. Therefore, the invention should not be construed as limited to the embodiments described, but should be determined by equivalents to the appended claims and the claims.

110: liquid crystal panel 140: backlight unit
141: reflector 142: light guide plate
143: Optical sheets 143a, 143b, 143c ', 143c ", 143c'":
145: guide panel 145a:
145b ', 145b'': side 145c:
146: seat part 150: bottom cover
H: Home

Claims (12)

A backlight unit located on the back surface of the liquid crystal panel and including at least one optical sheet;
A guide panel which surrounds the side surface of the backlight unit and has a groove into which the first projection of the optical sheet is inserted and a seat on which the second projection of the optical sheet is seated; And
And a lower cover for receiving and fixing the liquid crystal panel, the guide panel, and the backlight unit. The liquid crystal display of claim 1, wherein the first projection projects from the one side of the optical sheet toward the groove, and the second projection projects from the other side of the optical sheet toward the seating part. The backlight unit according to any one of claims 1 and 2, wherein when the backlight unit includes a plurality of the optical sheets, the optical sheet includes a plurality of optical sheets, 3 protrusions. The liquid crystal display according to claim 3, wherein the third projection is attached to the LED housing through an adhesive means. The liquid crystal display of claim 2, wherein at least one groove is provided on one side of the guide panel to insert the first projection. 6. The liquid crystal display of claim 5, wherein the groove has a predetermined inclination at a lower portion where the first projections abut so that the first projections are smoothly inserted. 7. The liquid crystal display of claim 6, wherein the groove has a slope in the lower portion in a direction in which the width of the groove widens toward the side portion of the lower cover. 3. The liquid crystal display of claim 2, wherein the seating part is provided on the other side of the guide panel and the second projection is placed thereon. The liquid crystal display of claim 8, wherein a predetermined area of the other side portion is removed so that the second projection is placed on the seating portion. The apparatus according to claim 1,
A lower portion surrounding the lower side of the backlight unit where the light-incident portion of the light guide plate is located;
A side portion surrounding the left and right sides of the backlight unit; And
And an upper portion surrounding the upper side of the backlight unit. The liquid crystal display of claim 10, wherein the upper and side portions of the guide panel are attached and fixed on the bottom of the lower cover through an adhesive means. The liquid crystal display of claim 10, wherein a center portion of the lower portion of the guide panel is removed by a predetermined length, and both side portions are divided.

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